1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/classLoaderData.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/codeCache.hpp"
33 #include "code/dependencies.hpp"
34 #include "gc/shared/cardTableModRefBS.hpp"
35 #include "gc/shared/collectedHeap.inline.hpp"
36 #include "gc/shared/gcLocker.inline.hpp"
37 #include "gc/shared/genCollectedHeap.hpp"
38 #include "gc/shared/genRemSet.hpp"
39 #include "gc/shared/generation.hpp"
40 #include "gc/shared/space.hpp"
41 #include "interpreter/interpreter.hpp"
42 #include "memory/filemap.hpp"
43 #include "memory/metadataFactory.hpp"
44 #include "memory/metaspaceShared.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/universe.hpp"
47 #include "memory/universe.inline.hpp"
48 #include "oops/constantPool.hpp"
49 #include "oops/instanceClassLoaderKlass.hpp"
50 #include "oops/instanceKlass.hpp"
51 #include "oops/instanceMirrorKlass.hpp"
52 #include "oops/instanceRefKlass.hpp"
53 #include "oops/objArrayOop.inline.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "oops/typeArrayKlass.hpp"
56 #include "prims/jvmtiRedefineClassesTrace.hpp"
57 #include "runtime/arguments.hpp"
58 #include "runtime/atomic.inline.hpp"
59 #include "runtime/deoptimization.hpp"
60 #include "runtime/fprofiler.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/init.hpp"
63 #include "runtime/java.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/sharedRuntime.hpp"
66 #include "runtime/synchronizer.hpp"
67 #include "runtime/thread.inline.hpp"
68 #include "runtime/timer.hpp"
69 #include "runtime/vm_operations.hpp"
70 #include "services/memoryService.hpp"
71 #include "utilities/copy.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/hashtable.inline.hpp"
74 #include "utilities/macros.hpp"
75 #include "utilities/preserveException.hpp"
76 #if INCLUDE_ALL_GCS
77 #include "gc/cms/cmsCollectorPolicy.hpp"
78 #include "gc/g1/g1CollectedHeap.inline.hpp"
79 #include "gc/g1/g1CollectorPolicy_ext.hpp"
80 #include "gc/parallel/parallelScavengeHeap.hpp"
81 #include "gc/shared/adaptiveSizePolicy.hpp"
82 #endif // INCLUDE_ALL_GCS
83 #if INCLUDE_CDS
84 #include "classfile/sharedClassUtil.hpp"
85 #endif
86
87 // Known objects
88 Klass* Universe::_boolArrayKlassObj = NULL;
89 Klass* Universe::_byteArrayKlassObj = NULL;
90 Klass* Universe::_charArrayKlassObj = NULL;
91 Klass* Universe::_intArrayKlassObj = NULL;
92 Klass* Universe::_shortArrayKlassObj = NULL;
93 Klass* Universe::_longArrayKlassObj = NULL;
94 Klass* Universe::_singleArrayKlassObj = NULL;
95 Klass* Universe::_doubleArrayKlassObj = NULL;
96 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
97 Klass* Universe::_objectArrayKlassObj = NULL;
98 oop Universe::_int_mirror = NULL;
99 oop Universe::_float_mirror = NULL;
100 oop Universe::_double_mirror = NULL;
101 oop Universe::_byte_mirror = NULL;
102 oop Universe::_bool_mirror = NULL;
103 oop Universe::_char_mirror = NULL;
104 oop Universe::_long_mirror = NULL;
105 oop Universe::_short_mirror = NULL;
106 oop Universe::_void_mirror = NULL;
107 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
108 oop Universe::_main_thread_group = NULL;
109 oop Universe::_system_thread_group = NULL;
110 objArrayOop Universe::_the_empty_class_klass_array = NULL;
111 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
112 oop Universe::_the_null_string = NULL;
113 oop Universe::_the_min_jint_string = NULL;
114 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
115 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
116 LatestMethodCache* Universe::_pd_implies_cache = NULL;
117 LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
118 oop Universe::_out_of_memory_error_java_heap = NULL;
119 oop Universe::_out_of_memory_error_metaspace = NULL;
120 oop Universe::_out_of_memory_error_class_metaspace = NULL;
121 oop Universe::_out_of_memory_error_array_size = NULL;
122 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
123 oop Universe::_out_of_memory_error_realloc_objects = NULL;
124 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
125 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
126 bool Universe::_verify_in_progress = false;
127 oop Universe::_null_ptr_exception_instance = NULL;
128 oop Universe::_arithmetic_exception_instance = NULL;
129 oop Universe::_virtual_machine_error_instance = NULL;
130 oop Universe::_vm_exception = NULL;
131 oop Universe::_allocation_context_notification_obj = NULL;
132
133 Array<int>* Universe::_the_empty_int_array = NULL;
134 Array<u2>* Universe::_the_empty_short_array = NULL;
135 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
136 Array<Method*>* Universe::_the_empty_method_array = NULL;
137
138 // These variables are guarded by FullGCALot_lock.
139 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
140 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
141
142 // Heap
143 int Universe::_verify_count = 0;
144
145 int Universe::_base_vtable_size = 0;
146 bool Universe::_bootstrapping = false;
147 bool Universe::_fully_initialized = false;
148
149 size_t Universe::_heap_capacity_at_last_gc;
150 size_t Universe::_heap_used_at_last_gc = 0;
151
152 CollectedHeap* Universe::_collectedHeap = NULL;
153
154 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
155 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
156 address Universe::_narrow_ptrs_base;
157
158 void Universe::basic_type_classes_do(void f(Klass*)) {
159 f(boolArrayKlassObj());
160 f(byteArrayKlassObj());
161 f(charArrayKlassObj());
162 f(intArrayKlassObj());
163 f(shortArrayKlassObj());
164 f(longArrayKlassObj());
165 f(singleArrayKlassObj());
166 f(doubleArrayKlassObj());
167 }
168
169 void Universe::oops_do(OopClosure* f, bool do_all) {
170
171 f->do_oop((oop*) &_int_mirror);
172 f->do_oop((oop*) &_float_mirror);
173 f->do_oop((oop*) &_double_mirror);
174 f->do_oop((oop*) &_byte_mirror);
175 f->do_oop((oop*) &_bool_mirror);
176 f->do_oop((oop*) &_char_mirror);
177 f->do_oop((oop*) &_long_mirror);
178 f->do_oop((oop*) &_short_mirror);
179 f->do_oop((oop*) &_void_mirror);
180
181 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
182 f->do_oop((oop*) &_mirrors[i]);
183 }
184 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
185
186 f->do_oop((oop*)&_the_empty_class_klass_array);
187 f->do_oop((oop*)&_the_null_string);
188 f->do_oop((oop*)&_the_min_jint_string);
189 f->do_oop((oop*)&_out_of_memory_error_java_heap);
190 f->do_oop((oop*)&_out_of_memory_error_metaspace);
191 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
192 f->do_oop((oop*)&_out_of_memory_error_array_size);
193 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
194 f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
195 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
196 f->do_oop((oop*)&_null_ptr_exception_instance);
197 f->do_oop((oop*)&_arithmetic_exception_instance);
198 f->do_oop((oop*)&_virtual_machine_error_instance);
199 f->do_oop((oop*)&_main_thread_group);
200 f->do_oop((oop*)&_system_thread_group);
201 f->do_oop((oop*)&_vm_exception);
202 f->do_oop((oop*)&_allocation_context_notification_obj);
203 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
204 }
205
206 // Serialize metadata in and out of CDS archive, not oops.
207 void Universe::serialize(SerializeClosure* f, bool do_all) {
208
209 f->do_ptr((void**)&_boolArrayKlassObj);
210 f->do_ptr((void**)&_byteArrayKlassObj);
211 f->do_ptr((void**)&_charArrayKlassObj);
212 f->do_ptr((void**)&_intArrayKlassObj);
213 f->do_ptr((void**)&_shortArrayKlassObj);
214 f->do_ptr((void**)&_longArrayKlassObj);
215 f->do_ptr((void**)&_singleArrayKlassObj);
216 f->do_ptr((void**)&_doubleArrayKlassObj);
217 f->do_ptr((void**)&_objectArrayKlassObj);
218
219 {
220 for (int i = 0; i < T_VOID+1; i++) {
221 if (_typeArrayKlassObjs[i] != NULL) {
222 assert(i >= T_BOOLEAN, "checking");
223 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
224 } else if (do_all) {
225 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
226 }
227 }
228 }
229
230 f->do_ptr((void**)&_the_array_interfaces_array);
231 f->do_ptr((void**)&_the_empty_int_array);
232 f->do_ptr((void**)&_the_empty_short_array);
233 f->do_ptr((void**)&_the_empty_method_array);
234 f->do_ptr((void**)&_the_empty_klass_array);
235 _finalizer_register_cache->serialize(f);
236 _loader_addClass_cache->serialize(f);
237 _pd_implies_cache->serialize(f);
238 _throw_illegal_access_error_cache->serialize(f);
239 }
240
241 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
242 if (size < alignment || size % alignment != 0) {
243 vm_exit_during_initialization(
244 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
245 }
246 }
247
248 void initialize_basic_type_klass(Klass* k, TRAPS) {
249 Klass* ok = SystemDictionary::Object_klass();
250 if (UseSharedSpaces) {
251 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
252 assert(k->super() == ok, "u3");
253 k->restore_unshareable_info(loader_data, Handle(), CHECK);
254 } else {
255 k->initialize_supers(ok, CHECK);
256 }
257 k->append_to_sibling_list();
258 }
259
260 void Universe::genesis(TRAPS) {
261 ResourceMark rm;
262
263 { FlagSetting fs(_bootstrapping, true);
264
265 { MutexLocker mc(Compile_lock);
266
267 // determine base vtable size; without that we cannot create the array klasses
268 compute_base_vtable_size();
269
270 if (!UseSharedSpaces) {
271 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
272 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
273 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
274 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
275 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
276 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
277 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
278 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
279
280 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
281 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
282 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
283 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
284 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
285 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
286 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
287 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
288
289 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
290
291 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
292 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
293 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
294 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
295 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
296 }
297 }
298
299 vmSymbols::initialize(CHECK);
300
301 SystemDictionary::initialize(CHECK);
302
303 Klass* ok = SystemDictionary::Object_klass();
304
305 _the_null_string = StringTable::intern("null", CHECK);
306 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
307
308 if (UseSharedSpaces) {
309 // Verify shared interfaces array.
310 assert(_the_array_interfaces_array->at(0) ==
311 SystemDictionary::Cloneable_klass(), "u3");
312 assert(_the_array_interfaces_array->at(1) ==
313 SystemDictionary::Serializable_klass(), "u3");
314 } else {
315 // Set up shared interfaces array. (Do this before supers are set up.)
316 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
317 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
318 }
319
320 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
321 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
322 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
323 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
324 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
325 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
326 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
327 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
328 } // end of core bootstrapping
329
330 // Maybe this could be lifted up now that object array can be initialized
331 // during the bootstrapping.
332
333 // OLD
334 // Initialize _objectArrayKlass after core bootstraping to make
335 // sure the super class is set up properly for _objectArrayKlass.
336 // ---
337 // NEW
338 // Since some of the old system object arrays have been converted to
339 // ordinary object arrays, _objectArrayKlass will be loaded when
340 // SystemDictionary::initialize(CHECK); is run. See the extra check
341 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
342 _objectArrayKlassObj = InstanceKlass::
343 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
344 // OLD
345 // Add the class to the class hierarchy manually to make sure that
346 // its vtable is initialized after core bootstrapping is completed.
347 // ---
348 // New
349 // Have already been initialized.
350 _objectArrayKlassObj->append_to_sibling_list();
351
352 // Compute is_jdk version flags.
353 // Only 1.3 or later has the java.lang.Shutdown class.
354 // Only 1.4 or later has the java.lang.CharSequence interface.
355 // Only 1.5 or later has the java.lang.management.MemoryUsage class.
356 if (JDK_Version::is_partially_initialized()) {
357 uint8_t jdk_version;
358 Klass* k = SystemDictionary::resolve_or_null(
359 vmSymbols::java_lang_management_MemoryUsage(), THREAD);
360 CLEAR_PENDING_EXCEPTION; // ignore exceptions
361 if (k == NULL) {
362 k = SystemDictionary::resolve_or_null(
363 vmSymbols::java_lang_CharSequence(), THREAD);
364 CLEAR_PENDING_EXCEPTION; // ignore exceptions
365 if (k == NULL) {
366 k = SystemDictionary::resolve_or_null(
367 vmSymbols::java_lang_Shutdown(), THREAD);
368 CLEAR_PENDING_EXCEPTION; // ignore exceptions
369 if (k == NULL) {
370 jdk_version = 2;
371 } else {
372 jdk_version = 3;
373 }
374 } else {
375 jdk_version = 4;
376 }
377 } else {
378 jdk_version = 5;
379 }
380 JDK_Version::fully_initialize(jdk_version);
381 }
382
383 #ifdef ASSERT
384 if (FullGCALot) {
385 // Allocate an array of dummy objects.
386 // We'd like these to be at the bottom of the old generation,
387 // so that when we free one and then collect,
388 // (almost) the whole heap moves
389 // and we find out if we actually update all the oops correctly.
390 // But we can't allocate directly in the old generation,
391 // so we allocate wherever, and hope that the first collection
392 // moves these objects to the bottom of the old generation.
393 // We can allocate directly in the permanent generation, so we do.
394 int size;
395 if (UseConcMarkSweepGC) {
396 warning("Using +FullGCALot with concurrent mark sweep gc "
397 "will not force all objects to relocate");
398 size = FullGCALotDummies;
399 } else {
400 size = FullGCALotDummies * 2;
401 }
402 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
403 objArrayHandle dummy_array(THREAD, naked_array);
404 int i = 0;
405 while (i < size) {
406 // Allocate dummy in old generation
407 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK);
408 dummy_array->obj_at_put(i++, dummy);
409 }
410 {
411 // Only modify the global variable inside the mutex.
412 // If we had a race to here, the other dummy_array instances
413 // and their elements just get dropped on the floor, which is fine.
414 MutexLocker ml(FullGCALot_lock);
415 if (_fullgc_alot_dummy_array == NULL) {
416 _fullgc_alot_dummy_array = dummy_array();
417 }
418 }
419 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
420 }
421 #endif
422
423 // Initialize dependency array for null class loader
424 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
425
426 }
427
428 // CDS support for patching vtables in metadata in the shared archive.
429 // All types inherited from Metadata have vtables, but not types inherited
430 // from MetaspaceObj, because the latter does not have virtual functions.
431 // If the metadata type has a vtable, it cannot be shared in the read-only
432 // section of the CDS archive, because the vtable pointer is patched.
433 static inline void add_vtable(void** list, int* n, void* o, int count) {
434 guarantee((*n) < count, "vtable list too small");
435 void* vtable = dereference_vptr(o);
436 assert(*(void**)(vtable) != NULL, "invalid vtable");
437 list[(*n)++] = vtable;
438 }
439
440 void Universe::init_self_patching_vtbl_list(void** list, int count) {
441 int n = 0;
442 { InstanceKlass o; add_vtable(list, &n, &o, count); }
443 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); }
444 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); }
445 { InstanceRefKlass o; add_vtable(list, &n, &o, count); }
446 { TypeArrayKlass o; add_vtable(list, &n, &o, count); }
447 { ObjArrayKlass o; add_vtable(list, &n, &o, count); }
448 { Method o; add_vtable(list, &n, &o, count); }
449 { ConstantPool o; add_vtable(list, &n, &o, count); }
450 }
451
452 void Universe::initialize_basic_type_mirrors(TRAPS) {
453 assert(_int_mirror==NULL, "basic type mirrors already initialized");
454 _int_mirror =
455 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
456 _float_mirror =
457 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
458 _double_mirror =
459 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
460 _byte_mirror =
461 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
462 _bool_mirror =
463 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
464 _char_mirror =
465 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
466 _long_mirror =
467 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
468 _short_mirror =
469 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
470 _void_mirror =
471 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
472
473 _mirrors[T_INT] = _int_mirror;
474 _mirrors[T_FLOAT] = _float_mirror;
475 _mirrors[T_DOUBLE] = _double_mirror;
476 _mirrors[T_BYTE] = _byte_mirror;
477 _mirrors[T_BOOLEAN] = _bool_mirror;
478 _mirrors[T_CHAR] = _char_mirror;
479 _mirrors[T_LONG] = _long_mirror;
480 _mirrors[T_SHORT] = _short_mirror;
481 _mirrors[T_VOID] = _void_mirror;
482 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror();
483 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror();
484 }
485
486 void Universe::fixup_mirrors(TRAPS) {
487 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
488 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
489 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
490 // that the number of objects allocated at this point is very small.
491 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
492 HandleMark hm(THREAD);
493 // Cache the start of the static fields
494 InstanceMirrorKlass::init_offset_of_static_fields();
495
496 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
497 int list_length = list->length();
498 for (int i = 0; i < list_length; i++) {
499 Klass* k = list->at(i);
500 assert(k->is_klass(), "List should only hold classes");
501 EXCEPTION_MARK;
502 KlassHandle kh(THREAD, k);
503 java_lang_Class::fixup_mirror(kh, CATCH);
504 }
505 delete java_lang_Class::fixup_mirror_list();
506 java_lang_Class::set_fixup_mirror_list(NULL);
507 }
508
509 static bool has_run_finalizers_on_exit = false;
510
511 void Universe::run_finalizers_on_exit() {
512 if (has_run_finalizers_on_exit) return;
513 has_run_finalizers_on_exit = true;
514
515 // Called on VM exit. This ought to be run in a separate thread.
516 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit");
517 {
518 PRESERVE_EXCEPTION_MARK;
519 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass());
520 JavaValue result(T_VOID);
521 JavaCalls::call_static(
522 &result,
523 finalizer_klass,
524 vmSymbols::run_finalizers_on_exit_name(),
525 vmSymbols::void_method_signature(),
526 THREAD
527 );
528 // Ignore any pending exceptions
529 CLEAR_PENDING_EXCEPTION;
530 }
531 }
532
533
534 // initialize_vtable could cause gc if
535 // 1) we specified true to initialize_vtable and
536 // 2) this ran after gc was enabled
537 // In case those ever change we use handles for oops
538 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) {
539 // init vtable of k and all subclasses
540 Klass* ko = k_h();
541 klassVtable* vt = ko->vtable();
542 if (vt) vt->initialize_vtable(false, CHECK);
543 if (ko->oop_is_instance()) {
544 InstanceKlass* ik = (InstanceKlass*)ko;
545 for (KlassHandle s_h(THREAD, ik->subklass());
546 s_h() != NULL;
547 s_h = KlassHandle(THREAD, s_h()->next_sibling())) {
548 reinitialize_vtable_of(s_h, CHECK);
549 }
550 }
551 }
552
553
554 void initialize_itable_for_klass(Klass* k, TRAPS) {
555 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK);
556 }
557
558
559 void Universe::reinitialize_itables(TRAPS) {
560 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK);
561
562 }
563
564
565 bool Universe::on_page_boundary(void* addr) {
566 return ((uintptr_t) addr) % os::vm_page_size() == 0;
567 }
568
569
570 bool Universe::should_fill_in_stack_trace(Handle throwable) {
571 // never attempt to fill in the stack trace of preallocated errors that do not have
572 // backtrace. These errors are kept alive forever and may be "re-used" when all
573 // preallocated errors with backtrace have been consumed. Also need to avoid
574 // a potential loop which could happen if an out of memory occurs when attempting
575 // to allocate the backtrace.
576 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
577 (throwable() != Universe::_out_of_memory_error_metaspace) &&
578 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
579 (throwable() != Universe::_out_of_memory_error_array_size) &&
580 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
581 (throwable() != Universe::_out_of_memory_error_realloc_objects));
582 }
583
584
585 oop Universe::gen_out_of_memory_error(oop default_err) {
586 // generate an out of memory error:
587 // - if there is a preallocated error with backtrace available then return it wth
588 // a filled in stack trace.
589 // - if there are no preallocated errors with backtrace available then return
590 // an error without backtrace.
591 int next;
592 if (_preallocated_out_of_memory_error_avail_count > 0) {
593 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
594 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
595 } else {
596 next = -1;
597 }
598 if (next < 0) {
599 // all preallocated errors have been used.
600 // return default
601 return default_err;
602 } else {
603 // get the error object at the slot and set set it to NULL so that the
604 // array isn't keeping it alive anymore.
605 oop exc = preallocated_out_of_memory_errors()->obj_at(next);
606 assert(exc != NULL, "slot has been used already");
607 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
608
609 // use the message from the default error
610 oop msg = java_lang_Throwable::message(default_err);
611 assert(msg != NULL, "no message");
612 java_lang_Throwable::set_message(exc, msg);
613
614 // populate the stack trace and return it.
615 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
616 return exc;
617 }
618 }
619
620 intptr_t Universe::_non_oop_bits = 0;
621
622 void* Universe::non_oop_word() {
623 // Neither the high bits nor the low bits of this value is allowed
624 // to look like (respectively) the high or low bits of a real oop.
625 //
626 // High and low are CPU-specific notions, but low always includes
627 // the low-order bit. Since oops are always aligned at least mod 4,
628 // setting the low-order bit will ensure that the low half of the
629 // word will never look like that of a real oop.
630 //
631 // Using the OS-supplied non-memory-address word (usually 0 or -1)
632 // will take care of the high bits, however many there are.
633
634 if (_non_oop_bits == 0) {
635 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
636 }
637
638 return (void*)_non_oop_bits;
639 }
640
641 jint universe_init() {
642 assert(!Universe::_fully_initialized, "called after initialize_vtables");
643 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
644 "LogHeapWordSize is incorrect.");
645 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
646 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
647 "oop size is not not a multiple of HeapWord size");
648 TraceTime timer("Genesis", TraceStartupTime);
649 JavaClasses::compute_hard_coded_offsets();
650
651 jint status = Universe::initialize_heap();
652 if (status != JNI_OK) {
653 return status;
654 }
655
656 Metaspace::global_initialize();
657
658 // Create memory for metadata. Must be after initializing heap for
659 // DumpSharedSpaces.
660 ClassLoaderData::init_null_class_loader_data();
661
662 // We have a heap so create the Method* caches before
663 // Metaspace::initialize_shared_spaces() tries to populate them.
664 Universe::_finalizer_register_cache = new LatestMethodCache();
665 Universe::_loader_addClass_cache = new LatestMethodCache();
666 Universe::_pd_implies_cache = new LatestMethodCache();
667 Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
668
669 if (UseSharedSpaces) {
670 // Read the data structures supporting the shared spaces (shared
671 // system dictionary, symbol table, etc.). After that, access to
672 // the file (other than the mapped regions) is no longer needed, and
673 // the file is closed. Closing the file does not affect the
674 // currently mapped regions.
675 MetaspaceShared::initialize_shared_spaces();
676 StringTable::create_table();
677 } else {
678 SymbolTable::create_table();
679 StringTable::create_table();
680 ClassLoader::create_package_info_table();
681
682 if (DumpSharedSpaces) {
683 MetaspaceShared::prepare_for_dumping();
684 }
685 }
686
687 return JNI_OK;
688 }
689
690 template <class Heap, class Policy>
691 jint Universe::create_heap() {
692 assert(_collectedHeap == NULL, "Heap already created");
693 Policy* policy = new Policy();
694 policy->initialize_all();
695 _collectedHeap = new Heap(policy);
696 return _collectedHeap->initialize();
697 }
698
699 // Choose the heap base address and oop encoding mode
700 // when compressed oops are used:
701 // Unscaled - Use 32-bits oops without encoding when
702 // NarrowOopHeapBaseMin + heap_size < 4Gb
703 // ZeroBased - Use zero based compressed oops with encoding when
704 // NarrowOopHeapBaseMin + heap_size < 32Gb
705 // HeapBased - Use compressed oops with heap base + encoding.
706
707 jint Universe::initialize_heap() {
708 jint status = JNI_ERR;
709
710 #if !INCLUDE_ALL_GCS
711 if (UseParallelGC) {
712 fatal("UseParallelGC not supported in this VM.");
713 } else if (UseG1GC) {
714 fatal("UseG1GC not supported in this VM.");
715 } else if (UseConcMarkSweepGC) {
716 fatal("UseConcMarkSweepGC not supported in this VM.");
717 #else
718 if (UseParallelGC) {
719 status = Universe::create_heap<ParallelScavengeHeap, GenerationSizer>();
720 } else if (UseG1GC) {
721 status = Universe::create_heap<G1CollectedHeap, G1CollectorPolicyExt>();
722 } else if (UseConcMarkSweepGC) {
723 status = Universe::create_heap<GenCollectedHeap, ConcurrentMarkSweepPolicy>();
724 #endif
725 } else if (UseSerialGC) {
726 status = Universe::create_heap<GenCollectedHeap, MarkSweepPolicy>();
727 } else {
728 ShouldNotReachHere();
729 }
730
731 if (status != JNI_OK) {
732 return status;
733 }
734
735 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
736
737 #ifdef _LP64
738 if (UseCompressedOops) {
739 // Subtract a page because something can get allocated at heap base.
740 // This also makes implicit null checking work, because the
741 // memory+1 page below heap_base needs to cause a signal.
742 // See needs_explicit_null_check.
743 // Only set the heap base for compressed oops because it indicates
744 // compressed oops for pstack code.
745 if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
746 // Didn't reserve heap below 4Gb. Must shift.
747 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
748 }
749 if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
750 // Did reserve heap below 32Gb. Can use base == 0;
751 Universe::set_narrow_oop_base(0);
752 }
753
754 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
755
756 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
757 Universe::print_compressed_oops_mode();
758 }
759
760 // Tell tests in which mode we run.
761 Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
762 narrow_oop_mode_to_string(narrow_oop_mode()),
763 false));
764 }
765 // Universe::narrow_oop_base() is one page below the heap.
766 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
767 os::vm_page_size()) ||
768 Universe::narrow_oop_base() == NULL, "invalid value");
769 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
770 Universe::narrow_oop_shift() == 0, "invalid value");
771 #endif
772
773 // We will never reach the CATCH below since Exceptions::_throw will cause
774 // the VM to exit if an exception is thrown during initialization
775
776 if (UseTLAB) {
777 assert(Universe::heap()->supports_tlab_allocation(),
778 "Should support thread-local allocation buffers");
779 ThreadLocalAllocBuffer::startup_initialization();
780 }
781 return JNI_OK;
782 }
783
784 void Universe::print_compressed_oops_mode() {
785 tty->cr();
786 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
787 p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
788
789 tty->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
790
791 if (Universe::narrow_oop_base() != 0) {
792 tty->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
793 }
794
795 if (Universe::narrow_oop_shift() != 0) {
796 tty->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
797 }
798
799 if (!Universe::narrow_oop_use_implicit_null_checks()) {
800 tty->print(", no protected page in front of the heap");
801 }
802
803 tty->cr();
804 tty->cr();
805 }
806
807 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
808
809 assert(alignment <= Arguments::conservative_max_heap_alignment(),
810 err_msg("actual alignment "SIZE_FORMAT" must be within maximum heap alignment "SIZE_FORMAT,
811 alignment, Arguments::conservative_max_heap_alignment()));
812
813 size_t total_reserved = align_size_up(heap_size, alignment);
814 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
815 "heap size is too big for compressed oops");
816
817 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
818 assert(!UseLargePages
819 || UseParallelGC
820 || use_large_pages, "Wrong alignment to use large pages");
821
822 // Now create the space.
823 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
824
825 if (total_rs.is_reserved()) {
826 assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
827 "must be exactly of required size and alignment");
828 // We are good.
829
830 if (UseCompressedOops) {
831 // Universe::initialize_heap() will reset this to NULL if unscaled
832 // or zero-based narrow oops are actually used.
833 // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
834 Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
835 }
836
837 return total_rs;
838 }
839
840 vm_exit_during_initialization(
841 err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
842 total_reserved/K));
843
844 // satisfy compiler
845 ShouldNotReachHere();
846 return ReservedHeapSpace(0, 0, false);
847 }
848
849
850 // It's the caller's responsibility to ensure glitch-freedom
851 // (if required).
852 void Universe::update_heap_info_at_gc() {
853 _heap_capacity_at_last_gc = heap()->capacity();
854 _heap_used_at_last_gc = heap()->used();
855 }
856
857
858 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
859 switch (mode) {
860 case UnscaledNarrowOop:
861 return "32-bit";
862 case ZeroBasedNarrowOop:
863 return "Zero based";
864 case DisjointBaseNarrowOop:
865 return "Non-zero disjoint base";
866 case HeapBasedNarrowOop:
867 return "Non-zero based";
868 }
869
870 ShouldNotReachHere();
871 return "";
872 }
873
874
875 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
876 if (narrow_oop_base_disjoint()) {
877 return DisjointBaseNarrowOop;
878 }
879
880 if (narrow_oop_base() != 0) {
881 return HeapBasedNarrowOop;
882 }
883
884 if (narrow_oop_shift() != 0) {
885 return ZeroBasedNarrowOop;
886 }
887
888 return UnscaledNarrowOop;
889 }
890
891
892 void universe2_init() {
893 EXCEPTION_MARK;
894 Universe::genesis(CATCH);
895 }
896
897
898 bool universe_post_init() {
899 assert(!is_init_completed(), "Error: initialization not yet completed!");
900 Universe::_fully_initialized = true;
901 EXCEPTION_MARK;
902 { ResourceMark rm;
903 Interpreter::initialize(); // needed for interpreter entry points
904 if (!UseSharedSpaces) {
905 HandleMark hm(THREAD);
906 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass());
907 Universe::reinitialize_vtable_of(ok_h, CHECK_false);
908 Universe::reinitialize_itables(CHECK_false);
909 }
910 }
911
912 HandleMark hm(THREAD);
913 Klass* k;
914 instanceKlassHandle k_h;
915 // Setup preallocated empty java.lang.Class array
916 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
917
918 // Setup preallocated OutOfMemoryError errors
919 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
920 k_h = instanceKlassHandle(THREAD, k);
921 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false);
922 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false);
923 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false);
924 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false);
925 Universe::_out_of_memory_error_gc_overhead_limit =
926 k_h->allocate_instance(CHECK_false);
927 Universe::_out_of_memory_error_realloc_objects = k_h->allocate_instance(CHECK_false);
928
929 // Setup preallocated NullPointerException
930 // (this is currently used for a cheap & dirty solution in compiler exception handling)
931 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
932 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
933 // Setup preallocated ArithmeticException
934 // (this is currently used for a cheap & dirty solution in compiler exception handling)
935 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
936 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
937 // Virtual Machine Error for when we get into a situation we can't resolve
938 k = SystemDictionary::resolve_or_fail(
939 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
940 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
941 if (!linked) {
942 tty->print_cr("Unable to link/verify VirtualMachineError class");
943 return false; // initialization failed
944 }
945 Universe::_virtual_machine_error_instance =
946 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
947
948 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
949
950 if (!DumpSharedSpaces) {
951 // These are the only Java fields that are currently set during shared space dumping.
952 // We prefer to not handle this generally, so we always reinitialize these detail messages.
953 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
954 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
955
956 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
957 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
958 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
959 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
960
961 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
962 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
963
964 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
965 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
966
967 msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
968 java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
969
970 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
971 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
972
973 // Setup the array of errors that have preallocated backtrace
974 k = Universe::_out_of_memory_error_java_heap->klass();
975 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
976 k_h = instanceKlassHandle(THREAD, k);
977
978 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
979 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false);
980 for (int i=0; i<len; i++) {
981 oop err = k_h->allocate_instance(CHECK_false);
982 Handle err_h = Handle(THREAD, err);
983 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
984 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
985 }
986 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
987 }
988
989
990 // Setup static method for registering finalizers
991 // The finalizer klass must be linked before looking up the method, in
992 // case it needs to get rewritten.
993 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false);
994 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method(
995 vmSymbols::register_method_name(),
996 vmSymbols::register_method_signature());
997 if (m == NULL || !m->is_static()) {
998 tty->print_cr("Unable to link/verify Finalizer.register method");
999 return false; // initialization failed (cannot throw exception yet)
1000 }
1001 Universe::_finalizer_register_cache->init(
1002 SystemDictionary::Finalizer_klass(), m);
1003
1004 InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->link_class(CHECK_false);
1005 m = InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->find_method(
1006 vmSymbols::throwIllegalAccessError_name(),
1007 vmSymbols::void_method_signature());
1008 if (m != NULL && !m->is_static()) {
1009 // Note null is okay; this method is used in itables, and if it is null,
1010 // then AbstractMethodError is thrown instead.
1011 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method");
1012 return false; // initialization failed (cannot throw exception yet)
1013 }
1014 Universe::_throw_illegal_access_error_cache->init(
1015 SystemDictionary::misc_Unsafe_klass(), m);
1016
1017 // Setup method for registering loaded classes in class loader vector
1018 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false);
1019 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature());
1020 if (m == NULL || m->is_static()) {
1021 tty->print_cr("Unable to link/verify ClassLoader.addClass method");
1022 return false; // initialization failed (cannot throw exception yet)
1023 }
1024 Universe::_loader_addClass_cache->init(
1025 SystemDictionary::ClassLoader_klass(), m);
1026
1027 // Setup method for checking protection domain
1028 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false);
1029 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->
1030 find_method(vmSymbols::impliesCreateAccessControlContext_name(),
1031 vmSymbols::void_boolean_signature());
1032 // Allow NULL which should only happen with bootstrapping.
1033 if (m != NULL) {
1034 if (m->is_static()) {
1035 // NoSuchMethodException doesn't actually work because it tries to run the
1036 // <init> function before java_lang_Class is linked. Print error and exit.
1037 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage");
1038 return false; // initialization failed
1039 }
1040 Universe::_pd_implies_cache->init(
1041 SystemDictionary::ProtectionDomain_klass(), m);
1042 }
1043
1044 // This needs to be done before the first scavenge/gc, since
1045 // it's an input to soft ref clearing policy.
1046 {
1047 MutexLocker x(Heap_lock);
1048 Universe::update_heap_info_at_gc();
1049 }
1050
1051 // ("weak") refs processing infrastructure initialization
1052 Universe::heap()->post_initialize();
1053
1054 // Initialize performance counters for metaspaces
1055 MetaspaceCounters::initialize_performance_counters();
1056 CompressedClassSpaceCounters::initialize_performance_counters();
1057
1058 MemoryService::add_metaspace_memory_pools();
1059
1060 MemoryService::set_universe_heap(Universe::heap());
1061 #if INCLUDE_CDS
1062 SharedClassUtil::initialize(CHECK_false);
1063 #endif
1064 return true;
1065 }
1066
1067
1068 void Universe::compute_base_vtable_size() {
1069 _base_vtable_size = ClassLoader::compute_Object_vtable();
1070 }
1071
1072
1073 void Universe::print() {
1074 print_on(gclog_or_tty);
1075 }
1076
1077 void Universe::print_on(outputStream* st, bool extended) {
1078 st->print_cr("Heap");
1079 if (!extended) {
1080 heap()->print_on(st);
1081 } else {
1082 heap()->print_extended_on(st);
1083 }
1084 }
1085
1086 void Universe::print_heap_at_SIGBREAK() {
1087 if (PrintHeapAtSIGBREAK) {
1088 MutexLocker hl(Heap_lock);
1089 print_on(tty);
1090 tty->cr();
1091 tty->flush();
1092 }
1093 }
1094
1095 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) {
1096 st->print_cr("{Heap before GC invocations=%u (full %u):",
1097 heap()->total_collections(),
1098 heap()->total_full_collections());
1099 if (!PrintHeapAtGCExtended || ignore_extended) {
1100 heap()->print_on(st);
1101 } else {
1102 heap()->print_extended_on(st);
1103 }
1104 }
1105
1106 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) {
1107 st->print_cr("Heap after GC invocations=%u (full %u):",
1108 heap()->total_collections(),
1109 heap()->total_full_collections());
1110 if (!PrintHeapAtGCExtended || ignore_extended) {
1111 heap()->print_on(st);
1112 } else {
1113 heap()->print_extended_on(st);
1114 }
1115 st->print_cr("}");
1116 }
1117
1118 void Universe::verify(VerifyOption option, const char* prefix, bool silent) {
1119 // The use of _verify_in_progress is a temporary work around for
1120 // 6320749. Don't bother with a creating a class to set and clear
1121 // it since it is only used in this method and the control flow is
1122 // straight forward.
1123 _verify_in_progress = true;
1124
1125 COMPILER2_PRESENT(
1126 assert(!DerivedPointerTable::is_active(),
1127 "DPT should not be active during verification "
1128 "(of thread stacks below)");
1129 )
1130
1131 ResourceMark rm;
1132 HandleMark hm; // Handles created during verification can be zapped
1133 _verify_count++;
1134
1135 if (!silent) gclog_or_tty->print("%s", prefix);
1136 if (!silent) gclog_or_tty->print("[Verifying ");
1137 if (!silent) gclog_or_tty->print("threads ");
1138 Threads::verify();
1139 if (!silent) gclog_or_tty->print("heap ");
1140 heap()->verify(silent, option);
1141 if (!silent) gclog_or_tty->print("syms ");
1142 SymbolTable::verify();
1143 if (!silent) gclog_or_tty->print("strs ");
1144 StringTable::verify();
1145 {
1146 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1147 if (!silent) gclog_or_tty->print("zone ");
1148 CodeCache::verify();
1149 }
1150 if (!silent) gclog_or_tty->print("dict ");
1151 SystemDictionary::verify();
1152 #ifndef PRODUCT
1153 if (!silent) gclog_or_tty->print("cldg ");
1154 ClassLoaderDataGraph::verify();
1155 #endif
1156 if (!silent) gclog_or_tty->print("metaspace chunks ");
1157 MetaspaceAux::verify_free_chunks();
1158 if (!silent) gclog_or_tty->print("hand ");
1159 JNIHandles::verify();
1160 if (!silent) gclog_or_tty->print("C-heap ");
1161 os::check_heap();
1162 if (!silent) gclog_or_tty->print("code cache ");
1163 CodeCache::verify_oops();
1164 if (!silent) gclog_or_tty->print_cr("]");
1165
1166 _verify_in_progress = false;
1167 }
1168
1169 // Oop verification (see MacroAssembler::verify_oop)
1170
1171 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1};
1172 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1};
1173
1174
1175 #ifndef PRODUCT
1176
1177 static void calculate_verify_data(uintptr_t verify_data[2],
1178 HeapWord* low_boundary,
1179 HeapWord* high_boundary) {
1180 assert(low_boundary < high_boundary, "bad interval");
1181
1182 // decide which low-order bits we require to be clear:
1183 size_t alignSize = MinObjAlignmentInBytes;
1184 size_t min_object_size = CollectedHeap::min_fill_size();
1185
1186 // make an inclusive limit:
1187 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1188 uintptr_t min = (uintptr_t)low_boundary;
1189 assert(min < max, "bad interval");
1190 uintptr_t diff = max ^ min;
1191
1192 // throw away enough low-order bits to make the diff vanish
1193 uintptr_t mask = (uintptr_t)(-1);
1194 while ((mask & diff) != 0)
1195 mask <<= 1;
1196 uintptr_t bits = (min & mask);
1197 assert(bits == (max & mask), "correct mask");
1198 // check an intermediate value between min and max, just to make sure:
1199 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1200
1201 // require address alignment, too:
1202 mask |= (alignSize - 1);
1203
1204 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) {
1205 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability");
1206 }
1207 verify_data[0] = mask;
1208 verify_data[1] = bits;
1209 }
1210
1211 // Oop verification (see MacroAssembler::verify_oop)
1212
1213 uintptr_t Universe::verify_oop_mask() {
1214 MemRegion m = heap()->reserved_region();
1215 calculate_verify_data(_verify_oop_data,
1216 m.start(),
1217 m.end());
1218 return _verify_oop_data[0];
1219 }
1220
1221
1222
1223 uintptr_t Universe::verify_oop_bits() {
1224 verify_oop_mask();
1225 return _verify_oop_data[1];
1226 }
1227
1228 uintptr_t Universe::verify_mark_mask() {
1229 return markOopDesc::lock_mask_in_place;
1230 }
1231
1232 uintptr_t Universe::verify_mark_bits() {
1233 intptr_t mask = verify_mark_mask();
1234 intptr_t bits = (intptr_t)markOopDesc::prototype();
1235 assert((bits & ~mask) == 0, "no stray header bits");
1236 return bits;
1237 }
1238 #endif // PRODUCT
1239
1240
1241 void Universe::compute_verify_oop_data() {
1242 verify_oop_mask();
1243 verify_oop_bits();
1244 verify_mark_mask();
1245 verify_mark_bits();
1246 }
1247
1248
1249 void LatestMethodCache::init(Klass* k, Method* m) {
1250 if (!UseSharedSpaces) {
1251 _klass = k;
1252 }
1253 #ifndef PRODUCT
1254 else {
1255 // sharing initilization should have already set up _klass
1256 assert(_klass != NULL, "just checking");
1257 }
1258 #endif
1259
1260 _method_idnum = m->method_idnum();
1261 assert(_method_idnum >= 0, "sanity check");
1262 }
1263
1264
1265 Method* LatestMethodCache::get_method() {
1266 if (klass() == NULL) return NULL;
1267 InstanceKlass* ik = InstanceKlass::cast(klass());
1268 Method* m = ik->method_with_idnum(method_idnum());
1269 assert(m != NULL, "sanity check");
1270 return m;
1271 }
1272
1273
1274 #ifdef ASSERT
1275 // Release dummy object(s) at bottom of heap
1276 bool Universe::release_fullgc_alot_dummy() {
1277 MutexLocker ml(FullGCALot_lock);
1278 if (_fullgc_alot_dummy_array != NULL) {
1279 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1280 // No more dummies to release, release entire array instead
1281 _fullgc_alot_dummy_array = NULL;
1282 return false;
1283 }
1284 if (!UseConcMarkSweepGC) {
1285 // Release dummy at bottom of old generation
1286 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1287 }
1288 // Release dummy at bottom of permanent generation
1289 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1290 }
1291 return true;
1292 }
1293
1294 #endif // ASSERT