Thu, 13 Feb 2014 10:05:03 +0100
8028498: runtime/SharedArchiveFile/CdsDifferentObjectAlignment.java asserts in RT_Baseline
Summary: Preventing GCs to occur before VM is completely initialized. This was previously partly done by one part of the GC locker which not was removed.
Reviewed-by: coleenp, pliden
1 /*
2 * Copyright (c) 1997, 2013, 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 */
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/classLoaderData.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/symbolTable.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/gcLocker.inline.hpp"
38 #include "memory/genCollectedHeap.hpp"
39 #include "memory/genRemSet.hpp"
40 #include "memory/generation.hpp"
41 #include "memory/metadataFactory.hpp"
42 #include "memory/metaspaceShared.hpp"
43 #include "memory/oopFactory.hpp"
44 #include "memory/space.hpp"
45 #include "memory/universe.hpp"
46 #include "memory/universe.inline.hpp"
47 #include "oops/constantPool.hpp"
48 #include "oops/instanceClassLoaderKlass.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/instanceMirrorKlass.hpp"
51 #include "oops/instanceRefKlass.hpp"
52 #include "oops/oop.inline.hpp"
53 #include "oops/typeArrayKlass.hpp"
54 #include "prims/jvmtiRedefineClassesTrace.hpp"
55 #include "runtime/arguments.hpp"
56 #include "runtime/deoptimization.hpp"
57 #include "runtime/fprofiler.hpp"
58 #include "runtime/handles.inline.hpp"
59 #include "runtime/init.hpp"
60 #include "runtime/java.hpp"
61 #include "runtime/javaCalls.hpp"
62 #include "runtime/sharedRuntime.hpp"
63 #include "runtime/synchronizer.hpp"
64 #include "runtime/thread.inline.hpp"
65 #include "runtime/timer.hpp"
66 #include "runtime/vm_operations.hpp"
67 #include "services/memoryService.hpp"
68 #include "utilities/copy.hpp"
69 #include "utilities/events.hpp"
70 #include "utilities/hashtable.inline.hpp"
71 #include "utilities/preserveException.hpp"
72 #include "utilities/macros.hpp"
73 #if INCLUDE_ALL_GCS
74 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp"
75 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp"
76 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
77 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
78 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
79 #endif // INCLUDE_ALL_GCS
81 // Known objects
82 Klass* Universe::_boolArrayKlassObj = NULL;
83 Klass* Universe::_byteArrayKlassObj = NULL;
84 Klass* Universe::_charArrayKlassObj = NULL;
85 Klass* Universe::_intArrayKlassObj = NULL;
86 Klass* Universe::_shortArrayKlassObj = NULL;
87 Klass* Universe::_longArrayKlassObj = NULL;
88 Klass* Universe::_singleArrayKlassObj = NULL;
89 Klass* Universe::_doubleArrayKlassObj = NULL;
90 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
91 Klass* Universe::_objectArrayKlassObj = NULL;
92 oop Universe::_int_mirror = NULL;
93 oop Universe::_float_mirror = NULL;
94 oop Universe::_double_mirror = NULL;
95 oop Universe::_byte_mirror = NULL;
96 oop Universe::_bool_mirror = NULL;
97 oop Universe::_char_mirror = NULL;
98 oop Universe::_long_mirror = NULL;
99 oop Universe::_short_mirror = NULL;
100 oop Universe::_void_mirror = NULL;
101 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
102 oop Universe::_main_thread_group = NULL;
103 oop Universe::_system_thread_group = NULL;
104 objArrayOop Universe::_the_empty_class_klass_array = NULL;
105 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
106 oop Universe::_the_null_string = NULL;
107 oop Universe::_the_min_jint_string = NULL;
108 LatestMethodCache* Universe::_finalizer_register_cache = NULL;
109 LatestMethodCache* Universe::_loader_addClass_cache = NULL;
110 LatestMethodCache* Universe::_pd_implies_cache = NULL;
111 oop Universe::_out_of_memory_error_java_heap = NULL;
112 oop Universe::_out_of_memory_error_metaspace = NULL;
113 oop Universe::_out_of_memory_error_class_metaspace = NULL;
114 oop Universe::_out_of_memory_error_array_size = NULL;
115 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
116 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
117 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
118 bool Universe::_verify_in_progress = false;
119 oop Universe::_null_ptr_exception_instance = NULL;
120 oop Universe::_arithmetic_exception_instance = NULL;
121 oop Universe::_virtual_machine_error_instance = NULL;
122 oop Universe::_vm_exception = NULL;
123 Method* Universe::_throw_illegal_access_error = NULL;
124 Array<int>* Universe::_the_empty_int_array = NULL;
125 Array<u2>* Universe::_the_empty_short_array = NULL;
126 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
127 Array<Method*>* Universe::_the_empty_method_array = NULL;
129 // These variables are guarded by FullGCALot_lock.
130 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
131 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
133 // Heap
134 int Universe::_verify_count = 0;
136 int Universe::_base_vtable_size = 0;
137 bool Universe::_bootstrapping = false;
138 bool Universe::_fully_initialized = false;
140 size_t Universe::_heap_capacity_at_last_gc;
141 size_t Universe::_heap_used_at_last_gc = 0;
143 CollectedHeap* Universe::_collectedHeap = NULL;
145 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
146 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
147 address Universe::_narrow_ptrs_base;
149 void Universe::basic_type_classes_do(void f(Klass*)) {
150 f(boolArrayKlassObj());
151 f(byteArrayKlassObj());
152 f(charArrayKlassObj());
153 f(intArrayKlassObj());
154 f(shortArrayKlassObj());
155 f(longArrayKlassObj());
156 f(singleArrayKlassObj());
157 f(doubleArrayKlassObj());
158 }
160 void Universe::oops_do(OopClosure* f, bool do_all) {
162 f->do_oop((oop*) &_int_mirror);
163 f->do_oop((oop*) &_float_mirror);
164 f->do_oop((oop*) &_double_mirror);
165 f->do_oop((oop*) &_byte_mirror);
166 f->do_oop((oop*) &_bool_mirror);
167 f->do_oop((oop*) &_char_mirror);
168 f->do_oop((oop*) &_long_mirror);
169 f->do_oop((oop*) &_short_mirror);
170 f->do_oop((oop*) &_void_mirror);
172 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
173 f->do_oop((oop*) &_mirrors[i]);
174 }
175 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
177 f->do_oop((oop*)&_the_empty_class_klass_array);
178 f->do_oop((oop*)&_the_null_string);
179 f->do_oop((oop*)&_the_min_jint_string);
180 f->do_oop((oop*)&_out_of_memory_error_java_heap);
181 f->do_oop((oop*)&_out_of_memory_error_metaspace);
182 f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
183 f->do_oop((oop*)&_out_of_memory_error_array_size);
184 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
185 f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
186 f->do_oop((oop*)&_null_ptr_exception_instance);
187 f->do_oop((oop*)&_arithmetic_exception_instance);
188 f->do_oop((oop*)&_virtual_machine_error_instance);
189 f->do_oop((oop*)&_main_thread_group);
190 f->do_oop((oop*)&_system_thread_group);
191 f->do_oop((oop*)&_vm_exception);
192 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
193 }
195 // Serialize metadata in and out of CDS archive, not oops.
196 void Universe::serialize(SerializeClosure* f, bool do_all) {
198 f->do_ptr((void**)&_boolArrayKlassObj);
199 f->do_ptr((void**)&_byteArrayKlassObj);
200 f->do_ptr((void**)&_charArrayKlassObj);
201 f->do_ptr((void**)&_intArrayKlassObj);
202 f->do_ptr((void**)&_shortArrayKlassObj);
203 f->do_ptr((void**)&_longArrayKlassObj);
204 f->do_ptr((void**)&_singleArrayKlassObj);
205 f->do_ptr((void**)&_doubleArrayKlassObj);
206 f->do_ptr((void**)&_objectArrayKlassObj);
208 {
209 for (int i = 0; i < T_VOID+1; i++) {
210 if (_typeArrayKlassObjs[i] != NULL) {
211 assert(i >= T_BOOLEAN, "checking");
212 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
213 } else if (do_all) {
214 f->do_ptr((void**)&_typeArrayKlassObjs[i]);
215 }
216 }
217 }
219 f->do_ptr((void**)&_the_array_interfaces_array);
220 f->do_ptr((void**)&_the_empty_int_array);
221 f->do_ptr((void**)&_the_empty_short_array);
222 f->do_ptr((void**)&_the_empty_method_array);
223 f->do_ptr((void**)&_the_empty_klass_array);
224 _finalizer_register_cache->serialize(f);
225 _loader_addClass_cache->serialize(f);
226 _pd_implies_cache->serialize(f);
227 }
229 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
230 if (size < alignment || size % alignment != 0) {
231 vm_exit_during_initialization(
232 err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
233 }
234 }
236 void initialize_basic_type_klass(Klass* k, TRAPS) {
237 Klass* ok = SystemDictionary::Object_klass();
238 if (UseSharedSpaces) {
239 assert(k->super() == ok, "u3");
240 k->restore_unshareable_info(CHECK);
241 } else {
242 k->initialize_supers(ok, CHECK);
243 }
244 k->append_to_sibling_list();
245 }
247 void Universe::genesis(TRAPS) {
248 ResourceMark rm;
250 { FlagSetting fs(_bootstrapping, true);
252 { MutexLocker mc(Compile_lock);
254 // determine base vtable size; without that we cannot create the array klasses
255 compute_base_vtable_size();
257 if (!UseSharedSpaces) {
258 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
259 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
260 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
261 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
262 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
263 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
264 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
265 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
267 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
268 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
269 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
270 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
271 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
272 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
273 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
274 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
276 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
278 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
279 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
280 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
281 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
282 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
283 }
284 }
286 vmSymbols::initialize(CHECK);
288 SystemDictionary::initialize(CHECK);
290 Klass* ok = SystemDictionary::Object_klass();
292 _the_null_string = StringTable::intern("null", CHECK);
293 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
295 if (UseSharedSpaces) {
296 // Verify shared interfaces array.
297 assert(_the_array_interfaces_array->at(0) ==
298 SystemDictionary::Cloneable_klass(), "u3");
299 assert(_the_array_interfaces_array->at(1) ==
300 SystemDictionary::Serializable_klass(), "u3");
301 } else {
302 // Set up shared interfaces array. (Do this before supers are set up.)
303 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
304 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
305 }
307 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
308 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
309 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
310 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
311 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
312 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
313 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
314 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
315 } // end of core bootstrapping
317 // Maybe this could be lifted up now that object array can be initialized
318 // during the bootstrapping.
320 // OLD
321 // Initialize _objectArrayKlass after core bootstraping to make
322 // sure the super class is set up properly for _objectArrayKlass.
323 // ---
324 // NEW
325 // Since some of the old system object arrays have been converted to
326 // ordinary object arrays, _objectArrayKlass will be loaded when
327 // SystemDictionary::initialize(CHECK); is run. See the extra check
328 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
329 _objectArrayKlassObj = InstanceKlass::
330 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
331 // OLD
332 // Add the class to the class hierarchy manually to make sure that
333 // its vtable is initialized after core bootstrapping is completed.
334 // ---
335 // New
336 // Have already been initialized.
337 _objectArrayKlassObj->append_to_sibling_list();
339 // Compute is_jdk version flags.
340 // Only 1.3 or later has the java.lang.Shutdown class.
341 // Only 1.4 or later has the java.lang.CharSequence interface.
342 // Only 1.5 or later has the java.lang.management.MemoryUsage class.
343 if (JDK_Version::is_partially_initialized()) {
344 uint8_t jdk_version;
345 Klass* k = SystemDictionary::resolve_or_null(
346 vmSymbols::java_lang_management_MemoryUsage(), THREAD);
347 CLEAR_PENDING_EXCEPTION; // ignore exceptions
348 if (k == NULL) {
349 k = SystemDictionary::resolve_or_null(
350 vmSymbols::java_lang_CharSequence(), THREAD);
351 CLEAR_PENDING_EXCEPTION; // ignore exceptions
352 if (k == NULL) {
353 k = SystemDictionary::resolve_or_null(
354 vmSymbols::java_lang_Shutdown(), THREAD);
355 CLEAR_PENDING_EXCEPTION; // ignore exceptions
356 if (k == NULL) {
357 jdk_version = 2;
358 } else {
359 jdk_version = 3;
360 }
361 } else {
362 jdk_version = 4;
363 }
364 } else {
365 jdk_version = 5;
366 }
367 JDK_Version::fully_initialize(jdk_version);
368 }
370 #ifdef ASSERT
371 if (FullGCALot) {
372 // Allocate an array of dummy objects.
373 // We'd like these to be at the bottom of the old generation,
374 // so that when we free one and then collect,
375 // (almost) the whole heap moves
376 // and we find out if we actually update all the oops correctly.
377 // But we can't allocate directly in the old generation,
378 // so we allocate wherever, and hope that the first collection
379 // moves these objects to the bottom of the old generation.
380 // We can allocate directly in the permanent generation, so we do.
381 int size;
382 if (UseConcMarkSweepGC) {
383 warning("Using +FullGCALot with concurrent mark sweep gc "
384 "will not force all objects to relocate");
385 size = FullGCALotDummies;
386 } else {
387 size = FullGCALotDummies * 2;
388 }
389 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
390 objArrayHandle dummy_array(THREAD, naked_array);
391 int i = 0;
392 while (i < size) {
393 // Allocate dummy in old generation
394 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK);
395 dummy_array->obj_at_put(i++, dummy);
396 }
397 {
398 // Only modify the global variable inside the mutex.
399 // If we had a race to here, the other dummy_array instances
400 // and their elements just get dropped on the floor, which is fine.
401 MutexLocker ml(FullGCALot_lock);
402 if (_fullgc_alot_dummy_array == NULL) {
403 _fullgc_alot_dummy_array = dummy_array();
404 }
405 }
406 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
407 }
408 #endif
410 // Initialize dependency array for null class loader
411 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
413 }
415 // CDS support for patching vtables in metadata in the shared archive.
416 // All types inherited from Metadata have vtables, but not types inherited
417 // from MetaspaceObj, because the latter does not have virtual functions.
418 // If the metadata type has a vtable, it cannot be shared in the read-only
419 // section of the CDS archive, because the vtable pointer is patched.
420 static inline void add_vtable(void** list, int* n, void* o, int count) {
421 guarantee((*n) < count, "vtable list too small");
422 void* vtable = dereference_vptr(o);
423 assert(*(void**)(vtable) != NULL, "invalid vtable");
424 list[(*n)++] = vtable;
425 }
427 void Universe::init_self_patching_vtbl_list(void** list, int count) {
428 int n = 0;
429 { InstanceKlass o; add_vtable(list, &n, &o, count); }
430 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); }
431 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); }
432 { InstanceRefKlass o; add_vtable(list, &n, &o, count); }
433 { TypeArrayKlass o; add_vtable(list, &n, &o, count); }
434 { ObjArrayKlass o; add_vtable(list, &n, &o, count); }
435 { Method o; add_vtable(list, &n, &o, count); }
436 { ConstantPool o; add_vtable(list, &n, &o, count); }
437 }
439 void Universe::initialize_basic_type_mirrors(TRAPS) {
440 assert(_int_mirror==NULL, "basic type mirrors already initialized");
441 _int_mirror =
442 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
443 _float_mirror =
444 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
445 _double_mirror =
446 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
447 _byte_mirror =
448 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
449 _bool_mirror =
450 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
451 _char_mirror =
452 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
453 _long_mirror =
454 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
455 _short_mirror =
456 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
457 _void_mirror =
458 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
460 _mirrors[T_INT] = _int_mirror;
461 _mirrors[T_FLOAT] = _float_mirror;
462 _mirrors[T_DOUBLE] = _double_mirror;
463 _mirrors[T_BYTE] = _byte_mirror;
464 _mirrors[T_BOOLEAN] = _bool_mirror;
465 _mirrors[T_CHAR] = _char_mirror;
466 _mirrors[T_LONG] = _long_mirror;
467 _mirrors[T_SHORT] = _short_mirror;
468 _mirrors[T_VOID] = _void_mirror;
469 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror();
470 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror();
471 }
473 void Universe::fixup_mirrors(TRAPS) {
474 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
475 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
476 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
477 // that the number of objects allocated at this point is very small.
478 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
479 HandleMark hm(THREAD);
480 // Cache the start of the static fields
481 InstanceMirrorKlass::init_offset_of_static_fields();
483 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
484 int list_length = list->length();
485 for (int i = 0; i < list_length; i++) {
486 Klass* k = list->at(i);
487 assert(k->is_klass(), "List should only hold classes");
488 EXCEPTION_MARK;
489 KlassHandle kh(THREAD, k);
490 java_lang_Class::fixup_mirror(kh, CATCH);
491 }
492 delete java_lang_Class::fixup_mirror_list();
493 java_lang_Class::set_fixup_mirror_list(NULL);
494 }
496 static bool has_run_finalizers_on_exit = false;
498 void Universe::run_finalizers_on_exit() {
499 if (has_run_finalizers_on_exit) return;
500 has_run_finalizers_on_exit = true;
502 // Called on VM exit. This ought to be run in a separate thread.
503 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit");
504 {
505 PRESERVE_EXCEPTION_MARK;
506 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass());
507 JavaValue result(T_VOID);
508 JavaCalls::call_static(
509 &result,
510 finalizer_klass,
511 vmSymbols::run_finalizers_on_exit_name(),
512 vmSymbols::void_method_signature(),
513 THREAD
514 );
515 // Ignore any pending exceptions
516 CLEAR_PENDING_EXCEPTION;
517 }
518 }
521 // initialize_vtable could cause gc if
522 // 1) we specified true to initialize_vtable and
523 // 2) this ran after gc was enabled
524 // In case those ever change we use handles for oops
525 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) {
526 // init vtable of k and all subclasses
527 Klass* ko = k_h();
528 klassVtable* vt = ko->vtable();
529 if (vt) vt->initialize_vtable(false, CHECK);
530 if (ko->oop_is_instance()) {
531 InstanceKlass* ik = (InstanceKlass*)ko;
532 for (KlassHandle s_h(THREAD, ik->subklass());
533 s_h() != NULL;
534 s_h = KlassHandle(THREAD, s_h()->next_sibling())) {
535 reinitialize_vtable_of(s_h, CHECK);
536 }
537 }
538 }
541 void initialize_itable_for_klass(Klass* k, TRAPS) {
542 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK);
543 }
546 void Universe::reinitialize_itables(TRAPS) {
547 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK);
549 }
552 bool Universe::on_page_boundary(void* addr) {
553 return ((uintptr_t) addr) % os::vm_page_size() == 0;
554 }
557 bool Universe::should_fill_in_stack_trace(Handle throwable) {
558 // never attempt to fill in the stack trace of preallocated errors that do not have
559 // backtrace. These errors are kept alive forever and may be "re-used" when all
560 // preallocated errors with backtrace have been consumed. Also need to avoid
561 // a potential loop which could happen if an out of memory occurs when attempting
562 // to allocate the backtrace.
563 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
564 (throwable() != Universe::_out_of_memory_error_metaspace) &&
565 (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
566 (throwable() != Universe::_out_of_memory_error_array_size) &&
567 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit));
568 }
571 oop Universe::gen_out_of_memory_error(oop default_err) {
572 // generate an out of memory error:
573 // - if there is a preallocated error with backtrace available then return it wth
574 // a filled in stack trace.
575 // - if there are no preallocated errors with backtrace available then return
576 // an error without backtrace.
577 int next;
578 if (_preallocated_out_of_memory_error_avail_count > 0) {
579 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
580 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
581 } else {
582 next = -1;
583 }
584 if (next < 0) {
585 // all preallocated errors have been used.
586 // return default
587 return default_err;
588 } else {
589 // get the error object at the slot and set set it to NULL so that the
590 // array isn't keeping it alive anymore.
591 oop exc = preallocated_out_of_memory_errors()->obj_at(next);
592 assert(exc != NULL, "slot has been used already");
593 preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
595 // use the message from the default error
596 oop msg = java_lang_Throwable::message(default_err);
597 assert(msg != NULL, "no message");
598 java_lang_Throwable::set_message(exc, msg);
600 // populate the stack trace and return it.
601 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
602 return exc;
603 }
604 }
606 intptr_t Universe::_non_oop_bits = 0;
608 void* Universe::non_oop_word() {
609 // Neither the high bits nor the low bits of this value is allowed
610 // to look like (respectively) the high or low bits of a real oop.
611 //
612 // High and low are CPU-specific notions, but low always includes
613 // the low-order bit. Since oops are always aligned at least mod 4,
614 // setting the low-order bit will ensure that the low half of the
615 // word will never look like that of a real oop.
616 //
617 // Using the OS-supplied non-memory-address word (usually 0 or -1)
618 // will take care of the high bits, however many there are.
620 if (_non_oop_bits == 0) {
621 _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
622 }
624 return (void*)_non_oop_bits;
625 }
627 jint universe_init() {
628 assert(!Universe::_fully_initialized, "called after initialize_vtables");
629 guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
630 "LogHeapWordSize is incorrect.");
631 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
632 guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
633 "oop size is not not a multiple of HeapWord size");
634 TraceTime timer("Genesis", TraceStartupTime);
635 JavaClasses::compute_hard_coded_offsets();
637 jint status = Universe::initialize_heap();
638 if (status != JNI_OK) {
639 return status;
640 }
642 Metaspace::global_initialize();
644 // Create memory for metadata. Must be after initializing heap for
645 // DumpSharedSpaces.
646 ClassLoaderData::init_null_class_loader_data();
648 // We have a heap so create the Method* caches before
649 // Metaspace::initialize_shared_spaces() tries to populate them.
650 Universe::_finalizer_register_cache = new LatestMethodCache();
651 Universe::_loader_addClass_cache = new LatestMethodCache();
652 Universe::_pd_implies_cache = new LatestMethodCache();
654 if (UseSharedSpaces) {
655 // Read the data structures supporting the shared spaces (shared
656 // system dictionary, symbol table, etc.). After that, access to
657 // the file (other than the mapped regions) is no longer needed, and
658 // the file is closed. Closing the file does not affect the
659 // currently mapped regions.
660 MetaspaceShared::initialize_shared_spaces();
661 StringTable::create_table();
662 } else {
663 SymbolTable::create_table();
664 StringTable::create_table();
665 ClassLoader::create_package_info_table();
666 }
668 return JNI_OK;
669 }
671 // Choose the heap base address and oop encoding mode
672 // when compressed oops are used:
673 // Unscaled - Use 32-bits oops without encoding when
674 // NarrowOopHeapBaseMin + heap_size < 4Gb
675 // ZeroBased - Use zero based compressed oops with encoding when
676 // NarrowOopHeapBaseMin + heap_size < 32Gb
677 // HeapBased - Use compressed oops with heap base + encoding.
679 // 4Gb
680 static const uint64_t UnscaledOopHeapMax = (uint64_t(max_juint) + 1);
681 // 32Gb
682 // OopEncodingHeapMax == UnscaledOopHeapMax << LogMinObjAlignmentInBytes;
684 char* Universe::preferred_heap_base(size_t heap_size, size_t alignment, NARROW_OOP_MODE mode) {
685 assert(is_size_aligned((size_t)OopEncodingHeapMax, alignment), "Must be");
686 assert(is_size_aligned((size_t)UnscaledOopHeapMax, alignment), "Must be");
687 assert(is_size_aligned(heap_size, alignment), "Must be");
689 uintx heap_base_min_address_aligned = align_size_up(HeapBaseMinAddress, alignment);
691 size_t base = 0;
692 #ifdef _LP64
693 if (UseCompressedOops) {
694 assert(mode == UnscaledNarrowOop ||
695 mode == ZeroBasedNarrowOop ||
696 mode == HeapBasedNarrowOop, "mode is invalid");
697 const size_t total_size = heap_size + heap_base_min_address_aligned;
698 // Return specified base for the first request.
699 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) {
700 base = heap_base_min_address_aligned;
702 // If the total size is small enough to allow UnscaledNarrowOop then
703 // just use UnscaledNarrowOop.
704 } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop)) {
705 if ((total_size <= UnscaledOopHeapMax) && (mode == UnscaledNarrowOop) &&
706 (Universe::narrow_oop_shift() == 0)) {
707 // Use 32-bits oops without encoding and
708 // place heap's top on the 4Gb boundary
709 base = (UnscaledOopHeapMax - heap_size);
710 } else {
711 // Can't reserve with NarrowOopShift == 0
712 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
714 if (mode == UnscaledNarrowOop ||
715 mode == ZeroBasedNarrowOop && total_size <= UnscaledOopHeapMax) {
717 // Use zero based compressed oops with encoding and
718 // place heap's top on the 32Gb boundary in case
719 // total_size > 4Gb or failed to reserve below 4Gb.
720 uint64_t heap_top = OopEncodingHeapMax;
722 // For small heaps, save some space for compressed class pointer
723 // space so it can be decoded with no base.
724 if (UseCompressedClassPointers && !UseSharedSpaces &&
725 OopEncodingHeapMax <= 32*G) {
727 uint64_t class_space = align_size_up(CompressedClassSpaceSize, alignment);
728 assert(is_size_aligned((size_t)OopEncodingHeapMax-class_space,
729 alignment), "difference must be aligned too");
730 uint64_t new_top = OopEncodingHeapMax-class_space;
732 if (total_size <= new_top) {
733 heap_top = new_top;
734 }
735 }
737 // Align base to the adjusted top of the heap
738 base = heap_top - heap_size;
739 }
740 }
741 } else {
742 // UnscaledNarrowOop encoding didn't work, and no base was found for ZeroBasedOops or
743 // HeapBasedNarrowOop encoding was requested. So, can't reserve below 32Gb.
744 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
745 }
747 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks
748 // used in ReservedHeapSpace() constructors.
749 // The final values will be set in initialize_heap() below.
750 if ((base != 0) && ((base + heap_size) <= OopEncodingHeapMax)) {
751 // Use zero based compressed oops
752 Universe::set_narrow_oop_base(NULL);
753 // Don't need guard page for implicit checks in indexed
754 // addressing mode with zero based Compressed Oops.
755 Universe::set_narrow_oop_use_implicit_null_checks(true);
756 } else {
757 // Set to a non-NULL value so the ReservedSpace ctor computes
758 // the correct no-access prefix.
759 // The final value will be set in initialize_heap() below.
760 Universe::set_narrow_oop_base((address)UnscaledOopHeapMax);
761 #if defined(_WIN64) || defined(AIX)
762 if (UseLargePages) {
763 // Cannot allocate guard pages for implicit checks in indexed
764 // addressing mode when large pages are specified on windows.
765 Universe::set_narrow_oop_use_implicit_null_checks(false);
766 }
767 #endif // _WIN64
768 }
769 }
770 #endif
772 assert(is_ptr_aligned((char*)base, alignment), "Must be");
773 return (char*)base; // also return NULL (don't care) for 32-bit VM
774 }
776 jint Universe::initialize_heap() {
778 if (UseParallelGC) {
779 #if INCLUDE_ALL_GCS
780 Universe::_collectedHeap = new ParallelScavengeHeap();
781 #else // INCLUDE_ALL_GCS
782 fatal("UseParallelGC not supported in this VM.");
783 #endif // INCLUDE_ALL_GCS
785 } else if (UseG1GC) {
786 #if INCLUDE_ALL_GCS
787 G1CollectorPolicy* g1p = new G1CollectorPolicy();
788 g1p->initialize_all();
789 G1CollectedHeap* g1h = new G1CollectedHeap(g1p);
790 Universe::_collectedHeap = g1h;
791 #else // INCLUDE_ALL_GCS
792 fatal("UseG1GC not supported in java kernel vm.");
793 #endif // INCLUDE_ALL_GCS
795 } else {
796 GenCollectorPolicy *gc_policy;
798 if (UseSerialGC) {
799 gc_policy = new MarkSweepPolicy();
800 } else if (UseConcMarkSweepGC) {
801 #if INCLUDE_ALL_GCS
802 if (UseAdaptiveSizePolicy) {
803 gc_policy = new ASConcurrentMarkSweepPolicy();
804 } else {
805 gc_policy = new ConcurrentMarkSweepPolicy();
806 }
807 #else // INCLUDE_ALL_GCS
808 fatal("UseConcMarkSweepGC not supported in this VM.");
809 #endif // INCLUDE_ALL_GCS
810 } else { // default old generation
811 gc_policy = new MarkSweepPolicy();
812 }
813 gc_policy->initialize_all();
815 Universe::_collectedHeap = new GenCollectedHeap(gc_policy);
816 }
818 ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
820 jint status = Universe::heap()->initialize();
821 if (status != JNI_OK) {
822 return status;
823 }
825 #ifdef _LP64
826 if (UseCompressedOops) {
827 // Subtract a page because something can get allocated at heap base.
828 // This also makes implicit null checking work, because the
829 // memory+1 page below heap_base needs to cause a signal.
830 // See needs_explicit_null_check.
831 // Only set the heap base for compressed oops because it indicates
832 // compressed oops for pstack code.
833 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose);
834 if (verbose) {
835 tty->cr();
836 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
837 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M);
838 }
839 if (((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax)) {
840 // Can't reserve heap below 32Gb.
841 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap()
842 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
843 #ifdef AIX
844 // There is no protected page before the heap. This assures all oops
845 // are decoded so that NULL is preserved, so this page will not be accessed.
846 Universe::set_narrow_oop_use_implicit_null_checks(false);
847 #endif
848 if (verbose) {
849 tty->print(", %s: "PTR_FORMAT,
850 narrow_oop_mode_to_string(HeapBasedNarrowOop),
851 Universe::narrow_oop_base());
852 }
853 } else {
854 Universe::set_narrow_oop_base(0);
855 if (verbose) {
856 tty->print(", %s", narrow_oop_mode_to_string(ZeroBasedNarrowOop));
857 }
858 #ifdef _WIN64
859 if (!Universe::narrow_oop_use_implicit_null_checks()) {
860 // Don't need guard page for implicit checks in indexed addressing
861 // mode with zero based Compressed Oops.
862 Universe::set_narrow_oop_use_implicit_null_checks(true);
863 }
864 #endif // _WIN64
865 if((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
866 // Can't reserve heap below 4Gb.
867 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
868 } else {
869 Universe::set_narrow_oop_shift(0);
870 if (verbose) {
871 tty->print(", %s", narrow_oop_mode_to_string(UnscaledNarrowOop));
872 }
873 }
874 }
876 if (verbose) {
877 tty->cr();
878 tty->cr();
879 }
880 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
881 }
882 // Universe::narrow_oop_base() is one page below the heap.
883 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
884 os::vm_page_size()) ||
885 Universe::narrow_oop_base() == NULL, "invalid value");
886 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
887 Universe::narrow_oop_shift() == 0, "invalid value");
888 #endif
890 // We will never reach the CATCH below since Exceptions::_throw will cause
891 // the VM to exit if an exception is thrown during initialization
893 if (UseTLAB) {
894 assert(Universe::heap()->supports_tlab_allocation(),
895 "Should support thread-local allocation buffers");
896 ThreadLocalAllocBuffer::startup_initialization();
897 }
898 return JNI_OK;
899 }
902 // Reserve the Java heap, which is now the same for all GCs.
903 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
904 assert(alignment <= Arguments::conservative_max_heap_alignment(),
905 err_msg("actual alignment "SIZE_FORMAT" must be within maximum heap alignment "SIZE_FORMAT,
906 alignment, Arguments::conservative_max_heap_alignment()));
907 size_t total_reserved = align_size_up(heap_size, alignment);
908 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
909 "heap size is too big for compressed oops");
911 bool use_large_pages = UseLargePages && is_size_aligned(alignment, os::large_page_size());
912 assert(!UseLargePages
913 || UseParallelGC
914 || use_large_pages, "Wrong alignment to use large pages");
916 char* addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::UnscaledNarrowOop);
918 ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, addr);
920 if (UseCompressedOops) {
921 if (addr != NULL && !total_rs.is_reserved()) {
922 // Failed to reserve at specified address - the requested memory
923 // region is taken already, for example, by 'java' launcher.
924 // Try again to reserver heap higher.
925 addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::ZeroBasedNarrowOop);
927 ReservedHeapSpace total_rs0(total_reserved, alignment,
928 use_large_pages, addr);
930 if (addr != NULL && !total_rs0.is_reserved()) {
931 // Failed to reserve at specified address again - give up.
932 addr = Universe::preferred_heap_base(total_reserved, alignment, Universe::HeapBasedNarrowOop);
933 assert(addr == NULL, "");
935 ReservedHeapSpace total_rs1(total_reserved, alignment,
936 use_large_pages, addr);
937 total_rs = total_rs1;
938 } else {
939 total_rs = total_rs0;
940 }
941 }
942 }
944 if (!total_rs.is_reserved()) {
945 vm_exit_during_initialization(err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap", total_reserved/K));
946 return total_rs;
947 }
949 if (UseCompressedOops) {
950 // Universe::initialize_heap() will reset this to NULL if unscaled
951 // or zero-based narrow oops are actually used.
952 address base = (address)(total_rs.base() - os::vm_page_size());
953 Universe::set_narrow_oop_base(base);
954 }
955 return total_rs;
956 }
959 // It's the caller's responsibility to ensure glitch-freedom
960 // (if required).
961 void Universe::update_heap_info_at_gc() {
962 _heap_capacity_at_last_gc = heap()->capacity();
963 _heap_used_at_last_gc = heap()->used();
964 }
967 const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
968 switch (mode) {
969 case UnscaledNarrowOop:
970 return "32-bits Oops";
971 case ZeroBasedNarrowOop:
972 return "zero based Compressed Oops";
973 case HeapBasedNarrowOop:
974 return "Compressed Oops with base";
975 }
977 ShouldNotReachHere();
978 return "";
979 }
982 Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
983 if (narrow_oop_base() != 0) {
984 return HeapBasedNarrowOop;
985 }
987 if (narrow_oop_shift() != 0) {
988 return ZeroBasedNarrowOop;
989 }
991 return UnscaledNarrowOop;
992 }
995 void universe2_init() {
996 EXCEPTION_MARK;
997 Universe::genesis(CATCH);
998 }
1001 // This function is defined in JVM.cpp
1002 extern void initialize_converter_functions();
1004 bool universe_post_init() {
1005 assert(!is_init_completed(), "Error: initialization not yet completed!");
1006 Universe::_fully_initialized = true;
1007 EXCEPTION_MARK;
1008 { ResourceMark rm;
1009 Interpreter::initialize(); // needed for interpreter entry points
1010 if (!UseSharedSpaces) {
1011 HandleMark hm(THREAD);
1012 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass());
1013 Universe::reinitialize_vtable_of(ok_h, CHECK_false);
1014 Universe::reinitialize_itables(CHECK_false);
1015 }
1016 }
1018 HandleMark hm(THREAD);
1019 Klass* k;
1020 instanceKlassHandle k_h;
1021 // Setup preallocated empty java.lang.Class array
1022 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
1024 // Setup preallocated OutOfMemoryError errors
1025 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
1026 k_h = instanceKlassHandle(THREAD, k);
1027 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false);
1028 Universe::_out_of_memory_error_metaspace = k_h->allocate_instance(CHECK_false);
1029 Universe::_out_of_memory_error_class_metaspace = k_h->allocate_instance(CHECK_false);
1030 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false);
1031 Universe::_out_of_memory_error_gc_overhead_limit =
1032 k_h->allocate_instance(CHECK_false);
1034 // Setup preallocated NullPointerException
1035 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1036 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
1037 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1038 // Setup preallocated ArithmeticException
1039 // (this is currently used for a cheap & dirty solution in compiler exception handling)
1040 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
1041 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1042 // Virtual Machine Error for when we get into a situation we can't resolve
1043 k = SystemDictionary::resolve_or_fail(
1044 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1045 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1046 if (!linked) {
1047 tty->print_cr("Unable to link/verify VirtualMachineError class");
1048 return false; // initialization failed
1049 }
1050 Universe::_virtual_machine_error_instance =
1051 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1053 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1055 if (!DumpSharedSpaces) {
1056 // These are the only Java fields that are currently set during shared space dumping.
1057 // We prefer to not handle this generally, so we always reinitialize these detail messages.
1058 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1059 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1061 msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
1062 java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
1063 msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
1064 java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
1066 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1067 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1069 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1070 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1072 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1073 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1075 // Setup the array of errors that have preallocated backtrace
1076 k = Universe::_out_of_memory_error_java_heap->klass();
1077 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1078 k_h = instanceKlassHandle(THREAD, k);
1080 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1081 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false);
1082 for (int i=0; i<len; i++) {
1083 oop err = k_h->allocate_instance(CHECK_false);
1084 Handle err_h = Handle(THREAD, err);
1085 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1086 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1087 }
1088 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1089 }
1092 // Setup static method for registering finalizers
1093 // The finalizer klass must be linked before looking up the method, in
1094 // case it needs to get rewritten.
1095 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false);
1096 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method(
1097 vmSymbols::register_method_name(),
1098 vmSymbols::register_method_signature());
1099 if (m == NULL || !m->is_static()) {
1100 tty->print_cr("Unable to link/verify Finalizer.register method");
1101 return false; // initialization failed (cannot throw exception yet)
1102 }
1103 Universe::_finalizer_register_cache->init(
1104 SystemDictionary::Finalizer_klass(), m);
1106 InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->link_class(CHECK_false);
1107 m = InstanceKlass::cast(SystemDictionary::misc_Unsafe_klass())->find_method(
1108 vmSymbols::throwIllegalAccessError_name(),
1109 vmSymbols::void_method_signature());
1110 if (m != NULL && !m->is_static()) {
1111 // Note null is okay; this method is used in itables, and if it is null,
1112 // then AbstractMethodError is thrown instead.
1113 tty->print_cr("Unable to link/verify Unsafe.throwIllegalAccessError method");
1114 return false; // initialization failed (cannot throw exception yet)
1115 }
1116 Universe::_throw_illegal_access_error = m;
1118 // Setup method for registering loaded classes in class loader vector
1119 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false);
1120 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature());
1121 if (m == NULL || m->is_static()) {
1122 tty->print_cr("Unable to link/verify ClassLoader.addClass method");
1123 return false; // initialization failed (cannot throw exception yet)
1124 }
1125 Universe::_loader_addClass_cache->init(
1126 SystemDictionary::ClassLoader_klass(), m);
1128 // Setup method for checking protection domain
1129 InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->link_class(CHECK_false);
1130 m = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass())->
1131 find_method(vmSymbols::impliesCreateAccessControlContext_name(),
1132 vmSymbols::void_boolean_signature());
1133 // Allow NULL which should only happen with bootstrapping.
1134 if (m != NULL) {
1135 if (m->is_static()) {
1136 // NoSuchMethodException doesn't actually work because it tries to run the
1137 // <init> function before java_lang_Class is linked. Print error and exit.
1138 tty->print_cr("ProtectionDomain.impliesCreateAccessControlContext() has the wrong linkage");
1139 return false; // initialization failed
1140 }
1141 Universe::_pd_implies_cache->init(
1142 SystemDictionary::ProtectionDomain_klass(), m);;
1143 }
1145 // The folowing is initializing converter functions for serialization in
1146 // JVM.cpp. If we clean up the StrictMath code above we may want to find
1147 // a better solution for this as well.
1148 initialize_converter_functions();
1150 // This needs to be done before the first scavenge/gc, since
1151 // it's an input to soft ref clearing policy.
1152 {
1153 MutexLocker x(Heap_lock);
1154 Universe::update_heap_info_at_gc();
1155 }
1157 // ("weak") refs processing infrastructure initialization
1158 Universe::heap()->post_initialize();
1160 // Initialize performance counters for metaspaces
1161 MetaspaceCounters::initialize_performance_counters();
1162 CompressedClassSpaceCounters::initialize_performance_counters();
1164 MemoryService::add_metaspace_memory_pools();
1166 MemoryService::set_universe_heap(Universe::_collectedHeap);
1167 return true;
1168 }
1171 void Universe::compute_base_vtable_size() {
1172 _base_vtable_size = ClassLoader::compute_Object_vtable();
1173 }
1176 // %%% The Universe::flush_foo methods belong in CodeCache.
1178 // Flushes compiled methods dependent on dependee.
1179 void Universe::flush_dependents_on(instanceKlassHandle dependee) {
1180 assert_lock_strong(Compile_lock);
1182 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return;
1184 // CodeCache can only be updated by a thread_in_VM and they will all be
1185 // stopped dring the safepoint so CodeCache will be safe to update without
1186 // holding the CodeCache_lock.
1188 KlassDepChange changes(dependee);
1190 // Compute the dependent nmethods
1191 if (CodeCache::mark_for_deoptimization(changes) > 0) {
1192 // At least one nmethod has been marked for deoptimization
1193 VM_Deoptimize op;
1194 VMThread::execute(&op);
1195 }
1196 }
1198 // Flushes compiled methods dependent on a particular CallSite
1199 // instance when its target is different than the given MethodHandle.
1200 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) {
1201 assert_lock_strong(Compile_lock);
1203 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return;
1205 // CodeCache can only be updated by a thread_in_VM and they will all be
1206 // stopped dring the safepoint so CodeCache will be safe to update without
1207 // holding the CodeCache_lock.
1209 CallSiteDepChange changes(call_site(), method_handle());
1211 // Compute the dependent nmethods that have a reference to a
1212 // CallSite object. We use InstanceKlass::mark_dependent_nmethod
1213 // directly instead of CodeCache::mark_for_deoptimization because we
1214 // want dependents on the call site class only not all classes in
1215 // the ContextStream.
1216 int marked = 0;
1217 {
1218 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1219 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass());
1220 marked = call_site_klass->mark_dependent_nmethods(changes);
1221 }
1222 if (marked > 0) {
1223 // At least one nmethod has been marked for deoptimization
1224 VM_Deoptimize op;
1225 VMThread::execute(&op);
1226 }
1227 }
1229 #ifdef HOTSWAP
1230 // Flushes compiled methods dependent on dependee in the evolutionary sense
1231 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) {
1232 // --- Compile_lock is not held. However we are at a safepoint.
1233 assert_locked_or_safepoint(Compile_lock);
1234 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return;
1236 // CodeCache can only be updated by a thread_in_VM and they will all be
1237 // stopped dring the safepoint so CodeCache will be safe to update without
1238 // holding the CodeCache_lock.
1240 // Compute the dependent nmethods
1241 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) {
1242 // At least one nmethod has been marked for deoptimization
1244 // All this already happens inside a VM_Operation, so we'll do all the work here.
1245 // Stuff copied from VM_Deoptimize and modified slightly.
1247 // We do not want any GCs to happen while we are in the middle of this VM operation
1248 ResourceMark rm;
1249 DeoptimizationMarker dm;
1251 // Deoptimize all activations depending on marked nmethods
1252 Deoptimization::deoptimize_dependents();
1254 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies)
1255 CodeCache::make_marked_nmethods_not_entrant();
1256 }
1257 }
1258 #endif // HOTSWAP
1261 // Flushes compiled methods dependent on dependee
1262 void Universe::flush_dependents_on_method(methodHandle m_h) {
1263 // --- Compile_lock is not held. However we are at a safepoint.
1264 assert_locked_or_safepoint(Compile_lock);
1266 // CodeCache can only be updated by a thread_in_VM and they will all be
1267 // stopped dring the safepoint so CodeCache will be safe to update without
1268 // holding the CodeCache_lock.
1270 // Compute the dependent nmethods
1271 if (CodeCache::mark_for_deoptimization(m_h()) > 0) {
1272 // At least one nmethod has been marked for deoptimization
1274 // All this already happens inside a VM_Operation, so we'll do all the work here.
1275 // Stuff copied from VM_Deoptimize and modified slightly.
1277 // We do not want any GCs to happen while we are in the middle of this VM operation
1278 ResourceMark rm;
1279 DeoptimizationMarker dm;
1281 // Deoptimize all activations depending on marked nmethods
1282 Deoptimization::deoptimize_dependents();
1284 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies)
1285 CodeCache::make_marked_nmethods_not_entrant();
1286 }
1287 }
1289 void Universe::print() {
1290 print_on(gclog_or_tty);
1291 }
1293 void Universe::print_on(outputStream* st, bool extended) {
1294 st->print_cr("Heap");
1295 if (!extended) {
1296 heap()->print_on(st);
1297 } else {
1298 heap()->print_extended_on(st);
1299 }
1300 }
1302 void Universe::print_heap_at_SIGBREAK() {
1303 if (PrintHeapAtSIGBREAK) {
1304 MutexLocker hl(Heap_lock);
1305 print_on(tty);
1306 tty->cr();
1307 tty->flush();
1308 }
1309 }
1311 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) {
1312 st->print_cr("{Heap before GC invocations=%u (full %u):",
1313 heap()->total_collections(),
1314 heap()->total_full_collections());
1315 if (!PrintHeapAtGCExtended || ignore_extended) {
1316 heap()->print_on(st);
1317 } else {
1318 heap()->print_extended_on(st);
1319 }
1320 }
1322 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) {
1323 st->print_cr("Heap after GC invocations=%u (full %u):",
1324 heap()->total_collections(),
1325 heap()->total_full_collections());
1326 if (!PrintHeapAtGCExtended || ignore_extended) {
1327 heap()->print_on(st);
1328 } else {
1329 heap()->print_extended_on(st);
1330 }
1331 st->print_cr("}");
1332 }
1334 void Universe::verify(VerifyOption option, const char* prefix, bool silent) {
1335 // The use of _verify_in_progress is a temporary work around for
1336 // 6320749. Don't bother with a creating a class to set and clear
1337 // it since it is only used in this method and the control flow is
1338 // straight forward.
1339 _verify_in_progress = true;
1341 COMPILER2_PRESENT(
1342 assert(!DerivedPointerTable::is_active(),
1343 "DPT should not be active during verification "
1344 "(of thread stacks below)");
1345 )
1347 ResourceMark rm;
1348 HandleMark hm; // Handles created during verification can be zapped
1349 _verify_count++;
1351 if (!silent) gclog_or_tty->print(prefix);
1352 if (!silent) gclog_or_tty->print("[Verifying ");
1353 if (!silent) gclog_or_tty->print("threads ");
1354 Threads::verify();
1355 if (!silent) gclog_or_tty->print("heap ");
1356 heap()->verify(silent, option);
1357 if (!silent) gclog_or_tty->print("syms ");
1358 SymbolTable::verify();
1359 if (!silent) gclog_or_tty->print("strs ");
1360 StringTable::verify();
1361 {
1362 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1363 if (!silent) gclog_or_tty->print("zone ");
1364 CodeCache::verify();
1365 }
1366 if (!silent) gclog_or_tty->print("dict ");
1367 SystemDictionary::verify();
1368 #ifndef PRODUCT
1369 if (!silent) gclog_or_tty->print("cldg ");
1370 ClassLoaderDataGraph::verify();
1371 #endif
1372 if (!silent) gclog_or_tty->print("metaspace chunks ");
1373 MetaspaceAux::verify_free_chunks();
1374 if (!silent) gclog_or_tty->print("hand ");
1375 JNIHandles::verify();
1376 if (!silent) gclog_or_tty->print("C-heap ");
1377 os::check_heap();
1378 if (!silent) gclog_or_tty->print("code cache ");
1379 CodeCache::verify_oops();
1380 if (!silent) gclog_or_tty->print_cr("]");
1382 _verify_in_progress = false;
1383 }
1385 // Oop verification (see MacroAssembler::verify_oop)
1387 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1};
1388 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1};
1391 #ifndef PRODUCT
1393 static void calculate_verify_data(uintptr_t verify_data[2],
1394 HeapWord* low_boundary,
1395 HeapWord* high_boundary) {
1396 assert(low_boundary < high_boundary, "bad interval");
1398 // decide which low-order bits we require to be clear:
1399 size_t alignSize = MinObjAlignmentInBytes;
1400 size_t min_object_size = CollectedHeap::min_fill_size();
1402 // make an inclusive limit:
1403 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1404 uintptr_t min = (uintptr_t)low_boundary;
1405 assert(min < max, "bad interval");
1406 uintptr_t diff = max ^ min;
1408 // throw away enough low-order bits to make the diff vanish
1409 uintptr_t mask = (uintptr_t)(-1);
1410 while ((mask & diff) != 0)
1411 mask <<= 1;
1412 uintptr_t bits = (min & mask);
1413 assert(bits == (max & mask), "correct mask");
1414 // check an intermediate value between min and max, just to make sure:
1415 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1417 // require address alignment, too:
1418 mask |= (alignSize - 1);
1420 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) {
1421 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability");
1422 }
1423 verify_data[0] = mask;
1424 verify_data[1] = bits;
1425 }
1427 // Oop verification (see MacroAssembler::verify_oop)
1429 uintptr_t Universe::verify_oop_mask() {
1430 MemRegion m = heap()->reserved_region();
1431 calculate_verify_data(_verify_oop_data,
1432 m.start(),
1433 m.end());
1434 return _verify_oop_data[0];
1435 }
1439 uintptr_t Universe::verify_oop_bits() {
1440 verify_oop_mask();
1441 return _verify_oop_data[1];
1442 }
1444 uintptr_t Universe::verify_mark_mask() {
1445 return markOopDesc::lock_mask_in_place;
1446 }
1448 uintptr_t Universe::verify_mark_bits() {
1449 intptr_t mask = verify_mark_mask();
1450 intptr_t bits = (intptr_t)markOopDesc::prototype();
1451 assert((bits & ~mask) == 0, "no stray header bits");
1452 return bits;
1453 }
1454 #endif // PRODUCT
1457 void Universe::compute_verify_oop_data() {
1458 verify_oop_mask();
1459 verify_oop_bits();
1460 verify_mark_mask();
1461 verify_mark_bits();
1462 }
1465 void LatestMethodCache::init(Klass* k, Method* m) {
1466 if (!UseSharedSpaces) {
1467 _klass = k;
1468 }
1469 #ifndef PRODUCT
1470 else {
1471 // sharing initilization should have already set up _klass
1472 assert(_klass != NULL, "just checking");
1473 }
1474 #endif
1476 _method_idnum = m->method_idnum();
1477 assert(_method_idnum >= 0, "sanity check");
1478 }
1481 Method* LatestMethodCache::get_method() {
1482 if (klass() == NULL) return NULL;
1483 InstanceKlass* ik = InstanceKlass::cast(klass());
1484 Method* m = ik->method_with_idnum(method_idnum());
1485 assert(m != NULL, "sanity check");
1486 return m;
1487 }
1490 #ifdef ASSERT
1491 // Release dummy object(s) at bottom of heap
1492 bool Universe::release_fullgc_alot_dummy() {
1493 MutexLocker ml(FullGCALot_lock);
1494 if (_fullgc_alot_dummy_array != NULL) {
1495 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1496 // No more dummies to release, release entire array instead
1497 _fullgc_alot_dummy_array = NULL;
1498 return false;
1499 }
1500 if (!UseConcMarkSweepGC) {
1501 // Release dummy at bottom of old generation
1502 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1503 }
1504 // Release dummy at bottom of permanent generation
1505 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1506 }
1507 return true;
1508 }
1510 #endif // ASSERT