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 */
24
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/aprofiler.hpp"
56 #include "runtime/arguments.hpp"
57 #include "runtime/deoptimization.hpp"
58 #include "runtime/fprofiler.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/init.hpp"
61 #include "runtime/java.hpp"
62 #include "runtime/javaCalls.hpp"
63 #include "runtime/sharedRuntime.hpp"
64 #include "runtime/synchronizer.hpp"
65 #include "runtime/thread.inline.hpp"
66 #include "runtime/timer.hpp"
67 #include "runtime/vm_operations.hpp"
68 #include "services/memoryService.hpp"
69 #include "utilities/copy.hpp"
70 #include "utilities/events.hpp"
71 #include "utilities/hashtable.inline.hpp"
72 #include "utilities/preserveException.hpp"
73 #include "utilities/macros.hpp"
74 #if INCLUDE_ALL_GCS
75 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp"
76 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp"
77 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
78 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
79 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
80 #endif // INCLUDE_ALL_GCS
81
82 // Known objects
83 Klass* Universe::_boolArrayKlassObj = NULL;
84 Klass* Universe::_byteArrayKlassObj = NULL;
85 Klass* Universe::_charArrayKlassObj = NULL;
86 Klass* Universe::_intArrayKlassObj = NULL;
87 Klass* Universe::_shortArrayKlassObj = NULL;
88 Klass* Universe::_longArrayKlassObj = NULL;
89 Klass* Universe::_singleArrayKlassObj = NULL;
90 Klass* Universe::_doubleArrayKlassObj = NULL;
91 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
92 Klass* Universe::_objectArrayKlassObj = NULL;
93 oop Universe::_int_mirror = NULL;
94 oop Universe::_float_mirror = NULL;
95 oop Universe::_double_mirror = NULL;
96 oop Universe::_byte_mirror = NULL;
97 oop Universe::_bool_mirror = NULL;
98 oop Universe::_char_mirror = NULL;
99 oop Universe::_long_mirror = NULL;
100 oop Universe::_short_mirror = NULL;
101 oop Universe::_void_mirror = NULL;
102 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
103 oop Universe::_main_thread_group = NULL;
104 oop Universe::_system_thread_group = NULL;
105 objArrayOop Universe::_the_empty_class_klass_array = NULL;
106 Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
107 oop Universe::_the_null_string = NULL;
108 oop Universe::_the_min_jint_string = NULL;
109 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL;
110 LatestMethodOopCache* Universe::_loader_addClass_cache = NULL;
111 ActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL;
112 oop Universe::_out_of_memory_error_java_heap = NULL;
113 oop Universe::_out_of_memory_error_perm_gen = 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 Array<int>* Universe::_the_empty_int_array = NULL;
124 Array<u2>* Universe::_the_empty_short_array = NULL;
125 Array<Klass*>* Universe::_the_empty_klass_array = NULL;
126 Array<Method*>* Universe::_the_empty_method_array = NULL;
127
128 // These variables are guarded by FullGCALot_lock.
129 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
130 debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
131
132 // Heap
133 int Universe::_verify_count = 0;
134
135 int Universe::_base_vtable_size = 0;
136 bool Universe::_bootstrapping = false;
137 bool Universe::_fully_initialized = false;
138
139 size_t Universe::_heap_capacity_at_last_gc;
140 size_t Universe::_heap_used_at_last_gc = 0;
141
142 CollectedHeap* Universe::_collectedHeap = NULL;
143
144 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
145 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
146 address Universe::_narrow_ptrs_base;
147
148 size_t Universe::_class_metaspace_size;
149
150 void Universe::basic_type_classes_do(void f(Klass*)) {
151 f(boolArrayKlassObj());
152 f(byteArrayKlassObj());
153 f(charArrayKlassObj());
154 f(intArrayKlassObj());
155 f(shortArrayKlassObj());
156 f(longArrayKlassObj());
157 f(singleArrayKlassObj());
158 f(doubleArrayKlassObj());
159 }
160
161 void Universe::oops_do(OopClosure* f, bool do_all) {
162
163 f->do_oop((oop*) &_int_mirror);
164 f->do_oop((oop*) &_float_mirror);
165 f->do_oop((oop*) &_double_mirror);
166 f->do_oop((oop*) &_byte_mirror);
167 f->do_oop((oop*) &_bool_mirror);
168 f->do_oop((oop*) &_char_mirror);
169 f->do_oop((oop*) &_long_mirror);
170 f->do_oop((oop*) &_short_mirror);
171 f->do_oop((oop*) &_void_mirror);
172
173 for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
174 f->do_oop((oop*) &_mirrors[i]);
175 }
176 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
177
178 f->do_oop((oop*)&_the_empty_class_klass_array);
179 f->do_oop((oop*)&_the_null_string);
180 f->do_oop((oop*)&_the_min_jint_string);
181 f->do_oop((oop*)&_out_of_memory_error_java_heap);
182 f->do_oop((oop*)&_out_of_memory_error_perm_gen);
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 }
194
195 // Serialize metadata in and out of CDS archive, not oops.
196 void Universe::serialize(SerializeClosure* f, bool do_all) {
197
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);
207
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 }
218
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 _reflect_invoke_cache->serialize(f);
227 }
228
229 void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
230 if (size < alignment || size % alignment != 0) {
231 ResourceMark rm;
232 stringStream st;
233 st.print("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment);
234 char* error = st.as_string();
235 vm_exit_during_initialization(error);
236 }
237 }
238
239 void initialize_basic_type_klass(Klass* k, TRAPS) {
240 Klass* ok = SystemDictionary::Object_klass();
241 if (UseSharedSpaces) {
242 assert(k->super() == ok, "u3");
243 k->restore_unshareable_info(CHECK);
244 } else {
245 k->initialize_supers(ok, CHECK);
246 }
247 k->append_to_sibling_list();
248 }
249
250 void Universe::genesis(TRAPS) {
251 ResourceMark rm;
252
253 { FlagSetting fs(_bootstrapping, true);
254
255 { MutexLocker mc(Compile_lock);
256
257 // determine base vtable size; without that we cannot create the array klasses
258 compute_base_vtable_size();
259
260 if (!UseSharedSpaces) {
261 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
262 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
263 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
264 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
265 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
266 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
267 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
268 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
269
270 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
271 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
272 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
273 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
274 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
275 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
276 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
277 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
278
279 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
280
281 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
282 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
283 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
284 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
285 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
286 }
287 }
288
289 vmSymbols::initialize(CHECK);
290
291 SystemDictionary::initialize(CHECK);
292
293 Klass* ok = SystemDictionary::Object_klass();
294
295 _the_null_string = StringTable::intern("null", CHECK);
296 _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
297
298 if (UseSharedSpaces) {
299 // Verify shared interfaces array.
300 assert(_the_array_interfaces_array->at(0) ==
301 SystemDictionary::Cloneable_klass(), "u3");
302 assert(_the_array_interfaces_array->at(1) ==
303 SystemDictionary::Serializable_klass(), "u3");
304 } else {
305 // Set up shared interfaces array. (Do this before supers are set up.)
306 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
307 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
308 }
309
310 initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
311 initialize_basic_type_klass(charArrayKlassObj(), CHECK);
312 initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
313 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
314 initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
315 initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
316 initialize_basic_type_klass(intArrayKlassObj(), CHECK);
317 initialize_basic_type_klass(longArrayKlassObj(), CHECK);
318 } // end of core bootstrapping
319
320 // Maybe this could be lifted up now that object array can be initialized
321 // during the bootstrapping.
322
323 // OLD
324 // Initialize _objectArrayKlass after core bootstraping to make
325 // sure the super class is set up properly for _objectArrayKlass.
326 // ---
327 // NEW
328 // Since some of the old system object arrays have been converted to
329 // ordinary object arrays, _objectArrayKlass will be loaded when
330 // SystemDictionary::initialize(CHECK); is run. See the extra check
331 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
332 _objectArrayKlassObj = InstanceKlass::
333 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
334 // OLD
335 // Add the class to the class hierarchy manually to make sure that
336 // its vtable is initialized after core bootstrapping is completed.
337 // ---
338 // New
339 // Have already been initialized.
340 _objectArrayKlassObj->append_to_sibling_list();
341
342 // Compute is_jdk version flags.
343 // Only 1.3 or later has the java.lang.Shutdown class.
344 // Only 1.4 or later has the java.lang.CharSequence interface.
345 // Only 1.5 or later has the java.lang.management.MemoryUsage class.
346 if (JDK_Version::is_partially_initialized()) {
347 uint8_t jdk_version;
348 Klass* k = SystemDictionary::resolve_or_null(
349 vmSymbols::java_lang_management_MemoryUsage(), THREAD);
350 CLEAR_PENDING_EXCEPTION; // ignore exceptions
351 if (k == NULL) {
352 k = SystemDictionary::resolve_or_null(
353 vmSymbols::java_lang_CharSequence(), THREAD);
354 CLEAR_PENDING_EXCEPTION; // ignore exceptions
355 if (k == NULL) {
356 k = SystemDictionary::resolve_or_null(
357 vmSymbols::java_lang_Shutdown(), THREAD);
358 CLEAR_PENDING_EXCEPTION; // ignore exceptions
359 if (k == NULL) {
360 jdk_version = 2;
361 } else {
362 jdk_version = 3;
363 }
364 } else {
365 jdk_version = 4;
366 }
367 } else {
368 jdk_version = 5;
369 }
370 JDK_Version::fully_initialize(jdk_version);
371 }
372
373 #ifdef ASSERT
374 if (FullGCALot) {
375 // Allocate an array of dummy objects.
376 // We'd like these to be at the bottom of the old generation,
377 // so that when we free one and then collect,
378 // (almost) the whole heap moves
379 // and we find out if we actually update all the oops correctly.
380 // But we can't allocate directly in the old generation,
381 // so we allocate wherever, and hope that the first collection
382 // moves these objects to the bottom of the old generation.
383 // We can allocate directly in the permanent generation, so we do.
384 int size;
385 if (UseConcMarkSweepGC) {
386 warning("Using +FullGCALot with concurrent mark sweep gc "
387 "will not force all objects to relocate");
388 size = FullGCALotDummies;
389 } else {
390 size = FullGCALotDummies * 2;
391 }
392 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
393 objArrayHandle dummy_array(THREAD, naked_array);
394 int i = 0;
395 while (i < size) {
396 // Allocate dummy in old generation
397 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK);
398 dummy_array->obj_at_put(i++, dummy);
399 }
400 {
401 // Only modify the global variable inside the mutex.
402 // If we had a race to here, the other dummy_array instances
403 // and their elements just get dropped on the floor, which is fine.
404 MutexLocker ml(FullGCALot_lock);
405 if (_fullgc_alot_dummy_array == NULL) {
406 _fullgc_alot_dummy_array = dummy_array();
407 }
408 }
409 assert(i == _fullgc_alot_dummy_array->length(), "just checking");
410 }
411 #endif
412
413 // Initialize dependency array for null class loader
414 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
415
416 }
417
418 // CDS support for patching vtables in metadata in the shared archive.
419 // All types inherited from Metadata have vtables, but not types inherited
420 // from MetaspaceObj, because the latter does not have virtual functions.
421 // If the metadata type has a vtable, it cannot be shared in the read-only
422 // section of the CDS archive, because the vtable pointer is patched.
423 static inline void add_vtable(void** list, int* n, void* o, int count) {
424 guarantee((*n) < count, "vtable list too small");
425 void* vtable = dereference_vptr(o);
426 assert(*(void**)(vtable) != NULL, "invalid vtable");
427 list[(*n)++] = vtable;
428 }
429
430 void Universe::init_self_patching_vtbl_list(void** list, int count) {
431 int n = 0;
432 { InstanceKlass o; add_vtable(list, &n, &o, count); }
433 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); }
434 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); }
435 { InstanceRefKlass o; add_vtable(list, &n, &o, count); }
436 { TypeArrayKlass o; add_vtable(list, &n, &o, count); }
437 { ObjArrayKlass o; add_vtable(list, &n, &o, count); }
438 { Method o; add_vtable(list, &n, &o, count); }
439 { ConstantPool o; add_vtable(list, &n, &o, count); }
440 }
441
442 void Universe::initialize_basic_type_mirrors(TRAPS) {
443 assert(_int_mirror==NULL, "basic type mirrors already initialized");
444 _int_mirror =
445 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
446 _float_mirror =
447 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
448 _double_mirror =
449 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
450 _byte_mirror =
451 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
452 _bool_mirror =
453 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
454 _char_mirror =
455 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
456 _long_mirror =
457 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
458 _short_mirror =
459 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
460 _void_mirror =
461 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
462
463 _mirrors[T_INT] = _int_mirror;
464 _mirrors[T_FLOAT] = _float_mirror;
465 _mirrors[T_DOUBLE] = _double_mirror;
466 _mirrors[T_BYTE] = _byte_mirror;
467 _mirrors[T_BOOLEAN] = _bool_mirror;
468 _mirrors[T_CHAR] = _char_mirror;
469 _mirrors[T_LONG] = _long_mirror;
470 _mirrors[T_SHORT] = _short_mirror;
471 _mirrors[T_VOID] = _void_mirror;
472 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror();
473 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror();
474 }
475
476 void Universe::fixup_mirrors(TRAPS) {
477 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
478 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
479 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
480 // that the number of objects allocated at this point is very small.
481 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
482 HandleMark hm(THREAD);
483 // Cache the start of the static fields
484 InstanceMirrorKlass::init_offset_of_static_fields();
485
486 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
487 int list_length = list->length();
488 for (int i = 0; i < list_length; i++) {
489 Klass* k = list->at(i);
490 assert(k->is_klass(), "List should only hold classes");
491 EXCEPTION_MARK;
492 KlassHandle kh(THREAD, k);
493 java_lang_Class::fixup_mirror(kh, CATCH);
494 }
495 delete java_lang_Class::fixup_mirror_list();
496 java_lang_Class::set_fixup_mirror_list(NULL);
497 }
498
499 static bool has_run_finalizers_on_exit = false;
500
501 void Universe::run_finalizers_on_exit() {
502 if (has_run_finalizers_on_exit) return;
503 has_run_finalizers_on_exit = true;
504
505 // Called on VM exit. This ought to be run in a separate thread.
506 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit");
507 {
508 PRESERVE_EXCEPTION_MARK;
509 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass());
510 JavaValue result(T_VOID);
511 JavaCalls::call_static(
512 &result,
513 finalizer_klass,
514 vmSymbols::run_finalizers_on_exit_name(),
515 vmSymbols::void_method_signature(),
516 THREAD
517 );
518 // Ignore any pending exceptions
519 CLEAR_PENDING_EXCEPTION;
520 }
521 }
522
523
524 // initialize_vtable could cause gc if
525 // 1) we specified true to initialize_vtable and
526 // 2) this ran after gc was enabled
527 // In case those ever change we use handles for oops
528 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) {
529 // init vtable of k and all subclasses
530 Klass* ko = k_h();
531 klassVtable* vt = ko->vtable();
532 if (vt) vt->initialize_vtable(false, CHECK);
533 if (ko->oop_is_instance()) {
534 InstanceKlass* ik = (InstanceKlass*)ko;
535 for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->next_sibling())) {
536 reinitialize_vtable_of(s_h, CHECK);
537 }
538 }
539 }
540
541
542 void initialize_itable_for_klass(Klass* k, TRAPS) {
543 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK);
544 }
545
546
547 void Universe::reinitialize_itables(TRAPS) {
548 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK);
549
550 }
551
552
553 bool Universe::on_page_boundary(void* addr) {
554 return ((uintptr_t) addr) % os::vm_page_size() == 0;
555 }
556
557
558 bool Universe::should_fill_in_stack_trace(Handle throwable) {
559 // never attempt to fill in the stack trace of preallocated errors that do not have
560 // backtrace. These errors are kept alive forever and may be "re-used" when all
561 // preallocated errors with backtrace have been consumed. Also need to avoid
562 // a potential loop which could happen if an out of memory occurs when attempting
563 // to allocate the backtrace.
564 return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
565 (throwable() != Universe::_out_of_memory_error_perm_gen) &&
566 (throwable() != Universe::_out_of_memory_error_array_size) &&
567 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit));
568 }
569
570
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);
594
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);
599
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 }
605
606 static intptr_t non_oop_bits = 0;
607
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.
619
620 if (non_oop_bits == 0) {
621 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
622 }
623
624 return (void*)non_oop_bits;
625 }
626
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 GC_locker::lock(); // do not allow gc during bootstrapping
636 JavaClasses::compute_hard_coded_offsets();
637
638 jint status = Universe::initialize_heap();
639 if (status != JNI_OK) {
640 return status;
641 }
642
643 // Create memory for metadata. Must be after initializing heap for
644 // DumpSharedSpaces.
645 ClassLoaderData::init_null_class_loader_data();
646
647 // We have a heap so create the Method* caches before
648 // Metaspace::initialize_shared_spaces() tries to populate them.
649 Universe::_finalizer_register_cache = new LatestMethodOopCache();
650 Universe::_loader_addClass_cache = new LatestMethodOopCache();
651 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache();
652
653 if (UseSharedSpaces) {
654 // Read the data structures supporting the shared spaces (shared
655 // system dictionary, symbol table, etc.). After that, access to
656 // the file (other than the mapped regions) is no longer needed, and
657 // the file is closed. Closing the file does not affect the
658 // currently mapped regions.
659 MetaspaceShared::initialize_shared_spaces();
660 StringTable::create_table();
661 } else {
662 SymbolTable::create_table();
663 StringTable::create_table();
664 ClassLoader::create_package_info_table();
665 }
666
667 return JNI_OK;
668 }
669
670 // Choose the heap base address and oop encoding mode
671 // when compressed oops are used:
672 // Unscaled - Use 32-bits oops without encoding when
673 // NarrowOopHeapBaseMin + heap_size < 4Gb
674 // ZeroBased - Use zero based compressed oops with encoding when
675 // NarrowOopHeapBaseMin + heap_size < 32Gb
676 // HeapBased - Use compressed oops with heap base + encoding.
677
678 // 4Gb
679 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1);
680 // 32Gb
681 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes;
682
683 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) {
684 size_t base = 0;
685 #ifdef _LP64
686 if (UseCompressedOops) {
687 assert(mode == UnscaledNarrowOop ||
688 mode == ZeroBasedNarrowOop ||
689 mode == HeapBasedNarrowOop, "mode is invalid");
690 const size_t total_size = heap_size + HeapBaseMinAddress;
691 // Return specified base for the first request.
692 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) {
693 base = HeapBaseMinAddress;
694
695 // If the total size and the metaspace size are small enough to allow
696 // UnscaledNarrowOop then just use UnscaledNarrowOop.
697 } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop) &&
698 (!UseCompressedKlassPointers ||
699 (((OopEncodingHeapMax - heap_size) + Universe::class_metaspace_size()) <= KlassEncodingMetaspaceMax))) {
700 // We don't need to check the metaspace size here because it is always smaller
701 // than total_size.
702 if ((total_size <= NarrowOopHeapMax) && (mode == UnscaledNarrowOop) &&
703 (Universe::narrow_oop_shift() == 0)) {
704 // Use 32-bits oops without encoding and
705 // place heap's top on the 4Gb boundary
706 base = (NarrowOopHeapMax - heap_size);
707 } else {
708 // Can't reserve with NarrowOopShift == 0
709 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
710 if (mode == UnscaledNarrowOop ||
711 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) {
712 // Use zero based compressed oops with encoding and
713 // place heap's top on the 32Gb boundary in case
714 // total_size > 4Gb or failed to reserve below 4Gb.
715 base = (OopEncodingHeapMax - heap_size);
716 }
717 }
718
719 // See if ZeroBaseNarrowOop encoding will work for a heap based at
720 // (KlassEncodingMetaspaceMax - class_metaspace_size()).
721 } else if (UseCompressedKlassPointers && (mode != HeapBasedNarrowOop) &&
722 (Universe::class_metaspace_size() + HeapBaseMinAddress <= KlassEncodingMetaspaceMax) &&
723 (KlassEncodingMetaspaceMax + heap_size - Universe::class_metaspace_size() <= OopEncodingHeapMax)) {
724 base = (KlassEncodingMetaspaceMax - Universe::class_metaspace_size());
725 } else {
726 // UnscaledNarrowOop encoding didn't work, and no base was found for ZeroBasedOops or
727 // HeapBasedNarrowOop encoding was requested. So, can't reserve below 32Gb.
728 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
729 }
730
731 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks
732 // used in ReservedHeapSpace() constructors.
733 // The final values will be set in initialize_heap() below.
734 if ((base != 0) && ((base + heap_size) <= OopEncodingHeapMax) &&
735 (!UseCompressedKlassPointers || (base + Universe::class_metaspace_size()) <= KlassEncodingMetaspaceMax)) {
736 // Use zero based compressed oops
737 Universe::set_narrow_oop_base(NULL);
738 // Don't need guard page for implicit checks in indexed
739 // addressing mode with zero based Compressed Oops.
740 Universe::set_narrow_oop_use_implicit_null_checks(true);
741 } else {
742 // Set to a non-NULL value so the ReservedSpace ctor computes
743 // the correct no-access prefix.
744 // The final value will be set in initialize_heap() below.
745 Universe::set_narrow_oop_base((address)NarrowOopHeapMax);
746 #ifdef _WIN64
747 if (UseLargePages) {
748 // Cannot allocate guard pages for implicit checks in indexed
749 // addressing mode when large pages are specified on windows.
750 Universe::set_narrow_oop_use_implicit_null_checks(false);
751 }
752 #endif // _WIN64
753 }
754 }
755 #endif
756 return (char*)base; // also return NULL (don't care) for 32-bit VM
757 }
758
759 jint Universe::initialize_heap() {
760
761 if (UseParallelGC) {
762 #if INCLUDE_ALL_GCS
763 Universe::_collectedHeap = new ParallelScavengeHeap();
764 #else // INCLUDE_ALL_GCS
765 fatal("UseParallelGC not supported in this VM.");
766 #endif // INCLUDE_ALL_GCS
767
768 } else if (UseG1GC) {
769 #if INCLUDE_ALL_GCS
770 G1CollectorPolicy* g1p = new G1CollectorPolicy();
771 G1CollectedHeap* g1h = new G1CollectedHeap(g1p);
772 Universe::_collectedHeap = g1h;
773 #else // INCLUDE_ALL_GCS
774 fatal("UseG1GC not supported in java kernel vm.");
775 #endif // INCLUDE_ALL_GCS
776
777 } else {
778 GenCollectorPolicy *gc_policy;
779
780 if (UseSerialGC) {
781 gc_policy = new MarkSweepPolicy();
782 } else if (UseConcMarkSweepGC) {
783 #if INCLUDE_ALL_GCS
784 if (UseAdaptiveSizePolicy) {
785 gc_policy = new ASConcurrentMarkSweepPolicy();
786 } else {
787 gc_policy = new ConcurrentMarkSweepPolicy();
788 }
789 #else // INCLUDE_ALL_GCS
790 fatal("UseConcMarkSweepGC not supported in this VM.");
791 #endif // INCLUDE_ALL_GCS
792 } else { // default old generation
793 gc_policy = new MarkSweepPolicy();
794 }
795
796 Universe::_collectedHeap = new GenCollectedHeap(gc_policy);
797 }
798
799 jint status = Universe::heap()->initialize();
800 if (status != JNI_OK) {
801 return status;
802 }
803
804 #ifdef _LP64
805 if (UseCompressedOops) {
806 // Subtract a page because something can get allocated at heap base.
807 // This also makes implicit null checking work, because the
808 // memory+1 page below heap_base needs to cause a signal.
809 // See needs_explicit_null_check.
810 // Only set the heap base for compressed oops because it indicates
811 // compressed oops for pstack code.
812 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose);
813 if (verbose) {
814 tty->cr();
815 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
816 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M);
817 }
818 if (((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) ||
819 (UseCompressedKlassPointers &&
820 ((uint64_t)Universe::heap()->base() + Universe::class_metaspace_size() > KlassEncodingMetaspaceMax))) {
821 // Can't reserve heap below 32Gb.
822 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap()
823 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
824 if (verbose) {
825 tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base());
826 }
827 } else {
828 Universe::set_narrow_oop_base(0);
829 if (verbose) {
830 tty->print(", zero based Compressed Oops");
831 }
832 #ifdef _WIN64
833 if (!Universe::narrow_oop_use_implicit_null_checks()) {
834 // Don't need guard page for implicit checks in indexed addressing
835 // mode with zero based Compressed Oops.
836 Universe::set_narrow_oop_use_implicit_null_checks(true);
837 }
838 #endif // _WIN64
839 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) {
840 // Can't reserve heap below 4Gb.
841 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
842 } else {
843 Universe::set_narrow_oop_shift(0);
844 if (verbose) {
845 tty->print(", 32-bits Oops");
846 }
847 }
848 }
849 if (verbose) {
850 tty->cr();
851 tty->cr();
852 }
853 if (UseCompressedKlassPointers) {
854 Universe::set_narrow_klass_base(Universe::narrow_oop_base());
855 Universe::set_narrow_klass_shift(MIN2(Universe::narrow_oop_shift(), LogKlassAlignmentInBytes));
856 }
857 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
858 }
859 // Universe::narrow_oop_base() is one page below the metaspace
860 // base. The actual metaspace base depends on alignment constraints
861 // so we don't know its exact location here.
862 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - os::vm_page_size() - ClassMetaspaceSize) ||
863 Universe::narrow_oop_base() == NULL, "invalid value");
864 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
865 Universe::narrow_oop_shift() == 0, "invalid value");
866 #endif
867
868 // We will never reach the CATCH below since Exceptions::_throw will cause
869 // the VM to exit if an exception is thrown during initialization
870
871 if (UseTLAB) {
872 assert(Universe::heap()->supports_tlab_allocation(),
873 "Should support thread-local allocation buffers");
874 ThreadLocalAllocBuffer::startup_initialization();
875 }
876 return JNI_OK;
877 }
878
879
880 // Reserve the Java heap, which is now the same for all GCs.
881 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
882 assert(alignment <= Arguments::max_heap_alignment(), "actual alignment must be within maximum heap alignment");
883 // Add in the class metaspace area so the classes in the headers can
884 // be compressed the same as instances.
885 // Need to round class space size up because it's below the heap and
886 // the actual alignment depends on its size.
887 Universe::set_class_metaspace_size(align_size_up(ClassMetaspaceSize, alignment));
888 size_t total_reserved = align_size_up(heap_size, alignment) + Universe::class_metaspace_size();
889 assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
890 "heap size is too big for compressed oops");
891 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop);
892
893 ReservedHeapSpace total_rs(total_reserved, alignment, UseLargePages, addr);
894
895 if (UseCompressedOops) {
896 if (addr != NULL && !total_rs.is_reserved()) {
897 // Failed to reserve at specified address - the requested memory
898 // region is taken already, for example, by 'java' launcher.
899 // Try again to reserver heap higher.
900 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop);
901
902 ReservedHeapSpace total_rs0(total_reserved, alignment,
903 UseLargePages, addr);
904
905 if (addr != NULL && !total_rs0.is_reserved()) {
906 // Failed to reserve at specified address again - give up.
907 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop);
908 assert(addr == NULL, "");
909
910 ReservedHeapSpace total_rs1(total_reserved, alignment,
911 UseLargePages, addr);
912 total_rs = total_rs1;
913 } else {
914 total_rs = total_rs0;
915 }
916 }
917 }
918
919 if (!total_rs.is_reserved()) {
920 vm_exit_during_initialization(err_msg("Could not reserve enough space for object heap %d bytes", total_reserved));
921 return total_rs;
922 }
923
924 // Split the reserved space into main Java heap and a space for
925 // classes so that they can be compressed using the same algorithm
926 // as compressed oops. If compress oops and compress klass ptrs are
927 // used we need the meta space first: if the alignment used for
928 // compressed oops is greater than the one used for compressed klass
929 // ptrs, a metadata space on top of the heap could become
930 // unreachable.
931 ReservedSpace class_rs = total_rs.first_part(Universe::class_metaspace_size());
932 ReservedSpace heap_rs = total_rs.last_part(Universe::class_metaspace_size(), alignment);
933 Metaspace::initialize_class_space(class_rs);
934
935 if (UseCompressedOops) {
936 // Universe::initialize_heap() will reset this to NULL if unscaled
937 // or zero-based narrow oops are actually used.
938 address base = (address)(total_rs.base() - os::vm_page_size());
939 Universe::set_narrow_oop_base(base);
940 }
941 return heap_rs;
942 }
943
944
945 // It's the caller's repsonsibility to ensure glitch-freedom
946 // (if required).
947 void Universe::update_heap_info_at_gc() {
948 _heap_capacity_at_last_gc = heap()->capacity();
949 _heap_used_at_last_gc = heap()->used();
950 }
951
952
953
954 void universe2_init() {
955 EXCEPTION_MARK;
956 Universe::genesis(CATCH);
957 }
958
959
960 // This function is defined in JVM.cpp
961 extern void initialize_converter_functions();
962
963 bool universe_post_init() {
964 assert(!is_init_completed(), "Error: initialization not yet completed!");
965 Universe::_fully_initialized = true;
966 EXCEPTION_MARK;
967 { ResourceMark rm;
968 Interpreter::initialize(); // needed for interpreter entry points
969 if (!UseSharedSpaces) {
970 HandleMark hm(THREAD);
971 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass());
972 Universe::reinitialize_vtable_of(ok_h, CHECK_false);
973 Universe::reinitialize_itables(CHECK_false);
974 }
975 }
976
977 HandleMark hm(THREAD);
978 Klass* k;
979 instanceKlassHandle k_h;
980 // Setup preallocated empty java.lang.Class array
981 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
982
983 // Setup preallocated OutOfMemoryError errors
984 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
985 k_h = instanceKlassHandle(THREAD, k);
986 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false);
987 Universe::_out_of_memory_error_perm_gen = k_h->allocate_instance(CHECK_false);
988 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false);
989 Universe::_out_of_memory_error_gc_overhead_limit =
990 k_h->allocate_instance(CHECK_false);
991
992 // Setup preallocated NullPointerException
993 // (this is currently used for a cheap & dirty solution in compiler exception handling)
994 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
995 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
996 // Setup preallocated ArithmeticException
997 // (this is currently used for a cheap & dirty solution in compiler exception handling)
998 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
999 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1000 // Virtual Machine Error for when we get into a situation we can't resolve
1001 k = SystemDictionary::resolve_or_fail(
1002 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
1003 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
1004 if (!linked) {
1005 tty->print_cr("Unable to link/verify VirtualMachineError class");
1006 return false; // initialization failed
1007 }
1008 Universe::_virtual_machine_error_instance =
1009 InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1010
1011 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
1012
1013 if (!DumpSharedSpaces) {
1014 // These are the only Java fields that are currently set during shared space dumping.
1015 // We prefer to not handle this generally, so we always reinitialize these detail messages.
1016 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
1017 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
1018
1019 msg = java_lang_String::create_from_str("Metadata space", CHECK_false);
1020 java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg());
1021
1022 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
1023 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
1024
1025 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
1026 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
1027
1028 msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
1029 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
1030
1031 // Setup the array of errors that have preallocated backtrace
1032 k = Universe::_out_of_memory_error_java_heap->klass();
1033 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
1034 k_h = instanceKlassHandle(THREAD, k);
1035
1036 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
1037 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false);
1038 for (int i=0; i<len; i++) {
1039 oop err = k_h->allocate_instance(CHECK_false);
1040 Handle err_h = Handle(THREAD, err);
1041 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
1042 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
1043 }
1044 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
1045 }
1046
1047
1048 // Setup static method for registering finalizers
1049 // The finalizer klass must be linked before looking up the method, in
1050 // case it needs to get rewritten.
1051 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false);
1052 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method(
1053 vmSymbols::register_method_name(),
1054 vmSymbols::register_method_signature());
1055 if (m == NULL || !m->is_static()) {
1056 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(),
1057 "java.lang.ref.Finalizer.register", false);
1058 }
1059 Universe::_finalizer_register_cache->init(
1060 SystemDictionary::Finalizer_klass(), m, CHECK_false);
1061
1062 // Resolve on first use and initialize class.
1063 // Note: No race-condition here, since a resolve will always return the same result
1064
1065 // Setup method for security checks
1066 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_reflect_Method(), true, CHECK_false);
1067 k_h = instanceKlassHandle(THREAD, k);
1068 k_h->link_class(CHECK_false);
1069 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature());
1070 if (m == NULL || m->is_static()) {
1071 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(),
1072 "java.lang.reflect.Method.invoke", false);
1073 }
1074 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false);
1075
1076 // Setup method for registering loaded classes in class loader vector
1077 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false);
1078 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature());
1079 if (m == NULL || m->is_static()) {
1080 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(),
1081 "java.lang.ClassLoader.addClass", false);
1082 }
1083 Universe::_loader_addClass_cache->init(
1084 SystemDictionary::ClassLoader_klass(), m, CHECK_false);
1085
1086 // The folowing is initializing converter functions for serialization in
1087 // JVM.cpp. If we clean up the StrictMath code above we may want to find
1088 // a better solution for this as well.
1089 initialize_converter_functions();
1090
1091 // This needs to be done before the first scavenge/gc, since
1092 // it's an input to soft ref clearing policy.
1093 {
1094 MutexLocker x(Heap_lock);
1095 Universe::update_heap_info_at_gc();
1096 }
1097
1098 // ("weak") refs processing infrastructure initialization
1099 Universe::heap()->post_initialize();
1100
1101 // Initialize performance counters for metaspaces
1102 MetaspaceCounters::initialize_performance_counters();
1103
1104 GC_locker::unlock(); // allow gc after bootstrapping
1105
1106 MemoryService::set_universe_heap(Universe::_collectedHeap);
1107 return true;
1108 }
1109
1110
1111 void Universe::compute_base_vtable_size() {
1112 _base_vtable_size = ClassLoader::compute_Object_vtable();
1113 }
1114
1115
1116 // %%% The Universe::flush_foo methods belong in CodeCache.
1117
1118 // Flushes compiled methods dependent on dependee.
1119 void Universe::flush_dependents_on(instanceKlassHandle dependee) {
1120 assert_lock_strong(Compile_lock);
1121
1122 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return;
1123
1124 // CodeCache can only be updated by a thread_in_VM and they will all be
1125 // stopped dring the safepoint so CodeCache will be safe to update without
1126 // holding the CodeCache_lock.
1127
1128 KlassDepChange changes(dependee);
1129
1130 // Compute the dependent nmethods
1131 if (CodeCache::mark_for_deoptimization(changes) > 0) {
1132 // At least one nmethod has been marked for deoptimization
1133 VM_Deoptimize op;
1134 VMThread::execute(&op);
1135 }
1136 }
1137
1138 // Flushes compiled methods dependent on a particular CallSite
1139 // instance when its target is different than the given MethodHandle.
1140 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) {
1141 assert_lock_strong(Compile_lock);
1142
1143 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return;
1144
1145 // CodeCache can only be updated by a thread_in_VM and they will all be
1146 // stopped dring the safepoint so CodeCache will be safe to update without
1147 // holding the CodeCache_lock.
1148
1149 CallSiteDepChange changes(call_site(), method_handle());
1150
1151 // Compute the dependent nmethods that have a reference to a
1152 // CallSite object. We use InstanceKlass::mark_dependent_nmethod
1153 // directly instead of CodeCache::mark_for_deoptimization because we
1154 // want dependents on the call site class only not all classes in
1155 // the ContextStream.
1156 int marked = 0;
1157 {
1158 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1159 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass());
1160 marked = call_site_klass->mark_dependent_nmethods(changes);
1161 }
1162 if (marked > 0) {
1163 // At least one nmethod has been marked for deoptimization
1164 VM_Deoptimize op;
1165 VMThread::execute(&op);
1166 }
1167 }
1168
1169 #ifdef HOTSWAP
1170 // Flushes compiled methods dependent on dependee in the evolutionary sense
1171 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) {
1172 // --- Compile_lock is not held. However we are at a safepoint.
1173 assert_locked_or_safepoint(Compile_lock);
1174 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return;
1175
1176 // CodeCache can only be updated by a thread_in_VM and they will all be
1177 // stopped dring the safepoint so CodeCache will be safe to update without
1178 // holding the CodeCache_lock.
1179
1180 // Compute the dependent nmethods
1181 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) {
1182 // At least one nmethod has been marked for deoptimization
1183
1184 // All this already happens inside a VM_Operation, so we'll do all the work here.
1185 // Stuff copied from VM_Deoptimize and modified slightly.
1186
1187 // We do not want any GCs to happen while we are in the middle of this VM operation
1188 ResourceMark rm;
1189 DeoptimizationMarker dm;
1190
1191 // Deoptimize all activations depending on marked nmethods
1192 Deoptimization::deoptimize_dependents();
1193
1194 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies)
1195 CodeCache::make_marked_nmethods_not_entrant();
1196 }
1197 }
1198 #endif // HOTSWAP
1199
1200
1201 // Flushes compiled methods dependent on dependee
1202 void Universe::flush_dependents_on_method(methodHandle m_h) {
1203 // --- Compile_lock is not held. However we are at a safepoint.
1204 assert_locked_or_safepoint(Compile_lock);
1205
1206 // CodeCache can only be updated by a thread_in_VM and they will all be
1207 // stopped dring the safepoint so CodeCache will be safe to update without
1208 // holding the CodeCache_lock.
1209
1210 // Compute the dependent nmethods
1211 if (CodeCache::mark_for_deoptimization(m_h()) > 0) {
1212 // At least one nmethod has been marked for deoptimization
1213
1214 // All this already happens inside a VM_Operation, so we'll do all the work here.
1215 // Stuff copied from VM_Deoptimize and modified slightly.
1216
1217 // We do not want any GCs to happen while we are in the middle of this VM operation
1218 ResourceMark rm;
1219 DeoptimizationMarker dm;
1220
1221 // Deoptimize all activations depending on marked nmethods
1222 Deoptimization::deoptimize_dependents();
1223
1224 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies)
1225 CodeCache::make_marked_nmethods_not_entrant();
1226 }
1227 }
1228
1229 void Universe::print() {
1230 print_on(gclog_or_tty);
1231 }
1232
1233 void Universe::print_on(outputStream* st, bool extended) {
1234 st->print_cr("Heap");
1235 if (!extended) {
1236 heap()->print_on(st);
1237 } else {
1238 heap()->print_extended_on(st);
1239 }
1240 }
1241
1242 void Universe::print_heap_at_SIGBREAK() {
1243 if (PrintHeapAtSIGBREAK) {
1244 MutexLocker hl(Heap_lock);
1245 print_on(tty);
1246 tty->cr();
1247 tty->flush();
1248 }
1249 }
1250
1251 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) {
1252 st->print_cr("{Heap before GC invocations=%u (full %u):",
1253 heap()->total_collections(),
1254 heap()->total_full_collections());
1255 if (!PrintHeapAtGCExtended || ignore_extended) {
1256 heap()->print_on(st);
1257 } else {
1258 heap()->print_extended_on(st);
1259 }
1260 }
1261
1262 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) {
1263 st->print_cr("Heap after GC invocations=%u (full %u):",
1264 heap()->total_collections(),
1265 heap()->total_full_collections());
1266 if (!PrintHeapAtGCExtended || ignore_extended) {
1267 heap()->print_on(st);
1268 } else {
1269 heap()->print_extended_on(st);
1270 }
1271 st->print_cr("}");
1272 }
1273
1274 void Universe::verify(VerifyOption option, const char* prefix, bool silent) {
1275 // The use of _verify_in_progress is a temporary work around for
1276 // 6320749. Don't bother with a creating a class to set and clear
1277 // it since it is only used in this method and the control flow is
1278 // straight forward.
1279 _verify_in_progress = true;
1280
1281 COMPILER2_PRESENT(
1282 assert(!DerivedPointerTable::is_active(),
1283 "DPT should not be active during verification "
1284 "(of thread stacks below)");
1285 )
1286
1287 ResourceMark rm;
1288 HandleMark hm; // Handles created during verification can be zapped
1289 _verify_count++;
1290
1291 if (!silent) gclog_or_tty->print(prefix);
1292 if (!silent) gclog_or_tty->print("[Verifying ");
1293 if (!silent) gclog_or_tty->print("threads ");
1294 Threads::verify();
1295 if (!silent) gclog_or_tty->print("heap ");
1296 heap()->verify(silent, option);
1297 if (!silent) gclog_or_tty->print("syms ");
1298 SymbolTable::verify();
1299 if (!silent) gclog_or_tty->print("strs ");
1300 StringTable::verify();
1301 {
1302 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1303 if (!silent) gclog_or_tty->print("zone ");
1304 CodeCache::verify();
1305 }
1306 if (!silent) gclog_or_tty->print("dict ");
1307 SystemDictionary::verify();
1308 #ifndef PRODUCT
1309 if (!silent) gclog_or_tty->print("cldg ");
1310 ClassLoaderDataGraph::verify();
1311 #endif
1312 if (!silent) gclog_or_tty->print("metaspace chunks ");
1313 MetaspaceAux::verify_free_chunks();
1314 if (!silent) gclog_or_tty->print("hand ");
1315 JNIHandles::verify();
1316 if (!silent) gclog_or_tty->print("C-heap ");
1317 os::check_heap();
1318 if (!silent) gclog_or_tty->print("code cache ");
1319 CodeCache::verify_oops();
1320 if (!silent) gclog_or_tty->print_cr("]");
1321
1322 _verify_in_progress = false;
1323 }
1324
1325 // Oop verification (see MacroAssembler::verify_oop)
1326
1327 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1};
1328 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1};
1329
1330
1331 #ifndef PRODUCT
1332
1333 static void calculate_verify_data(uintptr_t verify_data[2],
1334 HeapWord* low_boundary,
1335 HeapWord* high_boundary) {
1336 assert(low_boundary < high_boundary, "bad interval");
1337
1338 // decide which low-order bits we require to be clear:
1339 size_t alignSize = MinObjAlignmentInBytes;
1340 size_t min_object_size = CollectedHeap::min_fill_size();
1341
1342 // make an inclusive limit:
1343 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
1344 uintptr_t min = (uintptr_t)low_boundary;
1345 assert(min < max, "bad interval");
1346 uintptr_t diff = max ^ min;
1347
1348 // throw away enough low-order bits to make the diff vanish
1349 uintptr_t mask = (uintptr_t)(-1);
1350 while ((mask & diff) != 0)
1351 mask <<= 1;
1352 uintptr_t bits = (min & mask);
1353 assert(bits == (max & mask), "correct mask");
1354 // check an intermediate value between min and max, just to make sure:
1355 assert(bits == ((min + (max-min)/2) & mask), "correct mask");
1356
1357 // require address alignment, too:
1358 mask |= (alignSize - 1);
1359
1360 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) {
1361 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability");
1362 }
1363 verify_data[0] = mask;
1364 verify_data[1] = bits;
1365 }
1366
1367 // Oop verification (see MacroAssembler::verify_oop)
1368
1369 uintptr_t Universe::verify_oop_mask() {
1370 MemRegion m = heap()->reserved_region();
1371 calculate_verify_data(_verify_oop_data,
1372 m.start(),
1373 m.end());
1374 return _verify_oop_data[0];
1375 }
1376
1377
1378
1379 uintptr_t Universe::verify_oop_bits() {
1380 verify_oop_mask();
1381 return _verify_oop_data[1];
1382 }
1383
1384 uintptr_t Universe::verify_mark_mask() {
1385 return markOopDesc::lock_mask_in_place;
1386 }
1387
1388 uintptr_t Universe::verify_mark_bits() {
1389 intptr_t mask = verify_mark_mask();
1390 intptr_t bits = (intptr_t)markOopDesc::prototype();
1391 assert((bits & ~mask) == 0, "no stray header bits");
1392 return bits;
1393 }
1394 #endif // PRODUCT
1395
1396
1397 void Universe::compute_verify_oop_data() {
1398 verify_oop_mask();
1399 verify_oop_bits();
1400 verify_mark_mask();
1401 verify_mark_bits();
1402 }
1403
1404
1405 void CommonMethodOopCache::init(Klass* k, Method* m, TRAPS) {
1406 if (!UseSharedSpaces) {
1407 _klass = k;
1408 }
1409 #ifndef PRODUCT
1410 else {
1411 // sharing initilization should have already set up _klass
1412 assert(_klass != NULL, "just checking");
1413 }
1414 #endif
1415
1416 _method_idnum = m->method_idnum();
1417 assert(_method_idnum >= 0, "sanity check");
1418 }
1419
1420
1421 ActiveMethodOopsCache::~ActiveMethodOopsCache() {
1422 if (_prev_methods != NULL) {
1423 delete _prev_methods;
1424 _prev_methods = NULL;
1425 }
1426 }
1427
1428
1429 void ActiveMethodOopsCache::add_previous_version(Method* const method) {
1430 assert(Thread::current()->is_VM_thread(),
1431 "only VMThread can add previous versions");
1432
1433 // Only append the previous method if it is executing on the stack.
1434 if (method->on_stack()) {
1435
1436 if (_prev_methods == NULL) {
1437 // This is the first previous version so make some space.
1438 // Start with 2 elements under the assumption that the class
1439 // won't be redefined much.
1440 _prev_methods = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Method*>(2, true);
1441 }
1442
1443 // RC_TRACE macro has an embedded ResourceMark
1444 RC_TRACE(0x00000100,
1445 ("add: %s(%s): adding prev version ref for cached method @%d",
1446 method->name()->as_C_string(), method->signature()->as_C_string(),
1447 _prev_methods->length()));
1448
1449 _prev_methods->append(method);
1450 }
1451
1452
1453 // Since the caller is the VMThread and we are at a safepoint, this is a good
1454 // time to clear out unused method references.
1455
1456 if (_prev_methods == NULL) return;
1457
1458 for (int i = _prev_methods->length() - 1; i >= 0; i--) {
1459 Method* method = _prev_methods->at(i);
1460 assert(method != NULL, "weak method ref was unexpectedly cleared");
1461
1462 if (!method->on_stack()) {
1463 // This method isn't running anymore so remove it
1464 _prev_methods->remove_at(i);
1465 MetadataFactory::free_metadata(method->method_holder()->class_loader_data(), method);
1466 } else {
1467 // RC_TRACE macro has an embedded ResourceMark
1468 RC_TRACE(0x00000400, ("add: %s(%s): previous cached method @%d is alive",
1469 method->name()->as_C_string(), method->signature()->as_C_string(), i));
1470 }
1471 }
1472 } // end add_previous_version()
1473
1474
1475 bool ActiveMethodOopsCache::is_same_method(Method* const method) const {
1476 InstanceKlass* ik = InstanceKlass::cast(klass());
1477 Method* check_method = ik->method_with_idnum(method_idnum());
1478 assert(check_method != NULL, "sanity check");
1479 if (check_method == method) {
1480 // done with the easy case
1481 return true;
1482 }
1483
1484 if (_prev_methods != NULL) {
1485 // The cached method has been redefined at least once so search
1486 // the previous versions for a match.
1487 for (int i = 0; i < _prev_methods->length(); i++) {
1488 check_method = _prev_methods->at(i);
1489 if (check_method == method) {
1490 // a previous version matches
1491 return true;
1492 }
1493 }
1494 }
1495
1496 // either no previous versions or no previous version matched
1497 return false;
1498 }
1499
1500
1501 Method* LatestMethodOopCache::get_Method() {
1502 InstanceKlass* ik = InstanceKlass::cast(klass());
1503 Method* m = ik->method_with_idnum(method_idnum());
1504 assert(m != NULL, "sanity check");
1505 return m;
1506 }
1507
1508
1509 #ifdef ASSERT
1510 // Release dummy object(s) at bottom of heap
1511 bool Universe::release_fullgc_alot_dummy() {
1512 MutexLocker ml(FullGCALot_lock);
1513 if (_fullgc_alot_dummy_array != NULL) {
1514 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
1515 // No more dummies to release, release entire array instead
1516 _fullgc_alot_dummy_array = NULL;
1517 return false;
1518 }
1519 if (!UseConcMarkSweepGC) {
1520 // Release dummy at bottom of old generation
1521 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1522 }
1523 // Release dummy at bottom of permanent generation
1524 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
1525 }
1526 return true;
1527 }
1528
1529 #endif // ASSERT