1 /* 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 # include "incls/_precompiled.incl" 26 # include "incls/_universe.cpp.incl" 27 28 // Known objects 29 klassOop Universe::_boolArrayKlassObj = NULL; 30 klassOop Universe::_byteArrayKlassObj = NULL; 31 klassOop Universe::_charArrayKlassObj = NULL; 32 klassOop Universe::_intArrayKlassObj = NULL; 33 klassOop Universe::_shortArrayKlassObj = NULL; 34 klassOop Universe::_longArrayKlassObj = NULL; 35 klassOop Universe::_singleArrayKlassObj = NULL; 36 klassOop Universe::_doubleArrayKlassObj = NULL; 37 klassOop Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 38 klassOop Universe::_objectArrayKlassObj = NULL; 39 klassOop Universe::_symbolKlassObj = NULL; 40 klassOop Universe::_methodKlassObj = NULL; 41 klassOop Universe::_constMethodKlassObj = NULL; 42 klassOop Universe::_methodDataKlassObj = NULL; 43 klassOop Universe::_klassKlassObj = NULL; 44 klassOop Universe::_arrayKlassKlassObj = NULL; 45 klassOop Universe::_objArrayKlassKlassObj = NULL; 46 klassOop Universe::_typeArrayKlassKlassObj = NULL; 47 klassOop Universe::_instanceKlassKlassObj = NULL; 48 klassOop Universe::_constantPoolKlassObj = NULL; 49 klassOop Universe::_constantPoolCacheKlassObj = NULL; 50 klassOop Universe::_compiledICHolderKlassObj = NULL; 51 klassOop Universe::_systemObjArrayKlassObj = NULL; 52 oop Universe::_int_mirror = NULL; 53 oop Universe::_float_mirror = NULL; 54 oop Universe::_double_mirror = NULL; 55 oop Universe::_byte_mirror = NULL; 56 oop Universe::_bool_mirror = NULL; 57 oop Universe::_char_mirror = NULL; 58 oop Universe::_long_mirror = NULL; 59 oop Universe::_short_mirror = NULL; 60 oop Universe::_void_mirror = NULL; 61 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 62 oop Universe::_main_thread_group = NULL; 63 oop Universe::_system_thread_group = NULL; 64 typeArrayOop Universe::_the_empty_byte_array = NULL; 65 typeArrayOop Universe::_the_empty_short_array = NULL; 66 typeArrayOop Universe::_the_empty_int_array = NULL; 67 objArrayOop Universe::_the_empty_system_obj_array = NULL; 68 objArrayOop Universe::_the_empty_class_klass_array = NULL; 69 objArrayOop Universe::_the_array_interfaces_array = NULL; 70 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL; 71 LatestMethodOopCache* Universe::_loader_addClass_cache = NULL; 72 ActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL; 73 oop Universe::_out_of_memory_error_java_heap = NULL; 74 oop Universe::_out_of_memory_error_perm_gen = NULL; 75 oop Universe::_out_of_memory_error_array_size = NULL; 76 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 77 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 78 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 79 bool Universe::_verify_in_progress = false; 80 oop Universe::_null_ptr_exception_instance = NULL; 81 oop Universe::_arithmetic_exception_instance = NULL; 82 oop Universe::_virtual_machine_error_instance = NULL; 83 oop Universe::_vm_exception = NULL; 84 oop Universe::_emptySymbol = NULL; 85 86 // These variables are guarded by FullGCALot_lock. 87 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 88 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 89 90 91 // Heap 92 int Universe::_verify_count = 0; 93 94 int Universe::_base_vtable_size = 0; 95 bool Universe::_bootstrapping = false; 96 bool Universe::_fully_initialized = false; 97 98 size_t Universe::_heap_capacity_at_last_gc; 99 size_t Universe::_heap_used_at_last_gc = 0; 100 101 CollectedHeap* Universe::_collectedHeap = NULL; 102 103 NarrowOopStruct Universe::_narrow_oop = { NULL, 0, true }; 104 105 106 void Universe::basic_type_classes_do(void f(klassOop)) { 107 f(boolArrayKlassObj()); 108 f(byteArrayKlassObj()); 109 f(charArrayKlassObj()); 110 f(intArrayKlassObj()); 111 f(shortArrayKlassObj()); 112 f(longArrayKlassObj()); 113 f(singleArrayKlassObj()); 114 f(doubleArrayKlassObj()); 115 } 116 117 118 void Universe::system_classes_do(void f(klassOop)) { 119 f(symbolKlassObj()); 120 f(methodKlassObj()); 121 f(constMethodKlassObj()); 122 f(methodDataKlassObj()); 123 f(klassKlassObj()); 124 f(arrayKlassKlassObj()); 125 f(objArrayKlassKlassObj()); 126 f(typeArrayKlassKlassObj()); 127 f(instanceKlassKlassObj()); 128 f(constantPoolKlassObj()); 129 f(systemObjArrayKlassObj()); 130 } 131 132 void Universe::oops_do(OopClosure* f, bool do_all) { 133 134 f->do_oop((oop*) &_int_mirror); 135 f->do_oop((oop*) &_float_mirror); 136 f->do_oop((oop*) &_double_mirror); 137 f->do_oop((oop*) &_byte_mirror); 138 f->do_oop((oop*) &_bool_mirror); 139 f->do_oop((oop*) &_char_mirror); 140 f->do_oop((oop*) &_long_mirror); 141 f->do_oop((oop*) &_short_mirror); 142 f->do_oop((oop*) &_void_mirror); 143 144 // It's important to iterate over these guys even if they are null, 145 // since that's how shared heaps are restored. 146 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 147 f->do_oop((oop*) &_mirrors[i]); 148 } 149 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 150 151 // %%% Consider moving those "shared oops" over here with the others. 152 f->do_oop((oop*)&_boolArrayKlassObj); 153 f->do_oop((oop*)&_byteArrayKlassObj); 154 f->do_oop((oop*)&_charArrayKlassObj); 155 f->do_oop((oop*)&_intArrayKlassObj); 156 f->do_oop((oop*)&_shortArrayKlassObj); 157 f->do_oop((oop*)&_longArrayKlassObj); 158 f->do_oop((oop*)&_singleArrayKlassObj); 159 f->do_oop((oop*)&_doubleArrayKlassObj); 160 f->do_oop((oop*)&_objectArrayKlassObj); 161 { 162 for (int i = 0; i < T_VOID+1; i++) { 163 if (_typeArrayKlassObjs[i] != NULL) { 164 assert(i >= T_BOOLEAN, "checking"); 165 f->do_oop((oop*)&_typeArrayKlassObjs[i]); 166 } else if (do_all) { 167 f->do_oop((oop*)&_typeArrayKlassObjs[i]); 168 } 169 } 170 } 171 f->do_oop((oop*)&_symbolKlassObj); 172 f->do_oop((oop*)&_methodKlassObj); 173 f->do_oop((oop*)&_constMethodKlassObj); 174 f->do_oop((oop*)&_methodDataKlassObj); 175 f->do_oop((oop*)&_klassKlassObj); 176 f->do_oop((oop*)&_arrayKlassKlassObj); 177 f->do_oop((oop*)&_objArrayKlassKlassObj); 178 f->do_oop((oop*)&_typeArrayKlassKlassObj); 179 f->do_oop((oop*)&_instanceKlassKlassObj); 180 f->do_oop((oop*)&_constantPoolKlassObj); 181 f->do_oop((oop*)&_constantPoolCacheKlassObj); 182 f->do_oop((oop*)&_compiledICHolderKlassObj); 183 f->do_oop((oop*)&_systemObjArrayKlassObj); 184 f->do_oop((oop*)&_the_empty_byte_array); 185 f->do_oop((oop*)&_the_empty_short_array); 186 f->do_oop((oop*)&_the_empty_int_array); 187 f->do_oop((oop*)&_the_empty_system_obj_array); 188 f->do_oop((oop*)&_the_empty_class_klass_array); 189 f->do_oop((oop*)&_the_array_interfaces_array); 190 _finalizer_register_cache->oops_do(f); 191 _loader_addClass_cache->oops_do(f); 192 _reflect_invoke_cache->oops_do(f); 193 f->do_oop((oop*)&_out_of_memory_error_java_heap); 194 f->do_oop((oop*)&_out_of_memory_error_perm_gen); 195 f->do_oop((oop*)&_out_of_memory_error_array_size); 196 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 197 if (_preallocated_out_of_memory_error_array != (oop)NULL) { // NULL when DumpSharedSpaces 198 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 199 } 200 f->do_oop((oop*)&_null_ptr_exception_instance); 201 f->do_oop((oop*)&_arithmetic_exception_instance); 202 f->do_oop((oop*)&_virtual_machine_error_instance); 203 f->do_oop((oop*)&_main_thread_group); 204 f->do_oop((oop*)&_system_thread_group); 205 f->do_oop((oop*)&_vm_exception); 206 f->do_oop((oop*)&_emptySymbol); 207 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 208 } 209 210 211 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 212 if (size < alignment || size % alignment != 0) { 213 ResourceMark rm; 214 stringStream st; 215 st.print("Size of %s (%ld bytes) must be aligned to %ld bytes", name, size, alignment); 216 char* error = st.as_string(); 217 vm_exit_during_initialization(error); 218 } 219 } 220 221 222 void Universe::genesis(TRAPS) { 223 ResourceMark rm; 224 { FlagSetting fs(_bootstrapping, true); 225 226 { MutexLocker mc(Compile_lock); 227 228 // determine base vtable size; without that we cannot create the array klasses 229 compute_base_vtable_size(); 230 231 if (!UseSharedSpaces) { 232 _klassKlassObj = klassKlass::create_klass(CHECK); 233 _arrayKlassKlassObj = arrayKlassKlass::create_klass(CHECK); 234 235 _objArrayKlassKlassObj = objArrayKlassKlass::create_klass(CHECK); 236 _instanceKlassKlassObj = instanceKlassKlass::create_klass(CHECK); 237 _typeArrayKlassKlassObj = typeArrayKlassKlass::create_klass(CHECK); 238 239 _symbolKlassObj = symbolKlass::create_klass(CHECK); 240 241 _emptySymbol = oopFactory::new_symbol("", CHECK); 242 243 _boolArrayKlassObj = typeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 244 _charArrayKlassObj = typeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 245 _singleArrayKlassObj = typeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 246 _doubleArrayKlassObj = typeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 247 _byteArrayKlassObj = typeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 248 _shortArrayKlassObj = typeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 249 _intArrayKlassObj = typeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 250 _longArrayKlassObj = typeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 251 252 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 253 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 254 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 255 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 256 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 257 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 258 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 259 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 260 261 _methodKlassObj = methodKlass::create_klass(CHECK); 262 _constMethodKlassObj = constMethodKlass::create_klass(CHECK); 263 _methodDataKlassObj = methodDataKlass::create_klass(CHECK); 264 _constantPoolKlassObj = constantPoolKlass::create_klass(CHECK); 265 _constantPoolCacheKlassObj = constantPoolCacheKlass::create_klass(CHECK); 266 267 _compiledICHolderKlassObj = compiledICHolderKlass::create_klass(CHECK); 268 _systemObjArrayKlassObj = objArrayKlassKlass::cast(objArrayKlassKlassObj())->allocate_system_objArray_klass(CHECK); 269 270 _the_empty_byte_array = oopFactory::new_permanent_byteArray(0, CHECK); 271 _the_empty_short_array = oopFactory::new_permanent_shortArray(0, CHECK); 272 _the_empty_int_array = oopFactory::new_permanent_intArray(0, CHECK); 273 _the_empty_system_obj_array = oopFactory::new_system_objArray(0, CHECK); 274 275 _the_array_interfaces_array = oopFactory::new_system_objArray(2, CHECK); 276 _vm_exception = oopFactory::new_symbol("vm exception holder", CHECK); 277 } else { 278 FileMapInfo *mapinfo = FileMapInfo::current_info(); 279 char* buffer = mapinfo->region_base(CompactingPermGenGen::md); 280 void** vtbl_list = (void**)buffer; 281 init_self_patching_vtbl_list(vtbl_list, 282 CompactingPermGenGen::vtbl_list_size); 283 } 284 } 285 286 vmSymbols::initialize(CHECK); 287 288 SystemDictionary::initialize(CHECK); 289 290 klassOop ok = SystemDictionary::object_klass(); 291 292 if (UseSharedSpaces) { 293 // Verify shared interfaces array. 294 assert(_the_array_interfaces_array->obj_at(0) == 295 SystemDictionary::cloneable_klass(), "u3"); 296 assert(_the_array_interfaces_array->obj_at(1) == 297 SystemDictionary::serializable_klass(), "u3"); 298 299 // Verify element klass for system obj array klass 300 assert(objArrayKlass::cast(_systemObjArrayKlassObj)->element_klass() == ok, "u1"); 301 assert(objArrayKlass::cast(_systemObjArrayKlassObj)->bottom_klass() == ok, "u2"); 302 303 // Verify super class for the classes created above 304 assert(Klass::cast(boolArrayKlassObj() )->super() == ok, "u3"); 305 assert(Klass::cast(charArrayKlassObj() )->super() == ok, "u3"); 306 assert(Klass::cast(singleArrayKlassObj() )->super() == ok, "u3"); 307 assert(Klass::cast(doubleArrayKlassObj() )->super() == ok, "u3"); 308 assert(Klass::cast(byteArrayKlassObj() )->super() == ok, "u3"); 309 assert(Klass::cast(shortArrayKlassObj() )->super() == ok, "u3"); 310 assert(Klass::cast(intArrayKlassObj() )->super() == ok, "u3"); 311 assert(Klass::cast(longArrayKlassObj() )->super() == ok, "u3"); 312 assert(Klass::cast(constantPoolKlassObj() )->super() == ok, "u3"); 313 assert(Klass::cast(systemObjArrayKlassObj())->super() == ok, "u3"); 314 } else { 315 // Set up shared interfaces array. (Do this before supers are set up.) 316 _the_array_interfaces_array->obj_at_put(0, SystemDictionary::cloneable_klass()); 317 _the_array_interfaces_array->obj_at_put(1, SystemDictionary::serializable_klass()); 318 319 // Set element klass for system obj array klass 320 objArrayKlass::cast(_systemObjArrayKlassObj)->set_element_klass(ok); 321 objArrayKlass::cast(_systemObjArrayKlassObj)->set_bottom_klass(ok); 322 323 // Set super class for the classes created above 324 Klass::cast(boolArrayKlassObj() )->initialize_supers(ok, CHECK); 325 Klass::cast(charArrayKlassObj() )->initialize_supers(ok, CHECK); 326 Klass::cast(singleArrayKlassObj() )->initialize_supers(ok, CHECK); 327 Klass::cast(doubleArrayKlassObj() )->initialize_supers(ok, CHECK); 328 Klass::cast(byteArrayKlassObj() )->initialize_supers(ok, CHECK); 329 Klass::cast(shortArrayKlassObj() )->initialize_supers(ok, CHECK); 330 Klass::cast(intArrayKlassObj() )->initialize_supers(ok, CHECK); 331 Klass::cast(longArrayKlassObj() )->initialize_supers(ok, CHECK); 332 Klass::cast(constantPoolKlassObj() )->initialize_supers(ok, CHECK); 333 Klass::cast(systemObjArrayKlassObj())->initialize_supers(ok, CHECK); 334 Klass::cast(boolArrayKlassObj() )->set_super(ok); 335 Klass::cast(charArrayKlassObj() )->set_super(ok); 336 Klass::cast(singleArrayKlassObj() )->set_super(ok); 337 Klass::cast(doubleArrayKlassObj() )->set_super(ok); 338 Klass::cast(byteArrayKlassObj() )->set_super(ok); 339 Klass::cast(shortArrayKlassObj() )->set_super(ok); 340 Klass::cast(intArrayKlassObj() )->set_super(ok); 341 Klass::cast(longArrayKlassObj() )->set_super(ok); 342 Klass::cast(constantPoolKlassObj() )->set_super(ok); 343 Klass::cast(systemObjArrayKlassObj())->set_super(ok); 344 } 345 346 Klass::cast(boolArrayKlassObj() )->append_to_sibling_list(); 347 Klass::cast(charArrayKlassObj() )->append_to_sibling_list(); 348 Klass::cast(singleArrayKlassObj() )->append_to_sibling_list(); 349 Klass::cast(doubleArrayKlassObj() )->append_to_sibling_list(); 350 Klass::cast(byteArrayKlassObj() )->append_to_sibling_list(); 351 Klass::cast(shortArrayKlassObj() )->append_to_sibling_list(); 352 Klass::cast(intArrayKlassObj() )->append_to_sibling_list(); 353 Klass::cast(longArrayKlassObj() )->append_to_sibling_list(); 354 Klass::cast(constantPoolKlassObj() )->append_to_sibling_list(); 355 Klass::cast(systemObjArrayKlassObj())->append_to_sibling_list(); 356 } // end of core bootstrapping 357 358 // Initialize _objectArrayKlass after core bootstraping to make 359 // sure the super class is set up properly for _objectArrayKlass. 360 _objectArrayKlassObj = instanceKlass:: 361 cast(SystemDictionary::object_klass())->array_klass(1, CHECK); 362 // Add the class to the class hierarchy manually to make sure that 363 // its vtable is initialized after core bootstrapping is completed. 364 Klass::cast(_objectArrayKlassObj)->append_to_sibling_list(); 365 366 // Compute is_jdk version flags. 367 // Only 1.3 or later has the java.lang.Shutdown class. 368 // Only 1.4 or later has the java.lang.CharSequence interface. 369 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 370 if (JDK_Version::is_partially_initialized()) { 371 uint8_t jdk_version; 372 klassOop k = SystemDictionary::resolve_or_null( 373 vmSymbolHandles::java_lang_management_MemoryUsage(), THREAD); 374 CLEAR_PENDING_EXCEPTION; // ignore exceptions 375 if (k == NULL) { 376 k = SystemDictionary::resolve_or_null( 377 vmSymbolHandles::java_lang_CharSequence(), THREAD); 378 CLEAR_PENDING_EXCEPTION; // ignore exceptions 379 if (k == NULL) { 380 k = SystemDictionary::resolve_or_null( 381 vmSymbolHandles::java_lang_Shutdown(), THREAD); 382 CLEAR_PENDING_EXCEPTION; // ignore exceptions 383 if (k == NULL) { 384 jdk_version = 2; 385 } else { 386 jdk_version = 3; 387 } 388 } else { 389 jdk_version = 4; 390 } 391 } else { 392 jdk_version = 5; 393 } 394 JDK_Version::fully_initialize(jdk_version); 395 } 396 397 #ifdef ASSERT 398 if (FullGCALot) { 399 // Allocate an array of dummy objects. 400 // We'd like these to be at the bottom of the old generation, 401 // so that when we free one and then collect, 402 // (almost) the whole heap moves 403 // and we find out if we actually update all the oops correctly. 404 // But we can't allocate directly in the old generation, 405 // so we allocate wherever, and hope that the first collection 406 // moves these objects to the bottom of the old generation. 407 // We can allocate directly in the permanent generation, so we do. 408 int size; 409 if (UseConcMarkSweepGC) { 410 warning("Using +FullGCALot with concurrent mark sweep gc " 411 "will not force all objects to relocate"); 412 size = FullGCALotDummies; 413 } else { 414 size = FullGCALotDummies * 2; 415 } 416 objArrayOop naked_array = oopFactory::new_system_objArray(size, CHECK); 417 objArrayHandle dummy_array(THREAD, naked_array); 418 int i = 0; 419 while (i < size) { 420 if (!UseConcMarkSweepGC) { 421 // Allocate dummy in old generation 422 oop dummy = instanceKlass::cast(SystemDictionary::object_klass())->allocate_instance(CHECK); 423 dummy_array->obj_at_put(i++, dummy); 424 } 425 // Allocate dummy in permanent generation 426 oop dummy = instanceKlass::cast(SystemDictionary::object_klass())->allocate_permanent_instance(CHECK); 427 dummy_array->obj_at_put(i++, dummy); 428 } 429 { 430 // Only modify the global variable inside the mutex. 431 // If we had a race to here, the other dummy_array instances 432 // and their elements just get dropped on the floor, which is fine. 433 MutexLocker ml(FullGCALot_lock); 434 if (_fullgc_alot_dummy_array == NULL) { 435 _fullgc_alot_dummy_array = dummy_array(); 436 } 437 } 438 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 439 } 440 #endif 441 } 442 443 444 static inline void add_vtable(void** list, int* n, Klass* o, int count) { 445 list[(*n)++] = *(void**)&o->vtbl_value(); 446 guarantee((*n) <= count, "vtable list too small."); 447 } 448 449 450 void Universe::init_self_patching_vtbl_list(void** list, int count) { 451 int n = 0; 452 { klassKlass o; add_vtable(list, &n, &o, count); } 453 { arrayKlassKlass o; add_vtable(list, &n, &o, count); } 454 { objArrayKlassKlass o; add_vtable(list, &n, &o, count); } 455 { instanceKlassKlass o; add_vtable(list, &n, &o, count); } 456 { instanceKlass o; add_vtable(list, &n, &o, count); } 457 { instanceRefKlass o; add_vtable(list, &n, &o, count); } 458 { typeArrayKlassKlass o; add_vtable(list, &n, &o, count); } 459 { symbolKlass o; add_vtable(list, &n, &o, count); } 460 { typeArrayKlass o; add_vtable(list, &n, &o, count); } 461 { methodKlass o; add_vtable(list, &n, &o, count); } 462 { constMethodKlass o; add_vtable(list, &n, &o, count); } 463 { constantPoolKlass o; add_vtable(list, &n, &o, count); } 464 { constantPoolCacheKlass o; add_vtable(list, &n, &o, count); } 465 { objArrayKlass o; add_vtable(list, &n, &o, count); } 466 { methodDataKlass o; add_vtable(list, &n, &o, count); } 467 { compiledICHolderKlass o; add_vtable(list, &n, &o, count); } 468 } 469 470 471 class FixupMirrorClosure: public ObjectClosure { 472 public: 473 virtual void do_object(oop obj) { 474 if (obj->is_klass()) { 475 EXCEPTION_MARK; 476 KlassHandle k(THREAD, klassOop(obj)); 477 // We will never reach the CATCH below since Exceptions::_throw will cause 478 // the VM to exit if an exception is thrown during initialization 479 java_lang_Class::create_mirror(k, CATCH); 480 // This call unconditionally creates a new mirror for k, 481 // and links in k's component_mirror field if k is an array. 482 // If k is an objArray, k's element type must already have 483 // a mirror. In other words, this closure must process 484 // the component type of an objArray k before it processes k. 485 // This works because the permgen iterator presents arrays 486 // and their component types in order of creation. 487 } 488 } 489 }; 490 491 void Universe::initialize_basic_type_mirrors(TRAPS) { 492 if (UseSharedSpaces) { 493 assert(_int_mirror != NULL, "already loaded"); 494 assert(_void_mirror == _mirrors[T_VOID], "consistently loaded"); 495 } else { 496 497 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 498 _int_mirror = 499 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 500 _float_mirror = 501 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 502 _double_mirror = 503 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 504 _byte_mirror = 505 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 506 _bool_mirror = 507 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 508 _char_mirror = 509 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 510 _long_mirror = 511 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 512 _short_mirror = 513 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 514 _void_mirror = 515 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 516 517 _mirrors[T_INT] = _int_mirror; 518 _mirrors[T_FLOAT] = _float_mirror; 519 _mirrors[T_DOUBLE] = _double_mirror; 520 _mirrors[T_BYTE] = _byte_mirror; 521 _mirrors[T_BOOLEAN] = _bool_mirror; 522 _mirrors[T_CHAR] = _char_mirror; 523 _mirrors[T_LONG] = _long_mirror; 524 _mirrors[T_SHORT] = _short_mirror; 525 _mirrors[T_VOID] = _void_mirror; 526 //_mirrors[T_OBJECT] = instanceKlass::cast(_object_klass)->java_mirror(); 527 //_mirrors[T_ARRAY] = instanceKlass::cast(_object_klass)->java_mirror(); 528 } 529 } 530 531 void Universe::fixup_mirrors(TRAPS) { 532 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 533 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 534 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 535 // that the number of objects allocated at this point is very small. 536 assert(SystemDictionary::class_klass_loaded(), "java.lang.Class should be loaded"); 537 FixupMirrorClosure blk; 538 Universe::heap()->permanent_object_iterate(&blk); 539 } 540 541 542 static bool has_run_finalizers_on_exit = false; 543 544 void Universe::run_finalizers_on_exit() { 545 if (has_run_finalizers_on_exit) return; 546 has_run_finalizers_on_exit = true; 547 548 // Called on VM exit. This ought to be run in a separate thread. 549 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 550 { 551 PRESERVE_EXCEPTION_MARK; 552 KlassHandle finalizer_klass(THREAD, SystemDictionary::finalizer_klass()); 553 JavaValue result(T_VOID); 554 JavaCalls::call_static( 555 &result, 556 finalizer_klass, 557 vmSymbolHandles::run_finalizers_on_exit_name(), 558 vmSymbolHandles::void_method_signature(), 559 THREAD 560 ); 561 // Ignore any pending exceptions 562 CLEAR_PENDING_EXCEPTION; 563 } 564 } 565 566 567 // initialize_vtable could cause gc if 568 // 1) we specified true to initialize_vtable and 569 // 2) this ran after gc was enabled 570 // In case those ever change we use handles for oops 571 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 572 // init vtable of k and all subclasses 573 Klass* ko = k_h()->klass_part(); 574 klassVtable* vt = ko->vtable(); 575 if (vt) vt->initialize_vtable(false, CHECK); 576 if (ko->oop_is_instance()) { 577 instanceKlass* ik = (instanceKlass*)ko; 578 for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->klass_part()->next_sibling())) { 579 reinitialize_vtable_of(s_h, CHECK); 580 } 581 } 582 } 583 584 585 void initialize_itable_for_klass(klassOop k, TRAPS) { 586 instanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 587 } 588 589 590 void Universe::reinitialize_itables(TRAPS) { 591 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 592 593 } 594 595 596 bool Universe::on_page_boundary(void* addr) { 597 return ((uintptr_t) addr) % os::vm_page_size() == 0; 598 } 599 600 601 bool Universe::should_fill_in_stack_trace(Handle throwable) { 602 // never attempt to fill in the stack trace of preallocated errors that do not have 603 // backtrace. These errors are kept alive forever and may be "re-used" when all 604 // preallocated errors with backtrace have been consumed. Also need to avoid 605 // a potential loop which could happen if an out of memory occurs when attempting 606 // to allocate the backtrace. 607 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 608 (throwable() != Universe::_out_of_memory_error_perm_gen) && 609 (throwable() != Universe::_out_of_memory_error_array_size) && 610 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); 611 } 612 613 614 oop Universe::gen_out_of_memory_error(oop default_err) { 615 // generate an out of memory error: 616 // - if there is a preallocated error with backtrace available then return it wth 617 // a filled in stack trace. 618 // - if there are no preallocated errors with backtrace available then return 619 // an error without backtrace. 620 int next; 621 if (_preallocated_out_of_memory_error_avail_count > 0) { 622 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 623 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 624 } else { 625 next = -1; 626 } 627 if (next < 0) { 628 // all preallocated errors have been used. 629 // return default 630 return default_err; 631 } else { 632 // get the error object at the slot and set set it to NULL so that the 633 // array isn't keeping it alive anymore. 634 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 635 assert(exc != NULL, "slot has been used already"); 636 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 637 638 // use the message from the default error 639 oop msg = java_lang_Throwable::message(default_err); 640 assert(msg != NULL, "no message"); 641 java_lang_Throwable::set_message(exc, msg); 642 643 // populate the stack trace and return it. 644 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 645 return exc; 646 } 647 } 648 649 static intptr_t non_oop_bits = 0; 650 651 void* Universe::non_oop_word() { 652 // Neither the high bits nor the low bits of this value is allowed 653 // to look like (respectively) the high or low bits of a real oop. 654 // 655 // High and low are CPU-specific notions, but low always includes 656 // the low-order bit. Since oops are always aligned at least mod 4, 657 // setting the low-order bit will ensure that the low half of the 658 // word will never look like that of a real oop. 659 // 660 // Using the OS-supplied non-memory-address word (usually 0 or -1) 661 // will take care of the high bits, however many there are. 662 663 if (non_oop_bits == 0) { 664 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 665 } 666 667 return (void*)non_oop_bits; 668 } 669 670 jint universe_init() { 671 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 672 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 673 "LogHeapWordSize is incorrect."); 674 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 675 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 676 "oop size is not not a multiple of HeapWord size"); 677 TraceTime timer("Genesis", TraceStartupTime); 678 GC_locker::lock(); // do not allow gc during bootstrapping 679 JavaClasses::compute_hard_coded_offsets(); 680 681 // Get map info from shared archive file. 682 if (DumpSharedSpaces) 683 UseSharedSpaces = false; 684 685 FileMapInfo* mapinfo = NULL; 686 if (UseSharedSpaces) { 687 mapinfo = NEW_C_HEAP_OBJ(FileMapInfo); 688 memset(mapinfo, 0, sizeof(FileMapInfo)); 689 690 // Open the shared archive file, read and validate the header. If 691 // initialization files, shared spaces [UseSharedSpaces] are 692 // disabled and the file is closed. 693 694 if (mapinfo->initialize()) { 695 FileMapInfo::set_current_info(mapinfo); 696 } else { 697 assert(!mapinfo->is_open() && !UseSharedSpaces, 698 "archive file not closed or shared spaces not disabled."); 699 } 700 } 701 702 jint status = Universe::initialize_heap(); 703 if (status != JNI_OK) { 704 return status; 705 } 706 707 // We have a heap so create the methodOop caches before 708 // CompactingPermGenGen::initialize_oops() tries to populate them. 709 Universe::_finalizer_register_cache = new LatestMethodOopCache(); 710 Universe::_loader_addClass_cache = new LatestMethodOopCache(); 711 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache(); 712 713 if (UseSharedSpaces) { 714 715 // Read the data structures supporting the shared spaces (shared 716 // system dictionary, symbol table, etc.). After that, access to 717 // the file (other than the mapped regions) is no longer needed, and 718 // the file is closed. Closing the file does not affect the 719 // currently mapped regions. 720 721 CompactingPermGenGen::initialize_oops(); 722 mapinfo->close(); 723 724 } else { 725 SymbolTable::create_table(); 726 StringTable::create_table(); 727 ClassLoader::create_package_info_table(); 728 } 729 730 return JNI_OK; 731 } 732 733 // Choose the heap base address and oop encoding mode 734 // when compressed oops are used: 735 // Unscaled - Use 32-bits oops without encoding when 736 // NarrowOopHeapBaseMin + heap_size < 4Gb 737 // ZeroBased - Use zero based compressed oops with encoding when 738 // NarrowOopHeapBaseMin + heap_size < 32Gb 739 // HeapBased - Use compressed oops with heap base + encoding. 740 741 // 4Gb 742 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); 743 // 32Gb 744 static const uint64_t OopEncodingHeapMax = NarrowOopHeapMax << LogMinObjAlignmentInBytes; 745 746 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { 747 size_t base = 0; 748 #ifdef _LP64 749 if (UseCompressedOops) { 750 assert(mode == UnscaledNarrowOop || 751 mode == ZeroBasedNarrowOop || 752 mode == HeapBasedNarrowOop, "mode is invalid"); 753 const size_t total_size = heap_size + HeapBaseMinAddress; 754 // Return specified base for the first request. 755 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { 756 base = HeapBaseMinAddress; 757 } else if (total_size <= OopEncodingHeapMax && (mode != HeapBasedNarrowOop)) { 758 if (total_size <= NarrowOopHeapMax && (mode == UnscaledNarrowOop) && 759 (Universe::narrow_oop_shift() == 0)) { 760 // Use 32-bits oops without encoding and 761 // place heap's top on the 4Gb boundary 762 base = (NarrowOopHeapMax - heap_size); 763 } else { 764 // Can't reserve with NarrowOopShift == 0 765 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 766 if (mode == UnscaledNarrowOop || 767 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { 768 // Use zero based compressed oops with encoding and 769 // place heap's top on the 32Gb boundary in case 770 // total_size > 4Gb or failed to reserve below 4Gb. 771 base = (OopEncodingHeapMax - heap_size); 772 } 773 } 774 } else { 775 // Can't reserve below 32Gb. 776 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 777 } 778 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks 779 // used in ReservedHeapSpace() constructors. 780 // The final values will be set in initialize_heap() below. 781 if (base != 0 && (base + heap_size) <= OopEncodingHeapMax) { 782 // Use zero based compressed oops 783 Universe::set_narrow_oop_base(NULL); 784 // Don't need guard page for implicit checks in indexed 785 // addressing mode with zero based Compressed Oops. 786 Universe::set_narrow_oop_use_implicit_null_checks(true); 787 } else { 788 // Set not NULL value to indicate the need of narrow_oop_base. 789 // The final value will be set in initialize_heap() below. 790 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); 791 #ifdef _WIN64 792 if (UseLargePages) { 793 // Cannot allocate guard pages for implicit checks in indexed 794 // addressing mode, when large pages are specified on windows. 795 Universe::set_narrow_oop_use_implicit_null_checks(false); 796 } 797 #endif // _WIN64 798 } 799 } 800 #endif 801 return (char*)base; // also return NULL (don't care) for 32-bit VM 802 } 803 804 jint Universe::initialize_heap() { 805 806 if (UseParallelGC) { 807 #ifndef SERIALGC 808 Universe::_collectedHeap = new ParallelScavengeHeap(); 809 #else // SERIALGC 810 fatal("UseParallelGC not supported in java kernel vm."); 811 #endif // SERIALGC 812 813 } else if (UseG1GC) { 814 #ifndef SERIALGC 815 G1CollectorPolicy* g1p = new G1CollectorPolicy_BestRegionsFirst(); 816 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); 817 Universe::_collectedHeap = g1h; 818 #else // SERIALGC 819 fatal("UseG1GC not supported in java kernel vm."); 820 #endif // SERIALGC 821 822 } else { 823 GenCollectorPolicy *gc_policy; 824 825 if (UseSerialGC) { 826 gc_policy = new MarkSweepPolicy(); 827 } else if (UseConcMarkSweepGC) { 828 #ifndef SERIALGC 829 if (UseAdaptiveSizePolicy) { 830 gc_policy = new ASConcurrentMarkSweepPolicy(); 831 } else { 832 gc_policy = new ConcurrentMarkSweepPolicy(); 833 } 834 #else // SERIALGC 835 fatal("UseConcMarkSweepGC not supported in java kernel vm."); 836 #endif // SERIALGC 837 } else { // default old generation 838 gc_policy = new MarkSweepPolicy(); 839 } 840 841 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); 842 } 843 844 jint status = Universe::heap()->initialize(); 845 if (status != JNI_OK) { 846 return status; 847 } 848 849 #ifdef _LP64 850 if (UseCompressedOops) { 851 // Subtract a page because something can get allocated at heap base. 852 // This also makes implicit null checking work, because the 853 // memory+1 page below heap_base needs to cause a signal. 854 // See needs_explicit_null_check. 855 // Only set the heap base for compressed oops because it indicates 856 // compressed oops for pstack code. 857 if (PrintCompressedOopsMode) { 858 tty->cr(); 859 tty->print("heap address: "PTR_FORMAT, Universe::heap()->base()); 860 } 861 if ((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) { 862 // Can't reserve heap below 32Gb. 863 Universe::set_narrow_oop_base(Universe::heap()->base() - os::vm_page_size()); 864 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 865 if (PrintCompressedOopsMode) { 866 tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base()); 867 } 868 } else { 869 Universe::set_narrow_oop_base(0); 870 if (PrintCompressedOopsMode) { 871 tty->print(", zero based Compressed Oops"); 872 } 873 #ifdef _WIN64 874 if (!Universe::narrow_oop_use_implicit_null_checks()) { 875 // Don't need guard page for implicit checks in indexed addressing 876 // mode with zero based Compressed Oops. 877 Universe::set_narrow_oop_use_implicit_null_checks(true); 878 } 879 #endif // _WIN64 880 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { 881 // Can't reserve heap below 4Gb. 882 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 883 } else { 884 Universe::set_narrow_oop_shift(0); 885 if (PrintCompressedOopsMode) { 886 tty->print(", 32-bits Oops"); 887 } 888 } 889 } 890 if (PrintCompressedOopsMode) { 891 tty->cr(); 892 tty->cr(); 893 } 894 } 895 assert(Universe::narrow_oop_base() == (Universe::heap()->base() - os::vm_page_size()) || 896 Universe::narrow_oop_base() == NULL, "invalid value"); 897 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 898 Universe::narrow_oop_shift() == 0, "invalid value"); 899 #endif 900 901 // We will never reach the CATCH below since Exceptions::_throw will cause 902 // the VM to exit if an exception is thrown during initialization 903 904 if (UseTLAB) { 905 assert(Universe::heap()->supports_tlab_allocation(), 906 "Should support thread-local allocation buffers"); 907 ThreadLocalAllocBuffer::startup_initialization(); 908 } 909 return JNI_OK; 910 } 911 912 // It's the caller's repsonsibility to ensure glitch-freedom 913 // (if required). 914 void Universe::update_heap_info_at_gc() { 915 _heap_capacity_at_last_gc = heap()->capacity(); 916 _heap_used_at_last_gc = heap()->used(); 917 } 918 919 920 921 void universe2_init() { 922 EXCEPTION_MARK; 923 Universe::genesis(CATCH); 924 // Although we'd like to verify here that the state of the heap 925 // is good, we can't because the main thread has not yet added 926 // itself to the threads list (so, using current interfaces 927 // we can't "fill" its TLAB), unless TLABs are disabled. 928 if (VerifyBeforeGC && !UseTLAB && 929 Universe::heap()->total_collections() >= VerifyGCStartAt) { 930 Universe::heap()->prepare_for_verify(); 931 Universe::verify(); // make sure we're starting with a clean slate 932 } 933 } 934 935 936 // This function is defined in JVM.cpp 937 extern void initialize_converter_functions(); 938 939 bool universe_post_init() { 940 Universe::_fully_initialized = true; 941 EXCEPTION_MARK; 942 { ResourceMark rm; 943 Interpreter::initialize(); // needed for interpreter entry points 944 if (!UseSharedSpaces) { 945 KlassHandle ok_h(THREAD, SystemDictionary::object_klass()); 946 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 947 Universe::reinitialize_itables(CHECK_false); 948 } 949 } 950 951 klassOop k; 952 instanceKlassHandle k_h; 953 if (!UseSharedSpaces) { 954 // Setup preallocated empty java.lang.Class array 955 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::class_klass(), 0, CHECK_false); 956 // Setup preallocated OutOfMemoryError errors 957 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_OutOfMemoryError(), true, CHECK_false); 958 k_h = instanceKlassHandle(THREAD, k); 959 Universe::_out_of_memory_error_java_heap = k_h->allocate_permanent_instance(CHECK_false); 960 Universe::_out_of_memory_error_perm_gen = k_h->allocate_permanent_instance(CHECK_false); 961 Universe::_out_of_memory_error_array_size = k_h->allocate_permanent_instance(CHECK_false); 962 Universe::_out_of_memory_error_gc_overhead_limit = 963 k_h->allocate_permanent_instance(CHECK_false); 964 965 // Setup preallocated NullPointerException 966 // (this is currently used for a cheap & dirty solution in compiler exception handling) 967 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_NullPointerException(), true, CHECK_false); 968 Universe::_null_ptr_exception_instance = instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); 969 // Setup preallocated ArithmeticException 970 // (this is currently used for a cheap & dirty solution in compiler exception handling) 971 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_ArithmeticException(), true, CHECK_false); 972 Universe::_arithmetic_exception_instance = instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); 973 // Virtual Machine Error for when we get into a situation we can't resolve 974 k = SystemDictionary::resolve_or_fail( 975 vmSymbolHandles::java_lang_VirtualMachineError(), true, CHECK_false); 976 bool linked = instanceKlass::cast(k)->link_class_or_fail(CHECK_false); 977 if (!linked) { 978 tty->print_cr("Unable to link/verify VirtualMachineError class"); 979 return false; // initialization failed 980 } 981 Universe::_virtual_machine_error_instance = 982 instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); 983 } 984 if (!DumpSharedSpaces) { 985 // These are the only Java fields that are currently set during shared space dumping. 986 // We prefer to not handle this generally, so we always reinitialize these detail messages. 987 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 988 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 989 990 msg = java_lang_String::create_from_str("PermGen space", CHECK_false); 991 java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg()); 992 993 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 994 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 995 996 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 997 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 998 999 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1000 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1001 1002 // Setup the array of errors that have preallocated backtrace 1003 k = Universe::_out_of_memory_error_java_heap->klass(); 1004 assert(k->klass_part()->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1005 k_h = instanceKlassHandle(THREAD, k); 1006 1007 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1008 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 1009 for (int i=0; i<len; i++) { 1010 oop err = k_h->allocate_permanent_instance(CHECK_false); 1011 Handle err_h = Handle(THREAD, err); 1012 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1013 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1014 } 1015 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1016 } 1017 1018 1019 // Setup static method for registering finalizers 1020 // The finalizer klass must be linked before looking up the method, in 1021 // case it needs to get rewritten. 1022 instanceKlass::cast(SystemDictionary::finalizer_klass())->link_class(CHECK_false); 1023 methodOop m = instanceKlass::cast(SystemDictionary::finalizer_klass())->find_method( 1024 vmSymbols::register_method_name(), 1025 vmSymbols::register_method_signature()); 1026 if (m == NULL || !m->is_static()) { 1027 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1028 "java.lang.ref.Finalizer.register", false); 1029 } 1030 Universe::_finalizer_register_cache->init( 1031 SystemDictionary::finalizer_klass(), m, CHECK_false); 1032 1033 // Resolve on first use and initialize class. 1034 // Note: No race-condition here, since a resolve will always return the same result 1035 1036 // Setup method for security checks 1037 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_reflect_Method(), true, CHECK_false); 1038 k_h = instanceKlassHandle(THREAD, k); 1039 k_h->link_class(CHECK_false); 1040 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_array_object_object_signature()); 1041 if (m == NULL || m->is_static()) { 1042 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1043 "java.lang.reflect.Method.invoke", false); 1044 } 1045 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); 1046 1047 // Setup method for registering loaded classes in class loader vector 1048 instanceKlass::cast(SystemDictionary::classloader_klass())->link_class(CHECK_false); 1049 m = instanceKlass::cast(SystemDictionary::classloader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1050 if (m == NULL || m->is_static()) { 1051 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1052 "java.lang.ClassLoader.addClass", false); 1053 } 1054 Universe::_loader_addClass_cache->init( 1055 SystemDictionary::classloader_klass(), m, CHECK_false); 1056 1057 // The folowing is initializing converter functions for serialization in 1058 // JVM.cpp. If we clean up the StrictMath code above we may want to find 1059 // a better solution for this as well. 1060 initialize_converter_functions(); 1061 1062 // This needs to be done before the first scavenge/gc, since 1063 // it's an input to soft ref clearing policy. 1064 { 1065 MutexLocker x(Heap_lock); 1066 Universe::update_heap_info_at_gc(); 1067 } 1068 1069 // ("weak") refs processing infrastructure initialization 1070 Universe::heap()->post_initialize(); 1071 1072 GC_locker::unlock(); // allow gc after bootstrapping 1073 1074 MemoryService::set_universe_heap(Universe::_collectedHeap); 1075 return true; 1076 } 1077 1078 1079 void Universe::compute_base_vtable_size() { 1080 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1081 } 1082 1083 1084 // %%% The Universe::flush_foo methods belong in CodeCache. 1085 1086 // Flushes compiled methods dependent on dependee. 1087 void Universe::flush_dependents_on(instanceKlassHandle dependee) { 1088 assert_lock_strong(Compile_lock); 1089 1090 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1091 1092 // CodeCache can only be updated by a thread_in_VM and they will all be 1093 // stopped dring the safepoint so CodeCache will be safe to update without 1094 // holding the CodeCache_lock. 1095 1096 DepChange changes(dependee); 1097 1098 // Compute the dependent nmethods 1099 if (CodeCache::mark_for_deoptimization(changes) > 0) { 1100 // At least one nmethod has been marked for deoptimization 1101 VM_Deoptimize op; 1102 VMThread::execute(&op); 1103 } 1104 } 1105 1106 #ifdef HOTSWAP 1107 // Flushes compiled methods dependent on dependee in the evolutionary sense 1108 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { 1109 // --- Compile_lock is not held. However we are at a safepoint. 1110 assert_locked_or_safepoint(Compile_lock); 1111 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1112 1113 // CodeCache can only be updated by a thread_in_VM and they will all be 1114 // stopped dring the safepoint so CodeCache will be safe to update without 1115 // holding the CodeCache_lock. 1116 1117 // Compute the dependent nmethods 1118 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { 1119 // At least one nmethod has been marked for deoptimization 1120 1121 // All this already happens inside a VM_Operation, so we'll do all the work here. 1122 // Stuff copied from VM_Deoptimize and modified slightly. 1123 1124 // We do not want any GCs to happen while we are in the middle of this VM operation 1125 ResourceMark rm; 1126 DeoptimizationMarker dm; 1127 1128 // Deoptimize all activations depending on marked nmethods 1129 Deoptimization::deoptimize_dependents(); 1130 1131 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1132 CodeCache::make_marked_nmethods_not_entrant(); 1133 } 1134 } 1135 #endif // HOTSWAP 1136 1137 1138 // Flushes compiled methods dependent on dependee 1139 void Universe::flush_dependents_on_method(methodHandle m_h) { 1140 // --- Compile_lock is not held. However we are at a safepoint. 1141 assert_locked_or_safepoint(Compile_lock); 1142 1143 // CodeCache can only be updated by a thread_in_VM and they will all be 1144 // stopped dring the safepoint so CodeCache will be safe to update without 1145 // holding the CodeCache_lock. 1146 1147 // Compute the dependent nmethods 1148 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { 1149 // At least one nmethod has been marked for deoptimization 1150 1151 // All this already happens inside a VM_Operation, so we'll do all the work here. 1152 // Stuff copied from VM_Deoptimize and modified slightly. 1153 1154 // We do not want any GCs to happen while we are in the middle of this VM operation 1155 ResourceMark rm; 1156 DeoptimizationMarker dm; 1157 1158 // Deoptimize all activations depending on marked nmethods 1159 Deoptimization::deoptimize_dependents(); 1160 1161 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1162 CodeCache::make_marked_nmethods_not_entrant(); 1163 } 1164 } 1165 1166 void Universe::print() { print_on(gclog_or_tty); } 1167 1168 void Universe::print_on(outputStream* st) { 1169 st->print_cr("Heap"); 1170 heap()->print_on(st); 1171 } 1172 1173 void Universe::print_heap_at_SIGBREAK() { 1174 if (PrintHeapAtSIGBREAK) { 1175 MutexLocker hl(Heap_lock); 1176 print_on(tty); 1177 tty->cr(); 1178 tty->flush(); 1179 } 1180 } 1181 1182 void Universe::print_heap_before_gc(outputStream* st) { 1183 st->print_cr("{Heap before GC invocations=%u (full %u):", 1184 heap()->total_collections(), 1185 heap()->total_full_collections()); 1186 heap()->print_on(st); 1187 } 1188 1189 void Universe::print_heap_after_gc(outputStream* st) { 1190 st->print_cr("Heap after GC invocations=%u (full %u):", 1191 heap()->total_collections(), 1192 heap()->total_full_collections()); 1193 heap()->print_on(st); 1194 st->print_cr("}"); 1195 } 1196 1197 void Universe::verify(bool allow_dirty, bool silent, bool option) { 1198 if (SharedSkipVerify) { 1199 return; 1200 } 1201 1202 // The use of _verify_in_progress is a temporary work around for 1203 // 6320749. Don't bother with a creating a class to set and clear 1204 // it since it is only used in this method and the control flow is 1205 // straight forward. 1206 _verify_in_progress = true; 1207 1208 COMPILER2_PRESENT( 1209 assert(!DerivedPointerTable::is_active(), 1210 "DPT should not be active during verification " 1211 "(of thread stacks below)"); 1212 ) 1213 1214 ResourceMark rm; 1215 HandleMark hm; // Handles created during verification can be zapped 1216 _verify_count++; 1217 1218 if (!silent) gclog_or_tty->print("[Verifying "); 1219 if (!silent) gclog_or_tty->print("threads "); 1220 Threads::verify(); 1221 heap()->verify(allow_dirty, silent, option); 1222 1223 if (!silent) gclog_or_tty->print("syms "); 1224 SymbolTable::verify(); 1225 if (!silent) gclog_or_tty->print("strs "); 1226 StringTable::verify(); 1227 { 1228 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1229 if (!silent) gclog_or_tty->print("zone "); 1230 CodeCache::verify(); 1231 } 1232 if (!silent) gclog_or_tty->print("dict "); 1233 SystemDictionary::verify(); 1234 if (!silent) gclog_or_tty->print("hand "); 1235 JNIHandles::verify(); 1236 if (!silent) gclog_or_tty->print("C-heap "); 1237 os::check_heap(); 1238 if (!silent) gclog_or_tty->print_cr("]"); 1239 1240 _verify_in_progress = false; 1241 } 1242 1243 // Oop verification (see MacroAssembler::verify_oop) 1244 1245 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1246 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1247 1248 1249 static void calculate_verify_data(uintptr_t verify_data[2], 1250 HeapWord* low_boundary, 1251 HeapWord* high_boundary) { 1252 assert(low_boundary < high_boundary, "bad interval"); 1253 1254 // decide which low-order bits we require to be clear: 1255 size_t alignSize = MinObjAlignmentInBytes; 1256 size_t min_object_size = oopDesc::header_size(); 1257 1258 // make an inclusive limit: 1259 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1260 uintptr_t min = (uintptr_t)low_boundary; 1261 assert(min < max, "bad interval"); 1262 uintptr_t diff = max ^ min; 1263 1264 // throw away enough low-order bits to make the diff vanish 1265 uintptr_t mask = (uintptr_t)(-1); 1266 while ((mask & diff) != 0) 1267 mask <<= 1; 1268 uintptr_t bits = (min & mask); 1269 assert(bits == (max & mask), "correct mask"); 1270 // check an intermediate value between min and max, just to make sure: 1271 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1272 1273 // require address alignment, too: 1274 mask |= (alignSize - 1); 1275 1276 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1277 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1278 } 1279 verify_data[0] = mask; 1280 verify_data[1] = bits; 1281 } 1282 1283 1284 // Oop verification (see MacroAssembler::verify_oop) 1285 #ifndef PRODUCT 1286 1287 uintptr_t Universe::verify_oop_mask() { 1288 MemRegion m = heap()->reserved_region(); 1289 calculate_verify_data(_verify_oop_data, 1290 m.start(), 1291 m.end()); 1292 return _verify_oop_data[0]; 1293 } 1294 1295 1296 1297 uintptr_t Universe::verify_oop_bits() { 1298 verify_oop_mask(); 1299 return _verify_oop_data[1]; 1300 } 1301 1302 1303 uintptr_t Universe::verify_klass_mask() { 1304 /* $$$ 1305 // A klass can never live in the new space. Since the new and old 1306 // spaces can change size, we must settle for bounds-checking against 1307 // the bottom of the world, plus the smallest possible new and old 1308 // space sizes that may arise during execution. 1309 size_t min_new_size = Universe::new_size(); // in bytes 1310 size_t min_old_size = Universe::old_size(); // in bytes 1311 calculate_verify_data(_verify_klass_data, 1312 (HeapWord*)((uintptr_t)_new_gen->low_boundary + min_new_size + min_old_size), 1313 _perm_gen->high_boundary); 1314 */ 1315 // Why doesn't the above just say that klass's always live in the perm 1316 // gen? I'll see if that seems to work... 1317 MemRegion permanent_reserved; 1318 switch (Universe::heap()->kind()) { 1319 default: 1320 // ???: What if a CollectedHeap doesn't have a permanent generation? 1321 ShouldNotReachHere(); 1322 break; 1323 case CollectedHeap::GenCollectedHeap: 1324 case CollectedHeap::G1CollectedHeap: { 1325 SharedHeap* sh = (SharedHeap*) Universe::heap(); 1326 permanent_reserved = sh->perm_gen()->reserved(); 1327 break; 1328 } 1329 #ifndef SERIALGC 1330 case CollectedHeap::ParallelScavengeHeap: { 1331 ParallelScavengeHeap* psh = (ParallelScavengeHeap*) Universe::heap(); 1332 permanent_reserved = psh->perm_gen()->reserved(); 1333 break; 1334 } 1335 #endif // SERIALGC 1336 } 1337 calculate_verify_data(_verify_klass_data, 1338 permanent_reserved.start(), 1339 permanent_reserved.end()); 1340 1341 return _verify_klass_data[0]; 1342 } 1343 1344 1345 1346 uintptr_t Universe::verify_klass_bits() { 1347 verify_klass_mask(); 1348 return _verify_klass_data[1]; 1349 } 1350 1351 1352 uintptr_t Universe::verify_mark_mask() { 1353 return markOopDesc::lock_mask_in_place; 1354 } 1355 1356 1357 1358 uintptr_t Universe::verify_mark_bits() { 1359 intptr_t mask = verify_mark_mask(); 1360 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1361 assert((bits & ~mask) == 0, "no stray header bits"); 1362 return bits; 1363 } 1364 #endif // PRODUCT 1365 1366 1367 void Universe::compute_verify_oop_data() { 1368 verify_oop_mask(); 1369 verify_oop_bits(); 1370 verify_mark_mask(); 1371 verify_mark_bits(); 1372 verify_klass_mask(); 1373 verify_klass_bits(); 1374 } 1375 1376 1377 void CommonMethodOopCache::init(klassOop k, methodOop m, TRAPS) { 1378 if (!UseSharedSpaces) { 1379 _klass = k; 1380 } 1381 #ifndef PRODUCT 1382 else { 1383 // sharing initilization should have already set up _klass 1384 assert(_klass != NULL, "just checking"); 1385 } 1386 #endif 1387 1388 _method_idnum = m->method_idnum(); 1389 assert(_method_idnum >= 0, "sanity check"); 1390 } 1391 1392 1393 ActiveMethodOopsCache::~ActiveMethodOopsCache() { 1394 if (_prev_methods != NULL) { 1395 for (int i = _prev_methods->length() - 1; i >= 0; i--) { 1396 jweak method_ref = _prev_methods->at(i); 1397 if (method_ref != NULL) { 1398 JNIHandles::destroy_weak_global(method_ref); 1399 } 1400 } 1401 delete _prev_methods; 1402 _prev_methods = NULL; 1403 } 1404 } 1405 1406 1407 void ActiveMethodOopsCache::add_previous_version(const methodOop method) { 1408 assert(Thread::current()->is_VM_thread(), 1409 "only VMThread can add previous versions"); 1410 1411 if (_prev_methods == NULL) { 1412 // This is the first previous version so make some space. 1413 // Start with 2 elements under the assumption that the class 1414 // won't be redefined much. 1415 _prev_methods = new (ResourceObj::C_HEAP) GrowableArray<jweak>(2, true); 1416 } 1417 1418 // RC_TRACE macro has an embedded ResourceMark 1419 RC_TRACE(0x00000100, 1420 ("add: %s(%s): adding prev version ref for cached method @%d", 1421 method->name()->as_C_string(), method->signature()->as_C_string(), 1422 _prev_methods->length())); 1423 1424 methodHandle method_h(method); 1425 jweak method_ref = JNIHandles::make_weak_global(method_h); 1426 _prev_methods->append(method_ref); 1427 1428 // Using weak references allows previous versions of the cached 1429 // method to be GC'ed when they are no longer needed. Since the 1430 // caller is the VMThread and we are at a safepoint, this is a good 1431 // time to clear out unused weak references. 1432 1433 for (int i = _prev_methods->length() - 1; i >= 0; i--) { 1434 jweak method_ref = _prev_methods->at(i); 1435 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); 1436 if (method_ref == NULL) { 1437 _prev_methods->remove_at(i); 1438 // Since we are traversing the array backwards, we don't have to 1439 // do anything special with the index. 1440 continue; // robustness 1441 } 1442 1443 methodOop m = (methodOop)JNIHandles::resolve(method_ref); 1444 if (m == NULL) { 1445 // this method entry has been GC'ed so remove it 1446 JNIHandles::destroy_weak_global(method_ref); 1447 _prev_methods->remove_at(i); 1448 } else { 1449 // RC_TRACE macro has an embedded ResourceMark 1450 RC_TRACE(0x00000400, ("add: %s(%s): previous cached method @%d is alive", 1451 m->name()->as_C_string(), m->signature()->as_C_string(), i)); 1452 } 1453 } 1454 } // end add_previous_version() 1455 1456 1457 bool ActiveMethodOopsCache::is_same_method(const methodOop method) const { 1458 instanceKlass* ik = instanceKlass::cast(klass()); 1459 methodOop check_method = ik->method_with_idnum(method_idnum()); 1460 assert(check_method != NULL, "sanity check"); 1461 if (check_method == method) { 1462 // done with the easy case 1463 return true; 1464 } 1465 1466 if (_prev_methods != NULL) { 1467 // The cached method has been redefined at least once so search 1468 // the previous versions for a match. 1469 for (int i = 0; i < _prev_methods->length(); i++) { 1470 jweak method_ref = _prev_methods->at(i); 1471 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); 1472 if (method_ref == NULL) { 1473 continue; // robustness 1474 } 1475 1476 check_method = (methodOop)JNIHandles::resolve(method_ref); 1477 if (check_method == method) { 1478 // a previous version matches 1479 return true; 1480 } 1481 } 1482 } 1483 1484 // either no previous versions or no previous version matched 1485 return false; 1486 } 1487 1488 1489 methodOop LatestMethodOopCache::get_methodOop() { 1490 instanceKlass* ik = instanceKlass::cast(klass()); 1491 methodOop m = ik->method_with_idnum(method_idnum()); 1492 assert(m != NULL, "sanity check"); 1493 return m; 1494 } 1495 1496 1497 #ifdef ASSERT 1498 // Release dummy object(s) at bottom of heap 1499 bool Universe::release_fullgc_alot_dummy() { 1500 MutexLocker ml(FullGCALot_lock); 1501 if (_fullgc_alot_dummy_array != NULL) { 1502 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1503 // No more dummies to release, release entire array instead 1504 _fullgc_alot_dummy_array = NULL; 1505 return false; 1506 } 1507 if (!UseConcMarkSweepGC) { 1508 // Release dummy at bottom of old generation 1509 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1510 } 1511 // Release dummy at bottom of permanent generation 1512 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1513 } 1514 return true; 1515 } 1516 1517 #endif // ASSERT