1 /* 2 * Copyright (c) 1997, 2014, 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/symbolTable.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "gc_implementation/shared/markSweep.inline.hpp" 30 #include "gc_interface/collectedHeap.inline.hpp" 31 #include "memory/genOopClosures.inline.hpp" 32 #include "memory/iterator.inline.hpp" 33 #include "memory/metadataFactory.hpp" 34 #include "memory/resourceArea.hpp" 35 #include "memory/universe.inline.hpp" 36 #include "oops/instanceKlass.hpp" 37 #include "oops/klass.inline.hpp" 38 #include "oops/objArrayKlass.inline.hpp" 39 #include "oops/objArrayOop.inline.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "oops/symbol.hpp" 42 #include "runtime/handles.inline.hpp" 43 #include "runtime/mutexLocker.hpp" 44 #include "runtime/orderAccess.inline.hpp" 45 #include "utilities/copy.hpp" 46 #include "utilities/macros.hpp" 47 #if INCLUDE_ALL_GCS 48 #include "gc_implementation/concurrentMarkSweep/cmsOopClosures.inline.hpp" 49 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 50 #include "gc_implementation/g1/g1OopClosures.inline.hpp" 51 #include "gc_implementation/g1/g1RemSet.inline.hpp" 52 #include "gc_implementation/g1/heapRegionManager.inline.hpp" 53 #include "gc_implementation/parNew/parOopClosures.inline.hpp" 54 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp" 55 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" 56 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" 57 #include "oops/oop.pcgc.inline.hpp" 58 #endif // INCLUDE_ALL_GCS 59 60 ObjArrayKlass* ObjArrayKlass::allocate(ClassLoaderData* loader_data, int n, KlassHandle klass_handle, Symbol* name, TRAPS) { 61 assert(ObjArrayKlass::header_size() <= InstanceKlass::header_size(), 62 "array klasses must be same size as InstanceKlass"); 63 64 int size = ArrayKlass::static_size(ObjArrayKlass::header_size()); 65 66 return new (loader_data, size, THREAD) ObjArrayKlass(n, klass_handle, name); 67 } 68 69 Klass* ObjArrayKlass::allocate_objArray_klass(ClassLoaderData* loader_data, 70 int n, KlassHandle element_klass, TRAPS) { 71 72 // Eagerly allocate the direct array supertype. 73 KlassHandle super_klass = KlassHandle(); 74 if (!Universe::is_bootstrapping() || SystemDictionary::Object_klass_loaded()) { 75 KlassHandle element_super (THREAD, element_klass->super()); 76 if (element_super.not_null()) { 77 // The element type has a direct super. E.g., String[] has direct super of Object[]. 78 super_klass = KlassHandle(THREAD, element_super->array_klass_or_null()); 79 bool supers_exist = super_klass.not_null(); 80 // Also, see if the element has secondary supertypes. 81 // We need an array type for each. 82 Array<Klass*>* element_supers = element_klass->secondary_supers(); 83 for( int i = element_supers->length()-1; i >= 0; i-- ) { 84 Klass* elem_super = element_supers->at(i); 85 if (elem_super->array_klass_or_null() == NULL) { 86 supers_exist = false; 87 break; 88 } 89 } 90 if (!supers_exist) { 91 // Oops. Not allocated yet. Back out, allocate it, and retry. 92 KlassHandle ek; 93 { 94 MutexUnlocker mu(MultiArray_lock); 95 MutexUnlocker mc(Compile_lock); // for vtables 96 Klass* sk = element_super->array_klass(CHECK_0); 97 super_klass = KlassHandle(THREAD, sk); 98 for( int i = element_supers->length()-1; i >= 0; i-- ) { 99 KlassHandle elem_super (THREAD, element_supers->at(i)); 100 elem_super->array_klass(CHECK_0); 101 } 102 // Now retry from the beginning 103 Klass* klass_oop = element_klass->array_klass(n, CHECK_0); 104 // Create a handle because the enclosing brace, when locking 105 // can cause a gc. Better to have this function return a Handle. 106 ek = KlassHandle(THREAD, klass_oop); 107 } // re-lock 108 return ek(); 109 } 110 } else { 111 // The element type is already Object. Object[] has direct super of Object. 112 super_klass = KlassHandle(THREAD, SystemDictionary::Object_klass()); 113 } 114 } 115 116 // Create type name for klass. 117 Symbol* name = NULL; 118 if (!element_klass->oop_is_instance() || 119 (name = InstanceKlass::cast(element_klass())->array_name()) == NULL) { 120 121 ResourceMark rm(THREAD); 122 char *name_str = element_klass->name()->as_C_string(); 123 int len = element_klass->name()->utf8_length(); 124 char *new_str = NEW_RESOURCE_ARRAY(char, len + 4); 125 int idx = 0; 126 new_str[idx++] = '['; 127 if (element_klass->oop_is_instance()) { // it could be an array or simple type 128 new_str[idx++] = 'L'; 129 } 130 memcpy(&new_str[idx], name_str, len * sizeof(char)); 131 idx += len; 132 if (element_klass->oop_is_instance()) { 133 new_str[idx++] = ';'; 134 } 135 new_str[idx++] = '\0'; 136 name = SymbolTable::new_permanent_symbol(new_str, CHECK_0); 137 if (element_klass->oop_is_instance()) { 138 InstanceKlass* ik = InstanceKlass::cast(element_klass()); 139 ik->set_array_name(name); 140 } 141 } 142 143 // Initialize instance variables 144 ObjArrayKlass* oak = ObjArrayKlass::allocate(loader_data, n, element_klass, name, CHECK_0); 145 146 // Add all classes to our internal class loader list here, 147 // including classes in the bootstrap (NULL) class loader. 148 // GC walks these as strong roots. 149 loader_data->add_class(oak); 150 151 // Call complete_create_array_klass after all instance variables has been initialized. 152 ArrayKlass::complete_create_array_klass(oak, super_klass, CHECK_0); 153 154 return oak; 155 } 156 157 ObjArrayKlass::ObjArrayKlass(int n, KlassHandle element_klass, Symbol* name) : ArrayKlass(name) { 158 this->set_dimension(n); 159 this->set_element_klass(element_klass()); 160 // decrement refcount because object arrays are not explicitly freed. The 161 // InstanceKlass array_name() keeps the name counted while the klass is 162 // loaded. 163 name->decrement_refcount(); 164 165 Klass* bk; 166 if (element_klass->oop_is_objArray()) { 167 bk = ObjArrayKlass::cast(element_klass())->bottom_klass(); 168 } else { 169 bk = element_klass(); 170 } 171 assert(bk != NULL && (bk->oop_is_instance() || bk->oop_is_typeArray()), "invalid bottom klass"); 172 this->set_bottom_klass(bk); 173 this->set_class_loader_data(bk->class_loader_data()); 174 175 this->set_layout_helper(array_layout_helper(T_OBJECT)); 176 assert(this->oop_is_array(), "sanity"); 177 assert(this->oop_is_objArray(), "sanity"); 178 } 179 180 int ObjArrayKlass::oop_size(oop obj) const { 181 assert(obj->is_objArray(), "must be object array"); 182 return objArrayOop(obj)->object_size(); 183 } 184 185 objArrayOop ObjArrayKlass::allocate(int length, TRAPS) { 186 if (length >= 0) { 187 if (length <= arrayOopDesc::max_array_length(T_OBJECT)) { 188 int size = objArrayOopDesc::object_size(length); 189 KlassHandle h_k(THREAD, this); 190 return (objArrayOop)CollectedHeap::array_allocate(h_k, size, length, THREAD); 191 } else { 192 report_java_out_of_memory("Requested array size exceeds VM limit"); 193 JvmtiExport::post_array_size_exhausted(); 194 THROW_OOP_0(Universe::out_of_memory_error_array_size()); 195 } 196 } else { 197 THROW_0(vmSymbols::java_lang_NegativeArraySizeException()); 198 } 199 } 200 201 static int multi_alloc_counter = 0; 202 203 oop ObjArrayKlass::multi_allocate(int rank, jint* sizes, TRAPS) { 204 int length = *sizes; 205 // Call to lower_dimension uses this pointer, so most be called before a 206 // possible GC 207 KlassHandle h_lower_dimension(THREAD, lower_dimension()); 208 // If length < 0 allocate will throw an exception. 209 objArrayOop array = allocate(length, CHECK_NULL); 210 objArrayHandle h_array (THREAD, array); 211 if (rank > 1) { 212 if (length != 0) { 213 for (int index = 0; index < length; index++) { 214 ArrayKlass* ak = ArrayKlass::cast(h_lower_dimension()); 215 oop sub_array = ak->multi_allocate(rank-1, &sizes[1], CHECK_NULL); 216 h_array->obj_at_put(index, sub_array); 217 } 218 } else { 219 // Since this array dimension has zero length, nothing will be 220 // allocated, however the lower dimension values must be checked 221 // for illegal values. 222 for (int i = 0; i < rank - 1; ++i) { 223 sizes += 1; 224 if (*sizes < 0) { 225 THROW_0(vmSymbols::java_lang_NegativeArraySizeException()); 226 } 227 } 228 } 229 } 230 return h_array(); 231 } 232 233 // Either oop or narrowOop depending on UseCompressedOops. 234 template <class T> void ObjArrayKlass::do_copy(arrayOop s, T* src, 235 arrayOop d, T* dst, int length, TRAPS) { 236 237 BarrierSet* bs = Universe::heap()->barrier_set(); 238 // For performance reasons, we assume we are that the write barrier we 239 // are using has optimized modes for arrays of references. At least one 240 // of the asserts below will fail if this is not the case. 241 assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt"); 242 assert(bs->has_write_ref_array_pre_opt(), "For pre-barrier as well."); 243 244 if (s == d) { 245 // since source and destination are equal we do not need conversion checks. 246 assert(length > 0, "sanity check"); 247 bs->write_ref_array_pre(dst, length); 248 Copy::conjoint_oops_atomic(src, dst, length); 249 } else { 250 // We have to make sure all elements conform to the destination array 251 Klass* bound = ObjArrayKlass::cast(d->klass())->element_klass(); 252 Klass* stype = ObjArrayKlass::cast(s->klass())->element_klass(); 253 if (stype == bound || stype->is_subtype_of(bound)) { 254 // elements are guaranteed to be subtypes, so no check necessary 255 bs->write_ref_array_pre(dst, length); 256 Copy::conjoint_oops_atomic(src, dst, length); 257 } else { 258 // slow case: need individual subtype checks 259 // note: don't use obj_at_put below because it includes a redundant store check 260 T* from = src; 261 T* end = from + length; 262 for (T* p = dst; from < end; from++, p++) { 263 // XXX this is going to be slow. 264 T element = *from; 265 // even slower now 266 bool element_is_null = oopDesc::is_null(element); 267 oop new_val = element_is_null ? oop(NULL) 268 : oopDesc::decode_heap_oop_not_null(element); 269 if (element_is_null || 270 (new_val->klass())->is_subtype_of(bound)) { 271 bs->write_ref_field_pre(p, new_val); 272 *p = element; 273 } else { 274 // We must do a barrier to cover the partial copy. 275 const size_t pd = pointer_delta(p, dst, (size_t)heapOopSize); 276 // pointer delta is scaled to number of elements (length field in 277 // objArrayOop) which we assume is 32 bit. 278 assert(pd == (size_t)(int)pd, "length field overflow"); 279 bs->write_ref_array((HeapWord*)dst, pd); 280 THROW(vmSymbols::java_lang_ArrayStoreException()); 281 return; 282 } 283 } 284 } 285 } 286 bs->write_ref_array((HeapWord*)dst, length); 287 } 288 289 void ObjArrayKlass::copy_array(arrayOop s, int src_pos, arrayOop d, 290 int dst_pos, int length, TRAPS) { 291 assert(s->is_objArray(), "must be obj array"); 292 293 if (!d->is_objArray()) { 294 THROW(vmSymbols::java_lang_ArrayStoreException()); 295 } 296 297 // Check is all offsets and lengths are non negative 298 if (src_pos < 0 || dst_pos < 0 || length < 0) { 299 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); 300 } 301 // Check if the ranges are valid 302 if ( (((unsigned int) length + (unsigned int) src_pos) > (unsigned int) s->length()) 303 || (((unsigned int) length + (unsigned int) dst_pos) > (unsigned int) d->length()) ) { 304 THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException()); 305 } 306 307 // Special case. Boundary cases must be checked first 308 // This allows the following call: copy_array(s, s.length(), d.length(), 0). 309 // This is correct, since the position is supposed to be an 'in between point', i.e., s.length(), 310 // points to the right of the last element. 311 if (length==0) { 312 return; 313 } 314 if (UseCompressedOops) { 315 narrowOop* const src = objArrayOop(s)->obj_at_addr<narrowOop>(src_pos); 316 narrowOop* const dst = objArrayOop(d)->obj_at_addr<narrowOop>(dst_pos); 317 do_copy<narrowOop>(s, src, d, dst, length, CHECK); 318 } else { 319 oop* const src = objArrayOop(s)->obj_at_addr<oop>(src_pos); 320 oop* const dst = objArrayOop(d)->obj_at_addr<oop>(dst_pos); 321 do_copy<oop> (s, src, d, dst, length, CHECK); 322 } 323 } 324 325 326 Klass* ObjArrayKlass::array_klass_impl(bool or_null, int n, TRAPS) { 327 328 assert(dimension() <= n, "check order of chain"); 329 int dim = dimension(); 330 if (dim == n) return this; 331 332 if (higher_dimension() == NULL) { 333 if (or_null) return NULL; 334 335 ResourceMark rm; 336 JavaThread *jt = (JavaThread *)THREAD; 337 { 338 MutexLocker mc(Compile_lock, THREAD); // for vtables 339 // Ensure atomic creation of higher dimensions 340 MutexLocker mu(MultiArray_lock, THREAD); 341 342 // Check if another thread beat us 343 if (higher_dimension() == NULL) { 344 345 // Create multi-dim klass object and link them together 346 Klass* k = 347 ObjArrayKlass::allocate_objArray_klass(class_loader_data(), dim + 1, this, CHECK_NULL); 348 ObjArrayKlass* ak = ObjArrayKlass::cast(k); 349 ak->set_lower_dimension(this); 350 OrderAccess::storestore(); 351 set_higher_dimension(ak); 352 assert(ak->oop_is_objArray(), "incorrect initialization of ObjArrayKlass"); 353 } 354 } 355 } else { 356 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 357 } 358 359 ObjArrayKlass *ak = ObjArrayKlass::cast(higher_dimension()); 360 if (or_null) { 361 return ak->array_klass_or_null(n); 362 } 363 return ak->array_klass(n, THREAD); 364 } 365 366 Klass* ObjArrayKlass::array_klass_impl(bool or_null, TRAPS) { 367 return array_klass_impl(or_null, dimension() + 1, THREAD); 368 } 369 370 bool ObjArrayKlass::can_be_primary_super_slow() const { 371 if (!bottom_klass()->can_be_primary_super()) 372 // array of interfaces 373 return false; 374 else 375 return Klass::can_be_primary_super_slow(); 376 } 377 378 GrowableArray<Klass*>* ObjArrayKlass::compute_secondary_supers(int num_extra_slots) { 379 // interfaces = { cloneable_klass, serializable_klass, elemSuper[], ... }; 380 Array<Klass*>* elem_supers = element_klass()->secondary_supers(); 381 int num_elem_supers = elem_supers == NULL ? 0 : elem_supers->length(); 382 int num_secondaries = num_extra_slots + 2 + num_elem_supers; 383 if (num_secondaries == 2) { 384 // Must share this for correct bootstrapping! 385 set_secondary_supers(Universe::the_array_interfaces_array()); 386 return NULL; 387 } else { 388 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(num_elem_supers+2); 389 secondaries->push(SystemDictionary::Cloneable_klass()); 390 secondaries->push(SystemDictionary::Serializable_klass()); 391 for (int i = 0; i < num_elem_supers; i++) { 392 Klass* elem_super = (Klass*) elem_supers->at(i); 393 Klass* array_super = elem_super->array_klass_or_null(); 394 assert(array_super != NULL, "must already have been created"); 395 secondaries->push(array_super); 396 } 397 return secondaries; 398 } 399 } 400 401 bool ObjArrayKlass::compute_is_subtype_of(Klass* k) { 402 if (!k->oop_is_objArray()) 403 return ArrayKlass::compute_is_subtype_of(k); 404 405 ObjArrayKlass* oak = ObjArrayKlass::cast(k); 406 return element_klass()->is_subtype_of(oak->element_klass()); 407 } 408 409 void ObjArrayKlass::initialize(TRAPS) { 410 bottom_klass()->initialize(THREAD); // dispatches to either InstanceKlass or TypeArrayKlass 411 } 412 413 #define ObjArrayKlass_SPECIALIZED_OOP_ITERATE(T, a, p, do_oop) \ 414 { \ 415 T* p = (T*)(a)->base(); \ 416 T* const end = p + (a)->length(); \ 417 while (p < end) { \ 418 do_oop; \ 419 p++; \ 420 } \ 421 } 422 423 #define ObjArrayKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(T, a, p, low, high, do_oop) \ 424 { \ 425 T* const l = (T*)(low); \ 426 T* const h = (T*)(high); \ 427 T* p = (T*)(a)->base(); \ 428 T* end = p + (a)->length(); \ 429 if (p < l) p = l; \ 430 if (end > h) end = h; \ 431 while (p < end) { \ 432 do_oop; \ 433 ++p; \ 434 } \ 435 } 436 437 #define ObjArrayKlass_OOP_ITERATE(a, p, do_oop) \ 438 if (UseCompressedOops) { \ 439 ObjArrayKlass_SPECIALIZED_OOP_ITERATE(narrowOop, \ 440 a, p, do_oop) \ 441 } else { \ 442 ObjArrayKlass_SPECIALIZED_OOP_ITERATE(oop, \ 443 a, p, do_oop) \ 444 } 445 446 #define ObjArrayKlass_BOUNDED_OOP_ITERATE(a, p, low, high, do_oop) \ 447 if (UseCompressedOops) { \ 448 ObjArrayKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop, \ 449 a, p, low, high, do_oop) \ 450 } else { \ 451 ObjArrayKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop, \ 452 a, p, low, high, do_oop) \ 453 } 454 455 void ObjArrayKlass::oop_follow_contents(oop obj) { 456 assert (obj->is_array(), "obj must be array"); 457 MarkSweep::follow_klass(obj->klass()); 458 if (UseCompressedOops) { 459 objarray_follow_contents<narrowOop>(obj, 0); 460 } else { 461 objarray_follow_contents<oop>(obj, 0); 462 } 463 } 464 465 #if INCLUDE_ALL_GCS 466 void ObjArrayKlass::oop_follow_contents(ParCompactionManager* cm, 467 oop obj) { 468 assert(obj->is_array(), "obj must be array"); 469 PSParallelCompact::follow_klass(cm, obj->klass()); 470 if (UseCompressedOops) { 471 objarray_follow_contents<narrowOop>(cm, obj, 0); 472 } else { 473 objarray_follow_contents<oop>(cm, obj, 0); 474 } 475 } 476 #endif // INCLUDE_ALL_GCS 477 478 #define ObjArrayKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ 479 \ 480 int ObjArrayKlass::oop_oop_iterate##nv_suffix(oop obj, \ 481 OopClosureType* closure) { \ 482 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::oa); \ 483 assert (obj->is_array(), "obj must be array"); \ 484 objArrayOop a = objArrayOop(obj); \ 485 /* Get size before changing pointers. */ \ 486 /* Don't call size() or oop_size() since that is a virtual call. */ \ 487 int size = a->object_size(); \ 488 if_do_metadata_checked(closure, nv_suffix) { \ 489 closure->do_klass##nv_suffix(obj->klass()); \ 490 } \ 491 ObjArrayKlass_OOP_ITERATE(a, p, (closure)->do_oop##nv_suffix(p)) \ 492 return size; \ 493 } 494 495 #define ObjArrayKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \ 496 \ 497 int ObjArrayKlass::oop_oop_iterate##nv_suffix##_m(oop obj, \ 498 OopClosureType* closure, \ 499 MemRegion mr) { \ 500 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::oa); \ 501 assert(obj->is_array(), "obj must be array"); \ 502 objArrayOop a = objArrayOop(obj); \ 503 /* Get size before changing pointers. */ \ 504 /* Don't call size() or oop_size() since that is a virtual call */ \ 505 int size = a->object_size(); \ 506 if_do_metadata_checked(closure, nv_suffix) { \ 507 /* SSS: Do we need to pass down mr here? */ \ 508 closure->do_klass##nv_suffix(a->klass()); \ 509 } \ 510 ObjArrayKlass_BOUNDED_OOP_ITERATE( \ 511 a, p, mr.start(), mr.end(), (closure)->do_oop##nv_suffix(p)) \ 512 return size; \ 513 } 514 515 // Like oop_oop_iterate but only iterates over a specified range and only used 516 // for objArrayOops. 517 #define ObjArrayKlass_OOP_OOP_ITERATE_DEFN_r(OopClosureType, nv_suffix) \ 518 \ 519 int ObjArrayKlass::oop_oop_iterate_range##nv_suffix(oop obj, \ 520 OopClosureType* closure, \ 521 int start, int end) { \ 522 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::oa); \ 523 assert(obj->is_array(), "obj must be array"); \ 524 objArrayOop a = objArrayOop(obj); \ 525 /* Get size before changing pointers. */ \ 526 /* Don't call size() or oop_size() since that is a virtual call */ \ 527 int size = a->object_size(); \ 528 if (UseCompressedOops) { \ 529 HeapWord* low = start == 0 ? (HeapWord*)a : (HeapWord*)a->obj_at_addr<narrowOop>(start);\ 530 /* this might be wierd if end needs to be aligned on HeapWord boundary */ \ 531 HeapWord* high = (HeapWord*)((narrowOop*)a->base() + end); \ 532 MemRegion mr(low, high); \ 533 if_do_metadata_checked(closure, nv_suffix) { \ 534 /* SSS: Do we need to pass down mr here? */ \ 535 closure->do_klass##nv_suffix(a->klass()); \ 536 } \ 537 ObjArrayKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop, \ 538 a, p, low, high, (closure)->do_oop##nv_suffix(p)) \ 539 } else { \ 540 HeapWord* low = start == 0 ? (HeapWord*)a : (HeapWord*)a->obj_at_addr<oop>(start); \ 541 HeapWord* high = (HeapWord*)((oop*)a->base() + end); \ 542 MemRegion mr(low, high); \ 543 if_do_metadata_checked(closure, nv_suffix) { \ 544 /* SSS: Do we need to pass down mr here? */ \ 545 closure->do_klass##nv_suffix(a->klass()); \ 546 } \ 547 ObjArrayKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop, \ 548 a, p, low, high, (closure)->do_oop##nv_suffix(p)) \ 549 } \ 550 return size; \ 551 } 552 553 ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_DEFN) 554 ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_DEFN) 555 ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_DEFN_m) 556 ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_DEFN_m) 557 ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayKlass_OOP_OOP_ITERATE_DEFN_r) 558 ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayKlass_OOP_OOP_ITERATE_DEFN_r) 559 560 int ObjArrayKlass::oop_adjust_pointers(oop obj) { 561 assert(obj->is_objArray(), "obj must be obj array"); 562 objArrayOop a = objArrayOop(obj); 563 // Get size before changing pointers. 564 // Don't call size() or oop_size() since that is a virtual call. 565 int size = a->object_size(); 566 ObjArrayKlass_OOP_ITERATE(a, p, MarkSweep::adjust_pointer(p)) 567 return size; 568 } 569 570 #if INCLUDE_ALL_GCS 571 void ObjArrayKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { 572 assert(obj->is_objArray(), "obj must be obj array"); 573 ObjArrayKlass_OOP_ITERATE( \ 574 objArrayOop(obj), p, \ 575 if (PSScavenge::should_scavenge(p)) { \ 576 pm->claim_or_forward_depth(p); \ 577 }) 578 } 579 580 int ObjArrayKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { 581 assert (obj->is_objArray(), "obj must be obj array"); 582 objArrayOop a = objArrayOop(obj); 583 int size = a->object_size(); 584 ObjArrayKlass_OOP_ITERATE(a, p, PSParallelCompact::adjust_pointer(p)) 585 return size; 586 } 587 #endif // INCLUDE_ALL_GCS 588 589 // JVM support 590 591 jint ObjArrayKlass::compute_modifier_flags(TRAPS) const { 592 // The modifier for an objectArray is the same as its element 593 if (element_klass() == NULL) { 594 assert(Universe::is_bootstrapping(), "partial objArray only at startup"); 595 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC; 596 } 597 // Return the flags of the bottom element type. 598 jint element_flags = bottom_klass()->compute_modifier_flags(CHECK_0); 599 600 return (element_flags & (JVM_ACC_PUBLIC | JVM_ACC_PRIVATE | JVM_ACC_PROTECTED)) 601 | (JVM_ACC_ABSTRACT | JVM_ACC_FINAL); 602 } 603 604 605 // Printing 606 607 void ObjArrayKlass::print_on(outputStream* st) const { 608 #ifndef PRODUCT 609 Klass::print_on(st); 610 st->print(" - instance klass: "); 611 element_klass()->print_value_on(st); 612 st->cr(); 613 #endif //PRODUCT 614 } 615 616 void ObjArrayKlass::print_value_on(outputStream* st) const { 617 assert(is_klass(), "must be klass"); 618 619 element_klass()->print_value_on(st); 620 st->print("[]"); 621 } 622 623 #ifndef PRODUCT 624 625 void ObjArrayKlass::oop_print_on(oop obj, outputStream* st) { 626 ArrayKlass::oop_print_on(obj, st); 627 assert(obj->is_objArray(), "must be objArray"); 628 objArrayOop oa = objArrayOop(obj); 629 int print_len = MIN2((intx) oa->length(), MaxElementPrintSize); 630 for(int index = 0; index < print_len; index++) { 631 st->print(" - %3d : ", index); 632 oa->obj_at(index)->print_value_on(st); 633 st->cr(); 634 } 635 int remaining = oa->length() - print_len; 636 if (remaining > 0) { 637 st->print_cr(" - <%d more elements, increase MaxElementPrintSize to print>", remaining); 638 } 639 } 640 641 #endif //PRODUCT 642 643 static int max_objArray_print_length = 4; 644 645 void ObjArrayKlass::oop_print_value_on(oop obj, outputStream* st) { 646 assert(obj->is_objArray(), "must be objArray"); 647 st->print("a "); 648 element_klass()->print_value_on(st); 649 int len = objArrayOop(obj)->length(); 650 st->print("[%d] ", len); 651 obj->print_address_on(st); 652 if (NOT_PRODUCT(PrintOopAddress ||) PrintMiscellaneous && (WizardMode || Verbose)) { 653 st->print("{"); 654 for (int i = 0; i < len; i++) { 655 if (i > max_objArray_print_length) { 656 st->print("..."); break; 657 } 658 st->print(" "INTPTR_FORMAT, (intptr_t)(void*)objArrayOop(obj)->obj_at(i)); 659 } 660 st->print(" }"); 661 } 662 } 663 664 const char* ObjArrayKlass::internal_name() const { 665 return external_name(); 666 } 667 668 669 // Verification 670 671 void ObjArrayKlass::verify_on(outputStream* st) { 672 ArrayKlass::verify_on(st); 673 guarantee(element_klass()->is_klass(), "should be klass"); 674 guarantee(bottom_klass()->is_klass(), "should be klass"); 675 Klass* bk = bottom_klass(); 676 guarantee(bk->oop_is_instance() || bk->oop_is_typeArray(), "invalid bottom klass"); 677 } 678 679 void ObjArrayKlass::oop_verify_on(oop obj, outputStream* st) { 680 ArrayKlass::oop_verify_on(obj, st); 681 guarantee(obj->is_objArray(), "must be objArray"); 682 objArrayOop oa = objArrayOop(obj); 683 for(int index = 0; index < oa->length(); index++) { 684 guarantee(oa->obj_at(index)->is_oop_or_null(), "should be oop"); 685 } 686 }