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/javaClasses.hpp" 27 #include "classfile/dictionary.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "gc_implementation/shared/markSweep.inline.hpp" 31 #include "gc_interface/collectedHeap.inline.hpp" 32 #include "memory/heapInspection.hpp" 33 #include "memory/metadataFactory.hpp" 34 #include "memory/oopFactory.hpp" 35 #include "memory/resourceArea.hpp" 36 #include "oops/instanceKlass.hpp" 37 #include "oops/klass.inline.hpp" 38 #include "oops/oop.inline2.hpp" 39 #include "runtime/atomic.hpp" 40 #include "trace/traceMacros.hpp" 41 #include "utilities/stack.hpp" 42 #include "utilities/macros.hpp" 43 #if INCLUDE_ALL_GCS 44 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp" 45 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp" 46 #include "gc_implementation/parallelScavenge/psScavenge.hpp" 47 #endif // INCLUDE_ALL_GCS 48 49 void Klass::set_name(Symbol* n) { 50 _name = n; 51 if (_name != NULL) _name->increment_refcount(); 52 } 53 54 bool Klass::is_subclass_of(const Klass* k) const { 55 // Run up the super chain and check 56 if (this == k) return true; 57 58 Klass* t = const_cast<Klass*>(this)->super(); 59 60 while (t != NULL) { 61 if (t == k) return true; 62 t = t->super(); 63 } 64 return false; 65 } 66 67 bool Klass::search_secondary_supers(Klass* k) const { 68 // Put some extra logic here out-of-line, before the search proper. 69 // This cuts down the size of the inline method. 70 71 // This is necessary, since I am never in my own secondary_super list. 72 if (this == k) 73 return true; 74 // Scan the array-of-objects for a match 75 int cnt = secondary_supers()->length(); 76 for (int i = 0; i < cnt; i++) { 77 if (secondary_supers()->at(i) == k) { 78 ((Klass*)this)->set_secondary_super_cache(k); 79 return true; 80 } 81 } 82 return false; 83 } 84 85 // Return self, except for abstract classes with exactly 1 86 // implementor. Then return the 1 concrete implementation. 87 Klass *Klass::up_cast_abstract() { 88 Klass *r = this; 89 while( r->is_abstract() ) { // Receiver is abstract? 90 Klass *s = r->subklass(); // Check for exactly 1 subklass 91 if( !s || s->next_sibling() ) // Oops; wrong count; give up 92 return this; // Return 'this' as a no-progress flag 93 r = s; // Loop till find concrete class 94 } 95 return r; // Return the 1 concrete class 96 } 97 98 // Find LCA in class hierarchy 99 Klass *Klass::LCA( Klass *k2 ) { 100 Klass *k1 = this; 101 while( 1 ) { 102 if( k1->is_subtype_of(k2) ) return k2; 103 if( k2->is_subtype_of(k1) ) return k1; 104 k1 = k1->super(); 105 k2 = k2->super(); 106 } 107 } 108 109 110 void Klass::check_valid_for_instantiation(bool throwError, TRAPS) { 111 ResourceMark rm(THREAD); 112 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError() 113 : vmSymbols::java_lang_InstantiationException(), external_name()); 114 } 115 116 117 void Klass::copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS) { 118 THROW(vmSymbols::java_lang_ArrayStoreException()); 119 } 120 121 122 void Klass::initialize(TRAPS) { 123 ShouldNotReachHere(); 124 } 125 126 bool Klass::compute_is_subtype_of(Klass* k) { 127 assert(k->is_klass(), "argument must be a class"); 128 return is_subclass_of(k); 129 } 130 131 132 Method* Klass::uncached_lookup_method(Symbol* name, Symbol* signature, MethodLookupMode mode) const { 133 #ifdef ASSERT 134 tty->print_cr("Error: uncached_lookup_method called on a klass oop." 135 " Likely error: reflection method does not correctly" 136 " wrap return value in a mirror object."); 137 #endif 138 ShouldNotReachHere(); 139 return NULL; 140 } 141 142 void* Klass::operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS) throw() { 143 return Metaspace::allocate(loader_data, word_size, /*read_only*/false, 144 MetaspaceObj::ClassType, CHECK_NULL); 145 } 146 147 Klass::Klass() { 148 Klass* k = this; 149 150 // Preinitialize supertype information. 151 // A later call to initialize_supers() may update these settings: 152 set_super(NULL); 153 for (juint i = 0; i < Klass::primary_super_limit(); i++) { 154 _primary_supers[i] = NULL; 155 } 156 set_secondary_supers(NULL); 157 set_secondary_super_cache(NULL); 158 _primary_supers[0] = k; 159 set_super_check_offset(in_bytes(primary_supers_offset())); 160 161 set_java_mirror(NULL); 162 set_modifier_flags(0); 163 set_layout_helper(Klass::_lh_neutral_value); 164 set_name(NULL); 165 AccessFlags af; 166 af.set_flags(0); 167 set_access_flags(af); 168 set_subklass(NULL); 169 set_next_sibling(NULL); 170 set_next_link(NULL); 171 TRACE_INIT_ID(this); 172 173 set_prototype_header(markOopDesc::prototype()); 174 set_biased_lock_revocation_count(0); 175 set_last_biased_lock_bulk_revocation_time(0); 176 177 // The klass doesn't have any references at this point. 178 clear_modified_oops(); 179 clear_accumulated_modified_oops(); 180 } 181 182 jint Klass::array_layout_helper(BasicType etype) { 183 assert(etype >= T_BOOLEAN && etype <= T_OBJECT, "valid etype"); 184 // Note that T_ARRAY is not allowed here. 185 int hsize = arrayOopDesc::base_offset_in_bytes(etype); 186 int esize = type2aelembytes(etype); 187 bool isobj = (etype == T_OBJECT); 188 int tag = isobj ? _lh_array_tag_obj_value : _lh_array_tag_type_value; 189 int lh = array_layout_helper(tag, hsize, etype, exact_log2(esize)); 190 191 assert(lh < (int)_lh_neutral_value, "must look like an array layout"); 192 assert(layout_helper_is_array(lh), "correct kind"); 193 assert(layout_helper_is_objArray(lh) == isobj, "correct kind"); 194 assert(layout_helper_is_typeArray(lh) == !isobj, "correct kind"); 195 assert(layout_helper_header_size(lh) == hsize, "correct decode"); 196 assert(layout_helper_element_type(lh) == etype, "correct decode"); 197 assert(1 << layout_helper_log2_element_size(lh) == esize, "correct decode"); 198 199 return lh; 200 } 201 202 bool Klass::can_be_primary_super_slow() const { 203 if (super() == NULL) 204 return true; 205 else if (super()->super_depth() >= primary_super_limit()-1) 206 return false; 207 else 208 return true; 209 } 210 211 void Klass::initialize_supers(Klass* k, TRAPS) { 212 if (FastSuperclassLimit == 0) { 213 // None of the other machinery matters. 214 set_super(k); 215 return; 216 } 217 if (k == NULL) { 218 set_super(NULL); 219 _primary_supers[0] = this; 220 assert(super_depth() == 0, "Object must already be initialized properly"); 221 } else if (k != super() || k == SystemDictionary::Object_klass()) { 222 assert(super() == NULL || super() == SystemDictionary::Object_klass(), 223 "initialize this only once to a non-trivial value"); 224 set_super(k); 225 Klass* sup = k; 226 int sup_depth = sup->super_depth(); 227 juint my_depth = MIN2(sup_depth + 1, (int)primary_super_limit()); 228 if (!can_be_primary_super_slow()) 229 my_depth = primary_super_limit(); 230 for (juint i = 0; i < my_depth; i++) { 231 _primary_supers[i] = sup->_primary_supers[i]; 232 } 233 Klass* *super_check_cell; 234 if (my_depth < primary_super_limit()) { 235 _primary_supers[my_depth] = this; 236 super_check_cell = &_primary_supers[my_depth]; 237 } else { 238 // Overflow of the primary_supers array forces me to be secondary. 239 super_check_cell = &_secondary_super_cache; 240 } 241 set_super_check_offset((address)super_check_cell - (address) this); 242 243 #ifdef ASSERT 244 { 245 juint j = super_depth(); 246 assert(j == my_depth, "computed accessor gets right answer"); 247 Klass* t = this; 248 while (!t->can_be_primary_super()) { 249 t = t->super(); 250 j = t->super_depth(); 251 } 252 for (juint j1 = j+1; j1 < primary_super_limit(); j1++) { 253 assert(primary_super_of_depth(j1) == NULL, "super list padding"); 254 } 255 while (t != NULL) { 256 assert(primary_super_of_depth(j) == t, "super list initialization"); 257 t = t->super(); 258 --j; 259 } 260 assert(j == (juint)-1, "correct depth count"); 261 } 262 #endif 263 } 264 265 if (secondary_supers() == NULL) { 266 KlassHandle this_kh (THREAD, this); 267 268 // Now compute the list of secondary supertypes. 269 // Secondaries can occasionally be on the super chain, 270 // if the inline "_primary_supers" array overflows. 271 int extras = 0; 272 Klass* p; 273 for (p = super(); !(p == NULL || p->can_be_primary_super()); p = p->super()) { 274 ++extras; 275 } 276 277 ResourceMark rm(THREAD); // need to reclaim GrowableArrays allocated below 278 279 // Compute the "real" non-extra secondaries. 280 GrowableArray<Klass*>* secondaries = compute_secondary_supers(extras); 281 if (secondaries == NULL) { 282 // secondary_supers set by compute_secondary_supers 283 return; 284 } 285 286 GrowableArray<Klass*>* primaries = new GrowableArray<Klass*>(extras); 287 288 for (p = this_kh->super(); !(p == NULL || p->can_be_primary_super()); p = p->super()) { 289 int i; // Scan for overflow primaries being duplicates of 2nd'arys 290 291 // This happens frequently for very deeply nested arrays: the 292 // primary superclass chain overflows into the secondary. The 293 // secondary list contains the element_klass's secondaries with 294 // an extra array dimension added. If the element_klass's 295 // secondary list already contains some primary overflows, they 296 // (with the extra level of array-ness) will collide with the 297 // normal primary superclass overflows. 298 for( i = 0; i < secondaries->length(); i++ ) { 299 if( secondaries->at(i) == p ) 300 break; 301 } 302 if( i < secondaries->length() ) 303 continue; // It's a dup, don't put it in 304 primaries->push(p); 305 } 306 // Combine the two arrays into a metadata object to pack the array. 307 // The primaries are added in the reverse order, then the secondaries. 308 int new_length = primaries->length() + secondaries->length(); 309 Array<Klass*>* s2 = MetadataFactory::new_array<Klass*>( 310 class_loader_data(), new_length, CHECK); 311 int fill_p = primaries->length(); 312 for (int j = 0; j < fill_p; j++) { 313 s2->at_put(j, primaries->pop()); // add primaries in reverse order. 314 } 315 for( int j = 0; j < secondaries->length(); j++ ) { 316 s2->at_put(j+fill_p, secondaries->at(j)); // add secondaries on the end. 317 } 318 319 #ifdef ASSERT 320 // We must not copy any NULL placeholders left over from bootstrap. 321 for (int j = 0; j < s2->length(); j++) { 322 assert(s2->at(j) != NULL, "correct bootstrapping order"); 323 } 324 #endif 325 326 this_kh->set_secondary_supers(s2); 327 } 328 } 329 330 GrowableArray<Klass*>* Klass::compute_secondary_supers(int num_extra_slots) { 331 assert(num_extra_slots == 0, "override for complex klasses"); 332 set_secondary_supers(Universe::the_empty_klass_array()); 333 return NULL; 334 } 335 336 337 InstanceKlass* Klass::superklass() const { 338 assert(super() == NULL || super()->oop_is_instance(), "must be instance klass"); 339 return _super == NULL ? NULL : InstanceKlass::cast(_super); 340 } 341 342 void Klass::set_subklass(Klass* s) { 343 assert(s != this, "sanity check"); 344 _subklass = s; 345 } 346 347 void Klass::set_next_sibling(Klass* s) { 348 assert(s != this, "sanity check"); 349 _next_sibling = s; 350 } 351 352 void Klass::append_to_sibling_list() { 353 debug_only(verify();) 354 // add ourselves to superklass' subklass list 355 InstanceKlass* super = superklass(); 356 if (super == NULL) return; // special case: class Object 357 assert((!super->is_interface() // interfaces cannot be supers 358 && (super->superklass() == NULL || !is_interface())), 359 "an interface can only be a subklass of Object"); 360 Klass* prev_first_subklass = super->subklass(); 361 if (prev_first_subklass != NULL) { 362 // set our sibling to be the superklass' previous first subklass 363 set_next_sibling(prev_first_subklass); 364 } 365 // make ourselves the superklass' first subklass 366 super->set_subklass(this); 367 debug_only(verify();) 368 } 369 370 bool Klass::is_loader_alive(BoolObjectClosure* is_alive) { 371 #ifdef ASSERT 372 // The class is alive iff the class loader is alive. 373 oop loader = class_loader(); 374 bool loader_alive = (loader == NULL) || is_alive->do_object_b(loader); 375 #endif // ASSERT 376 377 // The class is alive if it's mirror is alive (which should be marked if the 378 // loader is alive) unless it's an anoymous class. 379 bool mirror_alive = is_alive->do_object_b(java_mirror()); 380 assert(!mirror_alive || loader_alive, "loader must be alive if the mirror is" 381 " but not the other way around with anonymous classes"); 382 return mirror_alive; 383 } 384 385 void Klass::clean_weak_klass_links(BoolObjectClosure* is_alive) { 386 if (!ClassUnloading) { 387 return; 388 } 389 390 Klass* root = SystemDictionary::Object_klass(); 391 Stack<Klass*, mtGC> stack; 392 393 stack.push(root); 394 while (!stack.is_empty()) { 395 Klass* current = stack.pop(); 396 397 assert(current->is_loader_alive(is_alive), "just checking, this should be live"); 398 399 // Find and set the first alive subklass 400 Klass* sub = current->subklass(); 401 while (sub != NULL && !sub->is_loader_alive(is_alive)) { 402 #ifndef PRODUCT 403 if (TraceClassUnloading && WizardMode) { 404 ResourceMark rm; 405 tty->print_cr("[Unlinking class (subclass) %s]", sub->external_name()); 406 } 407 #endif 408 sub = sub->next_sibling(); 409 } 410 current->set_subklass(sub); 411 if (sub != NULL) { 412 stack.push(sub); 413 } 414 415 // Find and set the first alive sibling 416 Klass* sibling = current->next_sibling(); 417 while (sibling != NULL && !sibling->is_loader_alive(is_alive)) { 418 if (TraceClassUnloading && WizardMode) { 419 ResourceMark rm; 420 tty->print_cr("[Unlinking class (sibling) %s]", sibling->external_name()); 421 } 422 sibling = sibling->next_sibling(); 423 } 424 current->set_next_sibling(sibling); 425 if (sibling != NULL) { 426 stack.push(sibling); 427 } 428 429 // Clean the implementors list and method data. 430 if (current->oop_is_instance()) { 431 InstanceKlass* ik = InstanceKlass::cast(current); 432 ik->clean_implementors_list(is_alive); 433 ik->clean_method_data(is_alive); 434 } 435 } 436 } 437 438 void Klass::klass_update_barrier_set(oop v) { 439 record_modified_oops(); 440 } 441 442 void Klass::klass_update_barrier_set_pre(void* p, oop v) { 443 // This barrier used by G1, where it's used remember the old oop values, 444 // so that we don't forget any objects that were live at the snapshot at 445 // the beginning. This function is only used when we write oops into 446 // Klasses. Since the Klasses are used as roots in G1, we don't have to 447 // do anything here. 448 } 449 450 void Klass::klass_oop_store(oop* p, oop v) { 451 assert(!Universe::heap()->is_in_reserved((void*)p), "Should store pointer into metadata"); 452 assert(v == NULL || Universe::heap()->is_in_reserved((void*)v), "Should store pointer to an object"); 453 454 // do the store 455 if (always_do_update_barrier) { 456 klass_oop_store((volatile oop*)p, v); 457 } else { 458 klass_update_barrier_set_pre((void*)p, v); 459 *p = v; 460 klass_update_barrier_set(v); 461 } 462 } 463 464 void Klass::klass_oop_store(volatile oop* p, oop v) { 465 assert(!Universe::heap()->is_in_reserved((void*)p), "Should store pointer into metadata"); 466 assert(v == NULL || Universe::heap()->is_in_reserved((void*)v), "Should store pointer to an object"); 467 468 klass_update_barrier_set_pre((void*)p, v); 469 OrderAccess::release_store_ptr(p, v); 470 klass_update_barrier_set(v); 471 } 472 473 void Klass::oops_do(OopClosure* cl) { 474 cl->do_oop(&_java_mirror); 475 } 476 477 void Klass::remove_unshareable_info() { 478 assert (DumpSharedSpaces, "only called for DumpSharedSpaces"); 479 480 set_subklass(NULL); 481 set_next_sibling(NULL); 482 // Clear the java mirror 483 set_java_mirror(NULL); 484 set_next_link(NULL); 485 486 // Null out class_loader_data because we don't share that yet. 487 set_class_loader_data(NULL); 488 } 489 490 void Klass::restore_unshareable_info(TRAPS) { 491 // If an exception happened during CDS restore, some of these fields may already be 492 // set. We leave the class on the CLD list, even if incomplete so that we don't 493 // modify the CLD list outside a safepoint. 494 if (class_loader_data() == NULL) { 495 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 496 // Restore class_loader_data to the null class loader data 497 set_class_loader_data(loader_data); 498 499 // Add to null class loader list first before creating the mirror 500 // (same order as class file parsing) 501 loader_data->add_class(this); 502 } 503 504 // Recreate the class mirror. The protection_domain is always null for 505 // boot loader, for now. 506 // Only recreate it if not present. A previous attempt to restore may have 507 // gotten an OOM later but keep the mirror if it was created. 508 if (java_mirror() == NULL) { 509 java_lang_Class::create_mirror(this, Handle(NULL), CHECK); 510 } 511 } 512 513 Klass* Klass::array_klass_or_null(int rank) { 514 EXCEPTION_MARK; 515 // No exception can be thrown by array_klass_impl when called with or_null == true. 516 // (In anycase, the execption mark will fail if it do so) 517 return array_klass_impl(true, rank, THREAD); 518 } 519 520 521 Klass* Klass::array_klass_or_null() { 522 EXCEPTION_MARK; 523 // No exception can be thrown by array_klass_impl when called with or_null == true. 524 // (In anycase, the execption mark will fail if it do so) 525 return array_klass_impl(true, THREAD); 526 } 527 528 529 Klass* Klass::array_klass_impl(bool or_null, int rank, TRAPS) { 530 fatal("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass"); 531 return NULL; 532 } 533 534 535 Klass* Klass::array_klass_impl(bool or_null, TRAPS) { 536 fatal("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass"); 537 return NULL; 538 } 539 540 oop Klass::class_loader() const { return class_loader_data()->class_loader(); } 541 542 const char* Klass::external_name() const { 543 if (oop_is_instance()) { 544 InstanceKlass* ik = (InstanceKlass*) this; 545 if (ik->is_anonymous()) { 546 assert(EnableInvokeDynamic, ""); 547 intptr_t hash = 0; 548 if (ik->java_mirror() != NULL) { 549 // java_mirror might not be created yet, return 0 as hash. 550 hash = ik->java_mirror()->identity_hash(); 551 } 552 char hash_buf[40]; 553 sprintf(hash_buf, "/" UINTX_FORMAT, (uintx)hash); 554 size_t hash_len = strlen(hash_buf); 555 556 size_t result_len = name()->utf8_length(); 557 char* result = NEW_RESOURCE_ARRAY(char, result_len + hash_len + 1); 558 name()->as_klass_external_name(result, (int) result_len + 1); 559 assert(strlen(result) == result_len, ""); 560 strcpy(result + result_len, hash_buf); 561 assert(strlen(result) == result_len + hash_len, ""); 562 return result; 563 } 564 } 565 if (name() == NULL) return "<unknown>"; 566 return name()->as_klass_external_name(); 567 } 568 569 570 const char* Klass::signature_name() const { 571 if (name() == NULL) return "<unknown>"; 572 return name()->as_C_string(); 573 } 574 575 // Unless overridden, modifier_flags is 0. 576 jint Klass::compute_modifier_flags(TRAPS) const { 577 return 0; 578 } 579 580 int Klass::atomic_incr_biased_lock_revocation_count() { 581 return (int) Atomic::add(1, &_biased_lock_revocation_count); 582 } 583 584 // Unless overridden, jvmti_class_status has no flags set. 585 jint Klass::jvmti_class_status() const { 586 return 0; 587 } 588 589 590 // Printing 591 592 void Klass::print_on(outputStream* st) const { 593 ResourceMark rm; 594 // print title 595 st->print("%s", internal_name()); 596 print_address_on(st); 597 st->cr(); 598 } 599 600 void Klass::oop_print_on(oop obj, outputStream* st) { 601 ResourceMark rm; 602 // print title 603 st->print_cr("%s ", internal_name()); 604 obj->print_address_on(st); 605 606 if (WizardMode) { 607 // print header 608 obj->mark()->print_on(st); 609 } 610 611 // print class 612 st->print(" - klass: "); 613 obj->klass()->print_value_on(st); 614 st->cr(); 615 } 616 617 void Klass::oop_print_value_on(oop obj, outputStream* st) { 618 // print title 619 ResourceMark rm; // Cannot print in debug mode without this 620 st->print("%s", internal_name()); 621 obj->print_address_on(st); 622 } 623 624 #if INCLUDE_SERVICES 625 // Size Statistics 626 void Klass::collect_statistics(KlassSizeStats *sz) const { 627 sz->_klass_bytes = sz->count(this); 628 sz->_mirror_bytes = sz->count(java_mirror()); 629 sz->_secondary_supers_bytes = sz->count_array(secondary_supers()); 630 631 sz->_ro_bytes += sz->_secondary_supers_bytes; 632 sz->_rw_bytes += sz->_klass_bytes + sz->_mirror_bytes; 633 } 634 #endif // INCLUDE_SERVICES 635 636 // Verification 637 638 void Klass::verify_on(outputStream* st) { 639 640 // This can be expensive, but it is worth checking that this klass is actually 641 // in the CLD graph but not in production. 642 assert(ClassLoaderDataGraph::contains((address)this), "Should be"); 643 644 guarantee(this->is_klass(),"should be klass"); 645 646 if (super() != NULL) { 647 guarantee(super()->is_klass(), "should be klass"); 648 } 649 if (secondary_super_cache() != NULL) { 650 Klass* ko = secondary_super_cache(); 651 guarantee(ko->is_klass(), "should be klass"); 652 } 653 for ( uint i = 0; i < primary_super_limit(); i++ ) { 654 Klass* ko = _primary_supers[i]; 655 if (ko != NULL) { 656 guarantee(ko->is_klass(), "should be klass"); 657 } 658 } 659 660 if (java_mirror() != NULL) { 661 guarantee(java_mirror()->is_oop(), "should be instance"); 662 } 663 } 664 665 void Klass::oop_verify_on(oop obj, outputStream* st) { 666 guarantee(obj->is_oop(), "should be oop"); 667 guarantee(obj->klass()->is_klass(), "klass field is not a klass"); 668 } 669 670 #ifndef PRODUCT 671 672 bool Klass::verify_vtable_index(int i) { 673 if (oop_is_instance()) { 674 int limit = ((InstanceKlass*)this)->vtable_length()/vtableEntry::size(); 675 assert(i >= 0 && i < limit, err_msg("index %d out of bounds %d", i, limit)); 676 } else { 677 assert(oop_is_array(), "Must be"); 678 int limit = ((ArrayKlass*)this)->vtable_length()/vtableEntry::size(); 679 assert(i >= 0 && i < limit, err_msg("index %d out of bounds %d", i, limit)); 680 } 681 return true; 682 } 683 684 bool Klass::verify_itable_index(int i) { 685 assert(oop_is_instance(), ""); 686 int method_count = klassItable::method_count_for_interface(this); 687 assert(i >= 0 && i < method_count, "index out of bounds"); 688 return true; 689 } 690 691 #endif 692 693 /////////////// Unit tests /////////////// 694 695 #ifndef PRODUCT 696 697 class TestKlass { 698 public: 699 static void test_oop_is_instanceClassLoader() { 700 assert(SystemDictionary::ClassLoader_klass()->oop_is_instanceClassLoader(), "assert"); 701 assert(!SystemDictionary::String_klass()->oop_is_instanceClassLoader(), "assert"); 702 } 703 }; 704 705 void TestKlass_test() { 706 TestKlass::test_oop_is_instanceClassLoader(); 707 } 708 709 #endif