1 /* 2 * Copyright (c) 2002, 2015, 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/classLoaderData.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "gc/shared/collectedHeap.hpp" 29 #include "gc/shared/genCollectedHeap.hpp" 30 #include "memory/heapInspection.hpp" 31 #include "memory/resourceArea.hpp" 32 #include "oops/oop.inline.hpp" 33 #include "runtime/os.hpp" 34 #include "utilities/globalDefinitions.hpp" 35 #include "utilities/macros.hpp" 36 #include "utilities/stack.inline.hpp" 37 #if INCLUDE_ALL_GCS 38 #include "gc/parallel/parallelScavengeHeap.hpp" 39 #endif // INCLUDE_ALL_GCS 40 41 // HeapInspection 42 43 inline KlassInfoEntry::~KlassInfoEntry() { 44 if (_subclasses != NULL) { 45 delete _subclasses; 46 } 47 } 48 49 inline void KlassInfoEntry::add_subclass(KlassInfoEntry* cie) { 50 if (_subclasses == NULL) { 51 _subclasses = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<KlassInfoEntry*>(4, true); 52 } 53 _subclasses->append(cie); 54 } 55 56 int KlassInfoEntry::compare(KlassInfoEntry* e1, KlassInfoEntry* e2) { 57 if(e1->_instance_words > e2->_instance_words) { 58 return -1; 59 } else if(e1->_instance_words < e2->_instance_words) { 60 return 1; 61 } 62 // Sort alphabetically, note 'Z' < '[' < 'a', but it's better to group 63 // the array classes before all the instance classes. 64 ResourceMark rm; 65 const char* name1 = e1->klass()->external_name(); 66 const char* name2 = e2->klass()->external_name(); 67 bool d1 = (name1[0] == '['); 68 bool d2 = (name2[0] == '['); 69 if (d1 && !d2) { 70 return -1; 71 } else if (d2 && !d1) { 72 return 1; 73 } else { 74 return strcmp(name1, name2); 75 } 76 } 77 78 const char* KlassInfoEntry::name() const { 79 const char* name; 80 if (_klass->name() != NULL) { 81 name = _klass->external_name(); 82 } else { 83 if (_klass == Universe::boolArrayKlassObj()) name = "<boolArrayKlass>"; else 84 if (_klass == Universe::charArrayKlassObj()) name = "<charArrayKlass>"; else 85 if (_klass == Universe::singleArrayKlassObj()) name = "<singleArrayKlass>"; else 86 if (_klass == Universe::doubleArrayKlassObj()) name = "<doubleArrayKlass>"; else 87 if (_klass == Universe::byteArrayKlassObj()) name = "<byteArrayKlass>"; else 88 if (_klass == Universe::shortArrayKlassObj()) name = "<shortArrayKlass>"; else 89 if (_klass == Universe::intArrayKlassObj()) name = "<intArrayKlass>"; else 90 if (_klass == Universe::longArrayKlassObj()) name = "<longArrayKlass>"; else 91 name = "<no name>"; 92 } 93 return name; 94 } 95 96 void KlassInfoEntry::print_on(outputStream* st) const { 97 ResourceMark rm; 98 99 // simplify the formatting (ILP32 vs LP64) - always cast the numbers to 64-bit 100 st->print_cr(INT64_FORMAT_W(13) " " UINT64_FORMAT_W(13) " %s", 101 (int64_t)_instance_count, 102 (uint64_t)_instance_words * HeapWordSize, 103 name()); 104 } 105 106 KlassInfoEntry* KlassInfoBucket::lookup(Klass* const k) { 107 KlassInfoEntry* elt = _list; 108 while (elt != NULL) { 109 if (elt->is_equal(k)) { 110 return elt; 111 } 112 elt = elt->next(); 113 } 114 elt = new (std::nothrow) KlassInfoEntry(k, list()); 115 // We may be out of space to allocate the new entry. 116 if (elt != NULL) { 117 set_list(elt); 118 } 119 return elt; 120 } 121 122 void KlassInfoBucket::iterate(KlassInfoClosure* cic) { 123 KlassInfoEntry* elt = _list; 124 while (elt != NULL) { 125 cic->do_cinfo(elt); 126 elt = elt->next(); 127 } 128 } 129 130 void KlassInfoBucket::empty() { 131 KlassInfoEntry* elt = _list; 132 _list = NULL; 133 while (elt != NULL) { 134 KlassInfoEntry* next = elt->next(); 135 delete elt; 136 elt = next; 137 } 138 } 139 140 void KlassInfoTable::AllClassesFinder::do_klass(Klass* k) { 141 // This has the SIDE EFFECT of creating a KlassInfoEntry 142 // for <k>, if one doesn't exist yet. 143 _table->lookup(k); 144 } 145 146 KlassInfoTable::KlassInfoTable(bool add_all_classes) { 147 _size_of_instances_in_words = 0; 148 _size = 0; 149 _ref = (HeapWord*) Universe::boolArrayKlassObj(); 150 _buckets = 151 (KlassInfoBucket*) AllocateHeap(sizeof(KlassInfoBucket) * _num_buckets, 152 mtInternal, CURRENT_PC, AllocFailStrategy::RETURN_NULL); 153 if (_buckets != NULL) { 154 _size = _num_buckets; 155 for (int index = 0; index < _size; index++) { 156 _buckets[index].initialize(); 157 } 158 if (add_all_classes) { 159 AllClassesFinder finder(this); 160 ClassLoaderDataGraph::classes_do(&finder); 161 } 162 } 163 } 164 165 KlassInfoTable::~KlassInfoTable() { 166 if (_buckets != NULL) { 167 for (int index = 0; index < _size; index++) { 168 _buckets[index].empty(); 169 } 170 FREE_C_HEAP_ARRAY(KlassInfoBucket, _buckets); 171 _size = 0; 172 } 173 } 174 175 uint KlassInfoTable::hash(const Klass* p) { 176 return (uint)(((uintptr_t)p - (uintptr_t)_ref) >> 2); 177 } 178 179 KlassInfoEntry* KlassInfoTable::lookup(Klass* k) { 180 uint idx = hash(k) % _size; 181 assert(_buckets != NULL, "Allocation failure should have been caught"); 182 KlassInfoEntry* e = _buckets[idx].lookup(k); 183 // Lookup may fail if this is a new klass for which we 184 // could not allocate space for an new entry. 185 assert(e == NULL || k == e->klass(), "must be equal"); 186 return e; 187 } 188 189 // Return false if the entry could not be recorded on account 190 // of running out of space required to create a new entry. 191 bool KlassInfoTable::record_instance(const oop obj) { 192 Klass* k = obj->klass(); 193 KlassInfoEntry* elt = lookup(k); 194 // elt may be NULL if it's a new klass for which we 195 // could not allocate space for a new entry in the hashtable. 196 if (elt != NULL) { 197 elt->set_count(elt->count() + 1); 198 elt->set_words(elt->words() + obj->size()); 199 _size_of_instances_in_words += obj->size(); 200 return true; 201 } else { 202 return false; 203 } 204 } 205 206 void KlassInfoTable::iterate(KlassInfoClosure* cic) { 207 assert(_size == 0 || _buckets != NULL, "Allocation failure should have been caught"); 208 for (int index = 0; index < _size; index++) { 209 _buckets[index].iterate(cic); 210 } 211 } 212 213 size_t KlassInfoTable::size_of_instances_in_words() const { 214 return _size_of_instances_in_words; 215 } 216 217 int KlassInfoHisto::sort_helper(KlassInfoEntry** e1, KlassInfoEntry** e2) { 218 return (*e1)->compare(*e1,*e2); 219 } 220 221 KlassInfoHisto::KlassInfoHisto(KlassInfoTable* cit, const char* title) : 222 _cit(cit), 223 _title(title) { 224 _elements = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<KlassInfoEntry*>(_histo_initial_size, true); 225 } 226 227 KlassInfoHisto::~KlassInfoHisto() { 228 delete _elements; 229 } 230 231 void KlassInfoHisto::add(KlassInfoEntry* cie) { 232 elements()->append(cie); 233 } 234 235 void KlassInfoHisto::sort() { 236 elements()->sort(KlassInfoHisto::sort_helper); 237 } 238 239 void KlassInfoHisto::print_elements(outputStream* st) const { 240 // simplify the formatting (ILP32 vs LP64) - store the sum in 64-bit 241 int64_t total = 0; 242 uint64_t totalw = 0; 243 for(int i=0; i < elements()->length(); i++) { 244 st->print("%4d: ", i+1); 245 elements()->at(i)->print_on(st); 246 total += elements()->at(i)->count(); 247 totalw += elements()->at(i)->words(); 248 } 249 st->print_cr("Total " INT64_FORMAT_W(13) " " UINT64_FORMAT_W(13), 250 total, totalw * HeapWordSize); 251 } 252 253 #define MAKE_COL_NAME(field, name, help) #name, 254 #define MAKE_COL_HELP(field, name, help) help, 255 256 static const char *name_table[] = { 257 HEAP_INSPECTION_COLUMNS_DO(MAKE_COL_NAME) 258 }; 259 260 static const char *help_table[] = { 261 HEAP_INSPECTION_COLUMNS_DO(MAKE_COL_HELP) 262 }; 263 264 bool KlassInfoHisto::is_selected(const char *col_name) { 265 if (_selected_columns == NULL) { 266 return true; 267 } 268 if (strcmp(_selected_columns, col_name) == 0) { 269 return true; 270 } 271 272 const char *start = strstr(_selected_columns, col_name); 273 if (start == NULL) { 274 return false; 275 } 276 277 // The following must be true, because _selected_columns != col_name 278 if (start > _selected_columns && start[-1] != ',') { 279 return false; 280 } 281 char x = start[strlen(col_name)]; 282 if (x != ',' && x != '\0') { 283 return false; 284 } 285 286 return true; 287 } 288 289 void KlassInfoHisto::print_title(outputStream* st, bool csv_format, 290 bool selected[], int width_table[], 291 const char *name_table[]) { 292 if (csv_format) { 293 st->print("Index,Super"); 294 for (int c=0; c<KlassSizeStats::_num_columns; c++) { 295 if (selected[c]) {st->print(",%s", name_table[c]);} 296 } 297 st->print(",ClassName"); 298 } else { 299 st->print("Index Super"); 300 for (int c = 0; c < KlassSizeStats::_num_columns; c++) { 301 if (selected[c]) { 302 st->print("%*s", width_table[c], name_table[c]); 303 } 304 } 305 st->print(" ClassName"); 306 } 307 308 if (is_selected("ClassLoader")) { 309 st->print(",ClassLoader"); 310 } 311 st->cr(); 312 } 313 314 class HierarchyClosure : public KlassInfoClosure { 315 private: 316 GrowableArray<KlassInfoEntry*> *_elements; 317 public: 318 HierarchyClosure(GrowableArray<KlassInfoEntry*> *_elements) : _elements(_elements) {} 319 320 void do_cinfo(KlassInfoEntry* cie) { 321 // ignore array classes 322 if (cie->klass()->is_instance_klass()) { 323 _elements->append(cie); 324 } 325 } 326 }; 327 328 void KlassHierarchy::print_class_hierarchy(outputStream* st, bool print_interfaces, 329 bool print_subclasses, char* classname) { 330 ResourceMark rm; 331 Stack <KlassInfoEntry*, mtClass> class_stack; 332 GrowableArray<KlassInfoEntry*> elements; 333 334 // Add all classes to the KlassInfoTable, which allows for quick lookup. 335 // A KlassInfoEntry will be created for each class. 336 KlassInfoTable cit(true); 337 if (cit.allocation_failed()) { 338 st->print_cr("ERROR: Ran out of C-heap; hierarchy not generated"); 339 return; 340 } 341 342 // Add all created KlassInfoEntry instances to the elements array for easy 343 // iteration, and to allow each KlassInfoEntry instance to have a unique index. 344 HierarchyClosure hc(&elements); 345 cit.iterate(&hc); 346 347 for(int i = 0; i < elements.length(); i++) { 348 KlassInfoEntry* cie = elements.at(i); 349 Klass* super = cie->klass()->super(); 350 351 // Set the index for the class. 352 cie->set_index(i + 1); 353 354 // Add the class to the subclass array of its superclass. 355 if (super != NULL) { 356 KlassInfoEntry* super_cie = cit.lookup(super); 357 assert(super_cie != NULL, "could not lookup superclass"); 358 super_cie->add_subclass(cie); 359 } 360 } 361 362 // Set the do_print flag for each class that should be printed. 363 for(int i = 0; i < elements.length(); i++) { 364 KlassInfoEntry* cie = elements.at(i); 365 if (classname == NULL) { 366 // We are printing all classes. 367 cie->set_do_print(true); 368 } else { 369 // We are only printing the hierarchy of a specific class. 370 if (strcmp(classname, cie->klass()->external_name()) == 0) { 371 KlassHierarchy::set_do_print_for_class_hierarchy(cie, &cit, print_subclasses); 372 } 373 } 374 } 375 376 // Now we do a depth first traversal of the class hierachry. The class_stack will 377 // maintain the list of classes we still need to process. Start things off 378 // by priming it with java.lang.Object. 379 KlassInfoEntry* jlo_cie = cit.lookup(SystemDictionary::Object_klass()); 380 assert(jlo_cie != NULL, "could not lookup java.lang.Object"); 381 class_stack.push(jlo_cie); 382 383 // Repeatedly pop the top item off the stack, print its class info, 384 // and push all of its subclasses on to the stack. Do this until there 385 // are no classes left on the stack. 386 while (!class_stack.is_empty()) { 387 KlassInfoEntry* curr_cie = class_stack.pop(); 388 if (curr_cie->do_print()) { 389 print_class(st, curr_cie, print_interfaces); 390 if (curr_cie->subclasses() != NULL) { 391 // Current class has subclasses, so push all of them onto the stack. 392 for (int i = 0; i < curr_cie->subclasses()->length(); i++) { 393 KlassInfoEntry* cie = curr_cie->subclasses()->at(i); 394 if (cie->do_print()) { 395 class_stack.push(cie); 396 } 397 } 398 } 399 } 400 } 401 402 st->flush(); 403 } 404 405 // Sets the do_print flag for every superclass and subclass of the specified class. 406 void KlassHierarchy::set_do_print_for_class_hierarchy(KlassInfoEntry* cie, KlassInfoTable* cit, 407 bool print_subclasses) { 408 // Set do_print for all superclasses of this class. 409 Klass* super = ((InstanceKlass*)cie->klass())->java_super(); 410 while (super != NULL) { 411 KlassInfoEntry* super_cie = cit->lookup(super); 412 super_cie->set_do_print(true); 413 super = super->super(); 414 } 415 416 // Set do_print for this class and all of its subclasses. 417 Stack <KlassInfoEntry*, mtClass> class_stack; 418 class_stack.push(cie); 419 while (!class_stack.is_empty()) { 420 KlassInfoEntry* curr_cie = class_stack.pop(); 421 curr_cie->set_do_print(true); 422 if (print_subclasses && curr_cie->subclasses() != NULL) { 423 // Current class has subclasses, so push all of them onto the stack. 424 for (int i = 0; i < curr_cie->subclasses()->length(); i++) { 425 KlassInfoEntry* cie = curr_cie->subclasses()->at(i); 426 class_stack.push(cie); 427 } 428 } 429 } 430 } 431 432 static void print_indent(outputStream* st, int indent) { 433 while (indent != 0) { 434 st->print("|"); 435 indent--; 436 if (indent != 0) { 437 st->print(" "); 438 } 439 } 440 } 441 442 // Print the class name and its unique ClassLoader identifer. 443 static void print_classname(outputStream* st, Klass* klass) { 444 oop loader_oop = klass->class_loader_data()->class_loader(); 445 st->print("%s/", klass->external_name()); 446 if (loader_oop == NULL) { 447 st->print("null"); 448 } else { 449 st->print(INTPTR_FORMAT, p2i(klass->class_loader_data())); 450 } 451 } 452 453 static void print_interface(outputStream* st, Klass* intf_klass, const char* intf_type, int indent) { 454 print_indent(st, indent); 455 st->print(" implements "); 456 print_classname(st, intf_klass); 457 st->print(" (%s intf)\n", intf_type); 458 } 459 460 void KlassHierarchy::print_class(outputStream* st, KlassInfoEntry* cie, bool print_interfaces) { 461 ResourceMark rm; 462 InstanceKlass* klass = (InstanceKlass*)cie->klass(); 463 int indent = 0; 464 465 // Print indentation with proper indicators of superclass. 466 Klass* super = klass->super(); 467 while (super != NULL) { 468 super = super->super(); 469 indent++; 470 } 471 print_indent(st, indent); 472 if (indent != 0) st->print("--"); 473 474 // Print the class name, its unique ClassLoader identifer, and if it is an interface. 475 print_classname(st, klass); 476 if (klass->is_interface()) { 477 st->print(" (intf)"); 478 } 479 st->print("\n"); 480 481 // Print any interfaces the class has. 482 if (print_interfaces) { 483 Array<Klass*>* local_intfs = klass->local_interfaces(); 484 Array<Klass*>* trans_intfs = klass->transitive_interfaces(); 485 for (int i = 0; i < local_intfs->length(); i++) { 486 print_interface(st, local_intfs->at(i), "declared", indent); 487 } 488 for (int i = 0; i < trans_intfs->length(); i++) { 489 Klass* trans_interface = trans_intfs->at(i); 490 // Only print transitive interfaces if they are not also declared. 491 if (!local_intfs->contains(trans_interface)) { 492 print_interface(st, trans_interface, "inherited", indent); 493 } 494 } 495 } 496 } 497 498 void KlassInfoHisto::print_class_stats(outputStream* st, 499 bool csv_format, const char *columns) { 500 ResourceMark rm; 501 KlassSizeStats sz, sz_sum; 502 int i; 503 julong *col_table = (julong*)(&sz); 504 julong *colsum_table = (julong*)(&sz_sum); 505 int width_table[KlassSizeStats::_num_columns]; 506 bool selected[KlassSizeStats::_num_columns]; 507 508 _selected_columns = columns; 509 510 memset(&sz_sum, 0, sizeof(sz_sum)); 511 for (int c=0; c<KlassSizeStats::_num_columns; c++) { 512 selected[c] = is_selected(name_table[c]); 513 } 514 515 for(i=0; i < elements()->length(); i++) { 516 elements()->at(i)->set_index(i+1); 517 } 518 519 // First iteration is for accumulating stats totals in colsum_table[]. 520 // Second iteration is for printing stats for each class. 521 for (int pass=1; pass<=2; pass++) { 522 if (pass == 2) { 523 print_title(st, csv_format, selected, width_table, name_table); 524 } 525 for(i=0; i < elements()->length(); i++) { 526 KlassInfoEntry* e = (KlassInfoEntry*)elements()->at(i); 527 const Klass* k = e->klass(); 528 529 // Get the stats for this class. 530 memset(&sz, 0, sizeof(sz)); 531 sz._inst_count = e->count(); 532 sz._inst_bytes = HeapWordSize * e->words(); 533 k->collect_statistics(&sz); 534 sz._total_bytes = sz._ro_bytes + sz._rw_bytes; 535 536 if (pass == 1) { 537 // Add the stats for this class to the overall totals. 538 for (int c=0; c<KlassSizeStats::_num_columns; c++) { 539 colsum_table[c] += col_table[c]; 540 } 541 } else { 542 int super_index = -1; 543 // Print the stats for this class. 544 if (k->is_instance_klass()) { 545 Klass* super = k->super(); 546 if (super) { 547 KlassInfoEntry* super_e = _cit->lookup(super); 548 if (super_e) { 549 super_index = super_e->index(); 550 } 551 } 552 } 553 554 if (csv_format) { 555 st->print("%ld,%d", e->index(), super_index); 556 for (int c=0; c<KlassSizeStats::_num_columns; c++) { 557 if (selected[c]) {st->print("," JULONG_FORMAT, col_table[c]);} 558 } 559 st->print(",%s",e->name()); 560 } else { 561 st->print("%5ld %5d", e->index(), super_index); 562 for (int c=0; c<KlassSizeStats::_num_columns; c++) { 563 if (selected[c]) {print_julong(st, width_table[c], col_table[c]);} 564 } 565 st->print(" %s", e->name()); 566 } 567 if (is_selected("ClassLoader")) { 568 ClassLoaderData* loader_data = k->class_loader_data(); 569 st->print(","); 570 loader_data->print_value_on(st); 571 } 572 st->cr(); 573 } 574 } 575 576 if (pass == 1) { 577 // Calculate the minimum width needed for the column by accounting for the 578 // column header width and the width of the largest value in the column. 579 for (int c=0; c<KlassSizeStats::_num_columns; c++) { 580 width_table[c] = col_width(colsum_table[c], name_table[c]); 581 } 582 } 583 } 584 585 sz_sum._inst_size = 0; 586 587 // Print the column totals. 588 if (csv_format) { 589 st->print(","); 590 for (int c=0; c<KlassSizeStats::_num_columns; c++) { 591 if (selected[c]) {st->print("," JULONG_FORMAT, colsum_table[c]);} 592 } 593 } else { 594 st->print(" "); 595 for (int c=0; c<KlassSizeStats::_num_columns; c++) { 596 if (selected[c]) {print_julong(st, width_table[c], colsum_table[c]);} 597 } 598 st->print(" Total"); 599 if (sz_sum._total_bytes > 0) { 600 st->cr(); 601 st->print(" "); 602 for (int c=0; c<KlassSizeStats::_num_columns; c++) { 603 if (selected[c]) { 604 switch (c) { 605 case KlassSizeStats::_index_inst_size: 606 case KlassSizeStats::_index_inst_count: 607 case KlassSizeStats::_index_method_count: 608 st->print("%*s", width_table[c], "-"); 609 break; 610 default: 611 { 612 double perc = (double)(100) * (double)(colsum_table[c]) / (double)sz_sum._total_bytes; 613 st->print("%*.1f%%", width_table[c]-1, perc); 614 } 615 } 616 } 617 } 618 } 619 } 620 st->cr(); 621 622 if (!csv_format) { 623 print_title(st, csv_format, selected, width_table, name_table); 624 } 625 } 626 627 julong KlassInfoHisto::annotations_bytes(Array<AnnotationArray*>* p) const { 628 julong bytes = 0; 629 if (p != NULL) { 630 for (int i = 0; i < p->length(); i++) { 631 bytes += count_bytes_array(p->at(i)); 632 } 633 bytes += count_bytes_array(p); 634 } 635 return bytes; 636 } 637 638 void KlassInfoHisto::print_histo_on(outputStream* st, bool print_stats, 639 bool csv_format, const char *columns) { 640 if (print_stats) { 641 print_class_stats(st, csv_format, columns); 642 } else { 643 st->print_cr("%s",title()); 644 print_elements(st); 645 } 646 } 647 648 class HistoClosure : public KlassInfoClosure { 649 private: 650 KlassInfoHisto* _cih; 651 public: 652 HistoClosure(KlassInfoHisto* cih) : _cih(cih) {} 653 654 void do_cinfo(KlassInfoEntry* cie) { 655 _cih->add(cie); 656 } 657 }; 658 659 class RecordInstanceClosure : public ObjectClosure { 660 private: 661 KlassInfoTable* _cit; 662 size_t _missed_count; 663 BoolObjectClosure* _filter; 664 public: 665 RecordInstanceClosure(KlassInfoTable* cit, BoolObjectClosure* filter) : 666 _cit(cit), _missed_count(0), _filter(filter) {} 667 668 void do_object(oop obj) { 669 if (should_visit(obj)) { 670 if (!_cit->record_instance(obj)) { 671 _missed_count++; 672 } 673 } 674 } 675 676 size_t missed_count() { return _missed_count; } 677 678 private: 679 bool should_visit(oop obj) { 680 return _filter == NULL || _filter->do_object_b(obj); 681 } 682 }; 683 684 size_t HeapInspection::populate_table(KlassInfoTable* cit, BoolObjectClosure *filter) { 685 ResourceMark rm; 686 687 RecordInstanceClosure ric(cit, filter); 688 Universe::heap()->object_iterate(&ric); 689 return ric.missed_count(); 690 } 691 692 void HeapInspection::heap_inspection(outputStream* st) { 693 ResourceMark rm; 694 695 if (_print_help) { 696 for (int c=0; c<KlassSizeStats::_num_columns; c++) { 697 st->print("%s:\n\t", name_table[c]); 698 const int max_col = 60; 699 int col = 0; 700 for (const char *p = help_table[c]; *p; p++,col++) { 701 if (col >= max_col && *p == ' ') { 702 st->print("\n\t"); 703 col = 0; 704 } else { 705 st->print("%c", *p); 706 } 707 } 708 st->print_cr(".\n"); 709 } 710 return; 711 } 712 713 KlassInfoTable cit(_print_class_stats); 714 if (!cit.allocation_failed()) { 715 // populate table with object allocation info 716 size_t missed_count = populate_table(&cit); 717 if (missed_count != 0) { 718 st->print_cr("WARNING: Ran out of C-heap; undercounted " SIZE_FORMAT 719 " total instances in data below", 720 missed_count); 721 } 722 723 // Sort and print klass instance info 724 const char *title = "\n" 725 " num #instances #bytes class name\n" 726 "----------------------------------------------"; 727 KlassInfoHisto histo(&cit, title); 728 HistoClosure hc(&histo); 729 730 cit.iterate(&hc); 731 732 histo.sort(); 733 histo.print_histo_on(st, _print_class_stats, _csv_format, _columns); 734 } else { 735 st->print_cr("ERROR: Ran out of C-heap; histogram not generated"); 736 } 737 st->flush(); 738 } 739 740 class FindInstanceClosure : public ObjectClosure { 741 private: 742 Klass* _klass; 743 GrowableArray<oop>* _result; 744 745 public: 746 FindInstanceClosure(Klass* k, GrowableArray<oop>* result) : _klass(k), _result(result) {}; 747 748 void do_object(oop obj) { 749 if (obj->is_a(_klass)) { 750 _result->append(obj); 751 } 752 } 753 }; 754 755 void HeapInspection::find_instances_at_safepoint(Klass* k, GrowableArray<oop>* result) { 756 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); 757 assert(Heap_lock->is_locked(), "should have the Heap_lock"); 758 759 // Ensure that the heap is parsable 760 Universe::heap()->ensure_parsability(false); // no need to retire TALBs 761 762 // Iterate over objects in the heap 763 FindInstanceClosure fic(k, result); 764 // If this operation encounters a bad object when using CMS, 765 // consider using safe_object_iterate() which avoids metadata 766 // objects that may contain bad references. 767 Universe::heap()->object_iterate(&fic); 768 }