Mercurial > hg > truffle
annotate src/share/vm/memory/heapInspection.cpp @ 10265:92ef81e2f571
8003557: NPG: Klass* const k should be const Klass* k.
Summary: With NPG, const KlassOop klass which is in fact a definition converted to Klass* const, which is not the original intention. The right usage is converting them to const Klass*.
Reviewed-by: coleenp, kvn
Contributed-by: yumin.qi@oracle.com
| author | minqi |
|---|---|
| date | Fri, 10 May 2013 08:27:30 -0700 |
| parents | 3c9bc17b9403 |
| children | f2110083203d |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 7956 | 2 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 7956 | 26 #include "classfile/classLoaderData.hpp" |
| 1972 | 27 #include "gc_interface/collectedHeap.hpp" |
| 28 #include "memory/genCollectedHeap.hpp" | |
| 29 #include "memory/heapInspection.hpp" | |
| 30 #include "memory/resourceArea.hpp" | |
| 31 #include "runtime/os.hpp" | |
| 32 #include "utilities/globalDefinitions.hpp" | |
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33 #include "utilities/macros.hpp" |
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34 #if INCLUDE_ALL_GCS |
| 1972 | 35 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
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36 #endif // INCLUDE_ALL_GCS |
| 0 | 37 |
| 38 // HeapInspection | |
| 39 | |
| 40 int KlassInfoEntry::compare(KlassInfoEntry* e1, KlassInfoEntry* e2) { | |
| 41 if(e1->_instance_words > e2->_instance_words) { | |
| 42 return -1; | |
| 43 } else if(e1->_instance_words < e2->_instance_words) { | |
| 44 return 1; | |
| 45 } | |
| 7956 | 46 // Sort alphabetically, note 'Z' < '[' < 'a', but it's better to group |
| 47 // the array classes before all the instance classes. | |
| 48 ResourceMark rm; | |
| 49 const char* name1 = e1->klass()->external_name(); | |
| 50 const char* name2 = e2->klass()->external_name(); | |
| 51 bool d1 = (name1[0] == '['); | |
| 52 bool d2 = (name2[0] == '['); | |
| 53 if (d1 && !d2) { | |
| 54 return -1; | |
| 55 } else if (d2 && !d1) { | |
| 56 return 1; | |
| 57 } else { | |
| 58 return strcmp(name1, name2); | |
| 59 } | |
| 0 | 60 } |
| 61 | |
| 7956 | 62 const char* KlassInfoEntry::name() const { |
| 63 const char* name; | |
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64 if (_klass->name() != NULL) { |
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65 name = _klass->external_name(); |
| 0 | 66 } else { |
| 67 if (_klass == Universe::boolArrayKlassObj()) name = "<boolArrayKlass>"; else | |
| 68 if (_klass == Universe::charArrayKlassObj()) name = "<charArrayKlass>"; else | |
| 69 if (_klass == Universe::singleArrayKlassObj()) name = "<singleArrayKlass>"; else | |
| 70 if (_klass == Universe::doubleArrayKlassObj()) name = "<doubleArrayKlass>"; else | |
| 71 if (_klass == Universe::byteArrayKlassObj()) name = "<byteArrayKlass>"; else | |
| 72 if (_klass == Universe::shortArrayKlassObj()) name = "<shortArrayKlass>"; else | |
| 73 if (_klass == Universe::intArrayKlassObj()) name = "<intArrayKlass>"; else | |
| 74 if (_klass == Universe::longArrayKlassObj()) name = "<longArrayKlass>"; else | |
| 75 name = "<no name>"; | |
| 76 } | |
| 7956 | 77 return name; |
| 78 } | |
| 79 | |
| 80 void KlassInfoEntry::print_on(outputStream* st) const { | |
| 81 ResourceMark rm; | |
| 82 | |
| 0 | 83 // simplify the formatting (ILP32 vs LP64) - always cast the numbers to 64-bit |
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84 st->print_cr(INT64_FORMAT_W(13) " " UINT64_FORMAT_W(13) " %s", |
| 0 | 85 (jlong) _instance_count, |
| 86 (julong) _instance_words * HeapWordSize, | |
| 7956 | 87 name()); |
| 0 | 88 } |
| 89 | |
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90 KlassInfoEntry* KlassInfoBucket::lookup(Klass* const k) { |
| 0 | 91 KlassInfoEntry* elt = _list; |
| 92 while (elt != NULL) { | |
| 93 if (elt->is_equal(k)) { | |
| 94 return elt; | |
| 95 } | |
| 96 elt = elt->next(); | |
| 97 } | |
| 98 elt = new KlassInfoEntry(k, list()); | |
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99 // We may be out of space to allocate the new entry. |
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100 if (elt != NULL) { |
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101 set_list(elt); |
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102 } |
| 0 | 103 return elt; |
| 104 } | |
| 105 | |
| 106 void KlassInfoBucket::iterate(KlassInfoClosure* cic) { | |
| 107 KlassInfoEntry* elt = _list; | |
| 108 while (elt != NULL) { | |
| 109 cic->do_cinfo(elt); | |
| 110 elt = elt->next(); | |
| 111 } | |
| 112 } | |
| 113 | |
| 114 void KlassInfoBucket::empty() { | |
| 115 KlassInfoEntry* elt = _list; | |
| 116 _list = NULL; | |
| 117 while (elt != NULL) { | |
| 118 KlassInfoEntry* next = elt->next(); | |
| 119 delete elt; | |
| 120 elt = next; | |
| 121 } | |
| 122 } | |
| 123 | |
| 7956 | 124 void KlassInfoTable::AllClassesFinder::do_klass(Klass* k) { |
| 125 // This has the SIDE EFFECT of creating a KlassInfoEntry | |
| 126 // for <k>, if one doesn't exist yet. | |
| 127 _table->lookup(k); | |
| 128 } | |
| 129 | |
| 130 KlassInfoTable::KlassInfoTable(int size, HeapWord* ref, | |
| 131 bool need_class_stats) { | |
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132 _size = 0; |
| 0 | 133 _ref = ref; |
| 6197 | 134 _buckets = NEW_C_HEAP_ARRAY(KlassInfoBucket, size, mtInternal); |
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135 if (_buckets != NULL) { |
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136 _size = size; |
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137 for (int index = 0; index < _size; index++) { |
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138 _buckets[index].initialize(); |
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139 } |
| 7956 | 140 if (need_class_stats) { |
| 141 AllClassesFinder finder(this); | |
| 142 ClassLoaderDataGraph::classes_do(&finder); | |
| 143 } | |
| 0 | 144 } |
| 145 } | |
| 146 | |
| 147 KlassInfoTable::~KlassInfoTable() { | |
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148 if (_buckets != NULL) { |
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149 for (int index = 0; index < _size; index++) { |
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150 _buckets[index].empty(); |
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151 } |
| 6197 | 152 FREE_C_HEAP_ARRAY(KlassInfoBucket, _buckets, mtInternal); |
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153 _size = 0; |
| 0 | 154 } |
| 155 } | |
| 156 | |
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157 uint KlassInfoTable::hash(const Klass* p) { |
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158 assert(p->is_metadata(), "all klasses are metadata"); |
| 0 | 159 return (uint)(((uintptr_t)p - (uintptr_t)_ref) >> 2); |
| 160 } | |
| 161 | |
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162 KlassInfoEntry* KlassInfoTable::lookup(Klass* k) { |
| 0 | 163 uint idx = hash(k) % _size; |
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164 assert(_buckets != NULL, "Allocation failure should have been caught"); |
| 0 | 165 KlassInfoEntry* e = _buckets[idx].lookup(k); |
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166 // Lookup may fail if this is a new klass for which we |
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167 // could not allocate space for an new entry. |
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168 assert(e == NULL || k == e->klass(), "must be equal"); |
| 0 | 169 return e; |
| 170 } | |
| 171 | |
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172 // Return false if the entry could not be recorded on account |
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173 // of running out of space required to create a new entry. |
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174 bool KlassInfoTable::record_instance(const oop obj) { |
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175 Klass* k = obj->klass(); |
| 0 | 176 KlassInfoEntry* elt = lookup(k); |
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177 // elt may be NULL if it's a new klass for which we |
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178 // could not allocate space for a new entry in the hashtable. |
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179 if (elt != NULL) { |
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180 elt->set_count(elt->count() + 1); |
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181 elt->set_words(elt->words() + obj->size()); |
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182 return true; |
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183 } else { |
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184 return false; |
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185 } |
| 0 | 186 } |
| 187 | |
| 188 void KlassInfoTable::iterate(KlassInfoClosure* cic) { | |
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189 assert(_size == 0 || _buckets != NULL, "Allocation failure should have been caught"); |
| 0 | 190 for (int index = 0; index < _size; index++) { |
| 191 _buckets[index].iterate(cic); | |
| 192 } | |
| 193 } | |
| 194 | |
| 195 int KlassInfoHisto::sort_helper(KlassInfoEntry** e1, KlassInfoEntry** e2) { | |
| 196 return (*e1)->compare(*e1,*e2); | |
| 197 } | |
| 198 | |
| 7956 | 199 KlassInfoHisto::KlassInfoHisto(KlassInfoTable* cit, const char* title, int estimatedCount) : |
| 200 _cit(cit), | |
| 0 | 201 _title(title) { |
| 6197 | 202 _elements = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<KlassInfoEntry*>(estimatedCount,true); |
| 0 | 203 } |
| 204 | |
| 205 KlassInfoHisto::~KlassInfoHisto() { | |
| 206 delete _elements; | |
| 207 } | |
| 208 | |
| 209 void KlassInfoHisto::add(KlassInfoEntry* cie) { | |
| 210 elements()->append(cie); | |
| 211 } | |
| 212 | |
| 213 void KlassInfoHisto::sort() { | |
| 214 elements()->sort(KlassInfoHisto::sort_helper); | |
| 215 } | |
| 216 | |
| 217 void KlassInfoHisto::print_elements(outputStream* st) const { | |
| 218 // simplify the formatting (ILP32 vs LP64) - store the sum in 64-bit | |
| 219 jlong total = 0; | |
| 220 julong totalw = 0; | |
| 221 for(int i=0; i < elements()->length(); i++) { | |
| 222 st->print("%4d: ", i+1); | |
| 223 elements()->at(i)->print_on(st); | |
| 224 total += elements()->at(i)->count(); | |
| 225 totalw += elements()->at(i)->words(); | |
| 226 } | |
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227 st->print_cr("Total " INT64_FORMAT_W(13) " " UINT64_FORMAT_W(13), |
| 0 | 228 total, totalw * HeapWordSize); |
| 229 } | |
| 230 | |
| 7956 | 231 #define MAKE_COL_NAME(field, name, help) #name, |
| 232 #define MAKE_COL_HELP(field, name, help) help, | |
| 233 | |
| 234 static const char *name_table[] = { | |
| 235 HEAP_INSPECTION_COLUMNS_DO(MAKE_COL_NAME) | |
| 236 }; | |
| 237 | |
| 238 static const char *help_table[] = { | |
| 239 HEAP_INSPECTION_COLUMNS_DO(MAKE_COL_HELP) | |
| 240 }; | |
| 241 | |
| 242 bool KlassInfoHisto::is_selected(const char *col_name) { | |
| 243 if (_selected_columns == NULL) { | |
| 244 return true; | |
| 245 } | |
| 246 if (strcmp(_selected_columns, col_name) == 0) { | |
| 247 return true; | |
| 248 } | |
| 249 | |
| 250 const char *start = strstr(_selected_columns, col_name); | |
| 251 if (start == NULL) { | |
| 252 return false; | |
| 253 } | |
| 254 | |
| 255 // The following must be true, because _selected_columns != col_name | |
| 256 if (start > _selected_columns && start[-1] != ',') { | |
| 257 return false; | |
| 258 } | |
| 259 char x = start[strlen(col_name)]; | |
| 260 if (x != ',' && x != '\0') { | |
| 261 return false; | |
| 262 } | |
| 263 | |
| 264 return true; | |
| 265 } | |
| 266 | |
| 267 void KlassInfoHisto::print_title(outputStream* st, bool csv_format, | |
| 268 bool selected[], int width_table[], | |
| 269 const char *name_table[]) { | |
| 270 if (csv_format) { | |
| 271 st->print("Index,Super"); | |
| 272 for (int c=0; c<KlassSizeStats::_num_columns; c++) { | |
| 273 if (selected[c]) {st->print(",%s", name_table[c]);} | |
| 274 } | |
| 275 st->print(",ClassName"); | |
| 276 } else { | |
| 277 st->print("Index Super"); | |
| 278 for (int c=0; c<KlassSizeStats::_num_columns; c++) { | |
| 279 if (selected[c]) {st->print(str_fmt(width_table[c]), name_table[c]);} | |
| 280 } | |
| 281 st->print(" ClassName"); | |
| 282 } | |
| 283 | |
| 284 if (is_selected("ClassLoader")) { | |
| 285 st->print(",ClassLoader"); | |
| 286 } | |
| 287 st->cr(); | |
| 288 } | |
| 289 | |
| 290 void KlassInfoHisto::print_class_stats(outputStream* st, | |
| 291 bool csv_format, const char *columns) { | |
| 292 ResourceMark rm; | |
| 293 KlassSizeStats sz, sz_sum; | |
| 294 int i; | |
| 295 julong *col_table = (julong*)(&sz); | |
| 296 julong *colsum_table = (julong*)(&sz_sum); | |
| 297 int width_table[KlassSizeStats::_num_columns]; | |
| 298 bool selected[KlassSizeStats::_num_columns]; | |
| 299 | |
| 300 _selected_columns = columns; | |
| 301 | |
| 302 memset(&sz_sum, 0, sizeof(sz_sum)); | |
| 303 for (int c=0; c<KlassSizeStats::_num_columns; c++) { | |
| 304 selected[c] = is_selected(name_table[c]); | |
| 305 } | |
| 306 | |
| 307 for(i=0; i < elements()->length(); i++) { | |
| 308 elements()->at(i)->set_index(i+1); | |
| 309 } | |
| 310 | |
| 311 for (int pass=1; pass<=2; pass++) { | |
| 312 if (pass == 2) { | |
| 313 print_title(st, csv_format, selected, width_table, name_table); | |
| 314 } | |
| 315 for(i=0; i < elements()->length(); i++) { | |
| 316 KlassInfoEntry* e = (KlassInfoEntry*)elements()->at(i); | |
| 317 const Klass* k = e->klass(); | |
| 318 | |
| 319 memset(&sz, 0, sizeof(sz)); | |
| 320 sz._inst_count = e->count(); | |
| 321 sz._inst_bytes = HeapWordSize * e->words(); | |
| 322 k->collect_statistics(&sz); | |
| 323 sz._total_bytes = sz._ro_bytes + sz._rw_bytes; | |
| 324 | |
| 325 if (pass == 1) { | |
| 326 for (int c=0; c<KlassSizeStats::_num_columns; c++) { | |
| 327 colsum_table[c] += col_table[c]; | |
| 328 } | |
| 329 } else { | |
| 330 int super_index = -1; | |
| 331 if (k->oop_is_instance()) { | |
| 332 Klass* super = ((InstanceKlass*)k)->java_super(); | |
| 333 if (super) { | |
| 334 KlassInfoEntry* super_e = _cit->lookup(super); | |
| 335 if (super_e) { | |
| 336 super_index = super_e->index(); | |
| 337 } | |
| 338 } | |
| 339 } | |
| 340 | |
| 341 if (csv_format) { | |
| 342 st->print("%d,%d", e->index(), super_index); | |
| 343 for (int c=0; c<KlassSizeStats::_num_columns; c++) { | |
| 344 if (selected[c]) {st->print("," JULONG_FORMAT, col_table[c]);} | |
| 345 } | |
| 346 st->print(",%s",e->name()); | |
| 347 } else { | |
| 348 st->print("%5d %5d", e->index(), super_index); | |
| 349 for (int c=0; c<KlassSizeStats::_num_columns; c++) { | |
| 350 if (selected[c]) {print_julong(st, width_table[c], col_table[c]);} | |
| 351 } | |
| 352 st->print(" %s", e->name()); | |
| 353 } | |
| 354 if (is_selected("ClassLoader")) { | |
| 355 ClassLoaderData* loader_data = k->class_loader_data(); | |
| 356 st->print(","); | |
| 357 loader_data->print_value_on(st); | |
| 358 } | |
| 359 st->cr(); | |
| 360 } | |
| 361 } | |
| 362 | |
| 363 if (pass == 1) { | |
| 364 for (int c=0; c<KlassSizeStats::_num_columns; c++) { | |
| 365 width_table[c] = col_width(colsum_table[c], name_table[c]); | |
| 366 } | |
| 367 } | |
| 368 } | |
| 369 | |
| 370 sz_sum._inst_size = 0; | |
| 371 | |
| 372 if (csv_format) { | |
| 373 st->print(","); | |
| 374 for (int c=0; c<KlassSizeStats::_num_columns; c++) { | |
| 375 if (selected[c]) {st->print("," JULONG_FORMAT, colsum_table[c]);} | |
| 376 } | |
| 377 } else { | |
| 378 st->print(" "); | |
| 379 for (int c=0; c<KlassSizeStats::_num_columns; c++) { | |
| 380 if (selected[c]) {print_julong(st, width_table[c], colsum_table[c]);} | |
| 381 } | |
| 382 st->print(" Total"); | |
| 383 if (sz_sum._total_bytes > 0) { | |
| 384 st->cr(); | |
| 385 st->print(" "); | |
| 386 for (int c=0; c<KlassSizeStats::_num_columns; c++) { | |
| 387 if (selected[c]) { | |
| 388 switch (c) { | |
| 389 case KlassSizeStats::_index_inst_size: | |
| 390 case KlassSizeStats::_index_inst_count: | |
| 391 case KlassSizeStats::_index_method_count: | |
| 392 st->print(str_fmt(width_table[c]), "-"); | |
| 393 break; | |
| 394 default: | |
| 395 { | |
| 396 double perc = (double)(100) * (double)(colsum_table[c]) / (double)sz_sum._total_bytes; | |
| 397 st->print(perc_fmt(width_table[c]), perc); | |
| 398 } | |
| 399 } | |
| 400 } | |
| 401 } | |
| 402 } | |
| 403 } | |
| 404 st->cr(); | |
| 405 | |
| 406 if (!csv_format) { | |
| 407 print_title(st, csv_format, selected, width_table, name_table); | |
| 408 } | |
| 409 } | |
| 410 | |
| 411 julong KlassInfoHisto::annotations_bytes(Array<AnnotationArray*>* p) const { | |
| 412 julong bytes = 0; | |
| 413 if (p != NULL) { | |
| 414 for (int i = 0; i < p->length(); i++) { | |
| 415 bytes += count_bytes_array(p->at(i)); | |
| 416 } | |
| 417 bytes += count_bytes_array(p); | |
| 418 } | |
| 419 return bytes; | |
| 420 } | |
| 421 | |
| 422 void KlassInfoHisto::print_histo_on(outputStream* st, bool print_stats, | |
| 423 bool csv_format, const char *columns) { | |
| 424 if (print_stats) { | |
| 425 print_class_stats(st, csv_format, columns); | |
| 426 } else { | |
| 427 st->print_cr("%s",title()); | |
| 428 print_elements(st); | |
| 429 } | |
| 0 | 430 } |
| 431 | |
| 432 class HistoClosure : public KlassInfoClosure { | |
| 433 private: | |
| 434 KlassInfoHisto* _cih; | |
| 435 public: | |
| 436 HistoClosure(KlassInfoHisto* cih) : _cih(cih) {} | |
| 437 | |
| 438 void do_cinfo(KlassInfoEntry* cie) { | |
| 439 _cih->add(cie); | |
| 440 } | |
| 441 }; | |
| 442 | |
| 443 class RecordInstanceClosure : public ObjectClosure { | |
| 444 private: | |
| 445 KlassInfoTable* _cit; | |
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446 size_t _missed_count; |
| 0 | 447 public: |
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448 RecordInstanceClosure(KlassInfoTable* cit) : |
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449 _cit(cit), _missed_count(0) {} |
| 0 | 450 |
| 451 void do_object(oop obj) { | |
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452 if (!_cit->record_instance(obj)) { |
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453 _missed_count++; |
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454 } |
| 0 | 455 } |
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456 |
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457 size_t missed_count() { return _missed_count; } |
| 0 | 458 }; |
| 459 | |
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460 void HeapInspection::heap_inspection(outputStream* st, bool need_prologue) { |
| 0 | 461 ResourceMark rm; |
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462 // Get some random number for ref (the hash key) |
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463 HeapWord* ref = (HeapWord*) Universe::boolArrayKlassObj(); |
| 0 | 464 CollectedHeap* heap = Universe::heap(); |
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465 bool is_shared_heap = false; |
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466 |
| 7956 | 467 if (_print_help) { |
| 468 for (int c=0; c<KlassSizeStats::_num_columns; c++) { | |
| 469 st->print("%s:\n\t", name_table[c]); | |
| 470 const int max_col = 60; | |
| 471 int col = 0; | |
| 472 for (const char *p = help_table[c]; *p; p++,col++) { | |
| 473 if (col >= max_col && *p == ' ') { | |
| 474 st->print("\n\t"); | |
| 475 col = 0; | |
| 476 } else { | |
| 477 st->print("%c", *p); | |
| 478 } | |
| 479 } | |
| 480 st->print_cr(".\n"); | |
| 481 } | |
| 482 return; | |
| 483 } | |
| 484 | |
| 0 | 485 // Collect klass instance info |
| 7956 | 486 KlassInfoTable cit(KlassInfoTable::cit_size, ref, _print_class_stats); |
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487 if (!cit.allocation_failed()) { |
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488 // Iterate over objects in the heap |
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489 RecordInstanceClosure ric(&cit); |
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490 Universe::heap()->object_iterate(&ric); |
| 0 | 491 |
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492 // Report if certain classes are not counted because of |
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493 // running out of C-heap for the histogram. |
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494 size_t missed_count = ric.missed_count(); |
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495 if (missed_count != 0) { |
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496 st->print_cr("WARNING: Ran out of C-heap; undercounted " SIZE_FORMAT |
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497 " total instances in data below", |
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498 missed_count); |
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499 } |
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500 // Sort and print klass instance info |
| 7956 | 501 const char *title = "\n" |
| 502 " num #instances #bytes class name\n" | |
| 503 "----------------------------------------------"; | |
| 504 KlassInfoHisto histo(&cit, title, KlassInfoHisto::histo_initial_size); | |
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505 HistoClosure hc(&histo); |
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506 cit.iterate(&hc); |
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507 histo.sort(); |
| 7956 | 508 histo.print_histo_on(st, _print_class_stats, _csv_format, _columns); |
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509 } else { |
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510 st->print_cr("WARNING: Ran out of C-heap; histogram not generated"); |
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511 } |
| 0 | 512 st->flush(); |
| 513 | |
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514 if (need_prologue && is_shared_heap) { |
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515 SharedHeap* sh = (SharedHeap*)heap; |
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516 sh->gc_epilogue(false /* !full */); // release all acquired locks, etc. |
| 0 | 517 } |
| 518 } | |
| 519 | |
| 520 class FindInstanceClosure : public ObjectClosure { | |
| 521 private: | |
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522 Klass* _klass; |
| 0 | 523 GrowableArray<oop>* _result; |
| 524 | |
| 525 public: | |
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526 FindInstanceClosure(Klass* k, GrowableArray<oop>* result) : _klass(k), _result(result) {}; |
| 0 | 527 |
| 528 void do_object(oop obj) { | |
| 529 if (obj->is_a(_klass)) { | |
| 530 _result->append(obj); | |
| 531 } | |
| 532 } | |
| 533 }; | |
| 534 | |
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535 void HeapInspection::find_instances_at_safepoint(Klass* k, GrowableArray<oop>* result) { |
| 0 | 536 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); |
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537 assert(Heap_lock->is_locked(), "should have the Heap_lock"); |
| 0 | 538 |
| 539 // Ensure that the heap is parsable | |
| 540 Universe::heap()->ensure_parsability(false); // no need to retire TALBs | |
| 541 | |
| 542 // Iterate over objects in the heap | |
| 543 FindInstanceClosure fic(k, result); | |
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544 // If this operation encounters a bad object when using CMS, |
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545 // consider using safe_object_iterate() which avoids metadata |
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546 // objects that may contain bad references. |
| 0 | 547 Universe::heap()->object_iterate(&fic); |
| 548 } |