1 /*
2 * Copyright (c) 2002, 2018, 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.inline.hpp"
27 #include "classfile/classLoaderDataGraph.hpp"
28 #include "classfile/moduleEntry.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "gc/shared/collectedHeap.hpp"
31 #include "memory/heapInspection.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "memory/universe.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "oops/reflectionAccessorImplKlassHelper.hpp"
36 #include "oops/valueKlass.hpp"
37 #include "runtime/os.hpp"
38 #include "runtime/fieldDescriptor.inline.hpp"
39 #include "utilities/globalDefinitions.hpp"
40 #include "utilities/macros.hpp"
41 #include "utilities/stack.inline.hpp"
42
43 // HeapInspection
44
45 int KlassSizeStats::count(oop x) {
46 return (HeapWordSize * (((x) != NULL) ? (x)->size() : 0));
47 }
48
49 int KlassSizeStats::count_array(objArrayOop x) {
50 return (HeapWordSize * (((x) != NULL) ? (x)->size() : 0));
51 }
52
53 inline KlassInfoEntry::~KlassInfoEntry() {
54 if (_subclasses != NULL) {
55 delete _subclasses;
56 }
57 }
58
59 inline void KlassInfoEntry::add_subclass(KlassInfoEntry* cie) {
60 if (_subclasses == NULL) {
61 _subclasses = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<KlassInfoEntry*>(4, true);
62 }
63 _subclasses->append(cie);
64 }
65
66 int KlassInfoEntry::compare(KlassInfoEntry* e1, KlassInfoEntry* e2) {
67 if(e1->_instance_words > e2->_instance_words) {
68 return -1;
69 } else if(e1->_instance_words < e2->_instance_words) {
70 return 1;
71 }
72 // Sort alphabetically, note 'Z' < '[' < 'a', but it's better to group
73 // the array classes before all the instance classes.
74 ResourceMark rm;
75 const char* name1 = e1->klass()->external_name();
76 const char* name2 = e2->klass()->external_name();
77 bool d1 = (name1[0] == '[');
78 bool d2 = (name2[0] == '[');
79 if (d1 && !d2) {
80 return -1;
81 } else if (d2 && !d1) {
82 return 1;
83 } else {
84 return strcmp(name1, name2);
85 }
86 }
87
88 const char* KlassInfoEntry::name() const {
89 const char* name;
90 if (_klass->name() != NULL) {
91 name = _klass->external_name();
92 } else {
93 if (_klass == Universe::boolArrayKlassObj()) name = "<boolArrayKlass>"; else
94 if (_klass == Universe::charArrayKlassObj()) name = "<charArrayKlass>"; else
95 if (_klass == Universe::floatArrayKlassObj()) name = "<floatArrayKlass>"; else
96 if (_klass == Universe::doubleArrayKlassObj()) name = "<doubleArrayKlass>"; else
97 if (_klass == Universe::byteArrayKlassObj()) name = "<byteArrayKlass>"; else
98 if (_klass == Universe::shortArrayKlassObj()) name = "<shortArrayKlass>"; else
99 if (_klass == Universe::intArrayKlassObj()) name = "<intArrayKlass>"; else
100 if (_klass == Universe::longArrayKlassObj()) name = "<longArrayKlass>"; else
101 name = "<no name>";
102 }
103 return name;
104 }
105
106 void KlassInfoEntry::print_on(outputStream* st) const {
107 ResourceMark rm;
108
109 // simplify the formatting (ILP32 vs LP64) - always cast the numbers to 64-bit
110 ModuleEntry* module = _klass->module();
111 if (module->is_named()) {
112 st->print_cr(INT64_FORMAT_W(13) " " UINT64_FORMAT_W(13) " %s (%s@%s)",
113 (int64_t)_instance_count,
114 (uint64_t)_instance_words * HeapWordSize,
115 name(),
116 module->name()->as_C_string(),
117 module->version() != NULL ? module->version()->as_C_string() : "");
118 } else {
119 st->print_cr(INT64_FORMAT_W(13) " " UINT64_FORMAT_W(13) " %s",
120 (int64_t)_instance_count,
121 (uint64_t)_instance_words * HeapWordSize,
122 name());
123 }
124 }
125
126 KlassInfoEntry* KlassInfoBucket::lookup(Klass* const k) {
127 // Can happen if k is an archived class that we haven't loaded yet.
128 if (k->java_mirror() == NULL) {
129 return NULL;
130 }
131
132 KlassInfoEntry* elt = _list;
133 while (elt != NULL) {
134 if (elt->is_equal(k)) {
135 return elt;
136 }
137 elt = elt->next();
138 }
139 elt = new (std::nothrow) KlassInfoEntry(k, list());
140 // We may be out of space to allocate the new entry.
141 if (elt != NULL) {
142 set_list(elt);
143 }
144 return elt;
145 }
146
147 void KlassInfoBucket::iterate(KlassInfoClosure* cic) {
148 KlassInfoEntry* elt = _list;
149 while (elt != NULL) {
150 cic->do_cinfo(elt);
151 elt = elt->next();
152 }
153 }
154
155 void KlassInfoBucket::empty() {
156 KlassInfoEntry* elt = _list;
157 _list = NULL;
158 while (elt != NULL) {
159 KlassInfoEntry* next = elt->next();
160 delete elt;
161 elt = next;
162 }
163 }
164
165 class KlassInfoTable::AllClassesFinder : public LockedClassesDo {
166 KlassInfoTable *_table;
167 public:
168 AllClassesFinder(KlassInfoTable* table) : _table(table) {}
169 virtual void do_klass(Klass* k) {
170 // This has the SIDE EFFECT of creating a KlassInfoEntry
171 // for <k>, if one doesn't exist yet.
172 _table->lookup(k);
173 }
174 };
175
176
177 KlassInfoTable::KlassInfoTable(bool add_all_classes) {
178 _size_of_instances_in_words = 0;
179 _ref = (HeapWord*) Universe::boolArrayKlassObj();
180 _buckets =
181 (KlassInfoBucket*) AllocateHeap(sizeof(KlassInfoBucket) * _num_buckets,
182 mtInternal, CURRENT_PC, AllocFailStrategy::RETURN_NULL);
183 if (_buckets != NULL) {
184 for (int index = 0; index < _num_buckets; index++) {
185 _buckets[index].initialize();
186 }
187 if (add_all_classes) {
188 AllClassesFinder finder(this);
189 ClassLoaderDataGraph::classes_do(&finder);
190 }
191 }
192 }
193
194 KlassInfoTable::~KlassInfoTable() {
195 if (_buckets != NULL) {
196 for (int index = 0; index < _num_buckets; index++) {
197 _buckets[index].empty();
198 }
199 FREE_C_HEAP_ARRAY(KlassInfoBucket, _buckets);
200 _buckets = NULL;
201 }
202 }
203
204 uint KlassInfoTable::hash(const Klass* p) {
205 return (uint)(((uintptr_t)p - (uintptr_t)_ref) >> 2);
206 }
207
208 KlassInfoEntry* KlassInfoTable::lookup(Klass* k) {
209 uint idx = hash(k) % _num_buckets;
210 assert(_buckets != NULL, "Allocation failure should have been caught");
211 KlassInfoEntry* e = _buckets[idx].lookup(k);
212 // Lookup may fail if this is a new klass for which we
213 // could not allocate space for an new entry, or if it's
214 // an archived class that we haven't loaded yet.
215 assert(e == NULL || k == e->klass(), "must be equal");
216 return e;
217 }
218
219 // Return false if the entry could not be recorded on account
220 // of running out of space required to create a new entry.
221 bool KlassInfoTable::record_instance(const oop obj) {
222 Klass* k = obj->klass();
223 KlassInfoEntry* elt = lookup(k);
224 // elt may be NULL if it's a new klass for which we
225 // could not allocate space for a new entry in the hashtable.
226 if (elt != NULL) {
227 elt->set_count(elt->count() + 1);
228 elt->set_words(elt->words() + obj->size());
229 _size_of_instances_in_words += obj->size();
230 return true;
231 } else {
232 return false;
233 }
234 }
235
236 void KlassInfoTable::iterate(KlassInfoClosure* cic) {
237 assert(_buckets != NULL, "Allocation failure should have been caught");
238 for (int index = 0; index < _num_buckets; index++) {
239 _buckets[index].iterate(cic);
240 }
241 }
242
243 size_t KlassInfoTable::size_of_instances_in_words() const {
244 return _size_of_instances_in_words;
245 }
246
247 int KlassInfoHisto::sort_helper(KlassInfoEntry** e1, KlassInfoEntry** e2) {
248 return (*e1)->compare(*e1,*e2);
249 }
250
251 KlassInfoHisto::KlassInfoHisto(KlassInfoTable* cit) :
252 _cit(cit) {
253 _elements = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<KlassInfoEntry*>(_histo_initial_size, true);
254 }
255
256 KlassInfoHisto::~KlassInfoHisto() {
257 delete _elements;
258 }
259
260 void KlassInfoHisto::add(KlassInfoEntry* cie) {
261 elements()->append(cie);
262 }
263
264 void KlassInfoHisto::sort() {
265 elements()->sort(KlassInfoHisto::sort_helper);
266 }
267
268 void KlassInfoHisto::print_elements(outputStream* st) const {
269 // simplify the formatting (ILP32 vs LP64) - store the sum in 64-bit
270 int64_t total = 0;
271 uint64_t totalw = 0;
272 for(int i=0; i < elements()->length(); i++) {
273 st->print("%4d: ", i+1);
274 elements()->at(i)->print_on(st);
275 total += elements()->at(i)->count();
276 totalw += elements()->at(i)->words();
277 }
278 st->print_cr("Total " INT64_FORMAT_W(13) " " UINT64_FORMAT_W(13),
279 total, totalw * HeapWordSize);
280 }
281
282 #define MAKE_COL_NAME(field, name, help) #name,
283 #define MAKE_COL_HELP(field, name, help) help,
284
285 static const char *name_table[] = {
286 HEAP_INSPECTION_COLUMNS_DO(MAKE_COL_NAME)
287 };
288
289 static const char *help_table[] = {
290 HEAP_INSPECTION_COLUMNS_DO(MAKE_COL_HELP)
291 };
292
293 bool KlassInfoHisto::is_selected(const char *col_name) {
294 if (_selected_columns == NULL) {
295 return true;
296 }
297 if (strcmp(_selected_columns, col_name) == 0) {
298 return true;
299 }
300
301 const char *start = strstr(_selected_columns, col_name);
302 if (start == NULL) {
303 return false;
304 }
305
306 // The following must be true, because _selected_columns != col_name
307 if (start > _selected_columns && start[-1] != ',') {
308 return false;
309 }
310 char x = start[strlen(col_name)];
311 if (x != ',' && x != '\0') {
312 return false;
313 }
314
315 return true;
316 }
317
318 void KlassInfoHisto::print_title(outputStream* st, bool csv_format,
319 bool selected[], int width_table[],
320 const char *name_table[]) {
321 if (csv_format) {
322 st->print("Index,Super");
323 for (int c=0; c<KlassSizeStats::_num_columns; c++) {
324 if (selected[c]) {st->print(",%s", name_table[c]);}
325 }
326 st->print(",ClassName");
327 } else {
328 st->print("Index Super");
329 for (int c = 0; c < KlassSizeStats::_num_columns; c++) {
330 if (selected[c]) {
331 st->print("%*s", width_table[c], name_table[c]);
332 }
333 }
334 st->print(" ClassName");
335 }
336
337 if (is_selected("ClassLoader")) {
338 st->print(",ClassLoader");
339 }
340 st->cr();
341 }
342
343 class HierarchyClosure : public KlassInfoClosure {
344 private:
345 GrowableArray<KlassInfoEntry*> *_elements;
346 public:
347 HierarchyClosure(GrowableArray<KlassInfoEntry*> *_elements) : _elements(_elements) {}
348
349 void do_cinfo(KlassInfoEntry* cie) {
350 // ignore array classes
351 if (cie->klass()->is_instance_klass()) {
352 _elements->append(cie);
353 }
354 }
355 };
356
357 void KlassHierarchy::print_class_hierarchy(outputStream* st, bool print_interfaces,
358 bool print_subclasses, char* classname) {
359 ResourceMark rm;
360 Stack <KlassInfoEntry*, mtClass> class_stack;
361 GrowableArray<KlassInfoEntry*> elements;
362
363 // Add all classes to the KlassInfoTable, which allows for quick lookup.
364 // A KlassInfoEntry will be created for each class.
365 KlassInfoTable cit(true);
366 if (cit.allocation_failed()) {
367 st->print_cr("ERROR: Ran out of C-heap; hierarchy not generated");
368 return;
369 }
370
371 // Add all created KlassInfoEntry instances to the elements array for easy
372 // iteration, and to allow each KlassInfoEntry instance to have a unique index.
373 HierarchyClosure hc(&elements);
374 cit.iterate(&hc);
375
376 for(int i = 0; i < elements.length(); i++) {
377 KlassInfoEntry* cie = elements.at(i);
378 Klass* super = cie->klass()->super();
379
380 // Set the index for the class.
381 cie->set_index(i + 1);
382
383 // Add the class to the subclass array of its superclass.
384 if (super != NULL) {
385 KlassInfoEntry* super_cie = cit.lookup(super);
386 assert(super_cie != NULL, "could not lookup superclass");
387 super_cie->add_subclass(cie);
388 }
389 }
390
391 // Set the do_print flag for each class that should be printed.
392 for(int i = 0; i < elements.length(); i++) {
393 KlassInfoEntry* cie = elements.at(i);
394 if (classname == NULL) {
395 // We are printing all classes.
396 cie->set_do_print(true);
397 } else {
398 // We are only printing the hierarchy of a specific class.
399 if (strcmp(classname, cie->klass()->external_name()) == 0) {
400 KlassHierarchy::set_do_print_for_class_hierarchy(cie, &cit, print_subclasses);
401 }
402 }
403 }
404
405 // Now we do a depth first traversal of the class hierachry. The class_stack will
406 // maintain the list of classes we still need to process. Start things off
407 // by priming it with java.lang.Object.
408 KlassInfoEntry* jlo_cie = cit.lookup(SystemDictionary::Object_klass());
409 assert(jlo_cie != NULL, "could not lookup java.lang.Object");
410 class_stack.push(jlo_cie);
411
412 // Repeatedly pop the top item off the stack, print its class info,
413 // and push all of its subclasses on to the stack. Do this until there
414 // are no classes left on the stack.
415 while (!class_stack.is_empty()) {
416 KlassInfoEntry* curr_cie = class_stack.pop();
417 if (curr_cie->do_print()) {
418 print_class(st, curr_cie, print_interfaces);
419 if (curr_cie->subclasses() != NULL) {
420 // Current class has subclasses, so push all of them onto the stack.
421 for (int i = 0; i < curr_cie->subclasses()->length(); i++) {
422 KlassInfoEntry* cie = curr_cie->subclasses()->at(i);
423 if (cie->do_print()) {
424 class_stack.push(cie);
425 }
426 }
427 }
428 }
429 }
430
431 st->flush();
432 }
433
434 // Sets the do_print flag for every superclass and subclass of the specified class.
435 void KlassHierarchy::set_do_print_for_class_hierarchy(KlassInfoEntry* cie, KlassInfoTable* cit,
436 bool print_subclasses) {
437 // Set do_print for all superclasses of this class.
438 Klass* super = ((InstanceKlass*)cie->klass())->java_super();
439 while (super != NULL) {
440 KlassInfoEntry* super_cie = cit->lookup(super);
441 super_cie->set_do_print(true);
442 super = super->super();
443 }
444
445 // Set do_print for this class and all of its subclasses.
446 Stack <KlassInfoEntry*, mtClass> class_stack;
447 class_stack.push(cie);
448 while (!class_stack.is_empty()) {
449 KlassInfoEntry* curr_cie = class_stack.pop();
450 curr_cie->set_do_print(true);
451 if (print_subclasses && curr_cie->subclasses() != NULL) {
452 // Current class has subclasses, so push all of them onto the stack.
453 for (int i = 0; i < curr_cie->subclasses()->length(); i++) {
454 KlassInfoEntry* cie = curr_cie->subclasses()->at(i);
455 class_stack.push(cie);
456 }
457 }
458 }
459 }
460
461 static void print_indent(outputStream* st, int indent) {
462 while (indent != 0) {
463 st->print("|");
464 indent--;
465 if (indent != 0) {
466 st->print(" ");
467 }
468 }
469 }
470
471 // Print the class name and its unique ClassLoader identifer.
472 static void print_classname(outputStream* st, Klass* klass) {
473 oop loader_oop = klass->class_loader_data()->class_loader();
474 st->print("%s/", klass->external_name());
475 if (loader_oop == NULL) {
476 st->print("null");
477 } else {
478 st->print(INTPTR_FORMAT, p2i(klass->class_loader_data()));
479 }
480 }
481
482 static void print_interface(outputStream* st, InstanceKlass* intf_klass, const char* intf_type, int indent) {
483 print_indent(st, indent);
484 st->print(" implements ");
485 print_classname(st, intf_klass);
486 st->print(" (%s intf)\n", intf_type);
487 }
488
489 void KlassHierarchy::print_class(outputStream* st, KlassInfoEntry* cie, bool print_interfaces) {
490 ResourceMark rm;
491 InstanceKlass* klass = (InstanceKlass*)cie->klass();
492 int indent = 0;
493
494 // Print indentation with proper indicators of superclass.
495 Klass* super = klass->super();
496 while (super != NULL) {
497 super = super->super();
498 indent++;
499 }
500 print_indent(st, indent);
501 if (indent != 0) st->print("--");
502
503 // Print the class name, its unique ClassLoader identifer, and if it is an interface.
504 print_classname(st, klass);
505 if (klass->is_interface()) {
506 st->print(" (intf)");
507 }
508 // Special treatment for generated core reflection accessor classes: print invocation target.
509 if (ReflectionAccessorImplKlassHelper::is_generated_accessor(klass)) {
510 st->print(" (invokes: ");
511 ReflectionAccessorImplKlassHelper::print_invocation_target(st, klass);
512 st->print(")");
513 }
514 st->print("\n");
515
516 // Print any interfaces the class has.
517 if (print_interfaces) {
518 Array<InstanceKlass*>* local_intfs = klass->local_interfaces();
519 Array<InstanceKlass*>* trans_intfs = klass->transitive_interfaces();
520 for (int i = 0; i < local_intfs->length(); i++) {
521 print_interface(st, local_intfs->at(i), "declared", indent);
522 }
523 for (int i = 0; i < trans_intfs->length(); i++) {
524 InstanceKlass* trans_interface = trans_intfs->at(i);
525 // Only print transitive interfaces if they are not also declared.
526 if (!local_intfs->contains(trans_interface)) {
527 print_interface(st, trans_interface, "inherited", indent);
528 }
529 }
530 }
531 }
532
533 void KlassInfoHisto::print_class_stats(outputStream* st,
534 bool csv_format, const char *columns) {
535 ResourceMark rm;
536 KlassSizeStats sz, sz_sum;
537 int i;
538 julong *col_table = (julong*)(&sz);
539 julong *colsum_table = (julong*)(&sz_sum);
540 int width_table[KlassSizeStats::_num_columns];
541 bool selected[KlassSizeStats::_num_columns];
542
543 _selected_columns = columns;
544
545 memset(&sz_sum, 0, sizeof(sz_sum));
546 for (int c=0; c<KlassSizeStats::_num_columns; c++) {
547 selected[c] = is_selected(name_table[c]);
548 }
549
550 for(i=0; i < elements()->length(); i++) {
551 elements()->at(i)->set_index(i+1);
552 }
553
554 // First iteration is for accumulating stats totals in colsum_table[].
555 // Second iteration is for printing stats for each class.
556 for (int pass=1; pass<=2; pass++) {
557 if (pass == 2) {
558 print_title(st, csv_format, selected, width_table, name_table);
559 }
560 for(i=0; i < elements()->length(); i++) {
561 KlassInfoEntry* e = (KlassInfoEntry*)elements()->at(i);
562 const Klass* k = e->klass();
563
564 // Get the stats for this class.
565 memset(&sz, 0, sizeof(sz));
566 sz._inst_count = e->count();
567 sz._inst_bytes = HeapWordSize * e->words();
568 k->collect_statistics(&sz);
569 sz._total_bytes = sz._ro_bytes + sz._rw_bytes;
570
571 if (pass == 1) {
572 // Add the stats for this class to the overall totals.
573 for (int c=0; c<KlassSizeStats::_num_columns; c++) {
574 colsum_table[c] += col_table[c];
575 }
576 } else {
577 int super_index = -1;
578 // Print the stats for this class.
579 if (k->is_instance_klass()) {
580 Klass* super = k->super();
581 if (super) {
582 KlassInfoEntry* super_e = _cit->lookup(super);
583 if (super_e) {
584 super_index = super_e->index();
585 }
586 }
587 }
588
589 if (csv_format) {
590 st->print("%ld,%d", e->index(), super_index);
591 for (int c=0; c<KlassSizeStats::_num_columns; c++) {
592 if (selected[c]) {st->print("," JULONG_FORMAT, col_table[c]);}
593 }
594 st->print(",%s",e->name());
595 } else {
596 st->print("%5ld %5d", e->index(), super_index);
597 for (int c=0; c<KlassSizeStats::_num_columns; c++) {
598 if (selected[c]) {print_julong(st, width_table[c], col_table[c]);}
599 }
600 st->print(" %s", e->name());
601 }
602 if (is_selected("ClassLoader")) {
603 ClassLoaderData* loader_data = k->class_loader_data();
604 st->print(",");
605 loader_data->print_value_on(st);
606 }
607 st->cr();
608 }
609 }
610
611 if (pass == 1) {
612 // Calculate the minimum width needed for the column by accounting for the
613 // column header width and the width of the largest value in the column.
614 for (int c=0; c<KlassSizeStats::_num_columns; c++) {
615 width_table[c] = col_width(colsum_table[c], name_table[c]);
616 }
617 }
618 }
619
620 sz_sum._inst_size = 0;
621
622 // Print the column totals.
623 if (csv_format) {
624 st->print(",");
625 for (int c=0; c<KlassSizeStats::_num_columns; c++) {
626 if (selected[c]) {st->print("," JULONG_FORMAT, colsum_table[c]);}
627 }
628 } else {
629 st->print(" ");
630 for (int c=0; c<KlassSizeStats::_num_columns; c++) {
631 if (selected[c]) {print_julong(st, width_table[c], colsum_table[c]);}
632 }
633 st->print(" Total");
634 if (sz_sum._total_bytes > 0) {
635 st->cr();
636 st->print(" ");
637 for (int c=0; c<KlassSizeStats::_num_columns; c++) {
638 if (selected[c]) {
639 switch (c) {
640 case KlassSizeStats::_index_inst_size:
641 case KlassSizeStats::_index_inst_count:
642 case KlassSizeStats::_index_method_count:
643 st->print("%*s", width_table[c], "-");
644 break;
645 default:
646 {
647 double perc = (double)(100) * (double)(colsum_table[c]) / (double)sz_sum._total_bytes;
648 st->print("%*.1f%%", width_table[c]-1, perc);
649 }
650 }
651 }
652 }
653 }
654 }
655 st->cr();
656
657 if (!csv_format) {
658 print_title(st, csv_format, selected, width_table, name_table);
659 }
660 }
661
662 julong KlassInfoHisto::annotations_bytes(Array<AnnotationArray*>* p) const {
663 julong bytes = 0;
664 if (p != NULL) {
665 for (int i = 0; i < p->length(); i++) {
666 bytes += count_bytes_array(p->at(i));
667 }
668 bytes += count_bytes_array(p);
669 }
670 return bytes;
671 }
672
673 void KlassInfoHisto::print_histo_on(outputStream* st, bool print_stats,
674 bool csv_format, const char *columns) {
675 if (print_stats) {
676 print_class_stats(st, csv_format, columns);
677 } else {
678 st->print_cr(" num #instances #bytes class name (module)");
679 st->print_cr("-------------------------------------------------------");
680 print_elements(st);
681 }
682 }
683
684 class HistoClosure : public KlassInfoClosure {
685 private:
686 KlassInfoHisto* _cih;
687 public:
688 HistoClosure(KlassInfoHisto* cih) : _cih(cih) {}
689
690 void do_cinfo(KlassInfoEntry* cie) {
691 _cih->add(cie);
692 }
693 };
694
695
696 class FindClassByNameClosure : public KlassInfoClosure {
697 private:
698 GrowableArray<Klass*>* _klasses;
699 Symbol* _classname;
700 public:
701 FindClassByNameClosure(GrowableArray<Klass*>* klasses, Symbol* classname) :
702 _klasses(klasses), _classname(classname) { }
703
704 void do_cinfo(KlassInfoEntry* cie) {
705 if (cie->klass()->name() == _classname) {
706 _klasses->append(cie->klass());
707 }
708 }
709 };
710
711 class FieldDesc {
712 private:
713 Symbol* _name;
714 Symbol* _signature;
715 int _offset;
716 int _index;
717 InstanceKlass* _holder;
718 AccessFlags _access_flags;
719 public:
720 FieldDesc() {
721 _name = NULL;
722 _signature = NULL;
723 _offset = -1;
724 _index = -1;
725 _holder = NULL;
726 _access_flags = AccessFlags();
727 }
728 FieldDesc(fieldDescriptor& fd) {
729 _name = fd.name();
730 _signature = fd.signature();
731 _offset = fd.offset();
732 _index = fd.index();
733 _holder = fd.field_holder();
734 _access_flags = fd.access_flags();
735 }
736 Symbol* name() { return _name;}
737 Symbol* signature() { return _signature; }
738 int offset() { return _offset; }
739 int index() { return _index; }
740 InstanceKlass* holder() { return _holder; }
741 AccessFlags access_flags() { return _access_flags; }
742 };
743
744 static int compare_offset(FieldDesc* f1, FieldDesc* f2) {
745 return f1->offset() > f2->offset() ? 1 : -1;
746 }
747
748 static void print_field(outputStream* st, int level, int offset, FieldDesc& fd, bool flattenable, bool flattened ) {
749 char* flattened_msg = (char*)"";
750 if (flattenable) {
751 flattened_msg = flattened ? (char*)"and flattened" : (char*)"not flattened";
752 }
753 st->print_cr(" @ %d %*s \"%s\" %s %s %s",
754 offset, level * 3, "",
755 fd.name()->as_C_string(),
756 fd.signature()->as_C_string(),
757 flattenable ? " // flattenable" : "",
758 flattened_msg);
759 }
760
761 static void print_flattened_field(outputStream* st, int level, int offset, InstanceKlass* klass) {
762 assert(klass->is_value(), "Only value classes can be flattened");
763 ValueKlass* vklass = ValueKlass::cast(klass);
764 GrowableArray<FieldDesc>* fields = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<FieldDesc>(100, true);
765 for (FieldStream fd(klass, false, false); !fd.eos(); fd.next()) {
766 if (!fd.access_flags().is_static()) {
767 fields->append(FieldDesc(fd.field_descriptor()));
768 }
769 }
770 fields->sort(compare_offset);
771 for(int i = 0; i < fields->length(); i++) {
772 FieldDesc fd = fields->at(i);
773 int offset2 = offset + fd.offset() - vklass->first_field_offset();
774 print_field(st, level, offset2, fd,
775 fd.access_flags().is_flattenable(), fd.holder()->field_is_flattened(fd.index()));
776 if (fd.holder()->field_is_flattened(fd.index())) {
777 print_flattened_field(st, level + 1, offset2 ,
778 InstanceKlass::cast(fd.holder()->get_value_field_klass(fd.index())));
779 }
780 }
781 }
782
783 void PrintClassLayout::print_class_layout(outputStream* st, char* class_name) {
784 KlassInfoTable cit(true);
785 if (cit.allocation_failed()) {
786 st->print_cr("ERROR: Ran out of C-heap; hierarchy not generated");
787 return;
788 }
789
790 Thread* THREAD = Thread::current();
791
792 Symbol* classname = SymbolTable::probe(class_name, strlen(class_name));
793
794 GrowableArray<Klass*>* klasses = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Klass*>(100, true);
795
796 FindClassByNameClosure fbnc(klasses, classname);
797 cit.iterate(&fbnc);
798
799 for(int i = 0; i < klasses->length(); i++) {
800 Klass* klass = klasses->at(i);
801 if (!klass->is_instance_klass()) continue; // Skip
802 InstanceKlass* ik = InstanceKlass::cast(klass);
803 int tab = 1;
804 st->print_cr("Class %s [@%s]:", klass->name()->as_C_string(),
805 klass->class_loader_data()->name()->as_C_string());
806 ResourceMark rm;
807 GrowableArray<FieldDesc>* fields = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<FieldDesc>(100, true);
808 for (FieldStream fd(ik, false, false); !fd.eos(); fd.next()) {
809 if (!fd.access_flags().is_static()) {
810 fields->append(FieldDesc(fd.field_descriptor()));
811 }
812 }
813 fields->sort(compare_offset);
814 for(int i = 0; i < fields->length(); i++) {
815 FieldDesc fd = fields->at(i);
816 print_field(st, 0, fd.offset(), fd, fd.access_flags().is_flattenable(), fd.holder()->field_is_flattened(fd.index()));
817 if (fd.holder()->field_is_flattened(fd.index())) {
818 print_flattened_field(st, 1, fd.offset(),
819 InstanceKlass::cast(fd.holder()->get_value_field_klass(fd.index())));
820 }
821 }
822 }
823 st->cr();
824 }
825
826 class RecordInstanceClosure : public ObjectClosure {
827 private:
828 KlassInfoTable* _cit;
829 size_t _missed_count;
830 BoolObjectClosure* _filter;
831 public:
832 RecordInstanceClosure(KlassInfoTable* cit, BoolObjectClosure* filter) :
833 _cit(cit), _missed_count(0), _filter(filter) {}
834
835 void do_object(oop obj) {
836 if (should_visit(obj)) {
837 if (!_cit->record_instance(obj)) {
838 _missed_count++;
839 }
840 }
841 }
842
843 size_t missed_count() { return _missed_count; }
844
845 private:
846 bool should_visit(oop obj) {
847 return _filter == NULL || _filter->do_object_b(obj);
848 }
849 };
850
851 size_t HeapInspection::populate_table(KlassInfoTable* cit, BoolObjectClosure *filter) {
852 ResourceMark rm;
853
854 RecordInstanceClosure ric(cit, filter);
855 Universe::heap()->object_iterate(&ric);
856 return ric.missed_count();
857 }
858
859 void HeapInspection::heap_inspection(outputStream* st) {
860 ResourceMark rm;
861
862 if (_print_help) {
863 for (int c=0; c<KlassSizeStats::_num_columns; c++) {
864 st->print("%s:\n\t", name_table[c]);
865 const int max_col = 60;
866 int col = 0;
867 for (const char *p = help_table[c]; *p; p++,col++) {
868 if (col >= max_col && *p == ' ') {
869 st->print("\n\t");
870 col = 0;
871 } else {
872 st->print("%c", *p);
873 }
874 }
875 st->print_cr(".\n");
876 }
877 return;
878 }
879
880 KlassInfoTable cit(_print_class_stats);
881 if (!cit.allocation_failed()) {
882 // populate table with object allocation info
883 size_t missed_count = populate_table(&cit);
884 if (missed_count != 0) {
885 st->print_cr("WARNING: Ran out of C-heap; undercounted " SIZE_FORMAT
886 " total instances in data below",
887 missed_count);
888 }
889
890 // Sort and print klass instance info
891 KlassInfoHisto histo(&cit);
892 HistoClosure hc(&histo);
893
894 cit.iterate(&hc);
895
896 histo.sort();
897 histo.print_histo_on(st, _print_class_stats, _csv_format, _columns);
898 } else {
899 st->print_cr("ERROR: Ran out of C-heap; histogram not generated");
900 }
901 st->flush();
902 }
903
904 class FindInstanceClosure : public ObjectClosure {
905 private:
906 Klass* _klass;
907 GrowableArray<oop>* _result;
908
909 public:
910 FindInstanceClosure(Klass* k, GrowableArray<oop>* result) : _klass(k), _result(result) {};
911
912 void do_object(oop obj) {
913 if (obj->is_a(_klass)) {
914 _result->append(obj);
915 }
916 }
917 };
918
919 void HeapInspection::find_instances_at_safepoint(Klass* k, GrowableArray<oop>* result) {
920 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped");
921 assert(Heap_lock->is_locked(), "should have the Heap_lock");
922
923 // Ensure that the heap is parsable
924 Universe::heap()->ensure_parsability(false); // no need to retire TALBs
925
926 // Iterate over objects in the heap
927 FindInstanceClosure fic(k, result);
928 // If this operation encounters a bad object when using CMS,
929 // consider using safe_object_iterate() which avoids metadata
930 // objects that may contain bad references.
931 Universe::heap()->object_iterate(&fic);
932 }