Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "classfile/classLoaderData.hpp"

 #include "gc_interface/collectedHeap.hpp"

 #include "memory/genCollectedHeap.hpp"

 #include "memory/heapInspection.hpp"

 #include "memory/resourceArea.hpp"

 #include "runtime/os.hpp"

 #include "utilities/globalDefinitions.hpp"

 #include "utilities/macros.hpp"

 #if INCLUDE_ALL_GCS

 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"

 #endif // INCLUDE_ALL_GCS

 // HeapInspection

 int KlassInfoEntry::compare(KlassInfoEntry* e1, KlassInfoEntry* e2) {

   if(e1->_instance_words > e2->_instance_words) {

     return -1;

   } else if(e1->_instance_words < e2->_instance_words) {

     return 1;

   }

   // Sort alphabetically, note 'Z' < '[' < 'a', but it's better to group

   // the array classes before all the instance classes.

   ResourceMark rm;

   const char* name1 = e1->klass()->external_name();

   const char* name2 = e2->klass()->external_name();

   bool d1 = (name1[0] == '[');

   bool d2 = (name2[0] == '[');

   if (d1 && !d2) {

     return -1;

   } else if (d2 && !d1) {

     return 1;

   } else {

     return strcmp(name1, name2);

   }

 }

 const char* KlassInfoEntry::name() const {

   const char* name;

   if (_klass->name() != NULL) {

     name = _klass->external_name();

   } else {

     if (_klass == Universe::boolArrayKlassObj())         name = "<boolArrayKlass>";         else

     if (_klass == Universe::charArrayKlassObj())         name = "<charArrayKlass>";         else

     if (_klass == Universe::singleArrayKlassObj())       name = "<singleArrayKlass>";       else

     if (_klass == Universe::doubleArrayKlassObj())       name = "<doubleArrayKlass>";       else

     if (_klass == Universe::byteArrayKlassObj())         name = "<byteArrayKlass>";         else

     if (_klass == Universe::shortArrayKlassObj())        name = "<shortArrayKlass>";        else

     if (_klass == Universe::intArrayKlassObj())          name = "<intArrayKlass>";          else

     if (_klass == Universe::longArrayKlassObj())         name = "<longArrayKlass>";         else

       name = "<no name>";

   }

   return name;

 }

 void KlassInfoEntry::print_on(outputStream* st) const {

   ResourceMark rm;

   // simplify the formatting (ILP32 vs LP64) - always cast the numbers to 64-bit

   st->print_cr(INT64_FORMAT_W(13) "  " UINT64_FORMAT_W(13) "  %s",

                (jlong)  _instance_count,

                (julong) _instance_words * HeapWordSize,

                name());

 }

 KlassInfoEntry* KlassInfoBucket::lookup(Klass* const k) {

   KlassInfoEntry* elt = _list;

   while (elt != NULL) {

     if (elt->is_equal(k)) {

       return elt;

     }

     elt = elt->next();

   }

   elt = new (std::nothrow) KlassInfoEntry(k, list());

   // We may be out of space to allocate the new entry.

   if (elt != NULL) {

     set_list(elt);

   }

   return elt;

 }

 void KlassInfoBucket::iterate(KlassInfoClosure* cic) {

   KlassInfoEntry* elt = _list;

   while (elt != NULL) {

     cic->do_cinfo(elt);

     elt = elt->next();

   }

 }

 void KlassInfoBucket::empty() {

   KlassInfoEntry* elt = _list;

   _list = NULL;

   while (elt != NULL) {

     KlassInfoEntry* next = elt->next();

     delete elt;

     elt = next;

   }

 }

 void KlassInfoTable::AllClassesFinder::do_klass(Klass* k) {

   // This has the SIDE EFFECT of creating a KlassInfoEntry

   // for <k>, if one doesn't exist yet.

   _table->lookup(k);

 }

 KlassInfoTable::KlassInfoTable(bool need_class_stats) {

   _size_of_instances_in_words = 0;

   _size = 0;

   _ref = (HeapWord*) Universe::boolArrayKlassObj();

   _buckets =

     (KlassInfoBucket*)  AllocateHeap(sizeof(KlassInfoBucket) * _num_buckets,

                                             mtInternal, 0, AllocFailStrategy::RETURN_NULL);

   if (_buckets != NULL) {

     _size = _num_buckets;

     for (int index = 0; index < _size; index++) {

       _buckets[index].initialize();

     }

     if (need_class_stats) {

       AllClassesFinder finder(this);

       ClassLoaderDataGraph::classes_do(&finder);

     }

   }

 }

 KlassInfoTable::~KlassInfoTable() {

   if (_buckets != NULL) {

     for (int index = 0; index < _size; index++) {

       _buckets[index].empty();

     }

     FREE_C_HEAP_ARRAY(KlassInfoBucket, _buckets, mtInternal);

     _size = 0;

   }

 }

 uint KlassInfoTable::hash(const Klass* p) {

   assert(p->is_metadata(), "all klasses are metadata");

   return (uint)(((uintptr_t)p - (uintptr_t)_ref) >> 2);

 }

 KlassInfoEntry* KlassInfoTable::lookup(Klass* k) {

   uint         idx = hash(k) % _size;

   assert(_buckets != NULL, "Allocation failure should have been caught");

   KlassInfoEntry*  e   = _buckets[idx].lookup(k);

   // Lookup may fail if this is a new klass for which we

   // could not allocate space for an new entry.

   assert(e == NULL || k == e->klass(), "must be equal");

   return e;

 }

 // Return false if the entry could not be recorded on account

 // of running out of space required to create a new entry.

 bool KlassInfoTable::record_instance(const oop obj) {

   Klass*        k = obj->klass();

   KlassInfoEntry* elt = lookup(k);

   // elt may be NULL if it's a new klass for which we

   // could not allocate space for a new entry in the hashtable.

   if (elt != NULL) {

     elt->set_count(elt->count() + 1);

     elt->set_words(elt->words() + obj->size());

     _size_of_instances_in_words += obj->size();

     return true;

   } else {

     return false;

   }

 }

 void KlassInfoTable::iterate(KlassInfoClosure* cic) {

   assert(_size == 0 || _buckets != NULL, "Allocation failure should have been caught");

   for (int index = 0; index < _size; index++) {

     _buckets[index].iterate(cic);

   }

 }

 size_t KlassInfoTable::size_of_instances_in_words() const {

   return _size_of_instances_in_words;

 }

 int KlassInfoHisto::sort_helper(KlassInfoEntry** e1, KlassInfoEntry** e2) {

   return (*e1)->compare(*e1,*e2);

 }

 KlassInfoHisto::KlassInfoHisto(KlassInfoTable* cit, const char* title) :

   _cit(cit),

   _title(title) {

   _elements = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<KlassInfoEntry*>(_histo_initial_size, true);

 }

 KlassInfoHisto::~KlassInfoHisto() {

   delete _elements;

 }

 void KlassInfoHisto::add(KlassInfoEntry* cie) {

   elements()->append(cie);

 }

 void KlassInfoHisto::sort() {

   elements()->sort(KlassInfoHisto::sort_helper);

 }

 void KlassInfoHisto::print_elements(outputStream* st) const {

   // simplify the formatting (ILP32 vs LP64) - store the sum in 64-bit

   jlong total = 0;

   julong totalw = 0;

   for(int i=0; i < elements()->length(); i++) {

     st->print("%4d: ", i+1);

     elements()->at(i)->print_on(st);

     total += elements()->at(i)->count();

     totalw += elements()->at(i)->words();

   }

   st->print_cr("Total " INT64_FORMAT_W(13) "  " UINT64_FORMAT_W(13),

                total, totalw * HeapWordSize);

 }

 #define MAKE_COL_NAME(field, name, help)     #name,

 #define MAKE_COL_HELP(field, name, help)     help,

 static const char *name_table[] = {

   HEAP_INSPECTION_COLUMNS_DO(MAKE_COL_NAME)

 };

 static const char *help_table[] = {

   HEAP_INSPECTION_COLUMNS_DO(MAKE_COL_HELP)

 };

 bool KlassInfoHisto::is_selected(const char *col_name) {

   if (_selected_columns == NULL) {

     return true;

   }

   if (strcmp(_selected_columns, col_name) == 0) {

     return true;

   }

   const char *start = strstr(_selected_columns, col_name);

   if (start == NULL) {

     return false;

   }

   // The following must be true, because _selected_columns != col_name

   if (start > _selected_columns && start[-1] != ',') {

     return false;

   }

   char x = start[strlen(col_name)];

   if (x != ',' && x != '\0') {

     return false;

   }

   return true;

 }

 void KlassInfoHisto::print_title(outputStream* st, bool csv_format,

                                  bool selected[], int width_table[],

                                  const char *name_table[]) {

   if (csv_format) {

     st->print("Index,Super");

     for (int c=0; c<KlassSizeStats::_num_columns; c++) {

        if (selected[c]) {st->print(",%s", name_table[c]);}

     }

     st->print(",ClassName");

   } else {

     st->print("Index Super");

     for (int c=0; c<KlassSizeStats::_num_columns; c++) {

       if (selected[c]) {st->print(str_fmt(width_table[c]), name_table[c]);}

     }

     st->print(" ClassName");

   }

   if (is_selected("ClassLoader")) {

     st->print(",ClassLoader");

   }

   st->cr();

 }

 void KlassInfoHisto::print_class_stats(outputStream* st,

                                       bool csv_format, const char *columns) {

   ResourceMark rm;

   KlassSizeStats sz, sz_sum;

   int i;

   julong *col_table = (julong*)(&sz);

   julong *colsum_table = (julong*)(&sz_sum);

   int width_table[KlassSizeStats::_num_columns];

   bool selected[KlassSizeStats::_num_columns];

   _selected_columns = columns;

   memset(&sz_sum, 0, sizeof(sz_sum));

   for (int c=0; c<KlassSizeStats::_num_columns; c++) {

     selected[c] = is_selected(name_table[c]);

   }

   for(i=0; i < elements()->length(); i++) {

     elements()->at(i)->set_index(i+1);

   }

   for (int pass=1; pass<=2; pass++) {

     if (pass == 2) {

       print_title(st, csv_format, selected, width_table, name_table);

     }

     for(i=0; i < elements()->length(); i++) {

       KlassInfoEntry* e = (KlassInfoEntry*)elements()->at(i);

       const Klass* k = e->klass();

       memset(&sz, 0, sizeof(sz));

       sz._inst_count = e->count();

       sz._inst_bytes = HeapWordSize * e->words();

       k->collect_statistics(&sz);

       sz._total_bytes = sz._ro_bytes + sz._rw_bytes;

       if (pass == 1) {

         for (int c=0; c<KlassSizeStats::_num_columns; c++) {

           colsum_table[c] += col_table[c];

         }

       } else {

         int super_index = -1;

         if (k->oop_is_instance()) {

           Klass* super = ((InstanceKlass*)k)->java_super();

           if (super) {

             KlassInfoEntry* super_e = _cit->lookup(super);

             if (super_e) {

               super_index = super_e->index();

             }

           }

         }

         if (csv_format) {

           st->print("%d,%d", e->index(), super_index);

           for (int c=0; c<KlassSizeStats::_num_columns; c++) {

             if (selected[c]) {st->print("," JULONG_FORMAT, col_table[c]);}

           }

           st->print(",%s",e->name());

         } else {

           st->print("%5d %5d", e->index(), super_index);

           for (int c=0; c<KlassSizeStats::_num_columns; c++) {

             if (selected[c]) {print_julong(st, width_table[c], col_table[c]);}

           }

           st->print(" %s", e->name());

         }

         if (is_selected("ClassLoader")) {

           ClassLoaderData* loader_data = k->class_loader_data();

           st->print(",");

           loader_data->print_value_on(st);

         }

         st->cr();

       }

     }

     if (pass == 1) {

       for (int c=0; c<KlassSizeStats::_num_columns; c++) {

         width_table[c] = col_width(colsum_table[c], name_table[c]);

       }

     }

   }

   sz_sum._inst_size = 0;

   if (csv_format) {

     st->print(",");

     for (int c=0; c<KlassSizeStats::_num_columns; c++) {

       if (selected[c]) {st->print("," JULONG_FORMAT, colsum_table[c]);}

     }

   } else {

     st->print("           ");

     for (int c=0; c<KlassSizeStats::_num_columns; c++) {

       if (selected[c]) {print_julong(st, width_table[c], colsum_table[c]);}

     }

     st->print(" Total");

     if (sz_sum._total_bytes > 0) {

       st->cr();

       st->print("           ");

       for (int c=0; c<KlassSizeStats::_num_columns; c++) {

         if (selected[c]) {

           switch (c) {

           case KlassSizeStats::_index_inst_size:

           case KlassSizeStats::_index_inst_count:

           case KlassSizeStats::_index_method_count:

             st->print(str_fmt(width_table[c]), "-");

             break;

           default:

             {

               double perc = (double)(100) * (double)(colsum_table[c]) / (double)sz_sum._total_bytes;

               st->print(perc_fmt(width_table[c]), perc);

             }

           }

         }

       }

     }

   }

   st->cr();

   if (!csv_format) {

     print_title(st, csv_format, selected, width_table, name_table);

   }

 }

 julong KlassInfoHisto::annotations_bytes(Array<AnnotationArray*>* p) const {

   julong bytes = 0;

   if (p != NULL) {

     for (int i = 0; i < p->length(); i++) {

       bytes += count_bytes_array(p->at(i));

     }

     bytes += count_bytes_array(p);

   }

   return bytes;

 }

 void KlassInfoHisto::print_histo_on(outputStream* st, bool print_stats,

                                     bool csv_format, const char *columns) {

   if (print_stats) {

     print_class_stats(st, csv_format, columns);

   } else {

     st->print_cr("%s",title());

     print_elements(st);

   }

 }

 class HistoClosure : public KlassInfoClosure {

  private:

   KlassInfoHisto* _cih;

  public:

   HistoClosure(KlassInfoHisto* cih) : _cih(cih) {}

   void do_cinfo(KlassInfoEntry* cie) {

     _cih->add(cie);

   }

 };

 class RecordInstanceClosure : public ObjectClosure {

  private:

   KlassInfoTable* _cit;

   size_t _missed_count;

   BoolObjectClosure* _filter;

  public:

   RecordInstanceClosure(KlassInfoTable* cit, BoolObjectClosure* filter) :

     _cit(cit), _missed_count(0), _filter(filter) {}

   void do_object(oop obj) {

     if (should_visit(obj)) {

       if (!_cit->record_instance(obj)) {

         _missed_count++;

       }

     }

   }

   size_t missed_count() { return _missed_count; }

  private:

   bool should_visit(oop obj) {

     return _filter == NULL || _filter->do_object_b(obj);

   }

 };

 size_t HeapInspection::populate_table(KlassInfoTable* cit, BoolObjectClosure *filter) {

   ResourceMark rm;

   RecordInstanceClosure ric(cit, filter);

   Universe::heap()->object_iterate(&ric);

   return ric.missed_count();

 }

 void HeapInspection::heap_inspection(outputStream* st) {

   ResourceMark rm;

   if (_print_help) {

     for (int c=0; c<KlassSizeStats::_num_columns; c++) {

       st->print("%s:\n\t", name_table[c]);

       const int max_col = 60;

       int col = 0;

       for (const char *p = help_table[c]; *p; p++,col++) {

         if (col >= max_col && *p == ' ') {

           st->print("\n\t");

           col = 0;

         } else {

           st->print("%c", *p);

         }

       }

       st->print_cr(".\n");

     }

     return;

   }

   KlassInfoTable cit(_print_class_stats);

   if (!cit.allocation_failed()) {

     size_t missed_count = populate_table(&cit);

     if (missed_count != 0) {

       st->print_cr("WARNING: Ran out of C-heap; undercounted " SIZE_FORMAT

                    " total instances in data below",

                    missed_count);

     }

     // Sort and print klass instance info

     const char *title = "\n"

               " num     #instances         #bytes  class name\n"

               "----------------------------------------------";

     KlassInfoHisto histo(&cit, title);

     HistoClosure hc(&histo);

     cit.iterate(&hc);

     histo.sort();

     histo.print_histo_on(st, _print_class_stats, _csv_format, _columns);

   } else {

     st->print_cr("WARNING: Ran out of C-heap; histogram not generated");

   }

   st->flush();

 }

 class FindInstanceClosure : public ObjectClosure {

  private:

   Klass* _klass;

   GrowableArray<oop>* _result;

  public:

   FindInstanceClosure(Klass* k, GrowableArray<oop>* result) : _klass(k), _result(result) {};

   void do_object(oop obj) {

     if (obj->is_a(_klass)) {

       _result->append(obj);

     }

   }

 };

 void HeapInspection::find_instances_at_safepoint(Klass* k, GrowableArray<oop>* result) {

   assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped");

   assert(Heap_lock->is_locked(), "should have the Heap_lock");

   // Ensure that the heap is parsable

   Universe::heap()->ensure_parsability(false);  // no need to retire TALBs

   // Iterate over objects in the heap

   FindInstanceClosure fic(k, result);

   // If this operation encounters a bad object when using CMS,

   // consider using safe_object_iterate() which avoids metadata

   // objects that may contain bad references.

   Universe::heap()->object_iterate(&fic);

 }