jdk8-mips64-public/hotspot: src/share/vm/memory/heapInspection.cpp@ec98e58952b2 (annotated)

src/share/vm/memory/heapInspection.cpp@ec98e58952b2 (annotated)

src/share/vm/memory/heapInspection.cpp

Tue, 11 Sep 2012 14:59:23 +0200

author: stefank
date: Tue, 11 Sep 2012 14:59:23 +0200
changeset 4050: ec98e58952b2
parent 4037: da91efe96a93
child 4497: 16fb9f942703
child 4542: db9981fd3124
permissions: -rw-r--r--

7197350: NPG: jvmtiHeapReferenceCallback receives incorrect reference_kind for system class roots
Summary: Fix the iteration over the system classes and report the correct reference kind.
Reviewed-by: coleenp, rbackman

 /*
  * Copyright (c) 2002, 2012, 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 "gc_interface/collectedHeap.hpp"
 #include "memory/genCollectedHeap.hpp"
 #include "memory/heapInspection.hpp"
 #include "memory/resourceArea.hpp"
 #include "runtime/os.hpp"
 #include "utilities/globalDefinitions.hpp"
 #ifndef SERIALGC
 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
 #endif
 // 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;
   }
   return 0;
 }
 void KlassInfoEntry::print_on(outputStream* st) const {
   ResourceMark rm;
   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>";
   }
   // 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 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;
   }
 }
 KlassInfoTable::KlassInfoTable(int size, HeapWord* ref) {
   _size = 0;
   _ref = ref;
   _buckets = NEW_C_HEAP_ARRAY(KlassInfoBucket, size, mtInternal);
   if (_buckets != NULL) {
     _size = size;
     for (int index = 0; index < _size; index++) {
       _buckets[index].initialize();
     }
   }
 }
 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(Klass* p) {
   assert(p->is_metadata(), "all klasses are metadata");
   return (uint)(((uintptr_t)p - (uintptr_t)_ref) >> 2);
 }
 KlassInfoEntry* KlassInfoTable::lookup(Klass* const 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());
     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);
   }
 }
 int KlassInfoHisto::sort_helper(KlassInfoEntry** e1, KlassInfoEntry** e2) {
   return (*e1)->compare(*e1,*e2);
 }
 KlassInfoHisto::KlassInfoHisto(const char* title, int estimatedCount) :
   _title(title) {
   _elements = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<KlassInfoEntry*>(estimatedCount,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);
 }
 void KlassInfoHisto::print_on(outputStream* st) const {
   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;
  public:
   RecordInstanceClosure(KlassInfoTable* cit) :
     _cit(cit), _missed_count(0) {}
   void do_object(oop obj) {
     if (!_cit->record_instance(obj)) {
       _missed_count++;
     }
   }
   size_t missed_count() { return _missed_count; }
 };
 void HeapInspection::heap_inspection(outputStream* st, bool need_prologue) {
   ResourceMark rm;
   // Get some random number for ref (the hash key)
   HeapWord* ref = (HeapWord*) Universe::boolArrayKlassObj();
   CollectedHeap* heap = Universe::heap();
   bool is_shared_heap = false;
   // Collect klass instance info
   KlassInfoTable cit(KlassInfoTable::cit_size, ref);
   if (!cit.allocation_failed()) {
     // Iterate over objects in the heap
     RecordInstanceClosure ric(&cit);
     Universe::heap()->object_iterate(&ric);
     // Report if certain classes are not counted because of
     // running out of C-heap for the histogram.
     size_t missed_count = ric.missed_count();
     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
     KlassInfoHisto histo("\n"
                      " num     #instances         #bytes  class name\n"
                      "----------------------------------------------",
                      KlassInfoHisto::histo_initial_size);
     HistoClosure hc(&histo);
     cit.iterate(&hc);
     histo.sort();
     histo.print_on(st);
   } else {
     st->print_cr("WARNING: Ran out of C-heap; histogram not generated");
   }
   st->flush();
   if (need_prologue && is_shared_heap) {
     SharedHeap* sh = (SharedHeap*)heap;
     sh->gc_epilogue(false /* !full */); // release all acquired locks, etc.
   }
 }
 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);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/memory/heapInspection.cpp@ec98e58952b2 (annotated)

src/share/vm/memory/heapInspection.cpp