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 /*

  * Copyright (c) 2014, 2018, 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 "jfr/jfrEvents.hpp"

 #include "jfr/leakprofiler/sampling/objectSample.hpp"

 #include "jfr/leakprofiler/sampling/objectSampler.hpp"

 #include "jfr/leakprofiler/sampling/sampleList.hpp"

 #include "jfr/leakprofiler/sampling/samplePriorityQueue.hpp"

 #include "jfr/recorder/jfrEventSetting.inline.hpp"

 #include "jfr/recorder/checkpoint/jfrCheckpointManager.hpp"

 #include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp"

 #include "jfr/support/jfrThreadLocal.hpp"

 #include "jfr/utilities/jfrTryLock.hpp"

 #include "memory/universe.hpp"

 #include "oops/oop.inline.hpp"

 #include "runtime/thread.hpp"

 ObjectSampler::ObjectSampler(size_t size) :

   _priority_queue(new SamplePriorityQueue(size)),

   _list(new SampleList(size)),

   _last_sweep(JfrTicks::now()),

   _total_allocated(0),

   _threshold(0),

   _size(size),

   _tryLock(0),

   _dead_samples(false) {}

 ObjectSampler::~ObjectSampler() {

   delete _priority_queue;

   _priority_queue = NULL;

   delete _list;

   _list = NULL;

 }

 void ObjectSampler::add(HeapWord* obj, size_t allocated, JavaThread* thread) {

   assert(thread != NULL, "invariant");

   const traceid thread_id = thread->threadObj() != NULL ? thread->jfr_thread_local()->thread_id() : 0;

   if (thread_id == 0) {

     return;

   }

   assert(thread_id != 0, "invariant");

   if (!thread->jfr_thread_local()->has_thread_checkpoint()) {

     JfrCheckpointManager::create_thread_checkpoint(thread);

     assert(thread->jfr_thread_local()->has_thread_checkpoint(), "invariant");

   }

   traceid stack_trace_id = 0;

   unsigned int stack_trace_hash = 0;

   if (JfrEventSetting::has_stacktrace(EventOldObjectSample::eventId)) {

     stack_trace_id = JfrStackTraceRepository::record(thread, 0, &stack_trace_hash);

     thread->jfr_thread_local()->set_cached_stack_trace_id(stack_trace_id, stack_trace_hash);

   }

   JfrTryLock tryLock(&_tryLock);

   if (!tryLock.has_lock()) {

     if (LogJFR && Verbose) tty->print_cr("Skipping old object sample due to lock contention");

     return;

   }

   if (_dead_samples) {

     scavenge();

     assert(!_dead_samples, "invariant");

   }

   _total_allocated += allocated;

   const size_t span = _total_allocated - _priority_queue->total();

   ObjectSample* sample;

   if ((size_t)_priority_queue->count() == _size) {

     assert(_list->count() == _size, "invariant");

     const ObjectSample* peek = _priority_queue->peek();

     if (peek->span() > span) {

       // quick reject, will not fit

       return;

     }

     sample = _list->reuse(_priority_queue->pop());

   } else {

     sample = _list->get();

   }

   assert(sample != NULL, "invariant");

   assert(thread_id != 0, "invariant");

   sample->set_thread_id(thread_id);

   sample->set_thread_checkpoint(thread->jfr_thread_local()->thread_checkpoint());

   if (stack_trace_id != 0) {

     sample->set_stack_trace_id(stack_trace_id);

     sample->set_stack_trace_hash(stack_trace_hash);

   }

   sample->set_span(allocated);

   sample->set_object((oop)obj);

   sample->set_allocated(allocated);

   sample->set_allocation_time(JfrTicks::now());

   sample->set_heap_used_at_last_gc(Universe::get_heap_used_at_last_gc());

   _priority_queue->push(sample);

 }

 const ObjectSample* ObjectSampler::last() const {

   return _list->last();

 }

 const ObjectSample* ObjectSampler::last_resolved() const {

   return _list->last_resolved();

 }

 void ObjectSampler::set_last_resolved(const ObjectSample* sample) {

   _list->set_last_resolved(sample);

 }

 void ObjectSampler::oops_do(BoolObjectClosure* is_alive, OopClosure* f) {

   ObjectSample* current = _list->last();

   while (current != NULL) {

     ObjectSample* next = current->next();

     if (!current->is_dead()) {

       if (is_alive->do_object_b(current->object())) {

         // The weakly referenced object is alive, update pointer

         f->do_oop(const_cast<oop*>(current->object_addr()));

       } else {

         current->set_dead();

         _dead_samples = true;

       }

     }

     current = next;

   }

   _last_sweep = JfrTicks::now();

 }

 void ObjectSampler::remove_dead(ObjectSample* sample) {

   assert(sample != NULL, "invariant");

   assert(sample->is_dead(), "invariant");

   ObjectSample* const previous = sample->prev();

   // push span on to previous

   if (previous != NULL) {

     _priority_queue->remove(previous);

     previous->add_span(sample->span());

     _priority_queue->push(previous);

   }

   _priority_queue->remove(sample);

   _list->release(sample);

 }

 void ObjectSampler::scavenge() {

   ObjectSample* current = _list->last();

   while (current != NULL) {

     ObjectSample* next = current->next();

     if (current->is_dead()) {

       remove_dead(current);

     }

     current = next;

   }

   _dead_samples = false;

 }

 int ObjectSampler::item_count() const {

   return _priority_queue->count();

 }

 const ObjectSample* ObjectSampler::item_at(int index) const {

   return _priority_queue->item_at(index);

 }

 ObjectSample* ObjectSampler::item_at(int index) {

   return const_cast<ObjectSample*>(

     const_cast<const ObjectSampler*>(this)->item_at(index)

                                    );

 }

 const JfrTicks& ObjectSampler::last_sweep() const {

   return _last_sweep;

 }