/*

 * Copyright (c) 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 "runtime/atomic.hpp"

#include "services/memBaseline.hpp"

#include "services/memRecorder.hpp"

#include "services/memPtr.hpp"

#include "services/memTracker.hpp"

MemPointer* SequencedRecordIterator::next_record() {

  MemPointerRecord* itr_cur = (MemPointerRecord*)_itr.current();

  if (itr_cur == NULL)  {

    return itr_cur;

  }

  MemPointerRecord* itr_next = (MemPointerRecord*)_itr.next();

  // don't collapse virtual memory records

  while (itr_next != NULL && !itr_cur->is_vm_pointer() &&

    !itr_next->is_vm_pointer() &&

    same_kind(itr_cur, itr_next)) {

    itr_cur = itr_next;

    itr_next = (MemPointerRecord*)_itr.next();

  }

  return itr_cur;

}

volatile jint MemRecorder::_instance_count = 0;

MemRecorder::MemRecorder() {

  assert(MemTracker::is_on(), "Native memory tracking is off");

  Atomic::inc(&_instance_count);

  debug_only(set_generation();)

  if (MemTracker::track_callsite()) {

    _pointer_records = new (std::nothrow)FixedSizeMemPointerArray<SeqMemPointerRecordEx,

        DEFAULT_RECORDER_PTR_ARRAY_SIZE>();

  } else {

    _pointer_records = new (std::nothrow)FixedSizeMemPointerArray<SeqMemPointerRecord,

        DEFAULT_RECORDER_PTR_ARRAY_SIZE>();

  }

  _next = NULL;

  if (_pointer_records != NULL) {

    // recode itself

    record((address)this, (MemPointerRecord::malloc_tag()|mtNMT|otNMTRecorder),

        sizeof(MemRecorder), CALLER_PC);

    record((address)_pointer_records, (MemPointerRecord::malloc_tag()|mtNMT|otNMTRecorder),

        _pointer_records->instance_size(),CURRENT_PC);

  }

}

MemRecorder::~MemRecorder() {

  if (_pointer_records != NULL) {

    if (MemTracker::is_on()) {

      MemTracker::record_free((address)_pointer_records, mtNMT);

      MemTracker::record_free((address)this, mtNMT);

    }

    delete _pointer_records;

  }

  // delete all linked recorders

  while (_next != NULL) {

    MemRecorder* tmp = _next;

    _next = _next->next();

    tmp->set_next(NULL);

    delete tmp;

  }

  Atomic::dec(&_instance_count);

}

// Sorting order:

//   1. memory block address

//   2. mem pointer record tags

//   3. sequence number

int MemRecorder::sort_record_fn(const void* e1, const void* e2) {

  const MemPointerRecord* p1 = (const MemPointerRecord*)e1;

  const MemPointerRecord* p2 = (const MemPointerRecord*)e2;

  int delta = UNSIGNED_COMPARE(p1->addr(), p2->addr());

  if (delta == 0) {

    int df = UNSIGNED_COMPARE((p1->flags() & MemPointerRecord::tag_masks),

                              (p2->flags() & MemPointerRecord::tag_masks));

    if (df == 0) {

      assert(p1->seq() != p2->seq(), "dup seq");

      return p1->seq() - p2->seq();

    } else {

      return df;

    }

  } else {

    return delta;

  }

}

bool MemRecorder::record(address p, MEMFLAGS flags, size_t size, address pc) {

#ifdef ASSERT

  if (MemPointerRecord::is_virtual_memory_record(flags)) {

    assert((flags & MemPointerRecord::tag_masks) != 0, "bad virtual memory record");

  } else {

    assert((flags & MemPointerRecord::tag_masks) == MemPointerRecord::malloc_tag() ||

           (flags & MemPointerRecord::tag_masks) == MemPointerRecord::free_tag() ||

           IS_ARENA_OBJ(flags),

           "bad malloc record");

  }

  // a recorder should only hold records within the same generation

  unsigned long cur_generation = SequenceGenerator::current_generation();

  assert(cur_generation == _generation,

         "this thread did not enter sync point");

#endif

  if (MemTracker::track_callsite()) {

    SeqMemPointerRecordEx ap(p, flags, size, pc);

    debug_only(check_dup_seq(ap.seq());)

    return _pointer_records->append(&ap);

  } else {

    SeqMemPointerRecord ap(p, flags, size);

    debug_only(check_dup_seq(ap.seq());)

    return _pointer_records->append(&ap);

  }

}

  // iterator for alloc pointers

SequencedRecordIterator MemRecorder::pointer_itr() {

  assert(_pointer_records != NULL, "just check");

  _pointer_records->sort((FN_SORT)sort_record_fn);

  return SequencedRecordIterator(_pointer_records);

}

#ifdef ASSERT

void MemRecorder::set_generation() {

  _generation = SequenceGenerator::current_generation();

}

void MemRecorder::check_dup_seq(jint seq) const {

  MemPointerArrayIteratorImpl itr(_pointer_records);

  MemPointerRecord* rc = (MemPointerRecord*)itr.current();

  while (rc != NULL) {

    assert(rc->seq() != seq, "dup seq");

    rc = (MemPointerRecord*)itr.next();

  }

}

#endif