/*

 * Copyright (c) 2001, 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.

 *

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#ifndef SHARE_VM_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP

#define SHARE_VM_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP

#include "gc/serial/defNewGeneration.hpp"

#include "gc/shared/cardTableRS.hpp"

#include "gc/shared/genCollectedHeap.hpp"

#include "gc/shared/genOopClosures.inline.hpp"

#include "gc/shared/space.inline.hpp"

#include "oops/access.inline.hpp"

// Methods of protected closure types

template <class T>

inline void DefNewGeneration::KeepAliveClosure::do_oop_work(T* p) {

#ifdef ASSERT

  {

    // We never expect to see a null reference being processed

    // as a weak reference.

    oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);

    assert (oopDesc::is_oop(obj), "expected an oop while scanning weak refs");

  }

#endif // ASSERT

  // Card marking is trickier for weak refs.

  // This oop is a 'next' field which was filled in while we

  // were discovering weak references. While we might not need

  // to take a special action to keep this reference alive, we

  // will need to dirty a card as the field was modified.

  //

  // Alternatively, we could create a method which iterates through

  // each generation, allowing them in turn to examine the modified

  // field.

  //

  // We could check that p is also in the old generation, but

  // dirty cards in the young gen are never scanned, so the

  // extra check probably isn't worthwhile.

  if (GenCollectedHeap::heap()->is_in_reserved(p)) {

    oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);

    _rs->inline_write_ref_field_gc(p, obj);

  }

}

template <class T>

inline void DefNewGeneration::FastKeepAliveClosure::do_oop_work(T* p) {

#ifdef ASSERT

  {

    // We never expect to see a null reference being processed

    // as a weak reference.

    oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);

    assert (oopDesc::is_oop(obj), "expected an oop while scanning weak refs");

  }

#endif // ASSERT

  // Optimized for Defnew generation if it's the youngest generation:

  // we set a younger_gen card if we have an older->youngest

  // generation pointer.

  oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);

  if (((HeapWord*)obj < _boundary) && GenCollectedHeap::heap()->is_in_reserved(p)) {

    _rs->inline_write_ref_field_gc(p, obj);

  }

}

template <typename OopClosureType>

void DefNewGeneration::oop_since_save_marks_iterate(OopClosureType* cl) {

  cl->set_generation(this);

  eden()->oop_since_save_marks_iterate(cl);

  to()->oop_since_save_marks_iterate(cl);

  from()->oop_since_save_marks_iterate(cl);

  cl->reset_generation();

  save_marks();

}

#endif // SHARE_VM_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP