/*

 * Copyright (c) 2001, 2008, 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

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 */

// 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.

    assert (!oopDesc::is_null(*p), "expected non-null ref");

    oop obj = oopDesc::load_decode_heap_oop_not_null(p);

    assert (obj->is_oop(), "expected an oop while scanning weak refs");

  }

#endif // ASSERT

  _cl->do_oop_nv(p);

  // 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 an older generation, but

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

  // extra check probably isn't worthwhile.

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

    oop obj = oopDesc::load_decode_heap_oop_not_null(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.

    assert (!oopDesc::is_null(*p), "expected non-null ref");

    oop obj = oopDesc::load_decode_heap_oop_not_null(p);

    assert (obj->is_oop(), "expected an oop while scanning weak refs");

  }

#endif // ASSERT

  _cl->do_oop_nv(p);

  // 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 = oopDesc::load_decode_heap_oop_not_null(p);

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

    _rs->inline_write_ref_field_gc(p, obj);

  }

}