/*

 * 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

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 */

inline void MarkSweep::mark_object(oop obj) {

  // some marks may contain information we need to preserve so we store them away

  // and overwrite the mark.  We'll restore it at the end of markSweep.

  markOop mark = obj->mark();

  obj->set_mark(markOopDesc::prototype()->set_marked());

  if (mark->must_be_preserved(obj)) {

    preserve_mark(obj, mark);

  }

}

template <class T> inline void MarkSweep::follow_root(T* p) {

  assert(!Universe::heap()->is_in_reserved(p),

         "roots shouldn't be things within the heap");

#ifdef VALIDATE_MARK_SWEEP

  if (ValidateMarkSweep) {

    guarantee(!_root_refs_stack->contains(p), "should only be in here once");

    _root_refs_stack->push(p);

  }

#endif

  T heap_oop = oopDesc::load_heap_oop(p);

  if (!oopDesc::is_null(heap_oop)) {

    oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);

    if (!obj->mark()->is_marked()) {

      mark_object(obj);

      obj->follow_contents();

    }

  }

  follow_stack();

}

template <class T> inline void MarkSweep::mark_and_follow(T* p) {

//  assert(Universe::heap()->is_in_reserved(p), "should be in object space");

  T heap_oop = oopDesc::load_heap_oop(p);

  if (!oopDesc::is_null(heap_oop)) {

    oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);

    if (!obj->mark()->is_marked()) {

      mark_object(obj);

      obj->follow_contents();

    }

  }

}

template <class T> inline void MarkSweep::mark_and_push(T* p) {

//  assert(Universe::heap()->is_in_reserved(p), "should be in object space");

  T heap_oop = oopDesc::load_heap_oop(p);

  if (!oopDesc::is_null(heap_oop)) {

    oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);

    if (!obj->mark()->is_marked()) {

      mark_object(obj);

      _marking_stack.push(obj);

    }

  }

}

void MarkSweep::push_objarray(oop obj, size_t index) {

  ObjArrayTask task(obj, index);

  assert(task.is_valid(), "bad ObjArrayTask");

  _objarray_stack.push(task);

}

template <class T> inline void MarkSweep::adjust_pointer(T* p, bool isroot) {

  T heap_oop = oopDesc::load_heap_oop(p);

  if (!oopDesc::is_null(heap_oop)) {

    oop obj     = oopDesc::decode_heap_oop_not_null(heap_oop);

    oop new_obj = oop(obj->mark()->decode_pointer());

    assert(new_obj != NULL ||                         // is forwarding ptr?

           obj->mark() == markOopDesc::prototype() || // not gc marked?

           (UseBiasedLocking && obj->mark()->has_bias_pattern()) ||

                                                      // not gc marked?

           obj->is_shared(),                          // never forwarded?

           "should be forwarded");

    if (new_obj != NULL) {

      assert(Universe::heap()->is_in_reserved(new_obj),

             "should be in object space");

      oopDesc::encode_store_heap_oop_not_null(p, new_obj);

    }

  }

  VALIDATE_MARK_SWEEP_ONLY(track_adjusted_pointer(p, isroot));

}

template <class T> inline void MarkSweep::KeepAliveClosure::do_oop_work(T* p) {

#ifdef VALIDATE_MARK_SWEEP

  if (ValidateMarkSweep) {

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

      _root_refs_stack->push(p);

    } else {

      _other_refs_stack->push(p);

    }

  }

#endif

  mark_and_push(p);

}