/*

 * 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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 */

inline void PSScavenge::save_to_space_top_before_gc() {

  ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();

  _to_space_top_before_gc = heap->young_gen()->to_space()->top();

}

template <class T> inline bool PSScavenge::should_scavenge(T* p) {

  T heap_oop = oopDesc::load_heap_oop(p);

  if (oopDesc::is_null(heap_oop)) return false;

  oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);

  return PSScavenge::is_obj_in_young((HeapWord*)obj);

}

template <class T>

inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) {

  if (should_scavenge(p)) {

    oop obj = oopDesc::load_decode_heap_oop_not_null(p);

    // Skip objects copied to to_space since the scavenge started.

    HeapWord* const addr = (HeapWord*)obj;

    return addr < to_space_top_before_gc() || addr >= to_space->end();

  }

  return false;

}

template <class T>

inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) {

  if (check_to_space) {

    ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();

    return should_scavenge(p, heap->young_gen()->to_space());

  }

  return should_scavenge(p);

}

// Attempt to "claim" oop at p via CAS, push the new obj if successful

// This version tests the oop* to make sure it is within the heap before

// attempting marking.

template <class T>

inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm,

                                                   T*                  p) {

  assert(should_scavenge(p, true), "revisiting object?");

  oop o = oopDesc::load_decode_heap_oop_not_null(p);

  oop new_obj = o->is_forwarded()

        ? o->forwardee()

        : pm->copy_to_survivor_space(o);

  oopDesc::encode_store_heap_oop_not_null(p, new_obj);

  // We cannot mark without test, as some code passes us pointers

  // that are outside the heap.

  if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) &&

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

    if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) {

      card_table()->inline_write_ref_field_gc(p, new_obj);

    }

  }

}