/*

 * Copyright 2002-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

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();

}

inline bool PSScavenge::should_scavenge(oop p) {

  return p == NULL ? false : PSScavenge::is_obj_in_young((HeapWord*) p);

}

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

  if (should_scavenge(p)) {

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

    HeapWord* const addr = (HeapWord*) p;

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

  }

  return false;

}

inline bool PSScavenge::should_scavenge(oop 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.

inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm,

                                                   oop*                p) {

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

  oop o = *p;

  if (o->is_forwarded()) {

    *p = o->forwardee();

  } else {

    *p = pm->copy_to_survivor_space(o, pm->depth_first());

  }

  // 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)) {

    o = *p;

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

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

    }

  }

}