1 /*

     2  * Copyright (c) 2015, 2018, Red Hat, Inc. All rights reserved.

     3  *

     4  * This code is free software; you can redistribute it and/or modify it

     5  * under the terms of the GNU General Public License version 2 only, as

     6  * published by the Free Software Foundation.

     7  *

     8  * This code is distributed in the hope that it will be useful, but WITHOUT

     9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    11  * version 2 for more details (a copy is included in the LICENSE file that

    12  * accompanied this code).

    13  *

    14  * You should have received a copy of the GNU General Public License version

    15  * 2 along with this work; if not, write to the Free Software Foundation,

    16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    17  *

    18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    19  * or visit www.oracle.com if you need additional information or have any

    20  * questions.

    21  *

    22  */

    23 

    24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHBROOKSPOINTER_INLINE_HPP

    25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHBROOKSPOINTER_INLINE_HPP

    26 

    27 #include "gc/shenandoah/shenandoahAsserts.hpp"

    28 #include "gc/shenandoah/shenandoahBrooksPointer.hpp"

    29 #include "runtime/atomic.hpp"

    30 

    31 inline HeapWord** ShenandoahBrooksPointer::brooks_ptr_addr(oop obj) {

    32   return (HeapWord**)((HeapWord*) obj + word_offset());

    33 }

    34 

    35 inline void ShenandoahBrooksPointer::initialize(oop obj) {

    36   shenandoah_assert_in_heap(NULL, obj);

    37   *brooks_ptr_addr(obj) = (HeapWord*) obj;

    38 }

    39 

    40 inline void ShenandoahBrooksPointer::set_raw(oop obj, HeapWord* update) {

    41   shenandoah_assert_in_heap(NULL, obj);

    42   *brooks_ptr_addr(obj) = update;

    43 }

    44 

    45 inline HeapWord* ShenandoahBrooksPointer::get_raw(oop obj) {

    46   shenandoah_assert_in_heap(NULL, obj);

    47   return *brooks_ptr_addr(obj);

    48 }

    49 

    50 inline HeapWord* ShenandoahBrooksPointer::get_raw_unchecked(oop obj) {

    51   return *brooks_ptr_addr(obj);

    52 }

    53 

    54 inline oop ShenandoahBrooksPointer::forwardee(oop obj) {

    55   shenandoah_assert_correct(NULL, obj);

    56   return oop(*brooks_ptr_addr(obj));

    57 }

    58 

    59 inline oop ShenandoahBrooksPointer::try_update_forwardee(oop obj, oop update) {

    60   oop result = (oop) Atomic::cmpxchg(update, (oop*)brooks_ptr_addr(obj), obj);

    61   shenandoah_assert_correct_except(NULL, obj, !oopDesc::equals_raw(result, obj));

    62   return result;

    63 }

    64 

    65 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHBROOKSPOINTER_INLINE_HPP