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