1 /*
   2  * Copyright (c) 2015, Red Hat, Inc. and/or its affiliates.
   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_BROOKSPOINTER_INLINE_HPP
  25 #define SHARE_VM_GC_SHENANDOAH_BROOKSPOINTER_INLINE_HPP
  26 
  27 #include "gc_implementation/shenandoah/brooksPointer.hpp"
  28 #include "gc_implementation/shenandoah/shenandoahAsserts.hpp"
  29 #include "gc_implementation/shenandoah/shenandoahHeap.hpp"
  30 #include "gc_implementation/shenandoah/shenandoahHeapRegion.hpp"
  31 #include "gc_implementation/shenandoah/shenandoahLogging.hpp"
  32 #include "runtime/atomic.hpp"
  33 
  34 inline HeapWord** BrooksPointer::brooks_ptr_addr(oop obj) {
  35   return (HeapWord**)((HeapWord*) obj + word_offset());
  36 }
  37 
  38 inline void BrooksPointer::initialize(oop obj) {
  39   shenandoah_assert_in_heap(NULL, obj);
  40   *brooks_ptr_addr(obj) = (HeapWord*) obj;
  41 }
  42 
  43 inline void BrooksPointer::set_raw(oop obj, HeapWord* update) {
  44   shenandoah_assert_in_heap(NULL, obj);
  45   *brooks_ptr_addr(obj) = update;
  46 }
  47 
  48 inline HeapWord* BrooksPointer::get_raw(oop obj) {
  49   shenandoah_assert_in_heap(NULL, obj);
  50   return *brooks_ptr_addr(obj);
  51 }
  52 
  53 inline HeapWord* BrooksPointer::get_raw_unchecked(oop obj) {
  54   return *brooks_ptr_addr(obj);
  55 }
  56 
  57 inline oop BrooksPointer::forwardee(oop obj) {
  58   shenandoah_assert_correct(NULL, obj);
  59   return oop(*brooks_ptr_addr(obj));
  60 }
  61 
  62 inline oop BrooksPointer::try_update_forwardee(oop obj, oop update) {
  63   oop result = (oop) Atomic::cmpxchg_ptr(update, brooks_ptr_addr(obj), obj);
  64   shenandoah_assert_correct_except(NULL, obj, !oopDesc::unsafe_equals(result, obj));
  65   return result;
  66 }
  67 
  68 #endif // SHARE_VM_GC_SHENANDOAH_BROOKSPOINTER_INLINE_HPP