15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  *
23  */
24 
25 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_INLINE_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_INLINE_HPP
27 
28 #include "gc/shenandoah/shenandoahForwarding.hpp"
29 
30 #include "gc/shenandoah/shenandoahAsserts.hpp"
31 #include "oops/markWord.hpp"
32 #include "runtime/javaThread.hpp"
33 
34 inline oop ShenandoahForwarding::get_forwardee_raw(oop obj) {
35   shenandoah_assert_in_heap(nullptr, obj);
36   return get_forwardee_raw_unchecked(obj);
37 }
38 
39 inline oop ShenandoahForwarding::get_forwardee_raw_unchecked(oop obj) {
40   // JVMTI and JFR code use mark words for marking objects for their needs.
41   // On this path, we can encounter the "marked" object, but with null
42   // fwdptr. That object is still not forwarded, and we need to return
43   // the object itself.
44   markWord mark = obj->mark();
45   if (mark.is_marked()) {
46     HeapWord* fwdptr = (HeapWord*) mark.clear_lock_bits().to_pointer();
47     if (fwdptr != nullptr) {
48       return cast_to_oop(fwdptr);
49     }
50   }
51   return obj;
52 }
53 
54 inline oop ShenandoahForwarding::get_forwardee_mutator(oop obj) {
55   // Same as above, but mutator thread cannot ever see null forwardee.

15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  *
23  */
24 
25 #ifndef SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_INLINE_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_INLINE_HPP
27 
28 #include "gc/shenandoah/shenandoahForwarding.hpp"
29 
30 #include "gc/shenandoah/shenandoahAsserts.hpp"
31 #include "oops/markWord.hpp"
32 #include "runtime/javaThread.hpp"
33 
34 inline oop ShenandoahForwarding::get_forwardee_raw(oop obj) {
35   shenandoah_assert_in_heap_bounds(nullptr, obj);
36   return get_forwardee_raw_unchecked(obj);
37 }
38 
39 inline oop ShenandoahForwarding::get_forwardee_raw_unchecked(oop obj) {
40   // JVMTI and JFR code use mark words for marking objects for their needs.
41   // On this path, we can encounter the "marked" object, but with null
42   // fwdptr. That object is still not forwarded, and we need to return
43   // the object itself.
44   markWord mark = obj->mark();
45   if (mark.is_marked()) {
46     HeapWord* fwdptr = (HeapWord*) mark.clear_lock_bits().to_pointer();
47     if (fwdptr != nullptr) {
48       return cast_to_oop(fwdptr);
49     }
50   }
51   return obj;
52 }
53 
54 inline oop ShenandoahForwarding::get_forwardee_mutator(oop obj) {
55   // Same as above, but mutator thread cannot ever see null forwardee.