12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
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_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_HPP
27
28 #include "oops/oop.hpp"
29 #include "utilities/globalDefinitions.hpp"
30
31 class ShenandoahForwarding {
32 public:
33 /* Gets forwardee from the given object.
34 */
35 static inline oop get_forwardee(oop obj);
36
37 /* Gets forwardee from the given object. Only from mutator thread.
38 */
39 static inline oop get_forwardee_mutator(oop obj);
40
41 /* Returns the raw value from forwardee slot.
42 */
43 static inline oop get_forwardee_raw(oop obj);
44
45 /* Returns the raw value from forwardee slot without any checks.
46 * Used for quick verification.
47 */
48 static inline oop get_forwardee_raw_unchecked(oop obj);
49
50 /**
51 * Returns true if the object is forwarded, false otherwise.
52 */
53 static inline bool is_forwarded(oop obj);
54
55 /* Tries to atomically update forwardee in $holder object to $update.
56 * Assumes $holder points at itself.
57 * Asserts $holder is in from-space.
58 * Asserts $update is in to-space.
59 *
60 * Returns the new object 'update' upon success, or
61 * the new forwardee that a competing thread installed.
62 */
63 static inline oop try_update_forwardee(oop obj, oop update);
64
65 static inline size_t size(oop obj);
66 static inline Klass* klass(oop obj);
67 };
68
69 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_HPP
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12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
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_HPP
26 #define SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_HPP
27
28 #include "oops/oop.hpp"
29 #include "utilities/globalDefinitions.hpp"
30
31 class ShenandoahForwarding {
32 private:
33 static const uintptr_t FWDED_HASH_TRANSITION = 0b111;
34
35 public:
36 /* Gets forwardee from the given object.
37 */
38 static inline oop get_forwardee(oop obj);
39
40 /* Gets forwardee from the given object. Only from mutator thread.
41 */
42 static inline oop get_forwardee_mutator(oop obj);
43
44 /* Returns the raw value from forwardee slot.
45 */
46 static inline oop get_forwardee_raw(oop obj);
47
48 /* Returns the raw value from forwardee slot without any checks.
49 * Used for quick verification.
50 */
51 static inline oop get_forwardee_raw_unchecked(oop obj);
52
53 /**
54 * Returns true if the object is forwarded, false otherwise.
55 */
56 static inline bool is_forwarded(oop obj);
57 static inline bool is_forwarded(markWord m);
58
59 /* Tries to atomically update forwardee in $holder object to $update.
60 * Assumes $holder points at itself.
61 * Asserts $holder is in from-space.
62 * Asserts $update is in to-space.
63 *
64 * Returns the new object 'update' upon success, or
65 * the new forwardee that a competing thread installed.
66 */
67 static inline oop try_update_forwardee(oop obj, oop update);
68
69 static inline size_t size(oop obj);
70 static inline Klass* klass(oop obj);
71 };
72
73 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_HPP
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