tree efe3dd581dbe9fb33e615d1608f0571ec3984208
parent 188edb3a3ec36ad5fc42373b1e1bed3a85b4f112
author Roland Levillain <rpl@google.com> 1477483418 +0100
committer Roland Levillain <rpl@google.com> 1477483418 +0100

Add support for Baker read barriers in UnsafeCASObject intrinsics.

Prior to doing the compare-and-swap operation, ensure the
expected reference stored in the holding object's field is
in the to-space by loading it, emitting a read barrier and
updating that field with a strong compare-and-set operation
with relaxed memory synchronization ordering (if needed).

Test: ART host and target tests and Nexus 5X boot test with Baker read barriers.
Bug: 29516905
Bug: 12687968
Change-Id: I480f6a9b59547f11d0a04777406b9bfeb905bfd2