tree 864887bc5e1220152998874d3be861b31a49b0fa
parent 3b2bcbf9daf39f4cece7fde1186f3fa494000ed9
author Hiroshi Yamauchi <yamauchi@google.com> 1400215439 -0700
committer Hiroshi Yamauchi <yamauchi@google.com> 1400272665 -0700

Visit methods in stack frames during root visits.

This is necessary for a Baker-style read barrier to-space invariant to
hold. That is, an object either needs to be marked/forwarded as root
or it must be accessed only through a read barrier by mutators. Since
stack frames have direct pointers to methods that a mutator can access
without a read barrier, stack frame methods have to be visited as
root, which makes sense as stack frames are thread roots. This is the
case even if methods do not move as they have to be marked 'gray' for
the objects pointed to by them, which can move, to be recursively
marked/forwarded.

This also puts us in the right direction toward moving methods (and
fields) in the future.

Bug: 12687968
Change-Id: Id32b913c021a140073deea9149a8782e8f308303