tree 830c8c6b7aeea562bb9b6709819fdb850df80881
parent 5c4b3cc8b167ff492e5ec6d414416b67c7dd501f
author Roland Levillain <rpl@google.com> 1531246771 +0100
committer Roland Levillain <rpl@google.com> 1534870381 +0100

Sweep only objects in the live stack in sticky-bit CC collections.

Reuse the same strategy used in sticky-bit Concurrent Mark-Sweep
(CMS) collections for sticky-bit Concurrent Copying (CC) collections
walk the live stack (which contains allocations made outside the
region space since the previous GC thread flip phase) and free
unmarked objects.

As a side effect, this change address a bug that used to trigger GC
crashes during a sticky-bit CC (young-generation) collection involving
an unreachable newly allocated object in the non-moving space with a
dangling reference to an object cleared or moved from a newly
allocated region of the region space.

Test: ART run-tests & gtests, libcore tests, JDWP tests (host & device)
Test: Device/emulator boot test
Bug: 67628039
Bug: 12687968
Change-Id: If5d94d854effdc8a614c1c3e3facb2221824aff2