For `IS_DEST_UNINITIALIZED` it would never be valid for the CardTableBarrierSet to do a pre-barrier. Currently `value_copy_in_heap` and `value_store_null_in_heap` both iterates the oops and virtually calls into the barriers sets pre barriers (of which all implementations are no-ops for uninitialized values).
Remove this as part of the `CardTableBarrierSet` interface. After this is integrated I will upstream the relevant changes of this patch to mainline. ------------- Commit messages: - 8378521: [lworld] Completely remove pre-barriers in CardTableBarrierSet when IS_DEST_UNINITIALIZED for value stores Changes: https://git.openjdk.org/valhalla/pull/2200/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2200&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8378521 Stats: 45 lines in 5 files changed: 3 ins; 8 del; 34 mod Patch: https://git.openjdk.org/valhalla/pull/2200.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2200/head:pull/2200 PR: https://git.openjdk.org/valhalla/pull/2200
