lebedev.ri marked 2 inline comments as done.
lebedev.ri added a comment.




================
Comment at: clang/docs/ReleaseNotes.rst:238
 
-- ...
+- * ``pointer-overflow`` check was extended added to catch the cases where
+    a non-zero offset being applied, either to a ``nullptr``, or the result
----------------
rsmith wrote:
> Reusing this group seems a little surprising, since the new checks don't seem 
> to have anything to do with overflow. Is the general idea that this warning 
> identifies places where pointer artihmetic leaves the complete object (where, 
> for now, we only catch the case where it wraps around the address space or 
> leaves / reaches a hypothetical size-0 object at the null address)?
As it can be seen in the patch history i initially added this as a new group,
but then merged it back into this group as per @vsk request in 
D67122#inline-602602 :
> Separately, the proposed 'nullptr-and-nonzero-offset' check is interesting 
> only/exactly when the existing 'pointer-overflow' check is interesting, and 
> vice versa. So I don't see the need to make them distinct.

So yes, the idea is that in the retrospect, the `pointer-overflow` name might 
be just too specific,
but this is the same UB, so there is no point in fragmenting it.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D67122/new/

https://reviews.llvm.org/D67122



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