[PATCH] D152140: [Clang] Limit FunctionTypeExtraBitfields::NumExceptionType to 16 bits.

[Sander de Smalen via Phabricator via cfe-commits]

sdesmalen added inline comments.


================
Comment at: clang/include/clang/AST/Type.h:3956
     /// [implimits] 8 bits would be enough here.
-    unsigned NumExceptionType = 0;
+    unsigned NumExceptionType : 16;
+
----------------
erichkeane wrote:
> tbaeder wrote:
> > Isn't using a `uint16_t` preferred over a bitfield?
> Ah, thats a great point, yes, I think that is probably better here!  I like the assert on setting it (particularly because we're shrinking it!), but that idea makes this patch much smaller.
The reason for making this a bitfield rather than uint16_t is because D127762 extends the struct with another (bit)field:

    /// Any AArch64 SME ACLE type attributes that need to be propagated
    /// on declarations and function pointers.
    unsigned AArch64SMEAttributes : 6;

I thought having this all be bitfields made more sense, but I'm happy to change it to a uint16_t if that is preferred.

> that idea makes this patch much smaller
I suspect that the assert is still required to ensure that the value stored fits the value? Using `uint16_t` doesn't change that, or did I miss something? :)


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D152140/new/

https://reviews.llvm.org/D152140