Re: Change GUC hashtable to use simplehash?

On Wed, 2024-03-20 at 14:26 +0700, John Naylor wrote:
> This was the culprit. The search path cache didn't trigger this when
> it went in, but it seems for frontend a read past the end of malloc
> fails -fsantize=address. By the same token, I'm guessing the only
> reason this didn't fail for backend is because almost all strings
> you'd want to use as a hash key won't use a malloc'd external block.
>
> I found that adding __attribute__((no_sanitize_address)) to
> fasthash_accum_cstring_aligned() passes CI. While this kind of
> exception is warned against (for good reason), I think it's fine here
> given that glibc and NetBSD, and probably others, do something
> similar
> for optimized strlen(). Before I write the proper macro for that, are
> there any objections? Better ideas?

It appears that the spelling no_sanitize_address is deprecated in
clang[1] in favor of 'no_sanitize("address")'. It doesn't appear to be
deprecated in gcc[2].

Aside from that, +1.

Regards,
    Jeff Davis

[1]
https://clang.llvm.org/docs/AddressSanitizer.html#disabling-instrumentation-with-attribute-no-sanitize-address
[2] https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html