Re: [PATCH] Add tests for Bitmapset

Michael Paquier <michael@paquier.xyz> writes:
> On Tue, Sep 23, 2025 at 01:43:47AM -0400, Tom Lane wrote:
>> This patch seems to be rather full of arbitrary casts to or
>> from Datum, which is no longer okay.  You need to be using
>> the appropriate conversion macros, such as PointerGetDatum.

> Right, this can ve reproduced with a -m32 added to gcc.

Curiously, I don't see these warnings on 32-bit FreeBSD
(with clang version 19.1.7).  But I tested your patch on
mamba's host and confirmed that it makes that gcc happy.

> I don't see a need for a Datum manipulation in these conversion
> macros, as we already allocate the results to and from "text"
> before/after using the GETARG or RETURN macros.  Using directly
> text_to_cstring() and cstring_to_text() takes care of the warnings, as
> well.

Yeah, this is better, but I think the new macros could use a bit
more parenthesis-twiddling:

+#define BITMAPSET_TO_TEXT(bms) cstring_to_text(nodeToString((bms)))

The extra parens around "bms" are surely unnecessary.  (If they were
necessary, it could only be because nodeToString was a macro that
failed to parenthesize its argument where needed.  But that would
be a bug to fix in nodeToString, not here.)

+#define TEXT_TO_BITMAPSET(str) (Bitmapset *) stringToNode(text_to_cstring(str))

Here, on the other hand, I think an extra outer set of parens
would be a good idea, ie

+#define TEXT_TO_BITMAPSET(str) ((Bitmapset *) stringToNode(text_to_cstring(str)))

It may be that the C cast binds tightly enough that this cannot
be a problem, but I don't think assuming that is project style.

            regards, tom lane