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From: Tom Lane <[email protected]>
To: Michael Paquier <[email protected]>
Cc: Greg Burd <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: Robert Haas <[email protected]>
Cc: Nathan Bossart <[email protected]>
Cc: Masahiko Sawada <[email protected]>
Subject: Re: [PATCH] Add tests for Bitmapset
Date: Tue, 23 Sep 2025 12:46:49 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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Michael Paquier <[email protected]> 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

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