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From: Joseph Myers <joseph@codesourcery.com>
To: Alejandro Colomar <alx.manpages@gmail.com>
Cc: Martin Uecker <uecker@tugraz.at>,
	Ingo Schwarze <schwarze@usta.de>,
	JeanHeyd Meneide <wg14@soasis.org>, <linux-man@vger.kernel.org>,
	<gcc@gcc.gnu.org>
Subject: Re: [PATCH] Various pages: SYNOPSIS: Use VLA syntax in function parameters
Date: Sat, 12 Nov 2022 14:54:10 +0000	[thread overview]
Message-ID: <5ae032cd-7a5f-f72b-29ae-6ad7f418da8@codesourcery.com> (raw)
In-Reply-To: <a1606206-294d-8f7d-eb1d-e8ffe7d3212c@gmail.com>

On Sat, 12 Nov 2022, Alejandro Colomar via Gcc wrote:

> Since it's to be used as an rvalue, not as a lvalue, I guess a
> postfix-expression wouldn't be the right one.

Several forms of postfix-expression are only rvalues.

> > (with a special rule about how the identifier is interpreted, different
> > from the normal scope rules)?  If so, then ".a = 1" could either match
> > assignment-expression directly (assigning to the postfix-expression ".a").
> 
> No, assigning to a function parameter from within another parameter
> declaration wouldn't make sense.  They should be readonly.  Side effects
> should be forbidden, I think.

Such assignments are already allowed.  In a function definition, the side 
effects (including in size expressions for array parameters adjusted to 
pointers) take place before entry to the function body.

And, in any case, if you did have a constraint disallowing such 
assignments, it wouldn't suffice for syntactic disambiguation (see the 
previous point I made about that; I have some rough notes towards a WG14 
paper on syntactic disambiguation, but haven't converted them into a 
coherent paper).

-- 
Joseph S. Myers
joseph@codesourcery.com

  parent reply	other threads:[~2022-11-12 14:54 UTC|newest]

Thread overview: 69+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20220826210710.35237-1-alx.manpages@gmail.com>
     [not found] ` <Ywn7jMtB5ppSW0PB@asta-kit.de>
     [not found]   ` <89d79095-d1cd-ab2b-00e4-caa31126751e@gmail.com>
     [not found]     ` <YwoXTGD8ljB8Gg6s@asta-kit.de>
     [not found]       ` <e29de088-ae10-bbc8-0bfd-90bbb63aaf06@gmail.com>
     [not found]         ` <5ba53bad-019e-8a94-d61e-85b2f13223a9@gmail.com>
     [not found]           ` <CACqA6+mfaj6Viw+LVOG=nE350gQhCwVKXRzycVru5Oi4EJzgTg@mail.gmail.com>
     [not found]             ` <491a930d-47eb-7c86-c0c4-25eef4ac0be0@gmail.com>
2022-09-02 21:57               ` Alejandro Colomar
2022-09-03 12:47                 ` Martin Uecker
2022-09-03 13:29                   ` Ingo Schwarze
2022-09-03 15:08                     ` Alejandro Colomar
2022-09-03 13:41                   ` Alejandro Colomar
2022-09-03 14:35                     ` Martin Uecker
2022-09-03 14:59                       ` Alejandro Colomar
2022-09-03 15:31                         ` Martin Uecker
2022-09-03 20:02                           ` Alejandro Colomar
2022-09-05 14:31                             ` Alejandro Colomar
2022-11-10  0:06                           ` Alejandro Colomar
2022-11-10  0:09                             ` Alejandro Colomar
2022-11-10  1:33                             ` Joseph Myers
2022-11-10  1:39                               ` Joseph Myers
2022-11-10  6:21                                 ` Martin Uecker
2022-11-10 10:09                                   ` Alejandro Colomar
2022-11-10 23:19                                   ` Joseph Myers
2022-11-10 23:28                                     ` Alejandro Colomar
2022-11-11 19:52                                     ` Martin Uecker
2022-11-12  1:09                                       ` Joseph Myers
2022-11-12  7:24                                         ` Martin Uecker
2022-11-12 12:34                                     ` Alejandro Colomar
2022-11-12 12:46                                       ` Alejandro Colomar
2022-11-12 13:03                                       ` Joseph Myers
2022-11-12 13:40                                         ` Alejandro Colomar
2022-11-12 13:58                                           ` Alejandro Colomar
2022-11-12 14:54                                           ` Joseph Myers [this message]
2022-11-12 15:35                                             ` Alejandro Colomar
2022-11-12 17:02                                               ` Joseph Myers
2022-11-12 17:08                                                 ` Alejandro Colomar
2022-11-12 15:56                                             ` Martin Uecker
2022-11-13 13:19                                               ` Alejandro Colomar
2022-11-13 13:33                                                 ` Alejandro Colomar
2022-11-13 14:02                                                   ` Alejandro Colomar
2022-11-13 14:58                                                     ` Martin Uecker
2022-11-13 15:15                                                       ` Alejandro Colomar
2022-11-13 15:32                                                         ` Martin Uecker
2022-11-13 16:25                                                           ` Alejandro Colomar
2022-11-13 16:28                                                         ` Alejandro Colomar
2022-11-13 16:31                                                           ` Alejandro Colomar
2022-11-13 16:34                                                             ` Alejandro Colomar
2022-11-13 16:56                                                               ` Alejandro Colomar
2022-11-13 19:05                                                                 ` Alejandro Colomar
2022-11-14 18:13                                                           ` Joseph Myers
2022-11-28 22:59                                                             ` Alex Colomar
2022-11-28 23:18                                                       ` Alex Colomar
2022-11-29  0:05                                                         ` Joseph Myers
2022-11-29 14:58                                                         ` Michael Matz
2022-11-29 15:17                                                           ` Uecker, Martin
2022-11-29 15:44                                                             ` Michael Matz
2022-11-29 16:58                                                               ` Uecker, Martin
2022-11-29 17:28                                                                 ` Alex Colomar
2022-11-29 16:49                                                           ` Joseph Myers
2022-11-29 16:53                                                             ` Jonathan Wakely
2022-11-29 17:00                                                               ` Martin Uecker
2022-11-29 17:19                                                                 ` Alex Colomar
2022-11-29 17:29                                                                   ` Alex Colomar
2022-12-03 21:03                                                                     ` Alejandro Colomar
2022-12-03 21:13                                                                       ` Andrew Pinski
2022-12-03 21:15                                                                       ` Martin Uecker
2022-12-03 21:18                                                                         ` Alejandro Colomar
2022-12-06  2:08                                                                       ` Joseph Myers
2022-11-14 17:52                                                 ` Joseph Myers
2022-11-14 17:57                                                   ` Alejandro Colomar
2022-11-14 18:26                                                     ` Joseph Myers
2022-11-28 23:02                                                       ` Alex Colomar
2022-11-10  9:40                             ` G. Branden Robinson
2022-11-10 10:59                               ` Alejandro Colomar
2022-11-10 22:25                                 ` G. Branden Robinson

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