From: Andreas Schwab <schwab@linux-m68k.org>
To: DJ Delorie <dj@redhat.com>
Cc: alx@kernel.org, libc-alpha@sourceware.org
Subject: Re: free(3) const void *
Date: Fri, 26 Jan 2024 23:07:50 +0100 [thread overview]
Message-ID: <87y1cb3g09.fsf@igel.home> (raw)
In-Reply-To: <xnle8bsr5x.fsf@greed.delorie.com> (DJ Delorie's message of "Fri, 26 Jan 2024 16:47:38 -0500")
On Jan 26 2024, DJ Delorie wrote:
> Andreas Schwab <schwab@linux-m68k.org> writes:
>> Also, objects in the heap are never read-only.
>
> I thought of that, but using "const" in a program can mean something
> other than "the object is read-only".
Right, that is the difference between const-qualified and read-only.
> It can also act as a promise to the user and/or optimizer that an
> object is not written to, even if doing such is possible.
Unfortunately, the C standard does not support that promise. Only
static or automatic objects can be truely read-only.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
next prev parent reply other threads:[~2024-01-26 22:07 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-26 13:21 Alejandro Colomar
2024-01-26 14:24 ` Arsen Arsenović
2024-01-26 15:35 ` Alejandro Colomar
2024-01-26 17:22 ` Arsen Arsenović
2024-01-26 17:55 ` Xi Ruoyao
2024-01-26 18:11 ` Alejandro Colomar
2024-01-26 20:04 ` Arsen Arsenović
2024-01-26 20:07 ` Arsen Arsenović
2024-01-26 17:40 ` Andreas Schwab
2024-01-26 19:45 ` Florian Weimer
2024-01-26 15:13 ` Andreas Schwab
2024-01-26 15:33 ` Alejandro Colomar
2024-01-26 18:09 ` Russ Allbery
2024-01-26 18:23 ` Alejandro Colomar
2024-01-26 18:36 ` Xi Ruoyao
2024-01-26 18:40 ` Alejandro Colomar
2024-01-26 18:49 ` Xi Ruoyao
2024-01-26 18:57 ` Alejandro Colomar
2024-01-26 18:40 ` Russ Allbery
2024-01-26 18:45 ` Alejandro Colomar
2024-01-26 19:41 ` Florian Weimer
2024-01-26 18:39 ` [PATCH] Use [[gnu::access(none)]] on free(3) Alejandro Colomar
2024-01-26 18:41 ` Alejandro Colomar
2024-01-26 21:23 ` Paul Eggert
2024-01-26 23:19 ` Alejandro Colomar
2024-01-27 13:21 ` Cristian Rodríguez
2024-02-13 15:19 ` Gabriel Ravier
2024-02-13 15:28 ` Alejandro Colomar
2024-01-26 21:11 ` free(3) const void * DJ Delorie
2024-01-26 21:30 ` Andreas Schwab
2024-01-26 21:47 ` DJ Delorie
2024-01-26 22:07 ` Andreas Schwab [this message]
2024-01-26 23:25 ` Alejandro Colomar
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