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From: Oleg Nesterov <oleg@redhat.com>
To: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Cc: Alexey Gladkov <gladkov.alexey@gmail.com>, linux-sparse@vger.kernel.org
Subject: Re: [PATCH] dissect: add support for _Generic
Date: Thu, 30 Jul 2020 17:08:37 +0200
Message-ID: <20200730150837.GA6956@redhat.com> (raw)
In-Reply-To: <20200729145025.g26jqfpqcnhd5wed@ltop.local>

On 07/29, Luc Van Oostenryck wrote:
>
> > +	break; case EXPR_GENERIC: {
> > +		struct type_expression *map;
> > +
> > +		do_expression(U_VOID, expr->control);
> > +
> > +		for (map = expr->map; map; map = map->next)
> > +			ret = do_expression(mode, map->expr);
> > +		if (expr->def)
> > +			ret = do_expression(mode, expr->def);
> > +	}
> > +
> >  	break; case EXPR_SYMBOL:
> >  		ret = report_symbol(mode, expr);
> >  	}
>
> Yes, that should do the 'walking'.

OK, I am sending this stupid patch. Better than nothing.

> The returned type will just be
> quite arbitrary, but I don't know how much it matters.

Of course. And this is not good. For example:

	void func(void)
	{
		struct B *b; struct C *c; struct D *d;
		_Generic(a,
			int:		b,
			void*:		c,
			default:	d
		) ->mem++;
	}

output:

   1:6                    def   f func                             void ( ... )
   3:18  func             def . v b                                struct B *
   3:31  func             def . v c                                struct C *
   3:44  func             def . v d                                struct D *
   4:18  func             ---   v a                                bad type
   5:33  func             --m . v b                                struct B *
   6:33  func             --m . v c                                struct C *
   7:33  func             --m . v d                                struct D *
   8:11  func             -m-   m D.mem                            bad type

But I do not know how to improve it without serious complications, and
(so far) I think it doesn't worth the effort.

Oleg.


  reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-28 18:35 Alexey Gladkov
2020-07-28 19:49 ` Oleg Nesterov
2020-07-28 23:10   ` Luc Van Oostenryck
2020-07-29 11:28     ` Oleg Nesterov
2020-07-29 14:50       ` Luc Van Oostenryck
2020-07-30 15:08         ` Oleg Nesterov [this message]
2020-07-30 20:00           ` Luc Van Oostenryck
2020-07-31 14:43             ` Oleg Nesterov
2020-07-31 16:13               ` Luc Van Oostenryck
2020-07-30 15:09     ` [PATCH] dissect: support _Generic() a bit more Oleg Nesterov
2020-07-30 20:05       ` Luc Van Oostenryck

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