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Re: How could I cast the return type of a function created by gimple_build_call?
- From: Martin Jambor <mjambor at suse dot cz>
- To: Feng LI <nemokingdom at gmail dot com>
- Cc: GCC <gcc at gcc dot gnu dot org>
- Date: Thu, 8 Dec 2011 13:26:59 +0100
- Subject: Re: How could I cast the return type of a function created by gimple_build_call?
- References: <CAPekQOpAhLqUyfo=zhgwAfi8SDjoNJ_N1p-ZfNhipFs+Axvk+w@mail.gmail.com>
Hi,
On Thu, Dec 08, 2011 at 10:38:24AM +0100, Feng LI wrote:
> Hi,
>
> I'm building a function with
> fread = build_decl (LOCATION, FUNCTION_DECL, get_identifier (name), type);
>
> and then use it in gimple with
> gimple gfread = gimple_build_call (fread, 1, offset);
> gimple_call_set_lhs (fread, lhs);
>
> But I need a cast here, since the lhs has a different type than the return value
> of the function fread. So I suppose that I need a cast here to cast from the
> return type of fread -> type_of (lhs). But I've no idea how could I
> achieve this?
> Any suggestions?
You need to store the result into a temporary and then add a
VIEW_CONVERT_EXPR gimple assignment statement after the statement to
convert to the necessary type. Grep *.c files for
'build.*VIEW_CONVERT_EXPR' and you should be able to find some example
to follow in your own code.
Martin