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From: Andrew Haley <aph@redhat.com>
To: libffi-discuss@sourceware.org
Subject: Re: How to call 'printf' using libffi?
Date: Fri, 19 Mar 2021 10:13:34 +0000	[thread overview]
Message-ID: <7c8729d8-d10e-cdb8-5518-e2f82ccbe141@redhat.com> (raw)
In-Reply-To: <CACxje5-Us3WkCtDZwOzWik7PL_YK0LU7tf6_X+tW5R5mQiPK1A@mail.gmail.com>

On 3/18/21 3:25 PM, Anthony Green wrote:
>   arg_types[0] = &ffi_type_pointer;
>   arg_types[1] = &ffi_type_double;
>   arg_types[2] = &ffi_type_sint;
>   arg_types[3] = NULL;
> 
>   /* This printf call is variadic */
>   ffi_prep_cif_var(&cif, FFI_DEFAULT_ABI, 1, 3, &ffi_type_sint, arg_types);

Surely that only works if a varargs call uses the same ABI as a normal
call. They don't always,

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671


  parent reply	other threads:[~2021-03-19 10:13 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-18 14:04 ShaJunxing
2021-03-18 15:25 ` Anthony Green
2021-03-19  2:08   ` ShaJunxing
2021-03-19  2:36     ` Kaz Kylheku (libffi)
2021-03-19  3:09       ` ShaJunxing
2021-03-19 10:13   ` Andrew Haley [this message]
2021-03-19 11:01     ` Anthony Green
2021-03-19 11:43       ` Andrew Haley
2021-03-20 22:40         ` Anthony Green
2021-03-20 23:56           ` Anthony Green
2021-03-22 10:36             ` Andrew Haley
2021-03-19 11:26     ` Jarkko Hietaniemi
2021-03-19 11:33       ` Anthony Green

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