From: Jarkko Hietaniemi <jhi@iki.fi>
To: Andrew Haley <aph@redhat.com>, libffi-discuss@sourceware.org
Subject: Re: How to call 'printf' using libffi?
Date: Fri, 19 Mar 2021 13:26:48 +0200 [thread overview]
Message-ID: <fdf82738-c452-dc46-b725-256358eaee3f@iki.fi> (raw)
In-Reply-To: <7c8729d8-d10e-cdb8-5518-e2f82ccbe141@redhat.com>
Andrew Haley via Libffi-discuss wrote:
> 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,
>
Yeah, it's a mess, e.g.
https://www.quora.com/How-are-varargs-typically-implemented-in-C-under-the-hood
next prev parent reply other threads:[~2021-03-19 11:26 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
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 [this message]
2021-03-19 11:33 ` Anthony Green
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