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From: Erik de Castro Lopo <mle+ocaml@mega-nerd.com>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Val_int vs caml_copy_nativeint
Date: Wed, 10 Aug 2011 08:53:57 +1000	[thread overview]
Message-ID: <20110810085357.73059efd1f39ef2e9466ccd3@mega-nerd.com> (raw)
In-Reply-To: <20110809113359.c306a95842c0c86ea160025d@mega-nerd.com>

Erik de Castro Lopo wrote:

> This is strange, it wasn't declared with a CAMLlocal macro and it
> was working, but if I do declare it with one the program segfaults
> during garbage collection (caml_oldify_local_roots).

Ok, with the help of someone off list I've sorted this out to
my satisfaction. Things learned:

 a) In the C stub function, the call to CAMLParamN must be the
    first thing in the function, followed by any CAMLlocalN
    declarations. These should even occur before before any 
    declarations of local C variables.

 b) caml_copy_nativeint creates a boxed native int (either Int32.t
    or Int64.t) not an unboxed Ocaml int. To create an unboxed
    Ocaml int, Val_int() is the correct macro.

Thanks to all that responded.

Erik
-- 
----------------------------------------------------------------------
Erik de Castro Lopo
http://www.mega-nerd.com/

  parent reply	other threads:[~2011-08-09 22:54 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-08  3:15 Erik de Castro Lopo
2011-08-08  3:48 ` Romain Beauxis
2011-08-08  3:59   ` Guillaume Yziquel
2011-08-08  7:49     ` Erik de Castro Lopo
2011-08-08  3:53 ` Guillaume Yziquel
2011-08-08  7:46   ` Erik de Castro Lopo
2011-08-08  8:03     ` Guillaume Yziquel
2011-08-08  9:17       ` Mathias Kende
2011-08-08 17:24       ` Xavier Leroy
2011-08-09  1:33         ` Erik de Castro Lopo
2011-08-09  1:40           ` Romain Beauxis
2011-08-09  8:44           ` David Allsopp
2011-08-09 10:07             ` malc
2011-08-09 10:43               ` David Allsopp
2011-08-09 22:53           ` Erik de Castro Lopo [this message]
2011-08-10  6:43             ` Gabriel Scherer
2011-08-08  5:20 ` malc
2011-08-08  6:01   ` Guillaume Yziquel
2011-08-08  6:22     ` malc

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