From: Mauricio Fernandez <mfp@acm.org>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Interfacing with C: bad practice
Date: Tue, 16 Aug 2011 12:39:29 +0200 [thread overview]
Message-ID: <20110816103929.GB3772@NANA.localdomain> (raw)
In-Reply-To: <CAMT7qiQUam7ihRDGYyERoh+P1sSK+WLhjwAAheaCrCjkZ-9Fjw@mail.gmail.com>
On Tue, Aug 16, 2011 at 01:21:02PM +0400, Dmitry Bely wrote:
> On Tue, Aug 16, 2011 at 12:57 PM, Christophe TROESTLER
> <Christophe.Troestler@umons.ac.be> wrote:
> > On Tue, 16 Aug 2011 11:37:03 +0400, Dmitry Bely wrote:
> >> In the line
> >>
> >> list = wrp_ml_cons(caml_copy_string(*s), list); /* bug! */
> >>
>
> Let me explain again. Before wrp_ml_cons() is called, C compiler
>
> 1. Pushes a _copy_ of list value onto the stack.
> 2. Calls caml_copy_string(*s) and pushes its result onto the stack also.
> 3. Calls wrp_ml_cons().
>
> After (2) the second parameter of wrp_ml_cons() becomes invalid: it is
> a _copy_ of list, not registered as a local root.
This has been in my mind for a while: why don't CAMLparamX declare the local
variables as volatile?
--
Mauricio Fernandez - http://eigenclass.org
next prev parent reply other threads:[~2011-08-16 10:39 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-16 7:37 Dmitry Bely
2011-08-16 8:04 ` Török Edwin
2011-08-16 8:25 ` Dmitry Bely
2011-08-16 8:43 ` Török Edwin
2011-08-16 9:46 ` rixed
2011-08-16 9:53 ` Dmitry Bely
2011-08-16 10:17 ` Török Edwin
2011-08-16 11:04 ` rixed
[not found] ` <20110816.105738.246515733851238101.Christophe.Troestler@umons.ac.be>
2011-08-16 9:21 ` Dmitry Bely
2011-08-16 10:39 ` Mauricio Fernandez [this message]
2011-08-16 14:27 ` John Carr
2011-08-16 12:28 ` [Caml-list] " Dmitry Bely
2011-08-16 15:25 ` [Caml-list] " Richard W.M. Jones
2011-08-16 15:51 ` rixed
2011-08-16 16:00 ` Will M. Farr
2011-08-16 16:10 ` Richard W.M. Jones
2011-08-16 16:17 ` Richard W.M. Jones
2011-08-16 16:18 ` Dmitry Bely
2011-08-16 16:22 ` Richard W.M. Jones
2011-08-16 16:27 ` Richard W.M. Jones
2011-08-16 16:30 ` malc
2011-08-16 16:34 ` Török Edwin
2011-08-16 16:47 ` Richard W.M. Jones
2011-08-16 16:55 ` [Caml-list] " Jeffrey Scofield
2011-08-16 17:08 ` Will M. Farr
2011-08-16 19:46 ` Gerd Stolpmann
2011-08-16 20:18 ` Jeffrey Scofield
2011-08-16 17:08 ` [Caml-list] " rixed
2011-08-16 16:06 ` John Carr
2011-08-16 16:14 ` Wojciech Meyer
2011-08-16 16:13 ` Dmitry Bely
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