From: Dmitry Bely <dmitry.bely@gmail.com>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Compiler bug?
Date: Mon, 6 Aug 2012 14:20:13 +0400 [thread overview]
Message-ID: <CAMT7qiTCnxbAwbPSiXxxm3EBFVyTad98YqxxxveoPkhepKbCkA@mail.gmail.com> (raw)
In-Reply-To: <501F9855.6080709@frisch.fr>
On Mon, Aug 6, 2012 at 2:11 PM, Alain Frisch <alain@frisch.fr> wrote:
> On 08/06/2012 12:04 PM, Dmitry Bely wrote:
>>
>> X parameter is passed as a pointer to float value ([eax] which is
>> immediately saved to [ebx]). But If GC happens (L102), float value can
>> be moved around the OCaml heap and [ebx] become invalid, right? So the
>> generated code is just wrong. Am I missing something?
>
>
> The GC knows about the location of OCaml values, including those stored in
> registers when it is called (the compiler generate tables to retrieve this
> information from the GC call site). These values are used as roots for the
> GC, and they are updated when the value is moved.
I always thought that local roots are memory-based. How GC knows that
in this case [ebx] should be updated? (remember, the parameter was
passed in [eax]) Could you point me to the relevant part of Ocaml
compiler sources?
- Dmitry Bely
next prev parent reply other threads:[~2012-08-06 10:20 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-06 10:04 Dmitry Bely
2012-08-06 10:11 ` Alain Frisch
2012-08-06 10:20 ` Dmitry Bely [this message]
2012-08-06 10:34 ` Alain Frisch
2012-08-06 11:03 ` Dmitry Bely
2012-08-06 11:32 ` Alain Frisch
2012-08-06 12:16 ` Dmitry Bely
2012-08-07 1:35 ` Cedric Cellier
2012-08-08 16:03 ` Dmitry Bely
2012-08-08 18:03 ` Alain Frisch
2012-08-08 18:22 ` Jesper Louis Andersen
2012-08-08 18:40 ` Dmitry Bely
2012-08-08 19:29 ` Fabrice Le Fessant
2012-08-08 23:34 ` Anil Madhavapeddy
2012-08-09 0:53 ` Francois Berenger
-- strict thread matches above, loose matches on Subject: below --
2006-05-17 23:14 compiler bug? Dan Koppel
2006-05-17 23:33 ` [Caml-list] " John Carr
2006-05-18 17:15 ` Xavier Leroy
2006-05-18 17:34 ` Jacques Carette
2006-05-18 17:46 ` Xavier Leroy
2006-05-18 19:31 ` Jacques Carette
2006-05-18 20:07 ` David Brown
2006-05-18 20:15 ` Jacques Carette
2006-05-18 20:20 ` Alain Frisch
2006-05-18 18:19 ` skaller
2006-05-18 18:53 ` Jacques Carette
2006-05-19 1:47 ` skaller
2006-05-19 2:17 ` Brian Hurt
2006-05-19 3:11 ` skaller
2006-05-19 16:48 ` Jacques Carette
2006-05-19 19:10 ` skaller
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