From: Basile Starynkevitch <basile@starynkevitch.net>
To: gcc@gcc.gnu.org
Cc: Marc Glisse <marc.glisse@inria.fr>
Subject: Re: adding destroyable objects into Ggc
Date: Fri, 21 Oct 2011 09:03:00 -0000 [thread overview]
Message-ID: <20111021080914.08528e83f5eb53897d92fee9@starynkevitch.net> (raw)
In-Reply-To: <alpine.DEB.2.02.1110201708080.2378@laptop-mg.saclay.inria.fr>
On Thu, 20 Oct 2011 17:13:46 +0200 (CEST)
Marc Glisse <marc.glisse@inria.fr> wrote:
> Can't you use GTY-ed memory in PPL? Sorry for the naive question, but
> std::vector can take an allocator parameter, gmp lets you specify an
> allocation function...
I believe that the PPL C++ code don't have any kind of allocator parameters.
But I am not sure it would help. Let's take just a std::string allocated with an
allocator that would use Ggc-ed memory, and appearing inside a GTY-ed data.
How that Ggc-ed memory used for the string will be marked, and how will it be released?
The usual way to release memory allocated by Ggc is inside ggc_collect (e.g. by
sweep_pages) and that happens when the object has not been marked (because Ggc is a
precise mark&sweep collector).
And because C++ collections don't offer (AFAIK) any support to scan all their internal
data (so if std::string implementation actually contains a pointer to some internal
buffer which would have been Ggc-allocated because the string has been created using
our putative Ggc C++ allocator) it seems to me that the only way to make it work is to
have the C++ destructor of our std::string called from inside Ggc. This is what I call
finalized objects (or destroyable objects) inside Ggc.
Or did I not understood something about your question?
Cheers
--
Basile STARYNKEVITCH http://starynkevitch.net/Basile/
email: basile<at>starynkevitch<dot>net mobile: +33 6 8501 2359
8, rue de la Faiencerie, 92340 Bourg La Reine, France
*** opinions {are only mine, sont seulement les miennes} ***
next prev parent reply other threads:[~2011-10-21 6:09 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-18 16:35 Basile Starynkevitch
2011-10-18 16:43 ` Duncan Sands
2011-10-18 16:53 ` Basile Starynkevitch
2011-10-18 17:11 ` Ian Lance Taylor
2011-10-18 17:14 ` Gabriel Dos Reis
2011-10-18 17:20 ` Basile Starynkevitch
2011-10-18 17:36 ` Ian Lance Taylor
2011-10-18 17:41 ` Basile Starynkevitch
2011-10-18 17:50 ` Ian Lance Taylor
2011-10-18 17:53 ` Basile Starynkevitch
2011-10-18 18:03 ` Jonathan Wakely
2011-10-18 18:11 ` Ian Lance Taylor
2011-10-18 19:41 ` Basile Starynkevitch
2011-10-18 20:52 ` Gabriel Dos Reis
2011-10-18 19:50 ` Gabriel Dos Reis
2011-10-18 23:11 ` Basile Starynkevitch
2011-10-19 0:49 ` Jonathan Wakely
2011-10-18 19:46 ` Gabriel Dos Reis
2011-10-19 6:04 ` Chiheng Xu
2011-10-19 6:08 ` Basile Starynkevitch
2011-10-19 6:43 ` Chiheng Xu
2011-10-19 6:12 ` Gabriel Dos Reis
2011-10-19 6:17 ` Basile Starynkevitch
2011-10-19 6:22 ` Chiheng Xu
[not found] ` <20111019080021.4e1acb3687fc8ceacc2fd7a3@starynkevitch.net>
[not found] ` <CAAiZkiB-aXfE8MyY_S6YvecdxgsBnuBHp3JDWx4kirVkQx8w+A@mail.gmail.com>
2011-10-19 7:41 ` Gabriel Dos Reis
2011-10-19 7:43 ` Basile Starynkevitch
2011-10-19 12:14 ` Gabriel Dos Reis
2011-10-19 13:31 ` Duncan Sands
2011-10-19 22:19 ` Jonathan Wakely
2011-10-19 15:06 ` David Malcolm
2011-10-20 6:03 ` Lawrence Crowl
2011-10-20 8:29 ` Basile Starynkevitch
2011-10-20 8:37 ` Marc Glisse
2011-10-20 8:38 ` Basile Starynkevitch
2011-10-20 11:57 ` Marc Glisse
2011-10-20 12:10 ` Basile Starynkevitch
2011-10-20 15:34 ` Marc Glisse
2011-10-21 9:03 ` Basile Starynkevitch [this message]
2011-10-21 12:24 ` Marc Glisse
2011-10-21 12:28 ` Richard Guenther
2011-10-21 23:53 ` Basile Starynkevitch
2011-10-22 1:31 ` Gabriel Dos Reis
2011-10-22 11:20 ` Basile Starynkevitch
2011-10-23 13:50 ` Richard Guenther
2011-10-19 15:56 ` Laurynas Biveinis
2011-10-19 16:54 ` Basile Starynkevitch
2011-10-20 8:52 ` Laurynas Biveinis
2011-10-20 12:27 ` Basile Starynkevitch
2011-10-20 12:51 ` Andrew Haley
2011-10-20 14:07 ` Basile Starynkevitch
2011-10-20 13:10 ` Duncan Sands
2011-10-20 14:52 ` Torvald Riegel
2011-10-20 15:14 ` Jonathan Wakely
2011-10-20 15:26 ` Richard Guenther
2011-10-20 17:23 ` Basile Starynkevitch
2011-10-20 18:38 ` Jonathan Wakely
2011-10-18 18:39 ` Jonathan Wakely
2011-10-18 18:48 ` Basile Starynkevitch
2011-10-18 19:42 ` Jonathan Wakely
2011-10-18 19:45 ` Basile Starynkevitch
2011-10-18 22:43 ` Gabriel Dos Reis
2011-10-18 21:24 ` Gabriel Dos Reis
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