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Re: using C++ STL containers in GCC/gfortran source code
- From: Pedro Alves <palves at redhat dot com>
- To: Janus Weil <janus at gcc dot gnu dot org>, "N.M. Maclaren" <nmm1 at cam dot ac dot uk>
- Cc: gcc mailing list <gcc at gcc dot gnu dot org>, gfortran <fortran at gcc dot gnu dot org>, Jakub Jelinek <jakub at redhat dot com>
- Date: Fri, 16 Dec 2016 17:53:10 +0000
- Subject: Re: using C++ STL containers in GCC/gfortran source code
- Authentication-results: sourceware.org; auth=none
- References: <CAKwh3qgUN=mTFPg6Ew6Yk9RXgS3CttE7O3cGMQRcLKNqUOjBng@mail.gmail.com> <Prayer.1.3.5.1612161716380.29840@hermes-2.csi.cam.ac.uk> <CAKwh3qhj-y5U9RrJ+nP45fGjRL2JbEKGKcVw4nsXMp-=h8jq-Q@mail.gmail.com>
On 12/16/2016 05:33 PM, Janus Weil wrote:
> "You would need to make sure it uses a xmalloc based allocator first
> or at least calls xmalloc_failed upon allocation failure, otherwise it
> will be a serious regression."
>
> I'm really not an expert on GCC's memory management principles and how
> it uses xmalloc over malloc. I'd love to hear further comments on the
> above sentence (e.g. whether that is really necessary, and if yes, how
> to accomplish it).
I gave a suggestion in the PR.
Basically, you can replace the global operator new to call xmalloc
instead of malloc. See the GDB url in the PR for an example.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78822#c19
> And in particular: How do the current uses of
> std::string in GCC deal with this problem? (Do they?)
Doesn't look like they do.
Thanks,
Pedro Alves