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Re: [PATCH 0/6] Convert gimple to a C++ class hierarchy
- From: Diego Novillo <dnovillo at google dot com>
- To: Jakub Jelinek <jakub at redhat dot com>
- Cc: Michael Matz <matz at suse dot de>, Gabriel Dos Reis <gdr at integrable-solutions dot net>, David Malcolm <dmalcolm at redhat dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 30 Aug 2013 11:40:34 -0400
- Subject: Re: [PATCH 0/6] Convert gimple to a C++ class hierarchy
- Authentication-results: sourceware.org; auth=none
- References: <1377793216-22549-1-git-send-email-dmalcolm at redhat dot com> <alpine dot LNX dot 2 dot 00 dot 1308301532490 dot 9949 at wotan dot suse dot de> <CAAiZkiB-Z7GfDGNuWys+d6JW+ynbtfC_Yc5YHfN9M-to5uABXg at mail dot gmail dot com> <20130830140253 dot GO21876 at tucnak dot zalov dot cz> <CAAiZkiB=iJ7dwFEe7OKhMBXccMsu6950fE6Cy=h-a6JF0h=FTA at mail dot gmail dot com> <alpine dot LNX dot 2 dot 00 dot 1308301712450 dot 9949 at wotan dot suse dot de> <CAD_=9DRK4htu8jefZehb0Q4JDCozbCA2pr0Sq6rhX4JcW7QEDw at mail dot gmail dot com> <20130830153727 dot GQ21876 at tucnak dot zalov dot cz>
On Fri, Aug 30, 2013 at 11:37 AM, Jakub Jelinek <jakub@redhat.com> wrote:
> Teaching the gengtype parser about
> {struct,class} name : public {struct,class} someothername { ... }
> as opposed to current
> {struct,class} name { ... }
> shouldn't be that hard. And, if the complaint is that we'd need to write
> whole C++ parser for it, then the response could be that we already have
> one C++ parser (and, even have plugin support and/or emit dwarf etc.).
It isn't. It's annoying and a duplication of effort.
> So, gengtype could very well use a g++ plugin to emit the stuff it needs,
> or parse DWARF, etc. And, we even could not require everybody actually
> emitting those themselves, we could check some text form of that
> (gengtype.state?) into the tree, so only people actually changing the
> compiler would need to run the plugin.
Yes. Lawrence and I thought about moving gengtype inside g++. That
seemed like a promising approach.
> Even if you have some stuff that helps you writing those, still it will be a
> big source of bugs (very hard to debug) and a maintainance nightmare.
Debugging gengtype is much harder. It is magic code that is not visible.
Diego.