[cfe-dev] Support a new C-like language by libclang?

[Reid Kleckner]

If you just want C and not C++ or other language extensions, then I think
writing your own C frontend IR is probably easier than reusing Clang's. All
the complexity in Clang comes from C++, really, and the frontend isn't
designed to be pluggable like the optimizer is.

On Wed, Jan 7, 2015 at 5:36 PM, Jovi Zhangwei <jovi.zhangwei at gmail.com>
wrote:

> Hi,
>
> On Wed, Jan 7, 2015 at 4:55 PM, mats petersson <mats at planetcatfish.com>
> wrote:
> > And you want to DO what, exactly with it, after you have parsed it?
> >
> > And does your script use ALL of C's functionality?
> >
>
> Some functions will be compiled to bpf bytecode and inject into
> kernel(run in kernel), some functions
> in one script will be compiled to x86_64 instruction which run in
> userspace.
>
> (There have one project called ktap, www.ktap.org, mainly purpose for
> kernel dynamic tracing, probably you knows systemtap,
>  ktap is similar like systemtap. There will have a bpf backend for
> llvm, now I'm just think how to integrating ktap and bpf)
>
> Some basic requirement of this new frontend is:
> 1). support new keywords, like trace, trace_end, argstr.
> 2). support table syntax, also multiple key table. C language don't
> support table syntax at all.
> 3). data structure info retrieve from debuginfo(like vmlinux), not
> defined in script or header file.
>
> Do you think my design can achieve by change some part of clang(lex,
> etc) and reuse rest library of clang? or have better solution?
>
> Thank you.
>
> > --
> > Mats
> >
> > On 7 January 2015 at 23:58, Jovi Zhangwei <jovi.zhangwei at gmail.com>
> wrote:
> >> Hi,
> >>
> >> On Tue, Jan 6, 2015 at 4:16 PM, Nikola Smiljanic <popizdeh at gmail.com>
> wrote:
> >>> Yes, you'd have to modify clang to lex/parse/sema your
> >>> keywords/extensions/whatever.
> >>>
> >>
> >> Is there have a simple solution without change to much on clang?
> >>
> >> In my case, I want to parse script which have custom language based on
> >> C. The script just like below:
> >>
> >> trace syscalls:*
> >> {
> >>     print(argstr);
> >> }
> >>
> >> Actually there just have few new keywords(like trace, trace_end) in
> >> this new language, all others in C.
> >>
> >> Any guide on this?
> >>
> >> Thank you.
> >>
> >>> On Wed, Jan 7, 2015 at 10:15 AM, Jovi Zhangwei <
> jovi.zhangwei at gmail.com>
> >>> wrote:
> >>>>
> >>>> Hi,
> >>>>
> >>>> I'm new to clang world, here I have one question about libclang or
> >>>> libtooling, I would be very appreciate if anyone can help me.
> >>>>
> >>>> Currently I want to develop a new language, which is C like, just
> some new
> >>>> syntax sugars on top of C language, I can modify clang lexer code to
> make
> >>>> that, or I can use translator, but if this requirement can be done by
> >>>> libclang or libtooling, that's perfect simple for me.
> >>>>
> >>>> My direct impression is there have no way to change language syntax by
> >>>> libclang/libtooling, libclang/libtooling only can parse and analysis
> on C
> >>>> family language, no chance to support other language by library, is
> this
> >>>> correct?
> >>>>
> >>>> Thank you.
> >>>>
> >>>> Jovi
> >>>>
> >>>> _______________________________________________
> >>>> cfe-dev mailing list
> >>>> cfe-dev at cs.uiuc.edu
> >>>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
> >>>>
> >>>
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