llvm dev - Jul 2015 - [LLVMdev] LLVM parsers for popular languages? - Python, Rust, Go

IIRC when LLVM came out a bunch of community-contributed parsers were
available on your website.

Essentially I want to read in a programming language, prune the AST until
it contains only what I define as a "summary", then convert that AST
to
that of another language, before finally outputting [code-generating] a
compilable/interpretable source [think boilerplate].

Would be good to have Python, Rust and Go.

Are there any LLVM parsers around for these popular languages? - I can
write my own, but then I'd need to maintain them against the latest
language specs >.<

Thanks for all suggestions
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Typically, the AST is language-specific [as concepts in one language often
doesn't exist at all in another language, e.g. Python List and Dictionaries
don't exist in C], so outputting it as "another language" is not
always
easy (or even possible without much infrastructure in the target language).

I also have absolutely no idea what you mean by "Summary" - I expect
you
mean the essential parts of the code, minus error checking and such, but I
have a hard time understanding how you differentiate between the
algorithm's essential parts, and "unnecessary error checks"
[unless your
code understands the algorithm, but then you could just as well write a
program that outputs various algorithms in different languages, which would
be easier than taking in source in one language and output it in another
language].

--
Mats

On 30 June 2015 at 02:52, Alec Taylor <alec.taylor6 at gmail.com> wrote:
> IIRC when LLVM came out a bunch of community-contributed parsers were
> available on your website.
>
> Essentially I want to read in a programming language, prune the AST until
> it contains only what I define as a "summary", then convert that
AST to
> that of another language, before finally outputting [code-generating] a
> compilable/interpretable source [think boilerplate].
>
> Would be good to have Python, Rust and Go.
>
> Are there any LLVM parsers around for these popular languages? - I can
> write my own, but then I'd need to maintain them against the latest
> language specs >.<
>
> Thanks for all suggestions
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
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Hi,

Alec Taylor <alec.taylor6 <at> gmail.com>
writes:
> 
> Would be good to have Python, Rust and Go.Are there any LLVM parsers
> around for these popular languages?
A programming language is much more than a parser and AST.  It has
specific semantics, and a runtime (in the case of Python, the runtime is
very large as it hosts a lot of functionality).

So it wouldn't make much sense to have "just a parser".

However, if you are looking for an implementation of a subset of Python
using LLVM, you can take a look at Numba: http://numba.pydata.org/

(disclaimer: I am part of the Numba team)

Regards

Antoine.

Thanks, happy to of confirmed.

With that in mind, will use the AST modules provided by the languages (with
the exception of libclang for C++).

Antoine: Am aware of Numba, nice job there BTW. So is there a [decoupled]
LLVM parser which I can use to read Python files and analyse objects
(including computing their attributes in OO and setattr scenarios)?

On Wed, Jul 1, 2015 at 10:23 PM, Antoine Pitrou <antoine at python.org>
wrote:
>
> Hi,
>
> Alec Taylor <alec.taylor6 <at> gmail.com> writes:
> >
> > Would be good to have Python, Rust and Go.Are there any LLVM parsers
> > around for these popular languages?
>
> A programming language is much more than a parser and AST.  It has
> specific semantics, and a runtime (in the case of Python, the runtime is
> very large as it hosts a lot of functionality).
>
> So it wouldn't make much sense to have "just a parser".
>
> However, if you are looking for an implementation of a subset of Python
> using LLVM, you can take a look at Numba: http://numba.pydata.org/
>
> (disclaimer: I am part of the Numba team)
>
> Regards
>
> Antoine.
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
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