llvm dev - Aug 2020 - Organization of LLVM utilities

I was confused by the lack of TableGen backends in the llvm/lib/tablegen
directory until I stumbled upon the llvm/utils/tablegen directory. Could someone
explain why TableGen is divided into these two directories?

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Windfall               Paul C. Anagnostopoulos 
      ----------------------------------------------------------
   Software            978 369-0839
                             www.windfall.com
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some of which actually happened.
---Mark Twain 

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On 8/4/20 7:31 PM, Paul C. Anagnostopoulos via llvm-dev
wrote:
> I was confused by the lack of TableGen backends in the llvm/lib/tablegen
directory until I stumbled upon the llvm/utils/tablegen directory. Could someone
explain why TableGen is divided into these two directories?
> _________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
I am assuming the TableGen code is split like this so that external 
tools can utilize the TableGen parser without all of the specific logic 
in the LLVM tablegen binary. I can't find any application that uses it 
though aside from tablegen proper.

> On Aug 4, 2020, at 14:31, Paul C. Anagnostopoulos via llvm-dev <llvm-dev
at lists.llvm.org> wrote:
> 
> I was confused by the lack of TableGen backends in the llvm/lib/tablegen
directory until I stumbled upon the llvm/utils/tablegen directory. Could someone
explain why TableGen is divided into these two directories?

Lib is for the core implementation of the language. The different features in
utils are the different backends that all interpret it in different ways.

-Matt
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There is also clang/utils/TableGen which contains the clang tablegen
backends.The build produces an llvm-tblgen from llvm/utils/TableGen and
clang-tblgen from clang/utils/TableGen

~Craig


On Tue, Aug 4, 2020 at 11:41 AM Charlotte Delenk via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
>
> On 8/4/20 7:31 PM, Paul C. Anagnostopoulos via llvm-dev wrote:
> > I was confused by the lack of TableGen backends in the
llvm/lib/tablegen
> directory until I stumbled upon the llvm/utils/tablegen directory. Could
> someone explain why TableGen is divided into these two directories?
> > _________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> I am assuming the TableGen code is split like this so that external
> tools can utilize the TableGen parser without all of the specific logic
> in the LLVM tablegen binary. I can't find any application that uses it
> though aside from tablegen proper.
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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> On Aug 4, 2020, at 11:31 AM, Paul C. Anagnostopoulos via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> 
> I was confused by the lack of TableGen backends in the llvm/lib/tablegen
directory until I stumbled upon the llvm/utils/tablegen directory. Could someone
explain why TableGen is divided into these two directories?
The mechanical reason is that llvm/utils builds before llvm/libs.  The basic
TableGen support is required to generate .inc files in the libs directory.

-Chris

Could you expand on this a bit? I see from my build directory that
llvm-tblgen.exe was built before the Target/* .inc files. It sounds like
you're saying that something has to be built between the .exe and the .inc
files.

At 8/4/2020 02:44 PM, Chris Lattner wrote:

>> On Aug 4, 2020, at 11:31 AM, Paul C. Anagnostopoulos via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>> 
>> I was confused by the lack of TableGen backends in the
llvm/lib/tablegen directory until I stumbled upon the llvm/utils/tablegen
directory. Could someone explain why TableGen is divided into these two
directories?
>
>The mechanical reason is that llvm/utils builds before llvm/libs.  The basic
TableGen support is required to generate .inc files in the libs directory.
>
>-Chris

----------------------------------------------------------------
Windfall               Paul C. Anagnostopoulos 
      ----------------------------------------------------------
   Software            978 369-0839
                             www.windfall.com
----------------------------------------------------------------
My life has been filled with calamities,
some of which actually happened.
---Mark Twain 

Guga 'mzimba, sala 'nhliziyo