llvm dev - Feb 2017 - Help needed to define and handle custom pragma #mypragma

Hi,

I want to allow compilation of my own pragma in C/Cpp files such as
#pragma mypragma and I want to handle it in this way -- upon identification
of this pragma, I want to insert a function call and delete some code in
the original source file.

My problem is defining pragma and to handle it for inserting a function
call. It would be great if someone can guide or suggest some tutorials. I
am referring following resources but being newbie in front-end parsing, it
is little hard. So, any help is highly appreciated. Thank you! :)

Resources that I am following are --
http://wvanteijlingen.github.io/notes/clang_pragmas
http://llvm.org/devmtg/2013-04/pellegrini-slides.pdf

Best,
*Shail*
ᐧ
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On Thu, Feb 16, 2017 at 08:48:02PM -0700, Shail Dave via llvm-dev
wrote:
> Hi,
> 
> I want to allow compilation of my own pragma in C/Cpp files such as
> #pragma mypragma and I want to handle it in this way -- upon identification
> of this pragma, I want to insert a function call and delete some code in
> the original source file.
> 
> My problem is defining pragma and to handle it for inserting a function
> call. It would be great if someone can guide or suggest some tutorials. I
> am referring following resources but being newbie in front-end parsing, it
> is little hard. So, any help is highly appreciated. Thank you! :)
> 
> Resources that I am following are --
> http://wvanteijlingen.github.io/notes/clang_pragmas
> http://llvm.org/devmtg/2013-04/pellegrini-slides.pdf
> 
> Best,
> *Shail*
I choke upon the same issue a while ago and detailed my walk through
here :

http://blog.quarkslab.com/implementing-a-custom-directive-handler-in-clang.html

hope it helps,

Serge