[cfe-dev] CLOMP: OpenMP frontend for Clang (and much more)

Simone Pellegrini spellegrini at dps.uibk.ac.at
Tue May 8 06:11:39 PDT 2012

Dear all,
I worked for some time on an OpenMP frontend based on Clang. This is not 
just an OpenMP frontend but a more comprehensive framework to handle 
user defined pragmas. OpenMP is implemented just to test its 
functionalities. This was implemented as part of a bigger project called 
insieme which is developed at the university of Innsbruck ( 
http://insieme-compiler.org/). Several people asked me to release this 
code since long time and I finally took some time to isolate the pragma 
handling mechanism from the rest of the project and open source it. This 
is only the frontend part, there is no backend. Therefore, if you happen 
to have an OpenMP backend for LLVM and you need a frontend then you just 
found your soul mate :)

I host this code in the following repository: 

This project contains the infrastructure for pragma handling and the 
OpenMP frontend. It doesn't work on the current SVN release on clang. It 
requires LLVM/Clang 3.0 and additionally a small patch has to be applied 
to Clang in order for the all thing to work. However the patch can be 
easily updated to work with the latest clang. The project contains a 
couple of examples that show how it is meant to be used.

In order to compile the project you need to do 2 things. First of all 
install the patched version of LLVM/Clang. This can be done by running 
the llvm-3.0-installer.sh script stored in the script folder. Clomp is 
built with cmake. Specify the LLVM_HOME=/path/to/patched-llvm env 
variable when you run CMAKE. It is required to set up some internal 
paths. (I will add installation instruction in the project web page soon)

It would be nice to have the code in Clang (so that I don't have to 
update the patch every time a new release of clang comes along) but I 
really have no time to rewrite everything to conform with the coding 
style of LLVM. I use C++11 a lot and templates as well and I know LLVM 
how people here feel about those things. :) Also the code was first 
written more than 1 year ago and I suppose in the meantime several 
things have changed in Clang and probably there is an easier way to do 
some of the things. If someone is interested in taking over the effort 
of going through a code review and port it into clang I can help, just 
contact me. The code is well tested and functional. It can handle 
several OpenMP benchmark codes like the NAS Parallel Benchmarks and 
Rodinia benchmarks.

Everyone can use it. If you do so, please cite. I am open to research 

cheers, Simone

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