[cfe-dev] Options for tagging function in source

Jordy Rose jediknil at belkadan.com
Fri May 18 07:04:06 PDT 2012

Hi, Sebastian. I'd suggest using the [[annotate]] attribute, then checking each declaration afterwards to see if it has the tag. That requires no changes to the existing code, just an ASTConsumer in your plugin.

void test(int) __attribute__((annotate("NameOfTag")));


On May 18, 2012, at 9:47, Sebastian Dreßler wrote:

> Hi,
> I'm investigating possible solutions for tagging one or more functions 
> of interest within C / C++ source code. By using clang I'd like to get 
> the name of the tagged function. I "only" have two requirements:
> - Not much more code required for tagging (best case is a one-liner)
> - Implementation should be a clang plugin
> So far there are three ideas how to achieve this:
> 1. Use #pragma tag <NameOfTag>. This would be the preferred solution, 
> but as far as I have seen clang does not support #pragma plugins. Or is 
> this information wrong and plugins for pragmas can be done somewhow?
> 2. Use __attribute__. Here I'm not sure whether, e.g.
>     void foo(args) __attribute__((tag <NameOfTag>))
> is usable within clang, since I wasn't able to implement this for 
> instance by using hasAttr() within a ASTConsumer, the return value is 
> always false.
> 3. Use a label, e.g. tag_<NameOfTag>:. Right now this is the solution 
> I'm using, but here I have to ensure that no one re-uses this label 
> which is rather hard to achieve, although I assume that no one uses 
> labels within C / C++ these days, but you never know.
> So, maybe I'm missing something (or my assumptions are wrong) and it 
> would be nice to get some feedback regarding this.
> Thanks,
> Sebastian
> -- 
> Mit freundlichen Grüßen / Kind regards
> Sebastian Dreßler
> Zuse Institute Berlin (ZIB)
> Takustraße 7
> D-14195 Berlin-Dahlem
> Germany
> dressler at zib.de
> Phone: +49 30 84185-261
> http://www.zib.de/
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