[cfe-dev] Pragma information in AST processing

[Peter Thoman]

Hi, this is my first post to the list.

For what I'm currently working on I'd like to use some information 
extracted from pragmas in an AST visiting/transformation pass. Since (as 
far as I can see) pragma information is only available in the 
preprocessing pass I currently see 2 ways of doing this, both using 
PragmaHandlers in the preprocessor:
(1) collect a list of the pragmas, their information and the associated 
source locations during preprocessing, then in the AST visitor check if 
we are at a location on a line directly after some pragma and if so 
process based on the information collected previously
(2) rewrite the pragmas to some dummy function call, which will be 
visible in the AST and can be used for further processing during AST 
traversal

Neither of these options seems particularly clean to me so I would 
appreciate if someone who is more experienced with clang can think of a 
better solution. Otherwise I'll go ahead with the first option.

Cheers,
  Peter