[Rock-dev] clang vs. typelib

[Janosch Machowinski]

On 17.07.2014 13:30, Sylvain Joyeux wrote:
>> We could also place references to TLB files in TLB files themself,
>> and generate a TLB File per header file. In this case we could stop
>> parsing anything, it there is already a TLB file for an included
>> header. This could lead to big speedups, as we don't reparse all the
>> headers over and over again.
> Before going into modifications on the typelib side, I would rather
> look into why it is so slow (and ask the clang mailing list how to
> make it faster). Compiling a file that includes base/Pose.hpp and does
> something with a base::Pose takes 1.61s on my machine, not 15s. Maybe
> there would be a way to prune the traversal at the declaration level
> since we really don't care about the inside of the methods.
Definitely.
This comment was more about the logic, how to convert the AST
to Typelib later on. How would the final API to this tool look like ?
- Give Types, and Headers, to put into a TLB ?
  - Dump every Type from a set of Headers into a TLB ?

     Janosch

>
> If we come to that, I would really really not break the self-contained
> nature of tlb files, because it won't be manageable (if you update a
> linked tlb file because a struct change but NOT the other ones, you
> are breaking the type definitions). What would definitely be doable is
> to save a self-contained TLB per header file in a cache folder and
> have the clang importer merge these tlbs into the current registry
> whenever an include is found. Now, how do you detect the includes
> without traversing the AST ? And -- more importantly -- how do you
> make sure that the cache is properly invalidated when some
> include-in-include-in-include file gets invalidated ? Or when the
> import options (such as the opaque list) gets modified ? Big can of
> worms.
>
> Sylvain
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  Dipl. Inf. Janosch Machowinski
  SAR- & Sicherheitsrobotik

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