[Rock-dev] clang vs. typelib

[Martin Zenzes]

Hi,

playing around a little bit, reading into this nice codebase of 
LLVM/clang and talking to Matthias. Concerned with this horrible state 
of gccxml -- no offense -- but it does not make sense to force it to 
cross-compile if it is going to be replaced sooner than later. So:

What does a replacement for gccxml in typelib have to provide:
- the full qualifying names of all types defined in a given set of 
header-files
- their memory layout: offset+type of all members, the sizeof the type 
itself
right?

Nice would be:
- bail out if types use too fancy features, like virtual functions or 
dynamic members (except some whitelisted special cases)

The proof-of-concept-level stuff I have so far is living in 
$WIESE/temp/mzenzes/clang-typelib.bare but it would make more sense to 
push it out into the internet -- should i use my private github account 
for things like this?

--


The second point can be done using "clang -fdump-record-layouts" (see 
http://lists.cs.uiuc.edu/pipermail/cfe-dev/2014-July/037778.html. It 
results in an output like this:

    0 | struct base::JointState
    0 |   double position
    8 |   float speed
   12 |   float effort
   16 |   float raw
      | [sizeof=24, dsize=20, align=8
      |  nvsize=20, nvalign=8]

for the first point (and third) "clang-check -ast-list" could be used -- 
but it prints too much. So a small clang-tool with added filtering might 
come in handy?

Greetings
     Martin

ps: sorry if this is posted twice... my mail client?
-- 
M.Sc. Martin Zenzes
Space Robotics

Hauptgeschäftsstelle Standort Bremen:
DFKI GmbH
Robotics Innovation Center
Robert-Hooke-Straße 5
28359 Bremen, Germany

Phone: +49 (0) 421 178 45 - 6658
Fax: +49 (0) 421 178 45 - 4150
E-Mail: martin.zenzes at dfki.de

Weitere Informationen: http://www.dfki.de/robotik
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