Review Request 122160: WIP: Use buddy as fallback for headers without explicitly pinned TU.

[Milian Wolff]

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https://git.reviewboard.kde.org/r/122160/
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Review request for KDevelop.


Repository: kdev-clang


Description
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In such cases, it's worthwile to use the source buddy as best-guess as
it allows us to get rid of the parse run for the "header TU" which
gets thrown away later on anyways.

Note that this might be troublesome and lead to infinite recursion
when the buddy's TU is not including the header file, as we'd then
reschedule the header for parsing and end up with the same situation
as before. Suggestions on how to fix this would be welcome...

Performance wise, this patch improves the index run on a 48 file
project using STL: It goes from ~17s down to ~14s, just b/c we safe
a few needless clang runs on "header TUs".


Diffs
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  CMakeLists.txt 22deffa2bbd5c7e2558ab1548b4447667d9671e4 
  clangsupport.cpp f4f49b079d52462cfb0d56086780751605a6ab46 
  documentfinderhelpers.h  
  documentfinderhelpers.cpp  
  duchain/CMakeLists.txt 8ed282b652361c45c668fa948917e075fed4f277 
  duchain/clangindex.cpp 25c7855e7bd67aa2a3be28f1ea803dd025e6a1ba 

Diff: https://git.reviewboard.kde.org/r/122160/diff/


Testing
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Thanks,

Milian Wolff

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