[PATCH] D128704: [clang-extdef-mapping] Directly process .ast files

[Tobias Hieta via Phabricator via cfe-commits]

thieta created this revision.
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When doing CTU analysis setup you pre-compile .cpp to .ast and then
you run clang-extdef-mapping on the .cpp file as well. This is a
pretty slow process since we have to recompile the file each time.

With this patch you can now run clang-extdef-mapping directly on
the .ast file. That saves a lot of time.

I tried this on llvm/lib/AsmParser/Parser.cpp and running
extdef-mapping on the .cpp file took 5.4s on my machine.

While running it on the .ast file it took 2s.

This can save a lot of time for the setup phase of CTU analysis.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128704

Files:
  clang/tools/clang-extdef-mapping/ClangExtDefMapGen.cpp

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