[PATCH] D62953: [Syntax] Do not glue multiple empty PP expansions to a single mapping

[Ilya Biryukov via Phabricator via cfe-commits]

ilya-biryukov added a comment.

To clarify, I don't think there are new concepts in this patch.
Previously, we only took information from source locations into account when building token buffers. That works fine in most cases, but not enough to find the boundaries of empty macro expansions.
In order to find those, we now also watch the callbacks from the preprocessor to get all macro expansions (incuding the empty ones) and reconstruct the mappings of token buffers from there.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D62953/new/

https://reviews.llvm.org/D62953