[PATCH] D46054: [TableGen] Add a general-purpose JSON backend.

[Simon Tatham via Phabricator via llvm-commits]

simon_tatham updated this revision to Diff 144564.
simon_tatham added a comment.

OK, here's my second draft. Changes since last time:

- thrown out the ad-hoc JSON emitter in favour of the new JSON library in https://reviews.llvm.org/D45753  (also requires the integer-handling followup patch https://reviews.llvm.org/D46209 )
- moved the new source file into `lib/TableGen` where clang-tblgen will be able to get at it more easily (but I haven't actually added it to clang-tblgen yet)
- removed all the type and abstract class information, leaving only the concrete records and a couple of pieces of metadata that I know backends do actually want (list of `field` keywords, list of superclasses, list of instances of each class). Exotic subclasses of Init are now rendered as `kind="complex"` with only a printable representation.
- flattened the JSON structure by several layers to make it more convenient to consume
- added documentation of the format.

I think from //my// perspective this is no longer an unfinished draft; I'd be happy to commit it in this state, subject to code review approval and its dependencies landing.


https://reviews.llvm.org/D46054

Files:
  docs/TableGen/BackEnds.rst
  docs/TableGen/index.rst
  include/llvm/TableGen/Record.h
  lib/TableGen/CMakeLists.txt
  lib/TableGen/JSONBackend.cpp
  test/TableGen/JSON-check.py
  test/TableGen/JSON.td
  utils/TableGen/TableGen.cpp

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