[PATCH] D147131: [PoC][TabgleGen] Add new bang operator !apply

[Wang Pengcheng via Phabricator via llvm-commits]

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There is no way to pass function as a value in TableGen, but we can
treat DAGs as S-expression and evaluate them.

In this patch, a new bang operator is added:

  type value = !apply<type>(dag[, param]);

We can treat `dag` as function and evaluate it on `params`.

To not increase complexity, we map DAGs to subset of existed bang
operators. But we may support more bang operator or even user-definded
subroutines.

The need of `!apply` has been discussed in D146198 <https://reviews.llvm.org/D146198>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147131

Files:
  llvm/include/llvm/TableGen/Record.h
  llvm/lib/TableGen/Record.cpp
  llvm/lib/TableGen/TGLexer.cpp
  llvm/lib/TableGen/TGLexer.h
  llvm/lib/TableGen/TGParser.cpp
  llvm/test/TableGen/apply.td

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