[PATCH] D127851: [TableGen] Add optional default value for !cast

[Wang Pengcheng via Phabricator via llvm-commits]

pcwang-thead created this revision.
pcwang-thead added reviewers: tra, nhaehnle, craig.topper, jdoerfert.
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Sometimes we want to get a default value instead of error
raised by TableGen when casting a string to a record, so
we add an optional second parameter to !cast operator as
default value.

If casting fails and default value is specified, we will
get default value and TableGen won't raise any error. If
there is no specified default value, the behivior is the
same as before.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D127851

Files:
  llvm/docs/TableGen/ProgRef.rst
  llvm/include/llvm/TableGen/Record.h
  llvm/lib/TableGen/Record.cpp
  llvm/lib/TableGen/TGParser.cpp
  llvm/test/TableGen/cast-with-default-value-of-wrong-type.td
  llvm/test/TableGen/cast-with-default-value.td
  llvm/test/TableGen/cast-without-default-value.td

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