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...he current state of TableGen documentation. TableGen needs a proper programmer's guide, which differs from a reference. I actually started such a rewrite here, but I never tried submitting it to Phabricator, because it wasn't clear to me who was responsible for review: https://github.com/johnwbyrd/llvm-mos/blob/master/llvm/docs/TableGen/index.rst https://github.com/johnwbyrd/llvm-mos/blob/master/llvm/docs/TableGen/Deficiencies.rst Most of the concepts behind TableGen are simple. They should be communicated simply, as per Chris's original documentation. The things that are not simple...

Yes, I understand the problem. To be more useful, TableGen would have to carry the traces along with the classes and records and (re)display the values while the substitutions are being made. I'm writing a new Programmer's Guide for TableGen and have been digging into the parse-time versus substitution-time issue. I haven't found a document that makes it clear. Can you give a quick