[llvm-dev] TableGen 'code' type to be eliminated

[Madhur Amilkanthwar via llvm-dev]

Well, it is not semantically different but having "code" in .td files does
make the files readble to me, at least. It distinctly tells me that the
value of the field is a C++ code which needs to be grammatically correct.
This extra semantics associated with "code" is appealing for readibility.

On Fri, Nov 20, 2020, 10:22 PM Paul C. Anagnostopoulos via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> We are seriously considering eliminating the 'code' type from TableGen.
> The 'code' type is used to represent code sequences, which are specified
> with the [{ ... }] brackets. The bracket syntax will be retained, but the
> type distinction will be eliminated.
>
> A code sequence is stored as a string, but with the type of 'code'. Some
> string operations, such as the paste operator (#), work on code, too. But
> other operations, such as !strconcat and !eq, do not. There does not appear
> to be any reason to maintain the distinction between string and code,
> except when formatting the value of a field. We will retain the two formats
> "..." and [{...}] when printing a field value.
>
> I have checked all the TableGen backends and none appear to make any
> semantic distinction between strings and code.
>
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