[PATCH] D124221: Add new builtin __builtin_reflect_struct.

Aaron Ballman via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Fri Apr 22 12:48:55 PDT 2022

aaron.ballman added a comment.

Thank you for looking into this! I've also thought that the `__builtin_dump_struct` implementation hasn't been quite as robust as it could be. However, the primary use case for that builtin has been for kernel folks to debug when they have no access to an actual debugger -- it being a super limited interface is actually a feature rather than a bug, in some ways.

I think what you're designing here is straight-up reflection, which is a different use case. If we're going to get something that's basically only usable in C++, I'm not certain there's much value in adding builtins for reflection until WG21 decides what reflection looks like, and then we can design around that. (Personally, I think designing usable reflection interfaces for C would be considerably harder but would provide considerably more benefit to users given the lack of reflection capabilities. There's almost no chance WG14 and WG21 would come up with the same interfaces for reflection, so I think we've got some opportunity for exploration here.)

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