Sirraide wrote:
> Well, there was some head-scratching before debugging revealed that Clang was
> treating `malloc()` as a built-in.
Yeah, we have a class of ‘builtins’ that are marked as a `LibBuiltin` in
`clang/Basic/Builtins.td`, and iirc that’s basically literally every function
in the C standard library (and a few from the C++ standard library like
`std::move`, `std::forward`, etc.). It’s what allows us to e.g. optimise
`printf("foo\n")` → `puts("foo")`. If you only want *actual* builtin functions,
you’ll have to exclude those, but I’m not sure all the builtins are nonblocking
because I don’t know every single builtin off the top of my head...
If need be, it should be possible to add additional information to
`Builtins.td` to signify what builtins are blocking etc., but I’d probably only
recommend doing that if it turns out that that applies to a large number of
them.
https://github.com/llvm/llvm-project/pull/99656
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