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by int_19h
2748 days ago
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Sure, but now you need C code that needs to be aware of your trampoline, specifically. Good luck if it's an existing library. Also, what happens if there are multiple interleaved C parts of the stack, and the innermost one invokes the trampoline? What happens to the ones in the middle? It all sounds awfully like setjmp/longjmp (which is the one thing that you never do in C if you want to interoperate with anything in a sane fashion). And I don't think FFI direction matters much. The moment you have callbacks, your stack has interleaving of languages anyway (i.e. X called into Y which called back into X). Does it really matter which language the innermost and the outermost stack frames belong to? You still need to handle the mix in the middle. |
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This sounds like a native compiler perspective to me; with pure VM fibers like Snigl's these are not issues.
It's not about direction, it's about controlling the world from the outside.
You sound more like you're on a mission to prove to the world it's impossible, since Rust didn't manage to get it right.