does anyone know how `suspendCoroutineUninterceptedOrReturn` or `intercepted` is generated in corout...

# coroutines

[freddiewang]

does anyone know how suspendCoroutineUninterceptedOrReturn or intercepted is generated in coroutine library? I’m confused about why some core functions are auto-gen… Any specific reason?

[elizarov]

What exactly you what to know? What do you mean by “autogenerated”?

[freddiewang]

Hi @elizarov, because i am studying the implementation of kotlin coroutines and found some core functions like suspendCoroutineUninterceptedOrReturn throwing NotImplementedError("Implementation of suspendCoroutineUninterceptedOrReturn is intrinsic"). I am just curious where is the “real” implementation of those intrinsic functions and why kotlin has such design. It is very interesting. I can’t find them directly in the code base

[elizarov]

They are intrinsic, which means they are implemented by compiler. This particular function does not actually do anything. It is just a syntactic trick to expose coroutines calling convention. You can read more about it here: https://github.com/Kotlin/kotlin-coroutines/blob/master/kotlin-coroutines-informal.md#implementation-details

[freddiewang]

thanks Roman, reading the document!