[adolph]

Can someone speak to the below statement from the article? I thought Objective-C did not have a runtime like memory managed languages like C#.

> avoid the runtime overhead of Objective-C in the kernel

From Apple docs[0]:

You typically don’t need to use the Objective-C runtime library directly when programming in Objective-C. This API is useful primarily for developing bridge layers between Objective-C and other languages, or for low-level debugging.

0. https://developer.apple.com/documentation/objectivec/objecti...

[twoodfin]

Objective-C does have a runtime that maintains all the state necessary to implement the APIs in the documentation you linked.

For example, how to map class objects to string representations of their names.

[dcrazy]

Yep, ObjC programs call into the runtime every time they call a method.