NSObject: on the heap or the stack?

Question

Is an Objective-C object, e.g., NSString, placed on the stack or the heap?

Answer 1

The pointee of an Objective-C object is stored on the heap. But there are two exceptions: constant strings like @"foo" and block literals are stored in the __DATA segment (for global variables).

Normally none of ObjC objects will be stored on the stack.

Answer 2

They are allocated on the heap. That's true for basically all Objective-C objects, blocks being the only exception I can think of at the moment.