Metatype Types
A concrete or existential Metatype in SIL must describe its representation. This can be:
- @thin,meaning that it requires no storage and thus necessarily represents an exact type (only allowed for concrete Metatypes);
- @thick,meaning that it stores a reference to a type or (if a concrete class) a subclass of that type; or
- @objc,meaning that it stores a reference to a class type (or a subclass thereof) using an Objective-C class object representation rather than the native Swift type-object representation.
用于类型和函数类型的描述
https://github.com/apple/swift/blob/master/docs/SIL.rst#Metatype-types
%2 = function_ref @ProtocolCase.normalStruct.init() -> ProtocolCase.normalStruct : [email protected](method) (@thin normalStruct.Type) -> normalStruct // user: %3
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