swift的类型描述符

概述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 a

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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