swift的调用约定

swift的静态绑定

Swift Calling Convention @convention(swift)

func foo(_ x:Int, y:Int)

sil @foo : $(x:Int, y:Int) -> () {

entry(%x : $Int, %y : $Int):

...

}

func bar(_ x:Int, y:(Int, Int))

sil @bar : $(x:Int, y:(Int, Int)) -> () {

entry(%x : $Int, %y0 : $Int, %y1 : $Int):

...

}

func call_foo_and_bar() {

foo(1, 2)

bar(4, (5, 6))

}

sil @call_foo_and_bar : $() -> () {

entry:

...

%foo = function_ref @foo : $(x:Int, y:Int) -> ()

%foo_result = apply %foo(%1, %2) : $(x:Int, y:Int) -> ()

...

%bar = function_ref @bar : $(x:Int, y:(Int, Int)) -> ()

%bar_result = apply %bar(%4, %5, %6) : $(x:Int, y:(Int, Int)) -> ()

}

Swift Method Calling Convention @convention(method)

The method calling convention is currently identical to the freestanding function convention. Methods are considered to be curried functions, taking the "self" argument as their outer argument clause, and the method arguments as the inner argument clause(s). When uncurried, the "self" argument is thus passed last:

struct Foo {

func method(_ x:Int) -> Int {}

}

sil @Foo_method_1 : $((x : Int), @inout Foo) -> Int { ... }

//例子

class NSObjectBase: NSObject {

func Msg_Second(str:String){}

}

// NSObjectBase.Msg_Second(str:)

sil hidden @NSObjectBase.NSObjectBase.Msg_Second(str: Swift.String) -> () : $@convention(method) (@guaranteed String, @guaranteed NSObjectBase) -> ()

sil_vtable NSObjectBase {

#NSObjectBase.Msg_Second!1: (NSObjectBase) -> (String) -> () : @NSObjectBase.NSObjectBase.Msg_Second(str: Swift.String) -> () // NSObjectBase.Msg_Second(str:)

}

Objective-C Calling Convention @convention(objc_method)

https://github.com/apple/swift/blob/master/docs/SIL.rst#objective-c-calling-convention-convention-objc-method