Function hooking in Swift
github.com
github.com
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Consistently being able to hook functions in Swift is going to be a pain in release mode optimizations, as the Swift compiler does aggressive inlining.
From https://developer.apple.com/library/prerelease/ios/documenta... :
You use function types just like any other types in Swift. For example, you can define a constant or variable to be of a function type and assign an appropriate function to that variable:
var mathFunction: (Int, Int) -> Int = addTwoInts
mathFunction can now be passed around, fed in as a parameter in another function, etc. mathFunction is for all purposes a function pointer.
About the @asmname thing: you can easily dump every default Swift module using a REPL command:
repl> :print_module Swift
There you can find a lot of interesting language lexems and more, so all you have to do is to try using them in your code until you don't figure it out ;)
This is for struct alignment to address boundaries. It's fairly typical C and results in some performance optimizations.