I'm curious: what are you hoping to accomplish with corelibs-xctest? If we can help you by modifying corelibs-xctest itself, that could be another option here. :)
- Brian Gesiak On Mon, Nov 21, 2016 at 10:46 AM, Jeff Kelley via swift-users < swift-users@swift.org> wrote: > The type comes from XCTest. I’m trying to enumerate Objective-C methods in > order to use them with XCTest in the open-source Swift version of XCTest, > which needs the tests to be supplied as this type: > > /// This is a compound type used by `XCTMain` to represent tests to run. It > combines an > /// `XCTestCase` subclass type with the list of test case methods to invoke > on the class. > /// This type is intended to be produced by the `testCase` helper function. > /// - seealso: `testCase` > /// - seealso: `XCTMain` > public typealias XCTestCaseEntry = (testCaseClass: XCTestCase.Type, allTests: > [(String, (XCTestCase) throws -> Void)]) > > > > > Jeff Kelley > > slauncha...@gmail.com | @SlaunchaMan <https://twitter.com/SlaunchaMan> | > jeffkelley.org > > On Nov 21, 2016, at 1:13 AM, Jacob Bandes-Storch <jtban...@gmail.com> > wrote: > > "throws" is the part that's not representable in Obj-C. Why are you using > it? If you're interacting with method_getImplementation, you need to think > like the Obj-C runtime. > > https://developer.apple.com/library/content/documentation/ > Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtHowMessagingWorks.html#// > apple_ref/doc/uid/TP40008048-CH104-SW1 > > This works: > > typealias DescriptionMethod = @convention(c) (NSObject, Selector) -> > NSString > > let fn = unsafeBitCast(method_getImplementation(class_ > getInstanceMethod(NSObject.self, "description")), DescriptionMethod.self) > > fn(NSObject(), "description") as String > > > Jacob > > On Sun, Nov 20, 2016 at 9:41 PM, Jeff Kelley <slauncha...@gmail.com> > wrote: > >> Still trying on this (copied the code directly, Foo is actually >> XCTestCase): >> >> typealias TestMethod = @convention(c) (XCTestCase) throws -> Void >> >> This seagulls the compiler with “error: '(XCTestCase) throws -> Void' is >> not representable in Objective-C, so it cannot be used with '@convention(c) >> ’”. I’m trying to use it here: >> >> let testMethod: IMP = method_getImplementation(method) >> >> let test: TestMethod = unsafeBitCast(testMethod, >> to: TestMethod.self) >> >> testMethods.append((methodName as String, test)) >> >> If I try to put the type directly in the call to unsafeBitCast(), the >> compiler gives me an error: >> >> Attribute can only be applied to types, not declarations >> >> Thanks for your suggestions! I hadn’t seen @convention() before. >> >> >> Jeff Kelley >> >> slauncha...@gmail.com | @SlaunchaMan <https://twitter.com/SlaunchaMan> | >> jeffkelley.org >> >> On Nov 21, 2016, at 12:08 AM, Jacob Bandes-Storch <jtban...@gmail.com> >> wrote: >> >> For a function such as bar() above, the type you want to cast the IMP to >> would probably be "@convention(c) (Foo, Selector) -> ()". >> >> On Sun, Nov 20, 2016 at 9:05 PM, Jeff Kelley <slauncha...@gmail.com> >> wrote: >> >>> Thanks Jacob! I tried using unsafeBitCast, but it fails with the >>> following: “fatal error: can't unsafeBitCast between types of different >>> sizes”. I considered wrapping every call in a closure that calls >>> objc_msgSend(), but alas, that’s not exposed to Swift. I have another >>> approach in mind, so I’ll try that next. >>> >>> >>> Jeff Kelley >>> >>> slauncha...@gmail.com | @SlaunchaMan <https://twitter.com/SlaunchaMan> >>> | jeffkelley.org >>> >>> On Nov 19, 2016, at 1:58 AM, Jacob Bandes-Storch <jtban...@gmail.com> >>> wrote: >>> >>> I imagine unsafeBitCast would be the way to go here. But are you >>> assuming that all of the instance methods have type "(Foo) throws -> Void" >>> ? Or do you somehow want to dynamically use the type information? >>> >>> Jacob >>> >>> On Fri, Nov 18, 2016 at 10:37 PM, Jeff Kelley via swift-users < >>> swift-users@swift.org> wrote: >>> >>>> Hello, >>>> >>>> I’m trying to enumerate the methods of a class in Swift using the >>>> Objective-C runtime. Everything is working fine so far, except for the very >>>> last step. Suppose I have a Swift class like this: >>>> >>>> class Foo: SomeSuperclass { >>>> >>>> @objc func bar() { >>>> print("Hello, World!") >>>> } >>>> >>>> } >>>> >>>> Using the Objective-C runtime methods, I can get the method with >>>> class_copyMethodList and then get to the method’s implementation using >>>> method_getImplementation. However, what I need to do next is to stick >>>> this into a tuple that looks like this: >>>> >>>> typealias FooEntry = (fooClass: SomeSuperclass.Type, methods: [(String, >>>> (Foo) throws -> Void)]) >>>> >>>> For now, the workaround is to make a static variable that returns all >>>> of the entries: >>>> >>>> static var allEntries = { >>>> return [ >>>> ("bar", bar), >>>> ] >>>> } >>>> >>>> Is there any way to go from the raw IMP that I get back from the >>>> runtime to the Swift type so I can construct this list dynamically? >>>> >>>> >>>> Jeff Kelley >>>> >>>> slauncha...@gmail.com | @SlaunchaMan <https://twitter.com/SlaunchaMan> >>>> | jeffkelley.org >>>> >>>> >>>> _______________________________________________ >>>> swift-users mailing list >>>> swift-users@swift.org >>>> https://lists.swift.org/mailman/listinfo/swift-users >>>> >>>> >>> >>> >> >> > > > _______________________________________________ > swift-users mailing list > swift-users@swift.org > https://lists.swift.org/mailman/listinfo/swift-users > >
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