mirror of
https://github.com/apple/swift.git
synced 2025-12-21 12:14:44 +01:00
e3e0f440a1
Deserializing a witness record in a conformance may fail if either of the requirement or witness changed name or type, most likely due to SDK modernization changes across Swift versions. When this happens, leave an opaque placeholder in the conformance to indicate that the witness exists but we don't get to see it. For expedience, right now this just witnesses the requirement to itself, so that code in the type checker or elsewhere that tries to ad-hoc devirtualize references to the requirement just gets the requirement back. Arguably, we shouldn't include the witness at all in imported conformances, since they should be an implementation detail, but that's a bigger, riskier change. This patch as is should be enough to address rdar://problem/31185053.
72 lines
2.9 KiB
Swift
72 lines
2.9 KiB
Swift
|
|
// Swift 3 sees the ObjC class NSRuncibleSpoon as the class, and uses methods
|
|
// with type signatures involving NSRuncibleSpoon to conform to protocols
|
|
// across the language boundary. Swift 4 sees the type as bridged to
|
|
// a RuncibleSpoon value type, but still needs to be able to use conformances
|
|
// declared by Swift 3.
|
|
|
|
// Swift 3, importing Swift 3 and Swift 4 code
|
|
|
|
import SomeObjCModule
|
|
import SomeSwift3Module
|
|
import SomeSwift4Module
|
|
|
|
func testMatchAndMix(bridged: RuncibleSpoon, unbridged: NSRuncibleSpoon) {
|
|
let objcInstanceViaClass
|
|
= SomeObjCClass(someSwiftInitRequirement: unbridged)
|
|
|
|
let objcClassAsS3Protocol: SomeSwift3Protocol.Type = SomeObjCClass.self
|
|
let objcInstanceViaS3Protocol
|
|
= objcClassAsS3Protocol.init(someSwiftInitRequirement: unbridged)
|
|
|
|
let objcClassAsS4Protocol: SomeSwift4Protocol.Type = SomeObjCClass.self
|
|
let objcInstanceViaS4Protocol
|
|
= objcClassAsS4Protocol.init(someSwiftInitRequirement: bridged)
|
|
|
|
var bridgedSink: RuncibleSpoon
|
|
var unbridgedSink: NSRuncibleSpoon
|
|
|
|
let swiftPropertyViaClass = objcInstanceViaClass.someSwiftPropertyRequirement
|
|
unbridgedSink = swiftPropertyViaClass
|
|
let swiftPropertyViaS3Protocol = objcInstanceViaS3Protocol.someSwiftPropertyRequirement
|
|
unbridgedSink = swiftPropertyViaS3Protocol
|
|
let swiftPropertyViaS4Protocol = objcInstanceViaS4Protocol.someSwiftPropertyRequirement
|
|
bridgedSink = swiftPropertyViaS4Protocol
|
|
|
|
objcInstanceViaClass.someSwiftMethodRequirement(unbridged)
|
|
objcInstanceViaS3Protocol.someSwiftMethodRequirement(unbridged)
|
|
objcInstanceViaS4Protocol.someSwiftMethodRequirement(bridged)
|
|
|
|
let swift3InstanceViaClass
|
|
= SomeSwift3Class(someObjCInitRequirement: unbridged)
|
|
let swift3ClassAsProtocol: SomeObjCProtocol.Type = SomeSwift3Class.self
|
|
let swift3InstanceViaProtocol
|
|
= swift3ClassAsProtocol.init(someObjCInitRequirement: unbridged)
|
|
|
|
let objcPropertyViaClassS3 = swift3InstanceViaClass.someObjCPropertyRequirement
|
|
unbridgedSink = objcPropertyViaClassS3
|
|
let objcPropertyViaProtocolS3 = swift3InstanceViaProtocol.someObjCPropertyRequirement
|
|
unbridgedSink = objcPropertyViaProtocolS3
|
|
|
|
swift3InstanceViaClass.someObjCMethodRequirement(unbridged)
|
|
swift3InstanceViaProtocol.someObjCMethodRequirement(unbridged)
|
|
|
|
let swift4InstanceViaClass
|
|
= SomeSwift4Class(someObjCInitRequirement: bridged)
|
|
let swift4ClassAsProtocol: SomeObjCProtocol.Type = SomeSwift4Class.self
|
|
let swift4InstanceViaProtocol
|
|
= swift4ClassAsProtocol.init(someObjCInitRequirement: unbridged)
|
|
|
|
let objcPropertyViaClassS4 = swift4InstanceViaClass.someObjCPropertyRequirement
|
|
bridgedSink = objcPropertyViaClassS4
|
|
let objcPropertyViaProtocolS4 = swift4InstanceViaProtocol.someObjCPropertyRequirement
|
|
unbridgedSink = objcPropertyViaProtocolS4
|
|
|
|
swift4InstanceViaClass.someObjCMethodRequirement(bridged)
|
|
swift4InstanceViaProtocol.someObjCMethodRequirement(unbridged)
|
|
|
|
_ = bridgedSink
|
|
_ = unbridgedSink
|
|
}
|
|
|