[SR-8243] Assertion failed: (archetype->requiresClass() && "don't know what to do") #50775
Comments
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cc @rjmccall, aschwaighofer@apple.com (JIRA User), @slavapestov. Anything we can do without the full project? |
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The full project for this is the Twitch iOS app. I'm skeptical that I could get approval to give that to anyone outside the company. Let me know if there's any information I can pull from the project though. |
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I think we are going to need more code than shown. The failing function is an re-abstraction thunk from native Swift closures to blocks. reabstraction thunk helper <A, B><A1, B1 where A1: AnyObject, B1: AnyObject> from
@escaping @callee_guaranteed (
@guaranteed @escaping @callee_guaranteed (
@guaranteed @escaping @callee_guaranteed (@guaranteed TwitchKit.(ObjcBox in _DA7F7CEE4B414290E144F07A4CB20784)<A>) -> (),
@guaranteed @escaping @callee_guaranteed (@guaranteed TwitchKit.(ObjcBox in _DA7F7CEE4B414290E144F07A4CB20784)<B>) -> ()
) -> ()
) -> ()
to
@escaping @callee_unowned @convention(block) (
@unowned @escaping @callee_unowned @convention(block) (
@unowned @escaping @callee_unowned @convention(block) (@unowned TwitchKit.(ObjcBox in _DA7F7CEE4B414290E144F07A4CB20784)<A>) -> (),
@unowned @escaping @callee_unowned @convention(block) (@unowned TwitchKit.(ObjcBox in _DA7F7CEE4B414290E144F07A4CB20784)<B>) -> ()
) -> ()
) -> ()This would be similar to the closure shown above but AFAICT the innermost closures would look something like: |
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I'll take a look. As a workaround, you can disable reflection metadata emission. |
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I think I see what the problem is. |
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Ok I think the error comes from this particular bit of code: private init<ObjcValue, ObjcError>(_bridging future: TWFuture<ObjcValue, ObjcError>, resultMapper: TWResultMapper<ObjcBox<Value>, ObjcBox<Error>, ObjcValue, ObjcError>) {
self.init(on: .immediate, { (resolver) in
let completion = resultMapper.flatMapFuture(future, onCancel: {
resolver.cancel()
}).onComplete({ (resultSwitchBlock) in
resultSwitchBlock({ (value) in
resolver.fulfill(with: value.value)
}, { (error) in
resolver.reject(with: error.value)
})
})
resolver.onRequestCancel(on: .main, { (_) in
completion.cancel()
})
})
}based on the fact that |
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Does ObjectBox conform to _ObjectiveCBridgeable? |
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@slavapestov No it does not. The declaration of |
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I finally found a way to reproduce the issue. |
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I have a very similar problem internally as rdar://22470076 (yes, that's from 2015). |
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For some reason we're not hitting this crash anymore with the version of the compiler in Xcode Beta 5. |
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Kevin's original submission indicated he was testing a developer toolchain, which has asserts enabled. I'm not seeing a compile-time crash in a release build either. |
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Ah, that makes sense. We were using a developer toolchain because of other crashes that were fixed in the nightlies but not yet in the swiftc bundled in Xcode. |
AnthonyLatsis
added
the
crash
Environment
Xcode 10.0 (10L201y)
Swift 4.2 Snapshot 2018-07-11 (a)
Apple Swift version 4.2-dev (LLVM da1c9a3ae4, Clang a0e59b03e6, Swift 104c96a)
Additional Detail from JIRA
md5: a7390e0f869f33ea3d0d0d423849ddb6
Issue Description:
The current Swift 4.2 toolchain crashes on my code with the following stack trace:
This occurs when emitting the IR SIL function
@$S9TwitchKit7ObjcBox33_DA7F7CEE4B414290E144F07A4CB20784LLCyxGIegg_ADyq_GIegg_Ieggg_Iegg_AEIeyBy_AFIeyBy_IeyByy_IeyBy_Rld__CRld_0_Cr0_0_lTR.That symbol looks a bit odd, I don't know why there are so many layers of function there. The
ObjcBoxclass just looks likeand it's just used as a wrapper for arbitrary Swift types so they can be passed to Obj-C generics. Usage looks like
This code compiles just fine with Xcode 9.4.
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