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[SR-14535] Using ObjC Protocol type crashes the compiler when emitting swiftinterface #56887

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kabiroberai opened this issue Apr 27, 2021 · 2 comments
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[SR-14535] Using ObjC Protocol type crashes the compiler when emitting swiftinterface #56887

kabiroberai opened this issue Apr 27, 2021 · 2 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@kabiroberai
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Previous ID SR-14535
Radar rdar://problem/77224219
Original Reporter @kabiroberai
Type Bug
Status Resolved
Resolution Cannot Reproduce

Attachment: Download

Environment

macOS 11.2.3 (20D91), Xcode 12.5 (12E262), Swift 5.4. Tested against the macOS and iOS SDKs.

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug
Assignee None
Priority Medium

md5: 30a944d33c97dc065fe3bd3855122b39

Issue Description:

When building a framework with library evolution (edit: or even without evolution, so long as a module interface is emitted), publicly visible declarations involving the Objective-C Protocol class crash the compiler. For example:

public func foo(_: Protocol) {}

This appears to be a regression in Swift 5.4. I couldn't reproduce the crash as of Swift Development Snapshot 2021-04-18 (a), however I'm not sure whether that's because the regression has been patched or whether it was introduced in a commit that the snapshot doesn't contain.

I've attached a sample Xcode project demonstrating the issue, as well as a backtrace.
@typesanitizer
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@swift-ci create

@typesanitizer
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Yeah, this seems to be fixed on main. Marking this as resolved.

The snapshot should contain all the commits present in Swift 5.4; additional changes are first made on main and cherry-picked onto 5.4 (after the branch is cut) if needed.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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@typesanitizer @kabiroberai