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[SR-8750] Segmentation Fault 11 when bridging NSSet<id<MyObjCProtocol>> * to swift #51258

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swift-ci opened this issue Sep 14, 2018 · 2 comments
Open

[SR-8750] Segmentation Fault 11 when bridging NSSet<id<MyObjCProtocol>> * to swift #51258

swift-ci opened this issue Sep 14, 2018 · 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 crash Bug: A crash, i.e., an abnormal termination of software

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@swift-ci
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Previous ID SR-8750
Radar rdar://problem/44460364
Original Reporter hannesoid (JIRA User)
Type Bug

Attachment: Download

Environment

Xcode 10 GM, Swift 4, Swift 4.2

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

md5: 1e58ba560df7d4fb0d63d2bf82937816

Issue Description:

This code causes a Segmentation Fault 11

@objc class MyObjCObject1: NSObject, MyObjCProtocol {}
@objc class MyObjCObject2: NSObject, MyObjCProtocol {}

// Compiler crash:
let producesSegfault = MyObjCController(set: [MyObjCObject1(), MyObjCObject2()]) 

// MyObjCController initializer is defined in ObjC:
// - (instancetype)initWithSet:(NSSet<id<MyObjCProtocol>> *)selectedObjects
// mapped to swift: init(set selectedObjects: Set<AnyHashable>)

An example project is attached.
@belkadan
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With assertions:

Unhandled coercion
UNREACHABLE executed at /Volumes/Data/swift-public/swift/lib/Sema/CSApply.cpp:6925!

1.  While type-checking declaration 0x7f81dfe2f8a8 at /Users/jrose/Downloads/Segfault11Example/SegmentationFaultExample/SegfaultingSwift.swift:24:1
2.  While type-checking expression at [/Users/jrose/Downloads/Segfault11Example/SegmentationFaultExample/SegfaultingSwift.swift:24:24 - line:24:62] RangeText="MyObjCController(set: [myObj1, myObj2])"

@belkadan
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Weirdly and somewhat worryingly, adding an explicit as Set<AnyHashable> makes the crash go away for me. At least there's a workaround!

@swift-ci create

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@AnthonyLatsis AnthonyLatsis added the crash Bug: A crash, i.e., an abnormal termination of software label Dec 12, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself crash Bug: A crash, i.e., an abnormal termination of software
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@belkadan @swift-ci @AnthonyLatsis