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[SR-5086] Cyclic metadata dependency error in generic type with nested enum with associated value of outer generic type #47662

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swift-ci opened this issue Jun 3, 2017 · 2 comments
Closed

[SR-5086] Cyclic metadata dependency error in generic type with nested enum with associated value of outer generic type #47662

swift-ci opened this issue Jun 3, 2017 · 2 comments
Labels
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 run-time crash Bug → crash: Swift code crashed during execution runtime The Swift Runtime

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@swift-ci
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swift-ci commented Jun 3, 2017

Previous ID SR-5086
Radar None
Original Reporter neightchan (JIRA User)
Type Bug
Status Resolved
Resolution Duplicate
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, RunTimeCrash, Runtime
Assignee None
Priority Medium

md5: e73a65761d1d79420e920b3b51d5415a

duplicates:

  • SR-5650 Remove parent field from type metadata

relates to:

  • SR-4732 "Tree" enum crashes at runtime "cyclic metadata dependency detected, aborting"

Issue Description:

The following code

struct Outer<T> {
    enum Inner {
        case none
        case one(T)
    }
    
    var o: Inner
    
    init() {
        o = .none
    }
}

let o = Outer<Int>()

yields the following runtime error

GenericCache(0x406050): cyclic metadata dependency detected, aborting

Editorializing:

The following code achieves the same result.

struct Outer<T> {
    typealias Inner = Outer_Inner<T>
    
    var o: Inner
    
    init() {
        o = .none
    }
}

enum Outer_Inner<T> {
    case none
    case one(T)
}

let o = Outer<Int>()

Why is the code with nested generics not "transformed into" the code without (up to renaming)?
@belkadan
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belkadan commented Jun 5, 2017

The runtime metadata for types currently preserves nesting information, so that transformation isn't entirely equivalent. But yes, this should definitely be supported.

@belkadan
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belkadan commented Jun 5, 2017

cc @rjmccall

@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
This issue was closed.
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Labels
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 run-time crash Bug → crash: Swift code crashed during execution runtime The Swift Runtime
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@belkadan @swift-ci @AnthonyLatsis