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[SR-14932] Emit warning or error on mutually recursive initialization of static variables #57274

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typesanitizer opened this issue Jul 16, 2021 · 2 comments
Open

[SR-14932] Emit warning or error on mutually recursive initialization of static variables #57274

typesanitizer opened this issue Jul 16, 2021 · 2 comments
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compiler The Swift compiler in itself improvement

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@typesanitizer
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Previous ID SR-14932
Radar rdar://problem/80820297
Original Reporter @typesanitizer
Type Improvement
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Improvement
Assignee None
Priority Medium

md5: 36faab10dcbb62f023ce9867cbdc0585

Issue Description:

struct S {
    static var x: Int = y
    static var y: Int = x
}
print(S.x)

With Xcode 13 beta 2, this crashes at runtime without any warnings. IMO it should emit a warning or be an error.
@typesanitizer
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@swift-ci create

@atrick
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atrick commented Jul 31, 2021

Task: create a mandatory SIL diagnostic pass, e.g. "DiagnoseInitializerRecursion". This is closely related to DiagnoseInfiniteRecursion. Consider implementing it as part of that pass. This will catch obvious cycles in the initialization call graph, but won't be guaranteed to catch all cases.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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@atrick @typesanitizer