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9812c90023
Marking a stored property as unavailable with `@available` should be banned,
just like it already is banned for potential unavailability. Unavailable code
is not supposed be reachable at runtime, but unavailable properties with
storage create a back door into executing arbitrary unavailable code at
runtime:
```
@available(*, unavailable)
struct Unavailable {
init() {
print("Unavailable.init()")
}
}
struct S {
@available(*, unavailable)
var x = Unavailable()
}
_ = S() // prints "Unavailable.init()"
```
Resolves rdar://107449845
79 lines
2.5 KiB
Swift
79 lines
2.5 KiB
Swift
// RUN: %target-typecheck-verify-swift -parse-as-library
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// REQUIRES: OS=macosx
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@available(macOS, unavailable)
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struct UnavailableMacOSStruct {}
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@available(*, unavailable)
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public struct UniversallyUnavailableStruct {}
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// Ok, initialization of globals is lazy and boxed.
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@available(macOS, unavailable)
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var unavailableMacOSGlobal: UnavailableMacOSStruct = .init()
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@available(*, unavailable)
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var universallyUnavailableGlobal: UniversallyUnavailableStruct = .init()
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struct GoodAvailableStruct {
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// Ok, computed property.
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@available(macOS, unavailable)
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var unavailableMacOS: UnavailableMacOSStruct {
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get { UnavailableMacOSStruct() }
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}
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// Ok, initialization of static vars is lazy and boxed.
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@available(macOS, unavailable)
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static var staticUnavailableMacOS: UnavailableMacOSStruct = .init()
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}
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@available(macOS, unavailable)
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struct GoodUnavailableMacOSStruct {
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var unavailableMacOS: UnavailableMacOSStruct = .init()
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lazy var lazyUnavailableMacOS: UnavailableMacOSStruct = .init()
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// Ok, the container is unavailable.
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@available(macOS, unavailable)
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var unavailableMacOSExplicit: UnavailableMacOSStruct = .init()
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}
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@available(macOS, unavailable)
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struct GoodNestedUnavailableMacOSStruct {
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struct Inner {
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var unavailableMacOS: UnavailableMacOSStruct = .init()
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lazy var lazyUnavailableMacOS: UnavailableMacOSStruct = .init()
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// Ok, the container is unavailable.
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@available(macOS, unavailable)
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var unavailableMacOSExplicit: UnavailableMacOSStruct = .init()
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}
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}
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@available(*, unavailable)
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struct GoodUniversallyUnavailableStruct {
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var universallyUnavailable: UniversallyUnavailableStruct = .init()
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lazy var lazyUniversallyUnavailable: UniversallyUnavailableStruct = .init()
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@available(*, unavailable)
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var universallyUnavailableExplicit: UniversallyUnavailableStruct = .init()
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}
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struct BadStruct {
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// expected-error@+1 {{stored properties cannot be marked unavailable with '@available'}}
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@available(macOS, unavailable)
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var unavailableMacOS: UnavailableMacOSStruct = .init()
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// expected-error@+1 {{stored properties cannot be marked unavailable with '@available'}}
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@available(macOS, unavailable)
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lazy var lazyUnavailableMacOS: UnavailableMacOSStruct = .init()
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// expected-error@+1 {{stored properties cannot be marked unavailable with '@available'}}
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@available(*, unavailable)
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var universallyUnavailable: UniversallyUnavailableStruct = .init()
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}
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enum GoodAvailableEnum {
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@available(macOS, unavailable)
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case unavailableMacOS(UnavailableMacOSStruct)
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}
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