mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
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
35 lines
1.2 KiB
Swift
35 lines
1.2 KiB
Swift
// RUN: %target-typecheck-verify-swift -target %target-cpu-apple-macosx10.50
|
|
|
|
// REQUIRES: OS=macosx
|
|
|
|
struct AlwaysAvailable {}
|
|
|
|
@available(macOS, introduced: 10.50)
|
|
struct Available10_50 {}
|
|
|
|
@available(macOS, introduced: 10.51)
|
|
struct Available10_51 {}
|
|
|
|
@available(macOS, unavailable)
|
|
struct UnavailableOnMacOS {}
|
|
|
|
@available(*, unavailable)
|
|
struct UnavailableUnconditionally {}
|
|
|
|
var alwaysAvailableVar: AlwaysAvailable = .init() // Ok
|
|
|
|
@available(macOS, introduced: 10.50)
|
|
var availableOn10_50Var: Available10_50 = .init() // Ok
|
|
|
|
// Script-mode globals have eagerly executed initializers so it isn't safe for
|
|
// them to be unavailable.
|
|
|
|
@available(macOS, introduced: 10.51) // expected-error {{global variable cannot be marked potentially unavailable with '@available' in script mode}}
|
|
var potentiallyUnavailableVar: Available10_51 = .init()
|
|
|
|
@available(macOS, unavailable) // expected-error {{global variable cannot be marked unavailable with '@available' in script mode}}
|
|
var unavailableOnMacOSVar: UnavailableOnMacOS = .init()
|
|
|
|
@available(*, unavailable) // expected-error {{global variable cannot be marked unavailable with '@available' in script mode}}
|
|
var unconditionallyUnavailableVar: UnavailableUnconditionally = .init()
|