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`AvailabilityRange` is now being used as a currency type in more of the compiler, and some of those uses are in permanent `ASTContext` allocations. The class wraps the `VersionRange` utility, which is itself a wrapper around `llvm::VersionTuple` with some additional storage for representing sentinel values. Even though the two sentinel values can be be represented with just a single bit of additional storage on top of the 16 bytes required to represent `VersionTuple`, because of alignment requirements the sentinel values end up bloating the layout of `VersionRange` by many bytes. To make `AvailabilityRange` and `VersionRange` more efficient to store, we can instead reserve two unlikely `llvm::VersionTuple` bit patterns as the sentinel values instead. The values chosen are the same ones LLVM uses to represent version tuple tombstones and empty keys in a `DenseMap`.
45 lines
2.0 KiB
Swift
45 lines
2.0 KiB
Swift
// RUN: %target-typecheck-verify-swift
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@available(macOS, introduced: 2147483646) // expected-warning {{'2147483646' is not a supported version number}}
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func funcIntroducedInMacOS2147483646() { }
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@available(macOS 2147483646, *) // expected-warning {{'2147483646' is not a supported version number}}
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func funcIntroducedInMacOS2147483646Short() { }
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@available(macOS, deprecated: 2147483646) // expected-warning {{'2147483646' is not a supported version number}}
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func funcDeprecatedInMacOS2147483646() { }
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@available(macOS, obsoleted: 2147483646) // expected-warning {{'2147483646' is not a supported version number}}
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func funcObsoletedInMacOS2147483646() { }
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@available(macOS, introduced: 2147483647) // expected-warning {{'2147483647' is not a supported version number}}
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func funcIntroducedInMacOS2147483647() { }
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@available(macOS 2147483647, *) // expected-warning {{'2147483647' is not a supported version number}}
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func funcIntroducedInMacOS2147483647Short() { }
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@available(macOS, deprecated: 2147483647) // expected-warning {{'2147483647' is not a supported version number}}
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func funcDeprecatedInMacOS2147483647() { }
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@available(macOS, obsoleted: 2147483647) // expected-warning {{'2147483647' is not a supported version number}}
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func funcObsoletedInMacOS2147483647() { }
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@available(swift, introduced: 2147483646) // expected-warning {{'2147483646' is not a supported version number}}
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func funcIntroducedInSwift2147483646() { }
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func useExtremeVersions() {
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if #available(macOS 2147483646, *) { // expected-warning {{'2147483646' is not a supported version number}}
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funcIntroducedInMacOS2147483646()
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funcIntroducedInMacOS2147483646Short()
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funcDeprecatedInMacOS2147483646()
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funcObsoletedInMacOS2147483646()
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}
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if #available(macOS 2147483647, *) { // expected-warning {{'2147483647' is not a supported version number}}
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funcIntroducedInMacOS2147483647()
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funcIntroducedInMacOS2147483647Short()
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funcDeprecatedInMacOS2147483647()
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funcObsoletedInMacOS2147483647()
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}
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funcIntroducedInSwift2147483646()
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}
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