[stdlib] Add a version number for the stdlib itself; use it in unit tests #24254
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // This source file is part of the Swift.org open source project | ||
| // | ||
| // Copyright (c) 2014 - 2019 Apple Inc. and the Swift project authors | ||
| // Licensed under Apache License v2.0 with Runtime Library Exception | ||
| // | ||
| // See https://swift.org/LICENSE.txt for license information | ||
| // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| public struct StdlibVersion: RawRepresentable { | ||
| public let rawValue: (Int, Int) | ||
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| public init(rawValue: (Int, Int)) { | ||
| self.rawValue = rawValue | ||
| } | ||
| } | ||
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| extension StdlibVersion { | ||
| public static func custom(_ version1: Int, _ version2: Int) -> StdlibVersion { | ||
| return StdlibVersion(rawValue: (version1, version2)) | ||
| } | ||
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| public static var currentlyRunning: StdlibVersion { | ||
| return StdlibVersion(rawValue: _stdlibDynamicVersion) | ||
| } | ||
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| // Shipped in macOS 10.14.2, iOS 12.2, watchOS 5.2, tvOS 13.2 | ||
| public static var swift5_0: StdlibVersion { | ||
| return StdlibVersion(rawValue: (1000, 0)) | ||
| } | ||
| } | ||
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| extension StdlibVersion: CustomStringConvertible { | ||
| public var description: String { | ||
| return "\(rawValue)" | ||
| } | ||
| } | ||
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| extension StdlibVersion: Equatable { | ||
| public static func == (left: StdlibVersion, right: StdlibVersion) -> Bool { | ||
| return left.rawValue == right.rawValue | ||
| } | ||
| } | ||
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| extension StdlibVersion: Hashable { | ||
| public func hash(into hasher: inout Hasher) { | ||
| hasher.combine(rawValue.0) | ||
| hasher.combine(rawValue.1) | ||
| } | ||
| } | ||
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| extension StdlibVersion: Comparable { | ||
| public static func < (left: StdlibVersion, right: StdlibVersion) -> Bool { | ||
| return left.rawValue < right.rawValue | ||
| } | ||
| } |
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Still a little confused. Why is this public?
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It allows tests to easily determine if they are back/forward deployed. Binaries that are intimately tied to a particular revision of the stdlib and should not be separately back/forward deployed (e.g. libswiftFoundation) could use it for sanity checks.
This is not strictly necessary, but it seems like a cheap addition. If it's available, the "current" version need not be duplicated (and updated) in more than one place.
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FWIW, dyld provides two similar version numbers through
NSVersionOfRunTimeLibraryandNSVersionOfLinkTimeLibrary.(The link-time version queries the linkage of the main executable, not the current object, so it's different(ly useful) than the static version number implemented here.)