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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2021 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
//
//===----------------------------------------------------------------------===//
/// This file is copied from swift-collections and should not be modified here.
/// Rather all changes should be made to swift-collections and copied back.
import Swift
extension Array {
/// Returns true if `Array.withContiguousStorageIfAvailable` is broken
/// in the stdlib we're currently running on.
///
/// See https://bugs.swift.org/browse/SR-14663.
internal static func _isWCSIABroken() -> Bool {
#if _runtime(_ObjC)
guard _isBridgedVerbatimToObjectiveC(Element.self) else {
// SR-14663 only triggers on array values that are verbatim bridged
// from Objective-C, so it cannot ever trigger for element types
// that aren't verbatim bridged.
return false
}
// SR-14663 was introduced in Swift 5.1. Check if we have a broken stdlib.
// The bug is caused by a bogus precondition inside a non-inlinable stdlib
// method, so to determine if we're affected, we need to check the currently
// running OS version.
#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
guard #available(macOS 10.15, iOS 13, watchOS 6, tvOS 13, *) else {
// The OS is too old to be affected by this bug.
return false
}
#endif
// FIXME: When a stdlib is released that contains a fix, add a check for it.
return true
#else
// Platforms that don't have an Objective-C runtime don't have verbatim
// bridged array values, so the bug doesn't apply to them.
return false
#endif
}
}
extension Sequence {
// An adjusted version of the standard `withContiguousStorageIfAvailable`
// method that works around https://bugs.swift.org/browse/SR-14663.
internal func _withContiguousStorageIfAvailable_SR14663<R>(
_ body: (UnsafeBufferPointer<Element>) throws -> R
) rethrows -> R? {
if Self.self == Array<Element>.self && Array<Element>._isWCSIABroken() {
return nil
}
return try self.withContiguousStorageIfAvailable(body)
}
}
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