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//===------- FingerprintedExternalHolder.swift ----------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2020 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
//
//===----------------------------------------------------------------------===//
/// Central place to check an invariant: If an externalDependency has a fingerprint, it should point
/// to a swiftmodule file that contains dependency information.
protocol ExternalDependencyAndFingerprintEnforcer {
var externalDependencyToCheck: ExternalDependency? {get}
var fingerprint: InternedString? {get}
}
extension ExternalDependencyAndFingerprintEnforcer {
func verifyExternalDependencyAndFingerprint() -> Bool {
if let _ = self.fingerprint,
let externalDependency = externalDependencyToCheck,
!externalDependency.isSwiftModule {
fatalError("An external dependency with a fingerprint must point to a swiftmodule file: \(externalDependency)")
}
return true
}
}
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