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//===--- BridgeStorage.swift ----------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 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
//
//===----------------------------------------------------------------------===//
//
// Bridged types are notionally single-word beasts that either store
// an objc class or a native Swift class. We'd like to be able to
// distinguish these cases efficiently.
//
//===----------------------------------------------------------------------===//
// RUN: %target-run-stdlib-swift
// REQUIRES: executable_test
// REQUIRES: objc_interop
import Swift
//===--- Code mimics the stdlib without using spare pointer bits ----------===//
import SwiftShims
protocol BridgeStorage {
associatedtype Native : AnyObject
associatedtype ObjC : AnyObject
init(native: Native, isFlagged: Bool)
init(native: Native)
init(objC: ObjC)
mutating func isUniquelyReferencedNative() -> Bool
mutating func isUniquelyReferencedUnflaggedNative() -> Bool
var isNative: Bool {get}
var isObjC: Bool {get}
var nativeInstance: Native {get}
var unflaggedNativeInstance: Native {get}
var objCInstance: ObjC {get}
}
extension _BridgeStorage : BridgeStorage {}
//===----------------------------------------------------------------------===//
//===--- Testing code -----------------------------------------------------===//
//===----------------------------------------------------------------------===//
import StdlibUnittest
var allTests = TestSuite("DiscriminatedBridgeObject")
class C {
deinit {
print("bye C!")
}
}
import Foundation
func isOSAtLeast(_ major: Int, _ minor: Int, patch: Int = 0) -> Bool {
// isOperatingSystemAtLeastVersion() is unavailable on some OS versions.
if #available(iOS 8.0, OSX 10.10, *) {
let procInfo: AnyObject = ProcessInfo.processInfo
return procInfo.isOperatingSystemAtLeast(
OperatingSystemVersion(majorVersion: major, minorVersion: minor,
patchVersion: patch))
}
return false
}
func expectTagged(_ s: NSString, _ expected: Bool) -> NSString {
#if arch(x86_64)
let mask: UInt = 0x8000000000000001
#elseif arch(arm64)
let mask: UInt = 0x8000000000000000
#else
let mask: UInt = 0
#endif
let taggedStringsSupported = mask != 0
let tagged = unsafeBitCast(s, to: UInt.self) & mask != 0
if taggedStringsSupported && expected == tagged {
// okay
} else if !taggedStringsSupported && !tagged {
// okay
} else {
let un = !tagged ? "un" : ""
fatalError("Unexpectedly \(un)tagged pointer for string \"\(s)\"")
}
return s
}
var taggedNSString : NSString {
return expectTagged(NSString(format: "foo"), true)
}
var unTaggedNSString : NSString {
return expectTagged("fûtbōl" as NSString, false)
}
allTests.test("_BridgeStorage") {
typealias B = _BridgeStorage<C>
let oy: NSString = "oy"
expectTrue(B(objC: oy).objCInstance === oy)
for flag in [false, true] {
do {
var b = B(native: C(), isFlagged: flag)
expectFalse(b.isObjC)
expectTrue(b.isNative)
expectEqual(!flag, b.isUnflaggedNative)
expectTrue(b.isUniquelyReferencedNative())
if !flag {
expectTrue(b.isUniquelyReferencedUnflaggedNative())
}
}
do {
let c = C()
var b = B(native: c, isFlagged: flag)
expectFalse(b.isObjC)
expectTrue(b.isNative)
expectFalse(b.isUniquelyReferencedNative())
expectEqual(!flag, b.isUnflaggedNative)
expectTrue(b.nativeInstance === c)
if !flag {
expectTrue(b.unflaggedNativeInstance === c)
expectFalse(b.isUniquelyReferencedUnflaggedNative())
}
// Keep 'c' alive for the isUniquelyReferenced check above.
_fixLifetime(c)
}
}
var b = B(native: C(), isFlagged: false)
expectTrue(b.isUniquelyReferencedNative())
// Add a reference and verify that it's still native but no longer unique
var c = b
expectFalse(b.isUniquelyReferencedNative())
_fixLifetime(b) // make sure b is not killed early
_fixLifetime(c) // make sure c is not killed early
let n = C()
var bb = B(native: n)
expectTrue(bb.nativeInstance === n)
expectTrue(bb.isNative)
expectTrue(bb.isUnflaggedNative)
expectFalse(bb.isObjC)
var d = B(objC: taggedNSString)
expectFalse(d.isUniquelyReferencedNative())
expectFalse(d.isNative)
expectFalse(d.isUnflaggedNative)
expectTrue(d.isObjC)
d = B(objC: unTaggedNSString)
expectFalse(d.isUniquelyReferencedNative())
expectFalse(d.isNative)
expectFalse(d.isUnflaggedNative)
expectTrue(d.isObjC)
}
runAllTests()
|
