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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 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
//
//===----------------------------------------------------------------------===//
#if _runtime(_ObjC)
import SwiftShims
/// Equivalent to `NSDictionary.allKeys`, but does not leave objects on the
/// autorelease pool.
internal func _stdlib_NSDictionary_allKeys(
_ object: AnyObject
) -> _BridgingBuffer {
let nsd = unsafeBitCast(object, to: _NSDictionary.self)
let count = nsd.count
let storage = _BridgingBuffer(count)
nsd.getObjects(nil, andKeys: storage.baseAddress, count: count)
return storage
}
extension _NativeDictionary { // Bridging
@usableFromInline
__consuming internal func bridged() -> AnyObject {
_connectOrphanedFoundationSubclassesIfNeeded()
// We can zero-cost bridge if our keys are verbatim
// or if we're the empty singleton.
// Temporary var for SOME type safety.
let nsDictionary: _NSDictionaryCore
if _storage === __RawDictionaryStorage.empty || count == 0 {
nsDictionary = __RawDictionaryStorage.empty
} else if _isBridgedVerbatimToObjectiveC(Key.self),
_isBridgedVerbatimToObjectiveC(Value.self) {
nsDictionary = unsafeDowncast(
_storage,
to: _DictionaryStorage<Key, Value>.self)
} else {
nsDictionary = _SwiftDeferredNSDictionary(self)
}
return nsDictionary
}
}
/// An NSEnumerator that works with any _NativeDictionary of
/// verbatim bridgeable elements. Used by the various NSDictionary impls.
final internal class _SwiftDictionaryNSEnumerator<Key: Hashable, Value>
: __SwiftNativeNSEnumerator, _NSEnumerator {
@nonobjc internal var base: _NativeDictionary<Key, Value>
@nonobjc internal var bridgedKeys: __BridgingHashBuffer?
@nonobjc internal var nextBucket: _NativeDictionary<Key, Value>.Bucket
@nonobjc internal var endBucket: _NativeDictionary<Key, Value>.Bucket
@objc
internal override required init() {
_internalInvariantFailure("don't call this designated initializer")
}
internal init(_ base: __owned _NativeDictionary<Key, Value>) {
_internalInvariant(_isBridgedVerbatimToObjectiveC(Key.self))
_internalInvariant(_orphanedFoundationSubclassesReparented)
self.base = base
self.bridgedKeys = nil
self.nextBucket = base.hashTable.startBucket
self.endBucket = base.hashTable.endBucket
super.init()
}
@nonobjc
internal init(_ deferred: __owned _SwiftDeferredNSDictionary<Key, Value>) {
_internalInvariant(!_isBridgedVerbatimToObjectiveC(Key.self))
_internalInvariant(_orphanedFoundationSubclassesReparented)
self.base = deferred.native
self.bridgedKeys = deferred.bridgeKeys()
self.nextBucket = base.hashTable.startBucket
self.endBucket = base.hashTable.endBucket
super.init()
}
private func bridgedKey(at bucket: _HashTable.Bucket) -> AnyObject {
_internalInvariant(base.hashTable.isOccupied(bucket))
if let bridgedKeys = self.bridgedKeys {
return bridgedKeys[bucket]
}
return _bridgeAnythingToObjectiveC(base.uncheckedKey(at: bucket))
}
@objc
internal func nextObject() -> AnyObject? {
if nextBucket == endBucket {
return nil
}
let bucket = nextBucket
nextBucket = base.hashTable.occupiedBucket(after: nextBucket)
return self.bridgedKey(at: bucket)
}
@objc(countByEnumeratingWithState:objects:count:)
internal func countByEnumerating(
with state: UnsafeMutablePointer<_SwiftNSFastEnumerationState>,
objects: UnsafeMutablePointer<AnyObject>,
count: Int
) -> Int {
var theState = state.pointee
if theState.state == 0 {
theState.state = 1 // Arbitrary non-zero value.
theState.itemsPtr = AutoreleasingUnsafeMutablePointer(objects)
theState.mutationsPtr = _fastEnumerationStorageMutationsPtr
}
if nextBucket == endBucket {
state.pointee = theState
return 0
}
// Return only a single element so that code can start iterating via fast
// enumeration, terminate it, and continue via NSEnumerator.
let unmanagedObjects = _UnmanagedAnyObjectArray(objects)
unmanagedObjects[0] = self.bridgedKey(at: nextBucket)
nextBucket = base.hashTable.occupiedBucket(after: nextBucket)
state.pointee = theState
return 1
}
}
/// This class exists for Objective-C bridging. It holds a reference to a
/// _NativeDictionary, and can be upcast to NSSelf when bridging is
/// necessary. This is the fallback implementation for situations where
/// toll-free bridging isn't possible. On first access, a _NativeDictionary
/// of AnyObject will be constructed containing all the bridged elements.
final internal class _SwiftDeferredNSDictionary<Key: Hashable, Value>
: __SwiftNativeNSDictionary, _NSDictionaryCore {
@usableFromInline
internal typealias Bucket = _HashTable.Bucket
// This stored property must be stored at offset zero. We perform atomic
// operations on it.
//
// Do not access this property directly.
@nonobjc
private var _bridgedKeys_DoNotUse: AnyObject?
// This stored property must be stored at offset one. We perform atomic
// operations on it.
//
// Do not access this property directly.
@nonobjc
private var _bridgedValues_DoNotUse: AnyObject?
/// The unbridged elements.
internal var native: _NativeDictionary<Key, Value>
internal init(_ native: __owned _NativeDictionary<Key, Value>) {
_internalInvariant(native.count > 0)
_internalInvariant(!_isBridgedVerbatimToObjectiveC(Key.self) ||
!_isBridgedVerbatimToObjectiveC(Value.self))
self.native = native
super.init()
}
@objc
internal required init(
objects: UnsafePointer<AnyObject?>,
forKeys: UnsafeRawPointer,
count: Int
) {
_internalInvariantFailure("don't call this designated initializer")
}
@nonobjc
private var _bridgedKeysPtr: UnsafeMutablePointer<AnyObject?> {
return _getUnsafePointerToStoredProperties(self)
.assumingMemoryBound(to: Optional<AnyObject>.self)
}
@nonobjc
private var _bridgedValuesPtr: UnsafeMutablePointer<AnyObject?> {
return _bridgedKeysPtr + 1
}
/// The buffer for bridged keys, if present.
@nonobjc
private var _bridgedKeys: __BridgingHashBuffer? {
guard let ref = _stdlib_atomicLoadARCRef(object: _bridgedKeysPtr) else {
return nil
}
return unsafeDowncast(ref, to: __BridgingHashBuffer.self)
}
/// The buffer for bridged values, if present.
@nonobjc
private var _bridgedValues: __BridgingHashBuffer? {
guard let ref = _stdlib_atomicLoadARCRef(object: _bridgedValuesPtr) else {
return nil
}
return unsafeDowncast(ref, to: __BridgingHashBuffer.self)
}
/// Attach a buffer for bridged Dictionary keys.
@nonobjc
private func _initializeBridgedKeys(_ storage: __BridgingHashBuffer) {
_stdlib_atomicInitializeARCRef(object: _bridgedKeysPtr, desired: storage)
}
/// Attach a buffer for bridged Dictionary values.
@nonobjc
private func _initializeBridgedValues(_ storage: __BridgingHashBuffer) {
_stdlib_atomicInitializeARCRef(object: _bridgedValuesPtr, desired: storage)
}
@nonobjc
internal func bridgeKeys() -> __BridgingHashBuffer? {
if _isBridgedVerbatimToObjectiveC(Key.self) { return nil }
if let bridgedKeys = _bridgedKeys { return bridgedKeys }
// Allocate and initialize heap storage for bridged keys.
let bridged = __BridgingHashBuffer.allocate(
owner: native._storage,
hashTable: native.hashTable)
for bucket in native.hashTable {
let object = _bridgeAnythingToObjectiveC(native.uncheckedKey(at: bucket))
bridged.initialize(at: bucket, to: object)
}
// Atomically put the bridged keys in place.
_initializeBridgedKeys(bridged)
return _bridgedKeys!
}
@nonobjc
internal func bridgeValues() -> __BridgingHashBuffer? {
if _isBridgedVerbatimToObjectiveC(Value.self) { return nil }
if let bridgedValues = _bridgedValues { return bridgedValues }
// Allocate and initialize heap storage for bridged values.
let bridged = __BridgingHashBuffer.allocate(
owner: native._storage,
hashTable: native.hashTable)
for bucket in native.hashTable {
let value = native.uncheckedValue(at: bucket)
let cocoaValue = _bridgeAnythingToObjectiveC(value)
bridged.initialize(at: bucket, to: cocoaValue)
}
// Atomically put the bridged values in place.
_initializeBridgedValues(bridged)
return _bridgedValues!
}
@objc(copyWithZone:)
internal func copy(with zone: _SwiftNSZone?) -> AnyObject {
// Instances of this class should be visible outside of standard library as
// having `NSDictionary` type, which is immutable.
return self
}
@inline(__always)
private func _key(
at bucket: Bucket,
bridgedKeys: __BridgingHashBuffer?
) -> AnyObject {
if let bridgedKeys = bridgedKeys {
return bridgedKeys[bucket]
}
return _bridgeAnythingToObjectiveC(native.uncheckedKey(at: bucket))
}
@inline(__always)
private func _value(
at bucket: Bucket,
bridgedValues: __BridgingHashBuffer?
) -> AnyObject {
if let bridgedValues = bridgedValues {
return bridgedValues[bucket]
}
return _bridgeAnythingToObjectiveC(native.uncheckedValue(at: bucket))
}
@objc(objectForKey:)
internal func object(forKey aKey: AnyObject) -> AnyObject? {
guard let nativeKey = _conditionallyBridgeFromObjectiveC(aKey, Key.self)
else { return nil }
let (bucket, found) = native.find(nativeKey)
guard found else { return nil }
return _value(at: bucket, bridgedValues: bridgeValues())
}
@objc
internal func keyEnumerator() -> _NSEnumerator {
if _isBridgedVerbatimToObjectiveC(Key.self) {
return _SwiftDictionaryNSEnumerator<Key, Value>(native)
}
return _SwiftDictionaryNSEnumerator<Key, Value>(self)
}
@objc(getObjects:andKeys:count:)
internal func getObjects(
_ objects: UnsafeMutablePointer<AnyObject>?,
andKeys keys: UnsafeMutablePointer<AnyObject>?,
count: Int
) {
_precondition(count >= 0, "Invalid count")
guard count > 0 else { return }
let bridgedKeys = bridgeKeys()
let bridgedValues = bridgeValues()
var i = 0 // Current position in the output buffers
defer { _fixLifetime(self) }
switch (_UnmanagedAnyObjectArray(keys), _UnmanagedAnyObjectArray(objects)) {
case (let unmanagedKeys?, let unmanagedObjects?):
for bucket in native.hashTable {
unmanagedKeys[i] = _key(at: bucket, bridgedKeys: bridgedKeys)
unmanagedObjects[i] = _value(at: bucket, bridgedValues: bridgedValues)
i += 1
guard i < count else { break }
}
case (let unmanagedKeys?, nil):
for bucket in native.hashTable {
unmanagedKeys[i] = _key(at: bucket, bridgedKeys: bridgedKeys)
i += 1
guard i < count else { break }
}
case (nil, let unmanagedObjects?):
for bucket in native.hashTable {
unmanagedObjects[i] = _value(at: bucket, bridgedValues: bridgedValues)
i += 1
guard i < count else { break }
}
case (nil, nil):
// Do nothing
break
}
}
@objc(enumerateKeysAndObjectsWithOptions:usingBlock:)
internal func enumerateKeysAndObjects(
options: Int,
using block: @convention(block) (
Unmanaged<AnyObject>,
Unmanaged<AnyObject>,
UnsafeMutablePointer<UInt8>
) -> Void) {
let bridgedKeys = bridgeKeys()
let bridgedValues = bridgeValues()
defer { _fixLifetime(self) }
var stop: UInt8 = 0
for bucket in native.hashTable {
let key = _key(at: bucket, bridgedKeys: bridgedKeys)
let value = _value(at: bucket, bridgedValues: bridgedValues)
block(
Unmanaged.passUnretained(key),
Unmanaged.passUnretained(value),
&stop)
if stop != 0 { return }
}
}
@objc
internal var count: Int {
return native.count
}
@objc(countByEnumeratingWithState:objects:count:)
internal func countByEnumerating(
with state: UnsafeMutablePointer<_SwiftNSFastEnumerationState>,
objects: UnsafeMutablePointer<AnyObject>?,
count: Int
) -> Int {
defer { _fixLifetime(self) }
let hashTable = native.hashTable
var theState = state.pointee
if theState.state == 0 {
theState.state = 1 // Arbitrary non-zero value.
theState.itemsPtr = AutoreleasingUnsafeMutablePointer(objects)
theState.mutationsPtr = _fastEnumerationStorageMutationsPtr
theState.extra.0 = CUnsignedLong(hashTable.startBucket.offset)
}
// Test 'objects' rather than 'count' because (a) this is very rare anyway,
// and (b) the optimizer should then be able to optimize away the
// unwrapping check below.
if _slowPath(objects == nil) {
return 0
}
let unmanagedObjects = _UnmanagedAnyObjectArray(objects!)
var bucket = _HashTable.Bucket(offset: Int(theState.extra.0))
let endBucket = hashTable.endBucket
_precondition(bucket == endBucket || hashTable.isOccupied(bucket),
"Invalid fast enumeration state")
var stored = 0
// Only need to bridge once, so we can hoist it out of the loop.
let bridgedKeys = bridgeKeys()
for i in 0..<count {
if bucket == endBucket { break }
unmanagedObjects[i] = _key(at: bucket, bridgedKeys: bridgedKeys)
stored += 1
bucket = hashTable.occupiedBucket(after: bucket)
}
theState.extra.0 = CUnsignedLong(bucket.offset)
state.pointee = theState
return stored
}
}
@available(*, unavailable)
extension _SwiftDeferredNSDictionary: Sendable {}
// NOTE: older runtimes called this struct _CocoaDictionary. The two
// must coexist without conflicting ObjC class names from the nested
// classes, so it was renamed. The old names must not be used in the new
// runtime.
@usableFromInline
@frozen
internal struct __CocoaDictionary {
@usableFromInline
internal let object: AnyObject
@inlinable
internal init(_ object: __owned AnyObject) {
self.object = object
}
}
@available(*, unavailable)
extension __CocoaDictionary: Sendable {}
extension __CocoaDictionary {
@usableFromInline
internal func isEqual(to other: __CocoaDictionary) -> Bool {
return _stdlib_NSObject_isEqual(self.object, other.object)
}
}
extension __CocoaDictionary: _DictionaryBuffer {
@usableFromInline
internal typealias Key = AnyObject
@usableFromInline
internal typealias Value = AnyObject
@usableFromInline // FIXME(cocoa-index): Should be inlinable
internal var startIndex: Index {
@_effects(releasenone)
get {
let allKeys = _stdlib_NSDictionary_allKeys(self.object)
return Index(Index.Storage(self, allKeys), offset: 0)
}
}
@usableFromInline // FIXME(cocoa-index): Should be inlinable
internal var endIndex: Index {
@_effects(releasenone)
get {
let allKeys = _stdlib_NSDictionary_allKeys(self.object)
return Index(Index.Storage(self, allKeys), offset: allKeys.count)
}
}
@usableFromInline // FIXME(cocoa-index): Should be inlinable
@_effects(releasenone)
internal func index(after index: Index) -> Index {
validate(index)
var result = index
result._offset += 1
return result
}
internal func validate(_ index: Index) {
_precondition(index.storage.base.object === self.object, "Invalid index")
_precondition(index._offset < index.storage.allKeys.count,
"Attempt to access endIndex")
}
@usableFromInline // FIXME(cocoa-index): Should be inlinable
internal func formIndex(after index: inout Index, isUnique: Bool) {
validate(index)
index._offset += 1
}
@usableFromInline // FIXME(cocoa-index): Should be inlinable
@_effects(releasenone)
internal func index(forKey key: Key) -> Index? {
// Fast path that does not involve creating an array of all keys. In case
// the key is present, this lookup is a penalty for the slow path, but the
// potential savings are significant: we could skip a memory allocation and
// a linear search.
if lookup(key) == nil {
return nil
}
let allKeys = _stdlib_NSDictionary_allKeys(object)
for i in 0..<allKeys.count {
if _stdlib_NSObject_isEqual(key, allKeys[i]) {
return Index(Index.Storage(self, allKeys), offset: i)
}
}
_internalInvariantFailure(
"An NSDictionary key wasn't listed amongst its enumerated contents")
}
@usableFromInline
internal var count: Int {
let nsd = unsafeBitCast(object, to: _NSDictionary.self)
return nsd.count
}
@usableFromInline
internal func contains(_ key: Key) -> Bool {
let nsd = unsafeBitCast(object, to: _NSDictionary.self)
return nsd.object(forKey: key) != nil
}
@usableFromInline
internal func lookup(_ key: Key) -> Value? {
let nsd = unsafeBitCast(object, to: _NSDictionary.self)
return nsd.object(forKey: key)
}
@usableFromInline // FIXME(cocoa-index): Should be inlinable
@_effects(releasenone)
internal func lookup(_ index: Index) -> (key: Key, value: Value) {
_precondition(index.storage.base.object === self.object, "Invalid index")
let key: Key = index.storage.allKeys[index._offset]
let value: Value = index.storage.base.object.object(forKey: key)!
return (key, value)
}
@usableFromInline // FIXME(cocoa-index): Make inlinable
@_effects(releasenone)
func key(at index: Index) -> Key {
_precondition(index.storage.base.object === self.object, "Invalid index")
return index.key
}
@usableFromInline // FIXME(cocoa-index): Make inlinable
@_effects(releasenone)
func value(at index: Index) -> Value {
_precondition(index.storage.base.object === self.object, "Invalid index")
let key = index.storage.allKeys[index._offset]
return index.storage.base.object.object(forKey: key)!
}
}
extension __CocoaDictionary {
@inlinable
internal func mapValues<Key: Hashable, Value, T>(
_ transform: (Value) throws -> T
) rethrows -> _NativeDictionary<Key, T> {
var result = _NativeDictionary<Key, T>(capacity: self.count)
for (cocoaKey, cocoaValue) in self {
let key = _forceBridgeFromObjectiveC(cocoaKey, Key.self)
let value = _forceBridgeFromObjectiveC(cocoaValue, Value.self)
try result.insertNew(key: key, value: transform(value))
}
return result
}
}
extension __CocoaDictionary {
@frozen
@usableFromInline
internal struct Index {
internal var _storage: Builtin.BridgeObject
internal var _offset: Int
internal var storage: Storage {
@inline(__always)
get {
let storage = _bridgeObject(toNative: _storage)
return unsafeDowncast(storage, to: Storage.self)
}
}
internal init(_ storage: Storage, offset: Int) {
self._storage = _bridgeObject(fromNative: storage)
self._offset = offset
}
}
}
extension __CocoaDictionary.Index {
// FIXME(cocoa-index): Try using an NSEnumerator to speed this up.
internal class Storage {
// Assumption: we rely on NSDictionary.getObjects when being
// repeatedly called on the same NSDictionary, returning items in the same
// order every time.
// Similarly, the same assumption holds for NSSet.allObjects.
/// A reference to the NSDictionary, which owns members in `allObjects`,
/// or `allKeys`, for NSSet and NSDictionary respectively.
internal let base: __CocoaDictionary
// FIXME: swift-3-indexing-model: try to remove the cocoa reference, but
// make sure that we have a safety check for accessing `allKeys`. Maybe
// move both into the dictionary/set itself.
/// An unowned array of keys.
internal var allKeys: _BridgingBuffer
internal init(
_ base: __owned __CocoaDictionary,
_ allKeys: __owned _BridgingBuffer
) {
self.base = base
self.allKeys = allKeys
}
}
}
extension __CocoaDictionary.Index {
@usableFromInline
internal var handleBitPattern: UInt {
@_effects(readonly)
get {
return unsafeBitCast(storage, to: UInt.self)
}
}
@usableFromInline
internal var dictionary: __CocoaDictionary {
@_effects(releasenone)
get {
return storage.base
}
}
}
extension __CocoaDictionary.Index {
@usableFromInline // FIXME(cocoa-index): Make inlinable
@nonobjc
internal var key: AnyObject {
@_effects(readonly)
get {
_precondition(_offset < storage.allKeys.count,
"Attempting to access Dictionary elements using an invalid index")
return storage.allKeys[_offset]
}
}
@usableFromInline // FIXME(cocoa-index): Make inlinable
@nonobjc
internal var age: Int32 {
@_effects(readonly)
get {
return _HashTable.age(for: storage.base.object)
}
}
}
extension __CocoaDictionary.Index: Equatable {
@usableFromInline // FIXME(cocoa-index): Make inlinable
@_effects(readonly)
internal static func == (
lhs: __CocoaDictionary.Index,
rhs: __CocoaDictionary.Index
) -> Bool {
_precondition(lhs.storage.base.object === rhs.storage.base.object,
"Comparing indexes from different dictionaries")
return lhs._offset == rhs._offset
}
}
extension __CocoaDictionary.Index: Comparable {
@usableFromInline // FIXME(cocoa-index): Make inlinable
@_effects(readonly)
internal static func < (
lhs: __CocoaDictionary.Index,
rhs: __CocoaDictionary.Index
) -> Bool {
_precondition(lhs.storage.base.object === rhs.storage.base.object,
"Comparing indexes from different dictionaries")
return lhs._offset < rhs._offset
}
}
extension __CocoaDictionary: Sequence {
@usableFromInline
final internal class Iterator {
// Cocoa Dictionary iterator has to be a class, otherwise we cannot
// guarantee that the fast enumeration struct is pinned to a certain memory
// location.
// This stored property should be stored at offset zero. There's code below
// relying on this.
internal var _fastEnumerationState: _SwiftNSFastEnumerationState =
_makeSwiftNSFastEnumerationState()
// This stored property should be stored right after
// `_fastEnumerationState`. There's code below relying on this.
internal var _fastEnumerationStackBuf = _CocoaFastEnumerationStackBuf()
internal let base: __CocoaDictionary
internal var _fastEnumerationStatePtr:
UnsafeMutablePointer<_SwiftNSFastEnumerationState> {
return _getUnsafePointerToStoredProperties(self).assumingMemoryBound(
to: _SwiftNSFastEnumerationState.self)
}
internal var _fastEnumerationStackBufPtr:
UnsafeMutablePointer<_CocoaFastEnumerationStackBuf> {
return UnsafeMutableRawPointer(_fastEnumerationStatePtr + 1)
.assumingMemoryBound(to: _CocoaFastEnumerationStackBuf.self)
}
// These members have to be word-sized integers, they cannot be limited to
// Int8 just because our storage holds 16 elements: fast enumeration is
// allowed to return inner pointers to the container, which can be much
// larger.
internal var itemIndex: Int = 0
internal var itemCount: Int = 0
internal init(_ base: __owned __CocoaDictionary) {
self.base = base
}
}
@usableFromInline
@_effects(releasenone)
internal __consuming func makeIterator() -> Iterator {
return Iterator(self)
}
}
@available(*, unavailable)
extension __CocoaDictionary.Iterator: Sendable {}
extension __CocoaDictionary.Iterator: IteratorProtocol {
@usableFromInline
internal typealias Element = (key: AnyObject, value: AnyObject)
@usableFromInline
internal func nextKey() -> AnyObject? {
if itemIndex < 0 {
return nil
}
let base = self.base
if itemIndex == itemCount {
let stackBufCount = _fastEnumerationStackBuf.count
// We can't use `withUnsafeMutablePointer` here to get pointers to
// properties, because doing so might introduce a writeback storage, but
// fast enumeration relies on the pointer identity of the enumeration
// state struct.
itemCount = base.object.countByEnumerating(
with: _fastEnumerationStatePtr,
objects: UnsafeMutableRawPointer(_fastEnumerationStackBufPtr)
.assumingMemoryBound(to: AnyObject.self),
count: stackBufCount)
if itemCount == 0 {
itemIndex = -1
return nil
}
itemIndex = 0
}
let itemsPtrUP =
UnsafeMutableRawPointer(_fastEnumerationState.itemsPtr!)
.assumingMemoryBound(to: AnyObject.self)
let itemsPtr = _UnmanagedAnyObjectArray(itemsPtrUP)
let key: AnyObject = itemsPtr[itemIndex]
itemIndex += 1
return key
}
@usableFromInline
internal func next() -> Element? {
guard let key = nextKey() else { return nil }
let value: AnyObject = base.object.object(forKey: key)!
return (key, value)
}
}
//===--- Bridging ---------------------------------------------------------===//
extension Dictionary {
@inlinable
public __consuming func _bridgeToObjectiveCImpl() -> AnyObject {
guard _variant.isNative else {
return _variant.asCocoa.object
}
return _variant.asNative.bridged()
}
/// Returns the native Dictionary hidden inside this NSDictionary;
/// returns nil otherwise.
public static func _bridgeFromObjectiveCAdoptingNativeStorageOf(
_ s: __owned AnyObject
) -> Dictionary<Key, Value>? {
// Try all three NSDictionary impls that we currently provide.
if let deferred = s as? _SwiftDeferredNSDictionary<Key, Value> {
return Dictionary(_native: deferred.native)
}
if let nativeStorage = s as? _DictionaryStorage<Key, Value> {
return Dictionary(_native: _NativeDictionary(nativeStorage))
}
if s === __RawDictionaryStorage.empty {
return Dictionary()
}
// FIXME: what if `s` is native storage, but for different key/value type?
return nil
}
}
#endif // _runtime(_ObjC)
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