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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
//
//===----------------------------------------------------------------------===//
import SwiftShims
// Implementation notes
// ====================
//
// `Dictionary` uses two storage schemes: native storage and Cocoa storage.
//
// Native storage is a hash table with open addressing and linear probing. The
// bucket array forms a logical ring (e.g., a chain can wrap around the end of
// buckets array to the beginning of it).
//
// The logical bucket array is implemented as three arrays: Key, Value, and a
// bitmap that marks valid entries. An invalid entry marks the end of a chain.
// There is always at least one invalid entry among the buckets. `Dictionary`
// does not use tombstones.
//
// In addition to the native storage, `Dictionary` can also wrap an
// `NSDictionary` in order to allow bridging `NSDictionary` to `Dictionary` in
// `O(1)`.
//
// Currently native storage uses a data structure like this::
//
// Dictionary<K,V> (a struct)
// +------------------------------------------------+
// | _VariantDictionaryBuffer<K,V> (an enum) |
// | +--------------------------------------------+ |
// | | [_NativeDictionaryBuffer<K,V> (a struct)] | |
// | +---|----------------------------------------+ |
// +----/-------------------------------------------+
// /
// |
// V _RawNativeDictionaryStorage (a class)
// +-----------------------------------------------------------+
// | bucketCount |
// | count |
// | ptrToBits |
// | ptrToKeys |
// | ptrToValues |
// | [inline array of bits indicating whether bucket is set ] |
// | [inline array of keys ] |
// | [inline array of values ] |
// +-----------------------------------------------------------+
//
//
// Cocoa storage uses a data structure like this::
//
// Dictionary<K,V> (a struct)
// +----------------------------------------------+
// | _VariantDictionaryBuffer<K,V> (an enum) |
// | +----------------------------------------+ |
// | | [ _CocoaDictionaryBuffer (a struct) ] | |
// | +---|------------------------------------+ |
// +-----|----------------------------------------+
// |
// +---+
// |
// V NSDictionary (a class)
// +--------------+
// | [refcount#1] |
// +--------------+
// ^
// +-+
// | Dictionary<K,V>.Index (an enum)
// +---|-----------------------------------+
// | | _CocoaDictionaryIndex (a struct) |
// | +-|-----------------------------+ |
// | | * [ all keys ] [ next index ] | |
// | +-------------------------------+ |
// +---------------------------------------+
//
//
// The Native Kinds of Storage
// ---------------------------
//
// There are three different classes that can provide a native backing storage:
// * `_RawNativeDictionaryStorage`
// * `_TypedNativeDictionaryStorage<K, V>` (extends Raw)
// * `_HashableTypedNativeDictionaryStorage<K: Hashable, V>` (extends Typed)
//
// (Hereafter RawStorage, TypedStorage, and HashableStorage, respectively)
//
// In a less optimized implementation, the parent classes could
// be eliminated, as they exist only to provide special-case behaviors.
// HashableStorage has everything a full implementation of a Dictionary
// requires, and is subsequently able to provide a full NSDictionary
// implementation. Note that HashableStorage must have the `K: Hashable`
// constraint because the NSDictionary implementation can't be provided in a
// constrained extension.
//
// In normal usage, you can expect the backing storage of a Dictionary to be a
// NativeStorage.
//
// TypedStorage is distinguished from HashableStorage to allow us to create a
// `_NativeDictionaryBuffer<AnyObject, AnyObject>`. Without the Hashable
// requirement, such a Buffer is restricted to operations which can be performed
// with only the structure of the Storage: indexing and iteration. This is used
// in _SwiftDeferredNSDictionary to construct twin "native" and "bridged"
// storage. Key-based lookups are performed on the native storage, with the
// resultant index then used on the bridged storage.
//
// The only thing that TypedStorage adds over RawStorage is an implementation of
// deinit, to clean up the AnyObjects it stores. Although it nominally
// inherits an NSDictionary implementation from RawStorage, this implementation
// isn't useful and is never used.
//
// RawStorage exists to allow a type-punned empty singleton Storage to be
// created. Any time an empty Dictionary is created, this Storage is used. If
// this type didn't exist, then NativeBuffer would have to store a Storage that
// declared its actual type parameters. Similarly, the empty singleton would
// have to declare its actual type parameters. If the singleton was, for
// instance, a `HashableStorage<(), ()>`, then it would be a violation of
// Swift's strict aliasing rules to pass it where a `HashableStorage<Int, Int>`
// was expected.
//
// It's therefore necessary for several types to store a RawStorage, rather than
// a TypedStorage, to allow for the possibility of the empty singleton.
// RawStorage also provides an implementation of an always-empty NSDictionary.
//
//
// Index Invalidation
// ------------------
//
// FIXME: decide if this guarantee is worth making, as it restricts
// collision resolution to first-come-first-serve. The most obvious alternative
// would be robin hood hashing. The Rust code base is the best
// resource on a *practical* implementation of robin hood hashing I know of:
// https://github.com/rust-lang/rust/blob/ac919fcd9d4a958baf99b2f2ed5c3d38a2ebf9d0/src/libstd/collections/hash/map.rs#L70-L178
//
// Indexing a container, `c[i]`, uses the integral offset stored in the index
// to access the elements referenced by the container. Generally, an index into
// one container has no meaning for another. However copy-on-write currently
// preserves indices under insertion, as long as reallocation doesn't occur:
//
// var (i, found) = d.find(k) // i is associated with d's storage
// if found {
// var e = d // now d is sharing its data with e
// e[newKey] = newValue // e now has a unique copy of the data
// return e[i] // use i to access e
// }
//
// The result should be a set of iterator invalidation rules familiar to anyone
// familiar with the C++ standard library. Note that because all accesses to a
// dictionary storage are bounds-checked, this scheme never compromises memory
// safety.
//
//
// Bridging
// ========
//
// Bridging `NSDictionary` to `Dictionary`
// ---------------------------------------
//
// FIXME(eager-bridging): rewrite this based on modern constraints.
//
// `NSDictionary` bridges to `Dictionary<NSObject, AnyObject>` in `O(1)`,
// without memory allocation.
//
// Bridging `Dictionary` to `NSDictionary`
// ---------------------------------------
//
// `Dictionary<K, V>` bridges to `NSDictionary` in O(1)
// but may incur an allocation depending on the following conditions:
//
// * If the Dictionary is freshly allocated without any elements, then it
// contains the empty singleton Storage which is returned as a toll-free
// implementation of `NSDictionary`.
//
// * If both `K` and `V` are bridged verbatim, then `Dictionary<K, V>` is
// still toll-free bridged to `NSDictionary` by returning its Storage.
//
// * If the Dictionary is actually a lazily bridged NSDictionary, then that
// NSDictionary is returned.
//
// * Otherwise, bridging the `Dictionary` is done by wrapping its buffer in a
// `_SwiftDeferredNSDictionary<K, V>`. This incurs an O(1)-sized allocation.
//
// Complete bridging of the native Storage's elements to another Storage
// is performed on first access. This is O(n) work, but is hopefully amortized
// by future accesses.
//
// This design ensures that:
// - Every time keys or values are accessed on the bridged `NSDictionary`,
// new objects are not created.
// - Accessing the same element (key or value) multiple times will return
// the same pointer.
//
// Bridging `NSSet` to `Set` and vice versa
// ----------------------------------------
//
// Bridging guarantees for `Set<Element>` are the same as for
// `Dictionary<Element, ()>`.
//
//===--- APIs unique to Dictionary<Key, Value> ----------------------------===//
/// A collection whose elements are key-value pairs.
///
/// A dictionary is a type of hash table, providing fast access to the entries
/// it contains. Each entry in the table is identified using its key, which is
/// a hashable type such as a string or number. You use that key to retrieve
/// the corresponding value, which can be any object. In other languages,
/// similar data types are known as hashes or associated arrays.
///
/// Create a new dictionary by using a dictionary literal. A dictionary literal
/// is a comma-separated list of key-value pairs, in which a colon separates
/// each key from its associated value, surrounded by square brackets. You can
/// assign a dictionary literal to a variable or constant or pass it to a
/// function that expects a dictionary.
///
/// Here's how you would create a dictionary of HTTP response codes and their
/// related messages:
///
/// var responseMessages = [200: "OK",
/// 403: "Access forbidden",
/// 404: "File not found",
/// 500: "Internal server error"]
///
/// The `responseMessages` variable is inferred to have type `[Int: String]`.
/// The `Key` type of the dictionary is `Int`, and the `Value` type of the
/// dictionary is `String`.
///
/// To create a dictionary with no key-value pairs, use an empty dictionary
/// literal (`[:]`).
///
/// var emptyDict: [String: String] = [:]
///
/// Any type that conforms to the `Hashable` protocol can be used as a
/// dictionary's `Key` type, including all of Swift's basic types. You can use
/// your own custom types as dictionary keys by making them conform to the
/// `Hashable` protocol.
///
/// Getting and Setting Dictionary Values
/// =====================================
///
/// The most common way to access values in a dictionary is to use a key as a
/// subscript. Subscripting with a key takes the following form:
///
/// print(responseMessages[200])
/// // Prints "Optional("OK")"
///
/// Subscripting a dictionary with a key returns an optional value, because a
/// dictionary might not hold a value for the key that you use in the
/// subscript.
///
/// The next example uses key-based subscripting of the `responseMessages`
/// dictionary with two keys that exist in the dictionary and one that does
/// not.
///
/// let httpResponseCodes = [200, 403, 301]
/// for code in httpResponseCodes {
/// if let message = responseMessages[code] {
/// print("Response \(code): \(message)")
/// } else {
/// print("Unknown response \(code)")
/// }
/// }
/// // Prints "Response 200: OK"
/// // Prints "Response 403: Access Forbidden"
/// // Prints "Unknown response 301"
///
/// You can also update, modify, or remove keys and values from a dictionary
/// using the key-based subscript. To add a new key-value pair, assign a value
/// to a key that isn't yet a part of the dictionary.
///
/// responseMessages[301] = "Moved permanently"
/// print(responseMessages[301])
/// // Prints "Optional("Moved permanently")"
///
/// Update an existing value by assigning a new value to a key that already
/// exists in the dictionary. If you assign `nil` to an existing key, the key
/// and its associated value are removed. The following example updates the
/// value for the `404` code to be simply "Not found" and removes the
/// key-value pair for the `500` code entirely.
///
/// responseMessages[404] = "Not found"
/// responseMessages[500] = nil
/// print(responseMessages)
/// // Prints "[301: "Moved permanently", 200: "OK", 403: "Access forbidden", 404: "Not found"]"
///
/// In a mutable `Dictionary` instance, you can modify in place a value that
/// you've accessed through a keyed subscript. The code sample below declares a
/// dictionary called `interestingNumbers` with string keys and values that
/// are integer arrays, then sorts each array in-place in descending order.
///
/// var interestingNumbers = ["primes": [2, 3, 5, 7, 11, 13, 17],
/// "triangular": [1, 3, 6, 10, 15, 21, 28],
/// "hexagonal": [1, 6, 15, 28, 45, 66, 91]]
/// for key in interestingNumbers.keys {
/// interestingNumbers[key]?.sort(by: >)
/// }
///
/// print(interestingNumbers["primes"]!)
/// // Prints "[17, 13, 11, 7, 5, 3, 2]"
///
/// Iterating Over the Contents of a Dictionary
/// ===========================================
///
/// Every dictionary is an unordered collection of key-value pairs. You can
/// iterate over a dictionary using a `for`-`in` loop, decomposing each
/// key-value pair into the elements of a tuple.
///
/// let imagePaths = ["star": "/glyphs/star.png",
/// "portrait": "/images/content/portrait.jpg",
/// "spacer": "/images/shared/spacer.gif"]
///
/// for (name, path) in imagePaths {
/// print("The path to '\(name)' is '\(path)'.")
/// }
/// // Prints "The path to 'star' is '/glyphs/star.png'."
/// // Prints "The path to 'portrait' is '/images/content/portrait.jpg'."
/// // Prints "The path to 'spacer' is '/images/shared/spacer.gif'."
///
/// The order of key-value pairs in a dictionary is stable between mutations
/// but is otherwise unpredictable. If you need an ordered collection of
/// key-value pairs and don't need the fast key lookup that `Dictionary`
/// provides, see the `DictionaryLiteral` type for an alternative.
///
/// You can search a dictionary's contents for a particular value using the
/// `contains(where:)` or `firstIndex(where:)` methods supplied by default
/// implementation. The following example checks to see if `imagePaths` contains
/// any paths in the `"/glyphs"` directory:
///
/// let glyphIndex = imagePaths.firstIndex(where: { $0.value.hasPrefix("/glyphs") })
/// if let index = glyphIndex {
/// print("The '\(imagesPaths[index].key)' image is a glyph.")
/// } else {
/// print("No glyphs found!")
/// }
/// // Prints "The 'star' image is a glyph.")
///
/// Note that in this example, `imagePaths` is subscripted using a dictionary
/// index. Unlike the key-based subscript, the index-based subscript returns
/// the corresponding key-value pair as a non-optional tuple.
///
/// print(imagePaths[glyphIndex!])
/// // Prints "("star", "/glyphs/star.png")"
///
/// A dictionary's indices stay valid across additions to the dictionary as
/// long as the dictionary has enough capacity to store the added values
/// without allocating more buffer. When a dictionary outgrows its buffer,
/// existing indices may be invalidated without any notification.
///
/// When you know how many new values you're adding to a dictionary, use the
/// `init(minimumCapacity:)` initializer to allocate the correct amount of
/// buffer.
///
/// Bridging Between Dictionary and NSDictionary
/// ============================================
///
/// You can bridge between `Dictionary` and `NSDictionary` using the `as`
/// operator. For bridging to be possible, the `Key` and `Value` types of a
/// dictionary must be classes, `@objc` protocols, or types that bridge to
/// Foundation types.
///
/// Bridging from `Dictionary` to `NSDictionary` always takes O(1) time and
/// space. When the dictionary's `Key` and `Value` types are neither classes
/// nor `@objc` protocols, any required bridging of elements occurs at the
/// first access of each element. For this reason, the first operation that
/// uses the contents of the dictionary may take O(*n*).
///
/// Bridging from `NSDictionary` to `Dictionary` first calls the `copy(with:)`
/// method (`- copyWithZone:` in Objective-C) on the dictionary to get an
/// immutable copy and then performs additional Swift bookkeeping work that
/// takes O(1) time. For instances of `NSDictionary` that are already
/// immutable, `copy(with:)` usually returns the same dictionary in O(1) time;
/// otherwise, the copying performance is unspecified. The instances of
/// `NSDictionary` and `Dictionary` share buffer using the same copy-on-write
/// optimization that is used when two instances of `Dictionary` share
/// buffer.
@_fixed_layout
public struct Dictionary<Key: Hashable, Value> {
@usableFromInline
internal typealias _Self = Dictionary<Key, Value>
@usableFromInline
internal typealias _VariantBuffer = _VariantDictionaryBuffer<Key, Value>
@usableFromInline
internal typealias _NativeBuffer = _NativeDictionaryBuffer<Key, Value>
/// The element type of a dictionary: a tuple containing an individual
/// key-value pair.
public typealias Element = (key: Key, value: Value)
@usableFromInline
internal var _variantBuffer: _VariantBuffer
/// Creates an empty dictionary.
@inlinable // FIXME(sil-serialize-all)
public init() {
self = Dictionary<Key, Value>(_nativeBuffer: _NativeBuffer())
}
/// Creates an empty dictionary with preallocated space for at least the
/// specified number of elements.
///
/// Use this initializer to avoid intermediate reallocations of a dictionary's
/// storage buffer when you know how many key-value pairs you are adding to a
/// dictionary after creation.
///
/// - Parameter minimumCapacity: The minimum number of key-value pairs that
/// the newly created dictionary should be able to store without
/// reallocating its storage buffer.
@inlinable // FIXME(sil-serialize-all)
public init(minimumCapacity: Int) {
_variantBuffer = .native(_NativeBuffer(minimumCapacity: minimumCapacity))
}
/// Creates a new dictionary from the key-value pairs in the given sequence.
///
/// You use this initializer to create a dictionary when you have a sequence
/// of key-value tuples with unique keys. Passing a sequence with duplicate
/// keys to this initializer results in a runtime error. If your
/// sequence might have duplicate keys, use the
/// `Dictionary(_:uniquingKeysWith:)` initializer instead.
///
/// The following example creates a new dictionary using an array of strings
/// as the keys and the integers in a countable range as the values:
///
/// let digitWords = ["one", "two", "three", "four", "five"]
/// let wordToValue = Dictionary(uniqueKeysWithValues: zip(digitWords, 1...5))
/// print(wordToValue["three"]!)
/// // Prints "3"
/// print(wordToValue)
/// // Prints "["three": 3, "four": 4, "five": 5, "one": 1, "two": 2]"
///
/// - Parameter keysAndValues: A sequence of key-value pairs to use for
/// the new dictionary. Every key in `keysAndValues` must be unique.
/// - Returns: A new dictionary initialized with the elements of
/// `keysAndValues`.
/// - Precondition: The sequence must not have duplicate keys.
@inlinable // FIXME(sil-serialize-all)
public init<S: Sequence>(
uniqueKeysWithValues keysAndValues: S
) where S.Element == (Key, Value) {
if let d = keysAndValues as? Dictionary<Key, Value> {
self = d
} else {
self = Dictionary(minimumCapacity: keysAndValues.underestimatedCount)
// '_MergeError.keyCollision' is caught and handled with an appropriate
// error message one level down, inside _variantBuffer.merge(_:...).
try! _variantBuffer.merge(
keysAndValues,
uniquingKeysWith: { _, _ in throw _MergeError.keyCollision})
}
}
/// Creates a new dictionary from the key-value pairs in the given sequence,
/// using a combining closure to determine the value for any duplicate keys.
///
/// You use this initializer to create a dictionary when you have a sequence
/// of key-value tuples that might have duplicate keys. As the dictionary is
/// built, the initializer calls the `combine` closure with the current and
/// new values for any duplicate keys. Pass a closure as `combine` that
/// returns the value to use in the resulting dictionary: The closure can
/// choose between the two values, combine them to produce a new value, or
/// even throw an error.
///
/// The following example shows how to choose the first and last values for
/// any duplicate keys:
///
/// let pairsWithDuplicateKeys = [("a", 1), ("b", 2), ("a", 3), ("b", 4)]
///
/// let firstValues = Dictionary(pairsWithDuplicateKeys,
/// uniquingKeysWith: { (first, _) in first })
/// // ["b": 2, "a": 1]
///
/// let lastValues = Dictionary(pairsWithDuplicateKeys,
/// uniquingKeysWith: { (_, last) in last })
/// // ["b": 4, "a": 3]
///
/// - Parameters:
/// - keysAndValues: A sequence of key-value pairs to use for the new
/// dictionary.
/// - combine: A closure that is called with the values for any duplicate
/// keys that are encountered. The closure returns the desired value for
/// the final dictionary.
@inlinable // FIXME(sil-serialize-all)
public init<S: Sequence>(
_ keysAndValues: S,
uniquingKeysWith combine: (Value, Value) throws -> Value
) rethrows where S.Element == (Key, Value) {
self = Dictionary(minimumCapacity: keysAndValues.underestimatedCount)
try _variantBuffer.merge(keysAndValues, uniquingKeysWith: combine)
}
/// Creates a new dictionary whose keys are the groupings returned by the
/// given closure and whose values are arrays of the elements that returned
/// each key.
///
/// The arrays in the "values" position of the new dictionary each contain at
/// least one element, with the elements in the same order as the source
/// sequence.
///
/// The following example declares an array of names, and then creates a
/// dictionary from that array by grouping the names by first letter:
///
/// let students = ["Kofi", "Abena", "Efua", "Kweku", "Akosua"]
/// let studentsByLetter = Dictionary(grouping: students, by: { $0.first! })
/// // ["E": ["Efua"], "K": ["Kofi", "Kweku"], "A": ["Abena", "Akosua"]]
///
/// The new `studentsByLetter` dictionary has three entries, with students'
/// names grouped by the keys `"E"`, `"K"`, and `"A"`.
///
/// - Parameters:
/// - values: A sequence of values to group into a dictionary.
/// - keyForValue: A closure that returns a key for each element in
/// `values`.
@inlinable // FIXME(sil-serialize-all)
public init<S: Sequence>(
grouping values: S,
by keyForValue: (S.Element) throws -> Key
) rethrows where Value == [S.Element] {
self = [:]
try _variantBuffer.nativeGroup(values, by: keyForValue)
}
@inlinable // FIXME(sil-serialize-all)
internal init(_nativeBuffer: _NativeDictionaryBuffer<Key, Value>) {
_variantBuffer =
.native(_nativeBuffer)
}
@inlinable // FIXME(sil-serialize-all)
internal init(_variantBuffer: _VariantBuffer) {
self._variantBuffer = _variantBuffer
}
#if _runtime(_ObjC)
/// Private initializer used for bridging.
///
/// Only use this initializer when both conditions are true:
///
/// * it is statically known that the given `NSDictionary` is immutable;
/// * `Key` and `Value` are bridged verbatim to Objective-C (i.e.,
/// are reference types).
@inlinable // FIXME(sil-serialize-all)
public init(_immutableCocoaDictionary: _NSDictionary) {
_sanityCheck(
_isBridgedVerbatimToObjectiveC(Key.self) &&
_isBridgedVerbatimToObjectiveC(Value.self),
"Dictionary can be backed by NSDictionary buffer only when both key and value are bridged verbatim to Objective-C")
_variantBuffer = .cocoa(
_CocoaDictionaryBuffer(cocoaDictionary: _immutableCocoaDictionary))
}
#endif
}
//
// All APIs below should dispatch to `_variantBuffer`, without doing any
// additional processing.
//
extension Dictionary: Sequence {
/// Returns an iterator over the dictionary's key-value pairs.
///
/// Iterating over a dictionary yields the key-value pairs as two-element
/// tuples. You can decompose the tuple in a `for`-`in` loop, which calls
/// `makeIterator()` behind the scenes, or when calling the iterator's
/// `next()` method directly.
///
/// let hues = ["Heliotrope": 296, "Coral": 16, "Aquamarine": 156]
/// for (name, hueValue) in hues {
/// print("The hue of \(name) is \(hueValue).")
/// }
/// // Prints "The hue of Heliotrope is 296."
/// // Prints "The hue of Coral is 16."
/// // Prints "The hue of Aquamarine is 156."
///
/// - Returns: An iterator over the dictionary with elements of type
/// `(key: Key, value: Value)`.
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
public func makeIterator() -> DictionaryIterator<Key, Value> {
return _variantBuffer.makeIterator()
}
}
// This is not quite Sequence.filter, because that returns [Element], not Self
extension Dictionary {
/// Returns a new dictionary containing the key-value pairs of the dictionary
/// that satisfy the given predicate.
///
/// - Parameter isIncluded: A closure that takes a key-value pair as its
/// argument and returns a Boolean value indicating whether the pair
/// should be included in the returned dictionary.
/// - Returns: A dictionary of the key-value pairs that `isIncluded` allows.
@inlinable
@available(swift, introduced: 4.0)
public func filter(
_ isIncluded: (Element) throws -> Bool
) rethrows -> [Key: Value] {
var result = Dictionary()
for el in self {
if try isIncluded(el) {
result[el.key] = el.value
}
}
return result
}
}
extension Dictionary: Collection {
/// The position of the first element in a nonempty dictionary.
///
/// If the collection is empty, `startIndex` is equal to `endIndex`.
///
/// - Complexity: Amortized O(1) if the dictionary does not wrap a bridged
/// `NSDictionary`. If the dictionary wraps a bridged `NSDictionary`, the
/// performance is unspecified.
@inlinable // FIXME(sil-serialize-all)
public var startIndex: Index {
return _variantBuffer.startIndex
}
/// The dictionary's "past the end" position---that is, the position one
/// greater than the last valid subscript argument.
///
/// If the collection is empty, `endIndex` is equal to `startIndex`.
///
/// - Complexity: Amortized O(1) if the dictionary does not wrap a bridged
/// `NSDictionary`; otherwise, the performance is unspecified.
@inlinable // FIXME(sil-serialize-all)
public var endIndex: Index {
return _variantBuffer.endIndex
}
@inlinable // FIXME(sil-serialize-all)
public func index(after i: Index) -> Index {
return _variantBuffer.index(after: i)
}
/// Returns the index for the given key.
///
/// If the given key is found in the dictionary, this method returns an index
/// into the dictionary that corresponds with the key-value pair.
///
/// let countryCodes = ["BR": "Brazil", "GH": "Ghana", "JP": "Japan"]
/// let index = countryCodes.index(forKey: "JP")
///
/// print("Country code for \(countryCodes[index!].value): '\(countryCodes[index!].key)'.")
/// // Prints "Country code for Japan: 'JP'."
///
/// - Parameter key: The key to find in the dictionary.
/// - Returns: The index for `key` and its associated value if `key` is in
/// the dictionary; otherwise, `nil`.
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
public func index(forKey key: Key) -> Index? {
// Complexity: amortized O(1) for native buffer, O(*n*) when wrapping an
// NSDictionary.
return _variantBuffer.index(forKey: key)
}
/// Accesses the key-value pair at the specified position.
///
/// This subscript takes an index into the dictionary, instead of a key, and
/// returns the corresponding key-value pair as a tuple. When performing
/// collection-based operations that return an index into a dictionary, use
/// this subscript with the resulting value.
///
/// For example, to find the key for a particular value in a dictionary, use
/// the `firstIndex(where:)` method.
///
/// let countryCodes = ["BR": "Brazil", "GH": "Ghana", "JP": "Japan"]
/// if let index = countryCodes.firstIndex(where: { $0.value == "Japan" }) {
/// print(countryCodes[index])
/// print("Japan's country code is '\(countryCodes[index].key)'.")
/// } else {
/// print("Didn't find 'Japan' as a value in the dictionary.")
/// }
/// // Prints "("JP", "Japan")"
/// // Prints "Japan's country code is 'JP'."
///
/// - Parameter position: The position of the key-value pair to access.
/// `position` must be a valid index of the dictionary and not equal to
/// `endIndex`.
/// - Returns: A two-element tuple with the key and value corresponding to
/// `position`.
@inlinable // FIXME(sil-serialize-all)
public subscript(position: Index) -> Element {
return _variantBuffer.assertingGet(position)
}
/// The number of key-value pairs in the dictionary.
///
/// - Complexity: O(1).
@inlinable // FIXME(sil-serialize-all)
public var count: Int {
return _variantBuffer.count
}
//
// `Sequence` conformance
//
/// A Boolean value that indicates whether the dictionary is empty.
///
/// Dictionaries are empty when created with an initializer or an empty
/// dictionary literal.
///
/// var frequencies: [String: Int] = [:]
/// print(frequencies.isEmpty)
/// // Prints "true"
@inlinable // FIXME(sil-serialize-all)
public var isEmpty: Bool {
return count == 0
}
}
extension Dictionary {
/// Accesses the value associated with the given key for reading and writing.
///
/// This *key-based* subscript returns the value for the given key if the key
/// is found in the dictionary, or `nil` if the key is not found.
///
/// The following example creates a new dictionary and prints the value of a
/// key found in the dictionary (`"Coral"`) and a key not found in the
/// dictionary (`"Cerise"`).
///
/// var hues = ["Heliotrope": 296, "Coral": 16, "Aquamarine": 156]
/// print(hues["Coral"])
/// // Prints "Optional(16)"
/// print(hues["Cerise"])
/// // Prints "nil"
///
/// When you assign a value for a key and that key already exists, the
/// dictionary overwrites the existing value. If the dictionary doesn't
/// contain the key, the key and value are added as a new key-value pair.
///
/// Here, the value for the key `"Coral"` is updated from `16` to `18` and a
/// new key-value pair is added for the key `"Cerise"`.
///
/// hues["Coral"] = 18
/// print(hues["Coral"])
/// // Prints "Optional(18)"
///
/// hues["Cerise"] = 330
/// print(hues["Cerise"])
/// // Prints "Optional(330)"
///
/// If you assign `nil` as the value for the given key, the dictionary
/// removes that key and its associated value.
///
/// In the following example, the key-value pair for the key `"Aquamarine"`
/// is removed from the dictionary by assigning `nil` to the key-based
/// subscript.
///
/// hues["Aquamarine"] = nil
/// print(hues)
/// // Prints "["Coral": 18, "Heliotrope": 296, "Cerise": 330]"
///
/// - Parameter key: The key to find in the dictionary.
/// - Returns: The value associated with `key` if `key` is in the dictionary;
/// otherwise, `nil`.
@inlinable // FIXME(sil-serialize-all)
public subscript(key: Key) -> Value? {
@inline(__always)
get {
return _variantBuffer.maybeGet(key)
}
set(newValue) {
if let x = newValue {
// FIXME(performance): this loads and discards the old value.
_variantBuffer.updateValue(x, forKey: key)
}
else {
// FIXME(performance): this loads and discards the old value.
removeValue(forKey: key)
}
}
}
}
extension Dictionary: ExpressibleByDictionaryLiteral {
/// Creates a dictionary initialized with a dictionary literal.
///
/// Do not call this initializer directly. It is called by the compiler to
/// handle dictionary literals. To use a dictionary literal as the initial
/// value of a dictionary, enclose a comma-separated list of key-value pairs
/// in square brackets.
///
/// For example, the code sample below creates a dictionary with string keys
/// and values.
///
/// let countryCodes = ["BR": "Brazil", "GH": "Ghana", "JP": "Japan"]
/// print(countryCodes)
/// // Prints "["BR": "Brazil", "JP": "Japan", "GH": "Ghana"]"
///
/// - Parameter elements: The key-value pairs that will make up the new
/// dictionary. Each key in `elements` must be unique.
@inlinable // FIXME(sil-serialize-all)
@_effects(readonly)
public init(dictionaryLiteral elements: (Key, Value)...) {
self.init(_nativeBuffer: _NativeDictionaryBuffer.fromArray(elements))
}
}
extension Dictionary {
/// Accesses the value with the given key. If the dictionary doesn't contain
/// the given key, accesses the provided default value as if the key and
/// default value existed in the dictionary.
///
/// Use this subscript when you want either the value for a particular key
/// or, when that key is not present in the dictionary, a default value. This
/// example uses the subscript with a message to use in case an HTTP response
/// code isn't recognized:
///
/// var responseMessages = [200: "OK",
/// 403: "Access forbidden",
/// 404: "File not found",
/// 500: "Internal server error"]
///
/// let httpResponseCodes = [200, 403, 301]
/// for code in httpResponseCodes {
/// let message = responseMessages[code, default: "Unknown response"]
/// print("Response \(code): \(message)")
/// }
/// // Prints "Response 200: OK"
/// // Prints "Response 403: Access Forbidden"
/// // Prints "Response 301: Unknown response"
///
/// When a dictionary's `Value` type has value semantics, you can use this
/// subscript to perform in-place operations on values in the dictionary.
/// The following example uses this subscript while counting the occurences
/// of each letter in a string:
///
/// let message = "Hello, Elle!"
/// var letterCounts: [Character: Int] = [:]
/// for letter in message {
/// letterCounts[letter, defaultValue: 0] += 1
/// }
/// // letterCounts == ["H": 1, "e": 2, "l": 4, "o": 1, ...]
///
/// When `letterCounts[letter, defaultValue: 0] += 1` is executed with a
/// value of `letter` that isn't already a key in `letterCounts`, the
/// specified default value (`0`) is returned from the subscript,
/// incremented, and then added to the dictionary under that key.
///
/// - Note: Do not use this subscript to modify dictionary values if the
/// dictionary's `Value` type is a class. In that case, the default value
/// and key are not written back to the dictionary after an operation.
///
/// - Parameters:
/// - key: The key the look up in the dictionary.
/// - defaultValue: The default value to use if `key` doesn't exist in the
/// dictionary.
/// - Returns: The value associated with `key` in the dictionary`; otherwise,
/// `defaultValue`.
@inlinable // FIXME(sil-serialize-all)
public subscript(
key: Key, default defaultValue: @autoclosure () -> Value
) -> Value {
@inline(__always)
get {
return _variantBuffer.maybeGet(key) ?? defaultValue()
}
mutableAddressWithNativeOwner {
let (_, address) = _variantBuffer
.pointerToValue(forKey: key, insertingDefault: defaultValue)
return (address, Builtin.castToNativeObject(
_variantBuffer.asNative._storage))
}
}
/// Returns a new dictionary containing the keys of this dictionary with the
/// values transformed by the given closure.
///
/// - Parameter transform: A closure that transforms a value. `transform`
/// accepts each value of the dictionary as its parameter and returns a
/// transformed value of the same or of a different type.
/// - Returns: A dictionary containing the keys and transformed values of
/// this dictionary.
@inlinable // FIXME(sil-serialize-all)
public func mapValues<T>(
_ transform: (Value) throws -> T
) rethrows -> Dictionary<Key, T> {
return try Dictionary<Key, T>(
_variantBuffer: _variantBuffer.mapValues(transform))
}
/// Returns a new dictionary containing the keys of this dictionary with the
/// values transformed by the given closure.
/// - Parameter transform: A closure that transforms a value. `transform`
/// accepts each value of the dictionary as its parameter and returns a
/// transformed value of the same or of a different type.
/// - Returns: A dictionary containing the keys and transformed values of
/// this dictionary.
@inlinable // FIXME(sil-serialize-all)
public func compactMapValues<T>(
_ transform: (Value) throws -> T?
) rethrows -> Dictionary<Key, T> {
return try self.reduce(into: [Key: T](), { (result, x) in
if let value = try transform(x.value) {
result[x.key] = value
}
})
}
/// Updates the value stored in the dictionary for the given key, or adds a
/// new key-value pair if the key does not exist.
///
/// Use this method instead of key-based subscripting when you need to know
/// whether the new value supplants the value of an existing key. If the
/// value of an existing key is updated, `updateValue(_:forKey:)` returns
/// the original value.
///
/// var hues = ["Heliotrope": 296, "Coral": 16, "Aquamarine": 156]
///
/// if let oldValue = hues.updateValue(18, forKey: "Coral") {
/// print("The old value of \(oldValue) was replaced with a new one.")
/// }
/// // Prints "The old value of 16 was replaced with a new one."
///
/// If the given key is not present in the dictionary, this method adds the
/// key-value pair and returns `nil`.
///
/// if let oldValue = hues.updateValue(330, forKey: "Cerise") {
/// print("The old value of \(oldValue) was replaced with a new one.")
/// } else {
/// print("No value was found in the dictionary for that key.")
/// }
/// // Prints "No value was found in the dictionary for that key."
///
/// - Parameters:
/// - value: The new value to add to the dictionary.
/// - key: The key to associate with `value`. If `key` already exists in
/// the dictionary, `value` replaces the existing associated value. If
/// `key` isn't already a key of the dictionary, the `(key, value)` pair
/// is added.
/// - Returns: The value that was replaced, or `nil` if a new key-value pair
/// was added.
@inlinable // FIXME(sil-serialize-all)
@discardableResult
public mutating func updateValue(
_ value: Value, forKey key: Key
) -> Value? {
return _variantBuffer.updateValue(value, forKey: key)
}
/// Merges the key-value pairs in the given sequence into the dictionary,
/// using a combining closure to determine the value for any duplicate keys.
///
/// Use the `combine` closure to select a value to use in the updated
/// dictionary, or to combine existing and new values. As the key-value
/// pairs are merged with the dictionary, the `combine` closure is called
/// with the current and new values for any duplicate keys that are
/// encountered.
///
/// This example shows how to choose the current or new values for any
/// duplicate keys:
///
/// var dictionary = ["a": 1, "b": 2]
///
/// // Keeping existing value for key "a":
/// dictionary.merge(zip(["a", "c"], [3, 4])) { (current, _) in current }
/// // ["b": 2, "a": 1, "c": 4]
///
/// // Taking the new value for key "a":
/// dictionary.merge(zip(["a", "d"], [5, 6])) { (_, new) in new }
/// // ["b": 2, "a": 5, "c": 4, "d": 6]
///
/// - Parameters:
/// - other: A sequence of key-value pairs.
/// - combine: A closure that takes the current and new values for any
/// duplicate keys. The closure returns the desired value for the final
/// dictionary.
@inlinable // FIXME(sil-serialize-all)
public mutating func merge<S: Sequence>(
_ other: S,
uniquingKeysWith combine: (Value, Value) throws -> Value
) rethrows where S.Element == (Key, Value) {
try _variantBuffer.merge(other, uniquingKeysWith: combine)
}
/// Merges the given dictionary into this dictionary, using a combining
/// closure to determine the value for any duplicate keys.
///
/// Use the `combine` closure to select a value to use in the updated
/// dictionary, or to combine existing and new values. As the key-values
/// pairs in `other` are merged with this dictionary, the `combine` closure
/// is called with the current and new values for any duplicate keys that
/// are encountered.
///
/// This example shows how to choose the current or new values for any
/// duplicate keys:
///
/// var dictionary = ["a": 1, "b": 2]
///
/// // Keeping existing value for key "a":
/// dictionary.merge(["a": 3, "c": 4]) { (current, _) in current }
/// // ["b": 2, "a": 1, "c": 4]
///
/// // Taking the new value for key "a":
/// dictionary.merge(["a": 5, "d": 6]) { (_, new) in new }
/// // ["b": 2, "a": 5, "c": 4, "d": 6]
///
/// - Parameters:
/// - other: A dictionary to merge.
/// - combine: A closure that takes the current and new values for any
/// duplicate keys. The closure returns the desired value for the final
/// dictionary.
@inlinable // FIXME(sil-serialize-all)
public mutating func merge(
_ other: [Key: Value],
uniquingKeysWith combine: (Value, Value) throws -> Value) rethrows
{
try _variantBuffer.merge(
other.lazy.map { ($0, $1) }, uniquingKeysWith: combine)
}
/// Creates a dictionary by merging key-value pairs in a sequence into the
/// dictionary, using a combining closure to determine the value for
/// duplicate keys.
///
/// Use the `combine` closure to select a value to use in the returned
/// dictionary, or to combine existing and new values. As the key-value
/// pairs are merged with the dictionary, the `combine` closure is called
/// with the current and new values for any duplicate keys that are
/// encountered.
///
/// This example shows how to choose the current or new values for any
/// duplicate keys:
///
/// let dictionary = ["a": 1, "b": 2]
/// let newKeyValues = zip(["a", "b"], [3, 4])
///
/// let keepingCurrent = dictionary.merging(newKeyValues) { (current, _) in current }
/// // ["b": 2, "a": 1]
/// let replacingCurrent = dictionary.merging(newKeyValues) { (_, new) in new }
/// // ["b": 4, "a": 3]
///
/// - Parameters:
/// - other: A sequence of key-value pairs.
/// - combine: A closure that takes the current and new values for any
/// duplicate keys. The closure returns the desired value for the final
/// dictionary.
/// - Returns: A new dictionary with the combined keys and values of this
/// dictionary and `other`.
@inlinable // FIXME(sil-serialize-all)
public func merging<S: Sequence>(
_ other: S,
uniquingKeysWith combine: (Value, Value) throws -> Value
) rethrows -> [Key: Value] where S.Element == (Key, Value) {
var result = self
try result._variantBuffer.merge(other, uniquingKeysWith: combine)
return result
}
/// Creates a dictionary by merging the given dictionary into this
/// dictionary, using a combining closure to determine the value for
/// duplicate keys.
///
/// Use the `combine` closure to select a value to use in the returned
/// dictionary, or to combine existing and new values. As the key-value
/// pairs in `other` are merged with this dictionary, the `combine` closure
/// is called with the current and new values for any duplicate keys that
/// are encountered.
///
/// This example shows how to choose the current or new values for any
/// duplicate keys:
///
/// let dictionary = ["a": 1, "b": 2]
/// let otherDictionary = ["a": 3, "b": 4]
///
/// let keepingCurrent = dictionary.merging(otherDictionary)
/// { (current, _) in current }
/// // ["b": 2, "a": 1]
/// let replacingCurrent = dictionary.merging(otherDictionary)
/// { (_, new) in new }
/// // ["b": 4, "a": 3]
///
/// - Parameters:
/// - other: A dictionary to merge.
/// - combine: A closure that takes the current and new values for any
/// duplicate keys. The closure returns the desired value for the final
/// dictionary.
/// - Returns: A new dictionary with the combined keys and values of this
/// dictionary and `other`.
@inlinable // FIXME(sil-serialize-all)
public func merging(
_ other: [Key: Value],
uniquingKeysWith combine: (Value, Value) throws -> Value
) rethrows -> [Key: Value] {
var result = self
try result.merge(other, uniquingKeysWith: combine)
return result
}
/// Removes and returns the key-value pair at the specified index.
///
/// Calling this method invalidates any existing indices for use with this
/// dictionary.
///
/// - Parameter index: The position of the key-value pair to remove. `index`
/// must be a valid index of the dictionary, and must not equal the
/// dictionary's end index.
/// - Returns: The key-value pair that correspond to `index`.
///
/// - Complexity: O(*n*), where *n* is the number of key-value pairs in the
/// dictionary.
@inlinable // FIXME(sil-serialize-all)
@discardableResult
public mutating func remove(at index: Index) -> Element {
return _variantBuffer.remove(at: index)
}
/// Removes the given key and its associated value from the dictionary.
///
/// If the key is found in the dictionary, this method returns the key's
/// associated value. On removal, this method invalidates all indices with
/// respect to the dictionary.
///
/// var hues = ["Heliotrope": 296, "Coral": 16, "Aquamarine": 156]
/// if let value = hues.removeValue(forKey: "Coral") {
/// print("The value \(value) was removed.")
/// }
/// // Prints "The value 16 was removed."
///
/// If the key isn't found in the dictionary, `removeValue(forKey:)` returns
/// `nil`.
///
/// if let value = hues.removeValueForKey("Cerise") {
/// print("The value \(value) was removed.")
/// } else {
/// print("No value found for that key.")
/// }
/// // Prints "No value found for that key.""
///
/// - Parameter key: The key to remove along with its associated value.
/// - Returns: The value that was removed, or `nil` if the key was not
/// present in the dictionary.
///
/// - Complexity: O(*n*), where *n* is the number of key-value pairs in the
/// dictionary.
@inlinable // FIXME(sil-serialize-all)
@discardableResult
public mutating func removeValue(forKey key: Key) -> Value? {
return _variantBuffer.removeValue(forKey: key)
}
/// Removes all key-value pairs from the dictionary.
///
/// Calling this method invalidates all indices with respect to the
/// dictionary.
///
/// - Parameter keepCapacity: Whether the dictionary should keep its
/// underlying buffer. If you pass `true`, the operation preserves the
/// buffer capacity that the collection has, otherwise the underlying
/// buffer is released. The default is `false`.
///
/// - Complexity: O(*n*), where *n* is the number of key-value pairs in the
/// dictionary.
@inlinable // FIXME(sil-serialize-all)
public mutating func removeAll(keepingCapacity keepCapacity: Bool = false) {
// The 'will not decrease' part in the documentation comment is worded very
// carefully. The capacity can increase if we replace Cocoa buffer with
// native buffer.
_variantBuffer.removeAll(keepingCapacity: keepCapacity)
}
}
extension Dictionary {
/// A collection containing just the keys of the dictionary.
///
/// When iterated over, keys appear in this collection in the same order as
/// they occur in the dictionary's key-value pairs. Each key in the keys
/// collection has a unique value.
///
/// let countryCodes = ["BR": "Brazil", "GH": "Ghana", "JP": "Japan"]
/// print(countryCodes)
/// // Prints "["BR": "Brazil", "JP": "Japan", "GH": "Ghana"]"
///
/// for k in countryCodes.keys {
/// print(k)
/// }
/// // Prints "BR"
/// // Prints "JP"
/// // Prints "GH"
@inlinable // FIXME(sil-serialize-all)
@available(swift, introduced: 4.0)
public var keys: Keys {
return Keys(self)
}
/// A collection containing just the values of the dictionary.
///
/// When iterated over, values appear in this collection in the same order as
/// they occur in the dictionary's key-value pairs.
///
/// let countryCodes = ["BR": "Brazil", "GH": "Ghana", "JP": "Japan"]
/// print(countryCodes)
/// // Prints "["BR": "Brazil", "JP": "Japan", "GH": "Ghana"]"
///
/// for v in countryCodes.values {
/// print(v)
/// }
/// // Prints "Brazil"
/// // Prints "Japan"
/// // Prints "Ghana"
@inlinable // FIXME(sil-serialize-all)
@available(swift, introduced: 4.0)
public var values: Values {
get {
return Values(self)
}
set {
self = Dictionary(_variantBuffer: newValue._variantBuffer)
}
}
/// A view of a dictionary's keys.
@_fixed_layout // FIXME(sil-serialize-all)
public struct Keys
: Collection, Equatable,
CustomStringConvertible, CustomDebugStringConvertible {
public typealias Element = Key
@usableFromInline // FIXME(sil-serialize-all)
internal var _variantBuffer: Dictionary._VariantBuffer
@inlinable // FIXME(sil-serialize-all)
internal init(_ _dictionary: Dictionary) {
self._variantBuffer = _dictionary._variantBuffer
}
// Collection Conformance
// ----------------------
@inlinable // FIXME(sil-serialize-all)
public var startIndex: Index {
return _variantBuffer.startIndex
}
@inlinable // FIXME(sil-serialize-all)
public var endIndex: Index {
return _variantBuffer.endIndex
}
@inlinable // FIXME(sil-serialize-all)
public func index(after i: Index) -> Index {
return _variantBuffer.index(after: i)
}
@inlinable // FIXME(sil-serialize-all)
public subscript(position: Index) -> Element {
return _variantBuffer.assertingGet(position).key
}
// Customization
// -------------
/// The number of keys in the dictionary.
///
/// - Complexity: O(1).
@inlinable // FIXME(sil-serialize-all)
public var count: Int {
return _variantBuffer.count
}
@inlinable // FIXME(sil-serialize-all)
public var isEmpty: Bool {
return count == 0
}
@inlinable // FIXME(sil-serialize-all)
public func _customContainsEquatableElement(_ element: Element) -> Bool? {
return _variantBuffer.containsKey(element)
}
@inlinable // FIXME(sil-serialize-all)
public func _customIndexOfEquatableElement(_ element: Element) -> Index?? {
return Optional(_variantBuffer.index(forKey: element))
}
@inlinable // FIXME(sil-serialize-all)
public func _customLastIndexOfEquatableElement(_ element: Element) -> Index?? {
// The first and last elements are the same because each element is unique.
return _customIndexOfEquatableElement(element)
}
@inlinable // FIXME(sil-serialize-all)
public static func ==(lhs: Keys, rhs: Keys) -> Bool {
// Equal if the two dictionaries share storage.
if case (.native(let lhsNative), .native(let rhsNative)) =
(lhs._variantBuffer, rhs._variantBuffer),
lhsNative._storage === rhsNative._storage {
return true
}
// Not equal if the dictionaries are different sizes.
if lhs.count != rhs.count {
return false
}
// Perform unordered comparison of keys.
for key in lhs {
if !rhs.contains(key) {
return false
}
}
return true
}
@inlinable // FIXME(sil-serialize-all)
public var description: String {
return _makeCollectionDescription(for: self, withTypeName: nil)
}
public var debugDescription: String {
return _makeCollectionDescription(for: self, withTypeName: "Dictionary.Keys")
}
}
/// A view of a dictionary's values.
@_fixed_layout // FIXME(sil-serialize-all)
public struct Values
: MutableCollection, CustomStringConvertible, CustomDebugStringConvertible {
public typealias Element = Value
@usableFromInline // FIXME(sil-serialize-all)
internal var _variantBuffer: Dictionary._VariantBuffer
@inlinable // FIXME(sil-serialize-all)
internal init(_ _dictionary: Dictionary) {
self._variantBuffer = _dictionary._variantBuffer
}
// Collection Conformance
// ----------------------
@inlinable // FIXME(sil-serialize-all)
public var startIndex: Index {
return _variantBuffer.startIndex
}
@inlinable // FIXME(sil-serialize-all)
public var endIndex: Index {
return _variantBuffer.endIndex
}
@inlinable // FIXME(sil-serialize-all)
public func index(after i: Index) -> Index {
return _variantBuffer.index(after: i)
}
@inlinable // FIXME(sil-serialize-all)
public subscript(position: Index) -> Element {
get {
return _variantBuffer.assertingGet(position).value
}
mutableAddressWithNativeOwner {
let address = _variantBuffer.pointerToValue(at: position)
return (address, Builtin.castToNativeObject(
_variantBuffer.asNative._storage))
}
}
// Customization
// -------------
/// The number of values in the dictionary.
///
/// - Complexity: O(1).
@inlinable // FIXME(sil-serialize-all)
public var count: Int {
return _variantBuffer.count
}
@inlinable // FIXME(sil-serialize-all)
public var isEmpty: Bool {
return count == 0
}
@inlinable // FIXME(sil-serialize-all)
public var description: String {
return _makeCollectionDescription(for: self, withTypeName: nil)
}
public var debugDescription: String {
return _makeCollectionDescription(for: self, withTypeName: "Dictionary.Values")
}
}
}
extension Dictionary: Equatable where Value: Equatable {
@inlinable // FIXME(sil-serialize-all)
public static func == (lhs: [Key: Value], rhs: [Key: Value]) -> Bool {
switch (lhs._variantBuffer, rhs._variantBuffer) {
case (.native(let lhsNative), .native(let rhsNative)):
if lhsNative._storage === rhsNative._storage {
return true
}
if lhsNative.count != rhsNative.count {
return false
}
for (k, v) in lhs {
let (pos, found) = rhsNative._find(k, startBucket: rhsNative._bucket(k))
// FIXME: Can't write the simple code pending
// <rdar://problem/15484639> Refcounting bug
/*
if !found || rhs[pos].value != lhsElement.value {
return false
}
*/
if !found {
return false
}
if rhsNative.value(at: pos.offset) != v {
return false
}
}
return true
#if _runtime(_ObjC)
case (.cocoa(let lhsCocoa), .cocoa(let rhsCocoa)):
return _stdlib_NSObject_isEqual(
lhsCocoa.cocoaDictionary, rhsCocoa.cocoaDictionary)
case (.native(let lhsNative), .cocoa(let rhsCocoa)):
if lhsNative.count != rhsCocoa.count {
return false
}
let endIndex = lhsNative.endIndex
var index = lhsNative.startIndex
while index != endIndex {
let (key, value) = lhsNative.assertingGet(index)
let optRhsValue: AnyObject? =
rhsCocoa.maybeGet(_bridgeAnythingToObjectiveC(key))
guard let rhsValue = optRhsValue,
value == _forceBridgeFromObjectiveC(rhsValue, Value.self)
else {
return false
}
lhsNative.formIndex(after: &index)
continue
}
return true
case (.cocoa, .native):
return rhs == lhs
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
public static func != (lhs: [Key: Value], rhs: [Key: Value]) -> Bool {
return !(lhs == rhs)
}
}
extension Dictionary: Hashable where Value: Hashable {
/// Hashes the essential components of this value by feeding them into the
/// given hasher.
///
/// - Parameter hasher: The hasher to use when combining the components
/// of this instance.
@inlinable
public func hash(into hasher: inout Hasher) {
var commutativeHash = 0
for (k, v) in self {
// Note that we use a copy of our own hasher here. This makes hash values
// dependent on its state, eliminating static collision patterns.
var elementHasher = hasher
elementHasher.combine(k)
elementHasher.combine(v)
commutativeHash ^= elementHasher._finalize()
}
hasher.combine(commutativeHash)
}
}
extension Dictionary: _HasCustomAnyHashableRepresentation
where Value: Hashable {
public func _toCustomAnyHashable() -> AnyHashable? {
return AnyHashable(_box: _DictionaryAnyHashableBox(self))
}
}
internal struct _DictionaryAnyHashableBox<Key: Hashable, Value: Hashable>
: _AnyHashableBox {
internal let _value: Dictionary<Key, Value>
internal let _canonical: Dictionary<AnyHashable, AnyHashable>
internal init(_ value: Dictionary<Key, Value>) {
self._value = value
self._canonical = value as Dictionary<AnyHashable, AnyHashable>
}
internal var _base: Any {
return _value
}
internal var _canonicalBox: _AnyHashableBox {
return _DictionaryAnyHashableBox<AnyHashable, AnyHashable>(_canonical)
}
internal func _isEqual(to other: _AnyHashableBox) -> Bool? {
guard
let other = other as? _DictionaryAnyHashableBox<AnyHashable, AnyHashable>
else {
return nil
}
return _canonical == other._value
}
internal var _hashValue: Int {
return _canonical.hashValue
}
internal func _hash(into hasher: inout Hasher) {
_canonical.hash(into: &hasher)
}
internal func _rawHashValue(_seed: (UInt64, UInt64)) -> Int {
return _canonical._rawHashValue(seed: _seed)
}
internal func _unbox<T: Hashable>() -> T? {
return _value as? T
}
internal func _downCastConditional<T>(
into result: UnsafeMutablePointer<T>
) -> Bool {
guard let value = _value as? T else { return false }
result.initialize(to: value)
return true
}
}
extension Dictionary: CustomStringConvertible, CustomDebugStringConvertible {
@inlinable // FIXME(sil-serialize-all)
internal func _makeDescription() -> String {
if count == 0 {
return "[:]"
}
var result = "["
var first = true
for (k, v) in self {
if first {
first = false
} else {
result += ", "
}
debugPrint(k, terminator: "", to: &result)
result += ": "
debugPrint(v, terminator: "", to: &result)
}
result += "]"
return result
}
/// A string that represents the contents of the dictionary.
@inlinable // FIXME(sil-serialize-all)
public var description: String {
return _makeDescription()
}
/// A string that represents the contents of the dictionary, suitable for
/// debugging.
public var debugDescription: String {
return _makeDescription()
}
}
@usableFromInline // FIXME(sil-serialize-all)
@_frozen // FIXME(sil-serialize-all)
internal enum _MergeError: Error {
case keyCollision
}
#if _runtime(_ObjC)
/// Equivalent to `NSDictionary.allKeys`, but does not leave objects on the
/// autorelease pool.
@inlinable // FIXME(sil-serialize-all)
internal func _stdlib_NSDictionary_allKeys(_ nsd: _NSDictionary)
-> _HeapBuffer<Int, AnyObject> {
let count = nsd.count
let storage = _HeapBuffer<Int, AnyObject>(
_HeapBufferStorage<Int, AnyObject>.self, count, count)
nsd.getObjects(nil, andKeys: storage.baseAddress, count: count)
return storage
}
#endif
//===--- Compiler conversion/casting entry points for Dictionary<K, V> ----===//
/// Perform a non-bridged upcast that always succeeds.
///
/// - Precondition: `BaseKey` and `BaseValue` are base classes or base `@objc`
/// protocols (such as `AnyObject`) of `DerivedKey` and `DerivedValue`,
/// respectively.
@inlinable // FIXME(sil-serialize-all)
public func _dictionaryUpCast<DerivedKey, DerivedValue, BaseKey, BaseValue>(
_ source: Dictionary<DerivedKey, DerivedValue>
) -> Dictionary<BaseKey, BaseValue> {
var result = Dictionary<BaseKey, BaseValue>(minimumCapacity: source.count)
for (k, v) in source {
result[k as! BaseKey] = (v as! BaseValue)
}
return result
}
#if _runtime(_ObjC)
/// Implements an unconditional upcast that involves bridging.
///
/// The cast can fail if bridging fails.
///
/// - Precondition: `SwiftKey` and `SwiftValue` are bridged to Objective-C,
/// and at least one of them requires non-trivial bridging.
@inline(never)
public func _dictionaryBridgeToObjectiveC<
SwiftKey, SwiftValue, ObjCKey, ObjCValue
>(
_ source: Dictionary<SwiftKey, SwiftValue>
) -> Dictionary<ObjCKey, ObjCValue> {
// Note: We force this function to stay in the swift dylib because
// it is not performance sensitive and keeping it in the dylib saves
// a new kilobytes for each specialization for all users of dictionary.
_sanityCheck(
!_isBridgedVerbatimToObjectiveC(SwiftKey.self) ||
!_isBridgedVerbatimToObjectiveC(SwiftValue.self))
_sanityCheck(
_isClassOrObjCExistential(ObjCKey.self) ||
_isClassOrObjCExistential(ObjCValue.self))
var result = Dictionary<ObjCKey, ObjCValue>(minimumCapacity: source.count)
let keyBridgesDirectly =
_isBridgedVerbatimToObjectiveC(SwiftKey.self) ==
_isBridgedVerbatimToObjectiveC(ObjCKey.self)
let valueBridgesDirectly =
_isBridgedVerbatimToObjectiveC(SwiftValue.self) ==
_isBridgedVerbatimToObjectiveC(ObjCValue.self)
for (key, value) in source {
// Bridge the key
var bridgedKey: ObjCKey
if keyBridgesDirectly {
bridgedKey = unsafeBitCast(key, to: ObjCKey.self)
} else {
let bridged: AnyObject = _bridgeAnythingToObjectiveC(key)
bridgedKey = unsafeBitCast(bridged, to: ObjCKey.self)
}
// Bridge the value
var bridgedValue: ObjCValue
if valueBridgesDirectly {
bridgedValue = unsafeBitCast(value, to: ObjCValue.self)
} else {
let bridged: AnyObject? = _bridgeAnythingToObjectiveC(value)
bridgedValue = unsafeBitCast(bridged, to: ObjCValue.self)
}
result[bridgedKey] = bridgedValue
}
return result
}
#endif
/// Called by the casting machinery.
@_silgen_name("_swift_dictionaryDownCastIndirect")
internal func _dictionaryDownCastIndirect<SourceKey, SourceValue,
TargetKey, TargetValue>(
_ source: UnsafePointer<Dictionary<SourceKey, SourceValue>>,
_ target: UnsafeMutablePointer<Dictionary<TargetKey, TargetValue>>) {
target.initialize(to: _dictionaryDownCast(source.pointee))
}
/// Implements a forced downcast. This operation should have O(1) complexity.
///
/// The cast can fail if bridging fails. The actual checks and bridging can be
/// deferred.
///
/// - Precondition: `DerivedKey` is a subtype of `BaseKey`, `DerivedValue` is
/// a subtype of `BaseValue`, and all of these types are reference types.
@inlinable // FIXME(sil-serialize-all)
public func _dictionaryDownCast<BaseKey, BaseValue, DerivedKey, DerivedValue>(
_ source: Dictionary<BaseKey, BaseValue>
) -> Dictionary<DerivedKey, DerivedValue> {
#if _runtime(_ObjC)
if _isClassOrObjCExistential(BaseKey.self)
&& _isClassOrObjCExistential(BaseValue.self)
&& _isClassOrObjCExistential(DerivedKey.self)
&& _isClassOrObjCExistential(DerivedValue.self) {
switch source._variantBuffer {
case .native(let buffer):
// Note: it is safe to treat the buffer as immutable here because
// Dictionary will not mutate buffer with reference count greater than 1.
return Dictionary(_immutableCocoaDictionary: buffer.bridged())
case .cocoa(let cocoaBuffer):
return Dictionary(_immutableCocoaDictionary: cocoaBuffer.cocoaDictionary)
}
}
#endif
return _dictionaryDownCastConditional(source)!
}
/// Called by the casting machinery.
@_silgen_name("_swift_dictionaryDownCastConditionalIndirect")
internal func _dictionaryDownCastConditionalIndirect<SourceKey, SourceValue,
TargetKey, TargetValue>(
_ source: UnsafePointer<Dictionary<SourceKey, SourceValue>>,
_ target: UnsafeMutablePointer<Dictionary<TargetKey, TargetValue>>
) -> Bool {
if let result: Dictionary<TargetKey, TargetValue>
= _dictionaryDownCastConditional(source.pointee) {
target.initialize(to: result)
return true
}
return false
}
/// Implements a conditional downcast.
///
/// If the cast fails, the function returns `nil`. All checks should be
/// performed eagerly.
///
/// - Precondition: `DerivedKey` is a subtype of `BaseKey`, `DerivedValue` is
/// a subtype of `BaseValue`, and all of these types are reference types.
@inlinable // FIXME(sil-serialize-all)
public func _dictionaryDownCastConditional<
BaseKey, BaseValue, DerivedKey, DerivedValue
>(
_ source: Dictionary<BaseKey, BaseValue>
) -> Dictionary<DerivedKey, DerivedValue>? {
var result = Dictionary<DerivedKey, DerivedValue>()
for (k, v) in source {
guard let k1 = k as? DerivedKey, let v1 = v as? DerivedValue
else { return nil }
result[k1] = v1
}
return result
}
#if _runtime(_ObjC)
/// Implements an unconditional downcast that involves bridging.
///
/// - Precondition: At least one of `SwiftKey` or `SwiftValue` is a bridged value
/// type, and the corresponding `ObjCKey` or `ObjCValue` is a reference type.
@inlinable // FIXME(sil-serialize-all)
public func _dictionaryBridgeFromObjectiveC<
ObjCKey, ObjCValue, SwiftKey, SwiftValue
>(
_ source: Dictionary<ObjCKey, ObjCValue>
) -> Dictionary<SwiftKey, SwiftValue> {
let result: Dictionary<SwiftKey, SwiftValue>? =
_dictionaryBridgeFromObjectiveCConditional(source)
_precondition(result != nil, "Dictionary cannot be bridged from Objective-C")
return result!
}
/// Implements a conditional downcast that involves bridging.
///
/// If the cast fails, the function returns `nil`. All checks should be
/// performed eagerly.
///
/// - Precondition: At least one of `SwiftKey` or `SwiftValue` is a bridged value
/// type, and the corresponding `ObjCKey` or `ObjCValue` is a reference type.
@inlinable // FIXME(sil-serialize-all)
public func _dictionaryBridgeFromObjectiveCConditional<
ObjCKey, ObjCValue, SwiftKey, SwiftValue
>(
_ source: Dictionary<ObjCKey, ObjCValue>
) -> Dictionary<SwiftKey, SwiftValue>? {
_sanityCheck(
_isClassOrObjCExistential(ObjCKey.self) ||
_isClassOrObjCExistential(ObjCValue.self))
_sanityCheck(
!_isBridgedVerbatimToObjectiveC(SwiftKey.self) ||
!_isBridgedVerbatimToObjectiveC(SwiftValue.self))
let keyBridgesDirectly =
_isBridgedVerbatimToObjectiveC(SwiftKey.self) ==
_isBridgedVerbatimToObjectiveC(ObjCKey.self)
let valueBridgesDirectly =
_isBridgedVerbatimToObjectiveC(SwiftValue.self) ==
_isBridgedVerbatimToObjectiveC(ObjCValue.self)
var result = Dictionary<SwiftKey, SwiftValue>(minimumCapacity: source.count)
for (key, value) in source {
// Downcast the key.
var resultKey: SwiftKey
if keyBridgesDirectly {
if let bridgedKey = key as? SwiftKey {
resultKey = bridgedKey
} else {
return nil
}
} else {
if let bridgedKey = _conditionallyBridgeFromObjectiveC(
_reinterpretCastToAnyObject(key), SwiftKey.self) {
resultKey = bridgedKey
} else {
return nil
}
}
// Downcast the value.
var resultValue: SwiftValue
if valueBridgesDirectly {
if let bridgedValue = value as? SwiftValue {
resultValue = bridgedValue
} else {
return nil
}
} else {
if let bridgedValue = _conditionallyBridgeFromObjectiveC(
_reinterpretCastToAnyObject(value), SwiftValue.self) {
resultValue = bridgedValue
} else {
return nil
}
}
result[resultKey] = resultValue
}
return result
}
#endif
//===--- APIs templated for Dictionary and Set ----------------------------===//
/// An instance of this class has all `Dictionary` data tail-allocated.
/// Enough bytes are allocated to hold the bitmap for marking valid entries,
/// keys, and values. The data layout starts with the bitmap, followed by the
/// keys, followed by the values.
//
// See the docs at the top of the file for more details on this type
//
// NOTE: The precise layout of this type is relied on in the runtime
// to provide a statically allocated empty singleton.
// See stdlib/public/stubs/GlobalObjects.cpp for details.
@_fixed_layout // FIXME(sil-serialize-all)
@usableFromInline // FIXME(sil-serialize-all)
@_objc_non_lazy_realization
internal class _RawNativeDictionaryStorage
: _SwiftNativeNSDictionary, _NSDictionaryCore
{
@usableFromInline
internal typealias RawStorage = _RawNativeDictionaryStorage
@usableFromInline // FIXME(sil-serialize-all)
@nonobjc
internal final var bucketCount: Int
@usableFromInline // FIXME(sil-serialize-all)
internal final var count: Int
@usableFromInline // FIXME(sil-serialize-all)
internal final var initializedEntries: _UnsafeBitMap
@usableFromInline // FIXME(sil-serialize-all)
@nonobjc
internal final var keys: UnsafeMutableRawPointer
@usableFromInline // FIXME(sil-serialize-all)
@nonobjc
internal final var values: UnsafeMutableRawPointer
@usableFromInline // FIXME(sil-serialize-all)
internal final var seed: (UInt64, UInt64)
// This API is unsafe and needs a `_fixLifetime` in the caller.
@inlinable // FIXME(sil-serialize-all)
@nonobjc
internal final
var _initializedHashtableEntriesBitMapBuffer: UnsafeMutablePointer<UInt> {
return UnsafeMutablePointer(Builtin.projectTailElems(self, UInt.self))
}
/// The empty singleton that is used for every single Dictionary that is
/// created without any elements. The contents of the storage should never
/// be mutated.
@inlinable // FIXME(sil-serialize-all)
@nonobjc
internal static var empty: RawStorage {
return Builtin.bridgeFromRawPointer(
Builtin.addressof(&_swiftEmptyDictionaryStorage))
}
// This type is made with allocWithTailElems, so no init is ever called.
// But we still need to have an init to satisfy the compiler.
@inlinable // FIXME(sil-serialize-all)
@nonobjc
internal init(_doNotCallMe: ()) {
_sanityCheckFailure("Only create this by using the `empty` singleton")
}
#if _runtime(_ObjC)
//
// NSDictionary implementation, assuming Self is the empty singleton
//
/// Get the NSEnumerator implementation for self.
/// _HashableTypedNativeDictionaryStorage overloads this to give
/// _NativeSelfNSEnumerator proper type parameters.
@inlinable // FIXME(sil-serialize-all)
@objc
internal func enumerator() -> _NSEnumerator {
return _NativeDictionaryNSEnumerator<AnyObject, AnyObject>(
_NativeDictionaryBuffer(_storage: self))
}
@inlinable // FIXME(sil-serialize-all)
@objc(copyWithZone:)
internal func copy(with zone: _SwiftNSZone?) -> AnyObject {
return self
}
@inlinable // FIXME(sil-serialize-all)
@objc(countByEnumeratingWithState:objects:count:)
internal func countByEnumerating(
with state: UnsafeMutablePointer<_SwiftNSFastEnumerationState>,
objects: UnsafeMutablePointer<AnyObject>?, count: Int
) -> Int {
// Even though we never do anything in here, we need to update the
// state so that callers know we actually ran.
var theState = state.pointee
if theState.state == 0 {
theState.state = 1 // Arbitrary non-zero value.
theState.itemsPtr = AutoreleasingUnsafeMutablePointer(objects)
theState.mutationsPtr = _fastEnumerationStorageMutationsPtr
}
state.pointee = theState
return 0
}
@inlinable // FIXME(sil-serialize-all)
@objc
internal required init(
objects: UnsafePointer<AnyObject?>,
forKeys: UnsafeRawPointer,
count: Int
) {
_sanityCheckFailure("don't call this designated initializer")
}
@inlinable // FIXME(sil-serialize-all)
@objc(objectForKey:)
internal func objectFor(_ aKey: AnyObject) -> AnyObject? {
return nil
}
@inlinable // FIXME(sil-serialize-all)
internal func keyEnumerator() -> _NSEnumerator {
return enumerator()
}
@inlinable // FIXME(sil-serialize-all)
@objc(getObjects:andKeys:count:)
internal func getObjects(
_ objects: UnsafeMutablePointer<AnyObject>?,
andKeys keys: UnsafeMutablePointer<AnyObject>?,
count: Int) {
// Do nothing, we're empty
}
#endif
}
// See the docs at the top of this file for a description of this type
@_fixed_layout // FIXME(sil-serialize-all)
@usableFromInline
internal class _TypedNativeDictionaryStorage<Key, Value>
: _RawNativeDictionaryStorage {
deinit {
let keys = self.keys.assumingMemoryBound(to: Key.self)
let values = self.values.assumingMemoryBound(to: Value.self)
if !_isPOD(Key.self) {
for i in 0 ..< bucketCount {
if initializedEntries[i] {
(keys+i).deinitialize(count: 1)
}
}
}
if !_isPOD(Value.self) {
for i in 0 ..< bucketCount {
if initializedEntries[i] {
(values+i).deinitialize(count: 1)
}
}
}
_fixLifetime(self)
}
// This type is made with allocWithTailElems, so no init is ever called.
// But we still need to have an init to satisfy the compiler.
@inlinable // FIXME(sil-serialize-all)
@nonobjc
override internal init(_doNotCallMe: ()) {
_sanityCheckFailure("Only create this by calling Buffer's inits")
}
#if _runtime(_ObjC)
@inlinable // FIXME(sil-serialize-all)
@objc
internal required init(
objects: UnsafePointer<AnyObject?>,
forKeys: UnsafeRawPointer,
count: Int
) {
_sanityCheckFailure("don't call this designated initializer")
}
#endif
}
// See the docs at the top of this file for a description of this type
@_fixed_layout // FIXME(sil-serialize-all)
@usableFromInline
final internal class _HashableTypedNativeDictionaryStorage<Key: Hashable, Value>
: _TypedNativeDictionaryStorage<Key, Value> {
@usableFromInline
internal typealias FullContainer = Dictionary<Key, Value>
@usableFromInline
internal typealias Buffer = _NativeDictionaryBuffer<Key, Value>
// This type is made with allocWithTailElems, so no init is ever called.
// But we still need to have an init to satisfy the compiler.
@inlinable // FIXME(sil-serialize-all)
@nonobjc
override internal init(_doNotCallMe: ()) {
_sanityCheckFailure("Only create this by calling Buffer's inits'")
}
#if _runtime(_ObjC)
// NSDictionary bridging:
// All actual functionality comes from buffer/full, which are
// just wrappers around a RawNativeDictionaryStorage.
@inlinable // FIXME(sil-serialize-all)
internal var buffer: Buffer {
return Buffer(_storage: self)
}
@inlinable // FIXME(sil-serialize-all)
internal var full: FullContainer {
return FullContainer(_nativeBuffer: buffer)
}
@inlinable // FIXME(sil-serialize-all)
internal override func enumerator() -> _NSEnumerator {
return _NativeDictionaryNSEnumerator<Key, Value>(
Buffer(_storage: self))
}
@inlinable // FIXME(sil-serialize-all)
@objc(countByEnumeratingWithState:objects:count:)
internal override 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
theState.extra.0 = CUnsignedLong(full.startIndex._nativeIndex.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 currIndex = _NativeDictionaryIndex<Key, Value>(
offset: Int(theState.extra.0))
let endIndex = buffer.endIndex
var stored = 0
for i in 0..<count {
if (currIndex == endIndex) {
break
}
unmanagedObjects[i] = buffer.bridgedKey(at: currIndex)
stored += 1
buffer.formIndex(after: &currIndex)
}
theState.extra.0 = CUnsignedLong(currIndex.offset)
state.pointee = theState
return stored
}
@inlinable // FIXME(sil-serialize-all)
@nonobjc
internal func getObjectFor(_ aKey: AnyObject) -> AnyObject? {
guard let nativeKey = _conditionallyBridgeFromObjectiveC(aKey, Key.self)
else { return nil }
let (i, found) = buffer._find(nativeKey,
startBucket: buffer._bucket(nativeKey))
if found {
return buffer.bridgedValue(at: i)
}
return nil
}
@inlinable // FIXME(sil-serialize-all)
@objc
internal required init(
objects: UnsafePointer<AnyObject?>,
forKeys: UnsafeRawPointer,
count: Int
) {
_sanityCheckFailure("don't call this designated initializer")
}
@inlinable // FIXME(sil-serialize-all)
@objc(objectForKey:)
override func objectFor(_ aKey: AnyObject) -> AnyObject? {
return getObjectFor(aKey)
}
// We also override the following methods for efficiency.
@inlinable // FIXME(sil-serialize-all)
@objc(getObjects:andKeys:count:)
override func getObjects(
_ objects: UnsafeMutablePointer<AnyObject>?,
andKeys keys: UnsafeMutablePointer<AnyObject>?,
count: Int) {
_precondition(count >= 0, "Invalid count")
guard count > 0 else { return }
var i = 0 // Current position in the output buffers
if let unmanagedKeys = _UnmanagedAnyObjectArray(keys) {
if let unmanagedObjects = _UnmanagedAnyObjectArray(objects) {
// keys nonnull, objects nonnull
for (key, value) in full {
unmanagedObjects[i] = _bridgeAnythingToObjectiveC(value)
unmanagedKeys[i] = _bridgeAnythingToObjectiveC(key)
i += 1
guard i < count else { break }
}
} else {
// keys nonnull, objects null
for (key, _) in full {
unmanagedKeys[i] = _bridgeAnythingToObjectiveC(key)
i += 1
guard i < count else { break }
}
}
} else {
if let unmanagedObjects = _UnmanagedAnyObjectArray(objects) {
// keys null, objects nonnull
for (_, value) in full {
unmanagedObjects[i] = _bridgeAnythingToObjectiveC(value)
i += 1
guard i < count else { break }
}
} else {
// do nothing, both are null
}
}
}
#endif
}
/// A wrapper around _RawNativeDictionaryStorage that provides most of the
/// implementation of Dictionary.
///
/// This type and most of its functionality doesn't require Hashable at all.
/// The reason for this is to support storing AnyObject for bridging
/// with _SwiftDeferredNSDictionary. What functionality actually relies on
/// Hashable can be found in an extension.
@usableFromInline
@_fixed_layout
internal struct _NativeDictionaryBuffer<Key, Value> {
@usableFromInline // FIXME(sil-serialize-all)
internal typealias RawStorage = _RawNativeDictionaryStorage
@usableFromInline // FIXME(sil-serialize-all)
internal typealias TypedStorage = _TypedNativeDictionaryStorage<Key, Value>
@usableFromInline // FIXME(sil-serialize-all)
internal typealias Buffer = _NativeDictionaryBuffer<Key, Value>
@usableFromInline // FIXME(sil-serialize-all)
internal typealias Index = _NativeDictionaryIndex<Key, Value>
@usableFromInline
internal typealias SequenceElementWithoutLabels = (Key, Value)
/// See this comments on _RawNativeDictionaryStorage and its subclasses to
/// understand why we store an untyped storage here.
@usableFromInline // FIXME(sil-serialize-all)
internal var _storage: RawStorage
/// Creates a Buffer with a storage that is typed, but doesn't understand
/// Hashing. Mostly for bridging; prefer `init(minimumCapacity:)`.
@inlinable // FIXME(sil-serialize-all)
internal init(_exactBucketCount bucketCount: Int, unhashable: ()) {
let bitmapWordCount = _UnsafeBitMap.sizeInWords(forSizeInBits: bucketCount)
let storage = Builtin.allocWithTailElems_3(TypedStorage.self,
bitmapWordCount._builtinWordValue, UInt.self,
bucketCount._builtinWordValue, Key.self,
bucketCount._builtinWordValue, Value.self)
self.init(_exactBucketCount: bucketCount, storage: storage)
}
/// Given a bucket count and uninitialized RawStorage, completes the
/// initialization and returns a Buffer.
@inlinable // FIXME(sil-serialize-all)
internal init(_exactBucketCount bucketCount: Int, storage: RawStorage) {
storage.bucketCount = bucketCount
storage.count = 0
self.init(_storage: storage)
let initializedEntries = _UnsafeBitMap(
storage: _initializedHashtableEntriesBitMapBuffer,
bitCount: bucketCount)
initializedEntries.initializeToZero()
// Compute all the array offsets now, so we don't have to later
let bitmapAddr = Builtin.projectTailElems(_storage, UInt.self)
let bitmapWordCount = _UnsafeBitMap.sizeInWords(forSizeInBits: bucketCount)
let keysAddr = Builtin.getTailAddr_Word(bitmapAddr,
bitmapWordCount._builtinWordValue, UInt.self, Key.self)
// Initialize header
_storage.initializedEntries = initializedEntries
_storage.keys = UnsafeMutableRawPointer(keysAddr)
let valuesAddr = Builtin.getTailAddr_Word(keysAddr,
bucketCount._builtinWordValue, Key.self, Value.self)
_storage.values = UnsafeMutableRawPointer(valuesAddr)
// We assign a unique hash seed to each distinct hash table size, so that we
// avoid certain copy operations becoming quadratic, without breaking value
// semantics. (See https://bugs.swift.org/browse/SR-3268)
//
// We don't need to generate a brand new seed for each table size: it's
// enough to change a single bit in the global seed by XORing the bucket
// count to it. (The bucket count is always a power of two.)
//
// FIXME: Use an approximation of true per-instance seeding. We can't just
// use the base address, because COW copies need to share the same seed.
let seed = Hasher._seed
let perturbation = bucketCount
_storage.seed = (seed.0 ^ UInt64(truncatingIfNeeded: perturbation), seed.1)
}
// Forwarding the individual fields of the storage in various forms
@inlinable // FIXME(sil-serialize-all)
internal var bucketCount: Int {
return _assumeNonNegative(_storage.bucketCount)
}
@inlinable // FIXME(sil-serialize-all)
internal var count: Int {
set {
_storage.count = newValue
}
get {
return _assumeNonNegative(_storage.count)
}
}
@inlinable // FIXME(sil-serialize-all)
internal
var _initializedHashtableEntriesBitMapBuffer: UnsafeMutablePointer<UInt> {
return _storage._initializedHashtableEntriesBitMapBuffer
}
// This API is unsafe and needs a `_fixLifetime` in the caller.
@inlinable // FIXME(sil-serialize-all)
internal var keys: UnsafeMutablePointer<Key> {
return _storage.keys.assumingMemoryBound(to: Key.self)
}
// This API is unsafe and needs a `_fixLifetime` in the caller.
@inlinable // FIXME(sil-serialize-all)
internal var values: UnsafeMutablePointer<Value> {
return _storage.values.assumingMemoryBound(to: Value.self)
}
/// Constructs a buffer adopting the given storage.
@inlinable // FIXME(sil-serialize-all)
internal init(_storage: RawStorage) {
self._storage = _storage
}
/// Constructs an instance from the empty singleton.
@inlinable // FIXME(sil-serialize-all)
internal init() {
self._storage = RawStorage.empty
}
// Most of the implementation of the _HashBuffer protocol,
// but only the parts that don't actually rely on hashing.
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
internal func key(at i: Int) -> Key {
_sanityCheck(i >= 0 && i < bucketCount)
_sanityCheck(isInitializedEntry(at: i))
defer { _fixLifetime(self) }
let res = (keys + i).pointee
return res
}
#if _runtime(_ObjC)
/// Returns the key at the given Index, bridged.
///
/// Intended for use with verbatim bridgeable keys.
@inlinable // FIXME(sil-serialize-all)
internal func bridgedKey(at index: Index) -> AnyObject {
let k = key(at: index.offset)
return _bridgeAnythingToObjectiveC(k)
}
/// Returns the value at the given Index, bridged.
///
/// Intended for use with verbatim bridgeable keys.
@inlinable // FIXME(sil-serialize-all)
internal func bridgedValue(at index: Index) -> AnyObject {
let v = value(at: index.offset)
return _bridgeAnythingToObjectiveC(v)
}
#endif
@inlinable // FIXME(sil-serialize-all)
internal func isInitializedEntry(at i: Int) -> Bool {
_sanityCheck(i >= 0 && i < bucketCount)
defer { _fixLifetime(self) }
return _storage.initializedEntries[i]
}
@usableFromInline @_transparent
internal func destroyEntry(at i: Int) {
_sanityCheck(isInitializedEntry(at: i))
defer { _fixLifetime(self) }
(keys + i).deinitialize(count: 1)
(values + i).deinitialize(count: 1)
_storage.initializedEntries[i] = false
}
@usableFromInline @_transparent
internal func initializeKey(_ k: Key, value v: Value, at i: Int) {
_sanityCheck(!isInitializedEntry(at: i))
defer { _fixLifetime(self) }
(keys + i).initialize(to: k)
(values + i).initialize(to: v)
_storage.initializedEntries[i] = true
}
@usableFromInline @_transparent
internal func moveInitializeEntry(from: Buffer, at: Int, toEntryAt: Int) {
_sanityCheck(!isInitializedEntry(at: toEntryAt))
defer { _fixLifetime(self) }
(keys + toEntryAt).initialize(to: (from.keys + at).move())
(values + toEntryAt).initialize(to: (from.values + at).move())
from._storage.initializedEntries[at] = false
_storage.initializedEntries[toEntryAt] = true
}
@usableFromInline @_transparent
internal func value(at i: Int) -> Value {
_sanityCheck(isInitializedEntry(at: i))
defer { _fixLifetime(self) }
return (values + i).pointee
}
@usableFromInline @_transparent
internal func setKey(_ key: Key, value: Value, at i: Int) {
_sanityCheck(isInitializedEntry(at: i))
defer { _fixLifetime(self) }
(keys + i).pointee = key
(values + i).pointee = value
}
@inlinable // FIXME(sil-serialize-all)
internal var startIndex: Index {
// We start at "index after -1" instead of "0" because we need to find the
// first occupied slot.
return index(after: Index(offset: -1))
}
@inlinable // FIXME(sil-serialize-all)
internal var endIndex: Index {
return Index(offset: bucketCount)
}
@inlinable // FIXME(sil-serialize-all)
internal func index(after i: Index) -> Index {
_precondition(i != endIndex)
var idx = i.offset + 1
while idx < bucketCount && !isInitializedEntry(at: idx) {
idx += 1
}
return Index(offset: idx)
}
@inlinable // FIXME(sil-serialize-all)
internal func formIndex(after i: inout Index) {
i = index(after: i)
}
@inlinable // FIXME(sil-serialize-all)
internal func assertingGet(_ i: Index) -> SequenceElement {
_precondition(i.offset >= 0 && i.offset < bucketCount)
_precondition(
isInitializedEntry(at: i.offset),
"Attempting to access Dictionary elements using an invalid Index")
let key = self.key(at: i.offset)
return (key, self.value(at: i.offset))
}
}
extension _NativeDictionaryBuffer where Key: Hashable
{
@usableFromInline
internal typealias HashTypedStorage =
_HashableTypedNativeDictionaryStorage<Key, Value>
@usableFromInline
internal typealias SequenceElement = (key: Key, value: Value)
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
internal init(minimumCapacity: Int) {
let bucketCount = _NativeDictionaryBuffer.bucketCount(
forCapacity: minimumCapacity,
maxLoadFactorInverse: _hashContainerDefaultMaxLoadFactorInverse)
self.init(bucketCount: bucketCount)
}
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
internal init(bucketCount: Int) {
// Actual bucket count is the next power of 2 greater than or equal to
// bucketCount. Make sure that is representable.
_sanityCheck(bucketCount <= (Int.max >> 1) + 1)
let buckets = 1 &<< ((Swift.max(bucketCount, 2) - 1)._binaryLogarithm() + 1)
self.init(_exactBucketCount: buckets)
}
/// Create a buffer instance with room for at least 'bucketCount' entries,
/// marking all entries invalid.
@inlinable // FIXME(sil-serialize-all)
internal init(_exactBucketCount bucketCount: Int) {
let bitmapWordCount = _UnsafeBitMap.sizeInWords(forSizeInBits: bucketCount)
let storage = Builtin.allocWithTailElems_3(HashTypedStorage.self,
bitmapWordCount._builtinWordValue, UInt.self,
bucketCount._builtinWordValue, Key.self,
bucketCount._builtinWordValue, Value.self)
self.init(_exactBucketCount: bucketCount, storage: storage)
}
#if _runtime(_ObjC)
@inlinable // FIXME(sil-serialize-all)
internal func bridged() -> _NSDictionary {
// We can zero-cost bridge if our keys are verbatim
// or if we're the empty singleton.
// Temporary var for SOME type safety before a cast.
let nsSet: _NSDictionaryCore
if (_isBridgedVerbatimToObjectiveC(Key.self) &&
_isBridgedVerbatimToObjectiveC(Value.self)) ||
self._storage === RawStorage.empty {
nsSet = self._storage
} else {
nsSet = _SwiftDeferredNSDictionary(nativeBuffer: self)
}
// Cast from "minimal NSDictionary" to "NSDictionary"
// Note that if you actually ask Swift for this cast, it will fail.
// Never trust a shadow protocol!
return unsafeBitCast(nsSet, to: _NSDictionary.self)
}
#endif
/// A textual representation of `self`.
@inlinable // FIXME(sil-serialize-all)
internal var description: String {
var result = ""
#if INTERNAL_CHECKS_ENABLED
for i in 0..<bucketCount {
if isInitializedEntry(at: i) {
let key = self.key(at: i)
result += "bucket \(i), ideal bucket = \(_bucket(key)), key = \(key)\n"
} else {
result += "bucket \(i), empty\n"
}
}
#endif
return result
}
@inlinable // FIXME(sil-serialize-all)
internal var _bucketMask: Int {
// The bucket count is not negative, therefore subtracting 1 will not
// overflow.
return bucketCount &- 1
}
@inlinable // FIXME(sil-serialize-all)
@inline(__always) // For performance reasons.
internal func _bucket(_ k: Key) -> Int {
return k._rawHashValue(seed: _storage.seed) & _bucketMask
}
@inlinable // FIXME(sil-serialize-all)
internal func _index(after bucket: Int) -> Int {
// Bucket is within 0 and bucketCount. Therefore adding 1 does not overflow.
return (bucket &+ 1) & _bucketMask
}
@inlinable // FIXME(sil-serialize-all)
internal func _prev(_ bucket: Int) -> Int {
// Bucket is not negative. Therefore subtracting 1 does not overflow.
return (bucket &- 1) & _bucketMask
}
/// Search for a given key starting from the specified bucket.
///
/// If the key is not present, returns the position where it could be
/// inserted.
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
internal func _find(_ key: Key, startBucket: Int)
-> (pos: Index, found: Bool) {
var bucket = startBucket
// The invariant guarantees there's always a hole, so we just loop
// until we find one
while true {
let isHole = !isInitializedEntry(at: bucket)
if isHole {
return (Index(offset: bucket), false)
}
if self.key(at: bucket) == key {
return (Index(offset: bucket), true)
}
bucket = _index(after: bucket)
}
}
@usableFromInline @_transparent
internal static func bucketCount(
forCapacity capacity: Int,
maxLoadFactorInverse: Double
) -> Int {
// `capacity + 1` below ensures that we don't fill in the last hole
return max(Int((Double(capacity) * maxLoadFactorInverse).rounded(.up)),
capacity + 1)
}
/// Buffer should be uniquely referenced.
/// The `key` should not be present in the Dictionary.
/// This function does *not* update `count`.
@inlinable // FIXME(sil-serialize-all)
internal func unsafeAddNew(key newKey: Key, value: Value) {
let (i, found) = _find(newKey, startBucket: _bucket(newKey))
_precondition(
!found, "Duplicate key found in Dictionary. Keys may have been mutated after insertion")
initializeKey(newKey, value: value, at: i.offset)
}
//
// _HashBuffer conformance
//
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
internal func index(forKey key: Key) -> Index? {
if count == 0 {
// Fast path that avoids computing the hash of the key.
return nil
}
let (i, found) = _find(key, startBucket: _bucket(key))
return found ? i : nil
}
@inlinable // FIXME(sil-serialize-all)
internal func assertingGet(_ key: Key) -> Value {
let (i, found) = _find(key, startBucket: _bucket(key))
_precondition(found, "Key not found")
return self.value(at: i.offset)
}
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
internal func maybeGet(_ key: Key) -> Value? {
if count == 0 {
// Fast path that avoids computing the hash of the key.
return nil
}
let (i, found) = _find(key, startBucket: _bucket(key))
if found {
return self.value(at: i.offset)
}
return nil
}
@inlinable // FIXME(sil-serialize-all)
@discardableResult
internal func updateValue(_ value: Value, forKey key: Key) -> Value? {
_sanityCheckFailure(
"don't call mutating methods on _NativeDictionaryBuffer")
}
@inlinable // FIXME(sil-serialize-all)
@discardableResult
internal func insert(
_ value: Value, forKey key: Key
) -> (inserted: Bool, memberAfterInsert: Value) {
_sanityCheckFailure(
"don't call mutating methods on _NativeDictionaryBuffer")
}
@inlinable // FIXME(sil-serialize-all)
@discardableResult
internal func remove(at index: Index) -> SequenceElement {
_sanityCheckFailure(
"don't call mutating methods on _NativeDictionaryBuffer")
}
@inlinable // FIXME(sil-serialize-all)
@discardableResult
internal func removeValue(forKey key: Key) -> Value? {
_sanityCheckFailure(
"don't call mutating methods on _NativeDictionaryBuffer")
}
@inlinable // FIXME(sil-serialize-all)
internal func removeAll(keepingCapacity keepCapacity: Bool) {
_sanityCheckFailure(
"don't call mutating methods on _NativeDictionaryBuffer")
}
@inlinable // FIXME(sil-serialize-all)
internal static func fromArray(_ elements: [SequenceElementWithoutLabels])
-> Buffer
{
if elements.isEmpty {
return Buffer()
}
var nativeBuffer = Buffer(minimumCapacity: elements.count)
for (key, value) in elements {
let (i, found) =
nativeBuffer._find(key, startBucket: nativeBuffer._bucket(key))
_precondition(!found, "Dictionary literal contains duplicate keys")
nativeBuffer.initializeKey(key, value: value, at: i.offset)
}
nativeBuffer.count = elements.count
return nativeBuffer
}
}
#if _runtime(_ObjC)
/// An NSEnumerator that works with any NativeDictionaryBuffer of
/// verbatim bridgeable elements. Used by the various NSDictionary impls.
@_fixed_layout // FIXME(sil-serialize-all)
@usableFromInline // FIXME(sil-serialize-all)
final internal class _NativeDictionaryNSEnumerator<Key, Value>
: _SwiftNativeNSEnumerator, _NSEnumerator {
@usableFromInline
internal typealias Buffer = _NativeDictionaryBuffer<Key, Value>
@usableFromInline
internal typealias Index = _NativeDictionaryIndex<Key, Value>
@inlinable // FIXME(sil-serialize-all)
internal override required init() {
_sanityCheckFailure("don't call this designated initializer")
}
@inlinable // FIXME(sil-serialize-all)
internal init(_ buffer: Buffer) {
self.buffer = buffer
nextIndex = buffer.startIndex
endIndex = buffer.endIndex
}
@usableFromInline // FIXME(sil-serialize-all)
internal var buffer: Buffer
@usableFromInline // FIXME(sil-serialize-all)
internal var nextIndex: Index
@usableFromInline // FIXME(sil-serialize-all)
internal var endIndex: Index
//
// NSEnumerator implementation.
//
// Do not call any of these methods from the standard library!
//
@inlinable // FIXME(sil-serialize-all)
@objc
internal func nextObject() -> AnyObject? {
if nextIndex == endIndex {
return nil
}
let key = buffer.bridgedKey(at: nextIndex)
buffer.formIndex(after: &nextIndex)
return key
}
@inlinable // FIXME(sil-serialize-all)
@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 nextIndex == endIndex {
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 key = buffer.bridgedKey(at: nextIndex)
buffer.formIndex(after: &nextIndex)
let unmanagedObjects = _UnmanagedAnyObjectArray(objects)
unmanagedObjects[0] = key
state.pointee = theState
return 1
}
}
#endif
#if _runtime(_ObjC)
/// This class exists for Objective-C bridging. It holds a reference to a
/// NativeDictionaryBuffer, 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 NativeDictionaryBuffer of AnyObject will be
/// constructed containing all the bridged elements.
@_fixed_layout // FIXME(sil-serialize-all)
@usableFromInline // FIXME(sil-serialize-all)
final internal class _SwiftDeferredNSDictionary<Key: Hashable, Value>
: _SwiftNativeNSDictionary, _NSDictionaryCore {
@usableFromInline
internal typealias NativeBuffer = _NativeDictionaryBuffer<Key, Value>
@usableFromInline
internal typealias BridgedBuffer = _NativeDictionaryBuffer<AnyObject, AnyObject>
@usableFromInline
internal typealias NativeIndex = _NativeDictionaryIndex<Key, Value>
@usableFromInline
internal typealias BridgedIndex = _NativeDictionaryIndex<AnyObject, AnyObject>
@inlinable // FIXME(sil-serialize-all)
@nonobjc
internal init(bucketCount: Int = 2) {
nativeBuffer = NativeBuffer(bucketCount: bucketCount)
super.init()
}
@inlinable // FIXME(sil-serialize-all)
internal init(nativeBuffer: NativeBuffer) {
self.nativeBuffer = nativeBuffer
super.init()
}
// This stored property should be stored at offset zero. We perform atomic
// operations on it.
//
// Do not access this property directly.
@usableFromInline // FIXME(sil-serialize-all)
@nonobjc
internal var _heapStorageBridged_DoNotUse: AnyObject?
/// The unbridged elements.
@usableFromInline // FIXME(sil-serialize-all)
internal var nativeBuffer: NativeBuffer
@inlinable // FIXME(sil-serialize-all)
@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
}
//
// NSDictionary implementation.
//
// Do not call any of these methods from the standard library! Use only
// `nativeBuffer`.
//
@inlinable // FIXME(sil-serialize-all)
@objc
internal required init(
objects: UnsafePointer<AnyObject?>,
forKeys: UnsafeRawPointer,
count: Int
) {
_sanityCheckFailure("don't call this designated initializer")
}
@inlinable // FIXME(sil-serialize-all)
@objc(objectForKey:)
internal func objectFor(_ aKey: AnyObject) -> AnyObject? {
return bridgingObjectForKey(aKey)
}
@inlinable // FIXME(sil-serialize-all)
@objc
internal func keyEnumerator() -> _NSEnumerator {
return enumerator()
}
@inlinable // FIXME(sil-serialize-all)
@objc(getObjects:andKeys:count:)
internal func getObjects(
_ objects: UnsafeMutablePointer<AnyObject>?,
andKeys keys: UnsafeMutablePointer<AnyObject>?,
count: Int
) {
bridgedAllKeysAndValues(objects, keys, count)
}
@inlinable // FIXME(sil-serialize-all)
@objc(enumerateKeysAndObjectsWithOptions:usingBlock:)
internal func enumerateKeysAndObjects(options: Int,
using block: @convention(block) (Unmanaged<AnyObject>, Unmanaged<AnyObject>,
UnsafeMutablePointer<UInt8>) -> Void) {
bridgeEverything()
let bucketCount = nativeBuffer.bucketCount
var stop: UInt8 = 0
for position in 0..<bucketCount {
if bridgedBuffer.isInitializedEntry(at: position) {
block(Unmanaged.passUnretained(bridgedBuffer.key(at: position)),
Unmanaged.passUnretained(bridgedBuffer.value(at: position)),
&stop)
}
if stop != 0 { return }
}
}
/// Returns the pointer to the stored property, which contains bridged
/// Dictionary elements.
@inlinable // FIXME(sil-serialize-all)
@nonobjc
internal var _heapStorageBridgedPtr: UnsafeMutablePointer<AnyObject?> {
return _getUnsafePointerToStoredProperties(self).assumingMemoryBound(
to: Optional<AnyObject>.self)
}
/// The buffer for bridged Dictionary elements, if present.
@inlinable // FIXME(sil-serialize-all)
@nonobjc
internal var _bridgedStorage: BridgedBuffer.RawStorage? {
get {
if let ref = _stdlib_atomicLoadARCRef(object: _heapStorageBridgedPtr) {
return unsafeDowncast(ref, to: BridgedBuffer.RawStorage.self)
}
return nil
}
}
/// Attach a buffer for bridged Dictionary elements.
@inlinable // FIXME(sil-serialize-all)
@nonobjc
internal func _initializeHeapStorageBridged(_ newStorage: AnyObject) {
_stdlib_atomicInitializeARCRef(
object: _heapStorageBridgedPtr, desired: newStorage)
}
/// Returns the bridged Dictionary values.
@inlinable // FIXME(sil-serialize-all)
internal var bridgedBuffer: BridgedBuffer {
return BridgedBuffer(_storage: _bridgedStorage!)
}
@inlinable // FIXME(sil-serialize-all)
@nonobjc
internal func bridgeEverything() {
if _fastPath(_bridgedStorage != nil) {
return
}
// FIXME: rdar://problem/19486139 (split bridged buffers for keys and values)
// We bridge keys and values unconditionally here, even if one of them
// actually is verbatim bridgeable (e.g. Dictionary<Int, AnyObject>).
// Investigate only allocating the buffer for a Set in this case.
// Create buffer for bridged data.
let bridged = BridgedBuffer(
_exactBucketCount: nativeBuffer.bucketCount,
unhashable: ())
// Bridge everything.
for i in 0..<nativeBuffer.bucketCount {
if nativeBuffer.isInitializedEntry(at: i) {
let key = _bridgeAnythingToObjectiveC(nativeBuffer.key(at: i))
let val = _bridgeAnythingToObjectiveC(nativeBuffer.value(at: i))
bridged.initializeKey(key, value: val, at: i)
}
}
// Atomically put the bridged elements in place.
_initializeHeapStorageBridged(bridged._storage)
}
@inlinable // FIXME(sil-serialize-all)
@nonobjc
internal func bridgedAllKeysAndValues(
_ objects: UnsafeMutablePointer<AnyObject>?,
_ keys: UnsafeMutablePointer<AnyObject>?,
_ count: Int
) {
_precondition(count >= 0, "Invalid count")
guard count > 0 else { return }
bridgeEverything()
var i = 0 // Current position in the output buffers
let bucketCount = nativeBuffer.bucketCount
if let unmanagedKeys = _UnmanagedAnyObjectArray(keys) {
if let unmanagedObjects = _UnmanagedAnyObjectArray(objects) {
// keys nonnull, objects nonnull
for position in 0..<bucketCount {
if bridgedBuffer.isInitializedEntry(at: position) {
unmanagedObjects[i] = bridgedBuffer.value(at: position)
unmanagedKeys[i] = bridgedBuffer.key(at: position)
i += 1
guard i < count else { break }
}
}
} else {
// keys nonnull, objects null
for position in 0..<bucketCount {
if bridgedBuffer.isInitializedEntry(at: position) {
unmanagedKeys[i] = bridgedBuffer.key(at: position)
i += 1
guard i < count else { break }
}
}
}
} else {
if let unmanagedObjects = _UnmanagedAnyObjectArray(objects) {
// keys null, objects nonnull
for position in 0..<bucketCount {
if bridgedBuffer.isInitializedEntry(at: position) {
unmanagedObjects[i] = bridgedBuffer.value(at: position)
i += 1
guard i < count else { break }
}
}
} else {
// do nothing, both are null
}
}
}
@inlinable // FIXME(sil-serialize-all)
@objc
internal var count: Int {
return nativeBuffer.count
}
@inlinable // FIXME(sil-serialize-all)
@nonobjc
internal func bridgingObjectForKey(_ aKey: AnyObject)
-> AnyObject? {
guard let nativeKey = _conditionallyBridgeFromObjectiveC(aKey, Key.self)
else { return nil }
let (i, found) = nativeBuffer._find(
nativeKey, startBucket: nativeBuffer._bucket(nativeKey))
if found {
bridgeEverything()
return bridgedBuffer.value(at: i.offset)
}
return nil
}
@inlinable // FIXME(sil-serialize-all)
@objc
internal func enumerator() -> _NSEnumerator {
bridgeEverything()
return _NativeDictionaryNSEnumerator<AnyObject, AnyObject>(bridgedBuffer)
}
@inlinable // FIXME(sil-serialize-all)
@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
theState.extra.0 = CUnsignedLong(nativeBuffer.startIndex.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 currIndex = _NativeDictionaryIndex<Key, Value>(
offset: Int(theState.extra.0))
let endIndex = nativeBuffer.endIndex
var stored = 0
// Only need to bridge once, so we can hoist it out of the loop.
if (currIndex != endIndex) {
bridgeEverything()
}
for i in 0..<count {
if (currIndex == endIndex) {
break
}
let bridgedKey = bridgedBuffer.key(at: currIndex.offset)
unmanagedObjects[i] = bridgedKey
stored += 1
nativeBuffer.formIndex(after: &currIndex)
}
theState.extra.0 = CUnsignedLong(currIndex.offset)
state.pointee = theState
return stored
}
}
#else
@_fixed_layout // FIXME(sil-serialize-all)
@usableFromInline // FIXME(sil-serialize-all)
final internal class _SwiftDeferredNSDictionary<Key: Hashable, Value> { }
#endif
#if _runtime(_ObjC)
@usableFromInline
@_fixed_layout
internal struct _CocoaDictionaryBuffer: _HashBuffer {
@usableFromInline
internal var cocoaDictionary: _NSDictionary
@inlinable // FIXME(sil-serialize-all)
internal init(cocoaDictionary: _NSDictionary) {
self.cocoaDictionary = cocoaDictionary
}
@usableFromInline
internal typealias Index = _CocoaDictionaryIndex
@usableFromInline
internal typealias SequenceElement = (AnyObject, AnyObject)
@usableFromInline
internal typealias SequenceElementWithoutLabels = (AnyObject, AnyObject)
@usableFromInline
internal typealias Key = AnyObject
@usableFromInline
internal typealias Value = AnyObject
@inlinable // FIXME(sil-serialize-all)
internal var startIndex: Index {
return Index(cocoaDictionary, startIndex: ())
}
@inlinable // FIXME(sil-serialize-all)
internal var endIndex: Index {
return Index(cocoaDictionary, endIndex: ())
}
@inlinable // FIXME(sil-serialize-all)
internal func index(after i: Index) -> Index {
return i.successor()
}
@inlinable // FIXME(sil-serialize-all)
internal func formIndex(after i: inout Index) {
// FIXME: swift-3-indexing-model: optimize if possible.
i = i.successor()
}
@inlinable // FIXME(sil-serialize-all)
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 maybeGet(key) == nil {
return nil
}
let allKeys = _stdlib_NSDictionary_allKeys(cocoaDictionary)
var keyIndex = -1
for i in 0..<allKeys.value {
if _stdlib_NSObject_isEqual(key, allKeys[i]) {
keyIndex = i
break
}
}
_sanityCheck(keyIndex >= 0,
"Key was found in fast path, but not found later?")
return Index(cocoaDictionary, allKeys, keyIndex)
}
@inlinable // FIXME(sil-serialize-all)
internal func assertingGet(_ i: Index) -> SequenceElement {
let key: Key = i.allKeys[i.currentKeyIndex]
let value: Value = i.cocoaDictionary.objectFor(key)!
return (key, value)
}
@inlinable // FIXME(sil-serialize-all)
internal func assertingGet(_ key: Key) -> Value {
let value: Value? = cocoaDictionary.objectFor(key)
_precondition(value != nil, "Key not found in underlying NSDictionary")
return value!
}
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
internal func maybeGet(_ key: Key) -> Value? {
return cocoaDictionary.objectFor(key)
}
@inlinable // FIXME(sil-serialize-all)
@discardableResult
internal mutating func updateValue(_ value: Value, forKey key: Key) -> Value? {
_sanityCheckFailure("cannot mutate NSDictionary")
}
@inlinable // FIXME(sil-serialize-all)
@discardableResult
internal mutating func insert(
_ value: Value, forKey key: Key
) -> (inserted: Bool, memberAfterInsert: Value) {
_sanityCheckFailure("cannot mutate NSDictionary")
}
@inlinable // FIXME(sil-serialize-all)
@discardableResult
internal mutating func remove(at index: Index) -> SequenceElement {
_sanityCheckFailure("cannot mutate NSDictionary")
}
@inlinable // FIXME(sil-serialize-all)
@discardableResult
internal mutating func removeValue(forKey key: Key) -> Value? {
_sanityCheckFailure("cannot mutate NSDictionary")
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func removeAll(keepingCapacity keepCapacity: Bool) {
_sanityCheckFailure("cannot mutate NSDictionary")
}
@inlinable // FIXME(sil-serialize-all)
internal var count: Int {
return cocoaDictionary.count
}
@inlinable // FIXME(sil-serialize-all)
internal static func fromArray(_ elements: [SequenceElementWithoutLabels])
-> _CocoaDictionaryBuffer {
_sanityCheckFailure("this function should never be called")
}
}
#endif
@usableFromInline
@_frozen
internal enum _VariantDictionaryBuffer<Key: Hashable, Value>: _HashBuffer {
@usableFromInline
internal typealias NativeBuffer = _NativeDictionaryBuffer<Key, Value>
@usableFromInline
internal typealias NativeIndex = _NativeDictionaryIndex<Key, Value>
#if _runtime(_ObjC)
@usableFromInline
internal typealias CocoaBuffer = _CocoaDictionaryBuffer
#endif
@usableFromInline
internal typealias SequenceElement = (key: Key, value: Value)
@usableFromInline
internal typealias SequenceElementWithoutLabels = (key: Key, value: Value)
@usableFromInline
internal typealias SelfType = _VariantDictionaryBuffer
case native(NativeBuffer)
#if _runtime(_ObjC)
case cocoa(CocoaBuffer)
#endif
@usableFromInline @_transparent
internal var guaranteedNative: Bool {
return _canBeClass(Key.self) == 0 || _canBeClass(Value.self) == 0
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func isUniquelyReferenced() -> Bool {
// Note that &self drills down through .native(NativeBuffer) to the first
// property in NativeBuffer, which is the reference to the storage.
if _fastPath(guaranteedNative) {
return _isUnique_native(&self)
}
switch self {
case .native:
return _isUnique_native(&self)
#if _runtime(_ObjC)
case .cocoa:
// Don't consider Cocoa buffer mutable, even if it is mutable and is
// uniquely referenced.
return false
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
internal var asNative: NativeBuffer {
get {
switch self {
case .native(let buffer):
return buffer
#if _runtime(_ObjC)
case .cocoa:
_sanityCheckFailure("internal error: not backed by native buffer")
#endif
}
}
set {
self = .native(newValue)
}
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func ensureNativeBuffer() {
#if _runtime(_ObjC)
if _fastPath(guaranteedNative) { return }
if case .cocoa(let cocoaBuffer) = self {
migrateDataToNativeBuffer(cocoaBuffer)
}
#endif
}
#if _runtime(_ObjC)
@inlinable // FIXME(sil-serialize-all)
internal var asCocoa: CocoaBuffer {
switch self {
case .native:
_sanityCheckFailure("internal error: not backed by NSDictionary")
case .cocoa(let cocoaBuffer):
return cocoaBuffer
}
}
#endif
/// Return true if self is native.
@inlinable // FIXME(sil-serialize-all)
internal var _isNative: Bool {
#if _runtime(_ObjC)
switch self {
case .native:
return true
case .cocoa:
return false
}
#else
return true
#endif
}
@inline(__always)
@inlinable // FIXME(sil-serialize-all)
internal mutating func ensureUniqueNativeBufferNative(
withBucketCount desiredBucketCount: Int
) -> (reallocated: Bool, capacityChanged: Bool) {
let oldBucketCount = asNative.bucketCount
if oldBucketCount >= desiredBucketCount && isUniquelyReferenced() {
return (reallocated: false, capacityChanged: false)
}
let oldNativeBuffer = asNative
var newNativeBuffer = NativeBuffer(bucketCount: desiredBucketCount)
let newBucketCount = newNativeBuffer.bucketCount
for i in 0..<oldBucketCount {
if oldNativeBuffer.isInitializedEntry(at: i) {
if oldBucketCount == newBucketCount {
let key = oldNativeBuffer.key(at: i)
let value = oldNativeBuffer.value(at: i)
newNativeBuffer.initializeKey(key, value: value , at: i)
} else {
let key = oldNativeBuffer.key(at: i)
newNativeBuffer.unsafeAddNew(
key: key,
value: oldNativeBuffer.value(at: i))
}
}
}
newNativeBuffer.count = oldNativeBuffer.count
self = .native(newNativeBuffer)
return (reallocated: true,
capacityChanged: oldBucketCount != newBucketCount)
}
@inline(__always)
@inlinable // FIXME(sil-serialize-all)
internal mutating func ensureUniqueNativeBuffer(
withCapacity minimumCapacity: Int
) -> (reallocated: Bool, capacityChanged: Bool) {
let bucketCount = NativeBuffer.bucketCount(
forCapacity: minimumCapacity,
maxLoadFactorInverse: _hashContainerDefaultMaxLoadFactorInverse)
return ensureUniqueNativeBuffer(withBucketCount: bucketCount)
}
/// Ensure this we hold a unique reference to a native buffer
/// having at least `minimumCapacity` elements.
@inlinable // FIXME(sil-serialize-all)
internal mutating func ensureUniqueNativeBuffer(
withBucketCount desiredBucketCount: Int
) -> (reallocated: Bool, capacityChanged: Bool) {
#if _runtime(_ObjC)
// This is a performance optimization that was put in to ensure that we did
// not make a copy of self to call _isNative over the entire if region
// causing at -Onone the uniqueness check to fail. This code used to be:
//
// if _isNative {
// return ensureUniqueNativeBufferNative(
// withBucketCount: desiredBucketCount)
// }
//
// SR-6437
let n = _isNative
if n {
return ensureUniqueNativeBufferNative(withBucketCount: desiredBucketCount)
}
switch self {
case .native:
fatalError("This should have been handled earlier")
case .cocoa(let cocoaBuffer):
let cocoaDictionary = cocoaBuffer.cocoaDictionary
var newNativeBuffer = NativeBuffer(bucketCount: desiredBucketCount)
let oldCocoaIterator = _CocoaDictionaryIterator(cocoaDictionary)
while let (key, value) = oldCocoaIterator.next() {
newNativeBuffer.unsafeAddNew(
key: _forceBridgeFromObjectiveC(key, Key.self),
value: _forceBridgeFromObjectiveC(value, Value.self))
}
newNativeBuffer.count = cocoaDictionary.count
self = .native(newNativeBuffer)
return (reallocated: true, capacityChanged: true)
}
#else
return ensureUniqueNativeBufferNative(withBucketCount: desiredBucketCount)
#endif
}
#if _runtime(_ObjC)
@inline(never)
@usableFromInline
internal mutating func migrateDataToNativeBuffer(
_ cocoaBuffer: _CocoaDictionaryBuffer
) {
let allocated = ensureUniqueNativeBuffer(
withCapacity: cocoaBuffer.count).reallocated
_sanityCheck(allocated, "failed to allocate native Dictionary buffer")
}
#endif
/// Reserves enough space for the specified number of elements to be stored
/// without reallocating additional storage.
@inlinable // FIXME(sil-serialize-all)
internal mutating func reserveCapacity(_ capacity: Int) {
_ = ensureUniqueNativeBuffer(withCapacity: capacity)
}
/// The number of elements that can be stored without expanding the current
/// storage.
///
/// For bridged storage, this is equal to the current count of the
/// collection, since any addition will trigger a copy of the elements into
/// newly allocated storage. For native storage, this is the element count
/// at which adding any more elements will exceed the load factor.
@inlinable // FIXME(sil-serialize-all)
internal var capacity: Int {
switch self {
case .native:
return Int(Double(asNative.bucketCount) /
_hashContainerDefaultMaxLoadFactorInverse)
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
return cocoaBuffer.count
#endif
}
}
//
// _HashBuffer conformance
//
@usableFromInline
internal typealias Index = DictionaryIndex<Key, Value>
@inlinable // FIXME(sil-serialize-all)
internal var startIndex: Index {
if _fastPath(guaranteedNative) {
return ._native(asNative.startIndex)
}
switch self {
case .native:
return ._native(asNative.startIndex)
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
return ._cocoa(cocoaBuffer.startIndex)
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
internal var endIndex: Index {
if _fastPath(guaranteedNative) {
return ._native(asNative.endIndex)
}
switch self {
case .native:
return ._native(asNative.endIndex)
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
return ._cocoa(cocoaBuffer.endIndex)
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
internal func index(after i: Index) -> Index {
if _fastPath(guaranteedNative) {
return ._native(asNative.index(after: i._nativeIndex))
}
switch self {
case .native:
return ._native(asNative.index(after: i._nativeIndex))
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
return ._cocoa(cocoaBuffer.index(after: i._cocoaIndex))
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
internal func formIndex(after i: inout Index) {
// FIXME: swift-3-indexing-model: optimize if possible.
i = index(after: i)
}
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
internal func index(forKey key: Key) -> Index? {
if _fastPath(guaranteedNative) {
if let nativeIndex = asNative.index(forKey: key) {
return ._native(nativeIndex)
}
return nil
}
switch self {
case .native:
if let nativeIndex = asNative.index(forKey: key) {
return ._native(nativeIndex)
}
return nil
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
let anyObjectKey: AnyObject = _bridgeAnythingToObjectiveC(key)
if let cocoaIndex = cocoaBuffer.index(forKey: anyObjectKey) {
return ._cocoa(cocoaIndex)
}
return nil
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
internal func containsKey(_ key: Key) -> Bool {
if _fastPath(guaranteedNative) {
return asNative.index(forKey: key) != nil
}
switch self {
case .native:
return asNative.index(forKey: key) != nil
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
return SelfType.maybeGetFromCocoaBuffer(cocoaBuffer, forKey: key) != nil
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
internal func assertingGet(_ i: Index) -> SequenceElement {
if _fastPath(guaranteedNative) {
return asNative.assertingGet(i._nativeIndex)
}
switch self {
case .native:
return asNative.assertingGet(i._nativeIndex)
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
let (anyObjectKey, anyObjectValue) =
cocoaBuffer.assertingGet(i._cocoaIndex)
let nativeKey = _forceBridgeFromObjectiveC(anyObjectKey, Key.self)
let nativeValue = _forceBridgeFromObjectiveC(anyObjectValue, Value.self)
return (nativeKey, nativeValue)
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
internal func assertingGet(_ key: Key) -> Value {
if _fastPath(guaranteedNative) {
return asNative.assertingGet(key)
}
switch self {
case .native:
return asNative.assertingGet(key)
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
// FIXME: This assumes that Key and Value are bridged verbatim.
let anyObjectKey: AnyObject = _bridgeAnythingToObjectiveC(key)
let anyObjectValue: AnyObject = cocoaBuffer.assertingGet(anyObjectKey)
return _forceBridgeFromObjectiveC(anyObjectValue, Value.self)
#endif
}
}
#if _runtime(_ObjC)
@inline(never)
@usableFromInline
internal static func maybeGetFromCocoaBuffer(
_ cocoaBuffer: CocoaBuffer, forKey key: Key
) -> Value? {
let anyObjectKey: AnyObject = _bridgeAnythingToObjectiveC(key)
if let anyObjectValue = cocoaBuffer.maybeGet(anyObjectKey) {
return _forceBridgeFromObjectiveC(anyObjectValue, Value.self)
}
return nil
}
#endif
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
internal func maybeGet(_ key: Key) -> Value? {
if _fastPath(guaranteedNative) {
return asNative.maybeGet(key)
}
switch self {
case .native:
return asNative.maybeGet(key)
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
return SelfType.maybeGetFromCocoaBuffer(cocoaBuffer, forKey: key)
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func nativeUpdateValue(
_ value: Value, forKey key: Key
) -> Value? {
var (i, found) = asNative._find(key, startBucket: asNative._bucket(key))
let minBuckets = found
? asNative.bucketCount
: NativeBuffer.bucketCount(
forCapacity: asNative.count + 1,
maxLoadFactorInverse: _hashContainerDefaultMaxLoadFactorInverse)
let (_, capacityChanged) = ensureUniqueNativeBuffer(
withBucketCount: minBuckets)
if capacityChanged {
i = asNative._find(key, startBucket: asNative._bucket(key)).pos
}
let oldValue: Value? = found ? asNative.value(at: i.offset) : nil
if found {
asNative.setKey(key, value: value, at: i.offset)
} else {
asNative.initializeKey(key, value: value, at: i.offset)
asNative.count += 1
}
return oldValue
}
@inlinable // FIXME(sil-serialize-all)
@discardableResult
internal mutating func updateValue(
_ value: Value, forKey key: Key
) -> Value? {
if _fastPath(guaranteedNative) {
return nativeUpdateValue(value, forKey: key)
}
switch self {
case .native:
return nativeUpdateValue(value, forKey: key)
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
migrateDataToNativeBuffer(cocoaBuffer)
return nativeUpdateValue(value, forKey: key)
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func nativePointerToValue(at i: Index)
-> UnsafeMutablePointer<Value> {
// This is a performance optimization that was put in to ensure that we did
// not make a copy of self to call asNative.bucketCount over
// ensureUniqueNativeBefore causing at -Onone the uniqueness check to
// fail. This code used to be:
//
// _ = ensureUniqueNativeBuffer(withBucketCount: bucketCount)
//
// SR-6437
let bucketCount = asNative.bucketCount
_ = ensureUniqueNativeBuffer(withBucketCount: bucketCount)
return asNative.values + i._nativeIndex.offset
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func pointerToValue(at i: Index)
-> UnsafeMutablePointer<Value> {
if _fastPath(guaranteedNative) {
return nativePointerToValue(at: i)
}
switch self {
case .native:
return nativePointerToValue(at: i)
#if _runtime(_ObjC)
case .cocoa(let cocoaStorage):
// We have to migrate the data to native storage before we can return a
// mutable pointer. But after we migrate, the Cocoa index becomes
// useless, so get the key first.
let cocoaIndex = i._cocoaIndex
let anyObjectKey: AnyObject =
cocoaIndex.allKeys[cocoaIndex.currentKeyIndex]
migrateDataToNativeBuffer(cocoaStorage)
let key = _forceBridgeFromObjectiveC(anyObjectKey, Key.self)
let nativeIndex = asNative.index(forKey: key)!
return nativePointerToValue(at: ._native(nativeIndex))
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func nativePointerToValue(
forKey key: Key, insertingDefault defaultValue: () -> Value
) -> (inserted: Bool, pointer: UnsafeMutablePointer<Value>) {
var (i, found) = asNative._find(key, startBucket: asNative._bucket(key))
if found {
let pointer = nativePointerToValue(at: ._native(i))
return (inserted: false, pointer: pointer)
}
let minCapacity = asNative.count + 1
let (_, capacityChanged) = ensureUniqueNativeBuffer(
withCapacity: minCapacity)
if capacityChanged {
i = asNative._find(key, startBucket: asNative._bucket(key)).pos
}
asNative.initializeKey(key, value: defaultValue(), at: i.offset)
asNative.count += 1
return (inserted: true, pointer: asNative.values + i.offset)
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func pointerToValue(
forKey key: Key, insertingDefault defaultValue: () -> Value
) -> (inserted: Bool, pointer: UnsafeMutablePointer<Value>) {
ensureNativeBuffer()
return nativePointerToValue(forKey: key, insertingDefault: defaultValue)
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func nativeInsert(
_ value: Value, forKey key: Key
) -> (inserted: Bool, memberAfterInsert: Value) {
var (i, found) = asNative._find(key, startBucket: asNative._bucket(key))
if found {
return (inserted: false, memberAfterInsert: asNative.value(at: i.offset))
}
let minCapacity = asNative.count + 1
let (_, capacityChanged) = ensureUniqueNativeBuffer(
withCapacity: minCapacity)
if capacityChanged {
i = asNative._find(key, startBucket: asNative._bucket(key)).pos
}
asNative.initializeKey(key, value: value, at: i.offset)
asNative.count += 1
return (inserted: true, memberAfterInsert: value)
}
@inlinable // FIXME(sil-serialize-all)
@discardableResult
internal mutating func insert(
_ value: Value, forKey key: Key
) -> (inserted: Bool, memberAfterInsert: Value) {
ensureNativeBuffer()
return nativeInsert(value, forKey: key)
}
@inlinable // FIXME(sil-serialize-all)
internal func nativeMapValues<T>(
_ transform: (Value) throws -> T
) rethrows -> _VariantDictionaryBuffer<Key, T> {
var buffer = _NativeDictionaryBuffer<Key, T>(
_exactBucketCount: asNative.bucketCount)
// Because the keys in the current and new buffer are the same, we can
// initialize to the same locations in the new buffer, skipping hash value
// recalculations.
var i = asNative.startIndex
while i != asNative.endIndex {
let (k, v) = asNative.assertingGet(i)
try buffer.initializeKey(k, value: transform(v), at: i.offset)
asNative.formIndex(after: &i)
}
buffer.count = asNative.count
return .native(buffer)
}
@inlinable // FIXME(sil-serialize-all)
internal func mapValues<T>(
_ transform: (Value) throws -> T
) rethrows -> _VariantDictionaryBuffer<Key, T> {
if _fastPath(guaranteedNative) {
return try nativeMapValues(transform)
}
switch self {
case .native:
return try nativeMapValues(transform)
#if _runtime(_ObjC)
case .cocoa(let cocoaStorage):
var storage: _VariantDictionaryBuffer<Key, T> = .native(
_NativeDictionaryBuffer<Key, T>(minimumCapacity: cocoaStorage.count))
var i = cocoaStorage.startIndex
while i != cocoaStorage.endIndex {
let (anyObjectKey, anyObjectValue) = cocoaStorage.assertingGet(i)
let nativeKey = _forceBridgeFromObjectiveC(anyObjectKey, Key.self)
let nativeValue = _forceBridgeFromObjectiveC(anyObjectValue, Value.self)
_ = try storage.nativeInsert(transform(nativeValue), forKey: nativeKey)
cocoaStorage.formIndex(after: &i)
}
return storage
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func nativeMerge<S: Sequence>(
_ keysAndValues: S,
uniquingKeysWith combine: (Value, Value) throws -> Value
) rethrows where S.Element == (Key, Value) {
for (key, value) in keysAndValues {
var (i, found) = asNative._find(key, startBucket: asNative._bucket(key))
if found {
// This is a performance optimization that was put in to ensure that we
// did not make a copy of self to call asNative.bucketCount over
// ensureUniqueNativeBefore causing at -Onone the uniqueness check to
// fail. This code used to be:
//
// _ = ensureUniqueNativeBuffer(withBucketCount: asNative.bucketCount)
//
// SR-6437
let bucketCount = asNative.bucketCount
_ = ensureUniqueNativeBuffer(withBucketCount: bucketCount)
do {
let newValue = try combine(asNative.value(at: i.offset), value)
asNative.setKey(key, value: newValue, at: i.offset)
} catch _MergeError.keyCollision {
fatalError("Duplicate values for key: '\(key)'")
}
} else {
let minCapacity = asNative.count + 1
let (_, capacityChanged) = ensureUniqueNativeBuffer(
withCapacity: minCapacity)
if capacityChanged {
i = asNative._find(key, startBucket: asNative._bucket(key)).pos
}
asNative.initializeKey(key, value: value, at: i.offset)
asNative.count += 1
}
}
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func merge<S: Sequence>(
_ keysAndValues: S,
uniquingKeysWith combine: (Value, Value) throws -> Value
) rethrows where S.Element == (Key, Value) {
ensureNativeBuffer()
try nativeMerge(keysAndValues, uniquingKeysWith: combine)
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func nativeGroup<S: Sequence>(
_ values: S,
by keyForValue: (S.Element) throws -> Key
) rethrows where Value == [S.Element] {
defer { _fixLifetime(asNative) }
for value in values {
let key = try keyForValue(value)
var (i, found) = asNative._find(key, startBucket: asNative._bucket(key))
if found {
asNative.values[i.offset].append(value)
} else {
let minCapacity = asNative.count + 1
let (_, capacityChanged) = ensureUniqueNativeBuffer(
withCapacity: minCapacity)
if capacityChanged {
i = asNative._find(key, startBucket: asNative._bucket(key)).pos
}
asNative.initializeKey(key, value: [value], at: i.offset)
asNative.count += 1
}
}
}
/// - parameter idealBucket: The ideal bucket for the element being deleted.
/// - parameter offset: The offset of the element that will be deleted.
/// Precondition: there should be an initialized entry at offset.
@inlinable // FIXME(sil-serialize-all)
internal mutating func nativeDelete(
_ nativeBuffer: NativeBuffer, idealBucket: Int, offset: Int
) {
_sanityCheck(
nativeBuffer.isInitializedEntry(at: offset), "expected initialized entry")
var nativeBuffer = nativeBuffer
// remove the element
nativeBuffer.destroyEntry(at: offset)
nativeBuffer.count -= 1
// If we've put a hole in a chain of contiguous elements, some
// element after the hole may belong where the new hole is.
var hole = offset
// Find the first bucket in the contiguous chain
var start = idealBucket
while nativeBuffer.isInitializedEntry(at: nativeBuffer._prev(start)) {
start = nativeBuffer._prev(start)
}
// Find the last bucket in the contiguous chain
var lastInChain = hole
var b = nativeBuffer._index(after: lastInChain)
while nativeBuffer.isInitializedEntry(at: b) {
lastInChain = b
b = nativeBuffer._index(after: b)
}
// Relocate out-of-place elements in the chain, repeating until
// none are found.
while hole != lastInChain {
// Walk backwards from the end of the chain looking for
// something out-of-place.
var b = lastInChain
while b != hole {
let idealBucket = nativeBuffer._bucket(nativeBuffer.key(at: b))
// Does this element belong between start and hole? We need
// two separate tests depending on whether [start, hole] wraps
// around the end of the storage
let c0 = idealBucket >= start
let c1 = idealBucket <= hole
if start <= hole ? (c0 && c1) : (c0 || c1) {
break // Found it
}
b = nativeBuffer._prev(b)
}
if b == hole { // No out-of-place elements found; we're done adjusting
break
}
// Move the found element into the hole
nativeBuffer.moveInitializeEntry(
from: nativeBuffer,
at: b,
toEntryAt: hole)
hole = b
}
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func nativeRemoveObject(forKey key: Key) -> Value? {
var idealBucket = asNative._bucket(key)
var (index, found) = asNative._find(key, startBucket: idealBucket)
// Fast path: if the key is not present, we will not mutate the set,
// so don't force unique buffer.
if !found {
return nil
}
// This is a performance optimization that was put in to ensure that we
// did not make a copy of self to call asNative.bucketCount over
// ensureUniqueNativeBefore causing at -Onone the uniqueness check to
// fail. This code used to be:
//
// ... = ensureUniqueNativeBuffer(withBucketCount: asNative.bucketCount)
//
// SR-6437
let bucketCount = asNative.bucketCount
let (_, capacityChanged) = ensureUniqueNativeBuffer(
withBucketCount: bucketCount)
let nativeBuffer = asNative
if capacityChanged {
idealBucket = nativeBuffer._bucket(key)
(index, found) = nativeBuffer._find(key, startBucket: idealBucket)
_sanityCheck(found, "key was lost during buffer migration")
}
let oldValue = nativeBuffer.value(at: index.offset)
nativeDelete(nativeBuffer, idealBucket: idealBucket,
offset: index.offset)
return oldValue
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func nativeRemove(
at nativeIndex: NativeIndex
) -> SequenceElement {
// This is a performance optimization that was put in to ensure that we did
// not make a copy of self to call asNative.bucketCount over
// ensureUniqueNativeBefore causing at -Onone the uniqueness check to
// fail. This code used to be:
//
// _ = ensureUniqueNativeBuffer(withBucketCount: asNative.bucketCount)
//
// SR-6437
let bucketCount = asNative.bucketCount
// The provided index should be valid, so we will always mutating the
// set buffer. Request unique buffer.
_ = ensureUniqueNativeBuffer(withBucketCount: bucketCount)
let nativeBuffer = asNative
let result = nativeBuffer.assertingGet(nativeIndex)
let key = result.0
nativeDelete(nativeBuffer, idealBucket: nativeBuffer._bucket(key),
offset: nativeIndex.offset)
return result
}
@inlinable // FIXME(sil-serialize-all)
@discardableResult
internal mutating func remove(at index: Index) -> SequenceElement {
if _fastPath(guaranteedNative) {
return nativeRemove(at: index._nativeIndex)
}
switch self {
case .native:
return nativeRemove(at: index._nativeIndex)
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
// We have to migrate the data first. But after we do so, the Cocoa
// index becomes useless, so get the key first.
//
// FIXME(performance): fuse data migration and element deletion into one
// operation.
let index = index._cocoaIndex
let anyObjectKey: AnyObject = index.allKeys[index.currentKeyIndex]
migrateDataToNativeBuffer(cocoaBuffer)
let key = _forceBridgeFromObjectiveC(anyObjectKey, Key.self)
let value = nativeRemoveObject(forKey: key)
return (key, value._unsafelyUnwrappedUnchecked)
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
@discardableResult
internal mutating func removeValue(forKey key: Key) -> Value? {
if _fastPath(guaranteedNative) {
return nativeRemoveObject(forKey: key)
}
switch self {
case .native:
return nativeRemoveObject(forKey: key)
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
let anyObjectKey: AnyObject = _bridgeAnythingToObjectiveC(key)
if cocoaBuffer.maybeGet(anyObjectKey) == nil {
return nil
}
migrateDataToNativeBuffer(cocoaBuffer)
return nativeRemoveObject(forKey: key)
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func nativeRemoveAll() {
if !isUniquelyReferenced() {
asNative = NativeBuffer(_exactBucketCount: asNative.bucketCount)
return
}
// We have already checked for the empty dictionary case and unique
// reference, so we will always mutate the dictionary buffer.
var nativeBuffer = asNative
for b in 0..<nativeBuffer.bucketCount {
if nativeBuffer.isInitializedEntry(at: b) {
nativeBuffer.destroyEntry(at: b)
}
}
nativeBuffer.count = 0
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func removeAll(keepingCapacity keepCapacity: Bool) {
if count == 0 {
return
}
if !keepCapacity {
self = .native(NativeBuffer(bucketCount: 2))
return
}
if _fastPath(guaranteedNative) {
nativeRemoveAll()
return
}
switch self {
case .native:
nativeRemoveAll()
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
self = .native(NativeBuffer(minimumCapacity: cocoaBuffer.count))
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
internal var count: Int {
if _fastPath(guaranteedNative) {
return asNative.count
}
switch self {
case .native:
return asNative.count
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
return cocoaBuffer.count
#endif
}
}
/// Returns an iterator over the `(Key, Value)` pairs.
///
/// - Complexity: O(1).
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
internal func makeIterator() -> DictionaryIterator<Key, Value> {
switch self {
case .native(let buffer):
return ._native(
start: asNative.startIndex, end: asNative.endIndex, buffer: buffer)
#if _runtime(_ObjC)
case .cocoa(let cocoaBuffer):
return ._cocoa(_CocoaDictionaryIterator(cocoaBuffer.cocoaDictionary))
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
internal static func fromArray(_ elements: [SequenceElement])
-> _VariantDictionaryBuffer<Key, Value> {
_sanityCheckFailure("this function should never be called")
}
}
@_fixed_layout // FIXME(sil-serialize-all)
@usableFromInline
internal struct _NativeDictionaryIndex<Key, Value>: Comparable {
@usableFromInline
internal var offset: Int
@inlinable // FIXME(sil-serialize-all)
internal init(offset: Int) {
self.offset = offset
}
}
extension _NativeDictionaryIndex {
@inlinable // FIXME(sil-serialize-all)
internal static func < (
lhs: _NativeDictionaryIndex<Key, Value>,
rhs: _NativeDictionaryIndex<Key, Value>
) -> Bool {
return lhs.offset < rhs.offset
}
@inlinable // FIXME(sil-serialize-all)
internal static func <= (
lhs: _NativeDictionaryIndex<Key, Value>,
rhs: _NativeDictionaryIndex<Key, Value>
) -> Bool {
return lhs.offset <= rhs.offset
}
@inlinable // FIXME(sil-serialize-all)
internal static func > (
lhs: _NativeDictionaryIndex<Key, Value>,
rhs: _NativeDictionaryIndex<Key, Value>
) -> Bool {
return lhs.offset > rhs.offset
}
@inlinable // FIXME(sil-serialize-all)
internal static func >= (
lhs: _NativeDictionaryIndex<Key, Value>,
rhs: _NativeDictionaryIndex<Key, Value>
) -> Bool {
return lhs.offset >= rhs.offset
}
@inlinable // FIXME(sil-serialize-all)
internal static func == (
lhs: _NativeDictionaryIndex<Key, Value>,
rhs: _NativeDictionaryIndex<Key, Value>
) -> Bool {
return lhs.offset == rhs.offset
}
}
#if _runtime(_ObjC)
@_fixed_layout // FIXME(sil-serialize-all)
@usableFromInline
internal struct _CocoaDictionaryIndex: Comparable {
// 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.
@usableFromInline // FIXME(sil-serialize-all)
internal let cocoaDictionary: _NSDictionary
// 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.
@usableFromInline // FIXME(sil-serialize-all)
internal var allKeys: _HeapBuffer<Int, AnyObject>
/// Index into `allKeys`
@usableFromInline // FIXME(sil-serialize-all)
internal var currentKeyIndex: Int
@inlinable // FIXME(sil-serialize-all)
internal init(_ cocoaDictionary: _NSDictionary, startIndex: ()) {
self.cocoaDictionary = cocoaDictionary
self.allKeys = _stdlib_NSDictionary_allKeys(cocoaDictionary)
self.currentKeyIndex = 0
}
@inlinable // FIXME(sil-serialize-all)
internal init(_ cocoaDictionary: _NSDictionary, endIndex: ()) {
self.cocoaDictionary = cocoaDictionary
self.allKeys = _stdlib_NSDictionary_allKeys(cocoaDictionary)
self.currentKeyIndex = allKeys.value
}
@inlinable // FIXME(sil-serialize-all)
internal init(_ cocoaDictionary: _NSDictionary,
_ allKeys: _HeapBuffer<Int, AnyObject>,
_ currentKeyIndex: Int
) {
self.cocoaDictionary = cocoaDictionary
self.allKeys = allKeys
self.currentKeyIndex = currentKeyIndex
}
/// Returns the next consecutive value after `self`.
///
/// - Precondition: The next value is representable.
@inlinable // FIXME(sil-serialize-all)
internal func successor() -> _CocoaDictionaryIndex {
// FIXME: swift-3-indexing-model: remove this method.
_precondition(
currentKeyIndex < allKeys.value, "Cannot increment endIndex")
return _CocoaDictionaryIndex(cocoaDictionary, allKeys, currentKeyIndex + 1)
}
}
extension _CocoaDictionaryIndex {
@inlinable // FIXME(sil-serialize-all)
internal static func < (
lhs: _CocoaDictionaryIndex,
rhs: _CocoaDictionaryIndex
) -> Bool {
return lhs.currentKeyIndex < rhs.currentKeyIndex
}
@inlinable // FIXME(sil-serialize-all)
internal static func <= (
lhs: _CocoaDictionaryIndex,
rhs: _CocoaDictionaryIndex
) -> Bool {
return lhs.currentKeyIndex <= rhs.currentKeyIndex
}
@inlinable // FIXME(sil-serialize-all)
internal static func > (
lhs: _CocoaDictionaryIndex,
rhs: _CocoaDictionaryIndex
) -> Bool {
return lhs.currentKeyIndex > rhs.currentKeyIndex
}
@inlinable // FIXME(sil-serialize-all)
internal static func >= (
lhs: _CocoaDictionaryIndex,
rhs: _CocoaDictionaryIndex
) -> Bool {
return lhs.currentKeyIndex >= rhs.currentKeyIndex
}
@inlinable // FIXME(sil-serialize-all)
internal static func == (
lhs: _CocoaDictionaryIndex,
rhs: _CocoaDictionaryIndex
) -> Bool {
return lhs.currentKeyIndex == rhs.currentKeyIndex
}
}
#endif
@_frozen // FIXME(sil-serialize-all)
@usableFromInline // FIXME(sil-serialize-all)
internal enum DictionaryIndexRepresentation<Key: Hashable, Value> {
@usableFromInline
typealias _Index = DictionaryIndex<Key, Value>
@usableFromInline
typealias _NativeIndex = _Index._NativeIndex
#if _runtime(_ObjC)
@usableFromInline
typealias _CocoaIndex = _Index._CocoaIndex
#endif
case _native(_NativeIndex)
#if _runtime(_ObjC)
case _cocoa(_CocoaIndex)
#endif
}
extension Dictionary {
/// The position of a key-value pair in a dictionary.
///
/// Dictionary has two subscripting interfaces:
///
/// 1. Subscripting with a key, yielding an optional value:
///
/// v = d[k]!
///
/// 2. Subscripting with an index, yielding a key-value pair:
///
/// (k, v) = d[i]
@_fixed_layout // FIXME(sil-serialize-all)
public struct Index: Comparable, Hashable {
// Index for native buffer is efficient. Index for bridged NSDictionary is
// not, because neither NSEnumerator nor fast enumeration support moving
// backwards. Even if they did, there is another issue: NSEnumerator does
// not support NSCopying, and fast enumeration does not document that it is
// safe to copy the state. So, we cannot implement Index that is a value
// type for bridged NSDictionary in terms of Cocoa enumeration facilities.
@usableFromInline
internal typealias _NativeIndex = _NativeDictionaryIndex<Key, Value>
#if _runtime(_ObjC)
@usableFromInline
internal typealias _CocoaIndex = _CocoaDictionaryIndex
#endif
@inlinable // FIXME(sil-serialize-all)
internal init(_value: DictionaryIndexRepresentation<Key, Value>) {
self._value = _value
}
@usableFromInline // FIXME(sil-serialize-all)
internal var _value: DictionaryIndexRepresentation<Key, Value>
@inlinable // FIXME(sil-serialize-all)
internal static func _native(_ index: _NativeIndex) -> Index {
return DictionaryIndex(_value: ._native(index))
}
#if _runtime(_ObjC)
@inlinable // FIXME(sil-serialize-all)
internal static func _cocoa(_ index: _CocoaIndex) -> Index {
return DictionaryIndex(_value: ._cocoa(index))
}
#endif
@usableFromInline @_transparent
internal var _guaranteedNative: Bool {
return _canBeClass(Key.self) == 0 && _canBeClass(Value.self) == 0
}
@usableFromInline @_transparent
internal var _nativeIndex: _NativeIndex {
switch _value {
case ._native(let nativeIndex):
return nativeIndex
#if _runtime(_ObjC)
case ._cocoa:
_sanityCheckFailure("internal error: does not contain a native index")
#endif
}
}
#if _runtime(_ObjC)
@usableFromInline @_transparent
internal var _cocoaIndex: _CocoaIndex {
switch _value {
case ._native:
_sanityCheckFailure("internal error: does not contain a Cocoa index")
case ._cocoa(let cocoaIndex):
return cocoaIndex
}
}
#endif
}
}
public typealias DictionaryIndex<Key: Hashable, Value> =
Dictionary<Key, Value>.Index
extension Dictionary.Index {
@inlinable // FIXME(sil-serialize-all)
public static func == (
lhs: Dictionary<Key, Value>.Index,
rhs: Dictionary<Key, Value>.Index
) -> Bool {
if _fastPath(lhs._guaranteedNative) {
return lhs._nativeIndex == rhs._nativeIndex
}
switch (lhs._value, rhs._value) {
case (._native(let lhsNative), ._native(let rhsNative)):
return lhsNative == rhsNative
#if _runtime(_ObjC)
case (._cocoa(let lhsCocoa), ._cocoa(let rhsCocoa)):
return lhsCocoa == rhsCocoa
default:
_preconditionFailure("Comparing indexes from different sets")
#endif
}
}
@inlinable // FIXME(sil-serialize-all)
public static func < (
lhs: Dictionary<Key, Value>.Index,
rhs: Dictionary<Key, Value>.Index
) -> Bool {
if _fastPath(lhs._guaranteedNative) {
return lhs._nativeIndex < rhs._nativeIndex
}
switch (lhs._value, rhs._value) {
case (._native(let lhsNative), ._native(let rhsNative)):
return lhsNative < rhsNative
#if _runtime(_ObjC)
case (._cocoa(let lhsCocoa), ._cocoa(let rhsCocoa)):
return lhsCocoa < rhsCocoa
default:
_preconditionFailure("Comparing indexes from different sets")
#endif
}
}
@inlinable
public func hash(into hasher: inout Hasher) {
#if _runtime(_ObjC)
if _fastPath(_guaranteedNative) {
hasher.combine(0 as UInt8)
hasher.combine(_nativeIndex.offset)
return
}
switch _value {
case ._native(let nativeIndex):
hasher.combine(0 as UInt8)
hasher.combine(nativeIndex.offset)
case ._cocoa(let cocoaIndex):
hasher.combine(1 as UInt8)
hasher.combine(cocoaIndex.currentKeyIndex)
}
#else
hasher.combine(_nativeIndex.offset)
#endif
}
}
#if _runtime(_ObjC)
@_fixed_layout // FIXME(sil-serialize-all)
@usableFromInline
final internal class _CocoaDictionaryIterator: IteratorProtocol {
@usableFromInline
internal typealias Element = (AnyObject, AnyObject)
// 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.
@usableFromInline // FIXME(sil-serialize-all)
internal var _fastEnumerationState: _SwiftNSFastEnumerationState =
_makeSwiftNSFastEnumerationState()
// This stored property should be stored right after `_fastEnumerationState`.
// There's code below relying on this.
@usableFromInline // FIXME(sil-serialize-all)
internal var _fastEnumerationStackBuf = _CocoaFastEnumerationStackBuf()
@usableFromInline // FIXME(sil-serialize-all)
internal let cocoaDictionary: _NSDictionary
@inlinable // FIXME(sil-serialize-all)
internal var _fastEnumerationStatePtr:
UnsafeMutablePointer<_SwiftNSFastEnumerationState> {
return _getUnsafePointerToStoredProperties(self).assumingMemoryBound(
to: _SwiftNSFastEnumerationState.self)
}
@inlinable // FIXME(sil-serialize-all)
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.
@usableFromInline // FIXME(sil-serialize-all)
internal var itemIndex: Int = 0
@usableFromInline // FIXME(sil-serialize-all)
internal var itemCount: Int = 0
@inlinable // FIXME(sil-serialize-all)
internal init(_ cocoaDictionary: _NSDictionary) {
self.cocoaDictionary = cocoaDictionary
}
@inlinable // FIXME(sil-serialize-all)
internal func next() -> Element? {
if itemIndex < 0 {
return nil
}
let cocoaDictionary = self.cocoaDictionary
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 = cocoaDictionary.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
let value: AnyObject = cocoaDictionary.objectFor(key)!
return (key, value)
}
}
#endif
@usableFromInline
@_frozen // FIXME(sil-serialize-all)
internal enum DictionaryIteratorRepresentation<Key: Hashable, Value> {
@usableFromInline
internal typealias _Iterator = DictionaryIterator<Key, Value>
@usableFromInline
internal typealias _NativeBuffer = _NativeDictionaryBuffer<Key, Value>
@usableFromInline
internal typealias _NativeIndex = _Iterator._NativeIndex
// For native buffer, we keep two indices to keep track of the iteration
// progress and the buffer owner to make the buffer non-uniquely
// referenced.
//
// Iterator is iterating over a frozen view of the collection
// state, so it should keep its own reference to the buffer.
case _native(
start: _NativeIndex, end: _NativeIndex, buffer: _NativeBuffer)
#if _runtime(_ObjC)
case _cocoa(_CocoaDictionaryIterator)
#endif
}
/// An iterator over the members of a `Dictionary<Key, Value>`.
@_fixed_layout // FIXME(sil-serialize-all)
public struct DictionaryIterator<Key: Hashable, Value>: IteratorProtocol {
// Dictionary has a separate IteratorProtocol and Index because of efficiency
// and implementability reasons.
//
// Index for native buffer is efficient. Index for bridged NSDictionary is
// not.
//
// Even though fast enumeration is not suitable for implementing
// Index, which is multi-pass, it is suitable for implementing a
// IteratorProtocol, which is being consumed as iteration proceeds.
@usableFromInline
internal typealias _NativeBuffer = _NativeDictionaryBuffer<Key, Value>
@usableFromInline
internal typealias _NativeIndex = _NativeDictionaryIndex<Key, Value>
@usableFromInline
internal var _state: DictionaryIteratorRepresentation<Key, Value>
@inlinable // FIXME(sil-serialize-all)
internal init(_state: DictionaryIteratorRepresentation<Key, Value>) {
self._state = _state
}
@inlinable // FIXME(sil-serialize-all)
internal static func _native(
start: _NativeIndex, end: _NativeIndex, buffer: _NativeBuffer
) -> DictionaryIterator {
return DictionaryIterator(
_state: ._native(start: start, end: end, buffer: buffer))
}
#if _runtime(_ObjC)
@inlinable // FIXME(sil-serialize-all)
internal static func _cocoa(
_ iterator: _CocoaDictionaryIterator
) -> DictionaryIterator{
return DictionaryIterator(_state: ._cocoa(iterator))
}
#endif
@usableFromInline @_transparent
internal var _guaranteedNative: Bool {
return _canBeClass(Key.self) == 0 || _canBeClass(Value.self) == 0
}
@inlinable // FIXME(sil-serialize-all)
internal mutating func _nativeNext() -> (key: Key, value: Value)? {
switch _state {
case ._native(let startIndex, let endIndex, let buffer):
if startIndex == endIndex {
return nil
}
let result = buffer.assertingGet(startIndex)
_state =
._native(start: buffer.index(after: startIndex), end: endIndex, buffer: buffer)
return result
#if _runtime(_ObjC)
case ._cocoa:
_sanityCheckFailure("internal error: not backed by NSDictionary")
#endif
}
}
/// Advances to the next element and returns it, or `nil` if no next element
/// exists.
///
/// Once `nil` has been returned, all subsequent calls return `nil`.
@inlinable // FIXME(sil-serialize-all)
@inline(__always)
public mutating func next() -> (key: Key, value: Value)? {
if _fastPath(_guaranteedNative) {
return _nativeNext()
}
switch _state {
case ._native:
return _nativeNext()
#if _runtime(_ObjC)
case ._cocoa(let cocoaIterator):
if let (anyObjectKey, anyObjectValue) = cocoaIterator.next() {
let nativeKey = _forceBridgeFromObjectiveC(anyObjectKey, Key.self)
let nativeValue = _forceBridgeFromObjectiveC(anyObjectValue, Value.self)
return (nativeKey, nativeValue)
}
return nil
#endif
}
}
}
extension DictionaryIterator: CustomReflectable {
/// A mirror that reflects the iterator.
public var customMirror: Mirror {
return Mirror(
self,
children: EmptyCollection<(label: String?, value: Any)>())
}
}
extension Dictionary: CustomReflectable {
/// A mirror that reflects the dictionary.
public var customMirror: Mirror {
let style = Mirror.DisplayStyle.dictionary
return Mirror(self, unlabeledChildren: self, displayStyle: style)
}
}
/// Initializes a `Dictionary` from unique members.
///
/// Using a builder can be faster than inserting members into an empty
/// `Dictionary`.
@_fixed_layout // FIXME(sil-serialize-all)
public struct _DictionaryBuilder<Key: Hashable, Value> {
@usableFromInline // FIXME(sil-serialize-all)
internal var _result: Dictionary<Key, Value>
@usableFromInline // FIXME(sil-serialize-all)
internal var _nativeBuffer: _NativeDictionaryBuffer<Key, Value>
@usableFromInline // FIXME(sil-serialize-all)
internal let _requestedCount: Int
@usableFromInline // FIXME(sil-serialize-all)
internal var _actualCount: Int
@inlinable // FIXME(sil-serialize-all)
public init(count: Int) {
_result = Dictionary<Key, Value>(minimumCapacity: count)
_nativeBuffer = _result._variantBuffer.asNative
_requestedCount = count
_actualCount = 0
}
@inlinable // FIXME(sil-serialize-all)
public mutating func add(key newKey: Key, value: Value) {
_nativeBuffer.unsafeAddNew(key: newKey, value: value)
_actualCount += 1
}
@inlinable // FIXME(sil-serialize-all)
public mutating func take() -> Dictionary<Key, Value> {
_precondition(_actualCount >= 0,
"Cannot take the result twice")
_precondition(_actualCount == _requestedCount,
"The number of members added does not match the promised count")
// Finish building the `Dictionary`.
_nativeBuffer.count = _requestedCount
// Prevent taking the result twice.
_actualCount = -1
return _result
}
}
extension Dictionary {
/// Removes and returns the first key-value pair of the dictionary if the
/// dictionary isn't empty.
///
/// The first element of the dictionary is not necessarily the first element
/// added. Don't expect any particular ordering of key-value pairs.
///
/// - Returns: The first key-value pair of the dictionary if the dictionary
/// is not empty; otherwise, `nil`.
///
/// - Complexity: Averages to O(1) over many calls to `popFirst()`.
@inlinable
public mutating func popFirst() -> Element? {
guard !isEmpty else { return nil }
return remove(at: startIndex)
}
/// The total number of key-value pairs that the dictionary can contain without
/// allocating new storage.
@inlinable // FIXME(sil-serialize-all)
public var capacity: Int {
return _variantBuffer.capacity
}
/// Reserves enough space to store the specified number of key-value pairs.
///
/// If you are adding a known number of key-value pairs to a dictionary, use this
/// method to avoid multiple reallocations. This method ensures that the
/// dictionary has unique, mutable, contiguous storage, with space allocated
/// for at least the requested number of key-value pairs.
///
/// Calling the `reserveCapacity(_:)` method on a dictionary with bridged
/// storage triggers a copy to contiguous storage even if the existing
/// storage has room to store `minimumCapacity` key-value pairs.
///
/// - Parameter minimumCapacity: The requested number of key-value pairs to
/// store.
@inlinable // FIXME(sil-serialize-all)
public mutating func reserveCapacity(_ minimumCapacity: Int) {
_variantBuffer.reserveCapacity(minimumCapacity)
_sanityCheck(self.capacity >= minimumCapacity)
}
}
//===--- Bridging ---------------------------------------------------------===//
#if _runtime(_ObjC)
extension Dictionary {
@inlinable // FIXME(sil-serialize-all)
public func _bridgeToObjectiveCImpl() -> _NSDictionaryCore {
switch _variantBuffer {
case _VariantDictionaryBuffer.native(let buffer):
return buffer.bridged()
case _VariantDictionaryBuffer.cocoa(let cocoaBuffer):
return cocoaBuffer.cocoaDictionary
}
}
/// Returns the native Dictionary hidden inside this NSDictionary;
/// returns nil otherwise.
@inlinable // FIXME(sil-serialize-all)
public static func _bridgeFromObjectiveCAdoptingNativeStorageOf(
_ s: AnyObject
) -> Dictionary<Key, Value>? {
// Try all three NSDictionary impls that we currently provide.
if let deferredBuffer = s as? _SwiftDeferredNSDictionary<Key, Value> {
return Dictionary(_nativeBuffer: deferredBuffer.nativeBuffer)
}
if let nativeStorage = s as? _HashableTypedNativeDictionaryStorage<Key, Value> {
return Dictionary(_nativeBuffer:
_NativeDictionaryBuffer(_storage: nativeStorage))
}
if s === _RawNativeDictionaryStorage.empty {
return Dictionary()
}
// FIXME: what if `s` is native storage, but for different key/value type?
return nil
}
}
#endif