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|
//===--- BridgeStorage.swift - Discriminated storage for bridged types ----===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 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
//
//===----------------------------------------------------------------------===//
//
// Types that are bridged to Objective-C need to manage an object
// that may be either some native class or the @objc Cocoa
// equivalent. _BridgeStorage discriminates between these two
// possibilities and stores a single extra bit when the stored type is
// native. It is assumed that the @objc class instance may in fact
// be a tagged pointer, and thus no extra bits may be available.
//
//===----------------------------------------------------------------------===//
import SwiftShims
#if !$Embedded
@frozen
@usableFromInline
internal struct _BridgeStorage<NativeClass: AnyObject> {
@usableFromInline
internal typealias Native = NativeClass
@usableFromInline
internal typealias ObjC = AnyObject
// rawValue is passed inout to _isUnique. Although its value
// is unchanged, it must appear mutable to the optimizer.
@usableFromInline
internal var rawValue: Builtin.BridgeObject
@inlinable
@inline(__always)
internal init(native: Native, isFlagged flag: Bool) {
// Note: Some platforms provide more than one spare bit, but the minimum is
// a single bit.
_internalInvariant(_usesNativeSwiftReferenceCounting(NativeClass.self))
rawValue = _makeNativeBridgeObject(
native,
flag ? (1 as UInt) << _objectPointerLowSpareBitShift : 0)
}
@inlinable
@inline(__always)
internal init(objC: ObjC) {
_internalInvariant(_usesNativeSwiftReferenceCounting(NativeClass.self))
rawValue = _makeObjCBridgeObject(objC)
}
@inlinable
@inline(__always)
internal init(native: Native) {
_internalInvariant(_usesNativeSwiftReferenceCounting(NativeClass.self))
rawValue = Builtin.reinterpretCast(native)
}
#if _pointerBitWidth(_64)
@inlinable
@inline(__always)
internal init(taggedPayload: UInt) {
rawValue = _bridgeObject(taggingPayload: taggedPayload)
}
#endif
@inlinable
@inline(__always)
internal mutating func isUniquelyReferencedNative() -> Bool {
return isNative && _isUnique(&rawValue)
}
@_alwaysEmitIntoClient
@inline(__always)
internal mutating func beginCOWMutationNative() -> Bool {
return Bool(Builtin.beginCOWMutation(&rawValue))
}
@inlinable
internal var isNative: Bool {
@inline(__always) get {
let result = Builtin.classifyBridgeObject(rawValue)
return !Bool(Builtin.or_Int1(result.isObjCObject,
result.isObjCTaggedPointer))
}
}
@inlinable
static var flagMask: UInt {
@inline(__always) get {
return (1 as UInt) << _objectPointerLowSpareBitShift
}
}
@inlinable
internal var isUnflaggedNative: Bool {
@inline(__always) get {
return (_bitPattern(rawValue) &
(_bridgeObjectTaggedPointerBits | _objCTaggedPointerBits |
_objectPointerIsObjCBit | _BridgeStorage.flagMask)) == 0
}
}
@inlinable
internal var isObjC: Bool {
@inline(__always) get {
return !isNative
}
}
@inlinable
internal var nativeInstance: Native {
@inline(__always) get {
_internalInvariant(isNative)
return Builtin.castReferenceFromBridgeObject(rawValue)
}
}
@inlinable
internal var unflaggedNativeInstance: Native {
@inline(__always) get {
_internalInvariant(isNative)
_internalInvariant(_nonPointerBits(rawValue) == 0)
return Builtin.reinterpretCast(rawValue)
}
}
@inlinable
@inline(__always)
internal mutating func isUniquelyReferencedUnflaggedNative() -> Bool {
_internalInvariant(isNative)
return _isUnique_native(&rawValue)
}
@_alwaysEmitIntoClient
@inline(__always)
internal mutating func beginCOWMutationUnflaggedNative() -> Bool {
_internalInvariant(isNative)
return Bool(Builtin.beginCOWMutation_native(&rawValue))
}
@_alwaysEmitIntoClient
@inline(__always)
internal mutating func endCOWMutation() {
_internalInvariant(isNative)
Builtin.endCOWMutation(&rawValue)
}
@inlinable
internal var objCInstance: ObjC {
@inline(__always) get {
_internalInvariant(isObjC)
return Builtin.castReferenceFromBridgeObject(rawValue)
}
}
}
#else
@frozen
@usableFromInline
internal struct _BridgeStorage<NativeClass: AnyObject> {
@usableFromInline
internal typealias Native = NativeClass
// rawValue is passed inout to _isUnique. Although its value
// is unchanged, it must appear mutable to the optimizer.
@usableFromInline
internal var rawValue: NativeClass
@inlinable
@inline(__always)
internal init(native: Native) {
_internalInvariant(_usesNativeSwiftReferenceCounting(NativeClass.self))
rawValue = native
}
@inlinable
@inline(__always)
internal mutating func isUniquelyReferencedNative() -> Bool {
return _isUnique(&rawValue)
}
@_alwaysEmitIntoClient
@inline(__always)
internal mutating func beginCOWMutationNative() -> Bool {
return Bool(Builtin.beginCOWMutation(&rawValue))
}
@inlinable
static var flagMask: UInt {
@inline(__always) get {
return (1 as UInt) << _objectPointerLowSpareBitShift
}
}
@inlinable
internal var nativeInstance: Native {
@inline(__always) get {
return rawValue
}
}
@inlinable
internal var unflaggedNativeInstance: Native {
@inline(__always) get {
return rawValue
}
}
@inlinable
@inline(__always)
internal mutating func isUniquelyReferencedUnflaggedNative() -> Bool {
return _isUnique_native(&rawValue)
}
@_alwaysEmitIntoClient
@inline(__always)
internal mutating func beginCOWMutationUnflaggedNative() -> Bool {
return Bool(Builtin.beginCOWMutation_native(&rawValue))
}
@_alwaysEmitIntoClient
@inline(__always)
internal mutating func endCOWMutation() {
Builtin.endCOWMutation(&rawValue)
}
}
#endif
|
