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6c26b80e6e
Some cases of using isSuperset can cause crashes, this was caused by improper subclassing callouts; this pr resolves those failures (and provides unit tests for that case) The cases where the bridge was traversed too much now only causes a single bridge out call (without needing to reallocate or thrash retain/release) String.components(separatedBy: CharacterSet) should be considerably faster now not only for more apporpriate bridging calls but also no longer needing to bridge arrays back and forth. Resolves the following issues: rdar://problem/17281998 rdar://problem/26611771 rdar://problem/29738989
71 lines
2.8 KiB
Swift
71 lines
2.8 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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@_exported import Foundation // Clang module
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/// A class type which acts as a handle (pointer-to-pointer) to a Foundation reference type which has only a mutable class (e.g., NSURLComponents).
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///
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/// Note: This assumes that the result of calling copy() is mutable. The documentation says that classes which do not have a mutable/immutable distinction should just adopt NSCopying instead of NSMutableCopying.
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internal final class _MutableHandle<MutableType : NSObject>
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where MutableType : NSCopying {
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fileprivate var _pointer : MutableType
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init(reference : MutableType) {
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_pointer = reference.copy() as! MutableType
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}
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init(adoptingReference reference: MutableType) {
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_pointer = reference
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}
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/// Apply a closure to the reference type.
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func map<ReturnType>(_ whatToDo : (MutableType) throws -> ReturnType) rethrows -> ReturnType {
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return try whatToDo(_pointer)
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}
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func _copiedReference() -> MutableType {
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return _pointer.copy() as! MutableType
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}
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func _uncopiedReference() -> MutableType {
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return _pointer
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}
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}
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/// Describes common operations for Foundation struct types that are bridged to a mutable object (e.g. NSURLComponents).
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internal protocol _MutableBoxing : ReferenceConvertible {
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var _handle : _MutableHandle<ReferenceType> { get set }
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/// Apply a mutating closure to the reference type, regardless if it is mutable or immutable.
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///
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/// This function performs the correct copy-on-write check for efficient mutation.
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mutating func _applyMutation<ReturnType>(_ whatToDo : (ReferenceType) -> ReturnType) -> ReturnType
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}
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extension _MutableBoxing {
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@inline(__always)
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mutating func _applyMutation<ReturnType>(_ whatToDo : (ReferenceType) -> ReturnType) -> ReturnType {
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// Only create a new box if we are not uniquely referenced
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if !isKnownUniquelyReferenced(&_handle) {
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let ref = _handle._pointer
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_handle = _MutableHandle(reference: ref)
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}
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return whatToDo(_handle._pointer)
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}
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}
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internal enum _MutableUnmanagedWrapper<ImmutableType : NSObject, MutableType : NSObject>
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where MutableType : NSMutableCopying{
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case Immutable(Unmanaged<ImmutableType>)
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case Mutable(Unmanaged<MutableType>)
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}
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