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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Atomics open source project
//
// Copyright (c) 2020 - 2023 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
//
//===----------------------------------------------------------------------===//
extension RawRepresentable
where
Self: AtomicValue,
RawValue: AtomicValue,
RawValue.AtomicRepresentation.Value == RawValue
{
public typealias AtomicRepresentation = AtomicRawRepresentableStorage<Self>
}
/// The default atomic storage representation for an atomic `RawRepresentable`
/// type whose `RawValue` conforms to `AtomicValue`.
@frozen
public struct AtomicRawRepresentableStorage<Value>: AtomicStorage
where
Value: RawRepresentable,
Value.RawValue: AtomicValue,
Value.RawValue.AtomicRepresentation.Value == Value.RawValue
{
@usableFromInline
internal typealias _Storage = Value.RawValue.AtomicRepresentation
@usableFromInline
internal var _storage: _Storage
@_transparent @_alwaysEmitIntoClient
public init(_ value: __owned Value) {
_storage = _Storage(value.rawValue)
}
@_transparent @_alwaysEmitIntoClient
public func dispose() -> Value {
Value(rawValue: _storage.dispose())!
}
@_transparent @_alwaysEmitIntoClient
internal static func _extract(
_ ptr: UnsafeMutablePointer<Self>
) -> UnsafeMutablePointer<_Storage> {
// `Self` is layout-compatible with its only stored property.
UnsafeMutableRawPointer(ptr).assumingMemoryBound(to: _Storage.self)
}
@_semantics("atomics.requires_constant_orderings")
@_transparent @_alwaysEmitIntoClient
public static func atomicLoad(
at pointer: UnsafeMutablePointer<Self>,
ordering: AtomicLoadOrdering
) -> Value {
let raw = _Storage.atomicLoad(at: _extract(pointer), ordering: ordering)
return Value(rawValue: raw)!
}
@_semantics("atomics.requires_constant_orderings")
@_transparent @_alwaysEmitIntoClient
public static func atomicStore(
_ desired: Value,
at pointer: UnsafeMutablePointer<Self>,
ordering: AtomicStoreOrdering
) {
_Storage.atomicStore(
desired.rawValue, at: _extract(pointer), ordering: ordering)
}
@_semantics("atomics.requires_constant_orderings")
@_transparent @_alwaysEmitIntoClient
public static func atomicExchange(
_ desired: Value,
at pointer: UnsafeMutablePointer<Self>,
ordering: AtomicUpdateOrdering
) -> Value {
let raw = _Storage.atomicExchange(
desired.rawValue, at: _extract(pointer), ordering: ordering)
return Value(rawValue: raw)!
}
@_semantics("atomics.requires_constant_orderings")
@_transparent @_alwaysEmitIntoClient
public static func atomicCompareExchange(
expected: Value,
desired: Value,
at pointer: UnsafeMutablePointer<Self>,
ordering: AtomicUpdateOrdering
) -> (exchanged: Bool, original: Value) {
let raw = _Storage.atomicCompareExchange(
expected: expected.rawValue,
desired: desired.rawValue,
at: _extract(pointer),
ordering: ordering)
return (raw.exchanged, Value(rawValue: raw.original)!)
}
@_semantics("atomics.requires_constant_orderings")
@_transparent @_alwaysEmitIntoClient
public static func atomicCompareExchange(
expected: Value,
desired: Value,
at pointer: UnsafeMutablePointer<Self>,
successOrdering: AtomicUpdateOrdering,
failureOrdering: AtomicLoadOrdering
) -> (exchanged: Bool, original: Value) {
let raw = _Storage.atomicCompareExchange(
expected: expected.rawValue,
desired: desired.rawValue,
at: _extract(pointer),
successOrdering: successOrdering,
failureOrdering: failureOrdering)
return (raw.exchanged, Value(rawValue: raw.original)!)
}
@_semantics("atomics.requires_constant_orderings")
@_transparent @_alwaysEmitIntoClient
public static func atomicWeakCompareExchange(
expected: Value,
desired: Value,
at pointer: UnsafeMutablePointer<Self>,
successOrdering: AtomicUpdateOrdering,
failureOrdering: AtomicLoadOrdering
) -> (exchanged: Bool, original: Value) {
let raw = _Storage.atomicWeakCompareExchange(
expected: expected.rawValue,
desired: desired.rawValue,
at: _extract(pointer),
successOrdering: successOrdering,
failureOrdering: failureOrdering)
return (raw.exchanged, Value(rawValue: raw.original)!)
}
}
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