Revert "[6.0] Reduce overhead of .expectationChecked event handling in #expect(). (swiftlang#657)"

This reverts commit 3e30663.

Author: ahoppen

Package.swift

@@ -148,7 +148,6 @@ extension Array where Element == PackageDescription.SwiftSetting {
       .enableExperimentalFeature("AvailabilityMacro=_clockAPI:macOS 13.0, iOS 16.0, watchOS 9.0, tvOS 16.0"),
       .enableExperimentalFeature("AvailabilityMacro=_regexAPI:macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0"),
       .enableExperimentalFeature("AvailabilityMacro=_swiftVersionAPI:macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0"),
-      .enableExperimentalFeature("AvailabilityMacro=_synchronizationAPI:macOS 15.0, iOS 18.0, watchOS 11.0, tvOS 18.0, visionOS 2.0"),
 
       .enableExperimentalFeature("AvailabilityMacro=_distantFuture:macOS 99.0, iOS 99.0, watchOS 99.0, tvOS 99.0, visionOS 99.0"),
     ]

Sources/Testing/Expectations/ExpectationChecking+Macro.swift

@@ -95,10 +95,8 @@ public func __checkValue(
   // Post an event for the expectation regardless of whether or not it passed.
   // If the current event handler is not configured to handle events of this
   // kind, this event is discarded.
-  lazy var expectation = Expectation(evaluatedExpression: expression, isPassing: condition, isRequired: isRequired, sourceLocation: sourceLocation)
-  if Configuration.deliverExpectationCheckedEvents {
-    Event.post(.expectationChecked(expectation))
-  }
+  var expectation = Expectation(evaluatedExpression: expression, isPassing: condition, isRequired: isRequired, sourceLocation: sourceLocation)
+  Event.post(.expectationChecked(expectation))
 
   // Early exit if the expectation passed.
   if condition {

Sources/Testing/Parameterization/TypeInfo.swift

@@ -74,9 +74,6 @@ public struct TypeInfo: Sendable {
 // MARK: - Name
 
 extension TypeInfo {
-  /// An in-memory cache of fully-qualified type name components.
-  private static let _fullyQualifiedNameComponentsCache = Locked<[ObjectIdentifier: [String]]>()
-
   /// The complete name of this type, with the names of all referenced types
   /// fully-qualified by their module names when possible.
   ///
@@ -95,10 +92,6 @@ extension TypeInfo {
   public var fullyQualifiedNameComponents: [String] {
     switch _kind {
     case let .type(type):
-      if let cachedResult = Self._fullyQualifiedNameComponentsCache.rawValue[ObjectIdentifier(type)] {
-        return cachedResult
-      }
-
       var result = String(reflecting: type)
         .split(separator: ".")
         .map(String.init)
@@ -116,10 +109,6 @@ extension TypeInfo {
       // those out as they're uninteresting to us.
       result = result.filter { !$0.starts(with: "(unknown context at") }
 
-      Self._fullyQualifiedNameComponentsCache.withLock { fullyQualifiedNameComponentsCache in
-        fullyQualifiedNameComponentsCache[ObjectIdentifier(type)] = result
-      }
-
       return result
     case let .nameOnly(fullyQualifiedNameComponents, _, _):
       return fullyQualifiedNameComponents

Sources/Testing/Running/Runner.RuntimeState.swift

@@ -8,8 +8,6 @@
 // See https://swift.org/CONTRIBUTORS.txt for Swift project authors
 //
 
-private import Synchronization
-
 extension Runner {
   /// A type which collects the task-scoped runtime state for a running
   /// ``Runner`` instance, the tests it runs, and other objects it interacts
@@ -113,10 +111,7 @@ extension Configuration {
   /// - Returns: A unique number identifying `self` that can be
   ///   passed to `_removeFromAll(identifiedBy:)`` to unregister it.
   private func _addToAll() -> UInt64 {
-    if deliverExpectationCheckedEvents, #available(_synchronizationAPI, *) {
-      Self._deliverExpectationCheckedEventsCount.add(1, ordering: .sequentiallyConsistent)
-    }
-    return Self._all.withLock { all in
+    Self._all.withLock { all in
       let id = all.nextID
       all.nextID += 1
       all.instances[id] = self
@@ -128,37 +123,12 @@ extension Configuration {
   ///
   /// - Parameters:
   ///   - id: The unique identifier of this instance, as previously returned by
-  ///     `_addToAll()`.
-  private func _removeFromAll(identifiedBy id: UInt64) {
-    let configuration = Self._all.withLock { all in
-      all.instances.removeValue(forKey: id)
-    }
-    if let configuration, configuration.deliverExpectationCheckedEvents, #available(_synchronizationAPI, *) {
-      Self._deliverExpectationCheckedEventsCount.subtract(1, ordering: .sequentiallyConsistent)
-    }
-  }
-
-  /// An atomic counter that tracks the number of "current" configurations that
-  /// have set ``deliverExpectationCheckedEvents`` to `true`.
-  ///
-  /// On older Apple platforms, this property is not available and ``all`` is
-  /// directly consulted instead (which is less efficient.)
-  @available(_synchronizationAPI, *)
-  private static let _deliverExpectationCheckedEventsCount = Atomic(0)
-
-  /// Whether or not events of the kind
-  /// ``Event/Kind-swift.enum/expectationChecked(_:)`` should be delivered to
-  /// the event handler of _any_ configuration set as current for a task in the
-  /// current process.
-  ///
-  /// To determine if an individual instance of ``Configuration`` is listening
-  /// for these events, consult the per-instance
-  /// ``Configuration/deliverExpectationCheckedEvents`` property.
-  static var deliverExpectationCheckedEvents: Bool {
-    if #available(_synchronizationAPI, *) {
-      _deliverExpectationCheckedEventsCount.load(ordering: .sequentiallyConsistent) > 0
-    } else {
-      all.contains(where: \.deliverExpectationCheckedEvents)
+  ///     `_addToAll()`. If `nil`, this function has no effect.
+  private func _removeFromAll(identifiedBy id: UInt64?) {
+    if let id {
+      Self._all.withLock { all in
+        _ = all.instances.removeValue(forKey: id)
+      }
     }
   }
 }

Tests/TestingTests/MiscellaneousTests.swift

@@ -532,15 +532,4 @@ struct MiscellaneousTests {
     failureBreakpoint()
     #expect(failureBreakpointValue == 1)
   }
-
-  @available(_clockAPI, *)
-  @Test("Repeated calls to #expect() run in reasonable time", .disabled("time-sensitive"))
-  func repeatedlyExpect() {
-    let duration = Test.Clock().measure {
-      for _ in 0 ..< 1_000_000 {
-        #expect(true as Bool)
-      }
-    }
-    #expect(duration < .seconds(1))
-  }
 }