Bug 280924 – WebKit's Swift overlay calls actor-isolated code from a nonisolated context

• Component: Tools / Tests
• Status: RESOLVED FIXED

[Elliott Williams]

Early builds of WebKit's merged Swift overlay in <https://bugs.webkit.org/show_bug.cgi?id=280734> show some actor isolation errors. The Swift toolchain used in Xcode 13 elevates these to errors, whereas more recent Xcodes treat them as warnings:

    /Volumes/Data/worker/macOS-Ventura-Release-Build-EWS/build/Source/WebKit/UIProcess/API/Cocoa/WebKitSwiftOverlay.swift:70:58: error: call to main actor-isolated initializer 'init()' in a synchronous nonisolated context
        public func pdf(configuration: WKPDFConfiguration = .init()) async throws -> Data {
    WebKit.WKPDFConfiguration:4:12: note: calls to initializer 'init()' from outside of its actor context are implicitly asynchronous
        public init()
    /Volumes/Data/worker/macOS-Ventura-Release-Build-EWS/build/Source/WebKit/UIProcess/API/Cocoa/WebKitSwiftOverlay.swift:78:78: error: call to main actor-isolated initializer 'init()' in a synchronous nonisolated context
        public func find(_ string: String, configuration: WKFindConfiguration = .init()) async throws -> WKFindResult {
    WebKit.WKFindConfiguration:5:12: note: calls to initializer 'init()' from outside of its actor context are implicitly asynchronous
        public init()

[Radar WebKit Bug Importer]

<rdar://problem/137317585>

[Elliott Williams]

Pull request: https://github.com/WebKit/WebKit/pull/36002

[EWS]

Committed 286620@main (967f1ef0f0c8): <https://commits.webkit.org/286620@main>

Reviewed commits have been landed. Closing PR #36002 and removing active labels.