Memory crash at String._bridgeToObjectiveCImpl()

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nehapundlik OP

Created 1d

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I'll describe my crash with an example, looking for some insights into the reason why this is happening.

@objc public protocol LauncherContainer { var launcher: Launcher { get } }

@objc public protocol Launcher: UIViewControllerTransitioningDelegate { func initiateLaunch(url: URL, launchingHotInstance: Bool) }

@objc final class LauncherContainer: NSObject, LauncherContainer, TabsContentCellTapHandler { ... init( ... ) { ... super.init() }

...

// // ContentCellTapHandler // public func tabContentCellItemDidTap( tabId: String ) { ... launcher.initiateNewTabNavigation( tabId: tabId // Crash happens here ) }

public class Launcher: NSObject, Launcher, FooterPillTapHandler { public func initiateNewTabNavigation(tabId: String) { ... } }

public protocol TabsContentCellTapHandler: NSObject { func tabContentCellItemDidTap( tabId: String, } Crash stack last 2 lines are- libswiftCore.dylib swift_unknownObjectRetain libswiftCore.dylib String._bridgeToObjectiveCImpl() String._bridgeToObjectiveCImpl() gets called when the caller and implementation is in Swift file I believe due to @objc class LauncherContainer there'd be bridging header generated. Does that mean tabId passed to tabContentCellItemDidTap is a String but the one passed to initiateNewTabNavigation is NSString? TabId is UUID().uuidString if that helps. Wondering if UUID().uuidString has something to do with this. Thanks a ton for helping. Please find attached screenshot of the stack trace.

Screenshot 2024-11-06 at 9.03.11 AM.png

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Answer 1

Hemanth.Alluri OP

1d

The crash you are experiencing at String._bridgeToObjectiveCImpl() likely stems from issues related to Swift and Objective-C interoperability, particularly with how strings are bridged between the two languages.

Potential Causes and Solutions

Memory Management Issues:

Ensure that the launcher object is properly retained while you are using it. If it gets deallocated before the method call, it could lead to accessing invalid memory. If you have any custom memory management (e.g., manual retain/release), ensure that you are following Swift's ARC (Automatic Reference Counting) rules correctly.

Check for Optional Values:

Ensure that tabId is not nil when passed to initiateNewTabNavigation. If it's an optional string and you attempt to bridge a nil value, it could lead to a crash. Use optional binding to safely unwrap tabId before passing it

if let validTabId = tabId {
    launcher.initiateNewTabNavigation(tabId: validTabId)
}

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