Swift-demangle hangs when trying to demangle string that starts with $S

I am trying to demangle a string that I found via dwarfdump. The string is $S8BullsEye14ViewControllerC9showAlertyyF. If I run xcrun swift-demangle -compact $S8BullsEye14ViewControllerC9showAlertyyF, it just hangs and never comes back. Is there a way to debug this and understand why this is happening? If I checkout the swift-4.2-RELASE tag, how can I debug this?

The problem is $ is a special character in many shells. You need to escape (\$) it like this:

xcrun swift-demangle -compact \$S8BullsEye14ViewControllerC9showAlertyyF
BullsEye.ViewController.showAlert() -> ()

You can also omit the $ to make this easier:

xcrun swift-demangle -compact S8BullsEye14ViewControllerC9showAlertyyF
BullsEye.ViewController.showAlert() -> ()
3 Likes

Thanks! I always forget that for some reason. I knew it had to be something I was doing :D.

Another option, on macOS, is to use pbpaste to pass the symbol.

pbpaste | xcrun swift-demangle

In addition to working with single symbols, this mode also handles symbols embedded in regular text, which is useful for stack traces.

For example if I copy the original question text and run, the output is:

I am trying to demangle a string that I found via dwarfdump. The string is BullsEye.ViewController.showAlert() -> () with unmangled suffix "." If I run xcrun swift-demangle -compact BullsEye.ViewController.showAlert() -> (), it just hangs and never comes back.

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