How Do I Recover a Stack Trace in Swift?

Question

How do I recover the stack trace in Swift, so that I can find out which method was the last one called before a crash?

What I want to replicate in Swift is this method in C#:

public static Assembly GetComponentInInvocationDegree(int invocationDegree)
    {
        if (invocationDegree < 0) throw new ArgumentOutOfRangeException("Cannot set out of range value: invocation degree must be greater than or equal to zero");

        var stackInvocacion = new StackTrace().GetFrames();
        if (invocationDegree > 0)
        {
            int invokingAssemblyIndex = 0;
            string currentDegreeComponentName;
            try
            {
                for (int currentDegree = 0; currentDegree < invocationDegree; currentDegree++)
                {
                    currentDegreeComponentName = stackInvocacion[invokingAssemblyIndex].GetMethod().ReflectedType.Assembly.GetName().Name;
                    while (stackInvocacion[invokingAssemblyIndex].GetMethod().ReflectedType.Assembly.GetName().Name == currentDegreeComponentName) invokingAssemblyIndex++;                        
                }
            }
            catch (Exception ex) { throw new InvalidOperationException(string.Format("Cannot get component in invocation degree: invocation degree {0} does not exist", invocationDegree), ex); }

            return stackInvocacion[invokingAssemblyIndex].GetMethod().ReflectedType.Assembly;
        }

        return stackInvocacion[0].GetMethod().ReflectedType.Assembly;
    }

May I humbly offer http://support.hockeyapp.net/kb/client-integration-ios-mac-os-x/hockeyapp-for-ios? Doesn't `BITHockeyManager` achieve this goal? — SwiftArchitect, Jul 14 '15 at 01:31

score 7 · Accepted Answer · answered Jul 16 '15 at 19:19

7

In many cases, you could use a try/catch mechanism.

do {
    try ... // risky business goes here
} catch let error as NSError {
    print("Error: \(error.domain)")
    println(NSThread.callStackSymbols())
}

answered Jul 16 '15 at 19:19

SwiftArchitect

45,394
26
137
173

5

won't that just print the call stack symbols for the method that catches the error rather than the one throwing it? – Hogdotmac Jun 26 '17 at 16:20
That prints the variables / symbols but not the stack _trace_ afaict. – WestCoastProjects May 25 '20 at 23:14

score 2 · Answer 2 · edited Sep 16 '21 at 04:24

2

In swift 3 and above, you can do it like this:

do {
    //....
}
catch {
    print("error occurred")
    print(Thread.callStackSymbols)
}

edited Sep 16 '21 at 04:24

Rhythmic Fistman

33,182
5
81
149

answered Jun 01 '21 at 05:13

david euler

603
8
11

How Do I Recover a Stack Trace in Swift?

2 Answers2