How to get readable stacktrace in IOS build?

Questions & Answers
1

I got the following stacktrace when running ipad build in xcode. How to fill in the blanks, e.g. replace <00000000000000000000000000000000>:0 with actual filename and line number ? I did debug build, checked development build option, set “full” stack traces in options, I use ios 10.1.
Also the code works on windows but after il2cpp it gives me that error. Is il2cpp reliable?

NullReferenceException: Object reference not set to an instance of an object.
  at System.Linq.Expressions.Interpreter.LightLambda.MakeRunDelegateCtor (System.Type delegateType) [0x00000] in <00000000000000000000000000000000>:0
  at System.Linq.Expressions.Interpreter.LightLambda.GetRunDelegateCtor (System.Type delegateType) [0x00000] in <00000000000000000000000000000000>:0
  at System.Linq.Expressions.Interpreter.LightLambda.MakeDelegate (System.Type delegateType) [0x00000] in <00000000000000000000000000000000>:0
  at System.Linq.Expressions.Expression`1[TDelegate].Compile (System.Boolean preferInterpretation) [0x00000] in <00000000000000000000000000000000>:0
  at System.Runtime.CompilerServices.CallSite`1[T].MakeUpdateDelegate () [0x00000] in <00000000000000000000000000000000>:0
  at System.Runtime.CompilerServices.CallSite`1[T].GetUpdateDelegate (T& addr) [0x00000] in <00000000000000000000000000000000>:0
  at System.Runtime.CompilerServices.CallSite`1[T]..ctor (System.Runtime.CompilerServices.CallSiteBinder binder) [0x00000] in <00000000000000000000000000000000>:0
  at System.Runtime.CompilerServices.CallSite`1[T].Create (System.Runtime.CompilerServices.CallSiteBinder binder) [0x00000] in <00000000000000000000000000000000>:0
  at Company.Project.insertObjectArray[TCompanyObject] (System.Collections.Generic.List`1[T] objectArray, Company.IProgressInterface progressInterface) [0x00000] in <00000000000000000000000000000000>:0
  at Company.Project.insert (CCompanyAPIProjectData projectData, Company.IProgressInterface progressInterface, System.String progressLabelBase) [0x00000] in <00000000000000000000000000000000>:0
  at Company.Project.ReplaceProjectData (CCompanyAPIProjectData newProjectData, Company.IProgressInterface progressInterface) [0x00000] in <00000000000000000000000000000000>:0
  at ProjectDataLoader+<LoadProject>d__18.MoveNext () [0x00000] in <00000000000000000000000000000000>:0
  at UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) [0x00000] in <00000000000000000000000000000000>:0
2

IL2CPP does not support C# line numbers in stack traces at the moment, so there is nothing you can do to get them.

Note that in general, the C# Linq expression interpreter (which is where this exception is coming from) doesn’t work too well with IL2CPP. There is a thread here with some details:

https://forum.unity.com/threads/are-c-expression-trees-or-ilgenerator-allowed-on-ios.489498/

You will need at least a link.xml in the project with these contents:

<linker>
  <assembly fullname="System.Core">
   <type fullname="System.Linq.Expressions.Interpreter.LightLambda" preserve="all" />
  </assembly>
</linker>

Even then, you might hit case that IL2CPP cannot handle. I’d recommend against using the LINQ expression interpreter if possible.