Strange stacktrace reported by Google Play Console

问题

I'm getting this kind of stacktraces in the crash reports provided by Google Play Console:

  at com.example.ClassA.createInstance (ClassA.java)
  or                     .op1(ClassA.java)
  or                     .op2(ClassA.java)
  or                     .op3 (ClassA.java)
  or                     .op4 (ClassA.java)

Does anybody knows why are "or"(s) in the stacktrace? I'm guessing is something about the code obfuscation.

Thanks.

来源：https://stackoverflow.com/questions/46608036/strange-stacktrace-reported-by-google-play-console