问题
Seems sometimes lldb can autocomplete a expression but sometimes this feature break.
回答1:
The lldb command line has auto-completion for a bunch of commands and options, but not for the expressions you are typing in the print (i.e. expr) command. If you are using Xcode, that will suggest auto-completions using its source analysis tools. If you find instances where that isn't working, file a bug with http://bugreporter.apple.com and the Xcode folks can take a look.
来源：https://stackoverflow.com/questions/37612340/when-can-lldb-autocomplete-expression