[erlang-questions] How to get the line number of current executable code?

Richard Carlsson <>
Tue Aug 26 11:15:38 CEST 2008


Mats Cronqvist wrote:
>  it is not true that the only way to inspect the stack is by forcing an
> exception.
> 
>  i'm too lazy to write actual code, but try this in the shell;
> 
> ()41> {_,BT}=erlang:process_info(self(),backtrace).
> ()42> S=fun(B,{_,[_,{F,L}|_]})->
> <<_:F/binary,R:L/binary,_/binary>> =B, R end.
> ()43> S(BT,re:run(BT,"Return
> addr\\s[0-9a-z]+\\s\\(([^\\s]*)")).
> <<"erl_eval:expr/5">>

Ugh! I didn't know that flag to process_info existed, but I'm happy to
see that Mats' talent for sniffing out the dark corners of Erlang and
using them for unspeakable deeds is as strong as ever.

    /Richard




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