Tracing and saving line number of a function call

General Usage
1

I’m trying to trace the filename and line of a function call to use it later in the program.

Using stacktrace() in code below, but my goal is revealing line 6 number, and so far I got to knowing line 3.

function trace()
    # do something
    stacktrace() # this is line 3
end

a = trace() # this is line 6

for x in a
    println(x)
end   

#trace() at trace.jl:3
#top-level scope at none:0
2

Can’t you use @__LINE__ and @__FILE__?

3 Likes
3

Thanks for the clue! I probably can use @__FILE__ and @__LINE__ if I pass them explicitly into trace function:

struct Location
    file:: String
    line:: Integer
end

function calledfrom(file, line)
   Location(file, line)
end

x = calledfrom(@__FILE__, @__LINE__)

Originally, I wanted a calledfrom() to work without arguments. Do you think it is possible?

4

Here is what I was looking for:

macro macro_caller_lineno()
    return __source__.line
end

a = @macro_caller_lineno # this will be 5

Described in this commit in Julia codebase.