How to show the caller back to Julia?
Is there a way to get the file / name / line information for the caller Julia?
I found this way to get information about the stacktrace , and if the caller is another function (but not the main context), I get a file: line info:
module pd
global g_bTraceOn = true
export callerOfTraceIt
function callerOfTraceIt()
traceit( "hi" ) ;
end
function traceit( msg )
global g_bTraceOn
if ( g_bTraceOn )
bt = backtrace() ;
s = sprint(io->Base.show_backtrace(io, bt))
println( "debug: $s: $msg" )
end
end
end
using pd
callerOfTraceIt( )
It shows:
$ julia bt.jl
debug:
in traceit at C:\cygwin64\home\Peeter\julia\HarmonicBalance\bt.jl:15
in callerOfTraceIt at C:\cygwin64\home\Peeter\julia\HarmonicBalance\bt.jl:8
in include at boot.jl:245
in include_from_node1 at loading.jl:128
in process_options at client.jl:285
in _start at client.jl:354: hi
I would love just the second frame (the one calling traceit ()), and would also love the function name if available.
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If you execute @show bt
internally traceit
, you only find a list of pointers in it, each corresponding to a single stack of stacks. These stack frames, which come from julia code (not C), are rendered show_backtrace
.
You can call Profile.lookup(uint(bt[1]))
to extract file / function / line information from each element:
julia> Profile.lookup(uint(bt[1]))
LineInfo("rec_backtrace","/home/tim/src/julia-old/usr/bin/../lib/libjulia.so",-1,true,140293228378757)
julia> names(Profile.LineInfo)
5-element Array{Symbol,1}:
:func
:file
:line
:fromC
:ip
You probably want to ignore all elements with fromC == true
.
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