Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical
 
PerlMonks  

Re: Perl debug. How do I find calling line number?

by strat (Canon)
on Sep 26, 2004 at 10:45 UTC ( #393918=note: print w/replies, xml ) Need Help??


in reply to Perl debug. How do I find calling line number?

For development- or debugging-purpose I like to use something like the following piece of code:

# somewhere at the beginning of the code $SIG{__WARN__} = \&Warning; $SIG{__DIE__} = \&Die; # anywhere # ------------------------------------------------------------ sub Warning { my @text = @_; warn "------------------------------------------------------------ +\n"; warn "WARNING: @text\n"; my $count = 0; { my ($package, $filename, $line, $sub) = caller($count); last unless defined $line; warn sprintf("%02i %5i %-35s %-20s\n", $count++, $line, $sub, $filename); redo; } } # Warning # ------------------------------------------------------------ sub Die { my @text = @_; warn "------------------------------------------------------------ +\n"; warn "FATAL ERROR: @text\n"; my $count = 0; { my ($package, $filename, $line, $sub) = caller($count); last unless defined $line; warn sprintf("%02i %5i %-35s %-20s\n", $count++, $line, $sub, $filename); redo; } exit 1; } # Die # ------------------------------------------------------------

This installs "signal handlers" for die and warn which are executed every time when the functions die and warn are executed and print a backtrace on how the line the warning or die was produced was reached...

Best regards,
perl -e "s>>*F>e=>y)\*martinF)stronat)=>print,print v8.8.8.32.11.32"

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://393918]
help
Chatterbox?
[LanX]: they?
[LanX]: click!
[choroba]: they
[LanX]: why do you think it's more than one person?
[Your Mother]: Because we are LEGION! Fix YOUR SIG SIG BLOCK!!!!
[Your Mother]: Forgot to sign in as my sockpuppet, how embarrassing!
[1nickt]: pryrt I am creating a Type to check valid user IDs, which must be a whole number greater than or equal to zero. I would like to disallow 1.0 but because of this behaviour, by the time it is checked by the constraint, it *is* an Int.
[LanX]: should this be considered? Re: Parsing .txt into arrays
[LanX]: and this Re^4: Hash user input
[pryrt]: LanX, I would vote "keep" if it were considered: it's not helpful, but it could be taken multiple ways, not all of which are offenseive...

How do I use this? | Other CB clients
Other Users?
Others meditating upon the Monastery: (15)
As of 2017-05-24 20:11 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?