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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"