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Re: Perl debugging issue (line not breakable)

by LanX (Bishop)
on Feb 05, 2013 at 12:52 UTC ( #1017148=note: print w/replies, xml ) Need Help??

in reply to Perl debugging issue

We need more infos what you did!

Did you manually try to set a breakpoint? Maybe in a BEGIN-block?

If not, do you have any debugger code in your script?

Try grepping for things starting with "DB::"

Cheers Rolf


Not every source line results in an atomic step at run-time where you can set a breakpoint.


  • Many lines are grouped together into one step.
  • They were only relevant at compile-time.
  • Were NOPs (no-operations) like empty lines or comments
  • ...

See the following snippet from "Programming Perl" for examples:

To look at a "window" of source code around the breakpoint, use the w command:

DB<2> w 5 } 6 7 sub infested { 8==>b my $bugs = int rand(3); 9: our $Master; 10: contaminate($Master); 11: warn "needs wash" 12 if $Master && $Master->isa("Human"); 13 14: print "got $bugs\n"; DB<2>

As you see by the ==> marker, your current line is line 8, and by the b there, you know it has a breakpoint on it. If you had set an action, there also would also have been an a there. The line numbers with colons are breakable; the rest are not.

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