I haven't been able to find an answer to this in my (probably limited) reading of perlvar and perldebguts. I'm trying to provide access to the text of subroutines from within a program. I can get the line numbers of the defined routines just fine using the %DB::sub hash and setting bits in $^P. But there doesn't seem to be anything in the source text arrays (the ones that are named @{"_<$filename"} for a given $filename) unless I also specify the -d switch. Is there some way to get this text into my program without -d? (Yes, I realize that I could go and read the files, but this is a speed optimization I'd like to do).

The following program prints the source text when called with -d, but not without it: 

use strict;
package DB;
BEGIN { $^P |= 0x310 }

package main;

sub a
{
 print "this is a test";
}

printf("\$^P is %x\n", $^P);

while (my ($name, $range)  = each(%DB::sub))
{
 my ($filename, $start, $end) = $range =~ /(.+):(\d*)-(\d*)/;
 next if $filename =~ /^\(/;
 print "$name\t$filename\t$start - $end\n";
 no strict 'refs';
 my $lines = \@{'_<' . $filename};
 foreach my $lineNumber ($start .. $end)
 {
  my $line = $$lines[$lineNumber];
  print $line;
 }
}

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Edit ar0n -- fixed title

In reply to Using @{"_<$filename"} by bikeNomad

Title:
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