To find the package in which the method was found:

use mro          qw( );
use Scalar::Util qw( blessed );

sub get_package {
   my ($obj, $method_name) = @_;
   defined( my $class = blessed($obj) )
      or return undef;

   for my $pkg_name (@{ mro::get_linear_isa($class) }) {
      my $pkg = do {
         no strict qw( refs );
         *{ $pkg_name.'::'.$method_name }
      };
      return $pkg_name if *{$pkg}{CODE};
   }

   return undef;
}
[download]

Note: Doesn't work if the method is autoloaded.

---

To find the package in which the method was compiled:

use B qw( svref_2object );

sub get_package {
   my ($obj, $method_name) = @_;
   my $method_ref = $obj->can($method_name)
      or return undef;

   return svref_2object($method_ref)->GV->STASH->NAME;
}
[download]

Note: Only works for autoloaded methods if can is properly overridden.

Note: Works for methods implemented in XS.

---

To find the file in which the method was compiled:

use B qw( svref_2object );

sub get_package {
   my ($obj, $method_name) = @_;
   my $method_ref = $obj->can($method_name)
      or return undef;

   return svref_2object($method_ref)->FILE;
}
[download]

Note: Only works for autoloaded methods if can is properly overridden.

Note: Only works well for Perl methods. For methods implemented in XS, it returns the name of the .c file with no path. For example, returns XS.c for JSON::XS->encode. (This may vary by system, and by XS loader.)

---

---

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