Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
As the following demo shows is caller(1) reporting the name of the calling sub + package.

In the case of a named subroutine one is able to get the code-ref of the caller by inspecting the STASH.

But this doesn't work with anonymous subs.

Caller claims they are part of the stash (here main::__ANON__ ) but accessing the associated code-ref fails. It most likely a newly autovivificated code-ref.

Any better way to get the callers code-ref?

First the output

CURRENT SUB: CODE(0x24c9198) main::upper CODE(0x24c9198) CURRENT SUB: CODE(0x24e8568) main::__ANON__ CODE(0x24c0580) # <--- OOPS

Here the demo:

use strict; use warnings; use Data::Dump qw/pp dd/; use feature "current_sub","say"; sub lower { my %caller; package DB { @caller{ qw/ package filename line subroutine hasarg +s wantarray evaltext is_require hints bitmas +k hinthash / } = caller(1); }; my $caller_name = $caller{subroutine}; my $caller_ref =\&{$caller_name};; say $caller_name," ",$caller_ref; } # --- normal sub upper { say "CURRENT SUB: ",__SUB__; lower( "UPPER" ); } upper(); # --- ano sub my $ano = sub { say "CURRENT SUB: ",__SUB__; lower("ANNO"); }; $ano->();

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery


In reply to Getting code-ref of anonymous caller by LanX

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (2)
As of 2021-09-22 02:23 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?