Returns the context of the current subroutine call. In scalar context,
returns the caller's package name if there is a caller, that is, if
we're in a subroutine or
require, and the undefined value
otherwise. In list context, returns
- # 0 1 2
- ($package, $filename, $line) = caller;
With EXPR, it returns some extra information that the debugger uses to print a stack trace. The value of EXPR indicates how many call frames to go back before the current one.
- # 0 1 2 3 4
- ($package, $filename, $line, $subroutine, $hasargs,
- # 5 6 7 8 9
- $wantarray, $evaltext, $is_require, $hints, $bitmask) = caller($i);
Here $subroutine may be
if the frame is not a subroutine
call, but an
eval. In such a case additional elements $evaltext and
is true if the frame is created by a
use statement, $evaltext contains the text of the
statement. In particular, for an
, but $evaltext is undefined. (Note also that
use statement creates a
require frame inside an
frame.) $subroutine may also be
if this particular
subroutine happens to have been deleted from the symbol table.
is true if a new instance of
was set up for the frame.
contain pragmatic hints that the caller was
compiled with. The
values are subject to change
between versions of Perl, and are not meant for external use.
Furthermore, when called from within the DB package, caller returns more
detailed information: it sets the list variable
to be the
arguments with which the subroutine was invoked.
Be aware that the optimizer might have optimized call frames away before
caller had a chance to get the information. That means that
might not return information about the call frame you expect it do, for
N > 1
. In particular,
might have information from the
caller was called.