C<use autodie> unravels C<use strict>
------- =_aaaaaaaaaa0
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
Content-Description: a letter from tchrist
Content-ID: <10727.1298817978.1@chthon>
Everything I touch today crumbles in my hands.
When you use autodie, you implicitly declare legal
any scalar variable whose name matches that of any
function it "fatalizes".
Here's a (partial) dump of %main:: during the compilation
and run of the enclosed program:
BEFORE AUTODIE => $0 @ARGV %ENV @INC %INC @_ &dump_main &func1 &funcU
AFTER AUTODIE => $0 @ARGV %DOES %ENV @INC %INC %SIG @_ &accept &bind &binmode &carp &chdir &close &closedir &confess &connect &croak &dbmclose &dbmopen &dump_main &fcntl &fileno &flock &fork &func1 &funcU &getsockopt &ioctl &link &listen &mkdir &msgctl &msgget &msgrcv &msgsnd &open &opendir &pipe &read &readlink &recv &rename &rmdir &seek &semctl &semget &semop &send &setsockopt &shmctl &shmget &shmread &shutdown &socketpair &symlink &sysopen &sysread &sysseek &syswrite &truncate &umask &unlink
DONE COMPILING => $0 @ARGV %DOES %ENV @INC %INC %SIG @_ &carp &confess &croak &dump_main &func1 &funcU
BEGIN PROGRAM => $0 @ARGV %DOES %ENV @INC %INC %SIG @_ &carp &confess &croak &dump_main &func1 &funcU
END PROGRAM => $0 @ARGV %DOES %ENV @INC %INC %SIG @_ &carp &confess &croak &dump_main $fork &func1 $func1 &funcU $funcU $open $pipe $read $recv $seek $send
Blech!
Tested under v5.12.3, v5.13.9, and v5.13.10-33-g149d510.
--tom
------- =_aaaaaaaaaa0
Content-Type: text/plain; charset="us-ascii"; name="broken-autodie"; filename="broken-autodie"
Content-Disposition: inline
Content-Description: the broken-autodie demo program
Content-ID: <10727.1298817978.2@chthon>
use strict;
use warnings;
use feature "say";
sub func1 { return 1 }
sub funcU { return undef }
sub dump_main($) {
my $arg = shift();
print "\U$arg\t=> ";
for my $symbol (sort grep { /^\w+$/ } keys %main::) {
local *GLOB = $main::{$symbol};
print '&', $symbol, " " if *GLOB{CODE};
print '$', $symbol, " " if *GLOB{SCALAR} && defined ${ *GLOB{SCALAR} };
print '@', $symbol, " " if *GLOB{ARRAY};
print '%', $symbol, " " if *GLOB{HASH};
}
print "\n";
}
END { dump_main("end program") }
CHECK { dump_main("done compiling") }
INIT { dump_main("begin program") }
BEGIN { dump_main("before autodie") }
use autodie qw[ :default func1 funcU ];
BEGIN { dump_main("after autodie") }
# C<use autodie> makes all these package globals legal under use strict!!
$fork = 1;
$open = 1;
$pipe = 1;
$read = 1;
$recv = 1;
$seek = 1;
$send = 1;
$func1 = 1;
$funcU = 1;
------- =_aaaaaaaaaa0--
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tchrist
2/27/2011 2:48:55 PM
perl.perl5.porters
48287 articles. 
1 followers.
2 Replies
987 Views
Bug #2: *I* never imported Carp into main::,
so why am I being polluted by autodie??
--tom
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tchrist
2/27/2011 2:51:36 PM
On 02/28/2011 01:48 AM, Tom Christiansen wrote: > When you use autodie, you implicitly declare legal > any scalar variable whose name matches that of any > function it "fatalizes". > Bug #2: *I* never imported Carp into main::, > so why am I being polluted by autodie?? Gah, stuck in the middle of the World's Longest Company Tax Return, but neither of those are intended behaviour. The Carp pollution is fixed in autodie 2.10 which is on the CPAN. A quick test reveals that the legalising of variable names seems to still be around. My guess is that the Fatal::_install_subs() subroutine is to blame, but I'll need to do some testing to find out for sure. Many thanks for the report! Paul -- Paul Fenwick <pjf@perltraining.com.au> | http://perltraining.com.au/ Director of Training | Ph: +61 3 9354 6001 Perl Training Australia | Fax: +61 3 9354 2681
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pjf
2/28/2011 5:35:08 AM
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Just to note that RFC 76 (Builtin: reduce) also proposes this mechanism as a means of short-circuiting C<reduce>. Damian ...
Use of <code>, <var>, <kbd>, and <samp>
Is there any policy as to whether <code>, <var>, <kbd> and <samp> can all be used, and if so, whether they should only be used for XUL, etc. or other code documented at the site, or whether they can also be used to refer to code which is not intended as the subject of any documentation, but which is used as an example. For example, the template tutorial indicates that <content>'s @uri attribute can be set to any variable name, such as "?start" or "?uri". Could these be referenced with <var> too, or is it the policy to co...
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it will be usefull to have a good Vb C# | C# Vb translatorangiras I'll ask around and see if I can find out if we're planning to offer translation. In the meantime, you can find a number of them on the web, and you can also look into the DTE (our automation model) Code Model - you may be able to use it to do some interesting forms of translation. -ScottThis posting is provided "AS IS" with no warranties, and confers no rights. I have never heard about this code model ! thanksangiras they say Namespace: EnvDTE I cannot find it is it Microsofz.Win32 ?angiras The EnvDTE DL...
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