| 1 | package ops; |
| 2 | |
| 3 | our $VERSION = '1.00'; |
| 4 | |
| 5 | use Opcode qw(opmask_add opset invert_opset); |
| 6 | |
| 7 | sub import { |
| 8 | shift; |
| 9 | # Not that unimport is the prefered form since import's don't |
| 10 | # accumulate well owing to the 'only ever add opmask' rule. |
| 11 | # E.g., perl -Mops=:set1 -Mops=:setb is unlikely to do as expected. |
| 12 | opmask_add(invert_opset opset(@_)) if @_; |
| 13 | } |
| 14 | |
| 15 | sub unimport { |
| 16 | shift; |
| 17 | opmask_add(opset(@_)) if @_; |
| 18 | } |
| 19 | |
| 20 | 1; |
| 21 | |
| 22 | __END__ |
| 23 | |
| 24 | =head1 NAME |
| 25 | |
| 26 | ops - Perl pragma to restrict unsafe operations when compiling |
| 27 | |
| 28 | =head1 SYNOPSIS |
| 29 | |
| 30 | perl -Mops=:default ... # only allow reasonably safe operations |
| 31 | |
| 32 | perl -M-ops=system ... # disable the 'system' opcode |
| 33 | |
| 34 | =head1 DESCRIPTION |
| 35 | |
| 36 | Since the ops pragma currently has an irreversible global effect, it is |
| 37 | only of significant practical use with the C<-M> option on the command line. |
| 38 | |
| 39 | See the L<Opcode> module for information about opcodes, optags, opmasks |
| 40 | and important information about safety. |
| 41 | |
| 42 | =head1 SEE ALSO |
| 43 | |
| 44 | Opcode(3), Safe(3), perlrun(3) |
| 45 | |
| 46 | =cut |
| 47 | |