mingw/lib/ops.pm

   1 package ops;
   2
   3 our $VERSION = '1.01';
   4
   5 use Opcode qw(opmask_add opset invert_opset);
   6
   7 sub import {
   8     shift;
   9     # Not that unimport is the preferred 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