tie my $c => 'Tie::Monitor';
sub expected_tie_calls {
- my ($obj, $rexp, $wexp) = @_;
+ my ($obj, $rexp, $wexp, $tn) = @_;
local $::Level = $::Level + 1;
my ($rgot, $wgot) = $obj->init();
- is ($rgot, $rexp);
- is ($wgot, $wexp);
+ is ($rgot, $rexp, $tn ? "number of fetches when $tn" : ());
+ is ($wgot, $wexp, $tn ? "number of stores when $tn" : ());
}
# Use ok() instead of is(), cmp_ok() etc, to strictly control number of accesses
ok($s eq '0', 'multiple magic in core functions');
expected_tie_calls(tied $c, 1, 1);
-# was a glob
-my $tied_to = tied $c;
$c = *strat;
$s = $c;
ok($s eq *strat,
'Assignment should not ignore magic when the last thing assigned was a glob');
-expected_tie_calls($tied_to, 1, 1);
+expected_tie_calls(tied $c, 1, 1);
+
+package o { use overload '""' => sub { "foo\n" } }
+$c = bless [], o::;
+chomp $c;
+expected_tie_calls(tied $c, 1, 2, 'chomping a ref');
+
+{
+ my $outfile = tempfile();
+ open my $h, ">$outfile" or die "$0 cannot close $outfile: $!";
+ print $h "bar\n";
+ close $h or die "$0 cannot close $outfile: $!";
+
+ $c = *foo; # 1 write
+ open $h, $outfile;
+ sysread $h, $c, 3, 7; # 1 read; 1 write
+ is $c, "*main::bar", 'what sysread wrote'; # 1 read
+ expected_tie_calls(tied $c, 2, 2, 'calling sysread with tied buf');
+ close $h or die "$0 cannot close $outfile: $!";
+
+ # Do this again, with a utf8 handle
+ $c = *foo; # 1 write
+ open $h, "<:utf8", $outfile;
+ sysread $h, $c, 3, 7; # 1 read; 1 write
+ is $c, "*main::bar", 'what sysread wrote'; # 1 read
+ expected_tie_calls(tied $c, 2, 2, 'calling sysread with tied buf');
+ close $h or die "$0 cannot close $outfile: $!";
+
+ unlink_all $outfile;
+}
+
+# autovivication of aelem, helem, of rv2sv combined with get-magic
+{
+ my $true = 1;
+ my $s;
+ tie $$s, "Tie::Monitor";
+ $$s = undef;
+ $$s->[0] = 73;
+ is($$s->[0], 73);
+ expected_tie_calls(tied $$s, 3, 2);
+
+ my @a;
+ tie $a[0], "Tie::Monitor";
+ $a[0] = undef;
+ $a[0][0] = 73;
+ is($a[0][0], 73);
+ expected_tie_calls(tied $a[0], 3, 2);
+
+ my %h;
+ tie $h{foo}, "Tie::Monitor";
+ $h{foo} = undef;
+ $h{foo}{bar} = 73;
+ is($h{foo}{bar}, 73);
+ expected_tie_calls(tied $h{foo}, 3, 2);
+
+ # Similar tests, but with obscured autovivication by using dummy list or "?:" operator
+ $$s = undef;
+ ${ (), $$s }[0] = 73;
+ is( $$s->[0], 73);
+ expected_tie_calls(tied $$s, 3, 2);
+
+ $$s = undef;
+ ( ! $true ? undef : $$s )->[0] = 73;
+ is( $$s->[0], 73);
+ expected_tie_calls(tied $$s, 3, 2);
+
+ $$s = undef;
+ ( $true ? $$s : undef )->[0] = 73;
+ is( $$s->[0], 73);
+ expected_tie_calls(tied $$s, 3, 2);
+}
# A plain *foo should not call get-magic on *foo.
# This method of scalar-tying an immutable glob relies on details of the
# get-magic when exiting a non-lvalue sub in potentially autovivify-
# ing context
-$tied_to = tie $_{elem}, "Tie::Monitor";
-eval { () = sub { delete $_{elem} }->()->[3] };
-ok +($tied_to->init)[0],
- 'get-magic is called on mortal magic var on sub exit in autoviv context';
-$tied_to = tie $_{elem}, "Tie::Monitor";
-eval { () = sub { return delete $_{elem} }->()->[3] };
-ok +($tied_to->init)[0],
- 'get-magic is called on mortal magic var on return in autoviv context';
+{
+ no strict;
+
+ my $tied_to = tie $_{elem}, "Tie::Monitor";
+ () = sub { delete $_{elem} }->()->[3];
+ expected_tie_calls $tied_to, 1, 0,
+ 'mortal magic var is implicitly returned in autoviv context';
+
+ $tied_to = tie $_{elem}, "Tie::Monitor";
+ () = sub { return delete $_{elem} }->()->[3];
+ expected_tie_calls $tied_to, 1, 0,
+ 'mortal magic var is explicitly returned in autoviv context';
+
+ $tied_to = tie $_{elem}, "Tie::Monitor";
+ my $rsub;
+ $rsub = sub { if ($_[0]) { delete $_{elem} } else { &$rsub(1)->[3] } };
+ &$rsub;
+ expected_tie_calls $tied_to, 1, 0,
+ 'mortal magic var is implicitly returned in recursive autoviv context';
+
+ $tied_to = tie $_{elem}, "Tie::Monitor";
+ $rsub = sub {
+ if ($_[0]) { return delete $_{elem} } else { &$rsub(1)->[3] }
+ };
+ &$rsub;
+ expected_tie_calls $tied_to, 1, 0,
+ 'mortal magic var is explicitly returned in recursive autoviv context';
+
+ $tied_to = tie $_{elem}, "Tie::Monitor";
+ my $x = \sub { delete $_{elem} }->();
+ expected_tie_calls $tied_to, 1, 0,
+ 'mortal magic var is implicitly returned to refgen';
+ is tied $$x, undef,
+ 'mortal magic var is copied when implicitly returned';
+
+ $tied_to = tie $_{elem}, "Tie::Monitor";
+ $x = \sub { return delete $_{elem} }->();
+ expected_tie_calls $tied_to, 1, 0,
+ 'mortal magic var is explicitly returned to refgen';
+ is tied $$x, undef,
+ 'mortal magic var is copied when explicitly returned';
+}
done_testing();