11 tie my $c => 'Tie::Monitor';
13 sub expected_tie_calls {
14 my ($obj, $rexp, $wexp, $tn) = @_;
15 local $::Level = $::Level + 1;
16 my ($rgot, $wgot) = $obj->init();
17 is ($rgot, $rexp, $tn ? "number of fetches when $tn" : ());
18 is ($wgot, $wexp, $tn ? "number of stores when $tn" : ());
21 # Use ok() instead of is(), cmp_ok() etc, to strictly control number of accesses
23 ok($r = $c + 0 == 0, 'the thing itself');
24 expected_tie_calls(tied $c, 1, 0);
25 ok($r = "$c" eq '0', 'the thing itself');
26 expected_tie_calls(tied $c, 1, 0);
28 ok($c . 'x' eq '0x', 'concat');
29 expected_tie_calls(tied $c, 1, 0);
30 ok('x' . $c eq 'x0', 'concat');
31 expected_tie_calls(tied $c, 1, 0);
33 ok($s eq '00', 'concat');
34 expected_tie_calls(tied $c, 2, 0);
37 ok($s eq 'xy', 'concat');
38 expected_tie_calls(tied $c, 1, 1);
40 ok($s eq '0x', 'concat');
41 expected_tie_calls(tied $c, 2, 1);
43 ok($s eq 'x0', 'concat');
44 expected_tie_calls(tied $c, 2, 1);
46 ok($s eq '00', 'concat');
47 expected_tie_calls(tied $c, 3, 1);
50 ok($s eq '0', 'multiple magic in core functions');
51 expected_tie_calls(tied $c, 1, 1);
56 'Assignment should not ignore magic when the last thing assigned was a glob');
57 expected_tie_calls(tied $c, 1, 1);
59 package o { use overload '""' => sub { "foo\n" } }
62 expected_tie_calls(tied $c, 1, 2, 'chomping a ref');
65 my $outfile = tempfile();
66 open my $h, ">$outfile" or die "$0 cannot close $outfile: $!";
69 close $h or die "$0 cannot close $outfile: $!";
74 sysread $h, $c, 3, 7; # 1 read; 1 write
75 is $c, "*main::bar", 'what sysread wrote'; # 1 read
76 expected_tie_calls(tied $c, 2, 2, 'calling sysread with tied buf');
77 close $h or die "$0 cannot close $outfile: $!";
79 # Do this again, with a utf8 handle
81 open $h, "<:utf8", $outfile;
82 no warnings 'deprecated';
83 sysread $h, $c, 3, 7; # 1 read; 1 write
84 is $c, "*main::bar", 'what sysread wrote'; # 1 read
85 expected_tie_calls(tied $c, 2, 2, 'calling sysread with tied buf');
86 close $h or die "$0 cannot close $outfile: $!";
91 # autovivication of aelem, helem, of rv2sv combined with get-magic
95 tie $$s, "Tie::Monitor";
99 expected_tie_calls(tied $$s, 3, 2);
102 tie $a[0], "Tie::Monitor";
106 expected_tie_calls(tied $a[0], 3, 2);
109 tie $h{foo}, "Tie::Monitor";
112 is($h{foo}{bar}, 73);
113 expected_tie_calls(tied $h{foo}, 3, 2);
115 # Similar tests, but with obscured autovivication by using dummy list or "?:" operator
117 ${ (), $$s }[0] = 73;
119 expected_tie_calls(tied $$s, 3, 2);
122 ( ! $true ? undef : $$s )->[0] = 73;
124 expected_tie_calls(tied $$s, 3, 2);
127 ( $true ? $$s : undef )->[0] = 73;
129 expected_tie_calls(tied $$s, 3, 2);
132 # A plain *foo should not call get-magic on *foo.
133 # This method of scalar-tying an immutable glob relies on details of the
134 # current implementation that are subject to change. This test may need to
135 # be rewritten if they do change.
136 my $tyre = tie $::{gelp} => 'Tie::Monitor';
137 # Compilation of this eval autovivifies the *gelp glob.
138 eval '$tyre->init(0); () = \*gelp';
139 my($rgot, $wgot) = $tyre->init(0);
140 ok($rgot == 0, 'a plain *foo causes no get-magic');
141 ok($wgot == 0, 'a plain *foo causes no set-magic');
143 # get-magic when exiting a non-lvalue sub in potentially autovivify-
148 my $tied_to = tie $_{elem}, "Tie::Monitor";
149 () = sub { delete $_{elem} }->()->[3];
150 expected_tie_calls $tied_to, 1, 0,
151 'mortal magic var is implicitly returned in autoviv context';
153 $tied_to = tie $_{elem}, "Tie::Monitor";
154 () = sub { return delete $_{elem} }->()->[3];
155 expected_tie_calls $tied_to, 1, 0,
156 'mortal magic var is explicitly returned in autoviv context';
158 $tied_to = tie $_{elem}, "Tie::Monitor";
160 $rsub = sub { if ($_[0]) { delete $_{elem} } else { &$rsub(1)->[3] } };
162 expected_tie_calls $tied_to, 1, 0,
163 'mortal magic var is implicitly returned in recursive autoviv context';
165 $tied_to = tie $_{elem}, "Tie::Monitor";
167 if ($_[0]) { return delete $_{elem} } else { &$rsub(1)->[3] }
170 expected_tie_calls $tied_to, 1, 0,
171 'mortal magic var is explicitly returned in recursive autoviv context';
173 $tied_to = tie $_{elem}, "Tie::Monitor";
174 my $x = \sub { delete $_{elem} }->();
175 expected_tie_calls $tied_to, 1, 0,
176 'mortal magic var is implicitly returned to refgen';
178 'mortal magic var is copied when implicitly returned';
180 $tied_to = tie $_{elem}, "Tie::Monitor";
181 $x = \sub { return delete $_{elem} }->();
182 expected_tie_calls $tied_to, 1, 0,
183 'mortal magic var is explicitly returned to refgen';
185 'mortal magic var is copied when explicitly returned';
187 $tied_to = tie $_{elem}, "Tie::Monitor";
188 $x = \do { 1; delete $_{elem} };
189 expected_tie_calls $tied_to, 1, 0,
190 'mortal magic var from do passed to refgen';
192 'mortal magic var from do is copied';
197 # adapted from Tie::Counter by Abigail
198 package Tie::Monitor;
201 my($class, $value) = @_;
212 $self->{values}[$#{ $self->{values} }];
216 my($self, $value) = @_;
218 push @{ $self->{values} }, $value;
223 my @results = ($self->{read}, $self->{write});
224 $self->{read} = $self->{write} = 0;
225 $self->{values} = [ 0 ];