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pp.c: Remove useless read-only check from S_do_chomp
[perl5.git] / t / op / gmagic.t
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1#!./perl -w
2
3BEGIN {
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4 chdir 't' if -d 't';
5 @INC = '../lib';
ead3e279 6 require './test.pl';
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7}
8
ead3e279 9use strict;
8d6d96c1 10
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11tie my $c => 'Tie::Monitor';
12
ead3e279 13sub expected_tie_calls {
40914f83 14 my ($obj, $rexp, $wexp, $tn) = @_;
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15 local $::Level = $::Level + 1;
16 my ($rgot, $wgot) = $obj->init();
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17 is ($rgot, $rexp, $tn ? "number of fetches when $tn" : ());
18 is ($wgot, $wexp, $tn ? "number of stores when $tn" : ());
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19}
20
ead3e279 21# Use ok() instead of is(), cmp_ok() etc, to strictly control number of accesses
8d6d96c1 22my($r, $s);
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23ok($r = $c + 0 == 0, 'the thing itself');
24expected_tie_calls(tied $c, 1, 0);
25ok($r = "$c" eq '0', 'the thing itself');
26expected_tie_calls(tied $c, 1, 0);
27
28ok($c . 'x' eq '0x', 'concat');
29expected_tie_calls(tied $c, 1, 0);
30ok('x' . $c eq 'x0', 'concat');
31expected_tie_calls(tied $c, 1, 0);
8d6d96c1 32$s = $c . $c;
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33ok($s eq '00', 'concat');
34expected_tie_calls(tied $c, 2, 0);
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35$r = 'x';
36$s = $c = $r . 'y';
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37ok($s eq 'xy', 'concat');
38expected_tie_calls(tied $c, 1, 1);
8d6d96c1 39$s = $c = $c . 'x';
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40ok($s eq '0x', 'concat');
41expected_tie_calls(tied $c, 2, 1);
8d6d96c1 42$s = $c = 'x' . $c;
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43ok($s eq 'x0', 'concat');
44expected_tie_calls(tied $c, 2, 1);
8d6d96c1 45$s = $c = $c . $c;
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46ok($s eq '00', 'concat');
47expected_tie_calls(tied $c, 3, 1);
8d6d96c1 48
1e968d83 49$s = chop($c);
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50ok($s eq '0', 'multiple magic in core functions');
51expected_tie_calls(tied $c, 1, 1);
1e968d83 52
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53$c = *strat;
54$s = $c;
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55ok($s eq *strat,
56 'Assignment should not ignore magic when the last thing assigned was a glob');
074ededa 57expected_tie_calls(tied $c, 1, 1);
5cf4b255 58
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59# autovivication of aelem, helem, of rv2sv combined with get-magic
60{
61 my $true = 1;
62 my $s;
63 tie $$s, "Tie::Monitor";
64 $$s = undef;
65 $$s->[0] = 73;
66 is($$s->[0], 73);
67 expected_tie_calls(tied $$s, 2, 2);
68
69 my @a;
70 tie $a[0], "Tie::Monitor";
71 $a[0] = undef;
72 $a[0][0] = 73;
73 is($a[0][0], 73);
74 expected_tie_calls(tied $a[0], 2, 2);
75
76 my %h;
77 tie $h{foo}, "Tie::Monitor";
78 $h{foo} = undef;
79 $h{foo}{bar} = 73;
80 is($h{foo}{bar}, 73);
81 expected_tie_calls(tied $h{foo}, 2, 2);
82
83 # Similar tests, but with obscured autovivication by using dummy list or "?:" operator
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84 $$s = undef;
85 ${ (), $$s }[0] = 73;
86 is( $$s->[0], 73);
87 expected_tie_calls(tied $$s, 2, 2);
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88
89 $$s = undef;
90 ( ! $true ? undef : $$s )->[0] = 73;
91 is( $$s->[0], 73);
92 expected_tie_calls(tied $$s, 2, 2);
93
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94 $$s = undef;
95 ( $true ? $$s : undef )->[0] = 73;
96 is( $$s->[0], 73);
97 expected_tie_calls(tied $$s, 2, 2);
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98}
99
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100# A plain *foo should not call get-magic on *foo.
101# This method of scalar-tying an immutable glob relies on details of the
102# current implementation that are subject to change. This test may need to
103# be rewritten if they do change.
104my $tyre = tie $::{gelp} => 'Tie::Monitor';
105# Compilation of this eval autovivifies the *gelp glob.
106eval '$tyre->init(0); () = \*gelp';
107my($rgot, $wgot) = $tyre->init(0);
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108ok($rgot == 0, 'a plain *foo causes no get-magic');
109ok($wgot == 0, 'a plain *foo causes no set-magic');
f64c9ac5 110
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111# get-magic when exiting a non-lvalue sub in potentially autovivify-
112# ing context
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113{
114 no strict;
115
116 my $tied_to = tie $_{elem}, "Tie::Monitor";
117 () = sub { delete $_{elem} }->()->[3];
118 expected_tie_calls $tied_to, 1, 0,
119 'mortal magic var is implicitly returned in autoviv context';
120
121 $tied_to = tie $_{elem}, "Tie::Monitor";
122 () = sub { return delete $_{elem} }->()->[3];
123 expected_tie_calls $tied_to, 1, 0,
124 'mortal magic var is explicitly returned in autoviv context';
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125
126 $tied_to = tie $_{elem}, "Tie::Monitor";
127 my $rsub;
128 $rsub = sub { if ($_[0]) { delete $_{elem} } else { &$rsub(1)->[3] } };
129 &$rsub;
130 expected_tie_calls $tied_to, 1, 0,
49b82a38 131 'mortal magic var is implicitly returned in recursive autoviv context';
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132
133 $tied_to = tie $_{elem}, "Tie::Monitor";
134 $rsub = sub {
135 if ($_[0]) { return delete $_{elem} } else { &$rsub(1)->[3] }
136 };
137 &$rsub;
138 expected_tie_calls $tied_to, 1, 0,
49b82a38 139 'mortal magic var is explicitly returned in recursive autoviv context';
40914f83 140}
767eda44 141
ead3e279 142done_testing();
5cf4b255 143
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144# adapted from Tie::Counter by Abigail
145package Tie::Monitor;
146
147sub TIESCALAR {
148 my($class, $value) = @_;
149 bless {
150 read => 0,
151 write => 0,
152 values => [ 0 ],
153 };
154}
155
156sub FETCH {
157 my $self = shift;
158 ++$self->{read};
159 $self->{values}[$#{ $self->{values} }];
160}
161
162sub STORE {
163 my($self, $value) = @_;
164 ++$self->{write};
165 push @{ $self->{values} }, $value;
166}
167
168sub init {
169 my $self = shift;
170 my @results = ($self->{read}, $self->{write});
171 $self->{read} = $self->{write} = 0;
172 $self->{values} = [ 0 ];
173 @results;
174}