Commit | Line | Data |
---|---|---|
a687059c LW |
1 | #!./perl |
2 | ||
e03bd546 JH |
3 | BEGIN { |
4 | chdir 't' if -d 't'; | |
20822f61 | 5 | @INC = '../lib'; |
48f8bad9 | 6 | require './test.pl'; |
e03bd546 JH |
7 | } |
8 | ||
48f8bad9 | 9 | use strict; |
a687059c | 10 | |
48f8bad9 NC |
11 | use vars qw(@ary %ary %hash); |
12 | ||
4dda930b | 13 | plan 74; |
48f8bad9 NC |
14 | |
15 | ok !defined($a); | |
a687059c LW |
16 | |
17 | $a = 1+1; | |
48f8bad9 | 18 | ok defined($a); |
a687059c LW |
19 | |
20 | undef $a; | |
48f8bad9 | 21 | ok !defined($a); |
a687059c LW |
22 | |
23 | $a = "hi"; | |
48f8bad9 | 24 | ok defined($a); |
a687059c LW |
25 | |
26 | $a = $b; | |
48f8bad9 | 27 | ok !defined($a); |
a687059c LW |
28 | |
29 | @ary = ("1arg"); | |
30 | $a = pop(@ary); | |
48f8bad9 | 31 | ok defined($a); |
a687059c | 32 | $a = pop(@ary); |
48f8bad9 | 33 | ok !defined($a); |
a687059c LW |
34 | |
35 | @ary = ("1arg"); | |
36 | $a = shift(@ary); | |
48f8bad9 | 37 | ok defined($a); |
a687059c | 38 | $a = shift(@ary); |
48f8bad9 | 39 | ok !defined($a); |
a687059c LW |
40 | |
41 | $ary{'foo'} = 'hi'; | |
48f8bad9 NC |
42 | ok defined($ary{'foo'}); |
43 | ok !defined($ary{'bar'}); | |
a687059c | 44 | undef $ary{'foo'}; |
48f8bad9 | 45 | ok !defined($ary{'foo'}); |
a687059c | 46 | |
48f8bad9 | 47 | sub foo { pass; 1 } |
a687059c | 48 | |
48f8bad9 | 49 | &foo || fail; |
a687059c | 50 | |
48f8bad9 | 51 | ok defined &foo; |
a687059c | 52 | undef &foo; |
48f8bad9 | 53 | ok !defined(&foo); |
a3f914c5 GS |
54 | |
55 | eval { undef $1 }; | |
48f8bad9 | 56 | like $@, qr/^Modification of a read/; |
a3f914c5 GS |
57 | |
58 | eval { $1 = undef }; | |
48f8bad9 | 59 | like $@, qr/^Modification of a read/; |
a3f914c5 | 60 | |
659eaf73 | 61 | { |
3d387947 JH |
62 | # [perl #17753] segfault when undef'ing unquoted string constant |
63 | eval 'undef tcp'; | |
48f8bad9 | 64 | like $@, qr/^Can't modify constant item/; |
3d387947 | 65 | } |
2f86008e DM |
66 | |
67 | # bugid 3096 | |
68 | # undefing a hash may free objects with destructors that then try to | |
3b37eb24 DM |
69 | # modify the hash. Ensure that the hash remains consistent |
70 | ||
71 | { | |
72 | my (%hash, %mirror); | |
73 | ||
74 | my $iters = 5; | |
75 | ||
76 | for (1..$iters) { | |
77 | $hash{"k$_"} = bless ["k$_"], 'X'; | |
78 | $mirror{"k$_"} = "k$_"; | |
79 | } | |
80 | ||
81 | ||
82 | my $c = $iters; | |
83 | my $events; | |
84 | ||
85 | sub X::DESTROY { | |
86 | my $key = $_[0][0]; | |
87 | $events .= 'D'; | |
88 | note("----- DELETE($key) ------"); | |
89 | delete $mirror{$key}; | |
90 | ||
91 | is join('-', sort keys %hash), join('-', sort keys %mirror), | |
92 | "$key: keys"; | |
93 | is join('-', sort map $_->[0], values %hash), | |
94 | join('-', sort values %mirror), "$key: values"; | |
95 | ||
96 | # don't know exactly what we'll get from the iterator, but | |
97 | # it must be a sensible value | |
98 | my ($k, $v) = each %hash; | |
99 | ok defined $k ? exists($mirror{$k}) : (keys(%mirror) == 0), | |
100 | "$key: each 1"; | |
101 | ||
102 | is delete $hash{$key}, undef, "$key: delete"; | |
103 | ($k, $v) = each %hash; | |
104 | ok defined $k ? exists($mirror{$k}) : (keys(%mirror) <= 1), | |
105 | "$key: each 2"; | |
106 | ||
107 | $c++; | |
108 | if ($c <= $iters * 2) { | |
109 | $hash{"k$c"} = bless ["k$c"], 'X'; | |
110 | $mirror{"k$c"} = "k$c"; | |
111 | } | |
112 | $events .= 'E'; | |
113 | } | |
114 | ||
115 | each %hash; # set eiter | |
116 | undef %hash; | |
117 | ||
118 | is scalar keys %hash, 0, "hash empty at end"; | |
119 | is $events, ('DE' x ($iters*2)), "events"; | |
120 | my ($k, $v) = each %hash; | |
121 | is $k, undef, 'each undef at end'; | |
2f86008e | 122 | } |
6e592b3a | 123 | |
d054cdb0 FC |
124 | # part of #105906: inlined undef constant getting copied |
125 | BEGIN { $::{z} = \undef } | |
126 | for (z,z) { | |
127 | push @_, \$_; | |
128 | } | |
129 | is $_[0], $_[1], 'undef constants preserve identity'; | |
130 | ||
4dda930b FC |
131 | # [perl #122556] |
132 | my $messages; | |
133 | package Thingie; | |
134 | DESTROY { $messages .= 'destroyed ' } | |
135 | package main; | |
136 | sub body { | |
137 | sub { | |
138 | my $t = bless [], 'Thingie'; | |
139 | undef $t; | |
140 | }->(), $messages .= 'after '; | |
141 | ||
142 | return; | |
143 | } | |
144 | body(); | |
145 | is $messages, 'destroyed after ', 'undef $scalar frees refs immediately'; | |
146 | ||
147 | ||
6e592b3a BM |
148 | # this will segfault if it fails |
149 | ||
150 | sub PVBM () { 'foo' } | |
151 | { my $dummy = index 'foo', PVBM } | |
152 | ||
153 | my $pvbm = PVBM; | |
154 | undef $pvbm; | |
48f8bad9 | 155 | ok !defined $pvbm; |