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Inconsistencies in paramter const-ness noticed by SADAHIRO Tomoyuki.
[perl5.git] / t / op / caller.t
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1#!./perl
2# Tests for caller()
3
4BEGIN {
5 chdir 't' if -d 't';
6 @INC = '../lib';
7 require './test.pl';
71860c90 8 plan( tests => 56 );
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9}
10
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11my @c;
12
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13print "# Tests with caller(0)\n";
14
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15@c = caller(0);
16ok( (!@c), "caller(0) in main program" );
17
18eval { @c = caller(0) };
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19is( $c[3], "(eval)", "subroutine name in an eval {}" );
20ok( !$c[4], "hasargs false in an eval {}" );
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21
22eval q{ @c = (Caller(0))[3] };
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23is( $c[3], "(eval)", "subroutine name in an eval ''" );
24ok( !$c[4], "hasargs false in an eval ''" );
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25
26sub { @c = caller(0) } -> ();
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27is( $c[3], "main::__ANON__", "anonymous subroutine name" );
28ok( $c[4], "hasargs true with anon sub" );
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29
30# Bug 20020517.003, used to dump core
31sub foo { @c = caller(0) }
32my $fooref = delete $::{foo};
33$fooref -> ();
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34is( $c[3], "(unknown)", "unknown subroutine name" );
35ok( $c[4], "hasargs true with unknown sub" );
36
37print "# Tests with caller(1)\n";
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38
39sub f { @c = caller(1) }
40
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41sub callf { f(); }
42callf();
43is( $c[3], "main::callf", "subroutine name" );
44ok( $c[4], "hasargs true with callf()" );
45&callf;
46ok( !$c[4], "hasargs false with &callf" );
47
07b8c804 48eval { f() };
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49is( $c[3], "(eval)", "subroutine name in an eval {}" );
50ok( !$c[4], "hasargs false in an eval {}" );
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51
52eval q{ f() };
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53is( $c[3], "(eval)", "subroutine name in an eval ''" );
54ok( !$c[4], "hasargs false in an eval ''" );
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55
56sub { f() } -> ();
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57is( $c[3], "main::__ANON__", "anonymous subroutine name" );
58ok( $c[4], "hasargs true with anon sub" );
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59
60sub foo2 { f() }
61my $fooref2 = delete $::{foo2};
62$fooref2 -> ();
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63is( $c[3], "(unknown)", "unknown subroutine name" );
64ok( $c[4], "hasargs true with unknown sub" );
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65
66# See if caller() returns the correct warning mask
67
68sub testwarn {
69 my $w = shift;
2db3864f 70 is( (caller(0))[9], $w, "warnings match caller");
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71}
72
73# NB : extend the warning mask values below when new warnings are added
74{
75 no warnings;
2db3864f 76 BEGIN { is( ${^WARNING_BITS}, "\0" x 12, 'all bits off via "no warnings"' ) }
75b6c4ca 77 testwarn("\0" x 12);
2db3864f 78
75b6c4ca 79 use warnings;
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80 BEGIN { is( ${^WARNING_BITS}, "UUUUUUUUUUU\025", 'default bits on via "use warnings"' ); }
81 BEGIN { testwarn("UUUUUUUUUUU\025", "#1"); }
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82 # run-time :
83 # the warning mask has been extended by warnings::register
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84 testwarn("UUUUUUUUUUUU");
85
75b6c4ca 86 use warnings::register;
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87 BEGIN { is( ${^WARNING_BITS}, "UUUUUUUUUUUU", 'warning bits on via "use warnings::register"' ) }
88 testwarn("UUUUUUUUUUUU","#3");
75b6c4ca 89}
f2a7f298 90
91
92# The next two cases test for a bug where caller ignored evals if
93# the DB::sub glob existed but &DB::sub did not (for example, if
94# $^P had been set but no debugger has been loaded). The tests
95# thus assume that there is no &DB::sub: if there is one, they
96# should both pass no matter whether or not this bug has been
97# fixed.
98
99my $debugger_test = q<
100 my @stackinfo = caller(0);
101 return scalar @stackinfo;
102>;
103
104sub pb { return (caller(0))[3] }
105
106my $i = eval $debugger_test;
b3ca2e83 107is( $i, 11, "do not skip over eval (and caller returns 10 elements)" );
f2a7f298 108
109is( eval 'pb()', 'main::pb', "actually return the right function name" );
110
111my $saved_perldb = $^P;
112$^P = 16;
113$^P = $saved_perldb;
114
115$i = eval $debugger_test;
b3ca2e83 116is( $i, 11, 'do not skip over eval even if $^P had been on at some point' );
f2a7f298 117is( eval 'pb()', 'main::pb', 'actually return the right function name even if $^P had been on at some point' );
118
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119print "# caller can now return the compile time state of %^H\n";
120
121sub get_hash {
122 my $level = shift;
123 my @results = caller($level||0);
124 $results[10];
125}
126
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127sub get_dooot {
128 my $level = shift;
129 my @results = caller($level||0);
130 $results[10]->{dooot};
131}
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132
133sub get_thikoosh {
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134 my $level = shift;
135 my @results = caller($level||0);
71860c90 136 $results[10]->{thikoosh};
b3ca2e83 137}
71860c90 138
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139sub dooot {
140 is(get_dooot(), undef);
71860c90 141 is(get_thikoosh(), undef);
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142 my $hash = get_hash();
143 ok(!exists $hash->{dooot});
71860c90 144 ok(!exists $hash->{thikoosh});
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145 is(get_dooot(1), 54);
146 BEGIN {
147 $^H{dooot} = 42;
148 }
149 is(get_dooot(), 6 * 7);
150 is(get_dooot(1), 54);
151
152 BEGIN {
153 $^H{dooot} = undef;
154 }
155 is(get_dooot(), undef);
156 $hash = get_hash();
157 ok(exists $hash->{dooot});
158
159 BEGIN {
160 delete $^H{dooot};
161 }
162 is(get_dooot(), undef);
163 $hash = get_hash();
164 ok(!exists $hash->{dooot});
165 is(get_dooot(1), 54);
166}
167{
168 is(get_dooot(), undef);
71860c90 169 is(get_thikoosh(), undef);
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170 BEGIN {
171 $^H{dooot} = 1;
71860c90 172 $^H{thikoosh} = "SKREECH";
b3ca2e83 173 }
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174 is(get_dooot(), 1);
175 is(get_thikoosh(), "SKREECH");
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176
177 BEGIN {
178 $^H{dooot} = 42;
179 }
180 {
181 {
182 BEGIN {
183 $^H{dooot} = 6 * 9;
184 }
185 is(get_dooot(), 54);
71860c90 186 is(get_thikoosh(), "SKREECH");
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187 {
188 BEGIN {
189 delete $^H{dooot};
190 }
191 is(get_dooot(), undef);
192 my $hash = get_hash();
193 ok(!exists $hash->{dooot});
71860c90 194 is(get_thikoosh(), "SKREECH");
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195 }
196 dooot();
197 }
198 is(get_dooot(), 6 * 7);
71860c90 199 is(get_thikoosh(), "SKREECH");
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200 }
201 is(get_dooot(), 6 * 7);
71860c90 202 is(get_thikoosh(), "SKREECH");
b3ca2e83 203}