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Fix eval 'q;;'
[perl5.git] / t / op / caller.t
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RGS
1#!./perl
2# Tests for caller()
3
4BEGIN {
5 chdir 't' if -d 't';
6 @INC = '../lib';
7 require './test.pl';
e7886211 8 plan( tests => 86 );
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9}
10
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11my @c;
12
b2ef6d44 13BEGIN { print "# Tests with caller(0)\n"; }
72699b0f 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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DM
34is( $c[3], "main::__ANON__", "deleted subroutine name" );
35ok( $c[4], "hasargs true with deleted sub" );
72699b0f 36
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FC
37BEGIN {
38 require strict;
39 is +(caller 0)[1], __FILE__,
40 "[perl #68712] filenames after require in a BEGIN block"
41}
42
72699b0f 43print "# Tests with caller(1)\n";
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44
45sub f { @c = caller(1) }
46
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47sub callf { f(); }
48callf();
49is( $c[3], "main::callf", "subroutine name" );
50ok( $c[4], "hasargs true with callf()" );
51&callf;
52ok( !$c[4], "hasargs false with &callf" );
53
07b8c804 54eval { f() };
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55is( $c[3], "(eval)", "subroutine name in an eval {}" );
56ok( !$c[4], "hasargs false in an eval {}" );
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57
58eval q{ f() };
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59is( $c[3], "(eval)", "subroutine name in an eval ''" );
60ok( !$c[4], "hasargs false in an eval ''" );
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61
62sub { f() } -> ();
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63is( $c[3], "main::__ANON__", "anonymous subroutine name" );
64ok( $c[4], "hasargs true with anon sub" );
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65
66sub foo2 { f() }
67my $fooref2 = delete $::{foo2};
68$fooref2 -> ();
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69is( $c[3], "main::__ANON__", "deleted subroutine name" );
70ok( $c[4], "hasargs true with deleted sub" );
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71
72# See if caller() returns the correct warning mask
73
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JH
74sub show_bits
75{
76 my $in = shift;
77 my $out = '';
78 foreach (unpack('W*', $in)) {
79 $out .= sprintf('\x%02x', $_);
80 }
81 return $out;
82}
83
84sub check_bits
85{
ac27d13b 86 local $Level = $Level + 2;
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JH
87 my ($got, $exp, $desc) = @_;
88 if (! ok($got eq $exp, $desc)) {
89 diag(' got: ' . show_bits($got));
90 diag('expected: ' . show_bits($exp));
91 }
92}
93
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94sub testwarn {
95 my $w = shift;
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96 my $id = shift;
97 check_bits( (caller(0))[9], $w, "warnings match caller ($id)");
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98}
99
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100{
101 no warnings;
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102 # Build the warnings mask dynamically
103 my ($default, $registered);
104 BEGIN {
105 for my $i (0..$warnings::LAST_BIT/2 - 1) {
106 vec($default, $i, 2) = 1;
107 }
108 $registered = $default;
109 vec($registered, $warnings::LAST_BIT/2, 2) = 1;
110 }
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111
112 # The repetition number must be set to the value of $BYTES in
113 # lib/warnings.pm
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114 BEGIN { check_bits( ${^WARNING_BITS}, "\0" x 13, 'all bits off via "no warnings"' ) }
115 testwarn("\0" x 13, 'no bits');
2db3864f 116
75b6c4ca 117 use warnings;
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118 BEGIN { check_bits( ${^WARNING_BITS}, $default,
119 'default bits on via "use warnings"' ); }
120 BEGIN { testwarn($default, 'all'); }
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121 # run-time :
122 # the warning mask has been extended by warnings::register
ac27d13b 123 testwarn($registered, 'ahead of w::r');
2db3864f 124
75b6c4ca 125 use warnings::register;
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126 BEGIN { check_bits( ${^WARNING_BITS}, $registered,
127 'warning bits on via "use warnings::register"' ) }
128 testwarn($registered, 'following w::r');
75b6c4ca 129}
f2a7f298 130
131
132# The next two cases test for a bug where caller ignored evals if
133# the DB::sub glob existed but &DB::sub did not (for example, if
134# $^P had been set but no debugger has been loaded). The tests
135# thus assume that there is no &DB::sub: if there is one, they
136# should both pass no matter whether or not this bug has been
137# fixed.
138
139my $debugger_test = q<
140 my @stackinfo = caller(0);
141 return scalar @stackinfo;
142>;
143
144sub pb { return (caller(0))[3] }
145
146my $i = eval $debugger_test;
b3ca2e83 147is( $i, 11, "do not skip over eval (and caller returns 10 elements)" );
f2a7f298 148
149is( eval 'pb()', 'main::pb', "actually return the right function name" );
150
151my $saved_perldb = $^P;
152$^P = 16;
153$^P = $saved_perldb;
154
155$i = eval $debugger_test;
b3ca2e83 156is( $i, 11, 'do not skip over eval even if $^P had been on at some point' );
f2a7f298 157is( eval 'pb()', 'main::pb', 'actually return the right function name even if $^P had been on at some point' );
158
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159print "# caller can now return the compile time state of %^H\n";
160
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161sub hint_exists {
162 my $key = shift;
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163 my $level = shift;
164 my @results = caller($level||0);
d8c5b3c5 165 exists $results[10]->{$key};
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166}
167
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168sub hint_fetch {
169 my $key = shift;
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170 my $level = shift;
171 my @results = caller($level||0);
d8c5b3c5 172 $results[10]->{$key};
b3ca2e83 173}
71860c90 174
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NC
175{
176 my $tmpfile = tempfile();
177
178 open my $fh, '>', $tmpfile or die "open $tmpfile: $!";
179 print $fh <<'EOP';
180#!perl -wl
181use strict;
182
183{
184 package KAZASH ;
185
186 sub DESTROY {
187 print "DESTROY";
188 }
189}
190
191@DB::args = bless [], 'KAZASH';
192
193print $^P;
194print scalar @DB::args;
195
196{
197 local $^P = shift;
198}
199
200@DB::args = (); # At this point, the object should be freed.
201
202print $^P;
203print scalar @DB::args;
204
205# It shouldn't leak.
206EOP
ade9cf97 207 close $fh;
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208
209 foreach (0, 1) {
210 my $got = runperl(progfile => $tmpfile, args => [$_]);
211 $got =~ s/\s+/ /gs;
212 like($got, qr/\s*0 1 DESTROY 0 0\s*/,
213 "\@DB::args doesn't leak with \$^P = $_");
214 }
215}
216
af80dd86
FC
217# This also used to leak [perl #97010]:
218{
219 my $gone;
220 sub fwib::DESTROY { ++$gone }
221 package DB;
222 sub { () = caller(0) }->(); # initialise PL_dbargs
223 @args = bless[],'fwib';
224 sub { () = caller(0) }->(); # clobber @args without initialisation
225 ::is $gone, 1, 'caller does not leak @DB::args elems when AvREAL';
226}
227
e1a80902
FC
228# And this crashed [perl #93320]:
229sub {
230 package DB;
231 ()=caller(0);
232 undef *DB::args;
233 ()=caller(0);
234}->();
235pass 'No crash when @DB::args is freed between caller calls';
236
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FC
237# This also crashed:
238package glelp;
239sub TIEARRAY { bless [] }
240sub EXTEND { }
241sub CLEAR { }
242sub FETCH { $_[0][$_[1]] }
243sub STORE { $_[0][$_[1]] = $_[2] }
244package DB;
245tie @args, 'glelp';
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FC
246eval { sub { () = caller 0; } ->(1..3) };
247::like $@, qr "^Cannot set tied \@DB::args at ",
248 'caller dies with tie @DB::args';
249::ok tied @args, '@DB::args is still tied';
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250untie @args;
251package main;
252
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FC
253# [perl #113486]
254fresh_perl_is <<'END', "ok\n", {},
255 { package foo; sub bar { main::bar() } }
256 sub bar {
257 delete $::{"foo::"};
258 my $x = \($1+2);
259 my $y = \($1+2); # this is the one that reuses the mem addr, but
260 my $z = \($1+2); # try the others just in case
261 s/2// for $$x, $$y, $$z; # now SvOOK
262 $x = caller;
263 print "ok\n";
264};
265foo::bar
266END
267 "No crash when freed stash is reused for PV with offset hack";
268
d8c5b3c5 269$::testing_caller = 1;
a24d89c9 270
e81465be 271do './op/caller.pl' or die $@;