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handle freed backref array in global cleanup
[perl5.git] / t / op / ref.t
CommitLineData
79072805
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1#!./perl
2
20274adc
JH
3BEGIN {
4 chdir 't' if -d 't';
b5fe401b 5 @INC = qw(. ../lib);
e47aeb22 6 require 'test.pl';
20274adc
JH
7}
8
e24631be 9use strict qw(refs subs);
79072805 10
da0c0b27 11plan(217);
805232b4 12
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13# Test glob operations.
14
1c509eb9
NC
15$bar = "one";
16$foo = "two";
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LW
17{
18 local(*foo) = *bar;
1c509eb9 19 is($foo, 'one');
79072805 20}
1c509eb9 21is ($foo, 'two');
79072805 22
1c509eb9
NC
23$baz = "three";
24$foo = "four";
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LW
25{
26 local(*foo) = 'baz';
1c509eb9 27 is ($foo, 'three');
79072805 28}
1c509eb9 29is ($foo, 'four');
79072805 30
1c509eb9 31$foo = "global";
79072805
LW
32{
33 local(*foo);
1c509eb9
NC
34 is ($foo, undef);
35 $foo = "local";
36 is ($foo, 'local');
79072805 37}
1c509eb9 38is ($foo, 'global');
79072805 39
e24631be
NC
40{
41 no strict 'refs';
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42# Test fake references.
43
e24631be
NC
44 $baz = "valid";
45 $bar = 'baz';
46 $foo = 'bar';
47 is ($$$foo, 'valid');
48}
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49
50# Test real references.
51
52$FOO = \$BAR;
53$BAR = \$BAZ;
1c509eb9
NC
54$BAZ = "hit";
55is ($$$FOO, 'hit');
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LW
56
57# Test references to real arrays.
58
1c509eb9
NC
59my $test = curr_test();
60@ary = ($test,$test+1,$test+2,$test+3);
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61$ref[0] = \@a;
62$ref[1] = \@b;
63$ref[2] = \@c;
64$ref[3] = \@d;
65for $i (3,1,2,0) {
66 push(@{$ref[$i]}, "ok $ary[$i]\n");
67}
68print @a;
69print ${$ref[1]}[0];
70print @{$ref[2]}[0];
e24631be
NC
71{
72 no strict 'refs';
73 print @{'d'};
74}
1c509eb9 75curr_test($test+4);
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LW
76
77# Test references to references.
78
79$refref = \\$x;
1c509eb9
NC
80$x = "Good";
81is ($$$refref, 'Good');
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82
83# Test nested anonymous lists.
84
85$ref = [[],2,[3,4,5,]];
1c509eb9
NC
86is (scalar @$ref, 3);
87is ($$ref[1], 2);
88is (${$$ref[2]}[2], 5);
89is (scalar @{$$ref[0]}, 0);
79072805 90
1c509eb9
NC
91is ($ref->[1], 2);
92is ($ref->[2]->[0], 3);
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LW
93
94# Test references to hashes of references.
95
96$refref = \%whatever;
97$refref->{"key"} = $ref;
1c509eb9 98is ($refref->{"key"}->[2]->[0], 3);
79072805 99
93a17b20 100# Test to see if anonymous subarrays spring into existence.
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101
102$spring[5]->[0] = 123;
103$spring[5]->[1] = 456;
104push(@{$spring[5]}, 789);
1c509eb9 105is (join(':',@{$spring[5]}), "123:456:789");
79072805 106
93a17b20 107# Test to see if anonymous subhashes spring into existence.
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108
109@{$spring2{"foo"}} = (1,2,3);
110$spring2{"foo"}->[3] = 4;
1c509eb9 111is (join(':',@{$spring2{"foo"}}), "1:2:3:4");
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112
113# Test references to subroutines.
114
1c509eb9
NC
115{
116 my $called;
117 sub mysub { $called++; }
118 $subref = \&mysub;
119 &$subref;
120 is ($called, 1);
121}
79072805 122
e47aeb22
FC
123# Test references to return values of operators (TARGs/PADTMPs)
124{
125 my @refs;
126 for("a", "b") {
127 push @refs, \"$_"
128 }
129 is join(" ", map $$_, @refs), "a b", 'refgen+PADTMP';
130}
131
79072805 132$subrefref = \\&mysub2;
1c509eb9
NC
133is ($$subrefref->("GOOD"), "good");
134sub mysub2 { lc shift }
79072805 135
f0826785
BM
136# Test REGEXP assignment
137
293c724a
NC
138SKIP: {
139 skip_if_miniperl("no dynamic loading on miniperl, so can't load re", 5);
140 require re;
f0826785
BM
141 my $x = qr/x/;
142 my $str = "$x"; # regex stringification may change
143
144 my $y = $$x;
145 is ($y, $str, "bare REGEXP stringifies correctly");
146 ok (eval { "x" =~ $y }, "bare REGEXP matches correctly");
147
148 my $z = \$y;
149 ok (re::is_regexp($z), "new ref to REXEXP passes is_regexp");
150 is ($z, $str, "new ref to REGEXP stringifies correctly");
151 ok (eval { "x" =~ $z }, "new ref to REGEXP matches correctly");
152}
153{
154 my ($x, $str);
155 {
156 my $y = qr/x/;
157 $str = "$y";
158 $x = $$y;
159 }
160 is ($x, $str, "REGEXP keeps a ref to its mother_re");
161 ok (eval { "x" =~ $x }, "REGEXP with mother_re still matches");
162}
163
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164# Test the ref operator.
165
6e592b3a
BM
166sub PVBM () { 'foo' }
167{ my $dummy = index 'foo', PVBM }
168
169my $pviv = 1; "$pviv";
170my $pvnv = 1.0; "$pvnv";
171my $x;
172
173# we don't test
174# tied lvalue => SCALAR, as we haven't tested tie yet
175# BIND, 'cos we can't create them yet
176# REGEXP, 'cos that requires overload or Scalar::Util
177# LVALUE ref, 'cos I can't work out how to create one :)
178
179for (
180 [ 'undef', SCALAR => \undef ],
181 [ 'constant IV', SCALAR => \1 ],
182 [ 'constant NV', SCALAR => \1.0 ],
183 [ 'constant PV', SCALAR => \'f' ],
184 [ 'scalar', SCALAR => \$x ],
185 [ 'PVIV', SCALAR => \$pviv ],
186 [ 'PVNV', SCALAR => \$pvnv ],
187 [ 'PVMG', SCALAR => \$0 ],
188 [ 'PVBM', SCALAR => \PVBM ],
189 [ 'vstring', VSTRING => \v1 ],
190 [ 'ref', REF => \\1 ],
191 [ 'lvalue', LVALUE => \substr($x, 0, 0) ],
192 [ 'named array', ARRAY => \@ary ],
193 [ 'anon array', ARRAY => [ 1 ] ],
194 [ 'named hash', HASH => \%whatever ],
195 [ 'anon hash', HASH => { a => 1 } ],
196 [ 'named sub', CODE => \&mysub, ],
197 [ 'anon sub', CODE => sub { 1; } ],
198 [ 'glob', GLOB => \*foo ],
199 [ 'format', FORMAT => *STDERR{FORMAT} ],
200) {
201 my ($desc, $type, $ref) = @$_;
202 is (ref $ref, $type, "ref() for ref to $desc");
203 like ("$ref", qr/^$type\(0x[0-9a-f]+\)$/, "stringify for ref to $desc");
204}
205
d963bf01
NC
206is (ref *STDOUT{IO}, 'IO::File', 'IO refs are blessed into IO::File');
207like (*STDOUT{IO}, qr/^IO::File=IO\(0x[0-9a-f]+\)$/,
6e592b3a 208 'stringify for IO refs');
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209
210# Test anonymous hash syntax.
211
212$anonhash = {};
1c509eb9 213is (ref $anonhash, 'HASH');
e24631be 214$anonhash2 = {FOO => 'BAR', ABC => 'XYZ',};
1c509eb9 215is (join('', sort values %$anonhash2), 'BARXYZ');
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216
217# Test bless operator.
218
219package MYHASH;
220
221$object = bless $main'anonhash2;
1c509eb9
NC
222main::is (ref $object, 'MYHASH');
223main::is ($object->{ABC}, 'XYZ');
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224
225$object2 = bless {};
1c509eb9 226main::is (ref $object2, 'MYHASH');
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227
228# Test ordinary call on object method.
229
1c509eb9 230&mymethod($object,"argument");
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231
232sub mymethod {
233 local($THIS, @ARGS) = @_;
ed6116ce 234 die 'Got a "' . ref($THIS). '" instead of a MYHASH'
e24631be 235 unless ref $THIS eq 'MYHASH';
1c509eb9
NC
236 main::is ($ARGS[0], "argument");
237 main::is ($THIS->{FOO}, 'BAR');
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238}
239
240# Test automatic destructor call.
241
1c509eb9 242$string = "bad";
79072805 243$object = "foo";
1c509eb9 244$string = "good";
79072805 245$main'anonhash2 = "foo";
8990e307 246$string = "";
79072805 247
ed6116ce 248DESTROY {
8990e307 249 return unless $string;
1c509eb9 250 main::is ($string, 'good');
79072805 251
a0d0e21e 252 # Test that the object has not already been "cursed".
1c509eb9 253 main::isnt (ref shift, 'HASH');
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LW
254}
255
256# Now test inheritance of methods.
257
258package OBJ;
259
e24631be 260@ISA = ('BASEOBJ');
79072805 261
e24631be 262$main'object = bless {FOO => 'foo', BAR => 'bar'};
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263
264package main;
265
266# Test arrow-style method invocation.
267
e24631be 268is ($object->doit("BAR"), 'bar');
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269
270# Test indirect-object-style method invocation.
271
272$foo = doit $object "FOO";
e24631be 273main::is ($foo, 'foo');
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LW
274
275sub BASEOBJ'doit {
276 local $ref = shift;
e24631be 277 die "Not an OBJ" unless ref $ref eq 'OBJ';
748a9306 278 $ref->{shift()};
79072805 279}
8990e307 280
a0d0e21e
LW
281package UNIVERSAL;
282@ISA = 'LASTCHANCE';
283
284package LASTCHANCE;
805232b4 285sub foo { main::is ($_[1], 'works') }
a0d0e21e
LW
286
287package WHATEVER;
805232b4 288foo WHATEVER "works";
a0d0e21e 289
58e0a6ae
GS
290#
291# test the \(@foo) construct
292#
293package main;
fb53bbb2 294@foo = \(1..3);
58e0a6ae
GS
295@bar = \(@foo);
296@baz = \(1,@foo,@bar);
805232b4
NC
297is (scalar (@bar), 3);
298is (scalar grep(ref($_), @bar), 3);
299is (scalar (@baz), 3);
58e0a6ae 300
fb53bbb2 301my(@fuu) = \(1..2,3);
58e0a6ae
GS
302my(@baa) = \(@fuu);
303my(@bzz) = \(1,@fuu,@baa);
805232b4
NC
304is (scalar (@baa), 3);
305is (scalar grep(ref($_), @baa), 3);
306is (scalar (@bzz), 3);
58e0a6ae 307
75ea820e
SM
308# also, it can't be an lvalue
309eval '\\($x, $y) = (1, 2);';
805232b4 310like ($@, qr/Can\'t modify.*ref.*in.*assignment/);
75ea820e 311
bc44cdaf 312# test for proper destruction of lexical objects
1c509eb9 313$test = curr_test();
805232b4
NC
314sub larry::DESTROY { print "# larry\nok $test\n"; }
315sub curly::DESTROY { print "# curly\nok ", $test + 1, "\n"; }
316sub moe::DESTROY { print "# moe\nok ", $test + 2, "\n"; }
bc44cdaf
GS
317
318{
319 my ($joe, @curly, %larry);
320 my $moe = bless \$joe, 'moe';
321 my $curly = bless \@curly, 'curly';
322 my $larry = bless \%larry, 'larry';
323 print "# leaving block\n";
324}
325
326print "# left block\n";
805232b4 327curr_test($test + 3);
bc44cdaf 328
fb73857a
PP
329# another glob test
330
805232b4
NC
331
332$foo = "garbage";
fb73857a 333{ local(*bar) = "foo" }
805232b4 334$bar = "glob 3";
fb73857a 335local(*bar) = *bar;
805232b4 336is ($bar, "glob 3");
fb73857a 337
805232b4 338$var = "glob 4";
d4010388 339$_ = \$var;
805232b4 340is ($$_, 'glob 4');
d4010388 341
4e8e7886 342
805232b4
NC
343# test if reblessing during destruction results in more destruction
344$test = curr_test();
4e8e7886
GS
345{
346 package A;
347 sub new { bless {}, shift }
805232b4 348 DESTROY { print "# destroying 'A'\nok ", $test + 1, "\n" }
8bac7e00 349 package _B;
4e8e7886 350 sub new { bless {}, shift }
805232b4 351 DESTROY { print "# destroying '_B'\nok $test\n"; bless shift, 'A' }
4e8e7886 352 package main;
8bac7e00 353 my $b = _B->new;
4e8e7886 354}
805232b4 355curr_test($test + 2);
4e8e7886
GS
356
357# test if $_[0] is properly protected in DESTROY()
358
359{
805232b4 360 my $test = curr_test();
4e8e7886
GS
361 my $i = 0;
362 local $SIG{'__DIE__'} = sub {
363 my $m = shift;
364 if ($i++ > 4) {
805232b4 365 print "# infinite recursion, bailing\nnot ok $test\n";
4e8e7886
GS
366 exit 1;
367 }
805232b4 368 like ($m, qr/^Modification of a read-only/);
4e8e7886
GS
369 };
370 package C;
371 sub new { bless {}, shift }
372 DESTROY { $_[0] = 'foo' }
373 {
374 print "# should generate an error...\n";
375 my $c = C->new;
376 }
377 print "# good, didn't recurse\n";
378}
379
5e307270
FC
380# test that DESTROY is called on all objects during global destruction,
381# even those without hard references [perl #36347]
382
7f586e41 383$TODO = 'bug #36347';
5e307270
FC
384is(
385 runperl(
c1b879e5 386 stderr => 1, prog => 'sub DESTROY { print qq-aaa\n- } bless \$a[0]'
5e307270 387 ),
c1b879e5 388 "aaa\n", 'DESTROY called on array elem'
5e307270
FC
389);
390is(
391 runperl(
392 stderr => 1,
c1b879e5 393 prog => '{ bless \my@x; *a=sub{@x}}sub DESTROY { print qq-aaa\n- }'
5e307270 394 ),
c1b879e5 395 "aaa\n",
5e307270
FC
396 'DESTROY called on closure variable'
397);
7f586e41 398$TODO = undef;
5e307270 399
0dd88869 400# test if refgen behaves with autoviv magic
0dd88869
GS
401{
402 my @a;
805232b4
NC
403 $a[1] = "good";
404 my $got;
405 for (@a) {
406 $got .= ${\$_};
407 $got .= ';';
408 }
409 is ($got, ";good;");
0dd88869
GS
410}
411
840a7b70
IZ
412# This test is the reason for postponed destruction in sv_unref
413$a = [1,2,3];
414$a = $a->[1];
805232b4 415is ($a, 2);
840a7b70 416
04ca4930
NC
417# This test used to coredump. The BEGIN block is important as it causes the
418# op that created the constant reference to be freed. Hence the only
419# reference to the constant string "pass" is in $a. The hack that made
420# sure $a = $a->[1] would work didn't work with references to constants.
421
04ca4930
NC
422
423foreach my $lexical ('', 'my $a; ') {
424 my $expect = "pass\n";
425 my $result = runperl (switches => ['-wl'], stderr => 1,
426 prog => $lexical . 'BEGIN {$a = \q{pass}}; $a = $$a; print $a');
427
805232b4
NC
428 is ($?, 0);
429 is ($result, $expect);
840a7b70
IZ
430}
431
e24631be 432$test = curr_test();
04ca4930
NC
433sub x::DESTROY {print "ok ", $test + shift->[0], "\n"}
434{ my $a1 = bless [3],"x";
435 my $a2 = bless [2],"x";
436 { my $a3 = bless [1],"x";
437 my $a4 = bless [0],"x";
438 567;
439 }
440}
805232b4
NC
441curr_test($test+4);
442
443is (runperl (switches=>['-l'],
444 prog=> 'print 1; print qq-*$\*-;print 1;'),
445 "1\n*\n*\n1\n");
b2ce0fda 446
39cff0d9
AE
447# bug #21347
448
449runperl(prog => 'sub UNIVERSAL::AUTOLOAD { qr// } a->p' );
805232b4 450is ($?, 0, 'UNIVERSAL::AUTOLOAD called when freeing qr//');
39cff0d9 451
7b102d90 452runperl(prog => 'sub UNIVERSAL::DESTROY { warn } bless \$a, A', stderr => 1);
805232b4 453is ($?, 0, 'warn called inside UNIVERSAL::DESTROY');
7b102d90 454
23bb1b96
DM
455
456# bug #22719
457
458runperl(prog => 'sub f { my $x = shift; *z = $x; } f({}); f();');
805232b4 459is ($?, 0, 'coredump on typeglob = (SvRV && !SvROK)');
23bb1b96 460
ec5f3c78
DM
461# bug #27268: freeing self-referential typeglobs could trigger
462# "Attempt to free unreferenced scalar" warnings
463
805232b4 464is (runperl(
3d7a9343 465 prog => 'use Symbol;my $x=bless \gensym,q{t}; print;*$$x=$x',
ec5f3c78 466 stderr => 1
805232b4 467), '', 'freeing self-referential typeglob');
23bb1b96 468
804ffa60
DM
469# using a regex in the destructor for STDOUT segfaulted because the
470# REGEX pad had already been freed (ithreads build only). The
471# object is required to trigger the early freeing of GV refs to to STDOUT
472
ff26e4c8
CB
473TODO: {
474 local $TODO = "works but output through pipe is mangled" if $^O eq 'VMS';
475 like (runperl(
3d7a9343 476 prog => '$x=bless[]; sub IO::Handle::DESTROY{$_=q{bad};s/bad/ok/;print}',
ff26e4c8
CB
477 stderr => 1
478 ), qr/^(ok)+$/, 'STDOUT destructor');
479}
804ffa60 480
512d1826
NC
481TODO: {
482 no strict 'refs';
483 $name8 = chr 163;
484 $name_utf8 = $name8 . chr 256;
485 chop $name_utf8;
486
487 is ($$name8, undef, 'Nothing before we start');
488 is ($$name_utf8, undef, 'Nothing before we start');
489 $$name8 = "Pound";
490 is ($$name8, "Pound", 'Accessing via 8 bit symref works');
491 local $TODO = "UTF8 mangled in symrefs";
492 is ($$name_utf8, "Pound", 'Accessing via UTF8 symref works');
493}
494
495TODO: {
496 no strict 'refs';
497 $name_utf8 = $name = chr 9787;
498 utf8::encode $name_utf8;
499
500 is (length $name, 1, "Name is 1 char");
501 is (length $name_utf8, 3, "UTF8 representation is 3 chars");
502
503 is ($$name, undef, 'Nothing before we start');
504 is ($$name_utf8, undef, 'Nothing before we start');
505 $$name = "Face";
506 is ($$name, "Face", 'Accessing via Unicode symref works');
507 local $TODO = "UTF8 mangled in symrefs";
508 is ($$name_utf8, undef,
509 'Accessing via the UTF8 byte sequence gives nothing');
510}
511
431529db 512{
512d1826
NC
513 no strict 'refs';
514 $name1 = "\0Chalk";
515 $name2 = "\0Cheese";
516
517 isnt ($name1, $name2, "They differ");
518
431529db 519 is ($$name1, undef, 'Nothing before we start (scalars)');
512d1826 520 is ($$name2, undef, 'Nothing before we start');
b3d904f3 521 $$name1 = "Yummy";
512d1826 522 is ($$name1, "Yummy", 'Accessing via the correct name works');
512d1826
NC
523 is ($$name2, undef,
524 'Accessing via a different NUL-containing name gives nothing');
fc4809d7
NC
525 # defined uses a different code path
526 ok (defined $$name1, 'defined via the correct name works');
527 ok (!defined $$name2,
528 'defined via a different NUL-containing name gives nothing');
431529db
NC
529
530 is ($name1->[0], undef, 'Nothing before we start (arrays)');
531 is ($name2->[0], undef, 'Nothing before we start');
532 $name1->[0] = "Yummy";
533 is ($name1->[0], "Yummy", 'Accessing via the correct name works');
534 is ($name2->[0], undef,
535 'Accessing via a different NUL-containing name gives nothing');
fc4809d7
NC
536 ok (defined $name1->[0], 'defined via the correct name works');
537 ok (!defined$name2->[0],
538 'defined via a different NUL-containing name gives nothing');
431529db
NC
539
540 my (undef, $one) = @{$name1}[2,3];
541 my (undef, $two) = @{$name2}[2,3];
542 is ($one, undef, 'Nothing before we start (array slices)');
543 is ($two, undef, 'Nothing before we start');
544 @{$name1}[2,3] = ("Very", "Yummy");
545 (undef, $one) = @{$name1}[2,3];
546 (undef, $two) = @{$name2}[2,3];
547 is ($one, "Yummy", 'Accessing via the correct name works');
548 is ($two, undef,
549 'Accessing via a different NUL-containing name gives nothing');
fc4809d7
NC
550 ok (defined $one, 'defined via the correct name works');
551 ok (!defined $two,
552 'defined via a different NUL-containing name gives nothing');
431529db
NC
553
554 is ($name1->{PWOF}, undef, 'Nothing before we start (hashes)');
555 is ($name2->{PWOF}, undef, 'Nothing before we start');
556 $name1->{PWOF} = "Yummy";
557 is ($name1->{PWOF}, "Yummy", 'Accessing via the correct name works');
558 is ($name2->{PWOF}, undef,
559 'Accessing via a different NUL-containing name gives nothing');
fc4809d7
NC
560 ok (defined $name1->{PWOF}, 'defined via the correct name works');
561 ok (!defined $name2->{PWOF},
562 'defined via a different NUL-containing name gives nothing');
431529db
NC
563
564 my (undef, $one) = @{$name1}{'SNIF', 'BEEYOOP'};
565 my (undef, $two) = @{$name2}{'SNIF', 'BEEYOOP'};
566 is ($one, undef, 'Nothing before we start (hash slices)');
567 is ($two, undef, 'Nothing before we start');
568 @{$name1}{'SNIF', 'BEEYOOP'} = ("Very", "Yummy");
569 (undef, $one) = @{$name1}{'SNIF', 'BEEYOOP'};
570 (undef, $two) = @{$name2}{'SNIF', 'BEEYOOP'};
571 is ($one, "Yummy", 'Accessing via the correct name works');
572 is ($two, undef,
573 'Accessing via a different NUL-containing name gives nothing');
fc4809d7
NC
574 ok (defined $one, 'defined via the correct name works');
575 ok (!defined $two,
576 'defined via a different NUL-containing name gives nothing');
431529db
NC
577
578 $name1 = "Left"; $name2 = "Left\0Right";
579 my $glob2 = *{$name2};
580
88e5f542 581 is ($glob1, undef, "We get different typeglobs. In fact, undef");
780a5241
NC
582
583 *{$name1} = sub {"One"};
584 *{$name2} = sub {"Two"};
585
586 is (&{$name1}, "One");
587 is (&{$name2}, "Two");
512d1826
NC
588}
589
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590# test derefs after list slice
591
592is ( ({foo => "bar"})[0]{foo}, "bar", 'hash deref from list slice w/o ->' );
593is ( ({foo => "bar"})[0]->{foo}, "bar", 'hash deref from list slice w/ ->' );
594is ( ([qw/foo bar/])[0][1], "bar", 'array deref from list slice w/o ->' );
595is ( ([qw/foo bar/])[0]->[1], "bar", 'array deref from list slice w/ ->' );
596is ( (sub {"bar"})[0](), "bar", 'code deref from list slice w/o ->' );
597is ( (sub {"bar"})[0]->(), "bar", 'code deref from list slice w/ ->' );
598
599# deref on empty list shouldn't autovivify
600{
601 local $@;
602 eval { ()[0]{foo} };
603 like ( "$@", "Can't use an undefined value as a HASH reference",
604 "deref of undef from list slice fails" );
605}
606
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607# test dereferencing errors
608{
2d905216
NC
609 format STDERR =
610.
611 my $ref;
612 foreach $ref (*STDOUT{IO}, *STDERR{FORMAT}) {
613 eval q/ $$ref /;
614 like($@, qr/Not a SCALAR reference/, "Scalar dereference");
615 eval q/ @$ref /;
616 like($@, qr/Not an ARRAY reference/, "Array dereference");
617 eval q/ %$ref /;
618 like($@, qr/Not a HASH reference/, "Hash dereference");
619 eval q/ &$ref /;
620 like($@, qr/Not a CODE reference/, "Code dereference");
621 }
622
623 $ref = *STDERR{FORMAT};
624 eval q/ *$ref /;
625 like($@, qr/Not a GLOB reference/, "Glob dereference");
626
627 $ref = *STDOUT{IO};
628 eval q/ *$ref /;
629 is($@, '', "Glob dereference of PVIO is acceptable");
630
631 is($ref, *{$ref}{IO}, "IO slot of the temporary glob is set correctly");
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632}
633
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BM
634# these will segfault if they fail
635
636my $pvbm = PVBM;
637my $rpvbm = \$pvbm;
638
639ok (!eval { *$rpvbm }, 'PVBM ref is not a GLOB ref');
640ok (!eval { *$pvbm }, 'PVBM is not a GLOB ref');
641ok (!eval { $$pvbm }, 'PVBM is not a SCALAR ref');
642ok (!eval { @$pvbm }, 'PVBM is not an ARRAY ref');
643ok (!eval { %$pvbm }, 'PVBM is not a HASH ref');
644ok (!eval { $pvbm->() }, 'PVBM is not a CODE ref');
645ok (!eval { $rpvbm->foo }, 'PVBM is not an object');
646
fcf99ed4
B
647# bug 24254
648is( runperl(stderr => 1, prog => 'map eval qq(exit),1 for 1'), "");
649is( runperl(stderr => 1, prog => 'eval { for (1) { map { die } 2 } };'), "");
650is( runperl(stderr => 1, prog => 'for (125) { map { exit } (213)}'), "");
54c717c3
CB
651my $hushed = $^O eq 'VMS' ? 'use vmsish qw(hushed);' : '';
652is( runperl(stderr => 1, prog => $hushed . 'map die,4 for 3'), "Died at -e line 1.\n");
653is( runperl(stderr => 1, prog => $hushed . 'grep die,4 for 3'), "Died at -e line 1.\n");
654is( runperl(stderr => 1, prog => $hushed . 'for $a (3) {@b=sort {die} 4,5}'), "Died at -e line 1.\n");
fcf99ed4
B
655
656# bug 57564
657is( runperl(stderr => 1, prog => 'my $i;for $i (1) { for $i (2) { } }'), "");
658
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DM
659# The mechanism for freeing objects in globs used to leave dangling
660# pointers to freed SVs. To test this, we construct this nested structure:
661# GV => blessed(AV) => RV => GV => blessed(SV)
662# all with a refcnt of 1, and hope that the second GV gets processed first
663# by do_clean_named_objs. Then when the first GV is processed, it mustn't
93f09d7b 664# find anything nasty left by the previous GV processing.
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DM
665# The eval is stop things in the main body of the code holding a reference
666# to a GV, and the print at the end seems to bee necessary to ensure
667# the correct freeing order of *x and *y (no, I don't know why - DAPM).
668
669is (runperl(
670 prog => 'eval q[bless \@y; bless \$x; $y[0] = \*x; $z = \*y; ]; '
bf70f410 671 . 'delete $::{x}; delete $::{y}; print qq{ok\n};',
57ef47cc
DM
672 stderr => 1),
673 "ok\n", 'freeing freed glob in global destruction');
674
fcf99ed4 675
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FC
676# Test undefined hash references as arguments to %{} in boolean context
677# [perl #81750]
678{
679 no strict 'refs';
680 eval { my $foo; %$foo; }; ok !$@, '%$undef';
681 eval { my $foo; scalar %$foo; }; ok !$@, 'scalar %$undef';
682 eval { my $foo; !%$foo; }; ok !$@, '!%$undef';
683 eval { my $foo; if ( %$foo) {} }; ok !$@, 'if ( %$undef) {}';
684 eval { my $foo; if (!%$foo) {} }; ok !$@, 'if (!%$undef) {}';
685 eval { my $foo; unless ( %$foo) {} }; ok !$@, 'unless ( %$undef) {}';
686 eval { my $foo; unless (!%$foo) {} }; ok !$@, 'unless (!%$undef) {}';
687 eval { my $foo; 1 if %$foo; }; ok !$@, '1 if %$undef';
688 eval { my $foo; 1 if !%$foo; }; ok !$@, '1 if !%$undef';
689 eval { my $foo; 1 unless %$foo; }; ok !$@, '1 unless %$undef;';
690 eval { my $foo; 1 unless ! %$foo; }; ok !$@, '1 unless ! %$undef';
691 eval { my $foo; %$foo ? 1 : 0; }; ok !$@, ' %$undef ? 1 : 0';
692 eval { my $foo; !%$foo ? 1 : 0; }; ok !$@, '!%$undef ? 1 : 0';
693}
694
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DM
695# RT #88330
696# Make sure that a leaked thinggy with multiple weak references to
697# it doesn't trigger a panic with multiple rounds of global cleanup
698# (Perl_sv_clean_all).
699
700SKIP: {
701 skip_if_miniperl('no Scalar::Util under miniperl', 4);
702
703 local $ENV{PERL_DESTRUCT_LEVEL} = 2;
704
705 # we do all permutations of array/hash, 1ref/2ref, to account
706 # for the different way backref magic is stored
707
708 fresh_perl_is(<<'EOF', 'ok', { stderr => 1 }, 'array with 1 weak ref');
709use Scalar::Util qw(weaken);
710my $r = [];
711Internals::SvREFCNT(@$r, 9);
712my $r1 = $r;
713weaken($r1);
714print "ok";
715EOF
716
717 fresh_perl_is(<<'EOF', 'ok', { stderr => 1 }, 'array with 2 weak refs');
718use Scalar::Util qw(weaken);
719my $r = [];
720Internals::SvREFCNT(@$r, 9);
721my $r1 = $r;
722weaken($r1);
723my $r2 = $r;
724weaken($r2);
725print "ok";
726EOF
727
728 fresh_perl_is(<<'EOF', 'ok', { stderr => 1 }, 'hash with 1 weak ref');
729use Scalar::Util qw(weaken);
730my $r = {};
731Internals::SvREFCNT(%$r, 9);
732my $r1 = $r;
733weaken($r1);
734print "ok";
735EOF
736
737 fresh_perl_is(<<'EOF', 'ok', { stderr => 1 }, 'hash with 2 weak refs');
738use Scalar::Util qw(weaken);
739my $r = {};
740Internals::SvREFCNT(%$r, 9);
741my $r1 = $r;
742weaken($r1);
743my $r2 = $r;
744weaken($r2);
745print "ok";
746EOF
747
748}
fd1d9b5c 749
805232b4
NC
750# Bit of a hack to make test.pl happy. There are 3 more tests after it leaves.
751$test = curr_test();
752curr_test($test + 3);
4e8e7886
GS
753# test global destruction
754
840a7b70
IZ
755my $test1 = $test + 1;
756my $test2 = $test + 2;
757
8990e307
LW
758package FINALE;
759
760{
840a7b70
IZ
761 $ref3 = bless ["ok $test2\n"]; # package destruction
762 my $ref2 = bless ["ok $test1\n"]; # lexical destruction
763 local $ref1 = bless ["ok $test\n"]; # dynamic destruction
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LW
764 1; # flush any temp values on stack
765}
766
767DESTROY {
768 print $_[0][0];
769}
804ffa60 770