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don't crash on deep recursion warnings in lexical subs (#118521)
[perl5.git] / t / op / lexsub.t
CommitLineData
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1#!perl
2
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3BEGIN {
4 chdir 't';
4b473a5a 5 @INC = '../lib';
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6 require './test.pl';
7 *bar::is = *is;
21452252 8 *bar::like = *like;
39075fb1 9}
4b473a5a 10no warnings 'deprecated';
07b2687d 11plan 135;
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12
13# -------------------- Errors with feature disabled -------------------- #
14
15eval "#line 8 foo\nmy sub foo";
16is $@, qq 'Experimental "my" subs not enabled at foo line 8.\n',
17 'my sub unexperimental error';
18eval "#line 8 foo\nCORE::state sub foo";
19is $@, qq 'Experimental "state" subs not enabled at foo line 8.\n',
20 'state sub unexperimental error';
21eval "#line 8 foo\nour sub foo";
22is $@, qq 'Experimental "our" subs not enabled at foo line 8.\n',
23 'our sub unexperimental error';
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24
25# -------------------- our -------------------- #
c07656ed 26
f1d34ca8 27no warnings "experimental::lexical_subs";
e7d0b801 28use feature 'lexical_subs';
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29{
30 our sub foo { 42 }
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31 is foo, 42, 'calling our sub from same package';
32 is &foo, 42, 'calling our sub from same package (amper)';
4b473a5a 33 is do foo(), 42, 'calling our sub from same package (do)';
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34 package bar;
35 sub bar::foo { 43 }
18f70389 36 is foo, 42, 'calling our sub from another package';
39075fb1 37 is &foo, 42, 'calling our sub from another package (amper)';
4b473a5a 38 is do foo(), 42, 'calling our sub from another package (do)';
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39}
40package bar;
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41is foo, 43, 'our sub falling out of scope';
42is &foo, 43, 'our sub falling out of scope (called via amper)';
4b473a5a 43is do foo(), 43, 'our sub falling out of scope (called via amper)';
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44package main;
45{
46 sub bar::a { 43 }
47 our sub a {
48 if (shift) {
49 package bar;
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50 is a, 43, 'our sub invisible inside itself';
51 is &a, 43, 'our sub invisible inside itself (called via amper)';
4b473a5a 52 is do a(), 43, 'our sub invisible inside itself (called via do)';
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53 }
54 42
55 }
56 a(1);
57 sub bar::b { 43 }
58 our sub b;
59 our sub b {
60 if (shift) {
61 package bar;
18f70389 62 is b, 42, 'our sub visible inside itself after decl';
39075fb1 63 is &b, 42, 'our sub visible inside itself after decl (amper)';
4b473a5a 64 is do b(), 42, 'our sub visible inside itself after decl (do)';
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65 }
66 42
67 }
68 b(1)
69}
70sub c { 42 }
71sub bar::c { 43 }
72{
73 our sub c;
74 package bar;
18f70389 75 is c, 42, 'our sub foo; makes lex alias for existing sub';
39075fb1 76 is &c, 42, 'our sub foo; makes lex alias for existing sub (amper)';
4b473a5a 77 is do c(), 42, 'our sub foo; makes lex alias for existing sub (do)';
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78}
79{
80 our sub d;
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81 sub bar::d { 'd43' }
82 package bar;
945534e1 83 sub d { 'd42' }
4210d3f1 84 is eval ::d, 'd42', 'our sub foo; applies to subsequent sub foo {}';
c07656ed 85}
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86{
87 our sub e ($);
88 is prototype "::e", '$', 'our sub with proto';
89}
18f70389 90{
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91 our sub if() { 42 }
92 my $x = if if if;
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93 is $x, 42, 'lexical subs (even our) override all keywords';
94 package bar;
95 my $y = if if if;
96 is $y, 42, 'our subs from other packages override all keywords';
18f70389 97}
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98
99# -------------------- state -------------------- #
100
e7d0b801 101use feature 'state'; # state
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102{
103 state sub foo { 44 }
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104 isnt \&::foo, \&foo, 'state sub is not stored in the package';
105 is eval foo, 44, 'calling state sub from same package';
106 is eval &foo, 44, 'calling state sub from same package (amper)';
107 is eval do foo(), 44, 'calling state sub from same package (do)';
21452252 108 package bar;
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109 is eval foo, 44, 'calling state sub from another package';
110 is eval &foo, 44, 'calling state sub from another package (amper)';
111 is eval do foo(), 44, 'calling state sub from another package (do)';
21452252 112}
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113package bar;
114is foo, 43, 'state sub falling out of scope';
115is &foo, 43, 'state sub falling out of scope (called via amper)';
116is do foo(), 43, 'state sub falling out of scope (called via amper)';
117{
118 sub sa { 43 }
119 state sub sa {
120 if (shift) {
121 is sa, 43, 'state sub invisible inside itself';
122 is &sa, 43, 'state sub invisible inside itself (called via amper)';
123 is do sa(), 43, 'state sub invisible inside itself (called via do)';
124 }
125 44
126 }
21452252 127 sa(1);
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128 sub sb { 43 }
129 state sub sb;
130 state sub sb {
131 if (shift) {
132 # ‘state sub foo{}’ creates a new pad entry, not reusing the forward
133 # declaration. Being invisible inside itself, it sees the stub.
134 eval{sb};
135 like $@, qr/^Undefined subroutine &sb called at /,
136 'state sub foo {} after forward declaration';
137 eval{&sb};
138 like $@, qr/^Undefined subroutine &sb called at /,
139 'state sub foo {} after forward declaration (amper)';
140 eval{do sb()};
141 like $@, qr/^Undefined subroutine &sb called at /,
142 'state sub foo {} after forward declaration (do)';
143 }
144 44
145 }
21452252 146 sb(1);
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147 sub sb2 { 43 }
148 state sub sb2;
149 sub sb2 {
150 if (shift) {
151 package bar;
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152 is sb2, 44, 'state sub visible inside itself after decl';
153 is &sb2, 44, 'state sub visible inside itself after decl (amper)';
154 is do sb2(), 44, 'state sub visible inside itself after decl (do)';
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155 }
156 44
157 }
21452252 158 sb2(1);
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159 state sub sb3;
160 {
161 state sub sb3 { # new pad entry
162 # The sub containing this comment is invisible inside itself.
163 # So this one here will assign to the outer pad entry:
164 sub sb3 { 47 }
165 }
166 }
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167 is eval{sb3}, 47,
168 'sub foo{} applying to "state sub foo;" even inside state sub foo{}';
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169 # Same test again, but inside an anonymous sub
170 sub {
171 state sub sb4;
172 {
173 state sub sb4 {
174 sub sb4 { 47 }
175 }
176 }
177 is sb4, 47,
178 'sub foo{} applying to "state sub foo;" even inside state sub foo{}';
179 }->();
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180}
181sub sc { 43 }
182{
183 state sub sc;
184 eval{sc};
251a11d5 185 like $@, qr/^Undefined subroutine &sc called at /,
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186 'state sub foo; makes no lex alias for existing sub';
187 eval{&sc};
251a11d5 188 like $@, qr/^Undefined subroutine &sc called at /,
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189 'state sub foo; makes no lex alias for existing sub (amper)';
190 eval{do sc()};
251a11d5 191 like $@, qr/^Undefined subroutine &sc called at /,
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192 'state sub foo; makes no lex alias for existing sub (do)';
193}
194package main;
195{
196 state sub se ($);
197 is prototype eval{\&se}, '$', 'state sub with proto';
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198 is prototype "se", undef, 'prototype "..." ignores state subs';
199}
200{
201 state sub if() { 44 }
202 my $x = if if if;
203 is $x, 44, 'state subs override all keywords';
204 package bar;
205 my $y = if if if;
206 is $y, 44, 'state subs from other packages override all keywords';
207}
208{
64fbf0dd 209 use warnings; no warnings "experimental::lexical_subs";
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210 state $w ;
211 local $SIG{__WARN__} = sub { $w .= shift };
212 eval '#line 87 squidges
213 state sub foo;
214 state sub foo {};
215 ';
21452252 216 is $w,
4eb94d7c 217 '"state" subroutine &foo masks earlier declaration in same scope at '
21452252 218 . "squidges line 88.\n",
4eb94d7c 219 'warning for state sub masking earlier declaration';
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220}
221# Since state vars inside anonymous subs are cloned at the same time as the
222# anonymous subs containing them, the same should happen for state subs.
223sub make_closure {
e07561e6 224 my $x = shift;
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225 sub {
226 state sub foo { $x }
e07561e6 227 foo
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228 }
229}
230$sub1 = make_closure 48;
231$sub2 = make_closure 49;
232is &$sub1, 48, 'state sub in closure (1)';
97b03d64 233is &$sub2, 49, 'state sub in closure (2)';
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234# But we need to test that state subs actually do persist from one invoca-
235# tion of a named sub to another (i.e., that they are not my subs).
236{
64fbf0dd 237 use warnings; no warnings "experimental::lexical_subs";
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238 state $w;
239 local $SIG{__WARN__} = sub { $w .= shift };
240 eval '#line 65 teetet
241 sub foom {
242 my $x = shift;
243 state sub poom { $x }
244 eval{\&poom}
245 }
246 ';
247 is $w, "Variable \"\$x\" will not stay shared at teetet line 67.\n",
248 'state subs get "Variable will not stay shared" messages';
249 my $poom = foom(27);
250 my $poom2 = foom(678);
251 is eval{$poom->()}, eval {$poom2->()},
252 'state subs close over the first outer my var, like pkg subs';
253 my $x = 43;
254 for $x (765) {
255 state sub etetetet { $x }
c8e83515 256 is eval{etetetet}, 43, 'state sub ignores for() localisation';
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257 }
258}
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259# And we also need to test that multiple state subs can close over each
260# other’s entries in the parent subs pad, and that cv_clone is not con-
261# fused by that.
262sub make_anon_with_state_sub{
263 sub {
264 state sub s1;
265 state sub s2 { \&s1 }
266 sub s1 { \&s2 }
267 if (@_) { return \&s1 }
268 is s1,\&s2, 'state sub in anon closure closing over sibling state sub';
269 is s2,\&s1, 'state sub in anon closure closing over sibling state sub';
270 }
271}
272{
273 my $s = make_anon_with_state_sub;
274 &$s;
275
276 # And make sure the state subs were actually cloned.
277 isnt make_anon_with_state_sub->(0), &$s(0),
278 'state subs in anon subs are cloned';
279 is &$s(0), &$s(0), 'but only when the anon sub is cloned';
280}
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281{
282 state sub BEGIN { exit };
283 pass 'state subs are never special blocks';
284 state sub END { shift }
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285 is eval{END('jkqeudth')}, jkqeudth,
286 'state sub END {shift} implies @_, not @ARGV';
287}
288{
289 state sub redef {}
64fbf0dd 290 use warnings; no warnings "experimental::lexical_subs";
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291 state $w;
292 local $SIG{__WARN__} = sub { $w .= shift };
293 eval "#line 56 pygpyf\nsub redef {}";
294 is $w, "Subroutine redef redefined at pygpyf line 56.\n",
295 "sub redefinition warnings from state subs";
296}
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297{
298 state sub p (\@) {
299 is ref $_[0], 'ARRAY', 'state sub with proto';
300 }
301 p(my @a);
9a5e6f3c 302 p my @b;
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303 state sub q () { 45 }
304 is q(), 45, 'state constant called with parens';
279d09bf 305}
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306{
307 state sub x;
308 eval 'sub x {3}';
309 is x, 3, 'state sub defined inside eval';
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310
311 sub r {
312 state sub foo { 3 };
313 if (@_) { # outer call
314 r();
315 is foo(), 42,
316 'state sub run-time redefinition applies to all recursion levels';
317 }
318 else { # inner call
319 eval 'sub foo { 42 }';
320 }
321 }
322 r(1);
c388b213 323}
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324like runperl(
325 switches => [ '-Mfeature=:all' ],
326 prog => 'state sub a { foo ref } a()',
327 stderr => 1
328 ),
329 qr/syntax error/,
330 'referencing a state sub after a syntax error does not crash';
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331
332# -------------------- my -------------------- #
333
334{
335 my sub foo { 44 }
336 isnt \&::foo, \&foo, 'my sub is not stored in the package';
337 is foo, 44, 'calling my sub from same package';
338 is &foo, 44, 'calling my sub from same package (amper)';
339 is do foo(), 44, 'calling my sub from same package (do)';
340 package bar;
341 is foo, 44, 'calling my sub from another package';
342 is &foo, 44, 'calling my sub from another package (amper)';
343 is do foo(), 44, 'calling my sub from another package (do)';
344}
345package bar;
346is foo, 43, 'my sub falling out of scope';
347is &foo, 43, 'my sub falling out of scope (called via amper)';
348is do foo(), 43, 'my sub falling out of scope (called via amper)';
349{
350 sub ma { 43 }
351 my sub ma {
352 if (shift) {
353 is ma, 43, 'my sub invisible inside itself';
354 is &ma, 43, 'my sub invisible inside itself (called via amper)';
355 is do ma(), 43, 'my sub invisible inside itself (called via do)';
356 }
357 44
358 }
359 ma(1);
360 sub mb { 43 }
361 my sub mb;
362 my sub mb {
363 if (shift) {
364 # ‘my sub foo{}’ creates a new pad entry, not reusing the forward
365 # declaration. Being invisible inside itself, it sees the stub.
366 eval{mb};
367 like $@, qr/^Undefined subroutine &mb called at /,
368 'my sub foo {} after forward declaration';
369 eval{&mb};
370 like $@, qr/^Undefined subroutine &mb called at /,
371 'my sub foo {} after forward declaration (amper)';
372 eval{do mb()};
373 like $@, qr/^Undefined subroutine &mb called at /,
374 'my sub foo {} after forward declaration (do)';
375 }
376 44
377 }
378 mb(1);
379 sub mb2 { 43 }
380 my sub sb2;
381 sub mb2 {
382 if (shift) {
383 package bar;
384 is mb2, 44, 'my sub visible inside itself after decl';
385 is &mb2, 44, 'my sub visible inside itself after decl (amper)';
386 is do mb2(), 44, 'my sub visible inside itself after decl (do)';
387 }
388 44
389 }
390 mb2(1);
391 my sub mb3;
392 {
393 my sub mb3 { # new pad entry
394 # The sub containing this comment is invisible inside itself.
395 # So this one here will assign to the outer pad entry:
396 sub mb3 { 47 }
397 }
398 }
399 is eval{mb3}, 47,
400 'sub foo{} applying to "my sub foo;" even inside my sub foo{}';
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401 # Same test again, but inside an anonymous sub
402 sub {
403 my sub mb4;
404 {
405 my sub mb4 {
406 sub mb4 { 47 }
407 }
408 }
409 is mb4, 47,
410 'sub foo{} applying to "my sub foo;" even inside my sub foo{}';
411 }->();
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412}
413sub mc { 43 }
414{
415 my sub mc;
416 eval{mc};
417 like $@, qr/^Undefined subroutine &mc called at /,
418 'my sub foo; makes no lex alias for existing sub';
419 eval{&mc};
420 like $@, qr/^Undefined subroutine &mc called at /,
421 'my sub foo; makes no lex alias for existing sub (amper)';
422 eval{do mc()};
423 like $@, qr/^Undefined subroutine &mc called at /,
424 'my sub foo; makes no lex alias for existing sub (do)';
425}
426package main;
427{
428 my sub me ($);
429 is prototype eval{\&me}, '$', 'my sub with proto';
430 is prototype "me", undef, 'prototype "..." ignores my subs';
431}
432{
433 my sub if() { 44 }
434 my $x = if if if;
435 is $x, 44, 'my subs override all keywords';
436 package bar;
437 my $y = if if if;
438 is $y, 44, 'my subs from other packages override all keywords';
439}
440{
64fbf0dd 441 use warnings; no warnings "experimental::lexical_subs";
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442 my $w ;
443 local $SIG{__WARN__} = sub { $w .= shift };
444 eval '#line 87 squidges
445 my sub foo;
446 my sub foo {};
447 ';
448 is $w,
449 '"my" subroutine &foo masks earlier declaration in same scope at '
450 . "squidges line 88.\n",
451 'warning for my sub masking earlier declaration';
452}
453# Test that my subs are cloned inside anonymous subs.
454sub mmake_closure {
455 my $x = shift;
456 sub {
457 my sub foo { $x }
458 foo
459 }
460}
461$sub1 = mmake_closure 48;
462$sub2 = mmake_closure 49;
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463is &$sub1, 48, 'my sub in closure (1)';
464is &$sub2, 49, 'my sub in closure (2)';
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465# Test that they are cloned in named subs.
466{
64fbf0dd 467 use warnings; no warnings "experimental::lexical_subs";
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468 my $w;
469 local $SIG{__WARN__} = sub { $w .= shift };
470 eval '#line 65 teetet
6d5c2147 471 sub mfoom {
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472 my $x = shift;
473 my sub poom { $x }
6d5c2147 474 \&poom
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475 }
476 ';
477 is $w, undef, 'my subs get no "Variable will not stay shared" messages';
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478 my $poom = mfoom(27);
479 my $poom2 = mfoom(678);
480 is $poom->(), 27, 'my subs closing over outer my var (1)';
481 is $poom2->(), 678, 'my subs closing over outer my var (2)';
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482 my $x = 43;
483 my sub aoeu;
484 for $x (765) {
485 my sub etetetet { $x }
6d5c2147 486 sub aoeu { $x }
194774c2 487 is etetetet, 765, 'my sub respects for() localisation';
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488 is aoeu, 43, 'unless it is declared outside the for loop';
489 }
490}
491# And we also need to test that multiple my subs can close over each
492# other’s entries in the parent subs pad, and that cv_clone is not con-
493# fused by that.
494sub make_anon_with_my_sub{
495 sub {
496 my sub s1;
497 my sub s2 { \&s1 }
498 sub s1 { \&s2 }
499 if (@_) { return eval { \&s1 } }
500 is eval{s1},eval{\&s2}, 'my sub in anon closure closing over sibling my sub';
501 is eval{s2},eval{\&s1}, 'my sub in anon closure closing over sibling my sub';
502 }
503}
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504
505# Test my subs inside predeclared my subs
506{
507 my sub s2;
508 sub s2 {
509 my $x = 3;
510 my sub s3 { eval '$x' }
511 s3;
512 }
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513 is s2, 3, 'my sub inside predeclared my sub';
514}
515
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516{
517 my $s = make_anon_with_my_sub;
518 &$s;
519
520 # And make sure the my subs were actually cloned.
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521 isnt make_anon_with_my_sub->(0), &$s(0),
522 'my subs in anon subs are cloned';
523 isnt &$s(0), &$s(0), 'at each invocation of the enclosing sub';
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524}
525{
526 my sub BEGIN { exit };
527 pass 'my subs are never special blocks';
528 my sub END { shift }
529 is END('jkqeudth'), jkqeudth,
530 'my sub END {shift} implies @_, not @ARGV';
531}
532{
533 my sub redef {}
64fbf0dd 534 use warnings; no warnings "experimental::lexical_subs";
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535 my $w;
536 local $SIG{__WARN__} = sub { $w .= shift };
537 eval "#line 56 pygpyf\nsub redef {}";
538 is $w, "Subroutine redef redefined at pygpyf line 56.\n",
539 "sub redefinition warnings from my subs";
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540
541 undef $w;
542 sub {
543 my sub x {};
544 sub { eval "#line 87 khaki\n\\&x" }
545 }->()();
546 is $w, "Subroutine \"&x\" is not available at khaki line 87.\n",
547 "unavailability warning during compilation of eval in closure";
548
549 undef $w;
550 no warnings 'void';
551 eval <<'->()();';
552#line 87 khaki
553 sub {
554 my sub x{}
555 sub not_lexical8 {
556 \&x
557 }
558 }
559->()();
560 is $w, "Subroutine \"&x\" is not available at khaki line 90.\n",
561 "unavailability warning during compilation of named sub in anon";
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562
563 undef $w;
564 sub not_lexical9 {
565 my sub x {};
566 format =
567@
568&x
569.
570 }
571 eval { write };
572 my($f,$l) = (__FILE__,__LINE__ - 1);
573 is $w, "Subroutine \"&x\" is not available at $f line $l.\n",
574 'unavailability warning during cloning';
575 $l -= 3;
576 is $@, "Undefined subroutine &x called at $f line $l.\n",
577 'Vivified sub is correctly named';
194774c2 578}
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579sub not_lexical10 {
580 my sub foo;
581 foo();
582 sub not_lexical11 {
583 my sub bar {
584 my $x = 'khaki car keys for the khaki car';
585 not_lexical10();
586 sub foo {
587 is $x, 'khaki car keys for the khaki car',
588 'mysubs in inner clonables use the running clone of their CvOUTSIDE'
589 }
590 }
591 bar()
592 }
593}
594not_lexical11();
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595{
596 my sub p (\@) {
597 is ref $_[0], 'ARRAY', 'my sub with proto';
598 }
599 p(my @a);
9a5e6f3c 600 p @a;
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601 my sub q () { 46 }
602 is q(), 46, 'my constant called with parens';
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603}
604{
605 my sub x;
606 my $count;
607 sub x { x() if $count++ < 10 }
608 x();
609 is $count, 11, 'my recursive subs';
610}
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611{
612 my sub x;
613 eval 'sub x {3}';
614 is x, 3, 'my sub defined inside eval';
615}
6d5c2147 616
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617{
618 state $w;
619 local $SIG{__WARN__} = sub { $w .= shift };
620 eval q{ my sub george () { 2 } };
621 is $w, undef, 'no double free from constant my subs';
622}
fe54d63b
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623like runperl(
624 switches => [ '-Mfeature=:all' ],
625 prog => 'my sub a { foo ref } a()',
626 stderr => 1
627 ),
628 qr/syntax error/,
629 'referencing a my sub after a syntax error does not crash';
4ded55f3 630
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FC
631# -------------------- Interactions (and misc tests) -------------------- #
632
633is sub {
634 my sub s1;
635 my sub s2 { 3 };
636 sub s1 { state sub foo { \&s2 } foo }
637 s1
638 }->()(), 3, 'state sub inside my sub closing over my sub uncle';
639
0afba48f
FC
640{
641 my sub s2 { 3 };
642 sub not_lexical { state sub foo { \&s2 } foo }
643 is not_lexical->(), 3, 'state subs that reference my sub from outside';
644}
645
646# Test my subs inside predeclared package subs
647# This test also checks that CvOUTSIDE pointers are not mangled when the
648# inner sub’s CvOUTSIDE points to another sub.
649sub not_lexical2;
650sub not_lexical2 {
651 my $x = 23;
652 my sub bar;
653 sub not_lexical3 {
654 not_lexical2();
655 sub bar { $x }
656 };
657 bar
658}
0afba48f
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659is not_lexical3, 23, 'my subs inside predeclared package subs';
660
661# Test my subs inside predeclared package sub, where the lexical sub is
662# declared outside the package sub.
663# This checks that CvOUTSIDE pointers are fixed up even when the sub is
664# not declared inside the sub that its CvOUTSIDE points to.
8d88fe29 665sub not_lexical5 {
0afba48f
FC
666 my sub foo;
667 sub not_lexical4;
668 sub not_lexical4 {
669 my $x = 234;
8d88fe29 670 not_lexical5();
0afba48f 671 sub foo { $x }
0afba48f 672 }
8d88fe29 673 foo
0afba48f 674}
8d88fe29
FC
675is not_lexical4, 234,
676 'my sub defined in predeclared pkg sub but declared outside';
1f122f9b
FC
677
678undef *not_lexical6;
679{
680 my sub foo;
681 sub not_lexical6 { sub foo { } }
682 pass 'no crash when cloning a mysub declared inside an undef pack sub';
683}
9ccc915e
FC
684
685undef &not_lexical7;
686eval 'sub not_lexical7 { my @x }';
687{
688 my sub foo;
689 foo();
690 sub not_lexical7 {
691 state $x;
692 sub foo {
693 is ref \$x, 'SCALAR',
694 "redeffing a mysub's outside does not make it use the wrong pad"
695 }
696 }
697}
07b2687d
LM
698
699like runperl(
700 switches => [ '-Mfeature=:all', '-Mwarnings=FATAL,all', '-M-warnings=experimental::lexical_subs' ],
701 prog => 'my sub foo; sub foo { foo } foo',
702 stderr => 1
703 ),
704 qr/Deep recursion on subroutine "foo"/,
705 'deep recursion warnings for lexical subs do not crash';