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Name lexical constants
[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';
83a72a15 11plan 132;
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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 $_[0], 'ARRAY', 'state sub with proto';
300 }
301 p(my @a);
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302 state sub q () { 45 }
303 is q(), 45, 'state constant called with parens';
279d09bf 304}
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305{
306 state sub x;
307 eval 'sub x {3}';
308 is x, 3, 'state sub defined inside eval';
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309
310 sub r {
311 state sub foo { 3 };
312 if (@_) { # outer call
313 r();
314 is foo(), 42,
315 'state sub run-time redefinition applies to all recursion levels';
316 }
317 else { # inner call
318 eval 'sub foo { 42 }';
319 }
320 }
321 r(1);
c388b213 322}
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323$::TODO = ' ';
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';
331undef $::TODO;
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332
333# -------------------- my -------------------- #
334
335{
336 my sub foo { 44 }
337 isnt \&::foo, \&foo, 'my sub is not stored in the package';
338 is foo, 44, 'calling my sub from same package';
339 is &foo, 44, 'calling my sub from same package (amper)';
340 is do foo(), 44, 'calling my sub from same package (do)';
341 package bar;
342 is foo, 44, 'calling my sub from another package';
343 is &foo, 44, 'calling my sub from another package (amper)';
344 is do foo(), 44, 'calling my sub from another package (do)';
345}
346package bar;
347is foo, 43, 'my sub falling out of scope';
348is &foo, 43, 'my sub falling out of scope (called via amper)';
349is do foo(), 43, 'my sub falling out of scope (called via amper)';
350{
351 sub ma { 43 }
352 my sub ma {
353 if (shift) {
354 is ma, 43, 'my sub invisible inside itself';
355 is &ma, 43, 'my sub invisible inside itself (called via amper)';
356 is do ma(), 43, 'my sub invisible inside itself (called via do)';
357 }
358 44
359 }
360 ma(1);
361 sub mb { 43 }
362 my sub mb;
363 my sub mb {
364 if (shift) {
365 # ‘my sub foo{}’ creates a new pad entry, not reusing the forward
366 # declaration. Being invisible inside itself, it sees the stub.
367 eval{mb};
368 like $@, qr/^Undefined subroutine &mb called at /,
369 'my sub foo {} after forward declaration';
370 eval{&mb};
371 like $@, qr/^Undefined subroutine &mb called at /,
372 'my sub foo {} after forward declaration (amper)';
373 eval{do mb()};
374 like $@, qr/^Undefined subroutine &mb called at /,
375 'my sub foo {} after forward declaration (do)';
376 }
377 44
378 }
379 mb(1);
380 sub mb2 { 43 }
381 my sub sb2;
382 sub mb2 {
383 if (shift) {
384 package bar;
385 is mb2, 44, 'my sub visible inside itself after decl';
386 is &mb2, 44, 'my sub visible inside itself after decl (amper)';
387 is do mb2(), 44, 'my sub visible inside itself after decl (do)';
388 }
389 44
390 }
391 mb2(1);
392 my sub mb3;
393 {
394 my sub mb3 { # new pad entry
395 # The sub containing this comment is invisible inside itself.
396 # So this one here will assign to the outer pad entry:
397 sub mb3 { 47 }
398 }
399 }
400 is eval{mb3}, 47,
401 'sub foo{} applying to "my sub foo;" even inside my sub foo{}';
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402 # Same test again, but inside an anonymous sub
403 sub {
404 my sub mb4;
405 {
406 my sub mb4 {
407 sub mb4 { 47 }
408 }
409 }
410 is mb4, 47,
411 'sub foo{} applying to "my sub foo;" even inside my sub foo{}';
412 }->();
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413}
414sub mc { 43 }
415{
416 my sub mc;
417 eval{mc};
418 like $@, qr/^Undefined subroutine &mc called at /,
419 'my sub foo; makes no lex alias for existing sub';
420 eval{&mc};
421 like $@, qr/^Undefined subroutine &mc called at /,
422 'my sub foo; makes no lex alias for existing sub (amper)';
423 eval{do mc()};
424 like $@, qr/^Undefined subroutine &mc called at /,
425 'my sub foo; makes no lex alias for existing sub (do)';
426}
427package main;
428{
429 my sub me ($);
430 is prototype eval{\&me}, '$', 'my sub with proto';
431 is prototype "me", undef, 'prototype "..." ignores my subs';
432}
433{
434 my sub if() { 44 }
435 my $x = if if if;
436 is $x, 44, 'my subs override all keywords';
437 package bar;
438 my $y = if if if;
439 is $y, 44, 'my subs from other packages override all keywords';
440}
441{
64fbf0dd 442 use warnings; no warnings "experimental::lexical_subs";
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443 my $w ;
444 local $SIG{__WARN__} = sub { $w .= shift };
445 eval '#line 87 squidges
446 my sub foo;
447 my sub foo {};
448 ';
449 is $w,
450 '"my" subroutine &foo masks earlier declaration in same scope at '
451 . "squidges line 88.\n",
452 'warning for my sub masking earlier declaration';
453}
454# Test that my subs are cloned inside anonymous subs.
455sub mmake_closure {
456 my $x = shift;
457 sub {
458 my sub foo { $x }
459 foo
460 }
461}
462$sub1 = mmake_closure 48;
463$sub2 = mmake_closure 49;
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464is &$sub1, 48, 'my sub in closure (1)';
465is &$sub2, 49, 'my sub in closure (2)';
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466# Test that they are cloned in named subs.
467{
64fbf0dd 468 use warnings; no warnings "experimental::lexical_subs";
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469 my $w;
470 local $SIG{__WARN__} = sub { $w .= shift };
471 eval '#line 65 teetet
6d5c2147 472 sub mfoom {
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473 my $x = shift;
474 my sub poom { $x }
6d5c2147 475 \&poom
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476 }
477 ';
478 is $w, undef, 'my subs get no "Variable will not stay shared" messages';
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479 my $poom = mfoom(27);
480 my $poom2 = mfoom(678);
481 is $poom->(), 27, 'my subs closing over outer my var (1)';
482 is $poom2->(), 678, 'my subs closing over outer my var (2)';
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483 my $x = 43;
484 my sub aoeu;
485 for $x (765) {
486 my sub etetetet { $x }
6d5c2147 487 sub aoeu { $x }
194774c2 488 is etetetet, 765, 'my sub respects for() localisation';
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489 is aoeu, 43, 'unless it is declared outside the for loop';
490 }
491}
492# And we also need to test that multiple my subs can close over each
493# other’s entries in the parent subs pad, and that cv_clone is not con-
494# fused by that.
495sub make_anon_with_my_sub{
496 sub {
497 my sub s1;
498 my sub s2 { \&s1 }
499 sub s1 { \&s2 }
500 if (@_) { return eval { \&s1 } }
501 is eval{s1},eval{\&s2}, 'my sub in anon closure closing over sibling my sub';
502 is eval{s2},eval{\&s1}, 'my sub in anon closure closing over sibling my sub';
503 }
504}
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505
506# Test my subs inside predeclared my subs
507{
508 my sub s2;
509 sub s2 {
510 my $x = 3;
511 my sub s3 { eval '$x' }
512 s3;
513 }
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514 is s2, 3, 'my sub inside predeclared my sub';
515}
516
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517{
518 my $s = make_anon_with_my_sub;
519 &$s;
520
521 # And make sure the my subs were actually cloned.
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522 isnt make_anon_with_my_sub->(0), &$s(0),
523 'my subs in anon subs are cloned';
524 isnt &$s(0), &$s(0), 'at each invocation of the enclosing sub';
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525}
526{
527 my sub BEGIN { exit };
528 pass 'my subs are never special blocks';
529 my sub END { shift }
530 is END('jkqeudth'), jkqeudth,
531 'my sub END {shift} implies @_, not @ARGV';
532}
533{
534 my sub redef {}
64fbf0dd 535 use warnings; no warnings "experimental::lexical_subs";
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536 my $w;
537 local $SIG{__WARN__} = sub { $w .= shift };
538 eval "#line 56 pygpyf\nsub redef {}";
539 is $w, "Subroutine redef redefined at pygpyf line 56.\n",
540 "sub redefinition warnings from my subs";
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541
542 undef $w;
543 sub {
544 my sub x {};
545 sub { eval "#line 87 khaki\n\\&x" }
546 }->()();
547 is $w, "Subroutine \"&x\" is not available at khaki line 87.\n",
548 "unavailability warning during compilation of eval in closure";
549
550 undef $w;
551 no warnings 'void';
552 eval <<'->()();';
553#line 87 khaki
554 sub {
555 my sub x{}
556 sub not_lexical8 {
557 \&x
558 }
559 }
560->()();
561 is $w, "Subroutine \"&x\" is not available at khaki line 90.\n",
562 "unavailability warning during compilation of named sub in anon";
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563
564 undef $w;
565 sub not_lexical9 {
566 my sub x {};
567 format =
568@
569&x
570.
571 }
572 eval { write };
573 my($f,$l) = (__FILE__,__LINE__ - 1);
574 is $w, "Subroutine \"&x\" is not available at $f line $l.\n",
575 'unavailability warning during cloning';
576 $l -= 3;
577 is $@, "Undefined subroutine &x called at $f line $l.\n",
578 'Vivified sub is correctly named';
194774c2 579}
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580sub not_lexical10 {
581 my sub foo;
582 foo();
583 sub not_lexical11 {
584 my sub bar {
585 my $x = 'khaki car keys for the khaki car';
586 not_lexical10();
587 sub foo {
588 is $x, 'khaki car keys for the khaki car',
589 'mysubs in inner clonables use the running clone of their CvOUTSIDE'
590 }
591 }
592 bar()
593 }
594}
595not_lexical11();
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596{
597 my sub p (\@) {
598 is ref $_[0], 'ARRAY', 'my sub with proto';
599 }
600 p(my @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 $w, undef, 'no double free from constant my subs';
622}
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623$::TODO = ' ';
624like runperl(
625 switches => [ '-Mfeature=:all' ],
626 prog => 'my sub a { foo ref } a()',
627 stderr => 1
628 ),
629 qr/syntax error/,
630 'referencing a my sub after a syntax error does not crash';
631undef $::TODO;
4ded55f3 632
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633# -------------------- Interactions (and misc tests) -------------------- #
634
635is sub {
636 my sub s1;
637 my sub s2 { 3 };
638 sub s1 { state sub foo { \&s2 } foo }
639 s1
640 }->()(), 3, 'state sub inside my sub closing over my sub uncle';
641
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642{
643 my sub s2 { 3 };
644 sub not_lexical { state sub foo { \&s2 } foo }
645 is not_lexical->(), 3, 'state subs that reference my sub from outside';
646}
647
648# Test my subs inside predeclared package subs
649# This test also checks that CvOUTSIDE pointers are not mangled when the
650# inner sub’s CvOUTSIDE points to another sub.
651sub not_lexical2;
652sub not_lexical2 {
653 my $x = 23;
654 my sub bar;
655 sub not_lexical3 {
656 not_lexical2();
657 sub bar { $x }
658 };
659 bar
660}
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661is not_lexical3, 23, 'my subs inside predeclared package subs';
662
663# Test my subs inside predeclared package sub, where the lexical sub is
664# declared outside the package sub.
665# This checks that CvOUTSIDE pointers are fixed up even when the sub is
666# not declared inside the sub that its CvOUTSIDE points to.
8d88fe29 667sub not_lexical5 {
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FC
668 my sub foo;
669 sub not_lexical4;
670 sub not_lexical4 {
671 my $x = 234;
8d88fe29 672 not_lexical5();
0afba48f 673 sub foo { $x }
0afba48f 674 }
8d88fe29 675 foo
0afba48f 676}
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FC
677is not_lexical4, 234,
678 'my sub defined in predeclared pkg sub but declared outside';
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679
680undef *not_lexical6;
681{
682 my sub foo;
683 sub not_lexical6 { sub foo { } }
684 pass 'no crash when cloning a mysub declared inside an undef pack sub';
685}
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FC
686
687undef &not_lexical7;
688eval 'sub not_lexical7 { my @x }';
689{
690 my sub foo;
691 foo();
692 sub not_lexical7 {
693 state $x;
694 sub foo {
695 is ref \$x, 'SCALAR',
696 "redeffing a mysub's outside does not make it use the wrong pad"
697 }
698 }
699}