/
perly.y
1467 lines (1343 loc) · 46.9 KB
/
perly.y
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* perly.y
*
* Copyright (c) 1991-2002, 2003, 2004, 2005, 2006 Larry Wall
* Copyright (c) 2007, 2008, 2009, 2010, 2011 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* 'I see,' laughed Strider. 'I look foul and feel fair. Is that it?
* All that is gold does not glitter, not all those who wander are lost.'
*
* [p.171 of _The Lord of the Rings_, I/x: "Strider"]
*/
/*
* This file holds the grammar for the Perl language. If edited, you need
* to run regen_perly.pl, which re-creates the files perly.h, perly.tab
* and perly.act which are derived from this.
*
* The main job of this grammar is to call the various newFOO()
* functions in op.c to build a syntax tree of OP structs.
* It relies on the lexer in toke.c to do the tokenizing.
*
* Note: due to the way that the cleanup code works WRT to freeing ops on
* the parse stack, it is dangerous to assign to the $n variables within
* an action.
*/
/* Make the parser re-entrant. */
%define api.pure
%start grammar
%union {
I32 ival; /* __DEFAULT__ (marker for regen_perly.pl;
must always be 1st union member) */
char *pval;
OP *opval;
GV *gvval;
}
%token <ival> GRAMPROG GRAMEXPR GRAMBLOCK GRAMBARESTMT GRAMFULLSTMT GRAMSTMTSEQ GRAMSUBSIGNATURE
%token <ival> PERLY_AMPERSAND
%token <ival> PERLY_BRACE_OPEN
%token <ival> PERLY_BRACE_CLOSE
%token <ival> PERLY_BRACKET_OPEN
%token <ival> PERLY_BRACKET_CLOSE
%token <ival> PERLY_COMMA
%token <ival> PERLY_DOLLAR
%token <ival> PERLY_DOT
%token <ival> PERLY_EQUAL_SIGN
%token <ival> PERLY_MINUS
%token <ival> PERLY_PERCENT_SIGN
%token <ival> PERLY_PLUS
%token <ival> PERLY_SEMICOLON
%token <ival> PERLY_SLASH
%token <ival> PERLY_SNAIL
%token <ival> PERLY_STAR
%token <opval> BAREWORD METHOD FUNCMETH THING PMFUNC PRIVATEREF QWLIST
%token <opval> FUNC0OP FUNC0SUB UNIOPSUB LSTOPSUB
%token <opval> PLUGEXPR PLUGSTMT
%token <opval> LABEL
%token <ival> FORMAT SUB SIGSUB ANONSUB ANON_SIGSUB PACKAGE USE
%token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR
%token <ival> GIVEN WHEN DEFAULT
%token <ival> TRY CATCH
%token <ival> LOOPEX DOTDOT YADAYADA
%token <ival> FUNC0 FUNC1 FUNC UNIOP LSTOP
%token <ival> MULOP ADDOP
%token <ival> DOLSHARP DO HASHBRACK NOAMP
%token <ival> LOCAL MY REQUIRE
%token <ival> COLONATTR FORMLBRACK FORMRBRACK
%token <ival> SUBLEXSTART SUBLEXEND
%token <ival> DEFER
%type <ival> grammar remember mremember
%type <ival> startsub startanonsub startformsub
%type <ival> mintro
%type <opval> stmtseq fullstmt labfullstmt barestmt block mblock else
%type <opval> expr term subscripted scalar ary hsh arylen star amper sideff
%type <opval> condition
%type <opval> sliceme kvslice gelem
%type <opval> listexpr nexpr texpr iexpr mexpr mnexpr
%type <opval> optlistexpr optexpr optrepl indirob listop method
%type <opval> formname subname proto cont my_scalar my_var
%type <opval> list_of_scalars my_list_of_scalars refgen_topic formblock
%type <opval> subattrlist myattrlist myattrterm myterm
%type <opval> termbinop termunop anonymous termdo
%type <opval> termrelop relopchain termeqop eqopchain
%type <ival> sigslurpsigil
%type <opval> sigvarname sigdefault sigscalarelem sigslurpelem
%type <opval> sigelem siglist siglistornull subsigguts subsignature optsubsignature
%type <opval> subbody optsubbody sigsubbody optsigsubbody
%type <opval> formstmtseq formline formarg
%nonassoc <ival> PREC_LOW
%nonassoc LOOPEX
%left <ival> OROP
%left <ival> ANDOP
%right <ival> NOTOP
%nonassoc LSTOP LSTOPSUB
%left PERLY_COMMA
%right <ival> ASSIGNOP
%right <ival> PERLY_QUESTION_MARK PERLY_COLON
%nonassoc DOTDOT
%left <ival> OROR DORDOR
%left <ival> ANDAND
%left <ival> BITOROP
%left <ival> BITANDOP
%left <ival> CHEQOP NCEQOP
%left <ival> CHRELOP NCRELOP
%nonassoc UNIOP UNIOPSUB
%nonassoc REQUIRE
%left <ival> SHIFTOP
%left ADDOP
%left MULOP
%left <ival> MATCHOP
%right <ival> PERLY_EXCLAMATION_MARK PERLY_TILDE UMINUS REFGEN
%right <ival> POWOP
%nonassoc <ival> PREINC PREDEC POSTINC POSTDEC POSTJOIN
%left <ival> ARROW
%nonassoc <ival> PERLY_PAREN_CLOSE
%left <ival> PERLY_PAREN_OPEN
%left PERLY_BRACKET_OPEN PERLY_BRACE_OPEN
%% /* RULES */
/* Top-level choice of what kind of thing yyparse was called to parse */
grammar : GRAMPROG
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
remember stmtseq
{
newPROG(block_end($remember,$stmtseq));
PL_compiling.cop_seq = 0;
$$ = 0;
}
| GRAMEXPR
{
parser->expect = XTERM;
$<ival>$ = 0;
}
optexpr
{
PL_eval_root = $optexpr;
$$ = 0;
}
| GRAMBLOCK
{
parser->expect = XBLOCK;
$<ival>$ = 0;
}
block
{
PL_pad_reset_pending = TRUE;
PL_eval_root = $block;
$$ = 0;
yyunlex();
parser->yychar = yytoken = YYEOF;
}
| GRAMBARESTMT
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
barestmt
{
PL_pad_reset_pending = TRUE;
PL_eval_root = $barestmt;
$$ = 0;
yyunlex();
parser->yychar = yytoken = YYEOF;
}
| GRAMFULLSTMT
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
fullstmt
{
PL_pad_reset_pending = TRUE;
PL_eval_root = $fullstmt;
$$ = 0;
yyunlex();
parser->yychar = yytoken = YYEOF;
}
| GRAMSTMTSEQ
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
stmtseq
{
PL_eval_root = $stmtseq;
$$ = 0;
}
| GRAMSUBSIGNATURE
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
subsigguts
{
PL_eval_root = $subsigguts;
$$ = 0;
}
;
/* An ordinary block */
block : PERLY_BRACE_OPEN remember stmtseq PERLY_BRACE_CLOSE
{ if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
$$ = block_end($remember, $stmtseq);
}
;
/* format body */
formblock: PERLY_EQUAL_SIGN remember PERLY_SEMICOLON FORMRBRACK formstmtseq PERLY_SEMICOLON PERLY_DOT
{ if (parser->copline > (line_t)$PERLY_EQUAL_SIGN)
parser->copline = (line_t)$PERLY_EQUAL_SIGN;
$$ = block_end($remember, $formstmtseq);
}
;
remember: %empty /* start a full lexical scope */
{ $$ = block_start(TRUE);
parser->parsed_sub = 0; }
;
mblock : PERLY_BRACE_OPEN mremember stmtseq PERLY_BRACE_CLOSE
{ if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
$$ = block_end($mremember, $stmtseq);
}
;
mremember: %empty /* start a partial lexical scope */
{ $$ = block_start(FALSE);
parser->parsed_sub = 0; }
;
/* A sequence of statements in the program */
stmtseq : %empty
{ $$ = NULL; }
| stmtseq[list] fullstmt
{ $$ = op_append_list(OP_LINESEQ, $list, $fullstmt);
PL_pad_reset_pending = TRUE;
if ($list && $fullstmt)
PL_hints |= HINT_BLOCK_SCOPE;
}
;
/* A sequence of format lines */
formstmtseq: %empty
{ $$ = NULL; }
| formstmtseq[list] formline
{ $$ = op_append_list(OP_LINESEQ, $list, $formline);
PL_pad_reset_pending = TRUE;
if ($list && $formline)
PL_hints |= HINT_BLOCK_SCOPE;
}
;
/* A statement in the program, including optional labels */
fullstmt: barestmt
{
$$ = $barestmt ? newSTATEOP(0, NULL, $barestmt) : NULL;
}
| labfullstmt
{ $$ = $labfullstmt; }
;
labfullstmt: LABEL barestmt
{
SV *label = cSVOPx_sv($LABEL);
$$ = newSTATEOP(SvFLAGS(label) & SVf_UTF8,
savepv(SvPVX_const(label)), $barestmt);
op_free($LABEL);
}
| LABEL labfullstmt[list]
{
SV *label = cSVOPx_sv($LABEL);
$$ = newSTATEOP(SvFLAGS(label) & SVf_UTF8,
savepv(SvPVX_const(label)), $list);
op_free($LABEL);
}
;
/* A bare statement, lacking label and other aspects of state op */
barestmt: PLUGSTMT
{ $$ = $PLUGSTMT; }
| FORMAT startformsub formname formblock
{
CV *fmtcv = PL_compcv;
newFORM($startformsub, $formname, $formblock);
$$ = NULL;
if (CvOUTSIDE(fmtcv) && !CvEVAL(CvOUTSIDE(fmtcv))) {
pad_add_weakref(fmtcv);
}
parser->parsed_sub = 1;
}
| SUB subname startsub
/* sub declaration or definition not within scope
of 'use feature "signatures"'*/
{
init_named_cv(PL_compcv, $subname);
parser->in_my = 0;
parser->in_my_stash = NULL;
}
proto subattrlist optsubbody
{
SvREFCNT_inc_simple_void(PL_compcv);
$subname->op_type == OP_CONST
? newATTRSUB($startsub, $subname, $proto, $subattrlist, $optsubbody)
: newMYSUB($startsub, $subname, $proto, $subattrlist, $optsubbody)
;
$$ = NULL;
intro_my();
parser->parsed_sub = 1;
}
| SIGSUB subname startsub
/* sub declaration or definition under 'use feature
* "signatures"'. (Note that a signature isn't
* allowed in a declaration)
*/
{
init_named_cv(PL_compcv, $subname);
parser->in_my = 0;
parser->in_my_stash = NULL;
}
subattrlist optsigsubbody
{
SvREFCNT_inc_simple_void(PL_compcv);
$subname->op_type == OP_CONST
? newATTRSUB($startsub, $subname, NULL, $subattrlist, $optsigsubbody)
: newMYSUB( $startsub, $subname, NULL, $subattrlist, $optsigsubbody)
;
$$ = NULL;
intro_my();
parser->parsed_sub = 1;
}
| PACKAGE BAREWORD[version] BAREWORD[package] PERLY_SEMICOLON
{
package($package);
if ($version)
package_version($version);
$$ = NULL;
}
| USE startsub
{ CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ }
BAREWORD[version] BAREWORD[module] optlistexpr PERLY_SEMICOLON
{
SvREFCNT_inc_simple_void(PL_compcv);
utilize($USE, $startsub, $version, $module, $optlistexpr);
parser->parsed_sub = 1;
$$ = NULL;
}
| IF PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock else
{
$$ = block_end($remember,
newCONDOP(0, $mexpr, op_scope($mblock), $else));
parser->copline = (line_t)$IF;
}
| UNLESS PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock else
{
$$ = block_end($remember,
newCONDOP(0, $mexpr, $else, op_scope($mblock)));
parser->copline = (line_t)$UNLESS;
}
| GIVEN PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock
{
$$ = block_end($remember, newGIVENOP($mexpr, op_scope($mblock), 0));
parser->copline = (line_t)$GIVEN;
}
| WHEN PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock
{ $$ = block_end($remember, newWHENOP($mexpr, op_scope($mblock))); }
| DEFAULT block
{ $$ = newWHENOP(0, op_scope($block)); }
| WHILE PERLY_PAREN_OPEN remember texpr PERLY_PAREN_CLOSE mintro mblock cont
{
$$ = block_end($remember,
newWHILEOP(0, 1, NULL,
$texpr, $mblock, $cont, $mintro));
parser->copline = (line_t)$WHILE;
}
| UNTIL PERLY_PAREN_OPEN remember iexpr PERLY_PAREN_CLOSE mintro mblock cont
{
$$ = block_end($remember,
newWHILEOP(0, 1, NULL,
$iexpr, $mblock, $cont, $mintro));
parser->copline = (line_t)$UNTIL;
}
| FOR PERLY_PAREN_OPEN remember mnexpr[init_mnexpr] PERLY_SEMICOLON
{ parser->expect = XTERM; }
texpr PERLY_SEMICOLON
{ parser->expect = XTERM; }
mintro mnexpr[iterate_mnexpr] PERLY_PAREN_CLOSE
mblock
{
OP *initop = $init_mnexpr;
OP *forop = newWHILEOP(0, 1, NULL,
scalar($texpr), $mblock, $iterate_mnexpr, $mintro);
if (initop) {
forop = op_prepend_elem(OP_LINESEQ, initop,
op_append_elem(OP_LINESEQ,
newOP(OP_UNSTACK, OPf_SPECIAL),
forop));
}
PL_hints |= HINT_BLOCK_SCOPE;
$$ = block_end($remember, forop);
parser->copline = (line_t)$FOR;
}
| FOR MY remember my_scalar PERLY_PAREN_OPEN mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end($remember, newFOROP(0, $my_scalar, $mexpr, $mblock, $cont));
parser->copline = (line_t)$FOR;
}
| FOR MY remember PERLY_PAREN_OPEN my_list_of_scalars PERLY_PAREN_CLOSE PERLY_PAREN_OPEN mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end($remember, newFOROP(0, $my_list_of_scalars, $mexpr, $mblock, $cont));
parser->copline = (line_t)$FOR;
}
| FOR scalar PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end($remember, newFOROP(0,
op_lvalue($scalar, OP_ENTERLOOP), $mexpr, $mblock, $cont));
parser->copline = (line_t)$FOR;
}
| FOR my_refgen remember my_var
{ parser->in_my = 0; $<opval>$ = my($my_var); }[variable]
PERLY_PAREN_OPEN mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end(
$remember,
newFOROP(0,
op_lvalue(
newUNOP(OP_REFGEN, 0,
$<opval>variable),
OP_ENTERLOOP),
$mexpr, $mblock, $cont)
);
parser->copline = (line_t)$FOR;
}
| FOR REFGEN refgen_topic PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end($remember, newFOROP(
0, op_lvalue(newUNOP(OP_REFGEN, 0,
$refgen_topic),
OP_ENTERLOOP), $mexpr, $mblock, $cont));
parser->copline = (line_t)$FOR;
}
| FOR PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end($remember,
newFOROP(0, NULL, $mexpr, $mblock, $cont));
parser->copline = (line_t)$FOR;
}
| TRY mblock[try] CATCH PERLY_PAREN_OPEN
{ parser->in_my = 1; }
remember scalar
{ parser->in_my = 0; intro_my(); }
PERLY_PAREN_CLOSE mblock[catch]
{
$$ = newTRYCATCHOP(0,
$try, $scalar, block_end($remember, op_scope($catch)));
parser->copline = (line_t)$TRY;
}
| block cont
{
/* a block is a loop that happens once */
$$ = newWHILEOP(0, 1, NULL,
NULL, $block, $cont, 0);
}
| PACKAGE BAREWORD[version] BAREWORD[package] PERLY_BRACE_OPEN remember
{
package($package);
if ($version) {
package_version($version);
}
}
stmtseq PERLY_BRACE_CLOSE
{
/* a block is a loop that happens once */
$$ = newWHILEOP(0, 1, NULL,
NULL, block_end($remember, $stmtseq), NULL, 0);
if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
}
| sideff PERLY_SEMICOLON
{
$$ = $sideff;
}
| DEFER mblock
{
$$ = newDEFEROP(0, op_scope($2));
}
| YADAYADA PERLY_SEMICOLON
{
$$ = newLISTOP(OP_DIE, 0, newOP(OP_PUSHMARK, 0),
newSVOP(OP_CONST, 0, newSVpvs("Unimplemented")));
}
| PERLY_SEMICOLON
{
$$ = NULL;
parser->copline = NOLINE;
}
;
/* Format line */
formline: THING formarg
{ OP *list;
if ($formarg) {
OP *term = $formarg;
list = op_append_elem(OP_LIST, $THING, term);
}
else {
list = $THING;
}
if (parser->copline == NOLINE)
parser->copline = CopLINE(PL_curcop)-1;
else parser->copline--;
$$ = newSTATEOP(0, NULL,
op_convert_list(OP_FORMLINE, 0, list));
}
;
formarg : %empty
{ $$ = NULL; }
| FORMLBRACK stmtseq FORMRBRACK
{ $$ = op_unscope($stmtseq); }
;
condition: expr
;
/* An expression which may have a side-effect */
sideff : error
{ $$ = NULL; }
| expr[body]
{ $$ = $body; }
| expr[body] IF condition
{ $$ = newLOGOP(OP_AND, 0, $condition, $body); }
| expr[body] UNLESS condition
{ $$ = newLOGOP(OP_OR, 0, $condition, $body); }
| expr[body] WHILE condition
{ $$ = newLOOPOP(OPf_PARENS, 1, scalar($condition), $body); }
| expr[body] UNTIL iexpr
{ $$ = newLOOPOP(OPf_PARENS, 1, $iexpr, $body); }
| expr[body] FOR condition
{ $$ = newFOROP(0, NULL, $condition, $body, NULL);
parser->copline = (line_t)$FOR; }
| expr[body] WHEN condition
{ $$ = newWHENOP($condition, op_scope($body)); }
;
/* else and elsif blocks */
else : %empty
{ $$ = NULL; }
| ELSE mblock
{
($mblock)->op_flags |= OPf_PARENS;
$$ = op_scope($mblock);
}
| ELSIF PERLY_PAREN_OPEN mexpr PERLY_PAREN_CLOSE mblock else[else.recurse]
{ parser->copline = (line_t)$ELSIF;
$$ = newCONDOP(0,
newSTATEOP(OPf_SPECIAL,NULL,$mexpr),
op_scope($mblock), $[else.recurse]);
PL_hints |= HINT_BLOCK_SCOPE;
}
;
/* Continue blocks */
cont : %empty
{ $$ = NULL; }
| CONTINUE block
{ $$ = op_scope($block); }
;
/* determine whether there are any new my declarations */
mintro : %empty
{ $$ = (PL_min_intro_pending &&
PL_max_intro_pending >= PL_min_intro_pending);
intro_my(); }
/* Normal expression */
nexpr : %empty
{ $$ = NULL; }
| sideff
;
/* Boolean expression */
texpr : %empty /* NULL means true */
{ YYSTYPE tmplval;
(void)scan_num("1", &tmplval);
$$ = tmplval.opval; }
| expr
;
/* Inverted boolean expression */
iexpr : expr
{ $$ = invert(scalar($expr)); }
;
/* Expression with its own lexical scope */
mexpr : expr
{ $$ = $expr; intro_my(); }
;
mnexpr : nexpr
{ $$ = $nexpr; intro_my(); }
;
formname: BAREWORD { $$ = $BAREWORD; }
| %empty { $$ = NULL; }
;
startsub: %empty /* start a regular subroutine scope */
{ $$ = start_subparse(FALSE, 0);
SAVEFREESV(PL_compcv); }
;
startanonsub: %empty /* start an anonymous subroutine scope */
{ $$ = start_subparse(FALSE, CVf_ANON);
SAVEFREESV(PL_compcv); }
;
startformsub: %empty /* start a format subroutine scope */
{ $$ = start_subparse(TRUE, 0);
SAVEFREESV(PL_compcv); }
;
/* Name of a subroutine - must be a bareword, could be special */
subname : BAREWORD
| PRIVATEREF
;
/* Subroutine prototype */
proto : %empty
{ $$ = NULL; }
| THING
;
/* Optional list of subroutine attributes */
subattrlist: %empty
{ $$ = NULL; }
| COLONATTR THING
{ $$ = $THING; }
| COLONATTR
{ $$ = NULL; }
;
/* List of attributes for a "my" variable declaration */
myattrlist: COLONATTR THING
{ $$ = $THING; }
| COLONATTR
{ $$ = NULL; }
;
/* --------------------------------------
* subroutine signature parsing
*/
/* the '' or 'foo' part of a '$' or '@foo' etc signature variable */
sigvarname: %empty
{ parser->in_my = 0; $$ = NULL; }
| PRIVATEREF
{ parser->in_my = 0; $$ = $PRIVATEREF; }
;
sigslurpsigil:
PERLY_SNAIL
{ $$ = '@'; }
| PERLY_PERCENT_SIGN
{ $$ = '%'; }
/* @, %, @foo, %foo */
sigslurpelem: sigslurpsigil sigvarname sigdefault/* def only to catch errors */
{
I32 sigil = $sigslurpsigil;
OP *var = $sigvarname;
OP *defexpr = $sigdefault;
if (parser->sig_slurpy)
yyerror("Multiple slurpy parameters not allowed");
parser->sig_slurpy = (char)sigil;
if (defexpr)
yyerror("A slurpy parameter may not have "
"a default value");
$$ = var ? newSTATEOP(0, NULL, var) : NULL;
}
;
/* default part of sub signature scalar element: i.e. '= default_expr' */
sigdefault: %empty
{ $$ = NULL; }
| ASSIGNOP
{ $$ = newOP(OP_NULL, 0); }
| ASSIGNOP term
{ $$ = $term; }
/* subroutine signature scalar element: e.g. '$x', '$=', '$x = $default' */
sigscalarelem:
PERLY_DOLLAR sigvarname sigdefault
{
OP *var = $sigvarname;
OP *defexpr = $sigdefault;
if (parser->sig_slurpy)
yyerror("Slurpy parameter not last");
parser->sig_elems++;
if (defexpr) {
parser->sig_optelems++;
if ( defexpr->op_type == OP_NULL
&& !(defexpr->op_flags & OPf_KIDS))
{
/* handle '$=' special case */
if (var)
yyerror("Optional parameter "
"lacks default expression");
op_free(defexpr);
}
else {
/* a normal '=default' expression */
OP *defop = (OP*)alloc_LOGOP(OP_ARGDEFELEM,
defexpr,
LINKLIST(defexpr));
/* re-purpose op_targ to hold @_ index */
defop->op_targ =
(PADOFFSET)(parser->sig_elems - 1);
if (var) {
var->op_flags |= OPf_STACKED;
(void)op_sibling_splice(var,
NULL, 0, defop);
scalar(defop);
}
else
var = newUNOP(OP_NULL, 0, defop);
LINKLIST(var);
/* NB: normally the first child of a
* logop is executed before the logop,
* and it pushes a boolean result
* ready for the logop. For ARGDEFELEM,
* the op itself does the boolean
* calculation, so set the first op to
* it instead.
*/
var->op_next = defop;
defexpr->op_next = var;
}
}
else {
if (parser->sig_optelems)
yyerror("Mandatory parameter "
"follows optional parameter");
}
$$ = var ? newSTATEOP(0, NULL, var) : NULL;
}
;
/* subroutine signature element: e.g. '$x = $default' or '%h' */
sigelem: sigscalarelem
{ parser->in_my = KEY_sigvar; $$ = $sigscalarelem; }
| sigslurpelem
{ parser->in_my = KEY_sigvar; $$ = $sigslurpelem; }
;
/* list of subroutine signature elements */
siglist:
siglist[list] PERLY_COMMA
{ $$ = $list; }
| siglist[list] PERLY_COMMA sigelem[element]
{
$$ = op_append_list(OP_LINESEQ, $list, $element);
}
| sigelem[element] %prec PREC_LOW
{ $$ = $element; }
;
/* () or (....) */
siglistornull: %empty
{ $$ = NULL; }
| siglist
{ $$ = $siglist; }
/* optional subroutine signature */
optsubsignature: %empty
{ $$ = NULL; }
| subsignature
{ $$ = $subsignature; }
/* Subroutine signature */
subsignature: PERLY_PAREN_OPEN subsigguts PERLY_PAREN_CLOSE
{ $$ = $subsigguts; }
subsigguts:
{
ENTER;
SAVEIV(parser->sig_elems);
SAVEIV(parser->sig_optelems);
SAVEI8(parser->sig_slurpy);
parser->sig_elems = 0;
parser->sig_optelems = 0;
parser->sig_slurpy = 0;
parser->in_my = KEY_sigvar;
}
siglistornull
{
OP *sigops = $siglistornull;
struct op_argcheck_aux *aux;
OP *check;
if (!FEATURE_SIGNATURES_IS_ENABLED)
Perl_croak(aTHX_ "Experimental "
"subroutine signatures not enabled");
/* We shouldn't get here otherwise */
Perl_ck_warner_d(aTHX_
packWARN(WARN_EXPERIMENTAL__SIGNATURES),
"The signatures feature is experimental");
aux = (struct op_argcheck_aux*)
PerlMemShared_malloc(
sizeof(struct op_argcheck_aux));
aux->params = parser->sig_elems;
aux->opt_params = parser->sig_optelems;
aux->slurpy = parser->sig_slurpy;
check = newUNOP_AUX(OP_ARGCHECK, 0, NULL,
(UNOP_AUX_item *)aux);
sigops = op_prepend_elem(OP_LINESEQ, check, sigops);
sigops = op_prepend_elem(OP_LINESEQ,
newSTATEOP(0, NULL, NULL),
sigops);
/* a nextstate at the end handles context
* correctly for an empty sub body */
sigops = op_append_elem(OP_LINESEQ,
sigops,
newSTATEOP(0, NULL, NULL));
/* wrap the list of arg ops in a NULL aux op.
This serves two purposes. First, it makes
the arg list a separate subtree from the
body of the sub, and secondly the null op
may in future be upgraded to an OP_SIGNATURE
when implemented. For now leave it as
ex-argcheck */
$$ = newUNOP_AUX(OP_ARGCHECK, 0, sigops, NULL);
op_null($$);
parser->in_my = 0;
/* tell the toker that attrributes can follow
* this sig, but only so that the toker
* can skip through any (illegal) trailing
* attribute text then give a useful error
* message about "attributes before sig",
* rather than falling over ina mess at
* unrecognised syntax.
*/
parser->expect = XATTRBLOCK;
parser->sig_seen = TRUE;
LEAVE;
}
;
/* Optional subroutine body (for named subroutine declaration) */
optsubbody: subbody { $$ = $subbody; }
| PERLY_SEMICOLON { $$ = NULL; }
;
/* Subroutine body (without signature) */
subbody: remember PERLY_BRACE_OPEN stmtseq PERLY_BRACE_CLOSE
{
if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
$$ = block_end($remember, $stmtseq);
}
;
/* optional [ Subroutine body with optional signature ] (for named
* subroutine declaration) */
optsigsubbody: sigsubbody { $$ = $sigsubbody; }
| PERLY_SEMICOLON { $$ = NULL; }
/* Subroutine body with optional signature */
sigsubbody: remember optsubsignature PERLY_BRACE_OPEN stmtseq PERLY_BRACE_CLOSE
{
if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
$$ = block_end($remember,
op_append_list(OP_LINESEQ, $optsubsignature, $stmtseq));
}
;
/* Ordinary expressions; logical combinations */
expr : expr[lhs] ANDOP expr[rhs]
{ $$ = newLOGOP(OP_AND, 0, $lhs, $rhs); }
| expr[lhs] OROP[operator] expr[rhs]
{ $$ = newLOGOP($operator, 0, $lhs, $rhs); }
| listexpr %prec PREC_LOW
;
/* Expressions are a list of terms joined by commas */
listexpr: listexpr[list] PERLY_COMMA
{ $$ = $list; }
| listexpr[list] PERLY_COMMA term
{
OP* term = $term;
$$ = op_append_elem(OP_LIST, $list, term);
}
| term %prec PREC_LOW
;
/* List operators */
listop : LSTOP indirob listexpr /* map {...} @args or print $fh @args */
{ $$ = op_convert_list($LSTOP, OPf_STACKED,
op_prepend_elem(OP_LIST, newGVREF($LSTOP,$indirob), $listexpr) );
}
| FUNC PERLY_PAREN_OPEN indirob expr PERLY_PAREN_CLOSE /* print ($fh @args */
{ $$ = op_convert_list($FUNC, OPf_STACKED,
op_prepend_elem(OP_LIST, newGVREF($FUNC,$indirob), $expr) );
}
| term ARROW method PERLY_PAREN_OPEN optexpr PERLY_PAREN_CLOSE /* $foo->bar(list) */
{ $$ = op_convert_list(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST,
op_prepend_elem(OP_LIST, scalar($term), $optexpr),
newMETHOP(OP_METHOD, 0, $method)));
}
| term ARROW method /* $foo->bar */
{ $$ = op_convert_list(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST, scalar($term),
newMETHOP(OP_METHOD, 0, $method)));
}
| METHOD indirob optlistexpr /* new Class @args */
{ $$ = op_convert_list(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST,
op_prepend_elem(OP_LIST, $indirob, $optlistexpr),
newMETHOP(OP_METHOD, 0, $METHOD)));
}
| FUNCMETH indirob PERLY_PAREN_OPEN optexpr PERLY_PAREN_CLOSE /* method $object (@args) */
{ $$ = op_convert_list(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST,
op_prepend_elem(OP_LIST, $indirob, $optexpr),
newMETHOP(OP_METHOD, 0, $FUNCMETH)));
}
| LSTOP optlistexpr /* print @args */
{ $$ = op_convert_list($LSTOP, 0, $optlistexpr); }
| FUNC PERLY_PAREN_OPEN optexpr PERLY_PAREN_CLOSE /* print (@args) */
{ $$ = op_convert_list($FUNC, 0, $optexpr); }
| FUNC SUBLEXSTART optexpr SUBLEXEND /* uc($arg) from "\U..." */
{ $$ = op_convert_list($FUNC, 0, $optexpr); }
| LSTOPSUB startanonsub block /* sub f(&@); f { foo } ... */
{ SvREFCNT_inc_simple_void(PL_compcv);
$<opval>$ = newANONATTRSUB($startanonsub, 0, NULL, $block); }[anonattrsub]
optlistexpr %prec LSTOP /* ... @bar */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST,
op_prepend_elem(OP_LIST, $<opval>anonattrsub, $optlistexpr), $LSTOPSUB));
}
;
/* Names of methods. May use $object->$methodname */
method : METHOD
| scalar
;
/* Some kind of subscripted expression */
subscripted: gelem PERLY_BRACE_OPEN expr PERLY_SEMICOLON PERLY_BRACE_CLOSE /* *main::{something} */
/* In this and all the hash accessors, PERLY_SEMICOLON is
* provided by the tokeniser */
{ $$ = newBINOP(OP_GELEM, 0, $gelem, scalar($expr)); }
| scalar[array] PERLY_BRACKET_OPEN expr PERLY_BRACKET_CLOSE /* $array[$element] */
{ $$ = newBINOP(OP_AELEM, 0, oopsAV($array), scalar($expr));
}
| term[array_reference] ARROW PERLY_BRACKET_OPEN expr PERLY_BRACKET_CLOSE /* somearef->[$element] */