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a0d0e21e 1/* perly.y
a687059c 2 *
f05e27e5 3 * Copyright (c) 1991-2002, 2003, 2004, 2005, 2006 Larry Wall
2eee27d7 4 * Copyright (c) 2007, 2008, 2009, 2010, 2011 by Larry Wall and others
a687059c 5 *
9ef589d8
LW
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8d063cd8 8 *
a0d0e21e
LW
9 */
10
11/*
12 * 'I see,' laughed Strider. 'I look foul and feel fair. Is that it?
4ac71550 13 * All that is gold does not glitter, not all those who wander are lost.'
f05e27e5 14 *
4ac71550
TC
15 * [p.171 of _The Lord of the Rings_, I/x: "Strider"]
16 */
17
18/*
f05e27e5 19 * This file holds the grammar for the Perl language. If edited, you need
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DM
20 * to run regen_perly.pl, which re-creates the files perly.h, perly.tab
21 * and perly.act which are derived from this.
22 *
23 * The main job of of this grammar is to call the various newFOO()
24 * functions in op.c to build a syntax tree of OP structs.
61296642 25 * It relies on the lexer in toke.c to do the tokenizing.
29522234
DM
26 *
27 * Note: due to the way that the cleanup code works WRT to freeing ops on
28 * the parse stack, it is dangerous to assign to the $n variables within
29 * an action.
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DM
30 */
31
0de566d7 32/* Make the parser re-entrant. */
8d063cd8 33
f39ff1f3 34%pure-parser
8d063cd8 35
28ac2b49 36%start grammar
9d116dd7 37
8d063cd8 38%union {
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DM
39 I32 ival; /* __DEFAULT__ (marker for regen_perly.pl;
40 must always be 1st union member) */
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LW
41 char *pval;
42 OP *opval;
43 GV *gvval;
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LW
44}
45
78cdf107 46%token <ival> GRAMPROG GRAMEXPR GRAMBLOCK GRAMBARESTMT GRAMFULLSTMT GRAMSTMTSEQ
28ac2b49 47
f10ebf6c 48%token <ival> '{' '}' '[' ']' '-' '+' '@' '%' '&' '=' '.'
f0fcb552 49
185c2e96 50%token <opval> BAREWORD METHOD FUNCMETH THING PMFUNC PRIVATEREF QWLIST
7eb971ee 51%token <opval> FUNC0OP FUNC0SUB UNIOPSUB LSTOPSUB
88e1f1a2 52%token <opval> PLUGEXPR PLUGSTMT
b5bbe64a
JH
53%token <pval> LABEL
54%token <ival> FORMAT SUB ANONSUB PACKAGE USE
55%token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR
56%token <ival> GIVEN WHEN DEFAULT
57%token <ival> LOOPEX DOTDOT YADAYADA
58%token <ival> FUNC0 FUNC1 FUNC UNIOP LSTOP
59%token <ival> RELOP EQOP MULOP ADDOP
60%token <ival> DOLSHARP DO HASHBRACK NOAMP
61%token <ival> LOCAL MY REQUIRE
62%token <ival> COLONATTR FORMLBRACK FORMRBRACK
f05e27e5 63
727a8fe5 64%type <ival> grammar remember mremember
f05e27e5 65%type <ival> startsub startanonsub startformsub
b5bbe64a 66
b5a64814 67%type <ival> mintro
f05e27e5 68
8e720305 69%type <opval> stmtseq fullstmt labfullstmt barestmt block mblock else
fad39ff1 70%type <opval> expr term subscripted scalar ary hsh arylen star amper sideff
76eba8ab 71%type <opval> sliceme kvslice gelem
08b3e84f 72%type <opval> listexpr nexpr texpr iexpr mexpr mnexpr
9b6b7be8 73%type <opval> optlistexpr optexpr optrepl indirob listop method
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FC
74%type <opval> formname subname proto optsubbody cont my_scalar my_var
75%type <opval> refgen_topic formblock
f05e27e5 76%type <opval> subattrlist myattrlist myattrterm myterm
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DM
77%type <opval> termbinop termunop anonymous termdo
78%type <ival> sigslurpsigil
79%type <opval> sigvarname sigdefault sigscalarelem sigslurpelem
80%type <opval> sigelem siglist siglistornull subsignature
705fe0e5 81%type <opval> formstmtseq formline formarg
79072805 82
b5bbe64a 83%nonassoc <ival> PREC_LOW
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SM
84%nonassoc LOOPEX
85
b5bbe64a
JH
86%left <ival> OROP DOROP
87%left <ival> ANDOP
88%right <ival> NOTOP
36477c24 89%nonassoc LSTOP LSTOPSUB
b5bbe64a
JH
90%left <ival> ','
91%right <ival> ASSIGNOP
92%right <ival> '?' ':'
be25f609 93%nonassoc DOTDOT YADAYADA
b5bbe64a
JH
94%left <ival> OROR DORDOR
95%left <ival> ANDAND
96%left <ival> BITOROP
97%left <ival> BITANDOP
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LW
98%nonassoc EQOP
99%nonassoc RELOP
36477c24 100%nonassoc UNIOP UNIOPSUB
20515881 101%nonassoc REQUIRE
b5bbe64a 102%left <ival> SHIFTOP
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LW
103%left ADDOP
104%left MULOP
b5bbe64a
JH
105%left <ival> MATCHOP
106%right <ival> '!' '~' UMINUS REFGEN
107%right <ival> POWOP
108%nonassoc <ival> PREINC PREDEC POSTINC POSTDEC POSTJOIN
109%left <ival> ARROW
110%nonassoc <ival> ')'
111%left <ival> '('
fad39ff1 112%left '[' '{'
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113
114%% /* RULES */
115
28ac2b49 116/* Top-level choice of what kind of thing yyparse was called to parse */
727a8fe5
Z
117grammar : GRAMPROG
118 {
624fa8bd 119 parser->expect = XSTATE;
727a8fe5
Z
120 }
121 remember stmtseq
122 {
123 newPROG(block_end($3,$4));
8635e3c2 124 PL_compiling.cop_seq = 0;
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125 $$ = 0;
126 }
78cdf107
Z
127 | GRAMEXPR
128 {
129 parser->expect = XTERM;
130 }
09b1cffe 131 optexpr
78cdf107
Z
132 {
133 PL_eval_root = $3;
134 $$ = 0;
135 }
e53d8f76
Z
136 | GRAMBLOCK
137 {
138 parser->expect = XBLOCK;
139 }
140 block
141 {
5f211341 142 PL_pad_reset_pending = TRUE;
8359b381
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143 PL_eval_root = $3;
144 $$ = 0;
145 yyunlex();
146 parser->yychar = YYEOF;
147 }
148 | GRAMBARESTMT
149 {
150 parser->expect = XSTATE;
151 }
152 barestmt
153 {
154 PL_pad_reset_pending = TRUE;
e53d8f76
Z
155 PL_eval_root = $3;
156 $$ = 0;
157 yyunlex();
158 parser->yychar = YYEOF;
159 }
9eb5c532 160 | GRAMFULLSTMT
28ac2b49 161 {
9eb5c532
Z
162 parser->expect = XSTATE;
163 }
164 fullstmt
165 {
5f211341 166 PL_pad_reset_pending = TRUE;
9eb5c532 167 PL_eval_root = $3;
28ac2b49
Z
168 $$ = 0;
169 yyunlex();
170 parser->yychar = YYEOF;
171 }
07ffcb73
Z
172 | GRAMSTMTSEQ
173 {
174 parser->expect = XSTATE;
175 }
5f211341 176 stmtseq
07ffcb73
Z
177 {
178 PL_eval_root = $3;
179 $$ = 0;
180 }
181 ;
182
891be019 183/* An ordinary block */
5f211341 184block : '{' remember stmtseq '}'
624fa8bd
FC
185 { if (parser->copline > (line_t)$1)
186 parser->copline = (line_t)$1;
f05e27e5 187 $$ = block_end($2, $3);
f05e27e5 188 }
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LW
189 ;
190
7c70caa5 191/* format body */
705fe0e5 192formblock: '=' remember ';' FORMRBRACK formstmtseq ';' '.'
624fa8bd
FC
193 { if (parser->copline > (line_t)$1)
194 parser->copline = (line_t)$1;
705fe0e5 195 $$ = block_end($2, $5);
7c70caa5
FC
196 }
197 ;
198
55497cff 199remember: /* NULL */ /* start a full lexical scope */
34b54951
FC
200 { $$ = block_start(TRUE);
201 parser->parsed_sub = 0; }
55497cff
PP
202 ;
203
5f211341 204mblock : '{' mremember stmtseq '}'
624fa8bd
FC
205 { if (parser->copline > (line_t)$1)
206 parser->copline = (line_t)$1;
f05e27e5 207 $$ = block_end($2, $3);
f05e27e5 208 }
55497cff
PP
209 ;
210
211mremember: /* NULL */ /* start a partial lexical scope */
34b54951
FC
212 { $$ = block_start(FALSE);
213 parser->parsed_sub = 0; }
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LW
214 ;
215
eae48c89 216/* A sequence of statements in the program */
5f211341 217stmtseq : /* NULL */
bcabcc50 218 { $$ = (OP*)NULL; }
5f211341 219 | stmtseq fullstmt
2fcb4757 220 { $$ = op_append_list(OP_LINESEQ, $1, $2);
3280af22 221 PL_pad_reset_pending = TRUE;
503de470
DM
222 if ($1 && $2)
223 PL_hints |= HINT_BLOCK_SCOPE;
224 }
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LW
225 ;
226
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FC
227/* A sequence of format lines */
228formstmtseq: /* NULL */
229 { $$ = (OP*)NULL; }
230 | formstmtseq formline
231 { $$ = op_append_list(OP_LINESEQ, $1, $2);
232 PL_pad_reset_pending = TRUE;
233 if ($1 && $2)
234 PL_hints |= HINT_BLOCK_SCOPE;
235 }
236 ;
237
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Z
238/* A statement in the program, including optional labels */
239fullstmt: barestmt
eae48c89 240 {
b5bbe64a 241 $$ = $1 ? newSTATEOP(0, NULL, $1) : NULL;
eae48c89 242 }
8e720305
Z
243 | labfullstmt
244 { $$ = $1; }
245 ;
246
247labfullstmt: LABEL barestmt
248 {
b5bbe64a 249 $$ = newSTATEOP(SVf_UTF8 * $1[strlen($1)+1], $1, $2);
8e720305
Z
250 }
251 | LABEL labfullstmt
252 {
b5bbe64a 253 $$ = newSTATEOP(SVf_UTF8 * $1[strlen($1)+1], $1, $2);
8e720305 254 }
eae48c89
Z
255 ;
256
257/* A bare statement, lacking label and other aspects of state op */
258barestmt: PLUGSTMT
0d863452 259 { $$ = $1; }
7c70caa5 260 | FORMAT startformsub formname formblock
f05e27e5 261 {
eae48c89 262 CV *fmtcv = PL_compcv;
eae48c89
Z
263 newFORM($2, $3, $4);
264 $$ = (OP*)NULL;
4a273b91 265 if (CvOUTSIDE(fmtcv) && !CvEVAL(CvOUTSIDE(fmtcv))) {
74a9453a 266 pad_add_weakref(fmtcv);
f05e27e5 267 }
8b9fb2f9 268 parser->parsed_sub = 1;
eae48c89 269 }
50278755
FC
270 | SUB subname startsub
271 {
272 if ($2->op_type == OP_CONST) {
273 const char *const name =
274 SvPV_nolen_const(((SVOP*)$2)->op_sv);
275 if (strEQ(name, "BEGIN") || strEQ(name, "END")
764212cf
FC
276 || strEQ(name, "INIT") || strEQ(name, "CHECK")
277 || strEQ(name, "UNITCHECK"))
278 CvSPECIAL_on(PL_compcv);
50278755 279 }
e07561e6
FC
280 else
281 /* State subs inside anonymous subs need to be
282 clonable themselves. */
6d5c2147
FC
283 if (CvANON(CvOUTSIDE(PL_compcv))
284 || CvCLONE(CvOUTSIDE(PL_compcv))
285 || !PadnameIsSTATE(PadlistNAMESARRAY(CvPADLIST(
286 CvOUTSIDE(PL_compcv)
287 ))[$2->op_targ]))
e07561e6 288 CvCLONE_on(PL_compcv);
624fa8bd
FC
289 parser->in_my = 0;
290 parser->in_my_stash = NULL;
764212cf 291 }
30d9c59b 292 proto subattrlist optsubbody
eae48c89
Z
293 {
294 SvREFCNT_inc_simple_void(PL_compcv);
50278755
FC
295 $2->op_type == OP_CONST
296 ? newATTRSUB($3, $2, $5, $6, $7)
297 : newMYSUB($3, $2, $5, $6, $7)
50278755 298 ;
eae48c89 299 $$ = (OP*)NULL;
764212cf 300 intro_my();
34b54951 301 parser->parsed_sub = 1;
f05e27e5 302 }
abcf453d
PM
303 | SUB subname startsub
304 {
305 if ($2->op_type == OP_CONST) {
306 const char *const name =
307 SvPV_nolen_const(((SVOP*)$2)->op_sv);
308 if (strEQ(name, "BEGIN") || strEQ(name, "END")
309 || strEQ(name, "INIT") || strEQ(name, "CHECK")
310 || strEQ(name, "UNITCHECK"))
311 CvSPECIAL_on(PL_compcv);
312 }
313 else
314 /* State subs inside anonymous subs need to be
315 clonable themselves. */
316 if (CvANON(CvOUTSIDE(PL_compcv))
317 || CvCLONE(CvOUTSIDE(PL_compcv))
318 || !PadnameIsSTATE(PadlistNAMESARRAY(CvPADLIST(
319 CvOUTSIDE(PL_compcv)
320 ))[$2->op_targ]))
321 CvCLONE_on(PL_compcv);
322 parser->in_my = 0;
323 parser->in_my_stash = NULL;
324 }
325 remember subsignature subattrlist '{' stmtseq '}'
326 {
327 OP *body;
328 if (parser->copline > (line_t)$8)
329 parser->copline = (line_t)$8;
330 body = block_end($5,
331 op_append_list(OP_LINESEQ, $6, $9));
332
333 SvREFCNT_inc_simple_void(PL_compcv);
334 $2->op_type == OP_CONST
335 ? newATTRSUB($3, $2, NULL, $7, body)
336 : newMYSUB($3, $2, NULL, $7, body)
337 ;
338 $$ = (OP*)NULL;
339 intro_my();
340 parser->parsed_sub = 1;
341 }
185c2e96 342 | PACKAGE BAREWORD BAREWORD ';'
5f211341 343 {
eae48c89
Z
344 package($3);
345 if ($2)
346 package_version($2);
347 $$ = (OP*)NULL;
eae48c89
Z
348 }
349 | USE startsub
350 { CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ }
185c2e96 351 BAREWORD BAREWORD optlistexpr ';'
eae48c89
Z
352 {
353 SvREFCNT_inc_simple_void(PL_compcv);
b5bbe64a 354 utilize($1, $2, $4, $5, $6);
34b54951 355 parser->parsed_sub = 1;
eae48c89 356 $$ = (OP*)NULL;
eae48c89 357 }
417a992d 358 | IF '(' remember mexpr ')' mblock else
eae48c89 359 {
3ad73efd
Z
360 $$ = block_end($3,
361 newCONDOP(0, $4, op_scope($6), $7));
624fa8bd 362 parser->copline = (line_t)$1;
eae48c89 363 }
08b3e84f 364 | UNLESS '(' remember mexpr ')' mblock else
eae48c89 365 {
3ad73efd 366 $$ = block_end($3,
08b3e84f 367 newCONDOP(0, $4, $7, op_scope($6)));
624fa8bd 368 parser->copline = (line_t)$1;
eae48c89 369 }
b5a64814 370 | GIVEN '(' remember mexpr ')' mblock
eae48c89 371 {
5d051ee0 372 $$ = block_end($3, newGIVENOP($4, op_scope($6), 0));
624fa8bd 373 parser->copline = (line_t)$1;
eae48c89 374 }
417a992d 375 | WHEN '(' remember mexpr ')' mblock
3ad73efd 376 { $$ = block_end($3, newWHENOP($4, op_scope($6))); }
eae48c89 377 | DEFAULT block
3ad73efd 378 { $$ = newWHENOP(0, op_scope($2)); }
417a992d 379 | WHILE '(' remember texpr ')' mintro mblock cont
eae48c89
Z
380 {
381 $$ = block_end($3,
382 newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
94bf0465 383 $4, $7, $8, $6));
624fa8bd 384 parser->copline = (line_t)$1;
eae48c89 385 }
417a992d 386 | UNTIL '(' remember iexpr ')' mintro mblock cont
eae48c89
Z
387 {
388 $$ = block_end($3,
94bf0465
Z
389 newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
390 $4, $7, $8, $6));
624fa8bd 391 parser->copline = (line_t)$1;
eae48c89 392 }
2d0e3c96
FC
393 | FOR '(' remember mnexpr ';'
394 { parser->expect = XTERM; }
395 texpr ';'
396 { parser->expect = XTERM; }
397 mintro mnexpr ')'
eae48c89
Z
398 mblock
399 {
b5bbe64a 400 OP *initop = $4;
eae48c89 401 OP *forop = newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
2d0e3c96 402 scalar($7), $13, $11, $10);
eae48c89
Z
403 if (initop) {
404 forop = op_prepend_elem(OP_LINESEQ, initop,
405 op_append_elem(OP_LINESEQ,
406 newOP(OP_UNSTACK, OPf_SPECIAL),
407 forop));
5f211341 408 }
0f602692 409 PL_hints |= HINT_BLOCK_SCOPE;
eae48c89 410 $$ = block_end($3, forop);
624fa8bd 411 parser->copline = (line_t)$1;
eae48c89 412 }
417a992d 413 | FOR MY remember my_scalar '(' mexpr ')' mblock cont
eae48c89 414 {
94bf0465 415 $$ = block_end($3, newFOROP(0, $4, $6, $8, $9));
624fa8bd 416 parser->copline = (line_t)$1;
eae48c89 417 }
417a992d 418 | FOR scalar '(' remember mexpr ')' mblock cont
eae48c89 419 {
94bf0465 420 $$ = block_end($4, newFOROP(0,
3ad73efd 421 op_lvalue($2, OP_ENTERLOOP), $5, $7, $8));
624fa8bd 422 parser->copline = (line_t)$1;
eae48c89 423 }
e118fea3
FC
424 | FOR my_refgen remember my_var
425 { parser->in_my = 0; $<opval>$ = my($4); }
d39c26a6
FC
426 '(' mexpr ')' mblock cont
427 {
428 $$ = block_end(
e118fea3 429 $3,
d39c26a6
FC
430 newFOROP(0,
431 op_lvalue(
432 newUNOP(OP_REFGEN, 0,
e118fea3 433 $<opval>5),
d39c26a6 434 OP_ENTERLOOP),
e118fea3 435 $7, $9, $10)
d39c26a6
FC
436 );
437 parser->copline = (line_t)$1;
438 }
439 | FOR REFGEN refgen_topic '(' remember mexpr ')' mblock cont
440 {
441 $$ = block_end($5, newFOROP(
442 0, op_lvalue(newUNOP(OP_REFGEN, 0,
96801525 443 $3),
d39c26a6
FC
444 OP_ENTERLOOP), $6, $8, $9));
445 parser->copline = (line_t)$1;
446 }
417a992d 447 | FOR '(' remember mexpr ')' mblock cont
eae48c89
Z
448 {
449 $$ = block_end($3,
94bf0465 450 newFOROP(0, (OP*)NULL, $4, $6, $7));
624fa8bd 451 parser->copline = (line_t)$1;
eae48c89
Z
452 }
453 | block cont
454 {
455 /* a block is a loop that happens once */
456 $$ = newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
94bf0465 457 (OP*)NULL, $1, $2, 0);
eae48c89 458 }
185c2e96 459 | PACKAGE BAREWORD BAREWORD '{' remember
eae48c89 460 {
eae48c89 461 package($3);
eae48c89 462 if ($2) {
eae48c89 463 package_version($2);
eae48c89
Z
464 }
465 }
466 stmtseq '}'
467 {
468 /* a block is a loop that happens once */
94bf0465 469 $$ = newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
eae48c89 470 (OP*)NULL, block_end($5, $7), (OP*)NULL, 0);
624fa8bd
FC
471 if (parser->copline > (line_t)$4)
472 parser->copline = (line_t)$4;
eae48c89
Z
473 }
474 | sideff ';'
475 {
eae48c89 476 $$ = $1;
eae48c89
Z
477 }
478 | ';'
479 {
b5bbe64a 480 $$ = (OP*)NULL;
624fa8bd 481 parser->copline = NOLINE;
5f211341 482 }
8d063cd8
LW
483 ;
484
705fe0e5
FC
485/* Format line */
486formline: THING formarg
487 { OP *list;
488 if ($2) {
489 OP *term = $2;
705fe0e5
FC
490 list = op_append_elem(OP_LIST, $1, term);
491 }
492 else {
705fe0e5 493 list = $1;
705fe0e5 494 }
624fa8bd
FC
495 if (parser->copline == NOLINE)
496 parser->copline = CopLINE(PL_curcop)-1;
497 else parser->copline--;
705fe0e5 498 $$ = newSTATEOP(0, NULL,
03d05f6e 499 op_convert_list(OP_FORMLINE, 0, list));
705fe0e5
FC
500 }
501 ;
502
503formarg : /* NULL */
504 { $$ = NULL; }
505 | FORMLBRACK stmtseq FORMRBRACK
506 { $$ = op_unscope($2); }
507 ;
508
891be019 509/* An expression which may have a side-effect */
a687059c 510sideff : error
bcabcc50 511 { $$ = (OP*)NULL; }
a687059c 512 | expr
79072805 513 { $$ = $1; }
a687059c 514 | expr IF expr
b5bbe64a 515 { $$ = newLOGOP(OP_AND, 0, $3, $1); }
a687059c 516 | expr UNLESS expr
b5bbe64a 517 { $$ = newLOGOP(OP_OR, 0, $3, $1); }
a687059c 518 | expr WHILE expr
b5bbe64a 519 { $$ = newLOOPOP(OPf_PARENS, 1, scalar($3), $1); }
55497cff 520 | expr UNTIL iexpr
b5bbe64a 521 { $$ = newLOOPOP(OPf_PARENS, 1, $3, $1); }
ecca16b0 522 | expr FOR expr
94bf0465 523 { $$ = newFOROP(0, (OP*)NULL, $3, $1, (OP*)NULL);
624fa8bd 524 parser->copline = (line_t)$2; }
f20dcd76 525 | expr WHEN expr
3ad73efd 526 { $$ = newWHENOP($3, op_scope($1)); }
79072805
LW
527 ;
528
891be019 529/* else and elsif blocks */
79072805 530else : /* NULL */
bcabcc50 531 { $$ = (OP*)NULL; }
55497cff 532 | ELSE mblock
3ad73efd
Z
533 {
534 ($2)->op_flags |= OPf_PARENS;
535 $$ = op_scope($2);
f05e27e5 536 }
417a992d 537 | ELSIF '(' mexpr ')' mblock else
624fa8bd 538 { parser->copline = (line_t)$1;
3ad73efd
Z
539 $$ = newCONDOP(0,
540 newSTATEOP(OPf_SPECIAL,NULL,$3),
541 op_scope($5), $6);
542 PL_hints |= HINT_BLOCK_SCOPE;
f05e27e5 543 }
79072805
LW
544 ;
545
891be019 546/* Continue blocks */
79072805 547cont : /* NULL */
bcabcc50 548 { $$ = (OP*)NULL; }
79072805 549 | CONTINUE block
b5bbe64a 550 { $$ = op_scope($2); }
79072805
LW
551 ;
552
a034e688
DM
553/* determine whether there are any new my declarations */
554mintro : /* NULL */
555 { $$ = (PL_min_intro_pending &&
556 PL_max_intro_pending >= PL_min_intro_pending);
557 intro_my(); }
558
891be019 559/* Normal expression */
8d063cd8 560nexpr : /* NULL */
bcabcc50 561 { $$ = (OP*)NULL; }
8d063cd8
LW
562 | sideff
563 ;
564
891be019 565/* Boolean expression */
8d063cd8 566texpr : /* NULL means true */
f05e27e5
DM
567 { YYSTYPE tmplval;
568 (void)scan_num("1", &tmplval);
569 $$ = tmplval.opval; }
8d063cd8
LW
570 | expr
571 ;
572
891be019 573/* Inverted boolean expression */
55497cff
PP
574iexpr : expr
575 { $$ = invert(scalar($1)); }
576 ;
577
891be019 578/* Expression with its own lexical scope */
55497cff 579mexpr : expr
bbce6d69
PP
580 { $$ = $1; intro_my(); }
581 ;
582
583mnexpr : nexpr
584 { $$ = $1; intro_my(); }
55497cff
PP
585 ;
586
185c2e96 587formname: BAREWORD { $$ = $1; }
bcabcc50 588 | /* NULL */ { $$ = (OP*)NULL; }
8d063cd8
LW
589 ;
590
fa83b5b6 591startsub: /* NULL */ /* start a regular subroutine scope */
a8ff2fa6
DM
592 { $$ = start_subparse(FALSE, 0);
593 SAVEFREESV(PL_compcv); }
f05e27e5 594
28757baa
PP
595 ;
596
597startanonsub: /* NULL */ /* start an anonymous subroutine scope */
a8ff2fa6
DM
598 { $$ = start_subparse(FALSE, CVf_ANON);
599 SAVEFREESV(PL_compcv); }
28757baa
PP
600 ;
601
44a8e56a 602startformsub: /* NULL */ /* start a format subroutine scope */
a8ff2fa6
DM
603 { $$ = start_subparse(TRUE, 0);
604 SAVEFREESV(PL_compcv); }
44a8e56a
PP
605 ;
606
891be019 607/* Name of a subroutine - must be a bareword, could be special */
185c2e96 608subname : BAREWORD
4210d3f1 609 | PRIVATEREF
a0d0e21e
LW
610 ;
611
891be019 612/* Subroutine prototype */
4633a7c4 613proto : /* NULL */
bcabcc50 614 { $$ = (OP*)NULL; }
4633a7c4
LW
615 | THING
616 ;
28757baa 617
891be019 618/* Optional list of subroutine attributes */
09bef843 619subattrlist: /* NULL */
bcabcc50 620 { $$ = (OP*)NULL; }
09bef843 621 | COLONATTR THING
b5bbe64a 622 { $$ = $2; }
09bef843 623 | COLONATTR
b5bbe64a 624 { $$ = (OP*)NULL; }
09bef843
SB
625 ;
626
891be019 627/* List of attributes for a "my" variable declaration */
09bef843 628myattrlist: COLONATTR THING
b5bbe64a 629 { $$ = $2; }
09bef843 630 | COLONATTR
b5bbe64a 631 { $$ = (OP*)NULL; }
09bef843
SB
632 ;
633
abcf453d 634
d3d9da4a
DM
635
636/* --------------------------------------
637 * subroutine signature parsing
638 */
639
640/* the '' or 'foo' part of a '$' or '@foo' etc signature variable */
641sigvarname: /* NULL */
642 { $$ = (OP*)NULL; }
643 | PRIVATEREF
4fa06845 644 { $$ = $1; }
d3d9da4a
DM
645 ;
646
647sigslurpsigil:
648 '@'
649 { $$ = '@'; }
650 | '%'
651 { $$ = '%'; }
652
653/* @, %, @foo, %foo */
654sigslurpelem: sigslurpsigil sigvarname sigdefault/* def only to catch errors */
655 {
4fa06845
DM
656 I32 sigil = $1;
657 OP *var = $2;
d3d9da4a 658 OP *defexpr = $3;
d3d9da4a
DM
659
660 if (PL_parser->sig_slurpy)
661 yyerror("Multiple slurpy parameters not allowed");
5b9ec8a2 662 PL_parser->sig_slurpy = (char)sigil;
d3d9da4a
DM
663
664 if (defexpr)
bb6b75cd 665 yyerror("A slurpy parameter may not have "
d3d9da4a
DM
666 "a default value");
667
4fa06845 668 $$ = var ? newSTATEOP(0, NULL, var) : (OP*)NULL;
d3d9da4a
DM
669 }
670 ;
671
672/* default part of sub signature scalar element: i.e. '= default_expr' */
673sigdefault: /* NULL */
674 { $$ = (OP*)NULL; }
675 | ASSIGNOP
676 { $$ = newOP(OP_NULL, 0); }
677 | ASSIGNOP term
678 { $$ = $2; }
679
680
681/* subroutine signature scalar element: e.g. '$x', '$=', '$x = $default' */
682sigscalarelem:
683 '$' sigvarname sigdefault
684 {
685 OP *var = $2;
686 OP *defexpr = $3;
d3d9da4a
DM
687
688 if (PL_parser->sig_slurpy)
689 yyerror("Slurpy parameter not last");
690
691 PL_parser->sig_elems++;
692
d3d9da4a
DM
693 if (defexpr) {
694 PL_parser->sig_optelems++;
4fa06845
DM
695
696 if ( defexpr->op_type == OP_NULL
d3d9da4a
DM
697 && !(defexpr->op_flags & OPf_KIDS))
698 {
4fa06845
DM
699 /* handle '$=' special case */
700 if (var)
701 yyerror("Optional parameter "
702 "lacks default expression");
d3d9da4a
DM
703 op_free(defexpr);
704 }
4fa06845
DM
705 else {
706 /* a normal '=default' expression */
707 OP *defop = (OP*)alloc_LOGOP(OP_ARGDEFELEM,
708 defexpr,
709 LINKLIST(defexpr));
710 /* re-purpose op_targ to hold @_ index */
6daeaaa3
DM
711 defop->op_targ =
712 (PADOFFSET)(PL_parser->sig_elems - 1);
4fa06845
DM
713
714 if (var) {
715 var->op_flags |= OPf_STACKED;
716 (void)op_sibling_splice(var,
717 NULL, 0, defop);
718 scalar(defop);
719 }
720 else
721 var = newUNOP(OP_NULL, 0, defop);
722
723 LINKLIST(var);
724 /* NB: normally the first child of a
725 * logop is executed before the logop,
726 * and it pushes a boolean result
727 * ready for the logop. For ARGDEFELEM,
728 * the op itself does the boolean
729 * calculation, so set the first op to
730 * it instead.
731 */
732 var->op_next = defop;
733 defexpr->op_next = var;
d3d9da4a
DM
734 }
735 }
736 else {
737 if (PL_parser->sig_optelems)
738 yyerror("Mandatory parameter "
739 "follows optional parameter");
d3d9da4a
DM
740 }
741
4fa06845 742 $$ = var ? newSTATEOP(0, NULL, var) : (OP*)NULL;
d3d9da4a
DM
743 }
744 ;
745
746
747/* subroutine signature element: e.g. '$x = $default' or '%h' */
748sigelem: sigscalarelem
749 { parser->expect = XSIGVAR; $$ = $1; }
750 | sigslurpelem
751 { parser->expect = XSIGVAR; $$ = $1; }
752 ;
753
754/* list of subroutine signature elements */
755siglist:
756 siglist ','
757 { $$ = $1; }
758 | siglist ',' sigelem
30d9c59b 759 {
d3d9da4a 760 $$ = op_append_list(OP_LINESEQ, $1, $3);
30d9c59b 761 }
d3d9da4a
DM
762 | sigelem %prec PREC_LOW
763 { $$ = $1; }
30d9c59b
Z
764 ;
765
d3d9da4a
DM
766/* () or (....) */
767siglistornull: /* NULL */
768 { $$ = (OP*)NULL; }
769 | siglist
770 { $$ = $1; }
771
772/* Subroutine signature */
773subsignature: '('
774 {
775 ENTER;
6daeaaa3
DM
776 SAVEIV(PL_parser->sig_elems);
777 SAVEIV(PL_parser->sig_optelems);
d3d9da4a
DM
778 SAVEI8(PL_parser->sig_slurpy);
779 PL_parser->sig_elems = 0;
780 PL_parser->sig_optelems = 0;
781 PL_parser->sig_slurpy = 0;
782 parser->expect = XSIGVAR;
783 }
784 siglistornull
785 ')'
786 {
4fa06845
DM
787 OP *sigops = $3;
788 UNOP_AUX_item *aux;
789 OP *check;
d3d9da4a
DM
790
791 assert(FEATURE_SIGNATURES_IS_ENABLED);
792
793 /* We shouldn't get here otherwise */
794 Perl_ck_warner_d(aTHX_
795 packWARN(WARN_EXPERIMENTAL__SIGNATURES),
796 "The signatures feature is experimental");
797
4fa06845
DM
798 aux = (UNOP_AUX_item*)PerlMemShared_malloc(
799 sizeof(UNOP_AUX_item) * 3);
6daeaaa3
DM
800 aux[0].iv = PL_parser->sig_elems;
801 aux[1].iv = PL_parser->sig_optelems;
4fa06845
DM
802 aux[2].iv = PL_parser->sig_slurpy;
803 check = newUNOP_AUX(OP_ARGCHECK, 0, NULL, aux);
804 sigops = op_prepend_elem(OP_LINESEQ, check, sigops);
805 sigops = op_prepend_elem(OP_LINESEQ,
806 newSTATEOP(0, NULL, NULL),
807 sigops);
808 /* a nextstate at the end handles context
809 * correctly for an empty sub body */
810 $$ = op_append_elem(OP_LINESEQ,
811 sigops,
812 newSTATEOP(0, NULL, NULL));
d3d9da4a
DM
813
814 parser->expect = XATTRBLOCK;
815 LEAVE;
816 }
817 ;
818
819
820
30d9c59b 821/* Optional subroutine body, for named subroutine declaration */
abcf453d 822optsubbody: block
2d0e3c96 823 | ';' { $$ = (OP*)NULL; }
8d063cd8
LW
824 ;
825
891be019 826/* Ordinary expressions; logical combinations */
a0d0e21e 827expr : expr ANDOP expr
b5bbe64a 828 { $$ = newLOGOP(OP_AND, 0, $1, $3); }
a0d0e21e 829 | expr OROP expr
b5bbe64a 830 { $$ = newLOGOP($2, 0, $1, $3); }
c963b151 831 | expr DOROP expr
b5bbe64a 832 { $$ = newLOGOP(OP_DOR, 0, $1, $3); }
09b1cffe 833 | listexpr %prec PREC_LOW
a0d0e21e
LW
834 ;
835
891be019 836/* Expressions are a list of terms joined by commas */
09b1cffe 837listexpr: listexpr ','
b5bbe64a 838 { $$ = $1; }
09b1cffe 839 | listexpr ',' term
abcf453d 840 {
29522234 841 OP* term = $3;
2fcb4757 842 $$ = op_append_elem(OP_LIST, $1, term);
f05e27e5 843 }
fad39ff1 844 | term %prec PREC_LOW
8d063cd8
LW
845 ;
846
891be019 847/* List operators */
09b1cffe 848listop : LSTOP indirob listexpr /* map {...} @args or print $fh @args */
03d05f6e 849 { $$ = op_convert_list($1, OPf_STACKED,
b5bbe64a 850 op_prepend_elem(OP_LIST, newGVREF($1,$2), $3) );
f05e27e5 851 }
891be019 852 | FUNC '(' indirob expr ')' /* print ($fh @args */
03d05f6e 853 { $$ = op_convert_list($1, OPf_STACKED,
b5bbe64a 854 op_prepend_elem(OP_LIST, newGVREF($1,$3), $4) );
f05e27e5 855 }
417a992d 856 | term ARROW method '(' optexpr ')' /* $foo->bar(list) */
03d05f6e 857 { $$ = op_convert_list(OP_ENTERSUB, OPf_STACKED,
2fcb4757
Z
858 op_append_elem(OP_LIST,
859 op_prepend_elem(OP_LIST, scalar($1), $5),
b46e009d 860 newMETHOP(OP_METHOD, 0, $3)));
f05e27e5 861 }
891be019 862 | term ARROW method /* $foo->bar */
03d05f6e 863 { $$ = op_convert_list(OP_ENTERSUB, OPf_STACKED,
2fcb4757 864 op_append_elem(OP_LIST, scalar($1),
b46e009d 865 newMETHOP(OP_METHOD, 0, $3)));
f05e27e5 866 }
09b1cffe 867 | METHOD indirob optlistexpr /* new Class @args */
03d05f6e 868 { $$ = op_convert_list(OP_ENTERSUB, OPf_STACKED,
2fcb4757
Z
869 op_append_elem(OP_LIST,
870 op_prepend_elem(OP_LIST, $2, $3),
b46e009d 871 newMETHOP(OP_METHOD, 0, $1)));
f05e27e5 872 }
09b1cffe 873 | FUNCMETH indirob '(' optexpr ')' /* method $object (@args) */
03d05f6e 874 { $$ = op_convert_list(OP_ENTERSUB, OPf_STACKED,
2fcb4757
Z
875 op_append_elem(OP_LIST,
876 op_prepend_elem(OP_LIST, $2, $4),
b46e009d 877 newMETHOP(OP_METHOD, 0, $1)));
f05e27e5 878 }
09b1cffe 879 | LSTOP optlistexpr /* print @args */
03d05f6e 880 { $$ = op_convert_list($1, 0, $2); }
09b1cffe 881 | FUNC '(' optexpr ')' /* print (@args) */
03d05f6e 882 { $$ = op_convert_list($1, 0, $3); }
718a7425 883 | LSTOPSUB startanonsub block /* sub f(&@); f { foo } ... */
5a5094bd 884 { SvREFCNT_inc_simple_void(PL_compcv);
bcabcc50 885 $<opval>$ = newANONATTRSUB($2, 0, (OP*)NULL, $3); }
09b1cffe 886 optlistexpr %prec LSTOP /* ... @bar */
4633a7c4 887 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
2fcb4757
Z
888 op_append_elem(OP_LIST,
889 op_prepend_elem(OP_LIST, $<opval>4, $5), $1));
f05e27e5 890 }
a687059c
LW
891 ;
892
891be019 893/* Names of methods. May use $object->$methodname */
a0d0e21e
LW
894method : METHOD
895 | scalar
896 ;
897
891be019 898/* Some kind of subscripted expression */
89f35911 899subscripted: gelem '{' expr ';' '}' /* *main::{something} */
891be019
SC
900 /* In this and all the hash accessors, ';' is
901 * provided by the tokeniser */
5c86b6df 902 { $$ = newBINOP(OP_GELEM, 0, $1, scalar($3)); }
891be019 903 | scalar '[' expr ']' /* $array[$element] */
f05e27e5 904 { $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3));
f05e27e5 905 }
891be019 906 | term ARROW '[' expr ']' /* somearef->[$element] */
fad39ff1
SM
907 { $$ = newBINOP(OP_AELEM, 0,
908 ref(newAVREF($1),OP_RV2AV),
f05e27e5 909 scalar($4));
f05e27e5 910 }
891be019 911 | subscripted '[' expr ']' /* $foo->[$bar]->[$baz] */
fad39ff1
SM
912 { $$ = newBINOP(OP_AELEM, 0,
913 ref(newAVREF($1),OP_RV2AV),
f05e27e5 914 scalar($3));
f05e27e5 915 }
5a63ceef 916 | scalar '{' expr ';' '}' /* $foo{bar();} */
fad39ff1 917 { $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3));
f05e27e5 918 }
891be019 919 | term ARROW '{' expr ';' '}' /* somehref->{bar();} */
fad39ff1
SM
920 { $$ = newBINOP(OP_HELEM, 0,
921 ref(newHVREF($1),OP_RV2HV),
5c86b6df 922 jmaybe($4)); }
891be019 923 | subscripted '{' expr ';' '}' /* $foo->[bar]->{baz;} */
fad39ff1
SM
924 { $$ = newBINOP(OP_HELEM, 0,
925 ref(newHVREF($1),OP_RV2HV),
5c86b6df 926 jmaybe($3)); }
891be019 927 | term ARROW '(' ')' /* $subref->() */
fad39ff1 928 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
b5bbe64a 929 newCVREF(0, scalar($1))); }
891be019 930 | term ARROW '(' expr ')' /* $subref->(@args) */
fad39ff1 931 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
2fcb4757 932 op_append_elem(OP_LIST, $4,
b5bbe64a 933 newCVREF(0, scalar($1)))); }
fad39ff1 934
417a992d 935 | subscripted '(' expr ')' /* $foo->{bar}->(@args) */
fad39ff1 936 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
2fcb4757 937 op_append_elem(OP_LIST, $3,
b5bbe64a 938 newCVREF(0, scalar($1)))); }
417a992d 939 | subscripted '(' ')' /* $foo->{bar}->() */
fad39ff1 940 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
b5bbe64a 941 newCVREF(0, scalar($1))); }
9a9798c2 942 | '(' expr ')' '[' expr ']' /* list slice */
b5bbe64a 943 { $$ = newSLICEOP(0, $5, $2); }
ea25a9b2 944 | QWLIST '[' expr ']' /* list literal slice */
b5bbe64a 945 { $$ = newSLICEOP(0, $3, $1); }
9a9798c2 946 | '(' ')' '[' expr ']' /* empty list slice! */
b5bbe64a 947 { $$ = newSLICEOP(0, $4, (OP*)NULL); }
891be019 948 ;
fad39ff1 949
891be019 950/* Binary operators between terms */
f05e27e5 951termbinop: term ASSIGNOP term /* $x = $y */
b5bbe64a 952 { $$ = newASSIGNOP(OPf_STACKED, $1, $2, $3); }
891be019 953 | term POWOP term /* $x ** $y */
b5bbe64a 954 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 955 | term MULOP term /* $x * $y, $x x $y */
b5bbe64a 956 { if ($2 != OP_REPEAT)
79072805 957 scalar($1);
b5bbe64a 958 $$ = newBINOP($2, 0, $1, scalar($3));
f05e27e5 959 }
891be019 960 | term ADDOP term /* $x + $y */
b5bbe64a 961 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 962 | term SHIFTOP term /* $x >> $y, $x << $y */
b5bbe64a 963 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 964 | term RELOP term /* $x > $y, etc. */
b5bbe64a 965 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 966 | term EQOP term /* $x == $y, $x eq $y */
b5bbe64a 967 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 968 | term BITANDOP term /* $x & $y */
b5bbe64a 969 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 970 | term BITOROP term /* $x | $y */
b5bbe64a 971 { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
891be019 972 | term DOTDOT term /* $x..$y, $x...$y */
b5bbe64a 973 { $$ = newRANGE($2, scalar($1), scalar($3)); }
891be019 974 | term ANDAND term /* $x && $y */
b5bbe64a 975 { $$ = newLOGOP(OP_AND, 0, $1, $3); }
891be019 976 | term OROR term /* $x || $y */
b5bbe64a 977 { $$ = newLOGOP(OP_OR, 0, $1, $3); }
c963b151 978 | term DORDOR term /* $x // $y */
b5bbe64a 979 { $$ = newLOGOP(OP_DOR, 0, $1, $3); }
891be019 980 | term MATCHOP term /* $x =~ /$y/ */
b5bbe64a 981 { $$ = bind_match($2, $1, $3); }
891be019 982 ;
8d063cd8 983
891be019
SC
984/* Unary operators and terms */
985termunop : '-' term %prec UMINUS /* -$x */
b5bbe64a 986 { $$ = newUNOP(OP_NEGATE, 0, scalar($2)); }
891be019 987 | '+' term %prec UMINUS /* +$x */
b5bbe64a
JH
988 { $$ = $2; }
989
891be019 990 | '!' term /* !$x */
b5bbe64a 991 { $$ = newUNOP(OP_NOT, 0, scalar($2)); }
891be019 992 | '~' term /* ~$x */
8823cb89 993 { $$ = newUNOP($1, 0, scalar($2)); }
891be019 994 | term POSTINC /* $x++ */
79072805 995 { $$ = newUNOP(OP_POSTINC, 0,
b5bbe64a 996 op_lvalue(scalar($1), OP_POSTINC)); }
891be019 997 | term POSTDEC /* $x-- */
79072805 998 { $$ = newUNOP(OP_POSTDEC, 0,
b5bbe64a 999 op_lvalue(scalar($1), OP_POSTDEC));}
cc624add 1000 | term POSTJOIN /* implicit join after interpolated ->@ */
03d05f6e 1001 { $$ = op_convert_list(OP_JOIN, 0,
cc624add
FC
1002 op_append_elem(
1003 OP_LIST,
1004 newSVREF(scalar(
1005 newSVOP(OP_CONST,0,
1006 newSVpvs("\""))
1007 )),
1008 $1
1009 ));
cc624add 1010 }
891be019 1011 | PREINC term /* ++$x */
79072805 1012 { $$ = newUNOP(OP_PREINC, 0,
b5bbe64a 1013 op_lvalue(scalar($2), OP_PREINC)); }
891be019 1014 | PREDEC term /* --$x */
79072805 1015 { $$ = newUNOP(OP_PREDEC, 0,
b5bbe64a 1016 op_lvalue(scalar($2), OP_PREDEC)); }
891be019
SC
1017
1018 ;
1019
1020/* Constructors for anonymous data */
1021anonymous: '[' expr ']'
b5bbe64a 1022 { $$ = newANONLIST($2); }
891be019 1023 | '[' ']'
b5bbe64a 1024 { $$ = newANONLIST((OP*)NULL);}
891be019 1025 | HASHBRACK expr ';' '}' %prec '(' /* { foo => "Bar" } */
b5bbe64a 1026 { $$ = newANONHASH($2); }
891be019 1027 | HASHBRACK ';' '}' %prec '(' /* { } (';' by tokener) */
b5bbe64a 1028 { $$ = newANONHASH((OP*)NULL); }
abcf453d 1029 | ANONSUB startanonsub proto subattrlist block %prec '('
5a5094bd 1030 { SvREFCNT_inc_simple_void(PL_compcv);
b5bbe64a 1031 $$ = newANONATTRSUB($2, $3, $4, $5); }
abcf453d
PM
1032 | ANONSUB startanonsub remember subsignature subattrlist '{' stmtseq '}' %prec '('
1033 {
1034 OP *body;
1035 if (parser->copline > (line_t)$6)
1036 parser->copline = (line_t)$6;
1037 body = block_end($3,
1038 op_append_list(OP_LINESEQ, $4, $7));
1039 SvREFCNT_inc_simple_void(PL_compcv);
1040 $$ = newANONATTRSUB($2, NULL, $5, body);
1041 }
891be019
SC
1042
1043 ;
1044
1045/* Things called with "do" */
1046termdo : DO term %prec UNIOP /* do $filename */
b5bbe64a 1047 { $$ = dofile($2, $1);}
891be019 1048 | DO block %prec '(' /* do { code */
b5bbe64a 1049 { $$ = newUNOP(OP_NULL, OPf_SPECIAL, op_scope($2));}
891be019
SC
1050 ;
1051
1052term : termbinop
1053 | termunop
1054 | anonymous
1055 | termdo
e9bdcc27 1056 | term '?' term ':' term
b5bbe64a 1057 { $$ = newCONDOP(0, $1, $3, $5); }
891be019 1058 | REFGEN term /* \$x, \@y, \%z */
070d3cb6 1059 { $$ = newUNOP(OP_REFGEN, 0, $2); }
e118fea3
FC
1060 | MY REFGEN term
1061 { $$ = newUNOP(OP_REFGEN, 0, localize($3,1)); }
09bef843
SB
1062 | myattrterm %prec UNIOP
1063 { $$ = $1; }
1064 | LOCAL term %prec UNIOP
28383d1a 1065 { $$ = localize($2,0); }
a0d0e21e 1066 | '(' expr ')'
b5bbe64a 1067 { $$ = sawparens($2); }
ea25a9b2 1068 | QWLIST
b5bbe64a 1069 { $$ = $1; }
8d063cd8 1070 | '(' ')'
b5bbe64a 1071 { $$ = sawparens(newNULLLIST()); }
79072805 1072 | scalar %prec '('
8d063cd8 1073 { $$ = $1; }
79072805 1074 | star %prec '('
8d063cd8 1075 { $$ = $1; }
79072805 1076 | hsh %prec '('
8d063cd8 1077 { $$ = $1; }
79072805 1078 | ary %prec '('
8d063cd8 1079 { $$ = $1; }
891be019 1080 | arylen %prec '(' /* $#x, $#{ something } */
79072805 1081 { $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));}
fad39ff1
SM
1082 | subscripted
1083 { $$ = $1; }
89f35911 1084 | sliceme '[' expr ']' /* array slice */
2fcb4757 1085 { $$ = op_prepend_elem(OP_ASLICE,
79072805 1086 newOP(OP_PUSHMARK, 0),
79072805
LW
1087 newLISTOP(OP_ASLICE, 0,
1088 list($3),
f05e27e5 1089 ref($1, OP_ASLICE)));
429a2555
FC
1090 if ($$ && $1)
1091 $$->op_private |=
1092 $1->op_private & OPpSLICEWARNING;
f05e27e5 1093 }
76eba8ab 1094 | kvslice '[' expr ']' /* array key/value slice */
6dd3e0f2
RZ
1095 { $$ = op_prepend_elem(OP_KVASLICE,
1096 newOP(OP_PUSHMARK, 0),
1097 newLISTOP(OP_KVASLICE, 0,
1098 list($3),
1099 ref(oopsAV($1), OP_KVASLICE)));
95a31aad
FC
1100 if ($$ && $1)
1101 $$->op_private |=
1102 $1->op_private & OPpSLICEWARNING;
6dd3e0f2 1103 }
89f35911 1104 | sliceme '{' expr ';' '}' /* @hash{@keys} */
2fcb4757 1105 { $$ = op_prepend_elem(OP_HSLICE,
79072805 1106 newOP(OP_PUSHMARK, 0),
79072805
LW
1107 newLISTOP(OP_HSLICE, 0,
1108 list($3),
a0d0e21e 1109 ref(oopsHV($1), OP_HSLICE)));
429a2555
FC
1110 if ($$ && $1)
1111 $$->op_private |=
1112 $1->op_private & OPpSLICEWARNING;
f05e27e5 1113 }
76eba8ab 1114 | kvslice '{' expr ';' '}' /* %hash{@keys} */
5cae3edb
RZ
1115 { $$ = op_prepend_elem(OP_KVHSLICE,
1116 newOP(OP_PUSHMARK, 0),
1117 newLISTOP(OP_KVHSLICE, 0,
1118 list($3),
1119 ref($1, OP_KVHSLICE)));
95a31aad
FC
1120 if ($$ && $1)
1121 $$->op_private |=
1122 $1->op_private & OPpSLICEWARNING;
5cae3edb 1123 }
79072805
LW
1124 | THING %prec '('
1125 { $$ = $1; }
891be019 1126 | amper /* &foo; */
c07a80fd 1127 { $$ = newUNOP(OP_ENTERSUB, 0, scalar($1)); }
fb602e32 1128 | amper '(' ')' /* &foo() or foo() */
f05e27e5 1129 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1));
f05e27e5 1130 }
fb602e32 1131 | amper '(' expr ')' /* &foo(@args) or foo(@args) */
f05e27e5
DM
1132 {
1133 $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
2fcb4757 1134 op_append_elem(OP_LIST, $3, scalar($1)));
f05e27e5 1135 }
fb602e32 1136 | NOAMP subname optlistexpr /* foo @args (no parens) */
a0d0e21e 1137 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
2fcb4757 1138 op_append_elem(OP_LIST, $3, scalar($2)));
f05e27e5 1139 }
89f35911 1140 | term ARROW '$' '*'
b5bbe64a 1141 { $$ = newSVREF($1); }
89f35911 1142 | term ARROW '@' '*'
b5bbe64a 1143 { $$ = newAVREF($1); }
89f35911 1144 | term ARROW '%' '*'
b5bbe64a 1145 { $$ = newHVREF($1); }
89f35911
FC
1146 | term ARROW '&' '*'
1147 { $$ = newUNOP(OP_ENTERSUB, 0,
b5bbe64a 1148 scalar(newCVREF($3,$1))); }
89f35911 1149 | term ARROW '*' '*' %prec '('
b5bbe64a 1150 { $$ = newGVREF(0,$1); }
891be019 1151 | LOOPEX /* loop exiting command (goto, last, dump, etc) */
b5bbe64a
JH
1152 { $$ = newOP($1, OPf_SPECIAL);
1153 PL_hints |= HINT_BLOCK_SCOPE; }
a0d0e21e 1154 | LOOPEX term
b5bbe64a 1155 { $$ = newLOOPEX($1,$2); }
09b1cffe 1156 | NOTOP listexpr /* not $foo */
b5bbe64a 1157 { $$ = newUNOP(OP_NOT, 0, scalar($2)); }
891be019 1158 | UNIOP /* Unary op, $_ implied */
b5bbe64a 1159 { $$ = newOP($1, 0); }
f05e27e5 1160 | UNIOP block /* eval { foo }* */
b5bbe64a 1161 { $$ = newUNOP($1, 0, $2); }
891be019 1162 | UNIOP term /* Unary op */
b5bbe64a 1163 { $$ = newUNOP($1, 0, $2); }
d2fdf8fd 1164 | REQUIRE /* require, $_ implied */
b5bbe64a 1165 { $$ = newOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0); }
d2fdf8fd 1166 | REQUIRE term /* require Foo */
b5bbe64a 1167 { $$ = newUNOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0, $2); }
3cd0a11a
RGS
1168 | UNIOPSUB
1169 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); }
891be019 1170 | UNIOPSUB term /* Sub treated as unop */
4633a7c4 1171 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
2fcb4757 1172 op_append_elem(OP_LIST, $2, scalar($1))); }
891be019 1173 | FUNC0 /* Nullary operator */
b5bbe64a 1174 { $$ = newOP($1, 0); }
ae986130 1175 | FUNC0 '(' ')'
b5bbe64a 1176 { $$ = newOP($1, 0);}
7eb971ee
FC
1177 | FUNC0OP /* Same as above, but op created in toke.c */
1178 { $$ = $1; }
1179 | FUNC0OP '(' ')'
b5bbe64a 1180 { $$ = $1; }
891be019 1181 | FUNC0SUB /* Sub treated as nullop */
b5bbe64a 1182 { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); }
891be019 1183 | FUNC1 '(' ')' /* not () */
b5bbe64a
JH
1184 { $$ = ($1 == OP_NOT)
1185 ? newUNOP($1, 0, newSVOP(OP_CONST, 0, newSViv(0)))
1186 : newOP($1, OPf_SPECIAL); }
891be019 1187 | FUNC1 '(' expr ')' /* not($foo) */
b5bbe64a 1188 { $$ = newUNOP($1, 0, $3); }
d63c20f2
DM
1189 | PMFUNC /* m//, s///, qr//, tr/// */
1190 {
1191 if ( $1->op_type != OP_TRANS
1192 && $1->op_type != OP_TRANSR
1193 && (((PMOP*)$1)->op_pmflags & PMf_HAS_CV))
1194 {
1195 $<ival>$ = start_subparse(FALSE, CVf_ANON);
1196 SAVEFREESV(PL_compcv);
1197 } else
1198 $<ival>$ = 0;
1199 }
9b6b7be8
FC
1200 '(' listexpr optrepl ')'
1201 { $$ = pmruntime($1, $4, $5, 1, $<ival>2); }
185c2e96 1202 | BAREWORD
378cc40b 1203 | listop
be25f609 1204 | YADAYADA
1205 {
1206 $$ = newLISTOP(OP_DIE, 0, newOP(OP_PUSHMARK, 0),
1207 newSVOP(OP_CONST, 0, newSVpvs("Unimplemented")));
1208 }
88e1f1a2 1209 | PLUGEXPR
8d063cd8
LW
1210 ;
1211
891be019 1212/* "my" declarations, with optional attributes */
09bef843 1213myattrterm: MY myterm myattrlist
b5bbe64a 1214 { $$ = my_attrs($2,$3); }
09bef843 1215 | MY myterm
28383d1a 1216 { $$ = localize($2,1); }
e118fea3
FC
1217 | MY REFGEN myterm myattrlist
1218 { $$ = newUNOP(OP_REFGEN, 0, my_attrs($3,$4)); }
09bef843
SB
1219 ;
1220
891be019 1221/* Things that can be "my"'d */
09bef843 1222myterm : '(' expr ')'
b5bbe64a 1223 { $$ = sawparens($2); }
09bef843 1224 | '(' ')'
b5bbe64a
JH
1225 { $$ = sawparens(newNULLLIST()); }
1226
09bef843
SB
1227 | scalar %prec '('
1228 { $$ = $1; }
1229 | hsh %prec '('
1230 { $$ = $1; }
1231 | ary %prec '('
1232 { $$ = $1; }
1233 ;
1234
891be019 1235/* Basic list expressions */
09b1cffe 1236optlistexpr: /* NULL */ %prec PREC_LOW
bcabcc50 1237 { $$ = (OP*)NULL; }
09b1cffe 1238 | listexpr %prec PREC_LOW
a0d0e21e
LW
1239 { $$ = $1; }
1240 ;
1241
09b1cffe 1242optexpr: /* NULL */
bcabcc50 1243 { $$ = (OP*)NULL; }
79072805
LW
1244 | expr
1245 { $$ = $1; }
1246 ;
1247
9b6b7be8
FC
1248optrepl: /* NULL */
1249 { $$ = (OP*)NULL; }
1250 | '/' expr
1251 { $$ = $2; }
1252 ;
1253
891be019
SC
1254/* A little bit of trickery to make "for my $foo (@bar)" actually be
1255 lexical */
55497cff 1256my_scalar: scalar
624fa8bd 1257 { parser->in_my = 0; $$ = my($1); }
55497cff
PP
1258 ;
1259
d39c26a6
FC
1260my_var : scalar
1261 | ary
1262 | hsh
1263 ;
1264
1265refgen_topic: my_var
1266 | amper
1267 ;
1268
e118fea3
FC
1269my_refgen: MY REFGEN
1270 | REFGEN MY
1271 ;
1272
79072805 1273amper : '&' indirob
b5bbe64a 1274 { $$ = newCVREF($1,$2); }
a687059c
LW
1275 ;
1276
79072805 1277scalar : '$' indirob
b5bbe64a 1278 { $$ = newSVREF($2); }
a687059c
LW
1279 ;
1280
79072805 1281ary : '@' indirob
f05e27e5 1282 { $$ = newAVREF($2);
b5bbe64a 1283 if ($$) $$->op_private |= $1;
f05e27e5 1284 }
79072805
LW
1285 ;
1286
1287hsh : '%' indirob
f05e27e5 1288 { $$ = newHVREF($2);
b5bbe64a 1289 if ($$) $$->op_private |= $1;
f05e27e5 1290 }
79072805
LW
1291 ;
1292
1293arylen : DOLSHARP indirob
b5bbe64a 1294 { $$ = newAVREF($2); }
ff25e5db 1295 | term ARROW DOLSHARP '*'
b5bbe64a 1296 { $$ = newAVREF($1); }
79072805
LW
1297 ;
1298
1299star : '*' indirob
b5bbe64a 1300 { $$ = newGVREF(0,$2); }
79072805
LW
1301 ;
1302
89f35911
FC
1303sliceme : ary
1304 | term ARROW '@'
b5bbe64a 1305 { $$ = newAVREF($1); }
89f35911
FC
1306 ;
1307
76eba8ab
FC
1308kvslice : hsh
1309 | term ARROW '%'
b5bbe64a 1310 { $$ = newHVREF($1); }
76eba8ab
FC
1311 ;
1312
89f35911
FC
1313gelem : star
1314 | term ARROW '*'
b5bbe64a 1315 { $$ = newGVREF(0,$1); }
89f35911
FC
1316 ;
1317
891be019 1318/* Indirect objects */
185c2e96 1319indirob : BAREWORD
79072805 1320 { $$ = scalar($1); }
fad39ff1 1321 | scalar %prec PREC_LOW
f05e27e5 1322 { $$ = scalar($1); }
79072805 1323 | block
3ad73efd 1324 { $$ = op_scope($1); }
79072805 1325
93a17b20
LW
1326 | PRIVATEREF
1327 { $$ = $1; }
8d063cd8 1328 ;