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Perl core dumps when running out of memory [PATCH]
[perl5.git] / op.c
CommitLineData
a0d0e21e 1/* op.c
79072805 2 *
4bb101f2
JH		 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, by Larry Wall and others
79072805
LW		 5 *
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.
8 *
a0d0e21e
LW		 9 */
10
11/*
12 * "You see: Mr. Drogo, he married poor Miss Primula Brandybuck. She was
13 * our Mr. Bilbo's first cousin on the mother's side (her mother being the
14 * youngest of the Old Took's daughters); and Mr. Drogo was his second
15 * cousin. So Mr. Frodo is his first *and* second cousin, once removed
16 * either way, as the saying is, if you follow me." --the Gaffer
79072805
LW		 17 */
18
ccfc67b7 19
79072805 20#include "EXTERN.h"
864dbfa3 21#define PERL_IN_OP_C
79072805 22#include "perl.h"
77ca0c92 23#include "keywords.h"
79072805 24
a07e034d 25#define CALL_PEEP(o) CALL_FPTR(PL_peepp)(aTHX_ o)
a2efc822 26
238a4c30
NIS		 27#if defined(PL_OP_SLAB_ALLOC)
28
29#ifndef PERL_SLAB_SIZE
30#define PERL_SLAB_SIZE 2048
31#endif
32
c7e45529
AE		 33void *
34Perl_Slab_Alloc(pTHX_ int m, size_t sz)
1c846c1f 35{
5a8e194f
NIS		 36 /*
37 * To make incrementing use count easy PL_OpSlab is an I32 *
38 * To make inserting the link to slab PL_OpPtr is I32 **
39 * So compute size in units of sizeof(I32 *) as that is how Pl_OpPtr increments
40 * Add an overhead for pointer to slab and round up as a number of pointers
41 */
42 sz = (sz + 2*sizeof(I32 *) -1)/sizeof(I32 *);
238a4c30 43 if ((PL_OpSpace -= sz) < 0) {
083fcd59
JH		 44 PL_OpPtr = (I32 **) PerlMemShared_malloc(PERL_SLAB_SIZE*sizeof(I32*));
45 if (!PL_OpPtr) {
238a4c30
NIS		 46 return NULL;
47 }
5a8e194f
NIS		 48 Zero(PL_OpPtr,PERL_SLAB_SIZE,I32 **);
49 /* We reserve the 0'th I32 sized chunk as a use count */
50 PL_OpSlab = (I32 *) PL_OpPtr;
51 /* Reduce size by the use count word, and by the size we need.
52 * Latter is to mimic the '-=' in the if() above
53 */
54 PL_OpSpace = PERL_SLAB_SIZE - (sizeof(I32)+sizeof(I32 **)-1)/sizeof(I32 **) - sz;
238a4c30
NIS		 55 /* Allocation pointer starts at the top.
56 Theory: because we build leaves before trunk allocating at end
57 means that at run time access is cache friendly upward
58 */
5a8e194f 59 PL_OpPtr += PERL_SLAB_SIZE;
238a4c30
NIS		 60 }
61 assert( PL_OpSpace >= 0 );
62 /* Move the allocation pointer down */
63 PL_OpPtr -= sz;
5a8e194f 64 assert( PL_OpPtr > (I32 **) PL_OpSlab );
238a4c30
NIS		 65 *PL_OpPtr = PL_OpSlab; /* Note which slab it belongs to */
66 (*PL_OpSlab)++; /* Increment use count of slab */
5a8e194f 67 assert( PL_OpPtr+sz <= ((I32 **) PL_OpSlab + PERL_SLAB_SIZE) );
238a4c30
NIS		 68 assert( *PL_OpSlab > 0 );
69 return (void *)(PL_OpPtr + 1);
70}
71
c7e45529
AE		 72void
73Perl_Slab_Free(pTHX_ void *op)
238a4c30 74{
5a8e194f
NIS		 75 I32 **ptr = (I32 **) op;
76 I32 *slab = ptr[-1];
77 assert( ptr-1 > (I32 **) slab );
78 assert( ptr < ( (I32 **) slab + PERL_SLAB_SIZE) );
238a4c30
NIS		 79 assert( *slab > 0 );
80 if (--(*slab) == 0) {
7e4e8c89
NC		 81# ifdef NETWARE
82# define PerlMemShared PerlMem
83# endif
083fcd59
JH		 84
85 PerlMemShared_free(slab);
238a4c30
NIS		 86 if (slab == PL_OpSlab) {
87 PL_OpSpace = 0;
88 }
89 }
b7dc083c 90}
b7dc083c 91#endif
e50aee73 92/*
5dc0d613 93 * In the following definition, the ", Nullop" is just to make the compiler
a5f75d66 94 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 95 */
11343788 96#define CHECKOP(type,o) \
3280af22 97 ((PL_op_mask && PL_op_mask[type]) \
5dc0d613 98 ? ( op_free((OP*)o), \
cb77fdf0 99 Perl_croak(aTHX_ "'%s' trapped by operation mask", PL_op_desc[type]), \
28757baa 100 Nullop ) \
fc0dc3b3 101 : CALL_FPTR(PL_check[type])(aTHX_ (OP*)o))
e50aee73 102
e6438c1a 103#define RETURN_UNLIMITED_NUMBER (PERL_INT_MAX / 2)
c53d7c7d 104
76e3520e 105STATIC char*
cea2e8a9 106S_gv_ename(pTHX_ GV *gv)
4633a7c4 107{
2d8e6c8d 108 STRLEN n_a;
4633a7c4 109 SV* tmpsv = sv_newmortal();
46fc3d4c 110 gv_efullname3(tmpsv, gv, Nullch);
2d8e6c8d 111 return SvPV(tmpsv,n_a);
4633a7c4
LW		 112}
113
76e3520e 114STATIC OP *
cea2e8a9 115S_no_fh_allowed(pTHX_ OP *o)
79072805 116{
cea2e8a9 117 yyerror(Perl_form(aTHX_ "Missing comma after first argument to %s function",
53e06cf0 118 OP_DESC(o)));
11343788 119 return o;
79072805
LW		 120}
121
76e3520e 122STATIC OP *
cea2e8a9 123S_too_few_arguments(pTHX_ OP *o, char *name)
79072805 124{
cea2e8a9 125 yyerror(Perl_form(aTHX_ "Not enough arguments for %s", name));
11343788 126 return o;
79072805
LW		 127}
128
76e3520e 129STATIC OP *
cea2e8a9 130S_too_many_arguments(pTHX_ OP *o, char *name)
79072805 131{
cea2e8a9 132 yyerror(Perl_form(aTHX_ "Too many arguments for %s", name));
11343788 133 return o;
79072805
LW		 134}
135
76e3520e 136STATIC void
cea2e8a9 137S_bad_type(pTHX_ I32 n, char *t, char *name, OP *kid)
8990e307 138{
cea2e8a9 139 yyerror(Perl_form(aTHX_ "Type of arg %d to %s must be %s (not %s)",
53e06cf0 140 (int)n, name, t, OP_DESC(kid)));
8990e307
LW		 141}
142
7a52d87a 143STATIC void
cea2e8a9 144S_no_bareword_allowed(pTHX_ OP *o)
7a52d87a 145{
5a844595 146 qerror(Perl_mess(aTHX_
35c1215d
NC		 147 "Bareword \"%"SVf"\" not allowed while \"strict subs\" in use",
148 cSVOPo_sv));
7a52d87a
GS		 149}
150
79072805
LW		 151/* "register" allocation */
152
153PADOFFSET
dd2155a4 154Perl_allocmy(pTHX_ char *name)
93a17b20 155{
a0d0e21e 156 PADOFFSET off;
a0d0e21e 157
dd2155a4 158 /* complain about "my $_" etc etc */
155aba94
GS		 159 if (!(PL_in_my == KEY_our ||
160 isALPHA(name[1]) ||
39e02b42 161 (USE_UTF8_IN_NAMES && UTF8_IS_START(name[1])) ||
155aba94 162 (name[1] == '_' && (int)strlen(name) > 2)))
834a4ddd 163 {
c4d0567e 164 if (!isPRINT(name[1]) || strchr("\t\n\r\f", name[1])) {
2b92dfce
GS		 165 /* 1999-02-27 mjd@plover.com */
166 char *p;
167 p = strchr(name, '\0');
168 /* The next block assumes the buffer is at least 205 chars
169 long. At present, it's always at least 256 chars. */
170 if (p-name > 200) {
171 strcpy(name+200, "...");
172 p = name+199;
173 }
174 else {
175 p[1] = '\0';
176 }
177 /* Move everything else down one character */
178 for (; p-name > 2; p--)
179 *p = *(p-1);
46fc3d4c 180 name[2] = toCTRL(name[1]);
181 name[1] = '^';
182 }
cea2e8a9 183 yyerror(Perl_form(aTHX_ "Can't use global %s in \"my\"",name));
a0d0e21e 184 }
748a9306 185
dd2155a4
DM		 186 /* check for duplicate declaration */
187 pad_check_dup(name,
c5661c80 188 (bool)(PL_in_my == KEY_our),
dd2155a4
DM		 189 (PL_curstash ? PL_curstash : PL_defstash)
190 );
33b8ce05 191
dd2155a4
DM		 192 if (PL_in_my_stash && *name != '$') {
193 yyerror(Perl_form(aTHX_
194 "Can't declare class for non-scalar %s in \"%s\"",
195 name, PL_in_my == KEY_our ? "our" : "my"));
6b35e009
GS		 196 }
197
dd2155a4 198 /* allocate a spare slot and store the name in that slot */
93a17b20 199
dd2155a4
DM		 200 off = pad_add_name(name,
201 PL_in_my_stash,
202 (PL_in_my == KEY_our
203 ? (PL_curstash ? PL_curstash : PL_defstash)
204 : Nullhv
205 ),
206 0 /* not fake */
207 );
208 return off;
79072805
LW		 209}
210
79072805
LW		 211/* Destructor */
212
213void
864dbfa3 214Perl_op_free(pTHX_ OP *o)
79072805 215{
85e6fe83 216 register OP *kid, *nextkid;
acb36ea4 217 OPCODE type;
79072805 218
5dc0d613 219 if (!o || o->op_seq == (U16)-1)
79072805
LW		 220 return;
221
7934575e
GS		 222 if (o->op_private & OPpREFCOUNTED) {
223 switch (o->op_type) {
224 case OP_LEAVESUB:
225 case OP_LEAVESUBLV:
226 case OP_LEAVEEVAL:
227 case OP_LEAVE:
228 case OP_SCOPE:
229 case OP_LEAVEWRITE:
230 OP_REFCNT_LOCK;
231 if (OpREFCNT_dec(o)) {
232 OP_REFCNT_UNLOCK;
233 return;
234 }
235 OP_REFCNT_UNLOCK;
236 break;
237 default:
238 break;
239 }
240 }
241
11343788
MB		 242 if (o->op_flags & OPf_KIDS) {
243 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 244 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 245 op_free(kid);
85e6fe83 246 }
79072805 247 }
acb36ea4
GS		 248 type = o->op_type;
249 if (type == OP_NULL)
eb160463 250 type = (OPCODE)o->op_targ;
acb36ea4
GS		 251
252 /* COP* is not cleared by op_clear() so that we may track line
253 * numbers etc even after null() */
254 if (type == OP_NEXTSTATE || type == OP_SETSTATE || type == OP_DBSTATE)
255 cop_free((COP*)o);
256
257 op_clear(o);
238a4c30 258 FreeOp(o);
acb36ea4 259}
79072805 260
93c66552
DM		 261void
262Perl_op_clear(pTHX_ OP *o)
acb36ea4 263{
13137afc 264
11343788 265 switch (o->op_type) {
acb36ea4
GS		 266 case OP_NULL: /* Was holding old type, if any. */
267 case OP_ENTEREVAL: /* Was holding hints. */
acb36ea4 268 o->op_targ = 0;
a0d0e21e 269 break;
a6006777 270 default:
ac4c12e7 271 if (!(o->op_flags & OPf_REF)
0b94c7bb 272 || (PL_check[o->op_type] != MEMBER_TO_FPTR(Perl_ck_ftst)))
a6006777 273 break;
274 /* FALL THROUGH */
463ee0b2 275 case OP_GVSV:
79072805 276 case OP_GV:
a6006777 277 case OP_AELEMFAST:
350de78d 278#ifdef USE_ITHREADS
971a9dd3 279 if (cPADOPo->op_padix > 0) {
dd2155a4
DM		 280 /* No GvIN_PAD_off(cGVOPo_gv) here, because other references
281 * may still exist on the pad */
282 pad_swipe(cPADOPo->op_padix, TRUE);
971a9dd3
GS		 283 cPADOPo->op_padix = 0;
284 }
350de78d 285#else
971a9dd3 286 SvREFCNT_dec(cSVOPo->op_sv);
7934575e 287 cSVOPo->op_sv = Nullsv;
350de78d 288#endif
79072805 289 break;
a1ae71d2 290 case OP_METHOD_NAMED:
79072805 291 case OP_CONST:
11343788 292 SvREFCNT_dec(cSVOPo->op_sv);
acb36ea4 293 cSVOPo->op_sv = Nullsv;
3b1c21fa
AB		 294#ifdef USE_ITHREADS
295 /** Bug #15654
296 Even if op_clear does a pad_free for the target of the op,
297 pad_free doesn't actually remove the sv that exists in the bad
298 instead it lives on. This results in that it could be reused as
299 a target later on when the pad was reallocated.
300 **/
301 if(o->op_targ) {
302 pad_swipe(o->op_targ,1);
303 o->op_targ = 0;
304 }
305#endif
79072805 306 break;
748a9306
LW		 307 case OP_GOTO:
308 case OP_NEXT:
309 case OP_LAST:
310 case OP_REDO:
11343788 311 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 312 break;
313 /* FALL THROUGH */
a0d0e21e 314 case OP_TRANS:
acb36ea4 315 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
a0ed51b3 316 SvREFCNT_dec(cSVOPo->op_sv);
acb36ea4
GS		 317 cSVOPo->op_sv = Nullsv;
318 }
319 else {
a0ed51b3 320 Safefree(cPVOPo->op_pv);
acb36ea4
GS		 321 cPVOPo->op_pv = Nullch;
322 }
a0d0e21e
LW		 323 break;
324 case OP_SUBST:
11343788 325 op_free(cPMOPo->op_pmreplroot);
971a9dd3 326 goto clear_pmop;
748a9306 327 case OP_PUSHRE:
971a9dd3 328#ifdef USE_ITHREADS
ba89bb6e 329 if (INT2PTR(PADOFFSET, cPMOPo->op_pmreplroot)) {
dd2155a4
DM		 330 /* No GvIN_PAD_off here, because other references may still
331 * exist on the pad */
332 pad_swipe(INT2PTR(PADOFFSET, cPMOPo->op_pmreplroot), TRUE);
971a9dd3
GS		 333 }
334#else
335 SvREFCNT_dec((SV*)cPMOPo->op_pmreplroot);
336#endif
337 /* FALL THROUGH */
a0d0e21e 338 case OP_MATCH:
8782bef2 339 case OP_QR:
971a9dd3 340clear_pmop:
cb55de95
JH		 341 {
342 HV *pmstash = PmopSTASH(cPMOPo);
343 if (pmstash && SvREFCNT(pmstash)) {
344 PMOP *pmop = HvPMROOT(pmstash);
345 PMOP *lastpmop = NULL;
346 while (pmop) {
347 if (cPMOPo == pmop) {
348 if (lastpmop)
349 lastpmop->op_pmnext = pmop->op_pmnext;
350 else
351 HvPMROOT(pmstash) = pmop->op_pmnext;
352 break;
353 }
354 lastpmop = pmop;
355 pmop = pmop->op_pmnext;
356 }
83da49e6 357 }
05ec9bb3 358 PmopSTASH_free(cPMOPo);
cb55de95 359 }
971a9dd3 360 cPMOPo->op_pmreplroot = Nullop;
5f8cb046
DM		 361 /* we use the "SAFE" version of the PM_ macros here
362 * since sv_clean_all might release some PMOPs
363 * after PL_regex_padav has been cleared
364 * and the clearing of PL_regex_padav needs to
365 * happen before sv_clean_all
366 */
367 ReREFCNT_dec(PM_GETRE_SAFE(cPMOPo));
368 PM_SETRE_SAFE(cPMOPo, (REGEXP*)NULL);
13137afc
AB		 369#ifdef USE_ITHREADS
370 if(PL_regex_pad) { /* We could be in destruction */
371 av_push((AV*) PL_regex_pad[0],(SV*) PL_regex_pad[(cPMOPo)->op_pmoffset]);
1cc8b4c5 372 SvREPADTMP_on(PL_regex_pad[(cPMOPo)->op_pmoffset]);
13137afc
AB		 373 PM_SETRE(cPMOPo, (cPMOPo)->op_pmoffset);
374 }
1eb1540c 375#endif
13137afc 376
a0d0e21e 377 break;
79072805
LW		 378 }
379
743e66e6 380 if (o->op_targ > 0) {
11343788 381 pad_free(o->op_targ);
743e66e6
GS		 382 o->op_targ = 0;
383 }
79072805
LW		 384}
385
76e3520e 386STATIC void
3eb57f73
HS		 387S_cop_free(pTHX_ COP* cop)
388{
05ec9bb3
NIS		 389 Safefree(cop->cop_label); /* FIXME: treaddead ??? */
390 CopFILE_free(cop);
391 CopSTASH_free(cop);
0453d815 392 if (! specialWARN(cop->cop_warnings))
3eb57f73 393 SvREFCNT_dec(cop->cop_warnings);
05ec9bb3
NIS		 394 if (! specialCopIO(cop->cop_io)) {
395#ifdef USE_ITHREADS
042f6df8 396#if 0
05ec9bb3
NIS		 397 STRLEN len;
398 char *s = SvPV(cop->cop_io,len);
b178108d
JH		 399 Perl_warn(aTHX_ "io='%.*s'",(int) len,s); /* ??? --jhi */
400#endif
05ec9bb3 401#else
ac27b0f5 402 SvREFCNT_dec(cop->cop_io);
05ec9bb3
NIS		 403#endif
404 }
3eb57f73
HS		 405}
406
93c66552
DM		 407void
408Perl_op_null(pTHX_ OP *o)
8990e307 409{
acb36ea4
GS		 410 if (o->op_type == OP_NULL)
411 return;
412 op_clear(o);
11343788
MB		 413 o->op_targ = o->op_type;
414 o->op_type = OP_NULL;
22c35a8c 415 o->op_ppaddr = PL_ppaddr[OP_NULL];
8990e307
LW		 416}
417
79072805
LW		 418/* Contextualizers */
419
463ee0b2 420#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 421
422OP *
864dbfa3 423Perl_linklist(pTHX_ OP *o)
79072805
LW		 424{
425 register OP *kid;
426
11343788
MB		 427 if (o->op_next)
428 return o->op_next;
79072805
LW		 429
430 /* establish postfix order */
11343788
MB		 431 if (cUNOPo->op_first) {
432 o->op_next = LINKLIST(cUNOPo->op_first);
433 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 434 if (kid->op_sibling)
435 kid->op_next = LINKLIST(kid->op_sibling);
436 else
11343788 437 kid->op_next = o;
79072805
LW		 438 }
439 }
440 else
11343788 441 o->op_next = o;
79072805 442
11343788 443 return o->op_next;
79072805
LW		 444}
445
446OP *
864dbfa3 447Perl_scalarkids(pTHX_ OP *o)
79072805
LW		 448{
449 OP *kid;
11343788
MB		 450 if (o && o->op_flags & OPf_KIDS) {
451 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 452 scalar(kid);
453 }
11343788 454 return o;
79072805
LW		 455}
456
76e3520e 457STATIC OP *
cea2e8a9 458S_scalarboolean(pTHX_ OP *o)
8990e307 459{
d008e5eb 460 if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
d008e5eb 461 if (ckWARN(WARN_SYNTAX)) {
57843af0 462 line_t oldline = CopLINE(PL_curcop);
a0d0e21e 463
d008e5eb 464 if (PL_copline != NOLINE)
57843af0 465 CopLINE_set(PL_curcop, PL_copline);
9014280d 466 Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Found = in conditional, should be ==");
57843af0 467 CopLINE_set(PL_curcop, oldline);
d008e5eb 468 }
a0d0e21e 469 }
11343788 470 return scalar(o);
8990e307
LW		 471}
472
473OP *
864dbfa3 474Perl_scalar(pTHX_ OP *o)
79072805
LW		 475{
476 OP *kid;
477
a0d0e21e 478 /* assumes no premature commitment */
3280af22 479 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 480 || o->op_type == OP_RETURN)
7e363e51 481 {
11343788 482 return o;
7e363e51 483 }
79072805 484
5dc0d613 485 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 486
11343788 487 switch (o->op_type) {
79072805 488 case OP_REPEAT:
11343788 489 scalar(cBINOPo->op_first);
8990e307 490 break;
79072805
LW		 491 case OP_OR:
492 case OP_AND:
493 case OP_COND_EXPR:
11343788 494 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 495 scalar(kid);
79072805 496 break;
a0d0e21e 497 case OP_SPLIT:
11343788 498 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e 499 if (!kPMOP->op_pmreplroot)
12bcd1a6 500 deprecate_old("implicit split to @_");
a0d0e21e
LW		 501 }
502 /* FALL THROUGH */
79072805 503 case OP_MATCH:
8782bef2 504 case OP_QR:
79072805
LW		 505 case OP_SUBST:
506 case OP_NULL:
8990e307 507 default:
11343788
MB		 508 if (o->op_flags & OPf_KIDS) {
509 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 510 scalar(kid);
511 }
79072805
LW		 512 break;
513 case OP_LEAVE:
514 case OP_LEAVETRY:
5dc0d613 515 kid = cLISTOPo->op_first;
54310121 516 scalar(kid);
155aba94 517 while ((kid = kid->op_sibling)) {
54310121 518 if (kid->op_sibling)
519 scalarvoid(kid);
520 else
521 scalar(kid);
522 }
3280af22 523 WITH_THR(PL_curcop = &PL_compiling);
54310121 524 break;
748a9306 525 case OP_SCOPE:
79072805 526 case OP_LINESEQ:
8990e307 527 case OP_LIST:
11343788 528 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 529 if (kid->op_sibling)
530 scalarvoid(kid);
531 else
532 scalar(kid);
533 }
3280af22 534 WITH_THR(PL_curcop = &PL_compiling);
79072805 535 break;
a801c63c
RGS		 536 case OP_SORT:
537 if (ckWARN(WARN_VOID))
9014280d 538 Perl_warner(aTHX_ packWARN(WARN_VOID), "Useless use of sort in scalar context");
79072805 539 }
11343788 540 return o;
79072805
LW		 541}
542
543OP *
864dbfa3 544Perl_scalarvoid(pTHX_ OP *o)
79072805
LW		 545{
546 OP *kid;
8990e307
LW		 547 char* useless = 0;
548 SV* sv;
2ebea0a1
GS		 549 U8 want;
550
acb36ea4
GS		 551 if (o->op_type == OP_NEXTSTATE
552 || o->op_type == OP_SETSTATE
553 || o->op_type == OP_DBSTATE
554 || (o->op_type == OP_NULL && (o->op_targ == OP_NEXTSTATE
555 || o->op_targ == OP_SETSTATE
556 || o->op_targ == OP_DBSTATE)))
2ebea0a1 557 PL_curcop = (COP*)o; /* for warning below */
79072805 558
54310121 559 /* assumes no premature commitment */
2ebea0a1
GS		 560 want = o->op_flags & OPf_WANT;
561 if ((want && want != OPf_WANT_SCALAR) || PL_error_count
5dc0d613 562 || o->op_type == OP_RETURN)
7e363e51 563 {
11343788 564 return o;
7e363e51 565 }
79072805 566
b162f9ea 567 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 568 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
569 {
b162f9ea 570 return scalar(o); /* As if inside SASSIGN */
7e363e51 571 }
1c846c1f 572
5dc0d613 573 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 574
11343788 575 switch (o->op_type) {
79072805 576 default:
22c35a8c 577 if (!(PL_opargs[o->op_type] & OA_FOLDCONST))
8990e307 578 break;
36477c24 579 /* FALL THROUGH */
580 case OP_REPEAT:
11343788 581 if (o->op_flags & OPf_STACKED)
8990e307 582 break;
5d82c453
GA		 583 goto func_ops;
584 case OP_SUBSTR:
585 if (o->op_private == 4)
586 break;
8990e307
LW		 587 /* FALL THROUGH */
588 case OP_GVSV:
589 case OP_WANTARRAY:
590 case OP_GV:
591 case OP_PADSV:
592 case OP_PADAV:
593 case OP_PADHV:
594 case OP_PADANY:
595 case OP_AV2ARYLEN:
8990e307 596 case OP_REF:
a0d0e21e
LW		 597 case OP_REFGEN:
598 case OP_SREFGEN:
8990e307
LW		 599 case OP_DEFINED:
600 case OP_HEX:
601 case OP_OCT:
602 case OP_LENGTH:
8990e307
LW		 603 case OP_VEC:
604 case OP_INDEX:
605 case OP_RINDEX:
606 case OP_SPRINTF:
607 case OP_AELEM:
608 case OP_AELEMFAST:
609 case OP_ASLICE:
8990e307
LW		 610 case OP_HELEM:
611 case OP_HSLICE:
612 case OP_UNPACK:
613 case OP_PACK:
8990e307
LW		 614 case OP_JOIN:
615 case OP_LSLICE:
616 case OP_ANONLIST:
617 case OP_ANONHASH:
618 case OP_SORT:
619 case OP_REVERSE:
620 case OP_RANGE:
621 case OP_FLIP:
622 case OP_FLOP:
623 case OP_CALLER:
624 case OP_FILENO:
625 case OP_EOF:
626 case OP_TELL:
627 case OP_GETSOCKNAME:
628 case OP_GETPEERNAME:
629 case OP_READLINK:
630 case OP_TELLDIR:
631 case OP_GETPPID:
632 case OP_GETPGRP:
633 case OP_GETPRIORITY:
634 case OP_TIME:
635 case OP_TMS:
636 case OP_LOCALTIME:
637 case OP_GMTIME:
638 case OP_GHBYNAME:
639 case OP_GHBYADDR:
640 case OP_GHOSTENT:
641 case OP_GNBYNAME:
642 case OP_GNBYADDR:
643 case OP_GNETENT:
644 case OP_GPBYNAME:
645 case OP_GPBYNUMBER:
646 case OP_GPROTOENT:
647 case OP_GSBYNAME:
648 case OP_GSBYPORT:
649 case OP_GSERVENT:
650 case OP_GPWNAM:
651 case OP_GPWUID:
652 case OP_GGRNAM:
653 case OP_GGRGID:
654 case OP_GETLOGIN:
78e1b766 655 case OP_PROTOTYPE:
5d82c453 656 func_ops:
64aac5a9 657 if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO)))
53e06cf0 658 useless = OP_DESC(o);
8990e307
LW		 659 break;
660
661 case OP_RV2GV:
662 case OP_RV2SV:
663 case OP_RV2AV:
664 case OP_RV2HV:
192587c2 665 if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO)) &&
11343788 666 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 667 useless = "a variable";
668 break;
79072805
LW		 669
670 case OP_CONST:
7766f137 671 sv = cSVOPo_sv;
7a52d87a
GS		 672 if (cSVOPo->op_private & OPpCONST_STRICT)
673 no_bareword_allowed(o);
674 else {
d008e5eb
GS		 675 if (ckWARN(WARN_VOID)) {
676 useless = "a constant";
960b4253
MG		 677 /* the constants 0 and 1 are permitted as they are
678 conventionally used as dummies in constructs like
679 1 while some_condition_with_side_effects; */
d008e5eb
GS		 680 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
681 useless = 0;
682 else if (SvPOK(sv)) {
a52fe3ac
A		 683 /* perl4's way of mixing documentation and code
684 (before the invention of POD) was based on a
685 trick to mix nroff and perl code. The trick was
686 built upon these three nroff macros being used in
687 void context. The pink camel has the details in
688 the script wrapman near page 319. */
d008e5eb
GS		 689 if (strnEQ(SvPVX(sv), "di", 2) ||
690 strnEQ(SvPVX(sv), "ds", 2) ||
691 strnEQ(SvPVX(sv), "ig", 2))
692 useless = 0;
693 }
8990e307
LW		 694 }
695 }
93c66552 696 op_null(o); /* don't execute or even remember it */
79072805
LW		 697 break;
698
699 case OP_POSTINC:
11343788 700 o->op_type = OP_PREINC; /* pre-increment is faster */
22c35a8c 701 o->op_ppaddr = PL_ppaddr[OP_PREINC];
79072805
LW		 702 break;
703
704 case OP_POSTDEC:
11343788 705 o->op_type = OP_PREDEC; /* pre-decrement is faster */
22c35a8c 706 o->op_ppaddr = PL_ppaddr[OP_PREDEC];
79072805
LW		 707 break;
708
79072805
LW		 709 case OP_OR:
710 case OP_AND:
c963b151 711 case OP_DOR:
79072805 712 case OP_COND_EXPR:
11343788 713 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 714 scalarvoid(kid);
715 break;
5aabfad6 716
a0d0e21e 717 case OP_NULL:
11343788 718 if (o->op_flags & OPf_STACKED)
a0d0e21e 719 break;
5aabfad6 720 /* FALL THROUGH */
2ebea0a1
GS		 721 case OP_NEXTSTATE:
722 case OP_DBSTATE:
79072805
LW		 723 case OP_ENTERTRY:
724 case OP_ENTER:
11343788 725 if (!(o->op_flags & OPf_KIDS))
79072805 726 break;
54310121 727 /* FALL THROUGH */
463ee0b2 728 case OP_SCOPE:
79072805
LW		 729 case OP_LEAVE:
730 case OP_LEAVETRY:
a0d0e21e 731 case OP_LEAVELOOP:
79072805 732 case OP_LINESEQ:
79072805 733 case OP_LIST:
11343788 734 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 735 scalarvoid(kid);
736 break;
c90c0ff4 737 case OP_ENTEREVAL:
5196be3e 738 scalarkids(o);
c90c0ff4 739 break;
5aabfad6 740 case OP_REQUIRE:
c90c0ff4 741 /* all requires must return a boolean value */
5196be3e 742 o->op_flags &= ~OPf_WANT;
d6483035
GS		 743 /* FALL THROUGH */
744 case OP_SCALAR:
5196be3e 745 return scalar(o);
a0d0e21e 746 case OP_SPLIT:
11343788 747 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e 748 if (!kPMOP->op_pmreplroot)
12bcd1a6 749 deprecate_old("implicit split to @_");
a0d0e21e
LW		 750 }
751 break;
79072805 752 }
411caa50 753 if (useless && ckWARN(WARN_VOID))
9014280d 754 Perl_warner(aTHX_ packWARN(WARN_VOID), "Useless use of %s in void context", useless);
11343788 755 return o;
79072805
LW		 756}
757
758OP *
864dbfa3 759Perl_listkids(pTHX_ OP *o)
79072805
LW		 760{
761 OP *kid;
11343788
MB		 762 if (o && o->op_flags & OPf_KIDS) {
763 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 764 list(kid);
765 }
11343788 766 return o;
79072805
LW		 767}
768
769OP *
864dbfa3 770Perl_list(pTHX_ OP *o)
79072805
LW		 771{
772 OP *kid;
773
a0d0e21e 774 /* assumes no premature commitment */
3280af22 775 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 776 || o->op_type == OP_RETURN)
7e363e51 777 {
11343788 778 return o;
7e363e51 779 }
79072805 780
b162f9ea 781 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 782 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
783 {
b162f9ea 784 return o; /* As if inside SASSIGN */
7e363e51 785 }
1c846c1f 786
5dc0d613 787 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 788
11343788 789 switch (o->op_type) {
79072805
LW		 790 case OP_FLOP:
791 case OP_REPEAT:
11343788 792 list(cBINOPo->op_first);
79072805
LW		 793 break;
794 case OP_OR:
795 case OP_AND:
796 case OP_COND_EXPR:
11343788 797 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 798 list(kid);
799 break;
800 default:
801 case OP_MATCH:
8782bef2 802 case OP_QR:
79072805
LW		 803 case OP_SUBST:
804 case OP_NULL:
11343788 805 if (!(o->op_flags & OPf_KIDS))
79072805 806 break;
11343788
MB		 807 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
808 list(cBINOPo->op_first);
809 return gen_constant_list(o);
79072805
LW		 810 }
811 case OP_LIST:
11343788 812 listkids(o);
79072805
LW		 813 break;
814 case OP_LEAVE:
815 case OP_LEAVETRY:
5dc0d613 816 kid = cLISTOPo->op_first;
54310121 817 list(kid);
155aba94 818 while ((kid = kid->op_sibling)) {
54310121 819 if (kid->op_sibling)
820 scalarvoid(kid);
821 else
822 list(kid);
823 }
3280af22 824 WITH_THR(PL_curcop = &PL_compiling);
54310121 825 break;
748a9306 826 case OP_SCOPE:
79072805 827 case OP_LINESEQ:
11343788 828 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 829 if (kid->op_sibling)
830 scalarvoid(kid);
831 else
832 list(kid);
833 }
3280af22 834 WITH_THR(PL_curcop = &PL_compiling);
79072805 835 break;
c90c0ff4 836 case OP_REQUIRE:
837 /* all requires must return a boolean value */
5196be3e
MB		 838 o->op_flags &= ~OPf_WANT;
839 return scalar(o);
79072805 840 }
11343788 841 return o;
79072805
LW		 842}
843
844OP *
864dbfa3 845Perl_scalarseq(pTHX_ OP *o)
79072805
LW		 846{
847 OP *kid;
848
11343788
MB		 849 if (o) {
850 if (o->op_type == OP_LINESEQ ||
851 o->op_type == OP_SCOPE ||
852 o->op_type == OP_LEAVE ||
853 o->op_type == OP_LEAVETRY)
463ee0b2 854 {
11343788 855 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 856 if (kid->op_sibling) {
463ee0b2 857 scalarvoid(kid);
ed6116ce 858 }
463ee0b2 859 }
3280af22 860 PL_curcop = &PL_compiling;
79072805 861 }
11343788 862 o->op_flags &= ~OPf_PARENS;
3280af22 863 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 864 o->op_flags |= OPf_PARENS;
79072805 865 }
8990e307 866 else
11343788
MB		 867 o = newOP(OP_STUB, 0);
868 return o;
79072805
LW		 869}
870
76e3520e 871STATIC OP *
cea2e8a9 872S_modkids(pTHX_ OP *o, I32 type)
79072805
LW		 873{
874 OP *kid;
11343788
MB		 875 if (o && o->op_flags & OPf_KIDS) {
876 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 877 mod(kid, type);
79072805 878 }
11343788 879 return o;
79072805
LW		 880}
881
ddeae0f1
DM		 882/* Propagate lvalue ("modifiable") context to an op and it's children.
883 * 'type' represents the context type, roughly based on the type of op that
884 * would do the modifying, although local() is represented by OP_NULL.
885 * It's responsible for detecting things that can't be modified, flag
886 * things that need to behave specially in an lvalue context (e.g., "$$x = 5"
887 * might have to vivify a reference in $x), and so on.
888 *
889 * For example, "$a+1 = 2" would cause mod() to be called with o being
890 * OP_ADD and type being OP_SASSIGN, and would output an error.
891 */
892
79072805 893OP *
864dbfa3 894Perl_mod(pTHX_ OP *o, I32 type)
79072805
LW		 895{
896 OP *kid;
ddeae0f1
DM		 897 /* -1 = error on localize, 0 = ignore localize, 1 = ok to localize */
898 int localize = -1;
79072805 899
3280af22 900 if (!o || PL_error_count)
11343788 901 return o;
79072805 902
b162f9ea 903 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 904 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
905 {
b162f9ea 906 return o;
7e363e51 907 }
1c846c1f 908
11343788 909 switch (o->op_type) {
68dc0745 910 case OP_UNDEF:
ddeae0f1 911 localize = 0;
3280af22 912 PL_modcount++;
5dc0d613 913 return o;
a0d0e21e 914 case OP_CONST:
11343788 915 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e 916 goto nomod;
3280af22 917 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
7766f137 918 PL_compiling.cop_arybase = (I32)SvIV(cSVOPx(PL_eval_start)->op_sv);
3280af22 919 PL_eval_start = 0;
a0d0e21e
LW		 920 }
921 else if (!type) {
3280af22
NIS		 922 SAVEI32(PL_compiling.cop_arybase);
923 PL_compiling.cop_arybase = 0;
a0d0e21e
LW		 924 }
925 else if (type == OP_REFGEN)
926 goto nomod;
927 else
cea2e8a9 928 Perl_croak(aTHX_ "That use of $[ is unsupported");
a0d0e21e 929 break;
5f05dabc 930 case OP_STUB:
5196be3e 931 if (o->op_flags & OPf_PARENS)
5f05dabc 932 break;
933 goto nomod;
a0d0e21e
LW		 934 case OP_ENTERSUB:
935 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 936 !(o->op_flags & OPf_STACKED)) {
937 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 938 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788 939 assert(cUNOPo->op_first->op_type == OP_NULL);
93c66552 940 op_null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 941 break;
942 }
95f0a2f1
SB		 943 else if (o->op_private & OPpENTERSUB_NOMOD)
944 return o;
cd06dffe
GS		 945 else { /* lvalue subroutine call */
946 o->op_private |= OPpLVAL_INTRO;
e6438c1a 947 PL_modcount = RETURN_UNLIMITED_NUMBER;
4978d6d9 948 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN) {
cd06dffe
GS		 949 /* Backward compatibility mode: */
950 o->op_private |= OPpENTERSUB_INARGS;
951 break;
952 }
953 else { /* Compile-time error message: */
954 OP *kid = cUNOPo->op_first;
955 CV *cv;
956 OP *okid;
957
958 if (kid->op_type == OP_PUSHMARK)
959 goto skip_kids;
960 if (kid->op_type != OP_NULL || kid->op_targ != OP_LIST)
961 Perl_croak(aTHX_
962 "panic: unexpected lvalue entersub "
55140b79 963 "args: type/targ %ld:%"UVuf,
3d811634 964 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 965 kid = kLISTOP->op_first;
966 skip_kids:
967 while (kid->op_sibling)
968 kid = kid->op_sibling;
969 if (!(kid->op_type == OP_NULL && kid->op_targ == OP_RV2CV)) {
970 /* Indirect call */
971 if (kid->op_type == OP_METHOD_NAMED
972 || kid->op_type == OP_METHOD)
973 {
87d7fd28 974 UNOP *newop;
b2ffa427 975
87d7fd28 976 NewOp(1101, newop, 1, UNOP);
349fd7b7
GS		 977 newop->op_type = OP_RV2CV;
978 newop->op_ppaddr = PL_ppaddr[OP_RV2CV];
87d7fd28
GS		 979 newop->op_first = Nullop;
980 newop->op_next = (OP*)newop;
981 kid->op_sibling = (OP*)newop;
349fd7b7 982 newop->op_private |= OPpLVAL_INTRO;
cd06dffe
GS		 983 break;
984 }
b2ffa427 985
cd06dffe
GS		 986 if (kid->op_type != OP_RV2CV)
987 Perl_croak(aTHX_
988 "panic: unexpected lvalue entersub "
55140b79 989 "entry via type/targ %ld:%"UVuf,
3d811634 990 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 991 kid->op_private |= OPpLVAL_INTRO;
992 break; /* Postpone until runtime */
993 }
b2ffa427
NIS		 994
995 okid = kid;
cd06dffe
GS		 996 kid = kUNOP->op_first;
997 if (kid->op_type == OP_NULL && kid->op_targ == OP_RV2SV)
998 kid = kUNOP->op_first;
b2ffa427 999 if (kid->op_type == OP_NULL)
cd06dffe
GS		 1000 Perl_croak(aTHX_
1001 "Unexpected constant lvalue entersub "
55140b79 1002 "entry via type/targ %ld:%"UVuf,
3d811634 1003 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1004 if (kid->op_type != OP_GV) {
1005 /* Restore RV2CV to check lvalueness */
1006 restore_2cv:
1007 if (kid->op_next && kid->op_next != kid) { /* Happens? */
1008 okid->op_next = kid->op_next;
1009 kid->op_next = okid;
1010 }
1011 else
1012 okid->op_next = Nullop;
1013 okid->op_type = OP_RV2CV;
1014 okid->op_targ = 0;
1015 okid->op_ppaddr = PL_ppaddr[OP_RV2CV];
1016 okid->op_private |= OPpLVAL_INTRO;
1017 break;
1018 }
b2ffa427 1019
638eceb6 1020 cv = GvCV(kGVOP_gv);
1c846c1f 1021 if (!cv)
cd06dffe
GS		 1022 goto restore_2cv;
1023 if (CvLVALUE(cv))
1024 break;
1025 }
1026 }
79072805
LW		 1027 /* FALL THROUGH */
1028 default:
a0d0e21e
LW		 1029 nomod:
1030 /* grep, foreach, subcalls, refgen */
1031 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1032 break;
cea2e8a9 1033 yyerror(Perl_form(aTHX_ "Can't modify %s in %s",
638bc118 1034 (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
cd06dffe
GS		 1035 ? "do block"
1036 : (o->op_type == OP_ENTERSUB
1037 ? "non-lvalue subroutine call"
53e06cf0 1038 : OP_DESC(o))),
22c35a8c 1039 type ? PL_op_desc[type] : "local"));
11343788 1040 return o;
79072805 1041
a0d0e21e
LW		 1042 case OP_PREINC:
1043 case OP_PREDEC:
1044 case OP_POW:
1045 case OP_MULTIPLY:
1046 case OP_DIVIDE:
1047 case OP_MODULO:
1048 case OP_REPEAT:
1049 case OP_ADD:
1050 case OP_SUBTRACT:
1051 case OP_CONCAT:
1052 case OP_LEFT_SHIFT:
1053 case OP_RIGHT_SHIFT:
1054 case OP_BIT_AND:
1055 case OP_BIT_XOR:
1056 case OP_BIT_OR:
1057 case OP_I_MULTIPLY:
1058 case OP_I_DIVIDE:
1059 case OP_I_MODULO:
1060 case OP_I_ADD:
1061 case OP_I_SUBTRACT:
11343788 1062 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1063 goto nomod;
3280af22 1064 PL_modcount++;
a0d0e21e 1065 break;
b2ffa427 1066
79072805 1067 case OP_COND_EXPR:
ddeae0f1 1068 localize = 1;
11343788 1069 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1070 mod(kid, type);
79072805
LW		 1071 break;
1072
1073 case OP_RV2AV:
1074 case OP_RV2HV:
11343788 1075 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
e6438c1a 1076 PL_modcount = RETURN_UNLIMITED_NUMBER;
11343788 1077 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1078 }
1079 /* FALL THROUGH */
79072805 1080 case OP_RV2GV:
5dc0d613 1081 if (scalar_mod_type(o, type))
3fe9a6f1 1082 goto nomod;
11343788 1083 ref(cUNOPo->op_first, o->op_type);
79072805 1084 /* FALL THROUGH */
79072805
LW		 1085 case OP_ASLICE:
1086 case OP_HSLICE:
78f9721b
SM		 1087 if (type == OP_LEAVESUBLV)
1088 o->op_private |= OPpMAYBE_LVSUB;
ddeae0f1 1089 localize = 1;
78f9721b
SM		 1090 /* FALL THROUGH */
1091 case OP_AASSIGN:
93a17b20
LW		 1092 case OP_NEXTSTATE:
1093 case OP_DBSTATE:
e6438c1a 1094 PL_modcount = RETURN_UNLIMITED_NUMBER;
79072805 1095 break;
463ee0b2 1096 case OP_RV2SV:
aeea060c 1097 ref(cUNOPo->op_first, o->op_type);
ddeae0f1 1098 localize = 1;
463ee0b2 1099 /* FALL THROUGH */
79072805 1100 case OP_GV:
463ee0b2 1101 case OP_AV2ARYLEN:
3280af22 1102 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1103 case OP_SASSIGN:
bf4b1e52
GS		 1104 case OP_ANDASSIGN:
1105 case OP_ORASSIGN:
c963b151 1106 case OP_DORASSIGN:
ddeae0f1
DM		 1107 PL_modcount++;
1108 break;
1109
8990e307 1110 case OP_AELEMFAST:
ddeae0f1 1111 localize = 1;
3280af22 1112 PL_modcount++;
8990e307
LW		 1113 break;
1114
748a9306
LW		 1115 case OP_PADAV:
1116 case OP_PADHV:
e6438c1a 1117 PL_modcount = RETURN_UNLIMITED_NUMBER;
5196be3e
MB		 1118 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1119 return o; /* Treat \(@foo) like ordinary list. */
1120 if (scalar_mod_type(o, type))
3fe9a6f1 1121 goto nomod;
78f9721b
SM		 1122 if (type == OP_LEAVESUBLV)
1123 o->op_private |= OPpMAYBE_LVSUB;
748a9306
LW		 1124 /* FALL THROUGH */
1125 case OP_PADSV:
3280af22 1126 PL_modcount++;
ddeae0f1 1127 if (!type) /* local() */
cea2e8a9 1128 Perl_croak(aTHX_ "Can't localize lexical variable %s",
dd2155a4 1129 PAD_COMPNAME_PV(o->op_targ));
463ee0b2
LW		 1130 break;
1131
748a9306 1132 case OP_PUSHMARK:
ddeae0f1 1133 localize = 0;
748a9306 1134 break;
b2ffa427 1135
69969c6f
SB		 1136 case OP_KEYS:
1137 if (type != OP_SASSIGN)
1138 goto nomod;
5d82c453
GA		 1139 goto lvalue_func;
1140 case OP_SUBSTR:
1141 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1142 goto nomod;
5f05dabc 1143 /* FALL THROUGH */
a0d0e21e 1144 case OP_POS:
463ee0b2 1145 case OP_VEC:
78f9721b
SM		 1146 if (type == OP_LEAVESUBLV)
1147 o->op_private |= OPpMAYBE_LVSUB;
5d82c453 1148 lvalue_func:
11343788
MB		 1149 pad_free(o->op_targ);
1150 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1151 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1152 if (o->op_flags & OPf_KIDS)
1153 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1154 break;
a0d0e21e 1155
463ee0b2
LW		 1156 case OP_AELEM:
1157 case OP_HELEM:
11343788 1158 ref(cBINOPo->op_first, o->op_type);
68dc0745 1159 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1160 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1161 o->op_private |= OPpLVAL_DEFER;
78f9721b
SM		 1162 if (type == OP_LEAVESUBLV)
1163 o->op_private |= OPpMAYBE_LVSUB;
ddeae0f1 1164 localize = 1;
3280af22 1165 PL_modcount++;
463ee0b2
LW		 1166 break;
1167
1168 case OP_SCOPE:
1169 case OP_LEAVE:
1170 case OP_ENTER:
78f9721b 1171 case OP_LINESEQ:
ddeae0f1 1172 localize = 0;
11343788
MB		 1173 if (o->op_flags & OPf_KIDS)
1174 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1175 break;
1176
1177 case OP_NULL:
ddeae0f1 1178 localize = 0;
638bc118
GS		 1179 if (o->op_flags & OPf_SPECIAL) /* do BLOCK */
1180 goto nomod;
1181 else if (!(o->op_flags & OPf_KIDS))
463ee0b2 1182 break;
11343788
MB		 1183 if (o->op_targ != OP_LIST) {
1184 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1185 break;
1186 }
1187 /* FALL THROUGH */
463ee0b2 1188 case OP_LIST:
ddeae0f1 1189 localize = 0;
11343788 1190 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1191 mod(kid, type);
1192 break;
78f9721b
SM		 1193
1194 case OP_RETURN:
1195 if (type != OP_LEAVESUBLV)
1196 goto nomod;
1197 break; /* mod()ing was handled by ck_return() */
463ee0b2 1198 }
58d95175 1199
8be1be90
AMS		 1200 /* [20011101.069] File test operators interpret OPf_REF to mean that
1201 their argument is a filehandle; thus \stat(".") should not set
1202 it. AMS 20011102 */
1203 if (type == OP_REFGEN &&
1204 PL_check[o->op_type] == MEMBER_TO_FPTR(Perl_ck_ftst))
1205 return o;
1206
1207 if (type != OP_LEAVESUBLV)
1208 o->op_flags |= OPf_MOD;
1209
1210 if (type == OP_AASSIGN || type == OP_SASSIGN)
1211 o->op_flags |= OPf_SPECIAL|OPf_REF;
ddeae0f1
DM		 1212 else if (!type) { /* local() */
1213 switch (localize) {
1214 case 1:
1215 o->op_private |= OPpLVAL_INTRO;
1216 o->op_flags &= ~OPf_SPECIAL;
1217 PL_hints |= HINT_BLOCK_SCOPE;
1218 break;
1219 case 0:
1220 break;
1221 case -1:
1222 if (ckWARN(WARN_SYNTAX)) {
1223 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
1224 "Useless localization of %s", OP_DESC(o));
1225 }
1226 }
463ee0b2 1227 }
8be1be90
AMS		 1228 else if (type != OP_GREPSTART && type != OP_ENTERSUB
1229 && type != OP_LEAVESUBLV)
1230 o->op_flags |= OPf_REF;
11343788 1231 return o;
463ee0b2
LW		 1232}
1233
864dbfa3 1234STATIC bool
cea2e8a9 1235S_scalar_mod_type(pTHX_ OP *o, I32 type)
3fe9a6f1 1236{
1237 switch (type) {
1238 case OP_SASSIGN:
5196be3e 1239 if (o->op_type == OP_RV2GV)
3fe9a6f1 1240 return FALSE;
1241 /* FALL THROUGH */
1242 case OP_PREINC:
1243 case OP_PREDEC:
1244 case OP_POSTINC:
1245 case OP_POSTDEC:
1246 case OP_I_PREINC:
1247 case OP_I_PREDEC:
1248 case OP_I_POSTINC:
1249 case OP_I_POSTDEC:
1250 case OP_POW:
1251 case OP_MULTIPLY:
1252 case OP_DIVIDE:
1253 case OP_MODULO:
1254 case OP_REPEAT:
1255 case OP_ADD:
1256 case OP_SUBTRACT:
1257 case OP_I_MULTIPLY:
1258 case OP_I_DIVIDE:
1259 case OP_I_MODULO:
1260 case OP_I_ADD:
1261 case OP_I_SUBTRACT:
1262 case OP_LEFT_SHIFT:
1263 case OP_RIGHT_SHIFT:
1264 case OP_BIT_AND:
1265 case OP_BIT_XOR:
1266 case OP_BIT_OR:
1267 case OP_CONCAT:
1268 case OP_SUBST:
1269 case OP_TRANS:
49e9fbe6
GS		 1270 case OP_READ:
1271 case OP_SYSREAD:
1272 case OP_RECV:
bf4b1e52
GS		 1273 case OP_ANDASSIGN:
1274 case OP_ORASSIGN:
3fe9a6f1 1275 return TRUE;
1276 default:
1277 return FALSE;
1278 }
1279}
1280
35cd451c 1281STATIC bool
cea2e8a9 1282S_is_handle_constructor(pTHX_ OP *o, I32 argnum)
35cd451c
GS		 1283{
1284 switch (o->op_type) {
1285 case OP_PIPE_OP:
1286 case OP_SOCKPAIR:
1287 if (argnum == 2)
1288 return TRUE;
1289 /* FALL THROUGH */
1290 case OP_SYSOPEN:
1291 case OP_OPEN:
ded8aa31 1292 case OP_SELECT: /* XXX c.f. SelectSaver.pm */
35cd451c
GS		 1293 case OP_SOCKET:
1294 case OP_OPEN_DIR:
1295 case OP_ACCEPT:
1296 if (argnum == 1)
1297 return TRUE;
1298 /* FALL THROUGH */
1299 default:
1300 return FALSE;
1301 }
1302}
1303
463ee0b2 1304OP *
864dbfa3 1305Perl_refkids(pTHX_ OP *o, I32 type)
463ee0b2
LW		 1306{
1307 OP *kid;
11343788
MB		 1308 if (o && o->op_flags & OPf_KIDS) {
1309 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1310 ref(kid, type);
1311 }
11343788 1312 return o;
463ee0b2
LW		 1313}
1314
1315OP *
864dbfa3 1316Perl_ref(pTHX_ OP *o, I32 type)
463ee0b2
LW		 1317{
1318 OP *kid;
463ee0b2 1319
3280af22 1320 if (!o || PL_error_count)
11343788 1321 return o;
463ee0b2 1322
11343788 1323 switch (o->op_type) {
a0d0e21e 1324 case OP_ENTERSUB:
afebc493 1325 if ((type == OP_EXISTS || type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1326 !(o->op_flags & OPf_STACKED)) {
1327 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1328 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788 1329 assert(cUNOPo->op_first->op_type == OP_NULL);
93c66552 1330 op_null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
11343788 1331 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1332 }
1333 break;
aeea060c 1334
463ee0b2 1335 case OP_COND_EXPR:
11343788 1336 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1337 ref(kid, type);
1338 break;
8990e307 1339 case OP_RV2SV:
35cd451c
GS		 1340 if (type == OP_DEFINED)
1341 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1342 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1343 /* FALL THROUGH */
1344 case OP_PADSV:
5f05dabc 1345 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1346 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1347 : type == OP_RV2HV ? OPpDEREF_HV
1348 : OPpDEREF_SV);
11343788 1349 o->op_flags |= OPf_MOD;
a0d0e21e 1350 }
8990e307 1351 break;
1c846c1f 1352
2faa37cc 1353 case OP_THREADSV:
a863c7d1
MB		 1354 o->op_flags |= OPf_MOD; /* XXX ??? */
1355 break;
1356
463ee0b2
LW		 1357 case OP_RV2AV:
1358 case OP_RV2HV:
aeea060c 1359 o->op_flags |= OPf_REF;
8990e307 1360 /* FALL THROUGH */
463ee0b2 1361 case OP_RV2GV:
35cd451c
GS		 1362 if (type == OP_DEFINED)
1363 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1364 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1365 break;
8990e307 1366
463ee0b2
LW		 1367 case OP_PADAV:
1368 case OP_PADHV:
aeea060c 1369 o->op_flags |= OPf_REF;
79072805 1370 break;
aeea060c 1371
8990e307 1372 case OP_SCALAR:
79072805 1373 case OP_NULL:
11343788 1374 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1375 break;
11343788 1376 ref(cBINOPo->op_first, type);
79072805
LW		 1377 break;
1378 case OP_AELEM:
1379 case OP_HELEM:
11343788 1380 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1381 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1382 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1383 : type == OP_RV2HV ? OPpDEREF_HV
1384 : OPpDEREF_SV);
11343788 1385 o->op_flags |= OPf_MOD;
8990e307 1386 }
79072805
LW		 1387 break;
1388
463ee0b2 1389 case OP_SCOPE:
79072805
LW		 1390 case OP_LEAVE:
1391 case OP_ENTER:
8990e307 1392 case OP_LIST:
11343788 1393 if (!(o->op_flags & OPf_KIDS))
79072805 1394 break;
11343788 1395 ref(cLISTOPo->op_last, type);
79072805 1396 break;
a0d0e21e
LW		 1397 default:
1398 break;
79072805 1399 }
11343788 1400 return scalar(o);
8990e307 1401
79072805
LW		 1402}
1403
09bef843
SB		 1404STATIC OP *
1405S_dup_attrlist(pTHX_ OP *o)
1406{
1407 OP *rop = Nullop;
1408
1409 /* An attrlist is either a simple OP_CONST or an OP_LIST with kids,
1410 * where the first kid is OP_PUSHMARK and the remaining ones
1411 * are OP_CONST. We need to push the OP_CONST values.
1412 */
1413 if (o->op_type == OP_CONST)
1414 rop = newSVOP(OP_CONST, o->op_flags, SvREFCNT_inc(cSVOPo->op_sv));
1415 else {
1416 assert((o->op_type == OP_LIST) && (o->op_flags & OPf_KIDS));
1417 for (o = cLISTOPo->op_first; o; o=o->op_sibling) {
1418 if (o->op_type == OP_CONST)
1419 rop = append_elem(OP_LIST, rop,
1420 newSVOP(OP_CONST, o->op_flags,
1421 SvREFCNT_inc(cSVOPo->op_sv)));
1422 }
1423 }
1424 return rop;
1425}
1426
1427STATIC void
95f0a2f1 1428S_apply_attrs(pTHX_ HV *stash, SV *target, OP *attrs, bool for_my)
09bef843 1429{
09bef843
SB		 1430 SV *stashsv;
1431
1432 /* fake up C<use attributes $pkg,$rv,@attrs> */
1433 ENTER; /* need to protect against side-effects of 'use' */
1434 SAVEINT(PL_expect);
a9164de8 1435 if (stash)
09bef843
SB		 1436 stashsv = newSVpv(HvNAME(stash), 0);
1437 else
1438 stashsv = &PL_sv_no;
e4783991 1439
09bef843 1440#define ATTRSMODULE "attributes"
95f0a2f1
SB		 1441#define ATTRSMODULE_PM "attributes.pm"
1442
1443 if (for_my) {
1444 SV **svp;
1445 /* Don't force the C<use> if we don't need it. */
1446 svp = hv_fetch(GvHVn(PL_incgv), ATTRSMODULE_PM,
1447 sizeof(ATTRSMODULE_PM)-1, 0);
1448 if (svp && *svp != &PL_sv_undef)
1449 ; /* already in %INC */
1450 else
1451 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
1452 newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1),
1453 Nullsv);
1454 }
1455 else {
1456 Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS,
1457 newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1),
1458 Nullsv,
1459 prepend_elem(OP_LIST,
1460 newSVOP(OP_CONST, 0, stashsv),
1461 prepend_elem(OP_LIST,
1462 newSVOP(OP_CONST, 0,
1463 newRV(target)),
1464 dup_attrlist(attrs))));
1465 }
09bef843
SB		 1466 LEAVE;
1467}
1468
95f0a2f1
SB		 1469STATIC void
1470S_apply_attrs_my(pTHX_ HV *stash, OP *target, OP *attrs, OP **imopsp)
1471{
1472 OP *pack, *imop, *arg;
1473 SV *meth, *stashsv;
1474
1475 if (!attrs)
1476 return;
1477
1478 assert(target->op_type == OP_PADSV ||
1479 target->op_type == OP_PADHV ||
1480 target->op_type == OP_PADAV);
1481
1482 /* Ensure that attributes.pm is loaded. */
dd2155a4 1483 apply_attrs(stash, PAD_SV(target->op_targ), attrs, TRUE);
95f0a2f1
SB		 1484
1485 /* Need package name for method call. */
1486 pack = newSVOP(OP_CONST, 0, newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1));
1487
1488 /* Build up the real arg-list. */
1489 if (stash)
1490 stashsv = newSVpv(HvNAME(stash), 0);
1491 else
1492 stashsv = &PL_sv_no;
1493 arg = newOP(OP_PADSV, 0);
1494 arg->op_targ = target->op_targ;
1495 arg = prepend_elem(OP_LIST,
1496 newSVOP(OP_CONST, 0, stashsv),
1497 prepend_elem(OP_LIST,
1498 newUNOP(OP_REFGEN, 0,
1499 mod(arg, OP_REFGEN)),
1500 dup_attrlist(attrs)));
1501
1502 /* Fake up a method call to import */
1503 meth = newSVpvn("import", 6);
1504 (void)SvUPGRADE(meth, SVt_PVIV);
1505 (void)SvIOK_on(meth);
5afd6d42 1506 PERL_HASH(SvUVX(meth), SvPVX(meth), SvCUR(meth));
95f0a2f1
SB		 1507 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL|OPf_WANT_VOID,
1508 append_elem(OP_LIST,
1509 prepend_elem(OP_LIST, pack, list(arg)),
1510 newSVOP(OP_METHOD_NAMED, 0, meth)));
1511 imop->op_private |= OPpENTERSUB_NOMOD;
1512
1513 /* Combine the ops. */
1514 *imopsp = append_elem(OP_LIST, *imopsp, imop);
1515}
1516
1517/*
1518=notfor apidoc apply_attrs_string
1519
1520Attempts to apply a list of attributes specified by the C<attrstr> and
1521C<len> arguments to the subroutine identified by the C<cv> argument which
1522is expected to be associated with the package identified by the C<stashpv>
1523argument (see L<attributes>). It gets this wrong, though, in that it
1524does not correctly identify the boundaries of the individual attribute
1525specifications within C<attrstr>. This is not really intended for the
1526public API, but has to be listed here for systems such as AIX which
1527need an explicit export list for symbols. (It's called from XS code
1528in support of the C<ATTRS:> keyword from F<xsubpp>.) Patches to fix it
1529to respect attribute syntax properly would be welcome.
1530
1531=cut
1532*/
1533
be3174d2
GS		 1534void
1535Perl_apply_attrs_string(pTHX_ char *stashpv, CV *cv,
1536 char *attrstr, STRLEN len)
1537{
1538 OP *attrs = Nullop;
1539
1540 if (!len) {
1541 len = strlen(attrstr);
1542 }
1543
1544 while (len) {
1545 for (; isSPACE(*attrstr) && len; --len, ++attrstr) ;
1546 if (len) {
1547 char *sstr = attrstr;
1548 for (; !isSPACE(*attrstr) && len; --len, ++attrstr) ;
1549 attrs = append_elem(OP_LIST, attrs,
1550 newSVOP(OP_CONST, 0,
1551 newSVpvn(sstr, attrstr-sstr)));
1552 }
1553 }
1554
1555 Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS,
1556 newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1),
1557 Nullsv, prepend_elem(OP_LIST,
1558 newSVOP(OP_CONST, 0, newSVpv(stashpv,0)),
1559 prepend_elem(OP_LIST,
1560 newSVOP(OP_CONST, 0,
1561 newRV((SV*)cv)),
1562 attrs)));
1563}
1564
09bef843 1565STATIC OP *
95f0a2f1 1566S_my_kid(pTHX_ OP *o, OP *attrs, OP **imopsp)
93a17b20
LW		 1567{
1568 OP *kid;
93a17b20
LW		 1569 I32 type;
1570
3280af22 1571 if (!o || PL_error_count)
11343788 1572 return o;
93a17b20 1573
11343788 1574 type = o->op_type;
93a17b20 1575 if (type == OP_LIST) {
11343788 1576 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
95f0a2f1 1577 my_kid(kid, attrs, imopsp);
dab48698 1578 } else if (type == OP_UNDEF) {
7766148a 1579 return o;
77ca0c92
LW		 1580 } else if (type == OP_RV2SV || /* "our" declaration */
1581 type == OP_RV2AV ||
1582 type == OP_RV2HV) { /* XXX does this let anything illegal in? */
1ce0b88c
RGS		 1583 if (cUNOPo->op_first->op_type != OP_GV) { /* MJD 20011224 */
1584 yyerror(Perl_form(aTHX_ "Can't declare %s in %s",
1585 OP_DESC(o), PL_in_my == KEY_our ? "our" : "my"));
1586 } else if (attrs) {
1587 GV *gv = cGVOPx_gv(cUNOPo->op_first);
1588 PL_in_my = FALSE;
1589 PL_in_my_stash = Nullhv;
1590 apply_attrs(GvSTASH(gv),
1591 (type == OP_RV2SV ? GvSV(gv) :
1592 type == OP_RV2AV ? (SV*)GvAV(gv) :
1593 type == OP_RV2HV ? (SV*)GvHV(gv) : (SV*)gv),
1594 attrs, FALSE);
1595 }
192587c2 1596 o->op_private |= OPpOUR_INTRO;
77ca0c92 1597 return o;
95f0a2f1
SB		 1598 }
1599 else if (type != OP_PADSV &&
93a17b20
LW		 1600 type != OP_PADAV &&
1601 type != OP_PADHV &&
1602 type != OP_PUSHMARK)
1603 {
eb64745e 1604 yyerror(Perl_form(aTHX_ "Can't declare %s in \"%s\"",
53e06cf0 1605 OP_DESC(o),
eb64745e 1606 PL_in_my == KEY_our ? "our" : "my"));
11343788 1607 return o;
93a17b20 1608 }
09bef843
SB		 1609 else if (attrs && type != OP_PUSHMARK) {
1610 HV *stash;
09bef843 1611
eb64745e
GS		 1612 PL_in_my = FALSE;
1613 PL_in_my_stash = Nullhv;
1614
09bef843 1615 /* check for C<my Dog $spot> when deciding package */
dd2155a4
DM		 1616 stash = PAD_COMPNAME_TYPE(o->op_targ);
1617 if (!stash)
09bef843 1618 stash = PL_curstash;
95f0a2f1 1619 apply_attrs_my(stash, o, attrs, imopsp);
09bef843 1620 }
11343788
MB		 1621 o->op_flags |= OPf_MOD;
1622 o->op_private |= OPpLVAL_INTRO;
1623 return o;
93a17b20
LW		 1624}
1625
1626OP *
09bef843
SB		 1627Perl_my_attrs(pTHX_ OP *o, OP *attrs)
1628{
95f0a2f1
SB		 1629 OP *rops = Nullop;
1630 int maybe_scalar = 0;
1631
d2be0de5 1632/* [perl #17376]: this appears to be premature, and results in code such as
c754c3d7 1633 C< our(%x); > executing in list mode rather than void mode */
d2be0de5 1634#if 0
09bef843
SB		 1635 if (o->op_flags & OPf_PARENS)
1636 list(o);
95f0a2f1
SB		 1637 else
1638 maybe_scalar = 1;
d2be0de5
YST		 1639#else
1640 maybe_scalar = 1;
1641#endif
09bef843
SB		 1642 if (attrs)
1643 SAVEFREEOP(attrs);
95f0a2f1
SB		 1644 o = my_kid(o, attrs, &rops);
1645 if (rops) {
1646 if (maybe_scalar && o->op_type == OP_PADSV) {
1647 o = scalar(append_list(OP_LIST, (LISTOP*)rops, (LISTOP*)o));
1648 o->op_private |= OPpLVAL_INTRO;
1649 }
1650 else
1651 o = append_list(OP_LIST, (LISTOP*)o, (LISTOP*)rops);
1652 }
eb64745e
GS		 1653 PL_in_my = FALSE;
1654 PL_in_my_stash = Nullhv;
1655 return o;
09bef843
SB		 1656}
1657
1658OP *
1659Perl_my(pTHX_ OP *o)
1660{
95f0a2f1 1661 return my_attrs(o, Nullop);
09bef843
SB		 1662}
1663
1664OP *
864dbfa3 1665Perl_sawparens(pTHX_ OP *o)
79072805
LW		 1666{
1667 if (o)
1668 o->op_flags |= OPf_PARENS;
1669 return o;
1670}
1671
1672OP *
864dbfa3 1673Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
79072805 1674{
11343788 1675 OP *o;
79072805 1676
e476b1b5 1677 if (ckWARN(WARN_MISC) &&
599cee73
PM		 1678 (left->op_type == OP_RV2AV ||
1679 left->op_type == OP_RV2HV ||
1680 left->op_type == OP_PADAV ||
1681 left->op_type == OP_PADHV)) {
22c35a8c 1682 char *desc = PL_op_desc[(right->op_type == OP_SUBST ||
599cee73
PM		 1683 right->op_type == OP_TRANS)
1684 ? right->op_type : OP_MATCH];
dff6d3cd
GS		 1685 const char *sample = ((left->op_type == OP_RV2AV ||
1686 left->op_type == OP_PADAV)
1687 ? "@array" : "%hash");
9014280d 1688 Perl_warner(aTHX_ packWARN(WARN_MISC),
1c846c1f 1689 "Applying %s to %s will act on scalar(%s)",
599cee73 1690 desc, sample, sample);
2ae324a7 1691 }
1692
5cc9e5c9
RH		 1693 if (right->op_type == OP_CONST &&
1694 cSVOPx(right)->op_private & OPpCONST_BARE &&
1695 cSVOPx(right)->op_private & OPpCONST_STRICT)
1696 {
1697 no_bareword_allowed(right);
1698 }
1699
de4bf5b3
MG		 1700 if (!(right->op_flags & OPf_STACKED) &&
1701 (right->op_type == OP_MATCH ||
79072805 1702 right->op_type == OP_SUBST ||
de4bf5b3 1703 right->op_type == OP_TRANS)) {
79072805 1704 right->op_flags |= OPf_STACKED;
18808301
JH		 1705 if (right->op_type != OP_MATCH &&
1706 ! (right->op_type == OP_TRANS &&
1707 right->op_private & OPpTRANS_IDENTICAL))
463ee0b2 1708 left = mod(left, right->op_type);
79072805 1709 if (right->op_type == OP_TRANS)
11343788 1710 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1711 else
11343788 1712 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1713 if (type == OP_NOT)
11343788
MB		 1714 return newUNOP(OP_NOT, 0, scalar(o));
1715 return o;
79072805
LW		 1716 }
1717 else
1718 return bind_match(type, left,
1719 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1720}
1721
1722OP *
864dbfa3 1723Perl_invert(pTHX_ OP *o)
79072805 1724{
11343788
MB		 1725 if (!o)
1726 return o;
79072805 1727 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1728 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1729}
1730
1731OP *
864dbfa3 1732Perl_scope(pTHX_ OP *o)
79072805
LW		 1733{
1734 if (o) {
3280af22 1735 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1736 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1737 o->op_type = OP_LEAVE;
22c35a8c 1738 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2 1739 }
fdb22418
HS		 1740 else if (o->op_type == OP_LINESEQ) {
1741 OP *kid;
1742 o->op_type = OP_SCOPE;
1743 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
1744 kid = ((LISTOP*)o)->op_first;
1745 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE)
1746 op_null(kid);
463ee0b2 1747 }
fdb22418
HS		 1748 else
1749 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
79072805
LW		 1750 }
1751 return o;
1752}
1753
b3ac6de7 1754void
864dbfa3 1755Perl_save_hints(pTHX)
b3ac6de7 1756{
3280af22
NIS		 1757 SAVEI32(PL_hints);
1758 SAVESPTR(GvHV(PL_hintgv));
1759 GvHV(PL_hintgv) = newHVhv(GvHV(PL_hintgv));
1760 SAVEFREESV(GvHV(PL_hintgv));
b3ac6de7
IZ		 1761}
1762
a0d0e21e 1763int
864dbfa3 1764Perl_block_start(pTHX_ int full)
79072805 1765{
3280af22 1766 int retval = PL_savestack_ix;
39aa8287
RGS		 1767 /* If there were syntax errors, don't try to start a block */
1768 if (PL_yynerrs) return retval;
b3ac6de7 1769
dd2155a4 1770 pad_block_start(full);
b3ac6de7 1771 SAVEHINTS();
3280af22 1772 PL_hints &= ~HINT_BLOCK_SCOPE;
1c846c1f 1773 SAVESPTR(PL_compiling.cop_warnings);
0453d815 1774 if (! specialWARN(PL_compiling.cop_warnings)) {
599cee73
PM		 1775 PL_compiling.cop_warnings = newSVsv(PL_compiling.cop_warnings) ;
1776 SAVEFREESV(PL_compiling.cop_warnings) ;
1777 }
ac27b0f5
NIS		 1778 SAVESPTR(PL_compiling.cop_io);
1779 if (! specialCopIO(PL_compiling.cop_io)) {
1780 PL_compiling.cop_io = newSVsv(PL_compiling.cop_io) ;
1781 SAVEFREESV(PL_compiling.cop_io) ;
1782 }
a0d0e21e
LW		 1783 return retval;
1784}
1785
1786OP*
864dbfa3 1787Perl_block_end(pTHX_ I32 floor, OP *seq)
a0d0e21e 1788{
3280af22 1789 int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
e9f19e3c 1790 OP* retval = scalarseq(seq);
39aa8287
RGS		 1791 /* If there were syntax errors, don't try to close a block */
1792 if (PL_yynerrs) return retval;
e9818f4e 1793 LEAVE_SCOPE(floor);
eb160463 1794 PL_compiling.op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
a0d0e21e 1795 if (needblockscope)
3280af22 1796 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
dd2155a4 1797 pad_leavemy();
a0d0e21e
LW		 1798 return retval;
1799}
1800
76e3520e 1801STATIC OP *
cea2e8a9 1802S_newDEFSVOP(pTHX)
54b9620d 1803{
3280af22 1804 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
54b9620d
MB		 1805}
1806
a0d0e21e 1807void
864dbfa3 1808Perl_newPROG(pTHX_ OP *o)
a0d0e21e 1809{
3280af22 1810 if (PL_in_eval) {
b295d113
TH		 1811 if (PL_eval_root)
1812 return;
faef0170
HS		 1813 PL_eval_root = newUNOP(OP_LEAVEEVAL,
1814 ((PL_in_eval & EVAL_KEEPERR)
1815 ? OPf_SPECIAL : 0), o);
3280af22 1816 PL_eval_start = linklist(PL_eval_root);
7934575e
GS		 1817 PL_eval_root->op_private |= OPpREFCOUNTED;
1818 OpREFCNT_set(PL_eval_root, 1);
3280af22 1819 PL_eval_root->op_next = 0;
a2efc822 1820 CALL_PEEP(PL_eval_start);
a0d0e21e
LW		 1821 }
1822 else {
6be89cf9
AE		 1823 if (o->op_type == OP_STUB) {
1824 PL_comppad_name = 0;
1825 PL_compcv = 0;
2a4f803a 1826 FreeOp(o);
a0d0e21e 1827 return;
6be89cf9 1828 }
3280af22
NIS		 1829 PL_main_root = scope(sawparens(scalarvoid(o)));
1830 PL_curcop = &PL_compiling;
1831 PL_main_start = LINKLIST(PL_main_root);
7934575e
GS		 1832 PL_main_root->op_private |= OPpREFCOUNTED;
1833 OpREFCNT_set(PL_main_root, 1);
3280af22 1834 PL_main_root->op_next = 0;
a2efc822 1835 CALL_PEEP(PL_main_start);
3280af22 1836 PL_compcv = 0;
3841441e 1837
4fdae800 1838 /* Register with debugger */
84902520 1839 if (PERLDB_INTER) {
864dbfa3 1840 CV *cv = get_cv("DB::postponed", FALSE);
3841441e
CS		 1841 if (cv) {
1842 dSP;
924508f0 1843 PUSHMARK(SP);
cc49e20b 1844 XPUSHs((SV*)CopFILEGV(&PL_compiling));
3841441e 1845 PUTBACK;
864dbfa3 1846 call_sv((SV*)cv, G_DISCARD);
3841441e
CS		 1847 }
1848 }
79072805 1849 }
79072805
LW		 1850}
1851
1852OP *
864dbfa3 1853Perl_localize(pTHX_ OP *o, I32 lex)
79072805
LW		 1854{
1855 if (o->op_flags & OPf_PARENS)
d2be0de5
YST		 1856/* [perl #17376]: this appears to be premature, and results in code such as
1857 C< our(%x); > executing in list mode rather than void mode */
1858#if 0
79072805 1859 list(o);
d2be0de5
YST		 1860#else
1861 ;
1862#endif
8990e307 1863 else {
64420d0d
JH		 1864 if (ckWARN(WARN_PARENTHESIS)
1865 && PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ',')
1866 {
1867 char *s = PL_bufptr;
8473848f 1868 int sigil = 0;
64420d0d 1869
8473848f
RGS		 1870 /* some heuristics to detect a potential error */
1871 while (*s && (strchr(", \t\n", *s)
1872 || (strchr("@$%*", *s) && ++sigil) ))
64420d0d 1873 s++;
8473848f
RGS		 1874 if (sigil) {
1875 while (*s && (isALNUM(*s) || UTF8_IS_CONTINUED(*s)
1876 || strchr("@$%*, \t\n", *s)))
1877 s++;
1878
1879 if (*s == ';' || *s == '=')
1880 Perl_warner(aTHX_ packWARN(WARN_PARENTHESIS),
1881 "Parentheses missing around \"%s\" list",
1882 lex ? (PL_in_my == KEY_our ? "our" : "my")
1883 : "local");
1884 }
8990e307
LW		 1885 }
1886 }
93a17b20 1887 if (lex)
eb64745e 1888 o = my(o);
93a17b20 1889 else
eb64745e
GS		 1890 o = mod(o, OP_NULL); /* a bit kludgey */
1891 PL_in_my = FALSE;
1892 PL_in_my_stash = Nullhv;
1893 return o;
79072805
LW		 1894}
1895
1896OP *
864dbfa3 1897Perl_jmaybe(pTHX_ OP *o)
79072805
LW		 1898{
1899 if (o->op_type == OP_LIST) {
554b3eca 1900 OP *o2;
554b3eca 1901 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
554b3eca 1902 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 1903 }
1904 return o;
1905}
1906
1907OP *
864dbfa3 1908Perl_fold_constants(pTHX_ register OP *o)
79072805
LW		 1909{
1910 register OP *curop;
1911 I32 type = o->op_type;
748a9306 1912 SV *sv;
79072805 1913
22c35a8c 1914 if (PL_opargs[type] & OA_RETSCALAR)
79072805 1915 scalar(o);
b162f9ea 1916 if (PL_opargs[type] & OA_TARGET && !o->op_targ)
ed6116ce 1917 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1918
eac055e9
GS		 1919 /* integerize op, unless it happens to be C<-foo>.
1920 * XXX should pp_i_negate() do magic string negation instead? */
1921 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)
1922 && !(type == OP_NEGATE && cUNOPo->op_first->op_type == OP_CONST
1923 && (cUNOPo->op_first->op_private & OPpCONST_BARE)))
1924 {
22c35a8c 1925 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
eac055e9 1926 }
85e6fe83 1927
22c35a8c 1928 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 1929 goto nope;
1930
de939608 1931 switch (type) {
7a52d87a
GS		 1932 case OP_NEGATE:
1933 /* XXX might want a ck_negate() for this */
1934 cUNOPo->op_first->op_private &= ~OPpCONST_STRICT;
1935 break;
de939608
CS		 1936 case OP_SPRINTF:
1937 case OP_UCFIRST:
1938 case OP_LCFIRST:
1939 case OP_UC:
1940 case OP_LC:
69dcf70c
MB		 1941 case OP_SLT:
1942 case OP_SGT:
1943 case OP_SLE:
1944 case OP_SGE:
1945 case OP_SCMP:
2de3dbcc
JH		 1946 /* XXX what about the numeric ops? */
1947 if (PL_hints & HINT_LOCALE)
de939608
CS		 1948 goto nope;
1949 }
1950
3280af22 1951 if (PL_error_count)
a0d0e21e
LW		 1952 goto nope; /* Don't try to run w/ errors */
1953
79072805 1954 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
11fa937b
GS		 1955 if ((curop->op_type != OP_CONST ||
1956 (curop->op_private & OPpCONST_BARE)) &&
7a52d87a
GS		 1957 curop->op_type != OP_LIST &&
1958 curop->op_type != OP_SCALAR &&
1959 curop->op_type != OP_NULL &&
1960 curop->op_type != OP_PUSHMARK)
1961 {
79072805
LW		 1962 goto nope;
1963 }
1964 }
1965
1966 curop = LINKLIST(o);
1967 o->op_next = 0;
533c011a 1968 PL_op = curop;
cea2e8a9 1969 CALLRUNOPS(aTHX);
3280af22 1970 sv = *(PL_stack_sp--);
748a9306 1971 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
dd2155a4 1972 pad_swipe(o->op_targ, FALSE);
748a9306
LW		 1973 else if (SvTEMP(sv)) { /* grab mortal temp? */
1974 (void)SvREFCNT_inc(sv);
1975 SvTEMP_off(sv);
85e6fe83 1976 }
79072805
LW		 1977 op_free(o);
1978 if (type == OP_RV2GV)
b1cb66bf 1979 return newGVOP(OP_GV, 0, (GV*)sv);
52a96ae6 1980 return newSVOP(OP_CONST, 0, sv);
aeea060c 1981
79072805 1982 nope:
79072805
LW		 1983 return o;
1984}
1985
1986OP *
864dbfa3 1987Perl_gen_constant_list(pTHX_ register OP *o)
79072805
LW		 1988{
1989 register OP *curop;
3280af22 1990 I32 oldtmps_floor = PL_tmps_floor;
79072805 1991
a0d0e21e 1992 list(o);
3280af22 1993 if (PL_error_count)
a0d0e21e
LW		 1994 return o; /* Don't attempt to run with errors */
1995
533c011a 1996 PL_op = curop = LINKLIST(o);
a0d0e21e 1997 o->op_next = 0;
a2efc822 1998 CALL_PEEP(curop);
cea2e8a9
GS		 1999 pp_pushmark();
2000 CALLRUNOPS(aTHX);
533c011a 2001 PL_op = curop;
cea2e8a9 2002 pp_anonlist();
3280af22 2003 PL_tmps_floor = oldtmps_floor;
79072805
LW		 2004
2005 o->op_type = OP_RV2AV;
22c35a8c 2006 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
fb53bbb2
SG		 2007 o->op_flags &= ~OPf_REF; /* treat \(1..2) like an ordinary list */
2008 o->op_flags |= OPf_PARENS; /* and flatten \(1..2,3) */
c13f253a 2009 o->op_seq = 0; /* needs to be revisited in peep() */
79072805 2010 curop = ((UNOP*)o)->op_first;
3280af22 2011 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*PL_stack_sp--));
79072805 2012 op_free(curop);
79072805
LW		 2013 linklist(o);
2014 return list(o);
2015}
2016
2017OP *
864dbfa3 2018Perl_convert(pTHX_ I32 type, I32 flags, OP *o)
79072805 2019{
11343788
MB		 2020 if (!o || o->op_type != OP_LIST)
2021 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 2022 else
5dc0d613 2023 o->op_flags &= ~OPf_WANT;
79072805 2024
22c35a8c 2025 if (!(PL_opargs[type] & OA_MARK))
93c66552 2026 op_null(cLISTOPo->op_first);
8990e307 2027
eb160463 2028 o->op_type = (OPCODE)type;
22c35a8c 2029 o->op_ppaddr = PL_ppaddr[type];
11343788 2030 o->op_flags |= flags;
79072805 2031
11343788
MB		 2032 o = CHECKOP(type, o);
2033 if (o->op_type != type)
2034 return o;
79072805 2035
11343788 2036 return fold_constants(o);
79072805
LW		 2037}
2038
2039/* List constructors */
2040
2041OP *
864dbfa3 2042Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2043{
2044 if (!first)
2045 return last;
8990e307
LW		 2046
2047 if (!last)
79072805 2048 return first;
8990e307 2049
155aba94
GS		 2050 if (first->op_type != type
2051 || (type == OP_LIST && (first->op_flags & OPf_PARENS)))
2052 {
2053 return newLISTOP(type, 0, first, last);
2054 }
79072805 2055
a0d0e21e
LW		 2056 if (first->op_flags & OPf_KIDS)
2057 ((LISTOP*)first)->op_last->op_sibling = last;
2058 else {
2059 first->op_flags |= OPf_KIDS;
2060 ((LISTOP*)first)->op_first = last;
2061 }
2062 ((LISTOP*)first)->op_last = last;
a0d0e21e 2063 return first;
79072805
LW		 2064}
2065
2066OP *
864dbfa3 2067Perl_append_list(pTHX_ I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2068{
2069 if (!first)
2070 return (OP*)last;
8990e307
LW		 2071
2072 if (!last)
79072805 2073 return (OP*)first;
8990e307
LW		 2074
2075 if (first->op_type != type)
79072805 2076 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 2077
2078 if (last->op_type != type)
79072805
LW		 2079 return append_elem(type, (OP*)first, (OP*)last);
2080
2081 first->op_last->op_sibling = last->op_first;
2082 first->op_last = last->op_last;
117dada2 2083 first->op_flags |= (last->op_flags & OPf_KIDS);
1c846c1f 2084
238a4c30
NIS		 2085 FreeOp(last);
2086
79072805
LW		 2087 return (OP*)first;
2088}
2089
2090OP *
864dbfa3 2091Perl_prepend_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2092{
2093 if (!first)
2094 return last;
8990e307
LW		 2095
2096 if (!last)
79072805 2097 return first;
8990e307
LW		 2098
2099 if (last->op_type == type) {
2100 if (type == OP_LIST) { /* already a PUSHMARK there */
2101 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2102 ((LISTOP*)last)->op_first->op_sibling = first;
36a5d4ba
DC		 2103 if (!(first->op_flags & OPf_PARENS))
2104 last->op_flags &= ~OPf_PARENS;
8990e307
LW		 2105 }
2106 else {
2107 if (!(last->op_flags & OPf_KIDS)) {
2108 ((LISTOP*)last)->op_last = first;
2109 last->op_flags |= OPf_KIDS;
2110 }
2111 first->op_sibling = ((LISTOP*)last)->op_first;
2112 ((LISTOP*)last)->op_first = first;
79072805 2113 }
117dada2 2114 last->op_flags |= OPf_KIDS;
79072805
LW		 2115 return last;
2116 }
2117
2118 return newLISTOP(type, 0, first, last);
2119}
2120
2121/* Constructors */
2122
2123OP *
864dbfa3 2124Perl_newNULLLIST(pTHX)
79072805 2125{
8990e307
LW		 2126 return newOP(OP_STUB, 0);
2127}
2128
2129OP *
864dbfa3 2130Perl_force_list(pTHX_ OP *o)
8990e307 2131{
11343788
MB		 2132 if (!o || o->op_type != OP_LIST)
2133 o = newLISTOP(OP_LIST, 0, o, Nullop);
93c66552 2134 op_null(o);
11343788 2135 return o;
79072805
LW		 2136}
2137
2138OP *
864dbfa3 2139Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2140{
2141 LISTOP *listop;
2142
b7dc083c 2143 NewOp(1101, listop, 1, LISTOP);
79072805 2144
eb160463 2145 listop->op_type = (OPCODE)type;
22c35a8c 2146 listop->op_ppaddr = PL_ppaddr[type];
117dada2
SM		 2147 if (first || last)
2148 flags |= OPf_KIDS;
eb160463 2149 listop->op_flags = (U8)flags;
79072805
LW		 2150
2151 if (!last && first)
2152 last = first;
2153 else if (!first && last)
2154 first = last;
8990e307
LW		 2155 else if (first)
2156 first->op_sibling = last;
79072805
LW		 2157 listop->op_first = first;
2158 listop->op_last = last;
8990e307
LW		 2159 if (type == OP_LIST) {
2160 OP* pushop;
2161 pushop = newOP(OP_PUSHMARK, 0);
2162 pushop->op_sibling = first;
2163 listop->op_first = pushop;
2164 listop->op_flags |= OPf_KIDS;
2165 if (!last)
2166 listop->op_last = pushop;
2167 }
79072805 2168
463d09e6 2169 return CHECKOP(type, listop);
79072805
LW		 2170}
2171
2172OP *
864dbfa3 2173Perl_newOP(pTHX_ I32 type, I32 flags)
79072805 2174{
11343788 2175 OP *o;
b7dc083c 2176 NewOp(1101, o, 1, OP);
eb160463 2177 o->op_type = (OPCODE)type;
22c35a8c 2178 o->op_ppaddr = PL_ppaddr[type];
eb160463 2179 o->op_flags = (U8)flags;
79072805 2180
11343788 2181 o->op_next = o;
eb160463 2182 o->op_private = (U8)(0 | (flags >> 8));
22c35a8c 2183 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2184 scalar(o);
22c35a8c 2185 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2186 o->op_targ = pad_alloc(type, SVs_PADTMP);
2187 return CHECKOP(type, o);
79072805
LW		 2188}
2189
2190OP *
864dbfa3 2191Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first)
79072805
LW		 2192{
2193 UNOP *unop;
2194
93a17b20 2195 if (!first)
aeea060c 2196 first = newOP(OP_STUB, 0);
22c35a8c 2197 if (PL_opargs[type] & OA_MARK)
8990e307 2198 first = force_list(first);
93a17b20 2199
b7dc083c 2200 NewOp(1101, unop, 1, UNOP);
eb160463 2201 unop->op_type = (OPCODE)type;
22c35a8c 2202 unop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2203 unop->op_first = first;
2204 unop->op_flags = flags | OPf_KIDS;
eb160463 2205 unop->op_private = (U8)(1 | (flags >> 8));
e50aee73 2206 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2207 if (unop->op_next)
2208 return (OP*)unop;
2209
a0d0e21e 2210 return fold_constants((OP *) unop);
79072805
LW		 2211}
2212
2213OP *
864dbfa3 2214Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2215{
2216 BINOP *binop;
b7dc083c 2217 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2218
2219 if (!first)
2220 first = newOP(OP_NULL, 0);
2221
eb160463 2222 binop->op_type = (OPCODE)type;
22c35a8c 2223 binop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2224 binop->op_first = first;
2225 binop->op_flags = flags | OPf_KIDS;
2226 if (!last) {
2227 last = first;
eb160463 2228 binop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 2229 }
2230 else {
eb160463 2231 binop->op_private = (U8)(2 | (flags >> 8));
79072805
LW		 2232 first->op_sibling = last;
2233 }
2234
e50aee73 2235 binop = (BINOP*)CHECKOP(type, binop);
eb160463 2236 if (binop->op_next || binop->op_type != (OPCODE)type)
79072805
LW		 2237 return (OP*)binop;
2238
7284ab6f 2239 binop->op_last = binop->op_first->op_sibling;
79072805 2240
a0d0e21e 2241 return fold_constants((OP *)binop);
79072805
LW		 2242}
2243
a0ed51b3 2244static int
2b9d42f0
NIS		 2245uvcompare(const void *a, const void *b)
2246{
2247 if (*((UV *)a) < (*(UV *)b))
2248 return -1;
2249 if (*((UV *)a) > (*(UV *)b))
2250 return 1;
2251 if (*((UV *)a+1) < (*(UV *)b+1))
2252 return -1;
2253 if (*((UV *)a+1) > (*(UV *)b+1))
2254 return 1;
a0ed51b3
LW		 2255 return 0;
2256}
2257
79072805 2258OP *
864dbfa3 2259Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2260{
79072805
LW		 2261 SV *tstr = ((SVOP*)expr)->op_sv;
2262 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2263 STRLEN tlen;
2264 STRLEN rlen;
9b877dbb
IH		 2265 U8 *t = (U8*)SvPV(tstr, tlen);
2266 U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 2267 register I32 i;
2268 register I32 j;
a0ed51b3 2269 I32 del;
79072805 2270 I32 complement;
5d06d08e 2271 I32 squash;
9b877dbb 2272 I32 grows = 0;
79072805
LW		 2273 register short *tbl;
2274
800b4dc4 2275 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2276 complement = o->op_private & OPpTRANS_COMPLEMENT;
a0ed51b3 2277 del = o->op_private & OPpTRANS_DELETE;
5d06d08e 2278 squash = o->op_private & OPpTRANS_SQUASH;
1c846c1f 2279
036b4402
GS		 2280 if (SvUTF8(tstr))
2281 o->op_private |= OPpTRANS_FROM_UTF;
1c846c1f
NIS		 2282
2283 if (SvUTF8(rstr))
036b4402 2284 o->op_private |= OPpTRANS_TO_UTF;
79072805 2285
a0ed51b3 2286 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
79cb57f6 2287 SV* listsv = newSVpvn("# comment\n",10);
a0ed51b3
LW		 2288 SV* transv = 0;
2289 U8* tend = t + tlen;
2290 U8* rend = r + rlen;
ba210ebe 2291 STRLEN ulen;
84c133a0
RB		 2292 UV tfirst = 1;
2293 UV tlast = 0;
2294 IV tdiff;
2295 UV rfirst = 1;
2296 UV rlast = 0;
2297 IV rdiff;
2298 IV diff;
a0ed51b3
LW		 2299 I32 none = 0;
2300 U32 max = 0;
2301 I32 bits;
a0ed51b3 2302 I32 havefinal = 0;
9c5ffd7c 2303 U32 final = 0;
a0ed51b3
LW		 2304 I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2305 I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
bf4a1e57
JH		 2306 U8* tsave = NULL;
2307 U8* rsave = NULL;
2308
2309 if (!from_utf) {
2310 STRLEN len = tlen;
2311 tsave = t = bytes_to_utf8(t, &len);
2312 tend = t + len;
2313 }
2314 if (!to_utf && rlen) {
2315 STRLEN len = rlen;
2316 rsave = r = bytes_to_utf8(r, &len);
2317 rend = r + len;
2318 }
a0ed51b3 2319
2b9d42f0
NIS		 2320/* There are several snags with this code on EBCDIC:
2321 1. 0xFF is a legal UTF-EBCDIC byte (there are no illegal bytes).
2322 2. scan_const() in toke.c has encoded chars in native encoding which makes
2323 ranges at least in EBCDIC 0..255 range the bottom odd.
2324*/
2325
a0ed51b3 2326 if (complement) {
ad391ad9 2327 U8 tmpbuf[UTF8_MAXLEN+1];
2b9d42f0 2328 UV *cp;
a0ed51b3 2329 UV nextmin = 0;
2b9d42f0 2330 New(1109, cp, 2*tlen, UV);
a0ed51b3 2331 i = 0;
79cb57f6 2332 transv = newSVpvn("",0);
a0ed51b3 2333 while (t < tend) {
2b9d42f0
NIS		 2334 cp[2*i] = utf8n_to_uvuni(t, tend-t, &ulen, 0);
2335 t += ulen;
2336 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) {
a0ed51b3 2337 t++;
2b9d42f0
NIS		 2338 cp[2*i+1] = utf8n_to_uvuni(t, tend-t, &ulen, 0);
2339 t += ulen;
a0ed51b3 2340 }
2b9d42f0
NIS		 2341 else {
2342 cp[2*i+1] = cp[2*i];
2343 }
2344 i++;
a0ed51b3 2345 }
2b9d42f0 2346 qsort(cp, i, 2*sizeof(UV), uvcompare);
a0ed51b3 2347 for (j = 0; j < i; j++) {
2b9d42f0 2348 UV val = cp[2*j];
a0ed51b3
LW		 2349 diff = val - nextmin;
2350 if (diff > 0) {
9041c2e3 2351 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2352 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3 2353 if (diff > 1) {
2b9d42f0 2354 U8 range_mark = UTF_TO_NATIVE(0xff);
9041c2e3 2355 t = uvuni_to_utf8(tmpbuf, val - 1);
2b9d42f0 2356 sv_catpvn(transv, (char *)&range_mark, 1);
dfe13c55 2357 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2358 }
2359 }
2b9d42f0 2360 val = cp[2*j+1];
a0ed51b3
LW		 2361 if (val >= nextmin)
2362 nextmin = val + 1;
2363 }
9041c2e3 2364 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2365 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2b9d42f0
NIS		 2366 {
2367 U8 range_mark = UTF_TO_NATIVE(0xff);
2368 sv_catpvn(transv, (char *)&range_mark, 1);
2369 }
b851fbc1
JH		 2370 t = uvuni_to_utf8_flags(tmpbuf, 0x7fffffff,
2371 UNICODE_ALLOW_SUPER);
dfe13c55
GS		 2372 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2373 t = (U8*)SvPVX(transv);
a0ed51b3
LW		 2374 tlen = SvCUR(transv);
2375 tend = t + tlen;
455d824a 2376 Safefree(cp);
a0ed51b3
LW		 2377 }
2378 else if (!rlen && !del) {
2379 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2380 }
2381 if (!squash) {
05d340b8 2382 if ((!rlen && !del) || t == r ||
12ae5dfc 2383 (tlen == rlen && memEQ((char *)t, (char *)r, tlen)))
01ec43d0 2384 {
4757a243 2385 o->op_private |= OPpTRANS_IDENTICAL;
01ec43d0 2386 }
a0ed51b3
LW		 2387 }
2388
2389 while (t < tend || tfirst <= tlast) {
2390 /* see if we need more "t" chars */
2391 if (tfirst > tlast) {
9041c2e3 2392 tfirst = (I32)utf8n_to_uvuni(t, tend - t, &ulen, 0);
a0ed51b3 2393 t += ulen;
2b9d42f0 2394 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2395 t++;
9041c2e3 2396 tlast = (I32)utf8n_to_uvuni(t, tend - t, &ulen, 0);
a0ed51b3
LW		 2397 t += ulen;
2398 }
2399 else
2400 tlast = tfirst;
2401 }
2402
2403 /* now see if we need more "r" chars */
2404 if (rfirst > rlast) {
2405 if (r < rend) {
9041c2e3 2406 rfirst = (I32)utf8n_to_uvuni(r, rend - r, &ulen, 0);
a0ed51b3 2407 r += ulen;
2b9d42f0 2408 if (r < rend && NATIVE_TO_UTF(*r) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2409 r++;
9041c2e3 2410 rlast = (I32)utf8n_to_uvuni(r, rend - r, &ulen, 0);
a0ed51b3
LW		 2411 r += ulen;
2412 }
2413 else
2414 rlast = rfirst;
2415 }
2416 else {
2417 if (!havefinal++)
2418 final = rlast;
2419 rfirst = rlast = 0xffffffff;
2420 }
2421 }
2422
2423 /* now see which range will peter our first, if either. */
2424 tdiff = tlast - tfirst;
2425 rdiff = rlast - rfirst;
2426
2427 if (tdiff <= rdiff)
2428 diff = tdiff;
2429 else
2430 diff = rdiff;
2431
2432 if (rfirst == 0xffffffff) {
2433 diff = tdiff; /* oops, pretend rdiff is infinite */
2434 if (diff > 0)
894356b3
GS		 2435 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\tXXXX\n",
2436 (long)tfirst, (long)tlast);
a0ed51b3 2437 else
894356b3 2438 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\tXXXX\n", (long)tfirst);
a0ed51b3
LW		 2439 }
2440 else {
2441 if (diff > 0)
894356b3
GS		 2442 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\t%04lx\n",
2443 (long)tfirst, (long)(tfirst + diff),
2444 (long)rfirst);
a0ed51b3 2445 else
894356b3
GS		 2446 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\t%04lx\n",
2447 (long)tfirst, (long)rfirst);
a0ed51b3
LW		 2448
2449 if (rfirst + diff > max)
2450 max = rfirst + diff;
9b877dbb 2451 if (!grows)
45005bfb
JH		 2452 grows = (tfirst < rfirst &&
2453 UNISKIP(tfirst) < UNISKIP(rfirst + diff));
2454 rfirst += diff + 1;
a0ed51b3
LW		 2455 }
2456 tfirst += diff + 1;
2457 }
2458
2459 none = ++max;
2460 if (del)
2461 del = ++max;
2462
2463 if (max > 0xffff)
2464 bits = 32;
2465 else if (max > 0xff)
2466 bits = 16;
2467 else
2468 bits = 8;
2469
455d824a 2470 Safefree(cPVOPo->op_pv);
a0ed51b3
LW		 2471 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2472 SvREFCNT_dec(listsv);
2473 if (transv)
2474 SvREFCNT_dec(transv);
2475
45005bfb 2476 if (!del && havefinal && rlen)
b448e4fe
JH		 2477 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5,
2478 newSVuv((UV)final), 0);
a0ed51b3 2479
9b877dbb 2480 if (grows)
a0ed51b3
LW		 2481 o->op_private |= OPpTRANS_GROWS;
2482
9b877dbb
IH		 2483 if (tsave)
2484 Safefree(tsave);
2485 if (rsave)
2486 Safefree(rsave);
2487
a0ed51b3
LW		 2488 op_free(expr);
2489 op_free(repl);
2490 return o;
2491 }
2492
2493 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 2494 if (complement) {
2495 Zero(tbl, 256, short);
eb160463 2496 for (i = 0; i < (I32)tlen; i++)
ec49126f 2497 tbl[t[i]] = -1;
79072805
LW		 2498 for (i = 0, j = 0; i < 256; i++) {
2499 if (!tbl[i]) {
eb160463 2500 if (j >= (I32)rlen) {
a0ed51b3 2501 if (del)
79072805
LW		 2502 tbl[i] = -2;
2503 else if (rlen)
ec49126f 2504 tbl[i] = r[j-1];
79072805 2505 else
eb160463 2506 tbl[i] = (short)i;
79072805 2507 }
9b877dbb
IH		 2508 else {
2509 if (i < 128 && r[j] >= 128)
2510 grows = 1;
ec49126f 2511 tbl[i] = r[j++];
9b877dbb 2512 }
79072805
LW		 2513 }
2514 }
05d340b8
JH		 2515 if (!del) {
2516 if (!rlen) {
2517 j = rlen;
2518 if (!squash)
2519 o->op_private |= OPpTRANS_IDENTICAL;
2520 }
eb160463 2521 else if (j >= (I32)rlen)
05d340b8
JH		 2522 j = rlen - 1;
2523 else
2524 cPVOPo->op_pv = (char*)Renew(tbl, 0x101+rlen-j, short);
8973db79 2525 tbl[0x100] = rlen - j;
eb160463 2526 for (i=0; i < (I32)rlen - j; i++)
8973db79
JH		 2527 tbl[0x101+i] = r[j+i];
2528 }
79072805
LW		 2529 }
2530 else {
a0ed51b3 2531 if (!rlen && !del) {
79072805 2532 r = t; rlen = tlen;
5d06d08e 2533 if (!squash)
4757a243 2534 o->op_private |= OPpTRANS_IDENTICAL;
79072805 2535 }
94bfe852
RGS		 2536 else if (!squash && rlen == tlen && memEQ((char*)t, (char*)r, tlen)) {
2537 o->op_private |= OPpTRANS_IDENTICAL;
2538 }
79072805
LW		 2539 for (i = 0; i < 256; i++)
2540 tbl[i] = -1;
eb160463
GS		 2541 for (i = 0, j = 0; i < (I32)tlen; i++,j++) {
2542 if (j >= (I32)rlen) {
a0ed51b3 2543 if (del) {
ec49126f 2544 if (tbl[t[i]] == -1)
2545 tbl[t[i]] = -2;
79072805
LW		 2546 continue;
2547 }
2548 --j;
2549 }
9b877dbb
IH		 2550 if (tbl[t[i]] == -1) {
2551 if (t[i] < 128 && r[j] >= 128)
2552 grows = 1;
ec49126f 2553 tbl[t[i]] = r[j];
9b877dbb 2554 }
79072805
LW		 2555 }
2556 }
9b877dbb
IH		 2557 if (grows)
2558 o->op_private |= OPpTRANS_GROWS;
79072805
LW		 2559 op_free(expr);
2560 op_free(repl);
2561
11343788 2562 return o;
79072805
LW		 2563}
2564
2565OP *
864dbfa3 2566Perl_newPMOP(pTHX_ I32 type, I32 flags)
79072805
LW		 2567{
2568 PMOP *pmop;
2569
b7dc083c 2570 NewOp(1101, pmop, 1, PMOP);
eb160463 2571 pmop->op_type = (OPCODE)type;
22c35a8c 2572 pmop->op_ppaddr = PL_ppaddr[type];
eb160463
GS		 2573 pmop->op_flags = (U8)flags;
2574 pmop->op_private = (U8)(0 | (flags >> 8));
79072805 2575
3280af22 2576 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 2577 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 2578 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 2579 pmop->op_pmpermflags |= PMf_LOCALE;
2580 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2581
debc9467 2582#ifdef USE_ITHREADS
13137afc
AB		 2583 {
2584 SV* repointer;
2585 if(av_len((AV*) PL_regex_pad[0]) > -1) {
2586 repointer = av_pop((AV*)PL_regex_pad[0]);
2587 pmop->op_pmoffset = SvIV(repointer);
1cc8b4c5 2588 SvREPADTMP_off(repointer);
13137afc 2589 sv_setiv(repointer,0);
1eb1540c 2590 } else {
13137afc
AB		 2591 repointer = newSViv(0);
2592 av_push(PL_regex_padav,SvREFCNT_inc(repointer));
2593 pmop->op_pmoffset = av_len(PL_regex_padav);
2594 PL_regex_pad = AvARRAY(PL_regex_padav);
1fcf4c12 2595 }
13137afc 2596 }
debc9467 2597#endif
1eb1540c 2598
1fcf4c12 2599 /* link into pm list */
3280af22
NIS		 2600 if (type != OP_TRANS && PL_curstash) {
2601 pmop->op_pmnext = HvPMROOT(PL_curstash);
2602 HvPMROOT(PL_curstash) = pmop;
cb55de95 2603 PmopSTASH_set(pmop,PL_curstash);
79072805
LW		 2604 }
2605
463d09e6 2606 return CHECKOP(type, pmop);
79072805
LW		 2607}
2608
2609OP *
864dbfa3 2610Perl_pmruntime(pTHX_ OP *o, OP *expr, OP *repl)
79072805
LW		 2611{
2612 PMOP *pm;
2613 LOGOP *rcop;
ce862d02 2614 I32 repl_has_vars = 0;
79072805 2615
11343788
MB		 2616 if (o->op_type == OP_TRANS)
2617 return pmtrans(o, expr, repl);
79072805 2618
3280af22 2619 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2620 pm = (PMOP*)o;
79072805
LW		 2621
2622 if (expr->op_type == OP_CONST) {
463ee0b2 2623 STRLEN plen;
79072805 2624 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2625 char *p = SvPV(pat, plen);
11343788 2626 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2627 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2628 p = SvPV(pat, plen);
79072805
LW		 2629 pm->op_pmflags |= PMf_SKIPWHITE;
2630 }
5b71a6a7 2631 if (DO_UTF8(pat))
a5961de5 2632 pm->op_pmdynflags |= PMdf_UTF8;
aaa362c4
RS		 2633 PM_SETRE(pm, CALLREGCOMP(aTHX_ p, p + plen, pm));
2634 if (strEQ("\\s+", PM_GETRE(pm)->precomp))
85e6fe83 2635 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2636 op_free(expr);
2637 }
2638 else {
3280af22 2639 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
1c846c1f 2640 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2641 ? OP_REGCRESET
2642 : OP_REGCMAYBE),0,expr);
463ee0b2 2643
b7dc083c 2644 NewOp(1101, rcop, 1, LOGOP);
79072805 2645 rcop->op_type = OP_REGCOMP;
22c35a8c 2646 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 2647 rcop->op_first = scalar(expr);
1c846c1f 2648 rcop->op_flags |= ((PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2649 ? (OPf_SPECIAL | OPf_KIDS)
2650 : OPf_KIDS);
79072805 2651 rcop->op_private = 1;
11343788 2652 rcop->op_other = o;
b5c19bd7
DM		 2653 /* /$x/ may cause an eval, since $x might be qr/(?{..})/ */
2654 PL_cv_has_eval = 1;
79072805
LW		 2655
2656 /* establish postfix order */
3280af22 2657 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2658 LINKLIST(expr);
2659 rcop->op_next = expr;
2660 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2661 }
2662 else {
2663 rcop->op_next = LINKLIST(expr);
2664 expr->op_next = (OP*)rcop;
2665 }
79072805 2666
11343788 2667 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2668 }
2669
2670 if (repl) {
748a9306 2671 OP *curop;
0244c3a4 2672 if (pm->op_pmflags & PMf_EVAL) {
748a9306 2673 curop = 0;
8bafa735 2674 if (CopLINE(PL_curcop) < (line_t)PL_multi_end)
eb160463 2675 CopLINE_set(PL_curcop, (line_t)PL_multi_end);
0244c3a4 2676 }
748a9306
LW		 2677 else if (repl->op_type == OP_CONST)
2678 curop = repl;
79072805 2679 else {
79072805
LW		 2680 OP *lastop = 0;
2681 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 2682 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 2683 if (curop->op_type == OP_GV) {
638eceb6 2684 GV *gv = cGVOPx_gv(curop);
ce862d02 2685 repl_has_vars = 1;
f702bf4a 2686 if (strchr("&`'123456789+-\016\022", *GvENAME(gv)))
79072805
LW		 2687 break;
2688 }
2689 else if (curop->op_type == OP_RV2CV)
2690 break;
2691 else if (curop->op_type == OP_RV2SV ||
2692 curop->op_type == OP_RV2AV ||
2693 curop->op_type == OP_RV2HV ||
2694 curop->op_type == OP_RV2GV) {
2695 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2696 break;
2697 }
748a9306
LW		 2698 else if (curop->op_type == OP_PADSV ||
2699 curop->op_type == OP_PADAV ||
2700 curop->op_type == OP_PADHV ||
554b3eca 2701 curop->op_type == OP_PADANY) {
ce862d02 2702 repl_has_vars = 1;
748a9306 2703 }
1167e5da
SM		 2704 else if (curop->op_type == OP_PUSHRE)
2705 ; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 2706 else
2707 break;
2708 }
2709 lastop = curop;
2710 }
748a9306 2711 }
ce862d02 2712 if (curop == repl
1c846c1f 2713 && !(repl_has_vars
aaa362c4
RS		 2714 && (!PM_GETRE(pm)
2715 || PM_GETRE(pm)->reganch & ROPT_EVAL_SEEN))) {
748a9306 2716 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2717 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2718 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2719 }
2720 else {
aaa362c4 2721 if (curop == repl && !PM_GETRE(pm)) { /* Has variables. */
ce862d02
IZ		 2722 pm->op_pmflags |= PMf_MAYBE_CONST;
2723 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2724 }
b7dc083c 2725 NewOp(1101, rcop, 1, LOGOP);
748a9306 2726 rcop->op_type = OP_SUBSTCONT;
22c35a8c 2727 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 2728 rcop->op_first = scalar(repl);
2729 rcop->op_flags |= OPf_KIDS;
2730 rcop->op_private = 1;
11343788 2731 rcop->op_other = o;
748a9306
LW		 2732
2733 /* establish postfix order */
2734 rcop->op_next = LINKLIST(repl);
2735 repl->op_next = (OP*)rcop;
2736
2737 pm->op_pmreplroot = scalar((OP*)rcop);
2738 pm->op_pmreplstart = LINKLIST(rcop);
2739 rcop->op_next = 0;
79072805
LW		 2740 }
2741 }
2742
2743 return (OP*)pm;
2744}
2745
2746OP *
864dbfa3 2747Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv)
79072805
LW		 2748{
2749 SVOP *svop;
b7dc083c 2750 NewOp(1101, svop, 1, SVOP);
eb160463 2751 svop->op_type = (OPCODE)type;
22c35a8c 2752 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2753 svop->op_sv = sv;
2754 svop->op_next = (OP*)svop;
eb160463 2755 svop->op_flags = (U8)flags;
22c35a8c 2756 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2757 scalar((OP*)svop);
22c35a8c 2758 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2759 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2760 return CHECKOP(type, svop);
79072805
LW		 2761}
2762
2763OP *
350de78d
GS		 2764Perl_newPADOP(pTHX_ I32 type, I32 flags, SV *sv)
2765{
2766 PADOP *padop;
2767 NewOp(1101, padop, 1, PADOP);
eb160463 2768 padop->op_type = (OPCODE)type;
350de78d
GS		 2769 padop->op_ppaddr = PL_ppaddr[type];
2770 padop->op_padix = pad_alloc(type, SVs_PADTMP);
dd2155a4
DM		 2771 SvREFCNT_dec(PAD_SVl(padop->op_padix));
2772 PAD_SETSV(padop->op_padix, sv);
ce50c033
AMS		 2773 if (sv)
2774 SvPADTMP_on(sv);
350de78d 2775 padop->op_next = (OP*)padop;
eb160463 2776 padop->op_flags = (U8)flags;
350de78d
GS		 2777 if (PL_opargs[type] & OA_RETSCALAR)
2778 scalar((OP*)padop);
2779 if (PL_opargs[type] & OA_TARGET)
2780 padop->op_targ = pad_alloc(type, SVs_PADTMP);
2781 return CHECKOP(type, padop);
2782}
2783
2784OP *
864dbfa3 2785Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
79072805 2786{
350de78d 2787#ifdef USE_ITHREADS
ce50c033
AMS		 2788 if (gv)
2789 GvIN_PAD_on(gv);
350de78d
GS		 2790 return newPADOP(type, flags, SvREFCNT_inc(gv));
2791#else
7934575e 2792 return newSVOP(type, flags, SvREFCNT_inc(gv));
350de78d 2793#endif
79072805
LW		 2794}
2795
2796OP *
864dbfa3 2797Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv)
79072805
LW		 2798{
2799 PVOP *pvop;
b7dc083c 2800 NewOp(1101, pvop, 1, PVOP);
eb160463 2801 pvop->op_type = (OPCODE)type;
22c35a8c 2802 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2803 pvop->op_pv = pv;
2804 pvop->op_next = (OP*)pvop;
eb160463 2805 pvop->op_flags = (U8)flags;
22c35a8c 2806 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2807 scalar((OP*)pvop);
22c35a8c 2808 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2809 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2810 return CHECKOP(type, pvop);
79072805
LW		 2811}
2812
79072805 2813void
864dbfa3 2814Perl_package(pTHX_ OP *o)
79072805 2815{
de11ba31
AMS		 2816 char *name;
2817 STRLEN len;
79072805 2818
3280af22
NIS		 2819 save_hptr(&PL_curstash);
2820 save_item(PL_curstname);
de11ba31
AMS		 2821
2822 name = SvPV(cSVOPo->op_sv, len);
2823 PL_curstash = gv_stashpvn(name, len, TRUE);
2824 sv_setpvn(PL_curstname, name, len);
2825 op_free(o);
2826
7ad382f4 2827 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 2828 PL_copline = NOLINE;
2829 PL_expect = XSTATE;
79072805
LW		 2830}
2831
85e6fe83 2832void
88d95a4d 2833Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *idop, OP *arg)
85e6fe83 2834{
a0d0e21e 2835 OP *pack;
a0d0e21e 2836 OP *imop;
b1cb66bf 2837 OP *veop;
85e6fe83 2838
88d95a4d 2839 if (idop->op_type != OP_CONST)
cea2e8a9 2840 Perl_croak(aTHX_ "Module name must be constant");
85e6fe83 2841
b1cb66bf 2842 veop = Nullop;
2843
0f79a09d 2844 if (version != Nullop) {
b1cb66bf 2845 SV *vesv = ((SVOP*)version)->op_sv;
2846
44dcb63b 2847 if (arg == Nullop && !SvNIOKp(vesv)) {
b1cb66bf 2848 arg = version;
2849 }
2850 else {
2851 OP *pack;
0f79a09d 2852 SV *meth;
b1cb66bf 2853
44dcb63b 2854 if (version->op_type != OP_CONST || !SvNIOKp(vesv))
cea2e8a9 2855 Perl_croak(aTHX_ "Version number must be constant number");
b1cb66bf 2856
88d95a4d
JH		 2857 /* Make copy of idop so we don't free it twice */
2858 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
b1cb66bf 2859
2860 /* Fake up a method call to VERSION */
0f79a09d
GS		 2861 meth = newSVpvn("VERSION",7);
2862 sv_upgrade(meth, SVt_PVIV);
155aba94 2863 (void)SvIOK_on(meth);
5afd6d42 2864 PERL_HASH(SvUVX(meth), SvPVX(meth), SvCUR(meth));
b1cb66bf 2865 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2866 append_elem(OP_LIST,
0f79a09d
GS		 2867 prepend_elem(OP_LIST, pack, list(version)),
2868 newSVOP(OP_METHOD_NAMED, 0, meth)));
b1cb66bf 2869 }
2870 }
aeea060c 2871
a0d0e21e 2872 /* Fake up an import/unimport */
4633a7c4
LW		 2873 if (arg && arg->op_type == OP_STUB)
2874 imop = arg; /* no import on explicit () */
88d95a4d 2875 else if (SvNIOKp(((SVOP*)idop)->op_sv)) {
b1cb66bf 2876 imop = Nullop; /* use 5.0; */
2877 }
4633a7c4 2878 else {
0f79a09d
GS		 2879 SV *meth;
2880
88d95a4d
JH		 2881 /* Make copy of idop so we don't free it twice */
2882 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
0f79a09d
GS		 2883
2884 /* Fake up a method call to import/unimport */
b47cad08 2885 meth = aver ? newSVpvn("import",6) : newSVpvn("unimport", 8);
ad4c42df 2886 (void)SvUPGRADE(meth, SVt_PVIV);
155aba94 2887 (void)SvIOK_on(meth);
5afd6d42 2888 PERL_HASH(SvUVX(meth), SvPVX(meth), SvCUR(meth));
4633a7c4 2889 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
0f79a09d
GS		 2890 append_elem(OP_LIST,
2891 prepend_elem(OP_LIST, pack, list(arg)),
2892 newSVOP(OP_METHOD_NAMED, 0, meth)));
4633a7c4
LW		 2893 }
2894
a0d0e21e 2895 /* Fake up the BEGIN {}, which does its thing immediately. */
09bef843 2896 newATTRSUB(floor,
79cb57f6 2897 newSVOP(OP_CONST, 0, newSVpvn("BEGIN", 5)),
4633a7c4 2898 Nullop,
09bef843 2899 Nullop,
a0d0e21e 2900 append_elem(OP_LINESEQ,
b1cb66bf 2901 append_elem(OP_LINESEQ,
88d95a4d 2902 newSTATEOP(0, Nullch, newUNOP(OP_REQUIRE, 0, idop)),
b1cb66bf 2903 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2904 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2905
70f5e4ed
JH		 2906 /* The "did you use incorrect case?" warning used to be here.
2907 * The problem is that on case-insensitive filesystems one
2908 * might get false positives for "use" (and "require"):
2909 * "use Strict" or "require CARP" will work. This causes
2910 * portability problems for the script: in case-strict
2911 * filesystems the script will stop working.
2912 *
2913 * The "incorrect case" warning checked whether "use Foo"
2914 * imported "Foo" to your namespace, but that is wrong, too:
2915 * there is no requirement nor promise in the language that
2916 * a Foo.pm should or would contain anything in package "Foo".
2917 *
2918 * There is very little Configure-wise that can be done, either:
2919 * the case-sensitivity of the build filesystem of Perl does not
2920 * help in guessing the case-sensitivity of the runtime environment.
2921 */
18fc9488 2922
c305c6a0 2923 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 2924 PL_copline = NOLINE;
2925 PL_expect = XSTATE;
8ec8fbef 2926 PL_cop_seqmax++; /* Purely for B::*'s benefit */
85e6fe83
LW		 2927}
2928
7d3fb230 2929/*
ccfc67b7
JH		 2930=head1 Embedding Functions
2931
7d3fb230
BS		 2932=for apidoc load_module
2933
2934Loads the module whose name is pointed to by the string part of name.
2935Note that the actual module name, not its filename, should be given.
2936Eg, "Foo::Bar" instead of "Foo/Bar.pm". flags can be any of
2937PERL_LOADMOD_DENY, PERL_LOADMOD_NOIMPORT, or PERL_LOADMOD_IMPORT_OPS
2938(or 0 for no flags). ver, if specified, provides version semantics
2939similar to C<use Foo::Bar VERSION>. The optional trailing SV*
2940arguments can be used to specify arguments to the module's import()
2941method, similar to C<use Foo::Bar VERSION LIST>.
2942
2943=cut */
2944
e4783991
GS		 2945void
2946Perl_load_module(pTHX_ U32 flags, SV *name, SV *ver, ...)
2947{
2948 va_list args;
2949 va_start(args, ver);
2950 vload_module(flags, name, ver, &args);
2951 va_end(args);
2952}
2953
2954#ifdef PERL_IMPLICIT_CONTEXT
2955void
2956Perl_load_module_nocontext(U32 flags, SV *name, SV *ver, ...)
2957{
2958 dTHX;
2959 va_list args;
2960 va_start(args, ver);
2961 vload_module(flags, name, ver, &args);
2962 va_end(args);
2963}
2964#endif
2965
2966void
2967Perl_vload_module(pTHX_ U32 flags, SV *name, SV *ver, va_list *args)
2968{
2969 OP *modname, *veop, *imop;
2970
2971 modname = newSVOP(OP_CONST, 0, name);
2972 modname->op_private |= OPpCONST_BARE;
2973 if (ver) {
2974 veop = newSVOP(OP_CONST, 0, ver);
2975 }
2976 else
2977 veop = Nullop;
2978 if (flags & PERL_LOADMOD_NOIMPORT) {
2979 imop = sawparens(newNULLLIST());
2980 }
2981 else if (flags & PERL_LOADMOD_IMPORT_OPS) {
2982 imop = va_arg(*args, OP*);
2983 }
2984 else {
2985 SV *sv;
2986 imop = Nullop;
2987 sv = va_arg(*args, SV*);
2988 while (sv) {
2989 imop = append_elem(OP_LIST, imop, newSVOP(OP_CONST, 0, sv));
2990 sv = va_arg(*args, SV*);
2991 }
2992 }
81885997
GS		 2993 {
2994 line_t ocopline = PL_copline;
834a3ffa 2995 COP *ocurcop = PL_curcop;
81885997
GS		 2996 int oexpect = PL_expect;
2997
2998 utilize(!(flags & PERL_LOADMOD_DENY), start_subparse(FALSE, 0),
2999 veop, modname, imop);
3000 PL_expect = oexpect;
3001 PL_copline = ocopline;
834a3ffa 3002 PL_curcop = ocurcop;
81885997 3003 }
e4783991
GS		 3004}
3005
79072805 3006OP *
864dbfa3 3007Perl_dofile(pTHX_ OP *term)
78ca652e
GS		 3008{
3009 OP *doop;
3010 GV *gv;
3011
3012 gv = gv_fetchpv("do", FALSE, SVt_PVCV);
b9f751c0 3013 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv)))
78ca652e
GS		 3014 gv = gv_fetchpv("CORE::GLOBAL::do", FALSE, SVt_PVCV);
3015
b9f751c0 3016 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
78ca652e
GS		 3017 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
3018 append_elem(OP_LIST, term,
3019 scalar(newUNOP(OP_RV2CV, 0,
3020 newGVOP(OP_GV, 0,
3021 gv))))));
3022 }
3023 else {
3024 doop = newUNOP(OP_DOFILE, 0, scalar(term));
3025 }
3026 return doop;
3027}
3028
3029OP *
864dbfa3 3030Perl_newSLICEOP(pTHX_ I32 flags, OP *subscript, OP *listval)
79072805
LW		 3031{
3032 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 3033 list(force_list(subscript)),
3034 list(force_list(listval)) );
79072805
LW		 3035}
3036
76e3520e 3037STATIC I32
cea2e8a9 3038S_list_assignment(pTHX_ register OP *o)
79072805 3039{
11343788 3040 if (!o)
79072805
LW		 3041 return TRUE;
3042
11343788
MB		 3043 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
3044 o = cUNOPo->op_first;
79072805 3045
11343788 3046 if (o->op_type == OP_COND_EXPR) {
1a67a97c
SM		 3047 I32 t = list_assignment(cLOGOPo->op_first->op_sibling);
3048 I32 f = list_assignment(cLOGOPo->op_first->op_sibling->op_sibling);
79072805
LW		 3049
3050 if (t && f)
3051 return TRUE;
3052 if (t || f)
3053 yyerror("Assignment to both a list and a scalar");
3054 return FALSE;
3055 }
3056
95f0a2f1
SB		 3057 if (o->op_type == OP_LIST &&
3058 (o->op_flags & OPf_WANT) == OPf_WANT_SCALAR &&
3059 o->op_private & OPpLVAL_INTRO)
3060 return FALSE;
3061
11343788
MB		 3062 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
3063 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
3064 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 3065 return TRUE;
3066
11343788 3067 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 3068 return TRUE;
3069
11343788 3070 if (o->op_type == OP_RV2SV)
79072805
LW		 3071 return FALSE;
3072
3073 return FALSE;
3074}
3075
3076OP *
864dbfa3 3077Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
79072805 3078{
11343788 3079 OP *o;
79072805 3080
a0d0e21e 3081 if (optype) {
c963b151 3082 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN || optype == OP_DORASSIGN) {
a0d0e21e
LW		 3083 return newLOGOP(optype, 0,
3084 mod(scalar(left), optype),
3085 newUNOP(OP_SASSIGN, 0, scalar(right)));
3086 }
3087 else {
3088 return newBINOP(optype, OPf_STACKED,
3089 mod(scalar(left), optype), scalar(right));
3090 }
3091 }
3092
79072805 3093 if (list_assignment(left)) {
10c8fecd
GS		 3094 OP *curop;
3095
3280af22
NIS		 3096 PL_modcount = 0;
3097 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 3098 left = mod(left, OP_AASSIGN);
3280af22
NIS		 3099 if (PL_eval_start)
3100 PL_eval_start = 0;
748a9306 3101 else {
a0d0e21e
LW		 3102 op_free(left);
3103 op_free(right);
3104 return Nullop;
3105 }
10c8fecd
GS		 3106 curop = list(force_list(left));
3107 o = newBINOP(OP_AASSIGN, flags, list(force_list(right)), curop);
eb160463 3108 o->op_private = (U8)(0 | (flags >> 8));
dd2155a4
DM		 3109
3110 /* PL_generation sorcery:
3111 * an assignment like ($a,$b) = ($c,$d) is easier than
3112 * ($a,$b) = ($c,$a), since there is no need for temporary vars.
3113 * To detect whether there are common vars, the global var
3114 * PL_generation is incremented for each assign op we compile.
3115 * Then, while compiling the assign op, we run through all the
3116 * variables on both sides of the assignment, setting a spare slot
3117 * in each of them to PL_generation. If any of them already have
3118 * that value, we know we've got commonality. We could use a
3119 * single bit marker, but then we'd have to make 2 passes, first
3120 * to clear the flag, then to test and set it. To find somewhere
3121 * to store these values, evil chicanery is done with SvCUR().
3122 */
3123
a0d0e21e 3124 if (!(left->op_private & OPpLVAL_INTRO)) {
11343788 3125 OP *lastop = o;
3280af22 3126 PL_generation++;
11343788 3127 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 3128 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 3129 if (curop->op_type == OP_GV) {
638eceb6 3130 GV *gv = cGVOPx_gv(curop);
eb160463 3131 if (gv == PL_defgv || (int)SvCUR(gv) == PL_generation)
79072805 3132 break;
3280af22 3133 SvCUR(gv) = PL_generation;
79072805 3134 }
748a9306
LW		 3135 else if (curop->op_type == OP_PADSV ||
3136 curop->op_type == OP_PADAV ||
3137 curop->op_type == OP_PADHV ||
dd2155a4
DM		 3138 curop->op_type == OP_PADANY)
3139 {
3140 if (PAD_COMPNAME_GEN(curop->op_targ)
92251a1e 3141 == (STRLEN)PL_generation)
748a9306 3142 break;
dd2155a4
DM		 3143 PAD_COMPNAME_GEN(curop->op_targ)
3144 = PL_generation;
3145
748a9306 3146 }
79072805
LW		 3147 else if (curop->op_type == OP_RV2CV)
3148 break;
3149 else if (curop->op_type == OP_RV2SV ||
3150 curop->op_type == OP_RV2AV ||
3151 curop->op_type == OP_RV2HV ||
3152 curop->op_type == OP_RV2GV) {
3153 if (lastop->op_type != OP_GV) /* funny deref? */
3154 break;
3155 }
1167e5da
SM		 3156 else if (curop->op_type == OP_PUSHRE) {
3157 if (((PMOP*)curop)->op_pmreplroot) {
b3f5893f 3158#ifdef USE_ITHREADS
dd2155a4
DM		 3159 GV *gv = (GV*)PAD_SVl(INT2PTR(PADOFFSET,
3160 ((PMOP*)curop)->op_pmreplroot));
b3f5893f 3161#else
1167e5da 3162 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
b3f5893f 3163#endif
eb160463 3164 if (gv == PL_defgv || (int)SvCUR(gv) == PL_generation)
1167e5da 3165 break;
3280af22 3166 SvCUR(gv) = PL_generation;
b2ffa427 3167 }
1167e5da 3168 }
79072805
LW		 3169 else
3170 break;
3171 }
3172 lastop = curop;
3173 }
11343788 3174 if (curop != o)
10c8fecd 3175 o->op_private |= OPpASSIGN_COMMON;
79072805 3176 }
c07a80fd 3177 if (right && right->op_type == OP_SPLIT) {
3178 OP* tmpop;
3179 if ((tmpop = ((LISTOP*)right)->op_first) &&
3180 tmpop->op_type == OP_PUSHRE)
3181 {
3182 PMOP *pm = (PMOP*)tmpop;
3183 if (left->op_type == OP_RV2AV &&
3184 !(left->op_private & OPpLVAL_INTRO) &&
11343788 3185 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 3186 {
3187 tmpop = ((UNOP*)left)->op_first;
3188 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
971a9dd3 3189#ifdef USE_ITHREADS
ba89bb6e 3190 pm->op_pmreplroot = INT2PTR(OP*, cPADOPx(tmpop)->op_padix);
971a9dd3
GS		 3191 cPADOPx(tmpop)->op_padix = 0; /* steal it */
3192#else
3193 pm->op_pmreplroot = (OP*)cSVOPx(tmpop)->op_sv;
3194 cSVOPx(tmpop)->op_sv = Nullsv; /* steal it */
3195#endif
c07a80fd 3196 pm->op_pmflags |= PMf_ONCE;
11343788 3197 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 3198 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
3199 tmpop->op_sibling = Nullop; /* don't free split */
3200 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 3201 op_free(o); /* blow off assign */
54310121 3202 right->op_flags &= ~OPf_WANT;
a5f75d66 3203 /* "I don't know and I don't care." */
c07a80fd 3204 return right;
3205 }
3206 }
3207 else {
e6438c1a 3208 if (PL_modcount < RETURN_UNLIMITED_NUMBER &&
c07a80fd 3209 ((LISTOP*)right)->op_last->op_type == OP_CONST)
3210 {
3211 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
3212 if (SvIVX(sv) == 0)
3280af22 3213 sv_setiv(sv, PL_modcount+1);
c07a80fd 3214 }
3215 }
3216 }
3217 }
11343788 3218 return o;
79072805
LW		 3219 }
3220 if (!right)
3221 right = newOP(OP_UNDEF, 0);
3222 if (right->op_type == OP_READLINE) {
3223 right->op_flags |= OPf_STACKED;
463ee0b2 3224 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 3225 }
a0d0e21e 3226 else {
3280af22 3227 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 3228 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 3229 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 3230 if (PL_eval_start)
3231 PL_eval_start = 0;
748a9306 3232 else {
11343788 3233 op_free(o);
a0d0e21e
LW		 3234 return Nullop;
3235 }
3236 }
11343788 3237 return o;
79072805
LW		 3238}
3239
3240OP *
864dbfa3 3241Perl_newSTATEOP(pTHX_ I32 flags, char *label, OP *o)
79072805 3242{
bbce6d69 3243 U32 seq = intro_my();
79072805
LW		 3244 register COP *cop;
3245
b7dc083c 3246 NewOp(1101, cop, 1, COP);
57843af0 3247 if (PERLDB_LINE && CopLINE(PL_curcop) && PL_curstash != PL_debstash) {
8990e307 3248 cop->op_type = OP_DBSTATE;
22c35a8c 3249 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 3250 }
3251 else {
3252 cop->op_type = OP_NEXTSTATE;
22c35a8c 3253 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 3254 }
eb160463
GS		 3255 cop->op_flags = (U8)flags;
3256 cop->op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
ff0cee69 3257#ifdef NATIVE_HINTS
3258 cop->op_private |= NATIVE_HINTS;
3259#endif
e24b16f9 3260 PL_compiling.op_private = cop->op_private;
79072805
LW		 3261 cop->op_next = (OP*)cop;
3262
463ee0b2
LW		 3263 if (label) {
3264 cop->cop_label = label;
3280af22 3265 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 3266 }
bbce6d69 3267 cop->cop_seq = seq;
3280af22 3268 cop->cop_arybase = PL_curcop->cop_arybase;
0453d815 3269 if (specialWARN(PL_curcop->cop_warnings))
599cee73 3270 cop->cop_warnings = PL_curcop->cop_warnings ;
1c846c1f 3271 else
599cee73 3272 cop->cop_warnings = newSVsv(PL_curcop->cop_warnings) ;
ac27b0f5
NIS		 3273 if (specialCopIO(PL_curcop->cop_io))
3274 cop->cop_io = PL_curcop->cop_io;
3275 else
3276 cop->cop_io = newSVsv(PL_curcop->cop_io) ;
599cee73 3277
79072805 3278
3280af22 3279 if (PL_copline == NOLINE)
57843af0 3280 CopLINE_set(cop, CopLINE(PL_curcop));
79072805 3281 else {
57843af0 3282 CopLINE_set(cop, PL_copline);
3280af22 3283 PL_copline = NOLINE;
79072805 3284 }
57843af0 3285#ifdef USE_ITHREADS
f4dd75d9 3286 CopFILE_set(cop, CopFILE(PL_curcop)); /* XXX share in a pvtable? */
57843af0 3287#else
f4dd75d9 3288 CopFILEGV_set(cop, CopFILEGV(PL_curcop));
57843af0 3289#endif
11faa288 3290 CopSTASH_set(cop, PL_curstash);
79072805 3291
3280af22 3292 if (PERLDB_LINE && PL_curstash != PL_debstash) {
cc49e20b 3293 SV **svp = av_fetch(CopFILEAV(PL_curcop), (I32)CopLINE(cop), FALSE);
1eb1540c 3294 if (svp && *svp != &PL_sv_undef ) {
0ac0412a 3295 (void)SvIOK_on(*svp);
57b2e452 3296 SvIVX(*svp) = PTR2IV(cop);
1eb1540c 3297 }
93a17b20
LW		 3298 }
3299
11343788 3300 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3301}
3302
bbce6d69 3303
79072805 3304OP *
864dbfa3 3305Perl_newLOGOP(pTHX_ I32 type, I32 flags, OP *first, OP *other)
79072805 3306{
883ffac3
CS		 3307 return new_logop(type, flags, &first, &other);
3308}
3309
3bd495df 3310STATIC OP *
cea2e8a9 3311S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
883ffac3 3312{
79072805 3313 LOGOP *logop;
11343788 3314 OP *o;
883ffac3
CS		 3315 OP *first = *firstp;
3316 OP *other = *otherp;
79072805 3317
a0d0e21e
LW		 3318 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
3319 return newBINOP(type, flags, scalar(first), scalar(other));
3320
8990e307 3321 scalarboolean(first);
79072805
LW		 3322 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
3323 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
3324 if (type == OP_AND || type == OP_OR) {
3325 if (type == OP_AND)
3326 type = OP_OR;
3327 else
3328 type = OP_AND;
11343788 3329 o = first;
883ffac3 3330 first = *firstp = cUNOPo->op_first;
11343788
MB		 3331 if (o->op_next)
3332 first->op_next = o->op_next;
3333 cUNOPo->op_first = Nullop;
3334 op_free(o);
79072805
LW		 3335 }
3336 }
3337 if (first->op_type == OP_CONST) {
989dfb19 3338 if (ckWARN(WARN_BAREWORD) && (first->op_private & OPpCONST_BARE)) {
6d5637c3 3339 if (first->op_private & OPpCONST_STRICT)
989dfb19
K		 3340 no_bareword_allowed(first);
3341 else
3342 Perl_warner(aTHX_ packWARN(WARN_BAREWORD), "Bareword found in conditional");
3343 }
79072805
LW		 3344 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
3345 op_free(first);
883ffac3 3346 *firstp = Nullop;
79072805
LW		 3347 return other;
3348 }
3349 else {
3350 op_free(other);
883ffac3 3351 *otherp = Nullop;
79072805
LW		 3352 return first;
3353 }
3354 }
59e10468
RGS		 3355 else if (ckWARN(WARN_MISC) && (first->op_flags & OPf_KIDS) &&
3356 type != OP_DOR) /* [#24076] Don't warn for <FH> err FOO. */
3357 {
a6006777 3358 OP *k1 = ((UNOP*)first)->op_first;
3359 OP *k2 = k1->op_sibling;
3360 OPCODE warnop = 0;
3361 switch (first->op_type)
3362 {
3363 case OP_NULL:
3364 if (k2 && k2->op_type == OP_READLINE
3365 && (k2->op_flags & OPf_STACKED)
1c846c1f 3366 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
72b16652 3367 {
a6006777 3368 warnop = k2->op_type;
72b16652 3369 }
a6006777 3370 break;
3371
3372 case OP_SASSIGN:
68dc0745 3373 if (k1->op_type == OP_READDIR
3374 || k1->op_type == OP_GLOB
72b16652 3375 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
68dc0745 3376 || k1->op_type == OP_EACH)
72b16652
GS		 3377 {
3378 warnop = ((k1->op_type == OP_NULL)
eb160463 3379 ? (OPCODE)k1->op_targ : k1->op_type);
72b16652 3380 }
a6006777 3381 break;
3382 }
8ebc5c01 3383 if (warnop) {
57843af0
GS		 3384 line_t oldline = CopLINE(PL_curcop);
3385 CopLINE_set(PL_curcop, PL_copline);
9014280d 3386 Perl_warner(aTHX_ packWARN(WARN_MISC),
599cee73 3387 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 3388 PL_op_desc[warnop],
68dc0745 3389 ((warnop == OP_READLINE || warnop == OP_GLOB)
3390 ? " construct" : "() operator"));
57843af0 3391 CopLINE_set(PL_curcop, oldline);
8ebc5c01 3392 }
a6006777 3393 }
79072805
LW		 3394
3395 if (!other)
3396 return first;
3397
c963b151 3398 if (type == OP_ANDASSIGN || type == OP_ORASSIGN || type == OP_DORASSIGN)
a0d0e21e
LW		 3399 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
3400
b7dc083c 3401 NewOp(1101, logop, 1, LOGOP);
79072805 3402
eb160463 3403 logop->op_type = (OPCODE)type;
22c35a8c 3404 logop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3405 logop->op_first = first;
3406 logop->op_flags = flags | OPf_KIDS;
3407 logop->op_other = LINKLIST(other);
eb160463 3408 logop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 3409
3410 /* establish postfix order */
3411 logop->op_next = LINKLIST(first);
3412 first->op_next = (OP*)logop;
3413 first->op_sibling = other;
3414
463d09e6
RGS		 3415 CHECKOP(type,logop);
3416
11343788
MB		 3417 o = newUNOP(OP_NULL, 0, (OP*)logop);
3418 other->op_next = o;
79072805 3419
11343788 3420 return o;
79072805
LW		 3421}
3422
3423OP *
864dbfa3 3424Perl_newCONDOP(pTHX_ I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 3425{
1a67a97c
SM		 3426 LOGOP *logop;
3427 OP *start;
11343788 3428 OP *o;
79072805 3429
b1cb66bf 3430 if (!falseop)
3431 return newLOGOP(OP_AND, 0, first, trueop);
3432 if (!trueop)
3433 return newLOGOP(OP_OR, 0, first, falseop);
79072805 3434
8990e307 3435 scalarboolean(first);
79072805 3436 if (first->op_type == OP_CONST) {
2bc6235c
K		 3437 if (first->op_private & OPpCONST_BARE &&
3438 first->op_private & OPpCONST_STRICT) {
3439 no_bareword_allowed(first);
3440 }
79072805
LW		 3441 if (SvTRUE(((SVOP*)first)->op_sv)) {
3442 op_free(first);
b1cb66bf 3443 op_free(falseop);
3444 return trueop;
79072805
LW		 3445 }
3446 else {
3447 op_free(first);
b1cb66bf 3448 op_free(trueop);
3449 return falseop;
79072805
LW		 3450 }
3451 }
1a67a97c
SM		 3452 NewOp(1101, logop, 1, LOGOP);
3453 logop->op_type = OP_COND_EXPR;
3454 logop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
3455 logop->op_first = first;
3456 logop->op_flags = flags | OPf_KIDS;
eb160463 3457 logop->op_private = (U8)(1 | (flags >> 8));
1a67a97c
SM		 3458 logop->op_other = LINKLIST(trueop);
3459 logop->op_next = LINKLIST(falseop);
79072805 3460
463d09e6
RGS		 3461 CHECKOP(OP_COND_EXPR, /* that's logop->op_type */
3462 logop);
79072805
LW		 3463
3464 /* establish postfix order */
1a67a97c
SM		 3465 start = LINKLIST(first);
3466 first->op_next = (OP*)logop;
79072805 3467
b1cb66bf 3468 first->op_sibling = trueop;
3469 trueop->op_sibling = falseop;
1a67a97c 3470 o = newUNOP(OP_NULL, 0, (OP*)logop);
79072805 3471
1a67a97c 3472 trueop->op_next = falseop->op_next = o;
79072805 3473
1a67a97c 3474 o->op_next = start;
11343788 3475 return o;
79072805
LW		 3476}
3477
3478OP *
864dbfa3 3479Perl_newRANGE(pTHX_ I32 flags, OP *left, OP *right)
79072805 3480{
1a67a97c 3481 LOGOP *range;
79072805
LW		 3482 OP *flip;
3483 OP *flop;
1a67a97c 3484 OP *leftstart;
11343788 3485 OP *o;
79072805 3486
1a67a97c 3487 NewOp(1101, range, 1, LOGOP);
79072805 3488
1a67a97c
SM		 3489 range->op_type = OP_RANGE;
3490 range->op_ppaddr = PL_ppaddr[OP_RANGE];
3491 range->op_first = left;
3492 range->op_flags = OPf_KIDS;
3493 leftstart = LINKLIST(left);
3494 range->op_other = LINKLIST(right);
eb160463 3495 range->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 3496
3497 left->op_sibling = right;
3498
1a67a97c
SM		 3499 range->op_next = (OP*)range;
3500 flip = newUNOP(OP_FLIP, flags, (OP*)range);
79072805 3501 flop = newUNOP(OP_FLOP, 0, flip);
11343788 3502 o = newUNOP(OP_NULL, 0, flop);
79072805 3503 linklist(flop);
1a67a97c 3504 range->op_next = leftstart;
79072805
LW		 3505
3506 left->op_next = flip;
3507 right->op_next = flop;
3508
1a67a97c
SM		 3509 range->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
3510 sv_upgrade(PAD_SV(range->op_targ), SVt_PVNV);
ed6116ce 3511 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 3512 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
3513
3514 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3515 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3516
11343788 3517 flip->op_next = o;
79072805 3518 if (!flip->op_private || !flop->op_private)
11343788 3519 linklist(o); /* blow off optimizer unless constant */
79072805 3520
11343788 3521 return o;
79072805
LW		 3522}
3523
3524OP *
864dbfa3 3525Perl_newLOOPOP(pTHX_ I32 flags, I32 debuggable, OP *expr, OP *block)