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[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) {
083fcd59
JH		 81 #ifdef NETWARE
82 #define PerlMemShared PerlMem
83 #endif
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;
a0d0e21e 1826 return;
6be89cf9 1827 }
3280af22
NIS		 1828 PL_main_root = scope(sawparens(scalarvoid(o)));
1829 PL_curcop = &PL_compiling;
1830 PL_main_start = LINKLIST(PL_main_root);
7934575e
GS		 1831 PL_main_root->op_private |= OPpREFCOUNTED;
1832 OpREFCNT_set(PL_main_root, 1);
3280af22 1833 PL_main_root->op_next = 0;
a2efc822 1834 CALL_PEEP(PL_main_start);
3280af22 1835 PL_compcv = 0;
3841441e 1836
4fdae800 1837 /* Register with debugger */
84902520 1838 if (PERLDB_INTER) {
864dbfa3 1839 CV *cv = get_cv("DB::postponed", FALSE);
3841441e
CS		 1840 if (cv) {
1841 dSP;
924508f0 1842 PUSHMARK(SP);
cc49e20b 1843 XPUSHs((SV*)CopFILEGV(&PL_compiling));
3841441e 1844 PUTBACK;
864dbfa3 1845 call_sv((SV*)cv, G_DISCARD);
3841441e
CS		 1846 }
1847 }
79072805 1848 }
79072805
LW		 1849}
1850
1851OP *
864dbfa3 1852Perl_localize(pTHX_ OP *o, I32 lex)
79072805
LW		 1853{
1854 if (o->op_flags & OPf_PARENS)
d2be0de5
YST		 1855/* [perl #17376]: this appears to be premature, and results in code such as
1856 C< our(%x); > executing in list mode rather than void mode */
1857#if 0
79072805 1858 list(o);
d2be0de5
YST		 1859#else
1860 ;
1861#endif
8990e307 1862 else {
64420d0d
JH		 1863 if (ckWARN(WARN_PARENTHESIS)
1864 && PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ',')
1865 {
1866 char *s = PL_bufptr;
8473848f 1867 int sigil = 0;
64420d0d 1868
8473848f
RGS		 1869 /* some heuristics to detect a potential error */
1870 while (*s && (strchr(", \t\n", *s)
1871 || (strchr("@$%*", *s) && ++sigil) ))
64420d0d 1872 s++;
8473848f
RGS		 1873 if (sigil) {
1874 while (*s && (isALNUM(*s) || UTF8_IS_CONTINUED(*s)
1875 || strchr("@$%*, \t\n", *s)))
1876 s++;
1877
1878 if (*s == ';' || *s == '=')
1879 Perl_warner(aTHX_ packWARN(WARN_PARENTHESIS),
1880 "Parentheses missing around \"%s\" list",
1881 lex ? (PL_in_my == KEY_our ? "our" : "my")
1882 : "local");
1883 }
8990e307
LW		 1884 }
1885 }
93a17b20 1886 if (lex)
eb64745e 1887 o = my(o);
93a17b20 1888 else
eb64745e
GS		 1889 o = mod(o, OP_NULL); /* a bit kludgey */
1890 PL_in_my = FALSE;
1891 PL_in_my_stash = Nullhv;
1892 return o;
79072805
LW		 1893}
1894
1895OP *
864dbfa3 1896Perl_jmaybe(pTHX_ OP *o)
79072805
LW		 1897{
1898 if (o->op_type == OP_LIST) {
554b3eca 1899 OP *o2;
554b3eca 1900 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
554b3eca 1901 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 1902 }
1903 return o;
1904}
1905
1906OP *
864dbfa3 1907Perl_fold_constants(pTHX_ register OP *o)
79072805
LW		 1908{
1909 register OP *curop;
1910 I32 type = o->op_type;
748a9306 1911 SV *sv;
79072805 1912
22c35a8c 1913 if (PL_opargs[type] & OA_RETSCALAR)
79072805 1914 scalar(o);
b162f9ea 1915 if (PL_opargs[type] & OA_TARGET && !o->op_targ)
ed6116ce 1916 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1917
eac055e9
GS		 1918 /* integerize op, unless it happens to be C<-foo>.
1919 * XXX should pp_i_negate() do magic string negation instead? */
1920 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)
1921 && !(type == OP_NEGATE && cUNOPo->op_first->op_type == OP_CONST
1922 && (cUNOPo->op_first->op_private & OPpCONST_BARE)))
1923 {
22c35a8c 1924 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
eac055e9 1925 }
85e6fe83 1926
22c35a8c 1927 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 1928 goto nope;
1929
de939608 1930 switch (type) {
7a52d87a
GS		 1931 case OP_NEGATE:
1932 /* XXX might want a ck_negate() for this */
1933 cUNOPo->op_first->op_private &= ~OPpCONST_STRICT;
1934 break;
de939608
CS		 1935 case OP_SPRINTF:
1936 case OP_UCFIRST:
1937 case OP_LCFIRST:
1938 case OP_UC:
1939 case OP_LC:
69dcf70c
MB		 1940 case OP_SLT:
1941 case OP_SGT:
1942 case OP_SLE:
1943 case OP_SGE:
1944 case OP_SCMP:
2de3dbcc
JH		 1945 /* XXX what about the numeric ops? */
1946 if (PL_hints & HINT_LOCALE)
de939608
CS		 1947 goto nope;
1948 }
1949
3280af22 1950 if (PL_error_count)
a0d0e21e
LW		 1951 goto nope; /* Don't try to run w/ errors */
1952
79072805 1953 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
11fa937b
GS		 1954 if ((curop->op_type != OP_CONST ||
1955 (curop->op_private & OPpCONST_BARE)) &&
7a52d87a
GS		 1956 curop->op_type != OP_LIST &&
1957 curop->op_type != OP_SCALAR &&
1958 curop->op_type != OP_NULL &&
1959 curop->op_type != OP_PUSHMARK)
1960 {
79072805
LW		 1961 goto nope;
1962 }
1963 }
1964
1965 curop = LINKLIST(o);
1966 o->op_next = 0;
533c011a 1967 PL_op = curop;
cea2e8a9 1968 CALLRUNOPS(aTHX);
3280af22 1969 sv = *(PL_stack_sp--);
748a9306 1970 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
dd2155a4 1971 pad_swipe(o->op_targ, FALSE);
748a9306
LW		 1972 else if (SvTEMP(sv)) { /* grab mortal temp? */
1973 (void)SvREFCNT_inc(sv);
1974 SvTEMP_off(sv);
85e6fe83 1975 }
79072805
LW		 1976 op_free(o);
1977 if (type == OP_RV2GV)
b1cb66bf 1978 return newGVOP(OP_GV, 0, (GV*)sv);
52a96ae6 1979 return newSVOP(OP_CONST, 0, sv);
aeea060c 1980
79072805 1981 nope:
79072805
LW		 1982 return o;
1983}
1984
1985OP *
864dbfa3 1986Perl_gen_constant_list(pTHX_ register OP *o)
79072805
LW		 1987{
1988 register OP *curop;
3280af22 1989 I32 oldtmps_floor = PL_tmps_floor;
79072805 1990
a0d0e21e 1991 list(o);
3280af22 1992 if (PL_error_count)
a0d0e21e
LW		 1993 return o; /* Don't attempt to run with errors */
1994
533c011a 1995 PL_op = curop = LINKLIST(o);
a0d0e21e 1996 o->op_next = 0;
a2efc822 1997 CALL_PEEP(curop);
cea2e8a9
GS		 1998 pp_pushmark();
1999 CALLRUNOPS(aTHX);
533c011a 2000 PL_op = curop;
cea2e8a9 2001 pp_anonlist();
3280af22 2002 PL_tmps_floor = oldtmps_floor;
79072805
LW		 2003
2004 o->op_type = OP_RV2AV;
22c35a8c 2005 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
fb53bbb2
SG		 2006 o->op_flags &= ~OPf_REF; /* treat \(1..2) like an ordinary list */
2007 o->op_flags |= OPf_PARENS; /* and flatten \(1..2,3) */
c13f253a 2008 o->op_seq = 0; /* needs to be revisited in peep() */
79072805 2009 curop = ((UNOP*)o)->op_first;
3280af22 2010 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*PL_stack_sp--));
79072805 2011 op_free(curop);
79072805
LW		 2012 linklist(o);
2013 return list(o);
2014}
2015
2016OP *
864dbfa3 2017Perl_convert(pTHX_ I32 type, I32 flags, OP *o)
79072805 2018{
11343788
MB		 2019 if (!o || o->op_type != OP_LIST)
2020 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 2021 else
5dc0d613 2022 o->op_flags &= ~OPf_WANT;
79072805 2023
22c35a8c 2024 if (!(PL_opargs[type] & OA_MARK))
93c66552 2025 op_null(cLISTOPo->op_first);
8990e307 2026
eb160463 2027 o->op_type = (OPCODE)type;
22c35a8c 2028 o->op_ppaddr = PL_ppaddr[type];
11343788 2029 o->op_flags |= flags;
79072805 2030
11343788
MB		 2031 o = CHECKOP(type, o);
2032 if (o->op_type != type)
2033 return o;
79072805 2034
11343788 2035 return fold_constants(o);
79072805
LW		 2036}
2037
2038/* List constructors */
2039
2040OP *
864dbfa3 2041Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2042{
2043 if (!first)
2044 return last;
8990e307
LW		 2045
2046 if (!last)
79072805 2047 return first;
8990e307 2048
155aba94
GS		 2049 if (first->op_type != type
2050 || (type == OP_LIST && (first->op_flags & OPf_PARENS)))
2051 {
2052 return newLISTOP(type, 0, first, last);
2053 }
79072805 2054
a0d0e21e
LW		 2055 if (first->op_flags & OPf_KIDS)
2056 ((LISTOP*)first)->op_last->op_sibling = last;
2057 else {
2058 first->op_flags |= OPf_KIDS;
2059 ((LISTOP*)first)->op_first = last;
2060 }
2061 ((LISTOP*)first)->op_last = last;
a0d0e21e 2062 return first;
79072805
LW		 2063}
2064
2065OP *
864dbfa3 2066Perl_append_list(pTHX_ I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2067{
2068 if (!first)
2069 return (OP*)last;
8990e307
LW		 2070
2071 if (!last)
79072805 2072 return (OP*)first;
8990e307
LW		 2073
2074 if (first->op_type != type)
79072805 2075 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 2076
2077 if (last->op_type != type)
79072805
LW		 2078 return append_elem(type, (OP*)first, (OP*)last);
2079
2080 first->op_last->op_sibling = last->op_first;
2081 first->op_last = last->op_last;
117dada2 2082 first->op_flags |= (last->op_flags & OPf_KIDS);
1c846c1f 2083
238a4c30
NIS		 2084 FreeOp(last);
2085
79072805
LW		 2086 return (OP*)first;
2087}
2088
2089OP *
864dbfa3 2090Perl_prepend_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2091{
2092 if (!first)
2093 return last;
8990e307
LW		 2094
2095 if (!last)
79072805 2096 return first;
8990e307
LW		 2097
2098 if (last->op_type == type) {
2099 if (type == OP_LIST) { /* already a PUSHMARK there */
2100 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2101 ((LISTOP*)last)->op_first->op_sibling = first;
36a5d4ba
DC		 2102 if (!(first->op_flags & OPf_PARENS))
2103 last->op_flags &= ~OPf_PARENS;
8990e307
LW		 2104 }
2105 else {
2106 if (!(last->op_flags & OPf_KIDS)) {
2107 ((LISTOP*)last)->op_last = first;
2108 last->op_flags |= OPf_KIDS;
2109 }
2110 first->op_sibling = ((LISTOP*)last)->op_first;
2111 ((LISTOP*)last)->op_first = first;
79072805 2112 }
117dada2 2113 last->op_flags |= OPf_KIDS;
79072805
LW		 2114 return last;
2115 }
2116
2117 return newLISTOP(type, 0, first, last);
2118}
2119
2120/* Constructors */
2121
2122OP *
864dbfa3 2123Perl_newNULLLIST(pTHX)
79072805 2124{
8990e307
LW		 2125 return newOP(OP_STUB, 0);
2126}
2127
2128OP *
864dbfa3 2129Perl_force_list(pTHX_ OP *o)
8990e307 2130{
11343788
MB		 2131 if (!o || o->op_type != OP_LIST)
2132 o = newLISTOP(OP_LIST, 0, o, Nullop);
93c66552 2133 op_null(o);
11343788 2134 return o;
79072805
LW		 2135}
2136
2137OP *
864dbfa3 2138Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2139{
2140 LISTOP *listop;
2141
b7dc083c 2142 NewOp(1101, listop, 1, LISTOP);
79072805 2143
eb160463 2144 listop->op_type = (OPCODE)type;
22c35a8c 2145 listop->op_ppaddr = PL_ppaddr[type];
117dada2
SM		 2146 if (first || last)
2147 flags |= OPf_KIDS;
eb160463 2148 listop->op_flags = (U8)flags;
79072805
LW		 2149
2150 if (!last && first)
2151 last = first;
2152 else if (!first && last)
2153 first = last;
8990e307
LW		 2154 else if (first)
2155 first->op_sibling = last;
79072805
LW		 2156 listop->op_first = first;
2157 listop->op_last = last;
8990e307
LW		 2158 if (type == OP_LIST) {
2159 OP* pushop;
2160 pushop = newOP(OP_PUSHMARK, 0);
2161 pushop->op_sibling = first;
2162 listop->op_first = pushop;
2163 listop->op_flags |= OPf_KIDS;
2164 if (!last)
2165 listop->op_last = pushop;
2166 }
79072805 2167
463d09e6 2168 return CHECKOP(type, listop);
79072805
LW		 2169}
2170
2171OP *
864dbfa3 2172Perl_newOP(pTHX_ I32 type, I32 flags)
79072805 2173{
11343788 2174 OP *o;
b7dc083c 2175 NewOp(1101, o, 1, OP);
eb160463 2176 o->op_type = (OPCODE)type;
22c35a8c 2177 o->op_ppaddr = PL_ppaddr[type];
eb160463 2178 o->op_flags = (U8)flags;
79072805 2179
11343788 2180 o->op_next = o;
eb160463 2181 o->op_private = (U8)(0 | (flags >> 8));
22c35a8c 2182 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2183 scalar(o);
22c35a8c 2184 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2185 o->op_targ = pad_alloc(type, SVs_PADTMP);
2186 return CHECKOP(type, o);
79072805
LW		 2187}
2188
2189OP *
864dbfa3 2190Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first)
79072805
LW		 2191{
2192 UNOP *unop;
2193
93a17b20 2194 if (!first)
aeea060c 2195 first = newOP(OP_STUB, 0);
22c35a8c 2196 if (PL_opargs[type] & OA_MARK)
8990e307 2197 first = force_list(first);
93a17b20 2198
b7dc083c 2199 NewOp(1101, unop, 1, UNOP);
eb160463 2200 unop->op_type = (OPCODE)type;
22c35a8c 2201 unop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2202 unop->op_first = first;
2203 unop->op_flags = flags | OPf_KIDS;
eb160463 2204 unop->op_private = (U8)(1 | (flags >> 8));
e50aee73 2205 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2206 if (unop->op_next)
2207 return (OP*)unop;
2208
a0d0e21e 2209 return fold_constants((OP *) unop);
79072805
LW		 2210}
2211
2212OP *
864dbfa3 2213Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2214{
2215 BINOP *binop;
b7dc083c 2216 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2217
2218 if (!first)
2219 first = newOP(OP_NULL, 0);
2220
eb160463 2221 binop->op_type = (OPCODE)type;
22c35a8c 2222 binop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2223 binop->op_first = first;
2224 binop->op_flags = flags | OPf_KIDS;
2225 if (!last) {
2226 last = first;
eb160463 2227 binop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 2228 }
2229 else {
eb160463 2230 binop->op_private = (U8)(2 | (flags >> 8));
79072805
LW		 2231 first->op_sibling = last;
2232 }
2233
e50aee73 2234 binop = (BINOP*)CHECKOP(type, binop);
eb160463 2235 if (binop->op_next || binop->op_type != (OPCODE)type)
79072805
LW		 2236 return (OP*)binop;
2237
7284ab6f 2238 binop->op_last = binop->op_first->op_sibling;
79072805 2239
a0d0e21e 2240 return fold_constants((OP *)binop);
79072805
LW		 2241}
2242
a0ed51b3 2243static int
2b9d42f0
NIS		 2244uvcompare(const void *a, const void *b)
2245{
2246 if (*((UV *)a) < (*(UV *)b))
2247 return -1;
2248 if (*((UV *)a) > (*(UV *)b))
2249 return 1;
2250 if (*((UV *)a+1) < (*(UV *)b+1))
2251 return -1;
2252 if (*((UV *)a+1) > (*(UV *)b+1))
2253 return 1;
a0ed51b3
LW		 2254 return 0;
2255}
2256
79072805 2257OP *
864dbfa3 2258Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2259{
79072805
LW		 2260 SV *tstr = ((SVOP*)expr)->op_sv;
2261 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2262 STRLEN tlen;
2263 STRLEN rlen;
9b877dbb
IH		 2264 U8 *t = (U8*)SvPV(tstr, tlen);
2265 U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 2266 register I32 i;
2267 register I32 j;
a0ed51b3 2268 I32 del;
79072805 2269 I32 complement;
5d06d08e 2270 I32 squash;
9b877dbb 2271 I32 grows = 0;
79072805
LW		 2272 register short *tbl;
2273
800b4dc4 2274 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2275 complement = o->op_private & OPpTRANS_COMPLEMENT;
a0ed51b3 2276 del = o->op_private & OPpTRANS_DELETE;
5d06d08e 2277 squash = o->op_private & OPpTRANS_SQUASH;
1c846c1f 2278
036b4402
GS		 2279 if (SvUTF8(tstr))
2280 o->op_private |= OPpTRANS_FROM_UTF;
1c846c1f
NIS		 2281
2282 if (SvUTF8(rstr))
036b4402 2283 o->op_private |= OPpTRANS_TO_UTF;
79072805 2284
a0ed51b3 2285 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
79cb57f6 2286 SV* listsv = newSVpvn("# comment\n",10);
a0ed51b3
LW		 2287 SV* transv = 0;
2288 U8* tend = t + tlen;
2289 U8* rend = r + rlen;
ba210ebe 2290 STRLEN ulen;
84c133a0
RB		 2291 UV tfirst = 1;
2292 UV tlast = 0;
2293 IV tdiff;
2294 UV rfirst = 1;
2295 UV rlast = 0;
2296 IV rdiff;
2297 IV diff;
a0ed51b3
LW		 2298 I32 none = 0;
2299 U32 max = 0;
2300 I32 bits;
a0ed51b3 2301 I32 havefinal = 0;
9c5ffd7c 2302 U32 final = 0;
a0ed51b3
LW		 2303 I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2304 I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
bf4a1e57
JH		 2305 U8* tsave = NULL;
2306 U8* rsave = NULL;
2307
2308 if (!from_utf) {
2309 STRLEN len = tlen;
2310 tsave = t = bytes_to_utf8(t, &len);
2311 tend = t + len;
2312 }
2313 if (!to_utf && rlen) {
2314 STRLEN len = rlen;
2315 rsave = r = bytes_to_utf8(r, &len);
2316 rend = r + len;
2317 }
a0ed51b3 2318
2b9d42f0
NIS		 2319/* There are several snags with this code on EBCDIC:
2320 1. 0xFF is a legal UTF-EBCDIC byte (there are no illegal bytes).
2321 2. scan_const() in toke.c has encoded chars in native encoding which makes
2322 ranges at least in EBCDIC 0..255 range the bottom odd.
2323*/
2324
a0ed51b3 2325 if (complement) {
ad391ad9 2326 U8 tmpbuf[UTF8_MAXLEN+1];
2b9d42f0 2327 UV *cp;
a0ed51b3 2328 UV nextmin = 0;
2b9d42f0 2329 New(1109, cp, 2*tlen, UV);
a0ed51b3 2330 i = 0;
79cb57f6 2331 transv = newSVpvn("",0);
a0ed51b3 2332 while (t < tend) {
2b9d42f0
NIS		 2333 cp[2*i] = utf8n_to_uvuni(t, tend-t, &ulen, 0);
2334 t += ulen;
2335 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) {
a0ed51b3 2336 t++;
2b9d42f0
NIS		 2337 cp[2*i+1] = utf8n_to_uvuni(t, tend-t, &ulen, 0);
2338 t += ulen;
a0ed51b3 2339 }
2b9d42f0
NIS		 2340 else {
2341 cp[2*i+1] = cp[2*i];
2342 }
2343 i++;
a0ed51b3 2344 }
2b9d42f0 2345 qsort(cp, i, 2*sizeof(UV), uvcompare);
a0ed51b3 2346 for (j = 0; j < i; j++) {
2b9d42f0 2347 UV val = cp[2*j];
a0ed51b3
LW		 2348 diff = val - nextmin;
2349 if (diff > 0) {
9041c2e3 2350 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2351 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3 2352 if (diff > 1) {
2b9d42f0 2353 U8 range_mark = UTF_TO_NATIVE(0xff);
9041c2e3 2354 t = uvuni_to_utf8(tmpbuf, val - 1);
2b9d42f0 2355 sv_catpvn(transv, (char *)&range_mark, 1);
dfe13c55 2356 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2357 }
2358 }
2b9d42f0 2359 val = cp[2*j+1];
a0ed51b3
LW		 2360 if (val >= nextmin)
2361 nextmin = val + 1;
2362 }
9041c2e3 2363 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2364 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2b9d42f0
NIS		 2365 {
2366 U8 range_mark = UTF_TO_NATIVE(0xff);
2367 sv_catpvn(transv, (char *)&range_mark, 1);
2368 }
b851fbc1
JH		 2369 t = uvuni_to_utf8_flags(tmpbuf, 0x7fffffff,
2370 UNICODE_ALLOW_SUPER);
dfe13c55
GS		 2371 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2372 t = (U8*)SvPVX(transv);
a0ed51b3
LW		 2373 tlen = SvCUR(transv);
2374 tend = t + tlen;
455d824a 2375 Safefree(cp);
a0ed51b3
LW		 2376 }
2377 else if (!rlen && !del) {
2378 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2379 }
2380 if (!squash) {
05d340b8 2381 if ((!rlen && !del) || t == r ||
12ae5dfc 2382 (tlen == rlen && memEQ((char *)t, (char *)r, tlen)))
01ec43d0 2383 {
4757a243 2384 o->op_private |= OPpTRANS_IDENTICAL;
01ec43d0 2385 }
a0ed51b3
LW		 2386 }
2387
2388 while (t < tend || tfirst <= tlast) {
2389 /* see if we need more "t" chars */
2390 if (tfirst > tlast) {
9041c2e3 2391 tfirst = (I32)utf8n_to_uvuni(t, tend - t, &ulen, 0);
a0ed51b3 2392 t += ulen;
2b9d42f0 2393 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2394 t++;
9041c2e3 2395 tlast = (I32)utf8n_to_uvuni(t, tend - t, &ulen, 0);
a0ed51b3
LW		 2396 t += ulen;
2397 }
2398 else
2399 tlast = tfirst;
2400 }
2401
2402 /* now see if we need more "r" chars */
2403 if (rfirst > rlast) {
2404 if (r < rend) {
9041c2e3 2405 rfirst = (I32)utf8n_to_uvuni(r, rend - r, &ulen, 0);
a0ed51b3 2406 r += ulen;
2b9d42f0 2407 if (r < rend && NATIVE_TO_UTF(*r) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2408 r++;
9041c2e3 2409 rlast = (I32)utf8n_to_uvuni(r, rend - r, &ulen, 0);
a0ed51b3
LW		 2410 r += ulen;
2411 }
2412 else
2413 rlast = rfirst;
2414 }
2415 else {
2416 if (!havefinal++)
2417 final = rlast;
2418 rfirst = rlast = 0xffffffff;
2419 }
2420 }
2421
2422 /* now see which range will peter our first, if either. */
2423 tdiff = tlast - tfirst;
2424 rdiff = rlast - rfirst;
2425
2426 if (tdiff <= rdiff)
2427 diff = tdiff;
2428 else
2429 diff = rdiff;
2430
2431 if (rfirst == 0xffffffff) {
2432 diff = tdiff; /* oops, pretend rdiff is infinite */
2433 if (diff > 0)
894356b3
GS		 2434 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\tXXXX\n",
2435 (long)tfirst, (long)tlast);
a0ed51b3 2436 else
894356b3 2437 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\tXXXX\n", (long)tfirst);
a0ed51b3
LW		 2438 }
2439 else {
2440 if (diff > 0)
894356b3
GS		 2441 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\t%04lx\n",
2442 (long)tfirst, (long)(tfirst + diff),
2443 (long)rfirst);
a0ed51b3 2444 else
894356b3
GS		 2445 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\t%04lx\n",
2446 (long)tfirst, (long)rfirst);
a0ed51b3
LW		 2447
2448 if (rfirst + diff > max)
2449 max = rfirst + diff;
9b877dbb 2450 if (!grows)
45005bfb
JH		 2451 grows = (tfirst < rfirst &&
2452 UNISKIP(tfirst) < UNISKIP(rfirst + diff));
2453 rfirst += diff + 1;
a0ed51b3
LW		 2454 }
2455 tfirst += diff + 1;
2456 }
2457
2458 none = ++max;
2459 if (del)
2460 del = ++max;
2461
2462 if (max > 0xffff)
2463 bits = 32;
2464 else if (max > 0xff)
2465 bits = 16;
2466 else
2467 bits = 8;
2468
455d824a 2469 Safefree(cPVOPo->op_pv);
a0ed51b3
LW		 2470 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2471 SvREFCNT_dec(listsv);
2472 if (transv)
2473 SvREFCNT_dec(transv);
2474
45005bfb 2475 if (!del && havefinal && rlen)
b448e4fe
JH		 2476 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5,
2477 newSVuv((UV)final), 0);
a0ed51b3 2478
9b877dbb 2479 if (grows)
a0ed51b3
LW		 2480 o->op_private |= OPpTRANS_GROWS;
2481
9b877dbb
IH		 2482 if (tsave)
2483 Safefree(tsave);
2484 if (rsave)
2485 Safefree(rsave);
2486
a0ed51b3
LW		 2487 op_free(expr);
2488 op_free(repl);
2489 return o;
2490 }
2491
2492 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 2493 if (complement) {
2494 Zero(tbl, 256, short);
eb160463 2495 for (i = 0; i < (I32)tlen; i++)
ec49126f 2496 tbl[t[i]] = -1;
79072805
LW		 2497 for (i = 0, j = 0; i < 256; i++) {
2498 if (!tbl[i]) {
eb160463 2499 if (j >= (I32)rlen) {
a0ed51b3 2500 if (del)
79072805
LW		 2501 tbl[i] = -2;
2502 else if (rlen)
ec49126f 2503 tbl[i] = r[j-1];
79072805 2504 else
eb160463 2505 tbl[i] = (short)i;
79072805 2506 }
9b877dbb
IH		 2507 else {
2508 if (i < 128 && r[j] >= 128)
2509 grows = 1;
ec49126f 2510 tbl[i] = r[j++];
9b877dbb 2511 }
79072805
LW		 2512 }
2513 }
05d340b8
JH		 2514 if (!del) {
2515 if (!rlen) {
2516 j = rlen;
2517 if (!squash)
2518 o->op_private |= OPpTRANS_IDENTICAL;
2519 }
eb160463 2520 else if (j >= (I32)rlen)
05d340b8
JH		 2521 j = rlen - 1;
2522 else
2523 cPVOPo->op_pv = (char*)Renew(tbl, 0x101+rlen-j, short);
8973db79 2524 tbl[0x100] = rlen - j;
eb160463 2525 for (i=0; i < (I32)rlen - j; i++)
8973db79
JH		 2526 tbl[0x101+i] = r[j+i];
2527 }
79072805
LW		 2528 }
2529 else {
a0ed51b3 2530 if (!rlen && !del) {
79072805 2531 r = t; rlen = tlen;
5d06d08e 2532 if (!squash)
4757a243 2533 o->op_private |= OPpTRANS_IDENTICAL;
79072805 2534 }
94bfe852
RGS		 2535 else if (!squash && rlen == tlen && memEQ((char*)t, (char*)r, tlen)) {
2536 o->op_private |= OPpTRANS_IDENTICAL;
2537 }
79072805
LW		 2538 for (i = 0; i < 256; i++)
2539 tbl[i] = -1;
eb160463
GS		 2540 for (i = 0, j = 0; i < (I32)tlen; i++,j++) {
2541 if (j >= (I32)rlen) {
a0ed51b3 2542 if (del) {
ec49126f 2543 if (tbl[t[i]] == -1)
2544 tbl[t[i]] = -2;
79072805
LW		 2545 continue;
2546 }
2547 --j;
2548 }
9b877dbb
IH		 2549 if (tbl[t[i]] == -1) {
2550 if (t[i] < 128 && r[j] >= 128)
2551 grows = 1;
ec49126f 2552 tbl[t[i]] = r[j];
9b877dbb 2553 }
79072805
LW		 2554 }
2555 }
9b877dbb
IH		 2556 if (grows)
2557 o->op_private |= OPpTRANS_GROWS;
79072805
LW		 2558 op_free(expr);
2559 op_free(repl);
2560
11343788 2561 return o;
79072805
LW		 2562}
2563
2564OP *
864dbfa3 2565Perl_newPMOP(pTHX_ I32 type, I32 flags)
79072805
LW		 2566{
2567 PMOP *pmop;
2568
b7dc083c 2569 NewOp(1101, pmop, 1, PMOP);
eb160463 2570 pmop->op_type = (OPCODE)type;
22c35a8c 2571 pmop->op_ppaddr = PL_ppaddr[type];
eb160463
GS		 2572 pmop->op_flags = (U8)flags;
2573 pmop->op_private = (U8)(0 | (flags >> 8));
79072805 2574
3280af22 2575 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 2576 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 2577 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 2578 pmop->op_pmpermflags |= PMf_LOCALE;
2579 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2580
debc9467 2581#ifdef USE_ITHREADS
13137afc
AB		 2582 {
2583 SV* repointer;
2584 if(av_len((AV*) PL_regex_pad[0]) > -1) {
2585 repointer = av_pop((AV*)PL_regex_pad[0]);
2586 pmop->op_pmoffset = SvIV(repointer);
1cc8b4c5 2587 SvREPADTMP_off(repointer);
13137afc 2588 sv_setiv(repointer,0);
1eb1540c 2589 } else {
13137afc
AB		 2590 repointer = newSViv(0);
2591 av_push(PL_regex_padav,SvREFCNT_inc(repointer));
2592 pmop->op_pmoffset = av_len(PL_regex_padav);
2593 PL_regex_pad = AvARRAY(PL_regex_padav);
1fcf4c12 2594 }
13137afc 2595 }
debc9467 2596#endif
1eb1540c 2597
1fcf4c12 2598 /* link into pm list */
3280af22
NIS		 2599 if (type != OP_TRANS && PL_curstash) {
2600 pmop->op_pmnext = HvPMROOT(PL_curstash);
2601 HvPMROOT(PL_curstash) = pmop;
cb55de95 2602 PmopSTASH_set(pmop,PL_curstash);
79072805
LW		 2603 }
2604
463d09e6 2605 return CHECKOP(type, pmop);
79072805
LW		 2606}
2607
2608OP *
864dbfa3 2609Perl_pmruntime(pTHX_ OP *o, OP *expr, OP *repl)
79072805
LW		 2610{
2611 PMOP *pm;
2612 LOGOP *rcop;
ce862d02 2613 I32 repl_has_vars = 0;
79072805 2614
11343788
MB		 2615 if (o->op_type == OP_TRANS)
2616 return pmtrans(o, expr, repl);
79072805 2617
3280af22 2618 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2619 pm = (PMOP*)o;
79072805
LW		 2620
2621 if (expr->op_type == OP_CONST) {
463ee0b2 2622 STRLEN plen;
79072805 2623 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2624 char *p = SvPV(pat, plen);
11343788 2625 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2626 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2627 p = SvPV(pat, plen);
79072805
LW		 2628 pm->op_pmflags |= PMf_SKIPWHITE;
2629 }
5b71a6a7 2630 if (DO_UTF8(pat))
a5961de5 2631 pm->op_pmdynflags |= PMdf_UTF8;
aaa362c4
RS		 2632 PM_SETRE(pm, CALLREGCOMP(aTHX_ p, p + plen, pm));
2633 if (strEQ("\\s+", PM_GETRE(pm)->precomp))
85e6fe83 2634 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2635 op_free(expr);
2636 }
2637 else {
3280af22 2638 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
1c846c1f 2639 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2640 ? OP_REGCRESET
2641 : OP_REGCMAYBE),0,expr);
463ee0b2 2642
b7dc083c 2643 NewOp(1101, rcop, 1, LOGOP);
79072805 2644 rcop->op_type = OP_REGCOMP;
22c35a8c 2645 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 2646 rcop->op_first = scalar(expr);
1c846c1f 2647 rcop->op_flags |= ((PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2648 ? (OPf_SPECIAL | OPf_KIDS)
2649 : OPf_KIDS);
79072805 2650 rcop->op_private = 1;
11343788 2651 rcop->op_other = o;
b5c19bd7
DM		 2652 /* /$x/ may cause an eval, since $x might be qr/(?{..})/ */
2653 PL_cv_has_eval = 1;
79072805
LW		 2654
2655 /* establish postfix order */
3280af22 2656 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2657 LINKLIST(expr);
2658 rcop->op_next = expr;
2659 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2660 }
2661 else {
2662 rcop->op_next = LINKLIST(expr);
2663 expr->op_next = (OP*)rcop;
2664 }
79072805 2665
11343788 2666 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2667 }
2668
2669 if (repl) {
748a9306 2670 OP *curop;
0244c3a4 2671 if (pm->op_pmflags & PMf_EVAL) {
748a9306 2672 curop = 0;
8bafa735 2673 if (CopLINE(PL_curcop) < (line_t)PL_multi_end)
eb160463 2674 CopLINE_set(PL_curcop, (line_t)PL_multi_end);
0244c3a4 2675 }
748a9306
LW		 2676 else if (repl->op_type == OP_CONST)
2677 curop = repl;
79072805 2678 else {
79072805
LW		 2679 OP *lastop = 0;
2680 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 2681 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 2682 if (curop->op_type == OP_GV) {
638eceb6 2683 GV *gv = cGVOPx_gv(curop);
ce862d02 2684 repl_has_vars = 1;
f702bf4a 2685 if (strchr("&`'123456789+-\016\022", *GvENAME(gv)))
79072805
LW		 2686 break;
2687 }
2688 else if (curop->op_type == OP_RV2CV)
2689 break;
2690 else if (curop->op_type == OP_RV2SV ||
2691 curop->op_type == OP_RV2AV ||
2692 curop->op_type == OP_RV2HV ||
2693 curop->op_type == OP_RV2GV) {
2694 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2695 break;
2696 }
748a9306
LW		 2697 else if (curop->op_type == OP_PADSV ||
2698 curop->op_type == OP_PADAV ||
2699 curop->op_type == OP_PADHV ||
554b3eca 2700 curop->op_type == OP_PADANY) {
ce862d02 2701 repl_has_vars = 1;
748a9306 2702 }
1167e5da
SM		 2703 else if (curop->op_type == OP_PUSHRE)
2704 ; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 2705 else
2706 break;
2707 }
2708 lastop = curop;
2709 }
748a9306 2710 }
ce862d02 2711 if (curop == repl
1c846c1f 2712 && !(repl_has_vars
aaa362c4
RS		 2713 && (!PM_GETRE(pm)
2714 || PM_GETRE(pm)->reganch & ROPT_EVAL_SEEN))) {
748a9306 2715 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2716 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2717 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2718 }
2719 else {
aaa362c4 2720 if (curop == repl && !PM_GETRE(pm)) { /* Has variables. */
ce862d02
IZ		 2721 pm->op_pmflags |= PMf_MAYBE_CONST;
2722 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2723 }
b7dc083c 2724 NewOp(1101, rcop, 1, LOGOP);
748a9306 2725 rcop->op_type = OP_SUBSTCONT;
22c35a8c 2726 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 2727 rcop->op_first = scalar(repl);
2728 rcop->op_flags |= OPf_KIDS;
2729 rcop->op_private = 1;
11343788 2730 rcop->op_other = o;
748a9306
LW		 2731
2732 /* establish postfix order */
2733 rcop->op_next = LINKLIST(repl);
2734 repl->op_next = (OP*)rcop;
2735
2736 pm->op_pmreplroot = scalar((OP*)rcop);
2737 pm->op_pmreplstart = LINKLIST(rcop);
2738 rcop->op_next = 0;
79072805
LW		 2739 }
2740 }
2741
2742 return (OP*)pm;
2743}
2744
2745OP *
864dbfa3 2746Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv)
79072805
LW		 2747{
2748 SVOP *svop;
b7dc083c 2749 NewOp(1101, svop, 1, SVOP);
eb160463 2750 svop->op_type = (OPCODE)type;
22c35a8c 2751 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2752 svop->op_sv = sv;
2753 svop->op_next = (OP*)svop;
eb160463 2754 svop->op_flags = (U8)flags;
22c35a8c 2755 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2756 scalar((OP*)svop);
22c35a8c 2757 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2758 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2759 return CHECKOP(type, svop);
79072805
LW		 2760}
2761
2762OP *
350de78d
GS		 2763Perl_newPADOP(pTHX_ I32 type, I32 flags, SV *sv)
2764{
2765 PADOP *padop;
2766 NewOp(1101, padop, 1, PADOP);
eb160463 2767 padop->op_type = (OPCODE)type;
350de78d
GS		 2768 padop->op_ppaddr = PL_ppaddr[type];
2769 padop->op_padix = pad_alloc(type, SVs_PADTMP);
dd2155a4
DM		 2770 SvREFCNT_dec(PAD_SVl(padop->op_padix));
2771 PAD_SETSV(padop->op_padix, sv);
ce50c033
AMS		 2772 if (sv)
2773 SvPADTMP_on(sv);
350de78d 2774 padop->op_next = (OP*)padop;
eb160463 2775 padop->op_flags = (U8)flags;
350de78d
GS		 2776 if (PL_opargs[type] & OA_RETSCALAR)
2777 scalar((OP*)padop);
2778 if (PL_opargs[type] & OA_TARGET)
2779 padop->op_targ = pad_alloc(type, SVs_PADTMP);
2780 return CHECKOP(type, padop);
2781}
2782
2783OP *
864dbfa3 2784Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
79072805 2785{
350de78d 2786#ifdef USE_ITHREADS
ce50c033
AMS		 2787 if (gv)
2788 GvIN_PAD_on(gv);
350de78d
GS		 2789 return newPADOP(type, flags, SvREFCNT_inc(gv));
2790#else
7934575e 2791 return newSVOP(type, flags, SvREFCNT_inc(gv));
350de78d 2792#endif
79072805
LW		 2793}
2794
2795OP *
864dbfa3 2796Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv)
79072805
LW		 2797{
2798 PVOP *pvop;
b7dc083c 2799 NewOp(1101, pvop, 1, PVOP);
eb160463 2800 pvop->op_type = (OPCODE)type;
22c35a8c 2801 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2802 pvop->op_pv = pv;
2803 pvop->op_next = (OP*)pvop;
eb160463 2804 pvop->op_flags = (U8)flags;
22c35a8c 2805 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2806 scalar((OP*)pvop);
22c35a8c 2807 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2808 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2809 return CHECKOP(type, pvop);
79072805
LW		 2810}
2811
79072805 2812void
864dbfa3 2813Perl_package(pTHX_ OP *o)
79072805 2814{
de11ba31
AMS		 2815 char *name;
2816 STRLEN len;
79072805 2817
3280af22
NIS		 2818 save_hptr(&PL_curstash);
2819 save_item(PL_curstname);
de11ba31
AMS		 2820
2821 name = SvPV(cSVOPo->op_sv, len);
2822 PL_curstash = gv_stashpvn(name, len, TRUE);
2823 sv_setpvn(PL_curstname, name, len);
2824 op_free(o);
2825
7ad382f4 2826 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 2827 PL_copline = NOLINE;
2828 PL_expect = XSTATE;
79072805
LW		 2829}
2830
85e6fe83 2831void
88d95a4d 2832Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *idop, OP *arg)
85e6fe83 2833{
a0d0e21e 2834 OP *pack;
a0d0e21e 2835 OP *imop;
b1cb66bf 2836 OP *veop;
85e6fe83 2837
88d95a4d 2838 if (idop->op_type != OP_CONST)
cea2e8a9 2839 Perl_croak(aTHX_ "Module name must be constant");
85e6fe83 2840
b1cb66bf 2841 veop = Nullop;
2842
0f79a09d 2843 if (version != Nullop) {
b1cb66bf 2844 SV *vesv = ((SVOP*)version)->op_sv;
2845
44dcb63b 2846 if (arg == Nullop && !SvNIOKp(vesv)) {
b1cb66bf 2847 arg = version;
2848 }
2849 else {
2850 OP *pack;
0f79a09d 2851 SV *meth;
b1cb66bf 2852
44dcb63b 2853 if (version->op_type != OP_CONST || !SvNIOKp(vesv))
cea2e8a9 2854 Perl_croak(aTHX_ "Version number must be constant number");
b1cb66bf 2855
88d95a4d
JH		 2856 /* Make copy of idop so we don't free it twice */
2857 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
b1cb66bf 2858
2859 /* Fake up a method call to VERSION */
0f79a09d
GS		 2860 meth = newSVpvn("VERSION",7);
2861 sv_upgrade(meth, SVt_PVIV);
155aba94 2862 (void)SvIOK_on(meth);
5afd6d42 2863 PERL_HASH(SvUVX(meth), SvPVX(meth), SvCUR(meth));
b1cb66bf 2864 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2865 append_elem(OP_LIST,
0f79a09d
GS		 2866 prepend_elem(OP_LIST, pack, list(version)),
2867 newSVOP(OP_METHOD_NAMED, 0, meth)));
b1cb66bf 2868 }
2869 }
aeea060c 2870
a0d0e21e 2871 /* Fake up an import/unimport */
4633a7c4
LW		 2872 if (arg && arg->op_type == OP_STUB)
2873 imop = arg; /* no import on explicit () */
88d95a4d 2874 else if (SvNIOKp(((SVOP*)idop)->op_sv)) {
b1cb66bf 2875 imop = Nullop; /* use 5.0; */
2876 }
4633a7c4 2877 else {
0f79a09d
GS		 2878 SV *meth;
2879
88d95a4d
JH		 2880 /* Make copy of idop so we don't free it twice */
2881 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
0f79a09d
GS		 2882
2883 /* Fake up a method call to import/unimport */
b47cad08 2884 meth = aver ? newSVpvn("import",6) : newSVpvn("unimport", 8);
ad4c42df 2885 (void)SvUPGRADE(meth, SVt_PVIV);
155aba94 2886 (void)SvIOK_on(meth);
5afd6d42 2887 PERL_HASH(SvUVX(meth), SvPVX(meth), SvCUR(meth));
4633a7c4 2888 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
0f79a09d
GS		 2889 append_elem(OP_LIST,
2890 prepend_elem(OP_LIST, pack, list(arg)),
2891 newSVOP(OP_METHOD_NAMED, 0, meth)));
4633a7c4
LW		 2892 }
2893
a0d0e21e 2894 /* Fake up the BEGIN {}, which does its thing immediately. */
09bef843 2895 newATTRSUB(floor,
79cb57f6 2896 newSVOP(OP_CONST, 0, newSVpvn("BEGIN", 5)),
4633a7c4 2897 Nullop,
09bef843 2898 Nullop,
a0d0e21e 2899 append_elem(OP_LINESEQ,
b1cb66bf 2900 append_elem(OP_LINESEQ,
88d95a4d 2901 newSTATEOP(0, Nullch, newUNOP(OP_REQUIRE, 0, idop)),
b1cb66bf 2902 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2903 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2904
70f5e4ed
JH		 2905 /* The "did you use incorrect case?" warning used to be here.
2906 * The problem is that on case-insensitive filesystems one
2907 * might get false positives for "use" (and "require"):
2908 * "use Strict" or "require CARP" will work. This causes
2909 * portability problems for the script: in case-strict
2910 * filesystems the script will stop working.
2911 *
2912 * The "incorrect case" warning checked whether "use Foo"
2913 * imported "Foo" to your namespace, but that is wrong, too:
2914 * there is no requirement nor promise in the language that
2915 * a Foo.pm should or would contain anything in package "Foo".
2916 *
2917 * There is very little Configure-wise that can be done, either:
2918 * the case-sensitivity of the build filesystem of Perl does not
2919 * help in guessing the case-sensitivity of the runtime environment.
2920 */
18fc9488 2921
c305c6a0 2922 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 2923 PL_copline = NOLINE;
2924 PL_expect = XSTATE;
8ec8fbef 2925 PL_cop_seqmax++; /* Purely for B::*'s benefit */
85e6fe83
LW		 2926}
2927
7d3fb230 2928/*
ccfc67b7
JH		 2929=head1 Embedding Functions
2930
7d3fb230
BS		 2931=for apidoc load_module
2932
2933Loads the module whose name is pointed to by the string part of name.
2934Note that the actual module name, not its filename, should be given.
2935Eg, "Foo::Bar" instead of "Foo/Bar.pm". flags can be any of
2936PERL_LOADMOD_DENY, PERL_LOADMOD_NOIMPORT, or PERL_LOADMOD_IMPORT_OPS
2937(or 0 for no flags). ver, if specified, provides version semantics
2938similar to C<use Foo::Bar VERSION>. The optional trailing SV*
2939arguments can be used to specify arguments to the module's import()
2940method, similar to C<use Foo::Bar VERSION LIST>.
2941
2942=cut */
2943
e4783991
GS		 2944void
2945Perl_load_module(pTHX_ U32 flags, SV *name, SV *ver, ...)
2946{
2947 va_list args;
2948 va_start(args, ver);
2949 vload_module(flags, name, ver, &args);
2950 va_end(args);
2951}
2952
2953#ifdef PERL_IMPLICIT_CONTEXT
2954void
2955Perl_load_module_nocontext(U32 flags, SV *name, SV *ver, ...)
2956{
2957 dTHX;
2958 va_list args;
2959 va_start(args, ver);
2960 vload_module(flags, name, ver, &args);
2961 va_end(args);
2962}
2963#endif
2964
2965void
2966Perl_vload_module(pTHX_ U32 flags, SV *name, SV *ver, va_list *args)
2967{
2968 OP *modname, *veop, *imop;
2969
2970 modname = newSVOP(OP_CONST, 0, name);
2971 modname->op_private |= OPpCONST_BARE;
2972 if (ver) {
2973 veop = newSVOP(OP_CONST, 0, ver);
2974 }
2975 else
2976 veop = Nullop;
2977 if (flags & PERL_LOADMOD_NOIMPORT) {
2978 imop = sawparens(newNULLLIST());
2979 }
2980 else if (flags & PERL_LOADMOD_IMPORT_OPS) {
2981 imop = va_arg(*args, OP*);
2982 }
2983 else {
2984 SV *sv;
2985 imop = Nullop;
2986 sv = va_arg(*args, SV*);
2987 while (sv) {
2988 imop = append_elem(OP_LIST, imop, newSVOP(OP_CONST, 0, sv));
2989 sv = va_arg(*args, SV*);
2990 }
2991 }
81885997
GS		 2992 {
2993 line_t ocopline = PL_copline;
834a3ffa 2994 COP *ocurcop = PL_curcop;
81885997
GS		 2995 int oexpect = PL_expect;
2996
2997 utilize(!(flags & PERL_LOADMOD_DENY), start_subparse(FALSE, 0),
2998 veop, modname, imop);
2999 PL_expect = oexpect;
3000 PL_copline = ocopline;
834a3ffa 3001 PL_curcop = ocurcop;
81885997 3002 }
e4783991
GS		 3003}
3004
79072805 3005OP *
864dbfa3 3006Perl_dofile(pTHX_ OP *term)
78ca652e
GS		 3007{
3008 OP *doop;
3009 GV *gv;
3010
3011 gv = gv_fetchpv("do", FALSE, SVt_PVCV);
b9f751c0 3012 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv)))
78ca652e
GS		 3013 gv = gv_fetchpv("CORE::GLOBAL::do", FALSE, SVt_PVCV);
3014
b9f751c0 3015 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
78ca652e
GS		 3016 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
3017 append_elem(OP_LIST, term,
3018 scalar(newUNOP(OP_RV2CV, 0,
3019 newGVOP(OP_GV, 0,
3020 gv))))));
3021 }
3022 else {
3023 doop = newUNOP(OP_DOFILE, 0, scalar(term));
3024 }
3025 return doop;
3026}
3027
3028OP *
864dbfa3 3029Perl_newSLICEOP(pTHX_ I32 flags, OP *subscript, OP *listval)
79072805
LW		 3030{
3031 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 3032 list(force_list(subscript)),
3033 list(force_list(listval)) );
79072805
LW		 3034}
3035
76e3520e 3036STATIC I32
cea2e8a9 3037S_list_assignment(pTHX_ register OP *o)
79072805 3038{
11343788 3039 if (!o)
79072805
LW		 3040 return TRUE;
3041
11343788
MB		 3042 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
3043 o = cUNOPo->op_first;
79072805 3044
11343788 3045 if (o->op_type == OP_COND_EXPR) {
1a67a97c
SM		 3046 I32 t = list_assignment(cLOGOPo->op_first->op_sibling);
3047 I32 f = list_assignment(cLOGOPo->op_first->op_sibling->op_sibling);
79072805
LW		 3048
3049 if (t && f)
3050 return TRUE;
3051 if (t || f)
3052 yyerror("Assignment to both a list and a scalar");
3053 return FALSE;
3054 }
3055
95f0a2f1
SB		 3056 if (o->op_type == OP_LIST &&
3057 (o->op_flags & OPf_WANT) == OPf_WANT_SCALAR &&
3058 o->op_private & OPpLVAL_INTRO)
3059 return FALSE;
3060
11343788
MB		 3061 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
3062 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
3063 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 3064 return TRUE;
3065
11343788 3066 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 3067 return TRUE;
3068
11343788 3069 if (o->op_type == OP_RV2SV)
79072805
LW		 3070 return FALSE;
3071
3072 return FALSE;
3073}
3074
3075OP *
864dbfa3 3076Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
79072805 3077{
11343788 3078 OP *o;
79072805 3079
a0d0e21e 3080 if (optype) {
c963b151 3081 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN || optype == OP_DORASSIGN) {
a0d0e21e
LW		 3082 return newLOGOP(optype, 0,
3083 mod(scalar(left), optype),
3084 newUNOP(OP_SASSIGN, 0, scalar(right)));
3085 }
3086 else {
3087 return newBINOP(optype, OPf_STACKED,
3088 mod(scalar(left), optype), scalar(right));
3089 }
3090 }
3091
79072805 3092 if (list_assignment(left)) {
10c8fecd
GS		 3093 OP *curop;
3094
3280af22
NIS		 3095 PL_modcount = 0;
3096 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 3097 left = mod(left, OP_AASSIGN);
3280af22
NIS		 3098 if (PL_eval_start)
3099 PL_eval_start = 0;
748a9306 3100 else {
a0d0e21e
LW		 3101 op_free(left);
3102 op_free(right);
3103 return Nullop;
3104 }
10c8fecd
GS		 3105 curop = list(force_list(left));
3106 o = newBINOP(OP_AASSIGN, flags, list(force_list(right)), curop);
eb160463 3107 o->op_private = (U8)(0 | (flags >> 8));
dd2155a4
DM		 3108
3109 /* PL_generation sorcery:
3110 * an assignment like ($a,$b) = ($c,$d) is easier than
3111 * ($a,$b) = ($c,$a), since there is no need for temporary vars.
3112 * To detect whether there are common vars, the global var
3113 * PL_generation is incremented for each assign op we compile.
3114 * Then, while compiling the assign op, we run through all the
3115 * variables on both sides of the assignment, setting a spare slot
3116 * in each of them to PL_generation. If any of them already have
3117 * that value, we know we've got commonality. We could use a
3118 * single bit marker, but then we'd have to make 2 passes, first
3119 * to clear the flag, then to test and set it. To find somewhere
3120 * to store these values, evil chicanery is done with SvCUR().
3121 */
3122
a0d0e21e 3123 if (!(left->op_private & OPpLVAL_INTRO)) {
11343788 3124 OP *lastop = o;
3280af22 3125 PL_generation++;
11343788 3126 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 3127 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 3128 if (curop->op_type == OP_GV) {
638eceb6 3129 GV *gv = cGVOPx_gv(curop);
eb160463 3130 if (gv == PL_defgv || (int)SvCUR(gv) == PL_generation)
79072805 3131 break;
3280af22 3132 SvCUR(gv) = PL_generation;
79072805 3133 }
748a9306
LW		 3134 else if (curop->op_type == OP_PADSV ||
3135 curop->op_type == OP_PADAV ||
3136 curop->op_type == OP_PADHV ||
dd2155a4
DM		 3137 curop->op_type == OP_PADANY)
3138 {
3139 if (PAD_COMPNAME_GEN(curop->op_targ)
92251a1e 3140 == (STRLEN)PL_generation)
748a9306 3141 break;
dd2155a4
DM		 3142 PAD_COMPNAME_GEN(curop->op_targ)
3143 = PL_generation;
3144
748a9306 3145 }
79072805
LW		 3146 else if (curop->op_type == OP_RV2CV)
3147 break;
3148 else if (curop->op_type == OP_RV2SV ||
3149 curop->op_type == OP_RV2AV ||
3150 curop->op_type == OP_RV2HV ||
3151 curop->op_type == OP_RV2GV) {
3152 if (lastop->op_type != OP_GV) /* funny deref? */
3153 break;
3154 }
1167e5da
SM		 3155 else if (curop->op_type == OP_PUSHRE) {
3156 if (((PMOP*)curop)->op_pmreplroot) {
b3f5893f 3157#ifdef USE_ITHREADS
dd2155a4
DM		 3158 GV *gv = (GV*)PAD_SVl(INT2PTR(PADOFFSET,
3159 ((PMOP*)curop)->op_pmreplroot));
b3f5893f 3160#else
1167e5da 3161 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
b3f5893f 3162#endif
eb160463 3163 if (gv == PL_defgv || (int)SvCUR(gv) == PL_generation)
1167e5da 3164 break;
3280af22 3165 SvCUR(gv) = PL_generation;
b2ffa427 3166 }
1167e5da 3167 }
79072805
LW		 3168 else
3169 break;
3170 }
3171 lastop = curop;
3172 }
11343788 3173 if (curop != o)
10c8fecd 3174 o->op_private |= OPpASSIGN_COMMON;
79072805 3175 }
c07a80fd 3176 if (right && right->op_type == OP_SPLIT) {
3177 OP* tmpop;
3178 if ((tmpop = ((LISTOP*)right)->op_first) &&
3179 tmpop->op_type == OP_PUSHRE)
3180 {
3181 PMOP *pm = (PMOP*)tmpop;
3182 if (left->op_type == OP_RV2AV &&
3183 !(left->op_private & OPpLVAL_INTRO) &&
11343788 3184 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 3185 {
3186 tmpop = ((UNOP*)left)->op_first;
3187 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
971a9dd3 3188#ifdef USE_ITHREADS
ba89bb6e 3189 pm->op_pmreplroot = INT2PTR(OP*, cPADOPx(tmpop)->op_padix);
971a9dd3
GS		 3190 cPADOPx(tmpop)->op_padix = 0; /* steal it */
3191#else
3192 pm->op_pmreplroot = (OP*)cSVOPx(tmpop)->op_sv;
3193 cSVOPx(tmpop)->op_sv = Nullsv; /* steal it */
3194#endif
c07a80fd 3195 pm->op_pmflags |= PMf_ONCE;
11343788 3196 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 3197 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
3198 tmpop->op_sibling = Nullop; /* don't free split */
3199 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 3200 op_free(o); /* blow off assign */
54310121 3201 right->op_flags &= ~OPf_WANT;
a5f75d66 3202 /* "I don't know and I don't care." */
c07a80fd 3203 return right;
3204 }
3205 }
3206 else {
e6438c1a 3207 if (PL_modcount < RETURN_UNLIMITED_NUMBER &&
c07a80fd 3208 ((LISTOP*)right)->op_last->op_type == OP_CONST)
3209 {
3210 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
3211 if (SvIVX(sv) == 0)
3280af22 3212 sv_setiv(sv, PL_modcount+1);
c07a80fd 3213 }
3214 }
3215 }
3216 }
11343788 3217 return o;
79072805
LW		 3218 }
3219 if (!right)
3220 right = newOP(OP_UNDEF, 0);
3221 if (right->op_type == OP_READLINE) {
3222 right->op_flags |= OPf_STACKED;
463ee0b2 3223 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 3224 }
a0d0e21e 3225 else {
3280af22 3226 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 3227 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 3228 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 3229 if (PL_eval_start)
3230 PL_eval_start = 0;
748a9306 3231 else {
11343788 3232 op_free(o);
a0d0e21e
LW		 3233 return Nullop;
3234 }
3235 }
11343788 3236 return o;
79072805
LW		 3237}
3238
3239OP *
864dbfa3 3240Perl_newSTATEOP(pTHX_ I32 flags, char *label, OP *o)
79072805 3241{
bbce6d69 3242 U32 seq = intro_my();
79072805
LW		 3243 register COP *cop;
3244
b7dc083c 3245 NewOp(1101, cop, 1, COP);
57843af0 3246 if (PERLDB_LINE && CopLINE(PL_curcop) && PL_curstash != PL_debstash) {
8990e307 3247 cop->op_type = OP_DBSTATE;
22c35a8c 3248 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 3249 }
3250 else {
3251 cop->op_type = OP_NEXTSTATE;
22c35a8c 3252 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 3253 }
eb160463
GS		 3254 cop->op_flags = (U8)flags;
3255 cop->op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
ff0cee69 3256#ifdef NATIVE_HINTS
3257 cop->op_private |= NATIVE_HINTS;
3258#endif
e24b16f9 3259 PL_compiling.op_private = cop->op_private;
79072805
LW		 3260 cop->op_next = (OP*)cop;
3261
463ee0b2
LW		 3262 if (label) {
3263 cop->cop_label = label;
3280af22 3264 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 3265 }
bbce6d69 3266 cop->cop_seq = seq;
3280af22 3267 cop->cop_arybase = PL_curcop->cop_arybase;
0453d815 3268 if (specialWARN(PL_curcop->cop_warnings))
599cee73 3269 cop->cop_warnings = PL_curcop->cop_warnings ;
1c846c1f 3270 else
599cee73 3271 cop->cop_warnings = newSVsv(PL_curcop->cop_warnings) ;
ac27b0f5
NIS		 3272 if (specialCopIO(PL_curcop->cop_io))
3273 cop->cop_io = PL_curcop->cop_io;
3274 else
3275 cop->cop_io = newSVsv(PL_curcop->cop_io) ;
599cee73 3276
79072805 3277
3280af22 3278 if (PL_copline == NOLINE)
57843af0 3279 CopLINE_set(cop, CopLINE(PL_curcop));
79072805 3280 else {
57843af0 3281 CopLINE_set(cop, PL_copline);
3280af22 3282 PL_copline = NOLINE;
79072805 3283 }
57843af0 3284#ifdef USE_ITHREADS
f4dd75d9 3285 CopFILE_set(cop, CopFILE(PL_curcop)); /* XXX share in a pvtable? */
57843af0 3286#else
f4dd75d9 3287 CopFILEGV_set(cop, CopFILEGV(PL_curcop));
57843af0 3288#endif
11faa288 3289 CopSTASH_set(cop, PL_curstash);
79072805 3290
3280af22 3291 if (PERLDB_LINE && PL_curstash != PL_debstash) {
cc49e20b 3292 SV **svp = av_fetch(CopFILEAV(PL_curcop), (I32)CopLINE(cop), FALSE);
1eb1540c 3293 if (svp && *svp != &PL_sv_undef ) {
0ac0412a 3294 (void)SvIOK_on(*svp);
57b2e452 3295 SvIVX(*svp) = PTR2IV(cop);
1eb1540c 3296 }
93a17b20
LW		 3297 }
3298
11343788 3299 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3300}
3301
bbce6d69 3302
79072805 3303OP *
864dbfa3 3304Perl_newLOGOP(pTHX_ I32 type, I32 flags, OP *first, OP *other)
79072805 3305{
883ffac3
CS		 3306 return new_logop(type, flags, &first, &other);
3307}
3308
3bd495df 3309STATIC OP *
cea2e8a9 3310S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
883ffac3 3311{
79072805 3312 LOGOP *logop;
11343788 3313 OP *o;
883ffac3
CS		 3314 OP *first = *firstp;
3315 OP *other = *otherp;
79072805 3316
a0d0e21e
LW		 3317 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
3318 return newBINOP(type, flags, scalar(first), scalar(other));
3319
8990e307 3320 scalarboolean(first);
79072805
LW		 3321 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
3322 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
3323 if (type == OP_AND || type == OP_OR) {
3324 if (type == OP_AND)
3325 type = OP_OR;
3326 else
3327 type = OP_AND;
11343788 3328 o = first;
883ffac3 3329 first = *firstp = cUNOPo->op_first;
11343788
MB		 3330 if (o->op_next)
3331 first->op_next = o->op_next;
3332 cUNOPo->op_first = Nullop;
3333 op_free(o);
79072805
LW		 3334 }
3335 }
3336 if (first->op_type == OP_CONST) {
989dfb19 3337 if (ckWARN(WARN_BAREWORD) && (first->op_private & OPpCONST_BARE)) {
6d5637c3 3338 if (first->op_private & OPpCONST_STRICT)
989dfb19
K		 3339 no_bareword_allowed(first);
3340 else
3341 Perl_warner(aTHX_ packWARN(WARN_BAREWORD), "Bareword found in conditional");
3342 }
79072805
LW		 3343 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
3344 op_free(first);
883ffac3 3345 *firstp = Nullop;
79072805
LW		 3346 return other;
3347 }
3348 else {
3349 op_free(other);
883ffac3 3350 *otherp = Nullop;
79072805
LW		 3351 return first;
3352 }
3353 }
e476b1b5 3354 else if (ckWARN(WARN_MISC) && (first->op_flags & OPf_KIDS)) {
a6006777 3355 OP *k1 = ((UNOP*)first)->op_first;
3356 OP *k2 = k1->op_sibling;
3357 OPCODE warnop = 0;
3358 switch (first->op_type)
3359 {
3360 case OP_NULL:
3361 if (k2 && k2->op_type == OP_READLINE
3362 && (k2->op_flags & OPf_STACKED)
1c846c1f 3363 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
72b16652 3364 {
a6006777 3365 warnop = k2->op_type;
72b16652 3366 }
a6006777 3367 break;
3368
3369 case OP_SASSIGN:
68dc0745 3370 if (k1->op_type == OP_READDIR
3371 || k1->op_type == OP_GLOB
72b16652 3372 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
68dc0745 3373 || k1->op_type == OP_EACH)
72b16652
GS		 3374 {
3375 warnop = ((k1->op_type == OP_NULL)
eb160463 3376 ? (OPCODE)k1->op_targ : k1->op_type);
72b16652 3377 }
a6006777 3378 break;
3379 }
8ebc5c01 3380 if (warnop) {
57843af0
GS		 3381 line_t oldline = CopLINE(PL_curcop);
3382 CopLINE_set(PL_curcop, PL_copline);
9014280d 3383 Perl_warner(aTHX_ packWARN(WARN_MISC),
599cee73 3384 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 3385 PL_op_desc[warnop],
68dc0745 3386 ((warnop == OP_READLINE || warnop == OP_GLOB)
3387 ? " construct" : "() operator"));
57843af0 3388 CopLINE_set(PL_curcop, oldline);
8ebc5c01 3389 }
a6006777 3390 }
79072805
LW		 3391
3392 if (!other)
3393 return first;
3394
c963b151 3395 if (type == OP_ANDASSIGN || type == OP_ORASSIGN || type == OP_DORASSIGN)
a0d0e21e
LW		 3396 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
3397
b7dc083c 3398 NewOp(1101, logop, 1, LOGOP);
79072805 3399
eb160463 3400 logop->op_type = (OPCODE)type;
22c35a8c 3401 logop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3402 logop->op_first = first;
3403 logop->op_flags = flags | OPf_KIDS;
3404 logop->op_other = LINKLIST(other);
eb160463 3405 logop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 3406
3407 /* establish postfix order */
3408 logop->op_next = LINKLIST(first);
3409 first->op_next = (OP*)logop;
3410 first->op_sibling = other;
3411
463d09e6
RGS		 3412 CHECKOP(type,logop);
3413
11343788
MB		 3414 o = newUNOP(OP_NULL, 0, (OP*)logop);
3415 other->op_next = o;
79072805 3416
11343788 3417 return o;
79072805
LW		 3418}
3419
3420OP *
864dbfa3 3421Perl_newCONDOP(pTHX_ I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 3422{
1a67a97c
SM		 3423 LOGOP *logop;
3424 OP *start;
11343788 3425 OP *o;
79072805 3426
b1cb66bf 3427 if (!falseop)
3428 return newLOGOP(OP_AND, 0, first, trueop);
3429 if (!trueop)
3430 return newLOGOP(OP_OR, 0, first, falseop);
79072805 3431
8990e307 3432 scalarboolean(first);
79072805 3433 if (first->op_type == OP_CONST) {
2bc6235c
K		 3434 if (first->op_private & OPpCONST_BARE &&
3435 first->op_private & OPpCONST_STRICT) {
3436 no_bareword_allowed(first);
3437 }
79072805
LW		 3438 if (SvTRUE(((SVOP*)first)->op_sv)) {
3439 op_free(first);
b1cb66bf 3440 op_free(falseop);
3441 return trueop;
79072805
LW		 3442 }
3443 else {
3444 op_free(first);
b1cb66bf 3445 op_free(trueop);
3446 return falseop;
79072805
LW		 3447 }
3448 }
1a67a97c
SM		 3449 NewOp(1101, logop, 1, LOGOP);
3450 logop->op_type = OP_COND_EXPR;
3451 logop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
3452 logop->op_first = first;
3453 logop->op_flags = flags | OPf_KIDS;
eb160463 3454 logop->op_private = (U8)(1 | (flags >> 8));
1a67a97c
SM		 3455 logop->op_other = LINKLIST(trueop);
3456 logop->op_next = LINKLIST(falseop);
79072805 3457
463d09e6
RGS		 3458 CHECKOP(OP_COND_EXPR, /* that's logop->op_type */
3459 logop);
79072805
LW		 3460
3461 /* establish postfix order */
1a67a97c
SM		 3462 start = LINKLIST(first);
3463 first->op_next = (OP*)logop;
79072805 3464
b1cb66bf 3465 first->op_sibling = trueop;
3466 trueop->op_sibling = falseop;
1a67a97c 3467 o = newUNOP(OP_NULL, 0, (OP*)logop);
79072805 3468
1a67a97c 3469 trueop->op_next = falseop->op_next = o;
79072805 3470
1a67a97c 3471 o->op_next = start;
11343788 3472 return o;
79072805
LW		 3473}
3474
3475OP *
864dbfa3 3476Perl_newRANGE(pTHX_ I32 flags, OP *left, OP *right)
79072805 3477{
1a67a97c 3478 LOGOP *range;
79072805
LW		 3479 OP *flip;
3480 OP *flop;
1a67a97c 3481 OP *leftstart;
11343788 3482 OP *o;
79072805 3483
1a67a97c 3484 NewOp(1101, range, 1, LOGOP);
79072805 3485
1a67a97c
SM		 3486 range->op_type = OP_RANGE;
3487 range->op_ppaddr = PL_ppaddr[OP_RANGE];
3488 range->op_first = left;
3489 range->op_flags = OPf_KIDS;
3490 leftstart = LINKLIST(left);
3491 range->op_other = LINKLIST(right);
eb160463 3492 range->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 3493
3494 left->op_sibling = right;
3495
1a67a97c
SM		 3496 range->op_next = (OP*)range;
3497 flip = newUNOP(OP_FLIP, flags, (OP*)range);
79072805 3498 flop = newUNOP(OP_FLOP, 0, flip);
11343788 3499 o = newUNOP(OP_NULL, 0, flop);
79072805 3500 linklist(flop);
1a67a97c 3501 range->op_next = leftstart;
79072805
LW		 3502
3503 left->op_next = flip;
3504 right->op_next = flop;
3505
1a67a97c
SM		 3506 range->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
3507 sv_upgrade(PAD_SV(range->op_targ), SVt_PVNV);
ed6116ce 3508 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 3509 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
3510
3511 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3512 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3513
11343788 3514 flip->op_next = o;
79072805 3515 if (!flip->op_private || !flop->op_private)
11343788 3516 linklist(o); /* blow off optimizer unless constant */
79072805 3517
11343788 3518 return o;
79072805
LW		 3519}
3520
3521OP *
864dbfa3 3522Perl_newLOOPOP(pTHX_ I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 3523{
463ee0b2 3524 OP* listop;
11343788 3525 OP* o;
463ee0b2 3526 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 3527 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 3528
463ee0b2
LW		 3529 if (expr) {
3530 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
3531 return block; /* do {} while 0 does once */
fb73857a 3532 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3533 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 3534 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3535 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3536 } else if (expr->op_flags & OPf_KIDS) {
3537 OP *k1 = ((UNOP*)expr)->op_first;
3538 OP *k2 = (k1) ? k1->op_sibling : NULL;
3539 switch (expr->op_type) {
1c846c1f 3540 case OP_NULL:
55d729e4
GS		 3541 if (k2 && k2->op_type == OP_READLINE
3542 && (k2->op_flags & OPf_STACKED)
1c846c1f 3543 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
55d729e4 3544 expr = newUNOP(OP_DEFINED, 0, expr);
1c846c1f 3545 break;
55d729e4
GS		 3546
3547 case OP_SASSIGN:
3548 if (k1->op_type == OP_READDIR
3549 || k1->op_type == OP_GLOB
6531c3e6 3550 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
55d729e4
GS		 3551 || k1->op_type == OP_EACH)
3552 expr = newUNOP(OP_DEFINED, 0, expr);
3553 break;
3554 }
774d564b 3555 }
463ee0b2 3556 }
93a17b20 3557
8990e307 3558 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 3559 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 3560
883ffac3
CS		 3561 if (listop)
3562 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 3563
11343788
MB		 3564 if (once && o != listop)
3565 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 3566
11343788
MB		 3567 if (o == listop)
3568 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 3569
11343788
MB		 3570 o->op_flags |= flags;
3571 o = scope(o);
3572 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
3573 return o;
79072805
LW		 3574}
3575
3576OP *
864dbfa3 3577Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805
LW		 3578{
3579 OP *redo;
3580 OP *next = 0;
3581 OP *listop;
11343788 3582 OP *o;
1ba6ee2b 3583 U8 loopflags = 0;
79072805 3584
fb73857a 3585 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3586 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 3587 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3588 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3589 } else if (expr && (expr->op_flags & OPf_KIDS)) {
3590 OP *k1 = ((UNOP*)expr)->op_first;
3591 OP *k2 = (k1) ? k1->op_sibling : NULL;
3592 switch (expr->op_type) {
1c846c1f 3593 case OP_NULL:
55d729e4
GS		 3594 if (k2 && k2->op_type == OP_READLINE
3595 && (k2->op_flags & OPf_STACKED)
1c846c1f 3596 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
55d729e4 3597 expr = newUNOP(OP_DEFINED, 0, expr);
1c846c1f 3598 break;
55d729e4
GS		 3599
3600 case OP_SASSIGN:
3601 if (k1->op_type == OP_READDIR
3602 || k1->op_type == OP_GLOB
72b16652 3603 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
55d729e4
GS		 3604 || k1->op_type == OP_EACH)
3605 expr = newUNOP(OP_DEFINED, 0, expr);
3606 break;
3607 }
748a9306 3608 }
79072805
LW		 3609
3610 if (!block)
3611 block = newOP(OP_NULL, 0);
87246558
GS		 3612 else if (cont) {
3613 block = scope(block);
3614 }
79072805 3615
1ba6ee2b 3616 if (cont) {
79072805 3617 next = LINKLIST(cont);
1ba6ee2b 3618 }
fb73857a 3619 if (expr) {
85538317
GS		 3620 OP *unstack = newOP(OP_UNSTACK, 0);
3621 if (!next)
3622 next = unstack;
3623 cont = append_elem(OP_LINESEQ, cont, unstack);
fb73857a 3624 }
79072805 3625
463ee0b2 3626 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 3627 redo = LINKLIST(listop);
3628
3629 if (expr) {
eb160463 3630 PL_copline = (line_t)whileline;
883ffac3
CS		 3631 scalar(listop);
3632 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 3633 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 3634 op_free(expr); /* oops, it's a while (0) */
463ee0b2 3635 op_free((OP*)loop);
883ffac3 3636 return Nullop; /* listop already freed by new_logop */
463ee0b2 3637 }
883ffac3 3638 if (listop)
497b47a8 3639 ((LISTOP*)listop)->op_last->op_next =
883ffac3 3640 (o == listop ? redo : LINKLIST(o));
79072805
LW		 3641 }
3642 else
11343788 3643 o = listop;
79072805
LW		 3644
3645 if (!loop) {
b7dc083c 3646 NewOp(1101,loop,1,LOOP);
79072805 3647 loop->op_type = OP_ENTERLOOP;
22c35a8c 3648 loop->op_ppaddr = PL_ppaddr[OP_ENTERLOOP];
79072805
LW		 3649 loop->op_private = 0;
3650 loop->op_next = (OP*)loop;
3651 }
3652
11343788 3653 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 3654
3655 loop->op_redoop = redo;
11343788 3656 loop->op_lastop = o;
1ba6ee2b 3657 o->op_private |= loopflags;
79072805
LW		 3658
3659 if (next)
3660 loop->op_nextop = next;
3661 else
11343788 3662 loop->op_nextop = o;
79072805 3663
11343788
MB		 3664 o->op_flags |= flags;
3665 o->op_private |= (flags >> 8);
3666 return o;
79072805
LW		 3667}
3668
3669OP *
864dbfa3 3670Perl_newFOROP(pTHX_ I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
79072805
LW		 3671{
3672 LOOP *loop;
fb73857a 3673 OP *wop;
4bbc6d12 3674 PADOFFSET padoff = 0;
4633a7c4 3675 I32 iterflags = 0;
241416b8 3676 I32 iterpflags = 0;
79072805 3677
79072805 3678 if (sv) {
85e6fe83 3679 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
241416b8 3680 iterpflags = sv->op_private & OPpOUR_INTRO; /* for our $x () */
748a9306 3681 sv->op_type = OP_RV2GV;
22c35a8c 3682 sv->op_ppaddr = PL_ppaddr[OP_RV2GV];
79072805 3683 }
85e6fe83 3684 else if (sv->op_type == OP_PADSV) { /* private variable */
241416b8 3685 iterpflags = sv->op_private & OPpLVAL_INTRO; /* for my $x () */
85e6fe83 3686 padoff = sv->op_targ;
743e66e6 3687 sv->op_targ = 0;
85e6fe83
LW		 3688 op_free(sv);
3689 sv = Nullop;
3690 }
54b9620d
MB		 3691 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
3692 padoff = sv->op_targ;
743e66e6 3693 sv->op_targ = 0;
54b9620d
MB		 3694 iterflags |= OPf_SPECIAL;
3695 op_free(sv);
3696 sv = Nullop;
3697 }
79072805 3698 else
cea2e8a9 3699 Perl_croak(aTHX_ "Can't use %s for loop variable", PL_op_desc[sv->op_type]);
79072805
LW		 3700 }
3701 else {
3280af22 3702 sv = newGVOP(OP_GV, 0, PL_defgv);
79072805 3703 }
5f05dabc 3704 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 3705 expr = mod(force_list(scalar(ref(expr, OP_ITER))), OP_GREPSTART);
4633a7c4
LW		 3706 iterflags |= OPf_STACKED;
3707 }
89ea2908
GA		 3708 else if (expr->op_type == OP_NULL &&
3709 (expr->op_flags & OPf_KIDS) &&
3710 ((BINOP*)expr)->op_first->op_type == OP_FLOP)
3711 {
3712 /* Basically turn for($x..$y) into the same as for($x,$y), but we
3713 * set the STACKED flag to indicate that these values are to be
3714 * treated as min/max values by 'pp_iterinit'.
3715 */
3716 UNOP* flip = (UNOP*)((UNOP*)((BINOP*)expr)->op_first)->op_first;
1a67a97c 3717 LOGOP* range = (LOGOP*) flip->op_first;
89ea2908
GA		 3718 OP* left = range->op_first;
3719 OP* right = left->op_sibling;
5152d7c7 3720 LISTOP* listop;
89ea2908
GA		 3721
3722 range->op_flags &= ~OPf_KIDS;
3723 range->op_first = Nullop;
3724
5152d7c7 3725 listop = (LISTOP*)newLISTOP(OP_LIST, 0, left, right);
1a67a97c
SM		 3726 listop->op_first->op_next = range->op_next;
3727 left->op_next = range->op_other;
5152d7c7
GS		 3728 right->op_next = (OP*)listop;
3729 listop->op_next = listop->op_first;
89ea2908
GA		 3730
3731 op_free(expr);
5152d7c7 3732 expr = (OP*)(listop);
93c66552 3733 op_null(expr);
89ea2908
GA		 3734 iterflags |= OPf_STACKED;
3735 }
3736 else {
3737 expr = mod(force_list(expr), OP_GREPSTART);
3738 }
3739
3740
4633a7c4 3741 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
89ea2908 3742 append_elem(OP_LIST, expr, scalar(sv))));
85e6fe83 3743 assert(!loop->op_next);
241416b8 3744 /* for my $x () sets OPpLVAL_INTRO;
14f338dc 3745 * for our $x () sets OPpOUR_INTRO */
c5661c80 3746 loop->op_private = (U8)iterpflags;
b7dc083c 3747#ifdef PL_OP_SLAB_ALLOC
155aba94
GS		 3748 {
3749 LOOP *tmp;
3750 NewOp(1234,tmp,1,LOOP);
3751 Copy(loop,tmp,1,LOOP);
238a4c30 3752 FreeOp(loop);
155aba94
GS		 3753 loop = tmp;
3754 }
b7dc083c 3755#else
85e6fe83 3756 Renew(loop, 1, LOOP);
1c846c1f 3757#endif
85e6fe83 3758 loop->op_targ = padoff;
fb73857a 3759 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont);
3280af22 3760 PL_copline = forline;
fb73857a 3761 return newSTATEOP(0, label, wop);
79072805
LW		 3762}
3763
8990e307 3764OP*
864dbfa3 3765Perl_newLOOPEX(pTHX_ I32 type, OP *label)
8990e307 3766{
11343788 3767 OP *o;
2d8e6c8d
GS		 3768 STRLEN n_a;
3769
8990e307 3770 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 3771 /* "last()" means "last" */
3772 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
3773 o = newOP(type, OPf_SPECIAL);
3774 else {
3775 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
2d8e6c8d 3776 ? SvPVx(((SVOP*)label)->op_sv, n_a)
cdaebead
MB		 3777 : ""));
3778 }
8990e307
LW		 3779 op_free(label);
3780 }
3781 else {
a0d0e21e
LW		 3782 if (label->op_type == OP_ENTERSUB)
3783 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 3784 o = newUNOP(type, OPf_STACKED, label);
8990e307 3785 }
3280af22 3786 PL_hints |= HINT_BLOCK_SCOPE;
11343788 3787 return o;
8990e307
LW		 3788}
3789
7dafbf52
DM		 3790/*
3791=for apidoc cv_undef
3792
3793Clear out all the active components of a CV. This can happen either
3794by an explicit C<undef &foo>, or by the reference count going to zero.
3795In the former case, we keep the CvOUTSIDE pointer, so that any anonymous
3796children can still follow the full lexical scope chain.
3797
3798=cut
3799*/
3800
79072805 3801void
864dbfa3 3802Perl_cv_undef(pTHX_ CV *cv)
79072805 3803{
a636914a 3804#ifdef USE_ITHREADS
35f1c1c7
SB		 3805 if (CvFILE(cv) && !CvXSUB(cv)) {
3806 /* for XSUBs CvFILE point directly to static memory; __FILE__ */
a636914a 3807 Safefree(CvFILE(cv));
a636914a 3808 }
f3e31eb5 3809 CvFILE(cv) = 0;
a636914a
RH		 3810#endif
3811
a0d0e21e
LW		 3812 if (!CvXSUB(cv) && CvROOT(cv)) {
3813 if (CvDEPTH(cv))
cea2e8a9 3814 Perl_croak(aTHX_ "Can't undef active subroutine");
8990e307 3815 ENTER;
a0d0e21e 3816
f3548bdc 3817 PAD_SAVE_SETNULLPAD();
a0d0e21e 3818
282f25c9 3819 op_free(CvROOT(cv));
79072805 3820 CvROOT(cv) = Nullop;
8990e307 3821 LEAVE;
79072805 3822 }
1d5db326 3823 SvPOK_off((SV*)cv); /* forget prototype */
8e07c86e 3824 CvGV(cv) = Nullgv;
a3985cdc
DM		 3825
3826 pad_undef(cv);
3827
7dafbf52
DM		 3828 /* remove CvOUTSIDE unless this is an undef rather than a free */
3829 if (!SvREFCNT(cv) && CvOUTSIDE(cv)) {
3830 if (!CvWEAKOUTSIDE(cv))
3831 SvREFCNT_dec(CvOUTSIDE(cv));
3832 CvOUTSIDE(cv) = Nullcv;
3833 }
beab0874
JT		 3834 if (CvCONST(cv)) {
3835 SvREFCNT_dec((SV*)CvXSUBANY(cv).any_ptr);
3836 CvCONST_off(cv);
3837 }
50762d59
DM		 3838 if (CvXSUB(cv)) {
3839 CvXSUB(cv) = 0;
3840 }
7dafbf52
DM		 3841 /* delete all flags except WEAKOUTSIDE */
3842 CvFLAGS(cv) &= CVf_WEAKOUTSIDE;
79072805
LW		 3843}
3844
3fe9a6f1 3845void
864dbfa3 3846Perl_cv_ckproto(pTHX_ CV *cv, GV *gv, char *p)
3fe9a6f1 3847{
e476b1b5 3848 if (((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX(cv)))) && ckWARN_d(WARN_PROTOTYPE)) {
46fc3d4c 3849 SV* msg = sv_newmortal();
3fe9a6f1 3850 SV* name = Nullsv;
3851
3852 if (gv)
46fc3d4c 3853 gv_efullname3(name = sv_newmortal(), gv, Nullch);
3854 sv_setpv(msg, "Prototype mismatch:");
3855 if (name)
894356b3 3856 Perl_sv_catpvf(aTHX_ msg, " sub %"SVf, name);
3fe9a6f1 3857 if (SvPOK(cv))
35c1215d 3858 Perl_sv_catpvf(aTHX_ msg, " (%"SVf")", (SV *)cv);
46fc3d4c 3859 sv_catpv(msg, " vs ");
3860 if (p)
cea2e8a9 3861 Perl_sv_catpvf(aTHX_ msg, "(%s)", p);
46fc3d4c 3862 else
3863 sv_catpv(msg, "none");
9014280d 3864 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "%"SVf, msg);
3fe9a6f1 3865 }
3866}
3867
35f1c1c7
SB		 3868static void const_sv_xsub(pTHX_ CV* cv);
3869
beab0874 3870/*
ccfc67b7
JH		 3871
3872=head1 Optree Manipulation Functions
3873
beab0874
JT		 3874=for apidoc cv_const_sv
3875
3876If C<cv> is a constant sub eligible for inlining. returns the constant
3877value returned by the sub. Otherwise, returns NULL.
3878
3879Constant subs can be created with C<newCONSTSUB> or as described in
3880L<perlsub/"Constant Functions">.
3881
3882=cut
3883*/
760ac839 3884SV *
864dbfa3 3885Perl_cv_const_sv(pTHX_ CV *cv)
760ac839 3886{
beab0874 3887 if (!cv || !CvCONST(cv))
54310121 3888 return Nullsv;
beab0874 3889 return (SV*)CvXSUBANY(cv).any_ptr;
fe5e78ed 3890}
760ac839 3891
b5c19bd7
DM		 3892/* op_const_sv: examine an optree to determine whether it's in-lineable.
3893 * Can be called in 3 ways:
3894 *
3895 * !cv
3896 * look for a single OP_CONST with attached value: return the value
3897 *
3898 * cv && CvCLONE(cv) && !CvCONST(cv)
3899 *
3900 * examine the clone prototype, and if contains only a single
3901 * OP_CONST referencing a pad const, or a single PADSV referencing
3902 * an outer lexical, return a non-zero value to indicate the CV is
3903 * a candidate for "constizing" at clone time
3904 *
3905 * cv && CvCONST(cv)
3906 *
3907 * We have just cloned an anon prototype that was marked as a const
3908 * candidiate. Try to grab the current value, and in the case of
3909 * PADSV, ignore it if it has multiple references. Return the value.
3910 */
3911
fe5e78ed 3912SV *
864dbfa3 3913Perl_op_const_sv(pTHX_ OP *o, CV *cv)
fe5e78ed
GS		 3914{
3915 SV *sv = Nullsv;
3916
0f79a09d 3917 if (!o)
fe5e78ed 3918 return Nullsv;
1c846c1f
NIS		 3919
3920 if (o->op_type == OP_LINESEQ && cLISTOPo->op_first)
fe5e78ed
GS		 3921 o = cLISTOPo->op_first->op_sibling;
3922
3923 for (; o; o = o->op_next) {
54310121 3924 OPCODE type = o->op_type;
fe5e78ed 3925
1c846c1f 3926 if (sv && o->op_next == o)
fe5e78ed 3927 return sv;
e576b457
JT		 3928 if (o->op_next != o) {
3929 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
3930 continue;
3931 if (type == OP_DBSTATE)
3932 continue;
3933 }
54310121 3934 if (type == OP_LEAVESUB || type == OP_RETURN)
3935 break;
3936 if (sv)
3937 return Nullsv;
7766f137 3938 if (type == OP_CONST && cSVOPo->op_sv)
5dc0d613 3939 sv = cSVOPo->op_sv;
b5c19bd7 3940 else if (cv && type == OP_CONST) {
dd2155a4 3941 sv = PAD_BASE_SV(CvPADLIST(cv), o->op_targ);
beab0874
JT		 3942 if (!sv)
3943 return Nullsv;
b5c19bd7
DM		 3944 }
3945 else if (cv && type == OP_PADSV) {
3946 if (CvCONST(cv)) { /* newly cloned anon */
3947 sv = PAD_BASE_SV(CvPADLIST(cv), o->op_targ);
3948 /* the candidate should have 1 ref from this pad and 1 ref
3949 * from the parent */
3950 if (!sv || SvREFCNT(sv) != 2)
3951 return Nullsv;
beab0874 3952 sv = newSVsv(sv);
b5c19bd7
DM		 3953 SvREADONLY_on(sv);
3954 return sv;
3955 }
3956 else {
3957 if (PAD_COMPNAME_FLAGS(o->op_targ) & SVf_FAKE)
3958 sv = &PL_sv_undef; /* an arbitrary non-null value */
beab0874 3959 }
760ac839 3960 }
b5c19bd7 3961 else {
54310121 3962 return Nullsv;
b5c19bd7 3963 }
760ac839
LW		 3964 }
3965 return sv;
3966}
3967
09bef843
SB		 3968void
3969Perl_newMYSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
3970{
3971 if (o)
3972 SAVEFREEOP(o);
3973 if (proto)
3974 SAVEFREEOP(proto);
3975 if (attrs)
3976 SAVEFREEOP(attrs);
3977 if (block)
3978 SAVEFREEOP(block);
3979 Perl_croak(aTHX_ "\"my sub\" not yet implemented");
3980}
3981
748a9306 3982CV *
864dbfa3 3983Perl_newSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *block)
79072805 3984{
09bef843
SB		 3985 return Perl_newATTRSUB(aTHX_ floor, o, proto, Nullop, block);
3986}
3987
3988CV *
3989Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
3990{
2d8e6c8d 3991 STRLEN n_a;
83ee9e09
GS		 3992 char *name;
3993 char *aname;
3994 GV *gv;
2d8e6c8d 3995 char *ps = proto ? SvPVx(((SVOP*)proto)->op_sv, n_a) : Nullch;
a2008d6d 3996 register CV *cv=0;
beab0874 3997 SV *const_sv;
79072805 3998
83ee9e09
GS		 3999 name = o ? SvPVx(cSVOPo->op_sv, n_a) : Nullch;
4000 if (!name && PERLDB_NAMEANON && CopLINE(PL_curcop)) {
4001 SV *sv = sv_newmortal();
c99da370
JH		 4002 Perl_sv_setpvf(aTHX_ sv, "%s[%s:%"IVdf"]",
4003 PL_curstash ? "__ANON__" : "__ANON__::__ANON__",
83ee9e09
GS		 4004 CopFILE(PL_curcop), (IV)CopLINE(PL_curcop));
4005 aname = SvPVX(sv);
4006 }
4007 else
4008 aname = Nullch;
c99da370
JH		 4009 gv = gv_fetchpv(name ? name : (aname ? aname :
4010 (PL_curstash ? "__ANON__" : "__ANON__::__ANON__")),
83ee9e09
GS		 4011 GV_ADDMULTI | ((block || attrs) ? 0 : GV_NOINIT),
4012 SVt_PVCV);
4013
11343788 4014 if (o)
5dc0d613 4015 SAVEFREEOP(o);
3fe9a6f1 4016 if (proto)
4017 SAVEFREEOP(proto);
09bef843
SB		 4018 if (attrs)
4019 SAVEFREEOP(attrs);
3fe9a6f1 4020
09bef843 4021 if (SvTYPE(gv) != SVt_PVGV) { /* Maybe prototype now, and had at
55d729e4
GS		 4022 maximum a prototype before. */
4023 if (SvTYPE(gv) > SVt_NULL) {
0453d815 4024 if (!SvPOK((SV*)gv) && !(SvIOK((SV*)gv) && SvIVX((SV*)gv) == -1)
e476b1b5 4025 && ckWARN_d(WARN_PROTOTYPE))
f248d071 4026 {
9014280d 4027 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "Runaway prototype");
f248d071 4028 }
55d729e4
GS		 4029 cv_ckproto((CV*)gv, NULL, ps);
4030 }
4031 if (ps)
4032 sv_setpv((SV*)gv, ps);
4033 else
4034 sv_setiv((SV*)gv, -1);
3280af22
NIS		 4035 SvREFCNT_dec(PL_compcv);
4036 cv = PL_compcv = NULL;
4037 PL_sub_generation++;
beab0874 4038 goto done;
55d729e4
GS		 4039 }
4040
beab0874
JT		 4041 cv = (!name || GvCVGEN(gv)) ? Nullcv : GvCV(gv);
4042
7fb37951
AMS		 4043#ifdef GV_UNIQUE_CHECK
4044 if (cv && GvUNIQUE(gv) && SvREADONLY(cv)) {
4045 Perl_croak(aTHX_ "Can't define subroutine %s (GV is unique)", name);
5bd07a3d
DM		 4046 }
4047#endif
4048
beab0874
JT		 4049 if (!block || !ps || *ps || attrs)
4050 const_sv = Nullsv;
4051 else
4052 const_sv = op_const_sv(block, Nullcv);
4053
4054 if (cv) {
60ed1d8c 4055 bool exists = CvROOT(cv) || CvXSUB(cv);
5bd07a3d 4056
7fb37951
AMS		 4057#ifdef GV_UNIQUE_CHECK
4058 if (exists && GvUNIQUE(gv)) {
4059 Perl_croak(aTHX_ "Can't redefine unique subroutine %s", name);
5bd07a3d
DM		 4060 }
4061#endif
4062
60ed1d8c
GS		 4063 /* if the subroutine doesn't exist and wasn't pre-declared
4064 * with a prototype, assume it will be AUTOLOADed,
4065 * skipping the prototype check
4066 */
4067 if (exists || SvPOK(cv))
01ec43d0 4068 cv_ckproto(cv, gv, ps);
68dc0745 4069 /* already defined (or promised)? */
60ed1d8c 4070 if (exists || GvASSUMECV(gv)) {
09bef843 4071 if (!block && !attrs) {
d3cea301
SB		 4072 if (CvFLAGS(PL_compcv)) {
4073 /* might have had built-in attrs applied */
4074 CvFLAGS(cv) |= (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS);
4075 }
aa689395 4076 /* just a "sub foo;" when &foo is already defined */
3280af22 4077 SAVEFREESV(PL_compcv);
aa689395 4078 goto done;
4079 }
7bac28a0 4080 /* ahem, death to those who redefine active sort subs */
3280af22 4081 if (PL_curstackinfo->si_type == PERLSI_SORT && PL_sortcop == CvSTART(cv))
cea2e8a9 4082 Perl_croak(aTHX_ "Can't redefine active sort subroutine %s", name);
beab0874
JT		 4083 if (block) {
4084 if (ckWARN(WARN_REDEFINE)
4085 || (CvCONST(cv)
4086 && (!const_sv || sv_cmp(cv_const_sv(cv), const_sv))))
4087 {
4088 line_t oldline = CopLINE(PL_curcop);
d8a34499
IK		 4089 if (PL_copline != NOLINE)
4090 CopLINE_set(PL_curcop, PL_copline);
9014280d 4091 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
beab0874
JT		 4092 CvCONST(cv) ? "Constant subroutine %s redefined"
4093 : "Subroutine %s redefined", name);
4094 CopLINE_set(PL_curcop, oldline);
4095 }
4096 SvREFCNT_dec(cv);
4097 cv = Nullcv;
79072805 4098 }
79072805
LW		 4099 }
4100 }
beab0874
JT		 4101 if (const_sv) {
4102 SvREFCNT_inc(const_sv);
4103 if (cv) {
0768512c 4104 assert(!CvROOT(cv) && !CvCONST(cv));
beab0874
JT		 4105 sv_setpv((SV*)cv, ""); /* prototype is "" */
4106 CvXSUBANY(cv).any_ptr = const_sv;
4107 CvXSUB(cv) = const_sv_xsub;
4108 CvCONST_on(cv);
beab0874
JT		 4109 }
4110 else {
4111 GvCV(gv) = Nullcv;
4112 cv = newCONSTSUB(NULL, name, const_sv);
4113 }
4114 op_free(block);
4115 SvREFCNT_dec(PL_compcv);
4116 PL_compcv = NULL;
4117 PL_sub_generation++;
4118 goto done;
4119 }
09bef843
SB		 4120 if (attrs) {
4121 HV *stash;
4122 SV *rcv;
4123
4124 /* Need to do a C<use attributes $stash_of_cv,\&cv,@attrs>
4125 * before we clobber PL_compcv.
4126 */
4127 if (cv && !block) {
4128 rcv = (SV*)cv;
020f0e03
SB		 4129 /* Might have had built-in attributes applied -- propagate them. */
4130 CvFLAGS(cv) |= (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS);
a9164de8 4131 if (CvGV(cv) && GvSTASH(CvGV(cv)))
09bef843 4132 stash = GvSTASH(CvGV(cv));
a9164de8 4133 else if (CvSTASH(cv))
09bef843
SB		 4134 stash = CvSTASH(cv);
4135 else
4136 stash = PL_curstash;
4137 }
4138 else {
4139 /* possibly about to re-define existing subr -- ignore old cv */
4140 rcv = (SV*)PL_compcv;
a9164de8 4141 if (name && GvSTASH(gv))
09bef843
SB		 4142 stash = GvSTASH(gv);
4143 else
4144 stash = PL_curstash;
4145 }
95f0a2f1 4146 apply_attrs(stash, rcv, attrs, FALSE);
09bef843 4147 }
a0d0e21e 4148 if (cv) { /* must reuse cv if autoloaded */
09bef843
SB		 4149 if (!block) {
4150 /* got here with just attrs -- work done, so bug out */
4151 SAVEFREESV(PL_compcv);
4152 goto done;
4153 }
a3985cdc 4154 /* transfer PL_compcv to cv */
4633a7c4 4155 cv_undef(cv);
3280af22
NIS		 4156 CvFLAGS(cv) = CvFLAGS(PL_compcv);
4157 CvOUTSIDE(cv) = CvOUTSIDE(PL_compcv);
a3985cdc 4158 CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(PL_compcv);
3280af22
NIS		 4159 CvOUTSIDE(PL_compcv) = 0;
4160 CvPADLIST(cv) = CvPADLIST(PL_compcv);
4161 CvPADLIST(PL_compcv) = 0;
282f25c9 4162 /* inner references to PL_compcv must be fixed up ... */
dd2155a4 4163 pad_fixup_inner_anons(CvPADLIST(cv), PL_compcv, cv);
282f25c9 4164 /* ... before we throw it away */
3280af22 4165 SvREFCNT_dec(PL_compcv);
b5c19bd7 4166 PL_compcv = cv;
a933f601
IZ		 4167 if (PERLDB_INTER)/* Advice debugger on the new sub. */
4168 ++PL_sub_generation;
a0d0e21e
LW		 4169 }
4170 else {
3280af22 4171 cv = PL_compcv;
44a8e56a 4172 if (name) {
4173 GvCV(gv) = cv;
4174 GvCVGEN(gv) = 0;
3280af22 4175 PL_sub_generation++;
44a8e56a 4176 }
a0d0e21e 4177 }
65c50114 4178 CvGV(cv) = gv;
a636914a 4179 CvFILE_set_from_cop(cv, PL_curcop);
3280af22 4180 CvSTASH(cv) = PL_curstash;
8990e307 4181
3fe9a6f1 4182 if (ps)
4183 sv_setpv((SV*)cv, ps);
4633a7c4 4184
3280af22 4185 if (PL_error_count) {
c07a80fd 4186 op_free(block);
4187 block = Nullop;
68dc0745 4188 if (name) {
4189 char *s = strrchr(name, ':');
4190 s = s ? s+1 : name;
6d4c2119
CS		 4191 if (strEQ(s, "BEGIN")) {
4192 char *not_safe =
4193 "BEGIN not safe after errors--compilation aborted";
faef0170 4194 if (PL_in_eval & EVAL_KEEPERR)
cea2e8a9 4195 Perl_croak(aTHX_ not_safe);
6d4c2119
CS		 4196 else {
4197 /* force display of errors found but not reported */
38a03e6e 4198 sv_catpv(ERRSV, not_safe);
35c1215d 4199 Perl_croak(aTHX_ "%"SVf, ERRSV);
6d4c2119
CS		 4200 }
4201 }
68dc0745 4202 }
c07a80fd 4203 }
beab0874
JT		 4204 if (!block)
4205 goto done;
a0d0e21e 4206
7766f137 4207 if (CvLVALUE(cv)) {
78f9721b
SM		 4208 CvROOT(cv) = newUNOP(OP_LEAVESUBLV, 0,
4209 mod(scalarseq(block), OP_LEAVESUBLV));
7766f137
GS		 4210 }
4211 else {
4212 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
4213 }
4214 CvROOT(cv)->op_private |= OPpREFCOUNTED;
4215 OpREFCNT_set(CvROOT(cv), 1);
4216 CvSTART(cv) = LINKLIST(CvROOT(cv));
4217 CvROOT(cv)->op_next = 0;
a2efc822 4218 CALL_PEEP(CvSTART(cv));
7766f137
GS		 4219
4220 /* now that optimizer has done its work, adjust pad values */
54310121 4221
dd2155a4
DM		 4222 pad_tidy(CvCLONE(cv) ? padtidy_SUBCLONE : padtidy_SUB);
4223
4224 if (CvCLONE(cv)) {
beab0874
JT		 4225 assert(!CvCONST(cv));
4226 if (ps && !*ps && op_const_sv(block, cv))
4227 CvCONST_on(cv);
a0d0e21e 4228 }
79072805 4229
83ee9e09 4230 if (name || aname) {
44a8e56a 4231 char *s;
83ee9e09 4232 char *tname = (name ? name : aname);
44a8e56a 4233
3280af22 4234 if (PERLDB_SUBLINE && PL_curstash != PL_debstash) {
46fc3d4c 4235 SV *sv = NEWSV(0,0);
44a8e56a 4236 SV *tmpstr = sv_newmortal();
549bb64a 4237 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
83ee9e09 4238 CV *pcv;
44a8e56a 4239 HV *hv;
4240
ed094faf
GS		 4241 Perl_sv_setpvf(aTHX_ sv, "%s:%ld-%ld",
4242 CopFILE(PL_curcop),
cc49e20b 4243 (long)PL_subline, (long)CopLINE(PL_curcop));
44a8e56a 4244 gv_efullname3(tmpstr, gv, Nullch);
3280af22 4245 hv_store(GvHV(PL_DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 4246 hv = GvHVn(db_postponed);
9607fc9c 4247 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX(tmpstr), SvCUR(tmpstr))
83ee9e09
GS		 4248 && (pcv = GvCV(db_postponed)))
4249 {
44a8e56a 4250 dSP;
924508f0 4251 PUSHMARK(SP);
44a8e56a 4252 XPUSHs(tmpstr);
4253 PUTBACK;
83ee9e09 4254 call_sv((SV*)pcv, G_DISCARD);
44a8e56a 4255 }
4256 }
79072805 4257
83ee9e09 4258 if ((s = strrchr(tname,':')))
28757baa 4259 s++;
4260 else
83ee9e09 4261 s = tname;
ed094faf 4262
7d30b5c4 4263 if (*s != 'B' && *s != 'E' && *s != 'C' && *s != 'I')
ed094faf
GS		 4264 goto done;
4265
7678c486 4266 if (strEQ(s, "BEGIN") && !PL_error_count) {
3280af22 4267 I32 oldscope = PL_scopestack_ix;
28757baa 4268 ENTER;
57843af0
GS		 4269 SAVECOPFILE(&PL_compiling);
4270 SAVECOPLINE(&PL_compiling);
28757baa 4271
3280af22
NIS		 4272 if (!PL_beginav)
4273 PL_beginav = newAV();
28757baa 4274 DEBUG_x( dump_sub(gv) );
ea2f84a3
GS		 4275 av_push(PL_beginav, (SV*)cv);
4276 GvCV(gv) = 0; /* cv has been hijacked */
3280af22 4277 call_list(oldscope, PL_beginav);
a6006777 4278
3280af22 4279 PL_curcop = &PL_compiling;
eb160463 4280 PL_compiling.op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
28757baa 4281 LEAVE;
4282 }
3280af22
NIS		 4283 else if (strEQ(s, "END") && !PL_error_count) {
4284 if (!PL_endav)
4285 PL_endav = newAV();
ed094faf 4286 DEBUG_x( dump_sub(gv) );
3280af22 4287 av_unshift(PL_endav, 1);
ea2f84a3
GS		 4288 av_store(PL_endav, 0, (SV*)cv);
4289 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 4290 }
7d30b5c4
GS		 4291 else if (strEQ(s, "CHECK") && !PL_error_count) {
4292 if (!PL_checkav)
4293 PL_checkav = newAV();
ed094faf 4294 DEBUG_x( dump_sub(gv) );
ddda08b7 4295 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4296 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run CHECK block");
7d30b5c4 4297 av_unshift(PL_checkav, 1);
ea2f84a3
GS		 4298 av_store(PL_checkav, 0, (SV*)cv);
4299 GvCV(gv) = 0; /* cv has been hijacked */
4f25aa18 4300 }
3280af22
NIS		 4301 else if (strEQ(s, "INIT") && !PL_error_count) {
4302 if (!PL_initav)
4303 PL_initav = newAV();
ed094faf 4304 DEBUG_x( dump_sub(gv) );
ddda08b7 4305 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4306 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run INIT block");
ea2f84a3
GS		 4307 av_push(PL_initav, (SV*)cv);
4308 GvCV(gv) = 0; /* cv has been hijacked */
ae77835f 4309 }
79072805 4310 }
a6006777 4311
aa689395 4312 done:
3280af22 4313 PL_copline = NOLINE;
8990e307 4314 LEAVE_SCOPE(floor);
a0d0e21e 4315 return cv;
79072805
LW		 4316}
4317
b099ddc0 4318/* XXX unsafe for threads if eval_owner isn't held */
954c1994
GS		 4319/*
4320=for apidoc newCONSTSUB
4321
4322Creates a constant sub equivalent to Perl C<sub FOO () { 123 }> which is
4323eligible for inlining at compile-time.
4324
4325=cut
4326*/
4327
beab0874 4328CV *
864dbfa3 4329Perl_newCONSTSUB(pTHX_ HV *stash, char *name, SV *sv)
5476c433 4330{
beab0874 4331 CV* cv;
5476c433 4332
11faa288 4333 ENTER;
11faa288 4334
f4dd75d9 4335 SAVECOPLINE(PL_curcop);
11faa288 4336 CopLINE_set(PL_curcop, PL_copline);
f4dd75d9
GS		 4337
4338 SAVEHINTS();
3280af22 4339 PL_hints &= ~HINT_BLOCK_SCOPE;
11faa288
GS		 4340
4341 if (stash) {
4342 SAVESPTR(PL_curstash);
4343 SAVECOPSTASH(PL_curcop);
4344 PL_curstash = stash;
05ec9bb3 4345 CopSTASH_set(PL_curcop,stash);
11faa288 4346 }
5476c433 4347
91a15d0d 4348 cv = newXS(name, const_sv_xsub, savepv(CopFILE(PL_curcop)));
beab0874
JT		 4349 CvXSUBANY(cv).any_ptr = sv;
4350 CvCONST_on(cv);
4351 sv_setpv((SV*)cv, ""); /* prototype is "" */
5476c433 4352
02f28d44
MHM		 4353 if (stash)
4354 CopSTASH_free(PL_curcop);
4355
11faa288 4356 LEAVE;
beab0874
JT		 4357
4358 return cv;
5476c433
JD		 4359}
4360
954c1994
GS		 4361/*
4362=for apidoc U||newXS
4363
4364Used by C<xsubpp> to hook up XSUBs as Perl subs.
4365
4366=cut
4367*/
4368
57d3b86d 4369CV *
864dbfa3 4370Perl_newXS(pTHX_ char *name, XSUBADDR_t subaddr, char *filename)
a0d0e21e 4371{
c99da370
JH		 4372 GV *gv = gv_fetchpv(name ? name :
4373 (PL_curstash ? "__ANON__" : "__ANON__::__ANON__"),
4374 GV_ADDMULTI, SVt_PVCV);
79072805 4375 register CV *cv;
44a8e56a 4376
1ecdd9a8
HS		 4377 if (!subaddr)
4378 Perl_croak(aTHX_ "panic: no address for '%s' in '%s'", name, filename);
4379
155aba94 4380 if ((cv = (name ? GvCV(gv) : Nullcv))) {
44a8e56a 4381 if (GvCVGEN(gv)) {
4382 /* just a cached method */
4383 SvREFCNT_dec(cv);
4384 cv = 0;
4385 }
4386 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
4387 /* already defined (or promised) */
599cee73 4388 if (ckWARN(WARN_REDEFINE) && !(CvGV(cv) && GvSTASH(CvGV(cv))
2f34f9d4 4389 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "autouse"))) {
57843af0 4390 line_t oldline = CopLINE(PL_curcop);
51f6edd3 4391 if (PL_copline != NOLINE)
57843af0 4392 CopLINE_set(PL_curcop, PL_copline);
9014280d 4393 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
beab0874
JT		 4394 CvCONST(cv) ? "Constant subroutine %s redefined"
4395 : "Subroutine %s redefined"
4396 ,name);
57843af0 4397 CopLINE_set(PL_curcop, oldline);
a0d0e21e
LW		 4398 }
4399 SvREFCNT_dec(cv);
4400 cv = 0;
79072805 4401 }
79072805 4402 }
44a8e56a 4403
4404 if (cv) /* must reuse cv if autoloaded */
4405 cv_undef(cv);
a0d0e21e
LW		 4406 else {
4407 cv = (CV*)NEWSV(1105,0);
4408 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 4409 if (name) {
4410 GvCV(gv) = cv;
4411 GvCVGEN(gv) = 0;
3280af22 4412 PL_sub_generation++;
44a8e56a 4413 }
a0d0e21e 4414 }
65c50114 4415 CvGV(cv) = gv;
b195d487 4416 (void)gv_fetchfile(filename);
57843af0
GS		 4417 CvFILE(cv) = filename; /* NOTE: not copied, as it is expected to be
4418 an external constant string */
a0d0e21e 4419 CvXSUB(cv) = subaddr;
44a8e56a 4420
28757baa 4421 if (name) {
4422 char *s = strrchr(name,':');
4423 if (s)
4424 s++;
4425 else
4426 s = name;
ed094faf 4427
7d30b5c4 4428 if (*s != 'B' && *s != 'E' && *s != 'C' && *s != 'I')
ed094faf
GS		 4429 goto done;
4430
28757baa 4431 if (strEQ(s, "BEGIN")) {
3280af22
NIS		 4432 if (!PL_beginav)
4433 PL_beginav = newAV();
ea2f84a3
GS		 4434 av_push(PL_beginav, (SV*)cv);
4435 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 4436 }
4437 else if (strEQ(s, "END")) {
3280af22
NIS		 4438 if (!PL_endav)
4439 PL_endav = newAV();
4440 av_unshift(PL_endav, 1);
ea2f84a3
GS		 4441 av_store(PL_endav, 0, (SV*)cv);
4442 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 4443 }
7d30b5c4
GS		 4444 else if (strEQ(s, "CHECK")) {
4445 if (!PL_checkav)
4446 PL_checkav = newAV();
ddda08b7 4447 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4448 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run CHECK block");
7d30b5c4 4449 av_unshift(PL_checkav, 1);
ea2f84a3
GS		 4450 av_store(PL_checkav, 0, (SV*)cv);
4451 GvCV(gv) = 0; /* cv has been hijacked */
4f25aa18 4452 }
7d07dbc2 4453 else if (strEQ(s, "INIT")) {
3280af22
NIS		 4454 if (!PL_initav)
4455 PL_initav = newAV();
ddda08b7 4456 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4457 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run INIT block");
ea2f84a3
GS		 4458 av_push(PL_initav, (SV*)cv);
4459 GvCV(gv) = 0; /* cv has been hijacked */
ae77835f 4460 }
28757baa 4461 }
8990e307 4462 else
a5f75d66 4463 CvANON_on(cv);
44a8e56a 4464
ed094faf 4465done:
a0d0e21e 4466 return cv;
79072805
LW		 4467}
4468
4469void
864dbfa3 4470Perl_newFORM(pTHX_ I32 floor, OP *o, OP *block)
79072805
LW		 4471{
4472 register CV *cv;
4473 char *name;
4474 GV *gv;
2d8e6c8d 4475 STRLEN n_a;
79072805 4476
11343788 4477 if (o)
2d8e6c8d 4478 name = SvPVx(cSVOPo->op_sv, n_a);
79072805
LW		 4479 else
4480 name = "STDOUT";
85e6fe83 4481 gv = gv_fetchpv(name,TRUE, SVt_PVFM);
7fb37951
AMS		 4482#ifdef GV_UNIQUE_CHECK
4483 if (GvUNIQUE(gv)) {
4484 Perl_croak(aTHX_ "Bad symbol for form (GV is unique)");
5bd07a3d
DM		 4485 }
4486#endif
a5f75d66 4487 GvMULTI_on(gv);
155aba94 4488 if ((cv = GvFORM(gv))) {
599cee73 4489 if (ckWARN(WARN_REDEFINE)) {
57843af0 4490 line_t oldline = CopLINE(PL_curcop);
d8a34499
IK		 4491 if (PL_copline != NOLINE)
4492 CopLINE_set(PL_curcop, PL_copline);
9014280d 4493 Perl_warner(aTHX_ packWARN(WARN_REDEFINE), "Format %s redefined",name);
57843af0 4494 CopLINE_set(PL_curcop, oldline);
79072805 4495 }
8990e307 4496 SvREFCNT_dec(cv);
79072805 4497 }
3280af22 4498 cv = PL_compcv;
79072805 4499 GvFORM(gv) = cv;
65c50114 4500 CvGV(cv) = gv;
a636914a 4501 CvFILE_set_from_cop(cv, PL_curcop);
79072805 4502
a0d0e21e 4503
dd2155a4 4504 pad_tidy(padtidy_FORMAT);
79072805 4505 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
7934575e
GS		 4506 CvROOT(cv)->op_private |= OPpREFCOUNTED;
4507 OpREFCNT_set(CvROOT(cv), 1);
79072805
LW		 4508 CvSTART(cv) = LINKLIST(CvROOT(cv));
4509 CvROOT(cv)->op_next = 0;
a2efc822 4510 CALL_PEEP(CvSTART(cv));
11343788 4511 op_free(o);
3280af22 4512 PL_copline = NOLINE;
8990e307 4513 LEAVE_SCOPE(floor);
79072805
LW		 4514}
4515
4516OP *
864dbfa3 4517Perl_newANONLIST(pTHX_ OP *o)
79072805 4518{
93a17b20 4519 return newUNOP(OP_REFGEN, 0,
11343788 4520 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 4521}
4522
4523OP *
864dbfa3 4524Perl_newANONHASH(pTHX_ OP *o)
79072805 4525{
93a17b20 4526 return newUNOP(OP_REFGEN, 0,
11343788 4527 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 4528}
4529
4530OP *
864dbfa3 4531Perl_newANONSUB(pTHX_ I32 floor, OP *proto, OP *block)
a0d0e21e 4532{
09bef843
SB		 4533 return newANONATTRSUB(floor, proto, Nullop, block);
4534}
4535
4536OP *
4537Perl_newANONATTRSUB(pTHX_ I32 floor, OP *proto, OP *attrs, OP *block)
4538{
a0d0e21e 4539 return newUNOP(OP_REFGEN, 0,
09bef843
SB		 4540 newSVOP(OP_ANONCODE, 0,
4541 (SV*)newATTRSUB(floor, 0, proto, attrs, block)));
79072805
LW		 4542}
4543
4544OP *
864dbfa3 4545Perl_oopsAV(pTHX_ OP *o)
79072805 4546{
ed6116ce
LW		 4547 switch (o->op_type) {
4548 case OP_PADSV:
4549 o->op_type = OP_PADAV;
22c35a8c 4550 o->op_ppaddr = PL_ppaddr[OP_PADAV];
51e247a3 4551 return ref(o, OP_RV2AV);
b2ffa427 4552
ed6116ce 4553 case OP_RV2SV:
79072805 4554 o->op_type = OP_RV2AV;
22c35a8c 4555 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 4556 ref(o, OP_RV2AV);
ed6116ce
LW		 4557 break;
4558
4559 default:
0453d815 4560 if (ckWARN_d(WARN_INTERNAL))
9014280d 4561 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "oops: oopsAV");
ed6116ce
LW		 4562 break;
4563 }
79072805
LW		 4564 return o;
4565}
4566
4567OP *
864dbfa3 4568Perl_oopsHV(pTHX_ OP *o)
79072805 4569{
ed6116ce
LW		 4570 switch (o->op_type) {
4571 case OP_PADSV:
4572 case OP_PADAV:
4573 o->op_type = OP_PADHV;
22c35a8c 4574 o->op_ppaddr = PL_ppaddr[OP_PADHV];
51e247a3 4575 return ref(o, OP_RV2HV);
ed6116ce
LW		 4576
4577 case OP_RV2SV:
4578 case OP_RV2AV:
79072805 4579 o->op_type = OP_RV2HV;
22c35a8c 4580 o->op_ppaddr = PL_ppaddr[OP_RV2HV];
79072805 4581 ref(o, OP_RV2HV);
ed6116ce
LW		 4582 break;
4583
4584 default:
0453d815 4585 if (ckWARN_d(WARN_INTERNAL))
9014280d 4586 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "oops: oopsHV");
ed6116ce
LW		 4587 break;
4588 }
79072805
LW		 4589 return o;
4590}
4591
4592OP *
864dbfa3 4593Perl_newAVREF(pTHX_ OP *o)
79072805 4594{
ed6116ce
LW		 4595 if (o->op_type == OP_PADANY) {
4596 o->op_type = OP_PADAV;
22c35a8c 4597 o->op_ppaddr = PL_ppaddr[OP_PADAV];
93a17b20 4598 return o;
ed6116ce 4599 }
a1063b2d 4600 else if ((o->op_type == OP_RV2AV || o->op_type == OP_PADAV)
9014280d
PM		 4601 && ckWARN(WARN_DEPRECATED)) {
4602 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
a1063b2d
RH		 4603 "Using an array as a reference is deprecated");
4604 }
79072805
LW		 4605 return newUNOP(OP_RV2AV, 0, scalar(o));
4606}
4607
4608OP *
864dbfa3 4609Perl_newGVREF(pTHX_ I32 type, OP *o)
79072805 4610{
82092f1d 4611 if (type == OP_MAPSTART || type == OP_GREPSTART || type == OP_SORT)
a0d0e21e 4612 return newUNOP(OP_NULL, 0, o);
748a9306 4613 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 4614}
4615
4616OP *
864dbfa3 4617Perl_newHVREF(pTHX_ OP *o)
79072805 4618{
ed6116ce
LW		 4619 if (o->op_type == OP_PADANY) {
4620 o->op_type = OP_PADHV;
22c35a8c 4621 o->op_ppaddr = PL_ppaddr[OP_PADHV];
93a17b20 4622 return o;
ed6116ce 4623 }
a1063b2d 4624 else if ((o->op_type == OP_RV2HV || o->op_type == OP_PADHV)
9014280d
PM		 4625 && ckWARN(WARN_DEPRECATED)) {
4626 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
a1063b2d
RH		 4627 "Using a hash as a reference is deprecated");
4628 }
79072805
LW		 4629 return newUNOP(OP_RV2HV, 0, scalar(o));
4630}
4631
4632OP *
864dbfa3 4633Perl_oopsCV(pTHX_ OP *o)
79072805 4634{
cea2e8a9 4635 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805
LW		 4636 /* STUB */
4637 return o;
4638}
4639
4640OP *
864dbfa3 4641Perl_newCVREF(pTHX_ I32 flags, OP *o)
79072805 4642{
c07a80fd 4643 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 4644}
4645
4646OP *
864dbfa3 4647Perl_newSVREF(pTHX_ OP *o)
79072805 4648{
ed6116ce
LW		 4649 if (o->op_type == OP_PADANY) {
4650 o->op_type = OP_PADSV;
22c35a8c 4651 o->op_ppaddr = PL_ppaddr[OP_PADSV];
93a17b20 4652 return o;
ed6116ce 4653 }
224a4551
MB		 4654 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
4655 o->op_flags |= OPpDONE_SVREF;
a863c7d1 4656 return o;
224a4551 4657 }
79072805
LW		 4658 return newUNOP(OP_RV2SV, 0, scalar(o));
4659}
4660
4661/* Check routines. */
4662
4663OP *
cea2e8a9 4664Perl_ck_anoncode(pTHX_ OP *o)
5f05dabc 4665{
dd2155a4 4666 cSVOPo->op_targ = pad_add_anon(cSVOPo->op_sv, o->op_type);
5dc0d613 4667 cSVOPo->op_sv = Nullsv;
5dc0d613 4668 return o;
5f05dabc 4669}
4670
4671OP *
cea2e8a9 4672Perl_ck_bitop(pTHX_ OP *o)
55497cff 4673{
276b2a0c
RGS		 4674#define OP_IS_NUMCOMPARE(op) \
4675 ((op) == OP_LT || (op) == OP_I_LT || \
4676 (op) == OP_GT || (op) == OP_I_GT || \
4677 (op) == OP_LE || (op) == OP_I_LE || \
4678 (op) == OP_GE || (op) == OP_I_GE || \
4679 (op) == OP_EQ || (op) == OP_I_EQ || \
4680 (op) == OP_NE || (op) == OP_I_NE || \
4681 (op) == OP_NCMP || (op) == OP_I_NCMP)
eb160463 4682 o->op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
2b84528b
RGS		 4683 if (!(o->op_flags & OPf_STACKED) /* Not an assignment */
4684 && (o->op_type == OP_BIT_OR
4685 || o->op_type == OP_BIT_AND
4686 || o->op_type == OP_BIT_XOR))
276b2a0c 4687 {
96a925ab
YST		 4688 OP * left = cBINOPo->op_first;
4689 OP * right = left->op_sibling;
4690 if ((OP_IS_NUMCOMPARE(left->op_type) &&
4691 (left->op_flags & OPf_PARENS) == 0) ||
4692 (OP_IS_NUMCOMPARE(right->op_type) &&
4693 (right->op_flags & OPf_PARENS) == 0))
276b2a0c
RGS		 4694 if (ckWARN(WARN_PRECEDENCE))
4695 Perl_warner(aTHX_ packWARN(WARN_PRECEDENCE),
4696 "Possible precedence problem on bitwise %c operator",
4697 o->op_type == OP_BIT_OR ? '|'
4698 : o->op_type == OP_BIT_AND ? '&' : '^'
4699 );
4700 }
5dc0d613 4701 return o;
55497cff 4702}
4703
4704OP *
cea2e8a9 4705Perl_ck_concat(pTHX_ OP *o)
79072805 4706{
0165acc7
AE		 4707 OP *kid = cUNOPo->op_first;
4708 if (kid->op_type == OP_CONCAT && !(kUNOP->op_first->op_flags & OPf_MOD))
4709 o->op_flags |= OPf_STACKED;
11343788 4710 return o;
79072805
LW		 4711}
4712
4713OP *
cea2e8a9 4714Perl_ck_spair(pTHX_ OP *o)
79072805 4715{
11343788 4716 if (o->op_flags & OPf_KIDS) {
79072805 4717 OP* newop;
a0d0e21e 4718 OP* kid;
5dc0d613
MB		 4719 OPCODE type = o->op_type;
4720 o = modkids(ck_fun(o), type);
11343788 4721 kid = cUNOPo->op_first;
a0d0e21e
LW		 4722 newop = kUNOP->op_first->op_sibling;
4723 if (newop &&
4724 (newop->op_sibling ||
22c35a8c 4725 !(PL_opargs[newop->op_type] & OA_RETSCALAR) ||
a0d0e21e
LW		 4726 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
4727 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
b2ffa427 4728
11343788 4729 return o;
a0d0e21e
LW		 4730 }
4731 op_free(kUNOP->op_first);
4732 kUNOP->op_first = newop;
4733 }
22c35a8c 4734 o->op_ppaddr = PL_ppaddr[++o->op_type];
11343788 4735 return ck_fun(o);
a0d0e21e
LW		 4736}
4737
4738OP *
cea2e8a9 4739Perl_ck_delete(pTHX_ OP *o)
a0d0e21e 4740{
11343788 4741 o = ck_fun(o);
5dc0d613 4742 o->op_private = 0;
11343788
MB		 4743 if (o->op_flags & OPf_KIDS) {
4744 OP *kid = cUNOPo->op_first;
01020589
GS		 4745 switch (kid->op_type) {
4746 case OP_ASLICE:
4747 o->op_flags |= OPf_SPECIAL;
4748 /* FALL THROUGH */
4749 case OP_HSLICE:
5dc0d613 4750 o->op_private |= OPpSLICE;
01020589
GS		 4751 break;
4752 case OP_AELEM:
4753 o->op_flags |= OPf_SPECIAL;
4754 /* FALL THROUGH */
4755 case OP_HELEM:
4756 break;
4757 default:
4758 Perl_croak(aTHX_ "%s argument is not a HASH or ARRAY element or slice",
53e06cf0 4759 OP_DESC(o));
01020589 4760 }
93c66552 4761 op_null(kid);
79072805 4762 }
11343788 4763 return o;
79072805
LW		 4764}
4765
4766OP *
96e176bf
CL		 4767Perl_ck_die(pTHX_ OP *o)
4768{
4769#ifdef VMS
4770 if (VMSISH_HUSHED) o->op_private |= OPpHUSH_VMSISH;
4771#endif
4772 return ck_fun(o);
4773}
4774
4775OP *
cea2e8a9 4776Perl_ck_eof(pTHX_ OP *o)
79072805 4777{
11343788 4778 I32 type = o->op_type;
79072805 4779
11343788
MB		 4780 if (o->op_flags & OPf_KIDS) {
4781 if (cLISTOPo->op_first->op_type == OP_STUB) {
4782 op_free(o);
8fde6460 4783 o = newUNOP(type, OPf_SPECIAL, newGVOP(OP_GV, 0, PL_argvgv));
8990e307 4784 }
11343788 4785 return ck_fun(o);
79072805 4786 }
11343788 4787 return o;
79072805
LW		 4788}
4789
4790OP *
cea2e8a9 4791Perl_ck_eval(pTHX_ OP *o)
79072805 4792{
3280af22 4793 PL_hints |= HINT_BLOCK_SCOPE;
11343788
MB		 4794 if (o->op_flags & OPf_KIDS) {
4795 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 4796
93a17b20 4797 if (!kid) {
11343788 4798 o->op_flags &= ~OPf_KIDS;
93c66552 4799 op_null(o);
79072805 4800 }
b14574b4 4801 else if (kid->op_type == OP_LINESEQ || kid->op_type == OP_STUB) {
79072805
LW		 4802 LOGOP *enter;
4803
11343788
MB		 4804 cUNOPo->op_first = 0;
4805 op_free(o);
79072805 4806
b7dc083c 4807 NewOp(1101, enter, 1, LOGOP);
79072805 4808 enter->op_type = OP_ENTERTRY;
22c35a8c 4809 enter->op_ppaddr = PL_ppaddr[OP_ENTERTRY];
79072805
LW		 4810 enter->op_private = 0;
4811
4812 /* establish postfix order */
4813 enter->op_next = (OP*)enter;
4814
11343788
MB		 4815 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
4816 o->op_type = OP_LEAVETRY;
22c35a8c 4817 o->op_ppaddr = PL_ppaddr[OP_LEAVETRY];
11343788
MB		 4818 enter->op_other = o;
4819 return o;
79072805 4820 }
b5c19bd7 4821 else {
473986ff 4822 scalar((OP*)kid);
b5c19bd7
DM		 4823 PL_cv_has_eval = 1;
4824 }
79072805
LW		 4825 }
4826 else {
11343788 4827 op_free(o);
54b9620d 4828 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
79072805 4829 }
3280af22 4830 o->op_targ = (PADOFFSET)PL_hints;
11343788 4831 return o;
79072805
LW		 4832}
4833
4834OP *
d98f61e7
GS		 4835Perl_ck_exit(pTHX_ OP *o)
4836{
4837#ifdef VMS
4838 HV *table = GvHV(PL_hintgv);
4839 if (table) {
4840 SV **svp = hv_fetch(table, "vmsish_exit", 11, FALSE);
4841 if (svp && *svp && SvTRUE(*svp))
4842 o->op_private |= OPpEXIT_VMSISH;
4843 }
96e176bf 4844 if (VMSISH_HUSHED) o->op_private |= OPpHUSH_VMSISH;
d98f61e7
GS		 4845#endif
4846 return ck_fun(o);
4847}
4848
4849OP *
cea2e8a9 4850Perl_ck_exec(pTHX_ OP *o)
79072805
LW		 4851{
4852 OP *kid;
11343788
MB		 4853 if (o->op_flags & OPf_STACKED) {
4854 o = ck_fun(o);
4855 kid = cUNOPo->op_first->op_sibling;
8990e307 4856 if (kid->op_type == OP_RV2GV)
93c66552 4857 op_null(kid);
79072805 4858 }
463ee0b2 4859 else
11343788
MB		 4860 o = listkids(o);
4861 return o;
79072805
LW		 4862}
4863
4864OP *
cea2e8a9 4865Perl_ck_exists(pTHX_ OP *o)
5f05dabc 4866{
5196be3e
MB		 4867 o = ck_fun(o);
4868 if (o->op_flags & OPf_KIDS) {
4869 OP *kid = cUNOPo->op_first;
afebc493
GS		 4870 if (kid->op_type == OP_ENTERSUB) {
4871 (void) ref(kid, o->op_type);
4872 if (kid->op_type != OP_RV2CV && !PL_error_count)
4873 Perl_croak(aTHX_ "%s argument is not a subroutine name",
53e06cf0 4874 OP_DESC(o));
afebc493
GS		 4875 o->op_private |= OPpEXISTS_SUB;
4876 }
4877 else if (kid->op_type == OP_AELEM)
01020589
GS		 4878 o->op_flags |= OPf_SPECIAL;
4879 else if (kid->op_type != OP_HELEM)
4880 Perl_croak(aTHX_ "%s argument is not a HASH or ARRAY element",
53e06cf0 4881 OP_DESC(o));
93c66552 4882 op_null(kid);
5f05dabc 4883 }
5196be3e 4884 return o;
5f05dabc 4885}
4886
22c35a8c 4887#if 0
5f05dabc 4888OP *
cea2e8a9 4889Perl_ck_gvconst(pTHX_ register OP *o)
79072805
LW		 4890{
4891 o = fold_constants(o);
4892 if (o->op_type == OP_CONST)
4893 o->op_type = OP_GV;
4894 return o;
4895}
22c35a8c 4896#endif
79072805
LW		 4897
4898OP *
cea2e8a9 4899Perl_ck_rvconst(pTHX_ register OP *o)
79072805 4900{
11343788 4901 SVOP *kid = (SVOP*)cUNOPo->op_first;
85e6fe83 4902
3280af22 4903 o->op_private |= (PL_hints & HINT_STRICT_REFS);
79072805 4904 if (kid->op_type == OP_CONST) {
44a8e56a 4905 char *name;
4906 int iscv;
4907 GV *gv;
779c5bc9 4908 SV *kidsv = kid->op_sv;
2d8e6c8d 4909 STRLEN n_a;
44a8e56a 4910
779c5bc9
GS		 4911 /* Is it a constant from cv_const_sv()? */
4912 if (SvROK(kidsv) && SvREADONLY(kidsv)) {
4913 SV *rsv = SvRV(kidsv);
4914 int svtype = SvTYPE(rsv);
4915 char *badtype = Nullch;
4916
4917 switch (o->op_type) {
4918 case OP_RV2SV:
4919 if (svtype > SVt_PVMG)
4920 badtype = "a SCALAR";
4921 break;
4922 case OP_RV2AV:
4923 if (svtype != SVt_PVAV)
4924 badtype = "an ARRAY";
4925 break;
4926 case OP_RV2HV:
6d822dc4 4927 if (svtype != SVt_PVHV)
779c5bc9 4928 badtype = "a HASH";
779c5bc9
GS		 4929 break;
4930 case OP_RV2CV:
4931 if (svtype != SVt_PVCV)
4932 badtype = "a CODE";
4933 break;
4934 }
4935 if (badtype)
cea2e8a9 4936 Perl_croak(aTHX_ "Constant is not %s reference", badtype);
779c5bc9
GS		 4937 return o;
4938 }
2d8e6c8d 4939 name = SvPV(kidsv, n_a);
3280af22 4940 if ((PL_hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
44a8e56a 4941 char *badthing = Nullch;
5dc0d613 4942 switch (o->op_type) {
44a8e56a 4943 case OP_RV2SV:
4944 badthing = "a SCALAR";
4945 break;
4946 case OP_RV2AV:
4947 badthing = "an ARRAY";
4948 break;
4949 case OP_RV2HV:
4950 badthing = "a HASH";
4951 break;
4952 }
4953 if (badthing)
1c846c1f 4954 Perl_croak(aTHX_
44a8e56a 4955 "Can't use bareword (\"%s\") as %s ref while \"strict refs\" in use",
4956 name, badthing);
4957 }
93233ece
CS		 4958 /*
4959 * This is a little tricky. We only want to add the symbol if we
4960 * didn't add it in the lexer. Otherwise we get duplicate strict
4961 * warnings. But if we didn't add it in the lexer, we must at
4962 * least pretend like we wanted to add it even if it existed before,
4963 * or we get possible typo warnings. OPpCONST_ENTERED says
4964 * whether the lexer already added THIS instance of this symbol.
4965 */
5196be3e 4966 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 4967 do {
44a8e56a 4968 gv = gv_fetchpv(name,
748a9306 4969 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 4970 iscv
4971 ? SVt_PVCV
11343788 4972 : o->op_type == OP_RV2SV
a0d0e21e 4973 ? SVt_PV
11343788 4974 : o->op_type == OP_RV2AV
a0d0e21e 4975 ? SVt_PVAV
11343788 4976 : o->op_type == OP_RV2HV
a0d0e21e
LW		 4977 ? SVt_PVHV
4978 : SVt_PVGV);
93233ece
CS		 4979 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
4980 if (gv) {
4981 kid->op_type = OP_GV;
4982 SvREFCNT_dec(kid->op_sv);
350de78d 4983#ifdef USE_ITHREADS
638eceb6 4984 /* XXX hack: dependence on sizeof(PADOP) <= sizeof(SVOP) */
350de78d 4985 kPADOP->op_padix = pad_alloc(OP_GV, SVs_PADTMP);
dd2155a4 4986 SvREFCNT_dec(PAD_SVl(kPADOP->op_padix));
743e66e6 4987 GvIN_PAD_on(gv);
dd2155a4 4988 PAD_SETSV(kPADOP->op_padix, (SV*) SvREFCNT_inc(gv));
350de78d 4989#else
93233ece 4990 kid->op_sv = SvREFCNT_inc(gv);
350de78d 4991#endif
23f1ca44 4992 kid->op_private = 0;
76cd736e 4993 kid->op_ppaddr = PL_ppaddr[OP_GV];
a0d0e21e 4994 }
79072805 4995 }
11343788 4996 return o;
79072805
LW		 4997}
4998
4999OP *
cea2e8a9 5000Perl_ck_ftst(pTHX_ OP *o)
79072805 5001{
11343788 5002 I32 type = o->op_type;
79072805 5003
d0dca557
JD		 5004 if (o->op_flags & OPf_REF) {
5005 /* nothing */
5006 }
5007 else if (o->op_flags & OPf_KIDS && cUNOPo->op_first->op_type != OP_STUB) {
11343788 5008 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805
LW		 5009
5010 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
2d8e6c8d 5011 STRLEN n_a;
a0d0e21e 5012 OP *newop = newGVOP(type, OPf_REF,
2d8e6c8d 5013 gv_fetchpv(SvPVx(kid->op_sv, n_a), TRUE, SVt_PVIO));
11343788 5014 op_free(o);
d0dca557 5015 o = newop;
79072805 5016 }
1af34c76
JH		 5017 else {
5018 if ((PL_hints & HINT_FILETEST_ACCESS) &&
5019 OP_IS_FILETEST_ACCESS(o))
5020 o->op_private |= OPpFT_ACCESS;
5021 }
79072805
LW		 5022 }
5023 else {
11343788 5024 op_free(o);
79072805 5025 if (type == OP_FTTTY)
8fde6460 5026 o = newGVOP(type, OPf_REF, PL_stdingv);
79072805 5027 else
d0dca557 5028 o = newUNOP(type, 0, newDEFSVOP());
79072805 5029 }
11343788 5030 return o;
79072805
LW		 5031}
5032
5033OP *
cea2e8a9 5034Perl_ck_fun(pTHX_ OP *o)
79072805
LW		 5035{
5036 register OP *kid;
5037 OP **tokid;
5038 OP *sibl;
5039 I32 numargs = 0;
11343788 5040 int type = o->op_type;
22c35a8c 5041 register I32 oa = PL_opargs[type] >> OASHIFT;
aeea060c 5042
11343788 5043 if (o->op_flags & OPf_STACKED) {
79072805
LW		 5044 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
5045 oa &= ~OA_OPTIONAL;
5046 else
11343788 5047 return no_fh_allowed(o);
79072805
LW		 5048 }
5049
11343788 5050 if (o->op_flags & OPf_KIDS) {
2d8e6c8d 5051 STRLEN n_a;
11343788
MB		 5052 tokid = &cLISTOPo->op_first;
5053 kid = cLISTOPo->op_first;
8990e307 5054 if (kid->op_type == OP_PUSHMARK ||
155aba94 5055 (kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK))
8990e307 5056 {
79072805
LW		 5057 tokid = &kid->op_sibling;
5058 kid = kid->op_sibling;
5059 }
22c35a8c 5060 if (!kid && PL_opargs[type] & OA_DEFGV)
54b9620d 5061 *tokid = kid = newDEFSVOP();
79072805
LW		 5062
5063 while (oa && kid) {
5064 numargs++;
5065 sibl = kid->op_sibling;
5066 switch (oa & 7) {
5067 case OA_SCALAR:
62c18ce2
GS		 5068 /* list seen where single (scalar) arg expected? */
5069 if (numargs == 1 && !(oa >> 4)
5070 && kid->op_type == OP_LIST && type != OP_SCALAR)
5071 {
5072 return too_many_arguments(o,PL_op_desc[type]);
5073 }
79072805
LW		 5074 scalar(kid);
5075 break;
5076 case OA_LIST:
5077 if (oa < 16) {
5078 kid = 0;
5079 continue;
5080 }
5081 else
5082 list(kid);
5083 break;
5084 case OA_AVREF:
936edb8b 5085 if ((type == OP_PUSH || type == OP_UNSHIFT)
f87c3213 5086 && !kid->op_sibling && ckWARN(WARN_SYNTAX))
9014280d 5087 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
de4864e4 5088 "Useless use of %s with no values",
936edb8b 5089 PL_op_desc[type]);
b2ffa427 5090
79072805 5091 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5092 (kid->op_private & OPpCONST_BARE))
5093 {
2d8e6c8d 5094 char *name = SvPVx(((SVOP*)kid)->op_sv, n_a);
79072805 5095 OP *newop = newAVREF(newGVOP(OP_GV, 0,
85e6fe83 5096 gv_fetchpv(name, TRUE, SVt_PVAV) ));
12bcd1a6
PM		 5097 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
5098 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
57def98f 5099 "Array @%s missing the @ in argument %"IVdf" of %s()",
cf2093f6 5100 name, (IV)numargs, PL_op_desc[type]);
79072805
LW		 5101 op_free(kid);
5102 kid = newop;
5103 kid->op_sibling = sibl;
5104 *tokid = kid;
5105 }
8990e307 5106 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
35cd451c 5107 bad_type(numargs, "array", PL_op_desc[type], kid);
a0d0e21e 5108 mod(kid, type);
79072805
LW		 5109 break;
5110 case OA_HVREF:
5111 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5112 (kid->op_private & OPpCONST_BARE))
5113 {
2d8e6c8d 5114 char *name = SvPVx(((SVOP*)kid)->op_sv, n_a);
79072805 5115 OP *newop = newHVREF(newGVOP(OP_GV, 0,
85e6fe83 5116 gv_fetchpv(name, TRUE, SVt_PVHV) ));
12bcd1a6
PM		 5117 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
5118 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
57def98f 5119 "Hash %%%s missing the %% in argument %"IVdf" of %s()",
cf2093f6 5120 name, (IV)numargs, PL_op_desc[type]);
79072805
LW		 5121 op_free(kid);
5122 kid = newop;
5123 kid->op_sibling = sibl;
5124 *tokid = kid;
5125 }
8990e307 5126 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
35cd451c 5127 bad_type(numargs, "hash", PL_op_desc[type], kid);
a0d0e21e 5128 mod(kid, type);
79072805
LW		 5129 break;
5130 case OA_CVREF:
5131 {
a0d0e21e 5132 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 5133 kid->op_sibling = 0;
5134 linklist(kid);
5135 newop->op_next = newop;
5136 kid = newop;
5137 kid->op_sibling = sibl;
5138 *tokid = kid;
5139 }
5140 break;
5141 case OA_FILEREF:
c340be78 5142 if (kid->op_type != OP_GV && kid->op_type != OP_RV2GV) {
79072805 5143 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5144 (kid->op_private & OPpCONST_BARE))
5145 {
79072805 5146 OP *newop = newGVOP(OP_GV, 0,
2d8e6c8d 5147 gv_fetchpv(SvPVx(((SVOP*)kid)->op_sv, n_a), TRUE,
85e6fe83 5148 SVt_PVIO) );
afbdacea 5149 if (!(o->op_private & 1) && /* if not unop */
8a996ce8 5150 kid == cLISTOPo->op_last)
364daeac 5151 cLISTOPo->op_last = newop;
79072805
LW		 5152 op_free(kid);
5153 kid = newop;
5154 }
1ea32a52
GS		 5155 else if (kid->op_type == OP_READLINE) {
5156 /* neophyte patrol: open(<FH>), close(<FH>) etc. */
53e06cf0 5157 bad_type(numargs, "HANDLE", OP_DESC(o), kid);
1ea32a52 5158 }
79072805 5159 else {
35cd451c 5160 I32 flags = OPf_SPECIAL;
a6c40364 5161 I32 priv = 0;
2c8ac474
GS		 5162 PADOFFSET targ = 0;
5163
35cd451c 5164 /* is this op a FH constructor? */
853846ea 5165 if (is_handle_constructor(o,numargs)) {
2c8ac474 5166 char *name = Nullch;
dd2155a4 5167 STRLEN len = 0;
2c8ac474
GS		 5168
5169 flags = 0;
5170 /* Set a flag to tell rv2gv to vivify
853846ea
NIS		 5171 * need to "prove" flag does not mean something
5172 * else already - NI-S 1999/05/07
2c8ac474
GS		 5173 */
5174 priv = OPpDEREF;
5175 if (kid->op_type == OP_PADSV) {
dd2155a4
DM		 5176 name = PAD_COMPNAME_PV(kid->op_targ);
5177 /* SvCUR of a pad namesv can't be trusted
5178 * (see PL_generation), so calc its length
5179 * manually */
5180 if (name)
5181 len = strlen(name);
5182
2c8ac474
GS		 5183 }
5184 else if (kid->op_type == OP_RV2SV
5185 && kUNOP->op_first->op_type == OP_GV)
5186 {
5187 GV *gv = cGVOPx_gv(kUNOP->op_first);
5188 name = GvNAME(gv);
5189 len = GvNAMELEN(gv);
5190 }
afd1915d
GS		 5191 else if (kid->op_type == OP_AELEM
5192 || kid->op_type == OP_HELEM)
5193 {
0c4b0a3f
JH		 5194 OP *op;
5195
5196 name = 0;
5197 if ((op = ((BINOP*)kid)->op_first)) {
5198 SV *tmpstr = Nullsv;
5199 char *a =
5200 kid->op_type == OP_AELEM ?
5201 "[]" : "{}";
5202 if (((op->op_type == OP_RV2AV) ||
5203 (op->op_type == OP_RV2HV)) &&
5204 (op = ((UNOP*)op)->op_first) &&
5205 (op->op_type == OP_GV)) {
5206 /* packagevar $a[] or $h{} */
5207 GV *gv = cGVOPx_gv(op);
5208 if (gv)
5209 tmpstr =
5210 Perl_newSVpvf(aTHX_
5211 "%s%c...%c",
5212 GvNAME(gv),
5213 a[0], a[1]);
5214 }
5215 else if (op->op_type == OP_PADAV
5216 || op->op_type == OP_PADHV) {
5217 /* lexicalvar $a[] or $h{} */
5218 char *padname =
5219 PAD_COMPNAME_PV(op->op_targ);
5220 if (padname)
5221 tmpstr =
5222 Perl_newSVpvf(aTHX_
5223 "%s%c...%c",
5224 padname + 1,
5225 a[0], a[1]);
5226
5227 }
5228 if (tmpstr) {
5229 name = savepv(SvPVX(tmpstr));
5230 len = strlen(name);
5231 sv_2mortal(tmpstr);
5232 }
5233 }
5234 if (!name) {
5235 name = "__ANONIO__";
5236 len = 10;
5237 }
5238 mod(kid, type);
afd1915d 5239 }
2c8ac474
GS		 5240 if (name) {
5241 SV *namesv;
5242 targ = pad_alloc(OP_RV2GV, SVs_PADTMP);
dd2155a4 5243 namesv = PAD_SVl(targ);
155aba94 5244 (void)SvUPGRADE(namesv, SVt_PV);
2c8ac474
GS		 5245 if (*name != '$')
5246 sv_setpvn(namesv, "$", 1);
5247 sv_catpvn(namesv, name, len);
5248 }
853846ea 5249 }
79072805 5250 kid->op_sibling = 0;
35cd451c 5251 kid = newUNOP(OP_RV2GV, flags, scalar(kid));
2c8ac474
GS		 5252 kid->op_targ = targ;
5253 kid->op_private |= priv;
79072805
LW		 5254 }
5255 kid->op_sibling = sibl;
5256 *tokid = kid;
5257 }
5258 scalar(kid);
5259 break;
5260 case OA_SCALARREF:
a0d0e21e 5261 mod(scalar(kid), type);
79072805
LW		 5262 break;
5263 }
5264 oa >>= 4;
5265 tokid = &kid->op_sibling;
5266 kid = kid->op_sibling;
5267 }
11343788 5268 o->op_private |= numargs;
79072805 5269 if (kid)
53e06cf0 5270 return too_many_arguments(o,OP_DESC(o));
11343788 5271 listkids(o);
79072805 5272 }
22c35a8c 5273 else if (PL_opargs[type] & OA_DEFGV) {
11343788 5274 op_free(o);
54b9620d 5275 return newUNOP(type, 0, newDEFSVOP());
a0d0e21e
LW		 5276 }
5277
79072805
LW		 5278 if (oa) {
5279 while (oa & OA_OPTIONAL)
5280 oa >>= 4;
5281 if (oa && oa != OA_LIST)
53e06cf0 5282 return too_few_arguments(o,OP_DESC(o));
79072805 5283 }
11343788 5284 return o;
79072805
LW		 5285}
5286
5287OP *
cea2e8a9 5288Perl_ck_glob(pTHX_ OP *o)
79072805 5289{
fb73857a 5290 GV *gv;
5291
649da076 5292 o = ck_fun(o);
1f2bfc8a 5293 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 5294 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 5295
b9f751c0
GS		 5296 if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV))
5297 && GvCVu(gv) && GvIMPORTED_CV(gv)))
5298 {
fb73857a 5299 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
b9f751c0 5300 }
b1cb66bf 5301
52bb0670 5302#if !defined(PERL_EXTERNAL_GLOB)
72b16652 5303 /* XXX this can be tightened up and made more failsafe. */
f444d496 5304 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv))) {
7d3fb230 5305 GV *glob_gv;
72b16652 5306 ENTER;
00ca71c1
NIS		 5307 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
5308 newSVpvn("File::Glob", 10), Nullsv, Nullsv, Nullsv);
72b16652 5309 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
7d3fb230
BS		 5310 glob_gv = gv_fetchpv("File::Glob::csh_glob", FALSE, SVt_PVCV);
5311 GvCV(gv) = GvCV(glob_gv);
445266f0 5312 SvREFCNT_inc((SV*)GvCV(gv));
7d3fb230 5313 GvIMPORTED_CV_on(gv);
72b16652
GS		 5314 LEAVE;
5315 }
52bb0670 5316#endif /* PERL_EXTERNAL_GLOB */
72b16652 5317
b9f751c0 5318 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
5196be3e 5319 append_elem(OP_GLOB, o,
80252599 5320 newSVOP(OP_CONST, 0, newSViv(PL_glob_index++)));
1f2bfc8a 5321 o->op_type = OP_LIST;
22c35a8c 5322 o->op_ppaddr = PL_ppaddr[OP_LIST];
1f2bfc8a 5323 cLISTOPo->op_first->op_type = OP_PUSHMARK;
22c35a8c 5324 cLISTOPo->op_first->op_ppaddr = PL_ppaddr[OP_PUSHMARK];
1f2bfc8a 5325 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 5326 append_elem(OP_LIST, o,
1f2bfc8a
MB		 5327 scalar(newUNOP(OP_RV2CV, 0,
5328 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 5329 o = newUNOP(OP_NULL, 0, ck_subr(o));
5330 o->op_targ = OP_GLOB; /* hint at what it used to be */
5331 return o;
b1cb66bf 5332 }
5333 gv = newGVgen("main");
a0d0e21e 5334 gv_IOadd(gv);
11343788
MB		 5335 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
5336 scalarkids(o);
649da076 5337 return o;
79072805
LW		 5338}
5339
5340OP *
cea2e8a9 5341Perl_ck_grep(pTHX_ OP *o)
79072805
LW		 5342{
5343 LOGOP *gwop;
5344 OP *kid;
11343788 5345 OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
79072805 5346
22c35a8c 5347 o->op_ppaddr = PL_ppaddr[OP_GREPSTART];
b7dc083c 5348 NewOp(1101, gwop, 1, LOGOP);
aeea060c 5349
11343788 5350 if (o->op_flags & OPf_STACKED) {
a0d0e21e 5351 OP* k;
11343788
MB		 5352 o = ck_sort(o);
5353 kid = cLISTOPo->op_first->op_sibling;
5354 for (k = cLISTOPo->op_first->op_sibling->op_next; k; k = k->op_next) {
a0d0e21e
LW		 5355 kid = k;
5356 }
5357 kid->op_next = (OP*)gwop;
11343788 5358 o->op_flags &= ~OPf_STACKED;
93a17b20 5359 }
11343788 5360 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 5361 if (type == OP_MAPWHILE)
5362 list(kid);
5363 else
5364 scalar(kid);
11343788 5365 o = ck_fun(o);
3280af22 5366 if (PL_error_count)
11343788 5367 return o;
aeea060c 5368 kid = cLISTOPo->op_first->op_sibling;
79072805 5369 if (kid->op_type != OP_NULL)
cea2e8a9 5370 Perl_croak(aTHX_ "panic: ck_grep");
79072805
LW		 5371 kid = kUNOP->op_first;
5372
a0d0e21e 5373 gwop->op_type = type;
22c35a8c 5374 gwop->op_ppaddr = PL_ppaddr[type];
11343788 5375 gwop->op_first = listkids(o);
79072805
LW		 5376 gwop->op_flags |= OPf_KIDS;
5377 gwop->op_private = 1;
5378 gwop->op_other = LINKLIST(kid);
a0d0e21e 5379 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
79072805
LW		 5380 kid->op_next = (OP*)gwop;
5381
11343788 5382 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 5383 if (!kid || !kid->op_sibling)
53e06cf0 5384 return too_few_arguments(o,OP_DESC(o));
a0d0e21e
LW		 5385 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
5386 mod(kid, OP_GREPSTART);
5387
79072805
LW		 5388 return (OP*)gwop;
5389}
5390
5391OP *
cea2e8a9 5392Perl_ck_index(pTHX_ OP *o)
79072805 5393{
11343788
MB		 5394 if (o->op_flags & OPf_KIDS) {
5395 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
0b71040e
LW		 5396 if (kid)
5397 kid = kid->op_sibling; /* get past "big" */
79072805 5398 if (kid && kid->op_type == OP_CONST)
2779dcf1 5399 fbm_compile(((SVOP*)kid)->op_sv, 0);
79072805 5400 }
11343788 5401 return ck_fun(o);
79072805
LW		 5402}
5403
5404OP *
cea2e8a9 5405Perl_ck_lengthconst(pTHX_ OP *o)
79072805
LW		 5406{
5407 /* XXX length optimization goes here */
11343788 5408 return ck_fun(o);
79072805
LW		 5409}
5410
5411OP *
cea2e8a9 5412Perl_ck_lfun(pTHX_ OP *o)
79072805 5413{
5dc0d613
MB		 5414 OPCODE type = o->op_type;
5415 return modkids(ck_fun(o), type);
79072805
LW		 5416}
5417
5418OP *
cea2e8a9 5419Perl_ck_defined(pTHX_ OP *o) /* 19990527 MJD */
69794302 5420{
12bcd1a6 5421 if ((o->op_flags & OPf_KIDS) && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)) {
d0334bed
GS		 5422 switch (cUNOPo->op_first->op_type) {
5423 case OP_RV2AV:
a8739d98
JH		 5424 /* This is needed for
5425 if (defined %stash::)
5426 to work. Do not break Tk.
5427 */
1c846c1f 5428 break; /* Globals via GV can be undef */
d0334bed
GS		 5429 case OP_PADAV:
5430 case OP_AASSIGN: /* Is this a good idea? */
12bcd1a6 5431 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
f10b0346 5432 "defined(@array) is deprecated");
12bcd1a6 5433 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
cc507455 5434 "\t(Maybe you should just omit the defined()?)\n");
69794302 5435 break;
d0334bed 5436 case OP_RV2HV:
a8739d98
JH		 5437 /* This is needed for
5438 if (defined %stash::)
5439 to work. Do not break Tk.
5440 */
1c846c1f 5441 break; /* Globals via GV can be undef */
d0334bed 5442 case OP_PADHV:
12bcd1a6 5443 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
894356b3 5444 "defined(%%hash) is deprecated");
12bcd1a6 5445 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
cc507455 5446 "\t(Maybe you should just omit the defined()?)\n");
d0334bed
GS		 5447 break;
5448 default:
5449 /* no warning */
5450 break;
5451 }
69794302
MJD		 5452 }
5453 return ck_rfun(o);
5454}
5455
5456OP *
cea2e8a9 5457Perl_ck_rfun(pTHX_ OP *o)
8990e307 5458{
5dc0d613
MB		 5459 OPCODE type = o->op_type;
5460 return refkids(ck_fun(o), type);
8990e307
LW		 5461}
5462
5463OP *
cea2e8a9 5464Perl_ck_listiob(pTHX_ OP *o)
79072805
LW		 5465{
5466 register OP *kid;
aeea060c 5467
11343788 5468 kid = cLISTOPo->op_first;
79072805 5469 if (!kid) {
11343788
MB		 5470 o = force_list(o);
5471 kid = cLISTOPo->op_first;
79072805
LW		 5472 }
5473 if (kid->op_type == OP_PUSHMARK)
5474 kid = kid->op_sibling;
11343788 5475 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 5476 kid = kid->op_sibling;
5477 else if (kid && !kid->op_sibling) { /* print HANDLE; */
5478 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 5479 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 5480 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 5481 cLISTOPo->op_first->op_sibling = kid;
5482 cLISTOPo->op_last = kid;
79072805
LW		 5483 kid = kid->op_sibling;
5484 }
5485 }
b2ffa427 5486
79072805 5487 if (!kid)
54b9620d 5488 append_elem(o->op_type, o, newDEFSVOP());
79072805 5489
2de3dbcc 5490 return listkids(o);
bbce6d69 5491}
5492
5493OP *
b162f9ea
IZ		 5494Perl_ck_sassign(pTHX_ OP *o)
5495{
5496 OP *kid = cLISTOPo->op_first;
5497 /* has a disposable target? */
5498 if ((PL_opargs[kid->op_type] & OA_TARGLEX)
6b66af17
GS		 5499 && !(kid->op_flags & OPf_STACKED)
5500 /* Cannot steal the second time! */
5501 && !(kid->op_private & OPpTARGET_MY))
b162f9ea
IZ		 5502 {
5503 OP *kkid = kid->op_sibling;
5504
5505 /* Can just relocate the target. */
2c2d71f5
JH		 5506 if (kkid && kkid->op_type == OP_PADSV
5507 && !(kkid->op_private & OPpLVAL_INTRO))
5508 {
b162f9ea 5509 kid->op_targ = kkid->op_targ;
743e66e6 5510 kkid->op_targ = 0;
b162f9ea
IZ		 5511 /* Now we do not need PADSV and SASSIGN. */
5512 kid->op_sibling = o->op_sibling; /* NULL */
5513 cLISTOPo->op_first = NULL;
5514 op_free(o);
5515 op_free(kkid);
5516 kid->op_private |= OPpTARGET_MY; /* Used for context settings */
5517 return kid;
5518 }
5519 }
5520 return o;
5521}
5522
5523OP *
cea2e8a9 5524Perl_ck_match(pTHX_ OP *o)
79072805 5525{
5dc0d613 5526 o->op_private |= OPpRUNTIME;
11343788 5527 return o;
79072805
LW		 5528}
5529
5530OP *
f5d5a27c
CS		 5531Perl_ck_method(pTHX_ OP *o)
5532{
5533 OP *kid = cUNOPo->op_first;
5534 if (kid->op_type == OP_CONST) {
5535 SV* sv = kSVOP->op_sv;
5536 if (!(strchr(SvPVX(sv), ':') || strchr(SvPVX(sv), '\''))) {
5537 OP *cmop;
1c846c1f
NIS		 5538 if (!SvREADONLY(sv) || !SvFAKE(sv)) {
5539 sv = newSVpvn_share(SvPVX(sv), SvCUR(sv), 0);
5540 }
5541 else {
5542 kSVOP->op_sv = Nullsv;
5543 }
f5d5a27c 5544 cmop = newSVOP(OP_METHOD_NAMED, 0, sv);
f5d5a27c
CS		 5545 op_free(o);
5546 return cmop;
5547 }
5548 }
5549 return o;
5550}
5551
5552OP *
cea2e8a9 5553Perl_ck_null(pTHX_ OP *o)
79072805 5554{
11343788 5555 return o;
79072805
LW		 5556}
5557
5558OP *
16fe6d59
GS		 5559Perl_ck_open(pTHX_ OP *o)
5560{
5561 HV *table = GvHV(PL_hintgv);
5562 if (table) {
5563 SV **svp;
5564 I32 mode;
5565 svp = hv_fetch(table, "open_IN", 7, FALSE);
5566 if (svp && *svp) {
5567 mode = mode_from_discipline(*svp);
5568 if (mode & O_BINARY)
5569 o->op_private |= OPpOPEN_IN_RAW;
5570 else if (mode & O_TEXT)
5571 o->op_private |= OPpOPEN_IN_CRLF;
5572 }
5573
5574 svp = hv_fetch(table, "open_OUT", 8, FALSE);
5575 if (svp && *svp) {
5576 mode = mode_from_discipline(*svp);
5577 if (mode & O_BINARY)
5578 o->op_private |= OPpOPEN_OUT_RAW;
5579 else if (mode & O_TEXT)
5580 o->op_private |= OPpOPEN_OUT_CRLF;
5581 }
5582 }
5583 if (o->op_type == OP_BACKTICK)
5584 return o;
3b82e551
JH		 5585 {
5586 /* In case of three-arg dup open remove strictness
5587 * from the last arg if it is a bareword. */
5588 OP *first = cLISTOPx(o)->op_first; /* The pushmark. */
5589 OP *last = cLISTOPx(o)->op_last; /* The bareword. */
5590 OP *oa;
5591 char *mode;
5592
5593 if ((last->op_type == OP_CONST) && /* The bareword. */
5594 (last->op_private & OPpCONST_BARE) &&
5595 (last->op_private & OPpCONST_STRICT) &&
5596 (oa = first->op_sibling) && /* The fh. */
5597 (oa = oa->op_sibling) && /* The mode. */
5598 SvPOK(((SVOP*)oa)->op_sv) &&
5599 (mode = SvPVX(((SVOP*)oa)->op_sv)) &&
5600 mode[0] == '>' && mode[1] == '&' && /* A dup open. */
5601 (last == oa->op_sibling)) /* The bareword. */
5602 last->op_private &= ~OPpCONST_STRICT;
5603 }
16fe6d59
GS		 5604 return ck_fun(o);
5605}
5606
5607OP *
cea2e8a9 5608Perl_ck_repeat(pTHX_ OP *o)
79072805 5609{
11343788
MB		 5610 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
5611 o->op_private |= OPpREPEAT_DOLIST;
5612 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 5613 }
5614 else
11343788
MB		 5615 scalar(o);
5616 return o;
79072805
LW		 5617}
5618
5619OP *
cea2e8a9 5620Perl_ck_require(pTHX_ OP *o)
8990e307 5621{
ec4ab249
GA		 5622 GV* gv;
5623
11343788
MB		 5624 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
5625 SVOP *kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 5626
5627 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
8990e307 5628 char *s;
a0d0e21e
LW		 5629 for (s = SvPVX(kid->op_sv); *s; s++) {
5630 if (*s == ':' && s[1] == ':') {
5631 *s = '/';
1aef975c 5632 Move(s+2, s+1, strlen(s+2)+1, char);
a0d0e21e
LW		 5633 --SvCUR(kid->op_sv);
5634 }
8990e307 5635 }
ce3b816e
GS		 5636 if (SvREADONLY(kid->op_sv)) {
5637 SvREADONLY_off(kid->op_sv);
5638 sv_catpvn(kid->op_sv, ".pm", 3);
5639 SvREADONLY_on(kid->op_sv);
5640 }
5641 else
5642 sv_catpvn(kid->op_sv, ".pm", 3);
8990e307
LW		 5643 }
5644 }
ec4ab249
GA		 5645
5646 /* handle override, if any */
5647 gv = gv_fetchpv("require", FALSE, SVt_PVCV);
b9f751c0 5648 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv)))
ec4ab249
GA		 5649 gv = gv_fetchpv("CORE::GLOBAL::require", FALSE, SVt_PVCV);
5650
b9f751c0 5651 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
ec4ab249
GA		 5652 OP *kid = cUNOPo->op_first;
5653 cUNOPo->op_first = 0;
5654 op_free(o);
5655 return ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
5656 append_elem(OP_LIST, kid,
5657 scalar(newUNOP(OP_RV2CV, 0,
5658 newGVOP(OP_GV, 0,
5659 gv))))));
5660 }
5661
11343788 5662 return ck_fun(o);
8990e307
LW		 5663}
5664
78f9721b
SM		 5665OP *
5666Perl_ck_return(pTHX_ OP *o)
5667{
5668 OP *kid;
5669 if (CvLVALUE(PL_compcv)) {
5670 for (kid = cLISTOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
5671 mod(kid, OP_LEAVESUBLV);
5672 }
5673 return o;
5674}
5675
22c35a8c 5676#if 0
8990e307 5677OP *
cea2e8a9 5678Perl_ck_retarget(pTHX_ OP *o)
79072805 5679{
cea2e8a9 5680 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805 5681 /* STUB */
11343788 5682 return o;
79072805 5683}
22c35a8c 5684#endif
79072805
LW		 5685
5686OP *
cea2e8a9 5687Perl_ck_select(pTHX_ OP *o)
79072805 5688{
c07a80fd 5689 OP* kid;
11343788
MB		 5690 if (o->op_flags & OPf_KIDS) {
5691 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 5692 if (kid && kid->op_sibling) {
11343788 5693 o->op_type = OP_SSELECT;
22c35a8c 5694 o->op_ppaddr = PL_ppaddr[OP_SSELECT];
11343788
MB		 5695 o = ck_fun(o);
5696 return fold_constants(o);
79072805
LW		 5697 }
5698 }
11343788
MB		 5699 o = ck_fun(o);
5700 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 5701 if (kid && kid->op_type == OP_RV2GV)
5702 kid->op_private &= ~HINT_STRICT_REFS;
11343788 5703 return o;
79072805
LW		 5704}
5705
5706OP *
cea2e8a9 5707Perl_ck_shift(pTHX_ OP *o)
79072805 5708{
11343788 5709 I32 type = o->op_type;
79072805 5710
11343788 5711 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2 5712 OP *argop;
b2ffa427 5713
11343788 5714 op_free(o);
6d4ff0d2 5715 argop = newUNOP(OP_RV2AV, 0,
8fde6460 5716 scalar(newGVOP(OP_GV, 0, CvUNIQUE(PL_compcv) ? PL_argvgv : PL_defgv)));
6d4ff0d2 5717 return newUNOP(type, 0, scalar(argop));
79072805 5718 }
11343788 5719 return scalar(modkids(ck_fun(o), type));
79072805
LW		 5720}
5721
5722OP *
cea2e8a9 5723Perl_ck_sort(pTHX_ OP *o)
79072805 5724{
8e3f9bdf 5725 OP *firstkid;
bbce6d69 5726
9ea6e965 5727 if (o->op_type == OP_SORT && o->op_flags & OPf_STACKED)
51a19bc0 5728 simplify_sort(o);
8e3f9bdf
GS		 5729 firstkid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
5730 if (o->op_flags & OPf_STACKED) { /* may have been cleared */
9c5ffd7c 5731 OP *k = NULL;
8e3f9bdf 5732 OP *kid = cUNOPx(firstkid)->op_first; /* get past null */
79072805 5733
463ee0b2 5734 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 5735 linklist(kid);
463ee0b2
LW		 5736 if (kid->op_type == OP_SCOPE) {
5737 k = kid->op_next;
5738 kid->op_next = 0;
79072805 5739 }
463ee0b2 5740 else if (kid->op_type == OP_LEAVE) {
11343788 5741 if (o->op_type == OP_SORT) {
93c66552 5742 op_null(kid); /* wipe out leave */
748a9306 5743 kid->op_next = kid;
463ee0b2 5744
748a9306
LW		 5745 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
5746 if (k->op_next == kid)
5747 k->op_next = 0;
71a29c3c
GS		 5748 /* don't descend into loops */
5749 else if (k->op_type == OP_ENTERLOOP
5750 || k->op_type == OP_ENTERITER)
5751 {
5752 k = cLOOPx(k)->op_lastop;
5753 }
748a9306 5754 }
463ee0b2 5755 }
748a9306
LW		 5756 else
5757 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 5758 k = kLISTOP->op_first;
463ee0b2 5759 }
a2efc822 5760 CALL_PEEP(k);
a0d0e21e 5761
8e3f9bdf
GS		 5762 kid = firstkid;
5763 if (o->op_type == OP_SORT) {
5764 /* provide scalar context for comparison function/block */
5765 kid = scalar(kid);
a0d0e21e 5766 kid->op_next = kid;
8e3f9bdf 5767 }
a0d0e21e
LW		 5768 else
5769 kid->op_next = k;
11343788 5770 o->op_flags |= OPf_SPECIAL;
79072805 5771 }
c6e96bcb 5772 else if (kid->op_type == OP_RV2SV || kid->op_type == OP_PADSV)
93c66552 5773 op_null(firstkid);
8e3f9bdf
GS		 5774
5775 firstkid = firstkid->op_sibling;
79072805 5776 }
bbce6d69 5777
8e3f9bdf
GS		 5778 /* provide list context for arguments */
5779 if (o->op_type == OP_SORT)
5780 list(firstkid);
5781
11343788 5782 return o;
79072805 5783}
bda4119b
GS		 5784
5785STATIC void
cea2e8a9 5786S_simplify_sort(pTHX_ OP *o)
9c007264
JH		 5787{
5788 register OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
5789 OP *k;
5790 int reversed;
350de78d 5791 GV *gv;
9c007264
JH		 5792 if (!(o->op_flags & OPf_STACKED))
5793 return;
1c846c1f
NIS		 5794 GvMULTI_on(gv_fetchpv("a", TRUE, SVt_PV));
5795 GvMULTI_on(gv_fetchpv("b", TRUE, SVt_PV));
82092f1d 5796 kid = kUNOP->op_first; /* get past null */
9c007264
JH		 5797 if (kid->op_type != OP_SCOPE)
5798 return;
5799 kid = kLISTOP->op_last; /* get past scope */
5800 switch(kid->op_type) {
5801 case OP_NCMP:
5802 case OP_I_NCMP:
5803 case OP_SCMP:
5804 break;
5805 default:
5806 return;
5807 }
5808 k = kid; /* remember this node*/
5809 if (kBINOP->op_first->op_type != OP_RV2SV)
5810 return;
5811 kid = kBINOP->op_first; /* get past cmp */
5812 if (kUNOP->op_first->op_type != OP_GV)
5813 return;
5814 kid = kUNOP->op_first; /* get past rv2sv */
638eceb6 5815 gv = kGVOP_gv;
350de78d 5816 if (GvSTASH(gv) != PL_curstash)
9c007264 5817 return;
350de78d 5818 if (strEQ(GvNAME(gv), "a"))
9c007264 5819 reversed = 0;
0f79a09d 5820 else if (strEQ(GvNAME(gv), "b"))
9c007264
JH		 5821 reversed = 1;
5822 else
5823 return;
5824 kid = k; /* back to cmp */
5825 if (kBINOP->op_last->op_type != OP_RV2SV)
5826 return;
5827 kid = kBINOP->op_last; /* down to 2nd arg */
5828 if (kUNOP->op_first->op_type != OP_GV)
5829 return;
5830 kid = kUNOP->op_first; /* get past rv2sv */
638eceb6 5831 gv = kGVOP_gv;
350de78d 5832 if (GvSTASH(gv) != PL_curstash
9c007264 5833 || ( reversed
350de78d
GS		 5834 ? strNE(GvNAME(gv), "a")
5835 : strNE(GvNAME(gv), "b")))
9c007264
JH		 5836 return;
5837 o->op_flags &= ~(OPf_STACKED | OPf_SPECIAL);
5838 if (reversed)
5839 o->op_private |= OPpSORT_REVERSE;
5840 if (k->op_type == OP_NCMP)
5841 o->op_private |= OPpSORT_NUMERIC;
5842 if (k->op_type == OP_I_NCMP)
5843 o->op_private |= OPpSORT_NUMERIC | OPpSORT_INTEGER;
e507f050
SM		 5844 kid = cLISTOPo->op_first->op_sibling;
5845 cLISTOPo->op_first->op_sibling = kid->op_sibling; /* bypass old block */
5846 op_free(kid); /* then delete it */
9c007264 5847}
79072805
LW		 5848
5849OP *
cea2e8a9 5850Perl_ck_split(pTHX_ OP *o)
79072805
LW		 5851{
5852 register OP *kid;
aeea060c 5853
11343788
MB		 5854 if (o->op_flags & OPf_STACKED)
5855 return no_fh_allowed(o);
79072805 5856
11343788 5857 kid = cLISTOPo->op_first;
8990e307 5858 if (kid->op_type != OP_NULL)
cea2e8a9 5859 Perl_croak(aTHX_ "panic: ck_split");
8990e307 5860 kid = kid->op_sibling;
11343788
MB		 5861 op_free(cLISTOPo->op_first);
5862 cLISTOPo->op_first = kid;
85e6fe83 5863 if (!kid) {
79cb57f6 5864 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpvn(" ", 1));
11343788 5865 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 5866 }
79072805 5867
de4bf5b3 5868 if (kid->op_type != OP_MATCH || kid->op_flags & OPf_STACKED) {
79072805 5869 OP *sibl = kid->op_sibling;
463ee0b2 5870 kid->op_sibling = 0;
79072805 5871 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, Nullop);
11343788
MB		 5872 if (cLISTOPo->op_first == cLISTOPo->op_last)
5873 cLISTOPo->op_last = kid;
5874 cLISTOPo->op_first = kid;
79072805
LW		 5875 kid->op_sibling = sibl;
5876 }
5877
5878 kid->op_type = OP_PUSHRE;
22c35a8c 5879 kid->op_ppaddr = PL_ppaddr[OP_PUSHRE];
79072805 5880 scalar(kid);
f34840d8
MJD		 5881 if (ckWARN(WARN_REGEXP) && ((PMOP *)kid)->op_pmflags & PMf_GLOBAL) {
5882 Perl_warner(aTHX_ packWARN(WARN_REGEXP),
5883 "Use of /g modifier is meaningless in split");
5884 }
79072805
LW		 5885
5886 if (!kid->op_sibling)
54b9620d 5887 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 5888
5889 kid = kid->op_sibling;
5890 scalar(kid);
5891
5892 if (!kid->op_sibling)
11343788 5893 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
79072805
LW		 5894
5895 kid = kid->op_sibling;
5896 scalar(kid);
5897
5898 if (kid->op_sibling)
53e06cf0 5899 return too_many_arguments(o,OP_DESC(o));
79072805 5900
11343788 5901 return o;
79072805
LW		 5902}
5903
5904OP *
1c846c1f 5905Perl_ck_join(pTHX_ OP *o)
eb6e2d6f
GS		 5906{
5907 if (ckWARN(WARN_SYNTAX)) {
5908 OP *kid = cLISTOPo->op_first->op_sibling;
5909 if (kid && kid->op_type == OP_MATCH) {
5910 char *pmstr = "STRING";
aaa362c4
RS		 5911 if (PM_GETRE(kPMOP))
5912 pmstr = PM_GETRE(kPMOP)->precomp;
9014280d 5913 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
eb6e2d6f
GS		 5914 "/%s/ should probably be written as \"%s\"",
5915 pmstr, pmstr);
5916 }
5917 }
5918 return ck_fun(o);
5919}
5920
5921OP *
cea2e8a9 5922Perl_ck_subr(pTHX_ OP *o)
79072805 5923{
11343788
MB		 5924 OP *prev = ((cUNOPo->op_first->op_sibling)
5925 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
5926 OP *o2 = prev->op_sibling;
4633a7c4
LW		 5927 OP *cvop;
5928 char *proto = 0;
5929 CV *cv = 0;
46fc3d4c 5930 GV *namegv = 0;
4633a7c4
LW		 5931 int optional = 0;
5932 I32 arg = 0;
5b794e05 5933 I32 contextclass = 0;
90b7f708 5934 char *e = 0;
2d8e6c8d 5935 STRLEN n_a;
06492da6 5936 bool delete=0;
4633a7c4 5937
d3011074 5938 o->op_private |= OPpENTERSUB_HASTARG;
11343788 5939 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 5940 if (cvop->op_type == OP_RV2CV) {
5941 SVOP* tmpop;
11343788 5942 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
93c66552 5943 op_null(cvop); /* disable rv2cv */
4633a7c4 5944 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
76cd736e 5945 if (tmpop->op_type == OP_GV && !(o->op_private & OPpENTERSUB_AMPER)) {
638eceb6 5946 GV *gv = cGVOPx_gv(tmpop);
350de78d 5947 cv = GvCVu(gv);
76cd736e
GS		 5948 if (!cv)
5949 tmpop->op_private |= OPpEARLY_CV;
06492da6
SF		 5950 else {
5951 if (SvPOK(cv)) {
5952 namegv = CvANON(cv) ? gv : CvGV(cv);
5953 proto = SvPV((SV*)cv, n_a);
5954 }
5955 if (CvASSERTION(cv)) {
5956 if (PL_hints & HINT_ASSERTING) {
5957 if (PERLDB_ASSERTION && PL_curstash != PL_debstash)
5958 o->op_private |= OPpENTERSUB_DB;
5959 }
8fa7688f
SF		 5960 else {
5961 delete=1;
5962 if (ckWARN(WARN_ASSERTIONS) && !(PL_hints & HINT_ASSERTIONSSEEN)) {
5963 Perl_warner(aTHX_ packWARN(WARN_ASSERTIONS),
5964 "Impossible to activate assertion call");
5965 }
5966 }
06492da6 5967 }
46fc3d4c 5968 }
4633a7c4
LW		 5969 }
5970 }
f5d5a27c 5971 else if (cvop->op_type == OP_METHOD || cvop->op_type == OP_METHOD_NAMED) {
7a52d87a
GS		 5972 if (o2->op_type == OP_CONST)
5973 o2->op_private &= ~OPpCONST_STRICT;
58a40671
GS		 5974 else if (o2->op_type == OP_LIST) {
5975 OP *o = ((UNOP*)o2)->op_first->op_sibling;
5976 if (o && o->op_type == OP_CONST)
5977 o->op_private &= ~OPpCONST_STRICT;
5978 }
7a52d87a 5979 }
3280af22
NIS		 5980 o->op_private |= (PL_hints & HINT_STRICT_REFS);
5981 if (PERLDB_SUB && PL_curstash != PL_debstash)
11343788
MB		 5982 o->op_private |= OPpENTERSUB_DB;
5983 while (o2 != cvop) {
4633a7c4
LW		 5984 if (proto) {
5985 switch (*proto) {
5986 case '\0':
5dc0d613 5987 return too_many_arguments(o, gv_ename(namegv));
4633a7c4
LW		 5988 case ';':
5989 optional = 1;
5990 proto++;
5991 continue;
5992 case '$':
5993 proto++;
5994 arg++;
11343788 5995 scalar(o2);
4633a7c4
LW		 5996 break;
5997 case '%':
5998 case '@':
11343788 5999 list(o2);
4633a7c4
LW		 6000 arg++;
6001 break;
6002 case '&':
6003 proto++;
6004 arg++;
11343788 6005 if (o2->op_type != OP_REFGEN && o2->op_type != OP_UNDEF)
75fc29ea
GS		 6006 bad_type(arg,
6007 arg == 1 ? "block or sub {}" : "sub {}",
6008 gv_ename(namegv), o2);
4633a7c4
LW		 6009 break;
6010 case '*':
2ba6ecf4 6011 /* '*' allows any scalar type, including bareword */
4633a7c4
LW		 6012 proto++;
6013 arg++;
11343788 6014 if (o2->op_type == OP_RV2GV)
2ba6ecf4 6015 goto wrapref; /* autoconvert GLOB -> GLOBref */
7a52d87a
GS		 6016 else if (o2->op_type == OP_CONST)
6017 o2->op_private &= ~OPpCONST_STRICT;
9675f7ac
GS		 6018 else if (o2->op_type == OP_ENTERSUB) {
6019 /* accidental subroutine, revert to bareword */
6020 OP *gvop = ((UNOP*)o2)->op_first;
6021 if (gvop && gvop->op_type == OP_NULL) {
6022 gvop = ((UNOP*)gvop)->op_first;
6023 if (gvop) {
6024 for (; gvop->op_sibling; gvop = gvop->op_sibling)
6025 ;
6026 if (gvop &&
6027 (gvop->op_private & OPpENTERSUB_NOPAREN) &&
6028 (gvop = ((UNOP*)gvop)->op_first) &&
6029 gvop->op_type == OP_GV)
6030 {
638eceb6 6031 GV *gv = cGVOPx_gv(gvop);
9675f7ac 6032 OP *sibling = o2->op_sibling;
2692f720 6033 SV *n = newSVpvn("",0);
9675f7ac 6034 op_free(o2);
2692f720
GS		 6035 gv_fullname3(n, gv, "");
6036 if (SvCUR(n)>6 && strnEQ(SvPVX(n),"main::",6))
6037 sv_chop(n, SvPVX(n)+6);
6038 o2 = newSVOP(OP_CONST, 0, n);
9675f7ac
GS		 6039 prev->op_sibling = o2;
6040 o2->op_sibling = sibling;
6041 }
6042 }
6043 }
6044 }
2ba6ecf4
GS		 6045 scalar(o2);
6046 break;
5b794e05
JH		 6047 case '[': case ']':
6048 goto oops;
6049 break;
4633a7c4
LW		 6050 case '\\':
6051 proto++;
6052 arg++;
5b794e05 6053 again:
4633a7c4 6054 switch (*proto++) {
5b794e05
JH		 6055 case '[':
6056 if (contextclass++ == 0) {
841d93c8 6057 e = strchr(proto, ']');
5b794e05
JH		 6058 if (!e || e == proto)
6059 goto oops;
6060 }
6061 else
6062 goto oops;
6063 goto again;
6064 break;
6065 case ']':
466bafcd
RGS		 6066 if (contextclass) {
6067 char *p = proto;
6068 char s = *p;
6069 contextclass = 0;
6070 *p = '\0';
6071 while (*--p != '[');
1eb1540c 6072 bad_type(arg, Perl_form(aTHX_ "one of %s", p),
466bafcd
RGS		 6073 gv_ename(namegv), o2);
6074 *proto = s;
6075 } else
5b794e05
JH		 6076 goto oops;
6077 break;
4633a7c4 6078 case '*':
5b794e05
JH		 6079 if (o2->op_type == OP_RV2GV)
6080 goto wrapref;
6081 if (!contextclass)
6082 bad_type(arg, "symbol", gv_ename(namegv), o2);
6083 break;
4633a7c4 6084 case '&':
5b794e05
JH		 6085 if (o2->op_type == OP_ENTERSUB)
6086 goto wrapref;
6087 if (!contextclass)
6088 bad_type(arg, "subroutine entry", gv_ename(namegv), o2);
6089 break;
4633a7c4 6090 case '$':
5b794e05
JH		 6091 if (o2->op_type == OP_RV2SV ||
6092 o2->op_type == OP_PADSV ||
6093 o2->op_type == OP_HELEM ||
6094 o2->op_type == OP_AELEM ||
6095 o2->op_type == OP_THREADSV)
6096 goto wrapref;
6097 if (!contextclass)
5dc0d613 6098 bad_type(arg, "scalar", gv_ename(namegv), o2);
5b794e05 6099 break;
4633a7c4 6100 case '@':
5b794e05
JH		 6101 if (o2->op_type == OP_RV2AV ||
6102 o2->op_type == OP_PADAV)
6103 goto wrapref;
6104 if (!contextclass)
5dc0d613 6105 bad_type(arg, "array", gv_ename(namegv), o2);
5b794e05 6106 break;
4633a7c4 6107 case '%':
5b794e05
JH		 6108 if (o2->op_type == OP_RV2HV ||
6109 o2->op_type == OP_PADHV)
6110 goto wrapref;
6111 if (!contextclass)
6112 bad_type(arg, "hash", gv_ename(namegv), o2);
6113 break;
6114 wrapref:
4633a7c4 6115 {
11343788 6116 OP* kid = o2;
6fa846a0 6117 OP* sib = kid->op_sibling;
4633a7c4 6118 kid->op_sibling = 0;
6fa846a0
GS		 6119 o2 = newUNOP(OP_REFGEN, 0, kid);
6120 o2->op_sibling = sib;
e858de61 6121 prev->op_sibling = o2;
4633a7c4 6122 }
841d93c8 6123 if (contextclass && e) {
5b794e05
JH		 6124 proto = e + 1;
6125 contextclass = 0;
6126 }
4633a7c4
LW		 6127 break;
6128 default: goto oops;
6129 }
5b794e05
JH		 6130 if (contextclass)
6131 goto again;
4633a7c4 6132 break;
b1cb66bf 6133 case ' ':
6134 proto++;
6135 continue;
4633a7c4
LW		 6136 default:
6137 oops:
35c1215d
NC		 6138 Perl_croak(aTHX_ "Malformed prototype for %s: %"SVf,
6139 gv_ename(namegv), cv);
4633a7c4
LW		 6140 }
6141 }
6142 else
11343788
MB		 6143 list(o2);
6144 mod(o2, OP_ENTERSUB);
6145 prev = o2;
6146 o2 = o2->op_sibling;
4633a7c4 6147 }
fb73857a 6148 if (proto && !optional &&
6149 (*proto && *proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 6150 return too_few_arguments(o, gv_ename(namegv));
06492da6
SF		 6151 if(delete) {
6152 op_free(o);
6153 o=newSVOP(OP_CONST, 0, newSViv(0));
6154 }
11343788 6155 return o;
79072805
LW		 6156}
6157
6158OP *
cea2e8a9 6159Perl_ck_svconst(pTHX_ OP *o)
8990e307 6160{
11343788
MB		 6161 SvREADONLY_on(cSVOPo->op_sv);
6162 return o;
8990e307
LW		 6163}
6164
6165OP *
cea2e8a9 6166Perl_ck_trunc(pTHX_ OP *o)
79072805 6167{
11343788
MB		 6168 if (o->op_flags & OPf_KIDS) {
6169 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 6170
a0d0e21e
LW		 6171 if (kid->op_type == OP_NULL)
6172 kid = (SVOP*)kid->op_sibling;
bb53490d
GS		 6173 if (kid && kid->op_type == OP_CONST &&
6174 (kid->op_private & OPpCONST_BARE))
6175 {
11343788 6176 o->op_flags |= OPf_SPECIAL;
bb53490d
GS		 6177 kid->op_private &= ~OPpCONST_STRICT;
6178 }
79072805 6179 }
11343788 6180 return ck_fun(o);
79072805
LW		 6181}
6182
35fba0d9
RG		 6183OP *
6184Perl_ck_substr(pTHX_ OP *o)
6185{
6186 o = ck_fun(o);
6187 if ((o->op_flags & OPf_KIDS) && o->op_private == 4) {
6188 OP *kid = cLISTOPo->op_first;
6189
6190 if (kid->op_type == OP_NULL)
6191 kid = kid->op_sibling;
6192 if (kid)
6193 kid->op_flags |= OPf_MOD;
6194
6195 }
6196 return o;
6197}
6198
463ee0b2
LW		 6199/* A peephole optimizer. We visit the ops in the order they're to execute. */
6200
79072805 6201void
864dbfa3 6202Perl_peep(pTHX_ register OP *o)
79072805
LW		 6203{
6204 register OP* oldop = 0;
2d8e6c8d 6205
a0d0e21e 6206 if (!o || o->op_seq)
79072805 6207 return;
a0d0e21e 6208 ENTER;
462e5cf6 6209 SAVEOP();
7766f137 6210 SAVEVPTR(PL_curcop);
a0d0e21e
LW		 6211 for (; o; o = o->op_next) {
6212 if (o->op_seq)
6213 break;
cfa2c302
PJ		 6214 /* The special value -1 is used by the B::C compiler backend to indicate
6215 * that an op is statically defined and should not be freed */
6216 if (!PL_op_seqmax || PL_op_seqmax == (U16)-1)
6217 PL_op_seqmax = 1;
533c011a 6218 PL_op = o;
a0d0e21e 6219 switch (o->op_type) {
acb36ea4 6220 case OP_SETSTATE:
a0d0e21e
LW		 6221 case OP_NEXTSTATE:
6222 case OP_DBSTATE:
3280af22
NIS		 6223 PL_curcop = ((COP*)o); /* for warnings */
6224 o->op_seq = PL_op_seqmax++;
a0d0e21e
LW		 6225 break;
6226
a0d0e21e 6227 case OP_CONST:
7a52d87a
GS		 6228 if (cSVOPo->op_private & OPpCONST_STRICT)
6229 no_bareword_allowed(o);
7766f137 6230#ifdef USE_ITHREADS
3848b962 6231 case OP_METHOD_NAMED:
7766f137
GS		 6232 /* Relocate sv to the pad for thread safety.
6233 * Despite being a "constant", the SV is written to,
6234 * for reference counts, sv_upgrade() etc. */
6235 if (cSVOP->op_sv) {
6236 PADOFFSET ix = pad_alloc(OP_CONST, SVs_PADTMP);
330e22d5 6237 if (o->op_type == OP_CONST && SvPADTMP(cSVOPo->op_sv)) {
6a7129a1 6238 /* If op_sv is already a PADTMP then it is being used by
9a049f1c 6239 * some pad, so make a copy. */
dd2155a4
DM		 6240 sv_setsv(PAD_SVl(ix),cSVOPo->op_sv);
6241 SvREADONLY_on(PAD_SVl(ix));
6a7129a1
GS		 6242 SvREFCNT_dec(cSVOPo->op_sv);
6243 }
6244 else {
dd2155a4 6245 SvREFCNT_dec(PAD_SVl(ix));
6a7129a1 6246 SvPADTMP_on(cSVOPo->op_sv);
dd2155a4 6247 PAD_SETSV(ix, cSVOPo->op_sv);
9a049f1c 6248 /* XXX I don't know how this isn't readonly already. */
dd2155a4 6249 SvREADONLY_on(PAD_SVl(ix));
6a7129a1 6250 }
7766f137
GS		 6251 cSVOPo->op_sv = Nullsv;
6252 o->op_targ = ix;
6253 }
6254#endif
07447971
GS		 6255 o->op_seq = PL_op_seqmax++;
6256 break;
6257
ed7ab888 6258 case OP_CONCAT:
b162f9ea
IZ		 6259 if (o->op_next && o->op_next->op_type == OP_STRINGIFY) {
6260 if (o->op_next->op_private & OPpTARGET_MY) {
69b47968 6261 if (o->op_flags & OPf_STACKED) /* chained concats */
b162f9ea 6262 goto ignore_optimization;
cd06dffe 6263 else {
07447971 6264 /* assert(PL_opargs[o->op_type] & OA_TARGLEX); */
b162f9ea 6265 o->op_targ = o->op_next->op_targ;
743e66e6 6266 o->op_next->op_targ = 0;
2c2d71f5 6267 o->op_private |= OPpTARGET_MY;
b162f9ea
IZ		 6268 }
6269 }
93c66552 6270 op_null(o->op_next);
b162f9ea
IZ		 6271 }
6272 ignore_optimization:
3280af22 6273 o->op_seq = PL_op_seqmax++;
a0d0e21e 6274 break;
8990e307 6275 case OP_STUB:
54310121 6276 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
3280af22 6277 o->op_seq = PL_op_seqmax++;
54310121 6278 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 6279 }
748a9306 6280 goto nothin;
79072805 6281 case OP_NULL:
acb36ea4
GS		 6282 if (o->op_targ == OP_NEXTSTATE
6283 || o->op_targ == OP_DBSTATE
6284 || o->op_targ == OP_SETSTATE)
6285 {
3280af22 6286 PL_curcop = ((COP*)o);
acb36ea4 6287 }
dad75012
AMS		 6288 /* XXX: We avoid setting op_seq here to prevent later calls
6289 to peep() from mistakenly concluding that optimisation
6290 has already occurred. This doesn't fix the real problem,
6291 though (See 20010220.007). AMS 20010719 */
6292 if (oldop && o->op_next) {
6293 oldop->op_next = o->op_next;
6294 continue;
6295 }
6296 break;
79072805 6297 case OP_SCALAR:
93a17b20 6298 case OP_LINESEQ:
463ee0b2 6299 case OP_SCOPE:
748a9306 6300 nothin:
a0d0e21e
LW		 6301 if (oldop && o->op_next) {
6302 oldop->op_next = o->op_next;
79072805
LW		 6303 continue;
6304 }
3280af22 6305 o->op_seq = PL_op_seqmax++;
79072805
LW		 6306 break;
6307
6308 case OP_GV:
a0d0e21e 6309 if (o->op_next->op_type == OP_RV2SV) {
64aac5a9 6310 if (!(o->op_next->op_private & OPpDEREF)) {
93c66552 6311 op_null(o->op_next);
64aac5a9
GS		 6312 o->op_private |= o->op_next->op_private & (OPpLVAL_INTRO
6313 | OPpOUR_INTRO);
a0d0e21e
LW		 6314 o->op_next = o->op_next->op_next;
6315 o->op_type = OP_GVSV;
22c35a8c 6316 o->op_ppaddr = PL_ppaddr[OP_GVSV];
8990e307
LW		 6317 }
6318 }
a0d0e21e
LW		 6319 else if (o->op_next->op_type == OP_RV2AV) {
6320 OP* pop = o->op_next->op_next;
6321 IV i;
f9dc862f 6322 if (pop && pop->op_type == OP_CONST &&
533c011a 6323 (PL_op = pop->op_next) &&
8990e307 6324 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 6325 !(pop->op_next->op_private &
78f9721b 6326 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF|OPpMAYBE_LVSUB)) &&
b0840a2a 6327 (i = SvIV(((SVOP*)pop)->op_sv) - PL_curcop->cop_arybase)
a0d0e21e 6328 <= 255 &&
8990e307
LW		 6329 i >= 0)
6330 {
350de78d 6331 GV *gv;
93c66552
DM		 6332 op_null(o->op_next);
6333 op_null(pop->op_next);
6334 op_null(pop);
a0d0e21e
LW		 6335 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
6336 o->op_next = pop->op_next->op_next;
6337 o->op_type = OP_AELEMFAST;
22c35a8c 6338 o->op_ppaddr = PL_ppaddr[OP_AELEMFAST];
a0d0e21e 6339 o->op_private = (U8)i;
638eceb6 6340 gv = cGVOPo_gv;
350de78d 6341 GvAVn(gv);
8990e307 6342 }
79072805 6343 }
e476b1b5 6344 else if ((o->op_private & OPpEARLY_CV) && ckWARN(WARN_PROTOTYPE)) {
638eceb6 6345 GV *gv = cGVOPo_gv;
76cd736e
GS		 6346 if (SvTYPE(gv) == SVt_PVGV && GvCV(gv) && SvPVX(GvCV(gv))) {
6347 /* XXX could check prototype here instead of just carping */
6348 SV *sv = sv_newmortal();
6349 gv_efullname3(sv, gv, Nullch);
9014280d 6350 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE),
35c1215d
NC		 6351 "%"SVf"() called too early to check prototype",
6352 sv);
76cd736e
GS		 6353 }
6354 }
89de2904
AMS		 6355 else if (o->op_next->op_type == OP_READLINE
6356 && o->op_next->op_next->op_type == OP_CONCAT
6357 && (o->op_next->op_next->op_flags & OPf_STACKED))
6358 {
d2c45030
AMS		 6359 /* Turn "$a .= <FH>" into an OP_RCATLINE. AMS 20010917 */
6360 o->op_type = OP_RCATLINE;
6361 o->op_flags |= OPf_STACKED;
6362 o->op_ppaddr = PL_ppaddr[OP_RCATLINE];
89de2904 6363 op_null(o->op_next->op_next);
d2c45030 6364 op_null(o->op_next);
89de2904 6365 }
76cd736e 6366
3280af22 6367 o->op_seq = PL_op_seqmax++;
79072805
LW		 6368 break;
6369
a0d0e21e 6370 case OP_MAPWHILE:
79072805
LW		 6371 case OP_GREPWHILE:
6372 case OP_AND:
6373 case OP_OR:
c963b151 6374 case OP_DOR:
2c2d71f5
JH		 6375 case OP_ANDASSIGN:
6376 case OP_ORASSIGN:
c963b151 6377 case OP_DORASSIGN:
1a67a97c
SM		 6378 case OP_COND_EXPR:
6379 case OP_RANGE:
3280af22 6380 o->op_seq = PL_op_seqmax++;
fd4d1407
IZ		 6381 while (cLOGOP->op_other->op_type == OP_NULL)
6382 cLOGOP->op_other = cLOGOP->op_other->op_next;
a2efc822 6383 peep(cLOGOP->op_other); /* Recursive calls are not replaced by fptr calls */
79072805
LW		 6384 break;
6385
79072805 6386 case OP_ENTERLOOP:
9c2ca71a 6387 case OP_ENTERITER:
3280af22 6388 o->op_seq = PL_op_seqmax++;
58cccf98
SM		 6389 while (cLOOP->op_redoop->op_type == OP_NULL)
6390 cLOOP->op_redoop = cLOOP->op_redoop->op_next;
79072805 6391 peep(cLOOP->op_redoop);
58cccf98
SM		 6392 while (cLOOP->op_nextop->op_type == OP_NULL)
6393 cLOOP->op_nextop = cLOOP->op_nextop->op_next;
79072805 6394 peep(cLOOP->op_nextop);
58cccf98
SM		 6395 while (cLOOP->op_lastop->op_type == OP_NULL)
6396 cLOOP->op_lastop = cLOOP->op_lastop->op_next;
79072805
LW		 6397 peep(cLOOP->op_lastop);
6398 break;
6399
8782bef2 6400 case OP_QR:
79072805
LW		 6401 case OP_MATCH:
6402 case OP_SUBST:
3280af22 6403 o->op_seq = PL_op_seqmax++;
9041c2e3 6404 while (cPMOP->op_pmreplstart &&
58cccf98
SM		 6405 cPMOP->op_pmreplstart->op_type == OP_NULL)
6406 cPMOP->op_pmreplstart = cPMOP->op_pmreplstart->op_next;
a0d0e21e 6407 peep(cPMOP->op_pmreplstart);
79072805
LW		 6408 break;
6409
a0d0e21e 6410 case OP_EXEC:
3280af22 6411 o->op_seq = PL_op_seqmax++;
1c846c1f 6412 if (ckWARN(WARN_SYNTAX) && o->op_next
599cee73 6413 && o->op_next->op_type == OP_NEXTSTATE) {
a0d0e21e 6414 if (o->op_next->op_sibling &&
20408e3c
GS		 6415 o->op_next->op_sibling->op_type != OP_EXIT &&
6416 o->op_next->op_sibling->op_type != OP_WARN &&
a0d0e21e 6417 o->op_next->op_sibling->op_type != OP_DIE) {
57843af0 6418 line_t oldline = CopLINE(PL_curcop);
a0d0e21e 6419
57843af0 6420 CopLINE_set(PL_curcop, CopLINE((COP*)o->op_next));
9014280d 6421 Perl_warner(aTHX_ packWARN(WARN_EXEC),
eeb6a2c9 6422 "Statement unlikely to be reached");
9014280d 6423 Perl_warner(aTHX_ packWARN(WARN_EXEC),
cc507455 6424 "\t(Maybe you meant system() when you said exec()?)\n");
57843af0 6425 CopLINE_set(PL_curcop, oldline);
a0d0e21e
LW		 6426 }
6427 }
6428 break;
b2ffa427 6429
c750a3ec 6430 case OP_HELEM: {
6d822dc4
MS		 6431 SV *lexname;
6432 SV **svp, *sv;
1c846c1f 6433 char *key = NULL;
c750a3ec 6434 STRLEN keylen;
b2ffa427 6435
9615e741 6436 o->op_seq = PL_op_seqmax++;
1c846c1f
NIS		 6437
6438 if (((BINOP*)o)->op_last->op_type != OP_CONST)
c750a3ec 6439 break;
1c846c1f
NIS		 6440
6441 /* Make the CONST have a shared SV */
6442 svp = cSVOPx_svp(((BINOP*)o)->op_last);
3049cdab 6443 if ((!SvFAKE(sv = *svp) || !SvREADONLY(sv)) && !IS_PADCONST(sv)) {
1c846c1f 6444 key = SvPV(sv, keylen);
25716404
GS		 6445 lexname = newSVpvn_share(key,
6446 SvUTF8(sv) ? -(I32)keylen : keylen,
6447 0);
1c846c1f
NIS		 6448 SvREFCNT_dec(sv);
6449 *svp = lexname;
6450 }
6d822dc4
MS		 6451 break;
6452 }
c750a3ec 6453
79072805 6454 default:
3280af22 6455 o->op_seq = PL_op_seqmax++;
79072805
LW		 6456 break;
6457 }
a0d0e21e 6458 oldop = o;
79072805 6459 }
a0d0e21e 6460 LEAVE;
79072805 6461}
beab0874 6462
19e8ce8e
AB		 6463
6464
6465char* Perl_custom_op_name(pTHX_ OP* o)
53e06cf0
SC		 6466{
6467 IV index = PTR2IV(o->op_ppaddr);
6468 SV* keysv;
6469 HE* he;
6470
6471 if (!PL_custom_op_names) /* This probably shouldn't happen */
6472 return PL_op_name[OP_CUSTOM];
6473
6474 keysv = sv_2mortal(newSViv(index));
6475
6476 he = hv_fetch_ent(PL_custom_op_names, keysv, 0, 0);
6477 if (!he)
6478 return PL_op_name[OP_CUSTOM]; /* Don't know who you are */
6479
6480 return SvPV_nolen(HeVAL(he));
6481}
6482
19e8ce8e 6483char* Perl_custom_op_desc(pTHX_ OP* o)
53e06cf0
SC		 6484{
6485 IV index = PTR2IV(o->op_ppaddr);
6486 SV* keysv;
6487 HE* he;
6488
6489 if (!PL_custom_op_descs)
6490 return PL_op_desc[OP_CUSTOM];
6491
6492 keysv = sv_2mortal(newSViv(index));
6493
6494 he = hv_fetch_ent(PL_custom_op_descs, keysv, 0, 0);
6495 if (!he)
6496 return PL_op_desc[OP_CUSTOM];
6497
6498 return SvPV_nolen(HeVAL(he));
6499}
19e8ce8e 6500
53e06cf0 6501
beab0874
JT		 6502#include "XSUB.h"
6503
6504/* Efficient sub that returns a constant scalar value. */
6505static void
acfe0abc 6506const_sv_xsub(pTHX_ CV* cv)
beab0874
JT		 6507{
6508 dXSARGS;
9cbac4c7
DM		 6509 if (items != 0) {
6510#if 0
6511 Perl_croak(aTHX_ "usage: %s::%s()",
6512 HvNAME(GvSTASH(CvGV(cv))), GvNAME(CvGV(cv)));
6513#endif
6514 }
9a049f1c 6515 EXTEND(sp, 1);
0768512c 6516 ST(0) = (SV*)XSANY.any_ptr;
beab0874
JT		 6517 XSRETURN(1);
6518}
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