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[perl5.git] / pp_hot.c
CommitLineData
a0d0e21e
LW
1/* pp_hot.c
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
a0d0e21e
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 *
9 */
10
11/*
12 * Then he heard Merry change the note, and up went the Horn-cry of Buckland,
13 * shaking the air.
14 *
15 * Awake! Awake! Fear, Fire, Foes! Awake!
16 * Fire, Foes! Awake!
17 */
18
19#include "EXTERN.h"
864dbfa3 20#define PERL_IN_PP_HOT_C
a0d0e21e
LW
21#include "perl.h"
22
23/* Hot code. */
24
25PP(pp_const)
26{
39644a26 27 dSP;
1d7c1841 28 XPUSHs(cSVOP_sv);
a0d0e21e
LW
29 RETURN;
30}
31
32PP(pp_nextstate)
33{
533c011a 34 PL_curcop = (COP*)PL_op;
a0d0e21e 35 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 36 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e
LW
37 FREETMPS;
38 return NORMAL;
39}
40
41PP(pp_gvsv)
42{
39644a26 43 dSP;
924508f0 44 EXTEND(SP,1);
533c011a 45 if (PL_op->op_private & OPpLVAL_INTRO)
1d7c1841 46 PUSHs(save_scalar(cGVOP_gv));
a0d0e21e 47 else
1d7c1841 48 PUSHs(GvSV(cGVOP_gv));
a0d0e21e
LW
49 RETURN;
50}
51
52PP(pp_null)
53{
54 return NORMAL;
55}
56
7399586d
HS
57PP(pp_setstate)
58{
59 PL_curcop = (COP*)PL_op;
60 return NORMAL;
61}
62
a0d0e21e
LW
63PP(pp_pushmark)
64{
3280af22 65 PUSHMARK(PL_stack_sp);
a0d0e21e
LW
66 return NORMAL;
67}
68
69PP(pp_stringify)
70{
39644a26 71 dSP; dTARGET;
6050d10e 72 sv_copypv(TARG,TOPs);
a0d0e21e
LW
73 SETTARG;
74 RETURN;
75}
76
77PP(pp_gv)
78{
39644a26 79 dSP;
1d7c1841 80 XPUSHs((SV*)cGVOP_gv);
a0d0e21e
LW
81 RETURN;
82}
83
84PP(pp_and)
85{
39644a26 86 dSP;
a0d0e21e
LW
87 if (!SvTRUE(TOPs))
88 RETURN;
89 else {
90 --SP;
91 RETURNOP(cLOGOP->op_other);
92 }
93}
94
95PP(pp_sassign)
96{
39644a26 97 dSP; dPOPTOPssrl;
748a9306 98
533c011a 99 if (PL_op->op_private & OPpASSIGN_BACKWARDS) {
a0d0e21e
LW
100 SV *temp;
101 temp = left; left = right; right = temp;
102 }
3280af22 103 if (PL_tainting && PL_tainted && !SvTAINTED(left))
a0d0e21e 104 TAINT_NOT;
54310121 105 SvSetMagicSV(right, left);
a0d0e21e
LW
106 SETs(right);
107 RETURN;
108}
109
110PP(pp_cond_expr)
111{
39644a26 112 dSP;
a0d0e21e 113 if (SvTRUEx(POPs))
1a67a97c 114 RETURNOP(cLOGOP->op_other);
a0d0e21e 115 else
1a67a97c 116 RETURNOP(cLOGOP->op_next);
a0d0e21e
LW
117}
118
119PP(pp_unstack)
120{
121 I32 oldsave;
122 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 123 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e 124 FREETMPS;
3280af22 125 oldsave = PL_scopestack[PL_scopestack_ix - 1];
a0d0e21e
LW
126 LEAVE_SCOPE(oldsave);
127 return NORMAL;
128}
129
a0d0e21e
LW
130PP(pp_concat)
131{
39644a26 132 dSP; dATARGET; tryAMAGICbin(concat,opASSIGN);
748a9306
LW
133 {
134 dPOPTOPssrl;
8d6d96c1
HS
135 STRLEN llen;
136 char* lpv;
137 bool lbyte;
138 STRLEN rlen;
139 char* rpv = SvPV(right, rlen); /* mg_get(right) happens here */
db79b45b 140 bool rbyte = !SvUTF8(right), rcopied = FALSE;
8d6d96c1
HS
141
142 if (TARG == right && right != left) {
143 right = sv_2mortal(newSVpvn(rpv, rlen));
1e54db1a 144 rpv = SvPV(right, rlen); /* no point setting UTF-8 here */
db79b45b 145 rcopied = TRUE;
8d6d96c1 146 }
7889fe52 147
8d6d96c1
HS
148 if (TARG != left) {
149 lpv = SvPV(left, llen); /* mg_get(left) may happen here */
150 lbyte = !SvUTF8(left);
151 sv_setpvn(TARG, lpv, llen);
152 if (!lbyte)
153 SvUTF8_on(TARG);
154 else
155 SvUTF8_off(TARG);
156 }
157 else { /* TARG == left */
158 if (SvGMAGICAL(left))
159 mg_get(left); /* or mg_get(left) may happen here */
160 if (!SvOK(TARG))
161 sv_setpv(left, "");
162 lpv = SvPV_nomg(left, llen);
163 lbyte = !SvUTF8(left);
164 }
a12c0f56 165
fd15e783
PN
166#if defined(PERL_Y2KWARN)
167 if ((SvIOK(right) || SvNOK(right)) && ckWARN(WARN_Y2K) && SvOK(TARG)) {
8d6d96c1
HS
168 if (llen >= 2 && lpv[llen - 2] == '1' && lpv[llen - 1] == '9'
169 && (llen == 2 || !isDIGIT(lpv[llen - 3])))
170 {
9014280d 171 Perl_warner(aTHX_ packWARN(WARN_Y2K), "Possible Y2K bug: %s",
8d6d96c1
HS
172 "about to append an integer to '19'");
173 }
fd15e783
PN
174 }
175#endif
176
8d6d96c1
HS
177 if (lbyte != rbyte) {
178 if (lbyte)
179 sv_utf8_upgrade_nomg(TARG);
180 else {
db79b45b
JH
181 if (!rcopied)
182 right = sv_2mortal(newSVpvn(rpv, rlen));
8d6d96c1
HS
183 sv_utf8_upgrade_nomg(right);
184 rpv = SvPV(right, rlen);
69b47968 185 }
a0d0e21e 186 }
8d6d96c1 187 sv_catpvn_nomg(TARG, rpv, rlen);
43ebc500 188
a0d0e21e
LW
189 SETTARG;
190 RETURN;
748a9306 191 }
a0d0e21e
LW
192}
193
194PP(pp_padsv)
195{
39644a26 196 dSP; dTARGET;
a0d0e21e 197 XPUSHs(TARG);
533c011a
NIS
198 if (PL_op->op_flags & OPf_MOD) {
199 if (PL_op->op_private & OPpLVAL_INTRO)
dd2155a4 200 SAVECLEARSV(PAD_SVl(PL_op->op_targ));
533c011a 201 else if (PL_op->op_private & OPpDEREF) {
8ec5e241 202 PUTBACK;
dd2155a4 203 vivify_ref(PAD_SVl(PL_op->op_targ), PL_op->op_private & OPpDEREF);
8ec5e241
NIS
204 SPAGAIN;
205 }
4633a7c4 206 }
a0d0e21e
LW
207 RETURN;
208}
209
210PP(pp_readline)
211{
f5284f61 212 tryAMAGICunTARGET(iter, 0);
3280af22 213 PL_last_in_gv = (GV*)(*PL_stack_sp--);
8efb3254 214 if (SvTYPE(PL_last_in_gv) != SVt_PVGV) {
1c846c1f 215 if (SvROK(PL_last_in_gv) && SvTYPE(SvRV(PL_last_in_gv)) == SVt_PVGV)
f5284f61 216 PL_last_in_gv = (GV*)SvRV(PL_last_in_gv);
8efb3254 217 else {
f5284f61
IZ
218 dSP;
219 XPUSHs((SV*)PL_last_in_gv);
220 PUTBACK;
cea2e8a9 221 pp_rv2gv();
f5284f61 222 PL_last_in_gv = (GV*)(*PL_stack_sp--);
f5284f61
IZ
223 }
224 }
a0d0e21e
LW
225 return do_readline();
226}
227
228PP(pp_eq)
229{
39644a26 230 dSP; tryAMAGICbinSET(eq,0);
4c9fe80f
AS
231#ifndef NV_PRESERVES_UV
232 if (SvROK(TOPs) && SvROK(TOPm1s)) {
e61d22ef
NC
233 SP--;
234 SETs(boolSV(SvRV(TOPs) == SvRV(TOPp1s)));
4c9fe80f
AS
235 RETURN;
236 }
237#endif
28e5dec8
JH
238#ifdef PERL_PRESERVE_IVUV
239 SvIV_please(TOPs);
240 if (SvIOK(TOPs)) {
4c9fe80f
AS
241 /* Unless the left argument is integer in range we are going
242 to have to use NV maths. Hence only attempt to coerce the
243 right argument if we know the left is integer. */
28e5dec8
JH
244 SvIV_please(TOPm1s);
245 if (SvIOK(TOPm1s)) {
246 bool auvok = SvUOK(TOPm1s);
247 bool buvok = SvUOK(TOPs);
a12c0f56 248
1605159e
NC
249 if (auvok == buvok) { /* ## IV == IV or UV == UV ## */
250 /* Casting IV to UV before comparison isn't going to matter
251 on 2s complement. On 1s complement or sign&magnitude
252 (if we have any of them) it could to make negative zero
253 differ from normal zero. As I understand it. (Need to
254 check - is negative zero implementation defined behaviour
255 anyway?). NWC */
256 UV buv = SvUVX(POPs);
257 UV auv = SvUVX(TOPs);
28e5dec8 258
28e5dec8
JH
259 SETs(boolSV(auv == buv));
260 RETURN;
261 }
262 { /* ## Mixed IV,UV ## */
1605159e 263 SV *ivp, *uvp;
28e5dec8 264 IV iv;
28e5dec8 265
1605159e 266 /* == is commutative so doesn't matter which is left or right */
28e5dec8 267 if (auvok) {
1605159e
NC
268 /* top of stack (b) is the iv */
269 ivp = *SP;
270 uvp = *--SP;
271 } else {
272 uvp = *SP;
273 ivp = *--SP;
274 }
275 iv = SvIVX(ivp);
276 if (iv < 0) {
277 /* As uv is a UV, it's >0, so it cannot be == */
278 SETs(&PL_sv_no);
279 RETURN;
280 }
28e5dec8 281 /* we know iv is >= 0 */
1605159e 282 SETs(boolSV((UV)iv == SvUVX(uvp)));
28e5dec8
JH
283 RETURN;
284 }
285 }
286 }
287#endif
a0d0e21e
LW
288 {
289 dPOPnv;
54310121 290 SETs(boolSV(TOPn == value));
a0d0e21e
LW
291 RETURN;
292 }
293}
294
295PP(pp_preinc)
296{
39644a26 297 dSP;
3510b4a1 298 if (SvTYPE(TOPs) > SVt_PVLV)
d470f89e 299 DIE(aTHX_ PL_no_modify);
3510b4a1
NC
300 if (!SvREADONLY(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
301 && SvIVX(TOPs) != IV_MAX)
55497cff 302 {
748a9306 303 ++SvIVX(TOPs);
55497cff 304 SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
748a9306 305 }
28e5dec8 306 else /* Do all the PERL_PRESERVE_IVUV conditionals in sv_inc */
748a9306 307 sv_inc(TOPs);
a0d0e21e
LW
308 SvSETMAGIC(TOPs);
309 return NORMAL;
310}
311
312PP(pp_or)
313{
39644a26 314 dSP;
a0d0e21e
LW
315 if (SvTRUE(TOPs))
316 RETURN;
317 else {
318 --SP;
319 RETURNOP(cLOGOP->op_other);
320 }
321}
322
c963b151
BD
323PP(pp_dor)
324{
325 /* Most of this is lifted straight from pp_defined */
326 dSP;
327 register SV* sv;
328
329 sv = TOPs;
330 if (!sv || !SvANY(sv)) {
331 --SP;
332 RETURNOP(cLOGOP->op_other);
333 }
334
335 switch (SvTYPE(sv)) {
336 case SVt_PVAV:
337 if (AvMAX(sv) >= 0 || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
338 RETURN;
339 break;
340 case SVt_PVHV:
341 if (HvARRAY(sv) || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
342 RETURN;
343 break;
344 case SVt_PVCV:
345 if (CvROOT(sv) || CvXSUB(sv))
346 RETURN;
347 break;
348 default:
349 if (SvGMAGICAL(sv))
350 mg_get(sv);
351 if (SvOK(sv))
352 RETURN;
353 }
354
355 --SP;
356 RETURNOP(cLOGOP->op_other);
357}
358
a0d0e21e
LW
359PP(pp_add)
360{
39644a26 361 dSP; dATARGET; bool useleft; tryAMAGICbin(add,opASSIGN);
28e5dec8
JH
362 useleft = USE_LEFT(TOPm1s);
363#ifdef PERL_PRESERVE_IVUV
364 /* We must see if we can perform the addition with integers if possible,
365 as the integer code detects overflow while the NV code doesn't.
366 If either argument hasn't had a numeric conversion yet attempt to get
367 the IV. It's important to do this now, rather than just assuming that
368 it's not IOK as a PV of "9223372036854775806" may not take well to NV
369 addition, and an SV which is NOK, NV=6.0 ought to be coerced to
370 integer in case the second argument is IV=9223372036854775806
371 We can (now) rely on sv_2iv to do the right thing, only setting the
372 public IOK flag if the value in the NV (or PV) slot is truly integer.
373
374 A side effect is that this also aggressively prefers integer maths over
7dca457a
NC
375 fp maths for integer values.
376
a00b5bd3 377 How to detect overflow?
7dca457a
NC
378
379 C 99 section 6.2.6.1 says
380
381 The range of nonnegative values of a signed integer type is a subrange
382 of the corresponding unsigned integer type, and the representation of
383 the same value in each type is the same. A computation involving
384 unsigned operands can never overflow, because a result that cannot be
385 represented by the resulting unsigned integer type is reduced modulo
386 the number that is one greater than the largest value that can be
387 represented by the resulting type.
388
389 (the 9th paragraph)
390
391 which I read as "unsigned ints wrap."
392
393 signed integer overflow seems to be classed as "exception condition"
394
395 If an exceptional condition occurs during the evaluation of an
396 expression (that is, if the result is not mathematically defined or not
397 in the range of representable values for its type), the behavior is
398 undefined.
399
400 (6.5, the 5th paragraph)
401
402 I had assumed that on 2s complement machines signed arithmetic would
403 wrap, hence coded pp_add and pp_subtract on the assumption that
404 everything perl builds on would be happy. After much wailing and
405 gnashing of teeth it would seem that irix64 knows its ANSI spec well,
406 knows that it doesn't need to, and doesn't. Bah. Anyway, the all-
407 unsigned code below is actually shorter than the old code. :-)
408 */
409
28e5dec8
JH
410 SvIV_please(TOPs);
411 if (SvIOK(TOPs)) {
412 /* Unless the left argument is integer in range we are going to have to
413 use NV maths. Hence only attempt to coerce the right argument if
414 we know the left is integer. */
9c5ffd7c
JH
415 register UV auv = 0;
416 bool auvok = FALSE;
7dca457a
NC
417 bool a_valid = 0;
418
28e5dec8 419 if (!useleft) {
7dca457a
NC
420 auv = 0;
421 a_valid = auvok = 1;
422 /* left operand is undef, treat as zero. + 0 is identity,
423 Could SETi or SETu right now, but space optimise by not adding
424 lots of code to speed up what is probably a rarish case. */
425 } else {
426 /* Left operand is defined, so is it IV? */
427 SvIV_please(TOPm1s);
428 if (SvIOK(TOPm1s)) {
429 if ((auvok = SvUOK(TOPm1s)))
430 auv = SvUVX(TOPm1s);
431 else {
432 register IV aiv = SvIVX(TOPm1s);
433 if (aiv >= 0) {
434 auv = aiv;
435 auvok = 1; /* Now acting as a sign flag. */
436 } else { /* 2s complement assumption for IV_MIN */
437 auv = (UV)-aiv;
438 }
439 }
440 a_valid = 1;
28e5dec8
JH
441 }
442 }
7dca457a
NC
443 if (a_valid) {
444 bool result_good = 0;
445 UV result;
446 register UV buv;
28e5dec8 447 bool buvok = SvUOK(TOPs);
a00b5bd3 448
7dca457a
NC
449 if (buvok)
450 buv = SvUVX(TOPs);
451 else {
452 register IV biv = SvIVX(TOPs);
453 if (biv >= 0) {
454 buv = biv;
455 buvok = 1;
456 } else
457 buv = (UV)-biv;
458 }
459 /* ?uvok if value is >= 0. basically, flagged as UV if it's +ve,
602f51c4 460 else "IV" now, independent of how it came in.
7dca457a
NC
461 if a, b represents positive, A, B negative, a maps to -A etc
462 a + b => (a + b)
463 A + b => -(a - b)
464 a + B => (a - b)
465 A + B => -(a + b)
466 all UV maths. negate result if A negative.
467 add if signs same, subtract if signs differ. */
468
469 if (auvok ^ buvok) {
470 /* Signs differ. */
471 if (auv >= buv) {
472 result = auv - buv;
473 /* Must get smaller */
474 if (result <= auv)
475 result_good = 1;
476 } else {
477 result = buv - auv;
478 if (result <= buv) {
479 /* result really should be -(auv-buv). as its negation
480 of true value, need to swap our result flag */
481 auvok = !auvok;
482 result_good = 1;
28e5dec8
JH
483 }
484 }
7dca457a
NC
485 } else {
486 /* Signs same */
487 result = auv + buv;
488 if (result >= auv)
489 result_good = 1;
490 }
491 if (result_good) {
492 SP--;
493 if (auvok)
28e5dec8 494 SETu( result );
7dca457a
NC
495 else {
496 /* Negate result */
497 if (result <= (UV)IV_MIN)
498 SETi( -(IV)result );
499 else {
500 /* result valid, but out of range for IV. */
501 SETn( -(NV)result );
28e5dec8
JH
502 }
503 }
7dca457a
NC
504 RETURN;
505 } /* Overflow, drop through to NVs. */
28e5dec8
JH
506 }
507 }
508#endif
a0d0e21e 509 {
28e5dec8
JH
510 dPOPnv;
511 if (!useleft) {
512 /* left operand is undef, treat as zero. + 0.0 is identity. */
513 SETn(value);
514 RETURN;
515 }
516 SETn( value + TOPn );
517 RETURN;
a0d0e21e
LW
518 }
519}
520
521PP(pp_aelemfast)
522{
39644a26 523 dSP;
1d7c1841 524 AV *av = GvAV(cGVOP_gv);
533c011a
NIS
525 U32 lval = PL_op->op_flags & OPf_MOD;
526 SV** svp = av_fetch(av, PL_op->op_private, lval);
3280af22 527 SV *sv = (svp ? *svp : &PL_sv_undef);
6ff81951 528 EXTEND(SP, 1);
be6c24e0
GS
529 if (!lval && SvGMAGICAL(sv)) /* see note in pp_helem() */
530 sv = sv_mortalcopy(sv);
531 PUSHs(sv);
a0d0e21e
LW
532 RETURN;
533}
534
535PP(pp_join)
536{
39644a26 537 dSP; dMARK; dTARGET;
a0d0e21e
LW
538 MARK++;
539 do_join(TARG, *MARK, MARK, SP);
540 SP = MARK;
541 SETs(TARG);
542 RETURN;
543}
544
545PP(pp_pushre)
546{
39644a26 547 dSP;
44a8e56a
PP
548#ifdef DEBUGGING
549 /*
550 * We ass_u_me that LvTARGOFF() comes first, and that two STRLENs
551 * will be enough to hold an OP*.
552 */
553 SV* sv = sv_newmortal();
554 sv_upgrade(sv, SVt_PVLV);
555 LvTYPE(sv) = '/';
533c011a 556 Copy(&PL_op, &LvTARGOFF(sv), 1, OP*);
44a8e56a
PP
557 XPUSHs(sv);
558#else
6b88bc9c 559 XPUSHs((SV*)PL_op);
44a8e56a 560#endif
a0d0e21e
LW
561 RETURN;
562}
563
564/* Oversized hot code. */
565
566PP(pp_print)
567{
39644a26 568 dSP; dMARK; dORIGMARK;
a0d0e21e
LW
569 GV *gv;
570 IO *io;
760ac839 571 register PerlIO *fp;
236988e4 572 MAGIC *mg;
a0d0e21e 573
533c011a 574 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e
LW
575 gv = (GV*)*++MARK;
576 else
3280af22 577 gv = PL_defoutgv;
5b468f54
AMS
578
579 if (gv && (io = GvIO(gv))
580 && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar)))
581 {
01bb7c6d 582 had_magic:
68dc0745 583 if (MARK == ORIGMARK) {
1c846c1f 584 /* If using default handle then we need to make space to
a60c0954
NIS
585 * pass object as 1st arg, so move other args up ...
586 */
4352c267 587 MEXTEND(SP, 1);
68dc0745
PP
588 ++MARK;
589 Move(MARK, MARK + 1, (SP - MARK) + 1, SV*);
590 ++SP;
591 }
592 PUSHMARK(MARK - 1);
5b468f54 593 *MARK = SvTIED_obj((SV*)io, mg);
68dc0745 594 PUTBACK;
236988e4 595 ENTER;
864dbfa3 596 call_method("PRINT", G_SCALAR);
236988e4
PP
597 LEAVE;
598 SPAGAIN;
68dc0745
PP
599 MARK = ORIGMARK + 1;
600 *MARK = *SP;
601 SP = MARK;
236988e4
PP
602 RETURN;
603 }
a0d0e21e 604 if (!(io = GvIO(gv))) {
5b468f54
AMS
605 if ((GvEGV(gv)) && (io = GvIO(GvEGV(gv)))
606 && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar)))
01bb7c6d 607 goto had_magic;
2dd78f96
JH
608 if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
609 report_evil_fh(gv, io, PL_op->op_type);
93189314 610 SETERRNO(EBADF,RMS_IFI);
a0d0e21e
LW
611 goto just_say_no;
612 }
613 else if (!(fp = IoOFP(io))) {
599cee73 614 if (ckWARN2(WARN_CLOSED, WARN_IO)) {
4c80c0b2
NC
615 if (IoIFP(io))
616 report_evil_fh(gv, io, OP_phoney_INPUT_ONLY);
2dd78f96 617 else if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
bc37a18f 618 report_evil_fh(gv, io, PL_op->op_type);
a0d0e21e 619 }
93189314 620 SETERRNO(EBADF,IoIFP(io)?RMS_FAC:RMS_IFI);
a0d0e21e
LW
621 goto just_say_no;
622 }
623 else {
624 MARK++;
7889fe52 625 if (PL_ofs_sv && SvOK(PL_ofs_sv)) {
a0d0e21e
LW
626 while (MARK <= SP) {
627 if (!do_print(*MARK, fp))
628 break;
629 MARK++;
630 if (MARK <= SP) {
7889fe52 631 if (!do_print(PL_ofs_sv, fp)) { /* $, */
a0d0e21e
LW
632 MARK--;
633 break;
634 }
635 }
636 }
637 }
638 else {
639 while (MARK <= SP) {
640 if (!do_print(*MARK, fp))
641 break;
642 MARK++;
643 }
644 }
645 if (MARK <= SP)
646 goto just_say_no;
647 else {
7889fe52
NIS
648 if (PL_ors_sv && SvOK(PL_ors_sv))
649 if (!do_print(PL_ors_sv, fp)) /* $\ */
a0d0e21e
LW
650 goto just_say_no;
651
652 if (IoFLAGS(io) & IOf_FLUSH)
760ac839 653 if (PerlIO_flush(fp) == EOF)
a0d0e21e
LW
654 goto just_say_no;
655 }
656 }
657 SP = ORIGMARK;
3280af22 658 PUSHs(&PL_sv_yes);
a0d0e21e
LW
659 RETURN;
660
661 just_say_no:
662 SP = ORIGMARK;
3280af22 663 PUSHs(&PL_sv_undef);
a0d0e21e
LW
664 RETURN;
665}
666
667PP(pp_rv2av)
668{
39644a26 669 dSP; dTOPss;
a0d0e21e
LW
670 AV *av;
671
672 if (SvROK(sv)) {
673 wasref:
f5284f61
IZ
674 tryAMAGICunDEREF(to_av);
675
a0d0e21e
LW
676 av = (AV*)SvRV(sv);
677 if (SvTYPE(av) != SVt_PVAV)
cea2e8a9 678 DIE(aTHX_ "Not an ARRAY reference");
533c011a 679 if (PL_op->op_flags & OPf_REF) {
f5284f61 680 SETs((SV*)av);
a0d0e21e
LW
681 RETURN;
682 }
78f9721b
SM
683 else if (LVRET) {
684 if (GIMME == G_SCALAR)
685 Perl_croak(aTHX_ "Can't return array to lvalue scalar context");
686 SETs((SV*)av);
687 RETURN;
688 }
82d03984
RGS
689 else if (PL_op->op_flags & OPf_MOD
690 && PL_op->op_private & OPpLVAL_INTRO)
691 Perl_croak(aTHX_ PL_no_localize_ref);
a0d0e21e
LW
692 }
693 else {
694 if (SvTYPE(sv) == SVt_PVAV) {
695 av = (AV*)sv;
533c011a 696 if (PL_op->op_flags & OPf_REF) {
f5284f61 697 SETs((SV*)av);
a0d0e21e
LW
698 RETURN;
699 }
78f9721b
SM
700 else if (LVRET) {
701 if (GIMME == G_SCALAR)
702 Perl_croak(aTHX_ "Can't return array to lvalue"
703 " scalar context");
704 SETs((SV*)av);
705 RETURN;
706 }
a0d0e21e
LW
707 }
708 else {
67955e0c 709 GV *gv;
1c846c1f 710
a0d0e21e 711 if (SvTYPE(sv) != SVt_PVGV) {
748a9306 712 char *sym;
c9d5ac95 713 STRLEN len;
748a9306 714
a0d0e21e
LW
715 if (SvGMAGICAL(sv)) {
716 mg_get(sv);
717 if (SvROK(sv))
718 goto wasref;
719 }
720 if (!SvOK(sv)) {
533c011a
NIS
721 if (PL_op->op_flags & OPf_REF ||
722 PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 723 DIE(aTHX_ PL_no_usym, "an ARRAY");
599cee73 724 if (ckWARN(WARN_UNINITIALIZED))
1d7c1841 725 report_uninit();
f5284f61 726 if (GIMME == G_ARRAY) {
c2444246 727 (void)POPs;
4633a7c4 728 RETURN;
f5284f61
IZ
729 }
730 RETSETUNDEF;
a0d0e21e 731 }
c9d5ac95 732 sym = SvPV(sv,len);
35cd451c
GS
733 if ((PL_op->op_flags & OPf_SPECIAL) &&
734 !(PL_op->op_flags & OPf_MOD))
735 {
736 gv = (GV*)gv_fetchpv(sym, FALSE, SVt_PVAV);
c9d5ac95
GS
737 if (!gv
738 && (!is_gv_magical(sym,len,0)
739 || !(gv = (GV*)gv_fetchpv(sym, TRUE, SVt_PVAV))))
740 {
35cd451c 741 RETSETUNDEF;
c9d5ac95 742 }
35cd451c
GS
743 }
744 else {
745 if (PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 746 DIE(aTHX_ PL_no_symref, sym, "an ARRAY");
35cd451c
GS
747 gv = (GV*)gv_fetchpv(sym, TRUE, SVt_PVAV);
748 }
749 }
750 else {
67955e0c 751 gv = (GV*)sv;
a0d0e21e 752 }
67955e0c 753 av = GvAVn(gv);
533c011a 754 if (PL_op->op_private & OPpLVAL_INTRO)
67955e0c 755 av = save_ary(gv);
533c011a 756 if (PL_op->op_flags & OPf_REF) {
f5284f61 757 SETs((SV*)av);
a0d0e21e
LW
758 RETURN;
759 }
78f9721b
SM
760 else if (LVRET) {
761 if (GIMME == G_SCALAR)
762 Perl_croak(aTHX_ "Can't return array to lvalue"
763 " scalar context");
764 SETs((SV*)av);
765 RETURN;
766 }
a0d0e21e
LW
767 }
768 }
769
770 if (GIMME == G_ARRAY) {
771 I32 maxarg = AvFILL(av) + 1;
c2444246 772 (void)POPs; /* XXXX May be optimized away? */
1c846c1f 773 EXTEND(SP, maxarg);
93965878 774 if (SvRMAGICAL(av)) {
1c846c1f 775 U32 i;
eb160463 776 for (i=0; i < (U32)maxarg; i++) {
93965878 777 SV **svp = av_fetch(av, i, FALSE);
3280af22 778 SP[i+1] = (svp) ? *svp : &PL_sv_undef;
93965878 779 }
1c846c1f 780 }
93965878
NIS
781 else {
782 Copy(AvARRAY(av), SP+1, maxarg, SV*);
783 }
a0d0e21e
LW
784 SP += maxarg;
785 }
c754c3d7 786 else if (GIMME_V == G_SCALAR) {
a0d0e21e
LW
787 dTARGET;
788 I32 maxarg = AvFILL(av) + 1;
f5284f61 789 SETi(maxarg);
a0d0e21e
LW
790 }
791 RETURN;
792}
793
794PP(pp_rv2hv)
795{
39644a26 796 dSP; dTOPss;
a0d0e21e 797 HV *hv;
be85d344 798 I32 gimme = GIMME_V;
a0d0e21e
LW
799
800 if (SvROK(sv)) {
801 wasref:
f5284f61
IZ
802 tryAMAGICunDEREF(to_hv);
803
a0d0e21e 804 hv = (HV*)SvRV(sv);
6d822dc4 805 if (SvTYPE(hv) != SVt_PVHV)
cea2e8a9 806 DIE(aTHX_ "Not a HASH reference");
533c011a 807 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
808 SETs((SV*)hv);
809 RETURN;
810 }
78f9721b 811 else if (LVRET) {
be85d344 812 if (gimme != G_ARRAY)
78f9721b
SM
813 Perl_croak(aTHX_ "Can't return hash to lvalue scalar context");
814 SETs((SV*)hv);
815 RETURN;
816 }
82d03984
RGS
817 else if (PL_op->op_flags & OPf_MOD
818 && PL_op->op_private & OPpLVAL_INTRO)
819 Perl_croak(aTHX_ PL_no_localize_ref);
a0d0e21e
LW
820 }
821 else {
6d822dc4 822 if (SvTYPE(sv) == SVt_PVHV) {
a0d0e21e 823 hv = (HV*)sv;
533c011a 824 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
825 SETs((SV*)hv);
826 RETURN;
827 }
78f9721b 828 else if (LVRET) {
be85d344 829 if (gimme != G_ARRAY)
78f9721b
SM
830 Perl_croak(aTHX_ "Can't return hash to lvalue"
831 " scalar context");
832 SETs((SV*)hv);
833 RETURN;
834 }
a0d0e21e
LW
835 }
836 else {
67955e0c 837 GV *gv;
1c846c1f 838
a0d0e21e 839 if (SvTYPE(sv) != SVt_PVGV) {
748a9306 840 char *sym;
c9d5ac95 841 STRLEN len;
748a9306 842
a0d0e21e
LW
843 if (SvGMAGICAL(sv)) {
844 mg_get(sv);
845 if (SvROK(sv))
846 goto wasref;
847 }
848 if (!SvOK(sv)) {
533c011a
NIS
849 if (PL_op->op_flags & OPf_REF ||
850 PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 851 DIE(aTHX_ PL_no_usym, "a HASH");
599cee73 852 if (ckWARN(WARN_UNINITIALIZED))
1d7c1841 853 report_uninit();
be85d344 854 if (gimme == G_ARRAY) {
4633a7c4
LW
855 SP--;
856 RETURN;
857 }
a0d0e21e
LW
858 RETSETUNDEF;
859 }
c9d5ac95 860 sym = SvPV(sv,len);
35cd451c
GS
861 if ((PL_op->op_flags & OPf_SPECIAL) &&
862 !(PL_op->op_flags & OPf_MOD))
863 {
864 gv = (GV*)gv_fetchpv(sym, FALSE, SVt_PVHV);
c9d5ac95
GS
865 if (!gv
866 && (!is_gv_magical(sym,len,0)
867 || !(gv = (GV*)gv_fetchpv(sym, TRUE, SVt_PVHV))))
868 {
35cd451c 869 RETSETUNDEF;
c9d5ac95 870 }
35cd451c
GS
871 }
872 else {
873 if (PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 874 DIE(aTHX_ PL_no_symref, sym, "a HASH");
35cd451c
GS
875 gv = (GV*)gv_fetchpv(sym, TRUE, SVt_PVHV);
876 }
877 }
878 else {
67955e0c 879 gv = (GV*)sv;
a0d0e21e 880 }
67955e0c 881 hv = GvHVn(gv);
533c011a 882 if (PL_op->op_private & OPpLVAL_INTRO)
67955e0c 883 hv = save_hash(gv);
533c011a 884 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
885 SETs((SV*)hv);
886 RETURN;
887 }
78f9721b 888 else if (LVRET) {
be85d344 889 if (gimme != G_ARRAY)
78f9721b
SM
890 Perl_croak(aTHX_ "Can't return hash to lvalue"
891 " scalar context");
892 SETs((SV*)hv);
893 RETURN;
894 }
a0d0e21e
LW
895 }
896 }
897
be85d344 898 if (gimme == G_ARRAY) { /* array wanted */
3280af22 899 *PL_stack_sp = (SV*)hv;
cea2e8a9 900 return do_kv();
a0d0e21e 901 }
be85d344 902 else if (gimme == G_SCALAR) {
a0d0e21e 903 dTARGET;
243d6ab3 904 TARG = Perl_hv_scalar(aTHX_ hv);
a0d0e21e 905 SETTARG;
a0d0e21e 906 }
be85d344 907 RETURN;
a0d0e21e
LW
908}
909
10c8fecd
GS
910STATIC void
911S_do_oddball(pTHX_ HV *hash, SV **relem, SV **firstrelem)
912{
913 if (*relem) {
914 SV *tmpstr;
6d822dc4
MS
915 HE *didstore;
916
917 if (ckWARN(WARN_MISC)) {
10c8fecd
GS
918 if (relem == firstrelem &&
919 SvROK(*relem) &&
920 (SvTYPE(SvRV(*relem)) == SVt_PVAV ||
921 SvTYPE(SvRV(*relem)) == SVt_PVHV))
922 {
9014280d 923 Perl_warner(aTHX_ packWARN(WARN_MISC),
10c8fecd
GS
924 "Reference found where even-sized list expected");
925 }
926 else
9014280d 927 Perl_warner(aTHX_ packWARN(WARN_MISC),
10c8fecd
GS
928 "Odd number of elements in hash assignment");
929 }
6d822dc4
MS
930
931 tmpstr = NEWSV(29,0);
932 didstore = hv_store_ent(hash,*relem,tmpstr,0);
933 if (SvMAGICAL(hash)) {
934 if (SvSMAGICAL(tmpstr))
935 mg_set(tmpstr);
936 if (!didstore)
937 sv_2mortal(tmpstr);
938 }
939 TAINT_NOT;
10c8fecd
GS
940 }
941}
942
a0d0e21e
LW
943PP(pp_aassign)
944{
39644a26 945 dSP;
3280af22
NIS
946 SV **lastlelem = PL_stack_sp;
947 SV **lastrelem = PL_stack_base + POPMARK;
948 SV **firstrelem = PL_stack_base + POPMARK + 1;
a0d0e21e
LW
949 SV **firstlelem = lastrelem + 1;
950
951 register SV **relem;
952 register SV **lelem;
953
954 register SV *sv;
955 register AV *ary;
956
54310121 957 I32 gimme;
a0d0e21e
LW
958 HV *hash;
959 I32 i;
960 int magic;
ca65944e 961 int duplicates = 0;
5637b936
NC
962 SV **firsthashrelem = 0; /* "= 0" keeps gcc 2.95 quiet */
963
a0d0e21e 964
3280af22 965 PL_delaymagic = DM_DELAY; /* catch simultaneous items */
ca65944e 966 gimme = GIMME_V;
a0d0e21e
LW
967
968 /* If there's a common identifier on both sides we have to take
969 * special care that assigning the identifier on the left doesn't
970 * clobber a value on the right that's used later in the list.
971 */
10c8fecd 972 if (PL_op->op_private & (OPpASSIGN_COMMON)) {
cc5e57d2 973 EXTEND_MORTAL(lastrelem - firstrelem + 1);
10c8fecd
GS
974 for (relem = firstrelem; relem <= lastrelem; relem++) {
975 /*SUPPRESS 560*/
155aba94 976 if ((sv = *relem)) {
a1f49e72 977 TAINT_NOT; /* Each item is independent */
10c8fecd 978 *relem = sv_mortalcopy(sv);
a1f49e72 979 }
10c8fecd 980 }
a0d0e21e
LW
981 }
982
983 relem = firstrelem;
984 lelem = firstlelem;
985 ary = Null(AV*);
986 hash = Null(HV*);
10c8fecd 987
a0d0e21e 988 while (lelem <= lastlelem) {
bbce6d69 989 TAINT_NOT; /* Each item stands on its own, taintwise. */
a0d0e21e
LW
990 sv = *lelem++;
991 switch (SvTYPE(sv)) {
992 case SVt_PVAV:
993 ary = (AV*)sv;
748a9306 994 magic = SvMAGICAL(ary) != 0;
a0d0e21e 995 av_clear(ary);
7e42bd57 996 av_extend(ary, lastrelem - relem);
a0d0e21e
LW
997 i = 0;
998 while (relem <= lastrelem) { /* gobble up all the rest */
5117ca91 999 SV **didstore;
a0d0e21e
LW
1000 sv = NEWSV(28,0);
1001 assert(*relem);
1002 sv_setsv(sv,*relem);
1003 *(relem++) = sv;
5117ca91
GS
1004 didstore = av_store(ary,i++,sv);
1005 if (magic) {
fb73857a
PP
1006 if (SvSMAGICAL(sv))
1007 mg_set(sv);
5117ca91 1008 if (!didstore)
8127e0e3 1009 sv_2mortal(sv);
5117ca91 1010 }
bbce6d69 1011 TAINT_NOT;
a0d0e21e
LW
1012 }
1013 break;
10c8fecd 1014 case SVt_PVHV: { /* normal hash */
a0d0e21e
LW
1015 SV *tmpstr;
1016
1017 hash = (HV*)sv;
748a9306 1018 magic = SvMAGICAL(hash) != 0;
a0d0e21e 1019 hv_clear(hash);
ca65944e 1020 firsthashrelem = relem;
a0d0e21e
LW
1021
1022 while (relem < lastrelem) { /* gobble up all the rest */
5117ca91 1023 HE *didstore;
4633a7c4 1024 if (*relem)
a0d0e21e 1025 sv = *(relem++);
4633a7c4 1026 else
3280af22 1027 sv = &PL_sv_no, relem++;
a0d0e21e
LW
1028 tmpstr = NEWSV(29,0);
1029 if (*relem)
1030 sv_setsv(tmpstr,*relem); /* value */
1031 *(relem++) = tmpstr;
ca65944e
RGS
1032 if (gimme != G_VOID && hv_exists_ent(hash, sv, 0))
1033 /* key overwrites an existing entry */
1034 duplicates += 2;
5117ca91
GS
1035 didstore = hv_store_ent(hash,sv,tmpstr,0);
1036 if (magic) {
fb73857a
PP
1037 if (SvSMAGICAL(tmpstr))
1038 mg_set(tmpstr);
5117ca91 1039 if (!didstore)
8127e0e3 1040 sv_2mortal(tmpstr);
5117ca91 1041 }
bbce6d69 1042 TAINT_NOT;
8e07c86e 1043 }
6a0deba8 1044 if (relem == lastrelem) {
10c8fecd 1045 do_oddball(hash, relem, firstrelem);
6a0deba8 1046 relem++;
1930e939 1047 }
a0d0e21e
LW
1048 }
1049 break;
1050 default:
6fc92669
GS
1051 if (SvIMMORTAL(sv)) {
1052 if (relem <= lastrelem)
1053 relem++;
1054 break;
a0d0e21e
LW
1055 }
1056 if (relem <= lastrelem) {
1057 sv_setsv(sv, *relem);
1058 *(relem++) = sv;
1059 }
1060 else
3280af22 1061 sv_setsv(sv, &PL_sv_undef);
a0d0e21e
LW
1062 SvSETMAGIC(sv);
1063 break;
1064 }
1065 }
3280af22
NIS
1066 if (PL_delaymagic & ~DM_DELAY) {
1067 if (PL_delaymagic & DM_UID) {
a0d0e21e 1068#ifdef HAS_SETRESUID
fb934a90
RD
1069 (void)setresuid((PL_delaymagic & DM_RUID) ? PL_uid : (Uid_t)-1,
1070 (PL_delaymagic & DM_EUID) ? PL_euid : (Uid_t)-1,
1071 (Uid_t)-1);
56febc5e
AD
1072#else
1073# ifdef HAS_SETREUID
fb934a90
RD
1074 (void)setreuid((PL_delaymagic & DM_RUID) ? PL_uid : (Uid_t)-1,
1075 (PL_delaymagic & DM_EUID) ? PL_euid : (Uid_t)-1);
56febc5e
AD
1076# else
1077# ifdef HAS_SETRUID
b28d0864
NIS
1078 if ((PL_delaymagic & DM_UID) == DM_RUID) {
1079 (void)setruid(PL_uid);
1080 PL_delaymagic &= ~DM_RUID;
a0d0e21e 1081 }
56febc5e
AD
1082# endif /* HAS_SETRUID */
1083# ifdef HAS_SETEUID
b28d0864 1084 if ((PL_delaymagic & DM_UID) == DM_EUID) {
fb934a90 1085 (void)seteuid(PL_euid);
b28d0864 1086 PL_delaymagic &= ~DM_EUID;
a0d0e21e 1087 }
56febc5e 1088# endif /* HAS_SETEUID */
b28d0864
NIS
1089 if (PL_delaymagic & DM_UID) {
1090 if (PL_uid != PL_euid)
cea2e8a9 1091 DIE(aTHX_ "No setreuid available");
b28d0864 1092 (void)PerlProc_setuid(PL_uid);
a0d0e21e 1093 }
56febc5e
AD
1094# endif /* HAS_SETREUID */
1095#endif /* HAS_SETRESUID */
d8eceb89
JH
1096 PL_uid = PerlProc_getuid();
1097 PL_euid = PerlProc_geteuid();
a0d0e21e 1098 }
3280af22 1099 if (PL_delaymagic & DM_GID) {
a0d0e21e 1100#ifdef HAS_SETRESGID
fb934a90
RD
1101 (void)setresgid((PL_delaymagic & DM_RGID) ? PL_gid : (Gid_t)-1,
1102 (PL_delaymagic & DM_EGID) ? PL_egid : (Gid_t)-1,
1103 (Gid_t)-1);
56febc5e
AD
1104#else
1105# ifdef HAS_SETREGID
fb934a90
RD
1106 (void)setregid((PL_delaymagic & DM_RGID) ? PL_gid : (Gid_t)-1,
1107 (PL_delaymagic & DM_EGID) ? PL_egid : (Gid_t)-1);
56febc5e
AD
1108# else
1109# ifdef HAS_SETRGID
b28d0864
NIS
1110 if ((PL_delaymagic & DM_GID) == DM_RGID) {
1111 (void)setrgid(PL_gid);
1112 PL_delaymagic &= ~DM_RGID;
a0d0e21e 1113 }
56febc5e
AD
1114# endif /* HAS_SETRGID */
1115# ifdef HAS_SETEGID
b28d0864 1116 if ((PL_delaymagic & DM_GID) == DM_EGID) {
fb934a90 1117 (void)setegid(PL_egid);
b28d0864 1118 PL_delaymagic &= ~DM_EGID;
a0d0e21e 1119 }
56febc5e 1120# endif /* HAS_SETEGID */
b28d0864
NIS
1121 if (PL_delaymagic & DM_GID) {
1122 if (PL_gid != PL_egid)
cea2e8a9 1123 DIE(aTHX_ "No setregid available");
b28d0864 1124 (void)PerlProc_setgid(PL_gid);
a0d0e21e 1125 }
56febc5e
AD
1126# endif /* HAS_SETREGID */
1127#endif /* HAS_SETRESGID */
d8eceb89
JH
1128 PL_gid = PerlProc_getgid();
1129 PL_egid = PerlProc_getegid();
a0d0e21e 1130 }
3280af22 1131 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
a0d0e21e 1132 }
3280af22 1133 PL_delaymagic = 0;
54310121 1134
54310121
PP
1135 if (gimme == G_VOID)
1136 SP = firstrelem - 1;
1137 else if (gimme == G_SCALAR) {
1138 dTARGET;
1139 SP = firstrelem;
ca65944e 1140 SETi(lastrelem - firstrelem + 1 - duplicates);
54310121
PP
1141 }
1142 else {
ca65944e 1143 if (ary)
a0d0e21e 1144 SP = lastrelem;
ca65944e
RGS
1145 else if (hash) {
1146 if (duplicates) {
1147 /* Removes from the stack the entries which ended up as
1148 * duplicated keys in the hash (fix for [perl #24380]) */
1149 Move(firsthashrelem + duplicates,
1150 firsthashrelem, duplicates, SV**);
1151 lastrelem -= duplicates;
1152 }
1153 SP = lastrelem;
1154 }
a0d0e21e
LW
1155 else
1156 SP = firstrelem + (lastlelem - firstlelem);
0c8c7a05 1157 lelem = firstlelem + (relem - firstrelem);
5f05dabc 1158 while (relem <= SP)
3280af22 1159 *relem++ = (lelem <= lastlelem) ? *lelem++ : &PL_sv_undef;
a0d0e21e 1160 }
54310121 1161 RETURN;
a0d0e21e
LW
1162}
1163
8782bef2
GB
1164PP(pp_qr)
1165{
39644a26 1166 dSP;
8782bef2
GB
1167 register PMOP *pm = cPMOP;
1168 SV *rv = sv_newmortal();
57668c4d 1169 SV *sv = newSVrv(rv, "Regexp");
e08e52cf
AMS
1170 if (pm->op_pmdynflags & PMdf_TAINTED)
1171 SvTAINTED_on(rv);
aaa362c4 1172 sv_magic(sv,(SV*)ReREFCNT_inc(PM_GETRE(pm)), PERL_MAGIC_qr,0,0);
8782bef2
GB
1173 RETURNX(PUSHs(rv));
1174}
1175
a0d0e21e
LW
1176PP(pp_match)
1177{
39644a26 1178 dSP; dTARG;
a0d0e21e 1179 register PMOP *pm = cPMOP;
d65afb4b 1180 PMOP *dynpm = pm;
a0d0e21e
LW
1181 register char *t;
1182 register char *s;
1183 char *strend;
1184 I32 global;
f722798b
IZ
1185 I32 r_flags = REXEC_CHECKED;
1186 char *truebase; /* Start of string */
aaa362c4 1187 register REGEXP *rx = PM_GETRE(pm);
b3eb6a9b 1188 bool rxtainted;
a0d0e21e
LW
1189 I32 gimme = GIMME;
1190 STRLEN len;
748a9306 1191 I32 minmatch = 0;
3280af22 1192 I32 oldsave = PL_savestack_ix;
f86702cc 1193 I32 update_minmatch = 1;
e60df1fa 1194 I32 had_zerolen = 0;
a0d0e21e 1195
533c011a 1196 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 1197 TARG = POPs;
59f00321
RGS
1198 else if (PL_op->op_private & OPpTARGET_MY)
1199 GETTARGET;
a0d0e21e 1200 else {
54b9620d 1201 TARG = DEFSV;
a0d0e21e
LW
1202 EXTEND(SP,1);
1203 }
d9f424b2 1204
c277df42 1205 PUTBACK; /* EVAL blocks need stack_sp. */
a0d0e21e
LW
1206 s = SvPV(TARG, len);
1207 strend = s + len;
1208 if (!s)
2269b42e 1209 DIE(aTHX_ "panic: pp_match");
b3eb6a9b 1210 rxtainted = ((pm->op_pmdynflags & PMdf_TAINTED) ||
3280af22 1211 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
9212bbba 1212 TAINT_NOT;
a0d0e21e 1213
a30b2f1f 1214 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 1215
d65afb4b 1216 /* PMdf_USED is set after a ?? matches once */
48c036b1 1217 if (pm->op_pmdynflags & PMdf_USED) {
c277df42 1218 failure:
a0d0e21e
LW
1219 if (gimme == G_ARRAY)
1220 RETURN;
1221 RETPUSHNO;
1222 }
1223
d65afb4b 1224 /* empty pattern special-cased to use last successful pattern if possible */
3280af22
NIS
1225 if (!rx->prelen && PL_curpm) {
1226 pm = PL_curpm;
aaa362c4 1227 rx = PM_GETRE(pm);
a0d0e21e 1228 }
d65afb4b 1229
eb160463 1230 if (rx->minlen > (I32)len)
d65afb4b 1231 goto failure;
c277df42 1232
a0d0e21e 1233 truebase = t = s;
ad94a511
IZ
1234
1235 /* XXXX What part of this is needed with true \G-support? */
d65afb4b 1236 if ((global = dynpm->op_pmflags & PMf_GLOBAL)) {
cf93c79d 1237 rx->startp[0] = -1;
a0d0e21e 1238 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
14befaf4 1239 MAGIC* mg = mg_find(TARG, PERL_MAGIC_regex_global);
565764a8 1240 if (mg && mg->mg_len >= 0) {
b7a35066 1241 if (!(rx->reganch & ROPT_GPOS_SEEN))
1c846c1f 1242 rx->endp[0] = rx->startp[0] = mg->mg_len;
0ef3e39e
HS
1243 else if (rx->reganch & ROPT_ANCH_GPOS) {
1244 r_flags |= REXEC_IGNOREPOS;
1c846c1f 1245 rx->endp[0] = rx->startp[0] = mg->mg_len;
0ef3e39e 1246 }
748a9306 1247 minmatch = (mg->mg_flags & MGf_MINMATCH);
f86702cc 1248 update_minmatch = 0;
748a9306 1249 }
a0d0e21e
LW
1250 }
1251 }
14977893
JH
1252 if ((!global && rx->nparens)
1253 || SvTEMP(TARG) || PL_sawampersand)
1254 r_flags |= REXEC_COPY_STR;
1c846c1f 1255 if (SvSCREAM(TARG))
22e551b9
IZ
1256 r_flags |= REXEC_SCREAM;
1257
e8f49695 1258 if ((int)(pm->op_pmflags & PMf_MULTILINE) != PL_multiline) {
3280af22
NIS
1259 SAVEINT(PL_multiline);
1260 PL_multiline = pm->op_pmflags & PMf_MULTILINE;
a0d0e21e
LW
1261 }
1262
1263play_it_again:
cf93c79d
IZ
1264 if (global && rx->startp[0] != -1) {
1265 t = s = rx->endp[0] + truebase;
d9f97599 1266 if ((s + rx->minlen) > strend)
a0d0e21e 1267 goto nope;
f86702cc 1268 if (update_minmatch++)
e60df1fa 1269 minmatch = had_zerolen;
a0d0e21e 1270 }
60aeb6fd
NIS
1271 if (rx->reganch & RE_USE_INTUIT &&
1272 DO_UTF8(TARG) == ((rx->reganch & ROPT_UTF8) != 0)) {
ee0b7718 1273 PL_bostr = truebase;
f722798b
IZ
1274 s = CALLREG_INTUIT_START(aTHX_ rx, TARG, s, strend, r_flags, NULL);
1275
1276 if (!s)
1277 goto nope;
1278 if ( (rx->reganch & ROPT_CHECK_ALL)
14977893 1279 && !PL_sawampersand
f722798b
IZ
1280 && ((rx->reganch & ROPT_NOSCAN)
1281 || !((rx->reganch & RE_INTUIT_TAIL)
05b4157f
GS
1282 && (r_flags & REXEC_SCREAM)))
1283 && !SvROK(TARG)) /* Cannot trust since INTUIT cannot guess ^ */
f722798b 1284 goto yup;
a0d0e21e 1285 }
cea2e8a9 1286 if (CALLREGEXEC(aTHX_ rx, s, strend, truebase, minmatch, TARG, NULL, r_flags))
bbce6d69 1287 {
3280af22 1288 PL_curpm = pm;
d65afb4b
HS
1289 if (dynpm->op_pmflags & PMf_ONCE)
1290 dynpm->op_pmdynflags |= PMdf_USED;
a0d0e21e
LW
1291 goto gotcha;
1292 }
1293 else
1294 goto ret_no;
1295 /*NOTREACHED*/
1296
1297 gotcha:
72311751
GS
1298 if (rxtainted)
1299 RX_MATCH_TAINTED_on(rx);
1300 TAINT_IF(RX_MATCH_TAINTED(rx));
a0d0e21e 1301 if (gimme == G_ARRAY) {
ffc61ed2 1302 I32 nparens, i, len;
a0d0e21e 1303
ffc61ed2
JH
1304 nparens = rx->nparens;
1305 if (global && !nparens)
a0d0e21e
LW
1306 i = 1;
1307 else
1308 i = 0;
c277df42 1309 SPAGAIN; /* EVAL blocks could move the stack. */
ffc61ed2
JH
1310 EXTEND(SP, nparens + i);
1311 EXTEND_MORTAL(nparens + i);
1312 for (i = !i; i <= nparens; i++) {
a0d0e21e
LW
1313 PUSHs(sv_newmortal());
1314 /*SUPPRESS 560*/
cf93c79d
IZ
1315 if ((rx->startp[i] != -1) && rx->endp[i] != -1 ) {
1316 len = rx->endp[i] - rx->startp[i];
289555fe 1317 s = rx->startp[i] + truebase;
290deeac
A
1318 if (rx->endp[i] < 0 || rx->startp[i] < 0 ||
1319 len < 0 || len > strend - s)
1320 DIE(aTHX_ "panic: pp_match start/end pointers");
a0d0e21e 1321 sv_setpvn(*SP, s, len);
cce850e4 1322 if (DO_UTF8(TARG) && is_utf8_string((U8*)s, len))
a197cbdd 1323 SvUTF8_on(*SP);
a0d0e21e
LW
1324 }
1325 }
1326 if (global) {
d65afb4b 1327 if (dynpm->op_pmflags & PMf_CONTINUE) {
0af80b60
HS
1328 MAGIC* mg = 0;
1329 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
1330 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1331 if (!mg) {
1332 sv_magic(TARG, (SV*)0, PERL_MAGIC_regex_global, Nullch, 0);
1333 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1334 }
1335 if (rx->startp[0] != -1) {
1336 mg->mg_len = rx->endp[0];
1337 if (rx->startp[0] == rx->endp[0])
1338 mg->mg_flags |= MGf_MINMATCH;
1339 else
1340 mg->mg_flags &= ~MGf_MINMATCH;
1341 }
1342 }
cf93c79d
IZ
1343 had_zerolen = (rx->startp[0] != -1
1344 && rx->startp[0] == rx->endp[0]);
c277df42 1345 PUTBACK; /* EVAL blocks may use stack */
cf93c79d 1346 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
1347 goto play_it_again;
1348 }
ffc61ed2 1349 else if (!nparens)
bde848c5 1350 XPUSHs(&PL_sv_yes);
4633a7c4 1351 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1352 RETURN;
1353 }
1354 else {
1355 if (global) {
1356 MAGIC* mg = 0;
1357 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
14befaf4 1358 mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1359 if (!mg) {
14befaf4
DM
1360 sv_magic(TARG, (SV*)0, PERL_MAGIC_regex_global, Nullch, 0);
1361 mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1362 }
cf93c79d
IZ
1363 if (rx->startp[0] != -1) {
1364 mg->mg_len = rx->endp[0];
d9f97599 1365 if (rx->startp[0] == rx->endp[0])
748a9306
LW
1366 mg->mg_flags |= MGf_MINMATCH;
1367 else
1368 mg->mg_flags &= ~MGf_MINMATCH;
1369 }
a0d0e21e 1370 }
4633a7c4 1371 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1372 RETPUSHYES;
1373 }
1374
f722798b 1375yup: /* Confirmed by INTUIT */
72311751
GS
1376 if (rxtainted)
1377 RX_MATCH_TAINTED_on(rx);
1378 TAINT_IF(RX_MATCH_TAINTED(rx));
3280af22 1379 PL_curpm = pm;
d65afb4b
HS
1380 if (dynpm->op_pmflags & PMf_ONCE)
1381 dynpm->op_pmdynflags |= PMdf_USED;
cf93c79d
IZ
1382 if (RX_MATCH_COPIED(rx))
1383 Safefree(rx->subbeg);
1384 RX_MATCH_COPIED_off(rx);
1385 rx->subbeg = Nullch;
a0d0e21e 1386 if (global) {
d9f97599 1387 rx->subbeg = truebase;
cf93c79d 1388 rx->startp[0] = s - truebase;
a30b2f1f 1389 if (RX_MATCH_UTF8(rx)) {
60aeb6fd
NIS
1390 char *t = (char*)utf8_hop((U8*)s, rx->minlen);
1391 rx->endp[0] = t - truebase;
1392 }
1393 else {
1394 rx->endp[0] = s - truebase + rx->minlen;
1395 }
cf93c79d 1396 rx->sublen = strend - truebase;
a0d0e21e 1397 goto gotcha;
1c846c1f 1398 }
14977893
JH
1399 if (PL_sawampersand) {
1400 I32 off;
ed252734
NC
1401#ifdef PERL_COPY_ON_WRITE
1402 if (SvIsCOW(TARG) || (SvFLAGS(TARG) & CAN_COW_MASK) == CAN_COW_FLAGS) {
1403 if (DEBUG_C_TEST) {
1404 PerlIO_printf(Perl_debug_log,
1405 "Copy on write: pp_match $& capture, type %d, truebase=%p, t=%p, difference %d\n",
1406 (int) SvTYPE(TARG), truebase, t,
1407 (int)(t-truebase));
1408 }
1409 rx->saved_copy = sv_setsv_cow(rx->saved_copy, TARG);
1410 rx->subbeg = SvPVX(rx->saved_copy) + (t - truebase);
1411 assert (SvPOKp(rx->saved_copy));
1412 } else
1413#endif
1414 {
14977893 1415
ed252734
NC
1416 rx->subbeg = savepvn(t, strend - t);
1417#ifdef PERL_COPY_ON_WRITE
1418 rx->saved_copy = Nullsv;
1419#endif
1420 }
14977893
JH
1421 rx->sublen = strend - t;
1422 RX_MATCH_COPIED_on(rx);
1423 off = rx->startp[0] = s - t;
1424 rx->endp[0] = off + rx->minlen;
1425 }
1426 else { /* startp/endp are used by @- @+. */
1427 rx->startp[0] = s - truebase;
1428 rx->endp[0] = s - truebase + rx->minlen;
1429 }
2d862feb 1430 rx->nparens = rx->lastparen = rx->lastcloseparen = 0; /* used by @-, @+, and $^N */
4633a7c4 1431 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1432 RETPUSHYES;
1433
1434nope:
a0d0e21e 1435ret_no:
d65afb4b 1436 if (global && !(dynpm->op_pmflags & PMf_CONTINUE)) {
a0d0e21e 1437 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
14befaf4 1438 MAGIC* mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1439 if (mg)
565764a8 1440 mg->mg_len = -1;
a0d0e21e
LW
1441 }
1442 }
4633a7c4 1443 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1444 if (gimme == G_ARRAY)
1445 RETURN;
1446 RETPUSHNO;
1447}
1448
1449OP *
864dbfa3 1450Perl_do_readline(pTHX)
a0d0e21e
LW
1451{
1452 dSP; dTARGETSTACKED;
1453 register SV *sv;
1454 STRLEN tmplen = 0;
1455 STRLEN offset;
760ac839 1456 PerlIO *fp;
3280af22 1457 register IO *io = GvIO(PL_last_in_gv);
533c011a 1458 register I32 type = PL_op->op_type;
54310121 1459 I32 gimme = GIMME_V;
e79b0511 1460 MAGIC *mg;
a0d0e21e 1461
5b468f54 1462 if (io && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar))) {
e79b0511 1463 PUSHMARK(SP);
5b468f54 1464 XPUSHs(SvTIED_obj((SV*)io, mg));
e79b0511
PP
1465 PUTBACK;
1466 ENTER;
864dbfa3 1467 call_method("READLINE", gimme);
e79b0511
PP
1468 LEAVE;
1469 SPAGAIN;
0b7c7b4f
HS
1470 if (gimme == G_SCALAR) {
1471 SV* result = POPs;
1472 SvSetSV_nosteal(TARG, result);
1473 PUSHTARG;
1474 }
e79b0511
PP
1475 RETURN;
1476 }
a0d0e21e
LW
1477 fp = Nullfp;
1478 if (io) {
1479 fp = IoIFP(io);
1480 if (!fp) {
1481 if (IoFLAGS(io) & IOf_ARGV) {
1482 if (IoFLAGS(io) & IOf_START) {
a0d0e21e 1483 IoLINES(io) = 0;
3280af22 1484 if (av_len(GvAVn(PL_last_in_gv)) < 0) {
1d7c1841 1485 IoFLAGS(io) &= ~IOf_START;
9d116dd7 1486 do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,Nullfp);
3280af22
NIS
1487 sv_setpvn(GvSV(PL_last_in_gv), "-", 1);
1488 SvSETMAGIC(GvSV(PL_last_in_gv));
a2008d6d
GS
1489 fp = IoIFP(io);
1490 goto have_fp;
a0d0e21e
LW
1491 }
1492 }
3280af22 1493 fp = nextargv(PL_last_in_gv);
a0d0e21e 1494 if (!fp) { /* Note: fp != IoIFP(io) */
3280af22 1495 (void)do_close(PL_last_in_gv, FALSE); /* now it does*/
a0d0e21e
LW
1496 }
1497 }
0d44d22b
NC
1498 else if (type == OP_GLOB)
1499 fp = Perl_start_glob(aTHX_ POPs, io);
a0d0e21e
LW
1500 }
1501 else if (type == OP_GLOB)
1502 SP--;
a00b5bd3 1503 else if (ckWARN(WARN_IO) && IoTYPE(io) == IoTYPE_WRONLY) {
4c80c0b2 1504 report_evil_fh(PL_last_in_gv, io, OP_phoney_OUTPUT_ONLY);
a00b5bd3 1505 }
a0d0e21e
LW
1506 }
1507 if (!fp) {
790090df
HS
1508 if (ckWARN2(WARN_GLOB, WARN_CLOSED)
1509 && (!io || !(IoFLAGS(io) & IOf_START))) {
3f4520fe 1510 if (type == OP_GLOB)
9014280d 1511 Perl_warner(aTHX_ packWARN(WARN_GLOB),
af8c498a
GS
1512 "glob failed (can't start child: %s)",
1513 Strerror(errno));
69282e91 1514 else
bc37a18f 1515 report_evil_fh(PL_last_in_gv, io, PL_op->op_type);
3f4520fe 1516 }
54310121 1517 if (gimme == G_SCALAR) {
79628082 1518 /* undef TARG, and push that undefined value */
ba92458f
AE
1519 if (type != OP_RCATLINE) {
1520 SV_CHECK_THINKFIRST_COW_DROP(TARG);
929a4907 1521 (void)SvOK_off(TARG);
ba92458f 1522 }
a0d0e21e
LW
1523 PUSHTARG;
1524 }
1525 RETURN;
1526 }
a2008d6d 1527 have_fp:
54310121 1528 if (gimme == G_SCALAR) {
a0d0e21e 1529 sv = TARG;
9607fc9c
PP
1530 if (SvROK(sv))
1531 sv_unref(sv);
a0d0e21e
LW
1532 (void)SvUPGRADE(sv, SVt_PV);
1533 tmplen = SvLEN(sv); /* remember if already alloced */
bc44a8a2 1534 if (!tmplen && !SvREADONLY(sv))
a0d0e21e 1535 Sv_Grow(sv, 80); /* try short-buffering it */
2b5e58c4
AMS
1536 offset = 0;
1537 if (type == OP_RCATLINE && SvOK(sv)) {
1538 if (!SvPOK(sv)) {
1539 STRLEN n_a;
1540 (void)SvPV_force(sv, n_a);
1541 }
a0d0e21e 1542 offset = SvCUR(sv);
2b5e58c4 1543 }
a0d0e21e 1544 }
54310121
PP
1545 else {
1546 sv = sv_2mortal(NEWSV(57, 80));
1547 offset = 0;
1548 }
fbad3eb5 1549
3887d568
AP
1550 /* This should not be marked tainted if the fp is marked clean */
1551#define MAYBE_TAINT_LINE(io, sv) \
1552 if (!(IoFLAGS(io) & IOf_UNTAINT)) { \
1553 TAINT; \
1554 SvTAINTED_on(sv); \
1555 }
1556
684bef36 1557/* delay EOF state for a snarfed empty file */
fbad3eb5 1558#define SNARF_EOF(gimme,rs,io,sv) \
684bef36 1559 (gimme != G_SCALAR || SvCUR(sv) \
b9fee9ba 1560 || (IoFLAGS(io) & IOf_NOLINE) || !RsSNARF(rs))
fbad3eb5 1561
a0d0e21e 1562 for (;;) {
09e8efcc 1563 PUTBACK;
fbad3eb5 1564 if (!sv_gets(sv, fp, offset)
2d726892
TF
1565 && (type == OP_GLOB
1566 || SNARF_EOF(gimme, PL_rs, io, sv)
1567 || PerlIO_error(fp)))
fbad3eb5 1568 {
760ac839 1569 PerlIO_clearerr(fp);
a0d0e21e 1570 if (IoFLAGS(io) & IOf_ARGV) {
3280af22 1571 fp = nextargv(PL_last_in_gv);
a0d0e21e
LW
1572 if (fp)
1573 continue;
3280af22 1574 (void)do_close(PL_last_in_gv, FALSE);
a0d0e21e
LW
1575 }
1576 else if (type == OP_GLOB) {
e476b1b5 1577 if (!do_close(PL_last_in_gv, FALSE) && ckWARN(WARN_GLOB)) {
9014280d 1578 Perl_warner(aTHX_ packWARN(WARN_GLOB),
4eb79ab5 1579 "glob failed (child exited with status %d%s)",
894356b3 1580 (int)(STATUS_CURRENT >> 8),
cf494569 1581 (STATUS_CURRENT & 0x80) ? ", core dumped" : "");
4eb79ab5 1582 }
a0d0e21e 1583 }
54310121 1584 if (gimme == G_SCALAR) {
ba92458f
AE
1585 if (type != OP_RCATLINE) {
1586 SV_CHECK_THINKFIRST_COW_DROP(TARG);
929a4907 1587 (void)SvOK_off(TARG);
ba92458f 1588 }
09e8efcc 1589 SPAGAIN;
a0d0e21e
LW
1590 PUSHTARG;
1591 }
3887d568 1592 MAYBE_TAINT_LINE(io, sv);
a0d0e21e
LW
1593 RETURN;
1594 }
3887d568 1595 MAYBE_TAINT_LINE(io, sv);
a0d0e21e 1596 IoLINES(io)++;
b9fee9ba 1597 IoFLAGS(io) |= IOf_NOLINE;
71be2cbc 1598 SvSETMAGIC(sv);
09e8efcc 1599 SPAGAIN;
a0d0e21e 1600 XPUSHs(sv);
a0d0e21e
LW
1601 if (type == OP_GLOB) {
1602 char *tmps;
1603
3280af22 1604 if (SvCUR(sv) > 0 && SvCUR(PL_rs) > 0) {
c07a80fd 1605 tmps = SvEND(sv) - 1;
3280af22 1606 if (*tmps == *SvPVX(PL_rs)) {
c07a80fd
PP
1607 *tmps = '\0';
1608 SvCUR(sv)--;
1609 }
1610 }
a0d0e21e
LW
1611 for (tmps = SvPVX(sv); *tmps; tmps++)
1612 if (!isALPHA(*tmps) && !isDIGIT(*tmps) &&
1613 strchr("$&*(){}[]'\";\\|?<>~`", *tmps))
1614 break;
43384a1a 1615 if (*tmps && PerlLIO_lstat(SvPVX(sv), &PL_statbuf) < 0) {
a0d0e21e
LW
1616 (void)POPs; /* Unmatched wildcard? Chuck it... */
1617 continue;
1618 }
2d79bf7f
JH
1619 } else if (SvUTF8(sv)) { /* OP_READLINE, OP_RCATLINE */
1620 U8 *s = (U8*)SvPVX(sv) + offset;
1621 STRLEN len = SvCUR(sv) - offset;
1622 U8 *f;
1623
1624 if (ckWARN(WARN_UTF8) &&
1625 !Perl_is_utf8_string_loc(aTHX_ s, len, &f))
1626 /* Emulate :encoding(utf8) warning in the same case. */
1627 Perl_warner(aTHX_ packWARN(WARN_UTF8),
1628 "utf8 \"\\x%02X\" does not map to Unicode",
1629 f < (U8*)SvEND(sv) ? *f : 0);
a0d0e21e 1630 }
54310121 1631 if (gimme == G_ARRAY) {
a0d0e21e
LW
1632 if (SvLEN(sv) - SvCUR(sv) > 20) {
1633 SvLEN_set(sv, SvCUR(sv)+1);
1634 Renew(SvPVX(sv), SvLEN(sv), char);
1635 }
1636 sv = sv_2mortal(NEWSV(58, 80));
1637 continue;
1638 }
54310121 1639 else if (gimme == G_SCALAR && !tmplen && SvLEN(sv) - SvCUR(sv) > 80) {
a0d0e21e
LW
1640 /* try to reclaim a bit of scalar space (only on 1st alloc) */
1641 if (SvCUR(sv) < 60)
1642 SvLEN_set(sv, 80);
1643 else
1644 SvLEN_set(sv, SvCUR(sv)+40); /* allow some slop */
1645 Renew(SvPVX(sv), SvLEN(sv), char);
1646 }
1647 RETURN;
1648 }
1649}
1650
1651PP(pp_enter)
1652{
39644a26 1653 dSP;
c09156bb 1654 register PERL_CONTEXT *cx;
533c011a 1655 I32 gimme = OP_GIMME(PL_op, -1);
a0d0e21e 1656
54310121
PP
1657 if (gimme == -1) {
1658 if (cxstack_ix >= 0)
1659 gimme = cxstack[cxstack_ix].blk_gimme;
1660 else
1661 gimme = G_SCALAR;
1662 }
a0d0e21e
LW
1663
1664 ENTER;
1665
1666 SAVETMPS;
924508f0 1667 PUSHBLOCK(cx, CXt_BLOCK, SP);
a0d0e21e
LW
1668
1669 RETURN;
1670}
1671
1672PP(pp_helem)
1673{
39644a26 1674 dSP;
760ac839 1675 HE* he;
ae77835f 1676 SV **svp;
a0d0e21e 1677 SV *keysv = POPs;
a0d0e21e 1678 HV *hv = (HV*)POPs;
78f9721b 1679 U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
533c011a 1680 U32 defer = PL_op->op_private & OPpLVAL_DEFER;
be6c24e0 1681 SV *sv;
765f542d
NC
1682#ifdef PERL_COPY_ON_WRITE
1683 U32 hash = (SvIsCOW_shared_hash(keysv)) ? SvUVX(keysv) : 0;
1684#else
1c846c1f 1685 U32 hash = (SvFAKE(keysv) && SvREADONLY(keysv)) ? SvUVX(keysv) : 0;
765f542d 1686#endif
9c5ffd7c 1687 I32 preeminent = 0;
a0d0e21e 1688
ae77835f 1689 if (SvTYPE(hv) == SVt_PVHV) {
8d1f198f
DM
1690 if (PL_op->op_private & OPpLVAL_INTRO) {
1691 MAGIC *mg;
1692 HV *stash;
1693 /* does the element we're localizing already exist? */
c39e6ab0 1694 preeminent =
8d1f198f
DM
1695 /* can we determine whether it exists? */
1696 ( !SvRMAGICAL(hv)
1697 || mg_find((SV*)hv, PERL_MAGIC_env)
1698 || ( (mg = mg_find((SV*)hv, PERL_MAGIC_tied))
1699 /* Try to preserve the existenceness of a tied hash
1700 * element by using EXISTS and DELETE if possible.
1701 * Fallback to FETCH and STORE otherwise */
1702 && (stash = SvSTASH(SvRV(SvTIED_obj((SV*)hv, mg))))
1703 && gv_fetchmethod_autoload(stash, "EXISTS", TRUE)
1704 && gv_fetchmethod_autoload(stash, "DELETE", TRUE)
1705 )
1706 ) ? hv_exists_ent(hv, keysv, 0) : 1;
c39e6ab0 1707
8d1f198f 1708 }
1c846c1f 1709 he = hv_fetch_ent(hv, keysv, lval && !defer, hash);
97fcbf96 1710 svp = he ? &HeVAL(he) : 0;
ae77835f 1711 }
c750a3ec 1712 else {
a0d0e21e 1713 RETPUSHUNDEF;
c750a3ec 1714 }
a0d0e21e 1715 if (lval) {
3280af22 1716 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
1717 SV* lv;
1718 SV* key2;
2d8e6c8d
GS
1719 if (!defer) {
1720 STRLEN n_a;
cea2e8a9 1721 DIE(aTHX_ PL_no_helem, SvPV(keysv, n_a));
2d8e6c8d 1722 }
68dc0745
PP
1723 lv = sv_newmortal();
1724 sv_upgrade(lv, SVt_PVLV);
1725 LvTYPE(lv) = 'y';
14befaf4 1726 sv_magic(lv, key2 = newSVsv(keysv), PERL_MAGIC_defelem, Nullch, 0);
68dc0745
PP
1727 SvREFCNT_dec(key2); /* sv_magic() increments refcount */
1728 LvTARG(lv) = SvREFCNT_inc(hv);
1729 LvTARGLEN(lv) = 1;
1730 PUSHs(lv);
1731 RETURN;
1732 }
533c011a 1733 if (PL_op->op_private & OPpLVAL_INTRO) {
ae77835f 1734 if (HvNAME(hv) && isGV(*svp))
533c011a 1735 save_gp((GV*)*svp, !(PL_op->op_flags & OPf_SPECIAL));
1f5346dc
SC
1736 else {
1737 if (!preeminent) {
1738 STRLEN keylen;
1739 char *key = SvPV(keysv, keylen);
57813020 1740 SAVEDELETE(hv, savepvn(key,keylen), keylen);
bfc4de9f 1741 } else
1f5346dc
SC
1742 save_helem(hv, keysv, svp);
1743 }
5f05dabc 1744 }
533c011a
NIS
1745 else if (PL_op->op_private & OPpDEREF)
1746 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 1747 }
3280af22 1748 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
1749 /* This makes C<local $tied{foo} = $tied{foo}> possible.
1750 * Pushing the magical RHS on to the stack is useless, since
1751 * that magic is soon destined to be misled by the local(),
1752 * and thus the later pp_sassign() will fail to mg_get() the
1753 * old value. This should also cure problems with delayed
1754 * mg_get()s. GSAR 98-07-03 */
1755 if (!lval && SvGMAGICAL(sv))
1756 sv = sv_mortalcopy(sv);
1757 PUSHs(sv);
a0d0e21e
LW
1758 RETURN;
1759}
1760
1761PP(pp_leave)
1762{
39644a26 1763 dSP;
c09156bb 1764 register PERL_CONTEXT *cx;
a0d0e21e
LW
1765 register SV **mark;
1766 SV **newsp;
1767 PMOP *newpm;
1768 I32 gimme;
1769
533c011a 1770 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e 1771 cx = &cxstack[cxstack_ix];
3280af22 1772 cx->blk_oldpm = PL_curpm; /* fake block should preserve $1 et al */
a0d0e21e
LW
1773 }
1774
1775 POPBLOCK(cx,newpm);
1776
533c011a 1777 gimme = OP_GIMME(PL_op, -1);
54310121
PP
1778 if (gimme == -1) {
1779 if (cxstack_ix >= 0)
1780 gimme = cxstack[cxstack_ix].blk_gimme;
1781 else
1782 gimme = G_SCALAR;
1783 }
a0d0e21e 1784
a1f49e72 1785 TAINT_NOT;
54310121
PP
1786 if (gimme == G_VOID)
1787 SP = newsp;
1788 else if (gimme == G_SCALAR) {
1789 MARK = newsp + 1;
09256e2f 1790 if (MARK <= SP) {
54310121
PP
1791 if (SvFLAGS(TOPs) & (SVs_PADTMP|SVs_TEMP))
1792 *MARK = TOPs;
1793 else
1794 *MARK = sv_mortalcopy(TOPs);
09256e2f 1795 } else {
54310121 1796 MEXTEND(mark,0);
3280af22 1797 *MARK = &PL_sv_undef;
a0d0e21e 1798 }
54310121 1799 SP = MARK;
a0d0e21e 1800 }
54310121 1801 else if (gimme == G_ARRAY) {
a1f49e72
CS
1802 /* in case LEAVE wipes old return values */
1803 for (mark = newsp + 1; mark <= SP; mark++) {
1804 if (!(SvFLAGS(*mark) & (SVs_PADTMP|SVs_TEMP))) {
a0d0e21e 1805 *mark = sv_mortalcopy(*mark);
a1f49e72
CS
1806 TAINT_NOT; /* Each item is independent */
1807 }
1808 }
a0d0e21e 1809 }
3280af22 1810 PL_curpm = newpm; /* Don't pop $1 et al till now */
a0d0e21e
LW
1811
1812 LEAVE;
1813
1814 RETURN;
1815}
1816
1817PP(pp_iter)
1818{
39644a26 1819 dSP;
c09156bb 1820 register PERL_CONTEXT *cx;
5f05dabc 1821 SV* sv;
4633a7c4 1822 AV* av;
1d7c1841 1823 SV **itersvp;
a0d0e21e 1824
924508f0 1825 EXTEND(SP, 1);
a0d0e21e 1826 cx = &cxstack[cxstack_ix];
6b35e009 1827 if (CxTYPE(cx) != CXt_LOOP)
cea2e8a9 1828 DIE(aTHX_ "panic: pp_iter");
a0d0e21e 1829
1d7c1841 1830 itersvp = CxITERVAR(cx);
4633a7c4 1831 av = cx->blk_loop.iterary;
89ea2908
GA
1832 if (SvTYPE(av) != SVt_PVAV) {
1833 /* iterate ($min .. $max) */
1834 if (cx->blk_loop.iterlval) {
1835 /* string increment */
1836 register SV* cur = cx->blk_loop.iterlval;
1837 STRLEN maxlen;
1838 char *max = SvPV((SV*)av, maxlen);
1839 if (!SvNIOK(cur) && SvCUR(cur) <= maxlen) {
1d7c1841 1840 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1841 /* safe to reuse old SV */
1d7c1841 1842 sv_setsv(*itersvp, cur);
eaa5c2d6 1843 }
1c846c1f 1844 else
eaa5c2d6
GA
1845 {
1846 /* we need a fresh SV every time so that loop body sees a
1847 * completely new SV for closures/references to work as
1848 * they used to */
1d7c1841
GS
1849 SvREFCNT_dec(*itersvp);
1850 *itersvp = newSVsv(cur);
eaa5c2d6 1851 }
89ea2908
GA
1852 if (strEQ(SvPVX(cur), max))
1853 sv_setiv(cur, 0); /* terminate next time */
1854 else
1855 sv_inc(cur);
1856 RETPUSHYES;
1857 }
1858 RETPUSHNO;
1859 }
1860 /* integer increment */
1861 if (cx->blk_loop.iterix > cx->blk_loop.itermax)
1862 RETPUSHNO;
7f61b687 1863
3db8f154 1864 /* don't risk potential race */
1d7c1841 1865 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1866 /* safe to reuse old SV */
1d7c1841 1867 sv_setiv(*itersvp, cx->blk_loop.iterix++);
eaa5c2d6 1868 }
1c846c1f 1869 else
eaa5c2d6
GA
1870 {
1871 /* we need a fresh SV every time so that loop body sees a
1872 * completely new SV for closures/references to work as they
1873 * used to */
1d7c1841
GS
1874 SvREFCNT_dec(*itersvp);
1875 *itersvp = newSViv(cx->blk_loop.iterix++);
eaa5c2d6 1876 }
89ea2908
GA
1877 RETPUSHYES;
1878 }
1879
1880 /* iterate array */
3280af22 1881 if (cx->blk_loop.iterix >= (av == PL_curstack ? cx->blk_oldsp : AvFILL(av)))
4633a7c4 1882 RETPUSHNO;
a0d0e21e 1883
1d7c1841 1884 SvREFCNT_dec(*itersvp);
a0d0e21e 1885
d42935ef
JH
1886 if (SvMAGICAL(av) || AvREIFY(av)) {
1887 SV **svp = av_fetch(av, ++cx->blk_loop.iterix, FALSE);
1888 if (svp)
1889 sv = *svp;
1890 else
1891 sv = Nullsv;
1892 }
1893 else {
1894 sv = AvARRAY(av)[++cx->blk_loop.iterix];
1895 }
cccede53
DM
1896 if (sv && SvREFCNT(sv) == 0) {
1897 *itersvp = Nullsv;
b6c83531 1898 Perl_croak(aTHX_ "Use of freed value in iteration");
cccede53
DM
1899 }
1900
d42935ef 1901 if (sv)
a0d0e21e 1902 SvTEMP_off(sv);
a0d0e21e 1903 else
3280af22 1904 sv = &PL_sv_undef;
8b530633 1905 if (av != PL_curstack && sv == &PL_sv_undef) {
5f05dabc 1906 SV *lv = cx->blk_loop.iterlval;
71be2cbc
PP
1907 if (lv && SvREFCNT(lv) > 1) {
1908 SvREFCNT_dec(lv);
1909 lv = Nullsv;
1910 }
5f05dabc
PP
1911 if (lv)
1912 SvREFCNT_dec(LvTARG(lv));
1913 else {
68dc0745 1914 lv = cx->blk_loop.iterlval = NEWSV(26, 0);
5f05dabc 1915 sv_upgrade(lv, SVt_PVLV);
5f05dabc 1916 LvTYPE(lv) = 'y';
14befaf4 1917 sv_magic(lv, Nullsv, PERL_MAGIC_defelem, Nullch, 0);
5f05dabc
PP
1918 }
1919 LvTARG(lv) = SvREFCNT_inc(av);
1920 LvTARGOFF(lv) = cx->blk_loop.iterix;
42718184 1921 LvTARGLEN(lv) = (STRLEN)UV_MAX;
5f05dabc
PP
1922 sv = (SV*)lv;
1923 }
a0d0e21e 1924
1d7c1841 1925 *itersvp = SvREFCNT_inc(sv);
a0d0e21e
LW
1926 RETPUSHYES;
1927}
1928
1929PP(pp_subst)
1930{
39644a26 1931 dSP; dTARG;
a0d0e21e
LW
1932 register PMOP *pm = cPMOP;
1933 PMOP *rpm = pm;
1934 register SV *dstr;
1935 register char *s;
1936 char *strend;
1937 register char *m;
1938 char *c;
1939 register char *d;
1940 STRLEN clen;
1941 I32 iters = 0;
1942 I32 maxiters;
1943 register I32 i;
1944 bool once;
71be2cbc 1945 bool rxtainted;
a0d0e21e 1946 char *orig;
22e551b9 1947 I32 r_flags;
aaa362c4 1948 register REGEXP *rx = PM_GETRE(pm);
a0d0e21e
LW
1949 STRLEN len;
1950 int force_on_match = 0;
3280af22 1951 I32 oldsave = PL_savestack_ix;
792b2c16 1952 STRLEN slen;
f272994b 1953 bool doutf8 = FALSE;
ed252734
NC
1954#ifdef PERL_COPY_ON_WRITE
1955 bool is_cow;
1956#endif
db79b45b 1957 SV *nsv = Nullsv;
a0d0e21e 1958
5cd24f17
PP
1959 /* known replacement string? */
1960 dstr = (pm->op_pmflags & PMf_CONST) ? POPs : Nullsv;
533c011a 1961 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 1962 TARG = POPs;
59f00321
RGS
1963 else if (PL_op->op_private & OPpTARGET_MY)
1964 GETTARGET;
a0d0e21e 1965 else {
54b9620d 1966 TARG = DEFSV;
a0d0e21e 1967 EXTEND(SP,1);
1c846c1f 1968 }
d9f424b2 1969
ed252734
NC
1970#ifdef PERL_COPY_ON_WRITE
1971 /* Awooga. Awooga. "bool" types that are actually char are dangerous,
1972 because they make integers such as 256 "false". */
1973 is_cow = SvIsCOW(TARG) ? TRUE : FALSE;
1974#else
765f542d
NC
1975 if (SvIsCOW(TARG))
1976 sv_force_normal_flags(TARG,0);
ed252734
NC
1977#endif
1978 if (
1979#ifdef PERL_COPY_ON_WRITE
1980 !is_cow &&
1981#endif
1982 (SvREADONLY(TARG)
68dc0745 1983 || (SvTYPE(TARG) > SVt_PVLV
ed252734 1984 && !(SvTYPE(TARG) == SVt_PVGV && SvFAKE(TARG)))))
d470f89e 1985 DIE(aTHX_ PL_no_modify);
8ec5e241
NIS
1986 PUTBACK;
1987
a0d0e21e 1988 s = SvPV(TARG, len);
68dc0745 1989 if (!SvPOKp(TARG) || SvTYPE(TARG) == SVt_PVGV)
a0d0e21e 1990 force_on_match = 1;
b3eb6a9b 1991 rxtainted = ((pm->op_pmdynflags & PMdf_TAINTED) ||
3280af22
NIS
1992 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
1993 if (PL_tainted)
b3eb6a9b 1994 rxtainted |= 2;
9212bbba 1995 TAINT_NOT;
a12c0f56 1996
a30b2f1f 1997 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 1998
a0d0e21e
LW
1999 force_it:
2000 if (!pm || !s)
2269b42e 2001 DIE(aTHX_ "panic: pp_subst");
a0d0e21e
LW
2002
2003 strend = s + len;
a30b2f1f 2004 slen = RX_MATCH_UTF8(rx) ? utf8_length((U8*)s, (U8*)strend) : len;
792b2c16
JH
2005 maxiters = 2 * slen + 10; /* We can match twice at each
2006 position, once with zero-length,
2007 second time with non-zero. */
a0d0e21e 2008
3280af22
NIS
2009 if (!rx->prelen && PL_curpm) {
2010 pm = PL_curpm;
aaa362c4 2011 rx = PM_GETRE(pm);
a0d0e21e 2012 }
22e551b9 2013 r_flags = (rx->nparens || SvTEMP(TARG) || PL_sawampersand)
ed252734 2014 ? REXEC_COPY_STR : 0;
f722798b 2015 if (SvSCREAM(TARG))
22e551b9 2016 r_flags |= REXEC_SCREAM;
e8f49695 2017 if ((int)(pm->op_pmflags & PMf_MULTILINE) != PL_multiline) {
3280af22
NIS
2018 SAVEINT(PL_multiline);
2019 PL_multiline = pm->op_pmflags & PMf_MULTILINE;
a0d0e21e
LW
2020 }
2021 orig = m = s;
f722798b 2022 if (rx->reganch & RE_USE_INTUIT) {
ee0b7718 2023 PL_bostr = orig;
f722798b
IZ
2024 s = CALLREG_INTUIT_START(aTHX_ rx, TARG, s, strend, r_flags, NULL);
2025
2026 if (!s)
2027 goto nope;
2028 /* How to do it in subst? */
2029/* if ( (rx->reganch & ROPT_CHECK_ALL)
1c846c1f 2030 && !PL_sawampersand
f722798b
IZ
2031 && ((rx->reganch & ROPT_NOSCAN)
2032 || !((rx->reganch & RE_INTUIT_TAIL)
2033 && (r_flags & REXEC_SCREAM))))
2034 goto yup;
2035*/
a0d0e21e 2036 }
71be2cbc
PP
2037
2038 /* only replace once? */
a0d0e21e 2039 once = !(rpm->op_pmflags & PMf_GLOBAL);
71be2cbc
PP
2040
2041 /* known replacement string? */
f272994b 2042 if (dstr) {
8514a05a
JH
2043 /* replacement needing upgrading? */
2044 if (DO_UTF8(TARG) && !doutf8) {
db79b45b 2045 nsv = sv_newmortal();
4a176938 2046 SvSetSV(nsv, dstr);
8514a05a
JH
2047 if (PL_encoding)
2048 sv_recode_to_utf8(nsv, PL_encoding);
2049 else
2050 sv_utf8_upgrade(nsv);
2051 c = SvPV(nsv, clen);
4a176938
JH
2052 doutf8 = TRUE;
2053 }
2054 else {
2055 c = SvPV(dstr, clen);
2056 doutf8 = DO_UTF8(dstr);
8514a05a 2057 }
f272994b
A
2058 }
2059 else {
2060 c = Nullch;
2061 doutf8 = FALSE;
2062 }
2063
71be2cbc 2064 /* can do inplace substitution? */
ed252734
NC
2065 if (c
2066#ifdef PERL_COPY_ON_WRITE
2067 && !is_cow
2068#endif
2069 && (I32)clen <= rx->minlen && (once || !(r_flags & REXEC_COPY_STR))
db79b45b
JH
2070 && !(rx->reganch & ROPT_LOOKBEHIND_SEEN)
2071 && (!doutf8 || SvUTF8(TARG))) {
f722798b
IZ
2072 if (!CALLREGEXEC(aTHX_ rx, s, strend, orig, 0, TARG, NULL,
2073 r_flags | REXEC_CHECKED))
2074 {
8ec5e241 2075 SPAGAIN;
3280af22 2076 PUSHs(&PL_sv_no);
71be2cbc
PP
2077 LEAVE_SCOPE(oldsave);
2078 RETURN;
2079 }
ed252734
NC
2080#ifdef PERL_COPY_ON_WRITE
2081 if (SvIsCOW(TARG)) {
2082 assert (!force_on_match);
2083 goto have_a_cow;
2084 }
2085#endif
71be2cbc
PP
2086 if (force_on_match) {
2087 force_on_match = 0;
2088 s = SvPV_force(TARG, len);
2089 goto force_it;
2090 }
71be2cbc 2091 d = s;
3280af22 2092 PL_curpm = pm;
71be2cbc
PP
2093 SvSCREAM_off(TARG); /* disable possible screamer */
2094 if (once) {
48c036b1 2095 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d
IZ
2096 m = orig + rx->startp[0];
2097 d = orig + rx->endp[0];
71be2cbc
PP
2098 s = orig;
2099 if (m - s > strend - d) { /* faster to shorten from end */
2100 if (clen) {
2101 Copy(c, m, clen, char);
2102 m += clen;
a0d0e21e 2103 }
71be2cbc
PP
2104 i = strend - d;
2105 if (i > 0) {
2106 Move(d, m, i, char);
2107 m += i;
a0d0e21e 2108 }
71be2cbc
PP
2109 *m = '\0';
2110 SvCUR_set(TARG, m - s);
2111 }
2112 /*SUPPRESS 560*/
155aba94 2113 else if ((i = m - s)) { /* faster from front */
71be2cbc
PP
2114 d -= clen;
2115 m = d;
2116 sv_chop(TARG, d-i);
2117 s += i;
2118 while (i--)
2119 *--d = *--s;
2120 if (clen)
2121 Copy(c, m, clen, char);
2122 }
2123 else if (clen) {
2124 d -= clen;
2125 sv_chop(TARG, d);
2126 Copy(c, d, clen, char);
2127 }
2128 else {
2129 sv_chop(TARG, d);
2130 }
48c036b1 2131 TAINT_IF(rxtainted & 1);
8ec5e241 2132 SPAGAIN;
3280af22 2133 PUSHs(&PL_sv_yes);
71be2cbc
PP
2134 }
2135 else {
71be2cbc
PP
2136 do {
2137 if (iters++ > maxiters)
cea2e8a9 2138 DIE(aTHX_ "Substitution loop");
d9f97599 2139 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d 2140 m = rx->startp[0] + orig;
71be2cbc 2141 /*SUPPRESS 560*/
155aba94 2142 if ((i = m - s)) {
71be2cbc
PP
2143 if (s != d)
2144 Move(s, d, i, char);
2145 d += i;
a0d0e21e 2146 }
71be2cbc
PP
2147 if (clen) {
2148 Copy(c, d, clen, char);
2149 d += clen;
2150 }
cf93c79d 2151 s = rx->endp[0] + orig;
cea2e8a9 2152 } while (CALLREGEXEC(aTHX_ rx, s, strend, orig, s == m,
f722798b
IZ
2153 TARG, NULL,
2154 /* don't match same null twice */
2155 REXEC_NOT_FIRST|REXEC_IGNOREPOS));
71be2cbc
PP
2156 if (s != d) {
2157 i = strend - s;
2158 SvCUR_set(TARG, d - SvPVX(TARG) + i);
2159 Move(s, d, i+1, char); /* include the NUL */
a0d0e21e 2160 }
48c036b1 2161 TAINT_IF(rxtainted & 1);
8ec5e241 2162 SPAGAIN;
71be2cbc 2163 PUSHs(sv_2mortal(newSViv((I32)iters)));
a0d0e21e 2164 }
80b498e0 2165 (void)SvPOK_only_UTF8(TARG);
48c036b1 2166 TAINT_IF(rxtainted);
8ec5e241
NIS
2167 if (SvSMAGICAL(TARG)) {
2168 PUTBACK;
2169 mg_set(TARG);
2170 SPAGAIN;
2171 }
9212bbba 2172 SvTAINT(TARG);
aefe6dfc
JH
2173 if (doutf8)
2174 SvUTF8_on(TARG);
71be2cbc
PP
2175 LEAVE_SCOPE(oldsave);
2176 RETURN;
a0d0e21e 2177 }
71be2cbc 2178
f722798b
IZ
2179 if (CALLREGEXEC(aTHX_ rx, s, strend, orig, 0, TARG, NULL,
2180 r_flags | REXEC_CHECKED))
2181 {
a0d0e21e
LW
2182 if (force_on_match) {
2183 force_on_match = 0;
2184 s = SvPV_force(TARG, len);
2185 goto force_it;
2186 }
ed252734
NC
2187#ifdef PERL_COPY_ON_WRITE
2188 have_a_cow:
2189#endif
48c036b1 2190 rxtainted |= RX_MATCH_TAINTED(rx);
8ec5e241 2191 dstr = NEWSV(25, len);
a0d0e21e 2192 sv_setpvn(dstr, m, s-m);
ffc61ed2
JH
2193 if (DO_UTF8(TARG))
2194 SvUTF8_on(dstr);
3280af22 2195 PL_curpm = pm;
a0d0e21e 2196 if (!c) {
c09156bb 2197 register PERL_CONTEXT *cx;
8ec5e241 2198 SPAGAIN;
d8f2cf8a 2199 ReREFCNT_inc(rx);
a0d0e21e
LW
2200 PUSHSUBST(cx);
2201 RETURNOP(cPMOP->op_pmreplroot);
2202 }
cf93c79d 2203 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
2204 do {
2205 if (iters++ > maxiters)
cea2e8a9 2206 DIE(aTHX_ "Substitution loop");
d9f97599 2207 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d 2208 if (RX_MATCH_COPIED(rx) && rx->subbeg != orig) {
a0d0e21e
LW
2209 m = s;
2210 s = orig;
cf93c79d 2211 orig = rx->subbeg;
a0d0e21e
LW
2212 s = orig + (m - s);
2213 strend = s + (strend - m);
2214 }
cf93c79d 2215 m = rx->startp[0] + orig;
db79b45b
JH
2216 if (doutf8 && !SvUTF8(dstr))
2217 sv_catpvn_utf8_upgrade(dstr, s, m - s, nsv);
2218 else
2219 sv_catpvn(dstr, s, m-s);
cf93c79d 2220 s = rx->endp[0] + orig;
a0d0e21e
LW
2221 if (clen)
2222 sv_catpvn(dstr, c, clen);
2223 if (once)
2224 break;
ffc61ed2
JH
2225 } while (CALLREGEXEC(aTHX_ rx, s, strend, orig, s == m,
2226 TARG, NULL, r_flags));
db79b45b
JH
2227 if (doutf8 && !DO_UTF8(TARG))
2228 sv_catpvn_utf8_upgrade(dstr, s, strend - s, nsv);
89afcb60
A
2229 else
2230 sv_catpvn(dstr, s, strend - s);
748a9306 2231
ed252734
NC
2232#ifdef PERL_COPY_ON_WRITE
2233 /* The match may make the string COW. If so, brilliant, because that's
2234 just saved us one malloc, copy and free - the regexp has donated
2235 the old buffer, and we malloc an entirely new one, rather than the
2236 regexp malloc()ing a buffer and copying our original, only for
2237 us to throw it away here during the substitution. */
2238 if (SvIsCOW(TARG)) {
2239 sv_force_normal_flags(TARG, SV_COW_DROP_PV);
2240 } else
2241#endif
2242 {
2243 (void)SvOOK_off(TARG);
2244 if (SvLEN(TARG))
2245 Safefree(SvPVX(TARG));
2246 }
748a9306
LW
2247 SvPVX(TARG) = SvPVX(dstr);
2248 SvCUR_set(TARG, SvCUR(dstr));
2249 SvLEN_set(TARG, SvLEN(dstr));
f272994b 2250 doutf8 |= DO_UTF8(dstr);
748a9306
LW
2251 SvPVX(dstr) = 0;
2252 sv_free(dstr);
2253
48c036b1 2254 TAINT_IF(rxtainted & 1);
f878fbec 2255 SPAGAIN;
48c036b1
GS
2256 PUSHs(sv_2mortal(newSViv((I32)iters)));
2257
a0d0e21e 2258 (void)SvPOK_only(TARG);
f272994b 2259 if (doutf8)
60aeb6fd 2260 SvUTF8_on(TARG);
48c036b1 2261 TAINT_IF(rxtainted);
a0d0e21e 2262 SvSETMAGIC(TARG);
9212bbba 2263 SvTAINT(TARG);
4633a7c4 2264 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2265 RETURN;
2266 }
5cd24f17 2267 goto ret_no;
a0d0e21e
LW
2268
2269nope:
1c846c1f 2270ret_no:
8ec5e241 2271 SPAGAIN;
3280af22 2272 PUSHs(&PL_sv_no);
4633a7c4 2273 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2274 RETURN;
2275}
2276
2277PP(pp_grepwhile)
2278{
39644a26 2279 dSP;
a0d0e21e
LW
2280
2281 if (SvTRUEx(POPs))
3280af22
NIS
2282 PL_stack_base[PL_markstack_ptr[-1]++] = PL_stack_base[*PL_markstack_ptr];
2283 ++*PL_markstack_ptr;
a0d0e21e
LW
2284 LEAVE; /* exit inner scope */
2285
2286 /* All done yet? */
3280af22 2287 if (PL_stack_base + *PL_markstack_ptr > SP) {
a0d0e21e 2288 I32 items;
54310121 2289 I32 gimme = GIMME_V;
a0d0e21e
LW
2290
2291 LEAVE; /* exit outer scope */
2292 (void)POPMARK; /* pop src */
3280af22 2293 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 2294 (void)POPMARK; /* pop dst */
3280af22 2295 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 2296 if (gimme == G_SCALAR) {
a0d0e21e
LW
2297 dTARGET;
2298 XPUSHi(items);
a0d0e21e 2299 }
54310121
PP
2300 else if (gimme == G_ARRAY)
2301 SP += items;
a0d0e21e
LW
2302 RETURN;
2303 }
2304 else {
2305 SV *src;
2306
2307 ENTER; /* enter inner scope */
1d7c1841 2308 SAVEVPTR(PL_curpm);
a0d0e21e 2309
3280af22 2310 src = PL_stack_base[*PL_markstack_ptr];
a0d0e21e 2311 SvTEMP_off(src);
59f00321
RGS
2312 if (PL_op->op_private & OPpGREP_LEX)
2313 PAD_SVl(PL_op->op_targ) = src;
2314 else
2315 DEFSV = src;
a0d0e21e
LW
2316
2317 RETURNOP(cLOGOP->op_other);
2318 }
2319}
2320
2321PP(pp_leavesub)
2322{
39644a26 2323 dSP;
a0d0e21e
LW
2324 SV **mark;
2325 SV **newsp;
2326 PMOP *newpm;
2327 I32 gimme;
c09156bb 2328 register PERL_CONTEXT *cx;
b0d9ce38 2329 SV *sv;
a0d0e21e
LW
2330
2331 POPBLOCK(cx,newpm);
5dd42e15 2332 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2333
a1f49e72 2334 TAINT_NOT;
a0d0e21e
LW
2335 if (gimme == G_SCALAR) {
2336 MARK = newsp + 1;
a29cdaf0 2337 if (MARK <= SP) {
a8bba7fa 2338 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
a29cdaf0
IZ
2339 if (SvTEMP(TOPs)) {
2340 *MARK = SvREFCNT_inc(TOPs);
2341 FREETMPS;
2342 sv_2mortal(*MARK);
cd06dffe
GS
2343 }
2344 else {
959e3673 2345 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
a29cdaf0 2346 FREETMPS;
959e3673
GS
2347 *MARK = sv_mortalcopy(sv);
2348 SvREFCNT_dec(sv);
a29cdaf0 2349 }
cd06dffe
GS
2350 }
2351 else
a29cdaf0 2352 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
cd06dffe
GS
2353 }
2354 else {
f86702cc 2355 MEXTEND(MARK, 0);
3280af22 2356 *MARK = &PL_sv_undef;
a0d0e21e
LW
2357 }
2358 SP = MARK;
2359 }
54310121 2360 else if (gimme == G_ARRAY) {
f86702cc 2361 for (MARK = newsp + 1; MARK <= SP; MARK++) {
a1f49e72 2362 if (!SvTEMP(*MARK)) {
f86702cc 2363 *MARK = sv_mortalcopy(*MARK);
a1f49e72
CS
2364 TAINT_NOT; /* Each item is independent */
2365 }
f86702cc 2366 }
a0d0e21e 2367 }
f86702cc 2368 PUTBACK;
1c846c1f 2369
5dd42e15
DM
2370 LEAVE;
2371 cxstack_ix--;
b0d9ce38 2372 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
3280af22 2373 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e 2374
b0d9ce38 2375 LEAVESUB(sv);
a0d0e21e
LW
2376 return pop_return();
2377}
2378
cd06dffe
GS
2379/* This duplicates the above code because the above code must not
2380 * get any slower by more conditions */
2381PP(pp_leavesublv)
2382{
39644a26 2383 dSP;
cd06dffe
GS
2384 SV **mark;
2385 SV **newsp;
2386 PMOP *newpm;
2387 I32 gimme;
2388 register PERL_CONTEXT *cx;
b0d9ce38 2389 SV *sv;
cd06dffe
GS
2390
2391 POPBLOCK(cx,newpm);
5dd42e15 2392 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2393
cd06dffe
GS
2394 TAINT_NOT;
2395
2396 if (cx->blk_sub.lval & OPpENTERSUB_INARGS) {
2397 /* We are an argument to a function or grep().
2398 * This kind of lvalueness was legal before lvalue
2399 * subroutines too, so be backward compatible:
2400 * cannot report errors. */
2401
2402 /* Scalar context *is* possible, on the LHS of -> only,
2403 * as in f()->meth(). But this is not an lvalue. */
2404 if (gimme == G_SCALAR)
2405 goto temporise;
2406 if (gimme == G_ARRAY) {
a8bba7fa 2407 if (!CvLVALUE(cx->blk_sub.cv))
cd06dffe
GS
2408 goto temporise_array;
2409 EXTEND_MORTAL(SP - newsp);
2410 for (mark = newsp + 1; mark <= SP; mark++) {
2411 if (SvTEMP(*mark))
2412 /* empty */ ;
2413 else if (SvFLAGS(*mark) & (SVs_PADTMP | SVf_READONLY))
2414 *mark = sv_mortalcopy(*mark);
2415 else {
2416 /* Can be a localized value subject to deletion. */
2417 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2418 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2419 }
2420 }
2421 }
2422 }
2423 else if (cx->blk_sub.lval) { /* Leave it as it is if we can. */
2424 /* Here we go for robustness, not for speed, so we change all
2425 * the refcounts so the caller gets a live guy. Cannot set
2426 * TEMP, so sv_2mortal is out of question. */
a8bba7fa 2427 if (!CvLVALUE(cx->blk_sub.cv)) {
5dd42e15
DM
2428 LEAVE;
2429 cxstack_ix--;
b0d9ce38 2430 POPSUB(cx,sv);
d470f89e 2431 PL_curpm = newpm;
b0d9ce38 2432 LEAVESUB(sv);
d470f89e
GS
2433 DIE(aTHX_ "Can't modify non-lvalue subroutine call");
2434 }
cd06dffe
GS
2435 if (gimme == G_SCALAR) {
2436 MARK = newsp + 1;
2437 EXTEND_MORTAL(1);
2438 if (MARK == SP) {
d470f89e 2439 if (SvFLAGS(TOPs) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
5dd42e15
DM
2440 LEAVE;
2441 cxstack_ix--;
b0d9ce38 2442 POPSUB(cx,sv);
d470f89e 2443 PL_curpm = newpm;
b0d9ce38 2444 LEAVESUB(sv);
e9f19e3c
HS
2445 DIE(aTHX_ "Can't return %s from lvalue subroutine",
2446 SvREADONLY(TOPs) ? (TOPs == &PL_sv_undef) ? "undef"
2447 : "a readonly value" : "a temporary");
d470f89e 2448 }
cd06dffe
GS
2449 else { /* Can be a localized value
2450 * subject to deletion. */
2451 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2452 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2453 }
2454 }
d470f89e 2455 else { /* Should not happen? */
5dd42e15
DM
2456 LEAVE;
2457 cxstack_ix--;
b0d9ce38 2458 POPSUB(cx,sv);
d470f89e 2459 PL_curpm = newpm;
b0d9ce38 2460 LEAVESUB(sv);
d470f89e 2461 DIE(aTHX_ "%s returned from lvalue subroutine in scalar context",
cd06dffe 2462 (MARK > SP ? "Empty array" : "Array"));
d470f89e 2463 }
cd06dffe
GS
2464 SP = MARK;
2465 }
2466 else if (gimme == G_ARRAY) {
2467 EXTEND_MORTAL(SP - newsp);
2468 for (mark = newsp + 1; mark <= SP; mark++) {
f206cdda
AMS
2469 if (*mark != &PL_sv_undef
2470 && SvFLAGS(*mark) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
d470f89e
GS
2471 /* Might be flattened array after $#array = */
2472 PUTBACK;
5dd42e15
DM
2473 LEAVE;
2474 cxstack_ix--;
b0d9ce38 2475 POPSUB(cx,sv);
d470f89e 2476 PL_curpm = newpm;
b0d9ce38 2477 LEAVESUB(sv);
f206cdda
AMS
2478 DIE(aTHX_ "Can't return a %s from lvalue subroutine",
2479 SvREADONLY(TOPs) ? "readonly value" : "temporary");
d470f89e 2480 }
cd06dffe 2481 else {
cd06dffe
GS
2482 /* Can be a localized value subject to deletion. */
2483 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2484 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2485 }
2486 }
2487 }
2488 }
2489 else {
2490 if (gimme == G_SCALAR) {
2491 temporise:
2492 MARK = newsp + 1;
2493 if (MARK <= SP) {
a8bba7fa 2494 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
cd06dffe
GS
2495 if (SvTEMP(TOPs)) {
2496 *MARK = SvREFCNT_inc(TOPs);
2497 FREETMPS;
2498 sv_2mortal(*MARK);
2499 }
2500 else {
959e3673 2501 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
cd06dffe 2502 FREETMPS;
959e3673
GS
2503 *MARK = sv_mortalcopy(sv);
2504 SvREFCNT_dec(sv);
cd06dffe
GS
2505 }
2506 }
2507 else
2508 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
2509 }
2510 else {
2511 MEXTEND(MARK, 0);
2512 *MARK = &PL_sv_undef;
2513 }
2514 SP = MARK;
2515 }
2516 else if (gimme == G_ARRAY) {
2517 temporise_array:
2518 for (MARK = newsp + 1; MARK <= SP; MARK++) {
2519 if (!SvTEMP(*MARK)) {
2520 *MARK = sv_mortalcopy(*MARK);
2521 TAINT_NOT; /* Each item is independent */
2522 }
2523 }
2524 }
2525 }
2526 PUTBACK;
1c846c1f 2527
5dd42e15
DM
2528 LEAVE;
2529 cxstack_ix--;
b0d9ce38 2530 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
cd06dffe
GS
2531 PL_curpm = newpm; /* ... and pop $1 et al */
2532
b0d9ce38 2533 LEAVESUB(sv);
cd06dffe
GS
2534 return pop_return();
2535}
2536
2537
76e3520e 2538STATIC CV *
cea2e8a9 2539S_get_db_sub(pTHX_ SV **svp, CV *cv)
3de9ffa1 2540{
3280af22 2541 SV *dbsv = GvSV(PL_DBsub);
491527d0
GS
2542
2543 if (!PERLDB_SUB_NN) {
2544 GV *gv = CvGV(cv);
2545
2546 save_item(dbsv);
2547 if ( (CvFLAGS(cv) & (CVf_ANON | CVf_CLONED))
1c846c1f 2548 || strEQ(GvNAME(gv), "END")
491527d0
GS
2549 || ((GvCV(gv) != cv) && /* Could be imported, and old sub redefined. */
2550 !( (SvTYPE(*svp) == SVt_PVGV) && (GvCV((GV*)*svp) == cv)
2551 && (gv = (GV*)*svp) ))) {
2552 /* Use GV from the stack as a fallback. */
2553 /* GV is potentially non-unique, or contain different CV. */
c2e66d9e
GS
2554 SV *tmp = newRV((SV*)cv);
2555 sv_setsv(dbsv, tmp);
2556 SvREFCNT_dec(tmp);
491527d0
GS
2557 }
2558 else {
2559 gv_efullname3(dbsv, gv, Nullch);
2560 }
3de9ffa1
MB
2561 }
2562 else {
155aba94
GS
2563 (void)SvUPGRADE(dbsv, SVt_PVIV);
2564 (void)SvIOK_on(dbsv);
491527d0 2565 SAVEIV(SvIVX(dbsv));
5bc28da9 2566 SvIVX(dbsv) = PTR2IV(cv); /* Do it the quickest way */
3de9ffa1 2567 }
491527d0 2568
3de9ffa1 2569 if (CvXSUB(cv))
3280af22
NIS
2570 PL_curcopdb = PL_curcop;
2571 cv = GvCV(PL_DBsub);
3de9ffa1
MB
2572 return cv;
2573}
2574
a0d0e21e
LW
2575PP(pp_entersub)
2576{
39644a26 2577 dSP; dPOPss;
a0d0e21e
LW
2578 GV *gv;
2579 HV *stash;
2580 register CV *cv;
c09156bb 2581 register PERL_CONTEXT *cx;
5d94fbed 2582 I32 gimme;
533c011a 2583 bool hasargs = (PL_op->op_flags & OPf_STACKED) != 0;
a0d0e21e
LW
2584
2585 if (!sv)
cea2e8a9 2586 DIE(aTHX_ "Not a CODE reference");
a0d0e21e 2587 switch (SvTYPE(sv)) {
f1025168
NC
2588 /* This is overwhelming the most common case: */
2589 case SVt_PVGV:
2590 if (!(cv = GvCVu((GV*)sv)))
2591 cv = sv_2cv(sv, &stash, &gv, FALSE);
2592 if (!cv) {
2593 ENTER;
2594 SAVETMPS;
2595 goto try_autoload;
2596 }
2597 break;
a0d0e21e
LW
2598 default:
2599 if (!SvROK(sv)) {
748a9306 2600 char *sym;
2d8e6c8d 2601 STRLEN n_a;
748a9306 2602
3280af22 2603 if (sv == &PL_sv_yes) { /* unfound import, ignore */
fb73857a 2604 if (hasargs)
3280af22 2605 SP = PL_stack_base + POPMARK;
a0d0e21e 2606 RETURN;
fb73857a 2607 }
15ff848f
CS
2608 if (SvGMAGICAL(sv)) {
2609 mg_get(sv);
f5f1d18e
AMS
2610 if (SvROK(sv))
2611 goto got_rv;
15ff848f
CS
2612 sym = SvPOKp(sv) ? SvPVX(sv) : Nullch;
2613 }
2614 else
2d8e6c8d 2615 sym = SvPV(sv, n_a);
15ff848f 2616 if (!sym)
cea2e8a9 2617 DIE(aTHX_ PL_no_usym, "a subroutine");
533c011a 2618 if (PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 2619 DIE(aTHX_ PL_no_symref, sym, "a subroutine");
864dbfa3 2620 cv = get_cv(sym, TRUE);
a0d0e21e
LW
2621 break;
2622 }
f5f1d18e 2623 got_rv:
f5284f61
IZ
2624 {
2625 SV **sp = &sv; /* Used in tryAMAGICunDEREF macro. */
2626 tryAMAGICunDEREF(to_cv);
2627 }
a0d0e21e
LW
2628 cv = (CV*)SvRV(sv);
2629 if (SvTYPE(cv) == SVt_PVCV)
2630 break;
2631 /* FALL THROUGH */
2632 case SVt_PVHV:
2633 case SVt_PVAV:
cea2e8a9 2634 DIE(aTHX_ "Not a CODE reference");
f1025168 2635 /* This is the second most common case: */
a0d0e21e
LW
2636 case SVt_PVCV:
2637 cv = (CV*)sv;
2638 break;
a0d0e21e
LW
2639 }
2640
2641 ENTER;
2642 SAVETMPS;
2643
2644 retry:
a0d0e21e 2645 if (!CvROOT(cv) && !CvXSUB(cv)) {
f1025168 2646 goto fooey;
a0d0e21e
LW
2647 }
2648
54310121 2649 gimme = GIMME_V;
67caa1fe 2650 if ((PL_op->op_private & OPpENTERSUB_DB) && GvCV(PL_DBsub) && !CvNODEBUG(cv)) {
06492da6
SF
2651 if (CvASSERTION(cv) && PL_DBassertion)
2652 sv_setiv(PL_DBassertion, 1);
2653
4f01c5a5 2654 cv = get_db_sub(&sv, cv);
67caa1fe 2655 if (!cv)
cea2e8a9 2656 DIE(aTHX_ "No DBsub routine");
67caa1fe 2657 }
a0d0e21e 2658
f1025168
NC
2659 if (!(CvXSUB(cv))) {
2660 /* This path taken at least 75% of the time */
a0d0e21e
LW
2661 dMARK;
2662 register I32 items = SP - MARK;
a0d0e21e 2663 AV* padlist = CvPADLIST(cv);
533c011a 2664 push_return(PL_op->op_next);
a0d0e21e
LW
2665 PUSHBLOCK(cx, CXt_SUB, MARK);
2666 PUSHSUB(cx);
2667 CvDEPTH(cv)++;
6b35e009
GS
2668 /* XXX This would be a natural place to set C<PL_compcv = cv> so
2669 * that eval'' ops within this sub know the correct lexical space.
a3985cdc
DM
2670 * Owing the speed considerations, we choose instead to search for
2671 * the cv using find_runcv() when calling doeval().
6b35e009 2672 */
b36bdeca 2673 if (CvDEPTH(cv) >= 2) {
1d7c1841 2674 PERL_STACK_OVERFLOW_CHECK();
dd2155a4 2675 pad_push(padlist, CvDEPTH(cv), 1);
a0d0e21e 2676 }
dd2155a4 2677 PAD_SET_CUR(padlist, CvDEPTH(cv));
6d4ff0d2 2678 if (hasargs)
6d4ff0d2
MB
2679 {
2680 AV* av;
a0d0e21e
LW
2681 SV** ary;
2682
77a005ab 2683#if 0
bf49b057 2684 DEBUG_S(PerlIO_printf(Perl_debug_log,
0f15f207 2685 "%p entersub preparing @_\n", thr));
77a005ab 2686#endif
dd2155a4 2687 av = (AV*)PAD_SVl(0);
221373f0
GS
2688 if (AvREAL(av)) {
2689 /* @_ is normally not REAL--this should only ever
2690 * happen when DB::sub() calls things that modify @_ */
2691 av_clear(av);
2692 AvREAL_off(av);
2693 AvREIFY_on(av);
2694 }
3280af22
NIS
2695 cx->blk_sub.savearray = GvAV(PL_defgv);
2696 GvAV(PL_defgv) = (AV*)SvREFCNT_inc(av);
dd2155a4 2697 CX_CURPAD_SAVE(cx->blk_sub);
6d4ff0d2 2698 cx->blk_sub.argarray = av;
a0d0e21e
LW
2699 ++MARK;
2700
2701 if (items > AvMAX(av) + 1) {
2702 ary = AvALLOC(av);
2703 if (AvARRAY(av) != ary) {
2704 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
2705 SvPVX(av) = (char*)ary;
2706 }
2707 if (items > AvMAX(av) + 1) {
2708 AvMAX(av) = items - 1;
2709 Renew(ary,items,SV*);
2710 AvALLOC(av) = ary;
2711 SvPVX(av) = (char*)ary;
2712 }
2713 }
2714 Copy(MARK,AvARRAY(av),items,SV*);
93965878 2715 AvFILLp(av) = items - 1;
1c846c1f 2716
a0d0e21e
LW
2717 while (items--) {
2718 if (*MARK)
2719 SvTEMP_off(*MARK);
2720 MARK++;
2721 }
2722 }
4a925ff6
GS
2723 /* warning must come *after* we fully set up the context
2724 * stuff so that __WARN__ handlers can safely dounwind()
2725 * if they want to
2726 */
2727 if (CvDEPTH(cv) == 100 && ckWARN(WARN_RECURSION)
2728 && !(PERLDB_SUB && cv == GvCV(PL_DBsub)))
2729 sub_crush_depth(cv);
77a005ab 2730#if 0
bf49b057 2731 DEBUG_S(PerlIO_printf(Perl_debug_log,
0f15f207 2732 "%p entersub returning %p\n", thr, CvSTART(cv)));
77a005ab 2733#endif
a0d0e21e
LW
2734 RETURNOP(CvSTART(cv));
2735 }
f1025168
NC
2736 else {
2737#ifdef PERL_XSUB_OLDSTYLE
2738 if (CvOLDSTYLE(cv)) {
2739 I32 (*fp3)(int,int,int);
2740 dMARK;
2741 register I32 items = SP - MARK;
2742 /* We dont worry to copy from @_. */
2743 while (SP > mark) {
2744 SP[1] = SP[0];
2745 SP--;
2746 }
2747 PL_stack_sp = mark + 1;
2748 fp3 = (I32(*)(int,int,int))CvXSUB(cv);
2749 items = (*fp3)(CvXSUBANY(cv).any_i32,
2750 MARK - PL_stack_base + 1,
2751 items);
2752 PL_stack_sp = PL_stack_base + items;
2753 }
2754 else
2755#endif /* PERL_XSUB_OLDSTYLE */
2756 {
2757 I32 markix = TOPMARK;
2758
2759 PUTBACK;
2760
2761 if (!hasargs) {
2762 /* Need to copy @_ to stack. Alternative may be to
2763 * switch stack to @_, and copy return values
2764 * back. This would allow popping @_ in XSUB, e.g.. XXXX */
2765 AV* av;
2766 I32 items;
2767 av = GvAV(PL_defgv);
2768 items = AvFILLp(av) + 1; /* @_ is not tieable */
2769
2770 if (items) {
2771 /* Mark is at the end of the stack. */
2772 EXTEND(SP, items);
2773 Copy(AvARRAY(av), SP + 1, items, SV*);
2774 SP += items;
2775 PUTBACK ;
2776 }
2777 }
2778 /* We assume first XSUB in &DB::sub is the called one. */
2779 if (PL_curcopdb) {
2780 SAVEVPTR(PL_curcop);
2781 PL_curcop = PL_curcopdb;
2782 PL_curcopdb = NULL;
2783 }
2784 /* Do we need to open block here? XXXX */
2785 (void)(*CvXSUB(cv))(aTHX_ cv);
2786
2787 /* Enforce some sanity in scalar context. */
2788 if (gimme == G_SCALAR && ++markix != PL_stack_sp - PL_stack_base ) {
2789 if (markix > PL_stack_sp - PL_stack_base)
2790 *(PL_stack_base + markix) = &PL_sv_undef;
2791 else
2792 *(PL_stack_base + markix) = *PL_stack_sp;
2793 PL_stack_sp = PL_stack_base + markix;
2794 }
2795 }
2796 LEAVE;
2797 return NORMAL;
2798 }
2799
2800 assert (0); /* Cannot get here. */
2801 /* This is deliberately moved here as spaghetti code to keep it out of the
2802 hot path. */
2803 {
2804 GV* autogv;
2805 SV* sub_name;
2806
2807 fooey:
2808 /* anonymous or undef'd function leaves us no recourse */
2809 if (CvANON(cv) || !(gv = CvGV(cv)))
2810 DIE(aTHX_ "Undefined subroutine called");
2811
2812 /* autoloaded stub? */
2813 if (cv != GvCV(gv)) {
2814 cv = GvCV(gv);
2815 }
2816 /* should call AUTOLOAD now? */
2817 else {
2818try_autoload:
2819 if ((autogv = gv_autoload4(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv),
2820 FALSE)))
2821 {
2822 cv = GvCV(autogv);
2823 }
2824 /* sorry */
2825 else {
2826 sub_name = sv_newmortal();
2827 gv_efullname3(sub_name, gv, Nullch);
35c1215d 2828 DIE(aTHX_ "Undefined subroutine &%"SVf" called", sub_name);
f1025168
NC
2829 }
2830 }
2831 if (!cv)
2832 DIE(aTHX_ "Not a CODE reference");
2833 goto retry;
2834 }
a0d0e21e
LW
2835}
2836
44a8e56a 2837void
864dbfa3 2838Perl_sub_crush_depth(pTHX_ CV *cv)
44a8e56a
PP
2839{
2840 if (CvANON(cv))
9014280d 2841 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on anonymous subroutine");
44a8e56a
PP
2842 else {
2843 SV* tmpstr = sv_newmortal();
2844 gv_efullname3(tmpstr, CvGV(cv), Nullch);
35c1215d
NC
2845 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on subroutine \"%"SVf"\"",
2846 tmpstr);
44a8e56a
PP
2847 }
2848}
2849
a0d0e21e
LW
2850PP(pp_aelem)
2851{
39644a26 2852 dSP;
a0d0e21e 2853 SV** svp;
d804643f
SC
2854 SV* elemsv = POPs;
2855 IV elem = SvIV(elemsv);
68dc0745 2856 AV* av = (AV*)POPs;
78f9721b 2857 U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
533c011a 2858 U32 defer = (PL_op->op_private & OPpLVAL_DEFER) && (elem > AvFILL(av));
be6c24e0 2859 SV *sv;
a0d0e21e 2860
e35c1634 2861 if (SvROK(elemsv) && !SvGAMAGIC(elemsv) && ckWARN(WARN_MISC))
35c1215d 2862 Perl_warner(aTHX_ packWARN(WARN_MISC), "Use of reference \"%"SVf"\" as array index", elemsv);
748a9306 2863 if (elem > 0)
3280af22 2864 elem -= PL_curcop->cop_arybase;
a0d0e21e
LW
2865 if (SvTYPE(av) != SVt_PVAV)
2866 RETPUSHUNDEF;
68dc0745 2867 svp = av_fetch(av, elem, lval && !defer);
a0d0e21e 2868 if (lval) {
3280af22 2869 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
2870 SV* lv;
2871 if (!defer)
cea2e8a9 2872 DIE(aTHX_ PL_no_aelem, elem);
68dc0745
PP
2873 lv = sv_newmortal();
2874 sv_upgrade(lv, SVt_PVLV);
2875 LvTYPE(lv) = 'y';
14befaf4 2876 sv_magic(lv, Nullsv, PERL_MAGIC_defelem, Nullch, 0);
68dc0745
PP
2877 LvTARG(lv) = SvREFCNT_inc(av);
2878 LvTARGOFF(lv) = elem;
2879 LvTARGLEN(lv) = 1;
2880 PUSHs(lv);
2881 RETURN;
2882 }
bfc4de9f 2883 if (PL_op->op_private & OPpLVAL_INTRO)
161b7d16 2884 save_aelem(av, elem, svp);
533c011a
NIS
2885 else if (PL_op->op_private & OPpDEREF)
2886 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 2887 }
3280af22 2888 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
2889 if (!lval && SvGMAGICAL(sv)) /* see note in pp_helem() */
2890 sv = sv_mortalcopy(sv);
2891 PUSHs(sv);
a0d0e21e
LW
2892 RETURN;
2893}
2894
02a9e968 2895void
864dbfa3 2896Perl_vivify_ref(pTHX_ SV *sv, U32 to_what)
02a9e968
CS
2897{
2898 if (SvGMAGICAL(sv))
2899 mg_get(sv);
2900 if (!SvOK(sv)) {
2901 if (SvREADONLY(sv))
cea2e8a9 2902 Perl_croak(aTHX_ PL_no_modify);
5f05dabc
PP
2903 if (SvTYPE(sv) < SVt_RV)
2904 sv_upgrade(sv, SVt_RV);
2905 else if (SvTYPE(sv) >= SVt_PV) {
2906 (void)SvOOK_off(sv);
2907 Safefree(SvPVX(sv));
2908 SvLEN(sv) = SvCUR(sv) = 0;
2909 }
68dc0745 2910 switch (to_what) {
5f05dabc 2911 case OPpDEREF_SV:
8c52afec 2912 SvRV(sv) = NEWSV(355,0);
5f05dabc
PP
2913 break;
2914 case OPpDEREF_AV:
2915 SvRV(sv) = (SV*)newAV();
2916 break;
2917 case OPpDEREF_HV:
2918 SvRV(sv) = (SV*)newHV();
2919 break;
2920 }
02a9e968
CS
2921 SvROK_on(sv);
2922 SvSETMAGIC(sv);
2923 }
2924}
2925
a0d0e21e
LW
2926PP(pp_method)
2927{
39644a26 2928 dSP;
f5d5a27c
CS
2929 SV* sv = TOPs;
2930
2931 if (SvROK(sv)) {
eda383f2 2932 SV* rsv = SvRV(sv);
f5d5a27c
CS
2933 if (SvTYPE(rsv) == SVt_PVCV) {
2934 SETs(rsv);
2935 RETURN;
2936 }
2937 }
2938
2939 SETs(method_common(sv, Null(U32*)));
2940 RETURN;
2941}
2942
2943PP(pp_method_named)
2944{
39644a26 2945 dSP;
3848b962 2946 SV* sv = cSVOP_sv;
f5d5a27c
CS
2947 U32 hash = SvUVX(sv);
2948
2949 XPUSHs(method_common(sv, &hash));
2950 RETURN;
2951}
2952
2953STATIC SV *
2954S_method_common(pTHX_ SV* meth, U32* hashp)
2955{
a0d0e21e
LW
2956 SV* sv;
2957 SV* ob;
2958 GV* gv;
56304f61
CS
2959 HV* stash;
2960 char* name;
f5d5a27c 2961 STRLEN namelen;
9c5ffd7c 2962 char* packname = 0;
0dae17bd 2963 SV *packsv = Nullsv;
ac91690f 2964 STRLEN packlen;
a0d0e21e 2965
f5d5a27c 2966 name = SvPV(meth, namelen);
3280af22 2967 sv = *(PL_stack_base + TOPMARK + 1);
f5d5a27c 2968
4f1b7578
SC
2969 if (!sv)
2970 Perl_croak(aTHX_ "Can't call method \"%s\" on an undefined value", name);
2971
16d20bd9 2972 if (SvGMAGICAL(sv))
af09ea45 2973 mg_get(sv);
a0d0e21e 2974 if (SvROK(sv))
16d20bd9 2975 ob = (SV*)SvRV(sv);
a0d0e21e
LW
2976 else {
2977 GV* iogv;
a0d0e21e 2978
af09ea45 2979 /* this isn't a reference */
56304f61 2980 packname = Nullch;
081fc587
AB
2981
2982 if(SvOK(sv) && (packname = SvPV(sv, packlen))) {
7e8961ec
AB
2983 HE* he;
2984 he = hv_fetch_ent(PL_stashcache, sv, 0, 0);
081fc587 2985 if (he) {
5e6396ae 2986 stash = INT2PTR(HV*,SvIV(HeVAL(he)));
081fc587
AB
2987 goto fetch;
2988 }
2989 }
2990
a0d0e21e 2991 if (!SvOK(sv) ||
05f5af9a 2992 !(packname) ||
a0d0e21e
LW
2993 !(iogv = gv_fetchpv(packname, FALSE, SVt_PVIO)) ||
2994 !(ob=(SV*)GvIO(iogv)))
2995 {
af09ea45 2996 /* this isn't the name of a filehandle either */
1c846c1f 2997 if (!packname ||
fd400ab9 2998 ((UTF8_IS_START(*packname) && DO_UTF8(sv))
b86a2fa7 2999 ? !isIDFIRST_utf8((U8*)packname)
834a4ddd
LW
3000 : !isIDFIRST(*packname)
3001 ))
3002 {
f5d5a27c
CS
3003 Perl_croak(aTHX_ "Can't call method \"%s\" %s", name,
3004 SvOK(sv) ? "without a package or object reference"
3005 : "on an undefined value");
834a4ddd 3006 }
af09ea45
IK
3007 /* assume it's a package name */
3008 stash = gv_stashpvn(packname, packlen, FALSE);
0dae17bd
GS
3009 if (!stash)
3010 packsv = sv;
081fc587 3011 else {
5e6396ae 3012 SV* ref = newSViv(PTR2IV(stash));
7e8961ec
AB
3013 hv_store(PL_stashcache, packname, packlen, ref, 0);
3014 }
ac91690f 3015 goto fetch;
a0d0e21e 3016 }
af09ea45 3017 /* it _is_ a filehandle name -- replace with a reference */
3280af22 3018 *(PL_stack_base + TOPMARK + 1) = sv_2mortal(newRV((SV*)iogv));
a0d0e21e
LW
3019 }
3020
af09ea45 3021 /* if we got here, ob should be a reference or a glob */
f0d43078
GS
3022 if (!ob || !(SvOBJECT(ob)
3023 || (SvTYPE(ob) == SVt_PVGV && (ob = (SV*)GvIO((GV*)ob))
3024 && SvOBJECT(ob))))
3025 {
f5d5a27c
CS
3026 Perl_croak(aTHX_ "Can't call method \"%s\" on unblessed reference",
3027 name);
f0d43078 3028 }
a0d0e21e 3029
56304f61 3030 stash = SvSTASH(ob);
a0d0e21e 3031
ac91690f 3032 fetch:
af09ea45
IK
3033 /* NOTE: stash may be null, hope hv_fetch_ent and
3034 gv_fetchmethod can cope (it seems they can) */
3035
f5d5a27c
CS
3036 /* shortcut for simple names */
3037 if (hashp) {
3038 HE* he = hv_fetch_ent(stash, meth, 0, *hashp);
3039 if (he) {
3040 gv = (GV*)HeVAL(he);
3041 if (isGV(gv) && GvCV(gv) &&
3042 (!GvCVGEN(gv) || GvCVGEN(gv) == PL_sub_generation))
3043 return (SV*)GvCV(gv);
3044 }
3045 }
3046
0dae17bd 3047 gv = gv_fetchmethod(stash ? stash : (HV*)packsv, name);
af09ea45 3048
56304f61 3049 if (!gv) {
af09ea45
IK
3050 /* This code tries to figure out just what went wrong with
3051 gv_fetchmethod. It therefore needs to duplicate a lot of
3052 the internals of that function. We can't move it inside
3053 Perl_gv_fetchmethod_autoload(), however, since that would
3054 cause UNIVERSAL->can("NoSuchPackage::foo") to croak, and we
3055 don't want that.
3056 */
56304f61
CS
3057 char* leaf = name;
3058 char* sep = Nullch;
3059 char* p;
3060
3061 for (p = name; *p; p++) {
3062 if (*p == '\'')
3063 sep = p, leaf = p + 1;
3064 else if (*p == ':' && *(p + 1) == ':')
3065 sep = p, leaf = p + 2;
3066 }
3067 if (!sep || ((sep - name) == 5 && strnEQ(name, "SUPER", 5))) {
af09ea45
IK
3068 /* the method name is unqualified or starts with SUPER:: */
3069 packname = sep ? CopSTASHPV(PL_curcop) :
3070 stash ? HvNAME(stash) : packname;
e27ad1f2
AV
3071 if (!packname)
3072 Perl_croak(aTHX_
3073 "Can't use anonymous symbol table for method lookup");
3074 else
3075 packlen = strlen(packname);
56304f61
CS
3076 }
3077 else {
af09ea45 3078 /* the method name is qualified */
56304f61
CS
3079 packname = name;
3080 packlen = sep - name;
3081 }
af09ea45
IK
3082
3083 /* we're relying on gv_fetchmethod not autovivifying the stash */
3084 if (gv_stashpvn(packname, packlen, FALSE)) {
c1899e02 3085 Perl_croak(aTHX_
af09ea45
IK
3086 "Can't locate object method \"%s\" via package \"%.*s\"",
3087 leaf, (int)packlen, packname);
c1899e02
GS
3088 }
3089 else {
3090 Perl_croak(aTHX_
af09ea45
IK
3091 "Can't locate object method \"%s\" via package \"%.*s\""
3092 " (perhaps you forgot to load \"%.*s\"?)",
3093 leaf, (int)packlen, packname, (int)packlen, packname);
c1899e02 3094 }
56304f61 3095 }
f5d5a27c 3096 return isGV(gv) ? (SV*)GvCV(gv) : (SV*)gv;
a0d0e21e 3097}