This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
SvIsCOW_shared_hash is declared all the time, so use it.
[perl5.git] / pp_hot.c
CommitLineData
a0d0e21e
LW
1/* pp_hot.c
2 *
4bb101f2 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
241d1a3b 4 * 2000, 2001, 2002, 2003, 2004, 2005, 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
166f8a29
DM
19/* This file contains 'hot' pp ("push/pop") functions that
20 * execute the opcodes that make up a perl program. A typical pp function
21 * expects to find its arguments on the stack, and usually pushes its
22 * results onto the stack, hence the 'pp' terminology. Each OP structure
23 * contains a pointer to the relevant pp_foo() function.
24 *
25 * By 'hot', we mean common ops whose execution speed is critical.
26 * By gathering them together into a single file, we encourage
27 * CPU cache hits on hot code. Also it could be taken as a warning not to
28 * change any code in this file unless you're sure it won't affect
29 * performance.
30 */
31
a0d0e21e 32#include "EXTERN.h"
864dbfa3 33#define PERL_IN_PP_HOT_C
a0d0e21e
LW
34#include "perl.h"
35
36/* Hot code. */
37
38PP(pp_const)
39{
39644a26 40 dSP;
1d7c1841 41 XPUSHs(cSVOP_sv);
a0d0e21e
LW
42 RETURN;
43}
44
45PP(pp_nextstate)
46{
533c011a 47 PL_curcop = (COP*)PL_op;
a0d0e21e 48 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 49 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e
LW
50 FREETMPS;
51 return NORMAL;
52}
53
54PP(pp_gvsv)
55{
39644a26 56 dSP;
924508f0 57 EXTEND(SP,1);
533c011a 58 if (PL_op->op_private & OPpLVAL_INTRO)
1d7c1841 59 PUSHs(save_scalar(cGVOP_gv));
a0d0e21e 60 else
1d7c1841 61 PUSHs(GvSV(cGVOP_gv));
a0d0e21e
LW
62 RETURN;
63}
64
65PP(pp_null)
66{
67 return NORMAL;
68}
69
7399586d
HS
70PP(pp_setstate)
71{
72 PL_curcop = (COP*)PL_op;
73 return NORMAL;
74}
75
a0d0e21e
LW
76PP(pp_pushmark)
77{
3280af22 78 PUSHMARK(PL_stack_sp);
a0d0e21e
LW
79 return NORMAL;
80}
81
82PP(pp_stringify)
83{
39644a26 84 dSP; dTARGET;
6050d10e 85 sv_copypv(TARG,TOPs);
a0d0e21e
LW
86 SETTARG;
87 RETURN;
88}
89
90PP(pp_gv)
91{
39644a26 92 dSP;
1d7c1841 93 XPUSHs((SV*)cGVOP_gv);
a0d0e21e
LW
94 RETURN;
95}
96
97PP(pp_and)
98{
39644a26 99 dSP;
a0d0e21e
LW
100 if (!SvTRUE(TOPs))
101 RETURN;
102 else {
103 --SP;
104 RETURNOP(cLOGOP->op_other);
105 }
106}
107
108PP(pp_sassign)
109{
39644a26 110 dSP; dPOPTOPssrl;
748a9306 111
533c011a 112 if (PL_op->op_private & OPpASSIGN_BACKWARDS) {
a0d0e21e
LW
113 SV *temp;
114 temp = left; left = right; right = temp;
115 }
3280af22 116 if (PL_tainting && PL_tainted && !SvTAINTED(left))
a0d0e21e 117 TAINT_NOT;
54310121 118 SvSetMagicSV(right, left);
a0d0e21e
LW
119 SETs(right);
120 RETURN;
121}
122
123PP(pp_cond_expr)
124{
39644a26 125 dSP;
a0d0e21e 126 if (SvTRUEx(POPs))
1a67a97c 127 RETURNOP(cLOGOP->op_other);
a0d0e21e 128 else
1a67a97c 129 RETURNOP(cLOGOP->op_next);
a0d0e21e
LW
130}
131
132PP(pp_unstack)
133{
134 I32 oldsave;
135 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 136 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e 137 FREETMPS;
3280af22 138 oldsave = PL_scopestack[PL_scopestack_ix - 1];
a0d0e21e
LW
139 LEAVE_SCOPE(oldsave);
140 return NORMAL;
141}
142
a0d0e21e
LW
143PP(pp_concat)
144{
39644a26 145 dSP; dATARGET; tryAMAGICbin(concat,opASSIGN);
748a9306
LW
146 {
147 dPOPTOPssrl;
8d6d96c1
HS
148 bool lbyte;
149 STRLEN rlen;
a9c4fd4e
AL
150 const char *rpv = SvPV(right, rlen); /* mg_get(right) happens here */
151 const bool rbyte = !DO_UTF8(right);
152 bool rcopied = FALSE;
8d6d96c1
HS
153
154 if (TARG == right && right != left) {
155 right = sv_2mortal(newSVpvn(rpv, rlen));
1e54db1a 156 rpv = SvPV(right, rlen); /* no point setting UTF-8 here */
db79b45b 157 rcopied = TRUE;
8d6d96c1 158 }
7889fe52 159
8d6d96c1 160 if (TARG != left) {
a9c4fd4e
AL
161 STRLEN llen;
162 const char* const lpv = SvPV(left, llen); /* mg_get(left) may happen here */
90f5826e 163 lbyte = !DO_UTF8(left);
8d6d96c1
HS
164 sv_setpvn(TARG, lpv, llen);
165 if (!lbyte)
166 SvUTF8_on(TARG);
167 else
168 SvUTF8_off(TARG);
169 }
170 else { /* TARG == left */
a9c4fd4e 171 STRLEN llen;
8d6d96c1
HS
172 if (SvGMAGICAL(left))
173 mg_get(left); /* or mg_get(left) may happen here */
174 if (!SvOK(TARG))
c69006e4 175 sv_setpvn(left, "", 0);
a9c4fd4e 176 (void)SvPV_nomg(left, llen); /* Needed to set UTF8 flag */
90f5826e
ST
177 lbyte = !DO_UTF8(left);
178 if (IN_BYTES)
179 SvUTF8_off(TARG);
8d6d96c1 180 }
a12c0f56 181
8d6d96c1
HS
182 if (lbyte != rbyte) {
183 if (lbyte)
184 sv_utf8_upgrade_nomg(TARG);
185 else {
db79b45b
JH
186 if (!rcopied)
187 right = sv_2mortal(newSVpvn(rpv, rlen));
8d6d96c1
HS
188 sv_utf8_upgrade_nomg(right);
189 rpv = SvPV(right, rlen);
69b47968 190 }
a0d0e21e 191 }
8d6d96c1 192 sv_catpvn_nomg(TARG, rpv, rlen);
43ebc500 193
a0d0e21e
LW
194 SETTARG;
195 RETURN;
748a9306 196 }
a0d0e21e
LW
197}
198
199PP(pp_padsv)
200{
39644a26 201 dSP; dTARGET;
a0d0e21e 202 XPUSHs(TARG);
533c011a
NIS
203 if (PL_op->op_flags & OPf_MOD) {
204 if (PL_op->op_private & OPpLVAL_INTRO)
dd2155a4 205 SAVECLEARSV(PAD_SVl(PL_op->op_targ));
a62b51b8 206 if (PL_op->op_private & OPpDEREF) {
8ec5e241 207 PUTBACK;
dd2155a4 208 vivify_ref(PAD_SVl(PL_op->op_targ), PL_op->op_private & OPpDEREF);
8ec5e241
NIS
209 SPAGAIN;
210 }
4633a7c4 211 }
a0d0e21e
LW
212 RETURN;
213}
214
215PP(pp_readline)
216{
f5284f61 217 tryAMAGICunTARGET(iter, 0);
3280af22 218 PL_last_in_gv = (GV*)(*PL_stack_sp--);
8efb3254 219 if (SvTYPE(PL_last_in_gv) != SVt_PVGV) {
1c846c1f 220 if (SvROK(PL_last_in_gv) && SvTYPE(SvRV(PL_last_in_gv)) == SVt_PVGV)
f5284f61 221 PL_last_in_gv = (GV*)SvRV(PL_last_in_gv);
8efb3254 222 else {
f5284f61
IZ
223 dSP;
224 XPUSHs((SV*)PL_last_in_gv);
225 PUTBACK;
cea2e8a9 226 pp_rv2gv();
f5284f61 227 PL_last_in_gv = (GV*)(*PL_stack_sp--);
f5284f61
IZ
228 }
229 }
a0d0e21e
LW
230 return do_readline();
231}
232
233PP(pp_eq)
234{
39644a26 235 dSP; tryAMAGICbinSET(eq,0);
4c9fe80f 236#ifndef NV_PRESERVES_UV
0bdaccee 237 if (SvROK(TOPs) && !SvAMAGIC(TOPs) && SvROK(TOPm1s) && !SvAMAGIC(TOPm1s)) {
e61d22ef
NC
238 SP--;
239 SETs(boolSV(SvRV(TOPs) == SvRV(TOPp1s)));
4c9fe80f
AS
240 RETURN;
241 }
242#endif
28e5dec8
JH
243#ifdef PERL_PRESERVE_IVUV
244 SvIV_please(TOPs);
245 if (SvIOK(TOPs)) {
4c9fe80f
AS
246 /* Unless the left argument is integer in range we are going
247 to have to use NV maths. Hence only attempt to coerce the
248 right argument if we know the left is integer. */
28e5dec8
JH
249 SvIV_please(TOPm1s);
250 if (SvIOK(TOPm1s)) {
251 bool auvok = SvUOK(TOPm1s);
252 bool buvok = SvUOK(TOPs);
a12c0f56 253
1605159e
NC
254 if (auvok == buvok) { /* ## IV == IV or UV == UV ## */
255 /* Casting IV to UV before comparison isn't going to matter
256 on 2s complement. On 1s complement or sign&magnitude
257 (if we have any of them) it could to make negative zero
258 differ from normal zero. As I understand it. (Need to
259 check - is negative zero implementation defined behaviour
260 anyway?). NWC */
261 UV buv = SvUVX(POPs);
262 UV auv = SvUVX(TOPs);
28e5dec8 263
28e5dec8
JH
264 SETs(boolSV(auv == buv));
265 RETURN;
266 }
267 { /* ## Mixed IV,UV ## */
1605159e 268 SV *ivp, *uvp;
28e5dec8 269 IV iv;
28e5dec8 270
1605159e 271 /* == is commutative so doesn't matter which is left or right */
28e5dec8 272 if (auvok) {
1605159e
NC
273 /* top of stack (b) is the iv */
274 ivp = *SP;
275 uvp = *--SP;
276 } else {
277 uvp = *SP;
278 ivp = *--SP;
279 }
280 iv = SvIVX(ivp);
281 if (iv < 0) {
282 /* As uv is a UV, it's >0, so it cannot be == */
283 SETs(&PL_sv_no);
284 RETURN;
285 }
28e5dec8 286 /* we know iv is >= 0 */
1605159e 287 SETs(boolSV((UV)iv == SvUVX(uvp)));
28e5dec8
JH
288 RETURN;
289 }
290 }
291 }
292#endif
a0d0e21e
LW
293 {
294 dPOPnv;
54310121 295 SETs(boolSV(TOPn == value));
a0d0e21e
LW
296 RETURN;
297 }
298}
299
300PP(pp_preinc)
301{
39644a26 302 dSP;
f39684df 303 if (SvTYPE(TOPs) >= SVt_PVGV && SvTYPE(TOPs) != SVt_PVLV)
d470f89e 304 DIE(aTHX_ PL_no_modify);
3510b4a1
NC
305 if (!SvREADONLY(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
306 && SvIVX(TOPs) != IV_MAX)
55497cff 307 {
45977657 308 SvIV_set(TOPs, SvIVX(TOPs) + 1);
55497cff 309 SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
748a9306 310 }
28e5dec8 311 else /* Do all the PERL_PRESERVE_IVUV conditionals in sv_inc */
748a9306 312 sv_inc(TOPs);
a0d0e21e
LW
313 SvSETMAGIC(TOPs);
314 return NORMAL;
315}
316
317PP(pp_or)
318{
39644a26 319 dSP;
a0d0e21e
LW
320 if (SvTRUE(TOPs))
321 RETURN;
322 else {
323 --SP;
324 RETURNOP(cLOGOP->op_other);
325 }
326}
327
c963b151
BD
328PP(pp_dor)
329{
330 /* Most of this is lifted straight from pp_defined */
331 dSP;
a3b680e6 332 register SV* const sv = TOPs;
c963b151 333
c963b151
BD
334 if (!sv || !SvANY(sv)) {
335 --SP;
336 RETURNOP(cLOGOP->op_other);
337 }
338
339 switch (SvTYPE(sv)) {
340 case SVt_PVAV:
341 if (AvMAX(sv) >= 0 || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
342 RETURN;
343 break;
344 case SVt_PVHV:
345 if (HvARRAY(sv) || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
346 RETURN;
347 break;
348 case SVt_PVCV:
349 if (CvROOT(sv) || CvXSUB(sv))
350 RETURN;
351 break;
352 default:
353 if (SvGMAGICAL(sv))
354 mg_get(sv);
355 if (SvOK(sv))
356 RETURN;
357 }
358
359 --SP;
360 RETURNOP(cLOGOP->op_other);
361}
362
a0d0e21e
LW
363PP(pp_add)
364{
39644a26 365 dSP; dATARGET; bool useleft; tryAMAGICbin(add,opASSIGN);
28e5dec8
JH
366 useleft = USE_LEFT(TOPm1s);
367#ifdef PERL_PRESERVE_IVUV
368 /* We must see if we can perform the addition with integers if possible,
369 as the integer code detects overflow while the NV code doesn't.
370 If either argument hasn't had a numeric conversion yet attempt to get
371 the IV. It's important to do this now, rather than just assuming that
372 it's not IOK as a PV of "9223372036854775806" may not take well to NV
373 addition, and an SV which is NOK, NV=6.0 ought to be coerced to
374 integer in case the second argument is IV=9223372036854775806
375 We can (now) rely on sv_2iv to do the right thing, only setting the
376 public IOK flag if the value in the NV (or PV) slot is truly integer.
377
378 A side effect is that this also aggressively prefers integer maths over
7dca457a
NC
379 fp maths for integer values.
380
a00b5bd3 381 How to detect overflow?
7dca457a
NC
382
383 C 99 section 6.2.6.1 says
384
385 The range of nonnegative values of a signed integer type is a subrange
386 of the corresponding unsigned integer type, and the representation of
387 the same value in each type is the same. A computation involving
388 unsigned operands can never overflow, because a result that cannot be
389 represented by the resulting unsigned integer type is reduced modulo
390 the number that is one greater than the largest value that can be
391 represented by the resulting type.
392
393 (the 9th paragraph)
394
395 which I read as "unsigned ints wrap."
396
397 signed integer overflow seems to be classed as "exception condition"
398
399 If an exceptional condition occurs during the evaluation of an
400 expression (that is, if the result is not mathematically defined or not
401 in the range of representable values for its type), the behavior is
402 undefined.
403
404 (6.5, the 5th paragraph)
405
406 I had assumed that on 2s complement machines signed arithmetic would
407 wrap, hence coded pp_add and pp_subtract on the assumption that
408 everything perl builds on would be happy. After much wailing and
409 gnashing of teeth it would seem that irix64 knows its ANSI spec well,
410 knows that it doesn't need to, and doesn't. Bah. Anyway, the all-
411 unsigned code below is actually shorter than the old code. :-)
412 */
413
28e5dec8
JH
414 SvIV_please(TOPs);
415 if (SvIOK(TOPs)) {
416 /* Unless the left argument is integer in range we are going to have to
417 use NV maths. Hence only attempt to coerce the right argument if
418 we know the left is integer. */
9c5ffd7c
JH
419 register UV auv = 0;
420 bool auvok = FALSE;
7dca457a
NC
421 bool a_valid = 0;
422
28e5dec8 423 if (!useleft) {
7dca457a
NC
424 auv = 0;
425 a_valid = auvok = 1;
426 /* left operand is undef, treat as zero. + 0 is identity,
427 Could SETi or SETu right now, but space optimise by not adding
428 lots of code to speed up what is probably a rarish case. */
429 } else {
430 /* Left operand is defined, so is it IV? */
431 SvIV_please(TOPm1s);
432 if (SvIOK(TOPm1s)) {
433 if ((auvok = SvUOK(TOPm1s)))
434 auv = SvUVX(TOPm1s);
435 else {
a3b680e6 436 register const IV aiv = SvIVX(TOPm1s);
7dca457a
NC
437 if (aiv >= 0) {
438 auv = aiv;
439 auvok = 1; /* Now acting as a sign flag. */
440 } else { /* 2s complement assumption for IV_MIN */
441 auv = (UV)-aiv;
442 }
443 }
444 a_valid = 1;
28e5dec8
JH
445 }
446 }
7dca457a
NC
447 if (a_valid) {
448 bool result_good = 0;
449 UV result;
450 register UV buv;
28e5dec8 451 bool buvok = SvUOK(TOPs);
a00b5bd3 452
7dca457a
NC
453 if (buvok)
454 buv = SvUVX(TOPs);
455 else {
a3b680e6 456 register const IV biv = SvIVX(TOPs);
7dca457a
NC
457 if (biv >= 0) {
458 buv = biv;
459 buvok = 1;
460 } else
461 buv = (UV)-biv;
462 }
463 /* ?uvok if value is >= 0. basically, flagged as UV if it's +ve,
602f51c4 464 else "IV" now, independent of how it came in.
7dca457a
NC
465 if a, b represents positive, A, B negative, a maps to -A etc
466 a + b => (a + b)
467 A + b => -(a - b)
468 a + B => (a - b)
469 A + B => -(a + b)
470 all UV maths. negate result if A negative.
471 add if signs same, subtract if signs differ. */
472
473 if (auvok ^ buvok) {
474 /* Signs differ. */
475 if (auv >= buv) {
476 result = auv - buv;
477 /* Must get smaller */
478 if (result <= auv)
479 result_good = 1;
480 } else {
481 result = buv - auv;
482 if (result <= buv) {
483 /* result really should be -(auv-buv). as its negation
484 of true value, need to swap our result flag */
485 auvok = !auvok;
486 result_good = 1;
28e5dec8
JH
487 }
488 }
7dca457a
NC
489 } else {
490 /* Signs same */
491 result = auv + buv;
492 if (result >= auv)
493 result_good = 1;
494 }
495 if (result_good) {
496 SP--;
497 if (auvok)
28e5dec8 498 SETu( result );
7dca457a
NC
499 else {
500 /* Negate result */
501 if (result <= (UV)IV_MIN)
502 SETi( -(IV)result );
503 else {
504 /* result valid, but out of range for IV. */
505 SETn( -(NV)result );
28e5dec8
JH
506 }
507 }
7dca457a
NC
508 RETURN;
509 } /* Overflow, drop through to NVs. */
28e5dec8
JH
510 }
511 }
512#endif
a0d0e21e 513 {
28e5dec8
JH
514 dPOPnv;
515 if (!useleft) {
516 /* left operand is undef, treat as zero. + 0.0 is identity. */
517 SETn(value);
518 RETURN;
519 }
520 SETn( value + TOPn );
521 RETURN;
a0d0e21e
LW
522 }
523}
524
525PP(pp_aelemfast)
526{
39644a26 527 dSP;
6a077020
DM
528 AV *av = PL_op->op_flags & OPf_SPECIAL ?
529 (AV*)PAD_SV(PL_op->op_targ) : GvAV(cGVOP_gv);
a3b680e6 530 const U32 lval = PL_op->op_flags & OPf_MOD;
533c011a 531 SV** svp = av_fetch(av, PL_op->op_private, lval);
3280af22 532 SV *sv = (svp ? *svp : &PL_sv_undef);
6ff81951 533 EXTEND(SP, 1);
be6c24e0
GS
534 if (!lval && SvGMAGICAL(sv)) /* see note in pp_helem() */
535 sv = sv_mortalcopy(sv);
536 PUSHs(sv);
a0d0e21e
LW
537 RETURN;
538}
539
540PP(pp_join)
541{
39644a26 542 dSP; dMARK; dTARGET;
a0d0e21e
LW
543 MARK++;
544 do_join(TARG, *MARK, MARK, SP);
545 SP = MARK;
546 SETs(TARG);
547 RETURN;
548}
549
550PP(pp_pushre)
551{
39644a26 552 dSP;
44a8e56a
PP
553#ifdef DEBUGGING
554 /*
555 * We ass_u_me that LvTARGOFF() comes first, and that two STRLENs
556 * will be enough to hold an OP*.
557 */
558 SV* sv = sv_newmortal();
559 sv_upgrade(sv, SVt_PVLV);
560 LvTYPE(sv) = '/';
533c011a 561 Copy(&PL_op, &LvTARGOFF(sv), 1, OP*);
44a8e56a
PP
562 XPUSHs(sv);
563#else
6b88bc9c 564 XPUSHs((SV*)PL_op);
44a8e56a 565#endif
a0d0e21e
LW
566 RETURN;
567}
568
569/* Oversized hot code. */
570
571PP(pp_print)
572{
27da23d5 573 dVAR; dSP; dMARK; dORIGMARK;
a0d0e21e
LW
574 GV *gv;
575 IO *io;
760ac839 576 register PerlIO *fp;
236988e4 577 MAGIC *mg;
a0d0e21e 578
533c011a 579 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e
LW
580 gv = (GV*)*++MARK;
581 else
3280af22 582 gv = PL_defoutgv;
5b468f54
AMS
583
584 if (gv && (io = GvIO(gv))
585 && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar)))
586 {
01bb7c6d 587 had_magic:
68dc0745 588 if (MARK == ORIGMARK) {
1c846c1f 589 /* If using default handle then we need to make space to
a60c0954
NIS
590 * pass object as 1st arg, so move other args up ...
591 */
4352c267 592 MEXTEND(SP, 1);
68dc0745
PP
593 ++MARK;
594 Move(MARK, MARK + 1, (SP - MARK) + 1, SV*);
595 ++SP;
596 }
597 PUSHMARK(MARK - 1);
5b468f54 598 *MARK = SvTIED_obj((SV*)io, mg);
68dc0745 599 PUTBACK;
236988e4 600 ENTER;
864dbfa3 601 call_method("PRINT", G_SCALAR);
236988e4
PP
602 LEAVE;
603 SPAGAIN;
68dc0745
PP
604 MARK = ORIGMARK + 1;
605 *MARK = *SP;
606 SP = MARK;
236988e4
PP
607 RETURN;
608 }
a0d0e21e 609 if (!(io = GvIO(gv))) {
5b468f54
AMS
610 if ((GvEGV(gv)) && (io = GvIO(GvEGV(gv)))
611 && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar)))
01bb7c6d 612 goto had_magic;
2dd78f96
JH
613 if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
614 report_evil_fh(gv, io, PL_op->op_type);
93189314 615 SETERRNO(EBADF,RMS_IFI);
a0d0e21e
LW
616 goto just_say_no;
617 }
618 else if (!(fp = IoOFP(io))) {
599cee73 619 if (ckWARN2(WARN_CLOSED, WARN_IO)) {
4c80c0b2
NC
620 if (IoIFP(io))
621 report_evil_fh(gv, io, OP_phoney_INPUT_ONLY);
2dd78f96 622 else if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
bc37a18f 623 report_evil_fh(gv, io, PL_op->op_type);
a0d0e21e 624 }
93189314 625 SETERRNO(EBADF,IoIFP(io)?RMS_FAC:RMS_IFI);
a0d0e21e
LW
626 goto just_say_no;
627 }
628 else {
629 MARK++;
7889fe52 630 if (PL_ofs_sv && SvOK(PL_ofs_sv)) {
a0d0e21e
LW
631 while (MARK <= SP) {
632 if (!do_print(*MARK, fp))
633 break;
634 MARK++;
635 if (MARK <= SP) {
7889fe52 636 if (!do_print(PL_ofs_sv, fp)) { /* $, */
a0d0e21e
LW
637 MARK--;
638 break;
639 }
640 }
641 }
642 }
643 else {
644 while (MARK <= SP) {
645 if (!do_print(*MARK, fp))
646 break;
647 MARK++;
648 }
649 }
650 if (MARK <= SP)
651 goto just_say_no;
652 else {
7889fe52
NIS
653 if (PL_ors_sv && SvOK(PL_ors_sv))
654 if (!do_print(PL_ors_sv, fp)) /* $\ */
a0d0e21e
LW
655 goto just_say_no;
656
657 if (IoFLAGS(io) & IOf_FLUSH)
760ac839 658 if (PerlIO_flush(fp) == EOF)
a0d0e21e
LW
659 goto just_say_no;
660 }
661 }
662 SP = ORIGMARK;
3280af22 663 PUSHs(&PL_sv_yes);
a0d0e21e
LW
664 RETURN;
665
666 just_say_no:
667 SP = ORIGMARK;
3280af22 668 PUSHs(&PL_sv_undef);
a0d0e21e
LW
669 RETURN;
670}
671
672PP(pp_rv2av)
673{
39644a26 674 dSP; dTOPss;
a0d0e21e
LW
675 AV *av;
676
677 if (SvROK(sv)) {
678 wasref:
f5284f61
IZ
679 tryAMAGICunDEREF(to_av);
680
a0d0e21e
LW
681 av = (AV*)SvRV(sv);
682 if (SvTYPE(av) != SVt_PVAV)
cea2e8a9 683 DIE(aTHX_ "Not an ARRAY reference");
533c011a 684 if (PL_op->op_flags & OPf_REF) {
f5284f61 685 SETs((SV*)av);
a0d0e21e
LW
686 RETURN;
687 }
78f9721b
SM
688 else if (LVRET) {
689 if (GIMME == G_SCALAR)
690 Perl_croak(aTHX_ "Can't return array to lvalue scalar context");
691 SETs((SV*)av);
692 RETURN;
693 }
82d03984
RGS
694 else if (PL_op->op_flags & OPf_MOD
695 && PL_op->op_private & OPpLVAL_INTRO)
696 Perl_croak(aTHX_ PL_no_localize_ref);
a0d0e21e
LW
697 }
698 else {
699 if (SvTYPE(sv) == SVt_PVAV) {
700 av = (AV*)sv;
533c011a 701 if (PL_op->op_flags & OPf_REF) {
f5284f61 702 SETs((SV*)av);
a0d0e21e
LW
703 RETURN;
704 }
78f9721b
SM
705 else if (LVRET) {
706 if (GIMME == G_SCALAR)
707 Perl_croak(aTHX_ "Can't return array to lvalue"
708 " scalar context");
709 SETs((SV*)av);
710 RETURN;
711 }
a0d0e21e
LW
712 }
713 else {
67955e0c 714 GV *gv;
1c846c1f 715
a0d0e21e
LW
716 if (SvTYPE(sv) != SVt_PVGV) {
717 if (SvGMAGICAL(sv)) {
718 mg_get(sv);
719 if (SvROK(sv))
720 goto wasref;
721 }
722 if (!SvOK(sv)) {
533c011a
NIS
723 if (PL_op->op_flags & OPf_REF ||
724 PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 725 DIE(aTHX_ PL_no_usym, "an ARRAY");
599cee73 726 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 727 report_uninit(sv);
f5284f61 728 if (GIMME == G_ARRAY) {
c2444246 729 (void)POPs;
4633a7c4 730 RETURN;
f5284f61
IZ
731 }
732 RETSETUNDEF;
a0d0e21e 733 }
35cd451c
GS
734 if ((PL_op->op_flags & OPf_SPECIAL) &&
735 !(PL_op->op_flags & OPf_MOD))
736 {
7a5fd60d 737 gv = (GV*)gv_fetchsv(sv, FALSE, SVt_PVAV);
c9d5ac95 738 if (!gv
7a5fd60d
NC
739 && (!is_gv_magical_sv(sv,0)
740 || !(gv = (GV*)gv_fetchsv(sv, TRUE, SVt_PVAV))))
c9d5ac95 741 {
35cd451c 742 RETSETUNDEF;
c9d5ac95 743 }
35cd451c
GS
744 }
745 else {
746 if (PL_op->op_private & HINT_STRICT_REFS)
7a5fd60d
NC
747 DIE(aTHX_ PL_no_symref_sv, sv, "an ARRAY");
748 gv = (GV*)gv_fetchsv(sv, TRUE, SVt_PVAV);
35cd451c
GS
749 }
750 }
751 else {
67955e0c 752 gv = (GV*)sv;
a0d0e21e 753 }
67955e0c 754 av = GvAVn(gv);
533c011a 755 if (PL_op->op_private & OPpLVAL_INTRO)
67955e0c 756 av = save_ary(gv);
533c011a 757 if (PL_op->op_flags & OPf_REF) {
f5284f61 758 SETs((SV*)av);
a0d0e21e
LW
759 RETURN;
760 }
78f9721b
SM
761 else if (LVRET) {
762 if (GIMME == G_SCALAR)
763 Perl_croak(aTHX_ "Can't return array to lvalue"
764 " scalar context");
765 SETs((SV*)av);
766 RETURN;
767 }
a0d0e21e
LW
768 }
769 }
770
771 if (GIMME == G_ARRAY) {
a3b680e6 772 const I32 maxarg = AvFILL(av) + 1;
c2444246 773 (void)POPs; /* XXXX May be optimized away? */
1c846c1f 774 EXTEND(SP, maxarg);
93965878 775 if (SvRMAGICAL(av)) {
1c846c1f 776 U32 i;
eb160463 777 for (i=0; i < (U32)maxarg; i++) {
93965878 778 SV **svp = av_fetch(av, i, FALSE);
547d1dd8
HS
779 /* See note in pp_helem, and bug id #27839 */
780 SP[i+1] = svp
781 ? SvGMAGICAL(*svp) ? sv_mortalcopy(*svp) : *svp
782 : &PL_sv_undef;
93965878 783 }
1c846c1f 784 }
93965878
NIS
785 else {
786 Copy(AvARRAY(av), SP+1, maxarg, SV*);
787 }
a0d0e21e
LW
788 SP += maxarg;
789 }
c754c3d7 790 else if (GIMME_V == G_SCALAR) {
a0d0e21e 791 dTARGET;
a3b680e6 792 const I32 maxarg = AvFILL(av) + 1;
f5284f61 793 SETi(maxarg);
a0d0e21e
LW
794 }
795 RETURN;
796}
797
798PP(pp_rv2hv)
799{
39644a26 800 dSP; dTOPss;
a0d0e21e 801 HV *hv;
a3b680e6
AL
802 const I32 gimme = GIMME_V;
803 static const char return_hash_to_lvalue_scalar[] = "Can't return hash to lvalue scalar context";
a0d0e21e
LW
804
805 if (SvROK(sv)) {
806 wasref:
f5284f61
IZ
807 tryAMAGICunDEREF(to_hv);
808
a0d0e21e 809 hv = (HV*)SvRV(sv);
6d822dc4 810 if (SvTYPE(hv) != SVt_PVHV)
cea2e8a9 811 DIE(aTHX_ "Not a HASH reference");
533c011a 812 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
813 SETs((SV*)hv);
814 RETURN;
815 }
78f9721b 816 else if (LVRET) {
be85d344 817 if (gimme != G_ARRAY)
a3b680e6 818 Perl_croak(aTHX_ return_hash_to_lvalue_scalar );
78f9721b
SM
819 SETs((SV*)hv);
820 RETURN;
821 }
82d03984
RGS
822 else if (PL_op->op_flags & OPf_MOD
823 && PL_op->op_private & OPpLVAL_INTRO)
824 Perl_croak(aTHX_ PL_no_localize_ref);
a0d0e21e
LW
825 }
826 else {
6d822dc4 827 if (SvTYPE(sv) == SVt_PVHV) {
a0d0e21e 828 hv = (HV*)sv;
533c011a 829 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
830 SETs((SV*)hv);
831 RETURN;
832 }
78f9721b 833 else if (LVRET) {
be85d344 834 if (gimme != G_ARRAY)
a3b680e6 835 Perl_croak(aTHX_ return_hash_to_lvalue_scalar );
78f9721b
SM
836 SETs((SV*)hv);
837 RETURN;
838 }
a0d0e21e
LW
839 }
840 else {
67955e0c 841 GV *gv;
1c846c1f 842
a0d0e21e
LW
843 if (SvTYPE(sv) != SVt_PVGV) {
844 if (SvGMAGICAL(sv)) {
845 mg_get(sv);
846 if (SvROK(sv))
847 goto wasref;
848 }
849 if (!SvOK(sv)) {
533c011a
NIS
850 if (PL_op->op_flags & OPf_REF ||
851 PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 852 DIE(aTHX_ PL_no_usym, "a HASH");
599cee73 853 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 854 report_uninit(sv);
be85d344 855 if (gimme == G_ARRAY) {
4633a7c4
LW
856 SP--;
857 RETURN;
858 }
a0d0e21e
LW
859 RETSETUNDEF;
860 }
35cd451c
GS
861 if ((PL_op->op_flags & OPf_SPECIAL) &&
862 !(PL_op->op_flags & OPf_MOD))
863 {
7a5fd60d 864 gv = (GV*)gv_fetchsv(sv, FALSE, SVt_PVHV);
c9d5ac95 865 if (!gv
7a5fd60d
NC
866 && (!is_gv_magical_sv(sv,0)
867 || !(gv = (GV*)gv_fetchsv(sv, TRUE, SVt_PVHV))))
c9d5ac95 868 {
35cd451c 869 RETSETUNDEF;
c9d5ac95 870 }
35cd451c
GS
871 }
872 else {
873 if (PL_op->op_private & HINT_STRICT_REFS)
7a5fd60d
NC
874 DIE(aTHX_ PL_no_symref_sv, sv, "a HASH");
875 gv = (GV*)gv_fetchsv(sv, TRUE, SVt_PVHV);
35cd451c
GS
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)
a3b680e6 890 Perl_croak(aTHX_ return_hash_to_lvalue_scalar );
78f9721b
SM
891 SETs((SV*)hv);
892 RETURN;
893 }
a0d0e21e
LW
894 }
895 }
896
be85d344 897 if (gimme == G_ARRAY) { /* array wanted */
3280af22 898 *PL_stack_sp = (SV*)hv;
cea2e8a9 899 return do_kv();
a0d0e21e 900 }
be85d344 901 else if (gimme == G_SCALAR) {
a0d0e21e 902 dTARGET;
243d6ab3 903 TARG = Perl_hv_scalar(aTHX_ hv);
a0d0e21e 904 SETTARG;
a0d0e21e 905 }
be85d344 906 RETURN;
a0d0e21e
LW
907}
908
10c8fecd
GS
909STATIC void
910S_do_oddball(pTHX_ HV *hash, SV **relem, SV **firstrelem)
911{
912 if (*relem) {
913 SV *tmpstr;
b464bac0 914 const HE *didstore;
6d822dc4
MS
915
916 if (ckWARN(WARN_MISC)) {
a3b680e6 917 const char *err;
10c8fecd
GS
918 if (relem == firstrelem &&
919 SvROK(*relem) &&
920 (SvTYPE(SvRV(*relem)) == SVt_PVAV ||
921 SvTYPE(SvRV(*relem)) == SVt_PVHV))
922 {
a3b680e6 923 err = "Reference found where even-sized list expected";
10c8fecd
GS
924 }
925 else
a3b680e6
AL
926 err = "Odd number of elements in hash assignment";
927 Perl_warner(aTHX_ packWARN(WARN_MISC), err);
10c8fecd 928 }
6d822dc4
MS
929
930 tmpstr = NEWSV(29,0);
931 didstore = hv_store_ent(hash,*relem,tmpstr,0);
932 if (SvMAGICAL(hash)) {
933 if (SvSMAGICAL(tmpstr))
934 mg_set(tmpstr);
935 if (!didstore)
936 sv_2mortal(tmpstr);
937 }
938 TAINT_NOT;
10c8fecd
GS
939 }
940}
941
a0d0e21e
LW
942PP(pp_aassign)
943{
27da23d5 944 dVAR; dSP;
3280af22
NIS
945 SV **lastlelem = PL_stack_sp;
946 SV **lastrelem = PL_stack_base + POPMARK;
947 SV **firstrelem = PL_stack_base + POPMARK + 1;
a0d0e21e
LW
948 SV **firstlelem = lastrelem + 1;
949
950 register SV **relem;
951 register SV **lelem;
952
953 register SV *sv;
954 register AV *ary;
955
54310121 956 I32 gimme;
a0d0e21e
LW
957 HV *hash;
958 I32 i;
959 int magic;
ca65944e 960 int duplicates = 0;
5637b936
NC
961 SV **firsthashrelem = 0; /* "= 0" keeps gcc 2.95 quiet */
962
a0d0e21e 963
3280af22 964 PL_delaymagic = DM_DELAY; /* catch simultaneous items */
ca65944e 965 gimme = GIMME_V;
a0d0e21e
LW
966
967 /* If there's a common identifier on both sides we have to take
968 * special care that assigning the identifier on the left doesn't
969 * clobber a value on the right that's used later in the list.
970 */
10c8fecd 971 if (PL_op->op_private & (OPpASSIGN_COMMON)) {
cc5e57d2 972 EXTEND_MORTAL(lastrelem - firstrelem + 1);
10c8fecd
GS
973 for (relem = firstrelem; relem <= lastrelem; relem++) {
974 /*SUPPRESS 560*/
155aba94 975 if ((sv = *relem)) {
a1f49e72 976 TAINT_NOT; /* Each item is independent */
10c8fecd 977 *relem = sv_mortalcopy(sv);
a1f49e72 978 }
10c8fecd 979 }
a0d0e21e
LW
980 }
981
982 relem = firstrelem;
983 lelem = firstlelem;
984 ary = Null(AV*);
985 hash = Null(HV*);
10c8fecd 986
a0d0e21e 987 while (lelem <= lastlelem) {
bbce6d69 988 TAINT_NOT; /* Each item stands on its own, taintwise. */
a0d0e21e
LW
989 sv = *lelem++;
990 switch (SvTYPE(sv)) {
991 case SVt_PVAV:
992 ary = (AV*)sv;
748a9306 993 magic = SvMAGICAL(ary) != 0;
a0d0e21e 994 av_clear(ary);
7e42bd57 995 av_extend(ary, lastrelem - relem);
a0d0e21e
LW
996 i = 0;
997 while (relem <= lastrelem) { /* gobble up all the rest */
5117ca91 998 SV **didstore;
a0d0e21e 999 assert(*relem);
f2b990bf 1000 sv = newSVsv(*relem);
a0d0e21e 1001 *(relem++) = sv;
5117ca91
GS
1002 didstore = av_store(ary,i++,sv);
1003 if (magic) {
fb73857a
PP
1004 if (SvSMAGICAL(sv))
1005 mg_set(sv);
5117ca91 1006 if (!didstore)
8127e0e3 1007 sv_2mortal(sv);
5117ca91 1008 }
bbce6d69 1009 TAINT_NOT;
a0d0e21e
LW
1010 }
1011 break;
10c8fecd 1012 case SVt_PVHV: { /* normal hash */
a0d0e21e
LW
1013 SV *tmpstr;
1014
1015 hash = (HV*)sv;
748a9306 1016 magic = SvMAGICAL(hash) != 0;
a0d0e21e 1017 hv_clear(hash);
ca65944e 1018 firsthashrelem = relem;
a0d0e21e
LW
1019
1020 while (relem < lastrelem) { /* gobble up all the rest */
5117ca91 1021 HE *didstore;
4633a7c4 1022 if (*relem)
a0d0e21e 1023 sv = *(relem++);
4633a7c4 1024 else
3280af22 1025 sv = &PL_sv_no, relem++;
a0d0e21e
LW
1026 tmpstr = NEWSV(29,0);
1027 if (*relem)
1028 sv_setsv(tmpstr,*relem); /* value */
1029 *(relem++) = tmpstr;
ca65944e
RGS
1030 if (gimme != G_VOID && hv_exists_ent(hash, sv, 0))
1031 /* key overwrites an existing entry */
1032 duplicates += 2;
5117ca91
GS
1033 didstore = hv_store_ent(hash,sv,tmpstr,0);
1034 if (magic) {
fb73857a
PP
1035 if (SvSMAGICAL(tmpstr))
1036 mg_set(tmpstr);
5117ca91 1037 if (!didstore)
8127e0e3 1038 sv_2mortal(tmpstr);
5117ca91 1039 }
bbce6d69 1040 TAINT_NOT;
8e07c86e 1041 }
6a0deba8 1042 if (relem == lastrelem) {
10c8fecd 1043 do_oddball(hash, relem, firstrelem);
6a0deba8 1044 relem++;
1930e939 1045 }
a0d0e21e
LW
1046 }
1047 break;
1048 default:
6fc92669
GS
1049 if (SvIMMORTAL(sv)) {
1050 if (relem <= lastrelem)
1051 relem++;
1052 break;
a0d0e21e
LW
1053 }
1054 if (relem <= lastrelem) {
1055 sv_setsv(sv, *relem);
1056 *(relem++) = sv;
1057 }
1058 else
3280af22 1059 sv_setsv(sv, &PL_sv_undef);
a0d0e21e
LW
1060 SvSETMAGIC(sv);
1061 break;
1062 }
1063 }
3280af22
NIS
1064 if (PL_delaymagic & ~DM_DELAY) {
1065 if (PL_delaymagic & DM_UID) {
a0d0e21e 1066#ifdef HAS_SETRESUID
fb934a90
RD
1067 (void)setresuid((PL_delaymagic & DM_RUID) ? PL_uid : (Uid_t)-1,
1068 (PL_delaymagic & DM_EUID) ? PL_euid : (Uid_t)-1,
1069 (Uid_t)-1);
56febc5e
AD
1070#else
1071# ifdef HAS_SETREUID
fb934a90
RD
1072 (void)setreuid((PL_delaymagic & DM_RUID) ? PL_uid : (Uid_t)-1,
1073 (PL_delaymagic & DM_EUID) ? PL_euid : (Uid_t)-1);
56febc5e
AD
1074# else
1075# ifdef HAS_SETRUID
b28d0864
NIS
1076 if ((PL_delaymagic & DM_UID) == DM_RUID) {
1077 (void)setruid(PL_uid);
1078 PL_delaymagic &= ~DM_RUID;
a0d0e21e 1079 }
56febc5e
AD
1080# endif /* HAS_SETRUID */
1081# ifdef HAS_SETEUID
b28d0864 1082 if ((PL_delaymagic & DM_UID) == DM_EUID) {
fb934a90 1083 (void)seteuid(PL_euid);
b28d0864 1084 PL_delaymagic &= ~DM_EUID;
a0d0e21e 1085 }
56febc5e 1086# endif /* HAS_SETEUID */
b28d0864
NIS
1087 if (PL_delaymagic & DM_UID) {
1088 if (PL_uid != PL_euid)
cea2e8a9 1089 DIE(aTHX_ "No setreuid available");
b28d0864 1090 (void)PerlProc_setuid(PL_uid);
a0d0e21e 1091 }
56febc5e
AD
1092# endif /* HAS_SETREUID */
1093#endif /* HAS_SETRESUID */
d8eceb89
JH
1094 PL_uid = PerlProc_getuid();
1095 PL_euid = PerlProc_geteuid();
a0d0e21e 1096 }
3280af22 1097 if (PL_delaymagic & DM_GID) {
a0d0e21e 1098#ifdef HAS_SETRESGID
fb934a90
RD
1099 (void)setresgid((PL_delaymagic & DM_RGID) ? PL_gid : (Gid_t)-1,
1100 (PL_delaymagic & DM_EGID) ? PL_egid : (Gid_t)-1,
1101 (Gid_t)-1);
56febc5e
AD
1102#else
1103# ifdef HAS_SETREGID
fb934a90
RD
1104 (void)setregid((PL_delaymagic & DM_RGID) ? PL_gid : (Gid_t)-1,
1105 (PL_delaymagic & DM_EGID) ? PL_egid : (Gid_t)-1);
56febc5e
AD
1106# else
1107# ifdef HAS_SETRGID
b28d0864
NIS
1108 if ((PL_delaymagic & DM_GID) == DM_RGID) {
1109 (void)setrgid(PL_gid);
1110 PL_delaymagic &= ~DM_RGID;
a0d0e21e 1111 }
56febc5e
AD
1112# endif /* HAS_SETRGID */
1113# ifdef HAS_SETEGID
b28d0864 1114 if ((PL_delaymagic & DM_GID) == DM_EGID) {
fb934a90 1115 (void)setegid(PL_egid);
b28d0864 1116 PL_delaymagic &= ~DM_EGID;
a0d0e21e 1117 }
56febc5e 1118# endif /* HAS_SETEGID */
b28d0864
NIS
1119 if (PL_delaymagic & DM_GID) {
1120 if (PL_gid != PL_egid)
cea2e8a9 1121 DIE(aTHX_ "No setregid available");
b28d0864 1122 (void)PerlProc_setgid(PL_gid);
a0d0e21e 1123 }
56febc5e
AD
1124# endif /* HAS_SETREGID */
1125#endif /* HAS_SETRESGID */
d8eceb89
JH
1126 PL_gid = PerlProc_getgid();
1127 PL_egid = PerlProc_getegid();
a0d0e21e 1128 }
3280af22 1129 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
a0d0e21e 1130 }
3280af22 1131 PL_delaymagic = 0;
54310121 1132
54310121
PP
1133 if (gimme == G_VOID)
1134 SP = firstrelem - 1;
1135 else if (gimme == G_SCALAR) {
1136 dTARGET;
1137 SP = firstrelem;
ca65944e 1138 SETi(lastrelem - firstrelem + 1 - duplicates);
54310121
PP
1139 }
1140 else {
ca65944e 1141 if (ary)
a0d0e21e 1142 SP = lastrelem;
ca65944e
RGS
1143 else if (hash) {
1144 if (duplicates) {
1145 /* Removes from the stack the entries which ended up as
1146 * duplicated keys in the hash (fix for [perl #24380]) */
1147 Move(firsthashrelem + duplicates,
1148 firsthashrelem, duplicates, SV**);
1149 lastrelem -= duplicates;
1150 }
1151 SP = lastrelem;
1152 }
a0d0e21e
LW
1153 else
1154 SP = firstrelem + (lastlelem - firstlelem);
0c8c7a05 1155 lelem = firstlelem + (relem - firstrelem);
5f05dabc 1156 while (relem <= SP)
3280af22 1157 *relem++ = (lelem <= lastlelem) ? *lelem++ : &PL_sv_undef;
a0d0e21e 1158 }
54310121 1159 RETURN;
a0d0e21e
LW
1160}
1161
8782bef2
GB
1162PP(pp_qr)
1163{
39644a26 1164 dSP;
8782bef2
GB
1165 register PMOP *pm = cPMOP;
1166 SV *rv = sv_newmortal();
57668c4d 1167 SV *sv = newSVrv(rv, "Regexp");
e08e52cf
AMS
1168 if (pm->op_pmdynflags & PMdf_TAINTED)
1169 SvTAINTED_on(rv);
aaa362c4 1170 sv_magic(sv,(SV*)ReREFCNT_inc(PM_GETRE(pm)), PERL_MAGIC_qr,0,0);
8782bef2
GB
1171 RETURNX(PUSHs(rv));
1172}
1173
a0d0e21e
LW
1174PP(pp_match)
1175{
39644a26 1176 dSP; dTARG;
a0d0e21e 1177 register PMOP *pm = cPMOP;
d65afb4b 1178 PMOP *dynpm = pm;
a0d0e21e
LW
1179 register char *t;
1180 register char *s;
1181 char *strend;
1182 I32 global;
f722798b
IZ
1183 I32 r_flags = REXEC_CHECKED;
1184 char *truebase; /* Start of string */
aaa362c4 1185 register REGEXP *rx = PM_GETRE(pm);
b3eb6a9b 1186 bool rxtainted;
a3b680e6 1187 const I32 gimme = GIMME;
a0d0e21e 1188 STRLEN len;
748a9306 1189 I32 minmatch = 0;
a3b680e6 1190 const I32 oldsave = PL_savestack_ix;
f86702cc 1191 I32 update_minmatch = 1;
e60df1fa 1192 I32 had_zerolen = 0;
a0d0e21e 1193
533c011a 1194 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 1195 TARG = POPs;
59f00321
RGS
1196 else if (PL_op->op_private & OPpTARGET_MY)
1197 GETTARGET;
a0d0e21e 1198 else {
54b9620d 1199 TARG = DEFSV;
a0d0e21e
LW
1200 EXTEND(SP,1);
1201 }
d9f424b2 1202
c277df42 1203 PUTBACK; /* EVAL blocks need stack_sp. */
a0d0e21e
LW
1204 s = SvPV(TARG, len);
1205 strend = s + len;
1206 if (!s)
2269b42e 1207 DIE(aTHX_ "panic: pp_match");
b3eb6a9b 1208 rxtainted = ((pm->op_pmdynflags & PMdf_TAINTED) ||
3280af22 1209 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
9212bbba 1210 TAINT_NOT;
a0d0e21e 1211
a30b2f1f 1212 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 1213
d65afb4b 1214 /* PMdf_USED is set after a ?? matches once */
48c036b1 1215 if (pm->op_pmdynflags & PMdf_USED) {
c277df42 1216 failure:
a0d0e21e
LW
1217 if (gimme == G_ARRAY)
1218 RETURN;
1219 RETPUSHNO;
1220 }
1221
d65afb4b 1222 /* empty pattern special-cased to use last successful pattern if possible */
3280af22
NIS
1223 if (!rx->prelen && PL_curpm) {
1224 pm = PL_curpm;
aaa362c4 1225 rx = PM_GETRE(pm);
a0d0e21e 1226 }
d65afb4b 1227
eb160463 1228 if (rx->minlen > (I32)len)
d65afb4b 1229 goto failure;
c277df42 1230
a0d0e21e 1231 truebase = t = s;
ad94a511
IZ
1232
1233 /* XXXX What part of this is needed with true \G-support? */
d65afb4b 1234 if ((global = dynpm->op_pmflags & PMf_GLOBAL)) {
cf93c79d 1235 rx->startp[0] = -1;
a0d0e21e 1236 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
14befaf4 1237 MAGIC* mg = mg_find(TARG, PERL_MAGIC_regex_global);
565764a8 1238 if (mg && mg->mg_len >= 0) {
b7a35066 1239 if (!(rx->reganch & ROPT_GPOS_SEEN))
1c846c1f 1240 rx->endp[0] = rx->startp[0] = mg->mg_len;
0ef3e39e
HS
1241 else if (rx->reganch & ROPT_ANCH_GPOS) {
1242 r_flags |= REXEC_IGNOREPOS;
1c846c1f 1243 rx->endp[0] = rx->startp[0] = mg->mg_len;
0ef3e39e 1244 }
748a9306 1245 minmatch = (mg->mg_flags & MGf_MINMATCH);
f86702cc 1246 update_minmatch = 0;
748a9306 1247 }
a0d0e21e
LW
1248 }
1249 }
14977893
JH
1250 if ((!global && rx->nparens)
1251 || SvTEMP(TARG) || PL_sawampersand)
1252 r_flags |= REXEC_COPY_STR;
1c846c1f 1253 if (SvSCREAM(TARG))
22e551b9
IZ
1254 r_flags |= REXEC_SCREAM;
1255
a0d0e21e 1256play_it_again:
cf93c79d
IZ
1257 if (global && rx->startp[0] != -1) {
1258 t = s = rx->endp[0] + truebase;
d9f97599 1259 if ((s + rx->minlen) > strend)
a0d0e21e 1260 goto nope;
f86702cc 1261 if (update_minmatch++)
e60df1fa 1262 minmatch = had_zerolen;
a0d0e21e 1263 }
60aeb6fd
NIS
1264 if (rx->reganch & RE_USE_INTUIT &&
1265 DO_UTF8(TARG) == ((rx->reganch & ROPT_UTF8) != 0)) {
ee0b7718 1266 PL_bostr = truebase;
f722798b
IZ
1267 s = CALLREG_INTUIT_START(aTHX_ rx, TARG, s, strend, r_flags, NULL);
1268
1269 if (!s)
1270 goto nope;
1271 if ( (rx->reganch & ROPT_CHECK_ALL)
14977893 1272 && !PL_sawampersand
f722798b
IZ
1273 && ((rx->reganch & ROPT_NOSCAN)
1274 || !((rx->reganch & RE_INTUIT_TAIL)
05b4157f
GS
1275 && (r_flags & REXEC_SCREAM)))
1276 && !SvROK(TARG)) /* Cannot trust since INTUIT cannot guess ^ */
f722798b 1277 goto yup;
a0d0e21e 1278 }
cea2e8a9 1279 if (CALLREGEXEC(aTHX_ rx, s, strend, truebase, minmatch, TARG, NULL, r_flags))
bbce6d69 1280 {
3280af22 1281 PL_curpm = pm;
d65afb4b
HS
1282 if (dynpm->op_pmflags & PMf_ONCE)
1283 dynpm->op_pmdynflags |= PMdf_USED;
a0d0e21e
LW
1284 goto gotcha;
1285 }
1286 else
1287 goto ret_no;
1288 /*NOTREACHED*/
1289
1290 gotcha:
72311751
GS
1291 if (rxtainted)
1292 RX_MATCH_TAINTED_on(rx);
1293 TAINT_IF(RX_MATCH_TAINTED(rx));
a0d0e21e 1294 if (gimme == G_ARRAY) {
a3b680e6
AL
1295 const I32 nparens = rx->nparens;
1296 I32 i = (global && !nparens) ? 1 : 0;
a0d0e21e 1297
c277df42 1298 SPAGAIN; /* EVAL blocks could move the stack. */
ffc61ed2
JH
1299 EXTEND(SP, nparens + i);
1300 EXTEND_MORTAL(nparens + i);
1301 for (i = !i; i <= nparens; i++) {
a0d0e21e
LW
1302 PUSHs(sv_newmortal());
1303 /*SUPPRESS 560*/
cf93c79d 1304 if ((rx->startp[i] != -1) && rx->endp[i] != -1 ) {
b464bac0 1305 const I32 len = rx->endp[i] - rx->startp[i];
289555fe 1306 s = rx->startp[i] + truebase;
290deeac
A
1307 if (rx->endp[i] < 0 || rx->startp[i] < 0 ||
1308 len < 0 || len > strend - s)
1309 DIE(aTHX_ "panic: pp_match start/end pointers");
a0d0e21e 1310 sv_setpvn(*SP, s, len);
cce850e4 1311 if (DO_UTF8(TARG) && is_utf8_string((U8*)s, len))
a197cbdd 1312 SvUTF8_on(*SP);
a0d0e21e
LW
1313 }
1314 }
1315 if (global) {
d65afb4b 1316 if (dynpm->op_pmflags & PMf_CONTINUE) {
0af80b60
HS
1317 MAGIC* mg = 0;
1318 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
1319 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1320 if (!mg) {
1321 sv_magic(TARG, (SV*)0, PERL_MAGIC_regex_global, Nullch, 0);
1322 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1323 }
1324 if (rx->startp[0] != -1) {
1325 mg->mg_len = rx->endp[0];
1326 if (rx->startp[0] == rx->endp[0])
1327 mg->mg_flags |= MGf_MINMATCH;
1328 else
1329 mg->mg_flags &= ~MGf_MINMATCH;
1330 }
1331 }
cf93c79d
IZ
1332 had_zerolen = (rx->startp[0] != -1
1333 && rx->startp[0] == rx->endp[0]);
c277df42 1334 PUTBACK; /* EVAL blocks may use stack */
cf93c79d 1335 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
1336 goto play_it_again;
1337 }
ffc61ed2 1338 else if (!nparens)
bde848c5 1339 XPUSHs(&PL_sv_yes);
4633a7c4 1340 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1341 RETURN;
1342 }
1343 else {
1344 if (global) {
1345 MAGIC* mg = 0;
1346 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
14befaf4 1347 mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1348 if (!mg) {
14befaf4
DM
1349 sv_magic(TARG, (SV*)0, PERL_MAGIC_regex_global, Nullch, 0);
1350 mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1351 }
cf93c79d
IZ
1352 if (rx->startp[0] != -1) {
1353 mg->mg_len = rx->endp[0];
d9f97599 1354 if (rx->startp[0] == rx->endp[0])
748a9306
LW
1355 mg->mg_flags |= MGf_MINMATCH;
1356 else
1357 mg->mg_flags &= ~MGf_MINMATCH;
1358 }
a0d0e21e 1359 }
4633a7c4 1360 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1361 RETPUSHYES;
1362 }
1363
f722798b 1364yup: /* Confirmed by INTUIT */
72311751
GS
1365 if (rxtainted)
1366 RX_MATCH_TAINTED_on(rx);
1367 TAINT_IF(RX_MATCH_TAINTED(rx));
3280af22 1368 PL_curpm = pm;
d65afb4b
HS
1369 if (dynpm->op_pmflags & PMf_ONCE)
1370 dynpm->op_pmdynflags |= PMdf_USED;
cf93c79d
IZ
1371 if (RX_MATCH_COPIED(rx))
1372 Safefree(rx->subbeg);
1373 RX_MATCH_COPIED_off(rx);
1374 rx->subbeg = Nullch;
a0d0e21e 1375 if (global) {
d9f97599 1376 rx->subbeg = truebase;
cf93c79d 1377 rx->startp[0] = s - truebase;
a30b2f1f 1378 if (RX_MATCH_UTF8(rx)) {
60aeb6fd
NIS
1379 char *t = (char*)utf8_hop((U8*)s, rx->minlen);
1380 rx->endp[0] = t - truebase;
1381 }
1382 else {
1383 rx->endp[0] = s - truebase + rx->minlen;
1384 }
cf93c79d 1385 rx->sublen = strend - truebase;
a0d0e21e 1386 goto gotcha;
1c846c1f 1387 }
14977893
JH
1388 if (PL_sawampersand) {
1389 I32 off;
ed252734
NC
1390#ifdef PERL_COPY_ON_WRITE
1391 if (SvIsCOW(TARG) || (SvFLAGS(TARG) & CAN_COW_MASK) == CAN_COW_FLAGS) {
1392 if (DEBUG_C_TEST) {
1393 PerlIO_printf(Perl_debug_log,
1394 "Copy on write: pp_match $& capture, type %d, truebase=%p, t=%p, difference %d\n",
1395 (int) SvTYPE(TARG), truebase, t,
1396 (int)(t-truebase));
1397 }
1398 rx->saved_copy = sv_setsv_cow(rx->saved_copy, TARG);
aa07b2f6 1399 rx->subbeg = SvPVX_const(rx->saved_copy) + (t - truebase);
ed252734
NC
1400 assert (SvPOKp(rx->saved_copy));
1401 } else
1402#endif
1403 {
14977893 1404
ed252734
NC
1405 rx->subbeg = savepvn(t, strend - t);
1406#ifdef PERL_COPY_ON_WRITE
1407 rx->saved_copy = Nullsv;
1408#endif
1409 }
14977893
JH
1410 rx->sublen = strend - t;
1411 RX_MATCH_COPIED_on(rx);
1412 off = rx->startp[0] = s - t;
1413 rx->endp[0] = off + rx->minlen;
1414 }
1415 else { /* startp/endp are used by @- @+. */
1416 rx->startp[0] = s - truebase;
1417 rx->endp[0] = s - truebase + rx->minlen;
1418 }
2d862feb 1419 rx->nparens = rx->lastparen = rx->lastcloseparen = 0; /* used by @-, @+, and $^N */
4633a7c4 1420 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1421 RETPUSHYES;
1422
1423nope:
a0d0e21e 1424ret_no:
d65afb4b 1425 if (global && !(dynpm->op_pmflags & PMf_CONTINUE)) {
a0d0e21e 1426 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
14befaf4 1427 MAGIC* mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1428 if (mg)
565764a8 1429 mg->mg_len = -1;
a0d0e21e
LW
1430 }
1431 }
4633a7c4 1432 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1433 if (gimme == G_ARRAY)
1434 RETURN;
1435 RETPUSHNO;
1436}
1437
1438OP *
864dbfa3 1439Perl_do_readline(pTHX)
a0d0e21e 1440{
27da23d5 1441 dVAR; dSP; dTARGETSTACKED;
a0d0e21e
LW
1442 register SV *sv;
1443 STRLEN tmplen = 0;
1444 STRLEN offset;
760ac839 1445 PerlIO *fp;
a3b680e6
AL
1446 register IO * const io = GvIO(PL_last_in_gv);
1447 register const I32 type = PL_op->op_type;
1448 const I32 gimme = GIMME_V;
e79b0511 1449 MAGIC *mg;
a0d0e21e 1450
5b468f54 1451 if (io && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar))) {
e79b0511 1452 PUSHMARK(SP);
5b468f54 1453 XPUSHs(SvTIED_obj((SV*)io, mg));
e79b0511
PP
1454 PUTBACK;
1455 ENTER;
864dbfa3 1456 call_method("READLINE", gimme);
e79b0511
PP
1457 LEAVE;
1458 SPAGAIN;
0b7c7b4f
HS
1459 if (gimme == G_SCALAR) {
1460 SV* result = POPs;
1461 SvSetSV_nosteal(TARG, result);
1462 PUSHTARG;
1463 }
e79b0511
PP
1464 RETURN;
1465 }
a0d0e21e
LW
1466 fp = Nullfp;
1467 if (io) {
1468 fp = IoIFP(io);
1469 if (!fp) {
1470 if (IoFLAGS(io) & IOf_ARGV) {
1471 if (IoFLAGS(io) & IOf_START) {
a0d0e21e 1472 IoLINES(io) = 0;
3280af22 1473 if (av_len(GvAVn(PL_last_in_gv)) < 0) {
1d7c1841 1474 IoFLAGS(io) &= ~IOf_START;
9d116dd7 1475 do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,Nullfp);
3280af22
NIS
1476 sv_setpvn(GvSV(PL_last_in_gv), "-", 1);
1477 SvSETMAGIC(GvSV(PL_last_in_gv));
a2008d6d
GS
1478 fp = IoIFP(io);
1479 goto have_fp;
a0d0e21e
LW
1480 }
1481 }
3280af22 1482 fp = nextargv(PL_last_in_gv);
a0d0e21e 1483 if (!fp) { /* Note: fp != IoIFP(io) */
3280af22 1484 (void)do_close(PL_last_in_gv, FALSE); /* now it does*/
a0d0e21e
LW
1485 }
1486 }
0d44d22b
NC
1487 else if (type == OP_GLOB)
1488 fp = Perl_start_glob(aTHX_ POPs, io);
a0d0e21e
LW
1489 }
1490 else if (type == OP_GLOB)
1491 SP--;
a00b5bd3 1492 else if (ckWARN(WARN_IO) && IoTYPE(io) == IoTYPE_WRONLY) {
4c80c0b2 1493 report_evil_fh(PL_last_in_gv, io, OP_phoney_OUTPUT_ONLY);
a00b5bd3 1494 }
a0d0e21e
LW
1495 }
1496 if (!fp) {
790090df
HS
1497 if (ckWARN2(WARN_GLOB, WARN_CLOSED)
1498 && (!io || !(IoFLAGS(io) & IOf_START))) {
3f4520fe 1499 if (type == OP_GLOB)
9014280d 1500 Perl_warner(aTHX_ packWARN(WARN_GLOB),
af8c498a
GS
1501 "glob failed (can't start child: %s)",
1502 Strerror(errno));
69282e91 1503 else
bc37a18f 1504 report_evil_fh(PL_last_in_gv, io, PL_op->op_type);
3f4520fe 1505 }
54310121 1506 if (gimme == G_SCALAR) {
79628082 1507 /* undef TARG, and push that undefined value */
ba92458f
AE
1508 if (type != OP_RCATLINE) {
1509 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1510 SvOK_off(TARG);
ba92458f 1511 }
a0d0e21e
LW
1512 PUSHTARG;
1513 }
1514 RETURN;
1515 }
a2008d6d 1516 have_fp:
54310121 1517 if (gimme == G_SCALAR) {
a0d0e21e 1518 sv = TARG;
9607fc9c
PP
1519 if (SvROK(sv))
1520 sv_unref(sv);
a0d0e21e
LW
1521 (void)SvUPGRADE(sv, SVt_PV);
1522 tmplen = SvLEN(sv); /* remember if already alloced */
bc44a8a2 1523 if (!tmplen && !SvREADONLY(sv))
a0d0e21e 1524 Sv_Grow(sv, 80); /* try short-buffering it */
2b5e58c4
AMS
1525 offset = 0;
1526 if (type == OP_RCATLINE && SvOK(sv)) {
1527 if (!SvPOK(sv)) {
1528 STRLEN n_a;
1529 (void)SvPV_force(sv, n_a);
1530 }
a0d0e21e 1531 offset = SvCUR(sv);
2b5e58c4 1532 }
a0d0e21e 1533 }
54310121
PP
1534 else {
1535 sv = sv_2mortal(NEWSV(57, 80));
1536 offset = 0;
1537 }
fbad3eb5 1538
3887d568
AP
1539 /* This should not be marked tainted if the fp is marked clean */
1540#define MAYBE_TAINT_LINE(io, sv) \
1541 if (!(IoFLAGS(io) & IOf_UNTAINT)) { \
1542 TAINT; \
1543 SvTAINTED_on(sv); \
1544 }
1545
684bef36 1546/* delay EOF state for a snarfed empty file */
fbad3eb5 1547#define SNARF_EOF(gimme,rs,io,sv) \
684bef36 1548 (gimme != G_SCALAR || SvCUR(sv) \
b9fee9ba 1549 || (IoFLAGS(io) & IOf_NOLINE) || !RsSNARF(rs))
fbad3eb5 1550
a0d0e21e 1551 for (;;) {
09e8efcc 1552 PUTBACK;
fbad3eb5 1553 if (!sv_gets(sv, fp, offset)
2d726892
TF
1554 && (type == OP_GLOB
1555 || SNARF_EOF(gimme, PL_rs, io, sv)
1556 || PerlIO_error(fp)))
fbad3eb5 1557 {
760ac839 1558 PerlIO_clearerr(fp);
a0d0e21e 1559 if (IoFLAGS(io) & IOf_ARGV) {
3280af22 1560 fp = nextargv(PL_last_in_gv);
a0d0e21e
LW
1561 if (fp)
1562 continue;
3280af22 1563 (void)do_close(PL_last_in_gv, FALSE);
a0d0e21e
LW
1564 }
1565 else if (type == OP_GLOB) {
e476b1b5 1566 if (!do_close(PL_last_in_gv, FALSE) && ckWARN(WARN_GLOB)) {
9014280d 1567 Perl_warner(aTHX_ packWARN(WARN_GLOB),
4eb79ab5 1568 "glob failed (child exited with status %d%s)",
894356b3 1569 (int)(STATUS_CURRENT >> 8),
cf494569 1570 (STATUS_CURRENT & 0x80) ? ", core dumped" : "");
4eb79ab5 1571 }
a0d0e21e 1572 }
54310121 1573 if (gimme == G_SCALAR) {
ba92458f
AE
1574 if (type != OP_RCATLINE) {
1575 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1576 SvOK_off(TARG);
ba92458f 1577 }
09e8efcc 1578 SPAGAIN;
a0d0e21e
LW
1579 PUSHTARG;
1580 }
3887d568 1581 MAYBE_TAINT_LINE(io, sv);
a0d0e21e
LW
1582 RETURN;
1583 }
3887d568 1584 MAYBE_TAINT_LINE(io, sv);
a0d0e21e 1585 IoLINES(io)++;
b9fee9ba 1586 IoFLAGS(io) |= IOf_NOLINE;
71be2cbc 1587 SvSETMAGIC(sv);
09e8efcc 1588 SPAGAIN;
a0d0e21e 1589 XPUSHs(sv);
a0d0e21e
LW
1590 if (type == OP_GLOB) {
1591 char *tmps;
1592
3280af22 1593 if (SvCUR(sv) > 0 && SvCUR(PL_rs) > 0) {
c07a80fd 1594 tmps = SvEND(sv) - 1;
aa07b2f6 1595 if (*tmps == *SvPVX_const(PL_rs)) {
c07a80fd 1596 *tmps = '\0';
b162af07 1597 SvCUR_set(sv, SvCUR(sv) - 1);
c07a80fd
PP
1598 }
1599 }
a0d0e21e
LW
1600 for (tmps = SvPVX(sv); *tmps; tmps++)
1601 if (!isALPHA(*tmps) && !isDIGIT(*tmps) &&
1602 strchr("$&*(){}[]'\";\\|?<>~`", *tmps))
1603 break;
aa07b2f6 1604 if (*tmps && PerlLIO_lstat(SvPVX_const(sv), &PL_statbuf) < 0) {
a0d0e21e
LW
1605 (void)POPs; /* Unmatched wildcard? Chuck it... */
1606 continue;
1607 }
2d79bf7f 1608 } else if (SvUTF8(sv)) { /* OP_READLINE, OP_RCATLINE */
7fc63493
AL
1609 const U8 *s = (U8*)SvPVX(sv) + offset;
1610 const STRLEN len = SvCUR(sv) - offset;
1611 const U8 *f;
2d79bf7f
JH
1612
1613 if (ckWARN(WARN_UTF8) &&
1614 !Perl_is_utf8_string_loc(aTHX_ s, len, &f))
1615 /* Emulate :encoding(utf8) warning in the same case. */
1616 Perl_warner(aTHX_ packWARN(WARN_UTF8),
1617 "utf8 \"\\x%02X\" does not map to Unicode",
1618 f < (U8*)SvEND(sv) ? *f : 0);
a0d0e21e 1619 }
54310121 1620 if (gimme == G_ARRAY) {
a0d0e21e 1621 if (SvLEN(sv) - SvCUR(sv) > 20) {
1da4ca5f 1622 SvPV_shrink_to_cur(sv);
a0d0e21e
LW
1623 }
1624 sv = sv_2mortal(NEWSV(58, 80));
1625 continue;
1626 }
54310121 1627 else if (gimme == G_SCALAR && !tmplen && SvLEN(sv) - SvCUR(sv) > 80) {
a0d0e21e 1628 /* try to reclaim a bit of scalar space (only on 1st alloc) */
d5b5861b
NC
1629 const STRLEN new_len
1630 = SvCUR(sv) < 60 ? 80 : SvCUR(sv)+40; /* allow some slop */
1da4ca5f 1631 SvPV_renew(sv, new_len);
a0d0e21e
LW
1632 }
1633 RETURN;
1634 }
1635}
1636
1637PP(pp_enter)
1638{
27da23d5 1639 dVAR; dSP;
c09156bb 1640 register PERL_CONTEXT *cx;
533c011a 1641 I32 gimme = OP_GIMME(PL_op, -1);
a0d0e21e 1642
54310121
PP
1643 if (gimme == -1) {
1644 if (cxstack_ix >= 0)
1645 gimme = cxstack[cxstack_ix].blk_gimme;
1646 else
1647 gimme = G_SCALAR;
1648 }
a0d0e21e
LW
1649
1650 ENTER;
1651
1652 SAVETMPS;
924508f0 1653 PUSHBLOCK(cx, CXt_BLOCK, SP);
a0d0e21e
LW
1654
1655 RETURN;
1656}
1657
1658PP(pp_helem)
1659{
39644a26 1660 dSP;
760ac839 1661 HE* he;
ae77835f 1662 SV **svp;
a0d0e21e 1663 SV *keysv = POPs;
a0d0e21e 1664 HV *hv = (HV*)POPs;
a3b680e6
AL
1665 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
1666 const U32 defer = PL_op->op_private & OPpLVAL_DEFER;
be6c24e0 1667 SV *sv;
a3b680e6 1668 const U32 hash = (SvIsCOW_shared_hash(keysv)) ? SvUVX(keysv) : 0;
9c5ffd7c 1669 I32 preeminent = 0;
a0d0e21e 1670
ae77835f 1671 if (SvTYPE(hv) == SVt_PVHV) {
8d1f198f
DM
1672 if (PL_op->op_private & OPpLVAL_INTRO) {
1673 MAGIC *mg;
1674 HV *stash;
1675 /* does the element we're localizing already exist? */
c39e6ab0 1676 preeminent =
8d1f198f
DM
1677 /* can we determine whether it exists? */
1678 ( !SvRMAGICAL(hv)
1679 || mg_find((SV*)hv, PERL_MAGIC_env)
1680 || ( (mg = mg_find((SV*)hv, PERL_MAGIC_tied))
1681 /* Try to preserve the existenceness of a tied hash
1682 * element by using EXISTS and DELETE if possible.
1683 * Fallback to FETCH and STORE otherwise */
1684 && (stash = SvSTASH(SvRV(SvTIED_obj((SV*)hv, mg))))
1685 && gv_fetchmethod_autoload(stash, "EXISTS", TRUE)
1686 && gv_fetchmethod_autoload(stash, "DELETE", TRUE)
1687 )
1688 ) ? hv_exists_ent(hv, keysv, 0) : 1;
c39e6ab0 1689
8d1f198f 1690 }
1c846c1f 1691 he = hv_fetch_ent(hv, keysv, lval && !defer, hash);
97fcbf96 1692 svp = he ? &HeVAL(he) : 0;
ae77835f 1693 }
c750a3ec 1694 else {
a0d0e21e 1695 RETPUSHUNDEF;
c750a3ec 1696 }
a0d0e21e 1697 if (lval) {
3280af22 1698 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
1699 SV* lv;
1700 SV* key2;
2d8e6c8d 1701 if (!defer) {
ce5030a2 1702 DIE(aTHX_ PL_no_helem_sv, keysv);
2d8e6c8d 1703 }
68dc0745
PP
1704 lv = sv_newmortal();
1705 sv_upgrade(lv, SVt_PVLV);
1706 LvTYPE(lv) = 'y';
14befaf4 1707 sv_magic(lv, key2 = newSVsv(keysv), PERL_MAGIC_defelem, Nullch, 0);
68dc0745
PP
1708 SvREFCNT_dec(key2); /* sv_magic() increments refcount */
1709 LvTARG(lv) = SvREFCNT_inc(hv);
1710 LvTARGLEN(lv) = 1;
1711 PUSHs(lv);
1712 RETURN;
1713 }
533c011a 1714 if (PL_op->op_private & OPpLVAL_INTRO) {
bfcb3514 1715 if (HvNAME_get(hv) && isGV(*svp))
533c011a 1716 save_gp((GV*)*svp, !(PL_op->op_flags & OPf_SPECIAL));
1f5346dc
SC
1717 else {
1718 if (!preeminent) {
1719 STRLEN keylen;
a3b680e6 1720 const char * const key = SvPV(keysv, keylen);
57813020 1721 SAVEDELETE(hv, savepvn(key,keylen), keylen);
bfc4de9f 1722 } else
1f5346dc
SC
1723 save_helem(hv, keysv, svp);
1724 }
5f05dabc 1725 }
533c011a
NIS
1726 else if (PL_op->op_private & OPpDEREF)
1727 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 1728 }
3280af22 1729 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
1730 /* This makes C<local $tied{foo} = $tied{foo}> possible.
1731 * Pushing the magical RHS on to the stack is useless, since
1732 * that magic is soon destined to be misled by the local(),
1733 * and thus the later pp_sassign() will fail to mg_get() the
1734 * old value. This should also cure problems with delayed
1735 * mg_get()s. GSAR 98-07-03 */
1736 if (!lval && SvGMAGICAL(sv))
1737 sv = sv_mortalcopy(sv);
1738 PUSHs(sv);
a0d0e21e
LW
1739 RETURN;
1740}
1741
1742PP(pp_leave)
1743{
27da23d5 1744 dVAR; dSP;
c09156bb 1745 register PERL_CONTEXT *cx;
a0d0e21e
LW
1746 SV **newsp;
1747 PMOP *newpm;
1748 I32 gimme;
1749
533c011a 1750 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e 1751 cx = &cxstack[cxstack_ix];
3280af22 1752 cx->blk_oldpm = PL_curpm; /* fake block should preserve $1 et al */
a0d0e21e
LW
1753 }
1754
1755 POPBLOCK(cx,newpm);
1756
533c011a 1757 gimme = OP_GIMME(PL_op, -1);
54310121
PP
1758 if (gimme == -1) {
1759 if (cxstack_ix >= 0)
1760 gimme = cxstack[cxstack_ix].blk_gimme;
1761 else
1762 gimme = G_SCALAR;
1763 }
a0d0e21e 1764
a1f49e72 1765 TAINT_NOT;
54310121
PP
1766 if (gimme == G_VOID)
1767 SP = newsp;
1768 else if (gimme == G_SCALAR) {
a3b680e6 1769 register SV **mark;
54310121 1770 MARK = newsp + 1;
09256e2f 1771 if (MARK <= SP) {
54310121
PP
1772 if (SvFLAGS(TOPs) & (SVs_PADTMP|SVs_TEMP))
1773 *MARK = TOPs;
1774 else
1775 *MARK = sv_mortalcopy(TOPs);
09256e2f 1776 } else {
54310121 1777 MEXTEND(mark,0);
3280af22 1778 *MARK = &PL_sv_undef;
a0d0e21e 1779 }
54310121 1780 SP = MARK;
a0d0e21e 1781 }
54310121 1782 else if (gimme == G_ARRAY) {
a1f49e72 1783 /* in case LEAVE wipes old return values */
a3b680e6 1784 register SV **mark;
a1f49e72
CS
1785 for (mark = newsp + 1; mark <= SP; mark++) {
1786 if (!(SvFLAGS(*mark) & (SVs_PADTMP|SVs_TEMP))) {
a0d0e21e 1787 *mark = sv_mortalcopy(*mark);
a1f49e72
CS
1788 TAINT_NOT; /* Each item is independent */
1789 }
1790 }
a0d0e21e 1791 }
3280af22 1792 PL_curpm = newpm; /* Don't pop $1 et al till now */
a0d0e21e
LW
1793
1794 LEAVE;
1795
1796 RETURN;
1797}
1798
1799PP(pp_iter)
1800{
39644a26 1801 dSP;
c09156bb 1802 register PERL_CONTEXT *cx;
dc09a129 1803 SV *sv, *oldsv;
4633a7c4 1804 AV* av;
1d7c1841 1805 SV **itersvp;
a0d0e21e 1806
924508f0 1807 EXTEND(SP, 1);
a0d0e21e 1808 cx = &cxstack[cxstack_ix];
6b35e009 1809 if (CxTYPE(cx) != CXt_LOOP)
cea2e8a9 1810 DIE(aTHX_ "panic: pp_iter");
a0d0e21e 1811
1d7c1841 1812 itersvp = CxITERVAR(cx);
4633a7c4 1813 av = cx->blk_loop.iterary;
89ea2908
GA
1814 if (SvTYPE(av) != SVt_PVAV) {
1815 /* iterate ($min .. $max) */
1816 if (cx->blk_loop.iterlval) {
1817 /* string increment */
1818 register SV* cur = cx->blk_loop.iterlval;
4fe3f0fa 1819 STRLEN maxlen = 0;
e1ec3a88 1820 const char *max = SvOK((SV*)av) ? SvPV((SV*)av, maxlen) : "";
89ea2908 1821 if (!SvNIOK(cur) && SvCUR(cur) <= maxlen) {
1d7c1841 1822 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1823 /* safe to reuse old SV */
1d7c1841 1824 sv_setsv(*itersvp, cur);
eaa5c2d6 1825 }
1c846c1f 1826 else
eaa5c2d6
GA
1827 {
1828 /* we need a fresh SV every time so that loop body sees a
1829 * completely new SV for closures/references to work as
1830 * they used to */
dc09a129 1831 oldsv = *itersvp;
1d7c1841 1832 *itersvp = newSVsv(cur);
dc09a129 1833 SvREFCNT_dec(oldsv);
eaa5c2d6 1834 }
aa07b2f6 1835 if (strEQ(SvPVX_const(cur), max))
89ea2908
GA
1836 sv_setiv(cur, 0); /* terminate next time */
1837 else
1838 sv_inc(cur);
1839 RETPUSHYES;
1840 }
1841 RETPUSHNO;
1842 }
1843 /* integer increment */
1844 if (cx->blk_loop.iterix > cx->blk_loop.itermax)
1845 RETPUSHNO;
7f61b687 1846
3db8f154 1847 /* don't risk potential race */
1d7c1841 1848 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1849 /* safe to reuse old SV */
1d7c1841 1850 sv_setiv(*itersvp, cx->blk_loop.iterix++);
eaa5c2d6 1851 }
1c846c1f 1852 else
eaa5c2d6
GA
1853 {
1854 /* we need a fresh SV every time so that loop body sees a
1855 * completely new SV for closures/references to work as they
1856 * used to */
dc09a129 1857 oldsv = *itersvp;
1d7c1841 1858 *itersvp = newSViv(cx->blk_loop.iterix++);
dc09a129 1859 SvREFCNT_dec(oldsv);
eaa5c2d6 1860 }
89ea2908
GA
1861 RETPUSHYES;
1862 }
1863
1864 /* iterate array */
ef3e5ea9
NC
1865 if (PL_op->op_private & OPpITER_REVERSED) {
1866 /* In reverse, use itermax as the min :-) */
c491ecac 1867 if (cx->blk_loop.iterix <= cx->blk_loop.itermax)
ef3e5ea9 1868 RETPUSHNO;
a0d0e21e 1869
ef3e5ea9
NC
1870 if (SvMAGICAL(av) || AvREIFY(av)) {
1871 SV **svp = av_fetch(av, cx->blk_loop.iterix--, FALSE);
1872 if (svp)
1873 sv = *svp;
1874 else
1875 sv = Nullsv;
1876 }
1877 else {
1878 sv = AvARRAY(av)[cx->blk_loop.iterix--];
1879 }
d42935ef
JH
1880 }
1881 else {
ef3e5ea9
NC
1882 if (cx->blk_loop.iterix >= (av == PL_curstack ? cx->blk_oldsp :
1883 AvFILL(av)))
1884 RETPUSHNO;
1885
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 }
d42935ef 1896 }
ef3e5ea9 1897
cccede53
DM
1898 if (sv && SvREFCNT(sv) == 0) {
1899 *itersvp = Nullsv;
b6c83531 1900 Perl_croak(aTHX_ "Use of freed value in iteration");
cccede53
DM
1901 }
1902
d42935ef 1903 if (sv)
a0d0e21e 1904 SvTEMP_off(sv);
a0d0e21e 1905 else
3280af22 1906 sv = &PL_sv_undef;
8b530633 1907 if (av != PL_curstack && sv == &PL_sv_undef) {
5f05dabc 1908 SV *lv = cx->blk_loop.iterlval;
71be2cbc
PP
1909 if (lv && SvREFCNT(lv) > 1) {
1910 SvREFCNT_dec(lv);
1911 lv = Nullsv;
1912 }
5f05dabc
PP
1913 if (lv)
1914 SvREFCNT_dec(LvTARG(lv));
1915 else {
68dc0745 1916 lv = cx->blk_loop.iterlval = NEWSV(26, 0);
5f05dabc 1917 sv_upgrade(lv, SVt_PVLV);
5f05dabc 1918 LvTYPE(lv) = 'y';
14befaf4 1919 sv_magic(lv, Nullsv, PERL_MAGIC_defelem, Nullch, 0);
5f05dabc
PP
1920 }
1921 LvTARG(lv) = SvREFCNT_inc(av);
1922 LvTARGOFF(lv) = cx->blk_loop.iterix;
42718184 1923 LvTARGLEN(lv) = (STRLEN)UV_MAX;
5f05dabc
PP
1924 sv = (SV*)lv;
1925 }
a0d0e21e 1926
dc09a129 1927 oldsv = *itersvp;
1d7c1841 1928 *itersvp = SvREFCNT_inc(sv);
dc09a129
DM
1929 SvREFCNT_dec(oldsv);
1930
a0d0e21e
LW
1931 RETPUSHYES;
1932}
1933
1934PP(pp_subst)
1935{
39644a26 1936 dSP; dTARG;
a0d0e21e
LW
1937 register PMOP *pm = cPMOP;
1938 PMOP *rpm = pm;
1939 register SV *dstr;
1940 register char *s;
1941 char *strend;
1942 register char *m;
1943 char *c;
1944 register char *d;
1945 STRLEN clen;
1946 I32 iters = 0;
1947 I32 maxiters;
1948 register I32 i;
1949 bool once;
71be2cbc 1950 bool rxtainted;
a0d0e21e 1951 char *orig;
22e551b9 1952 I32 r_flags;
aaa362c4 1953 register REGEXP *rx = PM_GETRE(pm);
a0d0e21e
LW
1954 STRLEN len;
1955 int force_on_match = 0;
3280af22 1956 I32 oldsave = PL_savestack_ix;
792b2c16 1957 STRLEN slen;
f272994b 1958 bool doutf8 = FALSE;
ed252734
NC
1959#ifdef PERL_COPY_ON_WRITE
1960 bool is_cow;
1961#endif
db79b45b 1962 SV *nsv = Nullsv;
a0d0e21e 1963
5cd24f17
PP
1964 /* known replacement string? */
1965 dstr = (pm->op_pmflags & PMf_CONST) ? POPs : Nullsv;
533c011a 1966 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 1967 TARG = POPs;
59f00321
RGS
1968 else if (PL_op->op_private & OPpTARGET_MY)
1969 GETTARGET;
a0d0e21e 1970 else {
54b9620d 1971 TARG = DEFSV;
a0d0e21e 1972 EXTEND(SP,1);
1c846c1f 1973 }
d9f424b2 1974
ed252734
NC
1975#ifdef PERL_COPY_ON_WRITE
1976 /* Awooga. Awooga. "bool" types that are actually char are dangerous,
1977 because they make integers such as 256 "false". */
1978 is_cow = SvIsCOW(TARG) ? TRUE : FALSE;
1979#else
765f542d
NC
1980 if (SvIsCOW(TARG))
1981 sv_force_normal_flags(TARG,0);
ed252734
NC
1982#endif
1983 if (
1984#ifdef PERL_COPY_ON_WRITE
1985 !is_cow &&
1986#endif
1987 (SvREADONLY(TARG)
4ce457a6
TP
1988 || ( (SvTYPE(TARG) == SVt_PVGV || SvTYPE(TARG) > SVt_PVLV)
1989 && !(SvTYPE(TARG) == SVt_PVGV && SvFAKE(TARG)))))
d470f89e 1990 DIE(aTHX_ PL_no_modify);
8ec5e241
NIS
1991 PUTBACK;
1992
a0d0e21e 1993 s = SvPV(TARG, len);
68dc0745 1994 if (!SvPOKp(TARG) || SvTYPE(TARG) == SVt_PVGV)
a0d0e21e 1995 force_on_match = 1;
b3eb6a9b 1996 rxtainted = ((pm->op_pmdynflags & PMdf_TAINTED) ||
3280af22
NIS
1997 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
1998 if (PL_tainted)
b3eb6a9b 1999 rxtainted |= 2;
9212bbba 2000 TAINT_NOT;
a12c0f56 2001
a30b2f1f 2002 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 2003
a0d0e21e
LW
2004 force_it:
2005 if (!pm || !s)
2269b42e 2006 DIE(aTHX_ "panic: pp_subst");
a0d0e21e
LW
2007
2008 strend = s + len;
a30b2f1f 2009 slen = RX_MATCH_UTF8(rx) ? utf8_length((U8*)s, (U8*)strend) : len;
792b2c16
JH
2010 maxiters = 2 * slen + 10; /* We can match twice at each
2011 position, once with zero-length,
2012 second time with non-zero. */
a0d0e21e 2013
3280af22
NIS
2014 if (!rx->prelen && PL_curpm) {
2015 pm = PL_curpm;
aaa362c4 2016 rx = PM_GETRE(pm);
a0d0e21e 2017 }
22e551b9 2018 r_flags = (rx->nparens || SvTEMP(TARG) || PL_sawampersand)
ed252734 2019 ? REXEC_COPY_STR : 0;
f722798b 2020 if (SvSCREAM(TARG))
22e551b9 2021 r_flags |= REXEC_SCREAM;
7fba1cd6 2022
a0d0e21e 2023 orig = m = s;
f722798b 2024 if (rx->reganch & RE_USE_INTUIT) {
ee0b7718 2025 PL_bostr = orig;
f722798b
IZ
2026 s = CALLREG_INTUIT_START(aTHX_ rx, TARG, s, strend, r_flags, NULL);
2027
2028 if (!s)
2029 goto nope;
2030 /* How to do it in subst? */
2031/* if ( (rx->reganch & ROPT_CHECK_ALL)
1c846c1f 2032 && !PL_sawampersand
f722798b
IZ
2033 && ((rx->reganch & ROPT_NOSCAN)
2034 || !((rx->reganch & RE_INTUIT_TAIL)
2035 && (r_flags & REXEC_SCREAM))))
2036 goto yup;
2037*/
a0d0e21e 2038 }
71be2cbc
PP
2039
2040 /* only replace once? */
a0d0e21e 2041 once = !(rpm->op_pmflags & PMf_GLOBAL);
71be2cbc
PP
2042
2043 /* known replacement string? */
f272994b 2044 if (dstr) {
8514a05a
JH
2045 /* replacement needing upgrading? */
2046 if (DO_UTF8(TARG) && !doutf8) {
db79b45b 2047 nsv = sv_newmortal();
4a176938 2048 SvSetSV(nsv, dstr);
8514a05a
JH
2049 if (PL_encoding)
2050 sv_recode_to_utf8(nsv, PL_encoding);
2051 else
2052 sv_utf8_upgrade(nsv);
2053 c = SvPV(nsv, clen);
4a176938
JH
2054 doutf8 = TRUE;
2055 }
2056 else {
2057 c = SvPV(dstr, clen);
2058 doutf8 = DO_UTF8(dstr);
8514a05a 2059 }
f272994b
A
2060 }
2061 else {
2062 c = Nullch;
2063 doutf8 = FALSE;
2064 }
2065
71be2cbc 2066 /* can do inplace substitution? */
ed252734
NC
2067 if (c
2068#ifdef PERL_COPY_ON_WRITE
2069 && !is_cow
2070#endif
2071 && (I32)clen <= rx->minlen && (once || !(r_flags & REXEC_COPY_STR))
db79b45b
JH
2072 && !(rx->reganch & ROPT_LOOKBEHIND_SEEN)
2073 && (!doutf8 || SvUTF8(TARG))) {
f722798b
IZ
2074 if (!CALLREGEXEC(aTHX_ rx, s, strend, orig, 0, TARG, NULL,
2075 r_flags | REXEC_CHECKED))
2076 {
8ec5e241 2077 SPAGAIN;
3280af22 2078 PUSHs(&PL_sv_no);
71be2cbc
PP
2079 LEAVE_SCOPE(oldsave);
2080 RETURN;
2081 }
ed252734
NC
2082#ifdef PERL_COPY_ON_WRITE
2083 if (SvIsCOW(TARG)) {
2084 assert (!force_on_match);
2085 goto have_a_cow;
2086 }
2087#endif
71be2cbc
PP
2088 if (force_on_match) {
2089 force_on_match = 0;
2090 s = SvPV_force(TARG, len);
2091 goto force_it;
2092 }
71be2cbc 2093 d = s;
3280af22 2094 PL_curpm = pm;
71be2cbc
PP
2095 SvSCREAM_off(TARG); /* disable possible screamer */
2096 if (once) {
48c036b1 2097 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d
IZ
2098 m = orig + rx->startp[0];
2099 d = orig + rx->endp[0];
71be2cbc
PP
2100 s = orig;
2101 if (m - s > strend - d) { /* faster to shorten from end */
2102 if (clen) {
2103 Copy(c, m, clen, char);
2104 m += clen;
a0d0e21e 2105 }
71be2cbc
PP
2106 i = strend - d;
2107 if (i > 0) {
2108 Move(d, m, i, char);
2109 m += i;
a0d0e21e 2110 }
71be2cbc
PP
2111 *m = '\0';
2112 SvCUR_set(TARG, m - s);
2113 }
2114 /*SUPPRESS 560*/
155aba94 2115 else if ((i = m - s)) { /* faster from front */
71be2cbc
PP
2116 d -= clen;
2117 m = d;
2118 sv_chop(TARG, d-i);
2119 s += i;
2120 while (i--)
2121 *--d = *--s;
2122 if (clen)
2123 Copy(c, m, clen, char);
2124 }
2125 else if (clen) {
2126 d -= clen;
2127 sv_chop(TARG, d);
2128 Copy(c, d, clen, char);
2129 }
2130 else {
2131 sv_chop(TARG, d);
2132 }
48c036b1 2133 TAINT_IF(rxtainted & 1);
8ec5e241 2134 SPAGAIN;
3280af22 2135 PUSHs(&PL_sv_yes);
71be2cbc
PP
2136 }
2137 else {
71be2cbc
PP
2138 do {
2139 if (iters++ > maxiters)
cea2e8a9 2140 DIE(aTHX_ "Substitution loop");
d9f97599 2141 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d 2142 m = rx->startp[0] + orig;
71be2cbc 2143 /*SUPPRESS 560*/
155aba94 2144 if ((i = m - s)) {
71be2cbc
PP
2145 if (s != d)
2146 Move(s, d, i, char);
2147 d += i;
a0d0e21e 2148 }
71be2cbc
PP
2149 if (clen) {
2150 Copy(c, d, clen, char);
2151 d += clen;
2152 }
cf93c79d 2153 s = rx->endp[0] + orig;
cea2e8a9 2154 } while (CALLREGEXEC(aTHX_ rx, s, strend, orig, s == m,
f722798b
IZ
2155 TARG, NULL,
2156 /* don't match same null twice */
2157 REXEC_NOT_FIRST|REXEC_IGNOREPOS));
71be2cbc
PP
2158 if (s != d) {
2159 i = strend - s;
aa07b2f6 2160 SvCUR_set(TARG, d - SvPVX_const(TARG) + i);
71be2cbc 2161 Move(s, d, i+1, char); /* include the NUL */
a0d0e21e 2162 }
48c036b1 2163 TAINT_IF(rxtainted & 1);
8ec5e241 2164 SPAGAIN;
71be2cbc 2165 PUSHs(sv_2mortal(newSViv((I32)iters)));
a0d0e21e 2166 }
80b498e0 2167 (void)SvPOK_only_UTF8(TARG);
48c036b1 2168 TAINT_IF(rxtainted);
8ec5e241
NIS
2169 if (SvSMAGICAL(TARG)) {
2170 PUTBACK;
2171 mg_set(TARG);
2172 SPAGAIN;
2173 }
9212bbba 2174 SvTAINT(TARG);
aefe6dfc
JH
2175 if (doutf8)
2176 SvUTF8_on(TARG);
71be2cbc
PP
2177 LEAVE_SCOPE(oldsave);
2178 RETURN;
a0d0e21e 2179 }
71be2cbc 2180
f722798b
IZ
2181 if (CALLREGEXEC(aTHX_ rx, s, strend, orig, 0, TARG, NULL,
2182 r_flags | REXEC_CHECKED))
2183 {
a0d0e21e
LW
2184 if (force_on_match) {
2185 force_on_match = 0;
2186 s = SvPV_force(TARG, len);
2187 goto force_it;
2188 }
ed252734
NC
2189#ifdef PERL_COPY_ON_WRITE
2190 have_a_cow:
2191#endif
48c036b1 2192 rxtainted |= RX_MATCH_TAINTED(rx);
f2b990bf 2193 dstr = newSVpvn(m, s-m);
ffc61ed2
JH
2194 if (DO_UTF8(TARG))
2195 SvUTF8_on(dstr);
3280af22 2196 PL_curpm = pm;
a0d0e21e 2197 if (!c) {
c09156bb 2198 register PERL_CONTEXT *cx;
8ec5e241 2199 SPAGAIN;
d8f2cf8a 2200 ReREFCNT_inc(rx);
a0d0e21e
LW
2201 PUSHSUBST(cx);
2202 RETURNOP(cPMOP->op_pmreplroot);
2203 }
cf93c79d 2204 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
2205 do {
2206 if (iters++ > maxiters)
cea2e8a9 2207 DIE(aTHX_ "Substitution loop");
d9f97599 2208 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d 2209 if (RX_MATCH_COPIED(rx) && rx->subbeg != orig) {
a0d0e21e
LW
2210 m = s;
2211 s = orig;
cf93c79d 2212 orig = rx->subbeg;
a0d0e21e
LW
2213 s = orig + (m - s);
2214 strend = s + (strend - m);
2215 }
cf93c79d 2216 m = rx->startp[0] + orig;
db79b45b
JH
2217 if (doutf8 && !SvUTF8(dstr))
2218 sv_catpvn_utf8_upgrade(dstr, s, m - s, nsv);
2219 else
2220 sv_catpvn(dstr, s, m-s);
cf93c79d 2221 s = rx->endp[0] + orig;
a0d0e21e
LW
2222 if (clen)
2223 sv_catpvn(dstr, c, clen);
2224 if (once)
2225 break;
ffc61ed2
JH
2226 } while (CALLREGEXEC(aTHX_ rx, s, strend, orig, s == m,
2227 TARG, NULL, r_flags));
db79b45b
JH
2228 if (doutf8 && !DO_UTF8(TARG))
2229 sv_catpvn_utf8_upgrade(dstr, s, strend - s, nsv);
89afcb60
A
2230 else
2231 sv_catpvn(dstr, s, strend - s);
748a9306 2232
ed252734
NC
2233#ifdef PERL_COPY_ON_WRITE
2234 /* The match may make the string COW. If so, brilliant, because that's
2235 just saved us one malloc, copy and free - the regexp has donated
2236 the old buffer, and we malloc an entirely new one, rather than the
2237 regexp malloc()ing a buffer and copying our original, only for
2238 us to throw it away here during the substitution. */
2239 if (SvIsCOW(TARG)) {
2240 sv_force_normal_flags(TARG, SV_COW_DROP_PV);
2241 } else
2242#endif
2243 {
8bd4d4c5 2244 SvPV_free(TARG);
ed252734 2245 }
f880fe2f 2246 SvPV_set(TARG, SvPVX(dstr));
748a9306
LW
2247 SvCUR_set(TARG, SvCUR(dstr));
2248 SvLEN_set(TARG, SvLEN(dstr));
f272994b 2249 doutf8 |= DO_UTF8(dstr);
f880fe2f 2250 SvPV_set(dstr, (char*)0);
748a9306
LW
2251 sv_free(dstr);
2252
48c036b1 2253 TAINT_IF(rxtainted & 1);
f878fbec 2254 SPAGAIN;
48c036b1
GS
2255 PUSHs(sv_2mortal(newSViv((I32)iters)));
2256
a0d0e21e 2257 (void)SvPOK_only(TARG);
f272994b 2258 if (doutf8)
60aeb6fd 2259 SvUTF8_on(TARG);
48c036b1 2260 TAINT_IF(rxtainted);
a0d0e21e 2261 SvSETMAGIC(TARG);
9212bbba 2262 SvTAINT(TARG);
4633a7c4 2263 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2264 RETURN;
2265 }
5cd24f17 2266 goto ret_no;
a0d0e21e
LW
2267
2268nope:
1c846c1f 2269ret_no:
8ec5e241 2270 SPAGAIN;
3280af22 2271 PUSHs(&PL_sv_no);
4633a7c4 2272 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2273 RETURN;
2274}
2275
2276PP(pp_grepwhile)
2277{
27da23d5 2278 dVAR; dSP;
a0d0e21e
LW
2279
2280 if (SvTRUEx(POPs))
3280af22
NIS
2281 PL_stack_base[PL_markstack_ptr[-1]++] = PL_stack_base[*PL_markstack_ptr];
2282 ++*PL_markstack_ptr;
a0d0e21e
LW
2283 LEAVE; /* exit inner scope */
2284
2285 /* All done yet? */
3280af22 2286 if (PL_stack_base + *PL_markstack_ptr > SP) {
a0d0e21e 2287 I32 items;
54310121 2288 I32 gimme = GIMME_V;
a0d0e21e
LW
2289
2290 LEAVE; /* exit outer scope */
2291 (void)POPMARK; /* pop src */
3280af22 2292 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 2293 (void)POPMARK; /* pop dst */
3280af22 2294 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 2295 if (gimme == G_SCALAR) {
7cc47870
RGS
2296 if (PL_op->op_private & OPpGREP_LEX) {
2297 SV* sv = sv_newmortal();
2298 sv_setiv(sv, items);
2299 PUSHs(sv);
2300 }
2301 else {
2302 dTARGET;
2303 XPUSHi(items);
2304 }
a0d0e21e 2305 }
54310121
PP
2306 else if (gimme == G_ARRAY)
2307 SP += items;
a0d0e21e
LW
2308 RETURN;
2309 }
2310 else {
2311 SV *src;
2312
2313 ENTER; /* enter inner scope */
1d7c1841 2314 SAVEVPTR(PL_curpm);
a0d0e21e 2315
3280af22 2316 src = PL_stack_base[*PL_markstack_ptr];
a0d0e21e 2317 SvTEMP_off(src);
59f00321
RGS
2318 if (PL_op->op_private & OPpGREP_LEX)
2319 PAD_SVl(PL_op->op_targ) = src;
2320 else
2321 DEFSV = src;
a0d0e21e
LW
2322
2323 RETURNOP(cLOGOP->op_other);
2324 }
2325}
2326
2327PP(pp_leavesub)
2328{
27da23d5 2329 dVAR; dSP;
a0d0e21e
LW
2330 SV **mark;
2331 SV **newsp;
2332 PMOP *newpm;
2333 I32 gimme;
c09156bb 2334 register PERL_CONTEXT *cx;
b0d9ce38 2335 SV *sv;
a0d0e21e
LW
2336
2337 POPBLOCK(cx,newpm);
5dd42e15 2338 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2339
a1f49e72 2340 TAINT_NOT;
a0d0e21e
LW
2341 if (gimme == G_SCALAR) {
2342 MARK = newsp + 1;
a29cdaf0 2343 if (MARK <= SP) {
a8bba7fa 2344 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
a29cdaf0
IZ
2345 if (SvTEMP(TOPs)) {
2346 *MARK = SvREFCNT_inc(TOPs);
2347 FREETMPS;
2348 sv_2mortal(*MARK);
cd06dffe
GS
2349 }
2350 else {
959e3673 2351 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
a29cdaf0 2352 FREETMPS;
959e3673
GS
2353 *MARK = sv_mortalcopy(sv);
2354 SvREFCNT_dec(sv);
a29cdaf0 2355 }
cd06dffe
GS
2356 }
2357 else
a29cdaf0 2358 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
cd06dffe
GS
2359 }
2360 else {
f86702cc 2361 MEXTEND(MARK, 0);
3280af22 2362 *MARK = &PL_sv_undef;
a0d0e21e
LW
2363 }
2364 SP = MARK;
2365 }
54310121 2366 else if (gimme == G_ARRAY) {
f86702cc 2367 for (MARK = newsp + 1; MARK <= SP; MARK++) {
a1f49e72 2368 if (!SvTEMP(*MARK)) {
f86702cc 2369 *MARK = sv_mortalcopy(*MARK);
a1f49e72
CS
2370 TAINT_NOT; /* Each item is independent */
2371 }
f86702cc 2372 }
a0d0e21e 2373 }
f86702cc 2374 PUTBACK;
1c846c1f 2375
5dd42e15
DM
2376 LEAVE;
2377 cxstack_ix--;
b0d9ce38 2378 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
3280af22 2379 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e 2380
b0d9ce38 2381 LEAVESUB(sv);
f39bc417 2382 return cx->blk_sub.retop;
a0d0e21e
LW
2383}
2384
cd06dffe
GS
2385/* This duplicates the above code because the above code must not
2386 * get any slower by more conditions */
2387PP(pp_leavesublv)
2388{
27da23d5 2389 dVAR; dSP;
cd06dffe
GS
2390 SV **mark;
2391 SV **newsp;
2392 PMOP *newpm;
2393 I32 gimme;
2394 register PERL_CONTEXT *cx;
b0d9ce38 2395 SV *sv;
cd06dffe
GS
2396
2397 POPBLOCK(cx,newpm);
5dd42e15 2398 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2399
cd06dffe
GS
2400 TAINT_NOT;
2401
2402 if (cx->blk_sub.lval & OPpENTERSUB_INARGS) {
2403 /* We are an argument to a function or grep().
2404 * This kind of lvalueness was legal before lvalue
2405 * subroutines too, so be backward compatible:
2406 * cannot report errors. */
2407
2408 /* Scalar context *is* possible, on the LHS of -> only,
2409 * as in f()->meth(). But this is not an lvalue. */
2410 if (gimme == G_SCALAR)
2411 goto temporise;
2412 if (gimme == G_ARRAY) {
a8bba7fa 2413 if (!CvLVALUE(cx->blk_sub.cv))
cd06dffe
GS
2414 goto temporise_array;
2415 EXTEND_MORTAL(SP - newsp);
2416 for (mark = newsp + 1; mark <= SP; mark++) {
2417 if (SvTEMP(*mark))
2418 /* empty */ ;
2419 else if (SvFLAGS(*mark) & (SVs_PADTMP | SVf_READONLY))
2420 *mark = sv_mortalcopy(*mark);
2421 else {
2422 /* Can be a localized value subject to deletion. */
2423 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2424 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2425 }
2426 }
2427 }
2428 }
2429 else if (cx->blk_sub.lval) { /* Leave it as it is if we can. */
2430 /* Here we go for robustness, not for speed, so we change all
2431 * the refcounts so the caller gets a live guy. Cannot set
2432 * TEMP, so sv_2mortal is out of question. */
a8bba7fa 2433 if (!CvLVALUE(cx->blk_sub.cv)) {
5dd42e15
DM
2434 LEAVE;
2435 cxstack_ix--;
b0d9ce38 2436 POPSUB(cx,sv);
d470f89e 2437 PL_curpm = newpm;
b0d9ce38 2438 LEAVESUB(sv);
d470f89e
GS
2439 DIE(aTHX_ "Can't modify non-lvalue subroutine call");
2440 }
cd06dffe
GS
2441 if (gimme == G_SCALAR) {
2442 MARK = newsp + 1;
2443 EXTEND_MORTAL(1);
2444 if (MARK == SP) {
d470f89e 2445 if (SvFLAGS(TOPs) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
5dd42e15
DM
2446 LEAVE;
2447 cxstack_ix--;
b0d9ce38 2448 POPSUB(cx,sv);
d470f89e 2449 PL_curpm = newpm;
b0d9ce38 2450 LEAVESUB(sv);
e9f19e3c
HS
2451 DIE(aTHX_ "Can't return %s from lvalue subroutine",
2452 SvREADONLY(TOPs) ? (TOPs == &PL_sv_undef) ? "undef"
2453 : "a readonly value" : "a temporary");
d470f89e 2454 }
cd06dffe
GS
2455 else { /* Can be a localized value
2456 * subject to deletion. */
2457 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2458 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2459 }
2460 }
d470f89e 2461 else { /* Should not happen? */
5dd42e15
DM
2462 LEAVE;
2463 cxstack_ix--;
b0d9ce38 2464 POPSUB(cx,sv);
d470f89e 2465 PL_curpm = newpm;
b0d9ce38 2466 LEAVESUB(sv);
d470f89e 2467 DIE(aTHX_ "%s returned from lvalue subroutine in scalar context",
cd06dffe 2468 (MARK > SP ? "Empty array" : "Array"));
d470f89e 2469 }
cd06dffe
GS
2470 SP = MARK;
2471 }
2472 else if (gimme == G_ARRAY) {
2473 EXTEND_MORTAL(SP - newsp);
2474 for (mark = newsp + 1; mark <= SP; mark++) {
f206cdda
AMS
2475 if (*mark != &PL_sv_undef
2476 && SvFLAGS(*mark) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
d470f89e
GS
2477 /* Might be flattened array after $#array = */
2478 PUTBACK;
5dd42e15
DM
2479 LEAVE;
2480 cxstack_ix--;
b0d9ce38 2481 POPSUB(cx,sv);
d470f89e 2482 PL_curpm = newpm;
b0d9ce38 2483 LEAVESUB(sv);
f206cdda
AMS
2484 DIE(aTHX_ "Can't return a %s from lvalue subroutine",
2485 SvREADONLY(TOPs) ? "readonly value" : "temporary");
d470f89e 2486 }
cd06dffe 2487 else {
cd06dffe
GS
2488 /* Can be a localized value subject to deletion. */
2489 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2490 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2491 }
2492 }
2493 }
2494 }
2495 else {
2496 if (gimme == G_SCALAR) {
2497 temporise:
2498 MARK = newsp + 1;
2499 if (MARK <= SP) {
a8bba7fa 2500 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
cd06dffe
GS
2501 if (SvTEMP(TOPs)) {
2502 *MARK = SvREFCNT_inc(TOPs);
2503 FREETMPS;
2504 sv_2mortal(*MARK);
2505 }
2506 else {
959e3673 2507 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
cd06dffe 2508 FREETMPS;
959e3673
GS
2509 *MARK = sv_mortalcopy(sv);
2510 SvREFCNT_dec(sv);
cd06dffe
GS
2511 }
2512 }
2513 else
2514 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
2515 }
2516 else {
2517 MEXTEND(MARK, 0);
2518 *MARK = &PL_sv_undef;
2519 }
2520 SP = MARK;
2521 }
2522 else if (gimme == G_ARRAY) {
2523 temporise_array:
2524 for (MARK = newsp + 1; MARK <= SP; MARK++) {
2525 if (!SvTEMP(*MARK)) {
2526 *MARK = sv_mortalcopy(*MARK);
2527 TAINT_NOT; /* Each item is independent */
2528 }
2529 }
2530 }
2531 }
2532 PUTBACK;
1c846c1f 2533
5dd42e15
DM
2534 LEAVE;
2535 cxstack_ix--;
b0d9ce38 2536 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
cd06dffe
GS
2537 PL_curpm = newpm; /* ... and pop $1 et al */
2538
b0d9ce38 2539 LEAVESUB(sv);
f39bc417 2540 return cx->blk_sub.retop;
cd06dffe
GS
2541}
2542
2543
76e3520e 2544STATIC CV *
cea2e8a9 2545S_get_db_sub(pTHX_ SV **svp, CV *cv)
3de9ffa1 2546{
3280af22 2547 SV *dbsv = GvSV(PL_DBsub);
491527d0 2548
f398eb67 2549 save_item(dbsv);
491527d0
GS
2550 if (!PERLDB_SUB_NN) {
2551 GV *gv = CvGV(cv);
2552
491527d0 2553 if ( (CvFLAGS(cv) & (CVf_ANON | CVf_CLONED))
1c846c1f 2554 || strEQ(GvNAME(gv), "END")
491527d0
GS
2555 || ((GvCV(gv) != cv) && /* Could be imported, and old sub redefined. */
2556 !( (SvTYPE(*svp) == SVt_PVGV) && (GvCV((GV*)*svp) == cv)
2557 && (gv = (GV*)*svp) ))) {
2558 /* Use GV from the stack as a fallback. */
2559 /* GV is potentially non-unique, or contain different CV. */
c2e66d9e
GS
2560 SV *tmp = newRV((SV*)cv);
2561 sv_setsv(dbsv, tmp);
2562 SvREFCNT_dec(tmp);
491527d0
GS
2563 }
2564 else {
2565 gv_efullname3(dbsv, gv, Nullch);
2566 }
3de9ffa1
MB
2567 }
2568 else {
a9c4fd4e 2569 const int type = SvTYPE(dbsv);
f398eb67
NC
2570 if (type < SVt_PVIV && type != SVt_IV)
2571 sv_upgrade(dbsv, SVt_PVIV);
155aba94 2572 (void)SvIOK_on(dbsv);
45977657 2573 SvIV_set(dbsv, PTR2IV(cv)); /* Do it the quickest way */
3de9ffa1 2574 }
491527d0 2575
3de9ffa1 2576 if (CvXSUB(cv))
3280af22
NIS
2577 PL_curcopdb = PL_curcop;
2578 cv = GvCV(PL_DBsub);
3de9ffa1
MB
2579 return cv;
2580}
2581
a0d0e21e
LW
2582PP(pp_entersub)
2583{
27da23d5 2584 dVAR; dSP; dPOPss;
a0d0e21e
LW
2585 GV *gv;
2586 HV *stash;
2587 register CV *cv;
c09156bb 2588 register PERL_CONTEXT *cx;
5d94fbed 2589 I32 gimme;
a9c4fd4e 2590 const bool hasargs = (PL_op->op_flags & OPf_STACKED) != 0;
a0d0e21e
LW
2591
2592 if (!sv)
cea2e8a9 2593 DIE(aTHX_ "Not a CODE reference");
a0d0e21e 2594 switch (SvTYPE(sv)) {
f1025168
NC
2595 /* This is overwhelming the most common case: */
2596 case SVt_PVGV:
2597 if (!(cv = GvCVu((GV*)sv)))
2598 cv = sv_2cv(sv, &stash, &gv, FALSE);
2599 if (!cv) {
2600 ENTER;
2601 SAVETMPS;
2602 goto try_autoload;
2603 }
2604 break;
a0d0e21e
LW
2605 default:
2606 if (!SvROK(sv)) {
a9c4fd4e 2607 const char *sym;
3280af22 2608 if (sv == &PL_sv_yes) { /* unfound import, ignore */
fb73857a 2609 if (hasargs)
3280af22 2610 SP = PL_stack_base + POPMARK;
a0d0e21e 2611 RETURN;
fb73857a 2612 }
15ff848f
CS
2613 if (SvGMAGICAL(sv)) {
2614 mg_get(sv);
f5f1d18e
AMS
2615 if (SvROK(sv))
2616 goto got_rv;
aa07b2f6 2617 sym = SvPOKp(sv) ? SvPVX_const(sv) : Nullch;
15ff848f 2618 }
a9c4fd4e
AL
2619 else {
2620 STRLEN n_a;
2d8e6c8d 2621 sym = SvPV(sv, n_a);
a9c4fd4e 2622 }
15ff848f 2623 if (!sym)
cea2e8a9 2624 DIE(aTHX_ PL_no_usym, "a subroutine");
533c011a 2625 if (PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 2626 DIE(aTHX_ PL_no_symref, sym, "a subroutine");
864dbfa3 2627 cv = get_cv(sym, TRUE);
a0d0e21e
LW
2628 break;
2629 }
f5f1d18e 2630 got_rv:
f5284f61
IZ
2631 {
2632 SV **sp = &sv; /* Used in tryAMAGICunDEREF macro. */
2633 tryAMAGICunDEREF(to_cv);
2634 }
a0d0e21e
LW
2635 cv = (CV*)SvRV(sv);
2636 if (SvTYPE(cv) == SVt_PVCV)
2637 break;
2638 /* FALL THROUGH */
2639 case SVt_PVHV:
2640 case SVt_PVAV:
cea2e8a9 2641 DIE(aTHX_ "Not a CODE reference");
f1025168 2642 /* This is the second most common case: */
a0d0e21e
LW
2643 case SVt_PVCV:
2644 cv = (CV*)sv;
2645 break;
a0d0e21e
LW
2646 }
2647
2648 ENTER;
2649 SAVETMPS;
2650
2651 retry:
a0d0e21e 2652 if (!CvROOT(cv) && !CvXSUB(cv)) {
f1025168 2653 goto fooey;
a0d0e21e
LW
2654 }
2655
54310121 2656 gimme = GIMME_V;
67caa1fe 2657 if ((PL_op->op_private & OPpENTERSUB_DB) && GvCV(PL_DBsub) && !CvNODEBUG(cv)) {
06492da6
SF
2658 if (CvASSERTION(cv) && PL_DBassertion)
2659 sv_setiv(PL_DBassertion, 1);
2660
4f01c5a5 2661 cv = get_db_sub(&sv, cv);
ccafdc96
RGS
2662 if (!cv || (!CvXSUB(cv) && !CvSTART(cv)))
2663 DIE(aTHX_ "No DB::sub routine defined");
67caa1fe 2664 }
a0d0e21e 2665
f1025168
NC
2666 if (!(CvXSUB(cv))) {
2667 /* This path taken at least 75% of the time */
a0d0e21e
LW
2668 dMARK;
2669 register I32 items = SP - MARK;
a0d0e21e 2670 AV* padlist = CvPADLIST(cv);
a0d0e21e
LW
2671 PUSHBLOCK(cx, CXt_SUB, MARK);
2672 PUSHSUB(cx);
f39bc417 2673 cx->blk_sub.retop = PL_op->op_next;
a0d0e21e 2674 CvDEPTH(cv)++;
6b35e009
GS
2675 /* XXX This would be a natural place to set C<PL_compcv = cv> so
2676 * that eval'' ops within this sub know the correct lexical space.
a3985cdc
DM
2677 * Owing the speed considerations, we choose instead to search for
2678 * the cv using find_runcv() when calling doeval().
6b35e009 2679 */
b36bdeca 2680 if (CvDEPTH(cv) >= 2) {
1d7c1841 2681 PERL_STACK_OVERFLOW_CHECK();
26019298 2682 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2683 }
dd2155a4 2684 PAD_SET_CUR(padlist, CvDEPTH(cv));
6d4ff0d2 2685 if (hasargs)
6d4ff0d2
MB
2686 {
2687 AV* av;
77a005ab 2688#if 0
bf49b057 2689 DEBUG_S(PerlIO_printf(Perl_debug_log,
0f15f207 2690 "%p entersub preparing @_\n", thr));
77a005ab 2691#endif
dd2155a4 2692 av = (AV*)PAD_SVl(0);
221373f0
GS
2693 if (AvREAL(av)) {
2694 /* @_ is normally not REAL--this should only ever
2695 * happen when DB::sub() calls things that modify @_ */
2696 av_clear(av);
2697 AvREAL_off(av);
2698 AvREIFY_on(av);
2699 }
3280af22
NIS
2700 cx->blk_sub.savearray = GvAV(PL_defgv);
2701 GvAV(PL_defgv) = (AV*)SvREFCNT_inc(av);
dd2155a4 2702 CX_CURPAD_SAVE(cx->blk_sub);
6d4ff0d2 2703 cx->blk_sub.argarray = av;
a0d0e21e
LW
2704 ++MARK;
2705
2706 if (items > AvMAX(av) + 1) {
504618e9 2707 SV **ary = AvALLOC(av);
a0d0e21e
LW
2708 if (AvARRAY(av) != ary) {
2709 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
f880fe2f 2710 SvPV_set(av, (char*)ary);
a0d0e21e
LW
2711 }
2712 if (items > AvMAX(av) + 1) {
2713 AvMAX(av) = items - 1;
2714 Renew(ary,items,SV*);
2715 AvALLOC(av) = ary;
f880fe2f 2716 SvPV_set(av, (char*)ary);
a0d0e21e
LW
2717 }
2718 }
2719 Copy(MARK,AvARRAY(av),items,SV*);
93965878 2720 AvFILLp(av) = items - 1;
1c846c1f 2721
a0d0e21e
LW
2722 while (items--) {
2723 if (*MARK)
2724 SvTEMP_off(*MARK);
2725 MARK++;
2726 }
2727 }
4a925ff6
GS
2728 /* warning must come *after* we fully set up the context
2729 * stuff so that __WARN__ handlers can safely dounwind()
2730 * if they want to
2731 */
2732 if (CvDEPTH(cv) == 100 && ckWARN(WARN_RECURSION)
2733 && !(PERLDB_SUB && cv == GvCV(PL_DBsub)))
2734 sub_crush_depth(cv);
77a005ab 2735#if 0
bf49b057 2736 DEBUG_S(PerlIO_printf(Perl_debug_log,
0f15f207 2737 "%p entersub returning %p\n", thr, CvSTART(cv)));
77a005ab 2738#endif
a0d0e21e
LW
2739 RETURNOP(CvSTART(cv));
2740 }
f1025168
NC
2741 else {
2742#ifdef PERL_XSUB_OLDSTYLE
2743 if (CvOLDSTYLE(cv)) {
2744 I32 (*fp3)(int,int,int);
2745 dMARK;
2746 register I32 items = SP - MARK;
2747 /* We dont worry to copy from @_. */
2748 while (SP > mark) {
2749 SP[1] = SP[0];
2750 SP--;
2751 }
2752 PL_stack_sp = mark + 1;
2753 fp3 = (I32(*)(int,int,int))CvXSUB(cv);
2754 items = (*fp3)(CvXSUBANY(cv).any_i32,
2755 MARK - PL_stack_base + 1,
2756 items);
2757 PL_stack_sp = PL_stack_base + items;
2758 }
2759 else
2760#endif /* PERL_XSUB_OLDSTYLE */
2761 {
2762 I32 markix = TOPMARK;
2763
2764 PUTBACK;
2765
2766 if (!hasargs) {
2767 /* Need to copy @_ to stack. Alternative may be to
2768 * switch stack to @_, and copy return values
2769 * back. This would allow popping @_ in XSUB, e.g.. XXXX */
a3b680e6
AL
2770 AV * const av = GvAV(PL_defgv);
2771 const I32 items = AvFILLp(av) + 1; /* @_ is not tieable */
f1025168
NC
2772
2773 if (items) {
2774 /* Mark is at the end of the stack. */
2775 EXTEND(SP, items);
2776 Copy(AvARRAY(av), SP + 1, items, SV*);
2777 SP += items;
2778 PUTBACK ;
2779 }
2780 }
2781 /* We assume first XSUB in &DB::sub is the called one. */
2782 if (PL_curcopdb) {
2783 SAVEVPTR(PL_curcop);
2784 PL_curcop = PL_curcopdb;
2785 PL_curcopdb = NULL;
2786 }
2787 /* Do we need to open block here? XXXX */
2788 (void)(*CvXSUB(cv))(aTHX_ cv);
2789
2790 /* Enforce some sanity in scalar context. */
2791 if (gimme == G_SCALAR && ++markix != PL_stack_sp - PL_stack_base ) {
2792 if (markix > PL_stack_sp - PL_stack_base)
2793 *(PL_stack_base + markix) = &PL_sv_undef;
2794 else
2795 *(PL_stack_base + markix) = *PL_stack_sp;
2796 PL_stack_sp = PL_stack_base + markix;
2797 }
2798 }
2799 LEAVE;
2800 return NORMAL;
2801 }
2802
2803 assert (0); /* Cannot get here. */
2804 /* This is deliberately moved here as spaghetti code to keep it out of the
2805 hot path. */
2806 {
2807 GV* autogv;
2808 SV* sub_name;
2809
2810 fooey:
2811 /* anonymous or undef'd function leaves us no recourse */
2812 if (CvANON(cv) || !(gv = CvGV(cv)))
2813 DIE(aTHX_ "Undefined subroutine called");
2814
2815 /* autoloaded stub? */
2816 if (cv != GvCV(gv)) {
2817 cv = GvCV(gv);
2818 }
2819 /* should call AUTOLOAD now? */
2820 else {
2821try_autoload:
2822 if ((autogv = gv_autoload4(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv),
2823 FALSE)))
2824 {
2825 cv = GvCV(autogv);
2826 }
2827 /* sorry */
2828 else {
2829 sub_name = sv_newmortal();
2830 gv_efullname3(sub_name, gv, Nullch);
35c1215d 2831 DIE(aTHX_ "Undefined subroutine &%"SVf" called", sub_name);
f1025168
NC
2832 }
2833 }
2834 if (!cv)
2835 DIE(aTHX_ "Not a CODE reference");
2836 goto retry;
2837 }
a0d0e21e
LW
2838}
2839
44a8e56a 2840void
864dbfa3 2841Perl_sub_crush_depth(pTHX_ CV *cv)
44a8e56a
PP
2842{
2843 if (CvANON(cv))
9014280d 2844 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on anonymous subroutine");
44a8e56a
PP
2845 else {
2846 SV* tmpstr = sv_newmortal();
2847 gv_efullname3(tmpstr, CvGV(cv), Nullch);
35c1215d
NC
2848 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on subroutine \"%"SVf"\"",
2849 tmpstr);
44a8e56a
PP
2850 }
2851}
2852
a0d0e21e
LW
2853PP(pp_aelem)
2854{
39644a26 2855 dSP;
a0d0e21e 2856 SV** svp;
a3b680e6 2857 SV* const elemsv = POPs;
d804643f 2858 IV elem = SvIV(elemsv);
68dc0745 2859 AV* av = (AV*)POPs;
e1ec3a88
AL
2860 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
2861 const U32 defer = (PL_op->op_private & OPpLVAL_DEFER) && (elem > av_len(av));
be6c24e0 2862 SV *sv;
a0d0e21e 2863
e35c1634 2864 if (SvROK(elemsv) && !SvGAMAGIC(elemsv) && ckWARN(WARN_MISC))
35c1215d 2865 Perl_warner(aTHX_ packWARN(WARN_MISC), "Use of reference \"%"SVf"\" as array index", elemsv);
748a9306 2866 if (elem > 0)
3280af22 2867 elem -= PL_curcop->cop_arybase;
a0d0e21e
LW
2868 if (SvTYPE(av) != SVt_PVAV)
2869 RETPUSHUNDEF;
68dc0745 2870 svp = av_fetch(av, elem, lval && !defer);
a0d0e21e 2871 if (lval) {
2b573ace 2872#ifdef PERL_MALLOC_WRAP
2b573ace 2873 if (SvUOK(elemsv)) {
a9c4fd4e 2874 const UV uv = SvUV(elemsv);
2b573ace
JH
2875 elem = uv > IV_MAX ? IV_MAX : uv;
2876 }
2877 else if (SvNOK(elemsv))
2878 elem = (IV)SvNV(elemsv);
a3b680e6
AL
2879 if (elem > 0) {
2880 static const char oom_array_extend[] =
2881 "Out of memory during array extend"; /* Duplicated in av.c */
2b573ace 2882 MEM_WRAP_CHECK_1(elem,SV*,oom_array_extend);
a3b680e6 2883 }
2b573ace 2884#endif
3280af22 2885 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
2886 SV* lv;
2887 if (!defer)
cea2e8a9 2888 DIE(aTHX_ PL_no_aelem, elem);
68dc0745
PP
2889 lv = sv_newmortal();
2890 sv_upgrade(lv, SVt_PVLV);
2891 LvTYPE(lv) = 'y';
14befaf4 2892 sv_magic(lv, Nullsv, PERL_MAGIC_defelem, Nullch, 0);
68dc0745
PP
2893 LvTARG(lv) = SvREFCNT_inc(av);
2894 LvTARGOFF(lv) = elem;
2895 LvTARGLEN(lv) = 1;
2896 PUSHs(lv);
2897 RETURN;
2898 }
bfc4de9f 2899 if (PL_op->op_private & OPpLVAL_INTRO)
161b7d16 2900 save_aelem(av, elem, svp);
533c011a
NIS
2901 else if (PL_op->op_private & OPpDEREF)
2902 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 2903 }
3280af22 2904 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
2905 if (!lval && SvGMAGICAL(sv)) /* see note in pp_helem() */
2906 sv = sv_mortalcopy(sv);
2907 PUSHs(sv);
a0d0e21e
LW
2908 RETURN;
2909}
2910
02a9e968 2911void
864dbfa3 2912Perl_vivify_ref(pTHX_ SV *sv, U32 to_what)
02a9e968
CS
2913{
2914 if (SvGMAGICAL(sv))
2915 mg_get(sv);
2916 if (!SvOK(sv)) {
2917 if (SvREADONLY(sv))
cea2e8a9 2918 Perl_croak(aTHX_ PL_no_modify);
5f05dabc
PP
2919 if (SvTYPE(sv) < SVt_RV)
2920 sv_upgrade(sv, SVt_RV);
2921 else if (SvTYPE(sv) >= SVt_PV) {
8bd4d4c5 2922 SvPV_free(sv);
b162af07
SP
2923 SvLEN_set(sv, 0);
2924 SvCUR_set(sv, 0);
5f05dabc 2925 }
68dc0745 2926 switch (to_what) {
5f05dabc 2927 case OPpDEREF_SV:
b162af07 2928 SvRV_set(sv, NEWSV(355,0));
5f05dabc
PP
2929 break;
2930 case OPpDEREF_AV:
b162af07 2931 SvRV_set(sv, (SV*)newAV());
5f05dabc
PP
2932 break;
2933 case OPpDEREF_HV:
b162af07 2934 SvRV_set(sv, (SV*)newHV());
5f05dabc
PP
2935 break;
2936 }
02a9e968
CS
2937 SvROK_on(sv);
2938 SvSETMAGIC(sv);
2939 }
2940}
2941
a0d0e21e
LW
2942PP(pp_method)
2943{
39644a26 2944 dSP;
f5d5a27c
CS
2945 SV* sv = TOPs;
2946
2947 if (SvROK(sv)) {
eda383f2 2948 SV* rsv = SvRV(sv);
f5d5a27c
CS
2949 if (SvTYPE(rsv) == SVt_PVCV) {
2950 SETs(rsv);
2951 RETURN;
2952 }
2953 }
2954
2955 SETs(method_common(sv, Null(U32*)));
2956 RETURN;
2957}
2958
2959PP(pp_method_named)
2960{
39644a26 2961 dSP;
3848b962 2962 SV* sv = cSVOP_sv;
f5d5a27c
CS
2963 U32 hash = SvUVX(sv);
2964
2965 XPUSHs(method_common(sv, &hash));
2966 RETURN;
2967}
2968
2969STATIC SV *
2970S_method_common(pTHX_ SV* meth, U32* hashp)
2971{
a0d0e21e
LW
2972 SV* sv;
2973 SV* ob;
2974 GV* gv;
56304f61 2975 HV* stash;
f5d5a27c 2976 STRLEN namelen;
a9c4fd4e 2977 const char* packname = 0;
0dae17bd 2978 SV *packsv = Nullsv;
ac91690f 2979 STRLEN packlen;
a9c4fd4e 2980 const char *name = SvPV(meth, namelen);
a0d0e21e 2981
3280af22 2982 sv = *(PL_stack_base + TOPMARK + 1);
f5d5a27c 2983
4f1b7578
SC
2984 if (!sv)
2985 Perl_croak(aTHX_ "Can't call method \"%s\" on an undefined value", name);
2986
16d20bd9 2987 if (SvGMAGICAL(sv))
af09ea45 2988 mg_get(sv);
a0d0e21e 2989 if (SvROK(sv))
16d20bd9 2990 ob = (SV*)SvRV(sv);
a0d0e21e
LW
2991 else {
2992 GV* iogv;
a0d0e21e 2993
af09ea45 2994 /* this isn't a reference */
56304f61 2995 packname = Nullch;
081fc587
AB
2996
2997 if(SvOK(sv) && (packname = SvPV(sv, packlen))) {
b464bac0 2998 const HE* const he = hv_fetch_ent(PL_stashcache, sv, 0, 0);
081fc587 2999 if (he) {
5e6396ae 3000 stash = INT2PTR(HV*,SvIV(HeVAL(he)));
081fc587
AB
3001 goto fetch;
3002 }
3003 }
3004
a0d0e21e 3005 if (!SvOK(sv) ||
05f5af9a 3006 !(packname) ||
7a5fd60d 3007 !(iogv = gv_fetchsv(sv, FALSE, SVt_PVIO)) ||
a0d0e21e
LW
3008 !(ob=(SV*)GvIO(iogv)))
3009 {
af09ea45 3010 /* this isn't the name of a filehandle either */
1c846c1f 3011 if (!packname ||
fd400ab9 3012 ((UTF8_IS_START(*packname) && DO_UTF8(sv))
b86a2fa7 3013 ? !isIDFIRST_utf8((U8*)packname)
834a4ddd
LW
3014 : !isIDFIRST(*packname)
3015 ))
3016 {
f5d5a27c
CS
3017 Perl_croak(aTHX_ "Can't call method \"%s\" %s", name,
3018 SvOK(sv) ? "without a package or object reference"
3019 : "on an undefined value");
834a4ddd 3020 }
af09ea45
IK
3021 /* assume it's a package name */
3022 stash = gv_stashpvn(packname, packlen, FALSE);
0dae17bd
GS
3023 if (!stash)
3024 packsv = sv;
081fc587 3025 else {
5e6396ae 3026 SV* ref = newSViv(PTR2IV(stash));
7e8961ec
AB
3027 hv_store(PL_stashcache, packname, packlen, ref, 0);
3028 }
ac91690f 3029 goto fetch;
a0d0e21e 3030 }
af09ea45 3031 /* it _is_ a filehandle name -- replace with a reference */
3280af22 3032 *(PL_stack_base + TOPMARK + 1) = sv_2mortal(newRV((SV*)iogv));
a0d0e21e
LW
3033 }
3034
af09ea45 3035 /* if we got here, ob should be a reference or a glob */
f0d43078
GS
3036 if (!ob || !(SvOBJECT(ob)
3037 || (SvTYPE(ob) == SVt_PVGV && (ob = (SV*)GvIO((GV*)ob))
3038 && SvOBJECT(ob))))
3039 {
f5d5a27c
CS
3040 Perl_croak(aTHX_ "Can't call method \"%s\" on unblessed reference",
3041 name);
f0d43078 3042 }
a0d0e21e 3043
56304f61 3044 stash = SvSTASH(ob);
a0d0e21e 3045
ac91690f 3046 fetch:
af09ea45
IK
3047 /* NOTE: stash may be null, hope hv_fetch_ent and
3048 gv_fetchmethod can cope (it seems they can) */
3049
f5d5a27c
CS
3050 /* shortcut for simple names */
3051 if (hashp) {
b464bac0 3052 const HE* const he = hv_fetch_ent(stash, meth, 0, *hashp);
f5d5a27c
CS
3053 if (he) {
3054 gv = (GV*)HeVAL(he);
3055 if (isGV(gv) && GvCV(gv) &&
3056 (!GvCVGEN(gv) || GvCVGEN(gv) == PL_sub_generation))
3057 return (SV*)GvCV(gv);
3058 }
3059 }
3060
0dae17bd 3061 gv = gv_fetchmethod(stash ? stash : (HV*)packsv, name);
af09ea45 3062
56304f61 3063 if (!gv) {
af09ea45
IK
3064 /* This code tries to figure out just what went wrong with
3065 gv_fetchmethod. It therefore needs to duplicate a lot of
3066 the internals of that function. We can't move it inside
3067 Perl_gv_fetchmethod_autoload(), however, since that would
3068 cause UNIVERSAL->can("NoSuchPackage::foo") to croak, and we
3069 don't want that.
3070 */
a9c4fd4e
AL
3071 const char* leaf = name;
3072 const char* sep = Nullch;
3073 const char* p;
56304f61
CS
3074
3075 for (p = name; *p; p++) {
3076 if (*p == '\'')
3077 sep = p, leaf = p + 1;
3078 else if (*p == ':' && *(p + 1) == ':')
3079 sep = p, leaf = p + 2;
3080 }
3081 if (!sep || ((sep - name) == 5 && strnEQ(name, "SUPER", 5))) {
9b9d0b15
NC
3082 /* the method name is unqualified or starts with SUPER:: */
3083 bool need_strlen = 1;
3084 if (sep) {
3085 packname = CopSTASHPV(PL_curcop);
3086 }
3087 else if (stash) {
3088 HEK *packhek = HvNAME_HEK(stash);
3089 if (packhek) {
3090 packname = HEK_KEY(packhek);
3091 packlen = HEK_LEN(packhek);
3092 need_strlen = 0;
3093 } else {
3094 goto croak;
3095 }
3096 }
3097
3098 if (!packname) {
3099 croak:
e27ad1f2
AV
3100 Perl_croak(aTHX_
3101 "Can't use anonymous symbol table for method lookup");
9b9d0b15
NC
3102 }
3103 else if (need_strlen)
e27ad1f2 3104 packlen = strlen(packname);
9b9d0b15 3105
56304f61
CS
3106 }
3107 else {
af09ea45 3108 /* the method name is qualified */
56304f61
CS
3109 packname = name;
3110 packlen = sep - name;
3111 }
af09ea45
IK
3112
3113 /* we're relying on gv_fetchmethod not autovivifying the stash */
3114 if (gv_stashpvn(packname, packlen, FALSE)) {
c1899e02 3115 Perl_croak(aTHX_
af09ea45
IK
3116 "Can't locate object method \"%s\" via package \"%.*s\"",
3117 leaf, (int)packlen, packname);
c1899e02
GS
3118 }
3119 else {
3120 Perl_croak(aTHX_
af09ea45
IK
3121 "Can't locate object method \"%s\" via package \"%.*s\""
3122 " (perhaps you forgot to load \"%.*s\"?)",
3123 leaf, (int)packlen, packname, (int)packlen, packname);
c1899e02 3124 }
56304f61 3125 }
f5d5a27c 3126 return isGV(gv) ? (SV*)GvCV(gv) : (SV*)gv;
a0d0e21e 3127}
241d1a3b
NC
3128
3129/*
3130 * Local variables:
3131 * c-indentation-style: bsd
3132 * c-basic-offset: 4
3133 * indent-tabs-mode: t
3134 * End:
3135 *
37442d52
RGS
3136 * ex: set ts=8 sts=4 sw=4 noet:
3137 */