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[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;
6d822dc4
MS
914 HE *didstore;
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;
1297 I32 len;
a0d0e21e 1298
c277df42 1299 SPAGAIN; /* EVAL blocks could move the stack. */
ffc61ed2
JH
1300 EXTEND(SP, nparens + i);
1301 EXTEND_MORTAL(nparens + i);
1302 for (i = !i; i <= nparens; i++) {
a0d0e21e
LW
1303 PUSHs(sv_newmortal());
1304 /*SUPPRESS 560*/
cf93c79d
IZ
1305 if ((rx->startp[i] != -1) && rx->endp[i] != -1 ) {
1306 len = rx->endp[i] - rx->startp[i];
289555fe 1307 s = rx->startp[i] + truebase;
290deeac
A
1308 if (rx->endp[i] < 0 || rx->startp[i] < 0 ||
1309 len < 0 || len > strend - s)
1310 DIE(aTHX_ "panic: pp_match start/end pointers");
a0d0e21e 1311 sv_setpvn(*SP, s, len);
cce850e4 1312 if (DO_UTF8(TARG) && is_utf8_string((U8*)s, len))
a197cbdd 1313 SvUTF8_on(*SP);
a0d0e21e
LW
1314 }
1315 }
1316 if (global) {
d65afb4b 1317 if (dynpm->op_pmflags & PMf_CONTINUE) {
0af80b60
HS
1318 MAGIC* mg = 0;
1319 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
1320 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1321 if (!mg) {
1322 sv_magic(TARG, (SV*)0, PERL_MAGIC_regex_global, Nullch, 0);
1323 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1324 }
1325 if (rx->startp[0] != -1) {
1326 mg->mg_len = rx->endp[0];
1327 if (rx->startp[0] == rx->endp[0])
1328 mg->mg_flags |= MGf_MINMATCH;
1329 else
1330 mg->mg_flags &= ~MGf_MINMATCH;
1331 }
1332 }
cf93c79d
IZ
1333 had_zerolen = (rx->startp[0] != -1
1334 && rx->startp[0] == rx->endp[0]);
c277df42 1335 PUTBACK; /* EVAL blocks may use stack */
cf93c79d 1336 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
1337 goto play_it_again;
1338 }
ffc61ed2 1339 else if (!nparens)
bde848c5 1340 XPUSHs(&PL_sv_yes);
4633a7c4 1341 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1342 RETURN;
1343 }
1344 else {
1345 if (global) {
1346 MAGIC* mg = 0;
1347 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
14befaf4 1348 mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1349 if (!mg) {
14befaf4
DM
1350 sv_magic(TARG, (SV*)0, PERL_MAGIC_regex_global, Nullch, 0);
1351 mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1352 }
cf93c79d
IZ
1353 if (rx->startp[0] != -1) {
1354 mg->mg_len = rx->endp[0];
d9f97599 1355 if (rx->startp[0] == rx->endp[0])
748a9306
LW
1356 mg->mg_flags |= MGf_MINMATCH;
1357 else
1358 mg->mg_flags &= ~MGf_MINMATCH;
1359 }
a0d0e21e 1360 }
4633a7c4 1361 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1362 RETPUSHYES;
1363 }
1364
f722798b 1365yup: /* Confirmed by INTUIT */
72311751
GS
1366 if (rxtainted)
1367 RX_MATCH_TAINTED_on(rx);
1368 TAINT_IF(RX_MATCH_TAINTED(rx));
3280af22 1369 PL_curpm = pm;
d65afb4b
HS
1370 if (dynpm->op_pmflags & PMf_ONCE)
1371 dynpm->op_pmdynflags |= PMdf_USED;
cf93c79d
IZ
1372 if (RX_MATCH_COPIED(rx))
1373 Safefree(rx->subbeg);
1374 RX_MATCH_COPIED_off(rx);
1375 rx->subbeg = Nullch;
a0d0e21e 1376 if (global) {
d9f97599 1377 rx->subbeg = truebase;
cf93c79d 1378 rx->startp[0] = s - truebase;
a30b2f1f 1379 if (RX_MATCH_UTF8(rx)) {
60aeb6fd
NIS
1380 char *t = (char*)utf8_hop((U8*)s, rx->minlen);
1381 rx->endp[0] = t - truebase;
1382 }
1383 else {
1384 rx->endp[0] = s - truebase + rx->minlen;
1385 }
cf93c79d 1386 rx->sublen = strend - truebase;
a0d0e21e 1387 goto gotcha;
1c846c1f 1388 }
14977893
JH
1389 if (PL_sawampersand) {
1390 I32 off;
ed252734
NC
1391#ifdef PERL_COPY_ON_WRITE
1392 if (SvIsCOW(TARG) || (SvFLAGS(TARG) & CAN_COW_MASK) == CAN_COW_FLAGS) {
1393 if (DEBUG_C_TEST) {
1394 PerlIO_printf(Perl_debug_log,
1395 "Copy on write: pp_match $& capture, type %d, truebase=%p, t=%p, difference %d\n",
1396 (int) SvTYPE(TARG), truebase, t,
1397 (int)(t-truebase));
1398 }
1399 rx->saved_copy = sv_setsv_cow(rx->saved_copy, TARG);
1400 rx->subbeg = SvPVX(rx->saved_copy) + (t - truebase);
1401 assert (SvPOKp(rx->saved_copy));
1402 } else
1403#endif
1404 {
14977893 1405
ed252734
NC
1406 rx->subbeg = savepvn(t, strend - t);
1407#ifdef PERL_COPY_ON_WRITE
1408 rx->saved_copy = Nullsv;
1409#endif
1410 }
14977893
JH
1411 rx->sublen = strend - t;
1412 RX_MATCH_COPIED_on(rx);
1413 off = rx->startp[0] = s - t;
1414 rx->endp[0] = off + rx->minlen;
1415 }
1416 else { /* startp/endp are used by @- @+. */
1417 rx->startp[0] = s - truebase;
1418 rx->endp[0] = s - truebase + rx->minlen;
1419 }
2d862feb 1420 rx->nparens = rx->lastparen = rx->lastcloseparen = 0; /* used by @-, @+, and $^N */
4633a7c4 1421 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1422 RETPUSHYES;
1423
1424nope:
a0d0e21e 1425ret_no:
d65afb4b 1426 if (global && !(dynpm->op_pmflags & PMf_CONTINUE)) {
a0d0e21e 1427 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
14befaf4 1428 MAGIC* mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1429 if (mg)
565764a8 1430 mg->mg_len = -1;
a0d0e21e
LW
1431 }
1432 }
4633a7c4 1433 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1434 if (gimme == G_ARRAY)
1435 RETURN;
1436 RETPUSHNO;
1437}
1438
1439OP *
864dbfa3 1440Perl_do_readline(pTHX)
a0d0e21e 1441{
27da23d5 1442 dVAR; dSP; dTARGETSTACKED;
a0d0e21e
LW
1443 register SV *sv;
1444 STRLEN tmplen = 0;
1445 STRLEN offset;
760ac839 1446 PerlIO *fp;
a3b680e6
AL
1447 register IO * const io = GvIO(PL_last_in_gv);
1448 register const I32 type = PL_op->op_type;
1449 const I32 gimme = GIMME_V;
e79b0511 1450 MAGIC *mg;
a0d0e21e 1451
5b468f54 1452 if (io && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar))) {
e79b0511 1453 PUSHMARK(SP);
5b468f54 1454 XPUSHs(SvTIED_obj((SV*)io, mg));
e79b0511
PP
1455 PUTBACK;
1456 ENTER;
864dbfa3 1457 call_method("READLINE", gimme);
e79b0511
PP
1458 LEAVE;
1459 SPAGAIN;
0b7c7b4f
HS
1460 if (gimme == G_SCALAR) {
1461 SV* result = POPs;
1462 SvSetSV_nosteal(TARG, result);
1463 PUSHTARG;
1464 }
e79b0511
PP
1465 RETURN;
1466 }
a0d0e21e
LW
1467 fp = Nullfp;
1468 if (io) {
1469 fp = IoIFP(io);
1470 if (!fp) {
1471 if (IoFLAGS(io) & IOf_ARGV) {
1472 if (IoFLAGS(io) & IOf_START) {
a0d0e21e 1473 IoLINES(io) = 0;
3280af22 1474 if (av_len(GvAVn(PL_last_in_gv)) < 0) {
1d7c1841 1475 IoFLAGS(io) &= ~IOf_START;
9d116dd7 1476 do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,Nullfp);
3280af22
NIS
1477 sv_setpvn(GvSV(PL_last_in_gv), "-", 1);
1478 SvSETMAGIC(GvSV(PL_last_in_gv));
a2008d6d
GS
1479 fp = IoIFP(io);
1480 goto have_fp;
a0d0e21e
LW
1481 }
1482 }
3280af22 1483 fp = nextargv(PL_last_in_gv);
a0d0e21e 1484 if (!fp) { /* Note: fp != IoIFP(io) */
3280af22 1485 (void)do_close(PL_last_in_gv, FALSE); /* now it does*/
a0d0e21e
LW
1486 }
1487 }
0d44d22b
NC
1488 else if (type == OP_GLOB)
1489 fp = Perl_start_glob(aTHX_ POPs, io);
a0d0e21e
LW
1490 }
1491 else if (type == OP_GLOB)
1492 SP--;
a00b5bd3 1493 else if (ckWARN(WARN_IO) && IoTYPE(io) == IoTYPE_WRONLY) {
4c80c0b2 1494 report_evil_fh(PL_last_in_gv, io, OP_phoney_OUTPUT_ONLY);
a00b5bd3 1495 }
a0d0e21e
LW
1496 }
1497 if (!fp) {
790090df
HS
1498 if (ckWARN2(WARN_GLOB, WARN_CLOSED)
1499 && (!io || !(IoFLAGS(io) & IOf_START))) {
3f4520fe 1500 if (type == OP_GLOB)
9014280d 1501 Perl_warner(aTHX_ packWARN(WARN_GLOB),
af8c498a
GS
1502 "glob failed (can't start child: %s)",
1503 Strerror(errno));
69282e91 1504 else
bc37a18f 1505 report_evil_fh(PL_last_in_gv, io, PL_op->op_type);
3f4520fe 1506 }
54310121 1507 if (gimme == G_SCALAR) {
79628082 1508 /* undef TARG, and push that undefined value */
ba92458f
AE
1509 if (type != OP_RCATLINE) {
1510 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1511 SvOK_off(TARG);
ba92458f 1512 }
a0d0e21e
LW
1513 PUSHTARG;
1514 }
1515 RETURN;
1516 }
a2008d6d 1517 have_fp:
54310121 1518 if (gimme == G_SCALAR) {
a0d0e21e 1519 sv = TARG;
9607fc9c
PP
1520 if (SvROK(sv))
1521 sv_unref(sv);
a0d0e21e
LW
1522 (void)SvUPGRADE(sv, SVt_PV);
1523 tmplen = SvLEN(sv); /* remember if already alloced */
bc44a8a2 1524 if (!tmplen && !SvREADONLY(sv))
a0d0e21e 1525 Sv_Grow(sv, 80); /* try short-buffering it */
2b5e58c4
AMS
1526 offset = 0;
1527 if (type == OP_RCATLINE && SvOK(sv)) {
1528 if (!SvPOK(sv)) {
1529 STRLEN n_a;
1530 (void)SvPV_force(sv, n_a);
1531 }
a0d0e21e 1532 offset = SvCUR(sv);
2b5e58c4 1533 }
a0d0e21e 1534 }
54310121
PP
1535 else {
1536 sv = sv_2mortal(NEWSV(57, 80));
1537 offset = 0;
1538 }
fbad3eb5 1539
3887d568
AP
1540 /* This should not be marked tainted if the fp is marked clean */
1541#define MAYBE_TAINT_LINE(io, sv) \
1542 if (!(IoFLAGS(io) & IOf_UNTAINT)) { \
1543 TAINT; \
1544 SvTAINTED_on(sv); \
1545 }
1546
684bef36 1547/* delay EOF state for a snarfed empty file */
fbad3eb5 1548#define SNARF_EOF(gimme,rs,io,sv) \
684bef36 1549 (gimme != G_SCALAR || SvCUR(sv) \
b9fee9ba 1550 || (IoFLAGS(io) & IOf_NOLINE) || !RsSNARF(rs))
fbad3eb5 1551
a0d0e21e 1552 for (;;) {
09e8efcc 1553 PUTBACK;
fbad3eb5 1554 if (!sv_gets(sv, fp, offset)
2d726892
TF
1555 && (type == OP_GLOB
1556 || SNARF_EOF(gimme, PL_rs, io, sv)
1557 || PerlIO_error(fp)))
fbad3eb5 1558 {
760ac839 1559 PerlIO_clearerr(fp);
a0d0e21e 1560 if (IoFLAGS(io) & IOf_ARGV) {
3280af22 1561 fp = nextargv(PL_last_in_gv);
a0d0e21e
LW
1562 if (fp)
1563 continue;
3280af22 1564 (void)do_close(PL_last_in_gv, FALSE);
a0d0e21e
LW
1565 }
1566 else if (type == OP_GLOB) {
e476b1b5 1567 if (!do_close(PL_last_in_gv, FALSE) && ckWARN(WARN_GLOB)) {
9014280d 1568 Perl_warner(aTHX_ packWARN(WARN_GLOB),
4eb79ab5 1569 "glob failed (child exited with status %d%s)",
894356b3 1570 (int)(STATUS_CURRENT >> 8),
cf494569 1571 (STATUS_CURRENT & 0x80) ? ", core dumped" : "");
4eb79ab5 1572 }
a0d0e21e 1573 }
54310121 1574 if (gimme == G_SCALAR) {
ba92458f
AE
1575 if (type != OP_RCATLINE) {
1576 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1577 SvOK_off(TARG);
ba92458f 1578 }
09e8efcc 1579 SPAGAIN;
a0d0e21e
LW
1580 PUSHTARG;
1581 }
3887d568 1582 MAYBE_TAINT_LINE(io, sv);
a0d0e21e
LW
1583 RETURN;
1584 }
3887d568 1585 MAYBE_TAINT_LINE(io, sv);
a0d0e21e 1586 IoLINES(io)++;
b9fee9ba 1587 IoFLAGS(io) |= IOf_NOLINE;
71be2cbc 1588 SvSETMAGIC(sv);
09e8efcc 1589 SPAGAIN;
a0d0e21e 1590 XPUSHs(sv);
a0d0e21e
LW
1591 if (type == OP_GLOB) {
1592 char *tmps;
1593
3280af22 1594 if (SvCUR(sv) > 0 && SvCUR(PL_rs) > 0) {
c07a80fd 1595 tmps = SvEND(sv) - 1;
3280af22 1596 if (*tmps == *SvPVX(PL_rs)) {
c07a80fd 1597 *tmps = '\0';
b162af07 1598 SvCUR_set(sv, SvCUR(sv) - 1);
c07a80fd
PP
1599 }
1600 }
a0d0e21e
LW
1601 for (tmps = SvPVX(sv); *tmps; tmps++)
1602 if (!isALPHA(*tmps) && !isDIGIT(*tmps) &&
1603 strchr("$&*(){}[]'\";\\|?<>~`", *tmps))
1604 break;
43384a1a 1605 if (*tmps && PerlLIO_lstat(SvPVX(sv), &PL_statbuf) < 0) {
a0d0e21e
LW
1606 (void)POPs; /* Unmatched wildcard? Chuck it... */
1607 continue;
1608 }
2d79bf7f 1609 } else if (SvUTF8(sv)) { /* OP_READLINE, OP_RCATLINE */
7fc63493
AL
1610 const U8 *s = (U8*)SvPVX(sv) + offset;
1611 const STRLEN len = SvCUR(sv) - offset;
1612 const U8 *f;
2d79bf7f
JH
1613
1614 if (ckWARN(WARN_UTF8) &&
1615 !Perl_is_utf8_string_loc(aTHX_ s, len, &f))
1616 /* Emulate :encoding(utf8) warning in the same case. */
1617 Perl_warner(aTHX_ packWARN(WARN_UTF8),
1618 "utf8 \"\\x%02X\" does not map to Unicode",
1619 f < (U8*)SvEND(sv) ? *f : 0);
a0d0e21e 1620 }
54310121 1621 if (gimme == G_ARRAY) {
a0d0e21e 1622 if (SvLEN(sv) - SvCUR(sv) > 20) {
1da4ca5f 1623 SvPV_shrink_to_cur(sv);
a0d0e21e
LW
1624 }
1625 sv = sv_2mortal(NEWSV(58, 80));
1626 continue;
1627 }
54310121 1628 else if (gimme == G_SCALAR && !tmplen && SvLEN(sv) - SvCUR(sv) > 80) {
a0d0e21e 1629 /* try to reclaim a bit of scalar space (only on 1st alloc) */
d5b5861b
NC
1630 const STRLEN new_len
1631 = SvCUR(sv) < 60 ? 80 : SvCUR(sv)+40; /* allow some slop */
1da4ca5f 1632 SvPV_renew(sv, new_len);
a0d0e21e
LW
1633 }
1634 RETURN;
1635 }
1636}
1637
1638PP(pp_enter)
1639{
27da23d5 1640 dVAR; dSP;
c09156bb 1641 register PERL_CONTEXT *cx;
533c011a 1642 I32 gimme = OP_GIMME(PL_op, -1);
a0d0e21e 1643
54310121
PP
1644 if (gimme == -1) {
1645 if (cxstack_ix >= 0)
1646 gimme = cxstack[cxstack_ix].blk_gimme;
1647 else
1648 gimme = G_SCALAR;
1649 }
a0d0e21e
LW
1650
1651 ENTER;
1652
1653 SAVETMPS;
924508f0 1654 PUSHBLOCK(cx, CXt_BLOCK, SP);
a0d0e21e
LW
1655
1656 RETURN;
1657}
1658
1659PP(pp_helem)
1660{
39644a26 1661 dSP;
760ac839 1662 HE* he;
ae77835f 1663 SV **svp;
a0d0e21e 1664 SV *keysv = POPs;
a0d0e21e 1665 HV *hv = (HV*)POPs;
a3b680e6
AL
1666 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
1667 const U32 defer = PL_op->op_private & OPpLVAL_DEFER;
be6c24e0 1668 SV *sv;
765f542d 1669#ifdef PERL_COPY_ON_WRITE
a3b680e6 1670 const U32 hash = (SvIsCOW_shared_hash(keysv)) ? SvUVX(keysv) : 0;
765f542d 1671#else
a3b680e6 1672 const U32 hash = (SvFAKE(keysv) && SvREADONLY(keysv)) ? SvUVX(keysv) : 0;
765f542d 1673#endif
9c5ffd7c 1674 I32 preeminent = 0;
a0d0e21e 1675
ae77835f 1676 if (SvTYPE(hv) == SVt_PVHV) {
8d1f198f
DM
1677 if (PL_op->op_private & OPpLVAL_INTRO) {
1678 MAGIC *mg;
1679 HV *stash;
1680 /* does the element we're localizing already exist? */
c39e6ab0 1681 preeminent =
8d1f198f
DM
1682 /* can we determine whether it exists? */
1683 ( !SvRMAGICAL(hv)
1684 || mg_find((SV*)hv, PERL_MAGIC_env)
1685 || ( (mg = mg_find((SV*)hv, PERL_MAGIC_tied))
1686 /* Try to preserve the existenceness of a tied hash
1687 * element by using EXISTS and DELETE if possible.
1688 * Fallback to FETCH and STORE otherwise */
1689 && (stash = SvSTASH(SvRV(SvTIED_obj((SV*)hv, mg))))
1690 && gv_fetchmethod_autoload(stash, "EXISTS", TRUE)
1691 && gv_fetchmethod_autoload(stash, "DELETE", TRUE)
1692 )
1693 ) ? hv_exists_ent(hv, keysv, 0) : 1;
c39e6ab0 1694
8d1f198f 1695 }
1c846c1f 1696 he = hv_fetch_ent(hv, keysv, lval && !defer, hash);
97fcbf96 1697 svp = he ? &HeVAL(he) : 0;
ae77835f 1698 }
c750a3ec 1699 else {
a0d0e21e 1700 RETPUSHUNDEF;
c750a3ec 1701 }
a0d0e21e 1702 if (lval) {
3280af22 1703 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
1704 SV* lv;
1705 SV* key2;
2d8e6c8d 1706 if (!defer) {
ce5030a2 1707 DIE(aTHX_ PL_no_helem_sv, keysv);
2d8e6c8d 1708 }
68dc0745
PP
1709 lv = sv_newmortal();
1710 sv_upgrade(lv, SVt_PVLV);
1711 LvTYPE(lv) = 'y';
14befaf4 1712 sv_magic(lv, key2 = newSVsv(keysv), PERL_MAGIC_defelem, Nullch, 0);
68dc0745
PP
1713 SvREFCNT_dec(key2); /* sv_magic() increments refcount */
1714 LvTARG(lv) = SvREFCNT_inc(hv);
1715 LvTARGLEN(lv) = 1;
1716 PUSHs(lv);
1717 RETURN;
1718 }
533c011a 1719 if (PL_op->op_private & OPpLVAL_INTRO) {
bfcb3514 1720 if (HvNAME_get(hv) && isGV(*svp))
533c011a 1721 save_gp((GV*)*svp, !(PL_op->op_flags & OPf_SPECIAL));
1f5346dc
SC
1722 else {
1723 if (!preeminent) {
1724 STRLEN keylen;
a3b680e6 1725 const char * const key = SvPV(keysv, keylen);
57813020 1726 SAVEDELETE(hv, savepvn(key,keylen), keylen);
bfc4de9f 1727 } else
1f5346dc
SC
1728 save_helem(hv, keysv, svp);
1729 }
5f05dabc 1730 }
533c011a
NIS
1731 else if (PL_op->op_private & OPpDEREF)
1732 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 1733 }
3280af22 1734 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
1735 /* This makes C<local $tied{foo} = $tied{foo}> possible.
1736 * Pushing the magical RHS on to the stack is useless, since
1737 * that magic is soon destined to be misled by the local(),
1738 * and thus the later pp_sassign() will fail to mg_get() the
1739 * old value. This should also cure problems with delayed
1740 * mg_get()s. GSAR 98-07-03 */
1741 if (!lval && SvGMAGICAL(sv))
1742 sv = sv_mortalcopy(sv);
1743 PUSHs(sv);
a0d0e21e
LW
1744 RETURN;
1745}
1746
1747PP(pp_leave)
1748{
27da23d5 1749 dVAR; dSP;
c09156bb 1750 register PERL_CONTEXT *cx;
a0d0e21e
LW
1751 SV **newsp;
1752 PMOP *newpm;
1753 I32 gimme;
1754
533c011a 1755 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e 1756 cx = &cxstack[cxstack_ix];
3280af22 1757 cx->blk_oldpm = PL_curpm; /* fake block should preserve $1 et al */
a0d0e21e
LW
1758 }
1759
1760 POPBLOCK(cx,newpm);
1761
533c011a 1762 gimme = OP_GIMME(PL_op, -1);
54310121
PP
1763 if (gimme == -1) {
1764 if (cxstack_ix >= 0)
1765 gimme = cxstack[cxstack_ix].blk_gimme;
1766 else
1767 gimme = G_SCALAR;
1768 }
a0d0e21e 1769
a1f49e72 1770 TAINT_NOT;
54310121
PP
1771 if (gimme == G_VOID)
1772 SP = newsp;
1773 else if (gimme == G_SCALAR) {
a3b680e6 1774 register SV **mark;
54310121 1775 MARK = newsp + 1;
09256e2f 1776 if (MARK <= SP) {
54310121
PP
1777 if (SvFLAGS(TOPs) & (SVs_PADTMP|SVs_TEMP))
1778 *MARK = TOPs;
1779 else
1780 *MARK = sv_mortalcopy(TOPs);
09256e2f 1781 } else {
54310121 1782 MEXTEND(mark,0);
3280af22 1783 *MARK = &PL_sv_undef;
a0d0e21e 1784 }
54310121 1785 SP = MARK;
a0d0e21e 1786 }
54310121 1787 else if (gimme == G_ARRAY) {
a1f49e72 1788 /* in case LEAVE wipes old return values */
a3b680e6 1789 register SV **mark;
a1f49e72
CS
1790 for (mark = newsp + 1; mark <= SP; mark++) {
1791 if (!(SvFLAGS(*mark) & (SVs_PADTMP|SVs_TEMP))) {
a0d0e21e 1792 *mark = sv_mortalcopy(*mark);
a1f49e72
CS
1793 TAINT_NOT; /* Each item is independent */
1794 }
1795 }
a0d0e21e 1796 }
3280af22 1797 PL_curpm = newpm; /* Don't pop $1 et al till now */
a0d0e21e
LW
1798
1799 LEAVE;
1800
1801 RETURN;
1802}
1803
1804PP(pp_iter)
1805{
39644a26 1806 dSP;
c09156bb 1807 register PERL_CONTEXT *cx;
dc09a129 1808 SV *sv, *oldsv;
4633a7c4 1809 AV* av;
1d7c1841 1810 SV **itersvp;
a0d0e21e 1811
924508f0 1812 EXTEND(SP, 1);
a0d0e21e 1813 cx = &cxstack[cxstack_ix];
6b35e009 1814 if (CxTYPE(cx) != CXt_LOOP)
cea2e8a9 1815 DIE(aTHX_ "panic: pp_iter");
a0d0e21e 1816
1d7c1841 1817 itersvp = CxITERVAR(cx);
4633a7c4 1818 av = cx->blk_loop.iterary;
89ea2908
GA
1819 if (SvTYPE(av) != SVt_PVAV) {
1820 /* iterate ($min .. $max) */
1821 if (cx->blk_loop.iterlval) {
1822 /* string increment */
1823 register SV* cur = cx->blk_loop.iterlval;
4fe3f0fa 1824 STRLEN maxlen = 0;
e1ec3a88 1825 const char *max = SvOK((SV*)av) ? SvPV((SV*)av, maxlen) : "";
89ea2908 1826 if (!SvNIOK(cur) && SvCUR(cur) <= maxlen) {
1d7c1841 1827 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1828 /* safe to reuse old SV */
1d7c1841 1829 sv_setsv(*itersvp, cur);
eaa5c2d6 1830 }
1c846c1f 1831 else
eaa5c2d6
GA
1832 {
1833 /* we need a fresh SV every time so that loop body sees a
1834 * completely new SV for closures/references to work as
1835 * they used to */
dc09a129 1836 oldsv = *itersvp;
1d7c1841 1837 *itersvp = newSVsv(cur);
dc09a129 1838 SvREFCNT_dec(oldsv);
eaa5c2d6 1839 }
89ea2908
GA
1840 if (strEQ(SvPVX(cur), max))
1841 sv_setiv(cur, 0); /* terminate next time */
1842 else
1843 sv_inc(cur);
1844 RETPUSHYES;
1845 }
1846 RETPUSHNO;
1847 }
1848 /* integer increment */
1849 if (cx->blk_loop.iterix > cx->blk_loop.itermax)
1850 RETPUSHNO;
7f61b687 1851
3db8f154 1852 /* don't risk potential race */
1d7c1841 1853 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1854 /* safe to reuse old SV */
1d7c1841 1855 sv_setiv(*itersvp, cx->blk_loop.iterix++);
eaa5c2d6 1856 }
1c846c1f 1857 else
eaa5c2d6
GA
1858 {
1859 /* we need a fresh SV every time so that loop body sees a
1860 * completely new SV for closures/references to work as they
1861 * used to */
dc09a129 1862 oldsv = *itersvp;
1d7c1841 1863 *itersvp = newSViv(cx->blk_loop.iterix++);
dc09a129 1864 SvREFCNT_dec(oldsv);
eaa5c2d6 1865 }
89ea2908
GA
1866 RETPUSHYES;
1867 }
1868
1869 /* iterate array */
ef3e5ea9
NC
1870 if (PL_op->op_private & OPpITER_REVERSED) {
1871 /* In reverse, use itermax as the min :-) */
c491ecac 1872 if (cx->blk_loop.iterix <= cx->blk_loop.itermax)
ef3e5ea9 1873 RETPUSHNO;
a0d0e21e 1874
ef3e5ea9
NC
1875 if (SvMAGICAL(av) || AvREIFY(av)) {
1876 SV **svp = av_fetch(av, cx->blk_loop.iterix--, FALSE);
1877 if (svp)
1878 sv = *svp;
1879 else
1880 sv = Nullsv;
1881 }
1882 else {
1883 sv = AvARRAY(av)[cx->blk_loop.iterix--];
1884 }
d42935ef
JH
1885 }
1886 else {
ef3e5ea9
NC
1887 if (cx->blk_loop.iterix >= (av == PL_curstack ? cx->blk_oldsp :
1888 AvFILL(av)))
1889 RETPUSHNO;
1890
1891 if (SvMAGICAL(av) || AvREIFY(av)) {
1892 SV **svp = av_fetch(av, ++cx->blk_loop.iterix, FALSE);
1893 if (svp)
1894 sv = *svp;
1895 else
1896 sv = Nullsv;
1897 }
1898 else {
1899 sv = AvARRAY(av)[++cx->blk_loop.iterix];
1900 }
d42935ef 1901 }
ef3e5ea9 1902
cccede53
DM
1903 if (sv && SvREFCNT(sv) == 0) {
1904 *itersvp = Nullsv;
b6c83531 1905 Perl_croak(aTHX_ "Use of freed value in iteration");
cccede53
DM
1906 }
1907
d42935ef 1908 if (sv)
a0d0e21e 1909 SvTEMP_off(sv);
a0d0e21e 1910 else
3280af22 1911 sv = &PL_sv_undef;
8b530633 1912 if (av != PL_curstack && sv == &PL_sv_undef) {
5f05dabc 1913 SV *lv = cx->blk_loop.iterlval;
71be2cbc
PP
1914 if (lv && SvREFCNT(lv) > 1) {
1915 SvREFCNT_dec(lv);
1916 lv = Nullsv;
1917 }
5f05dabc
PP
1918 if (lv)
1919 SvREFCNT_dec(LvTARG(lv));
1920 else {
68dc0745 1921 lv = cx->blk_loop.iterlval = NEWSV(26, 0);
5f05dabc 1922 sv_upgrade(lv, SVt_PVLV);
5f05dabc 1923 LvTYPE(lv) = 'y';
14befaf4 1924 sv_magic(lv, Nullsv, PERL_MAGIC_defelem, Nullch, 0);
5f05dabc
PP
1925 }
1926 LvTARG(lv) = SvREFCNT_inc(av);
1927 LvTARGOFF(lv) = cx->blk_loop.iterix;
42718184 1928 LvTARGLEN(lv) = (STRLEN)UV_MAX;
5f05dabc
PP
1929 sv = (SV*)lv;
1930 }
a0d0e21e 1931
dc09a129 1932 oldsv = *itersvp;
1d7c1841 1933 *itersvp = SvREFCNT_inc(sv);
dc09a129
DM
1934 SvREFCNT_dec(oldsv);
1935
a0d0e21e
LW
1936 RETPUSHYES;
1937}
1938
1939PP(pp_subst)
1940{
39644a26 1941 dSP; dTARG;
a0d0e21e
LW
1942 register PMOP *pm = cPMOP;
1943 PMOP *rpm = pm;
1944 register SV *dstr;
1945 register char *s;
1946 char *strend;
1947 register char *m;
1948 char *c;
1949 register char *d;
1950 STRLEN clen;
1951 I32 iters = 0;
1952 I32 maxiters;
1953 register I32 i;
1954 bool once;
71be2cbc 1955 bool rxtainted;
a0d0e21e 1956 char *orig;
22e551b9 1957 I32 r_flags;
aaa362c4 1958 register REGEXP *rx = PM_GETRE(pm);
a0d0e21e
LW
1959 STRLEN len;
1960 int force_on_match = 0;
3280af22 1961 I32 oldsave = PL_savestack_ix;
792b2c16 1962 STRLEN slen;
f272994b 1963 bool doutf8 = FALSE;
ed252734
NC
1964#ifdef PERL_COPY_ON_WRITE
1965 bool is_cow;
1966#endif
db79b45b 1967 SV *nsv = Nullsv;
a0d0e21e 1968
5cd24f17
PP
1969 /* known replacement string? */
1970 dstr = (pm->op_pmflags & PMf_CONST) ? POPs : Nullsv;
533c011a 1971 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 1972 TARG = POPs;
59f00321
RGS
1973 else if (PL_op->op_private & OPpTARGET_MY)
1974 GETTARGET;
a0d0e21e 1975 else {
54b9620d 1976 TARG = DEFSV;
a0d0e21e 1977 EXTEND(SP,1);
1c846c1f 1978 }
d9f424b2 1979
ed252734
NC
1980#ifdef PERL_COPY_ON_WRITE
1981 /* Awooga. Awooga. "bool" types that are actually char are dangerous,
1982 because they make integers such as 256 "false". */
1983 is_cow = SvIsCOW(TARG) ? TRUE : FALSE;
1984#else
765f542d
NC
1985 if (SvIsCOW(TARG))
1986 sv_force_normal_flags(TARG,0);
ed252734
NC
1987#endif
1988 if (
1989#ifdef PERL_COPY_ON_WRITE
1990 !is_cow &&
1991#endif
1992 (SvREADONLY(TARG)
4ce457a6
TP
1993 || ( (SvTYPE(TARG) == SVt_PVGV || SvTYPE(TARG) > SVt_PVLV)
1994 && !(SvTYPE(TARG) == SVt_PVGV && SvFAKE(TARG)))))
d470f89e 1995 DIE(aTHX_ PL_no_modify);
8ec5e241
NIS
1996 PUTBACK;
1997
a0d0e21e 1998 s = SvPV(TARG, len);
68dc0745 1999 if (!SvPOKp(TARG) || SvTYPE(TARG) == SVt_PVGV)
a0d0e21e 2000 force_on_match = 1;
b3eb6a9b 2001 rxtainted = ((pm->op_pmdynflags & PMdf_TAINTED) ||
3280af22
NIS
2002 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
2003 if (PL_tainted)
b3eb6a9b 2004 rxtainted |= 2;
9212bbba 2005 TAINT_NOT;
a12c0f56 2006
a30b2f1f 2007 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 2008
a0d0e21e
LW
2009 force_it:
2010 if (!pm || !s)
2269b42e 2011 DIE(aTHX_ "panic: pp_subst");
a0d0e21e
LW
2012
2013 strend = s + len;
a30b2f1f 2014 slen = RX_MATCH_UTF8(rx) ? utf8_length((U8*)s, (U8*)strend) : len;
792b2c16
JH
2015 maxiters = 2 * slen + 10; /* We can match twice at each
2016 position, once with zero-length,
2017 second time with non-zero. */
a0d0e21e 2018
3280af22
NIS
2019 if (!rx->prelen && PL_curpm) {
2020 pm = PL_curpm;
aaa362c4 2021 rx = PM_GETRE(pm);
a0d0e21e 2022 }
22e551b9 2023 r_flags = (rx->nparens || SvTEMP(TARG) || PL_sawampersand)
ed252734 2024 ? REXEC_COPY_STR : 0;
f722798b 2025 if (SvSCREAM(TARG))
22e551b9 2026 r_flags |= REXEC_SCREAM;
7fba1cd6 2027
a0d0e21e 2028 orig = m = s;
f722798b 2029 if (rx->reganch & RE_USE_INTUIT) {
ee0b7718 2030 PL_bostr = orig;
f722798b
IZ
2031 s = CALLREG_INTUIT_START(aTHX_ rx, TARG, s, strend, r_flags, NULL);
2032
2033 if (!s)
2034 goto nope;
2035 /* How to do it in subst? */
2036/* if ( (rx->reganch & ROPT_CHECK_ALL)
1c846c1f 2037 && !PL_sawampersand
f722798b
IZ
2038 && ((rx->reganch & ROPT_NOSCAN)
2039 || !((rx->reganch & RE_INTUIT_TAIL)
2040 && (r_flags & REXEC_SCREAM))))
2041 goto yup;
2042*/
a0d0e21e 2043 }
71be2cbc
PP
2044
2045 /* only replace once? */
a0d0e21e 2046 once = !(rpm->op_pmflags & PMf_GLOBAL);
71be2cbc
PP
2047
2048 /* known replacement string? */
f272994b 2049 if (dstr) {
8514a05a
JH
2050 /* replacement needing upgrading? */
2051 if (DO_UTF8(TARG) && !doutf8) {
db79b45b 2052 nsv = sv_newmortal();
4a176938 2053 SvSetSV(nsv, dstr);
8514a05a
JH
2054 if (PL_encoding)
2055 sv_recode_to_utf8(nsv, PL_encoding);
2056 else
2057 sv_utf8_upgrade(nsv);
2058 c = SvPV(nsv, clen);
4a176938
JH
2059 doutf8 = TRUE;
2060 }
2061 else {
2062 c = SvPV(dstr, clen);
2063 doutf8 = DO_UTF8(dstr);
8514a05a 2064 }
f272994b
A
2065 }
2066 else {
2067 c = Nullch;
2068 doutf8 = FALSE;
2069 }
2070
71be2cbc 2071 /* can do inplace substitution? */
ed252734
NC
2072 if (c
2073#ifdef PERL_COPY_ON_WRITE
2074 && !is_cow
2075#endif
2076 && (I32)clen <= rx->minlen && (once || !(r_flags & REXEC_COPY_STR))
db79b45b
JH
2077 && !(rx->reganch & ROPT_LOOKBEHIND_SEEN)
2078 && (!doutf8 || SvUTF8(TARG))) {
f722798b
IZ
2079 if (!CALLREGEXEC(aTHX_ rx, s, strend, orig, 0, TARG, NULL,
2080 r_flags | REXEC_CHECKED))
2081 {
8ec5e241 2082 SPAGAIN;
3280af22 2083 PUSHs(&PL_sv_no);
71be2cbc
PP
2084 LEAVE_SCOPE(oldsave);
2085 RETURN;
2086 }
ed252734
NC
2087#ifdef PERL_COPY_ON_WRITE
2088 if (SvIsCOW(TARG)) {
2089 assert (!force_on_match);
2090 goto have_a_cow;
2091 }
2092#endif
71be2cbc
PP
2093 if (force_on_match) {
2094 force_on_match = 0;
2095 s = SvPV_force(TARG, len);
2096 goto force_it;
2097 }
71be2cbc 2098 d = s;
3280af22 2099 PL_curpm = pm;
71be2cbc
PP
2100 SvSCREAM_off(TARG); /* disable possible screamer */
2101 if (once) {
48c036b1 2102 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d
IZ
2103 m = orig + rx->startp[0];
2104 d = orig + rx->endp[0];
71be2cbc
PP
2105 s = orig;
2106 if (m - s > strend - d) { /* faster to shorten from end */
2107 if (clen) {
2108 Copy(c, m, clen, char);
2109 m += clen;
a0d0e21e 2110 }
71be2cbc
PP
2111 i = strend - d;
2112 if (i > 0) {
2113 Move(d, m, i, char);
2114 m += i;
a0d0e21e 2115 }
71be2cbc
PP
2116 *m = '\0';
2117 SvCUR_set(TARG, m - s);
2118 }
2119 /*SUPPRESS 560*/
155aba94 2120 else if ((i = m - s)) { /* faster from front */
71be2cbc
PP
2121 d -= clen;
2122 m = d;
2123 sv_chop(TARG, d-i);
2124 s += i;
2125 while (i--)
2126 *--d = *--s;
2127 if (clen)
2128 Copy(c, m, clen, char);
2129 }
2130 else if (clen) {
2131 d -= clen;
2132 sv_chop(TARG, d);
2133 Copy(c, d, clen, char);
2134 }
2135 else {
2136 sv_chop(TARG, d);
2137 }
48c036b1 2138 TAINT_IF(rxtainted & 1);
8ec5e241 2139 SPAGAIN;
3280af22 2140 PUSHs(&PL_sv_yes);
71be2cbc
PP
2141 }
2142 else {
71be2cbc
PP
2143 do {
2144 if (iters++ > maxiters)
cea2e8a9 2145 DIE(aTHX_ "Substitution loop");
d9f97599 2146 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d 2147 m = rx->startp[0] + orig;
71be2cbc 2148 /*SUPPRESS 560*/
155aba94 2149 if ((i = m - s)) {
71be2cbc
PP
2150 if (s != d)
2151 Move(s, d, i, char);
2152 d += i;
a0d0e21e 2153 }
71be2cbc
PP
2154 if (clen) {
2155 Copy(c, d, clen, char);
2156 d += clen;
2157 }
cf93c79d 2158 s = rx->endp[0] + orig;
cea2e8a9 2159 } while (CALLREGEXEC(aTHX_ rx, s, strend, orig, s == m,
f722798b
IZ
2160 TARG, NULL,
2161 /* don't match same null twice */
2162 REXEC_NOT_FIRST|REXEC_IGNOREPOS));
71be2cbc
PP
2163 if (s != d) {
2164 i = strend - s;
2165 SvCUR_set(TARG, d - SvPVX(TARG) + i);
2166 Move(s, d, i+1, char); /* include the NUL */
a0d0e21e 2167 }
48c036b1 2168 TAINT_IF(rxtainted & 1);
8ec5e241 2169 SPAGAIN;
71be2cbc 2170 PUSHs(sv_2mortal(newSViv((I32)iters)));
a0d0e21e 2171 }
80b498e0 2172 (void)SvPOK_only_UTF8(TARG);
48c036b1 2173 TAINT_IF(rxtainted);
8ec5e241
NIS
2174 if (SvSMAGICAL(TARG)) {
2175 PUTBACK;
2176 mg_set(TARG);
2177 SPAGAIN;
2178 }
9212bbba 2179 SvTAINT(TARG);
aefe6dfc
JH
2180 if (doutf8)
2181 SvUTF8_on(TARG);
71be2cbc
PP
2182 LEAVE_SCOPE(oldsave);
2183 RETURN;
a0d0e21e 2184 }
71be2cbc 2185
f722798b
IZ
2186 if (CALLREGEXEC(aTHX_ rx, s, strend, orig, 0, TARG, NULL,
2187 r_flags | REXEC_CHECKED))
2188 {
a0d0e21e
LW
2189 if (force_on_match) {
2190 force_on_match = 0;
2191 s = SvPV_force(TARG, len);
2192 goto force_it;
2193 }
ed252734
NC
2194#ifdef PERL_COPY_ON_WRITE
2195 have_a_cow:
2196#endif
48c036b1 2197 rxtainted |= RX_MATCH_TAINTED(rx);
f2b990bf 2198 dstr = newSVpvn(m, s-m);
ffc61ed2
JH
2199 if (DO_UTF8(TARG))
2200 SvUTF8_on(dstr);
3280af22 2201 PL_curpm = pm;
a0d0e21e 2202 if (!c) {
c09156bb 2203 register PERL_CONTEXT *cx;
8ec5e241 2204 SPAGAIN;
d8f2cf8a 2205 ReREFCNT_inc(rx);
a0d0e21e
LW
2206 PUSHSUBST(cx);
2207 RETURNOP(cPMOP->op_pmreplroot);
2208 }
cf93c79d 2209 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
2210 do {
2211 if (iters++ > maxiters)
cea2e8a9 2212 DIE(aTHX_ "Substitution loop");
d9f97599 2213 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d 2214 if (RX_MATCH_COPIED(rx) && rx->subbeg != orig) {
a0d0e21e
LW
2215 m = s;
2216 s = orig;
cf93c79d 2217 orig = rx->subbeg;
a0d0e21e
LW
2218 s = orig + (m - s);
2219 strend = s + (strend - m);
2220 }
cf93c79d 2221 m = rx->startp[0] + orig;
db79b45b
JH
2222 if (doutf8 && !SvUTF8(dstr))
2223 sv_catpvn_utf8_upgrade(dstr, s, m - s, nsv);
2224 else
2225 sv_catpvn(dstr, s, m-s);
cf93c79d 2226 s = rx->endp[0] + orig;
a0d0e21e
LW
2227 if (clen)
2228 sv_catpvn(dstr, c, clen);
2229 if (once)
2230 break;
ffc61ed2
JH
2231 } while (CALLREGEXEC(aTHX_ rx, s, strend, orig, s == m,
2232 TARG, NULL, r_flags));
db79b45b
JH
2233 if (doutf8 && !DO_UTF8(TARG))
2234 sv_catpvn_utf8_upgrade(dstr, s, strend - s, nsv);
89afcb60
A
2235 else
2236 sv_catpvn(dstr, s, strend - s);
748a9306 2237
ed252734
NC
2238#ifdef PERL_COPY_ON_WRITE
2239 /* The match may make the string COW. If so, brilliant, because that's
2240 just saved us one malloc, copy and free - the regexp has donated
2241 the old buffer, and we malloc an entirely new one, rather than the
2242 regexp malloc()ing a buffer and copying our original, only for
2243 us to throw it away here during the substitution. */
2244 if (SvIsCOW(TARG)) {
2245 sv_force_normal_flags(TARG, SV_COW_DROP_PV);
2246 } else
2247#endif
2248 {
8bd4d4c5 2249 SvPV_free(TARG);
ed252734 2250 }
f880fe2f 2251 SvPV_set(TARG, SvPVX(dstr));
748a9306
LW
2252 SvCUR_set(TARG, SvCUR(dstr));
2253 SvLEN_set(TARG, SvLEN(dstr));
f272994b 2254 doutf8 |= DO_UTF8(dstr);
f880fe2f 2255 SvPV_set(dstr, (char*)0);
748a9306
LW
2256 sv_free(dstr);
2257
48c036b1 2258 TAINT_IF(rxtainted & 1);
f878fbec 2259 SPAGAIN;
48c036b1
GS
2260 PUSHs(sv_2mortal(newSViv((I32)iters)));
2261
a0d0e21e 2262 (void)SvPOK_only(TARG);
f272994b 2263 if (doutf8)
60aeb6fd 2264 SvUTF8_on(TARG);
48c036b1 2265 TAINT_IF(rxtainted);
a0d0e21e 2266 SvSETMAGIC(TARG);
9212bbba 2267 SvTAINT(TARG);
4633a7c4 2268 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2269 RETURN;
2270 }
5cd24f17 2271 goto ret_no;
a0d0e21e
LW
2272
2273nope:
1c846c1f 2274ret_no:
8ec5e241 2275 SPAGAIN;
3280af22 2276 PUSHs(&PL_sv_no);
4633a7c4 2277 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2278 RETURN;
2279}
2280
2281PP(pp_grepwhile)
2282{
27da23d5 2283 dVAR; dSP;
a0d0e21e
LW
2284
2285 if (SvTRUEx(POPs))
3280af22
NIS
2286 PL_stack_base[PL_markstack_ptr[-1]++] = PL_stack_base[*PL_markstack_ptr];
2287 ++*PL_markstack_ptr;
a0d0e21e
LW
2288 LEAVE; /* exit inner scope */
2289
2290 /* All done yet? */
3280af22 2291 if (PL_stack_base + *PL_markstack_ptr > SP) {
a0d0e21e 2292 I32 items;
54310121 2293 I32 gimme = GIMME_V;
a0d0e21e
LW
2294
2295 LEAVE; /* exit outer scope */
2296 (void)POPMARK; /* pop src */
3280af22 2297 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 2298 (void)POPMARK; /* pop dst */
3280af22 2299 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 2300 if (gimme == G_SCALAR) {
7cc47870
RGS
2301 if (PL_op->op_private & OPpGREP_LEX) {
2302 SV* sv = sv_newmortal();
2303 sv_setiv(sv, items);
2304 PUSHs(sv);
2305 }
2306 else {
2307 dTARGET;
2308 XPUSHi(items);
2309 }
a0d0e21e 2310 }
54310121
PP
2311 else if (gimme == G_ARRAY)
2312 SP += items;
a0d0e21e
LW
2313 RETURN;
2314 }
2315 else {
2316 SV *src;
2317
2318 ENTER; /* enter inner scope */
1d7c1841 2319 SAVEVPTR(PL_curpm);
a0d0e21e 2320
3280af22 2321 src = PL_stack_base[*PL_markstack_ptr];
a0d0e21e 2322 SvTEMP_off(src);
59f00321
RGS
2323 if (PL_op->op_private & OPpGREP_LEX)
2324 PAD_SVl(PL_op->op_targ) = src;
2325 else
2326 DEFSV = src;
a0d0e21e
LW
2327
2328 RETURNOP(cLOGOP->op_other);
2329 }
2330}
2331
2332PP(pp_leavesub)
2333{
27da23d5 2334 dVAR; dSP;
a0d0e21e
LW
2335 SV **mark;
2336 SV **newsp;
2337 PMOP *newpm;
2338 I32 gimme;
c09156bb 2339 register PERL_CONTEXT *cx;
b0d9ce38 2340 SV *sv;
a0d0e21e
LW
2341
2342 POPBLOCK(cx,newpm);
5dd42e15 2343 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2344
a1f49e72 2345 TAINT_NOT;
a0d0e21e
LW
2346 if (gimme == G_SCALAR) {
2347 MARK = newsp + 1;
a29cdaf0 2348 if (MARK <= SP) {
a8bba7fa 2349 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
a29cdaf0
IZ
2350 if (SvTEMP(TOPs)) {
2351 *MARK = SvREFCNT_inc(TOPs);
2352 FREETMPS;
2353 sv_2mortal(*MARK);
cd06dffe
GS
2354 }
2355 else {
959e3673 2356 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
a29cdaf0 2357 FREETMPS;
959e3673
GS
2358 *MARK = sv_mortalcopy(sv);
2359 SvREFCNT_dec(sv);
a29cdaf0 2360 }
cd06dffe
GS
2361 }
2362 else
a29cdaf0 2363 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
cd06dffe
GS
2364 }
2365 else {
f86702cc 2366 MEXTEND(MARK, 0);
3280af22 2367 *MARK = &PL_sv_undef;
a0d0e21e
LW
2368 }
2369 SP = MARK;
2370 }
54310121 2371 else if (gimme == G_ARRAY) {
f86702cc 2372 for (MARK = newsp + 1; MARK <= SP; MARK++) {
a1f49e72 2373 if (!SvTEMP(*MARK)) {
f86702cc 2374 *MARK = sv_mortalcopy(*MARK);
a1f49e72
CS
2375 TAINT_NOT; /* Each item is independent */
2376 }
f86702cc 2377 }
a0d0e21e 2378 }
f86702cc 2379 PUTBACK;
1c846c1f 2380
5dd42e15
DM
2381 LEAVE;
2382 cxstack_ix--;
b0d9ce38 2383 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
3280af22 2384 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e 2385
b0d9ce38 2386 LEAVESUB(sv);
f39bc417 2387 return cx->blk_sub.retop;
a0d0e21e
LW
2388}
2389
cd06dffe
GS
2390/* This duplicates the above code because the above code must not
2391 * get any slower by more conditions */
2392PP(pp_leavesublv)
2393{
27da23d5 2394 dVAR; dSP;
cd06dffe
GS
2395 SV **mark;
2396 SV **newsp;
2397 PMOP *newpm;
2398 I32 gimme;
2399 register PERL_CONTEXT *cx;
b0d9ce38 2400 SV *sv;
cd06dffe
GS
2401
2402 POPBLOCK(cx,newpm);
5dd42e15 2403 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2404
cd06dffe
GS
2405 TAINT_NOT;
2406
2407 if (cx->blk_sub.lval & OPpENTERSUB_INARGS) {
2408 /* We are an argument to a function or grep().
2409 * This kind of lvalueness was legal before lvalue
2410 * subroutines too, so be backward compatible:
2411 * cannot report errors. */
2412
2413 /* Scalar context *is* possible, on the LHS of -> only,
2414 * as in f()->meth(). But this is not an lvalue. */
2415 if (gimme == G_SCALAR)
2416 goto temporise;
2417 if (gimme == G_ARRAY) {
a8bba7fa 2418 if (!CvLVALUE(cx->blk_sub.cv))
cd06dffe
GS
2419 goto temporise_array;
2420 EXTEND_MORTAL(SP - newsp);
2421 for (mark = newsp + 1; mark <= SP; mark++) {
2422 if (SvTEMP(*mark))
2423 /* empty */ ;
2424 else if (SvFLAGS(*mark) & (SVs_PADTMP | SVf_READONLY))
2425 *mark = sv_mortalcopy(*mark);
2426 else {
2427 /* Can be a localized value subject to deletion. */
2428 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2429 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2430 }
2431 }
2432 }
2433 }
2434 else if (cx->blk_sub.lval) { /* Leave it as it is if we can. */
2435 /* Here we go for robustness, not for speed, so we change all
2436 * the refcounts so the caller gets a live guy. Cannot set
2437 * TEMP, so sv_2mortal is out of question. */
a8bba7fa 2438 if (!CvLVALUE(cx->blk_sub.cv)) {
5dd42e15
DM
2439 LEAVE;
2440 cxstack_ix--;
b0d9ce38 2441 POPSUB(cx,sv);
d470f89e 2442 PL_curpm = newpm;
b0d9ce38 2443 LEAVESUB(sv);
d470f89e
GS
2444 DIE(aTHX_ "Can't modify non-lvalue subroutine call");
2445 }
cd06dffe
GS
2446 if (gimme == G_SCALAR) {
2447 MARK = newsp + 1;
2448 EXTEND_MORTAL(1);
2449 if (MARK == SP) {
d470f89e 2450 if (SvFLAGS(TOPs) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
5dd42e15
DM
2451 LEAVE;
2452 cxstack_ix--;
b0d9ce38 2453 POPSUB(cx,sv);
d470f89e 2454 PL_curpm = newpm;
b0d9ce38 2455 LEAVESUB(sv);
e9f19e3c
HS
2456 DIE(aTHX_ "Can't return %s from lvalue subroutine",
2457 SvREADONLY(TOPs) ? (TOPs == &PL_sv_undef) ? "undef"
2458 : "a readonly value" : "a temporary");
d470f89e 2459 }
cd06dffe
GS
2460 else { /* Can be a localized value
2461 * subject to deletion. */
2462 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2463 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2464 }
2465 }
d470f89e 2466 else { /* Should not happen? */
5dd42e15
DM
2467 LEAVE;
2468 cxstack_ix--;
b0d9ce38 2469 POPSUB(cx,sv);
d470f89e 2470 PL_curpm = newpm;
b0d9ce38 2471 LEAVESUB(sv);
d470f89e 2472 DIE(aTHX_ "%s returned from lvalue subroutine in scalar context",
cd06dffe 2473 (MARK > SP ? "Empty array" : "Array"));
d470f89e 2474 }
cd06dffe
GS
2475 SP = MARK;
2476 }
2477 else if (gimme == G_ARRAY) {
2478 EXTEND_MORTAL(SP - newsp);
2479 for (mark = newsp + 1; mark <= SP; mark++) {
f206cdda
AMS
2480 if (*mark != &PL_sv_undef
2481 && SvFLAGS(*mark) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
d470f89e
GS
2482 /* Might be flattened array after $#array = */
2483 PUTBACK;
5dd42e15
DM
2484 LEAVE;
2485 cxstack_ix--;
b0d9ce38 2486 POPSUB(cx,sv);
d470f89e 2487 PL_curpm = newpm;
b0d9ce38 2488 LEAVESUB(sv);
f206cdda
AMS
2489 DIE(aTHX_ "Can't return a %s from lvalue subroutine",
2490 SvREADONLY(TOPs) ? "readonly value" : "temporary");
d470f89e 2491 }
cd06dffe 2492 else {
cd06dffe
GS
2493 /* Can be a localized value subject to deletion. */
2494 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2495 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2496 }
2497 }
2498 }
2499 }
2500 else {
2501 if (gimme == G_SCALAR) {
2502 temporise:
2503 MARK = newsp + 1;
2504 if (MARK <= SP) {
a8bba7fa 2505 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
cd06dffe
GS
2506 if (SvTEMP(TOPs)) {
2507 *MARK = SvREFCNT_inc(TOPs);
2508 FREETMPS;
2509 sv_2mortal(*MARK);
2510 }
2511 else {
959e3673 2512 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
cd06dffe 2513 FREETMPS;
959e3673
GS
2514 *MARK = sv_mortalcopy(sv);
2515 SvREFCNT_dec(sv);
cd06dffe
GS
2516 }
2517 }
2518 else
2519 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
2520 }
2521 else {
2522 MEXTEND(MARK, 0);
2523 *MARK = &PL_sv_undef;
2524 }
2525 SP = MARK;
2526 }
2527 else if (gimme == G_ARRAY) {
2528 temporise_array:
2529 for (MARK = newsp + 1; MARK <= SP; MARK++) {
2530 if (!SvTEMP(*MARK)) {
2531 *MARK = sv_mortalcopy(*MARK);
2532 TAINT_NOT; /* Each item is independent */
2533 }
2534 }
2535 }
2536 }
2537 PUTBACK;
1c846c1f 2538
5dd42e15
DM
2539 LEAVE;
2540 cxstack_ix--;
b0d9ce38 2541 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
cd06dffe
GS
2542 PL_curpm = newpm; /* ... and pop $1 et al */
2543
b0d9ce38 2544 LEAVESUB(sv);
f39bc417 2545 return cx->blk_sub.retop;
cd06dffe
GS
2546}
2547
2548
76e3520e 2549STATIC CV *
cea2e8a9 2550S_get_db_sub(pTHX_ SV **svp, CV *cv)
3de9ffa1 2551{
3280af22 2552 SV *dbsv = GvSV(PL_DBsub);
491527d0 2553
f398eb67 2554 save_item(dbsv);
491527d0
GS
2555 if (!PERLDB_SUB_NN) {
2556 GV *gv = CvGV(cv);
2557
491527d0 2558 if ( (CvFLAGS(cv) & (CVf_ANON | CVf_CLONED))
1c846c1f 2559 || strEQ(GvNAME(gv), "END")
491527d0
GS
2560 || ((GvCV(gv) != cv) && /* Could be imported, and old sub redefined. */
2561 !( (SvTYPE(*svp) == SVt_PVGV) && (GvCV((GV*)*svp) == cv)
2562 && (gv = (GV*)*svp) ))) {
2563 /* Use GV from the stack as a fallback. */
2564 /* GV is potentially non-unique, or contain different CV. */
c2e66d9e
GS
2565 SV *tmp = newRV((SV*)cv);
2566 sv_setsv(dbsv, tmp);
2567 SvREFCNT_dec(tmp);
491527d0
GS
2568 }
2569 else {
2570 gv_efullname3(dbsv, gv, Nullch);
2571 }
3de9ffa1
MB
2572 }
2573 else {
a9c4fd4e 2574 const int type = SvTYPE(dbsv);
f398eb67
NC
2575 if (type < SVt_PVIV && type != SVt_IV)
2576 sv_upgrade(dbsv, SVt_PVIV);
155aba94 2577 (void)SvIOK_on(dbsv);
45977657 2578 SvIV_set(dbsv, PTR2IV(cv)); /* Do it the quickest way */
3de9ffa1 2579 }
491527d0 2580
3de9ffa1 2581 if (CvXSUB(cv))
3280af22
NIS
2582 PL_curcopdb = PL_curcop;
2583 cv = GvCV(PL_DBsub);
3de9ffa1
MB
2584 return cv;
2585}
2586
a0d0e21e
LW
2587PP(pp_entersub)
2588{
27da23d5 2589 dVAR; dSP; dPOPss;
a0d0e21e
LW
2590 GV *gv;
2591 HV *stash;
2592 register CV *cv;
c09156bb 2593 register PERL_CONTEXT *cx;
5d94fbed 2594 I32 gimme;
a9c4fd4e 2595 const bool hasargs = (PL_op->op_flags & OPf_STACKED) != 0;
a0d0e21e
LW
2596
2597 if (!sv)
cea2e8a9 2598 DIE(aTHX_ "Not a CODE reference");
a0d0e21e 2599 switch (SvTYPE(sv)) {
f1025168
NC
2600 /* This is overwhelming the most common case: */
2601 case SVt_PVGV:
2602 if (!(cv = GvCVu((GV*)sv)))
2603 cv = sv_2cv(sv, &stash, &gv, FALSE);
2604 if (!cv) {
2605 ENTER;
2606 SAVETMPS;
2607 goto try_autoload;
2608 }
2609 break;
a0d0e21e
LW
2610 default:
2611 if (!SvROK(sv)) {
a9c4fd4e 2612 const char *sym;
3280af22 2613 if (sv == &PL_sv_yes) { /* unfound import, ignore */
fb73857a 2614 if (hasargs)
3280af22 2615 SP = PL_stack_base + POPMARK;
a0d0e21e 2616 RETURN;
fb73857a 2617 }
15ff848f
CS
2618 if (SvGMAGICAL(sv)) {
2619 mg_get(sv);
f5f1d18e
AMS
2620 if (SvROK(sv))
2621 goto got_rv;
15ff848f
CS
2622 sym = SvPOKp(sv) ? SvPVX(sv) : Nullch;
2623 }
a9c4fd4e
AL
2624 else {
2625 STRLEN n_a;
2d8e6c8d 2626 sym = SvPV(sv, n_a);
a9c4fd4e 2627 }
15ff848f 2628 if (!sym)
cea2e8a9 2629 DIE(aTHX_ PL_no_usym, "a subroutine");
533c011a 2630 if (PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 2631 DIE(aTHX_ PL_no_symref, sym, "a subroutine");
864dbfa3 2632 cv = get_cv(sym, TRUE);
a0d0e21e
LW
2633 break;
2634 }
f5f1d18e 2635 got_rv:
f5284f61
IZ
2636 {
2637 SV **sp = &sv; /* Used in tryAMAGICunDEREF macro. */
2638 tryAMAGICunDEREF(to_cv);
2639 }
a0d0e21e
LW
2640 cv = (CV*)SvRV(sv);
2641 if (SvTYPE(cv) == SVt_PVCV)
2642 break;
2643 /* FALL THROUGH */
2644 case SVt_PVHV:
2645 case SVt_PVAV:
cea2e8a9 2646 DIE(aTHX_ "Not a CODE reference");
f1025168 2647 /* This is the second most common case: */
a0d0e21e
LW
2648 case SVt_PVCV:
2649 cv = (CV*)sv;
2650 break;
a0d0e21e
LW
2651 }
2652
2653 ENTER;
2654 SAVETMPS;
2655
2656 retry:
a0d0e21e 2657 if (!CvROOT(cv) && !CvXSUB(cv)) {
f1025168 2658 goto fooey;
a0d0e21e
LW
2659 }
2660
54310121 2661 gimme = GIMME_V;
67caa1fe 2662 if ((PL_op->op_private & OPpENTERSUB_DB) && GvCV(PL_DBsub) && !CvNODEBUG(cv)) {
06492da6
SF
2663 if (CvASSERTION(cv) && PL_DBassertion)
2664 sv_setiv(PL_DBassertion, 1);
2665
4f01c5a5 2666 cv = get_db_sub(&sv, cv);
ccafdc96
RGS
2667 if (!cv || (!CvXSUB(cv) && !CvSTART(cv)))
2668 DIE(aTHX_ "No DB::sub routine defined");
67caa1fe 2669 }
a0d0e21e 2670
f1025168
NC
2671 if (!(CvXSUB(cv))) {
2672 /* This path taken at least 75% of the time */
a0d0e21e
LW
2673 dMARK;
2674 register I32 items = SP - MARK;
a0d0e21e 2675 AV* padlist = CvPADLIST(cv);
a0d0e21e
LW
2676 PUSHBLOCK(cx, CXt_SUB, MARK);
2677 PUSHSUB(cx);
f39bc417 2678 cx->blk_sub.retop = PL_op->op_next;
a0d0e21e 2679 CvDEPTH(cv)++;
6b35e009
GS
2680 /* XXX This would be a natural place to set C<PL_compcv = cv> so
2681 * that eval'' ops within this sub know the correct lexical space.
a3985cdc
DM
2682 * Owing the speed considerations, we choose instead to search for
2683 * the cv using find_runcv() when calling doeval().
6b35e009 2684 */
b36bdeca 2685 if (CvDEPTH(cv) >= 2) {
1d7c1841 2686 PERL_STACK_OVERFLOW_CHECK();
26019298 2687 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2688 }
dd2155a4 2689 PAD_SET_CUR(padlist, CvDEPTH(cv));
6d4ff0d2 2690 if (hasargs)
6d4ff0d2
MB
2691 {
2692 AV* av;
77a005ab 2693#if 0
bf49b057 2694 DEBUG_S(PerlIO_printf(Perl_debug_log,
0f15f207 2695 "%p entersub preparing @_\n", thr));
77a005ab 2696#endif
dd2155a4 2697 av = (AV*)PAD_SVl(0);
221373f0
GS
2698 if (AvREAL(av)) {
2699 /* @_ is normally not REAL--this should only ever
2700 * happen when DB::sub() calls things that modify @_ */
2701 av_clear(av);
2702 AvREAL_off(av);
2703 AvREIFY_on(av);
2704 }
3280af22
NIS
2705 cx->blk_sub.savearray = GvAV(PL_defgv);
2706 GvAV(PL_defgv) = (AV*)SvREFCNT_inc(av);
dd2155a4 2707 CX_CURPAD_SAVE(cx->blk_sub);
6d4ff0d2 2708 cx->blk_sub.argarray = av;
a0d0e21e
LW
2709 ++MARK;
2710
2711 if (items > AvMAX(av) + 1) {
504618e9 2712 SV **ary = AvALLOC(av);
a0d0e21e
LW
2713 if (AvARRAY(av) != ary) {
2714 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
f880fe2f 2715 SvPV_set(av, (char*)ary);
a0d0e21e
LW
2716 }
2717 if (items > AvMAX(av) + 1) {
2718 AvMAX(av) = items - 1;
2719 Renew(ary,items,SV*);
2720 AvALLOC(av) = ary;
f880fe2f 2721 SvPV_set(av, (char*)ary);
a0d0e21e
LW
2722 }
2723 }
2724 Copy(MARK,AvARRAY(av),items,SV*);
93965878 2725 AvFILLp(av) = items - 1;
1c846c1f 2726
a0d0e21e
LW
2727 while (items--) {
2728 if (*MARK)
2729 SvTEMP_off(*MARK);
2730 MARK++;
2731 }
2732 }
4a925ff6
GS
2733 /* warning must come *after* we fully set up the context
2734 * stuff so that __WARN__ handlers can safely dounwind()
2735 * if they want to
2736 */
2737 if (CvDEPTH(cv) == 100 && ckWARN(WARN_RECURSION)
2738 && !(PERLDB_SUB && cv == GvCV(PL_DBsub)))
2739 sub_crush_depth(cv);
77a005ab 2740#if 0
bf49b057 2741 DEBUG_S(PerlIO_printf(Perl_debug_log,
0f15f207 2742 "%p entersub returning %p\n", thr, CvSTART(cv)));
77a005ab 2743#endif
a0d0e21e
LW
2744 RETURNOP(CvSTART(cv));
2745 }
f1025168
NC
2746 else {
2747#ifdef PERL_XSUB_OLDSTYLE
2748 if (CvOLDSTYLE(cv)) {
2749 I32 (*fp3)(int,int,int);
2750 dMARK;
2751 register I32 items = SP - MARK;
2752 /* We dont worry to copy from @_. */
2753 while (SP > mark) {
2754 SP[1] = SP[0];
2755 SP--;
2756 }
2757 PL_stack_sp = mark + 1;
2758 fp3 = (I32(*)(int,int,int))CvXSUB(cv);
2759 items = (*fp3)(CvXSUBANY(cv).any_i32,
2760 MARK - PL_stack_base + 1,
2761 items);
2762 PL_stack_sp = PL_stack_base + items;
2763 }
2764 else
2765#endif /* PERL_XSUB_OLDSTYLE */
2766 {
2767 I32 markix = TOPMARK;
2768
2769 PUTBACK;
2770
2771 if (!hasargs) {
2772 /* Need to copy @_ to stack. Alternative may be to
2773 * switch stack to @_, and copy return values
2774 * back. This would allow popping @_ in XSUB, e.g.. XXXX */
a3b680e6
AL
2775 AV * const av = GvAV(PL_defgv);
2776 const I32 items = AvFILLp(av) + 1; /* @_ is not tieable */
f1025168
NC
2777
2778 if (items) {
2779 /* Mark is at the end of the stack. */
2780 EXTEND(SP, items);
2781 Copy(AvARRAY(av), SP + 1, items, SV*);
2782 SP += items;
2783 PUTBACK ;
2784 }
2785 }
2786 /* We assume first XSUB in &DB::sub is the called one. */
2787 if (PL_curcopdb) {
2788 SAVEVPTR(PL_curcop);
2789 PL_curcop = PL_curcopdb;
2790 PL_curcopdb = NULL;
2791 }
2792 /* Do we need to open block here? XXXX */
2793 (void)(*CvXSUB(cv))(aTHX_ cv);
2794
2795 /* Enforce some sanity in scalar context. */
2796 if (gimme == G_SCALAR && ++markix != PL_stack_sp - PL_stack_base ) {
2797 if (markix > PL_stack_sp - PL_stack_base)
2798 *(PL_stack_base + markix) = &PL_sv_undef;
2799 else
2800 *(PL_stack_base + markix) = *PL_stack_sp;
2801 PL_stack_sp = PL_stack_base + markix;
2802 }
2803 }
2804 LEAVE;
2805 return NORMAL;
2806 }
2807
2808 assert (0); /* Cannot get here. */
2809 /* This is deliberately moved here as spaghetti code to keep it out of the
2810 hot path. */
2811 {
2812 GV* autogv;
2813 SV* sub_name;
2814
2815 fooey:
2816 /* anonymous or undef'd function leaves us no recourse */
2817 if (CvANON(cv) || !(gv = CvGV(cv)))
2818 DIE(aTHX_ "Undefined subroutine called");
2819
2820 /* autoloaded stub? */
2821 if (cv != GvCV(gv)) {
2822 cv = GvCV(gv);
2823 }
2824 /* should call AUTOLOAD now? */
2825 else {
2826try_autoload:
2827 if ((autogv = gv_autoload4(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv),
2828 FALSE)))
2829 {
2830 cv = GvCV(autogv);
2831 }
2832 /* sorry */
2833 else {
2834 sub_name = sv_newmortal();
2835 gv_efullname3(sub_name, gv, Nullch);
35c1215d 2836 DIE(aTHX_ "Undefined subroutine &%"SVf" called", sub_name);
f1025168
NC
2837 }
2838 }
2839 if (!cv)
2840 DIE(aTHX_ "Not a CODE reference");
2841 goto retry;
2842 }
a0d0e21e
LW
2843}
2844
44a8e56a 2845void
864dbfa3 2846Perl_sub_crush_depth(pTHX_ CV *cv)
44a8e56a
PP
2847{
2848 if (CvANON(cv))
9014280d 2849 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on anonymous subroutine");
44a8e56a
PP
2850 else {
2851 SV* tmpstr = sv_newmortal();
2852 gv_efullname3(tmpstr, CvGV(cv), Nullch);
35c1215d
NC
2853 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on subroutine \"%"SVf"\"",
2854 tmpstr);
44a8e56a
PP
2855 }
2856}
2857
a0d0e21e
LW
2858PP(pp_aelem)
2859{
39644a26 2860 dSP;
a0d0e21e 2861 SV** svp;
a3b680e6 2862 SV* const elemsv = POPs;
d804643f 2863 IV elem = SvIV(elemsv);
68dc0745 2864 AV* av = (AV*)POPs;
e1ec3a88
AL
2865 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
2866 const U32 defer = (PL_op->op_private & OPpLVAL_DEFER) && (elem > av_len(av));
be6c24e0 2867 SV *sv;
a0d0e21e 2868
e35c1634 2869 if (SvROK(elemsv) && !SvGAMAGIC(elemsv) && ckWARN(WARN_MISC))
35c1215d 2870 Perl_warner(aTHX_ packWARN(WARN_MISC), "Use of reference \"%"SVf"\" as array index", elemsv);
748a9306 2871 if (elem > 0)
3280af22 2872 elem -= PL_curcop->cop_arybase;
a0d0e21e
LW
2873 if (SvTYPE(av) != SVt_PVAV)
2874 RETPUSHUNDEF;
68dc0745 2875 svp = av_fetch(av, elem, lval && !defer);
a0d0e21e 2876 if (lval) {
2b573ace 2877#ifdef PERL_MALLOC_WRAP
2b573ace 2878 if (SvUOK(elemsv)) {
a9c4fd4e 2879 const UV uv = SvUV(elemsv);
2b573ace
JH
2880 elem = uv > IV_MAX ? IV_MAX : uv;
2881 }
2882 else if (SvNOK(elemsv))
2883 elem = (IV)SvNV(elemsv);
a3b680e6
AL
2884 if (elem > 0) {
2885 static const char oom_array_extend[] =
2886 "Out of memory during array extend"; /* Duplicated in av.c */
2b573ace 2887 MEM_WRAP_CHECK_1(elem,SV*,oom_array_extend);
a3b680e6 2888 }
2b573ace 2889#endif
3280af22 2890 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
2891 SV* lv;
2892 if (!defer)
cea2e8a9 2893 DIE(aTHX_ PL_no_aelem, elem);
68dc0745
PP
2894 lv = sv_newmortal();
2895 sv_upgrade(lv, SVt_PVLV);
2896 LvTYPE(lv) = 'y';
14befaf4 2897 sv_magic(lv, Nullsv, PERL_MAGIC_defelem, Nullch, 0);
68dc0745
PP
2898 LvTARG(lv) = SvREFCNT_inc(av);
2899 LvTARGOFF(lv) = elem;
2900 LvTARGLEN(lv) = 1;
2901 PUSHs(lv);
2902 RETURN;
2903 }
bfc4de9f 2904 if (PL_op->op_private & OPpLVAL_INTRO)
161b7d16 2905 save_aelem(av, elem, svp);
533c011a
NIS
2906 else if (PL_op->op_private & OPpDEREF)
2907 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 2908 }
3280af22 2909 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
2910 if (!lval && SvGMAGICAL(sv)) /* see note in pp_helem() */
2911 sv = sv_mortalcopy(sv);
2912 PUSHs(sv);
a0d0e21e
LW
2913 RETURN;
2914}
2915
02a9e968 2916void
864dbfa3 2917Perl_vivify_ref(pTHX_ SV *sv, U32 to_what)
02a9e968
CS
2918{
2919 if (SvGMAGICAL(sv))
2920 mg_get(sv);
2921 if (!SvOK(sv)) {
2922 if (SvREADONLY(sv))
cea2e8a9 2923 Perl_croak(aTHX_ PL_no_modify);
5f05dabc
PP
2924 if (SvTYPE(sv) < SVt_RV)
2925 sv_upgrade(sv, SVt_RV);
2926 else if (SvTYPE(sv) >= SVt_PV) {
8bd4d4c5 2927 SvPV_free(sv);
b162af07
SP
2928 SvLEN_set(sv, 0);
2929 SvCUR_set(sv, 0);
5f05dabc 2930 }
68dc0745 2931 switch (to_what) {
5f05dabc 2932 case OPpDEREF_SV:
b162af07 2933 SvRV_set(sv, NEWSV(355,0));
5f05dabc
PP
2934 break;
2935 case OPpDEREF_AV:
b162af07 2936 SvRV_set(sv, (SV*)newAV());
5f05dabc
PP
2937 break;
2938 case OPpDEREF_HV:
b162af07 2939 SvRV_set(sv, (SV*)newHV());
5f05dabc
PP
2940 break;
2941 }
02a9e968
CS
2942 SvROK_on(sv);
2943 SvSETMAGIC(sv);
2944 }
2945}
2946
a0d0e21e
LW
2947PP(pp_method)
2948{
39644a26 2949 dSP;
f5d5a27c
CS
2950 SV* sv = TOPs;
2951
2952 if (SvROK(sv)) {
eda383f2 2953 SV* rsv = SvRV(sv);
f5d5a27c
CS
2954 if (SvTYPE(rsv) == SVt_PVCV) {
2955 SETs(rsv);
2956 RETURN;
2957 }
2958 }
2959
2960 SETs(method_common(sv, Null(U32*)));
2961 RETURN;
2962}
2963
2964PP(pp_method_named)
2965{
39644a26 2966 dSP;
3848b962 2967 SV* sv = cSVOP_sv;
f5d5a27c
CS
2968 U32 hash = SvUVX(sv);
2969
2970 XPUSHs(method_common(sv, &hash));
2971 RETURN;
2972}
2973
2974STATIC SV *
2975S_method_common(pTHX_ SV* meth, U32* hashp)
2976{
a0d0e21e
LW
2977 SV* sv;
2978 SV* ob;
2979 GV* gv;
56304f61 2980 HV* stash;
f5d5a27c 2981 STRLEN namelen;
a9c4fd4e 2982 const char* packname = 0;
0dae17bd 2983 SV *packsv = Nullsv;
ac91690f 2984 STRLEN packlen;
a9c4fd4e 2985 const char *name = SvPV(meth, namelen);
a0d0e21e 2986
3280af22 2987 sv = *(PL_stack_base + TOPMARK + 1);
f5d5a27c 2988
4f1b7578
SC
2989 if (!sv)
2990 Perl_croak(aTHX_ "Can't call method \"%s\" on an undefined value", name);
2991
16d20bd9 2992 if (SvGMAGICAL(sv))
af09ea45 2993 mg_get(sv);
a0d0e21e 2994 if (SvROK(sv))
16d20bd9 2995 ob = (SV*)SvRV(sv);
a0d0e21e
LW
2996 else {
2997 GV* iogv;
a0d0e21e 2998
af09ea45 2999 /* this isn't a reference */
56304f61 3000 packname = Nullch;
081fc587
AB
3001
3002 if(SvOK(sv) && (packname = SvPV(sv, packlen))) {
7e8961ec
AB
3003 HE* he;
3004 he = hv_fetch_ent(PL_stashcache, sv, 0, 0);
081fc587 3005 if (he) {
5e6396ae 3006 stash = INT2PTR(HV*,SvIV(HeVAL(he)));
081fc587
AB
3007 goto fetch;
3008 }
3009 }
3010
a0d0e21e 3011 if (!SvOK(sv) ||
05f5af9a 3012 !(packname) ||
7a5fd60d 3013 !(iogv = gv_fetchsv(sv, FALSE, SVt_PVIO)) ||
a0d0e21e
LW
3014 !(ob=(SV*)GvIO(iogv)))
3015 {
af09ea45 3016 /* this isn't the name of a filehandle either */
1c846c1f 3017 if (!packname ||
fd400ab9 3018 ((UTF8_IS_START(*packname) && DO_UTF8(sv))
b86a2fa7 3019 ? !isIDFIRST_utf8((U8*)packname)
834a4ddd
LW
3020 : !isIDFIRST(*packname)
3021 ))
3022 {
f5d5a27c
CS
3023 Perl_croak(aTHX_ "Can't call method \"%s\" %s", name,
3024 SvOK(sv) ? "without a package or object reference"
3025 : "on an undefined value");
834a4ddd 3026 }
af09ea45
IK
3027 /* assume it's a package name */
3028 stash = gv_stashpvn(packname, packlen, FALSE);
0dae17bd
GS
3029 if (!stash)
3030 packsv = sv;
081fc587 3031 else {
5e6396ae 3032 SV* ref = newSViv(PTR2IV(stash));
7e8961ec
AB
3033 hv_store(PL_stashcache, packname, packlen, ref, 0);
3034 }
ac91690f 3035 goto fetch;
a0d0e21e 3036 }
af09ea45 3037 /* it _is_ a filehandle name -- replace with a reference */
3280af22 3038 *(PL_stack_base + TOPMARK + 1) = sv_2mortal(newRV((SV*)iogv));
a0d0e21e
LW
3039 }
3040
af09ea45 3041 /* if we got here, ob should be a reference or a glob */
f0d43078
GS
3042 if (!ob || !(SvOBJECT(ob)
3043 || (SvTYPE(ob) == SVt_PVGV && (ob = (SV*)GvIO((GV*)ob))
3044 && SvOBJECT(ob))))
3045 {
f5d5a27c
CS
3046 Perl_croak(aTHX_ "Can't call method \"%s\" on unblessed reference",
3047 name);
f0d43078 3048 }
a0d0e21e 3049
56304f61 3050 stash = SvSTASH(ob);
a0d0e21e 3051
ac91690f 3052 fetch:
af09ea45
IK
3053 /* NOTE: stash may be null, hope hv_fetch_ent and
3054 gv_fetchmethod can cope (it seems they can) */
3055
f5d5a27c
CS
3056 /* shortcut for simple names */
3057 if (hashp) {
3058 HE* he = hv_fetch_ent(stash, meth, 0, *hashp);
3059 if (he) {
3060 gv = (GV*)HeVAL(he);
3061 if (isGV(gv) && GvCV(gv) &&
3062 (!GvCVGEN(gv) || GvCVGEN(gv) == PL_sub_generation))
3063 return (SV*)GvCV(gv);
3064 }
3065 }
3066
0dae17bd 3067 gv = gv_fetchmethod(stash ? stash : (HV*)packsv, name);
af09ea45 3068
56304f61 3069 if (!gv) {
af09ea45
IK
3070 /* This code tries to figure out just what went wrong with
3071 gv_fetchmethod. It therefore needs to duplicate a lot of
3072 the internals of that function. We can't move it inside
3073 Perl_gv_fetchmethod_autoload(), however, since that would
3074 cause UNIVERSAL->can("NoSuchPackage::foo") to croak, and we
3075 don't want that.
3076 */
a9c4fd4e
AL
3077 const char* leaf = name;
3078 const char* sep = Nullch;
3079 const char* p;
56304f61
CS
3080
3081 for (p = name; *p; p++) {
3082 if (*p == '\'')
3083 sep = p, leaf = p + 1;
3084 else if (*p == ':' && *(p + 1) == ':')
3085 sep = p, leaf = p + 2;
3086 }
3087 if (!sep || ((sep - name) == 5 && strnEQ(name, "SUPER", 5))) {
af09ea45
IK
3088 /* the method name is unqualified or starts with SUPER:: */
3089 packname = sep ? CopSTASHPV(PL_curcop) :
bfcb3514 3090 stash ? HvNAME_get(stash) : packname;
e27ad1f2
AV
3091 if (!packname)
3092 Perl_croak(aTHX_
3093 "Can't use anonymous symbol table for method lookup");
3094 else
3095 packlen = strlen(packname);
56304f61
CS
3096 }
3097 else {
af09ea45 3098 /* the method name is qualified */
56304f61
CS
3099 packname = name;
3100 packlen = sep - name;
3101 }
af09ea45
IK
3102
3103 /* we're relying on gv_fetchmethod not autovivifying the stash */
3104 if (gv_stashpvn(packname, packlen, FALSE)) {
c1899e02 3105 Perl_croak(aTHX_
af09ea45
IK
3106 "Can't locate object method \"%s\" via package \"%.*s\"",
3107 leaf, (int)packlen, packname);
c1899e02
GS
3108 }
3109 else {
3110 Perl_croak(aTHX_
af09ea45
IK
3111 "Can't locate object method \"%s\" via package \"%.*s\""
3112 " (perhaps you forgot to load \"%.*s\"?)",
3113 leaf, (int)packlen, packname, (int)packlen, packname);
c1899e02 3114 }
56304f61 3115 }
f5d5a27c 3116 return isGV(gv) ? (SV*)GvCV(gv) : (SV*)gv;
a0d0e21e 3117}
241d1a3b
NC
3118
3119/*
3120 * Local variables:
3121 * c-indentation-style: bsd
3122 * c-basic-offset: 4
3123 * indent-tabs-mode: t
3124 * End:
3125 *
37442d52
RGS
3126 * ex: set ts=8 sts=4 sw=4 noet:
3127 */