This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
Re: [PATCH] xsubpp prototypes warnings
[perl5.git] / pp_hot.c
CommitLineData
a0d0e21e
LW
1/* pp_hot.c
2 *
be3c0a43 3 * Copyright (c) 1991-2002, Larry Wall
a0d0e21e
LW
4 *
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
7 *
8 */
9
10/*
11 * Then he heard Merry change the note, and up went the Horn-cry of Buckland,
12 * shaking the air.
13 *
14 * Awake! Awake! Fear, Fire, Foes! Awake!
15 * Fire, Foes! Awake!
16 */
17
18#include "EXTERN.h"
864dbfa3 19#define PERL_IN_PP_HOT_C
a0d0e21e
LW
20#include "perl.h"
21
22/* Hot code. */
23
4d1ff10f 24#ifdef USE_5005THREADS
acfe0abc 25static void unset_cvowner(pTHX_ void *cvarg);
4d1ff10f 26#endif /* USE_5005THREADS */
11343788 27
a0d0e21e
LW
28PP(pp_const)
29{
39644a26 30 dSP;
1d7c1841 31 XPUSHs(cSVOP_sv);
a0d0e21e
LW
32 RETURN;
33}
34
35PP(pp_nextstate)
36{
533c011a 37 PL_curcop = (COP*)PL_op;
a0d0e21e 38 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 39 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e
LW
40 FREETMPS;
41 return NORMAL;
42}
43
44PP(pp_gvsv)
45{
39644a26 46 dSP;
924508f0 47 EXTEND(SP,1);
533c011a 48 if (PL_op->op_private & OPpLVAL_INTRO)
1d7c1841 49 PUSHs(save_scalar(cGVOP_gv));
a0d0e21e 50 else
1d7c1841 51 PUSHs(GvSV(cGVOP_gv));
a0d0e21e
LW
52 RETURN;
53}
54
55PP(pp_null)
56{
57 return NORMAL;
58}
59
7399586d
HS
60PP(pp_setstate)
61{
62 PL_curcop = (COP*)PL_op;
63 return NORMAL;
64}
65
a0d0e21e
LW
66PP(pp_pushmark)
67{
3280af22 68 PUSHMARK(PL_stack_sp);
a0d0e21e
LW
69 return NORMAL;
70}
71
72PP(pp_stringify)
73{
39644a26 74 dSP; dTARGET;
6050d10e 75 sv_copypv(TARG,TOPs);
a0d0e21e
LW
76 SETTARG;
77 RETURN;
78}
79
80PP(pp_gv)
81{
39644a26 82 dSP;
1d7c1841 83 XPUSHs((SV*)cGVOP_gv);
a0d0e21e
LW
84 RETURN;
85}
86
87PP(pp_and)
88{
39644a26 89 dSP;
a0d0e21e
LW
90 if (!SvTRUE(TOPs))
91 RETURN;
92 else {
93 --SP;
94 RETURNOP(cLOGOP->op_other);
95 }
96}
97
98PP(pp_sassign)
99{
39644a26 100 dSP; dPOPTOPssrl;
748a9306 101
533c011a 102 if (PL_op->op_private & OPpASSIGN_BACKWARDS) {
a0d0e21e
LW
103 SV *temp;
104 temp = left; left = right; right = temp;
105 }
3280af22 106 if (PL_tainting && PL_tainted && !SvTAINTED(left))
a0d0e21e 107 TAINT_NOT;
54310121 108 SvSetMagicSV(right, left);
a0d0e21e
LW
109 SETs(right);
110 RETURN;
111}
112
113PP(pp_cond_expr)
114{
39644a26 115 dSP;
a0d0e21e 116 if (SvTRUEx(POPs))
1a67a97c 117 RETURNOP(cLOGOP->op_other);
a0d0e21e 118 else
1a67a97c 119 RETURNOP(cLOGOP->op_next);
a0d0e21e
LW
120}
121
122PP(pp_unstack)
123{
124 I32 oldsave;
125 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 126 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e 127 FREETMPS;
3280af22 128 oldsave = PL_scopestack[PL_scopestack_ix - 1];
a0d0e21e
LW
129 LEAVE_SCOPE(oldsave);
130 return NORMAL;
131}
132
a0d0e21e
LW
133PP(pp_concat)
134{
39644a26 135 dSP; dATARGET; tryAMAGICbin(concat,opASSIGN);
748a9306
LW
136 {
137 dPOPTOPssrl;
8d6d96c1
HS
138 STRLEN llen;
139 char* lpv;
140 bool lbyte;
141 STRLEN rlen;
142 char* rpv = SvPV(right, rlen); /* mg_get(right) happens here */
143 bool rbyte = !SvUTF8(right);
144
145 if (TARG == right && right != left) {
146 right = sv_2mortal(newSVpvn(rpv, rlen));
147 rpv = SvPV(right, rlen); /* no point setting UTF8 here */
148 }
7889fe52 149
8d6d96c1
HS
150 if (TARG != left) {
151 lpv = SvPV(left, llen); /* mg_get(left) may happen here */
152 lbyte = !SvUTF8(left);
153 sv_setpvn(TARG, lpv, llen);
154 if (!lbyte)
155 SvUTF8_on(TARG);
156 else
157 SvUTF8_off(TARG);
158 }
159 else { /* TARG == left */
160 if (SvGMAGICAL(left))
161 mg_get(left); /* or mg_get(left) may happen here */
162 if (!SvOK(TARG))
163 sv_setpv(left, "");
164 lpv = SvPV_nomg(left, llen);
165 lbyte = !SvUTF8(left);
166 }
a12c0f56 167
fd15e783
PN
168#if defined(PERL_Y2KWARN)
169 if ((SvIOK(right) || SvNOK(right)) && ckWARN(WARN_Y2K) && SvOK(TARG)) {
8d6d96c1
HS
170 if (llen >= 2 && lpv[llen - 2] == '1' && lpv[llen - 1] == '9'
171 && (llen == 2 || !isDIGIT(lpv[llen - 3])))
172 {
173 Perl_warner(aTHX_ WARN_Y2K, "Possible Y2K bug: %s",
174 "about to append an integer to '19'");
175 }
fd15e783
PN
176 }
177#endif
178
8d6d96c1
HS
179 if (lbyte != rbyte) {
180 if (lbyte)
181 sv_utf8_upgrade_nomg(TARG);
182 else {
183 sv_utf8_upgrade_nomg(right);
184 rpv = SvPV(right, rlen);
69b47968 185 }
a0d0e21e 186 }
8d6d96c1 187 sv_catpvn_nomg(TARG, rpv, rlen);
43ebc500 188
a0d0e21e
LW
189 SETTARG;
190 RETURN;
748a9306 191 }
a0d0e21e
LW
192}
193
194PP(pp_padsv)
195{
39644a26 196 dSP; dTARGET;
a0d0e21e 197 XPUSHs(TARG);
533c011a
NIS
198 if (PL_op->op_flags & OPf_MOD) {
199 if (PL_op->op_private & OPpLVAL_INTRO)
200 SAVECLEARSV(PL_curpad[PL_op->op_targ]);
201 else if (PL_op->op_private & OPpDEREF) {
8ec5e241 202 PUTBACK;
533c011a 203 vivify_ref(PL_curpad[PL_op->op_targ], PL_op->op_private & OPpDEREF);
8ec5e241
NIS
204 SPAGAIN;
205 }
4633a7c4 206 }
a0d0e21e
LW
207 RETURN;
208}
209
210PP(pp_readline)
211{
f5284f61 212 tryAMAGICunTARGET(iter, 0);
3280af22 213 PL_last_in_gv = (GV*)(*PL_stack_sp--);
8efb3254 214 if (SvTYPE(PL_last_in_gv) != SVt_PVGV) {
1c846c1f 215 if (SvROK(PL_last_in_gv) && SvTYPE(SvRV(PL_last_in_gv)) == SVt_PVGV)
f5284f61 216 PL_last_in_gv = (GV*)SvRV(PL_last_in_gv);
8efb3254 217 else {
f5284f61
IZ
218 dSP;
219 XPUSHs((SV*)PL_last_in_gv);
220 PUTBACK;
cea2e8a9 221 pp_rv2gv();
f5284f61 222 PL_last_in_gv = (GV*)(*PL_stack_sp--);
f5284f61
IZ
223 }
224 }
a0d0e21e
LW
225 return do_readline();
226}
227
228PP(pp_eq)
229{
39644a26 230 dSP; tryAMAGICbinSET(eq,0);
4c9fe80f
AS
231#ifndef NV_PRESERVES_UV
232 if (SvROK(TOPs) && SvROK(TOPm1s)) {
e61d22ef
NC
233 SP--;
234 SETs(boolSV(SvRV(TOPs) == SvRV(TOPp1s)));
4c9fe80f
AS
235 RETURN;
236 }
237#endif
28e5dec8
JH
238#ifdef PERL_PRESERVE_IVUV
239 SvIV_please(TOPs);
240 if (SvIOK(TOPs)) {
4c9fe80f
AS
241 /* Unless the left argument is integer in range we are going
242 to have to use NV maths. Hence only attempt to coerce the
243 right argument if we know the left is integer. */
28e5dec8
JH
244 SvIV_please(TOPm1s);
245 if (SvIOK(TOPm1s)) {
246 bool auvok = SvUOK(TOPm1s);
247 bool buvok = SvUOK(TOPs);
a12c0f56 248
1605159e
NC
249 if (auvok == buvok) { /* ## IV == IV or UV == UV ## */
250 /* Casting IV to UV before comparison isn't going to matter
251 on 2s complement. On 1s complement or sign&magnitude
252 (if we have any of them) it could to make negative zero
253 differ from normal zero. As I understand it. (Need to
254 check - is negative zero implementation defined behaviour
255 anyway?). NWC */
256 UV buv = SvUVX(POPs);
257 UV auv = SvUVX(TOPs);
28e5dec8 258
28e5dec8
JH
259 SETs(boolSV(auv == buv));
260 RETURN;
261 }
262 { /* ## Mixed IV,UV ## */
1605159e 263 SV *ivp, *uvp;
28e5dec8 264 IV iv;
28e5dec8 265
1605159e 266 /* == is commutative so doesn't matter which is left or right */
28e5dec8 267 if (auvok) {
1605159e
NC
268 /* top of stack (b) is the iv */
269 ivp = *SP;
270 uvp = *--SP;
271 } else {
272 uvp = *SP;
273 ivp = *--SP;
274 }
275 iv = SvIVX(ivp);
276 if (iv < 0) {
277 /* As uv is a UV, it's >0, so it cannot be == */
278 SETs(&PL_sv_no);
279 RETURN;
280 }
28e5dec8 281 /* we know iv is >= 0 */
1605159e 282 SETs(boolSV((UV)iv == SvUVX(uvp)));
28e5dec8
JH
283 RETURN;
284 }
285 }
286 }
287#endif
a0d0e21e
LW
288 {
289 dPOPnv;
54310121 290 SETs(boolSV(TOPn == value));
a0d0e21e
LW
291 RETURN;
292 }
293}
294
295PP(pp_preinc)
296{
39644a26 297 dSP;
3510b4a1 298 if (SvTYPE(TOPs) > SVt_PVLV)
d470f89e 299 DIE(aTHX_ PL_no_modify);
3510b4a1
NC
300 if (!SvREADONLY(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
301 && SvIVX(TOPs) != IV_MAX)
55497cff 302 {
748a9306 303 ++SvIVX(TOPs);
55497cff 304 SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
748a9306 305 }
28e5dec8 306 else /* Do all the PERL_PRESERVE_IVUV conditionals in sv_inc */
748a9306 307 sv_inc(TOPs);
a0d0e21e
LW
308 SvSETMAGIC(TOPs);
309 return NORMAL;
310}
311
312PP(pp_or)
313{
39644a26 314 dSP;
a0d0e21e
LW
315 if (SvTRUE(TOPs))
316 RETURN;
317 else {
318 --SP;
319 RETURNOP(cLOGOP->op_other);
320 }
321}
322
323PP(pp_add)
324{
39644a26 325 dSP; dATARGET; bool useleft; tryAMAGICbin(add,opASSIGN);
28e5dec8
JH
326 useleft = USE_LEFT(TOPm1s);
327#ifdef PERL_PRESERVE_IVUV
328 /* We must see if we can perform the addition with integers if possible,
329 as the integer code detects overflow while the NV code doesn't.
330 If either argument hasn't had a numeric conversion yet attempt to get
331 the IV. It's important to do this now, rather than just assuming that
332 it's not IOK as a PV of "9223372036854775806" may not take well to NV
333 addition, and an SV which is NOK, NV=6.0 ought to be coerced to
334 integer in case the second argument is IV=9223372036854775806
335 We can (now) rely on sv_2iv to do the right thing, only setting the
336 public IOK flag if the value in the NV (or PV) slot is truly integer.
337
338 A side effect is that this also aggressively prefers integer maths over
7dca457a
NC
339 fp maths for integer values.
340
a00b5bd3 341 How to detect overflow?
7dca457a
NC
342
343 C 99 section 6.2.6.1 says
344
345 The range of nonnegative values of a signed integer type is a subrange
346 of the corresponding unsigned integer type, and the representation of
347 the same value in each type is the same. A computation involving
348 unsigned operands can never overflow, because a result that cannot be
349 represented by the resulting unsigned integer type is reduced modulo
350 the number that is one greater than the largest value that can be
351 represented by the resulting type.
352
353 (the 9th paragraph)
354
355 which I read as "unsigned ints wrap."
356
357 signed integer overflow seems to be classed as "exception condition"
358
359 If an exceptional condition occurs during the evaluation of an
360 expression (that is, if the result is not mathematically defined or not
361 in the range of representable values for its type), the behavior is
362 undefined.
363
364 (6.5, the 5th paragraph)
365
366 I had assumed that on 2s complement machines signed arithmetic would
367 wrap, hence coded pp_add and pp_subtract on the assumption that
368 everything perl builds on would be happy. After much wailing and
369 gnashing of teeth it would seem that irix64 knows its ANSI spec well,
370 knows that it doesn't need to, and doesn't. Bah. Anyway, the all-
371 unsigned code below is actually shorter than the old code. :-)
372 */
373
28e5dec8
JH
374 SvIV_please(TOPs);
375 if (SvIOK(TOPs)) {
376 /* Unless the left argument is integer in range we are going to have to
377 use NV maths. Hence only attempt to coerce the right argument if
378 we know the left is integer. */
9c5ffd7c
JH
379 register UV auv = 0;
380 bool auvok = FALSE;
7dca457a
NC
381 bool a_valid = 0;
382
28e5dec8 383 if (!useleft) {
7dca457a
NC
384 auv = 0;
385 a_valid = auvok = 1;
386 /* left operand is undef, treat as zero. + 0 is identity,
387 Could SETi or SETu right now, but space optimise by not adding
388 lots of code to speed up what is probably a rarish case. */
389 } else {
390 /* Left operand is defined, so is it IV? */
391 SvIV_please(TOPm1s);
392 if (SvIOK(TOPm1s)) {
393 if ((auvok = SvUOK(TOPm1s)))
394 auv = SvUVX(TOPm1s);
395 else {
396 register IV aiv = SvIVX(TOPm1s);
397 if (aiv >= 0) {
398 auv = aiv;
399 auvok = 1; /* Now acting as a sign flag. */
400 } else { /* 2s complement assumption for IV_MIN */
401 auv = (UV)-aiv;
402 }
403 }
404 a_valid = 1;
28e5dec8
JH
405 }
406 }
7dca457a
NC
407 if (a_valid) {
408 bool result_good = 0;
409 UV result;
410 register UV buv;
28e5dec8 411 bool buvok = SvUOK(TOPs);
a00b5bd3 412
7dca457a
NC
413 if (buvok)
414 buv = SvUVX(TOPs);
415 else {
416 register IV biv = SvIVX(TOPs);
417 if (biv >= 0) {
418 buv = biv;
419 buvok = 1;
420 } else
421 buv = (UV)-biv;
422 }
423 /* ?uvok if value is >= 0. basically, flagged as UV if it's +ve,
602f51c4 424 else "IV" now, independent of how it came in.
7dca457a
NC
425 if a, b represents positive, A, B negative, a maps to -A etc
426 a + b => (a + b)
427 A + b => -(a - b)
428 a + B => (a - b)
429 A + B => -(a + b)
430 all UV maths. negate result if A negative.
431 add if signs same, subtract if signs differ. */
432
433 if (auvok ^ buvok) {
434 /* Signs differ. */
435 if (auv >= buv) {
436 result = auv - buv;
437 /* Must get smaller */
438 if (result <= auv)
439 result_good = 1;
440 } else {
441 result = buv - auv;
442 if (result <= buv) {
443 /* result really should be -(auv-buv). as its negation
444 of true value, need to swap our result flag */
445 auvok = !auvok;
446 result_good = 1;
28e5dec8
JH
447 }
448 }
7dca457a
NC
449 } else {
450 /* Signs same */
451 result = auv + buv;
452 if (result >= auv)
453 result_good = 1;
454 }
455 if (result_good) {
456 SP--;
457 if (auvok)
28e5dec8 458 SETu( result );
7dca457a
NC
459 else {
460 /* Negate result */
461 if (result <= (UV)IV_MIN)
462 SETi( -(IV)result );
463 else {
464 /* result valid, but out of range for IV. */
465 SETn( -(NV)result );
28e5dec8
JH
466 }
467 }
7dca457a
NC
468 RETURN;
469 } /* Overflow, drop through to NVs. */
28e5dec8
JH
470 }
471 }
472#endif
a0d0e21e 473 {
28e5dec8
JH
474 dPOPnv;
475 if (!useleft) {
476 /* left operand is undef, treat as zero. + 0.0 is identity. */
477 SETn(value);
478 RETURN;
479 }
480 SETn( value + TOPn );
481 RETURN;
a0d0e21e
LW
482 }
483}
484
485PP(pp_aelemfast)
486{
39644a26 487 dSP;
1d7c1841 488 AV *av = GvAV(cGVOP_gv);
533c011a
NIS
489 U32 lval = PL_op->op_flags & OPf_MOD;
490 SV** svp = av_fetch(av, PL_op->op_private, lval);
3280af22 491 SV *sv = (svp ? *svp : &PL_sv_undef);
6ff81951 492 EXTEND(SP, 1);
be6c24e0
GS
493 if (!lval && SvGMAGICAL(sv)) /* see note in pp_helem() */
494 sv = sv_mortalcopy(sv);
495 PUSHs(sv);
a0d0e21e
LW
496 RETURN;
497}
498
499PP(pp_join)
500{
39644a26 501 dSP; dMARK; dTARGET;
a0d0e21e
LW
502 MARK++;
503 do_join(TARG, *MARK, MARK, SP);
504 SP = MARK;
505 SETs(TARG);
506 RETURN;
507}
508
509PP(pp_pushre)
510{
39644a26 511 dSP;
44a8e56a
PP
512#ifdef DEBUGGING
513 /*
514 * We ass_u_me that LvTARGOFF() comes first, and that two STRLENs
515 * will be enough to hold an OP*.
516 */
517 SV* sv = sv_newmortal();
518 sv_upgrade(sv, SVt_PVLV);
519 LvTYPE(sv) = '/';
533c011a 520 Copy(&PL_op, &LvTARGOFF(sv), 1, OP*);
44a8e56a
PP
521 XPUSHs(sv);
522#else
6b88bc9c 523 XPUSHs((SV*)PL_op);
44a8e56a 524#endif
a0d0e21e
LW
525 RETURN;
526}
527
528/* Oversized hot code. */
529
530PP(pp_print)
531{
39644a26 532 dSP; dMARK; dORIGMARK;
a0d0e21e
LW
533 GV *gv;
534 IO *io;
760ac839 535 register PerlIO *fp;
236988e4 536 MAGIC *mg;
a0d0e21e 537
533c011a 538 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e
LW
539 gv = (GV*)*++MARK;
540 else
3280af22 541 gv = PL_defoutgv;
5b468f54
AMS
542
543 if (gv && (io = GvIO(gv))
544 && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar)))
545 {
01bb7c6d 546 had_magic:
68dc0745 547 if (MARK == ORIGMARK) {
1c846c1f 548 /* If using default handle then we need to make space to
a60c0954
NIS
549 * pass object as 1st arg, so move other args up ...
550 */
4352c267 551 MEXTEND(SP, 1);
68dc0745
PP
552 ++MARK;
553 Move(MARK, MARK + 1, (SP - MARK) + 1, SV*);
554 ++SP;
555 }
556 PUSHMARK(MARK - 1);
5b468f54 557 *MARK = SvTIED_obj((SV*)io, mg);
68dc0745 558 PUTBACK;
236988e4 559 ENTER;
864dbfa3 560 call_method("PRINT", G_SCALAR);
236988e4
PP
561 LEAVE;
562 SPAGAIN;
68dc0745
PP
563 MARK = ORIGMARK + 1;
564 *MARK = *SP;
565 SP = MARK;
236988e4
PP
566 RETURN;
567 }
a0d0e21e 568 if (!(io = GvIO(gv))) {
5b468f54
AMS
569 if ((GvEGV(gv)) && (io = GvIO(GvEGV(gv)))
570 && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar)))
01bb7c6d 571 goto had_magic;
2dd78f96
JH
572 if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
573 report_evil_fh(gv, io, PL_op->op_type);
91487cfc 574 SETERRNO(EBADF,RMS$_IFI);
a0d0e21e
LW
575 goto just_say_no;
576 }
577 else if (!(fp = IoOFP(io))) {
599cee73 578 if (ckWARN2(WARN_CLOSED, WARN_IO)) {
4c80c0b2
NC
579 if (IoIFP(io))
580 report_evil_fh(gv, io, OP_phoney_INPUT_ONLY);
2dd78f96 581 else if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
bc37a18f 582 report_evil_fh(gv, io, PL_op->op_type);
a0d0e21e 583 }
91487cfc 584 SETERRNO(EBADF,IoIFP(io)?RMS$_FAC:RMS$_IFI);
a0d0e21e
LW
585 goto just_say_no;
586 }
587 else {
588 MARK++;
7889fe52 589 if (PL_ofs_sv && SvOK(PL_ofs_sv)) {
a0d0e21e
LW
590 while (MARK <= SP) {
591 if (!do_print(*MARK, fp))
592 break;
593 MARK++;
594 if (MARK <= SP) {
7889fe52 595 if (!do_print(PL_ofs_sv, fp)) { /* $, */
a0d0e21e
LW
596 MARK--;
597 break;
598 }
599 }
600 }
601 }
602 else {
603 while (MARK <= SP) {
604 if (!do_print(*MARK, fp))
605 break;
606 MARK++;
607 }
608 }
609 if (MARK <= SP)
610 goto just_say_no;
611 else {
7889fe52
NIS
612 if (PL_ors_sv && SvOK(PL_ors_sv))
613 if (!do_print(PL_ors_sv, fp)) /* $\ */
a0d0e21e
LW
614 goto just_say_no;
615
616 if (IoFLAGS(io) & IOf_FLUSH)
760ac839 617 if (PerlIO_flush(fp) == EOF)
a0d0e21e
LW
618 goto just_say_no;
619 }
620 }
621 SP = ORIGMARK;
3280af22 622 PUSHs(&PL_sv_yes);
a0d0e21e
LW
623 RETURN;
624
625 just_say_no:
626 SP = ORIGMARK;
3280af22 627 PUSHs(&PL_sv_undef);
a0d0e21e
LW
628 RETURN;
629}
630
631PP(pp_rv2av)
632{
39644a26 633 dSP; dTOPss;
a0d0e21e
LW
634 AV *av;
635
636 if (SvROK(sv)) {
637 wasref:
f5284f61
IZ
638 tryAMAGICunDEREF(to_av);
639
a0d0e21e
LW
640 av = (AV*)SvRV(sv);
641 if (SvTYPE(av) != SVt_PVAV)
cea2e8a9 642 DIE(aTHX_ "Not an ARRAY reference");
533c011a 643 if (PL_op->op_flags & OPf_REF) {
f5284f61 644 SETs((SV*)av);
a0d0e21e
LW
645 RETURN;
646 }
78f9721b
SM
647 else if (LVRET) {
648 if (GIMME == G_SCALAR)
649 Perl_croak(aTHX_ "Can't return array to lvalue scalar context");
650 SETs((SV*)av);
651 RETURN;
652 }
a0d0e21e
LW
653 }
654 else {
655 if (SvTYPE(sv) == SVt_PVAV) {
656 av = (AV*)sv;
533c011a 657 if (PL_op->op_flags & OPf_REF) {
f5284f61 658 SETs((SV*)av);
a0d0e21e
LW
659 RETURN;
660 }
78f9721b
SM
661 else if (LVRET) {
662 if (GIMME == G_SCALAR)
663 Perl_croak(aTHX_ "Can't return array to lvalue"
664 " scalar context");
665 SETs((SV*)av);
666 RETURN;
667 }
a0d0e21e
LW
668 }
669 else {
67955e0c 670 GV *gv;
1c846c1f 671
a0d0e21e 672 if (SvTYPE(sv) != SVt_PVGV) {
748a9306 673 char *sym;
c9d5ac95 674 STRLEN len;
748a9306 675
a0d0e21e
LW
676 if (SvGMAGICAL(sv)) {
677 mg_get(sv);
678 if (SvROK(sv))
679 goto wasref;
680 }
681 if (!SvOK(sv)) {
533c011a
NIS
682 if (PL_op->op_flags & OPf_REF ||
683 PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 684 DIE(aTHX_ PL_no_usym, "an ARRAY");
599cee73 685 if (ckWARN(WARN_UNINITIALIZED))
1d7c1841 686 report_uninit();
f5284f61 687 if (GIMME == G_ARRAY) {
c2444246 688 (void)POPs;
4633a7c4 689 RETURN;
f5284f61
IZ
690 }
691 RETSETUNDEF;
a0d0e21e 692 }
c9d5ac95 693 sym = SvPV(sv,len);
35cd451c
GS
694 if ((PL_op->op_flags & OPf_SPECIAL) &&
695 !(PL_op->op_flags & OPf_MOD))
696 {
697 gv = (GV*)gv_fetchpv(sym, FALSE, SVt_PVAV);
c9d5ac95
GS
698 if (!gv
699 && (!is_gv_magical(sym,len,0)
700 || !(gv = (GV*)gv_fetchpv(sym, TRUE, SVt_PVAV))))
701 {
35cd451c 702 RETSETUNDEF;
c9d5ac95 703 }
35cd451c
GS
704 }
705 else {
706 if (PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 707 DIE(aTHX_ PL_no_symref, sym, "an ARRAY");
35cd451c
GS
708 gv = (GV*)gv_fetchpv(sym, TRUE, SVt_PVAV);
709 }
710 }
711 else {
67955e0c 712 gv = (GV*)sv;
a0d0e21e 713 }
67955e0c 714 av = GvAVn(gv);
533c011a 715 if (PL_op->op_private & OPpLVAL_INTRO)
67955e0c 716 av = save_ary(gv);
533c011a 717 if (PL_op->op_flags & OPf_REF) {
f5284f61 718 SETs((SV*)av);
a0d0e21e
LW
719 RETURN;
720 }
78f9721b
SM
721 else if (LVRET) {
722 if (GIMME == G_SCALAR)
723 Perl_croak(aTHX_ "Can't return array to lvalue"
724 " scalar context");
725 SETs((SV*)av);
726 RETURN;
727 }
a0d0e21e
LW
728 }
729 }
730
731 if (GIMME == G_ARRAY) {
732 I32 maxarg = AvFILL(av) + 1;
c2444246 733 (void)POPs; /* XXXX May be optimized away? */
1c846c1f 734 EXTEND(SP, maxarg);
93965878 735 if (SvRMAGICAL(av)) {
1c846c1f 736 U32 i;
93965878
NIS
737 for (i=0; i < maxarg; i++) {
738 SV **svp = av_fetch(av, i, FALSE);
3280af22 739 SP[i+1] = (svp) ? *svp : &PL_sv_undef;
93965878 740 }
1c846c1f 741 }
93965878
NIS
742 else {
743 Copy(AvARRAY(av), SP+1, maxarg, SV*);
744 }
a0d0e21e
LW
745 SP += maxarg;
746 }
747 else {
748 dTARGET;
749 I32 maxarg = AvFILL(av) + 1;
f5284f61 750 SETi(maxarg);
a0d0e21e
LW
751 }
752 RETURN;
753}
754
755PP(pp_rv2hv)
756{
39644a26 757 dSP; dTOPss;
a0d0e21e
LW
758 HV *hv;
759
760 if (SvROK(sv)) {
761 wasref:
f5284f61
IZ
762 tryAMAGICunDEREF(to_hv);
763
a0d0e21e 764 hv = (HV*)SvRV(sv);
c750a3ec 765 if (SvTYPE(hv) != SVt_PVHV && SvTYPE(hv) != SVt_PVAV)
cea2e8a9 766 DIE(aTHX_ "Not a HASH reference");
533c011a 767 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
768 SETs((SV*)hv);
769 RETURN;
770 }
78f9721b
SM
771 else if (LVRET) {
772 if (GIMME == G_SCALAR)
773 Perl_croak(aTHX_ "Can't return hash to lvalue scalar context");
774 SETs((SV*)hv);
775 RETURN;
776 }
a0d0e21e
LW
777 }
778 else {
c750a3ec 779 if (SvTYPE(sv) == SVt_PVHV || SvTYPE(sv) == SVt_PVAV) {
a0d0e21e 780 hv = (HV*)sv;
533c011a 781 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
782 SETs((SV*)hv);
783 RETURN;
784 }
78f9721b
SM
785 else if (LVRET) {
786 if (GIMME == G_SCALAR)
787 Perl_croak(aTHX_ "Can't return hash to lvalue"
788 " scalar context");
789 SETs((SV*)hv);
790 RETURN;
791 }
a0d0e21e
LW
792 }
793 else {
67955e0c 794 GV *gv;
1c846c1f 795
a0d0e21e 796 if (SvTYPE(sv) != SVt_PVGV) {
748a9306 797 char *sym;
c9d5ac95 798 STRLEN len;
748a9306 799
a0d0e21e
LW
800 if (SvGMAGICAL(sv)) {
801 mg_get(sv);
802 if (SvROK(sv))
803 goto wasref;
804 }
805 if (!SvOK(sv)) {
533c011a
NIS
806 if (PL_op->op_flags & OPf_REF ||
807 PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 808 DIE(aTHX_ PL_no_usym, "a HASH");
599cee73 809 if (ckWARN(WARN_UNINITIALIZED))
1d7c1841 810 report_uninit();
4633a7c4
LW
811 if (GIMME == G_ARRAY) {
812 SP--;
813 RETURN;
814 }
a0d0e21e
LW
815 RETSETUNDEF;
816 }
c9d5ac95 817 sym = SvPV(sv,len);
35cd451c
GS
818 if ((PL_op->op_flags & OPf_SPECIAL) &&
819 !(PL_op->op_flags & OPf_MOD))
820 {
821 gv = (GV*)gv_fetchpv(sym, FALSE, SVt_PVHV);
c9d5ac95
GS
822 if (!gv
823 && (!is_gv_magical(sym,len,0)
824 || !(gv = (GV*)gv_fetchpv(sym, TRUE, SVt_PVHV))))
825 {
35cd451c 826 RETSETUNDEF;
c9d5ac95 827 }
35cd451c
GS
828 }
829 else {
830 if (PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 831 DIE(aTHX_ PL_no_symref, sym, "a HASH");
35cd451c
GS
832 gv = (GV*)gv_fetchpv(sym, TRUE, SVt_PVHV);
833 }
834 }
835 else {
67955e0c 836 gv = (GV*)sv;
a0d0e21e 837 }
67955e0c 838 hv = GvHVn(gv);
533c011a 839 if (PL_op->op_private & OPpLVAL_INTRO)
67955e0c 840 hv = save_hash(gv);
533c011a 841 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
842 SETs((SV*)hv);
843 RETURN;
844 }
78f9721b
SM
845 else if (LVRET) {
846 if (GIMME == G_SCALAR)
847 Perl_croak(aTHX_ "Can't return hash to lvalue"
848 " scalar context");
849 SETs((SV*)hv);
850 RETURN;
851 }
a0d0e21e
LW
852 }
853 }
854
855 if (GIMME == G_ARRAY) { /* array wanted */
3280af22 856 *PL_stack_sp = (SV*)hv;
cea2e8a9 857 return do_kv();
a0d0e21e
LW
858 }
859 else {
860 dTARGET;
4b154ab5
GA
861 if (SvTYPE(hv) == SVt_PVAV)
862 hv = avhv_keys((AV*)hv);
b9c39e73 863 if (HvFILL(hv))
57def98f
JH
864 Perl_sv_setpvf(aTHX_ TARG, "%"IVdf"/%"IVdf,
865 (IV)HvFILL(hv), (IV)HvMAX(hv) + 1);
a0d0e21e
LW
866 else
867 sv_setiv(TARG, 0);
c750a3ec 868
a0d0e21e
LW
869 SETTARG;
870 RETURN;
871 }
872}
873
10c8fecd
GS
874STATIC int
875S_do_maybe_phash(pTHX_ AV *ary, SV **lelem, SV **firstlelem, SV **relem,
876 SV **lastrelem)
877{
878 OP *leftop;
10c8fecd
GS
879 I32 i;
880
881 leftop = ((BINOP*)PL_op)->op_last;
882 assert(leftop);
883 assert(leftop->op_type == OP_NULL && leftop->op_targ == OP_LIST);
884 leftop = ((LISTOP*)leftop)->op_first;
885 assert(leftop);
886 /* Skip PUSHMARK and each element already assigned to. */
887 for (i = lelem - firstlelem; i > 0; i--) {
888 leftop = leftop->op_sibling;
889 assert(leftop);
890 }
891 if (leftop->op_type != OP_RV2HV)
892 return 0;
893
894 /* pseudohash */
895 if (av_len(ary) > 0)
896 av_fill(ary, 0); /* clear all but the fields hash */
897 if (lastrelem >= relem) {
898 while (relem < lastrelem) { /* gobble up all the rest */
899 SV *tmpstr;
900 assert(relem[0]);
901 assert(relem[1]);
902 /* Avoid a memory leak when avhv_store_ent dies. */
903 tmpstr = sv_newmortal();
904 sv_setsv(tmpstr,relem[1]); /* value */
905 relem[1] = tmpstr;
906 if (avhv_store_ent(ary,relem[0],tmpstr,0))
d16e9ed9 907 (void)SvREFCNT_inc(tmpstr);
10c8fecd
GS
908 if (SvMAGICAL(ary) != 0 && SvSMAGICAL(tmpstr))
909 mg_set(tmpstr);
910 relem += 2;
911 TAINT_NOT;
912 }
913 }
914 if (relem == lastrelem)
915 return 1;
916 return 2;
917}
918
919STATIC void
920S_do_oddball(pTHX_ HV *hash, SV **relem, SV **firstrelem)
921{
922 if (*relem) {
923 SV *tmpstr;
924 if (ckWARN(WARN_MISC)) {
925 if (relem == firstrelem &&
926 SvROK(*relem) &&
927 (SvTYPE(SvRV(*relem)) == SVt_PVAV ||
928 SvTYPE(SvRV(*relem)) == SVt_PVHV))
929 {
930 Perl_warner(aTHX_ WARN_MISC,
931 "Reference found where even-sized list expected");
932 }
933 else
934 Perl_warner(aTHX_ WARN_MISC,
935 "Odd number of elements in hash assignment");
936 }
937 if (SvTYPE(hash) == SVt_PVAV) {
938 /* pseudohash */
939 tmpstr = sv_newmortal();
940 if (avhv_store_ent((AV*)hash,*relem,tmpstr,0))
d16e9ed9 941 (void)SvREFCNT_inc(tmpstr);
10c8fecd
GS
942 if (SvMAGICAL(hash) && SvSMAGICAL(tmpstr))
943 mg_set(tmpstr);
944 }
945 else {
946 HE *didstore;
947 tmpstr = NEWSV(29,0);
948 didstore = hv_store_ent(hash,*relem,tmpstr,0);
949 if (SvMAGICAL(hash)) {
950 if (SvSMAGICAL(tmpstr))
951 mg_set(tmpstr);
952 if (!didstore)
953 sv_2mortal(tmpstr);
954 }
955 }
956 TAINT_NOT;
957 }
958}
959
a0d0e21e
LW
960PP(pp_aassign)
961{
39644a26 962 dSP;
3280af22
NIS
963 SV **lastlelem = PL_stack_sp;
964 SV **lastrelem = PL_stack_base + POPMARK;
965 SV **firstrelem = PL_stack_base + POPMARK + 1;
a0d0e21e
LW
966 SV **firstlelem = lastrelem + 1;
967
968 register SV **relem;
969 register SV **lelem;
970
971 register SV *sv;
972 register AV *ary;
973
54310121 974 I32 gimme;
a0d0e21e
LW
975 HV *hash;
976 I32 i;
977 int magic;
978
3280af22 979 PL_delaymagic = DM_DELAY; /* catch simultaneous items */
a0d0e21e
LW
980
981 /* If there's a common identifier on both sides we have to take
982 * special care that assigning the identifier on the left doesn't
983 * clobber a value on the right that's used later in the list.
984 */
10c8fecd 985 if (PL_op->op_private & (OPpASSIGN_COMMON)) {
cc5e57d2 986 EXTEND_MORTAL(lastrelem - firstrelem + 1);
10c8fecd
GS
987 for (relem = firstrelem; relem <= lastrelem; relem++) {
988 /*SUPPRESS 560*/
155aba94 989 if ((sv = *relem)) {
a1f49e72 990 TAINT_NOT; /* Each item is independent */
10c8fecd 991 *relem = sv_mortalcopy(sv);
a1f49e72 992 }
10c8fecd 993 }
a0d0e21e
LW
994 }
995
996 relem = firstrelem;
997 lelem = firstlelem;
998 ary = Null(AV*);
999 hash = Null(HV*);
10c8fecd 1000
a0d0e21e 1001 while (lelem <= lastlelem) {
bbce6d69 1002 TAINT_NOT; /* Each item stands on its own, taintwise. */
a0d0e21e
LW
1003 sv = *lelem++;
1004 switch (SvTYPE(sv)) {
1005 case SVt_PVAV:
1006 ary = (AV*)sv;
748a9306 1007 magic = SvMAGICAL(ary) != 0;
10c8fecd
GS
1008 if (PL_op->op_private & OPpASSIGN_HASH) {
1009 switch (do_maybe_phash(ary, lelem, firstlelem, relem,
1010 lastrelem))
1011 {
1012 case 0:
1013 goto normal_array;
1014 case 1:
1015 do_oddball((HV*)ary, relem, firstrelem);
1016 }
1017 relem = lastrelem + 1;
1018 break;
1019 }
1020 normal_array:
a0d0e21e 1021 av_clear(ary);
7e42bd57 1022 av_extend(ary, lastrelem - relem);
a0d0e21e
LW
1023 i = 0;
1024 while (relem <= lastrelem) { /* gobble up all the rest */
5117ca91 1025 SV **didstore;
a0d0e21e
LW
1026 sv = NEWSV(28,0);
1027 assert(*relem);
1028 sv_setsv(sv,*relem);
1029 *(relem++) = sv;
5117ca91
GS
1030 didstore = av_store(ary,i++,sv);
1031 if (magic) {
fb73857a
PP
1032 if (SvSMAGICAL(sv))
1033 mg_set(sv);
5117ca91 1034 if (!didstore)
8127e0e3 1035 sv_2mortal(sv);
5117ca91 1036 }
bbce6d69 1037 TAINT_NOT;
a0d0e21e
LW
1038 }
1039 break;
10c8fecd 1040 case SVt_PVHV: { /* normal hash */
a0d0e21e
LW
1041 SV *tmpstr;
1042
1043 hash = (HV*)sv;
748a9306 1044 magic = SvMAGICAL(hash) != 0;
a0d0e21e
LW
1045 hv_clear(hash);
1046
1047 while (relem < lastrelem) { /* gobble up all the rest */
5117ca91 1048 HE *didstore;
4633a7c4 1049 if (*relem)
a0d0e21e 1050 sv = *(relem++);
4633a7c4 1051 else
3280af22 1052 sv = &PL_sv_no, relem++;
a0d0e21e
LW
1053 tmpstr = NEWSV(29,0);
1054 if (*relem)
1055 sv_setsv(tmpstr,*relem); /* value */
1056 *(relem++) = tmpstr;
5117ca91
GS
1057 didstore = hv_store_ent(hash,sv,tmpstr,0);
1058 if (magic) {
fb73857a
PP
1059 if (SvSMAGICAL(tmpstr))
1060 mg_set(tmpstr);
5117ca91 1061 if (!didstore)
8127e0e3 1062 sv_2mortal(tmpstr);
5117ca91 1063 }
bbce6d69 1064 TAINT_NOT;
8e07c86e 1065 }
6a0deba8 1066 if (relem == lastrelem) {
10c8fecd 1067 do_oddball(hash, relem, firstrelem);
6a0deba8 1068 relem++;
1930e939 1069 }
a0d0e21e
LW
1070 }
1071 break;
1072 default:
6fc92669
GS
1073 if (SvIMMORTAL(sv)) {
1074 if (relem <= lastrelem)
1075 relem++;
1076 break;
a0d0e21e
LW
1077 }
1078 if (relem <= lastrelem) {
1079 sv_setsv(sv, *relem);
1080 *(relem++) = sv;
1081 }
1082 else
3280af22 1083 sv_setsv(sv, &PL_sv_undef);
a0d0e21e
LW
1084 SvSETMAGIC(sv);
1085 break;
1086 }
1087 }
3280af22
NIS
1088 if (PL_delaymagic & ~DM_DELAY) {
1089 if (PL_delaymagic & DM_UID) {
a0d0e21e 1090#ifdef HAS_SETRESUID
b28d0864 1091 (void)setresuid(PL_uid,PL_euid,(Uid_t)-1);
56febc5e
AD
1092#else
1093# ifdef HAS_SETREUID
3280af22 1094 (void)setreuid(PL_uid,PL_euid);
56febc5e
AD
1095# else
1096# ifdef HAS_SETRUID
b28d0864
NIS
1097 if ((PL_delaymagic & DM_UID) == DM_RUID) {
1098 (void)setruid(PL_uid);
1099 PL_delaymagic &= ~DM_RUID;
a0d0e21e 1100 }
56febc5e
AD
1101# endif /* HAS_SETRUID */
1102# ifdef HAS_SETEUID
b28d0864
NIS
1103 if ((PL_delaymagic & DM_UID) == DM_EUID) {
1104 (void)seteuid(PL_uid);
1105 PL_delaymagic &= ~DM_EUID;
a0d0e21e 1106 }
56febc5e 1107# endif /* HAS_SETEUID */
b28d0864
NIS
1108 if (PL_delaymagic & DM_UID) {
1109 if (PL_uid != PL_euid)
cea2e8a9 1110 DIE(aTHX_ "No setreuid available");
b28d0864 1111 (void)PerlProc_setuid(PL_uid);
a0d0e21e 1112 }
56febc5e
AD
1113# endif /* HAS_SETREUID */
1114#endif /* HAS_SETRESUID */
d8eceb89
JH
1115 PL_uid = PerlProc_getuid();
1116 PL_euid = PerlProc_geteuid();
a0d0e21e 1117 }
3280af22 1118 if (PL_delaymagic & DM_GID) {
a0d0e21e 1119#ifdef HAS_SETRESGID
b28d0864 1120 (void)setresgid(PL_gid,PL_egid,(Gid_t)-1);
56febc5e
AD
1121#else
1122# ifdef HAS_SETREGID
3280af22 1123 (void)setregid(PL_gid,PL_egid);
56febc5e
AD
1124# else
1125# ifdef HAS_SETRGID
b28d0864
NIS
1126 if ((PL_delaymagic & DM_GID) == DM_RGID) {
1127 (void)setrgid(PL_gid);
1128 PL_delaymagic &= ~DM_RGID;
a0d0e21e 1129 }
56febc5e
AD
1130# endif /* HAS_SETRGID */
1131# ifdef HAS_SETEGID
b28d0864
NIS
1132 if ((PL_delaymagic & DM_GID) == DM_EGID) {
1133 (void)setegid(PL_gid);
1134 PL_delaymagic &= ~DM_EGID;
a0d0e21e 1135 }
56febc5e 1136# endif /* HAS_SETEGID */
b28d0864
NIS
1137 if (PL_delaymagic & DM_GID) {
1138 if (PL_gid != PL_egid)
cea2e8a9 1139 DIE(aTHX_ "No setregid available");
b28d0864 1140 (void)PerlProc_setgid(PL_gid);
a0d0e21e 1141 }
56febc5e
AD
1142# endif /* HAS_SETREGID */
1143#endif /* HAS_SETRESGID */
d8eceb89
JH
1144 PL_gid = PerlProc_getgid();
1145 PL_egid = PerlProc_getegid();
a0d0e21e 1146 }
3280af22 1147 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
a0d0e21e 1148 }
3280af22 1149 PL_delaymagic = 0;
54310121
PP
1150
1151 gimme = GIMME_V;
1152 if (gimme == G_VOID)
1153 SP = firstrelem - 1;
1154 else if (gimme == G_SCALAR) {
1155 dTARGET;
1156 SP = firstrelem;
1157 SETi(lastrelem - firstrelem + 1);
1158 }
1159 else {
a0d0e21e
LW
1160 if (ary || hash)
1161 SP = lastrelem;
1162 else
1163 SP = firstrelem + (lastlelem - firstlelem);
0c8c7a05 1164 lelem = firstlelem + (relem - firstrelem);
5f05dabc 1165 while (relem <= SP)
3280af22 1166 *relem++ = (lelem <= lastlelem) ? *lelem++ : &PL_sv_undef;
a0d0e21e 1167 }
54310121 1168 RETURN;
a0d0e21e
LW
1169}
1170
8782bef2
GB
1171PP(pp_qr)
1172{
39644a26 1173 dSP;
8782bef2
GB
1174 register PMOP *pm = cPMOP;
1175 SV *rv = sv_newmortal();
57668c4d 1176 SV *sv = newSVrv(rv, "Regexp");
e08e52cf
AMS
1177 if (pm->op_pmdynflags & PMdf_TAINTED)
1178 SvTAINTED_on(rv);
aaa362c4 1179 sv_magic(sv,(SV*)ReREFCNT_inc(PM_GETRE(pm)), PERL_MAGIC_qr,0,0);
8782bef2
GB
1180 RETURNX(PUSHs(rv));
1181}
1182
a0d0e21e
LW
1183PP(pp_match)
1184{
39644a26 1185 dSP; dTARG;
a0d0e21e
LW
1186 register PMOP *pm = cPMOP;
1187 register char *t;
1188 register char *s;
1189 char *strend;
1190 I32 global;
f722798b
IZ
1191 I32 r_flags = REXEC_CHECKED;
1192 char *truebase; /* Start of string */
aaa362c4 1193 register REGEXP *rx = PM_GETRE(pm);
b3eb6a9b 1194 bool rxtainted;
a0d0e21e
LW
1195 I32 gimme = GIMME;
1196 STRLEN len;
748a9306 1197 I32 minmatch = 0;
3280af22 1198 I32 oldsave = PL_savestack_ix;
f86702cc 1199 I32 update_minmatch = 1;
e60df1fa 1200 I32 had_zerolen = 0;
a0d0e21e 1201
533c011a 1202 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e
LW
1203 TARG = POPs;
1204 else {
54b9620d 1205 TARG = DEFSV;
a0d0e21e
LW
1206 EXTEND(SP,1);
1207 }
d9f424b2 1208
c277df42 1209 PUTBACK; /* EVAL blocks need stack_sp. */
a0d0e21e
LW
1210 s = SvPV(TARG, len);
1211 strend = s + len;
1212 if (!s)
2269b42e 1213 DIE(aTHX_ "panic: pp_match");
b3eb6a9b 1214 rxtainted = ((pm->op_pmdynflags & PMdf_TAINTED) ||
3280af22 1215 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
9212bbba 1216 TAINT_NOT;
a0d0e21e 1217
53c4c00c 1218 PL_reg_match_utf8 = DO_UTF8(TARG);
d9f424b2 1219
48c036b1 1220 if (pm->op_pmdynflags & PMdf_USED) {
c277df42 1221 failure:
a0d0e21e
LW
1222 if (gimme == G_ARRAY)
1223 RETURN;
1224 RETPUSHNO;
1225 }
1226
3280af22
NIS
1227 if (!rx->prelen && PL_curpm) {
1228 pm = PL_curpm;
aaa362c4 1229 rx = PM_GETRE(pm);
a0d0e21e 1230 }
61a36c01 1231 if (rx->minlen > len)
9e55ce06 1232 goto failure;
c277df42 1233
a0d0e21e 1234 truebase = t = s;
ad94a511
IZ
1235
1236 /* XXXX What part of this is needed with true \G-support? */
155aba94 1237 if ((global = pm->op_pmflags & PMf_GLOBAL)) {
cf93c79d 1238 rx->startp[0] = -1;
a0d0e21e 1239 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
14befaf4 1240 MAGIC* mg = mg_find(TARG, PERL_MAGIC_regex_global);
565764a8 1241 if (mg && mg->mg_len >= 0) {
b7a35066 1242 if (!(rx->reganch & ROPT_GPOS_SEEN))
1c846c1f 1243 rx->endp[0] = rx->startp[0] = mg->mg_len;
0ef3e39e
HS
1244 else if (rx->reganch & ROPT_ANCH_GPOS) {
1245 r_flags |= REXEC_IGNOREPOS;
1c846c1f 1246 rx->endp[0] = rx->startp[0] = mg->mg_len;
0ef3e39e 1247 }
748a9306 1248 minmatch = (mg->mg_flags & MGf_MINMATCH);
f86702cc 1249 update_minmatch = 0;
748a9306 1250 }
a0d0e21e
LW
1251 }
1252 }
14977893
JH
1253 if ((!global && rx->nparens)
1254 || SvTEMP(TARG) || PL_sawampersand)
1255 r_flags |= REXEC_COPY_STR;
1c846c1f 1256 if (SvSCREAM(TARG))
22e551b9
IZ
1257 r_flags |= REXEC_SCREAM;
1258
a0d0e21e 1259 if (pm->op_pmflags & (PMf_MULTILINE|PMf_SINGLELINE)) {
3280af22
NIS
1260 SAVEINT(PL_multiline);
1261 PL_multiline = pm->op_pmflags & PMf_MULTILINE;
a0d0e21e
LW
1262 }
1263
1264play_it_again:
cf93c79d
IZ
1265 if (global && rx->startp[0] != -1) {
1266 t = s = rx->endp[0] + truebase;
d9f97599 1267 if ((s + rx->minlen) > strend)
a0d0e21e 1268 goto nope;
f86702cc 1269 if (update_minmatch++)
e60df1fa 1270 minmatch = had_zerolen;
a0d0e21e 1271 }
60aeb6fd
NIS
1272 if (rx->reganch & RE_USE_INTUIT &&
1273 DO_UTF8(TARG) == ((rx->reganch & ROPT_UTF8) != 0)) {
ee0b7718 1274 PL_bostr = truebase;
f722798b
IZ
1275 s = CALLREG_INTUIT_START(aTHX_ rx, TARG, s, strend, r_flags, NULL);
1276
1277 if (!s)
1278 goto nope;
1279 if ( (rx->reganch & ROPT_CHECK_ALL)
14977893 1280 && !PL_sawampersand
f722798b
IZ
1281 && ((rx->reganch & ROPT_NOSCAN)
1282 || !((rx->reganch & RE_INTUIT_TAIL)
05b4157f
GS
1283 && (r_flags & REXEC_SCREAM)))
1284 && !SvROK(TARG)) /* Cannot trust since INTUIT cannot guess ^ */
f722798b 1285 goto yup;
a0d0e21e 1286 }
cea2e8a9 1287 if (CALLREGEXEC(aTHX_ rx, s, strend, truebase, minmatch, TARG, NULL, r_flags))
bbce6d69 1288 {
3280af22 1289 PL_curpm = pm;
a0d0e21e 1290 if (pm->op_pmflags & PMf_ONCE)
48c036b1 1291 pm->op_pmdynflags |= PMdf_USED;
a0d0e21e
LW
1292 goto gotcha;
1293 }
1294 else
1295 goto ret_no;
1296 /*NOTREACHED*/
1297
1298 gotcha:
72311751
GS
1299 if (rxtainted)
1300 RX_MATCH_TAINTED_on(rx);
1301 TAINT_IF(RX_MATCH_TAINTED(rx));
a0d0e21e 1302 if (gimme == G_ARRAY) {
ffc61ed2 1303 I32 nparens, i, len;
a0d0e21e 1304
ffc61ed2
JH
1305 nparens = rx->nparens;
1306 if (global && !nparens)
a0d0e21e
LW
1307 i = 1;
1308 else
1309 i = 0;
c277df42 1310 SPAGAIN; /* EVAL blocks could move the stack. */
ffc61ed2
JH
1311 EXTEND(SP, nparens + i);
1312 EXTEND_MORTAL(nparens + i);
1313 for (i = !i; i <= nparens; i++) {
a0d0e21e
LW
1314 PUSHs(sv_newmortal());
1315 /*SUPPRESS 560*/
cf93c79d
IZ
1316 if ((rx->startp[i] != -1) && rx->endp[i] != -1 ) {
1317 len = rx->endp[i] - rx->startp[i];
290deeac
A
1318 if (rx->endp[i] < 0 || rx->startp[i] < 0 ||
1319 len < 0 || len > strend - s)
1320 DIE(aTHX_ "panic: pp_match start/end pointers");
cf93c79d 1321 s = rx->startp[i] + truebase;
a0d0e21e 1322 sv_setpvn(*SP, s, len);
cce850e4 1323 if (DO_UTF8(TARG) && is_utf8_string((U8*)s, len))
a197cbdd 1324 SvUTF8_on(*SP);
a0d0e21e
LW
1325 }
1326 }
1327 if (global) {
0af80b60
HS
1328 if (pm->op_pmflags & PMf_CONTINUE) {
1329 MAGIC* mg = 0;
1330 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
1331 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1332 if (!mg) {
1333 sv_magic(TARG, (SV*)0, PERL_MAGIC_regex_global, Nullch, 0);
1334 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1335 }
1336 if (rx->startp[0] != -1) {
1337 mg->mg_len = rx->endp[0];
1338 if (rx->startp[0] == rx->endp[0])
1339 mg->mg_flags |= MGf_MINMATCH;
1340 else
1341 mg->mg_flags &= ~MGf_MINMATCH;
1342 }
1343 }
cf93c79d
IZ
1344 had_zerolen = (rx->startp[0] != -1
1345 && rx->startp[0] == rx->endp[0]);
c277df42 1346 PUTBACK; /* EVAL blocks may use stack */
cf93c79d 1347 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
1348 goto play_it_again;
1349 }
ffc61ed2 1350 else if (!nparens)
bde848c5 1351 XPUSHs(&PL_sv_yes);
4633a7c4 1352 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1353 RETURN;
1354 }
1355 else {
1356 if (global) {
1357 MAGIC* mg = 0;
1358 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
14befaf4 1359 mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1360 if (!mg) {
14befaf4
DM
1361 sv_magic(TARG, (SV*)0, PERL_MAGIC_regex_global, Nullch, 0);
1362 mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1363 }
cf93c79d
IZ
1364 if (rx->startp[0] != -1) {
1365 mg->mg_len = rx->endp[0];
d9f97599 1366 if (rx->startp[0] == rx->endp[0])
748a9306
LW
1367 mg->mg_flags |= MGf_MINMATCH;
1368 else
1369 mg->mg_flags &= ~MGf_MINMATCH;
1370 }
a0d0e21e 1371 }
4633a7c4 1372 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1373 RETPUSHYES;
1374 }
1375
f722798b 1376yup: /* Confirmed by INTUIT */
72311751
GS
1377 if (rxtainted)
1378 RX_MATCH_TAINTED_on(rx);
1379 TAINT_IF(RX_MATCH_TAINTED(rx));
3280af22 1380 PL_curpm = pm;
a0d0e21e 1381 if (pm->op_pmflags & PMf_ONCE)
48c036b1 1382 pm->op_pmdynflags |= PMdf_USED;
cf93c79d
IZ
1383 if (RX_MATCH_COPIED(rx))
1384 Safefree(rx->subbeg);
1385 RX_MATCH_COPIED_off(rx);
1386 rx->subbeg = Nullch;
a0d0e21e 1387 if (global) {
d9f97599 1388 rx->subbeg = truebase;
cf93c79d 1389 rx->startp[0] = s - truebase;
53c4c00c 1390 if (PL_reg_match_utf8) {
60aeb6fd
NIS
1391 char *t = (char*)utf8_hop((U8*)s, rx->minlen);
1392 rx->endp[0] = t - truebase;
1393 }
1394 else {
1395 rx->endp[0] = s - truebase + rx->minlen;
1396 }
cf93c79d 1397 rx->sublen = strend - truebase;
a0d0e21e 1398 goto gotcha;
1c846c1f 1399 }
14977893
JH
1400 if (PL_sawampersand) {
1401 I32 off;
1402
1403 rx->subbeg = savepvn(t, strend - t);
1404 rx->sublen = strend - t;
1405 RX_MATCH_COPIED_on(rx);
1406 off = rx->startp[0] = s - t;
1407 rx->endp[0] = off + rx->minlen;
1408 }
1409 else { /* startp/endp are used by @- @+. */
1410 rx->startp[0] = s - truebase;
1411 rx->endp[0] = s - truebase + rx->minlen;
1412 }
fc19f8d0 1413 rx->nparens = rx->lastparen = 0; /* used by @- and @+ */
4633a7c4 1414 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1415 RETPUSHYES;
1416
1417nope:
a0d0e21e 1418ret_no:
c90c0ff4 1419 if (global && !(pm->op_pmflags & PMf_CONTINUE)) {
a0d0e21e 1420 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
14befaf4 1421 MAGIC* mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1422 if (mg)
565764a8 1423 mg->mg_len = -1;
a0d0e21e
LW
1424 }
1425 }
4633a7c4 1426 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1427 if (gimme == G_ARRAY)
1428 RETURN;
1429 RETPUSHNO;
1430}
1431
1432OP *
864dbfa3 1433Perl_do_readline(pTHX)
a0d0e21e
LW
1434{
1435 dSP; dTARGETSTACKED;
1436 register SV *sv;
1437 STRLEN tmplen = 0;
1438 STRLEN offset;
760ac839 1439 PerlIO *fp;
3280af22 1440 register IO *io = GvIO(PL_last_in_gv);
533c011a 1441 register I32 type = PL_op->op_type;
54310121 1442 I32 gimme = GIMME_V;
e79b0511 1443 MAGIC *mg;
a0d0e21e 1444
5b468f54 1445 if (io && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar))) {
e79b0511 1446 PUSHMARK(SP);
5b468f54 1447 XPUSHs(SvTIED_obj((SV*)io, mg));
e79b0511
PP
1448 PUTBACK;
1449 ENTER;
864dbfa3 1450 call_method("READLINE", gimme);
e79b0511
PP
1451 LEAVE;
1452 SPAGAIN;
54310121
PP
1453 if (gimme == G_SCALAR)
1454 SvSetMagicSV_nosteal(TARG, TOPs);
e79b0511
PP
1455 RETURN;
1456 }
a0d0e21e
LW
1457 fp = Nullfp;
1458 if (io) {
1459 fp = IoIFP(io);
1460 if (!fp) {
1461 if (IoFLAGS(io) & IOf_ARGV) {
1462 if (IoFLAGS(io) & IOf_START) {
a0d0e21e 1463 IoLINES(io) = 0;
3280af22 1464 if (av_len(GvAVn(PL_last_in_gv)) < 0) {
1d7c1841 1465 IoFLAGS(io) &= ~IOf_START;
9d116dd7 1466 do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,Nullfp);
3280af22
NIS
1467 sv_setpvn(GvSV(PL_last_in_gv), "-", 1);
1468 SvSETMAGIC(GvSV(PL_last_in_gv));
a2008d6d
GS
1469 fp = IoIFP(io);
1470 goto have_fp;
a0d0e21e
LW
1471 }
1472 }
3280af22 1473 fp = nextargv(PL_last_in_gv);
a0d0e21e 1474 if (!fp) { /* Note: fp != IoIFP(io) */
3280af22 1475 (void)do_close(PL_last_in_gv, FALSE); /* now it does*/
a0d0e21e
LW
1476 }
1477 }
0d44d22b
NC
1478 else if (type == OP_GLOB)
1479 fp = Perl_start_glob(aTHX_ POPs, io);
a0d0e21e
LW
1480 }
1481 else if (type == OP_GLOB)
1482 SP--;
a00b5bd3 1483 else if (ckWARN(WARN_IO) && IoTYPE(io) == IoTYPE_WRONLY) {
4c80c0b2 1484 report_evil_fh(PL_last_in_gv, io, OP_phoney_OUTPUT_ONLY);
a00b5bd3 1485 }
a0d0e21e
LW
1486 }
1487 if (!fp) {
790090df
HS
1488 if (ckWARN2(WARN_GLOB, WARN_CLOSED)
1489 && (!io || !(IoFLAGS(io) & IOf_START))) {
3f4520fe 1490 if (type == OP_GLOB)
e476b1b5 1491 Perl_warner(aTHX_ WARN_GLOB,
af8c498a
GS
1492 "glob failed (can't start child: %s)",
1493 Strerror(errno));
69282e91 1494 else
bc37a18f 1495 report_evil_fh(PL_last_in_gv, io, PL_op->op_type);
3f4520fe 1496 }
54310121 1497 if (gimme == G_SCALAR) {
a0d0e21e
LW
1498 (void)SvOK_off(TARG);
1499 PUSHTARG;
1500 }
1501 RETURN;
1502 }
a2008d6d 1503 have_fp:
54310121 1504 if (gimme == G_SCALAR) {
a0d0e21e 1505 sv = TARG;
9607fc9c
PP
1506 if (SvROK(sv))
1507 sv_unref(sv);
a0d0e21e
LW
1508 (void)SvUPGRADE(sv, SVt_PV);
1509 tmplen = SvLEN(sv); /* remember if already alloced */
1510 if (!tmplen)
1511 Sv_Grow(sv, 80); /* try short-buffering it */
1512 if (type == OP_RCATLINE)
1513 offset = SvCUR(sv);
1514 else
1515 offset = 0;
1516 }
54310121
PP
1517 else {
1518 sv = sv_2mortal(NEWSV(57, 80));
1519 offset = 0;
1520 }
fbad3eb5 1521
3887d568
AP
1522 /* This should not be marked tainted if the fp is marked clean */
1523#define MAYBE_TAINT_LINE(io, sv) \
1524 if (!(IoFLAGS(io) & IOf_UNTAINT)) { \
1525 TAINT; \
1526 SvTAINTED_on(sv); \
1527 }
1528
684bef36 1529/* delay EOF state for a snarfed empty file */
fbad3eb5 1530#define SNARF_EOF(gimme,rs,io,sv) \
684bef36 1531 (gimme != G_SCALAR || SvCUR(sv) \
b9fee9ba 1532 || (IoFLAGS(io) & IOf_NOLINE) || !RsSNARF(rs))
fbad3eb5 1533
a0d0e21e 1534 for (;;) {
09e8efcc 1535 PUTBACK;
fbad3eb5
GS
1536 if (!sv_gets(sv, fp, offset)
1537 && (type == OP_GLOB || SNARF_EOF(gimme, PL_rs, io, sv)))
1538 {
760ac839 1539 PerlIO_clearerr(fp);
a0d0e21e 1540 if (IoFLAGS(io) & IOf_ARGV) {
3280af22 1541 fp = nextargv(PL_last_in_gv);
a0d0e21e
LW
1542 if (fp)
1543 continue;
3280af22 1544 (void)do_close(PL_last_in_gv, FALSE);
a0d0e21e
LW
1545 }
1546 else if (type == OP_GLOB) {
e476b1b5
GS
1547 if (!do_close(PL_last_in_gv, FALSE) && ckWARN(WARN_GLOB)) {
1548 Perl_warner(aTHX_ WARN_GLOB,
4eb79ab5 1549 "glob failed (child exited with status %d%s)",
894356b3 1550 (int)(STATUS_CURRENT >> 8),
cf494569 1551 (STATUS_CURRENT & 0x80) ? ", core dumped" : "");
4eb79ab5 1552 }
a0d0e21e 1553 }
54310121 1554 if (gimme == G_SCALAR) {
a0d0e21e 1555 (void)SvOK_off(TARG);
09e8efcc 1556 SPAGAIN;
a0d0e21e
LW
1557 PUSHTARG;
1558 }
3887d568 1559 MAYBE_TAINT_LINE(io, sv);
a0d0e21e
LW
1560 RETURN;
1561 }
3887d568 1562 MAYBE_TAINT_LINE(io, sv);
a0d0e21e 1563 IoLINES(io)++;
b9fee9ba 1564 IoFLAGS(io) |= IOf_NOLINE;
71be2cbc 1565 SvSETMAGIC(sv);
09e8efcc 1566 SPAGAIN;
a0d0e21e 1567 XPUSHs(sv);
a0d0e21e
LW
1568 if (type == OP_GLOB) {
1569 char *tmps;
1570
3280af22 1571 if (SvCUR(sv) > 0 && SvCUR(PL_rs) > 0) {
c07a80fd 1572 tmps = SvEND(sv) - 1;
3280af22 1573 if (*tmps == *SvPVX(PL_rs)) {
c07a80fd
PP
1574 *tmps = '\0';
1575 SvCUR(sv)--;
1576 }
1577 }
a0d0e21e
LW
1578 for (tmps = SvPVX(sv); *tmps; tmps++)
1579 if (!isALPHA(*tmps) && !isDIGIT(*tmps) &&
1580 strchr("$&*(){}[]'\";\\|?<>~`", *tmps))
1581 break;
43384a1a 1582 if (*tmps && PerlLIO_lstat(SvPVX(sv), &PL_statbuf) < 0) {
a0d0e21e
LW
1583 (void)POPs; /* Unmatched wildcard? Chuck it... */
1584 continue;
1585 }
1586 }
54310121 1587 if (gimme == G_ARRAY) {
a0d0e21e
LW
1588 if (SvLEN(sv) - SvCUR(sv) > 20) {
1589 SvLEN_set(sv, SvCUR(sv)+1);
1590 Renew(SvPVX(sv), SvLEN(sv), char);
1591 }
1592 sv = sv_2mortal(NEWSV(58, 80));
1593 continue;
1594 }
54310121 1595 else if (gimme == G_SCALAR && !tmplen && SvLEN(sv) - SvCUR(sv) > 80) {
a0d0e21e
LW
1596 /* try to reclaim a bit of scalar space (only on 1st alloc) */
1597 if (SvCUR(sv) < 60)
1598 SvLEN_set(sv, 80);
1599 else
1600 SvLEN_set(sv, SvCUR(sv)+40); /* allow some slop */
1601 Renew(SvPVX(sv), SvLEN(sv), char);
1602 }
1603 RETURN;
1604 }
1605}
1606
1607PP(pp_enter)
1608{
39644a26 1609 dSP;
c09156bb 1610 register PERL_CONTEXT *cx;
533c011a 1611 I32 gimme = OP_GIMME(PL_op, -1);
a0d0e21e 1612
54310121
PP
1613 if (gimme == -1) {
1614 if (cxstack_ix >= 0)
1615 gimme = cxstack[cxstack_ix].blk_gimme;
1616 else
1617 gimme = G_SCALAR;
1618 }
a0d0e21e
LW
1619
1620 ENTER;
1621
1622 SAVETMPS;
924508f0 1623 PUSHBLOCK(cx, CXt_BLOCK, SP);
a0d0e21e
LW
1624
1625 RETURN;
1626}
1627
1628PP(pp_helem)
1629{
39644a26 1630 dSP;
760ac839 1631 HE* he;
ae77835f 1632 SV **svp;
a0d0e21e 1633 SV *keysv = POPs;
a0d0e21e 1634 HV *hv = (HV*)POPs;
78f9721b 1635 U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
533c011a 1636 U32 defer = PL_op->op_private & OPpLVAL_DEFER;
be6c24e0 1637 SV *sv;
1c846c1f 1638 U32 hash = (SvFAKE(keysv) && SvREADONLY(keysv)) ? SvUVX(keysv) : 0;
9c5ffd7c 1639 I32 preeminent = 0;
a0d0e21e 1640
ae77835f 1641 if (SvTYPE(hv) == SVt_PVHV) {
1f5346dc
SC
1642 if (PL_op->op_private & OPpLVAL_INTRO)
1643 preeminent = SvRMAGICAL(hv) ? 1 : hv_exists_ent(hv, keysv, 0);
1c846c1f 1644 he = hv_fetch_ent(hv, keysv, lval && !defer, hash);
97fcbf96 1645 svp = he ? &HeVAL(he) : 0;
ae77835f
MB
1646 }
1647 else if (SvTYPE(hv) == SVt_PVAV) {
0ebe0038 1648 if (PL_op->op_private & OPpLVAL_INTRO)
cea2e8a9 1649 DIE(aTHX_ "Can't localize pseudo-hash element");
1c846c1f 1650 svp = avhv_fetch_ent((AV*)hv, keysv, lval && !defer, hash);
ae77835f 1651 }
c750a3ec 1652 else {
a0d0e21e 1653 RETPUSHUNDEF;
c750a3ec 1654 }
a0d0e21e 1655 if (lval) {
3280af22 1656 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
1657 SV* lv;
1658 SV* key2;
2d8e6c8d
GS
1659 if (!defer) {
1660 STRLEN n_a;
cea2e8a9 1661 DIE(aTHX_ PL_no_helem, SvPV(keysv, n_a));
2d8e6c8d 1662 }
68dc0745
PP
1663 lv = sv_newmortal();
1664 sv_upgrade(lv, SVt_PVLV);
1665 LvTYPE(lv) = 'y';
14befaf4 1666 sv_magic(lv, key2 = newSVsv(keysv), PERL_MAGIC_defelem, Nullch, 0);
68dc0745
PP
1667 SvREFCNT_dec(key2); /* sv_magic() increments refcount */
1668 LvTARG(lv) = SvREFCNT_inc(hv);
1669 LvTARGLEN(lv) = 1;
1670 PUSHs(lv);
1671 RETURN;
1672 }
533c011a 1673 if (PL_op->op_private & OPpLVAL_INTRO) {
ae77835f 1674 if (HvNAME(hv) && isGV(*svp))
533c011a 1675 save_gp((GV*)*svp, !(PL_op->op_flags & OPf_SPECIAL));
1f5346dc
SC
1676 else {
1677 if (!preeminent) {
1678 STRLEN keylen;
1679 char *key = SvPV(keysv, keylen);
57813020 1680 SAVEDELETE(hv, savepvn(key,keylen), keylen);
a12c0f56 1681 } else
1f5346dc
SC
1682 save_helem(hv, keysv, svp);
1683 }
5f05dabc 1684 }
533c011a
NIS
1685 else if (PL_op->op_private & OPpDEREF)
1686 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 1687 }
3280af22 1688 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
1689 /* This makes C<local $tied{foo} = $tied{foo}> possible.
1690 * Pushing the magical RHS on to the stack is useless, since
1691 * that magic is soon destined to be misled by the local(),
1692 * and thus the later pp_sassign() will fail to mg_get() the
1693 * old value. This should also cure problems with delayed
1694 * mg_get()s. GSAR 98-07-03 */
1695 if (!lval && SvGMAGICAL(sv))
1696 sv = sv_mortalcopy(sv);
1697 PUSHs(sv);
a0d0e21e
LW
1698 RETURN;
1699}
1700
1701PP(pp_leave)
1702{
39644a26 1703 dSP;
c09156bb 1704 register PERL_CONTEXT *cx;
a0d0e21e
LW
1705 register SV **mark;
1706 SV **newsp;
1707 PMOP *newpm;
1708 I32 gimme;
1709
533c011a 1710 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e 1711 cx = &cxstack[cxstack_ix];
3280af22 1712 cx->blk_oldpm = PL_curpm; /* fake block should preserve $1 et al */
a0d0e21e
LW
1713 }
1714
1715 POPBLOCK(cx,newpm);
1716
533c011a 1717 gimme = OP_GIMME(PL_op, -1);
54310121
PP
1718 if (gimme == -1) {
1719 if (cxstack_ix >= 0)
1720 gimme = cxstack[cxstack_ix].blk_gimme;
1721 else
1722 gimme = G_SCALAR;
1723 }
a0d0e21e 1724
a1f49e72 1725 TAINT_NOT;
54310121
PP
1726 if (gimme == G_VOID)
1727 SP = newsp;
1728 else if (gimme == G_SCALAR) {
1729 MARK = newsp + 1;
09256e2f 1730 if (MARK <= SP) {
54310121
PP
1731 if (SvFLAGS(TOPs) & (SVs_PADTMP|SVs_TEMP))
1732 *MARK = TOPs;
1733 else
1734 *MARK = sv_mortalcopy(TOPs);
09256e2f 1735 } else {
54310121 1736 MEXTEND(mark,0);
3280af22 1737 *MARK = &PL_sv_undef;
a0d0e21e 1738 }
54310121 1739 SP = MARK;
a0d0e21e 1740 }
54310121 1741 else if (gimme == G_ARRAY) {
a1f49e72
CS
1742 /* in case LEAVE wipes old return values */
1743 for (mark = newsp + 1; mark <= SP; mark++) {
1744 if (!(SvFLAGS(*mark) & (SVs_PADTMP|SVs_TEMP))) {
a0d0e21e 1745 *mark = sv_mortalcopy(*mark);
a1f49e72
CS
1746 TAINT_NOT; /* Each item is independent */
1747 }
1748 }
a0d0e21e 1749 }
3280af22 1750 PL_curpm = newpm; /* Don't pop $1 et al till now */
a0d0e21e
LW
1751
1752 LEAVE;
1753
1754 RETURN;
1755}
1756
1757PP(pp_iter)
1758{
39644a26 1759 dSP;
c09156bb 1760 register PERL_CONTEXT *cx;
5f05dabc 1761 SV* sv;
4633a7c4 1762 AV* av;
1d7c1841 1763 SV **itersvp;
a0d0e21e 1764
924508f0 1765 EXTEND(SP, 1);
a0d0e21e 1766 cx = &cxstack[cxstack_ix];
6b35e009 1767 if (CxTYPE(cx) != CXt_LOOP)
cea2e8a9 1768 DIE(aTHX_ "panic: pp_iter");
a0d0e21e 1769
1d7c1841 1770 itersvp = CxITERVAR(cx);
4633a7c4 1771 av = cx->blk_loop.iterary;
89ea2908
GA
1772 if (SvTYPE(av) != SVt_PVAV) {
1773 /* iterate ($min .. $max) */
1774 if (cx->blk_loop.iterlval) {
1775 /* string increment */
1776 register SV* cur = cx->blk_loop.iterlval;
1777 STRLEN maxlen;
1778 char *max = SvPV((SV*)av, maxlen);
1779 if (!SvNIOK(cur) && SvCUR(cur) <= maxlen) {
4d1ff10f 1780#ifndef USE_5005THREADS /* don't risk potential race */
1d7c1841 1781 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1782 /* safe to reuse old SV */
1d7c1841 1783 sv_setsv(*itersvp, cur);
eaa5c2d6 1784 }
1c846c1f 1785 else
eaa5c2d6
GA
1786#endif
1787 {
1788 /* we need a fresh SV every time so that loop body sees a
1789 * completely new SV for closures/references to work as
1790 * they used to */
1d7c1841
GS
1791 SvREFCNT_dec(*itersvp);
1792 *itersvp = newSVsv(cur);
eaa5c2d6 1793 }
89ea2908
GA
1794 if (strEQ(SvPVX(cur), max))
1795 sv_setiv(cur, 0); /* terminate next time */
1796 else
1797 sv_inc(cur);
1798 RETPUSHYES;
1799 }
1800 RETPUSHNO;
1801 }
1802 /* integer increment */
1803 if (cx->blk_loop.iterix > cx->blk_loop.itermax)
1804 RETPUSHNO;
7f61b687 1805
4d1ff10f 1806#ifndef USE_5005THREADS /* don't risk potential race */
1d7c1841 1807 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1808 /* safe to reuse old SV */
1d7c1841 1809 sv_setiv(*itersvp, cx->blk_loop.iterix++);
eaa5c2d6 1810 }
1c846c1f 1811 else
eaa5c2d6
GA
1812#endif
1813 {
1814 /* we need a fresh SV every time so that loop body sees a
1815 * completely new SV for closures/references to work as they
1816 * used to */
1d7c1841
GS
1817 SvREFCNT_dec(*itersvp);
1818 *itersvp = newSViv(cx->blk_loop.iterix++);
eaa5c2d6 1819 }
89ea2908
GA
1820 RETPUSHYES;
1821 }
1822
1823 /* iterate array */
3280af22 1824 if (cx->blk_loop.iterix >= (av == PL_curstack ? cx->blk_oldsp : AvFILL(av)))
4633a7c4 1825 RETPUSHNO;
a0d0e21e 1826
1d7c1841 1827 SvREFCNT_dec(*itersvp);
a0d0e21e 1828
d42935ef
JH
1829 if (SvMAGICAL(av) || AvREIFY(av)) {
1830 SV **svp = av_fetch(av, ++cx->blk_loop.iterix, FALSE);
1831 if (svp)
1832 sv = *svp;
1833 else
1834 sv = Nullsv;
1835 }
1836 else {
1837 sv = AvARRAY(av)[++cx->blk_loop.iterix];
1838 }
1839 if (sv)
a0d0e21e 1840 SvTEMP_off(sv);
a0d0e21e 1841 else
3280af22 1842 sv = &PL_sv_undef;
8b530633 1843 if (av != PL_curstack && sv == &PL_sv_undef) {
5f05dabc 1844 SV *lv = cx->blk_loop.iterlval;
71be2cbc
PP
1845 if (lv && SvREFCNT(lv) > 1) {
1846 SvREFCNT_dec(lv);
1847 lv = Nullsv;
1848 }
5f05dabc
PP
1849 if (lv)
1850 SvREFCNT_dec(LvTARG(lv));
1851 else {
68dc0745 1852 lv = cx->blk_loop.iterlval = NEWSV(26, 0);
5f05dabc 1853 sv_upgrade(lv, SVt_PVLV);
5f05dabc 1854 LvTYPE(lv) = 'y';
14befaf4 1855 sv_magic(lv, Nullsv, PERL_MAGIC_defelem, Nullch, 0);
5f05dabc
PP
1856 }
1857 LvTARG(lv) = SvREFCNT_inc(av);
1858 LvTARGOFF(lv) = cx->blk_loop.iterix;
42718184 1859 LvTARGLEN(lv) = (STRLEN)UV_MAX;
5f05dabc
PP
1860 sv = (SV*)lv;
1861 }
a0d0e21e 1862
1d7c1841 1863 *itersvp = SvREFCNT_inc(sv);
a0d0e21e
LW
1864 RETPUSHYES;
1865}
1866
1867PP(pp_subst)
1868{
39644a26 1869 dSP; dTARG;
a0d0e21e
LW
1870 register PMOP *pm = cPMOP;
1871 PMOP *rpm = pm;
1872 register SV *dstr;
1873 register char *s;
1874 char *strend;
1875 register char *m;
1876 char *c;
1877 register char *d;
1878 STRLEN clen;
1879 I32 iters = 0;
1880 I32 maxiters;
1881 register I32 i;
1882 bool once;
71be2cbc 1883 bool rxtainted;
a0d0e21e 1884 char *orig;
22e551b9 1885 I32 r_flags;
aaa362c4 1886 register REGEXP *rx = PM_GETRE(pm);
a0d0e21e
LW
1887 STRLEN len;
1888 int force_on_match = 0;
3280af22 1889 I32 oldsave = PL_savestack_ix;
792b2c16 1890 STRLEN slen;
a0d0e21e 1891
5cd24f17
PP
1892 /* known replacement string? */
1893 dstr = (pm->op_pmflags & PMf_CONST) ? POPs : Nullsv;
533c011a 1894 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e
LW
1895 TARG = POPs;
1896 else {
54b9620d 1897 TARG = DEFSV;
a0d0e21e 1898 EXTEND(SP,1);
1c846c1f 1899 }
d9f424b2 1900
eca06228
NIS
1901 if (SvFAKE(TARG) && SvREADONLY(TARG))
1902 sv_force_normal(TARG);
68dc0745
PP
1903 if (SvREADONLY(TARG)
1904 || (SvTYPE(TARG) > SVt_PVLV
1905 && !(SvTYPE(TARG) == SVt_PVGV && SvFAKE(TARG))))
d470f89e 1906 DIE(aTHX_ PL_no_modify);
8ec5e241
NIS
1907 PUTBACK;
1908
a0d0e21e 1909 s = SvPV(TARG, len);
68dc0745 1910 if (!SvPOKp(TARG) || SvTYPE(TARG) == SVt_PVGV)
a0d0e21e 1911 force_on_match = 1;
b3eb6a9b 1912 rxtainted = ((pm->op_pmdynflags & PMdf_TAINTED) ||
3280af22
NIS
1913 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
1914 if (PL_tainted)
b3eb6a9b 1915 rxtainted |= 2;
9212bbba 1916 TAINT_NOT;
a12c0f56 1917
53c4c00c 1918 PL_reg_match_utf8 = DO_UTF8(TARG);
d9f424b2 1919
a0d0e21e
LW
1920 force_it:
1921 if (!pm || !s)
2269b42e 1922 DIE(aTHX_ "panic: pp_subst");
a0d0e21e
LW
1923
1924 strend = s + len;
53c4c00c 1925 slen = PL_reg_match_utf8 ? utf8_length((U8*)s, (U8*)strend) : len;
792b2c16
JH
1926 maxiters = 2 * slen + 10; /* We can match twice at each
1927 position, once with zero-length,
1928 second time with non-zero. */
a0d0e21e 1929
3280af22
NIS
1930 if (!rx->prelen && PL_curpm) {
1931 pm = PL_curpm;
aaa362c4 1932 rx = PM_GETRE(pm);
a0d0e21e 1933 }
22e551b9 1934 r_flags = (rx->nparens || SvTEMP(TARG) || PL_sawampersand)
9d080a66 1935 ? REXEC_COPY_STR : 0;
f722798b 1936 if (SvSCREAM(TARG))
22e551b9 1937 r_flags |= REXEC_SCREAM;
a0d0e21e 1938 if (pm->op_pmflags & (PMf_MULTILINE|PMf_SINGLELINE)) {
3280af22
NIS
1939 SAVEINT(PL_multiline);
1940 PL_multiline = pm->op_pmflags & PMf_MULTILINE;
a0d0e21e
LW
1941 }
1942 orig = m = s;
f722798b 1943 if (rx->reganch & RE_USE_INTUIT) {
ee0b7718 1944 PL_bostr = orig;
f722798b
IZ
1945 s = CALLREG_INTUIT_START(aTHX_ rx, TARG, s, strend, r_flags, NULL);
1946
1947 if (!s)
1948 goto nope;
1949 /* How to do it in subst? */
1950/* if ( (rx->reganch & ROPT_CHECK_ALL)
1c846c1f 1951 && !PL_sawampersand
f722798b
IZ
1952 && ((rx->reganch & ROPT_NOSCAN)
1953 || !((rx->reganch & RE_INTUIT_TAIL)
1954 && (r_flags & REXEC_SCREAM))))
1955 goto yup;
1956*/
a0d0e21e 1957 }
71be2cbc
PP
1958
1959 /* only replace once? */
a0d0e21e 1960 once = !(rpm->op_pmflags & PMf_GLOBAL);
71be2cbc
PP
1961
1962 /* known replacement string? */
5cd24f17 1963 c = dstr ? SvPV(dstr, clen) : Nullch;
71be2cbc
PP
1964
1965 /* can do inplace substitution? */
22e551b9 1966 if (c && clen <= rx->minlen && (once || !(r_flags & REXEC_COPY_STR))
d9f97599 1967 && !(rx->reganch & ROPT_LOOKBEHIND_SEEN)) {
f722798b
IZ
1968 if (!CALLREGEXEC(aTHX_ rx, s, strend, orig, 0, TARG, NULL,
1969 r_flags | REXEC_CHECKED))
1970 {
8ec5e241 1971 SPAGAIN;
3280af22 1972 PUSHs(&PL_sv_no);
71be2cbc
PP
1973 LEAVE_SCOPE(oldsave);
1974 RETURN;
1975 }
1976 if (force_on_match) {
1977 force_on_match = 0;
1978 s = SvPV_force(TARG, len);
1979 goto force_it;
1980 }
71be2cbc 1981 d = s;
3280af22 1982 PL_curpm = pm;
71be2cbc
PP
1983 SvSCREAM_off(TARG); /* disable possible screamer */
1984 if (once) {
48c036b1 1985 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d
IZ
1986 m = orig + rx->startp[0];
1987 d = orig + rx->endp[0];
71be2cbc
PP
1988 s = orig;
1989 if (m - s > strend - d) { /* faster to shorten from end */
1990 if (clen) {
1991 Copy(c, m, clen, char);
1992 m += clen;
a0d0e21e 1993 }
71be2cbc
PP
1994 i = strend - d;
1995 if (i > 0) {
1996 Move(d, m, i, char);
1997 m += i;
a0d0e21e 1998 }
71be2cbc
PP
1999 *m = '\0';
2000 SvCUR_set(TARG, m - s);
2001 }
2002 /*SUPPRESS 560*/
155aba94 2003 else if ((i = m - s)) { /* faster from front */
71be2cbc
PP
2004 d -= clen;
2005 m = d;
2006 sv_chop(TARG, d-i);
2007 s += i;
2008 while (i--)
2009 *--d = *--s;
2010 if (clen)
2011 Copy(c, m, clen, char);
2012 }
2013 else if (clen) {
2014 d -= clen;
2015 sv_chop(TARG, d);
2016 Copy(c, d, clen, char);
2017 }
2018 else {
2019 sv_chop(TARG, d);
2020 }
48c036b1 2021 TAINT_IF(rxtainted & 1);
8ec5e241 2022 SPAGAIN;
3280af22 2023 PUSHs(&PL_sv_yes);
71be2cbc
PP
2024 }
2025 else {
71be2cbc
PP
2026 do {
2027 if (iters++ > maxiters)
cea2e8a9 2028 DIE(aTHX_ "Substitution loop");
d9f97599 2029 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d 2030 m = rx->startp[0] + orig;
71be2cbc 2031 /*SUPPRESS 560*/
155aba94 2032 if ((i = m - s)) {
71be2cbc
PP
2033 if (s != d)
2034 Move(s, d, i, char);
2035 d += i;
a0d0e21e 2036 }
71be2cbc
PP
2037 if (clen) {
2038 Copy(c, d, clen, char);
2039 d += clen;
2040 }
cf93c79d 2041 s = rx->endp[0] + orig;
cea2e8a9 2042 } while (CALLREGEXEC(aTHX_ rx, s, strend, orig, s == m,
f722798b
IZ
2043 TARG, NULL,
2044 /* don't match same null twice */
2045 REXEC_NOT_FIRST|REXEC_IGNOREPOS));
71be2cbc
PP
2046 if (s != d) {
2047 i = strend - s;
2048 SvCUR_set(TARG, d - SvPVX(TARG) + i);
2049 Move(s, d, i+1, char); /* include the NUL */
a0d0e21e 2050 }
48c036b1 2051 TAINT_IF(rxtainted & 1);
8ec5e241 2052 SPAGAIN;
71be2cbc 2053 PUSHs(sv_2mortal(newSViv((I32)iters)));
a0d0e21e 2054 }
80b498e0 2055 (void)SvPOK_only_UTF8(TARG);
48c036b1 2056 TAINT_IF(rxtainted);
8ec5e241
NIS
2057 if (SvSMAGICAL(TARG)) {
2058 PUTBACK;
2059 mg_set(TARG);
2060 SPAGAIN;
2061 }
9212bbba 2062 SvTAINT(TARG);
71be2cbc
PP
2063 LEAVE_SCOPE(oldsave);
2064 RETURN;
a0d0e21e 2065 }
71be2cbc 2066
f722798b
IZ
2067 if (CALLREGEXEC(aTHX_ rx, s, strend, orig, 0, TARG, NULL,
2068 r_flags | REXEC_CHECKED))
2069 {
60aeb6fd
NIS
2070 bool isutf8;
2071
a0d0e21e
LW
2072 if (force_on_match) {
2073 force_on_match = 0;
2074 s = SvPV_force(TARG, len);
2075 goto force_it;
2076 }
48c036b1 2077 rxtainted |= RX_MATCH_TAINTED(rx);
8ec5e241 2078 dstr = NEWSV(25, len);
a0d0e21e 2079 sv_setpvn(dstr, m, s-m);
ffc61ed2
JH
2080 if (DO_UTF8(TARG))
2081 SvUTF8_on(dstr);
3280af22 2082 PL_curpm = pm;
a0d0e21e 2083 if (!c) {
c09156bb 2084 register PERL_CONTEXT *cx;
8ec5e241 2085 SPAGAIN;
a0d0e21e
LW
2086 PUSHSUBST(cx);
2087 RETURNOP(cPMOP->op_pmreplroot);
2088 }
cf93c79d 2089 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
2090 do {
2091 if (iters++ > maxiters)
cea2e8a9 2092 DIE(aTHX_ "Substitution loop");
d9f97599 2093 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d 2094 if (RX_MATCH_COPIED(rx) && rx->subbeg != orig) {
a0d0e21e
LW
2095 m = s;
2096 s = orig;
cf93c79d 2097 orig = rx->subbeg;
a0d0e21e
LW
2098 s = orig + (m - s);
2099 strend = s + (strend - m);
2100 }
cf93c79d 2101 m = rx->startp[0] + orig;
a0d0e21e 2102 sv_catpvn(dstr, s, m-s);
cf93c79d 2103 s = rx->endp[0] + orig;
a0d0e21e
LW
2104 if (clen)
2105 sv_catpvn(dstr, c, clen);
2106 if (once)
2107 break;
ffc61ed2
JH
2108 } while (CALLREGEXEC(aTHX_ rx, s, strend, orig, s == m,
2109 TARG, NULL, r_flags));
a0d0e21e 2110 sv_catpvn(dstr, s, strend - s);
748a9306 2111
4633a7c4 2112 (void)SvOOK_off(TARG);
cb0b1708 2113 Safefree(SvPVX(TARG));
748a9306
LW
2114 SvPVX(TARG) = SvPVX(dstr);
2115 SvCUR_set(TARG, SvCUR(dstr));
2116 SvLEN_set(TARG, SvLEN(dstr));
60aeb6fd 2117 isutf8 = DO_UTF8(dstr);
748a9306
LW
2118 SvPVX(dstr) = 0;
2119 sv_free(dstr);
2120
48c036b1 2121 TAINT_IF(rxtainted & 1);
f878fbec 2122 SPAGAIN;
48c036b1
GS
2123 PUSHs(sv_2mortal(newSViv((I32)iters)));
2124
a0d0e21e 2125 (void)SvPOK_only(TARG);
60aeb6fd
NIS
2126 if (isutf8)
2127 SvUTF8_on(TARG);
48c036b1 2128 TAINT_IF(rxtainted);
a0d0e21e 2129 SvSETMAGIC(TARG);
9212bbba 2130 SvTAINT(TARG);
4633a7c4 2131 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2132 RETURN;
2133 }
5cd24f17 2134 goto ret_no;
a0d0e21e
LW
2135
2136nope:
1c846c1f 2137ret_no:
8ec5e241 2138 SPAGAIN;
3280af22 2139 PUSHs(&PL_sv_no);
4633a7c4 2140 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2141 RETURN;
2142}
2143
2144PP(pp_grepwhile)
2145{
39644a26 2146 dSP;
a0d0e21e
LW
2147
2148 if (SvTRUEx(POPs))
3280af22
NIS
2149 PL_stack_base[PL_markstack_ptr[-1]++] = PL_stack_base[*PL_markstack_ptr];
2150 ++*PL_markstack_ptr;
a0d0e21e
LW
2151 LEAVE; /* exit inner scope */
2152
2153 /* All done yet? */
3280af22 2154 if (PL_stack_base + *PL_markstack_ptr > SP) {
a0d0e21e 2155 I32 items;
54310121 2156 I32 gimme = GIMME_V;
a0d0e21e
LW
2157
2158 LEAVE; /* exit outer scope */
2159 (void)POPMARK; /* pop src */
3280af22 2160 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 2161 (void)POPMARK; /* pop dst */
3280af22 2162 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 2163 if (gimme == G_SCALAR) {
a0d0e21e
LW
2164 dTARGET;
2165 XPUSHi(items);
a0d0e21e 2166 }
54310121
PP
2167 else if (gimme == G_ARRAY)
2168 SP += items;
a0d0e21e
LW
2169 RETURN;
2170 }
2171 else {
2172 SV *src;
2173
2174 ENTER; /* enter inner scope */
1d7c1841 2175 SAVEVPTR(PL_curpm);
a0d0e21e 2176
3280af22 2177 src = PL_stack_base[*PL_markstack_ptr];
a0d0e21e 2178 SvTEMP_off(src);
54b9620d 2179 DEFSV = src;
a0d0e21e
LW
2180
2181 RETURNOP(cLOGOP->op_other);
2182 }
2183}
2184
2185PP(pp_leavesub)
2186{
39644a26 2187 dSP;
a0d0e21e
LW
2188 SV **mark;
2189 SV **newsp;
2190 PMOP *newpm;
2191 I32 gimme;
c09156bb 2192 register PERL_CONTEXT *cx;
b0d9ce38 2193 SV *sv;
a0d0e21e
LW
2194
2195 POPBLOCK(cx,newpm);
1c846c1f 2196
a1f49e72 2197 TAINT_NOT;
a0d0e21e
LW
2198 if (gimme == G_SCALAR) {
2199 MARK = newsp + 1;
a29cdaf0 2200 if (MARK <= SP) {
a8bba7fa 2201 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
a29cdaf0
IZ
2202 if (SvTEMP(TOPs)) {
2203 *MARK = SvREFCNT_inc(TOPs);
2204 FREETMPS;
2205 sv_2mortal(*MARK);
cd06dffe
GS
2206 }
2207 else {
959e3673 2208 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
a29cdaf0 2209 FREETMPS;
959e3673
GS
2210 *MARK = sv_mortalcopy(sv);
2211 SvREFCNT_dec(sv);
a29cdaf0 2212 }
cd06dffe
GS
2213 }
2214 else
a29cdaf0 2215 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
cd06dffe
GS
2216 }
2217 else {
f86702cc 2218 MEXTEND(MARK, 0);
3280af22 2219 *MARK = &PL_sv_undef;
a0d0e21e
LW
2220 }
2221 SP = MARK;
2222 }
54310121 2223 else if (gimme == G_ARRAY) {
f86702cc 2224 for (MARK = newsp + 1; MARK <= SP; MARK++) {
a1f49e72 2225 if (!SvTEMP(*MARK)) {
f86702cc 2226 *MARK = sv_mortalcopy(*MARK);
a1f49e72
CS
2227 TAINT_NOT; /* Each item is independent */
2228 }
f86702cc 2229 }
a0d0e21e 2230 }
f86702cc 2231 PUTBACK;
1c846c1f 2232
b0d9ce38 2233 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
3280af22 2234 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e
LW
2235
2236 LEAVE;
b0d9ce38 2237 LEAVESUB(sv);
a0d0e21e
LW
2238 return pop_return();
2239}
2240
cd06dffe
GS
2241/* This duplicates the above code because the above code must not
2242 * get any slower by more conditions */
2243PP(pp_leavesublv)
2244{
39644a26 2245 dSP;
cd06dffe
GS
2246 SV **mark;
2247 SV **newsp;
2248 PMOP *newpm;
2249 I32 gimme;
2250 register PERL_CONTEXT *cx;
b0d9ce38 2251 SV *sv;
cd06dffe
GS
2252
2253 POPBLOCK(cx,newpm);
1c846c1f 2254
cd06dffe
GS
2255 TAINT_NOT;
2256
2257 if (cx->blk_sub.lval & OPpENTERSUB_INARGS) {
2258 /* We are an argument to a function or grep().
2259 * This kind of lvalueness was legal before lvalue
2260 * subroutines too, so be backward compatible:
2261 * cannot report errors. */
2262
2263 /* Scalar context *is* possible, on the LHS of -> only,
2264 * as in f()->meth(). But this is not an lvalue. */
2265 if (gimme == G_SCALAR)
2266 goto temporise;
2267 if (gimme == G_ARRAY) {
a8bba7fa 2268 if (!CvLVALUE(cx->blk_sub.cv))
cd06dffe
GS
2269 goto temporise_array;
2270 EXTEND_MORTAL(SP - newsp);
2271 for (mark = newsp + 1; mark <= SP; mark++) {
2272 if (SvTEMP(*mark))
2273 /* empty */ ;
2274 else if (SvFLAGS(*mark) & (SVs_PADTMP | SVf_READONLY))
2275 *mark = sv_mortalcopy(*mark);
2276 else {
2277 /* Can be a localized value subject to deletion. */
2278 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2279 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2280 }
2281 }
2282 }
2283 }
2284 else if (cx->blk_sub.lval) { /* Leave it as it is if we can. */
2285 /* Here we go for robustness, not for speed, so we change all
2286 * the refcounts so the caller gets a live guy. Cannot set
2287 * TEMP, so sv_2mortal is out of question. */
a8bba7fa 2288 if (!CvLVALUE(cx->blk_sub.cv)) {
b0d9ce38 2289 POPSUB(cx,sv);
d470f89e 2290 PL_curpm = newpm;
b0d9ce38
GS
2291 LEAVE;
2292 LEAVESUB(sv);
d470f89e
GS
2293 DIE(aTHX_ "Can't modify non-lvalue subroutine call");
2294 }
cd06dffe
GS
2295 if (gimme == G_SCALAR) {
2296 MARK = newsp + 1;
2297 EXTEND_MORTAL(1);
2298 if (MARK == SP) {
d470f89e 2299 if (SvFLAGS(TOPs) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
b0d9ce38 2300 POPSUB(cx,sv);
d470f89e 2301 PL_curpm = newpm;
b0d9ce38
GS
2302 LEAVE;
2303 LEAVESUB(sv);
d470f89e 2304 DIE(aTHX_ "Can't return a %s from lvalue subroutine",
cd06dffe 2305 SvREADONLY(TOPs) ? "readonly value" : "temporary");
d470f89e 2306 }
cd06dffe
GS
2307 else { /* Can be a localized value
2308 * subject to deletion. */
2309 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2310 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2311 }
2312 }
d470f89e 2313 else { /* Should not happen? */
b0d9ce38 2314 POPSUB(cx,sv);
d470f89e 2315 PL_curpm = newpm;
b0d9ce38
GS
2316 LEAVE;
2317 LEAVESUB(sv);
d470f89e 2318 DIE(aTHX_ "%s returned from lvalue subroutine in scalar context",
cd06dffe 2319 (MARK > SP ? "Empty array" : "Array"));
d470f89e 2320 }
cd06dffe
GS
2321 SP = MARK;
2322 }
2323 else if (gimme == G_ARRAY) {
2324 EXTEND_MORTAL(SP - newsp);
2325 for (mark = newsp + 1; mark <= SP; mark++) {
f206cdda
AMS
2326 if (*mark != &PL_sv_undef
2327 && SvFLAGS(*mark) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
d470f89e
GS
2328 /* Might be flattened array after $#array = */
2329 PUTBACK;
b0d9ce38 2330 POPSUB(cx,sv);
d470f89e 2331 PL_curpm = newpm;
b0d9ce38
GS
2332 LEAVE;
2333 LEAVESUB(sv);
f206cdda
AMS
2334 DIE(aTHX_ "Can't return a %s from lvalue subroutine",
2335 SvREADONLY(TOPs) ? "readonly value" : "temporary");
d470f89e 2336 }
cd06dffe 2337 else {
cd06dffe
GS
2338 /* Can be a localized value subject to deletion. */
2339 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2340 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2341 }
2342 }
2343 }
2344 }
2345 else {
2346 if (gimme == G_SCALAR) {
2347 temporise:
2348 MARK = newsp + 1;
2349 if (MARK <= SP) {
a8bba7fa 2350 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
cd06dffe
GS
2351 if (SvTEMP(TOPs)) {
2352 *MARK = SvREFCNT_inc(TOPs);
2353 FREETMPS;
2354 sv_2mortal(*MARK);
2355 }
2356 else {
959e3673 2357 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
cd06dffe 2358 FREETMPS;
959e3673
GS
2359 *MARK = sv_mortalcopy(sv);
2360 SvREFCNT_dec(sv);
cd06dffe
GS
2361 }
2362 }
2363 else
2364 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
2365 }
2366 else {
2367 MEXTEND(MARK, 0);
2368 *MARK = &PL_sv_undef;
2369 }
2370 SP = MARK;
2371 }
2372 else if (gimme == G_ARRAY) {
2373 temporise_array:
2374 for (MARK = newsp + 1; MARK <= SP; MARK++) {
2375 if (!SvTEMP(*MARK)) {
2376 *MARK = sv_mortalcopy(*MARK);
2377 TAINT_NOT; /* Each item is independent */
2378 }
2379 }
2380 }
2381 }
2382 PUTBACK;
1c846c1f 2383
b0d9ce38 2384 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
cd06dffe
GS
2385 PL_curpm = newpm; /* ... and pop $1 et al */
2386
2387 LEAVE;
b0d9ce38 2388 LEAVESUB(sv);
cd06dffe
GS
2389 return pop_return();
2390}
2391
2392
76e3520e 2393STATIC CV *
cea2e8a9 2394S_get_db_sub(pTHX_ SV **svp, CV *cv)
3de9ffa1 2395{
3280af22 2396 SV *dbsv = GvSV(PL_DBsub);
491527d0
GS
2397
2398 if (!PERLDB_SUB_NN) {
2399 GV *gv = CvGV(cv);
2400
2401 save_item(dbsv);
2402 if ( (CvFLAGS(cv) & (CVf_ANON | CVf_CLONED))
1c846c1f 2403 || strEQ(GvNAME(gv), "END")
491527d0
GS
2404 || ((GvCV(gv) != cv) && /* Could be imported, and old sub redefined. */
2405 !( (SvTYPE(*svp) == SVt_PVGV) && (GvCV((GV*)*svp) == cv)
2406 && (gv = (GV*)*svp) ))) {
2407 /* Use GV from the stack as a fallback. */
2408 /* GV is potentially non-unique, or contain different CV. */
c2e66d9e
GS
2409 SV *tmp = newRV((SV*)cv);
2410 sv_setsv(dbsv, tmp);
2411 SvREFCNT_dec(tmp);
491527d0
GS
2412 }
2413 else {
2414 gv_efullname3(dbsv, gv, Nullch);
2415 }
3de9ffa1
MB
2416 }
2417 else {
155aba94
GS
2418 (void)SvUPGRADE(dbsv, SVt_PVIV);
2419 (void)SvIOK_on(dbsv);
491527d0 2420 SAVEIV(SvIVX(dbsv));
5bc28da9 2421 SvIVX(dbsv) = PTR2IV(cv); /* Do it the quickest way */
3de9ffa1 2422 }
491527d0 2423
3de9ffa1 2424 if (CvXSUB(cv))
3280af22
NIS
2425 PL_curcopdb = PL_curcop;
2426 cv = GvCV(PL_DBsub);
3de9ffa1
MB
2427 return cv;
2428}
2429
a0d0e21e
LW
2430PP(pp_entersub)
2431{
39644a26 2432 dSP; dPOPss;
a0d0e21e
LW
2433 GV *gv;
2434 HV *stash;
2435 register CV *cv;
c09156bb 2436 register PERL_CONTEXT *cx;
5d94fbed 2437 I32 gimme;
533c011a 2438 bool hasargs = (PL_op->op_flags & OPf_STACKED) != 0;
a0d0e21e
LW
2439
2440 if (!sv)
cea2e8a9 2441 DIE(aTHX_ "Not a CODE reference");
a0d0e21e
LW
2442 switch (SvTYPE(sv)) {
2443 default:
2444 if (!SvROK(sv)) {
748a9306 2445 char *sym;
2d8e6c8d 2446 STRLEN n_a;
748a9306 2447
3280af22 2448 if (sv == &PL_sv_yes) { /* unfound import, ignore */
fb73857a 2449 if (hasargs)
3280af22 2450 SP = PL_stack_base + POPMARK;
a0d0e21e 2451 RETURN;
fb73857a 2452 }
15ff848f
CS
2453 if (SvGMAGICAL(sv)) {
2454 mg_get(sv);
f5f1d18e
AMS
2455 if (SvROK(sv))
2456 goto got_rv;
15ff848f
CS
2457 sym = SvPOKp(sv) ? SvPVX(sv) : Nullch;
2458 }
2459 else
2d8e6c8d 2460 sym = SvPV(sv, n_a);
15ff848f 2461 if (!sym)
cea2e8a9 2462 DIE(aTHX_ PL_no_usym, "a subroutine");
533c011a 2463 if (PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 2464 DIE(aTHX_ PL_no_symref, sym, "a subroutine");
864dbfa3 2465 cv = get_cv(sym, TRUE);
a0d0e21e
LW
2466 break;
2467 }
f5f1d18e 2468 got_rv:
f5284f61
IZ
2469 {
2470 SV **sp = &sv; /* Used in tryAMAGICunDEREF macro. */
2471 tryAMAGICunDEREF(to_cv);
2472 }
a0d0e21e
LW
2473 cv = (CV*)SvRV(sv);
2474 if (SvTYPE(cv) == SVt_PVCV)
2475 break;
2476 /* FALL THROUGH */
2477 case SVt_PVHV:
2478 case SVt_PVAV:
cea2e8a9 2479 DIE(aTHX_ "Not a CODE reference");
a0d0e21e
LW
2480 case SVt_PVCV:
2481 cv = (CV*)sv;
2482 break;
2483 case SVt_PVGV:
8ebc5c01 2484 if (!(cv = GvCVu((GV*)sv)))
f6ec51f7
GS
2485 cv = sv_2cv(sv, &stash, &gv, FALSE);
2486 if (!cv) {
2487 ENTER;
2488 SAVETMPS;
2489 goto try_autoload;
2490 }
2491 break;
a0d0e21e
LW
2492 }
2493
2494 ENTER;
2495 SAVETMPS;
2496
2497 retry:
a0d0e21e 2498 if (!CvROOT(cv) && !CvXSUB(cv)) {
44a8e56a 2499 GV* autogv;
22239a37 2500 SV* sub_name;
44a8e56a
PP
2501
2502 /* anonymous or undef'd function leaves us no recourse */
2503 if (CvANON(cv) || !(gv = CvGV(cv)))
cea2e8a9 2504 DIE(aTHX_ "Undefined subroutine called");
67caa1fe 2505
44a8e56a
PP
2506 /* autoloaded stub? */
2507 if (cv != GvCV(gv)) {
2508 cv = GvCV(gv);
a0d0e21e 2509 }
44a8e56a 2510 /* should call AUTOLOAD now? */
67caa1fe 2511 else {
f6ec51f7
GS
2512try_autoload:
2513 if ((autogv = gv_autoload4(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv),
2514 FALSE)))
2515 {
2516 cv = GvCV(autogv);
2517 }
2518 /* sorry */
2519 else {
2520 sub_name = sv_newmortal();
2521 gv_efullname3(sub_name, gv, Nullch);
cea2e8a9 2522 DIE(aTHX_ "Undefined subroutine &%s called", SvPVX(sub_name));
f6ec51f7 2523 }
67caa1fe
GS
2524 }
2525 if (!cv)
cea2e8a9 2526 DIE(aTHX_ "Not a CODE reference");
67caa1fe 2527 goto retry;
a0d0e21e
LW
2528 }
2529
54310121 2530 gimme = GIMME_V;
67caa1fe 2531 if ((PL_op->op_private & OPpENTERSUB_DB) && GvCV(PL_DBsub) && !CvNODEBUG(cv)) {
4f01c5a5 2532 cv = get_db_sub(&sv, cv);
67caa1fe 2533 if (!cv)
cea2e8a9 2534 DIE(aTHX_ "No DBsub routine");
67caa1fe 2535 }
a0d0e21e 2536
4d1ff10f 2537#ifdef USE_5005THREADS
3de9ffa1
MB
2538 /*
2539 * First we need to check if the sub or method requires locking.
458fb581
MB
2540 * If so, we gain a lock on the CV, the first argument or the
2541 * stash (for static methods), as appropriate. This has to be
2542 * inline because for FAKE_THREADS, COND_WAIT inlines code to
2543 * reschedule by returning a new op.
3de9ffa1 2544 */
11343788 2545 MUTEX_LOCK(CvMUTEXP(cv));
77a005ab
MB
2546 if (CvFLAGS(cv) & CVf_LOCKED) {
2547 MAGIC *mg;
2548 if (CvFLAGS(cv) & CVf_METHOD) {
533c011a
NIS
2549 if (SP > PL_stack_base + TOPMARK)
2550 sv = *(PL_stack_base + TOPMARK + 1);
77a005ab 2551 else {
13e08037
GS
2552 AV *av = (AV*)PL_curpad[0];
2553 if (hasargs || !av || AvFILLp(av) < 0
2554 || !(sv = AvARRAY(av)[0]))
2555 {
2556 MUTEX_UNLOCK(CvMUTEXP(cv));
d470f89e 2557 DIE(aTHX_ "no argument for locked method call");
13e08037 2558 }
77a005ab
MB
2559 }
2560 if (SvROK(sv))
2561 sv = SvRV(sv);
458fb581
MB
2562 else {
2563 STRLEN len;
2564 char *stashname = SvPV(sv, len);
2565 sv = (SV*)gv_stashpvn(stashname, len, TRUE);
2566 }
77a005ab
MB
2567 }
2568 else {
2569 sv = (SV*)cv;
2570 }
2571 MUTEX_UNLOCK(CvMUTEXP(cv));
2572 mg = condpair_magic(sv);
2573 MUTEX_LOCK(MgMUTEXP(mg));
2574 if (MgOWNER(mg) == thr)
2575 MUTEX_UNLOCK(MgMUTEXP(mg));
2576 else {
2577 while (MgOWNER(mg))
2578 COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
2579 MgOWNER(mg) = thr;
bf49b057 2580 DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: pp_entersub lock %p\n",
a674cc95 2581 thr, sv));
77a005ab 2582 MUTEX_UNLOCK(MgMUTEXP(mg));
c76ac1ee 2583 SAVEDESTRUCTOR_X(Perl_unlock_condpair, sv);
11343788 2584 }
77a005ab 2585 MUTEX_LOCK(CvMUTEXP(cv));
11343788 2586 }
3de9ffa1
MB
2587 /*
2588 * Now we have permission to enter the sub, we must distinguish
2589 * four cases. (0) It's an XSUB (in which case we don't care
2590 * about ownership); (1) it's ours already (and we're recursing);
2591 * (2) it's free (but we may already be using a cached clone);
2592 * (3) another thread owns it. Case (1) is easy: we just use it.
2593 * Case (2) means we look for a clone--if we have one, use it
2594 * otherwise grab ownership of cv. Case (3) means we look for a
2595 * clone (for non-XSUBs) and have to create one if we don't
2596 * already have one.
2597 * Why look for a clone in case (2) when we could just grab
2598 * ownership of cv straight away? Well, we could be recursing,
2599 * i.e. we originally tried to enter cv while another thread
2600 * owned it (hence we used a clone) but it has been freed up
2601 * and we're now recursing into it. It may or may not be "better"
2602 * to use the clone but at least CvDEPTH can be trusted.
2603 */
2604 if (CvOWNER(cv) == thr || CvXSUB(cv))
2605 MUTEX_UNLOCK(CvMUTEXP(cv));
11343788 2606 else {
3de9ffa1
MB
2607 /* Case (2) or (3) */
2608 SV **svp;
2609
11343788 2610 /*
3de9ffa1
MB
2611 * XXX Might it be better to release CvMUTEXP(cv) while we
2612 * do the hv_fetch? We might find someone has pinched it
2613 * when we look again, in which case we would be in case
2614 * (3) instead of (2) so we'd have to clone. Would the fact
2615 * that we released the mutex more quickly make up for this?
2616 */
b099ddc0 2617 if ((svp = hv_fetch(thr->cvcache, (char *)cv, sizeof(cv), FALSE)))
6ee623d5 2618 {
3de9ffa1 2619 /* We already have a clone to use */
11343788 2620 MUTEX_UNLOCK(CvMUTEXP(cv));
3de9ffa1 2621 cv = *(CV**)svp;
bf49b057 2622 DEBUG_S(PerlIO_printf(Perl_debug_log,
1fd28e87
MB
2623 "entersub: %p already has clone %p:%s\n",
2624 thr, cv, SvPEEK((SV*)cv)));
3de9ffa1
MB
2625 CvOWNER(cv) = thr;
2626 SvREFCNT_inc(cv);
2627 if (CvDEPTH(cv) == 0)
c76ac1ee 2628 SAVEDESTRUCTOR_X(unset_cvowner, (void*) cv);
3de9ffa1 2629 }
11343788 2630 else {
3de9ffa1
MB
2631 /* (2) => grab ownership of cv. (3) => make clone */
2632 if (!CvOWNER(cv)) {
2633 CvOWNER(cv) = thr;
2634 SvREFCNT_inc(cv);
11343788 2635 MUTEX_UNLOCK(CvMUTEXP(cv));
bf49b057 2636 DEBUG_S(PerlIO_printf(Perl_debug_log,
1fd28e87
MB
2637 "entersub: %p grabbing %p:%s in stash %s\n",
2638 thr, cv, SvPEEK((SV*)cv), CvSTASH(cv) ?
3de9ffa1 2639 HvNAME(CvSTASH(cv)) : "(none)"));
cd06dffe
GS
2640 }
2641 else {
3de9ffa1
MB
2642 /* Make a new clone. */
2643 CV *clonecv;
2644 SvREFCNT_inc(cv); /* don't let it vanish from under us */
2645 MUTEX_UNLOCK(CvMUTEXP(cv));
bf49b057 2646 DEBUG_S((PerlIO_printf(Perl_debug_log,
1fd28e87
MB
2647 "entersub: %p cloning %p:%s\n",
2648 thr, cv, SvPEEK((SV*)cv))));
3de9ffa1
MB
2649 /*
2650 * We're creating a new clone so there's no race
2651 * between the original MUTEX_UNLOCK and the
2652 * SvREFCNT_inc since no one will be trying to undef
2653 * it out from underneath us. At least, I don't think
2654 * there's a race...
2655 */
2656 clonecv = cv_clone(cv);
2657 SvREFCNT_dec(cv); /* finished with this */
199100c8 2658 hv_store(thr->cvcache, (char*)cv, sizeof(cv), (SV*)clonecv,0);
3de9ffa1
MB
2659 CvOWNER(clonecv) = thr;
2660 cv = clonecv;
11343788 2661 SvREFCNT_inc(cv);
11343788 2662 }
8b73bbec 2663 DEBUG_S(if (CvDEPTH(cv) != 0)
bf49b057 2664 PerlIO_printf(Perl_debug_log, "depth %ld != 0\n",
755b0776 2665 CvDEPTH(cv)));
c76ac1ee 2666 SAVEDESTRUCTOR_X(unset_cvowner, (void*) cv);
11343788 2667 }
3de9ffa1 2668 }
4d1ff10f 2669#endif /* USE_5005THREADS */
11343788 2670
a0d0e21e 2671 if (CvXSUB(cv)) {
67caa1fe 2672#ifdef PERL_XSUB_OLDSTYLE
a0d0e21e 2673 if (CvOLDSTYLE(cv)) {
20ce7b12 2674 I32 (*fp3)(int,int,int);
a0d0e21e
LW
2675 dMARK;
2676 register I32 items = SP - MARK;
67955e0c 2677 /* We dont worry to copy from @_. */
924508f0
GS
2678 while (SP > mark) {
2679 SP[1] = SP[0];
2680 SP--;
a0d0e21e 2681 }
3280af22 2682 PL_stack_sp = mark + 1;
1d7c1841 2683 fp3 = (I32(*)(int,int,int))CvXSUB(cv);
1c846c1f 2684 items = (*fp3)(CvXSUBANY(cv).any_i32,
3280af22 2685 MARK - PL_stack_base + 1,
ecfc5424 2686 items);
3280af22 2687 PL_stack_sp = PL_stack_base + items;
a0d0e21e 2688 }
67caa1fe
GS
2689 else
2690#endif /* PERL_XSUB_OLDSTYLE */
2691 {
748a9306
LW
2692 I32 markix = TOPMARK;
2693
a0d0e21e 2694 PUTBACK;
67955e0c
PP
2695
2696 if (!hasargs) {
2697 /* Need to copy @_ to stack. Alternative may be to
2698 * switch stack to @_, and copy return values
2699 * back. This would allow popping @_ in XSUB, e.g.. XXXX */
6d4ff0d2
MB
2700 AV* av;
2701 I32 items;
4d1ff10f 2702#ifdef USE_5005THREADS
533c011a 2703 av = (AV*)PL_curpad[0];
6d4ff0d2 2704#else
3280af22 2705 av = GvAV(PL_defgv);
4d1ff10f 2706#endif /* USE_5005THREADS */
93965878 2707 items = AvFILLp(av) + 1; /* @_ is not tieable */
67955e0c
PP
2708
2709 if (items) {
2710 /* Mark is at the end of the stack. */
924508f0
GS
2711 EXTEND(SP, items);
2712 Copy(AvARRAY(av), SP + 1, items, SV*);
2713 SP += items;
1c846c1f 2714 PUTBACK ;
67955e0c
PP
2715 }
2716 }
67caa1fe
GS
2717 /* We assume first XSUB in &DB::sub is the called one. */
2718 if (PL_curcopdb) {
1d7c1841 2719 SAVEVPTR(PL_curcop);
3280af22
NIS
2720 PL_curcop = PL_curcopdb;
2721 PL_curcopdb = NULL;
67955e0c
PP
2722 }
2723 /* Do we need to open block here? XXXX */
acfe0abc 2724 (void)(*CvXSUB(cv))(aTHX_ cv);
748a9306
LW
2725
2726 /* Enforce some sanity in scalar context. */
3280af22
NIS
2727 if (gimme == G_SCALAR && ++markix != PL_stack_sp - PL_stack_base ) {
2728 if (markix > PL_stack_sp - PL_stack_base)
2729 *(PL_stack_base + markix) = &PL_sv_undef;
748a9306 2730 else
3280af22
NIS
2731 *(PL_stack_base + markix) = *PL_stack_sp;
2732 PL_stack_sp = PL_stack_base + markix;
748a9306 2733 }
a0d0e21e
LW
2734 }
2735 LEAVE;
2736 return NORMAL;
2737 }
2738 else {
2739 dMARK;
2740 register I32 items = SP - MARK;
a0d0e21e
LW
2741 AV* padlist = CvPADLIST(cv);
2742 SV** svp = AvARRAY(padlist);
533c011a 2743 push_return(PL_op->op_next);
a0d0e21e
LW
2744 PUSHBLOCK(cx, CXt_SUB, MARK);
2745 PUSHSUB(cx);
2746 CvDEPTH(cv)++;
6b35e009
GS
2747 /* XXX This would be a natural place to set C<PL_compcv = cv> so
2748 * that eval'' ops within this sub know the correct lexical space.
2749 * Owing the speed considerations, we choose to search for the cv
2750 * in doeval() instead.
2751 */
a0d0e21e
LW
2752 if (CvDEPTH(cv) < 2)
2753 (void)SvREFCNT_inc(cv);
2754 else { /* save temporaries on recursion? */
1d7c1841 2755 PERL_STACK_OVERFLOW_CHECK();
93965878 2756 if (CvDEPTH(cv) > AvFILLp(padlist)) {
a0d0e21e
LW
2757 AV *av;
2758 AV *newpad = newAV();
4aa0a1f7 2759 SV **oldpad = AvARRAY(svp[CvDEPTH(cv)-1]);
93965878 2760 I32 ix = AvFILLp((AV*)svp[1]);
1d7c1841 2761 I32 names_fill = AvFILLp((AV*)svp[0]);
a0d0e21e 2762 svp = AvARRAY(svp[0]);
748a9306 2763 for ( ;ix > 0; ix--) {
1d7c1841 2764 if (names_fill >= ix && svp[ix] != &PL_sv_undef) {
748a9306 2765 char *name = SvPVX(svp[ix]);
5f05dabc
PP
2766 if ((SvFLAGS(svp[ix]) & SVf_FAKE) /* outer lexical? */
2767 || *name == '&') /* anonymous code? */
2768 {
2769 av_store(newpad, ix, SvREFCNT_inc(oldpad[ix]));
748a9306
LW
2770 }
2771 else { /* our own lexical */
2772 if (*name == '@')
2773 av_store(newpad, ix, sv = (SV*)newAV());
2774 else if (*name == '%')
2775 av_store(newpad, ix, sv = (SV*)newHV());
2776 else
2777 av_store(newpad, ix, sv = NEWSV(0,0));
2778 SvPADMY_on(sv);
2779 }
a0d0e21e 2780 }
1d7c1841
GS
2781 else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) {
2782 av_store(newpad, ix, sv = SvREFCNT_inc(oldpad[ix]));
2783 }
a0d0e21e 2784 else {
748a9306 2785 av_store(newpad, ix, sv = NEWSV(0,0));
a0d0e21e
LW
2786 SvPADTMP_on(sv);
2787 }
2788 }
2789 av = newAV(); /* will be @_ */
2790 av_extend(av, 0);
2791 av_store(newpad, 0, (SV*)av);
2792 AvFLAGS(av) = AVf_REIFY;
2793 av_store(padlist, CvDEPTH(cv), (SV*)newpad);
93965878 2794 AvFILLp(padlist) = CvDEPTH(cv);
a0d0e21e
LW
2795 svp = AvARRAY(padlist);
2796 }
2797 }
4d1ff10f 2798#ifdef USE_5005THREADS
6d4ff0d2 2799 if (!hasargs) {
533c011a 2800 AV* av = (AV*)PL_curpad[0];
6d4ff0d2 2801
93965878 2802 items = AvFILLp(av) + 1;
6d4ff0d2
MB
2803 if (items) {
2804 /* Mark is at the end of the stack. */
924508f0
GS
2805 EXTEND(SP, items);
2806 Copy(AvARRAY(av), SP + 1, items, SV*);
2807 SP += items;
1c846c1f 2808 PUTBACK ;
6d4ff0d2
MB
2809 }
2810 }
4d1ff10f 2811#endif /* USE_5005THREADS */
1d7c1841 2812 SAVEVPTR(PL_curpad);
3280af22 2813 PL_curpad = AvARRAY((AV*)svp[CvDEPTH(cv)]);
4d1ff10f 2814#ifndef USE_5005THREADS
6d4ff0d2 2815 if (hasargs)
4d1ff10f 2816#endif /* USE_5005THREADS */
6d4ff0d2
MB
2817 {
2818 AV* av;
a0d0e21e
LW
2819 SV** ary;
2820
77a005ab 2821#if 0
bf49b057 2822 DEBUG_S(PerlIO_printf(Perl_debug_log,
0f15f207 2823 "%p entersub preparing @_\n", thr));
77a005ab 2824#endif
3280af22 2825 av = (AV*)PL_curpad[0];
221373f0
GS
2826 if (AvREAL(av)) {
2827 /* @_ is normally not REAL--this should only ever
2828 * happen when DB::sub() calls things that modify @_ */
2829 av_clear(av);
2830 AvREAL_off(av);
2831 AvREIFY_on(av);
2832 }
4d1ff10f 2833#ifndef USE_5005THREADS
3280af22
NIS
2834 cx->blk_sub.savearray = GvAV(PL_defgv);
2835 GvAV(PL_defgv) = (AV*)SvREFCNT_inc(av);
4d1ff10f 2836#endif /* USE_5005THREADS */
7032098e 2837 cx->blk_sub.oldcurpad = PL_curpad;
6d4ff0d2 2838 cx->blk_sub.argarray = av;
a0d0e21e
LW
2839 ++MARK;
2840
2841 if (items > AvMAX(av) + 1) {
2842 ary = AvALLOC(av);
2843 if (AvARRAY(av) != ary) {
2844 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
2845 SvPVX(av) = (char*)ary;
2846 }
2847 if (items > AvMAX(av) + 1) {
2848 AvMAX(av) = items - 1;
2849 Renew(ary,items,SV*);
2850 AvALLOC(av) = ary;
2851 SvPVX(av) = (char*)ary;
2852 }
2853 }
2854 Copy(MARK,AvARRAY(av),items,SV*);
93965878 2855 AvFILLp(av) = items - 1;
1c846c1f 2856
a0d0e21e
LW
2857 while (items--) {
2858 if (*MARK)
2859 SvTEMP_off(*MARK);
2860 MARK++;
2861 }
2862 }
4a925ff6
GS
2863 /* warning must come *after* we fully set up the context
2864 * stuff so that __WARN__ handlers can safely dounwind()
2865 * if they want to
2866 */
2867 if (CvDEPTH(cv) == 100 && ckWARN(WARN_RECURSION)
2868 && !(PERLDB_SUB && cv == GvCV(PL_DBsub)))
2869 sub_crush_depth(cv);
77a005ab 2870#if 0
bf49b057 2871 DEBUG_S(PerlIO_printf(Perl_debug_log,
0f15f207 2872 "%p entersub returning %p\n", thr, CvSTART(cv)));
77a005ab 2873#endif
a0d0e21e
LW
2874 RETURNOP(CvSTART(cv));
2875 }
2876}
2877
44a8e56a 2878void
864dbfa3 2879Perl_sub_crush_depth(pTHX_ CV *cv)
44a8e56a
PP
2880{
2881 if (CvANON(cv))
cea2e8a9 2882 Perl_warner(aTHX_ WARN_RECURSION, "Deep recursion on anonymous subroutine");
44a8e56a
PP
2883 else {
2884 SV* tmpstr = sv_newmortal();
2885 gv_efullname3(tmpstr, CvGV(cv), Nullch);
1c846c1f 2886 Perl_warner(aTHX_ WARN_RECURSION, "Deep recursion on subroutine \"%s\"",
599cee73 2887 SvPVX(tmpstr));
44a8e56a
PP
2888 }
2889}
2890
a0d0e21e
LW
2891PP(pp_aelem)
2892{
39644a26 2893 dSP;
a0d0e21e 2894 SV** svp;
d804643f
SC
2895 SV* elemsv = POPs;
2896 IV elem = SvIV(elemsv);
68dc0745 2897 AV* av = (AV*)POPs;
78f9721b 2898 U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
533c011a 2899 U32 defer = (PL_op->op_private & OPpLVAL_DEFER) && (elem > AvFILL(av));
be6c24e0 2900 SV *sv;
a0d0e21e 2901
e35c1634 2902 if (SvROK(elemsv) && !SvGAMAGIC(elemsv) && ckWARN(WARN_MISC))
d804643f 2903 Perl_warner(aTHX_ WARN_MISC, "Use of reference \"%s\" as array index", SvPV_nolen(elemsv));
748a9306 2904 if (elem > 0)
3280af22 2905 elem -= PL_curcop->cop_arybase;
a0d0e21e
LW
2906 if (SvTYPE(av) != SVt_PVAV)
2907 RETPUSHUNDEF;
68dc0745 2908 svp = av_fetch(av, elem, lval && !defer);
a0d0e21e 2909 if (lval) {
3280af22 2910 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
2911 SV* lv;
2912 if (!defer)
cea2e8a9 2913 DIE(aTHX_ PL_no_aelem, elem);
68dc0745
PP
2914 lv = sv_newmortal();
2915 sv_upgrade(lv, SVt_PVLV);
2916 LvTYPE(lv) = 'y';
14befaf4 2917 sv_magic(lv, Nullsv, PERL_MAGIC_defelem, Nullch, 0);
68dc0745
PP
2918 LvTARG(lv) = SvREFCNT_inc(av);
2919 LvTARGOFF(lv) = elem;
2920 LvTARGLEN(lv) = 1;
2921 PUSHs(lv);
2922 RETURN;
2923 }
533c011a 2924 if (PL_op->op_private & OPpLVAL_INTRO)
161b7d16 2925 save_aelem(av, elem, svp);
533c011a
NIS
2926 else if (PL_op->op_private & OPpDEREF)
2927 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 2928 }
3280af22 2929 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
2930 if (!lval && SvGMAGICAL(sv)) /* see note in pp_helem() */
2931 sv = sv_mortalcopy(sv);
2932 PUSHs(sv);
a0d0e21e
LW
2933 RETURN;
2934}
2935
02a9e968 2936void
864dbfa3 2937Perl_vivify_ref(pTHX_ SV *sv, U32 to_what)
02a9e968
CS
2938{
2939 if (SvGMAGICAL(sv))
2940 mg_get(sv);
2941 if (!SvOK(sv)) {
2942 if (SvREADONLY(sv))
cea2e8a9 2943 Perl_croak(aTHX_ PL_no_modify);
5f05dabc
PP
2944 if (SvTYPE(sv) < SVt_RV)
2945 sv_upgrade(sv, SVt_RV);
2946 else if (SvTYPE(sv) >= SVt_PV) {
2947 (void)SvOOK_off(sv);
2948 Safefree(SvPVX(sv));
2949 SvLEN(sv) = SvCUR(sv) = 0;
2950 }
68dc0745 2951 switch (to_what) {
5f05dabc 2952 case OPpDEREF_SV:
8c52afec 2953 SvRV(sv) = NEWSV(355,0);
5f05dabc
PP
2954 break;
2955 case OPpDEREF_AV:
2956 SvRV(sv) = (SV*)newAV();
2957 break;
2958 case OPpDEREF_HV:
2959 SvRV(sv) = (SV*)newHV();
2960 break;
2961 }
02a9e968
CS
2962 SvROK_on(sv);
2963 SvSETMAGIC(sv);
2964 }
2965}
2966
a0d0e21e
LW
2967PP(pp_method)
2968{
39644a26 2969 dSP;
f5d5a27c
CS
2970 SV* sv = TOPs;
2971
2972 if (SvROK(sv)) {
eda383f2 2973 SV* rsv = SvRV(sv);
f5d5a27c
CS
2974 if (SvTYPE(rsv) == SVt_PVCV) {
2975 SETs(rsv);
2976 RETURN;
2977 }
2978 }
2979
2980 SETs(method_common(sv, Null(U32*)));
2981 RETURN;
2982}
2983
2984PP(pp_method_named)
2985{
39644a26 2986 dSP;
f5d5a27c
CS
2987 SV* sv = cSVOP->op_sv;
2988 U32 hash = SvUVX(sv);
2989
2990 XPUSHs(method_common(sv, &hash));
2991 RETURN;
2992}
2993
2994STATIC SV *
2995S_method_common(pTHX_ SV* meth, U32* hashp)
2996{
a0d0e21e
LW
2997 SV* sv;
2998 SV* ob;
2999 GV* gv;
56304f61
CS
3000 HV* stash;
3001 char* name;
f5d5a27c 3002 STRLEN namelen;
9c5ffd7c 3003 char* packname = 0;
ac91690f 3004 STRLEN packlen;
a0d0e21e 3005
f5d5a27c 3006 name = SvPV(meth, namelen);
3280af22 3007 sv = *(PL_stack_base + TOPMARK + 1);
f5d5a27c 3008
4f1b7578
SC
3009 if (!sv)
3010 Perl_croak(aTHX_ "Can't call method \"%s\" on an undefined value", name);
3011
16d20bd9 3012 if (SvGMAGICAL(sv))
af09ea45 3013 mg_get(sv);
a0d0e21e 3014 if (SvROK(sv))
16d20bd9 3015 ob = (SV*)SvRV(sv);
a0d0e21e
LW
3016 else {
3017 GV* iogv;
a0d0e21e 3018
af09ea45 3019 /* this isn't a reference */
56304f61 3020 packname = Nullch;
a0d0e21e 3021 if (!SvOK(sv) ||
56304f61 3022 !(packname = SvPV(sv, packlen)) ||
a0d0e21e
LW
3023 !(iogv = gv_fetchpv(packname, FALSE, SVt_PVIO)) ||
3024 !(ob=(SV*)GvIO(iogv)))
3025 {
af09ea45 3026 /* this isn't the name of a filehandle either */
1c846c1f 3027 if (!packname ||
fd400ab9 3028 ((UTF8_IS_START(*packname) && DO_UTF8(sv))
b86a2fa7 3029 ? !isIDFIRST_utf8((U8*)packname)
834a4ddd
LW
3030 : !isIDFIRST(*packname)
3031 ))
3032 {
f5d5a27c
CS
3033 Perl_croak(aTHX_ "Can't call method \"%s\" %s", name,
3034 SvOK(sv) ? "without a package or object reference"
3035 : "on an undefined value");
834a4ddd 3036 }
af09ea45
IK
3037 /* assume it's a package name */
3038 stash = gv_stashpvn(packname, packlen, FALSE);
ac91690f 3039 goto fetch;
a0d0e21e 3040 }
af09ea45 3041 /* it _is_ a filehandle name -- replace with a reference */
3280af22 3042 *(PL_stack_base + TOPMARK + 1) = sv_2mortal(newRV((SV*)iogv));
a0d0e21e
LW
3043 }
3044
af09ea45 3045 /* if we got here, ob should be a reference or a glob */
f0d43078
GS
3046 if (!ob || !(SvOBJECT(ob)
3047 || (SvTYPE(ob) == SVt_PVGV && (ob = (SV*)GvIO((GV*)ob))
3048 && SvOBJECT(ob))))
3049 {
f5d5a27c
CS
3050 Perl_croak(aTHX_ "Can't call method \"%s\" on unblessed reference",
3051 name);
f0d43078 3052 }
a0d0e21e 3053
56304f61 3054 stash = SvSTASH(ob);
a0d0e21e 3055
ac91690f 3056 fetch:
af09ea45
IK
3057 /* NOTE: stash may be null, hope hv_fetch_ent and
3058 gv_fetchmethod can cope (it seems they can) */
3059
f5d5a27c
CS
3060 /* shortcut for simple names */
3061 if (hashp) {
3062 HE* he = hv_fetch_ent(stash, meth, 0, *hashp);
3063 if (he) {
3064 gv = (GV*)HeVAL(he);
3065 if (isGV(gv) && GvCV(gv) &&
3066 (!GvCVGEN(gv) || GvCVGEN(gv) == PL_sub_generation))
3067 return (SV*)GvCV(gv);
3068 }
3069 }
3070
ac91690f 3071 gv = gv_fetchmethod(stash, name);
af09ea45 3072
56304f61 3073 if (!gv) {
af09ea45
IK
3074 /* This code tries to figure out just what went wrong with
3075 gv_fetchmethod. It therefore needs to duplicate a lot of
3076 the internals of that function. We can't move it inside
3077 Perl_gv_fetchmethod_autoload(), however, since that would
3078 cause UNIVERSAL->can("NoSuchPackage::foo") to croak, and we
3079 don't want that.
3080 */
56304f61
CS
3081 char* leaf = name;
3082 char* sep = Nullch;
3083 char* p;
3084
3085 for (p = name; *p; p++) {
3086 if (*p == '\'')
3087 sep = p, leaf = p + 1;
3088 else if (*p == ':' && *(p + 1) == ':')
3089 sep = p, leaf = p + 2;
3090 }
3091 if (!sep || ((sep - name) == 5 && strnEQ(name, "SUPER", 5))) {
af09ea45
IK
3092 /* the method name is unqualified or starts with SUPER:: */
3093 packname = sep ? CopSTASHPV(PL_curcop) :
3094 stash ? HvNAME(stash) : packname;
56304f61
CS
3095 packlen = strlen(packname);
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}
22239a37 3118
4d1ff10f 3119#ifdef USE_5005THREADS
51371543 3120static void
acfe0abc 3121unset_cvowner(pTHX_ void *cvarg)
51371543
GS
3122{
3123 register CV* cv = (CV *) cvarg;
51371543 3124
bf49b057 3125 DEBUG_S((PerlIO_printf(Perl_debug_log, "%p unsetting CvOWNER of %p:%s\n",
51371543
GS
3126 thr, cv, SvPEEK((SV*)cv))));
3127 MUTEX_LOCK(CvMUTEXP(cv));
3128 DEBUG_S(if (CvDEPTH(cv) != 0)
bf49b057 3129 PerlIO_printf(Perl_debug_log, "depth %ld != 0\n",
755b0776 3130 CvDEPTH(cv)));
51371543
GS
3131 assert(thr == CvOWNER(cv));
3132 CvOWNER(cv) = 0;
3133 MUTEX_UNLOCK(CvMUTEXP(cv));
3134 SvREFCNT_dec(cv);
3135}
4d1ff10f 3136#endif /* USE_5005THREADS */