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[perl5.git] / pp_hot.c
CommitLineData
a0d0e21e
LW
1/* pp_hot.c
2 *
4bb101f2 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
b94e2f88 4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, by Larry Wall and others
a0d0e21e
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
9 */
10
11/*
12 * Then he heard Merry change the note, and up went the Horn-cry of Buckland,
13 * shaking the air.
14 *
15 * Awake! Awake! Fear, Fire, Foes! Awake!
16 * Fire, Foes! Awake!
17 */
18
166f8a29
DM
19/* This file contains 'hot' pp ("push/pop") functions that
20 * execute the opcodes that make up a perl program. A typical pp function
21 * expects to find its arguments on the stack, and usually pushes its
22 * results onto the stack, hence the 'pp' terminology. Each OP structure
23 * contains a pointer to the relevant pp_foo() function.
24 *
25 * By 'hot', we mean common ops whose execution speed is critical.
26 * By gathering them together into a single file, we encourage
27 * CPU cache hits on hot code. Also it could be taken as a warning not to
28 * change any code in this file unless you're sure it won't affect
29 * performance.
30 */
31
a0d0e21e 32#include "EXTERN.h"
864dbfa3 33#define PERL_IN_PP_HOT_C
a0d0e21e
LW
34#include "perl.h"
35
36/* Hot code. */
37
38PP(pp_const)
39{
97aff369 40 dVAR;
39644a26 41 dSP;
1d7c1841 42 XPUSHs(cSVOP_sv);
a0d0e21e
LW
43 RETURN;
44}
45
46PP(pp_nextstate)
47{
97aff369 48 dVAR;
533c011a 49 PL_curcop = (COP*)PL_op;
a0d0e21e 50 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 51 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e
LW
52 FREETMPS;
53 return NORMAL;
54}
55
56PP(pp_gvsv)
57{
97aff369 58 dVAR;
39644a26 59 dSP;
924508f0 60 EXTEND(SP,1);
533c011a 61 if (PL_op->op_private & OPpLVAL_INTRO)
1d7c1841 62 PUSHs(save_scalar(cGVOP_gv));
a0d0e21e 63 else
c69033f2 64 PUSHs(GvSVn(cGVOP_gv));
a0d0e21e
LW
65 RETURN;
66}
67
68PP(pp_null)
69{
97aff369 70 dVAR;
a0d0e21e
LW
71 return NORMAL;
72}
73
7399586d
HS
74PP(pp_setstate)
75{
97aff369 76 dVAR;
7399586d
HS
77 PL_curcop = (COP*)PL_op;
78 return NORMAL;
79}
80
a0d0e21e
LW
81PP(pp_pushmark)
82{
97aff369 83 dVAR;
3280af22 84 PUSHMARK(PL_stack_sp);
a0d0e21e
LW
85 return NORMAL;
86}
87
88PP(pp_stringify)
89{
97aff369 90 dVAR; dSP; dTARGET;
6050d10e 91 sv_copypv(TARG,TOPs);
a0d0e21e
LW
92 SETTARG;
93 RETURN;
94}
95
96PP(pp_gv)
97{
97aff369 98 dVAR; dSP;
1d7c1841 99 XPUSHs((SV*)cGVOP_gv);
a0d0e21e
LW
100 RETURN;
101}
102
103PP(pp_and)
104{
97aff369 105 dVAR; dSP;
a0d0e21e
LW
106 if (!SvTRUE(TOPs))
107 RETURN;
108 else {
c960fc3b
SP
109 if (PL_op->op_type == OP_AND)
110 --SP;
a0d0e21e
LW
111 RETURNOP(cLOGOP->op_other);
112 }
113}
114
115PP(pp_sassign)
116{
97aff369 117 dVAR; dSP; dPOPTOPssrl;
748a9306 118
533c011a 119 if (PL_op->op_private & OPpASSIGN_BACKWARDS) {
0bd48802
AL
120 SV * const temp = left;
121 left = right; right = temp;
a0d0e21e 122 }
3280af22 123 if (PL_tainting && PL_tainted && !SvTAINTED(left))
a0d0e21e 124 TAINT_NOT;
e26df76a 125 if (PL_op->op_private & OPpASSIGN_CV_TO_GV) {
6136c704 126 SV * const cv = SvRV(left);
e26df76a
NC
127 const U32 cv_type = SvTYPE(cv);
128 const U32 gv_type = SvTYPE(right);
6136c704 129 const bool got_coderef = cv_type == SVt_PVCV || cv_type == SVt_PVFM;
e26df76a
NC
130
131 if (!got_coderef) {
132 assert(SvROK(cv));
133 }
134
135 /* Can do the optimisation if right (LVAUE) is not a typeglob,
136 left (RVALUE) is a reference to something, and we're in void
137 context. */
138 if (!got_coderef && gv_type != SVt_PVGV && GIMME_V == G_VOID) {
139 /* Is the target symbol table currently empty? */
6136c704 140 GV * const gv = gv_fetchsv(right, GV_NOINIT, SVt_PVGV);
bb112e5a 141 if (SvTYPE(gv) != SVt_PVGV && !SvOK(gv)) {
e26df76a
NC
142 /* Good. Create a new proxy constant subroutine in the target.
143 The gv becomes a(nother) reference to the constant. */
144 SV *const value = SvRV(cv);
145
146 SvUPGRADE((SV *)gv, SVt_RV);
147 SvROK_on(gv);
148 SvRV_set(gv, value);
149 SvREFCNT_inc(value);
150 SETs(right);
151 RETURN;
152 }
153 }
154
155 /* Need to fix things up. */
156 if (gv_type != SVt_PVGV) {
157 /* Need to fix GV. */
158 right = (SV*)gv_fetchsv(right, GV_ADD, SVt_PVGV);
159 }
160
161 if (!got_coderef) {
162 /* We've been returned a constant rather than a full subroutine,
163 but they expect a subroutine reference to apply. */
164 ENTER;
165 SvREFCNT_inc(SvRV(cv));
166 /* newCONSTSUB takes a reference count on the passed in SV
167 from us. We set the name to NULL, otherwise we get into
168 all sorts of fun as the reference to our new sub is
169 donated to the GV that we're about to assign to.
170 */
171 SvRV_set(left, (SV *)newCONSTSUB(GvSTASH(right), NULL,
172 SvRV(cv)));
173 SvREFCNT_dec(cv);
174 LEAVE;
e26df76a
NC
175 }
176
177 }
54310121 178 SvSetMagicSV(right, left);
a0d0e21e
LW
179 SETs(right);
180 RETURN;
181}
182
183PP(pp_cond_expr)
184{
97aff369 185 dVAR; dSP;
a0d0e21e 186 if (SvTRUEx(POPs))
1a67a97c 187 RETURNOP(cLOGOP->op_other);
a0d0e21e 188 else
1a67a97c 189 RETURNOP(cLOGOP->op_next);
a0d0e21e
LW
190}
191
192PP(pp_unstack)
193{
97aff369 194 dVAR;
a0d0e21e
LW
195 I32 oldsave;
196 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 197 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e 198 FREETMPS;
3280af22 199 oldsave = PL_scopestack[PL_scopestack_ix - 1];
a0d0e21e
LW
200 LEAVE_SCOPE(oldsave);
201 return NORMAL;
202}
203
a0d0e21e
LW
204PP(pp_concat)
205{
97aff369 206 dVAR; dSP; dATARGET; tryAMAGICbin(concat,opASSIGN);
748a9306
LW
207 {
208 dPOPTOPssrl;
8d6d96c1
HS
209 bool lbyte;
210 STRLEN rlen;
a6b599c7
RGS
211 const char *rpv = 0;
212 bool rbyte = FALSE;
a9c4fd4e 213 bool rcopied = FALSE;
8d6d96c1
HS
214
215 if (TARG == right && right != left) {
c75ab21a
RH
216 /* mg_get(right) may happen here ... */
217 rpv = SvPV_const(right, rlen);
218 rbyte = !DO_UTF8(right);
8d6d96c1 219 right = sv_2mortal(newSVpvn(rpv, rlen));
349d4f2f 220 rpv = SvPV_const(right, rlen); /* no point setting UTF-8 here */
db79b45b 221 rcopied = TRUE;
8d6d96c1 222 }
7889fe52 223
8d6d96c1 224 if (TARG != left) {
a9c4fd4e 225 STRLEN llen;
5c144d81 226 const char* const lpv = SvPV_const(left, llen); /* mg_get(left) may happen here */
90f5826e 227 lbyte = !DO_UTF8(left);
8d6d96c1
HS
228 sv_setpvn(TARG, lpv, llen);
229 if (!lbyte)
230 SvUTF8_on(TARG);
231 else
232 SvUTF8_off(TARG);
233 }
234 else { /* TARG == left */
a9c4fd4e 235 STRLEN llen;
5b295bef 236 SvGETMAGIC(left); /* or mg_get(left) may happen here */
c75ab21a
RH
237 if (!SvOK(TARG)) {
238 if (left == right && ckWARN(WARN_UNINITIALIZED))
239 report_uninit(right);
c69006e4 240 sv_setpvn(left, "", 0);
c75ab21a 241 }
10516c54 242 (void)SvPV_nomg_const(left, llen); /* Needed to set UTF8 flag */
90f5826e
ST
243 lbyte = !DO_UTF8(left);
244 if (IN_BYTES)
245 SvUTF8_off(TARG);
8d6d96c1 246 }
a12c0f56 247
c75ab21a
RH
248 /* or mg_get(right) may happen here */
249 if (!rcopied) {
250 rpv = SvPV_const(right, rlen);
251 rbyte = !DO_UTF8(right);
252 }
8d6d96c1
HS
253 if (lbyte != rbyte) {
254 if (lbyte)
255 sv_utf8_upgrade_nomg(TARG);
256 else {
db79b45b
JH
257 if (!rcopied)
258 right = sv_2mortal(newSVpvn(rpv, rlen));
8d6d96c1 259 sv_utf8_upgrade_nomg(right);
349d4f2f 260 rpv = SvPV_const(right, rlen);
69b47968 261 }
a0d0e21e 262 }
8d6d96c1 263 sv_catpvn_nomg(TARG, rpv, rlen);
43ebc500 264
a0d0e21e
LW
265 SETTARG;
266 RETURN;
748a9306 267 }
a0d0e21e
LW
268}
269
270PP(pp_padsv)
271{
97aff369 272 dVAR; dSP; dTARGET;
a0d0e21e 273 XPUSHs(TARG);
533c011a
NIS
274 if (PL_op->op_flags & OPf_MOD) {
275 if (PL_op->op_private & OPpLVAL_INTRO)
dd2155a4 276 SAVECLEARSV(PAD_SVl(PL_op->op_targ));
a62b51b8 277 if (PL_op->op_private & OPpDEREF) {
8ec5e241 278 PUTBACK;
dd2155a4 279 vivify_ref(PAD_SVl(PL_op->op_targ), PL_op->op_private & OPpDEREF);
8ec5e241
NIS
280 SPAGAIN;
281 }
4633a7c4 282 }
a0d0e21e
LW
283 RETURN;
284}
285
286PP(pp_readline)
287{
97aff369 288 dVAR;
f5284f61 289 tryAMAGICunTARGET(iter, 0);
3280af22 290 PL_last_in_gv = (GV*)(*PL_stack_sp--);
8efb3254 291 if (SvTYPE(PL_last_in_gv) != SVt_PVGV) {
1c846c1f 292 if (SvROK(PL_last_in_gv) && SvTYPE(SvRV(PL_last_in_gv)) == SVt_PVGV)
f5284f61 293 PL_last_in_gv = (GV*)SvRV(PL_last_in_gv);
8efb3254 294 else {
f5284f61
IZ
295 dSP;
296 XPUSHs((SV*)PL_last_in_gv);
297 PUTBACK;
cea2e8a9 298 pp_rv2gv();
f5284f61 299 PL_last_in_gv = (GV*)(*PL_stack_sp--);
f5284f61
IZ
300 }
301 }
a0d0e21e
LW
302 return do_readline();
303}
304
305PP(pp_eq)
306{
97aff369 307 dVAR; dSP; tryAMAGICbinSET(eq,0);
4c9fe80f 308#ifndef NV_PRESERVES_UV
0bdaccee 309 if (SvROK(TOPs) && !SvAMAGIC(TOPs) && SvROK(TOPm1s) && !SvAMAGIC(TOPm1s)) {
e61d22ef
NC
310 SP--;
311 SETs(boolSV(SvRV(TOPs) == SvRV(TOPp1s)));
4c9fe80f
AS
312 RETURN;
313 }
314#endif
28e5dec8
JH
315#ifdef PERL_PRESERVE_IVUV
316 SvIV_please(TOPs);
317 if (SvIOK(TOPs)) {
4c9fe80f
AS
318 /* Unless the left argument is integer in range we are going
319 to have to use NV maths. Hence only attempt to coerce the
320 right argument if we know the left is integer. */
28e5dec8
JH
321 SvIV_please(TOPm1s);
322 if (SvIOK(TOPm1s)) {
0bd48802
AL
323 const bool auvok = SvUOK(TOPm1s);
324 const bool buvok = SvUOK(TOPs);
a12c0f56 325
1605159e
NC
326 if (auvok == buvok) { /* ## IV == IV or UV == UV ## */
327 /* Casting IV to UV before comparison isn't going to matter
328 on 2s complement. On 1s complement or sign&magnitude
329 (if we have any of them) it could to make negative zero
330 differ from normal zero. As I understand it. (Need to
331 check - is negative zero implementation defined behaviour
332 anyway?). NWC */
0bd48802
AL
333 const UV buv = SvUVX(POPs);
334 const UV auv = SvUVX(TOPs);
28e5dec8 335
28e5dec8
JH
336 SETs(boolSV(auv == buv));
337 RETURN;
338 }
339 { /* ## Mixed IV,UV ## */
1605159e 340 SV *ivp, *uvp;
28e5dec8 341 IV iv;
28e5dec8 342
1605159e 343 /* == is commutative so doesn't matter which is left or right */
28e5dec8 344 if (auvok) {
1605159e
NC
345 /* top of stack (b) is the iv */
346 ivp = *SP;
347 uvp = *--SP;
348 } else {
349 uvp = *SP;
350 ivp = *--SP;
351 }
352 iv = SvIVX(ivp);
353 if (iv < 0) {
354 /* As uv is a UV, it's >0, so it cannot be == */
355 SETs(&PL_sv_no);
356 RETURN;
357 }
28e5dec8 358 /* we know iv is >= 0 */
1605159e 359 SETs(boolSV((UV)iv == SvUVX(uvp)));
28e5dec8
JH
360 RETURN;
361 }
362 }
363 }
364#endif
a0d0e21e
LW
365 {
366 dPOPnv;
54310121 367 SETs(boolSV(TOPn == value));
a0d0e21e
LW
368 RETURN;
369 }
370}
371
372PP(pp_preinc)
373{
97aff369 374 dVAR; dSP;
f39684df 375 if (SvTYPE(TOPs) >= SVt_PVGV && SvTYPE(TOPs) != SVt_PVLV)
d470f89e 376 DIE(aTHX_ PL_no_modify);
3510b4a1
NC
377 if (!SvREADONLY(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
378 && SvIVX(TOPs) != IV_MAX)
55497cff 379 {
45977657 380 SvIV_set(TOPs, SvIVX(TOPs) + 1);
55497cff 381 SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
748a9306 382 }
28e5dec8 383 else /* Do all the PERL_PRESERVE_IVUV conditionals in sv_inc */
748a9306 384 sv_inc(TOPs);
a0d0e21e
LW
385 SvSETMAGIC(TOPs);
386 return NORMAL;
387}
388
389PP(pp_or)
390{
97aff369 391 dVAR; dSP;
a0d0e21e
LW
392 if (SvTRUE(TOPs))
393 RETURN;
394 else {
c960fc3b
SP
395 if (PL_op->op_type == OP_OR)
396 --SP;
a0d0e21e
LW
397 RETURNOP(cLOGOP->op_other);
398 }
399}
400
25a55bd7 401PP(pp_defined)
c963b151 402{
97aff369 403 dVAR; dSP;
6136c704
AL
404 register SV* sv;
405 bool defined;
25a55bd7 406 const int op_type = PL_op->op_type;
6136c704 407 const int is_dor = (op_type == OP_DOR || op_type == OP_DORASSIGN);
c963b151 408
6136c704 409 if (is_dor) {
25a55bd7
SP
410 sv = TOPs;
411 if (!sv || !SvANY(sv)) {
2bd49cfc
NC
412 if (op_type == OP_DOR)
413 --SP;
25a55bd7
SP
414 RETURNOP(cLOGOP->op_other);
415 }
416 } else if (op_type == OP_DEFINED) {
417 sv = POPs;
418 if (!sv || !SvANY(sv))
419 RETPUSHNO;
d9aa96a4 420 } else
52a5c517 421 DIE(aTHX_ "panic: Invalid op (%s) in pp_defined()", OP_NAME(PL_op));
25a55bd7 422
6136c704 423 defined = FALSE;
c963b151
BD
424 switch (SvTYPE(sv)) {
425 case SVt_PVAV:
426 if (AvMAX(sv) >= 0 || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 427 defined = TRUE;
c963b151
BD
428 break;
429 case SVt_PVHV:
430 if (HvARRAY(sv) || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 431 defined = TRUE;
c963b151
BD
432 break;
433 case SVt_PVCV:
434 if (CvROOT(sv) || CvXSUB(sv))
25a55bd7 435 defined = TRUE;
c963b151
BD
436 break;
437 default:
5b295bef 438 SvGETMAGIC(sv);
c963b151 439 if (SvOK(sv))
25a55bd7 440 defined = TRUE;
6136c704 441 break;
c963b151 442 }
6136c704
AL
443
444 if (is_dor) {
c960fc3b
SP
445 if(defined)
446 RETURN;
447 if(op_type == OP_DOR)
448 --SP;
25a55bd7 449 RETURNOP(cLOGOP->op_other);
25a55bd7 450 }
d9aa96a4
SP
451 /* assuming OP_DEFINED */
452 if(defined)
453 RETPUSHYES;
454 RETPUSHNO;
c963b151
BD
455}
456
a0d0e21e
LW
457PP(pp_add)
458{
97aff369 459 dVAR; dSP; dATARGET; bool useleft; tryAMAGICbin(add,opASSIGN);
28e5dec8
JH
460 useleft = USE_LEFT(TOPm1s);
461#ifdef PERL_PRESERVE_IVUV
462 /* We must see if we can perform the addition with integers if possible,
463 as the integer code detects overflow while the NV code doesn't.
464 If either argument hasn't had a numeric conversion yet attempt to get
465 the IV. It's important to do this now, rather than just assuming that
466 it's not IOK as a PV of "9223372036854775806" may not take well to NV
467 addition, and an SV which is NOK, NV=6.0 ought to be coerced to
468 integer in case the second argument is IV=9223372036854775806
469 We can (now) rely on sv_2iv to do the right thing, only setting the
470 public IOK flag if the value in the NV (or PV) slot is truly integer.
471
472 A side effect is that this also aggressively prefers integer maths over
7dca457a
NC
473 fp maths for integer values.
474
a00b5bd3 475 How to detect overflow?
7dca457a
NC
476
477 C 99 section 6.2.6.1 says
478
479 The range of nonnegative values of a signed integer type is a subrange
480 of the corresponding unsigned integer type, and the representation of
481 the same value in each type is the same. A computation involving
482 unsigned operands can never overflow, because a result that cannot be
483 represented by the resulting unsigned integer type is reduced modulo
484 the number that is one greater than the largest value that can be
485 represented by the resulting type.
486
487 (the 9th paragraph)
488
489 which I read as "unsigned ints wrap."
490
491 signed integer overflow seems to be classed as "exception condition"
492
493 If an exceptional condition occurs during the evaluation of an
494 expression (that is, if the result is not mathematically defined or not
495 in the range of representable values for its type), the behavior is
496 undefined.
497
498 (6.5, the 5th paragraph)
499
500 I had assumed that on 2s complement machines signed arithmetic would
501 wrap, hence coded pp_add and pp_subtract on the assumption that
502 everything perl builds on would be happy. After much wailing and
503 gnashing of teeth it would seem that irix64 knows its ANSI spec well,
504 knows that it doesn't need to, and doesn't. Bah. Anyway, the all-
505 unsigned code below is actually shorter than the old code. :-)
506 */
507
28e5dec8
JH
508 SvIV_please(TOPs);
509 if (SvIOK(TOPs)) {
510 /* Unless the left argument is integer in range we are going to have to
511 use NV maths. Hence only attempt to coerce the right argument if
512 we know the left is integer. */
9c5ffd7c
JH
513 register UV auv = 0;
514 bool auvok = FALSE;
7dca457a
NC
515 bool a_valid = 0;
516
28e5dec8 517 if (!useleft) {
7dca457a
NC
518 auv = 0;
519 a_valid = auvok = 1;
520 /* left operand is undef, treat as zero. + 0 is identity,
521 Could SETi or SETu right now, but space optimise by not adding
522 lots of code to speed up what is probably a rarish case. */
523 } else {
524 /* Left operand is defined, so is it IV? */
525 SvIV_please(TOPm1s);
526 if (SvIOK(TOPm1s)) {
527 if ((auvok = SvUOK(TOPm1s)))
528 auv = SvUVX(TOPm1s);
529 else {
a3b680e6 530 register const IV aiv = SvIVX(TOPm1s);
7dca457a
NC
531 if (aiv >= 0) {
532 auv = aiv;
533 auvok = 1; /* Now acting as a sign flag. */
534 } else { /* 2s complement assumption for IV_MIN */
535 auv = (UV)-aiv;
536 }
537 }
538 a_valid = 1;
28e5dec8
JH
539 }
540 }
7dca457a
NC
541 if (a_valid) {
542 bool result_good = 0;
543 UV result;
544 register UV buv;
28e5dec8 545 bool buvok = SvUOK(TOPs);
a00b5bd3 546
7dca457a
NC
547 if (buvok)
548 buv = SvUVX(TOPs);
549 else {
a3b680e6 550 register const IV biv = SvIVX(TOPs);
7dca457a
NC
551 if (biv >= 0) {
552 buv = biv;
553 buvok = 1;
554 } else
555 buv = (UV)-biv;
556 }
557 /* ?uvok if value is >= 0. basically, flagged as UV if it's +ve,
602f51c4 558 else "IV" now, independent of how it came in.
7dca457a
NC
559 if a, b represents positive, A, B negative, a maps to -A etc
560 a + b => (a + b)
561 A + b => -(a - b)
562 a + B => (a - b)
563 A + B => -(a + b)
564 all UV maths. negate result if A negative.
565 add if signs same, subtract if signs differ. */
566
567 if (auvok ^ buvok) {
568 /* Signs differ. */
569 if (auv >= buv) {
570 result = auv - buv;
571 /* Must get smaller */
572 if (result <= auv)
573 result_good = 1;
574 } else {
575 result = buv - auv;
576 if (result <= buv) {
577 /* result really should be -(auv-buv). as its negation
578 of true value, need to swap our result flag */
579 auvok = !auvok;
580 result_good = 1;
28e5dec8
JH
581 }
582 }
7dca457a
NC
583 } else {
584 /* Signs same */
585 result = auv + buv;
586 if (result >= auv)
587 result_good = 1;
588 }
589 if (result_good) {
590 SP--;
591 if (auvok)
28e5dec8 592 SETu( result );
7dca457a
NC
593 else {
594 /* Negate result */
595 if (result <= (UV)IV_MIN)
596 SETi( -(IV)result );
597 else {
598 /* result valid, but out of range for IV. */
599 SETn( -(NV)result );
28e5dec8
JH
600 }
601 }
7dca457a
NC
602 RETURN;
603 } /* Overflow, drop through to NVs. */
28e5dec8
JH
604 }
605 }
606#endif
a0d0e21e 607 {
28e5dec8
JH
608 dPOPnv;
609 if (!useleft) {
610 /* left operand is undef, treat as zero. + 0.0 is identity. */
611 SETn(value);
612 RETURN;
613 }
614 SETn( value + TOPn );
615 RETURN;
a0d0e21e
LW
616 }
617}
618
619PP(pp_aelemfast)
620{
97aff369 621 dVAR; dSP;
c445ea15 622 AV * const av = PL_op->op_flags & OPf_SPECIAL ?
6a077020 623 (AV*)PAD_SV(PL_op->op_targ) : GvAV(cGVOP_gv);
a3b680e6 624 const U32 lval = PL_op->op_flags & OPf_MOD;
0bd48802 625 SV** const svp = av_fetch(av, PL_op->op_private, lval);
3280af22 626 SV *sv = (svp ? *svp : &PL_sv_undef);
6ff81951 627 EXTEND(SP, 1);
be6c24e0
GS
628 if (!lval && SvGMAGICAL(sv)) /* see note in pp_helem() */
629 sv = sv_mortalcopy(sv);
630 PUSHs(sv);
a0d0e21e
LW
631 RETURN;
632}
633
634PP(pp_join)
635{
97aff369 636 dVAR; dSP; dMARK; dTARGET;
a0d0e21e
LW
637 MARK++;
638 do_join(TARG, *MARK, MARK, SP);
639 SP = MARK;
640 SETs(TARG);
641 RETURN;
642}
643
644PP(pp_pushre)
645{
97aff369 646 dVAR; dSP;
44a8e56a
PP
647#ifdef DEBUGGING
648 /*
649 * We ass_u_me that LvTARGOFF() comes first, and that two STRLENs
650 * will be enough to hold an OP*.
651 */
c4420975 652 SV* const sv = sv_newmortal();
44a8e56a
PP
653 sv_upgrade(sv, SVt_PVLV);
654 LvTYPE(sv) = '/';
533c011a 655 Copy(&PL_op, &LvTARGOFF(sv), 1, OP*);
44a8e56a
PP
656 XPUSHs(sv);
657#else
6b88bc9c 658 XPUSHs((SV*)PL_op);
44a8e56a 659#endif
a0d0e21e
LW
660 RETURN;
661}
662
663/* Oversized hot code. */
664
665PP(pp_print)
666{
27da23d5 667 dVAR; dSP; dMARK; dORIGMARK;
a0d0e21e 668 IO *io;
760ac839 669 register PerlIO *fp;
236988e4 670 MAGIC *mg;
0bd48802 671 GV * const gv = (PL_op->op_flags & OPf_STACKED) ? (GV*)*++MARK : PL_defoutgv;
5b468f54
AMS
672
673 if (gv && (io = GvIO(gv))
674 && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar)))
675 {
01bb7c6d 676 had_magic:
68dc0745 677 if (MARK == ORIGMARK) {
1c846c1f 678 /* If using default handle then we need to make space to
a60c0954
NIS
679 * pass object as 1st arg, so move other args up ...
680 */
4352c267 681 MEXTEND(SP, 1);
68dc0745
PP
682 ++MARK;
683 Move(MARK, MARK + 1, (SP - MARK) + 1, SV*);
684 ++SP;
685 }
686 PUSHMARK(MARK - 1);
5b468f54 687 *MARK = SvTIED_obj((SV*)io, mg);
68dc0745 688 PUTBACK;
236988e4 689 ENTER;
864dbfa3 690 call_method("PRINT", G_SCALAR);
236988e4
PP
691 LEAVE;
692 SPAGAIN;
68dc0745
PP
693 MARK = ORIGMARK + 1;
694 *MARK = *SP;
695 SP = MARK;
236988e4
PP
696 RETURN;
697 }
a0d0e21e 698 if (!(io = GvIO(gv))) {
5b468f54
AMS
699 if ((GvEGV(gv)) && (io = GvIO(GvEGV(gv)))
700 && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar)))
01bb7c6d 701 goto had_magic;
2dd78f96
JH
702 if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
703 report_evil_fh(gv, io, PL_op->op_type);
93189314 704 SETERRNO(EBADF,RMS_IFI);
a0d0e21e
LW
705 goto just_say_no;
706 }
707 else if (!(fp = IoOFP(io))) {
599cee73 708 if (ckWARN2(WARN_CLOSED, WARN_IO)) {
4c80c0b2
NC
709 if (IoIFP(io))
710 report_evil_fh(gv, io, OP_phoney_INPUT_ONLY);
2dd78f96 711 else if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
bc37a18f 712 report_evil_fh(gv, io, PL_op->op_type);
a0d0e21e 713 }
93189314 714 SETERRNO(EBADF,IoIFP(io)?RMS_FAC:RMS_IFI);
a0d0e21e
LW
715 goto just_say_no;
716 }
717 else {
718 MARK++;
7889fe52 719 if (PL_ofs_sv && SvOK(PL_ofs_sv)) {
a0d0e21e
LW
720 while (MARK <= SP) {
721 if (!do_print(*MARK, fp))
722 break;
723 MARK++;
724 if (MARK <= SP) {
7889fe52 725 if (!do_print(PL_ofs_sv, fp)) { /* $, */
a0d0e21e
LW
726 MARK--;
727 break;
728 }
729 }
730 }
731 }
732 else {
733 while (MARK <= SP) {
734 if (!do_print(*MARK, fp))
735 break;
736 MARK++;
737 }
738 }
739 if (MARK <= SP)
740 goto just_say_no;
741 else {
7889fe52
NIS
742 if (PL_ors_sv && SvOK(PL_ors_sv))
743 if (!do_print(PL_ors_sv, fp)) /* $\ */
a0d0e21e
LW
744 goto just_say_no;
745
746 if (IoFLAGS(io) & IOf_FLUSH)
760ac839 747 if (PerlIO_flush(fp) == EOF)
a0d0e21e
LW
748 goto just_say_no;
749 }
750 }
751 SP = ORIGMARK;
e52fd6f4 752 XPUSHs(&PL_sv_yes);
a0d0e21e
LW
753 RETURN;
754
755 just_say_no:
756 SP = ORIGMARK;
e52fd6f4 757 XPUSHs(&PL_sv_undef);
a0d0e21e
LW
758 RETURN;
759}
760
761PP(pp_rv2av)
762{
97aff369 763 dVAR; dSP; dTOPss;
a0d0e21e
LW
764 AV *av;
765
766 if (SvROK(sv)) {
767 wasref:
f5284f61
IZ
768 tryAMAGICunDEREF(to_av);
769
a0d0e21e
LW
770 av = (AV*)SvRV(sv);
771 if (SvTYPE(av) != SVt_PVAV)
cea2e8a9 772 DIE(aTHX_ "Not an ARRAY reference");
533c011a 773 if (PL_op->op_flags & OPf_REF) {
f5284f61 774 SETs((SV*)av);
a0d0e21e
LW
775 RETURN;
776 }
78f9721b
SM
777 else if (LVRET) {
778 if (GIMME == G_SCALAR)
779 Perl_croak(aTHX_ "Can't return array to lvalue scalar context");
780 SETs((SV*)av);
781 RETURN;
782 }
82d03984
RGS
783 else if (PL_op->op_flags & OPf_MOD
784 && PL_op->op_private & OPpLVAL_INTRO)
785 Perl_croak(aTHX_ PL_no_localize_ref);
a0d0e21e
LW
786 }
787 else {
788 if (SvTYPE(sv) == SVt_PVAV) {
789 av = (AV*)sv;
533c011a 790 if (PL_op->op_flags & OPf_REF) {
f5284f61 791 SETs((SV*)av);
a0d0e21e
LW
792 RETURN;
793 }
78f9721b
SM
794 else if (LVRET) {
795 if (GIMME == G_SCALAR)
796 Perl_croak(aTHX_ "Can't return array to lvalue"
797 " scalar context");
798 SETs((SV*)av);
799 RETURN;
800 }
a0d0e21e
LW
801 }
802 else {
67955e0c 803 GV *gv;
1c846c1f 804
a0d0e21e
LW
805 if (SvTYPE(sv) != SVt_PVGV) {
806 if (SvGMAGICAL(sv)) {
807 mg_get(sv);
808 if (SvROK(sv))
809 goto wasref;
810 }
811 if (!SvOK(sv)) {
533c011a
NIS
812 if (PL_op->op_flags & OPf_REF ||
813 PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 814 DIE(aTHX_ PL_no_usym, "an ARRAY");
599cee73 815 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 816 report_uninit(sv);
f5284f61 817 if (GIMME == G_ARRAY) {
c2444246 818 (void)POPs;
4633a7c4 819 RETURN;
f5284f61
IZ
820 }
821 RETSETUNDEF;
a0d0e21e 822 }
35cd451c
GS
823 if ((PL_op->op_flags & OPf_SPECIAL) &&
824 !(PL_op->op_flags & OPf_MOD))
825 {
f776e3cd 826 gv = (GV*)gv_fetchsv(sv, 0, SVt_PVAV);
c9d5ac95 827 if (!gv
7a5fd60d 828 && (!is_gv_magical_sv(sv,0)
f776e3cd 829 || !(gv = (GV*)gv_fetchsv(sv, GV_ADD, SVt_PVAV))))
c9d5ac95 830 {
35cd451c 831 RETSETUNDEF;
c9d5ac95 832 }
35cd451c
GS
833 }
834 else {
835 if (PL_op->op_private & HINT_STRICT_REFS)
7a5fd60d 836 DIE(aTHX_ PL_no_symref_sv, sv, "an ARRAY");
f776e3cd 837 gv = (GV*)gv_fetchsv(sv, GV_ADD, SVt_PVAV);
35cd451c
GS
838 }
839 }
840 else {
67955e0c 841 gv = (GV*)sv;
a0d0e21e 842 }
67955e0c 843 av = GvAVn(gv);
533c011a 844 if (PL_op->op_private & OPpLVAL_INTRO)
67955e0c 845 av = save_ary(gv);
533c011a 846 if (PL_op->op_flags & OPf_REF) {
f5284f61 847 SETs((SV*)av);
a0d0e21e
LW
848 RETURN;
849 }
78f9721b
SM
850 else if (LVRET) {
851 if (GIMME == G_SCALAR)
852 Perl_croak(aTHX_ "Can't return array to lvalue"
853 " scalar context");
854 SETs((SV*)av);
855 RETURN;
856 }
a0d0e21e
LW
857 }
858 }
859
860 if (GIMME == G_ARRAY) {
a3b680e6 861 const I32 maxarg = AvFILL(av) + 1;
c2444246 862 (void)POPs; /* XXXX May be optimized away? */
1c846c1f 863 EXTEND(SP, maxarg);
93965878 864 if (SvRMAGICAL(av)) {
1c846c1f 865 U32 i;
eb160463 866 for (i=0; i < (U32)maxarg; i++) {
0bcc34c2 867 SV ** const svp = av_fetch(av, i, FALSE);
547d1dd8
HS
868 /* See note in pp_helem, and bug id #27839 */
869 SP[i+1] = svp
870 ? SvGMAGICAL(*svp) ? sv_mortalcopy(*svp) : *svp
871 : &PL_sv_undef;
93965878 872 }
1c846c1f 873 }
93965878
NIS
874 else {
875 Copy(AvARRAY(av), SP+1, maxarg, SV*);
876 }
a0d0e21e
LW
877 SP += maxarg;
878 }
c754c3d7 879 else if (GIMME_V == G_SCALAR) {
a0d0e21e 880 dTARGET;
a3b680e6 881 const I32 maxarg = AvFILL(av) + 1;
f5284f61 882 SETi(maxarg);
a0d0e21e
LW
883 }
884 RETURN;
885}
886
887PP(pp_rv2hv)
888{
97aff369 889 dVAR; dSP; dTOPss;
a0d0e21e 890 HV *hv;
a3b680e6
AL
891 const I32 gimme = GIMME_V;
892 static const char return_hash_to_lvalue_scalar[] = "Can't return hash to lvalue scalar context";
a0d0e21e
LW
893
894 if (SvROK(sv)) {
895 wasref:
f5284f61
IZ
896 tryAMAGICunDEREF(to_hv);
897
a0d0e21e 898 hv = (HV*)SvRV(sv);
6d822dc4 899 if (SvTYPE(hv) != SVt_PVHV)
cea2e8a9 900 DIE(aTHX_ "Not a HASH reference");
533c011a 901 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
902 SETs((SV*)hv);
903 RETURN;
904 }
78f9721b 905 else if (LVRET) {
be85d344 906 if (gimme != G_ARRAY)
a3b680e6 907 Perl_croak(aTHX_ return_hash_to_lvalue_scalar );
78f9721b
SM
908 SETs((SV*)hv);
909 RETURN;
910 }
82d03984
RGS
911 else if (PL_op->op_flags & OPf_MOD
912 && PL_op->op_private & OPpLVAL_INTRO)
913 Perl_croak(aTHX_ PL_no_localize_ref);
a0d0e21e
LW
914 }
915 else {
6d822dc4 916 if (SvTYPE(sv) == SVt_PVHV) {
a0d0e21e 917 hv = (HV*)sv;
533c011a 918 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
919 SETs((SV*)hv);
920 RETURN;
921 }
78f9721b 922 else if (LVRET) {
be85d344 923 if (gimme != G_ARRAY)
a3b680e6 924 Perl_croak(aTHX_ return_hash_to_lvalue_scalar );
78f9721b
SM
925 SETs((SV*)hv);
926 RETURN;
927 }
a0d0e21e
LW
928 }
929 else {
67955e0c 930 GV *gv;
1c846c1f 931
a0d0e21e
LW
932 if (SvTYPE(sv) != SVt_PVGV) {
933 if (SvGMAGICAL(sv)) {
934 mg_get(sv);
935 if (SvROK(sv))
936 goto wasref;
937 }
938 if (!SvOK(sv)) {
533c011a
NIS
939 if (PL_op->op_flags & OPf_REF ||
940 PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 941 DIE(aTHX_ PL_no_usym, "a HASH");
599cee73 942 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 943 report_uninit(sv);
be85d344 944 if (gimme == G_ARRAY) {
4633a7c4
LW
945 SP--;
946 RETURN;
947 }
a0d0e21e
LW
948 RETSETUNDEF;
949 }
35cd451c
GS
950 if ((PL_op->op_flags & OPf_SPECIAL) &&
951 !(PL_op->op_flags & OPf_MOD))
952 {
f776e3cd 953 gv = (GV*)gv_fetchsv(sv, 0, SVt_PVHV);
c9d5ac95 954 if (!gv
7a5fd60d 955 && (!is_gv_magical_sv(sv,0)
f776e3cd 956 || !(gv = (GV*)gv_fetchsv(sv, GV_ADD, SVt_PVHV))))
c9d5ac95 957 {
35cd451c 958 RETSETUNDEF;
c9d5ac95 959 }
35cd451c
GS
960 }
961 else {
962 if (PL_op->op_private & HINT_STRICT_REFS)
7a5fd60d 963 DIE(aTHX_ PL_no_symref_sv, sv, "a HASH");
f776e3cd 964 gv = (GV*)gv_fetchsv(sv, GV_ADD, SVt_PVHV);
35cd451c
GS
965 }
966 }
967 else {
67955e0c 968 gv = (GV*)sv;
a0d0e21e 969 }
67955e0c 970 hv = GvHVn(gv);
533c011a 971 if (PL_op->op_private & OPpLVAL_INTRO)
67955e0c 972 hv = save_hash(gv);
533c011a 973 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
974 SETs((SV*)hv);
975 RETURN;
976 }
78f9721b 977 else if (LVRET) {
be85d344 978 if (gimme != G_ARRAY)
a3b680e6 979 Perl_croak(aTHX_ return_hash_to_lvalue_scalar );
78f9721b
SM
980 SETs((SV*)hv);
981 RETURN;
982 }
a0d0e21e
LW
983 }
984 }
985
be85d344 986 if (gimme == G_ARRAY) { /* array wanted */
3280af22 987 *PL_stack_sp = (SV*)hv;
cea2e8a9 988 return do_kv();
a0d0e21e 989 }
be85d344 990 else if (gimme == G_SCALAR) {
a0d0e21e 991 dTARGET;
243d6ab3 992 TARG = Perl_hv_scalar(aTHX_ hv);
a0d0e21e 993 SETTARG;
a0d0e21e 994 }
be85d344 995 RETURN;
a0d0e21e
LW
996}
997
10c8fecd
GS
998STATIC void
999S_do_oddball(pTHX_ HV *hash, SV **relem, SV **firstrelem)
1000{
97aff369 1001 dVAR;
10c8fecd
GS
1002 if (*relem) {
1003 SV *tmpstr;
b464bac0 1004 const HE *didstore;
6d822dc4
MS
1005
1006 if (ckWARN(WARN_MISC)) {
a3b680e6 1007 const char *err;
10c8fecd
GS
1008 if (relem == firstrelem &&
1009 SvROK(*relem) &&
1010 (SvTYPE(SvRV(*relem)) == SVt_PVAV ||
1011 SvTYPE(SvRV(*relem)) == SVt_PVHV))
1012 {
a3b680e6 1013 err = "Reference found where even-sized list expected";
10c8fecd
GS
1014 }
1015 else
a3b680e6
AL
1016 err = "Odd number of elements in hash assignment";
1017 Perl_warner(aTHX_ packWARN(WARN_MISC), err);
10c8fecd 1018 }
6d822dc4 1019
561b68a9 1020 tmpstr = newSV(0);
6d822dc4
MS
1021 didstore = hv_store_ent(hash,*relem,tmpstr,0);
1022 if (SvMAGICAL(hash)) {
1023 if (SvSMAGICAL(tmpstr))
1024 mg_set(tmpstr);
1025 if (!didstore)
1026 sv_2mortal(tmpstr);
1027 }
1028 TAINT_NOT;
10c8fecd
GS
1029 }
1030}
1031
a0d0e21e
LW
1032PP(pp_aassign)
1033{
27da23d5 1034 dVAR; dSP;
3280af22
NIS
1035 SV **lastlelem = PL_stack_sp;
1036 SV **lastrelem = PL_stack_base + POPMARK;
1037 SV **firstrelem = PL_stack_base + POPMARK + 1;
a0d0e21e
LW
1038 SV **firstlelem = lastrelem + 1;
1039
1040 register SV **relem;
1041 register SV **lelem;
1042
1043 register SV *sv;
1044 register AV *ary;
1045
54310121 1046 I32 gimme;
a0d0e21e
LW
1047 HV *hash;
1048 I32 i;
1049 int magic;
ca65944e 1050 int duplicates = 0;
cbbf8932 1051 SV **firsthashrelem = NULL; /* "= 0" keeps gcc 2.95 quiet */
5637b936 1052
a0d0e21e 1053
3280af22 1054 PL_delaymagic = DM_DELAY; /* catch simultaneous items */
ca65944e 1055 gimme = GIMME_V;
a0d0e21e
LW
1056
1057 /* If there's a common identifier on both sides we have to take
1058 * special care that assigning the identifier on the left doesn't
1059 * clobber a value on the right that's used later in the list.
1060 */
10c8fecd 1061 if (PL_op->op_private & (OPpASSIGN_COMMON)) {
cc5e57d2 1062 EXTEND_MORTAL(lastrelem - firstrelem + 1);
10c8fecd 1063 for (relem = firstrelem; relem <= lastrelem; relem++) {
155aba94 1064 if ((sv = *relem)) {
a1f49e72 1065 TAINT_NOT; /* Each item is independent */
10c8fecd 1066 *relem = sv_mortalcopy(sv);
a1f49e72 1067 }
10c8fecd 1068 }
a0d0e21e
LW
1069 }
1070
1071 relem = firstrelem;
1072 lelem = firstlelem;
1073 ary = Null(AV*);
1074 hash = Null(HV*);
10c8fecd 1075
a0d0e21e 1076 while (lelem <= lastlelem) {
bbce6d69 1077 TAINT_NOT; /* Each item stands on its own, taintwise. */
a0d0e21e
LW
1078 sv = *lelem++;
1079 switch (SvTYPE(sv)) {
1080 case SVt_PVAV:
1081 ary = (AV*)sv;
748a9306 1082 magic = SvMAGICAL(ary) != 0;
a0d0e21e 1083 av_clear(ary);
7e42bd57 1084 av_extend(ary, lastrelem - relem);
a0d0e21e
LW
1085 i = 0;
1086 while (relem <= lastrelem) { /* gobble up all the rest */
5117ca91 1087 SV **didstore;
a0d0e21e 1088 assert(*relem);
f2b990bf 1089 sv = newSVsv(*relem);
a0d0e21e 1090 *(relem++) = sv;
5117ca91
GS
1091 didstore = av_store(ary,i++,sv);
1092 if (magic) {
fb73857a
PP
1093 if (SvSMAGICAL(sv))
1094 mg_set(sv);
5117ca91 1095 if (!didstore)
8127e0e3 1096 sv_2mortal(sv);
5117ca91 1097 }
bbce6d69 1098 TAINT_NOT;
a0d0e21e
LW
1099 }
1100 break;
10c8fecd 1101 case SVt_PVHV: { /* normal hash */
a0d0e21e
LW
1102 SV *tmpstr;
1103
1104 hash = (HV*)sv;
748a9306 1105 magic = SvMAGICAL(hash) != 0;
a0d0e21e 1106 hv_clear(hash);
ca65944e 1107 firsthashrelem = relem;
a0d0e21e
LW
1108
1109 while (relem < lastrelem) { /* gobble up all the rest */
5117ca91 1110 HE *didstore;
6136c704
AL
1111 sv = *relem ? *relem : &PL_sv_no;
1112 relem++;
561b68a9 1113 tmpstr = newSV(0);
a0d0e21e
LW
1114 if (*relem)
1115 sv_setsv(tmpstr,*relem); /* value */
1116 *(relem++) = tmpstr;
ca65944e
RGS
1117 if (gimme != G_VOID && hv_exists_ent(hash, sv, 0))
1118 /* key overwrites an existing entry */
1119 duplicates += 2;
5117ca91
GS
1120 didstore = hv_store_ent(hash,sv,tmpstr,0);
1121 if (magic) {
fb73857a
PP
1122 if (SvSMAGICAL(tmpstr))
1123 mg_set(tmpstr);
5117ca91 1124 if (!didstore)
8127e0e3 1125 sv_2mortal(tmpstr);
5117ca91 1126 }
bbce6d69 1127 TAINT_NOT;
8e07c86e 1128 }
6a0deba8 1129 if (relem == lastrelem) {
10c8fecd 1130 do_oddball(hash, relem, firstrelem);
6a0deba8 1131 relem++;
1930e939 1132 }
a0d0e21e
LW
1133 }
1134 break;
1135 default:
6fc92669
GS
1136 if (SvIMMORTAL(sv)) {
1137 if (relem <= lastrelem)
1138 relem++;
1139 break;
a0d0e21e
LW
1140 }
1141 if (relem <= lastrelem) {
1142 sv_setsv(sv, *relem);
1143 *(relem++) = sv;
1144 }
1145 else
3280af22 1146 sv_setsv(sv, &PL_sv_undef);
a0d0e21e
LW
1147 SvSETMAGIC(sv);
1148 break;
1149 }
1150 }
3280af22
NIS
1151 if (PL_delaymagic & ~DM_DELAY) {
1152 if (PL_delaymagic & DM_UID) {
a0d0e21e 1153#ifdef HAS_SETRESUID
fb934a90
RD
1154 (void)setresuid((PL_delaymagic & DM_RUID) ? PL_uid : (Uid_t)-1,
1155 (PL_delaymagic & DM_EUID) ? PL_euid : (Uid_t)-1,
1156 (Uid_t)-1);
56febc5e
AD
1157#else
1158# ifdef HAS_SETREUID
fb934a90
RD
1159 (void)setreuid((PL_delaymagic & DM_RUID) ? PL_uid : (Uid_t)-1,
1160 (PL_delaymagic & DM_EUID) ? PL_euid : (Uid_t)-1);
56febc5e
AD
1161# else
1162# ifdef HAS_SETRUID
b28d0864
NIS
1163 if ((PL_delaymagic & DM_UID) == DM_RUID) {
1164 (void)setruid(PL_uid);
1165 PL_delaymagic &= ~DM_RUID;
a0d0e21e 1166 }
56febc5e
AD
1167# endif /* HAS_SETRUID */
1168# ifdef HAS_SETEUID
b28d0864 1169 if ((PL_delaymagic & DM_UID) == DM_EUID) {
fb934a90 1170 (void)seteuid(PL_euid);
b28d0864 1171 PL_delaymagic &= ~DM_EUID;
a0d0e21e 1172 }
56febc5e 1173# endif /* HAS_SETEUID */
b28d0864
NIS
1174 if (PL_delaymagic & DM_UID) {
1175 if (PL_uid != PL_euid)
cea2e8a9 1176 DIE(aTHX_ "No setreuid available");
b28d0864 1177 (void)PerlProc_setuid(PL_uid);
a0d0e21e 1178 }
56febc5e
AD
1179# endif /* HAS_SETREUID */
1180#endif /* HAS_SETRESUID */
d8eceb89
JH
1181 PL_uid = PerlProc_getuid();
1182 PL_euid = PerlProc_geteuid();
a0d0e21e 1183 }
3280af22 1184 if (PL_delaymagic & DM_GID) {
a0d0e21e 1185#ifdef HAS_SETRESGID
fb934a90
RD
1186 (void)setresgid((PL_delaymagic & DM_RGID) ? PL_gid : (Gid_t)-1,
1187 (PL_delaymagic & DM_EGID) ? PL_egid : (Gid_t)-1,
1188 (Gid_t)-1);
56febc5e
AD
1189#else
1190# ifdef HAS_SETREGID
fb934a90
RD
1191 (void)setregid((PL_delaymagic & DM_RGID) ? PL_gid : (Gid_t)-1,
1192 (PL_delaymagic & DM_EGID) ? PL_egid : (Gid_t)-1);
56febc5e
AD
1193# else
1194# ifdef HAS_SETRGID
b28d0864
NIS
1195 if ((PL_delaymagic & DM_GID) == DM_RGID) {
1196 (void)setrgid(PL_gid);
1197 PL_delaymagic &= ~DM_RGID;
a0d0e21e 1198 }
56febc5e
AD
1199# endif /* HAS_SETRGID */
1200# ifdef HAS_SETEGID
b28d0864 1201 if ((PL_delaymagic & DM_GID) == DM_EGID) {
fb934a90 1202 (void)setegid(PL_egid);
b28d0864 1203 PL_delaymagic &= ~DM_EGID;
a0d0e21e 1204 }
56febc5e 1205# endif /* HAS_SETEGID */
b28d0864
NIS
1206 if (PL_delaymagic & DM_GID) {
1207 if (PL_gid != PL_egid)
cea2e8a9 1208 DIE(aTHX_ "No setregid available");
b28d0864 1209 (void)PerlProc_setgid(PL_gid);
a0d0e21e 1210 }
56febc5e
AD
1211# endif /* HAS_SETREGID */
1212#endif /* HAS_SETRESGID */
d8eceb89
JH
1213 PL_gid = PerlProc_getgid();
1214 PL_egid = PerlProc_getegid();
a0d0e21e 1215 }
3280af22 1216 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
a0d0e21e 1217 }
3280af22 1218 PL_delaymagic = 0;
54310121 1219
54310121
PP
1220 if (gimme == G_VOID)
1221 SP = firstrelem - 1;
1222 else if (gimme == G_SCALAR) {
1223 dTARGET;
1224 SP = firstrelem;
ca65944e 1225 SETi(lastrelem - firstrelem + 1 - duplicates);
54310121
PP
1226 }
1227 else {
ca65944e 1228 if (ary)
a0d0e21e 1229 SP = lastrelem;
ca65944e
RGS
1230 else if (hash) {
1231 if (duplicates) {
1232 /* Removes from the stack the entries which ended up as
1233 * duplicated keys in the hash (fix for [perl #24380]) */
1234 Move(firsthashrelem + duplicates,
1235 firsthashrelem, duplicates, SV**);
1236 lastrelem -= duplicates;
1237 }
1238 SP = lastrelem;
1239 }
a0d0e21e
LW
1240 else
1241 SP = firstrelem + (lastlelem - firstlelem);
0c8c7a05 1242 lelem = firstlelem + (relem - firstrelem);
5f05dabc 1243 while (relem <= SP)
3280af22 1244 *relem++ = (lelem <= lastlelem) ? *lelem++ : &PL_sv_undef;
a0d0e21e 1245 }
54310121 1246 RETURN;
a0d0e21e
LW
1247}
1248
8782bef2
GB
1249PP(pp_qr)
1250{
97aff369 1251 dVAR; dSP;
c4420975
AL
1252 register PMOP * const pm = cPMOP;
1253 SV * const rv = sv_newmortal();
1254 SV * const sv = newSVrv(rv, "Regexp");
e08e52cf
AMS
1255 if (pm->op_pmdynflags & PMdf_TAINTED)
1256 SvTAINTED_on(rv);
aaa362c4 1257 sv_magic(sv,(SV*)ReREFCNT_inc(PM_GETRE(pm)), PERL_MAGIC_qr,0,0);
8782bef2
GB
1258 RETURNX(PUSHs(rv));
1259}
1260
a0d0e21e
LW
1261PP(pp_match)
1262{
97aff369 1263 dVAR; dSP; dTARG;
a0d0e21e 1264 register PMOP *pm = cPMOP;
d65afb4b 1265 PMOP *dynpm = pm;
0d46e09a
SP
1266 register const char *t;
1267 register const char *s;
5c144d81 1268 const char *strend;
a0d0e21e 1269 I32 global;
f722798b 1270 I32 r_flags = REXEC_CHECKED;
5c144d81 1271 const char *truebase; /* Start of string */
aaa362c4 1272 register REGEXP *rx = PM_GETRE(pm);
b3eb6a9b 1273 bool rxtainted;
a3b680e6 1274 const I32 gimme = GIMME;
a0d0e21e 1275 STRLEN len;
748a9306 1276 I32 minmatch = 0;
a3b680e6 1277 const I32 oldsave = PL_savestack_ix;
f86702cc 1278 I32 update_minmatch = 1;
e60df1fa 1279 I32 had_zerolen = 0;
a0d0e21e 1280
533c011a 1281 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 1282 TARG = POPs;
59f00321
RGS
1283 else if (PL_op->op_private & OPpTARGET_MY)
1284 GETTARGET;
a0d0e21e 1285 else {
54b9620d 1286 TARG = DEFSV;
a0d0e21e
LW
1287 EXTEND(SP,1);
1288 }
d9f424b2 1289
c277df42 1290 PUTBACK; /* EVAL blocks need stack_sp. */
5c144d81 1291 s = SvPV_const(TARG, len);
a0d0e21e 1292 if (!s)
2269b42e 1293 DIE(aTHX_ "panic: pp_match");
890ce7af 1294 strend = s + len;
b3eb6a9b 1295 rxtainted = ((pm->op_pmdynflags & PMdf_TAINTED) ||
3280af22 1296 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
9212bbba 1297 TAINT_NOT;
a0d0e21e 1298
a30b2f1f 1299 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 1300
d65afb4b 1301 /* PMdf_USED is set after a ?? matches once */
48c036b1 1302 if (pm->op_pmdynflags & PMdf_USED) {
c277df42 1303 failure:
a0d0e21e
LW
1304 if (gimme == G_ARRAY)
1305 RETURN;
1306 RETPUSHNO;
1307 }
1308
d65afb4b 1309 /* empty pattern special-cased to use last successful pattern if possible */
3280af22
NIS
1310 if (!rx->prelen && PL_curpm) {
1311 pm = PL_curpm;
aaa362c4 1312 rx = PM_GETRE(pm);
a0d0e21e 1313 }
d65afb4b 1314
eb160463 1315 if (rx->minlen > (I32)len)
d65afb4b 1316 goto failure;
c277df42 1317
a0d0e21e 1318 truebase = t = s;
ad94a511
IZ
1319
1320 /* XXXX What part of this is needed with true \G-support? */
d65afb4b 1321 if ((global = dynpm->op_pmflags & PMf_GLOBAL)) {
cf93c79d 1322 rx->startp[0] = -1;
a0d0e21e 1323 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
c445ea15 1324 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
565764a8 1325 if (mg && mg->mg_len >= 0) {
b7a35066 1326 if (!(rx->reganch & ROPT_GPOS_SEEN))
1c846c1f 1327 rx->endp[0] = rx->startp[0] = mg->mg_len;
0ef3e39e
HS
1328 else if (rx->reganch & ROPT_ANCH_GPOS) {
1329 r_flags |= REXEC_IGNOREPOS;
1c846c1f 1330 rx->endp[0] = rx->startp[0] = mg->mg_len;
0ef3e39e 1331 }
748a9306 1332 minmatch = (mg->mg_flags & MGf_MINMATCH);
f86702cc 1333 update_minmatch = 0;
748a9306 1334 }
a0d0e21e
LW
1335 }
1336 }
14977893
JH
1337 if ((!global && rx->nparens)
1338 || SvTEMP(TARG) || PL_sawampersand)
1339 r_flags |= REXEC_COPY_STR;
1c846c1f 1340 if (SvSCREAM(TARG))
22e551b9
IZ
1341 r_flags |= REXEC_SCREAM;
1342
a0d0e21e 1343play_it_again:
cf93c79d
IZ
1344 if (global && rx->startp[0] != -1) {
1345 t = s = rx->endp[0] + truebase;
d9f97599 1346 if ((s + rx->minlen) > strend)
a0d0e21e 1347 goto nope;
f86702cc 1348 if (update_minmatch++)
e60df1fa 1349 minmatch = had_zerolen;
a0d0e21e 1350 }
60aeb6fd
NIS
1351 if (rx->reganch & RE_USE_INTUIT &&
1352 DO_UTF8(TARG) == ((rx->reganch & ROPT_UTF8) != 0)) {
5c144d81
NC
1353 /* FIXME - can PL_bostr be made const char *? */
1354 PL_bostr = (char *)truebase;
1355 s = CALLREG_INTUIT_START(aTHX_ rx, TARG, (char *)s, (char *)strend, r_flags, NULL);
f722798b
IZ
1356
1357 if (!s)
1358 goto nope;
1359 if ( (rx->reganch & ROPT_CHECK_ALL)
14977893 1360 && !PL_sawampersand
f722798b
IZ
1361 && ((rx->reganch & ROPT_NOSCAN)
1362 || !((rx->reganch & RE_INTUIT_TAIL)
05b4157f
GS
1363 && (r_flags & REXEC_SCREAM)))
1364 && !SvROK(TARG)) /* Cannot trust since INTUIT cannot guess ^ */
f722798b 1365 goto yup;
a0d0e21e 1366 }
5c144d81 1367 if (CALLREGEXEC(aTHX_ rx, (char*)s, (char *)strend, (char*)truebase, minmatch, TARG, NULL, r_flags))
bbce6d69 1368 {
3280af22 1369 PL_curpm = pm;
d65afb4b
HS
1370 if (dynpm->op_pmflags & PMf_ONCE)
1371 dynpm->op_pmdynflags |= PMdf_USED;
a0d0e21e
LW
1372 goto gotcha;
1373 }
1374 else
1375 goto ret_no;
1376 /*NOTREACHED*/
1377
1378 gotcha:
72311751
GS
1379 if (rxtainted)
1380 RX_MATCH_TAINTED_on(rx);
1381 TAINT_IF(RX_MATCH_TAINTED(rx));
a0d0e21e 1382 if (gimme == G_ARRAY) {
a3b680e6
AL
1383 const I32 nparens = rx->nparens;
1384 I32 i = (global && !nparens) ? 1 : 0;
a0d0e21e 1385
c277df42 1386 SPAGAIN; /* EVAL blocks could move the stack. */
ffc61ed2
JH
1387 EXTEND(SP, nparens + i);
1388 EXTEND_MORTAL(nparens + i);
1389 for (i = !i; i <= nparens; i++) {
a0d0e21e 1390 PUSHs(sv_newmortal());
cf93c79d 1391 if ((rx->startp[i] != -1) && rx->endp[i] != -1 ) {
b464bac0 1392 const I32 len = rx->endp[i] - rx->startp[i];
289555fe 1393 s = rx->startp[i] + truebase;
290deeac
A
1394 if (rx->endp[i] < 0 || rx->startp[i] < 0 ||
1395 len < 0 || len > strend - s)
1396 DIE(aTHX_ "panic: pp_match start/end pointers");
a0d0e21e 1397 sv_setpvn(*SP, s, len);
cce850e4 1398 if (DO_UTF8(TARG) && is_utf8_string((U8*)s, len))
a197cbdd 1399 SvUTF8_on(*SP);
a0d0e21e
LW
1400 }
1401 }
1402 if (global) {
d65afb4b 1403 if (dynpm->op_pmflags & PMf_CONTINUE) {
6136c704 1404 MAGIC* mg = NULL;
0af80b60
HS
1405 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
1406 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1407 if (!mg) {
6136c704 1408 sv_magic(TARG, NULL, PERL_MAGIC_regex_global, NULL, 0);
0af80b60
HS
1409 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1410 }
1411 if (rx->startp[0] != -1) {
1412 mg->mg_len = rx->endp[0];
1413 if (rx->startp[0] == rx->endp[0])
1414 mg->mg_flags |= MGf_MINMATCH;
1415 else
1416 mg->mg_flags &= ~MGf_MINMATCH;
1417 }
1418 }
cf93c79d
IZ
1419 had_zerolen = (rx->startp[0] != -1
1420 && rx->startp[0] == rx->endp[0]);
c277df42 1421 PUTBACK; /* EVAL blocks may use stack */
cf93c79d 1422 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
1423 goto play_it_again;
1424 }
ffc61ed2 1425 else if (!nparens)
bde848c5 1426 XPUSHs(&PL_sv_yes);
4633a7c4 1427 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1428 RETURN;
1429 }
1430 else {
1431 if (global) {
cbbf8932 1432 MAGIC* mg;
a0d0e21e 1433 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
14befaf4 1434 mg = mg_find(TARG, PERL_MAGIC_regex_global);
cbbf8932
AL
1435 else
1436 mg = NULL;
a0d0e21e 1437 if (!mg) {
6136c704 1438 sv_magic(TARG, NULL, PERL_MAGIC_regex_global, NULL, 0);
14befaf4 1439 mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1440 }
cf93c79d
IZ
1441 if (rx->startp[0] != -1) {
1442 mg->mg_len = rx->endp[0];
d9f97599 1443 if (rx->startp[0] == rx->endp[0])
748a9306
LW
1444 mg->mg_flags |= MGf_MINMATCH;
1445 else
1446 mg->mg_flags &= ~MGf_MINMATCH;
1447 }
a0d0e21e 1448 }
4633a7c4 1449 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1450 RETPUSHYES;
1451 }
1452
f722798b 1453yup: /* Confirmed by INTUIT */
72311751
GS
1454 if (rxtainted)
1455 RX_MATCH_TAINTED_on(rx);
1456 TAINT_IF(RX_MATCH_TAINTED(rx));
3280af22 1457 PL_curpm = pm;
d65afb4b
HS
1458 if (dynpm->op_pmflags & PMf_ONCE)
1459 dynpm->op_pmdynflags |= PMdf_USED;
cf93c79d
IZ
1460 if (RX_MATCH_COPIED(rx))
1461 Safefree(rx->subbeg);
1462 RX_MATCH_COPIED_off(rx);
6136c704 1463 rx->subbeg = NULL;
a0d0e21e 1464 if (global) {
5c144d81
NC
1465 /* FIXME - should rx->subbeg be const char *? */
1466 rx->subbeg = (char *) truebase;
cf93c79d 1467 rx->startp[0] = s - truebase;
a30b2f1f 1468 if (RX_MATCH_UTF8(rx)) {
0bcc34c2 1469 char * const t = (char*)utf8_hop((U8*)s, rx->minlen);
60aeb6fd
NIS
1470 rx->endp[0] = t - truebase;
1471 }
1472 else {
1473 rx->endp[0] = s - truebase + rx->minlen;
1474 }
cf93c79d 1475 rx->sublen = strend - truebase;
a0d0e21e 1476 goto gotcha;
1c846c1f 1477 }
14977893
JH
1478 if (PL_sawampersand) {
1479 I32 off;
f8c7b90f 1480#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
1481 if (SvIsCOW(TARG) || (SvFLAGS(TARG) & CAN_COW_MASK) == CAN_COW_FLAGS) {
1482 if (DEBUG_C_TEST) {
1483 PerlIO_printf(Perl_debug_log,
1484 "Copy on write: pp_match $& capture, type %d, truebase=%p, t=%p, difference %d\n",
1485 (int) SvTYPE(TARG), truebase, t,
1486 (int)(t-truebase));
1487 }
1488 rx->saved_copy = sv_setsv_cow(rx->saved_copy, TARG);
555831ce 1489 rx->subbeg = (char *) SvPVX_const(rx->saved_copy) + (t - truebase);
ed252734
NC
1490 assert (SvPOKp(rx->saved_copy));
1491 } else
1492#endif
1493 {
14977893 1494
ed252734 1495 rx->subbeg = savepvn(t, strend - t);
f8c7b90f 1496#ifdef PERL_OLD_COPY_ON_WRITE
a0714e2c 1497 rx->saved_copy = NULL;
ed252734
NC
1498#endif
1499 }
14977893
JH
1500 rx->sublen = strend - t;
1501 RX_MATCH_COPIED_on(rx);
1502 off = rx->startp[0] = s - t;
1503 rx->endp[0] = off + rx->minlen;
1504 }
1505 else { /* startp/endp are used by @- @+. */
1506 rx->startp[0] = s - truebase;
1507 rx->endp[0] = s - truebase + rx->minlen;
1508 }
2d862feb 1509 rx->nparens = rx->lastparen = rx->lastcloseparen = 0; /* used by @-, @+, and $^N */
4633a7c4 1510 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1511 RETPUSHYES;
1512
1513nope:
a0d0e21e 1514ret_no:
d65afb4b 1515 if (global && !(dynpm->op_pmflags & PMf_CONTINUE)) {
a0d0e21e 1516 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
6136c704 1517 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1518 if (mg)
565764a8 1519 mg->mg_len = -1;
a0d0e21e
LW
1520 }
1521 }
4633a7c4 1522 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1523 if (gimme == G_ARRAY)
1524 RETURN;
1525 RETPUSHNO;
1526}
1527
1528OP *
864dbfa3 1529Perl_do_readline(pTHX)
a0d0e21e 1530{
27da23d5 1531 dVAR; dSP; dTARGETSTACKED;
a0d0e21e
LW
1532 register SV *sv;
1533 STRLEN tmplen = 0;
1534 STRLEN offset;
760ac839 1535 PerlIO *fp;
a3b680e6
AL
1536 register IO * const io = GvIO(PL_last_in_gv);
1537 register const I32 type = PL_op->op_type;
1538 const I32 gimme = GIMME_V;
a0d0e21e 1539
6136c704
AL
1540 if (io) {
1541 MAGIC * const mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar);
1542 if (mg) {
1543 PUSHMARK(SP);
1544 XPUSHs(SvTIED_obj((SV*)io, mg));
1545 PUTBACK;
1546 ENTER;
1547 call_method("READLINE", gimme);
1548 LEAVE;
1549 SPAGAIN;
1550 if (gimme == G_SCALAR) {
1551 SV* const result = POPs;
1552 SvSetSV_nosteal(TARG, result);
1553 PUSHTARG;
1554 }
1555 RETURN;
0b7c7b4f 1556 }
e79b0511 1557 }
a0d0e21e
LW
1558 fp = Nullfp;
1559 if (io) {
1560 fp = IoIFP(io);
1561 if (!fp) {
1562 if (IoFLAGS(io) & IOf_ARGV) {
1563 if (IoFLAGS(io) & IOf_START) {
a0d0e21e 1564 IoLINES(io) = 0;
3280af22 1565 if (av_len(GvAVn(PL_last_in_gv)) < 0) {
1d7c1841 1566 IoFLAGS(io) &= ~IOf_START;
9d116dd7 1567 do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,Nullfp);
c69033f2 1568 sv_setpvn(GvSVn(PL_last_in_gv), "-", 1);
3280af22 1569 SvSETMAGIC(GvSV(PL_last_in_gv));
a2008d6d
GS
1570 fp = IoIFP(io);
1571 goto have_fp;
a0d0e21e
LW
1572 }
1573 }
3280af22 1574 fp = nextargv(PL_last_in_gv);
a0d0e21e 1575 if (!fp) { /* Note: fp != IoIFP(io) */
3280af22 1576 (void)do_close(PL_last_in_gv, FALSE); /* now it does*/
a0d0e21e
LW
1577 }
1578 }
0d44d22b
NC
1579 else if (type == OP_GLOB)
1580 fp = Perl_start_glob(aTHX_ POPs, io);
a0d0e21e
LW
1581 }
1582 else if (type == OP_GLOB)
1583 SP--;
a00b5bd3 1584 else if (ckWARN(WARN_IO) && IoTYPE(io) == IoTYPE_WRONLY) {
4c80c0b2 1585 report_evil_fh(PL_last_in_gv, io, OP_phoney_OUTPUT_ONLY);
a00b5bd3 1586 }
a0d0e21e
LW
1587 }
1588 if (!fp) {
041457d9
DM
1589 if ((!io || !(IoFLAGS(io) & IOf_START))
1590 && ckWARN2(WARN_GLOB, WARN_CLOSED))
1591 {
3f4520fe 1592 if (type == OP_GLOB)
9014280d 1593 Perl_warner(aTHX_ packWARN(WARN_GLOB),
af8c498a
GS
1594 "glob failed (can't start child: %s)",
1595 Strerror(errno));
69282e91 1596 else
bc37a18f 1597 report_evil_fh(PL_last_in_gv, io, PL_op->op_type);
3f4520fe 1598 }
54310121 1599 if (gimme == G_SCALAR) {
79628082 1600 /* undef TARG, and push that undefined value */
ba92458f
AE
1601 if (type != OP_RCATLINE) {
1602 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1603 SvOK_off(TARG);
ba92458f 1604 }
a0d0e21e
LW
1605 PUSHTARG;
1606 }
1607 RETURN;
1608 }
a2008d6d 1609 have_fp:
54310121 1610 if (gimme == G_SCALAR) {
a0d0e21e 1611 sv = TARG;
9607fc9c
PP
1612 if (SvROK(sv))
1613 sv_unref(sv);
862a34c6 1614 SvUPGRADE(sv, SVt_PV);
a0d0e21e 1615 tmplen = SvLEN(sv); /* remember if already alloced */
bc44a8a2 1616 if (!tmplen && !SvREADONLY(sv))
a0d0e21e 1617 Sv_Grow(sv, 80); /* try short-buffering it */
2b5e58c4
AMS
1618 offset = 0;
1619 if (type == OP_RCATLINE && SvOK(sv)) {
1620 if (!SvPOK(sv)) {
8b6b16e7 1621 SvPV_force_nolen(sv);
2b5e58c4 1622 }
a0d0e21e 1623 offset = SvCUR(sv);
2b5e58c4 1624 }
a0d0e21e 1625 }
54310121 1626 else {
561b68a9 1627 sv = sv_2mortal(newSV(80));
54310121
PP
1628 offset = 0;
1629 }
fbad3eb5 1630
3887d568
AP
1631 /* This should not be marked tainted if the fp is marked clean */
1632#define MAYBE_TAINT_LINE(io, sv) \
1633 if (!(IoFLAGS(io) & IOf_UNTAINT)) { \
1634 TAINT; \
1635 SvTAINTED_on(sv); \
1636 }
1637
684bef36 1638/* delay EOF state for a snarfed empty file */
fbad3eb5 1639#define SNARF_EOF(gimme,rs,io,sv) \
684bef36 1640 (gimme != G_SCALAR || SvCUR(sv) \
b9fee9ba 1641 || (IoFLAGS(io) & IOf_NOLINE) || !RsSNARF(rs))
fbad3eb5 1642
a0d0e21e 1643 for (;;) {
09e8efcc 1644 PUTBACK;
fbad3eb5 1645 if (!sv_gets(sv, fp, offset)
2d726892
TF
1646 && (type == OP_GLOB
1647 || SNARF_EOF(gimme, PL_rs, io, sv)
1648 || PerlIO_error(fp)))
fbad3eb5 1649 {
760ac839 1650 PerlIO_clearerr(fp);
a0d0e21e 1651 if (IoFLAGS(io) & IOf_ARGV) {
3280af22 1652 fp = nextargv(PL_last_in_gv);
a0d0e21e
LW
1653 if (fp)
1654 continue;
3280af22 1655 (void)do_close(PL_last_in_gv, FALSE);
a0d0e21e
LW
1656 }
1657 else if (type == OP_GLOB) {
e476b1b5 1658 if (!do_close(PL_last_in_gv, FALSE) && ckWARN(WARN_GLOB)) {
9014280d 1659 Perl_warner(aTHX_ packWARN(WARN_GLOB),
4eb79ab5 1660 "glob failed (child exited with status %d%s)",
894356b3 1661 (int)(STATUS_CURRENT >> 8),
cf494569 1662 (STATUS_CURRENT & 0x80) ? ", core dumped" : "");
4eb79ab5 1663 }
a0d0e21e 1664 }
54310121 1665 if (gimme == G_SCALAR) {
ba92458f
AE
1666 if (type != OP_RCATLINE) {
1667 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1668 SvOK_off(TARG);
ba92458f 1669 }
09e8efcc 1670 SPAGAIN;
a0d0e21e
LW
1671 PUSHTARG;
1672 }
3887d568 1673 MAYBE_TAINT_LINE(io, sv);
a0d0e21e
LW
1674 RETURN;
1675 }
3887d568 1676 MAYBE_TAINT_LINE(io, sv);
a0d0e21e 1677 IoLINES(io)++;
b9fee9ba 1678 IoFLAGS(io) |= IOf_NOLINE;
71be2cbc 1679 SvSETMAGIC(sv);
09e8efcc 1680 SPAGAIN;
a0d0e21e 1681 XPUSHs(sv);
a0d0e21e 1682 if (type == OP_GLOB) {
349d4f2f 1683 const char *t1;
a0d0e21e 1684
3280af22 1685 if (SvCUR(sv) > 0 && SvCUR(PL_rs) > 0) {
6136c704 1686 char * const tmps = SvEND(sv) - 1;
aa07b2f6 1687 if (*tmps == *SvPVX_const(PL_rs)) {
c07a80fd 1688 *tmps = '\0';
b162af07 1689 SvCUR_set(sv, SvCUR(sv) - 1);
c07a80fd
PP
1690 }
1691 }
349d4f2f
NC
1692 for (t1 = SvPVX_const(sv); *t1; t1++)
1693 if (!isALPHA(*t1) && !isDIGIT(*t1) &&
1694 strchr("$&*(){}[]'\";\\|?<>~`", *t1))
a0d0e21e 1695 break;
349d4f2f 1696 if (*t1 && PerlLIO_lstat(SvPVX_const(sv), &PL_statbuf) < 0) {
a0d0e21e
LW
1697 (void)POPs; /* Unmatched wildcard? Chuck it... */
1698 continue;
1699 }
2d79bf7f 1700 } else if (SvUTF8(sv)) { /* OP_READLINE, OP_RCATLINE */
c445ea15 1701 const U8 * const s = (const U8*)SvPVX_const(sv) + offset;
7fc63493
AL
1702 const STRLEN len = SvCUR(sv) - offset;
1703 const U8 *f;
2d79bf7f 1704
ce44635a 1705 if (ckWARN(WARN_UTF8) &&
3a09494c 1706 !is_utf8_string_loc(s, len, &f))
2d79bf7f
JH
1707 /* Emulate :encoding(utf8) warning in the same case. */
1708 Perl_warner(aTHX_ packWARN(WARN_UTF8),
1709 "utf8 \"\\x%02X\" does not map to Unicode",
1710 f < (U8*)SvEND(sv) ? *f : 0);
a0d0e21e 1711 }
54310121 1712 if (gimme == G_ARRAY) {
a0d0e21e 1713 if (SvLEN(sv) - SvCUR(sv) > 20) {
1da4ca5f 1714 SvPV_shrink_to_cur(sv);
a0d0e21e 1715 }
561b68a9 1716 sv = sv_2mortal(newSV(80));
a0d0e21e
LW
1717 continue;
1718 }
54310121 1719 else if (gimme == G_SCALAR && !tmplen && SvLEN(sv) - SvCUR(sv) > 80) {
a0d0e21e 1720 /* try to reclaim a bit of scalar space (only on 1st alloc) */
d5b5861b
NC
1721 const STRLEN new_len
1722 = SvCUR(sv) < 60 ? 80 : SvCUR(sv)+40; /* allow some slop */
1da4ca5f 1723 SvPV_renew(sv, new_len);
a0d0e21e
LW
1724 }
1725 RETURN;
1726 }
1727}
1728
1729PP(pp_enter)
1730{
27da23d5 1731 dVAR; dSP;
c09156bb 1732 register PERL_CONTEXT *cx;
533c011a 1733 I32 gimme = OP_GIMME(PL_op, -1);
a0d0e21e 1734
54310121
PP
1735 if (gimme == -1) {
1736 if (cxstack_ix >= 0)
1737 gimme = cxstack[cxstack_ix].blk_gimme;
1738 else
1739 gimme = G_SCALAR;
1740 }
a0d0e21e
LW
1741
1742 ENTER;
1743
1744 SAVETMPS;
924508f0 1745 PUSHBLOCK(cx, CXt_BLOCK, SP);
a0d0e21e
LW
1746
1747 RETURN;
1748}
1749
1750PP(pp_helem)
1751{
97aff369 1752 dVAR; dSP;
760ac839 1753 HE* he;
ae77835f 1754 SV **svp;
c445ea15
AL
1755 SV * const keysv = POPs;
1756 HV * const hv = (HV*)POPs;
a3b680e6
AL
1757 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
1758 const U32 defer = PL_op->op_private & OPpLVAL_DEFER;
be6c24e0 1759 SV *sv;
c158a4fd 1760 const U32 hash = (SvIsCOW_shared_hash(keysv)) ? SvSHARED_HASH(keysv) : 0;
9c5ffd7c 1761 I32 preeminent = 0;
a0d0e21e 1762
ae77835f 1763 if (SvTYPE(hv) == SVt_PVHV) {
8d1f198f
DM
1764 if (PL_op->op_private & OPpLVAL_INTRO) {
1765 MAGIC *mg;
1766 HV *stash;
1767 /* does the element we're localizing already exist? */
c39e6ab0 1768 preeminent =
8d1f198f
DM
1769 /* can we determine whether it exists? */
1770 ( !SvRMAGICAL(hv)
1771 || mg_find((SV*)hv, PERL_MAGIC_env)
1772 || ( (mg = mg_find((SV*)hv, PERL_MAGIC_tied))
1773 /* Try to preserve the existenceness of a tied hash
1774 * element by using EXISTS and DELETE if possible.
1775 * Fallback to FETCH and STORE otherwise */
1776 && (stash = SvSTASH(SvRV(SvTIED_obj((SV*)hv, mg))))
1777 && gv_fetchmethod_autoload(stash, "EXISTS", TRUE)
1778 && gv_fetchmethod_autoload(stash, "DELETE", TRUE)
1779 )
1780 ) ? hv_exists_ent(hv, keysv, 0) : 1;
c39e6ab0 1781
8d1f198f 1782 }
1c846c1f 1783 he = hv_fetch_ent(hv, keysv, lval && !defer, hash);
6136c704 1784 svp = he ? &HeVAL(he) : NULL;
ae77835f 1785 }
c750a3ec 1786 else {
a0d0e21e 1787 RETPUSHUNDEF;
c750a3ec 1788 }
a0d0e21e 1789 if (lval) {
3280af22 1790 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
1791 SV* lv;
1792 SV* key2;
2d8e6c8d 1793 if (!defer) {
ce5030a2 1794 DIE(aTHX_ PL_no_helem_sv, keysv);
2d8e6c8d 1795 }
68dc0745
PP
1796 lv = sv_newmortal();
1797 sv_upgrade(lv, SVt_PVLV);
1798 LvTYPE(lv) = 'y';
6136c704 1799 sv_magic(lv, key2 = newSVsv(keysv), PERL_MAGIC_defelem, NULL, 0);
68dc0745
PP
1800 SvREFCNT_dec(key2); /* sv_magic() increments refcount */
1801 LvTARG(lv) = SvREFCNT_inc(hv);
1802 LvTARGLEN(lv) = 1;
1803 PUSHs(lv);
1804 RETURN;
1805 }
533c011a 1806 if (PL_op->op_private & OPpLVAL_INTRO) {
bfcb3514 1807 if (HvNAME_get(hv) && isGV(*svp))
533c011a 1808 save_gp((GV*)*svp, !(PL_op->op_flags & OPf_SPECIAL));
1f5346dc
SC
1809 else {
1810 if (!preeminent) {
1811 STRLEN keylen;
e62f0680 1812 const char * const key = SvPV_const(keysv, keylen);
57813020 1813 SAVEDELETE(hv, savepvn(key,keylen), keylen);
bfc4de9f 1814 } else
1f5346dc
SC
1815 save_helem(hv, keysv, svp);
1816 }
5f05dabc 1817 }
533c011a
NIS
1818 else if (PL_op->op_private & OPpDEREF)
1819 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 1820 }
3280af22 1821 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
1822 /* This makes C<local $tied{foo} = $tied{foo}> possible.
1823 * Pushing the magical RHS on to the stack is useless, since
1824 * that magic is soon destined to be misled by the local(),
1825 * and thus the later pp_sassign() will fail to mg_get() the
1826 * old value. This should also cure problems with delayed
1827 * mg_get()s. GSAR 98-07-03 */
1828 if (!lval && SvGMAGICAL(sv))
1829 sv = sv_mortalcopy(sv);
1830 PUSHs(sv);
a0d0e21e
LW
1831 RETURN;
1832}
1833
1834PP(pp_leave)
1835{
27da23d5 1836 dVAR; dSP;
c09156bb 1837 register PERL_CONTEXT *cx;
a0d0e21e
LW
1838 SV **newsp;
1839 PMOP *newpm;
1840 I32 gimme;
1841
533c011a 1842 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e 1843 cx = &cxstack[cxstack_ix];
3280af22 1844 cx->blk_oldpm = PL_curpm; /* fake block should preserve $1 et al */
a0d0e21e
LW
1845 }
1846
1847 POPBLOCK(cx,newpm);
1848
533c011a 1849 gimme = OP_GIMME(PL_op, -1);
54310121
PP
1850 if (gimme == -1) {
1851 if (cxstack_ix >= 0)
1852 gimme = cxstack[cxstack_ix].blk_gimme;
1853 else
1854 gimme = G_SCALAR;
1855 }
a0d0e21e 1856
a1f49e72 1857 TAINT_NOT;
54310121
PP
1858 if (gimme == G_VOID)
1859 SP = newsp;
1860 else if (gimme == G_SCALAR) {
a3b680e6 1861 register SV **mark;
54310121 1862 MARK = newsp + 1;
09256e2f 1863 if (MARK <= SP) {
54310121
PP
1864 if (SvFLAGS(TOPs) & (SVs_PADTMP|SVs_TEMP))
1865 *MARK = TOPs;
1866 else
1867 *MARK = sv_mortalcopy(TOPs);
09256e2f 1868 } else {
54310121 1869 MEXTEND(mark,0);
3280af22 1870 *MARK = &PL_sv_undef;
a0d0e21e 1871 }
54310121 1872 SP = MARK;
a0d0e21e 1873 }
54310121 1874 else if (gimme == G_ARRAY) {
a1f49e72 1875 /* in case LEAVE wipes old return values */
a3b680e6 1876 register SV **mark;
a1f49e72
CS
1877 for (mark = newsp + 1; mark <= SP; mark++) {
1878 if (!(SvFLAGS(*mark) & (SVs_PADTMP|SVs_TEMP))) {
a0d0e21e 1879 *mark = sv_mortalcopy(*mark);
a1f49e72
CS
1880 TAINT_NOT; /* Each item is independent */
1881 }
1882 }
a0d0e21e 1883 }
3280af22 1884 PL_curpm = newpm; /* Don't pop $1 et al till now */
a0d0e21e
LW
1885
1886 LEAVE;
1887
1888 RETURN;
1889}
1890
1891PP(pp_iter)
1892{
97aff369 1893 dVAR; dSP;
c09156bb 1894 register PERL_CONTEXT *cx;
dc09a129 1895 SV *sv, *oldsv;
4633a7c4 1896 AV* av;
1d7c1841 1897 SV **itersvp;
a0d0e21e 1898
924508f0 1899 EXTEND(SP, 1);
a0d0e21e 1900 cx = &cxstack[cxstack_ix];
6b35e009 1901 if (CxTYPE(cx) != CXt_LOOP)
cea2e8a9 1902 DIE(aTHX_ "panic: pp_iter");
a0d0e21e 1903
1d7c1841 1904 itersvp = CxITERVAR(cx);
4633a7c4 1905 av = cx->blk_loop.iterary;
89ea2908
GA
1906 if (SvTYPE(av) != SVt_PVAV) {
1907 /* iterate ($min .. $max) */
1908 if (cx->blk_loop.iterlval) {
1909 /* string increment */
1910 register SV* cur = cx->blk_loop.iterlval;
4fe3f0fa 1911 STRLEN maxlen = 0;
83003860 1912 const char *max = SvOK((SV*)av) ? SvPV_const((SV*)av, maxlen) : "";
89ea2908 1913 if (!SvNIOK(cur) && SvCUR(cur) <= maxlen) {
1d7c1841 1914 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1915 /* safe to reuse old SV */
1d7c1841 1916 sv_setsv(*itersvp, cur);
eaa5c2d6 1917 }
1c846c1f 1918 else
eaa5c2d6
GA
1919 {
1920 /* we need a fresh SV every time so that loop body sees a
1921 * completely new SV for closures/references to work as
1922 * they used to */
dc09a129 1923 oldsv = *itersvp;
1d7c1841 1924 *itersvp = newSVsv(cur);
dc09a129 1925 SvREFCNT_dec(oldsv);
eaa5c2d6 1926 }
aa07b2f6 1927 if (strEQ(SvPVX_const(cur), max))
89ea2908
GA
1928 sv_setiv(cur, 0); /* terminate next time */
1929 else
1930 sv_inc(cur);
1931 RETPUSHYES;
1932 }
1933 RETPUSHNO;
1934 }
1935 /* integer increment */
1936 if (cx->blk_loop.iterix > cx->blk_loop.itermax)
1937 RETPUSHNO;
7f61b687 1938
3db8f154 1939 /* don't risk potential race */
1d7c1841 1940 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1941 /* safe to reuse old SV */
1d7c1841 1942 sv_setiv(*itersvp, cx->blk_loop.iterix++);
eaa5c2d6 1943 }
1c846c1f 1944 else
eaa5c2d6
GA
1945 {
1946 /* we need a fresh SV every time so that loop body sees a
1947 * completely new SV for closures/references to work as they
1948 * used to */
dc09a129 1949 oldsv = *itersvp;
1d7c1841 1950 *itersvp = newSViv(cx->blk_loop.iterix++);
dc09a129 1951 SvREFCNT_dec(oldsv);
eaa5c2d6 1952 }
89ea2908
GA
1953 RETPUSHYES;
1954 }
1955
1956 /* iterate array */
ef3e5ea9
NC
1957 if (PL_op->op_private & OPpITER_REVERSED) {
1958 /* In reverse, use itermax as the min :-) */
c491ecac 1959 if (cx->blk_loop.iterix <= cx->blk_loop.itermax)
ef3e5ea9 1960 RETPUSHNO;
a0d0e21e 1961
ef3e5ea9 1962 if (SvMAGICAL(av) || AvREIFY(av)) {
c445ea15 1963 SV * const * const svp = av_fetch(av, --cx->blk_loop.iterix, FALSE);
a0714e2c 1964 sv = svp ? *svp : NULL;
ef3e5ea9
NC
1965 }
1966 else {
6e585ca0 1967 sv = AvARRAY(av)[--cx->blk_loop.iterix];
ef3e5ea9 1968 }
d42935ef
JH
1969 }
1970 else {
ef3e5ea9
NC
1971 if (cx->blk_loop.iterix >= (av == PL_curstack ? cx->blk_oldsp :
1972 AvFILL(av)))
1973 RETPUSHNO;
1974
1975 if (SvMAGICAL(av) || AvREIFY(av)) {
c445ea15 1976 SV * const * const svp = av_fetch(av, ++cx->blk_loop.iterix, FALSE);
a0714e2c 1977 sv = svp ? *svp : NULL;
ef3e5ea9
NC
1978 }
1979 else {
1980 sv = AvARRAY(av)[++cx->blk_loop.iterix];
1981 }
d42935ef 1982 }
ef3e5ea9 1983
0565a181 1984 if (sv && SvIS_FREED(sv)) {
a0714e2c 1985 *itersvp = NULL;
b6c83531 1986 Perl_croak(aTHX_ "Use of freed value in iteration");
cccede53
DM
1987 }
1988
d42935ef 1989 if (sv)
a0d0e21e 1990 SvTEMP_off(sv);
a0d0e21e 1991 else
3280af22 1992 sv = &PL_sv_undef;
8b530633 1993 if (av != PL_curstack && sv == &PL_sv_undef) {
5f05dabc 1994 SV *lv = cx->blk_loop.iterlval;
71be2cbc
PP
1995 if (lv && SvREFCNT(lv) > 1) {
1996 SvREFCNT_dec(lv);
a0714e2c 1997 lv = NULL;
71be2cbc 1998 }
5f05dabc
PP
1999 if (lv)
2000 SvREFCNT_dec(LvTARG(lv));
2001 else {
561b68a9 2002 lv = cx->blk_loop.iterlval = newSV(0);
5f05dabc 2003 sv_upgrade(lv, SVt_PVLV);
5f05dabc 2004 LvTYPE(lv) = 'y';
6136c704 2005 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
5f05dabc
PP
2006 }
2007 LvTARG(lv) = SvREFCNT_inc(av);
2008 LvTARGOFF(lv) = cx->blk_loop.iterix;
42718184 2009 LvTARGLEN(lv) = (STRLEN)UV_MAX;
5f05dabc
PP
2010 sv = (SV*)lv;
2011 }
a0d0e21e 2012
dc09a129 2013 oldsv = *itersvp;
1d7c1841 2014 *itersvp = SvREFCNT_inc(sv);
dc09a129
DM
2015 SvREFCNT_dec(oldsv);
2016
a0d0e21e
LW
2017 RETPUSHYES;
2018}
2019
2020PP(pp_subst)
2021{
97aff369 2022 dVAR; dSP; dTARG;
a0d0e21e
LW
2023 register PMOP *pm = cPMOP;
2024 PMOP *rpm = pm;
2025 register SV *dstr;
2026 register char *s;
2027 char *strend;
2028 register char *m;
5c144d81 2029 const char *c;
a0d0e21e
LW
2030 register char *d;
2031 STRLEN clen;
2032 I32 iters = 0;
2033 I32 maxiters;
2034 register I32 i;
2035 bool once;
71be2cbc 2036 bool rxtainted;
a0d0e21e 2037 char *orig;
22e551b9 2038 I32 r_flags;
aaa362c4 2039 register REGEXP *rx = PM_GETRE(pm);
a0d0e21e
LW
2040 STRLEN len;
2041 int force_on_match = 0;
0bcc34c2 2042 const I32 oldsave = PL_savestack_ix;
792b2c16 2043 STRLEN slen;
f272994b 2044 bool doutf8 = FALSE;
f8c7b90f 2045#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2046 bool is_cow;
2047#endif
a0714e2c 2048 SV *nsv = NULL;
a0d0e21e 2049
5cd24f17 2050 /* known replacement string? */
a0714e2c 2051 dstr = (pm->op_pmflags & PMf_CONST) ? POPs : NULL;
533c011a 2052 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 2053 TARG = POPs;
59f00321
RGS
2054 else if (PL_op->op_private & OPpTARGET_MY)
2055 GETTARGET;
a0d0e21e 2056 else {
54b9620d 2057 TARG = DEFSV;
a0d0e21e 2058 EXTEND(SP,1);
1c846c1f 2059 }
d9f424b2 2060
f8c7b90f 2061#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2062 /* Awooga. Awooga. "bool" types that are actually char are dangerous,
2063 because they make integers such as 256 "false". */
2064 is_cow = SvIsCOW(TARG) ? TRUE : FALSE;
2065#else
765f542d
NC
2066 if (SvIsCOW(TARG))
2067 sv_force_normal_flags(TARG,0);
ed252734
NC
2068#endif
2069 if (
f8c7b90f 2070#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2071 !is_cow &&
2072#endif
2073 (SvREADONLY(TARG)
4ce457a6
TP
2074 || ( (SvTYPE(TARG) == SVt_PVGV || SvTYPE(TARG) > SVt_PVLV)
2075 && !(SvTYPE(TARG) == SVt_PVGV && SvFAKE(TARG)))))
d470f89e 2076 DIE(aTHX_ PL_no_modify);
8ec5e241
NIS
2077 PUTBACK;
2078
d5263905 2079 s = SvPV_mutable(TARG, len);
68dc0745 2080 if (!SvPOKp(TARG) || SvTYPE(TARG) == SVt_PVGV)
a0d0e21e 2081 force_on_match = 1;
b3eb6a9b 2082 rxtainted = ((pm->op_pmdynflags & PMdf_TAINTED) ||
3280af22
NIS
2083 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
2084 if (PL_tainted)
b3eb6a9b 2085 rxtainted |= 2;
9212bbba 2086 TAINT_NOT;
a12c0f56 2087
a30b2f1f 2088 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 2089
a0d0e21e
LW
2090 force_it:
2091 if (!pm || !s)
2269b42e 2092 DIE(aTHX_ "panic: pp_subst");
a0d0e21e
LW
2093
2094 strend = s + len;
a30b2f1f 2095 slen = RX_MATCH_UTF8(rx) ? utf8_length((U8*)s, (U8*)strend) : len;
792b2c16
JH
2096 maxiters = 2 * slen + 10; /* We can match twice at each
2097 position, once with zero-length,
2098 second time with non-zero. */
a0d0e21e 2099
3280af22
NIS
2100 if (!rx->prelen && PL_curpm) {
2101 pm = PL_curpm;
aaa362c4 2102 rx = PM_GETRE(pm);
a0d0e21e 2103 }
22e551b9 2104 r_flags = (rx->nparens || SvTEMP(TARG) || PL_sawampersand)
ed252734 2105 ? REXEC_COPY_STR : 0;
f722798b 2106 if (SvSCREAM(TARG))
22e551b9 2107 r_flags |= REXEC_SCREAM;
7fba1cd6 2108
a0d0e21e 2109 orig = m = s;
f722798b 2110 if (rx->reganch & RE_USE_INTUIT) {
ee0b7718 2111 PL_bostr = orig;
f722798b
IZ
2112 s = CALLREG_INTUIT_START(aTHX_ rx, TARG, s, strend, r_flags, NULL);
2113
2114 if (!s)
2115 goto nope;
2116 /* How to do it in subst? */
2117/* if ( (rx->reganch & ROPT_CHECK_ALL)
1c846c1f 2118 && !PL_sawampersand
f722798b
IZ
2119 && ((rx->reganch & ROPT_NOSCAN)
2120 || !((rx->reganch & RE_INTUIT_TAIL)
2121 && (r_flags & REXEC_SCREAM))))
2122 goto yup;
2123*/
a0d0e21e 2124 }
71be2cbc
PP
2125
2126 /* only replace once? */
a0d0e21e 2127 once = !(rpm->op_pmflags & PMf_GLOBAL);
71be2cbc
PP
2128
2129 /* known replacement string? */
f272994b 2130 if (dstr) {
8514a05a
JH
2131 /* replacement needing upgrading? */
2132 if (DO_UTF8(TARG) && !doutf8) {
db79b45b 2133 nsv = sv_newmortal();
4a176938 2134 SvSetSV(nsv, dstr);
8514a05a
JH
2135 if (PL_encoding)
2136 sv_recode_to_utf8(nsv, PL_encoding);
2137 else
2138 sv_utf8_upgrade(nsv);
5c144d81 2139 c = SvPV_const(nsv, clen);
4a176938
JH
2140 doutf8 = TRUE;
2141 }
2142 else {
5c144d81 2143 c = SvPV_const(dstr, clen);
4a176938 2144 doutf8 = DO_UTF8(dstr);
8514a05a 2145 }
f272994b
A
2146 }
2147 else {
6136c704 2148 c = NULL;
f272994b
A
2149 doutf8 = FALSE;
2150 }
2151
71be2cbc 2152 /* can do inplace substitution? */
ed252734 2153 if (c
f8c7b90f 2154#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2155 && !is_cow
2156#endif
2157 && (I32)clen <= rx->minlen && (once || !(r_flags & REXEC_COPY_STR))
db79b45b
JH
2158 && !(rx->reganch & ROPT_LOOKBEHIND_SEEN)
2159 && (!doutf8 || SvUTF8(TARG))) {
f722798b
IZ
2160 if (!CALLREGEXEC(aTHX_ rx, s, strend, orig, 0, TARG, NULL,
2161 r_flags | REXEC_CHECKED))
2162 {
8ec5e241 2163 SPAGAIN;
3280af22 2164 PUSHs(&PL_sv_no);
71be2cbc
PP
2165 LEAVE_SCOPE(oldsave);
2166 RETURN;
2167 }
f8c7b90f 2168#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2169 if (SvIsCOW(TARG)) {
2170 assert (!force_on_match);
2171 goto have_a_cow;
2172 }
2173#endif
71be2cbc
PP
2174 if (force_on_match) {
2175 force_on_match = 0;
2176 s = SvPV_force(TARG, len);
2177 goto force_it;
2178 }
71be2cbc 2179 d = s;
3280af22 2180 PL_curpm = pm;
71be2cbc
PP
2181 SvSCREAM_off(TARG); /* disable possible screamer */
2182 if (once) {
48c036b1 2183 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d
IZ
2184 m = orig + rx->startp[0];
2185 d = orig + rx->endp[0];
71be2cbc
PP
2186 s = orig;
2187 if (m - s > strend - d) { /* faster to shorten from end */
2188 if (clen) {
2189 Copy(c, m, clen, char);
2190 m += clen;
a0d0e21e 2191 }
71be2cbc
PP
2192 i = strend - d;
2193 if (i > 0) {
2194 Move(d, m, i, char);
2195 m += i;
a0d0e21e 2196 }
71be2cbc
PP
2197 *m = '\0';
2198 SvCUR_set(TARG, m - s);
2199 }
155aba94 2200 else if ((i = m - s)) { /* faster from front */
71be2cbc
PP
2201 d -= clen;
2202 m = d;
2203 sv_chop(TARG, d-i);
2204 s += i;
2205 while (i--)
2206 *--d = *--s;
2207 if (clen)
2208 Copy(c, m, clen, char);
2209 }
2210 else if (clen) {
2211 d -= clen;
2212 sv_chop(TARG, d);
2213 Copy(c, d, clen, char);
2214 }
2215 else {
2216 sv_chop(TARG, d);
2217 }
48c036b1 2218 TAINT_IF(rxtainted & 1);
8ec5e241 2219 SPAGAIN;
3280af22 2220 PUSHs(&PL_sv_yes);
71be2cbc
PP
2221 }
2222 else {
71be2cbc
PP
2223 do {
2224 if (iters++ > maxiters)
cea2e8a9 2225 DIE(aTHX_ "Substitution loop");
d9f97599 2226 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d 2227 m = rx->startp[0] + orig;
155aba94 2228 if ((i = m - s)) {
71be2cbc
PP
2229 if (s != d)
2230 Move(s, d, i, char);
2231 d += i;
a0d0e21e 2232 }
71be2cbc
PP
2233 if (clen) {
2234 Copy(c, d, clen, char);
2235 d += clen;
2236 }
cf93c79d 2237 s = rx->endp[0] + orig;
cea2e8a9 2238 } while (CALLREGEXEC(aTHX_ rx, s, strend, orig, s == m,
f722798b
IZ
2239 TARG, NULL,
2240 /* don't match same null twice */
2241 REXEC_NOT_FIRST|REXEC_IGNOREPOS));
71be2cbc
PP
2242 if (s != d) {
2243 i = strend - s;
aa07b2f6 2244 SvCUR_set(TARG, d - SvPVX_const(TARG) + i);
71be2cbc 2245 Move(s, d, i+1, char); /* include the NUL */
a0d0e21e 2246 }
48c036b1 2247 TAINT_IF(rxtainted & 1);
8ec5e241 2248 SPAGAIN;
71be2cbc 2249 PUSHs(sv_2mortal(newSViv((I32)iters)));
a0d0e21e 2250 }
80b498e0 2251 (void)SvPOK_only_UTF8(TARG);
48c036b1 2252 TAINT_IF(rxtainted);
8ec5e241
NIS
2253 if (SvSMAGICAL(TARG)) {
2254 PUTBACK;
2255 mg_set(TARG);
2256 SPAGAIN;
2257 }
9212bbba 2258 SvTAINT(TARG);
aefe6dfc
JH
2259 if (doutf8)
2260 SvUTF8_on(TARG);
71be2cbc
PP
2261 LEAVE_SCOPE(oldsave);
2262 RETURN;
a0d0e21e 2263 }
71be2cbc 2264
f722798b
IZ
2265 if (CALLREGEXEC(aTHX_ rx, s, strend, orig, 0, TARG, NULL,
2266 r_flags | REXEC_CHECKED))
2267 {
a0d0e21e
LW
2268 if (force_on_match) {
2269 force_on_match = 0;
2270 s = SvPV_force(TARG, len);
2271 goto force_it;
2272 }
f8c7b90f 2273#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2274 have_a_cow:
2275#endif
48c036b1 2276 rxtainted |= RX_MATCH_TAINTED(rx);
f2b990bf 2277 dstr = newSVpvn(m, s-m);
ffc61ed2
JH
2278 if (DO_UTF8(TARG))
2279 SvUTF8_on(dstr);
3280af22 2280 PL_curpm = pm;
a0d0e21e 2281 if (!c) {
c09156bb 2282 register PERL_CONTEXT *cx;
8ec5e241 2283 SPAGAIN;
454f1e26 2284 (void)ReREFCNT_inc(rx);
a0d0e21e
LW
2285 PUSHSUBST(cx);
2286 RETURNOP(cPMOP->op_pmreplroot);
2287 }
cf93c79d 2288 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
2289 do {
2290 if (iters++ > maxiters)
cea2e8a9 2291 DIE(aTHX_ "Substitution loop");
d9f97599 2292 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d 2293 if (RX_MATCH_COPIED(rx) && rx->subbeg != orig) {
a0d0e21e
LW
2294 m = s;
2295 s = orig;
cf93c79d 2296 orig = rx->subbeg;
a0d0e21e
LW
2297 s = orig + (m - s);
2298 strend = s + (strend - m);
2299 }
cf93c79d 2300 m = rx->startp[0] + orig;
db79b45b
JH
2301 if (doutf8 && !SvUTF8(dstr))
2302 sv_catpvn_utf8_upgrade(dstr, s, m - s, nsv);
2303 else
2304 sv_catpvn(dstr, s, m-s);
cf93c79d 2305 s = rx->endp[0] + orig;
a0d0e21e
LW
2306 if (clen)
2307 sv_catpvn(dstr, c, clen);
2308 if (once)
2309 break;
ffc61ed2
JH
2310 } while (CALLREGEXEC(aTHX_ rx, s, strend, orig, s == m,
2311 TARG, NULL, r_flags));
db79b45b
JH
2312 if (doutf8 && !DO_UTF8(TARG))
2313 sv_catpvn_utf8_upgrade(dstr, s, strend - s, nsv);
89afcb60
A
2314 else
2315 sv_catpvn(dstr, s, strend - s);
748a9306 2316
f8c7b90f 2317#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2318 /* The match may make the string COW. If so, brilliant, because that's
2319 just saved us one malloc, copy and free - the regexp has donated
2320 the old buffer, and we malloc an entirely new one, rather than the
2321 regexp malloc()ing a buffer and copying our original, only for
2322 us to throw it away here during the substitution. */
2323 if (SvIsCOW(TARG)) {
2324 sv_force_normal_flags(TARG, SV_COW_DROP_PV);
2325 } else
2326#endif
2327 {
8bd4d4c5 2328 SvPV_free(TARG);
ed252734 2329 }
f880fe2f 2330 SvPV_set(TARG, SvPVX(dstr));
748a9306
LW
2331 SvCUR_set(TARG, SvCUR(dstr));
2332 SvLEN_set(TARG, SvLEN(dstr));
f272994b 2333 doutf8 |= DO_UTF8(dstr);
6136c704 2334 SvPV_set(dstr, NULL);
748a9306
LW
2335 sv_free(dstr);
2336
48c036b1 2337 TAINT_IF(rxtainted & 1);
f878fbec 2338 SPAGAIN;
48c036b1
GS
2339 PUSHs(sv_2mortal(newSViv((I32)iters)));
2340
a0d0e21e 2341 (void)SvPOK_only(TARG);
f272994b 2342 if (doutf8)
60aeb6fd 2343 SvUTF8_on(TARG);
48c036b1 2344 TAINT_IF(rxtainted);
a0d0e21e 2345 SvSETMAGIC(TARG);
9212bbba 2346 SvTAINT(TARG);
4633a7c4 2347 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2348 RETURN;
2349 }
5cd24f17 2350 goto ret_no;
a0d0e21e
LW
2351
2352nope:
1c846c1f 2353ret_no:
8ec5e241 2354 SPAGAIN;
3280af22 2355 PUSHs(&PL_sv_no);
4633a7c4 2356 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2357 RETURN;
2358}
2359
2360PP(pp_grepwhile)
2361{
27da23d5 2362 dVAR; dSP;
a0d0e21e
LW
2363
2364 if (SvTRUEx(POPs))
3280af22
NIS
2365 PL_stack_base[PL_markstack_ptr[-1]++] = PL_stack_base[*PL_markstack_ptr];
2366 ++*PL_markstack_ptr;
a0d0e21e
LW
2367 LEAVE; /* exit inner scope */
2368
2369 /* All done yet? */
3280af22 2370 if (PL_stack_base + *PL_markstack_ptr > SP) {
a0d0e21e 2371 I32 items;
c4420975 2372 const I32 gimme = GIMME_V;
a0d0e21e
LW
2373
2374 LEAVE; /* exit outer scope */
2375 (void)POPMARK; /* pop src */
3280af22 2376 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 2377 (void)POPMARK; /* pop dst */
3280af22 2378 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 2379 if (gimme == G_SCALAR) {
7cc47870 2380 if (PL_op->op_private & OPpGREP_LEX) {
c4420975 2381 SV* const sv = sv_newmortal();
7cc47870
RGS
2382 sv_setiv(sv, items);
2383 PUSHs(sv);
2384 }
2385 else {
2386 dTARGET;
2387 XPUSHi(items);
2388 }
a0d0e21e 2389 }
54310121
PP
2390 else if (gimme == G_ARRAY)
2391 SP += items;
a0d0e21e
LW
2392 RETURN;
2393 }
2394 else {
2395 SV *src;
2396
2397 ENTER; /* enter inner scope */
1d7c1841 2398 SAVEVPTR(PL_curpm);
a0d0e21e 2399
3280af22 2400 src = PL_stack_base[*PL_markstack_ptr];
a0d0e21e 2401 SvTEMP_off(src);
59f00321
RGS
2402 if (PL_op->op_private & OPpGREP_LEX)
2403 PAD_SVl(PL_op->op_targ) = src;
2404 else
2405 DEFSV = src;
a0d0e21e
LW
2406
2407 RETURNOP(cLOGOP->op_other);
2408 }
2409}
2410
2411PP(pp_leavesub)
2412{
27da23d5 2413 dVAR; dSP;
a0d0e21e
LW
2414 SV **mark;
2415 SV **newsp;
2416 PMOP *newpm;
2417 I32 gimme;
c09156bb 2418 register PERL_CONTEXT *cx;
b0d9ce38 2419 SV *sv;
a0d0e21e 2420
9850bf21
RH
2421 if (CxMULTICALL(&cxstack[cxstack_ix]))
2422 return 0;
2423
a0d0e21e 2424 POPBLOCK(cx,newpm);
5dd42e15 2425 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2426
a1f49e72 2427 TAINT_NOT;
a0d0e21e
LW
2428 if (gimme == G_SCALAR) {
2429 MARK = newsp + 1;
a29cdaf0 2430 if (MARK <= SP) {
a8bba7fa 2431 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
a29cdaf0
IZ
2432 if (SvTEMP(TOPs)) {
2433 *MARK = SvREFCNT_inc(TOPs);
2434 FREETMPS;
2435 sv_2mortal(*MARK);
cd06dffe
GS
2436 }
2437 else {
959e3673 2438 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
a29cdaf0 2439 FREETMPS;
959e3673
GS
2440 *MARK = sv_mortalcopy(sv);
2441 SvREFCNT_dec(sv);
a29cdaf0 2442 }
cd06dffe
GS
2443 }
2444 else
a29cdaf0 2445 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
cd06dffe
GS
2446 }
2447 else {
f86702cc 2448 MEXTEND(MARK, 0);
3280af22 2449 *MARK = &PL_sv_undef;
a0d0e21e
LW
2450 }
2451 SP = MARK;
2452 }
54310121 2453 else if (gimme == G_ARRAY) {
f86702cc 2454 for (MARK = newsp + 1; MARK <= SP; MARK++) {
a1f49e72 2455 if (!SvTEMP(*MARK)) {
f86702cc 2456 *MARK = sv_mortalcopy(*MARK);
a1f49e72
CS
2457 TAINT_NOT; /* Each item is independent */
2458 }
f86702cc 2459 }
a0d0e21e 2460 }
f86702cc 2461 PUTBACK;
1c846c1f 2462
5dd42e15
DM
2463 LEAVE;
2464 cxstack_ix--;
b0d9ce38 2465 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
3280af22 2466 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e 2467
b0d9ce38 2468 LEAVESUB(sv);
f39bc417 2469 return cx->blk_sub.retop;
a0d0e21e
LW
2470}
2471
cd06dffe
GS
2472/* This duplicates the above code because the above code must not
2473 * get any slower by more conditions */
2474PP(pp_leavesublv)
2475{
27da23d5 2476 dVAR; dSP;
cd06dffe
GS
2477 SV **mark;
2478 SV **newsp;
2479 PMOP *newpm;
2480 I32 gimme;
2481 register PERL_CONTEXT *cx;
b0d9ce38 2482 SV *sv;
cd06dffe 2483
9850bf21
RH
2484 if (CxMULTICALL(&cxstack[cxstack_ix]))
2485 return 0;
2486
cd06dffe 2487 POPBLOCK(cx,newpm);
5dd42e15 2488 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2489
cd06dffe
GS
2490 TAINT_NOT;
2491
2492 if (cx->blk_sub.lval & OPpENTERSUB_INARGS) {
2493 /* We are an argument to a function or grep().
2494 * This kind of lvalueness was legal before lvalue
2495 * subroutines too, so be backward compatible:
2496 * cannot report errors. */
2497
2498 /* Scalar context *is* possible, on the LHS of -> only,
2499 * as in f()->meth(). But this is not an lvalue. */
2500 if (gimme == G_SCALAR)
2501 goto temporise;
2502 if (gimme == G_ARRAY) {
a8bba7fa 2503 if (!CvLVALUE(cx->blk_sub.cv))
cd06dffe
GS
2504 goto temporise_array;
2505 EXTEND_MORTAL(SP - newsp);
2506 for (mark = newsp + 1; mark <= SP; mark++) {
2507 if (SvTEMP(*mark))
bb263b4e 2508 /*EMPTY*/;
cd06dffe
GS
2509 else if (SvFLAGS(*mark) & (SVs_PADTMP | SVf_READONLY))
2510 *mark = sv_mortalcopy(*mark);
2511 else {
2512 /* Can be a localized value subject to deletion. */
2513 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2514 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2515 }
2516 }
2517 }
2518 }
2519 else if (cx->blk_sub.lval) { /* Leave it as it is if we can. */
2520 /* Here we go for robustness, not for speed, so we change all
2521 * the refcounts so the caller gets a live guy. Cannot set
2522 * TEMP, so sv_2mortal is out of question. */
a8bba7fa 2523 if (!CvLVALUE(cx->blk_sub.cv)) {
5dd42e15
DM
2524 LEAVE;
2525 cxstack_ix--;
b0d9ce38 2526 POPSUB(cx,sv);
d470f89e 2527 PL_curpm = newpm;
b0d9ce38 2528 LEAVESUB(sv);
d470f89e
GS
2529 DIE(aTHX_ "Can't modify non-lvalue subroutine call");
2530 }
cd06dffe
GS
2531 if (gimme == G_SCALAR) {
2532 MARK = newsp + 1;
2533 EXTEND_MORTAL(1);
2534 if (MARK == SP) {
f9bc45ef
TP
2535 /* Temporaries are bad unless they happen to be elements
2536 * of a tied hash or array */
2537 if (SvFLAGS(TOPs) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY) &&
2538 !(SvRMAGICAL(TOPs) && mg_find(TOPs, PERL_MAGIC_tiedelem))) {
5dd42e15
DM
2539 LEAVE;
2540 cxstack_ix--;
b0d9ce38 2541 POPSUB(cx,sv);
d470f89e 2542 PL_curpm = newpm;
b0d9ce38 2543 LEAVESUB(sv);
e9f19e3c
HS
2544 DIE(aTHX_ "Can't return %s from lvalue subroutine",
2545 SvREADONLY(TOPs) ? (TOPs == &PL_sv_undef) ? "undef"
2546 : "a readonly value" : "a temporary");
d470f89e 2547 }
cd06dffe
GS
2548 else { /* Can be a localized value
2549 * subject to deletion. */
2550 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2551 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2552 }
2553 }
d470f89e 2554 else { /* Should not happen? */
5dd42e15
DM
2555 LEAVE;
2556 cxstack_ix--;
b0d9ce38 2557 POPSUB(cx,sv);
d470f89e 2558 PL_curpm = newpm;
b0d9ce38 2559 LEAVESUB(sv);
d470f89e 2560 DIE(aTHX_ "%s returned from lvalue subroutine in scalar context",
cd06dffe 2561 (MARK > SP ? "Empty array" : "Array"));
d470f89e 2562 }
cd06dffe
GS
2563 SP = MARK;
2564 }
2565 else if (gimme == G_ARRAY) {
2566 EXTEND_MORTAL(SP - newsp);
2567 for (mark = newsp + 1; mark <= SP; mark++) {
f206cdda
AMS
2568 if (*mark != &PL_sv_undef
2569 && SvFLAGS(*mark) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
d470f89e
GS
2570 /* Might be flattened array after $#array = */
2571 PUTBACK;
5dd42e15
DM
2572 LEAVE;
2573 cxstack_ix--;
b0d9ce38 2574 POPSUB(cx,sv);
d470f89e 2575 PL_curpm = newpm;
b0d9ce38 2576 LEAVESUB(sv);
f206cdda
AMS
2577 DIE(aTHX_ "Can't return a %s from lvalue subroutine",
2578 SvREADONLY(TOPs) ? "readonly value" : "temporary");
d470f89e 2579 }
cd06dffe 2580 else {
cd06dffe
GS
2581 /* Can be a localized value subject to deletion. */
2582 PL_tmps_stack[++PL_tmps_ix] = *mark;
e1f15930 2583 (void)SvREFCNT_inc(*mark);
cd06dffe
GS
2584 }
2585 }
2586 }
2587 }
2588 else {
2589 if (gimme == G_SCALAR) {
2590 temporise:
2591 MARK = newsp + 1;
2592 if (MARK <= SP) {
a8bba7fa 2593 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
cd06dffe
GS
2594 if (SvTEMP(TOPs)) {
2595 *MARK = SvREFCNT_inc(TOPs);
2596 FREETMPS;
2597 sv_2mortal(*MARK);
2598 }
2599 else {
959e3673 2600 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
cd06dffe 2601 FREETMPS;
959e3673
GS
2602 *MARK = sv_mortalcopy(sv);
2603 SvREFCNT_dec(sv);
cd06dffe
GS
2604 }
2605 }
2606 else
2607 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
2608 }
2609 else {
2610 MEXTEND(MARK, 0);
2611 *MARK = &PL_sv_undef;
2612 }
2613 SP = MARK;
2614 }
2615 else if (gimme == G_ARRAY) {
2616 temporise_array:
2617 for (MARK = newsp + 1; MARK <= SP; MARK++) {
2618 if (!SvTEMP(*MARK)) {
2619 *MARK = sv_mortalcopy(*MARK);
2620 TAINT_NOT; /* Each item is independent */
2621 }
2622 }
2623 }
2624 }
2625 PUTBACK;
1c846c1f 2626
5dd42e15
DM
2627 LEAVE;
2628 cxstack_ix--;
b0d9ce38 2629 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
cd06dffe
GS
2630 PL_curpm = newpm; /* ... and pop $1 et al */
2631
b0d9ce38 2632 LEAVESUB(sv);
f39bc417 2633 return cx->blk_sub.retop;
cd06dffe
GS
2634}
2635
2636
76e3520e 2637STATIC CV *
cea2e8a9 2638S_get_db_sub(pTHX_ SV **svp, CV *cv)
3de9ffa1 2639{
97aff369 2640 dVAR;
0bcc34c2 2641 SV * const dbsv = GvSVn(PL_DBsub);
491527d0 2642
f398eb67 2643 save_item(dbsv);
491527d0
GS
2644 if (!PERLDB_SUB_NN) {
2645 GV *gv = CvGV(cv);
2646
491527d0 2647 if ( (CvFLAGS(cv) & (CVf_ANON | CVf_CLONED))
1c846c1f 2648 || strEQ(GvNAME(gv), "END")
491527d0
GS
2649 || ((GvCV(gv) != cv) && /* Could be imported, and old sub redefined. */
2650 !( (SvTYPE(*svp) == SVt_PVGV) && (GvCV((GV*)*svp) == cv)
2651 && (gv = (GV*)*svp) ))) {
2652 /* Use GV from the stack as a fallback. */
2653 /* GV is potentially non-unique, or contain different CV. */
823a54a3 2654 SV * const tmp = newRV((SV*)cv);
c2e66d9e
GS
2655 sv_setsv(dbsv, tmp);
2656 SvREFCNT_dec(tmp);
491527d0
GS
2657 }
2658 else {
6136c704 2659 gv_efullname3(dbsv, gv, NULL);
491527d0 2660 }
3de9ffa1
MB
2661 }
2662 else {
a9c4fd4e 2663 const int type = SvTYPE(dbsv);
f398eb67
NC
2664 if (type < SVt_PVIV && type != SVt_IV)
2665 sv_upgrade(dbsv, SVt_PVIV);
155aba94 2666 (void)SvIOK_on(dbsv);
45977657 2667 SvIV_set(dbsv, PTR2IV(cv)); /* Do it the quickest way */
3de9ffa1 2668 }
491527d0 2669
3de9ffa1 2670 if (CvXSUB(cv))
3280af22
NIS
2671 PL_curcopdb = PL_curcop;
2672 cv = GvCV(PL_DBsub);
3de9ffa1
MB
2673 return cv;
2674}
2675
a0d0e21e
LW
2676PP(pp_entersub)
2677{
27da23d5 2678 dVAR; dSP; dPOPss;
a0d0e21e 2679 GV *gv;
a0d0e21e 2680 register CV *cv;
c09156bb 2681 register PERL_CONTEXT *cx;
5d94fbed 2682 I32 gimme;
a9c4fd4e 2683 const bool hasargs = (PL_op->op_flags & OPf_STACKED) != 0;
a0d0e21e
LW
2684
2685 if (!sv)
cea2e8a9 2686 DIE(aTHX_ "Not a CODE reference");
a0d0e21e 2687 switch (SvTYPE(sv)) {
f1025168
NC
2688 /* This is overwhelming the most common case: */
2689 case SVt_PVGV:
f730a42d
NC
2690 if (!(cv = GvCVu((GV*)sv))) {
2691 HV *stash;
f2c0649b 2692 cv = sv_2cv(sv, &stash, &gv, 0);
f730a42d 2693 }
f1025168
NC
2694 if (!cv) {
2695 ENTER;
2696 SAVETMPS;
2697 goto try_autoload;
2698 }
2699 break;
a0d0e21e
LW
2700 default:
2701 if (!SvROK(sv)) {
a9c4fd4e 2702 const char *sym;
3280af22 2703 if (sv == &PL_sv_yes) { /* unfound import, ignore */
fb73857a 2704 if (hasargs)
3280af22 2705 SP = PL_stack_base + POPMARK;
a0d0e21e 2706 RETURN;
fb73857a 2707 }
15ff848f
CS
2708 if (SvGMAGICAL(sv)) {
2709 mg_get(sv);
f5f1d18e
AMS
2710 if (SvROK(sv))
2711 goto got_rv;
6136c704 2712 sym = SvPOKp(sv) ? SvPVX_const(sv) : NULL;
15ff848f 2713 }
a9c4fd4e 2714 else {
8b6b16e7 2715 sym = SvPV_nolen_const(sv);
a9c4fd4e 2716 }
15ff848f 2717 if (!sym)
cea2e8a9 2718 DIE(aTHX_ PL_no_usym, "a subroutine");
533c011a 2719 if (PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 2720 DIE(aTHX_ PL_no_symref, sym, "a subroutine");
864dbfa3 2721 cv = get_cv(sym, TRUE);
a0d0e21e
LW
2722 break;
2723 }
f5f1d18e 2724 got_rv:
f5284f61 2725 {
823a54a3 2726 SV * const * sp = &sv; /* Used in tryAMAGICunDEREF macro. */
f5284f61
IZ
2727 tryAMAGICunDEREF(to_cv);
2728 }
a0d0e21e
LW
2729 cv = (CV*)SvRV(sv);
2730 if (SvTYPE(cv) == SVt_PVCV)
2731 break;
2732 /* FALL THROUGH */
2733 case SVt_PVHV:
2734 case SVt_PVAV:
cea2e8a9 2735 DIE(aTHX_ "Not a CODE reference");
f1025168 2736 /* This is the second most common case: */
a0d0e21e
LW
2737 case SVt_PVCV:
2738 cv = (CV*)sv;
2739 break;
a0d0e21e
LW
2740 }
2741
2742 ENTER;
2743 SAVETMPS;
2744
2745 retry:
a0d0e21e 2746 if (!CvROOT(cv) && !CvXSUB(cv)) {
2f349aa0
NC
2747 GV* autogv;
2748 SV* sub_name;
2749
2750 /* anonymous or undef'd function leaves us no recourse */
2751 if (CvANON(cv) || !(gv = CvGV(cv)))
2752 DIE(aTHX_ "Undefined subroutine called");
2753
2754 /* autoloaded stub? */
2755 if (cv != GvCV(gv)) {
2756 cv = GvCV(gv);
2757 }
2758 /* should call AUTOLOAD now? */
2759 else {
2760try_autoload:
2761 if ((autogv = gv_autoload4(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv),
2762 FALSE)))
2763 {
2764 cv = GvCV(autogv);
2765 }
2766 /* sorry */
2767 else {
2768 sub_name = sv_newmortal();
6136c704 2769 gv_efullname3(sub_name, gv, NULL);
2f349aa0
NC
2770 DIE(aTHX_ "Undefined subroutine &%"SVf" called", sub_name);
2771 }
2772 }
2773 if (!cv)
2774 DIE(aTHX_ "Not a CODE reference");
2775 goto retry;
a0d0e21e
LW
2776 }
2777
54310121 2778 gimme = GIMME_V;
67caa1fe 2779 if ((PL_op->op_private & OPpENTERSUB_DB) && GvCV(PL_DBsub) && !CvNODEBUG(cv)) {
06492da6
SF
2780 if (CvASSERTION(cv) && PL_DBassertion)
2781 sv_setiv(PL_DBassertion, 1);
2782
4f01c5a5 2783 cv = get_db_sub(&sv, cv);
ccafdc96
RGS
2784 if (!cv || (!CvXSUB(cv) && !CvSTART(cv)))
2785 DIE(aTHX_ "No DB::sub routine defined");
67caa1fe 2786 }
a0d0e21e 2787
f1025168
NC
2788 if (!(CvXSUB(cv))) {
2789 /* This path taken at least 75% of the time */
a0d0e21e
LW
2790 dMARK;
2791 register I32 items = SP - MARK;
0bcc34c2 2792 AV* const padlist = CvPADLIST(cv);
a0d0e21e
LW
2793 PUSHBLOCK(cx, CXt_SUB, MARK);
2794 PUSHSUB(cx);
f39bc417 2795 cx->blk_sub.retop = PL_op->op_next;
a0d0e21e 2796 CvDEPTH(cv)++;
6b35e009
GS
2797 /* XXX This would be a natural place to set C<PL_compcv = cv> so
2798 * that eval'' ops within this sub know the correct lexical space.
a3985cdc
DM
2799 * Owing the speed considerations, we choose instead to search for
2800 * the cv using find_runcv() when calling doeval().
6b35e009 2801 */
b36bdeca 2802 if (CvDEPTH(cv) >= 2) {
1d7c1841 2803 PERL_STACK_OVERFLOW_CHECK();
26019298 2804 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2805 }
9320a037
DM
2806 SAVECOMPPAD();
2807 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
6d4ff0d2 2808 if (hasargs)
6d4ff0d2 2809 {
0bcc34c2 2810 AV* const av = (AV*)PAD_SVl(0);
221373f0
GS
2811 if (AvREAL(av)) {
2812 /* @_ is normally not REAL--this should only ever
2813 * happen when DB::sub() calls things that modify @_ */
2814 av_clear(av);
2815 AvREAL_off(av);
2816 AvREIFY_on(av);
2817 }
3280af22
NIS
2818 cx->blk_sub.savearray = GvAV(PL_defgv);
2819 GvAV(PL_defgv) = (AV*)SvREFCNT_inc(av);
dd2155a4 2820 CX_CURPAD_SAVE(cx->blk_sub);
6d4ff0d2 2821 cx->blk_sub.argarray = av;
a0d0e21e
LW
2822 ++MARK;
2823
2824 if (items > AvMAX(av) + 1) {
504618e9 2825 SV **ary = AvALLOC(av);
a0d0e21e
LW
2826 if (AvARRAY(av) != ary) {
2827 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
f880fe2f 2828 SvPV_set(av, (char*)ary);
a0d0e21e
LW
2829 }
2830 if (items > AvMAX(av) + 1) {
2831 AvMAX(av) = items - 1;
2832 Renew(ary,items,SV*);
2833 AvALLOC(av) = ary;
f880fe2f 2834 SvPV_set(av, (char*)ary);
a0d0e21e
LW
2835 }
2836 }
2837 Copy(MARK,AvARRAY(av),items,SV*);
93965878 2838 AvFILLp(av) = items - 1;
1c846c1f 2839
a0d0e21e
LW
2840 while (items--) {
2841 if (*MARK)
2842 SvTEMP_off(*MARK);
2843 MARK++;
2844 }
2845 }
4a925ff6
GS
2846 /* warning must come *after* we fully set up the context
2847 * stuff so that __WARN__ handlers can safely dounwind()
2848 * if they want to
2849 */
2850 if (CvDEPTH(cv) == 100 && ckWARN(WARN_RECURSION)
2851 && !(PERLDB_SUB && cv == GvCV(PL_DBsub)))
2852 sub_crush_depth(cv);
77a005ab 2853#if 0
bf49b057 2854 DEBUG_S(PerlIO_printf(Perl_debug_log,
0f15f207 2855 "%p entersub returning %p\n", thr, CvSTART(cv)));
77a005ab 2856#endif
a0d0e21e
LW
2857 RETURNOP(CvSTART(cv));
2858 }
f1025168
NC
2859 else {
2860#ifdef PERL_XSUB_OLDSTYLE
2861 if (CvOLDSTYLE(cv)) {
2862 I32 (*fp3)(int,int,int);
2863 dMARK;
2864 register I32 items = SP - MARK;
2865 /* We dont worry to copy from @_. */
2866 while (SP > mark) {
2867 SP[1] = SP[0];
2868 SP--;
2869 }
2870 PL_stack_sp = mark + 1;
2871 fp3 = (I32(*)(int,int,int))CvXSUB(cv);
2872 items = (*fp3)(CvXSUBANY(cv).any_i32,
2873 MARK - PL_stack_base + 1,
2874 items);
2875 PL_stack_sp = PL_stack_base + items;
2876 }
2877 else
2878#endif /* PERL_XSUB_OLDSTYLE */
2879 {
2880 I32 markix = TOPMARK;
2881
2882 PUTBACK;
2883
2884 if (!hasargs) {
2885 /* Need to copy @_ to stack. Alternative may be to
2886 * switch stack to @_, and copy return values
2887 * back. This would allow popping @_ in XSUB, e.g.. XXXX */
a3b680e6
AL
2888 AV * const av = GvAV(PL_defgv);
2889 const I32 items = AvFILLp(av) + 1; /* @_ is not tieable */
f1025168
NC
2890
2891 if (items) {
2892 /* Mark is at the end of the stack. */
2893 EXTEND(SP, items);
2894 Copy(AvARRAY(av), SP + 1, items, SV*);
2895 SP += items;
2896 PUTBACK ;
2897 }
2898 }
2899 /* We assume first XSUB in &DB::sub is the called one. */
2900 if (PL_curcopdb) {
2901 SAVEVPTR(PL_curcop);
2902 PL_curcop = PL_curcopdb;
2903 PL_curcopdb = NULL;
2904 }
2905 /* Do we need to open block here? XXXX */
2906 (void)(*CvXSUB(cv))(aTHX_ cv);
2907
2908 /* Enforce some sanity in scalar context. */
2909 if (gimme == G_SCALAR && ++markix != PL_stack_sp - PL_stack_base ) {
2910 if (markix > PL_stack_sp - PL_stack_base)
2911 *(PL_stack_base + markix) = &PL_sv_undef;
2912 else
2913 *(PL_stack_base + markix) = *PL_stack_sp;
2914 PL_stack_sp = PL_stack_base + markix;
2915 }
2916 }
2917 LEAVE;
2918 return NORMAL;
2919 }
a0d0e21e
LW
2920}
2921
44a8e56a 2922void
864dbfa3 2923Perl_sub_crush_depth(pTHX_ CV *cv)
44a8e56a
PP
2924{
2925 if (CvANON(cv))
9014280d 2926 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on anonymous subroutine");
44a8e56a 2927 else {
aec46f14 2928 SV* const tmpstr = sv_newmortal();
6136c704 2929 gv_efullname3(tmpstr, CvGV(cv), NULL);
35c1215d
NC
2930 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on subroutine \"%"SVf"\"",
2931 tmpstr);
44a8e56a
PP
2932 }
2933}
2934
a0d0e21e
LW
2935PP(pp_aelem)
2936{
97aff369 2937 dVAR; dSP;
a0d0e21e 2938 SV** svp;
a3b680e6 2939 SV* const elemsv = POPs;
d804643f 2940 IV elem = SvIV(elemsv);
0bcc34c2 2941 AV* const av = (AV*)POPs;
e1ec3a88
AL
2942 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
2943 const U32 defer = (PL_op->op_private & OPpLVAL_DEFER) && (elem > av_len(av));
be6c24e0 2944 SV *sv;
a0d0e21e 2945
e35c1634 2946 if (SvROK(elemsv) && !SvGAMAGIC(elemsv) && ckWARN(WARN_MISC))
35c1215d 2947 Perl_warner(aTHX_ packWARN(WARN_MISC), "Use of reference \"%"SVf"\" as array index", elemsv);
748a9306 2948 if (elem > 0)
3280af22 2949 elem -= PL_curcop->cop_arybase;
a0d0e21e
LW
2950 if (SvTYPE(av) != SVt_PVAV)
2951 RETPUSHUNDEF;
68dc0745 2952 svp = av_fetch(av, elem, lval && !defer);
a0d0e21e 2953 if (lval) {
2b573ace 2954#ifdef PERL_MALLOC_WRAP
2b573ace 2955 if (SvUOK(elemsv)) {
a9c4fd4e 2956 const UV uv = SvUV(elemsv);
2b573ace
JH
2957 elem = uv > IV_MAX ? IV_MAX : uv;
2958 }
2959 else if (SvNOK(elemsv))
2960 elem = (IV)SvNV(elemsv);
a3b680e6
AL
2961 if (elem > 0) {
2962 static const char oom_array_extend[] =
2963 "Out of memory during array extend"; /* Duplicated in av.c */
2b573ace 2964 MEM_WRAP_CHECK_1(elem,SV*,oom_array_extend);
a3b680e6 2965 }
2b573ace 2966#endif
3280af22 2967 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
2968 SV* lv;
2969 if (!defer)
cea2e8a9 2970 DIE(aTHX_ PL_no_aelem, elem);
68dc0745
PP
2971 lv = sv_newmortal();
2972 sv_upgrade(lv, SVt_PVLV);
2973 LvTYPE(lv) = 'y';
a0714e2c 2974 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
68dc0745
PP
2975 LvTARG(lv) = SvREFCNT_inc(av);
2976 LvTARGOFF(lv) = elem;
2977 LvTARGLEN(lv) = 1;
2978 PUSHs(lv);
2979 RETURN;
2980 }
bfc4de9f 2981 if (PL_op->op_private & OPpLVAL_INTRO)
161b7d16 2982 save_aelem(av, elem, svp);
533c011a
NIS
2983 else if (PL_op->op_private & OPpDEREF)
2984 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 2985 }
3280af22 2986 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
2987 if (!lval && SvGMAGICAL(sv)) /* see note in pp_helem() */
2988 sv = sv_mortalcopy(sv);
2989 PUSHs(sv);
a0d0e21e
LW
2990 RETURN;
2991}
2992
02a9e968 2993void
864dbfa3 2994Perl_vivify_ref(pTHX_ SV *sv, U32 to_what)
02a9e968 2995{
5b295bef 2996 SvGETMAGIC(sv);
02a9e968
CS
2997 if (!SvOK(sv)) {
2998 if (SvREADONLY(sv))
cea2e8a9 2999 Perl_croak(aTHX_ PL_no_modify);
5f05dabc
PP
3000 if (SvTYPE(sv) < SVt_RV)
3001 sv_upgrade(sv, SVt_RV);
3002 else if (SvTYPE(sv) >= SVt_PV) {
8bd4d4c5 3003 SvPV_free(sv);
b162af07
SP
3004 SvLEN_set(sv, 0);
3005 SvCUR_set(sv, 0);
5f05dabc 3006 }
68dc0745 3007 switch (to_what) {
5f05dabc 3008 case OPpDEREF_SV:
561b68a9 3009 SvRV_set(sv, newSV(0));
5f05dabc
PP
3010 break;
3011 case OPpDEREF_AV:
b162af07 3012 SvRV_set(sv, (SV*)newAV());
5f05dabc
PP
3013 break;
3014 case OPpDEREF_HV:
b162af07 3015 SvRV_set(sv, (SV*)newHV());
5f05dabc
PP
3016 break;
3017 }
02a9e968
CS
3018 SvROK_on(sv);
3019 SvSETMAGIC(sv);
3020 }
3021}
3022
a0d0e21e
LW
3023PP(pp_method)
3024{
97aff369 3025 dVAR; dSP;
890ce7af 3026 SV* const sv = TOPs;
f5d5a27c
CS
3027
3028 if (SvROK(sv)) {
890ce7af 3029 SV* const rsv = SvRV(sv);
f5d5a27c
CS
3030 if (SvTYPE(rsv) == SVt_PVCV) {
3031 SETs(rsv);
3032 RETURN;
3033 }
3034 }
3035
3036 SETs(method_common(sv, Null(U32*)));
3037 RETURN;
3038}
3039
3040PP(pp_method_named)
3041{
97aff369 3042 dVAR; dSP;
890ce7af 3043 SV* const sv = cSVOP_sv;
c158a4fd 3044 U32 hash = SvSHARED_HASH(sv);
f5d5a27c
CS
3045
3046 XPUSHs(method_common(sv, &hash));
3047 RETURN;
3048}
3049
3050STATIC SV *
3051S_method_common(pTHX_ SV* meth, U32* hashp)
3052{
97aff369 3053 dVAR;
a0d0e21e
LW
3054 SV* ob;
3055 GV* gv;
56304f61 3056 HV* stash;
f5d5a27c 3057 STRLEN namelen;
6136c704 3058 const char* packname = NULL;
a0714e2c 3059 SV *packsv = NULL;
ac91690f 3060 STRLEN packlen;
46c461b5
AL
3061 const char * const name = SvPV_const(meth, namelen);
3062 SV * const sv = *(PL_stack_base + TOPMARK + 1);
f5d5a27c 3063
4f1b7578
SC
3064 if (!sv)
3065 Perl_croak(aTHX_ "Can't call method \"%s\" on an undefined value", name);
3066
5b295bef 3067 SvGETMAGIC(sv);
a0d0e21e 3068 if (SvROK(sv))
16d20bd9 3069 ob = (SV*)SvRV(sv);
a0d0e21e
LW
3070 else {
3071 GV* iogv;
a0d0e21e 3072
af09ea45 3073 /* this isn't a reference */
5c144d81 3074 if(SvOK(sv) && (packname = SvPV_const(sv, packlen))) {
b464bac0 3075 const HE* const he = hv_fetch_ent(PL_stashcache, sv, 0, 0);
081fc587 3076 if (he) {
5e6396ae 3077 stash = INT2PTR(HV*,SvIV(HeVAL(he)));
081fc587
AB
3078 goto fetch;
3079 }
3080 }
3081
a0d0e21e 3082 if (!SvOK(sv) ||
05f5af9a 3083 !(packname) ||
f776e3cd 3084 !(iogv = gv_fetchsv(sv, 0, SVt_PVIO)) ||
a0d0e21e
LW
3085 !(ob=(SV*)GvIO(iogv)))
3086 {
af09ea45 3087 /* this isn't the name of a filehandle either */
1c846c1f 3088 if (!packname ||
fd400ab9 3089 ((UTF8_IS_START(*packname) && DO_UTF8(sv))
b86a2fa7 3090 ? !isIDFIRST_utf8((U8*)packname)
834a4ddd
LW
3091 : !isIDFIRST(*packname)
3092 ))
3093 {
f5d5a27c
CS
3094 Perl_croak(aTHX_ "Can't call method \"%s\" %s", name,
3095 SvOK(sv) ? "without a package or object reference"
3096 : "on an undefined value");
834a4ddd 3097 }
af09ea45
IK
3098 /* assume it's a package name */
3099 stash = gv_stashpvn(packname, packlen, FALSE);
0dae17bd
GS
3100 if (!stash)
3101 packsv = sv;
081fc587 3102 else {
5e6396ae 3103 SV* ref = newSViv(PTR2IV(stash));
7e8961ec
AB
3104 hv_store(PL_stashcache, packname, packlen, ref, 0);
3105 }
ac91690f 3106 goto fetch;
a0d0e21e 3107 }
af09ea45 3108 /* it _is_ a filehandle name -- replace with a reference */
3280af22 3109 *(PL_stack_base + TOPMARK + 1) = sv_2mortal(newRV((SV*)iogv));
a0d0e21e
LW
3110 }
3111
af09ea45 3112 /* if we got here, ob should be a reference or a glob */
f0d43078
GS
3113 if (!ob || !(SvOBJECT(ob)
3114 || (SvTYPE(ob) == SVt_PVGV && (ob = (SV*)GvIO((GV*)ob))
3115 && SvOBJECT(ob))))
3116 {
f5d5a27c
CS
3117 Perl_croak(aTHX_ "Can't call method \"%s\" on unblessed reference",
3118 name);
f0d43078 3119 }
a0d0e21e 3120
56304f61 3121 stash = SvSTASH(ob);
a0d0e21e 3122
ac91690f 3123 fetch:
af09ea45
IK
3124 /* NOTE: stash may be null, hope hv_fetch_ent and
3125 gv_fetchmethod can cope (it seems they can) */
3126
f5d5a27c
CS
3127 /* shortcut for simple names */
3128 if (hashp) {
b464bac0 3129 const HE* const he = hv_fetch_ent(stash, meth, 0, *hashp);
f5d5a27c
CS
3130 if (he) {
3131 gv = (GV*)HeVAL(he);
3132 if (isGV(gv) && GvCV(gv) &&
3133 (!GvCVGEN(gv) || GvCVGEN(gv) == PL_sub_generation))
3134 return (SV*)GvCV(gv);
3135 }
3136 }
3137
0dae17bd 3138 gv = gv_fetchmethod(stash ? stash : (HV*)packsv, name);
af09ea45 3139
56304f61 3140 if (!gv) {
af09ea45
IK
3141 /* This code tries to figure out just what went wrong with
3142 gv_fetchmethod. It therefore needs to duplicate a lot of
3143 the internals of that function. We can't move it inside
3144 Perl_gv_fetchmethod_autoload(), however, since that would
3145 cause UNIVERSAL->can("NoSuchPackage::foo") to croak, and we
3146 don't want that.
3147 */
a9c4fd4e 3148 const char* leaf = name;
6136c704 3149 const char* sep = NULL;
a9c4fd4e 3150 const char* p;
56304f61
CS
3151
3152 for (p = name; *p; p++) {
3153 if (*p == '\'')
3154 sep = p, leaf = p + 1;
3155 else if (*p == ':' && *(p + 1) == ':')
3156 sep = p, leaf = p + 2;
3157 }
3158 if (!sep || ((sep - name) == 5 && strnEQ(name, "SUPER", 5))) {
9b9d0b15
NC
3159 /* the method name is unqualified or starts with SUPER:: */
3160 bool need_strlen = 1;
3161 if (sep) {
3162 packname = CopSTASHPV(PL_curcop);
3163 }
3164 else if (stash) {
46c461b5 3165 HEK * const packhek = HvNAME_HEK(stash);
9b9d0b15
NC
3166 if (packhek) {
3167 packname = HEK_KEY(packhek);
3168 packlen = HEK_LEN(packhek);
3169 need_strlen = 0;
3170 } else {
3171 goto croak;
3172 }
3173 }
3174
3175 if (!packname) {
3176 croak:
e27ad1f2
AV
3177 Perl_croak(aTHX_
3178 "Can't use anonymous symbol table for method lookup");
9b9d0b15
NC
3179 }
3180 else if (need_strlen)
e27ad1f2 3181 packlen = strlen(packname);
9b9d0b15 3182
56304f61
CS
3183 }
3184 else {
af09ea45 3185 /* the method name is qualified */
56304f61
CS
3186 packname = name;
3187 packlen = sep - name;
3188 }
af09ea45
IK
3189
3190 /* we're relying on gv_fetchmethod not autovivifying the stash */
3191 if (gv_stashpvn(packname, packlen, FALSE)) {
c1899e02 3192 Perl_croak(aTHX_
af09ea45
IK
3193 "Can't locate object method \"%s\" via package \"%.*s\"",
3194 leaf, (int)packlen, packname);
c1899e02
GS
3195 }
3196 else {
3197 Perl_croak(aTHX_
af09ea45
IK
3198 "Can't locate object method \"%s\" via package \"%.*s\""
3199 " (perhaps you forgot to load \"%.*s\"?)",
3200 leaf, (int)packlen, packname, (int)packlen, packname);
c1899e02 3201 }
56304f61 3202 }
f5d5a27c 3203 return isGV(gv) ? (SV*)GvCV(gv) : (SV*)gv;
a0d0e21e 3204}
241d1a3b
NC
3205
3206/*
3207 * Local variables:
3208 * c-indentation-style: bsd
3209 * c-basic-offset: 4
3210 * indent-tabs-mode: t
3211 * End:
3212 *
37442d52
RGS
3213 * ex: set ts=8 sts=4 sw=4 noet:
3214 */