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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,
fdf8c088 4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 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 }
952306ac
RGS
123 else if (PL_op->op_private & OPpASSIGN_STATE) {
124 if (SvPADSTALE(right))
125 SvPADSTALE_off(right);
126 else
127 RETURN; /* ignore assignment */
128 }
3280af22 129 if (PL_tainting && PL_tainted && !SvTAINTED(left))
a0d0e21e 130 TAINT_NOT;
e26df76a 131 if (PL_op->op_private & OPpASSIGN_CV_TO_GV) {
6136c704 132 SV * const cv = SvRV(left);
e26df76a
NC
133 const U32 cv_type = SvTYPE(cv);
134 const U32 gv_type = SvTYPE(right);
6136c704 135 const bool got_coderef = cv_type == SVt_PVCV || cv_type == SVt_PVFM;
e26df76a
NC
136
137 if (!got_coderef) {
138 assert(SvROK(cv));
139 }
140
ae6d515f 141 /* Can do the optimisation if right (LVALUE) is not a typeglob,
e26df76a
NC
142 left (RVALUE) is a reference to something, and we're in void
143 context. */
144 if (!got_coderef && gv_type != SVt_PVGV && GIMME_V == G_VOID) {
145 /* Is the target symbol table currently empty? */
6136c704 146 GV * const gv = gv_fetchsv(right, GV_NOINIT, SVt_PVGV);
bb112e5a 147 if (SvTYPE(gv) != SVt_PVGV && !SvOK(gv)) {
e26df76a
NC
148 /* Good. Create a new proxy constant subroutine in the target.
149 The gv becomes a(nother) reference to the constant. */
150 SV *const value = SvRV(cv);
151
152 SvUPGRADE((SV *)gv, SVt_RV);
1ccdb730 153 SvPCS_IMPORTED_on(gv);
e26df76a 154 SvRV_set(gv, value);
b37c2d43 155 SvREFCNT_inc_simple_void(value);
e26df76a
NC
156 SETs(right);
157 RETURN;
158 }
159 }
160
161 /* Need to fix things up. */
162 if (gv_type != SVt_PVGV) {
163 /* Need to fix GV. */
164 right = (SV*)gv_fetchsv(right, GV_ADD, SVt_PVGV);
165 }
166
167 if (!got_coderef) {
168 /* We've been returned a constant rather than a full subroutine,
169 but they expect a subroutine reference to apply. */
170 ENTER;
b37c2d43 171 SvREFCNT_inc_void(SvRV(cv));
e26df76a
NC
172 /* newCONSTSUB takes a reference count on the passed in SV
173 from us. We set the name to NULL, otherwise we get into
174 all sorts of fun as the reference to our new sub is
175 donated to the GV that we're about to assign to.
176 */
177 SvRV_set(left, (SV *)newCONSTSUB(GvSTASH(right), NULL,
178 SvRV(cv)));
179 SvREFCNT_dec(cv);
180 LEAVE;
e26df76a
NC
181 }
182
ae6d515f
RGS
183 if (strEQ(GvNAME(right),"isa")) {
184 GvCVGEN(right) = 0;
185 ++PL_sub_generation;
186 }
e26df76a 187 }
54310121 188 SvSetMagicSV(right, left);
a0d0e21e
LW
189 SETs(right);
190 RETURN;
191}
192
193PP(pp_cond_expr)
194{
97aff369 195 dVAR; dSP;
a0d0e21e 196 if (SvTRUEx(POPs))
1a67a97c 197 RETURNOP(cLOGOP->op_other);
a0d0e21e 198 else
1a67a97c 199 RETURNOP(cLOGOP->op_next);
a0d0e21e
LW
200}
201
202PP(pp_unstack)
203{
97aff369 204 dVAR;
a0d0e21e
LW
205 I32 oldsave;
206 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 207 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e 208 FREETMPS;
3280af22 209 oldsave = PL_scopestack[PL_scopestack_ix - 1];
a0d0e21e
LW
210 LEAVE_SCOPE(oldsave);
211 return NORMAL;
212}
213
a0d0e21e
LW
214PP(pp_concat)
215{
97aff369 216 dVAR; dSP; dATARGET; tryAMAGICbin(concat,opASSIGN);
748a9306
LW
217 {
218 dPOPTOPssrl;
8d6d96c1
HS
219 bool lbyte;
220 STRLEN rlen;
d4c19fe8 221 const char *rpv = NULL;
a6b599c7 222 bool rbyte = FALSE;
a9c4fd4e 223 bool rcopied = FALSE;
8d6d96c1
HS
224
225 if (TARG == right && right != left) {
c75ab21a
RH
226 /* mg_get(right) may happen here ... */
227 rpv = SvPV_const(right, rlen);
228 rbyte = !DO_UTF8(right);
8d6d96c1 229 right = sv_2mortal(newSVpvn(rpv, rlen));
349d4f2f 230 rpv = SvPV_const(right, rlen); /* no point setting UTF-8 here */
db79b45b 231 rcopied = TRUE;
8d6d96c1 232 }
7889fe52 233
8d6d96c1 234 if (TARG != left) {
a9c4fd4e 235 STRLEN llen;
5c144d81 236 const char* const lpv = SvPV_const(left, llen); /* mg_get(left) may happen here */
90f5826e 237 lbyte = !DO_UTF8(left);
8d6d96c1
HS
238 sv_setpvn(TARG, lpv, llen);
239 if (!lbyte)
240 SvUTF8_on(TARG);
241 else
242 SvUTF8_off(TARG);
243 }
244 else { /* TARG == left */
a9c4fd4e 245 STRLEN llen;
5b295bef 246 SvGETMAGIC(left); /* or mg_get(left) may happen here */
c75ab21a
RH
247 if (!SvOK(TARG)) {
248 if (left == right && ckWARN(WARN_UNINITIALIZED))
249 report_uninit(right);
c69006e4 250 sv_setpvn(left, "", 0);
c75ab21a 251 }
10516c54 252 (void)SvPV_nomg_const(left, llen); /* Needed to set UTF8 flag */
90f5826e
ST
253 lbyte = !DO_UTF8(left);
254 if (IN_BYTES)
255 SvUTF8_off(TARG);
8d6d96c1 256 }
a12c0f56 257
c75ab21a
RH
258 /* or mg_get(right) may happen here */
259 if (!rcopied) {
260 rpv = SvPV_const(right, rlen);
261 rbyte = !DO_UTF8(right);
262 }
8d6d96c1
HS
263 if (lbyte != rbyte) {
264 if (lbyte)
265 sv_utf8_upgrade_nomg(TARG);
266 else {
db79b45b
JH
267 if (!rcopied)
268 right = sv_2mortal(newSVpvn(rpv, rlen));
8d6d96c1 269 sv_utf8_upgrade_nomg(right);
349d4f2f 270 rpv = SvPV_const(right, rlen);
69b47968 271 }
a0d0e21e 272 }
8d6d96c1 273 sv_catpvn_nomg(TARG, rpv, rlen);
43ebc500 274
a0d0e21e
LW
275 SETTARG;
276 RETURN;
748a9306 277 }
a0d0e21e
LW
278}
279
280PP(pp_padsv)
281{
97aff369 282 dVAR; dSP; dTARGET;
a0d0e21e 283 XPUSHs(TARG);
533c011a
NIS
284 if (PL_op->op_flags & OPf_MOD) {
285 if (PL_op->op_private & OPpLVAL_INTRO)
952306ac
RGS
286 if (!(PL_op->op_private & OPpPAD_STATE))
287 SAVECLEARSV(PAD_SVl(PL_op->op_targ));
a62b51b8 288 if (PL_op->op_private & OPpDEREF) {
8ec5e241 289 PUTBACK;
dd2155a4 290 vivify_ref(PAD_SVl(PL_op->op_targ), PL_op->op_private & OPpDEREF);
8ec5e241
NIS
291 SPAGAIN;
292 }
4633a7c4 293 }
a0d0e21e
LW
294 RETURN;
295}
296
297PP(pp_readline)
298{
97aff369 299 dVAR;
f5284f61 300 tryAMAGICunTARGET(iter, 0);
3280af22 301 PL_last_in_gv = (GV*)(*PL_stack_sp--);
8efb3254 302 if (SvTYPE(PL_last_in_gv) != SVt_PVGV) {
1c846c1f 303 if (SvROK(PL_last_in_gv) && SvTYPE(SvRV(PL_last_in_gv)) == SVt_PVGV)
f5284f61 304 PL_last_in_gv = (GV*)SvRV(PL_last_in_gv);
8efb3254 305 else {
f5284f61
IZ
306 dSP;
307 XPUSHs((SV*)PL_last_in_gv);
308 PUTBACK;
cea2e8a9 309 pp_rv2gv();
f5284f61 310 PL_last_in_gv = (GV*)(*PL_stack_sp--);
f5284f61
IZ
311 }
312 }
a0d0e21e
LW
313 return do_readline();
314}
315
316PP(pp_eq)
317{
97aff369 318 dVAR; dSP; tryAMAGICbinSET(eq,0);
4c9fe80f 319#ifndef NV_PRESERVES_UV
0bdaccee 320 if (SvROK(TOPs) && !SvAMAGIC(TOPs) && SvROK(TOPm1s) && !SvAMAGIC(TOPm1s)) {
e61d22ef
NC
321 SP--;
322 SETs(boolSV(SvRV(TOPs) == SvRV(TOPp1s)));
4c9fe80f
AS
323 RETURN;
324 }
325#endif
28e5dec8
JH
326#ifdef PERL_PRESERVE_IVUV
327 SvIV_please(TOPs);
328 if (SvIOK(TOPs)) {
4c9fe80f
AS
329 /* Unless the left argument is integer in range we are going
330 to have to use NV maths. Hence only attempt to coerce the
331 right argument if we know the left is integer. */
28e5dec8
JH
332 SvIV_please(TOPm1s);
333 if (SvIOK(TOPm1s)) {
0bd48802
AL
334 const bool auvok = SvUOK(TOPm1s);
335 const bool buvok = SvUOK(TOPs);
a12c0f56 336
1605159e
NC
337 if (auvok == buvok) { /* ## IV == IV or UV == UV ## */
338 /* Casting IV to UV before comparison isn't going to matter
339 on 2s complement. On 1s complement or sign&magnitude
340 (if we have any of them) it could to make negative zero
341 differ from normal zero. As I understand it. (Need to
342 check - is negative zero implementation defined behaviour
343 anyway?). NWC */
0bd48802
AL
344 const UV buv = SvUVX(POPs);
345 const UV auv = SvUVX(TOPs);
28e5dec8 346
28e5dec8
JH
347 SETs(boolSV(auv == buv));
348 RETURN;
349 }
350 { /* ## Mixed IV,UV ## */
1605159e 351 SV *ivp, *uvp;
28e5dec8 352 IV iv;
28e5dec8 353
1605159e 354 /* == is commutative so doesn't matter which is left or right */
28e5dec8 355 if (auvok) {
1605159e
NC
356 /* top of stack (b) is the iv */
357 ivp = *SP;
358 uvp = *--SP;
359 } else {
360 uvp = *SP;
361 ivp = *--SP;
362 }
363 iv = SvIVX(ivp);
d4c19fe8 364 if (iv < 0)
1605159e
NC
365 /* As uv is a UV, it's >0, so it cannot be == */
366 SETs(&PL_sv_no);
d4c19fe8
AL
367 else
368 /* we know iv is >= 0 */
369 SETs(boolSV((UV)iv == SvUVX(uvp)));
28e5dec8
JH
370 RETURN;
371 }
372 }
373 }
374#endif
a0d0e21e 375 {
cab190d4
JD
376#if defined(NAN_COMPARE_BROKEN) && defined(Perl_isnan)
377 dPOPTOPnnrl;
378 if (Perl_isnan(left) || Perl_isnan(right))
379 RETSETNO;
380 SETs(boolSV(left == right));
381#else
a0d0e21e 382 dPOPnv;
54310121 383 SETs(boolSV(TOPn == value));
cab190d4 384#endif
a0d0e21e
LW
385 RETURN;
386 }
387}
388
389PP(pp_preinc)
390{
97aff369 391 dVAR; dSP;
f39684df 392 if (SvTYPE(TOPs) >= SVt_PVGV && SvTYPE(TOPs) != SVt_PVLV)
d470f89e 393 DIE(aTHX_ PL_no_modify);
3510b4a1
NC
394 if (!SvREADONLY(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
395 && SvIVX(TOPs) != IV_MAX)
55497cff 396 {
45977657 397 SvIV_set(TOPs, SvIVX(TOPs) + 1);
55497cff 398 SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
748a9306 399 }
28e5dec8 400 else /* Do all the PERL_PRESERVE_IVUV conditionals in sv_inc */
748a9306 401 sv_inc(TOPs);
a0d0e21e
LW
402 SvSETMAGIC(TOPs);
403 return NORMAL;
404}
405
406PP(pp_or)
407{
97aff369 408 dVAR; dSP;
a0d0e21e
LW
409 if (SvTRUE(TOPs))
410 RETURN;
411 else {
c960fc3b
SP
412 if (PL_op->op_type == OP_OR)
413 --SP;
a0d0e21e
LW
414 RETURNOP(cLOGOP->op_other);
415 }
416}
417
25a55bd7 418PP(pp_defined)
c963b151 419{
97aff369 420 dVAR; dSP;
6136c704
AL
421 register SV* sv;
422 bool defined;
25a55bd7 423 const int op_type = PL_op->op_type;
ea5195b7 424 const bool is_dor = (op_type == OP_DOR || op_type == OP_DORASSIGN);
c963b151 425
6136c704 426 if (is_dor) {
25a55bd7
SP
427 sv = TOPs;
428 if (!sv || !SvANY(sv)) {
2bd49cfc
NC
429 if (op_type == OP_DOR)
430 --SP;
25a55bd7
SP
431 RETURNOP(cLOGOP->op_other);
432 }
433 } else if (op_type == OP_DEFINED) {
434 sv = POPs;
435 if (!sv || !SvANY(sv))
436 RETPUSHNO;
d9aa96a4 437 } else
52a5c517 438 DIE(aTHX_ "panic: Invalid op (%s) in pp_defined()", OP_NAME(PL_op));
25a55bd7 439
6136c704 440 defined = FALSE;
c963b151
BD
441 switch (SvTYPE(sv)) {
442 case SVt_PVAV:
443 if (AvMAX(sv) >= 0 || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 444 defined = TRUE;
c963b151
BD
445 break;
446 case SVt_PVHV:
447 if (HvARRAY(sv) || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 448 defined = TRUE;
c963b151
BD
449 break;
450 case SVt_PVCV:
451 if (CvROOT(sv) || CvXSUB(sv))
25a55bd7 452 defined = TRUE;
c963b151
BD
453 break;
454 default:
5b295bef 455 SvGETMAGIC(sv);
c963b151 456 if (SvOK(sv))
25a55bd7 457 defined = TRUE;
6136c704 458 break;
c963b151 459 }
6136c704
AL
460
461 if (is_dor) {
c960fc3b
SP
462 if(defined)
463 RETURN;
464 if(op_type == OP_DOR)
465 --SP;
25a55bd7 466 RETURNOP(cLOGOP->op_other);
25a55bd7 467 }
d9aa96a4
SP
468 /* assuming OP_DEFINED */
469 if(defined)
470 RETPUSHYES;
471 RETPUSHNO;
c963b151
BD
472}
473
a0d0e21e
LW
474PP(pp_add)
475{
97aff369 476 dVAR; dSP; dATARGET; bool useleft; tryAMAGICbin(add,opASSIGN);
28e5dec8
JH
477 useleft = USE_LEFT(TOPm1s);
478#ifdef PERL_PRESERVE_IVUV
479 /* We must see if we can perform the addition with integers if possible,
480 as the integer code detects overflow while the NV code doesn't.
481 If either argument hasn't had a numeric conversion yet attempt to get
482 the IV. It's important to do this now, rather than just assuming that
483 it's not IOK as a PV of "9223372036854775806" may not take well to NV
484 addition, and an SV which is NOK, NV=6.0 ought to be coerced to
485 integer in case the second argument is IV=9223372036854775806
486 We can (now) rely on sv_2iv to do the right thing, only setting the
487 public IOK flag if the value in the NV (or PV) slot is truly integer.
488
489 A side effect is that this also aggressively prefers integer maths over
7dca457a
NC
490 fp maths for integer values.
491
a00b5bd3 492 How to detect overflow?
7dca457a
NC
493
494 C 99 section 6.2.6.1 says
495
496 The range of nonnegative values of a signed integer type is a subrange
497 of the corresponding unsigned integer type, and the representation of
498 the same value in each type is the same. A computation involving
499 unsigned operands can never overflow, because a result that cannot be
500 represented by the resulting unsigned integer type is reduced modulo
501 the number that is one greater than the largest value that can be
502 represented by the resulting type.
503
504 (the 9th paragraph)
505
506 which I read as "unsigned ints wrap."
507
508 signed integer overflow seems to be classed as "exception condition"
509
510 If an exceptional condition occurs during the evaluation of an
511 expression (that is, if the result is not mathematically defined or not
512 in the range of representable values for its type), the behavior is
513 undefined.
514
515 (6.5, the 5th paragraph)
516
517 I had assumed that on 2s complement machines signed arithmetic would
518 wrap, hence coded pp_add and pp_subtract on the assumption that
519 everything perl builds on would be happy. After much wailing and
520 gnashing of teeth it would seem that irix64 knows its ANSI spec well,
521 knows that it doesn't need to, and doesn't. Bah. Anyway, the all-
522 unsigned code below is actually shorter than the old code. :-)
523 */
524
28e5dec8
JH
525 SvIV_please(TOPs);
526 if (SvIOK(TOPs)) {
527 /* Unless the left argument is integer in range we are going to have to
528 use NV maths. Hence only attempt to coerce the right argument if
529 we know the left is integer. */
9c5ffd7c
JH
530 register UV auv = 0;
531 bool auvok = FALSE;
7dca457a
NC
532 bool a_valid = 0;
533
28e5dec8 534 if (!useleft) {
7dca457a
NC
535 auv = 0;
536 a_valid = auvok = 1;
537 /* left operand is undef, treat as zero. + 0 is identity,
538 Could SETi or SETu right now, but space optimise by not adding
539 lots of code to speed up what is probably a rarish case. */
540 } else {
541 /* Left operand is defined, so is it IV? */
542 SvIV_please(TOPm1s);
543 if (SvIOK(TOPm1s)) {
544 if ((auvok = SvUOK(TOPm1s)))
545 auv = SvUVX(TOPm1s);
546 else {
a3b680e6 547 register const IV aiv = SvIVX(TOPm1s);
7dca457a
NC
548 if (aiv >= 0) {
549 auv = aiv;
550 auvok = 1; /* Now acting as a sign flag. */
551 } else { /* 2s complement assumption for IV_MIN */
552 auv = (UV)-aiv;
553 }
554 }
555 a_valid = 1;
28e5dec8
JH
556 }
557 }
7dca457a
NC
558 if (a_valid) {
559 bool result_good = 0;
560 UV result;
561 register UV buv;
28e5dec8 562 bool buvok = SvUOK(TOPs);
a00b5bd3 563
7dca457a
NC
564 if (buvok)
565 buv = SvUVX(TOPs);
566 else {
a3b680e6 567 register const IV biv = SvIVX(TOPs);
7dca457a
NC
568 if (biv >= 0) {
569 buv = biv;
570 buvok = 1;
571 } else
572 buv = (UV)-biv;
573 }
574 /* ?uvok if value is >= 0. basically, flagged as UV if it's +ve,
602f51c4 575 else "IV" now, independent of how it came in.
7dca457a
NC
576 if a, b represents positive, A, B negative, a maps to -A etc
577 a + b => (a + b)
578 A + b => -(a - b)
579 a + B => (a - b)
580 A + B => -(a + b)
581 all UV maths. negate result if A negative.
582 add if signs same, subtract if signs differ. */
583
584 if (auvok ^ buvok) {
585 /* Signs differ. */
586 if (auv >= buv) {
587 result = auv - buv;
588 /* Must get smaller */
589 if (result <= auv)
590 result_good = 1;
591 } else {
592 result = buv - auv;
593 if (result <= buv) {
594 /* result really should be -(auv-buv). as its negation
595 of true value, need to swap our result flag */
596 auvok = !auvok;
597 result_good = 1;
28e5dec8
JH
598 }
599 }
7dca457a
NC
600 } else {
601 /* Signs same */
602 result = auv + buv;
603 if (result >= auv)
604 result_good = 1;
605 }
606 if (result_good) {
607 SP--;
608 if (auvok)
28e5dec8 609 SETu( result );
7dca457a
NC
610 else {
611 /* Negate result */
612 if (result <= (UV)IV_MIN)
613 SETi( -(IV)result );
614 else {
615 /* result valid, but out of range for IV. */
616 SETn( -(NV)result );
28e5dec8
JH
617 }
618 }
7dca457a
NC
619 RETURN;
620 } /* Overflow, drop through to NVs. */
28e5dec8
JH
621 }
622 }
623#endif
a0d0e21e 624 {
28e5dec8
JH
625 dPOPnv;
626 if (!useleft) {
627 /* left operand is undef, treat as zero. + 0.0 is identity. */
628 SETn(value);
629 RETURN;
630 }
631 SETn( value + TOPn );
632 RETURN;
a0d0e21e
LW
633 }
634}
635
636PP(pp_aelemfast)
637{
97aff369 638 dVAR; dSP;
c445ea15 639 AV * const av = PL_op->op_flags & OPf_SPECIAL ?
6a077020 640 (AV*)PAD_SV(PL_op->op_targ) : GvAV(cGVOP_gv);
a3b680e6 641 const U32 lval = PL_op->op_flags & OPf_MOD;
0bd48802 642 SV** const svp = av_fetch(av, PL_op->op_private, lval);
3280af22 643 SV *sv = (svp ? *svp : &PL_sv_undef);
6ff81951 644 EXTEND(SP, 1);
be6c24e0
GS
645 if (!lval && SvGMAGICAL(sv)) /* see note in pp_helem() */
646 sv = sv_mortalcopy(sv);
647 PUSHs(sv);
a0d0e21e
LW
648 RETURN;
649}
650
651PP(pp_join)
652{
97aff369 653 dVAR; dSP; dMARK; dTARGET;
a0d0e21e
LW
654 MARK++;
655 do_join(TARG, *MARK, MARK, SP);
656 SP = MARK;
657 SETs(TARG);
658 RETURN;
659}
660
661PP(pp_pushre)
662{
97aff369 663 dVAR; dSP;
44a8e56a
PP
664#ifdef DEBUGGING
665 /*
666 * We ass_u_me that LvTARGOFF() comes first, and that two STRLENs
667 * will be enough to hold an OP*.
668 */
c4420975 669 SV* const sv = sv_newmortal();
44a8e56a
PP
670 sv_upgrade(sv, SVt_PVLV);
671 LvTYPE(sv) = '/';
533c011a 672 Copy(&PL_op, &LvTARGOFF(sv), 1, OP*);
44a8e56a
PP
673 XPUSHs(sv);
674#else
6b88bc9c 675 XPUSHs((SV*)PL_op);
44a8e56a 676#endif
a0d0e21e
LW
677 RETURN;
678}
679
680/* Oversized hot code. */
681
682PP(pp_print)
683{
27da23d5 684 dVAR; dSP; dMARK; dORIGMARK;
a0d0e21e 685 IO *io;
760ac839 686 register PerlIO *fp;
236988e4 687 MAGIC *mg;
0bd48802 688 GV * const gv = (PL_op->op_flags & OPf_STACKED) ? (GV*)*++MARK : PL_defoutgv;
5b468f54
AMS
689
690 if (gv && (io = GvIO(gv))
691 && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar)))
692 {
01bb7c6d 693 had_magic:
68dc0745 694 if (MARK == ORIGMARK) {
1c846c1f 695 /* If using default handle then we need to make space to
a60c0954
NIS
696 * pass object as 1st arg, so move other args up ...
697 */
4352c267 698 MEXTEND(SP, 1);
68dc0745
PP
699 ++MARK;
700 Move(MARK, MARK + 1, (SP - MARK) + 1, SV*);
701 ++SP;
702 }
703 PUSHMARK(MARK - 1);
5b468f54 704 *MARK = SvTIED_obj((SV*)io, mg);
68dc0745 705 PUTBACK;
236988e4 706 ENTER;
864dbfa3 707 call_method("PRINT", G_SCALAR);
236988e4
PP
708 LEAVE;
709 SPAGAIN;
68dc0745
PP
710 MARK = ORIGMARK + 1;
711 *MARK = *SP;
712 SP = MARK;
236988e4
PP
713 RETURN;
714 }
a0d0e21e 715 if (!(io = GvIO(gv))) {
5b468f54
AMS
716 if ((GvEGV(gv)) && (io = GvIO(GvEGV(gv)))
717 && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar)))
01bb7c6d 718 goto had_magic;
2dd78f96
JH
719 if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
720 report_evil_fh(gv, io, PL_op->op_type);
93189314 721 SETERRNO(EBADF,RMS_IFI);
a0d0e21e
LW
722 goto just_say_no;
723 }
724 else if (!(fp = IoOFP(io))) {
599cee73 725 if (ckWARN2(WARN_CLOSED, WARN_IO)) {
4c80c0b2
NC
726 if (IoIFP(io))
727 report_evil_fh(gv, io, OP_phoney_INPUT_ONLY);
2dd78f96 728 else if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
bc37a18f 729 report_evil_fh(gv, io, PL_op->op_type);
a0d0e21e 730 }
93189314 731 SETERRNO(EBADF,IoIFP(io)?RMS_FAC:RMS_IFI);
a0d0e21e
LW
732 goto just_say_no;
733 }
734 else {
735 MARK++;
7889fe52 736 if (PL_ofs_sv && SvOK(PL_ofs_sv)) {
a0d0e21e
LW
737 while (MARK <= SP) {
738 if (!do_print(*MARK, fp))
739 break;
740 MARK++;
741 if (MARK <= SP) {
7889fe52 742 if (!do_print(PL_ofs_sv, fp)) { /* $, */
a0d0e21e
LW
743 MARK--;
744 break;
745 }
746 }
747 }
748 }
749 else {
750 while (MARK <= SP) {
751 if (!do_print(*MARK, fp))
752 break;
753 MARK++;
754 }
755 }
756 if (MARK <= SP)
757 goto just_say_no;
758 else {
cfc4a7da
GA
759 if (PL_op->op_type == OP_SAY) {
760 if (PerlIO_write(fp, "\n", 1) == 0 || PerlIO_error(fp))
761 goto just_say_no;
762 }
763 else if (PL_ors_sv && SvOK(PL_ors_sv))
7889fe52 764 if (!do_print(PL_ors_sv, fp)) /* $\ */
a0d0e21e
LW
765 goto just_say_no;
766
767 if (IoFLAGS(io) & IOf_FLUSH)
760ac839 768 if (PerlIO_flush(fp) == EOF)
a0d0e21e
LW
769 goto just_say_no;
770 }
771 }
772 SP = ORIGMARK;
e52fd6f4 773 XPUSHs(&PL_sv_yes);
a0d0e21e
LW
774 RETURN;
775
776 just_say_no:
777 SP = ORIGMARK;
e52fd6f4 778 XPUSHs(&PL_sv_undef);
a0d0e21e
LW
779 RETURN;
780}
781
782PP(pp_rv2av)
783{
97aff369 784 dVAR; dSP; dTOPss;
a0d0e21e
LW
785 AV *av;
786
787 if (SvROK(sv)) {
788 wasref:
f5284f61
IZ
789 tryAMAGICunDEREF(to_av);
790
a0d0e21e
LW
791 av = (AV*)SvRV(sv);
792 if (SvTYPE(av) != SVt_PVAV)
cea2e8a9 793 DIE(aTHX_ "Not an ARRAY reference");
533c011a 794 if (PL_op->op_flags & OPf_REF) {
f5284f61 795 SETs((SV*)av);
a0d0e21e
LW
796 RETURN;
797 }
78f9721b
SM
798 else if (LVRET) {
799 if (GIMME == G_SCALAR)
800 Perl_croak(aTHX_ "Can't return array to lvalue scalar context");
801 SETs((SV*)av);
802 RETURN;
803 }
82d03984
RGS
804 else if (PL_op->op_flags & OPf_MOD
805 && PL_op->op_private & OPpLVAL_INTRO)
806 Perl_croak(aTHX_ PL_no_localize_ref);
a0d0e21e
LW
807 }
808 else {
809 if (SvTYPE(sv) == SVt_PVAV) {
810 av = (AV*)sv;
533c011a 811 if (PL_op->op_flags & OPf_REF) {
f5284f61 812 SETs((SV*)av);
a0d0e21e
LW
813 RETURN;
814 }
78f9721b
SM
815 else if (LVRET) {
816 if (GIMME == G_SCALAR)
817 Perl_croak(aTHX_ "Can't return array to lvalue"
818 " scalar context");
819 SETs((SV*)av);
820 RETURN;
821 }
a0d0e21e
LW
822 }
823 else {
67955e0c 824 GV *gv;
1c846c1f 825
a0d0e21e
LW
826 if (SvTYPE(sv) != SVt_PVGV) {
827 if (SvGMAGICAL(sv)) {
828 mg_get(sv);
829 if (SvROK(sv))
830 goto wasref;
831 }
832 if (!SvOK(sv)) {
533c011a
NIS
833 if (PL_op->op_flags & OPf_REF ||
834 PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 835 DIE(aTHX_ PL_no_usym, "an ARRAY");
599cee73 836 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 837 report_uninit(sv);
f5284f61 838 if (GIMME == G_ARRAY) {
c2444246 839 (void)POPs;
4633a7c4 840 RETURN;
f5284f61
IZ
841 }
842 RETSETUNDEF;
a0d0e21e 843 }
35cd451c
GS
844 if ((PL_op->op_flags & OPf_SPECIAL) &&
845 !(PL_op->op_flags & OPf_MOD))
846 {
f776e3cd 847 gv = (GV*)gv_fetchsv(sv, 0, SVt_PVAV);
c9d5ac95 848 if (!gv
7a5fd60d 849 && (!is_gv_magical_sv(sv,0)
f776e3cd 850 || !(gv = (GV*)gv_fetchsv(sv, GV_ADD, SVt_PVAV))))
c9d5ac95 851 {
35cd451c 852 RETSETUNDEF;
c9d5ac95 853 }
35cd451c
GS
854 }
855 else {
856 if (PL_op->op_private & HINT_STRICT_REFS)
7a5fd60d 857 DIE(aTHX_ PL_no_symref_sv, sv, "an ARRAY");
f776e3cd 858 gv = (GV*)gv_fetchsv(sv, GV_ADD, SVt_PVAV);
35cd451c
GS
859 }
860 }
861 else {
67955e0c 862 gv = (GV*)sv;
a0d0e21e 863 }
67955e0c 864 av = GvAVn(gv);
533c011a 865 if (PL_op->op_private & OPpLVAL_INTRO)
67955e0c 866 av = save_ary(gv);
533c011a 867 if (PL_op->op_flags & OPf_REF) {
f5284f61 868 SETs((SV*)av);
a0d0e21e
LW
869 RETURN;
870 }
78f9721b
SM
871 else if (LVRET) {
872 if (GIMME == G_SCALAR)
873 Perl_croak(aTHX_ "Can't return array to lvalue"
874 " scalar context");
875 SETs((SV*)av);
876 RETURN;
877 }
a0d0e21e
LW
878 }
879 }
880
881 if (GIMME == G_ARRAY) {
a3b680e6 882 const I32 maxarg = AvFILL(av) + 1;
c2444246 883 (void)POPs; /* XXXX May be optimized away? */
1c846c1f 884 EXTEND(SP, maxarg);
93965878 885 if (SvRMAGICAL(av)) {
1c846c1f 886 U32 i;
eb160463 887 for (i=0; i < (U32)maxarg; i++) {
0bcc34c2 888 SV ** const svp = av_fetch(av, i, FALSE);
547d1dd8
HS
889 /* See note in pp_helem, and bug id #27839 */
890 SP[i+1] = svp
891 ? SvGMAGICAL(*svp) ? sv_mortalcopy(*svp) : *svp
892 : &PL_sv_undef;
93965878 893 }
1c846c1f 894 }
93965878
NIS
895 else {
896 Copy(AvARRAY(av), SP+1, maxarg, SV*);
897 }
a0d0e21e
LW
898 SP += maxarg;
899 }
c754c3d7 900 else if (GIMME_V == G_SCALAR) {
a0d0e21e 901 dTARGET;
a3b680e6 902 const I32 maxarg = AvFILL(av) + 1;
f5284f61 903 SETi(maxarg);
a0d0e21e
LW
904 }
905 RETURN;
906}
907
908PP(pp_rv2hv)
909{
97aff369 910 dVAR; dSP; dTOPss;
a0d0e21e 911 HV *hv;
a3b680e6
AL
912 const I32 gimme = GIMME_V;
913 static const char return_hash_to_lvalue_scalar[] = "Can't return hash to lvalue scalar context";
a0d0e21e
LW
914
915 if (SvROK(sv)) {
916 wasref:
f5284f61
IZ
917 tryAMAGICunDEREF(to_hv);
918
a0d0e21e 919 hv = (HV*)SvRV(sv);
6d822dc4 920 if (SvTYPE(hv) != SVt_PVHV)
cea2e8a9 921 DIE(aTHX_ "Not a HASH reference");
533c011a 922 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
923 SETs((SV*)hv);
924 RETURN;
925 }
78f9721b 926 else if (LVRET) {
be85d344 927 if (gimme != G_ARRAY)
a3b680e6 928 Perl_croak(aTHX_ return_hash_to_lvalue_scalar );
78f9721b
SM
929 SETs((SV*)hv);
930 RETURN;
931 }
82d03984
RGS
932 else if (PL_op->op_flags & OPf_MOD
933 && PL_op->op_private & OPpLVAL_INTRO)
934 Perl_croak(aTHX_ PL_no_localize_ref);
a0d0e21e
LW
935 }
936 else {
6d822dc4 937 if (SvTYPE(sv) == SVt_PVHV) {
a0d0e21e 938 hv = (HV*)sv;
533c011a 939 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
940 SETs((SV*)hv);
941 RETURN;
942 }
78f9721b 943 else if (LVRET) {
be85d344 944 if (gimme != G_ARRAY)
a3b680e6 945 Perl_croak(aTHX_ return_hash_to_lvalue_scalar );
78f9721b
SM
946 SETs((SV*)hv);
947 RETURN;
948 }
a0d0e21e
LW
949 }
950 else {
67955e0c 951 GV *gv;
1c846c1f 952
a0d0e21e
LW
953 if (SvTYPE(sv) != SVt_PVGV) {
954 if (SvGMAGICAL(sv)) {
955 mg_get(sv);
956 if (SvROK(sv))
957 goto wasref;
958 }
959 if (!SvOK(sv)) {
533c011a
NIS
960 if (PL_op->op_flags & OPf_REF ||
961 PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 962 DIE(aTHX_ PL_no_usym, "a HASH");
599cee73 963 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 964 report_uninit(sv);
be85d344 965 if (gimme == G_ARRAY) {
4633a7c4
LW
966 SP--;
967 RETURN;
968 }
a0d0e21e
LW
969 RETSETUNDEF;
970 }
35cd451c
GS
971 if ((PL_op->op_flags & OPf_SPECIAL) &&
972 !(PL_op->op_flags & OPf_MOD))
973 {
f776e3cd 974 gv = (GV*)gv_fetchsv(sv, 0, SVt_PVHV);
c9d5ac95 975 if (!gv
7a5fd60d 976 && (!is_gv_magical_sv(sv,0)
f776e3cd 977 || !(gv = (GV*)gv_fetchsv(sv, GV_ADD, SVt_PVHV))))
c9d5ac95 978 {
35cd451c 979 RETSETUNDEF;
c9d5ac95 980 }
35cd451c
GS
981 }
982 else {
983 if (PL_op->op_private & HINT_STRICT_REFS)
7a5fd60d 984 DIE(aTHX_ PL_no_symref_sv, sv, "a HASH");
f776e3cd 985 gv = (GV*)gv_fetchsv(sv, GV_ADD, SVt_PVHV);
35cd451c
GS
986 }
987 }
988 else {
67955e0c 989 gv = (GV*)sv;
a0d0e21e 990 }
67955e0c 991 hv = GvHVn(gv);
533c011a 992 if (PL_op->op_private & OPpLVAL_INTRO)
67955e0c 993 hv = save_hash(gv);
533c011a 994 if (PL_op->op_flags & OPf_REF) {
a0d0e21e
LW
995 SETs((SV*)hv);
996 RETURN;
997 }
78f9721b 998 else if (LVRET) {
be85d344 999 if (gimme != G_ARRAY)
a3b680e6 1000 Perl_croak(aTHX_ return_hash_to_lvalue_scalar );
78f9721b
SM
1001 SETs((SV*)hv);
1002 RETURN;
1003 }
a0d0e21e
LW
1004 }
1005 }
1006
be85d344 1007 if (gimme == G_ARRAY) { /* array wanted */
3280af22 1008 *PL_stack_sp = (SV*)hv;
cea2e8a9 1009 return do_kv();
a0d0e21e 1010 }
be85d344 1011 else if (gimme == G_SCALAR) {
a0d0e21e 1012 dTARGET;
243d6ab3 1013 TARG = Perl_hv_scalar(aTHX_ hv);
a0d0e21e 1014 SETTARG;
a0d0e21e 1015 }
be85d344 1016 RETURN;
a0d0e21e
LW
1017}
1018
10c8fecd
GS
1019STATIC void
1020S_do_oddball(pTHX_ HV *hash, SV **relem, SV **firstrelem)
1021{
97aff369 1022 dVAR;
10c8fecd
GS
1023 if (*relem) {
1024 SV *tmpstr;
b464bac0 1025 const HE *didstore;
6d822dc4
MS
1026
1027 if (ckWARN(WARN_MISC)) {
a3b680e6 1028 const char *err;
10c8fecd
GS
1029 if (relem == firstrelem &&
1030 SvROK(*relem) &&
1031 (SvTYPE(SvRV(*relem)) == SVt_PVAV ||
1032 SvTYPE(SvRV(*relem)) == SVt_PVHV))
1033 {
a3b680e6 1034 err = "Reference found where even-sized list expected";
10c8fecd
GS
1035 }
1036 else
a3b680e6
AL
1037 err = "Odd number of elements in hash assignment";
1038 Perl_warner(aTHX_ packWARN(WARN_MISC), err);
10c8fecd 1039 }
6d822dc4 1040
561b68a9 1041 tmpstr = newSV(0);
6d822dc4
MS
1042 didstore = hv_store_ent(hash,*relem,tmpstr,0);
1043 if (SvMAGICAL(hash)) {
1044 if (SvSMAGICAL(tmpstr))
1045 mg_set(tmpstr);
1046 if (!didstore)
1047 sv_2mortal(tmpstr);
1048 }
1049 TAINT_NOT;
10c8fecd
GS
1050 }
1051}
1052
a0d0e21e
LW
1053PP(pp_aassign)
1054{
27da23d5 1055 dVAR; dSP;
3280af22
NIS
1056 SV **lastlelem = PL_stack_sp;
1057 SV **lastrelem = PL_stack_base + POPMARK;
1058 SV **firstrelem = PL_stack_base + POPMARK + 1;
a0d0e21e
LW
1059 SV **firstlelem = lastrelem + 1;
1060
1061 register SV **relem;
1062 register SV **lelem;
1063
1064 register SV *sv;
1065 register AV *ary;
1066
54310121 1067 I32 gimme;
a0d0e21e
LW
1068 HV *hash;
1069 I32 i;
1070 int magic;
ca65944e 1071 int duplicates = 0;
cbbf8932 1072 SV **firsthashrelem = NULL; /* "= 0" keeps gcc 2.95 quiet */
5637b936 1073
a0d0e21e 1074
3280af22 1075 PL_delaymagic = DM_DELAY; /* catch simultaneous items */
ca65944e 1076 gimme = GIMME_V;
a0d0e21e
LW
1077
1078 /* If there's a common identifier on both sides we have to take
1079 * special care that assigning the identifier on the left doesn't
1080 * clobber a value on the right that's used later in the list.
1081 */
10c8fecd 1082 if (PL_op->op_private & (OPpASSIGN_COMMON)) {
cc5e57d2 1083 EXTEND_MORTAL(lastrelem - firstrelem + 1);
10c8fecd 1084 for (relem = firstrelem; relem <= lastrelem; relem++) {
155aba94 1085 if ((sv = *relem)) {
a1f49e72 1086 TAINT_NOT; /* Each item is independent */
10c8fecd 1087 *relem = sv_mortalcopy(sv);
a1f49e72 1088 }
10c8fecd 1089 }
a0d0e21e 1090 }
461824dc
RGS
1091 if (PL_op->op_private & OPpASSIGN_STATE) {
1092 if (SvPADSTALE(*firstlelem))
1093 SvPADSTALE_off(*firstlelem);
1094 else
1095 RETURN; /* ignore assignment */
1096 }
a0d0e21e
LW
1097
1098 relem = firstrelem;
1099 lelem = firstlelem;
4608196e
RGS
1100 ary = NULL;
1101 hash = NULL;
10c8fecd 1102
a0d0e21e 1103 while (lelem <= lastlelem) {
bbce6d69 1104 TAINT_NOT; /* Each item stands on its own, taintwise. */
a0d0e21e
LW
1105 sv = *lelem++;
1106 switch (SvTYPE(sv)) {
1107 case SVt_PVAV:
1108 ary = (AV*)sv;
748a9306 1109 magic = SvMAGICAL(ary) != 0;
a0d0e21e 1110 av_clear(ary);
7e42bd57 1111 av_extend(ary, lastrelem - relem);
a0d0e21e
LW
1112 i = 0;
1113 while (relem <= lastrelem) { /* gobble up all the rest */
5117ca91 1114 SV **didstore;
a0d0e21e 1115 assert(*relem);
f2b990bf 1116 sv = newSVsv(*relem);
a0d0e21e 1117 *(relem++) = sv;
5117ca91
GS
1118 didstore = av_store(ary,i++,sv);
1119 if (magic) {
fb73857a
PP
1120 if (SvSMAGICAL(sv))
1121 mg_set(sv);
5117ca91 1122 if (!didstore)
8127e0e3 1123 sv_2mortal(sv);
5117ca91 1124 }
bbce6d69 1125 TAINT_NOT;
a0d0e21e
LW
1126 }
1127 break;
10c8fecd 1128 case SVt_PVHV: { /* normal hash */
a0d0e21e
LW
1129 SV *tmpstr;
1130
1131 hash = (HV*)sv;
748a9306 1132 magic = SvMAGICAL(hash) != 0;
a0d0e21e 1133 hv_clear(hash);
ca65944e 1134 firsthashrelem = relem;
a0d0e21e
LW
1135
1136 while (relem < lastrelem) { /* gobble up all the rest */
5117ca91 1137 HE *didstore;
6136c704
AL
1138 sv = *relem ? *relem : &PL_sv_no;
1139 relem++;
561b68a9 1140 tmpstr = newSV(0);
a0d0e21e
LW
1141 if (*relem)
1142 sv_setsv(tmpstr,*relem); /* value */
1143 *(relem++) = tmpstr;
ca65944e
RGS
1144 if (gimme != G_VOID && hv_exists_ent(hash, sv, 0))
1145 /* key overwrites an existing entry */
1146 duplicates += 2;
5117ca91
GS
1147 didstore = hv_store_ent(hash,sv,tmpstr,0);
1148 if (magic) {
fb73857a
PP
1149 if (SvSMAGICAL(tmpstr))
1150 mg_set(tmpstr);
5117ca91 1151 if (!didstore)
8127e0e3 1152 sv_2mortal(tmpstr);
5117ca91 1153 }
bbce6d69 1154 TAINT_NOT;
8e07c86e 1155 }
6a0deba8 1156 if (relem == lastrelem) {
10c8fecd 1157 do_oddball(hash, relem, firstrelem);
6a0deba8 1158 relem++;
1930e939 1159 }
a0d0e21e
LW
1160 }
1161 break;
1162 default:
6fc92669
GS
1163 if (SvIMMORTAL(sv)) {
1164 if (relem <= lastrelem)
1165 relem++;
1166 break;
a0d0e21e
LW
1167 }
1168 if (relem <= lastrelem) {
1169 sv_setsv(sv, *relem);
1170 *(relem++) = sv;
1171 }
1172 else
3280af22 1173 sv_setsv(sv, &PL_sv_undef);
a0d0e21e
LW
1174 SvSETMAGIC(sv);
1175 break;
1176 }
1177 }
3280af22
NIS
1178 if (PL_delaymagic & ~DM_DELAY) {
1179 if (PL_delaymagic & DM_UID) {
a0d0e21e 1180#ifdef HAS_SETRESUID
fb934a90
RD
1181 (void)setresuid((PL_delaymagic & DM_RUID) ? PL_uid : (Uid_t)-1,
1182 (PL_delaymagic & DM_EUID) ? PL_euid : (Uid_t)-1,
1183 (Uid_t)-1);
56febc5e
AD
1184#else
1185# ifdef HAS_SETREUID
fb934a90
RD
1186 (void)setreuid((PL_delaymagic & DM_RUID) ? PL_uid : (Uid_t)-1,
1187 (PL_delaymagic & DM_EUID) ? PL_euid : (Uid_t)-1);
56febc5e
AD
1188# else
1189# ifdef HAS_SETRUID
b28d0864
NIS
1190 if ((PL_delaymagic & DM_UID) == DM_RUID) {
1191 (void)setruid(PL_uid);
1192 PL_delaymagic &= ~DM_RUID;
a0d0e21e 1193 }
56febc5e
AD
1194# endif /* HAS_SETRUID */
1195# ifdef HAS_SETEUID
b28d0864 1196 if ((PL_delaymagic & DM_UID) == DM_EUID) {
fb934a90 1197 (void)seteuid(PL_euid);
b28d0864 1198 PL_delaymagic &= ~DM_EUID;
a0d0e21e 1199 }
56febc5e 1200# endif /* HAS_SETEUID */
b28d0864
NIS
1201 if (PL_delaymagic & DM_UID) {
1202 if (PL_uid != PL_euid)
cea2e8a9 1203 DIE(aTHX_ "No setreuid available");
b28d0864 1204 (void)PerlProc_setuid(PL_uid);
a0d0e21e 1205 }
56febc5e
AD
1206# endif /* HAS_SETREUID */
1207#endif /* HAS_SETRESUID */
d8eceb89
JH
1208 PL_uid = PerlProc_getuid();
1209 PL_euid = PerlProc_geteuid();
a0d0e21e 1210 }
3280af22 1211 if (PL_delaymagic & DM_GID) {
a0d0e21e 1212#ifdef HAS_SETRESGID
fb934a90
RD
1213 (void)setresgid((PL_delaymagic & DM_RGID) ? PL_gid : (Gid_t)-1,
1214 (PL_delaymagic & DM_EGID) ? PL_egid : (Gid_t)-1,
1215 (Gid_t)-1);
56febc5e
AD
1216#else
1217# ifdef HAS_SETREGID
fb934a90
RD
1218 (void)setregid((PL_delaymagic & DM_RGID) ? PL_gid : (Gid_t)-1,
1219 (PL_delaymagic & DM_EGID) ? PL_egid : (Gid_t)-1);
56febc5e
AD
1220# else
1221# ifdef HAS_SETRGID
b28d0864
NIS
1222 if ((PL_delaymagic & DM_GID) == DM_RGID) {
1223 (void)setrgid(PL_gid);
1224 PL_delaymagic &= ~DM_RGID;
a0d0e21e 1225 }
56febc5e
AD
1226# endif /* HAS_SETRGID */
1227# ifdef HAS_SETEGID
b28d0864 1228 if ((PL_delaymagic & DM_GID) == DM_EGID) {
fb934a90 1229 (void)setegid(PL_egid);
b28d0864 1230 PL_delaymagic &= ~DM_EGID;
a0d0e21e 1231 }
56febc5e 1232# endif /* HAS_SETEGID */
b28d0864
NIS
1233 if (PL_delaymagic & DM_GID) {
1234 if (PL_gid != PL_egid)
cea2e8a9 1235 DIE(aTHX_ "No setregid available");
b28d0864 1236 (void)PerlProc_setgid(PL_gid);
a0d0e21e 1237 }
56febc5e
AD
1238# endif /* HAS_SETREGID */
1239#endif /* HAS_SETRESGID */
d8eceb89
JH
1240 PL_gid = PerlProc_getgid();
1241 PL_egid = PerlProc_getegid();
a0d0e21e 1242 }
3280af22 1243 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
a0d0e21e 1244 }
3280af22 1245 PL_delaymagic = 0;
54310121 1246
54310121
PP
1247 if (gimme == G_VOID)
1248 SP = firstrelem - 1;
1249 else if (gimme == G_SCALAR) {
1250 dTARGET;
1251 SP = firstrelem;
ca65944e 1252 SETi(lastrelem - firstrelem + 1 - duplicates);
54310121
PP
1253 }
1254 else {
ca65944e 1255 if (ary)
a0d0e21e 1256 SP = lastrelem;
ca65944e
RGS
1257 else if (hash) {
1258 if (duplicates) {
1259 /* Removes from the stack the entries which ended up as
1260 * duplicated keys in the hash (fix for [perl #24380]) */
1261 Move(firsthashrelem + duplicates,
1262 firsthashrelem, duplicates, SV**);
1263 lastrelem -= duplicates;
1264 }
1265 SP = lastrelem;
1266 }
a0d0e21e
LW
1267 else
1268 SP = firstrelem + (lastlelem - firstlelem);
0c8c7a05 1269 lelem = firstlelem + (relem - firstrelem);
5f05dabc 1270 while (relem <= SP)
3280af22 1271 *relem++ = (lelem <= lastlelem) ? *lelem++ : &PL_sv_undef;
a0d0e21e 1272 }
54310121 1273 RETURN;
a0d0e21e
LW
1274}
1275
8782bef2
GB
1276PP(pp_qr)
1277{
97aff369 1278 dVAR; dSP;
c4420975
AL
1279 register PMOP * const pm = cPMOP;
1280 SV * const rv = sv_newmortal();
1281 SV * const sv = newSVrv(rv, "Regexp");
e08e52cf
AMS
1282 if (pm->op_pmdynflags & PMdf_TAINTED)
1283 SvTAINTED_on(rv);
aaa362c4 1284 sv_magic(sv,(SV*)ReREFCNT_inc(PM_GETRE(pm)), PERL_MAGIC_qr,0,0);
8782bef2
GB
1285 RETURNX(PUSHs(rv));
1286}
1287
a0d0e21e
LW
1288PP(pp_match)
1289{
97aff369 1290 dVAR; dSP; dTARG;
a0d0e21e 1291 register PMOP *pm = cPMOP;
d65afb4b 1292 PMOP *dynpm = pm;
0d46e09a
SP
1293 register const char *t;
1294 register const char *s;
5c144d81 1295 const char *strend;
a0d0e21e 1296 I32 global;
f722798b 1297 I32 r_flags = REXEC_CHECKED;
5c144d81 1298 const char *truebase; /* Start of string */
aaa362c4 1299 register REGEXP *rx = PM_GETRE(pm);
b3eb6a9b 1300 bool rxtainted;
a3b680e6 1301 const I32 gimme = GIMME;
a0d0e21e 1302 STRLEN len;
748a9306 1303 I32 minmatch = 0;
a3b680e6 1304 const I32 oldsave = PL_savestack_ix;
f86702cc 1305 I32 update_minmatch = 1;
e60df1fa 1306 I32 had_zerolen = 0;
58e23c8d 1307 U32 gpos = 0;
a0d0e21e 1308
533c011a 1309 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 1310 TARG = POPs;
59f00321
RGS
1311 else if (PL_op->op_private & OPpTARGET_MY)
1312 GETTARGET;
a0d0e21e 1313 else {
54b9620d 1314 TARG = DEFSV;
a0d0e21e
LW
1315 EXTEND(SP,1);
1316 }
d9f424b2 1317
c277df42 1318 PUTBACK; /* EVAL blocks need stack_sp. */
5c144d81 1319 s = SvPV_const(TARG, len);
a0d0e21e 1320 if (!s)
2269b42e 1321 DIE(aTHX_ "panic: pp_match");
890ce7af 1322 strend = s + len;
b3eb6a9b 1323 rxtainted = ((pm->op_pmdynflags & PMdf_TAINTED) ||
3280af22 1324 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
9212bbba 1325 TAINT_NOT;
a0d0e21e 1326
a30b2f1f 1327 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 1328
d65afb4b 1329 /* PMdf_USED is set after a ?? matches once */
48c036b1 1330 if (pm->op_pmdynflags & PMdf_USED) {
c277df42 1331 failure:
a0d0e21e
LW
1332 if (gimme == G_ARRAY)
1333 RETURN;
1334 RETPUSHNO;
1335 }
1336
d65afb4b 1337 /* empty pattern special-cased to use last successful pattern if possible */
3280af22
NIS
1338 if (!rx->prelen && PL_curpm) {
1339 pm = PL_curpm;
aaa362c4 1340 rx = PM_GETRE(pm);
a0d0e21e 1341 }
d65afb4b 1342
eb160463 1343 if (rx->minlen > (I32)len)
d65afb4b 1344 goto failure;
c277df42 1345
a0d0e21e 1346 truebase = t = s;
ad94a511
IZ
1347
1348 /* XXXX What part of this is needed with true \G-support? */
d65afb4b 1349 if ((global = dynpm->op_pmflags & PMf_GLOBAL)) {
cf93c79d 1350 rx->startp[0] = -1;
a0d0e21e 1351 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
c445ea15 1352 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
565764a8 1353 if (mg && mg->mg_len >= 0) {
bbe252da 1354 if (!(rx->extflags & RXf_GPOS_SEEN))
1c846c1f 1355 rx->endp[0] = rx->startp[0] = mg->mg_len;
bbe252da 1356 else if (rx->extflags & RXf_ANCH_GPOS) {
0ef3e39e 1357 r_flags |= REXEC_IGNOREPOS;
1c846c1f 1358 rx->endp[0] = rx->startp[0] = mg->mg_len;
bbe252da 1359 } else if (rx->extflags & RXf_GPOS_FLOAT)
58e23c8d
YO
1360 gpos = mg->mg_len;
1361 else
1362 rx->endp[0] = rx->startp[0] = mg->mg_len;
1363 minmatch = (mg->mg_flags & MGf_MINMATCH) ? rx->gofs + 1 : 0;
f86702cc 1364 update_minmatch = 0;
748a9306 1365 }
a0d0e21e
LW
1366 }
1367 }
58e23c8d
YO
1368 /* remove comment to get faster /g but possibly unsafe $1 vars after a
1369 match. Test for the unsafe vars will fail as well*/
1370 if (( /* !global && */ rx->nparens)
cde0cee5
YO
1371 || SvTEMP(TARG) || PL_sawampersand ||
1372 (pm->op_pmflags & (PMf_EVAL|PMf_KEEPCOPY)))
14977893 1373 r_flags |= REXEC_COPY_STR;
1c846c1f 1374 if (SvSCREAM(TARG))
22e551b9
IZ
1375 r_flags |= REXEC_SCREAM;
1376
a0d0e21e 1377play_it_again:
cf93c79d 1378 if (global && rx->startp[0] != -1) {
58e23c8d
YO
1379 t = s = rx->endp[0] + truebase - rx->gofs;
1380 if ((s + rx->minlen) > strend || s < truebase)
a0d0e21e 1381 goto nope;
f86702cc 1382 if (update_minmatch++)
e60df1fa 1383 minmatch = had_zerolen;
a0d0e21e 1384 }
bbe252da
YO
1385 if (rx->extflags & RXf_USE_INTUIT &&
1386 DO_UTF8(TARG) == ((rx->extflags & RXf_UTF8) != 0)) {
5c144d81
NC
1387 /* FIXME - can PL_bostr be made const char *? */
1388 PL_bostr = (char *)truebase;
f9f4320a 1389 s = CALLREG_INTUIT_START(rx, TARG, (char *)s, (char *)strend, r_flags, NULL);
f722798b
IZ
1390
1391 if (!s)
1392 goto nope;
bbe252da 1393 if ( (rx->extflags & RXf_CHECK_ALL)
14977893 1394 && !PL_sawampersand
cde0cee5 1395 && !(pm->op_pmflags & PMf_KEEPCOPY)
bbe252da
YO
1396 && ((rx->extflags & RXf_NOSCAN)
1397 || !((rx->extflags & RXf_INTUIT_TAIL)
05b4157f
GS
1398 && (r_flags & REXEC_SCREAM)))
1399 && !SvROK(TARG)) /* Cannot trust since INTUIT cannot guess ^ */
f722798b 1400 goto yup;
a0d0e21e 1401 }
70685ca0 1402 if (CALLREGEXEC(rx, (char*)s, (char *)strend, (char*)truebase, minmatch, TARG, INT2PTR(void*, gpos), r_flags))
bbce6d69 1403 {
3280af22 1404 PL_curpm = pm;
d65afb4b
HS
1405 if (dynpm->op_pmflags & PMf_ONCE)
1406 dynpm->op_pmdynflags |= PMdf_USED;
a0d0e21e
LW
1407 goto gotcha;
1408 }
1409 else
1410 goto ret_no;
1411 /*NOTREACHED*/
1412
1413 gotcha:
72311751
GS
1414 if (rxtainted)
1415 RX_MATCH_TAINTED_on(rx);
1416 TAINT_IF(RX_MATCH_TAINTED(rx));
a0d0e21e 1417 if (gimme == G_ARRAY) {
a3b680e6
AL
1418 const I32 nparens = rx->nparens;
1419 I32 i = (global && !nparens) ? 1 : 0;
a0d0e21e 1420
c277df42 1421 SPAGAIN; /* EVAL blocks could move the stack. */
ffc61ed2
JH
1422 EXTEND(SP, nparens + i);
1423 EXTEND_MORTAL(nparens + i);
1424 for (i = !i; i <= nparens; i++) {
a0d0e21e 1425 PUSHs(sv_newmortal());
cf93c79d 1426 if ((rx->startp[i] != -1) && rx->endp[i] != -1 ) {
b464bac0 1427 const I32 len = rx->endp[i] - rx->startp[i];
289555fe 1428 s = rx->startp[i] + truebase;
290deeac
A
1429 if (rx->endp[i] < 0 || rx->startp[i] < 0 ||
1430 len < 0 || len > strend - s)
1431 DIE(aTHX_ "panic: pp_match start/end pointers");
a0d0e21e 1432 sv_setpvn(*SP, s, len);
cce850e4 1433 if (DO_UTF8(TARG) && is_utf8_string((U8*)s, len))
a197cbdd 1434 SvUTF8_on(*SP);
a0d0e21e
LW
1435 }
1436 }
1437 if (global) {
d65afb4b 1438 if (dynpm->op_pmflags & PMf_CONTINUE) {
6136c704 1439 MAGIC* mg = NULL;
0af80b60
HS
1440 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
1441 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1442 if (!mg) {
d83f0a82
NC
1443#ifdef PERL_OLD_COPY_ON_WRITE
1444 if (SvIsCOW(TARG))
1445 sv_force_normal_flags(TARG, 0);
1446#endif
1447 mg = sv_magicext(TARG, NULL, PERL_MAGIC_regex_global,
1448 &PL_vtbl_mglob, NULL, 0);
0af80b60
HS
1449 }
1450 if (rx->startp[0] != -1) {
1451 mg->mg_len = rx->endp[0];
70685ca0 1452 if (rx->startp[0] + rx->gofs == (UV)rx->endp[0])
0af80b60
HS
1453 mg->mg_flags |= MGf_MINMATCH;
1454 else
1455 mg->mg_flags &= ~MGf_MINMATCH;
1456 }
1457 }
cf93c79d 1458 had_zerolen = (rx->startp[0] != -1
70685ca0 1459 && rx->startp[0] + rx->gofs == (UV)rx->endp[0]);
c277df42 1460 PUTBACK; /* EVAL blocks may use stack */
cf93c79d 1461 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
1462 goto play_it_again;
1463 }
ffc61ed2 1464 else if (!nparens)
bde848c5 1465 XPUSHs(&PL_sv_yes);
4633a7c4 1466 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1467 RETURN;
1468 }
1469 else {
1470 if (global) {
cbbf8932 1471 MAGIC* mg;
a0d0e21e 1472 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
14befaf4 1473 mg = mg_find(TARG, PERL_MAGIC_regex_global);
cbbf8932
AL
1474 else
1475 mg = NULL;
a0d0e21e 1476 if (!mg) {
d83f0a82
NC
1477#ifdef PERL_OLD_COPY_ON_WRITE
1478 if (SvIsCOW(TARG))
1479 sv_force_normal_flags(TARG, 0);
1480#endif
1481 mg = sv_magicext(TARG, NULL, PERL_MAGIC_regex_global,
1482 &PL_vtbl_mglob, NULL, 0);
a0d0e21e 1483 }
cf93c79d
IZ
1484 if (rx->startp[0] != -1) {
1485 mg->mg_len = rx->endp[0];
70685ca0 1486 if (rx->startp[0] + rx->gofs == (UV)rx->endp[0])
748a9306
LW
1487 mg->mg_flags |= MGf_MINMATCH;
1488 else
1489 mg->mg_flags &= ~MGf_MINMATCH;
1490 }
a0d0e21e 1491 }
4633a7c4 1492 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1493 RETPUSHYES;
1494 }
1495
f722798b 1496yup: /* Confirmed by INTUIT */
72311751
GS
1497 if (rxtainted)
1498 RX_MATCH_TAINTED_on(rx);
1499 TAINT_IF(RX_MATCH_TAINTED(rx));
3280af22 1500 PL_curpm = pm;
d65afb4b
HS
1501 if (dynpm->op_pmflags & PMf_ONCE)
1502 dynpm->op_pmdynflags |= PMdf_USED;
cf93c79d
IZ
1503 if (RX_MATCH_COPIED(rx))
1504 Safefree(rx->subbeg);
1505 RX_MATCH_COPIED_off(rx);
6136c704 1506 rx->subbeg = NULL;
a0d0e21e 1507 if (global) {
5c144d81
NC
1508 /* FIXME - should rx->subbeg be const char *? */
1509 rx->subbeg = (char *) truebase;
cf93c79d 1510 rx->startp[0] = s - truebase;
a30b2f1f 1511 if (RX_MATCH_UTF8(rx)) {
de8c5301 1512 char * const t = (char*)utf8_hop((U8*)s, rx->minlenret);
60aeb6fd
NIS
1513 rx->endp[0] = t - truebase;
1514 }
1515 else {
de8c5301 1516 rx->endp[0] = s - truebase + rx->minlenret;
60aeb6fd 1517 }
cf93c79d 1518 rx->sublen = strend - truebase;
a0d0e21e 1519 goto gotcha;
1c846c1f 1520 }
cde0cee5 1521 if (PL_sawampersand || pm->op_pmflags & PMf_KEEPCOPY) {
14977893 1522 I32 off;
f8c7b90f 1523#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
1524 if (SvIsCOW(TARG) || (SvFLAGS(TARG) & CAN_COW_MASK) == CAN_COW_FLAGS) {
1525 if (DEBUG_C_TEST) {
1526 PerlIO_printf(Perl_debug_log,
1527 "Copy on write: pp_match $& capture, type %d, truebase=%p, t=%p, difference %d\n",
6c9570dc 1528 (int) SvTYPE(TARG), (void*)truebase, (void*)t,
ed252734
NC
1529 (int)(t-truebase));
1530 }
1531 rx->saved_copy = sv_setsv_cow(rx->saved_copy, TARG);
555831ce 1532 rx->subbeg = (char *) SvPVX_const(rx->saved_copy) + (t - truebase);
ed252734
NC
1533 assert (SvPOKp(rx->saved_copy));
1534 } else
1535#endif
1536 {
14977893 1537
ed252734 1538 rx->subbeg = savepvn(t, strend - t);
f8c7b90f 1539#ifdef PERL_OLD_COPY_ON_WRITE
a0714e2c 1540 rx->saved_copy = NULL;
ed252734
NC
1541#endif
1542 }
14977893
JH
1543 rx->sublen = strend - t;
1544 RX_MATCH_COPIED_on(rx);
1545 off = rx->startp[0] = s - t;
de8c5301 1546 rx->endp[0] = off + rx->minlenret;
14977893
JH
1547 }
1548 else { /* startp/endp are used by @- @+. */
1549 rx->startp[0] = s - truebase;
de8c5301 1550 rx->endp[0] = s - truebase + rx->minlenret;
14977893 1551 }
cde0cee5
YO
1552 /* including rx->nparens in the below code seems highly suspicious.
1553 -dmq */
2d862feb 1554 rx->nparens = rx->lastparen = rx->lastcloseparen = 0; /* used by @-, @+, and $^N */
4633a7c4 1555 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1556 RETPUSHYES;
1557
1558nope:
a0d0e21e 1559ret_no:
d65afb4b 1560 if (global && !(dynpm->op_pmflags & PMf_CONTINUE)) {
a0d0e21e 1561 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
6136c704 1562 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1563 if (mg)
565764a8 1564 mg->mg_len = -1;
a0d0e21e
LW
1565 }
1566 }
4633a7c4 1567 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1568 if (gimme == G_ARRAY)
1569 RETURN;
1570 RETPUSHNO;
1571}
1572
1573OP *
864dbfa3 1574Perl_do_readline(pTHX)
a0d0e21e 1575{
27da23d5 1576 dVAR; dSP; dTARGETSTACKED;
a0d0e21e
LW
1577 register SV *sv;
1578 STRLEN tmplen = 0;
1579 STRLEN offset;
760ac839 1580 PerlIO *fp;
a3b680e6
AL
1581 register IO * const io = GvIO(PL_last_in_gv);
1582 register const I32 type = PL_op->op_type;
1583 const I32 gimme = GIMME_V;
a0d0e21e 1584
6136c704
AL
1585 if (io) {
1586 MAGIC * const mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar);
1587 if (mg) {
1588 PUSHMARK(SP);
1589 XPUSHs(SvTIED_obj((SV*)io, mg));
1590 PUTBACK;
1591 ENTER;
1592 call_method("READLINE", gimme);
1593 LEAVE;
1594 SPAGAIN;
1595 if (gimme == G_SCALAR) {
1596 SV* const result = POPs;
1597 SvSetSV_nosteal(TARG, result);
1598 PUSHTARG;
1599 }
1600 RETURN;
0b7c7b4f 1601 }
e79b0511 1602 }
4608196e 1603 fp = NULL;
a0d0e21e
LW
1604 if (io) {
1605 fp = IoIFP(io);
1606 if (!fp) {
1607 if (IoFLAGS(io) & IOf_ARGV) {
1608 if (IoFLAGS(io) & IOf_START) {
a0d0e21e 1609 IoLINES(io) = 0;
3280af22 1610 if (av_len(GvAVn(PL_last_in_gv)) < 0) {
1d7c1841 1611 IoFLAGS(io) &= ~IOf_START;
4608196e 1612 do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,NULL);
c69033f2 1613 sv_setpvn(GvSVn(PL_last_in_gv), "-", 1);
3280af22 1614 SvSETMAGIC(GvSV(PL_last_in_gv));
a2008d6d
GS
1615 fp = IoIFP(io);
1616 goto have_fp;
a0d0e21e
LW
1617 }
1618 }
3280af22 1619 fp = nextargv(PL_last_in_gv);
a0d0e21e 1620 if (!fp) { /* Note: fp != IoIFP(io) */
3280af22 1621 (void)do_close(PL_last_in_gv, FALSE); /* now it does*/
a0d0e21e
LW
1622 }
1623 }
0d44d22b
NC
1624 else if (type == OP_GLOB)
1625 fp = Perl_start_glob(aTHX_ POPs, io);
a0d0e21e
LW
1626 }
1627 else if (type == OP_GLOB)
1628 SP--;
a00b5bd3 1629 else if (ckWARN(WARN_IO) && IoTYPE(io) == IoTYPE_WRONLY) {
4c80c0b2 1630 report_evil_fh(PL_last_in_gv, io, OP_phoney_OUTPUT_ONLY);
a00b5bd3 1631 }
a0d0e21e
LW
1632 }
1633 if (!fp) {
041457d9
DM
1634 if ((!io || !(IoFLAGS(io) & IOf_START))
1635 && ckWARN2(WARN_GLOB, WARN_CLOSED))
1636 {
3f4520fe 1637 if (type == OP_GLOB)
9014280d 1638 Perl_warner(aTHX_ packWARN(WARN_GLOB),
af8c498a
GS
1639 "glob failed (can't start child: %s)",
1640 Strerror(errno));
69282e91 1641 else
bc37a18f 1642 report_evil_fh(PL_last_in_gv, io, PL_op->op_type);
3f4520fe 1643 }
54310121 1644 if (gimme == G_SCALAR) {
79628082 1645 /* undef TARG, and push that undefined value */
ba92458f
AE
1646 if (type != OP_RCATLINE) {
1647 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1648 SvOK_off(TARG);
ba92458f 1649 }
a0d0e21e
LW
1650 PUSHTARG;
1651 }
1652 RETURN;
1653 }
a2008d6d 1654 have_fp:
54310121 1655 if (gimme == G_SCALAR) {
a0d0e21e 1656 sv = TARG;
0f722b55
RGS
1657 if (type == OP_RCATLINE && SvGMAGICAL(sv))
1658 mg_get(sv);
48de12d9
RGS
1659 if (SvROK(sv)) {
1660 if (type == OP_RCATLINE)
1661 SvPV_force_nolen(sv);
1662 else
1663 sv_unref(sv);
1664 }
f7877b28
NC
1665 else if (isGV_with_GP(sv)) {
1666 SvPV_force_nolen(sv);
1667 }
862a34c6 1668 SvUPGRADE(sv, SVt_PV);
a0d0e21e 1669 tmplen = SvLEN(sv); /* remember if already alloced */
bc44a8a2 1670 if (!tmplen && !SvREADONLY(sv))
a0d0e21e 1671 Sv_Grow(sv, 80); /* try short-buffering it */
2b5e58c4
AMS
1672 offset = 0;
1673 if (type == OP_RCATLINE && SvOK(sv)) {
1674 if (!SvPOK(sv)) {
8b6b16e7 1675 SvPV_force_nolen(sv);
2b5e58c4 1676 }
a0d0e21e 1677 offset = SvCUR(sv);
2b5e58c4 1678 }
a0d0e21e 1679 }
54310121 1680 else {
561b68a9 1681 sv = sv_2mortal(newSV(80));
54310121
PP
1682 offset = 0;
1683 }
fbad3eb5 1684
3887d568
AP
1685 /* This should not be marked tainted if the fp is marked clean */
1686#define MAYBE_TAINT_LINE(io, sv) \
1687 if (!(IoFLAGS(io) & IOf_UNTAINT)) { \
1688 TAINT; \
1689 SvTAINTED_on(sv); \
1690 }
1691
684bef36 1692/* delay EOF state for a snarfed empty file */
fbad3eb5 1693#define SNARF_EOF(gimme,rs,io,sv) \
684bef36 1694 (gimme != G_SCALAR || SvCUR(sv) \
b9fee9ba 1695 || (IoFLAGS(io) & IOf_NOLINE) || !RsSNARF(rs))
fbad3eb5 1696
a0d0e21e 1697 for (;;) {
09e8efcc 1698 PUTBACK;
fbad3eb5 1699 if (!sv_gets(sv, fp, offset)
2d726892
TF
1700 && (type == OP_GLOB
1701 || SNARF_EOF(gimme, PL_rs, io, sv)
1702 || PerlIO_error(fp)))
fbad3eb5 1703 {
760ac839 1704 PerlIO_clearerr(fp);
a0d0e21e 1705 if (IoFLAGS(io) & IOf_ARGV) {
3280af22 1706 fp = nextargv(PL_last_in_gv);
a0d0e21e
LW
1707 if (fp)
1708 continue;
3280af22 1709 (void)do_close(PL_last_in_gv, FALSE);
a0d0e21e
LW
1710 }
1711 else if (type == OP_GLOB) {
e476b1b5 1712 if (!do_close(PL_last_in_gv, FALSE) && ckWARN(WARN_GLOB)) {
9014280d 1713 Perl_warner(aTHX_ packWARN(WARN_GLOB),
4eb79ab5 1714 "glob failed (child exited with status %d%s)",
894356b3 1715 (int)(STATUS_CURRENT >> 8),
cf494569 1716 (STATUS_CURRENT & 0x80) ? ", core dumped" : "");
4eb79ab5 1717 }
a0d0e21e 1718 }
54310121 1719 if (gimme == G_SCALAR) {
ba92458f
AE
1720 if (type != OP_RCATLINE) {
1721 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1722 SvOK_off(TARG);
ba92458f 1723 }
09e8efcc 1724 SPAGAIN;
a0d0e21e
LW
1725 PUSHTARG;
1726 }
3887d568 1727 MAYBE_TAINT_LINE(io, sv);
a0d0e21e
LW
1728 RETURN;
1729 }
3887d568 1730 MAYBE_TAINT_LINE(io, sv);
a0d0e21e 1731 IoLINES(io)++;
b9fee9ba 1732 IoFLAGS(io) |= IOf_NOLINE;
71be2cbc 1733 SvSETMAGIC(sv);
09e8efcc 1734 SPAGAIN;
a0d0e21e 1735 XPUSHs(sv);
a0d0e21e 1736 if (type == OP_GLOB) {
349d4f2f 1737 const char *t1;
a0d0e21e 1738
3280af22 1739 if (SvCUR(sv) > 0 && SvCUR(PL_rs) > 0) {
6136c704 1740 char * const tmps = SvEND(sv) - 1;
aa07b2f6 1741 if (*tmps == *SvPVX_const(PL_rs)) {
c07a80fd 1742 *tmps = '\0';
b162af07 1743 SvCUR_set(sv, SvCUR(sv) - 1);
c07a80fd
PP
1744 }
1745 }
349d4f2f
NC
1746 for (t1 = SvPVX_const(sv); *t1; t1++)
1747 if (!isALPHA(*t1) && !isDIGIT(*t1) &&
1748 strchr("$&*(){}[]'\";\\|?<>~`", *t1))
a0d0e21e 1749 break;
349d4f2f 1750 if (*t1 && PerlLIO_lstat(SvPVX_const(sv), &PL_statbuf) < 0) {
a0d0e21e
LW
1751 (void)POPs; /* Unmatched wildcard? Chuck it... */
1752 continue;
1753 }
2d79bf7f 1754 } else if (SvUTF8(sv)) { /* OP_READLINE, OP_RCATLINE */
d4c19fe8
AL
1755 if (ckWARN(WARN_UTF8)) {
1756 const U8 * const s = (const U8*)SvPVX_const(sv) + offset;
1757 const STRLEN len = SvCUR(sv) - offset;
1758 const U8 *f;
1759
1760 if (!is_utf8_string_loc(s, len, &f))
1761 /* Emulate :encoding(utf8) warning in the same case. */
1762 Perl_warner(aTHX_ packWARN(WARN_UTF8),
1763 "utf8 \"\\x%02X\" does not map to Unicode",
1764 f < (U8*)SvEND(sv) ? *f : 0);
1765 }
a0d0e21e 1766 }
54310121 1767 if (gimme == G_ARRAY) {
a0d0e21e 1768 if (SvLEN(sv) - SvCUR(sv) > 20) {
1da4ca5f 1769 SvPV_shrink_to_cur(sv);
a0d0e21e 1770 }
561b68a9 1771 sv = sv_2mortal(newSV(80));
a0d0e21e
LW
1772 continue;
1773 }
54310121 1774 else if (gimme == G_SCALAR && !tmplen && SvLEN(sv) - SvCUR(sv) > 80) {
a0d0e21e 1775 /* try to reclaim a bit of scalar space (only on 1st alloc) */
d5b5861b
NC
1776 const STRLEN new_len
1777 = SvCUR(sv) < 60 ? 80 : SvCUR(sv)+40; /* allow some slop */
1da4ca5f 1778 SvPV_renew(sv, new_len);
a0d0e21e
LW
1779 }
1780 RETURN;
1781 }
1782}
1783
1784PP(pp_enter)
1785{
27da23d5 1786 dVAR; dSP;
c09156bb 1787 register PERL_CONTEXT *cx;
533c011a 1788 I32 gimme = OP_GIMME(PL_op, -1);
a0d0e21e 1789
54310121
PP
1790 if (gimme == -1) {
1791 if (cxstack_ix >= 0)
1792 gimme = cxstack[cxstack_ix].blk_gimme;
1793 else
1794 gimme = G_SCALAR;
1795 }
a0d0e21e
LW
1796
1797 ENTER;
1798
1799 SAVETMPS;
924508f0 1800 PUSHBLOCK(cx, CXt_BLOCK, SP);
a0d0e21e
LW
1801
1802 RETURN;
1803}
1804
1805PP(pp_helem)
1806{
97aff369 1807 dVAR; dSP;
760ac839 1808 HE* he;
ae77835f 1809 SV **svp;
c445ea15
AL
1810 SV * const keysv = POPs;
1811 HV * const hv = (HV*)POPs;
a3b680e6
AL
1812 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
1813 const U32 defer = PL_op->op_private & OPpLVAL_DEFER;
be6c24e0 1814 SV *sv;
c158a4fd 1815 const U32 hash = (SvIsCOW_shared_hash(keysv)) ? SvSHARED_HASH(keysv) : 0;
9c5ffd7c 1816 I32 preeminent = 0;
a0d0e21e 1817
d4c19fe8 1818 if (SvTYPE(hv) != SVt_PVHV)
a0d0e21e 1819 RETPUSHUNDEF;
d4c19fe8
AL
1820
1821 if (PL_op->op_private & OPpLVAL_INTRO) {
1822 MAGIC *mg;
1823 HV *stash;
1824 /* does the element we're localizing already exist? */
1825 preeminent = /* can we determine whether it exists? */
1826 ( !SvRMAGICAL(hv)
1827 || mg_find((SV*)hv, PERL_MAGIC_env)
1828 || ( (mg = mg_find((SV*)hv, PERL_MAGIC_tied))
1829 /* Try to preserve the existenceness of a tied hash
1830 * element by using EXISTS and DELETE if possible.
1831 * Fallback to FETCH and STORE otherwise */
1832 && (stash = SvSTASH(SvRV(SvTIED_obj((SV*)hv, mg))))
1833 && gv_fetchmethod_autoload(stash, "EXISTS", TRUE)
1834 && gv_fetchmethod_autoload(stash, "DELETE", TRUE)
1835 )
1836 ) ? hv_exists_ent(hv, keysv, 0) : 1;
1837 }
1838 he = hv_fetch_ent(hv, keysv, lval && !defer, hash);
1839 svp = he ? &HeVAL(he) : NULL;
a0d0e21e 1840 if (lval) {
3280af22 1841 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
1842 SV* lv;
1843 SV* key2;
2d8e6c8d 1844 if (!defer) {
be2597df 1845 DIE(aTHX_ PL_no_helem_sv, SVfARG(keysv));
2d8e6c8d 1846 }
68dc0745
PP
1847 lv = sv_newmortal();
1848 sv_upgrade(lv, SVt_PVLV);
1849 LvTYPE(lv) = 'y';
6136c704 1850 sv_magic(lv, key2 = newSVsv(keysv), PERL_MAGIC_defelem, NULL, 0);
68dc0745 1851 SvREFCNT_dec(key2); /* sv_magic() increments refcount */
b37c2d43 1852 LvTARG(lv) = SvREFCNT_inc_simple(hv);
68dc0745
PP
1853 LvTARGLEN(lv) = 1;
1854 PUSHs(lv);
1855 RETURN;
1856 }
533c011a 1857 if (PL_op->op_private & OPpLVAL_INTRO) {
bfcb3514 1858 if (HvNAME_get(hv) && isGV(*svp))
533c011a 1859 save_gp((GV*)*svp, !(PL_op->op_flags & OPf_SPECIAL));
1f5346dc
SC
1860 else {
1861 if (!preeminent) {
1862 STRLEN keylen;
e62f0680 1863 const char * const key = SvPV_const(keysv, keylen);
7d654f43 1864 SAVEDELETE(hv, savepvn(key,keylen),
bb7a0f54 1865 SvUTF8(keysv) ? -(I32)keylen : (I32)keylen);
bfc4de9f 1866 } else
1f5346dc
SC
1867 save_helem(hv, keysv, svp);
1868 }
5f05dabc 1869 }
533c011a
NIS
1870 else if (PL_op->op_private & OPpDEREF)
1871 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 1872 }
3280af22 1873 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
1874 /* This makes C<local $tied{foo} = $tied{foo}> possible.
1875 * Pushing the magical RHS on to the stack is useless, since
1876 * that magic is soon destined to be misled by the local(),
1877 * and thus the later pp_sassign() will fail to mg_get() the
1878 * old value. This should also cure problems with delayed
1879 * mg_get()s. GSAR 98-07-03 */
1880 if (!lval && SvGMAGICAL(sv))
1881 sv = sv_mortalcopy(sv);
1882 PUSHs(sv);
a0d0e21e
LW
1883 RETURN;
1884}
1885
1886PP(pp_leave)
1887{
27da23d5 1888 dVAR; dSP;
c09156bb 1889 register PERL_CONTEXT *cx;
a0d0e21e
LW
1890 SV **newsp;
1891 PMOP *newpm;
1892 I32 gimme;
1893
533c011a 1894 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e 1895 cx = &cxstack[cxstack_ix];
3280af22 1896 cx->blk_oldpm = PL_curpm; /* fake block should preserve $1 et al */
a0d0e21e
LW
1897 }
1898
1899 POPBLOCK(cx,newpm);
1900
533c011a 1901 gimme = OP_GIMME(PL_op, -1);
54310121
PP
1902 if (gimme == -1) {
1903 if (cxstack_ix >= 0)
1904 gimme = cxstack[cxstack_ix].blk_gimme;
1905 else
1906 gimme = G_SCALAR;
1907 }
a0d0e21e 1908
a1f49e72 1909 TAINT_NOT;
54310121
PP
1910 if (gimme == G_VOID)
1911 SP = newsp;
1912 else if (gimme == G_SCALAR) {
a3b680e6 1913 register SV **mark;
54310121 1914 MARK = newsp + 1;
09256e2f 1915 if (MARK <= SP) {
54310121
PP
1916 if (SvFLAGS(TOPs) & (SVs_PADTMP|SVs_TEMP))
1917 *MARK = TOPs;
1918 else
1919 *MARK = sv_mortalcopy(TOPs);
09256e2f 1920 } else {
54310121 1921 MEXTEND(mark,0);
3280af22 1922 *MARK = &PL_sv_undef;
a0d0e21e 1923 }
54310121 1924 SP = MARK;
a0d0e21e 1925 }
54310121 1926 else if (gimme == G_ARRAY) {
a1f49e72 1927 /* in case LEAVE wipes old return values */
a3b680e6 1928 register SV **mark;
a1f49e72
CS
1929 for (mark = newsp + 1; mark <= SP; mark++) {
1930 if (!(SvFLAGS(*mark) & (SVs_PADTMP|SVs_TEMP))) {
a0d0e21e 1931 *mark = sv_mortalcopy(*mark);
a1f49e72
CS
1932 TAINT_NOT; /* Each item is independent */
1933 }
1934 }
a0d0e21e 1935 }
3280af22 1936 PL_curpm = newpm; /* Don't pop $1 et al till now */
a0d0e21e
LW
1937
1938 LEAVE;
1939
1940 RETURN;
1941}
1942
1943PP(pp_iter)
1944{
97aff369 1945 dVAR; dSP;
c09156bb 1946 register PERL_CONTEXT *cx;
dc09a129 1947 SV *sv, *oldsv;
4633a7c4 1948 AV* av;
1d7c1841 1949 SV **itersvp;
a0d0e21e 1950
924508f0 1951 EXTEND(SP, 1);
a0d0e21e 1952 cx = &cxstack[cxstack_ix];
6b35e009 1953 if (CxTYPE(cx) != CXt_LOOP)
cea2e8a9 1954 DIE(aTHX_ "panic: pp_iter");
a0d0e21e 1955
1d7c1841 1956 itersvp = CxITERVAR(cx);
4633a7c4 1957 av = cx->blk_loop.iterary;
89ea2908
GA
1958 if (SvTYPE(av) != SVt_PVAV) {
1959 /* iterate ($min .. $max) */
1960 if (cx->blk_loop.iterlval) {
1961 /* string increment */
1962 register SV* cur = cx->blk_loop.iterlval;
4fe3f0fa 1963 STRLEN maxlen = 0;
10edeb5d
JH
1964 const char *max =
1965 SvOK((SV*)av) ?
1966 SvPV_const((SV*)av, maxlen) : (const char *)"";
89ea2908 1967 if (!SvNIOK(cur) && SvCUR(cur) <= maxlen) {
1d7c1841 1968 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1969 /* safe to reuse old SV */
1d7c1841 1970 sv_setsv(*itersvp, cur);
eaa5c2d6 1971 }
1c846c1f 1972 else
eaa5c2d6
GA
1973 {
1974 /* we need a fresh SV every time so that loop body sees a
1975 * completely new SV for closures/references to work as
1976 * they used to */
dc09a129 1977 oldsv = *itersvp;
1d7c1841 1978 *itersvp = newSVsv(cur);
dc09a129 1979 SvREFCNT_dec(oldsv);
eaa5c2d6 1980 }
aa07b2f6 1981 if (strEQ(SvPVX_const(cur), max))
89ea2908
GA
1982 sv_setiv(cur, 0); /* terminate next time */
1983 else
1984 sv_inc(cur);
1985 RETPUSHYES;
1986 }
1987 RETPUSHNO;
1988 }
1989 /* integer increment */
1990 if (cx->blk_loop.iterix > cx->blk_loop.itermax)
1991 RETPUSHNO;
7f61b687 1992
3db8f154 1993 /* don't risk potential race */
1d7c1841 1994 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1995 /* safe to reuse old SV */
1d7c1841 1996 sv_setiv(*itersvp, cx->blk_loop.iterix++);
eaa5c2d6 1997 }
1c846c1f 1998 else
eaa5c2d6
GA
1999 {
2000 /* we need a fresh SV every time so that loop body sees a
2001 * completely new SV for closures/references to work as they
2002 * used to */
dc09a129 2003 oldsv = *itersvp;
1d7c1841 2004 *itersvp = newSViv(cx->blk_loop.iterix++);
dc09a129 2005 SvREFCNT_dec(oldsv);
eaa5c2d6 2006 }
89ea2908
GA
2007 RETPUSHYES;
2008 }
2009
2010 /* iterate array */
ef3e5ea9
NC
2011 if (PL_op->op_private & OPpITER_REVERSED) {
2012 /* In reverse, use itermax as the min :-) */
c491ecac 2013 if (cx->blk_loop.iterix <= cx->blk_loop.itermax)
ef3e5ea9 2014 RETPUSHNO;
a0d0e21e 2015
ef3e5ea9 2016 if (SvMAGICAL(av) || AvREIFY(av)) {
c445ea15 2017 SV * const * const svp = av_fetch(av, --cx->blk_loop.iterix, FALSE);
a0714e2c 2018 sv = svp ? *svp : NULL;
ef3e5ea9
NC
2019 }
2020 else {
6e585ca0 2021 sv = AvARRAY(av)[--cx->blk_loop.iterix];
ef3e5ea9 2022 }
d42935ef
JH
2023 }
2024 else {
ef3e5ea9
NC
2025 if (cx->blk_loop.iterix >= (av == PL_curstack ? cx->blk_oldsp :
2026 AvFILL(av)))
2027 RETPUSHNO;
2028
2029 if (SvMAGICAL(av) || AvREIFY(av)) {
c445ea15 2030 SV * const * const svp = av_fetch(av, ++cx->blk_loop.iterix, FALSE);
a0714e2c 2031 sv = svp ? *svp : NULL;
ef3e5ea9
NC
2032 }
2033 else {
2034 sv = AvARRAY(av)[++cx->blk_loop.iterix];
2035 }
d42935ef 2036 }
ef3e5ea9 2037
0565a181 2038 if (sv && SvIS_FREED(sv)) {
a0714e2c 2039 *itersvp = NULL;
b6c83531 2040 Perl_croak(aTHX_ "Use of freed value in iteration");
cccede53
DM
2041 }
2042
d42935ef 2043 if (sv)
a0d0e21e 2044 SvTEMP_off(sv);
a0d0e21e 2045 else
3280af22 2046 sv = &PL_sv_undef;
8b530633 2047 if (av != PL_curstack && sv == &PL_sv_undef) {
5f05dabc 2048 SV *lv = cx->blk_loop.iterlval;
71be2cbc
PP
2049 if (lv && SvREFCNT(lv) > 1) {
2050 SvREFCNT_dec(lv);
a0714e2c 2051 lv = NULL;
71be2cbc 2052 }
5f05dabc
PP
2053 if (lv)
2054 SvREFCNT_dec(LvTARG(lv));
2055 else {
561b68a9 2056 lv = cx->blk_loop.iterlval = newSV(0);
5f05dabc 2057 sv_upgrade(lv, SVt_PVLV);
5f05dabc 2058 LvTYPE(lv) = 'y';
6136c704 2059 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
5f05dabc 2060 }
b37c2d43 2061 LvTARG(lv) = SvREFCNT_inc_simple(av);
5f05dabc 2062 LvTARGOFF(lv) = cx->blk_loop.iterix;
42718184 2063 LvTARGLEN(lv) = (STRLEN)UV_MAX;
5f05dabc
PP
2064 sv = (SV*)lv;
2065 }
a0d0e21e 2066
dc09a129 2067 oldsv = *itersvp;
b37c2d43 2068 *itersvp = SvREFCNT_inc_simple_NN(sv);
dc09a129
DM
2069 SvREFCNT_dec(oldsv);
2070
a0d0e21e
LW
2071 RETPUSHYES;
2072}
2073
2074PP(pp_subst)
2075{
97aff369 2076 dVAR; dSP; dTARG;
a0d0e21e
LW
2077 register PMOP *pm = cPMOP;
2078 PMOP *rpm = pm;
a0d0e21e
LW
2079 register char *s;
2080 char *strend;
2081 register char *m;
5c144d81 2082 const char *c;
a0d0e21e
LW
2083 register char *d;
2084 STRLEN clen;
2085 I32 iters = 0;
2086 I32 maxiters;
2087 register I32 i;
2088 bool once;
71be2cbc 2089 bool rxtainted;
a0d0e21e 2090 char *orig;
22e551b9 2091 I32 r_flags;
aaa362c4 2092 register REGEXP *rx = PM_GETRE(pm);
a0d0e21e
LW
2093 STRLEN len;
2094 int force_on_match = 0;
0bcc34c2 2095 const I32 oldsave = PL_savestack_ix;
792b2c16 2096 STRLEN slen;
f272994b 2097 bool doutf8 = FALSE;
f8c7b90f 2098#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2099 bool is_cow;
2100#endif
a0714e2c 2101 SV *nsv = NULL;
a0d0e21e 2102
5cd24f17 2103 /* known replacement string? */
b37c2d43 2104 register SV *dstr = (pm->op_pmflags & PMf_CONST) ? POPs : NULL;
533c011a 2105 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 2106 TARG = POPs;
59f00321
RGS
2107 else if (PL_op->op_private & OPpTARGET_MY)
2108 GETTARGET;
a0d0e21e 2109 else {
54b9620d 2110 TARG = DEFSV;
a0d0e21e 2111 EXTEND(SP,1);
1c846c1f 2112 }
d9f424b2 2113
f8c7b90f 2114#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2115 /* Awooga. Awooga. "bool" types that are actually char are dangerous,
2116 because they make integers such as 256 "false". */
2117 is_cow = SvIsCOW(TARG) ? TRUE : FALSE;
2118#else
765f542d
NC
2119 if (SvIsCOW(TARG))
2120 sv_force_normal_flags(TARG,0);
ed252734
NC
2121#endif
2122 if (
f8c7b90f 2123#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2124 !is_cow &&
2125#endif
2126 (SvREADONLY(TARG)
cecf5685
NC
2127 || ( ((SvTYPE(TARG) == SVt_PVGV && isGV_with_GP(TARG))
2128 || SvTYPE(TARG) > SVt_PVLV)
4ce457a6 2129 && !(SvTYPE(TARG) == SVt_PVGV && SvFAKE(TARG)))))
d470f89e 2130 DIE(aTHX_ PL_no_modify);
8ec5e241
NIS
2131 PUTBACK;
2132
d5263905 2133 s = SvPV_mutable(TARG, len);
68dc0745 2134 if (!SvPOKp(TARG) || SvTYPE(TARG) == SVt_PVGV)
a0d0e21e 2135 force_on_match = 1;
b3eb6a9b 2136 rxtainted = ((pm->op_pmdynflags & PMdf_TAINTED) ||
3280af22
NIS
2137 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
2138 if (PL_tainted)
b3eb6a9b 2139 rxtainted |= 2;
9212bbba 2140 TAINT_NOT;
a12c0f56 2141
a30b2f1f 2142 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 2143
a0d0e21e
LW
2144 force_it:
2145 if (!pm || !s)
2269b42e 2146 DIE(aTHX_ "panic: pp_subst");
a0d0e21e
LW
2147
2148 strend = s + len;
a30b2f1f 2149 slen = RX_MATCH_UTF8(rx) ? utf8_length((U8*)s, (U8*)strend) : len;
792b2c16
JH
2150 maxiters = 2 * slen + 10; /* We can match twice at each
2151 position, once with zero-length,
2152 second time with non-zero. */
a0d0e21e 2153
3280af22
NIS
2154 if (!rx->prelen && PL_curpm) {
2155 pm = PL_curpm;
aaa362c4 2156 rx = PM_GETRE(pm);
a0d0e21e 2157 }
0b78c20a 2158 r_flags = (rx->nparens || SvTEMP(TARG) || PL_sawampersand
cde0cee5 2159 || (pm->op_pmflags & (PMf_EVAL|PMf_KEEPCOPY)) )
ed252734 2160 ? REXEC_COPY_STR : 0;
f722798b 2161 if (SvSCREAM(TARG))
22e551b9 2162 r_flags |= REXEC_SCREAM;
7fba1cd6 2163
a0d0e21e 2164 orig = m = s;
bbe252da 2165 if (rx->extflags & RXf_USE_INTUIT) {
ee0b7718 2166 PL_bostr = orig;
f9f4320a 2167 s = CALLREG_INTUIT_START(rx, TARG, s, strend, r_flags, NULL);
f722798b
IZ
2168
2169 if (!s)
2170 goto nope;
2171 /* How to do it in subst? */
bbe252da 2172/* if ( (rx->extflags & RXf_CHECK_ALL)
1c846c1f 2173 && !PL_sawampersand
cde0cee5 2174 && !(pm->op_pmflags & PMf_KEEPCOPY)
bbe252da
YO
2175 && ((rx->extflags & RXf_NOSCAN)
2176 || !((rx->extflags & RXf_INTUIT_TAIL)
f722798b
IZ
2177 && (r_flags & REXEC_SCREAM))))
2178 goto yup;
2179*/
a0d0e21e 2180 }
71be2cbc
PP
2181
2182 /* only replace once? */
a0d0e21e 2183 once = !(rpm->op_pmflags & PMf_GLOBAL);
71be2cbc
PP
2184
2185 /* known replacement string? */
f272994b 2186 if (dstr) {
8514a05a
JH
2187 /* replacement needing upgrading? */
2188 if (DO_UTF8(TARG) && !doutf8) {
db79b45b 2189 nsv = sv_newmortal();
4a176938 2190 SvSetSV(nsv, dstr);
8514a05a
JH
2191 if (PL_encoding)
2192 sv_recode_to_utf8(nsv, PL_encoding);
2193 else
2194 sv_utf8_upgrade(nsv);
5c144d81 2195 c = SvPV_const(nsv, clen);
4a176938
JH
2196 doutf8 = TRUE;
2197 }
2198 else {
5c144d81 2199 c = SvPV_const(dstr, clen);
4a176938 2200 doutf8 = DO_UTF8(dstr);
8514a05a 2201 }
f272994b
A
2202 }
2203 else {
6136c704 2204 c = NULL;
f272994b
A
2205 doutf8 = FALSE;
2206 }
2207
71be2cbc 2208 /* can do inplace substitution? */
ed252734 2209 if (c
f8c7b90f 2210#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2211 && !is_cow
2212#endif
de8c5301 2213 && (I32)clen <= rx->minlenret && (once || !(r_flags & REXEC_COPY_STR))
bbe252da 2214 && !(rx->extflags & RXf_LOOKBEHIND_SEEN)
db79b45b 2215 && (!doutf8 || SvUTF8(TARG))) {
f9f4320a 2216 if (!CALLREGEXEC(rx, s, strend, orig, 0, TARG, NULL,
f722798b
IZ
2217 r_flags | REXEC_CHECKED))
2218 {
8ec5e241 2219 SPAGAIN;
3280af22 2220 PUSHs(&PL_sv_no);
71be2cbc
PP
2221 LEAVE_SCOPE(oldsave);
2222 RETURN;
2223 }
f8c7b90f 2224#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2225 if (SvIsCOW(TARG)) {
2226 assert (!force_on_match);
2227 goto have_a_cow;
2228 }
2229#endif
71be2cbc
PP
2230 if (force_on_match) {
2231 force_on_match = 0;
2232 s = SvPV_force(TARG, len);
2233 goto force_it;
2234 }
71be2cbc 2235 d = s;
3280af22 2236 PL_curpm = pm;
71be2cbc
PP
2237 SvSCREAM_off(TARG); /* disable possible screamer */
2238 if (once) {
48c036b1 2239 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d
IZ
2240 m = orig + rx->startp[0];
2241 d = orig + rx->endp[0];
71be2cbc
PP
2242 s = orig;
2243 if (m - s > strend - d) { /* faster to shorten from end */
2244 if (clen) {
2245 Copy(c, m, clen, char);
2246 m += clen;
a0d0e21e 2247 }
71be2cbc
PP
2248 i = strend - d;
2249 if (i > 0) {
2250 Move(d, m, i, char);
2251 m += i;
a0d0e21e 2252 }
71be2cbc
PP
2253 *m = '\0';
2254 SvCUR_set(TARG, m - s);
2255 }
155aba94 2256 else if ((i = m - s)) { /* faster from front */
71be2cbc
PP
2257 d -= clen;
2258 m = d;
2259 sv_chop(TARG, d-i);
2260 s += i;
2261 while (i--)
2262 *--d = *--s;
2263 if (clen)
2264 Copy(c, m, clen, char);
2265 }
2266 else if (clen) {
2267 d -= clen;
2268 sv_chop(TARG, d);
2269 Copy(c, d, clen, char);
2270 }
2271 else {
2272 sv_chop(TARG, d);
2273 }
48c036b1 2274 TAINT_IF(rxtainted & 1);
8ec5e241 2275 SPAGAIN;
3280af22 2276 PUSHs(&PL_sv_yes);
71be2cbc
PP
2277 }
2278 else {
71be2cbc
PP
2279 do {
2280 if (iters++ > maxiters)
cea2e8a9 2281 DIE(aTHX_ "Substitution loop");
d9f97599 2282 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d 2283 m = rx->startp[0] + orig;
155aba94 2284 if ((i = m - s)) {
71be2cbc
PP
2285 if (s != d)
2286 Move(s, d, i, char);
2287 d += i;
a0d0e21e 2288 }
71be2cbc
PP
2289 if (clen) {
2290 Copy(c, d, clen, char);
2291 d += clen;
2292 }
cf93c79d 2293 s = rx->endp[0] + orig;
f9f4320a 2294 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
f722798b
IZ
2295 TARG, NULL,
2296 /* don't match same null twice */
2297 REXEC_NOT_FIRST|REXEC_IGNOREPOS));
71be2cbc
PP
2298 if (s != d) {
2299 i = strend - s;
aa07b2f6 2300 SvCUR_set(TARG, d - SvPVX_const(TARG) + i);
71be2cbc 2301 Move(s, d, i+1, char); /* include the NUL */
a0d0e21e 2302 }
48c036b1 2303 TAINT_IF(rxtainted & 1);
8ec5e241 2304 SPAGAIN;
71be2cbc 2305 PUSHs(sv_2mortal(newSViv((I32)iters)));
a0d0e21e 2306 }
80b498e0 2307 (void)SvPOK_only_UTF8(TARG);
48c036b1 2308 TAINT_IF(rxtainted);
8ec5e241
NIS
2309 if (SvSMAGICAL(TARG)) {
2310 PUTBACK;
2311 mg_set(TARG);
2312 SPAGAIN;
2313 }
9212bbba 2314 SvTAINT(TARG);
aefe6dfc
JH
2315 if (doutf8)
2316 SvUTF8_on(TARG);
71be2cbc
PP
2317 LEAVE_SCOPE(oldsave);
2318 RETURN;
a0d0e21e 2319 }
71be2cbc 2320
f9f4320a 2321 if (CALLREGEXEC(rx, s, strend, orig, 0, TARG, NULL,
f722798b
IZ
2322 r_flags | REXEC_CHECKED))
2323 {
a0d0e21e
LW
2324 if (force_on_match) {
2325 force_on_match = 0;
2326 s = SvPV_force(TARG, len);
2327 goto force_it;
2328 }
f8c7b90f 2329#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2330 have_a_cow:
2331#endif
48c036b1 2332 rxtainted |= RX_MATCH_TAINTED(rx);
f2b990bf 2333 dstr = newSVpvn(m, s-m);
cff085c1 2334 SAVEFREESV(dstr);
ffc61ed2
JH
2335 if (DO_UTF8(TARG))
2336 SvUTF8_on(dstr);
3280af22 2337 PL_curpm = pm;
a0d0e21e 2338 if (!c) {
c09156bb 2339 register PERL_CONTEXT *cx;
8ec5e241 2340 SPAGAIN;
a0d0e21e
LW
2341 PUSHSUBST(cx);
2342 RETURNOP(cPMOP->op_pmreplroot);
2343 }
cf93c79d 2344 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
2345 do {
2346 if (iters++ > maxiters)
cea2e8a9 2347 DIE(aTHX_ "Substitution loop");
d9f97599 2348 rxtainted |= RX_MATCH_TAINTED(rx);
cf93c79d 2349 if (RX_MATCH_COPIED(rx) && rx->subbeg != orig) {
a0d0e21e
LW
2350 m = s;
2351 s = orig;
cf93c79d 2352 orig = rx->subbeg;
a0d0e21e
LW
2353 s = orig + (m - s);
2354 strend = s + (strend - m);
2355 }
cf93c79d 2356 m = rx->startp[0] + orig;
db79b45b
JH
2357 if (doutf8 && !SvUTF8(dstr))
2358 sv_catpvn_utf8_upgrade(dstr, s, m - s, nsv);
2359 else
2360 sv_catpvn(dstr, s, m-s);
cf93c79d 2361 s = rx->endp[0] + orig;
a0d0e21e
LW
2362 if (clen)
2363 sv_catpvn(dstr, c, clen);
2364 if (once)
2365 break;
f9f4320a 2366 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
ffc61ed2 2367 TARG, NULL, r_flags));
db79b45b
JH
2368 if (doutf8 && !DO_UTF8(TARG))
2369 sv_catpvn_utf8_upgrade(dstr, s, strend - s, nsv);
89afcb60
A
2370 else
2371 sv_catpvn(dstr, s, strend - s);
748a9306 2372
f8c7b90f 2373#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2374 /* The match may make the string COW. If so, brilliant, because that's
2375 just saved us one malloc, copy and free - the regexp has donated
2376 the old buffer, and we malloc an entirely new one, rather than the
2377 regexp malloc()ing a buffer and copying our original, only for
2378 us to throw it away here during the substitution. */
2379 if (SvIsCOW(TARG)) {
2380 sv_force_normal_flags(TARG, SV_COW_DROP_PV);
2381 } else
2382#endif
2383 {
8bd4d4c5 2384 SvPV_free(TARG);
ed252734 2385 }
f880fe2f 2386 SvPV_set(TARG, SvPVX(dstr));
748a9306
LW
2387 SvCUR_set(TARG, SvCUR(dstr));
2388 SvLEN_set(TARG, SvLEN(dstr));
f272994b 2389 doutf8 |= DO_UTF8(dstr);
6136c704 2390 SvPV_set(dstr, NULL);
748a9306 2391
48c036b1 2392 TAINT_IF(rxtainted & 1);
f878fbec 2393 SPAGAIN;
48c036b1
GS
2394 PUSHs(sv_2mortal(newSViv((I32)iters)));
2395
a0d0e21e 2396 (void)SvPOK_only(TARG);
f272994b 2397 if (doutf8)
60aeb6fd 2398 SvUTF8_on(TARG);
48c036b1 2399 TAINT_IF(rxtainted);
a0d0e21e 2400 SvSETMAGIC(TARG);
9212bbba 2401 SvTAINT(TARG);
4633a7c4 2402 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2403 RETURN;
2404 }
5cd24f17 2405 goto ret_no;
a0d0e21e
LW
2406
2407nope:
1c846c1f 2408ret_no:
8ec5e241 2409 SPAGAIN;
3280af22 2410 PUSHs(&PL_sv_no);
4633a7c4 2411 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2412 RETURN;
2413}
2414
2415PP(pp_grepwhile)
2416{
27da23d5 2417 dVAR; dSP;
a0d0e21e
LW
2418
2419 if (SvTRUEx(POPs))
3280af22
NIS
2420 PL_stack_base[PL_markstack_ptr[-1]++] = PL_stack_base[*PL_markstack_ptr];
2421 ++*PL_markstack_ptr;
a0d0e21e
LW
2422 LEAVE; /* exit inner scope */
2423
2424 /* All done yet? */
3280af22 2425 if (PL_stack_base + *PL_markstack_ptr > SP) {
a0d0e21e 2426 I32 items;
c4420975 2427 const I32 gimme = GIMME_V;
a0d0e21e
LW
2428
2429 LEAVE; /* exit outer scope */
2430 (void)POPMARK; /* pop src */
3280af22 2431 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 2432 (void)POPMARK; /* pop dst */
3280af22 2433 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 2434 if (gimme == G_SCALAR) {
7cc47870 2435 if (PL_op->op_private & OPpGREP_LEX) {
c4420975 2436 SV* const sv = sv_newmortal();
7cc47870
RGS
2437 sv_setiv(sv, items);
2438 PUSHs(sv);
2439 }
2440 else {
2441 dTARGET;
2442 XPUSHi(items);
2443 }
a0d0e21e 2444 }
54310121
PP
2445 else if (gimme == G_ARRAY)
2446 SP += items;
a0d0e21e
LW
2447 RETURN;
2448 }
2449 else {
2450 SV *src;
2451
2452 ENTER; /* enter inner scope */
1d7c1841 2453 SAVEVPTR(PL_curpm);
a0d0e21e 2454
3280af22 2455 src = PL_stack_base[*PL_markstack_ptr];
a0d0e21e 2456 SvTEMP_off(src);
59f00321
RGS
2457 if (PL_op->op_private & OPpGREP_LEX)
2458 PAD_SVl(PL_op->op_targ) = src;
2459 else
2460 DEFSV = src;
a0d0e21e
LW
2461
2462 RETURNOP(cLOGOP->op_other);
2463 }
2464}
2465
2466PP(pp_leavesub)
2467{
27da23d5 2468 dVAR; dSP;
a0d0e21e
LW
2469 SV **mark;
2470 SV **newsp;
2471 PMOP *newpm;
2472 I32 gimme;
c09156bb 2473 register PERL_CONTEXT *cx;
b0d9ce38 2474 SV *sv;
a0d0e21e 2475
9850bf21
RH
2476 if (CxMULTICALL(&cxstack[cxstack_ix]))
2477 return 0;
2478
a0d0e21e 2479 POPBLOCK(cx,newpm);
5dd42e15 2480 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2481
a1f49e72 2482 TAINT_NOT;
a0d0e21e
LW
2483 if (gimme == G_SCALAR) {
2484 MARK = newsp + 1;
a29cdaf0 2485 if (MARK <= SP) {
a8bba7fa 2486 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
a29cdaf0
IZ
2487 if (SvTEMP(TOPs)) {
2488 *MARK = SvREFCNT_inc(TOPs);
2489 FREETMPS;
2490 sv_2mortal(*MARK);
cd06dffe
GS
2491 }
2492 else {
959e3673 2493 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
a29cdaf0 2494 FREETMPS;
959e3673
GS
2495 *MARK = sv_mortalcopy(sv);
2496 SvREFCNT_dec(sv);
a29cdaf0 2497 }
cd06dffe
GS
2498 }
2499 else
a29cdaf0 2500 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
cd06dffe
GS
2501 }
2502 else {
f86702cc 2503 MEXTEND(MARK, 0);
3280af22 2504 *MARK = &PL_sv_undef;
a0d0e21e
LW
2505 }
2506 SP = MARK;
2507 }
54310121 2508 else if (gimme == G_ARRAY) {
f86702cc 2509 for (MARK = newsp + 1; MARK <= SP; MARK++) {
a1f49e72 2510 if (!SvTEMP(*MARK)) {
f86702cc 2511 *MARK = sv_mortalcopy(*MARK);
a1f49e72
CS
2512 TAINT_NOT; /* Each item is independent */
2513 }
f86702cc 2514 }
a0d0e21e 2515 }
f86702cc 2516 PUTBACK;
1c846c1f 2517
5dd42e15
DM
2518 LEAVE;
2519 cxstack_ix--;
b0d9ce38 2520 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
3280af22 2521 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e 2522
b0d9ce38 2523 LEAVESUB(sv);
f39bc417 2524 return cx->blk_sub.retop;
a0d0e21e
LW
2525}
2526
cd06dffe
GS
2527/* This duplicates the above code because the above code must not
2528 * get any slower by more conditions */
2529PP(pp_leavesublv)
2530{
27da23d5 2531 dVAR; dSP;
cd06dffe
GS
2532 SV **mark;
2533 SV **newsp;
2534 PMOP *newpm;
2535 I32 gimme;
2536 register PERL_CONTEXT *cx;
b0d9ce38 2537 SV *sv;
cd06dffe 2538
9850bf21
RH
2539 if (CxMULTICALL(&cxstack[cxstack_ix]))
2540 return 0;
2541
cd06dffe 2542 POPBLOCK(cx,newpm);
5dd42e15 2543 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2544
cd06dffe
GS
2545 TAINT_NOT;
2546
cc8d50a7 2547 if (cx->blk_sub.lval & OPpENTERSUB_INARGS) {
cd06dffe
GS
2548 /* We are an argument to a function or grep().
2549 * This kind of lvalueness was legal before lvalue
2550 * subroutines too, so be backward compatible:
2551 * cannot report errors. */
2552
2553 /* Scalar context *is* possible, on the LHS of -> only,
2554 * as in f()->meth(). But this is not an lvalue. */
2555 if (gimme == G_SCALAR)
2556 goto temporise;
2557 if (gimme == G_ARRAY) {
a8bba7fa 2558 if (!CvLVALUE(cx->blk_sub.cv))
cd06dffe
GS
2559 goto temporise_array;
2560 EXTEND_MORTAL(SP - newsp);
2561 for (mark = newsp + 1; mark <= SP; mark++) {
2562 if (SvTEMP(*mark))
6f207bd3 2563 NOOP;
cd06dffe
GS
2564 else if (SvFLAGS(*mark) & (SVs_PADTMP | SVf_READONLY))
2565 *mark = sv_mortalcopy(*mark);
2566 else {
2567 /* Can be a localized value subject to deletion. */
2568 PL_tmps_stack[++PL_tmps_ix] = *mark;
b37c2d43 2569 SvREFCNT_inc_void(*mark);
cd06dffe
GS
2570 }
2571 }
2572 }
2573 }
cc8d50a7 2574 else if (cx->blk_sub.lval) { /* Leave it as it is if we can. */
cd06dffe
GS
2575 /* Here we go for robustness, not for speed, so we change all
2576 * the refcounts so the caller gets a live guy. Cannot set
2577 * TEMP, so sv_2mortal is out of question. */
a8bba7fa 2578 if (!CvLVALUE(cx->blk_sub.cv)) {
5dd42e15
DM
2579 LEAVE;
2580 cxstack_ix--;
b0d9ce38 2581 POPSUB(cx,sv);
d470f89e 2582 PL_curpm = newpm;
b0d9ce38 2583 LEAVESUB(sv);
d470f89e
GS
2584 DIE(aTHX_ "Can't modify non-lvalue subroutine call");
2585 }
cd06dffe
GS
2586 if (gimme == G_SCALAR) {
2587 MARK = newsp + 1;
2588 EXTEND_MORTAL(1);
2589 if (MARK == SP) {
f9bc45ef
TP
2590 /* Temporaries are bad unless they happen to be elements
2591 * of a tied hash or array */
2592 if (SvFLAGS(TOPs) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY) &&
2593 !(SvRMAGICAL(TOPs) && mg_find(TOPs, PERL_MAGIC_tiedelem))) {
5dd42e15
DM
2594 LEAVE;
2595 cxstack_ix--;
b0d9ce38 2596 POPSUB(cx,sv);
d470f89e 2597 PL_curpm = newpm;
b0d9ce38 2598 LEAVESUB(sv);
e9f19e3c
HS
2599 DIE(aTHX_ "Can't return %s from lvalue subroutine",
2600 SvREADONLY(TOPs) ? (TOPs == &PL_sv_undef) ? "undef"
2601 : "a readonly value" : "a temporary");
d470f89e 2602 }
cd06dffe
GS
2603 else { /* Can be a localized value
2604 * subject to deletion. */
2605 PL_tmps_stack[++PL_tmps_ix] = *mark;
b37c2d43 2606 SvREFCNT_inc_void(*mark);
cd06dffe
GS
2607 }
2608 }
d470f89e 2609 else { /* Should not happen? */
5dd42e15
DM
2610 LEAVE;
2611 cxstack_ix--;
b0d9ce38 2612 POPSUB(cx,sv);
d470f89e 2613 PL_curpm = newpm;
b0d9ce38 2614 LEAVESUB(sv);
d470f89e 2615 DIE(aTHX_ "%s returned from lvalue subroutine in scalar context",
cd06dffe 2616 (MARK > SP ? "Empty array" : "Array"));
d470f89e 2617 }
cd06dffe
GS
2618 SP = MARK;
2619 }
2620 else if (gimme == G_ARRAY) {
2621 EXTEND_MORTAL(SP - newsp);
2622 for (mark = newsp + 1; mark <= SP; mark++) {
f206cdda
AMS
2623 if (*mark != &PL_sv_undef
2624 && SvFLAGS(*mark) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
d470f89e
GS
2625 /* Might be flattened array after $#array = */
2626 PUTBACK;
5dd42e15
DM
2627 LEAVE;
2628 cxstack_ix--;
b0d9ce38 2629 POPSUB(cx,sv);
d470f89e 2630 PL_curpm = newpm;
b0d9ce38 2631 LEAVESUB(sv);
f206cdda
AMS
2632 DIE(aTHX_ "Can't return a %s from lvalue subroutine",
2633 SvREADONLY(TOPs) ? "readonly value" : "temporary");
d470f89e 2634 }
cd06dffe 2635 else {
cd06dffe
GS
2636 /* Can be a localized value subject to deletion. */
2637 PL_tmps_stack[++PL_tmps_ix] = *mark;
b37c2d43 2638 SvREFCNT_inc_void(*mark);
cd06dffe
GS
2639 }
2640 }
2641 }
2642 }
2643 else {
2644 if (gimme == G_SCALAR) {
2645 temporise:
2646 MARK = newsp + 1;
2647 if (MARK <= SP) {
a8bba7fa 2648 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
cd06dffe
GS
2649 if (SvTEMP(TOPs)) {
2650 *MARK = SvREFCNT_inc(TOPs);
2651 FREETMPS;
2652 sv_2mortal(*MARK);
2653 }
2654 else {
959e3673 2655 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
cd06dffe 2656 FREETMPS;
959e3673
GS
2657 *MARK = sv_mortalcopy(sv);
2658 SvREFCNT_dec(sv);
cd06dffe
GS
2659 }
2660 }
2661 else
2662 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
2663 }
2664 else {
2665 MEXTEND(MARK, 0);
2666 *MARK = &PL_sv_undef;
2667 }
2668 SP = MARK;
2669 }
2670 else if (gimme == G_ARRAY) {
2671 temporise_array:
2672 for (MARK = newsp + 1; MARK <= SP; MARK++) {
2673 if (!SvTEMP(*MARK)) {
2674 *MARK = sv_mortalcopy(*MARK);
2675 TAINT_NOT; /* Each item is independent */
2676 }
2677 }
2678 }
2679 }
2680 PUTBACK;
1c846c1f 2681
5dd42e15
DM
2682 LEAVE;
2683 cxstack_ix--;
b0d9ce38 2684 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
cd06dffe
GS
2685 PL_curpm = newpm; /* ... and pop $1 et al */
2686
b0d9ce38 2687 LEAVESUB(sv);
f39bc417 2688 return cx->blk_sub.retop;
cd06dffe
GS
2689}
2690
a0d0e21e
LW
2691PP(pp_entersub)
2692{
27da23d5 2693 dVAR; dSP; dPOPss;
a0d0e21e 2694 GV *gv;
a0d0e21e 2695 register CV *cv;
c09156bb 2696 register PERL_CONTEXT *cx;
5d94fbed 2697 I32 gimme;
a9c4fd4e 2698 const bool hasargs = (PL_op->op_flags & OPf_STACKED) != 0;
a0d0e21e
LW
2699
2700 if (!sv)
cea2e8a9 2701 DIE(aTHX_ "Not a CODE reference");
a0d0e21e 2702 switch (SvTYPE(sv)) {
f1025168
NC
2703 /* This is overwhelming the most common case: */
2704 case SVt_PVGV:
f730a42d
NC
2705 if (!(cv = GvCVu((GV*)sv))) {
2706 HV *stash;
f2c0649b 2707 cv = sv_2cv(sv, &stash, &gv, 0);
f730a42d 2708 }
f1025168
NC
2709 if (!cv) {
2710 ENTER;
2711 SAVETMPS;
2712 goto try_autoload;
2713 }
2714 break;
a0d0e21e
LW
2715 default:
2716 if (!SvROK(sv)) {
a9c4fd4e 2717 const char *sym;
780a5241 2718 STRLEN len;
3280af22 2719 if (sv == &PL_sv_yes) { /* unfound import, ignore */
fb73857a 2720 if (hasargs)
3280af22 2721 SP = PL_stack_base + POPMARK;
a0d0e21e 2722 RETURN;
fb73857a 2723 }
15ff848f
CS
2724 if (SvGMAGICAL(sv)) {
2725 mg_get(sv);
f5f1d18e
AMS
2726 if (SvROK(sv))
2727 goto got_rv;
780a5241
NC
2728 if (SvPOKp(sv)) {
2729 sym = SvPVX_const(sv);
2730 len = SvCUR(sv);
2731 } else {
2732 sym = NULL;
2733 len = 0;
2734 }
15ff848f 2735 }
a9c4fd4e 2736 else {
780a5241 2737 sym = SvPV_const(sv, len);
a9c4fd4e 2738 }
15ff848f 2739 if (!sym)
cea2e8a9 2740 DIE(aTHX_ PL_no_usym, "a subroutine");
533c011a 2741 if (PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 2742 DIE(aTHX_ PL_no_symref, sym, "a subroutine");
780a5241 2743 cv = get_cvn_flags(sym, len, GV_ADD|SvUTF8(sv));
a0d0e21e
LW
2744 break;
2745 }
f5f1d18e 2746 got_rv:
f5284f61 2747 {
823a54a3 2748 SV * const * sp = &sv; /* Used in tryAMAGICunDEREF macro. */
f5284f61
IZ
2749 tryAMAGICunDEREF(to_cv);
2750 }
a0d0e21e
LW
2751 cv = (CV*)SvRV(sv);
2752 if (SvTYPE(cv) == SVt_PVCV)
2753 break;
2754 /* FALL THROUGH */
2755 case SVt_PVHV:
2756 case SVt_PVAV:
cea2e8a9 2757 DIE(aTHX_ "Not a CODE reference");
f1025168 2758 /* This is the second most common case: */
a0d0e21e
LW
2759 case SVt_PVCV:
2760 cv = (CV*)sv;
2761 break;
a0d0e21e
LW
2762 }
2763
2764 ENTER;
2765 SAVETMPS;
2766
2767 retry:
a0d0e21e 2768 if (!CvROOT(cv) && !CvXSUB(cv)) {
2f349aa0
NC
2769 GV* autogv;
2770 SV* sub_name;
2771
2772 /* anonymous or undef'd function leaves us no recourse */
2773 if (CvANON(cv) || !(gv = CvGV(cv)))
2774 DIE(aTHX_ "Undefined subroutine called");
2775
2776 /* autoloaded stub? */
2777 if (cv != GvCV(gv)) {
2778 cv = GvCV(gv);
2779 }
2780 /* should call AUTOLOAD now? */
2781 else {
2782try_autoload:
2783 if ((autogv = gv_autoload4(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv),
2784 FALSE)))
2785 {
2786 cv = GvCV(autogv);
2787 }
2788 /* sorry */
2789 else {
2790 sub_name = sv_newmortal();
6136c704 2791 gv_efullname3(sub_name, gv, NULL);
be2597df 2792 DIE(aTHX_ "Undefined subroutine &%"SVf" called", SVfARG(sub_name));
2f349aa0
NC
2793 }
2794 }
2795 if (!cv)
2796 DIE(aTHX_ "Not a CODE reference");
2797 goto retry;
a0d0e21e
LW
2798 }
2799
54310121 2800 gimme = GIMME_V;
67caa1fe 2801 if ((PL_op->op_private & OPpENTERSUB_DB) && GvCV(PL_DBsub) && !CvNODEBUG(cv)) {
06492da6
SF
2802 if (CvASSERTION(cv) && PL_DBassertion)
2803 sv_setiv(PL_DBassertion, 1);
2804
005a8a35 2805 Perl_get_db_sub(aTHX_ &sv, cv);
a9ef256d
NC
2806 if (CvISXSUB(cv))
2807 PL_curcopdb = PL_curcop;
2808 cv = GvCV(PL_DBsub);
2809
ccafdc96
RGS
2810 if (!cv || (!CvXSUB(cv) && !CvSTART(cv)))
2811 DIE(aTHX_ "No DB::sub routine defined");
67caa1fe 2812 }
a0d0e21e 2813
aed2304a 2814 if (!(CvISXSUB(cv))) {
f1025168 2815 /* This path taken at least 75% of the time */
a0d0e21e
LW
2816 dMARK;
2817 register I32 items = SP - MARK;
0bcc34c2 2818 AV* const padlist = CvPADLIST(cv);
a0d0e21e
LW
2819 PUSHBLOCK(cx, CXt_SUB, MARK);
2820 PUSHSUB(cx);
f39bc417 2821 cx->blk_sub.retop = PL_op->op_next;
a0d0e21e 2822 CvDEPTH(cv)++;
6b35e009
GS
2823 /* XXX This would be a natural place to set C<PL_compcv = cv> so
2824 * that eval'' ops within this sub know the correct lexical space.
a3985cdc
DM
2825 * Owing the speed considerations, we choose instead to search for
2826 * the cv using find_runcv() when calling doeval().
6b35e009 2827 */
3a76ca88
RGS
2828 if (CvDEPTH(cv) >= 2) {
2829 PERL_STACK_OVERFLOW_CHECK();
2830 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2831 }
3a76ca88
RGS
2832 SAVECOMPPAD();
2833 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
2834 if (hasargs) {
0bcc34c2 2835 AV* const av = (AV*)PAD_SVl(0);
221373f0
GS
2836 if (AvREAL(av)) {
2837 /* @_ is normally not REAL--this should only ever
2838 * happen when DB::sub() calls things that modify @_ */
2839 av_clear(av);
2840 AvREAL_off(av);
2841 AvREIFY_on(av);
2842 }
3280af22 2843 cx->blk_sub.savearray = GvAV(PL_defgv);
b37c2d43 2844 GvAV(PL_defgv) = (AV*)SvREFCNT_inc_simple(av);
dd2155a4 2845 CX_CURPAD_SAVE(cx->blk_sub);
6d4ff0d2 2846 cx->blk_sub.argarray = av;
a0d0e21e
LW
2847 ++MARK;
2848
2849 if (items > AvMAX(av) + 1) {
504618e9 2850 SV **ary = AvALLOC(av);
a0d0e21e
LW
2851 if (AvARRAY(av) != ary) {
2852 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
9c6bc640 2853 AvARRAY(av) = ary;
a0d0e21e
LW
2854 }
2855 if (items > AvMAX(av) + 1) {
2856 AvMAX(av) = items - 1;
2857 Renew(ary,items,SV*);
2858 AvALLOC(av) = ary;
9c6bc640 2859 AvARRAY(av) = ary;
a0d0e21e
LW
2860 }
2861 }
2862 Copy(MARK,AvARRAY(av),items,SV*);
93965878 2863 AvFILLp(av) = items - 1;
1c846c1f 2864
a0d0e21e
LW
2865 while (items--) {
2866 if (*MARK)
2867 SvTEMP_off(*MARK);
2868 MARK++;
2869 }
2870 }
4a925ff6
GS
2871 /* warning must come *after* we fully set up the context
2872 * stuff so that __WARN__ handlers can safely dounwind()
2873 * if they want to
2874 */
2875 if (CvDEPTH(cv) == 100 && ckWARN(WARN_RECURSION)
2876 && !(PERLDB_SUB && cv == GvCV(PL_DBsub)))
2877 sub_crush_depth(cv);
77a005ab 2878#if 0
bf49b057 2879 DEBUG_S(PerlIO_printf(Perl_debug_log,
6c9570dc 2880 "%p entersub returning %p\n", (void*)thr, (void*)CvSTART(cv)));
77a005ab 2881#endif
a0d0e21e
LW
2882 RETURNOP(CvSTART(cv));
2883 }
f1025168 2884 else {
3a76ca88 2885 I32 markix = TOPMARK;
f1025168 2886
3a76ca88 2887 PUTBACK;
f1025168 2888
3a76ca88
RGS
2889 if (!hasargs) {
2890 /* Need to copy @_ to stack. Alternative may be to
2891 * switch stack to @_, and copy return values
2892 * back. This would allow popping @_ in XSUB, e.g.. XXXX */
2893 AV * const av = GvAV(PL_defgv);
2894 const I32 items = AvFILLp(av) + 1; /* @_ is not tieable */
2895
2896 if (items) {
2897 /* Mark is at the end of the stack. */
2898 EXTEND(SP, items);
2899 Copy(AvARRAY(av), SP + 1, items, SV*);
2900 SP += items;
2901 PUTBACK ;
2902 }
2903 }
2904 /* We assume first XSUB in &DB::sub is the called one. */
2905 if (PL_curcopdb) {
2906 SAVEVPTR(PL_curcop);
2907 PL_curcop = PL_curcopdb;
2908 PL_curcopdb = NULL;
2909 }
2910 /* Do we need to open block here? XXXX */
2911 if (CvXSUB(cv)) /* XXX this is supposed to be true */
2912 (void)(*CvXSUB(cv))(aTHX_ cv);
2913
2914 /* Enforce some sanity in scalar context. */
2915 if (gimme == G_SCALAR && ++markix != PL_stack_sp - PL_stack_base ) {
2916 if (markix > PL_stack_sp - PL_stack_base)
2917 *(PL_stack_base + markix) = &PL_sv_undef;
2918 else
2919 *(PL_stack_base + markix) = *PL_stack_sp;
2920 PL_stack_sp = PL_stack_base + markix;
2921 }
f1025168
NC
2922 LEAVE;
2923 return NORMAL;
2924 }
a0d0e21e
LW
2925}
2926
44a8e56a 2927void
864dbfa3 2928Perl_sub_crush_depth(pTHX_ CV *cv)
44a8e56a
PP
2929{
2930 if (CvANON(cv))
9014280d 2931 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on anonymous subroutine");
44a8e56a 2932 else {
aec46f14 2933 SV* const tmpstr = sv_newmortal();
6136c704 2934 gv_efullname3(tmpstr, CvGV(cv), NULL);
35c1215d 2935 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on subroutine \"%"SVf"\"",
be2597df 2936 SVfARG(tmpstr));
44a8e56a
PP
2937 }
2938}
2939
a0d0e21e
LW
2940PP(pp_aelem)
2941{
97aff369 2942 dVAR; dSP;
a0d0e21e 2943 SV** svp;
a3b680e6 2944 SV* const elemsv = POPs;
d804643f 2945 IV elem = SvIV(elemsv);
0bcc34c2 2946 AV* const av = (AV*)POPs;
e1ec3a88
AL
2947 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
2948 const U32 defer = (PL_op->op_private & OPpLVAL_DEFER) && (elem > av_len(av));
be6c24e0 2949 SV *sv;
a0d0e21e 2950
e35c1634 2951 if (SvROK(elemsv) && !SvGAMAGIC(elemsv) && ckWARN(WARN_MISC))
95b63a38
JH
2952 Perl_warner(aTHX_ packWARN(WARN_MISC),
2953 "Use of reference \"%"SVf"\" as array index",
be2597df 2954 SVfARG(elemsv));
748a9306 2955 if (elem > 0)
fc15ae8f 2956 elem -= CopARYBASE_get(PL_curcop);
a0d0e21e
LW
2957 if (SvTYPE(av) != SVt_PVAV)
2958 RETPUSHUNDEF;
68dc0745 2959 svp = av_fetch(av, elem, lval && !defer);
a0d0e21e 2960 if (lval) {
2b573ace 2961#ifdef PERL_MALLOC_WRAP
2b573ace 2962 if (SvUOK(elemsv)) {
a9c4fd4e 2963 const UV uv = SvUV(elemsv);
2b573ace
JH
2964 elem = uv > IV_MAX ? IV_MAX : uv;
2965 }
2966 else if (SvNOK(elemsv))
2967 elem = (IV)SvNV(elemsv);
a3b680e6
AL
2968 if (elem > 0) {
2969 static const char oom_array_extend[] =
2970 "Out of memory during array extend"; /* Duplicated in av.c */
2b573ace 2971 MEM_WRAP_CHECK_1(elem,SV*,oom_array_extend);
a3b680e6 2972 }
2b573ace 2973#endif
3280af22 2974 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
2975 SV* lv;
2976 if (!defer)
cea2e8a9 2977 DIE(aTHX_ PL_no_aelem, elem);
68dc0745
PP
2978 lv = sv_newmortal();
2979 sv_upgrade(lv, SVt_PVLV);
2980 LvTYPE(lv) = 'y';
a0714e2c 2981 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
b37c2d43 2982 LvTARG(lv) = SvREFCNT_inc_simple(av);
68dc0745
PP
2983 LvTARGOFF(lv) = elem;
2984 LvTARGLEN(lv) = 1;
2985 PUSHs(lv);
2986 RETURN;
2987 }
bfc4de9f 2988 if (PL_op->op_private & OPpLVAL_INTRO)
161b7d16 2989 save_aelem(av, elem, svp);
533c011a
NIS
2990 else if (PL_op->op_private & OPpDEREF)
2991 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 2992 }
3280af22 2993 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
2994 if (!lval && SvGMAGICAL(sv)) /* see note in pp_helem() */
2995 sv = sv_mortalcopy(sv);
2996 PUSHs(sv);
a0d0e21e
LW
2997 RETURN;
2998}
2999
02a9e968 3000void
864dbfa3 3001Perl_vivify_ref(pTHX_ SV *sv, U32 to_what)
02a9e968 3002{
5b295bef 3003 SvGETMAGIC(sv);
02a9e968
CS
3004 if (!SvOK(sv)) {
3005 if (SvREADONLY(sv))
cea2e8a9 3006 Perl_croak(aTHX_ PL_no_modify);
5f05dabc
PP
3007 if (SvTYPE(sv) < SVt_RV)
3008 sv_upgrade(sv, SVt_RV);
3009 else if (SvTYPE(sv) >= SVt_PV) {
8bd4d4c5 3010 SvPV_free(sv);
b162af07
SP
3011 SvLEN_set(sv, 0);
3012 SvCUR_set(sv, 0);
5f05dabc 3013 }
68dc0745 3014 switch (to_what) {
5f05dabc 3015 case OPpDEREF_SV:
561b68a9 3016 SvRV_set(sv, newSV(0));
5f05dabc
PP
3017 break;
3018 case OPpDEREF_AV:
b162af07 3019 SvRV_set(sv, (SV*)newAV());
5f05dabc
PP
3020 break;
3021 case OPpDEREF_HV:
b162af07 3022 SvRV_set(sv, (SV*)newHV());
5f05dabc
PP
3023 break;
3024 }
02a9e968
CS
3025 SvROK_on(sv);
3026 SvSETMAGIC(sv);
3027 }
3028}
3029
a0d0e21e
LW
3030PP(pp_method)
3031{
97aff369 3032 dVAR; dSP;
890ce7af 3033 SV* const sv = TOPs;
f5d5a27c
CS
3034
3035 if (SvROK(sv)) {
890ce7af 3036 SV* const rsv = SvRV(sv);
f5d5a27c
CS
3037 if (SvTYPE(rsv) == SVt_PVCV) {
3038 SETs(rsv);
3039 RETURN;
3040 }
3041 }
3042
4608196e 3043 SETs(method_common(sv, NULL));
f5d5a27c
CS
3044 RETURN;
3045}
3046
3047PP(pp_method_named)
3048{
97aff369 3049 dVAR; dSP;
890ce7af 3050 SV* const sv = cSVOP_sv;
c158a4fd 3051 U32 hash = SvSHARED_HASH(sv);
f5d5a27c
CS
3052
3053 XPUSHs(method_common(sv, &hash));
3054 RETURN;
3055}
3056
3057STATIC SV *
3058S_method_common(pTHX_ SV* meth, U32* hashp)
3059{
97aff369 3060 dVAR;
a0d0e21e
LW
3061 SV* ob;
3062 GV* gv;
56304f61 3063 HV* stash;
f5d5a27c 3064 STRLEN namelen;
6136c704 3065 const char* packname = NULL;
a0714e2c 3066 SV *packsv = NULL;
ac91690f 3067 STRLEN packlen;
46c461b5
AL
3068 const char * const name = SvPV_const(meth, namelen);
3069 SV * const sv = *(PL_stack_base + TOPMARK + 1);
f5d5a27c 3070
4f1b7578
SC
3071 if (!sv)
3072 Perl_croak(aTHX_ "Can't call method \"%s\" on an undefined value", name);
3073
5b295bef 3074 SvGETMAGIC(sv);
a0d0e21e 3075 if (SvROK(sv))
16d20bd9 3076 ob = (SV*)SvRV(sv);
a0d0e21e
LW
3077 else {
3078 GV* iogv;
a0d0e21e 3079
af09ea45 3080 /* this isn't a reference */
5c144d81 3081 if(SvOK(sv) && (packname = SvPV_const(sv, packlen))) {
b464bac0 3082 const HE* const he = hv_fetch_ent(PL_stashcache, sv, 0, 0);
081fc587 3083 if (he) {
5e6396ae 3084 stash = INT2PTR(HV*,SvIV(HeVAL(he)));
081fc587
AB
3085 goto fetch;
3086 }
3087 }
3088
a0d0e21e 3089 if (!SvOK(sv) ||
05f5af9a 3090 !(packname) ||
f776e3cd 3091 !(iogv = gv_fetchsv(sv, 0, SVt_PVIO)) ||
a0d0e21e
LW
3092 !(ob=(SV*)GvIO(iogv)))
3093 {
af09ea45 3094 /* this isn't the name of a filehandle either */
1c846c1f 3095 if (!packname ||
fd400ab9 3096 ((UTF8_IS_START(*packname) && DO_UTF8(sv))
b86a2fa7 3097 ? !isIDFIRST_utf8((U8*)packname)
834a4ddd
LW
3098 : !isIDFIRST(*packname)
3099 ))
3100 {
f5d5a27c
CS
3101 Perl_croak(aTHX_ "Can't call method \"%s\" %s", name,
3102 SvOK(sv) ? "without a package or object reference"
3103 : "on an undefined value");
834a4ddd 3104 }
af09ea45
IK
3105 /* assume it's a package name */
3106 stash = gv_stashpvn(packname, packlen, FALSE);
0dae17bd
GS
3107 if (!stash)
3108 packsv = sv;
081fc587 3109 else {
d4c19fe8 3110 SV* const ref = newSViv(PTR2IV(stash));
7e8961ec
AB
3111 hv_store(PL_stashcache, packname, packlen, ref, 0);
3112 }
ac91690f 3113 goto fetch;
a0d0e21e 3114 }
af09ea45 3115 /* it _is_ a filehandle name -- replace with a reference */
3280af22 3116 *(PL_stack_base + TOPMARK + 1) = sv_2mortal(newRV((SV*)iogv));
a0d0e21e
LW
3117 }
3118
af09ea45 3119 /* if we got here, ob should be a reference or a glob */
f0d43078
GS
3120 if (!ob || !(SvOBJECT(ob)
3121 || (SvTYPE(ob) == SVt_PVGV && (ob = (SV*)GvIO((GV*)ob))
3122 && SvOBJECT(ob))))
3123 {
f5d5a27c
CS
3124 Perl_croak(aTHX_ "Can't call method \"%s\" on unblessed reference",
3125 name);
f0d43078 3126 }
a0d0e21e 3127
56304f61 3128 stash = SvSTASH(ob);
a0d0e21e 3129
ac91690f 3130 fetch:
af09ea45
IK
3131 /* NOTE: stash may be null, hope hv_fetch_ent and
3132 gv_fetchmethod can cope (it seems they can) */
3133
f5d5a27c
CS
3134 /* shortcut for simple names */
3135 if (hashp) {
b464bac0 3136 const HE* const he = hv_fetch_ent(stash, meth, 0, *hashp);
f5d5a27c
CS
3137 if (he) {
3138 gv = (GV*)HeVAL(he);
3139 if (isGV(gv) && GvCV(gv) &&
3140 (!GvCVGEN(gv) || GvCVGEN(gv) == PL_sub_generation))
3141 return (SV*)GvCV(gv);
3142 }
3143 }
3144
0dae17bd 3145 gv = gv_fetchmethod(stash ? stash : (HV*)packsv, name);
af09ea45 3146
56304f61 3147 if (!gv) {
af09ea45
IK
3148 /* This code tries to figure out just what went wrong with
3149 gv_fetchmethod. It therefore needs to duplicate a lot of
3150 the internals of that function. We can't move it inside
3151 Perl_gv_fetchmethod_autoload(), however, since that would
3152 cause UNIVERSAL->can("NoSuchPackage::foo") to croak, and we
3153 don't want that.
3154 */
a9c4fd4e 3155 const char* leaf = name;
6136c704 3156 const char* sep = NULL;
a9c4fd4e 3157 const char* p;
56304f61
CS
3158
3159 for (p = name; *p; p++) {
3160 if (*p == '\'')
3161 sep = p, leaf = p + 1;
3162 else if (*p == ':' && *(p + 1) == ':')
3163 sep = p, leaf = p + 2;
3164 }
3165 if (!sep || ((sep - name) == 5 && strnEQ(name, "SUPER", 5))) {
9b9d0b15
NC
3166 /* the method name is unqualified or starts with SUPER:: */
3167 bool need_strlen = 1;
3168 if (sep) {
3169 packname = CopSTASHPV(PL_curcop);
3170 }
3171 else if (stash) {
46c461b5 3172 HEK * const packhek = HvNAME_HEK(stash);
9b9d0b15
NC
3173 if (packhek) {
3174 packname = HEK_KEY(packhek);
3175 packlen = HEK_LEN(packhek);
3176 need_strlen = 0;
3177 } else {
3178 goto croak;
3179 }
3180 }
3181
3182 if (!packname) {
3183 croak:
e27ad1f2
AV
3184 Perl_croak(aTHX_
3185 "Can't use anonymous symbol table for method lookup");
9b9d0b15
NC
3186 }
3187 else if (need_strlen)
e27ad1f2 3188 packlen = strlen(packname);
9b9d0b15 3189
56304f61
CS
3190 }
3191 else {
af09ea45 3192 /* the method name is qualified */
56304f61
CS
3193 packname = name;
3194 packlen = sep - name;
3195 }
af09ea45
IK
3196
3197 /* we're relying on gv_fetchmethod not autovivifying the stash */
3198 if (gv_stashpvn(packname, packlen, FALSE)) {
c1899e02 3199 Perl_croak(aTHX_
af09ea45
IK
3200 "Can't locate object method \"%s\" via package \"%.*s\"",
3201 leaf, (int)packlen, packname);
c1899e02
GS
3202 }
3203 else {
3204 Perl_croak(aTHX_
af09ea45
IK
3205 "Can't locate object method \"%s\" via package \"%.*s\""
3206 " (perhaps you forgot to load \"%.*s\"?)",
3207 leaf, (int)packlen, packname, (int)packlen, packname);
c1899e02 3208 }
56304f61 3209 }
f5d5a27c 3210 return isGV(gv) ? (SV*)GvCV(gv) : (SV*)gv;
a0d0e21e 3211}
241d1a3b
NC
3212
3213/*
3214 * Local variables:
3215 * c-indentation-style: bsd
3216 * c-basic-offset: 4
3217 * indent-tabs-mode: t
3218 * End:
3219 *
37442d52
RGS
3220 * ex: set ts=8 sts=4 sw=4 noet:
3221 */