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Separate handling of ${^PREMATCH} from $` etc
[perl5.git] / pp_hot.c
CommitLineData
a0d0e21e
LW
1/* pp_hot.c
2 *
1129b882
NC
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 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 *
4ac71550
TC
15 * Awake! Awake! Fear, Fire, Foes! Awake!
16 * Fire, Foes! Awake!
17 *
18 * [p.1007 of _The Lord of the Rings_, VI/viii: "The Scouring of the Shire"]
a0d0e21e
LW
19 */
20
166f8a29
DM
21/* This file contains 'hot' pp ("push/pop") functions that
22 * execute the opcodes that make up a perl program. A typical pp function
23 * expects to find its arguments on the stack, and usually pushes its
24 * results onto the stack, hence the 'pp' terminology. Each OP structure
25 * contains a pointer to the relevant pp_foo() function.
26 *
27 * By 'hot', we mean common ops whose execution speed is critical.
28 * By gathering them together into a single file, we encourage
29 * CPU cache hits on hot code. Also it could be taken as a warning not to
30 * change any code in this file unless you're sure it won't affect
31 * performance.
32 */
33
a0d0e21e 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_PP_HOT_C
a0d0e21e
LW
36#include "perl.h"
37
38/* Hot code. */
39
40PP(pp_const)
41{
97aff369 42 dVAR;
39644a26 43 dSP;
996c9baa 44 XPUSHs(cSVOP_sv);
a0d0e21e
LW
45 RETURN;
46}
47
48PP(pp_nextstate)
49{
97aff369 50 dVAR;
533c011a 51 PL_curcop = (COP*)PL_op;
a0d0e21e 52 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 53 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e 54 FREETMPS;
f410a211 55 PERL_ASYNC_CHECK();
a0d0e21e
LW
56 return NORMAL;
57}
58
59PP(pp_gvsv)
60{
97aff369 61 dVAR;
39644a26 62 dSP;
924508f0 63 EXTEND(SP,1);
533c011a 64 if (PL_op->op_private & OPpLVAL_INTRO)
1d7c1841 65 PUSHs(save_scalar(cGVOP_gv));
a0d0e21e 66 else
c69033f2 67 PUSHs(GvSVn(cGVOP_gv));
a0d0e21e
LW
68 RETURN;
69}
70
71PP(pp_null)
72{
97aff369 73 dVAR;
a0d0e21e
LW
74 return NORMAL;
75}
76
5d8673bc 77/* This is sometimes called directly by pp_coreargs and pp_grepstart. */
a0d0e21e
LW
78PP(pp_pushmark)
79{
97aff369 80 dVAR;
3280af22 81 PUSHMARK(PL_stack_sp);
a0d0e21e
LW
82 return NORMAL;
83}
84
85PP(pp_stringify)
86{
97aff369 87 dVAR; dSP; dTARGET;
6050d10e 88 sv_copypv(TARG,TOPs);
a0d0e21e
LW
89 SETTARG;
90 RETURN;
91}
92
93PP(pp_gv)
94{
97aff369 95 dVAR; dSP;
ad64d0ec 96 XPUSHs(MUTABLE_SV(cGVOP_gv));
a0d0e21e
LW
97 RETURN;
98}
99
100PP(pp_and)
101{
97aff369 102 dVAR; dSP;
f410a211 103 PERL_ASYNC_CHECK();
a0d0e21e
LW
104 if (!SvTRUE(TOPs))
105 RETURN;
106 else {
c960fc3b
SP
107 if (PL_op->op_type == OP_AND)
108 --SP;
a0d0e21e
LW
109 RETURNOP(cLOGOP->op_other);
110 }
111}
112
113PP(pp_sassign)
114{
3e75a3c4
RU
115 dVAR; dSP;
116 /* sassign keeps its args in the optree traditionally backwards.
117 So we pop them differently.
118 */
119 SV *left = POPs; SV *right = TOPs;
748a9306 120
533c011a 121 if (PL_op->op_private & OPpASSIGN_BACKWARDS) {
0bd48802
AL
122 SV * const temp = left;
123 left = right; right = temp;
a0d0e21e 124 }
3e75a3c4 125 if (PL_tainting && PL_tainted && !SvTAINTED(right))
a0d0e21e 126 TAINT_NOT;
e26df76a 127 if (PL_op->op_private & OPpASSIGN_CV_TO_GV) {
3e75a3c4 128 SV * const cv = SvRV(right);
e26df76a 129 const U32 cv_type = SvTYPE(cv);
3e75a3c4 130 const bool is_gv = isGV_with_GP(left);
6136c704 131 const bool got_coderef = cv_type == SVt_PVCV || cv_type == SVt_PVFM;
e26df76a
NC
132
133 if (!got_coderef) {
134 assert(SvROK(cv));
135 }
136
3e75a3c4
RU
137 /* Can do the optimisation if left (LVALUE) is not a typeglob,
138 right (RVALUE) is a reference to something, and we're in void
e26df76a 139 context. */
13be902c 140 if (!got_coderef && !is_gv && GIMME_V == G_VOID) {
e26df76a 141 /* Is the target symbol table currently empty? */
3e75a3c4 142 GV * const gv = gv_fetchsv_nomg(left, GV_NOINIT, SVt_PVGV);
bb112e5a 143 if (SvTYPE(gv) != SVt_PVGV && !SvOK(gv)) {
e26df76a
NC
144 /* Good. Create a new proxy constant subroutine in the target.
145 The gv becomes a(nother) reference to the constant. */
146 SV *const value = SvRV(cv);
147
ad64d0ec 148 SvUPGRADE(MUTABLE_SV(gv), SVt_IV);
1ccdb730 149 SvPCS_IMPORTED_on(gv);
e26df76a 150 SvRV_set(gv, value);
b37c2d43 151 SvREFCNT_inc_simple_void(value);
3e75a3c4 152 SETs(left);
e26df76a
NC
153 RETURN;
154 }
155 }
156
157 /* Need to fix things up. */
13be902c 158 if (!is_gv) {
e26df76a 159 /* Need to fix GV. */
3e75a3c4 160 left = MUTABLE_SV(gv_fetchsv_nomg(left,GV_ADD, SVt_PVGV));
e26df76a
NC
161 }
162
163 if (!got_coderef) {
164 /* We've been returned a constant rather than a full subroutine,
165 but they expect a subroutine reference to apply. */
53a42478 166 if (SvROK(cv)) {
d343c3ef 167 ENTER_with_name("sassign_coderef");
53a42478
NC
168 SvREFCNT_inc_void(SvRV(cv));
169 /* newCONSTSUB takes a reference count on the passed in SV
170 from us. We set the name to NULL, otherwise we get into
171 all sorts of fun as the reference to our new sub is
172 donated to the GV that we're about to assign to.
173 */
3e75a3c4 174 SvRV_set(right, MUTABLE_SV(newCONSTSUB(GvSTASH(left), NULL,
ad64d0ec 175 SvRV(cv))));
53a42478 176 SvREFCNT_dec(cv);
d343c3ef 177 LEAVE_with_name("sassign_coderef");
53a42478
NC
178 } else {
179 /* What can happen for the corner case *{"BONK"} = \&{"BONK"};
180 is that
181 First: ops for \&{"BONK"}; return us the constant in the
182 symbol table
183 Second: ops for *{"BONK"} cause that symbol table entry
184 (and our reference to it) to be upgraded from RV
185 to typeblob)
186 Thirdly: We get here. cv is actually PVGV now, and its
187 GvCV() is actually the subroutine we're looking for
188
189 So change the reference so that it points to the subroutine
190 of that typeglob, as that's what they were after all along.
191 */
159b6efe 192 GV *const upgraded = MUTABLE_GV(cv);
53a42478
NC
193 CV *const source = GvCV(upgraded);
194
195 assert(source);
196 assert(CvFLAGS(source) & CVf_CONST);
197
198 SvREFCNT_inc_void(source);
199 SvREFCNT_dec(upgraded);
3e75a3c4 200 SvRV_set(right, MUTABLE_SV(source));
53a42478 201 }
e26df76a 202 }
53a42478 203
e26df76a 204 }
8fe85e3f 205 if (
3e75a3c4
RU
206 SvTEMP(left) && !SvSMAGICAL(left) && SvREFCNT(left) == 1 &&
207 (!isGV_with_GP(left) || SvFAKE(left)) && ckWARN(WARN_MISC)
8fe85e3f
FC
208 )
209 Perl_warner(aTHX_
210 packWARN(WARN_MISC), "Useless assignment to a temporary"
211 );
3e75a3c4
RU
212 SvSetMagicSV(left, right);
213 SETs(left);
a0d0e21e
LW
214 RETURN;
215}
216
217PP(pp_cond_expr)
218{
97aff369 219 dVAR; dSP;
f410a211 220 PERL_ASYNC_CHECK();
a0d0e21e 221 if (SvTRUEx(POPs))
1a67a97c 222 RETURNOP(cLOGOP->op_other);
a0d0e21e 223 else
1a67a97c 224 RETURNOP(cLOGOP->op_next);
a0d0e21e
LW
225}
226
227PP(pp_unstack)
228{
97aff369 229 dVAR;
8f3964af 230 PERL_ASYNC_CHECK();
a0d0e21e 231 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 232 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e 233 FREETMPS;
eae48c89
Z
234 if (!(PL_op->op_flags & OPf_SPECIAL)) {
235 I32 oldsave = PL_scopestack[PL_scopestack_ix - 1];
236 LEAVE_SCOPE(oldsave);
237 }
a0d0e21e
LW
238 return NORMAL;
239}
240
a0d0e21e
LW
241PP(pp_concat)
242{
6f1401dc 243 dVAR; dSP; dATARGET; tryAMAGICbin_MG(concat_amg, AMGf_assign);
748a9306
LW
244 {
245 dPOPTOPssrl;
8d6d96c1
HS
246 bool lbyte;
247 STRLEN rlen;
d4c19fe8 248 const char *rpv = NULL;
a6b599c7 249 bool rbyte = FALSE;
a9c4fd4e 250 bool rcopied = FALSE;
8d6d96c1 251
6f1401dc
DM
252 if (TARG == right && right != left) { /* $r = $l.$r */
253 rpv = SvPV_nomg_const(right, rlen);
c75ab21a 254 rbyte = !DO_UTF8(right);
59cd0e26 255 right = newSVpvn_flags(rpv, rlen, SVs_TEMP);
349d4f2f 256 rpv = SvPV_const(right, rlen); /* no point setting UTF-8 here */
db79b45b 257 rcopied = TRUE;
8d6d96c1 258 }
7889fe52 259
89734059 260 if (TARG != left) { /* not $l .= $r */
a9c4fd4e 261 STRLEN llen;
6f1401dc 262 const char* const lpv = SvPV_nomg_const(left, llen);
90f5826e 263 lbyte = !DO_UTF8(left);
8d6d96c1
HS
264 sv_setpvn(TARG, lpv, llen);
265 if (!lbyte)
266 SvUTF8_on(TARG);
267 else
268 SvUTF8_off(TARG);
269 }
89734059 270 else { /* $l .= $r */
c75ab21a 271 if (!SvOK(TARG)) {
89734059 272 if (left == right && ckWARN(WARN_UNINITIALIZED)) /* $l .= $l */
c75ab21a 273 report_uninit(right);
76f68e9b 274 sv_setpvs(left, "");
c75ab21a 275 }
c5aa2872
DM
276 lbyte = (SvROK(left) && SvTYPE(SvRV(left)) == SVt_REGEXP)
277 ? !DO_UTF8(SvRV(left)) : !DO_UTF8(left);
90f5826e
ST
278 if (IN_BYTES)
279 SvUTF8_off(TARG);
8d6d96c1 280 }
a12c0f56 281
c75ab21a 282 if (!rcopied) {
6f1401dc 283 if (left == right)
89734059 284 /* $r.$r: do magic twice: tied might return different 2nd time */
6f1401dc
DM
285 SvGETMAGIC(right);
286 rpv = SvPV_nomg_const(right, rlen);
c75ab21a
RH
287 rbyte = !DO_UTF8(right);
288 }
8d6d96c1 289 if (lbyte != rbyte) {
e3393f51
NT
290 /* sv_utf8_upgrade_nomg() may reallocate the stack */
291 PUTBACK;
8d6d96c1
HS
292 if (lbyte)
293 sv_utf8_upgrade_nomg(TARG);
294 else {
db79b45b 295 if (!rcopied)
59cd0e26 296 right = newSVpvn_flags(rpv, rlen, SVs_TEMP);
8d6d96c1 297 sv_utf8_upgrade_nomg(right);
6f1401dc 298 rpv = SvPV_nomg_const(right, rlen);
69b47968 299 }
e3393f51 300 SPAGAIN;
a0d0e21e 301 }
8d6d96c1 302 sv_catpvn_nomg(TARG, rpv, rlen);
43ebc500 303
a0d0e21e
LW
304 SETTARG;
305 RETURN;
748a9306 306 }
a0d0e21e
LW
307}
308
309PP(pp_padsv)
310{
97aff369 311 dVAR; dSP; dTARGET;
a0d0e21e 312 XPUSHs(TARG);
533c011a
NIS
313 if (PL_op->op_flags & OPf_MOD) {
314 if (PL_op->op_private & OPpLVAL_INTRO)
952306ac
RGS
315 if (!(PL_op->op_private & OPpPAD_STATE))
316 SAVECLEARSV(PAD_SVl(PL_op->op_targ));
a62b51b8 317 if (PL_op->op_private & OPpDEREF) {
8ec5e241 318 PUTBACK;
9026059d 319 TOPs = vivify_ref(TOPs, PL_op->op_private & OPpDEREF);
8ec5e241
NIS
320 SPAGAIN;
321 }
4633a7c4 322 }
a0d0e21e
LW
323 RETURN;
324}
325
326PP(pp_readline)
327{
97aff369 328 dVAR;
30901a8a
FC
329 dSP;
330 if (TOPs) {
331 SvGETMAGIC(TOPs);
67288365 332 tryAMAGICunTARGETlist(iter_amg, 0, 0);
30901a8a
FC
333 PL_last_in_gv = MUTABLE_GV(*PL_stack_sp--);
334 }
335 else PL_last_in_gv = PL_argvgv, PL_stack_sp--;
6e592b3a
BM
336 if (!isGV_with_GP(PL_last_in_gv)) {
337 if (SvROK(PL_last_in_gv) && isGV_with_GP(SvRV(PL_last_in_gv)))
159b6efe 338 PL_last_in_gv = MUTABLE_GV(SvRV(PL_last_in_gv));
8efb3254 339 else {
f5284f61 340 dSP;
ad64d0ec 341 XPUSHs(MUTABLE_SV(PL_last_in_gv));
f5284f61 342 PUTBACK;
897d3989 343 Perl_pp_rv2gv(aTHX);
159b6efe 344 PL_last_in_gv = MUTABLE_GV(*PL_stack_sp--);
f5284f61
IZ
345 }
346 }
a0d0e21e
LW
347 return do_readline();
348}
349
350PP(pp_eq)
351{
6f1401dc 352 dVAR; dSP;
33efebe6
DM
353 SV *left, *right;
354
a42d0242 355 tryAMAGICbin_MG(eq_amg, AMGf_set|AMGf_numeric);
33efebe6
DM
356 right = POPs;
357 left = TOPs;
358 SETs(boolSV(
359 (SvIOK_notUV(left) && SvIOK_notUV(right))
360 ? (SvIVX(left) == SvIVX(right))
361 : ( do_ncmp(left, right) == 0)
362 ));
363 RETURN;
a0d0e21e
LW
364}
365
366PP(pp_preinc)
367{
97aff369 368 dVAR; dSP;
17058fe0
FC
369 const bool inc =
370 PL_op->op_type == OP_PREINC || PL_op->op_type == OP_I_PREINC;
60092ce4 371 if (SvTYPE(TOPs) >= SVt_PVAV || (isGV_with_GP(TOPs) && !SvFAKE(TOPs)))
6ad8f254 372 Perl_croak_no_modify(aTHX);
4bac9ae4 373 if (!SvREADONLY(TOPs) && !SvGMAGICAL(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
17058fe0 374 && SvIVX(TOPs) != (inc ? IV_MAX : IV_MIN))
55497cff 375 {
17058fe0 376 SvIV_set(TOPs, SvIVX(TOPs) + (inc ? 1 : -1));
55497cff 377 SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
748a9306 378 }
28e5dec8 379 else /* Do all the PERL_PRESERVE_IVUV conditionals in sv_inc */
17058fe0
FC
380 if (inc) sv_inc(TOPs);
381 else sv_dec(TOPs);
a0d0e21e
LW
382 SvSETMAGIC(TOPs);
383 return NORMAL;
384}
385
386PP(pp_or)
387{
97aff369 388 dVAR; dSP;
f410a211 389 PERL_ASYNC_CHECK();
a0d0e21e
LW
390 if (SvTRUE(TOPs))
391 RETURN;
392 else {
c960fc3b
SP
393 if (PL_op->op_type == OP_OR)
394 --SP;
a0d0e21e
LW
395 RETURNOP(cLOGOP->op_other);
396 }
397}
398
25a55bd7 399PP(pp_defined)
c963b151 400{
97aff369 401 dVAR; dSP;
eb578fdb 402 SV* sv;
6136c704 403 bool defined;
25a55bd7 404 const int op_type = PL_op->op_type;
ea5195b7 405 const bool is_dor = (op_type == OP_DOR || op_type == OP_DORASSIGN);
c963b151 406
6136c704 407 if (is_dor) {
f410a211 408 PERL_ASYNC_CHECK();
25a55bd7
SP
409 sv = TOPs;
410 if (!sv || !SvANY(sv)) {
2bd49cfc
NC
411 if (op_type == OP_DOR)
412 --SP;
25a55bd7
SP
413 RETURNOP(cLOGOP->op_other);
414 }
b7c44293
RGS
415 }
416 else {
417 /* OP_DEFINED */
25a55bd7
SP
418 sv = POPs;
419 if (!sv || !SvANY(sv))
420 RETPUSHNO;
b7c44293 421 }
25a55bd7 422
6136c704 423 defined = FALSE;
c963b151
BD
424 switch (SvTYPE(sv)) {
425 case SVt_PVAV:
426 if (AvMAX(sv) >= 0 || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 427 defined = TRUE;
c963b151
BD
428 break;
429 case SVt_PVHV:
430 if (HvARRAY(sv) || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 431 defined = TRUE;
c963b151
BD
432 break;
433 case SVt_PVCV:
434 if (CvROOT(sv) || CvXSUB(sv))
25a55bd7 435 defined = TRUE;
c963b151
BD
436 break;
437 default:
5b295bef 438 SvGETMAGIC(sv);
c963b151 439 if (SvOK(sv))
25a55bd7 440 defined = TRUE;
6136c704 441 break;
c963b151 442 }
6136c704
AL
443
444 if (is_dor) {
c960fc3b
SP
445 if(defined)
446 RETURN;
447 if(op_type == OP_DOR)
448 --SP;
25a55bd7 449 RETURNOP(cLOGOP->op_other);
25a55bd7 450 }
d9aa96a4
SP
451 /* assuming OP_DEFINED */
452 if(defined)
453 RETPUSHYES;
454 RETPUSHNO;
c963b151
BD
455}
456
a0d0e21e
LW
457PP(pp_add)
458{
800401ee 459 dVAR; dSP; dATARGET; bool useleft; SV *svl, *svr;
6f1401dc
DM
460 tryAMAGICbin_MG(add_amg, AMGf_assign|AMGf_numeric);
461 svr = TOPs;
462 svl = TOPm1s;
463
800401ee 464 useleft = USE_LEFT(svl);
28e5dec8
JH
465#ifdef PERL_PRESERVE_IVUV
466 /* We must see if we can perform the addition with integers if possible,
467 as the integer code detects overflow while the NV code doesn't.
468 If either argument hasn't had a numeric conversion yet attempt to get
469 the IV. It's important to do this now, rather than just assuming that
470 it's not IOK as a PV of "9223372036854775806" may not take well to NV
471 addition, and an SV which is NOK, NV=6.0 ought to be coerced to
472 integer in case the second argument is IV=9223372036854775806
473 We can (now) rely on sv_2iv to do the right thing, only setting the
474 public IOK flag if the value in the NV (or PV) slot is truly integer.
475
476 A side effect is that this also aggressively prefers integer maths over
7dca457a
NC
477 fp maths for integer values.
478
a00b5bd3 479 How to detect overflow?
7dca457a
NC
480
481 C 99 section 6.2.6.1 says
482
483 The range of nonnegative values of a signed integer type is a subrange
484 of the corresponding unsigned integer type, and the representation of
485 the same value in each type is the same. A computation involving
486 unsigned operands can never overflow, because a result that cannot be
487 represented by the resulting unsigned integer type is reduced modulo
488 the number that is one greater than the largest value that can be
489 represented by the resulting type.
490
491 (the 9th paragraph)
492
493 which I read as "unsigned ints wrap."
494
495 signed integer overflow seems to be classed as "exception condition"
496
497 If an exceptional condition occurs during the evaluation of an
498 expression (that is, if the result is not mathematically defined or not
499 in the range of representable values for its type), the behavior is
500 undefined.
501
502 (6.5, the 5th paragraph)
503
504 I had assumed that on 2s complement machines signed arithmetic would
505 wrap, hence coded pp_add and pp_subtract on the assumption that
506 everything perl builds on would be happy. After much wailing and
507 gnashing of teeth it would seem that irix64 knows its ANSI spec well,
508 knows that it doesn't need to, and doesn't. Bah. Anyway, the all-
509 unsigned code below is actually shorter than the old code. :-)
510 */
511
01f91bf2 512 if (SvIV_please_nomg(svr)) {
28e5dec8
JH
513 /* Unless the left argument is integer in range we are going to have to
514 use NV maths. Hence only attempt to coerce the right argument if
515 we know the left is integer. */
eb578fdb 516 UV auv = 0;
9c5ffd7c 517 bool auvok = FALSE;
7dca457a
NC
518 bool a_valid = 0;
519
28e5dec8 520 if (!useleft) {
7dca457a
NC
521 auv = 0;
522 a_valid = auvok = 1;
523 /* left operand is undef, treat as zero. + 0 is identity,
524 Could SETi or SETu right now, but space optimise by not adding
525 lots of code to speed up what is probably a rarish case. */
526 } else {
527 /* Left operand is defined, so is it IV? */
01f91bf2 528 if (SvIV_please_nomg(svl)) {
800401ee
JH
529 if ((auvok = SvUOK(svl)))
530 auv = SvUVX(svl);
7dca457a 531 else {
eb578fdb 532 const IV aiv = SvIVX(svl);
7dca457a
NC
533 if (aiv >= 0) {
534 auv = aiv;
535 auvok = 1; /* Now acting as a sign flag. */
536 } else { /* 2s complement assumption for IV_MIN */
537 auv = (UV)-aiv;
538 }
539 }
540 a_valid = 1;
28e5dec8
JH
541 }
542 }
7dca457a
NC
543 if (a_valid) {
544 bool result_good = 0;
545 UV result;
eb578fdb 546 UV buv;
800401ee 547 bool buvok = SvUOK(svr);
a00b5bd3 548
7dca457a 549 if (buvok)
800401ee 550 buv = SvUVX(svr);
7dca457a 551 else {
eb578fdb 552 const IV biv = SvIVX(svr);
7dca457a
NC
553 if (biv >= 0) {
554 buv = biv;
555 buvok = 1;
556 } else
557 buv = (UV)-biv;
558 }
559 /* ?uvok if value is >= 0. basically, flagged as UV if it's +ve,
602f51c4 560 else "IV" now, independent of how it came in.
7dca457a
NC
561 if a, b represents positive, A, B negative, a maps to -A etc
562 a + b => (a + b)
563 A + b => -(a - b)
564 a + B => (a - b)
565 A + B => -(a + b)
566 all UV maths. negate result if A negative.
567 add if signs same, subtract if signs differ. */
568
569 if (auvok ^ buvok) {
570 /* Signs differ. */
571 if (auv >= buv) {
572 result = auv - buv;
573 /* Must get smaller */
574 if (result <= auv)
575 result_good = 1;
576 } else {
577 result = buv - auv;
578 if (result <= buv) {
579 /* result really should be -(auv-buv). as its negation
580 of true value, need to swap our result flag */
581 auvok = !auvok;
582 result_good = 1;
28e5dec8
JH
583 }
584 }
7dca457a
NC
585 } else {
586 /* Signs same */
587 result = auv + buv;
588 if (result >= auv)
589 result_good = 1;
590 }
591 if (result_good) {
592 SP--;
593 if (auvok)
28e5dec8 594 SETu( result );
7dca457a
NC
595 else {
596 /* Negate result */
597 if (result <= (UV)IV_MIN)
598 SETi( -(IV)result );
599 else {
600 /* result valid, but out of range for IV. */
601 SETn( -(NV)result );
28e5dec8
JH
602 }
603 }
7dca457a
NC
604 RETURN;
605 } /* Overflow, drop through to NVs. */
28e5dec8
JH
606 }
607 }
608#endif
a0d0e21e 609 {
6f1401dc 610 NV value = SvNV_nomg(svr);
4efa5a16 611 (void)POPs;
28e5dec8
JH
612 if (!useleft) {
613 /* left operand is undef, treat as zero. + 0.0 is identity. */
614 SETn(value);
615 RETURN;
616 }
6f1401dc 617 SETn( value + SvNV_nomg(svl) );
28e5dec8 618 RETURN;
a0d0e21e
LW
619 }
620}
621
622PP(pp_aelemfast)
623{
97aff369 624 dVAR; dSP;
93bad3fd 625 AV * const av = PL_op->op_type == OP_AELEMFAST_LEX
8f878375 626 ? MUTABLE_AV(PAD_SV(PL_op->op_targ)) : GvAVn(cGVOP_gv);
a3b680e6 627 const U32 lval = PL_op->op_flags & OPf_MOD;
0bd48802 628 SV** const svp = av_fetch(av, PL_op->op_private, lval);
3280af22 629 SV *sv = (svp ? *svp : &PL_sv_undef);
6ff81951 630 EXTEND(SP, 1);
39cf747a 631 if (!lval && SvRMAGICAL(av) && SvGMAGICAL(sv)) /* see note in pp_helem() */
fd69380d 632 mg_get(sv);
be6c24e0 633 PUSHs(sv);
a0d0e21e
LW
634 RETURN;
635}
636
637PP(pp_join)
638{
97aff369 639 dVAR; dSP; dMARK; dTARGET;
a0d0e21e
LW
640 MARK++;
641 do_join(TARG, *MARK, MARK, SP);
642 SP = MARK;
643 SETs(TARG);
644 RETURN;
645}
646
647PP(pp_pushre)
648{
97aff369 649 dVAR; dSP;
44a8e56a
PP
650#ifdef DEBUGGING
651 /*
652 * We ass_u_me that LvTARGOFF() comes first, and that two STRLENs
653 * will be enough to hold an OP*.
654 */
c4420975 655 SV* const sv = sv_newmortal();
44a8e56a
PP
656 sv_upgrade(sv, SVt_PVLV);
657 LvTYPE(sv) = '/';
533c011a 658 Copy(&PL_op, &LvTARGOFF(sv), 1, OP*);
44a8e56a
PP
659 XPUSHs(sv);
660#else
ad64d0ec 661 XPUSHs(MUTABLE_SV(PL_op));
44a8e56a 662#endif
a0d0e21e
LW
663 RETURN;
664}
665
666/* Oversized hot code. */
667
668PP(pp_print)
669{
27da23d5 670 dVAR; dSP; dMARK; dORIGMARK;
eb578fdb 671 PerlIO *fp;
236988e4 672 MAGIC *mg;
159b6efe
NC
673 GV * const gv
674 = (PL_op->op_flags & OPf_STACKED) ? MUTABLE_GV(*++MARK) : PL_defoutgv;
9c9f25b8 675 IO *io = GvIO(gv);
5b468f54 676
9c9f25b8 677 if (io
ad64d0ec 678 && (mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar)))
5b468f54 679 {
01bb7c6d 680 had_magic:
68dc0745 681 if (MARK == ORIGMARK) {
1c846c1f 682 /* If using default handle then we need to make space to
a60c0954
NIS
683 * pass object as 1st arg, so move other args up ...
684 */
4352c267 685 MEXTEND(SP, 1);
68dc0745
PP
686 ++MARK;
687 Move(MARK, MARK + 1, (SP - MARK) + 1, SV*);
688 ++SP;
689 }
94bc412f
NC
690 return Perl_tied_method(aTHX_ "PRINT", mark - 1, MUTABLE_SV(io),
691 mg,
692 (G_SCALAR | TIED_METHOD_ARGUMENTS_ON_STACK
693 | (PL_op->op_type == OP_SAY
694 ? TIED_METHOD_SAY : 0)), sp - mark);
236988e4 695 }
9c9f25b8 696 if (!io) {
68b590d9 697 if ( gv && GvEGVx(gv) && (io = GvIO(GvEGV(gv)))
ad64d0ec 698 && (mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar)))
01bb7c6d 699 goto had_magic;
51087808 700 report_evil_fh(gv);
93189314 701 SETERRNO(EBADF,RMS_IFI);
a0d0e21e
LW
702 goto just_say_no;
703 }
704 else if (!(fp = IoOFP(io))) {
7716c5c5
NC
705 if (IoIFP(io))
706 report_wrongway_fh(gv, '<');
51087808 707 else
7716c5c5 708 report_evil_fh(gv);
93189314 709 SETERRNO(EBADF,IoIFP(io)?RMS_FAC:RMS_IFI);
a0d0e21e
LW
710 goto just_say_no;
711 }
712 else {
e23d9e2f 713 SV * const ofs = GvSV(PL_ofsgv); /* $, */
a0d0e21e 714 MARK++;
e23d9e2f 715 if (ofs && (SvGMAGICAL(ofs) || SvOK(ofs))) {
a0d0e21e
LW
716 while (MARK <= SP) {
717 if (!do_print(*MARK, fp))
718 break;
719 MARK++;
720 if (MARK <= SP) {
e23d9e2f
CS
721 /* don't use 'ofs' here - it may be invalidated by magic callbacks */
722 if (!do_print(GvSV(PL_ofsgv), fp)) {
a0d0e21e
LW
723 MARK--;
724 break;
725 }
726 }
727 }
728 }
729 else {
730 while (MARK <= SP) {
731 if (!do_print(*MARK, fp))
732 break;
733 MARK++;
734 }
735 }
736 if (MARK <= SP)
737 goto just_say_no;
738 else {
cfc4a7da
GA
739 if (PL_op->op_type == OP_SAY) {
740 if (PerlIO_write(fp, "\n", 1) == 0 || PerlIO_error(fp))
741 goto just_say_no;
742 }
743 else if (PL_ors_sv && SvOK(PL_ors_sv))
7889fe52 744 if (!do_print(PL_ors_sv, fp)) /* $\ */
a0d0e21e
LW
745 goto just_say_no;
746
747 if (IoFLAGS(io) & IOf_FLUSH)
760ac839 748 if (PerlIO_flush(fp) == EOF)
a0d0e21e
LW
749 goto just_say_no;
750 }
751 }
752 SP = ORIGMARK;
e52fd6f4 753 XPUSHs(&PL_sv_yes);
a0d0e21e
LW
754 RETURN;
755
756 just_say_no:
757 SP = ORIGMARK;
e52fd6f4 758 XPUSHs(&PL_sv_undef);
a0d0e21e
LW
759 RETURN;
760}
761
762PP(pp_rv2av)
763{
97aff369 764 dVAR; dSP; dTOPss;
cde874ca 765 const I32 gimme = GIMME_V;
17ab7946
NC
766 static const char an_array[] = "an ARRAY";
767 static const char a_hash[] = "a HASH";
768 const bool is_pp_rv2av = PL_op->op_type == OP_RV2AV;
d83b45b8 769 const svtype type = is_pp_rv2av ? SVt_PVAV : SVt_PVHV;
a0d0e21e 770
9026059d 771 SvGETMAGIC(sv);
a0d0e21e 772 if (SvROK(sv)) {
93d7320b
DM
773 if (SvAMAGIC(sv)) {
774 sv = amagic_deref_call(sv, is_pp_rv2av ? to_av_amg : to_hv_amg);
93d7320b 775 }
17ab7946
NC
776 sv = SvRV(sv);
777 if (SvTYPE(sv) != type)
dcbac5bb 778 /* diag_listed_as: Not an ARRAY reference */
17ab7946 779 DIE(aTHX_ "Not %s reference", is_pp_rv2av ? an_array : a_hash);
3da99855
FC
780 else if (PL_op->op_flags & OPf_MOD
781 && PL_op->op_private & OPpLVAL_INTRO)
782 Perl_croak(aTHX_ "%s", PL_no_localize_ref);
a0d0e21e 783 }
9f527363 784 else if (SvTYPE(sv) != type) {
67955e0c 785 GV *gv;
1c846c1f 786
6e592b3a 787 if (!isGV_with_GP(sv)) {
dc3c76f8
NC
788 gv = Perl_softref2xv(aTHX_ sv, is_pp_rv2av ? an_array : a_hash,
789 type, &sp);
790 if (!gv)
791 RETURN;
35cd451c
GS
792 }
793 else {
159b6efe 794 gv = MUTABLE_GV(sv);
a0d0e21e 795 }
ad64d0ec 796 sv = is_pp_rv2av ? MUTABLE_SV(GvAVn(gv)) : MUTABLE_SV(GvHVn(gv));
533c011a 797 if (PL_op->op_private & OPpLVAL_INTRO)
ad64d0ec 798 sv = is_pp_rv2av ? MUTABLE_SV(save_ary(gv)) : MUTABLE_SV(save_hash(gv));
9f527363
FC
799 }
800 if (PL_op->op_flags & OPf_REF) {
17ab7946 801 SETs(sv);
a0d0e21e 802 RETURN;
9f527363
FC
803 }
804 else if (PL_op->op_private & OPpMAYBE_LVSUB) {
40c94d11
FC
805 const I32 flags = is_lvalue_sub();
806 if (flags && !(flags & OPpENTERSUB_INARGS)) {
cde874ca 807 if (gimme != G_ARRAY)
042560a6 808 goto croak_cant_return;
17ab7946 809 SETs(sv);
78f9721b 810 RETURN;
40c94d11 811 }
a0d0e21e
LW
812 }
813
17ab7946 814 if (is_pp_rv2av) {
502c6561 815 AV *const av = MUTABLE_AV(sv);
486ec47a 816 /* The guts of pp_rv2av, with no intending change to preserve history
17ab7946
NC
817 (until such time as we get tools that can do blame annotation across
818 whitespace changes. */
96913b52
VP
819 if (gimme == G_ARRAY) {
820 const I32 maxarg = AvFILL(av) + 1;
821 (void)POPs; /* XXXX May be optimized away? */
822 EXTEND(SP, maxarg);
823 if (SvRMAGICAL(av)) {
824 U32 i;
825 for (i=0; i < (U32)maxarg; i++) {
826 SV ** const svp = av_fetch(av, i, FALSE);
827 /* See note in pp_helem, and bug id #27839 */
828 SP[i+1] = svp
829 ? SvGMAGICAL(*svp) ? (mg_get(*svp), *svp) : *svp
830 : &PL_sv_undef;
831 }
832 }
833 else {
834 Copy(AvARRAY(av), SP+1, maxarg, SV*);
93965878 835 }
96913b52 836 SP += maxarg;
1c846c1f 837 }
96913b52
VP
838 else if (gimme == G_SCALAR) {
839 dTARGET;
840 const I32 maxarg = AvFILL(av) + 1;
841 SETi(maxarg);
93965878 842 }
17ab7946
NC
843 } else {
844 /* The guts of pp_rv2hv */
96913b52
VP
845 if (gimme == G_ARRAY) { /* array wanted */
846 *PL_stack_sp = sv;
981b7185 847 return Perl_do_kv(aTHX);
96913b52 848 }
c8fe3bdf 849 else if ((PL_op->op_private & OPpTRUEBOOL
adc42c31 850 || ( PL_op->op_private & OPpMAYBE_TRUEBOOL
c8fe3bdf
FC
851 && block_gimme() == G_VOID ))
852 && (!SvRMAGICAL(sv) || !mg_find(sv, PERL_MAGIC_tied)))
853 SETs(HvUSEDKEYS(sv) ? &PL_sv_yes : sv_2mortal(newSViv(0)));
96913b52
VP
854 else if (gimme == G_SCALAR) {
855 dTARGET;
856 TARG = Perl_hv_scalar(aTHX_ MUTABLE_HV(sv));
857 SPAGAIN;
858 SETTARG;
859 }
17ab7946 860 }
be85d344 861 RETURN;
042560a6
NC
862
863 croak_cant_return:
864 Perl_croak(aTHX_ "Can't return %s to lvalue scalar context",
865 is_pp_rv2av ? "array" : "hash");
77e217c6 866 RETURN;
a0d0e21e
LW
867}
868
10c8fecd
GS
869STATIC void
870S_do_oddball(pTHX_ HV *hash, SV **relem, SV **firstrelem)
871{
97aff369 872 dVAR;
7918f24d
NC
873
874 PERL_ARGS_ASSERT_DO_ODDBALL;
875
10c8fecd
GS
876 if (*relem) {
877 SV *tmpstr;
b464bac0 878 const HE *didstore;
6d822dc4
MS
879
880 if (ckWARN(WARN_MISC)) {
a3b680e6 881 const char *err;
10c8fecd
GS
882 if (relem == firstrelem &&
883 SvROK(*relem) &&
884 (SvTYPE(SvRV(*relem)) == SVt_PVAV ||
885 SvTYPE(SvRV(*relem)) == SVt_PVHV))
886 {
a3b680e6 887 err = "Reference found where even-sized list expected";
10c8fecd
GS
888 }
889 else
a3b680e6 890 err = "Odd number of elements in hash assignment";
f1f66076 891 Perl_warner(aTHX_ packWARN(WARN_MISC), "%s", err);
10c8fecd 892 }
6d822dc4 893
561b68a9 894 tmpstr = newSV(0);
6d822dc4
MS
895 didstore = hv_store_ent(hash,*relem,tmpstr,0);
896 if (SvMAGICAL(hash)) {
897 if (SvSMAGICAL(tmpstr))
898 mg_set(tmpstr);
899 if (!didstore)
900 sv_2mortal(tmpstr);
901 }
902 TAINT_NOT;
10c8fecd
GS
903 }
904}
905
a0d0e21e
LW
906PP(pp_aassign)
907{
27da23d5 908 dVAR; dSP;
3280af22
NIS
909 SV **lastlelem = PL_stack_sp;
910 SV **lastrelem = PL_stack_base + POPMARK;
911 SV **firstrelem = PL_stack_base + POPMARK + 1;
a0d0e21e
LW
912 SV **firstlelem = lastrelem + 1;
913
eb578fdb
KW
914 SV **relem;
915 SV **lelem;
a0d0e21e 916
eb578fdb
KW
917 SV *sv;
918 AV *ary;
a0d0e21e 919
54310121 920 I32 gimme;
a0d0e21e
LW
921 HV *hash;
922 I32 i;
923 int magic;
ca65944e 924 int duplicates = 0;
cbbf8932 925 SV **firsthashrelem = NULL; /* "= 0" keeps gcc 2.95 quiet */
5637b936 926
3280af22 927 PL_delaymagic = DM_DELAY; /* catch simultaneous items */
ca65944e 928 gimme = GIMME_V;
a0d0e21e
LW
929
930 /* If there's a common identifier on both sides we have to take
931 * special care that assigning the identifier on the left doesn't
932 * clobber a value on the right that's used later in the list.
acdea6f0 933 * Don't bother if LHS is just an empty hash or array.
a0d0e21e 934 */
acdea6f0
DM
935
936 if ( (PL_op->op_private & OPpASSIGN_COMMON)
937 && (
938 firstlelem != lastlelem
939 || ! ((sv = *firstlelem))
940 || SvMAGICAL(sv)
941 || ! (SvTYPE(sv) == SVt_PVAV || SvTYPE(sv) == SVt_PVHV)
942 || (SvTYPE(sv) == SVt_PVAV && AvFILL((AV*)sv) != -1)
1b95d04f 943 || (SvTYPE(sv) == SVt_PVHV && HvUSEDKEYS((HV*)sv) != 0)
acdea6f0
DM
944 )
945 ) {
cc5e57d2 946 EXTEND_MORTAL(lastrelem - firstrelem + 1);
10c8fecd 947 for (relem = firstrelem; relem <= lastrelem; relem++) {
155aba94 948 if ((sv = *relem)) {
a1f49e72 949 TAINT_NOT; /* Each item is independent */
61e5f455
NC
950
951 /* Dear TODO test in t/op/sort.t, I love you.
952 (It's relying on a panic, not a "semi-panic" from newSVsv()
953 and then an assertion failure below.) */
954 if (SvIS_FREED(sv)) {
955 Perl_croak(aTHX_ "panic: attempt to copy freed scalar %p",
956 (void*)sv);
957 }
958 /* Specifically *not* sv_mortalcopy(), as that will steal TEMPs,
959 and we need a second copy of a temp here. */
960 *relem = sv_2mortal(newSVsv(sv));
a1f49e72 961 }
10c8fecd 962 }
a0d0e21e
LW
963 }
964
965 relem = firstrelem;
966 lelem = firstlelem;
4608196e
RGS
967 ary = NULL;
968 hash = NULL;
10c8fecd 969
a0d0e21e 970 while (lelem <= lastlelem) {
bbce6d69 971 TAINT_NOT; /* Each item stands on its own, taintwise. */
a0d0e21e
LW
972 sv = *lelem++;
973 switch (SvTYPE(sv)) {
974 case SVt_PVAV:
60edcf09 975 ary = MUTABLE_AV(sv);
748a9306 976 magic = SvMAGICAL(ary) != 0;
60edcf09
FC
977 ENTER;
978 SAVEFREESV(SvREFCNT_inc_simple_NN(sv));
a0d0e21e 979 av_clear(ary);
7e42bd57 980 av_extend(ary, lastrelem - relem);
a0d0e21e
LW
981 i = 0;
982 while (relem <= lastrelem) { /* gobble up all the rest */
5117ca91 983 SV **didstore;
a0d0e21e 984 assert(*relem);
4f0556e9
NC
985 sv = newSV(0);
986 sv_setsv(sv, *relem);
a0d0e21e 987 *(relem++) = sv;
5117ca91
GS
988 didstore = av_store(ary,i++,sv);
989 if (magic) {
8ef24240 990 if (SvSMAGICAL(sv))
fb73857a 991 mg_set(sv);
5117ca91 992 if (!didstore)
8127e0e3 993 sv_2mortal(sv);
5117ca91 994 }
bbce6d69 995 TAINT_NOT;
a0d0e21e 996 }
354b0578 997 if (PL_delaymagic & DM_ARRAY_ISA)
ad64d0ec 998 SvSETMAGIC(MUTABLE_SV(ary));
60edcf09 999 LEAVE;
a0d0e21e 1000 break;
10c8fecd 1001 case SVt_PVHV: { /* normal hash */
a0d0e21e 1002 SV *tmpstr;
45960564 1003 SV** topelem = relem;
a0d0e21e 1004
60edcf09 1005 hash = MUTABLE_HV(sv);
748a9306 1006 magic = SvMAGICAL(hash) != 0;
60edcf09
FC
1007 ENTER;
1008 SAVEFREESV(SvREFCNT_inc_simple_NN(sv));
a0d0e21e 1009 hv_clear(hash);
ca65944e 1010 firsthashrelem = relem;
a0d0e21e
LW
1011
1012 while (relem < lastrelem) { /* gobble up all the rest */
5117ca91 1013 HE *didstore;
6136c704
AL
1014 sv = *relem ? *relem : &PL_sv_no;
1015 relem++;
561b68a9 1016 tmpstr = newSV(0);
a0d0e21e
LW
1017 if (*relem)
1018 sv_setsv(tmpstr,*relem); /* value */
45960564
DM
1019 relem++;
1020 if (gimme != G_VOID) {
1021 if (hv_exists_ent(hash, sv, 0))
1022 /* key overwrites an existing entry */
1023 duplicates += 2;
1024 else
1025 if (gimme == G_ARRAY) {
1026 /* copy element back: possibly to an earlier
1027 * stack location if we encountered dups earlier */
1028 *topelem++ = sv;
1029 *topelem++ = tmpstr;
1030 }
1031 }
5117ca91
GS
1032 didstore = hv_store_ent(hash,sv,tmpstr,0);
1033 if (magic) {
8ef24240 1034 if (SvSMAGICAL(tmpstr))
fb73857a 1035 mg_set(tmpstr);
5117ca91 1036 if (!didstore)
8127e0e3 1037 sv_2mortal(tmpstr);
5117ca91 1038 }
bbce6d69 1039 TAINT_NOT;
8e07c86e 1040 }
6a0deba8 1041 if (relem == lastrelem) {
10c8fecd 1042 do_oddball(hash, relem, firstrelem);
6a0deba8 1043 relem++;
1930e939 1044 }
60edcf09 1045 LEAVE;
a0d0e21e
LW
1046 }
1047 break;
1048 default:
6fc92669
GS
1049 if (SvIMMORTAL(sv)) {
1050 if (relem <= lastrelem)
1051 relem++;
1052 break;
a0d0e21e
LW
1053 }
1054 if (relem <= lastrelem) {
1c70fb82
FC
1055 if (
1056 SvTEMP(sv) && !SvSMAGICAL(sv) && SvREFCNT(sv) == 1 &&
1057 (!isGV_with_GP(sv) || SvFAKE(sv)) && ckWARN(WARN_MISC)
1058 )
1059 Perl_warner(aTHX_
1060 packWARN(WARN_MISC),
1061 "Useless assignment to a temporary"
1062 );
a0d0e21e
LW
1063 sv_setsv(sv, *relem);
1064 *(relem++) = sv;
1065 }
1066 else
3280af22 1067 sv_setsv(sv, &PL_sv_undef);
8ef24240 1068 SvSETMAGIC(sv);
a0d0e21e
LW
1069 break;
1070 }
1071 }
3280af22 1072 if (PL_delaymagic & ~DM_DELAY) {
985213f2
AB
1073 /* Will be used to set PL_tainting below */
1074 UV tmp_uid = PerlProc_getuid();
1075 UV tmp_euid = PerlProc_geteuid();
1076 UV tmp_gid = PerlProc_getgid();
1077 UV tmp_egid = PerlProc_getegid();
1078
3280af22 1079 if (PL_delaymagic & DM_UID) {
a0d0e21e 1080#ifdef HAS_SETRESUID
985213f2
AB
1081 (void)setresuid((PL_delaymagic & DM_RUID) ? PL_delaymagic_uid : (Uid_t)-1,
1082 (PL_delaymagic & DM_EUID) ? PL_delaymagic_euid : (Uid_t)-1,
fb934a90 1083 (Uid_t)-1);
56febc5e
AD
1084#else
1085# ifdef HAS_SETREUID
985213f2
AB
1086 (void)setreuid((PL_delaymagic & DM_RUID) ? PL_delaymagic_uid : (Uid_t)-1,
1087 (PL_delaymagic & DM_EUID) ? PL_delaymagic_euid : (Uid_t)-1);
56febc5e
AD
1088# else
1089# ifdef HAS_SETRUID
b28d0864 1090 if ((PL_delaymagic & DM_UID) == DM_RUID) {
985213f2 1091 (void)setruid(PL_delaymagic_uid);
b28d0864 1092 PL_delaymagic &= ~DM_RUID;
a0d0e21e 1093 }
56febc5e
AD
1094# endif /* HAS_SETRUID */
1095# ifdef HAS_SETEUID
b28d0864 1096 if ((PL_delaymagic & DM_UID) == DM_EUID) {
985213f2 1097 (void)seteuid(PL_delaymagic_euid);
b28d0864 1098 PL_delaymagic &= ~DM_EUID;
a0d0e21e 1099 }
56febc5e 1100# endif /* HAS_SETEUID */
b28d0864 1101 if (PL_delaymagic & DM_UID) {
985213f2 1102 if (PL_delaymagic_uid != PL_delaymagic_euid)
cea2e8a9 1103 DIE(aTHX_ "No setreuid available");
985213f2 1104 (void)PerlProc_setuid(PL_delaymagic_uid);
a0d0e21e 1105 }
56febc5e
AD
1106# endif /* HAS_SETREUID */
1107#endif /* HAS_SETRESUID */
985213f2
AB
1108 tmp_uid = PerlProc_getuid();
1109 tmp_euid = PerlProc_geteuid();
a0d0e21e 1110 }
3280af22 1111 if (PL_delaymagic & DM_GID) {
a0d0e21e 1112#ifdef HAS_SETRESGID
985213f2
AB
1113 (void)setresgid((PL_delaymagic & DM_RGID) ? PL_delaymagic_gid : (Gid_t)-1,
1114 (PL_delaymagic & DM_EGID) ? PL_delaymagic_egid : (Gid_t)-1,
fb934a90 1115 (Gid_t)-1);
56febc5e
AD
1116#else
1117# ifdef HAS_SETREGID
985213f2
AB
1118 (void)setregid((PL_delaymagic & DM_RGID) ? PL_delaymagic_gid : (Gid_t)-1,
1119 (PL_delaymagic & DM_EGID) ? PL_delaymagic_egid : (Gid_t)-1);
56febc5e
AD
1120# else
1121# ifdef HAS_SETRGID
b28d0864 1122 if ((PL_delaymagic & DM_GID) == DM_RGID) {
985213f2 1123 (void)setrgid(PL_delaymagic_gid);
b28d0864 1124 PL_delaymagic &= ~DM_RGID;
a0d0e21e 1125 }
56febc5e
AD
1126# endif /* HAS_SETRGID */
1127# ifdef HAS_SETEGID
b28d0864 1128 if ((PL_delaymagic & DM_GID) == DM_EGID) {
985213f2 1129 (void)setegid(PL_delaymagic_egid);
b28d0864 1130 PL_delaymagic &= ~DM_EGID;
a0d0e21e 1131 }
56febc5e 1132# endif /* HAS_SETEGID */
b28d0864 1133 if (PL_delaymagic & DM_GID) {
985213f2 1134 if (PL_delaymagic_gid != PL_delaymagic_egid)
cea2e8a9 1135 DIE(aTHX_ "No setregid available");
985213f2 1136 (void)PerlProc_setgid(PL_delaymagic_gid);
a0d0e21e 1137 }
56febc5e
AD
1138# endif /* HAS_SETREGID */
1139#endif /* HAS_SETRESGID */
985213f2
AB
1140 tmp_gid = PerlProc_getgid();
1141 tmp_egid = PerlProc_getegid();
a0d0e21e 1142 }
985213f2 1143 PL_tainting |= (tmp_uid && (tmp_euid != tmp_uid || tmp_egid != tmp_gid));
a0d0e21e 1144 }
3280af22 1145 PL_delaymagic = 0;
54310121 1146
54310121
PP
1147 if (gimme == G_VOID)
1148 SP = firstrelem - 1;
1149 else if (gimme == G_SCALAR) {
1150 dTARGET;
1151 SP = firstrelem;
ca65944e 1152 SETi(lastrelem - firstrelem + 1 - duplicates);
54310121
PP
1153 }
1154 else {
ca65944e 1155 if (ary)
a0d0e21e 1156 SP = lastrelem;
ca65944e
RGS
1157 else if (hash) {
1158 if (duplicates) {
45960564
DM
1159 /* at this point we have removed the duplicate key/value
1160 * pairs from the stack, but the remaining values may be
1161 * wrong; i.e. with (a 1 a 2 b 3) on the stack we've removed
1162 * the (a 2), but the stack now probably contains
1163 * (a <freed> b 3), because { hv_save(a,1); hv_save(a,2) }
1164 * obliterates the earlier key. So refresh all values. */
ca65944e 1165 lastrelem -= duplicates;
45960564
DM
1166 relem = firsthashrelem;
1167 while (relem < lastrelem) {
1168 HE *he;
1169 sv = *relem++;
1170 he = hv_fetch_ent(hash, sv, 0, 0);
1171 *relem++ = (he ? HeVAL(he) : &PL_sv_undef);
1172 }
ca65944e
RGS
1173 }
1174 SP = lastrelem;
1175 }
a0d0e21e
LW
1176 else
1177 SP = firstrelem + (lastlelem - firstlelem);
0c8c7a05 1178 lelem = firstlelem + (relem - firstrelem);
5f05dabc 1179 while (relem <= SP)
3280af22 1180 *relem++ = (lelem <= lastlelem) ? *lelem++ : &PL_sv_undef;
a0d0e21e 1181 }
08aeb9f7 1182
54310121 1183 RETURN;
a0d0e21e
LW
1184}
1185
8782bef2
GB
1186PP(pp_qr)
1187{
97aff369 1188 dVAR; dSP;
eb578fdb 1189 PMOP * const pm = cPMOP;
fe578d7f 1190 REGEXP * rx = PM_GETRE(pm);
10599a69 1191 SV * const pkg = rx ? CALLREG_PACKAGE(rx) : NULL;
c4420975 1192 SV * const rv = sv_newmortal();
d63c20f2
DM
1193 CV **cvp;
1194 CV *cv;
288b8c02
NC
1195
1196 SvUPGRADE(rv, SVt_IV);
c2123ae3
NC
1197 /* For a subroutine describing itself as "This is a hacky workaround" I'm
1198 loathe to use it here, but it seems to be the right fix. Or close.
1199 The key part appears to be that it's essential for pp_qr to return a new
1200 object (SV), which implies that there needs to be an effective way to
1201 generate a new SV from the existing SV that is pre-compiled in the
1202 optree. */
1203 SvRV_set(rv, MUTABLE_SV(reg_temp_copy(NULL, rx)));
288b8c02
NC
1204 SvROK_on(rv);
1205
d63c20f2
DM
1206 cvp = &( ((struct regexp*)SvANY(SvRV(rv)))->qr_anoncv);
1207 if ((cv = *cvp) && CvCLONE(*cvp)) {
1208 *cvp = cv_clone(cv);
1209 SvREFCNT_dec(cv);
1210 }
1211
288b8c02 1212 if (pkg) {
f815daf2 1213 HV *const stash = gv_stashsv(pkg, GV_ADD);
a954f6ee 1214 SvREFCNT_dec(pkg);
288b8c02
NC
1215 (void)sv_bless(rv, stash);
1216 }
1217
9274aefd 1218 if (RX_EXTFLAGS(rx) & RXf_TAINTED) {
e08e52cf 1219 SvTAINTED_on(rv);
9274aefd
DM
1220 SvTAINTED_on(SvRV(rv));
1221 }
c8c13c22 1222 XPUSHs(rv);
1223 RETURN;
8782bef2
GB
1224}
1225
a0d0e21e
LW
1226PP(pp_match)
1227{
97aff369 1228 dVAR; dSP; dTARG;
eb578fdb 1229 PMOP *pm = cPMOP;
d65afb4b 1230 PMOP *dynpm = pm;
eb578fdb
KW
1231 const char *t;
1232 const char *s;
5c144d81 1233 const char *strend;
a0d0e21e 1234 I32 global;
1ed74d04 1235 U8 r_flags = REXEC_CHECKED;
5c144d81 1236 const char *truebase; /* Start of string */
eb578fdb 1237 REGEXP *rx = PM_GETRE(pm);
b3eb6a9b 1238 bool rxtainted;
a3b680e6 1239 const I32 gimme = GIMME;
a0d0e21e 1240 STRLEN len;
748a9306 1241 I32 minmatch = 0;
a3b680e6 1242 const I32 oldsave = PL_savestack_ix;
f86702cc 1243 I32 update_minmatch = 1;
e60df1fa 1244 I32 had_zerolen = 0;
58e23c8d 1245 U32 gpos = 0;
a0d0e21e 1246
533c011a 1247 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 1248 TARG = POPs;
59f00321
RGS
1249 else if (PL_op->op_private & OPpTARGET_MY)
1250 GETTARGET;
a0d0e21e 1251 else {
54b9620d 1252 TARG = DEFSV;
a0d0e21e
LW
1253 EXTEND(SP,1);
1254 }
d9f424b2 1255
c277df42 1256 PUTBACK; /* EVAL blocks need stack_sp. */
69dc4b30
FC
1257 /* Skip get-magic if this is a qr// clone, because regcomp has
1258 already done it. */
1259 s = ((struct regexp *)SvANY(rx))->mother_re
1260 ? SvPV_nomg_const(TARG, len)
1261 : SvPV_const(TARG, len);
a0d0e21e 1262 if (!s)
2269b42e 1263 DIE(aTHX_ "panic: pp_match");
890ce7af 1264 strend = s + len;
07bc277f 1265 rxtainted = ((RX_EXTFLAGS(rx) & RXf_TAINTED) ||
3280af22 1266 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
9212bbba 1267 TAINT_NOT;
a0d0e21e 1268
a30b2f1f 1269 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 1270
d65afb4b 1271 /* PMdf_USED is set after a ?? matches once */
c737faaf
YO
1272 if (
1273#ifdef USE_ITHREADS
1274 SvREADONLY(PL_regex_pad[pm->op_pmoffset])
1275#else
1276 pm->op_pmflags & PMf_USED
1277#endif
1278 ) {
e5dc5375 1279 DEBUG_r(PerlIO_printf(Perl_debug_log, "?? already matched once"));
c277df42 1280 failure:
e5dc5375 1281
a0d0e21e
LW
1282 if (gimme == G_ARRAY)
1283 RETURN;
1284 RETPUSHNO;
1285 }
1286
c737faaf
YO
1287
1288
d65afb4b 1289 /* empty pattern special-cased to use last successful pattern if possible */
220fc49f 1290 if (!RX_PRELEN(rx) && PL_curpm) {
3280af22 1291 pm = PL_curpm;
aaa362c4 1292 rx = PM_GETRE(pm);
a0d0e21e 1293 }
d65afb4b 1294
e5dc5375
KW
1295 if (RX_MINLEN(rx) > (I32)len) {
1296 DEBUG_r(PerlIO_printf(Perl_debug_log, "String shorter than min possible regex match\n"));
d65afb4b 1297 goto failure;
e5dc5375 1298 }
c277df42 1299
a0d0e21e 1300 truebase = t = s;
ad94a511
IZ
1301
1302 /* XXXX What part of this is needed with true \G-support? */
d65afb4b 1303 if ((global = dynpm->op_pmflags & PMf_GLOBAL)) {
07bc277f 1304 RX_OFFS(rx)[0].start = -1;
a0d0e21e 1305 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
c445ea15 1306 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
565764a8 1307 if (mg && mg->mg_len >= 0) {
07bc277f
NC
1308 if (!(RX_EXTFLAGS(rx) & RXf_GPOS_SEEN))
1309 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1310 else if (RX_EXTFLAGS(rx) & RXf_ANCH_GPOS) {
0ef3e39e 1311 r_flags |= REXEC_IGNOREPOS;
07bc277f
NC
1312 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1313 } else if (RX_EXTFLAGS(rx) & RXf_GPOS_FLOAT)
58e23c8d
YO
1314 gpos = mg->mg_len;
1315 else
07bc277f
NC
1316 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1317 minmatch = (mg->mg_flags & MGf_MINMATCH) ? RX_GOFS(rx) + 1 : 0;
f86702cc 1318 update_minmatch = 0;
748a9306 1319 }
a0d0e21e
LW
1320 }
1321 }
a229a030 1322 /* XXX: comment out !global get safe $1 vars after a
62e7980d 1323 match, BUT be aware that this leads to dramatic slowdowns on
a229a030
YO
1324 /g matches against large strings. So far a solution to this problem
1325 appears to be quite tricky.
1326 Test for the unsafe vars are TODO for now. */
0d8a731b
DM
1327 if ( (!global && RX_NPARENS(rx))
1328 || SvTEMP(TARG) || SvAMAGIC(TARG) || PL_sawampersand
1329 || (RX_EXTFLAGS(rx) & (RXf_EVAL_SEEN|RXf_PMf_KEEPCOPY)))
14977893 1330 r_flags |= REXEC_COPY_STR;
22e551b9 1331
d7be1480 1332 play_it_again:
07bc277f
NC
1333 if (global && RX_OFFS(rx)[0].start != -1) {
1334 t = s = RX_OFFS(rx)[0].end + truebase - RX_GOFS(rx);
e5dc5375
KW
1335 if ((s + RX_MINLEN(rx)) > strend || s < truebase) {
1336 DEBUG_r(PerlIO_printf(Perl_debug_log, "Regex match can't succeed, so not even tried\n"));
a0d0e21e 1337 goto nope;
e5dc5375 1338 }
f86702cc 1339 if (update_minmatch++)
e60df1fa 1340 minmatch = had_zerolen;
a0d0e21e 1341 }
07bc277f 1342 if (RX_EXTFLAGS(rx) & RXf_USE_INTUIT &&
3c8556c3 1343 DO_UTF8(TARG) == (RX_UTF8(rx) != 0)) {
5c144d81
NC
1344 /* FIXME - can PL_bostr be made const char *? */
1345 PL_bostr = (char *)truebase;
f9f4320a 1346 s = CALLREG_INTUIT_START(rx, TARG, (char *)s, (char *)strend, r_flags, NULL);
f722798b
IZ
1347
1348 if (!s)
1349 goto nope;
07bc277f 1350 if ( (RX_EXTFLAGS(rx) & RXf_CHECK_ALL)
14977893 1351 && !PL_sawampersand
07bc277f 1352 && !(RX_EXTFLAGS(rx) & RXf_PMf_KEEPCOPY)
05b4157f 1353 && !SvROK(TARG)) /* Cannot trust since INTUIT cannot guess ^ */
f722798b 1354 goto yup;
a0d0e21e 1355 }
77da2310
NC
1356 if (!CALLREGEXEC(rx, (char*)s, (char *)strend, (char*)truebase,
1357 minmatch, TARG, NUM2PTR(void*, gpos), r_flags))
1358 goto ret_no;
1359
1360 PL_curpm = pm;
1361 if (dynpm->op_pmflags & PMf_ONCE) {
c737faaf 1362#ifdef USE_ITHREADS
77da2310 1363 SvREADONLY_on(PL_regex_pad[dynpm->op_pmoffset]);
c737faaf 1364#else
77da2310 1365 dynpm->op_pmflags |= PMf_USED;
c737faaf 1366#endif
a0d0e21e 1367 }
a0d0e21e
LW
1368
1369 gotcha:
72311751
GS
1370 if (rxtainted)
1371 RX_MATCH_TAINTED_on(rx);
1372 TAINT_IF(RX_MATCH_TAINTED(rx));
a0d0e21e 1373 if (gimme == G_ARRAY) {
07bc277f 1374 const I32 nparens = RX_NPARENS(rx);
a3b680e6 1375 I32 i = (global && !nparens) ? 1 : 0;
a0d0e21e 1376
c277df42 1377 SPAGAIN; /* EVAL blocks could move the stack. */
ffc61ed2
JH
1378 EXTEND(SP, nparens + i);
1379 EXTEND_MORTAL(nparens + i);
1380 for (i = !i; i <= nparens; i++) {
a0d0e21e 1381 PUSHs(sv_newmortal());
07bc277f
NC
1382 if ((RX_OFFS(rx)[i].start != -1) && RX_OFFS(rx)[i].end != -1 ) {
1383 const I32 len = RX_OFFS(rx)[i].end - RX_OFFS(rx)[i].start;
1384 s = RX_OFFS(rx)[i].start + truebase;
1385 if (RX_OFFS(rx)[i].end < 0 || RX_OFFS(rx)[i].start < 0 ||
290deeac 1386 len < 0 || len > strend - s)
5637ef5b
NC
1387 DIE(aTHX_ "panic: pp_match start/end pointers, i=%ld, "
1388 "start=%ld, end=%ld, s=%p, strend=%p, len=%"UVuf,
1389 (long) i, (long) RX_OFFS(rx)[i].start,
1390 (long)RX_OFFS(rx)[i].end, s, strend, (UV) len);
a0d0e21e 1391 sv_setpvn(*SP, s, len);
cce850e4 1392 if (DO_UTF8(TARG) && is_utf8_string((U8*)s, len))
a197cbdd 1393 SvUTF8_on(*SP);
a0d0e21e
LW
1394 }
1395 }
1396 if (global) {
d65afb4b 1397 if (dynpm->op_pmflags & PMf_CONTINUE) {
6136c704 1398 MAGIC* mg = NULL;
0af80b60
HS
1399 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
1400 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1401 if (!mg) {
d83f0a82
NC
1402#ifdef PERL_OLD_COPY_ON_WRITE
1403 if (SvIsCOW(TARG))
1404 sv_force_normal_flags(TARG, 0);
1405#endif
1406 mg = sv_magicext(TARG, NULL, PERL_MAGIC_regex_global,
1407 &PL_vtbl_mglob, NULL, 0);
0af80b60 1408 }
07bc277f
NC
1409 if (RX_OFFS(rx)[0].start != -1) {
1410 mg->mg_len = RX_OFFS(rx)[0].end;
1411 if (RX_OFFS(rx)[0].start + RX_GOFS(rx) == (UV)RX_OFFS(rx)[0].end)
0af80b60
HS
1412 mg->mg_flags |= MGf_MINMATCH;
1413 else
1414 mg->mg_flags &= ~MGf_MINMATCH;
1415 }
1416 }
07bc277f
NC
1417 had_zerolen = (RX_OFFS(rx)[0].start != -1
1418 && (RX_OFFS(rx)[0].start + RX_GOFS(rx)
1419 == (UV)RX_OFFS(rx)[0].end));
c277df42 1420 PUTBACK; /* EVAL blocks may use stack */
cf93c79d 1421 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
1422 goto play_it_again;
1423 }
ffc61ed2 1424 else if (!nparens)
bde848c5 1425 XPUSHs(&PL_sv_yes);
4633a7c4 1426 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1427 RETURN;
1428 }
1429 else {
1430 if (global) {
cbbf8932 1431 MAGIC* mg;
a0d0e21e 1432 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
14befaf4 1433 mg = mg_find(TARG, PERL_MAGIC_regex_global);
cbbf8932
AL
1434 else
1435 mg = NULL;
a0d0e21e 1436 if (!mg) {
d83f0a82
NC
1437#ifdef PERL_OLD_COPY_ON_WRITE
1438 if (SvIsCOW(TARG))
1439 sv_force_normal_flags(TARG, 0);
1440#endif
1441 mg = sv_magicext(TARG, NULL, PERL_MAGIC_regex_global,
1442 &PL_vtbl_mglob, NULL, 0);
a0d0e21e 1443 }
07bc277f
NC
1444 if (RX_OFFS(rx)[0].start != -1) {
1445 mg->mg_len = RX_OFFS(rx)[0].end;
1446 if (RX_OFFS(rx)[0].start + RX_GOFS(rx) == (UV)RX_OFFS(rx)[0].end)
748a9306
LW
1447 mg->mg_flags |= MGf_MINMATCH;
1448 else
1449 mg->mg_flags &= ~MGf_MINMATCH;
1450 }
a0d0e21e 1451 }
4633a7c4 1452 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1453 RETPUSHYES;
1454 }
1455
f722798b 1456yup: /* Confirmed by INTUIT */
72311751
GS
1457 if (rxtainted)
1458 RX_MATCH_TAINTED_on(rx);
1459 TAINT_IF(RX_MATCH_TAINTED(rx));
3280af22 1460 PL_curpm = pm;
c737faaf
YO
1461 if (dynpm->op_pmflags & PMf_ONCE) {
1462#ifdef USE_ITHREADS
1463 SvREADONLY_on(PL_regex_pad[dynpm->op_pmoffset]);
1464#else
1465 dynpm->op_pmflags |= PMf_USED;
1466#endif
1467 }
cf93c79d 1468 if (RX_MATCH_COPIED(rx))
07bc277f 1469 Safefree(RX_SUBBEG(rx));
cf93c79d 1470 RX_MATCH_COPIED_off(rx);
07bc277f 1471 RX_SUBBEG(rx) = NULL;
a0d0e21e 1472 if (global) {
5c144d81 1473 /* FIXME - should rx->subbeg be const char *? */
07bc277f
NC
1474 RX_SUBBEG(rx) = (char *) truebase;
1475 RX_OFFS(rx)[0].start = s - truebase;
a30b2f1f 1476 if (RX_MATCH_UTF8(rx)) {
07bc277f
NC
1477 char * const t = (char*)utf8_hop((U8*)s, RX_MINLENRET(rx));
1478 RX_OFFS(rx)[0].end = t - truebase;
60aeb6fd
NIS
1479 }
1480 else {
07bc277f 1481 RX_OFFS(rx)[0].end = s - truebase + RX_MINLENRET(rx);
60aeb6fd 1482 }
07bc277f 1483 RX_SUBLEN(rx) = strend - truebase;
a0d0e21e 1484 goto gotcha;
1c846c1f 1485 }
07bc277f 1486 if (PL_sawampersand || RX_EXTFLAGS(rx) & RXf_PMf_KEEPCOPY) {
14977893 1487 I32 off;
f8c7b90f 1488#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
1489 if (SvIsCOW(TARG) || (SvFLAGS(TARG) & CAN_COW_MASK) == CAN_COW_FLAGS) {
1490 if (DEBUG_C_TEST) {
1491 PerlIO_printf(Perl_debug_log,
1492 "Copy on write: pp_match $& capture, type %d, truebase=%p, t=%p, difference %d\n",
6c9570dc 1493 (int) SvTYPE(TARG), (void*)truebase, (void*)t,
ed252734
NC
1494 (int)(t-truebase));
1495 }
bdd9a1b1
NC
1496 RX_SAVED_COPY(rx) = sv_setsv_cow(RX_SAVED_COPY(rx), TARG);
1497 RX_SUBBEG(rx)
1498 = (char *) SvPVX_const(RX_SAVED_COPY(rx)) + (t - truebase);
1499 assert (SvPOKp(RX_SAVED_COPY(rx)));
ed252734
NC
1500 } else
1501#endif
1502 {
14977893 1503
07bc277f 1504 RX_SUBBEG(rx) = savepvn(t, strend - t);
f8c7b90f 1505#ifdef PERL_OLD_COPY_ON_WRITE
bdd9a1b1 1506 RX_SAVED_COPY(rx) = NULL;
ed252734
NC
1507#endif
1508 }
07bc277f 1509 RX_SUBLEN(rx) = strend - t;
14977893 1510 RX_MATCH_COPIED_on(rx);
07bc277f
NC
1511 off = RX_OFFS(rx)[0].start = s - t;
1512 RX_OFFS(rx)[0].end = off + RX_MINLENRET(rx);
14977893
JH
1513 }
1514 else { /* startp/endp are used by @- @+. */
07bc277f
NC
1515 RX_OFFS(rx)[0].start = s - truebase;
1516 RX_OFFS(rx)[0].end = s - truebase + RX_MINLENRET(rx);
14977893 1517 }
7e1a2c8d
DM
1518 /* match via INTUIT shouldn't have any captures. Let @-, @+, $^N know */
1519 assert(!RX_NPARENS(rx));
1520 RX_LASTPAREN(rx) = RX_LASTCLOSEPAREN(rx) = 0;
4633a7c4 1521 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1522 RETPUSHYES;
1523
1524nope:
a0d0e21e 1525ret_no:
d65afb4b 1526 if (global && !(dynpm->op_pmflags & PMf_CONTINUE)) {
a0d0e21e 1527 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
6136c704 1528 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1529 if (mg)
565764a8 1530 mg->mg_len = -1;
a0d0e21e
LW
1531 }
1532 }
4633a7c4 1533 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1534 if (gimme == G_ARRAY)
1535 RETURN;
1536 RETPUSHNO;
1537}
1538
1539OP *
864dbfa3 1540Perl_do_readline(pTHX)
a0d0e21e 1541{
27da23d5 1542 dVAR; dSP; dTARGETSTACKED;
eb578fdb 1543 SV *sv;
a0d0e21e
LW
1544 STRLEN tmplen = 0;
1545 STRLEN offset;
760ac839 1546 PerlIO *fp;
eb578fdb
KW
1547 IO * const io = GvIO(PL_last_in_gv);
1548 const I32 type = PL_op->op_type;
a3b680e6 1549 const I32 gimme = GIMME_V;
a0d0e21e 1550
6136c704 1551 if (io) {
50db69d8 1552 const MAGIC *const mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar);
6136c704 1553 if (mg) {
50db69d8 1554 Perl_tied_method(aTHX_ "READLINE", SP, MUTABLE_SV(io), mg, gimme, 0);
6136c704 1555 if (gimme == G_SCALAR) {
50db69d8
NC
1556 SPAGAIN;
1557 SvSetSV_nosteal(TARG, TOPs);
1558 SETTARG;
6136c704 1559 }
50db69d8 1560 return NORMAL;
0b7c7b4f 1561 }
e79b0511 1562 }
4608196e 1563 fp = NULL;
a0d0e21e
LW
1564 if (io) {
1565 fp = IoIFP(io);
1566 if (!fp) {
1567 if (IoFLAGS(io) & IOf_ARGV) {
1568 if (IoFLAGS(io) & IOf_START) {
a0d0e21e 1569 IoLINES(io) = 0;
3280af22 1570 if (av_len(GvAVn(PL_last_in_gv)) < 0) {
1d7c1841 1571 IoFLAGS(io) &= ~IOf_START;
4608196e 1572 do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,NULL);
4bac9ae4 1573 SvTAINTED_off(GvSVn(PL_last_in_gv)); /* previous tainting irrelevant */
76f68e9b 1574 sv_setpvs(GvSVn(PL_last_in_gv), "-");
3280af22 1575 SvSETMAGIC(GvSV(PL_last_in_gv));
a2008d6d
GS
1576 fp = IoIFP(io);
1577 goto have_fp;
a0d0e21e
LW
1578 }
1579 }
3280af22 1580 fp = nextargv(PL_last_in_gv);
a0d0e21e 1581 if (!fp) { /* Note: fp != IoIFP(io) */
3280af22 1582 (void)do_close(PL_last_in_gv, FALSE); /* now it does*/
a0d0e21e
LW
1583 }
1584 }
0d44d22b
NC
1585 else if (type == OP_GLOB)
1586 fp = Perl_start_glob(aTHX_ POPs, io);
a0d0e21e
LW
1587 }
1588 else if (type == OP_GLOB)
1589 SP--;
7716c5c5 1590 else if (IoTYPE(io) == IoTYPE_WRONLY) {
a5390457 1591 report_wrongway_fh(PL_last_in_gv, '>');
a00b5bd3 1592 }
a0d0e21e
LW
1593 }
1594 if (!fp) {
041457d9
DM
1595 if ((!io || !(IoFLAGS(io) & IOf_START))
1596 && ckWARN2(WARN_GLOB, WARN_CLOSED))
1597 {
3f4520fe 1598 if (type == OP_GLOB)
63922903 1599 Perl_ck_warner_d(aTHX_ packWARN(WARN_GLOB),
af8c498a
GS
1600 "glob failed (can't start child: %s)",
1601 Strerror(errno));
69282e91 1602 else
831e4cc3 1603 report_evil_fh(PL_last_in_gv);
3f4520fe 1604 }
54310121 1605 if (gimme == G_SCALAR) {
79628082 1606 /* undef TARG, and push that undefined value */
ba92458f
AE
1607 if (type != OP_RCATLINE) {
1608 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1609 SvOK_off(TARG);
ba92458f 1610 }
a0d0e21e
LW
1611 PUSHTARG;
1612 }
1613 RETURN;
1614 }
a2008d6d 1615 have_fp:
54310121 1616 if (gimme == G_SCALAR) {
a0d0e21e 1617 sv = TARG;
0f722b55
RGS
1618 if (type == OP_RCATLINE && SvGMAGICAL(sv))
1619 mg_get(sv);
48de12d9
RGS
1620 if (SvROK(sv)) {
1621 if (type == OP_RCATLINE)
5668452f 1622 SvPV_force_nomg_nolen(sv);
48de12d9
RGS
1623 else
1624 sv_unref(sv);
1625 }
f7877b28 1626 else if (isGV_with_GP(sv)) {
5668452f 1627 SvPV_force_nomg_nolen(sv);
f7877b28 1628 }
862a34c6 1629 SvUPGRADE(sv, SVt_PV);
a0d0e21e 1630 tmplen = SvLEN(sv); /* remember if already alloced */
f72e8700
JJ
1631 if (!tmplen && !SvREADONLY(sv)) {
1632 /* try short-buffering it. Please update t/op/readline.t
1633 * if you change the growth length.
1634 */
1635 Sv_Grow(sv, 80);
1636 }
2b5e58c4
AMS
1637 offset = 0;
1638 if (type == OP_RCATLINE && SvOK(sv)) {
1639 if (!SvPOK(sv)) {
5668452f 1640 SvPV_force_nomg_nolen(sv);
2b5e58c4 1641 }
a0d0e21e 1642 offset = SvCUR(sv);
2b5e58c4 1643 }
a0d0e21e 1644 }
54310121 1645 else {
561b68a9 1646 sv = sv_2mortal(newSV(80));
54310121
PP
1647 offset = 0;
1648 }
fbad3eb5 1649
3887d568
AP
1650 /* This should not be marked tainted if the fp is marked clean */
1651#define MAYBE_TAINT_LINE(io, sv) \
1652 if (!(IoFLAGS(io) & IOf_UNTAINT)) { \
1653 TAINT; \
1654 SvTAINTED_on(sv); \
1655 }
1656
684bef36 1657/* delay EOF state for a snarfed empty file */
fbad3eb5 1658#define SNARF_EOF(gimme,rs,io,sv) \
684bef36 1659 (gimme != G_SCALAR || SvCUR(sv) \
b9fee9ba 1660 || (IoFLAGS(io) & IOf_NOLINE) || !RsSNARF(rs))
fbad3eb5 1661
a0d0e21e 1662 for (;;) {
09e8efcc 1663 PUTBACK;
fbad3eb5 1664 if (!sv_gets(sv, fp, offset)
2d726892
TF
1665 && (type == OP_GLOB
1666 || SNARF_EOF(gimme, PL_rs, io, sv)
1667 || PerlIO_error(fp)))
fbad3eb5 1668 {
760ac839 1669 PerlIO_clearerr(fp);
a0d0e21e 1670 if (IoFLAGS(io) & IOf_ARGV) {
3280af22 1671 fp = nextargv(PL_last_in_gv);
a0d0e21e
LW
1672 if (fp)
1673 continue;
3280af22 1674 (void)do_close(PL_last_in_gv, FALSE);
a0d0e21e
LW
1675 }
1676 else if (type == OP_GLOB) {
a2a5de95
NC
1677 if (!do_close(PL_last_in_gv, FALSE)) {
1678 Perl_ck_warner(aTHX_ packWARN(WARN_GLOB),
1679 "glob failed (child exited with status %d%s)",
1680 (int)(STATUS_CURRENT >> 8),
1681 (STATUS_CURRENT & 0x80) ? ", core dumped" : "");
4eb79ab5 1682 }
a0d0e21e 1683 }
54310121 1684 if (gimme == G_SCALAR) {
ba92458f
AE
1685 if (type != OP_RCATLINE) {
1686 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1687 SvOK_off(TARG);
ba92458f 1688 }
09e8efcc 1689 SPAGAIN;
a0d0e21e
LW
1690 PUSHTARG;
1691 }
3887d568 1692 MAYBE_TAINT_LINE(io, sv);
a0d0e21e
LW
1693 RETURN;
1694 }
3887d568 1695 MAYBE_TAINT_LINE(io, sv);
a0d0e21e 1696 IoLINES(io)++;
b9fee9ba 1697 IoFLAGS(io) |= IOf_NOLINE;
71be2cbc 1698 SvSETMAGIC(sv);
09e8efcc 1699 SPAGAIN;
a0d0e21e 1700 XPUSHs(sv);
a0d0e21e 1701 if (type == OP_GLOB) {
349d4f2f 1702 const char *t1;
a0d0e21e 1703
3280af22 1704 if (SvCUR(sv) > 0 && SvCUR(PL_rs) > 0) {
6136c704 1705 char * const tmps = SvEND(sv) - 1;
aa07b2f6 1706 if (*tmps == *SvPVX_const(PL_rs)) {
c07a80fd 1707 *tmps = '\0';
b162af07 1708 SvCUR_set(sv, SvCUR(sv) - 1);
c07a80fd
PP
1709 }
1710 }
349d4f2f 1711 for (t1 = SvPVX_const(sv); *t1; t1++)
937b2e03 1712 if (!isALNUMC(*t1) &&
349d4f2f 1713 strchr("$&*(){}[]'\";\\|?<>~`", *t1))
a0d0e21e 1714 break;
349d4f2f 1715 if (*t1 && PerlLIO_lstat(SvPVX_const(sv), &PL_statbuf) < 0) {
a0d0e21e
LW
1716 (void)POPs; /* Unmatched wildcard? Chuck it... */
1717 continue;
1718 }
2d79bf7f 1719 } else if (SvUTF8(sv)) { /* OP_READLINE, OP_RCATLINE */
d4c19fe8
AL
1720 if (ckWARN(WARN_UTF8)) {
1721 const U8 * const s = (const U8*)SvPVX_const(sv) + offset;
1722 const STRLEN len = SvCUR(sv) - offset;
1723 const U8 *f;
1724
1725 if (!is_utf8_string_loc(s, len, &f))
1726 /* Emulate :encoding(utf8) warning in the same case. */
1727 Perl_warner(aTHX_ packWARN(WARN_UTF8),
1728 "utf8 \"\\x%02X\" does not map to Unicode",
1729 f < (U8*)SvEND(sv) ? *f : 0);
1730 }
a0d0e21e 1731 }
54310121 1732 if (gimme == G_ARRAY) {
a0d0e21e 1733 if (SvLEN(sv) - SvCUR(sv) > 20) {
1da4ca5f 1734 SvPV_shrink_to_cur(sv);
a0d0e21e 1735 }
561b68a9 1736 sv = sv_2mortal(newSV(80));
a0d0e21e
LW
1737 continue;
1738 }
54310121 1739 else if (gimme == G_SCALAR && !tmplen && SvLEN(sv) - SvCUR(sv) > 80) {
a0d0e21e 1740 /* try to reclaim a bit of scalar space (only on 1st alloc) */
d5b5861b
NC
1741 const STRLEN new_len
1742 = SvCUR(sv) < 60 ? 80 : SvCUR(sv)+40; /* allow some slop */
1da4ca5f 1743 SvPV_renew(sv, new_len);
a0d0e21e
LW
1744 }
1745 RETURN;
1746 }
1747}
1748
a0d0e21e
LW
1749PP(pp_helem)
1750{
97aff369 1751 dVAR; dSP;
760ac839 1752 HE* he;
ae77835f 1753 SV **svp;
c445ea15 1754 SV * const keysv = POPs;
85fbaab2 1755 HV * const hv = MUTABLE_HV(POPs);
a3b680e6
AL
1756 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
1757 const U32 defer = PL_op->op_private & OPpLVAL_DEFER;
be6c24e0 1758 SV *sv;
c158a4fd 1759 const U32 hash = (SvIsCOW_shared_hash(keysv)) ? SvSHARED_HASH(keysv) : 0;
92970b93 1760 const bool localizing = PL_op->op_private & OPpLVAL_INTRO;
d30e492c 1761 bool preeminent = TRUE;
a0d0e21e 1762
d4c19fe8 1763 if (SvTYPE(hv) != SVt_PVHV)
a0d0e21e 1764 RETPUSHUNDEF;
d4c19fe8 1765
92970b93 1766 if (localizing) {
d4c19fe8
AL
1767 MAGIC *mg;
1768 HV *stash;
d30e492c
VP
1769
1770 /* If we can determine whether the element exist,
1771 * Try to preserve the existenceness of a tied hash
1772 * element by using EXISTS and DELETE if possible.
1773 * Fallback to FETCH and STORE otherwise. */
2c5f48c2 1774 if (SvCANEXISTDELETE(hv))
d30e492c 1775 preeminent = hv_exists_ent(hv, keysv, 0);
d4c19fe8 1776 }
d30e492c 1777
d4c19fe8
AL
1778 he = hv_fetch_ent(hv, keysv, lval && !defer, hash);
1779 svp = he ? &HeVAL(he) : NULL;
a0d0e21e 1780 if (lval) {
746f6409 1781 if (!svp || !*svp || *svp == &PL_sv_undef) {
68dc0745
PP
1782 SV* lv;
1783 SV* key2;
2d8e6c8d 1784 if (!defer) {
be2597df 1785 DIE(aTHX_ PL_no_helem_sv, SVfARG(keysv));
2d8e6c8d 1786 }
68dc0745
PP
1787 lv = sv_newmortal();
1788 sv_upgrade(lv, SVt_PVLV);
1789 LvTYPE(lv) = 'y';
6136c704 1790 sv_magic(lv, key2 = newSVsv(keysv), PERL_MAGIC_defelem, NULL, 0);
68dc0745 1791 SvREFCNT_dec(key2); /* sv_magic() increments refcount */
b37c2d43 1792 LvTARG(lv) = SvREFCNT_inc_simple(hv);
68dc0745
PP
1793 LvTARGLEN(lv) = 1;
1794 PUSHs(lv);
1795 RETURN;
1796 }
92970b93 1797 if (localizing) {
bfcb3514 1798 if (HvNAME_get(hv) && isGV(*svp))
159b6efe 1799 save_gp(MUTABLE_GV(*svp), !(PL_op->op_flags & OPf_SPECIAL));
47cfc530
VP
1800 else if (preeminent)
1801 save_helem_flags(hv, keysv, svp,
1802 (PL_op->op_flags & OPf_SPECIAL) ? 0 : SAVEf_SETMAGIC);
1803 else
1804 SAVEHDELETE(hv, keysv);
5f05dabc 1805 }
9026059d
GG
1806 else if (PL_op->op_private & OPpDEREF) {
1807 PUSHs(vivify_ref(*svp, PL_op->op_private & OPpDEREF));
1808 RETURN;
1809 }
a0d0e21e 1810 }
746f6409 1811 sv = (svp && *svp ? *svp : &PL_sv_undef);
fd69380d
DM
1812 /* Originally this did a conditional C<sv = sv_mortalcopy(sv)>; this
1813 * was to make C<local $tied{foo} = $tied{foo}> possible.
1814 * However, it seems no longer to be needed for that purpose, and
1815 * introduced a new bug: stuff like C<while ($hash{taintedval} =~ /.../g>
1816 * would loop endlessly since the pos magic is getting set on the
1817 * mortal copy and lost. However, the copy has the effect of
1818 * triggering the get magic, and losing it altogether made things like
1819 * c<$tied{foo};> in void context no longer do get magic, which some
1820 * code relied on. Also, delayed triggering of magic on @+ and friends
1821 * meant the original regex may be out of scope by now. So as a
1822 * compromise, do the get magic here. (The MGf_GSKIP flag will stop it
1823 * being called too many times). */
39cf747a 1824 if (!lval && SvRMAGICAL(hv) && SvGMAGICAL(sv))
fd69380d 1825 mg_get(sv);
be6c24e0 1826 PUSHs(sv);
a0d0e21e
LW
1827 RETURN;
1828}
1829
a0d0e21e
LW
1830PP(pp_iter)
1831{
97aff369 1832 dVAR; dSP;
eb578fdb 1833 PERL_CONTEXT *cx;
dc09a129 1834 SV *sv, *oldsv;
1d7c1841 1835 SV **itersvp;
d01136d6
BS
1836 AV *av = NULL; /* used for LOOP_FOR on arrays and the stack */
1837 bool av_is_stack = FALSE;
a0d0e21e 1838
924508f0 1839 EXTEND(SP, 1);
a0d0e21e 1840 cx = &cxstack[cxstack_ix];
3b719c58 1841 if (!CxTYPE_is_LOOP(cx))
5637ef5b 1842 DIE(aTHX_ "panic: pp_iter, type=%u", CxTYPE(cx));
a0d0e21e 1843
1d7c1841 1844 itersvp = CxITERVAR(cx);
d01136d6 1845 if (CxTYPE(cx) == CXt_LOOP_LAZYSV) {
89ea2908 1846 /* string increment */
d01136d6
BS
1847 SV* cur = cx->blk_loop.state_u.lazysv.cur;
1848 SV *end = cx->blk_loop.state_u.lazysv.end;
267cc4a8
NC
1849 /* If the maximum is !SvOK(), pp_enteriter substitutes PL_sv_no.
1850 It has SvPVX of "" and SvCUR of 0, which is what we want. */
4fe3f0fa 1851 STRLEN maxlen = 0;
d01136d6 1852 const char *max = SvPV_const(end, maxlen);
89ea2908 1853 if (!SvNIOK(cur) && SvCUR(cur) <= maxlen) {
1d7c1841 1854 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1855 /* safe to reuse old SV */
1d7c1841 1856 sv_setsv(*itersvp, cur);
eaa5c2d6 1857 }
1c846c1f 1858 else
eaa5c2d6
GA
1859 {
1860 /* we need a fresh SV every time so that loop body sees a
1861 * completely new SV for closures/references to work as
1862 * they used to */
dc09a129 1863 oldsv = *itersvp;
1d7c1841 1864 *itersvp = newSVsv(cur);
dc09a129 1865 SvREFCNT_dec(oldsv);
eaa5c2d6 1866 }
aa07b2f6 1867 if (strEQ(SvPVX_const(cur), max))
89ea2908
GA
1868 sv_setiv(cur, 0); /* terminate next time */
1869 else
1870 sv_inc(cur);
1871 RETPUSHYES;
1872 }
1873 RETPUSHNO;
d01136d6
BS
1874 }
1875 else if (CxTYPE(cx) == CXt_LOOP_LAZYIV) {
89ea2908 1876 /* integer increment */
d01136d6 1877 if (cx->blk_loop.state_u.lazyiv.cur > cx->blk_loop.state_u.lazyiv.end)
89ea2908 1878 RETPUSHNO;
7f61b687 1879
3db8f154 1880 /* don't risk potential race */
1d7c1841 1881 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1882 /* safe to reuse old SV */
cdc1aa42 1883 sv_setiv(*itersvp, cx->blk_loop.state_u.lazyiv.cur);
eaa5c2d6 1884 }
1c846c1f 1885 else
eaa5c2d6
GA
1886 {
1887 /* we need a fresh SV every time so that loop body sees a
1888 * completely new SV for closures/references to work as they
1889 * used to */
dc09a129 1890 oldsv = *itersvp;
cdc1aa42 1891 *itersvp = newSViv(cx->blk_loop.state_u.lazyiv.cur);
dc09a129 1892 SvREFCNT_dec(oldsv);
eaa5c2d6 1893 }
a2309040 1894
cdc1aa42
NC
1895 if (cx->blk_loop.state_u.lazyiv.cur == IV_MAX) {
1896 /* Handle end of range at IV_MAX */
1897 cx->blk_loop.state_u.lazyiv.end = IV_MIN;
1898 } else
1899 ++cx->blk_loop.state_u.lazyiv.cur;
a2309040 1900
89ea2908
GA
1901 RETPUSHYES;
1902 }
1903
1904 /* iterate array */
d01136d6
BS
1905 assert(CxTYPE(cx) == CXt_LOOP_FOR);
1906 av = cx->blk_loop.state_u.ary.ary;
1907 if (!av) {
1908 av_is_stack = TRUE;
1909 av = PL_curstack;
1910 }
ef3e5ea9 1911 if (PL_op->op_private & OPpITER_REVERSED) {
d01136d6
BS
1912 if (cx->blk_loop.state_u.ary.ix <= (av_is_stack
1913 ? cx->blk_loop.resetsp + 1 : 0))
ef3e5ea9 1914 RETPUSHNO;
a0d0e21e 1915
ef3e5ea9 1916 if (SvMAGICAL(av) || AvREIFY(av)) {
d01136d6 1917 SV * const * const svp = av_fetch(av, --cx->blk_loop.state_u.ary.ix, FALSE);
a0714e2c 1918 sv = svp ? *svp : NULL;
ef3e5ea9
NC
1919 }
1920 else {
d01136d6 1921 sv = AvARRAY(av)[--cx->blk_loop.state_u.ary.ix];
ef3e5ea9 1922 }
d42935ef
JH
1923 }
1924 else {
d01136d6 1925 if (cx->blk_loop.state_u.ary.ix >= (av_is_stack ? cx->blk_oldsp :
ef3e5ea9
NC
1926 AvFILL(av)))
1927 RETPUSHNO;
1928
1929 if (SvMAGICAL(av) || AvREIFY(av)) {
d01136d6 1930 SV * const * const svp = av_fetch(av, ++cx->blk_loop.state_u.ary.ix, FALSE);
a0714e2c 1931 sv = svp ? *svp : NULL;
ef3e5ea9
NC
1932 }
1933 else {
d01136d6 1934 sv = AvARRAY(av)[++cx->blk_loop.state_u.ary.ix];
ef3e5ea9 1935 }
d42935ef 1936 }
ef3e5ea9 1937
0565a181 1938 if (sv && SvIS_FREED(sv)) {
a0714e2c 1939 *itersvp = NULL;
b6c83531 1940 Perl_croak(aTHX_ "Use of freed value in iteration");
cccede53
DM
1941 }
1942
d01136d6 1943 if (sv) {
a0d0e21e 1944 SvTEMP_off(sv);
d01136d6
BS
1945 SvREFCNT_inc_simple_void_NN(sv);
1946 }
a0d0e21e 1947 else
3280af22 1948 sv = &PL_sv_undef;
d01136d6
BS
1949 if (!av_is_stack && sv == &PL_sv_undef) {
1950 SV *lv = newSV_type(SVt_PVLV);
1951 LvTYPE(lv) = 'y';
1952 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
b37c2d43 1953 LvTARG(lv) = SvREFCNT_inc_simple(av);
d01136d6 1954 LvTARGOFF(lv) = cx->blk_loop.state_u.ary.ix;
42718184 1955 LvTARGLEN(lv) = (STRLEN)UV_MAX;
d01136d6 1956 sv = lv;
5f05dabc 1957 }
a0d0e21e 1958
dc09a129 1959 oldsv = *itersvp;
d01136d6 1960 *itersvp = sv;
dc09a129
DM
1961 SvREFCNT_dec(oldsv);
1962
a0d0e21e
LW
1963 RETPUSHYES;
1964}
1965
ef07e810
DM
1966/*
1967A description of how taint works in pattern matching and substitution.
1968
4e19c54b 1969While the pattern is being assembled/concatenated and then compiled,
0ab462a6
DM
1970PL_tainted will get set if any component of the pattern is tainted, e.g.
1971/.*$tainted/. At the end of pattern compilation, the RXf_TAINTED flag
1972is set on the pattern if PL_tainted is set.
ef07e810 1973
0ab462a6
DM
1974When the pattern is copied, e.g. $r = qr/..../, the SV holding the ref to
1975the pattern is marked as tainted. This means that subsequent usage, such
1976as /x$r/, will set PL_tainted, and thus RXf_TAINTED, on the new pattern too.
ef07e810
DM
1977
1978During execution of a pattern, locale-variant ops such as ALNUML set the
1979local flag RF_tainted. At the end of execution, the engine sets the
0ab462a6
DM
1980RXf_TAINTED_SEEN on the pattern if RF_tainted got set, or clears it
1981otherwise.
ef07e810
DM
1982
1983In addition, RXf_TAINTED_SEEN is used post-execution by the get magic code
1984of $1 et al to indicate whether the returned value should be tainted.
1985It is the responsibility of the caller of the pattern (i.e. pp_match,
1986pp_subst etc) to set this flag for any other circumstances where $1 needs
1987to be tainted.
1988
1989The taint behaviour of pp_subst (and pp_substcont) is quite complex.
1990
1991There are three possible sources of taint
1992 * the source string
1993 * the pattern (both compile- and run-time, RXf_TAINTED / RXf_TAINTED_SEEN)
1994 * the replacement string (or expression under /e)
1995
1996There are four destinations of taint and they are affected by the sources
1997according to the rules below:
1998
1999 * the return value (not including /r):
2000 tainted by the source string and pattern, but only for the
2001 number-of-iterations case; boolean returns aren't tainted;
2002 * the modified string (or modified copy under /r):
2003 tainted by the source string, pattern, and replacement strings;
2004 * $1 et al:
2005 tainted by the pattern, and under 'use re "taint"', by the source
2006 string too;
2007 * PL_taint - i.e. whether subsequent code (e.g. in a /e block) is tainted:
2008 should always be unset before executing subsequent code.
2009
2010The overall action of pp_subst is:
2011
2012 * at the start, set bits in rxtainted indicating the taint status of
2013 the various sources.
2014
2015 * After each pattern execution, update the SUBST_TAINT_PAT bit in
2016 rxtainted if RXf_TAINTED_SEEN has been set, to indicate that the
2017 pattern has subsequently become tainted via locale ops.
2018
2019 * If control is being passed to pp_substcont to execute a /e block,
2020 save rxtainted in the CXt_SUBST block, for future use by
2021 pp_substcont.
2022
2023 * Whenever control is being returned to perl code (either by falling
2024 off the "end" of pp_subst/pp_substcont, or by entering a /e block),
2025 use the flag bits in rxtainted to make all the appropriate types of
0ab462a6
DM
2026 destination taint visible; e.g. set RXf_TAINTED_SEEN so that $1
2027 et al will appear tainted.
ef07e810
DM
2028
2029pp_match is just a simpler version of the above.
2030
2031*/
2032
a0d0e21e
LW
2033PP(pp_subst)
2034{
97aff369 2035 dVAR; dSP; dTARG;
eb578fdb 2036 PMOP *pm = cPMOP;
a0d0e21e 2037 PMOP *rpm = pm;
eb578fdb 2038 char *s;
a0d0e21e 2039 char *strend;
eb578fdb 2040 char *m;
5c144d81 2041 const char *c;
eb578fdb 2042 char *d;
a0d0e21e
LW
2043 STRLEN clen;
2044 I32 iters = 0;
2045 I32 maxiters;
eb578fdb 2046 I32 i;
a0d0e21e 2047 bool once;
ef07e810
DM
2048 U8 rxtainted = 0; /* holds various SUBST_TAINT_* flag bits.
2049 See "how taint works" above */
a0d0e21e 2050 char *orig;
1ed74d04 2051 U8 r_flags;
eb578fdb 2052 REGEXP *rx = PM_GETRE(pm);
a0d0e21e
LW
2053 STRLEN len;
2054 int force_on_match = 0;
0bcc34c2 2055 const I32 oldsave = PL_savestack_ix;
792b2c16 2056 STRLEN slen;
f272994b 2057 bool doutf8 = FALSE;
f8c7b90f 2058#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2059 bool is_cow;
2060#endif
a0714e2c 2061 SV *nsv = NULL;
b770e143 2062 /* known replacement string? */
eb578fdb 2063 SV *dstr = (pm->op_pmflags & PMf_CONST) ? POPs : NULL;
a0d0e21e 2064
f410a211
NC
2065 PERL_ASYNC_CHECK();
2066
533c011a 2067 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 2068 TARG = POPs;
59f00321
RGS
2069 else if (PL_op->op_private & OPpTARGET_MY)
2070 GETTARGET;
a0d0e21e 2071 else {
54b9620d 2072 TARG = DEFSV;
a0d0e21e 2073 EXTEND(SP,1);
1c846c1f 2074 }
d9f424b2 2075
f8c7b90f 2076#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2077 /* Awooga. Awooga. "bool" types that are actually char are dangerous,
2078 because they make integers such as 256 "false". */
2079 is_cow = SvIsCOW(TARG) ? TRUE : FALSE;
2080#else
765f542d
NC
2081 if (SvIsCOW(TARG))
2082 sv_force_normal_flags(TARG,0);
ed252734 2083#endif
8ca8a454 2084 if (!(rpm->op_pmflags & PMf_NONDESTRUCT)
f8c7b90f 2085#ifdef PERL_OLD_COPY_ON_WRITE
8ca8a454 2086 && !is_cow
ed252734 2087#endif
8ca8a454
NC
2088 && (SvREADONLY(TARG)
2089 || ( ((SvTYPE(TARG) == SVt_PVGV && isGV_with_GP(TARG))
2090 || SvTYPE(TARG) > SVt_PVLV)
2091 && !(SvTYPE(TARG) == SVt_PVGV && SvFAKE(TARG)))))
6ad8f254 2092 Perl_croak_no_modify(aTHX);
8ec5e241
NIS
2093 PUTBACK;
2094
3e462cdc 2095 setup_match:
d5263905 2096 s = SvPV_mutable(TARG, len);
4499db73 2097 if (!SvPOKp(TARG) || SvTYPE(TARG) == SVt_PVGV || SvVOK(TARG))
a0d0e21e 2098 force_on_match = 1;
20be6587
DM
2099
2100 /* only replace once? */
2101 once = !(rpm->op_pmflags & PMf_GLOBAL);
2102
ef07e810 2103 /* See "how taint works" above */
20be6587
DM
2104 if (PL_tainting) {
2105 rxtainted = (
2106 (SvTAINTED(TARG) ? SUBST_TAINT_STR : 0)
2107 | ((RX_EXTFLAGS(rx) & RXf_TAINTED) ? SUBST_TAINT_PAT : 0)
2108 | ((pm->op_pmflags & PMf_RETAINT) ? SUBST_TAINT_RETAINT : 0)
2109 | ((once && !(rpm->op_pmflags & PMf_NONDESTRUCT))
2110 ? SUBST_TAINT_BOOLRET : 0));
2111 TAINT_NOT;
2112 }
a12c0f56 2113
a30b2f1f 2114 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 2115
a0d0e21e
LW
2116 force_it:
2117 if (!pm || !s)
5637ef5b 2118 DIE(aTHX_ "panic: pp_subst, pm=%p, s=%p", pm, s);
a0d0e21e
LW
2119
2120 strend = s + len;
a30b2f1f 2121 slen = RX_MATCH_UTF8(rx) ? utf8_length((U8*)s, (U8*)strend) : len;
792b2c16
JH
2122 maxiters = 2 * slen + 10; /* We can match twice at each
2123 position, once with zero-length,
2124 second time with non-zero. */
a0d0e21e 2125
220fc49f 2126 if (!RX_PRELEN(rx) && PL_curpm) {
3280af22 2127 pm = PL_curpm;
aaa362c4 2128 rx = PM_GETRE(pm);
a0d0e21e 2129 }
07bc277f
NC
2130 r_flags = (RX_NPARENS(rx) || SvTEMP(TARG) || PL_sawampersand
2131 || (RX_EXTFLAGS(rx) & (RXf_EVAL_SEEN|RXf_PMf_KEEPCOPY)) )
ed252734 2132 ? REXEC_COPY_STR : 0;
7fba1cd6 2133
a0d0e21e 2134 orig = m = s;
07bc277f 2135 if (RX_EXTFLAGS(rx) & RXf_USE_INTUIT) {
ee0b7718 2136 PL_bostr = orig;
f9f4320a 2137 s = CALLREG_INTUIT_START(rx, TARG, s, strend, r_flags, NULL);
f722798b
IZ
2138
2139 if (!s)
df34c13a 2140 goto ret_no;
f722798b 2141 /* How to do it in subst? */
07bc277f 2142/* if ( (RX_EXTFLAGS(rx) & RXf_CHECK_ALL)
1c846c1f 2143 && !PL_sawampersand
a91cc451 2144 && !(RX_EXTFLAGS(rx) & RXf_KEEPCOPY))
f722798b
IZ
2145 goto yup;
2146*/
a0d0e21e 2147 }
71be2cbc 2148
8b64c330
DM
2149 if (!CALLREGEXEC(rx, s, strend, orig, 0, TARG, NULL,
2150 r_flags | REXEC_CHECKED))
2151 {
5e79dfb9
DM
2152 ret_no:
2153 SPAGAIN;
2154 PUSHs(rpm->op_pmflags & PMf_NONDESTRUCT ? TARG : &PL_sv_no);
2155 LEAVE_SCOPE(oldsave);
2156 RETURN;
2157 }
2158
71be2cbc 2159 /* known replacement string? */
f272994b 2160 if (dstr) {
20be6587
DM
2161 if (SvTAINTED(dstr))
2162 rxtainted |= SUBST_TAINT_REPL;
3e462cdc
KW
2163
2164 /* Upgrade the source if the replacement is utf8 but the source is not,
2165 * but only if it matched; see
2166 * http://www.nntp.perl.org/group/perl.perl5.porters/2010/04/msg158809.html
2167 */
5e79dfb9 2168 if (DO_UTF8(dstr) && ! DO_UTF8(TARG)) {
c95ca9b8
DM
2169 char * const orig_pvx = SvPVX(TARG);
2170 const STRLEN new_len = sv_utf8_upgrade_nomg(TARG);
3e462cdc
KW
2171
2172 /* If the lengths are the same, the pattern contains only
2173 * invariants, can keep going; otherwise, various internal markers
2174 * could be off, so redo */
c95ca9b8 2175 if (new_len != len || orig_pvx != SvPVX(TARG)) {
3e462cdc
KW
2176 goto setup_match;
2177 }
2178 }
2179
8514a05a
JH
2180 /* replacement needing upgrading? */
2181 if (DO_UTF8(TARG) && !doutf8) {
db79b45b 2182 nsv = sv_newmortal();
4a176938 2183 SvSetSV(nsv, dstr);
8514a05a
JH
2184 if (PL_encoding)
2185 sv_recode_to_utf8(nsv, PL_encoding);
2186 else
2187 sv_utf8_upgrade(nsv);
5c144d81 2188 c = SvPV_const(nsv, clen);
4a176938
JH
2189 doutf8 = TRUE;
2190 }
2191 else {
5c144d81 2192 c = SvPV_const(dstr, clen);
4a176938 2193 doutf8 = DO_UTF8(dstr);
8514a05a 2194 }
f272994b
A
2195 }
2196 else {
6136c704 2197 c = NULL;
f272994b
A
2198 doutf8 = FALSE;
2199 }
2200
71be2cbc 2201 /* can do inplace substitution? */
ed252734 2202 if (c
f8c7b90f 2203#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2204 && !is_cow
2205#endif
07bc277f
NC
2206 && (I32)clen <= RX_MINLENRET(rx) && (once || !(r_flags & REXEC_COPY_STR))
2207 && !(RX_EXTFLAGS(rx) & RXf_LOOKBEHIND_SEEN)
8ca8a454
NC
2208 && (!doutf8 || SvUTF8(TARG))
2209 && !(rpm->op_pmflags & PMf_NONDESTRUCT))
8b030b38 2210 {
ec911639 2211
f8c7b90f 2212#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2213 if (SvIsCOW(TARG)) {
2214 assert (!force_on_match);
2215 goto have_a_cow;
2216 }
2217#endif
71be2cbc
PP
2218 if (force_on_match) {
2219 force_on_match = 0;
2220 s = SvPV_force(TARG, len);
2221 goto force_it;
2222 }
71be2cbc 2223 d = s;
3280af22 2224 PL_curpm = pm;
71be2cbc 2225 if (once) {
20be6587
DM
2226 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2227 rxtainted |= SUBST_TAINT_PAT;
07bc277f
NC
2228 m = orig + RX_OFFS(rx)[0].start;
2229 d = orig + RX_OFFS(rx)[0].end;
71be2cbc
PP
2230 s = orig;
2231 if (m - s > strend - d) { /* faster to shorten from end */
2232 if (clen) {
2233 Copy(c, m, clen, char);
2234 m += clen;
a0d0e21e 2235 }
71be2cbc
PP
2236 i = strend - d;
2237 if (i > 0) {
2238 Move(d, m, i, char);
2239 m += i;
a0d0e21e 2240 }
71be2cbc
PP
2241 *m = '\0';
2242 SvCUR_set(TARG, m - s);
2243 }
155aba94 2244 else if ((i = m - s)) { /* faster from front */
71be2cbc
PP
2245 d -= clen;
2246 m = d;
0d3c21b0 2247 Move(s, d - i, i, char);
71be2cbc 2248 sv_chop(TARG, d-i);
71be2cbc
PP
2249 if (clen)
2250 Copy(c, m, clen, char);
2251 }
2252 else if (clen) {
2253 d -= clen;
2254 sv_chop(TARG, d);
2255 Copy(c, d, clen, char);
2256 }
2257 else {
2258 sv_chop(TARG, d);
2259 }
8ec5e241 2260 SPAGAIN;
8ca8a454 2261 PUSHs(&PL_sv_yes);
71be2cbc
PP
2262 }
2263 else {
71be2cbc
PP
2264 do {
2265 if (iters++ > maxiters)
cea2e8a9 2266 DIE(aTHX_ "Substitution loop");
20be6587
DM
2267 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2268 rxtainted |= SUBST_TAINT_PAT;
07bc277f 2269 m = RX_OFFS(rx)[0].start + orig;
155aba94 2270 if ((i = m - s)) {
71be2cbc
PP
2271 if (s != d)
2272 Move(s, d, i, char);
2273 d += i;
a0d0e21e 2274 }
71be2cbc
PP
2275 if (clen) {
2276 Copy(c, d, clen, char);
2277 d += clen;
2278 }
07bc277f 2279 s = RX_OFFS(rx)[0].end + orig;
f9f4320a 2280 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
f722798b
IZ
2281 TARG, NULL,
2282 /* don't match same null twice */
2283 REXEC_NOT_FIRST|REXEC_IGNOREPOS));
71be2cbc
PP
2284 if (s != d) {
2285 i = strend - s;
aa07b2f6 2286 SvCUR_set(TARG, d - SvPVX_const(TARG) + i);
71be2cbc 2287 Move(s, d, i+1, char); /* include the NUL */
a0d0e21e 2288 }
8ec5e241 2289 SPAGAIN;
8ca8a454 2290 mPUSHi((I32)iters);
a0d0e21e
LW
2291 }
2292 }
ff6e92e8 2293 else {
a0d0e21e
LW
2294 if (force_on_match) {
2295 force_on_match = 0;
0c1438a1
NC
2296 if (rpm->op_pmflags & PMf_NONDESTRUCT) {
2297 /* I feel that it should be possible to avoid this mortal copy
2298 given that the code below copies into a new destination.
2299 However, I suspect it isn't worth the complexity of
2300 unravelling the C<goto force_it> for the small number of
2301 cases where it would be viable to drop into the copy code. */
2302 TARG = sv_2mortal(newSVsv(TARG));
2303 }
a0d0e21e
LW
2304 s = SvPV_force(TARG, len);
2305 goto force_it;
2306 }
f8c7b90f 2307#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2308 have_a_cow:
2309#endif
20be6587
DM
2310 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2311 rxtainted |= SUBST_TAINT_PAT;
815dd406 2312 dstr = newSVpvn_flags(m, s-m, SVs_TEMP | (DO_UTF8(TARG) ? SVf_UTF8 : 0));
3280af22 2313 PL_curpm = pm;
a0d0e21e 2314 if (!c) {
eb578fdb 2315 PERL_CONTEXT *cx;
8ec5e241 2316 SPAGAIN;
20be6587
DM
2317 /* note that a whole bunch of local vars are saved here for
2318 * use by pp_substcont: here's a list of them in case you're
2319 * searching for places in this sub that uses a particular var:
2320 * iters maxiters r_flags oldsave rxtainted orig dstr targ
2321 * s m strend rx once */
a0d0e21e 2322 PUSHSUBST(cx);
20e98b0f 2323 RETURNOP(cPMOP->op_pmreplrootu.op_pmreplroot);
a0d0e21e 2324 }
cf93c79d 2325 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
2326 do {
2327 if (iters++ > maxiters)
cea2e8a9 2328 DIE(aTHX_ "Substitution loop");
20be6587
DM
2329 if (RX_MATCH_TAINTED(rx))
2330 rxtainted |= SUBST_TAINT_PAT;
07bc277f 2331 if (RX_MATCH_COPIED(rx) && RX_SUBBEG(rx) != orig) {
a0d0e21e
LW
2332 m = s;
2333 s = orig;
07bc277f 2334 orig = RX_SUBBEG(rx);
a0d0e21e
LW
2335 s = orig + (m - s);
2336 strend = s + (strend - m);
2337 }
07bc277f 2338 m = RX_OFFS(rx)[0].start + orig;
db79b45b 2339 if (doutf8 && !SvUTF8(dstr))
4bac9ae4 2340 sv_catpvn_nomg_utf8_upgrade(dstr, s, m - s, nsv);
db79b45b 2341 else
4bac9ae4 2342 sv_catpvn_nomg(dstr, s, m-s);
07bc277f 2343 s = RX_OFFS(rx)[0].end + orig;
a0d0e21e 2344 if (clen)
4bac9ae4 2345 sv_catpvn_nomg(dstr, c, clen);
a0d0e21e
LW
2346 if (once)
2347 break;
f9f4320a 2348 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
ffc61ed2 2349 TARG, NULL, r_flags));
db79b45b 2350 if (doutf8 && !DO_UTF8(TARG))
4bac9ae4 2351 sv_catpvn_nomg_utf8_upgrade(dstr, s, strend - s, nsv);
89afcb60 2352 else
4bac9ae4 2353 sv_catpvn_nomg(dstr, s, strend - s);
748a9306 2354
8ca8a454
NC
2355 if (rpm->op_pmflags & PMf_NONDESTRUCT) {
2356 /* From here on down we're using the copy, and leaving the original
2357 untouched. */
2358 TARG = dstr;
2359 SPAGAIN;
2360 PUSHs(dstr);
2361 } else {
f8c7b90f 2362#ifdef PERL_OLD_COPY_ON_WRITE
8ca8a454
NC
2363 /* The match may make the string COW. If so, brilliant, because
2364 that's just saved us one malloc, copy and free - the regexp has
2365 donated the old buffer, and we malloc an entirely new one, rather
2366 than the regexp malloc()ing a buffer and copying our original,
2367 only for us to throw it away here during the substitution. */
2368 if (SvIsCOW(TARG)) {
2369 sv_force_normal_flags(TARG, SV_COW_DROP_PV);
2370 } else
ed252734 2371#endif
8ca8a454
NC
2372 {
2373 SvPV_free(TARG);
2374 }
2375 SvPV_set(TARG, SvPVX(dstr));
2376 SvCUR_set(TARG, SvCUR(dstr));
2377 SvLEN_set(TARG, SvLEN(dstr));
2378 doutf8 |= DO_UTF8(dstr);
2379 SvPV_set(dstr, NULL);
748a9306 2380
8ca8a454 2381 SPAGAIN;
4f4d7508 2382 mPUSHi((I32)iters);
8ca8a454
NC
2383 }
2384 }
2385
2386 if (!(rpm->op_pmflags & PMf_NONDESTRUCT)) {
2387 (void)SvPOK_only_UTF8(TARG);
2388 if (doutf8)
2389 SvUTF8_on(TARG);
a0d0e21e 2390 }
20be6587 2391
ef07e810 2392 /* See "how taint works" above */
20be6587
DM
2393 if (PL_tainting) {
2394 if ((rxtainted & SUBST_TAINT_PAT) ||
2395 ((rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_RETAINT)) ==
2396 (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
2397 )
2398 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
2399
2400 if (!(rxtainted & SUBST_TAINT_BOOLRET)
2401 && (rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT))
2402 )
2403 SvTAINTED_on(TOPs); /* taint return value */
2404 else
2405 SvTAINTED_off(TOPs); /* may have got tainted earlier */
2406
2407 /* needed for mg_set below */
2408 PL_tainted =
2409 cBOOL(rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL));
2410 SvTAINT(TARG);
2411 }
2412 SvSETMAGIC(TARG); /* PL_tainted must be correctly set for this mg_set */
2413 TAINT_NOT;
f1a76097
DM
2414 LEAVE_SCOPE(oldsave);
2415 RETURN;
a0d0e21e
LW
2416}
2417
2418PP(pp_grepwhile)
2419{
27da23d5 2420 dVAR; dSP;
a0d0e21e
LW
2421
2422 if (SvTRUEx(POPs))
3280af22
NIS
2423 PL_stack_base[PL_markstack_ptr[-1]++] = PL_stack_base[*PL_markstack_ptr];
2424 ++*PL_markstack_ptr;
b2a2a901 2425 FREETMPS;
d343c3ef 2426 LEAVE_with_name("grep_item"); /* exit inner scope */
a0d0e21e
LW
2427
2428 /* All done yet? */
3280af22 2429 if (PL_stack_base + *PL_markstack_ptr > SP) {
a0d0e21e 2430 I32 items;
c4420975 2431 const I32 gimme = GIMME_V;
a0d0e21e 2432
d343c3ef 2433 LEAVE_with_name("grep"); /* exit outer scope */
a0d0e21e 2434 (void)POPMARK; /* pop src */
3280af22 2435 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 2436 (void)POPMARK; /* pop dst */
3280af22 2437 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 2438 if (gimme == G_SCALAR) {
7cc47870 2439 if (PL_op->op_private & OPpGREP_LEX) {
c4420975 2440 SV* const sv = sv_newmortal();
7cc47870
RGS
2441 sv_setiv(sv, items);
2442 PUSHs(sv);
2443 }
2444 else {
2445 dTARGET;
2446 XPUSHi(items);
2447 }
a0d0e21e 2448 }
54310121
PP
2449 else if (gimme == G_ARRAY)
2450 SP += items;
a0d0e21e
LW
2451 RETURN;
2452 }
2453 else {
2454 SV *src;
2455
d343c3ef 2456 ENTER_with_name("grep_item"); /* enter inner scope */
1d7c1841 2457 SAVEVPTR(PL_curpm);
a0d0e21e 2458
3280af22 2459 src = PL_stack_base[*PL_markstack_ptr];
a0d0e21e 2460 SvTEMP_off(src);
59f00321
RGS
2461 if (PL_op->op_private & OPpGREP_LEX)
2462 PAD_SVl(PL_op->op_targ) = src;
2463 else
414bf5ae 2464 DEFSV_set(src);
a0d0e21e
LW
2465
2466 RETURNOP(cLOGOP->op_other);
2467 }
2468}
2469
2470PP(pp_leavesub)
2471{
27da23d5 2472 dVAR; dSP;
a0d0e21e
LW
2473 SV **mark;
2474 SV **newsp;
2475 PMOP *newpm;
2476 I32 gimme;
eb578fdb 2477 PERL_CONTEXT *cx;
b0d9ce38 2478 SV *sv;
a0d0e21e 2479
9850bf21
RH
2480 if (CxMULTICALL(&cxstack[cxstack_ix]))
2481 return 0;
2482
a0d0e21e 2483 POPBLOCK(cx,newpm);
5dd42e15 2484 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2485
a1f49e72 2486 TAINT_NOT;
a0d0e21e
LW
2487 if (gimme == G_SCALAR) {
2488 MARK = newsp + 1;
a29cdaf0 2489 if (MARK <= SP) {
a8bba7fa 2490 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
6f48390a
FC
2491 if (SvTEMP(TOPs) && SvREFCNT(TOPs) == 1
2492 && !SvMAGICAL(TOPs)) {
a29cdaf0
IZ
2493 *MARK = SvREFCNT_inc(TOPs);
2494 FREETMPS;
2495 sv_2mortal(*MARK);
cd06dffe
GS
2496 }
2497 else {
959e3673 2498 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
a29cdaf0 2499 FREETMPS;
959e3673
GS
2500 *MARK = sv_mortalcopy(sv);
2501 SvREFCNT_dec(sv);
a29cdaf0 2502 }
cd06dffe 2503 }
6f48390a
FC
2504 else if (SvTEMP(TOPs) && SvREFCNT(TOPs) == 1
2505 && !SvMAGICAL(TOPs)) {
767eda44 2506 *MARK = TOPs;
767eda44 2507 }
cd06dffe 2508 else
767eda44 2509 *MARK = sv_mortalcopy(TOPs);
cd06dffe
GS
2510 }
2511 else {
f86702cc 2512 MEXTEND(MARK, 0);
3280af22 2513 *MARK = &PL_sv_undef;
a0d0e21e
LW
2514 }
2515 SP = MARK;
2516 }
54310121 2517 else if (gimme == G_ARRAY) {
f86702cc 2518 for (MARK = newsp + 1; MARK <= SP; MARK++) {
6f48390a
FC
2519 if (!SvTEMP(*MARK) || SvREFCNT(*MARK) != 1
2520 || SvMAGICAL(*MARK)) {
f86702cc 2521 *MARK = sv_mortalcopy(*MARK);
a1f49e72
CS
2522 TAINT_NOT; /* Each item is independent */
2523 }
f86702cc 2524 }
a0d0e21e 2525 }
f86702cc 2526 PUTBACK;
1c846c1f 2527
a57c6685 2528 LEAVE;
5dd42e15 2529 cxstack_ix--;
b0d9ce38 2530 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
3280af22 2531 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e 2532
b0d9ce38 2533 LEAVESUB(sv);
f39bc417 2534 return cx->blk_sub.retop;
a0d0e21e
LW
2535}
2536
2537PP(pp_entersub)
2538{
27da23d5 2539 dVAR; dSP; dPOPss;
a0d0e21e 2540 GV *gv;
eb578fdb
KW
2541 CV *cv;
2542 PERL_CONTEXT *cx;
5d94fbed 2543 I32 gimme;
a9c4fd4e 2544 const bool hasargs = (PL_op->op_flags & OPf_STACKED) != 0;
a0d0e21e
LW
2545
2546 if (!sv)
cea2e8a9 2547 DIE(aTHX_ "Not a CODE reference");
a0d0e21e 2548 switch (SvTYPE(sv)) {
f1025168
NC
2549 /* This is overwhelming the most common case: */
2550 case SVt_PVGV:
13be902c 2551 we_have_a_glob:
159b6efe 2552 if (!(cv = GvCVu((const GV *)sv))) {
f730a42d 2553 HV *stash;
f2c0649b 2554 cv = sv_2cv(sv, &stash, &gv, 0);
f730a42d 2555 }
f1025168 2556 if (!cv) {
a57c6685 2557 ENTER;
f1025168
NC
2558 SAVETMPS;
2559 goto try_autoload;
2560 }
2561 break;
13be902c
FC
2562 case SVt_PVLV:
2563 if(isGV_with_GP(sv)) goto we_have_a_glob;
2564 /*FALLTHROUGH*/
a0d0e21e 2565 default:
7c75014e
DM
2566 if (sv == &PL_sv_yes) { /* unfound import, ignore */
2567 if (hasargs)
2568 SP = PL_stack_base + POPMARK;
4d198de3
DM
2569 else
2570 (void)POPMARK;
7c75014e
DM
2571 RETURN;
2572 }
2573 SvGETMAGIC(sv);
2574 if (SvROK(sv)) {
93d7320b
DM
2575 if (SvAMAGIC(sv)) {
2576 sv = amagic_deref_call(sv, to_cv_amg);
2577 /* Don't SPAGAIN here. */
2578 }
7c75014e
DM
2579 }
2580 else {
a9c4fd4e 2581 const char *sym;
780a5241 2582 STRLEN len;
79a3e5ea 2583 if (!SvOK(sv))
cea2e8a9 2584 DIE(aTHX_ PL_no_usym, "a subroutine");
79a3e5ea 2585 sym = SvPV_nomg_const(sv, len);
533c011a 2586 if (PL_op->op_private & HINT_STRICT_REFS)
b375e37b 2587 DIE(aTHX_ "Can't use string (\"%" SVf32 "\"%s) as a subroutine ref while \"strict refs\" in use", sv, len>32 ? "..." : "");
780a5241 2588 cv = get_cvn_flags(sym, len, GV_ADD|SvUTF8(sv));
a0d0e21e
LW
2589 break;
2590 }
ea726b52 2591 cv = MUTABLE_CV(SvRV(sv));
a0d0e21e
LW
2592 if (SvTYPE(cv) == SVt_PVCV)
2593 break;
2594 /* FALL THROUGH */
2595 case SVt_PVHV:
2596 case SVt_PVAV:
cea2e8a9 2597 DIE(aTHX_ "Not a CODE reference");
f1025168 2598 /* This is the second most common case: */
a0d0e21e 2599 case SVt_PVCV:
ea726b52 2600 cv = MUTABLE_CV(sv);
a0d0e21e 2601 break;
a0d0e21e
LW
2602 }
2603
a57c6685 2604 ENTER;
a0d0e21e
LW
2605 SAVETMPS;
2606
2607 retry:
541ed3a9
FC
2608 if (CvCLONE(cv) && ! CvCLONED(cv))
2609 DIE(aTHX_ "Closure prototype called");
a0d0e21e 2610 if (!CvROOT(cv) && !CvXSUB(cv)) {
2f349aa0
NC
2611 GV* autogv;
2612 SV* sub_name;
2613
2614 /* anonymous or undef'd function leaves us no recourse */
2615 if (CvANON(cv) || !(gv = CvGV(cv)))
2616 DIE(aTHX_ "Undefined subroutine called");
2617
2618 /* autoloaded stub? */
2619 if (cv != GvCV(gv)) {
2620 cv = GvCV(gv);
2621 }
2622 /* should call AUTOLOAD now? */
2623 else {
7e623da3 2624try_autoload:
d1089224
BF
2625 if ((autogv = gv_autoload_pvn(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv),
2626 GvNAMEUTF8(gv) ? SVf_UTF8 : 0)))
2f349aa0
NC
2627 {
2628 cv = GvCV(autogv);
2629 }
2f349aa0 2630 else {
c220e1a1 2631 sorry:
2f349aa0 2632 sub_name = sv_newmortal();
6136c704 2633 gv_efullname3(sub_name, gv, NULL);
be2597df 2634 DIE(aTHX_ "Undefined subroutine &%"SVf" called", SVfARG(sub_name));
2f349aa0
NC
2635 }
2636 }
2637 if (!cv)
c220e1a1 2638 goto sorry;
2f349aa0 2639 goto retry;
a0d0e21e
LW
2640 }
2641
54310121 2642 gimme = GIMME_V;
67caa1fe 2643 if ((PL_op->op_private & OPpENTERSUB_DB) && GvCV(PL_DBsub) && !CvNODEBUG(cv)) {
005a8a35 2644 Perl_get_db_sub(aTHX_ &sv, cv);
a9ef256d
NC
2645 if (CvISXSUB(cv))
2646 PL_curcopdb = PL_curcop;
1ad62f64 2647 if (CvLVALUE(cv)) {
2648 /* check for lsub that handles lvalue subroutines */
ae5c1e95 2649 cv = GvCV(gv_HVadd(gv_fetchpvs("DB::lsub", GV_ADDMULTI, SVt_PVHV)));
1ad62f64 2650 /* if lsub not found then fall back to DB::sub */
2651 if (!cv) cv = GvCV(PL_DBsub);
2652 } else {
2653 cv = GvCV(PL_DBsub);
2654 }
a9ef256d 2655
ccafdc96
RGS
2656 if (!cv || (!CvXSUB(cv) && !CvSTART(cv)))
2657 DIE(aTHX_ "No DB::sub routine defined");
67caa1fe 2658 }
a0d0e21e 2659
aed2304a 2660 if (!(CvISXSUB(cv))) {
f1025168 2661 /* This path taken at least 75% of the time */
a0d0e21e 2662 dMARK;
eb578fdb 2663 I32 items = SP - MARK;
b70d5558 2664 PADLIST * const padlist = CvPADLIST(cv);
a0d0e21e
LW
2665 PUSHBLOCK(cx, CXt_SUB, MARK);
2666 PUSHSUB(cx);
f39bc417 2667 cx->blk_sub.retop = PL_op->op_next;
a0d0e21e 2668 CvDEPTH(cv)++;
3a76ca88
RGS
2669 if (CvDEPTH(cv) >= 2) {
2670 PERL_STACK_OVERFLOW_CHECK();
2671 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2672 }
3a76ca88
RGS
2673 SAVECOMPPAD();
2674 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
2675 if (hasargs) {
10533ace 2676 AV *const av = MUTABLE_AV(PAD_SVl(0));
221373f0
GS
2677 if (AvREAL(av)) {
2678 /* @_ is normally not REAL--this should only ever
2679 * happen when DB::sub() calls things that modify @_ */
2680 av_clear(av);
2681 AvREAL_off(av);
2682 AvREIFY_on(av);
2683 }
3280af22 2684 cx->blk_sub.savearray = GvAV(PL_defgv);
502c6561 2685 GvAV(PL_defgv) = MUTABLE_AV(SvREFCNT_inc_simple(av));
dd2155a4 2686 CX_CURPAD_SAVE(cx->blk_sub);
6d4ff0d2 2687 cx->blk_sub.argarray = av;
a0d0e21e
LW
2688 ++MARK;
2689
2690 if (items > AvMAX(av) + 1) {
504618e9 2691 SV **ary = AvALLOC(av);
a0d0e21e
LW
2692 if (AvARRAY(av) != ary) {
2693 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
9c6bc640 2694 AvARRAY(av) = ary;
a0d0e21e
LW
2695 }
2696 if (items > AvMAX(av) + 1) {
2697 AvMAX(av) = items - 1;
2698 Renew(ary,items,SV*);
2699 AvALLOC(av) = ary;
9c6bc640 2700 AvARRAY(av) = ary;
a0d0e21e
LW
2701 }
2702 }
2703 Copy(MARK,AvARRAY(av),items,SV*);
93965878 2704 AvFILLp(av) = items - 1;
1c846c1f 2705
a0d0e21e
LW
2706 while (items--) {
2707 if (*MARK)
2708 SvTEMP_off(*MARK);
2709 MARK++;
2710 }
2711 }
da1dff94
FC
2712 if ((cx->blk_u16 & OPpENTERSUB_LVAL_MASK) == OPpLVAL_INTRO &&
2713 !CvLVALUE(cv))
2714 DIE(aTHX_ "Can't modify non-lvalue subroutine call");
4a925ff6
GS
2715 /* warning must come *after* we fully set up the context
2716 * stuff so that __WARN__ handlers can safely dounwind()
2717 * if they want to
2718 */
2b9dff67 2719 if (CvDEPTH(cv) == PERL_SUB_DEPTH_WARN && ckWARN(WARN_RECURSION)
4a925ff6
GS
2720 && !(PERLDB_SUB && cv == GvCV(PL_DBsub)))
2721 sub_crush_depth(cv);
a0d0e21e
LW
2722 RETURNOP(CvSTART(cv));
2723 }
f1025168 2724 else {
3a76ca88 2725 I32 markix = TOPMARK;
f1025168 2726
3a76ca88 2727 PUTBACK;
f1025168 2728
3a76ca88
RGS
2729 if (!hasargs) {
2730 /* Need to copy @_ to stack. Alternative may be to
2731 * switch stack to @_, and copy return values
2732 * back. This would allow popping @_ in XSUB, e.g.. XXXX */
2733 AV * const av = GvAV(PL_defgv);
2734 const I32 items = AvFILLp(av) + 1; /* @_ is not tieable */
2735
2736 if (items) {
2737 /* Mark is at the end of the stack. */
2738 EXTEND(SP, items);
2739 Copy(AvARRAY(av), SP + 1, items, SV*);
2740 SP += items;
2741 PUTBACK ;
2742 }
2743 }
2744 /* We assume first XSUB in &DB::sub is the called one. */
2745 if (PL_curcopdb) {
2746 SAVEVPTR(PL_curcop);
2747 PL_curcop = PL_curcopdb;
2748 PL_curcopdb = NULL;
2749 }
2750 /* Do we need to open block here? XXXX */
72df79cf 2751
2752 /* CvXSUB(cv) must not be NULL because newXS() refuses NULL xsub address */
2753 assert(CvXSUB(cv));
16c91539 2754 CvXSUB(cv)(aTHX_ cv);
3a76ca88
RGS
2755
2756 /* Enforce some sanity in scalar context. */
2757 if (gimme == G_SCALAR && ++markix != PL_stack_sp - PL_stack_base ) {
2758 if (markix > PL_stack_sp - PL_stack_base)
2759 *(PL_stack_base + markix) = &PL_sv_undef;
2760 else
2761 *(PL_stack_base + markix) = *PL_stack_sp;
2762 PL_stack_sp = PL_stack_base + markix;
2763 }
a57c6685 2764 LEAVE;
f1025168
NC
2765 return NORMAL;
2766 }
a0d0e21e
LW
2767}
2768
44a8e56a 2769void
864dbfa3 2770Perl_sub_crush_depth(pTHX_ CV *cv)
44a8e56a 2771{
7918f24d
NC
2772 PERL_ARGS_ASSERT_SUB_CRUSH_DEPTH;
2773
44a8e56a 2774 if (CvANON(cv))
9014280d 2775 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on anonymous subroutine");
44a8e56a 2776 else {
aec46f14 2777 SV* const tmpstr = sv_newmortal();
6136c704 2778 gv_efullname3(tmpstr, CvGV(cv), NULL);
35c1215d 2779 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on subroutine \"%"SVf"\"",
be2597df 2780 SVfARG(tmpstr));
44a8e56a
PP
2781 }
2782}
2783
a0d0e21e
LW
2784PP(pp_aelem)
2785{
97aff369 2786 dVAR; dSP;
a0d0e21e 2787 SV** svp;
a3b680e6 2788 SV* const elemsv = POPs;
d804643f 2789 IV elem = SvIV(elemsv);
502c6561 2790 AV *const av = MUTABLE_AV(POPs);
e1ec3a88
AL
2791 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
2792 const U32 defer = (PL_op->op_private & OPpLVAL_DEFER) && (elem > av_len(av));
4ad10a0b
VP
2793 const bool localizing = PL_op->op_private & OPpLVAL_INTRO;
2794 bool preeminent = TRUE;
be6c24e0 2795 SV *sv;
a0d0e21e 2796
e35c1634 2797 if (SvROK(elemsv) && !SvGAMAGIC(elemsv) && ckWARN(WARN_MISC))
95b63a38
JH
2798 Perl_warner(aTHX_ packWARN(WARN_MISC),
2799 "Use of reference \"%"SVf"\" as array index",
be2597df 2800 SVfARG(elemsv));
a0d0e21e
LW
2801 if (SvTYPE(av) != SVt_PVAV)
2802 RETPUSHUNDEF;
4ad10a0b
VP
2803
2804 if (localizing) {
2805 MAGIC *mg;
2806 HV *stash;
2807
2808 /* If we can determine whether the element exist,
2809 * Try to preserve the existenceness of a tied array
2810 * element by using EXISTS and DELETE if possible.
2811 * Fallback to FETCH and STORE otherwise. */
2812 if (SvCANEXISTDELETE(av))
2813 preeminent = av_exists(av, elem);
2814 }
2815
68dc0745 2816 svp = av_fetch(av, elem, lval && !defer);
a0d0e21e 2817 if (lval) {
2b573ace 2818#ifdef PERL_MALLOC_WRAP
2b573ace 2819 if (SvUOK(elemsv)) {
a9c4fd4e 2820 const UV uv = SvUV(elemsv);
2b573ace
JH
2821 elem = uv > IV_MAX ? IV_MAX : uv;
2822 }
2823 else if (SvNOK(elemsv))
2824 elem = (IV)SvNV(elemsv);
a3b680e6
AL
2825 if (elem > 0) {
2826 static const char oom_array_extend[] =
2827 "Out of memory during array extend"; /* Duplicated in av.c */
2b573ace 2828 MEM_WRAP_CHECK_1(elem,SV*,oom_array_extend);
a3b680e6 2829 }
2b573ace 2830#endif
3280af22 2831 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
2832 SV* lv;
2833 if (!defer)
cea2e8a9 2834 DIE(aTHX_ PL_no_aelem, elem);
68dc0745
PP
2835 lv = sv_newmortal();
2836 sv_upgrade(lv, SVt_PVLV);
2837 LvTYPE(lv) = 'y';
a0714e2c 2838 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
b37c2d43 2839 LvTARG(lv) = SvREFCNT_inc_simple(av);
68dc0745
PP
2840 LvTARGOFF(lv) = elem;
2841 LvTARGLEN(lv) = 1;
2842 PUSHs(lv);
2843 RETURN;
2844 }
4ad10a0b
VP
2845 if (localizing) {
2846 if (preeminent)
2847 save_aelem(av, elem, svp);
2848 else
2849 SAVEADELETE(av, elem);
2850 }
9026059d
GG
2851 else if (PL_op->op_private & OPpDEREF) {
2852 PUSHs(vivify_ref(*svp, PL_op->op_private & OPpDEREF));
2853 RETURN;
2854 }
a0d0e21e 2855 }
3280af22 2856 sv = (svp ? *svp : &PL_sv_undef);
39cf747a 2857 if (!lval && SvRMAGICAL(av) && SvGMAGICAL(sv)) /* see note in pp_helem() */
fd69380d 2858 mg_get(sv);
be6c24e0 2859 PUSHs(sv);
a0d0e21e
LW
2860 RETURN;
2861}
2862
9026059d 2863SV*
864dbfa3 2864Perl_vivify_ref(pTHX_ SV *sv, U32 to_what)
02a9e968 2865{
7918f24d
NC
2866 PERL_ARGS_ASSERT_VIVIFY_REF;
2867
5b295bef 2868 SvGETMAGIC(sv);
02a9e968
CS
2869 if (!SvOK(sv)) {
2870 if (SvREADONLY(sv))
6ad8f254 2871 Perl_croak_no_modify(aTHX);
43230e26 2872 prepare_SV_for_RV(sv);
68dc0745 2873 switch (to_what) {
5f05dabc 2874 case OPpDEREF_SV:
561b68a9 2875 SvRV_set(sv, newSV(0));
5f05dabc
PP
2876 break;
2877 case OPpDEREF_AV:
ad64d0ec 2878 SvRV_set(sv, MUTABLE_SV(newAV()));
5f05dabc
PP
2879 break;
2880 case OPpDEREF_HV:
ad64d0ec 2881 SvRV_set(sv, MUTABLE_SV(newHV()));
5f05dabc
PP
2882 break;
2883 }
02a9e968
CS
2884 SvROK_on(sv);
2885 SvSETMAGIC(sv);
7e482323 2886 SvGETMAGIC(sv);
02a9e968 2887 }
9026059d
GG
2888 if (SvGMAGICAL(sv)) {
2889 /* copy the sv without magic to prevent magic from being
2890 executed twice */
2891 SV* msv = sv_newmortal();
2892 sv_setsv_nomg(msv, sv);
2893 return msv;
2894 }
2895 return sv;
02a9e968
CS
2896}
2897
a0d0e21e
LW
2898PP(pp_method)
2899{
97aff369 2900 dVAR; dSP;
890ce7af 2901 SV* const sv = TOPs;
f5d5a27c
CS
2902
2903 if (SvROK(sv)) {
890ce7af 2904 SV* const rsv = SvRV(sv);
f5d5a27c
CS
2905 if (SvTYPE(rsv) == SVt_PVCV) {
2906 SETs(rsv);
2907 RETURN;
2908 }
2909 }
2910
4608196e 2911 SETs(method_common(sv, NULL));
f5d5a27c
CS
2912 RETURN;
2913}
2914
2915PP(pp_method_named)
2916{
97aff369 2917 dVAR; dSP;
890ce7af 2918 SV* const sv = cSVOP_sv;
c158a4fd 2919 U32 hash = SvSHARED_HASH(sv);
f5d5a27c
CS
2920
2921 XPUSHs(method_common(sv, &hash));
2922 RETURN;
2923}
2924
2925STATIC SV *
2926S_method_common(pTHX_ SV* meth, U32* hashp)
2927{
97aff369 2928 dVAR;
a0d0e21e
LW
2929 SV* ob;
2930 GV* gv;
56304f61 2931 HV* stash;
a0714e2c 2932 SV *packsv = NULL;
f226e9be
FC
2933 SV * const sv = PL_stack_base + TOPMARK == PL_stack_sp
2934 ? (Perl_croak(aTHX_ "Can't call method \"%"SVf"\" without a "
2935 "package or object reference", SVfARG(meth)),
2936 (SV *)NULL)
2937 : *(PL_stack_base + TOPMARK + 1);
f5d5a27c 2938
7918f24d
NC
2939 PERL_ARGS_ASSERT_METHOD_COMMON;
2940
4f1b7578 2941 if (!sv)
a214957f
VP
2942 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" on an undefined value",
2943 SVfARG(meth));
4f1b7578 2944
5b295bef 2945 SvGETMAGIC(sv);
a0d0e21e 2946 if (SvROK(sv))
ad64d0ec 2947 ob = MUTABLE_SV(SvRV(sv));
a0d0e21e
LW
2948 else {
2949 GV* iogv;
f937af42
BF
2950 STRLEN packlen;
2951 const char * packname = NULL;
da6b625f 2952 bool packname_is_utf8 = FALSE;
a0d0e21e 2953
af09ea45 2954 /* this isn't a reference */
da6b625f
FC
2955 if(SvOK(sv) && (packname = SvPV_nomg_const(sv, packlen))) {
2956 const HE* const he =
2957 (const HE *)hv_common_key_len(
2958 PL_stashcache, packname,
2959 packlen * -(packname_is_utf8 = !!SvUTF8(sv)), 0, NULL, 0
2960 );
2961
081fc587 2962 if (he) {
5e6396ae 2963 stash = INT2PTR(HV*,SvIV(HeVAL(he)));
081fc587
AB
2964 goto fetch;
2965 }
2966 }
2967
a0d0e21e 2968 if (!SvOK(sv) ||
05f5af9a 2969 !(packname) ||
da6b625f
FC
2970 !(iogv = gv_fetchpvn_flags(
2971 packname, packlen, SVf_UTF8 * packname_is_utf8, SVt_PVIO
2972 )) ||
ad64d0ec 2973 !(ob=MUTABLE_SV(GvIO(iogv))))
a0d0e21e 2974 {
af09ea45 2975 /* this isn't the name of a filehandle either */
1c846c1f 2976 if (!packname ||
fd400ab9 2977 ((UTF8_IS_START(*packname) && DO_UTF8(sv))
b86a2fa7 2978 ? !isIDFIRST_utf8((U8*)packname)
d47f310d 2979 : !isIDFIRST_L1((U8)*packname)
834a4ddd
LW
2980 ))
2981 {
d5e45555 2982 /* diag_listed_as: Can't call method "%s" without a package or object reference */
a214957f
VP
2983 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" %s",
2984 SVfARG(meth),
f5d5a27c
CS
2985 SvOK(sv) ? "without a package or object reference"
2986 : "on an undefined value");
834a4ddd 2987 }
af09ea45 2988 /* assume it's a package name */
f937af42 2989 stash = gv_stashpvn(packname, packlen, packname_is_utf8 ? SVf_UTF8 : 0);
0dae17bd
GS
2990 if (!stash)
2991 packsv = sv;
081fc587 2992 else {
d4c19fe8 2993 SV* const ref = newSViv(PTR2IV(stash));
f937af42 2994 (void)hv_store(PL_stashcache, packname,
c60dbbc3 2995 packname_is_utf8 ? -(I32)packlen : (I32)packlen, ref, 0);
7e8961ec 2996 }
ac91690f 2997 goto fetch;
a0d0e21e 2998 }
af09ea45 2999 /* it _is_ a filehandle name -- replace with a reference */
ad64d0ec 3000 *(PL_stack_base + TOPMARK + 1) = sv_2mortal(newRV(MUTABLE_SV(iogv)));
a0d0e21e
LW
3001 }
3002
af09ea45 3003 /* if we got here, ob should be a reference or a glob */
f0d43078 3004 if (!ob || !(SvOBJECT(ob)
6e592b3a
BM
3005 || (SvTYPE(ob) == SVt_PVGV
3006 && isGV_with_GP(ob)
159b6efe 3007 && (ob = MUTABLE_SV(GvIO((const GV *)ob)))
f0d43078
GS
3008 && SvOBJECT(ob))))
3009 {
b375e37b
BF
3010 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" on unblessed reference",
3011 SVfARG((SvSCREAM(meth) && strEQ(SvPV_nolen_const(meth),"isa"))
3012 ? newSVpvs_flags("DOES", SVs_TEMP)
3013 : meth));
f0d43078 3014 }
a0d0e21e 3015
56304f61 3016 stash = SvSTASH(ob);
a0d0e21e 3017
ac91690f 3018 fetch:
af09ea45
IK
3019 /* NOTE: stash may be null, hope hv_fetch_ent and
3020 gv_fetchmethod can cope (it seems they can) */
3021
f5d5a27c
CS
3022 /* shortcut for simple names */
3023 if (hashp) {
b464bac0 3024 const HE* const he = hv_fetch_ent(stash, meth, 0, *hashp);
f5d5a27c 3025 if (he) {
159b6efe 3026 gv = MUTABLE_GV(HeVAL(he));
f5d5a27c 3027 if (isGV(gv) && GvCV(gv) &&
e1a479c5 3028 (!GvCVGEN(gv) || GvCVGEN(gv)
dd69841b 3029 == (PL_sub_generation + HvMROMETA(stash)->cache_gen)))
ad64d0ec 3030 return MUTABLE_SV(GvCV(gv));
f5d5a27c
CS
3031 }
3032 }
3033
f937af42
BF
3034 gv = gv_fetchmethod_sv_flags(stash ? stash : MUTABLE_HV(packsv),
3035 meth, GV_AUTOLOAD | GV_CROAK);
9b9d0b15 3036
256d1bb2 3037 assert(gv);
9b9d0b15 3038
ad64d0ec 3039 return isGV(gv) ? MUTABLE_SV(GvCV(gv)) : MUTABLE_SV(gv);
a0d0e21e 3040}
241d1a3b
NC
3041
3042/*
3043 * Local variables:
3044 * c-indentation-style: bsd
3045 * c-basic-offset: 4
14d04a33 3046 * indent-tabs-mode: nil
241d1a3b
NC
3047 * End:
3048 *
14d04a33 3049 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3050 */