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[perl5.git] / pp_hot.c
CommitLineData
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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;
4cc783ef
DD
88 SV * const sv = TOPs;
89 SETs(TARG);
90 sv_copypv(TARG, sv);
91 SvSETMAGIC(TARG);
92 /* no PUTBACK, SETs doesn't inc/dec SP */
93 return NORMAL;
a0d0e21e
LW
94}
95
96PP(pp_gv)
97{
97aff369 98 dVAR; dSP;
ad64d0ec 99 XPUSHs(MUTABLE_SV(cGVOP_gv));
a0d0e21e
LW
100 RETURN;
101}
102
103PP(pp_and)
104{
4cc783ef 105 dVAR;
f410a211 106 PERL_ASYNC_CHECK();
4cc783ef
DD
107 {
108 /* SP is not used to remove a variable that is saved across the
109 sv_2bool_flags call in SvTRUE_NN, if a RISC/CISC or low/high machine
110 register or load/store vs direct mem ops macro is introduced, this
111 should be a define block between direct PL_stack_sp and dSP operations,
112 presently, using PL_stack_sp is bias towards CISC cpus */
113 SV * const sv = *PL_stack_sp;
114 if (!SvTRUE_NN(sv))
115 return NORMAL;
116 else {
117 if (PL_op->op_type == OP_AND)
118 --PL_stack_sp;
119 return cLOGOP->op_other;
120 }
a0d0e21e
LW
121 }
122}
123
124PP(pp_sassign)
125{
3e75a3c4
RU
126 dVAR; dSP;
127 /* sassign keeps its args in the optree traditionally backwards.
128 So we pop them differently.
129 */
130 SV *left = POPs; SV *right = TOPs;
748a9306 131
533c011a 132 if (PL_op->op_private & OPpASSIGN_BACKWARDS) {
0bd48802
AL
133 SV * const temp = left;
134 left = right; right = temp;
a0d0e21e 135 }
284167a5 136 if (TAINTING_get && TAINT_get && !SvTAINTED(right))
a0d0e21e 137 TAINT_NOT;
e26df76a 138 if (PL_op->op_private & OPpASSIGN_CV_TO_GV) {
3e75a3c4 139 SV * const cv = SvRV(right);
e26df76a 140 const U32 cv_type = SvTYPE(cv);
3e75a3c4 141 const bool is_gv = isGV_with_GP(left);
6136c704 142 const bool got_coderef = cv_type == SVt_PVCV || cv_type == SVt_PVFM;
e26df76a
NC
143
144 if (!got_coderef) {
145 assert(SvROK(cv));
146 }
147
3e75a3c4
RU
148 /* Can do the optimisation if left (LVALUE) is not a typeglob,
149 right (RVALUE) is a reference to something, and we're in void
e26df76a 150 context. */
13be902c 151 if (!got_coderef && !is_gv && GIMME_V == G_VOID) {
e26df76a 152 /* Is the target symbol table currently empty? */
3e75a3c4 153 GV * const gv = gv_fetchsv_nomg(left, GV_NOINIT, SVt_PVGV);
bb112e5a 154 if (SvTYPE(gv) != SVt_PVGV && !SvOK(gv)) {
e26df76a
NC
155 /* Good. Create a new proxy constant subroutine in the target.
156 The gv becomes a(nother) reference to the constant. */
157 SV *const value = SvRV(cv);
158
ad64d0ec 159 SvUPGRADE(MUTABLE_SV(gv), SVt_IV);
1ccdb730 160 SvPCS_IMPORTED_on(gv);
e26df76a 161 SvRV_set(gv, value);
b37c2d43 162 SvREFCNT_inc_simple_void(value);
3e75a3c4 163 SETs(left);
e26df76a
NC
164 RETURN;
165 }
166 }
167
168 /* Need to fix things up. */
13be902c 169 if (!is_gv) {
e26df76a 170 /* Need to fix GV. */
3e75a3c4 171 left = MUTABLE_SV(gv_fetchsv_nomg(left,GV_ADD, SVt_PVGV));
e26df76a
NC
172 }
173
174 if (!got_coderef) {
175 /* We've been returned a constant rather than a full subroutine,
176 but they expect a subroutine reference to apply. */
53a42478 177 if (SvROK(cv)) {
d343c3ef 178 ENTER_with_name("sassign_coderef");
53a42478
NC
179 SvREFCNT_inc_void(SvRV(cv));
180 /* newCONSTSUB takes a reference count on the passed in SV
181 from us. We set the name to NULL, otherwise we get into
182 all sorts of fun as the reference to our new sub is
183 donated to the GV that we're about to assign to.
184 */
3e75a3c4 185 SvRV_set(right, MUTABLE_SV(newCONSTSUB(GvSTASH(left), NULL,
ad64d0ec 186 SvRV(cv))));
fc2b2dca 187 SvREFCNT_dec_NN(cv);
d343c3ef 188 LEAVE_with_name("sassign_coderef");
53a42478
NC
189 } else {
190 /* What can happen for the corner case *{"BONK"} = \&{"BONK"};
191 is that
192 First: ops for \&{"BONK"}; return us the constant in the
193 symbol table
194 Second: ops for *{"BONK"} cause that symbol table entry
195 (and our reference to it) to be upgraded from RV
196 to typeblob)
197 Thirdly: We get here. cv is actually PVGV now, and its
198 GvCV() is actually the subroutine we're looking for
199
200 So change the reference so that it points to the subroutine
201 of that typeglob, as that's what they were after all along.
202 */
159b6efe 203 GV *const upgraded = MUTABLE_GV(cv);
53a42478
NC
204 CV *const source = GvCV(upgraded);
205
206 assert(source);
207 assert(CvFLAGS(source) & CVf_CONST);
208
209 SvREFCNT_inc_void(source);
fc2b2dca 210 SvREFCNT_dec_NN(upgraded);
3e75a3c4 211 SvRV_set(right, MUTABLE_SV(source));
53a42478 212 }
e26df76a 213 }
53a42478 214
e26df76a 215 }
8fe85e3f 216 if (
3e75a3c4
RU
217 SvTEMP(left) && !SvSMAGICAL(left) && SvREFCNT(left) == 1 &&
218 (!isGV_with_GP(left) || SvFAKE(left)) && ckWARN(WARN_MISC)
8fe85e3f
FC
219 )
220 Perl_warner(aTHX_
221 packWARN(WARN_MISC), "Useless assignment to a temporary"
222 );
3e75a3c4
RU
223 SvSetMagicSV(left, right);
224 SETs(left);
a0d0e21e
LW
225 RETURN;
226}
227
228PP(pp_cond_expr)
229{
97aff369 230 dVAR; dSP;
f410a211 231 PERL_ASYNC_CHECK();
a0d0e21e 232 if (SvTRUEx(POPs))
1a67a97c 233 RETURNOP(cLOGOP->op_other);
a0d0e21e 234 else
1a67a97c 235 RETURNOP(cLOGOP->op_next);
a0d0e21e
LW
236}
237
238PP(pp_unstack)
239{
97aff369 240 dVAR;
8f3964af 241 PERL_ASYNC_CHECK();
a0d0e21e 242 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 243 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e 244 FREETMPS;
eae48c89
Z
245 if (!(PL_op->op_flags & OPf_SPECIAL)) {
246 I32 oldsave = PL_scopestack[PL_scopestack_ix - 1];
247 LEAVE_SCOPE(oldsave);
248 }
a0d0e21e
LW
249 return NORMAL;
250}
251
a0d0e21e
LW
252PP(pp_concat)
253{
6f1401dc 254 dVAR; dSP; dATARGET; tryAMAGICbin_MG(concat_amg, AMGf_assign);
748a9306
LW
255 {
256 dPOPTOPssrl;
8d6d96c1
HS
257 bool lbyte;
258 STRLEN rlen;
d4c19fe8 259 const char *rpv = NULL;
a6b599c7 260 bool rbyte = FALSE;
a9c4fd4e 261 bool rcopied = FALSE;
8d6d96c1 262
6f1401dc
DM
263 if (TARG == right && right != left) { /* $r = $l.$r */
264 rpv = SvPV_nomg_const(right, rlen);
c75ab21a 265 rbyte = !DO_UTF8(right);
59cd0e26 266 right = newSVpvn_flags(rpv, rlen, SVs_TEMP);
349d4f2f 267 rpv = SvPV_const(right, rlen); /* no point setting UTF-8 here */
db79b45b 268 rcopied = TRUE;
8d6d96c1 269 }
7889fe52 270
89734059 271 if (TARG != left) { /* not $l .= $r */
a9c4fd4e 272 STRLEN llen;
6f1401dc 273 const char* const lpv = SvPV_nomg_const(left, llen);
90f5826e 274 lbyte = !DO_UTF8(left);
8d6d96c1
HS
275 sv_setpvn(TARG, lpv, llen);
276 if (!lbyte)
277 SvUTF8_on(TARG);
278 else
279 SvUTF8_off(TARG);
280 }
89734059 281 else { /* $l .= $r */
c75ab21a 282 if (!SvOK(TARG)) {
89734059 283 if (left == right && ckWARN(WARN_UNINITIALIZED)) /* $l .= $l */
c75ab21a 284 report_uninit(right);
76f68e9b 285 sv_setpvs(left, "");
c75ab21a 286 }
583a5589
FC
287 SvPV_force_nomg_nolen(left);
288 lbyte = !DO_UTF8(left);
90f5826e
ST
289 if (IN_BYTES)
290 SvUTF8_off(TARG);
8d6d96c1 291 }
a12c0f56 292
c75ab21a 293 if (!rcopied) {
6f1401dc 294 if (left == right)
89734059 295 /* $r.$r: do magic twice: tied might return different 2nd time */
6f1401dc
DM
296 SvGETMAGIC(right);
297 rpv = SvPV_nomg_const(right, rlen);
c75ab21a
RH
298 rbyte = !DO_UTF8(right);
299 }
8d6d96c1 300 if (lbyte != rbyte) {
e3393f51
NT
301 /* sv_utf8_upgrade_nomg() may reallocate the stack */
302 PUTBACK;
8d6d96c1
HS
303 if (lbyte)
304 sv_utf8_upgrade_nomg(TARG);
305 else {
db79b45b 306 if (!rcopied)
59cd0e26 307 right = newSVpvn_flags(rpv, rlen, SVs_TEMP);
8d6d96c1 308 sv_utf8_upgrade_nomg(right);
6f1401dc 309 rpv = SvPV_nomg_const(right, rlen);
69b47968 310 }
e3393f51 311 SPAGAIN;
a0d0e21e 312 }
8d6d96c1 313 sv_catpvn_nomg(TARG, rpv, rlen);
43ebc500 314
a0d0e21e
LW
315 SETTARG;
316 RETURN;
748a9306 317 }
a0d0e21e
LW
318}
319
d5524600
DM
320/* push the elements of av onto the stack.
321 * XXX Note that padav has similar code but without the mg_get().
322 * I suspect that the mg_get is no longer needed, but while padav
323 * differs, it can't share this function */
324
f9ae8fb6 325STATIC void
d5524600
DM
326S_pushav(pTHX_ AV* const av)
327{
328 dSP;
329 const I32 maxarg = AvFILL(av) + 1;
330 EXTEND(SP, maxarg);
331 if (SvRMAGICAL(av)) {
332 U32 i;
333 for (i=0; i < (U32)maxarg; i++) {
334 SV ** const svp = av_fetch(av, i, FALSE);
335 /* See note in pp_helem, and bug id #27839 */
336 SP[i+1] = svp
337 ? SvGMAGICAL(*svp) ? (mg_get(*svp), *svp) : *svp
338 : &PL_sv_undef;
339 }
340 }
341 else {
342 Copy(AvARRAY(av), SP+1, maxarg, SV*);
343 }
344 SP += maxarg;
345 PUTBACK;
346}
347
348
a7fd8ef6
DM
349/* ($lex1,@lex2,...) or my ($lex1,@lex2,...) */
350
351PP(pp_padrange)
352{
353 dVAR; dSP;
354 PADOFFSET base = PL_op->op_targ;
355 int count = (int)(PL_op->op_private) & OPpPADRANGE_COUNTMASK;
356 int i;
d5524600
DM
357 if (PL_op->op_flags & OPf_SPECIAL) {
358 /* fake the RHS of my ($x,$y,..) = @_ */
359 PUSHMARK(SP);
360 S_pushav(aTHX_ GvAVn(PL_defgv));
361 SPAGAIN;
362 }
363
a7fd8ef6
DM
364 /* note, this is only skipped for compile-time-known void cxt */
365 if ((PL_op->op_flags & OPf_WANT) != OPf_WANT_VOID) {
366 EXTEND(SP, count);
367 PUSHMARK(SP);
368 for (i = 0; i <count; i++)
369 *++SP = PAD_SV(base+i);
370 }
371 if (PL_op->op_private & OPpLVAL_INTRO) {
4e09461c
DM
372 SV **svp = &(PAD_SVl(base));
373 const UV payload = (UV)(
374 (base << (OPpPADRANGE_COUNTSHIFT + SAVE_TIGHT_SHIFT))
375 | (count << SAVE_TIGHT_SHIFT)
376 | SAVEt_CLEARPADRANGE);
377 assert(OPpPADRANGE_COUNTMASK + 1 == (1 <<OPpPADRANGE_COUNTSHIFT));
378 assert((payload >> (OPpPADRANGE_COUNTSHIFT+SAVE_TIGHT_SHIFT)) == base);
a3444cc5
DM
379 {
380 dSS_ADD;
381 SS_ADD_UV(payload);
382 SS_ADD_END(1);
383 }
4e09461c 384
a7fd8ef6 385 for (i = 0; i <count; i++)
4e09461c 386 SvPADSTALE_off(*svp++); /* mark lexical as active */
a7fd8ef6
DM
387 }
388 RETURN;
389}
390
391
a0d0e21e
LW
392PP(pp_padsv)
393{
6c28b496
DD
394 dVAR; dSP;
395 EXTEND(SP, 1);
396 {
397 OP * const op = PL_op;
398 /* access PL_curpad once */
399 SV ** const padentry = &(PAD_SVl(op->op_targ));
400 {
401 dTARG;
402 TARG = *padentry;
403 PUSHs(TARG);
404 PUTBACK; /* no pop/push after this, TOPs ok */
8ec5e241 405 }
6c28b496
DD
406 if (op->op_flags & OPf_MOD) {
407 if (op->op_private & OPpLVAL_INTRO)
408 if (!(op->op_private & OPpPAD_STATE))
409 save_clearsv(padentry);
410 if (op->op_private & OPpDEREF) {
8f90a16d
FC
411 /* TOPs is equivalent to TARG here. Using TOPs (SP) rather
412 than TARG reduces the scope of TARG, so it does not
413 span the call to save_clearsv, resulting in smaller
414 machine code. */
6c28b496
DD
415 TOPs = vivify_ref(TOPs, op->op_private & OPpDEREF);
416 }
417 }
418 return op->op_next;
4633a7c4 419 }
a0d0e21e
LW
420}
421
422PP(pp_readline)
423{
97aff369 424 dVAR;
30901a8a
FC
425 dSP;
426 if (TOPs) {
427 SvGETMAGIC(TOPs);
fc99edcf 428 tryAMAGICunTARGETlist(iter_amg, 0);
30901a8a
FC
429 PL_last_in_gv = MUTABLE_GV(*PL_stack_sp--);
430 }
431 else PL_last_in_gv = PL_argvgv, PL_stack_sp--;
6e592b3a
BM
432 if (!isGV_with_GP(PL_last_in_gv)) {
433 if (SvROK(PL_last_in_gv) && isGV_with_GP(SvRV(PL_last_in_gv)))
159b6efe 434 PL_last_in_gv = MUTABLE_GV(SvRV(PL_last_in_gv));
8efb3254 435 else {
f5284f61 436 dSP;
ad64d0ec 437 XPUSHs(MUTABLE_SV(PL_last_in_gv));
f5284f61 438 PUTBACK;
897d3989 439 Perl_pp_rv2gv(aTHX);
159b6efe 440 PL_last_in_gv = MUTABLE_GV(*PL_stack_sp--);
f5284f61
IZ
441 }
442 }
a0d0e21e
LW
443 return do_readline();
444}
445
446PP(pp_eq)
447{
6f1401dc 448 dVAR; dSP;
33efebe6
DM
449 SV *left, *right;
450
a42d0242 451 tryAMAGICbin_MG(eq_amg, AMGf_set|AMGf_numeric);
33efebe6
DM
452 right = POPs;
453 left = TOPs;
454 SETs(boolSV(
455 (SvIOK_notUV(left) && SvIOK_notUV(right))
456 ? (SvIVX(left) == SvIVX(right))
457 : ( do_ncmp(left, right) == 0)
458 ));
459 RETURN;
a0d0e21e
LW
460}
461
462PP(pp_preinc)
463{
97aff369 464 dVAR; dSP;
17058fe0
FC
465 const bool inc =
466 PL_op->op_type == OP_PREINC || PL_op->op_type == OP_I_PREINC;
60092ce4 467 if (SvTYPE(TOPs) >= SVt_PVAV || (isGV_with_GP(TOPs) && !SvFAKE(TOPs)))
cb077ed2 468 Perl_croak_no_modify();
4bac9ae4 469 if (!SvREADONLY(TOPs) && !SvGMAGICAL(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
17058fe0 470 && SvIVX(TOPs) != (inc ? IV_MAX : IV_MIN))
55497cff 471 {
17058fe0 472 SvIV_set(TOPs, SvIVX(TOPs) + (inc ? 1 : -1));
55497cff 473 SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
748a9306 474 }
28e5dec8 475 else /* Do all the PERL_PRESERVE_IVUV conditionals in sv_inc */
17058fe0
FC
476 if (inc) sv_inc(TOPs);
477 else sv_dec(TOPs);
a0d0e21e
LW
478 SvSETMAGIC(TOPs);
479 return NORMAL;
480}
481
482PP(pp_or)
483{
97aff369 484 dVAR; dSP;
f410a211 485 PERL_ASYNC_CHECK();
a0d0e21e
LW
486 if (SvTRUE(TOPs))
487 RETURN;
488 else {
c960fc3b
SP
489 if (PL_op->op_type == OP_OR)
490 --SP;
a0d0e21e
LW
491 RETURNOP(cLOGOP->op_other);
492 }
493}
494
25a55bd7 495PP(pp_defined)
c963b151 496{
97aff369 497 dVAR; dSP;
eb578fdb 498 SV* sv;
6136c704 499 bool defined;
25a55bd7 500 const int op_type = PL_op->op_type;
ea5195b7 501 const bool is_dor = (op_type == OP_DOR || op_type == OP_DORASSIGN);
c963b151 502
6136c704 503 if (is_dor) {
f410a211 504 PERL_ASYNC_CHECK();
25a55bd7
SP
505 sv = TOPs;
506 if (!sv || !SvANY(sv)) {
2bd49cfc
NC
507 if (op_type == OP_DOR)
508 --SP;
25a55bd7
SP
509 RETURNOP(cLOGOP->op_other);
510 }
b7c44293
RGS
511 }
512 else {
513 /* OP_DEFINED */
25a55bd7
SP
514 sv = POPs;
515 if (!sv || !SvANY(sv))
516 RETPUSHNO;
b7c44293 517 }
25a55bd7 518
6136c704 519 defined = FALSE;
c963b151
BD
520 switch (SvTYPE(sv)) {
521 case SVt_PVAV:
522 if (AvMAX(sv) >= 0 || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 523 defined = TRUE;
c963b151
BD
524 break;
525 case SVt_PVHV:
526 if (HvARRAY(sv) || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 527 defined = TRUE;
c963b151
BD
528 break;
529 case SVt_PVCV:
530 if (CvROOT(sv) || CvXSUB(sv))
25a55bd7 531 defined = TRUE;
c963b151
BD
532 break;
533 default:
5b295bef 534 SvGETMAGIC(sv);
c963b151 535 if (SvOK(sv))
25a55bd7 536 defined = TRUE;
6136c704 537 break;
c963b151 538 }
6136c704
AL
539
540 if (is_dor) {
c960fc3b
SP
541 if(defined)
542 RETURN;
543 if(op_type == OP_DOR)
544 --SP;
25a55bd7 545 RETURNOP(cLOGOP->op_other);
25a55bd7 546 }
d9aa96a4
SP
547 /* assuming OP_DEFINED */
548 if(defined)
549 RETPUSHYES;
550 RETPUSHNO;
c963b151
BD
551}
552
a0d0e21e
LW
553PP(pp_add)
554{
800401ee 555 dVAR; dSP; dATARGET; bool useleft; SV *svl, *svr;
6f1401dc
DM
556 tryAMAGICbin_MG(add_amg, AMGf_assign|AMGf_numeric);
557 svr = TOPs;
558 svl = TOPm1s;
559
800401ee 560 useleft = USE_LEFT(svl);
28e5dec8
JH
561#ifdef PERL_PRESERVE_IVUV
562 /* We must see if we can perform the addition with integers if possible,
563 as the integer code detects overflow while the NV code doesn't.
564 If either argument hasn't had a numeric conversion yet attempt to get
565 the IV. It's important to do this now, rather than just assuming that
566 it's not IOK as a PV of "9223372036854775806" may not take well to NV
567 addition, and an SV which is NOK, NV=6.0 ought to be coerced to
568 integer in case the second argument is IV=9223372036854775806
569 We can (now) rely on sv_2iv to do the right thing, only setting the
570 public IOK flag if the value in the NV (or PV) slot is truly integer.
571
572 A side effect is that this also aggressively prefers integer maths over
7dca457a
NC
573 fp maths for integer values.
574
a00b5bd3 575 How to detect overflow?
7dca457a
NC
576
577 C 99 section 6.2.6.1 says
578
579 The range of nonnegative values of a signed integer type is a subrange
580 of the corresponding unsigned integer type, and the representation of
581 the same value in each type is the same. A computation involving
582 unsigned operands can never overflow, because a result that cannot be
583 represented by the resulting unsigned integer type is reduced modulo
584 the number that is one greater than the largest value that can be
585 represented by the resulting type.
586
587 (the 9th paragraph)
588
589 which I read as "unsigned ints wrap."
590
591 signed integer overflow seems to be classed as "exception condition"
592
593 If an exceptional condition occurs during the evaluation of an
594 expression (that is, if the result is not mathematically defined or not
595 in the range of representable values for its type), the behavior is
596 undefined.
597
598 (6.5, the 5th paragraph)
599
600 I had assumed that on 2s complement machines signed arithmetic would
601 wrap, hence coded pp_add and pp_subtract on the assumption that
602 everything perl builds on would be happy. After much wailing and
603 gnashing of teeth it would seem that irix64 knows its ANSI spec well,
604 knows that it doesn't need to, and doesn't. Bah. Anyway, the all-
605 unsigned code below is actually shorter than the old code. :-)
606 */
607
01f91bf2 608 if (SvIV_please_nomg(svr)) {
28e5dec8
JH
609 /* Unless the left argument is integer in range we are going to have to
610 use NV maths. Hence only attempt to coerce the right argument if
611 we know the left is integer. */
eb578fdb 612 UV auv = 0;
9c5ffd7c 613 bool auvok = FALSE;
7dca457a
NC
614 bool a_valid = 0;
615
28e5dec8 616 if (!useleft) {
7dca457a
NC
617 auv = 0;
618 a_valid = auvok = 1;
619 /* left operand is undef, treat as zero. + 0 is identity,
620 Could SETi or SETu right now, but space optimise by not adding
621 lots of code to speed up what is probably a rarish case. */
622 } else {
623 /* Left operand is defined, so is it IV? */
01f91bf2 624 if (SvIV_please_nomg(svl)) {
800401ee
JH
625 if ((auvok = SvUOK(svl)))
626 auv = SvUVX(svl);
7dca457a 627 else {
eb578fdb 628 const IV aiv = SvIVX(svl);
7dca457a
NC
629 if (aiv >= 0) {
630 auv = aiv;
631 auvok = 1; /* Now acting as a sign flag. */
632 } else { /* 2s complement assumption for IV_MIN */
633 auv = (UV)-aiv;
634 }
635 }
636 a_valid = 1;
28e5dec8
JH
637 }
638 }
7dca457a
NC
639 if (a_valid) {
640 bool result_good = 0;
641 UV result;
eb578fdb 642 UV buv;
800401ee 643 bool buvok = SvUOK(svr);
a00b5bd3 644
7dca457a 645 if (buvok)
800401ee 646 buv = SvUVX(svr);
7dca457a 647 else {
eb578fdb 648 const IV biv = SvIVX(svr);
7dca457a
NC
649 if (biv >= 0) {
650 buv = biv;
651 buvok = 1;
652 } else
653 buv = (UV)-biv;
654 }
655 /* ?uvok if value is >= 0. basically, flagged as UV if it's +ve,
602f51c4 656 else "IV" now, independent of how it came in.
7dca457a
NC
657 if a, b represents positive, A, B negative, a maps to -A etc
658 a + b => (a + b)
659 A + b => -(a - b)
660 a + B => (a - b)
661 A + B => -(a + b)
662 all UV maths. negate result if A negative.
663 add if signs same, subtract if signs differ. */
664
665 if (auvok ^ buvok) {
666 /* Signs differ. */
667 if (auv >= buv) {
668 result = auv - buv;
669 /* Must get smaller */
670 if (result <= auv)
671 result_good = 1;
672 } else {
673 result = buv - auv;
674 if (result <= buv) {
675 /* result really should be -(auv-buv). as its negation
676 of true value, need to swap our result flag */
677 auvok = !auvok;
678 result_good = 1;
28e5dec8
JH
679 }
680 }
7dca457a
NC
681 } else {
682 /* Signs same */
683 result = auv + buv;
684 if (result >= auv)
685 result_good = 1;
686 }
687 if (result_good) {
688 SP--;
689 if (auvok)
28e5dec8 690 SETu( result );
7dca457a
NC
691 else {
692 /* Negate result */
693 if (result <= (UV)IV_MIN)
694 SETi( -(IV)result );
695 else {
696 /* result valid, but out of range for IV. */
697 SETn( -(NV)result );
28e5dec8
JH
698 }
699 }
7dca457a
NC
700 RETURN;
701 } /* Overflow, drop through to NVs. */
28e5dec8
JH
702 }
703 }
704#endif
a0d0e21e 705 {
6f1401dc 706 NV value = SvNV_nomg(svr);
4efa5a16 707 (void)POPs;
28e5dec8
JH
708 if (!useleft) {
709 /* left operand is undef, treat as zero. + 0.0 is identity. */
710 SETn(value);
711 RETURN;
712 }
6f1401dc 713 SETn( value + SvNV_nomg(svl) );
28e5dec8 714 RETURN;
a0d0e21e
LW
715 }
716}
717
718PP(pp_aelemfast)
719{
97aff369 720 dVAR; dSP;
93bad3fd 721 AV * const av = PL_op->op_type == OP_AELEMFAST_LEX
8f878375 722 ? MUTABLE_AV(PAD_SV(PL_op->op_targ)) : GvAVn(cGVOP_gv);
a3b680e6 723 const U32 lval = PL_op->op_flags & OPf_MOD;
0bd48802 724 SV** const svp = av_fetch(av, PL_op->op_private, lval);
3280af22 725 SV *sv = (svp ? *svp : &PL_sv_undef);
6ff81951 726 EXTEND(SP, 1);
39cf747a 727 if (!lval && SvRMAGICAL(av) && SvGMAGICAL(sv)) /* see note in pp_helem() */
fd69380d 728 mg_get(sv);
be6c24e0 729 PUSHs(sv);
a0d0e21e
LW
730 RETURN;
731}
732
733PP(pp_join)
734{
97aff369 735 dVAR; dSP; dMARK; dTARGET;
a0d0e21e
LW
736 MARK++;
737 do_join(TARG, *MARK, MARK, SP);
738 SP = MARK;
739 SETs(TARG);
740 RETURN;
741}
742
743PP(pp_pushre)
744{
97aff369 745 dVAR; dSP;
44a8e56a
PP
746#ifdef DEBUGGING
747 /*
748 * We ass_u_me that LvTARGOFF() comes first, and that two STRLENs
749 * will be enough to hold an OP*.
750 */
c4420975 751 SV* const sv = sv_newmortal();
44a8e56a
PP
752 sv_upgrade(sv, SVt_PVLV);
753 LvTYPE(sv) = '/';
533c011a 754 Copy(&PL_op, &LvTARGOFF(sv), 1, OP*);
44a8e56a
PP
755 XPUSHs(sv);
756#else
ad64d0ec 757 XPUSHs(MUTABLE_SV(PL_op));
44a8e56a 758#endif
a0d0e21e
LW
759 RETURN;
760}
761
762/* Oversized hot code. */
763
764PP(pp_print)
765{
27da23d5 766 dVAR; dSP; dMARK; dORIGMARK;
eb578fdb 767 PerlIO *fp;
236988e4 768 MAGIC *mg;
159b6efe
NC
769 GV * const gv
770 = (PL_op->op_flags & OPf_STACKED) ? MUTABLE_GV(*++MARK) : PL_defoutgv;
9c9f25b8 771 IO *io = GvIO(gv);
5b468f54 772
9c9f25b8 773 if (io
ad64d0ec 774 && (mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar)))
5b468f54 775 {
01bb7c6d 776 had_magic:
68dc0745 777 if (MARK == ORIGMARK) {
1c846c1f 778 /* If using default handle then we need to make space to
a60c0954
NIS
779 * pass object as 1st arg, so move other args up ...
780 */
4352c267 781 MEXTEND(SP, 1);
68dc0745
PP
782 ++MARK;
783 Move(MARK, MARK + 1, (SP - MARK) + 1, SV*);
784 ++SP;
785 }
3e0cb5de 786 return Perl_tied_method(aTHX_ SV_CONST(PRINT), mark - 1, MUTABLE_SV(io),
94bc412f
NC
787 mg,
788 (G_SCALAR | TIED_METHOD_ARGUMENTS_ON_STACK
789 | (PL_op->op_type == OP_SAY
790 ? TIED_METHOD_SAY : 0)), sp - mark);
236988e4 791 }
9c9f25b8 792 if (!io) {
68b590d9 793 if ( gv && GvEGVx(gv) && (io = GvIO(GvEGV(gv)))
ad64d0ec 794 && (mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar)))
01bb7c6d 795 goto had_magic;
51087808 796 report_evil_fh(gv);
93189314 797 SETERRNO(EBADF,RMS_IFI);
a0d0e21e
LW
798 goto just_say_no;
799 }
800 else if (!(fp = IoOFP(io))) {
7716c5c5
NC
801 if (IoIFP(io))
802 report_wrongway_fh(gv, '<');
51087808 803 else
7716c5c5 804 report_evil_fh(gv);
93189314 805 SETERRNO(EBADF,IoIFP(io)?RMS_FAC:RMS_IFI);
a0d0e21e
LW
806 goto just_say_no;
807 }
808 else {
e23d9e2f 809 SV * const ofs = GvSV(PL_ofsgv); /* $, */
a0d0e21e 810 MARK++;
e23d9e2f 811 if (ofs && (SvGMAGICAL(ofs) || SvOK(ofs))) {
a0d0e21e
LW
812 while (MARK <= SP) {
813 if (!do_print(*MARK, fp))
814 break;
815 MARK++;
816 if (MARK <= SP) {
e23d9e2f
CS
817 /* don't use 'ofs' here - it may be invalidated by magic callbacks */
818 if (!do_print(GvSV(PL_ofsgv), fp)) {
a0d0e21e
LW
819 MARK--;
820 break;
821 }
822 }
823 }
824 }
825 else {
826 while (MARK <= SP) {
827 if (!do_print(*MARK, fp))
828 break;
829 MARK++;
830 }
831 }
832 if (MARK <= SP)
833 goto just_say_no;
834 else {
cfc4a7da
GA
835 if (PL_op->op_type == OP_SAY) {
836 if (PerlIO_write(fp, "\n", 1) == 0 || PerlIO_error(fp))
837 goto just_say_no;
838 }
839 else if (PL_ors_sv && SvOK(PL_ors_sv))
7889fe52 840 if (!do_print(PL_ors_sv, fp)) /* $\ */
a0d0e21e
LW
841 goto just_say_no;
842
843 if (IoFLAGS(io) & IOf_FLUSH)
760ac839 844 if (PerlIO_flush(fp) == EOF)
a0d0e21e
LW
845 goto just_say_no;
846 }
847 }
848 SP = ORIGMARK;
e52fd6f4 849 XPUSHs(&PL_sv_yes);
a0d0e21e
LW
850 RETURN;
851
852 just_say_no:
853 SP = ORIGMARK;
e52fd6f4 854 XPUSHs(&PL_sv_undef);
a0d0e21e
LW
855 RETURN;
856}
857
858PP(pp_rv2av)
859{
97aff369 860 dVAR; dSP; dTOPss;
cde874ca 861 const I32 gimme = GIMME_V;
17ab7946
NC
862 static const char an_array[] = "an ARRAY";
863 static const char a_hash[] = "a HASH";
864 const bool is_pp_rv2av = PL_op->op_type == OP_RV2AV;
d83b45b8 865 const svtype type = is_pp_rv2av ? SVt_PVAV : SVt_PVHV;
a0d0e21e 866
9026059d 867 SvGETMAGIC(sv);
a0d0e21e 868 if (SvROK(sv)) {
93d7320b
DM
869 if (SvAMAGIC(sv)) {
870 sv = amagic_deref_call(sv, is_pp_rv2av ? to_av_amg : to_hv_amg);
93d7320b 871 }
17ab7946
NC
872 sv = SvRV(sv);
873 if (SvTYPE(sv) != type)
dcbac5bb 874 /* diag_listed_as: Not an ARRAY reference */
17ab7946 875 DIE(aTHX_ "Not %s reference", is_pp_rv2av ? an_array : a_hash);
3da99855
FC
876 else if (PL_op->op_flags & OPf_MOD
877 && PL_op->op_private & OPpLVAL_INTRO)
878 Perl_croak(aTHX_ "%s", PL_no_localize_ref);
a0d0e21e 879 }
9f527363 880 else if (SvTYPE(sv) != type) {
67955e0c 881 GV *gv;
1c846c1f 882
6e592b3a 883 if (!isGV_with_GP(sv)) {
dc3c76f8
NC
884 gv = Perl_softref2xv(aTHX_ sv, is_pp_rv2av ? an_array : a_hash,
885 type, &sp);
886 if (!gv)
887 RETURN;
35cd451c
GS
888 }
889 else {
159b6efe 890 gv = MUTABLE_GV(sv);
a0d0e21e 891 }
ad64d0ec 892 sv = is_pp_rv2av ? MUTABLE_SV(GvAVn(gv)) : MUTABLE_SV(GvHVn(gv));
533c011a 893 if (PL_op->op_private & OPpLVAL_INTRO)
ad64d0ec 894 sv = is_pp_rv2av ? MUTABLE_SV(save_ary(gv)) : MUTABLE_SV(save_hash(gv));
9f527363
FC
895 }
896 if (PL_op->op_flags & OPf_REF) {
17ab7946 897 SETs(sv);
a0d0e21e 898 RETURN;
9f527363
FC
899 }
900 else if (PL_op->op_private & OPpMAYBE_LVSUB) {
40c94d11
FC
901 const I32 flags = is_lvalue_sub();
902 if (flags && !(flags & OPpENTERSUB_INARGS)) {
cde874ca 903 if (gimme != G_ARRAY)
042560a6 904 goto croak_cant_return;
17ab7946 905 SETs(sv);
78f9721b 906 RETURN;
40c94d11 907 }
a0d0e21e
LW
908 }
909
17ab7946 910 if (is_pp_rv2av) {
502c6561 911 AV *const av = MUTABLE_AV(sv);
486ec47a 912 /* The guts of pp_rv2av, with no intending change to preserve history
17ab7946
NC
913 (until such time as we get tools that can do blame annotation across
914 whitespace changes. */
96913b52 915 if (gimme == G_ARRAY) {
d5524600
DM
916 SP--;
917 PUTBACK;
918 S_pushav(aTHX_ av);
919 SPAGAIN;
1c846c1f 920 }
96913b52
VP
921 else if (gimme == G_SCALAR) {
922 dTARGET;
923 const I32 maxarg = AvFILL(av) + 1;
924 SETi(maxarg);
93965878 925 }
17ab7946
NC
926 } else {
927 /* The guts of pp_rv2hv */
96913b52
VP
928 if (gimme == G_ARRAY) { /* array wanted */
929 *PL_stack_sp = sv;
981b7185 930 return Perl_do_kv(aTHX);
96913b52 931 }
c8fe3bdf 932 else if ((PL_op->op_private & OPpTRUEBOOL
adc42c31 933 || ( PL_op->op_private & OPpMAYBE_TRUEBOOL
c8fe3bdf
FC
934 && block_gimme() == G_VOID ))
935 && (!SvRMAGICAL(sv) || !mg_find(sv, PERL_MAGIC_tied)))
936 SETs(HvUSEDKEYS(sv) ? &PL_sv_yes : sv_2mortal(newSViv(0)));
96913b52
VP
937 else if (gimme == G_SCALAR) {
938 dTARGET;
939 TARG = Perl_hv_scalar(aTHX_ MUTABLE_HV(sv));
940 SPAGAIN;
941 SETTARG;
942 }
17ab7946 943 }
be85d344 944 RETURN;
042560a6
NC
945
946 croak_cant_return:
947 Perl_croak(aTHX_ "Can't return %s to lvalue scalar context",
948 is_pp_rv2av ? "array" : "hash");
77e217c6 949 RETURN;
a0d0e21e
LW
950}
951
10c8fecd 952STATIC void
fb8f4cf8 953S_do_oddball(pTHX_ SV **oddkey, SV **firstkey)
10c8fecd 954{
97aff369 955 dVAR;
7918f24d
NC
956
957 PERL_ARGS_ASSERT_DO_ODDBALL;
958
fb8f4cf8 959 if (*oddkey) {
6d822dc4 960 if (ckWARN(WARN_MISC)) {
a3b680e6 961 const char *err;
fb8f4cf8
RZ
962 if (oddkey == firstkey &&
963 SvROK(*oddkey) &&
964 (SvTYPE(SvRV(*oddkey)) == SVt_PVAV ||
965 SvTYPE(SvRV(*oddkey)) == SVt_PVHV))
10c8fecd 966 {
a3b680e6 967 err = "Reference found where even-sized list expected";
10c8fecd
GS
968 }
969 else
a3b680e6 970 err = "Odd number of elements in hash assignment";
f1f66076 971 Perl_warner(aTHX_ packWARN(WARN_MISC), "%s", err);
10c8fecd 972 }
6d822dc4 973
10c8fecd
GS
974 }
975}
976
a0d0e21e
LW
977PP(pp_aassign)
978{
27da23d5 979 dVAR; dSP;
3280af22
NIS
980 SV **lastlelem = PL_stack_sp;
981 SV **lastrelem = PL_stack_base + POPMARK;
982 SV **firstrelem = PL_stack_base + POPMARK + 1;
a0d0e21e
LW
983 SV **firstlelem = lastrelem + 1;
984
eb578fdb
KW
985 SV **relem;
986 SV **lelem;
a0d0e21e 987
eb578fdb
KW
988 SV *sv;
989 AV *ary;
a0d0e21e 990
54310121 991 I32 gimme;
a0d0e21e
LW
992 HV *hash;
993 I32 i;
994 int magic;
88e2091b 995 U32 lval = 0;
5637b936 996
3280af22 997 PL_delaymagic = DM_DELAY; /* catch simultaneous items */
ca65944e 998 gimme = GIMME_V;
88e2091b
RZ
999 if (gimme == G_ARRAY)
1000 lval = PL_op->op_flags & OPf_MOD || LVRET;
a0d0e21e
LW
1001
1002 /* If there's a common identifier on both sides we have to take
1003 * special care that assigning the identifier on the left doesn't
1004 * clobber a value on the right that's used later in the list.
acdea6f0 1005 * Don't bother if LHS is just an empty hash or array.
a0d0e21e 1006 */
acdea6f0
DM
1007
1008 if ( (PL_op->op_private & OPpASSIGN_COMMON)
1009 && (
1010 firstlelem != lastlelem
1011 || ! ((sv = *firstlelem))
1012 || SvMAGICAL(sv)
1013 || ! (SvTYPE(sv) == SVt_PVAV || SvTYPE(sv) == SVt_PVHV)
1014 || (SvTYPE(sv) == SVt_PVAV && AvFILL((AV*)sv) != -1)
1b95d04f 1015 || (SvTYPE(sv) == SVt_PVHV && HvUSEDKEYS((HV*)sv) != 0)
acdea6f0
DM
1016 )
1017 ) {
cc5e57d2 1018 EXTEND_MORTAL(lastrelem - firstrelem + 1);
10c8fecd 1019 for (relem = firstrelem; relem <= lastrelem; relem++) {
155aba94 1020 if ((sv = *relem)) {
a1f49e72 1021 TAINT_NOT; /* Each item is independent */
61e5f455
NC
1022
1023 /* Dear TODO test in t/op/sort.t, I love you.
1024 (It's relying on a panic, not a "semi-panic" from newSVsv()
1025 and then an assertion failure below.) */
1026 if (SvIS_FREED(sv)) {
1027 Perl_croak(aTHX_ "panic: attempt to copy freed scalar %p",
1028 (void*)sv);
1029 }
2203fb5a
FC
1030 /* Not newSVsv(), as it does not allow copy-on-write,
1031 resulting in wasteful copies. We need a second copy of
1032 a temp here, hence the SV_NOSTEAL. */
1033 *relem = sv_mortalcopy_flags(sv,SV_GMAGIC|SV_DO_COW_SVSETSV
1034 |SV_NOSTEAL);
a1f49e72 1035 }
10c8fecd 1036 }
a0d0e21e
LW
1037 }
1038
1039 relem = firstrelem;
1040 lelem = firstlelem;
4608196e
RGS
1041 ary = NULL;
1042 hash = NULL;
10c8fecd 1043
a0d0e21e 1044 while (lelem <= lastlelem) {
bbce6d69 1045 TAINT_NOT; /* Each item stands on its own, taintwise. */
a0d0e21e
LW
1046 sv = *lelem++;
1047 switch (SvTYPE(sv)) {
1048 case SVt_PVAV:
60edcf09 1049 ary = MUTABLE_AV(sv);
748a9306 1050 magic = SvMAGICAL(ary) != 0;
60edcf09
FC
1051 ENTER;
1052 SAVEFREESV(SvREFCNT_inc_simple_NN(sv));
a0d0e21e 1053 av_clear(ary);
7e42bd57 1054 av_extend(ary, lastrelem - relem);
a0d0e21e
LW
1055 i = 0;
1056 while (relem <= lastrelem) { /* gobble up all the rest */
5117ca91 1057 SV **didstore;
a0d0e21e 1058 assert(*relem);
18024492
FC
1059 SvGETMAGIC(*relem); /* before newSV, in case it dies */
1060 sv = newSV(0);
1061 sv_setsv_nomg(sv, *relem);
a0d0e21e 1062 *(relem++) = sv;
5117ca91
GS
1063 didstore = av_store(ary,i++,sv);
1064 if (magic) {
18024492
FC
1065 if (!didstore)
1066 sv_2mortal(sv);
8ef24240 1067 if (SvSMAGICAL(sv))
fb73857a 1068 mg_set(sv);
5117ca91 1069 }
bbce6d69 1070 TAINT_NOT;
a0d0e21e 1071 }
354b0578 1072 if (PL_delaymagic & DM_ARRAY_ISA)
ad64d0ec 1073 SvSETMAGIC(MUTABLE_SV(ary));
60edcf09 1074 LEAVE;
a0d0e21e 1075 break;
10c8fecd 1076 case SVt_PVHV: { /* normal hash */
a0d0e21e 1077 SV *tmpstr;
1c4ea384
RZ
1078 int odd;
1079 int duplicates = 0;
45960564 1080 SV** topelem = relem;
1c4ea384 1081 SV **firsthashrelem = relem;
a0d0e21e 1082
60edcf09 1083 hash = MUTABLE_HV(sv);
748a9306 1084 magic = SvMAGICAL(hash) != 0;
1c4ea384
RZ
1085
1086 odd = ((lastrelem - firsthashrelem)&1)? 0 : 1;
1087 if ( odd ) {
fb8f4cf8 1088 do_oddball(lastrelem, firsthashrelem);
1d2b3927
HS
1089 /* we have firstlelem to reuse, it's not needed anymore
1090 */
1c4ea384
RZ
1091 *(lastrelem+1) = &PL_sv_undef;
1092 }
1093
60edcf09
FC
1094 ENTER;
1095 SAVEFREESV(SvREFCNT_inc_simple_NN(sv));
a0d0e21e 1096 hv_clear(hash);
1c4ea384 1097 while (relem < lastrelem+odd) { /* gobble up all the rest */
5117ca91 1098 HE *didstore;
1c4ea384 1099 assert(*relem);
632b9d6f
FC
1100 /* Copy the key if aassign is called in lvalue context,
1101 to avoid having the next op modify our rhs. Copy
1102 it also if it is gmagical, lest it make the
1103 hv_store_ent call below croak, leaking the value. */
1104 sv = lval || SvGMAGICAL(*relem)
1105 ? sv_mortalcopy(*relem)
1106 : *relem;
45960564 1107 relem++;
1c4ea384 1108 assert(*relem);
632b9d6f
FC
1109 SvGETMAGIC(*relem);
1110 tmpstr = newSV(0);
1111 sv_setsv_nomg(tmpstr,*relem++); /* value */
a88bf2bc 1112 if (gimme == G_ARRAY) {
45960564
DM
1113 if (hv_exists_ent(hash, sv, 0))
1114 /* key overwrites an existing entry */
1115 duplicates += 2;
a88bf2bc 1116 else {
45960564 1117 /* copy element back: possibly to an earlier
1d2b3927
HS
1118 * stack location if we encountered dups earlier,
1119 * possibly to a later stack location if odd */
45960564
DM
1120 *topelem++ = sv;
1121 *topelem++ = tmpstr;
1122 }
1123 }
5117ca91 1124 didstore = hv_store_ent(hash,sv,tmpstr,0);
632b9d6f
FC
1125 if (magic) {
1126 if (!didstore) sv_2mortal(tmpstr);
1127 SvSETMAGIC(tmpstr);
1128 }
bbce6d69 1129 TAINT_NOT;
8e07c86e 1130 }
60edcf09 1131 LEAVE;
1c4ea384
RZ
1132 if (duplicates && gimme == G_ARRAY) {
1133 /* at this point we have removed the duplicate key/value
1134 * pairs from the stack, but the remaining values may be
1135 * wrong; i.e. with (a 1 a 2 b 3) on the stack we've removed
1136 * the (a 2), but the stack now probably contains
1137 * (a <freed> b 3), because { hv_save(a,1); hv_save(a,2) }
1138 * obliterates the earlier key. So refresh all values. */
1139 lastrelem -= duplicates;
1140 relem = firsthashrelem;
1141 while (relem < lastrelem+odd) {
1142 HE *he;
1143 he = hv_fetch_ent(hash, *relem++, 0, 0);
1144 *relem++ = (he ? HeVAL(he) : &PL_sv_undef);
1145 }
1146 }
1147 if (odd && gimme == G_ARRAY) lastrelem++;
a0d0e21e
LW
1148 }
1149 break;
1150 default:
6fc92669
GS
1151 if (SvIMMORTAL(sv)) {
1152 if (relem <= lastrelem)
1153 relem++;
1154 break;
a0d0e21e
LW
1155 }
1156 if (relem <= lastrelem) {
1c70fb82
FC
1157 if (
1158 SvTEMP(sv) && !SvSMAGICAL(sv) && SvREFCNT(sv) == 1 &&
1159 (!isGV_with_GP(sv) || SvFAKE(sv)) && ckWARN(WARN_MISC)
1160 )
1161 Perl_warner(aTHX_
1162 packWARN(WARN_MISC),
1163 "Useless assignment to a temporary"
1164 );
a0d0e21e
LW
1165 sv_setsv(sv, *relem);
1166 *(relem++) = sv;
1167 }
1168 else
3280af22 1169 sv_setsv(sv, &PL_sv_undef);
8ef24240 1170 SvSETMAGIC(sv);
a0d0e21e
LW
1171 break;
1172 }
1173 }
3280af22 1174 if (PL_delaymagic & ~DM_DELAY) {
985213f2 1175 /* Will be used to set PL_tainting below */
dfff4baf
BF
1176 Uid_t tmp_uid = PerlProc_getuid();
1177 Uid_t tmp_euid = PerlProc_geteuid();
1178 Gid_t tmp_gid = PerlProc_getgid();
1179 Gid_t tmp_egid = PerlProc_getegid();
985213f2 1180
3280af22 1181 if (PL_delaymagic & DM_UID) {
a0d0e21e 1182#ifdef HAS_SETRESUID
985213f2
AB
1183 (void)setresuid((PL_delaymagic & DM_RUID) ? PL_delaymagic_uid : (Uid_t)-1,
1184 (PL_delaymagic & DM_EUID) ? PL_delaymagic_euid : (Uid_t)-1,
fb934a90 1185 (Uid_t)-1);
56febc5e
AD
1186#else
1187# ifdef HAS_SETREUID
985213f2
AB
1188 (void)setreuid((PL_delaymagic & DM_RUID) ? PL_delaymagic_uid : (Uid_t)-1,
1189 (PL_delaymagic & DM_EUID) ? PL_delaymagic_euid : (Uid_t)-1);
56febc5e
AD
1190# else
1191# ifdef HAS_SETRUID
b28d0864 1192 if ((PL_delaymagic & DM_UID) == DM_RUID) {
985213f2 1193 (void)setruid(PL_delaymagic_uid);
b28d0864 1194 PL_delaymagic &= ~DM_RUID;
a0d0e21e 1195 }
56febc5e
AD
1196# endif /* HAS_SETRUID */
1197# ifdef HAS_SETEUID
b28d0864 1198 if ((PL_delaymagic & DM_UID) == DM_EUID) {
985213f2 1199 (void)seteuid(PL_delaymagic_euid);
b28d0864 1200 PL_delaymagic &= ~DM_EUID;
a0d0e21e 1201 }
56febc5e 1202# endif /* HAS_SETEUID */
b28d0864 1203 if (PL_delaymagic & DM_UID) {
985213f2 1204 if (PL_delaymagic_uid != PL_delaymagic_euid)
cea2e8a9 1205 DIE(aTHX_ "No setreuid available");
985213f2 1206 (void)PerlProc_setuid(PL_delaymagic_uid);
a0d0e21e 1207 }
56febc5e
AD
1208# endif /* HAS_SETREUID */
1209#endif /* HAS_SETRESUID */
985213f2
AB
1210 tmp_uid = PerlProc_getuid();
1211 tmp_euid = PerlProc_geteuid();
a0d0e21e 1212 }
3280af22 1213 if (PL_delaymagic & DM_GID) {
a0d0e21e 1214#ifdef HAS_SETRESGID
985213f2
AB
1215 (void)setresgid((PL_delaymagic & DM_RGID) ? PL_delaymagic_gid : (Gid_t)-1,
1216 (PL_delaymagic & DM_EGID) ? PL_delaymagic_egid : (Gid_t)-1,
fb934a90 1217 (Gid_t)-1);
56febc5e
AD
1218#else
1219# ifdef HAS_SETREGID
985213f2
AB
1220 (void)setregid((PL_delaymagic & DM_RGID) ? PL_delaymagic_gid : (Gid_t)-1,
1221 (PL_delaymagic & DM_EGID) ? PL_delaymagic_egid : (Gid_t)-1);
56febc5e
AD
1222# else
1223# ifdef HAS_SETRGID
b28d0864 1224 if ((PL_delaymagic & DM_GID) == DM_RGID) {
985213f2 1225 (void)setrgid(PL_delaymagic_gid);
b28d0864 1226 PL_delaymagic &= ~DM_RGID;
a0d0e21e 1227 }
56febc5e
AD
1228# endif /* HAS_SETRGID */
1229# ifdef HAS_SETEGID
b28d0864 1230 if ((PL_delaymagic & DM_GID) == DM_EGID) {
985213f2 1231 (void)setegid(PL_delaymagic_egid);
b28d0864 1232 PL_delaymagic &= ~DM_EGID;
a0d0e21e 1233 }
56febc5e 1234# endif /* HAS_SETEGID */
b28d0864 1235 if (PL_delaymagic & DM_GID) {
985213f2 1236 if (PL_delaymagic_gid != PL_delaymagic_egid)
cea2e8a9 1237 DIE(aTHX_ "No setregid available");
985213f2 1238 (void)PerlProc_setgid(PL_delaymagic_gid);
a0d0e21e 1239 }
56febc5e
AD
1240# endif /* HAS_SETREGID */
1241#endif /* HAS_SETRESGID */
985213f2
AB
1242 tmp_gid = PerlProc_getgid();
1243 tmp_egid = PerlProc_getegid();
a0d0e21e 1244 }
284167a5 1245 TAINTING_set( TAINTING_get | (tmp_uid && (tmp_euid != tmp_uid || tmp_egid != tmp_gid)) );
9a9b5ec9
DM
1246#ifdef NO_TAINT_SUPPORT
1247 PERL_UNUSED_VAR(tmp_uid);
1248 PERL_UNUSED_VAR(tmp_euid);
1249 PERL_UNUSED_VAR(tmp_gid);
1250 PERL_UNUSED_VAR(tmp_egid);
1251#endif
a0d0e21e 1252 }
3280af22 1253 PL_delaymagic = 0;
54310121 1254
54310121
PP
1255 if (gimme == G_VOID)
1256 SP = firstrelem - 1;
1257 else if (gimme == G_SCALAR) {
1258 dTARGET;
1259 SP = firstrelem;
231cbeb2 1260 SETi(lastrelem - firstrelem + 1);
54310121
PP
1261 }
1262 else {
1c4ea384 1263 if (ary || hash)
1d2b3927
HS
1264 /* note that in this case *firstlelem may have been overwritten
1265 by sv_undef in the odd hash case */
a0d0e21e 1266 SP = lastrelem;
1c4ea384 1267 else {
a0d0e21e 1268 SP = firstrelem + (lastlelem - firstlelem);
1c4ea384
RZ
1269 lelem = firstlelem + (relem - firstrelem);
1270 while (relem <= SP)
1271 *relem++ = (lelem <= lastlelem) ? *lelem++ : &PL_sv_undef;
1272 }
a0d0e21e 1273 }
08aeb9f7 1274
54310121 1275 RETURN;
a0d0e21e
LW
1276}
1277
8782bef2
GB
1278PP(pp_qr)
1279{
97aff369 1280 dVAR; dSP;
eb578fdb 1281 PMOP * const pm = cPMOP;
fe578d7f 1282 REGEXP * rx = PM_GETRE(pm);
10599a69 1283 SV * const pkg = rx ? CALLREG_PACKAGE(rx) : NULL;
c4420975 1284 SV * const rv = sv_newmortal();
d63c20f2
DM
1285 CV **cvp;
1286 CV *cv;
288b8c02
NC
1287
1288 SvUPGRADE(rv, SVt_IV);
c2123ae3
NC
1289 /* For a subroutine describing itself as "This is a hacky workaround" I'm
1290 loathe to use it here, but it seems to be the right fix. Or close.
1291 The key part appears to be that it's essential for pp_qr to return a new
1292 object (SV), which implies that there needs to be an effective way to
1293 generate a new SV from the existing SV that is pre-compiled in the
1294 optree. */
1295 SvRV_set(rv, MUTABLE_SV(reg_temp_copy(NULL, rx)));
288b8c02
NC
1296 SvROK_on(rv);
1297
8d919b0a 1298 cvp = &( ReANY((REGEXP *)SvRV(rv))->qr_anoncv);
d63c20f2
DM
1299 if ((cv = *cvp) && CvCLONE(*cvp)) {
1300 *cvp = cv_clone(cv);
fc2b2dca 1301 SvREFCNT_dec_NN(cv);
d63c20f2
DM
1302 }
1303
288b8c02 1304 if (pkg) {
f815daf2 1305 HV *const stash = gv_stashsv(pkg, GV_ADD);
fc2b2dca 1306 SvREFCNT_dec_NN(pkg);
288b8c02
NC
1307 (void)sv_bless(rv, stash);
1308 }
1309
284167a5 1310 if (RX_ISTAINTED(rx)) {
e08e52cf 1311 SvTAINTED_on(rv);
9274aefd
DM
1312 SvTAINTED_on(SvRV(rv));
1313 }
c8c13c22 1314 XPUSHs(rv);
1315 RETURN;
8782bef2
GB
1316}
1317
a0d0e21e
LW
1318PP(pp_match)
1319{
97aff369 1320 dVAR; dSP; dTARG;
eb578fdb 1321 PMOP *pm = cPMOP;
d65afb4b 1322 PMOP *dynpm = pm;
eb578fdb 1323 const char *s;
5c144d81 1324 const char *strend;
0e0b3e82 1325 I32 curpos = 0; /* initial pos() or current $+[0] */
a0d0e21e 1326 I32 global;
7fadf4a7 1327 U8 r_flags = 0;
5c144d81 1328 const char *truebase; /* Start of string */
eb578fdb 1329 REGEXP *rx = PM_GETRE(pm);
b3eb6a9b 1330 bool rxtainted;
a3b680e6 1331 const I32 gimme = GIMME;
a0d0e21e 1332 STRLEN len;
a3b680e6 1333 const I32 oldsave = PL_savestack_ix;
e60df1fa 1334 I32 had_zerolen = 0;
b1422d62 1335 MAGIC *mg = NULL;
a0d0e21e 1336
533c011a 1337 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 1338 TARG = POPs;
59f00321
RGS
1339 else if (PL_op->op_private & OPpTARGET_MY)
1340 GETTARGET;
a0d0e21e 1341 else {
54b9620d 1342 TARG = DEFSV;
a0d0e21e
LW
1343 EXTEND(SP,1);
1344 }
d9f424b2 1345
c277df42 1346 PUTBACK; /* EVAL blocks need stack_sp. */
69dc4b30
FC
1347 /* Skip get-magic if this is a qr// clone, because regcomp has
1348 already done it. */
f1d31338 1349 truebase = ReANY(rx)->mother_re
69dc4b30
FC
1350 ? SvPV_nomg_const(TARG, len)
1351 : SvPV_const(TARG, len);
f1d31338 1352 if (!truebase)
2269b42e 1353 DIE(aTHX_ "panic: pp_match");
f1d31338 1354 strend = truebase + len;
284167a5
SM
1355 rxtainted = (RX_ISTAINTED(rx) ||
1356 (TAINT_get && (pm->op_pmflags & PMf_RETAINT)));
9212bbba 1357 TAINT_NOT;
a0d0e21e 1358
6c864ec2 1359 /* We need to know this in case we fail out early - pos() must be reset */
de0df3c0
MH
1360 global = dynpm->op_pmflags & PMf_GLOBAL;
1361
d65afb4b 1362 /* PMdf_USED is set after a ?? matches once */
c737faaf
YO
1363 if (
1364#ifdef USE_ITHREADS
1365 SvREADONLY(PL_regex_pad[pm->op_pmoffset])
1366#else
1367 pm->op_pmflags & PMf_USED
1368#endif
1369 ) {
e5dc5375 1370 DEBUG_r(PerlIO_printf(Perl_debug_log, "?? already matched once"));
de0df3c0 1371 goto nope;
a0d0e21e
LW
1372 }
1373
7e313637
FC
1374 /* empty pattern special-cased to use last successful pattern if
1375 possible, except for qr// */
8d919b0a 1376 if (!ReANY(rx)->mother_re && !RX_PRELEN(rx)
7e313637 1377 && PL_curpm) {
3280af22 1378 pm = PL_curpm;
aaa362c4 1379 rx = PM_GETRE(pm);
a0d0e21e 1380 }
d65afb4b 1381
e5dc5375
KW
1382 if (RX_MINLEN(rx) > (I32)len) {
1383 DEBUG_r(PerlIO_printf(Perl_debug_log, "String shorter than min possible regex match\n"));
de0df3c0 1384 goto nope;
e5dc5375 1385 }
c277df42 1386
8ef97b0e 1387 /* get pos() if //g */
de0df3c0 1388 if (global) {
b1422d62 1389 mg = mg_find_mglob(TARG);
8ef97b0e
DM
1390 if (mg && mg->mg_len >= 0) {
1391 curpos = mg->mg_len;
1392 /* last time pos() was set, it was zero-length match */
1393 if (mg->mg_flags & MGf_MINMATCH)
1394 had_zerolen = 1;
1395 }
a0d0e21e 1396 }
8ef97b0e 1397
6e240d0b 1398#ifdef PERL_SAWAMPERSAND
a41aa44d 1399 if ( RX_NPARENS(rx)
6502e081 1400 || PL_sawampersand
6502e081 1401 || (RX_EXTFLAGS(rx) & (RXf_EVAL_SEEN|RXf_PMf_KEEPCOPY))
5b0e71e9 1402 || (dynpm->op_pmflags & PMf_KEEPCOPY)
6e240d0b
FC
1403 )
1404#endif
1405 {
6502e081
DM
1406 r_flags |= (REXEC_COPY_STR|REXEC_COPY_SKIP_PRE);
1407 /* in @a =~ /(.)/g, we iterate multiple times, but copy the buffer
1408 * only on the first iteration. Therefore we need to copy $' as well
1409 * as $&, to make the rest of the string available for captures in
1410 * subsequent iterations */
1411 if (! (global && gimme == G_ARRAY))
1412 r_flags |= REXEC_COPY_SKIP_POST;
1413 };
5b0e71e9
DM
1414#ifdef PERL_SAWAMPERSAND
1415 if (dynpm->op_pmflags & PMf_KEEPCOPY)
1416 /* handle KEEPCOPY in pmop but not rx, eg $r=qr/a/; /$r/p */
1417 r_flags &= ~(REXEC_COPY_SKIP_PRE|REXEC_COPY_SKIP_POST);
1418#endif
22e551b9 1419
f1d31338
DM
1420 s = truebase;
1421
d7be1480 1422 play_it_again:
985afbc1 1423 if (global)
03c83e26 1424 s = truebase + curpos;
f722798b 1425
77da2310 1426 if (!CALLREGEXEC(rx, (char*)s, (char *)strend, (char*)truebase,
03c83e26 1427 had_zerolen, TARG, NULL, r_flags))
03b6c93d 1428 goto nope;
77da2310
NC
1429
1430 PL_curpm = pm;
985afbc1 1431 if (dynpm->op_pmflags & PMf_ONCE)
c737faaf 1432#ifdef USE_ITHREADS
77da2310 1433 SvREADONLY_on(PL_regex_pad[dynpm->op_pmoffset]);
c737faaf 1434#else
77da2310 1435 dynpm->op_pmflags |= PMf_USED;
c737faaf 1436#endif
a0d0e21e 1437
72311751
GS
1438 if (rxtainted)
1439 RX_MATCH_TAINTED_on(rx);
1440 TAINT_IF(RX_MATCH_TAINTED(rx));
35c2ccc3
DM
1441
1442 /* update pos */
1443
1444 if (global && (gimme != G_ARRAY || (dynpm->op_pmflags & PMf_CONTINUE))) {
b1422d62 1445 if (!mg)
35c2ccc3 1446 mg = sv_magicext_mglob(TARG);
adf51885
DM
1447 mg->mg_len = RX_OFFS(rx)[0].end;
1448 if (RX_ZERO_LEN(rx))
1449 mg->mg_flags |= MGf_MINMATCH;
1450 else
1451 mg->mg_flags &= ~MGf_MINMATCH;
35c2ccc3
DM
1452 }
1453
bf9dff51
DM
1454 if ((!RX_NPARENS(rx) && !global) || gimme != G_ARRAY) {
1455 LEAVE_SCOPE(oldsave);
1456 RETPUSHYES;
1457 }
1458
88ab22af
DM
1459 /* push captures on stack */
1460
bf9dff51 1461 {
07bc277f 1462 const I32 nparens = RX_NPARENS(rx);
a3b680e6 1463 I32 i = (global && !nparens) ? 1 : 0;
a0d0e21e 1464
c277df42 1465 SPAGAIN; /* EVAL blocks could move the stack. */
ffc61ed2
JH
1466 EXTEND(SP, nparens + i);
1467 EXTEND_MORTAL(nparens + i);
1468 for (i = !i; i <= nparens; i++) {
a0d0e21e 1469 PUSHs(sv_newmortal());
07bc277f
NC
1470 if ((RX_OFFS(rx)[i].start != -1) && RX_OFFS(rx)[i].end != -1 ) {
1471 const I32 len = RX_OFFS(rx)[i].end - RX_OFFS(rx)[i].start;
f1d31338 1472 const char * const s = RX_OFFS(rx)[i].start + truebase;
07bc277f 1473 if (RX_OFFS(rx)[i].end < 0 || RX_OFFS(rx)[i].start < 0 ||
290deeac 1474 len < 0 || len > strend - s)
5637ef5b
NC
1475 DIE(aTHX_ "panic: pp_match start/end pointers, i=%ld, "
1476 "start=%ld, end=%ld, s=%p, strend=%p, len=%"UVuf,
1477 (long) i, (long) RX_OFFS(rx)[i].start,
1478 (long)RX_OFFS(rx)[i].end, s, strend, (UV) len);
a0d0e21e 1479 sv_setpvn(*SP, s, len);
cce850e4 1480 if (DO_UTF8(TARG) && is_utf8_string((U8*)s, len))
a197cbdd 1481 SvUTF8_on(*SP);
a0d0e21e
LW
1482 }
1483 }
1484 if (global) {
0e0b3e82 1485 curpos = (UV)RX_OFFS(rx)[0].end;
03c83e26 1486 had_zerolen = RX_ZERO_LEN(rx);
c277df42 1487 PUTBACK; /* EVAL blocks may use stack */
cf93c79d 1488 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
1489 goto play_it_again;
1490 }
4633a7c4 1491 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1492 RETURN;
1493 }
88ab22af 1494 /* NOTREACHED */
a0d0e21e
LW
1495
1496nope:
d65afb4b 1497 if (global && !(dynpm->op_pmflags & PMf_CONTINUE)) {
b1422d62
DM
1498 if (!mg)
1499 mg = mg_find_mglob(TARG);
1500 if (mg)
1501 mg->mg_len = -1;
a0d0e21e 1502 }
4633a7c4 1503 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1504 if (gimme == G_ARRAY)
1505 RETURN;
1506 RETPUSHNO;
1507}
1508
1509OP *
864dbfa3 1510Perl_do_readline(pTHX)
a0d0e21e 1511{
27da23d5 1512 dVAR; dSP; dTARGETSTACKED;
eb578fdb 1513 SV *sv;
a0d0e21e
LW
1514 STRLEN tmplen = 0;
1515 STRLEN offset;
760ac839 1516 PerlIO *fp;
eb578fdb
KW
1517 IO * const io = GvIO(PL_last_in_gv);
1518 const I32 type = PL_op->op_type;
a3b680e6 1519 const I32 gimme = GIMME_V;
a0d0e21e 1520
6136c704 1521 if (io) {
50db69d8 1522 const MAGIC *const mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar);
6136c704 1523 if (mg) {
3e0cb5de 1524 Perl_tied_method(aTHX_ SV_CONST(READLINE), SP, MUTABLE_SV(io), mg, gimme, 0);
6136c704 1525 if (gimme == G_SCALAR) {
50db69d8
NC
1526 SPAGAIN;
1527 SvSetSV_nosteal(TARG, TOPs);
1528 SETTARG;
6136c704 1529 }
50db69d8 1530 return NORMAL;
0b7c7b4f 1531 }
e79b0511 1532 }
4608196e 1533 fp = NULL;
a0d0e21e
LW
1534 if (io) {
1535 fp = IoIFP(io);
1536 if (!fp) {
1537 if (IoFLAGS(io) & IOf_ARGV) {
1538 if (IoFLAGS(io) & IOf_START) {
a0d0e21e 1539 IoLINES(io) = 0;
3280af22 1540 if (av_len(GvAVn(PL_last_in_gv)) < 0) {
1d7c1841 1541 IoFLAGS(io) &= ~IOf_START;
4608196e 1542 do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,NULL);
4bac9ae4 1543 SvTAINTED_off(GvSVn(PL_last_in_gv)); /* previous tainting irrelevant */
76f68e9b 1544 sv_setpvs(GvSVn(PL_last_in_gv), "-");
3280af22 1545 SvSETMAGIC(GvSV(PL_last_in_gv));
a2008d6d
GS
1546 fp = IoIFP(io);
1547 goto have_fp;
a0d0e21e
LW
1548 }
1549 }
3280af22 1550 fp = nextargv(PL_last_in_gv);
a0d0e21e 1551 if (!fp) { /* Note: fp != IoIFP(io) */
3280af22 1552 (void)do_close(PL_last_in_gv, FALSE); /* now it does*/
a0d0e21e
LW
1553 }
1554 }
0d44d22b
NC
1555 else if (type == OP_GLOB)
1556 fp = Perl_start_glob(aTHX_ POPs, io);
a0d0e21e
LW
1557 }
1558 else if (type == OP_GLOB)
1559 SP--;
7716c5c5 1560 else if (IoTYPE(io) == IoTYPE_WRONLY) {
a5390457 1561 report_wrongway_fh(PL_last_in_gv, '>');
a00b5bd3 1562 }
a0d0e21e
LW
1563 }
1564 if (!fp) {
041457d9
DM
1565 if ((!io || !(IoFLAGS(io) & IOf_START))
1566 && ckWARN2(WARN_GLOB, WARN_CLOSED))
1567 {
3f4520fe 1568 if (type == OP_GLOB)
63922903 1569 Perl_ck_warner_d(aTHX_ packWARN(WARN_GLOB),
af8c498a
GS
1570 "glob failed (can't start child: %s)",
1571 Strerror(errno));
69282e91 1572 else
831e4cc3 1573 report_evil_fh(PL_last_in_gv);
3f4520fe 1574 }
54310121 1575 if (gimme == G_SCALAR) {
79628082 1576 /* undef TARG, and push that undefined value */
ba92458f
AE
1577 if (type != OP_RCATLINE) {
1578 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1579 SvOK_off(TARG);
ba92458f 1580 }
a0d0e21e
LW
1581 PUSHTARG;
1582 }
1583 RETURN;
1584 }
a2008d6d 1585 have_fp:
54310121 1586 if (gimme == G_SCALAR) {
a0d0e21e 1587 sv = TARG;
0f722b55
RGS
1588 if (type == OP_RCATLINE && SvGMAGICAL(sv))
1589 mg_get(sv);
48de12d9
RGS
1590 if (SvROK(sv)) {
1591 if (type == OP_RCATLINE)
5668452f 1592 SvPV_force_nomg_nolen(sv);
48de12d9
RGS
1593 else
1594 sv_unref(sv);
1595 }
f7877b28 1596 else if (isGV_with_GP(sv)) {
5668452f 1597 SvPV_force_nomg_nolen(sv);
f7877b28 1598 }
862a34c6 1599 SvUPGRADE(sv, SVt_PV);
a0d0e21e 1600 tmplen = SvLEN(sv); /* remember if already alloced */
e3918bb7 1601 if (!tmplen && !SvREADONLY(sv) && !SvIsCOW(sv)) {
f72e8700
JJ
1602 /* try short-buffering it. Please update t/op/readline.t
1603 * if you change the growth length.
1604 */
1605 Sv_Grow(sv, 80);
1606 }
2b5e58c4
AMS
1607 offset = 0;
1608 if (type == OP_RCATLINE && SvOK(sv)) {
1609 if (!SvPOK(sv)) {
5668452f 1610 SvPV_force_nomg_nolen(sv);
2b5e58c4 1611 }
a0d0e21e 1612 offset = SvCUR(sv);
2b5e58c4 1613 }
a0d0e21e 1614 }
54310121 1615 else {
561b68a9 1616 sv = sv_2mortal(newSV(80));
54310121
PP
1617 offset = 0;
1618 }
fbad3eb5 1619
3887d568
AP
1620 /* This should not be marked tainted if the fp is marked clean */
1621#define MAYBE_TAINT_LINE(io, sv) \
1622 if (!(IoFLAGS(io) & IOf_UNTAINT)) { \
1623 TAINT; \
1624 SvTAINTED_on(sv); \
1625 }
1626
684bef36 1627/* delay EOF state for a snarfed empty file */
fbad3eb5 1628#define SNARF_EOF(gimme,rs,io,sv) \
684bef36 1629 (gimme != G_SCALAR || SvCUR(sv) \
b9fee9ba 1630 || (IoFLAGS(io) & IOf_NOLINE) || !RsSNARF(rs))
fbad3eb5 1631
a0d0e21e 1632 for (;;) {
09e8efcc 1633 PUTBACK;
fbad3eb5 1634 if (!sv_gets(sv, fp, offset)
2d726892
TF
1635 && (type == OP_GLOB
1636 || SNARF_EOF(gimme, PL_rs, io, sv)
1637 || PerlIO_error(fp)))
fbad3eb5 1638 {
760ac839 1639 PerlIO_clearerr(fp);
a0d0e21e 1640 if (IoFLAGS(io) & IOf_ARGV) {
3280af22 1641 fp = nextargv(PL_last_in_gv);
a0d0e21e
LW
1642 if (fp)
1643 continue;
3280af22 1644 (void)do_close(PL_last_in_gv, FALSE);
a0d0e21e
LW
1645 }
1646 else if (type == OP_GLOB) {
a2a5de95
NC
1647 if (!do_close(PL_last_in_gv, FALSE)) {
1648 Perl_ck_warner(aTHX_ packWARN(WARN_GLOB),
1649 "glob failed (child exited with status %d%s)",
1650 (int)(STATUS_CURRENT >> 8),
1651 (STATUS_CURRENT & 0x80) ? ", core dumped" : "");
4eb79ab5 1652 }
a0d0e21e 1653 }
54310121 1654 if (gimme == G_SCALAR) {
ba92458f
AE
1655 if (type != OP_RCATLINE) {
1656 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1657 SvOK_off(TARG);
ba92458f 1658 }
09e8efcc 1659 SPAGAIN;
a0d0e21e
LW
1660 PUSHTARG;
1661 }
3887d568 1662 MAYBE_TAINT_LINE(io, sv);
a0d0e21e
LW
1663 RETURN;
1664 }
3887d568 1665 MAYBE_TAINT_LINE(io, sv);
a0d0e21e 1666 IoLINES(io)++;
b9fee9ba 1667 IoFLAGS(io) |= IOf_NOLINE;
71be2cbc 1668 SvSETMAGIC(sv);
09e8efcc 1669 SPAGAIN;
a0d0e21e 1670 XPUSHs(sv);
a0d0e21e 1671 if (type == OP_GLOB) {
349d4f2f 1672 const char *t1;
a0d0e21e 1673
3280af22 1674 if (SvCUR(sv) > 0 && SvCUR(PL_rs) > 0) {
6136c704 1675 char * const tmps = SvEND(sv) - 1;
aa07b2f6 1676 if (*tmps == *SvPVX_const(PL_rs)) {
c07a80fd 1677 *tmps = '\0';
b162af07 1678 SvCUR_set(sv, SvCUR(sv) - 1);
c07a80fd
PP
1679 }
1680 }
349d4f2f 1681 for (t1 = SvPVX_const(sv); *t1; t1++)
15861f94 1682 if (!isALPHANUMERIC(*t1) &&
349d4f2f 1683 strchr("$&*(){}[]'\";\\|?<>~`", *t1))
a0d0e21e 1684 break;
349d4f2f 1685 if (*t1 && PerlLIO_lstat(SvPVX_const(sv), &PL_statbuf) < 0) {
a0d0e21e
LW
1686 (void)POPs; /* Unmatched wildcard? Chuck it... */
1687 continue;
1688 }
2d79bf7f 1689 } else if (SvUTF8(sv)) { /* OP_READLINE, OP_RCATLINE */
d4c19fe8
AL
1690 if (ckWARN(WARN_UTF8)) {
1691 const U8 * const s = (const U8*)SvPVX_const(sv) + offset;
1692 const STRLEN len = SvCUR(sv) - offset;
1693 const U8 *f;
1694
1695 if (!is_utf8_string_loc(s, len, &f))
1696 /* Emulate :encoding(utf8) warning in the same case. */
1697 Perl_warner(aTHX_ packWARN(WARN_UTF8),
1698 "utf8 \"\\x%02X\" does not map to Unicode",
1699 f < (U8*)SvEND(sv) ? *f : 0);
1700 }
a0d0e21e 1701 }
54310121 1702 if (gimme == G_ARRAY) {
a0d0e21e 1703 if (SvLEN(sv) - SvCUR(sv) > 20) {
1da4ca5f 1704 SvPV_shrink_to_cur(sv);
a0d0e21e 1705 }
561b68a9 1706 sv = sv_2mortal(newSV(80));
a0d0e21e
LW
1707 continue;
1708 }
54310121 1709 else if (gimme == G_SCALAR && !tmplen && SvLEN(sv) - SvCUR(sv) > 80) {
a0d0e21e 1710 /* try to reclaim a bit of scalar space (only on 1st alloc) */
d5b5861b
NC
1711 const STRLEN new_len
1712 = SvCUR(sv) < 60 ? 80 : SvCUR(sv)+40; /* allow some slop */
1da4ca5f 1713 SvPV_renew(sv, new_len);
a0d0e21e
LW
1714 }
1715 RETURN;
1716 }
1717}
1718
a0d0e21e
LW
1719PP(pp_helem)
1720{
97aff369 1721 dVAR; dSP;
760ac839 1722 HE* he;
ae77835f 1723 SV **svp;
c445ea15 1724 SV * const keysv = POPs;
85fbaab2 1725 HV * const hv = MUTABLE_HV(POPs);
a3b680e6
AL
1726 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
1727 const U32 defer = PL_op->op_private & OPpLVAL_DEFER;
be6c24e0 1728 SV *sv;
92970b93 1729 const bool localizing = PL_op->op_private & OPpLVAL_INTRO;
d30e492c 1730 bool preeminent = TRUE;
a0d0e21e 1731
d4c19fe8 1732 if (SvTYPE(hv) != SVt_PVHV)
a0d0e21e 1733 RETPUSHUNDEF;
d4c19fe8 1734
92970b93 1735 if (localizing) {
d4c19fe8
AL
1736 MAGIC *mg;
1737 HV *stash;
d30e492c
VP
1738
1739 /* If we can determine whether the element exist,
1740 * Try to preserve the existenceness of a tied hash
1741 * element by using EXISTS and DELETE if possible.
1742 * Fallback to FETCH and STORE otherwise. */
2c5f48c2 1743 if (SvCANEXISTDELETE(hv))
d30e492c 1744 preeminent = hv_exists_ent(hv, keysv, 0);
d4c19fe8 1745 }
d30e492c 1746
5f9d7e2b 1747 he = hv_fetch_ent(hv, keysv, lval && !defer, 0);
d4c19fe8 1748 svp = he ? &HeVAL(he) : NULL;
a0d0e21e 1749 if (lval) {
746f6409 1750 if (!svp || !*svp || *svp == &PL_sv_undef) {
68dc0745
PP
1751 SV* lv;
1752 SV* key2;
2d8e6c8d 1753 if (!defer) {
be2597df 1754 DIE(aTHX_ PL_no_helem_sv, SVfARG(keysv));
2d8e6c8d 1755 }
68dc0745
PP
1756 lv = sv_newmortal();
1757 sv_upgrade(lv, SVt_PVLV);
1758 LvTYPE(lv) = 'y';
6136c704 1759 sv_magic(lv, key2 = newSVsv(keysv), PERL_MAGIC_defelem, NULL, 0);
fc2b2dca 1760 SvREFCNT_dec_NN(key2); /* sv_magic() increments refcount */
b37c2d43 1761 LvTARG(lv) = SvREFCNT_inc_simple(hv);
68dc0745
PP
1762 LvTARGLEN(lv) = 1;
1763 PUSHs(lv);
1764 RETURN;
1765 }
92970b93 1766 if (localizing) {
bfcb3514 1767 if (HvNAME_get(hv) && isGV(*svp))
159b6efe 1768 save_gp(MUTABLE_GV(*svp), !(PL_op->op_flags & OPf_SPECIAL));
47cfc530
VP
1769 else if (preeminent)
1770 save_helem_flags(hv, keysv, svp,
1771 (PL_op->op_flags & OPf_SPECIAL) ? 0 : SAVEf_SETMAGIC);
1772 else
1773 SAVEHDELETE(hv, keysv);
5f05dabc 1774 }
9026059d
GG
1775 else if (PL_op->op_private & OPpDEREF) {
1776 PUSHs(vivify_ref(*svp, PL_op->op_private & OPpDEREF));
1777 RETURN;
1778 }
a0d0e21e 1779 }
746f6409 1780 sv = (svp && *svp ? *svp : &PL_sv_undef);
fd69380d
DM
1781 /* Originally this did a conditional C<sv = sv_mortalcopy(sv)>; this
1782 * was to make C<local $tied{foo} = $tied{foo}> possible.
1783 * However, it seems no longer to be needed for that purpose, and
1784 * introduced a new bug: stuff like C<while ($hash{taintedval} =~ /.../g>
1785 * would loop endlessly since the pos magic is getting set on the
1786 * mortal copy and lost. However, the copy has the effect of
1787 * triggering the get magic, and losing it altogether made things like
1788 * c<$tied{foo};> in void context no longer do get magic, which some
1789 * code relied on. Also, delayed triggering of magic on @+ and friends
1790 * meant the original regex may be out of scope by now. So as a
1791 * compromise, do the get magic here. (The MGf_GSKIP flag will stop it
1792 * being called too many times). */
39cf747a 1793 if (!lval && SvRMAGICAL(hv) && SvGMAGICAL(sv))
fd69380d 1794 mg_get(sv);
be6c24e0 1795 PUSHs(sv);
a0d0e21e
LW
1796 RETURN;
1797}
1798
a0d0e21e
LW
1799PP(pp_iter)
1800{
97aff369 1801 dVAR; dSP;
eb578fdb 1802 PERL_CONTEXT *cx;
7d6c2cef 1803 SV *oldsv;
1d7c1841 1804 SV **itersvp;
a0d0e21e 1805
924508f0 1806 EXTEND(SP, 1);
a0d0e21e 1807 cx = &cxstack[cxstack_ix];
1d7c1841 1808 itersvp = CxITERVAR(cx);
a48ce6be
DM
1809
1810 switch (CxTYPE(cx)) {
17c91640 1811
b552b52c
DM
1812 case CXt_LOOP_LAZYSV: /* string increment */
1813 {
1814 SV* cur = cx->blk_loop.state_u.lazysv.cur;
1815 SV *end = cx->blk_loop.state_u.lazysv.end;
1816 /* If the maximum is !SvOK(), pp_enteriter substitutes PL_sv_no.
1817 It has SvPVX of "" and SvCUR of 0, which is what we want. */
1818 STRLEN maxlen = 0;
1819 const char *max = SvPV_const(end, maxlen);
1820 if (SvNIOK(cur) || SvCUR(cur) > maxlen)
1821 RETPUSHNO;
1822
1823 oldsv = *itersvp;
1824 if (SvREFCNT(oldsv) == 1 && !SvMAGICAL(oldsv)) {
1825 /* safe to reuse old SV */
1826 sv_setsv(oldsv, cur);
a48ce6be 1827 }
b552b52c
DM
1828 else
1829 {
1830 /* we need a fresh SV every time so that loop body sees a
1831 * completely new SV for closures/references to work as
1832 * they used to */
1833 *itersvp = newSVsv(cur);
fc2b2dca 1834 SvREFCNT_dec_NN(oldsv);
b552b52c
DM
1835 }
1836 if (strEQ(SvPVX_const(cur), max))
1837 sv_setiv(cur, 0); /* terminate next time */
1838 else
1839 sv_inc(cur);
1840 break;
1841 }
a48ce6be 1842
fcef60b4
DM
1843 case CXt_LOOP_LAZYIV: /* integer increment */
1844 {
1845 IV cur = cx->blk_loop.state_u.lazyiv.cur;
1846 if (cur > cx->blk_loop.state_u.lazyiv.end)
89ea2908 1847 RETPUSHNO;
7f61b687 1848
fcef60b4 1849 oldsv = *itersvp;
3db8f154 1850 /* don't risk potential race */
fcef60b4 1851 if (SvREFCNT(oldsv) == 1 && !SvMAGICAL(oldsv)) {
eaa5c2d6 1852 /* safe to reuse old SV */
fcef60b4 1853 sv_setiv(oldsv, cur);
eaa5c2d6 1854 }
1c846c1f 1855 else
eaa5c2d6
GA
1856 {
1857 /* we need a fresh SV every time so that loop body sees a
1858 * completely new SV for closures/references to work as they
1859 * used to */
fcef60b4 1860 *itersvp = newSViv(cur);
fc2b2dca 1861 SvREFCNT_dec_NN(oldsv);
eaa5c2d6 1862 }
a2309040 1863
fcef60b4 1864 if (cur == IV_MAX) {
cdc1aa42
NC
1865 /* Handle end of range at IV_MAX */
1866 cx->blk_loop.state_u.lazyiv.end = IV_MIN;
1867 } else
1868 ++cx->blk_loop.state_u.lazyiv.cur;
a48ce6be 1869 break;
fcef60b4 1870 }
a48ce6be 1871
b552b52c 1872 case CXt_LOOP_FOR: /* iterate array */
7d6c2cef 1873 {
89ea2908 1874
7d6c2cef
DM
1875 AV *av = cx->blk_loop.state_u.ary.ary;
1876 SV *sv;
1877 bool av_is_stack = FALSE;
a8a20bb6 1878 IV ix;
7d6c2cef 1879
de080daa
DM
1880 if (!av) {
1881 av_is_stack = TRUE;
1882 av = PL_curstack;
1883 }
1884 if (PL_op->op_private & OPpITER_REVERSED) {
a8a20bb6
DM
1885 ix = --cx->blk_loop.state_u.ary.ix;
1886 if (ix <= (av_is_stack ? cx->blk_loop.resetsp : -1))
de080daa 1887 RETPUSHNO;
de080daa
DM
1888 }
1889 else {
a8a20bb6
DM
1890 ix = ++cx->blk_loop.state_u.ary.ix;
1891 if (ix > (av_is_stack ? cx->blk_oldsp : AvFILL(av)))
de080daa 1892 RETPUSHNO;
a8a20bb6 1893 }
de080daa 1894
a8a20bb6
DM
1895 if (SvMAGICAL(av) || AvREIFY(av)) {
1896 SV * const * const svp = av_fetch(av, ix, FALSE);
1897 sv = svp ? *svp : NULL;
1898 }
1899 else {
1900 sv = AvARRAY(av)[ix];
de080daa 1901 }
ef3e5ea9 1902
de080daa 1903 if (sv) {
f38aa882
DM
1904 if (SvIS_FREED(sv)) {
1905 *itersvp = NULL;
1906 Perl_croak(aTHX_ "Use of freed value in iteration");
1907 }
8e079c2a
FC
1908 if (SvPADTMP(sv) && !IS_PADGV(sv))
1909 sv = newSVsv(sv);
1910 else {
1911 SvTEMP_off(sv);
1912 SvREFCNT_inc_simple_void_NN(sv);
1913 }
de080daa
DM
1914 }
1915 else
1916 sv = &PL_sv_undef;
f38aa882 1917
de080daa
DM
1918 if (!av_is_stack && sv == &PL_sv_undef) {
1919 SV *lv = newSV_type(SVt_PVLV);
1920 LvTYPE(lv) = 'y';
1921 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
1922 LvTARG(lv) = SvREFCNT_inc_simple(av);
f38aa882 1923 LvTARGOFF(lv) = ix;
de080daa
DM
1924 LvTARGLEN(lv) = (STRLEN)UV_MAX;
1925 sv = lv;
1926 }
a0d0e21e 1927
de080daa
DM
1928 oldsv = *itersvp;
1929 *itersvp = sv;
1930 SvREFCNT_dec(oldsv);
de080daa 1931 break;
7d6c2cef 1932 }
a48ce6be
DM
1933
1934 default:
1935 DIE(aTHX_ "panic: pp_iter, type=%u", CxTYPE(cx));
1936 }
b552b52c 1937 RETPUSHYES;
a0d0e21e
LW
1938}
1939
ef07e810
DM
1940/*
1941A description of how taint works in pattern matching and substitution.
1942
284167a5
SM
1943This is all conditional on NO_TAINT_SUPPORT not being defined. Under
1944NO_TAINT_SUPPORT, taint-related operations should become no-ops.
1945
4e19c54b 1946While the pattern is being assembled/concatenated and then compiled,
284167a5
SM
1947PL_tainted will get set (via TAINT_set) if any component of the pattern
1948is tainted, e.g. /.*$tainted/. At the end of pattern compilation,
1949the RXf_TAINTED flag is set on the pattern if PL_tainted is set (via
1950TAINT_get).
ef07e810 1951
0ab462a6
DM
1952When the pattern is copied, e.g. $r = qr/..../, the SV holding the ref to
1953the pattern is marked as tainted. This means that subsequent usage, such
284167a5
SM
1954as /x$r/, will set PL_tainted using TAINT_set, and thus RXf_TAINTED,
1955on the new pattern too.
ef07e810 1956
272d35c9 1957At the start of execution of a pattern, the RXf_TAINTED_SEEN flag on the
ca143fe8 1958regex is cleared; during execution, locale-variant ops such as POSIXL may
272d35c9 1959set RXf_TAINTED_SEEN.
ef07e810 1960
272d35c9 1961RXf_TAINTED_SEEN is used post-execution by the get magic code
ef07e810
DM
1962of $1 et al to indicate whether the returned value should be tainted.
1963It is the responsibility of the caller of the pattern (i.e. pp_match,
1964pp_subst etc) to set this flag for any other circumstances where $1 needs
1965to be tainted.
1966
1967The taint behaviour of pp_subst (and pp_substcont) is quite complex.
1968
1969There are three possible sources of taint
1970 * the source string
1971 * the pattern (both compile- and run-time, RXf_TAINTED / RXf_TAINTED_SEEN)
1972 * the replacement string (or expression under /e)
1973
1974There are four destinations of taint and they are affected by the sources
1975according to the rules below:
1976
1977 * the return value (not including /r):
1978 tainted by the source string and pattern, but only for the
1979 number-of-iterations case; boolean returns aren't tainted;
1980 * the modified string (or modified copy under /r):
1981 tainted by the source string, pattern, and replacement strings;
1982 * $1 et al:
1983 tainted by the pattern, and under 'use re "taint"', by the source
1984 string too;
1985 * PL_taint - i.e. whether subsequent code (e.g. in a /e block) is tainted:
1986 should always be unset before executing subsequent code.
1987
1988The overall action of pp_subst is:
1989
1990 * at the start, set bits in rxtainted indicating the taint status of
1991 the various sources.
1992
1993 * After each pattern execution, update the SUBST_TAINT_PAT bit in
1994 rxtainted if RXf_TAINTED_SEEN has been set, to indicate that the
1995 pattern has subsequently become tainted via locale ops.
1996
1997 * If control is being passed to pp_substcont to execute a /e block,
1998 save rxtainted in the CXt_SUBST block, for future use by
1999 pp_substcont.
2000
2001 * Whenever control is being returned to perl code (either by falling
2002 off the "end" of pp_subst/pp_substcont, or by entering a /e block),
2003 use the flag bits in rxtainted to make all the appropriate types of
0ab462a6
DM
2004 destination taint visible; e.g. set RXf_TAINTED_SEEN so that $1
2005 et al will appear tainted.
ef07e810
DM
2006
2007pp_match is just a simpler version of the above.
2008
2009*/
2010
a0d0e21e
LW
2011PP(pp_subst)
2012{
97aff369 2013 dVAR; dSP; dTARG;
eb578fdb 2014 PMOP *pm = cPMOP;
a0d0e21e 2015 PMOP *rpm = pm;
eb578fdb 2016 char *s;
a0d0e21e 2017 char *strend;
5c144d81 2018 const char *c;
a0d0e21e
LW
2019 STRLEN clen;
2020 I32 iters = 0;
2021 I32 maxiters;
a0d0e21e 2022 bool once;
ef07e810
DM
2023 U8 rxtainted = 0; /* holds various SUBST_TAINT_* flag bits.
2024 See "how taint works" above */
a0d0e21e 2025 char *orig;
1ed74d04 2026 U8 r_flags;
eb578fdb 2027 REGEXP *rx = PM_GETRE(pm);
a0d0e21e
LW
2028 STRLEN len;
2029 int force_on_match = 0;
0bcc34c2 2030 const I32 oldsave = PL_savestack_ix;
792b2c16 2031 STRLEN slen;
26a74523 2032 bool doutf8 = FALSE; /* whether replacement is in utf8 */
db2c6cb3 2033#ifdef PERL_ANY_COW
ed252734
NC
2034 bool is_cow;
2035#endif
a0714e2c 2036 SV *nsv = NULL;
b770e143 2037 /* known replacement string? */
eb578fdb 2038 SV *dstr = (pm->op_pmflags & PMf_CONST) ? POPs : NULL;
a0d0e21e 2039
f410a211
NC
2040 PERL_ASYNC_CHECK();
2041
533c011a 2042 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 2043 TARG = POPs;
59f00321
RGS
2044 else if (PL_op->op_private & OPpTARGET_MY)
2045 GETTARGET;
a0d0e21e 2046 else {
54b9620d 2047 TARG = DEFSV;
a0d0e21e 2048 EXTEND(SP,1);
1c846c1f 2049 }
d9f424b2 2050
64534138 2051 SvGETMAGIC(TARG); /* must come before cow check */
db2c6cb3 2052#ifdef PERL_ANY_COW
ed252734
NC
2053 /* Awooga. Awooga. "bool" types that are actually char are dangerous,
2054 because they make integers such as 256 "false". */
2055 is_cow = SvIsCOW(TARG) ? TRUE : FALSE;
2056#else
765f542d
NC
2057 if (SvIsCOW(TARG))
2058 sv_force_normal_flags(TARG,0);
ed252734 2059#endif
8ca8a454 2060 if (!(rpm->op_pmflags & PMf_NONDESTRUCT)
8ca8a454
NC
2061 && (SvREADONLY(TARG)
2062 || ( ((SvTYPE(TARG) == SVt_PVGV && isGV_with_GP(TARG))
2063 || SvTYPE(TARG) > SVt_PVLV)
2064 && !(SvTYPE(TARG) == SVt_PVGV && SvFAKE(TARG)))))
cb077ed2 2065 Perl_croak_no_modify();
8ec5e241
NIS
2066 PUTBACK;
2067
6ac6605d
DM
2068 orig = SvPV_nomg(TARG, len);
2069 /* note we don't (yet) force the var into being a string; if we fail
2070 * to match, we leave as-is; on successful match howeverm, we *will*
2071 * coerce into a string, then repeat the match */
4499db73 2072 if (!SvPOKp(TARG) || SvTYPE(TARG) == SVt_PVGV || SvVOK(TARG))
a0d0e21e 2073 force_on_match = 1;
20be6587
DM
2074
2075 /* only replace once? */
2076 once = !(rpm->op_pmflags & PMf_GLOBAL);
2077
ef07e810 2078 /* See "how taint works" above */
284167a5 2079 if (TAINTING_get) {
20be6587
DM
2080 rxtainted = (
2081 (SvTAINTED(TARG) ? SUBST_TAINT_STR : 0)
284167a5 2082 | (RX_ISTAINTED(rx) ? SUBST_TAINT_PAT : 0)
20be6587
DM
2083 | ((pm->op_pmflags & PMf_RETAINT) ? SUBST_TAINT_RETAINT : 0)
2084 | ((once && !(rpm->op_pmflags & PMf_NONDESTRUCT))
2085 ? SUBST_TAINT_BOOLRET : 0));
2086 TAINT_NOT;
2087 }
a12c0f56 2088
a0d0e21e 2089 force_it:
6ac6605d
DM
2090 if (!pm || !orig)
2091 DIE(aTHX_ "panic: pp_subst, pm=%p, orig=%p", pm, orig);
a0d0e21e 2092
6ac6605d
DM
2093 strend = orig + len;
2094 slen = DO_UTF8(TARG) ? utf8_length((U8*)orig, (U8*)strend) : len;
792b2c16
JH
2095 maxiters = 2 * slen + 10; /* We can match twice at each
2096 position, once with zero-length,
2097 second time with non-zero. */
a0d0e21e 2098
6a97c51d 2099 if (!RX_PRELEN(rx) && PL_curpm
8d919b0a 2100 && !ReANY(rx)->mother_re) {
3280af22 2101 pm = PL_curpm;
aaa362c4 2102 rx = PM_GETRE(pm);
a0d0e21e 2103 }
6502e081 2104
6e240d0b 2105#ifdef PERL_SAWAMPERSAND
6502e081
DM
2106 r_flags = ( RX_NPARENS(rx)
2107 || PL_sawampersand
6502e081 2108 || (RX_EXTFLAGS(rx) & (RXf_EVAL_SEEN|RXf_PMf_KEEPCOPY))
5b0e71e9 2109 || (rpm->op_pmflags & PMf_KEEPCOPY)
6502e081
DM
2110 )
2111 ? REXEC_COPY_STR
2112 : 0;
6e240d0b
FC
2113#else
2114 r_flags = REXEC_COPY_STR;
2115#endif
7fba1cd6 2116
0395280b 2117 if (!CALLREGEXEC(rx, orig, strend, orig, 0, TARG, NULL, r_flags))
8b64c330 2118 {
5e79dfb9
DM
2119 SPAGAIN;
2120 PUSHs(rpm->op_pmflags & PMf_NONDESTRUCT ? TARG : &PL_sv_no);
2121 LEAVE_SCOPE(oldsave);
2122 RETURN;
2123 }
1754320d
FC
2124 PL_curpm = pm;
2125
71be2cbc 2126 /* known replacement string? */
f272994b 2127 if (dstr) {
8514a05a
JH
2128 /* replacement needing upgrading? */
2129 if (DO_UTF8(TARG) && !doutf8) {
db79b45b 2130 nsv = sv_newmortal();
4a176938 2131 SvSetSV(nsv, dstr);
8514a05a
JH
2132 if (PL_encoding)
2133 sv_recode_to_utf8(nsv, PL_encoding);
2134 else
2135 sv_utf8_upgrade(nsv);
5c144d81 2136 c = SvPV_const(nsv, clen);
4a176938
JH
2137 doutf8 = TRUE;
2138 }
2139 else {
5c144d81 2140 c = SvPV_const(dstr, clen);
4a176938 2141 doutf8 = DO_UTF8(dstr);
8514a05a 2142 }
bb933b9b
FC
2143
2144 if (SvTAINTED(dstr))
2145 rxtainted |= SUBST_TAINT_REPL;
f272994b
A
2146 }
2147 else {
6136c704 2148 c = NULL;
f272994b
A
2149 doutf8 = FALSE;
2150 }
2151
71be2cbc 2152 /* can do inplace substitution? */
ed252734 2153 if (c
db2c6cb3 2154#ifdef PERL_ANY_COW
ed252734
NC
2155 && !is_cow
2156#endif
fbfb1899
DM
2157 && (I32)clen <= RX_MINLENRET(rx)
2158 && (once || !(r_flags & REXEC_COPY_STR))
dbc200c5 2159 && !(RX_EXTFLAGS(rx) & RXf_NO_INPLACE_SUBST)
8ca8a454
NC
2160 && (!doutf8 || SvUTF8(TARG))
2161 && !(rpm->op_pmflags & PMf_NONDESTRUCT))
8b030b38 2162 {
ec911639 2163
db2c6cb3 2164#ifdef PERL_ANY_COW
ed252734 2165 if (SvIsCOW(TARG)) {
f7a8268c 2166 if (!force_on_match)
ed252734 2167 goto have_a_cow;
f7a8268c 2168 assert(SvVOK(TARG));
ed252734
NC
2169 }
2170#endif
71be2cbc 2171 if (force_on_match) {
6ac6605d
DM
2172 /* redo the first match, this time with the orig var
2173 * forced into being a string */
71be2cbc 2174 force_on_match = 0;
6ac6605d 2175 orig = SvPV_force_nomg(TARG, len);
71be2cbc
PP
2176 goto force_it;
2177 }
39b40493 2178
71be2cbc 2179 if (once) {
c67ab8f2 2180 char *d, *m;
20be6587
DM
2181 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2182 rxtainted |= SUBST_TAINT_PAT;
07bc277f
NC
2183 m = orig + RX_OFFS(rx)[0].start;
2184 d = orig + RX_OFFS(rx)[0].end;
71be2cbc
PP
2185 s = orig;
2186 if (m - s > strend - d) { /* faster to shorten from end */
2ec7214c 2187 I32 i;
71be2cbc
PP
2188 if (clen) {
2189 Copy(c, m, clen, char);
2190 m += clen;
a0d0e21e 2191 }
71be2cbc
PP
2192 i = strend - d;
2193 if (i > 0) {
2194 Move(d, m, i, char);
2195 m += i;
a0d0e21e 2196 }
71be2cbc
PP
2197 *m = '\0';
2198 SvCUR_set(TARG, m - s);
2199 }
2ec7214c
DM
2200 else { /* faster from front */
2201 I32 i = m - s;
71be2cbc 2202 d -= clen;
2ec7214c
DM
2203 if (i > 0)
2204 Move(s, d - i, i, char);
71be2cbc 2205 sv_chop(TARG, d-i);
71be2cbc 2206 if (clen)
c947cd8d 2207 Copy(c, d, clen, char);
71be2cbc 2208 }
8ec5e241 2209 SPAGAIN;
8ca8a454 2210 PUSHs(&PL_sv_yes);
71be2cbc
PP
2211 }
2212 else {
c67ab8f2 2213 char *d, *m;
0395280b 2214 d = s = RX_OFFS(rx)[0].start + orig;
71be2cbc 2215 do {
2b25edcf 2216 I32 i;
71be2cbc 2217 if (iters++ > maxiters)
cea2e8a9 2218 DIE(aTHX_ "Substitution loop");
20be6587
DM
2219 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2220 rxtainted |= SUBST_TAINT_PAT;
07bc277f 2221 m = RX_OFFS(rx)[0].start + orig;
155aba94 2222 if ((i = m - s)) {
71be2cbc
PP
2223 if (s != d)
2224 Move(s, d, i, char);
2225 d += i;
a0d0e21e 2226 }
71be2cbc
PP
2227 if (clen) {
2228 Copy(c, d, clen, char);
2229 d += clen;
2230 }
07bc277f 2231 s = RX_OFFS(rx)[0].end + orig;
f9f4320a 2232 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
f722798b
IZ
2233 TARG, NULL,
2234 /* don't match same null twice */
d5e7783a 2235 REXEC_NOT_FIRST|REXEC_IGNOREPOS|REXEC_FAIL_ON_UNDERFLOW));
71be2cbc 2236 if (s != d) {
2b25edcf 2237 I32 i = strend - s;
aa07b2f6 2238 SvCUR_set(TARG, d - SvPVX_const(TARG) + i);
71be2cbc 2239 Move(s, d, i+1, char); /* include the NUL */
a0d0e21e 2240 }
8ec5e241 2241 SPAGAIN;
8ca8a454 2242 mPUSHi((I32)iters);
a0d0e21e
LW
2243 }
2244 }
ff6e92e8 2245 else {
1754320d 2246 bool first;
c67ab8f2 2247 char *m;
1754320d 2248 SV *repl;
a0d0e21e 2249 if (force_on_match) {
6ac6605d
DM
2250 /* redo the first match, this time with the orig var
2251 * forced into being a string */
a0d0e21e 2252 force_on_match = 0;
0c1438a1
NC
2253 if (rpm->op_pmflags & PMf_NONDESTRUCT) {
2254 /* I feel that it should be possible to avoid this mortal copy
2255 given that the code below copies into a new destination.
2256 However, I suspect it isn't worth the complexity of
2257 unravelling the C<goto force_it> for the small number of
2258 cases where it would be viable to drop into the copy code. */
2259 TARG = sv_2mortal(newSVsv(TARG));
2260 }
6ac6605d 2261 orig = SvPV_force_nomg(TARG, len);
a0d0e21e
LW
2262 goto force_it;
2263 }
db2c6cb3 2264#ifdef PERL_ANY_COW
ed252734
NC
2265 have_a_cow:
2266#endif
20be6587
DM
2267 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2268 rxtainted |= SUBST_TAINT_PAT;
1754320d 2269 repl = dstr;
0395280b
DM
2270 s = RX_OFFS(rx)[0].start + orig;
2271 dstr = newSVpvn_flags(orig, s-orig,
2272 SVs_TEMP | (DO_UTF8(TARG) ? SVf_UTF8 : 0));
a0d0e21e 2273 if (!c) {
eb578fdb 2274 PERL_CONTEXT *cx;
8ec5e241 2275 SPAGAIN;
0395280b 2276 m = orig;
20be6587
DM
2277 /* note that a whole bunch of local vars are saved here for
2278 * use by pp_substcont: here's a list of them in case you're
2279 * searching for places in this sub that uses a particular var:
2280 * iters maxiters r_flags oldsave rxtainted orig dstr targ
2281 * s m strend rx once */
a0d0e21e 2282 PUSHSUBST(cx);
20e98b0f 2283 RETURNOP(cPMOP->op_pmreplrootu.op_pmreplroot);
a0d0e21e 2284 }
1754320d 2285 first = TRUE;
a0d0e21e
LW
2286 do {
2287 if (iters++ > maxiters)
cea2e8a9 2288 DIE(aTHX_ "Substitution loop");
20be6587
DM
2289 if (RX_MATCH_TAINTED(rx))
2290 rxtainted |= SUBST_TAINT_PAT;
07bc277f 2291 if (RX_MATCH_COPIED(rx) && RX_SUBBEG(rx) != orig) {
c67ab8f2
DM
2292 char *old_s = s;
2293 char *old_orig = orig;
6502e081 2294 assert(RX_SUBOFFSET(rx) == 0);
c67ab8f2 2295
07bc277f 2296 orig = RX_SUBBEG(rx);
c67ab8f2
DM
2297 s = orig + (old_s - old_orig);
2298 strend = s + (strend - old_s);
a0d0e21e 2299 }
07bc277f 2300 m = RX_OFFS(rx)[0].start + orig;
64534138 2301 sv_catpvn_nomg_maybeutf8(dstr, s, m - s, DO_UTF8(TARG));
07bc277f 2302 s = RX_OFFS(rx)[0].end + orig;
1754320d
FC
2303 if (first) {
2304 /* replacement already stringified */
2305 if (clen)
64534138 2306 sv_catpvn_nomg_maybeutf8(dstr, c, clen, doutf8);
1754320d
FC
2307 first = FALSE;
2308 }
2309 else {
1754320d
FC
2310 if (PL_encoding) {
2311 if (!nsv) nsv = sv_newmortal();
2312 sv_copypv(nsv, repl);
2313 if (!DO_UTF8(nsv)) sv_recode_to_utf8(nsv, PL_encoding);
2314 sv_catsv(dstr, nsv);
2315 }
2316 else sv_catsv(dstr, repl);
bb933b9b
FC
2317 if (SvTAINTED(repl))
2318 rxtainted |= SUBST_TAINT_REPL;
1754320d 2319 }
a0d0e21e
LW
2320 if (once)
2321 break;
f9f4320a 2322 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
d5e7783a
DM
2323 TARG, NULL,
2324 REXEC_NOT_FIRST|REXEC_IGNOREPOS|REXEC_FAIL_ON_UNDERFLOW));
64534138 2325 sv_catpvn_nomg_maybeutf8(dstr, s, strend - s, DO_UTF8(TARG));
748a9306 2326
8ca8a454
NC
2327 if (rpm->op_pmflags & PMf_NONDESTRUCT) {
2328 /* From here on down we're using the copy, and leaving the original
2329 untouched. */
2330 TARG = dstr;
2331 SPAGAIN;
2332 PUSHs(dstr);
2333 } else {
db2c6cb3 2334#ifdef PERL_ANY_COW
8ca8a454
NC
2335 /* The match may make the string COW. If so, brilliant, because
2336 that's just saved us one malloc, copy and free - the regexp has
2337 donated the old buffer, and we malloc an entirely new one, rather
2338 than the regexp malloc()ing a buffer and copying our original,
2339 only for us to throw it away here during the substitution. */
2340 if (SvIsCOW(TARG)) {
2341 sv_force_normal_flags(TARG, SV_COW_DROP_PV);
2342 } else
ed252734 2343#endif
8ca8a454
NC
2344 {
2345 SvPV_free(TARG);
2346 }
2347 SvPV_set(TARG, SvPVX(dstr));
2348 SvCUR_set(TARG, SvCUR(dstr));
2349 SvLEN_set(TARG, SvLEN(dstr));
64534138 2350 SvFLAGS(TARG) |= SvUTF8(dstr);
8ca8a454 2351 SvPV_set(dstr, NULL);
748a9306 2352
8ca8a454 2353 SPAGAIN;
4f4d7508 2354 mPUSHi((I32)iters);
8ca8a454
NC
2355 }
2356 }
2357
2358 if (!(rpm->op_pmflags & PMf_NONDESTRUCT)) {
2359 (void)SvPOK_only_UTF8(TARG);
a0d0e21e 2360 }
20be6587 2361
ef07e810 2362 /* See "how taint works" above */
284167a5 2363 if (TAINTING_get) {
20be6587
DM
2364 if ((rxtainted & SUBST_TAINT_PAT) ||
2365 ((rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_RETAINT)) ==
2366 (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
2367 )
2368 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
2369
2370 if (!(rxtainted & SUBST_TAINT_BOOLRET)
2371 && (rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT))
2372 )
2373 SvTAINTED_on(TOPs); /* taint return value */
2374 else
2375 SvTAINTED_off(TOPs); /* may have got tainted earlier */
2376
2377 /* needed for mg_set below */
284167a5
SM
2378 TAINT_set(
2379 cBOOL(rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL))
2380 );
20be6587
DM
2381 SvTAINT(TARG);
2382 }
2383 SvSETMAGIC(TARG); /* PL_tainted must be correctly set for this mg_set */
2384 TAINT_NOT;
f1a76097
DM
2385 LEAVE_SCOPE(oldsave);
2386 RETURN;
a0d0e21e
LW
2387}
2388
2389PP(pp_grepwhile)
2390{
27da23d5 2391 dVAR; dSP;
a0d0e21e
LW
2392
2393 if (SvTRUEx(POPs))
3280af22
NIS
2394 PL_stack_base[PL_markstack_ptr[-1]++] = PL_stack_base[*PL_markstack_ptr];
2395 ++*PL_markstack_ptr;
b2a2a901 2396 FREETMPS;
d343c3ef 2397 LEAVE_with_name("grep_item"); /* exit inner scope */
a0d0e21e
LW
2398
2399 /* All done yet? */
3280af22 2400 if (PL_stack_base + *PL_markstack_ptr > SP) {
a0d0e21e 2401 I32 items;
c4420975 2402 const I32 gimme = GIMME_V;
a0d0e21e 2403
d343c3ef 2404 LEAVE_with_name("grep"); /* exit outer scope */
a0d0e21e 2405 (void)POPMARK; /* pop src */
3280af22 2406 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 2407 (void)POPMARK; /* pop dst */
3280af22 2408 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 2409 if (gimme == G_SCALAR) {
7cc47870 2410 if (PL_op->op_private & OPpGREP_LEX) {
c4420975 2411 SV* const sv = sv_newmortal();
7cc47870
RGS
2412 sv_setiv(sv, items);
2413 PUSHs(sv);
2414 }
2415 else {
2416 dTARGET;
2417 XPUSHi(items);
2418 }
a0d0e21e 2419 }
54310121
PP
2420 else if (gimme == G_ARRAY)
2421 SP += items;
a0d0e21e
LW
2422 RETURN;
2423 }
2424 else {
2425 SV *src;
2426
d343c3ef 2427 ENTER_with_name("grep_item"); /* enter inner scope */
1d7c1841 2428 SAVEVPTR(PL_curpm);
a0d0e21e 2429
3280af22 2430 src = PL_stack_base[*PL_markstack_ptr];
a0ed822e
FC
2431 if (SvPADTMP(src) && !IS_PADGV(src)) {
2432 src = PL_stack_base[*PL_markstack_ptr] = sv_mortalcopy(src);
2433 PL_tmps_floor++;
2434 }
a0d0e21e 2435 SvTEMP_off(src);
59f00321
RGS
2436 if (PL_op->op_private & OPpGREP_LEX)
2437 PAD_SVl(PL_op->op_targ) = src;
2438 else
414bf5ae 2439 DEFSV_set(src);
a0d0e21e
LW
2440
2441 RETURNOP(cLOGOP->op_other);
2442 }
2443}
2444
2445PP(pp_leavesub)
2446{
27da23d5 2447 dVAR; dSP;
a0d0e21e
LW
2448 SV **mark;
2449 SV **newsp;
2450 PMOP *newpm;
2451 I32 gimme;
eb578fdb 2452 PERL_CONTEXT *cx;
b0d9ce38 2453 SV *sv;
a0d0e21e 2454
9850bf21
RH
2455 if (CxMULTICALL(&cxstack[cxstack_ix]))
2456 return 0;
2457
a0d0e21e 2458 POPBLOCK(cx,newpm);
5dd42e15 2459 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2460
a1f49e72 2461 TAINT_NOT;
a0d0e21e
LW
2462 if (gimme == G_SCALAR) {
2463 MARK = newsp + 1;
a29cdaf0 2464 if (MARK <= SP) {
a8bba7fa 2465 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
6f48390a
FC
2466 if (SvTEMP(TOPs) && SvREFCNT(TOPs) == 1
2467 && !SvMAGICAL(TOPs)) {
a29cdaf0
IZ
2468 *MARK = SvREFCNT_inc(TOPs);
2469 FREETMPS;
2470 sv_2mortal(*MARK);
cd06dffe
GS
2471 }
2472 else {
959e3673 2473 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
a29cdaf0 2474 FREETMPS;
959e3673 2475 *MARK = sv_mortalcopy(sv);
fc2b2dca 2476 SvREFCNT_dec_NN(sv);
a29cdaf0 2477 }
cd06dffe 2478 }
6f48390a
FC
2479 else if (SvTEMP(TOPs) && SvREFCNT(TOPs) == 1
2480 && !SvMAGICAL(TOPs)) {
767eda44 2481 *MARK = TOPs;
767eda44 2482 }
cd06dffe 2483 else
767eda44 2484 *MARK = sv_mortalcopy(TOPs);
cd06dffe
GS
2485 }
2486 else {
f86702cc 2487 MEXTEND(MARK, 0);
3280af22 2488 *MARK = &PL_sv_undef;
a0d0e21e
LW
2489 }
2490 SP = MARK;
2491 }
54310121 2492 else if (gimme == G_ARRAY) {
f86702cc 2493 for (MARK = newsp + 1; MARK <= SP; MARK++) {
6f48390a
FC
2494 if (!SvTEMP(*MARK) || SvREFCNT(*MARK) != 1
2495 || SvMAGICAL(*MARK)) {
f86702cc 2496 *MARK = sv_mortalcopy(*MARK);
a1f49e72
CS
2497 TAINT_NOT; /* Each item is independent */
2498 }
f86702cc 2499 }
a0d0e21e 2500 }
f86702cc 2501 PUTBACK;
1c846c1f 2502
a57c6685 2503 LEAVE;
5dd42e15 2504 cxstack_ix--;
b0d9ce38 2505 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
3280af22 2506 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e 2507
b0d9ce38 2508 LEAVESUB(sv);
f39bc417 2509 return cx->blk_sub.retop;
a0d0e21e
LW
2510}
2511
2512PP(pp_entersub)
2513{
27da23d5 2514 dVAR; dSP; dPOPss;
a0d0e21e 2515 GV *gv;
eb578fdb
KW
2516 CV *cv;
2517 PERL_CONTEXT *cx;
5d94fbed 2518 I32 gimme;
a9c4fd4e 2519 const bool hasargs = (PL_op->op_flags & OPf_STACKED) != 0;
a0d0e21e
LW
2520
2521 if (!sv)
cea2e8a9 2522 DIE(aTHX_ "Not a CODE reference");
a0d0e21e 2523 switch (SvTYPE(sv)) {
f1025168
NC
2524 /* This is overwhelming the most common case: */
2525 case SVt_PVGV:
13be902c 2526 we_have_a_glob:
159b6efe 2527 if (!(cv = GvCVu((const GV *)sv))) {
f730a42d 2528 HV *stash;
f2c0649b 2529 cv = sv_2cv(sv, &stash, &gv, 0);
f730a42d 2530 }
f1025168 2531 if (!cv) {
a57c6685 2532 ENTER;
f1025168
NC
2533 SAVETMPS;
2534 goto try_autoload;
2535 }
2536 break;
13be902c
FC
2537 case SVt_PVLV:
2538 if(isGV_with_GP(sv)) goto we_have_a_glob;
2539 /*FALLTHROUGH*/
a0d0e21e 2540 default:
7c75014e
DM
2541 if (sv == &PL_sv_yes) { /* unfound import, ignore */
2542 if (hasargs)
2543 SP = PL_stack_base + POPMARK;
4d198de3
DM
2544 else
2545 (void)POPMARK;
7c75014e
DM
2546 RETURN;
2547 }
2548 SvGETMAGIC(sv);
2549 if (SvROK(sv)) {
93d7320b
DM
2550 if (SvAMAGIC(sv)) {
2551 sv = amagic_deref_call(sv, to_cv_amg);
2552 /* Don't SPAGAIN here. */
2553 }
7c75014e
DM
2554 }
2555 else {
a9c4fd4e 2556 const char *sym;
780a5241 2557 STRLEN len;
79a3e5ea 2558 if (!SvOK(sv))
cea2e8a9 2559 DIE(aTHX_ PL_no_usym, "a subroutine");
79a3e5ea 2560 sym = SvPV_nomg_const(sv, len);
533c011a 2561 if (PL_op->op_private & HINT_STRICT_REFS)
b375e37b 2562 DIE(aTHX_ "Can't use string (\"%" SVf32 "\"%s) as a subroutine ref while \"strict refs\" in use", sv, len>32 ? "..." : "");
780a5241 2563 cv = get_cvn_flags(sym, len, GV_ADD|SvUTF8(sv));
a0d0e21e
LW
2564 break;
2565 }
ea726b52 2566 cv = MUTABLE_CV(SvRV(sv));
a0d0e21e
LW
2567 if (SvTYPE(cv) == SVt_PVCV)
2568 break;
2569 /* FALL THROUGH */
2570 case SVt_PVHV:
2571 case SVt_PVAV:
cea2e8a9 2572 DIE(aTHX_ "Not a CODE reference");
f1025168 2573 /* This is the second most common case: */
a0d0e21e 2574 case SVt_PVCV:
ea726b52 2575 cv = MUTABLE_CV(sv);
a0d0e21e 2576 break;
a0d0e21e
LW
2577 }
2578
a57c6685 2579 ENTER;
a0d0e21e
LW
2580
2581 retry:
541ed3a9
FC
2582 if (CvCLONE(cv) && ! CvCLONED(cv))
2583 DIE(aTHX_ "Closure prototype called");
a0d0e21e 2584 if (!CvROOT(cv) && !CvXSUB(cv)) {
2f349aa0
NC
2585 GV* autogv;
2586 SV* sub_name;
2587
2588 /* anonymous or undef'd function leaves us no recourse */
7d2057d8
FC
2589 if (CvANON(cv) || !(gv = CvGV(cv))) {
2590 if (CvNAMED(cv))
2591 DIE(aTHX_ "Undefined subroutine &%"HEKf" called",
2592 HEKfARG(CvNAME_HEK(cv)));
2f349aa0 2593 DIE(aTHX_ "Undefined subroutine called");
7d2057d8 2594 }
2f349aa0
NC
2595
2596 /* autoloaded stub? */
2597 if (cv != GvCV(gv)) {
2598 cv = GvCV(gv);
2599 }
2600 /* should call AUTOLOAD now? */
2601 else {
7e623da3 2602try_autoload:
d1089224
BF
2603 if ((autogv = gv_autoload_pvn(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv),
2604 GvNAMEUTF8(gv) ? SVf_UTF8 : 0)))
2f349aa0
NC
2605 {
2606 cv = GvCV(autogv);
2607 }
2f349aa0 2608 else {
c220e1a1 2609 sorry:
2f349aa0 2610 sub_name = sv_newmortal();
6136c704 2611 gv_efullname3(sub_name, gv, NULL);
be2597df 2612 DIE(aTHX_ "Undefined subroutine &%"SVf" called", SVfARG(sub_name));
2f349aa0
NC
2613 }
2614 }
2615 if (!cv)
c220e1a1 2616 goto sorry;
2f349aa0 2617 goto retry;
a0d0e21e
LW
2618 }
2619
54310121 2620 gimme = GIMME_V;
67caa1fe 2621 if ((PL_op->op_private & OPpENTERSUB_DB) && GvCV(PL_DBsub) && !CvNODEBUG(cv)) {
005a8a35 2622 Perl_get_db_sub(aTHX_ &sv, cv);
a9ef256d
NC
2623 if (CvISXSUB(cv))
2624 PL_curcopdb = PL_curcop;
1ad62f64 2625 if (CvLVALUE(cv)) {
2626 /* check for lsub that handles lvalue subroutines */
ae5c1e95 2627 cv = GvCV(gv_HVadd(gv_fetchpvs("DB::lsub", GV_ADDMULTI, SVt_PVHV)));
1ad62f64 2628 /* if lsub not found then fall back to DB::sub */
2629 if (!cv) cv = GvCV(PL_DBsub);
2630 } else {
2631 cv = GvCV(PL_DBsub);
2632 }
a9ef256d 2633
ccafdc96
RGS
2634 if (!cv || (!CvXSUB(cv) && !CvSTART(cv)))
2635 DIE(aTHX_ "No DB::sub routine defined");
67caa1fe 2636 }
a0d0e21e 2637
aed2304a 2638 if (!(CvISXSUB(cv))) {
f1025168 2639 /* This path taken at least 75% of the time */
a0d0e21e 2640 dMARK;
eb578fdb 2641 I32 items = SP - MARK;
b70d5558 2642 PADLIST * const padlist = CvPADLIST(cv);
a0d0e21e
LW
2643 PUSHBLOCK(cx, CXt_SUB, MARK);
2644 PUSHSUB(cx);
f39bc417 2645 cx->blk_sub.retop = PL_op->op_next;
a0d0e21e 2646 CvDEPTH(cv)++;
3a76ca88
RGS
2647 if (CvDEPTH(cv) >= 2) {
2648 PERL_STACK_OVERFLOW_CHECK();
2649 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2650 }
3a76ca88
RGS
2651 SAVECOMPPAD();
2652 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
2653 if (hasargs) {
10533ace 2654 AV *const av = MUTABLE_AV(PAD_SVl(0));
221373f0
GS
2655 if (AvREAL(av)) {
2656 /* @_ is normally not REAL--this should only ever
2657 * happen when DB::sub() calls things that modify @_ */
2658 av_clear(av);
2659 AvREAL_off(av);
2660 AvREIFY_on(av);
2661 }
3280af22 2662 cx->blk_sub.savearray = GvAV(PL_defgv);
502c6561 2663 GvAV(PL_defgv) = MUTABLE_AV(SvREFCNT_inc_simple(av));
dd2155a4 2664 CX_CURPAD_SAVE(cx->blk_sub);
6d4ff0d2 2665 cx->blk_sub.argarray = av;
a0d0e21e
LW
2666 ++MARK;
2667
77d27ef6
SF
2668 if (items - 1 > AvMAX(av)) {
2669 SV **ary = AvALLOC(av);
2670 AvMAX(av) = items - 1;
2671 Renew(ary, items, SV*);
2672 AvALLOC(av) = ary;
2673 AvARRAY(av) = ary;
2674 }
2675
a0d0e21e 2676 Copy(MARK,AvARRAY(av),items,SV*);
93965878 2677 AvFILLp(av) = items - 1;
1c846c1f 2678
b479c9f2 2679 MARK = AvARRAY(av);
a0d0e21e
LW
2680 while (items--) {
2681 if (*MARK)
b479c9f2
FC
2682 {
2683 if (SvPADTMP(*MARK) && !IS_PADGV(*MARK))
2684 *MARK = sv_mortalcopy(*MARK);
a0d0e21e 2685 SvTEMP_off(*MARK);
b479c9f2 2686 }
a0d0e21e
LW
2687 MARK++;
2688 }
2689 }
b479c9f2 2690 SAVETMPS;
da1dff94
FC
2691 if ((cx->blk_u16 & OPpENTERSUB_LVAL_MASK) == OPpLVAL_INTRO &&
2692 !CvLVALUE(cv))
2693 DIE(aTHX_ "Can't modify non-lvalue subroutine call");
4a925ff6
GS
2694 /* warning must come *after* we fully set up the context
2695 * stuff so that __WARN__ handlers can safely dounwind()
2696 * if they want to
2697 */
2b9dff67 2698 if (CvDEPTH(cv) == PERL_SUB_DEPTH_WARN && ckWARN(WARN_RECURSION)
4a925ff6
GS
2699 && !(PERLDB_SUB && cv == GvCV(PL_DBsub)))
2700 sub_crush_depth(cv);
a0d0e21e
LW
2701 RETURNOP(CvSTART(cv));
2702 }
f1025168 2703 else {
3a76ca88 2704 I32 markix = TOPMARK;
f1025168 2705
b479c9f2 2706 SAVETMPS;
3a76ca88 2707 PUTBACK;
f1025168 2708
4587c532
FC
2709 if (((PL_op->op_private
2710 & PUSHSUB_GET_LVALUE_MASK(Perl_is_lvalue_sub)
2711 ) & OPpENTERSUB_LVAL_MASK) == OPpLVAL_INTRO &&
2712 !CvLVALUE(cv))
2713 DIE(aTHX_ "Can't modify non-lvalue subroutine call");
2714
3a76ca88
RGS
2715 if (!hasargs) {
2716 /* Need to copy @_ to stack. Alternative may be to
2717 * switch stack to @_, and copy return values
2718 * back. This would allow popping @_ in XSUB, e.g.. XXXX */
2719 AV * const av = GvAV(PL_defgv);
2720 const I32 items = AvFILLp(av) + 1; /* @_ is not tieable */
2721
2722 if (items) {
2723 /* Mark is at the end of the stack. */
2724 EXTEND(SP, items);
2725 Copy(AvARRAY(av), SP + 1, items, SV*);
2726 SP += items;
2727 PUTBACK ;
2728 }
2729 }
2730 /* We assume first XSUB in &DB::sub is the called one. */
2731 if (PL_curcopdb) {
2732 SAVEVPTR(PL_curcop);
2733 PL_curcop = PL_curcopdb;
2734 PL_curcopdb = NULL;
2735 }
2736 /* Do we need to open block here? XXXX */
72df79cf 2737
2738 /* CvXSUB(cv) must not be NULL because newXS() refuses NULL xsub address */
2739 assert(CvXSUB(cv));
16c91539 2740 CvXSUB(cv)(aTHX_ cv);
3a76ca88
RGS
2741
2742 /* Enforce some sanity in scalar context. */
2743 if (gimme == G_SCALAR && ++markix != PL_stack_sp - PL_stack_base ) {
2744 if (markix > PL_stack_sp - PL_stack_base)
2745 *(PL_stack_base + markix) = &PL_sv_undef;
2746 else
2747 *(PL_stack_base + markix) = *PL_stack_sp;
2748 PL_stack_sp = PL_stack_base + markix;
2749 }
a57c6685 2750 LEAVE;
f1025168
NC
2751 return NORMAL;
2752 }
a0d0e21e
LW
2753}
2754
44a8e56a 2755void
864dbfa3 2756Perl_sub_crush_depth(pTHX_ CV *cv)
44a8e56a 2757{
7918f24d
NC
2758 PERL_ARGS_ASSERT_SUB_CRUSH_DEPTH;
2759
44a8e56a 2760 if (CvANON(cv))
9014280d 2761 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on anonymous subroutine");
44a8e56a 2762 else {
07b2687d
LM
2763 HEK *const hek = CvNAME_HEK(cv);
2764 SV *tmpstr;
2765 if (hek) {
2766 tmpstr = sv_2mortal(newSVhek(hek));
2767 }
2768 else {
2769 tmpstr = sv_newmortal();
2770 gv_efullname3(tmpstr, CvGV(cv), NULL);
2771 }
35c1215d 2772 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on subroutine \"%"SVf"\"",
be2597df 2773 SVfARG(tmpstr));
44a8e56a
PP
2774 }
2775}
2776
a0d0e21e
LW
2777PP(pp_aelem)
2778{
97aff369 2779 dVAR; dSP;
a0d0e21e 2780 SV** svp;
a3b680e6 2781 SV* const elemsv = POPs;
d804643f 2782 IV elem = SvIV(elemsv);
502c6561 2783 AV *const av = MUTABLE_AV(POPs);
e1ec3a88
AL
2784 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
2785 const U32 defer = (PL_op->op_private & OPpLVAL_DEFER) && (elem > av_len(av));
4ad10a0b
VP
2786 const bool localizing = PL_op->op_private & OPpLVAL_INTRO;
2787 bool preeminent = TRUE;
be6c24e0 2788 SV *sv;
a0d0e21e 2789
e35c1634 2790 if (SvROK(elemsv) && !SvGAMAGIC(elemsv) && ckWARN(WARN_MISC))
95b63a38
JH
2791 Perl_warner(aTHX_ packWARN(WARN_MISC),
2792 "Use of reference \"%"SVf"\" as array index",
be2597df 2793 SVfARG(elemsv));
a0d0e21e
LW
2794 if (SvTYPE(av) != SVt_PVAV)
2795 RETPUSHUNDEF;
4ad10a0b
VP
2796
2797 if (localizing) {
2798 MAGIC *mg;
2799 HV *stash;
2800
2801 /* If we can determine whether the element exist,
2802 * Try to preserve the existenceness of a tied array
2803 * element by using EXISTS and DELETE if possible.
2804 * Fallback to FETCH and STORE otherwise. */
2805 if (SvCANEXISTDELETE(av))
2806 preeminent = av_exists(av, elem);
2807 }
2808
68dc0745 2809 svp = av_fetch(av, elem, lval && !defer);
a0d0e21e 2810 if (lval) {
2b573ace 2811#ifdef PERL_MALLOC_WRAP
2b573ace 2812 if (SvUOK(elemsv)) {
a9c4fd4e 2813 const UV uv = SvUV(elemsv);
2b573ace
JH
2814 elem = uv > IV_MAX ? IV_MAX : uv;
2815 }
2816 else if (SvNOK(elemsv))
2817 elem = (IV)SvNV(elemsv);
a3b680e6
AL
2818 if (elem > 0) {
2819 static const char oom_array_extend[] =
2820 "Out of memory during array extend"; /* Duplicated in av.c */
2b573ace 2821 MEM_WRAP_CHECK_1(elem,SV*,oom_array_extend);
a3b680e6 2822 }
2b573ace 2823#endif
3280af22 2824 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
2825 SV* lv;
2826 if (!defer)
cea2e8a9 2827 DIE(aTHX_ PL_no_aelem, elem);
68dc0745
PP
2828 lv = sv_newmortal();
2829 sv_upgrade(lv, SVt_PVLV);
2830 LvTYPE(lv) = 'y';
a0714e2c 2831 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
b37c2d43 2832 LvTARG(lv) = SvREFCNT_inc_simple(av);
68dc0745
PP
2833 LvTARGOFF(lv) = elem;
2834 LvTARGLEN(lv) = 1;
2835 PUSHs(lv);
2836 RETURN;
2837 }
4ad10a0b
VP
2838 if (localizing) {
2839 if (preeminent)
2840 save_aelem(av, elem, svp);
2841 else
2842 SAVEADELETE(av, elem);
2843 }
9026059d
GG
2844 else if (PL_op->op_private & OPpDEREF) {
2845 PUSHs(vivify_ref(*svp, PL_op->op_private & OPpDEREF));
2846 RETURN;
2847 }
a0d0e21e 2848 }
3280af22 2849 sv = (svp ? *svp : &PL_sv_undef);
39cf747a 2850 if (!lval && SvRMAGICAL(av) && SvGMAGICAL(sv)) /* see note in pp_helem() */
fd69380d 2851 mg_get(sv);
be6c24e0 2852 PUSHs(sv);
a0d0e21e
LW
2853 RETURN;
2854}
2855
9026059d 2856SV*
864dbfa3 2857Perl_vivify_ref(pTHX_ SV *sv, U32 to_what)
02a9e968 2858{
7918f24d
NC
2859 PERL_ARGS_ASSERT_VIVIFY_REF;
2860
5b295bef 2861 SvGETMAGIC(sv);
02a9e968
CS
2862 if (!SvOK(sv)) {
2863 if (SvREADONLY(sv))
cb077ed2 2864 Perl_croak_no_modify();
43230e26 2865 prepare_SV_for_RV(sv);
68dc0745 2866 switch (to_what) {
5f05dabc 2867 case OPpDEREF_SV:
561b68a9 2868 SvRV_set(sv, newSV(0));
5f05dabc
PP
2869 break;
2870 case OPpDEREF_AV:
ad64d0ec 2871 SvRV_set(sv, MUTABLE_SV(newAV()));
5f05dabc
PP
2872 break;
2873 case OPpDEREF_HV:
ad64d0ec 2874 SvRV_set(sv, MUTABLE_SV(newHV()));
5f05dabc
PP
2875 break;
2876 }
02a9e968
CS
2877 SvROK_on(sv);
2878 SvSETMAGIC(sv);
7e482323 2879 SvGETMAGIC(sv);
02a9e968 2880 }
9026059d
GG
2881 if (SvGMAGICAL(sv)) {
2882 /* copy the sv without magic to prevent magic from being
2883 executed twice */
2884 SV* msv = sv_newmortal();
2885 sv_setsv_nomg(msv, sv);
2886 return msv;
2887 }
2888 return sv;
02a9e968
CS
2889}
2890
a0d0e21e
LW
2891PP(pp_method)
2892{
97aff369 2893 dVAR; dSP;
890ce7af 2894 SV* const sv = TOPs;
f5d5a27c
CS
2895
2896 if (SvROK(sv)) {
890ce7af 2897 SV* const rsv = SvRV(sv);
f5d5a27c
CS
2898 if (SvTYPE(rsv) == SVt_PVCV) {
2899 SETs(rsv);
2900 RETURN;
2901 }
2902 }
2903
4608196e 2904 SETs(method_common(sv, NULL));
f5d5a27c
CS
2905 RETURN;
2906}
2907
2908PP(pp_method_named)
2909{
97aff369 2910 dVAR; dSP;
890ce7af 2911 SV* const sv = cSVOP_sv;
c158a4fd 2912 U32 hash = SvSHARED_HASH(sv);
f5d5a27c
CS
2913
2914 XPUSHs(method_common(sv, &hash));
2915 RETURN;
2916}
2917
2918STATIC SV *
2919S_method_common(pTHX_ SV* meth, U32* hashp)
2920{
97aff369 2921 dVAR;
a0d0e21e
LW
2922 SV* ob;
2923 GV* gv;
56304f61 2924 HV* stash;
a0714e2c 2925 SV *packsv = NULL;
f226e9be
FC
2926 SV * const sv = PL_stack_base + TOPMARK == PL_stack_sp
2927 ? (Perl_croak(aTHX_ "Can't call method \"%"SVf"\" without a "
2928 "package or object reference", SVfARG(meth)),
2929 (SV *)NULL)
2930 : *(PL_stack_base + TOPMARK + 1);
f5d5a27c 2931
7918f24d
NC
2932 PERL_ARGS_ASSERT_METHOD_COMMON;
2933
4f1b7578 2934 if (!sv)
7156e69a 2935 undefined:
a214957f
VP
2936 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" on an undefined value",
2937 SVfARG(meth));
4f1b7578 2938
5b295bef 2939 SvGETMAGIC(sv);
a0d0e21e 2940 if (SvROK(sv))
ad64d0ec 2941 ob = MUTABLE_SV(SvRV(sv));
7156e69a 2942 else if (!SvOK(sv)) goto undefined;
a77c16f7
FC
2943 else if (isGV_with_GP(sv)) {
2944 if (!GvIO(sv))
2945 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" "
2946 "without a package or object reference",
2947 SVfARG(meth));
2948 ob = sv;
2949 if (SvTYPE(ob) == SVt_PVLV && LvTYPE(ob) == 'y') {
2950 assert(!LvTARGLEN(ob));
2951 ob = LvTARG(ob);
2952 assert(ob);
2953 }
2954 *(PL_stack_base + TOPMARK + 1) = sv_2mortal(newRV(ob));
2955 }
a0d0e21e 2956 else {
89269094 2957 /* this isn't a reference */
a0d0e21e 2958 GV* iogv;
f937af42 2959 STRLEN packlen;
89269094 2960 const char * const packname = SvPV_nomg_const(sv, packlen);
b3ebc221 2961 const bool packname_is_utf8 = !!SvUTF8(sv);
89269094 2962 const HE* const he =
b3ebc221
NC
2963 (const HE *)hv_common(
2964 PL_stashcache, NULL, packname, packlen,
2965 packname_is_utf8 ? HVhek_UTF8 : 0, 0, NULL, 0
da6b625f
FC
2966 );
2967
89269094 2968 if (he) {
5e6396ae 2969 stash = INT2PTR(HV*,SvIV(HeVAL(he)));
103f5a36
NC
2970 DEBUG_o(Perl_deb(aTHX_ "PL_stashcache hit %p for '%"SVf"'\n",
2971 stash, sv));
081fc587 2972 goto fetch;
081fc587
AB
2973 }
2974
89269094 2975 if (!(iogv = gv_fetchpvn_flags(
da6b625f
FC
2976 packname, packlen, SVf_UTF8 * packname_is_utf8, SVt_PVIO
2977 )) ||
ad64d0ec 2978 !(ob=MUTABLE_SV(GvIO(iogv))))
a0d0e21e 2979 {
af09ea45 2980 /* this isn't the name of a filehandle either */
89269094 2981 if (!packlen)
834a4ddd 2982 {
7156e69a
FC
2983 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" "
2984 "without a package or object reference",
2985 SVfARG(meth));
834a4ddd 2986 }
af09ea45 2987 /* assume it's a package name */
f937af42 2988 stash = gv_stashpvn(packname, packlen, packname_is_utf8 ? SVf_UTF8 : 0);
0dae17bd
GS
2989 if (!stash)
2990 packsv = sv;
081fc587 2991 else {
d4c19fe8 2992 SV* const ref = newSViv(PTR2IV(stash));
f937af42 2993 (void)hv_store(PL_stashcache, packname,
c60dbbc3 2994 packname_is_utf8 ? -(I32)packlen : (I32)packlen, ref, 0);
103f5a36
NC
2995 DEBUG_o(Perl_deb(aTHX_ "PL_stashcache caching %p for '%"SVf"'\n",
2996 stash, sv));
7e8961ec 2997 }
ac91690f 2998 goto fetch;
a0d0e21e 2999 }
af09ea45 3000 /* it _is_ a filehandle name -- replace with a reference */
ad64d0ec 3001 *(PL_stack_base + TOPMARK + 1) = sv_2mortal(newRV(MUTABLE_SV(iogv)));
a0d0e21e
LW
3002 }
3003
1f3ffe4c 3004 /* if we got here, ob should be an object or a glob */
f0d43078 3005 if (!ob || !(SvOBJECT(ob)
a77c16f7 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 */