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pp_hot.c:pp_aassign: mortalise variable only if we have to
[perl5.git] / pp_hot.c
CommitLineData
a0d0e21e
LW
1/* pp_hot.c
2 *
1129b882
NC
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
a0d0e21e
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
9 */
10
11/*
12 * Then he heard Merry change the note, and up went the Horn-cry of Buckland,
13 * shaking the air.
14 *
4ac71550
TC
15 * Awake! Awake! Fear, Fire, Foes! Awake!
16 * Fire, Foes! Awake!
17 *
18 * [p.1007 of _The Lord of the Rings_, VI/viii: "The Scouring of the Shire"]
a0d0e21e
LW
19 */
20
166f8a29
DM
21/* This file contains 'hot' pp ("push/pop") functions that
22 * execute the opcodes that make up a perl program. A typical pp function
23 * expects to find its arguments on the stack, and usually pushes its
24 * results onto the stack, hence the 'pp' terminology. Each OP structure
25 * contains a pointer to the relevant pp_foo() function.
26 *
27 * By 'hot', we mean common ops whose execution speed is critical.
28 * By gathering them together into a single file, we encourage
29 * CPU cache hits on hot code. Also it could be taken as a warning not to
30 * change any code in this file unless you're sure it won't affect
31 * performance.
32 */
33
a0d0e21e 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_PP_HOT_C
a0d0e21e
LW
36#include "perl.h"
37
38/* Hot code. */
39
40PP(pp_const)
41{
97aff369 42 dVAR;
39644a26 43 dSP;
996c9baa 44 XPUSHs(cSVOP_sv);
a0d0e21e
LW
45 RETURN;
46}
47
48PP(pp_nextstate)
49{
97aff369 50 dVAR;
533c011a 51 PL_curcop = (COP*)PL_op;
a0d0e21e 52 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 53 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e 54 FREETMPS;
f410a211 55 PERL_ASYNC_CHECK();
a0d0e21e
LW
56 return NORMAL;
57}
58
59PP(pp_gvsv)
60{
97aff369 61 dVAR;
39644a26 62 dSP;
924508f0 63 EXTEND(SP,1);
533c011a 64 if (PL_op->op_private & OPpLVAL_INTRO)
1d7c1841 65 PUSHs(save_scalar(cGVOP_gv));
a0d0e21e 66 else
c69033f2 67 PUSHs(GvSVn(cGVOP_gv));
a0d0e21e
LW
68 RETURN;
69}
70
71PP(pp_null)
72{
97aff369 73 dVAR;
a0d0e21e
LW
74 return NORMAL;
75}
76
5d8673bc 77/* This is sometimes called directly by pp_coreargs and pp_grepstart. */
a0d0e21e
LW
78PP(pp_pushmark)
79{
97aff369 80 dVAR;
3280af22 81 PUSHMARK(PL_stack_sp);
a0d0e21e
LW
82 return NORMAL;
83}
84
85PP(pp_stringify)
86{
97aff369 87 dVAR; dSP; dTARGET;
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
325void
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 }
94bc412f
NC
786 return Perl_tied_method(aTHX_ "PRINT", mark - 1, MUTABLE_SV(io),
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
GS
952STATIC void
953S_do_oddball(pTHX_ HV *hash, SV **relem, SV **firstrelem)
954{
97aff369 955 dVAR;
7918f24d
NC
956
957 PERL_ARGS_ASSERT_DO_ODDBALL;
958
10c8fecd 959 if (*relem) {
6d822dc4 960 if (ckWARN(WARN_MISC)) {
a3b680e6 961 const char *err;
10c8fecd
GS
962 if (relem == firstrelem &&
963 SvROK(*relem) &&
964 (SvTYPE(SvRV(*relem)) == SVt_PVAV ||
965 SvTYPE(SvRV(*relem)) == SVt_PVHV))
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 ) {
1088 do_oddball(hash, lastrelem, firsthashrelem);
1089 /* we have lelem to reuse, it's not needed anymore */
1090 *(lastrelem+1) = &PL_sv_undef;
1091 }
1092
60edcf09
FC
1093 ENTER;
1094 SAVEFREESV(SvREFCNT_inc_simple_NN(sv));
a0d0e21e 1095 hv_clear(hash);
1c4ea384 1096 while (relem < lastrelem+odd) { /* gobble up all the rest */
5117ca91 1097 HE *didstore;
1c4ea384 1098 assert(*relem);
632b9d6f
FC
1099 /* Copy the key if aassign is called in lvalue context,
1100 to avoid having the next op modify our rhs. Copy
1101 it also if it is gmagical, lest it make the
1102 hv_store_ent call below croak, leaking the value. */
1103 sv = lval || SvGMAGICAL(*relem)
1104 ? sv_mortalcopy(*relem)
1105 : *relem;
45960564 1106 relem++;
1c4ea384 1107 assert(*relem);
632b9d6f
FC
1108 SvGETMAGIC(*relem);
1109 tmpstr = newSV(0);
1110 sv_setsv_nomg(tmpstr,*relem++); /* value */
a88bf2bc 1111 if (gimme == G_ARRAY) {
45960564
DM
1112 if (hv_exists_ent(hash, sv, 0))
1113 /* key overwrites an existing entry */
1114 duplicates += 2;
a88bf2bc 1115 else {
45960564
DM
1116 /* copy element back: possibly to an earlier
1117 * stack location if we encountered dups earlier */
1118 *topelem++ = sv;
1119 *topelem++ = tmpstr;
1120 }
1121 }
5117ca91 1122 didstore = hv_store_ent(hash,sv,tmpstr,0);
632b9d6f
FC
1123 if (magic) {
1124 if (!didstore) sv_2mortal(tmpstr);
1125 SvSETMAGIC(tmpstr);
1126 }
bbce6d69 1127 TAINT_NOT;
8e07c86e 1128 }
60edcf09 1129 LEAVE;
1c4ea384
RZ
1130 if (duplicates && gimme == G_ARRAY) {
1131 /* at this point we have removed the duplicate key/value
1132 * pairs from the stack, but the remaining values may be
1133 * wrong; i.e. with (a 1 a 2 b 3) on the stack we've removed
1134 * the (a 2), but the stack now probably contains
1135 * (a <freed> b 3), because { hv_save(a,1); hv_save(a,2) }
1136 * obliterates the earlier key. So refresh all values. */
1137 lastrelem -= duplicates;
1138 relem = firsthashrelem;
1139 while (relem < lastrelem+odd) {
1140 HE *he;
1141 he = hv_fetch_ent(hash, *relem++, 0, 0);
1142 *relem++ = (he ? HeVAL(he) : &PL_sv_undef);
1143 }
1144 }
1145 if (odd && gimme == G_ARRAY) lastrelem++;
a0d0e21e
LW
1146 }
1147 break;
1148 default:
6fc92669
GS
1149 if (SvIMMORTAL(sv)) {
1150 if (relem <= lastrelem)
1151 relem++;
1152 break;
a0d0e21e
LW
1153 }
1154 if (relem <= lastrelem) {
1c70fb82
FC
1155 if (
1156 SvTEMP(sv) && !SvSMAGICAL(sv) && SvREFCNT(sv) == 1 &&
1157 (!isGV_with_GP(sv) || SvFAKE(sv)) && ckWARN(WARN_MISC)
1158 )
1159 Perl_warner(aTHX_
1160 packWARN(WARN_MISC),
1161 "Useless assignment to a temporary"
1162 );
a0d0e21e
LW
1163 sv_setsv(sv, *relem);
1164 *(relem++) = sv;
1165 }
1166 else
3280af22 1167 sv_setsv(sv, &PL_sv_undef);
8ef24240 1168 SvSETMAGIC(sv);
a0d0e21e
LW
1169 break;
1170 }
1171 }
3280af22 1172 if (PL_delaymagic & ~DM_DELAY) {
985213f2
AB
1173 /* Will be used to set PL_tainting below */
1174 UV tmp_uid = PerlProc_getuid();
1175 UV tmp_euid = PerlProc_geteuid();
1176 UV tmp_gid = PerlProc_getgid();
1177 UV tmp_egid = PerlProc_getegid();
1178
3280af22 1179 if (PL_delaymagic & DM_UID) {
a0d0e21e 1180#ifdef HAS_SETRESUID
985213f2
AB
1181 (void)setresuid((PL_delaymagic & DM_RUID) ? PL_delaymagic_uid : (Uid_t)-1,
1182 (PL_delaymagic & DM_EUID) ? PL_delaymagic_euid : (Uid_t)-1,
fb934a90 1183 (Uid_t)-1);
56febc5e
AD
1184#else
1185# ifdef HAS_SETREUID
985213f2
AB
1186 (void)setreuid((PL_delaymagic & DM_RUID) ? PL_delaymagic_uid : (Uid_t)-1,
1187 (PL_delaymagic & DM_EUID) ? PL_delaymagic_euid : (Uid_t)-1);
56febc5e
AD
1188# else
1189# ifdef HAS_SETRUID
b28d0864 1190 if ((PL_delaymagic & DM_UID) == DM_RUID) {
985213f2 1191 (void)setruid(PL_delaymagic_uid);
b28d0864 1192 PL_delaymagic &= ~DM_RUID;
a0d0e21e 1193 }
56febc5e
AD
1194# endif /* HAS_SETRUID */
1195# ifdef HAS_SETEUID
b28d0864 1196 if ((PL_delaymagic & DM_UID) == DM_EUID) {
985213f2 1197 (void)seteuid(PL_delaymagic_euid);
b28d0864 1198 PL_delaymagic &= ~DM_EUID;
a0d0e21e 1199 }
56febc5e 1200# endif /* HAS_SETEUID */
b28d0864 1201 if (PL_delaymagic & DM_UID) {
985213f2 1202 if (PL_delaymagic_uid != PL_delaymagic_euid)
cea2e8a9 1203 DIE(aTHX_ "No setreuid available");
985213f2 1204 (void)PerlProc_setuid(PL_delaymagic_uid);
a0d0e21e 1205 }
56febc5e
AD
1206# endif /* HAS_SETREUID */
1207#endif /* HAS_SETRESUID */
985213f2
AB
1208 tmp_uid = PerlProc_getuid();
1209 tmp_euid = PerlProc_geteuid();
a0d0e21e 1210 }
3280af22 1211 if (PL_delaymagic & DM_GID) {
a0d0e21e 1212#ifdef HAS_SETRESGID
985213f2
AB
1213 (void)setresgid((PL_delaymagic & DM_RGID) ? PL_delaymagic_gid : (Gid_t)-1,
1214 (PL_delaymagic & DM_EGID) ? PL_delaymagic_egid : (Gid_t)-1,
fb934a90 1215 (Gid_t)-1);
56febc5e
AD
1216#else
1217# ifdef HAS_SETREGID
985213f2
AB
1218 (void)setregid((PL_delaymagic & DM_RGID) ? PL_delaymagic_gid : (Gid_t)-1,
1219 (PL_delaymagic & DM_EGID) ? PL_delaymagic_egid : (Gid_t)-1);
56febc5e
AD
1220# else
1221# ifdef HAS_SETRGID
b28d0864 1222 if ((PL_delaymagic & DM_GID) == DM_RGID) {
985213f2 1223 (void)setrgid(PL_delaymagic_gid);
b28d0864 1224 PL_delaymagic &= ~DM_RGID;
a0d0e21e 1225 }
56febc5e
AD
1226# endif /* HAS_SETRGID */
1227# ifdef HAS_SETEGID
b28d0864 1228 if ((PL_delaymagic & DM_GID) == DM_EGID) {
985213f2 1229 (void)setegid(PL_delaymagic_egid);
b28d0864 1230 PL_delaymagic &= ~DM_EGID;
a0d0e21e 1231 }
56febc5e 1232# endif /* HAS_SETEGID */
b28d0864 1233 if (PL_delaymagic & DM_GID) {
985213f2 1234 if (PL_delaymagic_gid != PL_delaymagic_egid)
cea2e8a9 1235 DIE(aTHX_ "No setregid available");
985213f2 1236 (void)PerlProc_setgid(PL_delaymagic_gid);
a0d0e21e 1237 }
56febc5e
AD
1238# endif /* HAS_SETREGID */
1239#endif /* HAS_SETRESGID */
985213f2
AB
1240 tmp_gid = PerlProc_getgid();
1241 tmp_egid = PerlProc_getegid();
a0d0e21e 1242 }
284167a5 1243 TAINTING_set( TAINTING_get | (tmp_uid && (tmp_euid != tmp_uid || tmp_egid != tmp_gid)) );
a0d0e21e 1244 }
3280af22 1245 PL_delaymagic = 0;
54310121 1246
54310121
PP
1247 if (gimme == G_VOID)
1248 SP = firstrelem - 1;
1249 else if (gimme == G_SCALAR) {
1250 dTARGET;
1251 SP = firstrelem;
231cbeb2 1252 SETi(lastrelem - firstrelem + 1);
54310121
PP
1253 }
1254 else {
1c4ea384 1255 if (ary || hash)
a0d0e21e 1256 SP = lastrelem;
1c4ea384 1257 else {
a0d0e21e 1258 SP = firstrelem + (lastlelem - firstlelem);
1c4ea384
RZ
1259 lelem = firstlelem + (relem - firstrelem);
1260 while (relem <= SP)
1261 *relem++ = (lelem <= lastlelem) ? *lelem++ : &PL_sv_undef;
1262 }
a0d0e21e 1263 }
08aeb9f7 1264
54310121 1265 RETURN;
a0d0e21e
LW
1266}
1267
8782bef2
GB
1268PP(pp_qr)
1269{
97aff369 1270 dVAR; dSP;
eb578fdb 1271 PMOP * const pm = cPMOP;
fe578d7f 1272 REGEXP * rx = PM_GETRE(pm);
10599a69 1273 SV * const pkg = rx ? CALLREG_PACKAGE(rx) : NULL;
c4420975 1274 SV * const rv = sv_newmortal();
d63c20f2
DM
1275 CV **cvp;
1276 CV *cv;
288b8c02
NC
1277
1278 SvUPGRADE(rv, SVt_IV);
c2123ae3
NC
1279 /* For a subroutine describing itself as "This is a hacky workaround" I'm
1280 loathe to use it here, but it seems to be the right fix. Or close.
1281 The key part appears to be that it's essential for pp_qr to return a new
1282 object (SV), which implies that there needs to be an effective way to
1283 generate a new SV from the existing SV that is pre-compiled in the
1284 optree. */
1285 SvRV_set(rv, MUTABLE_SV(reg_temp_copy(NULL, rx)));
288b8c02
NC
1286 SvROK_on(rv);
1287
8d919b0a 1288 cvp = &( ReANY((REGEXP *)SvRV(rv))->qr_anoncv);
d63c20f2
DM
1289 if ((cv = *cvp) && CvCLONE(*cvp)) {
1290 *cvp = cv_clone(cv);
fc2b2dca 1291 SvREFCNT_dec_NN(cv);
d63c20f2
DM
1292 }
1293
288b8c02 1294 if (pkg) {
f815daf2 1295 HV *const stash = gv_stashsv(pkg, GV_ADD);
fc2b2dca 1296 SvREFCNT_dec_NN(pkg);
288b8c02
NC
1297 (void)sv_bless(rv, stash);
1298 }
1299
284167a5 1300 if (RX_ISTAINTED(rx)) {
e08e52cf 1301 SvTAINTED_on(rv);
9274aefd
DM
1302 SvTAINTED_on(SvRV(rv));
1303 }
c8c13c22 1304 XPUSHs(rv);
1305 RETURN;
8782bef2
GB
1306}
1307
a0d0e21e
LW
1308PP(pp_match)
1309{
97aff369 1310 dVAR; dSP; dTARG;
eb578fdb 1311 PMOP *pm = cPMOP;
d65afb4b 1312 PMOP *dynpm = pm;
eb578fdb
KW
1313 const char *t;
1314 const char *s;
5c144d81 1315 const char *strend;
a0d0e21e 1316 I32 global;
1ed74d04 1317 U8 r_flags = REXEC_CHECKED;
5c144d81 1318 const char *truebase; /* Start of string */
eb578fdb 1319 REGEXP *rx = PM_GETRE(pm);
b3eb6a9b 1320 bool rxtainted;
a3b680e6 1321 const I32 gimme = GIMME;
a0d0e21e 1322 STRLEN len;
748a9306 1323 I32 minmatch = 0;
a3b680e6 1324 const I32 oldsave = PL_savestack_ix;
f86702cc 1325 I32 update_minmatch = 1;
e60df1fa 1326 I32 had_zerolen = 0;
58e23c8d 1327 U32 gpos = 0;
a0d0e21e 1328
533c011a 1329 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 1330 TARG = POPs;
59f00321
RGS
1331 else if (PL_op->op_private & OPpTARGET_MY)
1332 GETTARGET;
a0d0e21e 1333 else {
54b9620d 1334 TARG = DEFSV;
a0d0e21e
LW
1335 EXTEND(SP,1);
1336 }
d9f424b2 1337
c277df42 1338 PUTBACK; /* EVAL blocks need stack_sp. */
69dc4b30
FC
1339 /* Skip get-magic if this is a qr// clone, because regcomp has
1340 already done it. */
8d919b0a 1341 s = ReANY(rx)->mother_re
69dc4b30
FC
1342 ? SvPV_nomg_const(TARG, len)
1343 : SvPV_const(TARG, len);
a0d0e21e 1344 if (!s)
2269b42e 1345 DIE(aTHX_ "panic: pp_match");
890ce7af 1346 strend = s + len;
284167a5
SM
1347 rxtainted = (RX_ISTAINTED(rx) ||
1348 (TAINT_get && (pm->op_pmflags & PMf_RETAINT)));
9212bbba 1349 TAINT_NOT;
a0d0e21e 1350
a30b2f1f 1351 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 1352
6c864ec2 1353 /* We need to know this in case we fail out early - pos() must be reset */
de0df3c0
MH
1354 global = dynpm->op_pmflags & PMf_GLOBAL;
1355
d65afb4b 1356 /* PMdf_USED is set after a ?? matches once */
c737faaf
YO
1357 if (
1358#ifdef USE_ITHREADS
1359 SvREADONLY(PL_regex_pad[pm->op_pmoffset])
1360#else
1361 pm->op_pmflags & PMf_USED
1362#endif
1363 ) {
e5dc5375 1364 DEBUG_r(PerlIO_printf(Perl_debug_log, "?? already matched once"));
de0df3c0 1365 goto nope;
a0d0e21e
LW
1366 }
1367
7e313637
FC
1368 /* empty pattern special-cased to use last successful pattern if
1369 possible, except for qr// */
8d919b0a 1370 if (!ReANY(rx)->mother_re && !RX_PRELEN(rx)
7e313637 1371 && PL_curpm) {
3280af22 1372 pm = PL_curpm;
aaa362c4 1373 rx = PM_GETRE(pm);
a0d0e21e 1374 }
d65afb4b 1375
e5dc5375
KW
1376 if (RX_MINLEN(rx) > (I32)len) {
1377 DEBUG_r(PerlIO_printf(Perl_debug_log, "String shorter than min possible regex match\n"));
de0df3c0 1378 goto nope;
e5dc5375 1379 }
c277df42 1380
a0d0e21e 1381 truebase = t = s;
ad94a511
IZ
1382
1383 /* XXXX What part of this is needed with true \G-support? */
de0df3c0 1384 if (global) {
07bc277f 1385 RX_OFFS(rx)[0].start = -1;
a0d0e21e 1386 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
c445ea15 1387 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
565764a8 1388 if (mg && mg->mg_len >= 0) {
07bc277f
NC
1389 if (!(RX_EXTFLAGS(rx) & RXf_GPOS_SEEN))
1390 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1391 else if (RX_EXTFLAGS(rx) & RXf_ANCH_GPOS) {
0ef3e39e 1392 r_flags |= REXEC_IGNOREPOS;
07bc277f
NC
1393 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1394 } else if (RX_EXTFLAGS(rx) & RXf_GPOS_FLOAT)
58e23c8d
YO
1395 gpos = mg->mg_len;
1396 else
07bc277f
NC
1397 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1398 minmatch = (mg->mg_flags & MGf_MINMATCH) ? RX_GOFS(rx) + 1 : 0;
f86702cc 1399 update_minmatch = 0;
748a9306 1400 }
a0d0e21e
LW
1401 }
1402 }
6e240d0b 1403#ifdef PERL_SAWAMPERSAND
a41aa44d 1404 if ( RX_NPARENS(rx)
6502e081 1405 || PL_sawampersand
6502e081 1406 || (RX_EXTFLAGS(rx) & (RXf_EVAL_SEEN|RXf_PMf_KEEPCOPY))
6e240d0b
FC
1407 )
1408#endif
1409 {
6502e081
DM
1410 r_flags |= (REXEC_COPY_STR|REXEC_COPY_SKIP_PRE);
1411 /* in @a =~ /(.)/g, we iterate multiple times, but copy the buffer
1412 * only on the first iteration. Therefore we need to copy $' as well
1413 * as $&, to make the rest of the string available for captures in
1414 * subsequent iterations */
1415 if (! (global && gimme == G_ARRAY))
1416 r_flags |= REXEC_COPY_SKIP_POST;
1417 };
22e551b9 1418
d7be1480 1419 play_it_again:
07bc277f
NC
1420 if (global && RX_OFFS(rx)[0].start != -1) {
1421 t = s = RX_OFFS(rx)[0].end + truebase - RX_GOFS(rx);
e5dc5375
KW
1422 if ((s + RX_MINLEN(rx)) > strend || s < truebase) {
1423 DEBUG_r(PerlIO_printf(Perl_debug_log, "Regex match can't succeed, so not even tried\n"));
a0d0e21e 1424 goto nope;
e5dc5375 1425 }
f86702cc 1426 if (update_minmatch++)
e60df1fa 1427 minmatch = had_zerolen;
a0d0e21e 1428 }
07bc277f 1429 if (RX_EXTFLAGS(rx) & RXf_USE_INTUIT &&
3c8556c3 1430 DO_UTF8(TARG) == (RX_UTF8(rx) != 0)) {
5c144d81
NC
1431 /* FIXME - can PL_bostr be made const char *? */
1432 PL_bostr = (char *)truebase;
f9f4320a 1433 s = CALLREG_INTUIT_START(rx, TARG, (char *)s, (char *)strend, r_flags, NULL);
f722798b
IZ
1434
1435 if (!s)
1436 goto nope;
6e240d0b 1437#ifdef PERL_SAWAMPERSAND
07bc277f 1438 if ( (RX_EXTFLAGS(rx) & RXf_CHECK_ALL)
14977893 1439 && !PL_sawampersand
07bc277f 1440 && !(RX_EXTFLAGS(rx) & RXf_PMf_KEEPCOPY)
05b4157f 1441 && !SvROK(TARG)) /* Cannot trust since INTUIT cannot guess ^ */
f722798b 1442 goto yup;
6e240d0b 1443#endif
a0d0e21e 1444 }
77da2310
NC
1445 if (!CALLREGEXEC(rx, (char*)s, (char *)strend, (char*)truebase,
1446 minmatch, TARG, NUM2PTR(void*, gpos), r_flags))
1447 goto ret_no;
1448
1449 PL_curpm = pm;
1450 if (dynpm->op_pmflags & PMf_ONCE) {
c737faaf 1451#ifdef USE_ITHREADS
77da2310 1452 SvREADONLY_on(PL_regex_pad[dynpm->op_pmoffset]);
c737faaf 1453#else
77da2310 1454 dynpm->op_pmflags |= PMf_USED;
c737faaf 1455#endif
a0d0e21e 1456 }
a0d0e21e
LW
1457
1458 gotcha:
72311751
GS
1459 if (rxtainted)
1460 RX_MATCH_TAINTED_on(rx);
1461 TAINT_IF(RX_MATCH_TAINTED(rx));
a0d0e21e 1462 if (gimme == G_ARRAY) {
07bc277f 1463 const I32 nparens = RX_NPARENS(rx);
a3b680e6 1464 I32 i = (global && !nparens) ? 1 : 0;
a0d0e21e 1465
c277df42 1466 SPAGAIN; /* EVAL blocks could move the stack. */
ffc61ed2
JH
1467 EXTEND(SP, nparens + i);
1468 EXTEND_MORTAL(nparens + i);
1469 for (i = !i; i <= nparens; i++) {
a0d0e21e 1470 PUSHs(sv_newmortal());
07bc277f
NC
1471 if ((RX_OFFS(rx)[i].start != -1) && RX_OFFS(rx)[i].end != -1 ) {
1472 const I32 len = RX_OFFS(rx)[i].end - RX_OFFS(rx)[i].start;
1473 s = RX_OFFS(rx)[i].start + truebase;
1474 if (RX_OFFS(rx)[i].end < 0 || RX_OFFS(rx)[i].start < 0 ||
290deeac 1475 len < 0 || len > strend - s)
5637ef5b
NC
1476 DIE(aTHX_ "panic: pp_match start/end pointers, i=%ld, "
1477 "start=%ld, end=%ld, s=%p, strend=%p, len=%"UVuf,
1478 (long) i, (long) RX_OFFS(rx)[i].start,
1479 (long)RX_OFFS(rx)[i].end, s, strend, (UV) len);
a0d0e21e 1480 sv_setpvn(*SP, s, len);
cce850e4 1481 if (DO_UTF8(TARG) && is_utf8_string((U8*)s, len))
a197cbdd 1482 SvUTF8_on(*SP);
a0d0e21e
LW
1483 }
1484 }
1485 if (global) {
d65afb4b 1486 if (dynpm->op_pmflags & PMf_CONTINUE) {
6136c704 1487 MAGIC* mg = NULL;
0af80b60
HS
1488 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
1489 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1490 if (!mg) {
d83f0a82
NC
1491#ifdef PERL_OLD_COPY_ON_WRITE
1492 if (SvIsCOW(TARG))
1493 sv_force_normal_flags(TARG, 0);
1494#endif
1495 mg = sv_magicext(TARG, NULL, PERL_MAGIC_regex_global,
1496 &PL_vtbl_mglob, NULL, 0);
0af80b60 1497 }
07bc277f
NC
1498 if (RX_OFFS(rx)[0].start != -1) {
1499 mg->mg_len = RX_OFFS(rx)[0].end;
1500 if (RX_OFFS(rx)[0].start + RX_GOFS(rx) == (UV)RX_OFFS(rx)[0].end)
0af80b60
HS
1501 mg->mg_flags |= MGf_MINMATCH;
1502 else
1503 mg->mg_flags &= ~MGf_MINMATCH;
1504 }
1505 }
07bc277f
NC
1506 had_zerolen = (RX_OFFS(rx)[0].start != -1
1507 && (RX_OFFS(rx)[0].start + RX_GOFS(rx)
1508 == (UV)RX_OFFS(rx)[0].end));
c277df42 1509 PUTBACK; /* EVAL blocks may use stack */
cf93c79d 1510 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
1511 goto play_it_again;
1512 }
ffc61ed2 1513 else if (!nparens)
bde848c5 1514 XPUSHs(&PL_sv_yes);
4633a7c4 1515 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1516 RETURN;
1517 }
1518 else {
1519 if (global) {
cbbf8932 1520 MAGIC* mg;
a0d0e21e 1521 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
14befaf4 1522 mg = mg_find(TARG, PERL_MAGIC_regex_global);
cbbf8932
AL
1523 else
1524 mg = NULL;
a0d0e21e 1525 if (!mg) {
d83f0a82
NC
1526#ifdef PERL_OLD_COPY_ON_WRITE
1527 if (SvIsCOW(TARG))
1528 sv_force_normal_flags(TARG, 0);
1529#endif
1530 mg = sv_magicext(TARG, NULL, PERL_MAGIC_regex_global,
1531 &PL_vtbl_mglob, NULL, 0);
a0d0e21e 1532 }
07bc277f
NC
1533 if (RX_OFFS(rx)[0].start != -1) {
1534 mg->mg_len = RX_OFFS(rx)[0].end;
1535 if (RX_OFFS(rx)[0].start + RX_GOFS(rx) == (UV)RX_OFFS(rx)[0].end)
748a9306
LW
1536 mg->mg_flags |= MGf_MINMATCH;
1537 else
1538 mg->mg_flags &= ~MGf_MINMATCH;
1539 }
a0d0e21e 1540 }
4633a7c4 1541 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1542 RETPUSHYES;
1543 }
1544
6e240d0b 1545#ifdef PERL_SAWAMPERSAND
f722798b 1546yup: /* Confirmed by INTUIT */
6e240d0b 1547#endif
72311751
GS
1548 if (rxtainted)
1549 RX_MATCH_TAINTED_on(rx);
1550 TAINT_IF(RX_MATCH_TAINTED(rx));
3280af22 1551 PL_curpm = pm;
c737faaf
YO
1552 if (dynpm->op_pmflags & PMf_ONCE) {
1553#ifdef USE_ITHREADS
1554 SvREADONLY_on(PL_regex_pad[dynpm->op_pmoffset]);
1555#else
1556 dynpm->op_pmflags |= PMf_USED;
1557#endif
1558 }
cf93c79d 1559 if (RX_MATCH_COPIED(rx))
07bc277f 1560 Safefree(RX_SUBBEG(rx));
cf93c79d 1561 RX_MATCH_COPIED_off(rx);
07bc277f 1562 RX_SUBBEG(rx) = NULL;
a0d0e21e 1563 if (global) {
5c144d81 1564 /* FIXME - should rx->subbeg be const char *? */
07bc277f 1565 RX_SUBBEG(rx) = (char *) truebase;
6502e081
DM
1566 RX_SUBOFFSET(rx) = 0;
1567 RX_SUBCOFFSET(rx) = 0;
07bc277f 1568 RX_OFFS(rx)[0].start = s - truebase;
a30b2f1f 1569 if (RX_MATCH_UTF8(rx)) {
07bc277f
NC
1570 char * const t = (char*)utf8_hop((U8*)s, RX_MINLENRET(rx));
1571 RX_OFFS(rx)[0].end = t - truebase;
60aeb6fd
NIS
1572 }
1573 else {
07bc277f 1574 RX_OFFS(rx)[0].end = s - truebase + RX_MINLENRET(rx);
60aeb6fd 1575 }
07bc277f 1576 RX_SUBLEN(rx) = strend - truebase;
a0d0e21e 1577 goto gotcha;
1c846c1f 1578 }
6e240d0b
FC
1579#ifdef PERL_SAWAMPERSAND
1580 if (PL_sawampersand || RX_EXTFLAGS(rx) & RXf_PMf_KEEPCOPY)
1581#endif
1582 {
14977893 1583 I32 off;
db2c6cb3
FC
1584#ifdef PERL_ANY_COW
1585 if (SvCANCOW(TARG)) {
ed252734
NC
1586 if (DEBUG_C_TEST) {
1587 PerlIO_printf(Perl_debug_log,
1588 "Copy on write: pp_match $& capture, type %d, truebase=%p, t=%p, difference %d\n",
6c9570dc 1589 (int) SvTYPE(TARG), (void*)truebase, (void*)t,
ed252734
NC
1590 (int)(t-truebase));
1591 }
bdd9a1b1
NC
1592 RX_SAVED_COPY(rx) = sv_setsv_cow(RX_SAVED_COPY(rx), TARG);
1593 RX_SUBBEG(rx)
1594 = (char *) SvPVX_const(RX_SAVED_COPY(rx)) + (t - truebase);
1595 assert (SvPOKp(RX_SAVED_COPY(rx)));
ed252734
NC
1596 } else
1597#endif
1598 {
14977893 1599
07bc277f 1600 RX_SUBBEG(rx) = savepvn(t, strend - t);
db2c6cb3 1601#ifdef PERL_ANY_COW
bdd9a1b1 1602 RX_SAVED_COPY(rx) = NULL;
ed252734
NC
1603#endif
1604 }
07bc277f 1605 RX_SUBLEN(rx) = strend - t;
6502e081
DM
1606 RX_SUBOFFSET(rx) = 0;
1607 RX_SUBCOFFSET(rx) = 0;
14977893 1608 RX_MATCH_COPIED_on(rx);
07bc277f
NC
1609 off = RX_OFFS(rx)[0].start = s - t;
1610 RX_OFFS(rx)[0].end = off + RX_MINLENRET(rx);
14977893 1611 }
6e240d0b 1612#ifdef PERL_SAWAMPERSAND
14977893 1613 else { /* startp/endp are used by @- @+. */
07bc277f
NC
1614 RX_OFFS(rx)[0].start = s - truebase;
1615 RX_OFFS(rx)[0].end = s - truebase + RX_MINLENRET(rx);
14977893 1616 }
6e240d0b 1617#endif
7e1a2c8d
DM
1618 /* match via INTUIT shouldn't have any captures. Let @-, @+, $^N know */
1619 assert(!RX_NPARENS(rx));
1620 RX_LASTPAREN(rx) = RX_LASTCLOSEPAREN(rx) = 0;
4633a7c4 1621 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1622 RETPUSHYES;
1623
1624nope:
a0d0e21e 1625ret_no:
d65afb4b 1626 if (global && !(dynpm->op_pmflags & PMf_CONTINUE)) {
a0d0e21e 1627 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
6136c704 1628 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1629 if (mg)
565764a8 1630 mg->mg_len = -1;
a0d0e21e
LW
1631 }
1632 }
4633a7c4 1633 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1634 if (gimme == G_ARRAY)
1635 RETURN;
1636 RETPUSHNO;
1637}
1638
1639OP *
864dbfa3 1640Perl_do_readline(pTHX)
a0d0e21e 1641{
27da23d5 1642 dVAR; dSP; dTARGETSTACKED;
eb578fdb 1643 SV *sv;
a0d0e21e
LW
1644 STRLEN tmplen = 0;
1645 STRLEN offset;
760ac839 1646 PerlIO *fp;
eb578fdb
KW
1647 IO * const io = GvIO(PL_last_in_gv);
1648 const I32 type = PL_op->op_type;
a3b680e6 1649 const I32 gimme = GIMME_V;
a0d0e21e 1650
6136c704 1651 if (io) {
50db69d8 1652 const MAGIC *const mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar);
6136c704 1653 if (mg) {
50db69d8 1654 Perl_tied_method(aTHX_ "READLINE", SP, MUTABLE_SV(io), mg, gimme, 0);
6136c704 1655 if (gimme == G_SCALAR) {
50db69d8
NC
1656 SPAGAIN;
1657 SvSetSV_nosteal(TARG, TOPs);
1658 SETTARG;
6136c704 1659 }
50db69d8 1660 return NORMAL;
0b7c7b4f 1661 }
e79b0511 1662 }
4608196e 1663 fp = NULL;
a0d0e21e
LW
1664 if (io) {
1665 fp = IoIFP(io);
1666 if (!fp) {
1667 if (IoFLAGS(io) & IOf_ARGV) {
1668 if (IoFLAGS(io) & IOf_START) {
a0d0e21e 1669 IoLINES(io) = 0;
3280af22 1670 if (av_len(GvAVn(PL_last_in_gv)) < 0) {
1d7c1841 1671 IoFLAGS(io) &= ~IOf_START;
4608196e 1672 do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,NULL);
4bac9ae4 1673 SvTAINTED_off(GvSVn(PL_last_in_gv)); /* previous tainting irrelevant */
76f68e9b 1674 sv_setpvs(GvSVn(PL_last_in_gv), "-");
3280af22 1675 SvSETMAGIC(GvSV(PL_last_in_gv));
a2008d6d
GS
1676 fp = IoIFP(io);
1677 goto have_fp;
a0d0e21e
LW
1678 }
1679 }
3280af22 1680 fp = nextargv(PL_last_in_gv);
a0d0e21e 1681 if (!fp) { /* Note: fp != IoIFP(io) */
3280af22 1682 (void)do_close(PL_last_in_gv, FALSE); /* now it does*/
a0d0e21e
LW
1683 }
1684 }
0d44d22b
NC
1685 else if (type == OP_GLOB)
1686 fp = Perl_start_glob(aTHX_ POPs, io);
a0d0e21e
LW
1687 }
1688 else if (type == OP_GLOB)
1689 SP--;
7716c5c5 1690 else if (IoTYPE(io) == IoTYPE_WRONLY) {
a5390457 1691 report_wrongway_fh(PL_last_in_gv, '>');
a00b5bd3 1692 }
a0d0e21e
LW
1693 }
1694 if (!fp) {
041457d9
DM
1695 if ((!io || !(IoFLAGS(io) & IOf_START))
1696 && ckWARN2(WARN_GLOB, WARN_CLOSED))
1697 {
3f4520fe 1698 if (type == OP_GLOB)
63922903 1699 Perl_ck_warner_d(aTHX_ packWARN(WARN_GLOB),
af8c498a
GS
1700 "glob failed (can't start child: %s)",
1701 Strerror(errno));
69282e91 1702 else
831e4cc3 1703 report_evil_fh(PL_last_in_gv);
3f4520fe 1704 }
54310121 1705 if (gimme == G_SCALAR) {
79628082 1706 /* undef TARG, and push that undefined value */
ba92458f
AE
1707 if (type != OP_RCATLINE) {
1708 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1709 SvOK_off(TARG);
ba92458f 1710 }
a0d0e21e
LW
1711 PUSHTARG;
1712 }
1713 RETURN;
1714 }
a2008d6d 1715 have_fp:
54310121 1716 if (gimme == G_SCALAR) {
a0d0e21e 1717 sv = TARG;
0f722b55
RGS
1718 if (type == OP_RCATLINE && SvGMAGICAL(sv))
1719 mg_get(sv);
48de12d9
RGS
1720 if (SvROK(sv)) {
1721 if (type == OP_RCATLINE)
5668452f 1722 SvPV_force_nomg_nolen(sv);
48de12d9
RGS
1723 else
1724 sv_unref(sv);
1725 }
f7877b28 1726 else if (isGV_with_GP(sv)) {
5668452f 1727 SvPV_force_nomg_nolen(sv);
f7877b28 1728 }
862a34c6 1729 SvUPGRADE(sv, SVt_PV);
a0d0e21e 1730 tmplen = SvLEN(sv); /* remember if already alloced */
e3918bb7 1731 if (!tmplen && !SvREADONLY(sv) && !SvIsCOW(sv)) {
f72e8700
JJ
1732 /* try short-buffering it. Please update t/op/readline.t
1733 * if you change the growth length.
1734 */
1735 Sv_Grow(sv, 80);
1736 }
2b5e58c4
AMS
1737 offset = 0;
1738 if (type == OP_RCATLINE && SvOK(sv)) {
1739 if (!SvPOK(sv)) {
5668452f 1740 SvPV_force_nomg_nolen(sv);
2b5e58c4 1741 }
a0d0e21e 1742 offset = SvCUR(sv);
2b5e58c4 1743 }
a0d0e21e 1744 }
54310121 1745 else {
561b68a9 1746 sv = sv_2mortal(newSV(80));
54310121
PP
1747 offset = 0;
1748 }
fbad3eb5 1749
3887d568
AP
1750 /* This should not be marked tainted if the fp is marked clean */
1751#define MAYBE_TAINT_LINE(io, sv) \
1752 if (!(IoFLAGS(io) & IOf_UNTAINT)) { \
1753 TAINT; \
1754 SvTAINTED_on(sv); \
1755 }
1756
684bef36 1757/* delay EOF state for a snarfed empty file */
fbad3eb5 1758#define SNARF_EOF(gimme,rs,io,sv) \
684bef36 1759 (gimme != G_SCALAR || SvCUR(sv) \
b9fee9ba 1760 || (IoFLAGS(io) & IOf_NOLINE) || !RsSNARF(rs))
fbad3eb5 1761
a0d0e21e 1762 for (;;) {
09e8efcc 1763 PUTBACK;
fbad3eb5 1764 if (!sv_gets(sv, fp, offset)
2d726892
TF
1765 && (type == OP_GLOB
1766 || SNARF_EOF(gimme, PL_rs, io, sv)
1767 || PerlIO_error(fp)))
fbad3eb5 1768 {
760ac839 1769 PerlIO_clearerr(fp);
a0d0e21e 1770 if (IoFLAGS(io) & IOf_ARGV) {
3280af22 1771 fp = nextargv(PL_last_in_gv);
a0d0e21e
LW
1772 if (fp)
1773 continue;
3280af22 1774 (void)do_close(PL_last_in_gv, FALSE);
a0d0e21e
LW
1775 }
1776 else if (type == OP_GLOB) {
a2a5de95
NC
1777 if (!do_close(PL_last_in_gv, FALSE)) {
1778 Perl_ck_warner(aTHX_ packWARN(WARN_GLOB),
1779 "glob failed (child exited with status %d%s)",
1780 (int)(STATUS_CURRENT >> 8),
1781 (STATUS_CURRENT & 0x80) ? ", core dumped" : "");
4eb79ab5 1782 }
a0d0e21e 1783 }
54310121 1784 if (gimme == G_SCALAR) {
ba92458f
AE
1785 if (type != OP_RCATLINE) {
1786 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1787 SvOK_off(TARG);
ba92458f 1788 }
09e8efcc 1789 SPAGAIN;
a0d0e21e
LW
1790 PUSHTARG;
1791 }
3887d568 1792 MAYBE_TAINT_LINE(io, sv);
a0d0e21e
LW
1793 RETURN;
1794 }
3887d568 1795 MAYBE_TAINT_LINE(io, sv);
a0d0e21e 1796 IoLINES(io)++;
b9fee9ba 1797 IoFLAGS(io) |= IOf_NOLINE;
71be2cbc 1798 SvSETMAGIC(sv);
09e8efcc 1799 SPAGAIN;
a0d0e21e 1800 XPUSHs(sv);
a0d0e21e 1801 if (type == OP_GLOB) {
349d4f2f 1802 const char *t1;
a0d0e21e 1803
3280af22 1804 if (SvCUR(sv) > 0 && SvCUR(PL_rs) > 0) {
6136c704 1805 char * const tmps = SvEND(sv) - 1;
aa07b2f6 1806 if (*tmps == *SvPVX_const(PL_rs)) {
c07a80fd 1807 *tmps = '\0';
b162af07 1808 SvCUR_set(sv, SvCUR(sv) - 1);
c07a80fd
PP
1809 }
1810 }
349d4f2f 1811 for (t1 = SvPVX_const(sv); *t1; t1++)
937b2e03 1812 if (!isALNUMC(*t1) &&
349d4f2f 1813 strchr("$&*(){}[]'\";\\|?<>~`", *t1))
a0d0e21e 1814 break;
349d4f2f 1815 if (*t1 && PerlLIO_lstat(SvPVX_const(sv), &PL_statbuf) < 0) {
a0d0e21e
LW
1816 (void)POPs; /* Unmatched wildcard? Chuck it... */
1817 continue;
1818 }
2d79bf7f 1819 } else if (SvUTF8(sv)) { /* OP_READLINE, OP_RCATLINE */
d4c19fe8
AL
1820 if (ckWARN(WARN_UTF8)) {
1821 const U8 * const s = (const U8*)SvPVX_const(sv) + offset;
1822 const STRLEN len = SvCUR(sv) - offset;
1823 const U8 *f;
1824
1825 if (!is_utf8_string_loc(s, len, &f))
1826 /* Emulate :encoding(utf8) warning in the same case. */
1827 Perl_warner(aTHX_ packWARN(WARN_UTF8),
1828 "utf8 \"\\x%02X\" does not map to Unicode",
1829 f < (U8*)SvEND(sv) ? *f : 0);
1830 }
a0d0e21e 1831 }
54310121 1832 if (gimme == G_ARRAY) {
a0d0e21e 1833 if (SvLEN(sv) - SvCUR(sv) > 20) {
1da4ca5f 1834 SvPV_shrink_to_cur(sv);
a0d0e21e 1835 }
561b68a9 1836 sv = sv_2mortal(newSV(80));
a0d0e21e
LW
1837 continue;
1838 }
54310121 1839 else if (gimme == G_SCALAR && !tmplen && SvLEN(sv) - SvCUR(sv) > 80) {
a0d0e21e 1840 /* try to reclaim a bit of scalar space (only on 1st alloc) */
d5b5861b
NC
1841 const STRLEN new_len
1842 = SvCUR(sv) < 60 ? 80 : SvCUR(sv)+40; /* allow some slop */
1da4ca5f 1843 SvPV_renew(sv, new_len);
a0d0e21e
LW
1844 }
1845 RETURN;
1846 }
1847}
1848
a0d0e21e
LW
1849PP(pp_helem)
1850{
97aff369 1851 dVAR; dSP;
760ac839 1852 HE* he;
ae77835f 1853 SV **svp;
c445ea15 1854 SV * const keysv = POPs;
85fbaab2 1855 HV * const hv = MUTABLE_HV(POPs);
a3b680e6
AL
1856 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
1857 const U32 defer = PL_op->op_private & OPpLVAL_DEFER;
be6c24e0 1858 SV *sv;
92970b93 1859 const bool localizing = PL_op->op_private & OPpLVAL_INTRO;
d30e492c 1860 bool preeminent = TRUE;
a0d0e21e 1861
d4c19fe8 1862 if (SvTYPE(hv) != SVt_PVHV)
a0d0e21e 1863 RETPUSHUNDEF;
d4c19fe8 1864
92970b93 1865 if (localizing) {
d4c19fe8
AL
1866 MAGIC *mg;
1867 HV *stash;
d30e492c
VP
1868
1869 /* If we can determine whether the element exist,
1870 * Try to preserve the existenceness of a tied hash
1871 * element by using EXISTS and DELETE if possible.
1872 * Fallback to FETCH and STORE otherwise. */
2c5f48c2 1873 if (SvCANEXISTDELETE(hv))
d30e492c 1874 preeminent = hv_exists_ent(hv, keysv, 0);
d4c19fe8 1875 }
d30e492c 1876
5f9d7e2b 1877 he = hv_fetch_ent(hv, keysv, lval && !defer, 0);
d4c19fe8 1878 svp = he ? &HeVAL(he) : NULL;
a0d0e21e 1879 if (lval) {
746f6409 1880 if (!svp || !*svp || *svp == &PL_sv_undef) {
68dc0745
PP
1881 SV* lv;
1882 SV* key2;
2d8e6c8d 1883 if (!defer) {
be2597df 1884 DIE(aTHX_ PL_no_helem_sv, SVfARG(keysv));
2d8e6c8d 1885 }
68dc0745
PP
1886 lv = sv_newmortal();
1887 sv_upgrade(lv, SVt_PVLV);
1888 LvTYPE(lv) = 'y';
6136c704 1889 sv_magic(lv, key2 = newSVsv(keysv), PERL_MAGIC_defelem, NULL, 0);
fc2b2dca 1890 SvREFCNT_dec_NN(key2); /* sv_magic() increments refcount */
b37c2d43 1891 LvTARG(lv) = SvREFCNT_inc_simple(hv);
68dc0745
PP
1892 LvTARGLEN(lv) = 1;
1893 PUSHs(lv);
1894 RETURN;
1895 }
92970b93 1896 if (localizing) {
bfcb3514 1897 if (HvNAME_get(hv) && isGV(*svp))
159b6efe 1898 save_gp(MUTABLE_GV(*svp), !(PL_op->op_flags & OPf_SPECIAL));
47cfc530
VP
1899 else if (preeminent)
1900 save_helem_flags(hv, keysv, svp,
1901 (PL_op->op_flags & OPf_SPECIAL) ? 0 : SAVEf_SETMAGIC);
1902 else
1903 SAVEHDELETE(hv, keysv);
5f05dabc 1904 }
9026059d
GG
1905 else if (PL_op->op_private & OPpDEREF) {
1906 PUSHs(vivify_ref(*svp, PL_op->op_private & OPpDEREF));
1907 RETURN;
1908 }
a0d0e21e 1909 }
746f6409 1910 sv = (svp && *svp ? *svp : &PL_sv_undef);
fd69380d
DM
1911 /* Originally this did a conditional C<sv = sv_mortalcopy(sv)>; this
1912 * was to make C<local $tied{foo} = $tied{foo}> possible.
1913 * However, it seems no longer to be needed for that purpose, and
1914 * introduced a new bug: stuff like C<while ($hash{taintedval} =~ /.../g>
1915 * would loop endlessly since the pos magic is getting set on the
1916 * mortal copy and lost. However, the copy has the effect of
1917 * triggering the get magic, and losing it altogether made things like
1918 * c<$tied{foo};> in void context no longer do get magic, which some
1919 * code relied on. Also, delayed triggering of magic on @+ and friends
1920 * meant the original regex may be out of scope by now. So as a
1921 * compromise, do the get magic here. (The MGf_GSKIP flag will stop it
1922 * being called too many times). */
39cf747a 1923 if (!lval && SvRMAGICAL(hv) && SvGMAGICAL(sv))
fd69380d 1924 mg_get(sv);
be6c24e0 1925 PUSHs(sv);
a0d0e21e
LW
1926 RETURN;
1927}
1928
a0d0e21e
LW
1929PP(pp_iter)
1930{
97aff369 1931 dVAR; dSP;
eb578fdb 1932 PERL_CONTEXT *cx;
7d6c2cef 1933 SV *oldsv;
1d7c1841 1934 SV **itersvp;
a0d0e21e 1935
924508f0 1936 EXTEND(SP, 1);
a0d0e21e 1937 cx = &cxstack[cxstack_ix];
1d7c1841 1938 itersvp = CxITERVAR(cx);
a48ce6be
DM
1939
1940 switch (CxTYPE(cx)) {
17c91640 1941
b552b52c
DM
1942 case CXt_LOOP_LAZYSV: /* string increment */
1943 {
1944 SV* cur = cx->blk_loop.state_u.lazysv.cur;
1945 SV *end = cx->blk_loop.state_u.lazysv.end;
1946 /* If the maximum is !SvOK(), pp_enteriter substitutes PL_sv_no.
1947 It has SvPVX of "" and SvCUR of 0, which is what we want. */
1948 STRLEN maxlen = 0;
1949 const char *max = SvPV_const(end, maxlen);
1950 if (SvNIOK(cur) || SvCUR(cur) > maxlen)
1951 RETPUSHNO;
1952
1953 oldsv = *itersvp;
1954 if (SvREFCNT(oldsv) == 1 && !SvMAGICAL(oldsv)) {
1955 /* safe to reuse old SV */
1956 sv_setsv(oldsv, cur);
a48ce6be 1957 }
b552b52c
DM
1958 else
1959 {
1960 /* we need a fresh SV every time so that loop body sees a
1961 * completely new SV for closures/references to work as
1962 * they used to */
1963 *itersvp = newSVsv(cur);
fc2b2dca 1964 SvREFCNT_dec_NN(oldsv);
b552b52c
DM
1965 }
1966 if (strEQ(SvPVX_const(cur), max))
1967 sv_setiv(cur, 0); /* terminate next time */
1968 else
1969 sv_inc(cur);
1970 break;
1971 }
a48ce6be 1972
fcef60b4
DM
1973 case CXt_LOOP_LAZYIV: /* integer increment */
1974 {
1975 IV cur = cx->blk_loop.state_u.lazyiv.cur;
1976 if (cur > cx->blk_loop.state_u.lazyiv.end)
89ea2908 1977 RETPUSHNO;
7f61b687 1978
fcef60b4 1979 oldsv = *itersvp;
3db8f154 1980 /* don't risk potential race */
fcef60b4 1981 if (SvREFCNT(oldsv) == 1 && !SvMAGICAL(oldsv)) {
eaa5c2d6 1982 /* safe to reuse old SV */
fcef60b4 1983 sv_setiv(oldsv, cur);
eaa5c2d6 1984 }
1c846c1f 1985 else
eaa5c2d6
GA
1986 {
1987 /* we need a fresh SV every time so that loop body sees a
1988 * completely new SV for closures/references to work as they
1989 * used to */
fcef60b4 1990 *itersvp = newSViv(cur);
fc2b2dca 1991 SvREFCNT_dec_NN(oldsv);
eaa5c2d6 1992 }
a2309040 1993
fcef60b4 1994 if (cur == IV_MAX) {
cdc1aa42
NC
1995 /* Handle end of range at IV_MAX */
1996 cx->blk_loop.state_u.lazyiv.end = IV_MIN;
1997 } else
1998 ++cx->blk_loop.state_u.lazyiv.cur;
a48ce6be 1999 break;
fcef60b4 2000 }
a48ce6be 2001
b552b52c 2002 case CXt_LOOP_FOR: /* iterate array */
7d6c2cef 2003 {
89ea2908 2004
7d6c2cef
DM
2005 AV *av = cx->blk_loop.state_u.ary.ary;
2006 SV *sv;
2007 bool av_is_stack = FALSE;
a8a20bb6 2008 IV ix;
7d6c2cef 2009
de080daa
DM
2010 if (!av) {
2011 av_is_stack = TRUE;
2012 av = PL_curstack;
2013 }
2014 if (PL_op->op_private & OPpITER_REVERSED) {
a8a20bb6
DM
2015 ix = --cx->blk_loop.state_u.ary.ix;
2016 if (ix <= (av_is_stack ? cx->blk_loop.resetsp : -1))
de080daa 2017 RETPUSHNO;
de080daa
DM
2018 }
2019 else {
a8a20bb6
DM
2020 ix = ++cx->blk_loop.state_u.ary.ix;
2021 if (ix > (av_is_stack ? cx->blk_oldsp : AvFILL(av)))
de080daa 2022 RETPUSHNO;
a8a20bb6 2023 }
de080daa 2024
a8a20bb6
DM
2025 if (SvMAGICAL(av) || AvREIFY(av)) {
2026 SV * const * const svp = av_fetch(av, ix, FALSE);
2027 sv = svp ? *svp : NULL;
2028 }
2029 else {
2030 sv = AvARRAY(av)[ix];
de080daa 2031 }
ef3e5ea9 2032
de080daa 2033 if (sv) {
f38aa882
DM
2034 if (SvIS_FREED(sv)) {
2035 *itersvp = NULL;
2036 Perl_croak(aTHX_ "Use of freed value in iteration");
2037 }
de080daa
DM
2038 SvTEMP_off(sv);
2039 SvREFCNT_inc_simple_void_NN(sv);
2040 }
2041 else
2042 sv = &PL_sv_undef;
f38aa882 2043
de080daa
DM
2044 if (!av_is_stack && sv == &PL_sv_undef) {
2045 SV *lv = newSV_type(SVt_PVLV);
2046 LvTYPE(lv) = 'y';
2047 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
2048 LvTARG(lv) = SvREFCNT_inc_simple(av);
f38aa882 2049 LvTARGOFF(lv) = ix;
de080daa
DM
2050 LvTARGLEN(lv) = (STRLEN)UV_MAX;
2051 sv = lv;
2052 }
a0d0e21e 2053
de080daa
DM
2054 oldsv = *itersvp;
2055 *itersvp = sv;
2056 SvREFCNT_dec(oldsv);
de080daa 2057 break;
7d6c2cef 2058 }
a48ce6be
DM
2059
2060 default:
2061 DIE(aTHX_ "panic: pp_iter, type=%u", CxTYPE(cx));
2062 }
b552b52c 2063 RETPUSHYES;
a0d0e21e
LW
2064}
2065
ef07e810
DM
2066/*
2067A description of how taint works in pattern matching and substitution.
2068
284167a5
SM
2069This is all conditional on NO_TAINT_SUPPORT not being defined. Under
2070NO_TAINT_SUPPORT, taint-related operations should become no-ops.
2071
4e19c54b 2072While the pattern is being assembled/concatenated and then compiled,
284167a5
SM
2073PL_tainted will get set (via TAINT_set) if any component of the pattern
2074is tainted, e.g. /.*$tainted/. At the end of pattern compilation,
2075the RXf_TAINTED flag is set on the pattern if PL_tainted is set (via
2076TAINT_get).
ef07e810 2077
0ab462a6
DM
2078When the pattern is copied, e.g. $r = qr/..../, the SV holding the ref to
2079the pattern is marked as tainted. This means that subsequent usage, such
284167a5
SM
2080as /x$r/, will set PL_tainted using TAINT_set, and thus RXf_TAINTED,
2081on the new pattern too.
ef07e810
DM
2082
2083During execution of a pattern, locale-variant ops such as ALNUML set the
2084local flag RF_tainted. At the end of execution, the engine sets the
0ab462a6
DM
2085RXf_TAINTED_SEEN on the pattern if RF_tainted got set, or clears it
2086otherwise.
ef07e810
DM
2087
2088In addition, RXf_TAINTED_SEEN is used post-execution by the get magic code
2089of $1 et al to indicate whether the returned value should be tainted.
2090It is the responsibility of the caller of the pattern (i.e. pp_match,
2091pp_subst etc) to set this flag for any other circumstances where $1 needs
2092to be tainted.
2093
2094The taint behaviour of pp_subst (and pp_substcont) is quite complex.
2095
2096There are three possible sources of taint
2097 * the source string
2098 * the pattern (both compile- and run-time, RXf_TAINTED / RXf_TAINTED_SEEN)
2099 * the replacement string (or expression under /e)
2100
2101There are four destinations of taint and they are affected by the sources
2102according to the rules below:
2103
2104 * the return value (not including /r):
2105 tainted by the source string and pattern, but only for the
2106 number-of-iterations case; boolean returns aren't tainted;
2107 * the modified string (or modified copy under /r):
2108 tainted by the source string, pattern, and replacement strings;
2109 * $1 et al:
2110 tainted by the pattern, and under 'use re "taint"', by the source
2111 string too;
2112 * PL_taint - i.e. whether subsequent code (e.g. in a /e block) is tainted:
2113 should always be unset before executing subsequent code.
2114
2115The overall action of pp_subst is:
2116
2117 * at the start, set bits in rxtainted indicating the taint status of
2118 the various sources.
2119
2120 * After each pattern execution, update the SUBST_TAINT_PAT bit in
2121 rxtainted if RXf_TAINTED_SEEN has been set, to indicate that the
2122 pattern has subsequently become tainted via locale ops.
2123
2124 * If control is being passed to pp_substcont to execute a /e block,
2125 save rxtainted in the CXt_SUBST block, for future use by
2126 pp_substcont.
2127
2128 * Whenever control is being returned to perl code (either by falling
2129 off the "end" of pp_subst/pp_substcont, or by entering a /e block),
2130 use the flag bits in rxtainted to make all the appropriate types of
0ab462a6
DM
2131 destination taint visible; e.g. set RXf_TAINTED_SEEN so that $1
2132 et al will appear tainted.
ef07e810
DM
2133
2134pp_match is just a simpler version of the above.
2135
2136*/
2137
a0d0e21e
LW
2138PP(pp_subst)
2139{
97aff369 2140 dVAR; dSP; dTARG;
eb578fdb 2141 PMOP *pm = cPMOP;
a0d0e21e 2142 PMOP *rpm = pm;
eb578fdb 2143 char *s;
a0d0e21e 2144 char *strend;
eb578fdb 2145 char *m;
5c144d81 2146 const char *c;
eb578fdb 2147 char *d;
a0d0e21e
LW
2148 STRLEN clen;
2149 I32 iters = 0;
2150 I32 maxiters;
eb578fdb 2151 I32 i;
a0d0e21e 2152 bool once;
ef07e810
DM
2153 U8 rxtainted = 0; /* holds various SUBST_TAINT_* flag bits.
2154 See "how taint works" above */
a0d0e21e 2155 char *orig;
1ed74d04 2156 U8 r_flags;
eb578fdb 2157 REGEXP *rx = PM_GETRE(pm);
a0d0e21e
LW
2158 STRLEN len;
2159 int force_on_match = 0;
0bcc34c2 2160 const I32 oldsave = PL_savestack_ix;
792b2c16 2161 STRLEN slen;
26a74523 2162 bool doutf8 = FALSE; /* whether replacement is in utf8 */
db2c6cb3 2163#ifdef PERL_ANY_COW
ed252734
NC
2164 bool is_cow;
2165#endif
a0714e2c 2166 SV *nsv = NULL;
b770e143 2167 /* known replacement string? */
eb578fdb 2168 SV *dstr = (pm->op_pmflags & PMf_CONST) ? POPs : NULL;
a0d0e21e 2169
f410a211
NC
2170 PERL_ASYNC_CHECK();
2171
533c011a 2172 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 2173 TARG = POPs;
59f00321
RGS
2174 else if (PL_op->op_private & OPpTARGET_MY)
2175 GETTARGET;
a0d0e21e 2176 else {
54b9620d 2177 TARG = DEFSV;
a0d0e21e 2178 EXTEND(SP,1);
1c846c1f 2179 }
d9f424b2 2180
64534138 2181 SvGETMAGIC(TARG); /* must come before cow check */
db2c6cb3 2182#ifdef PERL_ANY_COW
ed252734
NC
2183 /* Awooga. Awooga. "bool" types that are actually char are dangerous,
2184 because they make integers such as 256 "false". */
2185 is_cow = SvIsCOW(TARG) ? TRUE : FALSE;
2186#else
765f542d
NC
2187 if (SvIsCOW(TARG))
2188 sv_force_normal_flags(TARG,0);
ed252734 2189#endif
8ca8a454 2190 if (!(rpm->op_pmflags & PMf_NONDESTRUCT)
db2c6cb3 2191#ifdef PERL_ANY_COW
8ca8a454 2192 && !is_cow
ed252734 2193#endif
8ca8a454
NC
2194 && (SvREADONLY(TARG)
2195 || ( ((SvTYPE(TARG) == SVt_PVGV && isGV_with_GP(TARG))
2196 || SvTYPE(TARG) > SVt_PVLV)
2197 && !(SvTYPE(TARG) == SVt_PVGV && SvFAKE(TARG)))))
cb077ed2 2198 Perl_croak_no_modify();
8ec5e241
NIS
2199 PUTBACK;
2200
64534138 2201 s = SvPV_nomg(TARG, len);
4499db73 2202 if (!SvPOKp(TARG) || SvTYPE(TARG) == SVt_PVGV || SvVOK(TARG))
a0d0e21e 2203 force_on_match = 1;
20be6587
DM
2204
2205 /* only replace once? */
2206 once = !(rpm->op_pmflags & PMf_GLOBAL);
2207
ef07e810 2208 /* See "how taint works" above */
284167a5 2209 if (TAINTING_get) {
20be6587
DM
2210 rxtainted = (
2211 (SvTAINTED(TARG) ? SUBST_TAINT_STR : 0)
284167a5 2212 | (RX_ISTAINTED(rx) ? SUBST_TAINT_PAT : 0)
20be6587
DM
2213 | ((pm->op_pmflags & PMf_RETAINT) ? SUBST_TAINT_RETAINT : 0)
2214 | ((once && !(rpm->op_pmflags & PMf_NONDESTRUCT))
2215 ? SUBST_TAINT_BOOLRET : 0));
2216 TAINT_NOT;
2217 }
a12c0f56 2218
a30b2f1f 2219 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 2220
a0d0e21e
LW
2221 force_it:
2222 if (!pm || !s)
5637ef5b 2223 DIE(aTHX_ "panic: pp_subst, pm=%p, s=%p", pm, s);
a0d0e21e
LW
2224
2225 strend = s + len;
a30b2f1f 2226 slen = RX_MATCH_UTF8(rx) ? utf8_length((U8*)s, (U8*)strend) : len;
792b2c16
JH
2227 maxiters = 2 * slen + 10; /* We can match twice at each
2228 position, once with zero-length,
2229 second time with non-zero. */
a0d0e21e 2230
6a97c51d 2231 if (!RX_PRELEN(rx) && PL_curpm
8d919b0a 2232 && !ReANY(rx)->mother_re) {
3280af22 2233 pm = PL_curpm;
aaa362c4 2234 rx = PM_GETRE(pm);
a0d0e21e 2235 }
6502e081 2236
6e240d0b 2237#ifdef PERL_SAWAMPERSAND
6502e081
DM
2238 r_flags = ( RX_NPARENS(rx)
2239 || PL_sawampersand
6502e081
DM
2240 || (RX_EXTFLAGS(rx) & (RXf_EVAL_SEEN|RXf_PMf_KEEPCOPY))
2241 )
2242 ? REXEC_COPY_STR
2243 : 0;
6e240d0b
FC
2244#else
2245 r_flags = REXEC_COPY_STR;
2246#endif
7fba1cd6 2247
a0d0e21e 2248 orig = m = s;
07bc277f 2249 if (RX_EXTFLAGS(rx) & RXf_USE_INTUIT) {
ee0b7718 2250 PL_bostr = orig;
f9f4320a 2251 s = CALLREG_INTUIT_START(rx, TARG, s, strend, r_flags, NULL);
f722798b
IZ
2252
2253 if (!s)
df34c13a 2254 goto ret_no;
f722798b 2255 /* How to do it in subst? */
07bc277f 2256/* if ( (RX_EXTFLAGS(rx) & RXf_CHECK_ALL)
1c846c1f 2257 && !PL_sawampersand
a91cc451 2258 && !(RX_EXTFLAGS(rx) & RXf_KEEPCOPY))
f722798b
IZ
2259 goto yup;
2260*/
a0d0e21e 2261 }
71be2cbc 2262
8b64c330
DM
2263 if (!CALLREGEXEC(rx, s, strend, orig, 0, TARG, NULL,
2264 r_flags | REXEC_CHECKED))
2265 {
5e79dfb9
DM
2266 ret_no:
2267 SPAGAIN;
2268 PUSHs(rpm->op_pmflags & PMf_NONDESTRUCT ? TARG : &PL_sv_no);
2269 LEAVE_SCOPE(oldsave);
2270 RETURN;
2271 }
2272
1754320d
FC
2273 PL_curpm = pm;
2274
71be2cbc 2275 /* known replacement string? */
f272994b 2276 if (dstr) {
8514a05a
JH
2277 /* replacement needing upgrading? */
2278 if (DO_UTF8(TARG) && !doutf8) {
db79b45b 2279 nsv = sv_newmortal();
4a176938 2280 SvSetSV(nsv, dstr);
8514a05a
JH
2281 if (PL_encoding)
2282 sv_recode_to_utf8(nsv, PL_encoding);
2283 else
2284 sv_utf8_upgrade(nsv);
5c144d81 2285 c = SvPV_const(nsv, clen);
4a176938
JH
2286 doutf8 = TRUE;
2287 }
2288 else {
5c144d81 2289 c = SvPV_const(dstr, clen);
4a176938 2290 doutf8 = DO_UTF8(dstr);
8514a05a 2291 }
bb933b9b
FC
2292
2293 if (SvTAINTED(dstr))
2294 rxtainted |= SUBST_TAINT_REPL;
f272994b
A
2295 }
2296 else {
6136c704 2297 c = NULL;
f272994b
A
2298 doutf8 = FALSE;
2299 }
2300
71be2cbc 2301 /* can do inplace substitution? */
ed252734 2302 if (c
db2c6cb3 2303#ifdef PERL_ANY_COW
ed252734
NC
2304 && !is_cow
2305#endif
fbfb1899
DM
2306 && (I32)clen <= RX_MINLENRET(rx)
2307 && (once || !(r_flags & REXEC_COPY_STR))
1754320d 2308 && !(RX_EXTFLAGS(rx) & (RXf_LOOKBEHIND_SEEN|RXf_MODIFIES_VARS))
8ca8a454
NC
2309 && (!doutf8 || SvUTF8(TARG))
2310 && !(rpm->op_pmflags & PMf_NONDESTRUCT))
8b030b38 2311 {
ec911639 2312
db2c6cb3 2313#ifdef PERL_ANY_COW
ed252734 2314 if (SvIsCOW(TARG)) {
f7a8268c 2315 if (!force_on_match)
ed252734 2316 goto have_a_cow;
f7a8268c 2317 assert(SvVOK(TARG));
ed252734
NC
2318 }
2319#endif
71be2cbc
PP
2320 if (force_on_match) {
2321 force_on_match = 0;
5c1648b0 2322 s = SvPV_force_nomg(TARG, len);
71be2cbc
PP
2323 goto force_it;
2324 }
71be2cbc 2325 d = s;
71be2cbc 2326 if (once) {
20be6587
DM
2327 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2328 rxtainted |= SUBST_TAINT_PAT;
07bc277f
NC
2329 m = orig + RX_OFFS(rx)[0].start;
2330 d = orig + RX_OFFS(rx)[0].end;
71be2cbc
PP
2331 s = orig;
2332 if (m - s > strend - d) { /* faster to shorten from end */
2333 if (clen) {
2334 Copy(c, m, clen, char);
2335 m += clen;
a0d0e21e 2336 }
71be2cbc
PP
2337 i = strend - d;
2338 if (i > 0) {
2339 Move(d, m, i, char);
2340 m += i;
a0d0e21e 2341 }
71be2cbc
PP
2342 *m = '\0';
2343 SvCUR_set(TARG, m - s);
2344 }
155aba94 2345 else if ((i = m - s)) { /* faster from front */
71be2cbc
PP
2346 d -= clen;
2347 m = d;
0d3c21b0 2348 Move(s, d - i, i, char);
71be2cbc 2349 sv_chop(TARG, d-i);
71be2cbc
PP
2350 if (clen)
2351 Copy(c, m, clen, char);
2352 }
2353 else if (clen) {
2354 d -= clen;
2355 sv_chop(TARG, d);
2356 Copy(c, d, clen, char);
2357 }
2358 else {
2359 sv_chop(TARG, d);
2360 }
8ec5e241 2361 SPAGAIN;
8ca8a454 2362 PUSHs(&PL_sv_yes);
71be2cbc
PP
2363 }
2364 else {
71be2cbc
PP
2365 do {
2366 if (iters++ > maxiters)
cea2e8a9 2367 DIE(aTHX_ "Substitution loop");
20be6587
DM
2368 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2369 rxtainted |= SUBST_TAINT_PAT;
07bc277f 2370 m = RX_OFFS(rx)[0].start + orig;
155aba94 2371 if ((i = m - s)) {
71be2cbc
PP
2372 if (s != d)
2373 Move(s, d, i, char);
2374 d += i;
a0d0e21e 2375 }
71be2cbc
PP
2376 if (clen) {
2377 Copy(c, d, clen, char);
2378 d += clen;
2379 }
07bc277f 2380 s = RX_OFFS(rx)[0].end + orig;
f9f4320a 2381 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
f722798b
IZ
2382 TARG, NULL,
2383 /* don't match same null twice */
2384 REXEC_NOT_FIRST|REXEC_IGNOREPOS));
71be2cbc
PP
2385 if (s != d) {
2386 i = strend - s;
aa07b2f6 2387 SvCUR_set(TARG, d - SvPVX_const(TARG) + i);
71be2cbc 2388 Move(s, d, i+1, char); /* include the NUL */
a0d0e21e 2389 }
8ec5e241 2390 SPAGAIN;
8ca8a454 2391 mPUSHi((I32)iters);
a0d0e21e
LW
2392 }
2393 }
ff6e92e8 2394 else {
1754320d
FC
2395 bool first;
2396 SV *repl;
a0d0e21e
LW
2397 if (force_on_match) {
2398 force_on_match = 0;
0c1438a1
NC
2399 if (rpm->op_pmflags & PMf_NONDESTRUCT) {
2400 /* I feel that it should be possible to avoid this mortal copy
2401 given that the code below copies into a new destination.
2402 However, I suspect it isn't worth the complexity of
2403 unravelling the C<goto force_it> for the small number of
2404 cases where it would be viable to drop into the copy code. */
2405 TARG = sv_2mortal(newSVsv(TARG));
2406 }
5c1648b0 2407 s = SvPV_force_nomg(TARG, len);
a0d0e21e
LW
2408 goto force_it;
2409 }
db2c6cb3 2410#ifdef PERL_ANY_COW
ed252734
NC
2411 have_a_cow:
2412#endif
20be6587
DM
2413 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2414 rxtainted |= SUBST_TAINT_PAT;
1754320d 2415 repl = dstr;
815dd406 2416 dstr = newSVpvn_flags(m, s-m, SVs_TEMP | (DO_UTF8(TARG) ? SVf_UTF8 : 0));
a0d0e21e 2417 if (!c) {
eb578fdb 2418 PERL_CONTEXT *cx;
8ec5e241 2419 SPAGAIN;
20be6587
DM
2420 /* note that a whole bunch of local vars are saved here for
2421 * use by pp_substcont: here's a list of them in case you're
2422 * searching for places in this sub that uses a particular var:
2423 * iters maxiters r_flags oldsave rxtainted orig dstr targ
2424 * s m strend rx once */
a0d0e21e 2425 PUSHSUBST(cx);
20e98b0f 2426 RETURNOP(cPMOP->op_pmreplrootu.op_pmreplroot);
a0d0e21e 2427 }
cf93c79d 2428 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
1754320d 2429 first = TRUE;
a0d0e21e
LW
2430 do {
2431 if (iters++ > maxiters)
cea2e8a9 2432 DIE(aTHX_ "Substitution loop");
20be6587
DM
2433 if (RX_MATCH_TAINTED(rx))
2434 rxtainted |= SUBST_TAINT_PAT;
07bc277f 2435 if (RX_MATCH_COPIED(rx) && RX_SUBBEG(rx) != orig) {
a0d0e21e
LW
2436 m = s;
2437 s = orig;
6502e081 2438 assert(RX_SUBOFFSET(rx) == 0);
07bc277f 2439 orig = RX_SUBBEG(rx);
a0d0e21e
LW
2440 s = orig + (m - s);
2441 strend = s + (strend - m);
2442 }
07bc277f 2443 m = RX_OFFS(rx)[0].start + orig;
64534138 2444 sv_catpvn_nomg_maybeutf8(dstr, s, m - s, DO_UTF8(TARG));
07bc277f 2445 s = RX_OFFS(rx)[0].end + orig;
1754320d
FC
2446 if (first) {
2447 /* replacement already stringified */
2448 if (clen)
64534138 2449 sv_catpvn_nomg_maybeutf8(dstr, c, clen, doutf8);
1754320d
FC
2450 first = FALSE;
2451 }
2452 else {
1754320d
FC
2453 if (PL_encoding) {
2454 if (!nsv) nsv = sv_newmortal();
2455 sv_copypv(nsv, repl);
2456 if (!DO_UTF8(nsv)) sv_recode_to_utf8(nsv, PL_encoding);
2457 sv_catsv(dstr, nsv);
2458 }
2459 else sv_catsv(dstr, repl);
bb933b9b
FC
2460 if (SvTAINTED(repl))
2461 rxtainted |= SUBST_TAINT_REPL;
1754320d 2462 }
a0d0e21e
LW
2463 if (once)
2464 break;
f9f4320a 2465 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
ffc61ed2 2466 TARG, NULL, r_flags));
64534138 2467 sv_catpvn_nomg_maybeutf8(dstr, s, strend - s, DO_UTF8(TARG));
748a9306 2468
8ca8a454
NC
2469 if (rpm->op_pmflags & PMf_NONDESTRUCT) {
2470 /* From here on down we're using the copy, and leaving the original
2471 untouched. */
2472 TARG = dstr;
2473 SPAGAIN;
2474 PUSHs(dstr);
2475 } else {
db2c6cb3 2476#ifdef PERL_ANY_COW
8ca8a454
NC
2477 /* The match may make the string COW. If so, brilliant, because
2478 that's just saved us one malloc, copy and free - the regexp has
2479 donated the old buffer, and we malloc an entirely new one, rather
2480 than the regexp malloc()ing a buffer and copying our original,
2481 only for us to throw it away here during the substitution. */
2482 if (SvIsCOW(TARG)) {
2483 sv_force_normal_flags(TARG, SV_COW_DROP_PV);
2484 } else
ed252734 2485#endif
8ca8a454
NC
2486 {
2487 SvPV_free(TARG);
2488 }
2489 SvPV_set(TARG, SvPVX(dstr));
2490 SvCUR_set(TARG, SvCUR(dstr));
2491 SvLEN_set(TARG, SvLEN(dstr));
64534138 2492 SvFLAGS(TARG) |= SvUTF8(dstr);
8ca8a454 2493 SvPV_set(dstr, NULL);
748a9306 2494
8ca8a454 2495 SPAGAIN;
4f4d7508 2496 mPUSHi((I32)iters);
8ca8a454
NC
2497 }
2498 }
2499
2500 if (!(rpm->op_pmflags & PMf_NONDESTRUCT)) {
2501 (void)SvPOK_only_UTF8(TARG);
a0d0e21e 2502 }
20be6587 2503
ef07e810 2504 /* See "how taint works" above */
284167a5 2505 if (TAINTING_get) {
20be6587
DM
2506 if ((rxtainted & SUBST_TAINT_PAT) ||
2507 ((rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_RETAINT)) ==
2508 (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
2509 )
2510 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
2511
2512 if (!(rxtainted & SUBST_TAINT_BOOLRET)
2513 && (rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT))
2514 )
2515 SvTAINTED_on(TOPs); /* taint return value */
2516 else
2517 SvTAINTED_off(TOPs); /* may have got tainted earlier */
2518
2519 /* needed for mg_set below */
284167a5
SM
2520 TAINT_set(
2521 cBOOL(rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL))
2522 );
20be6587
DM
2523 SvTAINT(TARG);
2524 }
2525 SvSETMAGIC(TARG); /* PL_tainted must be correctly set for this mg_set */
2526 TAINT_NOT;
f1a76097
DM
2527 LEAVE_SCOPE(oldsave);
2528 RETURN;
a0d0e21e
LW
2529}
2530
2531PP(pp_grepwhile)
2532{
27da23d5 2533 dVAR; dSP;
a0d0e21e
LW
2534
2535 if (SvTRUEx(POPs))
3280af22
NIS
2536 PL_stack_base[PL_markstack_ptr[-1]++] = PL_stack_base[*PL_markstack_ptr];
2537 ++*PL_markstack_ptr;
b2a2a901 2538 FREETMPS;
d343c3ef 2539 LEAVE_with_name("grep_item"); /* exit inner scope */
a0d0e21e
LW
2540
2541 /* All done yet? */
3280af22 2542 if (PL_stack_base + *PL_markstack_ptr > SP) {
a0d0e21e 2543 I32 items;
c4420975 2544 const I32 gimme = GIMME_V;
a0d0e21e 2545
d343c3ef 2546 LEAVE_with_name("grep"); /* exit outer scope */
a0d0e21e 2547 (void)POPMARK; /* pop src */
3280af22 2548 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 2549 (void)POPMARK; /* pop dst */
3280af22 2550 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 2551 if (gimme == G_SCALAR) {
7cc47870 2552 if (PL_op->op_private & OPpGREP_LEX) {
c4420975 2553 SV* const sv = sv_newmortal();
7cc47870
RGS
2554 sv_setiv(sv, items);
2555 PUSHs(sv);
2556 }
2557 else {
2558 dTARGET;
2559 XPUSHi(items);
2560 }
a0d0e21e 2561 }
54310121
PP
2562 else if (gimme == G_ARRAY)
2563 SP += items;
a0d0e21e
LW
2564 RETURN;
2565 }
2566 else {
2567 SV *src;
2568
d343c3ef 2569 ENTER_with_name("grep_item"); /* enter inner scope */
1d7c1841 2570 SAVEVPTR(PL_curpm);
a0d0e21e 2571
3280af22 2572 src = PL_stack_base[*PL_markstack_ptr];
a0d0e21e 2573 SvTEMP_off(src);
59f00321
RGS
2574 if (PL_op->op_private & OPpGREP_LEX)
2575 PAD_SVl(PL_op->op_targ) = src;
2576 else
414bf5ae 2577 DEFSV_set(src);
a0d0e21e
LW
2578
2579 RETURNOP(cLOGOP->op_other);
2580 }
2581}
2582
2583PP(pp_leavesub)
2584{
27da23d5 2585 dVAR; dSP;
a0d0e21e
LW
2586 SV **mark;
2587 SV **newsp;
2588 PMOP *newpm;
2589 I32 gimme;
eb578fdb 2590 PERL_CONTEXT *cx;
b0d9ce38 2591 SV *sv;
a0d0e21e 2592
9850bf21
RH
2593 if (CxMULTICALL(&cxstack[cxstack_ix]))
2594 return 0;
2595
a0d0e21e 2596 POPBLOCK(cx,newpm);
5dd42e15 2597 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2598
a1f49e72 2599 TAINT_NOT;
a0d0e21e
LW
2600 if (gimme == G_SCALAR) {
2601 MARK = newsp + 1;
a29cdaf0 2602 if (MARK <= SP) {
a8bba7fa 2603 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
6f48390a
FC
2604 if (SvTEMP(TOPs) && SvREFCNT(TOPs) == 1
2605 && !SvMAGICAL(TOPs)) {
a29cdaf0
IZ
2606 *MARK = SvREFCNT_inc(TOPs);
2607 FREETMPS;
2608 sv_2mortal(*MARK);
cd06dffe
GS
2609 }
2610 else {
959e3673 2611 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
a29cdaf0 2612 FREETMPS;
959e3673 2613 *MARK = sv_mortalcopy(sv);
fc2b2dca 2614 SvREFCNT_dec_NN(sv);
a29cdaf0 2615 }
cd06dffe 2616 }
6f48390a
FC
2617 else if (SvTEMP(TOPs) && SvREFCNT(TOPs) == 1
2618 && !SvMAGICAL(TOPs)) {
767eda44 2619 *MARK = TOPs;
767eda44 2620 }
cd06dffe 2621 else
767eda44 2622 *MARK = sv_mortalcopy(TOPs);
cd06dffe
GS
2623 }
2624 else {
f86702cc 2625 MEXTEND(MARK, 0);
3280af22 2626 *MARK = &PL_sv_undef;
a0d0e21e
LW
2627 }
2628 SP = MARK;
2629 }
54310121 2630 else if (gimme == G_ARRAY) {
f86702cc 2631 for (MARK = newsp + 1; MARK <= SP; MARK++) {
6f48390a
FC
2632 if (!SvTEMP(*MARK) || SvREFCNT(*MARK) != 1
2633 || SvMAGICAL(*MARK)) {
f86702cc 2634 *MARK = sv_mortalcopy(*MARK);
a1f49e72
CS
2635 TAINT_NOT; /* Each item is independent */
2636 }
f86702cc 2637 }
a0d0e21e 2638 }
f86702cc 2639 PUTBACK;
1c846c1f 2640
a57c6685 2641 LEAVE;
5dd42e15 2642 cxstack_ix--;
b0d9ce38 2643 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
3280af22 2644 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e 2645
b0d9ce38 2646 LEAVESUB(sv);
f39bc417 2647 return cx->blk_sub.retop;
a0d0e21e
LW
2648}
2649
2650PP(pp_entersub)
2651{
27da23d5 2652 dVAR; dSP; dPOPss;
a0d0e21e 2653 GV *gv;
eb578fdb
KW
2654 CV *cv;
2655 PERL_CONTEXT *cx;
5d94fbed 2656 I32 gimme;
a9c4fd4e 2657 const bool hasargs = (PL_op->op_flags & OPf_STACKED) != 0;
a0d0e21e
LW
2658
2659 if (!sv)
cea2e8a9 2660 DIE(aTHX_ "Not a CODE reference");
a0d0e21e 2661 switch (SvTYPE(sv)) {
f1025168
NC
2662 /* This is overwhelming the most common case: */
2663 case SVt_PVGV:
13be902c 2664 we_have_a_glob:
159b6efe 2665 if (!(cv = GvCVu((const GV *)sv))) {
f730a42d 2666 HV *stash;
f2c0649b 2667 cv = sv_2cv(sv, &stash, &gv, 0);
f730a42d 2668 }
f1025168 2669 if (!cv) {
a57c6685 2670 ENTER;
f1025168
NC
2671 SAVETMPS;
2672 goto try_autoload;
2673 }
2674 break;
13be902c
FC
2675 case SVt_PVLV:
2676 if(isGV_with_GP(sv)) goto we_have_a_glob;
2677 /*FALLTHROUGH*/
a0d0e21e 2678 default:
7c75014e
DM
2679 if (sv == &PL_sv_yes) { /* unfound import, ignore */
2680 if (hasargs)
2681 SP = PL_stack_base + POPMARK;
4d198de3
DM
2682 else
2683 (void)POPMARK;
7c75014e
DM
2684 RETURN;
2685 }
2686 SvGETMAGIC(sv);
2687 if (SvROK(sv)) {
93d7320b
DM
2688 if (SvAMAGIC(sv)) {
2689 sv = amagic_deref_call(sv, to_cv_amg);
2690 /* Don't SPAGAIN here. */
2691 }
7c75014e
DM
2692 }
2693 else {
a9c4fd4e 2694 const char *sym;
780a5241 2695 STRLEN len;
79a3e5ea 2696 if (!SvOK(sv))
cea2e8a9 2697 DIE(aTHX_ PL_no_usym, "a subroutine");
79a3e5ea 2698 sym = SvPV_nomg_const(sv, len);
533c011a 2699 if (PL_op->op_private & HINT_STRICT_REFS)
b375e37b 2700 DIE(aTHX_ "Can't use string (\"%" SVf32 "\"%s) as a subroutine ref while \"strict refs\" in use", sv, len>32 ? "..." : "");
780a5241 2701 cv = get_cvn_flags(sym, len, GV_ADD|SvUTF8(sv));
a0d0e21e
LW
2702 break;
2703 }
ea726b52 2704 cv = MUTABLE_CV(SvRV(sv));
a0d0e21e
LW
2705 if (SvTYPE(cv) == SVt_PVCV)
2706 break;
2707 /* FALL THROUGH */
2708 case SVt_PVHV:
2709 case SVt_PVAV:
cea2e8a9 2710 DIE(aTHX_ "Not a CODE reference");
f1025168 2711 /* This is the second most common case: */
a0d0e21e 2712 case SVt_PVCV:
ea726b52 2713 cv = MUTABLE_CV(sv);
a0d0e21e 2714 break;
a0d0e21e
LW
2715 }
2716
a57c6685 2717 ENTER;
a0d0e21e
LW
2718 SAVETMPS;
2719
2720 retry:
541ed3a9
FC
2721 if (CvCLONE(cv) && ! CvCLONED(cv))
2722 DIE(aTHX_ "Closure prototype called");
a0d0e21e 2723 if (!CvROOT(cv) && !CvXSUB(cv)) {
2f349aa0
NC
2724 GV* autogv;
2725 SV* sub_name;
2726
2727 /* anonymous or undef'd function leaves us no recourse */
7d2057d8
FC
2728 if (CvANON(cv) || !(gv = CvGV(cv))) {
2729 if (CvNAMED(cv))
2730 DIE(aTHX_ "Undefined subroutine &%"HEKf" called",
2731 HEKfARG(CvNAME_HEK(cv)));
2f349aa0 2732 DIE(aTHX_ "Undefined subroutine called");
7d2057d8 2733 }
2f349aa0
NC
2734
2735 /* autoloaded stub? */
2736 if (cv != GvCV(gv)) {
2737 cv = GvCV(gv);
2738 }
2739 /* should call AUTOLOAD now? */
2740 else {
7e623da3 2741try_autoload:
d1089224
BF
2742 if ((autogv = gv_autoload_pvn(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv),
2743 GvNAMEUTF8(gv) ? SVf_UTF8 : 0)))
2f349aa0
NC
2744 {
2745 cv = GvCV(autogv);
2746 }
2f349aa0 2747 else {
c220e1a1 2748 sorry:
2f349aa0 2749 sub_name = sv_newmortal();
6136c704 2750 gv_efullname3(sub_name, gv, NULL);
be2597df 2751 DIE(aTHX_ "Undefined subroutine &%"SVf" called", SVfARG(sub_name));
2f349aa0
NC
2752 }
2753 }
2754 if (!cv)
c220e1a1 2755 goto sorry;
2f349aa0 2756 goto retry;
a0d0e21e
LW
2757 }
2758
54310121 2759 gimme = GIMME_V;
67caa1fe 2760 if ((PL_op->op_private & OPpENTERSUB_DB) && GvCV(PL_DBsub) && !CvNODEBUG(cv)) {
005a8a35 2761 Perl_get_db_sub(aTHX_ &sv, cv);
a9ef256d
NC
2762 if (CvISXSUB(cv))
2763 PL_curcopdb = PL_curcop;
1ad62f64 2764 if (CvLVALUE(cv)) {
2765 /* check for lsub that handles lvalue subroutines */
ae5c1e95 2766 cv = GvCV(gv_HVadd(gv_fetchpvs("DB::lsub", GV_ADDMULTI, SVt_PVHV)));
1ad62f64 2767 /* if lsub not found then fall back to DB::sub */
2768 if (!cv) cv = GvCV(PL_DBsub);
2769 } else {
2770 cv = GvCV(PL_DBsub);
2771 }
a9ef256d 2772
ccafdc96
RGS
2773 if (!cv || (!CvXSUB(cv) && !CvSTART(cv)))
2774 DIE(aTHX_ "No DB::sub routine defined");
67caa1fe 2775 }
a0d0e21e 2776
aed2304a 2777 if (!(CvISXSUB(cv))) {
f1025168 2778 /* This path taken at least 75% of the time */
a0d0e21e 2779 dMARK;
eb578fdb 2780 I32 items = SP - MARK;
b70d5558 2781 PADLIST * const padlist = CvPADLIST(cv);
a0d0e21e
LW
2782 PUSHBLOCK(cx, CXt_SUB, MARK);
2783 PUSHSUB(cx);
f39bc417 2784 cx->blk_sub.retop = PL_op->op_next;
a0d0e21e 2785 CvDEPTH(cv)++;
3a76ca88
RGS
2786 if (CvDEPTH(cv) >= 2) {
2787 PERL_STACK_OVERFLOW_CHECK();
2788 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2789 }
3a76ca88
RGS
2790 SAVECOMPPAD();
2791 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
2792 if (hasargs) {
10533ace 2793 AV *const av = MUTABLE_AV(PAD_SVl(0));
221373f0
GS
2794 if (AvREAL(av)) {
2795 /* @_ is normally not REAL--this should only ever
2796 * happen when DB::sub() calls things that modify @_ */
2797 av_clear(av);
2798 AvREAL_off(av);
2799 AvREIFY_on(av);
2800 }
3280af22 2801 cx->blk_sub.savearray = GvAV(PL_defgv);
502c6561 2802 GvAV(PL_defgv) = MUTABLE_AV(SvREFCNT_inc_simple(av));
dd2155a4 2803 CX_CURPAD_SAVE(cx->blk_sub);
6d4ff0d2 2804 cx->blk_sub.argarray = av;
a0d0e21e
LW
2805 ++MARK;
2806
2807 if (items > AvMAX(av) + 1) {
504618e9 2808 SV **ary = AvALLOC(av);
a0d0e21e
LW
2809 if (AvARRAY(av) != ary) {
2810 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
9c6bc640 2811 AvARRAY(av) = ary;
a0d0e21e
LW
2812 }
2813 if (items > AvMAX(av) + 1) {
2814 AvMAX(av) = items - 1;
2815 Renew(ary,items,SV*);
2816 AvALLOC(av) = ary;
9c6bc640 2817 AvARRAY(av) = ary;
a0d0e21e
LW
2818 }
2819 }
2820 Copy(MARK,AvARRAY(av),items,SV*);
93965878 2821 AvFILLp(av) = items - 1;
1c846c1f 2822
a0d0e21e
LW
2823 while (items--) {
2824 if (*MARK)
2825 SvTEMP_off(*MARK);
2826 MARK++;
2827 }
2828 }
da1dff94
FC
2829 if ((cx->blk_u16 & OPpENTERSUB_LVAL_MASK) == OPpLVAL_INTRO &&
2830 !CvLVALUE(cv))
2831 DIE(aTHX_ "Can't modify non-lvalue subroutine call");
4a925ff6
GS
2832 /* warning must come *after* we fully set up the context
2833 * stuff so that __WARN__ handlers can safely dounwind()
2834 * if they want to
2835 */
2b9dff67 2836 if (CvDEPTH(cv) == PERL_SUB_DEPTH_WARN && ckWARN(WARN_RECURSION)
4a925ff6
GS
2837 && !(PERLDB_SUB && cv == GvCV(PL_DBsub)))
2838 sub_crush_depth(cv);
a0d0e21e
LW
2839 RETURNOP(CvSTART(cv));
2840 }
f1025168 2841 else {
3a76ca88 2842 I32 markix = TOPMARK;
f1025168 2843
3a76ca88 2844 PUTBACK;
f1025168 2845
3a76ca88
RGS
2846 if (!hasargs) {
2847 /* Need to copy @_ to stack. Alternative may be to
2848 * switch stack to @_, and copy return values
2849 * back. This would allow popping @_ in XSUB, e.g.. XXXX */
2850 AV * const av = GvAV(PL_defgv);
2851 const I32 items = AvFILLp(av) + 1; /* @_ is not tieable */
2852
2853 if (items) {
2854 /* Mark is at the end of the stack. */
2855 EXTEND(SP, items);
2856 Copy(AvARRAY(av), SP + 1, items, SV*);
2857 SP += items;
2858 PUTBACK ;
2859 }
2860 }
2861 /* We assume first XSUB in &DB::sub is the called one. */
2862 if (PL_curcopdb) {
2863 SAVEVPTR(PL_curcop);
2864 PL_curcop = PL_curcopdb;
2865 PL_curcopdb = NULL;
2866 }
2867 /* Do we need to open block here? XXXX */
72df79cf 2868
2869 /* CvXSUB(cv) must not be NULL because newXS() refuses NULL xsub address */
2870 assert(CvXSUB(cv));
16c91539 2871 CvXSUB(cv)(aTHX_ cv);
3a76ca88
RGS
2872
2873 /* Enforce some sanity in scalar context. */
2874 if (gimme == G_SCALAR && ++markix != PL_stack_sp - PL_stack_base ) {
2875 if (markix > PL_stack_sp - PL_stack_base)
2876 *(PL_stack_base + markix) = &PL_sv_undef;
2877 else
2878 *(PL_stack_base + markix) = *PL_stack_sp;
2879 PL_stack_sp = PL_stack_base + markix;
2880 }
a57c6685 2881 LEAVE;
f1025168
NC
2882 return NORMAL;
2883 }
a0d0e21e
LW
2884}
2885
44a8e56a 2886void
864dbfa3 2887Perl_sub_crush_depth(pTHX_ CV *cv)
44a8e56a 2888{
7918f24d
NC
2889 PERL_ARGS_ASSERT_SUB_CRUSH_DEPTH;
2890
44a8e56a 2891 if (CvANON(cv))
9014280d 2892 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on anonymous subroutine");
44a8e56a 2893 else {
aec46f14 2894 SV* const tmpstr = sv_newmortal();
6136c704 2895 gv_efullname3(tmpstr, CvGV(cv), NULL);
35c1215d 2896 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on subroutine \"%"SVf"\"",
be2597df 2897 SVfARG(tmpstr));
44a8e56a
PP
2898 }
2899}
2900
a0d0e21e
LW
2901PP(pp_aelem)
2902{
97aff369 2903 dVAR; dSP;
a0d0e21e 2904 SV** svp;
a3b680e6 2905 SV* const elemsv = POPs;
d804643f 2906 IV elem = SvIV(elemsv);
502c6561 2907 AV *const av = MUTABLE_AV(POPs);
e1ec3a88
AL
2908 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
2909 const U32 defer = (PL_op->op_private & OPpLVAL_DEFER) && (elem > av_len(av));
4ad10a0b
VP
2910 const bool localizing = PL_op->op_private & OPpLVAL_INTRO;
2911 bool preeminent = TRUE;
be6c24e0 2912 SV *sv;
a0d0e21e 2913
e35c1634 2914 if (SvROK(elemsv) && !SvGAMAGIC(elemsv) && ckWARN(WARN_MISC))
95b63a38
JH
2915 Perl_warner(aTHX_ packWARN(WARN_MISC),
2916 "Use of reference \"%"SVf"\" as array index",
be2597df 2917 SVfARG(elemsv));
a0d0e21e
LW
2918 if (SvTYPE(av) != SVt_PVAV)
2919 RETPUSHUNDEF;
4ad10a0b
VP
2920
2921 if (localizing) {
2922 MAGIC *mg;
2923 HV *stash;
2924
2925 /* If we can determine whether the element exist,
2926 * Try to preserve the existenceness of a tied array
2927 * element by using EXISTS and DELETE if possible.
2928 * Fallback to FETCH and STORE otherwise. */
2929 if (SvCANEXISTDELETE(av))
2930 preeminent = av_exists(av, elem);
2931 }
2932
68dc0745 2933 svp = av_fetch(av, elem, lval && !defer);
a0d0e21e 2934 if (lval) {
2b573ace 2935#ifdef PERL_MALLOC_WRAP
2b573ace 2936 if (SvUOK(elemsv)) {
a9c4fd4e 2937 const UV uv = SvUV(elemsv);
2b573ace
JH
2938 elem = uv > IV_MAX ? IV_MAX : uv;
2939 }
2940 else if (SvNOK(elemsv))
2941 elem = (IV)SvNV(elemsv);
a3b680e6
AL
2942 if (elem > 0) {
2943 static const char oom_array_extend[] =
2944 "Out of memory during array extend"; /* Duplicated in av.c */
2b573ace 2945 MEM_WRAP_CHECK_1(elem,SV*,oom_array_extend);
a3b680e6 2946 }
2b573ace 2947#endif
3280af22 2948 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
2949 SV* lv;
2950 if (!defer)
cea2e8a9 2951 DIE(aTHX_ PL_no_aelem, elem);
68dc0745
PP
2952 lv = sv_newmortal();
2953 sv_upgrade(lv, SVt_PVLV);
2954 LvTYPE(lv) = 'y';
a0714e2c 2955 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
b37c2d43 2956 LvTARG(lv) = SvREFCNT_inc_simple(av);
68dc0745
PP
2957 LvTARGOFF(lv) = elem;
2958 LvTARGLEN(lv) = 1;
2959 PUSHs(lv);
2960 RETURN;
2961 }
4ad10a0b
VP
2962 if (localizing) {
2963 if (preeminent)
2964 save_aelem(av, elem, svp);
2965 else
2966 SAVEADELETE(av, elem);
2967 }
9026059d
GG
2968 else if (PL_op->op_private & OPpDEREF) {
2969 PUSHs(vivify_ref(*svp, PL_op->op_private & OPpDEREF));
2970 RETURN;
2971 }
a0d0e21e 2972 }
3280af22 2973 sv = (svp ? *svp : &PL_sv_undef);
39cf747a 2974 if (!lval && SvRMAGICAL(av) && SvGMAGICAL(sv)) /* see note in pp_helem() */
fd69380d 2975 mg_get(sv);
be6c24e0 2976 PUSHs(sv);
a0d0e21e
LW
2977 RETURN;
2978}
2979
9026059d 2980SV*
864dbfa3 2981Perl_vivify_ref(pTHX_ SV *sv, U32 to_what)
02a9e968 2982{
7918f24d
NC
2983 PERL_ARGS_ASSERT_VIVIFY_REF;
2984
5b295bef 2985 SvGETMAGIC(sv);
02a9e968
CS
2986 if (!SvOK(sv)) {
2987 if (SvREADONLY(sv))
cb077ed2 2988 Perl_croak_no_modify();
43230e26 2989 prepare_SV_for_RV(sv);
68dc0745 2990 switch (to_what) {
5f05dabc 2991 case OPpDEREF_SV:
561b68a9 2992 SvRV_set(sv, newSV(0));
5f05dabc
PP
2993 break;
2994 case OPpDEREF_AV:
ad64d0ec 2995 SvRV_set(sv, MUTABLE_SV(newAV()));
5f05dabc
PP
2996 break;
2997 case OPpDEREF_HV:
ad64d0ec 2998 SvRV_set(sv, MUTABLE_SV(newHV()));
5f05dabc
PP
2999 break;
3000 }
02a9e968
CS
3001 SvROK_on(sv);
3002 SvSETMAGIC(sv);
7e482323 3003 SvGETMAGIC(sv);
02a9e968 3004 }
9026059d
GG
3005 if (SvGMAGICAL(sv)) {
3006 /* copy the sv without magic to prevent magic from being
3007 executed twice */
3008 SV* msv = sv_newmortal();
3009 sv_setsv_nomg(msv, sv);
3010 return msv;
3011 }
3012 return sv;
02a9e968
CS
3013}
3014
a0d0e21e
LW
3015PP(pp_method)
3016{
97aff369 3017 dVAR; dSP;
890ce7af 3018 SV* const sv = TOPs;
f5d5a27c
CS
3019
3020 if (SvROK(sv)) {
890ce7af 3021 SV* const rsv = SvRV(sv);
f5d5a27c
CS
3022 if (SvTYPE(rsv) == SVt_PVCV) {
3023 SETs(rsv);
3024 RETURN;
3025 }
3026 }
3027
4608196e 3028 SETs(method_common(sv, NULL));
f5d5a27c
CS
3029 RETURN;
3030}
3031
3032PP(pp_method_named)
3033{
97aff369 3034 dVAR; dSP;
890ce7af 3035 SV* const sv = cSVOP_sv;
c158a4fd 3036 U32 hash = SvSHARED_HASH(sv);
f5d5a27c
CS
3037
3038 XPUSHs(method_common(sv, &hash));
3039 RETURN;
3040}
3041
3042STATIC SV *
3043S_method_common(pTHX_ SV* meth, U32* hashp)
3044{
97aff369 3045 dVAR;
a0d0e21e
LW
3046 SV* ob;
3047 GV* gv;
56304f61 3048 HV* stash;
a0714e2c 3049 SV *packsv = NULL;
f226e9be
FC
3050 SV * const sv = PL_stack_base + TOPMARK == PL_stack_sp
3051 ? (Perl_croak(aTHX_ "Can't call method \"%"SVf"\" without a "
3052 "package or object reference", SVfARG(meth)),
3053 (SV *)NULL)
3054 : *(PL_stack_base + TOPMARK + 1);
f5d5a27c 3055
7918f24d
NC
3056 PERL_ARGS_ASSERT_METHOD_COMMON;
3057
4f1b7578 3058 if (!sv)
7156e69a 3059 undefined:
a214957f
VP
3060 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" on an undefined value",
3061 SVfARG(meth));
4f1b7578 3062
5b295bef 3063 SvGETMAGIC(sv);
a0d0e21e 3064 if (SvROK(sv))
ad64d0ec 3065 ob = MUTABLE_SV(SvRV(sv));
7156e69a 3066 else if (!SvOK(sv)) goto undefined;
a0d0e21e 3067 else {
89269094 3068 /* this isn't a reference */
a0d0e21e 3069 GV* iogv;
f937af42 3070 STRLEN packlen;
89269094 3071 const char * const packname = SvPV_nomg_const(sv, packlen);
b3ebc221 3072 const bool packname_is_utf8 = !!SvUTF8(sv);
89269094 3073 const HE* const he =
b3ebc221
NC
3074 (const HE *)hv_common(
3075 PL_stashcache, NULL, packname, packlen,
3076 packname_is_utf8 ? HVhek_UTF8 : 0, 0, NULL, 0
da6b625f
FC
3077 );
3078
89269094 3079 if (he) {
5e6396ae 3080 stash = INT2PTR(HV*,SvIV(HeVAL(he)));
103f5a36
NC
3081 DEBUG_o(Perl_deb(aTHX_ "PL_stashcache hit %p for '%"SVf"'\n",
3082 stash, sv));
081fc587 3083 goto fetch;
081fc587
AB
3084 }
3085
89269094 3086 if (!(iogv = gv_fetchpvn_flags(
da6b625f
FC
3087 packname, packlen, SVf_UTF8 * packname_is_utf8, SVt_PVIO
3088 )) ||
ad64d0ec 3089 !(ob=MUTABLE_SV(GvIO(iogv))))
a0d0e21e 3090 {
af09ea45 3091 /* this isn't the name of a filehandle either */
89269094 3092 if (!packlen)
834a4ddd 3093 {
7156e69a
FC
3094 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" "
3095 "without a package or object reference",
3096 SVfARG(meth));
834a4ddd 3097 }
af09ea45 3098 /* assume it's a package name */
f937af42 3099 stash = gv_stashpvn(packname, packlen, packname_is_utf8 ? SVf_UTF8 : 0);
0dae17bd
GS
3100 if (!stash)
3101 packsv = sv;
081fc587 3102 else {
d4c19fe8 3103 SV* const ref = newSViv(PTR2IV(stash));
f937af42 3104 (void)hv_store(PL_stashcache, packname,
c60dbbc3 3105 packname_is_utf8 ? -(I32)packlen : (I32)packlen, ref, 0);
103f5a36
NC
3106 DEBUG_o(Perl_deb(aTHX_ "PL_stashcache caching %p for '%"SVf"'\n",
3107 stash, sv));
7e8961ec 3108 }
ac91690f 3109 goto fetch;
a0d0e21e 3110 }
af09ea45 3111 /* it _is_ a filehandle name -- replace with a reference */
ad64d0ec 3112 *(PL_stack_base + TOPMARK + 1) = sv_2mortal(newRV(MUTABLE_SV(iogv)));
a0d0e21e
LW
3113 }
3114
af09ea45 3115 /* if we got here, ob should be a reference or a glob */
f0d43078 3116 if (!ob || !(SvOBJECT(ob)
6e592b3a
BM
3117 || (SvTYPE(ob) == SVt_PVGV
3118 && isGV_with_GP(ob)
159b6efe 3119 && (ob = MUTABLE_SV(GvIO((const GV *)ob)))
f0d43078
GS
3120 && SvOBJECT(ob))))
3121 {
b375e37b
BF
3122 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" on unblessed reference",
3123 SVfARG((SvSCREAM(meth) && strEQ(SvPV_nolen_const(meth),"isa"))
3124 ? newSVpvs_flags("DOES", SVs_TEMP)
3125 : meth));
f0d43078 3126 }
a0d0e21e 3127
56304f61 3128 stash = SvSTASH(ob);
a0d0e21e 3129
ac91690f 3130 fetch:
af09ea45
IK
3131 /* NOTE: stash may be null, hope hv_fetch_ent and
3132 gv_fetchmethod can cope (it seems they can) */
3133
f5d5a27c
CS
3134 /* shortcut for simple names */
3135 if (hashp) {
b464bac0 3136 const HE* const he = hv_fetch_ent(stash, meth, 0, *hashp);
f5d5a27c 3137 if (he) {
159b6efe 3138 gv = MUTABLE_GV(HeVAL(he));
f5d5a27c 3139 if (isGV(gv) && GvCV(gv) &&
e1a479c5 3140 (!GvCVGEN(gv) || GvCVGEN(gv)
dd69841b 3141 == (PL_sub_generation + HvMROMETA(stash)->cache_gen)))
ad64d0ec 3142 return MUTABLE_SV(GvCV(gv));
f5d5a27c
CS
3143 }
3144 }
3145
f937af42
BF
3146 gv = gv_fetchmethod_sv_flags(stash ? stash : MUTABLE_HV(packsv),
3147 meth, GV_AUTOLOAD | GV_CROAK);
9b9d0b15 3148
256d1bb2 3149 assert(gv);
9b9d0b15 3150
ad64d0ec 3151 return isGV(gv) ? MUTABLE_SV(GvCV(gv)) : MUTABLE_SV(gv);
a0d0e21e 3152}
241d1a3b
NC
3153
3154/*
3155 * Local variables:
3156 * c-indentation-style: bsd
3157 * c-basic-offset: 4
14d04a33 3158 * indent-tabs-mode: nil
241d1a3b
NC
3159 * End:
3160 *
14d04a33 3161 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3162 */