This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
m// and s///; don't copy TEMP/AMAGIC strings
[perl5.git] / pp_hot.c
CommitLineData
a0d0e21e
LW
1/* pp_hot.c
2 *
1129b882
NC
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
a0d0e21e
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
9 */
10
11/*
12 * Then he heard Merry change the note, and up went the Horn-cry of Buckland,
13 * shaking the air.
14 *
4ac71550
TC
15 * Awake! Awake! Fear, Fire, Foes! Awake!
16 * Fire, Foes! Awake!
17 *
18 * [p.1007 of _The Lord of the Rings_, VI/viii: "The Scouring of the Shire"]
a0d0e21e
LW
19 */
20
166f8a29
DM
21/* This file contains 'hot' pp ("push/pop") functions that
22 * execute the opcodes that make up a perl program. A typical pp function
23 * expects to find its arguments on the stack, and usually pushes its
24 * results onto the stack, hence the 'pp' terminology. Each OP structure
25 * contains a pointer to the relevant pp_foo() function.
26 *
27 * By 'hot', we mean common ops whose execution speed is critical.
28 * By gathering them together into a single file, we encourage
29 * CPU cache hits on hot code. Also it could be taken as a warning not to
30 * change any code in this file unless you're sure it won't affect
31 * performance.
32 */
33
a0d0e21e 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_PP_HOT_C
a0d0e21e
LW
36#include "perl.h"
37
38/* Hot code. */
39
40PP(pp_const)
41{
97aff369 42 dVAR;
39644a26 43 dSP;
996c9baa 44 XPUSHs(cSVOP_sv);
a0d0e21e
LW
45 RETURN;
46}
47
48PP(pp_nextstate)
49{
97aff369 50 dVAR;
533c011a 51 PL_curcop = (COP*)PL_op;
a0d0e21e 52 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 53 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e 54 FREETMPS;
f410a211 55 PERL_ASYNC_CHECK();
a0d0e21e
LW
56 return NORMAL;
57}
58
59PP(pp_gvsv)
60{
97aff369 61 dVAR;
39644a26 62 dSP;
924508f0 63 EXTEND(SP,1);
533c011a 64 if (PL_op->op_private & OPpLVAL_INTRO)
1d7c1841 65 PUSHs(save_scalar(cGVOP_gv));
a0d0e21e 66 else
c69033f2 67 PUSHs(GvSVn(cGVOP_gv));
a0d0e21e
LW
68 RETURN;
69}
70
71PP(pp_null)
72{
97aff369 73 dVAR;
a0d0e21e
LW
74 return NORMAL;
75}
76
5d8673bc 77/* This is sometimes called directly by pp_coreargs and pp_grepstart. */
a0d0e21e
LW
78PP(pp_pushmark)
79{
97aff369 80 dVAR;
3280af22 81 PUSHMARK(PL_stack_sp);
a0d0e21e
LW
82 return NORMAL;
83}
84
85PP(pp_stringify)
86{
97aff369 87 dVAR; dSP; dTARGET;
6050d10e 88 sv_copypv(TARG,TOPs);
a0d0e21e
LW
89 SETTARG;
90 RETURN;
91}
92
93PP(pp_gv)
94{
97aff369 95 dVAR; dSP;
ad64d0ec 96 XPUSHs(MUTABLE_SV(cGVOP_gv));
a0d0e21e
LW
97 RETURN;
98}
99
100PP(pp_and)
101{
97aff369 102 dVAR; dSP;
f410a211 103 PERL_ASYNC_CHECK();
a0d0e21e
LW
104 if (!SvTRUE(TOPs))
105 RETURN;
106 else {
c960fc3b
SP
107 if (PL_op->op_type == OP_AND)
108 --SP;
a0d0e21e
LW
109 RETURNOP(cLOGOP->op_other);
110 }
111}
112
113PP(pp_sassign)
114{
3e75a3c4
RU
115 dVAR; dSP;
116 /* sassign keeps its args in the optree traditionally backwards.
117 So we pop them differently.
118 */
119 SV *left = POPs; SV *right = TOPs;
748a9306 120
533c011a 121 if (PL_op->op_private & OPpASSIGN_BACKWARDS) {
0bd48802
AL
122 SV * const temp = left;
123 left = right; right = temp;
a0d0e21e 124 }
3e75a3c4 125 if (PL_tainting && PL_tainted && !SvTAINTED(right))
a0d0e21e 126 TAINT_NOT;
e26df76a 127 if (PL_op->op_private & OPpASSIGN_CV_TO_GV) {
3e75a3c4 128 SV * const cv = SvRV(right);
e26df76a 129 const U32 cv_type = SvTYPE(cv);
3e75a3c4 130 const bool is_gv = isGV_with_GP(left);
6136c704 131 const bool got_coderef = cv_type == SVt_PVCV || cv_type == SVt_PVFM;
e26df76a
NC
132
133 if (!got_coderef) {
134 assert(SvROK(cv));
135 }
136
3e75a3c4
RU
137 /* Can do the optimisation if left (LVALUE) is not a typeglob,
138 right (RVALUE) is a reference to something, and we're in void
e26df76a 139 context. */
13be902c 140 if (!got_coderef && !is_gv && GIMME_V == G_VOID) {
e26df76a 141 /* Is the target symbol table currently empty? */
3e75a3c4 142 GV * const gv = gv_fetchsv_nomg(left, GV_NOINIT, SVt_PVGV);
bb112e5a 143 if (SvTYPE(gv) != SVt_PVGV && !SvOK(gv)) {
e26df76a
NC
144 /* Good. Create a new proxy constant subroutine in the target.
145 The gv becomes a(nother) reference to the constant. */
146 SV *const value = SvRV(cv);
147
ad64d0ec 148 SvUPGRADE(MUTABLE_SV(gv), SVt_IV);
1ccdb730 149 SvPCS_IMPORTED_on(gv);
e26df76a 150 SvRV_set(gv, value);
b37c2d43 151 SvREFCNT_inc_simple_void(value);
3e75a3c4 152 SETs(left);
e26df76a
NC
153 RETURN;
154 }
155 }
156
157 /* Need to fix things up. */
13be902c 158 if (!is_gv) {
e26df76a 159 /* Need to fix GV. */
3e75a3c4 160 left = MUTABLE_SV(gv_fetchsv_nomg(left,GV_ADD, SVt_PVGV));
e26df76a
NC
161 }
162
163 if (!got_coderef) {
164 /* We've been returned a constant rather than a full subroutine,
165 but they expect a subroutine reference to apply. */
53a42478 166 if (SvROK(cv)) {
d343c3ef 167 ENTER_with_name("sassign_coderef");
53a42478
NC
168 SvREFCNT_inc_void(SvRV(cv));
169 /* newCONSTSUB takes a reference count on the passed in SV
170 from us. We set the name to NULL, otherwise we get into
171 all sorts of fun as the reference to our new sub is
172 donated to the GV that we're about to assign to.
173 */
3e75a3c4 174 SvRV_set(right, MUTABLE_SV(newCONSTSUB(GvSTASH(left), NULL,
ad64d0ec 175 SvRV(cv))));
53a42478 176 SvREFCNT_dec(cv);
d343c3ef 177 LEAVE_with_name("sassign_coderef");
53a42478
NC
178 } else {
179 /* What can happen for the corner case *{"BONK"} = \&{"BONK"};
180 is that
181 First: ops for \&{"BONK"}; return us the constant in the
182 symbol table
183 Second: ops for *{"BONK"} cause that symbol table entry
184 (and our reference to it) to be upgraded from RV
185 to typeblob)
186 Thirdly: We get here. cv is actually PVGV now, and its
187 GvCV() is actually the subroutine we're looking for
188
189 So change the reference so that it points to the subroutine
190 of that typeglob, as that's what they were after all along.
191 */
159b6efe 192 GV *const upgraded = MUTABLE_GV(cv);
53a42478
NC
193 CV *const source = GvCV(upgraded);
194
195 assert(source);
196 assert(CvFLAGS(source) & CVf_CONST);
197
198 SvREFCNT_inc_void(source);
199 SvREFCNT_dec(upgraded);
3e75a3c4 200 SvRV_set(right, MUTABLE_SV(source));
53a42478 201 }
e26df76a 202 }
53a42478 203
e26df76a 204 }
8fe85e3f 205 if (
3e75a3c4
RU
206 SvTEMP(left) && !SvSMAGICAL(left) && SvREFCNT(left) == 1 &&
207 (!isGV_with_GP(left) || SvFAKE(left)) && ckWARN(WARN_MISC)
8fe85e3f
FC
208 )
209 Perl_warner(aTHX_
210 packWARN(WARN_MISC), "Useless assignment to a temporary"
211 );
3e75a3c4
RU
212 SvSetMagicSV(left, right);
213 SETs(left);
a0d0e21e
LW
214 RETURN;
215}
216
217PP(pp_cond_expr)
218{
97aff369 219 dVAR; dSP;
f410a211 220 PERL_ASYNC_CHECK();
a0d0e21e 221 if (SvTRUEx(POPs))
1a67a97c 222 RETURNOP(cLOGOP->op_other);
a0d0e21e 223 else
1a67a97c 224 RETURNOP(cLOGOP->op_next);
a0d0e21e
LW
225}
226
227PP(pp_unstack)
228{
97aff369 229 dVAR;
8f3964af 230 PERL_ASYNC_CHECK();
a0d0e21e 231 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 232 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e 233 FREETMPS;
eae48c89
Z
234 if (!(PL_op->op_flags & OPf_SPECIAL)) {
235 I32 oldsave = PL_scopestack[PL_scopestack_ix - 1];
236 LEAVE_SCOPE(oldsave);
237 }
a0d0e21e
LW
238 return NORMAL;
239}
240
a0d0e21e
LW
241PP(pp_concat)
242{
6f1401dc 243 dVAR; dSP; dATARGET; tryAMAGICbin_MG(concat_amg, AMGf_assign);
748a9306
LW
244 {
245 dPOPTOPssrl;
8d6d96c1
HS
246 bool lbyte;
247 STRLEN rlen;
d4c19fe8 248 const char *rpv = NULL;
a6b599c7 249 bool rbyte = FALSE;
a9c4fd4e 250 bool rcopied = FALSE;
8d6d96c1 251
6f1401dc
DM
252 if (TARG == right && right != left) { /* $r = $l.$r */
253 rpv = SvPV_nomg_const(right, rlen);
c75ab21a 254 rbyte = !DO_UTF8(right);
59cd0e26 255 right = newSVpvn_flags(rpv, rlen, SVs_TEMP);
349d4f2f 256 rpv = SvPV_const(right, rlen); /* no point setting UTF-8 here */
db79b45b 257 rcopied = TRUE;
8d6d96c1 258 }
7889fe52 259
89734059 260 if (TARG != left) { /* not $l .= $r */
a9c4fd4e 261 STRLEN llen;
6f1401dc 262 const char* const lpv = SvPV_nomg_const(left, llen);
90f5826e 263 lbyte = !DO_UTF8(left);
8d6d96c1
HS
264 sv_setpvn(TARG, lpv, llen);
265 if (!lbyte)
266 SvUTF8_on(TARG);
267 else
268 SvUTF8_off(TARG);
269 }
89734059 270 else { /* $l .= $r */
c75ab21a 271 if (!SvOK(TARG)) {
89734059 272 if (left == right && ckWARN(WARN_UNINITIALIZED)) /* $l .= $l */
c75ab21a 273 report_uninit(right);
76f68e9b 274 sv_setpvs(left, "");
c75ab21a 275 }
c5aa2872
DM
276 lbyte = (SvROK(left) && SvTYPE(SvRV(left)) == SVt_REGEXP)
277 ? !DO_UTF8(SvRV(left)) : !DO_UTF8(left);
90f5826e
ST
278 if (IN_BYTES)
279 SvUTF8_off(TARG);
8d6d96c1 280 }
a12c0f56 281
c75ab21a 282 if (!rcopied) {
6f1401dc 283 if (left == right)
89734059 284 /* $r.$r: do magic twice: tied might return different 2nd time */
6f1401dc
DM
285 SvGETMAGIC(right);
286 rpv = SvPV_nomg_const(right, rlen);
c75ab21a
RH
287 rbyte = !DO_UTF8(right);
288 }
8d6d96c1 289 if (lbyte != rbyte) {
e3393f51
NT
290 /* sv_utf8_upgrade_nomg() may reallocate the stack */
291 PUTBACK;
8d6d96c1
HS
292 if (lbyte)
293 sv_utf8_upgrade_nomg(TARG);
294 else {
db79b45b 295 if (!rcopied)
59cd0e26 296 right = newSVpvn_flags(rpv, rlen, SVs_TEMP);
8d6d96c1 297 sv_utf8_upgrade_nomg(right);
6f1401dc 298 rpv = SvPV_nomg_const(right, rlen);
69b47968 299 }
e3393f51 300 SPAGAIN;
a0d0e21e 301 }
8d6d96c1 302 sv_catpvn_nomg(TARG, rpv, rlen);
43ebc500 303
a0d0e21e
LW
304 SETTARG;
305 RETURN;
748a9306 306 }
a0d0e21e
LW
307}
308
309PP(pp_padsv)
310{
97aff369 311 dVAR; dSP; dTARGET;
a0d0e21e 312 XPUSHs(TARG);
533c011a
NIS
313 if (PL_op->op_flags & OPf_MOD) {
314 if (PL_op->op_private & OPpLVAL_INTRO)
952306ac
RGS
315 if (!(PL_op->op_private & OPpPAD_STATE))
316 SAVECLEARSV(PAD_SVl(PL_op->op_targ));
a62b51b8 317 if (PL_op->op_private & OPpDEREF) {
8ec5e241 318 PUTBACK;
9026059d 319 TOPs = vivify_ref(TOPs, PL_op->op_private & OPpDEREF);
8ec5e241
NIS
320 SPAGAIN;
321 }
4633a7c4 322 }
a0d0e21e
LW
323 RETURN;
324}
325
326PP(pp_readline)
327{
97aff369 328 dVAR;
30901a8a
FC
329 dSP;
330 if (TOPs) {
331 SvGETMAGIC(TOPs);
67288365 332 tryAMAGICunTARGETlist(iter_amg, 0, 0);
30901a8a
FC
333 PL_last_in_gv = MUTABLE_GV(*PL_stack_sp--);
334 }
335 else PL_last_in_gv = PL_argvgv, PL_stack_sp--;
6e592b3a
BM
336 if (!isGV_with_GP(PL_last_in_gv)) {
337 if (SvROK(PL_last_in_gv) && isGV_with_GP(SvRV(PL_last_in_gv)))
159b6efe 338 PL_last_in_gv = MUTABLE_GV(SvRV(PL_last_in_gv));
8efb3254 339 else {
f5284f61 340 dSP;
ad64d0ec 341 XPUSHs(MUTABLE_SV(PL_last_in_gv));
f5284f61 342 PUTBACK;
897d3989 343 Perl_pp_rv2gv(aTHX);
159b6efe 344 PL_last_in_gv = MUTABLE_GV(*PL_stack_sp--);
f5284f61
IZ
345 }
346 }
a0d0e21e
LW
347 return do_readline();
348}
349
350PP(pp_eq)
351{
6f1401dc 352 dVAR; dSP;
33efebe6
DM
353 SV *left, *right;
354
a42d0242 355 tryAMAGICbin_MG(eq_amg, AMGf_set|AMGf_numeric);
33efebe6
DM
356 right = POPs;
357 left = TOPs;
358 SETs(boolSV(
359 (SvIOK_notUV(left) && SvIOK_notUV(right))
360 ? (SvIVX(left) == SvIVX(right))
361 : ( do_ncmp(left, right) == 0)
362 ));
363 RETURN;
a0d0e21e
LW
364}
365
366PP(pp_preinc)
367{
97aff369 368 dVAR; dSP;
17058fe0
FC
369 const bool inc =
370 PL_op->op_type == OP_PREINC || PL_op->op_type == OP_I_PREINC;
60092ce4 371 if (SvTYPE(TOPs) >= SVt_PVAV || (isGV_with_GP(TOPs) && !SvFAKE(TOPs)))
6ad8f254 372 Perl_croak_no_modify(aTHX);
4bac9ae4 373 if (!SvREADONLY(TOPs) && !SvGMAGICAL(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
17058fe0 374 && SvIVX(TOPs) != (inc ? IV_MAX : IV_MIN))
55497cff 375 {
17058fe0 376 SvIV_set(TOPs, SvIVX(TOPs) + (inc ? 1 : -1));
55497cff 377 SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
748a9306 378 }
28e5dec8 379 else /* Do all the PERL_PRESERVE_IVUV conditionals in sv_inc */
17058fe0
FC
380 if (inc) sv_inc(TOPs);
381 else sv_dec(TOPs);
a0d0e21e
LW
382 SvSETMAGIC(TOPs);
383 return NORMAL;
384}
385
386PP(pp_or)
387{
97aff369 388 dVAR; dSP;
f410a211 389 PERL_ASYNC_CHECK();
a0d0e21e
LW
390 if (SvTRUE(TOPs))
391 RETURN;
392 else {
c960fc3b
SP
393 if (PL_op->op_type == OP_OR)
394 --SP;
a0d0e21e
LW
395 RETURNOP(cLOGOP->op_other);
396 }
397}
398
25a55bd7 399PP(pp_defined)
c963b151 400{
97aff369 401 dVAR; dSP;
eb578fdb 402 SV* sv;
6136c704 403 bool defined;
25a55bd7 404 const int op_type = PL_op->op_type;
ea5195b7 405 const bool is_dor = (op_type == OP_DOR || op_type == OP_DORASSIGN);
c963b151 406
6136c704 407 if (is_dor) {
f410a211 408 PERL_ASYNC_CHECK();
25a55bd7
SP
409 sv = TOPs;
410 if (!sv || !SvANY(sv)) {
2bd49cfc
NC
411 if (op_type == OP_DOR)
412 --SP;
25a55bd7
SP
413 RETURNOP(cLOGOP->op_other);
414 }
b7c44293
RGS
415 }
416 else {
417 /* OP_DEFINED */
25a55bd7
SP
418 sv = POPs;
419 if (!sv || !SvANY(sv))
420 RETPUSHNO;
b7c44293 421 }
25a55bd7 422
6136c704 423 defined = FALSE;
c963b151
BD
424 switch (SvTYPE(sv)) {
425 case SVt_PVAV:
426 if (AvMAX(sv) >= 0 || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 427 defined = TRUE;
c963b151
BD
428 break;
429 case SVt_PVHV:
430 if (HvARRAY(sv) || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 431 defined = TRUE;
c963b151
BD
432 break;
433 case SVt_PVCV:
434 if (CvROOT(sv) || CvXSUB(sv))
25a55bd7 435 defined = TRUE;
c963b151
BD
436 break;
437 default:
5b295bef 438 SvGETMAGIC(sv);
c963b151 439 if (SvOK(sv))
25a55bd7 440 defined = TRUE;
6136c704 441 break;
c963b151 442 }
6136c704
AL
443
444 if (is_dor) {
c960fc3b
SP
445 if(defined)
446 RETURN;
447 if(op_type == OP_DOR)
448 --SP;
25a55bd7 449 RETURNOP(cLOGOP->op_other);
25a55bd7 450 }
d9aa96a4
SP
451 /* assuming OP_DEFINED */
452 if(defined)
453 RETPUSHYES;
454 RETPUSHNO;
c963b151
BD
455}
456
a0d0e21e
LW
457PP(pp_add)
458{
800401ee 459 dVAR; dSP; dATARGET; bool useleft; SV *svl, *svr;
6f1401dc
DM
460 tryAMAGICbin_MG(add_amg, AMGf_assign|AMGf_numeric);
461 svr = TOPs;
462 svl = TOPm1s;
463
800401ee 464 useleft = USE_LEFT(svl);
28e5dec8
JH
465#ifdef PERL_PRESERVE_IVUV
466 /* We must see if we can perform the addition with integers if possible,
467 as the integer code detects overflow while the NV code doesn't.
468 If either argument hasn't had a numeric conversion yet attempt to get
469 the IV. It's important to do this now, rather than just assuming that
470 it's not IOK as a PV of "9223372036854775806" may not take well to NV
471 addition, and an SV which is NOK, NV=6.0 ought to be coerced to
472 integer in case the second argument is IV=9223372036854775806
473 We can (now) rely on sv_2iv to do the right thing, only setting the
474 public IOK flag if the value in the NV (or PV) slot is truly integer.
475
476 A side effect is that this also aggressively prefers integer maths over
7dca457a
NC
477 fp maths for integer values.
478
a00b5bd3 479 How to detect overflow?
7dca457a
NC
480
481 C 99 section 6.2.6.1 says
482
483 The range of nonnegative values of a signed integer type is a subrange
484 of the corresponding unsigned integer type, and the representation of
485 the same value in each type is the same. A computation involving
486 unsigned operands can never overflow, because a result that cannot be
487 represented by the resulting unsigned integer type is reduced modulo
488 the number that is one greater than the largest value that can be
489 represented by the resulting type.
490
491 (the 9th paragraph)
492
493 which I read as "unsigned ints wrap."
494
495 signed integer overflow seems to be classed as "exception condition"
496
497 If an exceptional condition occurs during the evaluation of an
498 expression (that is, if the result is not mathematically defined or not
499 in the range of representable values for its type), the behavior is
500 undefined.
501
502 (6.5, the 5th paragraph)
503
504 I had assumed that on 2s complement machines signed arithmetic would
505 wrap, hence coded pp_add and pp_subtract on the assumption that
506 everything perl builds on would be happy. After much wailing and
507 gnashing of teeth it would seem that irix64 knows its ANSI spec well,
508 knows that it doesn't need to, and doesn't. Bah. Anyway, the all-
509 unsigned code below is actually shorter than the old code. :-)
510 */
511
01f91bf2 512 if (SvIV_please_nomg(svr)) {
28e5dec8
JH
513 /* Unless the left argument is integer in range we are going to have to
514 use NV maths. Hence only attempt to coerce the right argument if
515 we know the left is integer. */
eb578fdb 516 UV auv = 0;
9c5ffd7c 517 bool auvok = FALSE;
7dca457a
NC
518 bool a_valid = 0;
519
28e5dec8 520 if (!useleft) {
7dca457a
NC
521 auv = 0;
522 a_valid = auvok = 1;
523 /* left operand is undef, treat as zero. + 0 is identity,
524 Could SETi or SETu right now, but space optimise by not adding
525 lots of code to speed up what is probably a rarish case. */
526 } else {
527 /* Left operand is defined, so is it IV? */
01f91bf2 528 if (SvIV_please_nomg(svl)) {
800401ee
JH
529 if ((auvok = SvUOK(svl)))
530 auv = SvUVX(svl);
7dca457a 531 else {
eb578fdb 532 const IV aiv = SvIVX(svl);
7dca457a
NC
533 if (aiv >= 0) {
534 auv = aiv;
535 auvok = 1; /* Now acting as a sign flag. */
536 } else { /* 2s complement assumption for IV_MIN */
537 auv = (UV)-aiv;
538 }
539 }
540 a_valid = 1;
28e5dec8
JH
541 }
542 }
7dca457a
NC
543 if (a_valid) {
544 bool result_good = 0;
545 UV result;
eb578fdb 546 UV buv;
800401ee 547 bool buvok = SvUOK(svr);
a00b5bd3 548
7dca457a 549 if (buvok)
800401ee 550 buv = SvUVX(svr);
7dca457a 551 else {
eb578fdb 552 const IV biv = SvIVX(svr);
7dca457a
NC
553 if (biv >= 0) {
554 buv = biv;
555 buvok = 1;
556 } else
557 buv = (UV)-biv;
558 }
559 /* ?uvok if value is >= 0. basically, flagged as UV if it's +ve,
602f51c4 560 else "IV" now, independent of how it came in.
7dca457a
NC
561 if a, b represents positive, A, B negative, a maps to -A etc
562 a + b => (a + b)
563 A + b => -(a - b)
564 a + B => (a - b)
565 A + B => -(a + b)
566 all UV maths. negate result if A negative.
567 add if signs same, subtract if signs differ. */
568
569 if (auvok ^ buvok) {
570 /* Signs differ. */
571 if (auv >= buv) {
572 result = auv - buv;
573 /* Must get smaller */
574 if (result <= auv)
575 result_good = 1;
576 } else {
577 result = buv - auv;
578 if (result <= buv) {
579 /* result really should be -(auv-buv). as its negation
580 of true value, need to swap our result flag */
581 auvok = !auvok;
582 result_good = 1;
28e5dec8
JH
583 }
584 }
7dca457a
NC
585 } else {
586 /* Signs same */
587 result = auv + buv;
588 if (result >= auv)
589 result_good = 1;
590 }
591 if (result_good) {
592 SP--;
593 if (auvok)
28e5dec8 594 SETu( result );
7dca457a
NC
595 else {
596 /* Negate result */
597 if (result <= (UV)IV_MIN)
598 SETi( -(IV)result );
599 else {
600 /* result valid, but out of range for IV. */
601 SETn( -(NV)result );
28e5dec8
JH
602 }
603 }
7dca457a
NC
604 RETURN;
605 } /* Overflow, drop through to NVs. */
28e5dec8
JH
606 }
607 }
608#endif
a0d0e21e 609 {
6f1401dc 610 NV value = SvNV_nomg(svr);
4efa5a16 611 (void)POPs;
28e5dec8
JH
612 if (!useleft) {
613 /* left operand is undef, treat as zero. + 0.0 is identity. */
614 SETn(value);
615 RETURN;
616 }
6f1401dc 617 SETn( value + SvNV_nomg(svl) );
28e5dec8 618 RETURN;
a0d0e21e
LW
619 }
620}
621
622PP(pp_aelemfast)
623{
97aff369 624 dVAR; dSP;
93bad3fd 625 AV * const av = PL_op->op_type == OP_AELEMFAST_LEX
8f878375 626 ? MUTABLE_AV(PAD_SV(PL_op->op_targ)) : GvAVn(cGVOP_gv);
a3b680e6 627 const U32 lval = PL_op->op_flags & OPf_MOD;
0bd48802 628 SV** const svp = av_fetch(av, PL_op->op_private, lval);
3280af22 629 SV *sv = (svp ? *svp : &PL_sv_undef);
6ff81951 630 EXTEND(SP, 1);
39cf747a 631 if (!lval && SvRMAGICAL(av) && SvGMAGICAL(sv)) /* see note in pp_helem() */
fd69380d 632 mg_get(sv);
be6c24e0 633 PUSHs(sv);
a0d0e21e
LW
634 RETURN;
635}
636
637PP(pp_join)
638{
97aff369 639 dVAR; dSP; dMARK; dTARGET;
a0d0e21e
LW
640 MARK++;
641 do_join(TARG, *MARK, MARK, SP);
642 SP = MARK;
643 SETs(TARG);
644 RETURN;
645}
646
647PP(pp_pushre)
648{
97aff369 649 dVAR; dSP;
44a8e56a
PP
650#ifdef DEBUGGING
651 /*
652 * We ass_u_me that LvTARGOFF() comes first, and that two STRLENs
653 * will be enough to hold an OP*.
654 */
c4420975 655 SV* const sv = sv_newmortal();
44a8e56a
PP
656 sv_upgrade(sv, SVt_PVLV);
657 LvTYPE(sv) = '/';
533c011a 658 Copy(&PL_op, &LvTARGOFF(sv), 1, OP*);
44a8e56a
PP
659 XPUSHs(sv);
660#else
ad64d0ec 661 XPUSHs(MUTABLE_SV(PL_op));
44a8e56a 662#endif
a0d0e21e
LW
663 RETURN;
664}
665
666/* Oversized hot code. */
667
668PP(pp_print)
669{
27da23d5 670 dVAR; dSP; dMARK; dORIGMARK;
eb578fdb 671 PerlIO *fp;
236988e4 672 MAGIC *mg;
159b6efe
NC
673 GV * const gv
674 = (PL_op->op_flags & OPf_STACKED) ? MUTABLE_GV(*++MARK) : PL_defoutgv;
9c9f25b8 675 IO *io = GvIO(gv);
5b468f54 676
9c9f25b8 677 if (io
ad64d0ec 678 && (mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar)))
5b468f54 679 {
01bb7c6d 680 had_magic:
68dc0745 681 if (MARK == ORIGMARK) {
1c846c1f 682 /* If using default handle then we need to make space to
a60c0954
NIS
683 * pass object as 1st arg, so move other args up ...
684 */
4352c267 685 MEXTEND(SP, 1);
68dc0745
PP
686 ++MARK;
687 Move(MARK, MARK + 1, (SP - MARK) + 1, SV*);
688 ++SP;
689 }
94bc412f
NC
690 return Perl_tied_method(aTHX_ "PRINT", mark - 1, MUTABLE_SV(io),
691 mg,
692 (G_SCALAR | TIED_METHOD_ARGUMENTS_ON_STACK
693 | (PL_op->op_type == OP_SAY
694 ? TIED_METHOD_SAY : 0)), sp - mark);
236988e4 695 }
9c9f25b8 696 if (!io) {
68b590d9 697 if ( gv && GvEGVx(gv) && (io = GvIO(GvEGV(gv)))
ad64d0ec 698 && (mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar)))
01bb7c6d 699 goto had_magic;
51087808 700 report_evil_fh(gv);
93189314 701 SETERRNO(EBADF,RMS_IFI);
a0d0e21e
LW
702 goto just_say_no;
703 }
704 else if (!(fp = IoOFP(io))) {
7716c5c5
NC
705 if (IoIFP(io))
706 report_wrongway_fh(gv, '<');
51087808 707 else
7716c5c5 708 report_evil_fh(gv);
93189314 709 SETERRNO(EBADF,IoIFP(io)?RMS_FAC:RMS_IFI);
a0d0e21e
LW
710 goto just_say_no;
711 }
712 else {
e23d9e2f 713 SV * const ofs = GvSV(PL_ofsgv); /* $, */
a0d0e21e 714 MARK++;
e23d9e2f 715 if (ofs && (SvGMAGICAL(ofs) || SvOK(ofs))) {
a0d0e21e
LW
716 while (MARK <= SP) {
717 if (!do_print(*MARK, fp))
718 break;
719 MARK++;
720 if (MARK <= SP) {
e23d9e2f
CS
721 /* don't use 'ofs' here - it may be invalidated by magic callbacks */
722 if (!do_print(GvSV(PL_ofsgv), fp)) {
a0d0e21e
LW
723 MARK--;
724 break;
725 }
726 }
727 }
728 }
729 else {
730 while (MARK <= SP) {
731 if (!do_print(*MARK, fp))
732 break;
733 MARK++;
734 }
735 }
736 if (MARK <= SP)
737 goto just_say_no;
738 else {
cfc4a7da
GA
739 if (PL_op->op_type == OP_SAY) {
740 if (PerlIO_write(fp, "\n", 1) == 0 || PerlIO_error(fp))
741 goto just_say_no;
742 }
743 else if (PL_ors_sv && SvOK(PL_ors_sv))
7889fe52 744 if (!do_print(PL_ors_sv, fp)) /* $\ */
a0d0e21e
LW
745 goto just_say_no;
746
747 if (IoFLAGS(io) & IOf_FLUSH)
760ac839 748 if (PerlIO_flush(fp) == EOF)
a0d0e21e
LW
749 goto just_say_no;
750 }
751 }
752 SP = ORIGMARK;
e52fd6f4 753 XPUSHs(&PL_sv_yes);
a0d0e21e
LW
754 RETURN;
755
756 just_say_no:
757 SP = ORIGMARK;
e52fd6f4 758 XPUSHs(&PL_sv_undef);
a0d0e21e
LW
759 RETURN;
760}
761
762PP(pp_rv2av)
763{
97aff369 764 dVAR; dSP; dTOPss;
cde874ca 765 const I32 gimme = GIMME_V;
17ab7946
NC
766 static const char an_array[] = "an ARRAY";
767 static const char a_hash[] = "a HASH";
768 const bool is_pp_rv2av = PL_op->op_type == OP_RV2AV;
d83b45b8 769 const svtype type = is_pp_rv2av ? SVt_PVAV : SVt_PVHV;
a0d0e21e 770
9026059d 771 SvGETMAGIC(sv);
a0d0e21e 772 if (SvROK(sv)) {
93d7320b
DM
773 if (SvAMAGIC(sv)) {
774 sv = amagic_deref_call(sv, is_pp_rv2av ? to_av_amg : to_hv_amg);
93d7320b 775 }
17ab7946
NC
776 sv = SvRV(sv);
777 if (SvTYPE(sv) != type)
dcbac5bb 778 /* diag_listed_as: Not an ARRAY reference */
17ab7946 779 DIE(aTHX_ "Not %s reference", is_pp_rv2av ? an_array : a_hash);
3da99855
FC
780 else if (PL_op->op_flags & OPf_MOD
781 && PL_op->op_private & OPpLVAL_INTRO)
782 Perl_croak(aTHX_ "%s", PL_no_localize_ref);
a0d0e21e 783 }
9f527363 784 else if (SvTYPE(sv) != type) {
67955e0c 785 GV *gv;
1c846c1f 786
6e592b3a 787 if (!isGV_with_GP(sv)) {
dc3c76f8
NC
788 gv = Perl_softref2xv(aTHX_ sv, is_pp_rv2av ? an_array : a_hash,
789 type, &sp);
790 if (!gv)
791 RETURN;
35cd451c
GS
792 }
793 else {
159b6efe 794 gv = MUTABLE_GV(sv);
a0d0e21e 795 }
ad64d0ec 796 sv = is_pp_rv2av ? MUTABLE_SV(GvAVn(gv)) : MUTABLE_SV(GvHVn(gv));
533c011a 797 if (PL_op->op_private & OPpLVAL_INTRO)
ad64d0ec 798 sv = is_pp_rv2av ? MUTABLE_SV(save_ary(gv)) : MUTABLE_SV(save_hash(gv));
9f527363
FC
799 }
800 if (PL_op->op_flags & OPf_REF) {
17ab7946 801 SETs(sv);
a0d0e21e 802 RETURN;
9f527363
FC
803 }
804 else if (PL_op->op_private & OPpMAYBE_LVSUB) {
40c94d11
FC
805 const I32 flags = is_lvalue_sub();
806 if (flags && !(flags & OPpENTERSUB_INARGS)) {
cde874ca 807 if (gimme != G_ARRAY)
042560a6 808 goto croak_cant_return;
17ab7946 809 SETs(sv);
78f9721b 810 RETURN;
40c94d11 811 }
a0d0e21e
LW
812 }
813
17ab7946 814 if (is_pp_rv2av) {
502c6561 815 AV *const av = MUTABLE_AV(sv);
486ec47a 816 /* The guts of pp_rv2av, with no intending change to preserve history
17ab7946
NC
817 (until such time as we get tools that can do blame annotation across
818 whitespace changes. */
96913b52
VP
819 if (gimme == G_ARRAY) {
820 const I32 maxarg = AvFILL(av) + 1;
821 (void)POPs; /* XXXX May be optimized away? */
822 EXTEND(SP, maxarg);
823 if (SvRMAGICAL(av)) {
824 U32 i;
825 for (i=0; i < (U32)maxarg; i++) {
826 SV ** const svp = av_fetch(av, i, FALSE);
827 /* See note in pp_helem, and bug id #27839 */
828 SP[i+1] = svp
829 ? SvGMAGICAL(*svp) ? (mg_get(*svp), *svp) : *svp
830 : &PL_sv_undef;
831 }
832 }
833 else {
834 Copy(AvARRAY(av), SP+1, maxarg, SV*);
93965878 835 }
96913b52 836 SP += maxarg;
1c846c1f 837 }
96913b52
VP
838 else if (gimme == G_SCALAR) {
839 dTARGET;
840 const I32 maxarg = AvFILL(av) + 1;
841 SETi(maxarg);
93965878 842 }
17ab7946
NC
843 } else {
844 /* The guts of pp_rv2hv */
96913b52
VP
845 if (gimme == G_ARRAY) { /* array wanted */
846 *PL_stack_sp = sv;
981b7185 847 return Perl_do_kv(aTHX);
96913b52 848 }
c8fe3bdf 849 else if ((PL_op->op_private & OPpTRUEBOOL
adc42c31 850 || ( PL_op->op_private & OPpMAYBE_TRUEBOOL
c8fe3bdf
FC
851 && block_gimme() == G_VOID ))
852 && (!SvRMAGICAL(sv) || !mg_find(sv, PERL_MAGIC_tied)))
853 SETs(HvUSEDKEYS(sv) ? &PL_sv_yes : sv_2mortal(newSViv(0)));
96913b52
VP
854 else if (gimme == G_SCALAR) {
855 dTARGET;
856 TARG = Perl_hv_scalar(aTHX_ MUTABLE_HV(sv));
857 SPAGAIN;
858 SETTARG;
859 }
17ab7946 860 }
be85d344 861 RETURN;
042560a6
NC
862
863 croak_cant_return:
864 Perl_croak(aTHX_ "Can't return %s to lvalue scalar context",
865 is_pp_rv2av ? "array" : "hash");
77e217c6 866 RETURN;
a0d0e21e
LW
867}
868
10c8fecd
GS
869STATIC void
870S_do_oddball(pTHX_ HV *hash, SV **relem, SV **firstrelem)
871{
97aff369 872 dVAR;
7918f24d
NC
873
874 PERL_ARGS_ASSERT_DO_ODDBALL;
875
10c8fecd
GS
876 if (*relem) {
877 SV *tmpstr;
b464bac0 878 const HE *didstore;
6d822dc4
MS
879
880 if (ckWARN(WARN_MISC)) {
a3b680e6 881 const char *err;
10c8fecd
GS
882 if (relem == firstrelem &&
883 SvROK(*relem) &&
884 (SvTYPE(SvRV(*relem)) == SVt_PVAV ||
885 SvTYPE(SvRV(*relem)) == SVt_PVHV))
886 {
a3b680e6 887 err = "Reference found where even-sized list expected";
10c8fecd
GS
888 }
889 else
a3b680e6 890 err = "Odd number of elements in hash assignment";
f1f66076 891 Perl_warner(aTHX_ packWARN(WARN_MISC), "%s", err);
10c8fecd 892 }
6d822dc4 893
561b68a9 894 tmpstr = newSV(0);
6d822dc4
MS
895 didstore = hv_store_ent(hash,*relem,tmpstr,0);
896 if (SvMAGICAL(hash)) {
897 if (SvSMAGICAL(tmpstr))
898 mg_set(tmpstr);
899 if (!didstore)
900 sv_2mortal(tmpstr);
901 }
902 TAINT_NOT;
10c8fecd
GS
903 }
904}
905
a0d0e21e
LW
906PP(pp_aassign)
907{
27da23d5 908 dVAR; dSP;
3280af22
NIS
909 SV **lastlelem = PL_stack_sp;
910 SV **lastrelem = PL_stack_base + POPMARK;
911 SV **firstrelem = PL_stack_base + POPMARK + 1;
a0d0e21e
LW
912 SV **firstlelem = lastrelem + 1;
913
eb578fdb
KW
914 SV **relem;
915 SV **lelem;
a0d0e21e 916
eb578fdb
KW
917 SV *sv;
918 AV *ary;
a0d0e21e 919
54310121 920 I32 gimme;
a0d0e21e
LW
921 HV *hash;
922 I32 i;
923 int magic;
ca65944e 924 int duplicates = 0;
cbbf8932 925 SV **firsthashrelem = NULL; /* "= 0" keeps gcc 2.95 quiet */
5637b936 926
3280af22 927 PL_delaymagic = DM_DELAY; /* catch simultaneous items */
ca65944e 928 gimme = GIMME_V;
a0d0e21e
LW
929
930 /* If there's a common identifier on both sides we have to take
931 * special care that assigning the identifier on the left doesn't
932 * clobber a value on the right that's used later in the list.
acdea6f0 933 * Don't bother if LHS is just an empty hash or array.
a0d0e21e 934 */
acdea6f0
DM
935
936 if ( (PL_op->op_private & OPpASSIGN_COMMON)
937 && (
938 firstlelem != lastlelem
939 || ! ((sv = *firstlelem))
940 || SvMAGICAL(sv)
941 || ! (SvTYPE(sv) == SVt_PVAV || SvTYPE(sv) == SVt_PVHV)
942 || (SvTYPE(sv) == SVt_PVAV && AvFILL((AV*)sv) != -1)
1b95d04f 943 || (SvTYPE(sv) == SVt_PVHV && HvUSEDKEYS((HV*)sv) != 0)
acdea6f0
DM
944 )
945 ) {
cc5e57d2 946 EXTEND_MORTAL(lastrelem - firstrelem + 1);
10c8fecd 947 for (relem = firstrelem; relem <= lastrelem; relem++) {
155aba94 948 if ((sv = *relem)) {
a1f49e72 949 TAINT_NOT; /* Each item is independent */
61e5f455
NC
950
951 /* Dear TODO test in t/op/sort.t, I love you.
952 (It's relying on a panic, not a "semi-panic" from newSVsv()
953 and then an assertion failure below.) */
954 if (SvIS_FREED(sv)) {
955 Perl_croak(aTHX_ "panic: attempt to copy freed scalar %p",
956 (void*)sv);
957 }
958 /* Specifically *not* sv_mortalcopy(), as that will steal TEMPs,
959 and we need a second copy of a temp here. */
960 *relem = sv_2mortal(newSVsv(sv));
a1f49e72 961 }
10c8fecd 962 }
a0d0e21e
LW
963 }
964
965 relem = firstrelem;
966 lelem = firstlelem;
4608196e
RGS
967 ary = NULL;
968 hash = NULL;
10c8fecd 969
a0d0e21e 970 while (lelem <= lastlelem) {
bbce6d69 971 TAINT_NOT; /* Each item stands on its own, taintwise. */
a0d0e21e
LW
972 sv = *lelem++;
973 switch (SvTYPE(sv)) {
974 case SVt_PVAV:
60edcf09 975 ary = MUTABLE_AV(sv);
748a9306 976 magic = SvMAGICAL(ary) != 0;
60edcf09
FC
977 ENTER;
978 SAVEFREESV(SvREFCNT_inc_simple_NN(sv));
a0d0e21e 979 av_clear(ary);
7e42bd57 980 av_extend(ary, lastrelem - relem);
a0d0e21e
LW
981 i = 0;
982 while (relem <= lastrelem) { /* gobble up all the rest */
5117ca91 983 SV **didstore;
a0d0e21e 984 assert(*relem);
4f0556e9
NC
985 sv = newSV(0);
986 sv_setsv(sv, *relem);
a0d0e21e 987 *(relem++) = sv;
5117ca91
GS
988 didstore = av_store(ary,i++,sv);
989 if (magic) {
8ef24240 990 if (SvSMAGICAL(sv))
fb73857a 991 mg_set(sv);
5117ca91 992 if (!didstore)
8127e0e3 993 sv_2mortal(sv);
5117ca91 994 }
bbce6d69 995 TAINT_NOT;
a0d0e21e 996 }
354b0578 997 if (PL_delaymagic & DM_ARRAY_ISA)
ad64d0ec 998 SvSETMAGIC(MUTABLE_SV(ary));
60edcf09 999 LEAVE;
a0d0e21e 1000 break;
10c8fecd 1001 case SVt_PVHV: { /* normal hash */
a0d0e21e 1002 SV *tmpstr;
45960564 1003 SV** topelem = relem;
a0d0e21e 1004
60edcf09 1005 hash = MUTABLE_HV(sv);
748a9306 1006 magic = SvMAGICAL(hash) != 0;
60edcf09
FC
1007 ENTER;
1008 SAVEFREESV(SvREFCNT_inc_simple_NN(sv));
a0d0e21e 1009 hv_clear(hash);
ca65944e 1010 firsthashrelem = relem;
a0d0e21e
LW
1011
1012 while (relem < lastrelem) { /* gobble up all the rest */
5117ca91 1013 HE *didstore;
6136c704
AL
1014 sv = *relem ? *relem : &PL_sv_no;
1015 relem++;
561b68a9 1016 tmpstr = newSV(0);
a0d0e21e
LW
1017 if (*relem)
1018 sv_setsv(tmpstr,*relem); /* value */
45960564
DM
1019 relem++;
1020 if (gimme != G_VOID) {
1021 if (hv_exists_ent(hash, sv, 0))
1022 /* key overwrites an existing entry */
1023 duplicates += 2;
1024 else
1025 if (gimme == G_ARRAY) {
1026 /* copy element back: possibly to an earlier
1027 * stack location if we encountered dups earlier */
1028 *topelem++ = sv;
1029 *topelem++ = tmpstr;
1030 }
1031 }
5117ca91
GS
1032 didstore = hv_store_ent(hash,sv,tmpstr,0);
1033 if (magic) {
8ef24240 1034 if (SvSMAGICAL(tmpstr))
fb73857a 1035 mg_set(tmpstr);
5117ca91 1036 if (!didstore)
8127e0e3 1037 sv_2mortal(tmpstr);
5117ca91 1038 }
bbce6d69 1039 TAINT_NOT;
8e07c86e 1040 }
6a0deba8 1041 if (relem == lastrelem) {
10c8fecd 1042 do_oddball(hash, relem, firstrelem);
6a0deba8 1043 relem++;
1930e939 1044 }
60edcf09 1045 LEAVE;
a0d0e21e
LW
1046 }
1047 break;
1048 default:
6fc92669
GS
1049 if (SvIMMORTAL(sv)) {
1050 if (relem <= lastrelem)
1051 relem++;
1052 break;
a0d0e21e
LW
1053 }
1054 if (relem <= lastrelem) {
1c70fb82
FC
1055 if (
1056 SvTEMP(sv) && !SvSMAGICAL(sv) && SvREFCNT(sv) == 1 &&
1057 (!isGV_with_GP(sv) || SvFAKE(sv)) && ckWARN(WARN_MISC)
1058 )
1059 Perl_warner(aTHX_
1060 packWARN(WARN_MISC),
1061 "Useless assignment to a temporary"
1062 );
a0d0e21e
LW
1063 sv_setsv(sv, *relem);
1064 *(relem++) = sv;
1065 }
1066 else
3280af22 1067 sv_setsv(sv, &PL_sv_undef);
8ef24240 1068 SvSETMAGIC(sv);
a0d0e21e
LW
1069 break;
1070 }
1071 }
3280af22 1072 if (PL_delaymagic & ~DM_DELAY) {
985213f2
AB
1073 /* Will be used to set PL_tainting below */
1074 UV tmp_uid = PerlProc_getuid();
1075 UV tmp_euid = PerlProc_geteuid();
1076 UV tmp_gid = PerlProc_getgid();
1077 UV tmp_egid = PerlProc_getegid();
1078
3280af22 1079 if (PL_delaymagic & DM_UID) {
a0d0e21e 1080#ifdef HAS_SETRESUID
985213f2
AB
1081 (void)setresuid((PL_delaymagic & DM_RUID) ? PL_delaymagic_uid : (Uid_t)-1,
1082 (PL_delaymagic & DM_EUID) ? PL_delaymagic_euid : (Uid_t)-1,
fb934a90 1083 (Uid_t)-1);
56febc5e
AD
1084#else
1085# ifdef HAS_SETREUID
985213f2
AB
1086 (void)setreuid((PL_delaymagic & DM_RUID) ? PL_delaymagic_uid : (Uid_t)-1,
1087 (PL_delaymagic & DM_EUID) ? PL_delaymagic_euid : (Uid_t)-1);
56febc5e
AD
1088# else
1089# ifdef HAS_SETRUID
b28d0864 1090 if ((PL_delaymagic & DM_UID) == DM_RUID) {
985213f2 1091 (void)setruid(PL_delaymagic_uid);
b28d0864 1092 PL_delaymagic &= ~DM_RUID;
a0d0e21e 1093 }
56febc5e
AD
1094# endif /* HAS_SETRUID */
1095# ifdef HAS_SETEUID
b28d0864 1096 if ((PL_delaymagic & DM_UID) == DM_EUID) {
985213f2 1097 (void)seteuid(PL_delaymagic_euid);
b28d0864 1098 PL_delaymagic &= ~DM_EUID;
a0d0e21e 1099 }
56febc5e 1100# endif /* HAS_SETEUID */
b28d0864 1101 if (PL_delaymagic & DM_UID) {
985213f2 1102 if (PL_delaymagic_uid != PL_delaymagic_euid)
cea2e8a9 1103 DIE(aTHX_ "No setreuid available");
985213f2 1104 (void)PerlProc_setuid(PL_delaymagic_uid);
a0d0e21e 1105 }
56febc5e
AD
1106# endif /* HAS_SETREUID */
1107#endif /* HAS_SETRESUID */
985213f2
AB
1108 tmp_uid = PerlProc_getuid();
1109 tmp_euid = PerlProc_geteuid();
a0d0e21e 1110 }
3280af22 1111 if (PL_delaymagic & DM_GID) {
a0d0e21e 1112#ifdef HAS_SETRESGID
985213f2
AB
1113 (void)setresgid((PL_delaymagic & DM_RGID) ? PL_delaymagic_gid : (Gid_t)-1,
1114 (PL_delaymagic & DM_EGID) ? PL_delaymagic_egid : (Gid_t)-1,
fb934a90 1115 (Gid_t)-1);
56febc5e
AD
1116#else
1117# ifdef HAS_SETREGID
985213f2
AB
1118 (void)setregid((PL_delaymagic & DM_RGID) ? PL_delaymagic_gid : (Gid_t)-1,
1119 (PL_delaymagic & DM_EGID) ? PL_delaymagic_egid : (Gid_t)-1);
56febc5e
AD
1120# else
1121# ifdef HAS_SETRGID
b28d0864 1122 if ((PL_delaymagic & DM_GID) == DM_RGID) {
985213f2 1123 (void)setrgid(PL_delaymagic_gid);
b28d0864 1124 PL_delaymagic &= ~DM_RGID;
a0d0e21e 1125 }
56febc5e
AD
1126# endif /* HAS_SETRGID */
1127# ifdef HAS_SETEGID
b28d0864 1128 if ((PL_delaymagic & DM_GID) == DM_EGID) {
985213f2 1129 (void)setegid(PL_delaymagic_egid);
b28d0864 1130 PL_delaymagic &= ~DM_EGID;
a0d0e21e 1131 }
56febc5e 1132# endif /* HAS_SETEGID */
b28d0864 1133 if (PL_delaymagic & DM_GID) {
985213f2 1134 if (PL_delaymagic_gid != PL_delaymagic_egid)
cea2e8a9 1135 DIE(aTHX_ "No setregid available");
985213f2 1136 (void)PerlProc_setgid(PL_delaymagic_gid);
a0d0e21e 1137 }
56febc5e
AD
1138# endif /* HAS_SETREGID */
1139#endif /* HAS_SETRESGID */
985213f2
AB
1140 tmp_gid = PerlProc_getgid();
1141 tmp_egid = PerlProc_getegid();
a0d0e21e 1142 }
985213f2 1143 PL_tainting |= (tmp_uid && (tmp_euid != tmp_uid || tmp_egid != tmp_gid));
a0d0e21e 1144 }
3280af22 1145 PL_delaymagic = 0;
54310121 1146
54310121
PP
1147 if (gimme == G_VOID)
1148 SP = firstrelem - 1;
1149 else if (gimme == G_SCALAR) {
1150 dTARGET;
1151 SP = firstrelem;
ca65944e 1152 SETi(lastrelem - firstrelem + 1 - duplicates);
54310121
PP
1153 }
1154 else {
ca65944e 1155 if (ary)
a0d0e21e 1156 SP = lastrelem;
ca65944e
RGS
1157 else if (hash) {
1158 if (duplicates) {
45960564
DM
1159 /* at this point we have removed the duplicate key/value
1160 * pairs from the stack, but the remaining values may be
1161 * wrong; i.e. with (a 1 a 2 b 3) on the stack we've removed
1162 * the (a 2), but the stack now probably contains
1163 * (a <freed> b 3), because { hv_save(a,1); hv_save(a,2) }
1164 * obliterates the earlier key. So refresh all values. */
ca65944e 1165 lastrelem -= duplicates;
45960564
DM
1166 relem = firsthashrelem;
1167 while (relem < lastrelem) {
1168 HE *he;
1169 sv = *relem++;
1170 he = hv_fetch_ent(hash, sv, 0, 0);
1171 *relem++ = (he ? HeVAL(he) : &PL_sv_undef);
1172 }
ca65944e
RGS
1173 }
1174 SP = lastrelem;
1175 }
a0d0e21e
LW
1176 else
1177 SP = firstrelem + (lastlelem - firstlelem);
0c8c7a05 1178 lelem = firstlelem + (relem - firstrelem);
5f05dabc 1179 while (relem <= SP)
3280af22 1180 *relem++ = (lelem <= lastlelem) ? *lelem++ : &PL_sv_undef;
a0d0e21e 1181 }
08aeb9f7 1182
54310121 1183 RETURN;
a0d0e21e
LW
1184}
1185
8782bef2
GB
1186PP(pp_qr)
1187{
97aff369 1188 dVAR; dSP;
eb578fdb 1189 PMOP * const pm = cPMOP;
fe578d7f 1190 REGEXP * rx = PM_GETRE(pm);
10599a69 1191 SV * const pkg = rx ? CALLREG_PACKAGE(rx) : NULL;
c4420975 1192 SV * const rv = sv_newmortal();
d63c20f2
DM
1193 CV **cvp;
1194 CV *cv;
288b8c02
NC
1195
1196 SvUPGRADE(rv, SVt_IV);
c2123ae3
NC
1197 /* For a subroutine describing itself as "This is a hacky workaround" I'm
1198 loathe to use it here, but it seems to be the right fix. Or close.
1199 The key part appears to be that it's essential for pp_qr to return a new
1200 object (SV), which implies that there needs to be an effective way to
1201 generate a new SV from the existing SV that is pre-compiled in the
1202 optree. */
1203 SvRV_set(rv, MUTABLE_SV(reg_temp_copy(NULL, rx)));
288b8c02
NC
1204 SvROK_on(rv);
1205
d63c20f2
DM
1206 cvp = &( ((struct regexp*)SvANY(SvRV(rv)))->qr_anoncv);
1207 if ((cv = *cvp) && CvCLONE(*cvp)) {
1208 *cvp = cv_clone(cv);
1209 SvREFCNT_dec(cv);
1210 }
1211
288b8c02 1212 if (pkg) {
f815daf2 1213 HV *const stash = gv_stashsv(pkg, GV_ADD);
a954f6ee 1214 SvREFCNT_dec(pkg);
288b8c02
NC
1215 (void)sv_bless(rv, stash);
1216 }
1217
9274aefd 1218 if (RX_EXTFLAGS(rx) & RXf_TAINTED) {
e08e52cf 1219 SvTAINTED_on(rv);
9274aefd
DM
1220 SvTAINTED_on(SvRV(rv));
1221 }
c8c13c22 1222 XPUSHs(rv);
1223 RETURN;
8782bef2
GB
1224}
1225
a0d0e21e
LW
1226PP(pp_match)
1227{
97aff369 1228 dVAR; dSP; dTARG;
eb578fdb 1229 PMOP *pm = cPMOP;
d65afb4b 1230 PMOP *dynpm = pm;
eb578fdb
KW
1231 const char *t;
1232 const char *s;
5c144d81 1233 const char *strend;
a0d0e21e 1234 I32 global;
1ed74d04 1235 U8 r_flags = REXEC_CHECKED;
5c144d81 1236 const char *truebase; /* Start of string */
eb578fdb 1237 REGEXP *rx = PM_GETRE(pm);
b3eb6a9b 1238 bool rxtainted;
a3b680e6 1239 const I32 gimme = GIMME;
a0d0e21e 1240 STRLEN len;
748a9306 1241 I32 minmatch = 0;
a3b680e6 1242 const I32 oldsave = PL_savestack_ix;
f86702cc 1243 I32 update_minmatch = 1;
e60df1fa 1244 I32 had_zerolen = 0;
58e23c8d 1245 U32 gpos = 0;
a0d0e21e 1246
533c011a 1247 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 1248 TARG = POPs;
59f00321
RGS
1249 else if (PL_op->op_private & OPpTARGET_MY)
1250 GETTARGET;
a0d0e21e 1251 else {
54b9620d 1252 TARG = DEFSV;
a0d0e21e
LW
1253 EXTEND(SP,1);
1254 }
d9f424b2 1255
c277df42 1256 PUTBACK; /* EVAL blocks need stack_sp. */
69dc4b30
FC
1257 /* Skip get-magic if this is a qr// clone, because regcomp has
1258 already done it. */
1259 s = ((struct regexp *)SvANY(rx))->mother_re
1260 ? SvPV_nomg_const(TARG, len)
1261 : SvPV_const(TARG, len);
a0d0e21e 1262 if (!s)
2269b42e 1263 DIE(aTHX_ "panic: pp_match");
890ce7af 1264 strend = s + len;
07bc277f 1265 rxtainted = ((RX_EXTFLAGS(rx) & RXf_TAINTED) ||
3280af22 1266 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
9212bbba 1267 TAINT_NOT;
a0d0e21e 1268
a30b2f1f 1269 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 1270
d65afb4b 1271 /* PMdf_USED is set after a ?? matches once */
c737faaf
YO
1272 if (
1273#ifdef USE_ITHREADS
1274 SvREADONLY(PL_regex_pad[pm->op_pmoffset])
1275#else
1276 pm->op_pmflags & PMf_USED
1277#endif
1278 ) {
e5dc5375 1279 DEBUG_r(PerlIO_printf(Perl_debug_log, "?? already matched once"));
c277df42 1280 failure:
e5dc5375 1281
a0d0e21e
LW
1282 if (gimme == G_ARRAY)
1283 RETURN;
1284 RETPUSHNO;
1285 }
1286
c737faaf
YO
1287
1288
d65afb4b 1289 /* empty pattern special-cased to use last successful pattern if possible */
220fc49f 1290 if (!RX_PRELEN(rx) && PL_curpm) {
3280af22 1291 pm = PL_curpm;
aaa362c4 1292 rx = PM_GETRE(pm);
a0d0e21e 1293 }
d65afb4b 1294
e5dc5375
KW
1295 if (RX_MINLEN(rx) > (I32)len) {
1296 DEBUG_r(PerlIO_printf(Perl_debug_log, "String shorter than min possible regex match\n"));
d65afb4b 1297 goto failure;
e5dc5375 1298 }
c277df42 1299
a0d0e21e 1300 truebase = t = s;
ad94a511
IZ
1301
1302 /* XXXX What part of this is needed with true \G-support? */
d65afb4b 1303 if ((global = dynpm->op_pmflags & PMf_GLOBAL)) {
07bc277f 1304 RX_OFFS(rx)[0].start = -1;
a0d0e21e 1305 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
c445ea15 1306 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
565764a8 1307 if (mg && mg->mg_len >= 0) {
07bc277f
NC
1308 if (!(RX_EXTFLAGS(rx) & RXf_GPOS_SEEN))
1309 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1310 else if (RX_EXTFLAGS(rx) & RXf_ANCH_GPOS) {
0ef3e39e 1311 r_flags |= REXEC_IGNOREPOS;
07bc277f
NC
1312 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1313 } else if (RX_EXTFLAGS(rx) & RXf_GPOS_FLOAT)
58e23c8d
YO
1314 gpos = mg->mg_len;
1315 else
07bc277f
NC
1316 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1317 minmatch = (mg->mg_flags & MGf_MINMATCH) ? RX_GOFS(rx) + 1 : 0;
f86702cc 1318 update_minmatch = 0;
748a9306 1319 }
a0d0e21e
LW
1320 }
1321 }
a41aa44d 1322 if ( RX_NPARENS(rx)
6502e081 1323 || PL_sawampersand
6502e081
DM
1324 || (RX_EXTFLAGS(rx) & (RXf_EVAL_SEEN|RXf_PMf_KEEPCOPY))
1325 ) {
1326 r_flags |= (REXEC_COPY_STR|REXEC_COPY_SKIP_PRE);
1327 /* in @a =~ /(.)/g, we iterate multiple times, but copy the buffer
1328 * only on the first iteration. Therefore we need to copy $' as well
1329 * as $&, to make the rest of the string available for captures in
1330 * subsequent iterations */
1331 if (! (global && gimme == G_ARRAY))
1332 r_flags |= REXEC_COPY_SKIP_POST;
1333 };
22e551b9 1334
d7be1480 1335 play_it_again:
07bc277f
NC
1336 if (global && RX_OFFS(rx)[0].start != -1) {
1337 t = s = RX_OFFS(rx)[0].end + truebase - RX_GOFS(rx);
e5dc5375
KW
1338 if ((s + RX_MINLEN(rx)) > strend || s < truebase) {
1339 DEBUG_r(PerlIO_printf(Perl_debug_log, "Regex match can't succeed, so not even tried\n"));
a0d0e21e 1340 goto nope;
e5dc5375 1341 }
f86702cc 1342 if (update_minmatch++)
e60df1fa 1343 minmatch = had_zerolen;
a0d0e21e 1344 }
07bc277f 1345 if (RX_EXTFLAGS(rx) & RXf_USE_INTUIT &&
3c8556c3 1346 DO_UTF8(TARG) == (RX_UTF8(rx) != 0)) {
5c144d81
NC
1347 /* FIXME - can PL_bostr be made const char *? */
1348 PL_bostr = (char *)truebase;
f9f4320a 1349 s = CALLREG_INTUIT_START(rx, TARG, (char *)s, (char *)strend, r_flags, NULL);
f722798b
IZ
1350
1351 if (!s)
1352 goto nope;
07bc277f 1353 if ( (RX_EXTFLAGS(rx) & RXf_CHECK_ALL)
14977893 1354 && !PL_sawampersand
07bc277f 1355 && !(RX_EXTFLAGS(rx) & RXf_PMf_KEEPCOPY)
05b4157f 1356 && !SvROK(TARG)) /* Cannot trust since INTUIT cannot guess ^ */
f722798b 1357 goto yup;
a0d0e21e 1358 }
77da2310
NC
1359 if (!CALLREGEXEC(rx, (char*)s, (char *)strend, (char*)truebase,
1360 minmatch, TARG, NUM2PTR(void*, gpos), r_flags))
1361 goto ret_no;
1362
1363 PL_curpm = pm;
1364 if (dynpm->op_pmflags & PMf_ONCE) {
c737faaf 1365#ifdef USE_ITHREADS
77da2310 1366 SvREADONLY_on(PL_regex_pad[dynpm->op_pmoffset]);
c737faaf 1367#else
77da2310 1368 dynpm->op_pmflags |= PMf_USED;
c737faaf 1369#endif
a0d0e21e 1370 }
a0d0e21e
LW
1371
1372 gotcha:
72311751
GS
1373 if (rxtainted)
1374 RX_MATCH_TAINTED_on(rx);
1375 TAINT_IF(RX_MATCH_TAINTED(rx));
a0d0e21e 1376 if (gimme == G_ARRAY) {
07bc277f 1377 const I32 nparens = RX_NPARENS(rx);
a3b680e6 1378 I32 i = (global && !nparens) ? 1 : 0;
a0d0e21e 1379
c277df42 1380 SPAGAIN; /* EVAL blocks could move the stack. */
ffc61ed2
JH
1381 EXTEND(SP, nparens + i);
1382 EXTEND_MORTAL(nparens + i);
1383 for (i = !i; i <= nparens; i++) {
a0d0e21e 1384 PUSHs(sv_newmortal());
07bc277f
NC
1385 if ((RX_OFFS(rx)[i].start != -1) && RX_OFFS(rx)[i].end != -1 ) {
1386 const I32 len = RX_OFFS(rx)[i].end - RX_OFFS(rx)[i].start;
1387 s = RX_OFFS(rx)[i].start + truebase;
1388 if (RX_OFFS(rx)[i].end < 0 || RX_OFFS(rx)[i].start < 0 ||
290deeac 1389 len < 0 || len > strend - s)
5637ef5b
NC
1390 DIE(aTHX_ "panic: pp_match start/end pointers, i=%ld, "
1391 "start=%ld, end=%ld, s=%p, strend=%p, len=%"UVuf,
1392 (long) i, (long) RX_OFFS(rx)[i].start,
1393 (long)RX_OFFS(rx)[i].end, s, strend, (UV) len);
a0d0e21e 1394 sv_setpvn(*SP, s, len);
cce850e4 1395 if (DO_UTF8(TARG) && is_utf8_string((U8*)s, len))
a197cbdd 1396 SvUTF8_on(*SP);
a0d0e21e
LW
1397 }
1398 }
1399 if (global) {
d65afb4b 1400 if (dynpm->op_pmflags & PMf_CONTINUE) {
6136c704 1401 MAGIC* mg = NULL;
0af80b60
HS
1402 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
1403 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1404 if (!mg) {
d83f0a82
NC
1405#ifdef PERL_OLD_COPY_ON_WRITE
1406 if (SvIsCOW(TARG))
1407 sv_force_normal_flags(TARG, 0);
1408#endif
1409 mg = sv_magicext(TARG, NULL, PERL_MAGIC_regex_global,
1410 &PL_vtbl_mglob, NULL, 0);
0af80b60 1411 }
07bc277f
NC
1412 if (RX_OFFS(rx)[0].start != -1) {
1413 mg->mg_len = RX_OFFS(rx)[0].end;
1414 if (RX_OFFS(rx)[0].start + RX_GOFS(rx) == (UV)RX_OFFS(rx)[0].end)
0af80b60
HS
1415 mg->mg_flags |= MGf_MINMATCH;
1416 else
1417 mg->mg_flags &= ~MGf_MINMATCH;
1418 }
1419 }
07bc277f
NC
1420 had_zerolen = (RX_OFFS(rx)[0].start != -1
1421 && (RX_OFFS(rx)[0].start + RX_GOFS(rx)
1422 == (UV)RX_OFFS(rx)[0].end));
c277df42 1423 PUTBACK; /* EVAL blocks may use stack */
cf93c79d 1424 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
1425 goto play_it_again;
1426 }
ffc61ed2 1427 else if (!nparens)
bde848c5 1428 XPUSHs(&PL_sv_yes);
4633a7c4 1429 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1430 RETURN;
1431 }
1432 else {
1433 if (global) {
cbbf8932 1434 MAGIC* mg;
a0d0e21e 1435 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
14befaf4 1436 mg = mg_find(TARG, PERL_MAGIC_regex_global);
cbbf8932
AL
1437 else
1438 mg = NULL;
a0d0e21e 1439 if (!mg) {
d83f0a82
NC
1440#ifdef PERL_OLD_COPY_ON_WRITE
1441 if (SvIsCOW(TARG))
1442 sv_force_normal_flags(TARG, 0);
1443#endif
1444 mg = sv_magicext(TARG, NULL, PERL_MAGIC_regex_global,
1445 &PL_vtbl_mglob, NULL, 0);
a0d0e21e 1446 }
07bc277f
NC
1447 if (RX_OFFS(rx)[0].start != -1) {
1448 mg->mg_len = RX_OFFS(rx)[0].end;
1449 if (RX_OFFS(rx)[0].start + RX_GOFS(rx) == (UV)RX_OFFS(rx)[0].end)
748a9306
LW
1450 mg->mg_flags |= MGf_MINMATCH;
1451 else
1452 mg->mg_flags &= ~MGf_MINMATCH;
1453 }
a0d0e21e 1454 }
4633a7c4 1455 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1456 RETPUSHYES;
1457 }
1458
f722798b 1459yup: /* Confirmed by INTUIT */
72311751
GS
1460 if (rxtainted)
1461 RX_MATCH_TAINTED_on(rx);
1462 TAINT_IF(RX_MATCH_TAINTED(rx));
3280af22 1463 PL_curpm = pm;
c737faaf
YO
1464 if (dynpm->op_pmflags & PMf_ONCE) {
1465#ifdef USE_ITHREADS
1466 SvREADONLY_on(PL_regex_pad[dynpm->op_pmoffset]);
1467#else
1468 dynpm->op_pmflags |= PMf_USED;
1469#endif
1470 }
cf93c79d 1471 if (RX_MATCH_COPIED(rx))
07bc277f 1472 Safefree(RX_SUBBEG(rx));
cf93c79d 1473 RX_MATCH_COPIED_off(rx);
07bc277f 1474 RX_SUBBEG(rx) = NULL;
a0d0e21e 1475 if (global) {
5c144d81 1476 /* FIXME - should rx->subbeg be const char *? */
07bc277f 1477 RX_SUBBEG(rx) = (char *) truebase;
6502e081
DM
1478 RX_SUBOFFSET(rx) = 0;
1479 RX_SUBCOFFSET(rx) = 0;
07bc277f 1480 RX_OFFS(rx)[0].start = s - truebase;
a30b2f1f 1481 if (RX_MATCH_UTF8(rx)) {
07bc277f
NC
1482 char * const t = (char*)utf8_hop((U8*)s, RX_MINLENRET(rx));
1483 RX_OFFS(rx)[0].end = t - truebase;
60aeb6fd
NIS
1484 }
1485 else {
07bc277f 1486 RX_OFFS(rx)[0].end = s - truebase + RX_MINLENRET(rx);
60aeb6fd 1487 }
07bc277f 1488 RX_SUBLEN(rx) = strend - truebase;
a0d0e21e 1489 goto gotcha;
1c846c1f 1490 }
07bc277f 1491 if (PL_sawampersand || RX_EXTFLAGS(rx) & RXf_PMf_KEEPCOPY) {
14977893 1492 I32 off;
f8c7b90f 1493#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
1494 if (SvIsCOW(TARG) || (SvFLAGS(TARG) & CAN_COW_MASK) == CAN_COW_FLAGS) {
1495 if (DEBUG_C_TEST) {
1496 PerlIO_printf(Perl_debug_log,
1497 "Copy on write: pp_match $& capture, type %d, truebase=%p, t=%p, difference %d\n",
6c9570dc 1498 (int) SvTYPE(TARG), (void*)truebase, (void*)t,
ed252734
NC
1499 (int)(t-truebase));
1500 }
bdd9a1b1
NC
1501 RX_SAVED_COPY(rx) = sv_setsv_cow(RX_SAVED_COPY(rx), TARG);
1502 RX_SUBBEG(rx)
1503 = (char *) SvPVX_const(RX_SAVED_COPY(rx)) + (t - truebase);
1504 assert (SvPOKp(RX_SAVED_COPY(rx)));
ed252734
NC
1505 } else
1506#endif
1507 {
14977893 1508
07bc277f 1509 RX_SUBBEG(rx) = savepvn(t, strend - t);
f8c7b90f 1510#ifdef PERL_OLD_COPY_ON_WRITE
bdd9a1b1 1511 RX_SAVED_COPY(rx) = NULL;
ed252734
NC
1512#endif
1513 }
07bc277f 1514 RX_SUBLEN(rx) = strend - t;
6502e081
DM
1515 RX_SUBOFFSET(rx) = 0;
1516 RX_SUBCOFFSET(rx) = 0;
14977893 1517 RX_MATCH_COPIED_on(rx);
07bc277f
NC
1518 off = RX_OFFS(rx)[0].start = s - t;
1519 RX_OFFS(rx)[0].end = off + RX_MINLENRET(rx);
14977893
JH
1520 }
1521 else { /* startp/endp are used by @- @+. */
07bc277f
NC
1522 RX_OFFS(rx)[0].start = s - truebase;
1523 RX_OFFS(rx)[0].end = s - truebase + RX_MINLENRET(rx);
14977893 1524 }
7e1a2c8d
DM
1525 /* match via INTUIT shouldn't have any captures. Let @-, @+, $^N know */
1526 assert(!RX_NPARENS(rx));
1527 RX_LASTPAREN(rx) = RX_LASTCLOSEPAREN(rx) = 0;
4633a7c4 1528 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1529 RETPUSHYES;
1530
1531nope:
a0d0e21e 1532ret_no:
d65afb4b 1533 if (global && !(dynpm->op_pmflags & PMf_CONTINUE)) {
a0d0e21e 1534 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
6136c704 1535 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1536 if (mg)
565764a8 1537 mg->mg_len = -1;
a0d0e21e
LW
1538 }
1539 }
4633a7c4 1540 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1541 if (gimme == G_ARRAY)
1542 RETURN;
1543 RETPUSHNO;
1544}
1545
1546OP *
864dbfa3 1547Perl_do_readline(pTHX)
a0d0e21e 1548{
27da23d5 1549 dVAR; dSP; dTARGETSTACKED;
eb578fdb 1550 SV *sv;
a0d0e21e
LW
1551 STRLEN tmplen = 0;
1552 STRLEN offset;
760ac839 1553 PerlIO *fp;
eb578fdb
KW
1554 IO * const io = GvIO(PL_last_in_gv);
1555 const I32 type = PL_op->op_type;
a3b680e6 1556 const I32 gimme = GIMME_V;
a0d0e21e 1557
6136c704 1558 if (io) {
50db69d8 1559 const MAGIC *const mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar);
6136c704 1560 if (mg) {
50db69d8 1561 Perl_tied_method(aTHX_ "READLINE", SP, MUTABLE_SV(io), mg, gimme, 0);
6136c704 1562 if (gimme == G_SCALAR) {
50db69d8
NC
1563 SPAGAIN;
1564 SvSetSV_nosteal(TARG, TOPs);
1565 SETTARG;
6136c704 1566 }
50db69d8 1567 return NORMAL;
0b7c7b4f 1568 }
e79b0511 1569 }
4608196e 1570 fp = NULL;
a0d0e21e
LW
1571 if (io) {
1572 fp = IoIFP(io);
1573 if (!fp) {
1574 if (IoFLAGS(io) & IOf_ARGV) {
1575 if (IoFLAGS(io) & IOf_START) {
a0d0e21e 1576 IoLINES(io) = 0;
3280af22 1577 if (av_len(GvAVn(PL_last_in_gv)) < 0) {
1d7c1841 1578 IoFLAGS(io) &= ~IOf_START;
4608196e 1579 do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,NULL);
4bac9ae4 1580 SvTAINTED_off(GvSVn(PL_last_in_gv)); /* previous tainting irrelevant */
76f68e9b 1581 sv_setpvs(GvSVn(PL_last_in_gv), "-");
3280af22 1582 SvSETMAGIC(GvSV(PL_last_in_gv));
a2008d6d
GS
1583 fp = IoIFP(io);
1584 goto have_fp;
a0d0e21e
LW
1585 }
1586 }
3280af22 1587 fp = nextargv(PL_last_in_gv);
a0d0e21e 1588 if (!fp) { /* Note: fp != IoIFP(io) */
3280af22 1589 (void)do_close(PL_last_in_gv, FALSE); /* now it does*/
a0d0e21e
LW
1590 }
1591 }
0d44d22b
NC
1592 else if (type == OP_GLOB)
1593 fp = Perl_start_glob(aTHX_ POPs, io);
a0d0e21e
LW
1594 }
1595 else if (type == OP_GLOB)
1596 SP--;
7716c5c5 1597 else if (IoTYPE(io) == IoTYPE_WRONLY) {
a5390457 1598 report_wrongway_fh(PL_last_in_gv, '>');
a00b5bd3 1599 }
a0d0e21e
LW
1600 }
1601 if (!fp) {
041457d9
DM
1602 if ((!io || !(IoFLAGS(io) & IOf_START))
1603 && ckWARN2(WARN_GLOB, WARN_CLOSED))
1604 {
3f4520fe 1605 if (type == OP_GLOB)
63922903 1606 Perl_ck_warner_d(aTHX_ packWARN(WARN_GLOB),
af8c498a
GS
1607 "glob failed (can't start child: %s)",
1608 Strerror(errno));
69282e91 1609 else
831e4cc3 1610 report_evil_fh(PL_last_in_gv);
3f4520fe 1611 }
54310121 1612 if (gimme == G_SCALAR) {
79628082 1613 /* undef TARG, and push that undefined value */
ba92458f
AE
1614 if (type != OP_RCATLINE) {
1615 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1616 SvOK_off(TARG);
ba92458f 1617 }
a0d0e21e
LW
1618 PUSHTARG;
1619 }
1620 RETURN;
1621 }
a2008d6d 1622 have_fp:
54310121 1623 if (gimme == G_SCALAR) {
a0d0e21e 1624 sv = TARG;
0f722b55
RGS
1625 if (type == OP_RCATLINE && SvGMAGICAL(sv))
1626 mg_get(sv);
48de12d9
RGS
1627 if (SvROK(sv)) {
1628 if (type == OP_RCATLINE)
5668452f 1629 SvPV_force_nomg_nolen(sv);
48de12d9
RGS
1630 else
1631 sv_unref(sv);
1632 }
f7877b28 1633 else if (isGV_with_GP(sv)) {
5668452f 1634 SvPV_force_nomg_nolen(sv);
f7877b28 1635 }
862a34c6 1636 SvUPGRADE(sv, SVt_PV);
a0d0e21e 1637 tmplen = SvLEN(sv); /* remember if already alloced */
f72e8700
JJ
1638 if (!tmplen && !SvREADONLY(sv)) {
1639 /* try short-buffering it. Please update t/op/readline.t
1640 * if you change the growth length.
1641 */
1642 Sv_Grow(sv, 80);
1643 }
2b5e58c4
AMS
1644 offset = 0;
1645 if (type == OP_RCATLINE && SvOK(sv)) {
1646 if (!SvPOK(sv)) {
5668452f 1647 SvPV_force_nomg_nolen(sv);
2b5e58c4 1648 }
a0d0e21e 1649 offset = SvCUR(sv);
2b5e58c4 1650 }
a0d0e21e 1651 }
54310121 1652 else {
561b68a9 1653 sv = sv_2mortal(newSV(80));
54310121
PP
1654 offset = 0;
1655 }
fbad3eb5 1656
3887d568
AP
1657 /* This should not be marked tainted if the fp is marked clean */
1658#define MAYBE_TAINT_LINE(io, sv) \
1659 if (!(IoFLAGS(io) & IOf_UNTAINT)) { \
1660 TAINT; \
1661 SvTAINTED_on(sv); \
1662 }
1663
684bef36 1664/* delay EOF state for a snarfed empty file */
fbad3eb5 1665#define SNARF_EOF(gimme,rs,io,sv) \
684bef36 1666 (gimme != G_SCALAR || SvCUR(sv) \
b9fee9ba 1667 || (IoFLAGS(io) & IOf_NOLINE) || !RsSNARF(rs))
fbad3eb5 1668
a0d0e21e 1669 for (;;) {
09e8efcc 1670 PUTBACK;
fbad3eb5 1671 if (!sv_gets(sv, fp, offset)
2d726892
TF
1672 && (type == OP_GLOB
1673 || SNARF_EOF(gimme, PL_rs, io, sv)
1674 || PerlIO_error(fp)))
fbad3eb5 1675 {
760ac839 1676 PerlIO_clearerr(fp);
a0d0e21e 1677 if (IoFLAGS(io) & IOf_ARGV) {
3280af22 1678 fp = nextargv(PL_last_in_gv);
a0d0e21e
LW
1679 if (fp)
1680 continue;
3280af22 1681 (void)do_close(PL_last_in_gv, FALSE);
a0d0e21e
LW
1682 }
1683 else if (type == OP_GLOB) {
a2a5de95
NC
1684 if (!do_close(PL_last_in_gv, FALSE)) {
1685 Perl_ck_warner(aTHX_ packWARN(WARN_GLOB),
1686 "glob failed (child exited with status %d%s)",
1687 (int)(STATUS_CURRENT >> 8),
1688 (STATUS_CURRENT & 0x80) ? ", core dumped" : "");
4eb79ab5 1689 }
a0d0e21e 1690 }
54310121 1691 if (gimme == G_SCALAR) {
ba92458f
AE
1692 if (type != OP_RCATLINE) {
1693 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1694 SvOK_off(TARG);
ba92458f 1695 }
09e8efcc 1696 SPAGAIN;
a0d0e21e
LW
1697 PUSHTARG;
1698 }
3887d568 1699 MAYBE_TAINT_LINE(io, sv);
a0d0e21e
LW
1700 RETURN;
1701 }
3887d568 1702 MAYBE_TAINT_LINE(io, sv);
a0d0e21e 1703 IoLINES(io)++;
b9fee9ba 1704 IoFLAGS(io) |= IOf_NOLINE;
71be2cbc 1705 SvSETMAGIC(sv);
09e8efcc 1706 SPAGAIN;
a0d0e21e 1707 XPUSHs(sv);
a0d0e21e 1708 if (type == OP_GLOB) {
349d4f2f 1709 const char *t1;
a0d0e21e 1710
3280af22 1711 if (SvCUR(sv) > 0 && SvCUR(PL_rs) > 0) {
6136c704 1712 char * const tmps = SvEND(sv) - 1;
aa07b2f6 1713 if (*tmps == *SvPVX_const(PL_rs)) {
c07a80fd 1714 *tmps = '\0';
b162af07 1715 SvCUR_set(sv, SvCUR(sv) - 1);
c07a80fd
PP
1716 }
1717 }
349d4f2f 1718 for (t1 = SvPVX_const(sv); *t1; t1++)
937b2e03 1719 if (!isALNUMC(*t1) &&
349d4f2f 1720 strchr("$&*(){}[]'\";\\|?<>~`", *t1))
a0d0e21e 1721 break;
349d4f2f 1722 if (*t1 && PerlLIO_lstat(SvPVX_const(sv), &PL_statbuf) < 0) {
a0d0e21e
LW
1723 (void)POPs; /* Unmatched wildcard? Chuck it... */
1724 continue;
1725 }
2d79bf7f 1726 } else if (SvUTF8(sv)) { /* OP_READLINE, OP_RCATLINE */
d4c19fe8
AL
1727 if (ckWARN(WARN_UTF8)) {
1728 const U8 * const s = (const U8*)SvPVX_const(sv) + offset;
1729 const STRLEN len = SvCUR(sv) - offset;
1730 const U8 *f;
1731
1732 if (!is_utf8_string_loc(s, len, &f))
1733 /* Emulate :encoding(utf8) warning in the same case. */
1734 Perl_warner(aTHX_ packWARN(WARN_UTF8),
1735 "utf8 \"\\x%02X\" does not map to Unicode",
1736 f < (U8*)SvEND(sv) ? *f : 0);
1737 }
a0d0e21e 1738 }
54310121 1739 if (gimme == G_ARRAY) {
a0d0e21e 1740 if (SvLEN(sv) - SvCUR(sv) > 20) {
1da4ca5f 1741 SvPV_shrink_to_cur(sv);
a0d0e21e 1742 }
561b68a9 1743 sv = sv_2mortal(newSV(80));
a0d0e21e
LW
1744 continue;
1745 }
54310121 1746 else if (gimme == G_SCALAR && !tmplen && SvLEN(sv) - SvCUR(sv) > 80) {
a0d0e21e 1747 /* try to reclaim a bit of scalar space (only on 1st alloc) */
d5b5861b
NC
1748 const STRLEN new_len
1749 = SvCUR(sv) < 60 ? 80 : SvCUR(sv)+40; /* allow some slop */
1da4ca5f 1750 SvPV_renew(sv, new_len);
a0d0e21e
LW
1751 }
1752 RETURN;
1753 }
1754}
1755
a0d0e21e
LW
1756PP(pp_helem)
1757{
97aff369 1758 dVAR; dSP;
760ac839 1759 HE* he;
ae77835f 1760 SV **svp;
c445ea15 1761 SV * const keysv = POPs;
85fbaab2 1762 HV * const hv = MUTABLE_HV(POPs);
a3b680e6
AL
1763 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
1764 const U32 defer = PL_op->op_private & OPpLVAL_DEFER;
be6c24e0 1765 SV *sv;
c158a4fd 1766 const U32 hash = (SvIsCOW_shared_hash(keysv)) ? SvSHARED_HASH(keysv) : 0;
92970b93 1767 const bool localizing = PL_op->op_private & OPpLVAL_INTRO;
d30e492c 1768 bool preeminent = TRUE;
a0d0e21e 1769
d4c19fe8 1770 if (SvTYPE(hv) != SVt_PVHV)
a0d0e21e 1771 RETPUSHUNDEF;
d4c19fe8 1772
92970b93 1773 if (localizing) {
d4c19fe8
AL
1774 MAGIC *mg;
1775 HV *stash;
d30e492c
VP
1776
1777 /* If we can determine whether the element exist,
1778 * Try to preserve the existenceness of a tied hash
1779 * element by using EXISTS and DELETE if possible.
1780 * Fallback to FETCH and STORE otherwise. */
2c5f48c2 1781 if (SvCANEXISTDELETE(hv))
d30e492c 1782 preeminent = hv_exists_ent(hv, keysv, 0);
d4c19fe8 1783 }
d30e492c 1784
d4c19fe8
AL
1785 he = hv_fetch_ent(hv, keysv, lval && !defer, hash);
1786 svp = he ? &HeVAL(he) : NULL;
a0d0e21e 1787 if (lval) {
746f6409 1788 if (!svp || !*svp || *svp == &PL_sv_undef) {
68dc0745
PP
1789 SV* lv;
1790 SV* key2;
2d8e6c8d 1791 if (!defer) {
be2597df 1792 DIE(aTHX_ PL_no_helem_sv, SVfARG(keysv));
2d8e6c8d 1793 }
68dc0745
PP
1794 lv = sv_newmortal();
1795 sv_upgrade(lv, SVt_PVLV);
1796 LvTYPE(lv) = 'y';
6136c704 1797 sv_magic(lv, key2 = newSVsv(keysv), PERL_MAGIC_defelem, NULL, 0);
68dc0745 1798 SvREFCNT_dec(key2); /* sv_magic() increments refcount */
b37c2d43 1799 LvTARG(lv) = SvREFCNT_inc_simple(hv);
68dc0745
PP
1800 LvTARGLEN(lv) = 1;
1801 PUSHs(lv);
1802 RETURN;
1803 }
92970b93 1804 if (localizing) {
bfcb3514 1805 if (HvNAME_get(hv) && isGV(*svp))
159b6efe 1806 save_gp(MUTABLE_GV(*svp), !(PL_op->op_flags & OPf_SPECIAL));
47cfc530
VP
1807 else if (preeminent)
1808 save_helem_flags(hv, keysv, svp,
1809 (PL_op->op_flags & OPf_SPECIAL) ? 0 : SAVEf_SETMAGIC);
1810 else
1811 SAVEHDELETE(hv, keysv);
5f05dabc 1812 }
9026059d
GG
1813 else if (PL_op->op_private & OPpDEREF) {
1814 PUSHs(vivify_ref(*svp, PL_op->op_private & OPpDEREF));
1815 RETURN;
1816 }
a0d0e21e 1817 }
746f6409 1818 sv = (svp && *svp ? *svp : &PL_sv_undef);
fd69380d
DM
1819 /* Originally this did a conditional C<sv = sv_mortalcopy(sv)>; this
1820 * was to make C<local $tied{foo} = $tied{foo}> possible.
1821 * However, it seems no longer to be needed for that purpose, and
1822 * introduced a new bug: stuff like C<while ($hash{taintedval} =~ /.../g>
1823 * would loop endlessly since the pos magic is getting set on the
1824 * mortal copy and lost. However, the copy has the effect of
1825 * triggering the get magic, and losing it altogether made things like
1826 * c<$tied{foo};> in void context no longer do get magic, which some
1827 * code relied on. Also, delayed triggering of magic on @+ and friends
1828 * meant the original regex may be out of scope by now. So as a
1829 * compromise, do the get magic here. (The MGf_GSKIP flag will stop it
1830 * being called too many times). */
39cf747a 1831 if (!lval && SvRMAGICAL(hv) && SvGMAGICAL(sv))
fd69380d 1832 mg_get(sv);
be6c24e0 1833 PUSHs(sv);
a0d0e21e
LW
1834 RETURN;
1835}
1836
a0d0e21e
LW
1837PP(pp_iter)
1838{
97aff369 1839 dVAR; dSP;
eb578fdb 1840 PERL_CONTEXT *cx;
dc09a129 1841 SV *sv, *oldsv;
1d7c1841 1842 SV **itersvp;
d01136d6
BS
1843 AV *av = NULL; /* used for LOOP_FOR on arrays and the stack */
1844 bool av_is_stack = FALSE;
a0d0e21e 1845
924508f0 1846 EXTEND(SP, 1);
a0d0e21e 1847 cx = &cxstack[cxstack_ix];
3b719c58 1848 if (!CxTYPE_is_LOOP(cx))
5637ef5b 1849 DIE(aTHX_ "panic: pp_iter, type=%u", CxTYPE(cx));
a0d0e21e 1850
1d7c1841 1851 itersvp = CxITERVAR(cx);
d01136d6 1852 if (CxTYPE(cx) == CXt_LOOP_LAZYSV) {
89ea2908 1853 /* string increment */
d01136d6
BS
1854 SV* cur = cx->blk_loop.state_u.lazysv.cur;
1855 SV *end = cx->blk_loop.state_u.lazysv.end;
267cc4a8
NC
1856 /* If the maximum is !SvOK(), pp_enteriter substitutes PL_sv_no.
1857 It has SvPVX of "" and SvCUR of 0, which is what we want. */
4fe3f0fa 1858 STRLEN maxlen = 0;
d01136d6 1859 const char *max = SvPV_const(end, maxlen);
89ea2908 1860 if (!SvNIOK(cur) && SvCUR(cur) <= maxlen) {
1d7c1841 1861 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1862 /* safe to reuse old SV */
1d7c1841 1863 sv_setsv(*itersvp, cur);
eaa5c2d6 1864 }
1c846c1f 1865 else
eaa5c2d6
GA
1866 {
1867 /* we need a fresh SV every time so that loop body sees a
1868 * completely new SV for closures/references to work as
1869 * they used to */
dc09a129 1870 oldsv = *itersvp;
1d7c1841 1871 *itersvp = newSVsv(cur);
dc09a129 1872 SvREFCNT_dec(oldsv);
eaa5c2d6 1873 }
aa07b2f6 1874 if (strEQ(SvPVX_const(cur), max))
89ea2908
GA
1875 sv_setiv(cur, 0); /* terminate next time */
1876 else
1877 sv_inc(cur);
1878 RETPUSHYES;
1879 }
1880 RETPUSHNO;
d01136d6
BS
1881 }
1882 else if (CxTYPE(cx) == CXt_LOOP_LAZYIV) {
89ea2908 1883 /* integer increment */
d01136d6 1884 if (cx->blk_loop.state_u.lazyiv.cur > cx->blk_loop.state_u.lazyiv.end)
89ea2908 1885 RETPUSHNO;
7f61b687 1886
3db8f154 1887 /* don't risk potential race */
1d7c1841 1888 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1889 /* safe to reuse old SV */
cdc1aa42 1890 sv_setiv(*itersvp, cx->blk_loop.state_u.lazyiv.cur);
eaa5c2d6 1891 }
1c846c1f 1892 else
eaa5c2d6
GA
1893 {
1894 /* we need a fresh SV every time so that loop body sees a
1895 * completely new SV for closures/references to work as they
1896 * used to */
dc09a129 1897 oldsv = *itersvp;
cdc1aa42 1898 *itersvp = newSViv(cx->blk_loop.state_u.lazyiv.cur);
dc09a129 1899 SvREFCNT_dec(oldsv);
eaa5c2d6 1900 }
a2309040 1901
cdc1aa42
NC
1902 if (cx->blk_loop.state_u.lazyiv.cur == IV_MAX) {
1903 /* Handle end of range at IV_MAX */
1904 cx->blk_loop.state_u.lazyiv.end = IV_MIN;
1905 } else
1906 ++cx->blk_loop.state_u.lazyiv.cur;
a2309040 1907
89ea2908
GA
1908 RETPUSHYES;
1909 }
1910
1911 /* iterate array */
d01136d6
BS
1912 assert(CxTYPE(cx) == CXt_LOOP_FOR);
1913 av = cx->blk_loop.state_u.ary.ary;
1914 if (!av) {
1915 av_is_stack = TRUE;
1916 av = PL_curstack;
1917 }
ef3e5ea9 1918 if (PL_op->op_private & OPpITER_REVERSED) {
d01136d6
BS
1919 if (cx->blk_loop.state_u.ary.ix <= (av_is_stack
1920 ? cx->blk_loop.resetsp + 1 : 0))
ef3e5ea9 1921 RETPUSHNO;
a0d0e21e 1922
ef3e5ea9 1923 if (SvMAGICAL(av) || AvREIFY(av)) {
d01136d6 1924 SV * const * const svp = av_fetch(av, --cx->blk_loop.state_u.ary.ix, FALSE);
a0714e2c 1925 sv = svp ? *svp : NULL;
ef3e5ea9
NC
1926 }
1927 else {
d01136d6 1928 sv = AvARRAY(av)[--cx->blk_loop.state_u.ary.ix];
ef3e5ea9 1929 }
d42935ef
JH
1930 }
1931 else {
d01136d6 1932 if (cx->blk_loop.state_u.ary.ix >= (av_is_stack ? cx->blk_oldsp :
ef3e5ea9
NC
1933 AvFILL(av)))
1934 RETPUSHNO;
1935
1936 if (SvMAGICAL(av) || AvREIFY(av)) {
d01136d6 1937 SV * const * const svp = av_fetch(av, ++cx->blk_loop.state_u.ary.ix, FALSE);
a0714e2c 1938 sv = svp ? *svp : NULL;
ef3e5ea9
NC
1939 }
1940 else {
d01136d6 1941 sv = AvARRAY(av)[++cx->blk_loop.state_u.ary.ix];
ef3e5ea9 1942 }
d42935ef 1943 }
ef3e5ea9 1944
0565a181 1945 if (sv && SvIS_FREED(sv)) {
a0714e2c 1946 *itersvp = NULL;
b6c83531 1947 Perl_croak(aTHX_ "Use of freed value in iteration");
cccede53
DM
1948 }
1949
d01136d6 1950 if (sv) {
a0d0e21e 1951 SvTEMP_off(sv);
d01136d6
BS
1952 SvREFCNT_inc_simple_void_NN(sv);
1953 }
a0d0e21e 1954 else
3280af22 1955 sv = &PL_sv_undef;
d01136d6
BS
1956 if (!av_is_stack && sv == &PL_sv_undef) {
1957 SV *lv = newSV_type(SVt_PVLV);
1958 LvTYPE(lv) = 'y';
1959 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
b37c2d43 1960 LvTARG(lv) = SvREFCNT_inc_simple(av);
d01136d6 1961 LvTARGOFF(lv) = cx->blk_loop.state_u.ary.ix;
42718184 1962 LvTARGLEN(lv) = (STRLEN)UV_MAX;
d01136d6 1963 sv = lv;
5f05dabc 1964 }
a0d0e21e 1965
dc09a129 1966 oldsv = *itersvp;
d01136d6 1967 *itersvp = sv;
dc09a129
DM
1968 SvREFCNT_dec(oldsv);
1969
a0d0e21e
LW
1970 RETPUSHYES;
1971}
1972
ef07e810
DM
1973/*
1974A description of how taint works in pattern matching and substitution.
1975
4e19c54b 1976While the pattern is being assembled/concatenated and then compiled,
0ab462a6
DM
1977PL_tainted will get set if any component of the pattern is tainted, e.g.
1978/.*$tainted/. At the end of pattern compilation, the RXf_TAINTED flag
1979is set on the pattern if PL_tainted is set.
ef07e810 1980
0ab462a6
DM
1981When the pattern is copied, e.g. $r = qr/..../, the SV holding the ref to
1982the pattern is marked as tainted. This means that subsequent usage, such
1983as /x$r/, will set PL_tainted, and thus RXf_TAINTED, on the new pattern too.
ef07e810
DM
1984
1985During execution of a pattern, locale-variant ops such as ALNUML set the
1986local flag RF_tainted. At the end of execution, the engine sets the
0ab462a6
DM
1987RXf_TAINTED_SEEN on the pattern if RF_tainted got set, or clears it
1988otherwise.
ef07e810
DM
1989
1990In addition, RXf_TAINTED_SEEN is used post-execution by the get magic code
1991of $1 et al to indicate whether the returned value should be tainted.
1992It is the responsibility of the caller of the pattern (i.e. pp_match,
1993pp_subst etc) to set this flag for any other circumstances where $1 needs
1994to be tainted.
1995
1996The taint behaviour of pp_subst (and pp_substcont) is quite complex.
1997
1998There are three possible sources of taint
1999 * the source string
2000 * the pattern (both compile- and run-time, RXf_TAINTED / RXf_TAINTED_SEEN)
2001 * the replacement string (or expression under /e)
2002
2003There are four destinations of taint and they are affected by the sources
2004according to the rules below:
2005
2006 * the return value (not including /r):
2007 tainted by the source string and pattern, but only for the
2008 number-of-iterations case; boolean returns aren't tainted;
2009 * the modified string (or modified copy under /r):
2010 tainted by the source string, pattern, and replacement strings;
2011 * $1 et al:
2012 tainted by the pattern, and under 'use re "taint"', by the source
2013 string too;
2014 * PL_taint - i.e. whether subsequent code (e.g. in a /e block) is tainted:
2015 should always be unset before executing subsequent code.
2016
2017The overall action of pp_subst is:
2018
2019 * at the start, set bits in rxtainted indicating the taint status of
2020 the various sources.
2021
2022 * After each pattern execution, update the SUBST_TAINT_PAT bit in
2023 rxtainted if RXf_TAINTED_SEEN has been set, to indicate that the
2024 pattern has subsequently become tainted via locale ops.
2025
2026 * If control is being passed to pp_substcont to execute a /e block,
2027 save rxtainted in the CXt_SUBST block, for future use by
2028 pp_substcont.
2029
2030 * Whenever control is being returned to perl code (either by falling
2031 off the "end" of pp_subst/pp_substcont, or by entering a /e block),
2032 use the flag bits in rxtainted to make all the appropriate types of
0ab462a6
DM
2033 destination taint visible; e.g. set RXf_TAINTED_SEEN so that $1
2034 et al will appear tainted.
ef07e810
DM
2035
2036pp_match is just a simpler version of the above.
2037
2038*/
2039
a0d0e21e
LW
2040PP(pp_subst)
2041{
97aff369 2042 dVAR; dSP; dTARG;
eb578fdb 2043 PMOP *pm = cPMOP;
a0d0e21e 2044 PMOP *rpm = pm;
eb578fdb 2045 char *s;
a0d0e21e 2046 char *strend;
eb578fdb 2047 char *m;
5c144d81 2048 const char *c;
eb578fdb 2049 char *d;
a0d0e21e
LW
2050 STRLEN clen;
2051 I32 iters = 0;
2052 I32 maxiters;
eb578fdb 2053 I32 i;
a0d0e21e 2054 bool once;
ef07e810
DM
2055 U8 rxtainted = 0; /* holds various SUBST_TAINT_* flag bits.
2056 See "how taint works" above */
a0d0e21e 2057 char *orig;
1ed74d04 2058 U8 r_flags;
eb578fdb 2059 REGEXP *rx = PM_GETRE(pm);
a0d0e21e
LW
2060 STRLEN len;
2061 int force_on_match = 0;
0bcc34c2 2062 const I32 oldsave = PL_savestack_ix;
792b2c16 2063 STRLEN slen;
f272994b 2064 bool doutf8 = FALSE;
f8c7b90f 2065#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2066 bool is_cow;
2067#endif
a0714e2c 2068 SV *nsv = NULL;
b770e143 2069 /* known replacement string? */
eb578fdb 2070 SV *dstr = (pm->op_pmflags & PMf_CONST) ? POPs : NULL;
a0d0e21e 2071
f410a211
NC
2072 PERL_ASYNC_CHECK();
2073
533c011a 2074 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 2075 TARG = POPs;
59f00321
RGS
2076 else if (PL_op->op_private & OPpTARGET_MY)
2077 GETTARGET;
a0d0e21e 2078 else {
54b9620d 2079 TARG = DEFSV;
a0d0e21e 2080 EXTEND(SP,1);
1c846c1f 2081 }
d9f424b2 2082
f8c7b90f 2083#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2084 /* Awooga. Awooga. "bool" types that are actually char are dangerous,
2085 because they make integers such as 256 "false". */
2086 is_cow = SvIsCOW(TARG) ? TRUE : FALSE;
2087#else
765f542d
NC
2088 if (SvIsCOW(TARG))
2089 sv_force_normal_flags(TARG,0);
ed252734 2090#endif
8ca8a454 2091 if (!(rpm->op_pmflags & PMf_NONDESTRUCT)
f8c7b90f 2092#ifdef PERL_OLD_COPY_ON_WRITE
8ca8a454 2093 && !is_cow
ed252734 2094#endif
8ca8a454
NC
2095 && (SvREADONLY(TARG)
2096 || ( ((SvTYPE(TARG) == SVt_PVGV && isGV_with_GP(TARG))
2097 || SvTYPE(TARG) > SVt_PVLV)
2098 && !(SvTYPE(TARG) == SVt_PVGV && SvFAKE(TARG)))))
6ad8f254 2099 Perl_croak_no_modify(aTHX);
8ec5e241
NIS
2100 PUTBACK;
2101
3e462cdc 2102 setup_match:
d5263905 2103 s = SvPV_mutable(TARG, len);
4499db73 2104 if (!SvPOKp(TARG) || SvTYPE(TARG) == SVt_PVGV || SvVOK(TARG))
a0d0e21e 2105 force_on_match = 1;
20be6587
DM
2106
2107 /* only replace once? */
2108 once = !(rpm->op_pmflags & PMf_GLOBAL);
2109
ef07e810 2110 /* See "how taint works" above */
20be6587
DM
2111 if (PL_tainting) {
2112 rxtainted = (
2113 (SvTAINTED(TARG) ? SUBST_TAINT_STR : 0)
2114 | ((RX_EXTFLAGS(rx) & RXf_TAINTED) ? SUBST_TAINT_PAT : 0)
2115 | ((pm->op_pmflags & PMf_RETAINT) ? SUBST_TAINT_RETAINT : 0)
2116 | ((once && !(rpm->op_pmflags & PMf_NONDESTRUCT))
2117 ? SUBST_TAINT_BOOLRET : 0));
2118 TAINT_NOT;
2119 }
a12c0f56 2120
a30b2f1f 2121 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 2122
a0d0e21e
LW
2123 force_it:
2124 if (!pm || !s)
5637ef5b 2125 DIE(aTHX_ "panic: pp_subst, pm=%p, s=%p", pm, s);
a0d0e21e
LW
2126
2127 strend = s + len;
a30b2f1f 2128 slen = RX_MATCH_UTF8(rx) ? utf8_length((U8*)s, (U8*)strend) : len;
792b2c16
JH
2129 maxiters = 2 * slen + 10; /* We can match twice at each
2130 position, once with zero-length,
2131 second time with non-zero. */
a0d0e21e 2132
220fc49f 2133 if (!RX_PRELEN(rx) && PL_curpm) {
3280af22 2134 pm = PL_curpm;
aaa362c4 2135 rx = PM_GETRE(pm);
a0d0e21e 2136 }
6502e081
DM
2137
2138 r_flags = ( RX_NPARENS(rx)
2139 || PL_sawampersand
6502e081
DM
2140 || (RX_EXTFLAGS(rx) & (RXf_EVAL_SEEN|RXf_PMf_KEEPCOPY))
2141 )
2142 ? REXEC_COPY_STR
2143 : 0;
7fba1cd6 2144
a0d0e21e 2145 orig = m = s;
07bc277f 2146 if (RX_EXTFLAGS(rx) & RXf_USE_INTUIT) {
ee0b7718 2147 PL_bostr = orig;
f9f4320a 2148 s = CALLREG_INTUIT_START(rx, TARG, s, strend, r_flags, NULL);
f722798b
IZ
2149
2150 if (!s)
df34c13a 2151 goto ret_no;
f722798b 2152 /* How to do it in subst? */
07bc277f 2153/* if ( (RX_EXTFLAGS(rx) & RXf_CHECK_ALL)
1c846c1f 2154 && !PL_sawampersand
a91cc451 2155 && !(RX_EXTFLAGS(rx) & RXf_KEEPCOPY))
f722798b
IZ
2156 goto yup;
2157*/
a0d0e21e 2158 }
71be2cbc 2159
8b64c330
DM
2160 if (!CALLREGEXEC(rx, s, strend, orig, 0, TARG, NULL,
2161 r_flags | REXEC_CHECKED))
2162 {
5e79dfb9
DM
2163 ret_no:
2164 SPAGAIN;
2165 PUSHs(rpm->op_pmflags & PMf_NONDESTRUCT ? TARG : &PL_sv_no);
2166 LEAVE_SCOPE(oldsave);
2167 RETURN;
2168 }
2169
71be2cbc 2170 /* known replacement string? */
f272994b 2171 if (dstr) {
20be6587
DM
2172 if (SvTAINTED(dstr))
2173 rxtainted |= SUBST_TAINT_REPL;
3e462cdc
KW
2174
2175 /* Upgrade the source if the replacement is utf8 but the source is not,
2176 * but only if it matched; see
2177 * http://www.nntp.perl.org/group/perl.perl5.porters/2010/04/msg158809.html
2178 */
5e79dfb9 2179 if (DO_UTF8(dstr) && ! DO_UTF8(TARG)) {
c95ca9b8
DM
2180 char * const orig_pvx = SvPVX(TARG);
2181 const STRLEN new_len = sv_utf8_upgrade_nomg(TARG);
3e462cdc
KW
2182
2183 /* If the lengths are the same, the pattern contains only
2184 * invariants, can keep going; otherwise, various internal markers
2185 * could be off, so redo */
c95ca9b8 2186 if (new_len != len || orig_pvx != SvPVX(TARG)) {
3e462cdc
KW
2187 goto setup_match;
2188 }
2189 }
2190
8514a05a
JH
2191 /* replacement needing upgrading? */
2192 if (DO_UTF8(TARG) && !doutf8) {
db79b45b 2193 nsv = sv_newmortal();
4a176938 2194 SvSetSV(nsv, dstr);
8514a05a
JH
2195 if (PL_encoding)
2196 sv_recode_to_utf8(nsv, PL_encoding);
2197 else
2198 sv_utf8_upgrade(nsv);
5c144d81 2199 c = SvPV_const(nsv, clen);
4a176938
JH
2200 doutf8 = TRUE;
2201 }
2202 else {
5c144d81 2203 c = SvPV_const(dstr, clen);
4a176938 2204 doutf8 = DO_UTF8(dstr);
8514a05a 2205 }
f272994b
A
2206 }
2207 else {
6136c704 2208 c = NULL;
f272994b
A
2209 doutf8 = FALSE;
2210 }
2211
71be2cbc 2212 /* can do inplace substitution? */
ed252734 2213 if (c
f8c7b90f 2214#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2215 && !is_cow
2216#endif
fbfb1899
DM
2217 && (I32)clen <= RX_MINLENRET(rx)
2218 && (once || !(r_flags & REXEC_COPY_STR))
07bc277f 2219 && !(RX_EXTFLAGS(rx) & RXf_LOOKBEHIND_SEEN)
8ca8a454
NC
2220 && (!doutf8 || SvUTF8(TARG))
2221 && !(rpm->op_pmflags & PMf_NONDESTRUCT))
8b030b38 2222 {
ec911639 2223
f8c7b90f 2224#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2225 if (SvIsCOW(TARG)) {
2226 assert (!force_on_match);
2227 goto have_a_cow;
2228 }
2229#endif
71be2cbc
PP
2230 if (force_on_match) {
2231 force_on_match = 0;
2232 s = SvPV_force(TARG, len);
2233 goto force_it;
2234 }
71be2cbc 2235 d = s;
3280af22 2236 PL_curpm = pm;
71be2cbc 2237 if (once) {
20be6587
DM
2238 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2239 rxtainted |= SUBST_TAINT_PAT;
07bc277f
NC
2240 m = orig + RX_OFFS(rx)[0].start;
2241 d = orig + RX_OFFS(rx)[0].end;
71be2cbc
PP
2242 s = orig;
2243 if (m - s > strend - d) { /* faster to shorten from end */
2244 if (clen) {
2245 Copy(c, m, clen, char);
2246 m += clen;
a0d0e21e 2247 }
71be2cbc
PP
2248 i = strend - d;
2249 if (i > 0) {
2250 Move(d, m, i, char);
2251 m += i;
a0d0e21e 2252 }
71be2cbc
PP
2253 *m = '\0';
2254 SvCUR_set(TARG, m - s);
2255 }
155aba94 2256 else if ((i = m - s)) { /* faster from front */
71be2cbc
PP
2257 d -= clen;
2258 m = d;
0d3c21b0 2259 Move(s, d - i, i, char);
71be2cbc 2260 sv_chop(TARG, d-i);
71be2cbc
PP
2261 if (clen)
2262 Copy(c, m, clen, char);
2263 }
2264 else if (clen) {
2265 d -= clen;
2266 sv_chop(TARG, d);
2267 Copy(c, d, clen, char);
2268 }
2269 else {
2270 sv_chop(TARG, d);
2271 }
8ec5e241 2272 SPAGAIN;
8ca8a454 2273 PUSHs(&PL_sv_yes);
71be2cbc
PP
2274 }
2275 else {
71be2cbc
PP
2276 do {
2277 if (iters++ > maxiters)
cea2e8a9 2278 DIE(aTHX_ "Substitution loop");
20be6587
DM
2279 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2280 rxtainted |= SUBST_TAINT_PAT;
07bc277f 2281 m = RX_OFFS(rx)[0].start + orig;
155aba94 2282 if ((i = m - s)) {
71be2cbc
PP
2283 if (s != d)
2284 Move(s, d, i, char);
2285 d += i;
a0d0e21e 2286 }
71be2cbc
PP
2287 if (clen) {
2288 Copy(c, d, clen, char);
2289 d += clen;
2290 }
07bc277f 2291 s = RX_OFFS(rx)[0].end + orig;
f9f4320a 2292 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
f722798b
IZ
2293 TARG, NULL,
2294 /* don't match same null twice */
2295 REXEC_NOT_FIRST|REXEC_IGNOREPOS));
71be2cbc
PP
2296 if (s != d) {
2297 i = strend - s;
aa07b2f6 2298 SvCUR_set(TARG, d - SvPVX_const(TARG) + i);
71be2cbc 2299 Move(s, d, i+1, char); /* include the NUL */
a0d0e21e 2300 }
8ec5e241 2301 SPAGAIN;
8ca8a454 2302 mPUSHi((I32)iters);
a0d0e21e
LW
2303 }
2304 }
ff6e92e8 2305 else {
a0d0e21e
LW
2306 if (force_on_match) {
2307 force_on_match = 0;
0c1438a1
NC
2308 if (rpm->op_pmflags & PMf_NONDESTRUCT) {
2309 /* I feel that it should be possible to avoid this mortal copy
2310 given that the code below copies into a new destination.
2311 However, I suspect it isn't worth the complexity of
2312 unravelling the C<goto force_it> for the small number of
2313 cases where it would be viable to drop into the copy code. */
2314 TARG = sv_2mortal(newSVsv(TARG));
2315 }
a0d0e21e
LW
2316 s = SvPV_force(TARG, len);
2317 goto force_it;
2318 }
f8c7b90f 2319#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2320 have_a_cow:
2321#endif
20be6587
DM
2322 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2323 rxtainted |= SUBST_TAINT_PAT;
815dd406 2324 dstr = newSVpvn_flags(m, s-m, SVs_TEMP | (DO_UTF8(TARG) ? SVf_UTF8 : 0));
3280af22 2325 PL_curpm = pm;
a0d0e21e 2326 if (!c) {
eb578fdb 2327 PERL_CONTEXT *cx;
8ec5e241 2328 SPAGAIN;
20be6587
DM
2329 /* note that a whole bunch of local vars are saved here for
2330 * use by pp_substcont: here's a list of them in case you're
2331 * searching for places in this sub that uses a particular var:
2332 * iters maxiters r_flags oldsave rxtainted orig dstr targ
2333 * s m strend rx once */
a0d0e21e 2334 PUSHSUBST(cx);
20e98b0f 2335 RETURNOP(cPMOP->op_pmreplrootu.op_pmreplroot);
a0d0e21e 2336 }
cf93c79d 2337 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
2338 do {
2339 if (iters++ > maxiters)
cea2e8a9 2340 DIE(aTHX_ "Substitution loop");
20be6587
DM
2341 if (RX_MATCH_TAINTED(rx))
2342 rxtainted |= SUBST_TAINT_PAT;
07bc277f 2343 if (RX_MATCH_COPIED(rx) && RX_SUBBEG(rx) != orig) {
a0d0e21e
LW
2344 m = s;
2345 s = orig;
6502e081 2346 assert(RX_SUBOFFSET(rx) == 0);
07bc277f 2347 orig = RX_SUBBEG(rx);
a0d0e21e
LW
2348 s = orig + (m - s);
2349 strend = s + (strend - m);
2350 }
07bc277f 2351 m = RX_OFFS(rx)[0].start + orig;
db79b45b 2352 if (doutf8 && !SvUTF8(dstr))
4bac9ae4 2353 sv_catpvn_nomg_utf8_upgrade(dstr, s, m - s, nsv);
db79b45b 2354 else
4bac9ae4 2355 sv_catpvn_nomg(dstr, s, m-s);
07bc277f 2356 s = RX_OFFS(rx)[0].end + orig;
a0d0e21e 2357 if (clen)
4bac9ae4 2358 sv_catpvn_nomg(dstr, c, clen);
a0d0e21e
LW
2359 if (once)
2360 break;
f9f4320a 2361 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
ffc61ed2 2362 TARG, NULL, r_flags));
db79b45b 2363 if (doutf8 && !DO_UTF8(TARG))
4bac9ae4 2364 sv_catpvn_nomg_utf8_upgrade(dstr, s, strend - s, nsv);
89afcb60 2365 else
4bac9ae4 2366 sv_catpvn_nomg(dstr, s, strend - s);
748a9306 2367
8ca8a454
NC
2368 if (rpm->op_pmflags & PMf_NONDESTRUCT) {
2369 /* From here on down we're using the copy, and leaving the original
2370 untouched. */
2371 TARG = dstr;
2372 SPAGAIN;
2373 PUSHs(dstr);
2374 } else {
f8c7b90f 2375#ifdef PERL_OLD_COPY_ON_WRITE
8ca8a454
NC
2376 /* The match may make the string COW. If so, brilliant, because
2377 that's just saved us one malloc, copy and free - the regexp has
2378 donated the old buffer, and we malloc an entirely new one, rather
2379 than the regexp malloc()ing a buffer and copying our original,
2380 only for us to throw it away here during the substitution. */
2381 if (SvIsCOW(TARG)) {
2382 sv_force_normal_flags(TARG, SV_COW_DROP_PV);
2383 } else
ed252734 2384#endif
8ca8a454
NC
2385 {
2386 SvPV_free(TARG);
2387 }
2388 SvPV_set(TARG, SvPVX(dstr));
2389 SvCUR_set(TARG, SvCUR(dstr));
2390 SvLEN_set(TARG, SvLEN(dstr));
2391 doutf8 |= DO_UTF8(dstr);
2392 SvPV_set(dstr, NULL);
748a9306 2393
8ca8a454 2394 SPAGAIN;
4f4d7508 2395 mPUSHi((I32)iters);
8ca8a454
NC
2396 }
2397 }
2398
2399 if (!(rpm->op_pmflags & PMf_NONDESTRUCT)) {
2400 (void)SvPOK_only_UTF8(TARG);
2401 if (doutf8)
2402 SvUTF8_on(TARG);
a0d0e21e 2403 }
20be6587 2404
ef07e810 2405 /* See "how taint works" above */
20be6587
DM
2406 if (PL_tainting) {
2407 if ((rxtainted & SUBST_TAINT_PAT) ||
2408 ((rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_RETAINT)) ==
2409 (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
2410 )
2411 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
2412
2413 if (!(rxtainted & SUBST_TAINT_BOOLRET)
2414 && (rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT))
2415 )
2416 SvTAINTED_on(TOPs); /* taint return value */
2417 else
2418 SvTAINTED_off(TOPs); /* may have got tainted earlier */
2419
2420 /* needed for mg_set below */
2421 PL_tainted =
2422 cBOOL(rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL));
2423 SvTAINT(TARG);
2424 }
2425 SvSETMAGIC(TARG); /* PL_tainted must be correctly set for this mg_set */
2426 TAINT_NOT;
f1a76097
DM
2427 LEAVE_SCOPE(oldsave);
2428 RETURN;
a0d0e21e
LW
2429}
2430
2431PP(pp_grepwhile)
2432{
27da23d5 2433 dVAR; dSP;
a0d0e21e
LW
2434
2435 if (SvTRUEx(POPs))
3280af22
NIS
2436 PL_stack_base[PL_markstack_ptr[-1]++] = PL_stack_base[*PL_markstack_ptr];
2437 ++*PL_markstack_ptr;
b2a2a901 2438 FREETMPS;
d343c3ef 2439 LEAVE_with_name("grep_item"); /* exit inner scope */
a0d0e21e
LW
2440
2441 /* All done yet? */
3280af22 2442 if (PL_stack_base + *PL_markstack_ptr > SP) {
a0d0e21e 2443 I32 items;
c4420975 2444 const I32 gimme = GIMME_V;
a0d0e21e 2445
d343c3ef 2446 LEAVE_with_name("grep"); /* exit outer scope */
a0d0e21e 2447 (void)POPMARK; /* pop src */
3280af22 2448 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 2449 (void)POPMARK; /* pop dst */
3280af22 2450 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 2451 if (gimme == G_SCALAR) {
7cc47870 2452 if (PL_op->op_private & OPpGREP_LEX) {
c4420975 2453 SV* const sv = sv_newmortal();
7cc47870
RGS
2454 sv_setiv(sv, items);
2455 PUSHs(sv);
2456 }
2457 else {
2458 dTARGET;
2459 XPUSHi(items);
2460 }
a0d0e21e 2461 }
54310121
PP
2462 else if (gimme == G_ARRAY)
2463 SP += items;
a0d0e21e
LW
2464 RETURN;
2465 }
2466 else {
2467 SV *src;
2468
d343c3ef 2469 ENTER_with_name("grep_item"); /* enter inner scope */
1d7c1841 2470 SAVEVPTR(PL_curpm);
a0d0e21e 2471
3280af22 2472 src = PL_stack_base[*PL_markstack_ptr];
a0d0e21e 2473 SvTEMP_off(src);
59f00321
RGS
2474 if (PL_op->op_private & OPpGREP_LEX)
2475 PAD_SVl(PL_op->op_targ) = src;
2476 else
414bf5ae 2477 DEFSV_set(src);
a0d0e21e
LW
2478
2479 RETURNOP(cLOGOP->op_other);
2480 }
2481}
2482
2483PP(pp_leavesub)
2484{
27da23d5 2485 dVAR; dSP;
a0d0e21e
LW
2486 SV **mark;
2487 SV **newsp;
2488 PMOP *newpm;
2489 I32 gimme;
eb578fdb 2490 PERL_CONTEXT *cx;
b0d9ce38 2491 SV *sv;
a0d0e21e 2492
9850bf21
RH
2493 if (CxMULTICALL(&cxstack[cxstack_ix]))
2494 return 0;
2495
a0d0e21e 2496 POPBLOCK(cx,newpm);
5dd42e15 2497 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2498
a1f49e72 2499 TAINT_NOT;
a0d0e21e
LW
2500 if (gimme == G_SCALAR) {
2501 MARK = newsp + 1;
a29cdaf0 2502 if (MARK <= SP) {
a8bba7fa 2503 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
6f48390a
FC
2504 if (SvTEMP(TOPs) && SvREFCNT(TOPs) == 1
2505 && !SvMAGICAL(TOPs)) {
a29cdaf0
IZ
2506 *MARK = SvREFCNT_inc(TOPs);
2507 FREETMPS;
2508 sv_2mortal(*MARK);
cd06dffe
GS
2509 }
2510 else {
959e3673 2511 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
a29cdaf0 2512 FREETMPS;
959e3673
GS
2513 *MARK = sv_mortalcopy(sv);
2514 SvREFCNT_dec(sv);
a29cdaf0 2515 }
cd06dffe 2516 }
6f48390a
FC
2517 else if (SvTEMP(TOPs) && SvREFCNT(TOPs) == 1
2518 && !SvMAGICAL(TOPs)) {
767eda44 2519 *MARK = TOPs;
767eda44 2520 }
cd06dffe 2521 else
767eda44 2522 *MARK = sv_mortalcopy(TOPs);
cd06dffe
GS
2523 }
2524 else {
f86702cc 2525 MEXTEND(MARK, 0);
3280af22 2526 *MARK = &PL_sv_undef;
a0d0e21e
LW
2527 }
2528 SP = MARK;
2529 }
54310121 2530 else if (gimme == G_ARRAY) {
f86702cc 2531 for (MARK = newsp + 1; MARK <= SP; MARK++) {
6f48390a
FC
2532 if (!SvTEMP(*MARK) || SvREFCNT(*MARK) != 1
2533 || SvMAGICAL(*MARK)) {
f86702cc 2534 *MARK = sv_mortalcopy(*MARK);
a1f49e72
CS
2535 TAINT_NOT; /* Each item is independent */
2536 }
f86702cc 2537 }
a0d0e21e 2538 }
f86702cc 2539 PUTBACK;
1c846c1f 2540
a57c6685 2541 LEAVE;
5dd42e15 2542 cxstack_ix--;
b0d9ce38 2543 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
3280af22 2544 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e 2545
b0d9ce38 2546 LEAVESUB(sv);
f39bc417 2547 return cx->blk_sub.retop;
a0d0e21e
LW
2548}
2549
2550PP(pp_entersub)
2551{
27da23d5 2552 dVAR; dSP; dPOPss;
a0d0e21e 2553 GV *gv;
eb578fdb
KW
2554 CV *cv;
2555 PERL_CONTEXT *cx;
5d94fbed 2556 I32 gimme;
a9c4fd4e 2557 const bool hasargs = (PL_op->op_flags & OPf_STACKED) != 0;
a0d0e21e
LW
2558
2559 if (!sv)
cea2e8a9 2560 DIE(aTHX_ "Not a CODE reference");
a0d0e21e 2561 switch (SvTYPE(sv)) {
f1025168
NC
2562 /* This is overwhelming the most common case: */
2563 case SVt_PVGV:
13be902c 2564 we_have_a_glob:
159b6efe 2565 if (!(cv = GvCVu((const GV *)sv))) {
f730a42d 2566 HV *stash;
f2c0649b 2567 cv = sv_2cv(sv, &stash, &gv, 0);
f730a42d 2568 }
f1025168 2569 if (!cv) {
a57c6685 2570 ENTER;
f1025168
NC
2571 SAVETMPS;
2572 goto try_autoload;
2573 }
2574 break;
13be902c
FC
2575 case SVt_PVLV:
2576 if(isGV_with_GP(sv)) goto we_have_a_glob;
2577 /*FALLTHROUGH*/
a0d0e21e 2578 default:
7c75014e
DM
2579 if (sv == &PL_sv_yes) { /* unfound import, ignore */
2580 if (hasargs)
2581 SP = PL_stack_base + POPMARK;
4d198de3
DM
2582 else
2583 (void)POPMARK;
7c75014e
DM
2584 RETURN;
2585 }
2586 SvGETMAGIC(sv);
2587 if (SvROK(sv)) {
93d7320b
DM
2588 if (SvAMAGIC(sv)) {
2589 sv = amagic_deref_call(sv, to_cv_amg);
2590 /* Don't SPAGAIN here. */
2591 }
7c75014e
DM
2592 }
2593 else {
a9c4fd4e 2594 const char *sym;
780a5241 2595 STRLEN len;
79a3e5ea 2596 if (!SvOK(sv))
cea2e8a9 2597 DIE(aTHX_ PL_no_usym, "a subroutine");
79a3e5ea 2598 sym = SvPV_nomg_const(sv, len);
533c011a 2599 if (PL_op->op_private & HINT_STRICT_REFS)
b375e37b 2600 DIE(aTHX_ "Can't use string (\"%" SVf32 "\"%s) as a subroutine ref while \"strict refs\" in use", sv, len>32 ? "..." : "");
780a5241 2601 cv = get_cvn_flags(sym, len, GV_ADD|SvUTF8(sv));
a0d0e21e
LW
2602 break;
2603 }
ea726b52 2604 cv = MUTABLE_CV(SvRV(sv));
a0d0e21e
LW
2605 if (SvTYPE(cv) == SVt_PVCV)
2606 break;
2607 /* FALL THROUGH */
2608 case SVt_PVHV:
2609 case SVt_PVAV:
cea2e8a9 2610 DIE(aTHX_ "Not a CODE reference");
f1025168 2611 /* This is the second most common case: */
a0d0e21e 2612 case SVt_PVCV:
ea726b52 2613 cv = MUTABLE_CV(sv);
a0d0e21e 2614 break;
a0d0e21e
LW
2615 }
2616
a57c6685 2617 ENTER;
a0d0e21e
LW
2618 SAVETMPS;
2619
2620 retry:
541ed3a9
FC
2621 if (CvCLONE(cv) && ! CvCLONED(cv))
2622 DIE(aTHX_ "Closure prototype called");
a0d0e21e 2623 if (!CvROOT(cv) && !CvXSUB(cv)) {
2f349aa0
NC
2624 GV* autogv;
2625 SV* sub_name;
2626
2627 /* anonymous or undef'd function leaves us no recourse */
2628 if (CvANON(cv) || !(gv = CvGV(cv)))
2629 DIE(aTHX_ "Undefined subroutine called");
2630
2631 /* autoloaded stub? */
2632 if (cv != GvCV(gv)) {
2633 cv = GvCV(gv);
2634 }
2635 /* should call AUTOLOAD now? */
2636 else {
7e623da3 2637try_autoload:
d1089224
BF
2638 if ((autogv = gv_autoload_pvn(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv),
2639 GvNAMEUTF8(gv) ? SVf_UTF8 : 0)))
2f349aa0
NC
2640 {
2641 cv = GvCV(autogv);
2642 }
2f349aa0 2643 else {
c220e1a1 2644 sorry:
2f349aa0 2645 sub_name = sv_newmortal();
6136c704 2646 gv_efullname3(sub_name, gv, NULL);
be2597df 2647 DIE(aTHX_ "Undefined subroutine &%"SVf" called", SVfARG(sub_name));
2f349aa0
NC
2648 }
2649 }
2650 if (!cv)
c220e1a1 2651 goto sorry;
2f349aa0 2652 goto retry;
a0d0e21e
LW
2653 }
2654
54310121 2655 gimme = GIMME_V;
67caa1fe 2656 if ((PL_op->op_private & OPpENTERSUB_DB) && GvCV(PL_DBsub) && !CvNODEBUG(cv)) {
005a8a35 2657 Perl_get_db_sub(aTHX_ &sv, cv);
a9ef256d
NC
2658 if (CvISXSUB(cv))
2659 PL_curcopdb = PL_curcop;
1ad62f64 2660 if (CvLVALUE(cv)) {
2661 /* check for lsub that handles lvalue subroutines */
ae5c1e95 2662 cv = GvCV(gv_HVadd(gv_fetchpvs("DB::lsub", GV_ADDMULTI, SVt_PVHV)));
1ad62f64 2663 /* if lsub not found then fall back to DB::sub */
2664 if (!cv) cv = GvCV(PL_DBsub);
2665 } else {
2666 cv = GvCV(PL_DBsub);
2667 }
a9ef256d 2668
ccafdc96
RGS
2669 if (!cv || (!CvXSUB(cv) && !CvSTART(cv)))
2670 DIE(aTHX_ "No DB::sub routine defined");
67caa1fe 2671 }
a0d0e21e 2672
aed2304a 2673 if (!(CvISXSUB(cv))) {
f1025168 2674 /* This path taken at least 75% of the time */
a0d0e21e 2675 dMARK;
eb578fdb 2676 I32 items = SP - MARK;
b70d5558 2677 PADLIST * const padlist = CvPADLIST(cv);
a0d0e21e
LW
2678 PUSHBLOCK(cx, CXt_SUB, MARK);
2679 PUSHSUB(cx);
f39bc417 2680 cx->blk_sub.retop = PL_op->op_next;
a0d0e21e 2681 CvDEPTH(cv)++;
3a76ca88
RGS
2682 if (CvDEPTH(cv) >= 2) {
2683 PERL_STACK_OVERFLOW_CHECK();
2684 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2685 }
3a76ca88
RGS
2686 SAVECOMPPAD();
2687 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
2688 if (hasargs) {
10533ace 2689 AV *const av = MUTABLE_AV(PAD_SVl(0));
221373f0
GS
2690 if (AvREAL(av)) {
2691 /* @_ is normally not REAL--this should only ever
2692 * happen when DB::sub() calls things that modify @_ */
2693 av_clear(av);
2694 AvREAL_off(av);
2695 AvREIFY_on(av);
2696 }
3280af22 2697 cx->blk_sub.savearray = GvAV(PL_defgv);
502c6561 2698 GvAV(PL_defgv) = MUTABLE_AV(SvREFCNT_inc_simple(av));
dd2155a4 2699 CX_CURPAD_SAVE(cx->blk_sub);
6d4ff0d2 2700 cx->blk_sub.argarray = av;
a0d0e21e
LW
2701 ++MARK;
2702
2703 if (items > AvMAX(av) + 1) {
504618e9 2704 SV **ary = AvALLOC(av);
a0d0e21e
LW
2705 if (AvARRAY(av) != ary) {
2706 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
9c6bc640 2707 AvARRAY(av) = ary;
a0d0e21e
LW
2708 }
2709 if (items > AvMAX(av) + 1) {
2710 AvMAX(av) = items - 1;
2711 Renew(ary,items,SV*);
2712 AvALLOC(av) = ary;
9c6bc640 2713 AvARRAY(av) = ary;
a0d0e21e
LW
2714 }
2715 }
2716 Copy(MARK,AvARRAY(av),items,SV*);
93965878 2717 AvFILLp(av) = items - 1;
1c846c1f 2718
a0d0e21e
LW
2719 while (items--) {
2720 if (*MARK)
2721 SvTEMP_off(*MARK);
2722 MARK++;
2723 }
2724 }
da1dff94
FC
2725 if ((cx->blk_u16 & OPpENTERSUB_LVAL_MASK) == OPpLVAL_INTRO &&
2726 !CvLVALUE(cv))
2727 DIE(aTHX_ "Can't modify non-lvalue subroutine call");
4a925ff6
GS
2728 /* warning must come *after* we fully set up the context
2729 * stuff so that __WARN__ handlers can safely dounwind()
2730 * if they want to
2731 */
2b9dff67 2732 if (CvDEPTH(cv) == PERL_SUB_DEPTH_WARN && ckWARN(WARN_RECURSION)
4a925ff6
GS
2733 && !(PERLDB_SUB && cv == GvCV(PL_DBsub)))
2734 sub_crush_depth(cv);
a0d0e21e
LW
2735 RETURNOP(CvSTART(cv));
2736 }
f1025168 2737 else {
3a76ca88 2738 I32 markix = TOPMARK;
f1025168 2739
3a76ca88 2740 PUTBACK;
f1025168 2741
3a76ca88
RGS
2742 if (!hasargs) {
2743 /* Need to copy @_ to stack. Alternative may be to
2744 * switch stack to @_, and copy return values
2745 * back. This would allow popping @_ in XSUB, e.g.. XXXX */
2746 AV * const av = GvAV(PL_defgv);
2747 const I32 items = AvFILLp(av) + 1; /* @_ is not tieable */
2748
2749 if (items) {
2750 /* Mark is at the end of the stack. */
2751 EXTEND(SP, items);
2752 Copy(AvARRAY(av), SP + 1, items, SV*);
2753 SP += items;
2754 PUTBACK ;
2755 }
2756 }
2757 /* We assume first XSUB in &DB::sub is the called one. */
2758 if (PL_curcopdb) {
2759 SAVEVPTR(PL_curcop);
2760 PL_curcop = PL_curcopdb;
2761 PL_curcopdb = NULL;
2762 }
2763 /* Do we need to open block here? XXXX */
72df79cf 2764
2765 /* CvXSUB(cv) must not be NULL because newXS() refuses NULL xsub address */
2766 assert(CvXSUB(cv));
16c91539 2767 CvXSUB(cv)(aTHX_ cv);
3a76ca88
RGS
2768
2769 /* Enforce some sanity in scalar context. */
2770 if (gimme == G_SCALAR && ++markix != PL_stack_sp - PL_stack_base ) {
2771 if (markix > PL_stack_sp - PL_stack_base)
2772 *(PL_stack_base + markix) = &PL_sv_undef;
2773 else
2774 *(PL_stack_base + markix) = *PL_stack_sp;
2775 PL_stack_sp = PL_stack_base + markix;
2776 }
a57c6685 2777 LEAVE;
f1025168
NC
2778 return NORMAL;
2779 }
a0d0e21e
LW
2780}
2781
44a8e56a 2782void
864dbfa3 2783Perl_sub_crush_depth(pTHX_ CV *cv)
44a8e56a 2784{
7918f24d
NC
2785 PERL_ARGS_ASSERT_SUB_CRUSH_DEPTH;
2786
44a8e56a 2787 if (CvANON(cv))
9014280d 2788 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on anonymous subroutine");
44a8e56a 2789 else {
aec46f14 2790 SV* const tmpstr = sv_newmortal();
6136c704 2791 gv_efullname3(tmpstr, CvGV(cv), NULL);
35c1215d 2792 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on subroutine \"%"SVf"\"",
be2597df 2793 SVfARG(tmpstr));
44a8e56a
PP
2794 }
2795}
2796
a0d0e21e
LW
2797PP(pp_aelem)
2798{
97aff369 2799 dVAR; dSP;
a0d0e21e 2800 SV** svp;
a3b680e6 2801 SV* const elemsv = POPs;
d804643f 2802 IV elem = SvIV(elemsv);
502c6561 2803 AV *const av = MUTABLE_AV(POPs);
e1ec3a88
AL
2804 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
2805 const U32 defer = (PL_op->op_private & OPpLVAL_DEFER) && (elem > av_len(av));
4ad10a0b
VP
2806 const bool localizing = PL_op->op_private & OPpLVAL_INTRO;
2807 bool preeminent = TRUE;
be6c24e0 2808 SV *sv;
a0d0e21e 2809
e35c1634 2810 if (SvROK(elemsv) && !SvGAMAGIC(elemsv) && ckWARN(WARN_MISC))
95b63a38
JH
2811 Perl_warner(aTHX_ packWARN(WARN_MISC),
2812 "Use of reference \"%"SVf"\" as array index",
be2597df 2813 SVfARG(elemsv));
a0d0e21e
LW
2814 if (SvTYPE(av) != SVt_PVAV)
2815 RETPUSHUNDEF;
4ad10a0b
VP
2816
2817 if (localizing) {
2818 MAGIC *mg;
2819 HV *stash;
2820
2821 /* If we can determine whether the element exist,
2822 * Try to preserve the existenceness of a tied array
2823 * element by using EXISTS and DELETE if possible.
2824 * Fallback to FETCH and STORE otherwise. */
2825 if (SvCANEXISTDELETE(av))
2826 preeminent = av_exists(av, elem);
2827 }
2828
68dc0745 2829 svp = av_fetch(av, elem, lval && !defer);
a0d0e21e 2830 if (lval) {
2b573ace 2831#ifdef PERL_MALLOC_WRAP
2b573ace 2832 if (SvUOK(elemsv)) {
a9c4fd4e 2833 const UV uv = SvUV(elemsv);
2b573ace
JH
2834 elem = uv > IV_MAX ? IV_MAX : uv;
2835 }
2836 else if (SvNOK(elemsv))
2837 elem = (IV)SvNV(elemsv);
a3b680e6
AL
2838 if (elem > 0) {
2839 static const char oom_array_extend[] =
2840 "Out of memory during array extend"; /* Duplicated in av.c */
2b573ace 2841 MEM_WRAP_CHECK_1(elem,SV*,oom_array_extend);
a3b680e6 2842 }
2b573ace 2843#endif
3280af22 2844 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
2845 SV* lv;
2846 if (!defer)
cea2e8a9 2847 DIE(aTHX_ PL_no_aelem, elem);
68dc0745
PP
2848 lv = sv_newmortal();
2849 sv_upgrade(lv, SVt_PVLV);
2850 LvTYPE(lv) = 'y';
a0714e2c 2851 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
b37c2d43 2852 LvTARG(lv) = SvREFCNT_inc_simple(av);
68dc0745
PP
2853 LvTARGOFF(lv) = elem;
2854 LvTARGLEN(lv) = 1;
2855 PUSHs(lv);
2856 RETURN;
2857 }
4ad10a0b
VP
2858 if (localizing) {
2859 if (preeminent)
2860 save_aelem(av, elem, svp);
2861 else
2862 SAVEADELETE(av, elem);
2863 }
9026059d
GG
2864 else if (PL_op->op_private & OPpDEREF) {
2865 PUSHs(vivify_ref(*svp, PL_op->op_private & OPpDEREF));
2866 RETURN;
2867 }
a0d0e21e 2868 }
3280af22 2869 sv = (svp ? *svp : &PL_sv_undef);
39cf747a 2870 if (!lval && SvRMAGICAL(av) && SvGMAGICAL(sv)) /* see note in pp_helem() */
fd69380d 2871 mg_get(sv);
be6c24e0 2872 PUSHs(sv);
a0d0e21e
LW
2873 RETURN;
2874}
2875
9026059d 2876SV*
864dbfa3 2877Perl_vivify_ref(pTHX_ SV *sv, U32 to_what)
02a9e968 2878{
7918f24d
NC
2879 PERL_ARGS_ASSERT_VIVIFY_REF;
2880
5b295bef 2881 SvGETMAGIC(sv);
02a9e968
CS
2882 if (!SvOK(sv)) {
2883 if (SvREADONLY(sv))
6ad8f254 2884 Perl_croak_no_modify(aTHX);
43230e26 2885 prepare_SV_for_RV(sv);
68dc0745 2886 switch (to_what) {
5f05dabc 2887 case OPpDEREF_SV:
561b68a9 2888 SvRV_set(sv, newSV(0));
5f05dabc
PP
2889 break;
2890 case OPpDEREF_AV:
ad64d0ec 2891 SvRV_set(sv, MUTABLE_SV(newAV()));
5f05dabc
PP
2892 break;
2893 case OPpDEREF_HV:
ad64d0ec 2894 SvRV_set(sv, MUTABLE_SV(newHV()));
5f05dabc
PP
2895 break;
2896 }
02a9e968
CS
2897 SvROK_on(sv);
2898 SvSETMAGIC(sv);
7e482323 2899 SvGETMAGIC(sv);
02a9e968 2900 }
9026059d
GG
2901 if (SvGMAGICAL(sv)) {
2902 /* copy the sv without magic to prevent magic from being
2903 executed twice */
2904 SV* msv = sv_newmortal();
2905 sv_setsv_nomg(msv, sv);
2906 return msv;
2907 }
2908 return sv;
02a9e968
CS
2909}
2910
a0d0e21e
LW
2911PP(pp_method)
2912{
97aff369 2913 dVAR; dSP;
890ce7af 2914 SV* const sv = TOPs;
f5d5a27c
CS
2915
2916 if (SvROK(sv)) {
890ce7af 2917 SV* const rsv = SvRV(sv);
f5d5a27c
CS
2918 if (SvTYPE(rsv) == SVt_PVCV) {
2919 SETs(rsv);
2920 RETURN;
2921 }
2922 }
2923
4608196e 2924 SETs(method_common(sv, NULL));
f5d5a27c
CS
2925 RETURN;
2926}
2927
2928PP(pp_method_named)
2929{
97aff369 2930 dVAR; dSP;
890ce7af 2931 SV* const sv = cSVOP_sv;
c158a4fd 2932 U32 hash = SvSHARED_HASH(sv);
f5d5a27c
CS
2933
2934 XPUSHs(method_common(sv, &hash));
2935 RETURN;
2936}
2937
2938STATIC SV *
2939S_method_common(pTHX_ SV* meth, U32* hashp)
2940{
97aff369 2941 dVAR;
a0d0e21e
LW
2942 SV* ob;
2943 GV* gv;
56304f61 2944 HV* stash;
a0714e2c 2945 SV *packsv = NULL;
f226e9be
FC
2946 SV * const sv = PL_stack_base + TOPMARK == PL_stack_sp
2947 ? (Perl_croak(aTHX_ "Can't call method \"%"SVf"\" without a "
2948 "package or object reference", SVfARG(meth)),
2949 (SV *)NULL)
2950 : *(PL_stack_base + TOPMARK + 1);
f5d5a27c 2951
7918f24d
NC
2952 PERL_ARGS_ASSERT_METHOD_COMMON;
2953
4f1b7578 2954 if (!sv)
a214957f
VP
2955 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" on an undefined value",
2956 SVfARG(meth));
4f1b7578 2957
5b295bef 2958 SvGETMAGIC(sv);
a0d0e21e 2959 if (SvROK(sv))
ad64d0ec 2960 ob = MUTABLE_SV(SvRV(sv));
a0d0e21e
LW
2961 else {
2962 GV* iogv;
f937af42
BF
2963 STRLEN packlen;
2964 const char * packname = NULL;
da6b625f 2965 bool packname_is_utf8 = FALSE;
a0d0e21e 2966
af09ea45 2967 /* this isn't a reference */
da6b625f
FC
2968 if(SvOK(sv) && (packname = SvPV_nomg_const(sv, packlen))) {
2969 const HE* const he =
2970 (const HE *)hv_common_key_len(
2971 PL_stashcache, packname,
2972 packlen * -(packname_is_utf8 = !!SvUTF8(sv)), 0, NULL, 0
2973 );
2974
081fc587 2975 if (he) {
5e6396ae 2976 stash = INT2PTR(HV*,SvIV(HeVAL(he)));
081fc587
AB
2977 goto fetch;
2978 }
2979 }
2980
a0d0e21e 2981 if (!SvOK(sv) ||
05f5af9a 2982 !(packname) ||
da6b625f
FC
2983 !(iogv = gv_fetchpvn_flags(
2984 packname, packlen, SVf_UTF8 * packname_is_utf8, SVt_PVIO
2985 )) ||
ad64d0ec 2986 !(ob=MUTABLE_SV(GvIO(iogv))))
a0d0e21e 2987 {
af09ea45 2988 /* this isn't the name of a filehandle either */
1c846c1f 2989 if (!packname ||
fd400ab9 2990 ((UTF8_IS_START(*packname) && DO_UTF8(sv))
b86a2fa7 2991 ? !isIDFIRST_utf8((U8*)packname)
d47f310d 2992 : !isIDFIRST_L1((U8)*packname)
834a4ddd
LW
2993 ))
2994 {
d5e45555 2995 /* diag_listed_as: Can't call method "%s" without a package or object reference */
a214957f
VP
2996 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" %s",
2997 SVfARG(meth),
f5d5a27c
CS
2998 SvOK(sv) ? "without a package or object reference"
2999 : "on an undefined value");
834a4ddd 3000 }
af09ea45 3001 /* assume it's a package name */
f937af42 3002 stash = gv_stashpvn(packname, packlen, packname_is_utf8 ? SVf_UTF8 : 0);
0dae17bd
GS
3003 if (!stash)
3004 packsv = sv;
081fc587 3005 else {
d4c19fe8 3006 SV* const ref = newSViv(PTR2IV(stash));
f937af42 3007 (void)hv_store(PL_stashcache, packname,
c60dbbc3 3008 packname_is_utf8 ? -(I32)packlen : (I32)packlen, ref, 0);
7e8961ec 3009 }
ac91690f 3010 goto fetch;
a0d0e21e 3011 }
af09ea45 3012 /* it _is_ a filehandle name -- replace with a reference */
ad64d0ec 3013 *(PL_stack_base + TOPMARK + 1) = sv_2mortal(newRV(MUTABLE_SV(iogv)));
a0d0e21e
LW
3014 }
3015
af09ea45 3016 /* if we got here, ob should be a reference or a glob */
f0d43078 3017 if (!ob || !(SvOBJECT(ob)
6e592b3a
BM
3018 || (SvTYPE(ob) == SVt_PVGV
3019 && isGV_with_GP(ob)
159b6efe 3020 && (ob = MUTABLE_SV(GvIO((const GV *)ob)))
f0d43078
GS
3021 && SvOBJECT(ob))))
3022 {
b375e37b
BF
3023 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" on unblessed reference",
3024 SVfARG((SvSCREAM(meth) && strEQ(SvPV_nolen_const(meth),"isa"))
3025 ? newSVpvs_flags("DOES", SVs_TEMP)
3026 : meth));
f0d43078 3027 }
a0d0e21e 3028
56304f61 3029 stash = SvSTASH(ob);
a0d0e21e 3030
ac91690f 3031 fetch:
af09ea45
IK
3032 /* NOTE: stash may be null, hope hv_fetch_ent and
3033 gv_fetchmethod can cope (it seems they can) */
3034
f5d5a27c
CS
3035 /* shortcut for simple names */
3036 if (hashp) {
b464bac0 3037 const HE* const he = hv_fetch_ent(stash, meth, 0, *hashp);
f5d5a27c 3038 if (he) {
159b6efe 3039 gv = MUTABLE_GV(HeVAL(he));
f5d5a27c 3040 if (isGV(gv) && GvCV(gv) &&
e1a479c5 3041 (!GvCVGEN(gv) || GvCVGEN(gv)
dd69841b 3042 == (PL_sub_generation + HvMROMETA(stash)->cache_gen)))
ad64d0ec 3043 return MUTABLE_SV(GvCV(gv));
f5d5a27c
CS
3044 }
3045 }
3046
f937af42
BF
3047 gv = gv_fetchmethod_sv_flags(stash ? stash : MUTABLE_HV(packsv),
3048 meth, GV_AUTOLOAD | GV_CROAK);
9b9d0b15 3049
256d1bb2 3050 assert(gv);
9b9d0b15 3051
ad64d0ec 3052 return isGV(gv) ? MUTABLE_SV(GvCV(gv)) : MUTABLE_SV(gv);
a0d0e21e 3053}
241d1a3b
NC
3054
3055/*
3056 * Local variables:
3057 * c-indentation-style: bsd
3058 * c-basic-offset: 4
14d04a33 3059 * indent-tabs-mode: nil
241d1a3b
NC
3060 * End:
3061 *
14d04a33 3062 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3063 */