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[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
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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"]
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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
bf0571fd 77/* This is sometimes called directly by pp_coreargs. */
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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{
97aff369 115 dVAR; dSP; dPOPTOPssrl;
748a9306 116
533c011a 117 if (PL_op->op_private & OPpASSIGN_BACKWARDS) {
0bd48802
AL
118 SV * const temp = left;
119 left = right; right = temp;
a0d0e21e 120 }
3280af22 121 if (PL_tainting && PL_tainted && !SvTAINTED(left))
a0d0e21e 122 TAINT_NOT;
e26df76a 123 if (PL_op->op_private & OPpASSIGN_CV_TO_GV) {
6136c704 124 SV * const cv = SvRV(left);
e26df76a 125 const U32 cv_type = SvTYPE(cv);
13be902c 126 const bool is_gv = isGV_with_GP(right);
6136c704 127 const bool got_coderef = cv_type == SVt_PVCV || cv_type == SVt_PVFM;
e26df76a
NC
128
129 if (!got_coderef) {
130 assert(SvROK(cv));
131 }
132
ae6d515f 133 /* Can do the optimisation if right (LVALUE) is not a typeglob,
e26df76a
NC
134 left (RVALUE) is a reference to something, and we're in void
135 context. */
13be902c 136 if (!got_coderef && !is_gv && GIMME_V == G_VOID) {
e26df76a 137 /* Is the target symbol table currently empty? */
77cb3b01 138 GV * const gv = gv_fetchsv_nomg(right, GV_NOINIT, SVt_PVGV);
bb112e5a 139 if (SvTYPE(gv) != SVt_PVGV && !SvOK(gv)) {
e26df76a
NC
140 /* Good. Create a new proxy constant subroutine in the target.
141 The gv becomes a(nother) reference to the constant. */
142 SV *const value = SvRV(cv);
143
ad64d0ec 144 SvUPGRADE(MUTABLE_SV(gv), SVt_IV);
1ccdb730 145 SvPCS_IMPORTED_on(gv);
e26df76a 146 SvRV_set(gv, value);
b37c2d43 147 SvREFCNT_inc_simple_void(value);
e26df76a
NC
148 SETs(right);
149 RETURN;
150 }
151 }
152
153 /* Need to fix things up. */
13be902c 154 if (!is_gv) {
e26df76a 155 /* Need to fix GV. */
77cb3b01 156 right = MUTABLE_SV(gv_fetchsv_nomg(right,GV_ADD, SVt_PVGV));
e26df76a
NC
157 }
158
159 if (!got_coderef) {
160 /* We've been returned a constant rather than a full subroutine,
161 but they expect a subroutine reference to apply. */
53a42478 162 if (SvROK(cv)) {
d343c3ef 163 ENTER_with_name("sassign_coderef");
53a42478
NC
164 SvREFCNT_inc_void(SvRV(cv));
165 /* newCONSTSUB takes a reference count on the passed in SV
166 from us. We set the name to NULL, otherwise we get into
167 all sorts of fun as the reference to our new sub is
168 donated to the GV that we're about to assign to.
169 */
ad64d0ec
NC
170 SvRV_set(left, MUTABLE_SV(newCONSTSUB(GvSTASH(right), NULL,
171 SvRV(cv))));
53a42478 172 SvREFCNT_dec(cv);
d343c3ef 173 LEAVE_with_name("sassign_coderef");
53a42478
NC
174 } else {
175 /* What can happen for the corner case *{"BONK"} = \&{"BONK"};
176 is that
177 First: ops for \&{"BONK"}; return us the constant in the
178 symbol table
179 Second: ops for *{"BONK"} cause that symbol table entry
180 (and our reference to it) to be upgraded from RV
181 to typeblob)
182 Thirdly: We get here. cv is actually PVGV now, and its
183 GvCV() is actually the subroutine we're looking for
184
185 So change the reference so that it points to the subroutine
186 of that typeglob, as that's what they were after all along.
187 */
159b6efe 188 GV *const upgraded = MUTABLE_GV(cv);
53a42478
NC
189 CV *const source = GvCV(upgraded);
190
191 assert(source);
192 assert(CvFLAGS(source) & CVf_CONST);
193
194 SvREFCNT_inc_void(source);
195 SvREFCNT_dec(upgraded);
ad64d0ec 196 SvRV_set(left, MUTABLE_SV(source));
53a42478 197 }
e26df76a 198 }
53a42478 199
e26df76a 200 }
8fe85e3f
FC
201 if (
202 SvTEMP(right) && !SvSMAGICAL(right) && SvREFCNT(right) == 1 &&
203 (!isGV_with_GP(right) || SvFAKE(right)) && ckWARN(WARN_MISC)
204 )
205 Perl_warner(aTHX_
206 packWARN(WARN_MISC), "Useless assignment to a temporary"
207 );
54310121 208 SvSetMagicSV(right, left);
a0d0e21e
LW
209 SETs(right);
210 RETURN;
211}
212
213PP(pp_cond_expr)
214{
97aff369 215 dVAR; dSP;
f410a211 216 PERL_ASYNC_CHECK();
a0d0e21e 217 if (SvTRUEx(POPs))
1a67a97c 218 RETURNOP(cLOGOP->op_other);
a0d0e21e 219 else
1a67a97c 220 RETURNOP(cLOGOP->op_next);
a0d0e21e
LW
221}
222
223PP(pp_unstack)
224{
97aff369 225 dVAR;
8f3964af 226 PERL_ASYNC_CHECK();
a0d0e21e 227 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 228 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e 229 FREETMPS;
eae48c89
Z
230 if (!(PL_op->op_flags & OPf_SPECIAL)) {
231 I32 oldsave = PL_scopestack[PL_scopestack_ix - 1];
232 LEAVE_SCOPE(oldsave);
233 }
a0d0e21e
LW
234 return NORMAL;
235}
236
a0d0e21e
LW
237PP(pp_concat)
238{
6f1401dc 239 dVAR; dSP; dATARGET; tryAMAGICbin_MG(concat_amg, AMGf_assign);
748a9306
LW
240 {
241 dPOPTOPssrl;
8d6d96c1
HS
242 bool lbyte;
243 STRLEN rlen;
d4c19fe8 244 const char *rpv = NULL;
a6b599c7 245 bool rbyte = FALSE;
a9c4fd4e 246 bool rcopied = FALSE;
8d6d96c1 247
6f1401dc
DM
248 if (TARG == right && right != left) { /* $r = $l.$r */
249 rpv = SvPV_nomg_const(right, rlen);
c75ab21a 250 rbyte = !DO_UTF8(right);
59cd0e26 251 right = newSVpvn_flags(rpv, rlen, SVs_TEMP);
349d4f2f 252 rpv = SvPV_const(right, rlen); /* no point setting UTF-8 here */
db79b45b 253 rcopied = TRUE;
8d6d96c1 254 }
7889fe52 255
89734059 256 if (TARG != left) { /* not $l .= $r */
a9c4fd4e 257 STRLEN llen;
6f1401dc 258 const char* const lpv = SvPV_nomg_const(left, llen);
90f5826e 259 lbyte = !DO_UTF8(left);
8d6d96c1
HS
260 sv_setpvn(TARG, lpv, llen);
261 if (!lbyte)
262 SvUTF8_on(TARG);
263 else
264 SvUTF8_off(TARG);
265 }
89734059 266 else { /* $l .= $r */
c75ab21a 267 if (!SvOK(TARG)) {
89734059 268 if (left == right && ckWARN(WARN_UNINITIALIZED)) /* $l .= $l */
c75ab21a 269 report_uninit(right);
76f68e9b 270 sv_setpvs(left, "");
c75ab21a 271 }
c5aa2872
DM
272 lbyte = (SvROK(left) && SvTYPE(SvRV(left)) == SVt_REGEXP)
273 ? !DO_UTF8(SvRV(left)) : !DO_UTF8(left);
90f5826e
ST
274 if (IN_BYTES)
275 SvUTF8_off(TARG);
8d6d96c1 276 }
a12c0f56 277
c75ab21a 278 if (!rcopied) {
6f1401dc 279 if (left == right)
89734059 280 /* $r.$r: do magic twice: tied might return different 2nd time */
6f1401dc
DM
281 SvGETMAGIC(right);
282 rpv = SvPV_nomg_const(right, rlen);
c75ab21a
RH
283 rbyte = !DO_UTF8(right);
284 }
8d6d96c1 285 if (lbyte != rbyte) {
e3393f51
NT
286 /* sv_utf8_upgrade_nomg() may reallocate the stack */
287 PUTBACK;
8d6d96c1
HS
288 if (lbyte)
289 sv_utf8_upgrade_nomg(TARG);
290 else {
db79b45b 291 if (!rcopied)
59cd0e26 292 right = newSVpvn_flags(rpv, rlen, SVs_TEMP);
8d6d96c1 293 sv_utf8_upgrade_nomg(right);
6f1401dc 294 rpv = SvPV_nomg_const(right, rlen);
69b47968 295 }
e3393f51 296 SPAGAIN;
a0d0e21e 297 }
8d6d96c1 298 sv_catpvn_nomg(TARG, rpv, rlen);
43ebc500 299
a0d0e21e
LW
300 SETTARG;
301 RETURN;
748a9306 302 }
a0d0e21e
LW
303}
304
305PP(pp_padsv)
306{
97aff369 307 dVAR; dSP; dTARGET;
a0d0e21e 308 XPUSHs(TARG);
533c011a
NIS
309 if (PL_op->op_flags & OPf_MOD) {
310 if (PL_op->op_private & OPpLVAL_INTRO)
952306ac
RGS
311 if (!(PL_op->op_private & OPpPAD_STATE))
312 SAVECLEARSV(PAD_SVl(PL_op->op_targ));
a62b51b8 313 if (PL_op->op_private & OPpDEREF) {
8ec5e241 314 PUTBACK;
9026059d 315 TOPs = vivify_ref(TOPs, PL_op->op_private & OPpDEREF);
8ec5e241
NIS
316 SPAGAIN;
317 }
4633a7c4 318 }
a0d0e21e
LW
319 RETURN;
320}
321
322PP(pp_readline)
323{
97aff369 324 dVAR;
30901a8a
FC
325 dSP;
326 if (TOPs) {
327 SvGETMAGIC(TOPs);
328 tryAMAGICunTARGET(iter_amg, 0, 0);
329 PL_last_in_gv = MUTABLE_GV(*PL_stack_sp--);
330 }
331 else PL_last_in_gv = PL_argvgv, PL_stack_sp--;
6e592b3a
BM
332 if (!isGV_with_GP(PL_last_in_gv)) {
333 if (SvROK(PL_last_in_gv) && isGV_with_GP(SvRV(PL_last_in_gv)))
159b6efe 334 PL_last_in_gv = MUTABLE_GV(SvRV(PL_last_in_gv));
8efb3254 335 else {
f5284f61 336 dSP;
ad64d0ec 337 XPUSHs(MUTABLE_SV(PL_last_in_gv));
f5284f61 338 PUTBACK;
897d3989 339 Perl_pp_rv2gv(aTHX);
159b6efe 340 PL_last_in_gv = MUTABLE_GV(*PL_stack_sp--);
f5284f61
IZ
341 }
342 }
a0d0e21e
LW
343 return do_readline();
344}
345
346PP(pp_eq)
347{
6f1401dc 348 dVAR; dSP;
33efebe6
DM
349 SV *left, *right;
350
a42d0242 351 tryAMAGICbin_MG(eq_amg, AMGf_set|AMGf_numeric);
33efebe6
DM
352 right = POPs;
353 left = TOPs;
354 SETs(boolSV(
355 (SvIOK_notUV(left) && SvIOK_notUV(right))
356 ? (SvIVX(left) == SvIVX(right))
357 : ( do_ncmp(left, right) == 0)
358 ));
359 RETURN;
a0d0e21e
LW
360}
361
362PP(pp_preinc)
363{
97aff369 364 dVAR; dSP;
17058fe0
FC
365 const bool inc =
366 PL_op->op_type == OP_PREINC || PL_op->op_type == OP_I_PREINC;
60092ce4 367 if (SvTYPE(TOPs) >= SVt_PVAV || (isGV_with_GP(TOPs) && !SvFAKE(TOPs)))
6ad8f254 368 Perl_croak_no_modify(aTHX);
3510b4a1 369 if (!SvREADONLY(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
17058fe0 370 && SvIVX(TOPs) != (inc ? IV_MAX : IV_MIN))
55497cff 371 {
17058fe0 372 SvIV_set(TOPs, SvIVX(TOPs) + (inc ? 1 : -1));
55497cff 373 SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
748a9306 374 }
28e5dec8 375 else /* Do all the PERL_PRESERVE_IVUV conditionals in sv_inc */
17058fe0
FC
376 if (inc) sv_inc(TOPs);
377 else sv_dec(TOPs);
a0d0e21e
LW
378 SvSETMAGIC(TOPs);
379 return NORMAL;
380}
381
382PP(pp_or)
383{
97aff369 384 dVAR; dSP;
f410a211 385 PERL_ASYNC_CHECK();
a0d0e21e
LW
386 if (SvTRUE(TOPs))
387 RETURN;
388 else {
c960fc3b
SP
389 if (PL_op->op_type == OP_OR)
390 --SP;
a0d0e21e
LW
391 RETURNOP(cLOGOP->op_other);
392 }
393}
394
25a55bd7 395PP(pp_defined)
c963b151 396{
97aff369 397 dVAR; dSP;
6136c704
AL
398 register SV* sv;
399 bool defined;
25a55bd7 400 const int op_type = PL_op->op_type;
ea5195b7 401 const bool is_dor = (op_type == OP_DOR || op_type == OP_DORASSIGN);
c963b151 402
6136c704 403 if (is_dor) {
f410a211 404 PERL_ASYNC_CHECK();
25a55bd7
SP
405 sv = TOPs;
406 if (!sv || !SvANY(sv)) {
2bd49cfc
NC
407 if (op_type == OP_DOR)
408 --SP;
25a55bd7
SP
409 RETURNOP(cLOGOP->op_other);
410 }
b7c44293
RGS
411 }
412 else {
413 /* OP_DEFINED */
25a55bd7
SP
414 sv = POPs;
415 if (!sv || !SvANY(sv))
416 RETPUSHNO;
b7c44293 417 }
25a55bd7 418
6136c704 419 defined = FALSE;
c963b151
BD
420 switch (SvTYPE(sv)) {
421 case SVt_PVAV:
422 if (AvMAX(sv) >= 0 || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 423 defined = TRUE;
c963b151
BD
424 break;
425 case SVt_PVHV:
426 if (HvARRAY(sv) || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 427 defined = TRUE;
c963b151
BD
428 break;
429 case SVt_PVCV:
430 if (CvROOT(sv) || CvXSUB(sv))
25a55bd7 431 defined = TRUE;
c963b151
BD
432 break;
433 default:
5b295bef 434 SvGETMAGIC(sv);
c963b151 435 if (SvOK(sv))
25a55bd7 436 defined = TRUE;
6136c704 437 break;
c963b151 438 }
6136c704
AL
439
440 if (is_dor) {
c960fc3b
SP
441 if(defined)
442 RETURN;
443 if(op_type == OP_DOR)
444 --SP;
25a55bd7 445 RETURNOP(cLOGOP->op_other);
25a55bd7 446 }
d9aa96a4
SP
447 /* assuming OP_DEFINED */
448 if(defined)
449 RETPUSHYES;
450 RETPUSHNO;
c963b151
BD
451}
452
a0d0e21e
LW
453PP(pp_add)
454{
800401ee 455 dVAR; dSP; dATARGET; bool useleft; SV *svl, *svr;
6f1401dc
DM
456 tryAMAGICbin_MG(add_amg, AMGf_assign|AMGf_numeric);
457 svr = TOPs;
458 svl = TOPm1s;
459
800401ee 460 useleft = USE_LEFT(svl);
28e5dec8
JH
461#ifdef PERL_PRESERVE_IVUV
462 /* We must see if we can perform the addition with integers if possible,
463 as the integer code detects overflow while the NV code doesn't.
464 If either argument hasn't had a numeric conversion yet attempt to get
465 the IV. It's important to do this now, rather than just assuming that
466 it's not IOK as a PV of "9223372036854775806" may not take well to NV
467 addition, and an SV which is NOK, NV=6.0 ought to be coerced to
468 integer in case the second argument is IV=9223372036854775806
469 We can (now) rely on sv_2iv to do the right thing, only setting the
470 public IOK flag if the value in the NV (or PV) slot is truly integer.
471
472 A side effect is that this also aggressively prefers integer maths over
7dca457a
NC
473 fp maths for integer values.
474
a00b5bd3 475 How to detect overflow?
7dca457a
NC
476
477 C 99 section 6.2.6.1 says
478
479 The range of nonnegative values of a signed integer type is a subrange
480 of the corresponding unsigned integer type, and the representation of
481 the same value in each type is the same. A computation involving
482 unsigned operands can never overflow, because a result that cannot be
483 represented by the resulting unsigned integer type is reduced modulo
484 the number that is one greater than the largest value that can be
485 represented by the resulting type.
486
487 (the 9th paragraph)
488
489 which I read as "unsigned ints wrap."
490
491 signed integer overflow seems to be classed as "exception condition"
492
493 If an exceptional condition occurs during the evaluation of an
494 expression (that is, if the result is not mathematically defined or not
495 in the range of representable values for its type), the behavior is
496 undefined.
497
498 (6.5, the 5th paragraph)
499
500 I had assumed that on 2s complement machines signed arithmetic would
501 wrap, hence coded pp_add and pp_subtract on the assumption that
502 everything perl builds on would be happy. After much wailing and
503 gnashing of teeth it would seem that irix64 knows its ANSI spec well,
504 knows that it doesn't need to, and doesn't. Bah. Anyway, the all-
505 unsigned code below is actually shorter than the old code. :-)
506 */
507
01f91bf2 508 if (SvIV_please_nomg(svr)) {
28e5dec8
JH
509 /* Unless the left argument is integer in range we are going to have to
510 use NV maths. Hence only attempt to coerce the right argument if
511 we know the left is integer. */
9c5ffd7c
JH
512 register UV auv = 0;
513 bool auvok = FALSE;
7dca457a
NC
514 bool a_valid = 0;
515
28e5dec8 516 if (!useleft) {
7dca457a
NC
517 auv = 0;
518 a_valid = auvok = 1;
519 /* left operand is undef, treat as zero. + 0 is identity,
520 Could SETi or SETu right now, but space optimise by not adding
521 lots of code to speed up what is probably a rarish case. */
522 } else {
523 /* Left operand is defined, so is it IV? */
01f91bf2 524 if (SvIV_please_nomg(svl)) {
800401ee
JH
525 if ((auvok = SvUOK(svl)))
526 auv = SvUVX(svl);
7dca457a 527 else {
800401ee 528 register const IV aiv = SvIVX(svl);
7dca457a
NC
529 if (aiv >= 0) {
530 auv = aiv;
531 auvok = 1; /* Now acting as a sign flag. */
532 } else { /* 2s complement assumption for IV_MIN */
533 auv = (UV)-aiv;
534 }
535 }
536 a_valid = 1;
28e5dec8
JH
537 }
538 }
7dca457a
NC
539 if (a_valid) {
540 bool result_good = 0;
541 UV result;
542 register UV buv;
800401ee 543 bool buvok = SvUOK(svr);
a00b5bd3 544
7dca457a 545 if (buvok)
800401ee 546 buv = SvUVX(svr);
7dca457a 547 else {
800401ee 548 register const IV biv = SvIVX(svr);
7dca457a
NC
549 if (biv >= 0) {
550 buv = biv;
551 buvok = 1;
552 } else
553 buv = (UV)-biv;
554 }
555 /* ?uvok if value is >= 0. basically, flagged as UV if it's +ve,
602f51c4 556 else "IV" now, independent of how it came in.
7dca457a
NC
557 if a, b represents positive, A, B negative, a maps to -A etc
558 a + b => (a + b)
559 A + b => -(a - b)
560 a + B => (a - b)
561 A + B => -(a + b)
562 all UV maths. negate result if A negative.
563 add if signs same, subtract if signs differ. */
564
565 if (auvok ^ buvok) {
566 /* Signs differ. */
567 if (auv >= buv) {
568 result = auv - buv;
569 /* Must get smaller */
570 if (result <= auv)
571 result_good = 1;
572 } else {
573 result = buv - auv;
574 if (result <= buv) {
575 /* result really should be -(auv-buv). as its negation
576 of true value, need to swap our result flag */
577 auvok = !auvok;
578 result_good = 1;
28e5dec8
JH
579 }
580 }
7dca457a
NC
581 } else {
582 /* Signs same */
583 result = auv + buv;
584 if (result >= auv)
585 result_good = 1;
586 }
587 if (result_good) {
588 SP--;
589 if (auvok)
28e5dec8 590 SETu( result );
7dca457a
NC
591 else {
592 /* Negate result */
593 if (result <= (UV)IV_MIN)
594 SETi( -(IV)result );
595 else {
596 /* result valid, but out of range for IV. */
597 SETn( -(NV)result );
28e5dec8
JH
598 }
599 }
7dca457a
NC
600 RETURN;
601 } /* Overflow, drop through to NVs. */
28e5dec8
JH
602 }
603 }
604#endif
a0d0e21e 605 {
6f1401dc 606 NV value = SvNV_nomg(svr);
4efa5a16 607 (void)POPs;
28e5dec8
JH
608 if (!useleft) {
609 /* left operand is undef, treat as zero. + 0.0 is identity. */
610 SETn(value);
611 RETURN;
612 }
6f1401dc 613 SETn( value + SvNV_nomg(svl) );
28e5dec8 614 RETURN;
a0d0e21e
LW
615 }
616}
617
618PP(pp_aelemfast)
619{
97aff369 620 dVAR; dSP;
93bad3fd 621 AV * const av = PL_op->op_type == OP_AELEMFAST_LEX
8f878375 622 ? MUTABLE_AV(PAD_SV(PL_op->op_targ)) : GvAVn(cGVOP_gv);
a3b680e6 623 const U32 lval = PL_op->op_flags & OPf_MOD;
0bd48802 624 SV** const svp = av_fetch(av, PL_op->op_private, lval);
3280af22 625 SV *sv = (svp ? *svp : &PL_sv_undef);
6ff81951 626 EXTEND(SP, 1);
39cf747a 627 if (!lval && SvRMAGICAL(av) && SvGMAGICAL(sv)) /* see note in pp_helem() */
fd69380d 628 mg_get(sv);
be6c24e0 629 PUSHs(sv);
a0d0e21e
LW
630 RETURN;
631}
632
633PP(pp_join)
634{
97aff369 635 dVAR; dSP; dMARK; dTARGET;
a0d0e21e
LW
636 MARK++;
637 do_join(TARG, *MARK, MARK, SP);
638 SP = MARK;
639 SETs(TARG);
640 RETURN;
641}
642
643PP(pp_pushre)
644{
97aff369 645 dVAR; dSP;
44a8e56a
PP
646#ifdef DEBUGGING
647 /*
648 * We ass_u_me that LvTARGOFF() comes first, and that two STRLENs
649 * will be enough to hold an OP*.
650 */
c4420975 651 SV* const sv = sv_newmortal();
44a8e56a
PP
652 sv_upgrade(sv, SVt_PVLV);
653 LvTYPE(sv) = '/';
533c011a 654 Copy(&PL_op, &LvTARGOFF(sv), 1, OP*);
44a8e56a
PP
655 XPUSHs(sv);
656#else
ad64d0ec 657 XPUSHs(MUTABLE_SV(PL_op));
44a8e56a 658#endif
a0d0e21e
LW
659 RETURN;
660}
661
662/* Oversized hot code. */
663
664PP(pp_print)
665{
27da23d5 666 dVAR; dSP; dMARK; dORIGMARK;
760ac839 667 register PerlIO *fp;
236988e4 668 MAGIC *mg;
159b6efe
NC
669 GV * const gv
670 = (PL_op->op_flags & OPf_STACKED) ? MUTABLE_GV(*++MARK) : PL_defoutgv;
9c9f25b8 671 IO *io = GvIO(gv);
5b468f54 672
9c9f25b8 673 if (io
ad64d0ec 674 && (mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar)))
5b468f54 675 {
01bb7c6d 676 had_magic:
68dc0745 677 if (MARK == ORIGMARK) {
1c846c1f 678 /* If using default handle then we need to make space to
a60c0954
NIS
679 * pass object as 1st arg, so move other args up ...
680 */
4352c267 681 MEXTEND(SP, 1);
68dc0745
PP
682 ++MARK;
683 Move(MARK, MARK + 1, (SP - MARK) + 1, SV*);
684 ++SP;
685 }
94bc412f
NC
686 return Perl_tied_method(aTHX_ "PRINT", mark - 1, MUTABLE_SV(io),
687 mg,
688 (G_SCALAR | TIED_METHOD_ARGUMENTS_ON_STACK
689 | (PL_op->op_type == OP_SAY
690 ? TIED_METHOD_SAY : 0)), sp - mark);
236988e4 691 }
9c9f25b8 692 if (!io) {
68b590d9 693 if ( gv && GvEGVx(gv) && (io = GvIO(GvEGV(gv)))
ad64d0ec 694 && (mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar)))
01bb7c6d 695 goto had_magic;
51087808 696 report_evil_fh(gv);
93189314 697 SETERRNO(EBADF,RMS_IFI);
a0d0e21e
LW
698 goto just_say_no;
699 }
700 else if (!(fp = IoOFP(io))) {
7716c5c5
NC
701 if (IoIFP(io))
702 report_wrongway_fh(gv, '<');
51087808 703 else
7716c5c5 704 report_evil_fh(gv);
93189314 705 SETERRNO(EBADF,IoIFP(io)?RMS_FAC:RMS_IFI);
a0d0e21e
LW
706 goto just_say_no;
707 }
708 else {
e23d9e2f 709 SV * const ofs = GvSV(PL_ofsgv); /* $, */
a0d0e21e 710 MARK++;
e23d9e2f 711 if (ofs && (SvGMAGICAL(ofs) || SvOK(ofs))) {
a0d0e21e
LW
712 while (MARK <= SP) {
713 if (!do_print(*MARK, fp))
714 break;
715 MARK++;
716 if (MARK <= SP) {
e23d9e2f
CS
717 /* don't use 'ofs' here - it may be invalidated by magic callbacks */
718 if (!do_print(GvSV(PL_ofsgv), fp)) {
a0d0e21e
LW
719 MARK--;
720 break;
721 }
722 }
723 }
724 }
725 else {
726 while (MARK <= SP) {
727 if (!do_print(*MARK, fp))
728 break;
729 MARK++;
730 }
731 }
732 if (MARK <= SP)
733 goto just_say_no;
734 else {
cfc4a7da
GA
735 if (PL_op->op_type == OP_SAY) {
736 if (PerlIO_write(fp, "\n", 1) == 0 || PerlIO_error(fp))
737 goto just_say_no;
738 }
739 else if (PL_ors_sv && SvOK(PL_ors_sv))
7889fe52 740 if (!do_print(PL_ors_sv, fp)) /* $\ */
a0d0e21e
LW
741 goto just_say_no;
742
743 if (IoFLAGS(io) & IOf_FLUSH)
760ac839 744 if (PerlIO_flush(fp) == EOF)
a0d0e21e
LW
745 goto just_say_no;
746 }
747 }
748 SP = ORIGMARK;
e52fd6f4 749 XPUSHs(&PL_sv_yes);
a0d0e21e
LW
750 RETURN;
751
752 just_say_no:
753 SP = ORIGMARK;
e52fd6f4 754 XPUSHs(&PL_sv_undef);
a0d0e21e
LW
755 RETURN;
756}
757
758PP(pp_rv2av)
759{
97aff369 760 dVAR; dSP; dTOPss;
cde874ca 761 const I32 gimme = GIMME_V;
17ab7946
NC
762 static const char an_array[] = "an ARRAY";
763 static const char a_hash[] = "a HASH";
764 const bool is_pp_rv2av = PL_op->op_type == OP_RV2AV;
d83b45b8 765 const svtype type = is_pp_rv2av ? SVt_PVAV : SVt_PVHV;
a0d0e21e 766
9026059d 767 SvGETMAGIC(sv);
a0d0e21e 768 if (SvROK(sv)) {
93d7320b
DM
769 if (SvAMAGIC(sv)) {
770 sv = amagic_deref_call(sv, is_pp_rv2av ? to_av_amg : to_hv_amg);
93d7320b 771 }
17ab7946
NC
772 sv = SvRV(sv);
773 if (SvTYPE(sv) != type)
dcbac5bb 774 /* diag_listed_as: Not an ARRAY reference */
17ab7946 775 DIE(aTHX_ "Not %s reference", is_pp_rv2av ? an_array : a_hash);
533c011a 776 if (PL_op->op_flags & OPf_REF) {
17ab7946 777 SETs(sv);
a0d0e21e
LW
778 RETURN;
779 }
40c94d11
FC
780 else if (PL_op->op_private & OPpMAYBE_LVSUB) {
781 const I32 flags = is_lvalue_sub();
782 if (flags && !(flags & OPpENTERSUB_INARGS)) {
cde874ca 783 if (gimme != G_ARRAY)
042560a6 784 goto croak_cant_return;
17ab7946 785 SETs(sv);
78f9721b 786 RETURN;
40c94d11 787 }
78f9721b 788 }
82d03984
RGS
789 else if (PL_op->op_flags & OPf_MOD
790 && PL_op->op_private & OPpLVAL_INTRO)
f1f66076 791 Perl_croak(aTHX_ "%s", PL_no_localize_ref);
a0d0e21e
LW
792 }
793 else {
17ab7946 794 if (SvTYPE(sv) == type) {
533c011a 795 if (PL_op->op_flags & OPf_REF) {
17ab7946 796 SETs(sv);
a0d0e21e
LW
797 RETURN;
798 }
78f9721b 799 else if (LVRET) {
cde874ca 800 if (gimme != G_ARRAY)
042560a6 801 goto croak_cant_return;
17ab7946 802 SETs(sv);
78f9721b
SM
803 RETURN;
804 }
a0d0e21e
LW
805 }
806 else {
67955e0c 807 GV *gv;
1c846c1f 808
6e592b3a 809 if (!isGV_with_GP(sv)) {
dc3c76f8
NC
810 gv = Perl_softref2xv(aTHX_ sv, is_pp_rv2av ? an_array : a_hash,
811 type, &sp);
812 if (!gv)
813 RETURN;
35cd451c
GS
814 }
815 else {
159b6efe 816 gv = MUTABLE_GV(sv);
a0d0e21e 817 }
ad64d0ec 818 sv = is_pp_rv2av ? MUTABLE_SV(GvAVn(gv)) : MUTABLE_SV(GvHVn(gv));
533c011a 819 if (PL_op->op_private & OPpLVAL_INTRO)
ad64d0ec 820 sv = is_pp_rv2av ? MUTABLE_SV(save_ary(gv)) : MUTABLE_SV(save_hash(gv));
533c011a 821 if (PL_op->op_flags & OPf_REF) {
17ab7946 822 SETs(sv);
a0d0e21e
LW
823 RETURN;
824 }
40c94d11
FC
825 else if (PL_op->op_private & OPpMAYBE_LVSUB) {
826 const I32 flags = is_lvalue_sub();
827 if (flags && !(flags & OPpENTERSUB_INARGS)) {
cde874ca 828 if (gimme != G_ARRAY)
042560a6 829 goto croak_cant_return;
17ab7946 830 SETs(sv);
78f9721b 831 RETURN;
40c94d11 832 }
78f9721b 833 }
a0d0e21e
LW
834 }
835 }
836
17ab7946 837 if (is_pp_rv2av) {
502c6561 838 AV *const av = MUTABLE_AV(sv);
486ec47a 839 /* The guts of pp_rv2av, with no intending change to preserve history
17ab7946
NC
840 (until such time as we get tools that can do blame annotation across
841 whitespace changes. */
96913b52
VP
842 if (gimme == G_ARRAY) {
843 const I32 maxarg = AvFILL(av) + 1;
844 (void)POPs; /* XXXX May be optimized away? */
845 EXTEND(SP, maxarg);
846 if (SvRMAGICAL(av)) {
847 U32 i;
848 for (i=0; i < (U32)maxarg; i++) {
849 SV ** const svp = av_fetch(av, i, FALSE);
850 /* See note in pp_helem, and bug id #27839 */
851 SP[i+1] = svp
852 ? SvGMAGICAL(*svp) ? (mg_get(*svp), *svp) : *svp
853 : &PL_sv_undef;
854 }
855 }
856 else {
857 Copy(AvARRAY(av), SP+1, maxarg, SV*);
93965878 858 }
96913b52 859 SP += maxarg;
1c846c1f 860 }
96913b52
VP
861 else if (gimme == G_SCALAR) {
862 dTARGET;
863 const I32 maxarg = AvFILL(av) + 1;
864 SETi(maxarg);
93965878 865 }
17ab7946
NC
866 } else {
867 /* The guts of pp_rv2hv */
96913b52
VP
868 if (gimme == G_ARRAY) { /* array wanted */
869 *PL_stack_sp = sv;
981b7185 870 return Perl_do_kv(aTHX);
96913b52
VP
871 }
872 else if (gimme == G_SCALAR) {
873 dTARGET;
874 TARG = Perl_hv_scalar(aTHX_ MUTABLE_HV(sv));
875 SPAGAIN;
876 SETTARG;
877 }
17ab7946 878 }
be85d344 879 RETURN;
042560a6
NC
880
881 croak_cant_return:
882 Perl_croak(aTHX_ "Can't return %s to lvalue scalar context",
883 is_pp_rv2av ? "array" : "hash");
77e217c6 884 RETURN;
a0d0e21e
LW
885}
886
10c8fecd
GS
887STATIC void
888S_do_oddball(pTHX_ HV *hash, SV **relem, SV **firstrelem)
889{
97aff369 890 dVAR;
7918f24d
NC
891
892 PERL_ARGS_ASSERT_DO_ODDBALL;
893
10c8fecd
GS
894 if (*relem) {
895 SV *tmpstr;
b464bac0 896 const HE *didstore;
6d822dc4
MS
897
898 if (ckWARN(WARN_MISC)) {
a3b680e6 899 const char *err;
10c8fecd
GS
900 if (relem == firstrelem &&
901 SvROK(*relem) &&
902 (SvTYPE(SvRV(*relem)) == SVt_PVAV ||
903 SvTYPE(SvRV(*relem)) == SVt_PVHV))
904 {
a3b680e6 905 err = "Reference found where even-sized list expected";
10c8fecd
GS
906 }
907 else
a3b680e6 908 err = "Odd number of elements in hash assignment";
f1f66076 909 Perl_warner(aTHX_ packWARN(WARN_MISC), "%s", err);
10c8fecd 910 }
6d822dc4 911
561b68a9 912 tmpstr = newSV(0);
6d822dc4
MS
913 didstore = hv_store_ent(hash,*relem,tmpstr,0);
914 if (SvMAGICAL(hash)) {
915 if (SvSMAGICAL(tmpstr))
916 mg_set(tmpstr);
917 if (!didstore)
918 sv_2mortal(tmpstr);
919 }
920 TAINT_NOT;
10c8fecd
GS
921 }
922}
923
a0d0e21e
LW
924PP(pp_aassign)
925{
27da23d5 926 dVAR; dSP;
3280af22
NIS
927 SV **lastlelem = PL_stack_sp;
928 SV **lastrelem = PL_stack_base + POPMARK;
929 SV **firstrelem = PL_stack_base + POPMARK + 1;
a0d0e21e
LW
930 SV **firstlelem = lastrelem + 1;
931
932 register SV **relem;
933 register SV **lelem;
934
935 register SV *sv;
936 register AV *ary;
937
54310121 938 I32 gimme;
a0d0e21e
LW
939 HV *hash;
940 I32 i;
941 int magic;
ca65944e 942 int duplicates = 0;
cbbf8932 943 SV **firsthashrelem = NULL; /* "= 0" keeps gcc 2.95 quiet */
5637b936 944
3280af22 945 PL_delaymagic = DM_DELAY; /* catch simultaneous items */
ca65944e 946 gimme = GIMME_V;
a0d0e21e
LW
947
948 /* If there's a common identifier on both sides we have to take
949 * special care that assigning the identifier on the left doesn't
950 * clobber a value on the right that's used later in the list.
acdea6f0 951 * Don't bother if LHS is just an empty hash or array.
a0d0e21e 952 */
acdea6f0
DM
953
954 if ( (PL_op->op_private & OPpASSIGN_COMMON)
955 && (
956 firstlelem != lastlelem
957 || ! ((sv = *firstlelem))
958 || SvMAGICAL(sv)
959 || ! (SvTYPE(sv) == SVt_PVAV || SvTYPE(sv) == SVt_PVHV)
960 || (SvTYPE(sv) == SVt_PVAV && AvFILL((AV*)sv) != -1)
1b95d04f 961 || (SvTYPE(sv) == SVt_PVHV && HvUSEDKEYS((HV*)sv) != 0)
acdea6f0
DM
962 )
963 ) {
cc5e57d2 964 EXTEND_MORTAL(lastrelem - firstrelem + 1);
10c8fecd 965 for (relem = firstrelem; relem <= lastrelem; relem++) {
155aba94 966 if ((sv = *relem)) {
a1f49e72 967 TAINT_NOT; /* Each item is independent */
61e5f455
NC
968
969 /* Dear TODO test in t/op/sort.t, I love you.
970 (It's relying on a panic, not a "semi-panic" from newSVsv()
971 and then an assertion failure below.) */
972 if (SvIS_FREED(sv)) {
973 Perl_croak(aTHX_ "panic: attempt to copy freed scalar %p",
974 (void*)sv);
975 }
976 /* Specifically *not* sv_mortalcopy(), as that will steal TEMPs,
977 and we need a second copy of a temp here. */
978 *relem = sv_2mortal(newSVsv(sv));
a1f49e72 979 }
10c8fecd 980 }
a0d0e21e
LW
981 }
982
983 relem = firstrelem;
984 lelem = firstlelem;
4608196e
RGS
985 ary = NULL;
986 hash = NULL;
10c8fecd 987
a0d0e21e 988 while (lelem <= lastlelem) {
bbce6d69 989 TAINT_NOT; /* Each item stands on its own, taintwise. */
a0d0e21e
LW
990 sv = *lelem++;
991 switch (SvTYPE(sv)) {
992 case SVt_PVAV:
60edcf09 993 ary = MUTABLE_AV(sv);
748a9306 994 magic = SvMAGICAL(ary) != 0;
60edcf09
FC
995 ENTER;
996 SAVEFREESV(SvREFCNT_inc_simple_NN(sv));
a0d0e21e 997 av_clear(ary);
7e42bd57 998 av_extend(ary, lastrelem - relem);
a0d0e21e
LW
999 i = 0;
1000 while (relem <= lastrelem) { /* gobble up all the rest */
5117ca91 1001 SV **didstore;
a0d0e21e 1002 assert(*relem);
4f0556e9
NC
1003 sv = newSV(0);
1004 sv_setsv(sv, *relem);
a0d0e21e 1005 *(relem++) = sv;
5117ca91
GS
1006 didstore = av_store(ary,i++,sv);
1007 if (magic) {
8ef24240 1008 if (SvSMAGICAL(sv))
fb73857a 1009 mg_set(sv);
5117ca91 1010 if (!didstore)
8127e0e3 1011 sv_2mortal(sv);
5117ca91 1012 }
bbce6d69 1013 TAINT_NOT;
a0d0e21e 1014 }
354b0578 1015 if (PL_delaymagic & DM_ARRAY_ISA)
ad64d0ec 1016 SvSETMAGIC(MUTABLE_SV(ary));
60edcf09 1017 LEAVE;
a0d0e21e 1018 break;
10c8fecd 1019 case SVt_PVHV: { /* normal hash */
a0d0e21e 1020 SV *tmpstr;
45960564 1021 SV** topelem = relem;
a0d0e21e 1022
60edcf09 1023 hash = MUTABLE_HV(sv);
748a9306 1024 magic = SvMAGICAL(hash) != 0;
60edcf09
FC
1025 ENTER;
1026 SAVEFREESV(SvREFCNT_inc_simple_NN(sv));
a0d0e21e 1027 hv_clear(hash);
ca65944e 1028 firsthashrelem = relem;
a0d0e21e
LW
1029
1030 while (relem < lastrelem) { /* gobble up all the rest */
5117ca91 1031 HE *didstore;
6136c704
AL
1032 sv = *relem ? *relem : &PL_sv_no;
1033 relem++;
561b68a9 1034 tmpstr = newSV(0);
a0d0e21e
LW
1035 if (*relem)
1036 sv_setsv(tmpstr,*relem); /* value */
45960564
DM
1037 relem++;
1038 if (gimme != G_VOID) {
1039 if (hv_exists_ent(hash, sv, 0))
1040 /* key overwrites an existing entry */
1041 duplicates += 2;
1042 else
1043 if (gimme == G_ARRAY) {
1044 /* copy element back: possibly to an earlier
1045 * stack location if we encountered dups earlier */
1046 *topelem++ = sv;
1047 *topelem++ = tmpstr;
1048 }
1049 }
5117ca91
GS
1050 didstore = hv_store_ent(hash,sv,tmpstr,0);
1051 if (magic) {
8ef24240 1052 if (SvSMAGICAL(tmpstr))
fb73857a 1053 mg_set(tmpstr);
5117ca91 1054 if (!didstore)
8127e0e3 1055 sv_2mortal(tmpstr);
5117ca91 1056 }
bbce6d69 1057 TAINT_NOT;
8e07c86e 1058 }
6a0deba8 1059 if (relem == lastrelem) {
10c8fecd 1060 do_oddball(hash, relem, firstrelem);
6a0deba8 1061 relem++;
1930e939 1062 }
60edcf09 1063 LEAVE;
a0d0e21e
LW
1064 }
1065 break;
1066 default:
6fc92669
GS
1067 if (SvIMMORTAL(sv)) {
1068 if (relem <= lastrelem)
1069 relem++;
1070 break;
a0d0e21e
LW
1071 }
1072 if (relem <= lastrelem) {
1c70fb82
FC
1073 if (
1074 SvTEMP(sv) && !SvSMAGICAL(sv) && SvREFCNT(sv) == 1 &&
1075 (!isGV_with_GP(sv) || SvFAKE(sv)) && ckWARN(WARN_MISC)
1076 )
1077 Perl_warner(aTHX_
1078 packWARN(WARN_MISC),
1079 "Useless assignment to a temporary"
1080 );
a0d0e21e
LW
1081 sv_setsv(sv, *relem);
1082 *(relem++) = sv;
1083 }
1084 else
3280af22 1085 sv_setsv(sv, &PL_sv_undef);
8ef24240 1086 SvSETMAGIC(sv);
a0d0e21e
LW
1087 break;
1088 }
1089 }
3280af22 1090 if (PL_delaymagic & ~DM_DELAY) {
985213f2
AB
1091 /* Will be used to set PL_tainting below */
1092 UV tmp_uid = PerlProc_getuid();
1093 UV tmp_euid = PerlProc_geteuid();
1094 UV tmp_gid = PerlProc_getgid();
1095 UV tmp_egid = PerlProc_getegid();
1096
3280af22 1097 if (PL_delaymagic & DM_UID) {
a0d0e21e 1098#ifdef HAS_SETRESUID
985213f2
AB
1099 (void)setresuid((PL_delaymagic & DM_RUID) ? PL_delaymagic_uid : (Uid_t)-1,
1100 (PL_delaymagic & DM_EUID) ? PL_delaymagic_euid : (Uid_t)-1,
fb934a90 1101 (Uid_t)-1);
56febc5e
AD
1102#else
1103# ifdef HAS_SETREUID
985213f2
AB
1104 (void)setreuid((PL_delaymagic & DM_RUID) ? PL_delaymagic_uid : (Uid_t)-1,
1105 (PL_delaymagic & DM_EUID) ? PL_delaymagic_euid : (Uid_t)-1);
56febc5e
AD
1106# else
1107# ifdef HAS_SETRUID
b28d0864 1108 if ((PL_delaymagic & DM_UID) == DM_RUID) {
985213f2 1109 (void)setruid(PL_delaymagic_uid);
b28d0864 1110 PL_delaymagic &= ~DM_RUID;
a0d0e21e 1111 }
56febc5e
AD
1112# endif /* HAS_SETRUID */
1113# ifdef HAS_SETEUID
b28d0864 1114 if ((PL_delaymagic & DM_UID) == DM_EUID) {
985213f2 1115 (void)seteuid(PL_delaymagic_euid);
b28d0864 1116 PL_delaymagic &= ~DM_EUID;
a0d0e21e 1117 }
56febc5e 1118# endif /* HAS_SETEUID */
b28d0864 1119 if (PL_delaymagic & DM_UID) {
985213f2 1120 if (PL_delaymagic_uid != PL_delaymagic_euid)
cea2e8a9 1121 DIE(aTHX_ "No setreuid available");
985213f2 1122 (void)PerlProc_setuid(PL_delaymagic_uid);
a0d0e21e 1123 }
56febc5e
AD
1124# endif /* HAS_SETREUID */
1125#endif /* HAS_SETRESUID */
985213f2
AB
1126 tmp_uid = PerlProc_getuid();
1127 tmp_euid = PerlProc_geteuid();
a0d0e21e 1128 }
3280af22 1129 if (PL_delaymagic & DM_GID) {
a0d0e21e 1130#ifdef HAS_SETRESGID
985213f2
AB
1131 (void)setresgid((PL_delaymagic & DM_RGID) ? PL_delaymagic_gid : (Gid_t)-1,
1132 (PL_delaymagic & DM_EGID) ? PL_delaymagic_egid : (Gid_t)-1,
fb934a90 1133 (Gid_t)-1);
56febc5e
AD
1134#else
1135# ifdef HAS_SETREGID
985213f2
AB
1136 (void)setregid((PL_delaymagic & DM_RGID) ? PL_delaymagic_gid : (Gid_t)-1,
1137 (PL_delaymagic & DM_EGID) ? PL_delaymagic_egid : (Gid_t)-1);
56febc5e
AD
1138# else
1139# ifdef HAS_SETRGID
b28d0864 1140 if ((PL_delaymagic & DM_GID) == DM_RGID) {
985213f2 1141 (void)setrgid(PL_delaymagic_gid);
b28d0864 1142 PL_delaymagic &= ~DM_RGID;
a0d0e21e 1143 }
56febc5e
AD
1144# endif /* HAS_SETRGID */
1145# ifdef HAS_SETEGID
b28d0864 1146 if ((PL_delaymagic & DM_GID) == DM_EGID) {
985213f2 1147 (void)setegid(PL_delaymagic_egid);
b28d0864 1148 PL_delaymagic &= ~DM_EGID;
a0d0e21e 1149 }
56febc5e 1150# endif /* HAS_SETEGID */
b28d0864 1151 if (PL_delaymagic & DM_GID) {
985213f2 1152 if (PL_delaymagic_gid != PL_delaymagic_egid)
cea2e8a9 1153 DIE(aTHX_ "No setregid available");
985213f2 1154 (void)PerlProc_setgid(PL_delaymagic_gid);
a0d0e21e 1155 }
56febc5e
AD
1156# endif /* HAS_SETREGID */
1157#endif /* HAS_SETRESGID */
985213f2
AB
1158 tmp_gid = PerlProc_getgid();
1159 tmp_egid = PerlProc_getegid();
a0d0e21e 1160 }
985213f2 1161 PL_tainting |= (tmp_uid && (tmp_euid != tmp_uid || tmp_egid != tmp_gid));
a0d0e21e 1162 }
3280af22 1163 PL_delaymagic = 0;
54310121 1164
54310121
PP
1165 if (gimme == G_VOID)
1166 SP = firstrelem - 1;
1167 else if (gimme == G_SCALAR) {
1168 dTARGET;
1169 SP = firstrelem;
ca65944e 1170 SETi(lastrelem - firstrelem + 1 - duplicates);
54310121
PP
1171 }
1172 else {
ca65944e 1173 if (ary)
a0d0e21e 1174 SP = lastrelem;
ca65944e
RGS
1175 else if (hash) {
1176 if (duplicates) {
45960564
DM
1177 /* at this point we have removed the duplicate key/value
1178 * pairs from the stack, but the remaining values may be
1179 * wrong; i.e. with (a 1 a 2 b 3) on the stack we've removed
1180 * the (a 2), but the stack now probably contains
1181 * (a <freed> b 3), because { hv_save(a,1); hv_save(a,2) }
1182 * obliterates the earlier key. So refresh all values. */
ca65944e 1183 lastrelem -= duplicates;
45960564
DM
1184 relem = firsthashrelem;
1185 while (relem < lastrelem) {
1186 HE *he;
1187 sv = *relem++;
1188 he = hv_fetch_ent(hash, sv, 0, 0);
1189 *relem++ = (he ? HeVAL(he) : &PL_sv_undef);
1190 }
ca65944e
RGS
1191 }
1192 SP = lastrelem;
1193 }
a0d0e21e
LW
1194 else
1195 SP = firstrelem + (lastlelem - firstlelem);
0c8c7a05 1196 lelem = firstlelem + (relem - firstrelem);
5f05dabc 1197 while (relem <= SP)
3280af22 1198 *relem++ = (lelem <= lastlelem) ? *lelem++ : &PL_sv_undef;
a0d0e21e 1199 }
08aeb9f7 1200
54310121 1201 RETURN;
a0d0e21e
LW
1202}
1203
8782bef2
GB
1204PP(pp_qr)
1205{
97aff369 1206 dVAR; dSP;
c4420975 1207 register PMOP * const pm = cPMOP;
fe578d7f 1208 REGEXP * rx = PM_GETRE(pm);
10599a69 1209 SV * const pkg = rx ? CALLREG_PACKAGE(rx) : NULL;
c4420975 1210 SV * const rv = sv_newmortal();
288b8c02
NC
1211
1212 SvUPGRADE(rv, SVt_IV);
c2123ae3
NC
1213 /* For a subroutine describing itself as "This is a hacky workaround" I'm
1214 loathe to use it here, but it seems to be the right fix. Or close.
1215 The key part appears to be that it's essential for pp_qr to return a new
1216 object (SV), which implies that there needs to be an effective way to
1217 generate a new SV from the existing SV that is pre-compiled in the
1218 optree. */
1219 SvRV_set(rv, MUTABLE_SV(reg_temp_copy(NULL, rx)));
288b8c02
NC
1220 SvROK_on(rv);
1221
1222 if (pkg) {
f815daf2 1223 HV *const stash = gv_stashsv(pkg, GV_ADD);
a954f6ee 1224 SvREFCNT_dec(pkg);
288b8c02
NC
1225 (void)sv_bless(rv, stash);
1226 }
1227
9274aefd 1228 if (RX_EXTFLAGS(rx) & RXf_TAINTED) {
e08e52cf 1229 SvTAINTED_on(rv);
9274aefd
DM
1230 SvTAINTED_on(SvRV(rv));
1231 }
c8c13c22 1232 XPUSHs(rv);
1233 RETURN;
8782bef2
GB
1234}
1235
a0d0e21e
LW
1236PP(pp_match)
1237{
97aff369 1238 dVAR; dSP; dTARG;
a0d0e21e 1239 register PMOP *pm = cPMOP;
d65afb4b 1240 PMOP *dynpm = pm;
0d46e09a
SP
1241 register const char *t;
1242 register const char *s;
5c144d81 1243 const char *strend;
a0d0e21e 1244 I32 global;
1ed74d04 1245 U8 r_flags = REXEC_CHECKED;
5c144d81 1246 const char *truebase; /* Start of string */
aaa362c4 1247 register REGEXP *rx = PM_GETRE(pm);
b3eb6a9b 1248 bool rxtainted;
a3b680e6 1249 const I32 gimme = GIMME;
a0d0e21e 1250 STRLEN len;
748a9306 1251 I32 minmatch = 0;
a3b680e6 1252 const I32 oldsave = PL_savestack_ix;
f86702cc 1253 I32 update_minmatch = 1;
e60df1fa 1254 I32 had_zerolen = 0;
58e23c8d 1255 U32 gpos = 0;
a0d0e21e 1256
533c011a 1257 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 1258 TARG = POPs;
59f00321
RGS
1259 else if (PL_op->op_private & OPpTARGET_MY)
1260 GETTARGET;
a0d0e21e 1261 else {
54b9620d 1262 TARG = DEFSV;
a0d0e21e
LW
1263 EXTEND(SP,1);
1264 }
d9f424b2 1265
c277df42 1266 PUTBACK; /* EVAL blocks need stack_sp. */
69dc4b30
FC
1267 /* Skip get-magic if this is a qr// clone, because regcomp has
1268 already done it. */
1269 s = ((struct regexp *)SvANY(rx))->mother_re
1270 ? SvPV_nomg_const(TARG, len)
1271 : SvPV_const(TARG, len);
a0d0e21e 1272 if (!s)
2269b42e 1273 DIE(aTHX_ "panic: pp_match");
890ce7af 1274 strend = s + len;
07bc277f 1275 rxtainted = ((RX_EXTFLAGS(rx) & RXf_TAINTED) ||
3280af22 1276 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
9212bbba 1277 TAINT_NOT;
a0d0e21e 1278
a30b2f1f 1279 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 1280
d65afb4b 1281 /* PMdf_USED is set after a ?? matches once */
c737faaf
YO
1282 if (
1283#ifdef USE_ITHREADS
1284 SvREADONLY(PL_regex_pad[pm->op_pmoffset])
1285#else
1286 pm->op_pmflags & PMf_USED
1287#endif
1288 ) {
c277df42 1289 failure:
a0d0e21e
LW
1290 if (gimme == G_ARRAY)
1291 RETURN;
1292 RETPUSHNO;
1293 }
1294
c737faaf
YO
1295
1296
d65afb4b 1297 /* empty pattern special-cased to use last successful pattern if possible */
220fc49f 1298 if (!RX_PRELEN(rx) && PL_curpm) {
3280af22 1299 pm = PL_curpm;
aaa362c4 1300 rx = PM_GETRE(pm);
a0d0e21e 1301 }
d65afb4b 1302
07bc277f 1303 if (RX_MINLEN(rx) > (I32)len)
d65afb4b 1304 goto failure;
c277df42 1305
a0d0e21e 1306 truebase = t = s;
ad94a511
IZ
1307
1308 /* XXXX What part of this is needed with true \G-support? */
d65afb4b 1309 if ((global = dynpm->op_pmflags & PMf_GLOBAL)) {
07bc277f 1310 RX_OFFS(rx)[0].start = -1;
a0d0e21e 1311 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
c445ea15 1312 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
565764a8 1313 if (mg && mg->mg_len >= 0) {
07bc277f
NC
1314 if (!(RX_EXTFLAGS(rx) & RXf_GPOS_SEEN))
1315 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1316 else if (RX_EXTFLAGS(rx) & RXf_ANCH_GPOS) {
0ef3e39e 1317 r_flags |= REXEC_IGNOREPOS;
07bc277f
NC
1318 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1319 } else if (RX_EXTFLAGS(rx) & RXf_GPOS_FLOAT)
58e23c8d
YO
1320 gpos = mg->mg_len;
1321 else
07bc277f
NC
1322 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1323 minmatch = (mg->mg_flags & MGf_MINMATCH) ? RX_GOFS(rx) + 1 : 0;
f86702cc 1324 update_minmatch = 0;
748a9306 1325 }
a0d0e21e
LW
1326 }
1327 }
a229a030 1328 /* XXX: comment out !global get safe $1 vars after a
62e7980d 1329 match, BUT be aware that this leads to dramatic slowdowns on
a229a030
YO
1330 /g matches against large strings. So far a solution to this problem
1331 appears to be quite tricky.
1332 Test for the unsafe vars are TODO for now. */
0d8a731b
DM
1333 if ( (!global && RX_NPARENS(rx))
1334 || SvTEMP(TARG) || SvAMAGIC(TARG) || PL_sawampersand
1335 || (RX_EXTFLAGS(rx) & (RXf_EVAL_SEEN|RXf_PMf_KEEPCOPY)))
14977893 1336 r_flags |= REXEC_COPY_STR;
22e551b9 1337
d7be1480 1338 play_it_again:
07bc277f
NC
1339 if (global && RX_OFFS(rx)[0].start != -1) {
1340 t = s = RX_OFFS(rx)[0].end + truebase - RX_GOFS(rx);
1341 if ((s + RX_MINLEN(rx)) > strend || s < truebase)
a0d0e21e 1342 goto nope;
f86702cc 1343 if (update_minmatch++)
e60df1fa 1344 minmatch = had_zerolen;
a0d0e21e 1345 }
07bc277f 1346 if (RX_EXTFLAGS(rx) & RXf_USE_INTUIT &&
3c8556c3 1347 DO_UTF8(TARG) == (RX_UTF8(rx) != 0)) {
5c144d81
NC
1348 /* FIXME - can PL_bostr be made const char *? */
1349 PL_bostr = (char *)truebase;
f9f4320a 1350 s = CALLREG_INTUIT_START(rx, TARG, (char *)s, (char *)strend, r_flags, NULL);
f722798b
IZ
1351
1352 if (!s)
1353 goto nope;
07bc277f 1354 if ( (RX_EXTFLAGS(rx) & RXf_CHECK_ALL)
14977893 1355 && !PL_sawampersand
07bc277f 1356 && !(RX_EXTFLAGS(rx) & RXf_PMf_KEEPCOPY)
05b4157f 1357 && !SvROK(TARG)) /* Cannot trust since INTUIT cannot guess ^ */
f722798b 1358 goto yup;
a0d0e21e 1359 }
77da2310
NC
1360 if (!CALLREGEXEC(rx, (char*)s, (char *)strend, (char*)truebase,
1361 minmatch, TARG, NUM2PTR(void*, gpos), r_flags))
1362 goto ret_no;
1363
1364 PL_curpm = pm;
1365 if (dynpm->op_pmflags & PMf_ONCE) {
c737faaf 1366#ifdef USE_ITHREADS
77da2310 1367 SvREADONLY_on(PL_regex_pad[dynpm->op_pmoffset]);
c737faaf 1368#else
77da2310 1369 dynpm->op_pmflags |= PMf_USED;
c737faaf 1370#endif
a0d0e21e 1371 }
a0d0e21e
LW
1372
1373 gotcha:
72311751
GS
1374 if (rxtainted)
1375 RX_MATCH_TAINTED_on(rx);
1376 TAINT_IF(RX_MATCH_TAINTED(rx));
a0d0e21e 1377 if (gimme == G_ARRAY) {
07bc277f 1378 const I32 nparens = RX_NPARENS(rx);
a3b680e6 1379 I32 i = (global && !nparens) ? 1 : 0;
a0d0e21e 1380
c277df42 1381 SPAGAIN; /* EVAL blocks could move the stack. */
ffc61ed2
JH
1382 EXTEND(SP, nparens + i);
1383 EXTEND_MORTAL(nparens + i);
1384 for (i = !i; i <= nparens; i++) {
a0d0e21e 1385 PUSHs(sv_newmortal());
07bc277f
NC
1386 if ((RX_OFFS(rx)[i].start != -1) && RX_OFFS(rx)[i].end != -1 ) {
1387 const I32 len = RX_OFFS(rx)[i].end - RX_OFFS(rx)[i].start;
1388 s = RX_OFFS(rx)[i].start + truebase;
1389 if (RX_OFFS(rx)[i].end < 0 || RX_OFFS(rx)[i].start < 0 ||
290deeac 1390 len < 0 || len > strend - s)
5637ef5b
NC
1391 DIE(aTHX_ "panic: pp_match start/end pointers, i=%ld, "
1392 "start=%ld, end=%ld, s=%p, strend=%p, len=%"UVuf,
1393 (long) i, (long) RX_OFFS(rx)[i].start,
1394 (long)RX_OFFS(rx)[i].end, s, strend, (UV) len);
a0d0e21e 1395 sv_setpvn(*SP, s, len);
cce850e4 1396 if (DO_UTF8(TARG) && is_utf8_string((U8*)s, len))
a197cbdd 1397 SvUTF8_on(*SP);
a0d0e21e
LW
1398 }
1399 }
1400 if (global) {
d65afb4b 1401 if (dynpm->op_pmflags & PMf_CONTINUE) {
6136c704 1402 MAGIC* mg = NULL;
0af80b60
HS
1403 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
1404 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1405 if (!mg) {
d83f0a82
NC
1406#ifdef PERL_OLD_COPY_ON_WRITE
1407 if (SvIsCOW(TARG))
1408 sv_force_normal_flags(TARG, 0);
1409#endif
1410 mg = sv_magicext(TARG, NULL, PERL_MAGIC_regex_global,
1411 &PL_vtbl_mglob, NULL, 0);
0af80b60 1412 }
07bc277f
NC
1413 if (RX_OFFS(rx)[0].start != -1) {
1414 mg->mg_len = RX_OFFS(rx)[0].end;
1415 if (RX_OFFS(rx)[0].start + RX_GOFS(rx) == (UV)RX_OFFS(rx)[0].end)
0af80b60
HS
1416 mg->mg_flags |= MGf_MINMATCH;
1417 else
1418 mg->mg_flags &= ~MGf_MINMATCH;
1419 }
1420 }
07bc277f
NC
1421 had_zerolen = (RX_OFFS(rx)[0].start != -1
1422 && (RX_OFFS(rx)[0].start + RX_GOFS(rx)
1423 == (UV)RX_OFFS(rx)[0].end));
c277df42 1424 PUTBACK; /* EVAL blocks may use stack */
cf93c79d 1425 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
1426 goto play_it_again;
1427 }
ffc61ed2 1428 else if (!nparens)
bde848c5 1429 XPUSHs(&PL_sv_yes);
4633a7c4 1430 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1431 RETURN;
1432 }
1433 else {
1434 if (global) {
cbbf8932 1435 MAGIC* mg;
a0d0e21e 1436 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
14befaf4 1437 mg = mg_find(TARG, PERL_MAGIC_regex_global);
cbbf8932
AL
1438 else
1439 mg = NULL;
a0d0e21e 1440 if (!mg) {
d83f0a82
NC
1441#ifdef PERL_OLD_COPY_ON_WRITE
1442 if (SvIsCOW(TARG))
1443 sv_force_normal_flags(TARG, 0);
1444#endif
1445 mg = sv_magicext(TARG, NULL, PERL_MAGIC_regex_global,
1446 &PL_vtbl_mglob, NULL, 0);
a0d0e21e 1447 }
07bc277f
NC
1448 if (RX_OFFS(rx)[0].start != -1) {
1449 mg->mg_len = RX_OFFS(rx)[0].end;
1450 if (RX_OFFS(rx)[0].start + RX_GOFS(rx) == (UV)RX_OFFS(rx)[0].end)
748a9306
LW
1451 mg->mg_flags |= MGf_MINMATCH;
1452 else
1453 mg->mg_flags &= ~MGf_MINMATCH;
1454 }
a0d0e21e 1455 }
4633a7c4 1456 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1457 RETPUSHYES;
1458 }
1459
f722798b 1460yup: /* Confirmed by INTUIT */
72311751
GS
1461 if (rxtainted)
1462 RX_MATCH_TAINTED_on(rx);
1463 TAINT_IF(RX_MATCH_TAINTED(rx));
3280af22 1464 PL_curpm = pm;
c737faaf
YO
1465 if (dynpm->op_pmflags & PMf_ONCE) {
1466#ifdef USE_ITHREADS
1467 SvREADONLY_on(PL_regex_pad[dynpm->op_pmoffset]);
1468#else
1469 dynpm->op_pmflags |= PMf_USED;
1470#endif
1471 }
cf93c79d 1472 if (RX_MATCH_COPIED(rx))
07bc277f 1473 Safefree(RX_SUBBEG(rx));
cf93c79d 1474 RX_MATCH_COPIED_off(rx);
07bc277f 1475 RX_SUBBEG(rx) = NULL;
a0d0e21e 1476 if (global) {
5c144d81 1477 /* FIXME - should rx->subbeg be const char *? */
07bc277f
NC
1478 RX_SUBBEG(rx) = (char *) truebase;
1479 RX_OFFS(rx)[0].start = s - truebase;
a30b2f1f 1480 if (RX_MATCH_UTF8(rx)) {
07bc277f
NC
1481 char * const t = (char*)utf8_hop((U8*)s, RX_MINLENRET(rx));
1482 RX_OFFS(rx)[0].end = t - truebase;
60aeb6fd
NIS
1483 }
1484 else {
07bc277f 1485 RX_OFFS(rx)[0].end = s - truebase + RX_MINLENRET(rx);
60aeb6fd 1486 }
07bc277f 1487 RX_SUBLEN(rx) = strend - truebase;
a0d0e21e 1488 goto gotcha;
1c846c1f 1489 }
07bc277f 1490 if (PL_sawampersand || RX_EXTFLAGS(rx) & RXf_PMf_KEEPCOPY) {
14977893 1491 I32 off;
f8c7b90f 1492#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
1493 if (SvIsCOW(TARG) || (SvFLAGS(TARG) & CAN_COW_MASK) == CAN_COW_FLAGS) {
1494 if (DEBUG_C_TEST) {
1495 PerlIO_printf(Perl_debug_log,
1496 "Copy on write: pp_match $& capture, type %d, truebase=%p, t=%p, difference %d\n",
6c9570dc 1497 (int) SvTYPE(TARG), (void*)truebase, (void*)t,
ed252734
NC
1498 (int)(t-truebase));
1499 }
bdd9a1b1
NC
1500 RX_SAVED_COPY(rx) = sv_setsv_cow(RX_SAVED_COPY(rx), TARG);
1501 RX_SUBBEG(rx)
1502 = (char *) SvPVX_const(RX_SAVED_COPY(rx)) + (t - truebase);
1503 assert (SvPOKp(RX_SAVED_COPY(rx)));
ed252734
NC
1504 } else
1505#endif
1506 {
14977893 1507
07bc277f 1508 RX_SUBBEG(rx) = savepvn(t, strend - t);
f8c7b90f 1509#ifdef PERL_OLD_COPY_ON_WRITE
bdd9a1b1 1510 RX_SAVED_COPY(rx) = NULL;
ed252734
NC
1511#endif
1512 }
07bc277f 1513 RX_SUBLEN(rx) = strend - t;
14977893 1514 RX_MATCH_COPIED_on(rx);
07bc277f
NC
1515 off = RX_OFFS(rx)[0].start = s - t;
1516 RX_OFFS(rx)[0].end = off + RX_MINLENRET(rx);
14977893
JH
1517 }
1518 else { /* startp/endp are used by @- @+. */
07bc277f
NC
1519 RX_OFFS(rx)[0].start = s - truebase;
1520 RX_OFFS(rx)[0].end = s - truebase + RX_MINLENRET(rx);
14977893 1521 }
07bc277f 1522 /* including RX_NPARENS(rx) in the below code seems highly suspicious.
cde0cee5 1523 -dmq */
07bc277f 1524 RX_NPARENS(rx) = RX_LASTPAREN(rx) = RX_LASTCLOSEPAREN(rx) = 0; /* used by @-, @+, and $^N */
4633a7c4 1525 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1526 RETPUSHYES;
1527
1528nope:
a0d0e21e 1529ret_no:
d65afb4b 1530 if (global && !(dynpm->op_pmflags & PMf_CONTINUE)) {
a0d0e21e 1531 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
6136c704 1532 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1533 if (mg)
565764a8 1534 mg->mg_len = -1;
a0d0e21e
LW
1535 }
1536 }
4633a7c4 1537 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1538 if (gimme == G_ARRAY)
1539 RETURN;
1540 RETPUSHNO;
1541}
1542
1543OP *
864dbfa3 1544Perl_do_readline(pTHX)
a0d0e21e 1545{
27da23d5 1546 dVAR; dSP; dTARGETSTACKED;
a0d0e21e
LW
1547 register SV *sv;
1548 STRLEN tmplen = 0;
1549 STRLEN offset;
760ac839 1550 PerlIO *fp;
a3b680e6
AL
1551 register IO * const io = GvIO(PL_last_in_gv);
1552 register const I32 type = PL_op->op_type;
1553 const I32 gimme = GIMME_V;
a0d0e21e 1554
6136c704 1555 if (io) {
50db69d8 1556 const MAGIC *const mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar);
6136c704 1557 if (mg) {
50db69d8 1558 Perl_tied_method(aTHX_ "READLINE", SP, MUTABLE_SV(io), mg, gimme, 0);
6136c704 1559 if (gimme == G_SCALAR) {
50db69d8
NC
1560 SPAGAIN;
1561 SvSetSV_nosteal(TARG, TOPs);
1562 SETTARG;
6136c704 1563 }
50db69d8 1564 return NORMAL;
0b7c7b4f 1565 }
e79b0511 1566 }
4608196e 1567 fp = NULL;
a0d0e21e
LW
1568 if (io) {
1569 fp = IoIFP(io);
1570 if (!fp) {
1571 if (IoFLAGS(io) & IOf_ARGV) {
1572 if (IoFLAGS(io) & IOf_START) {
a0d0e21e 1573 IoLINES(io) = 0;
3280af22 1574 if (av_len(GvAVn(PL_last_in_gv)) < 0) {
1d7c1841 1575 IoFLAGS(io) &= ~IOf_START;
4608196e 1576 do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,NULL);
76f68e9b 1577 sv_setpvs(GvSVn(PL_last_in_gv), "-");
3280af22 1578 SvSETMAGIC(GvSV(PL_last_in_gv));
a2008d6d
GS
1579 fp = IoIFP(io);
1580 goto have_fp;
a0d0e21e
LW
1581 }
1582 }
3280af22 1583 fp = nextargv(PL_last_in_gv);
a0d0e21e 1584 if (!fp) { /* Note: fp != IoIFP(io) */
3280af22 1585 (void)do_close(PL_last_in_gv, FALSE); /* now it does*/
a0d0e21e
LW
1586 }
1587 }
0d44d22b
NC
1588 else if (type == OP_GLOB)
1589 fp = Perl_start_glob(aTHX_ POPs, io);
a0d0e21e
LW
1590 }
1591 else if (type == OP_GLOB)
1592 SP--;
7716c5c5 1593 else if (IoTYPE(io) == IoTYPE_WRONLY) {
a5390457 1594 report_wrongway_fh(PL_last_in_gv, '>');
a00b5bd3 1595 }
a0d0e21e
LW
1596 }
1597 if (!fp) {
041457d9
DM
1598 if ((!io || !(IoFLAGS(io) & IOf_START))
1599 && ckWARN2(WARN_GLOB, WARN_CLOSED))
1600 {
3f4520fe 1601 if (type == OP_GLOB)
63922903 1602 Perl_ck_warner_d(aTHX_ packWARN(WARN_GLOB),
af8c498a
GS
1603 "glob failed (can't start child: %s)",
1604 Strerror(errno));
69282e91 1605 else
831e4cc3 1606 report_evil_fh(PL_last_in_gv);
3f4520fe 1607 }
54310121 1608 if (gimme == G_SCALAR) {
79628082 1609 /* undef TARG, and push that undefined value */
ba92458f
AE
1610 if (type != OP_RCATLINE) {
1611 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1612 SvOK_off(TARG);
ba92458f 1613 }
a0d0e21e
LW
1614 PUSHTARG;
1615 }
1616 RETURN;
1617 }
a2008d6d 1618 have_fp:
54310121 1619 if (gimme == G_SCALAR) {
a0d0e21e 1620 sv = TARG;
0f722b55
RGS
1621 if (type == OP_RCATLINE && SvGMAGICAL(sv))
1622 mg_get(sv);
48de12d9
RGS
1623 if (SvROK(sv)) {
1624 if (type == OP_RCATLINE)
5668452f 1625 SvPV_force_nomg_nolen(sv);
48de12d9
RGS
1626 else
1627 sv_unref(sv);
1628 }
f7877b28 1629 else if (isGV_with_GP(sv)) {
5668452f 1630 SvPV_force_nomg_nolen(sv);
f7877b28 1631 }
862a34c6 1632 SvUPGRADE(sv, SVt_PV);
a0d0e21e 1633 tmplen = SvLEN(sv); /* remember if already alloced */
f72e8700
JJ
1634 if (!tmplen && !SvREADONLY(sv)) {
1635 /* try short-buffering it. Please update t/op/readline.t
1636 * if you change the growth length.
1637 */
1638 Sv_Grow(sv, 80);
1639 }
2b5e58c4
AMS
1640 offset = 0;
1641 if (type == OP_RCATLINE && SvOK(sv)) {
1642 if (!SvPOK(sv)) {
5668452f 1643 SvPV_force_nomg_nolen(sv);
2b5e58c4 1644 }
a0d0e21e 1645 offset = SvCUR(sv);
2b5e58c4 1646 }
a0d0e21e 1647 }
54310121 1648 else {
561b68a9 1649 sv = sv_2mortal(newSV(80));
54310121
PP
1650 offset = 0;
1651 }
fbad3eb5 1652
3887d568
AP
1653 /* This should not be marked tainted if the fp is marked clean */
1654#define MAYBE_TAINT_LINE(io, sv) \
1655 if (!(IoFLAGS(io) & IOf_UNTAINT)) { \
1656 TAINT; \
1657 SvTAINTED_on(sv); \
1658 }
1659
684bef36 1660/* delay EOF state for a snarfed empty file */
fbad3eb5 1661#define SNARF_EOF(gimme,rs,io,sv) \
684bef36 1662 (gimme != G_SCALAR || SvCUR(sv) \
b9fee9ba 1663 || (IoFLAGS(io) & IOf_NOLINE) || !RsSNARF(rs))
fbad3eb5 1664
a0d0e21e 1665 for (;;) {
09e8efcc 1666 PUTBACK;
fbad3eb5 1667 if (!sv_gets(sv, fp, offset)
2d726892
TF
1668 && (type == OP_GLOB
1669 || SNARF_EOF(gimme, PL_rs, io, sv)
1670 || PerlIO_error(fp)))
fbad3eb5 1671 {
760ac839 1672 PerlIO_clearerr(fp);
a0d0e21e 1673 if (IoFLAGS(io) & IOf_ARGV) {
3280af22 1674 fp = nextargv(PL_last_in_gv);
a0d0e21e
LW
1675 if (fp)
1676 continue;
3280af22 1677 (void)do_close(PL_last_in_gv, FALSE);
a0d0e21e
LW
1678 }
1679 else if (type == OP_GLOB) {
a2a5de95
NC
1680 if (!do_close(PL_last_in_gv, FALSE)) {
1681 Perl_ck_warner(aTHX_ packWARN(WARN_GLOB),
1682 "glob failed (child exited with status %d%s)",
1683 (int)(STATUS_CURRENT >> 8),
1684 (STATUS_CURRENT & 0x80) ? ", core dumped" : "");
4eb79ab5 1685 }
a0d0e21e 1686 }
54310121 1687 if (gimme == G_SCALAR) {
ba92458f
AE
1688 if (type != OP_RCATLINE) {
1689 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1690 SvOK_off(TARG);
ba92458f 1691 }
09e8efcc 1692 SPAGAIN;
a0d0e21e
LW
1693 PUSHTARG;
1694 }
3887d568 1695 MAYBE_TAINT_LINE(io, sv);
a0d0e21e
LW
1696 RETURN;
1697 }
3887d568 1698 MAYBE_TAINT_LINE(io, sv);
a0d0e21e 1699 IoLINES(io)++;
b9fee9ba 1700 IoFLAGS(io) |= IOf_NOLINE;
71be2cbc 1701 SvSETMAGIC(sv);
09e8efcc 1702 SPAGAIN;
a0d0e21e 1703 XPUSHs(sv);
a0d0e21e 1704 if (type == OP_GLOB) {
349d4f2f 1705 const char *t1;
a0d0e21e 1706
3280af22 1707 if (SvCUR(sv) > 0 && SvCUR(PL_rs) > 0) {
6136c704 1708 char * const tmps = SvEND(sv) - 1;
aa07b2f6 1709 if (*tmps == *SvPVX_const(PL_rs)) {
c07a80fd 1710 *tmps = '\0';
b162af07 1711 SvCUR_set(sv, SvCUR(sv) - 1);
c07a80fd
PP
1712 }
1713 }
349d4f2f
NC
1714 for (t1 = SvPVX_const(sv); *t1; t1++)
1715 if (!isALPHA(*t1) && !isDIGIT(*t1) &&
1716 strchr("$&*(){}[]'\";\\|?<>~`", *t1))
a0d0e21e 1717 break;
349d4f2f 1718 if (*t1 && PerlLIO_lstat(SvPVX_const(sv), &PL_statbuf) < 0) {
a0d0e21e
LW
1719 (void)POPs; /* Unmatched wildcard? Chuck it... */
1720 continue;
1721 }
2d79bf7f 1722 } else if (SvUTF8(sv)) { /* OP_READLINE, OP_RCATLINE */
d4c19fe8
AL
1723 if (ckWARN(WARN_UTF8)) {
1724 const U8 * const s = (const U8*)SvPVX_const(sv) + offset;
1725 const STRLEN len = SvCUR(sv) - offset;
1726 const U8 *f;
1727
1728 if (!is_utf8_string_loc(s, len, &f))
1729 /* Emulate :encoding(utf8) warning in the same case. */
1730 Perl_warner(aTHX_ packWARN(WARN_UTF8),
1731 "utf8 \"\\x%02X\" does not map to Unicode",
1732 f < (U8*)SvEND(sv) ? *f : 0);
1733 }
a0d0e21e 1734 }
54310121 1735 if (gimme == G_ARRAY) {
a0d0e21e 1736 if (SvLEN(sv) - SvCUR(sv) > 20) {
1da4ca5f 1737 SvPV_shrink_to_cur(sv);
a0d0e21e 1738 }
561b68a9 1739 sv = sv_2mortal(newSV(80));
a0d0e21e
LW
1740 continue;
1741 }
54310121 1742 else if (gimme == G_SCALAR && !tmplen && SvLEN(sv) - SvCUR(sv) > 80) {
a0d0e21e 1743 /* try to reclaim a bit of scalar space (only on 1st alloc) */
d5b5861b
NC
1744 const STRLEN new_len
1745 = SvCUR(sv) < 60 ? 80 : SvCUR(sv)+40; /* allow some slop */
1da4ca5f 1746 SvPV_renew(sv, new_len);
a0d0e21e
LW
1747 }
1748 RETURN;
1749 }
1750}
1751
a0d0e21e
LW
1752PP(pp_helem)
1753{
97aff369 1754 dVAR; dSP;
760ac839 1755 HE* he;
ae77835f 1756 SV **svp;
c445ea15 1757 SV * const keysv = POPs;
85fbaab2 1758 HV * const hv = MUTABLE_HV(POPs);
a3b680e6
AL
1759 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
1760 const U32 defer = PL_op->op_private & OPpLVAL_DEFER;
be6c24e0 1761 SV *sv;
c158a4fd 1762 const U32 hash = (SvIsCOW_shared_hash(keysv)) ? SvSHARED_HASH(keysv) : 0;
92970b93 1763 const bool localizing = PL_op->op_private & OPpLVAL_INTRO;
d30e492c 1764 bool preeminent = TRUE;
a0d0e21e 1765
d4c19fe8 1766 if (SvTYPE(hv) != SVt_PVHV)
a0d0e21e 1767 RETPUSHUNDEF;
d4c19fe8 1768
92970b93 1769 if (localizing) {
d4c19fe8
AL
1770 MAGIC *mg;
1771 HV *stash;
d30e492c
VP
1772
1773 /* If we can determine whether the element exist,
1774 * Try to preserve the existenceness of a tied hash
1775 * element by using EXISTS and DELETE if possible.
1776 * Fallback to FETCH and STORE otherwise. */
1777 if (SvCANEXISTDELETE(hv) || mg_find((const SV *)hv, PERL_MAGIC_env))
1778 preeminent = hv_exists_ent(hv, keysv, 0);
d4c19fe8 1779 }
d30e492c 1780
d4c19fe8
AL
1781 he = hv_fetch_ent(hv, keysv, lval && !defer, hash);
1782 svp = he ? &HeVAL(he) : NULL;
a0d0e21e 1783 if (lval) {
746f6409 1784 if (!svp || !*svp || *svp == &PL_sv_undef) {
68dc0745
PP
1785 SV* lv;
1786 SV* key2;
2d8e6c8d 1787 if (!defer) {
be2597df 1788 DIE(aTHX_ PL_no_helem_sv, SVfARG(keysv));
2d8e6c8d 1789 }
68dc0745
PP
1790 lv = sv_newmortal();
1791 sv_upgrade(lv, SVt_PVLV);
1792 LvTYPE(lv) = 'y';
6136c704 1793 sv_magic(lv, key2 = newSVsv(keysv), PERL_MAGIC_defelem, NULL, 0);
68dc0745 1794 SvREFCNT_dec(key2); /* sv_magic() increments refcount */
b37c2d43 1795 LvTARG(lv) = SvREFCNT_inc_simple(hv);
68dc0745
PP
1796 LvTARGLEN(lv) = 1;
1797 PUSHs(lv);
1798 RETURN;
1799 }
92970b93 1800 if (localizing) {
bfcb3514 1801 if (HvNAME_get(hv) && isGV(*svp))
159b6efe 1802 save_gp(MUTABLE_GV(*svp), !(PL_op->op_flags & OPf_SPECIAL));
47cfc530
VP
1803 else if (preeminent)
1804 save_helem_flags(hv, keysv, svp,
1805 (PL_op->op_flags & OPf_SPECIAL) ? 0 : SAVEf_SETMAGIC);
1806 else
1807 SAVEHDELETE(hv, keysv);
5f05dabc 1808 }
9026059d
GG
1809 else if (PL_op->op_private & OPpDEREF) {
1810 PUSHs(vivify_ref(*svp, PL_op->op_private & OPpDEREF));
1811 RETURN;
1812 }
a0d0e21e 1813 }
746f6409 1814 sv = (svp && *svp ? *svp : &PL_sv_undef);
fd69380d
DM
1815 /* Originally this did a conditional C<sv = sv_mortalcopy(sv)>; this
1816 * was to make C<local $tied{foo} = $tied{foo}> possible.
1817 * However, it seems no longer to be needed for that purpose, and
1818 * introduced a new bug: stuff like C<while ($hash{taintedval} =~ /.../g>
1819 * would loop endlessly since the pos magic is getting set on the
1820 * mortal copy and lost. However, the copy has the effect of
1821 * triggering the get magic, and losing it altogether made things like
1822 * c<$tied{foo};> in void context no longer do get magic, which some
1823 * code relied on. Also, delayed triggering of magic on @+ and friends
1824 * meant the original regex may be out of scope by now. So as a
1825 * compromise, do the get magic here. (The MGf_GSKIP flag will stop it
1826 * being called too many times). */
39cf747a 1827 if (!lval && SvRMAGICAL(hv) && SvGMAGICAL(sv))
fd69380d 1828 mg_get(sv);
be6c24e0 1829 PUSHs(sv);
a0d0e21e
LW
1830 RETURN;
1831}
1832
a0d0e21e
LW
1833PP(pp_iter)
1834{
97aff369 1835 dVAR; dSP;
c09156bb 1836 register PERL_CONTEXT *cx;
dc09a129 1837 SV *sv, *oldsv;
1d7c1841 1838 SV **itersvp;
d01136d6
BS
1839 AV *av = NULL; /* used for LOOP_FOR on arrays and the stack */
1840 bool av_is_stack = FALSE;
a0d0e21e 1841
924508f0 1842 EXTEND(SP, 1);
a0d0e21e 1843 cx = &cxstack[cxstack_ix];
3b719c58 1844 if (!CxTYPE_is_LOOP(cx))
5637ef5b 1845 DIE(aTHX_ "panic: pp_iter, type=%u", CxTYPE(cx));
a0d0e21e 1846
1d7c1841 1847 itersvp = CxITERVAR(cx);
d01136d6 1848 if (CxTYPE(cx) == CXt_LOOP_LAZYSV) {
89ea2908 1849 /* string increment */
d01136d6
BS
1850 SV* cur = cx->blk_loop.state_u.lazysv.cur;
1851 SV *end = cx->blk_loop.state_u.lazysv.end;
267cc4a8
NC
1852 /* If the maximum is !SvOK(), pp_enteriter substitutes PL_sv_no.
1853 It has SvPVX of "" and SvCUR of 0, which is what we want. */
4fe3f0fa 1854 STRLEN maxlen = 0;
d01136d6 1855 const char *max = SvPV_const(end, maxlen);
89ea2908 1856 if (!SvNIOK(cur) && SvCUR(cur) <= maxlen) {
1d7c1841 1857 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1858 /* safe to reuse old SV */
1d7c1841 1859 sv_setsv(*itersvp, cur);
eaa5c2d6 1860 }
1c846c1f 1861 else
eaa5c2d6
GA
1862 {
1863 /* we need a fresh SV every time so that loop body sees a
1864 * completely new SV for closures/references to work as
1865 * they used to */
dc09a129 1866 oldsv = *itersvp;
1d7c1841 1867 *itersvp = newSVsv(cur);
dc09a129 1868 SvREFCNT_dec(oldsv);
eaa5c2d6 1869 }
aa07b2f6 1870 if (strEQ(SvPVX_const(cur), max))
89ea2908
GA
1871 sv_setiv(cur, 0); /* terminate next time */
1872 else
1873 sv_inc(cur);
1874 RETPUSHYES;
1875 }
1876 RETPUSHNO;
d01136d6
BS
1877 }
1878 else if (CxTYPE(cx) == CXt_LOOP_LAZYIV) {
89ea2908 1879 /* integer increment */
d01136d6 1880 if (cx->blk_loop.state_u.lazyiv.cur > cx->blk_loop.state_u.lazyiv.end)
89ea2908 1881 RETPUSHNO;
7f61b687 1882
3db8f154 1883 /* don't risk potential race */
1d7c1841 1884 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1885 /* safe to reuse old SV */
d01136d6 1886 sv_setiv(*itersvp, cx->blk_loop.state_u.lazyiv.cur++);
eaa5c2d6 1887 }
1c846c1f 1888 else
eaa5c2d6
GA
1889 {
1890 /* we need a fresh SV every time so that loop body sees a
1891 * completely new SV for closures/references to work as they
1892 * used to */
dc09a129 1893 oldsv = *itersvp;
d01136d6 1894 *itersvp = newSViv(cx->blk_loop.state_u.lazyiv.cur++);
dc09a129 1895 SvREFCNT_dec(oldsv);
eaa5c2d6 1896 }
a2309040
JH
1897
1898 /* Handle end of range at IV_MAX */
d01136d6
BS
1899 if ((cx->blk_loop.state_u.lazyiv.cur == IV_MIN) &&
1900 (cx->blk_loop.state_u.lazyiv.end == IV_MAX))
a2309040 1901 {
d01136d6
BS
1902 cx->blk_loop.state_u.lazyiv.cur++;
1903 cx->blk_loop.state_u.lazyiv.end++;
a2309040
JH
1904 }
1905
89ea2908
GA
1906 RETPUSHYES;
1907 }
1908
1909 /* iterate array */
d01136d6
BS
1910 assert(CxTYPE(cx) == CXt_LOOP_FOR);
1911 av = cx->blk_loop.state_u.ary.ary;
1912 if (!av) {
1913 av_is_stack = TRUE;
1914 av = PL_curstack;
1915 }
ef3e5ea9 1916 if (PL_op->op_private & OPpITER_REVERSED) {
d01136d6
BS
1917 if (cx->blk_loop.state_u.ary.ix <= (av_is_stack
1918 ? cx->blk_loop.resetsp + 1 : 0))
ef3e5ea9 1919 RETPUSHNO;
a0d0e21e 1920
ef3e5ea9 1921 if (SvMAGICAL(av) || AvREIFY(av)) {
d01136d6 1922 SV * const * const svp = av_fetch(av, --cx->blk_loop.state_u.ary.ix, FALSE);
a0714e2c 1923 sv = svp ? *svp : NULL;
ef3e5ea9
NC
1924 }
1925 else {
d01136d6 1926 sv = AvARRAY(av)[--cx->blk_loop.state_u.ary.ix];
ef3e5ea9 1927 }
d42935ef
JH
1928 }
1929 else {
d01136d6 1930 if (cx->blk_loop.state_u.ary.ix >= (av_is_stack ? cx->blk_oldsp :
ef3e5ea9
NC
1931 AvFILL(av)))
1932 RETPUSHNO;
1933
1934 if (SvMAGICAL(av) || AvREIFY(av)) {
d01136d6 1935 SV * const * const svp = av_fetch(av, ++cx->blk_loop.state_u.ary.ix, FALSE);
a0714e2c 1936 sv = svp ? *svp : NULL;
ef3e5ea9
NC
1937 }
1938 else {
d01136d6 1939 sv = AvARRAY(av)[++cx->blk_loop.state_u.ary.ix];
ef3e5ea9 1940 }
d42935ef 1941 }
ef3e5ea9 1942
0565a181 1943 if (sv && SvIS_FREED(sv)) {
a0714e2c 1944 *itersvp = NULL;
b6c83531 1945 Perl_croak(aTHX_ "Use of freed value in iteration");
cccede53
DM
1946 }
1947
d01136d6 1948 if (sv) {
a0d0e21e 1949 SvTEMP_off(sv);
d01136d6
BS
1950 SvREFCNT_inc_simple_void_NN(sv);
1951 }
a0d0e21e 1952 else
3280af22 1953 sv = &PL_sv_undef;
d01136d6
BS
1954 if (!av_is_stack && sv == &PL_sv_undef) {
1955 SV *lv = newSV_type(SVt_PVLV);
1956 LvTYPE(lv) = 'y';
1957 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
b37c2d43 1958 LvTARG(lv) = SvREFCNT_inc_simple(av);
d01136d6 1959 LvTARGOFF(lv) = cx->blk_loop.state_u.ary.ix;
42718184 1960 LvTARGLEN(lv) = (STRLEN)UV_MAX;
d01136d6 1961 sv = lv;
5f05dabc 1962 }
a0d0e21e 1963
dc09a129 1964 oldsv = *itersvp;
d01136d6 1965 *itersvp = sv;
dc09a129
DM
1966 SvREFCNT_dec(oldsv);
1967
a0d0e21e
LW
1968 RETPUSHYES;
1969}
1970
ef07e810
DM
1971/*
1972A description of how taint works in pattern matching and substitution.
1973
4e19c54b 1974While the pattern is being assembled/concatenated and then compiled,
0ab462a6
DM
1975PL_tainted will get set if any component of the pattern is tainted, e.g.
1976/.*$tainted/. At the end of pattern compilation, the RXf_TAINTED flag
1977is set on the pattern if PL_tainted is set.
ef07e810 1978
0ab462a6
DM
1979When the pattern is copied, e.g. $r = qr/..../, the SV holding the ref to
1980the pattern is marked as tainted. This means that subsequent usage, such
1981as /x$r/, will set PL_tainted, and thus RXf_TAINTED, on the new pattern too.
ef07e810
DM
1982
1983During execution of a pattern, locale-variant ops such as ALNUML set the
1984local flag RF_tainted. At the end of execution, the engine sets the
0ab462a6
DM
1985RXf_TAINTED_SEEN on the pattern if RF_tainted got set, or clears it
1986otherwise.
ef07e810
DM
1987
1988In addition, RXf_TAINTED_SEEN is used post-execution by the get magic code
1989of $1 et al to indicate whether the returned value should be tainted.
1990It is the responsibility of the caller of the pattern (i.e. pp_match,
1991pp_subst etc) to set this flag for any other circumstances where $1 needs
1992to be tainted.
1993
1994The taint behaviour of pp_subst (and pp_substcont) is quite complex.
1995
1996There are three possible sources of taint
1997 * the source string
1998 * the pattern (both compile- and run-time, RXf_TAINTED / RXf_TAINTED_SEEN)
1999 * the replacement string (or expression under /e)
2000
2001There are four destinations of taint and they are affected by the sources
2002according to the rules below:
2003
2004 * the return value (not including /r):
2005 tainted by the source string and pattern, but only for the
2006 number-of-iterations case; boolean returns aren't tainted;
2007 * the modified string (or modified copy under /r):
2008 tainted by the source string, pattern, and replacement strings;
2009 * $1 et al:
2010 tainted by the pattern, and under 'use re "taint"', by the source
2011 string too;
2012 * PL_taint - i.e. whether subsequent code (e.g. in a /e block) is tainted:
2013 should always be unset before executing subsequent code.
2014
2015The overall action of pp_subst is:
2016
2017 * at the start, set bits in rxtainted indicating the taint status of
2018 the various sources.
2019
2020 * After each pattern execution, update the SUBST_TAINT_PAT bit in
2021 rxtainted if RXf_TAINTED_SEEN has been set, to indicate that the
2022 pattern has subsequently become tainted via locale ops.
2023
2024 * If control is being passed to pp_substcont to execute a /e block,
2025 save rxtainted in the CXt_SUBST block, for future use by
2026 pp_substcont.
2027
2028 * Whenever control is being returned to perl code (either by falling
2029 off the "end" of pp_subst/pp_substcont, or by entering a /e block),
2030 use the flag bits in rxtainted to make all the appropriate types of
0ab462a6
DM
2031 destination taint visible; e.g. set RXf_TAINTED_SEEN so that $1
2032 et al will appear tainted.
ef07e810
DM
2033
2034pp_match is just a simpler version of the above.
2035
2036*/
2037
a0d0e21e
LW
2038PP(pp_subst)
2039{
97aff369 2040 dVAR; dSP; dTARG;
a0d0e21e
LW
2041 register PMOP *pm = cPMOP;
2042 PMOP *rpm = pm;
a0d0e21e
LW
2043 register char *s;
2044 char *strend;
2045 register char *m;
5c144d81 2046 const char *c;
a0d0e21e
LW
2047 register char *d;
2048 STRLEN clen;
2049 I32 iters = 0;
2050 I32 maxiters;
2051 register I32 i;
2052 bool once;
ef07e810
DM
2053 U8 rxtainted = 0; /* holds various SUBST_TAINT_* flag bits.
2054 See "how taint works" above */
a0d0e21e 2055 char *orig;
1ed74d04 2056 U8 r_flags;
aaa362c4 2057 register REGEXP *rx = PM_GETRE(pm);
a0d0e21e
LW
2058 STRLEN len;
2059 int force_on_match = 0;
0bcc34c2 2060 const I32 oldsave = PL_savestack_ix;
792b2c16 2061 STRLEN slen;
f272994b 2062 bool doutf8 = FALSE;
f8c7b90f 2063#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2064 bool is_cow;
2065#endif
a0714e2c 2066 SV *nsv = NULL;
b770e143
NC
2067 /* known replacement string? */
2068 register SV *dstr = (pm->op_pmflags & PMf_CONST) ? POPs : NULL;
a0d0e21e 2069
f410a211
NC
2070 PERL_ASYNC_CHECK();
2071
533c011a 2072 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 2073 TARG = POPs;
59f00321
RGS
2074 else if (PL_op->op_private & OPpTARGET_MY)
2075 GETTARGET;
a0d0e21e 2076 else {
54b9620d 2077 TARG = DEFSV;
a0d0e21e 2078 EXTEND(SP,1);
1c846c1f 2079 }
d9f424b2 2080
f8c7b90f 2081#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2082 /* Awooga. Awooga. "bool" types that are actually char are dangerous,
2083 because they make integers such as 256 "false". */
2084 is_cow = SvIsCOW(TARG) ? TRUE : FALSE;
2085#else
765f542d
NC
2086 if (SvIsCOW(TARG))
2087 sv_force_normal_flags(TARG,0);
ed252734 2088#endif
8ca8a454 2089 if (!(rpm->op_pmflags & PMf_NONDESTRUCT)
f8c7b90f 2090#ifdef PERL_OLD_COPY_ON_WRITE
8ca8a454 2091 && !is_cow
ed252734 2092#endif
8ca8a454
NC
2093 && (SvREADONLY(TARG)
2094 || ( ((SvTYPE(TARG) == SVt_PVGV && isGV_with_GP(TARG))
2095 || SvTYPE(TARG) > SVt_PVLV)
2096 && !(SvTYPE(TARG) == SVt_PVGV && SvFAKE(TARG)))))
6ad8f254 2097 Perl_croak_no_modify(aTHX);
8ec5e241
NIS
2098 PUTBACK;
2099
3e462cdc 2100 setup_match:
d5263905 2101 s = SvPV_mutable(TARG, len);
68dc0745 2102 if (!SvPOKp(TARG) || SvTYPE(TARG) == SVt_PVGV)
a0d0e21e 2103 force_on_match = 1;
20be6587
DM
2104
2105 /* only replace once? */
2106 once = !(rpm->op_pmflags & PMf_GLOBAL);
2107
ef07e810 2108 /* See "how taint works" above */
20be6587
DM
2109 if (PL_tainting) {
2110 rxtainted = (
2111 (SvTAINTED(TARG) ? SUBST_TAINT_STR : 0)
2112 | ((RX_EXTFLAGS(rx) & RXf_TAINTED) ? SUBST_TAINT_PAT : 0)
2113 | ((pm->op_pmflags & PMf_RETAINT) ? SUBST_TAINT_RETAINT : 0)
2114 | ((once && !(rpm->op_pmflags & PMf_NONDESTRUCT))
2115 ? SUBST_TAINT_BOOLRET : 0));
2116 TAINT_NOT;
2117 }
a12c0f56 2118
a30b2f1f 2119 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 2120
a0d0e21e
LW
2121 force_it:
2122 if (!pm || !s)
5637ef5b 2123 DIE(aTHX_ "panic: pp_subst, pm=%p, s=%p", pm, s);
a0d0e21e
LW
2124
2125 strend = s + len;
a30b2f1f 2126 slen = RX_MATCH_UTF8(rx) ? utf8_length((U8*)s, (U8*)strend) : len;
792b2c16
JH
2127 maxiters = 2 * slen + 10; /* We can match twice at each
2128 position, once with zero-length,
2129 second time with non-zero. */
a0d0e21e 2130
220fc49f 2131 if (!RX_PRELEN(rx) && PL_curpm) {
3280af22 2132 pm = PL_curpm;
aaa362c4 2133 rx = PM_GETRE(pm);
a0d0e21e 2134 }
07bc277f
NC
2135 r_flags = (RX_NPARENS(rx) || SvTEMP(TARG) || PL_sawampersand
2136 || (RX_EXTFLAGS(rx) & (RXf_EVAL_SEEN|RXf_PMf_KEEPCOPY)) )
ed252734 2137 ? REXEC_COPY_STR : 0;
7fba1cd6 2138
a0d0e21e 2139 orig = m = s;
07bc277f 2140 if (RX_EXTFLAGS(rx) & RXf_USE_INTUIT) {
ee0b7718 2141 PL_bostr = orig;
f9f4320a 2142 s = CALLREG_INTUIT_START(rx, TARG, s, strend, r_flags, NULL);
f722798b
IZ
2143
2144 if (!s)
df34c13a 2145 goto ret_no;
f722798b 2146 /* How to do it in subst? */
07bc277f 2147/* if ( (RX_EXTFLAGS(rx) & RXf_CHECK_ALL)
1c846c1f 2148 && !PL_sawampersand
a91cc451 2149 && !(RX_EXTFLAGS(rx) & RXf_KEEPCOPY))
f722798b
IZ
2150 goto yup;
2151*/
a0d0e21e 2152 }
71be2cbc 2153
8b64c330
DM
2154 if (!CALLREGEXEC(rx, s, strend, orig, 0, TARG, NULL,
2155 r_flags | REXEC_CHECKED))
2156 {
5e79dfb9
DM
2157 ret_no:
2158 SPAGAIN;
2159 PUSHs(rpm->op_pmflags & PMf_NONDESTRUCT ? TARG : &PL_sv_no);
2160 LEAVE_SCOPE(oldsave);
2161 RETURN;
2162 }
2163
71be2cbc 2164 /* known replacement string? */
f272994b 2165 if (dstr) {
20be6587
DM
2166 if (SvTAINTED(dstr))
2167 rxtainted |= SUBST_TAINT_REPL;
3e462cdc
KW
2168
2169 /* Upgrade the source if the replacement is utf8 but the source is not,
2170 * but only if it matched; see
2171 * http://www.nntp.perl.org/group/perl.perl5.porters/2010/04/msg158809.html
2172 */
5e79dfb9 2173 if (DO_UTF8(dstr) && ! DO_UTF8(TARG)) {
c95ca9b8
DM
2174 char * const orig_pvx = SvPVX(TARG);
2175 const STRLEN new_len = sv_utf8_upgrade_nomg(TARG);
3e462cdc
KW
2176
2177 /* If the lengths are the same, the pattern contains only
2178 * invariants, can keep going; otherwise, various internal markers
2179 * could be off, so redo */
c95ca9b8 2180 if (new_len != len || orig_pvx != SvPVX(TARG)) {
3e462cdc
KW
2181 goto setup_match;
2182 }
2183 }
2184
8514a05a
JH
2185 /* replacement needing upgrading? */
2186 if (DO_UTF8(TARG) && !doutf8) {
db79b45b 2187 nsv = sv_newmortal();
4a176938 2188 SvSetSV(nsv, dstr);
8514a05a
JH
2189 if (PL_encoding)
2190 sv_recode_to_utf8(nsv, PL_encoding);
2191 else
2192 sv_utf8_upgrade(nsv);
5c144d81 2193 c = SvPV_const(nsv, clen);
4a176938
JH
2194 doutf8 = TRUE;
2195 }
2196 else {
5c144d81 2197 c = SvPV_const(dstr, clen);
4a176938 2198 doutf8 = DO_UTF8(dstr);
8514a05a 2199 }
f272994b
A
2200 }
2201 else {
6136c704 2202 c = NULL;
f272994b
A
2203 doutf8 = FALSE;
2204 }
2205
71be2cbc 2206 /* can do inplace substitution? */
ed252734 2207 if (c
f8c7b90f 2208#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2209 && !is_cow
2210#endif
07bc277f
NC
2211 && (I32)clen <= RX_MINLENRET(rx) && (once || !(r_flags & REXEC_COPY_STR))
2212 && !(RX_EXTFLAGS(rx) & RXf_LOOKBEHIND_SEEN)
8ca8a454
NC
2213 && (!doutf8 || SvUTF8(TARG))
2214 && !(rpm->op_pmflags & PMf_NONDESTRUCT))
8b030b38 2215 {
ec911639 2216
f8c7b90f 2217#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2218 if (SvIsCOW(TARG)) {
2219 assert (!force_on_match);
2220 goto have_a_cow;
2221 }
2222#endif
71be2cbc
PP
2223 if (force_on_match) {
2224 force_on_match = 0;
2225 s = SvPV_force(TARG, len);
2226 goto force_it;
2227 }
71be2cbc 2228 d = s;
3280af22 2229 PL_curpm = pm;
71be2cbc 2230 if (once) {
20be6587
DM
2231 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2232 rxtainted |= SUBST_TAINT_PAT;
07bc277f
NC
2233 m = orig + RX_OFFS(rx)[0].start;
2234 d = orig + RX_OFFS(rx)[0].end;
71be2cbc
PP
2235 s = orig;
2236 if (m - s > strend - d) { /* faster to shorten from end */
2237 if (clen) {
2238 Copy(c, m, clen, char);
2239 m += clen;
a0d0e21e 2240 }
71be2cbc
PP
2241 i = strend - d;
2242 if (i > 0) {
2243 Move(d, m, i, char);
2244 m += i;
a0d0e21e 2245 }
71be2cbc
PP
2246 *m = '\0';
2247 SvCUR_set(TARG, m - s);
2248 }
155aba94 2249 else if ((i = m - s)) { /* faster from front */
71be2cbc
PP
2250 d -= clen;
2251 m = d;
0d3c21b0 2252 Move(s, d - i, i, char);
71be2cbc 2253 sv_chop(TARG, d-i);
71be2cbc
PP
2254 if (clen)
2255 Copy(c, m, clen, char);
2256 }
2257 else if (clen) {
2258 d -= clen;
2259 sv_chop(TARG, d);
2260 Copy(c, d, clen, char);
2261 }
2262 else {
2263 sv_chop(TARG, d);
2264 }
8ec5e241 2265 SPAGAIN;
8ca8a454 2266 PUSHs(&PL_sv_yes);
71be2cbc
PP
2267 }
2268 else {
71be2cbc
PP
2269 do {
2270 if (iters++ > maxiters)
cea2e8a9 2271 DIE(aTHX_ "Substitution loop");
20be6587
DM
2272 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2273 rxtainted |= SUBST_TAINT_PAT;
07bc277f 2274 m = RX_OFFS(rx)[0].start + orig;
155aba94 2275 if ((i = m - s)) {
71be2cbc
PP
2276 if (s != d)
2277 Move(s, d, i, char);
2278 d += i;
a0d0e21e 2279 }
71be2cbc
PP
2280 if (clen) {
2281 Copy(c, d, clen, char);
2282 d += clen;
2283 }
07bc277f 2284 s = RX_OFFS(rx)[0].end + orig;
f9f4320a 2285 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
f722798b
IZ
2286 TARG, NULL,
2287 /* don't match same null twice */
2288 REXEC_NOT_FIRST|REXEC_IGNOREPOS));
71be2cbc
PP
2289 if (s != d) {
2290 i = strend - s;
aa07b2f6 2291 SvCUR_set(TARG, d - SvPVX_const(TARG) + i);
71be2cbc 2292 Move(s, d, i+1, char); /* include the NUL */
a0d0e21e 2293 }
8ec5e241 2294 SPAGAIN;
8ca8a454 2295 mPUSHi((I32)iters);
a0d0e21e
LW
2296 }
2297 }
ff6e92e8 2298 else {
a0d0e21e
LW
2299 if (force_on_match) {
2300 force_on_match = 0;
0c1438a1
NC
2301 if (rpm->op_pmflags & PMf_NONDESTRUCT) {
2302 /* I feel that it should be possible to avoid this mortal copy
2303 given that the code below copies into a new destination.
2304 However, I suspect it isn't worth the complexity of
2305 unravelling the C<goto force_it> for the small number of
2306 cases where it would be viable to drop into the copy code. */
2307 TARG = sv_2mortal(newSVsv(TARG));
2308 }
a0d0e21e
LW
2309 s = SvPV_force(TARG, len);
2310 goto force_it;
2311 }
f8c7b90f 2312#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2313 have_a_cow:
2314#endif
20be6587
DM
2315 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
2316 rxtainted |= SUBST_TAINT_PAT;
815dd406 2317 dstr = newSVpvn_flags(m, s-m, SVs_TEMP | (DO_UTF8(TARG) ? SVf_UTF8 : 0));
3280af22 2318 PL_curpm = pm;
a0d0e21e 2319 if (!c) {
c09156bb 2320 register PERL_CONTEXT *cx;
8ec5e241 2321 SPAGAIN;
20be6587
DM
2322 /* note that a whole bunch of local vars are saved here for
2323 * use by pp_substcont: here's a list of them in case you're
2324 * searching for places in this sub that uses a particular var:
2325 * iters maxiters r_flags oldsave rxtainted orig dstr targ
2326 * s m strend rx once */
a0d0e21e 2327 PUSHSUBST(cx);
20e98b0f 2328 RETURNOP(cPMOP->op_pmreplrootu.op_pmreplroot);
a0d0e21e 2329 }
cf93c79d 2330 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
2331 do {
2332 if (iters++ > maxiters)
cea2e8a9 2333 DIE(aTHX_ "Substitution loop");
20be6587
DM
2334 if (RX_MATCH_TAINTED(rx))
2335 rxtainted |= SUBST_TAINT_PAT;
07bc277f 2336 if (RX_MATCH_COPIED(rx) && RX_SUBBEG(rx) != orig) {
a0d0e21e
LW
2337 m = s;
2338 s = orig;
07bc277f 2339 orig = RX_SUBBEG(rx);
a0d0e21e
LW
2340 s = orig + (m - s);
2341 strend = s + (strend - m);
2342 }
07bc277f 2343 m = RX_OFFS(rx)[0].start + orig;
db79b45b
JH
2344 if (doutf8 && !SvUTF8(dstr))
2345 sv_catpvn_utf8_upgrade(dstr, s, m - s, nsv);
2346 else
2347 sv_catpvn(dstr, s, m-s);
07bc277f 2348 s = RX_OFFS(rx)[0].end + orig;
a0d0e21e
LW
2349 if (clen)
2350 sv_catpvn(dstr, c, clen);
2351 if (once)
2352 break;
f9f4320a 2353 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
ffc61ed2 2354 TARG, NULL, r_flags));
db79b45b
JH
2355 if (doutf8 && !DO_UTF8(TARG))
2356 sv_catpvn_utf8_upgrade(dstr, s, strend - s, nsv);
89afcb60
A
2357 else
2358 sv_catpvn(dstr, s, strend - s);
748a9306 2359
8ca8a454
NC
2360 if (rpm->op_pmflags & PMf_NONDESTRUCT) {
2361 /* From here on down we're using the copy, and leaving the original
2362 untouched. */
2363 TARG = dstr;
2364 SPAGAIN;
2365 PUSHs(dstr);
2366 } else {
f8c7b90f 2367#ifdef PERL_OLD_COPY_ON_WRITE
8ca8a454
NC
2368 /* The match may make the string COW. If so, brilliant, because
2369 that's just saved us one malloc, copy and free - the regexp has
2370 donated the old buffer, and we malloc an entirely new one, rather
2371 than the regexp malloc()ing a buffer and copying our original,
2372 only for us to throw it away here during the substitution. */
2373 if (SvIsCOW(TARG)) {
2374 sv_force_normal_flags(TARG, SV_COW_DROP_PV);
2375 } else
ed252734 2376#endif
8ca8a454
NC
2377 {
2378 SvPV_free(TARG);
2379 }
2380 SvPV_set(TARG, SvPVX(dstr));
2381 SvCUR_set(TARG, SvCUR(dstr));
2382 SvLEN_set(TARG, SvLEN(dstr));
2383 doutf8 |= DO_UTF8(dstr);
2384 SvPV_set(dstr, NULL);
748a9306 2385
8ca8a454 2386 SPAGAIN;
4f4d7508 2387 mPUSHi((I32)iters);
8ca8a454
NC
2388 }
2389 }
2390
2391 if (!(rpm->op_pmflags & PMf_NONDESTRUCT)) {
2392 (void)SvPOK_only_UTF8(TARG);
2393 if (doutf8)
2394 SvUTF8_on(TARG);
a0d0e21e 2395 }
20be6587 2396
ef07e810 2397 /* See "how taint works" above */
20be6587
DM
2398 if (PL_tainting) {
2399 if ((rxtainted & SUBST_TAINT_PAT) ||
2400 ((rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_RETAINT)) ==
2401 (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
2402 )
2403 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
2404
2405 if (!(rxtainted & SUBST_TAINT_BOOLRET)
2406 && (rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT))
2407 )
2408 SvTAINTED_on(TOPs); /* taint return value */
2409 else
2410 SvTAINTED_off(TOPs); /* may have got tainted earlier */
2411
2412 /* needed for mg_set below */
2413 PL_tainted =
2414 cBOOL(rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL));
2415 SvTAINT(TARG);
2416 }
2417 SvSETMAGIC(TARG); /* PL_tainted must be correctly set for this mg_set */
2418 TAINT_NOT;
f1a76097
DM
2419 LEAVE_SCOPE(oldsave);
2420 RETURN;
a0d0e21e
LW
2421}
2422
2423PP(pp_grepwhile)
2424{
27da23d5 2425 dVAR; dSP;
a0d0e21e
LW
2426
2427 if (SvTRUEx(POPs))
3280af22
NIS
2428 PL_stack_base[PL_markstack_ptr[-1]++] = PL_stack_base[*PL_markstack_ptr];
2429 ++*PL_markstack_ptr;
b2a2a901 2430 FREETMPS;
d343c3ef 2431 LEAVE_with_name("grep_item"); /* exit inner scope */
a0d0e21e
LW
2432
2433 /* All done yet? */
3280af22 2434 if (PL_stack_base + *PL_markstack_ptr > SP) {
a0d0e21e 2435 I32 items;
c4420975 2436 const I32 gimme = GIMME_V;
a0d0e21e 2437
d343c3ef 2438 LEAVE_with_name("grep"); /* exit outer scope */
a0d0e21e 2439 (void)POPMARK; /* pop src */
3280af22 2440 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 2441 (void)POPMARK; /* pop dst */
3280af22 2442 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 2443 if (gimme == G_SCALAR) {
7cc47870 2444 if (PL_op->op_private & OPpGREP_LEX) {
c4420975 2445 SV* const sv = sv_newmortal();
7cc47870
RGS
2446 sv_setiv(sv, items);
2447 PUSHs(sv);
2448 }
2449 else {
2450 dTARGET;
2451 XPUSHi(items);
2452 }
a0d0e21e 2453 }
54310121
PP
2454 else if (gimme == G_ARRAY)
2455 SP += items;
a0d0e21e
LW
2456 RETURN;
2457 }
2458 else {
2459 SV *src;
2460
d343c3ef 2461 ENTER_with_name("grep_item"); /* enter inner scope */
1d7c1841 2462 SAVEVPTR(PL_curpm);
a0d0e21e 2463
3280af22 2464 src = PL_stack_base[*PL_markstack_ptr];
a0d0e21e 2465 SvTEMP_off(src);
59f00321
RGS
2466 if (PL_op->op_private & OPpGREP_LEX)
2467 PAD_SVl(PL_op->op_targ) = src;
2468 else
414bf5ae 2469 DEFSV_set(src);
a0d0e21e
LW
2470
2471 RETURNOP(cLOGOP->op_other);
2472 }
2473}
2474
2475PP(pp_leavesub)
2476{
27da23d5 2477 dVAR; dSP;
a0d0e21e
LW
2478 SV **mark;
2479 SV **newsp;
2480 PMOP *newpm;
2481 I32 gimme;
c09156bb 2482 register PERL_CONTEXT *cx;
b0d9ce38 2483 SV *sv;
a0d0e21e 2484
9850bf21
RH
2485 if (CxMULTICALL(&cxstack[cxstack_ix]))
2486 return 0;
2487
a0d0e21e 2488 POPBLOCK(cx,newpm);
5dd42e15 2489 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2490
a1f49e72 2491 TAINT_NOT;
a0d0e21e
LW
2492 if (gimme == G_SCALAR) {
2493 MARK = newsp + 1;
a29cdaf0 2494 if (MARK <= SP) {
a8bba7fa 2495 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
6f48390a
FC
2496 if (SvTEMP(TOPs) && SvREFCNT(TOPs) == 1
2497 && !SvMAGICAL(TOPs)) {
a29cdaf0
IZ
2498 *MARK = SvREFCNT_inc(TOPs);
2499 FREETMPS;
2500 sv_2mortal(*MARK);
cd06dffe
GS
2501 }
2502 else {
959e3673 2503 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
a29cdaf0 2504 FREETMPS;
959e3673
GS
2505 *MARK = sv_mortalcopy(sv);
2506 SvREFCNT_dec(sv);
a29cdaf0 2507 }
cd06dffe 2508 }
6f48390a
FC
2509 else if (SvTEMP(TOPs) && SvREFCNT(TOPs) == 1
2510 && !SvMAGICAL(TOPs)) {
767eda44 2511 *MARK = TOPs;
767eda44 2512 }
cd06dffe 2513 else
767eda44 2514 *MARK = sv_mortalcopy(TOPs);
cd06dffe
GS
2515 }
2516 else {
f86702cc 2517 MEXTEND(MARK, 0);
3280af22 2518 *MARK = &PL_sv_undef;
a0d0e21e
LW
2519 }
2520 SP = MARK;
2521 }
54310121 2522 else if (gimme == G_ARRAY) {
f86702cc 2523 for (MARK = newsp + 1; MARK <= SP; MARK++) {
6f48390a
FC
2524 if (!SvTEMP(*MARK) || SvREFCNT(*MARK) != 1
2525 || SvMAGICAL(*MARK)) {
f86702cc 2526 *MARK = sv_mortalcopy(*MARK);
a1f49e72
CS
2527 TAINT_NOT; /* Each item is independent */
2528 }
f86702cc 2529 }
a0d0e21e 2530 }
f86702cc 2531 PUTBACK;
1c846c1f 2532
a57c6685 2533 LEAVE;
5dd42e15 2534 cxstack_ix--;
b0d9ce38 2535 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
3280af22 2536 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e 2537
b0d9ce38 2538 LEAVESUB(sv);
f39bc417 2539 return cx->blk_sub.retop;
a0d0e21e
LW
2540}
2541
2542PP(pp_entersub)
2543{
27da23d5 2544 dVAR; dSP; dPOPss;
a0d0e21e 2545 GV *gv;
a0d0e21e 2546 register CV *cv;
c09156bb 2547 register PERL_CONTEXT *cx;
5d94fbed 2548 I32 gimme;
a9c4fd4e 2549 const bool hasargs = (PL_op->op_flags & OPf_STACKED) != 0;
a0d0e21e
LW
2550
2551 if (!sv)
cea2e8a9 2552 DIE(aTHX_ "Not a CODE reference");
a0d0e21e 2553 switch (SvTYPE(sv)) {
f1025168
NC
2554 /* This is overwhelming the most common case: */
2555 case SVt_PVGV:
13be902c 2556 we_have_a_glob:
159b6efe 2557 if (!(cv = GvCVu((const GV *)sv))) {
f730a42d 2558 HV *stash;
f2c0649b 2559 cv = sv_2cv(sv, &stash, &gv, 0);
f730a42d 2560 }
f1025168 2561 if (!cv) {
a57c6685 2562 ENTER;
f1025168
NC
2563 SAVETMPS;
2564 goto try_autoload;
2565 }
2566 break;
13be902c
FC
2567 case SVt_PVLV:
2568 if(isGV_with_GP(sv)) goto we_have_a_glob;
2569 /*FALLTHROUGH*/
a0d0e21e 2570 default:
7c75014e
DM
2571 if (sv == &PL_sv_yes) { /* unfound import, ignore */
2572 if (hasargs)
2573 SP = PL_stack_base + POPMARK;
4d198de3
DM
2574 else
2575 (void)POPMARK;
7c75014e
DM
2576 RETURN;
2577 }
2578 SvGETMAGIC(sv);
2579 if (SvROK(sv)) {
93d7320b
DM
2580 if (SvAMAGIC(sv)) {
2581 sv = amagic_deref_call(sv, to_cv_amg);
2582 /* Don't SPAGAIN here. */
2583 }
7c75014e
DM
2584 }
2585 else {
a9c4fd4e 2586 const char *sym;
780a5241 2587 STRLEN len;
7c75014e 2588 sym = SvPV_nomg_const(sv, len);
15ff848f 2589 if (!sym)
cea2e8a9 2590 DIE(aTHX_ PL_no_usym, "a subroutine");
533c011a 2591 if (PL_op->op_private & HINT_STRICT_REFS)
b375e37b 2592 DIE(aTHX_ "Can't use string (\"%" SVf32 "\"%s) as a subroutine ref while \"strict refs\" in use", sv, len>32 ? "..." : "");
780a5241 2593 cv = get_cvn_flags(sym, len, GV_ADD|SvUTF8(sv));
a0d0e21e
LW
2594 break;
2595 }
ea726b52 2596 cv = MUTABLE_CV(SvRV(sv));
a0d0e21e
LW
2597 if (SvTYPE(cv) == SVt_PVCV)
2598 break;
2599 /* FALL THROUGH */
2600 case SVt_PVHV:
2601 case SVt_PVAV:
cea2e8a9 2602 DIE(aTHX_ "Not a CODE reference");
f1025168 2603 /* This is the second most common case: */
a0d0e21e 2604 case SVt_PVCV:
ea726b52 2605 cv = MUTABLE_CV(sv);
a0d0e21e 2606 break;
a0d0e21e
LW
2607 }
2608
a57c6685 2609 ENTER;
a0d0e21e
LW
2610 SAVETMPS;
2611
2612 retry:
541ed3a9
FC
2613 if (CvCLONE(cv) && ! CvCLONED(cv))
2614 DIE(aTHX_ "Closure prototype called");
a0d0e21e 2615 if (!CvROOT(cv) && !CvXSUB(cv)) {
2f349aa0
NC
2616 GV* autogv;
2617 SV* sub_name;
2618
2619 /* anonymous or undef'd function leaves us no recourse */
2620 if (CvANON(cv) || !(gv = CvGV(cv)))
2621 DIE(aTHX_ "Undefined subroutine called");
2622
2623 /* autoloaded stub? */
2624 if (cv != GvCV(gv)) {
2625 cv = GvCV(gv);
2626 }
2627 /* should call AUTOLOAD now? */
2628 else {
7e623da3 2629try_autoload:
d1089224
BF
2630 if ((autogv = gv_autoload_pvn(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv),
2631 GvNAMEUTF8(gv) ? SVf_UTF8 : 0)))
2f349aa0
NC
2632 {
2633 cv = GvCV(autogv);
2634 }
2635 /* sorry */
2636 else {
2637 sub_name = sv_newmortal();
6136c704 2638 gv_efullname3(sub_name, gv, NULL);
be2597df 2639 DIE(aTHX_ "Undefined subroutine &%"SVf" called", SVfARG(sub_name));
2f349aa0
NC
2640 }
2641 }
2642 if (!cv)
2643 DIE(aTHX_ "Not a CODE reference");
2644 goto retry;
a0d0e21e
LW
2645 }
2646
54310121 2647 gimme = GIMME_V;
67caa1fe 2648 if ((PL_op->op_private & OPpENTERSUB_DB) && GvCV(PL_DBsub) && !CvNODEBUG(cv)) {
005a8a35 2649 Perl_get_db_sub(aTHX_ &sv, cv);
a9ef256d
NC
2650 if (CvISXSUB(cv))
2651 PL_curcopdb = PL_curcop;
1ad62f64 2652 if (CvLVALUE(cv)) {
2653 /* check for lsub that handles lvalue subroutines */
ae5c1e95 2654 cv = GvCV(gv_HVadd(gv_fetchpvs("DB::lsub", GV_ADDMULTI, SVt_PVHV)));
1ad62f64 2655 /* if lsub not found then fall back to DB::sub */
2656 if (!cv) cv = GvCV(PL_DBsub);
2657 } else {
2658 cv = GvCV(PL_DBsub);
2659 }
a9ef256d 2660
ccafdc96
RGS
2661 if (!cv || (!CvXSUB(cv) && !CvSTART(cv)))
2662 DIE(aTHX_ "No DB::sub routine defined");
67caa1fe 2663 }
a0d0e21e 2664
aed2304a 2665 if (!(CvISXSUB(cv))) {
f1025168 2666 /* This path taken at least 75% of the time */
a0d0e21e
LW
2667 dMARK;
2668 register I32 items = SP - MARK;
0bcc34c2 2669 AV* const padlist = CvPADLIST(cv);
a0d0e21e
LW
2670 PUSHBLOCK(cx, CXt_SUB, MARK);
2671 PUSHSUB(cx);
f39bc417 2672 cx->blk_sub.retop = PL_op->op_next;
a0d0e21e 2673 CvDEPTH(cv)++;
3a76ca88
RGS
2674 if (CvDEPTH(cv) >= 2) {
2675 PERL_STACK_OVERFLOW_CHECK();
2676 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2677 }
3a76ca88
RGS
2678 SAVECOMPPAD();
2679 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
2680 if (hasargs) {
10533ace 2681 AV *const av = MUTABLE_AV(PAD_SVl(0));
221373f0
GS
2682 if (AvREAL(av)) {
2683 /* @_ is normally not REAL--this should only ever
2684 * happen when DB::sub() calls things that modify @_ */
2685 av_clear(av);
2686 AvREAL_off(av);
2687 AvREIFY_on(av);
2688 }
3280af22 2689 cx->blk_sub.savearray = GvAV(PL_defgv);
502c6561 2690 GvAV(PL_defgv) = MUTABLE_AV(SvREFCNT_inc_simple(av));
dd2155a4 2691 CX_CURPAD_SAVE(cx->blk_sub);
6d4ff0d2 2692 cx->blk_sub.argarray = av;
a0d0e21e
LW
2693 ++MARK;
2694
2695 if (items > AvMAX(av) + 1) {
504618e9 2696 SV **ary = AvALLOC(av);
a0d0e21e
LW
2697 if (AvARRAY(av) != ary) {
2698 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
9c6bc640 2699 AvARRAY(av) = ary;
a0d0e21e
LW
2700 }
2701 if (items > AvMAX(av) + 1) {
2702 AvMAX(av) = items - 1;
2703 Renew(ary,items,SV*);
2704 AvALLOC(av) = ary;
9c6bc640 2705 AvARRAY(av) = ary;
a0d0e21e
LW
2706 }
2707 }
2708 Copy(MARK,AvARRAY(av),items,SV*);
93965878 2709 AvFILLp(av) = items - 1;
1c846c1f 2710
a0d0e21e
LW
2711 while (items--) {
2712 if (*MARK)
2713 SvTEMP_off(*MARK);
2714 MARK++;
2715 }
2716 }
da1dff94
FC
2717 if ((cx->blk_u16 & OPpENTERSUB_LVAL_MASK) == OPpLVAL_INTRO &&
2718 !CvLVALUE(cv))
2719 DIE(aTHX_ "Can't modify non-lvalue subroutine call");
4a925ff6
GS
2720 /* warning must come *after* we fully set up the context
2721 * stuff so that __WARN__ handlers can safely dounwind()
2722 * if they want to
2723 */
2b9dff67 2724 if (CvDEPTH(cv) == PERL_SUB_DEPTH_WARN && ckWARN(WARN_RECURSION)
4a925ff6
GS
2725 && !(PERLDB_SUB && cv == GvCV(PL_DBsub)))
2726 sub_crush_depth(cv);
a0d0e21e
LW
2727 RETURNOP(CvSTART(cv));
2728 }
f1025168 2729 else {
3a76ca88 2730 I32 markix = TOPMARK;
f1025168 2731
3a76ca88 2732 PUTBACK;
f1025168 2733
3a76ca88
RGS
2734 if (!hasargs) {
2735 /* Need to copy @_ to stack. Alternative may be to
2736 * switch stack to @_, and copy return values
2737 * back. This would allow popping @_ in XSUB, e.g.. XXXX */
2738 AV * const av = GvAV(PL_defgv);
2739 const I32 items = AvFILLp(av) + 1; /* @_ is not tieable */
2740
2741 if (items) {
2742 /* Mark is at the end of the stack. */
2743 EXTEND(SP, items);
2744 Copy(AvARRAY(av), SP + 1, items, SV*);
2745 SP += items;
2746 PUTBACK ;
2747 }
2748 }
2749 /* We assume first XSUB in &DB::sub is the called one. */
2750 if (PL_curcopdb) {
2751 SAVEVPTR(PL_curcop);
2752 PL_curcop = PL_curcopdb;
2753 PL_curcopdb = NULL;
2754 }
2755 /* Do we need to open block here? XXXX */
72df79cf 2756
2757 /* CvXSUB(cv) must not be NULL because newXS() refuses NULL xsub address */
2758 assert(CvXSUB(cv));
16c91539 2759 CvXSUB(cv)(aTHX_ cv);
3a76ca88
RGS
2760
2761 /* Enforce some sanity in scalar context. */
2762 if (gimme == G_SCALAR && ++markix != PL_stack_sp - PL_stack_base ) {
2763 if (markix > PL_stack_sp - PL_stack_base)
2764 *(PL_stack_base + markix) = &PL_sv_undef;
2765 else
2766 *(PL_stack_base + markix) = *PL_stack_sp;
2767 PL_stack_sp = PL_stack_base + markix;
2768 }
a57c6685 2769 LEAVE;
f1025168
NC
2770 return NORMAL;
2771 }
a0d0e21e
LW
2772}
2773
44a8e56a 2774void
864dbfa3 2775Perl_sub_crush_depth(pTHX_ CV *cv)
44a8e56a 2776{
7918f24d
NC
2777 PERL_ARGS_ASSERT_SUB_CRUSH_DEPTH;
2778
44a8e56a 2779 if (CvANON(cv))
9014280d 2780 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on anonymous subroutine");
44a8e56a 2781 else {
aec46f14 2782 SV* const tmpstr = sv_newmortal();
6136c704 2783 gv_efullname3(tmpstr, CvGV(cv), NULL);
35c1215d 2784 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on subroutine \"%"SVf"\"",
be2597df 2785 SVfARG(tmpstr));
44a8e56a
PP
2786 }
2787}
2788
a0d0e21e
LW
2789PP(pp_aelem)
2790{
97aff369 2791 dVAR; dSP;
a0d0e21e 2792 SV** svp;
a3b680e6 2793 SV* const elemsv = POPs;
d804643f 2794 IV elem = SvIV(elemsv);
502c6561 2795 AV *const av = MUTABLE_AV(POPs);
e1ec3a88
AL
2796 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
2797 const U32 defer = (PL_op->op_private & OPpLVAL_DEFER) && (elem > av_len(av));
4ad10a0b
VP
2798 const bool localizing = PL_op->op_private & OPpLVAL_INTRO;
2799 bool preeminent = TRUE;
be6c24e0 2800 SV *sv;
a0d0e21e 2801
e35c1634 2802 if (SvROK(elemsv) && !SvGAMAGIC(elemsv) && ckWARN(WARN_MISC))
95b63a38
JH
2803 Perl_warner(aTHX_ packWARN(WARN_MISC),
2804 "Use of reference \"%"SVf"\" as array index",
be2597df 2805 SVfARG(elemsv));
a0d0e21e
LW
2806 if (SvTYPE(av) != SVt_PVAV)
2807 RETPUSHUNDEF;
4ad10a0b
VP
2808
2809 if (localizing) {
2810 MAGIC *mg;
2811 HV *stash;
2812
2813 /* If we can determine whether the element exist,
2814 * Try to preserve the existenceness of a tied array
2815 * element by using EXISTS and DELETE if possible.
2816 * Fallback to FETCH and STORE otherwise. */
2817 if (SvCANEXISTDELETE(av))
2818 preeminent = av_exists(av, elem);
2819 }
2820
68dc0745 2821 svp = av_fetch(av, elem, lval && !defer);
a0d0e21e 2822 if (lval) {
2b573ace 2823#ifdef PERL_MALLOC_WRAP
2b573ace 2824 if (SvUOK(elemsv)) {
a9c4fd4e 2825 const UV uv = SvUV(elemsv);
2b573ace
JH
2826 elem = uv > IV_MAX ? IV_MAX : uv;
2827 }
2828 else if (SvNOK(elemsv))
2829 elem = (IV)SvNV(elemsv);
a3b680e6
AL
2830 if (elem > 0) {
2831 static const char oom_array_extend[] =
2832 "Out of memory during array extend"; /* Duplicated in av.c */
2b573ace 2833 MEM_WRAP_CHECK_1(elem,SV*,oom_array_extend);
a3b680e6 2834 }
2b573ace 2835#endif
3280af22 2836 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
2837 SV* lv;
2838 if (!defer)
cea2e8a9 2839 DIE(aTHX_ PL_no_aelem, elem);
68dc0745
PP
2840 lv = sv_newmortal();
2841 sv_upgrade(lv, SVt_PVLV);
2842 LvTYPE(lv) = 'y';
a0714e2c 2843 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
b37c2d43 2844 LvTARG(lv) = SvREFCNT_inc_simple(av);
68dc0745
PP
2845 LvTARGOFF(lv) = elem;
2846 LvTARGLEN(lv) = 1;
2847 PUSHs(lv);
2848 RETURN;
2849 }
4ad10a0b
VP
2850 if (localizing) {
2851 if (preeminent)
2852 save_aelem(av, elem, svp);
2853 else
2854 SAVEADELETE(av, elem);
2855 }
9026059d
GG
2856 else if (PL_op->op_private & OPpDEREF) {
2857 PUSHs(vivify_ref(*svp, PL_op->op_private & OPpDEREF));
2858 RETURN;
2859 }
a0d0e21e 2860 }
3280af22 2861 sv = (svp ? *svp : &PL_sv_undef);
39cf747a 2862 if (!lval && SvRMAGICAL(av) && SvGMAGICAL(sv)) /* see note in pp_helem() */
fd69380d 2863 mg_get(sv);
be6c24e0 2864 PUSHs(sv);
a0d0e21e
LW
2865 RETURN;
2866}
2867
9026059d 2868SV*
864dbfa3 2869Perl_vivify_ref(pTHX_ SV *sv, U32 to_what)
02a9e968 2870{
7918f24d
NC
2871 PERL_ARGS_ASSERT_VIVIFY_REF;
2872
5b295bef 2873 SvGETMAGIC(sv);
02a9e968
CS
2874 if (!SvOK(sv)) {
2875 if (SvREADONLY(sv))
6ad8f254 2876 Perl_croak_no_modify(aTHX);
43230e26 2877 prepare_SV_for_RV(sv);
68dc0745 2878 switch (to_what) {
5f05dabc 2879 case OPpDEREF_SV:
561b68a9 2880 SvRV_set(sv, newSV(0));
5f05dabc
PP
2881 break;
2882 case OPpDEREF_AV:
ad64d0ec 2883 SvRV_set(sv, MUTABLE_SV(newAV()));
5f05dabc
PP
2884 break;
2885 case OPpDEREF_HV:
ad64d0ec 2886 SvRV_set(sv, MUTABLE_SV(newHV()));
5f05dabc
PP
2887 break;
2888 }
02a9e968
CS
2889 SvROK_on(sv);
2890 SvSETMAGIC(sv);
7e482323 2891 SvGETMAGIC(sv);
02a9e968 2892 }
9026059d
GG
2893 if (SvGMAGICAL(sv)) {
2894 /* copy the sv without magic to prevent magic from being
2895 executed twice */
2896 SV* msv = sv_newmortal();
2897 sv_setsv_nomg(msv, sv);
2898 return msv;
2899 }
2900 return sv;
02a9e968
CS
2901}
2902
a0d0e21e
LW
2903PP(pp_method)
2904{
97aff369 2905 dVAR; dSP;
890ce7af 2906 SV* const sv = TOPs;
f5d5a27c
CS
2907
2908 if (SvROK(sv)) {
890ce7af 2909 SV* const rsv = SvRV(sv);
f5d5a27c
CS
2910 if (SvTYPE(rsv) == SVt_PVCV) {
2911 SETs(rsv);
2912 RETURN;
2913 }
2914 }
2915
4608196e 2916 SETs(method_common(sv, NULL));
f5d5a27c
CS
2917 RETURN;
2918}
2919
2920PP(pp_method_named)
2921{
97aff369 2922 dVAR; dSP;
890ce7af 2923 SV* const sv = cSVOP_sv;
c158a4fd 2924 U32 hash = SvSHARED_HASH(sv);
f5d5a27c
CS
2925
2926 XPUSHs(method_common(sv, &hash));
2927 RETURN;
2928}
2929
2930STATIC SV *
2931S_method_common(pTHX_ SV* meth, U32* hashp)
2932{
97aff369 2933 dVAR;
a0d0e21e
LW
2934 SV* ob;
2935 GV* gv;
56304f61 2936 HV* stash;
a0714e2c 2937 SV *packsv = NULL;
f226e9be
FC
2938 SV * const sv = PL_stack_base + TOPMARK == PL_stack_sp
2939 ? (Perl_croak(aTHX_ "Can't call method \"%"SVf"\" without a "
2940 "package or object reference", SVfARG(meth)),
2941 (SV *)NULL)
2942 : *(PL_stack_base + TOPMARK + 1);
f5d5a27c 2943
7918f24d
NC
2944 PERL_ARGS_ASSERT_METHOD_COMMON;
2945
4f1b7578 2946 if (!sv)
a214957f
VP
2947 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" on an undefined value",
2948 SVfARG(meth));
4f1b7578 2949
5b295bef 2950 SvGETMAGIC(sv);
a0d0e21e 2951 if (SvROK(sv))
ad64d0ec 2952 ob = MUTABLE_SV(SvRV(sv));
a0d0e21e
LW
2953 else {
2954 GV* iogv;
f937af42
BF
2955 STRLEN packlen;
2956 const char * packname = NULL;
da6b625f 2957 bool packname_is_utf8 = FALSE;
a0d0e21e 2958
af09ea45 2959 /* this isn't a reference */
da6b625f
FC
2960 if(SvOK(sv) && (packname = SvPV_nomg_const(sv, packlen))) {
2961 const HE* const he =
2962 (const HE *)hv_common_key_len(
2963 PL_stashcache, packname,
2964 packlen * -(packname_is_utf8 = !!SvUTF8(sv)), 0, NULL, 0
2965 );
2966
081fc587 2967 if (he) {
5e6396ae 2968 stash = INT2PTR(HV*,SvIV(HeVAL(he)));
081fc587
AB
2969 goto fetch;
2970 }
2971 }
2972
a0d0e21e 2973 if (!SvOK(sv) ||
05f5af9a 2974 !(packname) ||
da6b625f
FC
2975 !(iogv = gv_fetchpvn_flags(
2976 packname, packlen, SVf_UTF8 * packname_is_utf8, SVt_PVIO
2977 )) ||
ad64d0ec 2978 !(ob=MUTABLE_SV(GvIO(iogv))))
a0d0e21e 2979 {
af09ea45 2980 /* this isn't the name of a filehandle either */
1c846c1f 2981 if (!packname ||
fd400ab9 2982 ((UTF8_IS_START(*packname) && DO_UTF8(sv))
b86a2fa7 2983 ? !isIDFIRST_utf8((U8*)packname)
d47f310d 2984 : !isIDFIRST_L1((U8)*packname)
834a4ddd
LW
2985 ))
2986 {
d5e45555 2987 /* diag_listed_as: Can't call method "%s" without a package or object reference */
a214957f
VP
2988 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" %s",
2989 SVfARG(meth),
f5d5a27c
CS
2990 SvOK(sv) ? "without a package or object reference"
2991 : "on an undefined value");
834a4ddd 2992 }
af09ea45 2993 /* assume it's a package name */
f937af42 2994 stash = gv_stashpvn(packname, packlen, packname_is_utf8 ? SVf_UTF8 : 0);
0dae17bd
GS
2995 if (!stash)
2996 packsv = sv;
081fc587 2997 else {
d4c19fe8 2998 SV* const ref = newSViv(PTR2IV(stash));
f937af42 2999 (void)hv_store(PL_stashcache, packname,
c60dbbc3 3000 packname_is_utf8 ? -(I32)packlen : (I32)packlen, ref, 0);
7e8961ec 3001 }
ac91690f 3002 goto fetch;
a0d0e21e 3003 }
af09ea45 3004 /* it _is_ a filehandle name -- replace with a reference */
ad64d0ec 3005 *(PL_stack_base + TOPMARK + 1) = sv_2mortal(newRV(MUTABLE_SV(iogv)));
a0d0e21e
LW
3006 }
3007
af09ea45 3008 /* if we got here, ob should be a reference or a glob */
f0d43078 3009 if (!ob || !(SvOBJECT(ob)
6e592b3a
BM
3010 || (SvTYPE(ob) == SVt_PVGV
3011 && isGV_with_GP(ob)
159b6efe 3012 && (ob = MUTABLE_SV(GvIO((const GV *)ob)))
f0d43078
GS
3013 && SvOBJECT(ob))))
3014 {
b375e37b
BF
3015 Perl_croak(aTHX_ "Can't call method \"%"SVf"\" on unblessed reference",
3016 SVfARG((SvSCREAM(meth) && strEQ(SvPV_nolen_const(meth),"isa"))
3017 ? newSVpvs_flags("DOES", SVs_TEMP)
3018 : meth));
f0d43078 3019 }
a0d0e21e 3020
56304f61 3021 stash = SvSTASH(ob);
a0d0e21e 3022
ac91690f 3023 fetch:
af09ea45
IK
3024 /* NOTE: stash may be null, hope hv_fetch_ent and
3025 gv_fetchmethod can cope (it seems they can) */
3026
f5d5a27c
CS
3027 /* shortcut for simple names */
3028 if (hashp) {
b464bac0 3029 const HE* const he = hv_fetch_ent(stash, meth, 0, *hashp);
f5d5a27c 3030 if (he) {
159b6efe 3031 gv = MUTABLE_GV(HeVAL(he));
f5d5a27c 3032 if (isGV(gv) && GvCV(gv) &&
e1a479c5 3033 (!GvCVGEN(gv) || GvCVGEN(gv)
dd69841b 3034 == (PL_sub_generation + HvMROMETA(stash)->cache_gen)))
ad64d0ec 3035 return MUTABLE_SV(GvCV(gv));
f5d5a27c
CS
3036 }
3037 }
3038
f937af42
BF
3039 gv = gv_fetchmethod_sv_flags(stash ? stash : MUTABLE_HV(packsv),
3040 meth, GV_AUTOLOAD | GV_CROAK);
9b9d0b15 3041
256d1bb2 3042 assert(gv);
9b9d0b15 3043
ad64d0ec 3044 return isGV(gv) ? MUTABLE_SV(GvCV(gv)) : MUTABLE_SV(gv);
a0d0e21e 3045}
241d1a3b
NC
3046
3047/*
3048 * Local variables:
3049 * c-indentation-style: bsd
3050 * c-basic-offset: 4
14d04a33 3051 * indent-tabs-mode: nil
241d1a3b
NC
3052 * End:
3053 *
14d04a33 3054 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3055 */