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Convert some "regexp" and "struct regexp" to REGEXP where they are
[perl5.git] / pp_hot.c
CommitLineData
a0d0e21e
LW
1/* pp_hot.c
2 *
4bb101f2 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
fdf8c088 4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 by Larry Wall and others
a0d0e21e
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
9 */
10
11/*
12 * Then he heard Merry change the note, and up went the Horn-cry of Buckland,
13 * shaking the air.
14 *
15 * Awake! Awake! Fear, Fire, Foes! Awake!
16 * Fire, Foes! Awake!
17 */
18
166f8a29
DM
19/* This file contains 'hot' pp ("push/pop") functions that
20 * execute the opcodes that make up a perl program. A typical pp function
21 * expects to find its arguments on the stack, and usually pushes its
22 * results onto the stack, hence the 'pp' terminology. Each OP structure
23 * contains a pointer to the relevant pp_foo() function.
24 *
25 * By 'hot', we mean common ops whose execution speed is critical.
26 * By gathering them together into a single file, we encourage
27 * CPU cache hits on hot code. Also it could be taken as a warning not to
28 * change any code in this file unless you're sure it won't affect
29 * performance.
30 */
31
a0d0e21e 32#include "EXTERN.h"
864dbfa3 33#define PERL_IN_PP_HOT_C
a0d0e21e
LW
34#include "perl.h"
35
36/* Hot code. */
37
38PP(pp_const)
39{
97aff369 40 dVAR;
39644a26 41 dSP;
0282be92
RGS
42 if ( PL_op->op_flags & OPf_SPECIAL )
43 /* This is a const op added to hold the hints hash for
44 pp_entereval. The hash can be modified by the code
45 being eval'ed, so we return a copy instead. */
46 XPUSHs(sv_2mortal((SV*)Perl_hv_copy_hints_hv(aTHX_ (HV*)cSVOP_sv)));
47 else
48 /* Normal const. */
49 XPUSHs(cSVOP_sv);
a0d0e21e
LW
50 RETURN;
51}
52
53PP(pp_nextstate)
54{
97aff369 55 dVAR;
533c011a 56 PL_curcop = (COP*)PL_op;
a0d0e21e 57 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 58 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e
LW
59 FREETMPS;
60 return NORMAL;
61}
62
63PP(pp_gvsv)
64{
97aff369 65 dVAR;
39644a26 66 dSP;
924508f0 67 EXTEND(SP,1);
533c011a 68 if (PL_op->op_private & OPpLVAL_INTRO)
1d7c1841 69 PUSHs(save_scalar(cGVOP_gv));
a0d0e21e 70 else
c69033f2 71 PUSHs(GvSVn(cGVOP_gv));
a0d0e21e
LW
72 RETURN;
73}
74
75PP(pp_null)
76{
97aff369 77 dVAR;
a0d0e21e
LW
78 return NORMAL;
79}
80
7399586d
HS
81PP(pp_setstate)
82{
97aff369 83 dVAR;
7399586d
HS
84 PL_curcop = (COP*)PL_op;
85 return NORMAL;
86}
87
a0d0e21e
LW
88PP(pp_pushmark)
89{
97aff369 90 dVAR;
3280af22 91 PUSHMARK(PL_stack_sp);
a0d0e21e
LW
92 return NORMAL;
93}
94
95PP(pp_stringify)
96{
97aff369 97 dVAR; dSP; dTARGET;
6050d10e 98 sv_copypv(TARG,TOPs);
a0d0e21e
LW
99 SETTARG;
100 RETURN;
101}
102
103PP(pp_gv)
104{
97aff369 105 dVAR; dSP;
1d7c1841 106 XPUSHs((SV*)cGVOP_gv);
a0d0e21e
LW
107 RETURN;
108}
109
110PP(pp_and)
111{
97aff369 112 dVAR; dSP;
a0d0e21e
LW
113 if (!SvTRUE(TOPs))
114 RETURN;
115 else {
c960fc3b
SP
116 if (PL_op->op_type == OP_AND)
117 --SP;
a0d0e21e
LW
118 RETURNOP(cLOGOP->op_other);
119 }
120}
121
122PP(pp_sassign)
123{
97aff369 124 dVAR; dSP; dPOPTOPssrl;
748a9306 125
533c011a 126 if (PL_op->op_private & OPpASSIGN_BACKWARDS) {
0bd48802
AL
127 SV * const temp = left;
128 left = right; right = temp;
a0d0e21e 129 }
3280af22 130 if (PL_tainting && PL_tainted && !SvTAINTED(left))
a0d0e21e 131 TAINT_NOT;
e26df76a 132 if (PL_op->op_private & OPpASSIGN_CV_TO_GV) {
6136c704 133 SV * const cv = SvRV(left);
e26df76a
NC
134 const U32 cv_type = SvTYPE(cv);
135 const U32 gv_type = SvTYPE(right);
6136c704 136 const bool got_coderef = cv_type == SVt_PVCV || cv_type == SVt_PVFM;
e26df76a
NC
137
138 if (!got_coderef) {
139 assert(SvROK(cv));
140 }
141
ae6d515f 142 /* Can do the optimisation if right (LVALUE) is not a typeglob,
e26df76a
NC
143 left (RVALUE) is a reference to something, and we're in void
144 context. */
145 if (!got_coderef && gv_type != SVt_PVGV && GIMME_V == G_VOID) {
146 /* Is the target symbol table currently empty? */
6136c704 147 GV * const gv = gv_fetchsv(right, GV_NOINIT, SVt_PVGV);
bb112e5a 148 if (SvTYPE(gv) != SVt_PVGV && !SvOK(gv)) {
e26df76a
NC
149 /* Good. Create a new proxy constant subroutine in the target.
150 The gv becomes a(nother) reference to the constant. */
151 SV *const value = SvRV(cv);
152
4df7f6af 153 SvUPGRADE((SV *)gv, SVt_IV);
1ccdb730 154 SvPCS_IMPORTED_on(gv);
e26df76a 155 SvRV_set(gv, value);
b37c2d43 156 SvREFCNT_inc_simple_void(value);
e26df76a
NC
157 SETs(right);
158 RETURN;
159 }
160 }
161
162 /* Need to fix things up. */
163 if (gv_type != SVt_PVGV) {
164 /* Need to fix GV. */
165 right = (SV*)gv_fetchsv(right, GV_ADD, SVt_PVGV);
166 }
167
168 if (!got_coderef) {
169 /* We've been returned a constant rather than a full subroutine,
170 but they expect a subroutine reference to apply. */
53a42478
NC
171 if (SvROK(cv)) {
172 ENTER;
173 SvREFCNT_inc_void(SvRV(cv));
174 /* newCONSTSUB takes a reference count on the passed in SV
175 from us. We set the name to NULL, otherwise we get into
176 all sorts of fun as the reference to our new sub is
177 donated to the GV that we're about to assign to.
178 */
179 SvRV_set(left, (SV *)newCONSTSUB(GvSTASH(right), NULL,
e26df76a 180 SvRV(cv)));
53a42478
NC
181 SvREFCNT_dec(cv);
182 LEAVE;
183 } else {
184 /* What can happen for the corner case *{"BONK"} = \&{"BONK"};
185 is that
186 First: ops for \&{"BONK"}; return us the constant in the
187 symbol table
188 Second: ops for *{"BONK"} cause that symbol table entry
189 (and our reference to it) to be upgraded from RV
190 to typeblob)
191 Thirdly: We get here. cv is actually PVGV now, and its
192 GvCV() is actually the subroutine we're looking for
193
194 So change the reference so that it points to the subroutine
195 of that typeglob, as that's what they were after all along.
196 */
197 GV *const upgraded = (GV *) cv;
198 CV *const source = GvCV(upgraded);
199
200 assert(source);
201 assert(CvFLAGS(source) & CVf_CONST);
202
203 SvREFCNT_inc_void(source);
204 SvREFCNT_dec(upgraded);
205 SvRV_set(left, (SV *)source);
206 }
e26df76a 207 }
53a42478 208
e26df76a 209 }
54310121 210 SvSetMagicSV(right, left);
a0d0e21e
LW
211 SETs(right);
212 RETURN;
213}
214
215PP(pp_cond_expr)
216{
97aff369 217 dVAR; dSP;
a0d0e21e 218 if (SvTRUEx(POPs))
1a67a97c 219 RETURNOP(cLOGOP->op_other);
a0d0e21e 220 else
1a67a97c 221 RETURNOP(cLOGOP->op_next);
a0d0e21e
LW
222}
223
224PP(pp_unstack)
225{
97aff369 226 dVAR;
a0d0e21e
LW
227 I32 oldsave;
228 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 229 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e 230 FREETMPS;
3280af22 231 oldsave = PL_scopestack[PL_scopestack_ix - 1];
a0d0e21e
LW
232 LEAVE_SCOPE(oldsave);
233 return NORMAL;
234}
235
a0d0e21e
LW
236PP(pp_concat)
237{
97aff369 238 dVAR; dSP; dATARGET; tryAMAGICbin(concat,opASSIGN);
748a9306
LW
239 {
240 dPOPTOPssrl;
8d6d96c1
HS
241 bool lbyte;
242 STRLEN rlen;
d4c19fe8 243 const char *rpv = NULL;
a6b599c7 244 bool rbyte = FALSE;
a9c4fd4e 245 bool rcopied = FALSE;
8d6d96c1
HS
246
247 if (TARG == right && right != left) {
c75ab21a
RH
248 /* mg_get(right) may happen here ... */
249 rpv = SvPV_const(right, rlen);
250 rbyte = !DO_UTF8(right);
8d6d96c1 251 right = sv_2mortal(newSVpvn(rpv, rlen));
349d4f2f 252 rpv = SvPV_const(right, rlen); /* no point setting UTF-8 here */
db79b45b 253 rcopied = TRUE;
8d6d96c1 254 }
7889fe52 255
8d6d96c1 256 if (TARG != left) {
a9c4fd4e 257 STRLEN llen;
5c144d81 258 const char* const lpv = SvPV_const(left, llen); /* mg_get(left) may happen here */
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 }
266 else { /* TARG == left */
a9c4fd4e 267 STRLEN llen;
5b295bef 268 SvGETMAGIC(left); /* or mg_get(left) may happen here */
c75ab21a
RH
269 if (!SvOK(TARG)) {
270 if (left == right && ckWARN(WARN_UNINITIALIZED))
271 report_uninit(right);
c69006e4 272 sv_setpvn(left, "", 0);
c75ab21a 273 }
10516c54 274 (void)SvPV_nomg_const(left, llen); /* Needed to set UTF8 flag */
90f5826e
ST
275 lbyte = !DO_UTF8(left);
276 if (IN_BYTES)
277 SvUTF8_off(TARG);
8d6d96c1 278 }
a12c0f56 279
c75ab21a
RH
280 /* or mg_get(right) may happen here */
281 if (!rcopied) {
282 rpv = SvPV_const(right, rlen);
283 rbyte = !DO_UTF8(right);
284 }
8d6d96c1
HS
285 if (lbyte != rbyte) {
286 if (lbyte)
287 sv_utf8_upgrade_nomg(TARG);
288 else {
db79b45b
JH
289 if (!rcopied)
290 right = sv_2mortal(newSVpvn(rpv, rlen));
8d6d96c1 291 sv_utf8_upgrade_nomg(right);
349d4f2f 292 rpv = SvPV_const(right, rlen);
69b47968 293 }
a0d0e21e 294 }
8d6d96c1 295 sv_catpvn_nomg(TARG, rpv, rlen);
43ebc500 296
a0d0e21e
LW
297 SETTARG;
298 RETURN;
748a9306 299 }
a0d0e21e
LW
300}
301
302PP(pp_padsv)
303{
97aff369 304 dVAR; dSP; dTARGET;
a0d0e21e 305 XPUSHs(TARG);
533c011a
NIS
306 if (PL_op->op_flags & OPf_MOD) {
307 if (PL_op->op_private & OPpLVAL_INTRO)
952306ac
RGS
308 if (!(PL_op->op_private & OPpPAD_STATE))
309 SAVECLEARSV(PAD_SVl(PL_op->op_targ));
a62b51b8 310 if (PL_op->op_private & OPpDEREF) {
8ec5e241 311 PUTBACK;
dd2155a4 312 vivify_ref(PAD_SVl(PL_op->op_targ), PL_op->op_private & OPpDEREF);
8ec5e241
NIS
313 SPAGAIN;
314 }
4633a7c4 315 }
a0d0e21e
LW
316 RETURN;
317}
318
319PP(pp_readline)
320{
97aff369 321 dVAR;
f5284f61 322 tryAMAGICunTARGET(iter, 0);
3280af22 323 PL_last_in_gv = (GV*)(*PL_stack_sp--);
8efb3254 324 if (SvTYPE(PL_last_in_gv) != SVt_PVGV) {
1c846c1f 325 if (SvROK(PL_last_in_gv) && SvTYPE(SvRV(PL_last_in_gv)) == SVt_PVGV)
f5284f61 326 PL_last_in_gv = (GV*)SvRV(PL_last_in_gv);
8efb3254 327 else {
f5284f61
IZ
328 dSP;
329 XPUSHs((SV*)PL_last_in_gv);
330 PUTBACK;
cea2e8a9 331 pp_rv2gv();
f5284f61 332 PL_last_in_gv = (GV*)(*PL_stack_sp--);
f5284f61
IZ
333 }
334 }
a0d0e21e
LW
335 return do_readline();
336}
337
338PP(pp_eq)
339{
97aff369 340 dVAR; dSP; tryAMAGICbinSET(eq,0);
4c9fe80f 341#ifndef NV_PRESERVES_UV
0bdaccee 342 if (SvROK(TOPs) && !SvAMAGIC(TOPs) && SvROK(TOPm1s) && !SvAMAGIC(TOPm1s)) {
e61d22ef
NC
343 SP--;
344 SETs(boolSV(SvRV(TOPs) == SvRV(TOPp1s)));
4c9fe80f
AS
345 RETURN;
346 }
347#endif
28e5dec8
JH
348#ifdef PERL_PRESERVE_IVUV
349 SvIV_please(TOPs);
350 if (SvIOK(TOPs)) {
4c9fe80f
AS
351 /* Unless the left argument is integer in range we are going
352 to have to use NV maths. Hence only attempt to coerce the
353 right argument if we know the left is integer. */
28e5dec8
JH
354 SvIV_please(TOPm1s);
355 if (SvIOK(TOPm1s)) {
0bd48802
AL
356 const bool auvok = SvUOK(TOPm1s);
357 const bool buvok = SvUOK(TOPs);
a12c0f56 358
1605159e
NC
359 if (auvok == buvok) { /* ## IV == IV or UV == UV ## */
360 /* Casting IV to UV before comparison isn't going to matter
361 on 2s complement. On 1s complement or sign&magnitude
362 (if we have any of them) it could to make negative zero
363 differ from normal zero. As I understand it. (Need to
364 check - is negative zero implementation defined behaviour
365 anyway?). NWC */
0bd48802
AL
366 const UV buv = SvUVX(POPs);
367 const UV auv = SvUVX(TOPs);
28e5dec8 368
28e5dec8
JH
369 SETs(boolSV(auv == buv));
370 RETURN;
371 }
372 { /* ## Mixed IV,UV ## */
1605159e 373 SV *ivp, *uvp;
28e5dec8 374 IV iv;
28e5dec8 375
1605159e 376 /* == is commutative so doesn't matter which is left or right */
28e5dec8 377 if (auvok) {
1605159e
NC
378 /* top of stack (b) is the iv */
379 ivp = *SP;
380 uvp = *--SP;
381 } else {
382 uvp = *SP;
383 ivp = *--SP;
384 }
385 iv = SvIVX(ivp);
d4c19fe8 386 if (iv < 0)
1605159e
NC
387 /* As uv is a UV, it's >0, so it cannot be == */
388 SETs(&PL_sv_no);
d4c19fe8
AL
389 else
390 /* we know iv is >= 0 */
391 SETs(boolSV((UV)iv == SvUVX(uvp)));
28e5dec8
JH
392 RETURN;
393 }
394 }
395 }
396#endif
a0d0e21e 397 {
cab190d4
JD
398#if defined(NAN_COMPARE_BROKEN) && defined(Perl_isnan)
399 dPOPTOPnnrl;
400 if (Perl_isnan(left) || Perl_isnan(right))
401 RETSETNO;
402 SETs(boolSV(left == right));
403#else
a0d0e21e 404 dPOPnv;
54310121 405 SETs(boolSV(TOPn == value));
cab190d4 406#endif
a0d0e21e
LW
407 RETURN;
408 }
409}
410
411PP(pp_preinc)
412{
97aff369 413 dVAR; dSP;
f39684df 414 if (SvTYPE(TOPs) >= SVt_PVGV && SvTYPE(TOPs) != SVt_PVLV)
d470f89e 415 DIE(aTHX_ PL_no_modify);
3510b4a1
NC
416 if (!SvREADONLY(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
417 && SvIVX(TOPs) != IV_MAX)
55497cff 418 {
45977657 419 SvIV_set(TOPs, SvIVX(TOPs) + 1);
55497cff 420 SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
748a9306 421 }
28e5dec8 422 else /* Do all the PERL_PRESERVE_IVUV conditionals in sv_inc */
748a9306 423 sv_inc(TOPs);
a0d0e21e
LW
424 SvSETMAGIC(TOPs);
425 return NORMAL;
426}
427
428PP(pp_or)
429{
97aff369 430 dVAR; dSP;
a0d0e21e
LW
431 if (SvTRUE(TOPs))
432 RETURN;
433 else {
c960fc3b
SP
434 if (PL_op->op_type == OP_OR)
435 --SP;
a0d0e21e
LW
436 RETURNOP(cLOGOP->op_other);
437 }
438}
439
25a55bd7 440PP(pp_defined)
c963b151 441{
97aff369 442 dVAR; dSP;
6136c704
AL
443 register SV* sv;
444 bool defined;
25a55bd7 445 const int op_type = PL_op->op_type;
ea5195b7 446 const bool is_dor = (op_type == OP_DOR || op_type == OP_DORASSIGN);
c963b151 447
6136c704 448 if (is_dor) {
25a55bd7
SP
449 sv = TOPs;
450 if (!sv || !SvANY(sv)) {
2bd49cfc
NC
451 if (op_type == OP_DOR)
452 --SP;
25a55bd7
SP
453 RETURNOP(cLOGOP->op_other);
454 }
b7c44293
RGS
455 }
456 else {
457 /* OP_DEFINED */
25a55bd7
SP
458 sv = POPs;
459 if (!sv || !SvANY(sv))
460 RETPUSHNO;
b7c44293 461 }
25a55bd7 462
6136c704 463 defined = FALSE;
c963b151
BD
464 switch (SvTYPE(sv)) {
465 case SVt_PVAV:
466 if (AvMAX(sv) >= 0 || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 467 defined = TRUE;
c963b151
BD
468 break;
469 case SVt_PVHV:
470 if (HvARRAY(sv) || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
25a55bd7 471 defined = TRUE;
c963b151
BD
472 break;
473 case SVt_PVCV:
474 if (CvROOT(sv) || CvXSUB(sv))
25a55bd7 475 defined = TRUE;
c963b151
BD
476 break;
477 default:
5b295bef 478 SvGETMAGIC(sv);
c963b151 479 if (SvOK(sv))
25a55bd7 480 defined = TRUE;
6136c704 481 break;
c963b151 482 }
6136c704
AL
483
484 if (is_dor) {
c960fc3b
SP
485 if(defined)
486 RETURN;
487 if(op_type == OP_DOR)
488 --SP;
25a55bd7 489 RETURNOP(cLOGOP->op_other);
25a55bd7 490 }
d9aa96a4
SP
491 /* assuming OP_DEFINED */
492 if(defined)
493 RETPUSHYES;
494 RETPUSHNO;
c963b151
BD
495}
496
a0d0e21e
LW
497PP(pp_add)
498{
800401ee
JH
499 dVAR; dSP; dATARGET; bool useleft; SV *svl, *svr;
500 tryAMAGICbin(add,opASSIGN);
501 svl = sv_2num(TOPm1s);
502 svr = sv_2num(TOPs);
503 useleft = USE_LEFT(svl);
28e5dec8
JH
504#ifdef PERL_PRESERVE_IVUV
505 /* We must see if we can perform the addition with integers if possible,
506 as the integer code detects overflow while the NV code doesn't.
507 If either argument hasn't had a numeric conversion yet attempt to get
508 the IV. It's important to do this now, rather than just assuming that
509 it's not IOK as a PV of "9223372036854775806" may not take well to NV
510 addition, and an SV which is NOK, NV=6.0 ought to be coerced to
511 integer in case the second argument is IV=9223372036854775806
512 We can (now) rely on sv_2iv to do the right thing, only setting the
513 public IOK flag if the value in the NV (or PV) slot is truly integer.
514
515 A side effect is that this also aggressively prefers integer maths over
7dca457a
NC
516 fp maths for integer values.
517
a00b5bd3 518 How to detect overflow?
7dca457a
NC
519
520 C 99 section 6.2.6.1 says
521
522 The range of nonnegative values of a signed integer type is a subrange
523 of the corresponding unsigned integer type, and the representation of
524 the same value in each type is the same. A computation involving
525 unsigned operands can never overflow, because a result that cannot be
526 represented by the resulting unsigned integer type is reduced modulo
527 the number that is one greater than the largest value that can be
528 represented by the resulting type.
529
530 (the 9th paragraph)
531
532 which I read as "unsigned ints wrap."
533
534 signed integer overflow seems to be classed as "exception condition"
535
536 If an exceptional condition occurs during the evaluation of an
537 expression (that is, if the result is not mathematically defined or not
538 in the range of representable values for its type), the behavior is
539 undefined.
540
541 (6.5, the 5th paragraph)
542
543 I had assumed that on 2s complement machines signed arithmetic would
544 wrap, hence coded pp_add and pp_subtract on the assumption that
545 everything perl builds on would be happy. After much wailing and
546 gnashing of teeth it would seem that irix64 knows its ANSI spec well,
547 knows that it doesn't need to, and doesn't. Bah. Anyway, the all-
548 unsigned code below is actually shorter than the old code. :-)
549 */
550
800401ee
JH
551 SvIV_please(svr);
552 if (SvIOK(svr)) {
28e5dec8
JH
553 /* Unless the left argument is integer in range we are going to have to
554 use NV maths. Hence only attempt to coerce the right argument if
555 we know the left is integer. */
9c5ffd7c
JH
556 register UV auv = 0;
557 bool auvok = FALSE;
7dca457a
NC
558 bool a_valid = 0;
559
28e5dec8 560 if (!useleft) {
7dca457a
NC
561 auv = 0;
562 a_valid = auvok = 1;
563 /* left operand is undef, treat as zero. + 0 is identity,
564 Could SETi or SETu right now, but space optimise by not adding
565 lots of code to speed up what is probably a rarish case. */
566 } else {
567 /* Left operand is defined, so is it IV? */
800401ee
JH
568 SvIV_please(svl);
569 if (SvIOK(svl)) {
570 if ((auvok = SvUOK(svl)))
571 auv = SvUVX(svl);
7dca457a 572 else {
800401ee 573 register const IV aiv = SvIVX(svl);
7dca457a
NC
574 if (aiv >= 0) {
575 auv = aiv;
576 auvok = 1; /* Now acting as a sign flag. */
577 } else { /* 2s complement assumption for IV_MIN */
578 auv = (UV)-aiv;
579 }
580 }
581 a_valid = 1;
28e5dec8
JH
582 }
583 }
7dca457a
NC
584 if (a_valid) {
585 bool result_good = 0;
586 UV result;
587 register UV buv;
800401ee 588 bool buvok = SvUOK(svr);
a00b5bd3 589
7dca457a 590 if (buvok)
800401ee 591 buv = SvUVX(svr);
7dca457a 592 else {
800401ee 593 register const IV biv = SvIVX(svr);
7dca457a
NC
594 if (biv >= 0) {
595 buv = biv;
596 buvok = 1;
597 } else
598 buv = (UV)-biv;
599 }
600 /* ?uvok if value is >= 0. basically, flagged as UV if it's +ve,
602f51c4 601 else "IV" now, independent of how it came in.
7dca457a
NC
602 if a, b represents positive, A, B negative, a maps to -A etc
603 a + b => (a + b)
604 A + b => -(a - b)
605 a + B => (a - b)
606 A + B => -(a + b)
607 all UV maths. negate result if A negative.
608 add if signs same, subtract if signs differ. */
609
610 if (auvok ^ buvok) {
611 /* Signs differ. */
612 if (auv >= buv) {
613 result = auv - buv;
614 /* Must get smaller */
615 if (result <= auv)
616 result_good = 1;
617 } else {
618 result = buv - auv;
619 if (result <= buv) {
620 /* result really should be -(auv-buv). as its negation
621 of true value, need to swap our result flag */
622 auvok = !auvok;
623 result_good = 1;
28e5dec8
JH
624 }
625 }
7dca457a
NC
626 } else {
627 /* Signs same */
628 result = auv + buv;
629 if (result >= auv)
630 result_good = 1;
631 }
632 if (result_good) {
633 SP--;
634 if (auvok)
28e5dec8 635 SETu( result );
7dca457a
NC
636 else {
637 /* Negate result */
638 if (result <= (UV)IV_MIN)
639 SETi( -(IV)result );
640 else {
641 /* result valid, but out of range for IV. */
642 SETn( -(NV)result );
28e5dec8
JH
643 }
644 }
7dca457a
NC
645 RETURN;
646 } /* Overflow, drop through to NVs. */
28e5dec8
JH
647 }
648 }
649#endif
a0d0e21e 650 {
4efa5a16
RD
651 NV value = SvNV(svr);
652 (void)POPs;
28e5dec8
JH
653 if (!useleft) {
654 /* left operand is undef, treat as zero. + 0.0 is identity. */
655 SETn(value);
656 RETURN;
657 }
4efa5a16 658 SETn( value + SvNV(svl) );
28e5dec8 659 RETURN;
a0d0e21e
LW
660 }
661}
662
663PP(pp_aelemfast)
664{
97aff369 665 dVAR; dSP;
c445ea15 666 AV * const av = PL_op->op_flags & OPf_SPECIAL ?
6a077020 667 (AV*)PAD_SV(PL_op->op_targ) : GvAV(cGVOP_gv);
a3b680e6 668 const U32 lval = PL_op->op_flags & OPf_MOD;
0bd48802 669 SV** const svp = av_fetch(av, PL_op->op_private, lval);
3280af22 670 SV *sv = (svp ? *svp : &PL_sv_undef);
6ff81951 671 EXTEND(SP, 1);
be6c24e0
GS
672 if (!lval && SvGMAGICAL(sv)) /* see note in pp_helem() */
673 sv = sv_mortalcopy(sv);
674 PUSHs(sv);
a0d0e21e
LW
675 RETURN;
676}
677
678PP(pp_join)
679{
97aff369 680 dVAR; dSP; dMARK; dTARGET;
a0d0e21e
LW
681 MARK++;
682 do_join(TARG, *MARK, MARK, SP);
683 SP = MARK;
684 SETs(TARG);
685 RETURN;
686}
687
688PP(pp_pushre)
689{
97aff369 690 dVAR; dSP;
44a8e56a
PP
691#ifdef DEBUGGING
692 /*
693 * We ass_u_me that LvTARGOFF() comes first, and that two STRLENs
694 * will be enough to hold an OP*.
695 */
c4420975 696 SV* const sv = sv_newmortal();
44a8e56a
PP
697 sv_upgrade(sv, SVt_PVLV);
698 LvTYPE(sv) = '/';
533c011a 699 Copy(&PL_op, &LvTARGOFF(sv), 1, OP*);
44a8e56a
PP
700 XPUSHs(sv);
701#else
6b88bc9c 702 XPUSHs((SV*)PL_op);
44a8e56a 703#endif
a0d0e21e
LW
704 RETURN;
705}
706
707/* Oversized hot code. */
708
709PP(pp_print)
710{
27da23d5 711 dVAR; dSP; dMARK; dORIGMARK;
a0d0e21e 712 IO *io;
760ac839 713 register PerlIO *fp;
236988e4 714 MAGIC *mg;
0bd48802 715 GV * const gv = (PL_op->op_flags & OPf_STACKED) ? (GV*)*++MARK : PL_defoutgv;
5b468f54
AMS
716
717 if (gv && (io = GvIO(gv))
718 && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar)))
719 {
01bb7c6d 720 had_magic:
68dc0745 721 if (MARK == ORIGMARK) {
1c846c1f 722 /* If using default handle then we need to make space to
a60c0954
NIS
723 * pass object as 1st arg, so move other args up ...
724 */
4352c267 725 MEXTEND(SP, 1);
68dc0745
PP
726 ++MARK;
727 Move(MARK, MARK + 1, (SP - MARK) + 1, SV*);
728 ++SP;
729 }
730 PUSHMARK(MARK - 1);
5b468f54 731 *MARK = SvTIED_obj((SV*)io, mg);
68dc0745 732 PUTBACK;
236988e4 733 ENTER;
864dbfa3 734 call_method("PRINT", G_SCALAR);
236988e4
PP
735 LEAVE;
736 SPAGAIN;
68dc0745
PP
737 MARK = ORIGMARK + 1;
738 *MARK = *SP;
739 SP = MARK;
236988e4
PP
740 RETURN;
741 }
a0d0e21e 742 if (!(io = GvIO(gv))) {
5b468f54
AMS
743 if ((GvEGV(gv)) && (io = GvIO(GvEGV(gv)))
744 && (mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar)))
01bb7c6d 745 goto had_magic;
2dd78f96
JH
746 if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
747 report_evil_fh(gv, io, PL_op->op_type);
93189314 748 SETERRNO(EBADF,RMS_IFI);
a0d0e21e
LW
749 goto just_say_no;
750 }
751 else if (!(fp = IoOFP(io))) {
599cee73 752 if (ckWARN2(WARN_CLOSED, WARN_IO)) {
4c80c0b2
NC
753 if (IoIFP(io))
754 report_evil_fh(gv, io, OP_phoney_INPUT_ONLY);
2dd78f96 755 else if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
bc37a18f 756 report_evil_fh(gv, io, PL_op->op_type);
a0d0e21e 757 }
93189314 758 SETERRNO(EBADF,IoIFP(io)?RMS_FAC:RMS_IFI);
a0d0e21e
LW
759 goto just_say_no;
760 }
761 else {
762 MARK++;
7889fe52 763 if (PL_ofs_sv && SvOK(PL_ofs_sv)) {
a0d0e21e
LW
764 while (MARK <= SP) {
765 if (!do_print(*MARK, fp))
766 break;
767 MARK++;
768 if (MARK <= SP) {
7889fe52 769 if (!do_print(PL_ofs_sv, fp)) { /* $, */
a0d0e21e
LW
770 MARK--;
771 break;
772 }
773 }
774 }
775 }
776 else {
777 while (MARK <= SP) {
778 if (!do_print(*MARK, fp))
779 break;
780 MARK++;
781 }
782 }
783 if (MARK <= SP)
784 goto just_say_no;
785 else {
cfc4a7da
GA
786 if (PL_op->op_type == OP_SAY) {
787 if (PerlIO_write(fp, "\n", 1) == 0 || PerlIO_error(fp))
788 goto just_say_no;
789 }
790 else if (PL_ors_sv && SvOK(PL_ors_sv))
7889fe52 791 if (!do_print(PL_ors_sv, fp)) /* $\ */
a0d0e21e
LW
792 goto just_say_no;
793
794 if (IoFLAGS(io) & IOf_FLUSH)
760ac839 795 if (PerlIO_flush(fp) == EOF)
a0d0e21e
LW
796 goto just_say_no;
797 }
798 }
799 SP = ORIGMARK;
e52fd6f4 800 XPUSHs(&PL_sv_yes);
a0d0e21e
LW
801 RETURN;
802
803 just_say_no:
804 SP = ORIGMARK;
e52fd6f4 805 XPUSHs(&PL_sv_undef);
a0d0e21e
LW
806 RETURN;
807}
808
809PP(pp_rv2av)
810{
97aff369 811 dVAR; dSP; dTOPss;
cde874ca 812 const I32 gimme = GIMME_V;
17ab7946
NC
813 static const char return_array_to_lvalue_scalar[] = "Can't return array to lvalue scalar context";
814 static const char return_hash_to_lvalue_scalar[] = "Can't return hash to lvalue scalar context";
815 static const char an_array[] = "an ARRAY";
816 static const char a_hash[] = "a HASH";
817 const bool is_pp_rv2av = PL_op->op_type == OP_RV2AV;
d83b45b8 818 const svtype type = is_pp_rv2av ? SVt_PVAV : SVt_PVHV;
a0d0e21e
LW
819
820 if (SvROK(sv)) {
821 wasref:
17ab7946 822 tryAMAGICunDEREF_var(is_pp_rv2av ? to_av_amg : to_hv_amg);
f5284f61 823
17ab7946
NC
824 sv = SvRV(sv);
825 if (SvTYPE(sv) != type)
826 DIE(aTHX_ "Not %s reference", is_pp_rv2av ? an_array : a_hash);
533c011a 827 if (PL_op->op_flags & OPf_REF) {
17ab7946 828 SETs(sv);
a0d0e21e
LW
829 RETURN;
830 }
78f9721b 831 else if (LVRET) {
cde874ca 832 if (gimme != G_ARRAY)
17ab7946
NC
833 Perl_croak(aTHX_ is_pp_rv2av ? return_array_to_lvalue_scalar
834 : return_hash_to_lvalue_scalar);
835 SETs(sv);
78f9721b
SM
836 RETURN;
837 }
82d03984
RGS
838 else if (PL_op->op_flags & OPf_MOD
839 && PL_op->op_private & OPpLVAL_INTRO)
840 Perl_croak(aTHX_ PL_no_localize_ref);
a0d0e21e
LW
841 }
842 else {
17ab7946 843 if (SvTYPE(sv) == type) {
533c011a 844 if (PL_op->op_flags & OPf_REF) {
17ab7946 845 SETs(sv);
a0d0e21e
LW
846 RETURN;
847 }
78f9721b 848 else if (LVRET) {
cde874ca 849 if (gimme != G_ARRAY)
17ab7946
NC
850 Perl_croak(aTHX_
851 is_pp_rv2av ? return_array_to_lvalue_scalar
852 : return_hash_to_lvalue_scalar);
853 SETs(sv);
78f9721b
SM
854 RETURN;
855 }
a0d0e21e
LW
856 }
857 else {
67955e0c 858 GV *gv;
1c846c1f 859
a0d0e21e
LW
860 if (SvTYPE(sv) != SVt_PVGV) {
861 if (SvGMAGICAL(sv)) {
862 mg_get(sv);
863 if (SvROK(sv))
864 goto wasref;
865 }
dc3c76f8
NC
866 gv = Perl_softref2xv(aTHX_ sv, is_pp_rv2av ? an_array : a_hash,
867 type, &sp);
868 if (!gv)
869 RETURN;
35cd451c
GS
870 }
871 else {
67955e0c 872 gv = (GV*)sv;
a0d0e21e 873 }
17ab7946 874 sv = is_pp_rv2av ? (SV*)GvAVn(gv) : (SV*)GvHVn(gv);
533c011a 875 if (PL_op->op_private & OPpLVAL_INTRO)
17ab7946 876 sv = is_pp_rv2av ? (SV*)save_ary(gv) : (SV*)save_hash(gv);
533c011a 877 if (PL_op->op_flags & OPf_REF) {
17ab7946 878 SETs(sv);
a0d0e21e
LW
879 RETURN;
880 }
78f9721b 881 else if (LVRET) {
cde874ca 882 if (gimme != G_ARRAY)
17ab7946
NC
883 Perl_croak(aTHX_
884 is_pp_rv2av ? return_array_to_lvalue_scalar
885 : return_hash_to_lvalue_scalar);
886 SETs(sv);
78f9721b
SM
887 RETURN;
888 }
a0d0e21e
LW
889 }
890 }
891
17ab7946
NC
892 if (is_pp_rv2av) {
893 AV *const av = (AV*)sv;
894 /* The guts of pp_rv2av, with no intenting change to preserve history
895 (until such time as we get tools that can do blame annotation across
896 whitespace changes. */
cde874ca 897 if (gimme == G_ARRAY) {
a3b680e6 898 const I32 maxarg = AvFILL(av) + 1;
c2444246 899 (void)POPs; /* XXXX May be optimized away? */
1c846c1f 900 EXTEND(SP, maxarg);
93965878 901 if (SvRMAGICAL(av)) {
1c846c1f 902 U32 i;
eb160463 903 for (i=0; i < (U32)maxarg; i++) {
0bcc34c2 904 SV ** const svp = av_fetch(av, i, FALSE);
547d1dd8
HS
905 /* See note in pp_helem, and bug id #27839 */
906 SP[i+1] = svp
907 ? SvGMAGICAL(*svp) ? sv_mortalcopy(*svp) : *svp
908 : &PL_sv_undef;
93965878 909 }
1c846c1f 910 }
93965878
NIS
911 else {
912 Copy(AvARRAY(av), SP+1, maxarg, SV*);
913 }
a0d0e21e
LW
914 SP += maxarg;
915 }
cde874ca 916 else if (gimme == G_SCALAR) {
a0d0e21e 917 dTARGET;
a3b680e6 918 const I32 maxarg = AvFILL(av) + 1;
f5284f61 919 SETi(maxarg);
a0d0e21e 920 }
17ab7946
NC
921 } else {
922 /* The guts of pp_rv2hv */
be85d344 923 if (gimme == G_ARRAY) { /* array wanted */
17ab7946 924 *PL_stack_sp = sv;
cea2e8a9 925 return do_kv();
a0d0e21e 926 }
be85d344 927 else if (gimme == G_SCALAR) {
a0d0e21e 928 dTARGET;
17ab7946 929 TARG = Perl_hv_scalar(aTHX_ (HV*)sv);
5e17dd7d 930 SPAGAIN;
a0d0e21e 931 SETTARG;
a0d0e21e 932 }
17ab7946 933 }
be85d344 934 RETURN;
a0d0e21e
LW
935}
936
10c8fecd
GS
937STATIC void
938S_do_oddball(pTHX_ HV *hash, SV **relem, SV **firstrelem)
939{
97aff369 940 dVAR;
10c8fecd
GS
941 if (*relem) {
942 SV *tmpstr;
b464bac0 943 const HE *didstore;
6d822dc4
MS
944
945 if (ckWARN(WARN_MISC)) {
a3b680e6 946 const char *err;
10c8fecd
GS
947 if (relem == firstrelem &&
948 SvROK(*relem) &&
949 (SvTYPE(SvRV(*relem)) == SVt_PVAV ||
950 SvTYPE(SvRV(*relem)) == SVt_PVHV))
951 {
a3b680e6 952 err = "Reference found where even-sized list expected";
10c8fecd
GS
953 }
954 else
a3b680e6
AL
955 err = "Odd number of elements in hash assignment";
956 Perl_warner(aTHX_ packWARN(WARN_MISC), err);
10c8fecd 957 }
6d822dc4 958
561b68a9 959 tmpstr = newSV(0);
6d822dc4
MS
960 didstore = hv_store_ent(hash,*relem,tmpstr,0);
961 if (SvMAGICAL(hash)) {
962 if (SvSMAGICAL(tmpstr))
963 mg_set(tmpstr);
964 if (!didstore)
965 sv_2mortal(tmpstr);
966 }
967 TAINT_NOT;
10c8fecd
GS
968 }
969}
970
a0d0e21e
LW
971PP(pp_aassign)
972{
27da23d5 973 dVAR; dSP;
3280af22
NIS
974 SV **lastlelem = PL_stack_sp;
975 SV **lastrelem = PL_stack_base + POPMARK;
976 SV **firstrelem = PL_stack_base + POPMARK + 1;
a0d0e21e
LW
977 SV **firstlelem = lastrelem + 1;
978
979 register SV **relem;
980 register SV **lelem;
981
982 register SV *sv;
983 register AV *ary;
984
54310121 985 I32 gimme;
a0d0e21e
LW
986 HV *hash;
987 I32 i;
988 int magic;
ca65944e 989 int duplicates = 0;
cbbf8932 990 SV **firsthashrelem = NULL; /* "= 0" keeps gcc 2.95 quiet */
5637b936 991
3280af22 992 PL_delaymagic = DM_DELAY; /* catch simultaneous items */
ca65944e 993 gimme = GIMME_V;
a0d0e21e
LW
994
995 /* If there's a common identifier on both sides we have to take
996 * special care that assigning the identifier on the left doesn't
997 * clobber a value on the right that's used later in the list.
998 */
10c8fecd 999 if (PL_op->op_private & (OPpASSIGN_COMMON)) {
cc5e57d2 1000 EXTEND_MORTAL(lastrelem - firstrelem + 1);
10c8fecd 1001 for (relem = firstrelem; relem <= lastrelem; relem++) {
155aba94 1002 if ((sv = *relem)) {
a1f49e72 1003 TAINT_NOT; /* Each item is independent */
10c8fecd 1004 *relem = sv_mortalcopy(sv);
a1f49e72 1005 }
10c8fecd 1006 }
a0d0e21e
LW
1007 }
1008
1009 relem = firstrelem;
1010 lelem = firstlelem;
4608196e
RGS
1011 ary = NULL;
1012 hash = NULL;
10c8fecd 1013
a0d0e21e 1014 while (lelem <= lastlelem) {
bbce6d69 1015 TAINT_NOT; /* Each item stands on its own, taintwise. */
a0d0e21e
LW
1016 sv = *lelem++;
1017 switch (SvTYPE(sv)) {
1018 case SVt_PVAV:
1019 ary = (AV*)sv;
748a9306 1020 magic = SvMAGICAL(ary) != 0;
a0d0e21e 1021 av_clear(ary);
7e42bd57 1022 av_extend(ary, lastrelem - relem);
a0d0e21e
LW
1023 i = 0;
1024 while (relem <= lastrelem) { /* gobble up all the rest */
5117ca91 1025 SV **didstore;
a0d0e21e 1026 assert(*relem);
f2b990bf 1027 sv = newSVsv(*relem);
a0d0e21e 1028 *(relem++) = sv;
5117ca91
GS
1029 didstore = av_store(ary,i++,sv);
1030 if (magic) {
fb73857a
PP
1031 if (SvSMAGICAL(sv))
1032 mg_set(sv);
5117ca91 1033 if (!didstore)
8127e0e3 1034 sv_2mortal(sv);
5117ca91 1035 }
bbce6d69 1036 TAINT_NOT;
a0d0e21e 1037 }
934dcd01
RD
1038 if (PL_delaymagic & DM_ARRAY)
1039 SvSETMAGIC((SV*)ary);
a0d0e21e 1040 break;
10c8fecd 1041 case SVt_PVHV: { /* normal hash */
a0d0e21e
LW
1042 SV *tmpstr;
1043
1044 hash = (HV*)sv;
748a9306 1045 magic = SvMAGICAL(hash) != 0;
a0d0e21e 1046 hv_clear(hash);
ca65944e 1047 firsthashrelem = relem;
a0d0e21e
LW
1048
1049 while (relem < lastrelem) { /* gobble up all the rest */
5117ca91 1050 HE *didstore;
6136c704
AL
1051 sv = *relem ? *relem : &PL_sv_no;
1052 relem++;
561b68a9 1053 tmpstr = newSV(0);
a0d0e21e
LW
1054 if (*relem)
1055 sv_setsv(tmpstr,*relem); /* value */
1056 *(relem++) = tmpstr;
ca65944e
RGS
1057 if (gimme != G_VOID && hv_exists_ent(hash, sv, 0))
1058 /* key overwrites an existing entry */
1059 duplicates += 2;
5117ca91
GS
1060 didstore = hv_store_ent(hash,sv,tmpstr,0);
1061 if (magic) {
fb73857a
PP
1062 if (SvSMAGICAL(tmpstr))
1063 mg_set(tmpstr);
5117ca91 1064 if (!didstore)
8127e0e3 1065 sv_2mortal(tmpstr);
5117ca91 1066 }
bbce6d69 1067 TAINT_NOT;
8e07c86e 1068 }
6a0deba8 1069 if (relem == lastrelem) {
10c8fecd 1070 do_oddball(hash, relem, firstrelem);
6a0deba8 1071 relem++;
1930e939 1072 }
a0d0e21e
LW
1073 }
1074 break;
1075 default:
6fc92669
GS
1076 if (SvIMMORTAL(sv)) {
1077 if (relem <= lastrelem)
1078 relem++;
1079 break;
a0d0e21e
LW
1080 }
1081 if (relem <= lastrelem) {
1082 sv_setsv(sv, *relem);
1083 *(relem++) = sv;
1084 }
1085 else
3280af22 1086 sv_setsv(sv, &PL_sv_undef);
a0d0e21e
LW
1087 SvSETMAGIC(sv);
1088 break;
1089 }
1090 }
3280af22
NIS
1091 if (PL_delaymagic & ~DM_DELAY) {
1092 if (PL_delaymagic & DM_UID) {
a0d0e21e 1093#ifdef HAS_SETRESUID
fb934a90
RD
1094 (void)setresuid((PL_delaymagic & DM_RUID) ? PL_uid : (Uid_t)-1,
1095 (PL_delaymagic & DM_EUID) ? PL_euid : (Uid_t)-1,
1096 (Uid_t)-1);
56febc5e
AD
1097#else
1098# ifdef HAS_SETREUID
fb934a90
RD
1099 (void)setreuid((PL_delaymagic & DM_RUID) ? PL_uid : (Uid_t)-1,
1100 (PL_delaymagic & DM_EUID) ? PL_euid : (Uid_t)-1);
56febc5e
AD
1101# else
1102# ifdef HAS_SETRUID
b28d0864
NIS
1103 if ((PL_delaymagic & DM_UID) == DM_RUID) {
1104 (void)setruid(PL_uid);
1105 PL_delaymagic &= ~DM_RUID;
a0d0e21e 1106 }
56febc5e
AD
1107# endif /* HAS_SETRUID */
1108# ifdef HAS_SETEUID
b28d0864 1109 if ((PL_delaymagic & DM_UID) == DM_EUID) {
fb934a90 1110 (void)seteuid(PL_euid);
b28d0864 1111 PL_delaymagic &= ~DM_EUID;
a0d0e21e 1112 }
56febc5e 1113# endif /* HAS_SETEUID */
b28d0864
NIS
1114 if (PL_delaymagic & DM_UID) {
1115 if (PL_uid != PL_euid)
cea2e8a9 1116 DIE(aTHX_ "No setreuid available");
b28d0864 1117 (void)PerlProc_setuid(PL_uid);
a0d0e21e 1118 }
56febc5e
AD
1119# endif /* HAS_SETREUID */
1120#endif /* HAS_SETRESUID */
d8eceb89
JH
1121 PL_uid = PerlProc_getuid();
1122 PL_euid = PerlProc_geteuid();
a0d0e21e 1123 }
3280af22 1124 if (PL_delaymagic & DM_GID) {
a0d0e21e 1125#ifdef HAS_SETRESGID
fb934a90
RD
1126 (void)setresgid((PL_delaymagic & DM_RGID) ? PL_gid : (Gid_t)-1,
1127 (PL_delaymagic & DM_EGID) ? PL_egid : (Gid_t)-1,
1128 (Gid_t)-1);
56febc5e
AD
1129#else
1130# ifdef HAS_SETREGID
fb934a90
RD
1131 (void)setregid((PL_delaymagic & DM_RGID) ? PL_gid : (Gid_t)-1,
1132 (PL_delaymagic & DM_EGID) ? PL_egid : (Gid_t)-1);
56febc5e
AD
1133# else
1134# ifdef HAS_SETRGID
b28d0864
NIS
1135 if ((PL_delaymagic & DM_GID) == DM_RGID) {
1136 (void)setrgid(PL_gid);
1137 PL_delaymagic &= ~DM_RGID;
a0d0e21e 1138 }
56febc5e
AD
1139# endif /* HAS_SETRGID */
1140# ifdef HAS_SETEGID
b28d0864 1141 if ((PL_delaymagic & DM_GID) == DM_EGID) {
fb934a90 1142 (void)setegid(PL_egid);
b28d0864 1143 PL_delaymagic &= ~DM_EGID;
a0d0e21e 1144 }
56febc5e 1145# endif /* HAS_SETEGID */
b28d0864
NIS
1146 if (PL_delaymagic & DM_GID) {
1147 if (PL_gid != PL_egid)
cea2e8a9 1148 DIE(aTHX_ "No setregid available");
b28d0864 1149 (void)PerlProc_setgid(PL_gid);
a0d0e21e 1150 }
56febc5e
AD
1151# endif /* HAS_SETREGID */
1152#endif /* HAS_SETRESGID */
d8eceb89
JH
1153 PL_gid = PerlProc_getgid();
1154 PL_egid = PerlProc_getegid();
a0d0e21e 1155 }
3280af22 1156 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
a0d0e21e 1157 }
3280af22 1158 PL_delaymagic = 0;
54310121 1159
54310121
PP
1160 if (gimme == G_VOID)
1161 SP = firstrelem - 1;
1162 else if (gimme == G_SCALAR) {
1163 dTARGET;
1164 SP = firstrelem;
ca65944e 1165 SETi(lastrelem - firstrelem + 1 - duplicates);
54310121
PP
1166 }
1167 else {
ca65944e 1168 if (ary)
a0d0e21e 1169 SP = lastrelem;
ca65944e
RGS
1170 else if (hash) {
1171 if (duplicates) {
1172 /* Removes from the stack the entries which ended up as
1173 * duplicated keys in the hash (fix for [perl #24380]) */
1174 Move(firsthashrelem + duplicates,
1175 firsthashrelem, duplicates, SV**);
1176 lastrelem -= duplicates;
1177 }
1178 SP = lastrelem;
1179 }
a0d0e21e
LW
1180 else
1181 SP = firstrelem + (lastlelem - firstlelem);
0c8c7a05 1182 lelem = firstlelem + (relem - firstrelem);
5f05dabc 1183 while (relem <= SP)
3280af22 1184 *relem++ = (lelem <= lastlelem) ? *lelem++ : &PL_sv_undef;
a0d0e21e 1185 }
08aeb9f7 1186
54310121 1187 RETURN;
a0d0e21e
LW
1188}
1189
8782bef2
GB
1190PP(pp_qr)
1191{
97aff369 1192 dVAR; dSP;
c4420975 1193 register PMOP * const pm = cPMOP;
fe578d7f 1194 REGEXP * rx = PM_GETRE(pm);
49d7dfbc 1195 SV * const pkg = CALLREG_PACKAGE(rx);
c4420975 1196 SV * const rv = sv_newmortal();
5c35adbb 1197 SV * const sv = newSVrv(rv, pkg ? SvPV_nolen(pkg) : NULL);
07bc277f 1198 if (RX_EXTFLAGS(rx) & RXf_TAINTED)
e08e52cf 1199 SvTAINTED_on(rv);
5c35adbb
NC
1200 sv_upgrade(sv, SVt_REGEXP);
1201 ((struct xregexp *)SvANY(sv))->xrx_regexp = ReREFCNT_inc(rx);
c8c13c22 1202 XPUSHs(rv);
1203 RETURN;
8782bef2
GB
1204}
1205
a0d0e21e
LW
1206PP(pp_match)
1207{
97aff369 1208 dVAR; dSP; dTARG;
a0d0e21e 1209 register PMOP *pm = cPMOP;
d65afb4b 1210 PMOP *dynpm = pm;
0d46e09a
SP
1211 register const char *t;
1212 register const char *s;
5c144d81 1213 const char *strend;
a0d0e21e 1214 I32 global;
f722798b 1215 I32 r_flags = REXEC_CHECKED;
5c144d81 1216 const char *truebase; /* Start of string */
aaa362c4 1217 register REGEXP *rx = PM_GETRE(pm);
b3eb6a9b 1218 bool rxtainted;
a3b680e6 1219 const I32 gimme = GIMME;
a0d0e21e 1220 STRLEN len;
748a9306 1221 I32 minmatch = 0;
a3b680e6 1222 const I32 oldsave = PL_savestack_ix;
f86702cc 1223 I32 update_minmatch = 1;
e60df1fa 1224 I32 had_zerolen = 0;
58e23c8d 1225 U32 gpos = 0;
a0d0e21e 1226
533c011a 1227 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 1228 TARG = POPs;
59f00321
RGS
1229 else if (PL_op->op_private & OPpTARGET_MY)
1230 GETTARGET;
a0d0e21e 1231 else {
54b9620d 1232 TARG = DEFSV;
a0d0e21e
LW
1233 EXTEND(SP,1);
1234 }
d9f424b2 1235
c277df42 1236 PUTBACK; /* EVAL blocks need stack_sp. */
5c144d81 1237 s = SvPV_const(TARG, len);
a0d0e21e 1238 if (!s)
2269b42e 1239 DIE(aTHX_ "panic: pp_match");
890ce7af 1240 strend = s + len;
07bc277f 1241 rxtainted = ((RX_EXTFLAGS(rx) & RXf_TAINTED) ||
3280af22 1242 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
9212bbba 1243 TAINT_NOT;
a0d0e21e 1244
a30b2f1f 1245 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 1246
d65afb4b 1247 /* PMdf_USED is set after a ?? matches once */
c737faaf
YO
1248 if (
1249#ifdef USE_ITHREADS
1250 SvREADONLY(PL_regex_pad[pm->op_pmoffset])
1251#else
1252 pm->op_pmflags & PMf_USED
1253#endif
1254 ) {
c277df42 1255 failure:
a0d0e21e
LW
1256 if (gimme == G_ARRAY)
1257 RETURN;
1258 RETPUSHNO;
1259 }
1260
c737faaf
YO
1261
1262
d65afb4b 1263 /* empty pattern special-cased to use last successful pattern if possible */
220fc49f 1264 if (!RX_PRELEN(rx) && PL_curpm) {
3280af22 1265 pm = PL_curpm;
aaa362c4 1266 rx = PM_GETRE(pm);
a0d0e21e 1267 }
d65afb4b 1268
07bc277f 1269 if (RX_MINLEN(rx) > (I32)len)
d65afb4b 1270 goto failure;
c277df42 1271
a0d0e21e 1272 truebase = t = s;
ad94a511
IZ
1273
1274 /* XXXX What part of this is needed with true \G-support? */
d65afb4b 1275 if ((global = dynpm->op_pmflags & PMf_GLOBAL)) {
07bc277f 1276 RX_OFFS(rx)[0].start = -1;
a0d0e21e 1277 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
c445ea15 1278 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
565764a8 1279 if (mg && mg->mg_len >= 0) {
07bc277f
NC
1280 if (!(RX_EXTFLAGS(rx) & RXf_GPOS_SEEN))
1281 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1282 else if (RX_EXTFLAGS(rx) & RXf_ANCH_GPOS) {
0ef3e39e 1283 r_flags |= REXEC_IGNOREPOS;
07bc277f
NC
1284 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1285 } else if (RX_EXTFLAGS(rx) & RXf_GPOS_FLOAT)
58e23c8d
YO
1286 gpos = mg->mg_len;
1287 else
07bc277f
NC
1288 RX_OFFS(rx)[0].end = RX_OFFS(rx)[0].start = mg->mg_len;
1289 minmatch = (mg->mg_flags & MGf_MINMATCH) ? RX_GOFS(rx) + 1 : 0;
f86702cc 1290 update_minmatch = 0;
748a9306 1291 }
a0d0e21e
LW
1292 }
1293 }
a229a030 1294 /* XXX: comment out !global get safe $1 vars after a
62e7980d 1295 match, BUT be aware that this leads to dramatic slowdowns on
a229a030
YO
1296 /g matches against large strings. So far a solution to this problem
1297 appears to be quite tricky.
1298 Test for the unsafe vars are TODO for now. */
07bc277f 1299 if (( !global && RX_NPARENS(rx))
cde0cee5 1300 || SvTEMP(TARG) || PL_sawampersand ||
07bc277f 1301 (RX_EXTFLAGS(rx) & (RXf_EVAL_SEEN|RXf_PMf_KEEPCOPY)))
14977893 1302 r_flags |= REXEC_COPY_STR;
1c846c1f 1303 if (SvSCREAM(TARG))
22e551b9
IZ
1304 r_flags |= REXEC_SCREAM;
1305
a0d0e21e 1306play_it_again:
07bc277f
NC
1307 if (global && RX_OFFS(rx)[0].start != -1) {
1308 t = s = RX_OFFS(rx)[0].end + truebase - RX_GOFS(rx);
1309 if ((s + RX_MINLEN(rx)) > strend || s < truebase)
a0d0e21e 1310 goto nope;
f86702cc 1311 if (update_minmatch++)
e60df1fa 1312 minmatch = had_zerolen;
a0d0e21e 1313 }
07bc277f
NC
1314 if (RX_EXTFLAGS(rx) & RXf_USE_INTUIT &&
1315 DO_UTF8(TARG) == ((RX_EXTFLAGS(rx) & RXf_UTF8) != 0)) {
5c144d81
NC
1316 /* FIXME - can PL_bostr be made const char *? */
1317 PL_bostr = (char *)truebase;
f9f4320a 1318 s = CALLREG_INTUIT_START(rx, TARG, (char *)s, (char *)strend, r_flags, NULL);
f722798b
IZ
1319
1320 if (!s)
1321 goto nope;
07bc277f 1322 if ( (RX_EXTFLAGS(rx) & RXf_CHECK_ALL)
14977893 1323 && !PL_sawampersand
07bc277f
NC
1324 && !(RX_EXTFLAGS(rx) & RXf_PMf_KEEPCOPY)
1325 && ((RX_EXTFLAGS(rx) & RXf_NOSCAN)
1326 || !((RX_EXTFLAGS(rx) & RXf_INTUIT_TAIL)
05b4157f
GS
1327 && (r_flags & REXEC_SCREAM)))
1328 && !SvROK(TARG)) /* Cannot trust since INTUIT cannot guess ^ */
f722798b 1329 goto yup;
a0d0e21e 1330 }
1f36f092
RB
1331 if (CALLREGEXEC(rx, (char*)s, (char *)strend, (char*)truebase,
1332 minmatch, TARG, NUM2PTR(void*, gpos), r_flags))
bbce6d69 1333 {
3280af22 1334 PL_curpm = pm;
c737faaf
YO
1335 if (dynpm->op_pmflags & PMf_ONCE) {
1336#ifdef USE_ITHREADS
1337 SvREADONLY_on(PL_regex_pad[dynpm->op_pmoffset]);
1338#else
1339 dynpm->op_pmflags |= PMf_USED;
1340#endif
1341 }
a0d0e21e
LW
1342 goto gotcha;
1343 }
1344 else
1345 goto ret_no;
1346 /*NOTREACHED*/
1347
1348 gotcha:
72311751
GS
1349 if (rxtainted)
1350 RX_MATCH_TAINTED_on(rx);
1351 TAINT_IF(RX_MATCH_TAINTED(rx));
a0d0e21e 1352 if (gimme == G_ARRAY) {
07bc277f 1353 const I32 nparens = RX_NPARENS(rx);
a3b680e6 1354 I32 i = (global && !nparens) ? 1 : 0;
a0d0e21e 1355
c277df42 1356 SPAGAIN; /* EVAL blocks could move the stack. */
ffc61ed2
JH
1357 EXTEND(SP, nparens + i);
1358 EXTEND_MORTAL(nparens + i);
1359 for (i = !i; i <= nparens; i++) {
a0d0e21e 1360 PUSHs(sv_newmortal());
07bc277f
NC
1361 if ((RX_OFFS(rx)[i].start != -1) && RX_OFFS(rx)[i].end != -1 ) {
1362 const I32 len = RX_OFFS(rx)[i].end - RX_OFFS(rx)[i].start;
1363 s = RX_OFFS(rx)[i].start + truebase;
1364 if (RX_OFFS(rx)[i].end < 0 || RX_OFFS(rx)[i].start < 0 ||
290deeac
A
1365 len < 0 || len > strend - s)
1366 DIE(aTHX_ "panic: pp_match start/end pointers");
a0d0e21e 1367 sv_setpvn(*SP, s, len);
cce850e4 1368 if (DO_UTF8(TARG) && is_utf8_string((U8*)s, len))
a197cbdd 1369 SvUTF8_on(*SP);
a0d0e21e
LW
1370 }
1371 }
1372 if (global) {
d65afb4b 1373 if (dynpm->op_pmflags & PMf_CONTINUE) {
6136c704 1374 MAGIC* mg = NULL;
0af80b60
HS
1375 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
1376 mg = mg_find(TARG, PERL_MAGIC_regex_global);
1377 if (!mg) {
d83f0a82
NC
1378#ifdef PERL_OLD_COPY_ON_WRITE
1379 if (SvIsCOW(TARG))
1380 sv_force_normal_flags(TARG, 0);
1381#endif
1382 mg = sv_magicext(TARG, NULL, PERL_MAGIC_regex_global,
1383 &PL_vtbl_mglob, NULL, 0);
0af80b60 1384 }
07bc277f
NC
1385 if (RX_OFFS(rx)[0].start != -1) {
1386 mg->mg_len = RX_OFFS(rx)[0].end;
1387 if (RX_OFFS(rx)[0].start + RX_GOFS(rx) == (UV)RX_OFFS(rx)[0].end)
0af80b60
HS
1388 mg->mg_flags |= MGf_MINMATCH;
1389 else
1390 mg->mg_flags &= ~MGf_MINMATCH;
1391 }
1392 }
07bc277f
NC
1393 had_zerolen = (RX_OFFS(rx)[0].start != -1
1394 && (RX_OFFS(rx)[0].start + RX_GOFS(rx)
1395 == (UV)RX_OFFS(rx)[0].end));
c277df42 1396 PUTBACK; /* EVAL blocks may use stack */
cf93c79d 1397 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
1398 goto play_it_again;
1399 }
ffc61ed2 1400 else if (!nparens)
bde848c5 1401 XPUSHs(&PL_sv_yes);
4633a7c4 1402 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1403 RETURN;
1404 }
1405 else {
1406 if (global) {
cbbf8932 1407 MAGIC* mg;
a0d0e21e 1408 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
14befaf4 1409 mg = mg_find(TARG, PERL_MAGIC_regex_global);
cbbf8932
AL
1410 else
1411 mg = NULL;
a0d0e21e 1412 if (!mg) {
d83f0a82
NC
1413#ifdef PERL_OLD_COPY_ON_WRITE
1414 if (SvIsCOW(TARG))
1415 sv_force_normal_flags(TARG, 0);
1416#endif
1417 mg = sv_magicext(TARG, NULL, PERL_MAGIC_regex_global,
1418 &PL_vtbl_mglob, NULL, 0);
a0d0e21e 1419 }
07bc277f
NC
1420 if (RX_OFFS(rx)[0].start != -1) {
1421 mg->mg_len = RX_OFFS(rx)[0].end;
1422 if (RX_OFFS(rx)[0].start + RX_GOFS(rx) == (UV)RX_OFFS(rx)[0].end)
748a9306
LW
1423 mg->mg_flags |= MGf_MINMATCH;
1424 else
1425 mg->mg_flags &= ~MGf_MINMATCH;
1426 }
a0d0e21e 1427 }
4633a7c4 1428 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1429 RETPUSHYES;
1430 }
1431
f722798b 1432yup: /* Confirmed by INTUIT */
72311751
GS
1433 if (rxtainted)
1434 RX_MATCH_TAINTED_on(rx);
1435 TAINT_IF(RX_MATCH_TAINTED(rx));
3280af22 1436 PL_curpm = pm;
c737faaf
YO
1437 if (dynpm->op_pmflags & PMf_ONCE) {
1438#ifdef USE_ITHREADS
1439 SvREADONLY_on(PL_regex_pad[dynpm->op_pmoffset]);
1440#else
1441 dynpm->op_pmflags |= PMf_USED;
1442#endif
1443 }
cf93c79d 1444 if (RX_MATCH_COPIED(rx))
07bc277f 1445 Safefree(RX_SUBBEG(rx));
cf93c79d 1446 RX_MATCH_COPIED_off(rx);
07bc277f 1447 RX_SUBBEG(rx) = NULL;
a0d0e21e 1448 if (global) {
5c144d81 1449 /* FIXME - should rx->subbeg be const char *? */
07bc277f
NC
1450 RX_SUBBEG(rx) = (char *) truebase;
1451 RX_OFFS(rx)[0].start = s - truebase;
a30b2f1f 1452 if (RX_MATCH_UTF8(rx)) {
07bc277f
NC
1453 char * const t = (char*)utf8_hop((U8*)s, RX_MINLENRET(rx));
1454 RX_OFFS(rx)[0].end = t - truebase;
60aeb6fd
NIS
1455 }
1456 else {
07bc277f 1457 RX_OFFS(rx)[0].end = s - truebase + RX_MINLENRET(rx);
60aeb6fd 1458 }
07bc277f 1459 RX_SUBLEN(rx) = strend - truebase;
a0d0e21e 1460 goto gotcha;
1c846c1f 1461 }
07bc277f 1462 if (PL_sawampersand || RX_EXTFLAGS(rx) & RXf_PMf_KEEPCOPY) {
14977893 1463 I32 off;
f8c7b90f 1464#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
1465 if (SvIsCOW(TARG) || (SvFLAGS(TARG) & CAN_COW_MASK) == CAN_COW_FLAGS) {
1466 if (DEBUG_C_TEST) {
1467 PerlIO_printf(Perl_debug_log,
1468 "Copy on write: pp_match $& capture, type %d, truebase=%p, t=%p, difference %d\n",
6c9570dc 1469 (int) SvTYPE(TARG), (void*)truebase, (void*)t,
ed252734
NC
1470 (int)(t-truebase));
1471 }
1472 rx->saved_copy = sv_setsv_cow(rx->saved_copy, TARG);
07bc277f 1473 RX_SUBBEG(rx) = (char *) SvPVX_const(rx->saved_copy) + (t - truebase);
ed252734
NC
1474 assert (SvPOKp(rx->saved_copy));
1475 } else
1476#endif
1477 {
14977893 1478
07bc277f 1479 RX_SUBBEG(rx) = savepvn(t, strend - t);
f8c7b90f 1480#ifdef PERL_OLD_COPY_ON_WRITE
a0714e2c 1481 rx->saved_copy = NULL;
ed252734
NC
1482#endif
1483 }
07bc277f 1484 RX_SUBLEN(rx) = strend - t;
14977893 1485 RX_MATCH_COPIED_on(rx);
07bc277f
NC
1486 off = RX_OFFS(rx)[0].start = s - t;
1487 RX_OFFS(rx)[0].end = off + RX_MINLENRET(rx);
14977893
JH
1488 }
1489 else { /* startp/endp are used by @- @+. */
07bc277f
NC
1490 RX_OFFS(rx)[0].start = s - truebase;
1491 RX_OFFS(rx)[0].end = s - truebase + RX_MINLENRET(rx);
14977893 1492 }
07bc277f 1493 /* including RX_NPARENS(rx) in the below code seems highly suspicious.
cde0cee5 1494 -dmq */
07bc277f 1495 RX_NPARENS(rx) = RX_LASTPAREN(rx) = RX_LASTCLOSEPAREN(rx) = 0; /* used by @-, @+, and $^N */
4633a7c4 1496 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1497 RETPUSHYES;
1498
1499nope:
a0d0e21e 1500ret_no:
d65afb4b 1501 if (global && !(dynpm->op_pmflags & PMf_CONTINUE)) {
a0d0e21e 1502 if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
6136c704 1503 MAGIC* const mg = mg_find(TARG, PERL_MAGIC_regex_global);
a0d0e21e 1504 if (mg)
565764a8 1505 mg->mg_len = -1;
a0d0e21e
LW
1506 }
1507 }
4633a7c4 1508 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
1509 if (gimme == G_ARRAY)
1510 RETURN;
1511 RETPUSHNO;
1512}
1513
1514OP *
864dbfa3 1515Perl_do_readline(pTHX)
a0d0e21e 1516{
27da23d5 1517 dVAR; dSP; dTARGETSTACKED;
a0d0e21e
LW
1518 register SV *sv;
1519 STRLEN tmplen = 0;
1520 STRLEN offset;
760ac839 1521 PerlIO *fp;
a3b680e6
AL
1522 register IO * const io = GvIO(PL_last_in_gv);
1523 register const I32 type = PL_op->op_type;
1524 const I32 gimme = GIMME_V;
a0d0e21e 1525
6136c704
AL
1526 if (io) {
1527 MAGIC * const mg = SvTIED_mg((SV*)io, PERL_MAGIC_tiedscalar);
1528 if (mg) {
1529 PUSHMARK(SP);
1530 XPUSHs(SvTIED_obj((SV*)io, mg));
1531 PUTBACK;
1532 ENTER;
1533 call_method("READLINE", gimme);
1534 LEAVE;
1535 SPAGAIN;
1536 if (gimme == G_SCALAR) {
1537 SV* const result = POPs;
1538 SvSetSV_nosteal(TARG, result);
1539 PUSHTARG;
1540 }
1541 RETURN;
0b7c7b4f 1542 }
e79b0511 1543 }
4608196e 1544 fp = NULL;
a0d0e21e
LW
1545 if (io) {
1546 fp = IoIFP(io);
1547 if (!fp) {
1548 if (IoFLAGS(io) & IOf_ARGV) {
1549 if (IoFLAGS(io) & IOf_START) {
a0d0e21e 1550 IoLINES(io) = 0;
3280af22 1551 if (av_len(GvAVn(PL_last_in_gv)) < 0) {
1d7c1841 1552 IoFLAGS(io) &= ~IOf_START;
4608196e 1553 do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,NULL);
c69033f2 1554 sv_setpvn(GvSVn(PL_last_in_gv), "-", 1);
3280af22 1555 SvSETMAGIC(GvSV(PL_last_in_gv));
a2008d6d
GS
1556 fp = IoIFP(io);
1557 goto have_fp;
a0d0e21e
LW
1558 }
1559 }
3280af22 1560 fp = nextargv(PL_last_in_gv);
a0d0e21e 1561 if (!fp) { /* Note: fp != IoIFP(io) */
3280af22 1562 (void)do_close(PL_last_in_gv, FALSE); /* now it does*/
a0d0e21e
LW
1563 }
1564 }
0d44d22b
NC
1565 else if (type == OP_GLOB)
1566 fp = Perl_start_glob(aTHX_ POPs, io);
a0d0e21e
LW
1567 }
1568 else if (type == OP_GLOB)
1569 SP--;
a00b5bd3 1570 else if (ckWARN(WARN_IO) && IoTYPE(io) == IoTYPE_WRONLY) {
4c80c0b2 1571 report_evil_fh(PL_last_in_gv, io, OP_phoney_OUTPUT_ONLY);
a00b5bd3 1572 }
a0d0e21e
LW
1573 }
1574 if (!fp) {
041457d9
DM
1575 if ((!io || !(IoFLAGS(io) & IOf_START))
1576 && ckWARN2(WARN_GLOB, WARN_CLOSED))
1577 {
3f4520fe 1578 if (type == OP_GLOB)
9014280d 1579 Perl_warner(aTHX_ packWARN(WARN_GLOB),
af8c498a
GS
1580 "glob failed (can't start child: %s)",
1581 Strerror(errno));
69282e91 1582 else
bc37a18f 1583 report_evil_fh(PL_last_in_gv, io, PL_op->op_type);
3f4520fe 1584 }
54310121 1585 if (gimme == G_SCALAR) {
79628082 1586 /* undef TARG, and push that undefined value */
ba92458f
AE
1587 if (type != OP_RCATLINE) {
1588 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1589 SvOK_off(TARG);
ba92458f 1590 }
a0d0e21e
LW
1591 PUSHTARG;
1592 }
1593 RETURN;
1594 }
a2008d6d 1595 have_fp:
54310121 1596 if (gimme == G_SCALAR) {
a0d0e21e 1597 sv = TARG;
0f722b55
RGS
1598 if (type == OP_RCATLINE && SvGMAGICAL(sv))
1599 mg_get(sv);
48de12d9
RGS
1600 if (SvROK(sv)) {
1601 if (type == OP_RCATLINE)
1602 SvPV_force_nolen(sv);
1603 else
1604 sv_unref(sv);
1605 }
f7877b28
NC
1606 else if (isGV_with_GP(sv)) {
1607 SvPV_force_nolen(sv);
1608 }
862a34c6 1609 SvUPGRADE(sv, SVt_PV);
a0d0e21e 1610 tmplen = SvLEN(sv); /* remember if already alloced */
bc44a8a2 1611 if (!tmplen && !SvREADONLY(sv))
a0d0e21e 1612 Sv_Grow(sv, 80); /* try short-buffering it */
2b5e58c4
AMS
1613 offset = 0;
1614 if (type == OP_RCATLINE && SvOK(sv)) {
1615 if (!SvPOK(sv)) {
8b6b16e7 1616 SvPV_force_nolen(sv);
2b5e58c4 1617 }
a0d0e21e 1618 offset = SvCUR(sv);
2b5e58c4 1619 }
a0d0e21e 1620 }
54310121 1621 else {
561b68a9 1622 sv = sv_2mortal(newSV(80));
54310121
PP
1623 offset = 0;
1624 }
fbad3eb5 1625
3887d568
AP
1626 /* This should not be marked tainted if the fp is marked clean */
1627#define MAYBE_TAINT_LINE(io, sv) \
1628 if (!(IoFLAGS(io) & IOf_UNTAINT)) { \
1629 TAINT; \
1630 SvTAINTED_on(sv); \
1631 }
1632
684bef36 1633/* delay EOF state for a snarfed empty file */
fbad3eb5 1634#define SNARF_EOF(gimme,rs,io,sv) \
684bef36 1635 (gimme != G_SCALAR || SvCUR(sv) \
b9fee9ba 1636 || (IoFLAGS(io) & IOf_NOLINE) || !RsSNARF(rs))
fbad3eb5 1637
a0d0e21e 1638 for (;;) {
09e8efcc 1639 PUTBACK;
fbad3eb5 1640 if (!sv_gets(sv, fp, offset)
2d726892
TF
1641 && (type == OP_GLOB
1642 || SNARF_EOF(gimme, PL_rs, io, sv)
1643 || PerlIO_error(fp)))
fbad3eb5 1644 {
760ac839 1645 PerlIO_clearerr(fp);
a0d0e21e 1646 if (IoFLAGS(io) & IOf_ARGV) {
3280af22 1647 fp = nextargv(PL_last_in_gv);
a0d0e21e
LW
1648 if (fp)
1649 continue;
3280af22 1650 (void)do_close(PL_last_in_gv, FALSE);
a0d0e21e
LW
1651 }
1652 else if (type == OP_GLOB) {
e476b1b5 1653 if (!do_close(PL_last_in_gv, FALSE) && ckWARN(WARN_GLOB)) {
9014280d 1654 Perl_warner(aTHX_ packWARN(WARN_GLOB),
4eb79ab5 1655 "glob failed (child exited with status %d%s)",
894356b3 1656 (int)(STATUS_CURRENT >> 8),
cf494569 1657 (STATUS_CURRENT & 0x80) ? ", core dumped" : "");
4eb79ab5 1658 }
a0d0e21e 1659 }
54310121 1660 if (gimme == G_SCALAR) {
ba92458f
AE
1661 if (type != OP_RCATLINE) {
1662 SV_CHECK_THINKFIRST_COW_DROP(TARG);
0c34ef67 1663 SvOK_off(TARG);
ba92458f 1664 }
09e8efcc 1665 SPAGAIN;
a0d0e21e
LW
1666 PUSHTARG;
1667 }
3887d568 1668 MAYBE_TAINT_LINE(io, sv);
a0d0e21e
LW
1669 RETURN;
1670 }
3887d568 1671 MAYBE_TAINT_LINE(io, sv);
a0d0e21e 1672 IoLINES(io)++;
b9fee9ba 1673 IoFLAGS(io) |= IOf_NOLINE;
71be2cbc 1674 SvSETMAGIC(sv);
09e8efcc 1675 SPAGAIN;
a0d0e21e 1676 XPUSHs(sv);
a0d0e21e 1677 if (type == OP_GLOB) {
349d4f2f 1678 const char *t1;
a0d0e21e 1679
3280af22 1680 if (SvCUR(sv) > 0 && SvCUR(PL_rs) > 0) {
6136c704 1681 char * const tmps = SvEND(sv) - 1;
aa07b2f6 1682 if (*tmps == *SvPVX_const(PL_rs)) {
c07a80fd 1683 *tmps = '\0';
b162af07 1684 SvCUR_set(sv, SvCUR(sv) - 1);
c07a80fd
PP
1685 }
1686 }
349d4f2f
NC
1687 for (t1 = SvPVX_const(sv); *t1; t1++)
1688 if (!isALPHA(*t1) && !isDIGIT(*t1) &&
1689 strchr("$&*(){}[]'\";\\|?<>~`", *t1))
a0d0e21e 1690 break;
349d4f2f 1691 if (*t1 && PerlLIO_lstat(SvPVX_const(sv), &PL_statbuf) < 0) {
a0d0e21e
LW
1692 (void)POPs; /* Unmatched wildcard? Chuck it... */
1693 continue;
1694 }
2d79bf7f 1695 } else if (SvUTF8(sv)) { /* OP_READLINE, OP_RCATLINE */
d4c19fe8
AL
1696 if (ckWARN(WARN_UTF8)) {
1697 const U8 * const s = (const U8*)SvPVX_const(sv) + offset;
1698 const STRLEN len = SvCUR(sv) - offset;
1699 const U8 *f;
1700
1701 if (!is_utf8_string_loc(s, len, &f))
1702 /* Emulate :encoding(utf8) warning in the same case. */
1703 Perl_warner(aTHX_ packWARN(WARN_UTF8),
1704 "utf8 \"\\x%02X\" does not map to Unicode",
1705 f < (U8*)SvEND(sv) ? *f : 0);
1706 }
a0d0e21e 1707 }
54310121 1708 if (gimme == G_ARRAY) {
a0d0e21e 1709 if (SvLEN(sv) - SvCUR(sv) > 20) {
1da4ca5f 1710 SvPV_shrink_to_cur(sv);
a0d0e21e 1711 }
561b68a9 1712 sv = sv_2mortal(newSV(80));
a0d0e21e
LW
1713 continue;
1714 }
54310121 1715 else if (gimme == G_SCALAR && !tmplen && SvLEN(sv) - SvCUR(sv) > 80) {
a0d0e21e 1716 /* try to reclaim a bit of scalar space (only on 1st alloc) */
d5b5861b
NC
1717 const STRLEN new_len
1718 = SvCUR(sv) < 60 ? 80 : SvCUR(sv)+40; /* allow some slop */
1da4ca5f 1719 SvPV_renew(sv, new_len);
a0d0e21e
LW
1720 }
1721 RETURN;
1722 }
1723}
1724
1725PP(pp_enter)
1726{
27da23d5 1727 dVAR; dSP;
c09156bb 1728 register PERL_CONTEXT *cx;
533c011a 1729 I32 gimme = OP_GIMME(PL_op, -1);
a0d0e21e 1730
54310121
PP
1731 if (gimme == -1) {
1732 if (cxstack_ix >= 0)
1733 gimme = cxstack[cxstack_ix].blk_gimme;
1734 else
1735 gimme = G_SCALAR;
1736 }
a0d0e21e
LW
1737
1738 ENTER;
1739
1740 SAVETMPS;
924508f0 1741 PUSHBLOCK(cx, CXt_BLOCK, SP);
a0d0e21e
LW
1742
1743 RETURN;
1744}
1745
1746PP(pp_helem)
1747{
97aff369 1748 dVAR; dSP;
760ac839 1749 HE* he;
ae77835f 1750 SV **svp;
c445ea15
AL
1751 SV * const keysv = POPs;
1752 HV * const hv = (HV*)POPs;
a3b680e6
AL
1753 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
1754 const U32 defer = PL_op->op_private & OPpLVAL_DEFER;
be6c24e0 1755 SV *sv;
c158a4fd 1756 const U32 hash = (SvIsCOW_shared_hash(keysv)) ? SvSHARED_HASH(keysv) : 0;
9c5ffd7c 1757 I32 preeminent = 0;
a0d0e21e 1758
d4c19fe8 1759 if (SvTYPE(hv) != SVt_PVHV)
a0d0e21e 1760 RETPUSHUNDEF;
d4c19fe8
AL
1761
1762 if (PL_op->op_private & OPpLVAL_INTRO) {
1763 MAGIC *mg;
1764 HV *stash;
1765 /* does the element we're localizing already exist? */
1766 preeminent = /* can we determine whether it exists? */
1767 ( !SvRMAGICAL(hv)
1768 || mg_find((SV*)hv, PERL_MAGIC_env)
1769 || ( (mg = mg_find((SV*)hv, PERL_MAGIC_tied))
1770 /* Try to preserve the existenceness of a tied hash
1771 * element by using EXISTS and DELETE if possible.
1772 * Fallback to FETCH and STORE otherwise */
1773 && (stash = SvSTASH(SvRV(SvTIED_obj((SV*)hv, mg))))
1774 && gv_fetchmethod_autoload(stash, "EXISTS", TRUE)
1775 && gv_fetchmethod_autoload(stash, "DELETE", TRUE)
1776 )
1777 ) ? hv_exists_ent(hv, keysv, 0) : 1;
1778 }
1779 he = hv_fetch_ent(hv, keysv, lval && !defer, hash);
1780 svp = he ? &HeVAL(he) : NULL;
a0d0e21e 1781 if (lval) {
3280af22 1782 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
1783 SV* lv;
1784 SV* key2;
2d8e6c8d 1785 if (!defer) {
be2597df 1786 DIE(aTHX_ PL_no_helem_sv, SVfARG(keysv));
2d8e6c8d 1787 }
68dc0745
PP
1788 lv = sv_newmortal();
1789 sv_upgrade(lv, SVt_PVLV);
1790 LvTYPE(lv) = 'y';
6136c704 1791 sv_magic(lv, key2 = newSVsv(keysv), PERL_MAGIC_defelem, NULL, 0);
68dc0745 1792 SvREFCNT_dec(key2); /* sv_magic() increments refcount */
b37c2d43 1793 LvTARG(lv) = SvREFCNT_inc_simple(hv);
68dc0745
PP
1794 LvTARGLEN(lv) = 1;
1795 PUSHs(lv);
1796 RETURN;
1797 }
533c011a 1798 if (PL_op->op_private & OPpLVAL_INTRO) {
bfcb3514 1799 if (HvNAME_get(hv) && isGV(*svp))
533c011a 1800 save_gp((GV*)*svp, !(PL_op->op_flags & OPf_SPECIAL));
1f5346dc
SC
1801 else {
1802 if (!preeminent) {
1803 STRLEN keylen;
e62f0680 1804 const char * const key = SvPV_const(keysv, keylen);
7d654f43 1805 SAVEDELETE(hv, savepvn(key,keylen),
bb7a0f54 1806 SvUTF8(keysv) ? -(I32)keylen : (I32)keylen);
bfc4de9f 1807 } else
1f5346dc
SC
1808 save_helem(hv, keysv, svp);
1809 }
5f05dabc 1810 }
533c011a
NIS
1811 else if (PL_op->op_private & OPpDEREF)
1812 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 1813 }
3280af22 1814 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
1815 /* This makes C<local $tied{foo} = $tied{foo}> possible.
1816 * Pushing the magical RHS on to the stack is useless, since
1817 * that magic is soon destined to be misled by the local(),
1818 * and thus the later pp_sassign() will fail to mg_get() the
1819 * old value. This should also cure problems with delayed
1820 * mg_get()s. GSAR 98-07-03 */
1821 if (!lval && SvGMAGICAL(sv))
1822 sv = sv_mortalcopy(sv);
1823 PUSHs(sv);
a0d0e21e
LW
1824 RETURN;
1825}
1826
1827PP(pp_leave)
1828{
27da23d5 1829 dVAR; dSP;
c09156bb 1830 register PERL_CONTEXT *cx;
a0d0e21e
LW
1831 SV **newsp;
1832 PMOP *newpm;
1833 I32 gimme;
1834
533c011a 1835 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e 1836 cx = &cxstack[cxstack_ix];
3280af22 1837 cx->blk_oldpm = PL_curpm; /* fake block should preserve $1 et al */
a0d0e21e
LW
1838 }
1839
1840 POPBLOCK(cx,newpm);
1841
533c011a 1842 gimme = OP_GIMME(PL_op, -1);
54310121
PP
1843 if (gimme == -1) {
1844 if (cxstack_ix >= 0)
1845 gimme = cxstack[cxstack_ix].blk_gimme;
1846 else
1847 gimme = G_SCALAR;
1848 }
a0d0e21e 1849
a1f49e72 1850 TAINT_NOT;
54310121
PP
1851 if (gimme == G_VOID)
1852 SP = newsp;
1853 else if (gimme == G_SCALAR) {
a3b680e6 1854 register SV **mark;
54310121 1855 MARK = newsp + 1;
09256e2f 1856 if (MARK <= SP) {
54310121
PP
1857 if (SvFLAGS(TOPs) & (SVs_PADTMP|SVs_TEMP))
1858 *MARK = TOPs;
1859 else
1860 *MARK = sv_mortalcopy(TOPs);
09256e2f 1861 } else {
54310121 1862 MEXTEND(mark,0);
3280af22 1863 *MARK = &PL_sv_undef;
a0d0e21e 1864 }
54310121 1865 SP = MARK;
a0d0e21e 1866 }
54310121 1867 else if (gimme == G_ARRAY) {
a1f49e72 1868 /* in case LEAVE wipes old return values */
a3b680e6 1869 register SV **mark;
a1f49e72
CS
1870 for (mark = newsp + 1; mark <= SP; mark++) {
1871 if (!(SvFLAGS(*mark) & (SVs_PADTMP|SVs_TEMP))) {
a0d0e21e 1872 *mark = sv_mortalcopy(*mark);
a1f49e72
CS
1873 TAINT_NOT; /* Each item is independent */
1874 }
1875 }
a0d0e21e 1876 }
3280af22 1877 PL_curpm = newpm; /* Don't pop $1 et al till now */
a0d0e21e
LW
1878
1879 LEAVE;
1880
1881 RETURN;
1882}
1883
1884PP(pp_iter)
1885{
97aff369 1886 dVAR; dSP;
c09156bb 1887 register PERL_CONTEXT *cx;
dc09a129 1888 SV *sv, *oldsv;
4633a7c4 1889 AV* av;
1d7c1841 1890 SV **itersvp;
a0d0e21e 1891
924508f0 1892 EXTEND(SP, 1);
a0d0e21e 1893 cx = &cxstack[cxstack_ix];
6b35e009 1894 if (CxTYPE(cx) != CXt_LOOP)
cea2e8a9 1895 DIE(aTHX_ "panic: pp_iter");
a0d0e21e 1896
1d7c1841 1897 itersvp = CxITERVAR(cx);
4633a7c4 1898 av = cx->blk_loop.iterary;
89ea2908
GA
1899 if (SvTYPE(av) != SVt_PVAV) {
1900 /* iterate ($min .. $max) */
1901 if (cx->blk_loop.iterlval) {
1902 /* string increment */
1903 register SV* cur = cx->blk_loop.iterlval;
4fe3f0fa 1904 STRLEN maxlen = 0;
10edeb5d
JH
1905 const char *max =
1906 SvOK((SV*)av) ?
1907 SvPV_const((SV*)av, maxlen) : (const char *)"";
89ea2908 1908 if (!SvNIOK(cur) && SvCUR(cur) <= maxlen) {
1d7c1841 1909 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1910 /* safe to reuse old SV */
1d7c1841 1911 sv_setsv(*itersvp, cur);
eaa5c2d6 1912 }
1c846c1f 1913 else
eaa5c2d6
GA
1914 {
1915 /* we need a fresh SV every time so that loop body sees a
1916 * completely new SV for closures/references to work as
1917 * they used to */
dc09a129 1918 oldsv = *itersvp;
1d7c1841 1919 *itersvp = newSVsv(cur);
dc09a129 1920 SvREFCNT_dec(oldsv);
eaa5c2d6 1921 }
aa07b2f6 1922 if (strEQ(SvPVX_const(cur), max))
89ea2908
GA
1923 sv_setiv(cur, 0); /* terminate next time */
1924 else
1925 sv_inc(cur);
1926 RETPUSHYES;
1927 }
1928 RETPUSHNO;
1929 }
1930 /* integer increment */
1931 if (cx->blk_loop.iterix > cx->blk_loop.itermax)
1932 RETPUSHNO;
7f61b687 1933
3db8f154 1934 /* don't risk potential race */
1d7c1841 1935 if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
eaa5c2d6 1936 /* safe to reuse old SV */
1d7c1841 1937 sv_setiv(*itersvp, cx->blk_loop.iterix++);
eaa5c2d6 1938 }
1c846c1f 1939 else
eaa5c2d6
GA
1940 {
1941 /* we need a fresh SV every time so that loop body sees a
1942 * completely new SV for closures/references to work as they
1943 * used to */
dc09a129 1944 oldsv = *itersvp;
1d7c1841 1945 *itersvp = newSViv(cx->blk_loop.iterix++);
dc09a129 1946 SvREFCNT_dec(oldsv);
eaa5c2d6 1947 }
89ea2908
GA
1948 RETPUSHYES;
1949 }
1950
1951 /* iterate array */
ef3e5ea9
NC
1952 if (PL_op->op_private & OPpITER_REVERSED) {
1953 /* In reverse, use itermax as the min :-) */
c491ecac 1954 if (cx->blk_loop.iterix <= cx->blk_loop.itermax)
ef3e5ea9 1955 RETPUSHNO;
a0d0e21e 1956
ef3e5ea9 1957 if (SvMAGICAL(av) || AvREIFY(av)) {
c445ea15 1958 SV * const * const svp = av_fetch(av, --cx->blk_loop.iterix, FALSE);
a0714e2c 1959 sv = svp ? *svp : NULL;
ef3e5ea9
NC
1960 }
1961 else {
6e585ca0 1962 sv = AvARRAY(av)[--cx->blk_loop.iterix];
ef3e5ea9 1963 }
d42935ef
JH
1964 }
1965 else {
ef3e5ea9
NC
1966 if (cx->blk_loop.iterix >= (av == PL_curstack ? cx->blk_oldsp :
1967 AvFILL(av)))
1968 RETPUSHNO;
1969
1970 if (SvMAGICAL(av) || AvREIFY(av)) {
c445ea15 1971 SV * const * const svp = av_fetch(av, ++cx->blk_loop.iterix, FALSE);
a0714e2c 1972 sv = svp ? *svp : NULL;
ef3e5ea9
NC
1973 }
1974 else {
1975 sv = AvARRAY(av)[++cx->blk_loop.iterix];
1976 }
d42935ef 1977 }
ef3e5ea9 1978
0565a181 1979 if (sv && SvIS_FREED(sv)) {
a0714e2c 1980 *itersvp = NULL;
b6c83531 1981 Perl_croak(aTHX_ "Use of freed value in iteration");
cccede53
DM
1982 }
1983
d42935ef 1984 if (sv)
a0d0e21e 1985 SvTEMP_off(sv);
a0d0e21e 1986 else
3280af22 1987 sv = &PL_sv_undef;
8b530633 1988 if (av != PL_curstack && sv == &PL_sv_undef) {
5f05dabc 1989 SV *lv = cx->blk_loop.iterlval;
71be2cbc
PP
1990 if (lv && SvREFCNT(lv) > 1) {
1991 SvREFCNT_dec(lv);
a0714e2c 1992 lv = NULL;
71be2cbc 1993 }
5f05dabc
PP
1994 if (lv)
1995 SvREFCNT_dec(LvTARG(lv));
1996 else {
b9f83d2f 1997 lv = cx->blk_loop.iterlval = newSV_type(SVt_PVLV);
5f05dabc 1998 LvTYPE(lv) = 'y';
6136c704 1999 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
5f05dabc 2000 }
b37c2d43 2001 LvTARG(lv) = SvREFCNT_inc_simple(av);
5f05dabc 2002 LvTARGOFF(lv) = cx->blk_loop.iterix;
42718184 2003 LvTARGLEN(lv) = (STRLEN)UV_MAX;
5f05dabc
PP
2004 sv = (SV*)lv;
2005 }
a0d0e21e 2006
dc09a129 2007 oldsv = *itersvp;
b37c2d43 2008 *itersvp = SvREFCNT_inc_simple_NN(sv);
dc09a129
DM
2009 SvREFCNT_dec(oldsv);
2010
a0d0e21e
LW
2011 RETPUSHYES;
2012}
2013
2014PP(pp_subst)
2015{
97aff369 2016 dVAR; dSP; dTARG;
a0d0e21e
LW
2017 register PMOP *pm = cPMOP;
2018 PMOP *rpm = pm;
a0d0e21e
LW
2019 register char *s;
2020 char *strend;
2021 register char *m;
5c144d81 2022 const char *c;
a0d0e21e
LW
2023 register char *d;
2024 STRLEN clen;
2025 I32 iters = 0;
2026 I32 maxiters;
2027 register I32 i;
2028 bool once;
71be2cbc 2029 bool rxtainted;
a0d0e21e 2030 char *orig;
22e551b9 2031 I32 r_flags;
aaa362c4 2032 register REGEXP *rx = PM_GETRE(pm);
a0d0e21e
LW
2033 STRLEN len;
2034 int force_on_match = 0;
0bcc34c2 2035 const I32 oldsave = PL_savestack_ix;
792b2c16 2036 STRLEN slen;
f272994b 2037 bool doutf8 = FALSE;
10300be4 2038 I32 matched;
f8c7b90f 2039#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2040 bool is_cow;
2041#endif
a0714e2c 2042 SV *nsv = NULL;
a0d0e21e 2043
5cd24f17 2044 /* known replacement string? */
b37c2d43 2045 register SV *dstr = (pm->op_pmflags & PMf_CONST) ? POPs : NULL;
533c011a 2046 if (PL_op->op_flags & OPf_STACKED)
a0d0e21e 2047 TARG = POPs;
59f00321
RGS
2048 else if (PL_op->op_private & OPpTARGET_MY)
2049 GETTARGET;
a0d0e21e 2050 else {
54b9620d 2051 TARG = DEFSV;
a0d0e21e 2052 EXTEND(SP,1);
1c846c1f 2053 }
d9f424b2 2054
f8c7b90f 2055#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2056 /* Awooga. Awooga. "bool" types that are actually char are dangerous,
2057 because they make integers such as 256 "false". */
2058 is_cow = SvIsCOW(TARG) ? TRUE : FALSE;
2059#else
765f542d
NC
2060 if (SvIsCOW(TARG))
2061 sv_force_normal_flags(TARG,0);
ed252734
NC
2062#endif
2063 if (
f8c7b90f 2064#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2065 !is_cow &&
2066#endif
2067 (SvREADONLY(TARG)
cecf5685
NC
2068 || ( ((SvTYPE(TARG) == SVt_PVGV && isGV_with_GP(TARG))
2069 || SvTYPE(TARG) > SVt_PVLV)
4ce457a6 2070 && !(SvTYPE(TARG) == SVt_PVGV && SvFAKE(TARG)))))
d470f89e 2071 DIE(aTHX_ PL_no_modify);
8ec5e241
NIS
2072 PUTBACK;
2073
d5263905 2074 s = SvPV_mutable(TARG, len);
68dc0745 2075 if (!SvPOKp(TARG) || SvTYPE(TARG) == SVt_PVGV)
a0d0e21e 2076 force_on_match = 1;
07bc277f 2077 rxtainted = ((RX_EXTFLAGS(rx) & RXf_TAINTED) ||
3280af22
NIS
2078 (PL_tainted && (pm->op_pmflags & PMf_RETAINT)));
2079 if (PL_tainted)
b3eb6a9b 2080 rxtainted |= 2;
9212bbba 2081 TAINT_NOT;
a12c0f56 2082
a30b2f1f 2083 RX_MATCH_UTF8_set(rx, DO_UTF8(TARG));
d9f424b2 2084
a0d0e21e
LW
2085 force_it:
2086 if (!pm || !s)
2269b42e 2087 DIE(aTHX_ "panic: pp_subst");
a0d0e21e
LW
2088
2089 strend = s + len;
a30b2f1f 2090 slen = RX_MATCH_UTF8(rx) ? utf8_length((U8*)s, (U8*)strend) : len;
792b2c16
JH
2091 maxiters = 2 * slen + 10; /* We can match twice at each
2092 position, once with zero-length,
2093 second time with non-zero. */
a0d0e21e 2094
220fc49f 2095 if (!RX_PRELEN(rx) && PL_curpm) {
3280af22 2096 pm = PL_curpm;
aaa362c4 2097 rx = PM_GETRE(pm);
a0d0e21e 2098 }
07bc277f
NC
2099 r_flags = (RX_NPARENS(rx) || SvTEMP(TARG) || PL_sawampersand
2100 || (RX_EXTFLAGS(rx) & (RXf_EVAL_SEEN|RXf_PMf_KEEPCOPY)) )
ed252734 2101 ? REXEC_COPY_STR : 0;
f722798b 2102 if (SvSCREAM(TARG))
22e551b9 2103 r_flags |= REXEC_SCREAM;
7fba1cd6 2104
a0d0e21e 2105 orig = m = s;
07bc277f 2106 if (RX_EXTFLAGS(rx) & RXf_USE_INTUIT) {
ee0b7718 2107 PL_bostr = orig;
f9f4320a 2108 s = CALLREG_INTUIT_START(rx, TARG, s, strend, r_flags, NULL);
f722798b
IZ
2109
2110 if (!s)
2111 goto nope;
2112 /* How to do it in subst? */
07bc277f 2113/* if ( (RX_EXTFLAGS(rx) & RXf_CHECK_ALL)
1c846c1f 2114 && !PL_sawampersand
07bc277f
NC
2115 && !(RX_EXTFLAGS(rx) & RXf_KEEPCOPY)
2116 && ((RX_EXTFLAGS(rx) & RXf_NOSCAN)
2117 || !((RX_EXTFLAGS(rx) & RXf_INTUIT_TAIL)
f722798b
IZ
2118 && (r_flags & REXEC_SCREAM))))
2119 goto yup;
2120*/
a0d0e21e 2121 }
71be2cbc
PP
2122
2123 /* only replace once? */
a0d0e21e 2124 once = !(rpm->op_pmflags & PMf_GLOBAL);
10300be4
YO
2125 matched = CALLREGEXEC(rx, s, strend, orig, 0, TARG, NULL,
2126 r_flags | REXEC_CHECKED);
71be2cbc 2127 /* known replacement string? */
f272994b 2128 if (dstr) {
8514a05a
JH
2129 /* replacement needing upgrading? */
2130 if (DO_UTF8(TARG) && !doutf8) {
db79b45b 2131 nsv = sv_newmortal();
4a176938 2132 SvSetSV(nsv, dstr);
8514a05a
JH
2133 if (PL_encoding)
2134 sv_recode_to_utf8(nsv, PL_encoding);
2135 else
2136 sv_utf8_upgrade(nsv);
5c144d81 2137 c = SvPV_const(nsv, clen);
4a176938
JH
2138 doutf8 = TRUE;
2139 }
2140 else {
5c144d81 2141 c = SvPV_const(dstr, clen);
4a176938 2142 doutf8 = DO_UTF8(dstr);
8514a05a 2143 }
f272994b
A
2144 }
2145 else {
6136c704 2146 c = NULL;
f272994b
A
2147 doutf8 = FALSE;
2148 }
2149
71be2cbc 2150 /* can do inplace substitution? */
ed252734 2151 if (c
f8c7b90f 2152#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2153 && !is_cow
2154#endif
07bc277f
NC
2155 && (I32)clen <= RX_MINLENRET(rx) && (once || !(r_flags & REXEC_COPY_STR))
2156 && !(RX_EXTFLAGS(rx) & RXf_LOOKBEHIND_SEEN)
db79b45b 2157 && (!doutf8 || SvUTF8(TARG))) {
10300be4 2158 if (!matched)
f722798b 2159 {
8ec5e241 2160 SPAGAIN;
3280af22 2161 PUSHs(&PL_sv_no);
71be2cbc
PP
2162 LEAVE_SCOPE(oldsave);
2163 RETURN;
2164 }
f8c7b90f 2165#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2166 if (SvIsCOW(TARG)) {
2167 assert (!force_on_match);
2168 goto have_a_cow;
2169 }
2170#endif
71be2cbc
PP
2171 if (force_on_match) {
2172 force_on_match = 0;
2173 s = SvPV_force(TARG, len);
2174 goto force_it;
2175 }
71be2cbc 2176 d = s;
3280af22 2177 PL_curpm = pm;
71be2cbc
PP
2178 SvSCREAM_off(TARG); /* disable possible screamer */
2179 if (once) {
48c036b1 2180 rxtainted |= RX_MATCH_TAINTED(rx);
07bc277f
NC
2181 m = orig + RX_OFFS(rx)[0].start;
2182 d = orig + RX_OFFS(rx)[0].end;
71be2cbc
PP
2183 s = orig;
2184 if (m - s > strend - d) { /* faster to shorten from end */
2185 if (clen) {
2186 Copy(c, m, clen, char);
2187 m += clen;
a0d0e21e 2188 }
71be2cbc
PP
2189 i = strend - d;
2190 if (i > 0) {
2191 Move(d, m, i, char);
2192 m += i;
a0d0e21e 2193 }
71be2cbc
PP
2194 *m = '\0';
2195 SvCUR_set(TARG, m - s);
2196 }
155aba94 2197 else if ((i = m - s)) { /* faster from front */
71be2cbc
PP
2198 d -= clen;
2199 m = d;
0d3c21b0 2200 Move(s, d - i, i, char);
71be2cbc 2201 sv_chop(TARG, d-i);
71be2cbc
PP
2202 if (clen)
2203 Copy(c, m, clen, char);
2204 }
2205 else if (clen) {
2206 d -= clen;
2207 sv_chop(TARG, d);
2208 Copy(c, d, clen, char);
2209 }
2210 else {
2211 sv_chop(TARG, d);
2212 }
48c036b1 2213 TAINT_IF(rxtainted & 1);
8ec5e241 2214 SPAGAIN;
3280af22 2215 PUSHs(&PL_sv_yes);
71be2cbc
PP
2216 }
2217 else {
71be2cbc
PP
2218 do {
2219 if (iters++ > maxiters)
cea2e8a9 2220 DIE(aTHX_ "Substitution loop");
d9f97599 2221 rxtainted |= RX_MATCH_TAINTED(rx);
07bc277f 2222 m = RX_OFFS(rx)[0].start + orig;
155aba94 2223 if ((i = m - s)) {
71be2cbc
PP
2224 if (s != d)
2225 Move(s, d, i, char);
2226 d += i;
a0d0e21e 2227 }
71be2cbc
PP
2228 if (clen) {
2229 Copy(c, d, clen, char);
2230 d += clen;
2231 }
07bc277f 2232 s = RX_OFFS(rx)[0].end + orig;
f9f4320a 2233 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
f722798b
IZ
2234 TARG, NULL,
2235 /* don't match same null twice */
2236 REXEC_NOT_FIRST|REXEC_IGNOREPOS));
71be2cbc
PP
2237 if (s != d) {
2238 i = strend - s;
aa07b2f6 2239 SvCUR_set(TARG, d - SvPVX_const(TARG) + i);
71be2cbc 2240 Move(s, d, i+1, char); /* include the NUL */
a0d0e21e 2241 }
48c036b1 2242 TAINT_IF(rxtainted & 1);
8ec5e241 2243 SPAGAIN;
71be2cbc 2244 PUSHs(sv_2mortal(newSViv((I32)iters)));
a0d0e21e 2245 }
80b498e0 2246 (void)SvPOK_only_UTF8(TARG);
48c036b1 2247 TAINT_IF(rxtainted);
8ec5e241
NIS
2248 if (SvSMAGICAL(TARG)) {
2249 PUTBACK;
2250 mg_set(TARG);
2251 SPAGAIN;
2252 }
9212bbba 2253 SvTAINT(TARG);
aefe6dfc
JH
2254 if (doutf8)
2255 SvUTF8_on(TARG);
71be2cbc
PP
2256 LEAVE_SCOPE(oldsave);
2257 RETURN;
a0d0e21e 2258 }
71be2cbc 2259
10300be4 2260 if (matched)
f722798b 2261 {
a0d0e21e
LW
2262 if (force_on_match) {
2263 force_on_match = 0;
2264 s = SvPV_force(TARG, len);
2265 goto force_it;
2266 }
f8c7b90f 2267#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2268 have_a_cow:
2269#endif
48c036b1 2270 rxtainted |= RX_MATCH_TAINTED(rx);
f2b990bf 2271 dstr = newSVpvn(m, s-m);
cff085c1 2272 SAVEFREESV(dstr);
ffc61ed2
JH
2273 if (DO_UTF8(TARG))
2274 SvUTF8_on(dstr);
3280af22 2275 PL_curpm = pm;
a0d0e21e 2276 if (!c) {
c09156bb 2277 register PERL_CONTEXT *cx;
8ec5e241 2278 SPAGAIN;
a0d0e21e 2279 PUSHSUBST(cx);
20e98b0f 2280 RETURNOP(cPMOP->op_pmreplrootu.op_pmreplroot);
a0d0e21e 2281 }
cf93c79d 2282 r_flags |= REXEC_IGNOREPOS | REXEC_NOT_FIRST;
a0d0e21e
LW
2283 do {
2284 if (iters++ > maxiters)
cea2e8a9 2285 DIE(aTHX_ "Substitution loop");
d9f97599 2286 rxtainted |= RX_MATCH_TAINTED(rx);
07bc277f 2287 if (RX_MATCH_COPIED(rx) && RX_SUBBEG(rx) != orig) {
a0d0e21e
LW
2288 m = s;
2289 s = orig;
07bc277f 2290 orig = RX_SUBBEG(rx);
a0d0e21e
LW
2291 s = orig + (m - s);
2292 strend = s + (strend - m);
2293 }
07bc277f 2294 m = RX_OFFS(rx)[0].start + orig;
db79b45b
JH
2295 if (doutf8 && !SvUTF8(dstr))
2296 sv_catpvn_utf8_upgrade(dstr, s, m - s, nsv);
2297 else
2298 sv_catpvn(dstr, s, m-s);
07bc277f 2299 s = RX_OFFS(rx)[0].end + orig;
a0d0e21e
LW
2300 if (clen)
2301 sv_catpvn(dstr, c, clen);
2302 if (once)
2303 break;
f9f4320a 2304 } while (CALLREGEXEC(rx, s, strend, orig, s == m,
ffc61ed2 2305 TARG, NULL, r_flags));
db79b45b
JH
2306 if (doutf8 && !DO_UTF8(TARG))
2307 sv_catpvn_utf8_upgrade(dstr, s, strend - s, nsv);
89afcb60
A
2308 else
2309 sv_catpvn(dstr, s, strend - s);
748a9306 2310
f8c7b90f 2311#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC
2312 /* The match may make the string COW. If so, brilliant, because that's
2313 just saved us one malloc, copy and free - the regexp has donated
2314 the old buffer, and we malloc an entirely new one, rather than the
2315 regexp malloc()ing a buffer and copying our original, only for
2316 us to throw it away here during the substitution. */
2317 if (SvIsCOW(TARG)) {
2318 sv_force_normal_flags(TARG, SV_COW_DROP_PV);
2319 } else
2320#endif
2321 {
8bd4d4c5 2322 SvPV_free(TARG);
ed252734 2323 }
f880fe2f 2324 SvPV_set(TARG, SvPVX(dstr));
748a9306
LW
2325 SvCUR_set(TARG, SvCUR(dstr));
2326 SvLEN_set(TARG, SvLEN(dstr));
f272994b 2327 doutf8 |= DO_UTF8(dstr);
6136c704 2328 SvPV_set(dstr, NULL);
748a9306 2329
48c036b1 2330 TAINT_IF(rxtainted & 1);
f878fbec 2331 SPAGAIN;
48c036b1
GS
2332 PUSHs(sv_2mortal(newSViv((I32)iters)));
2333
a0d0e21e 2334 (void)SvPOK_only(TARG);
f272994b 2335 if (doutf8)
60aeb6fd 2336 SvUTF8_on(TARG);
48c036b1 2337 TAINT_IF(rxtainted);
a0d0e21e 2338 SvSETMAGIC(TARG);
9212bbba 2339 SvTAINT(TARG);
4633a7c4 2340 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2341 RETURN;
2342 }
5cd24f17 2343 goto ret_no;
a0d0e21e
LW
2344
2345nope:
1c846c1f 2346ret_no:
8ec5e241 2347 SPAGAIN;
3280af22 2348 PUSHs(&PL_sv_no);
4633a7c4 2349 LEAVE_SCOPE(oldsave);
a0d0e21e
LW
2350 RETURN;
2351}
2352
2353PP(pp_grepwhile)
2354{
27da23d5 2355 dVAR; dSP;
a0d0e21e
LW
2356
2357 if (SvTRUEx(POPs))
3280af22
NIS
2358 PL_stack_base[PL_markstack_ptr[-1]++] = PL_stack_base[*PL_markstack_ptr];
2359 ++*PL_markstack_ptr;
a0d0e21e
LW
2360 LEAVE; /* exit inner scope */
2361
2362 /* All done yet? */
3280af22 2363 if (PL_stack_base + *PL_markstack_ptr > SP) {
a0d0e21e 2364 I32 items;
c4420975 2365 const I32 gimme = GIMME_V;
a0d0e21e
LW
2366
2367 LEAVE; /* exit outer scope */
2368 (void)POPMARK; /* pop src */
3280af22 2369 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 2370 (void)POPMARK; /* pop dst */
3280af22 2371 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 2372 if (gimme == G_SCALAR) {
7cc47870 2373 if (PL_op->op_private & OPpGREP_LEX) {
c4420975 2374 SV* const sv = sv_newmortal();
7cc47870
RGS
2375 sv_setiv(sv, items);
2376 PUSHs(sv);
2377 }
2378 else {
2379 dTARGET;
2380 XPUSHi(items);
2381 }
a0d0e21e 2382 }
54310121
PP
2383 else if (gimme == G_ARRAY)
2384 SP += items;
a0d0e21e
LW
2385 RETURN;
2386 }
2387 else {
2388 SV *src;
2389
2390 ENTER; /* enter inner scope */
1d7c1841 2391 SAVEVPTR(PL_curpm);
a0d0e21e 2392
3280af22 2393 src = PL_stack_base[*PL_markstack_ptr];
a0d0e21e 2394 SvTEMP_off(src);
59f00321
RGS
2395 if (PL_op->op_private & OPpGREP_LEX)
2396 PAD_SVl(PL_op->op_targ) = src;
2397 else
2398 DEFSV = src;
a0d0e21e
LW
2399
2400 RETURNOP(cLOGOP->op_other);
2401 }
2402}
2403
2404PP(pp_leavesub)
2405{
27da23d5 2406 dVAR; dSP;
a0d0e21e
LW
2407 SV **mark;
2408 SV **newsp;
2409 PMOP *newpm;
2410 I32 gimme;
c09156bb 2411 register PERL_CONTEXT *cx;
b0d9ce38 2412 SV *sv;
a0d0e21e 2413
9850bf21
RH
2414 if (CxMULTICALL(&cxstack[cxstack_ix]))
2415 return 0;
2416
a0d0e21e 2417 POPBLOCK(cx,newpm);
5dd42e15 2418 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2419
a1f49e72 2420 TAINT_NOT;
a0d0e21e
LW
2421 if (gimme == G_SCALAR) {
2422 MARK = newsp + 1;
a29cdaf0 2423 if (MARK <= SP) {
a8bba7fa 2424 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
a29cdaf0
IZ
2425 if (SvTEMP(TOPs)) {
2426 *MARK = SvREFCNT_inc(TOPs);
2427 FREETMPS;
2428 sv_2mortal(*MARK);
cd06dffe
GS
2429 }
2430 else {
959e3673 2431 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
a29cdaf0 2432 FREETMPS;
959e3673
GS
2433 *MARK = sv_mortalcopy(sv);
2434 SvREFCNT_dec(sv);
a29cdaf0 2435 }
cd06dffe
GS
2436 }
2437 else
a29cdaf0 2438 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
cd06dffe
GS
2439 }
2440 else {
f86702cc 2441 MEXTEND(MARK, 0);
3280af22 2442 *MARK = &PL_sv_undef;
a0d0e21e
LW
2443 }
2444 SP = MARK;
2445 }
54310121 2446 else if (gimme == G_ARRAY) {
f86702cc 2447 for (MARK = newsp + 1; MARK <= SP; MARK++) {
a1f49e72 2448 if (!SvTEMP(*MARK)) {
f86702cc 2449 *MARK = sv_mortalcopy(*MARK);
a1f49e72
CS
2450 TAINT_NOT; /* Each item is independent */
2451 }
f86702cc 2452 }
a0d0e21e 2453 }
f86702cc 2454 PUTBACK;
1c846c1f 2455
5dd42e15
DM
2456 LEAVE;
2457 cxstack_ix--;
b0d9ce38 2458 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
3280af22 2459 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e 2460
b0d9ce38 2461 LEAVESUB(sv);
f39bc417 2462 return cx->blk_sub.retop;
a0d0e21e
LW
2463}
2464
cd06dffe
GS
2465/* This duplicates the above code because the above code must not
2466 * get any slower by more conditions */
2467PP(pp_leavesublv)
2468{
27da23d5 2469 dVAR; dSP;
cd06dffe
GS
2470 SV **mark;
2471 SV **newsp;
2472 PMOP *newpm;
2473 I32 gimme;
2474 register PERL_CONTEXT *cx;
b0d9ce38 2475 SV *sv;
cd06dffe 2476
9850bf21
RH
2477 if (CxMULTICALL(&cxstack[cxstack_ix]))
2478 return 0;
2479
cd06dffe 2480 POPBLOCK(cx,newpm);
5dd42e15 2481 cxstack_ix++; /* temporarily protect top context */
1c846c1f 2482
cd06dffe
GS
2483 TAINT_NOT;
2484
cc8d50a7 2485 if (cx->blk_sub.lval & OPpENTERSUB_INARGS) {
cd06dffe
GS
2486 /* We are an argument to a function or grep().
2487 * This kind of lvalueness was legal before lvalue
2488 * subroutines too, so be backward compatible:
2489 * cannot report errors. */
2490
2491 /* Scalar context *is* possible, on the LHS of -> only,
2492 * as in f()->meth(). But this is not an lvalue. */
2493 if (gimme == G_SCALAR)
2494 goto temporise;
2495 if (gimme == G_ARRAY) {
a8bba7fa 2496 if (!CvLVALUE(cx->blk_sub.cv))
cd06dffe
GS
2497 goto temporise_array;
2498 EXTEND_MORTAL(SP - newsp);
2499 for (mark = newsp + 1; mark <= SP; mark++) {
2500 if (SvTEMP(*mark))
6f207bd3 2501 NOOP;
cd06dffe
GS
2502 else if (SvFLAGS(*mark) & (SVs_PADTMP | SVf_READONLY))
2503 *mark = sv_mortalcopy(*mark);
2504 else {
2505 /* Can be a localized value subject to deletion. */
2506 PL_tmps_stack[++PL_tmps_ix] = *mark;
b37c2d43 2507 SvREFCNT_inc_void(*mark);
cd06dffe
GS
2508 }
2509 }
2510 }
2511 }
cc8d50a7 2512 else if (cx->blk_sub.lval) { /* Leave it as it is if we can. */
cd06dffe
GS
2513 /* Here we go for robustness, not for speed, so we change all
2514 * the refcounts so the caller gets a live guy. Cannot set
2515 * TEMP, so sv_2mortal is out of question. */
a8bba7fa 2516 if (!CvLVALUE(cx->blk_sub.cv)) {
5dd42e15
DM
2517 LEAVE;
2518 cxstack_ix--;
b0d9ce38 2519 POPSUB(cx,sv);
d470f89e 2520 PL_curpm = newpm;
b0d9ce38 2521 LEAVESUB(sv);
d470f89e
GS
2522 DIE(aTHX_ "Can't modify non-lvalue subroutine call");
2523 }
cd06dffe
GS
2524 if (gimme == G_SCALAR) {
2525 MARK = newsp + 1;
2526 EXTEND_MORTAL(1);
2527 if (MARK == SP) {
f9bc45ef
TP
2528 /* Temporaries are bad unless they happen to be elements
2529 * of a tied hash or array */
2530 if (SvFLAGS(TOPs) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY) &&
2531 !(SvRMAGICAL(TOPs) && mg_find(TOPs, PERL_MAGIC_tiedelem))) {
5dd42e15
DM
2532 LEAVE;
2533 cxstack_ix--;
b0d9ce38 2534 POPSUB(cx,sv);
d470f89e 2535 PL_curpm = newpm;
b0d9ce38 2536 LEAVESUB(sv);
e9f19e3c
HS
2537 DIE(aTHX_ "Can't return %s from lvalue subroutine",
2538 SvREADONLY(TOPs) ? (TOPs == &PL_sv_undef) ? "undef"
2539 : "a readonly value" : "a temporary");
d470f89e 2540 }
cd06dffe
GS
2541 else { /* Can be a localized value
2542 * subject to deletion. */
2543 PL_tmps_stack[++PL_tmps_ix] = *mark;
b37c2d43 2544 SvREFCNT_inc_void(*mark);
cd06dffe
GS
2545 }
2546 }
d470f89e 2547 else { /* Should not happen? */
5dd42e15
DM
2548 LEAVE;
2549 cxstack_ix--;
b0d9ce38 2550 POPSUB(cx,sv);
d470f89e 2551 PL_curpm = newpm;
b0d9ce38 2552 LEAVESUB(sv);
d470f89e 2553 DIE(aTHX_ "%s returned from lvalue subroutine in scalar context",
cd06dffe 2554 (MARK > SP ? "Empty array" : "Array"));
d470f89e 2555 }
cd06dffe
GS
2556 SP = MARK;
2557 }
2558 else if (gimme == G_ARRAY) {
2559 EXTEND_MORTAL(SP - newsp);
2560 for (mark = newsp + 1; mark <= SP; mark++) {
f206cdda
AMS
2561 if (*mark != &PL_sv_undef
2562 && SvFLAGS(*mark) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
d470f89e
GS
2563 /* Might be flattened array after $#array = */
2564 PUTBACK;
5dd42e15
DM
2565 LEAVE;
2566 cxstack_ix--;
b0d9ce38 2567 POPSUB(cx,sv);
d470f89e 2568 PL_curpm = newpm;
b0d9ce38 2569 LEAVESUB(sv);
f206cdda
AMS
2570 DIE(aTHX_ "Can't return a %s from lvalue subroutine",
2571 SvREADONLY(TOPs) ? "readonly value" : "temporary");
d470f89e 2572 }
cd06dffe 2573 else {
cd06dffe
GS
2574 /* Can be a localized value subject to deletion. */
2575 PL_tmps_stack[++PL_tmps_ix] = *mark;
b37c2d43 2576 SvREFCNT_inc_void(*mark);
cd06dffe
GS
2577 }
2578 }
2579 }
2580 }
2581 else {
2582 if (gimme == G_SCALAR) {
2583 temporise:
2584 MARK = newsp + 1;
2585 if (MARK <= SP) {
a8bba7fa 2586 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
cd06dffe
GS
2587 if (SvTEMP(TOPs)) {
2588 *MARK = SvREFCNT_inc(TOPs);
2589 FREETMPS;
2590 sv_2mortal(*MARK);
2591 }
2592 else {
959e3673 2593 sv = SvREFCNT_inc(TOPs); /* FREETMPS could clobber it */
cd06dffe 2594 FREETMPS;
959e3673
GS
2595 *MARK = sv_mortalcopy(sv);
2596 SvREFCNT_dec(sv);
cd06dffe
GS
2597 }
2598 }
2599 else
2600 *MARK = SvTEMP(TOPs) ? TOPs : sv_mortalcopy(TOPs);
2601 }
2602 else {
2603 MEXTEND(MARK, 0);
2604 *MARK = &PL_sv_undef;
2605 }
2606 SP = MARK;
2607 }
2608 else if (gimme == G_ARRAY) {
2609 temporise_array:
2610 for (MARK = newsp + 1; MARK <= SP; MARK++) {
2611 if (!SvTEMP(*MARK)) {
2612 *MARK = sv_mortalcopy(*MARK);
2613 TAINT_NOT; /* Each item is independent */
2614 }
2615 }
2616 }
2617 }
2618 PUTBACK;
1c846c1f 2619
5dd42e15
DM
2620 LEAVE;
2621 cxstack_ix--;
b0d9ce38 2622 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
cd06dffe
GS
2623 PL_curpm = newpm; /* ... and pop $1 et al */
2624
b0d9ce38 2625 LEAVESUB(sv);
f39bc417 2626 return cx->blk_sub.retop;
cd06dffe
GS
2627}
2628
a0d0e21e
LW
2629PP(pp_entersub)
2630{
27da23d5 2631 dVAR; dSP; dPOPss;
a0d0e21e 2632 GV *gv;
a0d0e21e 2633 register CV *cv;
c09156bb 2634 register PERL_CONTEXT *cx;
5d94fbed 2635 I32 gimme;
a9c4fd4e 2636 const bool hasargs = (PL_op->op_flags & OPf_STACKED) != 0;
a0d0e21e
LW
2637
2638 if (!sv)
cea2e8a9 2639 DIE(aTHX_ "Not a CODE reference");
a0d0e21e 2640 switch (SvTYPE(sv)) {
f1025168
NC
2641 /* This is overwhelming the most common case: */
2642 case SVt_PVGV:
f730a42d
NC
2643 if (!(cv = GvCVu((GV*)sv))) {
2644 HV *stash;
f2c0649b 2645 cv = sv_2cv(sv, &stash, &gv, 0);
f730a42d 2646 }
f1025168
NC
2647 if (!cv) {
2648 ENTER;
2649 SAVETMPS;
2650 goto try_autoload;
2651 }
2652 break;
a0d0e21e
LW
2653 default:
2654 if (!SvROK(sv)) {
a9c4fd4e 2655 const char *sym;
780a5241 2656 STRLEN len;
3280af22 2657 if (sv == &PL_sv_yes) { /* unfound import, ignore */
fb73857a 2658 if (hasargs)
3280af22 2659 SP = PL_stack_base + POPMARK;
a0d0e21e 2660 RETURN;
fb73857a 2661 }
15ff848f
CS
2662 if (SvGMAGICAL(sv)) {
2663 mg_get(sv);
f5f1d18e
AMS
2664 if (SvROK(sv))
2665 goto got_rv;
780a5241
NC
2666 if (SvPOKp(sv)) {
2667 sym = SvPVX_const(sv);
2668 len = SvCUR(sv);
2669 } else {
2670 sym = NULL;
2671 len = 0;
2672 }
15ff848f 2673 }
a9c4fd4e 2674 else {
780a5241 2675 sym = SvPV_const(sv, len);
a9c4fd4e 2676 }
15ff848f 2677 if (!sym)
cea2e8a9 2678 DIE(aTHX_ PL_no_usym, "a subroutine");
533c011a 2679 if (PL_op->op_private & HINT_STRICT_REFS)
cea2e8a9 2680 DIE(aTHX_ PL_no_symref, sym, "a subroutine");
780a5241 2681 cv = get_cvn_flags(sym, len, GV_ADD|SvUTF8(sv));
a0d0e21e
LW
2682 break;
2683 }
f5f1d18e 2684 got_rv:
f5284f61 2685 {
823a54a3 2686 SV * const * sp = &sv; /* Used in tryAMAGICunDEREF macro. */
f5284f61
IZ
2687 tryAMAGICunDEREF(to_cv);
2688 }
a0d0e21e
LW
2689 cv = (CV*)SvRV(sv);
2690 if (SvTYPE(cv) == SVt_PVCV)
2691 break;
2692 /* FALL THROUGH */
2693 case SVt_PVHV:
2694 case SVt_PVAV:
cea2e8a9 2695 DIE(aTHX_ "Not a CODE reference");
f1025168 2696 /* This is the second most common case: */
a0d0e21e
LW
2697 case SVt_PVCV:
2698 cv = (CV*)sv;
2699 break;
a0d0e21e
LW
2700 }
2701
2702 ENTER;
2703 SAVETMPS;
2704
2705 retry:
a0d0e21e 2706 if (!CvROOT(cv) && !CvXSUB(cv)) {
2f349aa0
NC
2707 GV* autogv;
2708 SV* sub_name;
2709
2710 /* anonymous or undef'd function leaves us no recourse */
2711 if (CvANON(cv) || !(gv = CvGV(cv)))
2712 DIE(aTHX_ "Undefined subroutine called");
2713
2714 /* autoloaded stub? */
2715 if (cv != GvCV(gv)) {
2716 cv = GvCV(gv);
2717 }
2718 /* should call AUTOLOAD now? */
2719 else {
2720try_autoload:
2721 if ((autogv = gv_autoload4(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv),
2722 FALSE)))
2723 {
2724 cv = GvCV(autogv);
2725 }
2726 /* sorry */
2727 else {
2728 sub_name = sv_newmortal();
6136c704 2729 gv_efullname3(sub_name, gv, NULL);
be2597df 2730 DIE(aTHX_ "Undefined subroutine &%"SVf" called", SVfARG(sub_name));
2f349aa0
NC
2731 }
2732 }
2733 if (!cv)
2734 DIE(aTHX_ "Not a CODE reference");
2735 goto retry;
a0d0e21e
LW
2736 }
2737
54310121 2738 gimme = GIMME_V;
67caa1fe 2739 if ((PL_op->op_private & OPpENTERSUB_DB) && GvCV(PL_DBsub) && !CvNODEBUG(cv)) {
005a8a35 2740 Perl_get_db_sub(aTHX_ &sv, cv);
a9ef256d
NC
2741 if (CvISXSUB(cv))
2742 PL_curcopdb = PL_curcop;
2743 cv = GvCV(PL_DBsub);
2744
ccafdc96
RGS
2745 if (!cv || (!CvXSUB(cv) && !CvSTART(cv)))
2746 DIE(aTHX_ "No DB::sub routine defined");
67caa1fe 2747 }
a0d0e21e 2748
aed2304a 2749 if (!(CvISXSUB(cv))) {
f1025168 2750 /* This path taken at least 75% of the time */
a0d0e21e
LW
2751 dMARK;
2752 register I32 items = SP - MARK;
0bcc34c2 2753 AV* const padlist = CvPADLIST(cv);
a0d0e21e
LW
2754 PUSHBLOCK(cx, CXt_SUB, MARK);
2755 PUSHSUB(cx);
f39bc417 2756 cx->blk_sub.retop = PL_op->op_next;
a0d0e21e 2757 CvDEPTH(cv)++;
6b35e009
GS
2758 /* XXX This would be a natural place to set C<PL_compcv = cv> so
2759 * that eval'' ops within this sub know the correct lexical space.
a3985cdc
DM
2760 * Owing the speed considerations, we choose instead to search for
2761 * the cv using find_runcv() when calling doeval().
6b35e009 2762 */
3a76ca88
RGS
2763 if (CvDEPTH(cv) >= 2) {
2764 PERL_STACK_OVERFLOW_CHECK();
2765 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2766 }
3a76ca88
RGS
2767 SAVECOMPPAD();
2768 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
2769 if (hasargs) {
0bcc34c2 2770 AV* const av = (AV*)PAD_SVl(0);
221373f0
GS
2771 if (AvREAL(av)) {
2772 /* @_ is normally not REAL--this should only ever
2773 * happen when DB::sub() calls things that modify @_ */
2774 av_clear(av);
2775 AvREAL_off(av);
2776 AvREIFY_on(av);
2777 }
3280af22 2778 cx->blk_sub.savearray = GvAV(PL_defgv);
b37c2d43 2779 GvAV(PL_defgv) = (AV*)SvREFCNT_inc_simple(av);
dd2155a4 2780 CX_CURPAD_SAVE(cx->blk_sub);
6d4ff0d2 2781 cx->blk_sub.argarray = av;
a0d0e21e
LW
2782 ++MARK;
2783
2784 if (items > AvMAX(av) + 1) {
504618e9 2785 SV **ary = AvALLOC(av);
a0d0e21e
LW
2786 if (AvARRAY(av) != ary) {
2787 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
9c6bc640 2788 AvARRAY(av) = ary;
a0d0e21e
LW
2789 }
2790 if (items > AvMAX(av) + 1) {
2791 AvMAX(av) = items - 1;
2792 Renew(ary,items,SV*);
2793 AvALLOC(av) = ary;
9c6bc640 2794 AvARRAY(av) = ary;
a0d0e21e
LW
2795 }
2796 }
2797 Copy(MARK,AvARRAY(av),items,SV*);
93965878 2798 AvFILLp(av) = items - 1;
1c846c1f 2799
a0d0e21e
LW
2800 while (items--) {
2801 if (*MARK)
2802 SvTEMP_off(*MARK);
2803 MARK++;
2804 }
2805 }
4a925ff6
GS
2806 /* warning must come *after* we fully set up the context
2807 * stuff so that __WARN__ handlers can safely dounwind()
2808 * if they want to
2809 */
2810 if (CvDEPTH(cv) == 100 && ckWARN(WARN_RECURSION)
2811 && !(PERLDB_SUB && cv == GvCV(PL_DBsub)))
2812 sub_crush_depth(cv);
77a005ab 2813#if 0
bf49b057 2814 DEBUG_S(PerlIO_printf(Perl_debug_log,
6c9570dc 2815 "%p entersub returning %p\n", (void*)thr, (void*)CvSTART(cv)));
77a005ab 2816#endif
a0d0e21e
LW
2817 RETURNOP(CvSTART(cv));
2818 }
f1025168 2819 else {
3a76ca88 2820 I32 markix = TOPMARK;
f1025168 2821
3a76ca88 2822 PUTBACK;
f1025168 2823
3a76ca88
RGS
2824 if (!hasargs) {
2825 /* Need to copy @_ to stack. Alternative may be to
2826 * switch stack to @_, and copy return values
2827 * back. This would allow popping @_ in XSUB, e.g.. XXXX */
2828 AV * const av = GvAV(PL_defgv);
2829 const I32 items = AvFILLp(av) + 1; /* @_ is not tieable */
2830
2831 if (items) {
2832 /* Mark is at the end of the stack. */
2833 EXTEND(SP, items);
2834 Copy(AvARRAY(av), SP + 1, items, SV*);
2835 SP += items;
2836 PUTBACK ;
2837 }
2838 }
2839 /* We assume first XSUB in &DB::sub is the called one. */
2840 if (PL_curcopdb) {
2841 SAVEVPTR(PL_curcop);
2842 PL_curcop = PL_curcopdb;
2843 PL_curcopdb = NULL;
2844 }
2845 /* Do we need to open block here? XXXX */
2846 if (CvXSUB(cv)) /* XXX this is supposed to be true */
2847 (void)(*CvXSUB(cv))(aTHX_ cv);
2848
2849 /* Enforce some sanity in scalar context. */
2850 if (gimme == G_SCALAR && ++markix != PL_stack_sp - PL_stack_base ) {
2851 if (markix > PL_stack_sp - PL_stack_base)
2852 *(PL_stack_base + markix) = &PL_sv_undef;
2853 else
2854 *(PL_stack_base + markix) = *PL_stack_sp;
2855 PL_stack_sp = PL_stack_base + markix;
2856 }
f1025168
NC
2857 LEAVE;
2858 return NORMAL;
2859 }
a0d0e21e
LW
2860}
2861
44a8e56a 2862void
864dbfa3 2863Perl_sub_crush_depth(pTHX_ CV *cv)
44a8e56a
PP
2864{
2865 if (CvANON(cv))
9014280d 2866 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on anonymous subroutine");
44a8e56a 2867 else {
aec46f14 2868 SV* const tmpstr = sv_newmortal();
6136c704 2869 gv_efullname3(tmpstr, CvGV(cv), NULL);
35c1215d 2870 Perl_warner(aTHX_ packWARN(WARN_RECURSION), "Deep recursion on subroutine \"%"SVf"\"",
be2597df 2871 SVfARG(tmpstr));
44a8e56a
PP
2872 }
2873}
2874
a0d0e21e
LW
2875PP(pp_aelem)
2876{
97aff369 2877 dVAR; dSP;
a0d0e21e 2878 SV** svp;
a3b680e6 2879 SV* const elemsv = POPs;
d804643f 2880 IV elem = SvIV(elemsv);
0bcc34c2 2881 AV* const av = (AV*)POPs;
e1ec3a88
AL
2882 const U32 lval = PL_op->op_flags & OPf_MOD || LVRET;
2883 const U32 defer = (PL_op->op_private & OPpLVAL_DEFER) && (elem > av_len(av));
be6c24e0 2884 SV *sv;
a0d0e21e 2885
e35c1634 2886 if (SvROK(elemsv) && !SvGAMAGIC(elemsv) && ckWARN(WARN_MISC))
95b63a38
JH
2887 Perl_warner(aTHX_ packWARN(WARN_MISC),
2888 "Use of reference \"%"SVf"\" as array index",
be2597df 2889 SVfARG(elemsv));
748a9306 2890 if (elem > 0)
fc15ae8f 2891 elem -= CopARYBASE_get(PL_curcop);
a0d0e21e
LW
2892 if (SvTYPE(av) != SVt_PVAV)
2893 RETPUSHUNDEF;
68dc0745 2894 svp = av_fetch(av, elem, lval && !defer);
a0d0e21e 2895 if (lval) {
2b573ace 2896#ifdef PERL_MALLOC_WRAP
2b573ace 2897 if (SvUOK(elemsv)) {
a9c4fd4e 2898 const UV uv = SvUV(elemsv);
2b573ace
JH
2899 elem = uv > IV_MAX ? IV_MAX : uv;
2900 }
2901 else if (SvNOK(elemsv))
2902 elem = (IV)SvNV(elemsv);
a3b680e6
AL
2903 if (elem > 0) {
2904 static const char oom_array_extend[] =
2905 "Out of memory during array extend"; /* Duplicated in av.c */
2b573ace 2906 MEM_WRAP_CHECK_1(elem,SV*,oom_array_extend);
a3b680e6 2907 }
2b573ace 2908#endif
3280af22 2909 if (!svp || *svp == &PL_sv_undef) {
68dc0745
PP
2910 SV* lv;
2911 if (!defer)
cea2e8a9 2912 DIE(aTHX_ PL_no_aelem, elem);
68dc0745
PP
2913 lv = sv_newmortal();
2914 sv_upgrade(lv, SVt_PVLV);
2915 LvTYPE(lv) = 'y';
a0714e2c 2916 sv_magic(lv, NULL, PERL_MAGIC_defelem, NULL, 0);
b37c2d43 2917 LvTARG(lv) = SvREFCNT_inc_simple(av);
68dc0745
PP
2918 LvTARGOFF(lv) = elem;
2919 LvTARGLEN(lv) = 1;
2920 PUSHs(lv);
2921 RETURN;
2922 }
bfc4de9f 2923 if (PL_op->op_private & OPpLVAL_INTRO)
161b7d16 2924 save_aelem(av, elem, svp);
533c011a
NIS
2925 else if (PL_op->op_private & OPpDEREF)
2926 vivify_ref(*svp, PL_op->op_private & OPpDEREF);
a0d0e21e 2927 }
3280af22 2928 sv = (svp ? *svp : &PL_sv_undef);
be6c24e0
GS
2929 if (!lval && SvGMAGICAL(sv)) /* see note in pp_helem() */
2930 sv = sv_mortalcopy(sv);
2931 PUSHs(sv);
a0d0e21e
LW
2932 RETURN;
2933}
2934
02a9e968 2935void
864dbfa3 2936Perl_vivify_ref(pTHX_ SV *sv, U32 to_what)
02a9e968 2937{
5b295bef 2938 SvGETMAGIC(sv);
02a9e968
CS
2939 if (!SvOK(sv)) {
2940 if (SvREADONLY(sv))
cea2e8a9 2941 Perl_croak(aTHX_ PL_no_modify);
43230e26 2942 prepare_SV_for_RV(sv);
68dc0745 2943 switch (to_what) {
5f05dabc 2944 case OPpDEREF_SV:
561b68a9 2945 SvRV_set(sv, newSV(0));
5f05dabc
PP
2946 break;
2947 case OPpDEREF_AV:
b162af07 2948 SvRV_set(sv, (SV*)newAV());
5f05dabc
PP
2949 break;
2950 case OPpDEREF_HV:
b162af07 2951 SvRV_set(sv, (SV*)newHV());
5f05dabc
PP
2952 break;
2953 }
02a9e968
CS
2954 SvROK_on(sv);
2955 SvSETMAGIC(sv);
2956 }
2957}
2958
a0d0e21e
LW
2959PP(pp_method)
2960{
97aff369 2961 dVAR; dSP;
890ce7af 2962 SV* const sv = TOPs;
f5d5a27c
CS
2963
2964 if (SvROK(sv)) {
890ce7af 2965 SV* const rsv = SvRV(sv);
f5d5a27c
CS
2966 if (SvTYPE(rsv) == SVt_PVCV) {
2967 SETs(rsv);
2968 RETURN;
2969 }
2970 }
2971
4608196e 2972 SETs(method_common(sv, NULL));
f5d5a27c
CS
2973 RETURN;
2974}
2975
2976PP(pp_method_named)
2977{
97aff369 2978 dVAR; dSP;
890ce7af 2979 SV* const sv = cSVOP_sv;
c158a4fd 2980 U32 hash = SvSHARED_HASH(sv);
f5d5a27c
CS
2981
2982 XPUSHs(method_common(sv, &hash));
2983 RETURN;
2984}
2985
2986STATIC SV *
2987S_method_common(pTHX_ SV* meth, U32* hashp)
2988{
97aff369 2989 dVAR;
a0d0e21e
LW
2990 SV* ob;
2991 GV* gv;
56304f61 2992 HV* stash;
f5d5a27c 2993 STRLEN namelen;
6136c704 2994 const char* packname = NULL;
a0714e2c 2995 SV *packsv = NULL;
ac91690f 2996 STRLEN packlen;
46c461b5
AL
2997 const char * const name = SvPV_const(meth, namelen);
2998 SV * const sv = *(PL_stack_base + TOPMARK + 1);
f5d5a27c 2999
4f1b7578
SC
3000 if (!sv)
3001 Perl_croak(aTHX_ "Can't call method \"%s\" on an undefined value", name);
3002
5b295bef 3003 SvGETMAGIC(sv);
a0d0e21e 3004 if (SvROK(sv))
16d20bd9 3005 ob = (SV*)SvRV(sv);
a0d0e21e
LW
3006 else {
3007 GV* iogv;
a0d0e21e 3008
af09ea45 3009 /* this isn't a reference */
5c144d81 3010 if(SvOK(sv) && (packname = SvPV_const(sv, packlen))) {
b464bac0 3011 const HE* const he = hv_fetch_ent(PL_stashcache, sv, 0, 0);
081fc587 3012 if (he) {
5e6396ae 3013 stash = INT2PTR(HV*,SvIV(HeVAL(he)));
081fc587
AB
3014 goto fetch;
3015 }
3016 }
3017
a0d0e21e 3018 if (!SvOK(sv) ||
05f5af9a 3019 !(packname) ||
f776e3cd 3020 !(iogv = gv_fetchsv(sv, 0, SVt_PVIO)) ||
a0d0e21e
LW
3021 !(ob=(SV*)GvIO(iogv)))
3022 {
af09ea45 3023 /* this isn't the name of a filehandle either */
1c846c1f 3024 if (!packname ||
fd400ab9 3025 ((UTF8_IS_START(*packname) && DO_UTF8(sv))
b86a2fa7 3026 ? !isIDFIRST_utf8((U8*)packname)
834a4ddd
LW
3027 : !isIDFIRST(*packname)
3028 ))
3029 {
f5d5a27c
CS
3030 Perl_croak(aTHX_ "Can't call method \"%s\" %s", name,
3031 SvOK(sv) ? "without a package or object reference"
3032 : "on an undefined value");
834a4ddd 3033 }
af09ea45 3034 /* assume it's a package name */
da51bb9b 3035 stash = gv_stashpvn(packname, packlen, 0);
0dae17bd
GS
3036 if (!stash)
3037 packsv = sv;
081fc587 3038 else {
d4c19fe8 3039 SV* const ref = newSViv(PTR2IV(stash));
04fe65b0 3040 (void)hv_store(PL_stashcache, packname, packlen, ref, 0);
7e8961ec 3041 }
ac91690f 3042 goto fetch;
a0d0e21e 3043 }
af09ea45 3044 /* it _is_ a filehandle name -- replace with a reference */
3280af22 3045 *(PL_stack_base + TOPMARK + 1) = sv_2mortal(newRV((SV*)iogv));
a0d0e21e
LW
3046 }
3047
af09ea45 3048 /* if we got here, ob should be a reference or a glob */
f0d43078
GS
3049 if (!ob || !(SvOBJECT(ob)
3050 || (SvTYPE(ob) == SVt_PVGV && (ob = (SV*)GvIO((GV*)ob))
3051 && SvOBJECT(ob))))
3052 {
f5d5a27c 3053 Perl_croak(aTHX_ "Can't call method \"%s\" on unblessed reference",
59e7186f 3054 (SvSCREAM(meth) && strEQ(name,"isa")) ? "DOES" :
f5d5a27c 3055 name);
f0d43078 3056 }
a0d0e21e 3057
56304f61 3058 stash = SvSTASH(ob);
a0d0e21e 3059
ac91690f 3060 fetch:
af09ea45
IK
3061 /* NOTE: stash may be null, hope hv_fetch_ent and
3062 gv_fetchmethod can cope (it seems they can) */
3063
f5d5a27c
CS
3064 /* shortcut for simple names */
3065 if (hashp) {
b464bac0 3066 const HE* const he = hv_fetch_ent(stash, meth, 0, *hashp);
f5d5a27c
CS
3067 if (he) {
3068 gv = (GV*)HeVAL(he);
3069 if (isGV(gv) && GvCV(gv) &&
e1a479c5 3070 (!GvCVGEN(gv) || GvCVGEN(gv)
dd69841b 3071 == (PL_sub_generation + HvMROMETA(stash)->cache_gen)))
f5d5a27c
CS
3072 return (SV*)GvCV(gv);
3073 }
3074 }
3075
0dae17bd 3076 gv = gv_fetchmethod(stash ? stash : (HV*)packsv, name);
af09ea45 3077
56304f61 3078 if (!gv) {
af09ea45
IK
3079 /* This code tries to figure out just what went wrong with
3080 gv_fetchmethod. It therefore needs to duplicate a lot of
3081 the internals of that function. We can't move it inside
3082 Perl_gv_fetchmethod_autoload(), however, since that would
3083 cause UNIVERSAL->can("NoSuchPackage::foo") to croak, and we
3084 don't want that.
3085 */
a9c4fd4e 3086 const char* leaf = name;
6136c704 3087 const char* sep = NULL;
a9c4fd4e 3088 const char* p;
56304f61
CS
3089
3090 for (p = name; *p; p++) {
3091 if (*p == '\'')
3092 sep = p, leaf = p + 1;
3093 else if (*p == ':' && *(p + 1) == ':')
3094 sep = p, leaf = p + 2;
3095 }
3096 if (!sep || ((sep - name) == 5 && strnEQ(name, "SUPER", 5))) {
9b9d0b15 3097 /* the method name is unqualified or starts with SUPER:: */
8e3a4a30
NC
3098#ifndef USE_ITHREADS
3099 if (sep)
3100 stash = CopSTASH(PL_curcop);
3101#else
9b9d0b15
NC
3102 bool need_strlen = 1;
3103 if (sep) {
3104 packname = CopSTASHPV(PL_curcop);
3105 }
8e3a4a30
NC
3106 else
3107#endif
3108 if (stash) {
46c461b5 3109 HEK * const packhek = HvNAME_HEK(stash);
9b9d0b15
NC
3110 if (packhek) {
3111 packname = HEK_KEY(packhek);
3112 packlen = HEK_LEN(packhek);
8e3a4a30 3113#ifdef USE_ITHREADS
9b9d0b15 3114 need_strlen = 0;
8e3a4a30 3115#endif
9b9d0b15
NC
3116 } else {
3117 goto croak;
3118 }
3119 }
3120
3121 if (!packname) {
3122 croak:
e27ad1f2
AV
3123 Perl_croak(aTHX_
3124 "Can't use anonymous symbol table for method lookup");
9b9d0b15 3125 }
8e3a4a30
NC
3126#ifdef USE_ITHREADS
3127 if (need_strlen)
e27ad1f2 3128 packlen = strlen(packname);
8e3a4a30 3129#endif
9b9d0b15 3130
56304f61
CS
3131 }
3132 else {
af09ea45 3133 /* the method name is qualified */
56304f61
CS
3134 packname = name;
3135 packlen = sep - name;
3136 }
af09ea45
IK
3137
3138 /* we're relying on gv_fetchmethod not autovivifying the stash */
da51bb9b 3139 if (gv_stashpvn(packname, packlen, 0)) {
c1899e02 3140 Perl_croak(aTHX_
af09ea45
IK
3141 "Can't locate object method \"%s\" via package \"%.*s\"",
3142 leaf, (int)packlen, packname);
c1899e02
GS
3143 }
3144 else {
3145 Perl_croak(aTHX_
af09ea45
IK
3146 "Can't locate object method \"%s\" via package \"%.*s\""
3147 " (perhaps you forgot to load \"%.*s\"?)",
3148 leaf, (int)packlen, packname, (int)packlen, packname);
c1899e02 3149 }
56304f61 3150 }
f5d5a27c 3151 return isGV(gv) ? (SV*)GvCV(gv) : (SV*)gv;
a0d0e21e 3152}
241d1a3b
NC
3153
3154/*
3155 * Local variables:
3156 * c-indentation-style: bsd
3157 * c-basic-offset: 4
3158 * indent-tabs-mode: t
3159 * End:
3160 *
37442d52
RGS
3161 * ex: set ts=8 sts=4 sw=4 noet:
3162 */