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S_return_lvalues: microöptimisation
[perl5.git] / pp_ctl.c
CommitLineData
a0d0e21e
LW		 1/* pp_ctl.c
2 *
1129b882
NC		 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
a0d0e21e
LW		 5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
9 */
10
11/*
4ac71550
TC		 12 * Now far ahead the Road has gone,
13 * And I must follow, if I can,
14 * Pursuing it with eager feet,
15 * Until it joins some larger way
16 * Where many paths and errands meet.
17 * And whither then? I cannot say.
18 *
19 * [Bilbo on p.35 of _The Lord of the Rings_, I/i: "A Long-Expected Party"]
a0d0e21e
LW		 20 */
21
166f8a29
DM		 22/* This file contains control-oriented pp ("push/pop") functions that
23 * execute the opcodes that make up a perl program. A typical pp function
24 * expects to find its arguments on the stack, and usually pushes its
25 * results onto the stack, hence the 'pp' terminology. Each OP structure
26 * contains a pointer to the relevant pp_foo() function.
27 *
28 * Control-oriented means things like pp_enteriter() and pp_next(), which
29 * alter the flow of control of the program.
30 */
31
32
a0d0e21e 33#include "EXTERN.h"
864dbfa3 34#define PERL_IN_PP_CTL_C
a0d0e21e
LW		 35#include "perl.h"
36
54310121 37#define DOCATCH(o) ((CATCH_GET == TRUE) ? docatch(o) : (o))
1e422769 38
94fcd414
NC		 39#define dopoptosub(plop) dopoptosub_at(cxstack, (plop))
40
a0d0e21e
LW		 41PP(pp_wantarray)
42{
97aff369 43 dVAR;
39644a26 44 dSP;
a0d0e21e
LW		 45 I32 cxix;
46 EXTEND(SP, 1);
47
48 cxix = dopoptosub(cxstack_ix);
49 if (cxix < 0)
50 RETPUSHUNDEF;
51
54310121 52 switch (cxstack[cxix].blk_gimme) {
53 case G_ARRAY:
a0d0e21e 54 RETPUSHYES;
54310121 55 case G_SCALAR:
a0d0e21e 56 RETPUSHNO;
54310121 57 default:
58 RETPUSHUNDEF;
59 }
a0d0e21e
LW		 60}
61
2cd61cdb
IZ		 62PP(pp_regcreset)
63{
97aff369 64 dVAR;
2cd61cdb
IZ		 65 /* XXXX Should store the old value to allow for tie/overload - and
66 restore in regcomp, where marked with XXXX. */
3280af22 67 PL_reginterp_cnt = 0;
0b4182de 68 TAINT_NOT;
2cd61cdb
IZ		 69 return NORMAL;
70}
71
b3eb6a9b
GS		 72PP(pp_regcomp)
73{
97aff369 74 dVAR;
39644a26 75 dSP;
a0d0e21e 76 register PMOP *pm = (PMOP*)cLOGOP->op_other;
a0d0e21e 77 SV *tmpstr;
84679df5 78 REGEXP *re = NULL;
bfed75c6 79
4b5a0d1c 80 /* prevent recompiling under /o and ithreads. */
3db8f154 81#if defined(USE_ITHREADS)
131b3ad0
DM		 82 if (pm->op_pmflags & PMf_KEEP && PM_GETRE(pm)) {
83 if (PL_op->op_flags & OPf_STACKED) {
84 dMARK;
85 SP = MARK;
86 }
87 else
88 (void)POPs;
89 RETURN;
90 }
513629ba 91#endif
d4b87e75
BM		 92
93#define tryAMAGICregexp(rx) \
94 STMT_START { \
6f1401dc 95 SvGETMAGIC(rx); \
d4b87e75 96 if (SvROK(rx) && SvAMAGIC(rx)) { \
31d632c3 97 SV *sv = AMG_CALLunary(rx, regexp_amg); \
d4b87e75
BM		 98 if (sv) { \
99 if (SvROK(sv)) \
100 sv = SvRV(sv); \
101 if (SvTYPE(sv) != SVt_REGEXP) \
102 Perl_croak(aTHX_ "Overloaded qr did not return a REGEXP"); \
103 rx = sv; \
104 } \
105 } \
106 } STMT_END
107
108
131b3ad0 109 if (PL_op->op_flags & OPf_STACKED) {
486ec47a 110 /* multiple args; concatenate them */
131b3ad0
DM		 111 dMARK; dORIGMARK;
112 tmpstr = PAD_SV(ARGTARG);
76f68e9b 113 sv_setpvs(tmpstr, "");
131b3ad0 114 while (++MARK <= SP) {
d4b87e75 115 SV *msv = *MARK;
79a8d529 116 SV *sv;
d4b87e75 117
79a8d529 118 tryAMAGICregexp(msv);
d4b87e75 119
79a8d529
DM		 120 if ((SvAMAGIC(tmpstr) || SvAMAGIC(msv)) &&
121 (sv = amagic_call(tmpstr, msv, concat_amg, AMGf_assign)))
122 {
123 sv_setsv(tmpstr, sv);
124 continue;
131b3ad0 125 }
a9984b10 126 sv_catsv_nomg(tmpstr, msv);
131b3ad0
DM		 127 }
128 SvSETMAGIC(tmpstr);
129 SP = ORIGMARK;
130 }
d4b87e75 131 else {
131b3ad0 132 tmpstr = POPs;
d4b87e75
BM		 133 tryAMAGICregexp(tmpstr);
134 }
135
136#undef tryAMAGICregexp
513629ba 137
b3eb6a9b 138 if (SvROK(tmpstr)) {
d8f6592e 139 SV * const sv = SvRV(tmpstr);
5c35adbb 140 if (SvTYPE(sv) == SVt_REGEXP)
d2f13c59 141 re = (REGEXP*) sv;
c277df42 142 }
d4b87e75
BM		 143 else if (SvTYPE(tmpstr) == SVt_REGEXP)
144 re = (REGEXP*) tmpstr;
145
5c35adbb 146 if (re) {
69dc4b30
FC		 147 /* The match's LHS's get-magic might need to access this op's reg-
148 exp (as is sometimes the case with $'; see bug 70764). So we
149 must call get-magic now before we replace the regexp. Hopeful-
150 ly this hack can be replaced with the approach described at
151 http://www.nntp.perl.org/group/perl.perl5.porters/2007/03
152 /msg122415.html some day. */
455d9033
FC		 153 if(pm->op_type == OP_MATCH) {
154 SV *lhs;
155 const bool was_tainted = PL_tainted;
156 if (pm->op_flags & OPf_STACKED)
69dc4b30 157 lhs = TOPs;
455d9033
FC		 158 else if (pm->op_private & OPpTARGET_MY)
159 lhs = PAD_SV(pm->op_targ);
160 else lhs = DEFSV;
161 SvGETMAGIC(lhs);
162 /* Restore the previous value of PL_tainted (which may have been
163 modified by get-magic), to avoid incorrectly setting the
164 RXf_TAINTED flag further down. */
165 PL_tainted = was_tainted;
166 }
69dc4b30 167
f0826785 168 re = reg_temp_copy(NULL, re);
aaa362c4 169 ReREFCNT_dec(PM_GETRE(pm));
28d8d7f4 170 PM_SETRE(pm, re);
c277df42
IZ		 171 }
172 else {
f3ec07c7
DM		 173 STRLEN len = 0;
174 const char *t = SvOK(tmpstr) ? SvPV_nomg_const(tmpstr, len) : "";
175
c737faaf 176 re = PM_GETRE(pm);
14a49a24 177 assert (re != (REGEXP*) &PL_sv_undef);
c277df42 178
20408e3c 179 /* Check against the last compiled regexp. */
a11c8683 180 if (!re || !RX_PRECOMP(re) || RX_PRELEN(re) != len ||
220fc49f 181 memNE(RX_PRECOMP(re), t, len))
85aff577 182 {
07bc277f 183 const regexp_engine *eng = re ? RX_ENGINE(re) : NULL;
73134a2e 184 U32 pm_flags = pm->op_pmflags & RXf_PMf_COMPILETIME;
d8f6592e
AL		 185 if (re) {
186 ReREFCNT_dec(re);
14a49a24
NC		 187#ifdef USE_ITHREADS
188 PM_SETRE(pm, (REGEXP*) &PL_sv_undef);
189#else
4608196e 190 PM_SETRE(pm, NULL); /* crucial if regcomp aborts */
14a49a24 191#endif
1e2e3d02 192 } else if (PL_curcop->cop_hints_hash) {
20439bc7 193 SV *ptr = cop_hints_fetch_pvs(PL_curcop, "regcomp", 0);
1e2e3d02
YO		 194 if (ptr && SvIOK(ptr) && SvIV(ptr))
195 eng = INT2PTR(regexp_engine*,SvIV(ptr));
c277df42 196 }
664e119d 197
533c011a 198 if (PL_op->op_flags & OPf_SPECIAL)
3280af22 199 PL_reginterp_cnt = I32_MAX; /* Mark as safe. */
a0d0e21e 200
b9ad30b4
NC		 201 if (DO_UTF8(tmpstr)) {
202 assert (SvUTF8(tmpstr));
203 } else if (SvUTF8(tmpstr)) {
204 /* Not doing UTF-8, despite what the SV says. Is this only if
205 we're trapped in use 'bytes'? */
206 /* Make a copy of the octet sequence, but without the flag on,
207 as the compiler now honours the SvUTF8 flag on tmpstr. */
208 STRLEN len;
209 const char *const p = SvPV(tmpstr, len);
210 tmpstr = newSVpvn_flags(p, len, SVs_TEMP);
211 }
f3ec07c7
DM		 212 else if (SvAMAGIC(tmpstr)) {
213 /* make a copy to avoid extra stringifies */
0479a84a 214 tmpstr = newSVpvn_flags(t, len, SVs_TEMP | SvUTF8(tmpstr));
f3ec07c7 215 }
c737faaf 216
a9984b10
FC		 217 /* If it is gmagical, create a mortal copy, but without calling
218 get-magic, as we have already done that. */
219 if(SvGMAGICAL(tmpstr)) {
220 SV *mortalcopy = sv_newmortal();
221 sv_setsv_flags(mortalcopy, tmpstr, 0);
222 tmpstr = mortalcopy;
223 }
224
5a8697a7 225 if (eng)
3ab4a224 226 PM_SETRE(pm, CALLREGCOMP_ENG(eng, tmpstr, pm_flags));
5a8697a7 227 else
3ab4a224 228 PM_SETRE(pm, CALLREGCOMP(tmpstr, pm_flags));
c737faaf 229
f86aaa29 230 PL_reginterp_cnt = 0; /* XXXX Be extra paranoid - needed
2cd61cdb 231 inside tie/overload accessors. */
c277df42 232 }
4633a7c4 233 }
c737faaf
YO		 234
235 re = PM_GETRE(pm);
a0d0e21e 236
72311751 237#ifndef INCOMPLETE_TAINTS
3280af22 238 if (PL_tainting) {
9274aefd
DM		 239 if (PL_tainted) {
240 SvTAINTED_on((SV*)re);
07bc277f 241 RX_EXTFLAGS(re) |= RXf_TAINTED;
9274aefd 242 }
72311751
GS		 243 }
244#endif
245
220fc49f 246 if (!RX_PRELEN(PM_GETRE(pm)) && PL_curpm)
3280af22 247 pm = PL_curpm;
a0d0e21e 248
c737faaf
YO		 249
250#if !defined(USE_ITHREADS)
251 /* can't change the optree at runtime either */
252 /* PMf_KEEP is handled differently under threads to avoid these problems */
a0d0e21e 253 if (pm->op_pmflags & PMf_KEEP) {
c90c0ff4 254 pm->op_private &= ~OPpRUNTIME; /* no point compiling again */
533c011a 255 cLOGOP->op_first->op_next = PL_op->op_next;
a0d0e21e 256 }
c737faaf 257#endif
a0d0e21e
LW		 258 RETURN;
259}
260
261PP(pp_substcont)
262{
97aff369 263 dVAR;
39644a26 264 dSP;
c09156bb 265 register PERL_CONTEXT *cx = &cxstack[cxstack_ix];
901017d6
AL		 266 register PMOP * const pm = (PMOP*) cLOGOP->op_other;
267 register SV * const dstr = cx->sb_dstr;
a0d0e21e
LW		 268 register char *s = cx->sb_s;
269 register char *m = cx->sb_m;
270 char *orig = cx->sb_orig;
901017d6 271 register REGEXP * const rx = cx->sb_rx;
c445ea15 272 SV *nsv = NULL;
988e6e7e 273 REGEXP *old = PM_GETRE(pm);
f410a211
NC		 274
275 PERL_ASYNC_CHECK();
276
988e6e7e 277 if(old != rx) {
bfed75c6 278 if(old)
988e6e7e 279 ReREFCNT_dec(old);
d6106309 280 PM_SETRE(pm,ReREFCNT_inc(rx));
d8f2cf8a
AB		 281 }
282
d9f97599 283 rxres_restore(&cx->sb_rxres, rx);
01b35787 284 RX_MATCH_UTF8_set(rx, DO_UTF8(cx->sb_targ));
c90c0ff4 285
a0d0e21e 286 if (cx->sb_iters++) {
a3b680e6 287 const I32 saviters = cx->sb_iters;
a0d0e21e 288 if (cx->sb_iters > cx->sb_maxiters)
cea2e8a9 289 DIE(aTHX_ "Substitution loop");
a0d0e21e 290
447ee134
DM		 291 SvGETMAGIC(TOPs); /* possibly clear taint on $1 etc: #67962 */
292
ef07e810 293 /* See "how taint works" above pp_subst() */
20be6587
DM		 294 if (SvTAINTED(TOPs))
295 cx->sb_rxtainted |= SUBST_TAINT_REPL;
447ee134 296 sv_catsv_nomg(dstr, POPs);
2c296965
YO		 297 /* XXX: adjust for positive offsets of \G for instance s/(.)\G//g with positive pos() */
298 s -= RX_GOFS(rx);
a0d0e21e
LW		 299
300 /* Are we done */
134b8cd8
NC		 301 /* I believe that we can't set REXEC_SCREAM here if
302 SvSCREAM(cx->sb_targ) is true because SvPVX(cx->sb_targ) isn't always
303 equal to s. [See the comment before Perl_re_intuit_start(), which is
304 called from Perl_regexec_flags(), which says that it should be when
305 SvSCREAM() is true.] s, cx->sb_strend and orig will be consistent
306 with SvPVX(cx->sb_targ), as substconst doesn't modify cx->sb_targ
307 during the match. */
2c296965
YO		 308 if (CxONCE(cx) || s < orig ||
309 !CALLREGEXEC(rx, s, cx->sb_strend, orig,
310 (s == m) + RX_GOFS(rx), cx->sb_targ, NULL,
311 ((cx->sb_rflags & REXEC_COPY_STR)
312 ? (REXEC_IGNOREPOS|REXEC_NOT_FIRST)
313 : (REXEC_COPY_STR|REXEC_IGNOREPOS|REXEC_NOT_FIRST))))
a0d0e21e 314 {
8ca8a454 315 SV *targ = cx->sb_targ;
748a9306 316
078c425b
JH		 317 assert(cx->sb_strend >= s);
318 if(cx->sb_strend > s) {
319 if (DO_UTF8(dstr) && !SvUTF8(targ))
320 sv_catpvn_utf8_upgrade(dstr, s, cx->sb_strend - s, nsv);
321 else
322 sv_catpvn(dstr, s, cx->sb_strend - s);
323 }
20be6587
DM		 324 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
325 cx->sb_rxtainted |= SUBST_TAINT_PAT;
9212bbba 326
8ca8a454
NC		 327 if (pm->op_pmflags & PMf_NONDESTRUCT) {
328 PUSHs(dstr);
329 /* From here on down we're using the copy, and leaving the
330 original untouched. */
331 targ = dstr;
332 }
333 else {
f8c7b90f 334#ifdef PERL_OLD_COPY_ON_WRITE
8ca8a454
NC		 335 if (SvIsCOW(targ)) {
336 sv_force_normal_flags(targ, SV_COW_DROP_PV);
337 } else
ed252734 338#endif
8ca8a454
NC		 339 {
340 SvPV_free(targ);
341 }
342 SvPV_set(targ, SvPVX(dstr));
343 SvCUR_set(targ, SvCUR(dstr));
344 SvLEN_set(targ, SvLEN(dstr));
345 if (DO_UTF8(dstr))
346 SvUTF8_on(targ);
347 SvPV_set(dstr, NULL);
348
4f4d7508 349 mPUSHi(saviters - 1);
48c036b1 350
8ca8a454
NC		 351 (void)SvPOK_only_UTF8(targ);
352 }
5cd24f17 353
20be6587 354 /* update the taint state of various various variables in
ef07e810
DM		 355 * preparation for final exit.
356 * See "how taint works" above pp_subst() */
20be6587
DM		 357 if (PL_tainting) {
358 if ((cx->sb_rxtainted & SUBST_TAINT_PAT) ||
359 ((cx->sb_rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
360 == (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
361 )
362 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
363
364 if (!(cx->sb_rxtainted & SUBST_TAINT_BOOLRET)
365 && (cx->sb_rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT))
366 )
367 SvTAINTED_on(TOPs); /* taint return value */
368 /* needed for mg_set below */
369 PL_tainted = cBOOL(cx->sb_rxtainted &
370 (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL));
371 SvTAINT(TARG);
372 }
373 /* PL_tainted must be correctly set for this mg_set */
374 SvSETMAGIC(TARG);
375 TAINT_NOT;
4633a7c4 376 LEAVE_SCOPE(cx->sb_oldsave);
a0d0e21e
LW		 377 POPSUBST(cx);
378 RETURNOP(pm->op_next);
20be6587 379 /* NOTREACHED */
a0d0e21e 380 }
8e5e9ebe 381 cx->sb_iters = saviters;
a0d0e21e 382 }
07bc277f 383 if (RX_MATCH_COPIED(rx) && RX_SUBBEG(rx) != orig) {
a0d0e21e
LW		 384 m = s;
385 s = orig;
07bc277f 386 cx->sb_orig = orig = RX_SUBBEG(rx);
a0d0e21e
LW		 387 s = orig + (m - s);
388 cx->sb_strend = s + (cx->sb_strend - m);
389 }
07bc277f 390 cx->sb_m = m = RX_OFFS(rx)[0].start + orig;
db79b45b 391 if (m > s) {
bfed75c6 392 if (DO_UTF8(dstr) && !SvUTF8(cx->sb_targ))
db79b45b
JH		 393 sv_catpvn_utf8_upgrade(dstr, s, m - s, nsv);
394 else
395 sv_catpvn(dstr, s, m-s);
396 }
07bc277f 397 cx->sb_s = RX_OFFS(rx)[0].end + orig;
084916e3 398 { /* Update the pos() information. */
8ca8a454
NC		 399 SV * const sv
400 = (pm->op_pmflags & PMf_NONDESTRUCT) ? cx->sb_dstr : cx->sb_targ;
084916e3 401 MAGIC *mg;
7a7f3e45 402 SvUPGRADE(sv, SVt_PVMG);
14befaf4 403 if (!(mg = mg_find(sv, PERL_MAGIC_regex_global))) {
d83f0a82 404#ifdef PERL_OLD_COPY_ON_WRITE
51a9ea20 405 if (SvIsCOW(sv))
d83f0a82
NC		 406 sv_force_normal_flags(sv, 0);
407#endif
408 mg = sv_magicext(sv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
409 NULL, 0);
084916e3 410 }
ce474962 411 mg->mg_len = m - orig;
084916e3 412 }
988e6e7e 413 if (old != rx)
d6106309 414 (void)ReREFCNT_inc(rx);
20be6587 415 /* update the taint state of various various variables in preparation
ef07e810
DM		 416 * for calling the code block.
417 * See "how taint works" above pp_subst() */
20be6587
DM		 418 if (PL_tainting) {
419 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
420 cx->sb_rxtainted |= SUBST_TAINT_PAT;
421
422 if ((cx->sb_rxtainted & SUBST_TAINT_PAT) ||
423 ((cx->sb_rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
424 == (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
425 )
426 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
427
428 if (cx->sb_iters > 1 && (cx->sb_rxtainted &
429 (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL)))
8ca8a454
NC		 430 SvTAINTED_on((pm->op_pmflags & PMf_NONDESTRUCT)
431 ? cx->sb_dstr : cx->sb_targ);
20be6587
DM		 432 TAINT_NOT;
433 }
d9f97599 434 rxres_save(&cx->sb_rxres, rx);
af9838cc 435 PL_curpm = pm;
29f2e912 436 RETURNOP(pm->op_pmstashstartu.op_pmreplstart);
a0d0e21e
LW		 437}
438
c90c0ff4 439void
864dbfa3 440Perl_rxres_save(pTHX_ void **rsp, REGEXP *rx)
c90c0ff4 441{
442 UV *p = (UV*)*rsp;
443 U32 i;
7918f24d
NC		 444
445 PERL_ARGS_ASSERT_RXRES_SAVE;
96a5add6 446 PERL_UNUSED_CONTEXT;
c90c0ff4 447
07bc277f 448 if (!p || p[1] < RX_NPARENS(rx)) {
f8c7b90f 449#ifdef PERL_OLD_COPY_ON_WRITE
07bc277f 450 i = 7 + RX_NPARENS(rx) * 2;
ed252734 451#else
07bc277f 452 i = 6 + RX_NPARENS(rx) * 2;
ed252734 453#endif
c90c0ff4 454 if (!p)
a02a5408 455 Newx(p, i, UV);
c90c0ff4 456 else
457 Renew(p, i, UV);
458 *rsp = (void*)p;
459 }
460
07bc277f 461 *p++ = PTR2UV(RX_MATCH_COPIED(rx) ? RX_SUBBEG(rx) : NULL);
cf93c79d 462 RX_MATCH_COPIED_off(rx);
c90c0ff4 463
f8c7b90f 464#ifdef PERL_OLD_COPY_ON_WRITE
bdd9a1b1
NC		 465 *p++ = PTR2UV(RX_SAVED_COPY(rx));
466 RX_SAVED_COPY(rx) = NULL;
ed252734
NC		 467#endif
468
07bc277f 469 *p++ = RX_NPARENS(rx);
c90c0ff4 470
07bc277f
NC		 471 *p++ = PTR2UV(RX_SUBBEG(rx));
472 *p++ = (UV)RX_SUBLEN(rx);
473 for (i = 0; i <= RX_NPARENS(rx); ++i) {
474 *p++ = (UV)RX_OFFS(rx)[i].start;
475 *p++ = (UV)RX_OFFS(rx)[i].end;
c90c0ff4 476 }
477}
478
9c105995
NC		 479static void
480S_rxres_restore(pTHX_ void **rsp, REGEXP *rx)
c90c0ff4 481{
482 UV *p = (UV*)*rsp;
483 U32 i;
7918f24d
NC		 484
485 PERL_ARGS_ASSERT_RXRES_RESTORE;
96a5add6 486 PERL_UNUSED_CONTEXT;
c90c0ff4 487
ed252734 488 RX_MATCH_COPY_FREE(rx);
cf93c79d 489 RX_MATCH_COPIED_set(rx, *p);
c90c0ff4 490 *p++ = 0;
491
f8c7b90f 492#ifdef PERL_OLD_COPY_ON_WRITE
bdd9a1b1
NC		 493 if (RX_SAVED_COPY(rx))
494 SvREFCNT_dec (RX_SAVED_COPY(rx));
495 RX_SAVED_COPY(rx) = INT2PTR(SV*,*p);
ed252734
NC		 496 *p++ = 0;
497#endif
498
07bc277f 499 RX_NPARENS(rx) = *p++;
c90c0ff4 500
07bc277f
NC		 501 RX_SUBBEG(rx) = INT2PTR(char*,*p++);
502 RX_SUBLEN(rx) = (I32)(*p++);
503 for (i = 0; i <= RX_NPARENS(rx); ++i) {
504 RX_OFFS(rx)[i].start = (I32)(*p++);
505 RX_OFFS(rx)[i].end = (I32)(*p++);
c90c0ff4 506 }
507}
508
9c105995
NC		 509static void
510S_rxres_free(pTHX_ void **rsp)
c90c0ff4 511{
44f8325f 512 UV * const p = (UV*)*rsp;
7918f24d
NC		 513
514 PERL_ARGS_ASSERT_RXRES_FREE;
96a5add6 515 PERL_UNUSED_CONTEXT;
c90c0ff4 516
517 if (p) {
94010e71
NC		 518#ifdef PERL_POISON
519 void *tmp = INT2PTR(char*,*p);
520 Safefree(tmp);
521 if (*p)
7e337ee0 522 PoisonFree(*p, 1, sizeof(*p));
94010e71 523#else
56431972 524 Safefree(INT2PTR(char*,*p));
94010e71 525#endif
f8c7b90f 526#ifdef PERL_OLD_COPY_ON_WRITE
ed252734
NC		 527 if (p[1]) {
528 SvREFCNT_dec (INT2PTR(SV*,p[1]));
529 }
530#endif
c90c0ff4 531 Safefree(p);
4608196e 532 *rsp = NULL;
c90c0ff4 533 }
534}
535
a701009a
DM		 536#define FORM_NUM_BLANK (1<<30)
537#define FORM_NUM_POINT (1<<29)
538
a0d0e21e
LW		 539PP(pp_formline)
540{
97aff369 541 dVAR; dSP; dMARK; dORIGMARK;
823a54a3 542 register SV * const tmpForm = *++MARK;
086b26f3
DM		 543 SV *formsv; /* contains text of original format */
544 register U32 *fpc; /* format ops program counter */
545 register char *t; /* current append position in target string */
546 const char *f; /* current position in format string */
a0d0e21e 547 register I32 arg;
086b26f3
DM		 548 register SV *sv = NULL; /* current item */
549 const char *item = NULL;/* string value of current item */
550 I32 itemsize = 0; /* length of current item, possibly truncated */
551 I32 fieldsize = 0; /* width of current field */
552 I32 lines = 0; /* number of lines that have been output */
553 bool chopspace = (strchr(PL_chopset, ' ') != NULL); /* does $: have space */
554 const char *chophere = NULL; /* where to chop current item */
f5ada144 555 STRLEN linemark = 0; /* pos of start of line in output */
65202027 556 NV value;
086b26f3 557 bool gotsome = FALSE; /* seen at least one non-blank item on this line */
a0d0e21e 558 STRLEN len;
26e935cf 559 STRLEN linemax; /* estimate of output size in bytes */
1bd51a4c
IH		 560 bool item_is_utf8 = FALSE;
561 bool targ_is_utf8 = FALSE;
bfed75c6 562 const char *fmt;
74e0ddf7 563 MAGIC *mg = NULL;
4ff700b9
DM		 564 U8 *source; /* source of bytes to append */
565 STRLEN to_copy; /* how may bytes to append */
ea60cfe8 566 char trans; /* what chars to translate */
74e0ddf7 567
3808a683 568 mg = doparseform(tmpForm);
a0d0e21e 569
74e0ddf7 570 fpc = (U32*)mg->mg_ptr;
3808a683
DM		 571 /* the actual string the format was compiled from.
572 * with overload etc, this may not match tmpForm */
573 formsv = mg->mg_obj;
574
74e0ddf7 575
3280af22 576 SvPV_force(PL_formtarget, len);
3808a683 577 if (SvTAINTED(tmpForm) || SvTAINTED(formsv))
125b9982 578 SvTAINTED_on(PL_formtarget);
1bd51a4c
IH		 579 if (DO_UTF8(PL_formtarget))
580 targ_is_utf8 = TRUE;
26e935cf
DM		 581 linemax = (SvCUR(formsv) * (IN_BYTES ? 1 : 3) + 1);
582 t = SvGROW(PL_formtarget, len + linemax + 1);
583 /* XXX from now onwards, SvCUR(PL_formtarget) is invalid */
a0d0e21e 584 t += len;
3808a683 585 f = SvPV_const(formsv, len);
a0d0e21e
LW		 586
587 for (;;) {
588 DEBUG_f( {
bfed75c6 589 const char *name = "???";
a0d0e21e
LW		 590 arg = -1;
591 switch (*fpc) {
592 case FF_LITERAL: arg = fpc[1]; name = "LITERAL"; break;
593 case FF_BLANK: arg = fpc[1]; name = "BLANK"; break;
594 case FF_SKIP: arg = fpc[1]; name = "SKIP"; break;
595 case FF_FETCH: arg = fpc[1]; name = "FETCH"; break;
596 case FF_DECIMAL: arg = fpc[1]; name = "DECIMAL"; break;
597
598 case FF_CHECKNL: name = "CHECKNL"; break;
599 case FF_CHECKCHOP: name = "CHECKCHOP"; break;
600 case FF_SPACE: name = "SPACE"; break;
601 case FF_HALFSPACE: name = "HALFSPACE"; break;
602 case FF_ITEM: name = "ITEM"; break;
603 case FF_CHOP: name = "CHOP"; break;
604 case FF_LINEGLOB: name = "LINEGLOB"; break;
605 case FF_NEWLINE: name = "NEWLINE"; break;
606 case FF_MORE: name = "MORE"; break;
607 case FF_LINEMARK: name = "LINEMARK"; break;
608 case FF_END: name = "END"; break;
bfed75c6 609 case FF_0DECIMAL: name = "0DECIMAL"; break;
a1b95068 610 case FF_LINESNGL: name = "LINESNGL"; break;
a0d0e21e
LW		 611 }
612 if (arg >= 0)
bf49b057 613 PerlIO_printf(Perl_debug_log, "%-16s%ld\n", name, (long) arg);
a0d0e21e 614 else
bf49b057 615 PerlIO_printf(Perl_debug_log, "%-16s\n", name);
5f80b19c 616 } );
a0d0e21e
LW		 617 switch (*fpc++) {
618 case FF_LINEMARK:
f5ada144 619 linemark = t - SvPVX(PL_formtarget);
a0d0e21e
LW		 620 lines++;
621 gotsome = FALSE;
622 break;
623
624 case FF_LITERAL:
ea60cfe8
DM		 625 to_copy = *fpc++;
626 source = (U8 *)f;
627 f += to_copy;
628 trans = '~';
75645721 629 item_is_utf8 = targ_is_utf8 ? !!DO_UTF8(formsv) : !!SvUTF8(formsv);
ea60cfe8 630 goto append;
a0d0e21e
LW		 631
632 case FF_SKIP:
633 f += *fpc++;
634 break;
635
636 case FF_FETCH:
637 arg = *fpc++;
638 f += arg;
639 fieldsize = arg;
640
641 if (MARK < SP)
642 sv = *++MARK;
643 else {
3280af22 644 sv = &PL_sv_no;
a2a5de95 645 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX), "Not enough format arguments");
a0d0e21e 646 }
125b9982
NT		 647 if (SvTAINTED(sv))
648 SvTAINTED_on(PL_formtarget);
a0d0e21e
LW		 649 break;
650
651 case FF_CHECKNL:
5a34cab7
NC		 652 {
653 const char *send;
654 const char *s = item = SvPV_const(sv, len);
655 itemsize = len;
656 if (DO_UTF8(sv)) {
657 itemsize = sv_len_utf8(sv);
658 if (itemsize != (I32)len) {
659 I32 itembytes;
660 if (itemsize > fieldsize) {
661 itemsize = fieldsize;
662 itembytes = itemsize;
663 sv_pos_u2b(sv, &itembytes, 0);
664 }
665 else
666 itembytes = len;
667 send = chophere = s + itembytes;
668 while (s < send) {
669 if (*s & ~31)
670 gotsome = TRUE;
671 else if (*s == '\n')
672 break;
673 s++;
674 }
675 item_is_utf8 = TRUE;
676 itemsize = s - item;
677 sv_pos_b2u(sv, &itemsize);
678 break;
a0ed51b3 679 }
a0ed51b3 680 }
5a34cab7
NC		 681 item_is_utf8 = FALSE;
682 if (itemsize > fieldsize)
683 itemsize = fieldsize;
684 send = chophere = s + itemsize;
685 while (s < send) {
686 if (*s & ~31)
687 gotsome = TRUE;
688 else if (*s == '\n')
689 break;
690 s++;
691 }
692 itemsize = s - item;
693 break;
a0ed51b3 694 }
a0d0e21e
LW		 695
696 case FF_CHECKCHOP:
5a34cab7
NC		 697 {
698 const char *s = item = SvPV_const(sv, len);
699 itemsize = len;
700 if (DO_UTF8(sv)) {
701 itemsize = sv_len_utf8(sv);
702 if (itemsize != (I32)len) {
703 I32 itembytes;
704 if (itemsize <= fieldsize) {
705 const char *send = chophere = s + itemsize;
706 while (s < send) {
707 if (*s == '\r') {
708 itemsize = s - item;
a0ed51b3 709 chophere = s;
a0ed51b3 710 break;
5a34cab7
NC		 711 }
712 if (*s++ & ~31)
a0ed51b3 713 gotsome = TRUE;
a0ed51b3 714 }
a0ed51b3 715 }
5a34cab7
NC		 716 else {
717 const char *send;
718 itemsize = fieldsize;
719 itembytes = itemsize;
720 sv_pos_u2b(sv, &itembytes, 0);
721 send = chophere = s + itembytes;
722 while (s < send || (s == send && isSPACE(*s))) {
723 if (isSPACE(*s)) {
724 if (chopspace)
725 chophere = s;
726 if (*s == '\r')
727 break;
728 }
729 else {
730 if (*s & ~31)
731 gotsome = TRUE;
732 if (strchr(PL_chopset, *s))
733 chophere = s + 1;
734 }
735 s++;
736 }
737 itemsize = chophere - item;
738 sv_pos_b2u(sv, &itemsize);
739 }
740 item_is_utf8 = TRUE;
a0d0e21e
LW		 741 break;
742 }
a0d0e21e 743 }
5a34cab7
NC		 744 item_is_utf8 = FALSE;
745 if (itemsize <= fieldsize) {
746 const char *const send = chophere = s + itemsize;
747 while (s < send) {
748 if (*s == '\r') {
749 itemsize = s - item;
a0d0e21e 750 chophere = s;
a0d0e21e 751 break;
5a34cab7
NC		 752 }
753 if (*s++ & ~31)
a0d0e21e 754 gotsome = TRUE;
a0d0e21e 755 }
a0d0e21e 756 }
5a34cab7
NC		 757 else {
758 const char *send;
759 itemsize = fieldsize;
760 send = chophere = s + itemsize;
761 while (s < send || (s == send && isSPACE(*s))) {
762 if (isSPACE(*s)) {
763 if (chopspace)
764 chophere = s;
765 if (*s == '\r')
766 break;
767 }
768 else {
769 if (*s & ~31)
770 gotsome = TRUE;
771 if (strchr(PL_chopset, *s))
772 chophere = s + 1;
773 }
774 s++;
775 }
776 itemsize = chophere - item;
777 }
778 break;
a0d0e21e 779 }
a0d0e21e
LW		 780
781 case FF_SPACE:
782 arg = fieldsize - itemsize;
783 if (arg) {
784 fieldsize -= arg;
785 while (arg-- > 0)
786 *t++ = ' ';
787 }
788 break;
789
790 case FF_HALFSPACE:
791 arg = fieldsize - itemsize;
792 if (arg) {
793 arg /= 2;
794 fieldsize -= arg;
795 while (arg-- > 0)
796 *t++ = ' ';
797 }
798 break;
799
800 case FF_ITEM:
8aa7beb6
DM		 801 to_copy = itemsize;
802 source = (U8 *)item;
803 trans = 1;
804 if (item_is_utf8) {
805 /* convert to_copy from chars to bytes */
806 U8 *s = source;
807 while (to_copy--)
808 s += UTF8SKIP(s);
809 to_copy = s - source;
a0d0e21e 810 }
8aa7beb6 811 goto append;
a0d0e21e
LW		 812
813 case FF_CHOP:
5a34cab7
NC		 814 {
815 const char *s = chophere;
816 if (chopspace) {
af68e756 817 while (isSPACE(*s))
5a34cab7
NC		 818 s++;
819 }
820 sv_chop(sv,s);
821 SvSETMAGIC(sv);
822 break;
a0d0e21e 823 }
a0d0e21e 824
a1b95068
WL		 825 case FF_LINESNGL:
826 chopspace = 0;
a0d0e21e 827 case FF_LINEGLOB:
5a34cab7 828 {
e32383e2 829 const bool oneline = fpc[-1] == FF_LINESNGL;
5a34cab7 830 const char *s = item = SvPV_const(sv, len);
7440a75b 831 const char *const send = s + len;
7440a75b 832
f3f2f1a3 833 item_is_utf8 = DO_UTF8(sv);
a1137ee5 834 if (!len)
7440a75b 835 break;
ea60cfe8 836 trans = 0;
0d21cefe 837 gotsome = TRUE;
a1137ee5 838 chophere = s + len;
4ff700b9
DM		 839 source = (U8 *) s;
840 to_copy = len;
0d21cefe
DM		 841 while (s < send) {
842 if (*s++ == '\n') {
843 if (oneline) {
844 to_copy = s - SvPVX_const(sv) - 1;
845 chophere = s;
846 break;
847 } else {
848 if (s == send) {
0d21cefe
DM		 849 to_copy--;
850 } else
851 lines++;
1bd51a4c 852 }
a0d0e21e 853 }
0d21cefe 854 }
a2c0032b
DM		 855 }
856
ea60cfe8
DM		 857 append:
858 /* append to_copy bytes from source to PL_formstring.
859 * item_is_utf8 implies source is utf8.
860 * if trans, translate certain characters during the copy */
a2c0032b
DM		 861 {
862 U8 *tmp = NULL;
26e935cf 863 STRLEN grow = 0;
0325ce87
DM		 864
865 SvCUR_set(PL_formtarget,
866 t - SvPVX_const(PL_formtarget));
867
0d21cefe
DM		 868 if (targ_is_utf8 && !item_is_utf8) {
869 source = tmp = bytes_to_utf8(source, &to_copy);
0d21cefe
DM		 870 } else {
871 if (item_is_utf8 && !targ_is_utf8) {
f5ada144 872 U8 *s;
0d21cefe 873 /* Upgrade targ to UTF8, and then we reduce it to
0325ce87
DM		 874 a problem we have a simple solution for.
875 Don't need get magic. */
0d21cefe 876 sv_utf8_upgrade_nomg(PL_formtarget);
0325ce87 877 targ_is_utf8 = TRUE;
f5ada144
DM		 878 /* re-calculate linemark */
879 s = (U8*)SvPVX(PL_formtarget);
26e935cf
DM		 880 /* the bytes we initially allocated to append the
881 * whole line may have been gobbled up during the
882 * upgrade, so allocate a whole new line's worth
883 * for safety */
884 grow = linemax;
f5ada144
DM		 885 while (linemark--)
886 s += UTF8SKIP(s);
887 linemark = s - (U8*)SvPVX(PL_formtarget);
e8e72d41 888 }
0d21cefe
DM		 889 /* Easy. They agree. */
890 assert (item_is_utf8 == targ_is_utf8);
891 }
26e935cf
DM		 892 if (!trans)
893 /* @* and ^* are the only things that can exceed
894 * the linemax, so grow by the output size, plus
895 * a whole new form's worth in case of any further
896 * output */
897 grow = linemax + to_copy;
898 if (grow)
899 SvGROW(PL_formtarget, SvCUR(PL_formtarget) + grow + 1);
0d21cefe
DM		 900 t = SvPVX(PL_formtarget) + SvCUR(PL_formtarget);
901
902 Copy(source, t, to_copy, char);
ea60cfe8 903 if (trans) {
8aa7beb6
DM		 904 /* blank out ~ or control chars, depending on trans.
905 * works on bytes not chars, so relies on not
906 * matching utf8 continuation bytes */
ea60cfe8
DM		 907 U8 *s = (U8*)t;
908 U8 *send = s + to_copy;
909 while (s < send) {
8aa7beb6
DM		 910 const int ch = *s;
911 if (trans == '~' ? (ch == '~') :
912#ifdef EBCDIC
913 iscntrl(ch)
914#else
915 (!(ch & ~31))
916#endif
917 )
ea60cfe8
DM		 918 *s = ' ';
919 s++;
920 }
921 }
922
0d21cefe
DM		 923 t += to_copy;
924 SvCUR_set(PL_formtarget, SvCUR(PL_formtarget) + to_copy);
a1137ee5 925 if (tmp)
0d21cefe 926 Safefree(tmp);
5a34cab7 927 break;
a0d0e21e 928 }
a0d0e21e 929
a1b95068
WL		 930 case FF_0DECIMAL:
931 arg = *fpc++;
932#if defined(USE_LONG_DOUBLE)
10edeb5d 933 fmt = (const char *)
a701009a 934 ((arg & FORM_NUM_POINT) ?
10edeb5d 935 "%#0*.*" PERL_PRIfldbl : "%0*.*" PERL_PRIfldbl);
a1b95068 936#else
10edeb5d 937 fmt = (const char *)
a701009a 938 ((arg & FORM_NUM_POINT) ?
10edeb5d 939 "%#0*.*f" : "%0*.*f");
a1b95068
WL		 940#endif
941 goto ff_dec;
a0d0e21e 942 case FF_DECIMAL:
a0d0e21e 943 arg = *fpc++;
65202027 944#if defined(USE_LONG_DOUBLE)
10edeb5d 945 fmt = (const char *)
a701009a 946 ((arg & FORM_NUM_POINT) ? "%#*.*" PERL_PRIfldbl : "%*.*" PERL_PRIfldbl);
65202027 947#else
10edeb5d 948 fmt = (const char *)
a701009a 949 ((arg & FORM_NUM_POINT) ? "%#*.*f" : "%*.*f");
65202027 950#endif
a1b95068 951 ff_dec:
784707d5
JP		 952 /* If the field is marked with ^ and the value is undefined,
953 blank it out. */
a701009a 954 if ((arg & FORM_NUM_BLANK) && !SvOK(sv)) {
784707d5
JP		 955 arg = fieldsize;
956 while (arg--)
957 *t++ = ' ';
958 break;
959 }
960 gotsome = TRUE;
961 value = SvNV(sv);
a1b95068 962 /* overflow evidence */
bfed75c6 963 if (num_overflow(value, fieldsize, arg)) {
a1b95068
WL		 964 arg = fieldsize;
965 while (arg--)
966 *t++ = '#';
967 break;
968 }
784707d5
JP		 969 /* Formats aren't yet marked for locales, so assume "yes". */
970 {
971 STORE_NUMERIC_STANDARD_SET_LOCAL();
a701009a
DM		 972 arg &= ~(FORM_NUM_POINT|FORM_NUM_BLANK);
973 my_snprintf(t, SvLEN(PL_formtarget) - (t - SvPVX(PL_formtarget)), fmt, (int) fieldsize, (int) arg, value);
784707d5
JP		 974 RESTORE_NUMERIC_STANDARD();
975 }
976 t += fieldsize;
977 break;
a1b95068 978
a0d0e21e
LW		 979 case FF_NEWLINE:
980 f++;
f5ada144 981 while (t-- > (SvPVX(PL_formtarget) + linemark) && *t == ' ') ;
a0d0e21e
LW		 982 t++;
983 *t++ = '\n';
984 break;
985
986 case FF_BLANK:
987 arg = *fpc++;
988 if (gotsome) {
989 if (arg) { /* repeat until fields exhausted? */
11f9eeaf
DM		 990 fpc--;
991 goto end;
a0d0e21e
LW		 992 }
993 }
994 else {
f5ada144 995 t = SvPVX(PL_formtarget) + linemark;
a0d0e21e
LW		 996 lines--;
997 }
998 break;
999
1000 case FF_MORE:
5a34cab7
NC		 1001 {
1002 const char *s = chophere;
1003 const char *send = item + len;
1004 if (chopspace) {
af68e756 1005 while (isSPACE(*s) && (s < send))
5a34cab7 1006 s++;
a0d0e21e 1007 }
5a34cab7
NC		 1008 if (s < send) {
1009 char *s1;
1010 arg = fieldsize - itemsize;
1011 if (arg) {
1012 fieldsize -= arg;
1013 while (arg-- > 0)
1014 *t++ = ' ';
1015 }
1016 s1 = t - 3;
1017 if (strnEQ(s1," ",3)) {
1018 while (s1 > SvPVX_const(PL_formtarget) && isSPACE(s1[-1]))
1019 s1--;
1020 }
1021 *s1++ = '.';
1022 *s1++ = '.';
1023 *s1++ = '.';
a0d0e21e 1024 }
5a34cab7 1025 break;
a0d0e21e 1026 }
a0d0e21e 1027 case FF_END:
11f9eeaf 1028 end:
bf2bec63 1029 assert(t < SvPVX_const(PL_formtarget) + SvLEN(PL_formtarget));
a0d0e21e 1030 *t = '\0';
b15aece3 1031 SvCUR_set(PL_formtarget, t - SvPVX_const(PL_formtarget));
1bd51a4c
IH		 1032 if (targ_is_utf8)
1033 SvUTF8_on(PL_formtarget);
3280af22 1034 FmLINES(PL_formtarget) += lines;
a0d0e21e 1035 SP = ORIGMARK;
11f9eeaf
DM		 1036 if (fpc[-1] == FF_BLANK)
1037 RETURNOP(cLISTOP->op_first);
1038 else
1039 RETPUSHYES;
a0d0e21e
LW		 1040 }
1041 }
1042}
1043
1044PP(pp_grepstart)
1045{
27da23d5 1046 dVAR; dSP;
a0d0e21e
LW		 1047 SV *src;
1048
3280af22 1049 if (PL_stack_base + *PL_markstack_ptr == SP) {
a0d0e21e 1050 (void)POPMARK;
54310121 1051 if (GIMME_V == G_SCALAR)
6e449a3a 1052 mXPUSHi(0);
533c011a 1053 RETURNOP(PL_op->op_next->op_next);
a0d0e21e 1054 }
3280af22 1055 PL_stack_sp = PL_stack_base + *PL_markstack_ptr + 1;
897d3989
NC		 1056 Perl_pp_pushmark(aTHX); /* push dst */
1057 Perl_pp_pushmark(aTHX); /* push src */
d343c3ef 1058 ENTER_with_name("grep"); /* enter outer scope */
a0d0e21e
LW		 1059
1060 SAVETMPS;
59f00321
RGS		 1061 if (PL_op->op_private & OPpGREP_LEX)
1062 SAVESPTR(PAD_SVl(PL_op->op_targ));
1063 else
1064 SAVE_DEFSV;
d343c3ef 1065 ENTER_with_name("grep_item"); /* enter inner scope */
7766f137 1066 SAVEVPTR(PL_curpm);
a0d0e21e 1067
3280af22 1068 src = PL_stack_base[*PL_markstack_ptr];
a0d0e21e 1069 SvTEMP_off(src);
59f00321
RGS		 1070 if (PL_op->op_private & OPpGREP_LEX)
1071 PAD_SVl(PL_op->op_targ) = src;
1072 else
414bf5ae 1073 DEFSV_set(src);
a0d0e21e
LW		 1074
1075 PUTBACK;
533c011a 1076 if (PL_op->op_type == OP_MAPSTART)
897d3989 1077 Perl_pp_pushmark(aTHX); /* push top */
533c011a 1078 return ((LOGOP*)PL_op->op_next)->op_other;
a0d0e21e
LW		 1079}
1080
a0d0e21e
LW		 1081PP(pp_mapwhile)
1082{
27da23d5 1083 dVAR; dSP;
f54cb97a 1084 const I32 gimme = GIMME_V;
544f3153 1085 I32 items = (SP - PL_stack_base) - *PL_markstack_ptr; /* how many new items */
a0d0e21e
LW		 1086 I32 count;
1087 I32 shift;
1088 SV** src;
ac27b0f5 1089 SV** dst;
a0d0e21e 1090
544f3153 1091 /* first, move source pointer to the next item in the source list */
3280af22 1092 ++PL_markstack_ptr[-1];
544f3153
GS		 1093
1094 /* if there are new items, push them into the destination list */
4c90a460 1095 if (items && gimme != G_VOID) {
544f3153
GS		 1096 /* might need to make room back there first */
1097 if (items > PL_markstack_ptr[-1] - PL_markstack_ptr[-2]) {
1098 /* XXX this implementation is very pessimal because the stack
1099 * is repeatedly extended for every set of items. Is possible
1100 * to do this without any stack extension or copying at all
1101 * by maintaining a separate list over which the map iterates
18ef8bea 1102 * (like foreach does). --gsar */
544f3153
GS		 1103
1104 /* everything in the stack after the destination list moves
1105 * towards the end the stack by the amount of room needed */
1106 shift = items - (PL_markstack_ptr[-1] - PL_markstack_ptr[-2]);
1107
1108 /* items to shift up (accounting for the moved source pointer) */
1109 count = (SP - PL_stack_base) - (PL_markstack_ptr[-1] - 1);
18ef8bea
BT		 1110
1111 /* This optimization is by Ben Tilly and it does
1112 * things differently from what Sarathy (gsar)
1113 * is describing. The downside of this optimization is
1114 * that leaves "holes" (uninitialized and hopefully unused areas)
1115 * to the Perl stack, but on the other hand this
1116 * shouldn't be a problem. If Sarathy's idea gets
1117 * implemented, this optimization should become
1118 * irrelevant. --jhi */
1119 if (shift < count)
1120 shift = count; /* Avoid shifting too often --Ben Tilly */
bfed75c6 1121
924508f0
GS		 1122 EXTEND(SP,shift);
1123 src = SP;
1124 dst = (SP += shift);
3280af22
NIS		 1125 PL_markstack_ptr[-1] += shift;
1126 *PL_markstack_ptr += shift;
544f3153 1127 while (count--)
a0d0e21e
LW		 1128 *dst-- = *src--;
1129 }
544f3153 1130 /* copy the new items down to the destination list */
ac27b0f5 1131 dst = PL_stack_base + (PL_markstack_ptr[-2] += items) - 1;
22023b26 1132 if (gimme == G_ARRAY) {
b2a2a901
DM		 1133 /* add returned items to the collection (making mortal copies
1134 * if necessary), then clear the current temps stack frame
1135 * *except* for those items. We do this splicing the items
1136 * into the start of the tmps frame (so some items may be on
59d53fd6 1137 * the tmps stack twice), then moving PL_tmps_floor above
b2a2a901
DM		 1138 * them, then freeing the frame. That way, the only tmps that
1139 * accumulate over iterations are the return values for map.
1140 * We have to do to this way so that everything gets correctly
1141 * freed if we die during the map.
1142 */
1143 I32 tmpsbase;
1144 I32 i = items;
1145 /* make space for the slice */
1146 EXTEND_MORTAL(items);
1147 tmpsbase = PL_tmps_floor + 1;
1148 Move(PL_tmps_stack + tmpsbase,
1149 PL_tmps_stack + tmpsbase + items,
1150 PL_tmps_ix - PL_tmps_floor,
1151 SV*);
1152 PL_tmps_ix += items;
1153
1154 while (i-- > 0) {
1155 SV *sv = POPs;
1156 if (!SvTEMP(sv))
1157 sv = sv_mortalcopy(sv);
1158 *dst-- = sv;
1159 PL_tmps_stack[tmpsbase++] = SvREFCNT_inc_simple(sv);
1160 }
1161 /* clear the stack frame except for the items */
1162 PL_tmps_floor += items;
1163 FREETMPS;
1164 /* FREETMPS may have cleared the TEMP flag on some of the items */
1165 i = items;
1166 while (i-- > 0)
1167 SvTEMP_on(PL_tmps_stack[--tmpsbase]);
22023b26 1168 }
bfed75c6 1169 else {
22023b26
TP		 1170 /* scalar context: we don't care about which values map returns
1171 * (we use undef here). And so we certainly don't want to do mortal
1172 * copies of meaningless values. */
1173 while (items-- > 0) {
b988aa42 1174 (void)POPs;
22023b26
TP		 1175 *dst-- = &PL_sv_undef;
1176 }
b2a2a901 1177 FREETMPS;
22023b26 1178 }
a0d0e21e 1179 }
b2a2a901
DM		 1180 else {
1181 FREETMPS;
1182 }
d343c3ef 1183 LEAVE_with_name("grep_item"); /* exit inner scope */
a0d0e21e
LW		 1184
1185 /* All done yet? */
3280af22 1186 if (PL_markstack_ptr[-1] > *PL_markstack_ptr) {
a0d0e21e
LW		 1187
1188 (void)POPMARK; /* pop top */
d343c3ef 1189 LEAVE_with_name("grep"); /* exit outer scope */
a0d0e21e 1190 (void)POPMARK; /* pop src */
3280af22 1191 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 1192 (void)POPMARK; /* pop dst */
3280af22 1193 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 1194 if (gimme == G_SCALAR) {
7cc47870
RGS		 1195 if (PL_op->op_private & OPpGREP_LEX) {
1196 SV* sv = sv_newmortal();
1197 sv_setiv(sv, items);
1198 PUSHs(sv);
1199 }
1200 else {
1201 dTARGET;
1202 XPUSHi(items);
1203 }
a0d0e21e 1204 }
54310121 1205 else if (gimme == G_ARRAY)
1206 SP += items;
a0d0e21e
LW		 1207 RETURN;
1208 }
1209 else {
1210 SV *src;
1211
d343c3ef 1212 ENTER_with_name("grep_item"); /* enter inner scope */
7766f137 1213 SAVEVPTR(PL_curpm);
a0d0e21e 1214
544f3153 1215 /* set $_ to the new source item */
3280af22 1216 src = PL_stack_base[PL_markstack_ptr[-1]];
a0d0e21e 1217 SvTEMP_off(src);
59f00321
RGS		 1218 if (PL_op->op_private & OPpGREP_LEX)
1219 PAD_SVl(PL_op->op_targ) = src;
1220 else
414bf5ae 1221 DEFSV_set(src);
a0d0e21e
LW		 1222
1223 RETURNOP(cLOGOP->op_other);
1224 }
1225}
1226
a0d0e21e
LW		 1227/* Range stuff. */
1228
1229PP(pp_range)
1230{
97aff369 1231 dVAR;
a0d0e21e 1232 if (GIMME == G_ARRAY)
1a67a97c 1233 return NORMAL;
538573f7 1234 if (SvTRUEx(PAD_SV(PL_op->op_targ)))
1a67a97c 1235 return cLOGOP->op_other;
538573f7 1236 else
1a67a97c 1237 return NORMAL;
a0d0e21e
LW		 1238}
1239
1240PP(pp_flip)
1241{
97aff369 1242 dVAR;
39644a26 1243 dSP;
a0d0e21e
LW		 1244
1245 if (GIMME == G_ARRAY) {
1a67a97c 1246 RETURNOP(((LOGOP*)cUNOP->op_first)->op_other);
a0d0e21e
LW		 1247 }
1248 else {
1249 dTOPss;
44f8325f 1250 SV * const targ = PAD_SV(PL_op->op_targ);
bfed75c6 1251 int flip = 0;
790090df 1252
bfed75c6 1253 if (PL_op->op_private & OPpFLIP_LINENUM) {
4e3399f9
YST		 1254 if (GvIO(PL_last_in_gv)) {
1255 flip = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
1256 }
1257 else {
fafc274c 1258 GV * const gv = gv_fetchpvs(".", GV_ADD|GV_NOTQUAL, SVt_PV);
44f8325f
AL		 1259 if (gv && GvSV(gv))
1260 flip = SvIV(sv) == SvIV(GvSV(gv));
4e3399f9 1261 }
bfed75c6
AL		 1262 } else {
1263 flip = SvTRUE(sv);
1264 }
1265 if (flip) {
a0d0e21e 1266 sv_setiv(PAD_SV(cUNOP->op_first->op_targ), 1);
533c011a 1267 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e 1268 sv_setiv(targ, 1);
3e3baf6d 1269 SETs(targ);
a0d0e21e
LW		 1270 RETURN;
1271 }
1272 else {
1273 sv_setiv(targ, 0);
924508f0 1274 SP--;
1a67a97c 1275 RETURNOP(((LOGOP*)cUNOP->op_first)->op_other);
a0d0e21e
LW		 1276 }
1277 }
76f68e9b 1278 sv_setpvs(TARG, "");
a0d0e21e
LW		 1279 SETs(targ);
1280 RETURN;
1281 }
1282}
1283
8e9bbdb9
RGS		 1284/* This code tries to decide if "$left .. $right" should use the
1285 magical string increment, or if the range is numeric (we make
1286 an exception for .."0" [#18165]). AMS 20021031. */
1287
1288#define RANGE_IS_NUMERIC(left,right) ( \
b0e74086
RGS		 1289 SvNIOKp(left) || (SvOK(left) && !SvPOKp(left)) || \
1290 SvNIOKp(right) || (SvOK(right) && !SvPOKp(right)) || \
e0ab1c0e 1291 (((!SvOK(left) && SvOK(right)) || ((!SvOK(left) || \
b15aece3 1292 looks_like_number(left)) && SvPOKp(left) && *SvPVX_const(left) != '0')) \
e0ab1c0e 1293 && (!SvOK(right) || looks_like_number(right))))
8e9bbdb9 1294
a0d0e21e
LW		 1295PP(pp_flop)
1296{
97aff369 1297 dVAR; dSP;
a0d0e21e
LW		 1298
1299 if (GIMME == G_ARRAY) {
1300 dPOPPOPssrl;
86cb7173 1301
5b295bef
RD		 1302 SvGETMAGIC(left);
1303 SvGETMAGIC(right);
a0d0e21e 1304
8e9bbdb9 1305 if (RANGE_IS_NUMERIC(left,right)) {
901017d6
AL		 1306 register IV i, j;
1307 IV max;
4fe3f0fa
MHM		 1308 if ((SvOK(left) && SvNV(left) < IV_MIN) ||
1309 (SvOK(right) && SvNV(right) > IV_MAX))
d470f89e 1310 DIE(aTHX_ "Range iterator outside integer range");
a0d0e21e
LW		 1311 i = SvIV(left);
1312 max = SvIV(right);
bbce6d69 1313 if (max >= i) {
c1ab3db2
AK		 1314 j = max - i + 1;
1315 EXTEND_MORTAL(j);
1316 EXTEND(SP, j);
bbce6d69 1317 }
c1ab3db2
AK		 1318 else
1319 j = 0;
1320 while (j--) {
901017d6 1321 SV * const sv = sv_2mortal(newSViv(i++));
a0d0e21e
LW		 1322 PUSHs(sv);
1323 }
1324 }
1325 else {
44f8325f 1326 SV * const final = sv_mortalcopy(right);
13c5b33c 1327 STRLEN len;
823a54a3 1328 const char * const tmps = SvPV_const(final, len);
a0d0e21e 1329
901017d6 1330 SV *sv = sv_mortalcopy(left);
13c5b33c 1331 SvPV_force_nolen(sv);
89ea2908 1332 while (!SvNIOKp(sv) && SvCUR(sv) <= len) {
a0d0e21e 1333 XPUSHs(sv);
b15aece3 1334 if (strEQ(SvPVX_const(sv),tmps))
89ea2908 1335 break;
a0d0e21e
LW		 1336 sv = sv_2mortal(newSVsv(sv));
1337 sv_inc(sv);
1338 }
a0d0e21e
LW		 1339 }
1340 }
1341 else {
1342 dTOPss;
901017d6 1343 SV * const targ = PAD_SV(cUNOP->op_first->op_targ);
4e3399f9 1344 int flop = 0;
a0d0e21e 1345 sv_inc(targ);
4e3399f9
YST		 1346
1347 if (PL_op->op_private & OPpFLIP_LINENUM) {
1348 if (GvIO(PL_last_in_gv)) {
1349 flop = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
1350 }
1351 else {
fafc274c 1352 GV * const gv = gv_fetchpvs(".", GV_ADD|GV_NOTQUAL, SVt_PV);
4e3399f9
YST		 1353 if (gv && GvSV(gv)) flop = SvIV(sv) == SvIV(GvSV(gv));
1354 }
1355 }
1356 else {
1357 flop = SvTRUE(sv);
1358 }
1359
1360 if (flop) {
a0d0e21e 1361 sv_setiv(PAD_SV(((UNOP*)cUNOP->op_first)->op_first->op_targ), 0);
396482e1 1362 sv_catpvs(targ, "E0");
a0d0e21e
LW		 1363 }
1364 SETs(targ);
1365 }
1366
1367 RETURN;
1368}
1369
1370/* Control. */
1371
27da23d5 1372static const char * const context_name[] = {
515afda2 1373 "pseudo-block",
f31522f3 1374 NULL, /* CXt_WHEN never actually needs "block" */
76753e7f 1375 NULL, /* CXt_BLOCK never actually needs "block" */
f31522f3 1376 NULL, /* CXt_GIVEN never actually needs "block" */
76753e7f
NC		 1377 NULL, /* CXt_LOOP_FOR never actually needs "loop" */
1378 NULL, /* CXt_LOOP_PLAIN never actually needs "loop" */
1379 NULL, /* CXt_LOOP_LAZYSV never actually needs "loop" */
1380 NULL, /* CXt_LOOP_LAZYIV never actually needs "loop" */
515afda2 1381 "subroutine",
76753e7f 1382 "format",
515afda2 1383 "eval",
515afda2 1384 "substitution",
515afda2
NC		 1385};
1386
76e3520e 1387STATIC I32
06b5626a 1388S_dopoptolabel(pTHX_ const char *label)
a0d0e21e 1389{
97aff369 1390 dVAR;
a0d0e21e 1391 register I32 i;
a0d0e21e 1392
7918f24d
NC		 1393 PERL_ARGS_ASSERT_DOPOPTOLABEL;
1394
a0d0e21e 1395 for (i = cxstack_ix; i >= 0; i--) {
901017d6 1396 register const PERL_CONTEXT * const cx = &cxstack[i];
6b35e009 1397 switch (CxTYPE(cx)) {
a0d0e21e 1398 case CXt_SUBST:
a0d0e21e 1399 case CXt_SUB:
7766f137 1400 case CXt_FORMAT:
a0d0e21e 1401 case CXt_EVAL:
0a753a76 1402 case CXt_NULL:
a2a5de95
NC		 1403 Perl_ck_warner(aTHX_ packWARN(WARN_EXITING), "Exiting %s via %s",
1404 context_name[CxTYPE(cx)], OP_NAME(PL_op));
515afda2
NC		 1405 if (CxTYPE(cx) == CXt_NULL)
1406 return -1;
1407 break;
c6fdafd0 1408 case CXt_LOOP_LAZYIV:
d01136d6 1409 case CXt_LOOP_LAZYSV:
3b719c58
NC		 1410 case CXt_LOOP_FOR:
1411 case CXt_LOOP_PLAIN:
7e8f1eac
AD		 1412 {
1413 const char *cx_label = CxLABEL(cx);
1414 if (!cx_label || strNE(label, cx_label) ) {
1c98cc53 1415 DEBUG_l(Perl_deb(aTHX_ "(poptolabel(): skipping label at cx=%ld %s)\n",
7e8f1eac 1416 (long)i, cx_label));
a0d0e21e
LW		 1417 continue;
1418 }
1c98cc53 1419 DEBUG_l( Perl_deb(aTHX_ "(poptolabel(): found label at cx=%ld %s)\n", (long)i, label));
a0d0e21e 1420 return i;
7e8f1eac 1421 }
a0d0e21e
LW		 1422 }
1423 }
1424 return i;
1425}
1426
0d863452
RH		 1427
1428
e50aee73 1429I32
864dbfa3 1430Perl_dowantarray(pTHX)
e50aee73 1431{
97aff369 1432 dVAR;
f54cb97a 1433 const I32 gimme = block_gimme();
54310121 1434 return (gimme == G_VOID) ? G_SCALAR : gimme;
1435}
1436
1437I32
864dbfa3 1438Perl_block_gimme(pTHX)
54310121 1439{
97aff369 1440 dVAR;
06b5626a 1441 const I32 cxix = dopoptosub(cxstack_ix);
e50aee73 1442 if (cxix < 0)
46fc3d4c 1443 return G_VOID;
e50aee73 1444
54310121 1445 switch (cxstack[cxix].blk_gimme) {
d2719217
GS		 1446 case G_VOID:
1447 return G_VOID;
54310121 1448 case G_SCALAR:
e50aee73 1449 return G_SCALAR;
54310121 1450 case G_ARRAY:
1451 return G_ARRAY;
1452 default:
cea2e8a9 1453 Perl_croak(aTHX_ "panic: bad gimme: %d\n", cxstack[cxix].blk_gimme);
d2719217
GS		 1454 /* NOTREACHED */
1455 return 0;
54310121 1456 }
e50aee73
AD		 1457}
1458
78f9721b
SM		 1459I32
1460Perl_is_lvalue_sub(pTHX)
1461{
97aff369 1462 dVAR;
06b5626a 1463 const I32 cxix = dopoptosub(cxstack_ix);
78f9721b
SM		 1464 assert(cxix >= 0); /* We should only be called from inside subs */
1465
bafb2adc
NC		 1466 if (CxLVAL(cxstack + cxix) && CvLVALUE(cxstack[cxix].blk_sub.cv))
1467 return CxLVAL(cxstack + cxix);
78f9721b
SM		 1468 else
1469 return 0;
1470}
1471
76e3520e 1472STATIC I32
901017d6 1473S_dopoptosub_at(pTHX_ const PERL_CONTEXT *cxstk, I32 startingblock)
2c375eb9 1474{
97aff369 1475 dVAR;
a0d0e21e 1476 I32 i;
7918f24d
NC		 1477
1478 PERL_ARGS_ASSERT_DOPOPTOSUB_AT;
1479
a0d0e21e 1480 for (i = startingblock; i >= 0; i--) {
901017d6 1481 register const PERL_CONTEXT * const cx = &cxstk[i];
6b35e009 1482 switch (CxTYPE(cx)) {
a0d0e21e
LW		 1483 default:
1484 continue;
1485 case CXt_EVAL:
1486 case CXt_SUB:
7766f137 1487 case CXt_FORMAT:
1c98cc53 1488 DEBUG_l( Perl_deb(aTHX_ "(dopoptosub_at(): found sub at cx=%ld)\n", (long)i));
a0d0e21e
LW		 1489 return i;
1490 }
1491 }
1492 return i;
1493}
1494
76e3520e 1495STATIC I32
cea2e8a9 1496S_dopoptoeval(pTHX_ I32 startingblock)
a0d0e21e 1497{
97aff369 1498 dVAR;
a0d0e21e 1499 I32 i;
a0d0e21e 1500 for (i = startingblock; i >= 0; i--) {
06b5626a 1501 register const PERL_CONTEXT *cx = &cxstack[i];
6b35e009 1502 switch (CxTYPE(cx)) {
a0d0e21e
LW		 1503 default:
1504 continue;
1505 case CXt_EVAL:
1c98cc53 1506 DEBUG_l( Perl_deb(aTHX_ "(dopoptoeval(): found eval at cx=%ld)\n", (long)i));
a0d0e21e
LW		 1507 return i;
1508 }
1509 }
1510 return i;
1511}
1512
76e3520e 1513STATIC I32
cea2e8a9 1514S_dopoptoloop(pTHX_ I32 startingblock)
a0d0e21e 1515{
97aff369 1516 dVAR;
a0d0e21e 1517 I32 i;
a0d0e21e 1518 for (i = startingblock; i >= 0; i--) {
901017d6 1519 register const PERL_CONTEXT * const cx = &cxstack[i];
6b35e009 1520 switch (CxTYPE(cx)) {
a0d0e21e 1521 case CXt_SUBST:
a0d0e21e 1522 case CXt_SUB:
7766f137 1523 case CXt_FORMAT:
a0d0e21e 1524 case CXt_EVAL:
0a753a76 1525 case CXt_NULL:
a2a5de95
NC		 1526 Perl_ck_warner(aTHX_ packWARN(WARN_EXITING), "Exiting %s via %s",
1527 context_name[CxTYPE(cx)], OP_NAME(PL_op));
515afda2
NC		 1528 if ((CxTYPE(cx)) == CXt_NULL)
1529 return -1;
1530 break;
c6fdafd0 1531 case CXt_LOOP_LAZYIV:
d01136d6 1532 case CXt_LOOP_LAZYSV:
3b719c58
NC		 1533 case CXt_LOOP_FOR:
1534 case CXt_LOOP_PLAIN:
1c98cc53 1535 DEBUG_l( Perl_deb(aTHX_ "(dopoptoloop(): found loop at cx=%ld)\n", (long)i));
a0d0e21e
LW		 1536 return i;
1537 }
1538 }
1539 return i;
1540}
1541
0d863452
RH		 1542STATIC I32
1543S_dopoptogiven(pTHX_ I32 startingblock)
1544{
97aff369 1545 dVAR;
0d863452
RH		 1546 I32 i;
1547 for (i = startingblock; i >= 0; i--) {
1548 register const PERL_CONTEXT *cx = &cxstack[i];
1549 switch (CxTYPE(cx)) {
1550 default:
1551 continue;
1552 case CXt_GIVEN:
1c98cc53 1553 DEBUG_l( Perl_deb(aTHX_ "(dopoptogiven(): found given at cx=%ld)\n", (long)i));
0d863452 1554 return i;
3b719c58
NC		 1555 case CXt_LOOP_PLAIN:
1556 assert(!CxFOREACHDEF(cx));
1557 break;
c6fdafd0 1558 case CXt_LOOP_LAZYIV:
d01136d6 1559 case CXt_LOOP_LAZYSV:
3b719c58 1560 case CXt_LOOP_FOR:
0d863452 1561 if (CxFOREACHDEF(cx)) {
1c98cc53 1562 DEBUG_l( Perl_deb(aTHX_ "(dopoptogiven(): found foreach at cx=%ld)\n", (long)i));
0d863452
RH		 1563 return i;
1564 }
1565 }
1566 }
1567 return i;
1568}
1569
1570STATIC I32
1571S_dopoptowhen(pTHX_ I32 startingblock)
1572{
97aff369 1573 dVAR;
0d863452
RH		 1574 I32 i;
1575 for (i = startingblock; i >= 0; i--) {
1576 register const PERL_CONTEXT *cx = &cxstack[i];
1577 switch (CxTYPE(cx)) {
1578 default:
1579 continue;
1580 case CXt_WHEN:
1c98cc53 1581 DEBUG_l( Perl_deb(aTHX_ "(dopoptowhen(): found when at cx=%ld)\n", (long)i));
0d863452
RH		 1582 return i;
1583 }
1584 }
1585 return i;
1586}
1587
a0d0e21e 1588void
864dbfa3 1589Perl_dounwind(pTHX_ I32 cxix)
a0d0e21e 1590{
97aff369 1591 dVAR;
a0d0e21e
LW		 1592 I32 optype;
1593
f144f1e3
DM		 1594 if (!PL_curstackinfo) /* can happen if die during thread cloning */
1595 return;
1596
a0d0e21e 1597 while (cxstack_ix > cxix) {
b0d9ce38 1598 SV *sv;
06b5626a 1599 register PERL_CONTEXT *cx = &cxstack[cxstack_ix];
1c98cc53 1600 DEBUG_CX("UNWIND"); \
a0d0e21e 1601 /* Note: we don't need to restore the base context info till the end. */
6b35e009 1602 switch (CxTYPE(cx)) {
c90c0ff4 1603 case CXt_SUBST:
1604 POPSUBST(cx);
1605 continue; /* not break */
a0d0e21e 1606 case CXt_SUB:
b0d9ce38
GS		 1607 POPSUB(cx,sv);
1608 LEAVESUB(sv);
a0d0e21e
LW		 1609 break;
1610 case CXt_EVAL:
1611 POPEVAL(cx);
1612 break;
c6fdafd0 1613 case CXt_LOOP_LAZYIV:
d01136d6 1614 case CXt_LOOP_LAZYSV:
3b719c58
NC		 1615 case CXt_LOOP_FOR:
1616 case CXt_LOOP_PLAIN:
a0d0e21e
LW		 1617 POPLOOP(cx);
1618 break;
0a753a76 1619 case CXt_NULL:
a0d0e21e 1620 break;
7766f137
GS		 1621 case CXt_FORMAT:
1622 POPFORMAT(cx);
1623 break;
a0d0e21e 1624 }
c90c0ff4 1625 cxstack_ix--;
a0d0e21e 1626 }
1b6737cc 1627 PERL_UNUSED_VAR(optype);
a0d0e21e
LW		 1628}
1629
5a844595
GS		 1630void
1631Perl_qerror(pTHX_ SV *err)
1632{
97aff369 1633 dVAR;
7918f24d
NC		 1634
1635 PERL_ARGS_ASSERT_QERROR;
1636
6b2fb389
DM		 1637 if (PL_in_eval) {
1638 if (PL_in_eval & EVAL_KEEPERR) {
1639 Perl_ck_warner(aTHX_ packWARN(WARN_MISC), "\t(in cleanup) %s",
1640 SvPV_nolen_const(err));
1641 }
1642 else
1643 sv_catsv(ERRSV, err);
1644 }
5a844595
GS		 1645 else if (PL_errors)
1646 sv_catsv(PL_errors, err);
1647 else
be2597df 1648 Perl_warn(aTHX_ "%"SVf, SVfARG(err));
13765c85
DM		 1649 if (PL_parser)
1650 ++PL_parser->error_count;
5a844595
GS		 1651}
1652
bb4c52e0 1653void
c5df3096 1654Perl_die_unwind(pTHX_ SV *msv)
a0d0e21e 1655{
27da23d5 1656 dVAR;
c5df3096 1657 SV *exceptsv = sv_mortalcopy(msv);
96d9b9cd 1658 U8 in_eval = PL_in_eval;
c5df3096 1659 PERL_ARGS_ASSERT_DIE_UNWIND;
87582a92 1660
96d9b9cd 1661 if (in_eval) {
a0d0e21e 1662 I32 cxix;
a0d0e21e 1663 I32 gimme;
a0d0e21e 1664
22a30693
Z		 1665 /*
1666 * Historically, perl used to set ERRSV ($@) early in the die
1667 * process and rely on it not getting clobbered during unwinding.
1668 * That sucked, because it was liable to get clobbered, so the
1669 * setting of ERRSV used to emit the exception from eval{} has
1670 * been moved to much later, after unwinding (see just before
1671 * JMPENV_JUMP below). However, some modules were relying on the
1672 * early setting, by examining $@ during unwinding to use it as
1673 * a flag indicating whether the current unwinding was caused by
1674 * an exception. It was never a reliable flag for that purpose,
1675 * being totally open to false positives even without actual
1676 * clobberage, but was useful enough for production code to
1677 * semantically rely on it.
1678 *
1679 * We'd like to have a proper introspective interface that
1680 * explicitly describes the reason for whatever unwinding
1681 * operations are currently in progress, so that those modules
1682 * work reliably and $@ isn't further overloaded. But we don't
1683 * have one yet. In its absence, as a stopgap measure, ERRSV is
1684 * now *additionally* set here, before unwinding, to serve as the
1685 * (unreliable) flag that it used to.
1686 *
1687 * This behaviour is temporary, and should be removed when a
1688 * proper way to detect exceptional unwinding has been developed.
1689 * As of 2010-12, the authors of modules relying on the hack
1690 * are aware of the issue, because the modules failed on
1691 * perls 5.13.{1..7} which had late setting of $@ without this
1692 * early-setting hack.
1693 */
1694 if (!(in_eval & EVAL_KEEPERR)) {
1695 SvTEMP_off(exceptsv);
1696 sv_setsv(ERRSV, exceptsv);
1697 }
1698
5a844595
GS		 1699 while ((cxix = dopoptoeval(cxstack_ix)) < 0
1700 && PL_curstackinfo->si_prev)
1701 {
bac4b2ad 1702 dounwind(-1);
d3acc0f7 1703 POPSTACK;
bac4b2ad 1704 }
e336de0d 1705
a0d0e21e
LW		 1706 if (cxix >= 0) {
1707 I32 optype;
b6494f15 1708 SV *namesv;
35a4481c 1709 register PERL_CONTEXT *cx;
901017d6 1710 SV **newsp;
8f89e5a9
Z		 1711 COP *oldcop;
1712 JMPENV *restartjmpenv;
1713 OP *restartop;
a0d0e21e
LW		 1714
1715 if (cxix < cxstack_ix)
1716 dounwind(cxix);
1717
3280af22 1718 POPBLOCK(cx,PL_curpm);
6b35e009 1719 if (CxTYPE(cx) != CXt_EVAL) {
7d0994e0 1720 STRLEN msglen;
96d9b9cd 1721 const char* message = SvPVx_const(exceptsv, msglen);
10edeb5d 1722 PerlIO_write(Perl_error_log, (const char *)"panic: die ", 11);
bf49b057 1723 PerlIO_write(Perl_error_log, message, msglen);
a0d0e21e
LW		 1724 my_exit(1);
1725 }
1726 POPEVAL(cx);
b6494f15 1727 namesv = cx->blk_eval.old_namesv;
8f89e5a9
Z		 1728 oldcop = cx->blk_oldcop;
1729 restartjmpenv = cx->blk_eval.cur_top_env;
1730 restartop = cx->blk_eval.retop;
a0d0e21e
LW		 1731
1732 if (gimme == G_SCALAR)
3280af22
NIS		 1733 *++newsp = &PL_sv_undef;
1734 PL_stack_sp = newsp;
a0d0e21e
LW		 1735
1736 LEAVE;
748a9306 1737
7fb6a879
GS		 1738 /* LEAVE could clobber PL_curcop (see save_re_context())
1739 * XXX it might be better to find a way to avoid messing with
1740 * PL_curcop in save_re_context() instead, but this is a more
1741 * minimal fix --GSAR */
8f89e5a9 1742 PL_curcop = oldcop;
7fb6a879 1743
7a2e2cd6 1744 if (optype == OP_REQUIRE) {
96d9b9cd 1745 const char* const msg = SvPVx_nolen_const(exceptsv);
b6494f15
VP		 1746 (void)hv_store(GvHVn(PL_incgv),
1747 SvPVX_const(namesv), SvCUR(namesv),
27bcc0a7 1748 &PL_sv_undef, 0);
27e90453
DM		 1749 /* note that unlike pp_entereval, pp_require isn't
1750 * supposed to trap errors. So now that we've popped the
1751 * EVAL that pp_require pushed, and processed the error
1752 * message, rethrow the error */
9fed9930
NC		 1753 Perl_croak(aTHX_ "%sCompilation failed in require",
1754 *msg ? msg : "Unknown error\n");
7a2e2cd6 1755 }
c5df3096 1756 if (in_eval & EVAL_KEEPERR) {
7ce09284
Z		 1757 Perl_ck_warner(aTHX_ packWARN(WARN_MISC), "\t(in cleanup) %s",
1758 SvPV_nolen_const(exceptsv));
96d9b9cd
Z		 1759 }
1760 else {
1761 sv_setsv(ERRSV, exceptsv);
1762 }
8f89e5a9
Z		 1763 PL_restartjmpenv = restartjmpenv;
1764 PL_restartop = restartop;
bb4c52e0
GG		 1765 JMPENV_JUMP(3);
1766 /* NOTREACHED */
a0d0e21e
LW		 1767 }
1768 }
87582a92 1769
96d9b9cd 1770 write_to_stderr(exceptsv);
f86702cc 1771 my_failure_exit();
1772 /* NOTREACHED */
a0d0e21e
LW		 1773}
1774
1775PP(pp_xor)
1776{
97aff369 1777 dVAR; dSP; dPOPTOPssrl;
a0d0e21e
LW		 1778 if (SvTRUE(left) != SvTRUE(right))
1779 RETSETYES;
1780 else
1781 RETSETNO;
1782}
1783
8dff4fc5
BM		 1784/*
1785=for apidoc caller_cx
1786
1787The XSUB-writer's equivalent of L<caller()|perlfunc/caller>. The
1788returned C<PERL_CONTEXT> structure can be interrogated to find all the
1789information returned to Perl by C<caller>. Note that XSUBs don't get a
1790stack frame, so C<caller_cx(0, NULL)> will return information for the
1791immediately-surrounding Perl code.
1792
1793This function skips over the automatic calls to C<&DB::sub> made on the
1794behalf of the debugger. If the stack frame requested was a sub called by
1795C<DB::sub>, the return value will be the frame for the call to
1796C<DB::sub>, since that has the correct line number/etc. for the call
1797site. If I<dbcxp> is non-C<NULL>, it will be set to a pointer to the
1798frame for the sub call itself.
1799
1800=cut
1801*/
1802
1803const PERL_CONTEXT *
1804Perl_caller_cx(pTHX_ I32 count, const PERL_CONTEXT **dbcxp)
a0d0e21e 1805{
a0d0e21e 1806 register I32 cxix = dopoptosub(cxstack_ix);
901017d6
AL		 1807 register const PERL_CONTEXT *cx;
1808 register const PERL_CONTEXT *ccstack = cxstack;
1809 const PERL_SI *top_si = PL_curstackinfo;
27d41816 1810
a0d0e21e 1811 for (;;) {
2c375eb9
GS		 1812 /* we may be in a higher stacklevel, so dig down deeper */
1813 while (cxix < 0 && top_si->si_type != PERLSI_MAIN) {
1814 top_si = top_si->si_prev;
1815 ccstack = top_si->si_cxstack;
1816 cxix = dopoptosub_at(ccstack, top_si->si_cxix);
1817 }
8dff4fc5
BM		 1818 if (cxix < 0)
1819 return NULL;
f2a7f298
DG		 1820 /* caller() should not report the automatic calls to &DB::sub */
1821 if (PL_DBsub && GvCV(PL_DBsub) && cxix >= 0 &&
3280af22 1822 ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))
a0d0e21e
LW		 1823 count++;
1824 if (!count--)
1825 break;
2c375eb9 1826 cxix = dopoptosub_at(ccstack, cxix - 1);
a0d0e21e 1827 }
2c375eb9
GS		 1828
1829 cx = &ccstack[cxix];
8dff4fc5
BM		 1830 if (dbcxp) *dbcxp = cx;
1831
7766f137 1832 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
f54cb97a 1833 const I32 dbcxix = dopoptosub_at(ccstack, cxix - 1);
2c375eb9 1834 /* We expect that ccstack[dbcxix] is CXt_SUB, anyway, the
06a5b730 1835 field below is defined for any cx. */
f2a7f298
DG		 1836 /* caller() should not report the automatic calls to &DB::sub */
1837 if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub))
2c375eb9 1838 cx = &ccstack[dbcxix];
06a5b730 1839 }
1840
8dff4fc5
BM		 1841 return cx;
1842}
1843
1844PP(pp_caller)
1845{
1846 dVAR;
1847 dSP;
1848 register const PERL_CONTEXT *cx;
1849 const PERL_CONTEXT *dbcx;
1850 I32 gimme;
1851 const char *stashname;
1852 I32 count = 0;
1853
1854 if (MAXARG)
1855 count = POPi;
1856
1857 cx = caller_cx(count, &dbcx);
1858 if (!cx) {
1859 if (GIMME != G_ARRAY) {
1860 EXTEND(SP, 1);
1861 RETPUSHUNDEF;
1862 }
1863 RETURN;
1864 }
1865
ed094faf 1866 stashname = CopSTASHPV(cx->blk_oldcop);
a0d0e21e 1867 if (GIMME != G_ARRAY) {
27d41816 1868 EXTEND(SP, 1);
ed094faf 1869 if (!stashname)
3280af22 1870 PUSHs(&PL_sv_undef);
49d8d3a1
MB		 1871 else {
1872 dTARGET;
ed094faf 1873 sv_setpv(TARG, stashname);
49d8d3a1
MB		 1874 PUSHs(TARG);
1875 }
a0d0e21e
LW		 1876 RETURN;
1877 }
a0d0e21e 1878
b3ca2e83 1879 EXTEND(SP, 11);
27d41816 1880
ed094faf 1881 if (!stashname)
3280af22 1882 PUSHs(&PL_sv_undef);
49d8d3a1 1883 else
6e449a3a
MHM		 1884 mPUSHs(newSVpv(stashname, 0));
1885 mPUSHs(newSVpv(OutCopFILE(cx->blk_oldcop), 0));
1886 mPUSHi((I32)CopLINE(cx->blk_oldcop));
a0d0e21e
LW		 1887 if (!MAXARG)
1888 RETURN;
7766f137 1889 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
8dff4fc5 1890 GV * const cvgv = CvGV(dbcx->blk_sub.cv);
7766f137 1891 /* So is ccstack[dbcxix]. */
07b8c804 1892 if (isGV(cvgv)) {
561b68a9 1893 SV * const sv = newSV(0);
c445ea15 1894 gv_efullname3(sv, cvgv, NULL);
6e449a3a 1895 mPUSHs(sv);
bf38a478 1896 PUSHs(boolSV(CxHASARGS(cx)));
07b8c804
RGS		 1897 }
1898 else {
84bafc02 1899 PUSHs(newSVpvs_flags("(unknown)", SVs_TEMP));
bf38a478 1900 PUSHs(boolSV(CxHASARGS(cx)));
07b8c804 1901 }
a0d0e21e
LW		 1902 }
1903 else {
84bafc02 1904 PUSHs(newSVpvs_flags("(eval)", SVs_TEMP));
6e449a3a 1905 mPUSHi(0);
a0d0e21e 1906 }
54310121 1907 gimme = (I32)cx->blk_gimme;
1908 if (gimme == G_VOID)
3280af22 1909 PUSHs(&PL_sv_undef);
54310121 1910 else
98625aca 1911 PUSHs(boolSV((gimme & G_WANT) == G_ARRAY));
6b35e009 1912 if (CxTYPE(cx) == CXt_EVAL) {
811a4de9 1913 /* eval STRING */
85a64632 1914 if (CxOLD_OP_TYPE(cx) == OP_ENTEREVAL) {
4633a7c4 1915 PUSHs(cx->blk_eval.cur_text);
3280af22 1916 PUSHs(&PL_sv_no);
0f79a09d 1917 }
811a4de9 1918 /* require */
0f79a09d 1919 else if (cx->blk_eval.old_namesv) {
6e449a3a 1920 mPUSHs(newSVsv(cx->blk_eval.old_namesv));
3280af22 1921 PUSHs(&PL_sv_yes);
06a5b730 1922 }
811a4de9
GS		 1923 /* eval BLOCK (try blocks have old_namesv == 0) */
1924 else {
1925 PUSHs(&PL_sv_undef);
1926 PUSHs(&PL_sv_undef);
1927 }
4633a7c4 1928 }
a682de96
GS		 1929 else {
1930 PUSHs(&PL_sv_undef);
1931 PUSHs(&PL_sv_undef);
1932 }
bafb2adc 1933 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)
ed094faf 1934 && CopSTASH_eq(PL_curcop, PL_debstash))
4633a7c4 1935 {
66a1b24b
AL		 1936 AV * const ary = cx->blk_sub.argarray;
1937 const int off = AvARRAY(ary) - AvALLOC(ary);
a0d0e21e 1938
5b235299
NC		 1939 if (!PL_dbargs)
1940 Perl_init_dbargs(aTHX);
a0d0e21e 1941
3280af22
NIS		 1942 if (AvMAX(PL_dbargs) < AvFILLp(ary) + off)
1943 av_extend(PL_dbargs, AvFILLp(ary) + off);
1944 Copy(AvALLOC(ary), AvARRAY(PL_dbargs), AvFILLp(ary) + 1 + off, SV*);
1945 AvFILLp(PL_dbargs) = AvFILLp(ary) + off;
a0d0e21e 1946 }
f3aa04c2
GS		 1947 /* XXX only hints propagated via op_private are currently
1948 * visible (others are not easily accessible, since they
1949 * use the global PL_hints) */
6e449a3a 1950 mPUSHi(CopHINTS_get(cx->blk_oldcop));
e476b1b5
GS		 1951 {
1952 SV * mask ;
72dc9ed5 1953 STRLEN * const old_warnings = cx->blk_oldcop->cop_warnings ;
114bafba 1954
ac27b0f5 1955 if (old_warnings == pWARN_NONE ||
114bafba 1956 (old_warnings == pWARN_STD && (PL_dowarn & G_WARN_ON) == 0))
e476b1b5 1957 mask = newSVpvn(WARN_NONEstring, WARNsize) ;
ac27b0f5 1958 else if (old_warnings == pWARN_ALL ||
75b6c4ca
RGS		 1959 (old_warnings == pWARN_STD && PL_dowarn & G_WARN_ON)) {
1960 /* Get the bit mask for $warnings::Bits{all}, because
1961 * it could have been extended by warnings::register */
1962 SV **bits_all;
6673a63c 1963 HV * const bits = get_hv("warnings::Bits", 0);
017a3ce5 1964 if (bits && (bits_all=hv_fetchs(bits, "all", FALSE))) {
75b6c4ca
RGS		 1965 mask = newSVsv(*bits_all);
1966 }
1967 else {
1968 mask = newSVpvn(WARN_ALLstring, WARNsize) ;
1969 }
1970 }
e476b1b5 1971 else
72dc9ed5 1972 mask = newSVpvn((char *) (old_warnings + 1), old_warnings[0]);
6e449a3a 1973 mPUSHs(mask);
e476b1b5 1974 }
b3ca2e83 1975
c28fe1ec 1976 PUSHs(cx->blk_oldcop->cop_hints_hash ?
20439bc7 1977 sv_2mortal(newRV_noinc(MUTABLE_SV(cop_hints_2hv(cx->blk_oldcop, 0))))
b3ca2e83 1978 : &PL_sv_undef);
a0d0e21e
LW		 1979 RETURN;
1980}
1981
a0d0e21e
LW		 1982PP(pp_reset)
1983{
97aff369 1984 dVAR;
39644a26 1985 dSP;
10edeb5d 1986 const char * const tmps = (MAXARG < 1) ? (const char *)"" : POPpconstx;
11faa288 1987 sv_reset(tmps, CopSTASH(PL_curcop));
3280af22 1988 PUSHs(&PL_sv_yes);
a0d0e21e
LW		 1989 RETURN;
1990}
1991
dd2155a4
DM		 1992/* like pp_nextstate, but used instead when the debugger is active */
1993
a0d0e21e
LW		 1994PP(pp_dbstate)
1995{
27da23d5 1996 dVAR;
533c011a 1997 PL_curcop = (COP*)PL_op;
a0d0e21e 1998 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 1999 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e
LW		 2000 FREETMPS;
2001
f410a211
NC		 2002 PERL_ASYNC_CHECK();
2003
5df8de69
DM		 2004 if (PL_op->op_flags & OPf_SPECIAL /* breakpoint */
2005 || SvIV(PL_DBsingle) || SvIV(PL_DBsignal) || SvIV(PL_DBtrace))
a0d0e21e 2006 {
39644a26 2007 dSP;
c09156bb 2008 register PERL_CONTEXT *cx;
f54cb97a 2009 const I32 gimme = G_ARRAY;
eb160463 2010 U8 hasargs;
0bd48802
AL		 2011 GV * const gv = PL_DBgv;
2012 register CV * const cv = GvCV(gv);
a0d0e21e 2013
a0d0e21e 2014 if (!cv)
cea2e8a9 2015 DIE(aTHX_ "No DB::DB routine defined");
a0d0e21e 2016
aea4f609
DM		 2017 if (CvDEPTH(cv) >= 1 && !(PL_debug & DEBUG_DB_RECURSE_FLAG))
2018 /* don't do recursive DB::DB call */
a0d0e21e 2019 return NORMAL;
748a9306 2020
a57c6685 2021 ENTER;
4633a7c4
LW		 2022 SAVETMPS;
2023
3280af22 2024 SAVEI32(PL_debug);
55497cff 2025 SAVESTACK_POS();
3280af22 2026 PL_debug = 0;
748a9306 2027 hasargs = 0;
924508f0 2028 SPAGAIN;
748a9306 2029
aed2304a 2030 if (CvISXSUB(cv)) {
c127bd3a
SF		 2031 CvDEPTH(cv)++;
2032 PUSHMARK(SP);
2033 (void)(*CvXSUB(cv))(aTHX_ cv);
2034 CvDEPTH(cv)--;
2035 FREETMPS;
a57c6685 2036 LEAVE;
c127bd3a
SF		 2037 return NORMAL;
2038 }
2039 else {
2040 PUSHBLOCK(cx, CXt_SUB, SP);
2041 PUSHSUB_DB(cx);
2042 cx->blk_sub.retop = PL_op->op_next;
2043 CvDEPTH(cv)++;
2044 SAVECOMPPAD();
2045 PAD_SET_CUR_NOSAVE(CvPADLIST(cv), 1);
2046 RETURNOP(CvSTART(cv));
2047 }
a0d0e21e
LW		 2048 }
2049 else
2050 return NORMAL;
2051}
2052
b9d76716
VP		 2053STATIC SV **
2054S_adjust_stack_on_leave(pTHX_ SV **newsp, SV **sp, SV **mark, I32 gimme, U32 flags)
2055{
2056 PERL_ARGS_ASSERT_ADJUST_STACK_ON_LEAVE;
2057
2058 if (gimme == G_SCALAR) {
2059 if (MARK < SP)
2060 *++newsp = (SvFLAGS(*SP) & flags) ? *SP : sv_mortalcopy(*SP);
2061 else {
2062 /* MEXTEND() only updates MARK, so reuse it instead of newsp. */
2063 MARK = newsp;
2064 MEXTEND(MARK, 1);
2065 *++MARK = &PL_sv_undef;
2066 return MARK;
2067 }
2068 }
2069 else if (gimme == G_ARRAY) {
2070 /* in case LEAVE wipes old return values */
2071 while (++MARK <= SP) {
2072 if (SvFLAGS(*MARK) & flags)
2073 *++newsp = *MARK;
2074 else {
2075 *++newsp = sv_mortalcopy(*MARK);
2076 TAINT_NOT; /* Each item is independent */
2077 }
2078 }
2079 /* When this function was called with MARK == newsp, we reach this
2080 * point with SP == newsp. */
2081 }
2082
2083 return newsp;
2084}
2085
2b9a6457
VP		 2086PP(pp_enter)
2087{
2088 dVAR; dSP;
2089 register PERL_CONTEXT *cx;
7c2d9d03 2090 I32 gimme = GIMME_V;
2b9a6457
VP		 2091
2092 ENTER_with_name("block");
2093
2094 SAVETMPS;
2095 PUSHBLOCK(cx, CXt_BLOCK, SP);
2096
2097 RETURN;
2098}
2099
2100PP(pp_leave)
2101{
2102 dVAR; dSP;
2103 register PERL_CONTEXT *cx;
2104 SV **newsp;
2105 PMOP *newpm;
2106 I32 gimme;
2107
2108 if (PL_op->op_flags & OPf_SPECIAL) {
2109 cx = &cxstack[cxstack_ix];
2110 cx->blk_oldpm = PL_curpm; /* fake block should preserve $1 et al */
2111 }
2112
2113 POPBLOCK(cx,newpm);
2114
2115 gimme = OP_GIMME(PL_op, (cxstack_ix >= 0) ? gimme : G_SCALAR);
2116
2117 TAINT_NOT;
f02ea43c 2118 SP = adjust_stack_on_leave(newsp, SP, newsp, gimme, SVs_PADTMP|SVs_TEMP);
2b9a6457
VP		 2119 PL_curpm = newpm; /* Don't pop $1 et al till now */
2120
2121 LEAVE_with_name("block");
2122
2123 RETURN;
2124}
2125
a0d0e21e
LW		 2126PP(pp_enteriter)
2127{
27da23d5 2128 dVAR; dSP; dMARK;
c09156bb 2129 register PERL_CONTEXT *cx;
f54cb97a 2130 const I32 gimme = GIMME_V;
df530c37 2131 void *itervar; /* location of the iteration variable */
840fe433 2132 U8 cxtype = CXt_LOOP_FOR;
a0d0e21e 2133
d343c3ef 2134 ENTER_with_name("loop1");
4633a7c4
LW		 2135 SAVETMPS;
2136
aafca525
DM		 2137 if (PL_op->op_targ) { /* "my" variable */
2138 if (PL_op->op_private & OPpLVAL_INTRO) { /* for my $x (...) */
14f338dc
DM		 2139 SvPADSTALE_off(PAD_SVl(PL_op->op_targ));
2140 SAVESETSVFLAGS(PAD_SVl(PL_op->op_targ),
2141 SVs_PADSTALE, SVs_PADSTALE);
2142 }
09edbca0 2143 SAVEPADSVANDMORTALIZE(PL_op->op_targ);
89e00a7c 2144#ifdef USE_ITHREADS
df530c37 2145 itervar = PL_comppad;
89e00a7c 2146#else
aafca525 2147 itervar = &PAD_SVl(PL_op->op_targ);
7766f137 2148#endif
54b9620d 2149 }
aafca525 2150 else { /* symbol table variable */
159b6efe 2151 GV * const gv = MUTABLE_GV(POPs);
f83b46a0
DM		 2152 SV** svp = &GvSV(gv);
2153 save_pushptrptr(gv, SvREFCNT_inc(*svp), SAVEt_GVSV);
561b68a9 2154 *svp = newSV(0);
df530c37 2155 itervar = (void *)gv;
54b9620d 2156 }
4633a7c4 2157
0d863452
RH		 2158 if (PL_op->op_private & OPpITER_DEF)
2159 cxtype |= CXp_FOR_DEF;
2160
d343c3ef 2161 ENTER_with_name("loop2");
a0d0e21e 2162
7766f137 2163 PUSHBLOCK(cx, cxtype, SP);
df530c37 2164 PUSHLOOP_FOR(cx, itervar, MARK);
533c011a 2165 if (PL_op->op_flags & OPf_STACKED) {
d01136d6
BS		 2166 SV *maybe_ary = POPs;
2167 if (SvTYPE(maybe_ary) != SVt_PVAV) {
89ea2908 2168 dPOPss;
d01136d6 2169 SV * const right = maybe_ary;
984a4bea
RD		 2170 SvGETMAGIC(sv);
2171 SvGETMAGIC(right);
4fe3f0fa 2172 if (RANGE_IS_NUMERIC(sv,right)) {
d01136d6 2173 cx->cx_type &= ~CXTYPEMASK;
c6fdafd0
NC		 2174 cx->cx_type |= CXt_LOOP_LAZYIV;
2175 /* Make sure that no-one re-orders cop.h and breaks our
2176 assumptions */
2177 assert(CxTYPE(cx) == CXt_LOOP_LAZYIV);
a2309040
JH		 2178#ifdef NV_PRESERVES_UV
2179 if ((SvOK(sv) && ((SvNV(sv) < (NV)IV_MIN) ||
2180 (SvNV(sv) > (NV)IV_MAX)))
2181 ||
2182 (SvOK(right) && ((SvNV(right) > (NV)IV_MAX) ||
2183 (SvNV(right) < (NV)IV_MIN))))
2184#else
2185 if ((SvOK(sv) && ((SvNV(sv) <= (NV)IV_MIN)
2186 ||
2187 ((SvNV(sv) > 0) &&
2188 ((SvUV(sv) > (UV)IV_MAX) ||
2189 (SvNV(sv) > (NV)UV_MAX)))))
2190 ||
2191 (SvOK(right) && ((SvNV(right) <= (NV)IV_MIN)
2192 ||
2193 ((SvNV(right) > 0) &&
2194 ((SvUV(right) > (UV)IV_MAX) ||
2195 (SvNV(right) > (NV)UV_MAX))))))
2196#endif
076d9a11 2197 DIE(aTHX_ "Range iterator outside integer range");
d01136d6
BS		 2198 cx->blk_loop.state_u.lazyiv.cur = SvIV(sv);
2199 cx->blk_loop.state_u.lazyiv.end = SvIV(right);
d4665a05
DM		 2200#ifdef DEBUGGING
2201 /* for correct -Dstv display */
2202 cx->blk_oldsp = sp - PL_stack_base;
2203#endif
89ea2908 2204 }
3f63a782 2205 else {
d01136d6
BS		 2206 cx->cx_type &= ~CXTYPEMASK;
2207 cx->cx_type |= CXt_LOOP_LAZYSV;
2208 /* Make sure that no-one re-orders cop.h and breaks our
2209 assumptions */
2210 assert(CxTYPE(cx) == CXt_LOOP_LAZYSV);
2211 cx->blk_loop.state_u.lazysv.cur = newSVsv(sv);
2212 cx->blk_loop.state_u.lazysv.end = right;
2213 SvREFCNT_inc(right);
2214 (void) SvPV_force_nolen(cx->blk_loop.state_u.lazysv.cur);
267cc4a8
NC		 2215 /* This will do the upgrade to SVt_PV, and warn if the value
2216 is uninitialised. */
10516c54 2217 (void) SvPV_nolen_const(right);
267cc4a8
NC		 2218 /* Doing this avoids a check every time in pp_iter in pp_hot.c
2219 to replace !SvOK() with a pointer to "". */
2220 if (!SvOK(right)) {
2221 SvREFCNT_dec(right);
d01136d6 2222 cx->blk_loop.state_u.lazysv.end = &PL_sv_no;
267cc4a8 2223 }
3f63a782 2224 }
89ea2908 2225 }
d01136d6 2226 else /* SvTYPE(maybe_ary) == SVt_PVAV */ {
502c6561 2227 cx->blk_loop.state_u.ary.ary = MUTABLE_AV(maybe_ary);
d01136d6
BS		 2228 SvREFCNT_inc(maybe_ary);
2229 cx->blk_loop.state_u.ary.ix =
2230 (PL_op->op_private & OPpITER_REVERSED) ?
2231 AvFILL(cx->blk_loop.state_u.ary.ary) + 1 :
2232 -1;
ef3e5ea9 2233 }
89ea2908 2234 }
d01136d6
BS		 2235 else { /* iterating over items on the stack */
2236 cx->blk_loop.state_u.ary.ary = NULL; /* means to use the stack */
ef3e5ea9 2237 if (PL_op->op_private & OPpITER_REVERSED) {
d01136d6 2238 cx->blk_loop.state_u.ary.ix = cx->blk_oldsp + 1;
ef3e5ea9
NC		 2239 }
2240 else {
d01136d6 2241 cx->blk_loop.state_u.ary.ix = MARK - PL_stack_base;
ef3e5ea9 2242 }
4633a7c4 2243 }
a0d0e21e
LW		 2244
2245 RETURN;
2246}
2247
2248PP(pp_enterloop)
2249{
27da23d5 2250 dVAR; dSP;
c09156bb 2251 register PERL_CONTEXT *cx;
f54cb97a 2252 const I32 gimme = GIMME_V;
a0d0e21e 2253
d343c3ef 2254 ENTER_with_name("loop1");
a0d0e21e 2255 SAVETMPS;
d343c3ef 2256 ENTER_with_name("loop2");
a0d0e21e 2257
3b719c58
NC		 2258 PUSHBLOCK(cx, CXt_LOOP_PLAIN, SP);
2259 PUSHLOOP_PLAIN(cx, SP);
a0d0e21e
LW		 2260
2261 RETURN;
2262}
2263
2264PP(pp_leaveloop)
2265{
27da23d5 2266 dVAR; dSP;
c09156bb 2267 register PERL_CONTEXT *cx;
a0d0e21e
LW		 2268 I32 gimme;
2269 SV **newsp;
2270 PMOP *newpm;
2271 SV **mark;
2272
2273 POPBLOCK(cx,newpm);
3b719c58 2274 assert(CxTYPE_is_LOOP(cx));
4fdae800 2275 mark = newsp;
a8bba7fa 2276 newsp = PL_stack_base + cx->blk_loop.resetsp;
f86702cc 2277
a1f49e72 2278 TAINT_NOT;
b9d76716 2279 SP = adjust_stack_on_leave(newsp, SP, MARK, gimme, 0);
f86702cc 2280 PUTBACK;
2281
a8bba7fa 2282 POPLOOP(cx); /* Stack values are safe: release loop vars ... */
3280af22 2283 PL_curpm = newpm; /* ... and pop $1 et al */
f86702cc 2284
d343c3ef
GG		 2285 LEAVE_with_name("loop2");
2286 LEAVE_with_name("loop1");
a0d0e21e 2287
f86702cc 2288 return NORMAL;
a0d0e21e
LW		 2289}
2290
3bdf583b
FC		 2291STATIC void
2292S_return_lvalues(pTHX_ SV **mark, SV **sp, SV **newsp, I32 gimme,
d25b0d7b 2293 PERL_CONTEXT *cx, PMOP *newpm)
3bdf583b 2294{
80422e24 2295 const bool ref = !!(CxLVAL(cx) & OPpENTERSUB_INARGS);
3bdf583b 2296 if (gimme == G_SCALAR) {
d25b0d7b
FC		 2297 if (CxLVAL(cx) && !ref) { /* Leave it as it is if we can. */
2298 SV *sv;
2299 if (MARK < SP) {
2300 assert(MARK+1 == SP);
2301 if ((SvPADTMP(TOPs) ||
2302 (SvFLAGS(TOPs) & (SVf_READONLY | SVf_FAKE))
2303 == SVf_READONLY
2304 ) &&
2305 !SvSMAGICAL(TOPs)) {
2306 LEAVE;
2307 cxstack_ix--;
2308 POPSUB(cx,sv);
2309 PL_curpm = newpm;
2310 LEAVESUB(sv);
2311 Perl_croak(aTHX_
2312 "Can't return %s from lvalue subroutine",
2313 SvREADONLY(TOPs) ? (TOPs == &PL_sv_undef) ? "undef"
2314 : "a readonly value" : "a temporary");
2315 }
a5ad7a5a 2316 goto copy_sv;
d25b0d7b
FC		 2317 }
2318 else {
2319 /* sub:lvalue{} will take us here. */
2320 LEAVE;
2321 cxstack_ix--;
2322 POPSUB(cx,sv);
2323 PL_curpm = newpm;
2324 LEAVESUB(sv);
2325 Perl_croak(aTHX_
2326 /* diag_listed_as: Can't return %s from lvalue subroutine*/
2327 "Can't return undef from lvalue subroutine"
2328 );
2329 }
2330 }
93905212 2331 if (MARK < SP) {
a5ad7a5a 2332 copy_sv:
3bdf583b
FC		 2333 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
2334 *++newsp = SvREFCNT_inc(*SP);
2335 FREETMPS;
2336 sv_2mortal(*newsp);
2337 }
2338 else
e08be60b 2339 *++newsp =
e08be60b
FC		 2340 !SvTEMP(*SP)
2341 ? sv_2mortal(SvREFCNT_inc_simple_NN(*SP))
2342 : *SP;
3bdf583b 2343 }
0d235c77
FC		 2344 else {
2345 EXTEND(newsp,1);
3bdf583b 2346 *++newsp = &PL_sv_undef;
0d235c77 2347 }
767eda44
FC		 2348 if (CxLVAL(cx) & OPpENTERSUB_DEREF) {
2349 SvGETMAGIC(TOPs);
2350 if (!SvOK(TOPs)) {
2351 U8 deref_type;
2352 if (cx->blk_sub.retop->op_type == OP_RV2SV)
2353 deref_type = OPpDEREF_SV;
2354 else if (cx->blk_sub.retop->op_type == OP_RV2AV)
2355 deref_type = OPpDEREF_AV;
2356 else {
2357 assert(cx->blk_sub.retop->op_type == OP_RV2HV);
2358 deref_type = OPpDEREF_HV;
2359 }
2360 vivify_ref(TOPs, deref_type);
2361 }
2362 }
3bdf583b
FC		 2363 }
2364 else if (gimme == G_ARRAY) {
767eda44 2365 assert (!(CxLVAL(cx) & OPpENTERSUB_DEREF));
80422e24 2366 if (ref || !CxLVAL(cx))
e08be60b
FC		 2367 while (++MARK <= SP)
2368 *++newsp =
2369 SvTEMP(*MARK)
2370 ? *MARK
80422e24
FC		 2371 : ref && SvFLAGS(*MARK) & SVs_PADTMP
2372 ? sv_mortalcopy(*MARK)
2373 : sv_2mortal(SvREFCNT_inc_simple_NN(*MARK));
e08be60b 2374 else while (++MARK <= SP) {
d25b0d7b
FC		 2375 if (*MARK != &PL_sv_undef
2376 && (SvPADTMP(*MARK)
2377 || (SvFLAGS(*MARK) & (SVf_READONLY|SVf_FAKE))
2378 == SVf_READONLY
2379 )
2380 ) {
2381 SV *sv;
2382 /* Might be flattened array after $#array = */
2383 PUTBACK;
2384 LEAVE;
2385 cxstack_ix--;
2386 POPSUB(cx,sv);
2387 PL_curpm = newpm;
2388 LEAVESUB(sv);
2389 Perl_croak(aTHX_
2390 "Can't return a %s from lvalue subroutine",
2391 SvREADONLY(TOPs) ? "readonly value" : "temporary");
2392 }
2393 else
4bee03f8
FC		 2394 *++newsp =
2395 SvTEMP(*MARK)
2396 ? *MARK
2397 : sv_2mortal(SvREFCNT_inc_simple_NN(*MARK));
3bdf583b
FC		 2398 }
2399 }
2400 PL_stack_sp = newsp;
2401}
2402
a0d0e21e
LW		 2403PP(pp_return)
2404{
27da23d5 2405 dVAR; dSP; dMARK;
c09156bb 2406 register PERL_CONTEXT *cx;
f86702cc 2407 bool popsub2 = FALSE;
b45de488 2408 bool clear_errsv = FALSE;
fa1e92c4 2409 bool lval = FALSE;
767eda44 2410 bool gmagic = FALSE;
a0d0e21e
LW		 2411 I32 gimme;
2412 SV **newsp;
2413 PMOP *newpm;
2414 I32 optype = 0;
b6494f15 2415 SV *namesv;
b0d9ce38 2416 SV *sv;
b263a1ad 2417 OP *retop = NULL;
a0d0e21e 2418
0bd48802
AL		 2419 const I32 cxix = dopoptosub(cxstack_ix);
2420
9850bf21
RH		 2421 if (cxix < 0) {
2422 if (CxMULTICALL(cxstack)) { /* In this case we must be in a
2423 * sort block, which is a CXt_NULL
2424 * not a CXt_SUB */
2425 dounwind(0);
d7507f74
RH		 2426 PL_stack_base[1] = *PL_stack_sp;
2427 PL_stack_sp = PL_stack_base + 1;
a0d0e21e
LW		 2428 return 0;
2429 }
9850bf21
RH		 2430 else
2431 DIE(aTHX_ "Can't return outside a subroutine");
a0d0e21e 2432 }
a0d0e21e
LW		 2433 if (cxix < cxstack_ix)
2434 dounwind(cxix);
2435
d7507f74
RH		 2436 if (CxMULTICALL(&cxstack[cxix])) {
2437 gimme = cxstack[cxix].blk_gimme;
2438 if (gimme == G_VOID)
2439 PL_stack_sp = PL_stack_base;
2440 else if (gimme == G_SCALAR) {
2441 PL_stack_base[1] = *PL_stack_sp;
2442 PL_stack_sp = PL_stack_base + 1;
2443 }
9850bf21 2444 return 0;
d7507f74 2445 }
9850bf21 2446
a0d0e21e 2447 POPBLOCK(cx,newpm);
6b35e009 2448 switch (CxTYPE(cx)) {
a0d0e21e 2449 case CXt_SUB:
f86702cc 2450 popsub2 = TRUE;
fa1e92c4 2451 lval = !!CvLVALUE(cx->blk_sub.cv);
f39bc417 2452 retop = cx->blk_sub.retop;
767eda44 2453 gmagic = CxLVAL(cx) & OPpENTERSUB_DEREF;
5dd42e15 2454 cxstack_ix++; /* preserve cx entry on stack for use by POPSUB */
a0d0e21e
LW		 2455 break;
2456 case CXt_EVAL:
b45de488
GS		 2457 if (!(PL_in_eval & EVAL_KEEPERR))
2458 clear_errsv = TRUE;
a0d0e21e 2459 POPEVAL(cx);
b6494f15 2460 namesv = cx->blk_eval.old_namesv;
f39bc417 2461 retop = cx->blk_eval.retop;
1d76a5c3
GS		 2462 if (CxTRYBLOCK(cx))
2463 break;
748a9306
LW		 2464 if (optype == OP_REQUIRE &&
2465 (MARK == SP || (gimme == G_SCALAR && !SvTRUE(*SP))) )
2466 {
54310121 2467 /* Unassume the success we assumed earlier. */
b6494f15
VP		 2468 (void)hv_delete(GvHVn(PL_incgv),
2469 SvPVX_const(namesv), SvCUR(namesv),
2470 G_DISCARD);
2471 DIE(aTHX_ "%"SVf" did not return a true value", SVfARG(namesv));
748a9306 2472 }
a0d0e21e 2473 break;
7766f137
GS		 2474 case CXt_FORMAT:
2475 POPFORMAT(cx);
f39bc417 2476 retop = cx->blk_sub.retop;
7766f137 2477 break;
a0d0e21e 2478 default:
cea2e8a9 2479 DIE(aTHX_ "panic: return");
a0d0e21e
LW		 2480 }
2481
a1f49e72 2482 TAINT_NOT;
d25b0d7b 2483 if (lval) S_return_lvalues(aTHX_ MARK, SP, newsp, gimme, cx, newpm);
3bdf583b
FC		 2484 else {
2485 if (gimme == G_SCALAR) {
a29cdaf0
IZ		 2486 if (MARK < SP) {
2487 if (popsub2) {
a8bba7fa 2488 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
3ed94dc0 2489 if (SvTEMP(TOPs) && SvREFCNT(TOPs) == 1) {
a29cdaf0
IZ		 2490 *++newsp = SvREFCNT_inc(*SP);
2491 FREETMPS;
2492 sv_2mortal(*newsp);
959e3673
GS		 2493 }
2494 else {
2495 sv = SvREFCNT_inc(*SP); /* FREETMPS could clobber it */
a29cdaf0 2496 FREETMPS;
959e3673
GS		 2497 *++newsp = sv_mortalcopy(sv);
2498 SvREFCNT_dec(sv);
767eda44 2499 if (gmagic) SvGETMAGIC(sv);
a29cdaf0 2500 }
959e3673 2501 }
3ed94dc0 2502 else if (SvTEMP(*SP) && SvREFCNT(*SP) == 1) {
767eda44
FC		 2503 *++newsp = *SP;
2504 if (gmagic) SvGETMAGIC(*SP);
2505 }
959e3673 2506 else
767eda44 2507 *++newsp = sv_mortalcopy(*SP);
959e3673
GS		 2508 }
2509 else
a29cdaf0 2510 *++newsp = sv_mortalcopy(*SP);
959e3673
GS		 2511 }
2512 else
3280af22 2513 *++newsp = &PL_sv_undef;
3bdf583b
FC		 2514 }
2515 else if (gimme == G_ARRAY) {
a1f49e72 2516 while (++MARK <= SP) {
3ed94dc0 2517 *++newsp = popsub2 && SvTEMP(*MARK) && SvREFCNT(*MARK) == 1
f86702cc 2518 ? *MARK : sv_mortalcopy(*MARK);
a1f49e72
CS		 2519 TAINT_NOT; /* Each item is independent */
2520 }
3bdf583b
FC		 2521 }
2522 PL_stack_sp = newsp;
a0d0e21e 2523 }
a0d0e21e 2524
5dd42e15 2525 LEAVE;
f86702cc 2526 /* Stack values are safe: */
2527 if (popsub2) {
5dd42e15 2528 cxstack_ix--;
b0d9ce38 2529 POPSUB(cx,sv); /* release CV and @_ ... */
f86702cc 2530 }
b0d9ce38 2531 else
c445ea15 2532 sv = NULL;
3280af22 2533 PL_curpm = newpm; /* ... and pop $1 et al */
f86702cc 2534
b0d9ce38 2535 LEAVESUB(sv);
8433848b 2536 if (clear_errsv) {
ab69dbc2 2537 CLEAR_ERRSV();
8433848b 2538 }
f39bc417 2539 return retop;
a0d0e21e
LW		 2540}
2541
4f443c3d
FC		 2542/* This duplicates parts of pp_leavesub, so that it can share code with
2543 * pp_return */
2544PP(pp_leavesublv)
2545{
2546 dVAR; dSP;
4f443c3d
FC		 2547 SV **newsp;
2548 PMOP *newpm;
2549 I32 gimme;
2550 register PERL_CONTEXT *cx;
2551 SV *sv;
2552
2553 if (CxMULTICALL(&cxstack[cxstack_ix]))
2554 return 0;
2555
2556 POPBLOCK(cx,newpm);
2557 cxstack_ix++; /* temporarily protect top context */
2558 assert(CvLVALUE(cx->blk_sub.cv));
2559
2560 TAINT_NOT;
2561
0d235c77 2562 S_return_lvalues(aTHX_ newsp, SP, newsp, gimme, cx, newpm);
4f443c3d
FC		 2563
2564 LEAVE;
2565 cxstack_ix--;
2566 POPSUB(cx,sv); /* Stack values are safe: release CV and @_ ... */
2567 PL_curpm = newpm; /* ... and pop $1 et al */
2568
2569 LEAVESUB(sv);
2570 return cx->blk_sub.retop;
2571}
2572
a0d0e21e
LW		 2573PP(pp_last)
2574{
27da23d5 2575 dVAR; dSP;
a0d0e21e 2576 I32 cxix;
c09156bb 2577 register PERL_CONTEXT *cx;
f86702cc 2578 I32 pop2 = 0;
a0d0e21e 2579 I32 gimme;
8772537c 2580 I32 optype;
b263a1ad 2581 OP *nextop = NULL;
a0d0e21e
LW		 2582 SV **newsp;
2583 PMOP *newpm;
a8bba7fa 2584 SV **mark;
c445ea15 2585 SV *sv = NULL;
9d4ba2ae 2586
a0d0e21e 2587
533c011a 2588 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e
LW		 2589 cxix = dopoptoloop(cxstack_ix);
2590 if (cxix < 0)
a651a37d 2591 DIE(aTHX_ "Can't \"last\" outside a loop block");
a0d0e21e
LW		 2592 }
2593 else {
2594 cxix = dopoptolabel(cPVOP->op_pv);
2595 if (cxix < 0)
cea2e8a9 2596 DIE(aTHX_ "Label not found for \"last %s\"", cPVOP->op_pv);
a0d0e21e
LW		 2597 }
2598 if (cxix < cxstack_ix)
2599 dounwind(cxix);
2600
2601 POPBLOCK(cx,newpm);
5dd42e15 2602 cxstack_ix++; /* temporarily protect top context */
a8bba7fa 2603 mark = newsp;
6b35e009 2604 switch (CxTYPE(cx)) {
c6fdafd0 2605 case CXt_LOOP_LAZYIV:
d01136d6 2606 case CXt_LOOP_LAZYSV:
3b719c58
NC		 2607 case CXt_LOOP_FOR:
2608 case CXt_LOOP_PLAIN:
2609 pop2 = CxTYPE(cx);
a8bba7fa 2610 newsp = PL_stack_base + cx->blk_loop.resetsp;
022eaa24 2611 nextop = cx->blk_loop.my_op->op_lastop->op_next;
a0d0e21e 2612 break;
f86702cc 2613 case CXt_SUB:
f86702cc 2614 pop2 = CXt_SUB;
f39bc417 2615 nextop = cx->blk_sub.retop;
a0d0e21e 2616 break;
f86702cc 2617 case CXt_EVAL:
2618 POPEVAL(cx);
f39bc417 2619 nextop = cx->blk_eval.retop;
a0d0e21e 2620 break;
7766f137
GS		 2621 case CXt_FORMAT:
2622 POPFORMAT(cx);
f39bc417 2623 nextop = cx->blk_sub.retop;
7766f137 2624 break;
a0d0e21e 2625 default:
cea2e8a9 2626 DIE(aTHX_ "panic: last");
a0d0e21e
LW		 2627 }
2628
a1f49e72 2629 TAINT_NOT;
b9d76716
VP		 2630 SP = adjust_stack_on_leave(newsp, SP, MARK, gimme,
2631 pop2 == CXt_SUB ? SVs_TEMP : 0);
f86702cc 2632 PUTBACK;
2633
5dd42e15
DM		 2634 LEAVE;
2635 cxstack_ix--;
f86702cc 2636 /* Stack values are safe: */
2637 switch (pop2) {
c6fdafd0 2638 case CXt_LOOP_LAZYIV:
3b719c58 2639 case CXt_LOOP_PLAIN:
d01136d6 2640 case CXt_LOOP_LAZYSV:
3b719c58 2641 case CXt_LOOP_FOR:
a8bba7fa 2642 POPLOOP(cx); /* release loop vars ... */
4fdae800 2643 LEAVE;
f86702cc 2644 break;
2645 case CXt_SUB:
b0d9ce38 2646 POPSUB(cx,sv); /* release CV and @_ ... */
f86702cc 2647 break;
a0d0e21e 2648 }
3280af22 2649 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e 2650
b0d9ce38 2651 LEAVESUB(sv);
9d4ba2ae
AL		 2652 PERL_UNUSED_VAR(optype);
2653 PERL_UNUSED_VAR(gimme);
f86702cc 2654 return nextop;
a0d0e21e
LW		 2655}
2656
2657PP(pp_next)
2658{
27da23d5 2659 dVAR;
a0d0e21e 2660 I32 cxix;
c09156bb 2661 register PERL_CONTEXT *cx;
85538317 2662 I32 inner;
a0d0e21e 2663
533c011a 2664 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e
LW		 2665 cxix = dopoptoloop(cxstack_ix);
2666 if (cxix < 0)
a651a37d 2667 DIE(aTHX_ "Can't \"next\" outside a loop block");
a0d0e21e
LW		 2668 }
2669 else {
2670 cxix = dopoptolabel(cPVOP->op_pv);
2671 if (cxix < 0)
cea2e8a9 2672 DIE(aTHX_ "Label not found for \"next %s\"", cPVOP->op_pv);
a0d0e21e
LW		 2673 }
2674 if (cxix < cxstack_ix)
2675 dounwind(cxix);
2676
85538317
GS		 2677 /* clear off anything above the scope we're re-entering, but
2678 * save the rest until after a possible continue block */
2679 inner = PL_scopestack_ix;
1ba6ee2b 2680 TOPBLOCK(cx);
85538317
GS		 2681 if (PL_scopestack_ix < inner)
2682 leave_scope(PL_scopestack[PL_scopestack_ix]);
3a1b2b9e 2683 PL_curcop = cx->blk_oldcop;
d57ce4df 2684 return (cx)->blk_loop.my_op->op_nextop;
a0d0e21e
LW		 2685}
2686
2687PP(pp_redo)
2688{
27da23d5 2689 dVAR;
a0d0e21e 2690 I32 cxix;
c09156bb 2691 register PERL_CONTEXT *cx;
a0d0e21e 2692 I32 oldsave;
a034e688 2693 OP* redo_op;
a0d0e21e 2694
533c011a 2695 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e
LW		 2696 cxix = dopoptoloop(cxstack_ix);
2697 if (cxix < 0)
a651a37d 2698 DIE(aTHX_ "Can't \"redo\" outside a loop block");
a0d0e21e
LW		 2699 }
2700 else {
2701 cxix = dopoptolabel(cPVOP->op_pv);
2702 if (cxix < 0)
cea2e8a9 2703 DIE(aTHX_ "Label not found for \"redo %s\"", cPVOP->op_pv);
a0d0e21e
LW		 2704 }
2705 if (cxix < cxstack_ix)
2706 dounwind(cxix);
2707
022eaa24 2708 redo_op = cxstack[cxix].blk_loop.my_op->op_redoop;
a034e688
DM		 2709 if (redo_op->op_type == OP_ENTER) {
2710 /* pop one less context to avoid $x being freed in while (my $x..) */
2711 cxstack_ix++;
2712 assert(CxTYPE(&cxstack[cxstack_ix]) == CXt_BLOCK);
2713 redo_op = redo_op->op_next;
2714 }
2715
a0d0e21e 2716 TOPBLOCK(cx);
3280af22 2717 oldsave = PL_scopestack[PL_scopestack_ix - 1];
a0d0e21e 2718 LEAVE_SCOPE(oldsave);
936c78b5 2719 FREETMPS;
3a1b2b9e 2720 PL_curcop = cx->blk_oldcop;
a034e688 2721 return redo_op;
a0d0e21e
LW		 2722}
2723
0824fdcb 2724STATIC OP *
bfed75c6 2725S_dofindlabel(pTHX_ OP *o, const char *label, OP **opstack, OP **oplimit)
a0d0e21e 2726{
97aff369 2727 dVAR;
a0d0e21e 2728 OP **ops = opstack;
bfed75c6 2729 static const char too_deep[] = "Target of goto is too deeply nested";
a0d0e21e 2730
7918f24d
NC		 2731 PERL_ARGS_ASSERT_DOFINDLABEL;
2732
fc36a67e 2733 if (ops >= oplimit)
cea2e8a9 2734 Perl_croak(aTHX_ too_deep);
11343788
MB		 2735 if (o->op_type == OP_LEAVE ||
2736 o->op_type == OP_SCOPE ||
2737 o->op_type == OP_LEAVELOOP ||
33d34e4c 2738 o->op_type == OP_LEAVESUB ||
11343788 2739 o->op_type == OP_LEAVETRY)
fc36a67e 2740 {
5dc0d613 2741 *ops++ = cUNOPo->op_first;
fc36a67e 2742 if (ops >= oplimit)
cea2e8a9 2743 Perl_croak(aTHX_ too_deep);
fc36a67e 2744 }
c4aa4e48 2745 *ops = 0;
11343788 2746 if (o->op_flags & OPf_KIDS) {
aec46f14 2747 OP *kid;
a0d0e21e 2748 /* First try all the kids at this level, since that's likeliest. */
11343788 2749 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
7e8f1eac
AD		 2750 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) {
2751 const char *kid_label = CopLABEL(kCOP);
2752 if (kid_label && strEQ(kid_label, label))
2753 return kid;
2754 }
a0d0e21e 2755 }
11343788 2756 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
3280af22 2757 if (kid == PL_lastgotoprobe)
a0d0e21e 2758 continue;
ed8d0fe2
SM		 2759 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) {
2760 if (ops == opstack)
2761 *ops++ = kid;
2762 else if (ops[-1]->op_type == OP_NEXTSTATE ||
2763 ops[-1]->op_type == OP_DBSTATE)
2764 ops[-1] = kid;
2765 else
2766 *ops++ = kid;
2767 }
155aba94 2768 if ((o = dofindlabel(kid, label, ops, oplimit)))
11343788 2769 return o;
a0d0e21e
LW		 2770 }
2771 }
c4aa4e48 2772 *ops = 0;
a0d0e21e
LW		 2773 return 0;
2774}
2775
a0d0e21e
LW		 2776PP(pp_goto)
2777{
27da23d5 2778 dVAR; dSP;
cbbf8932 2779 OP *retop = NULL;
a0d0e21e 2780 I32 ix;
c09156bb 2781 register PERL_CONTEXT *cx;
fc36a67e 2782#define GOTO_DEPTH 64
2783 OP *enterops[GOTO_DEPTH];
cbbf8932 2784 const char *label = NULL;
bfed75c6
AL		 2785 const bool do_dump = (PL_op->op_type == OP_DUMP);
2786 static const char must_have_label[] = "goto must have label";
a0d0e21e 2787
533c011a 2788 if (PL_op->op_flags & OPf_STACKED) {
9d4ba2ae 2789 SV * const sv = POPs;
a0d0e21e
LW		 2790
2791 /* This egregious kludge implements goto &subroutine */
2792 if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVCV) {
2793 I32 cxix;
c09156bb 2794 register PERL_CONTEXT *cx;
ea726b52 2795 CV *cv = MUTABLE_CV(SvRV(sv));
a0d0e21e
LW		 2796 SV** mark;
2797 I32 items = 0;
2798 I32 oldsave;
b1464ded 2799 bool reified = 0;
a0d0e21e 2800
e8f7dd13 2801 retry:
4aa0a1f7 2802 if (!CvROOT(cv) && !CvXSUB(cv)) {
7fc63493 2803 const GV * const gv = CvGV(cv);
e8f7dd13 2804 if (gv) {
7fc63493 2805 GV *autogv;
e8f7dd13
GS		 2806 SV *tmpstr;
2807 /* autoloaded stub? */
2808 if (cv != GvCV(gv) && (cv = GvCV(gv)))
2809 goto retry;
2810 autogv = gv_autoload4(GvSTASH(gv), GvNAME(gv),
2811 GvNAMELEN(gv), FALSE);
2812 if (autogv && (cv = GvCV(autogv)))
2813 goto retry;
2814 tmpstr = sv_newmortal();
c445ea15 2815 gv_efullname3(tmpstr, gv, NULL);
be2597df 2816 DIE(aTHX_ "Goto undefined subroutine &%"SVf"", SVfARG(tmpstr));
4aa0a1f7 2817 }
cea2e8a9 2818 DIE(aTHX_ "Goto undefined subroutine");
4aa0a1f7
AD		 2819 }
2820
a0d0e21e 2821 /* First do some returnish stuff. */
b37c2d43 2822 SvREFCNT_inc_simple_void(cv); /* avoid premature free during unwind */
71fc2216 2823 FREETMPS;
a0d0e21e
LW		 2824 cxix = dopoptosub(cxstack_ix);
2825 if (cxix < 0)
cea2e8a9 2826 DIE(aTHX_ "Can't goto subroutine outside a subroutine");
a0d0e21e
LW		 2827 if (cxix < cxstack_ix)
2828 dounwind(cxix);
2829 TOPBLOCK(cx);
2d43a17f 2830 SPAGAIN;
564abe23 2831 /* ban goto in eval: see <20050521150056.GC20213@iabyn.com> */
2d43a17f 2832 if (CxTYPE(cx) == CXt_EVAL) {
c74ace89
DM		 2833 if (CxREALEVAL(cx))
2834 DIE(aTHX_ "Can't goto subroutine from an eval-string");
2835 else
2836 DIE(aTHX_ "Can't goto subroutine from an eval-block");
2d43a17f 2837 }
9850bf21
RH		 2838 else if (CxMULTICALL(cx))
2839 DIE(aTHX_ "Can't goto subroutine from a sort sub (or similar callback)");
bafb2adc 2840 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)) {
d8b46c1b 2841 /* put @_ back onto stack */
a0d0e21e 2842 AV* av = cx->blk_sub.argarray;
bfed75c6 2843
93965878 2844 items = AvFILLp(av) + 1;
a45cdc79
DM		 2845 EXTEND(SP, items+1); /* @_ could have been extended. */
2846 Copy(AvARRAY(av), SP + 1, items, SV*);
3280af22
NIS		 2847 SvREFCNT_dec(GvAV(PL_defgv));
2848 GvAV(PL_defgv) = cx->blk_sub.savearray;
b1464ded 2849 CLEAR_ARGARRAY(av);
d8b46c1b 2850 /* abandon @_ if it got reified */
62b1ebc2 2851 if (AvREAL(av)) {
b1464ded
DM		 2852 reified = 1;
2853 SvREFCNT_dec(av);
d8b46c1b
GS		 2854 av = newAV();
2855 av_extend(av, items-1);
11ca45c0 2856 AvREIFY_only(av);
ad64d0ec 2857 PAD_SVl(0) = MUTABLE_SV(cx->blk_sub.argarray = av);
62b1ebc2 2858 }
a0d0e21e 2859 }
aed2304a 2860 else if (CvISXSUB(cv)) { /* put GvAV(defgv) back onto stack */
890ce7af 2861 AV* const av = GvAV(PL_defgv);
1fa4e549 2862 items = AvFILLp(av) + 1;
a45cdc79
DM		 2863 EXTEND(SP, items+1); /* @_ could have been extended. */
2864 Copy(AvARRAY(av), SP + 1, items, SV*);
1fa4e549 2865 }
a45cdc79
DM		 2866 mark = SP;
2867 SP += items;
6b35e009 2868 if (CxTYPE(cx) == CXt_SUB &&
b150fb22 2869 !(CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth))
a0d0e21e 2870 SvREFCNT_dec(cx->blk_sub.cv);
3280af22 2871 oldsave = PL_scopestack[PL_scopestack_ix - 1];
a0d0e21e
LW		 2872 LEAVE_SCOPE(oldsave);
2873
2874 /* Now do some callish stuff. */
2875 SAVETMPS;
5023d17a 2876 SAVEFREESV(cv); /* later, undo the 'avoid premature free' hack */
aed2304a 2877 if (CvISXSUB(cv)) {
b37c2d43 2878 OP* const retop = cx->blk_sub.retop;
9410e98d
RB		 2879 SV **newsp __attribute__unused__;
2880 I32 gimme __attribute__unused__;
b1464ded
DM		 2881 if (reified) {
2882 I32 index;
2883 for (index=0; index<items; index++)
2884 sv_2mortal(SP[-index]);
2885 }
1fa4e549 2886
b37c2d43
AL		 2887 /* XS subs don't have a CxSUB, so pop it */
2888 POPBLOCK(cx, PL_curpm);
2889 /* Push a mark for the start of arglist */
2890 PUSHMARK(mark);
2891 PUTBACK;
2892 (void)(*CvXSUB(cv))(aTHX_ cv);
a57c6685 2893 LEAVE;
5eff7df7 2894 return retop;
a0d0e21e
LW		 2895 }
2896 else {
b37c2d43 2897 AV* const padlist = CvPADLIST(cv);
6b35e009 2898 if (CxTYPE(cx) == CXt_EVAL) {
85a64632 2899 PL_in_eval = CxOLD_IN_EVAL(cx);
3280af22 2900 PL_eval_root = cx->blk_eval.old_eval_root;
b150fb22 2901 cx->cx_type = CXt_SUB;
b150fb22 2902 }
a0d0e21e 2903 cx->blk_sub.cv = cv;
1a5b3db4 2904 cx->blk_sub.olddepth = CvDEPTH(cv);
dd2155a4 2905
a0d0e21e
LW		 2906 CvDEPTH(cv)++;
2907 if (CvDEPTH(cv) < 2)
74c765eb 2908 SvREFCNT_inc_simple_void_NN(cv);
dd2155a4 2909 else {
2b9dff67 2910 if (CvDEPTH(cv) == PERL_SUB_DEPTH_WARN && ckWARN(WARN_RECURSION))
44a8e56a 2911 sub_crush_depth(cv);
26019298 2912 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2913 }
fd617465
DM		 2914 SAVECOMPPAD();
2915 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
bafb2adc 2916 if (CxHASARGS(cx))
6d4ff0d2 2917 {
502c6561 2918 AV *const av = MUTABLE_AV(PAD_SVl(0));
a0d0e21e 2919
3280af22 2920 cx->blk_sub.savearray = GvAV(PL_defgv);
502c6561 2921 GvAV(PL_defgv) = MUTABLE_AV(SvREFCNT_inc_simple(av));
dd2155a4 2922 CX_CURPAD_SAVE(cx->blk_sub);
6d4ff0d2 2923 cx->blk_sub.argarray = av;
a0d0e21e
LW		 2924
2925 if (items >= AvMAX(av) + 1) {
b37c2d43 2926 SV **ary = AvALLOC(av);
a0d0e21e
LW		 2927 if (AvARRAY(av) != ary) {
2928 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
9c6bc640 2929 AvARRAY(av) = ary;
a0d0e21e
LW		 2930 }
2931 if (items >= AvMAX(av) + 1) {
2932 AvMAX(av) = items - 1;
2933 Renew(ary,items+1,SV*);
2934 AvALLOC(av) = ary;
9c6bc640 2935 AvARRAY(av) = ary;
a0d0e21e
LW		 2936 }
2937 }
a45cdc79 2938 ++mark;
a0d0e21e 2939 Copy(mark,AvARRAY(av),items,SV*);
93965878 2940 AvFILLp(av) = items - 1;
d8b46c1b 2941 assert(!AvREAL(av));
b1464ded
DM		 2942 if (reified) {
2943 /* transfer 'ownership' of refcnts to new @_ */
2944 AvREAL_on(av);
2945 AvREIFY_off(av);
2946 }
a0d0e21e
LW		 2947 while (items--) {
2948 if (*mark)
2949 SvTEMP_off(*mark);
2950 mark++;
2951 }
2952 }
491527d0 2953 if (PERLDB_SUB) { /* Checking curstash breaks DProf. */
005a8a35 2954 Perl_get_db_sub(aTHX_ NULL, cv);
b37c2d43 2955 if (PERLDB_GOTO) {
b96d8cd9 2956 CV * const gotocv = get_cvs("DB::goto", 0);
b37c2d43
AL		 2957 if (gotocv) {
2958 PUSHMARK( PL_stack_sp );
ad64d0ec 2959 call_sv(MUTABLE_SV(gotocv), G_SCALAR | G_NODEBUG);
b37c2d43
AL		 2960 PL_stack_sp--;
2961 }
491527d0 2962 }
1ce6579f 2963 }
a0d0e21e
LW		 2964 RETURNOP(CvSTART(cv));
2965 }
2966 }
1614b0e3 2967 else {
0510663f 2968 label = SvPV_nolen_const(sv);
1614b0e3 2969 if (!(do_dump || *label))
cea2e8a9 2970 DIE(aTHX_ must_have_label);
1614b0e3 2971 }
a0d0e21e 2972 }
533c011a 2973 else if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e 2974 if (! do_dump)
cea2e8a9 2975 DIE(aTHX_ must_have_label);
a0d0e21e
LW		 2976 }
2977 else
2978 label = cPVOP->op_pv;
2979
f410a211
NC		 2980 PERL_ASYNC_CHECK();
2981
a0d0e21e 2982 if (label && *label) {
cbbf8932 2983 OP *gotoprobe = NULL;
3b2447bc 2984 bool leaving_eval = FALSE;
33d34e4c 2985 bool in_block = FALSE;
cbbf8932 2986 PERL_CONTEXT *last_eval_cx = NULL;
a0d0e21e
LW		 2987
2988 /* find label */
2989
d4c19fe8 2990 PL_lastgotoprobe = NULL;
a0d0e21e
LW		 2991 *enterops = 0;
2992 for (ix = cxstack_ix; ix >= 0; ix--) {
2993 cx = &cxstack[ix];
6b35e009 2994 switch (CxTYPE(cx)) {
a0d0e21e 2995 case CXt_EVAL:
3b2447bc 2996 leaving_eval = TRUE;
971ecbe6 2997 if (!CxTRYBLOCK(cx)) {
a4f3a277
RH		 2998 gotoprobe = (last_eval_cx ?
2999 last_eval_cx->blk_eval.old_eval_root :
3000 PL_eval_root);
3001 last_eval_cx = cx;
9c5794fe
RH		 3002 break;
3003 }
3004 /* else fall through */
c6fdafd0 3005 case CXt_LOOP_LAZYIV:
d01136d6 3006 case CXt_LOOP_LAZYSV:
3b719c58
NC		 3007 case CXt_LOOP_FOR:
3008 case CXt_LOOP_PLAIN:
bb5aedc1
VP		 3009 case CXt_GIVEN:
3010 case CXt_WHEN:
a0d0e21e
LW		 3011 gotoprobe = cx->blk_oldcop->op_sibling;
3012 break;
3013 case CXt_SUBST:
3014 continue;
3015 case CXt_BLOCK:
33d34e4c 3016 if (ix) {
a0d0e21e 3017 gotoprobe = cx->blk_oldcop->op_sibling;
33d34e4c
AE		 3018 in_block = TRUE;
3019 } else
3280af22 3020 gotoprobe = PL_main_root;
a0d0e21e 3021 break;
b3933176 3022 case CXt_SUB:
9850bf21 3023 if (CvDEPTH(cx->blk_sub.cv) && !CxMULTICALL(cx)) {
b3933176
CS		 3024 gotoprobe = CvROOT(cx->blk_sub.cv);
3025 break;
3026 }
3027 /* FALL THROUGH */
7766f137 3028 case CXt_FORMAT:
0a753a76 3029 case CXt_NULL:
a651a37d 3030 DIE(aTHX_ "Can't \"goto\" out of a pseudo block");
a0d0e21e
LW		 3031 default:
3032 if (ix)
cea2e8a9 3033 DIE(aTHX_ "panic: goto");
3280af22 3034 gotoprobe = PL_main_root;
a0d0e21e
LW		 3035 break;
3036 }
2b597662
GS		 3037 if (gotoprobe) {
3038 retop = dofindlabel(gotoprobe, label,
3039 enterops, enterops + GOTO_DEPTH);
3040 if (retop)
3041 break;
eae48c89
Z		 3042 if (gotoprobe->op_sibling &&
3043 gotoprobe->op_sibling->op_type == OP_UNSTACK &&
3044 gotoprobe->op_sibling->op_sibling) {
3045 retop = dofindlabel(gotoprobe->op_sibling->op_sibling,
3046 label, enterops, enterops + GOTO_DEPTH);
3047 if (retop)
3048 break;
3049 }
2b597662 3050 }
3280af22 3051 PL_lastgotoprobe = gotoprobe;
a0d0e21e
LW		 3052 }
3053 if (!retop)
cea2e8a9 3054 DIE(aTHX_ "Can't find label %s", label);
a0d0e21e 3055
3b2447bc
RH		 3056 /* if we're leaving an eval, check before we pop any frames
3057 that we're not going to punt, otherwise the error
3058 won't be caught */
3059
3060 if (leaving_eval && *enterops && enterops[1]) {
3061 I32 i;
3062 for (i = 1; enterops[i]; i++)
3063 if (enterops[i]->op_type == OP_ENTERITER)
3064 DIE(aTHX_ "Can't \"goto\" into the middle of a foreach loop");
3065 }
3066
b500e03b
GG		 3067 if (*enterops && enterops[1]) {
3068 I32 i = enterops[1]->op_type == OP_ENTER && in_block ? 2 : 1;
3069 if (enterops[i])
3070 deprecate("\"goto\" to jump into a construct");
3071 }
3072
a0d0e21e
LW		 3073 /* pop unwanted frames */
3074
3075 if (ix < cxstack_ix) {
3076 I32 oldsave;
3077
3078 if (ix < 0)
3079 ix = 0;
3080 dounwind(ix);
3081 TOPBLOCK(cx);
3280af22 3082 oldsave = PL_scopestack[PL_scopestack_ix];
a0d0e21e
LW		 3083 LEAVE_SCOPE(oldsave);
3084 }
3085
3086 /* push wanted frames */
3087
748a9306 3088 if (*enterops && enterops[1]) {
0bd48802 3089 OP * const oldop = PL_op;
33d34e4c
AE		 3090 ix = enterops[1]->op_type == OP_ENTER && in_block ? 2 : 1;
3091 for (; enterops[ix]; ix++) {
533c011a 3092 PL_op = enterops[ix];
84902520
TB		 3093 /* Eventually we may want to stack the needed arguments
3094 * for each op. For now, we punt on the hard ones. */
533c011a 3095 if (PL_op->op_type == OP_ENTERITER)
894356b3 3096 DIE(aTHX_ "Can't \"goto\" into the middle of a foreach loop");
16c91539 3097 PL_op->op_ppaddr(aTHX);
a0d0e21e 3098 }
533c011a 3099 PL_op = oldop;
a0d0e21e
LW		 3100 }
3101 }
3102
3103 if (do_dump) {
a5f75d66 3104#ifdef VMS
6b88bc9c 3105 if (!retop) retop = PL_main_start;
a5f75d66 3106#endif
3280af22
NIS		 3107 PL_restartop = retop;
3108 PL_do_undump = TRUE;
a0d0e21e
LW		 3109
3110 my_unexec();
3111
3280af22
NIS		 3112 PL_restartop = 0; /* hmm, must be GNU unexec().. */
3113 PL_do_undump = FALSE;
a0d0e21e
LW		 3114 }
3115
3116 RETURNOP(retop);
3117}
3118
3119PP(pp_exit)
3120{
97aff369 3121 dVAR;
39644a26 3122 dSP;
a0d0e21e
LW		 3123 I32 anum;
3124
3125 if (MAXARG < 1)
3126 anum = 0;
ff0cee69 3127 else {
a0d0e21e 3128 anum = SvIVx(POPs);
d98f61e7
GS		 3129#ifdef VMS
3130 if (anum == 1 && (PL_op->op_private & OPpEXIT_VMSISH))
ff0cee69 3131 anum = 0;
96e176bf 3132 VMSISH_HUSHED = VMSISH_HUSHED || (PL_op->op_private & OPpHUSH_VMSISH);
ff0cee69 3133#endif
3134 }
cc3604b1 3135 PL_exit_flags |= PERL_EXIT_EXPECTED;
81d86705
NC		 3136#ifdef PERL_MAD
3137 /* KLUDGE: disable exit 0 in BEGIN blocks when we're just compiling */
3138 if (anum || !(PL_minus_c && PL_madskills))
3139 my_exit(anum);
3140#else
a0d0e21e 3141 my_exit(anum);
81d86705 3142#endif
3280af22 3143 PUSHs(&PL_sv_undef);
a0d0e21e
LW		 3144 RETURN;
3145}
3146
a0d0e21e
LW		 3147/* Eval. */
3148
0824fdcb 3149STATIC void
cea2e8a9 3150S_save_lines(pTHX_ AV *array, SV *sv)
a0d0e21e 3151{
504618e9 3152 const char *s = SvPVX_const(sv);
890ce7af 3153 const char * const send = SvPVX_const(sv) + SvCUR(sv);
504618e9 3154 I32 line = 1;
a0d0e21e 3155
7918f24d
NC		 3156 PERL_ARGS_ASSERT_SAVE_LINES;
3157
a0d0e21e 3158 while (s && s < send) {
f54cb97a 3159 const char *t;
b9f83d2f 3160 SV * const tmpstr = newSV_type(SVt_PVMG);
a0d0e21e 3161
1d963ff3 3162 t = (const char *)memchr(s, '\n', send - s);
a0d0e21e
LW		 3163 if (t)
3164 t++;
3165 else
3166 t = send;
3167
3168 sv_setpvn(tmpstr, s, t - s);
3169 av_store(array, line++, tmpstr);
3170 s = t;
3171 }
3172}
3173
22f16304
RU		 3174/*
3175=for apidoc docatch
3176
3177Check for the cases 0 or 3 of cur_env.je_ret, only used inside an eval context.
3178
31790 is used as continue inside eval,
3180
31813 is used for a die caught by an inner eval - continue inner loop
3182
3183See cop.h: je_mustcatch, when set at any runlevel to TRUE, means eval ops must
3184establish a local jmpenv to handle exception traps.
3185
3186=cut
3187*/
0824fdcb 3188STATIC OP *
cea2e8a9 3189S_docatch(pTHX_ OP *o)
1e422769 3190{
97aff369 3191 dVAR;
6224f72b 3192 int ret;
06b5626a 3193 OP * const oldop = PL_op;
db36c5a1 3194 dJMPENV;
1e422769 3195
1e422769 3196#ifdef DEBUGGING
54310121 3197 assert(CATCH_GET == TRUE);
1e422769 3198#endif
312caa8e 3199 PL_op = o;
8bffa5f8 3200
14dd3ad8 3201 JMPENV_PUSH(ret);
6224f72b 3202 switch (ret) {
312caa8e 3203 case 0:
abd70938
DM		 3204 assert(cxstack_ix >= 0);
3205 assert(CxTYPE(&cxstack[cxstack_ix]) == CXt_EVAL);
3206 cxstack[cxstack_ix].blk_eval.cur_top_env = PL_top_env;
14dd3ad8 3207 redo_body:
85aaa934 3208 CALLRUNOPS(aTHX);
312caa8e
CS		 3209 break;
3210 case 3:
8bffa5f8 3211 /* die caught by an inner eval - continue inner loop */
febb3a6d
Z		 3212 if (PL_restartop && PL_restartjmpenv == PL_top_env) {
3213 PL_restartjmpenv = NULL;
312caa8e
CS		 3214 PL_op = PL_restartop;
3215 PL_restartop = 0;
3216 goto redo_body;
3217 }
3218 /* FALL THROUGH */
3219 default:
14dd3ad8 3220 JMPENV_POP;
533c011a 3221 PL_op = oldop;
6224f72b 3222 JMPENV_JUMP(ret);
1e422769 3223 /* NOTREACHED */
1e422769 3224 }
14dd3ad8 3225 JMPENV_POP;
533c011a 3226 PL_op = oldop;
5f66b61c 3227 return NULL;
1e422769 3228}
3229
ee23ad3b
NC		 3230/* James Bond: Do you expect me to talk?
3231 Auric Goldfinger: No, Mr. Bond. I expect you to die.
3232
3233 This code is an ugly hack, doesn't work with lexicals in subroutines that are
3234 called more than once, and is only used by regcomp.c, for (?{}) blocks.
3235
3236 Currently it is not used outside the core code. Best if it stays that way.
d59a8b3e
NC		 3237
3238 Hence it's now deprecated, and will be removed.
ee23ad3b 3239*/
c277df42 3240OP *
bfed75c6 3241Perl_sv_compile_2op(pTHX_ SV *sv, OP** startop, const char *code, PAD** padp)
c277df42
IZ		 3242/* sv Text to convert to OP tree. */
3243/* startop op_free() this to undo. */
3244/* code Short string id of the caller. */
3245{
d59a8b3e
NC		 3246 PERL_ARGS_ASSERT_SV_COMPILE_2OP;
3247 return Perl_sv_compile_2op_is_broken(aTHX_ sv, startop, code, padp);
3248}
3249
3250/* Don't use this. It will go away without warning once the regexp engine is
3251 refactored not to use it. */
3252OP *
3253Perl_sv_compile_2op_is_broken(pTHX_ SV *sv, OP **startop, const char *code,
3254 PAD **padp)
3255{
27da23d5 3256 dVAR; dSP; /* Make POPBLOCK work. */
c277df42
IZ		 3257 PERL_CONTEXT *cx;
3258 SV **newsp;
b094c71d 3259 I32 gimme = G_VOID;
c277df42
IZ		 3260 I32 optype;
3261 OP dummy;
83ee9e09
GS		 3262 char tbuf[TYPE_DIGITS(long) + 12 + 10];
3263 char *tmpbuf = tbuf;
c277df42 3264 char *safestr;
a3985cdc 3265 int runtime;
601f1833 3266 CV* runcv = NULL; /* initialise to avoid compiler warnings */
f7997f86 3267 STRLEN len;
634d6919 3268 bool need_catch;
c277df42 3269
d59a8b3e 3270 PERL_ARGS_ASSERT_SV_COMPILE_2OP_IS_BROKEN;
7918f24d 3271
d343c3ef 3272 ENTER_with_name("eval");
27fcb6ee 3273 lex_start(sv, NULL, LEX_START_SAME_FILTER);
c277df42
IZ		 3274 SAVETMPS;
3275 /* switch to eval mode */
3276
923e4eb5 3277 if (IN_PERL_COMPILETIME) {
f4dd75d9 3278 SAVECOPSTASH_FREE(&PL_compiling);
11faa288 3279 CopSTASH_set(&PL_compiling, PL_curstash);
cbce877f 3280 }
83ee9e09 3281 if (PERLDB_NAMEEVAL && CopLINE(PL_curcop)) {
9d4ba2ae 3282 SV * const sv = sv_newmortal();
83ee9e09
GS		 3283 Perl_sv_setpvf(aTHX_ sv, "_<(%.10seval %lu)[%s:%"IVdf"]",
3284 code, (unsigned long)++PL_evalseq,
3285 CopFILE(PL_curcop), (IV)CopLINE(PL_curcop));
3286 tmpbuf = SvPVX(sv);
fc009855 3287 len = SvCUR(sv);
83ee9e09
GS		 3288 }
3289 else
d9fad198
JH		 3290 len = my_snprintf(tmpbuf, sizeof(tbuf), "_<(%.10s_eval %lu)", code,
3291 (unsigned long)++PL_evalseq);
f4dd75d9 3292 SAVECOPFILE_FREE(&PL_compiling);
57843af0 3293 CopFILE_set(&PL_compiling, tmpbuf+2);
f4dd75d9 3294 SAVECOPLINE(&PL_compiling);
57843af0 3295 CopLINE_set(&PL_compiling, 1);
c277df42
IZ		 3296 /* XXX For C<eval "...">s within BEGIN {} blocks, this ends up
3297 deleting the eval's FILEGV from the stash before gv_check() runs
3298 (i.e. before run-time proper). To work around the coredump that
3299 ensues, we always turn GvMULTI_on for any globals that were
3300 introduced within evals. See force_ident(). GSAR 96-10-12 */
f7997f86
NC		 3301 safestr = savepvn(tmpbuf, len);
3302 SAVEDELETE(PL_defstash, safestr, len);
b3ac6de7 3303 SAVEHINTS();
d1ca3daa 3304#ifdef OP_IN_REGISTER
6b88bc9c 3305 PL_opsave = op;
d1ca3daa 3306#else
7766f137 3307 SAVEVPTR(PL_op);
d1ca3daa 3308#endif
c277df42 3309
a3985cdc 3310 /* we get here either during compilation, or via pp_regcomp at runtime */
923e4eb5 3311 runtime = IN_PERL_RUNTIME;
a3985cdc 3312 if (runtime)
558b4424 3313 {
d819b83a 3314 runcv = find_runcv(NULL);
a3985cdc 3315
558b4424
FC		 3316 /* At run time, we have to fetch the hints from PL_curcop. */
3317 PL_hints = PL_curcop->cop_hints;
3318 if (PL_hints & HINT_LOCALIZE_HH) {
3319 /* SAVEHINTS created a new HV in PL_hintgv, which we
3320 need to GC */
3321 SvREFCNT_dec(GvHV(PL_hintgv));
3322 GvHV(PL_hintgv) =
3323 refcounted_he_chain_2hv(PL_curcop->cop_hints_hash, 0);
3324 hv_magic(GvHV(PL_hintgv), NULL, PERL_MAGIC_hints);
3325 }
3326 SAVECOMPILEWARNINGS();
3327 PL_compiling.cop_warnings = DUP_WARNINGS(PL_curcop->cop_warnings);
3328 cophh_free(CopHINTHASH_get(&PL_compiling));
3329 /* XXX Does this need to avoid copying a label? */
3330 PL_compiling.cop_hints_hash
3331 = cophh_copy(PL_curcop->cop_hints_hash);
3332 }
3333
533c011a 3334 PL_op = &dummy;
13b51b79 3335 PL_op->op_type = OP_ENTEREVAL;
533c011a 3336 PL_op->op_flags = 0; /* Avoid uninit warning. */
923e4eb5 3337 PUSHBLOCK(cx, CXt_EVAL|(IN_PERL_COMPILETIME ? 0 : CXp_REAL), SP);
6b75f042 3338 PUSHEVAL(cx, 0);
634d6919
GG		 3339 need_catch = CATCH_GET;
3340 CATCH_SET(TRUE);
a3985cdc
DM		 3341
3342 if (runtime)
410be5db 3343 (void) doeval(G_SCALAR, startop, runcv, PL_curcop->cop_seq);
a3985cdc 3344 else
410be5db 3345 (void) doeval(G_SCALAR, startop, PL_compcv, PL_cop_seqmax);
634d6919 3346 CATCH_SET(need_catch);
13b51b79 3347 POPBLOCK(cx,PL_curpm);
e84b9f1f 3348 POPEVAL(cx);
c277df42
IZ		 3349
3350 (*startop)->op_type = OP_NULL;
22c35a8c 3351 (*startop)->op_ppaddr = PL_ppaddr[OP_NULL];
f3548bdc 3352 /* XXX DAPM do this properly one year */
502c6561 3353 *padp = MUTABLE_AV(SvREFCNT_inc_simple(PL_comppad));
d343c3ef 3354 LEAVE_with_name("eval");
923e4eb5 3355 if (IN_PERL_COMPILETIME)
623e6609 3356 CopHINTS_set(&PL_compiling, PL_hints);
d1ca3daa 3357#ifdef OP_IN_REGISTER
6b88bc9c 3358 op = PL_opsave;
d1ca3daa 3359#endif
9d4ba2ae
AL		 3360 PERL_UNUSED_VAR(newsp);
3361 PERL_UNUSED_VAR(optype);
3362
410be5db 3363 return PL_eval_start;
c277df42
IZ		 3364}
3365
a3985cdc
DM		 3366
3367/*
3368=for apidoc find_runcv
3369
3370Locate the CV corresponding to the currently executing sub or eval.
d819b83a
DM		 3371If db_seqp is non_null, skip CVs that are in the DB package and populate
3372*db_seqp with the cop sequence number at the point that the DB:: code was
3373entered. (allows debuggers to eval in the scope of the breakpoint rather
cf525c36 3374than in the scope of the debugger itself).
a3985cdc
DM		 3375
3376=cut
3377*/
3378
3379CV*
d819b83a 3380Perl_find_runcv(pTHX_ U32 *db_seqp)
a3985cdc 3381{
97aff369 3382 dVAR;
a3985cdc 3383 PERL_SI *si;
a3985cdc 3384
d819b83a
DM		 3385 if (db_seqp)
3386 *db_seqp = PL_curcop->cop_seq;
a3985cdc 3387 for (si = PL_curstackinfo; si; si = si->si_prev) {
06b5626a 3388 I32 ix;
a3985cdc 3389 for (ix = si->si_cxix; ix >= 0; ix--) {
06b5626a 3390 const PERL_CONTEXT *cx = &(si->si_cxstack[ix]);
d819b83a 3391 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
1b6737cc 3392 CV * const cv = cx->blk_sub.cv;
d819b83a
DM		 3393 /* skip DB:: code */
3394 if (db_seqp && PL_debstash && CvSTASH(cv) == PL_debstash) {
3395 *db_seqp = cx->blk_oldcop->cop_seq;
3396 continue;
3397 }
3398 return cv;
3399 }
a3985cdc
DM		 3400 else if (CxTYPE(cx) == CXt_EVAL && !CxTRYBLOCK(cx))
3401 return PL_compcv;
3402 }
3403 }
3404 return PL_main_cv;
3405}
3406
3407
27e90453
DM		 3408/* Run yyparse() in a setjmp wrapper. Returns:
3409 * 0: yyparse() successful
3410 * 1: yyparse() failed
3411 * 3: yyparse() died
3412 */
3413STATIC int
28ac2b49 3414S_try_yyparse(pTHX_ int gramtype)
27e90453
DM		 3415{
3416 int ret;
3417 dJMPENV;
3418
3419 assert(CxTYPE(&cxstack[cxstack_ix]) == CXt_EVAL);
3420 JMPENV_PUSH(ret);
3421 switch (ret) {
3422 case 0:
28ac2b49 3423 ret = yyparse(gramtype) ? 1 : 0;
27e90453
DM		 3424 break;
3425 case 3:
3426 break;
3427 default:
3428 JMPENV_POP;
3429 JMPENV_JUMP(ret);
3430 /* NOTREACHED */
3431 }
3432 JMPENV_POP;
3433 return ret;
3434}
3435
3436
a3985cdc
DM		 3437/* Compile a require/do, an eval '', or a /(?{...})/.
3438 * In the last case, startop is non-null, and contains the address of
3439 * a pointer that should be set to the just-compiled code.
3440 * outside is the lexically enclosing CV (if any) that invoked us.
410be5db
DM		 3441 * Returns a bool indicating whether the compile was successful; if so,
3442 * PL_eval_start contains the first op of the compiled ocde; otherwise,
3443 * pushes undef (also croaks if startop != NULL).
a3985cdc
DM		 3444 */
3445
410be5db 3446STATIC bool
a3985cdc 3447S_doeval(pTHX_ int gimme, OP** startop, CV* outside, U32 seq)
a0d0e21e 3448{
27da23d5 3449 dVAR; dSP;
46c461b5 3450 OP * const saveop = PL_op;
27e90453
DM		 3451 bool in_require = (saveop && saveop->op_type == OP_REQUIRE);
3452 int yystatus;
a0d0e21e 3453
27e90453 3454 PL_in_eval = (in_require
6dc8a9e4
IZ		 3455 ? (EVAL_INREQUIRE | (PL_in_eval & EVAL_INEVAL))
3456 : EVAL_INEVAL);
a0d0e21e 3457
1ce6579f 3458 PUSHMARK(SP);
3459
3280af22 3460 SAVESPTR(PL_compcv);
ea726b52 3461 PL_compcv = MUTABLE_CV(newSV_type(SVt_PVCV));
1aff0e91 3462 CvEVAL_on(PL_compcv);
2090ab20
JH		 3463 assert(CxTYPE(&cxstack[cxstack_ix]) == CXt_EVAL);
3464 cxstack[cxstack_ix].blk_eval.cv = PL_compcv;
3465
a3985cdc 3466 CvOUTSIDE_SEQ(PL_compcv) = seq;
ea726b52 3467 CvOUTSIDE(PL_compcv) = MUTABLE_CV(SvREFCNT_inc_simple(outside));
a3985cdc 3468
dd2155a4 3469 /* set up a scratch pad */
a0d0e21e 3470
dd2155a4 3471 CvPADLIST(PL_compcv) = pad_new(padnew_SAVE);
cecbe010 3472 PL_op = NULL; /* avoid PL_op and PL_curpad referring to different CVs */
2c05e328 3473
07055b4c 3474
81d86705
NC		 3475 if (!PL_madskills)
3476 SAVEMORTALIZESV(PL_compcv); /* must remain until end of current statement */