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Perl_die_unwind(): remove unneeded assert
[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{
39644a26 43 dSP;
a0d0e21e 44 I32 cxix;
93f0bc49 45 const PERL_CONTEXT *cx;
a0d0e21e
LW
46 EXTEND(SP, 1);
47
93f0bc49
FC
48 if (PL_op->op_private & OPpOFFBYONE) {
49 if (!(cx = caller_cx(1,NULL))) RETPUSHUNDEF;
50 }
51 else {
52 cxix = dopoptosub(cxstack_ix);
53 if (cxix < 0)
a0d0e21e 54 RETPUSHUNDEF;
93f0bc49
FC
55 cx = &cxstack[cxix];
56 }
a0d0e21e 57
93f0bc49 58 switch (cx->blk_gimme) {
54310121 59 case G_ARRAY:
a0d0e21e 60 RETPUSHYES;
54310121 61 case G_SCALAR:
a0d0e21e 62 RETPUSHNO;
54310121
PP
63 default:
64 RETPUSHUNDEF;
65 }
a0d0e21e
LW
66}
67
2cd61cdb
IZ
68PP(pp_regcreset)
69{
0b4182de 70 TAINT_NOT;
2cd61cdb
IZ
71 return NORMAL;
72}
73
b3eb6a9b
GS
74PP(pp_regcomp)
75{
39644a26 76 dSP;
eb578fdb 77 PMOP *pm = (PMOP*)cLOGOP->op_other;
9f141731 78 SV **args;
df787a7b 79 int nargs;
84679df5 80 REGEXP *re = NULL;
9f141731
DM
81 REGEXP *new_re;
82 const regexp_engine *eng;
dbc200c5 83 bool is_bare_re= FALSE;
bfed75c6 84
df787a7b
DM
85 if (PL_op->op_flags & OPf_STACKED) {
86 dMARK;
87 nargs = SP - MARK;
88 args = ++MARK;
89 }
90 else {
91 nargs = 1;
92 args = SP;
93 }
94
4b5a0d1c 95 /* prevent recompiling under /o and ithreads. */
3db8f154 96#if defined(USE_ITHREADS)
131b3ad0 97 if (pm->op_pmflags & PMf_KEEP && PM_GETRE(pm)) {
df787a7b 98 SP = args-1;
131b3ad0
DM
99 RETURN;
100 }
513629ba 101#endif
d4b87e75 102
9f141731
DM
103 re = PM_GETRE(pm);
104 assert (re != (REGEXP*) &PL_sv_undef);
105 eng = re ? RX_ENGINE(re) : current_re_engine();
106
dbc200c5
YO
107 /*
108 In the below logic: these are basically the same - check if this regcomp is part of a split.
109
110 (PL_op->op_pmflags & PMf_split )
111 (PL_op->op_next->op_type == OP_PUSHRE)
112
113 We could add a new mask for this and copy the PMf_split, if we did
114 some bit definition fiddling first.
115
116 For now we leave this
117 */
118
3c13cae6
DM
119 new_re = (eng->op_comp
120 ? eng->op_comp
121 : &Perl_re_op_compile
122 )(aTHX_ args, nargs, pm->op_code_list, eng, re,
346d3070 123 &is_bare_re,
dbc200c5 124 (pm->op_pmflags & RXf_PMf_FLAGCOPYMASK),
a5ae69f0
DM
125 pm->op_pmflags |
126 (PL_op->op_flags & OPf_SPECIAL ? PMf_USE_RE_EVAL : 0));
dbc200c5 127
346d3070 128 if (pm->op_pmflags & PMf_HAS_CV)
8d919b0a 129 ReANY(new_re)->qr_anoncv
9fe3265f 130 = (CV*) SvREFCNT_inc(PAD_SV(PL_op->op_targ));
9f141731
DM
131
132 if (is_bare_re) {
133 REGEXP *tmp;
134 /* The match's LHS's get-magic might need to access this op's regexp
135 (e.g. $' =~ /$re/ while foo; see bug 70764). So we must call
136 get-magic now before we replace the regexp. Hopefully this hack can
137 be replaced with the approach described at
138 http://www.nntp.perl.org/group/perl.perl5.porters/2007/03/msg122415.html
139 some day. */
140 if (pm->op_type == OP_MATCH) {
141 SV *lhs;
284167a5 142 const bool was_tainted = TAINT_get;
9f141731
DM
143 if (pm->op_flags & OPf_STACKED)
144 lhs = args[-1];
6ffceeb7 145 else if (pm->op_targ)
9f141731
DM
146 lhs = PAD_SV(pm->op_targ);
147 else lhs = DEFSV;
148 SvGETMAGIC(lhs);
149 /* Restore the previous value of PL_tainted (which may have been
150 modified by get-magic), to avoid incorrectly setting the
284167a5
SM
151 RXf_TAINTED flag with RX_TAINT_on further down. */
152 TAINT_set(was_tainted);
dc6d7f5c 153#ifdef NO_TAINT_SUPPORT
9a9b5ec9
DM
154 PERL_UNUSED_VAR(was_tainted);
155#endif
df787a7b 156 }
9f141731
DM
157 tmp = reg_temp_copy(NULL, new_re);
158 ReREFCNT_dec(new_re);
159 new_re = tmp;
df787a7b 160 }
dbc200c5 161
9f141731
DM
162 if (re != new_re) {
163 ReREFCNT_dec(re);
164 PM_SETRE(pm, new_re);
c277df42 165 }
d4b87e75 166
dbc200c5 167
d48c660d
DM
168 assert(TAINTING_get || !TAINT_get);
169 if (TAINT_get) {
9f141731 170 SvTAINTED_on((SV*)new_re);
284167a5 171 RX_TAINT_on(new_re);
72311751 172 }
72311751 173
c737faaf
YO
174#if !defined(USE_ITHREADS)
175 /* can't change the optree at runtime either */
176 /* PMf_KEEP is handled differently under threads to avoid these problems */
9f141731
DM
177 if (!RX_PRELEN(PM_GETRE(pm)) && PL_curpm)
178 pm = PL_curpm;
a0d0e21e 179 if (pm->op_pmflags & PMf_KEEP) {
c90c0ff4 180 pm->op_private &= ~OPpRUNTIME; /* no point compiling again */
533c011a 181 cLOGOP->op_first->op_next = PL_op->op_next;
a0d0e21e 182 }
c737faaf 183#endif
9f141731 184
df787a7b 185 SP = args-1;
a0d0e21e
LW
186 RETURN;
187}
188
9f141731 189
a0d0e21e
LW
190PP(pp_substcont)
191{
39644a26 192 dSP;
eb578fdb
KW
193 PERL_CONTEXT *cx = &cxstack[cxstack_ix];
194 PMOP * const pm = (PMOP*) cLOGOP->op_other;
195 SV * const dstr = cx->sb_dstr;
196 char *s = cx->sb_s;
197 char *m = cx->sb_m;
a0d0e21e 198 char *orig = cx->sb_orig;
eb578fdb 199 REGEXP * const rx = cx->sb_rx;
c445ea15 200 SV *nsv = NULL;
988e6e7e 201 REGEXP *old = PM_GETRE(pm);
f410a211
NC
202
203 PERL_ASYNC_CHECK();
204
988e6e7e 205 if(old != rx) {
bfed75c6 206 if(old)
988e6e7e 207 ReREFCNT_dec(old);
d6106309 208 PM_SETRE(pm,ReREFCNT_inc(rx));
d8f2cf8a
AB
209 }
210
d9f97599 211 rxres_restore(&cx->sb_rxres, rx);
c90c0ff4 212
a0d0e21e 213 if (cx->sb_iters++) {
3c6ef0a5 214 const SSize_t saviters = cx->sb_iters;
a0d0e21e 215 if (cx->sb_iters > cx->sb_maxiters)
cea2e8a9 216 DIE(aTHX_ "Substitution loop");
a0d0e21e 217
447ee134
DM
218 SvGETMAGIC(TOPs); /* possibly clear taint on $1 etc: #67962 */
219
ef07e810 220 /* See "how taint works" above pp_subst() */
20be6587
DM
221 if (SvTAINTED(TOPs))
222 cx->sb_rxtainted |= SUBST_TAINT_REPL;
447ee134 223 sv_catsv_nomg(dstr, POPs);
2c296965 224 if (CxONCE(cx) || s < orig ||
03c83e26
DM
225 !CALLREGEXEC(rx, s, cx->sb_strend, orig,
226 (s == m), cx->sb_targ, NULL,
d5e7783a 227 (REXEC_IGNOREPOS|REXEC_NOT_FIRST|REXEC_FAIL_ON_UNDERFLOW)))
a0d0e21e 228 {
8ca8a454 229 SV *targ = cx->sb_targ;
748a9306 230
078c425b
JH
231 assert(cx->sb_strend >= s);
232 if(cx->sb_strend > s) {
233 if (DO_UTF8(dstr) && !SvUTF8(targ))
4bac9ae4 234 sv_catpvn_nomg_utf8_upgrade(dstr, s, cx->sb_strend - s, nsv);
078c425b 235 else
4bac9ae4 236 sv_catpvn_nomg(dstr, s, cx->sb_strend - s);
078c425b 237 }
20be6587
DM
238 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
239 cx->sb_rxtainted |= SUBST_TAINT_PAT;
9212bbba 240
8ca8a454
NC
241 if (pm->op_pmflags & PMf_NONDESTRUCT) {
242 PUSHs(dstr);
243 /* From here on down we're using the copy, and leaving the
244 original untouched. */
245 targ = dstr;
246 }
247 else {
9e0ea7f3
FC
248 SV_CHECK_THINKFIRST_COW_DROP(targ);
249 if (isGV(targ)) Perl_croak_no_modify();
250 SvPV_free(targ);
8ca8a454
NC
251 SvPV_set(targ, SvPVX(dstr));
252 SvCUR_set(targ, SvCUR(dstr));
253 SvLEN_set(targ, SvLEN(dstr));
254 if (DO_UTF8(dstr))
255 SvUTF8_on(targ);
256 SvPV_set(dstr, NULL);
257
52c47e16 258 PL_tainted = 0;
4f4d7508 259 mPUSHi(saviters - 1);
48c036b1 260
8ca8a454
NC
261 (void)SvPOK_only_UTF8(targ);
262 }
5cd24f17 263
20be6587 264 /* update the taint state of various various variables in
ef07e810
DM
265 * preparation for final exit.
266 * See "how taint works" above pp_subst() */
284167a5 267 if (TAINTING_get) {
20be6587
DM
268 if ((cx->sb_rxtainted & SUBST_TAINT_PAT) ||
269 ((cx->sb_rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
270 == (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
271 )
272 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
273
274 if (!(cx->sb_rxtainted & SUBST_TAINT_BOOLRET)
275 && (cx->sb_rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT))
276 )
277 SvTAINTED_on(TOPs); /* taint return value */
278 /* needed for mg_set below */
284167a5
SM
279 TAINT_set(
280 cBOOL(cx->sb_rxtainted &
281 (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL))
282 );
20be6587
DM
283 SvTAINT(TARG);
284 }
285 /* PL_tainted must be correctly set for this mg_set */
286 SvSETMAGIC(TARG);
287 TAINT_NOT;
80d88db0 288
8e7e33ef 289 CX_LEAVE_SCOPE(cx);
a0d0e21e 290 POPSUBST(cx);
5da525e9 291 CX_POP(cx);
80d88db0 292
47c9d59f 293 PERL_ASYNC_CHECK();
a0d0e21e 294 RETURNOP(pm->op_next);
e5964223 295 NOT_REACHED; /* NOTREACHED */
a0d0e21e 296 }
8e5e9ebe 297 cx->sb_iters = saviters;
a0d0e21e 298 }
07bc277f 299 if (RX_MATCH_COPIED(rx) && RX_SUBBEG(rx) != orig) {
a0d0e21e
LW
300 m = s;
301 s = orig;
6502e081 302 assert(!RX_SUBOFFSET(rx));
07bc277f 303 cx->sb_orig = orig = RX_SUBBEG(rx);
a0d0e21e
LW
304 s = orig + (m - s);
305 cx->sb_strend = s + (cx->sb_strend - m);
306 }
07bc277f 307 cx->sb_m = m = RX_OFFS(rx)[0].start + orig;
db79b45b 308 if (m > s) {
bfed75c6 309 if (DO_UTF8(dstr) && !SvUTF8(cx->sb_targ))
4bac9ae4 310 sv_catpvn_nomg_utf8_upgrade(dstr, s, m - s, nsv);
db79b45b 311 else
4bac9ae4 312 sv_catpvn_nomg(dstr, s, m-s);
db79b45b 313 }
07bc277f 314 cx->sb_s = RX_OFFS(rx)[0].end + orig;
084916e3 315 { /* Update the pos() information. */
8ca8a454
NC
316 SV * const sv
317 = (pm->op_pmflags & PMf_NONDESTRUCT) ? cx->sb_dstr : cx->sb_targ;
084916e3 318 MAGIC *mg;
a911bb25
DM
319
320 /* the string being matched against may no longer be a string,
321 * e.g. $_=0; s/.../$_++/ge */
322
323 if (!SvPOK(sv))
324 SvPV_force_nomg_nolen(sv);
325
96c2a8ff
FC
326 if (!(mg = mg_find_mglob(sv))) {
327 mg = sv_magicext_mglob(sv);
084916e3 328 }
cda67c99 329 MgBYTEPOS_set(mg, sv, SvPVX(sv), m - orig);
084916e3 330 }
988e6e7e 331 if (old != rx)
d6106309 332 (void)ReREFCNT_inc(rx);
20be6587 333 /* update the taint state of various various variables in preparation
ef07e810
DM
334 * for calling the code block.
335 * See "how taint works" above pp_subst() */
284167a5 336 if (TAINTING_get) {
20be6587
DM
337 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
338 cx->sb_rxtainted |= SUBST_TAINT_PAT;
339
340 if ((cx->sb_rxtainted & SUBST_TAINT_PAT) ||
341 ((cx->sb_rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
342 == (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
343 )
344 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
345
346 if (cx->sb_iters > 1 && (cx->sb_rxtainted &
347 (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL)))
8ca8a454
NC
348 SvTAINTED_on((pm->op_pmflags & PMf_NONDESTRUCT)
349 ? cx->sb_dstr : cx->sb_targ);
20be6587
DM
350 TAINT_NOT;
351 }
d9f97599 352 rxres_save(&cx->sb_rxres, rx);
af9838cc 353 PL_curpm = pm;
29f2e912 354 RETURNOP(pm->op_pmstashstartu.op_pmreplstart);
a0d0e21e
LW
355}
356
c90c0ff4 357void
864dbfa3 358Perl_rxres_save(pTHX_ void **rsp, REGEXP *rx)
c90c0ff4
PP
359{
360 UV *p = (UV*)*rsp;
361 U32 i;
7918f24d
NC
362
363 PERL_ARGS_ASSERT_RXRES_SAVE;
96a5add6 364 PERL_UNUSED_CONTEXT;
c90c0ff4 365
07bc277f 366 if (!p || p[1] < RX_NPARENS(rx)) {
db2c6cb3 367#ifdef PERL_ANY_COW
6502e081 368 i = 7 + (RX_NPARENS(rx)+1) * 2;
ed252734 369#else
6502e081 370 i = 6 + (RX_NPARENS(rx)+1) * 2;
ed252734 371#endif
c90c0ff4 372 if (!p)
a02a5408 373 Newx(p, i, UV);
c90c0ff4
PP
374 else
375 Renew(p, i, UV);
376 *rsp = (void*)p;
377 }
378
5eabab15
DM
379 /* what (if anything) to free on croak */
380 *p++ = PTR2UV(RX_MATCH_COPIED(rx) ? RX_SUBBEG(rx) : NULL);
cf93c79d 381 RX_MATCH_COPIED_off(rx);
6c31ff74 382 *p++ = RX_NPARENS(rx);
c90c0ff4 383
db2c6cb3 384#ifdef PERL_ANY_COW
bdd9a1b1
NC
385 *p++ = PTR2UV(RX_SAVED_COPY(rx));
386 RX_SAVED_COPY(rx) = NULL;
ed252734
NC
387#endif
388
07bc277f
NC
389 *p++ = PTR2UV(RX_SUBBEG(rx));
390 *p++ = (UV)RX_SUBLEN(rx);
6502e081
DM
391 *p++ = (UV)RX_SUBOFFSET(rx);
392 *p++ = (UV)RX_SUBCOFFSET(rx);
07bc277f
NC
393 for (i = 0; i <= RX_NPARENS(rx); ++i) {
394 *p++ = (UV)RX_OFFS(rx)[i].start;
395 *p++ = (UV)RX_OFFS(rx)[i].end;
c90c0ff4
PP
396 }
397}
398
9c105995
NC
399static void
400S_rxres_restore(pTHX_ void **rsp, REGEXP *rx)
c90c0ff4
PP
401{
402 UV *p = (UV*)*rsp;
403 U32 i;
7918f24d
NC
404
405 PERL_ARGS_ASSERT_RXRES_RESTORE;
96a5add6 406 PERL_UNUSED_CONTEXT;
c90c0ff4 407
ed252734 408 RX_MATCH_COPY_FREE(rx);
cf93c79d 409 RX_MATCH_COPIED_set(rx, *p);
c90c0ff4 410 *p++ = 0;
6c31ff74 411 RX_NPARENS(rx) = *p++;
c90c0ff4 412
db2c6cb3 413#ifdef PERL_ANY_COW
bdd9a1b1
NC
414 if (RX_SAVED_COPY(rx))
415 SvREFCNT_dec (RX_SAVED_COPY(rx));
416 RX_SAVED_COPY(rx) = INT2PTR(SV*,*p);
ed252734
NC
417 *p++ = 0;
418#endif
419
07bc277f
NC
420 RX_SUBBEG(rx) = INT2PTR(char*,*p++);
421 RX_SUBLEN(rx) = (I32)(*p++);
6502e081
DM
422 RX_SUBOFFSET(rx) = (I32)*p++;
423 RX_SUBCOFFSET(rx) = (I32)*p++;
07bc277f
NC
424 for (i = 0; i <= RX_NPARENS(rx); ++i) {
425 RX_OFFS(rx)[i].start = (I32)(*p++);
426 RX_OFFS(rx)[i].end = (I32)(*p++);
c90c0ff4
PP
427 }
428}
429
9c105995
NC
430static void
431S_rxres_free(pTHX_ void **rsp)
c90c0ff4 432{
44f8325f 433 UV * const p = (UV*)*rsp;
7918f24d
NC
434
435 PERL_ARGS_ASSERT_RXRES_FREE;
96a5add6 436 PERL_UNUSED_CONTEXT;
c90c0ff4
PP
437
438 if (p) {
94010e71 439 void *tmp = INT2PTR(char*,*p);
6c31ff74 440#ifdef PERL_POISON
db2c6cb3 441#ifdef PERL_ANY_COW
6c31ff74 442 U32 i = 9 + p[1] * 2;
94010e71 443#else
6c31ff74 444 U32 i = 8 + p[1] * 2;
94010e71 445#endif
6c31ff74
NC
446#endif
447
db2c6cb3 448#ifdef PERL_ANY_COW
6c31ff74 449 SvREFCNT_dec (INT2PTR(SV*,p[2]));
ed252734 450#endif
6c31ff74
NC
451#ifdef PERL_POISON
452 PoisonFree(p, i, sizeof(UV));
453#endif
454
455 Safefree(tmp);
c90c0ff4 456 Safefree(p);
4608196e 457 *rsp = NULL;
c90c0ff4
PP
458 }
459}
460
a701009a
DM
461#define FORM_NUM_BLANK (1<<30)
462#define FORM_NUM_POINT (1<<29)
463
a0d0e21e
LW
464PP(pp_formline)
465{
20b7effb 466 dSP; dMARK; dORIGMARK;
eb578fdb 467 SV * const tmpForm = *++MARK;
086b26f3 468 SV *formsv; /* contains text of original format */
eb578fdb
KW
469 U32 *fpc; /* format ops program counter */
470 char *t; /* current append position in target string */
086b26f3 471 const char *f; /* current position in format string */
eb578fdb
KW
472 I32 arg;
473 SV *sv = NULL; /* current item */
086b26f3 474 const char *item = NULL;/* string value of current item */
9b4bdfd4
DM
475 I32 itemsize = 0; /* length (chars) of item, possibly truncated */
476 I32 itembytes = 0; /* as itemsize, but length in bytes */
086b26f3
DM
477 I32 fieldsize = 0; /* width of current field */
478 I32 lines = 0; /* number of lines that have been output */
479 bool chopspace = (strchr(PL_chopset, ' ') != NULL); /* does $: have space */
480 const char *chophere = NULL; /* where to chop current item */
f5ada144 481 STRLEN linemark = 0; /* pos of start of line in output */
65202027 482 NV value;
086b26f3 483 bool gotsome = FALSE; /* seen at least one non-blank item on this line */
9b4bdfd4 484 STRLEN len; /* length of current sv */
26e935cf 485 STRLEN linemax; /* estimate of output size in bytes */
1bd51a4c
IH
486 bool item_is_utf8 = FALSE;
487 bool targ_is_utf8 = FALSE;
bd7084a6 488 const char *fmt;
74e0ddf7 489 MAGIC *mg = NULL;
4ff700b9
DM
490 U8 *source; /* source of bytes to append */
491 STRLEN to_copy; /* how may bytes to append */
ea60cfe8 492 char trans; /* what chars to translate */
74e0ddf7 493
3808a683 494 mg = doparseform(tmpForm);
a0d0e21e 495
74e0ddf7 496 fpc = (U32*)mg->mg_ptr;
3808a683
DM
497 /* the actual string the format was compiled from.
498 * with overload etc, this may not match tmpForm */
499 formsv = mg->mg_obj;
500
74e0ddf7 501
3280af22 502 SvPV_force(PL_formtarget, len);
3808a683 503 if (SvTAINTED(tmpForm) || SvTAINTED(formsv))
125b9982 504 SvTAINTED_on(PL_formtarget);
1bd51a4c
IH
505 if (DO_UTF8(PL_formtarget))
506 targ_is_utf8 = TRUE;
26e935cf
DM
507 linemax = (SvCUR(formsv) * (IN_BYTES ? 1 : 3) + 1);
508 t = SvGROW(PL_formtarget, len + linemax + 1);
509 /* XXX from now onwards, SvCUR(PL_formtarget) is invalid */
a0d0e21e 510 t += len;
3808a683 511 f = SvPV_const(formsv, len);
a0d0e21e
LW
512
513 for (;;) {
514 DEBUG_f( {
bfed75c6 515 const char *name = "???";
a0d0e21e
LW
516 arg = -1;
517 switch (*fpc) {
518 case FF_LITERAL: arg = fpc[1]; name = "LITERAL"; break;
519 case FF_BLANK: arg = fpc[1]; name = "BLANK"; break;
520 case FF_SKIP: arg = fpc[1]; name = "SKIP"; break;
521 case FF_FETCH: arg = fpc[1]; name = "FETCH"; break;
522 case FF_DECIMAL: arg = fpc[1]; name = "DECIMAL"; break;
523
524 case FF_CHECKNL: name = "CHECKNL"; break;
525 case FF_CHECKCHOP: name = "CHECKCHOP"; break;
526 case FF_SPACE: name = "SPACE"; break;
527 case FF_HALFSPACE: name = "HALFSPACE"; break;
528 case FF_ITEM: name = "ITEM"; break;
529 case FF_CHOP: name = "CHOP"; break;
530 case FF_LINEGLOB: name = "LINEGLOB"; break;
531 case FF_NEWLINE: name = "NEWLINE"; break;
532 case FF_MORE: name = "MORE"; break;
533 case FF_LINEMARK: name = "LINEMARK"; break;
534 case FF_END: name = "END"; break;
bfed75c6 535 case FF_0DECIMAL: name = "0DECIMAL"; break;
a1b95068 536 case FF_LINESNGL: name = "LINESNGL"; break;
a0d0e21e
LW
537 }
538 if (arg >= 0)
bf49b057 539 PerlIO_printf(Perl_debug_log, "%-16s%ld\n", name, (long) arg);
a0d0e21e 540 else
bf49b057 541 PerlIO_printf(Perl_debug_log, "%-16s\n", name);
5f80b19c 542 } );
a0d0e21e 543 switch (*fpc++) {
4a73dc0b 544 case FF_LINEMARK: /* start (or end) of a line */
f5ada144 545 linemark = t - SvPVX(PL_formtarget);
a0d0e21e
LW
546 lines++;
547 gotsome = FALSE;
548 break;
549
4a73dc0b 550 case FF_LITERAL: /* append <arg> literal chars */
ea60cfe8
DM
551 to_copy = *fpc++;
552 source = (U8 *)f;
553 f += to_copy;
554 trans = '~';
75645721 555 item_is_utf8 = targ_is_utf8 ? !!DO_UTF8(formsv) : !!SvUTF8(formsv);
ea60cfe8 556 goto append;
a0d0e21e 557
4a73dc0b 558 case FF_SKIP: /* skip <arg> chars in format */
a0d0e21e
LW
559 f += *fpc++;
560 break;
561
4a73dc0b 562 case FF_FETCH: /* get next item and set field size to <arg> */
a0d0e21e
LW
563 arg = *fpc++;
564 f += arg;
565 fieldsize = arg;
566
567 if (MARK < SP)
568 sv = *++MARK;
569 else {
3280af22 570 sv = &PL_sv_no;
a2a5de95 571 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX), "Not enough format arguments");
a0d0e21e 572 }
125b9982
NT
573 if (SvTAINTED(sv))
574 SvTAINTED_on(PL_formtarget);
a0d0e21e
LW
575 break;
576
4a73dc0b 577 case FF_CHECKNL: /* find max len of item (up to \n) that fits field */
5a34cab7 578 {
5a34cab7 579 const char *s = item = SvPV_const(sv, len);
9b4bdfd4
DM
580 const char *send = s + len;
581
582 itemsize = 0;
583 item_is_utf8 = DO_UTF8(sv);
584 while (s < send) {
585 if (!isCNTRL(*s))
586 gotsome = TRUE;
587 else if (*s == '\n')
588 break;
589
590 if (item_is_utf8)
591 s += UTF8SKIP(s);
592 else
593 s++;
594 itemsize++;
595 if (itemsize == fieldsize)
596 break;
597 }
598 itembytes = s - item;
62db6ea5 599 chophere = s;
5a34cab7 600 break;
a0ed51b3 601 }
a0d0e21e 602
4a73dc0b 603 case FF_CHECKCHOP: /* like CHECKNL, but up to highest split point */
5a34cab7
NC
604 {
605 const char *s = item = SvPV_const(sv, len);
9b4bdfd4
DM
606 const char *send = s + len;
607 I32 size = 0;
608
609 chophere = NULL;
610 item_is_utf8 = DO_UTF8(sv);
611 while (s < send) {
612 /* look for a legal split position */
613 if (isSPACE(*s)) {
614 if (*s == '\r') {
615 chophere = s;
616 itemsize = size;
617 break;
618 }
619 if (chopspace) {
620 /* provisional split point */
621 chophere = s;
622 itemsize = size;
623 }
624 /* we delay testing fieldsize until after we've
625 * processed the possible split char directly
626 * following the last field char; so if fieldsize=3
627 * and item="a b cdef", we consume "a b", not "a".
628 * Ditto further down.
629 */
630 if (size == fieldsize)
631 break;
632 }
633 else {
634 if (strchr(PL_chopset, *s)) {
635 /* provisional split point */
636 /* for a non-space split char, we include
637 * the split char; hence the '+1' */
638 chophere = s + 1;
639 itemsize = size;
640 }
641 if (size == fieldsize)
642 break;
643 if (!isCNTRL(*s))
644 gotsome = TRUE;
645 }
646
647 if (item_is_utf8)
648 s += UTF8SKIP(s);
649 else
077dbbf3 650 s++;
9b4bdfd4
DM
651 size++;
652 }
653 if (!chophere || s == send) {
654 chophere = s;
655 itemsize = size;
656 }
657 itembytes = chophere - item;
658
5a34cab7 659 break;
a0d0e21e 660 }
a0d0e21e 661
4a73dc0b 662 case FF_SPACE: /* append padding space (diff of field, item size) */
a0d0e21e
LW
663 arg = fieldsize - itemsize;
664 if (arg) {
665 fieldsize -= arg;
666 while (arg-- > 0)
667 *t++ = ' ';
668 }
669 break;
670
4a73dc0b 671 case FF_HALFSPACE: /* like FF_SPACE, but only append half as many */
a0d0e21e
LW
672 arg = fieldsize - itemsize;
673 if (arg) {
674 arg /= 2;
675 fieldsize -= arg;
676 while (arg-- > 0)
677 *t++ = ' ';
678 }
679 break;
680
4a73dc0b 681 case FF_ITEM: /* append a text item, while blanking ctrl chars */
9b4bdfd4 682 to_copy = itembytes;
8aa7beb6
DM
683 source = (U8 *)item;
684 trans = 1;
8aa7beb6 685 goto append;
a0d0e21e 686
4a73dc0b 687 case FF_CHOP: /* (for ^*) chop the current item */
fb9282c3 688 if (sv != &PL_sv_no) {
5a34cab7
NC
689 const char *s = chophere;
690 if (chopspace) {
af68e756 691 while (isSPACE(*s))
5a34cab7
NC
692 s++;
693 }
9b4bdfd4
DM
694 if (SvPOKp(sv))
695 sv_chop(sv,s);
696 else
697 /* tied, overloaded or similar strangeness.
698 * Do it the hard way */
699 sv_setpvn(sv, s, len - (s-item));
5a34cab7
NC
700 SvSETMAGIC(sv);
701 break;
a0d0e21e 702 }
a0d0e21e 703
4a73dc0b 704 case FF_LINESNGL: /* process ^* */
a1b95068 705 chopspace = 0;
c67159e1 706 /* FALLTHROUGH */
4a73dc0b
DM
707
708 case FF_LINEGLOB: /* process @* */
5a34cab7 709 {
e32383e2 710 const bool oneline = fpc[-1] == FF_LINESNGL;
5a34cab7 711 const char *s = item = SvPV_const(sv, len);
7440a75b 712 const char *const send = s + len;
7440a75b 713
f3f2f1a3 714 item_is_utf8 = DO_UTF8(sv);
fb9282c3 715 chophere = s + len;
a1137ee5 716 if (!len)
7440a75b 717 break;
ea60cfe8 718 trans = 0;
0d21cefe 719 gotsome = TRUE;
4ff700b9
DM
720 source = (U8 *) s;
721 to_copy = len;
0d21cefe
DM
722 while (s < send) {
723 if (*s++ == '\n') {
724 if (oneline) {
9b4bdfd4 725 to_copy = s - item - 1;
0d21cefe
DM
726 chophere = s;
727 break;
728 } else {
729 if (s == send) {
0d21cefe
DM
730 to_copy--;
731 } else
732 lines++;
1bd51a4c 733 }
a0d0e21e 734 }
0d21cefe 735 }
a2c0032b
DM
736 }
737
ea60cfe8
DM
738 append:
739 /* append to_copy bytes from source to PL_formstring.
740 * item_is_utf8 implies source is utf8.
741 * if trans, translate certain characters during the copy */
a2c0032b
DM
742 {
743 U8 *tmp = NULL;
26e935cf 744 STRLEN grow = 0;
0325ce87
DM
745
746 SvCUR_set(PL_formtarget,
747 t - SvPVX_const(PL_formtarget));
748
0d21cefe
DM
749 if (targ_is_utf8 && !item_is_utf8) {
750 source = tmp = bytes_to_utf8(source, &to_copy);
0d21cefe
DM
751 } else {
752 if (item_is_utf8 && !targ_is_utf8) {
f5ada144 753 U8 *s;
0d21cefe 754 /* Upgrade targ to UTF8, and then we reduce it to
0325ce87
DM
755 a problem we have a simple solution for.
756 Don't need get magic. */
0d21cefe 757 sv_utf8_upgrade_nomg(PL_formtarget);
0325ce87 758 targ_is_utf8 = TRUE;
f5ada144
DM
759 /* re-calculate linemark */
760 s = (U8*)SvPVX(PL_formtarget);
26e935cf
DM
761 /* the bytes we initially allocated to append the
762 * whole line may have been gobbled up during the
763 * upgrade, so allocate a whole new line's worth
764 * for safety */
765 grow = linemax;
f5ada144
DM
766 while (linemark--)
767 s += UTF8SKIP(s);
768 linemark = s - (U8*)SvPVX(PL_formtarget);
e8e72d41 769 }
0d21cefe
DM
770 /* Easy. They agree. */
771 assert (item_is_utf8 == targ_is_utf8);
772 }
26e935cf
DM
773 if (!trans)
774 /* @* and ^* are the only things that can exceed
775 * the linemax, so grow by the output size, plus
776 * a whole new form's worth in case of any further
777 * output */
778 grow = linemax + to_copy;
779 if (grow)
780 SvGROW(PL_formtarget, SvCUR(PL_formtarget) + grow + 1);
0d21cefe
DM
781 t = SvPVX(PL_formtarget) + SvCUR(PL_formtarget);
782
783 Copy(source, t, to_copy, char);
ea60cfe8 784 if (trans) {
8aa7beb6
DM
785 /* blank out ~ or control chars, depending on trans.
786 * works on bytes not chars, so relies on not
787 * matching utf8 continuation bytes */
ea60cfe8
DM
788 U8 *s = (U8*)t;
789 U8 *send = s + to_copy;
790 while (s < send) {
8aa7beb6 791 const int ch = *s;
077dbbf3 792 if (trans == '~' ? (ch == '~') : isCNTRL(ch))
ea60cfe8
DM
793 *s = ' ';
794 s++;
795 }
796 }
797
0d21cefe
DM
798 t += to_copy;
799 SvCUR_set(PL_formtarget, SvCUR(PL_formtarget) + to_copy);
a1137ee5 800 if (tmp)
0d21cefe 801 Safefree(tmp);
5a34cab7 802 break;
a0d0e21e 803 }
a0d0e21e 804
4a73dc0b 805 case FF_0DECIMAL: /* like FF_DECIMAL but for 0### */
a0d0e21e 806 arg = *fpc++;
bd7084a6 807 fmt = (const char *)
a029fa42 808 ((arg & FORM_NUM_POINT) ? "%#0*.*" NVff : "%0*.*" NVff);
bd7084a6 809 goto ff_dec;
5d37acd6 810
bd7084a6
DM
811 case FF_DECIMAL: /* do @##, ^##, where <arg>=(precision|flags) */
812 arg = *fpc++;
bd7084a6 813 fmt = (const char *)
a029fa42 814 ((arg & FORM_NUM_POINT) ? "%#*.*" NVff : "%*.*" NVff);
bd7084a6 815 ff_dec:
784707d5
JP
816 /* If the field is marked with ^ and the value is undefined,
817 blank it out. */
a701009a 818 if ((arg & FORM_NUM_BLANK) && !SvOK(sv)) {
784707d5
JP
819 arg = fieldsize;
820 while (arg--)
821 *t++ = ' ';
822 break;
823 }
824 gotsome = TRUE;
825 value = SvNV(sv);
a1b95068 826 /* overflow evidence */
bfed75c6 827 if (num_overflow(value, fieldsize, arg)) {
a1b95068
LW
828 arg = fieldsize;
829 while (arg--)
830 *t++ = '#';
831 break;
832 }
784707d5
JP
833 /* Formats aren't yet marked for locales, so assume "yes". */
834 {
e8549682
JH
835 Size_t max = SvLEN(PL_formtarget) - (t - SvPVX(PL_formtarget));
836 int len;
67d796ae
KW
837 DECLARATION_FOR_LC_NUMERIC_MANIPULATION;
838 STORE_LC_NUMERIC_SET_TO_NEEDED();
51f14a05 839 arg &= ~(FORM_NUM_POINT|FORM_NUM_BLANK);
a4eca1d4
JH
840#ifdef USE_QUADMATH
841 {
842 const char* qfmt = quadmath_format_single(fmt);
843 int len;
844 if (!qfmt)
845 Perl_croak_nocontext("panic: quadmath invalid format \"%s\"", fmt);
846 len = quadmath_snprintf(t, max, qfmt, (int) fieldsize, (int) arg, value);
847 if (len == -1)
848 Perl_croak_nocontext("panic: quadmath_snprintf failed, format \"%s\"", qfmt);
849 if (qfmt != fmt)
850 Safefree(fmt);
851 }
852#else
b587c0e8
DM
853 /* we generate fmt ourselves so it is safe */
854 GCC_DIAG_IGNORE(-Wformat-nonliteral);
e8549682 855 len = my_snprintf(t, max, fmt, (int) fieldsize, (int) arg, value);
b587c0e8 856 GCC_DIAG_RESTORE;
a4eca1d4
JH
857#endif
858 PERL_MY_SNPRINTF_POST_GUARD(len, max);
a2287a13 859 RESTORE_LC_NUMERIC();
784707d5
JP
860 }
861 t += fieldsize;
862 break;
a1b95068 863
4a73dc0b 864 case FF_NEWLINE: /* delete trailing spaces, then append \n */
a0d0e21e 865 f++;
f5ada144 866 while (t-- > (SvPVX(PL_formtarget) + linemark) && *t == ' ') ;
a0d0e21e
LW
867 t++;
868 *t++ = '\n';
869 break;
870
4a73dc0b 871 case FF_BLANK: /* for arg==0: do '~'; for arg>0 : do '~~' */
a0d0e21e
LW
872 arg = *fpc++;
873 if (gotsome) {
874 if (arg) { /* repeat until fields exhausted? */
11f9eeaf
DM
875 fpc--;
876 goto end;
a0d0e21e
LW
877 }
878 }
879 else {
f5ada144 880 t = SvPVX(PL_formtarget) + linemark;
a0d0e21e
LW
881 lines--;
882 }
883 break;
884
4a73dc0b 885 case FF_MORE: /* replace long end of string with '...' */
5a34cab7
NC
886 {
887 const char *s = chophere;
888 const char *send = item + len;
889 if (chopspace) {
af68e756 890 while (isSPACE(*s) && (s < send))
5a34cab7 891 s++;
a0d0e21e 892 }
5a34cab7
NC
893 if (s < send) {
894 char *s1;
895 arg = fieldsize - itemsize;
896 if (arg) {
897 fieldsize -= arg;
898 while (arg-- > 0)
899 *t++ = ' ';
900 }
901 s1 = t - 3;
902 if (strnEQ(s1," ",3)) {
903 while (s1 > SvPVX_const(PL_formtarget) && isSPACE(s1[-1]))
904 s1--;
905 }
906 *s1++ = '.';
907 *s1++ = '.';
908 *s1++ = '.';
a0d0e21e 909 }
5a34cab7 910 break;
a0d0e21e 911 }
4a73dc0b
DM
912
913 case FF_END: /* tidy up, then return */
11f9eeaf 914 end:
bf2bec63 915 assert(t < SvPVX_const(PL_formtarget) + SvLEN(PL_formtarget));
a0d0e21e 916 *t = '\0';
b15aece3 917 SvCUR_set(PL_formtarget, t - SvPVX_const(PL_formtarget));
1bd51a4c
IH
918 if (targ_is_utf8)
919 SvUTF8_on(PL_formtarget);
3280af22 920 FmLINES(PL_formtarget) += lines;
a0d0e21e 921 SP = ORIGMARK;
11f9eeaf
DM
922 if (fpc[-1] == FF_BLANK)
923 RETURNOP(cLISTOP->op_first);
924 else
925 RETPUSHYES;
a0d0e21e
LW
926 }
927 }
928}
929
930PP(pp_grepstart)
931{
20b7effb 932 dSP;
a0d0e21e
LW
933 SV *src;
934
6cae08a8 935 if (PL_stack_base + TOPMARK == SP) {
a0d0e21e 936 (void)POPMARK;
54310121 937 if (GIMME_V == G_SCALAR)
6e449a3a 938 mXPUSHi(0);
533c011a 939 RETURNOP(PL_op->op_next->op_next);
a0d0e21e 940 }
6cae08a8 941 PL_stack_sp = PL_stack_base + TOPMARK + 1;
897d3989
NC
942 Perl_pp_pushmark(aTHX); /* push dst */
943 Perl_pp_pushmark(aTHX); /* push src */
d343c3ef 944 ENTER_with_name("grep"); /* enter outer scope */
a0d0e21e
LW
945
946 SAVETMPS;
ffd49c98 947 SAVE_DEFSV;
d343c3ef 948 ENTER_with_name("grep_item"); /* enter inner scope */
7766f137 949 SAVEVPTR(PL_curpm);
a0d0e21e 950
6cae08a8 951 src = PL_stack_base[TOPMARK];
60779a30 952 if (SvPADTMP(src)) {
6cae08a8 953 src = PL_stack_base[TOPMARK] = sv_mortalcopy(src);
a0ed822e
FC
954 PL_tmps_floor++;
955 }
a0d0e21e 956 SvTEMP_off(src);
ffd49c98 957 DEFSV_set(src);
a0d0e21e
LW
958
959 PUTBACK;
533c011a 960 if (PL_op->op_type == OP_MAPSTART)
897d3989 961 Perl_pp_pushmark(aTHX); /* push top */
533c011a 962 return ((LOGOP*)PL_op->op_next)->op_other;
a0d0e21e
LW
963}
964
a0d0e21e
LW
965PP(pp_mapwhile)
966{
20b7effb 967 dSP;
f54cb97a 968 const I32 gimme = GIMME_V;
6cae08a8 969 I32 items = (SP - PL_stack_base) - TOPMARK; /* how many new items */
a0d0e21e
LW
970 I32 count;
971 I32 shift;
972 SV** src;
ac27b0f5 973 SV** dst;
a0d0e21e 974
544f3153 975 /* first, move source pointer to the next item in the source list */
3280af22 976 ++PL_markstack_ptr[-1];
544f3153
GS
977
978 /* if there are new items, push them into the destination list */
4c90a460 979 if (items && gimme != G_VOID) {
544f3153
GS
980 /* might need to make room back there first */
981 if (items > PL_markstack_ptr[-1] - PL_markstack_ptr[-2]) {
982 /* XXX this implementation is very pessimal because the stack
983 * is repeatedly extended for every set of items. Is possible
984 * to do this without any stack extension or copying at all
985 * by maintaining a separate list over which the map iterates
18ef8bea 986 * (like foreach does). --gsar */
544f3153
GS
987
988 /* everything in the stack after the destination list moves
989 * towards the end the stack by the amount of room needed */
990 shift = items - (PL_markstack_ptr[-1] - PL_markstack_ptr[-2]);
991
992 /* items to shift up (accounting for the moved source pointer) */
993 count = (SP - PL_stack_base) - (PL_markstack_ptr[-1] - 1);
18ef8bea
BT
994
995 /* This optimization is by Ben Tilly and it does
996 * things differently from what Sarathy (gsar)
997 * is describing. The downside of this optimization is
998 * that leaves "holes" (uninitialized and hopefully unused areas)
999 * to the Perl stack, but on the other hand this
1000 * shouldn't be a problem. If Sarathy's idea gets
1001 * implemented, this optimization should become
1002 * irrelevant. --jhi */
1003 if (shift < count)
1004 shift = count; /* Avoid shifting too often --Ben Tilly */
bfed75c6 1005
924508f0
GS
1006 EXTEND(SP,shift);
1007 src = SP;
1008 dst = (SP += shift);
3280af22
NIS
1009 PL_markstack_ptr[-1] += shift;
1010 *PL_markstack_ptr += shift;
544f3153 1011 while (count--)
a0d0e21e
LW
1012 *dst-- = *src--;
1013 }
544f3153 1014 /* copy the new items down to the destination list */
ac27b0f5 1015 dst = PL_stack_base + (PL_markstack_ptr[-2] += items) - 1;
22023b26 1016 if (gimme == G_ARRAY) {
b2a2a901
DM
1017 /* add returned items to the collection (making mortal copies
1018 * if necessary), then clear the current temps stack frame
1019 * *except* for those items. We do this splicing the items
1020 * into the start of the tmps frame (so some items may be on
59d53fd6 1021 * the tmps stack twice), then moving PL_tmps_floor above
b2a2a901
DM
1022 * them, then freeing the frame. That way, the only tmps that
1023 * accumulate over iterations are the return values for map.
1024 * We have to do to this way so that everything gets correctly
1025 * freed if we die during the map.
1026 */
1027 I32 tmpsbase;
1028 I32 i = items;
1029 /* make space for the slice */
1030 EXTEND_MORTAL(items);
1031 tmpsbase = PL_tmps_floor + 1;
1032 Move(PL_tmps_stack + tmpsbase,
1033 PL_tmps_stack + tmpsbase + items,
1034 PL_tmps_ix - PL_tmps_floor,
1035 SV*);
1036 PL_tmps_ix += items;
1037
1038 while (i-- > 0) {
1039 SV *sv = POPs;
1040 if (!SvTEMP(sv))
1041 sv = sv_mortalcopy(sv);
1042 *dst-- = sv;
1043 PL_tmps_stack[tmpsbase++] = SvREFCNT_inc_simple(sv);
1044 }
1045 /* clear the stack frame except for the items */
1046 PL_tmps_floor += items;
1047 FREETMPS;
1048 /* FREETMPS may have cleared the TEMP flag on some of the items */
1049 i = items;
1050 while (i-- > 0)
1051 SvTEMP_on(PL_tmps_stack[--tmpsbase]);
22023b26 1052 }
bfed75c6 1053 else {
22023b26
TP
1054 /* scalar context: we don't care about which values map returns
1055 * (we use undef here). And so we certainly don't want to do mortal
1056 * copies of meaningless values. */
1057 while (items-- > 0) {
b988aa42 1058 (void)POPs;
22023b26
TP
1059 *dst-- = &PL_sv_undef;
1060 }
b2a2a901 1061 FREETMPS;
22023b26 1062 }
a0d0e21e 1063 }
b2a2a901
DM
1064 else {
1065 FREETMPS;
1066 }
d343c3ef 1067 LEAVE_with_name("grep_item"); /* exit inner scope */
a0d0e21e
LW
1068
1069 /* All done yet? */
6cae08a8 1070 if (PL_markstack_ptr[-1] > TOPMARK) {
a0d0e21e
LW
1071
1072 (void)POPMARK; /* pop top */
d343c3ef 1073 LEAVE_with_name("grep"); /* exit outer scope */
a0d0e21e 1074 (void)POPMARK; /* pop src */
3280af22 1075 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 1076 (void)POPMARK; /* pop dst */
3280af22 1077 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 1078 if (gimme == G_SCALAR) {
7cc47870
RGS
1079 dTARGET;
1080 XPUSHi(items);
a0d0e21e 1081 }
54310121
PP
1082 else if (gimme == G_ARRAY)
1083 SP += items;
a0d0e21e
LW
1084 RETURN;
1085 }
1086 else {
1087 SV *src;
1088
d343c3ef 1089 ENTER_with_name("grep_item"); /* enter inner scope */
7766f137 1090 SAVEVPTR(PL_curpm);
a0d0e21e 1091
544f3153 1092 /* set $_ to the new source item */
3280af22 1093 src = PL_stack_base[PL_markstack_ptr[-1]];
60779a30 1094 if (SvPADTMP(src)) {
60779a30
DM
1095 src = sv_mortalcopy(src);
1096 }
a0d0e21e 1097 SvTEMP_off(src);
ffd49c98 1098 DEFSV_set(src);
a0d0e21e
LW
1099
1100 RETURNOP(cLOGOP->op_other);
1101 }
1102}
1103
a0d0e21e
LW
1104/* Range stuff. */
1105
1106PP(pp_range)
1107{
82334630 1108 if (GIMME_V == G_ARRAY)
1a67a97c 1109 return NORMAL;
538573f7 1110 if (SvTRUEx(PAD_SV(PL_op->op_targ)))
1a67a97c 1111 return cLOGOP->op_other;
538573f7 1112 else
1a67a97c 1113 return NORMAL;
a0d0e21e
LW
1114}
1115
1116PP(pp_flip)
1117{
39644a26 1118 dSP;
a0d0e21e 1119
82334630 1120 if (GIMME_V == G_ARRAY) {
1a67a97c 1121 RETURNOP(((LOGOP*)cUNOP->op_first)->op_other);
a0d0e21e
LW
1122 }
1123 else {
1124 dTOPss;
44f8325f 1125 SV * const targ = PAD_SV(PL_op->op_targ);
bfed75c6 1126 int flip = 0;
790090df 1127
bfed75c6 1128 if (PL_op->op_private & OPpFLIP_LINENUM) {
4e3399f9
YST
1129 if (GvIO(PL_last_in_gv)) {
1130 flip = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
1131 }
1132 else {
fafc274c 1133 GV * const gv = gv_fetchpvs(".", GV_ADD|GV_NOTQUAL, SVt_PV);
44f8325f
AL
1134 if (gv && GvSV(gv))
1135 flip = SvIV(sv) == SvIV(GvSV(gv));
4e3399f9 1136 }
bfed75c6
AL
1137 } else {
1138 flip = SvTRUE(sv);
1139 }
1140 if (flip) {
a0d0e21e 1141 sv_setiv(PAD_SV(cUNOP->op_first->op_targ), 1);
533c011a 1142 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e 1143 sv_setiv(targ, 1);
3e3baf6d 1144 SETs(targ);
a0d0e21e
LW
1145 RETURN;
1146 }
1147 else {
1148 sv_setiv(targ, 0);
924508f0 1149 SP--;
1a67a97c 1150 RETURNOP(((LOGOP*)cUNOP->op_first)->op_other);
a0d0e21e
LW
1151 }
1152 }
76f68e9b 1153 sv_setpvs(TARG, "");
a0d0e21e
LW
1154 SETs(targ);
1155 RETURN;
1156 }
1157}
1158
8e9bbdb9
RGS
1159/* This code tries to decide if "$left .. $right" should use the
1160 magical string increment, or if the range is numeric (we make
1161 an exception for .."0" [#18165]). AMS 20021031. */
1162
1163#define RANGE_IS_NUMERIC(left,right) ( \
b0e74086
RGS
1164 SvNIOKp(left) || (SvOK(left) && !SvPOKp(left)) || \
1165 SvNIOKp(right) || (SvOK(right) && !SvPOKp(right)) || \
e0ab1c0e 1166 (((!SvOK(left) && SvOK(right)) || ((!SvOK(left) || \
b15aece3 1167 looks_like_number(left)) && SvPOKp(left) && *SvPVX_const(left) != '0')) \
e0ab1c0e 1168 && (!SvOK(right) || looks_like_number(right))))
8e9bbdb9 1169
a0d0e21e
LW
1170PP(pp_flop)
1171{
20b7effb 1172 dSP;
a0d0e21e 1173
82334630 1174 if (GIMME_V == G_ARRAY) {
a0d0e21e 1175 dPOPPOPssrl;
86cb7173 1176
5b295bef
RD
1177 SvGETMAGIC(left);
1178 SvGETMAGIC(right);
a0d0e21e 1179
8e9bbdb9 1180 if (RANGE_IS_NUMERIC(left,right)) {
b262c4c9 1181 IV i, j, n;
4d91eccc
FC
1182 if ((SvOK(left) && !SvIOK(left) && SvNV_nomg(left) < IV_MIN) ||
1183 (SvOK(right) && (SvIOK(right)
1184 ? SvIsUV(right) && SvUV(right) > IV_MAX
1185 : SvNV_nomg(right) > IV_MAX)))
d470f89e 1186 DIE(aTHX_ "Range iterator outside integer range");
f52e41ad 1187 i = SvIV_nomg(left);
b262c4c9
JH
1188 j = SvIV_nomg(right);
1189 if (j >= i) {
1190 /* Dance carefully around signed max. */
1191 bool overflow = (i <= 0 && j > SSize_t_MAX + i - 1);
1192 if (!overflow) {
1193 n = j - i + 1;
1194 /* The wraparound of signed integers is undefined
1195 * behavior, but here we aim for count >=1, and
1196 * negative count is just wrong. */
a1e27170
TC
1197 if (n < 1
1198#if IVSIZE > Size_t_size
1199 || n > SSize_t_MAX
1200#endif
1201 )
b262c4c9
JH
1202 overflow = TRUE;
1203 }
1204 if (overflow)
1205 Perl_croak(aTHX_ "Out of memory during list extend");
1206 EXTEND_MORTAL(n);
1207 EXTEND(SP, n);
bbce6d69 1208 }
c1ab3db2 1209 else
b262c4c9
JH
1210 n = 0;
1211 while (n--) {
fc01cab4 1212 SV * const sv = sv_2mortal(newSViv(i));
a0d0e21e 1213 PUSHs(sv);
fc01cab4
DM
1214 if (n) /* avoid incrementing above IV_MAX */
1215 i++;
a0d0e21e
LW
1216 }
1217 }
1218 else {
3c323193
FC
1219 STRLEN len, llen;
1220 const char * const lpv = SvPV_nomg_const(left, llen);
f52e41ad 1221 const char * const tmps = SvPV_nomg_const(right, len);
a0d0e21e 1222
3c323193 1223 SV *sv = newSVpvn_flags(lpv, llen, SvUTF8(left)|SVs_TEMP);
89ea2908 1224 while (!SvNIOKp(sv) && SvCUR(sv) <= len) {
a0d0e21e 1225 XPUSHs(sv);
b15aece3 1226 if (strEQ(SvPVX_const(sv),tmps))
89ea2908 1227 break;
a0d0e21e
LW
1228 sv = sv_2mortal(newSVsv(sv));
1229 sv_inc(sv);
1230 }
a0d0e21e
LW
1231 }
1232 }
1233 else {
1234 dTOPss;
901017d6 1235 SV * const targ = PAD_SV(cUNOP->op_first->op_targ);
4e3399f9 1236 int flop = 0;
a0d0e21e 1237 sv_inc(targ);
4e3399f9
YST
1238
1239 if (PL_op->op_private & OPpFLIP_LINENUM) {
1240 if (GvIO(PL_last_in_gv)) {
1241 flop = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
1242 }
1243 else {
fafc274c 1244 GV * const gv = gv_fetchpvs(".", GV_ADD|GV_NOTQUAL, SVt_PV);
4e3399f9
YST
1245 if (gv && GvSV(gv)) flop = SvIV(sv) == SvIV(GvSV(gv));
1246 }
1247 }
1248 else {
1249 flop = SvTRUE(sv);
1250 }
1251
1252 if (flop) {
a0d0e21e 1253 sv_setiv(PAD_SV(((UNOP*)cUNOP->op_first)->op_first->op_targ), 0);
396482e1 1254 sv_catpvs(targ, "E0");
a0d0e21e
LW
1255 }
1256 SETs(targ);
1257 }
1258
1259 RETURN;
1260}
1261
1262/* Control. */
1263
27da23d5 1264static const char * const context_name[] = {
515afda2 1265 "pseudo-block",
f31522f3 1266 NULL, /* CXt_WHEN never actually needs "block" */
76753e7f 1267 NULL, /* CXt_BLOCK never actually needs "block" */
f31522f3 1268 NULL, /* CXt_GIVEN never actually needs "block" */
76753e7f
NC
1269 NULL, /* CXt_LOOP_FOR never actually needs "loop" */
1270 NULL, /* CXt_LOOP_PLAIN never actually needs "loop" */
1271 NULL, /* CXt_LOOP_LAZYSV never actually needs "loop" */
1272 NULL, /* CXt_LOOP_LAZYIV never actually needs "loop" */
515afda2 1273 "subroutine",
76753e7f 1274 "format",
515afda2 1275 "eval",
515afda2 1276 "substitution",
515afda2
NC
1277};
1278
76e3520e 1279STATIC I32
5db1eb8d 1280S_dopoptolabel(pTHX_ const char *label, STRLEN len, U32 flags)
a0d0e21e 1281{
eb578fdb 1282 I32 i;
a0d0e21e 1283
7918f24d
NC
1284 PERL_ARGS_ASSERT_DOPOPTOLABEL;
1285
a0d0e21e 1286 for (i = cxstack_ix; i >= 0; i--) {
eb578fdb 1287 const PERL_CONTEXT * const cx = &cxstack[i];
6b35e009 1288 switch (CxTYPE(cx)) {
a0d0e21e 1289 case CXt_SUBST:
a0d0e21e 1290 case CXt_SUB:
7766f137 1291 case CXt_FORMAT:
a0d0e21e 1292 case CXt_EVAL:
0a753a76 1293 case CXt_NULL:
dcbac5bb 1294 /* diag_listed_as: Exiting subroutine via %s */
a2a5de95
NC
1295 Perl_ck_warner(aTHX_ packWARN(WARN_EXITING), "Exiting %s via %s",
1296 context_name[CxTYPE(cx)], OP_NAME(PL_op));
79646418 1297 if (CxTYPE(cx) == CXt_NULL) /* sort BLOCK */
515afda2
NC
1298 return -1;
1299 break;
c6fdafd0 1300 case CXt_LOOP_LAZYIV:
d01136d6 1301 case CXt_LOOP_LAZYSV:
3b719c58
NC
1302 case CXt_LOOP_FOR:
1303 case CXt_LOOP_PLAIN:
7e8f1eac 1304 {
5db1eb8d
BF
1305 STRLEN cx_label_len = 0;
1306 U32 cx_label_flags = 0;
1307 const char *cx_label = CxLABEL_len_flags(cx, &cx_label_len, &cx_label_flags);
1308 if (!cx_label || !(
1309 ( (cx_label_flags & SVf_UTF8) != (flags & SVf_UTF8) ) ?
1310 (flags & SVf_UTF8)
1311 ? (bytes_cmp_utf8(
1312 (const U8*)cx_label, cx_label_len,
1313 (const U8*)label, len) == 0)
1314 : (bytes_cmp_utf8(
1315 (const U8*)label, len,
1316 (const U8*)cx_label, cx_label_len) == 0)
eade7155
BF
1317 : (len == cx_label_len && ((cx_label == label)
1318 || memEQ(cx_label, label, len))) )) {
1c98cc53 1319 DEBUG_l(Perl_deb(aTHX_ "(poptolabel(): skipping label at cx=%ld %s)\n",
7e8f1eac 1320 (long)i, cx_label));
a0d0e21e
LW
1321 continue;
1322 }
1c98cc53 1323 DEBUG_l( Perl_deb(aTHX_ "(poptolabel(): found label at cx=%ld %s)\n", (long)i, label));
a0d0e21e 1324 return i;
7e8f1eac 1325 }
a0d0e21e
LW
1326 }
1327 }
1328 return i;
1329}
1330
0d863452
RH
1331
1332
e50aee73 1333I32
864dbfa3 1334Perl_dowantarray(pTHX)
e50aee73 1335{
f54cb97a 1336 const I32 gimme = block_gimme();
54310121
PP
1337 return (gimme == G_VOID) ? G_SCALAR : gimme;
1338}
1339
1340I32
864dbfa3 1341Perl_block_gimme(pTHX)
54310121 1342{
06b5626a 1343 const I32 cxix = dopoptosub(cxstack_ix);
a05700a8 1344 U8 gimme;
e50aee73 1345 if (cxix < 0)
46fc3d4c 1346 return G_VOID;
e50aee73 1347
a05700a8
DM
1348 gimme = (cxstack[cxix].blk_gimme & G_WANT);
1349 if (!gimme)
1350 Perl_croak(aTHX_ "panic: bad gimme: %d\n", gimme);
1351 return gimme;
e50aee73
AD
1352}
1353
a05700a8 1354
78f9721b
SM
1355I32
1356Perl_is_lvalue_sub(pTHX)
1357{
06b5626a 1358 const I32 cxix = dopoptosub(cxstack_ix);
78f9721b
SM
1359 assert(cxix >= 0); /* We should only be called from inside subs */
1360
bafb2adc
NC
1361 if (CxLVAL(cxstack + cxix) && CvLVALUE(cxstack[cxix].blk_sub.cv))
1362 return CxLVAL(cxstack + cxix);
78f9721b
SM
1363 else
1364 return 0;
1365}
1366
777d9014
FC
1367/* only used by PUSHSUB */
1368I32
1369Perl_was_lvalue_sub(pTHX)
1370{
777d9014
FC
1371 const I32 cxix = dopoptosub(cxstack_ix-1);
1372 assert(cxix >= 0); /* We should only be called from inside subs */
1373
1374 if (CxLVAL(cxstack + cxix) && CvLVALUE(cxstack[cxix].blk_sub.cv))
1375 return CxLVAL(cxstack + cxix);
1376 else
1377 return 0;
1378}
1379
76e3520e 1380STATIC I32
901017d6 1381S_dopoptosub_at(pTHX_ const PERL_CONTEXT *cxstk, I32 startingblock)
2c375eb9 1382{
a0d0e21e 1383 I32 i;
7918f24d
NC
1384
1385 PERL_ARGS_ASSERT_DOPOPTOSUB_AT;
81611534
JH
1386#ifndef DEBUGGING
1387 PERL_UNUSED_CONTEXT;
1388#endif
7918f24d 1389
a0d0e21e 1390 for (i = startingblock; i >= 0; i--) {
eb578fdb 1391 const PERL_CONTEXT * const cx = &cxstk[i];
6b35e009 1392 switch (CxTYPE(cx)) {
a0d0e21e
LW
1393 default:
1394 continue;
a0d0e21e 1395 case CXt_SUB:
5fbe8311
DM
1396 /* in sub foo { /(?{...})/ }, foo ends up on the CX stack
1397 * twice; the first for the normal foo() call, and the second
1398 * for a faked up re-entry into the sub to execute the
1399 * code block. Hide this faked entry from the world. */
1400 if (cx->cx_type & CXp_SUB_RE_FAKE)
1401 continue;
c67159e1 1402 /* FALLTHROUGH */
5fbe8311 1403 case CXt_EVAL:
7766f137 1404 case CXt_FORMAT:
1c98cc53 1405 DEBUG_l( Perl_deb(aTHX_ "(dopoptosub_at(): found sub at cx=%ld)\n", (long)i));
a0d0e21e
LW
1406 return i;
1407 }
1408 }
1409 return i;
1410}
1411
76e3520e 1412STATIC I32
cea2e8a9 1413S_dopoptoeval(pTHX_ I32 startingblock)
a0d0e21e
LW
1414{
1415 I32 i;
a0d0e21e 1416 for (i = startingblock; i >= 0; i--) {
eb578fdb 1417 const PERL_CONTEXT *cx = &cxstack[i];
6b35e009 1418 switch (CxTYPE(cx)) {
a0d0e21e
LW
1419 default:
1420 continue;
1421 case CXt_EVAL:
1c98cc53 1422 DEBUG_l( Perl_deb(aTHX_ "(dopoptoeval(): found eval at cx=%ld)\n", (long)i));
a0d0e21e
LW
1423 return i;
1424 }
1425 }
1426 return i;
1427}
1428
76e3520e 1429STATIC I32
cea2e8a9 1430S_dopoptoloop(pTHX_ I32 startingblock)
a0d0e21e
LW
1431{
1432 I32 i;
a0d0e21e 1433 for (i = startingblock; i >= 0; i--) {
eb578fdb 1434 const PERL_CONTEXT * const cx = &cxstack[i];
6b35e009 1435 switch (CxTYPE(cx)) {
a0d0e21e 1436 case CXt_SUBST:
a0d0e21e 1437 case CXt_SUB:
7766f137 1438 case CXt_FORMAT:
a0d0e21e 1439 case CXt_EVAL:
0a753a76 1440 case CXt_NULL:
dcbac5bb 1441 /* diag_listed_as: Exiting subroutine via %s */
a2a5de95
NC
1442 Perl_ck_warner(aTHX_ packWARN(WARN_EXITING), "Exiting %s via %s",
1443 context_name[CxTYPE(cx)], OP_NAME(PL_op));
79646418 1444 if ((CxTYPE(cx)) == CXt_NULL) /* sort BLOCK */
515afda2
NC
1445 return -1;
1446 break;
c6fdafd0 1447 case CXt_LOOP_LAZYIV:
d01136d6 1448 case CXt_LOOP_LAZYSV:
3b719c58
NC
1449 case CXt_LOOP_FOR:
1450 case CXt_LOOP_PLAIN:
1c98cc53 1451 DEBUG_l( Perl_deb(aTHX_ "(dopoptoloop(): found loop at cx=%ld)\n", (long)i));
a0d0e21e
LW
1452 return i;
1453 }
1454 }
1455 return i;
1456}
1457
97f2561e
DM
1458/* find the next GIVEN or FOR loop context block */
1459
0d863452 1460STATIC I32
97f2561e 1461S_dopoptogivenfor(pTHX_ I32 startingblock)
0d863452
RH
1462{
1463 I32 i;
1464 for (i = startingblock; i >= 0; i--) {
eb578fdb 1465 const PERL_CONTEXT *cx = &cxstack[i];
0d863452
RH
1466 switch (CxTYPE(cx)) {
1467 default:
1468 continue;
1469 case CXt_GIVEN:
97f2561e 1470 DEBUG_l( Perl_deb(aTHX_ "(dopoptogivenfor(): found given at cx=%ld)\n", (long)i));
0d863452 1471 return i;
3b719c58
NC
1472 case CXt_LOOP_PLAIN:
1473 assert(!CxFOREACHDEF(cx));
1474 break;
c6fdafd0 1475 case CXt_LOOP_LAZYIV:
d01136d6 1476 case CXt_LOOP_LAZYSV:
3b719c58 1477 case CXt_LOOP_FOR:
0d863452 1478 if (CxFOREACHDEF(cx)) {
97f2561e 1479 DEBUG_l( Perl_deb(aTHX_ "(dopoptogivenfor(): found foreach at cx=%ld)\n", (long)i));
0d863452
RH
1480 return i;
1481 }
1482 }
1483 }
1484 return i;
1485}
1486
1487STATIC I32
1488S_dopoptowhen(pTHX_ I32 startingblock)
1489{
1490 I32 i;
1491 for (i = startingblock; i >= 0; i--) {
eb578fdb 1492 const PERL_CONTEXT *cx = &cxstack[i];
0d863452
RH
1493 switch (CxTYPE(cx)) {
1494 default:
1495 continue;
1496 case CXt_WHEN:
1c98cc53 1497 DEBUG_l( Perl_deb(aTHX_ "(dopoptowhen(): found when at cx=%ld)\n", (long)i));
0d863452
RH
1498 return i;
1499 }
1500 }
1501 return i;
1502}
1503
a0d0e21e 1504void
864dbfa3 1505Perl_dounwind(pTHX_ I32 cxix)
a0d0e21e 1506{
f144f1e3
DM
1507 if (!PL_curstackinfo) /* can happen if die during thread cloning */
1508 return;
1509
a0d0e21e 1510 while (cxstack_ix > cxix) {
eb578fdb 1511 PERL_CONTEXT *cx = &cxstack[cxstack_ix];
1c98cc53 1512 DEBUG_CX("UNWIND"); \
a0d0e21e 1513 /* Note: we don't need to restore the base context info till the end. */
76d10131
DM
1514
1515 CX_LEAVE_SCOPE(cx);
1516
6b35e009 1517 switch (CxTYPE(cx)) {
c90c0ff4
PP
1518 case CXt_SUBST:
1519 POPSUBST(cx);
80d88db0 1520 break;
a0d0e21e 1521 case CXt_SUB:
88c90157 1522 POPSUB(cx);
a0d0e21e
LW
1523 break;
1524 case CXt_EVAL:
1525 POPEVAL(cx);
03e489bc 1526 break;
f5319de9 1527 case CXt_BLOCK:
c5369ccc 1528 POPBASICBLK(cx);
a0d0e21e 1529 break;
c6fdafd0 1530 case CXt_LOOP_LAZYIV:
d01136d6 1531 case CXt_LOOP_LAZYSV:
3b719c58
NC
1532 case CXt_LOOP_FOR:
1533 case CXt_LOOP_PLAIN:
a0d0e21e
LW
1534 POPLOOP(cx);
1535 break;
b95eccd3
DM
1536 case CXt_WHEN:
1537 POPWHEN(cx);
1538 break;
1539 case CXt_GIVEN:
1540 POPGIVEN(cx);
1541 break;
0a753a76 1542 case CXt_NULL:
2f450c1b 1543 /* there isn't a POPNULL ! */
a0d0e21e 1544 break;
7766f137
GS
1545 case CXt_FORMAT:
1546 POPFORMAT(cx);
1547 break;
a0d0e21e 1548 }
c90c0ff4 1549 cxstack_ix--;
a0d0e21e
LW
1550 }
1551}
1552
5a844595
GS
1553void
1554Perl_qerror(pTHX_ SV *err)
1555{
7918f24d
NC
1556 PERL_ARGS_ASSERT_QERROR;
1557
6b2fb389
DM
1558 if (PL_in_eval) {
1559 if (PL_in_eval & EVAL_KEEPERR) {
ecad31f0
BF
1560 Perl_ck_warner(aTHX_ packWARN(WARN_MISC), "\t(in cleanup) %"SVf,
1561 SVfARG(err));
6b2fb389
DM
1562 }
1563 else
1564 sv_catsv(ERRSV, err);
1565 }
5a844595
GS
1566 else if (PL_errors)
1567 sv_catsv(PL_errors, err);
1568 else
be2597df 1569 Perl_warn(aTHX_ "%"SVf, SVfARG(err));
13765c85
DM
1570 if (PL_parser)
1571 ++PL_parser->error_count;
5a844595
GS
1572}
1573
d308a779
DM
1574
1575
1576/* pop the cx, undef or delete the %INC entry, then croak.
1577 * require0 indicates that the require didn't return a true value */
1578
1579void
1580S_undo_inc_then_croak(pTHX_ PERL_CONTEXT *cx, SV *err, bool require0)
1581{
1582 const char *fmt;
1583 HV *inc_hv = GvHVn(PL_incgv);
1584 SV *namesv = cx->blk_eval.old_namesv;
1585 I32 klen = SvUTF8(namesv) ? -(I32)SvCUR(namesv) : (I32)SvCUR(namesv);
1586 const char *key = SvPVX_const(namesv);
1587
1588 CX_POP(cx);
1589
1590 if (require0) {
1591 (void)hv_delete(inc_hv, key, klen, G_DISCARD);
1592 fmt = "%"SVf" did not return a true value";
1593 err = namesv;
1594 }
1595 else {
1596 (void)hv_store(inc_hv, key, klen, &PL_sv_undef, 0);
1597 fmt = "%"SVf"Compilation failed in require";
1598 err = err ? err : newSVpvs_flags("Unknown error\n", SVs_TEMP);
1599 }
1600
1601 /* note that unlike pp_entereval, pp_require isn't
1602 * supposed to trap errors. So now that we've popped the
1603 * EVAL that pp_require pushed, and processed the error
1604 * message, rethrow the error */
1605 Perl_croak(aTHX_ fmt, SVfARG(err));
1606}
1607
1608
bb4c52e0 1609void
c5df3096 1610Perl_die_unwind(pTHX_ SV *msv)
a0d0e21e 1611{
c5df3096 1612 SV *exceptsv = sv_mortalcopy(msv);
96d9b9cd 1613 U8 in_eval = PL_in_eval;
c5df3096 1614 PERL_ARGS_ASSERT_DIE_UNWIND;
87582a92 1615
96d9b9cd 1616 if (in_eval) {
a0d0e21e 1617 I32 cxix;
a0d0e21e 1618
22a30693
Z
1619 /*
1620 * Historically, perl used to set ERRSV ($@) early in the die
1621 * process and rely on it not getting clobbered during unwinding.
1622 * That sucked, because it was liable to get clobbered, so the
1623 * setting of ERRSV used to emit the exception from eval{} has
1624 * been moved to much later, after unwinding (see just before
1625 * JMPENV_JUMP below). However, some modules were relying on the
1626 * early setting, by examining $@ during unwinding to use it as
1627 * a flag indicating whether the current unwinding was caused by
1628 * an exception. It was never a reliable flag for that purpose,
1629 * being totally open to false positives even without actual
1630 * clobberage, but was useful enough for production code to
1631 * semantically rely on it.
1632 *
1633 * We'd like to have a proper introspective interface that
1634 * explicitly describes the reason for whatever unwinding
1635 * operations are currently in progress, so that those modules
1636 * work reliably and $@ isn't further overloaded. But we don't
1637 * have one yet. In its absence, as a stopgap measure, ERRSV is
1638 * now *additionally* set here, before unwinding, to serve as the
1639 * (unreliable) flag that it used to.
1640 *
1641 * This behaviour is temporary, and should be removed when a
1642 * proper way to detect exceptional unwinding has been developed.
1643 * As of 2010-12, the authors of modules relying on the hack
1644 * are aware of the issue, because the modules failed on
1645 * perls 5.13.{1..7} which had late setting of $@ without this
1646 * early-setting hack.
1647 */
1648 if (!(in_eval & EVAL_KEEPERR)) {
1649 SvTEMP_off(exceptsv);
1650 sv_setsv(ERRSV, exceptsv);
1651 }
1652
fc941f37
Z
1653 if (in_eval & EVAL_KEEPERR) {
1654 Perl_ck_warner(aTHX_ packWARN(WARN_MISC), "\t(in cleanup) %"SVf,
1655 SVfARG(exceptsv));
1656 }
1657
5a844595
GS
1658 while ((cxix = dopoptoeval(cxstack_ix)) < 0
1659 && PL_curstackinfo->si_prev)
1660 {
bac4b2ad 1661 dounwind(-1);
d3acc0f7 1662 POPSTACK;
bac4b2ad 1663 }
e336de0d 1664
a0d0e21e 1665 if (cxix >= 0) {
eb578fdb 1666 PERL_CONTEXT *cx;
901017d6 1667 SV **newsp;
f7d0774b 1668 I32 gimme;
8f89e5a9
Z
1669 JMPENV *restartjmpenv;
1670 OP *restartop;
a0d0e21e
LW
1671
1672 if (cxix < cxstack_ix)
1673 dounwind(cxix);
1674
f7d0774b
DM
1675 cx = &cxstack[cxstack_ix];
1676 assert(CxTYPE(cx) == CXt_EVAL);
1677 newsp = PL_stack_base + cx->blk_oldsp;
1678 gimme = cx->blk_gimme;
1679
1680 if (gimme == G_SCALAR)
1681 *++newsp = &PL_sv_undef;
1682 PL_stack_sp = newsp;
1683
1684
6b35e009 1685 if (CxTYPE(cx) != CXt_EVAL) {
7d0994e0 1686 STRLEN msglen;
96d9b9cd 1687 const char* message = SvPVx_const(exceptsv, msglen);
10edeb5d 1688 PerlIO_write(Perl_error_log, (const char *)"panic: die ", 11);
bf49b057 1689 PerlIO_write(Perl_error_log, message, msglen);
a0d0e21e
LW
1690 my_exit(1);
1691 }
f7d0774b 1692
2f450c1b 1693 CX_LEAVE_SCOPE(cx);
a0d0e21e 1694 POPEVAL(cx);
dd748f45 1695 POPBLOCK(cx);
d086202c 1696
8f89e5a9
Z
1697 restartjmpenv = cx->blk_eval.cur_top_env;
1698 restartop = cx->blk_eval.retop;
d308a779 1699 if (CxOLD_OP_TYPE(cx) == OP_REQUIRE) {
d308a779
DM
1700 S_undo_inc_then_croak(aTHX_ cx, exceptsv, FALSE);
1701 NOT_REACHED; /* NOTREACHED */
1702 }
5da525e9 1703 CX_POP(cx);
a0d0e21e 1704
fc941f37 1705 if (!(in_eval & EVAL_KEEPERR))
96d9b9cd 1706 sv_setsv(ERRSV, exceptsv);
8f89e5a9
Z
1707 PL_restartjmpenv = restartjmpenv;
1708 PL_restartop = restartop;
bb4c52e0 1709 JMPENV_JUMP(3);
e5964223 1710 NOT_REACHED; /* NOTREACHED */
a0d0e21e
LW
1711 }
1712 }
87582a92 1713
96d9b9cd 1714 write_to_stderr(exceptsv);
f86702cc 1715 my_failure_exit();
e5964223 1716 NOT_REACHED; /* NOTREACHED */
a0d0e21e
LW
1717}
1718
1719PP(pp_xor)
1720{
20b7effb 1721 dSP; dPOPTOPssrl;
a0d0e21e
LW
1722 if (SvTRUE(left) != SvTRUE(right))
1723 RETSETYES;
1724 else
1725 RETSETNO;
1726}
1727
8dff4fc5 1728/*
dcccc8ff
KW
1729
1730=head1 CV Manipulation Functions
1731
8dff4fc5
BM
1732=for apidoc caller_cx
1733
72d33970 1734The XSUB-writer's equivalent of L<caller()|perlfunc/caller>. The
8dff4fc5 1735returned C<PERL_CONTEXT> structure can be interrogated to find all the
72d33970 1736information returned to Perl by C<caller>. Note that XSUBs don't get a
8dff4fc5
BM
1737stack frame, so C<caller_cx(0, NULL)> will return information for the
1738immediately-surrounding Perl code.
1739
1740This function skips over the automatic calls to C<&DB::sub> made on the
72d33970 1741behalf of the debugger. If the stack frame requested was a sub called by
8dff4fc5
BM
1742C<DB::sub>, the return value will be the frame for the call to
1743C<DB::sub>, since that has the correct line number/etc. for the call
72d33970 1744site. If I<dbcxp> is non-C<NULL>, it will be set to a pointer to the
8dff4fc5
BM
1745frame for the sub call itself.
1746
1747=cut
1748*/
1749
1750const PERL_CONTEXT *
1751Perl_caller_cx(pTHX_ I32 count, const PERL_CONTEXT **dbcxp)
a0d0e21e 1752{
eb578fdb
KW
1753 I32 cxix = dopoptosub(cxstack_ix);
1754 const PERL_CONTEXT *cx;
1755 const PERL_CONTEXT *ccstack = cxstack;
901017d6 1756 const PERL_SI *top_si = PL_curstackinfo;
27d41816 1757
a0d0e21e 1758 for (;;) {
2c375eb9
GS
1759 /* we may be in a higher stacklevel, so dig down deeper */
1760 while (cxix < 0 && top_si->si_type != PERLSI_MAIN) {
1761 top_si = top_si->si_prev;
1762 ccstack = top_si->si_cxstack;
1763 cxix = dopoptosub_at(ccstack, top_si->si_cxix);
1764 }
8dff4fc5
BM
1765 if (cxix < 0)
1766 return NULL;
f2a7f298 1767 /* caller() should not report the automatic calls to &DB::sub */
1768 if (PL_DBsub && GvCV(PL_DBsub) && cxix >= 0 &&
3280af22 1769 ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))
a0d0e21e
LW
1770 count++;
1771 if (!count--)
1772 break;
2c375eb9 1773 cxix = dopoptosub_at(ccstack, cxix - 1);
a0d0e21e 1774 }
2c375eb9
GS
1775
1776 cx = &ccstack[cxix];
8dff4fc5
BM
1777 if (dbcxp) *dbcxp = cx;
1778
7766f137 1779 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
f54cb97a 1780 const I32 dbcxix = dopoptosub_at(ccstack, cxix - 1);
2c375eb9 1781 /* We expect that ccstack[dbcxix] is CXt_SUB, anyway, the
06a5b730 1782 field below is defined for any cx. */
f2a7f298 1783 /* caller() should not report the automatic calls to &DB::sub */
1784 if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub))
2c375eb9 1785 cx = &ccstack[dbcxix];
06a5b730
PP
1786 }
1787
8dff4fc5
BM
1788 return cx;
1789}
1790
1791PP(pp_caller)
1792{
8dff4fc5 1793 dSP;
eb578fdb 1794 const PERL_CONTEXT *cx;
8dff4fc5 1795 const PERL_CONTEXT *dbcx;
48ebc325 1796 I32 gimme = GIMME_V;
d527ce7c 1797 const HEK *stash_hek;
8dff4fc5 1798 I32 count = 0;
ce0b554b 1799 bool has_arg = MAXARG && TOPs;
25502127 1800 const COP *lcop;
8dff4fc5 1801
ce0b554b
FC
1802 if (MAXARG) {
1803 if (has_arg)
8dff4fc5 1804 count = POPi;
ce0b554b
FC
1805 else (void)POPs;
1806 }
8dff4fc5 1807
ce0b554b 1808 cx = caller_cx(count + !!(PL_op->op_private & OPpOFFBYONE), &dbcx);
8dff4fc5 1809 if (!cx) {
48ebc325 1810 if (gimme != G_ARRAY) {
8dff4fc5
BM
1811 EXTEND(SP, 1);
1812 RETPUSHUNDEF;
1813 }
1814 RETURN;
1815 }
1816
fb55feef 1817 DEBUG_CX("CALLER");
d0279c7c 1818 assert(CopSTASH(cx->blk_oldcop));
e7886211
FC
1819 stash_hek = SvTYPE(CopSTASH(cx->blk_oldcop)) == SVt_PVHV
1820 ? HvNAME_HEK((HV*)CopSTASH(cx->blk_oldcop))
1821 : NULL;
48ebc325 1822 if (gimme != G_ARRAY) {
27d41816 1823 EXTEND(SP, 1);
d527ce7c 1824 if (!stash_hek)
3280af22 1825 PUSHs(&PL_sv_undef);
49d8d3a1
MB
1826 else {
1827 dTARGET;
d527ce7c 1828 sv_sethek(TARG, stash_hek);
49d8d3a1
MB
1829 PUSHs(TARG);
1830 }
a0d0e21e
LW
1831 RETURN;
1832 }
a0d0e21e 1833
b3ca2e83 1834 EXTEND(SP, 11);
27d41816 1835
d527ce7c 1836 if (!stash_hek)
3280af22 1837 PUSHs(&PL_sv_undef);
d527ce7c
BF
1838 else {
1839 dTARGET;
1840 sv_sethek(TARG, stash_hek);
1841 PUSHTARG;
1842 }
6e449a3a 1843 mPUSHs(newSVpv(OutCopFILE(cx->blk_oldcop), 0));
e6dae479 1844 lcop = closest_cop(cx->blk_oldcop, OpSIBLING(cx->blk_oldcop),
25502127
FC
1845 cx->blk_sub.retop, TRUE);
1846 if (!lcop)
1847 lcop = cx->blk_oldcop;
e9e9e546 1848 mPUSHu(CopLINE(lcop));
ce0b554b 1849 if (!has_arg)
a0d0e21e 1850 RETURN;
7766f137
GS
1851 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
1852 /* So is ccstack[dbcxix]. */
a5f47741 1853 if (CvHASGV(dbcx->blk_sub.cv)) {
ecf05a58 1854 PUSHs(cv_name(dbcx->blk_sub.cv, 0, 0));
bf38a478 1855 PUSHs(boolSV(CxHASARGS(cx)));
07b8c804
RGS
1856 }
1857 else {
84bafc02 1858 PUSHs(newSVpvs_flags("(unknown)", SVs_TEMP));
bf38a478 1859 PUSHs(boolSV(CxHASARGS(cx)));
07b8c804 1860 }
a0d0e21e
LW
1861 }
1862 else {
84bafc02 1863 PUSHs(newSVpvs_flags("(eval)", SVs_TEMP));
6e449a3a 1864 mPUSHi(0);
a0d0e21e 1865 }
54310121
PP
1866 gimme = (I32)cx->blk_gimme;
1867 if (gimme == G_VOID)
3280af22 1868 PUSHs(&PL_sv_undef);
54310121 1869 else
98625aca 1870 PUSHs(boolSV((gimme & G_WANT) == G_ARRAY));
6b35e009 1871 if (CxTYPE(cx) == CXt_EVAL) {
811a4de9 1872 /* eval STRING */
85a64632 1873 if (CxOLD_OP_TYPE(cx) == OP_ENTEREVAL) {
78beb4ca
TC
1874 SV *cur_text = cx->blk_eval.cur_text;
1875 if (SvCUR(cur_text) >= 2) {
1876 PUSHs(newSVpvn_flags(SvPVX(cur_text), SvCUR(cur_text)-2,
1877 SvUTF8(cur_text)|SVs_TEMP));
1878 }
1879 else {
1880 /* I think this is will always be "", but be sure */
1881 PUSHs(sv_2mortal(newSVsv(cur_text)));
1882 }
1883
3280af22 1884 PUSHs(&PL_sv_no);
0f79a09d 1885 }
811a4de9 1886 /* require */
0f79a09d 1887 else if (cx->blk_eval.old_namesv) {
6e449a3a 1888 mPUSHs(newSVsv(cx->blk_eval.old_namesv));
3280af22 1889 PUSHs(&PL_sv_yes);
06a5b730 1890 }
811a4de9
GS
1891 /* eval BLOCK (try blocks have old_namesv == 0) */
1892 else {
1893 PUSHs(&PL_sv_undef);
1894 PUSHs(&PL_sv_undef);
1895 }
4633a7c4 1896 }
a682de96
GS
1897 else {
1898 PUSHs(&PL_sv_undef);
1899 PUSHs(&PL_sv_undef);
1900 }
bafb2adc 1901 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)
ed094faf 1902 && CopSTASH_eq(PL_curcop, PL_debstash))
4633a7c4 1903 {
9513529b
DM
1904 /* slot 0 of the pad contains the original @_ */
1905 AV * const ary = MUTABLE_AV(AvARRAY(MUTABLE_AV(
1906 PadlistARRAY(CvPADLIST(cx->blk_sub.cv))[
1907 cx->blk_sub.olddepth+1]))[0]);
c70927a6 1908 const SSize_t off = AvARRAY(ary) - AvALLOC(ary);
a0d0e21e 1909
e1a80902 1910 Perl_init_dbargs(aTHX);
a0d0e21e 1911
3280af22
NIS
1912 if (AvMAX(PL_dbargs) < AvFILLp(ary) + off)
1913 av_extend(PL_dbargs, AvFILLp(ary) + off);
1914 Copy(AvALLOC(ary), AvARRAY(PL_dbargs), AvFILLp(ary) + 1 + off, SV*);
1915 AvFILLp(PL_dbargs) = AvFILLp(ary) + off;
a0d0e21e 1916 }
6e449a3a 1917 mPUSHi(CopHINTS_get(cx->blk_oldcop));
e476b1b5
GS
1918 {
1919 SV * mask ;
72dc9ed5 1920 STRLEN * const old_warnings = cx->blk_oldcop->cop_warnings ;
114bafba 1921
f07626ad 1922 if (old_warnings == pWARN_NONE)
e476b1b5 1923 mask = newSVpvn(WARN_NONEstring, WARNsize) ;
f07626ad
FC
1924 else if (old_warnings == pWARN_STD && (PL_dowarn & G_WARN_ON) == 0)
1925 mask = &PL_sv_undef ;
ac27b0f5 1926 else if (old_warnings == pWARN_ALL ||
75b6c4ca
RGS
1927 (old_warnings == pWARN_STD && PL_dowarn & G_WARN_ON)) {
1928 /* Get the bit mask for $warnings::Bits{all}, because
1929 * it could have been extended by warnings::register */
1930 SV **bits_all;
6673a63c 1931 HV * const bits = get_hv("warnings::Bits", 0);
017a3ce5 1932 if (bits && (bits_all=hv_fetchs(bits, "all", FALSE))) {
75b6c4ca
RGS
1933 mask = newSVsv(*bits_all);
1934 }
1935 else {
1936 mask = newSVpvn(WARN_ALLstring, WARNsize) ;
1937 }
1938 }
e476b1b5 1939 else
72dc9ed5 1940 mask = newSVpvn((char *) (old_warnings + 1), old_warnings[0]);
6e449a3a 1941 mPUSHs(mask);
e476b1b5 1942 }
b3ca2e83 1943
c28fe1ec 1944 PUSHs(cx->blk_oldcop->cop_hints_hash ?
20439bc7 1945 sv_2mortal(newRV_noinc(MUTABLE_SV(cop_hints_2hv(cx->blk_oldcop, 0))))
b3ca2e83 1946 : &PL_sv_undef);
a0d0e21e
LW
1947 RETURN;
1948}
1949
a0d0e21e
LW
1950PP(pp_reset)
1951{
39644a26 1952 dSP;
ca826051
FC
1953 const char * tmps;
1954 STRLEN len = 0;
1955 if (MAXARG < 1 || (!TOPs && !POPs))
1956 tmps = NULL, len = 0;
1957 else
1958 tmps = SvPVx_const(POPs, len);
1959 sv_resetpvn(tmps, len, CopSTASH(PL_curcop));
3280af22 1960 PUSHs(&PL_sv_yes);
a0d0e21e
LW
1961 RETURN;
1962}
1963
dd2155a4
DM
1964/* like pp_nextstate, but used instead when the debugger is active */
1965
a0d0e21e
LW
1966PP(pp_dbstate)
1967{
533c011a 1968 PL_curcop = (COP*)PL_op;
a0d0e21e 1969 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 1970 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e
LW
1971 FREETMPS;
1972
f410a211
NC
1973 PERL_ASYNC_CHECK();
1974
88df5f01 1975 if (PL_op->op_flags & OPf_SPECIAL /* breakpoint */
a6d69523 1976 || PL_DBsingle_iv || PL_DBsignal_iv || PL_DBtrace_iv)
a0d0e21e 1977 {
39644a26 1978 dSP;
eb578fdb 1979 PERL_CONTEXT *cx;
f54cb97a 1980 const I32 gimme = G_ARRAY;
0bd48802 1981 GV * const gv = PL_DBgv;
432d4561
JL
1982 CV * cv = NULL;
1983
1984 if (gv && isGV_with_GP(gv))
1985 cv = GvCV(gv);
a0d0e21e 1986
c2cb6f77 1987 if (!cv || (!CvROOT(cv) && !CvXSUB(cv)))
cea2e8a9 1988 DIE(aTHX_ "No DB::DB routine defined");
a0d0e21e 1989
aea4f609
DM
1990 if (CvDEPTH(cv) >= 1 && !(PL_debug & DEBUG_DB_RECURSE_FLAG))
1991 /* don't do recursive DB::DB call */
a0d0e21e 1992 return NORMAL;
748a9306 1993
aed2304a 1994 if (CvISXSUB(cv)) {
8ae997c5
DM
1995 ENTER;
1996 SAVEI32(PL_debug);
1997 PL_debug = 0;
1998 SAVESTACK_POS();
8a44b450 1999 SAVETMPS;
c127bd3a
SF
2000 PUSHMARK(SP);
2001 (void)(*CvXSUB(cv))(aTHX_ cv);
c127bd3a 2002 FREETMPS;
a57c6685 2003 LEAVE;
c127bd3a
SF
2004 return NORMAL;
2005 }
2006 else {
8ae997c5 2007 U8 hasargs = 0;
c127bd3a
SF
2008 PUSHBLOCK(cx, CXt_SUB, SP);
2009 PUSHSUB_DB(cx);
2010 cx->blk_sub.retop = PL_op->op_next;
8e7e33ef 2011 cx->cx_old_savestack_ix = PL_savestack_ix;
8ae997c5
DM
2012
2013 SAVEI32(PL_debug);
2014 PL_debug = 0;
2015 SAVESTACK_POS();
c127bd3a 2016 CvDEPTH(cv)++;
9d976ff5
FC
2017 if (CvDEPTH(cv) >= 2) {
2018 PERL_STACK_OVERFLOW_CHECK();
2019 pad_push(CvPADLIST(cv), CvDEPTH(cv));
2020 }
9d976ff5 2021 PAD_SET_CUR_NOSAVE(CvPADLIST(cv), CvDEPTH(cv));
c127bd3a
SF
2022 RETURNOP(CvSTART(cv));
2023 }
a0d0e21e
LW
2024 }
2025 else
2026 return NORMAL;
2027}
2028
2fc507dc 2029/* S_leave_common: Common code that many functions in this file use on
e5ce4d8a 2030 scope exit.
2fc507dc 2031
0663a8f8
DM
2032 Process the return args on the stack in the range (mark+1..PL_stack_sp)
2033 based on context, with any final args starting at newsp+1.
e5ce4d8a 2034 Args are mortal copied (or mortalied if lvalue) unless its safe to use
5b838094
DM
2035 as-is, based on whether it has the specified flags. Note that most
2036 callers specify flags as (SVs_PADTMP|SVs_TEMP), while leaveeval skips
2037 SVs_PADTMP since its optree gets immediately freed, freeing its padtmps
2038 at the same time.
2fc507dc
FC
2039
2040 Also, taintedness is cleared.
2041*/
2ec7f6f2 2042
0663a8f8
DM
2043STATIC void
2044S_leave_common(pTHX_ SV **newsp, SV **mark, I32 gimme,
2ec7f6f2 2045 U32 flags, bool lvalue)
b9d76716 2046{
0663a8f8 2047 dSP;
2fc507dc 2048 PERL_ARGS_ASSERT_LEAVE_COMMON;
b9d76716 2049
80dd201b 2050 TAINT_NOT;
b9d76716
VP
2051 if (gimme == G_SCALAR) {
2052 if (MARK < SP)
e5ce4d8a 2053 *++newsp = (SvFLAGS(*SP) & flags)
2ec7f6f2
FC
2054 ? *SP
2055 : lvalue
2056 ? sv_2mortal(SvREFCNT_inc_simple_NN(*SP))
2057 : sv_mortalcopy(*SP);
b9d76716 2058 else {
0663a8f8
DM
2059 EXTEND(newsp, 1);
2060 *++newsp = &PL_sv_undef;
b9d76716
VP
2061 }
2062 }
2063 else if (gimme == G_ARRAY) {
2064 /* in case LEAVE wipes old return values */
2065 while (++MARK <= SP) {
e5ce4d8a 2066 if (SvFLAGS(*MARK) & flags)
b9d76716
VP
2067 *++newsp = *MARK;
2068 else {
2ec7f6f2
FC
2069 *++newsp = lvalue
2070 ? sv_2mortal(SvREFCNT_inc_simple_NN(*MARK))
2071 : sv_mortalcopy(*MARK);
b9d76716
VP
2072 TAINT_NOT; /* Each item is independent */
2073 }
2074 }
2075 /* When this function was called with MARK == newsp, we reach this
2076 * point with SP == newsp. */
2077 }
2078
0663a8f8 2079 PL_stack_sp = newsp;
b9d76716
VP
2080}
2081
0663a8f8 2082
2b9a6457
VP
2083PP(pp_enter)
2084{
20b7effb 2085 dSP;
eb578fdb 2086 PERL_CONTEXT *cx;
7c2d9d03 2087 I32 gimme = GIMME_V;
2b9a6457 2088
2b9a6457 2089 PUSHBLOCK(cx, CXt_BLOCK, SP);
c5369ccc 2090 PUSHBASICBLK(cx);
2b9a6457
VP
2091
2092 RETURN;
2093}
2094
2095PP(pp_leave)
2096{
eb578fdb 2097 PERL_CONTEXT *cx;
2b9a6457 2098 SV **newsp;
2b9a6457
VP
2099 I32 gimme;
2100
61d3b95a
DM
2101 cx = &cxstack[cxstack_ix];
2102 assert(CxTYPE(cx) == CXt_BLOCK);
4df352a8
DM
2103
2104 if (PL_op->op_flags & OPf_SPECIAL)
2105 cx->blk_oldpm = PL_curpm; /* fake block should preserve $1 et al */
2106
61d3b95a
DM
2107 newsp = PL_stack_base + cx->blk_oldsp;
2108 gimme = cx->blk_gimme;
2b9a6457 2109
0663a8f8
DM
2110 if (gimme == G_VOID)
2111 PL_stack_sp = newsp;
2112 else
2113 leave_common(newsp, newsp, gimme, SVs_PADTMP|SVs_TEMP,
d37a3c64 2114 PL_op->op_private & OPpLVALUE);
67f63db7 2115
2f450c1b 2116 CX_LEAVE_SCOPE(cx);
c5369ccc 2117 POPBASICBLK(cx);
dd748f45 2118 POPBLOCK(cx);
5da525e9 2119 CX_POP(cx);
2b9a6457 2120
0663a8f8 2121 return NORMAL;
2b9a6457
VP
2122}
2123
eaa9f768
JH
2124static bool
2125S_outside_integer(pTHX_ SV *sv)
2126{
2127 if (SvOK(sv)) {
2128 const NV nv = SvNV_nomg(sv);
415b66b2
JH
2129 if (Perl_isinfnan(nv))
2130 return TRUE;
eaa9f768
JH
2131#ifdef NV_PRESERVES_UV
2132 if (nv < (NV)IV_MIN || nv > (NV)IV_MAX)
2133 return TRUE;
2134#else
2135 if (nv <= (NV)IV_MIN)
2136 return TRUE;
2137 if ((nv > 0) &&
2138 ((nv > (NV)UV_MAX ||
2139 SvUV_nomg(sv) > (UV)IV_MAX)))
2140 return TRUE;
2141#endif
2142 }
2143 return FALSE;
2144}
2145
a0d0e21e
LW
2146PP(pp_enteriter)
2147{
20b7effb 2148 dSP; dMARK;
eb578fdb 2149 PERL_CONTEXT *cx;
f54cb97a 2150 const I32 gimme = GIMME_V;
4ad63d70 2151 void *itervarp; /* GV or pad slot of the iteration variable */
f0bb9bf7 2152 SV *itersave; /* the old var in the iterator var slot */
840fe433 2153 U8 cxtype = CXt_LOOP_FOR;
a0d0e21e 2154
aafca525 2155 if (PL_op->op_targ) { /* "my" variable */
4ad63d70
DM
2156 itervarp = &PAD_SVl(PL_op->op_targ);
2157 itersave = *(SV**)itervarp;
2158 assert(itersave);
aafca525 2159 if (PL_op->op_private & OPpLVAL_INTRO) { /* for my $x (...) */
fdb8b82b
DM
2160 /* the SV currently in the pad slot is never live during
2161 * iteration (the slot is always aliased to one of the items)
2162 * so it's always stale */
4ad63d70 2163 SvPADSTALE_on(itersave);
14f338dc 2164 }
4ad63d70 2165 SvREFCNT_inc_simple_void_NN(itersave);
9af0df0b 2166 cxtype |= CXp_FOR_PAD;
54b9620d 2167 }
d39c26a6
FC
2168 else {
2169 SV * const sv = POPs;
4ad63d70 2170 itervarp = (void *)sv;
d4e2b4d6
DM
2171 if (LIKELY(isGV(sv))) { /* symbol table variable */
2172 SV** svp = &GvSV(sv);
2173 itersave = *svp;
2174 if (LIKELY(itersave))
2175 SvREFCNT_inc_simple_void_NN(itersave);
2176 else
2177 *svp = newSV(0);
2178 cxtype |= CXp_FOR_GV;
2179 }
2180 else { /* LV ref: for \$foo (...) */
2181 assert(SvTYPE(sv) == SVt_PVMG);
2182 assert(SvMAGIC(sv));
2183 assert(SvMAGIC(sv)->mg_type == PERL_MAGIC_lvref);
2184 itersave = NULL;
2185 cxtype |= CXp_FOR_LVREF;
2186 }
d39c26a6 2187 }
4633a7c4 2188
0d863452
RH
2189 if (PL_op->op_private & OPpITER_DEF)
2190 cxtype |= CXp_FOR_DEF;
2191
7766f137 2192 PUSHBLOCK(cx, cxtype, SP);
4ad63d70 2193 PUSHLOOP_FOR(cx, itervarp, itersave, MARK);
533c011a 2194 if (PL_op->op_flags & OPf_STACKED) {
d01136d6
BS
2195 SV *maybe_ary = POPs;
2196 if (SvTYPE(maybe_ary) != SVt_PVAV) {
89ea2908 2197 dPOPss;
d01136d6 2198 SV * const right = maybe_ary;
d39c26a6
FC
2199 if (UNLIKELY(cxtype & CXp_FOR_LVREF))
2200 DIE(aTHX_ "Assigned value is not a reference");
984a4bea
RD
2201 SvGETMAGIC(sv);
2202 SvGETMAGIC(right);
4fe3f0fa 2203 if (RANGE_IS_NUMERIC(sv,right)) {
d01136d6 2204 cx->cx_type &= ~CXTYPEMASK;
c6fdafd0
NC
2205 cx->cx_type |= CXt_LOOP_LAZYIV;
2206 /* Make sure that no-one re-orders cop.h and breaks our
2207 assumptions */
2208 assert(CxTYPE(cx) == CXt_LOOP_LAZYIV);
eaa9f768
JH
2209 if (S_outside_integer(aTHX_ sv) ||
2210 S_outside_integer(aTHX_ right))
076d9a11 2211 DIE(aTHX_ "Range iterator outside integer range");
f52e41ad
FC
2212 cx->blk_loop.state_u.lazyiv.cur = SvIV_nomg(sv);
2213 cx->blk_loop.state_u.lazyiv.end = SvIV_nomg(right);
d4665a05
DM
2214#ifdef DEBUGGING
2215 /* for correct -Dstv display */
2216 cx->blk_oldsp = sp - PL_stack_base;
2217#endif
89ea2908 2218 }
3f63a782 2219 else {
d01136d6
BS
2220 cx->cx_type &= ~CXTYPEMASK;
2221 cx->cx_type |= CXt_LOOP_LAZYSV;
2222 /* Make sure that no-one re-orders cop.h and breaks our
2223 assumptions */
2224 assert(CxTYPE(cx) == CXt_LOOP_LAZYSV);
2225 cx->blk_loop.state_u.lazysv.cur = newSVsv(sv);
2226 cx->blk_loop.state_u.lazysv.end = right;
2227 SvREFCNT_inc(right);
2228 (void) SvPV_force_nolen(cx->blk_loop.state_u.lazysv.cur);
267cc4a8
NC
2229 /* This will do the upgrade to SVt_PV, and warn if the value
2230 is uninitialised. */
10516c54 2231 (void) SvPV_nolen_const(right);
267cc4a8
NC
2232 /* Doing this avoids a check every time in pp_iter in pp_hot.c
2233 to replace !SvOK() with a pointer to "". */
2234 if (!SvOK(right)) {
2235 SvREFCNT_dec(right);
d01136d6 2236 cx->blk_loop.state_u.lazysv.end = &PL_sv_no;
267cc4a8 2237 }
3f63a782 2238 }
89ea2908 2239 }
d01136d6 2240 else /* SvTYPE(maybe_ary) == SVt_PVAV */ {
502c6561 2241 cx->blk_loop.state_u.ary.ary = MUTABLE_AV(maybe_ary);
d01136d6
BS
2242 SvREFCNT_inc(maybe_ary);
2243 cx->blk_loop.state_u.ary.ix =
2244 (PL_op->op_private & OPpITER_REVERSED) ?
2245 AvFILL(cx->blk_loop.state_u.ary.ary) + 1 :
2246 -1;
ef3e5ea9 2247 }
89ea2908 2248 }
d01136d6
BS
2249 else { /* iterating over items on the stack */
2250 cx->blk_loop.state_u.ary.ary = NULL; /* means to use the stack */
ef3e5ea9 2251 if (PL_op->op_private & OPpITER_REVERSED) {
d01136d6 2252 cx->blk_loop.state_u.ary.ix = cx->blk_oldsp + 1;
ef3e5ea9
NC
2253 }
2254 else {
d01136d6 2255 cx->blk_loop.state_u.ary.ix = MARK - PL_stack_base;
ef3e5ea9 2256 }
4633a7c4 2257 }
a0d0e21e
LW
2258
2259 RETURN;
2260}
2261
2262PP(pp_enterloop)
2263{
20b7effb 2264 dSP;
eb578fdb 2265 PERL_CONTEXT *cx;
f54cb97a 2266 const I32 gimme = GIMME_V;
a0d0e21e 2267
3b719c58
NC
2268 PUSHBLOCK(cx, CXt_LOOP_PLAIN, SP);
2269 PUSHLOOP_PLAIN(cx, SP);
a0d0e21e
LW
2270
2271 RETURN;
2272}
2273
2274PP(pp_leaveloop)
2275{
eb578fdb 2276 PERL_CONTEXT *cx;
a0d0e21e
LW
2277 I32 gimme;
2278 SV **newsp;
a0d0e21e
LW
2279 SV **mark;
2280
61d3b95a 2281 cx = &cxstack[cxstack_ix];
3b719c58 2282 assert(CxTYPE_is_LOOP(cx));
61d3b95a 2283 mark = PL_stack_base + cx->blk_oldsp;
a8bba7fa 2284 newsp = PL_stack_base + cx->blk_loop.resetsp;
61d3b95a 2285 gimme = cx->blk_gimme;
f86702cc 2286
0663a8f8
DM
2287 if (gimme == G_VOID)
2288 PL_stack_sp = newsp;
2289 else
2290 leave_common(newsp, MARK, gimme, SVs_PADTMP|SVs_TEMP,
a373464f 2291 PL_op->op_private & OPpLVALUE);
f86702cc 2292
2f450c1b 2293 CX_LEAVE_SCOPE(cx);
a8bba7fa 2294 POPLOOP(cx); /* Stack values are safe: release loop vars ... */
dd748f45 2295 POPBLOCK(cx);
5da525e9 2296 CX_POP(cx);
f86702cc 2297
f86702cc 2298 return NORMAL;
a0d0e21e
LW
2299}
2300
31ccb4f5
DM
2301
2302/* This duplicates most of pp_leavesub, but with additional code to handle
2303 * return args in lvalue context. It was forked from pp_leavesub to
2304 * avoid slowing down that function any further.
2305 *
2306 * Any changes made to this function may need to be copied to pp_leavesub
2307 * and vice-versa.
57486a97
DM
2308 */
2309
31ccb4f5 2310PP(pp_leavesublv)
3bdf583b 2311{
57486a97
DM
2312 dSP;
2313 SV **newsp;
2314 SV **mark;
57486a97
DM
2315 I32 gimme;
2316 PERL_CONTEXT *cx;
57486a97 2317 bool ref;
a8fc6464 2318 const char *what = NULL;
5da525e9 2319 OP *retop;
57486a97 2320
61d3b95a
DM
2321 cx = &cxstack[cxstack_ix];
2322 assert(CxTYPE(cx) == CXt_SUB);
2323
2324 if (CxMULTICALL(cx)) {
1f0ba93b
DM
2325 /* entry zero of a stack is always PL_sv_undef, which
2326 * simplifies converting a '()' return into undef in scalar context */
2327 assert(PL_stack_sp > PL_stack_base || *PL_stack_base == &PL_sv_undef);
85ecf147 2328 return 0;
1f0ba93b 2329 }
85ecf147 2330
61d3b95a
DM
2331 newsp = PL_stack_base + cx->blk_oldsp;
2332 gimme = cx->blk_gimme;
57486a97
DM
2333 TAINT_NOT;
2334
e80c4acf 2335 mark = newsp + 1;
57486a97
DM
2336
2337 ref = !!(CxLVAL(cx) & OPpENTERSUB_INARGS);
3bdf583b 2338 if (gimme == G_SCALAR) {
d25b0d7b 2339 if (CxLVAL(cx) && !ref) { /* Leave it as it is if we can. */
e80c4acf 2340 if (MARK <= SP) {
3885a45a 2341 if ((SvPADTMP(TOPs) || SvREADONLY(TOPs)) &&
d25b0d7b 2342 !SvSMAGICAL(TOPs)) {
001de122 2343 what =
d25b0d7b 2344 SvREADONLY(TOPs) ? (TOPs == &PL_sv_undef) ? "undef"
001de122 2345 : "a readonly value" : "a temporary";
d25b0d7b 2346 }
001de122 2347 else goto copy_sv;
d25b0d7b
FC
2348 }
2349 else {
2350 /* sub:lvalue{} will take us here. */
001de122 2351 what = "undef";
d25b0d7b 2352 }
a8fc6464 2353 croak:
001de122
FC
2354 Perl_croak(aTHX_
2355 "Can't return %s from lvalue subroutine", what
2356 );
d25b0d7b 2357 }
e80c4acf 2358 if (MARK <= SP) {
a5ad7a5a 2359 copy_sv:
3bdf583b 2360 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
5811c07e 2361 if (!SvPADTMP(*SP)) {
e80c4acf 2362 *MARK = SvREFCNT_inc(*SP);
3bdf583b 2363 FREETMPS;
e80c4acf 2364 sv_2mortal(*MARK);
5811c07e
FC
2365 }
2366 else {
2367 /* FREETMPS could clobber it */
2368 SV *sv = SvREFCNT_inc(*SP);
2369 FREETMPS;
e80c4acf 2370 *MARK = sv_mortalcopy(sv);
5811c07e
FC
2371 SvREFCNT_dec(sv);
2372 }
3bdf583b
FC
2373 }
2374 else
e80c4acf 2375 *MARK =
5811c07e
FC
2376 SvPADTMP(*SP)
2377 ? sv_mortalcopy(*SP)
2378 : !SvTEMP(*SP)
e08be60b
FC
2379 ? sv_2mortal(SvREFCNT_inc_simple_NN(*SP))
2380 : *SP;
3bdf583b 2381 }
0d235c77 2382 else {
e80c4acf
DM
2383 MEXTEND(MARK, 0);
2384 *MARK = &PL_sv_undef;
0d235c77 2385 }
e80c4acf
DM
2386 SP = MARK;
2387
0e9700df 2388 if (CxLVAL(cx) & OPpDEREF) {
767eda44
FC
2389 SvGETMAGIC(TOPs);
2390 if (!SvOK(TOPs)) {
0e9700df 2391 TOPs = vivify_ref(TOPs, CxLVAL(cx) & OPpDEREF);
767eda44
FC
2392 }
2393 }
3bdf583b
FC
2394 }
2395 else if (gimme == G_ARRAY) {
0e9700df 2396 assert (!(CxLVAL(cx) & OPpDEREF));
80422e24 2397 if (ref || !CxLVAL(cx))
e80c4acf
DM
2398 for (; MARK <= SP; MARK++)
2399 *MARK =
5811c07e 2400 SvFLAGS(*MARK) & SVs_PADTMP
80422e24 2401 ? sv_mortalcopy(*MARK)
5811c07e
FC
2402 : SvTEMP(*MARK)
2403 ? *MARK
80422e24 2404 : sv_2mortal(SvREFCNT_inc_simple_NN(*MARK));
e80c4acf 2405 else for (; MARK <= SP; MARK++) {
d25b0d7b 2406 if (*MARK != &PL_sv_undef
3885a45a 2407 && (SvPADTMP(*MARK) || SvREADONLY(*MARK))
d25b0d7b 2408 ) {
d25b0d7b 2409 /* Might be flattened array after $#array = */
a8fc6464
DM
2410 what = SvREADONLY(*MARK)
2411 ? "a readonly value" : "a temporary";
2412 goto croak;
d25b0d7b 2413 }
e80c4acf
DM
2414 else if (!SvTEMP(*MARK))
2415 *MARK = sv_2mortal(SvREFCNT_inc_simple_NN(*MARK));
3bdf583b
FC
2416 }
2417 }
e80c4acf 2418 PUTBACK;
57486a97 2419
2f450c1b 2420 CX_LEAVE_SCOPE(cx);
88c90157 2421 POPSUB(cx); /* Stack values are safe: release CV and @_ ... */
dd748f45 2422 POPBLOCK(cx);
5da525e9
DM
2423 retop = cx->blk_sub.retop;
2424 CX_POP(cx);
57486a97 2425
5da525e9 2426 return retop;
3bdf583b
FC
2427}
2428
57486a97 2429
a0d0e21e
LW
2430PP(pp_return)
2431{
20b7effb 2432 dSP; dMARK;
eb578fdb 2433 PERL_CONTEXT *cx;
0bd48802
AL
2434 const I32 cxix = dopoptosub(cxstack_ix);
2435
d40dc6b1
DM
2436 assert(cxstack_ix >= 0);
2437 if (cxix < cxstack_ix) {
2438 if (cxix < 0) {
79646418
DM
2439 if (!( PL_curstackinfo->si_type == PERLSI_SORT
2440 || ( PL_curstackinfo->si_type == PERLSI_MULTICALL
2441 && (cxstack[0].cx_type & CXp_SUB_RE_FAKE))
2442 )
2443 )
3089a108 2444 DIE(aTHX_ "Can't return outside a subroutine");
79646418
DM
2445 /* We must be in:
2446 * a sort block, which is a CXt_NULL not a CXt_SUB;
2447 * or a /(?{...})/ block.
2448 * Handle specially. */
2449 assert(CxTYPE(&cxstack[0]) == CXt_NULL
2450 || ( CxTYPE(&cxstack[0]) == CXt_SUB
2451 && (cxstack[0].cx_type & CXp_SUB_RE_FAKE)));
3089a108
DM
2452 if (cxstack_ix > 0) {
2453 /* See comment below about context popping. Since we know
2454 * we're scalar and not lvalue, we can preserve the return
2455 * value in a simpler fashion than there. */
2456 SV *sv = *SP;
d40dc6b1 2457 assert(cxstack[0].blk_gimme == G_SCALAR);
3089a108
DM
2458 if ( (sp != PL_stack_base)
2459 && !(SvFLAGS(sv) & (SVs_TEMP|SVs_PADTMP))
2460 )
2461 *SP = sv_mortalcopy(sv);
2462 dounwind(0);
d40dc6b1 2463 }
3089a108
DM
2464 /* caller responsible for popping cxstack[0] */
2465 return 0;
d40dc6b1 2466 }
3089a108
DM
2467
2468 /* There are contexts that need popping. Doing this may free the
2469 * return value(s), so preserve them first, e.g. popping the plain
2470 * loop here would free $x:
2471 * sub f { { my $x = 1; return $x } }
2472 * We may also need to shift the args down; for example,
2473 * for (1,2) { return 3,4 }
2474 * leaves 1,2,3,4 on the stack. Both these actions can be done by
2475 * leave_common(). By calling it with lvalue=TRUE, we just bump
2476 * the ref count and mortalise the args that need it. The "scan
2477 * the args and maybe copy them" process will be repeated by
2478 * whoever we tail-call (e.g. pp_leaveeval), where any copying etc
2479 * will be done. That is to say, in this code path two scans of
2480 * the args will be done; the first just shifts and preserves; the
2481 * second is the "real" arg processing, based on the type of
2482 * return.
2483 */
2484 cx = &cxstack[cxix];
3089a108 2485 PUTBACK;
0663a8f8
DM
2486 leave_common(PL_stack_base + cx->blk_oldsp, MARK,
2487 cx->blk_gimme, SVs_TEMP|SVs_PADTMP, TRUE);
2488 SPAGAIN;
a0d0e21e 2489 dounwind(cxix);
d40dc6b1 2490 }
3089a108
DM
2491 else {
2492 /* Like in the branch above, we need to handle any extra junk on
2493 * the stack. But because we're not also popping extra contexts, we
2494 * don't have to worry about prematurely freeing args. So we just
2495 * need to do the bare minimum to handle junk, and leave the main
2496 * arg processing in the function we tail call, e.g. pp_leavesub.
2497 * In list context we have to splice out the junk; in scalar
2498 * context we can leave as-is (pp_leavesub will later return the
2499 * top stack element). But for an empty arg list, e.g.
2500 * for (1,2) { return }
2501 * we need to set sp = oldsp so that pp_leavesub knows to push
2502 * &PL_sv_undef onto the stack.
2503 */
3ebe7c5a
DM
2504 SV **oldsp;
2505 cx = &cxstack[cxix];
2506 oldsp = PL_stack_base + cx->blk_oldsp;
2507 if (oldsp != MARK) {
2508 SSize_t nargs = SP - MARK;
2509 if (nargs) {
2510 if (cx->blk_gimme == G_ARRAY) {
2511 /* shift return args to base of call stack frame */
2512 Move(MARK + 1, oldsp + 1, nargs, SV*);
2513 PL_stack_sp = oldsp + nargs;
2514 }
6228a1e1 2515 }
3ebe7c5a
DM
2516 else
2517 PL_stack_sp = oldsp;
13929c4c 2518 }
3089a108 2519 }
617a4f41
DM
2520
2521 /* fall through to a normal exit */
2522 switch (CxTYPE(cx)) {
2523 case CXt_EVAL:
2524 return CxTRYBLOCK(cx)
2525 ? Perl_pp_leavetry(aTHX)
2526 : Perl_pp_leaveeval(aTHX);
2527 case CXt_SUB:
13929c4c 2528 return CvLVALUE(cx->blk_sub.cv)
31ccb4f5 2529 ? Perl_pp_leavesublv(aTHX)
13929c4c 2530 : Perl_pp_leavesub(aTHX);
7766f137 2531 case CXt_FORMAT:
617a4f41 2532 return Perl_pp_leavewrite(aTHX);
a0d0e21e 2533 default:
5637ef5b 2534 DIE(aTHX_ "panic: return, type=%u", (unsigned) CxTYPE(cx));
a0d0e21e 2535 }
a0d0e21e
LW
2536}
2537
4f443c3d 2538
1f039d60
FC
2539static I32
2540S_unwind_loop(pTHX_ const char * const opname)
a0d0e21e 2541{
a0d0e21e 2542 I32 cxix;
1f039d60
FC
2543 if (PL_op->op_flags & OPf_SPECIAL) {
2544 cxix = dopoptoloop(cxstack_ix);
2545 if (cxix < 0)
2546 /* diag_listed_as: Can't "last" outside a loop block */
2547 Perl_croak(aTHX_ "Can't \"%s\" outside a loop block", opname);
2548 }
2549 else {
2550 dSP;
2551 STRLEN label_len;
2552 const char * const label =
2553 PL_op->op_flags & OPf_STACKED
2554 ? SvPV(TOPs,label_len)
2555 : (label_len = strlen(cPVOP->op_pv), cPVOP->op_pv);
2556 const U32 label_flags =
2557 PL_op->op_flags & OPf_STACKED
2558 ? SvUTF8(POPs)
2559 : (cPVOP->op_private & OPpPV_IS_UTF8) ? SVf_UTF8 : 0;
2560 PUTBACK;
2561 cxix = dopoptolabel(label, label_len, label_flags);
2562 if (cxix < 0)
2563 /* diag_listed_as: Label not found for "last %s" */
2564 Perl_croak(aTHX_ "Label not found for \"%s %"SVf"\"",
2565 opname,
2566 SVfARG(PL_op->op_flags & OPf_STACKED
2567 && !SvGMAGICAL(TOPp1s)
2568 ? TOPp1s
2569 : newSVpvn_flags(label,
2570 label_len,
2571 label_flags | SVs_TEMP)));
2572 }
2573 if (cxix < cxstack_ix)
2574 dounwind(cxix);
2575 return cxix;
2576}
2577
2578PP(pp_last)
2579{
eb578fdb 2580 PERL_CONTEXT *cx;
5da525e9 2581 OP* nextop;
9d4ba2ae 2582
1f039d60 2583 S_unwind_loop(aTHX_ "last");
a0d0e21e 2584
4df352a8
DM
2585 cx = &cxstack[cxstack_ix];
2586
d3e5e568
DM
2587 assert(
2588 CxTYPE(cx) == CXt_LOOP_LAZYIV
2589 || CxTYPE(cx) == CXt_LOOP_LAZYSV
2590 || CxTYPE(cx) == CXt_LOOP_FOR
2591 || CxTYPE(cx) == CXt_LOOP_PLAIN
2592 );
f7d0774b 2593 PL_stack_sp = PL_stack_base + cx->blk_loop.resetsp;
a0d0e21e 2594
a1f49e72 2595 TAINT_NOT;
f86702cc
PP
2596
2597 /* Stack values are safe: */
2f450c1b 2598 CX_LEAVE_SCOPE(cx);
d3e5e568 2599 POPLOOP(cx); /* release loop vars ... */
dd748f45 2600 POPBLOCK(cx);
5da525e9
DM
2601 nextop = cx->blk_loop.my_op->op_lastop->op_next;
2602 CX_POP(cx);
a0d0e21e 2603
5da525e9 2604 return nextop;
a0d0e21e
LW
2605}
2606
2607PP(pp_next)
2608{
eb578fdb 2609 PERL_CONTEXT *cx;
a0d0e21e 2610
1f039d60 2611 S_unwind_loop(aTHX_ "next");
a0d0e21e 2612
1ba6ee2b 2613 TOPBLOCK(cx);
3a1b2b9e 2614 PL_curcop = cx->blk_oldcop;
47c9d59f 2615 PERL_ASYNC_CHECK();
d57ce4df 2616 return (cx)->blk_loop.my_op->op_nextop;
a0d0e21e
LW
2617}
2618
2619PP(pp_redo)
2620{
1f039d60 2621 const I32 cxix = S_unwind_loop(aTHX_ "redo");
eb578fdb 2622 PERL_CONTEXT *cx;
1f039d60 2623 OP* redo_op = cxstack[cxix].blk_loop.my_op->op_redoop;
a0d0e21e 2624
a034e688
DM
2625 if (redo_op->op_type == OP_ENTER) {
2626 /* pop one less context to avoid $x being freed in while (my $x..) */
2627 cxstack_ix++;
2628 assert(CxTYPE(&cxstack[cxstack_ix]) == CXt_BLOCK);
2629 redo_op = redo_op->op_next;
2630 }
2631
a0d0e21e 2632 TOPBLOCK(cx);
dfe0f39b 2633 CX_LEAVE_SCOPE(cx);
936c78b5 2634 FREETMPS;
3a1b2b9e 2635 PL_curcop = cx->blk_oldcop;
47c9d59f 2636 PERL_ASYNC_CHECK();
a034e688 2637 return redo_op;
a0d0e21e
LW
2638}
2639
0824fdcb 2640STATIC OP *
5db1eb8d 2641S_dofindlabel(pTHX_ OP *o, const char *label, STRLEN len, U32 flags, OP **opstack, OP **oplimit)
a0d0e21e 2642{
a0d0e21e 2643 OP **ops = opstack;
a1894d81 2644 static const char* const too_deep = "Target of goto is too deeply nested";
a0d0e21e 2645
7918f24d
NC
2646 PERL_ARGS_ASSERT_DOFINDLABEL;
2647
fc36a67e 2648 if (ops >= oplimit)
0157ef98 2649 Perl_croak(aTHX_ "%s", too_deep);
11343788
MB
2650 if (o->op_type == OP_LEAVE ||
2651 o->op_type == OP_SCOPE ||
2652 o->op_type == OP_LEAVELOOP ||
33d34e4c 2653 o->op_type == OP_LEAVESUB ||
11343788 2654 o->op_type == OP_LEAVETRY)
fc36a67e 2655 {
5dc0d613 2656 *ops++ = cUNOPo->op_first;
fc36a67e 2657 if (ops >= oplimit)
0157ef98 2658 Perl_croak(aTHX_ "%s", too_deep);
fc36a67e 2659 }
c4aa4e48 2660 *ops = 0;
11343788 2661 if (o->op_flags & OPf_KIDS) {
aec46f14 2662 OP *kid;
a0d0e21e 2663 /* First try all the kids at this level, since that's likeliest. */
e6dae479 2664 for (kid = cUNOPo->op_first; kid; kid = OpSIBLING(kid)) {
7e8f1eac 2665 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) {
5db1eb8d
BF
2666 STRLEN kid_label_len;
2667 U32 kid_label_flags;
2668 const char *kid_label = CopLABEL_len_flags(kCOP,
2669 &kid_label_len, &kid_label_flags);
2670 if (kid_label && (
2671 ( (kid_label_flags & SVf_UTF8) != (flags & SVf_UTF8) ) ?
2672 (flags & SVf_UTF8)
2673 ? (bytes_cmp_utf8(
2674 (const U8*)kid_label, kid_label_len,
2675 (const U8*)label, len) == 0)
2676 : (bytes_cmp_utf8(
2677 (const U8*)label, len,
2678 (const U8*)kid_label, kid_label_len) == 0)
eade7155
BF
2679 : ( len == kid_label_len && ((kid_label == label)
2680 || memEQ(kid_label, label, len)))))
7e8f1eac
AD
2681 return kid;
2682 }
a0d0e21e 2683 }
e6dae479 2684 for (kid = cUNOPo->op_first; kid; kid = OpSIBLING(kid)) {
3280af22 2685 if (kid == PL_lastgotoprobe)
a0d0e21e 2686 continue;
ed8d0fe2
SM
2687 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) {
2688 if (ops == opstack)
2689 *ops++ = kid;
2690 else if (ops[-1]->op_type == OP_NEXTSTATE ||
2691 ops[-1]->op_type == OP_DBSTATE)
2692 ops[-1] = kid;
2693 else
2694 *ops++ = kid;
2695 }
5db1eb8d 2696 if ((o = dofindlabel(kid, label, len, flags, ops, oplimit)))
11343788 2697 return o;
a0d0e21e
LW
2698 }
2699 }
c4aa4e48 2700 *ops = 0;
a0d0e21e
LW
2701 return 0;
2702}
2703
b1c05ba5
DM
2704
2705/* also used for: pp_dump() */
2706
2707PP(pp_goto)
a0d0e21e 2708{
27da23d5 2709 dVAR; dSP;
cbbf8932 2710 OP *retop = NULL;
a0d0e21e 2711 I32 ix;
eb578fdb 2712 PERL_CONTEXT *cx;
fc36a67e
PP
2713#define GOTO_DEPTH 64
2714 OP *enterops[GOTO_DEPTH];
cbbf8932 2715 const char *label = NULL;
5db1eb8d
BF
2716 STRLEN label_len = 0;
2717 U32 label_flags = 0;
bfed75c6 2718 const bool do_dump = (PL_op->op_type == OP_DUMP);
a1894d81 2719 static const char* const must_have_label = "goto must have label";
a0d0e21e 2720
533c011a 2721 if (PL_op->op_flags & OPf_STACKED) {
7d1d69cb
DM
2722 /* goto EXPR or goto &foo */
2723
9d4ba2ae 2724 SV * const sv = POPs;
55b37f1c 2725 SvGETMAGIC(sv);
a0d0e21e 2726
a0d0e21e 2727 if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVCV) {
0fa3d31d 2728 /* This egregious kludge implements goto &subroutine */
a0d0e21e 2729 I32 cxix;
eb578fdb 2730 PERL_CONTEXT *cx;
ea726b52 2731 CV *cv = MUTABLE_CV(SvRV(sv));
049bd5ff 2732 AV *arg = GvAV(PL_defgv);
a0d0e21e 2733
5d52e310 2734 while (!CvROOT(cv) && !CvXSUB(cv)) {
7fc63493 2735 const GV * const gv = CvGV(cv);
e8f7dd13 2736 if (gv) {
7fc63493 2737 GV *autogv;
e8f7dd13
GS
2738 SV *tmpstr;
2739 /* autoloaded stub? */
2740 if (cv != GvCV(gv) && (cv = GvCV(gv)))
5d52e310 2741 continue;
c271df94
BF
2742 autogv = gv_autoload_pvn(GvSTASH(gv), GvNAME(gv),
2743 GvNAMELEN(gv),
2744 GvNAMEUTF8(gv) ? SVf_UTF8 : 0);
e8f7dd13 2745 if (autogv && (cv = GvCV(autogv)))
5d52e310 2746 continue;
e8f7dd13 2747 tmpstr = sv_newmortal();
c445ea15 2748 gv_efullname3(tmpstr, gv, NULL);
be2597df 2749 DIE(aTHX_ "Goto undefined subroutine &%"SVf"", SVfARG(tmpstr));
4aa0a1f7 2750 }
cea2e8a9 2751 DIE(aTHX_ "Goto undefined subroutine");
4aa0a1f7
AD
2752 }
2753
a0d0e21e 2754 cxix = dopoptosub(cxstack_ix);
d338c0c2
DM
2755 if (cxix < 0) {
2756 DIE(aTHX_ "Can't goto subroutine outside a subroutine");
8da3792e 2757 }
d338c0c2 2758 cx = &cxstack[cxix];
564abe23 2759 /* ban goto in eval: see <20050521150056.GC20213@iabyn.com> */
2d43a17f 2760 if (CxTYPE(cx) == CXt_EVAL) {
c74ace89 2761 if (CxREALEVAL(cx))
00455a92 2762 /* diag_listed_as: Can't goto subroutine from an eval-%s */
c74ace89
DM
2763 DIE(aTHX_ "Can't goto subroutine from an eval-string");
2764 else
00455a92 2765 /* diag_listed_as: Can't goto subroutine from an eval-%s */
c74ace89 2766 DIE(aTHX_ "Can't goto subroutine from an eval-block");
2d43a17f 2767 }
9850bf21
RH
2768 else if (CxMULTICALL(cx))
2769 DIE(aTHX_ "Can't goto subroutine from a sort sub (or similar callback)");
d338c0c2
DM
2770
2771 /* First do some returnish stuff. */
2772
2773 SvREFCNT_inc_simple_void(cv); /* avoid premature free during unwind */
2774 FREETMPS;
2775 if (cxix < cxstack_ix) {
2776 dounwind(cxix);
2777 }
2778 TOPBLOCK(cx);
2779 SPAGAIN;
39de75fd 2780
8ae997c5
DM
2781 /* protect @_ during save stack unwind. */
2782 if (arg)
2783 SvREFCNT_inc_NN(sv_2mortal(MUTABLE_SV(arg)));
2784
2785 assert(PL_scopestack_ix == cx->blk_oldscopesp);
dfe0f39b 2786 CX_LEAVE_SCOPE(cx);
8ae997c5 2787
bafb2adc 2788 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)) {
04e686b8 2789 /* this is POPSUB_ARGS() with minor variations */
9513529b 2790 AV* av = MUTABLE_AV(PAD_SVl(0));
e2657e18
DM
2791 assert(AvARRAY(MUTABLE_AV(
2792 PadlistARRAY(CvPADLIST(cx->blk_sub.cv))[
2793 CvDEPTH(cx->blk_sub.cv)])) == PL_curpad);
2794
f72bdec3
DM
2795 /* we are going to donate the current @_ from the old sub
2796 * to the new sub. This first part of the donation puts a
2797 * new empty AV in the pad[0] slot of the old sub,
2798 * unless pad[0] and @_ differ (e.g. if the old sub did
2799 * local *_ = []); in which case clear the old pad[0]
2800 * array in the usual way */
95b2f486
DM
2801 if (av == arg || AvREAL(av))
2802 clear_defarray(av, av == arg);
049bd5ff 2803 else CLEAR_ARGARRAY(av);
a0d0e21e 2804 }
88c11d84 2805
b1e25d05
DM
2806 /* don't restore PL_comppad here. It won't be needed if the
2807 * sub we're going to is non-XS, but restoring it early then
2808 * croaking (e.g. the "Goto undefined subroutine" below)
2809 * means the CX block gets processed again in dounwind,
2810 * but this time with the wrong PL_comppad */
88c11d84 2811
1d59c038
FC
2812 /* A destructor called during LEAVE_SCOPE could have undefined
2813 * our precious cv. See bug #99850. */
2814 if (!CvROOT(cv) && !CvXSUB(cv)) {
2815 const GV * const gv = CvGV(cv);
2816 if (gv) {
2817 SV * const tmpstr = sv_newmortal();
2818 gv_efullname3(tmpstr, gv, NULL);
2819 DIE(aTHX_ "Goto undefined subroutine &%"SVf"",
2820 SVfARG(tmpstr));
2821 }
2822 DIE(aTHX_ "Goto undefined subroutine");
2823 }
2824
cd17cc2e
DM
2825 if (CxTYPE(cx) == CXt_SUB) {
2826 CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth;
2827 SvREFCNT_dec_NN(cx->blk_sub.cv);
2828 }
2829
a0d0e21e 2830 /* Now do some callish stuff. */
aed2304a 2831 if (CvISXSUB(cv)) {
ad39f3a2 2832 const SSize_t items = arg ? AvFILL(arg) + 1 : 0;
cd313eb4 2833 const bool m = arg ? cBOOL(SvRMAGICAL(arg)) : 0;
049bd5ff
FC
2834 SV** mark;
2835
8ae997c5 2836 ENTER;
80774f05
DM
2837 SAVETMPS;
2838 SAVEFREESV(cv); /* later, undo the 'avoid premature free' hack */
2839
049bd5ff 2840 /* put GvAV(defgv) back onto stack */
8c9d3376
FC
2841 if (items) {
2842 EXTEND(SP, items+1); /* @_ could have been extended. */
8c9d3376 2843 }
049bd5ff 2844 mark = SP;
ad39f3a2 2845 if (items) {
de935cc9 2846 SSize_t index;
ad39f3a2 2847 bool r = cBOOL(AvREAL(arg));
b1464ded 2848 for (index=0; index<items; index++)
ad39f3a2
FC
2849 {
2850 SV *sv;
2851 if (m) {
2852 SV ** const svp = av_fetch(arg, index, 0);
2853 sv = svp ? *svp : NULL;
dd2a7f90 2854 }
ad39f3a2
FC
2855 else sv = AvARRAY(arg)[index];
2856 SP[index+1] = sv
2857 ? r ? SvREFCNT_inc_NN(sv_2mortal(sv)) : sv
2858 : sv_2mortal(newSVavdefelem(arg, index, 1));
2859 }
049bd5ff 2860 }
ad39f3a2 2861 SP += items;
049bd5ff
FC
2862 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)) {
2863 /* Restore old @_ */
fad386cb 2864 POP_SAVEARRAY();
b1464ded 2865 }
1fa4e549 2866
51eb35b5 2867 retop = cx->blk_sub.retop;
b1e25d05
DM
2868 PL_comppad = cx->blk_sub.prevcomppad;
2869 PL_curpad = LIKELY(PL_comppad) ? AvARRAY(PL_comppad) : NULL;
8ae997c5
DM
2870
2871 /* XS subs don't have a CXt_SUB, so pop it;
2872 * this is a POPBLOCK(), less all the stuff we already did
2873 * for TOPBLOCK() earlier */
2874 PL_curcop = cx->blk_oldcop;
5da525e9 2875 CX_POP(cx);
8ae997c5 2876
b37c2d43
AL
2877 /* Push a mark for the start of arglist */
2878 PUSHMARK(mark);
2879 PUTBACK;
2880 (void)(*CvXSUB(cv))(aTHX_ cv);
a57c6685 2881 LEAVE;
51eb35b5 2882 goto _return;
a0d0e21e
LW
2883 }
2884 else {
b70d5558 2885 PADLIST * const padlist = CvPADLIST(cv);
39de75fd 2886
80774f05
DM
2887 SAVEFREESV(cv); /* later, undo the 'avoid premature free' hack */
2888
39de75fd
DM
2889 /* partial unrolled PUSHSUB(): */
2890
a0d0e21e 2891 cx->blk_sub.cv = cv;
1a5b3db4 2892 cx->blk_sub.olddepth = CvDEPTH(cv);
dd2155a4 2893
a0d0e21e 2894 CvDEPTH(cv)++;
2c50b7ed
DM
2895 SvREFCNT_inc_simple_void_NN(cv);
2896 if (CvDEPTH(cv) > 1) {
2b9dff67 2897 if (CvDEPTH(cv) == PERL_SUB_DEPTH_WARN && ckWARN(WARN_RECURSION))
44a8e56a 2898 sub_crush_depth(cv);
26019298 2899 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2900 }
426a09cd 2901 PL_curcop = cx->blk_oldcop;
fd617465 2902 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
bafb2adc 2903 if (CxHASARGS(cx))
6d4ff0d2 2904 {
f72bdec3
DM
2905 /* second half of donating @_ from the old sub to the
2906 * new sub: abandon the original pad[0] AV in the
2907 * new sub, and replace it with the donated @_.
2908 * pad[0] takes ownership of the extra refcount
2909 * we gave arg earlier */
bfa371b6
FC
2910 if (arg) {
2911 SvREFCNT_dec(PAD_SVl(0));
fed4514a 2912 PAD_SVl(0) = (SV *)arg;
13122036 2913 SvREFCNT_inc_simple_void_NN(arg);
bfa371b6 2914 }
049bd5ff
FC
2915
2916 /* GvAV(PL_defgv) might have been modified on scope
f72bdec3 2917 exit, so point it at arg again. */
049bd5ff
FC
2918 if (arg != GvAV(PL_defgv)) {
2919 AV * const av = GvAV(PL_defgv);
2920 GvAV(PL_defgv) = (AV *)SvREFCNT_inc_simple(arg);
2921 SvREFCNT_dec(av);
a0d0e21e
LW
2922 }
2923 }
13122036 2924
491527d0 2925 if (PERLDB_SUB) { /* Checking curstash breaks DProf. */
005a8a35 2926 Perl_get_db_sub(aTHX_ NULL, cv);
b37c2d43 2927 if (PERLDB_GOTO) {
b96d8cd9 2928 CV * const gotocv = get_cvs("DB::goto", 0);
b37c2d43
AL
2929 if (gotocv) {
2930 PUSHMARK( PL_stack_sp );
ad64d0ec 2931 call_sv(MUTABLE_SV(gotocv), G_SCALAR | G_NODEBUG);
b37c2d43
AL
2932 PL_stack_sp--;
2933 }
491527d0 2934 }
1ce6579f 2935 }
51eb35b5
DD
2936 retop = CvSTART(cv);
2937 goto putback_return;
a0d0e21e
LW
2938 }
2939 }
1614b0e3 2940 else {
7d1d69cb 2941 /* goto EXPR */
55b37f1c 2942 label = SvPV_nomg_const(sv, label_len);
5db1eb8d 2943 label_flags = SvUTF8(sv);
1614b0e3 2944 }
a0d0e21e 2945 }
2fc690dc 2946 else if (!(PL_op->op_flags & OPf_SPECIAL)) {
7d1d69cb 2947 /* goto LABEL or dump LABEL */
5db1eb8d
BF
2948 label = cPVOP->op_pv;
2949 label_flags = (cPVOP->op_private & OPpPV_IS_UTF8) ? SVf_UTF8 : 0;
2950 label_len = strlen(label);
2951 }
0157ef98 2952 if (!(do_dump || label_len)) DIE(aTHX_ "%s", must_have_label);
a0d0e21e 2953
f410a211
NC
2954 PERL_ASYNC_CHECK();
2955
3532f34a 2956 if (label_len) {
cbbf8932 2957 OP *gotoprobe = NULL;
3b2447bc 2958 bool leaving_eval = FALSE;
33d34e4c 2959 bool in_block = FALSE;
cbbf8932 2960 PERL_CONTEXT *last_eval_cx = NULL;
a0d0e21e
LW
2961
2962 /* find label */
2963
d4c19fe8 2964 PL_lastgotoprobe = NULL;
a0d0e21e
LW
2965 *enterops = 0;
2966 for (ix = cxstack_ix; ix >= 0; ix--) {
2967 cx = &cxstack[ix];
6b35e009 2968 switch (CxTYPE(cx)) {
a0d0e21e 2969 case CXt_EVAL:
3b2447bc 2970 leaving_eval = TRUE;
971ecbe6 2971 if (!CxTRYBLOCK(cx)) {
a4f3a277
RH
2972 gotoprobe = (last_eval_cx ?
2973 last_eval_cx->blk_eval.old_eval_root :
2974 PL_eval_root);
2975 last_eval_cx = cx;
9c5794fe
RH
2976 break;
2977 }
2978 /* else fall through */
c6fdafd0 2979 case CXt_LOOP_LAZYIV:
d01136d6 2980 case CXt_LOOP_LAZYSV:
3b719c58
NC
2981 case CXt_LOOP_FOR:
2982 case CXt_LOOP_PLAIN:
bb5aedc1
VP
2983 case CXt_GIVEN:
2984 case CXt_WHEN:
e6dae479 2985 gotoprobe = OpSIBLING(cx->blk_oldcop);
a0d0e21e
LW
2986 break;
2987 case CXt_SUBST:
2988 continue;
2989 case CXt_BLOCK:
33d34e4c 2990 if (ix) {
e6dae479 2991 gotoprobe = OpSIBLING(cx->blk_oldcop);
33d34e4c
AE
2992 in_block = TRUE;
2993 } else
3280af22 2994 gotoprobe = PL_main_root;
a0d0e21e 2995 break;
b3933176 2996 case CXt_SUB:
9850bf21 2997 if (CvDEPTH(cx->blk_sub.cv) && !CxMULTICALL(cx)) {
b3933176
CS
2998 gotoprobe = CvROOT(cx->blk_sub.cv);
2999 break;
3000 }
924ba076 3001 /* FALLTHROUGH */
7766f137 3002 case CXt_FORMAT:
0a753a76 3003 case CXt_NULL:
a651a37d 3004 DIE(aTHX_ "Can't \"goto\" out of a pseudo block");
a0d0e21e
LW
3005 default:
3006 if (ix)
5637ef5b
NC
3007 DIE(aTHX_ "panic: goto, type=%u, ix=%ld",
3008 CxTYPE(cx), (long) ix);
3280af22 3009 gotoprobe = PL_main_root;
a0d0e21e
LW
3010 break;
3011 }
2b597662 3012 if (gotoprobe) {
29e61fd9
DM
3013 OP *sibl1, *sibl2;
3014
5db1eb8d 3015 retop = dofindlabel(gotoprobe, label, label_len, label_flags,
2b597662
GS
3016 enterops, enterops + GOTO_DEPTH);
3017 if (retop)
3018 break;
e6dae479 3019 if ( (sibl1 = OpSIBLING(gotoprobe)) &&
29e61fd9 3020 sibl1->op_type == OP_UNSTACK &&
e6dae479 3021 (sibl2 = OpSIBLING(sibl1)))
29e61fd9
DM
3022 {
3023 retop = dofindlabel(sibl2,
5db1eb8d
BF
3024 label, label_len, label_flags, enterops,
3025 enterops + GOTO_DEPTH);
eae48c89
Z
3026 if (retop)
3027 break;
3028 }
2b597662 3029 }
3280af22 3030 PL_lastgotoprobe = gotoprobe;
a0d0e21e
LW
3031 }
3032 if (!retop)
b17a0679
FC
3033 DIE(aTHX_ "Can't find label %"UTF8f,
3034 UTF8fARG(label_flags, label_len, label));
a0d0e21e 3035
3b2447bc
RH
3036 /* if we're leaving an eval, check before we pop any frames
3037 that we're not going to punt, otherwise the error
3038 won't be caught */
3039
3040 if (leaving_eval && *enterops && enterops[1]) {
3041 I32 i;
3042 for (i = 1; enterops[i]; i++)
3043 if (enterops[i]->op_type == OP_ENTERITER)
3044 DIE(aTHX_ "Can't \"goto\" into the middle of a foreach loop");
3045 }
3046
b500e03b
GG
3047 if (*enterops && enterops[1]) {
3048 I32 i = enterops[1]->op_type == OP_ENTER && in_block ? 2 : 1;
3049 if (enterops[i])
3050 deprecate("\"goto\" to jump into a construct");
3051 }
3052
a0d0e21e
LW
3053 /* pop unwanted frames */
3054
3055 if (ix < cxstack_ix) {
a0d0e21e 3056 if (ix < 0)
5edb7975 3057 DIE(aTHX_ "panic: docatch: illegal ix=%ld", (long)ix);
a0d0e21e
LW
3058 dounwind(ix);
3059 TOPBLOCK(cx);
a0d0e21e
LW
3060 }
3061
3062 /* push wanted frames */
3063
748a9306 3064 if (*enterops && enterops[1]) {
0bd48802 3065 OP * const oldop = PL_op;
33d34e4c
AE
3066 ix = enterops[1]->op_type == OP_ENTER && in_block ? 2 : 1;
3067 for (; enterops[ix]; ix++) {
533c011a 3068 PL_op = enterops[ix];
84902520
TB
3069 /* Eventually we may want to stack the needed arguments
3070 * for each op. For now, we punt on the hard ones. */
533c011a 3071 if (PL_op->op_type == OP_ENTERITER)
894356b3 3072 DIE(aTHX_ "Can't \"goto\" into the middle of a foreach loop");
16c91539 3073 PL_op->op_ppaddr(aTHX);
a0d0e21e 3074 }
533c011a 3075 PL_op = oldop;
a0d0e21e
LW
3076 }
3077 }
3078
2631bbca 3079 if (do_dump) {
a5f75d66 3080#ifdef VMS
6b88bc9c 3081 if (!retop) retop = PL_main_start;
a5f75d66 3082#endif
3280af22
NIS
3083 PL_restartop = retop;
3084 PL_do_undump = TRUE;
a0d0e21e
LW
3085
3086 my_unexec();
3087
3280af22
NIS
3088 PL_restartop = 0; /* hmm, must be GNU unexec().. */
3089 PL_do_undump = FALSE;
a0d0e21e
LW
3090 }
3091
51eb35b5
DD
3092 putback_return:
3093 PL_stack_sp = sp;
3094 _return:
47c9d59f 3095 PERL_ASYNC_CHECK();
51eb35b5 3096 return retop;
a0d0e21e
LW
3097}
3098
3099PP(pp_exit)
3100{
39644a26 3101 dSP;
a0d0e21e
LW
3102 I32 anum;
3103
3104 if (MAXARG < 1)
3105 anum = 0;
9d3c658e
FC
3106 else if (!TOPs) {
3107 anum = 0; (void)POPs;
3108 }
ff0cee69 3109 else {
a0d0e21e 3110 anum = SvIVx(POPs);
d98f61e7 3111#ifdef VMS
5450b4d8
FC
3112 if (anum == 1
3113 && SvTRUE(cop_hints_fetch_pvs(PL_curcop, "vmsish_exit", 0)))
ff0cee69 3114 anum = 0;
97124ef6
FC
3115 VMSISH_HUSHED =
3116 VMSISH_HUSHED || (PL_curcop->op_private & OPpHUSH_VMSISH);
ff0cee69
PP
3117#endif
3118 }
cc3604b1 3119 PL_exit_flags |= PERL_EXIT_EXPECTED;
a0d0e21e 3120 my_exit(anum);
3280af22 3121 PUSHs(&PL_sv_undef);
a0d0e21e
LW
3122 RETURN;
3123}
3124
a0d0e21e
LW
3125/* Eval. */
3126
0824fdcb 3127STATIC void
cea2e8a9 3128S_save_lines(pTHX_ AV *array, SV *sv)
a0d0e21e 3129{
504618e9 3130 const char *s = SvPVX_const(sv);
890ce7af 3131 const char * const send = SvPVX_const(sv) + SvCUR(sv);
504618e9 3132 I32 line = 1;
a0d0e21e 3133
7918f24d
NC
3134 PERL_ARGS_ASSERT_SAVE_LINES;
3135
a0d0e21e 3136 while (s && s < send) {
f54cb97a 3137 const char *t;
b9f83d2f 3138 SV * const tmpstr = newSV_type(SVt_PVMG);
a0d0e21e 3139
1d963ff3 3140 t = (const char *)memchr(s, '\n', send - s);
a0d0e21e
LW
3141 if (t)
3142 t++;
3143 else
3144 t = send;
3145
3146 sv_setpvn(tmpstr, s, t - s);
3147 av_store(array, line++, tmpstr);
3148 s = t;
3149 }
3150}
3151
22f16304
RU
3152/*
3153=for apidoc docatch
3154
3155Check for the cases 0 or 3 of cur_env.je_ret, only used inside an eval context.
3156
31570 is used as continue inside eval,
3158
31593 is used for a die caught by an inner eval - continue inner loop
3160
75af9d73 3161See F<cop.h>: je_mustcatch, when set at any runlevel to TRUE, means eval ops must
22f16304
RU
3162establish a local jmpenv to handle exception traps.
3163
3164=cut
3165*/
0824fdcb 3166STATIC OP *
cea2e8a9 3167S_docatch(pTHX_ OP *o)
1e422769 3168{
6224f72b 3169 int ret;
06b5626a 3170 OP * const oldop = PL_op;
db36c5a1 3171 dJMPENV;
1e422769 3172
1e422769 3173#ifdef DEBUGGING
54310121 3174 assert(CATCH_GET == TRUE);
1e422769 3175#endif
312caa8e 3176 PL_op = o;
8bffa5f8 3177
14dd3ad8 3178 JMPENV_PUSH(ret);
6224f72b 3179 switch (ret) {
312caa8e 3180 case 0:
abd70938
DM
3181 assert(cxstack_ix >= 0);
3182 assert(CxTYPE(&cxstack[cxstack_ix]) == CXt_EVAL);
3183 cxstack[cxstack_ix].blk_eval.cur_top_env = PL_top_env;
14dd3ad8 3184 redo_body:
85aaa934 3185 CALLRUNOPS(aTHX);
312caa8e
CS
3186 break;
3187 case 3:
8bffa5f8 3188 /* die caught by an inner eval - continue inner loop */
febb3a6d
Z
3189 if (PL_restartop && PL_restartjmpenv == PL_top_env) {
3190 PL_restartjmpenv = NULL;
312caa8e
CS
3191 PL_op = PL_restartop;
3192 PL_restartop = 0;
3193 goto redo_body;
3194 }
924ba076 3195 /* FALLTHROUGH */
312caa8e 3196 default:
14dd3ad8 3197 JMPENV_POP;
533c011a 3198 PL_op = oldop;
6224f72b 3199 JMPENV_JUMP(ret);
e5964223 3200 NOT_REACHED; /* NOTREACHED */
1e422769 3201 }
14dd3ad8 3202 JMPENV_POP;
533c011a 3203 PL_op = oldop;
5f66b61c 3204 return NULL;
1e422769
PP
3205}
3206
a3985cdc
DM
3207
3208/*
3209=for apidoc find_runcv
3210
3211Locate the CV corresponding to the currently executing sub or eval.
796b6530
KW
3212If C<db_seqp> is non_null, skip CVs that are in the DB package and populate
3213C<*db_seqp> with the cop sequence number at the point that the DB:: code was
72d33970
FC
3214entered. (This allows debuggers to eval in the scope of the breakpoint
3215rather than in the scope of the debugger itself.)
a3985cdc
DM
3216
3217=cut
3218*/
3219
3220CV*
d819b83a 3221Perl_find_runcv(pTHX_ U32 *db_seqp)
a3985cdc 3222{
db4cf31d 3223 return Perl_find_runcv_where(aTHX_ 0, 0, db_seqp);
70794f7b
FC
3224}
3225
3226/* If this becomes part of the API, it might need a better name. */
3227CV *
db4cf31d 3228Perl_find_runcv_where(pTHX_ U8 cond, IV arg, U32 *db_seqp)
70794f7b 3229{
a3985cdc 3230 PERL_SI *si;
b4b0692a 3231 int level = 0;
a3985cdc 3232
d819b83a 3233 if (db_seqp)
c3923c33
DM
3234 *db_seqp =
3235 PL_curcop == &PL_compiling
3236 ? PL_cop_seqmax
3237 : PL_curcop->cop_seq;
3238
a3985cdc 3239 for (si = PL_curstackinfo; si; si = si->si_prev) {
06b5626a 3240 I32 ix;
a3985cdc 3241 for (ix = si->si_cxix; ix >= 0; ix--) {
06b5626a 3242 const PERL_CONTEXT *cx = &(si->si_cxstack[ix]);
70794f7b 3243 CV *cv = NULL;
d819b83a 3244 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
70794f7b 3245 cv = cx->blk_sub.cv;
d819b83a
DM
3246 /* skip DB:: code */
3247 if (db_seqp && PL_debstash && CvSTASH(cv) == PL_debstash) {
3248 *db_seqp = cx->blk_oldcop->cop_seq;
3249 continue;
3250 }
a453e28a
DM
3251 if (cx->cx_type & CXp_SUB_RE)
3252 continue;
d819b83a 3253 }
a3985cdc 3254 else if (CxTYPE(cx) == CXt_EVAL && !CxTRYBLOCK(cx))
70794f7b
FC
3255 cv = cx->blk_eval.cv;
3256 if (cv) {
3257 switch (cond) {
db4cf31d
FC
3258 case FIND_RUNCV_padid_eq:
3259 if (!CvPADLIST(cv)
b4db5868 3260 || CvPADLIST(cv)->xpadl_id != (U32)arg)
8771da69 3261 continue;
b4b0692a
FC
3262 return cv;
3263 case FIND_RUNCV_level_eq:
db4cf31d 3264 if (level++ != arg) continue;
70794f7b
FC
3265 /* GERONIMO! */
3266 default:
3267 return cv;
3268 }
3269 }
a3985cdc
DM
3270 }
3271 }
db4cf31d 3272 return cond == FIND_RUNCV_padid_eq ? NULL : PL_main_cv;
a3985cdc
DM
3273}
3274
3275
27e90453
DM
3276/* Run yyparse() in a setjmp wrapper. Returns:
3277 * 0: yyparse() successful
3278 * 1: yyparse() failed
3279 * 3: yyparse() died
3280 */
3281STATIC int
28ac2b49 3282S_try_yyparse(pTHX_ int gramtype)
27e90453
DM
3283{
3284 int ret;
3285 dJMPENV;
3286
3287 assert(CxTYPE(&cxstack[cxstack_ix]) == CXt_EVAL);
3288 JMPENV_PUSH(ret);
3289 switch (ret) {
3290 case 0:
28ac2b49 3291 ret = yyparse(gramtype) ? 1 : 0;
27e90453
DM
3292 break;
3293 case 3:
3294 break;
3295 default:
3296 JMPENV_POP;
3297 JMPENV_JUMP(ret);
e5964223 3298 NOT_REACHED; /* NOTREACHED */
27e90453
DM
3299 }
3300 JMPENV_POP;
3301 return ret;
3302}
3303
3304
104a8185
DM
3305/* Compile a require/do or an eval ''.
3306 *
a3985cdc 3307 * outside is the lexically enclosing CV (if any) that invoked us.
104a8185
DM
3308 * seq is the current COP scope value.
3309 * hh is the saved hints hash, if any.
3310 *
410be5db 3311 * Returns a bool indicating whether the compile was successful; if so,
104a8185
DM
3312 * PL_eval_start contains the first op of the compiled code; otherwise,
3313 * pushes undef.
3314 *
3315 * This function is called from two places: pp_require and pp_entereval.
3316 * These can be distinguished by whether PL_op is entereval.
7d116edc
FC
3317 */
3318
410be5db 3319STATIC bool
104a8185 3320S_doeval(pTHX_ int gimme, CV* outside, U32 seq, HV *hh)
a0d0e21e 3321{
20b7effb 3322 dSP;
46c461b5 3323 OP * const saveop = PL_op;
104a8185 3324 bool clear_hints = saveop->op_type != OP_ENTEREVAL;
f45b078d 3325 COP * const oldcurcop = PL_curcop;
26c9400e 3326 bool in_require = (saveop->op_type == OP_REQUIRE);
27e90453 3327 int yystatus;
676a678a 3328 CV *evalcv;
a0d0e21e 3329
27e90453 3330 PL_in_eval = (in_require
6dc8a9e4 3331 ? (EVAL_INREQUIRE | (PL_in_eval & EVAL_INEVAL))
a1941760
DM
3332 : (EVAL_INEVAL |
3333 ((PL_op->op_private & OPpEVAL_RE_REPARSING)
3334 ? EVAL_RE_REPARSING : 0)));
a0d0e21e 3335
1ce6579f
PP
3336 PUSHMARK(SP);
3337
676a678a
Z
3338 evalcv = MUTABLE_CV(newSV_type(SVt_PVCV));
3339 CvEVAL_on(evalcv);
2090ab20 3340 assert(CxTYPE(&cxstack[cxstack_ix]) == CXt_EVAL);
676a678a 3341 cxstack[cxstack_ix].blk_eval.cv = evalcv;
86a64801 3342 cxstack[cxstack_ix].blk_gimme = gimme;
2090ab20 3343
676a678a
Z
3344 CvOUTSIDE_SEQ(evalcv) = seq;
3345 CvOUTSIDE(evalcv) = MUTABLE_CV(SvREFCNT_inc_simple(outside));
a3985cdc 3346
dd2155a4 3347 /* set up a scratch pad */
a0d0e21e 3348
eacbb379 3349 CvPADLIST_set(evalcv, pad_new(padnew_SAVE));
cecbe010 3350 PL_op = NULL; /* avoid PL_op and PL_curpad referring to different CVs */
2c05e328 3351
07055b4c 3352
b5bbe64a 3353 SAVEMORTALIZESV(evalcv); /* must remain until end of current statement */
748a9306 3354
a0d0e21e
LW
3355 /* make sure we compile in the right package */
3356
ed094faf 3357 if (CopSTASH_ne(PL_curcop, PL_curstash)) {
03d9f026 3358 SAVEGENERICSV(PL_curstash);
cb1ad50e
FC
3359 PL_curstash = (HV *)CopSTASH(PL_curcop);
3360 if (SvTYPE(PL_curstash) != SVt_PVHV) PL_curstash = NULL;
3361 else SvREFCNT_inc_simple_void(PL_curstash);
a0d0e21e 3362 }
3c10abe3 3363 /* XXX:ajgo do we really need to alloc an AV for begin/checkunit */
3280af22
NIS
3364 SAVESPTR(PL_beginav);
3365 PL_beginav = newAV();
3366 SAVEFREESV(PL_beginav);
3c10abe3
AG
3367 SAVESPTR(PL_unitcheckav);
3368 PL_unitcheckav = newAV();
3369 SAVEFREESV(PL_unitcheckav);
a0d0e21e 3370
81d86705 3371
104a8185 3372 ENTER_with_name("evalcomp");
676a678a
Z
3373 SAVESPTR(PL_compcv);
3374 PL_compcv = evalcv;
3375
a0d0e21e
LW
3376 /* try to compile it */
3377
5f66b61c 3378 PL_eval_root = NULL;
3280af22 3379 PL_curcop = &PL_compiling;
26c9400e 3380 if ((saveop->op_type != OP_REQUIRE) && (saveop->op_flags & OPf_SPECIAL))
faef0170 3381 PL_in_eval |= EVAL_KEEPERR;
ab69dbc2
RGS
3382 else
3383 CLEAR_ERRSV();
27e90453 3384
377b5421
DM
3385 SAVEHINTS();
3386 if (clear_hints) {
3387 PL_hints = 0;
3388 hv_clear(GvHV(PL_hintgv));
3389 }
3390 else {
3391 PL_hints = saveop->op_private & OPpEVAL_COPHH
3392 ? oldcurcop->cop_hints : saveop->op_targ;
4f3e2518
DM
3393
3394 /* making 'use re eval' not be in scope when compiling the
3395 * qr/mabye_has_runtime_code_block/ ensures that we don't get
3396 * infinite recursion when S_has_runtime_code() gives a false
3397 * positive: the second time round, HINT_RE_EVAL isn't set so we
3398 * don't bother calling S_has_runtime_code() */
3399 if (PL_in_eval & EVAL_RE_REPARSING)
3400 PL_hints &= ~HINT_RE_EVAL;
3401
377b5421
DM
3402 if (hh) {
3403 /* SAVEHINTS created a new HV in PL_hintgv, which we need to GC */
3404 SvREFCNT_dec(GvHV(PL_hintgv));
3405 GvHV(PL_hintgv) = hh;
3406 }
3407 }
3408 SAVECOMPILEWARNINGS();
3409 if (clear_hints) {
3410 if (PL_dowarn & G_WARN_ALL_ON)
3411 PL_compiling.cop_warnings = pWARN_ALL ;
3412 else if (PL_dowarn & G_WARN_ALL_OFF)
3413 PL_compiling.cop_warnings = pWARN_NONE ;
3414 else
3415 PL_compiling.cop_warnings = pWARN_STD ;
3416 }
3417 else {
3418 PL_compiling.cop_warnings =
3419 DUP_WARNINGS(oldcurcop->cop_warnings);
3420 cophh_free(CopHINTHASH_get(&PL_compiling));
3421</