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eliminate weird gimme calc in pp_leave()
[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;
4633a7c4 288 LEAVE_SCOPE(cx->sb_oldsave);
a0d0e21e 289 POPSUBST(cx);
47c9d59f 290 PERL_ASYNC_CHECK();
a0d0e21e 291 RETURNOP(pm->op_next);
e5964223 292 NOT_REACHED; /* NOTREACHED */
a0d0e21e 293 }
8e5e9ebe 294 cx->sb_iters = saviters;
a0d0e21e 295 }
07bc277f 296 if (RX_MATCH_COPIED(rx) && RX_SUBBEG(rx) != orig) {
a0d0e21e
LW
297 m = s;
298 s = orig;
6502e081 299 assert(!RX_SUBOFFSET(rx));
07bc277f 300 cx->sb_orig = orig = RX_SUBBEG(rx);
a0d0e21e
LW
301 s = orig + (m - s);
302 cx->sb_strend = s + (cx->sb_strend - m);
303 }
07bc277f 304 cx->sb_m = m = RX_OFFS(rx)[0].start + orig;
db79b45b 305 if (m > s) {
bfed75c6 306 if (DO_UTF8(dstr) && !SvUTF8(cx->sb_targ))
4bac9ae4 307 sv_catpvn_nomg_utf8_upgrade(dstr, s, m - s, nsv);
db79b45b 308 else
4bac9ae4 309 sv_catpvn_nomg(dstr, s, m-s);
db79b45b 310 }
07bc277f 311 cx->sb_s = RX_OFFS(rx)[0].end + orig;
084916e3 312 { /* Update the pos() information. */
8ca8a454
NC
313 SV * const sv
314 = (pm->op_pmflags & PMf_NONDESTRUCT) ? cx->sb_dstr : cx->sb_targ;
084916e3 315 MAGIC *mg;
a911bb25
DM
316
317 /* the string being matched against may no longer be a string,
318 * e.g. $_=0; s/.../$_++/ge */
319
320 if (!SvPOK(sv))
321 SvPV_force_nomg_nolen(sv);
322
96c2a8ff
FC
323 if (!(mg = mg_find_mglob(sv))) {
324 mg = sv_magicext_mglob(sv);
084916e3 325 }
cda67c99 326 MgBYTEPOS_set(mg, sv, SvPVX(sv), m - orig);
084916e3 327 }
988e6e7e 328 if (old != rx)
d6106309 329 (void)ReREFCNT_inc(rx);
20be6587 330 /* update the taint state of various various variables in preparation
ef07e810
DM
331 * for calling the code block.
332 * See "how taint works" above pp_subst() */
284167a5 333 if (TAINTING_get) {
20be6587
DM
334 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
335 cx->sb_rxtainted |= SUBST_TAINT_PAT;
336
337 if ((cx->sb_rxtainted & SUBST_TAINT_PAT) ||
338 ((cx->sb_rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
339 == (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
340 )
341 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
342
343 if (cx->sb_iters > 1 && (cx->sb_rxtainted &
344 (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL)))
8ca8a454
NC
345 SvTAINTED_on((pm->op_pmflags & PMf_NONDESTRUCT)
346 ? cx->sb_dstr : cx->sb_targ);
20be6587
DM
347 TAINT_NOT;
348 }
d9f97599 349 rxres_save(&cx->sb_rxres, rx);
af9838cc 350 PL_curpm = pm;
29f2e912 351 RETURNOP(pm->op_pmstashstartu.op_pmreplstart);
a0d0e21e
LW
352}
353
c90c0ff4 354void
864dbfa3 355Perl_rxres_save(pTHX_ void **rsp, REGEXP *rx)
c90c0ff4
PP
356{
357 UV *p = (UV*)*rsp;
358 U32 i;
7918f24d
NC
359
360 PERL_ARGS_ASSERT_RXRES_SAVE;
96a5add6 361 PERL_UNUSED_CONTEXT;
c90c0ff4 362
07bc277f 363 if (!p || p[1] < RX_NPARENS(rx)) {
db2c6cb3 364#ifdef PERL_ANY_COW
6502e081 365 i = 7 + (RX_NPARENS(rx)+1) * 2;
ed252734 366#else
6502e081 367 i = 6 + (RX_NPARENS(rx)+1) * 2;
ed252734 368#endif
c90c0ff4 369 if (!p)
a02a5408 370 Newx(p, i, UV);
c90c0ff4
PP
371 else
372 Renew(p, i, UV);
373 *rsp = (void*)p;
374 }
375
5eabab15
DM
376 /* what (if anything) to free on croak */
377 *p++ = PTR2UV(RX_MATCH_COPIED(rx) ? RX_SUBBEG(rx) : NULL);
cf93c79d 378 RX_MATCH_COPIED_off(rx);
6c31ff74 379 *p++ = RX_NPARENS(rx);
c90c0ff4 380
db2c6cb3 381#ifdef PERL_ANY_COW
bdd9a1b1
NC
382 *p++ = PTR2UV(RX_SAVED_COPY(rx));
383 RX_SAVED_COPY(rx) = NULL;
ed252734
NC
384#endif
385
07bc277f
NC
386 *p++ = PTR2UV(RX_SUBBEG(rx));
387 *p++ = (UV)RX_SUBLEN(rx);
6502e081
DM
388 *p++ = (UV)RX_SUBOFFSET(rx);
389 *p++ = (UV)RX_SUBCOFFSET(rx);
07bc277f
NC
390 for (i = 0; i <= RX_NPARENS(rx); ++i) {
391 *p++ = (UV)RX_OFFS(rx)[i].start;
392 *p++ = (UV)RX_OFFS(rx)[i].end;
c90c0ff4
PP
393 }
394}
395
9c105995
NC
396static void
397S_rxres_restore(pTHX_ void **rsp, REGEXP *rx)
c90c0ff4
PP
398{
399 UV *p = (UV*)*rsp;
400 U32 i;
7918f24d
NC
401
402 PERL_ARGS_ASSERT_RXRES_RESTORE;
96a5add6 403 PERL_UNUSED_CONTEXT;
c90c0ff4 404
ed252734 405 RX_MATCH_COPY_FREE(rx);
cf93c79d 406 RX_MATCH_COPIED_set(rx, *p);
c90c0ff4 407 *p++ = 0;
6c31ff74 408 RX_NPARENS(rx) = *p++;
c90c0ff4 409
db2c6cb3 410#ifdef PERL_ANY_COW
bdd9a1b1
NC
411 if (RX_SAVED_COPY(rx))
412 SvREFCNT_dec (RX_SAVED_COPY(rx));
413 RX_SAVED_COPY(rx) = INT2PTR(SV*,*p);
ed252734
NC
414 *p++ = 0;
415#endif
416
07bc277f
NC
417 RX_SUBBEG(rx) = INT2PTR(char*,*p++);
418 RX_SUBLEN(rx) = (I32)(*p++);
6502e081
DM
419 RX_SUBOFFSET(rx) = (I32)*p++;
420 RX_SUBCOFFSET(rx) = (I32)*p++;
07bc277f
NC
421 for (i = 0; i <= RX_NPARENS(rx); ++i) {
422 RX_OFFS(rx)[i].start = (I32)(*p++);
423 RX_OFFS(rx)[i].end = (I32)(*p++);
c90c0ff4
PP
424 }
425}
426
9c105995
NC
427static void
428S_rxres_free(pTHX_ void **rsp)
c90c0ff4 429{
44f8325f 430 UV * const p = (UV*)*rsp;
7918f24d
NC
431
432 PERL_ARGS_ASSERT_RXRES_FREE;
96a5add6 433 PERL_UNUSED_CONTEXT;
c90c0ff4
PP
434
435 if (p) {
94010e71 436 void *tmp = INT2PTR(char*,*p);
6c31ff74 437#ifdef PERL_POISON
db2c6cb3 438#ifdef PERL_ANY_COW
6c31ff74 439 U32 i = 9 + p[1] * 2;
94010e71 440#else
6c31ff74 441 U32 i = 8 + p[1] * 2;
94010e71 442#endif
6c31ff74
NC
443#endif
444
db2c6cb3 445#ifdef PERL_ANY_COW
6c31ff74 446 SvREFCNT_dec (INT2PTR(SV*,p[2]));
ed252734 447#endif
6c31ff74
NC
448#ifdef PERL_POISON
449 PoisonFree(p, i, sizeof(UV));
450#endif
451
452 Safefree(tmp);
c90c0ff4 453 Safefree(p);
4608196e 454 *rsp = NULL;
c90c0ff4
PP
455 }
456}
457
a701009a
DM
458#define FORM_NUM_BLANK (1<<30)
459#define FORM_NUM_POINT (1<<29)
460
a0d0e21e
LW
461PP(pp_formline)
462{
20b7effb 463 dSP; dMARK; dORIGMARK;
eb578fdb 464 SV * const tmpForm = *++MARK;
086b26f3 465 SV *formsv; /* contains text of original format */
eb578fdb
KW
466 U32 *fpc; /* format ops program counter */
467 char *t; /* current append position in target string */
086b26f3 468 const char *f; /* current position in format string */
eb578fdb
KW
469 I32 arg;
470 SV *sv = NULL; /* current item */
086b26f3 471 const char *item = NULL;/* string value of current item */
9b4bdfd4
DM
472 I32 itemsize = 0; /* length (chars) of item, possibly truncated */
473 I32 itembytes = 0; /* as itemsize, but length in bytes */
086b26f3
DM
474 I32 fieldsize = 0; /* width of current field */
475 I32 lines = 0; /* number of lines that have been output */
476 bool chopspace = (strchr(PL_chopset, ' ') != NULL); /* does $: have space */
477 const char *chophere = NULL; /* where to chop current item */
f5ada144 478 STRLEN linemark = 0; /* pos of start of line in output */
65202027 479 NV value;
086b26f3 480 bool gotsome = FALSE; /* seen at least one non-blank item on this line */
9b4bdfd4 481 STRLEN len; /* length of current sv */
26e935cf 482 STRLEN linemax; /* estimate of output size in bytes */
1bd51a4c
IH
483 bool item_is_utf8 = FALSE;
484 bool targ_is_utf8 = FALSE;
bd7084a6 485 const char *fmt;
74e0ddf7 486 MAGIC *mg = NULL;
4ff700b9
DM
487 U8 *source; /* source of bytes to append */
488 STRLEN to_copy; /* how may bytes to append */
ea60cfe8 489 char trans; /* what chars to translate */
74e0ddf7 490
3808a683 491 mg = doparseform(tmpForm);
a0d0e21e 492
74e0ddf7 493 fpc = (U32*)mg->mg_ptr;
3808a683
DM
494 /* the actual string the format was compiled from.
495 * with overload etc, this may not match tmpForm */
496 formsv = mg->mg_obj;
497
74e0ddf7 498
3280af22 499 SvPV_force(PL_formtarget, len);
3808a683 500 if (SvTAINTED(tmpForm) || SvTAINTED(formsv))
125b9982 501 SvTAINTED_on(PL_formtarget);
1bd51a4c
IH
502 if (DO_UTF8(PL_formtarget))
503 targ_is_utf8 = TRUE;
26e935cf
DM
504 linemax = (SvCUR(formsv) * (IN_BYTES ? 1 : 3) + 1);
505 t = SvGROW(PL_formtarget, len + linemax + 1);
506 /* XXX from now onwards, SvCUR(PL_formtarget) is invalid */
a0d0e21e 507 t += len;
3808a683 508 f = SvPV_const(formsv, len);
a0d0e21e
LW
509
510 for (;;) {
511 DEBUG_f( {
bfed75c6 512 const char *name = "???";
a0d0e21e
LW
513 arg = -1;
514 switch (*fpc) {
515 case FF_LITERAL: arg = fpc[1]; name = "LITERAL"; break;
516 case FF_BLANK: arg = fpc[1]; name = "BLANK"; break;
517 case FF_SKIP: arg = fpc[1]; name = "SKIP"; break;
518 case FF_FETCH: arg = fpc[1]; name = "FETCH"; break;
519 case FF_DECIMAL: arg = fpc[1]; name = "DECIMAL"; break;
520
521 case FF_CHECKNL: name = "CHECKNL"; break;
522 case FF_CHECKCHOP: name = "CHECKCHOP"; break;
523 case FF_SPACE: name = "SPACE"; break;
524 case FF_HALFSPACE: name = "HALFSPACE"; break;
525 case FF_ITEM: name = "ITEM"; break;
526 case FF_CHOP: name = "CHOP"; break;
527 case FF_LINEGLOB: name = "LINEGLOB"; break;
528 case FF_NEWLINE: name = "NEWLINE"; break;
529 case FF_MORE: name = "MORE"; break;
530 case FF_LINEMARK: name = "LINEMARK"; break;
531 case FF_END: name = "END"; break;
bfed75c6 532 case FF_0DECIMAL: name = "0DECIMAL"; break;
a1b95068 533 case FF_LINESNGL: name = "LINESNGL"; break;
a0d0e21e
LW
534 }
535 if (arg >= 0)
bf49b057 536 PerlIO_printf(Perl_debug_log, "%-16s%ld\n", name, (long) arg);
a0d0e21e 537 else
bf49b057 538 PerlIO_printf(Perl_debug_log, "%-16s\n", name);
5f80b19c 539 } );
a0d0e21e 540 switch (*fpc++) {
4a73dc0b 541 case FF_LINEMARK: /* start (or end) of a line */
f5ada144 542 linemark = t - SvPVX(PL_formtarget);
a0d0e21e
LW
543 lines++;
544 gotsome = FALSE;
545 break;
546
4a73dc0b 547 case FF_LITERAL: /* append <arg> literal chars */
ea60cfe8
DM
548 to_copy = *fpc++;
549 source = (U8 *)f;
550 f += to_copy;
551 trans = '~';
75645721 552 item_is_utf8 = targ_is_utf8 ? !!DO_UTF8(formsv) : !!SvUTF8(formsv);
ea60cfe8 553 goto append;
a0d0e21e 554
4a73dc0b 555 case FF_SKIP: /* skip <arg> chars in format */
a0d0e21e
LW
556 f += *fpc++;
557 break;
558
4a73dc0b 559 case FF_FETCH: /* get next item and set field size to <arg> */
a0d0e21e
LW
560 arg = *fpc++;
561 f += arg;
562 fieldsize = arg;
563
564 if (MARK < SP)
565 sv = *++MARK;
566 else {
3280af22 567 sv = &PL_sv_no;
a2a5de95 568 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX), "Not enough format arguments");
a0d0e21e 569 }
125b9982
NT
570 if (SvTAINTED(sv))
571 SvTAINTED_on(PL_formtarget);
a0d0e21e
LW
572 break;
573
4a73dc0b 574 case FF_CHECKNL: /* find max len of item (up to \n) that fits field */
5a34cab7 575 {
5a34cab7 576 const char *s = item = SvPV_const(sv, len);
9b4bdfd4
DM
577 const char *send = s + len;
578
579 itemsize = 0;
580 item_is_utf8 = DO_UTF8(sv);
581 while (s < send) {
582 if (!isCNTRL(*s))
583 gotsome = TRUE;
584 else if (*s == '\n')
585 break;
586
587 if (item_is_utf8)
588 s += UTF8SKIP(s);
589 else
590 s++;
591 itemsize++;
592 if (itemsize == fieldsize)
593 break;
594 }
595 itembytes = s - item;
62db6ea5 596 chophere = s;
5a34cab7 597 break;
a0ed51b3 598 }
a0d0e21e 599
4a73dc0b 600 case FF_CHECKCHOP: /* like CHECKNL, but up to highest split point */
5a34cab7
NC
601 {
602 const char *s = item = SvPV_const(sv, len);
9b4bdfd4
DM
603 const char *send = s + len;
604 I32 size = 0;
605
606 chophere = NULL;
607 item_is_utf8 = DO_UTF8(sv);
608 while (s < send) {
609 /* look for a legal split position */
610 if (isSPACE(*s)) {
611 if (*s == '\r') {
612 chophere = s;
613 itemsize = size;
614 break;
615 }
616 if (chopspace) {
617 /* provisional split point */
618 chophere = s;
619 itemsize = size;
620 }
621 /* we delay testing fieldsize until after we've
622 * processed the possible split char directly
623 * following the last field char; so if fieldsize=3
624 * and item="a b cdef", we consume "a b", not "a".
625 * Ditto further down.
626 */
627 if (size == fieldsize)
628 break;
629 }
630 else {
631 if (strchr(PL_chopset, *s)) {
632 /* provisional split point */
633 /* for a non-space split char, we include
634 * the split char; hence the '+1' */
635 chophere = s + 1;
636 itemsize = size;
637 }
638 if (size == fieldsize)
639 break;
640 if (!isCNTRL(*s))
641 gotsome = TRUE;
642 }
643
644 if (item_is_utf8)
645 s += UTF8SKIP(s);
646 else
077dbbf3 647 s++;
9b4bdfd4
DM
648 size++;
649 }
650 if (!chophere || s == send) {
651 chophere = s;
652 itemsize = size;
653 }
654 itembytes = chophere - item;
655
5a34cab7 656 break;
a0d0e21e 657 }
a0d0e21e 658
4a73dc0b 659 case FF_SPACE: /* append padding space (diff of field, item size) */
a0d0e21e
LW
660 arg = fieldsize - itemsize;
661 if (arg) {
662 fieldsize -= arg;
663 while (arg-- > 0)
664 *t++ = ' ';
665 }
666 break;
667
4a73dc0b 668 case FF_HALFSPACE: /* like FF_SPACE, but only append half as many */
a0d0e21e
LW
669 arg = fieldsize - itemsize;
670 if (arg) {
671 arg /= 2;
672 fieldsize -= arg;
673 while (arg-- > 0)
674 *t++ = ' ';
675 }
676 break;
677
4a73dc0b 678 case FF_ITEM: /* append a text item, while blanking ctrl chars */
9b4bdfd4 679 to_copy = itembytes;
8aa7beb6
DM
680 source = (U8 *)item;
681 trans = 1;
8aa7beb6 682 goto append;
a0d0e21e 683
4a73dc0b 684 case FF_CHOP: /* (for ^*) chop the current item */
fb9282c3 685 if (sv != &PL_sv_no) {
5a34cab7
NC
686 const char *s = chophere;
687 if (chopspace) {
af68e756 688 while (isSPACE(*s))
5a34cab7
NC
689 s++;
690 }
9b4bdfd4
DM
691 if (SvPOKp(sv))
692 sv_chop(sv,s);
693 else
694 /* tied, overloaded or similar strangeness.
695 * Do it the hard way */
696 sv_setpvn(sv, s, len - (s-item));
5a34cab7
NC
697 SvSETMAGIC(sv);
698 break;
a0d0e21e 699 }
a0d0e21e 700
4a73dc0b 701 case FF_LINESNGL: /* process ^* */
a1b95068 702 chopspace = 0;
c67159e1 703 /* FALLTHROUGH */
4a73dc0b
DM
704
705 case FF_LINEGLOB: /* process @* */
5a34cab7 706 {
e32383e2 707 const bool oneline = fpc[-1] == FF_LINESNGL;
5a34cab7 708 const char *s = item = SvPV_const(sv, len);
7440a75b 709 const char *const send = s + len;
7440a75b 710
f3f2f1a3 711 item_is_utf8 = DO_UTF8(sv);
fb9282c3 712 chophere = s + len;
a1137ee5 713 if (!len)
7440a75b 714 break;
ea60cfe8 715 trans = 0;
0d21cefe 716 gotsome = TRUE;
4ff700b9
DM
717 source = (U8 *) s;
718 to_copy = len;
0d21cefe
DM
719 while (s < send) {
720 if (*s++ == '\n') {
721 if (oneline) {
9b4bdfd4 722 to_copy = s - item - 1;
0d21cefe
DM
723 chophere = s;
724 break;
725 } else {
726 if (s == send) {
0d21cefe
DM
727 to_copy--;
728 } else
729 lines++;
1bd51a4c 730 }
a0d0e21e 731 }
0d21cefe 732 }
a2c0032b
DM
733 }
734
ea60cfe8
DM
735 append:
736 /* append to_copy bytes from source to PL_formstring.
737 * item_is_utf8 implies source is utf8.
738 * if trans, translate certain characters during the copy */
a2c0032b
DM
739 {
740 U8 *tmp = NULL;
26e935cf 741 STRLEN grow = 0;
0325ce87
DM
742
743 SvCUR_set(PL_formtarget,
744 t - SvPVX_const(PL_formtarget));
745
0d21cefe
DM
746 if (targ_is_utf8 && !item_is_utf8) {
747 source = tmp = bytes_to_utf8(source, &to_copy);
0d21cefe
DM
748 } else {
749 if (item_is_utf8 && !targ_is_utf8) {
f5ada144 750 U8 *s;
0d21cefe 751 /* Upgrade targ to UTF8, and then we reduce it to
0325ce87
DM
752 a problem we have a simple solution for.
753 Don't need get magic. */
0d21cefe 754 sv_utf8_upgrade_nomg(PL_formtarget);
0325ce87 755 targ_is_utf8 = TRUE;
f5ada144
DM
756 /* re-calculate linemark */
757 s = (U8*)SvPVX(PL_formtarget);
26e935cf
DM
758 /* the bytes we initially allocated to append the
759 * whole line may have been gobbled up during the
760 * upgrade, so allocate a whole new line's worth
761 * for safety */
762 grow = linemax;
f5ada144
DM
763 while (linemark--)
764 s += UTF8SKIP(s);
765 linemark = s - (U8*)SvPVX(PL_formtarget);
e8e72d41 766 }
0d21cefe
DM
767 /* Easy. They agree. */
768 assert (item_is_utf8 == targ_is_utf8);
769 }
26e935cf
DM
770 if (!trans)
771 /* @* and ^* are the only things that can exceed
772 * the linemax, so grow by the output size, plus
773 * a whole new form's worth in case of any further
774 * output */
775 grow = linemax + to_copy;
776 if (grow)
777 SvGROW(PL_formtarget, SvCUR(PL_formtarget) + grow + 1);
0d21cefe
DM
778 t = SvPVX(PL_formtarget) + SvCUR(PL_formtarget);
779
780 Copy(source, t, to_copy, char);
ea60cfe8 781 if (trans) {
8aa7beb6
DM
782 /* blank out ~ or control chars, depending on trans.
783 * works on bytes not chars, so relies on not
784 * matching utf8 continuation bytes */
ea60cfe8
DM
785 U8 *s = (U8*)t;
786 U8 *send = s + to_copy;
787 while (s < send) {
8aa7beb6 788 const int ch = *s;
077dbbf3 789 if (trans == '~' ? (ch == '~') : isCNTRL(ch))
ea60cfe8
DM
790 *s = ' ';
791 s++;
792 }
793 }
794
0d21cefe
DM
795 t += to_copy;
796 SvCUR_set(PL_formtarget, SvCUR(PL_formtarget) + to_copy);
a1137ee5 797 if (tmp)
0d21cefe 798 Safefree(tmp);
5a34cab7 799 break;
a0d0e21e 800 }
a0d0e21e 801
4a73dc0b 802 case FF_0DECIMAL: /* like FF_DECIMAL but for 0### */
a0d0e21e 803 arg = *fpc++;
bd7084a6 804 fmt = (const char *)
a029fa42 805 ((arg & FORM_NUM_POINT) ? "%#0*.*" NVff : "%0*.*" NVff);
bd7084a6 806 goto ff_dec;
5d37acd6 807
bd7084a6
DM
808 case FF_DECIMAL: /* do @##, ^##, where <arg>=(precision|flags) */
809 arg = *fpc++;
bd7084a6 810 fmt = (const char *)
a029fa42 811 ((arg & FORM_NUM_POINT) ? "%#*.*" NVff : "%*.*" NVff);
bd7084a6 812 ff_dec:
784707d5
JP
813 /* If the field is marked with ^ and the value is undefined,
814 blank it out. */
a701009a 815 if ((arg & FORM_NUM_BLANK) && !SvOK(sv)) {
784707d5
JP
816 arg = fieldsize;
817 while (arg--)
818 *t++ = ' ';
819 break;
820 }
821 gotsome = TRUE;
822 value = SvNV(sv);
a1b95068 823 /* overflow evidence */
bfed75c6 824 if (num_overflow(value, fieldsize, arg)) {
a1b95068
LW
825 arg = fieldsize;
826 while (arg--)
827 *t++ = '#';
828 break;
829 }
784707d5
JP
830 /* Formats aren't yet marked for locales, so assume "yes". */
831 {
e8549682
JH
832 Size_t max = SvLEN(PL_formtarget) - (t - SvPVX(PL_formtarget));
833 int len;
67d796ae
KW
834 DECLARATION_FOR_LC_NUMERIC_MANIPULATION;
835 STORE_LC_NUMERIC_SET_TO_NEEDED();
51f14a05 836 arg &= ~(FORM_NUM_POINT|FORM_NUM_BLANK);
a4eca1d4
JH
837#ifdef USE_QUADMATH
838 {
839 const char* qfmt = quadmath_format_single(fmt);
840 int len;
841 if (!qfmt)
842 Perl_croak_nocontext("panic: quadmath invalid format \"%s\"", fmt);
843 len = quadmath_snprintf(t, max, qfmt, (int) fieldsize, (int) arg, value);
844 if (len == -1)
845 Perl_croak_nocontext("panic: quadmath_snprintf failed, format \"%s\"", qfmt);
846 if (qfmt != fmt)
847 Safefree(fmt);
848 }
849#else
b587c0e8
DM
850 /* we generate fmt ourselves so it is safe */
851 GCC_DIAG_IGNORE(-Wformat-nonliteral);
e8549682 852 len = my_snprintf(t, max, fmt, (int) fieldsize, (int) arg, value);
b587c0e8 853 GCC_DIAG_RESTORE;
a4eca1d4
JH
854#endif
855 PERL_MY_SNPRINTF_POST_GUARD(len, max);
a2287a13 856 RESTORE_LC_NUMERIC();
784707d5
JP
857 }
858 t += fieldsize;
859 break;
a1b95068 860
4a73dc0b 861 case FF_NEWLINE: /* delete trailing spaces, then append \n */
a0d0e21e 862 f++;
f5ada144 863 while (t-- > (SvPVX(PL_formtarget) + linemark) && *t == ' ') ;
a0d0e21e
LW
864 t++;
865 *t++ = '\n';
866 break;
867
4a73dc0b 868 case FF_BLANK: /* for arg==0: do '~'; for arg>0 : do '~~' */
a0d0e21e
LW
869 arg = *fpc++;
870 if (gotsome) {
871 if (arg) { /* repeat until fields exhausted? */
11f9eeaf
DM
872 fpc--;
873 goto end;
a0d0e21e
LW
874 }
875 }
876 else {
f5ada144 877 t = SvPVX(PL_formtarget) + linemark;
a0d0e21e
LW
878 lines--;
879 }
880 break;
881
4a73dc0b 882 case FF_MORE: /* replace long end of string with '...' */
5a34cab7
NC
883 {
884 const char *s = chophere;
885 const char *send = item + len;
886 if (chopspace) {
af68e756 887 while (isSPACE(*s) && (s < send))
5a34cab7 888 s++;
a0d0e21e 889 }
5a34cab7
NC
890 if (s < send) {
891 char *s1;
892 arg = fieldsize - itemsize;
893 if (arg) {
894 fieldsize -= arg;
895 while (arg-- > 0)
896 *t++ = ' ';
897 }
898 s1 = t - 3;
899 if (strnEQ(s1," ",3)) {
900 while (s1 > SvPVX_const(PL_formtarget) && isSPACE(s1[-1]))
901 s1--;
902 }
903 *s1++ = '.';
904 *s1++ = '.';
905 *s1++ = '.';
a0d0e21e 906 }
5a34cab7 907 break;
a0d0e21e 908 }
4a73dc0b
DM
909
910 case FF_END: /* tidy up, then return */
11f9eeaf 911 end:
bf2bec63 912 assert(t < SvPVX_const(PL_formtarget) + SvLEN(PL_formtarget));
a0d0e21e 913 *t = '\0';
b15aece3 914 SvCUR_set(PL_formtarget, t - SvPVX_const(PL_formtarget));
1bd51a4c
IH
915 if (targ_is_utf8)
916 SvUTF8_on(PL_formtarget);
3280af22 917 FmLINES(PL_formtarget) += lines;
a0d0e21e 918 SP = ORIGMARK;
11f9eeaf
DM
919 if (fpc[-1] == FF_BLANK)
920 RETURNOP(cLISTOP->op_first);
921 else
922 RETPUSHYES;
a0d0e21e
LW
923 }
924 }
925}
926
927PP(pp_grepstart)
928{
20b7effb 929 dSP;
a0d0e21e
LW
930 SV *src;
931
6cae08a8 932 if (PL_stack_base + TOPMARK == SP) {
a0d0e21e 933 (void)POPMARK;
54310121 934 if (GIMME_V == G_SCALAR)
6e449a3a 935 mXPUSHi(0);
533c011a 936 RETURNOP(PL_op->op_next->op_next);
a0d0e21e 937 }
6cae08a8 938 PL_stack_sp = PL_stack_base + TOPMARK + 1;
897d3989
NC
939 Perl_pp_pushmark(aTHX); /* push dst */
940 Perl_pp_pushmark(aTHX); /* push src */
d343c3ef 941 ENTER_with_name("grep"); /* enter outer scope */
a0d0e21e
LW
942
943 SAVETMPS;
ffd49c98 944 SAVE_DEFSV;
d343c3ef 945 ENTER_with_name("grep_item"); /* enter inner scope */
7766f137 946 SAVEVPTR(PL_curpm);
a0d0e21e 947
6cae08a8 948 src = PL_stack_base[TOPMARK];
60779a30 949 if (SvPADTMP(src)) {
6cae08a8 950 src = PL_stack_base[TOPMARK] = sv_mortalcopy(src);
a0ed822e
FC
951 PL_tmps_floor++;
952 }
a0d0e21e 953 SvTEMP_off(src);
ffd49c98 954 DEFSV_set(src);
a0d0e21e
LW
955
956 PUTBACK;
533c011a 957 if (PL_op->op_type == OP_MAPSTART)
897d3989 958 Perl_pp_pushmark(aTHX); /* push top */
533c011a 959 return ((LOGOP*)PL_op->op_next)->op_other;
a0d0e21e
LW
960}
961
a0d0e21e
LW
962PP(pp_mapwhile)
963{
20b7effb 964 dSP;
f54cb97a 965 const I32 gimme = GIMME_V;
6cae08a8 966 I32 items = (SP - PL_stack_base) - TOPMARK; /* how many new items */
a0d0e21e
LW
967 I32 count;
968 I32 shift;
969 SV** src;
ac27b0f5 970 SV** dst;
a0d0e21e 971
544f3153 972 /* first, move source pointer to the next item in the source list */
3280af22 973 ++PL_markstack_ptr[-1];
544f3153
GS
974
975 /* if there are new items, push them into the destination list */
4c90a460 976 if (items && gimme != G_VOID) {
544f3153
GS
977 /* might need to make room back there first */
978 if (items > PL_markstack_ptr[-1] - PL_markstack_ptr[-2]) {
979 /* XXX this implementation is very pessimal because the stack
980 * is repeatedly extended for every set of items. Is possible
981 * to do this without any stack extension or copying at all
982 * by maintaining a separate list over which the map iterates
18ef8bea 983 * (like foreach does). --gsar */
544f3153
GS
984
985 /* everything in the stack after the destination list moves
986 * towards the end the stack by the amount of room needed */
987 shift = items - (PL_markstack_ptr[-1] - PL_markstack_ptr[-2]);
988
989 /* items to shift up (accounting for the moved source pointer) */
990 count = (SP - PL_stack_base) - (PL_markstack_ptr[-1] - 1);
18ef8bea
BT
991
992 /* This optimization is by Ben Tilly and it does
993 * things differently from what Sarathy (gsar)
994 * is describing. The downside of this optimization is
995 * that leaves "holes" (uninitialized and hopefully unused areas)
996 * to the Perl stack, but on the other hand this
997 * shouldn't be a problem. If Sarathy's idea gets
998 * implemented, this optimization should become
999 * irrelevant. --jhi */
1000 if (shift < count)
1001 shift = count; /* Avoid shifting too often --Ben Tilly */
bfed75c6 1002
924508f0
GS
1003 EXTEND(SP,shift);
1004 src = SP;
1005 dst = (SP += shift);
3280af22
NIS
1006 PL_markstack_ptr[-1] += shift;
1007 *PL_markstack_ptr += shift;
544f3153 1008 while (count--)
a0d0e21e
LW
1009 *dst-- = *src--;
1010 }
544f3153 1011 /* copy the new items down to the destination list */
ac27b0f5 1012 dst = PL_stack_base + (PL_markstack_ptr[-2] += items) - 1;
22023b26 1013 if (gimme == G_ARRAY) {
b2a2a901
DM
1014 /* add returned items to the collection (making mortal copies
1015 * if necessary), then clear the current temps stack frame
1016 * *except* for those items. We do this splicing the items
1017 * into the start of the tmps frame (so some items may be on
59d53fd6 1018 * the tmps stack twice), then moving PL_tmps_floor above
b2a2a901
DM
1019 * them, then freeing the frame. That way, the only tmps that
1020 * accumulate over iterations are the return values for map.
1021 * We have to do to this way so that everything gets correctly
1022 * freed if we die during the map.
1023 */
1024 I32 tmpsbase;
1025 I32 i = items;
1026 /* make space for the slice */
1027 EXTEND_MORTAL(items);
1028 tmpsbase = PL_tmps_floor + 1;
1029 Move(PL_tmps_stack + tmpsbase,
1030 PL_tmps_stack + tmpsbase + items,
1031 PL_tmps_ix - PL_tmps_floor,
1032 SV*);
1033 PL_tmps_ix += items;
1034
1035 while (i-- > 0) {
1036 SV *sv = POPs;
1037 if (!SvTEMP(sv))
1038 sv = sv_mortalcopy(sv);
1039 *dst-- = sv;
1040 PL_tmps_stack[tmpsbase++] = SvREFCNT_inc_simple(sv);
1041 }
1042 /* clear the stack frame except for the items */
1043 PL_tmps_floor += items;
1044 FREETMPS;
1045 /* FREETMPS may have cleared the TEMP flag on some of the items */
1046 i = items;
1047 while (i-- > 0)
1048 SvTEMP_on(PL_tmps_stack[--tmpsbase]);
22023b26 1049 }
bfed75c6 1050 else {
22023b26
TP
1051 /* scalar context: we don't care about which values map returns
1052 * (we use undef here). And so we certainly don't want to do mortal
1053 * copies of meaningless values. */
1054 while (items-- > 0) {
b988aa42 1055 (void)POPs;
22023b26
TP
1056 *dst-- = &PL_sv_undef;
1057 }
b2a2a901 1058 FREETMPS;
22023b26 1059 }
a0d0e21e 1060 }
b2a2a901
DM
1061 else {
1062 FREETMPS;
1063 }
d343c3ef 1064 LEAVE_with_name("grep_item"); /* exit inner scope */
a0d0e21e
LW
1065
1066 /* All done yet? */
6cae08a8 1067 if (PL_markstack_ptr[-1] > TOPMARK) {
a0d0e21e
LW
1068
1069 (void)POPMARK; /* pop top */
d343c3ef 1070 LEAVE_with_name("grep"); /* exit outer scope */
a0d0e21e 1071 (void)POPMARK; /* pop src */
3280af22 1072 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 1073 (void)POPMARK; /* pop dst */
3280af22 1074 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 1075 if (gimme == G_SCALAR) {
7cc47870
RGS
1076 dTARGET;
1077 XPUSHi(items);
a0d0e21e 1078 }
54310121
PP
1079 else if (gimme == G_ARRAY)
1080 SP += items;
a0d0e21e
LW
1081 RETURN;
1082 }
1083 else {
1084 SV *src;
1085
d343c3ef 1086 ENTER_with_name("grep_item"); /* enter inner scope */
7766f137 1087 SAVEVPTR(PL_curpm);
a0d0e21e 1088
544f3153 1089 /* set $_ to the new source item */
3280af22 1090 src = PL_stack_base[PL_markstack_ptr[-1]];
60779a30 1091 if (SvPADTMP(src)) {
60779a30
DM
1092 src = sv_mortalcopy(src);
1093 }
a0d0e21e 1094 SvTEMP_off(src);
ffd49c98 1095 DEFSV_set(src);
a0d0e21e
LW
1096
1097 RETURNOP(cLOGOP->op_other);
1098 }
1099}
1100
a0d0e21e
LW
1101/* Range stuff. */
1102
1103PP(pp_range)
1104{
82334630 1105 if (GIMME_V == G_ARRAY)
1a67a97c 1106 return NORMAL;
538573f7 1107 if (SvTRUEx(PAD_SV(PL_op->op_targ)))
1a67a97c 1108 return cLOGOP->op_other;
538573f7 1109 else
1a67a97c 1110 return NORMAL;
a0d0e21e
LW
1111}
1112
1113PP(pp_flip)
1114{
39644a26 1115 dSP;
a0d0e21e 1116
82334630 1117 if (GIMME_V == G_ARRAY) {
1a67a97c 1118 RETURNOP(((LOGOP*)cUNOP->op_first)->op_other);
a0d0e21e
LW
1119 }
1120 else {
1121 dTOPss;
44f8325f 1122 SV * const targ = PAD_SV(PL_op->op_targ);
bfed75c6 1123 int flip = 0;
790090df 1124
bfed75c6 1125 if (PL_op->op_private & OPpFLIP_LINENUM) {
4e3399f9
YST
1126 if (GvIO(PL_last_in_gv)) {
1127 flip = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
1128 }
1129 else {
fafc274c 1130 GV * const gv = gv_fetchpvs(".", GV_ADD|GV_NOTQUAL, SVt_PV);
44f8325f
AL
1131 if (gv && GvSV(gv))
1132 flip = SvIV(sv) == SvIV(GvSV(gv));
4e3399f9 1133 }
bfed75c6
AL
1134 } else {
1135 flip = SvTRUE(sv);
1136 }
1137 if (flip) {
a0d0e21e 1138 sv_setiv(PAD_SV(cUNOP->op_first->op_targ), 1);
533c011a 1139 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e 1140 sv_setiv(targ, 1);
3e3baf6d 1141 SETs(targ);
a0d0e21e
LW
1142 RETURN;
1143 }
1144 else {
1145 sv_setiv(targ, 0);
924508f0 1146 SP--;
1a67a97c 1147 RETURNOP(((LOGOP*)cUNOP->op_first)->op_other);
a0d0e21e
LW
1148 }
1149 }
76f68e9b 1150 sv_setpvs(TARG, "");
a0d0e21e
LW
1151 SETs(targ);
1152 RETURN;
1153 }
1154}
1155
8e9bbdb9
RGS
1156/* This code tries to decide if "$left .. $right" should use the
1157 magical string increment, or if the range is numeric (we make
1158 an exception for .."0" [#18165]). AMS 20021031. */
1159
1160#define RANGE_IS_NUMERIC(left,right) ( \
b0e74086
RGS
1161 SvNIOKp(left) || (SvOK(left) && !SvPOKp(left)) || \
1162 SvNIOKp(right) || (SvOK(right) && !SvPOKp(right)) || \
e0ab1c0e 1163 (((!SvOK(left) && SvOK(right)) || ((!SvOK(left) || \
b15aece3 1164 looks_like_number(left)) && SvPOKp(left) && *SvPVX_const(left) != '0')) \
e0ab1c0e 1165 && (!SvOK(right) || looks_like_number(right))))
8e9bbdb9 1166
a0d0e21e
LW
1167PP(pp_flop)
1168{
20b7effb 1169 dSP;
a0d0e21e 1170
82334630 1171 if (GIMME_V == G_ARRAY) {
a0d0e21e 1172 dPOPPOPssrl;
86cb7173 1173
5b295bef
RD
1174 SvGETMAGIC(left);
1175 SvGETMAGIC(right);
a0d0e21e 1176
8e9bbdb9 1177 if (RANGE_IS_NUMERIC(left,right)) {
b262c4c9 1178 IV i, j, n;
4d91eccc
FC
1179 if ((SvOK(left) && !SvIOK(left) && SvNV_nomg(left) < IV_MIN) ||
1180 (SvOK(right) && (SvIOK(right)
1181 ? SvIsUV(right) && SvUV(right) > IV_MAX
1182 : SvNV_nomg(right) > IV_MAX)))
d470f89e 1183 DIE(aTHX_ "Range iterator outside integer range");
f52e41ad 1184 i = SvIV_nomg(left);
b262c4c9
JH
1185 j = SvIV_nomg(right);
1186 if (j >= i) {
1187 /* Dance carefully around signed max. */
1188 bool overflow = (i <= 0 && j > SSize_t_MAX + i - 1);
1189 if (!overflow) {
1190 n = j - i + 1;
1191 /* The wraparound of signed integers is undefined
1192 * behavior, but here we aim for count >=1, and
1193 * negative count is just wrong. */
a1e27170
TC
1194 if (n < 1
1195#if IVSIZE > Size_t_size
1196 || n > SSize_t_MAX
1197#endif
1198 )
b262c4c9
JH
1199 overflow = TRUE;
1200 }
1201 if (overflow)
1202 Perl_croak(aTHX_ "Out of memory during list extend");
1203 EXTEND_MORTAL(n);
1204 EXTEND(SP, n);
bbce6d69 1205 }
c1ab3db2 1206 else
b262c4c9
JH
1207 n = 0;
1208 while (n--) {
fc01cab4 1209 SV * const sv = sv_2mortal(newSViv(i));
a0d0e21e 1210 PUSHs(sv);
fc01cab4
DM
1211 if (n) /* avoid incrementing above IV_MAX */
1212 i++;
a0d0e21e
LW
1213 }
1214 }
1215 else {
3c323193
FC
1216 STRLEN len, llen;
1217 const char * const lpv = SvPV_nomg_const(left, llen);
f52e41ad 1218 const char * const tmps = SvPV_nomg_const(right, len);
a0d0e21e 1219
3c323193 1220 SV *sv = newSVpvn_flags(lpv, llen, SvUTF8(left)|SVs_TEMP);
89ea2908 1221 while (!SvNIOKp(sv) && SvCUR(sv) <= len) {
a0d0e21e 1222 XPUSHs(sv);
b15aece3 1223 if (strEQ(SvPVX_const(sv),tmps))
89ea2908 1224 break;
a0d0e21e
LW
1225 sv = sv_2mortal(newSVsv(sv));
1226 sv_inc(sv);
1227 }
a0d0e21e
LW
1228 }
1229 }
1230 else {
1231 dTOPss;
901017d6 1232 SV * const targ = PAD_SV(cUNOP->op_first->op_targ);
4e3399f9 1233 int flop = 0;
a0d0e21e 1234 sv_inc(targ);
4e3399f9
YST
1235
1236 if (PL_op->op_private & OPpFLIP_LINENUM) {
1237 if (GvIO(PL_last_in_gv)) {
1238 flop = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
1239 }
1240 else {
fafc274c 1241 GV * const gv = gv_fetchpvs(".", GV_ADD|GV_NOTQUAL, SVt_PV);
4e3399f9
YST
1242 if (gv && GvSV(gv)) flop = SvIV(sv) == SvIV(GvSV(gv));
1243 }
1244 }
1245 else {
1246 flop = SvTRUE(sv);
1247 }
1248
1249 if (flop) {
a0d0e21e 1250 sv_setiv(PAD_SV(((UNOP*)cUNOP->op_first)->op_first->op_targ), 0);
396482e1 1251 sv_catpvs(targ, "E0");
a0d0e21e
LW
1252 }
1253 SETs(targ);
1254 }
1255
1256 RETURN;
1257}
1258
1259/* Control. */
1260
27da23d5 1261static const char * const context_name[] = {
515afda2 1262 "pseudo-block",
f31522f3 1263 NULL, /* CXt_WHEN never actually needs "block" */
76753e7f 1264 NULL, /* CXt_BLOCK never actually needs "block" */
f31522f3 1265 NULL, /* CXt_GIVEN never actually needs "block" */
76753e7f
NC
1266 NULL, /* CXt_LOOP_FOR never actually needs "loop" */
1267 NULL, /* CXt_LOOP_PLAIN never actually needs "loop" */
1268 NULL, /* CXt_LOOP_LAZYSV never actually needs "loop" */
1269 NULL, /* CXt_LOOP_LAZYIV never actually needs "loop" */
515afda2 1270 "subroutine",
76753e7f 1271 "format",
515afda2 1272 "eval",
515afda2 1273 "substitution",
515afda2
NC
1274};
1275
76e3520e 1276STATIC I32
5db1eb8d 1277S_dopoptolabel(pTHX_ const char *label, STRLEN len, U32 flags)
a0d0e21e 1278{
eb578fdb 1279 I32 i;
a0d0e21e 1280
7918f24d
NC
1281 PERL_ARGS_ASSERT_DOPOPTOLABEL;
1282
a0d0e21e 1283 for (i = cxstack_ix; i >= 0; i--) {
eb578fdb 1284 const PERL_CONTEXT * const cx = &cxstack[i];
6b35e009 1285 switch (CxTYPE(cx)) {
a0d0e21e 1286 case CXt_SUBST:
a0d0e21e 1287 case CXt_SUB:
7766f137 1288 case CXt_FORMAT:
a0d0e21e 1289 case CXt_EVAL:
0a753a76 1290 case CXt_NULL:
dcbac5bb 1291 /* diag_listed_as: Exiting subroutine via %s */
a2a5de95
NC
1292 Perl_ck_warner(aTHX_ packWARN(WARN_EXITING), "Exiting %s via %s",
1293 context_name[CxTYPE(cx)], OP_NAME(PL_op));
515afda2
NC
1294 if (CxTYPE(cx) == CXt_NULL)
1295 return -1;
1296 break;
c6fdafd0 1297 case CXt_LOOP_LAZYIV:
d01136d6 1298 case CXt_LOOP_LAZYSV:
3b719c58
NC
1299 case CXt_LOOP_FOR:
1300 case CXt_LOOP_PLAIN:
7e8f1eac 1301 {
5db1eb8d
BF
1302 STRLEN cx_label_len = 0;
1303 U32 cx_label_flags = 0;
1304 const char *cx_label = CxLABEL_len_flags(cx, &cx_label_len, &cx_label_flags);
1305 if (!cx_label || !(
1306 ( (cx_label_flags & SVf_UTF8) != (flags & SVf_UTF8) ) ?
1307 (flags & SVf_UTF8)
1308 ? (bytes_cmp_utf8(
1309 (const U8*)cx_label, cx_label_len,
1310 (const U8*)label, len) == 0)
1311 : (bytes_cmp_utf8(
1312 (const U8*)label, len,
1313 (const U8*)cx_label, cx_label_len) == 0)
eade7155
BF
1314 : (len == cx_label_len && ((cx_label == label)
1315 || memEQ(cx_label, label, len))) )) {
1c98cc53 1316 DEBUG_l(Perl_deb(aTHX_ "(poptolabel(): skipping label at cx=%ld %s)\n",
7e8f1eac 1317 (long)i, cx_label));
a0d0e21e
LW
1318 continue;
1319 }
1c98cc53 1320 DEBUG_l( Perl_deb(aTHX_ "(poptolabel(): found label at cx=%ld %s)\n", (long)i, label));
a0d0e21e 1321 return i;
7e8f1eac 1322 }
a0d0e21e
LW
1323 }
1324 }
1325 return i;
1326}
1327
0d863452
RH
1328
1329
e50aee73 1330I32
864dbfa3 1331Perl_dowantarray(pTHX)
e50aee73 1332{
f54cb97a 1333 const I32 gimme = block_gimme();
54310121
PP
1334 return (gimme == G_VOID) ? G_SCALAR : gimme;
1335}
1336
1337I32
864dbfa3 1338Perl_block_gimme(pTHX)
54310121 1339{
06b5626a 1340 const I32 cxix = dopoptosub(cxstack_ix);
a05700a8 1341 U8 gimme;
e50aee73 1342 if (cxix < 0)
46fc3d4c 1343 return G_VOID;
e50aee73 1344
a05700a8
DM
1345 gimme = (cxstack[cxix].blk_gimme & G_WANT);
1346 if (!gimme)
1347 Perl_croak(aTHX_ "panic: bad gimme: %d\n", gimme);
1348 return gimme;
e50aee73
AD
1349}
1350
a05700a8 1351
78f9721b
SM
1352I32
1353Perl_is_lvalue_sub(pTHX)
1354{
06b5626a 1355 const I32 cxix = dopoptosub(cxstack_ix);
78f9721b
SM
1356 assert(cxix >= 0); /* We should only be called from inside subs */
1357
bafb2adc
NC
1358 if (CxLVAL(cxstack + cxix) && CvLVALUE(cxstack[cxix].blk_sub.cv))
1359 return CxLVAL(cxstack + cxix);
78f9721b
SM
1360 else
1361 return 0;
1362}
1363
777d9014
FC
1364/* only used by PUSHSUB */
1365I32
1366Perl_was_lvalue_sub(pTHX)
1367{
777d9014
FC
1368 const I32 cxix = dopoptosub(cxstack_ix-1);
1369 assert(cxix >= 0); /* We should only be called from inside subs */
1370
1371 if (CxLVAL(cxstack + cxix) && CvLVALUE(cxstack[cxix].blk_sub.cv))
1372 return CxLVAL(cxstack + cxix);
1373 else
1374 return 0;
1375}
1376
76e3520e 1377STATIC I32
901017d6 1378S_dopoptosub_at(pTHX_ const PERL_CONTEXT *cxstk, I32 startingblock)
2c375eb9 1379{
a0d0e21e 1380 I32 i;
7918f24d
NC
1381
1382 PERL_ARGS_ASSERT_DOPOPTOSUB_AT;
81611534
JH
1383#ifndef DEBUGGING
1384 PERL_UNUSED_CONTEXT;
1385#endif
7918f24d 1386
a0d0e21e 1387 for (i = startingblock; i >= 0; i--) {
eb578fdb 1388 const PERL_CONTEXT * const cx = &cxstk[i];
6b35e009 1389 switch (CxTYPE(cx)) {
a0d0e21e
LW
1390 default:
1391 continue;
a0d0e21e 1392 case CXt_SUB:
5fbe8311
DM
1393 /* in sub foo { /(?{...})/ }, foo ends up on the CX stack
1394 * twice; the first for the normal foo() call, and the second
1395 * for a faked up re-entry into the sub to execute the
1396 * code block. Hide this faked entry from the world. */
1397 if (cx->cx_type & CXp_SUB_RE_FAKE)
1398 continue;
c67159e1 1399 /* FALLTHROUGH */
5fbe8311 1400 case CXt_EVAL:
7766f137 1401 case CXt_FORMAT:
1c98cc53 1402 DEBUG_l( Perl_deb(aTHX_ "(dopoptosub_at(): found sub at cx=%ld)\n", (long)i));
a0d0e21e
LW
1403 return i;
1404 }
1405 }
1406 return i;
1407}
1408
76e3520e 1409STATIC I32
cea2e8a9 1410S_dopoptoeval(pTHX_ I32 startingblock)
a0d0e21e
LW
1411{
1412 I32 i;
a0d0e21e 1413 for (i = startingblock; i >= 0; i--) {
eb578fdb 1414 const PERL_CONTEXT *cx = &cxstack[i];
6b35e009 1415 switch (CxTYPE(cx)) {
a0d0e21e
LW
1416 default:
1417 continue;
1418 case CXt_EVAL:
1c98cc53 1419 DEBUG_l( Perl_deb(aTHX_ "(dopoptoeval(): found eval at cx=%ld)\n", (long)i));
a0d0e21e
LW
1420 return i;
1421 }
1422 }
1423 return i;
1424}
1425
76e3520e 1426STATIC I32
cea2e8a9 1427S_dopoptoloop(pTHX_ I32 startingblock)
a0d0e21e
LW
1428{
1429 I32 i;
a0d0e21e 1430 for (i = startingblock; i >= 0; i--) {
eb578fdb 1431 const PERL_CONTEXT * const cx = &cxstack[i];
6b35e009 1432 switch (CxTYPE(cx)) {
a0d0e21e 1433 case CXt_SUBST:
a0d0e21e 1434 case CXt_SUB:
7766f137 1435 case CXt_FORMAT:
a0d0e21e 1436 case CXt_EVAL:
0a753a76 1437 case CXt_NULL:
dcbac5bb 1438 /* diag_listed_as: Exiting subroutine via %s */
a2a5de95
NC
1439 Perl_ck_warner(aTHX_ packWARN(WARN_EXITING), "Exiting %s via %s",
1440 context_name[CxTYPE(cx)], OP_NAME(PL_op));
515afda2
NC
1441 if ((CxTYPE(cx)) == CXt_NULL)
1442 return -1;
1443 break;
c6fdafd0 1444 case CXt_LOOP_LAZYIV:
d01136d6 1445 case CXt_LOOP_LAZYSV:
3b719c58
NC
1446 case CXt_LOOP_FOR:
1447 case CXt_LOOP_PLAIN:
1c98cc53 1448 DEBUG_l( Perl_deb(aTHX_ "(dopoptoloop(): found loop at cx=%ld)\n", (long)i));
a0d0e21e
LW
1449 return i;
1450 }
1451 }
1452 return i;
1453}
1454
97f2561e
DM
1455/* find the next GIVEN or FOR loop context block */
1456
0d863452 1457STATIC I32
97f2561e 1458S_dopoptogivenfor(pTHX_ I32 startingblock)
0d863452
RH
1459{
1460 I32 i;
1461 for (i = startingblock; i >= 0; i--) {
eb578fdb 1462 const PERL_CONTEXT *cx = &cxstack[i];
0d863452
RH
1463 switch (CxTYPE(cx)) {
1464 default:
1465 continue;
1466 case CXt_GIVEN:
97f2561e 1467 DEBUG_l( Perl_deb(aTHX_ "(dopoptogivenfor(): found given at cx=%ld)\n", (long)i));
0d863452 1468 return i;
3b719c58
NC
1469 case CXt_LOOP_PLAIN:
1470 assert(!CxFOREACHDEF(cx));
1471 break;
c6fdafd0 1472 case CXt_LOOP_LAZYIV:
d01136d6 1473 case CXt_LOOP_LAZYSV:
3b719c58 1474 case CXt_LOOP_FOR:
0d863452 1475 if (CxFOREACHDEF(cx)) {
97f2561e 1476 DEBUG_l( Perl_deb(aTHX_ "(dopoptogivenfor(): found foreach at cx=%ld)\n", (long)i));
0d863452
RH
1477 return i;
1478 }
1479 }
1480 }
1481 return i;
1482}
1483
1484STATIC I32
1485S_dopoptowhen(pTHX_ I32 startingblock)
1486{
1487 I32 i;
1488 for (i = startingblock; i >= 0; i--) {
eb578fdb 1489 const PERL_CONTEXT *cx = &cxstack[i];
0d863452
RH
1490 switch (CxTYPE(cx)) {
1491 default:
1492 continue;
1493 case CXt_WHEN:
1c98cc53 1494 DEBUG_l( Perl_deb(aTHX_ "(dopoptowhen(): found when at cx=%ld)\n", (long)i));
0d863452
RH
1495 return i;
1496 }
1497 }
1498 return i;
1499}
1500
a0d0e21e 1501void
864dbfa3 1502Perl_dounwind(pTHX_ I32 cxix)
a0d0e21e 1503{
a0d0e21e
LW
1504 I32 optype;
1505
f144f1e3
DM
1506 if (!PL_curstackinfo) /* can happen if die during thread cloning */
1507 return;
1508
a0d0e21e 1509 while (cxstack_ix > cxix) {
eb578fdb 1510 PERL_CONTEXT *cx = &cxstack[cxstack_ix];
1c98cc53 1511 DEBUG_CX("UNWIND"); \
a0d0e21e 1512 /* Note: we don't need to restore the base context info till the end. */
6b35e009 1513 switch (CxTYPE(cx)) {
c90c0ff4
PP
1514 case CXt_SUBST:
1515 POPSUBST(cx);
1516 continue; /* not break */
a0d0e21e 1517 case CXt_SUB:
88c90157 1518 POPSUB(cx);
a0d0e21e
LW
1519 break;
1520 case CXt_EVAL:
1521 POPEVAL(cx);
03e489bc
DM
1522 PL_tmps_floor = cx->cx_u.cx_blk.blku_old_tmpsfloor;
1523 break;
f5319de9 1524 case CXt_BLOCK:
c5369ccc 1525 POPBASICBLK(cx);
a0d0e21e 1526 break;
c6fdafd0 1527 case CXt_LOOP_LAZYIV:
d01136d6 1528 case CXt_LOOP_LAZYSV:
3b719c58
NC
1529 case CXt_LOOP_FOR:
1530 case CXt_LOOP_PLAIN:
a0d0e21e
LW
1531 POPLOOP(cx);
1532 break;
b95eccd3
DM
1533 case CXt_WHEN:
1534 POPWHEN(cx);
1535 break;
1536 case CXt_GIVEN:
1537 POPGIVEN(cx);
1538 break;
0a753a76 1539 case CXt_NULL:
a0d0e21e 1540 break;
7766f137
GS
1541 case CXt_FORMAT:
1542 POPFORMAT(cx);
1543 break;
a0d0e21e 1544 }
c90c0ff4 1545 cxstack_ix--;
a0d0e21e 1546 }
1b6737cc 1547 PERL_UNUSED_VAR(optype);
a0d0e21e
LW
1548}
1549
5a844595
GS
1550void
1551Perl_qerror(pTHX_ SV *err)
1552{
7918f24d
NC
1553 PERL_ARGS_ASSERT_QERROR;
1554
6b2fb389
DM
1555 if (PL_in_eval) {
1556 if (PL_in_eval & EVAL_KEEPERR) {
ecad31f0
BF
1557 Perl_ck_warner(aTHX_ packWARN(WARN_MISC), "\t(in cleanup) %"SVf,
1558 SVfARG(err));
6b2fb389
DM
1559 }
1560 else
1561 sv_catsv(ERRSV, err);
1562 }
5a844595
GS
1563 else if (PL_errors)
1564 sv_catsv(PL_errors, err);
1565 else
be2597df 1566 Perl_warn(aTHX_ "%"SVf, SVfARG(err));
13765c85
DM
1567 if (PL_parser)
1568 ++PL_parser->error_count;
5a844595
GS
1569}
1570
bb4c52e0 1571void
c5df3096 1572Perl_die_unwind(pTHX_ SV *msv)
a0d0e21e 1573{
c5df3096 1574 SV *exceptsv = sv_mortalcopy(msv);
96d9b9cd 1575 U8 in_eval = PL_in_eval;
c5df3096 1576 PERL_ARGS_ASSERT_DIE_UNWIND;
87582a92 1577
96d9b9cd 1578 if (in_eval) {
a0d0e21e 1579 I32 cxix;
a0d0e21e 1580
22a30693
Z
1581 /*
1582 * Historically, perl used to set ERRSV ($@) early in the die
1583 * process and rely on it not getting clobbered during unwinding.
1584 * That sucked, because it was liable to get clobbered, so the
1585 * setting of ERRSV used to emit the exception from eval{} has
1586 * been moved to much later, after unwinding (see just before
1587 * JMPENV_JUMP below). However, some modules were relying on the
1588 * early setting, by examining $@ during unwinding to use it as
1589 * a flag indicating whether the current unwinding was caused by
1590 * an exception. It was never a reliable flag for that purpose,
1591 * being totally open to false positives even without actual
1592 * clobberage, but was useful enough for production code to
1593 * semantically rely on it.
1594 *
1595 * We'd like to have a proper introspective interface that
1596 * explicitly describes the reason for whatever unwinding
1597 * operations are currently in progress, so that those modules
1598 * work reliably and $@ isn't further overloaded. But we don't
1599 * have one yet. In its absence, as a stopgap measure, ERRSV is
1600 * now *additionally* set here, before unwinding, to serve as the
1601 * (unreliable) flag that it used to.
1602 *
1603 * This behaviour is temporary, and should be removed when a
1604 * proper way to detect exceptional unwinding has been developed.
1605 * As of 2010-12, the authors of modules relying on the hack
1606 * are aware of the issue, because the modules failed on
1607 * perls 5.13.{1..7} which had late setting of $@ without this
1608 * early-setting hack.
1609 */
1610 if (!(in_eval & EVAL_KEEPERR)) {
1611 SvTEMP_off(exceptsv);
1612 sv_setsv(ERRSV, exceptsv);
1613 }
1614
fc941f37
Z
1615 if (in_eval & EVAL_KEEPERR) {
1616 Perl_ck_warner(aTHX_ packWARN(WARN_MISC), "\t(in cleanup) %"SVf,
1617 SVfARG(exceptsv));
1618 }
1619
5a844595
GS
1620 while ((cxix = dopoptoeval(cxstack_ix)) < 0
1621 && PL_curstackinfo->si_prev)
1622 {
bac4b2ad 1623 dounwind(-1);
d3acc0f7 1624 POPSTACK;
bac4b2ad 1625 }
e336de0d 1626
a0d0e21e
LW
1627 if (cxix >= 0) {
1628 I32 optype;
b6494f15 1629 SV *namesv;
eb578fdb 1630 PERL_CONTEXT *cx;
901017d6 1631 SV **newsp;
f7d0774b 1632 I32 gimme;
e32ff4e1 1633#ifdef DEBUGGING
8f89e5a9 1634 COP *oldcop;
20189068 1635#endif
8f89e5a9
Z
1636 JMPENV *restartjmpenv;
1637 OP *restartop;
a0d0e21e
LW
1638
1639 if (cxix < cxstack_ix)
1640 dounwind(cxix);
1641
f7d0774b
DM
1642 cx = &cxstack[cxstack_ix];
1643 assert(CxTYPE(cx) == CXt_EVAL);
1644 newsp = PL_stack_base + cx->blk_oldsp;
1645 gimme = cx->blk_gimme;
1646
1647 if (gimme == G_SCALAR)
1648 *++newsp = &PL_sv_undef;
1649 PL_stack_sp = newsp;
1650
1651
6b35e009 1652 if (CxTYPE(cx) != CXt_EVAL) {
7d0994e0 1653 STRLEN msglen;
96d9b9cd 1654 const char* message = SvPVx_const(exceptsv, msglen);
10edeb5d 1655 PerlIO_write(Perl_error_log, (const char *)"panic: die ", 11);
bf49b057 1656 PerlIO_write(Perl_error_log, message, msglen);
a0d0e21e
LW
1657 my_exit(1);
1658 }
f7d0774b
DM
1659
1660 POPBLOCK(cx,PL_curpm);
a0d0e21e 1661 POPEVAL(cx);
b6494f15 1662 namesv = cx->blk_eval.old_namesv;
e32ff4e1 1663#ifdef DEBUGGING
8f89e5a9 1664 oldcop = cx->blk_oldcop;
20189068 1665#endif
8f89e5a9
Z
1666 restartjmpenv = cx->blk_eval.cur_top_env;
1667 restartop = cx->blk_eval.retop;
a0d0e21e 1668
bb3300d1 1669 PL_tmps_floor = cx->cx_u.cx_blk.blku_old_tmpsfloor;
748a9306 1670
7a2e2cd6 1671 if (optype == OP_REQUIRE) {
e32ff4e1 1672 assert (PL_curcop == oldcop);
b6494f15 1673 (void)hv_store(GvHVn(PL_incgv),
ecad31f0 1674 SvPVX_const(namesv),
c60dbbc3 1675 SvUTF8(namesv) ? -(I32)SvCUR(namesv) : (I32)SvCUR(namesv),
27bcc0a7 1676 &PL_sv_undef, 0);
27e90453
DM
1677 /* note that unlike pp_entereval, pp_require isn't
1678 * supposed to trap errors. So now that we've popped the
1679 * EVAL that pp_require pushed, and processed the error
1680 * message, rethrow the error */
ecad31f0
BF
1681 Perl_croak(aTHX_ "%"SVf"Compilation failed in require",
1682 SVfARG(exceptsv ? exceptsv : newSVpvs_flags("Unknown error\n",
1683 SVs_TEMP)));
7a2e2cd6 1684 }
fc941f37 1685 if (!(in_eval & EVAL_KEEPERR))
96d9b9cd 1686 sv_setsv(ERRSV, exceptsv);
8f89e5a9
Z
1687 PL_restartjmpenv = restartjmpenv;
1688 PL_restartop = restartop;
bb4c52e0 1689 JMPENV_JUMP(3);
e5964223 1690 NOT_REACHED; /* NOTREACHED */
a0d0e21e
LW
1691 }
1692 }
87582a92 1693
96d9b9cd 1694 write_to_stderr(exceptsv);
f86702cc 1695 my_failure_exit();
e5964223 1696 NOT_REACHED; /* NOTREACHED */
a0d0e21e
LW
1697}
1698
1699PP(pp_xor)
1700{
20b7effb 1701 dSP; dPOPTOPssrl;
a0d0e21e
LW
1702 if (SvTRUE(left) != SvTRUE(right))
1703 RETSETYES;
1704 else
1705 RETSETNO;
1706}
1707
8dff4fc5 1708/*
dcccc8ff
KW
1709
1710=head1 CV Manipulation Functions
1711
8dff4fc5
BM
1712=for apidoc caller_cx
1713
72d33970 1714The XSUB-writer's equivalent of L<caller()|perlfunc/caller>. The
8dff4fc5 1715returned C<PERL_CONTEXT> structure can be interrogated to find all the
72d33970 1716information returned to Perl by C<caller>. Note that XSUBs don't get a
8dff4fc5
BM
1717stack frame, so C<caller_cx(0, NULL)> will return information for the
1718immediately-surrounding Perl code.
1719
1720This function skips over the automatic calls to C<&DB::sub> made on the
72d33970 1721behalf of the debugger. If the stack frame requested was a sub called by
8dff4fc5
BM
1722C<DB::sub>, the return value will be the frame for the call to
1723C<DB::sub>, since that has the correct line number/etc. for the call
72d33970 1724site. If I<dbcxp> is non-C<NULL>, it will be set to a pointer to the
8dff4fc5
BM
1725frame for the sub call itself.
1726
1727=cut
1728*/
1729
1730const PERL_CONTEXT *
1731Perl_caller_cx(pTHX_ I32 count, const PERL_CONTEXT **dbcxp)
a0d0e21e 1732{
eb578fdb
KW
1733 I32 cxix = dopoptosub(cxstack_ix);
1734 const PERL_CONTEXT *cx;
1735 const PERL_CONTEXT *ccstack = cxstack;
901017d6 1736 const PERL_SI *top_si = PL_curstackinfo;
27d41816 1737
a0d0e21e 1738 for (;;) {
2c375eb9
GS
1739 /* we may be in a higher stacklevel, so dig down deeper */
1740 while (cxix < 0 && top_si->si_type != PERLSI_MAIN) {
1741 top_si = top_si->si_prev;
1742 ccstack = top_si->si_cxstack;
1743 cxix = dopoptosub_at(ccstack, top_si->si_cxix);
1744 }
8dff4fc5
BM
1745 if (cxix < 0)
1746 return NULL;
f2a7f298 1747 /* caller() should not report the automatic calls to &DB::sub */
1748 if (PL_DBsub && GvCV(PL_DBsub) && cxix >= 0 &&
3280af22 1749 ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))
a0d0e21e
LW
1750 count++;
1751 if (!count--)
1752 break;
2c375eb9 1753 cxix = dopoptosub_at(ccstack, cxix - 1);
a0d0e21e 1754 }
2c375eb9
GS
1755
1756 cx = &ccstack[cxix];
8dff4fc5
BM
1757 if (dbcxp) *dbcxp = cx;
1758
7766f137 1759 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
f54cb97a 1760 const I32 dbcxix = dopoptosub_at(ccstack, cxix - 1);
2c375eb9 1761 /* We expect that ccstack[dbcxix] is CXt_SUB, anyway, the
06a5b730 1762 field below is defined for any cx. */
f2a7f298 1763 /* caller() should not report the automatic calls to &DB::sub */
1764 if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub))
2c375eb9 1765 cx = &ccstack[dbcxix];
06a5b730
PP
1766 }
1767
8dff4fc5
BM
1768 return cx;
1769}
1770
1771PP(pp_caller)
1772{
8dff4fc5 1773 dSP;
eb578fdb 1774 const PERL_CONTEXT *cx;
8dff4fc5 1775 const PERL_CONTEXT *dbcx;
48ebc325 1776 I32 gimme = GIMME_V;
d527ce7c 1777 const HEK *stash_hek;
8dff4fc5 1778 I32 count = 0;
ce0b554b 1779 bool has_arg = MAXARG && TOPs;
25502127 1780 const COP *lcop;
8dff4fc5 1781
ce0b554b
FC
1782 if (MAXARG) {
1783 if (has_arg)
8dff4fc5 1784 count = POPi;
ce0b554b
FC
1785 else (void)POPs;
1786 }
8dff4fc5 1787
ce0b554b 1788 cx = caller_cx(count + !!(PL_op->op_private & OPpOFFBYONE), &dbcx);
8dff4fc5 1789 if (!cx) {
48ebc325 1790 if (gimme != G_ARRAY) {
8dff4fc5
BM
1791 EXTEND(SP, 1);
1792 RETPUSHUNDEF;
1793 }
1794 RETURN;
1795 }
1796
fb55feef 1797 DEBUG_CX("CALLER");
d0279c7c 1798 assert(CopSTASH(cx->blk_oldcop));
e7886211
FC
1799 stash_hek = SvTYPE(CopSTASH(cx->blk_oldcop)) == SVt_PVHV
1800 ? HvNAME_HEK((HV*)CopSTASH(cx->blk_oldcop))
1801 : NULL;
48ebc325 1802 if (gimme != G_ARRAY) {
27d41816 1803 EXTEND(SP, 1);
d527ce7c 1804 if (!stash_hek)
3280af22 1805 PUSHs(&PL_sv_undef);
49d8d3a1
MB
1806 else {
1807 dTARGET;
d527ce7c 1808 sv_sethek(TARG, stash_hek);
49d8d3a1
MB
1809 PUSHs(TARG);
1810 }
a0d0e21e
LW
1811 RETURN;
1812 }
a0d0e21e 1813
b3ca2e83 1814 EXTEND(SP, 11);
27d41816 1815
d527ce7c 1816 if (!stash_hek)
3280af22 1817 PUSHs(&PL_sv_undef);
d527ce7c
BF
1818 else {
1819 dTARGET;
1820 sv_sethek(TARG, stash_hek);
1821 PUSHTARG;
1822 }
6e449a3a 1823 mPUSHs(newSVpv(OutCopFILE(cx->blk_oldcop), 0));
e6dae479 1824 lcop = closest_cop(cx->blk_oldcop, OpSIBLING(cx->blk_oldcop),
25502127
FC
1825 cx->blk_sub.retop, TRUE);
1826 if (!lcop)
1827 lcop = cx->blk_oldcop;
e9e9e546 1828 mPUSHu(CopLINE(lcop));
ce0b554b 1829 if (!has_arg)
a0d0e21e 1830 RETURN;
7766f137
GS
1831 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
1832 /* So is ccstack[dbcxix]. */
a5f47741 1833 if (CvHASGV(dbcx->blk_sub.cv)) {
ecf05a58 1834 PUSHs(cv_name(dbcx->blk_sub.cv, 0, 0));
bf38a478 1835 PUSHs(boolSV(CxHASARGS(cx)));
07b8c804
RGS
1836 }
1837 else {
84bafc02 1838 PUSHs(newSVpvs_flags("(unknown)", SVs_TEMP));
bf38a478 1839 PUSHs(boolSV(CxHASARGS(cx)));
07b8c804 1840 }
a0d0e21e
LW
1841 }
1842 else {
84bafc02 1843 PUSHs(newSVpvs_flags("(eval)", SVs_TEMP));
6e449a3a 1844 mPUSHi(0);
a0d0e21e 1845 }
54310121
PP
1846 gimme = (I32)cx->blk_gimme;
1847 if (gimme == G_VOID)
3280af22 1848 PUSHs(&PL_sv_undef);
54310121 1849 else
98625aca 1850 PUSHs(boolSV((gimme & G_WANT) == G_ARRAY));
6b35e009 1851 if (CxTYPE(cx) == CXt_EVAL) {
811a4de9 1852 /* eval STRING */
85a64632 1853 if (CxOLD_OP_TYPE(cx) == OP_ENTEREVAL) {
78beb4ca
TC
1854 SV *cur_text = cx->blk_eval.cur_text;
1855 if (SvCUR(cur_text) >= 2) {
1856 PUSHs(newSVpvn_flags(SvPVX(cur_text), SvCUR(cur_text)-2,
1857 SvUTF8(cur_text)|SVs_TEMP));
1858 }
1859 else {
1860 /* I think this is will always be "", but be sure */
1861 PUSHs(sv_2mortal(newSVsv(cur_text)));
1862 }
1863
3280af22 1864 PUSHs(&PL_sv_no);
0f79a09d 1865 }
811a4de9 1866 /* require */
0f79a09d 1867 else if (cx->blk_eval.old_namesv) {
6e449a3a 1868 mPUSHs(newSVsv(cx->blk_eval.old_namesv));
3280af22 1869 PUSHs(&PL_sv_yes);
06a5b730 1870 }
811a4de9
GS
1871 /* eval BLOCK (try blocks have old_namesv == 0) */
1872 else {
1873 PUSHs(&PL_sv_undef);
1874 PUSHs(&PL_sv_undef);
1875 }
4633a7c4 1876 }
a682de96
GS
1877 else {
1878 PUSHs(&PL_sv_undef);
1879 PUSHs(&PL_sv_undef);
1880 }
bafb2adc 1881 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)
ed094faf 1882 && CopSTASH_eq(PL_curcop, PL_debstash))
4633a7c4 1883 {
9513529b
DM
1884 /* slot 0 of the pad contains the original @_ */
1885 AV * const ary = MUTABLE_AV(AvARRAY(MUTABLE_AV(
1886 PadlistARRAY(CvPADLIST(cx->blk_sub.cv))[
1887 cx->blk_sub.olddepth+1]))[0]);
c70927a6 1888 const SSize_t off = AvARRAY(ary) - AvALLOC(ary);
a0d0e21e 1889
e1a80902 1890 Perl_init_dbargs(aTHX);
a0d0e21e 1891
3280af22
NIS
1892 if (AvMAX(PL_dbargs) < AvFILLp(ary) + off)
1893 av_extend(PL_dbargs, AvFILLp(ary) + off);
1894 Copy(AvALLOC(ary), AvARRAY(PL_dbargs), AvFILLp(ary) + 1 + off, SV*);
1895 AvFILLp(PL_dbargs) = AvFILLp(ary) + off;
a0d0e21e 1896 }
6e449a3a 1897 mPUSHi(CopHINTS_get(cx->blk_oldcop));
e476b1b5
GS
1898 {
1899 SV * mask ;
72dc9ed5 1900 STRLEN * const old_warnings = cx->blk_oldcop->cop_warnings ;
114bafba 1901
f07626ad 1902 if (old_warnings == pWARN_NONE)
e476b1b5 1903 mask = newSVpvn(WARN_NONEstring, WARNsize) ;
f07626ad
FC
1904 else if (old_warnings == pWARN_STD && (PL_dowarn & G_WARN_ON) == 0)
1905 mask = &PL_sv_undef ;
ac27b0f5 1906 else if (old_warnings == pWARN_ALL ||
75b6c4ca
RGS
1907 (old_warnings == pWARN_STD && PL_dowarn & G_WARN_ON)) {
1908 /* Get the bit mask for $warnings::Bits{all}, because
1909 * it could have been extended by warnings::register */
1910 SV **bits_all;
6673a63c 1911 HV * const bits = get_hv("warnings::Bits", 0);
017a3ce5 1912 if (bits && (bits_all=hv_fetchs(bits, "all", FALSE))) {
75b6c4ca
RGS
1913 mask = newSVsv(*bits_all);
1914 }
1915 else {
1916 mask = newSVpvn(WARN_ALLstring, WARNsize) ;
1917 }
1918 }
e476b1b5 1919 else
72dc9ed5 1920 mask = newSVpvn((char *) (old_warnings + 1), old_warnings[0]);
6e449a3a 1921 mPUSHs(mask);
e476b1b5 1922 }
b3ca2e83 1923
c28fe1ec 1924 PUSHs(cx->blk_oldcop->cop_hints_hash ?
20439bc7 1925 sv_2mortal(newRV_noinc(MUTABLE_SV(cop_hints_2hv(cx->blk_oldcop, 0))))
b3ca2e83 1926 : &PL_sv_undef);
a0d0e21e
LW
1927 RETURN;
1928}
1929
a0d0e21e
LW
1930PP(pp_reset)
1931{
39644a26 1932 dSP;
ca826051
FC
1933 const char * tmps;
1934 STRLEN len = 0;
1935 if (MAXARG < 1 || (!TOPs && !POPs))
1936 tmps = NULL, len = 0;
1937 else
1938 tmps = SvPVx_const(POPs, len);
1939 sv_resetpvn(tmps, len, CopSTASH(PL_curcop));
3280af22 1940 PUSHs(&PL_sv_yes);
a0d0e21e
LW
1941 RETURN;
1942}
1943
dd2155a4
DM
1944/* like pp_nextstate, but used instead when the debugger is active */
1945
a0d0e21e
LW
1946PP(pp_dbstate)
1947{
533c011a 1948 PL_curcop = (COP*)PL_op;
a0d0e21e 1949 TAINT_NOT; /* Each statement is presumed innocent */
3280af22 1950 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e
LW
1951 FREETMPS;
1952
f410a211
NC
1953 PERL_ASYNC_CHECK();
1954
88df5f01 1955 if (PL_op->op_flags & OPf_SPECIAL /* breakpoint */
a6d69523 1956 || PL_DBsingle_iv || PL_DBsignal_iv || PL_DBtrace_iv)
a0d0e21e 1957 {
39644a26 1958 dSP;
eb578fdb 1959 PERL_CONTEXT *cx;
f54cb97a 1960 const I32 gimme = G_ARRAY;
0bd48802 1961 GV * const gv = PL_DBgv;
432d4561
JL
1962 CV * cv = NULL;
1963
1964 if (gv && isGV_with_GP(gv))
1965 cv = GvCV(gv);
a0d0e21e 1966
c2cb6f77 1967 if (!cv || (!CvROOT(cv) && !CvXSUB(cv)))
cea2e8a9 1968 DIE(aTHX_ "No DB::DB routine defined");
a0d0e21e 1969
aea4f609
DM
1970 if (CvDEPTH(cv) >= 1 && !(PL_debug & DEBUG_DB_RECURSE_FLAG))
1971 /* don't do recursive DB::DB call */
a0d0e21e 1972 return NORMAL;
748a9306 1973
aed2304a 1974 if (CvISXSUB(cv)) {
8ae997c5
DM
1975 ENTER;
1976 SAVEI32(PL_debug);
1977 PL_debug = 0;
1978 SAVESTACK_POS();
8a44b450 1979 SAVETMPS;
c127bd3a
SF
1980 PUSHMARK(SP);
1981 (void)(*CvXSUB(cv))(aTHX_ cv);
c127bd3a 1982 FREETMPS;
a57c6685 1983 LEAVE;
c127bd3a
SF
1984 return NORMAL;
1985 }
1986 else {
8ae997c5 1987 U8 hasargs = 0;
c127bd3a
SF
1988 PUSHBLOCK(cx, CXt_SUB, SP);
1989 PUSHSUB_DB(cx);
1990 cx->blk_sub.retop = PL_op->op_next;
bb3300d1 1991 cx->cx_u.cx_blk.blku_old_savestack_ix = PL_savestack_ix;
8ae997c5
DM
1992
1993 SAVEI32(PL_debug);
1994 PL_debug = 0;
1995 SAVESTACK_POS();
c127bd3a 1996 CvDEPTH(cv)++;
9d976ff5
FC
1997 if (CvDEPTH(cv) >= 2) {
1998 PERL_STACK_OVERFLOW_CHECK();
1999 pad_push(CvPADLIST(cv), CvDEPTH(cv));
2000 }
9d976ff5 2001 PAD_SET_CUR_NOSAVE(CvPADLIST(cv), CvDEPTH(cv));
c127bd3a
SF
2002 RETURNOP(CvSTART(cv));
2003 }
a0d0e21e
LW
2004 }
2005 else
2006 return NORMAL;
2007}
2008
2fc507dc 2009/* S_leave_common: Common code that many functions in this file use on
e5ce4d8a 2010 scope exit.
2fc507dc 2011
3089a108
DM
2012 Process the return args on the stack in the range (mark+1..sp) based on
2013 context, with any final args starting at newsp+1. Returns the new
2014 top-of-stack position
e5ce4d8a 2015 Args are mortal copied (or mortalied if lvalue) unless its safe to use
5b838094
DM
2016 as-is, based on whether it has the specified flags. Note that most
2017 callers specify flags as (SVs_PADTMP|SVs_TEMP), while leaveeval skips
2018 SVs_PADTMP since its optree gets immediately freed, freeing its padtmps
2019 at the same time.
2fc507dc
FC
2020
2021 Also, taintedness is cleared.
2022*/
2ec7f6f2 2023
b9d76716 2024STATIC SV **
2fc507dc 2025S_leave_common(pTHX_ SV **newsp, SV **sp, SV **mark, I32 gimme,
2ec7f6f2 2026 U32 flags, bool lvalue)
b9d76716 2027{
2fc507dc 2028 PERL_ARGS_ASSERT_LEAVE_COMMON;
b9d76716 2029
80dd201b 2030 TAINT_NOT;
b9d76716
VP
2031 if (gimme == G_SCALAR) {
2032 if (MARK < SP)
e5ce4d8a 2033 *++newsp = (SvFLAGS(*SP) & flags)
2ec7f6f2
FC
2034 ? *SP
2035 : lvalue
2036 ? sv_2mortal(SvREFCNT_inc_simple_NN(*SP))
2037 : sv_mortalcopy(*SP);
b9d76716
VP
2038 else {
2039 /* MEXTEND() only updates MARK, so reuse it instead of newsp. */
2040 MARK = newsp;
2041 MEXTEND(MARK, 1);
2042 *++MARK = &PL_sv_undef;
2043 return MARK;
2044 }
2045 }
2046 else if (gimme == G_ARRAY) {
2047 /* in case LEAVE wipes old return values */
2048 while (++MARK <= SP) {
e5ce4d8a 2049 if (SvFLAGS(*MARK) & flags)
b9d76716
VP
2050 *++newsp = *MARK;
2051 else {
2ec7f6f2
FC
2052 *++newsp = lvalue
2053 ? sv_2mortal(SvREFCNT_inc_simple_NN(*MARK))
2054 : sv_mortalcopy(*MARK);
b9d76716
VP
2055 TAINT_NOT; /* Each item is independent */
2056 }
2057 }
2058 /* When this function was called with MARK == newsp, we reach this
2059 * point with SP == newsp. */
2060 }
2061
2062 return newsp;
2063}
2064
2b9a6457
VP
2065PP(pp_enter)
2066{
20b7effb 2067 dSP;
eb578fdb 2068 PERL_CONTEXT *cx;
7c2d9d03 2069 I32 gimme = GIMME_V;
2b9a6457 2070
2b9a6457 2071 PUSHBLOCK(cx, CXt_BLOCK, SP);
c5369ccc 2072 PUSHBASICBLK(cx);
2b9a6457
VP
2073
2074 RETURN;
2075}
2076
2077PP(pp_leave)
2078{
20b7effb 2079 dSP;
eb578fdb 2080 PERL_CONTEXT *cx;
2b9a6457
VP
2081 SV **newsp;
2082 PMOP *newpm;
2083 I32 gimme;
2084
2085 if (PL_op->op_flags & OPf_SPECIAL) {
2086 cx = &cxstack[cxstack_ix];
2087 cx->blk_oldpm = PL_curpm; /* fake block should preserve $1 et al */
2088 }
2089
61d3b95a
DM
2090 cx = &cxstack[cxstack_ix];
2091 assert(CxTYPE(cx) == CXt_BLOCK);
2092 newsp = PL_stack_base + cx->blk_oldsp;
2093 gimme = cx->blk_gimme;
2b9a6457 2094
d37a3c64
DM
2095 SP = (gimme == G_VOID)
2096 ? newsp
2097 : leave_common(newsp, SP, newsp, gimme, SVs_PADTMP|SVs_TEMP,
2098 PL_op->op_private & OPpLVALUE);
67f63db7 2099
61d3b95a 2100 POPBLOCK(cx,newpm);
c5369ccc 2101 POPBASICBLK(cx);
2b9a6457 2102
f5319de9 2103 PL_curpm = newpm; /* Don't pop $1 et al till now */
2b9a6457
VP
2104
2105 RETURN;
2106}
2107
eaa9f768
JH
2108static bool
2109S_outside_integer(pTHX_ SV *sv)
2110{
2111 if (SvOK(sv)) {
2112 const NV nv = SvNV_nomg(sv);
415b66b2
JH
2113 if (Perl_isinfnan(nv))
2114 return TRUE;
eaa9f768
JH
2115#ifdef NV_PRESERVES_UV
2116 if (nv < (NV)IV_MIN || nv > (NV)IV_MAX)
2117 return TRUE;
2118#else
2119 if (nv <= (NV)IV_MIN)
2120 return TRUE;
2121 if ((nv > 0) &&
2122 ((nv > (NV)UV_MAX ||
2123 SvUV_nomg(sv) > (UV)IV_MAX)))
2124 return TRUE;
2125#endif
2126 }
2127 return FALSE;
2128}
2129
a0d0e21e
LW
2130PP(pp_enteriter)
2131{
20b7effb 2132 dSP; dMARK;
eb578fdb 2133 PERL_CONTEXT *cx;
f54cb97a 2134 const I32 gimme = GIMME_V;
4ad63d70 2135 void *itervarp; /* GV or pad slot of the iteration variable */
f0bb9bf7 2136 SV *itersave; /* the old var in the iterator var slot */
840fe433 2137 U8 cxtype = CXt_LOOP_FOR;
a0d0e21e 2138
aafca525 2139 if (PL_op->op_targ) { /* "my" variable */
4ad63d70
DM
2140 itervarp = &PAD_SVl(PL_op->op_targ);
2141 itersave = *(SV**)itervarp;
2142 assert(itersave);
aafca525 2143 if (PL_op->op_private & OPpLVAL_INTRO) { /* for my $x (...) */
fdb8b82b
DM
2144 /* the SV currently in the pad slot is never live during
2145 * iteration (the slot is always aliased to one of the items)
2146 * so it's always stale */
4ad63d70 2147 SvPADSTALE_on(itersave);
14f338dc 2148 }
4ad63d70 2149 SvREFCNT_inc_simple_void_NN(itersave);
9af0df0b 2150 cxtype |= CXp_FOR_PAD;
54b9620d 2151 }
d39c26a6
FC
2152 else {
2153 SV * const sv = POPs;
4ad63d70 2154 itervarp = (void *)sv;
d4e2b4d6
DM
2155 if (LIKELY(isGV(sv))) { /* symbol table variable */
2156 SV** svp = &GvSV(sv);
2157 itersave = *svp;
2158 if (LIKELY(itersave))
2159 SvREFCNT_inc_simple_void_NN(itersave);
2160 else
2161 *svp = newSV(0);
2162 cxtype |= CXp_FOR_GV;
2163 }
2164 else { /* LV ref: for \$foo (...) */
2165 assert(SvTYPE(sv) == SVt_PVMG);
2166 assert(SvMAGIC(sv));
2167 assert(SvMAGIC(sv)->mg_type == PERL_MAGIC_lvref);
2168 itersave = NULL;
2169 cxtype |= CXp_FOR_LVREF;
2170 }
d39c26a6 2171 }
4633a7c4 2172
0d863452
RH
2173 if (PL_op->op_private & OPpITER_DEF)
2174 cxtype |= CXp_FOR_DEF;
2175
7766f137 2176 PUSHBLOCK(cx, cxtype, SP);
4ad63d70 2177 PUSHLOOP_FOR(cx, itervarp, itersave, MARK);
533c011a 2178 if (PL_op->op_flags & OPf_STACKED) {
d01136d6
BS
2179 SV *maybe_ary = POPs;
2180 if (SvTYPE(maybe_ary) != SVt_PVAV) {
89ea2908 2181 dPOPss;
d01136d6 2182 SV * const right = maybe_ary;
d39c26a6
FC
2183 if (UNLIKELY(cxtype & CXp_FOR_LVREF))
2184 DIE(aTHX_ "Assigned value is not a reference");
984a4bea
RD
2185 SvGETMAGIC(sv);
2186 SvGETMAGIC(right);
4fe3f0fa 2187 if (RANGE_IS_NUMERIC(sv,right)) {
d01136d6 2188 cx->cx_type &= ~CXTYPEMASK;
c6fdafd0
NC
2189 cx->cx_type |= CXt_LOOP_LAZYIV;
2190 /* Make sure that no-one re-orders cop.h and breaks our
2191 assumptions */
2192 assert(CxTYPE(cx) == CXt_LOOP_LAZYIV);
eaa9f768
JH
2193 if (S_outside_integer(aTHX_ sv) ||
2194 S_outside_integer(aTHX_ right))
076d9a11 2195 DIE(aTHX_ "Range iterator outside integer range");
f52e41ad
FC
2196 cx->blk_loop.state_u.lazyiv.cur = SvIV_nomg(sv);
2197 cx->blk_loop.state_u.lazyiv.end = SvIV_nomg(right);
d4665a05
DM
2198#ifdef DEBUGGING
2199 /* for correct -Dstv display */
2200 cx->blk_oldsp = sp - PL_stack_base;
2201#endif
89ea2908 2202 }
3f63a782 2203 else {
d01136d6
BS
2204 cx->cx_type &= ~CXTYPEMASK;
2205 cx->cx_type |= CXt_LOOP_LAZYSV;
2206 /* Make sure that no-one re-orders cop.h and breaks our
2207 assumptions */
2208 assert(CxTYPE(cx) == CXt_LOOP_LAZYSV);
2209 cx->blk_loop.state_u.lazysv.cur = newSVsv(sv);
2210 cx->blk_loop.state_u.lazysv.end = right;
2211 SvREFCNT_inc(right);
2212 (void) SvPV_force_nolen(cx->blk_loop.state_u.lazysv.cur);
267cc4a8
NC
2213 /* This will do the upgrade to SVt_PV, and warn if the value
2214 is uninitialised. */
10516c54 2215 (void) SvPV_nolen_const(right);
267cc4a8
NC
2216 /* Doing this avoids a check every time in pp_iter in pp_hot.c
2217 to replace !SvOK() with a pointer to "". */
2218 if (!SvOK(right)) {
2219 SvREFCNT_dec(right);
d01136d6 2220 cx->blk_loop.state_u.lazysv.end = &PL_sv_no;
267cc4a8 2221 }
3f63a782 2222 }
89ea2908 2223 }
d01136d6 2224 else /* SvTYPE(maybe_ary) == SVt_PVAV */ {
502c6561 2225 cx->blk_loop.state_u.ary.ary = MUTABLE_AV(maybe_ary);
d01136d6
BS
2226 SvREFCNT_inc(maybe_ary);
2227 cx->blk_loop.state_u.ary.ix =
2228 (PL_op->op_private & OPpITER_REVERSED) ?
2229 AvFILL(cx->blk_loop.state_u.ary.ary) + 1 :
2230 -1;
ef3e5ea9 2231 }
89ea2908 2232 }
d01136d6
BS
2233 else { /* iterating over items on the stack */
2234 cx->blk_loop.state_u.ary.ary = NULL; /* means to use the stack */
ef3e5ea9 2235 if (PL_op->op_private & OPpITER_REVERSED) {
d01136d6 2236 cx->blk_loop.state_u.ary.ix = cx->blk_oldsp + 1;
ef3e5ea9
NC
2237 }
2238 else {
d01136d6 2239 cx->blk_loop.state_u.ary.ix = MARK - PL_stack_base;
ef3e5ea9 2240 }
4633a7c4 2241 }
a0d0e21e
LW
2242
2243 RETURN;
2244}
2245
2246PP(pp_enterloop)
2247{
20b7effb 2248 dSP;
eb578fdb 2249 PERL_CONTEXT *cx;
f54cb97a 2250 const I32 gimme = GIMME_V;
a0d0e21e 2251
3b719c58
NC
2252 PUSHBLOCK(cx, CXt_LOOP_PLAIN, SP);
2253 PUSHLOOP_PLAIN(cx, SP);
a0d0e21e
LW
2254
2255 RETURN;
2256}
2257
2258PP(pp_leaveloop)
2259{
20b7effb 2260 dSP;
eb578fdb 2261 PERL_CONTEXT *cx;
a0d0e21e
LW
2262 I32 gimme;
2263 SV **newsp;
2264 PMOP *newpm;
2265 SV **mark;
2266
61d3b95a 2267 cx = &cxstack[cxstack_ix];
3b719c58 2268 assert(CxTYPE_is_LOOP(cx));
61d3b95a 2269 mark = PL_stack_base + cx->blk_oldsp;
a8bba7fa 2270 newsp = PL_stack_base + cx->blk_loop.resetsp;
61d3b95a 2271 gimme = cx->blk_gimme;
f86702cc 2272
d37a3c64
DM
2273 SP = (gimme == G_VOID)
2274 ? newsp
5b838094 2275 : leave_common(newsp, SP, MARK, gimme, SVs_PADTMP|SVs_TEMP,
a373464f 2276 PL_op->op_private & OPpLVALUE);
f86702cc
PP
2277 PUTBACK;
2278
61d3b95a 2279 POPBLOCK(cx,newpm);
a8bba7fa 2280 POPLOOP(cx); /* Stack values are safe: release loop vars ... */
3280af22 2281 PL_curpm = newpm; /* ... and pop $1 et al */
f86702cc 2282
f86702cc 2283 return NORMAL;
a0d0e21e
LW
2284}
2285
31ccb4f5
DM
2286
2287/* This duplicates most of pp_leavesub, but with additional code to handle
2288 * return args in lvalue context. It was forked from pp_leavesub to
2289 * avoid slowing down that function any further.
2290 *
2291 * Any changes made to this function may need to be copied to pp_leavesub
2292 * and vice-versa.
57486a97
DM
2293 */
2294
31ccb4f5 2295PP(pp_leavesublv)
3bdf583b 2296{
57486a97
DM
2297 dSP;
2298 SV **newsp;
2299 SV **mark;
2300 PMOP *newpm;
2301 I32 gimme;
2302 PERL_CONTEXT *cx;
57486a97 2303 bool ref;
a8fc6464 2304 const char *what = NULL;
57486a97 2305
61d3b95a
DM
2306 cx = &cxstack[cxstack_ix];
2307 assert(CxTYPE(cx) == CXt_SUB);
2308
2309 if (CxMULTICALL(cx)) {
1f0ba93b
DM
2310 /* entry zero of a stack is always PL_sv_undef, which
2311 * simplifies converting a '()' return into undef in scalar context */
2312 assert(PL_stack_sp > PL_stack_base || *PL_stack_base == &PL_sv_undef);
85ecf147 2313 return 0;
1f0ba93b 2314 }
85ecf147 2315
61d3b95a
DM
2316 newsp = PL_stack_base + cx->blk_oldsp;
2317 gimme = cx->blk_gimme;
57486a97
DM
2318 TAINT_NOT;
2319
e80c4acf 2320 mark = newsp + 1;
57486a97
DM
2321
2322 ref = !!(CxLVAL(cx) & OPpENTERSUB_INARGS);
3bdf583b 2323 if (gimme == G_SCALAR) {
d25b0d7b 2324 if (CxLVAL(cx) && !ref) { /* Leave it as it is if we can. */
e80c4acf 2325 if (MARK <= SP) {
3885a45a 2326 if ((SvPADTMP(TOPs) || SvREADONLY(TOPs)) &&
d25b0d7b 2327 !SvSMAGICAL(TOPs)) {
001de122 2328 what =
d25b0d7b 2329 SvREADONLY(TOPs) ? (TOPs == &PL_sv_undef) ? "undef"
001de122 2330 : "a readonly value" : "a temporary";
d25b0d7b 2331 }
001de122 2332 else goto copy_sv;
d25b0d7b
FC
2333 }
2334 else {
2335 /* sub:lvalue{} will take us here. */
001de122 2336 what = "undef";
d25b0d7b 2337 }
a8fc6464 2338 croak:
88c90157 2339 POPSUB(cx);
716436dc 2340 cxstack_ix--;
61d3b95a 2341 PL_curpm = cx->blk_oldpm;
001de122
FC
2342 Perl_croak(aTHX_
2343 "Can't return %s from lvalue subroutine", what
2344 );
d25b0d7b 2345 }
e80c4acf 2346 if (MARK <= SP) {
a5ad7a5a 2347 copy_sv:
3bdf583b 2348 if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
5811c07e 2349 if (!SvPADTMP(*SP)) {
e80c4acf 2350 *MARK = SvREFCNT_inc(*SP);
3bdf583b 2351 FREETMPS;
e80c4acf 2352 sv_2mortal(*MARK);
5811c07e
FC
2353 }
2354 else {
2355 /* FREETMPS could clobber it */
2356 SV *sv = SvREFCNT_inc(*SP);
2357 FREETMPS;
e80c4acf 2358 *MARK = sv_mortalcopy(sv);
5811c07e
FC
2359 SvREFCNT_dec(sv);
2360 }
3bdf583b
FC
2361 }
2362 else
e80c4acf 2363 *MARK =
5811c07e
FC
2364 SvPADTMP(*SP)
2365 ? sv_mortalcopy(*SP)
2366 : !SvTEMP(*SP)
e08be60b
FC
2367 ? sv_2mortal(SvREFCNT_inc_simple_NN(*SP))
2368 : *SP;
3bdf583b 2369 }
0d235c77 2370 else {
e80c4acf
DM
2371 MEXTEND(MARK, 0);
2372 *MARK = &PL_sv_undef;
0d235c77 2373 }
e80c4acf
DM
2374 SP = MARK;
2375
0e9700df 2376 if (CxLVAL(cx) & OPpDEREF) {
767eda44
FC
2377 SvGETMAGIC(TOPs);
2378 if (!SvOK(TOPs)) {
0e9700df 2379 TOPs = vivify_ref(TOPs, CxLVAL(cx) & OPpDEREF);
767eda44
FC
2380 }
2381 }
3bdf583b
FC
2382 }
2383 else if (gimme == G_ARRAY) {
0e9700df 2384 assert (!(CxLVAL(cx) & OPpDEREF));
80422e24 2385 if (ref || !CxLVAL(cx))
e80c4acf
DM
2386 for (; MARK <= SP; MARK++)
2387 *MARK =
5811c07e 2388 SvFLAGS(*MARK) & SVs_PADTMP
80422e24 2389 ? sv_mortalcopy(*MARK)
5811c07e
FC
2390 : SvTEMP(*MARK)
2391 ? *MARK
80422e24 2392 : sv_2mortal(SvREFCNT_inc_simple_NN(*MARK));
e80c4acf 2393 else for (; MARK <= SP; MARK++) {
d25b0d7b 2394 if (*MARK != &PL_sv_undef
3885a45a 2395 && (SvPADTMP(*MARK) || SvREADONLY(*MARK))
d25b0d7b 2396 ) {
d25b0d7b 2397 /* Might be flattened array after $#array = */
a8fc6464
DM
2398 what = SvREADONLY(*MARK)
2399 ? "a readonly value" : "a temporary";
2400 goto croak;
d25b0d7b 2401 }
e80c4acf
DM
2402 else if (!SvTEMP(*MARK))
2403 *MARK = sv_2mortal(SvREFCNT_inc_simple_NN(*MARK));
3bdf583b
FC
2404 }
2405 }
e80c4acf 2406 PUTBACK;
57486a97 2407
61d3b95a
DM
2408 POPBLOCK(cx,newpm);
2409 cxstack_ix++; /* preserve cx entry on stack for use by POPSUB */
88c90157 2410 POPSUB(cx); /* Stack values are safe: release CV and @_ ... */
716436dc 2411 cxstack_ix--;
57486a97 2412 PL_curpm = newpm; /* ... and pop $1 et al */
57486a97
DM
2413
2414 return cx->blk_sub.retop;
3bdf583b
FC
2415}
2416
57486a97 2417
a0d0e21e
LW
2418PP(pp_return)
2419{
20b7effb 2420 dSP; dMARK;
eb578fdb 2421 PERL_CONTEXT *cx;
0bd48802
AL
2422 const I32 cxix = dopoptosub(cxstack_ix);
2423
d40dc6b1
DM
2424 assert(cxstack_ix >= 0);
2425 if (cxix < cxstack_ix) {
2426 if (cxix < 0) {
3089a108
DM
2427 if (!CxMULTICALL(cxstack))
2428 DIE(aTHX_ "Can't return outside a subroutine");
2429 /* We must be in a sort block, which is a CXt_NULL not a
2430 * CXt_SUB. Handle specially. */
2431 if (cxstack_ix > 0) {
2432 /* See comment below about context popping. Since we know
2433 * we're scalar and not lvalue, we can preserve the return
2434 * value in a simpler fashion than there. */
2435 SV *sv = *SP;
d40dc6b1 2436 assert(cxstack[0].blk_gimme == G_SCALAR);
3089a108
DM
2437 if ( (sp != PL_stack_base)
2438 && !(SvFLAGS(sv) & (SVs_TEMP|SVs_PADTMP))
2439 )
2440 *SP = sv_mortalcopy(sv);
2441 dounwind(0);
d40dc6b1 2442 }
3089a108
DM
2443 /* caller responsible for popping cxstack[0] */
2444 return 0;
d40dc6b1 2445 }
3089a108
DM
2446
2447 /* There are contexts that need popping. Doing this may free the
2448 * return value(s), so preserve them first, e.g. popping the plain
2449 * loop here would free $x:
2450 * sub f { { my $x = 1; return $x } }
2451 * We may also need to shift the args down; for example,
2452 * for (1,2) { return 3,4 }
2453 * leaves 1,2,3,4 on the stack. Both these actions can be done by
2454 * leave_common(). By calling it with lvalue=TRUE, we just bump
2455 * the ref count and mortalise the args that need it. The "scan
2456 * the args and maybe copy them" process will be repeated by
2457 * whoever we tail-call (e.g. pp_leaveeval), where any copying etc
2458 * will be done. That is to say, in this code path two scans of
2459 * the args will be done; the first just shifts and preserves; the
2460 * second is the "real" arg processing, based on the type of
2461 * return.
2462 */
2463 cx = &cxstack[cxix];
2464 SP = leave_common(PL_stack_base + cx->blk_oldsp, SP, MARK,
2465 cx->blk_gimme, SVs_TEMP|SVs_PADTMP, TRUE);
2466 PUTBACK;
a0d0e21e 2467 dounwind(cxix);
d40dc6b1 2468 }
3089a108
DM
2469 else {
2470 /* Like in the branch above, we need to handle any extra junk on
2471 * the stack. But because we're not also popping extra contexts, we
2472 * don't have to worry about prematurely freeing args. So we just
2473 * need to do the bare minimum to handle junk, and leave the main
2474 * arg processing in the function we tail call, e.g. pp_leavesub.
2475 * In list context we have to splice out the junk; in scalar
2476 * context we can leave as-is (pp_leavesub will later return the
2477 * top stack element). But for an empty arg list, e.g.
2478 * for (1,2) { return }
2479 * we need to set sp = oldsp so that pp_leavesub knows to push
2480 * &PL_sv_undef onto the stack.
2481 */
3ebe7c5a
DM
2482 SV **oldsp;
2483 cx = &cxstack[cxix];
2484 oldsp = PL_stack_base + cx->blk_oldsp;
2485 if (oldsp != MARK) {
2486 SSize_t nargs = SP - MARK;
2487 if (nargs) {
2488 if (cx->blk_gimme == G_ARRAY) {
2489 /* shift return args to base of call stack frame */
2490 Move(MARK + 1, oldsp + 1, nargs, SV*);
2491 PL_stack_sp = oldsp + nargs;
2492 }
6228a1e1 2493 }
3ebe7c5a
DM
2494 else
2495 PL_stack_sp = oldsp;
13929c4c 2496 }
3089a108 2497 }
617a4f41
DM
2498
2499 /* fall through to a normal exit */
2500 switch (CxTYPE(cx)) {
2501 case CXt_EVAL:
2502 return CxTRYBLOCK(cx)
2503 ? Perl_pp_leavetry(aTHX)
2504 : Perl_pp_leaveeval(aTHX);
2505 case CXt_SUB:
13929c4c 2506 return CvLVALUE(cx->blk_sub.cv)
31ccb4f5 2507 ? Perl_pp_leavesublv(aTHX)
13929c4c 2508 : Perl_pp_leavesub(aTHX);
7766f137 2509 case CXt_FORMAT:
617a4f41 2510 return Perl_pp_leavewrite(aTHX);
a0d0e21e 2511 default:
5637ef5b 2512 DIE(aTHX_ "panic: return, type=%u", (unsigned) CxTYPE(cx));
a0d0e21e 2513 }
a0d0e21e
LW
2514}
2515
4f443c3d 2516
1f039d60
FC
2517static I32
2518S_unwind_loop(pTHX_ const char * const opname)
a0d0e21e 2519{
a0d0e21e 2520 I32 cxix;
1f039d60
FC
2521 if (PL_op->op_flags & OPf_SPECIAL) {
2522 cxix = dopoptoloop(cxstack_ix);
2523 if (cxix < 0)
2524 /* diag_listed_as: Can't "last" outside a loop block */
2525 Perl_croak(aTHX_ "Can't \"%s\" outside a loop block", opname);
2526 }
2527 else {
2528 dSP;
2529 STRLEN label_len;
2530 const char * const label =
2531 PL_op->op_flags & OPf_STACKED
2532 ? SvPV(TOPs,label_len)
2533 : (label_len = strlen(cPVOP->op_pv), cPVOP->op_pv);
2534 const U32 label_flags =
2535 PL_op->op_flags & OPf_STACKED
2536 ? SvUTF8(POPs)
2537 : (cPVOP->op_private & OPpPV_IS_UTF8) ? SVf_UTF8 : 0;
2538 PUTBACK;
2539 cxix = dopoptolabel(label, label_len, label_flags);
2540 if (cxix < 0)
2541 /* diag_listed_as: Label not found for "last %s" */
2542 Perl_croak(aTHX_ "Label not found for \"%s %"SVf"\"",
2543 opname,
2544 SVfARG(PL_op->op_flags & OPf_STACKED
2545 && !SvGMAGICAL(TOPp1s)
2546 ? TOPp1s
2547 : newSVpvn_flags(label,
2548 label_len,
2549 label_flags | SVs_TEMP)));
2550 }
2551 if (cxix < cxstack_ix)
2552 dounwind(cxix);
2553 return cxix;
2554}
2555
2556PP(pp_last)
2557{
eb578fdb 2558 PERL_CONTEXT *cx;
b263a1ad 2559 OP *nextop = NULL;
a0d0e21e 2560 PMOP *newpm;
9d4ba2ae 2561
1f039d60 2562 S_unwind_loop(aTHX_ "last");
a0d0e21e
LW
2563
2564 POPBLOCK(cx,newpm);
5dd42e15 2565 cxstack_ix++; /* temporarily protect top context */
d3e5e568
DM
2566 assert(
2567 CxTYPE(cx) == CXt_LOOP_LAZYIV
2568 || CxTYPE(cx) == CXt_LOOP_LAZYSV
2569 || CxTYPE(cx) == CXt_LOOP_FOR
2570 || CxTYPE(cx) == CXt_LOOP_PLAIN
2571 );
f7d0774b 2572 PL_stack_sp = PL_stack_base + cx->blk_loop.resetsp;
d3e5e568 2573 nextop = cx->blk_loop.my_op->op_lastop->op_next;
a0d0e21e 2574
a1f49e72 2575 TAINT_NOT;
f86702cc 2576
5dd42e15 2577 cxstack_ix--;
f86702cc 2578 /* Stack values are safe: */
d3e5e568 2579 POPLOOP(cx); /* release loop vars ... */
3280af22 2580 PL_curpm = newpm; /* ... and pop $1 et al */
a0d0e21e 2581
f86702cc 2582 return nextop;
a0d0e21e
LW
2583}
2584
2585PP(pp_next)
2586{
eb578fdb 2587 PERL_CONTEXT *cx;
a0d0e21e 2588
1f039d60 2589 S_unwind_loop(aTHX_ "next");
a0d0e21e 2590
1ba6ee2b 2591 TOPBLOCK(cx);
3a1b2b9e 2592 PL_curcop = cx->blk_oldcop;
47c9d59f 2593 PERL_ASYNC_CHECK();
d57ce4df 2594 return (cx)->blk_loop.my_op->op_nextop;
a0d0e21e
LW
2595}
2596
2597PP(pp_redo)
2598{
1f039d60 2599 const I32 cxix = S_unwind_loop(aTHX_ "redo");
eb578fdb 2600 PERL_CONTEXT *cx;
1f039d60 2601 OP* redo_op = cxstack[cxix].blk_loop.my_op->op_redoop;
a0d0e21e 2602
a034e688
DM
2603 if (redo_op->op_type == OP_ENTER) {
2604 /* pop one less context to avoid $x being freed in while (my $x..) */
2605 cxstack_ix++;
2606 assert(CxTYPE(&cxstack[cxstack_ix]) == CXt_BLOCK);
2607 redo_op = redo_op->op_next;
2608 }
2609
a0d0e21e 2610 TOPBLOCK(cx);
dfe0f39b 2611 CX_LEAVE_SCOPE(cx);
936c78b5 2612 FREETMPS;
3a1b2b9e 2613 PL_curcop = cx->blk_oldcop;
47c9d59f 2614 PERL_ASYNC_CHECK();
a034e688 2615 return redo_op;
a0d0e21e
LW
2616}
2617
0824fdcb 2618STATIC OP *
5db1eb8d 2619S_dofindlabel(pTHX_ OP *o, const char *label, STRLEN len, U32 flags, OP **opstack, OP **oplimit)
a0d0e21e 2620{
a0d0e21e 2621 OP **ops = opstack;
a1894d81 2622 static const char* const too_deep = "Target of goto is too deeply nested";
a0d0e21e 2623
7918f24d
NC
2624 PERL_ARGS_ASSERT_DOFINDLABEL;
2625
fc36a67e 2626 if (ops >= oplimit)
0157ef98 2627 Perl_croak(aTHX_ "%s", too_deep);
11343788
MB
2628 if (o->op_type == OP_LEAVE ||
2629 o->op_type == OP_SCOPE ||
2630 o->op_type == OP_LEAVELOOP ||
33d34e4c 2631 o->op_type == OP_LEAVESUB ||
11343788 2632 o->op_type == OP_LEAVETRY)
fc36a67e 2633 {
5dc0d613 2634 *ops++ = cUNOPo->op_first;
fc36a67e 2635 if (ops >= oplimit)
0157ef98 2636 Perl_croak(aTHX_ "%s", too_deep);
fc36a67e 2637 }
c4aa4e48 2638 *ops = 0;
11343788 2639 if (o->op_flags & OPf_KIDS) {
aec46f14 2640 OP *kid;
a0d0e21e 2641 /* First try all the kids at this level, since that's likeliest. */
e6dae479 2642 for (kid = cUNOPo->op_first; kid; kid = OpSIBLING(kid)) {
7e8f1eac 2643 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) {
5db1eb8d
BF
2644 STRLEN kid_label_len;
2645 U32 kid_label_flags;
2646 const char *kid_label = CopLABEL_len_flags(kCOP,
2647 &kid_label_len, &kid_label_flags);
2648 if (kid_label && (
2649 ( (kid_label_flags & SVf_UTF8) != (flags & SVf_UTF8) ) ?
2650 (flags & SVf_UTF8)
2651 ? (bytes_cmp_utf8(
2652 (const U8*)kid_label, kid_label_len,
2653 (const U8*)label, len) == 0)
2654 : (bytes_cmp_utf8(
2655 (const U8*)label, len,
2656 (const U8*)kid_label, kid_label_len) == 0)
eade7155
BF
2657 : ( len == kid_label_len && ((kid_label == label)
2658 || memEQ(kid_label, label, len)))))
7e8f1eac
AD
2659 return kid;
2660 }
a0d0e21e 2661 }
e6dae479 2662 for (kid = cUNOPo->op_first; kid; kid = OpSIBLING(kid)) {
3280af22 2663 if (kid == PL_lastgotoprobe)
a0d0e21e 2664 continue;
ed8d0fe2
SM
2665 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) {
2666 if (ops == opstack)
2667 *ops++ = kid;
2668 else if (ops[-1]->op_type == OP_NEXTSTATE ||
2669 ops[-1]->op_type == OP_DBSTATE)
2670 ops[-1] = kid;
2671 else
2672 *ops++ = kid;
2673 }
5db1eb8d 2674 if ((o = dofindlabel(kid, label, len, flags, ops, oplimit)))
11343788 2675 return o;
a0d0e21e
LW
2676 }
2677 }
c4aa4e48 2678 *ops = 0;
a0d0e21e
LW
2679 return 0;
2680}
2681
b1c05ba5
DM
2682
2683/* also used for: pp_dump() */
2684
2685PP(pp_goto)
a0d0e21e 2686{
27da23d5 2687 dVAR; dSP;
cbbf8932 2688 OP *retop = NULL;
a0d0e21e 2689 I32 ix;
eb578fdb 2690 PERL_CONTEXT *cx;
fc36a67e
PP
2691#define GOTO_DEPTH 64
2692 OP *enterops[GOTO_DEPTH];
cbbf8932 2693 const char *label = NULL;
5db1eb8d
BF
2694 STRLEN label_len = 0;
2695 U32 label_flags = 0;
bfed75c6 2696 const bool do_dump = (PL_op->op_type == OP_DUMP);
a1894d81 2697 static const char* const must_have_label = "goto must have label";
a0d0e21e 2698
533c011a 2699 if (PL_op->op_flags & OPf_STACKED) {
7d1d69cb
DM
2700 /* goto EXPR or goto &foo */
2701
9d4ba2ae 2702 SV * const sv = POPs;
55b37f1c 2703 SvGETMAGIC(sv);
a0d0e21e 2704
a0d0e21e 2705 if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVCV) {
0fa3d31d 2706 /* This egregious kludge implements goto &subroutine */
a0d0e21e 2707 I32 cxix;
eb578fdb 2708 PERL_CONTEXT *cx;
ea726b52 2709 CV *cv = MUTABLE_CV(SvRV(sv));
049bd5ff 2710 AV *arg = GvAV(PL_defgv);
a0d0e21e 2711
5d52e310 2712 while (!CvROOT(cv) && !CvXSUB(cv)) {
7fc63493 2713 const GV * const gv = CvGV(cv);
e8f7dd13 2714 if (gv) {
7fc63493 2715 GV *autogv;
e8f7dd13
GS
2716 SV *tmpstr;
2717 /* autoloaded stub? */
2718 if (cv != GvCV(gv) && (cv = GvCV(gv)))
5d52e310 2719 continue;
c271df94
BF
2720 autogv = gv_autoload_pvn(GvSTASH(gv), GvNAME(gv),
2721 GvNAMELEN(gv),
2722 GvNAMEUTF8(gv) ? SVf_UTF8 : 0);
e8f7dd13 2723 if (autogv && (cv = GvCV(autogv)))
5d52e310 2724 continue;
e8f7dd13 2725 tmpstr = sv_newmortal();
c445ea15 2726 gv_efullname3(tmpstr, gv, NULL);
be2597df 2727 DIE(aTHX_ "Goto undefined subroutine &%"SVf"", SVfARG(tmpstr));
4aa0a1f7 2728 }
cea2e8a9 2729 DIE(aTHX_ "Goto undefined subroutine");
4aa0a1f7
AD
2730 }
2731
a0d0e21e 2732 cxix = dopoptosub(cxstack_ix);
d338c0c2
DM
2733 if (cxix < 0) {
2734 DIE(aTHX_ "Can't goto subroutine outside a subroutine");
8da3792e 2735 }
d338c0c2 2736 cx = &cxstack[cxix];
564abe23 2737 /* ban goto in eval: see <20050521150056.GC20213@iabyn.com> */
2d43a17f 2738 if (CxTYPE(cx) == CXt_EVAL) {
c74ace89 2739 if (CxREALEVAL(cx))
00455a92 2740 /* diag_listed_as: Can't goto subroutine from an eval-%s */
c74ace89
DM
2741 DIE(aTHX_ "Can't goto subroutine from an eval-string");
2742 else
00455a92 2743 /* diag_listed_as: Can't goto subroutine from an eval-%s */
c74ace89 2744 DIE(aTHX_ "Can't goto subroutine from an eval-block");
2d43a17f 2745 }
9850bf21
RH
2746 else if (CxMULTICALL(cx))
2747 DIE(aTHX_ "Can't goto subroutine from a sort sub (or similar callback)");
d338c0c2
DM
2748
2749 /* First do some returnish stuff. */
2750
2751 SvREFCNT_inc_simple_void(cv); /* avoid premature free during unwind */
2752 FREETMPS;
2753 if (cxix < cxstack_ix) {
2754 dounwind(cxix);
2755 }
2756 TOPBLOCK(cx);
2757 SPAGAIN;
39de75fd
DM
2758
2759 /* partial unrolled POPSUB(): */
2760
8ae997c5
DM
2761 /* protect @_ during save stack unwind. */
2762 if (arg)
2763 SvREFCNT_inc_NN(sv_2mortal(MUTABLE_SV(arg)));
2764
2765 assert(PL_scopestack_ix == cx->blk_oldscopesp);
dfe0f39b 2766 CX_LEAVE_SCOPE(cx);
8ae997c5 2767
bafb2adc 2768 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)) {
9513529b 2769 AV* av = MUTABLE_AV(PAD_SVl(0));
e2657e18
DM
2770 assert(AvARRAY(MUTABLE_AV(
2771 PadlistARRAY(CvPADLIST(cx->blk_sub.cv))[
2772 CvDEPTH(cx->blk_sub.cv)])) == PL_curpad);
2773
f72bdec3
DM
2774 /* we are going to donate the current @_ from the old sub
2775 * to the new sub. This first part of the donation puts a
2776 * new empty AV in the pad[0] slot of the old sub,
2777 * unless pad[0] and @_ differ (e.g. if the old sub did
2778 * local *_ = []); in which case clear the old pad[0]
2779 * array in the usual way */
95b2f486
DM
2780 if (av == arg || AvREAL(av))
2781 clear_defarray(av, av == arg);
049bd5ff 2782 else CLEAR_ARGARRAY(av);
a0d0e21e 2783 }
88c11d84 2784
b1e25d05
DM
2785 /* don't restore PL_comppad here. It won't be needed if the
2786 * sub we're going to is non-XS, but restoring it early then
2787 * croaking (e.g. the "Goto undefined subroutine" below)
2788 * means the CX block gets processed again in dounwind,
2789 * but this time with the wrong PL_comppad */
88c11d84 2790
1d59c038
FC
2791 /* A destructor called during LEAVE_SCOPE could have undefined
2792 * our precious cv. See bug #99850. */
2793 if (!CvROOT(cv) && !CvXSUB(cv)) {
2794 const GV * const gv = CvGV(cv);
2795 if (gv) {
2796 SV * const tmpstr = sv_newmortal();
2797 gv_efullname3(tmpstr, gv, NULL);
2798 DIE(aTHX_ "Goto undefined subroutine &%"SVf"",
2799 SVfARG(tmpstr));
2800 }
2801 DIE(aTHX_ "Goto undefined subroutine");
2802 }
2803
cd17cc2e
DM
2804 if (CxTYPE(cx) == CXt_SUB) {
2805 CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth;
2806 SvREFCNT_dec_NN(cx->blk_sub.cv);
2807 }
2808
a0d0e21e 2809 /* Now do some callish stuff. */
aed2304a 2810 if (CvISXSUB(cv)) {
ad39f3a2 2811 const SSize_t items = arg ? AvFILL(arg) + 1 : 0;
cd313eb4 2812 const bool m = arg ? cBOOL(SvRMAGICAL(arg)) : 0;
049bd5ff
FC
2813 SV** mark;
2814
8ae997c5 2815 ENTER;
80774f05
DM
2816 SAVETMPS;
2817 SAVEFREESV(cv); /* later, undo the 'avoid premature free' hack */
2818
049bd5ff 2819 /* put GvAV(defgv) back onto stack */
8c9d3376
FC
2820 if (items) {
2821 EXTEND(SP, items+1); /* @_ could have been extended. */
8c9d3376 2822 }
049bd5ff 2823 mark = SP;
ad39f3a2 2824 if (items) {
de935cc9 2825 SSize_t index;
ad39f3a2 2826 bool r = cBOOL(AvREAL(arg));
b1464ded 2827 for (index=0; index<items; index++)
ad39f3a2
FC
2828 {
2829 SV *sv;
2830 if (m) {
2831 SV ** const svp = av_fetch(arg, index, 0);
2832 sv = svp ? *svp : NULL;
dd2a7f90 2833 }
ad39f3a2
FC
2834 else sv = AvARRAY(arg)[index];
2835 SP[index+1] = sv
2836 ? r ? SvREFCNT_inc_NN(sv_2mortal(sv)) : sv
2837 : sv_2mortal(newSVavdefelem(arg, index, 1));
2838 }
049bd5ff 2839 }
ad39f3a2 2840 SP += items;
049bd5ff
FC
2841 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)) {
2842 /* Restore old @_ */
fad386cb 2843 POP_SAVEARRAY();
b1464ded 2844 }
1fa4e549 2845
51eb35b5 2846 retop = cx->blk_sub.retop;
b1e25d05
DM
2847 PL_comppad = cx->blk_sub.prevcomppad;
2848 PL_curpad = LIKELY(PL_comppad) ? AvARRAY(PL_comppad) : NULL;
8ae997c5
DM
2849
2850 /* XS subs don't have a CXt_SUB, so pop it;
2851 * this is a POPBLOCK(), less all the stuff we already did
2852 * for TOPBLOCK() earlier */
2853 PL_curcop = cx->blk_oldcop;
2854 cxstack_ix--;
2855
b37c2d43
AL
2856 /* Push a mark for the start of arglist */
2857 PUSHMARK(mark);
2858 PUTBACK;
2859 (void)(*CvXSUB(cv))(aTHX_ cv);
a57c6685 2860 LEAVE;
51eb35b5 2861 goto _return;
a0d0e21e
LW
2862 }
2863 else {
b70d5558 2864 PADLIST * const padlist = CvPADLIST(cv);
39de75fd 2865
80774f05
DM
2866 SAVEFREESV(cv); /* later, undo the 'avoid premature free' hack */
2867
39de75fd
DM
2868 /* partial unrolled PUSHSUB(): */
2869
a0d0e21e 2870 cx->blk_sub.cv = cv;
1a5b3db4 2871 cx->blk_sub.olddepth = CvDEPTH(cv);
dd2155a4 2872
a0d0e21e 2873 CvDEPTH(cv)++;
2c50b7ed
DM
2874 SvREFCNT_inc_simple_void_NN(cv);
2875 if (CvDEPTH(cv) > 1) {
2b9dff67 2876 if (CvDEPTH(cv) == PERL_SUB_DEPTH_WARN && ckWARN(WARN_RECURSION))
44a8e56a 2877 sub_crush_depth(cv);
26019298 2878 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2879 }
426a09cd 2880 PL_curcop = cx->blk_oldcop;
fd617465 2881 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
bafb2adc 2882 if (CxHASARGS(cx))
6d4ff0d2 2883 {
f72bdec3
DM
2884 /* second half of donating @_ from the old sub to the
2885 * new sub: abandon the original pad[0] AV in the
2886 * new sub, and replace it with the donated @_.
2887 * pad[0] takes ownership of the extra refcount
2888 * we gave arg earlier */
bfa371b6
FC
2889 if (arg) {
2890 SvREFCNT_dec(PAD_SVl(0));
fed4514a 2891 PAD_SVl(0) = (SV *)arg;
13122036 2892 SvREFCNT_inc_simple_void_NN(arg);
bfa371b6 2893 }
049bd5ff
FC
2894
2895 /* GvAV(PL_defgv) might have been modified on scope
f72bdec3 2896 exit, so point it at arg again. */
049bd5ff
FC
2897 if (arg != GvAV(PL_defgv)) {
2898 AV * const av = GvAV(PL_defgv);
2899 GvAV(PL_defgv) = (AV *)SvREFCNT_inc_simple(arg);
2900 SvREFCNT_dec(av);
a0d0e21e
LW
2901 }
2902 }
13122036 2903
491527d0 2904 if (PERLDB_SUB) { /* Checking curstash breaks DProf. */
005a8a35 2905 Perl_get_db_sub(aTHX_ NULL, cv);
b37c2d43 2906 if (PERLDB_GOTO) {
b96d8cd9 2907 CV * const gotocv = get_cvs("DB::goto", 0);
b37c2d43
AL
2908 if (gotocv) {
2909 PUSHMARK( PL_stack_sp );
ad64d0ec 2910 call_sv(MUTABLE_SV(gotocv), G_SCALAR | G_NODEBUG);
b37c2d43
AL
2911 PL_stack_sp--;
2912 }
491527d0 2913 }
1ce6579f 2914 }
51eb35b5
DD
2915 retop = CvSTART(cv);
2916 goto putback_return;
a0d0e21e
LW
2917 }
2918 }
1614b0e3 2919 else {
7d1d69cb 2920 /* goto EXPR */
55b37f1c 2921 label = SvPV_nomg_const(sv, label_len);
5db1eb8d 2922 label_flags = SvUTF8(sv);
1614b0e3 2923 }
a0d0e21e 2924 }
2fc690dc 2925 else if (!(PL_op->op_flags & OPf_SPECIAL)) {
7d1d69cb 2926 /* goto LABEL or dump LABEL */
5db1eb8d
BF
2927 label = cPVOP->op_pv;
2928 label_flags = (cPVOP->op_private & OPpPV_IS_UTF8) ? SVf_UTF8 : 0;
2929 label_len = strlen(label);
2930 }
0157ef98 2931 if (!(do_dump || label_len)) DIE(aTHX_ "%s", must_have_label);
a0d0e21e 2932
f410a211
NC
2933 PERL_ASYNC_CHECK();
2934
3532f34a 2935 if (label_len) {
cbbf8932 2936 OP *gotoprobe = NULL;
3b2447bc 2937 bool leaving_eval = FALSE;
33d34e4c 2938 bool in_block = FALSE;
cbbf8932 2939 PERL_CONTEXT *last_eval_cx = NULL;
a0d0e21e
LW
2940
2941 /* find label */
2942
d4c19fe8 2943 PL_lastgotoprobe = NULL;
a0d0e21e
LW
2944 *enterops = 0;
2945 for (ix = cxstack_ix; ix >= 0; ix--) {
2946 cx = &cxstack[ix];
6b35e009 2947 switch (CxTYPE(cx)) {
a0d0e21e 2948 case CXt_EVAL:
3b2447bc 2949 leaving_eval = TRUE;
971ecbe6 2950 if (!CxTRYBLOCK(cx)) {
a4f3a277
RH
2951 gotoprobe = (last_eval_cx ?
2952 last_eval_cx->blk_eval.old_eval_root :
2953 PL_eval_root);
2954 last_eval_cx = cx;
9c5794fe
RH
2955 break;
2956 }
2957 /* else fall through */
c6fdafd0 2958 case CXt_LOOP_LAZYIV:
d01136d6 2959 case CXt_LOOP_LAZYSV:
3b719c58
NC
2960 case CXt_LOOP_FOR:
2961 case CXt_LOOP_PLAIN:
bb5aedc1
VP
2962 case CXt_GIVEN:
2963 case CXt_WHEN:
e6dae479 2964 gotoprobe = OpSIBLING(cx->blk_oldcop);
a0d0e21e
LW
2965 break;
2966 case CXt_SUBST:
2967 continue;
2968 case CXt_BLOCK:
33d34e4c 2969 if (ix) {
e6dae479 2970 gotoprobe = OpSIBLING(cx->blk_oldcop);
33d34e4c
AE
2971 in_block = TRUE;
2972 } else
3280af22 2973 gotoprobe = PL_main_root;
a0d0e21e 2974 break;
b3933176 2975 case CXt_SUB:
9850bf21 2976 if (CvDEPTH(cx->blk_sub.cv) && !CxMULTICALL(cx)) {
b3933176
CS
2977 gotoprobe = CvROOT(cx->blk_sub.cv);
2978 break;
2979 }
924ba076 2980 /* FALLTHROUGH */
7766f137 2981 case CXt_FORMAT:
0a753a76 2982 case CXt_NULL:
a651a37d 2983 DIE(aTHX_ "Can't \"goto\" out of a pseudo block");
a0d0e21e
LW
2984 default:
2985 if (ix)
5637ef5b
NC
2986 DIE(aTHX_ "panic: goto, type=%u, ix=%ld",
2987 CxTYPE(cx), (long) ix);
3280af22 2988 gotoprobe = PL_main_root;
a0d0e21e
LW
2989 break;
2990 }
2b597662 2991 if (gotoprobe) {
29e61fd9
DM
2992 OP *sibl1, *sibl2;
2993
5db1eb8d 2994 retop = dofindlabel(gotoprobe, label, label_len, label_flags,
2b597662
GS
2995 enterops, enterops + GOTO_DEPTH);
2996 if (retop)
2997 break;
e6dae479 2998 if ( (sibl1 = OpSIBLING(gotoprobe)) &&
29e61fd9 2999 sibl1->op_type == OP_UNSTACK &&
e6dae479 3000 (sibl2 = OpSIBLING(sibl1)))
29e61fd9
DM
3001 {
3002 retop = dofindlabel(sibl2,
5db1eb8d
BF
3003 label, label_len, label_flags, enterops,
3004 enterops + GOTO_DEPTH);
eae48c89
Z
3005 if (retop)
3006 break;
3007 }
2b597662 3008 }
3280af22 3009 PL_lastgotoprobe = gotoprobe;
a0d0e21e
LW
3010 }
3011 if (!retop)
b17a0679
FC
3012 DIE(aTHX_ "Can't find label %"UTF8f,
3013 UTF8fARG(label_flags, label_len, label));
a0d0e21e 3014
3b2447bc
RH
3015 /* if we're leaving an eval, check before we pop any frames
3016 that we're not going to punt, otherwise the error
3017 won't be caught */
3018
3019 if (leaving_eval && *enterops && enterops[1]) {
3020 I32 i;
3021 for (i = 1; enterops[i]; i++)
3022 if (enterops[i]->op_type == OP_ENTERITER)
3023 DIE(aTHX_ "Can't \"goto\" into the middle of a foreach loop");
3024 }
3025
b500e03b
GG
3026 if (*enterops && enterops[1]) {
3027 I32 i = enterops[1]->op_type == OP_ENTER && in_block ? 2 : 1;
3028 if (enterops[i])
3029 deprecate("\"goto\" to jump into a construct");
3030 }
3031
a0d0e21e
LW
3032 /* pop unwanted frames */
3033
3034 if (ix < cxstack_ix) {
a0d0e21e 3035 if (ix < 0)
5edb7975 3036 DIE(aTHX_ "panic: docatch: illegal ix=%ld", (long)ix);
a0d0e21e
LW
3037 dounwind(ix);
3038 TOPBLOCK(cx);
a0d0e21e
LW
3039 }
3040
3041 /* push wanted frames */
3042
748a9306 3043 if (*enterops && enterops[1]) {
0bd48802 3044 OP * const oldop = PL_op;
33d34e4c
AE
3045 ix = enterops[1]->op_type == OP_ENTER && in_block ? 2 : 1;
3046 for (; enterops[ix]; ix++) {
533c011a 3047 PL_op = enterops[ix];
84902520
TB
3048 /* Eventually we may want to stack the needed arguments
3049 * for each op. For now, we punt on the hard ones. */
533c011a 3050 if (PL_op->op_type == OP_ENTERITER)
894356b3 3051 DIE(aTHX_ "Can't \"goto\" into the middle of a foreach loop");
16c91539 3052 PL_op->op_ppaddr(aTHX);
a0d0e21e 3053 }
533c011a 3054 PL_op = oldop;
a0d0e21e
LW
3055 }
3056 }
3057
2631bbca 3058 if (do_dump) {
a5f75d66 3059#ifdef VMS
6b88bc9c 3060 if (!retop) retop = PL_main_start;
a5f75d66 3061#endif
3280af22
NIS
3062 PL_restartop = retop;
3063 PL_do_undump = TRUE;
a0d0e21e
LW
3064
3065 my_unexec();
3066
3280af22
NIS
3067 PL_restartop = 0; /* hmm, must be GNU unexec().. */
3068 PL_do_undump = FALSE;
a0d0e21e
LW
3069 }
3070
51eb35b5
DD
3071 putback_return:
3072 PL_stack_sp = sp;
3073 _return:
47c9d59f 3074 PERL_ASYNC_CHECK();
51eb35b5 3075 return retop;
a0d0e21e
LW
3076}
3077
3078PP(pp_exit)
3079{
39644a26 3080 dSP;
a0d0e21e
LW
3081 I32 anum;
3082
3083 if (MAXARG < 1)
3084 anum = 0;
9d3c658e
FC
3085 else if (!TOPs) {
3086 anum = 0; (void)POPs;
3087 }
ff0cee69 3088 else {
a0d0e21e 3089 anum = SvIVx(POPs);
d98f61e7 3090#ifdef VMS
5450b4d8
FC
3091 if (anum == 1
3092 && SvTRUE(cop_hints_fetch_pvs(PL_curcop, "vmsish_exit", 0)))
ff0cee69 3093 anum = 0;
97124ef6
FC
3094 VMSISH_HUSHED =
3095 VMSISH_HUSHED || (PL_curcop->op_private & OPpHUSH_VMSISH);
ff0cee69
PP
3096#endif
3097 }
cc3604b1 3098 PL_exit_flags |= PERL_EXIT_EXPECTED;
a0d0e21e 3099 my_exit(anum);
3280af22 3100 PUSHs(&PL_sv_undef);
a0d0e21e
LW
3101 RETURN;
3102}
3103
a0d0e21e
LW
3104/* Eval. */
3105
0824fdcb 3106STATIC void
cea2e8a9 3107S_save_lines(pTHX_ AV *array, SV *sv)
a0d0e21e 3108{
504618e9 3109 const char *s = SvPVX_const(sv);
890ce7af 3110 const char * const send = SvPVX_const(sv) + SvCUR(sv);
504618e9 3111 I32 line = 1;
a0d0e21e 3112
7918f24d
NC
3113 PERL_ARGS_ASSERT_SAVE_LINES;
3114
a0d0e21e 3115 while (s && s < send) {
f54cb97a 3116 const char *t;
b9f83d2f 3117 SV * const tmpstr = newSV_type(SVt_PVMG);
a0d0e21e 3118
1d963ff3 3119 t = (const char *)memchr(s, '\n', send - s);
a0d0e21e
LW
3120 if (t)
3121 t++;
3122 else
3123 t = send;
3124
3125 sv_setpvn(tmpstr, s, t - s);
3126 av_store(array, line++, tmpstr);
3127 s = t;
3128 }
3129}
3130
22f16304
RU
3131/*
3132=for apidoc docatch
3133
3134Check for the cases 0 or 3 of cur_env.je_ret, only used inside an eval context.
3135
31360 is used as continue inside eval,
3137
31383 is used for a die caught by an inner eval - continue inner loop
3139
75af9d73 3140See F<cop.h>: je_mustcatch, when set at any runlevel to TRUE, means eval ops must
22f16304
RU
3141establish a local jmpenv to handle exception traps.
3142
3143=cut
3144*/
0824fdcb 3145STATIC OP *
cea2e8a9 3146S_docatch(pTHX_ OP *o)
1e422769 3147{
6224f72b 3148 int ret;
06b5626a 3149 OP * const oldop = PL_op;
db36c5a1 3150 dJMPENV;
1e422769 3151
1e422769 3152#ifdef DEBUGGING
54310121 3153 assert(CATCH_GET == TRUE);
1e422769 3154#endif
312caa8e 3155 PL_op = o;
8bffa5f8 3156
14dd3ad8 3157 JMPENV_PUSH(ret);
6224f72b 3158 switch (ret) {
312caa8e 3159 case 0:
abd70938
DM
3160 assert(cxstack_ix >= 0);
3161 assert(CxTYPE(&cxstack[cxstack_ix]) == CXt_EVAL);
3162 cxstack[cxstack_ix].blk_eval.cur_top_env = PL_top_env;
14dd3ad8 3163 redo_body:
85aaa934 3164 CALLRUNOPS(aTHX);
312caa8e
CS
3165 break;
3166 case 3:
8bffa5f8 3167 /* die caught by an inner eval - continue inner loop */
febb3a6d
Z
3168 if (PL_restartop && PL_restartjmpenv == PL_top_env) {
3169 PL_restartjmpenv = NULL;
312caa8e
CS
3170 PL_op = PL_restartop;
3171 PL_restartop = 0;
3172 goto redo_body;
3173 }
924ba076 3174 /* FALLTHROUGH */
312caa8e 3175 default:
14dd3ad8 3176 JMPENV_POP;
533c011a 3177 PL_op = oldop;
6224f72b 3178 JMPENV_JUMP(ret);
e5964223 3179 NOT_REACHED; /* NOTREACHED */
1e422769 3180 }
14dd3ad8 3181 JMPENV_POP;
533c011a 3182 PL_op = oldop;
5f66b61c 3183 return NULL;
1e422769
PP
3184}
3185
a3985cdc
DM
3186
3187/*
3188=for apidoc find_runcv
3189
3190Locate the CV corresponding to the currently executing sub or eval.
796b6530
KW
3191If C<db_seqp> is non_null, skip CVs that are in the DB package and populate
3192C<*db_seqp> with the cop sequence number at the point that the DB:: code was
72d33970
FC
3193entered. (This allows debuggers to eval in the scope of the breakpoint
3194rather than in the scope of the debugger itself.)
a3985cdc
DM
3195
3196=cut
3197*/
3198
3199CV*
d819b83a 3200Perl_find_runcv(pTHX_ U32 *db_seqp)
a3985cdc 3201{
db4cf31d 3202 return Perl_find_runcv_where(aTHX_ 0, 0, db_seqp);
70794f7b
FC
3203}
3204
3205/* If this becomes part of the API, it might need a better name. */
3206CV *
db4cf31d 3207Perl_find_runcv_where(pTHX_ U8 cond, IV arg, U32 *db_seqp)
70794f7b 3208{
a3985cdc 3209 PERL_SI *si;
b4b0692a 3210 int level = 0;
a3985cdc 3211
d819b83a 3212 if (db_seqp)
c3923c33
DM
3213 *db_seqp =
3214 PL_curcop == &PL_compiling
3215 ? PL_cop_seqmax
3216 : PL_curcop->cop_seq;
3217
a3985cdc 3218 for (si = PL_curstackinfo; si; si = si->si_prev) {
06b5626a 3219 I32 ix;
a3985cdc 3220 for (ix = si->si_cxix; ix >= 0; ix--) {
06b5626a 3221 const PERL_CONTEXT *cx = &(si->si_cxstack[ix]);
70794f7b 3222 CV *cv = NULL;
d819b83a 3223 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
70794f7b 3224 cv = cx->blk_sub.cv;
d819b83a
DM
3225 /* skip DB:: code */
3226 if (db_seqp && PL_debstash && CvSTASH(cv) == PL_debstash) {
3227 *db_seqp = cx->blk_oldcop->cop_seq;
3228 continue;
3229 }
a453e28a
DM
3230 if (cx->cx_type & CXp_SUB_RE)
3231 continue;
d819b83a 3232 }
a3985cdc 3233 else if (CxTYPE(cx) == CXt_EVAL && !CxTRYBLOCK(cx))
70794f7b
FC
3234 cv = cx->blk_eval.cv;
3235 if (cv) {
3236 switch (cond) {
db4cf31d
FC
3237 case FIND_RUNCV_padid_eq:
3238 if (!CvPADLIST(cv)
b4db5868 3239 || CvPADLIST(cv)->xpadl_id != (U32)arg)
8771da69 3240 continue;
b4b0692a
FC
3241 return cv;
3242 case FIND_RUNCV_level_eq:
db4cf31d 3243 if (level++ != arg) continue;
70794f7b
FC
3244 /* GERONIMO! */
3245 default:
3246 return cv;
3247 }
3248 }
a3985cdc
DM
3249 }
3250 }
db4cf31d 3251 return cond == FIND_RUNCV_padid_eq ? NULL : PL_main_cv;
a3985cdc
DM
3252}
3253
3254
27e90453
DM
3255/* Run yyparse() in a setjmp wrapper. Returns:
3256 * 0: yyparse() successful
3257 * 1: yyparse() failed
3258 * 3: yyparse() died
3259 */
3260STATIC int
28ac2b49 3261S_try_yyparse(pTHX_ int gramtype)
27e90453
DM
3262{
3263 int ret;
3264 dJMPENV;
3265
3266 assert(CxTYPE(&cxstack[cxstack_ix]) == CXt_EVAL);
3267 JMPENV_PUSH(ret);
3268 switch (ret) {
3269 case 0:
28ac2b49 3270 ret = yyparse(gramtype) ? 1 : 0;
27e90453
DM
3271 break;
3272 case 3:
3273 break;
3274 default:
3275 JMPENV_POP;
3276 JMPENV_JUMP(ret);
e5964223 3277 NOT_REACHED; /* NOTREACHED */
27e90453
DM
3278 }
3279 JMPENV_POP;
3280 return ret;
3281}
3282
3283
104a8185
DM
3284/* Compile a require/do or an eval ''.
3285 *
a3985cdc 3286 * outside is the lexically enclosing CV (if any) that invoked us.
104a8185
DM
3287 * seq is the current COP scope value.
3288 * hh is the saved hints hash, if any.
3289 *
410be5db 3290 * Returns a bool indicating whether the compile was successful; if so,
104a8185
DM
3291 * PL_eval_start contains the first op of the compiled code; otherwise,
3292 * pushes undef.
3293 *
3294 * This function is called from two places: pp_require and pp_entereval.
3295 * These can be distinguished by whether PL_op is entereval.
7d116edc
FC
3296 */
3297
410be5db 3298STATIC bool
104a8185 3299S_doeval(pTHX_ int gimme, CV* outside, U32 seq, HV *hh)
a0d0e21e 3300{
20b7effb 3301 dSP;
46c461b5 3302 OP * const saveop = PL_op;
104a8185 3303 bool clear_hints = saveop->op_type != OP_ENTEREVAL;
f45b078d 3304 COP * const oldcurcop = PL_curcop;
26c9400e 3305 bool in_require = (saveop->op_type == OP_REQUIRE);
27e90453 3306 int yystatus;
676a678a 3307 CV *evalcv;
a0d0e21e 3308
27e90453 3309 PL_in_eval = (in_require
6dc8a9e4 3310 ? (EVAL_INREQUIRE | (PL_in_eval & EVAL_INEVAL))
a1941760
DM
3311 : (EVAL_INEVAL |
3312 ((PL_op->op_private & OPpEVAL_RE_REPARSING)
3313 ? EVAL_RE_REPARSING : 0)));
a0d0e21e 3314
1ce6579f
PP
3315 PUSHMARK(SP);
3316
676a678a
Z
3317 evalcv = MUTABLE_CV(newSV_type(SVt_PVCV));
3318 CvEVAL_on(evalcv);
2090ab20 3319 assert(CxTYPE(&cxstack[cxstack_ix]) == CXt_EVAL);
676a678a 3320 cxstack[cxstack_ix].blk_eval.cv = evalcv;
86a64801 3321 cxstack[cxstack_ix].blk_gimme = gimme;
2090ab20 3322
676a678a
Z
3323 CvOUTSIDE_SEQ(evalcv) = seq;
3324 CvOUTSIDE(evalcv) = MUTABLE_CV(SvREFCNT_inc_simple(outside));
a3985cdc 3325
dd2155a4 3326 /* set up a scratch pad */
a0d0e21e 3327
eacbb379 3328 CvPADLIST_set(evalcv, pad_new(padnew_SAVE));
cecbe010 3329 PL_op = NULL; /* avoid PL_op and PL_curpad referring to different CVs */
2c05e328 3330
07055b4c 3331
b5bbe64a 3332 SAVEMORTALIZESV(evalcv); /* must remain until end of current statement */
748a9306 3333
a0d0e21e
LW
3334 /* make sure we compile in the right package */
3335
ed094faf 3336 if (CopSTASH_ne(PL_curcop, PL_curstash)) {
03d9f026 3337 SAVEGENERICSV(PL_curstash);
cb1ad50e
FC
3338 PL_curstash = (HV *)CopSTASH(PL_curcop);
3339 if (SvTYPE(PL_curstash) != SVt_PVHV) PL_curstash = NULL;
3340 else SvREFCNT_inc_simple_void(PL_curstash);
a0d0e21e 3341 }
3c10abe3 3342 /* XXX:ajgo do we really need to alloc an AV for begin/checkunit */
3280af22
NIS
3343 SAVESPTR(PL_beginav);
3344 PL_beginav = newAV();
3345 SAVEFREESV(PL_beginav);
3c10abe3
AG
3346 SAVESPTR(PL_unitcheckav);
3347 PL_unitcheckav = newAV();
3348 SAVEFREESV(PL_unitcheckav);
a0d0e21e 3349
81d86705 3350
104a8185 3351 ENTER_with_name("evalcomp");
676a678a
Z
3352 SAVESPTR(PL_compcv);
3353 PL_compcv = evalcv;
3354
a0d0e21e
LW
3355 /* try to compile it */
3356
5f66b61c 3357 PL_eval_root = NULL;
3280af22 3358 PL_curcop = &PL_compiling;
26c9400e 3359 if ((saveop->op_type != OP_REQUIRE) && (saveop->op_flags & OPf_SPECIAL))
faef0170 3360 PL_in_eval |= EVAL_KEEPERR;
ab69dbc2
RGS
3361 else
3362 CLEAR_ERRSV();
27e90453 3363
377b5421
DM
3364 SAVEHINTS();
3365 if (clear_hints) {
3366 PL_hints = 0;
3367 hv_clear(GvHV(PL_hintgv));
3368 }
3369 else {
3370 PL_hints = saveop->op_private & OPpEVAL_COPHH
3371 ? oldcurcop->cop_hints : saveop->op_targ;
4f3e2518
DM
3372
3373 /* making 'use re eval' not be in scope when compiling the
3374 * qr/mabye_has_runtime_code_block/ ensures that we don't get
3375 * infinite recursion when S_has_runtime_code() gives a false
3376 * positive: the second time round, HINT_RE_EVAL isn't set so we
3377 * don't bother calling S_has_runtime_code() */
3378 if (PL_in_eval & EVAL_RE_REPARSING)
3379 PL_hints &= ~HINT_RE_EVAL;
3380
377b5421
DM
3381 if (hh) {
3382 /* SAVEHINTS created a new HV in PL_hintgv, which we need to GC */
3383 SvREFCNT_dec(GvHV(PL_hintgv));
3384 GvHV(PL_hintgv) = hh;
3385 }
3386 }
3387 SAVECOMPILEWARNINGS();
3388 if (clear_hints) {
3389 if (PL_dowarn & G_WARN_ALL_ON)
3390 PL_compiling.cop_warnings = pWARN_ALL ;
3391 else if (PL_dowarn & G_WARN_ALL_OFF)
3392 PL_compiling.cop_warnings = pWARN_NONE ;
3393 else
3394 PL_compiling.cop_warnings = pWARN_STD ;
3395 }
3396 else {
3397 PL_compiling.cop_warnings =
3398 DUP_WARNINGS(oldcurcop->cop_warnings);
3399 cophh_free(CopHINTHASH_get(&PL_compiling));
3400 if (Perl_cop_fetch_label(aTHX_ oldcurcop, NULL, NULL)) {
3401 /* The label, if present, is the first entry on the chain. So rather
3402 than writing a blank label in front of it (which involves an
3403 allocation), just use the next entry in the chain. */
3404 PL_compiling.cop_hints_hash
3405 = cophh_copy(oldcurcop->cop_hints_hash->refcounted_he_next);
3406 /* Check the assumption that this removed the label. */
3407 assert(Perl_cop_fetch_label(aTHX_ &PL_compiling, NULL, NULL) == NULL);
f45b078d 3408 }
377b5421
DM
3409 else
3410 PL_compiling.cop_hints_hash = cophh_copy(oldcurcop->cop_hints_hash);
3411 }
f45b078d 3412
a88d97bf 3413 CALL_BLOCK_HOOKS(bhk_eval, saveop);
52db365a 3414
27e90453
DM
3415 /* note that yyparse() may raise an exception, e.g. C<BEGIN{die}>,
3416 * so honour CATCH_GET and trap it here if necessary */
3417
28ac2b49 3418 yystatus = (!in_require && CATCH_GET) ? S_try_yyparse(aTHX_ GRAMPROG) : yyparse(GRAMPROG);
27e90453
DM
3419