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[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
d7e3f70f
Z		 37#define RUN_PP_CATCHABLY(thispp) \
38 STMT_START { if (CATCH_GET) return docatch(thispp); } STMT_END
1e422769 39
94fcd414
NC		 40#define dopoptosub(plop) dopoptosub_at(cxstack, (plop))
41
a0d0e21e
LW		 42PP(pp_wantarray)
43{
39644a26 44 dSP;
a0d0e21e 45 I32 cxix;
93f0bc49 46 const PERL_CONTEXT *cx;
a0d0e21e
LW		 47 EXTEND(SP, 1);
48
93f0bc49
FC		 49 if (PL_op->op_private & OPpOFFBYONE) {
50 if (!(cx = caller_cx(1,NULL))) RETPUSHUNDEF;
51 }
52 else {
20ef288c 53 cxix = dopoptosub(cxstack_ix);
93f0bc49 54 if (cxix < 0)
a0d0e21e 55 RETPUSHUNDEF;
93f0bc49
FC		 56 cx = &cxstack[cxix];
57 }
a0d0e21e 58
93f0bc49 59 switch (cx->blk_gimme) {
54310121 60 case G_ARRAY:
a0d0e21e 61 RETPUSHYES;
54310121 62 case G_SCALAR:
a0d0e21e 63 RETPUSHNO;
54310121
PP		 64 default:
65 RETPUSHUNDEF;
66 }
a0d0e21e
LW		 67}
68
2cd61cdb
IZ		 69PP(pp_regcreset)
70{
0b4182de 71 TAINT_NOT;
2cd61cdb
IZ		 72 return NORMAL;
73}
74
b3eb6a9b
GS		 75PP(pp_regcomp)
76{
39644a26 77 dSP;
eb578fdb 78 PMOP *pm = (PMOP*)cLOGOP->op_other;
9f141731 79 SV **args;
df787a7b 80 int nargs;
84679df5 81 REGEXP *re = NULL;
9f141731
DM		 82 REGEXP *new_re;
83 const regexp_engine *eng;
dbc200c5 84 bool is_bare_re= FALSE;
bfed75c6 85
df787a7b
DM		 86 if (PL_op->op_flags & OPf_STACKED) {
87 dMARK;
88 nargs = SP - MARK;
89 args = ++MARK;
90 }
91 else {
92 nargs = 1;
93 args = SP;
94 }
95
4b5a0d1c 96 /* prevent recompiling under /o and ithreads. */
3db8f154 97#if defined(USE_ITHREADS)
131b3ad0 98 if (pm->op_pmflags & PMf_KEEP && PM_GETRE(pm)) {
df787a7b 99 SP = args-1;
131b3ad0
DM		 100 RETURN;
101 }
513629ba 102#endif
d4b87e75 103
9f141731
DM		 104 re = PM_GETRE(pm);
105 assert (re != (REGEXP*) &PL_sv_undef);
106 eng = re ? RX_ENGINE(re) : current_re_engine();
107
3c13cae6
DM		 108 new_re = (eng->op_comp
109 ? eng->op_comp
110 : &Perl_re_op_compile
111 )(aTHX_ args, nargs, pm->op_code_list, eng, re,
346d3070 112 &is_bare_re,
dbc200c5 113 (pm->op_pmflags & RXf_PMf_FLAGCOPYMASK),
a5ae69f0
DM		 114 pm->op_pmflags |
115 (PL_op->op_flags & OPf_SPECIAL ? PMf_USE_RE_EVAL : 0));
dbc200c5 116
346d3070 117 if (pm->op_pmflags & PMf_HAS_CV)
8d919b0a 118 ReANY(new_re)->qr_anoncv
9fe3265f 119 = (CV*) SvREFCNT_inc(PAD_SV(PL_op->op_targ));
9f141731
DM		 120
121 if (is_bare_re) {
122 REGEXP *tmp;
123 /* The match's LHS's get-magic might need to access this op's regexp
124 (e.g. $' =~ /$re/ while foo; see bug 70764). So we must call
125 get-magic now before we replace the regexp. Hopefully this hack can
126 be replaced with the approach described at
127 http://www.nntp.perl.org/group/perl.perl5.porters/2007/03/msg122415.html
128 some day. */
129 if (pm->op_type == OP_MATCH) {
130 SV *lhs;
284167a5 131 const bool was_tainted = TAINT_get;
9f141731
DM		 132 if (pm->op_flags & OPf_STACKED)
133 lhs = args[-1];
6ffceeb7 134 else if (pm->op_targ)
9f141731
DM		 135 lhs = PAD_SV(pm->op_targ);
136 else lhs = DEFSV;
137 SvGETMAGIC(lhs);
138 /* Restore the previous value of PL_tainted (which may have been
139 modified by get-magic), to avoid incorrectly setting the
284167a5
SM		 140 RXf_TAINTED flag with RX_TAINT_on further down. */
141 TAINT_set(was_tainted);
dc6d7f5c 142#ifdef NO_TAINT_SUPPORT
9a9b5ec9
DM		 143 PERL_UNUSED_VAR(was_tainted);
144#endif
df787a7b 145 }
9f141731
DM		 146 tmp = reg_temp_copy(NULL, new_re);
147 ReREFCNT_dec(new_re);
148 new_re = tmp;
df787a7b 149 }
dbc200c5 150
9f141731
DM		 151 if (re != new_re) {
152 ReREFCNT_dec(re);
153 PM_SETRE(pm, new_re);
c277df42 154 }
d4b87e75 155
dbc200c5 156
d48c660d
DM		 157 assert(TAINTING_get || !TAINT_get);
158 if (TAINT_get) {
9f141731 159 SvTAINTED_on((SV*)new_re);
284167a5 160 RX_TAINT_on(new_re);
72311751 161 }
72311751 162
5585e758
YO		 163 /* handle the empty pattern */
164 if (!RX_PRELEN(PM_GETRE(pm)) && PL_curpm) {
165 if (PL_curpm == PL_reg_curpm) {
3cb4cde3
TC		 166 if (PL_curpm_under && PL_curpm_under == PL_reg_curpm) {
167 Perl_croak(aTHX_ "Infinite recursion via empty pattern");
5585e758 168 }
5585e758
YO		 169 }
170 }
171
c737faaf
YO		 172#if !defined(USE_ITHREADS)
173 /* can't change the optree at runtime either */
174 /* PMf_KEEP is handled differently under threads to avoid these problems */
a0d0e21e 175 if (pm->op_pmflags & PMf_KEEP) {
533c011a 176 cLOGOP->op_first->op_next = PL_op->op_next;
a0d0e21e 177 }
c737faaf 178#endif
9f141731 179
df787a7b 180 SP = args-1;
a0d0e21e
LW		 181 RETURN;
182}
183
9f141731 184
a0d0e21e
LW		 185PP(pp_substcont)
186{
39644a26 187 dSP;
4ebe6e95 188 PERL_CONTEXT *cx = CX_CUR();
eb578fdb
KW		 189 PMOP * const pm = (PMOP*) cLOGOP->op_other;
190 SV * const dstr = cx->sb_dstr;
191 char *s = cx->sb_s;
192 char *m = cx->sb_m;
a0d0e21e 193 char *orig = cx->sb_orig;
eb578fdb 194 REGEXP * const rx = cx->sb_rx;
c445ea15 195 SV *nsv = NULL;
988e6e7e 196 REGEXP *old = PM_GETRE(pm);
f410a211
NC		 197
198 PERL_ASYNC_CHECK();
199
988e6e7e 200 if(old != rx) {
bfed75c6 201 if(old)
988e6e7e 202 ReREFCNT_dec(old);
d6106309 203 PM_SETRE(pm,ReREFCNT_inc(rx));
d8f2cf8a
AB		 204 }
205
d9f97599 206 rxres_restore(&cx->sb_rxres, rx);
c90c0ff4 207
a0d0e21e 208 if (cx->sb_iters++) {
3c6ef0a5 209 const SSize_t saviters = cx->sb_iters;
a0d0e21e 210 if (cx->sb_iters > cx->sb_maxiters)
cea2e8a9 211 DIE(aTHX_ "Substitution loop");
a0d0e21e 212
447ee134
DM		 213 SvGETMAGIC(TOPs); /* possibly clear taint on $1 etc: #67962 */
214
ef07e810 215 /* See "how taint works" above pp_subst() */
447ee134 216 sv_catsv_nomg(dstr, POPs);
c4f4b223
Z		 217 if (UNLIKELY(TAINT_get))
218 cx->sb_rxtainted |= SUBST_TAINT_REPL;
2c296965 219 if (CxONCE(cx) || s < orig ||
03c83e26
DM		 220 !CALLREGEXEC(rx, s, cx->sb_strend, orig,
221 (s == m), cx->sb_targ, NULL,
d5e7783a 222 (REXEC_IGNOREPOS|REXEC_NOT_FIRST|REXEC_FAIL_ON_UNDERFLOW)))
a0d0e21e 223 {
8ca8a454 224 SV *targ = cx->sb_targ;
748a9306 225
078c425b
JH		 226 assert(cx->sb_strend >= s);
227 if(cx->sb_strend > s) {
228 if (DO_UTF8(dstr) && !SvUTF8(targ))
4bac9ae4 229 sv_catpvn_nomg_utf8_upgrade(dstr, s, cx->sb_strend - s, nsv);
078c425b 230 else
4bac9ae4 231 sv_catpvn_nomg(dstr, s, cx->sb_strend - s);
078c425b 232 }
20be6587
DM		 233 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
234 cx->sb_rxtainted |= SUBST_TAINT_PAT;
9212bbba 235
8ca8a454
NC		 236 if (pm->op_pmflags & PMf_NONDESTRUCT) {
237 PUSHs(dstr);
238 /* From here on down we're using the copy, and leaving the
239 original untouched. */
240 targ = dstr;
241 }
242 else {
9e0ea7f3
FC		 243 SV_CHECK_THINKFIRST_COW_DROP(targ);
244 if (isGV(targ)) Perl_croak_no_modify();
245 SvPV_free(targ);
8ca8a454
NC		 246 SvPV_set(targ, SvPVX(dstr));
247 SvCUR_set(targ, SvCUR(dstr));
248 SvLEN_set(targ, SvLEN(dstr));
249 if (DO_UTF8(dstr))
250 SvUTF8_on(targ);
251 SvPV_set(dstr, NULL);
252
52c47e16 253 PL_tainted = 0;
4f4d7508 254 mPUSHi(saviters - 1);
48c036b1 255
8ca8a454
NC		 256 (void)SvPOK_only_UTF8(targ);
257 }
5cd24f17 258
20be6587 259 /* update the taint state of various various variables in
ef07e810
DM		 260 * preparation for final exit.
261 * See "how taint works" above pp_subst() */
284167a5 262 if (TAINTING_get) {
20be6587
DM		 263 if ((cx->sb_rxtainted & SUBST_TAINT_PAT) ||
264 ((cx->sb_rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
265 == (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
266 )
267 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
268
269 if (!(cx->sb_rxtainted & SUBST_TAINT_BOOLRET)
270 && (cx->sb_rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT))
271 )
272 SvTAINTED_on(TOPs); /* taint return value */
273 /* needed for mg_set below */
284167a5
SM		 274 TAINT_set(
275 cBOOL(cx->sb_rxtainted &
276 (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL))
277 );
4a69216a
DM		 278
279 /* sv_magic(), when adding magic (e.g.taint magic), also
280 * recalculates any pos() magic, converting any byte offset
281 * to utf8 offset. Make sure pos() is reset before this
282 * happens rather than using the now invalid value (since
283 * we've just replaced targ's pvx buffer with the
284 * potentially shorter dstr buffer). Normally (i.e. in
285 * non-taint cases), pos() gets removed a few lines later
286 * with the SvSETMAGIC().
287 */
288 {
289 MAGIC *mg;
290 mg = mg_find_mglob(targ);
291 if (mg) {
292 MgBYTEPOS_set(mg, targ, SvPVX(targ), -1);
293 }
294 }
295
20be6587
DM		 296 SvTAINT(TARG);
297 }
298 /* PL_tainted must be correctly set for this mg_set */
299 SvSETMAGIC(TARG);
300 TAINT_NOT;
80d88db0 301
8e7e33ef 302 CX_LEAVE_SCOPE(cx);
b405d38b 303 CX_POPSUBST(cx);
5da525e9 304 CX_POP(cx);
80d88db0 305
47c9d59f 306 PERL_ASYNC_CHECK();
a0d0e21e 307 RETURNOP(pm->op_next);
e5964223 308 NOT_REACHED; /* NOTREACHED */
a0d0e21e 309 }
8e5e9ebe 310 cx->sb_iters = saviters;
a0d0e21e 311 }
07bc277f 312 if (RX_MATCH_COPIED(rx) && RX_SUBBEG(rx) != orig) {
a0d0e21e
LW		 313 m = s;
314 s = orig;
6502e081 315 assert(!RX_SUBOFFSET(rx));
07bc277f 316 cx->sb_orig = orig = RX_SUBBEG(rx);
a0d0e21e
LW		 317 s = orig + (m - s);
318 cx->sb_strend = s + (cx->sb_strend - m);
319 }
07bc277f 320 cx->sb_m = m = RX_OFFS(rx)[0].start + orig;
db79b45b 321 if (m > s) {
bfed75c6 322 if (DO_UTF8(dstr) && !SvUTF8(cx->sb_targ))
4bac9ae4 323 sv_catpvn_nomg_utf8_upgrade(dstr, s, m - s, nsv);
db79b45b 324 else
4bac9ae4 325 sv_catpvn_nomg(dstr, s, m-s);
db79b45b 326 }
07bc277f 327 cx->sb_s = RX_OFFS(rx)[0].end + orig;
084916e3 328 { /* Update the pos() information. */
8ca8a454
NC		 329 SV * const sv
330 = (pm->op_pmflags & PMf_NONDESTRUCT) ? cx->sb_dstr : cx->sb_targ;
084916e3 331 MAGIC *mg;
a911bb25
DM		 332
333 /* the string being matched against may no longer be a string,
334 * e.g. $_=0; s/.../$_++/ge */
335
336 if (!SvPOK(sv))
337 SvPV_force_nomg_nolen(sv);
338
96c2a8ff
FC		 339 if (!(mg = mg_find_mglob(sv))) {
340 mg = sv_magicext_mglob(sv);
084916e3 341 }
cda67c99 342 MgBYTEPOS_set(mg, sv, SvPVX(sv), m - orig);
084916e3 343 }
988e6e7e 344 if (old != rx)
d6106309 345 (void)ReREFCNT_inc(rx);
20be6587 346 /* update the taint state of various various variables in preparation
ef07e810
DM		 347 * for calling the code block.
348 * See "how taint works" above pp_subst() */
284167a5 349 if (TAINTING_get) {
20be6587
DM		 350 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
351 cx->sb_rxtainted |= SUBST_TAINT_PAT;
352
353 if ((cx->sb_rxtainted & SUBST_TAINT_PAT) ||
354 ((cx->sb_rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
355 == (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
356 )
357 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
358
359 if (cx->sb_iters > 1 && (cx->sb_rxtainted &
360 (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL)))
8ca8a454
NC		 361 SvTAINTED_on((pm->op_pmflags & PMf_NONDESTRUCT)
362 ? cx->sb_dstr : cx->sb_targ);
20be6587
DM		 363 TAINT_NOT;
364 }
d9f97599 365 rxres_save(&cx->sb_rxres, rx);
af9838cc 366 PL_curpm = pm;
29f2e912 367 RETURNOP(pm->op_pmstashstartu.op_pmreplstart);
a0d0e21e
LW		 368}
369
c90c0ff4 370void
864dbfa3 371Perl_rxres_save(pTHX_ void **rsp, REGEXP *rx)
c90c0ff4
PP		 372{
373 UV *p = (UV*)*rsp;
374 U32 i;
7918f24d
NC		 375
376 PERL_ARGS_ASSERT_RXRES_SAVE;
96a5add6 377 PERL_UNUSED_CONTEXT;
c90c0ff4 378
07bc277f 379 if (!p || p[1] < RX_NPARENS(rx)) {
db2c6cb3 380#ifdef PERL_ANY_COW
6502e081 381 i = 7 + (RX_NPARENS(rx)+1) * 2;
ed252734 382#else
6502e081 383 i = 6 + (RX_NPARENS(rx)+1) * 2;
ed252734 384#endif
c90c0ff4 385 if (!p)
a02a5408 386 Newx(p, i, UV);
c90c0ff4
PP		 387 else
388 Renew(p, i, UV);
389 *rsp = (void*)p;
390 }
391
5eabab15
DM		 392 /* what (if anything) to free on croak */
393 *p++ = PTR2UV(RX_MATCH_COPIED(rx) ? RX_SUBBEG(rx) : NULL);
cf93c79d 394 RX_MATCH_COPIED_off(rx);
6c31ff74 395 *p++ = RX_NPARENS(rx);
c90c0ff4 396
db2c6cb3 397#ifdef PERL_ANY_COW
bdd9a1b1
NC		 398 *p++ = PTR2UV(RX_SAVED_COPY(rx));
399 RX_SAVED_COPY(rx) = NULL;
ed252734
NC		 400#endif
401
07bc277f
NC		 402 *p++ = PTR2UV(RX_SUBBEG(rx));
403 *p++ = (UV)RX_SUBLEN(rx);
6502e081
DM		 404 *p++ = (UV)RX_SUBOFFSET(rx);
405 *p++ = (UV)RX_SUBCOFFSET(rx);
07bc277f
NC		 406 for (i = 0; i <= RX_NPARENS(rx); ++i) {
407 *p++ = (UV)RX_OFFS(rx)[i].start;
408 *p++ = (UV)RX_OFFS(rx)[i].end;
c90c0ff4
PP		 409 }
410}
411
9c105995
NC		 412static void
413S_rxres_restore(pTHX_ void **rsp, REGEXP *rx)
c90c0ff4
PP		 414{
415 UV *p = (UV*)*rsp;
416 U32 i;
7918f24d
NC		 417
418 PERL_ARGS_ASSERT_RXRES_RESTORE;
96a5add6 419 PERL_UNUSED_CONTEXT;
c90c0ff4 420
ed252734 421 RX_MATCH_COPY_FREE(rx);
cf93c79d 422 RX_MATCH_COPIED_set(rx, *p);
c90c0ff4 423 *p++ = 0;
6c31ff74 424 RX_NPARENS(rx) = *p++;
c90c0ff4 425
db2c6cb3 426#ifdef PERL_ANY_COW
bdd9a1b1
NC		 427 if (RX_SAVED_COPY(rx))
428 SvREFCNT_dec (RX_SAVED_COPY(rx));
429 RX_SAVED_COPY(rx) = INT2PTR(SV*,*p);
ed252734
NC		 430 *p++ = 0;
431#endif
432
07bc277f
NC		 433 RX_SUBBEG(rx) = INT2PTR(char*,*p++);
434 RX_SUBLEN(rx) = (I32)(*p++);
6502e081
DM		 435 RX_SUBOFFSET(rx) = (I32)*p++;
436 RX_SUBCOFFSET(rx) = (I32)*p++;
07bc277f
NC		 437 for (i = 0; i <= RX_NPARENS(rx); ++i) {
438 RX_OFFS(rx)[i].start = (I32)(*p++);
439 RX_OFFS(rx)[i].end = (I32)(*p++);
c90c0ff4
PP		 440 }
441}
442
9c105995
NC		 443static void
444S_rxres_free(pTHX_ void **rsp)
c90c0ff4 445{
44f8325f 446 UV * const p = (UV*)*rsp;
7918f24d
NC		 447
448 PERL_ARGS_ASSERT_RXRES_FREE;
96a5add6 449 PERL_UNUSED_CONTEXT;
c90c0ff4
PP		 450
451 if (p) {
94010e71 452 void *tmp = INT2PTR(char*,*p);
6c31ff74 453#ifdef PERL_POISON
db2c6cb3 454#ifdef PERL_ANY_COW
6c31ff74 455 U32 i = 9 + p[1] * 2;
94010e71 456#else
6c31ff74 457 U32 i = 8 + p[1] * 2;
94010e71 458#endif
6c31ff74
NC		 459#endif
460
db2c6cb3 461#ifdef PERL_ANY_COW
6c31ff74 462 SvREFCNT_dec (INT2PTR(SV*,p[2]));
ed252734 463#endif
6c31ff74
NC		 464#ifdef PERL_POISON
465 PoisonFree(p, i, sizeof(UV));
466#endif
467
468 Safefree(tmp);
c90c0ff4 469 Safefree(p);
4608196e 470 *rsp = NULL;
c90c0ff4
PP		 471 }
472}
473
a701009a
DM		 474#define FORM_NUM_BLANK (1<<30)
475#define FORM_NUM_POINT (1<<29)
476
a0d0e21e
LW		 477PP(pp_formline)
478{
20b7effb 479 dSP; dMARK; dORIGMARK;
eb578fdb 480 SV * const tmpForm = *++MARK;
086b26f3 481 SV *formsv; /* contains text of original format */
eb578fdb
KW		 482 U32 *fpc; /* format ops program counter */
483 char *t; /* current append position in target string */
086b26f3 484 const char *f; /* current position in format string */
eb578fdb
KW		 485 I32 arg;
486 SV *sv = NULL; /* current item */
086b26f3 487 const char *item = NULL;/* string value of current item */
9b4bdfd4
DM		 488 I32 itemsize = 0; /* length (chars) of item, possibly truncated */
489 I32 itembytes = 0; /* as itemsize, but length in bytes */
086b26f3
DM		 490 I32 fieldsize = 0; /* width of current field */
491 I32 lines = 0; /* number of lines that have been output */
492 bool chopspace = (strchr(PL_chopset, ' ') != NULL); /* does $: have space */
493 const char *chophere = NULL; /* where to chop current item */
f5ada144 494 STRLEN linemark = 0; /* pos of start of line in output */
65202027 495 NV value;
086b26f3 496 bool gotsome = FALSE; /* seen at least one non-blank item on this line */
9b4bdfd4 497 STRLEN len; /* length of current sv */
732f08da 498 STRLEN linemax; /* estimate of output size in bytes */
1bd51a4c
IH		 499 bool item_is_utf8 = FALSE;
500 bool targ_is_utf8 = FALSE;
bd7084a6 501 const char *fmt;
74e0ddf7 502 MAGIC *mg = NULL;
4ff700b9
DM		 503 U8 *source; /* source of bytes to append */
504 STRLEN to_copy; /* how may bytes to append */
ea60cfe8 505 char trans; /* what chars to translate */
92ff660b 506 bool copied_form = FALSE; /* have we duplicated the form? */
74e0ddf7 507
3808a683 508 mg = doparseform(tmpForm);
a0d0e21e 509
74e0ddf7 510 fpc = (U32*)mg->mg_ptr;
3808a683
DM		 511 /* the actual string the format was compiled from.
512 * with overload etc, this may not match tmpForm */
513 formsv = mg->mg_obj;
514
74e0ddf7 515
3280af22 516 SvPV_force(PL_formtarget, len);
3808a683 517 if (SvTAINTED(tmpForm) || SvTAINTED(formsv))
125b9982 518 SvTAINTED_on(PL_formtarget);
1bd51a4c
IH		 519 if (DO_UTF8(PL_formtarget))
520 targ_is_utf8 = TRUE;
732f08da
DM		 521 /* this is an initial estimate of how much output buffer space
522 * to allocate. It may be exceeded later */
523 linemax = (SvCUR(formsv) * (IN_BYTES ? 1 : 3) + 1);
524 t = SvGROW(PL_formtarget, len + linemax + 1);
26e935cf 525 /* XXX from now onwards, SvCUR(PL_formtarget) is invalid */
a0d0e21e 526 t += len;
3808a683 527 f = SvPV_const(formsv, len);
a0d0e21e
LW		 528
529 for (;;) {
530 DEBUG_f( {
bfed75c6 531 const char *name = "???";
a0d0e21e
LW		 532 arg = -1;
533 switch (*fpc) {
534 case FF_LITERAL: arg = fpc[1]; name = "LITERAL"; break;
535 case FF_BLANK: arg = fpc[1]; name = "BLANK"; break;
536 case FF_SKIP: arg = fpc[1]; name = "SKIP"; break;
537 case FF_FETCH: arg = fpc[1]; name = "FETCH"; break;
538 case FF_DECIMAL: arg = fpc[1]; name = "DECIMAL"; break;
539
540 case FF_CHECKNL: name = "CHECKNL"; break;
541 case FF_CHECKCHOP: name = "CHECKCHOP"; break;
542 case FF_SPACE: name = "SPACE"; break;
543 case FF_HALFSPACE: name = "HALFSPACE"; break;
544 case FF_ITEM: name = "ITEM"; break;
545 case FF_CHOP: name = "CHOP"; break;
546 case FF_LINEGLOB: name = "LINEGLOB"; break;
547 case FF_NEWLINE: name = "NEWLINE"; break;
548 case FF_MORE: name = "MORE"; break;
549 case FF_LINEMARK: name = "LINEMARK"; break;
550 case FF_END: name = "END"; break;
bfed75c6 551 case FF_0DECIMAL: name = "0DECIMAL"; break;
a1b95068 552 case FF_LINESNGL: name = "LINESNGL"; break;
a0d0e21e
LW		 553 }
554 if (arg >= 0)
bf49b057 555 PerlIO_printf(Perl_debug_log, "%-16s%ld\n", name, (long) arg);
a0d0e21e 556 else
bf49b057 557 PerlIO_printf(Perl_debug_log, "%-16s\n", name);
5f80b19c 558 } );
a0d0e21e 559 switch (*fpc++) {
4a73dc0b 560 case FF_LINEMARK: /* start (or end) of a line */
f5ada144 561 linemark = t - SvPVX(PL_formtarget);
a0d0e21e
LW		 562 lines++;
563 gotsome = FALSE;
564 break;
565
4a73dc0b 566 case FF_LITERAL: /* append <arg> literal chars */
ea60cfe8
DM		 567 to_copy = *fpc++;
568 source = (U8 *)f;
569 f += to_copy;
570 trans = '~';
75645721 571 item_is_utf8 = targ_is_utf8 ? !!DO_UTF8(formsv) : !!SvUTF8(formsv);
ea60cfe8 572 goto append;
a0d0e21e 573
4a73dc0b 574 case FF_SKIP: /* skip <arg> chars in format */
a0d0e21e
LW		 575 f += *fpc++;
576 break;
577
4a73dc0b 578 case FF_FETCH: /* get next item and set field size to <arg> */
a0d0e21e
LW		 579 arg = *fpc++;
580 f += arg;
581 fieldsize = arg;
582
583 if (MARK < SP)
584 sv = *++MARK;
585 else {
3280af22 586 sv = &PL_sv_no;
a2a5de95 587 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX), "Not enough format arguments");
a0d0e21e 588 }
125b9982
NT		 589 if (SvTAINTED(sv))
590 SvTAINTED_on(PL_formtarget);
a0d0e21e
LW		 591 break;
592
4a73dc0b 593 case FF_CHECKNL: /* find max len of item (up to \n) that fits field */
5a34cab7 594 {
5a34cab7 595 const char *s = item = SvPV_const(sv, len);
9b4bdfd4
DM		 596 const char *send = s + len;
597
598 itemsize = 0;
599 item_is_utf8 = DO_UTF8(sv);
600 while (s < send) {
601 if (!isCNTRL(*s))
602 gotsome = TRUE;
603 else if (*s == '\n')
604 break;
605
606 if (item_is_utf8)
607 s += UTF8SKIP(s);
608 else
609 s++;
610 itemsize++;
611 if (itemsize == fieldsize)
612 break;
613 }
614 itembytes = s - item;
62db6ea5 615 chophere = s;
5a34cab7 616 break;
a0ed51b3 617 }
a0d0e21e 618
4a73dc0b 619 case FF_CHECKCHOP: /* like CHECKNL, but up to highest split point */
5a34cab7
NC		 620 {
621 const char *s = item = SvPV_const(sv, len);
9b4bdfd4
DM		 622 const char *send = s + len;
623 I32 size = 0;
624
625 chophere = NULL;
626 item_is_utf8 = DO_UTF8(sv);
627 while (s < send) {
628 /* look for a legal split position */
629 if (isSPACE(*s)) {
630 if (*s == '\r') {
631 chophere = s;
632 itemsize = size;
633 break;
634 }
635 if (chopspace) {
636 /* provisional split point */
637 chophere = s;
638 itemsize = size;
639 }
640 /* we delay testing fieldsize until after we've
641 * processed the possible split char directly
642 * following the last field char; so if fieldsize=3
643 * and item="a b cdef", we consume "a b", not "a".
644 * Ditto further down.
645 */
646 if (size == fieldsize)
647 break;
648 }
649 else {
650 if (strchr(PL_chopset, *s)) {
651 /* provisional split point */
652 /* for a non-space split char, we include
653 * the split char; hence the '+1' */
654 chophere = s + 1;
655 itemsize = size;
656 }
657 if (size == fieldsize)
658 break;
659 if (!isCNTRL(*s))
660 gotsome = TRUE;
661 }
662
663 if (item_is_utf8)
664 s += UTF8SKIP(s);
665 else
077dbbf3 666 s++;
9b4bdfd4
DM		 667 size++;
668 }
669 if (!chophere || s == send) {
670 chophere = s;
671 itemsize = size;
672 }
673 itembytes = chophere - item;
674
5a34cab7 675 break;
a0d0e21e 676 }
a0d0e21e 677
4a73dc0b 678 case FF_SPACE: /* append padding space (diff of field, item size) */
a0d0e21e
LW		 679 arg = fieldsize - itemsize;
680 if (arg) {
681 fieldsize -= arg;
682 while (arg-- > 0)
683 *t++ = ' ';
684 }
685 break;
686
4a73dc0b 687 case FF_HALFSPACE: /* like FF_SPACE, but only append half as many */
a0d0e21e
LW		 688 arg = fieldsize - itemsize;
689 if (arg) {
690 arg /= 2;
691 fieldsize -= arg;
692 while (arg-- > 0)
693 *t++ = ' ';
694 }
695 break;
696
4a73dc0b 697 case FF_ITEM: /* append a text item, while blanking ctrl chars */
9b4bdfd4 698 to_copy = itembytes;
8aa7beb6
DM		 699 source = (U8 *)item;
700 trans = 1;
8aa7beb6 701 goto append;
a0d0e21e 702
4a73dc0b 703 case FF_CHOP: /* (for ^*) chop the current item */
fb9282c3 704 if (sv != &PL_sv_no) {
5a34cab7 705 const char *s = chophere;
86191aed
TC		 706 if (!copied_form &&
707 ((sv == tmpForm || SvSMAGICAL(sv))
708 || (SvGMAGICAL(tmpForm) && !sv_only_taint_gmagic(tmpForm))) ) {
709 /* sv and tmpForm are either the same SV, or magic might allow modification
710 of tmpForm when sv is modified, so copy */
711 SV *newformsv = sv_mortalcopy(formsv);
712 U32 *new_compiled;
713
714 f = SvPV_nolen(newformsv) + (f - SvPV_nolen(formsv));
715 Newx(new_compiled, mg->mg_len / sizeof(U32), U32);
716 memcpy(new_compiled, mg->mg_ptr, mg->mg_len);
717 SAVEFREEPV(new_compiled);
718 fpc = new_compiled + (fpc - (U32*)mg->mg_ptr);
719 formsv = newformsv;
720
92ff660b 721 copied_form = TRUE;
86191aed 722 }
5a34cab7 723 if (chopspace) {
af68e756 724 while (isSPACE(*s))
5a34cab7
NC		 725 s++;
726 }
9b4bdfd4
DM		 727 if (SvPOKp(sv))
728 sv_chop(sv,s);
729 else
730 /* tied, overloaded or similar strangeness.
731 * Do it the hard way */
732 sv_setpvn(sv, s, len - (s-item));
5a34cab7
NC		 733 SvSETMAGIC(sv);
734 break;
a0d0e21e 735 }
2165bd23 736 /* FALLTHROUGH */
a0d0e21e 737
4a73dc0b 738 case FF_LINESNGL: /* process ^* */
a1b95068 739 chopspace = 0;
c67159e1 740 /* FALLTHROUGH */
4a73dc0b
DM		 741
742 case FF_LINEGLOB: /* process @* */
5a34cab7 743 {
e32383e2 744 const bool oneline = fpc[-1] == FF_LINESNGL;
5a34cab7 745 const char *s = item = SvPV_const(sv, len);
7440a75b 746 const char *const send = s + len;
7440a75b 747
f3f2f1a3 748 item_is_utf8 = DO_UTF8(sv);
fb9282c3 749 chophere = s + len;
a1137ee5 750 if (!len)
7440a75b 751 break;
ea60cfe8 752 trans = 0;
0d21cefe 753 gotsome = TRUE;
4ff700b9
DM		 754 source = (U8 *) s;
755 to_copy = len;
0d21cefe
DM		 756 while (s < send) {
757 if (*s++ == '\n') {
758 if (oneline) {
9b4bdfd4 759 to_copy = s - item - 1;
0d21cefe
DM		 760 chophere = s;
761 break;
762 } else {
763 if (s == send) {
0d21cefe
DM		 764 to_copy--;
765 } else
766 lines++;
1bd51a4c 767 }
a0d0e21e 768 }
0d21cefe 769 }
a2c0032b
DM		 770 }
771
ea60cfe8
DM		 772 append:
773 /* append to_copy bytes from source to PL_formstring.
774 * item_is_utf8 implies source is utf8.
775 * if trans, translate certain characters during the copy */
a2c0032b
DM		 776 {
777 U8 *tmp = NULL;
732f08da 778 STRLEN grow = 0;
0325ce87 779
732f08da
DM		 780 SvCUR_set(PL_formtarget,
781 t - SvPVX_const(PL_formtarget));
0325ce87 782
0d21cefe
DM		 783 if (targ_is_utf8 && !item_is_utf8) {
784 source = tmp = bytes_to_utf8(source, &to_copy);
732f08da 785 grow = to_copy;
0d21cefe
DM		 786 } else {
787 if (item_is_utf8 && !targ_is_utf8) {
f5ada144 788 U8 *s;
0d21cefe 789 /* Upgrade targ to UTF8, and then we reduce it to
0325ce87
DM		 790 a problem we have a simple solution for.
791 Don't need get magic. */
0d21cefe 792 sv_utf8_upgrade_nomg(PL_formtarget);
0325ce87 793 targ_is_utf8 = TRUE;
f5ada144
DM		 794 /* re-calculate linemark */
795 s = (U8*)SvPVX(PL_formtarget);
732f08da
DM		 796 /* the bytes we initially allocated to append the
797 * whole line may have been gobbled up during the
798 * upgrade, so allocate a whole new line's worth
799 * for safety */
800 grow = linemax;
f5ada144 801 while (linemark--)
40c725d1
KW		 802 s += UTF8_SAFE_SKIP(s,
803 (U8 *) SvEND(PL_formtarget));
f5ada144 804 linemark = s - (U8*)SvPVX(PL_formtarget);
e8e72d41 805 }
0d21cefe
DM		 806 /* Easy. They agree. */
807 assert (item_is_utf8 == targ_is_utf8);
808 }
732f08da
DM		 809 if (!trans)
810 /* @* and ^* are the only things that can exceed
811 * the linemax, so grow by the output size, plus
812 * a whole new form's worth in case of any further
813 * output */
814 grow = linemax + to_copy;
815 if (grow)
816 SvGROW(PL_formtarget, SvCUR(PL_formtarget) + grow + 1);
817 t = SvPVX(PL_formtarget) + SvCUR(PL_formtarget);
0d21cefe
DM		 818
819 Copy(source, t, to_copy, char);
ea60cfe8 820 if (trans) {
8aa7beb6
DM		 821 /* blank out ~ or control chars, depending on trans.
822 * works on bytes not chars, so relies on not
823 * matching utf8 continuation bytes */
ea60cfe8
DM		 824 U8 *s = (U8*)t;
825 U8 *send = s + to_copy;
826 while (s < send) {
8aa7beb6 827 const int ch = *s;
077dbbf3 828 if (trans == '~' ? (ch == '~') : isCNTRL(ch))
ea60cfe8
DM		 829 *s = ' ';
830 s++;
831 }
832 }
833
0d21cefe 834 t += to_copy;
732f08da 835 SvCUR_set(PL_formtarget, SvCUR(PL_formtarget) + to_copy);
a1137ee5 836 if (tmp)
0d21cefe 837 Safefree(tmp);
5a34cab7 838 break;
a0d0e21e 839 }
a0d0e21e 840
4a73dc0b 841 case FF_0DECIMAL: /* like FF_DECIMAL but for 0### */
a0d0e21e 842 arg = *fpc++;
bd7084a6 843 fmt = (const char *)
a029fa42 844 ((arg & FORM_NUM_POINT) ? "%#0*.*" NVff : "%0*.*" NVff);
bd7084a6 845 goto ff_dec;
5d37acd6 846
bd7084a6
DM		 847 case FF_DECIMAL: /* do @##, ^##, where <arg>=(precision|flags) */
848 arg = *fpc++;
bd7084a6 849 fmt = (const char *)
a029fa42 850 ((arg & FORM_NUM_POINT) ? "%#*.*" NVff : "%*.*" NVff);
bd7084a6 851 ff_dec:
784707d5
JP		 852 /* If the field is marked with ^ and the value is undefined,
853 blank it out. */
a701009a 854 if ((arg & FORM_NUM_BLANK) && !SvOK(sv)) {
784707d5
JP		 855 arg = fieldsize;
856 while (arg--)
857 *t++ = ' ';
858 break;
859 }
860 gotsome = TRUE;
861 value = SvNV(sv);
a1b95068 862 /* overflow evidence */
bfed75c6 863 if (num_overflow(value, fieldsize, arg)) {
a1b95068
LW		 864 arg = fieldsize;
865 while (arg--)
866 *t++ = '#';
867 break;
868 }
784707d5
JP		 869 /* Formats aren't yet marked for locales, so assume "yes". */
870 {
e8549682
JH		 871 Size_t max = SvLEN(PL_formtarget) - (t - SvPVX(PL_formtarget));
872 int len;
67d796ae
KW		 873 DECLARATION_FOR_LC_NUMERIC_MANIPULATION;
874 STORE_LC_NUMERIC_SET_TO_NEEDED();
51f14a05 875 arg &= ~(FORM_NUM_POINT|FORM_NUM_BLANK);
a4eca1d4
JH		 876#ifdef USE_QUADMATH
877 {
878 const char* qfmt = quadmath_format_single(fmt);
879 int len;
880 if (!qfmt)
881 Perl_croak_nocontext("panic: quadmath invalid format \"%s\"", fmt);
882 len = quadmath_snprintf(t, max, qfmt, (int) fieldsize, (int) arg, value);
883 if (len == -1)
884 Perl_croak_nocontext("panic: quadmath_snprintf failed, format \"%s\"", qfmt);
885 if (qfmt != fmt)
886 Safefree(fmt);
887 }
888#else
b587c0e8 889 /* we generate fmt ourselves so it is safe */
7347ee54 890 GCC_DIAG_IGNORE_STMT(-Wformat-nonliteral);
e8549682 891 len = my_snprintf(t, max, fmt, (int) fieldsize, (int) arg, value);
7347ee54 892 GCC_DIAG_RESTORE_STMT;
a4eca1d4
JH		 893#endif
894 PERL_MY_SNPRINTF_POST_GUARD(len, max);
a2287a13 895 RESTORE_LC_NUMERIC();
784707d5
JP		 896 }
897 t += fieldsize;
898 break;
a1b95068 899
4a73dc0b 900 case FF_NEWLINE: /* delete trailing spaces, then append \n */
a0d0e21e 901 f++;
732f08da 902 while (t-- > (SvPVX(PL_formtarget) + linemark) && *t == ' ') ;
a0d0e21e
LW		 903 t++;
904 *t++ = '\n';
905 break;
906
4a73dc0b 907 case FF_BLANK: /* for arg==0: do '~'; for arg>0 : do '~~' */
a0d0e21e
LW		 908 arg = *fpc++;
909 if (gotsome) {
910 if (arg) { /* repeat until fields exhausted? */
11f9eeaf
DM		 911 fpc--;
912 goto end;
a0d0e21e
LW		 913 }
914 }
915 else {
f5ada144 916 t = SvPVX(PL_formtarget) + linemark;
a0d0e21e
LW		 917 lines--;
918 }
919 break;
920
4a73dc0b 921 case FF_MORE: /* replace long end of string with '...' */
5a34cab7
NC		 922 {
923 const char *s = chophere;
924 const char *send = item + len;
925 if (chopspace) {
af68e756 926 while (isSPACE(*s) && (s < send))
5a34cab7 927 s++;
a0d0e21e 928 }
5a34cab7
NC		 929 if (s < send) {
930 char *s1;
931 arg = fieldsize - itemsize;
932 if (arg) {
933 fieldsize -= arg;
934 while (arg-- > 0)
935 *t++ = ' ';
936 }
937 s1 = t - 3;
f55ac4a4 938 if (strBEGINs(s1," ")) {
5a34cab7
NC		 939 while (s1 > SvPVX_const(PL_formtarget) && isSPACE(s1[-1]))
940 s1--;
941 }
942 *s1++ = '.';
943 *s1++ = '.';
944 *s1++ = '.';
a0d0e21e 945 }
5a34cab7 946 break;
a0d0e21e 947 }
4a73dc0b
DM		 948
949 case FF_END: /* tidy up, then return */
11f9eeaf 950 end:
bf2bec63 951 assert(t < SvPVX_const(PL_formtarget) + SvLEN(PL_formtarget));
a0d0e21e 952 *t = '\0';
b15aece3 953 SvCUR_set(PL_formtarget, t - SvPVX_const(PL_formtarget));
1bd51a4c
IH		 954 if (targ_is_utf8)
955 SvUTF8_on(PL_formtarget);
3280af22 956 FmLINES(PL_formtarget) += lines;
a0d0e21e 957 SP = ORIGMARK;
11f9eeaf
DM		 958 if (fpc[-1] == FF_BLANK)
959 RETURNOP(cLISTOP->op_first);
960 else
961 RETPUSHYES;
a0d0e21e
LW		 962 }
963 }
964}
965
10088f56 966/* also used for: pp_mapstart() */
a0d0e21e
LW		 967PP(pp_grepstart)
968{
20b7effb 969 dSP;
a0d0e21e
LW		 970 SV *src;
971
6cae08a8 972 if (PL_stack_base + TOPMARK == SP) {
a0d0e21e 973 (void)POPMARK;
54310121 974 if (GIMME_V == G_SCALAR)
725c44f9 975 XPUSHs(&PL_sv_zero);
533c011a 976 RETURNOP(PL_op->op_next->op_next);
a0d0e21e 977 }
6cae08a8 978 PL_stack_sp = PL_stack_base + TOPMARK + 1;
897d3989
NC		 979 Perl_pp_pushmark(aTHX); /* push dst */
980 Perl_pp_pushmark(aTHX); /* push src */
d343c3ef 981 ENTER_with_name("grep"); /* enter outer scope */
a0d0e21e
LW		 982
983 SAVETMPS;
ffd49c98 984 SAVE_DEFSV;
d343c3ef 985 ENTER_with_name("grep_item"); /* enter inner scope */
7766f137 986 SAVEVPTR(PL_curpm);
a0d0e21e 987
6cae08a8 988 src = PL_stack_base[TOPMARK];
60779a30 989 if (SvPADTMP(src)) {
6cae08a8 990 src = PL_stack_base[TOPMARK] = sv_mortalcopy(src);
a0ed822e
FC		 991 PL_tmps_floor++;
992 }
a0d0e21e 993 SvTEMP_off(src);
ffd49c98 994 DEFSV_set(src);
a0d0e21e
LW		 995
996 PUTBACK;
533c011a 997 if (PL_op->op_type == OP_MAPSTART)
897d3989 998 Perl_pp_pushmark(aTHX); /* push top */
533c011a 999 return ((LOGOP*)PL_op->op_next)->op_other;
a0d0e21e
LW		 1000}
1001
a0d0e21e
LW		 1002PP(pp_mapwhile)
1003{
20b7effb 1004 dSP;
1c23e2bd 1005 const U8 gimme = GIMME_V;
6cae08a8 1006 I32 items = (SP - PL_stack_base) - TOPMARK; /* how many new items */
a0d0e21e
LW		 1007 I32 count;
1008 I32 shift;
1009 SV** src;
ac27b0f5 1010 SV** dst;
a0d0e21e 1011
544f3153 1012 /* first, move source pointer to the next item in the source list */
3280af22 1013 ++PL_markstack_ptr[-1];
544f3153
GS		 1014
1015 /* if there are new items, push them into the destination list */
4c90a460 1016 if (items && gimme != G_VOID) {
544f3153
GS		 1017 /* might need to make room back there first */
1018 if (items > PL_markstack_ptr[-1] - PL_markstack_ptr[-2]) {
1019 /* XXX this implementation is very pessimal because the stack
1020 * is repeatedly extended for every set of items. Is possible
1021 * to do this without any stack extension or copying at all
1022 * by maintaining a separate list over which the map iterates
18ef8bea 1023 * (like foreach does). --gsar */
544f3153
GS		 1024
1025 /* everything in the stack after the destination list moves
1026 * towards the end the stack by the amount of room needed */
1027 shift = items - (PL_markstack_ptr[-1] - PL_markstack_ptr[-2]);
1028
1029 /* items to shift up (accounting for the moved source pointer) */
1030 count = (SP - PL_stack_base) - (PL_markstack_ptr[-1] - 1);
18ef8bea
BT		 1031
1032 /* This optimization is by Ben Tilly and it does
1033 * things differently from what Sarathy (gsar)
1034 * is describing. The downside of this optimization is
1035 * that leaves "holes" (uninitialized and hopefully unused areas)
1036 * to the Perl stack, but on the other hand this
1037 * shouldn't be a problem. If Sarathy's idea gets
1038 * implemented, this optimization should become
1039 * irrelevant. --jhi */
1040 if (shift < count)
1041 shift = count; /* Avoid shifting too often --Ben Tilly */
bfed75c6 1042
924508f0
GS		 1043 EXTEND(SP,shift);
1044 src = SP;
1045 dst = (SP += shift);
3280af22
NIS		 1046 PL_markstack_ptr[-1] += shift;
1047 *PL_markstack_ptr += shift;
544f3153 1048 while (count--)
a0d0e21e
LW		 1049 *dst-- = *src--;
1050 }
544f3153 1051 /* copy the new items down to the destination list */
ac27b0f5 1052 dst = PL_stack_base + (PL_markstack_ptr[-2] += items) - 1;
22023b26 1053 if (gimme == G_ARRAY) {
b2a2a901
DM		 1054 /* add returned items to the collection (making mortal copies
1055 * if necessary), then clear the current temps stack frame
1056 * *except* for those items. We do this splicing the items
1057 * into the start of the tmps frame (so some items may be on
59d53fd6 1058 * the tmps stack twice), then moving PL_tmps_floor above
b2a2a901
DM		 1059 * them, then freeing the frame. That way, the only tmps that
1060 * accumulate over iterations are the return values for map.
1061 * We have to do to this way so that everything gets correctly
1062 * freed if we die during the map.
1063 */
1064 I32 tmpsbase;
1065 I32 i = items;
1066 /* make space for the slice */
1067 EXTEND_MORTAL(items);
1068 tmpsbase = PL_tmps_floor + 1;
1069 Move(PL_tmps_stack + tmpsbase,
1070 PL_tmps_stack + tmpsbase + items,
1071 PL_tmps_ix - PL_tmps_floor,
1072 SV*);
1073 PL_tmps_ix += items;
1074
1075 while (i-- > 0) {
1076 SV *sv = POPs;
1077 if (!SvTEMP(sv))
1078 sv = sv_mortalcopy(sv);
1079 *dst-- = sv;
1080 PL_tmps_stack[tmpsbase++] = SvREFCNT_inc_simple(sv);
1081 }
1082 /* clear the stack frame except for the items */
1083 PL_tmps_floor += items;
1084 FREETMPS;
1085 /* FREETMPS may have cleared the TEMP flag on some of the items */
1086 i = items;
1087 while (i-- > 0)
1088 SvTEMP_on(PL_tmps_stack[--tmpsbase]);
22023b26 1089 }
bfed75c6 1090 else {
22023b26
TP		 1091 /* scalar context: we don't care about which values map returns
1092 * (we use undef here). And so we certainly don't want to do mortal
1093 * copies of meaningless values. */
1094 while (items-- > 0) {
b988aa42 1095 (void)POPs;
22023b26
TP		 1096 *dst-- = &PL_sv_undef;
1097 }
b2a2a901 1098 FREETMPS;
22023b26 1099 }
a0d0e21e 1100 }
b2a2a901
DM		 1101 else {
1102 FREETMPS;
1103 }
d343c3ef 1104 LEAVE_with_name("grep_item"); /* exit inner scope */
a0d0e21e
LW		 1105
1106 /* All done yet? */
6cae08a8 1107 if (PL_markstack_ptr[-1] > TOPMARK) {
a0d0e21e
LW		 1108
1109 (void)POPMARK; /* pop top */
d343c3ef 1110 LEAVE_with_name("grep"); /* exit outer scope */
a0d0e21e 1111 (void)POPMARK; /* pop src */
3280af22 1112 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
a0d0e21e 1113 (void)POPMARK; /* pop dst */
3280af22 1114 SP = PL_stack_base + POPMARK; /* pop original mark */
54310121 1115 if (gimme == G_SCALAR) {
7cc47870
RGS		 1116 dTARGET;
1117 XPUSHi(items);
a0d0e21e 1118 }
54310121
PP		 1119 else if (gimme == G_ARRAY)
1120 SP += items;
a0d0e21e
LW		 1121 RETURN;
1122 }
1123 else {
1124 SV *src;
1125
d343c3ef 1126 ENTER_with_name("grep_item"); /* enter inner scope */
7766f137 1127 SAVEVPTR(PL_curpm);
a0d0e21e 1128
544f3153 1129 /* set $_ to the new source item */
3280af22 1130 src = PL_stack_base[PL_markstack_ptr[-1]];
60779a30 1131 if (SvPADTMP(src)) {
60779a30
DM		 1132 src = sv_mortalcopy(src);
1133 }
a0d0e21e 1134 SvTEMP_off(src);
ffd49c98 1135 DEFSV_set(src);
a0d0e21e
LW		 1136
1137 RETURNOP(cLOGOP->op_other);
1138 }
1139}
1140
a0d0e21e
LW		 1141/* Range stuff. */
1142
1143PP(pp_range)
1144{
f4c975aa 1145 dTARG;
82334630 1146 if (GIMME_V == G_ARRAY)
1a67a97c 1147 return NORMAL;
f4c975aa
DM		 1148 GETTARGET;
1149 if (SvTRUE_NN(targ))
1a67a97c 1150 return cLOGOP->op_other;
538573f7 1151 else
1a67a97c 1152 return NORMAL;
a0d0e21e
LW		 1153}
1154
1155PP(pp_flip)
1156{
39644a26 1157 dSP;
a0d0e21e 1158
82334630 1159 if (GIMME_V == G_ARRAY) {
1a67a97c 1160 RETURNOP(((LOGOP*)cUNOP->op_first)->op_other);
a0d0e21e
LW		 1161 }
1162 else {
1163 dTOPss;
44f8325f 1164 SV * const targ = PAD_SV(PL_op->op_targ);
bfed75c6 1165 int flip = 0;
790090df 1166
bfed75c6 1167 if (PL_op->op_private & OPpFLIP_LINENUM) {
4e3399f9
YST		 1168 if (GvIO(PL_last_in_gv)) {
1169 flip = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
1170 }
1171 else {
fafc274c 1172 GV * const gv = gv_fetchpvs(".", GV_ADD|GV_NOTQUAL, SVt_PV);
44f8325f
AL		 1173 if (gv && GvSV(gv))
1174 flip = SvIV(sv) == SvIV(GvSV(gv));
4e3399f9 1175 }
bfed75c6 1176 } else {
f4c975aa 1177 flip = SvTRUE_NN(sv);
bfed75c6
AL		 1178 }
1179 if (flip) {
a0d0e21e 1180 sv_setiv(PAD_SV(cUNOP->op_first->op_targ), 1);
533c011a 1181 if (PL_op->op_flags & OPf_SPECIAL) {
a0d0e21e 1182 sv_setiv(targ, 1);
3e3baf6d 1183 SETs(targ);
a0d0e21e
LW		 1184 RETURN;
1185 }
1186 else {
1187 sv_setiv(targ, 0);
924508f0 1188 SP--;
1a67a97c 1189 RETURNOP(((LOGOP*)cUNOP->op_first)->op_other);
a0d0e21e
LW		 1190 }
1191 }
9aa3b533 1192 SvPVCLEAR(TARG);
a0d0e21e
LW		 1193 SETs(targ);
1194 RETURN;
1195 }
1196}
1197
8e9bbdb9 1198/* This code tries to decide if "$left .. $right" should use the
d1bc97fe
H		 1199 magical string increment, or if the range is numeric. Initially,
1200 an exception was made for *any* string beginning with "0" (see
1201 [#18165], AMS 20021031), but now that is only applied when the
1202 string's length is also >1 - see the rules now documented in
1203 perlop [#133695] */
8e9bbdb9
RGS		 1204
1205#define RANGE_IS_NUMERIC(left,right) ( \
b0e74086
RGS		 1206 SvNIOKp(left) || (SvOK(left) && !SvPOKp(left)) || \
1207 SvNIOKp(right) || (SvOK(right) && !SvPOKp(right)) || \
e0ab1c0e 1208 (((!SvOK(left) && SvOK(right)) || ((!SvOK(left) || \
d1bc97fe
H		 1209 looks_like_number(left)) && SvPOKp(left) \
1210 && !(*SvPVX_const(left) == '0' && SvCUR(left)>1 ) )) \
e0ab1c0e 1211 && (!SvOK(right) || looks_like_number(right))))
8e9bbdb9 1212
a0d0e21e
LW		 1213PP(pp_flop)
1214{
20b7effb 1215 dSP;
a0d0e21e 1216
82334630 1217 if (GIMME_V == G_ARRAY) {
a0d0e21e 1218 dPOPPOPssrl;
86cb7173 1219
5b295bef
RD		 1220 SvGETMAGIC(left);
1221 SvGETMAGIC(right);
a0d0e21e 1222
8e9bbdb9 1223 if (RANGE_IS_NUMERIC(left,right)) {
b262c4c9 1224 IV i, j, n;
4d91eccc
FC		 1225 if ((SvOK(left) && !SvIOK(left) && SvNV_nomg(left) < IV_MIN) ||
1226 (SvOK(right) && (SvIOK(right)
1227 ? SvIsUV(right) && SvUV(right) > IV_MAX
1228 : SvNV_nomg(right) > IV_MAX)))
d470f89e 1229 DIE(aTHX_ "Range iterator outside integer range");
f52e41ad 1230 i = SvIV_nomg(left);
b262c4c9
JH		 1231 j = SvIV_nomg(right);
1232 if (j >= i) {
1233 /* Dance carefully around signed max. */
1234 bool overflow = (i <= 0 && j > SSize_t_MAX + i - 1);
1235 if (!overflow) {
1236 n = j - i + 1;
1237 /* The wraparound of signed integers is undefined
1238 * behavior, but here we aim for count >=1, and
1239 * negative count is just wrong. */
a1e27170
TC		 1240 if (n < 1
1241#if IVSIZE > Size_t_size
1242 || n > SSize_t_MAX
1243#endif
1244 )
b262c4c9
JH		 1245 overflow = TRUE;
1246 }
1247 if (overflow)
1248 Perl_croak(aTHX_ "Out of memory during list extend");
1249 EXTEND_MORTAL(n);
1250 EXTEND(SP, n);
bbce6d69 1251 }
c1ab3db2 1252 else
b262c4c9
JH		 1253 n = 0;
1254 while (n--) {
fc01cab4 1255 SV * const sv = sv_2mortal(newSViv(i));
a0d0e21e 1256 PUSHs(sv);
fc01cab4
DM		 1257 if (n) /* avoid incrementing above IV_MAX */
1258 i++;
a0d0e21e
LW		 1259 }
1260 }
1261 else {
3c323193
FC		 1262 STRLEN len, llen;
1263 const char * const lpv = SvPV_nomg_const(left, llen);
f52e41ad 1264 const char * const tmps = SvPV_nomg_const(right, len);
a0d0e21e 1265
3c323193 1266 SV *sv = newSVpvn_flags(lpv, llen, SvUTF8(left)|SVs_TEMP);
d6c970c7
AC		 1267 if (DO_UTF8(right) && IN_UNI_8_BIT)
1268 len = sv_len_utf8_nomg(right);
89ea2908 1269 while (!SvNIOKp(sv) && SvCUR(sv) <= len) {
a0d0e21e 1270 XPUSHs(sv);
b15aece3 1271 if (strEQ(SvPVX_const(sv),tmps))
89ea2908 1272 break;
a0d0e21e
LW		 1273 sv = sv_2mortal(newSVsv(sv));
1274 sv_inc(sv);
1275 }
a0d0e21e
LW		 1276 }
1277 }
1278 else {
1279 dTOPss;
901017d6 1280 SV * const targ = PAD_SV(cUNOP->op_first->op_targ);
4e3399f9 1281 int flop = 0;
a0d0e21e 1282 sv_inc(targ);
4e3399f9
YST		 1283
1284 if (PL_op->op_private & OPpFLIP_LINENUM) {
1285 if (GvIO(PL_last_in_gv)) {
1286 flop = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
1287 }
1288 else {
fafc274c 1289 GV * const gv = gv_fetchpvs(".", GV_ADD|GV_NOTQUAL, SVt_PV);
4e3399f9
YST		 1290 if (gv && GvSV(gv)) flop = SvIV(sv) == SvIV(GvSV(gv));
1291 }
1292 }
1293 else {
f4c975aa 1294 flop = SvTRUE_NN(sv);
4e3399f9
YST		 1295 }
1296
1297 if (flop) {
a0d0e21e 1298 sv_setiv(PAD_SV(((UNOP*)cUNOP->op_first)->op_first->op_targ), 0);
396482e1 1299 sv_catpvs(targ, "E0");
a0d0e21e
LW		 1300 }
1301 SETs(targ);
1302 }
1303
1304 RETURN;
1305}
1306
1307/* Control. */
1308
27da23d5 1309static const char * const context_name[] = {
515afda2 1310 "pseudo-block",
7896dde7 1311 NULL, /* CXt_WHEN never actually needs "block" */
76753e7f 1312 NULL, /* CXt_BLOCK never actually needs "block" */
7896dde7 1313 NULL, /* CXt_GIVEN never actually needs "block" */
76753e7f 1314 NULL, /* CXt_LOOP_PLAIN never actually needs "loop" */
76753e7f 1315 NULL, /* CXt_LOOP_LAZYIV never actually needs "loop" */
93661e56
DM		 1316 NULL, /* CXt_LOOP_LAZYSV never actually needs "loop" */
1317 NULL, /* CXt_LOOP_LIST never actually needs "loop" */
1318 NULL, /* CXt_LOOP_ARY never actually needs "loop" */
515afda2 1319 "subroutine",
76753e7f 1320 "format",
515afda2 1321 "eval",
515afda2 1322 "substitution",
515afda2
NC		 1323};
1324
76e3520e 1325STATIC I32
5db1eb8d 1326S_dopoptolabel(pTHX_ const char *label, STRLEN len, U32 flags)
a0d0e21e 1327{
eb578fdb 1328 I32 i;
a0d0e21e 1329
7918f24d
NC		 1330 PERL_ARGS_ASSERT_DOPOPTOLABEL;
1331
a0d0e21e 1332 for (i = cxstack_ix; i >= 0; i--) {
eb578fdb 1333 const PERL_CONTEXT * const cx = &cxstack[i];
6b35e009 1334 switch (CxTYPE(cx)) {
a0d0e21e 1335 case CXt_SUBST:
a0d0e21e 1336 case CXt_SUB:
7766f137 1337 case CXt_FORMAT:
a0d0e21e 1338 case CXt_EVAL:
0a753a76 1339 case CXt_NULL:
dcbac5bb 1340 /* diag_listed_as: Exiting subroutine via %s */
a2a5de95
NC		 1341 Perl_ck_warner(aTHX_ packWARN(WARN_EXITING), "Exiting %s via %s",
1342 context_name[CxTYPE(cx)], OP_NAME(PL_op));
79646418 1343 if (CxTYPE(cx) == CXt_NULL) /* sort BLOCK */
515afda2
NC		 1344 return -1;
1345 break;
93661e56 1346 case CXt_LOOP_PLAIN:
c6fdafd0 1347 case CXt_LOOP_LAZYIV:
d01136d6 1348 case CXt_LOOP_LAZYSV:
93661e56
DM		 1349 case CXt_LOOP_LIST:
1350 case CXt_LOOP_ARY:
7e8f1eac 1351 {
5db1eb8d
BF		 1352 STRLEN cx_label_len = 0;
1353 U32 cx_label_flags = 0;
1354 const char *cx_label = CxLABEL_len_flags(cx, &cx_label_len, &cx_label_flags);
1355 if (!cx_label || !(
1356 ( (cx_label_flags & SVf_UTF8) != (flags & SVf_UTF8) ) ?
1357 (flags & SVf_UTF8)
1358 ? (bytes_cmp_utf8(
1359 (const U8*)cx_label, cx_label_len,
1360 (const U8*)label, len) == 0)
1361 : (bytes_cmp_utf8(
1362 (const U8*)label, len,
1363 (const U8*)cx_label, cx_label_len) == 0)
eade7155
BF		 1364 : (len == cx_label_len && ((cx_label == label)
1365 || memEQ(cx_label, label, len))) )) {
1c98cc53 1366 DEBUG_l(Perl_deb(aTHX_ "(poptolabel(): skipping label at cx=%ld %s)\n",
7e8f1eac 1367 (long)i, cx_label));
a0d0e21e
LW		 1368 continue;
1369 }
1c98cc53 1370 DEBUG_l( Perl_deb(aTHX_ "(poptolabel(): found label at cx=%ld %s)\n", (long)i, label));
a0d0e21e 1371 return i;
7e8f1eac 1372 }
a0d0e21e
LW		 1373 }
1374 }
1375 return i;
1376}
1377
0d863452
RH		 1378
1379
1c23e2bd 1380U8
864dbfa3 1381Perl_dowantarray(pTHX)
e50aee73 1382{
1c23e2bd 1383 const U8 gimme = block_gimme();
54310121
PP		 1384 return (gimme == G_VOID) ? G_SCALAR : gimme;
1385}
1386
1c23e2bd 1387U8
864dbfa3 1388Perl_block_gimme(pTHX)
54310121 1389{
20ef288c 1390 const I32 cxix = dopoptosub(cxstack_ix);
a05700a8 1391 U8 gimme;
e50aee73 1392 if (cxix < 0)
46fc3d4c 1393 return G_VOID;
e50aee73 1394
a05700a8
DM		 1395 gimme = (cxstack[cxix].blk_gimme & G_WANT);
1396 if (!gimme)
1397 Perl_croak(aTHX_ "panic: bad gimme: %d\n", gimme);
1398 return gimme;
e50aee73
AD		 1399}
1400
a05700a8 1401
78f9721b
SM		 1402I32
1403Perl_is_lvalue_sub(pTHX)
1404{
20ef288c 1405 const I32 cxix = dopoptosub(cxstack_ix);
78f9721b
SM		 1406 assert(cxix >= 0); /* We should only be called from inside subs */
1407
bafb2adc
NC		 1408 if (CxLVAL(cxstack + cxix) && CvLVALUE(cxstack[cxix].blk_sub.cv))
1409 return CxLVAL(cxstack + cxix);
78f9721b
SM		 1410 else
1411 return 0;
1412}
1413
a73d8813 1414/* only used by cx_pushsub() */
777d9014
FC		 1415I32
1416Perl_was_lvalue_sub(pTHX)
1417{
777d9014
FC		 1418 const I32 cxix = dopoptosub(cxstack_ix-1);
1419 assert(cxix >= 0); /* We should only be called from inside subs */
1420
1421 if (CxLVAL(cxstack + cxix) && CvLVALUE(cxstack[cxix].blk_sub.cv))
1422 return CxLVAL(cxstack + cxix);
1423 else
1424 return 0;
1425}
1426
76e3520e 1427STATIC I32
901017d6 1428S_dopoptosub_at(pTHX_ const PERL_CONTEXT *cxstk, I32 startingblock)
2c375eb9 1429{
a0d0e21e 1430 I32 i;
7918f24d
NC		 1431
1432 PERL_ARGS_ASSERT_DOPOPTOSUB_AT;
81611534
JH		 1433#ifndef DEBUGGING
1434 PERL_UNUSED_CONTEXT;
1435#endif
7918f24d 1436
a0d0e21e 1437 for (i = startingblock; i >= 0; i--) {
eb578fdb 1438 const PERL_CONTEXT * const cx = &cxstk[i];
6b35e009 1439 switch (CxTYPE(cx)) {
a0d0e21e
LW		 1440 default:
1441 continue;
a0d0e21e 1442 case CXt_SUB:
5fbe8311
DM		 1443 /* in sub foo { /(?{...})/ }, foo ends up on the CX stack
1444 * twice; the first for the normal foo() call, and the second
1445 * for a faked up re-entry into the sub to execute the
1446 * code block. Hide this faked entry from the world. */
1447 if (cx->cx_type & CXp_SUB_RE_FAKE)
1448 continue;
c67159e1 1449 /* FALLTHROUGH */
5fbe8311 1450 case CXt_EVAL:
7766f137 1451 case CXt_FORMAT:
1c98cc53 1452 DEBUG_l( Perl_deb(aTHX_ "(dopoptosub_at(): found sub at cx=%ld)\n", (long)i));
a0d0e21e
LW		 1453 return i;
1454 }
1455 }
1456 return i;
1457}
1458
76e3520e 1459STATIC I32
cea2e8a9 1460S_dopoptoeval(pTHX_ I32 startingblock)
a0d0e21e
LW		 1461{
1462 I32 i;
a0d0e21e 1463 for (i = startingblock; i >= 0; i--) {
eb578fdb 1464 const PERL_CONTEXT *cx = &cxstack[i];
6b35e009 1465 switch (CxTYPE(cx)) {
a0d0e21e
LW		 1466 default:
1467 continue;
1468 case CXt_EVAL:
1c98cc53 1469 DEBUG_l( Perl_deb(aTHX_ "(dopoptoeval(): found eval at cx=%ld)\n", (long)i));
a0d0e21e
LW		 1470 return i;
1471 }
1472 }
1473 return i;
1474}
1475
76e3520e 1476STATIC I32
cea2e8a9 1477S_dopoptoloop(pTHX_ I32 startingblock)
a0d0e21e
LW		 1478{
1479 I32 i;
a0d0e21e 1480 for (i = startingblock; i >= 0; i--) {
eb578fdb 1481 const PERL_CONTEXT * const cx = &cxstack[i];
6b35e009 1482 switch (CxTYPE(cx)) {
a0d0e21e 1483 case CXt_SUBST:
a0d0e21e 1484 case CXt_SUB:
7766f137 1485 case CXt_FORMAT:
a0d0e21e 1486 case CXt_EVAL:
0a753a76 1487 case CXt_NULL:
dcbac5bb 1488 /* diag_listed_as: Exiting subroutine via %s */
a2a5de95
NC		 1489 Perl_ck_warner(aTHX_ packWARN(WARN_EXITING), "Exiting %s via %s",
1490 context_name[CxTYPE(cx)], OP_NAME(PL_op));
79646418 1491 if ((CxTYPE(cx)) == CXt_NULL) /* sort BLOCK */
515afda2
NC		 1492 return -1;
1493 break;
93661e56 1494 case CXt_LOOP_PLAIN:
c6fdafd0 1495 case CXt_LOOP_LAZYIV:
d01136d6 1496 case CXt_LOOP_LAZYSV:
93661e56
DM		 1497 case CXt_LOOP_LIST:
1498 case CXt_LOOP_ARY:
1c98cc53 1499 DEBUG_l( Perl_deb(aTHX_ "(dopoptoloop(): found loop at cx=%ld)\n", (long)i));
a0d0e21e
LW		 1500 return i;
1501 }
1502 }
1503 return i;
1504}
1505
7896dde7
Z		 1506/* find the next GIVEN or FOR (with implicit $_) loop context block */
1507
1508STATIC I32
1509S_dopoptogivenfor(pTHX_ I32 startingblock)
1510{
1511 I32 i;
1512 for (i = startingblock; i >= 0; i--) {
1513 const PERL_CONTEXT *cx = &cxstack[i];
1514 switch (CxTYPE(cx)) {
1515 default:
1516 continue;
1517 case CXt_GIVEN:
1518 DEBUG_l( Perl_deb(aTHX_ "(dopoptogivenfor(): found given at cx=%ld)\n", (long)i));
1519 return i;
1520 case CXt_LOOP_PLAIN:
1521 assert(!(cx->cx_type & CXp_FOR_DEF));
1522 break;
1523 case CXt_LOOP_LAZYIV:
1524 case CXt_LOOP_LAZYSV:
1525 case CXt_LOOP_LIST:
1526 case CXt_LOOP_ARY:
1527 if (cx->cx_type & CXp_FOR_DEF) {
1528 DEBUG_l( Perl_deb(aTHX_ "(dopoptogivenfor(): found foreach at cx=%ld)\n", (long)i));
1529 return i;
1530 }
1531 }
1532 }
1533 return i;
1534}
1535
0d863452 1536STATIC I32
7896dde7 1537S_dopoptowhen(pTHX_ I32 startingblock)
0d863452
RH		 1538{
1539 I32 i;
1540 for (i = startingblock; i >= 0; i--) {
eb578fdb 1541 const PERL_CONTEXT *cx = &cxstack[i];
0d863452
RH		 1542 switch (CxTYPE(cx)) {
1543 default:
1544 continue;
7896dde7
Z		 1545 case CXt_WHEN:
1546 DEBUG_l( Perl_deb(aTHX_ "(dopoptowhen(): found when at cx=%ld)\n", (long)i));
0d863452
RH		 1547 return i;
1548 }
1549 }
1550 return i;
1551}
1552
abaf5d5a 1553/* dounwind(): pop all contexts above (but not including) cxix.
fc6e609e
DM		 1554 * Note that it clears the savestack frame associated with each popped
1555 * context entry, but doesn't free any temps.
ed8ff0f3 1556 * It does a cx_popblock() of the last frame that it pops, and leaves
fc6e609e 1557 * cxstack_ix equal to cxix.
abaf5d5a
DM		 1558 */
1559
a0d0e21e 1560void
864dbfa3 1561Perl_dounwind(pTHX_ I32 cxix)
a0d0e21e 1562{
f144f1e3
DM		 1563 if (!PL_curstackinfo) /* can happen if die during thread cloning */
1564 return;
1565
a0d0e21e 1566 while (cxstack_ix > cxix) {
4ebe6e95 1567 PERL_CONTEXT *cx = CX_CUR();
5e691bc6
DM		 1568
1569 CX_DEBUG(cx, "UNWIND");
a0d0e21e 1570 /* Note: we don't need to restore the base context info till the end. */
76d10131
DM		 1571
1572 CX_LEAVE_SCOPE(cx);
1573
6b35e009 1574 switch (CxTYPE(cx)) {
c90c0ff4 1575 case CXt_SUBST:
b405d38b 1576 CX_POPSUBST(cx);
7332835e
DM		 1577 /* CXt_SUBST is not a block context type, so skip the
1578 * cx_popblock(cx) below */
1579 if (cxstack_ix == cxix + 1) {
1580 cxstack_ix--;
1581 return;
1582 }
80d88db0 1583 break;
a0d0e21e 1584 case CXt_SUB:
a73d8813 1585 cx_popsub(cx);
a0d0e21e
LW		 1586 break;
1587 case CXt_EVAL:
13febba5 1588 cx_popeval(cx);
03e489bc 1589 break;
93661e56 1590 case CXt_LOOP_PLAIN:
c6fdafd0 1591 case CXt_LOOP_LAZYIV:
d01136d6 1592 case CXt_LOOP_LAZYSV:
93661e56
DM		 1593 case CXt_LOOP_LIST:
1594 case CXt_LOOP_ARY:
d1b6bf72 1595 cx_poploop(cx);
a0d0e21e 1596 break;
7896dde7
Z		 1597 case CXt_WHEN:
1598 cx_popwhen(cx);
1599 break;
1600 case CXt_GIVEN:
1601 cx_popgiven(cx);
b95eccd3 1602 break;
f217cb3d 1603 case CXt_BLOCK:
0a753a76 1604 case CXt_NULL:
f217cb3d 1605 /* these two don't have a POPFOO() */
a0d0e21e 1606 break;
7766f137 1607 case CXt_FORMAT:
6a7d52cc 1608 cx_popformat(cx);
7766f137 1609 break;
a0d0e21e 1610 }
fc6e609e 1611 if (cxstack_ix == cxix + 1) {
ed8ff0f3 1612 cx_popblock(cx);
fc6e609e 1613 }
c90c0ff4 1614 cxstack_ix--;
a0d0e21e 1615 }
fc6e609e 1616
a0d0e21e
LW		 1617}
1618
5a844595
GS		 1619void
1620Perl_qerror(pTHX_ SV *err)
1621{
7918f24d
NC		 1622 PERL_ARGS_ASSERT_QERROR;
1623
6b2fb389
DM		 1624 if (PL_in_eval) {
1625 if (PL_in_eval & EVAL_KEEPERR) {
147e3846 1626 Perl_ck_warner(aTHX_ packWARN(WARN_MISC), "\t(in cleanup) %" SVf,
ecad31f0 1627 SVfARG(err));
6b2fb389
DM		 1628 }
1629 else
1630 sv_catsv(ERRSV, err);
1631 }
5a844595
GS		 1632 else if (PL_errors)
1633 sv_catsv(PL_errors, err);
1634 else
147e3846 1635 Perl_warn(aTHX_ "%" SVf, SVfARG(err));
13765c85
DM		 1636 if (PL_parser)
1637 ++PL_parser->error_count;
5a844595
GS		 1638}
1639
d308a779
DM		 1640
1641
06a7bc17
DM		 1642/* pop a CXt_EVAL context and in addition, if it was a require then
1643 * based on action:
1644 * 0: do nothing extra;
1645 * 1: undef $INC{$name}; croak "$name did not return a true value";
1646 * 2: delete $INC{$name}; croak "$errsv: Compilation failed in require"
1647 */
d308a779 1648
8a1fd305 1649static void
06a7bc17 1650S_pop_eval_context_maybe_croak(pTHX_ PERL_CONTEXT *cx, SV *errsv, int action)
d308a779 1651{
51787acf 1652 SV *namesv = NULL; /* init to avoid dumb compiler warning */
06a7bc17
DM		 1653 bool do_croak;
1654
1655 CX_LEAVE_SCOPE(cx);
1656 do_croak = action && (CxOLD_OP_TYPE(cx) == OP_REQUIRE);
2a1e0dfe
DM		 1657 if (do_croak) {
1658 /* keep namesv alive after cx_popeval() */
1659 namesv = cx->blk_eval.old_namesv;
1660 cx->blk_eval.old_namesv = NULL;
1661 sv_2mortal(namesv);
1662 }
06a7bc17
DM		 1663 cx_popeval(cx);
1664 cx_popblock(cx);
1665 CX_POP(cx);
1666
1667 if (do_croak) {
1668 const char *fmt;
1669 HV *inc_hv = GvHVn(PL_incgv);
1670 I32 klen = SvUTF8(namesv) ? -(I32)SvCUR(namesv) : (I32)SvCUR(namesv);
1671 const char *key = SvPVX_const(namesv);
d308a779 1672
06a7bc17
DM		 1673 if (action == 1) {
1674 (void)hv_delete(inc_hv, key, klen, G_DISCARD);
147e3846 1675 fmt = "%" SVf " did not return a true value";
06a7bc17
DM		 1676 errsv = namesv;
1677 }
1678 else {
1679 (void)hv_store(inc_hv, key, klen, &PL_sv_undef, 0);
147e3846 1680 fmt = "%" SVf "Compilation failed in require";
06a7bc17
DM		 1681 if (!errsv)
1682 errsv = newSVpvs_flags("Unknown error\n", SVs_TEMP);
1683 }
1684
1685 Perl_croak(aTHX_ fmt, SVfARG(errsv));
1686 }
d308a779
DM		 1687}
1688
1689
8c86f023
DM		 1690/* die_unwind(): this is the final destination for the various croak()
1691 * functions. If we're in an eval, unwind the context and other stacks
1692 * back to the top-most CXt_EVAL and set $@ to msv; otherwise print msv
1693 * to STDERR and initiate an exit. Note that if the CXt_EVAL popped back
1694 * to is a require the exception will be rethrown, as requires don't
1695 * actually trap exceptions.
1696 */
06a7bc17 1697
bb4c52e0 1698void
c5df3096 1699Perl_die_unwind(pTHX_ SV *msv)
a0d0e21e 1700{
8c86f023 1701 SV *exceptsv = msv;
96d9b9cd 1702 U8 in_eval = PL_in_eval;
c5df3096 1703 PERL_ARGS_ASSERT_DIE_UNWIND;
87582a92 1704
96d9b9cd 1705 if (in_eval) {
a0d0e21e 1706 I32 cxix;
a0d0e21e 1707
b66d79a6
DM		 1708 /* We need to keep this SV alive through all the stack unwinding
1709 * and FREETMPSing below, while ensuing that it doesn't leak
1710 * if we call out to something which then dies (e.g. sub STORE{die}
1711 * when unlocalising a tied var). So we do a dance with
1712 * mortalising and SAVEFREEing.
1713 */
1714 sv_2mortal(SvREFCNT_inc_simple_NN(exceptsv));
8c86f023 1715
22a30693
Z		 1716 /*
1717 * Historically, perl used to set ERRSV ($@) early in the die
1718 * process and rely on it not getting clobbered during unwinding.
1719 * That sucked, because it was liable to get clobbered, so the
1720 * setting of ERRSV used to emit the exception from eval{} has
1721 * been moved to much later, after unwinding (see just before
1722 * JMPENV_JUMP below). However, some modules were relying on the
1723 * early setting, by examining $@ during unwinding to use it as
1724 * a flag indicating whether the current unwinding was caused by
1725 * an exception. It was never a reliable flag for that purpose,
1726 * being totally open to false positives even without actual
1727 * clobberage, but was useful enough for production code to
1728 * semantically rely on it.
1729 *
1730 * We'd like to have a proper introspective interface that
1731 * explicitly describes the reason for whatever unwinding
1732 * operations are currently in progress, so that those modules
1733 * work reliably and $@ isn't further overloaded. But we don't
1734 * have one yet. In its absence, as a stopgap measure, ERRSV is
1735 * now *additionally* set here, before unwinding, to serve as the
1736 * (unreliable) flag that it used to.
1737 *
1738 * This behaviour is temporary, and should be removed when a
1739 * proper way to detect exceptional unwinding has been developed.
1740 * As of 2010-12, the authors of modules relying on the hack
1741 * are aware of the issue, because the modules failed on
1742 * perls 5.13.{1..7} which had late setting of $@ without this
1743 * early-setting hack.
1744 */
933e3e63
TC		 1745 if (!(in_eval & EVAL_KEEPERR)) {
1746 /* remove any read-only/magic from the SV, so we don't
1747 get infinite recursion when setting ERRSV */
1748 SANE_ERRSV();
8c86f023
DM		 1749 sv_setsv_flags(ERRSV, exceptsv,
1750 (SV_GMAGIC|SV_DO_COW_SVSETSV|SV_NOSTEAL));
933e3e63 1751 }
22a30693 1752
fc941f37 1753 if (in_eval & EVAL_KEEPERR) {
147e3846 1754 Perl_ck_warner(aTHX_ packWARN(WARN_MISC), "\t(in cleanup) %" SVf,
fc941f37
Z		 1755 SVfARG(exceptsv));
1756 }
1757
5a844595
GS		 1758 while ((cxix = dopoptoeval(cxstack_ix)) < 0
1759 && PL_curstackinfo->si_prev)
1760 {
bac4b2ad 1761 dounwind(-1);
d3acc0f7 1762 POPSTACK;
bac4b2ad 1763 }
e336de0d 1764
a0d0e21e 1765 if (cxix >= 0) {
eb578fdb 1766 PERL_CONTEXT *cx;
f5ddd604 1767 SV **oldsp;
1c23e2bd 1768 U8 gimme;
8f89e5a9
Z		 1769 JMPENV *restartjmpenv;
1770 OP *restartop;
a0d0e21e
LW		 1771
1772 if (cxix < cxstack_ix)
1773 dounwind(cxix);
1774
4ebe6e95 1775 cx = CX_CUR();
f7d0774b 1776 assert(CxTYPE(cx) == CXt_EVAL);
e17c1e7c
DM		 1777
1778 /* return false to the caller of eval */
f5ddd604 1779 oldsp = PL_stack_base + cx->blk_oldsp;
f7d0774b 1780 gimme = cx->blk_gimme;
f7d0774b 1781 if (gimme == G_SCALAR)
f5ddd604
DM		 1782 *++oldsp = &PL_sv_undef;
1783 PL_stack_sp = oldsp;
f7d0774b 1784
7d140242
DM		 1785 restartjmpenv = cx->blk_eval.cur_top_env;
1786 restartop = cx->blk_eval.retop;
b66d79a6
DM		 1787
1788 /* We need a FREETMPS here to avoid late-called destructors
1789 * clobbering $@ *after* we set it below, e.g.
1790 * sub DESTROY { eval { die "X" } }
1791 * eval { my $x = bless []; die $x = 0, "Y" };
1792 * is($@, "Y")
1793 * Here the clearing of the $x ref mortalises the anon array,
1794 * which needs to be freed *before* $& is set to "Y",
1795 * otherwise it gets overwritten with "X".
1796 *
1797 * However, the FREETMPS will clobber exceptsv, so preserve it
1798 * on the savestack for now.
1799 */
1800 SAVEFREESV(SvREFCNT_inc_simple_NN(exceptsv));
1801 FREETMPS;
1802 /* now we're about to pop the savestack, so re-mortalise it */
1803 sv_2mortal(SvREFCNT_inc_simple_NN(exceptsv));
1804
06a7bc17
DM		 1805 /* Note that unlike pp_entereval, pp_require isn't supposed to
1806 * trap errors. So if we're a require, after we pop the
1807 * CXt_EVAL that pp_require pushed, rethrow the error with
1808 * croak(exceptsv). This is all handled by the call below when
1809 * action == 2.
1810 */
1811 S_pop_eval_context_maybe_croak(aTHX_ cx, exceptsv, 2);
a0d0e21e 1812
933e3e63
TC		 1813 if (!(in_eval & EVAL_KEEPERR)) {
1814 SANE_ERRSV();
96d9b9cd 1815 sv_setsv(ERRSV, exceptsv);
933e3e63 1816 }
8f89e5a9
Z		 1817 PL_restartjmpenv = restartjmpenv;
1818 PL_restartop = restartop;
bb4c52e0 1819 JMPENV_JUMP(3);
e5964223 1820 NOT_REACHED; /* NOTREACHED */
a0d0e21e
LW		 1821 }
1822 }
87582a92 1823
96d9b9cd 1824 write_to_stderr(exceptsv);
f86702cc 1825 my_failure_exit();
e5964223 1826 NOT_REACHED; /* NOTREACHED */
a0d0e21e
LW		 1827}
1828
1829PP(pp_xor)
1830{
20b7effb 1831 dSP; dPOPTOPssrl;
f4c975aa 1832 if (SvTRUE_NN(left) != SvTRUE_NN(right))
a0d0e21e
LW		 1833 RETSETYES;
1834 else
1835 RETSETNO;
1836}
1837
8dff4fc5 1838/*
dcccc8ff
KW		 1839
1840=head1 CV Manipulation Functions
1841
8dff4fc5
BM		 1842=for apidoc caller_cx
1843
72d33970 1844The XSUB-writer's equivalent of L<caller()|perlfunc/caller>. The
8dff4fc5 1845returned C<PERL_CONTEXT> structure can be interrogated to find all the
72d33970 1846information returned to Perl by C<caller>. Note that XSUBs don't get a
8dff4fc5
BM		 1847stack frame, so C<caller_cx(0, NULL)> will return information for the
1848immediately-surrounding Perl code.
1849
1850This function skips over the automatic calls to C<&DB::sub> made on the
72d33970 1851behalf of the debugger. If the stack frame requested was a sub called by
8dff4fc5
BM		 1852C<DB::sub>, the return value will be the frame for the call to
1853C<DB::sub>, since that has the correct line number/etc. for the call
72d33970 1854site. If I<dbcxp> is non-C<NULL>, it will be set to a pointer to the
8dff4fc5
BM		 1855frame for the sub call itself.
1856
1857=cut
1858*/
1859
1860const PERL_CONTEXT *
1861Perl_caller_cx(pTHX_ I32 count, const PERL_CONTEXT **dbcxp)
a0d0e21e 1862{
20ef288c 1863 I32 cxix = dopoptosub(cxstack_ix);
eb578fdb
KW		 1864 const PERL_CONTEXT *cx;
1865 const PERL_CONTEXT *ccstack = cxstack;
901017d6 1866 const PERL_SI *top_si = PL_curstackinfo;
27d41816 1867
a0d0e21e 1868 for (;;) {
2c375eb9
GS		 1869 /* we may be in a higher stacklevel, so dig down deeper */
1870 while (cxix < 0 && top_si->si_type != PERLSI_MAIN) {
1871 top_si = top_si->si_prev;
1872 ccstack = top_si->si_cxstack;
1873 cxix = dopoptosub_at(ccstack, top_si->si_cxix);
1874 }
8dff4fc5
BM		 1875 if (cxix < 0)
1876 return NULL;
f2a7f298 1877 /* caller() should not report the automatic calls to &DB::sub */
1878 if (PL_DBsub && GvCV(PL_DBsub) && cxix >= 0 &&
3280af22 1879 ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))
a0d0e21e
LW		 1880 count++;
1881 if (!count--)
1882 break;
2c375eb9 1883 cxix = dopoptosub_at(ccstack, cxix - 1);
a0d0e21e 1884 }
2c375eb9
GS		 1885
1886 cx = &ccstack[cxix];
8dff4fc5
BM		 1887 if (dbcxp) *dbcxp = cx;
1888
7766f137 1889 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
f54cb97a 1890 const I32 dbcxix = dopoptosub_at(ccstack, cxix - 1);
2c375eb9 1891 /* We expect that ccstack[dbcxix] is CXt_SUB, anyway, the
06a5b730 1892 field below is defined for any cx. */
f2a7f298 1893 /* caller() should not report the automatic calls to &DB::sub */
1894 if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub))
2c375eb9 1895 cx = &ccstack[dbcxix];
06a5b730
PP		 1896 }
1897
8dff4fc5
BM		 1898 return cx;
1899}
1900
1901PP(pp_caller)
1902{
8dff4fc5 1903 dSP;
eb578fdb 1904 const PERL_CONTEXT *cx;
8dff4fc5 1905 const PERL_CONTEXT *dbcx;
1c23e2bd 1906 U8 gimme = GIMME_V;
d527ce7c 1907 const HEK *stash_hek;
8dff4fc5 1908 I32 count = 0;
ce0b554b 1909 bool has_arg = MAXARG && TOPs;
25502127 1910 const COP *lcop;
8dff4fc5 1911
ce0b554b
FC		 1912 if (MAXARG) {
1913 if (has_arg)
8dff4fc5 1914 count = POPi;
ce0b554b
FC		 1915 else (void)POPs;
1916 }
8dff4fc5 1917
ce0b554b 1918 cx = caller_cx(count + !!(PL_op->op_private & OPpOFFBYONE), &dbcx);
8dff4fc5 1919 if (!cx) {
48ebc325 1920 if (gimme != G_ARRAY) {
8dff4fc5
BM		 1921 EXTEND(SP, 1);
1922 RETPUSHUNDEF;
1923 }
1924 RETURN;
1925 }
1926
5e691bc6 1927 CX_DEBUG(cx, "CALLER");
d0279c7c 1928 assert(CopSTASH(cx->blk_oldcop));
e7886211
FC		 1929 stash_hek = SvTYPE(CopSTASH(cx->blk_oldcop)) == SVt_PVHV
1930 ? HvNAME_HEK((HV*)CopSTASH(cx->blk_oldcop))
1931 : NULL;
48ebc325 1932 if (gimme != G_ARRAY) {
27d41816 1933 EXTEND(SP, 1);
d527ce7c 1934 if (!stash_hek)
3280af22 1935 PUSHs(&PL_sv_undef);
49d8d3a1
MB		 1936 else {
1937 dTARGET;
d527ce7c 1938 sv_sethek(TARG, stash_hek);
49d8d3a1
MB		 1939 PUSHs(TARG);
1940 }
a0d0e21e
LW		 1941 RETURN;
1942 }
a0d0e21e 1943
b3ca2e83 1944 EXTEND(SP, 11);
27d41816 1945
d527ce7c 1946 if (!stash_hek)
3280af22 1947 PUSHs(&PL_sv_undef);
d527ce7c
BF		 1948 else {
1949 dTARGET;
1950 sv_sethek(TARG, stash_hek);
1951 PUSHTARG;
1952 }
6e449a3a 1953 mPUSHs(newSVpv(OutCopFILE(cx->blk_oldcop), 0));
e6dae479 1954 lcop = closest_cop(cx->blk_oldcop, OpSIBLING(cx->blk_oldcop),
25502127
FC		 1955 cx->blk_sub.retop, TRUE);
1956 if (!lcop)
1957 lcop = cx->blk_oldcop;
e9e9e546 1958 mPUSHu(CopLINE(lcop));
ce0b554b 1959 if (!has_arg)
a0d0e21e 1960 RETURN;
7766f137
GS		 1961 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
1962 /* So is ccstack[dbcxix]. */
a5f47741 1963 if (CvHASGV(dbcx->blk_sub.cv)) {
ecf05a58 1964 PUSHs(cv_name(dbcx->blk_sub.cv, 0, 0));
bf38a478 1965 PUSHs(boolSV(CxHASARGS(cx)));
07b8c804
RGS		 1966 }
1967 else {
84bafc02 1968 PUSHs(newSVpvs_flags("(unknown)", SVs_TEMP));
bf38a478 1969 PUSHs(boolSV(CxHASARGS(cx)));
07b8c804 1970 }
a0d0e21e
LW		 1971 }
1972 else {
84bafc02 1973 PUSHs(newSVpvs_flags("(eval)", SVs_TEMP));
725c44f9 1974 PUSHs(&PL_sv_zero);
a0d0e21e 1975 }
1c23e2bd 1976 gimme = cx->blk_gimme;
54310121 1977 if (gimme == G_VOID)
3280af22 1978 PUSHs(&PL_sv_undef);
54310121 1979 else
98625aca 1980 PUSHs(boolSV((gimme & G_WANT) == G_ARRAY));
6b35e009 1981 if (CxTYPE(cx) == CXt_EVAL) {
811a4de9 1982 /* eval STRING */
85a64632 1983 if (CxOLD_OP_TYPE(cx) == OP_ENTEREVAL) {
78beb4ca
TC		 1984 SV *cur_text = cx->blk_eval.cur_text;
1985 if (SvCUR(cur_text) >= 2) {
1986 PUSHs(newSVpvn_flags(SvPVX(cur_text), SvCUR(cur_text)-2,
1987 SvUTF8(cur_text)|SVs_TEMP));
1988 }
1989 else {
1990 /* I think this is will always be "", but be sure */
1991 PUSHs(sv_2mortal(newSVsv(cur_text)));
1992 }
1993
3280af22 1994 PUSHs(&PL_sv_no);
0f79a09d 1995 }
811a4de9 1996 /* require */
0f79a09d 1997 else if (cx->blk_eval.old_namesv) {
6e449a3a 1998 mPUSHs(newSVsv(cx->blk_eval.old_namesv));
3280af22 1999 PUSHs(&PL_sv_yes);
06a5b730 2000 }
811a4de9
GS		 2001 /* eval BLOCK (try blocks have old_namesv == 0) */
2002 else {
2003 PUSHs(&PL_sv_undef);
2004 PUSHs(&PL_sv_undef);
2005 }
4633a7c4 2006 }
a682de96
GS		 2007 else {
2008 PUSHs(&PL_sv_undef);
2009 PUSHs(&PL_sv_undef);
2010 }
bafb2adc 2011 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)
ed094faf 2012 && CopSTASH_eq(PL_curcop, PL_debstash))
4633a7c4 2013 {
9513529b
DM		 2014 /* slot 0 of the pad contains the original @_ */
2015 AV * const ary = MUTABLE_AV(AvARRAY(MUTABLE_AV(
2016 PadlistARRAY(CvPADLIST(cx->blk_sub.cv))[
2017 cx->blk_sub.olddepth+1]))[0]);
c70927a6 2018 const SSize_t off = AvARRAY(ary) - AvALLOC(ary);
a0d0e21e 2019
e1a80902 2020 Perl_init_dbargs(aTHX);
a0d0e21e 2021
3280af22
NIS		 2022 if (AvMAX(PL_dbargs) < AvFILLp(ary) + off)
2023 av_extend(PL_dbargs, AvFILLp(ary) + off);
f14cf363
TC		 2024 if (AvFILLp(ary) + 1 + off)
2025 Copy(AvALLOC(ary), AvARRAY(PL_dbargs), AvFILLp(ary) + 1 + off, SV*);
3280af22 2026 AvFILLp(PL_dbargs) = AvFILLp(ary) + off;
a0d0e21e 2027 }
6e449a3a 2028 mPUSHi(CopHINTS_get(cx->blk_oldcop));
e476b1b5
GS		 2029 {
2030 SV * mask ;
72dc9ed5 2031 STRLEN * const old_warnings = cx->blk_oldcop->cop_warnings ;
114bafba 2032
f07626ad 2033 if (old_warnings == pWARN_NONE)
e476b1b5 2034 mask = newSVpvn(WARN_NONEstring, WARNsize) ;
f07626ad
FC		 2035 else if (old_warnings == pWARN_STD && (PL_dowarn & G_WARN_ON) == 0)
2036 mask = &PL_sv_undef ;
ac27b0f5 2037 else if (old_warnings == pWARN_ALL ||
75b6c4ca 2038 (old_warnings == pWARN_STD && PL_dowarn & G_WARN_ON)) {
006c1a1d 2039 mask = newSVpvn(WARN_ALLstring, WARNsize) ;
75b6c4ca 2040 }
e476b1b5 2041 else
72dc9ed5 2042 mask = newSVpvn((char *) (old_warnings + 1), old_warnings[0]);
6e449a3a 2043 mPUSHs(mask);
e476b1b5 2044 }
b3ca2e83 2045
c28fe1ec 2046 PUSHs(cx->blk_oldcop->cop_hints_hash ?
20439bc7 2047 sv_2mortal(newRV_noinc(MUTABLE_SV(cop_hints_2hv(cx->blk_oldcop, 0))))
b3ca2e83 2048 : &PL_sv_undef);
a0d0e21e
LW		 2049 RETURN;
2050}
2051
a0d0e21e
LW		 2052PP(pp_reset)
2053{
39644a26 2054 dSP;
ca826051
FC		 2055 const char * tmps;
2056 STRLEN len = 0;
2372d073
DM		 2057 if (MAXARG < 1 || (!TOPs && !POPs)) {
2058 EXTEND(SP, 1);
ca826051 2059 tmps = NULL, len = 0;
2372d073 2060 }
ca826051
FC		 2061 else
2062 tmps = SvPVx_const(POPs, len);
2063 sv_resetpvn(tmps, len, CopSTASH(PL_curcop));
3280af22 2064 PUSHs(&PL_sv_yes);
a0d0e21e
LW		 2065 RETURN;
2066}
2067
dd2155a4
DM		 2068/* like pp_nextstate, but used instead when the debugger is active */
2069
a0d0e21e
LW		 2070PP(pp_dbstate)
2071{
533c011a 2072 PL_curcop = (COP*)PL_op;
a0d0e21e 2073 TAINT_NOT; /* Each statement is presumed innocent */
4ebe6e95 2074 PL_stack_sp = PL_stack_base + CX_CUR()->blk_oldsp;
a0d0e21e
LW		 2075 FREETMPS;
2076
f410a211
NC		 2077 PERL_ASYNC_CHECK();
2078
88df5f01 2079 if (PL_op->op_flags & OPf_SPECIAL /* breakpoint */
a6d69523 2080 || PL_DBsingle_iv || PL_DBsignal_iv || PL_DBtrace_iv)
a0d0e21e 2081 {
39644a26 2082 dSP;
eb578fdb 2083 PERL_CONTEXT *cx;
1c23e2bd 2084 const U8 gimme = G_ARRAY;
0bd48802 2085 GV * const gv = PL_DBgv;
432d4561
JL		 2086 CV * cv = NULL;
2087
2088 if (gv && isGV_with_GP(gv))
2089 cv = GvCV(gv);
a0d0e21e 2090
c2cb6f77 2091 if (!cv || (!CvROOT(cv) && !CvXSUB(cv)))
cea2e8a9 2092 DIE(aTHX_ "No DB::DB routine defined");
a0d0e21e 2093
aea4f609
DM		 2094 if (CvDEPTH(cv) >= 1 && !(PL_debug & DEBUG_DB_RECURSE_FLAG))
2095 /* don't do recursive DB::DB call */
a0d0e21e 2096 return NORMAL;
748a9306 2097
aed2304a 2098 if (CvISXSUB(cv)) {
8ae997c5
DM		 2099 ENTER;
2100 SAVEI32(PL_debug);
2101 PL_debug = 0;
2102 SAVESTACK_POS();
8a44b450 2103 SAVETMPS;
c127bd3a
SF		 2104 PUSHMARK(SP);
2105 (void)(*CvXSUB(cv))(aTHX_ cv);
c127bd3a 2106 FREETMPS;
a57c6685 2107 LEAVE;
c127bd3a
SF		 2108 return NORMAL;
2109 }
2110 else {
ed8ff0f3 2111 cx = cx_pushblock(CXt_SUB, gimme, SP, PL_savestack_ix);
a73d8813
DM		 2112 cx_pushsub(cx, cv, PL_op->op_next, 0);
2113 /* OP_DBSTATE's op_private holds hint bits rather than
2114 * the lvalue-ish flags seen in OP_ENTERSUB. So cancel
2115 * any CxLVAL() flags that have now been mis-calculated */
2116 cx->blk_u16 = 0;
8ae997c5
DM		 2117
2118 SAVEI32(PL_debug);
2119 PL_debug = 0;
2120 SAVESTACK_POS();
c127bd3a 2121 CvDEPTH(cv)++;
d2af2719 2122 if (CvDEPTH(cv) >= 2)
9d976ff5 2123 pad_push(CvPADLIST(cv), CvDEPTH(cv));
9d976ff5 2124 PAD_SET_CUR_NOSAVE(CvPADLIST(cv), CvDEPTH(cv));
c127bd3a
SF		 2125 RETURNOP(CvSTART(cv));
2126 }
a0d0e21e
LW		 2127 }
2128 else
2129 return NORMAL;
2130}
2131
0663a8f8 2132
2b9a6457
VP		 2133PP(pp_enter)
2134{
1c23e2bd 2135 U8 gimme = GIMME_V;
2b9a6457 2136
d4ce7588
DM		 2137 (void)cx_pushblock(CXt_BLOCK, gimme, PL_stack_sp, PL_savestack_ix);
2138 return NORMAL;
2b9a6457
VP		 2139}
2140
d4ce7588 2141
2b9a6457
VP		 2142PP(pp_leave)
2143{
eb578fdb 2144 PERL_CONTEXT *cx;
f5ddd604 2145 SV **oldsp;
1c23e2bd 2146 U8 gimme;
2b9a6457 2147
4ebe6e95 2148 cx = CX_CUR();
61d3b95a 2149 assert(CxTYPE(cx) == CXt_BLOCK);
4df352a8
DM		 2150
2151 if (PL_op->op_flags & OPf_SPECIAL)
c349b9a0
DM		 2152 /* fake block should preserve $1 et al; e.g. /(...)/ while ...; */
2153 cx->blk_oldpm = PL_curpm;
4df352a8 2154
f5ddd604 2155 oldsp = PL_stack_base + cx->blk_oldsp;
61d3b95a 2156 gimme = cx->blk_gimme;
2b9a6457 2157
0663a8f8 2158 if (gimme == G_VOID)
f5ddd604 2159 PL_stack_sp = oldsp;
0663a8f8 2160 else
f5ddd604 2161 leave_adjust_stacks(oldsp, oldsp, gimme,
75bc488d 2162 PL_op->op_private & OPpLVALUE ? 3 : 1);
67f63db7 2163
2f450c1b 2164 CX_LEAVE_SCOPE(cx);
ed8ff0f3 2165 cx_popblock(cx);
5da525e9 2166 CX_POP(cx);
2b9a6457 2167
0663a8f8 2168 return NORMAL;
2b9a6457
VP		 2169}
2170
eaa9f768
JH		 2171static bool
2172S_outside_integer(pTHX_ SV *sv)
2173{
2174 if (SvOK(sv)) {
2175 const NV nv = SvNV_nomg(sv);
415b66b2
JH		 2176 if (Perl_isinfnan(nv))
2177 return TRUE;
eaa9f768
JH		 2178#ifdef NV_PRESERVES_UV
2179 if (nv < (NV)IV_MIN || nv > (NV)IV_MAX)
2180 return TRUE;
2181#else
2182 if (nv <= (NV)IV_MIN)
2183 return TRUE;
2184 if ((nv > 0) &&
2185 ((nv > (NV)UV_MAX ||
2186 SvUV_nomg(sv) > (UV)IV_MAX)))
2187 return TRUE;
2188#endif
2189 }
2190 return FALSE;
2191}
2192
a0d0e21e
LW		 2193PP(pp_enteriter)
2194{
20b7effb 2195 dSP; dMARK;
eb578fdb 2196 PERL_CONTEXT *cx;
1c23e2bd 2197 const U8 gimme = GIMME_V;
4ad63d70 2198 void *itervarp; /* GV or pad slot of the iteration variable */
f0bb9bf7 2199 SV *itersave; /* the old var in the iterator var slot */
93661e56 2200 U8 cxflags = 0;
a0d0e21e 2201
aafca525 2202 if (PL_op->op_targ) { /* "my" variable */
4ad63d70
DM		 2203 itervarp = &PAD_SVl(PL_op->op_targ);
2204 itersave = *(SV**)itervarp;
2205 assert(itersave);
aafca525 2206 if (PL_op->op_private & OPpLVAL_INTRO) { /* for my $x (...) */
fdb8b82b
DM		 2207 /* the SV currently in the pad slot is never live during
2208 * iteration (the slot is always aliased to one of the items)
2209 * so it's always stale */
4ad63d70 2210 SvPADSTALE_on(itersave);
14f338dc 2211 }
4ad63d70 2212 SvREFCNT_inc_simple_void_NN(itersave);
93661e56 2213 cxflags = CXp_FOR_PAD;
54b9620d 2214 }
d39c26a6
FC		 2215 else {
2216 SV * const sv = POPs;
4ad63d70 2217 itervarp = (void *)sv;
d4e2b4d6 2218 if (LIKELY(isGV(sv))) { /* symbol table variable */
6d3ca00e
DM		 2219 itersave = GvSV(sv);
2220 SvREFCNT_inc_simple_void(itersave);
93661e56 2221 cxflags = CXp_FOR_GV;
7896dde7
Z		 2222 if (PL_op->op_private & OPpITER_DEF)
2223 cxflags |= CXp_FOR_DEF;
d4e2b4d6
DM		 2224 }
2225 else { /* LV ref: for \$foo (...) */
2226 assert(SvTYPE(sv) == SVt_PVMG);
2227 assert(SvMAGIC(sv));
2228 assert(SvMAGIC(sv)->mg_type == PERL_MAGIC_lvref);
2229 itersave = NULL;
93661e56 2230 cxflags = CXp_FOR_LVREF;
d4e2b4d6 2231 }
d39c26a6 2232 }
7896dde7
Z		 2233 /* OPpITER_DEF (implicit $_) should only occur with a GV iter var */
2234 assert((cxflags & CXp_FOR_GV) || !(PL_op->op_private & OPpITER_DEF));
0d863452 2235
75fbe096
DM		 2236 /* Note that this context is initially set as CXt_NULL. Further on
2237 * down it's changed to one of the CXt_LOOP_*. Before it's changed,
2238 * there mustn't be anything in the blk_loop substruct that requires
2239 * freeing or undoing, in case we die in the meantime. And vice-versa.
2240 */
ed8ff0f3 2241 cx = cx_pushblock(cxflags, gimme, MARK, PL_savestack_ix);
d1b6bf72 2242 cx_pushloop_for(cx, itervarp, itersave);
2c49879e 2243
533c011a 2244 if (PL_op->op_flags & OPf_STACKED) {
2c49879e
DM		 2245 /* OPf_STACKED implies either a single array: for(@), with a
2246 * single AV on the stack, or a range: for (1..5), with 1 and 5 on
2247 * the stack */
d01136d6
BS		 2248 SV *maybe_ary = POPs;
2249 if (SvTYPE(maybe_ary) != SVt_PVAV) {
2c49879e 2250 /* range */
89ea2908 2251 dPOPss;
d01136d6 2252 SV * const right = maybe_ary;
93661e56 2253 if (UNLIKELY(cxflags & CXp_FOR_LVREF))
d39c26a6 2254 DIE(aTHX_ "Assigned value is not a reference");
984a4bea
RD		 2255 SvGETMAGIC(sv);
2256 SvGETMAGIC(right);
4fe3f0fa 2257 if (RANGE_IS_NUMERIC(sv,right)) {
c6fdafd0 2258 cx->cx_type |= CXt_LOOP_LAZYIV;
eaa9f768
JH		 2259 if (S_outside_integer(aTHX_ sv) ||
2260 S_outside_integer(aTHX_ right))
076d9a11 2261 DIE(aTHX_ "Range iterator outside integer range");
f52e41ad
FC		 2262 cx->blk_loop.state_u.lazyiv.cur = SvIV_nomg(sv);
2263 cx->blk_loop.state_u.lazyiv.end = SvIV_nomg(right);
89ea2908 2264 }
3f63a782 2265 else {
d01136d6 2266 cx->cx_type |= CXt_LOOP_LAZYSV;
d01136d6
BS		 2267 cx->blk_loop.state_u.lazysv.cur = newSVsv(sv);
2268 cx->blk_loop.state_u.lazysv.end = right;
2c49879e 2269 SvREFCNT_inc_simple_void_NN(right);
d01136d6 2270 (void) SvPV_force_nolen(cx->blk_loop.state_u.lazysv.cur);
267cc4a8
NC		 2271 /* This will do the upgrade to SVt_PV, and warn if the value
2272 is uninitialised. */
10516c54 2273 (void) SvPV_nolen_const(right);
267cc4a8
NC		 2274 /* Doing this avoids a check every time in pp_iter in pp_hot.c
2275 to replace !SvOK() with a pointer to "". */
2276 if (!SvOK(right)) {
2277 SvREFCNT_dec(right);
d01136d6 2278 cx->blk_loop.state_u.lazysv.end = &PL_sv_no;
267cc4a8 2279 }
3f63a782 2280 }
89ea2908 2281 }
d01136d6 2282 else /* SvTYPE(maybe_ary) == SVt_PVAV */ {
2c49879e 2283 /* for (@array) {} */
93661e56 2284 cx->cx_type |= CXt_LOOP_ARY;
502c6561 2285 cx->blk_loop.state_u.ary.ary = MUTABLE_AV(maybe_ary);
2c49879e 2286 SvREFCNT_inc_simple_void_NN(maybe_ary);
d01136d6
BS		 2287 cx->blk_loop.state_u.ary.ix =
2288 (PL_op->op_private & OPpITER_REVERSED) ?
2289 AvFILL(cx->blk_loop.state_u.ary.ary) + 1 :
2290 -1;
ef3e5ea9 2291 }
8a1f10dd 2292 /* EXTEND(SP, 1) not needed in this branch because we just did POPs */
89ea2908 2293 }
d01136d6 2294 else { /* iterating over items on the stack */
93661e56 2295 cx->cx_type |= CXt_LOOP_LIST;
1bef65a2 2296 cx->blk_oldsp = SP - PL_stack_base;
93661e56
DM		 2297 cx->blk_loop.state_u.stack.basesp = MARK - PL_stack_base;
2298 cx->blk_loop.state_u.stack.ix =
2299 (PL_op->op_private & OPpITER_REVERSED)
2300 ? cx->blk_oldsp + 1
2301 : cx->blk_loop.state_u.stack.basesp;
8a1f10dd
DM		 2302 /* pre-extend stack so pp_iter doesn't have to check every time
2303 * it pushes yes/no */
2304 EXTEND(SP, 1);
4633a7c4 2305 }
a0d0e21e
LW		 2306
2307 RETURN;
2308}
2309
2310PP(pp_enterloop)
2311{
eb578fdb 2312 PERL_CONTEXT *cx;
1c23e2bd 2313 const U8 gimme = GIMME_V;
a0d0e21e 2314
d4ce7588 2315 cx = cx_pushblock(CXt_LOOP_PLAIN, gimme, PL_stack_sp, PL_savestack_ix);
d1b6bf72 2316 cx_pushloop_plain(cx);
d4ce7588 2317 return NORMAL;
a0d0e21e
LW		 2318}
2319
d4ce7588 2320
a0d0e21e
LW		 2321PP(pp_leaveloop)
2322{
eb578fdb 2323 PERL_CONTEXT *cx;
1c23e2bd 2324 U8 gimme;
032736ab 2325 SV **base;
f5ddd604 2326 SV **oldsp;
a0d0e21e 2327
4ebe6e95 2328 cx = CX_CUR();
3b719c58 2329 assert(CxTYPE_is_LOOP(cx));
032736ab
DM		 2330 oldsp = PL_stack_base + cx->blk_oldsp;
2331 base = CxTYPE(cx) == CXt_LOOP_LIST
1bef65a2 2332 ? PL_stack_base + cx->blk_loop.state_u.stack.basesp
032736ab 2333 : oldsp;
61d3b95a 2334 gimme = cx->blk_gimme;
f86702cc 2335
0663a8f8 2336 if (gimme == G_VOID)
032736ab 2337 PL_stack_sp = base;
0663a8f8 2338 else
032736ab 2339 leave_adjust_stacks(oldsp, base, gimme,
75bc488d 2340 PL_op->op_private & OPpLVALUE ? 3 : 1);
f86702cc 2341
2f450c1b 2342 CX_LEAVE_SCOPE(cx);
d1b6bf72 2343 cx_poploop(cx); /* Stack values are safe: release loop vars ... */
ed8ff0f3 2344 cx_popblock(cx);
5da525e9 2345 CX_POP(cx);
f86702cc 2346
f86702cc 2347 return NORMAL;
a0d0e21e
LW		 2348}
2349
31ccb4f5
DM		 2350
2351/* This duplicates most of pp_leavesub, but with additional code to handle
2352 * return args in lvalue context. It was forked from pp_leavesub to
2353 * avoid slowing down that function any further.
2354 *
2355 * Any changes made to this function may need to be copied to pp_leavesub
2356 * and vice-versa.
c349b9a0
DM		 2357 *
2358 * also tail-called by pp_return
57486a97
DM		 2359 */
2360
31ccb4f5 2361PP(pp_leavesublv)
3bdf583b 2362{
1c23e2bd 2363 U8 gimme;
57486a97 2364 PERL_CONTEXT *cx;
799da9d7 2365 SV **oldsp;
5da525e9 2366 OP *retop;
57486a97 2367
4ebe6e95 2368 cx = CX_CUR();
61d3b95a
DM		 2369 assert(CxTYPE(cx) == CXt_SUB);
2370
2371 if (CxMULTICALL(cx)) {
1f0ba93b
DM		 2372 /* entry zero of a stack is always PL_sv_undef, which
2373 * simplifies converting a '()' return into undef in scalar context */
2374 assert(PL_stack_sp > PL_stack_base || *PL_stack_base == &PL_sv_undef);
85ecf147 2375 return 0;
1f0ba93b 2376 }
85ecf147 2377
61d3b95a 2378 gimme = cx->blk_gimme;
799da9d7 2379 oldsp = PL_stack_base + cx->blk_oldsp; /* last arg of previous frame */
57486a97 2380
799da9d7
DM		 2381 if (gimme == G_VOID)
2382 PL_stack_sp = oldsp;
2383 else {
2384 U8 lval = CxLVAL(cx);
2385 bool is_lval = (lval && !(lval & OPpENTERSUB_INARGS));
2386 const char *what = NULL;
2387
2388 if (gimme == G_SCALAR) {
2389 if (is_lval) {
2390 /* check for bad return arg */
2391 if (oldsp < PL_stack_sp) {
2392 SV *sv = *PL_stack_sp;
2393 if ((SvPADTMP(sv) || SvREADONLY(sv))) {
2394 what =
2395 SvREADONLY(sv) ? (sv == &PL_sv_undef) ? "undef"
2396 : "a readonly value" : "a temporary";
2397 }
2398 else goto ok;
2399 }
2400 else {
2401 /* sub:lvalue{} will take us here. */
2402 what = "undef";
2403 }
2404 croak:
2405 Perl_croak(aTHX_
2406 "Can't return %s from lvalue subroutine", what);
2407 }
57486a97 2408
799da9d7 2409 ok:
e02ce34b 2410 leave_adjust_stacks(oldsp, oldsp, gimme, is_lval ? 3 : 2);
e80c4acf 2411
799da9d7
DM		 2412 if (lval & OPpDEREF) {
2413 /* lval_sub()->{...} and similar */
2414 dSP;
2415 SvGETMAGIC(TOPs);
2416 if (!SvOK(TOPs)) {
2417 TOPs = vivify_ref(TOPs, CxLVAL(cx) & OPpDEREF);
2418 }
2419 PUTBACK;
2420 }
2421 }
2422 else {
2423 assert(gimme == G_ARRAY);
2424 assert (!(lval & OPpDEREF));
2425
2426 if (is_lval) {
2427 /* scan for bad return args */
2428 SV **p;
2429 for (p = PL_stack_sp; p > oldsp; p--) {
2430 SV *sv = *p;
2431 /* the PL_sv_undef exception is to allow things like
2432 * this to work, where PL_sv_undef acts as 'skip'
2433 * placeholder on the LHS of list assigns:
2434 * sub foo :lvalue { undef }
2435 * ($a, undef, foo(), $b) = 1..4;
2436 */
2437 if (sv != &PL_sv_undef && (SvPADTMP(sv) || SvREADONLY(sv)))
2438 {
2439 /* Might be flattened array after $#array = */
2440 what = SvREADONLY(sv)
2441 ? "a readonly value" : "a temporary";
2442 goto croak;
2443 }
2444 }
2445 }
2446
e02ce34b 2447 leave_adjust_stacks(oldsp, oldsp, gimme, is_lval ? 3 : 2);
799da9d7 2448 }
3bdf583b 2449 }
57486a97 2450
2f450c1b 2451 CX_LEAVE_SCOPE(cx);
a73d8813 2452 cx_popsub(cx); /* Stack values are safe: release CV and @_ ... */
ed8ff0f3 2453 cx_popblock(cx);
5da525e9
DM		 2454 retop = cx->blk_sub.retop;
2455 CX_POP(cx);
57486a97 2456
5da525e9 2457 return retop;
3bdf583b
FC		 2458}
2459
57486a97 2460
a0d0e21e
LW		 2461PP(pp_return)
2462{
20b7effb 2463 dSP; dMARK;
eb578fdb 2464 PERL_CONTEXT *cx;
20ef288c 2465 const I32 cxix = dopoptosub(cxstack_ix);
0bd48802 2466
d40dc6b1
DM		 2467 assert(cxstack_ix >= 0);
2468 if (cxix < cxstack_ix) {
2469 if (cxix < 0) {
79646418
DM		 2470 if (!( PL_curstackinfo->si_type == PERLSI_SORT
2471 || ( PL_curstackinfo->si_type == PERLSI_MULTICALL
2472 && (cxstack[0].cx_type & CXp_SUB_RE_FAKE))
2473 )
2474 )
3089a108 2475 DIE(aTHX_ "Can't return outside a subroutine");
79646418
DM		 2476 /* We must be in:
2477 * a sort block, which is a CXt_NULL not a CXt_SUB;
2478 * or a /(?{...})/ block.
2479 * Handle specially. */
2480 assert(CxTYPE(&cxstack[0]) == CXt_NULL
2481 || ( CxTYPE(&cxstack[0]) == CXt_SUB
2482 && (cxstack[0].cx_type & CXp_SUB_RE_FAKE)));
3089a108
DM		 2483 if (cxstack_ix > 0) {
2484 /* See comment below about context popping. Since we know
2485 * we're scalar and not lvalue, we can preserve the return
2486 * value in a simpler fashion than there. */
2487 SV *sv = *SP;
d40dc6b1 2488 assert(cxstack[0].blk_gimme == G_SCALAR);
3089a108
DM		 2489 if ( (sp != PL_stack_base)
2490 && !(SvFLAGS(sv) & (SVs_TEMP|SVs_PADTMP))
2491 )
2492 *SP = sv_mortalcopy(sv);
2493 dounwind(0);
d40dc6b1 2494 }
3089a108
DM		 2495 /* caller responsible for popping cxstack[0] */
2496 return 0;
d40dc6b1 2497 }
3089a108
DM		 2498
2499 /* There are contexts that need popping. Doing this may free the
c349b9a0 2500 * return value(s), so preserve them first: e.g. popping the plain
3089a108
DM		 2501 * loop here would free $x:
2502 * sub f { { my $x = 1; return $x } }
2503 * We may also need to shift the args down; for example,
2504 * for (1,2) { return 3,4 }
c349b9a0
DM		 2505 * leaves 1,2,3,4 on the stack. Both these actions will be done by
2506 * leave_adjust_stacks(), along with freeing any temps. Note that
2507 * whoever we tail-call (e.g. pp_leaveeval) will also call
2508 * leave_adjust_stacks(); however, the second call is likely to
2509 * just see a bunch of SvTEMPs with a ref count of 1, and so just
2510 * pass them through, rather than copying them again. So this
2511 * isn't as inefficient as it sounds.
3089a108
DM		 2512 */
2513 cx = &cxstack[cxix];
3089a108 2514 PUTBACK;
e02ce34b
DM		 2515 if (cx->blk_gimme != G_VOID)
2516 leave_adjust_stacks(MARK, PL_stack_base + cx->blk_oldsp,
fc6e609e
DM		 2517 cx->blk_gimme,
2518 CxTYPE(cx) == CXt_SUB && CvLVALUE(cx->blk_sub.cv)
2519 ? 3 : 0);
0663a8f8 2520 SPAGAIN;
a0d0e21e 2521 dounwind(cxix);
42831ce4 2522 cx = &cxstack[cxix]; /* CX stack may have been realloced */
d40dc6b1 2523 }
3089a108
DM		 2524 else {
2525 /* Like in the branch above, we need to handle any extra junk on
2526 * the stack. But because we're not also popping extra contexts, we
2527 * don't have to worry about prematurely freeing args. So we just
2528 * need to do the bare minimum to handle junk, and leave the main
2529 * arg processing in the function we tail call, e.g. pp_leavesub.
2530 * In list context we have to splice out the junk; in scalar
2531 * context we can leave as-is (pp_leavesub will later return the
2532 * top stack element). But for an empty arg list, e.g.
2533 * for (1,2) { return }
2534 * we need to set sp = oldsp so that pp_leavesub knows to push
2535 * &PL_sv_undef onto the stack.
2536 */
3ebe7c5a
DM		 2537 SV **oldsp;
2538 cx = &cxstack[cxix];
2539 oldsp = PL_stack_base + cx->blk_oldsp;
2540 if (oldsp != MARK) {
2541 SSize_t nargs = SP - MARK;
2542 if (nargs) {
2543 if (cx->blk_gimme == G_ARRAY) {
2544 /* shift return args to base of call stack frame */
2545 Move(MARK + 1, oldsp + 1, nargs, SV*);
2546 PL_stack_sp = oldsp + nargs;
2547 }
6228a1e1 2548 }
3ebe7c5a
DM		 2549 else
2550 PL_stack_sp = oldsp;
13929c4c 2551 }
3089a108 2552 }
617a4f41
DM		 2553
2554 /* fall through to a normal exit */
2555 switch (CxTYPE(cx)) {
2556 case CXt_EVAL:
2557 return CxTRYBLOCK(cx)
2558 ? Perl_pp_leavetry(aTHX)
2559 : Perl_pp_leaveeval(aTHX);
2560 case CXt_SUB:
13929c4c 2561 return CvLVALUE(cx->blk_sub.cv)
31ccb4f5 2562 ? Perl_pp_leavesublv(aTHX)
13929c4c 2563 : Perl_pp_leavesub(aTHX);
7766f137 2564 case CXt_FORMAT:
617a4f41 2565 return Perl_pp_leavewrite(aTHX);
a0d0e21e 2566 default:
5637ef5b 2567 DIE(aTHX_ "panic: return, type=%u", (unsigned) CxTYPE(cx));
a0d0e21e 2568 }
a0d0e21e
LW		 2569}
2570
42b5eca0 2571/* find the enclosing loop or labelled loop and dounwind() back to it. */
4f443c3d 2572
31705cda 2573static PERL_CONTEXT *
42b5eca0 2574S_unwind_loop(pTHX)
a0d0e21e 2575{
a0d0e21e 2576 I32 cxix;
1f039d60
FC		 2577 if (PL_op->op_flags & OPf_SPECIAL) {
2578 cxix = dopoptoloop(cxstack_ix);
2579 if (cxix < 0)
2580 /* diag_listed_as: Can't "last" outside a loop block */
42b5eca0
DM		 2581 Perl_croak(aTHX_ "Can't \"%s\" outside a loop block",
2582 OP_NAME(PL_op));
1f039d60
FC		 2583 }
2584 else {
2585 dSP;
2586 STRLEN label_len;
2587 const char * const label =
2588 PL_op->op_flags & OPf_STACKED
2589 ? SvPV(TOPs,label_len)
2590 : (label_len = strlen(cPVOP->op_pv), cPVOP->op_pv);
2591 const U32 label_flags =
2592 PL_op->op_flags & OPf_STACKED
2593 ? SvUTF8(POPs)
2594 : (cPVOP->op_private & OPpPV_IS_UTF8) ? SVf_UTF8 : 0;
2595 PUTBACK;
2596 cxix = dopoptolabel(label, label_len, label_flags);
2597 if (cxix < 0)
2598 /* diag_listed_as: Label not found for "last %s" */
147e3846 2599 Perl_croak(aTHX_ "Label not found for \"%s %" SVf "\"",
42b5eca0 2600 OP_NAME(PL_op),
1f039d60
FC		 2601 SVfARG(PL_op->op_flags & OPf_STACKED
2602 && !SvGMAGICAL(TOPp1s)
2603 ? TOPp1s
2604 : newSVpvn_flags(label,
2605 label_len,
2606 label_flags | SVs_TEMP)));
2607 }
2608 if (cxix < cxstack_ix)
2609 dounwind(cxix);
dc7f00ca 2610 return &cxstack[cxix];
1f039d60
FC		 2611}
2612
dc7f00ca 2613
1f039d60
FC		 2614PP(pp_last)
2615{
eb578fdb 2616 PERL_CONTEXT *cx;
5da525e9 2617 OP* nextop;
9d4ba2ae 2618
42b5eca0 2619 cx = S_unwind_loop(aTHX);
4df352a8 2620
93661e56 2621 assert(CxTYPE_is_LOOP(cx));
1bef65a2
DM		 2622 PL_stack_sp = PL_stack_base
2623 + (CxTYPE(cx) == CXt_LOOP_LIST
2624 ? cx->blk_loop.state_u.stack.basesp
2625 : cx->blk_oldsp
2626 );
a0d0e21e 2627
a1f49e72 2628 TAINT_NOT;
f86702cc
PP		 2629
2630 /* Stack values are safe: */
2f450c1b 2631 CX_LEAVE_SCOPE(cx);
d1b6bf72 2632 cx_poploop(cx); /* release loop vars ... */
ed8ff0f3 2633 cx_popblock(cx);
5da525e9
DM		 2634 nextop = cx->blk_loop.my_op->op_lastop->op_next;
2635 CX_POP(cx);
a0d0e21e 2636
5da525e9 2637 return nextop;
a0d0e21e
LW		 2638}
2639
2640PP(pp_next)
2641{
eb578fdb 2642 PERL_CONTEXT *cx;
a0d0e21e 2643
cd97dc8d
DM		 2644 /* if not a bare 'next' in the main scope, search for it */
2645 cx = CX_CUR();
2646 if (!((PL_op->op_flags & OPf_SPECIAL) && CxTYPE_is_LOOP(cx)))
2647 cx = S_unwind_loop(aTHX);
a0d0e21e 2648
ed8ff0f3 2649 cx_topblock(cx);
3a1b2b9e 2650 PL_curcop = cx->blk_oldcop;
47c9d59f 2651 PERL_ASYNC_CHECK();
d57ce4df 2652 return (cx)->blk_loop.my_op->op_nextop;
a0d0e21e
LW		 2653}
2654
2655PP(pp_redo)
2656{
42b5eca0 2657 PERL_CONTEXT *cx = S_unwind_loop(aTHX);
dc7f00ca 2658 OP* redo_op = cx->blk_loop.my_op->op_redoop;
a0d0e21e 2659
a034e688
DM		 2660 if (redo_op->op_type == OP_ENTER) {
2661 /* pop one less context to avoid $x being freed in while (my $x..) */
2662 cxstack_ix++;
dc7f00ca
DM		 2663 cx = CX_CUR();
2664 assert(CxTYPE(cx) == CXt_BLOCK);
a034e688
DM		 2665 redo_op = redo_op->op_next;
2666 }
2667
936c78b5 2668 FREETMPS;
ef588991 2669 CX_LEAVE_SCOPE(cx);
ed8ff0f3 2670 cx_topblock(cx);
3a1b2b9e 2671 PL_curcop = cx->blk_oldcop;
47c9d59f 2672 PERL_ASYNC_CHECK();
a034e688 2673 return redo_op;
a0d0e21e
LW		 2674}
2675
6d90e983 2676#define UNENTERABLE (OP *)1
4bfb5532 2677#define GOTO_DEPTH 64
6d90e983 2678
0824fdcb 2679STATIC OP *
5db1eb8d 2680S_dofindlabel(pTHX_ OP *o, const char *label, STRLEN len, U32 flags, OP **opstack, OP **oplimit)
a0d0e21e 2681{
a0d0e21e 2682 OP **ops = opstack;
a1894d81 2683 static const char* const too_deep = "Target of goto is too deeply nested";
a0d0e21e 2684
7918f24d
NC		 2685 PERL_ARGS_ASSERT_DOFINDLABEL;
2686
fc36a67e 2687 if (ops >= oplimit)
0157ef98 2688 Perl_croak(aTHX_ "%s", too_deep);
11343788
MB		 2689 if (o->op_type == OP_LEAVE ||
2690 o->op_type == OP_SCOPE ||
2691 o->op_type == OP_LEAVELOOP ||
33d34e4c 2692 o->op_type == OP_LEAVESUB ||
7896dde7
Z		 2693 o->op_type == OP_LEAVETRY ||
2694 o->op_type == OP_LEAVEGIVEN)
fc36a67e 2695 {
5dc0d613 2696 *ops++ = cUNOPo->op_first;
fc36a67e 2697 }
4bfb5532
FC		 2698 else if (oplimit - opstack < GOTO_DEPTH) {
2699 if (o->op_flags & OPf_KIDS
6d90e983
FC		 2700 && cUNOPo->op_first->op_type == OP_PUSHMARK) {
2701 *ops++ = UNENTERABLE;
4bfb5532
FC		 2702 }
2703 else if (o->op_flags & OPf_KIDS && PL_opargs[o->op_type]
6d90e983
FC		 2704 && OP_CLASS(o) != OA_LOGOP
2705 && o->op_type != OP_LINESEQ
2706 && o->op_type != OP_SREFGEN
4d7e83bb 2707 && o->op_type != OP_ENTEREVAL
c1cc29fd 2708 && o->op_type != OP_GLOB
6d90e983
FC		 2709 && o->op_type != OP_RV2CV) {
2710 OP * const kid = cUNOPo->op_first;
2711 if (OP_GIMME(kid, 0) != G_SCALAR || OpHAS_SIBLING(kid))
2712 *ops++ = UNENTERABLE;
4bfb5532 2713 }
6d90e983
FC		 2714 }
2715 if (ops >= oplimit)
2716 Perl_croak(aTHX_ "%s", too_deep);
c4aa4e48 2717 *ops = 0;
11343788 2718 if (o->op_flags & OPf_KIDS) {
aec46f14 2719 OP *kid;
b4dcd72d 2720 OP * const kid1 = cUNOPo->op_first;
a0d0e21e 2721 /* First try all the kids at this level, since that's likeliest. */
e6dae479 2722 for (kid = cUNOPo->op_first; kid; kid = OpSIBLING(kid)) {
7e8f1eac 2723 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) {
5db1eb8d
BF		 2724 STRLEN kid_label_len;
2725 U32 kid_label_flags;
2726 const char *kid_label = CopLABEL_len_flags(kCOP,
2727 &kid_label_len, &kid_label_flags);
2728 if (kid_label && (
2729 ( (kid_label_flags & SVf_UTF8) != (flags & SVf_UTF8) ) ?
2730 (flags & SVf_UTF8)
2731 ? (bytes_cmp_utf8(
2732 (const U8*)kid_label, kid_label_len,
2733 (const U8*)label, len) == 0)
2734 : (bytes_cmp_utf8(
2735 (const U8*)label, len,
2736 (const U8*)kid_label, kid_label_len) == 0)
eade7155
BF		 2737 : ( len == kid_label_len && ((kid_label == label)
2738 || memEQ(kid_label, label, len)))))
7e8f1eac
AD		 2739 return kid;
2740 }
a0d0e21e 2741 }
e6dae479 2742 for (kid = cUNOPo->op_first; kid; kid = OpSIBLING(kid)) {
b4dcd72d 2743 bool first_kid_of_binary = FALSE;
3280af22 2744 if (kid == PL_lastgotoprobe)
a0d0e21e 2745 continue;
ed8d0fe2
SM		 2746 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) {
2747 if (ops == opstack)
2748 *ops++ = kid;
6d90e983
FC		 2749 else if (ops[-1] != UNENTERABLE
2750 && (ops[-1]->op_type == OP_NEXTSTATE ||
2751 ops[-1]->op_type == OP_DBSTATE))
ed8d0fe2
SM		 2752 ops[-1] = kid;
2753 else
2754 *ops++ = kid;
2755 }
b4dcd72d
FC		 2756 if (kid == kid1 && ops != opstack && ops[-1] == UNENTERABLE) {
2757 first_kid_of_binary = TRUE;
2758 ops--;
2759 }
5db1eb8d 2760 if ((o = dofindlabel(kid, label, len, flags, ops, oplimit)))
11343788 2761 return o;
b4dcd72d
FC		 2762 if (first_kid_of_binary)
2763 *ops++ = UNENTERABLE;
a0d0e21e
LW		 2764 }
2765 }
c4aa4e48 2766 *ops = 0;
a0d0e21e
LW		 2767 return 0;
2768}
2769
b1c05ba5 2770
b5377742
FC		 2771static void
2772S_check_op_type(pTHX_ OP * const o)
2773{
2774 /* Eventually we may want to stack the needed arguments
2775 * for each op. For now, we punt on the hard ones. */
2776 /* XXX This comment seems to me like wishful thinking. --sprout */
6d90e983
FC		 2777 if (o == UNENTERABLE)
2778 Perl_croak(aTHX_
2779 "Can't \"goto\" into a binary or list expression");
b5377742
FC		 2780 if (o->op_type == OP_ENTERITER)
2781 Perl_croak(aTHX_
2782 "Can't \"goto\" into the middle of a foreach loop");
a01f4640
FC		 2783 if (o->op_type == OP_ENTERGIVEN)
2784 Perl_croak(aTHX_
2785 "Can't \"goto\" into a \"given\" block");
b5377742
FC		 2786}
2787
b1c05ba5
DM		 2788/* also used for: pp_dump() */
2789
2790PP(pp_goto)
a0d0e21e 2791{
27da23d5 2792 dVAR; dSP;
cbbf8932 2793 OP *retop = NULL;
a0d0e21e 2794 I32 ix;
eb578fdb 2795 PERL_CONTEXT *cx;
fc36a67e 2796 OP *enterops[GOTO_DEPTH];
cbbf8932 2797 const char *label = NULL;
5db1eb8d
BF		 2798 STRLEN label_len = 0;
2799 U32 label_flags = 0;
bfed75c6 2800 const bool do_dump = (PL_op->op_type == OP_DUMP);
a1894d81 2801 static const char* const must_have_label = "goto must have label";
a0d0e21e 2802
533c011a 2803 if (PL_op->op_flags & OPf_STACKED) {
7d1d69cb
DM		 2804 /* goto EXPR or goto &foo */
2805
9d4ba2ae 2806 SV * const sv = POPs;
55b37f1c 2807 SvGETMAGIC(sv);
a0d0e21e 2808
a0d0e21e 2809 if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVCV) {
0fa3d31d 2810 /* This egregious kludge implements goto &subroutine */
a0d0e21e 2811 I32 cxix;
eb578fdb 2812 PERL_CONTEXT *cx;
ea726b52 2813 CV *cv = MUTABLE_CV(SvRV(sv));
049bd5ff 2814 AV *arg = GvAV(PL_defgv);
a0d0e21e 2815
5d52e310 2816 while (!CvROOT(cv) && !CvXSUB(cv)) {
7fc63493 2817 const GV * const gv = CvGV(cv);
e8f7dd13 2818 if (gv) {
7fc63493 2819 GV *autogv;
e8f7dd13
GS		 2820 SV *tmpstr;
2821 /* autoloaded stub? */
2822 if (cv != GvCV(gv) && (cv = GvCV(gv)))
5d52e310 2823 continue;
c271df94
BF		 2824 autogv = gv_autoload_pvn(GvSTASH(gv), GvNAME(gv),
2825 GvNAMELEN(gv),
2826 GvNAMEUTF8(gv) ? SVf_UTF8 : 0);
e8f7dd13 2827 if (autogv && (cv = GvCV(autogv)))
5d52e310 2828 continue;
e8f7dd13 2829 tmpstr = sv_newmortal();
c445ea15 2830 gv_efullname3(tmpstr, gv, NULL);
147e3846 2831 DIE(aTHX_ "Goto undefined subroutine &%" SVf, SVfARG(tmpstr));
4aa0a1f7 2832 }
cea2e8a9 2833 DIE(aTHX_ "Goto undefined subroutine");
4aa0a1f7
AD		 2834 }
2835
20ef288c 2836 cxix = dopoptosub(cxstack_ix);
d338c0c2
DM		 2837 if (cxix < 0) {
2838 DIE(aTHX_ "Can't goto subroutine outside a subroutine");
8da3792e 2839 }
d338c0c2 2840 cx = &cxstack[cxix];
564abe23 2841 /* ban goto in eval: see <20050521150056.GC20213@iabyn.com> */
2d43a17f 2842 if (CxTYPE(cx) == CXt_EVAL) {
c74ace89 2843 if (CxREALEVAL(cx))
00455a92 2844 /* diag_listed_as: Can't goto subroutine from an eval-%s */
c74ace89
DM		 2845 DIE(aTHX_ "Can't goto subroutine from an eval-string");
2846 else
00455a92 2847 /* diag_listed_as: Can't goto subroutine from an eval-%s */
c74ace89 2848 DIE(aTHX_ "Can't goto subroutine from an eval-block");
2d43a17f 2849 }
9850bf21
RH		 2850 else if (CxMULTICALL(cx))
2851 DIE(aTHX_ "Can't goto subroutine from a sort sub (or similar callback)");
d338c0c2
DM		 2852
2853 /* First do some returnish stuff. */
2854
2855 SvREFCNT_inc_simple_void(cv); /* avoid premature free during unwind */
2856 FREETMPS;
2857 if (cxix < cxstack_ix) {
2858 dounwind(cxix);
2859 }
7e637ba4 2860 cx = CX_CUR();
ed8ff0f3 2861 cx_topblock(cx);
d338c0c2 2862 SPAGAIN;
39de75fd 2863
8ae997c5
DM		 2864 /* protect @_ during save stack unwind. */
2865 if (arg)
2866 SvREFCNT_inc_NN(sv_2mortal(MUTABLE_SV(arg)));
2867
2868 assert(PL_scopestack_ix == cx->blk_oldscopesp);
dfe0f39b 2869 CX_LEAVE_SCOPE(cx);
8ae997c5 2870
bafb2adc 2871 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)) {
a73d8813 2872 /* this is part of cx_popsub_args() */
9513529b 2873 AV* av = MUTABLE_AV(PAD_SVl(0));
e2657e18
DM		 2874 assert(AvARRAY(MUTABLE_AV(
2875 PadlistARRAY(CvPADLIST(cx->blk_sub.cv))[
2876 CvDEPTH(cx->blk_sub.cv)])) == PL_curpad);
2877
f72bdec3
DM		 2878 /* we are going to donate the current @_ from the old sub
2879 * to the new sub. This first part of the donation puts a
2880 * new empty AV in the pad[0] slot of the old sub,
2881 * unless pad[0] and @_ differ (e.g. if the old sub did
2882 * local *_ = []); in which case clear the old pad[0]
2883 * array in the usual way */
95b2f486
DM		 2884 if (av == arg || AvREAL(av))
2885 clear_defarray(av, av == arg);
049bd5ff 2886 else CLEAR_ARGARRAY(av);
a0d0e21e 2887 }
88c11d84 2888
b1e25d05
DM		 2889 /* don't restore PL_comppad here. It won't be needed if the
2890 * sub we're going to is non-XS, but restoring it early then
2891 * croaking (e.g. the "Goto undefined subroutine" below)
2892 * means the CX block gets processed again in dounwind,
2893 * but this time with the wrong PL_comppad */
88c11d84 2894
1d59c038
FC		 2895 /* A destructor called during LEAVE_SCOPE could have undefined
2896 * our precious cv. See bug #99850. */
2897 if (!CvROOT(cv) && !CvXSUB(cv)) {
2898 const GV * const gv = CvGV(cv);
2899 if (gv) {
2900 SV * const tmpstr = sv_newmortal();
2901 gv_efullname3(tmpstr, gv, NULL);
147e3846 2902 DIE(aTHX_ "Goto undefined subroutine &%" SVf,
1d59c038
FC		 2903 SVfARG(tmpstr));
2904 }
2905 DIE(aTHX_ "Goto undefined subroutine");
2906 }
2907
cd17cc2e
DM		 2908 if (CxTYPE(cx) == CXt_SUB) {
2909 CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth;
2910 SvREFCNT_dec_NN(cx->blk_sub.cv);
2911 }
2912
a0d0e21e 2913 /* Now do some callish stuff. */
aed2304a 2914 if (CvISXSUB(cv)) {
ad39f3a2 2915 const SSize_t items = arg ? AvFILL(arg) + 1 : 0;
cd313eb4 2916 const bool m = arg ? cBOOL(SvRMAGICAL(arg)) : 0;
049bd5ff
FC		 2917 SV** mark;
2918
8ae997c5 2919 ENTER;
80774f05
DM		 2920 SAVETMPS;
2921 SAVEFREESV(cv); /* later, undo the 'avoid premature free' hack */
2922
049bd5ff 2923 /* put GvAV(defgv) back onto stack */
8c9d3376
FC		 2924 if (items) {
2925 EXTEND(SP, items+1); /* @_ could have been extended. */
8c9d3376 2926 }
049bd5ff 2927 mark = SP;
ad39f3a2 2928 if (items) {
de935cc9 2929 SSize_t index;
ad39f3a2 2930 bool r = cBOOL(AvREAL(arg));
b1464ded 2931 for (index=0; index<items; index++)
ad39f3a2
FC		 2932 {
2933 SV *sv;
2934 if (m) {
2935 SV ** const svp = av_fetch(arg, index, 0);
2936 sv = svp ? *svp : NULL;
dd2a7f90 2937 }
ad39f3a2
FC		 2938 else sv = AvARRAY(arg)[index];
2939 SP[index+1] = sv
2940 ? r ? SvREFCNT_inc_NN(sv_2mortal(sv)) : sv
2941 : sv_2mortal(newSVavdefelem(arg, index, 1));
2942 }
049bd5ff 2943 }
ad39f3a2 2944 SP += items;
049bd5ff
FC		 2945 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)) {
2946 /* Restore old @_ */
b405d38b 2947 CX_POP_SAVEARRAY(cx);
b1464ded 2948 }
1fa4e549 2949
51eb35b5 2950 retop = cx->blk_sub.retop;
b1e25d05
DM		 2951 PL_comppad = cx->blk_sub.prevcomppad;
2952 PL_curpad = LIKELY(PL_comppad) ? AvARRAY(PL_comppad) : NULL;
8ae997c5
DM		 2953
2954 /* XS subs don't have a CXt_SUB, so pop it;
ed8ff0f3
DM		 2955 * this is a cx_popblock(), less all the stuff we already did
2956 * for cx_topblock() earlier */
8ae997c5 2957 PL_curcop = cx->blk_oldcop;
5da525e9 2958 CX_POP(cx);
8ae997c5 2959
b37c2d43
AL		 2960 /* Push a mark for the start of arglist */
2961 PUSHMARK(mark);
2962 PUTBACK;
2963 (void)(*CvXSUB(cv))(aTHX_ cv);
a57c6685 2964 LEAVE;
51eb35b5 2965 goto _return;
a0d0e21e
LW		 2966 }
2967 else {
b70d5558 2968 PADLIST * const padlist = CvPADLIST(cv);
39de75fd 2969
80774f05
DM		 2970 SAVEFREESV(cv); /* later, undo the 'avoid premature free' hack */
2971
a73d8813 2972 /* partial unrolled cx_pushsub(): */
39de75fd 2973
a0d0e21e 2974 cx->blk_sub.cv = cv;
1a5b3db4 2975 cx->blk_sub.olddepth = CvDEPTH(cv);
dd2155a4 2976
a0d0e21e 2977 CvDEPTH(cv)++;
2c50b7ed
DM		 2978 SvREFCNT_inc_simple_void_NN(cv);
2979 if (CvDEPTH(cv) > 1) {
2b9dff67 2980 if (CvDEPTH(cv) == PERL_SUB_DEPTH_WARN && ckWARN(WARN_RECURSION))
44a8e56a 2981 sub_crush_depth(cv);
26019298 2982 pad_push(padlist, CvDEPTH(cv));
a0d0e21e 2983 }
426a09cd 2984 PL_curcop = cx->blk_oldcop;
fd617465 2985 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
bafb2adc 2986 if (CxHASARGS(cx))
6d4ff0d2 2987 {
f72bdec3
DM		 2988 /* second half of donating @_ from the old sub to the
2989 * new sub: abandon the original pad[0] AV in the
2990 * new sub, and replace it with the donated @_.
2991 * pad[0] takes ownership of the extra refcount
2992 * we gave arg earlier */
bfa371b6
FC		 2993 if (arg) {
2994 SvREFCNT_dec(PAD_SVl(0));
fed4514a 2995 PAD_SVl(0) = (SV *)arg;
13122036 2996 SvREFCNT_inc_simple_void_NN(arg);
bfa371b6 2997 }
049bd5ff
FC		 2998
2999 /* GvAV(PL_defgv) might have been modified on scope
f72bdec3 3000 exit, so point it at arg again. */
049bd5ff
FC		 3001 if (arg != GvAV(PL_defgv)) {
3002 AV * const av = GvAV(PL_defgv);
3003 GvAV(PL_defgv) = (AV *)SvREFCNT_inc_simple(arg);
3004 SvREFCNT_dec(av);
a0d0e21e
LW		 3005 }
3006 }
13122036 3007
491527d0 3008 if (PERLDB_SUB) { /* Checking curstash breaks DProf. */
005a8a35 3009 Perl_get_db_sub(aTHX_ NULL, cv);
b37c2d43 3010 if (PERLDB_GOTO) {
b96d8cd9 3011 CV * const gotocv = get_cvs("DB::goto", 0);
b37c2d43
AL		 3012 if (gotocv) {
3013 PUSHMARK( PL_stack_sp );
ad64d0ec 3014 call_sv(MUTABLE_SV(gotocv), G_SCALAR | G_NODEBUG);
b37c2d43
AL		 3015 PL_stack_sp--;
3016 }
491527d0 3017 }
1ce6579f 3018 }
51eb35b5
DD		 3019 retop = CvSTART(cv);
3020 goto putback_return;
a0d0e21e
LW		 3021 }
3022 }
1614b0e3 3023 else {
7d1d69cb 3024 /* goto EXPR */
55b37f1c 3025 label = SvPV_nomg_const(sv, label_len);
5db1eb8d 3026 label_flags = SvUTF8(sv);
1614b0e3 3027 }
a0d0e21e 3028 }
2fc690dc 3029 else if (!(PL_op->op_flags & OPf_SPECIAL)) {
7d1d69cb 3030 /* goto LABEL or dump LABEL */
5db1eb8d
BF		 3031 label = cPVOP->op_pv;
3032 label_flags = (cPVOP->op_private & OPpPV_IS_UTF8) ? SVf_UTF8 : 0;
3033 label_len = strlen(label);
3034 }
0157ef98 3035 if (!(do_dump || label_len)) DIE(aTHX_ "%s", must_have_label);
a0d0e21e 3036
f410a211
NC		 3037 PERL_ASYNC_CHECK();
3038
3532f34a 3039 if (label_len) {
cbbf8932 3040 OP *gotoprobe = NULL;
3b2447bc 3041 bool leaving_eval = FALSE;
33d34e4c 3042 bool in_block = FALSE;
3c157b3c 3043 bool pseudo_block = FALSE;
cbbf8932 3044 PERL_CONTEXT *last_eval_cx = NULL;
a0d0e21e
LW		 3045
3046 /* find label */
3047
d4c19fe8 3048 PL_lastgotoprobe = NULL;
a0d0e21e
LW		 3049 *enterops = 0;
3050 for (ix = cxstack_ix; ix >= 0; ix--) {
3051 cx = &cxstack[ix];
6b35e009 3052 switch (CxTYPE(cx)) {
a0d0e21e 3053 case CXt_EVAL:
3b2447bc 3054 leaving_eval = TRUE;
971ecbe6 3055 if (!CxTRYBLOCK(cx)) {
a4f3a277
RH		 3056 gotoprobe = (last_eval_cx ?
3057 last_eval_cx->blk_eval.old_eval_root :
3058 PL_eval_root);
3059 last_eval_cx = cx;
9c5794fe
RH		 3060 break;
3061 }
3062 /* else fall through */
93661e56
DM		 3063 case CXt_LOOP_PLAIN:
3064 case CXt_LOOP_LAZYIV:
3065 case CXt_LOOP_LAZYSV:
3066 case CXt_LOOP_LIST:
3067 case CXt_LOOP_ARY:
7896dde7
Z		 3068 case CXt_GIVEN:
3069 case CXt_WHEN:
e6dae479 3070 gotoprobe = OpSIBLING(cx->blk_oldcop);
a0d0e21e
LW		 3071 break;
3072 case CXt_SUBST:
3073 continue;
3074 case CXt_BLOCK:
33d34e4c 3075 if (ix) {
e6dae479 3076 gotoprobe = OpSIBLING(cx->blk_oldcop);
33d34e4c
AE		 3077 in_block = TRUE;
3078 } else
3280af22 3079 gotoprobe = PL_main_root;
a0d0e21e 3080 break;
b3933176 3081 case CXt_SUB:
3c157b3c
Z		 3082 gotoprobe = CvROOT(cx->blk_sub.cv);
3083 pseudo_block = cBOOL(CxMULTICALL(cx));
3084 break;
7766f137 3085 case CXt_FORMAT:
0a753a76 3086 case CXt_NULL:
a651a37d 3087 DIE(aTHX_ "Can't \"goto\" out of a pseudo block");
a0d0e21e
LW		 3088 default:
3089 if (ix)
5637ef5b
NC		 3090 DIE(aTHX_ "panic: goto, type=%u, ix=%ld",
3091 CxTYPE(cx), (long) ix);
3280af22 3092 gotoprobe = PL_main_root;
a0d0e21e
LW		 3093 break;
3094 }
2b597662 3095 if (gotoprobe) {
29e61fd9
DM		 3096 OP *sibl1, *sibl2;
3097
5db1eb8d 3098 retop = dofindlabel(gotoprobe, label, label_len, label_flags,
2b597662
GS		 3099 enterops, enterops + GOTO_DEPTH);
3100 if (retop)
3101 break;
e6dae479 3102 if ( (sibl1 = OpSIBLING(gotoprobe)) &&
29e61fd9 3103 sibl1->op_type == OP_UNSTACK &&
e6dae479 3104 (sibl2 = OpSIBLING(sibl1)))
29e61fd9
DM		 3105 {
3106 retop = dofindlabel(sibl2,
5db1eb8d
BF		 3107 label, label_len, label_flags, enterops,
3108 enterops + GOTO_DEPTH);
eae48c89
Z		 3109 if (retop)
3110 break;
3111 }
2b597662 3112 }
3c157b3c
Z		 3113 if (pseudo_block)
3114 DIE(aTHX_ "Can't \"goto\" out of a pseudo block");
3280af22 3115 PL_lastgotoprobe = gotoprobe;
a0d0e21e
LW		 3116 }
3117 if (!retop)
147e3846 3118 DIE(aTHX_ "Can't find label %" UTF8f,
b17a0679 3119 UTF8fARG(label_flags, label_len, label));
a0d0e21e 3120
3b2447bc
RH		 3121 /* if we're leaving an eval, check before we pop any frames
3122 that we're not going to punt, otherwise the error
3123 won't be caught */
3124
3125 if (leaving_eval && *enterops && enterops[1]) {
3126 I32 i;
3127 for (i = 1; enterops[i]; i++)
b5377742 3128 S_check_op_type(aTHX_ enterops[i]);
3b2447bc
RH		 3129 }
3130
b500e03b 3131 if (*enterops && enterops[1]) {
6d90e983
FC		 3132 I32 i = enterops[1] != UNENTERABLE
3133 && enterops[1]->op_type == OP_ENTER && in_block
3134 ? 2
3135 : 1;
b500e03b 3136 if (enterops[i])
dc6e8de0 3137 deprecate("\"goto\" to jump into a construct");
b500e03b
GG		 3138 }
3139
a0d0e21e
LW		 3140 /* pop unwanted frames */
3141
3142 if (ix < cxstack_ix) {
a0d0e21e 3143 if (ix < 0)
5edb7975 3144 DIE(aTHX_ "panic: docatch: illegal ix=%ld", (long)ix);
a0d0e21e 3145 dounwind(ix);
7e637ba4 3146 cx = CX_CUR();
ed8ff0f3 3147 cx_topblock(cx);
a0d0e21e
LW		 3148 }
3149
3150 /* push wanted frames */
3151
748a9306 3152 if (*enterops && enterops[1]) {
0bd48802 3153 OP * const oldop = PL_op;
6d90e983
FC		 3154 ix = enterops[1] != UNENTERABLE
3155 && enterops[1]->op_type == OP_ENTER && in_block
3156 ? 2
3157 : 1;
33d34e4c 3158 for (; enterops[ix]; ix++) {
533c011a 3159 PL_op = enterops[ix];
b5377742 3160 S_check_op_type(aTHX_ PL_op);
e57923a2
FC		 3161 DEBUG_l( Perl_deb(aTHX_ "pp_goto: Entering %s\n",
3162 OP_NAME(PL_op)));
16c91539 3163 PL_op->op_ppaddr(aTHX);
a0d0e21e 3164 }
533c011a 3165 PL_op = oldop;
a0d0e21e
LW		 3166 }
3167 }
3168
2631bbca 3169 if (do_dump) {
a5f75d66 3170#ifdef VMS
6b88bc9c 3171 if (!retop) retop = PL_main_start;
a5f75d66 3172#endif
3280af22
NIS		 3173 PL_restartop = retop;
3174 PL_do_undump = TRUE;
a0d0e21e
LW		 3175
3176 my_unexec();
3177
3280af22
NIS		 3178 PL_restartop = 0; /* hmm, must be GNU unexec().. */
3179 PL_do_undump = FALSE;
a0d0e21e
LW		 3180 }
3181
51eb35b5
DD		 3182 putback_return:
3183 PL_stack_sp = sp;
3184 _return:
47c9d59f 3185 PERL_ASYNC_CHECK();
51eb35b5 3186 return retop;
a0d0e21e
LW		 3187}
3188
3189PP(pp_exit)
3190{
39644a26 3191 dSP;
a0d0e21e
LW		 3192 I32 anum;
3193
3194 if (MAXARG < 1)
3195 anum = 0;
9d3c658e
FC		 3196 else if (!TOPs) {
3197 anum = 0; (void)POPs;
3198 }
ff0cee69 3199 else {
a0d0e21e 3200 anum = SvIVx(POPs);
d98f61e7 3201#ifdef VMS
5450b4d8
FC		 3202 if (anum == 1
3203 && SvTRUE(cop_hints_fetch_pvs(PL_curcop, "vmsish_exit", 0)))
ff0cee69 3204 anum = 0;
97124ef6
FC		 3205 VMSISH_HUSHED =
3206 VMSISH_HUSHED || (PL_curcop->op_private & OPpHUSH_VMSISH);
ff0cee69
PP		 3207#endif
3208 }
cc3604b1 3209 PL_exit_flags |= PERL_EXIT_EXPECTED;
a0d0e21e 3210 my_exit(anum);
3280af22 3211 PUSHs(&PL_sv_undef);
a0d0e21e
LW		 3212 RETURN;
3213}
3214
a0d0e21e
LW		 3215/* Eval. */
3216
0824fdcb 3217STATIC void
cea2e8a9 3218S_save_lines(pTHX_ AV *array, SV *sv)
a0d0e21e 3219{
504618e9 3220 const char *s = SvPVX_const(sv);
890ce7af 3221 const char * const send = SvPVX_const(sv) + SvCUR(sv);
504618e9 3222 I32 line = 1;
a0d0e21e 3223
7918f24d
NC		 3224 PERL_ARGS_ASSERT_SAVE_LINES;
3225
a0d0e21e 3226 while (s && s < send) {
f54cb97a 3227 const char *t;
b9f83d2f 3228 SV * const tmpstr = newSV_type(SVt_PVMG);
a0d0e21e 3229
1d963ff3 3230 t = (const char *)memchr(s, '\n', send - s);
a0d0e21e
LW		 3231 if (t)
3232 t++;
3233 else
3234 t = send;
3235
3236 sv_setpvn(tmpstr, s, t - s);
3237 av_store(array, line++, tmpstr);
3238 s = t;
3239 }
3240}
3241
22f16304
RU		 3242/*
3243=for apidoc docatch
3244
3245Check for the cases 0 or 3 of cur_env.je_ret, only used inside an eval context.
3246
32470 is used as continue inside eval,
3248
32493 is used for a die caught by an inner eval - continue inner loop
3250
75af9d73 3251See F<cop.h>: je_mustcatch, when set at any runlevel to TRUE, means eval ops must
22f16304
RU		 3252establish a local jmpenv to handle exception traps.
3253
3254=cut
3255*/
0824fdcb 3256STATIC OP *
d7e3f70f 3257S_docatch(pTHX_ Perl_ppaddr_t firstpp)
1e422769 3258{
6224f72b 3259 int ret;
06b5626a 3260 OP * const oldop = PL_op;
db36c5a1 3261 dJMPENV;
1e422769 3262
54310121 3263 assert(CATCH_GET == TRUE);
8bffa5f8 3264
14dd3ad8 3265 JMPENV_PUSH(ret);
6224f72b 3266 switch (ret) {
312caa8e 3267 case 0:
d7e3f70f 3268 PL_op = firstpp(aTHX);
14dd3ad8 3269 redo_body:
85aaa934 3270 CALLRUNOPS(aTHX);
312caa8e
CS		 3271 break;
3272 case 3:
8bffa5f8 3273 /* die caught by an inner eval - continue inner loop */
febb3a6d
Z		 3274 if (PL_restartop && PL_restartjmpenv == PL_top_env) {
3275 PL_restartjmpenv = NULL;
312caa8e
CS		 3276 PL_op = PL_restartop;
3277 PL_restartop = 0;
3278 goto redo_body;
3279 }
924ba076 3280 /* FALLTHROUGH */
312caa8e 3281 default:
14dd3ad8 3282 JMPENV_POP;
533c011a 3283 PL_op = oldop;
6224f72b 3284 JMPENV_JUMP(ret);
e5964223 3285 NOT_REACHED; /* NOTREACHED */
1e422769 3286 }
14dd3ad8 3287 JMPENV_POP;
533c011a 3288 PL_op = oldop;
5f66b61c 3289 return NULL;
1e422769
PP		 3290}
3291
a3985cdc
DM		 3292
3293/*
3294=for apidoc find_runcv
3295
3296Locate the CV corresponding to the currently executing sub or eval.
796b6530
KW		 3297If C<db_seqp> is non_null, skip CVs that are in the DB package and populate
3298C<*db_seqp> with the cop sequence number at the point that the DB:: code was
72d33970
FC		 3299entered. (This allows debuggers to eval in the scope of the breakpoint
3300rather than in the scope of the debugger itself.)
a3985cdc
DM		 3301
3302=cut
3303*/
3304
3305CV*
d819b83a 3306Perl_find_runcv(pTHX_ U32 *db_seqp)
a3985cdc 3307{
db4cf31d 3308 return Perl_find_runcv_where(aTHX_ 0, 0, db_seqp);
70794f7b
FC		 3309}
3310
3311/* If this becomes part of the API, it might need a better name. */
3312CV *
db4cf31d 3313Perl_find_runcv_where(pTHX_ U8 cond, IV arg, U32 *db_seqp)
70794f7b 3314{
a3985cdc 3315 PERL_SI *si;
b4b0692a 3316 int level = 0;
a3985cdc 3317
d819b83a 3318 if (db_seqp)
c3923c33
DM		 3319 *db_seqp =
3320 PL_curcop == &PL_compiling
3321 ? PL_cop_seqmax
3322 : PL_curcop->cop_seq;
3323
a3985cdc 3324 for (si = PL_curstackinfo; si; si = si->si_prev) {
06b5626a 3325 I32 ix;
a3985cdc 3326 for (ix = si->si_cxix; ix >= 0; ix--) {
06b5626a 3327 const PERL_CONTEXT *cx = &(si->si_cxstack[ix]);
70794f7b 3328 CV *cv = NULL;
d819b83a 3329 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
70794f7b 3330 cv = cx->blk_sub.cv;
d819b83a
DM		 3331 /* skip DB:: code */
3332 if (db_seqp && PL_debstash && CvSTASH(cv) == PL_debstash) {
3333 *db_seqp = cx->blk_oldcop->cop_seq;
3334 continue;
3335 }
a453e28a
DM		 3336 if (cx->cx_type & CXp_SUB_RE)
3337 continue;
d819b83a 3338 }
a3985cdc 3339 else if (CxTYPE(cx) == CXt_EVAL && !CxTRYBLOCK(cx))
70794f7b
FC		 3340 cv = cx->blk_eval.cv;
3341 if (cv) {
3342 switch (cond) {
db4cf31d
FC		 3343 case FIND_RUNCV_padid_eq:
3344 if (!CvPADLIST(cv)
b4db5868 3345 || CvPADLIST(cv)->xpadl_id != (U32)arg)
8771da69 3346 continue;
b4b0692a
FC		 3347 return cv;
3348 case FIND_RUNCV_level_eq:
db4cf31d 3349 if (level++ != arg) continue;
2165bd23 3350 /* FALLTHROUGH */
70794f7b
FC		 3351 default:
3352 return cv;
3353 }
3354 }
a3985cdc
DM		 3355 }
3356 }
db4cf31d 3357 return cond == FIND_RUNCV_padid_eq ? NULL : PL_main_cv;
a3985cdc
DM		 3358}
3359
3360
27e90453
DM		 3361/* Run yyparse() in a setjmp wrapper. Returns:
3362 * 0: yyparse() successful
3363 * 1: yyparse() failed
3364 * 3: yyparse() died
3365 */
3366STATIC int
28ac2b49 3367S_try_yyparse(pTHX_ int gramtype)
27e90453
DM		 3368{
3369 int ret;
3370 dJMPENV;
3371
4ebe6e95 3372 assert(CxTYPE(CX_CUR()) == CXt_EVAL);
27e90453
DM		 3373 JMPENV_PUSH(ret);
3374 switch (ret) {
3375 case 0:
28ac2b49 3376 ret = yyparse(gramtype) ? 1 : 0;
27e90453
DM		 3377 break;
3378 case 3:
3379 break;
3380 default:
3381 JMPENV_POP;
3382 JMPENV_JUMP(ret);
e5964223 3383 NOT_REACHED; /* NOTREACHED */
27e90453
DM		 3384 }
3385 JMPENV_POP;
3386 return ret;
3387}