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
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.
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.
19 * [Bilbo on p.35 of _The Lord of the Rings_, I/i: "A Long-Expected Party"]
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.
28 * Control-oriented means things like pp_enteriter() and pp_next(), which
29 * alter the flow of control of the program.
34 #define PERL_IN_PP_CTL_C
37 #define RUN_PP_CATCHABLY(thispp) \
38 STMT_START { if (CATCH_GET) return docatch(thispp); } STMT_END
40 #define dopoptosub(plop) dopoptosub_at(cxstack, (plop))
46 const PERL_CONTEXT *cx;
49 if (PL_op->op_private & OPpOFFBYONE) {
50 if (!(cx = caller_cx(1,NULL))) RETPUSHUNDEF;
53 cxix = dopoptosub(cxstack_ix);
59 switch (cx->blk_gimme) {
78 PMOP *pm = (PMOP*)cLOGOP->op_other;
83 const regexp_engine *eng;
84 bool is_bare_re= FALSE;
86 if (PL_op->op_flags & OPf_STACKED) {
96 /* prevent recompiling under /o and ithreads. */
97 #if defined(USE_ITHREADS)
98 if (pm->op_pmflags & PMf_KEEP && PM_GETRE(pm)) {
105 assert (re != (REGEXP*) &PL_sv_undef);
106 eng = re ? RX_ENGINE(re) : current_re_engine();
108 new_re = (eng->op_comp
110 : &Perl_re_op_compile
111 )(aTHX_ args, nargs, pm->op_code_list, eng, re,
113 (pm->op_pmflags & RXf_PMf_FLAGCOPYMASK),
115 (PL_op->op_flags & OPf_SPECIAL ? PMf_USE_RE_EVAL : 0));
117 if (pm->op_pmflags & PMf_HAS_CV)
118 ReANY(new_re)->qr_anoncv
119 = (CV*) SvREFCNT_inc(PAD_SV(PL_op->op_targ));
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
129 if (pm->op_type == OP_MATCH) {
131 const bool was_tainted = TAINT_get;
132 if (pm->op_flags & OPf_STACKED)
134 else if (pm->op_targ)
135 lhs = PAD_SV(pm->op_targ);
138 /* Restore the previous value of PL_tainted (which may have been
139 modified by get-magic), to avoid incorrectly setting the
140 RXf_TAINTED flag with RX_TAINT_on further down. */
141 TAINT_set(was_tainted);
142 #ifdef NO_TAINT_SUPPORT
143 PERL_UNUSED_VAR(was_tainted);
146 tmp = reg_temp_copy(NULL, new_re);
147 ReREFCNT_dec(new_re);
153 PM_SETRE(pm, new_re);
157 assert(TAINTING_get || !TAINT_get);
159 SvTAINTED_on((SV*)new_re);
163 /* handle the empty pattern */
164 if (!RX_PRELEN(PM_GETRE(pm)) && PL_curpm) {
165 if (PL_curpm == PL_reg_curpm) {
166 if (PL_curpm_under && PL_curpm_under == PL_reg_curpm) {
167 Perl_croak(aTHX_ "Infinite recursion via empty pattern");
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 */
175 if (pm->op_pmflags & PMf_KEEP) {
176 cLOGOP->op_first->op_next = PL_op->op_next;
188 PERL_CONTEXT *cx = CX_CUR();
189 PMOP * const pm = (PMOP*) cLOGOP->op_other;
190 SV * const dstr = cx->sb_dstr;
193 char *orig = cx->sb_orig;
194 REGEXP * const rx = cx->sb_rx;
196 REGEXP *old = PM_GETRE(pm);
203 PM_SETRE(pm,ReREFCNT_inc(rx));
206 rxres_restore(&cx->sb_rxres, rx);
208 if (cx->sb_iters++) {
209 const SSize_t saviters = cx->sb_iters;
210 if (cx->sb_iters > cx->sb_maxiters)
211 DIE(aTHX_ "Substitution loop");
213 SvGETMAGIC(TOPs); /* possibly clear taint on $1 etc: #67962 */
215 /* See "how taint works" above pp_subst() */
216 sv_catsv_nomg(dstr, POPs);
217 if (UNLIKELY(TAINT_get))
218 cx->sb_rxtainted |= SUBST_TAINT_REPL;
219 if (CxONCE(cx) || s < orig ||
220 !CALLREGEXEC(rx, s, cx->sb_strend, orig,
221 (s == m), cx->sb_targ, NULL,
222 (REXEC_IGNOREPOS|REXEC_NOT_FIRST|REXEC_FAIL_ON_UNDERFLOW)))
224 SV *targ = cx->sb_targ;
226 assert(cx->sb_strend >= s);
227 if(cx->sb_strend > s) {
228 if (DO_UTF8(dstr) && !SvUTF8(targ))
229 sv_catpvn_nomg_utf8_upgrade(dstr, s, cx->sb_strend - s, nsv);
231 sv_catpvn_nomg(dstr, s, cx->sb_strend - s);
233 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
234 cx->sb_rxtainted |= SUBST_TAINT_PAT;
236 if (pm->op_pmflags & PMf_NONDESTRUCT) {
238 /* From here on down we're using the copy, and leaving the
239 original untouched. */
243 SV_CHECK_THINKFIRST_COW_DROP(targ);
244 if (isGV(targ)) Perl_croak_no_modify();
246 SvPV_set(targ, SvPVX(dstr));
247 SvCUR_set(targ, SvCUR(dstr));
248 SvLEN_set(targ, SvLEN(dstr));
251 SvPV_set(dstr, NULL);
254 mPUSHi(saviters - 1);
256 (void)SvPOK_only_UTF8(targ);
259 /* update the taint state of various various variables in
260 * preparation for final exit.
261 * See "how taint works" above pp_subst() */
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))
267 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
269 if (!(cx->sb_rxtainted & SUBST_TAINT_BOOLRET)
270 && (cx->sb_rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_PAT))
272 SvTAINTED_on(TOPs); /* taint return value */
273 /* needed for mg_set below */
275 cBOOL(cx->sb_rxtainted &
276 (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL))
280 /* PL_tainted must be correctly set for this mg_set */
289 RETURNOP(pm->op_next);
290 NOT_REACHED; /* NOTREACHED */
292 cx->sb_iters = saviters;
294 if (RX_MATCH_COPIED(rx) && RX_SUBBEG(rx) != orig) {
297 assert(!RX_SUBOFFSET(rx));
298 cx->sb_orig = orig = RX_SUBBEG(rx);
300 cx->sb_strend = s + (cx->sb_strend - m);
302 cx->sb_m = m = RX_OFFS(rx)[0].start + orig;
304 if (DO_UTF8(dstr) && !SvUTF8(cx->sb_targ))
305 sv_catpvn_nomg_utf8_upgrade(dstr, s, m - s, nsv);
307 sv_catpvn_nomg(dstr, s, m-s);
309 cx->sb_s = RX_OFFS(rx)[0].end + orig;
310 { /* Update the pos() information. */
312 = (pm->op_pmflags & PMf_NONDESTRUCT) ? cx->sb_dstr : cx->sb_targ;
315 /* the string being matched against may no longer be a string,
316 * e.g. $_=0; s/.../$_++/ge */
319 SvPV_force_nomg_nolen(sv);
321 if (!(mg = mg_find_mglob(sv))) {
322 mg = sv_magicext_mglob(sv);
324 MgBYTEPOS_set(mg, sv, SvPVX(sv), m - orig);
327 (void)ReREFCNT_inc(rx);
328 /* update the taint state of various various variables in preparation
329 * for calling the code block.
330 * See "how taint works" above pp_subst() */
332 if (RX_MATCH_TAINTED(rx)) /* run time pattern taint, eg locale */
333 cx->sb_rxtainted |= SUBST_TAINT_PAT;
335 if ((cx->sb_rxtainted & SUBST_TAINT_PAT) ||
336 ((cx->sb_rxtainted & (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
337 == (SUBST_TAINT_STR|SUBST_TAINT_RETAINT))
339 (RX_MATCH_TAINTED_on(rx)); /* taint $1 et al */
341 if (cx->sb_iters > 1 && (cx->sb_rxtainted &
342 (SUBST_TAINT_STR|SUBST_TAINT_PAT|SUBST_TAINT_REPL)))
343 SvTAINTED_on((pm->op_pmflags & PMf_NONDESTRUCT)
344 ? cx->sb_dstr : cx->sb_targ);
347 rxres_save(&cx->sb_rxres, rx);
349 RETURNOP(pm->op_pmstashstartu.op_pmreplstart);
353 Perl_rxres_save(pTHX_ void **rsp, REGEXP *rx)
358 PERL_ARGS_ASSERT_RXRES_SAVE;
361 if (!p || p[1] < RX_NPARENS(rx)) {
363 i = 7 + (RX_NPARENS(rx)+1) * 2;
365 i = 6 + (RX_NPARENS(rx)+1) * 2;
374 /* what (if anything) to free on croak */
375 *p++ = PTR2UV(RX_MATCH_COPIED(rx) ? RX_SUBBEG(rx) : NULL);
376 RX_MATCH_COPIED_off(rx);
377 *p++ = RX_NPARENS(rx);
380 *p++ = PTR2UV(RX_SAVED_COPY(rx));
381 RX_SAVED_COPY(rx) = NULL;
384 *p++ = PTR2UV(RX_SUBBEG(rx));
385 *p++ = (UV)RX_SUBLEN(rx);
386 *p++ = (UV)RX_SUBOFFSET(rx);
387 *p++ = (UV)RX_SUBCOFFSET(rx);
388 for (i = 0; i <= RX_NPARENS(rx); ++i) {
389 *p++ = (UV)RX_OFFS(rx)[i].start;
390 *p++ = (UV)RX_OFFS(rx)[i].end;
395 S_rxres_restore(pTHX_ void **rsp, REGEXP *rx)
400 PERL_ARGS_ASSERT_RXRES_RESTORE;
403 RX_MATCH_COPY_FREE(rx);
404 RX_MATCH_COPIED_set(rx, *p);
406 RX_NPARENS(rx) = *p++;
409 if (RX_SAVED_COPY(rx))
410 SvREFCNT_dec (RX_SAVED_COPY(rx));
411 RX_SAVED_COPY(rx) = INT2PTR(SV*,*p);
415 RX_SUBBEG(rx) = INT2PTR(char*,*p++);
416 RX_SUBLEN(rx) = (I32)(*p++);
417 RX_SUBOFFSET(rx) = (I32)*p++;
418 RX_SUBCOFFSET(rx) = (I32)*p++;
419 for (i = 0; i <= RX_NPARENS(rx); ++i) {
420 RX_OFFS(rx)[i].start = (I32)(*p++);
421 RX_OFFS(rx)[i].end = (I32)(*p++);
426 S_rxres_free(pTHX_ void **rsp)
428 UV * const p = (UV*)*rsp;
430 PERL_ARGS_ASSERT_RXRES_FREE;
434 void *tmp = INT2PTR(char*,*p);
437 U32 i = 9 + p[1] * 2;
439 U32 i = 8 + p[1] * 2;
444 SvREFCNT_dec (INT2PTR(SV*,p[2]));
447 PoisonFree(p, i, sizeof(UV));
456 #define FORM_NUM_BLANK (1<<30)
457 #define FORM_NUM_POINT (1<<29)
461 dSP; dMARK; dORIGMARK;
462 SV * const tmpForm = *++MARK;
463 SV *formsv; /* contains text of original format */
464 U32 *fpc; /* format ops program counter */
465 char *t; /* current append position in target string */
466 const char *f; /* current position in format string */
468 SV *sv = NULL; /* current item */
469 const char *item = NULL;/* string value of current item */
470 I32 itemsize = 0; /* length (chars) of item, possibly truncated */
471 I32 itembytes = 0; /* as itemsize, but length in bytes */
472 I32 fieldsize = 0; /* width of current field */
473 I32 lines = 0; /* number of lines that have been output */
474 bool chopspace = (strchr(PL_chopset, ' ') != NULL); /* does $: have space */
475 const char *chophere = NULL; /* where to chop current item */
476 STRLEN linemark = 0; /* pos of start of line in output */
478 bool gotsome = FALSE; /* seen at least one non-blank item on this line */
479 STRLEN len; /* length of current sv */
480 STRLEN linemax; /* estimate of output size in bytes */
481 bool item_is_utf8 = FALSE;
482 bool targ_is_utf8 = FALSE;
485 U8 *source; /* source of bytes to append */
486 STRLEN to_copy; /* how may bytes to append */
487 char trans; /* what chars to translate */
488 bool copied_form = FALSE; /* have we duplicated the form? */
490 mg = doparseform(tmpForm);
492 fpc = (U32*)mg->mg_ptr;
493 /* the actual string the format was compiled from.
494 * with overload etc, this may not match tmpForm */
498 SvPV_force(PL_formtarget, len);
499 if (SvTAINTED(tmpForm) || SvTAINTED(formsv))
500 SvTAINTED_on(PL_formtarget);
501 if (DO_UTF8(PL_formtarget))
503 /* this is an initial estimate of how much output buffer space
504 * to allocate. It may be exceeded later */
505 linemax = (SvCUR(formsv) * (IN_BYTES ? 1 : 3) + 1);
506 t = SvGROW(PL_formtarget, len + linemax + 1);
507 /* XXX from now onwards, SvCUR(PL_formtarget) is invalid */
509 f = SvPV_const(formsv, len);
513 const char *name = "???";
516 case FF_LITERAL: arg = fpc[1]; name = "LITERAL"; break;
517 case FF_BLANK: arg = fpc[1]; name = "BLANK"; break;
518 case FF_SKIP: arg = fpc[1]; name = "SKIP"; break;
519 case FF_FETCH: arg = fpc[1]; name = "FETCH"; break;
520 case FF_DECIMAL: arg = fpc[1]; name = "DECIMAL"; break;
522 case FF_CHECKNL: name = "CHECKNL"; break;
523 case FF_CHECKCHOP: name = "CHECKCHOP"; break;
524 case FF_SPACE: name = "SPACE"; break;
525 case FF_HALFSPACE: name = "HALFSPACE"; break;
526 case FF_ITEM: name = "ITEM"; break;
527 case FF_CHOP: name = "CHOP"; break;
528 case FF_LINEGLOB: name = "LINEGLOB"; break;
529 case FF_NEWLINE: name = "NEWLINE"; break;
530 case FF_MORE: name = "MORE"; break;
531 case FF_LINEMARK: name = "LINEMARK"; break;
532 case FF_END: name = "END"; break;
533 case FF_0DECIMAL: name = "0DECIMAL"; break;
534 case FF_LINESNGL: name = "LINESNGL"; break;
537 PerlIO_printf(Perl_debug_log, "%-16s%ld\n", name, (long) arg);
539 PerlIO_printf(Perl_debug_log, "%-16s\n", name);
542 case FF_LINEMARK: /* start (or end) of a line */
543 linemark = t - SvPVX(PL_formtarget);
548 case FF_LITERAL: /* append <arg> literal chars */
553 item_is_utf8 = targ_is_utf8 ? !!DO_UTF8(formsv) : !!SvUTF8(formsv);
556 case FF_SKIP: /* skip <arg> chars in format */
560 case FF_FETCH: /* get next item and set field size to <arg> */
569 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX), "Not enough format arguments");
572 SvTAINTED_on(PL_formtarget);
575 case FF_CHECKNL: /* find max len of item (up to \n) that fits field */
577 const char *s = item = SvPV_const(sv, len);
578 const char *send = s + len;
581 item_is_utf8 = DO_UTF8(sv);
593 if (itemsize == fieldsize)
596 itembytes = s - item;
601 case FF_CHECKCHOP: /* like CHECKNL, but up to highest split point */
603 const char *s = item = SvPV_const(sv, len);
604 const char *send = s + len;
608 item_is_utf8 = DO_UTF8(sv);
610 /* look for a legal split position */
618 /* provisional split point */
622 /* we delay testing fieldsize until after we've
623 * processed the possible split char directly
624 * following the last field char; so if fieldsize=3
625 * and item="a b cdef", we consume "a b", not "a".
626 * Ditto further down.
628 if (size == fieldsize)
632 if (strchr(PL_chopset, *s)) {
633 /* provisional split point */
634 /* for a non-space split char, we include
635 * the split char; hence the '+1' */
639 if (size == fieldsize)
651 if (!chophere || s == send) {
655 itembytes = chophere - item;
660 case FF_SPACE: /* append padding space (diff of field, item size) */
661 arg = fieldsize - itemsize;
669 case FF_HALFSPACE: /* like FF_SPACE, but only append half as many */
670 arg = fieldsize - itemsize;
679 case FF_ITEM: /* append a text item, while blanking ctrl chars */
685 case FF_CHOP: /* (for ^*) chop the current item */
686 if (sv != &PL_sv_no) {
687 const char *s = chophere;
689 ((sv == tmpForm || SvSMAGICAL(sv))
690 || (SvGMAGICAL(tmpForm) && !sv_only_taint_gmagic(tmpForm))) ) {
691 /* sv and tmpForm are either the same SV, or magic might allow modification
692 of tmpForm when sv is modified, so copy */
693 SV *newformsv = sv_mortalcopy(formsv);
696 f = SvPV_nolen(newformsv) + (f - SvPV_nolen(formsv));
697 Newx(new_compiled, mg->mg_len / sizeof(U32), U32);
698 memcpy(new_compiled, mg->mg_ptr, mg->mg_len);
699 SAVEFREEPV(new_compiled);
700 fpc = new_compiled + (fpc - (U32*)mg->mg_ptr);
712 /* tied, overloaded or similar strangeness.
713 * Do it the hard way */
714 sv_setpvn(sv, s, len - (s-item));
720 case FF_LINESNGL: /* process ^* */
724 case FF_LINEGLOB: /* process @* */
726 const bool oneline = fpc[-1] == FF_LINESNGL;
727 const char *s = item = SvPV_const(sv, len);
728 const char *const send = s + len;
730 item_is_utf8 = DO_UTF8(sv);
741 to_copy = s - item - 1;
755 /* append to_copy bytes from source to PL_formstring.
756 * item_is_utf8 implies source is utf8.
757 * if trans, translate certain characters during the copy */
762 SvCUR_set(PL_formtarget,
763 t - SvPVX_const(PL_formtarget));
765 if (targ_is_utf8 && !item_is_utf8) {
766 source = tmp = bytes_to_utf8(source, &to_copy);
769 if (item_is_utf8 && !targ_is_utf8) {
771 /* Upgrade targ to UTF8, and then we reduce it to
772 a problem we have a simple solution for.
773 Don't need get magic. */
774 sv_utf8_upgrade_nomg(PL_formtarget);
776 /* re-calculate linemark */
777 s = (U8*)SvPVX(PL_formtarget);
778 /* the bytes we initially allocated to append the
779 * whole line may have been gobbled up during the
780 * upgrade, so allocate a whole new line's worth
785 linemark = s - (U8*)SvPVX(PL_formtarget);
787 /* Easy. They agree. */
788 assert (item_is_utf8 == targ_is_utf8);
791 /* @* and ^* are the only things that can exceed
792 * the linemax, so grow by the output size, plus
793 * a whole new form's worth in case of any further
795 grow = linemax + to_copy;
797 SvGROW(PL_formtarget, SvCUR(PL_formtarget) + grow + 1);
798 t = SvPVX(PL_formtarget) + SvCUR(PL_formtarget);
800 Copy(source, t, to_copy, char);
802 /* blank out ~ or control chars, depending on trans.
803 * works on bytes not chars, so relies on not
804 * matching utf8 continuation bytes */
806 U8 *send = s + to_copy;
809 if (trans == '~' ? (ch == '~') : isCNTRL(ch))
816 SvCUR_set(PL_formtarget, SvCUR(PL_formtarget) + to_copy);
822 case FF_0DECIMAL: /* like FF_DECIMAL but for 0### */
825 ((arg & FORM_NUM_POINT) ? "%#0*.*" NVff : "%0*.*" NVff);
828 case FF_DECIMAL: /* do @##, ^##, where <arg>=(precision|flags) */
831 ((arg & FORM_NUM_POINT) ? "%#*.*" NVff : "%*.*" NVff);
833 /* If the field is marked with ^ and the value is undefined,
835 if ((arg & FORM_NUM_BLANK) && !SvOK(sv)) {
843 /* overflow evidence */
844 if (num_overflow(value, fieldsize, arg)) {
850 /* Formats aren't yet marked for locales, so assume "yes". */
852 Size_t max = SvLEN(PL_formtarget) - (t - SvPVX(PL_formtarget));
854 DECLARATION_FOR_LC_NUMERIC_MANIPULATION;
855 STORE_LC_NUMERIC_SET_TO_NEEDED();
856 arg &= ~(FORM_NUM_POINT|FORM_NUM_BLANK);
859 const char* qfmt = quadmath_format_single(fmt);
862 Perl_croak_nocontext("panic: quadmath invalid format \"%s\"", fmt);
863 len = quadmath_snprintf(t, max, qfmt, (int) fieldsize, (int) arg, value);
865 Perl_croak_nocontext("panic: quadmath_snprintf failed, format \"%s\"", qfmt);
870 /* we generate fmt ourselves so it is safe */
871 GCC_DIAG_IGNORE(-Wformat-nonliteral);
872 len = my_snprintf(t, max, fmt, (int) fieldsize, (int) arg, value);
875 PERL_MY_SNPRINTF_POST_GUARD(len, max);
876 RESTORE_LC_NUMERIC();
881 case FF_NEWLINE: /* delete trailing spaces, then append \n */
883 while (t-- > (SvPVX(PL_formtarget) + linemark) && *t == ' ') ;
888 case FF_BLANK: /* for arg==0: do '~'; for arg>0 : do '~~' */
891 if (arg) { /* repeat until fields exhausted? */
897 t = SvPVX(PL_formtarget) + linemark;
902 case FF_MORE: /* replace long end of string with '...' */
904 const char *s = chophere;
905 const char *send = item + len;
907 while (isSPACE(*s) && (s < send))
912 arg = fieldsize - itemsize;
919 if (strBEGINs(s1," ")) {
920 while (s1 > SvPVX_const(PL_formtarget) && isSPACE(s1[-1]))
930 case FF_END: /* tidy up, then return */
932 assert(t < SvPVX_const(PL_formtarget) + SvLEN(PL_formtarget));
934 SvCUR_set(PL_formtarget, t - SvPVX_const(PL_formtarget));
936 SvUTF8_on(PL_formtarget);
937 FmLINES(PL_formtarget) += lines;
939 if (fpc[-1] == FF_BLANK)
940 RETURNOP(cLISTOP->op_first);
947 /* also used for: pp_mapstart() */
953 if (PL_stack_base + TOPMARK == SP) {
955 if (GIMME_V == G_SCALAR)
957 RETURNOP(PL_op->op_next->op_next);
959 PL_stack_sp = PL_stack_base + TOPMARK + 1;
960 Perl_pp_pushmark(aTHX); /* push dst */
961 Perl_pp_pushmark(aTHX); /* push src */
962 ENTER_with_name("grep"); /* enter outer scope */
966 ENTER_with_name("grep_item"); /* enter inner scope */
969 src = PL_stack_base[TOPMARK];
971 src = PL_stack_base[TOPMARK] = sv_mortalcopy(src);
978 if (PL_op->op_type == OP_MAPSTART)
979 Perl_pp_pushmark(aTHX); /* push top */
980 return ((LOGOP*)PL_op->op_next)->op_other;
986 const U8 gimme = GIMME_V;
987 I32 items = (SP - PL_stack_base) - TOPMARK; /* how many new items */
993 /* first, move source pointer to the next item in the source list */
994 ++PL_markstack_ptr[-1];
996 /* if there are new items, push them into the destination list */
997 if (items && gimme != G_VOID) {
998 /* might need to make room back there first */
999 if (items > PL_markstack_ptr[-1] - PL_markstack_ptr[-2]) {
1000 /* XXX this implementation is very pessimal because the stack
1001 * is repeatedly extended for every set of items. Is possible
1002 * to do this without any stack extension or copying at all
1003 * by maintaining a separate list over which the map iterates
1004 * (like foreach does). --gsar */
1006 /* everything in the stack after the destination list moves
1007 * towards the end the stack by the amount of room needed */
1008 shift = items - (PL_markstack_ptr[-1] - PL_markstack_ptr[-2]);
1010 /* items to shift up (accounting for the moved source pointer) */
1011 count = (SP - PL_stack_base) - (PL_markstack_ptr[-1] - 1);
1013 /* This optimization is by Ben Tilly and it does
1014 * things differently from what Sarathy (gsar)
1015 * is describing. The downside of this optimization is
1016 * that leaves "holes" (uninitialized and hopefully unused areas)
1017 * to the Perl stack, but on the other hand this
1018 * shouldn't be a problem. If Sarathy's idea gets
1019 * implemented, this optimization should become
1020 * irrelevant. --jhi */
1022 shift = count; /* Avoid shifting too often --Ben Tilly */
1026 dst = (SP += shift);
1027 PL_markstack_ptr[-1] += shift;
1028 *PL_markstack_ptr += shift;
1032 /* copy the new items down to the destination list */
1033 dst = PL_stack_base + (PL_markstack_ptr[-2] += items) - 1;
1034 if (gimme == G_ARRAY) {
1035 /* add returned items to the collection (making mortal copies
1036 * if necessary), then clear the current temps stack frame
1037 * *except* for those items. We do this splicing the items
1038 * into the start of the tmps frame (so some items may be on
1039 * the tmps stack twice), then moving PL_tmps_floor above
1040 * them, then freeing the frame. That way, the only tmps that
1041 * accumulate over iterations are the return values for map.
1042 * We have to do to this way so that everything gets correctly
1043 * freed if we die during the map.
1047 /* make space for the slice */
1048 EXTEND_MORTAL(items);
1049 tmpsbase = PL_tmps_floor + 1;
1050 Move(PL_tmps_stack + tmpsbase,
1051 PL_tmps_stack + tmpsbase + items,
1052 PL_tmps_ix - PL_tmps_floor,
1054 PL_tmps_ix += items;
1059 sv = sv_mortalcopy(sv);
1061 PL_tmps_stack[tmpsbase++] = SvREFCNT_inc_simple(sv);
1063 /* clear the stack frame except for the items */
1064 PL_tmps_floor += items;
1066 /* FREETMPS may have cleared the TEMP flag on some of the items */
1069 SvTEMP_on(PL_tmps_stack[--tmpsbase]);
1072 /* scalar context: we don't care about which values map returns
1073 * (we use undef here). And so we certainly don't want to do mortal
1074 * copies of meaningless values. */
1075 while (items-- > 0) {
1077 *dst-- = &PL_sv_undef;
1085 LEAVE_with_name("grep_item"); /* exit inner scope */
1088 if (PL_markstack_ptr[-1] > TOPMARK) {
1090 (void)POPMARK; /* pop top */
1091 LEAVE_with_name("grep"); /* exit outer scope */
1092 (void)POPMARK; /* pop src */
1093 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
1094 (void)POPMARK; /* pop dst */
1095 SP = PL_stack_base + POPMARK; /* pop original mark */
1096 if (gimme == G_SCALAR) {
1100 else if (gimme == G_ARRAY)
1107 ENTER_with_name("grep_item"); /* enter inner scope */
1110 /* set $_ to the new source item */
1111 src = PL_stack_base[PL_markstack_ptr[-1]];
1112 if (SvPADTMP(src)) {
1113 src = sv_mortalcopy(src);
1118 RETURNOP(cLOGOP->op_other);
1127 if (GIMME_V == G_ARRAY)
1130 if (SvTRUE_NN(targ))
1131 return cLOGOP->op_other;
1140 if (GIMME_V == G_ARRAY) {
1141 RETURNOP(((LOGOP*)cUNOP->op_first)->op_other);
1145 SV * const targ = PAD_SV(PL_op->op_targ);
1148 if (PL_op->op_private & OPpFLIP_LINENUM) {
1149 if (GvIO(PL_last_in_gv)) {
1150 flip = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
1153 GV * const gv = gv_fetchpvs(".", GV_ADD|GV_NOTQUAL, SVt_PV);
1155 flip = SvIV(sv) == SvIV(GvSV(gv));
1158 flip = SvTRUE_NN(sv);
1161 sv_setiv(PAD_SV(cUNOP->op_first->op_targ), 1);
1162 if (PL_op->op_flags & OPf_SPECIAL) {
1170 RETURNOP(((LOGOP*)cUNOP->op_first)->op_other);
1179 /* This code tries to decide if "$left .. $right" should use the
1180 magical string increment, or if the range is numeric (we make
1181 an exception for .."0" [#18165]). AMS 20021031. */
1183 #define RANGE_IS_NUMERIC(left,right) ( \
1184 SvNIOKp(left) || (SvOK(left) && !SvPOKp(left)) || \
1185 SvNIOKp(right) || (SvOK(right) && !SvPOKp(right)) || \
1186 (((!SvOK(left) && SvOK(right)) || ((!SvOK(left) || \
1187 looks_like_number(left)) && SvPOKp(left) && *SvPVX_const(left) != '0')) \
1188 && (!SvOK(right) || looks_like_number(right))))
1194 if (GIMME_V == G_ARRAY) {
1200 if (RANGE_IS_NUMERIC(left,right)) {
1202 if ((SvOK(left) && !SvIOK(left) && SvNV_nomg(left) < IV_MIN) ||
1203 (SvOK(right) && (SvIOK(right)
1204 ? SvIsUV(right) && SvUV(right) > IV_MAX
1205 : SvNV_nomg(right) > IV_MAX)))
1206 DIE(aTHX_ "Range iterator outside integer range");
1207 i = SvIV_nomg(left);
1208 j = SvIV_nomg(right);
1210 /* Dance carefully around signed max. */
1211 bool overflow = (i <= 0 && j > SSize_t_MAX + i - 1);
1214 /* The wraparound of signed integers is undefined
1215 * behavior, but here we aim for count >=1, and
1216 * negative count is just wrong. */
1218 #if IVSIZE > Size_t_size
1225 Perl_croak(aTHX_ "Out of memory during list extend");
1232 SV * const sv = sv_2mortal(newSViv(i));
1234 if (n) /* avoid incrementing above IV_MAX */
1240 const char * const lpv = SvPV_nomg_const(left, llen);
1241 const char * const tmps = SvPV_nomg_const(right, len);
1243 SV *sv = newSVpvn_flags(lpv, llen, SvUTF8(left)|SVs_TEMP);
1244 if (DO_UTF8(right) && IN_UNI_8_BIT)
1245 len = sv_len_utf8_nomg(right);
1246 while (!SvNIOKp(sv) && SvCUR(sv) <= len) {
1248 if (strEQ(SvPVX_const(sv),tmps))
1250 sv = sv_2mortal(newSVsv(sv));
1257 SV * const targ = PAD_SV(cUNOP->op_first->op_targ);
1261 if (PL_op->op_private & OPpFLIP_LINENUM) {
1262 if (GvIO(PL_last_in_gv)) {
1263 flop = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
1266 GV * const gv = gv_fetchpvs(".", GV_ADD|GV_NOTQUAL, SVt_PV);
1267 if (gv && GvSV(gv)) flop = SvIV(sv) == SvIV(GvSV(gv));
1271 flop = SvTRUE_NN(sv);
1275 sv_setiv(PAD_SV(((UNOP*)cUNOP->op_first)->op_first->op_targ), 0);
1276 sv_catpvs(targ, "E0");
1286 static const char * const context_name[] = {
1288 NULL, /* CXt_WHEN never actually needs "block" */
1289 NULL, /* CXt_BLOCK never actually needs "block" */
1290 NULL, /* CXt_GIVEN never actually needs "block" */
1291 NULL, /* CXt_LOOP_PLAIN never actually needs "loop" */
1292 NULL, /* CXt_LOOP_LAZYIV never actually needs "loop" */
1293 NULL, /* CXt_LOOP_LAZYSV never actually needs "loop" */
1294 NULL, /* CXt_LOOP_LIST never actually needs "loop" */
1295 NULL, /* CXt_LOOP_ARY never actually needs "loop" */
1303 S_dopoptolabel(pTHX_ const char *label, STRLEN len, U32 flags)
1307 PERL_ARGS_ASSERT_DOPOPTOLABEL;
1309 for (i = cxstack_ix; i >= 0; i--) {
1310 const PERL_CONTEXT * const cx = &cxstack[i];
1311 switch (CxTYPE(cx)) {
1317 /* diag_listed_as: Exiting subroutine via %s */
1318 Perl_ck_warner(aTHX_ packWARN(WARN_EXITING), "Exiting %s via %s",
1319 context_name[CxTYPE(cx)], OP_NAME(PL_op));
1320 if (CxTYPE(cx) == CXt_NULL) /* sort BLOCK */
1323 case CXt_LOOP_PLAIN:
1324 case CXt_LOOP_LAZYIV:
1325 case CXt_LOOP_LAZYSV:
1329 STRLEN cx_label_len = 0;
1330 U32 cx_label_flags = 0;
1331 const char *cx_label = CxLABEL_len_flags(cx, &cx_label_len, &cx_label_flags);
1333 ( (cx_label_flags & SVf_UTF8) != (flags & SVf_UTF8) ) ?
1336 (const U8*)cx_label, cx_label_len,
1337 (const U8*)label, len) == 0)
1339 (const U8*)label, len,
1340 (const U8*)cx_label, cx_label_len) == 0)
1341 : (len == cx_label_len && ((cx_label == label)
1342 || memEQ(cx_label, label, len))) )) {
1343 DEBUG_l(Perl_deb(aTHX_ "(poptolabel(): skipping label at cx=%ld %s)\n",
1344 (long)i, cx_label));
1347 DEBUG_l( Perl_deb(aTHX_ "(poptolabel(): found label at cx=%ld %s)\n", (long)i, label));
1358 Perl_dowantarray(pTHX)
1360 const U8 gimme = block_gimme();
1361 return (gimme == G_VOID) ? G_SCALAR : gimme;
1365 Perl_block_gimme(pTHX)
1367 const I32 cxix = dopoptosub(cxstack_ix);
1372 gimme = (cxstack[cxix].blk_gimme & G_WANT);
1374 Perl_croak(aTHX_ "panic: bad gimme: %d\n", gimme);
1380 Perl_is_lvalue_sub(pTHX)
1382 const I32 cxix = dopoptosub(cxstack_ix);
1383 assert(cxix >= 0); /* We should only be called from inside subs */
1385 if (CxLVAL(cxstack + cxix) && CvLVALUE(cxstack[cxix].blk_sub.cv))
1386 return CxLVAL(cxstack + cxix);
1391 /* only used by cx_pushsub() */
1393 Perl_was_lvalue_sub(pTHX)
1395 const I32 cxix = dopoptosub(cxstack_ix-1);
1396 assert(cxix >= 0); /* We should only be called from inside subs */
1398 if (CxLVAL(cxstack + cxix) && CvLVALUE(cxstack[cxix].blk_sub.cv))
1399 return CxLVAL(cxstack + cxix);
1405 S_dopoptosub_at(pTHX_ const PERL_CONTEXT *cxstk, I32 startingblock)
1409 PERL_ARGS_ASSERT_DOPOPTOSUB_AT;
1411 PERL_UNUSED_CONTEXT;
1414 for (i = startingblock; i >= 0; i--) {
1415 const PERL_CONTEXT * const cx = &cxstk[i];
1416 switch (CxTYPE(cx)) {
1420 /* in sub foo { /(?{...})/ }, foo ends up on the CX stack
1421 * twice; the first for the normal foo() call, and the second
1422 * for a faked up re-entry into the sub to execute the
1423 * code block. Hide this faked entry from the world. */
1424 if (cx->cx_type & CXp_SUB_RE_FAKE)
1429 DEBUG_l( Perl_deb(aTHX_ "(dopoptosub_at(): found sub at cx=%ld)\n", (long)i));
1437 S_dopoptoeval(pTHX_ I32 startingblock)
1440 for (i = startingblock; i >= 0; i--) {
1441 const PERL_CONTEXT *cx = &cxstack[i];
1442 switch (CxTYPE(cx)) {
1446 DEBUG_l( Perl_deb(aTHX_ "(dopoptoeval(): found eval at cx=%ld)\n", (long)i));
1454 S_dopoptoloop(pTHX_ I32 startingblock)
1457 for (i = startingblock; i >= 0; i--) {
1458 const PERL_CONTEXT * const cx = &cxstack[i];
1459 switch (CxTYPE(cx)) {
1465 /* diag_listed_as: Exiting subroutine via %s */
1466 Perl_ck_warner(aTHX_ packWARN(WARN_EXITING), "Exiting %s via %s",
1467 context_name[CxTYPE(cx)], OP_NAME(PL_op));
1468 if ((CxTYPE(cx)) == CXt_NULL) /* sort BLOCK */
1471 case CXt_LOOP_PLAIN:
1472 case CXt_LOOP_LAZYIV:
1473 case CXt_LOOP_LAZYSV:
1476 DEBUG_l( Perl_deb(aTHX_ "(dopoptoloop(): found loop at cx=%ld)\n", (long)i));
1483 /* find the next GIVEN or FOR (with implicit $_) loop context block */
1486 S_dopoptogivenfor(pTHX_ I32 startingblock)
1489 for (i = startingblock; i >= 0; i--) {
1490 const PERL_CONTEXT *cx = &cxstack[i];
1491 switch (CxTYPE(cx)) {
1495 DEBUG_l( Perl_deb(aTHX_ "(dopoptogivenfor(): found given at cx=%ld)\n", (long)i));
1497 case CXt_LOOP_PLAIN:
1498 assert(!(cx->cx_type & CXp_FOR_DEF));
1500 case CXt_LOOP_LAZYIV:
1501 case CXt_LOOP_LAZYSV:
1504 if (cx->cx_type & CXp_FOR_DEF) {
1505 DEBUG_l( Perl_deb(aTHX_ "(dopoptogivenfor(): found foreach at cx=%ld)\n", (long)i));
1514 S_dopoptowhen(pTHX_ I32 startingblock)
1517 for (i = startingblock; i >= 0; i--) {
1518 const PERL_CONTEXT *cx = &cxstack[i];
1519 switch (CxTYPE(cx)) {
1523 DEBUG_l( Perl_deb(aTHX_ "(dopoptowhen(): found when at cx=%ld)\n", (long)i));
1530 /* dounwind(): pop all contexts above (but not including) cxix.
1531 * Note that it clears the savestack frame associated with each popped
1532 * context entry, but doesn't free any temps.
1533 * It does a cx_popblock() of the last frame that it pops, and leaves
1534 * cxstack_ix equal to cxix.
1538 Perl_dounwind(pTHX_ I32 cxix)
1540 if (!PL_curstackinfo) /* can happen if die during thread cloning */
1543 while (cxstack_ix > cxix) {
1544 PERL_CONTEXT *cx = CX_CUR();
1546 CX_DEBUG(cx, "UNWIND");
1547 /* Note: we don't need to restore the base context info till the end. */
1551 switch (CxTYPE(cx)) {
1554 /* CXt_SUBST is not a block context type, so skip the
1555 * cx_popblock(cx) below */
1556 if (cxstack_ix == cxix + 1) {
1567 case CXt_LOOP_PLAIN:
1568 case CXt_LOOP_LAZYIV:
1569 case CXt_LOOP_LAZYSV:
1582 /* these two don't have a POPFOO() */
1588 if (cxstack_ix == cxix + 1) {
1597 Perl_qerror(pTHX_ SV *err)
1599 PERL_ARGS_ASSERT_QERROR;
1602 if (PL_in_eval & EVAL_KEEPERR) {
1603 Perl_ck_warner(aTHX_ packWARN(WARN_MISC), "\t(in cleanup) %" SVf,
1607 sv_catsv(ERRSV, err);
1610 sv_catsv(PL_errors, err);
1612 Perl_warn(aTHX_ "%" SVf, SVfARG(err));
1614 ++PL_parser->error_count;
1619 /* pop a CXt_EVAL context and in addition, if it was a require then
1621 * 0: do nothing extra;
1622 * 1: undef $INC{$name}; croak "$name did not return a true value";
1623 * 2: delete $INC{$name}; croak "$errsv: Compilation failed in require"
1627 S_pop_eval_context_maybe_croak(pTHX_ PERL_CONTEXT *cx, SV *errsv, int action)
1629 SV *namesv = NULL; /* init to avoid dumb compiler warning */
1633 do_croak = action && (CxOLD_OP_TYPE(cx) == OP_REQUIRE);
1635 /* keep namesv alive after cx_popeval() */
1636 namesv = cx->blk_eval.old_namesv;
1637 cx->blk_eval.old_namesv = NULL;
1646 HV *inc_hv = GvHVn(PL_incgv);
1647 I32 klen = SvUTF8(namesv) ? -(I32)SvCUR(namesv) : (I32)SvCUR(namesv);
1648 const char *key = SvPVX_const(namesv);
1651 (void)hv_delete(inc_hv, key, klen, G_DISCARD);
1652 fmt = "%" SVf " did not return a true value";
1656 (void)hv_store(inc_hv, key, klen, &PL_sv_undef, 0);
1657 fmt = "%" SVf "Compilation failed in require";
1659 errsv = newSVpvs_flags("Unknown error\n", SVs_TEMP);
1662 Perl_croak(aTHX_ fmt, SVfARG(errsv));
1667 /* die_unwind(): this is the final destination for the various croak()
1668 * functions. If we're in an eval, unwind the context and other stacks
1669 * back to the top-most CXt_EVAL and set $@ to msv; otherwise print msv
1670 * to STDERR and initiate an exit. Note that if the CXt_EVAL popped back
1671 * to is a require the exception will be rethrown, as requires don't
1672 * actually trap exceptions.
1676 Perl_die_unwind(pTHX_ SV *msv)
1679 U8 in_eval = PL_in_eval;
1680 PERL_ARGS_ASSERT_DIE_UNWIND;
1685 /* We need to keep this SV alive through all the stack unwinding
1686 * and FREETMPSing below, while ensuing that it doesn't leak
1687 * if we call out to something which then dies (e.g. sub STORE{die}
1688 * when unlocalising a tied var). So we do a dance with
1689 * mortalising and SAVEFREEing.
1691 sv_2mortal(SvREFCNT_inc_simple_NN(exceptsv));
1694 * Historically, perl used to set ERRSV ($@) early in the die
1695 * process and rely on it not getting clobbered during unwinding.
1696 * That sucked, because it was liable to get clobbered, so the
1697 * setting of ERRSV used to emit the exception from eval{} has
1698 * been moved to much later, after unwinding (see just before
1699 * JMPENV_JUMP below). However, some modules were relying on the
1700 * early setting, by examining $@ during unwinding to use it as
1701 * a flag indicating whether the current unwinding was caused by
1702 * an exception. It was never a reliable flag for that purpose,
1703 * being totally open to false positives even without actual
1704 * clobberage, but was useful enough for production code to
1705 * semantically rely on it.
1707 * We'd like to have a proper introspective interface that
1708 * explicitly describes the reason for whatever unwinding
1709 * operations are currently in progress, so that those modules
1710 * work reliably and $@ isn't further overloaded. But we don't
1711 * have one yet. In its absence, as a stopgap measure, ERRSV is
1712 * now *additionally* set here, before unwinding, to serve as the
1713 * (unreliable) flag that it used to.
1715 * This behaviour is temporary, and should be removed when a
1716 * proper way to detect exceptional unwinding has been developed.
1717 * As of 2010-12, the authors of modules relying on the hack
1718 * are aware of the issue, because the modules failed on
1719 * perls 5.13.{1..7} which had late setting of $@ without this
1720 * early-setting hack.
1722 if (!(in_eval & EVAL_KEEPERR))
1723 sv_setsv_flags(ERRSV, exceptsv,
1724 (SV_GMAGIC|SV_DO_COW_SVSETSV|SV_NOSTEAL));
1726 if (in_eval & EVAL_KEEPERR) {
1727 Perl_ck_warner(aTHX_ packWARN(WARN_MISC), "\t(in cleanup) %" SVf,
1731 while ((cxix = dopoptoeval(cxstack_ix)) < 0
1732 && PL_curstackinfo->si_prev)
1742 JMPENV *restartjmpenv;
1745 if (cxix < cxstack_ix)
1749 assert(CxTYPE(cx) == CXt_EVAL);
1751 /* return false to the caller of eval */
1752 oldsp = PL_stack_base + cx->blk_oldsp;
1753 gimme = cx->blk_gimme;
1754 if (gimme == G_SCALAR)
1755 *++oldsp = &PL_sv_undef;
1756 PL_stack_sp = oldsp;
1758 restartjmpenv = cx->blk_eval.cur_top_env;
1759 restartop = cx->blk_eval.retop;
1761 /* We need a FREETMPS here to avoid late-called destructors
1762 * clobbering $@ *after* we set it below, e.g.
1763 * sub DESTROY { eval { die "X" } }
1764 * eval { my $x = bless []; die $x = 0, "Y" };
1766 * Here the clearing of the $x ref mortalises the anon array,
1767 * which needs to be freed *before* $& is set to "Y",
1768 * otherwise it gets overwritten with "X".
1770 * However, the FREETMPS will clobber exceptsv, so preserve it
1771 * on the savestack for now.
1773 SAVEFREESV(SvREFCNT_inc_simple_NN(exceptsv));
1775 /* now we're about to pop the savestack, so re-mortalise it */
1776 sv_2mortal(SvREFCNT_inc_simple_NN(exceptsv));
1778 /* Note that unlike pp_entereval, pp_require isn't supposed to
1779 * trap errors. So if we're a require, after we pop the
1780 * CXt_EVAL that pp_require pushed, rethrow the error with
1781 * croak(exceptsv). This is all handled by the call below when
1784 S_pop_eval_context_maybe_croak(aTHX_ cx, exceptsv, 2);
1786 if (!(in_eval & EVAL_KEEPERR))
1787 sv_setsv(ERRSV, exceptsv);
1788 PL_restartjmpenv = restartjmpenv;
1789 PL_restartop = restartop;
1791 NOT_REACHED; /* NOTREACHED */
1795 write_to_stderr(exceptsv);
1797 NOT_REACHED; /* NOTREACHED */
1803 if (SvTRUE_NN(left) != SvTRUE_NN(right))
1811 =head1 CV Manipulation Functions
1813 =for apidoc caller_cx
1815 The XSUB-writer's equivalent of L<caller()|perlfunc/caller>. The
1816 returned C<PERL_CONTEXT> structure can be interrogated to find all the
1817 information returned to Perl by C<caller>. Note that XSUBs don't get a
1818 stack frame, so C<caller_cx(0, NULL)> will return information for the
1819 immediately-surrounding Perl code.
1821 This function skips over the automatic calls to C<&DB::sub> made on the
1822 behalf of the debugger. If the stack frame requested was a sub called by
1823 C<DB::sub>, the return value will be the frame for the call to
1824 C<DB::sub>, since that has the correct line number/etc. for the call
1825 site. If I<dbcxp> is non-C<NULL>, it will be set to a pointer to the
1826 frame for the sub call itself.
1831 const PERL_CONTEXT *
1832 Perl_caller_cx(pTHX_ I32 count, const PERL_CONTEXT **dbcxp)
1834 I32 cxix = dopoptosub(cxstack_ix);
1835 const PERL_CONTEXT *cx;
1836 const PERL_CONTEXT *ccstack = cxstack;
1837 const PERL_SI *top_si = PL_curstackinfo;
1840 /* we may be in a higher stacklevel, so dig down deeper */
1841 while (cxix < 0 && top_si->si_type != PERLSI_MAIN) {
1842 top_si = top_si->si_prev;
1843 ccstack = top_si->si_cxstack;
1844 cxix = dopoptosub_at(ccstack, top_si->si_cxix);
1848 /* caller() should not report the automatic calls to &DB::sub */
1849 if (PL_DBsub && GvCV(PL_DBsub) && cxix >= 0 &&
1850 ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))
1854 cxix = dopoptosub_at(ccstack, cxix - 1);
1857 cx = &ccstack[cxix];
1858 if (dbcxp) *dbcxp = cx;
1860 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
1861 const I32 dbcxix = dopoptosub_at(ccstack, cxix - 1);
1862 /* We expect that ccstack[dbcxix] is CXt_SUB, anyway, the
1863 field below is defined for any cx. */
1864 /* caller() should not report the automatic calls to &DB::sub */
1865 if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub))
1866 cx = &ccstack[dbcxix];
1875 const PERL_CONTEXT *cx;
1876 const PERL_CONTEXT *dbcx;
1878 const HEK *stash_hek;
1880 bool has_arg = MAXARG && TOPs;
1889 cx = caller_cx(count + !!(PL_op->op_private & OPpOFFBYONE), &dbcx);
1891 if (gimme != G_ARRAY) {
1898 CX_DEBUG(cx, "CALLER");
1899 assert(CopSTASH(cx->blk_oldcop));
1900 stash_hek = SvTYPE(CopSTASH(cx->blk_oldcop)) == SVt_PVHV
1901 ? HvNAME_HEK((HV*)CopSTASH(cx->blk_oldcop))
1903 if (gimme != G_ARRAY) {
1906 PUSHs(&PL_sv_undef);
1909 sv_sethek(TARG, stash_hek);
1918 PUSHs(&PL_sv_undef);
1921 sv_sethek(TARG, stash_hek);
1924 mPUSHs(newSVpv(OutCopFILE(cx->blk_oldcop), 0));
1925 lcop = closest_cop(cx->blk_oldcop, OpSIBLING(cx->blk_oldcop),
1926 cx->blk_sub.retop, TRUE);
1928 lcop = cx->blk_oldcop;
1929 mPUSHu(CopLINE(lcop));
1932 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
1933 /* So is ccstack[dbcxix]. */
1934 if (CvHASGV(dbcx->blk_sub.cv)) {
1935 PUSHs(cv_name(dbcx->blk_sub.cv, 0, 0));
1936 PUSHs(boolSV(CxHASARGS(cx)));
1939 PUSHs(newSVpvs_flags("(unknown)", SVs_TEMP));
1940 PUSHs(boolSV(CxHASARGS(cx)));
1944 PUSHs(newSVpvs_flags("(eval)", SVs_TEMP));
1947 gimme = cx->blk_gimme;
1948 if (gimme == G_VOID)
1949 PUSHs(&PL_sv_undef);
1951 PUSHs(boolSV((gimme & G_WANT) == G_ARRAY));
1952 if (CxTYPE(cx) == CXt_EVAL) {
1954 if (CxOLD_OP_TYPE(cx) == OP_ENTEREVAL) {
1955 SV *cur_text = cx->blk_eval.cur_text;
1956 if (SvCUR(cur_text) >= 2) {
1957 PUSHs(newSVpvn_flags(SvPVX(cur_text), SvCUR(cur_text)-2,
1958 SvUTF8(cur_text)|SVs_TEMP));
1961 /* I think this is will always be "", but be sure */
1962 PUSHs(sv_2mortal(newSVsv(cur_text)));
1968 else if (cx->blk_eval.old_namesv) {
1969 mPUSHs(newSVsv(cx->blk_eval.old_namesv));
1972 /* eval BLOCK (try blocks have old_namesv == 0) */
1974 PUSHs(&PL_sv_undef);
1975 PUSHs(&PL_sv_undef);
1979 PUSHs(&PL_sv_undef);
1980 PUSHs(&PL_sv_undef);
1982 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)
1983 && CopSTASH_eq(PL_curcop, PL_debstash))
1985 /* slot 0 of the pad contains the original @_ */
1986 AV * const ary = MUTABLE_AV(AvARRAY(MUTABLE_AV(
1987 PadlistARRAY(CvPADLIST(cx->blk_sub.cv))[
1988 cx->blk_sub.olddepth+1]))[0]);
1989 const SSize_t off = AvARRAY(ary) - AvALLOC(ary);
1991 Perl_init_dbargs(aTHX);
1993 if (AvMAX(PL_dbargs) < AvFILLp(ary) + off)
1994 av_extend(PL_dbargs, AvFILLp(ary) + off);
1995 if (AvFILLp(ary) + 1 + off)
1996 Copy(AvALLOC(ary), AvARRAY(PL_dbargs), AvFILLp(ary) + 1 + off, SV*);
1997 AvFILLp(PL_dbargs) = AvFILLp(ary) + off;
1999 mPUSHi(CopHINTS_get(cx->blk_oldcop));
2002 STRLEN * const old_warnings = cx->blk_oldcop->cop_warnings ;
2004 if (old_warnings == pWARN_NONE)
2005 mask = newSVpvn(WARN_NONEstring, WARNsize) ;
2006 else if (old_warnings == pWARN_STD && (PL_dowarn & G_WARN_ON) == 0)
2007 mask = &PL_sv_undef ;
2008 else if (old_warnings == pWARN_ALL ||
2009 (old_warnings == pWARN_STD && PL_dowarn & G_WARN_ON)) {
2010 mask = newSVpvn(WARN_ALLstring, WARNsize) ;
2013 mask = newSVpvn((char *) (old_warnings + 1), old_warnings[0]);
2017 PUSHs(cx->blk_oldcop->cop_hints_hash ?
2018 sv_2mortal(newRV_noinc(MUTABLE_SV(cop_hints_2hv(cx->blk_oldcop, 0))))
2028 if (MAXARG < 1 || (!TOPs && !POPs)) {
2030 tmps = NULL, len = 0;
2033 tmps = SvPVx_const(POPs, len);
2034 sv_resetpvn(tmps, len, CopSTASH(PL_curcop));
2039 /* like pp_nextstate, but used instead when the debugger is active */
2043 PL_curcop = (COP*)PL_op;
2044 TAINT_NOT; /* Each statement is presumed innocent */
2045 PL_stack_sp = PL_stack_base + CX_CUR()->blk_oldsp;
2050 if (PL_op->op_flags & OPf_SPECIAL /* breakpoint */
2051 || PL_DBsingle_iv || PL_DBsignal_iv || PL_DBtrace_iv)
2055 const U8 gimme = G_ARRAY;
2056 GV * const gv = PL_DBgv;
2059 if (gv && isGV_with_GP(gv))
2062 if (!cv || (!CvROOT(cv) && !CvXSUB(cv)))
2063 DIE(aTHX_ "No DB::DB routine defined");
2065 if (CvDEPTH(cv) >= 1 && !(PL_debug & DEBUG_DB_RECURSE_FLAG))
2066 /* don't do recursive DB::DB call */
2076 (void)(*CvXSUB(cv))(aTHX_ cv);
2082 cx = cx_pushblock(CXt_SUB, gimme, SP, PL_savestack_ix);
2083 cx_pushsub(cx, cv, PL_op->op_next, 0);
2084 /* OP_DBSTATE's op_private holds hint bits rather than
2085 * the lvalue-ish flags seen in OP_ENTERSUB. So cancel
2086 * any CxLVAL() flags that have now been mis-calculated */
2093 if (CvDEPTH(cv) >= 2)
2094 pad_push(CvPADLIST(cv), CvDEPTH(cv));
2095 PAD_SET_CUR_NOSAVE(CvPADLIST(cv), CvDEPTH(cv));
2096 RETURNOP(CvSTART(cv));
2108 (void)cx_pushblock(CXt_BLOCK, gimme, PL_stack_sp, PL_savestack_ix);
2120 assert(CxTYPE(cx) == CXt_BLOCK);
2122 if (PL_op->op_flags & OPf_SPECIAL)
2123 /* fake block should preserve $1 et al; e.g. /(...)/ while ...; */
2124 cx->blk_oldpm = PL_curpm;
2126 oldsp = PL_stack_base + cx->blk_oldsp;
2127 gimme = cx->blk_gimme;
2129 if (gimme == G_VOID)
2130 PL_stack_sp = oldsp;
2132 leave_adjust_stacks(oldsp, oldsp, gimme,
2133 PL_op->op_private & OPpLVALUE ? 3 : 1);
2143 S_outside_integer(pTHX_ SV *sv)
2146 const NV nv = SvNV_nomg(sv);
2147 if (Perl_isinfnan(nv))
2149 #ifdef NV_PRESERVES_UV
2150 if (nv < (NV)IV_MIN || nv > (NV)IV_MAX)
2153 if (nv <= (NV)IV_MIN)
2156 ((nv > (NV)UV_MAX ||
2157 SvUV_nomg(sv) > (UV)IV_MAX)))
2168 const U8 gimme = GIMME_V;
2169 void *itervarp; /* GV or pad slot of the iteration variable */
2170 SV *itersave; /* the old var in the iterator var slot */
2173 if (PL_op->op_targ) { /* "my" variable */
2174 itervarp = &PAD_SVl(PL_op->op_targ);
2175 itersave = *(SV**)itervarp;
2177 if (PL_op->op_private & OPpLVAL_INTRO) { /* for my $x (...) */
2178 /* the SV currently in the pad slot is never live during
2179 * iteration (the slot is always aliased to one of the items)
2180 * so it's always stale */
2181 SvPADSTALE_on(itersave);
2183 SvREFCNT_inc_simple_void_NN(itersave);
2184 cxflags = CXp_FOR_PAD;
2187 SV * const sv = POPs;
2188 itervarp = (void *)sv;
2189 if (LIKELY(isGV(sv))) { /* symbol table variable */
2190 itersave = GvSV(sv);
2191 SvREFCNT_inc_simple_void(itersave);
2192 cxflags = CXp_FOR_GV;
2193 if (PL_op->op_private & OPpITER_DEF)
2194 cxflags |= CXp_FOR_DEF;
2196 else { /* LV ref: for \$foo (...) */
2197 assert(SvTYPE(sv) == SVt_PVMG);
2198 assert(SvMAGIC(sv));
2199 assert(SvMAGIC(sv)->mg_type == PERL_MAGIC_lvref);
2201 cxflags = CXp_FOR_LVREF;
2204 /* OPpITER_DEF (implicit $_) should only occur with a GV iter var */
2205 assert((cxflags & CXp_FOR_GV) || !(PL_op->op_private & OPpITER_DEF));
2207 /* Note that this context is initially set as CXt_NULL. Further on
2208 * down it's changed to one of the CXt_LOOP_*. Before it's changed,
2209 * there mustn't be anything in the blk_loop substruct that requires
2210 * freeing or undoing, in case we die in the meantime. And vice-versa.
2212 cx = cx_pushblock(cxflags, gimme, MARK, PL_savestack_ix);
2213 cx_pushloop_for(cx, itervarp, itersave);
2215 if (PL_op->op_flags & OPf_STACKED) {
2216 /* OPf_STACKED implies either a single array: for(@), with a
2217 * single AV on the stack, or a range: for (1..5), with 1 and 5 on
2219 SV *maybe_ary = POPs;
2220 if (SvTYPE(maybe_ary) != SVt_PVAV) {
2223 SV * const right = maybe_ary;
2224 if (UNLIKELY(cxflags & CXp_FOR_LVREF))
2225 DIE(aTHX_ "Assigned value is not a reference");
2228 if (RANGE_IS_NUMERIC(sv,right)) {
2229 cx->cx_type |= CXt_LOOP_LAZYIV;
2230 if (S_outside_integer(aTHX_ sv) ||
2231 S_outside_integer(aTHX_ right))
2232 DIE(aTHX_ "Range iterator outside integer range");
2233 cx->blk_loop.state_u.lazyiv.cur = SvIV_nomg(sv);
2234 cx->blk_loop.state_u.lazyiv.end = SvIV_nomg(right);
2237 cx->cx_type |= CXt_LOOP_LAZYSV;
2238 cx->blk_loop.state_u.lazysv.cur = newSVsv(sv);
2239 cx->blk_loop.state_u.lazysv.end = right;
2240 SvREFCNT_inc_simple_void_NN(right);
2241 (void) SvPV_force_nolen(cx->blk_loop.state_u.lazysv.cur);
2242 /* This will do the upgrade to SVt_PV, and warn if the value
2243 is uninitialised. */
2244 (void) SvPV_nolen_const(right);
2245 /* Doing this avoids a check every time in pp_iter in pp_hot.c
2246 to replace !SvOK() with a pointer to "". */
2248 SvREFCNT_dec(right);
2249 cx->blk_loop.state_u.lazysv.end = &PL_sv_no;
2253 else /* SvTYPE(maybe_ary) == SVt_PVAV */ {
2254 /* for (@array) {} */
2255 cx->cx_type |= CXt_LOOP_ARY;
2256 cx->blk_loop.state_u.ary.ary = MUTABLE_AV(maybe_ary);
2257 SvREFCNT_inc_simple_void_NN(maybe_ary);
2258 cx->blk_loop.state_u.ary.ix =
2259 (PL_op->op_private & OPpITER_REVERSED) ?
2260 AvFILL(cx->blk_loop.state_u.ary.ary) + 1 :
2263 /* EXTEND(SP, 1) not needed in this branch because we just did POPs */
2265 else { /* iterating over items on the stack */
2266 cx->cx_type |= CXt_LOOP_LIST;
2267 cx->blk_oldsp = SP - PL_stack_base;
2268 cx->blk_loop.state_u.stack.basesp = MARK - PL_stack_base;
2269 cx->blk_loop.state_u.stack.ix =
2270 (PL_op->op_private & OPpITER_REVERSED)
2272 : cx->blk_loop.state_u.stack.basesp;
2273 /* pre-extend stack so pp_iter doesn't have to check every time
2274 * it pushes yes/no */
2284 const U8 gimme = GIMME_V;
2286 cx = cx_pushblock(CXt_LOOP_PLAIN, gimme, PL_stack_sp, PL_savestack_ix);
2287 cx_pushloop_plain(cx);
2300 assert(CxTYPE_is_LOOP(cx));
2301 oldsp = PL_stack_base + cx->blk_oldsp;
2302 base = CxTYPE(cx) == CXt_LOOP_LIST
2303 ? PL_stack_base + cx->blk_loop.state_u.stack.basesp
2305 gimme = cx->blk_gimme;
2307 if (gimme == G_VOID)
2310 leave_adjust_stacks(oldsp, base, gimme,
2311 PL_op->op_private & OPpLVALUE ? 3 : 1);
2314 cx_poploop(cx); /* Stack values are safe: release loop vars ... */
2322 /* This duplicates most of pp_leavesub, but with additional code to handle
2323 * return args in lvalue context. It was forked from pp_leavesub to
2324 * avoid slowing down that function any further.
2326 * Any changes made to this function may need to be copied to pp_leavesub
2329 * also tail-called by pp_return
2340 assert(CxTYPE(cx) == CXt_SUB);
2342 if (CxMULTICALL(cx)) {
2343 /* entry zero of a stack is always PL_sv_undef, which
2344 * simplifies converting a '()' return into undef in scalar context */
2345 assert(PL_stack_sp > PL_stack_base || *PL_stack_base == &PL_sv_undef);
2349 gimme = cx->blk_gimme;
2350 oldsp = PL_stack_base + cx->blk_oldsp; /* last arg of previous frame */
2352 if (gimme == G_VOID)
2353 PL_stack_sp = oldsp;
2355 U8 lval = CxLVAL(cx);
2356 bool is_lval = (lval && !(lval & OPpENTERSUB_INARGS));
2357 const char *what = NULL;
2359 if (gimme == G_SCALAR) {
2361 /* check for bad return arg */
2362 if (oldsp < PL_stack_sp) {
2363 SV *sv = *PL_stack_sp;
2364 if ((SvPADTMP(sv) || SvREADONLY(sv))) {
2366 SvREADONLY(sv) ? (sv == &PL_sv_undef) ? "undef"
2367 : "a readonly value" : "a temporary";
2372 /* sub:lvalue{} will take us here. */
2377 "Can't return %s from lvalue subroutine", what);
2381 leave_adjust_stacks(oldsp, oldsp, gimme, is_lval ? 3 : 2);
2383 if (lval & OPpDEREF) {
2384 /* lval_sub()->{...} and similar */
2388 TOPs = vivify_ref(TOPs, CxLVAL(cx) & OPpDEREF);
2394 assert(gimme == G_ARRAY);
2395 assert (!(lval & OPpDEREF));
2398 /* scan for bad return args */
2400 for (p = PL_stack_sp; p > oldsp; p--) {
2402 /* the PL_sv_undef exception is to allow things like
2403 * this to work, where PL_sv_undef acts as 'skip'
2404 * placeholder on the LHS of list assigns:
2405 * sub foo :lvalue { undef }
2406 * ($a, undef, foo(), $b) = 1..4;
2408 if (sv != &PL_sv_undef && (SvPADTMP(sv) || SvREADONLY(sv)))
2410 /* Might be flattened array after $#array = */
2411 what = SvREADONLY(sv)
2412 ? "a readonly value" : "a temporary";
2418 leave_adjust_stacks(oldsp, oldsp, gimme, is_lval ? 3 : 2);
2423 cx_popsub(cx); /* Stack values are safe: release CV and @_ ... */
2425 retop = cx->blk_sub.retop;
2436 const I32 cxix = dopoptosub(cxstack_ix);
2438 assert(cxstack_ix >= 0);
2439 if (cxix < cxstack_ix) {
2441 if (!( PL_curstackinfo->si_type == PERLSI_SORT
2442 || ( PL_curstackinfo->si_type == PERLSI_MULTICALL
2443 && (cxstack[0].cx_type & CXp_SUB_RE_FAKE))
2446 DIE(aTHX_ "Can't return outside a subroutine");
2448 * a sort block, which is a CXt_NULL not a CXt_SUB;
2449 * or a /(?{...})/ block.
2450 * Handle specially. */
2451 assert(CxTYPE(&cxstack[0]) == CXt_NULL
2452 || ( CxTYPE(&cxstack[0]) == CXt_SUB
2453 && (cxstack[0].cx_type & CXp_SUB_RE_FAKE)));
2454 if (cxstack_ix > 0) {
2455 /* See comment below about context popping. Since we know
2456 * we're scalar and not lvalue, we can preserve the return
2457 * value in a simpler fashion than there. */
2459 assert(cxstack[0].blk_gimme == G_SCALAR);
2460 if ( (sp != PL_stack_base)
2461 && !(SvFLAGS(sv) & (SVs_TEMP|SVs_PADTMP))
2463 *SP = sv_mortalcopy(sv);
2466 /* caller responsible for popping cxstack[0] */
2470 /* There are contexts that need popping. Doing this may free the
2471 * return value(s), so preserve them first: e.g. popping the plain
2472 * loop here would free $x:
2473 * sub f { { my $x = 1; return $x } }
2474 * We may also need to shift the args down; for example,
2475 * for (1,2) { return 3,4 }
2476 * leaves 1,2,3,4 on the stack. Both these actions will be done by
2477 * leave_adjust_stacks(), along with freeing any temps. Note that
2478 * whoever we tail-call (e.g. pp_leaveeval) will also call
2479 * leave_adjust_stacks(); however, the second call is likely to
2480 * just see a bunch of SvTEMPs with a ref count of 1, and so just
2481 * pass them through, rather than copying them again. So this
2482 * isn't as inefficient as it sounds.
2484 cx = &cxstack[cxix];
2486 if (cx->blk_gimme != G_VOID)
2487 leave_adjust_stacks(MARK, PL_stack_base + cx->blk_oldsp,
2489 CxTYPE(cx) == CXt_SUB && CvLVALUE(cx->blk_sub.cv)
2493 cx = &cxstack[cxix]; /* CX stack may have been realloced */
2496 /* Like in the branch above, we need to handle any extra junk on
2497 * the stack. But because we're not also popping extra contexts, we
2498 * don't have to worry about prematurely freeing args. So we just
2499 * need to do the bare minimum to handle junk, and leave the main
2500 * arg processing in the function we tail call, e.g. pp_leavesub.
2501 * In list context we have to splice out the junk; in scalar
2502 * context we can leave as-is (pp_leavesub will later return the
2503 * top stack element). But for an empty arg list, e.g.
2504 * for (1,2) { return }
2505 * we need to set sp = oldsp so that pp_leavesub knows to push
2506 * &PL_sv_undef onto the stack.
2509 cx = &cxstack[cxix];
2510 oldsp = PL_stack_base + cx->blk_oldsp;
2511 if (oldsp != MARK) {
2512 SSize_t nargs = SP - MARK;
2514 if (cx->blk_gimme == G_ARRAY) {
2515 /* shift return args to base of call stack frame */
2516 Move(MARK + 1, oldsp + 1, nargs, SV*);
2517 PL_stack_sp = oldsp + nargs;
2521 PL_stack_sp = oldsp;
2525 /* fall through to a normal exit */
2526 switch (CxTYPE(cx)) {
2528 return CxTRYBLOCK(cx)
2529 ? Perl_pp_leavetry(aTHX)
2530 : Perl_pp_leaveeval(aTHX);
2532 return CvLVALUE(cx->blk_sub.cv)
2533 ? Perl_pp_leavesublv(aTHX)
2534 : Perl_pp_leavesub(aTHX);
2536 return Perl_pp_leavewrite(aTHX);
2538 DIE(aTHX_ "panic: return, type=%u", (unsigned) CxTYPE(cx));
2542 /* find the enclosing loop or labelled loop and dounwind() back to it. */
2544 static PERL_CONTEXT *
2548 if (PL_op->op_flags & OPf_SPECIAL) {
2549 cxix = dopoptoloop(cxstack_ix);
2551 /* diag_listed_as: Can't "last" outside a loop block */
2552 Perl_croak(aTHX_ "Can't \"%s\" outside a loop block",
2558 const char * const label =
2559 PL_op->op_flags & OPf_STACKED
2560 ? SvPV(TOPs,label_len)
2561 : (label_len = strlen(cPVOP->op_pv), cPVOP->op_pv);
2562 const U32 label_flags =
2563 PL_op->op_flags & OPf_STACKED
2565 : (cPVOP->op_private & OPpPV_IS_UTF8) ? SVf_UTF8 : 0;
2567 cxix = dopoptolabel(label, label_len, label_flags);
2569 /* diag_listed_as: Label not found for "last %s" */
2570 Perl_croak(aTHX_ "Label not found for \"%s %" SVf "\"",
2572 SVfARG(PL_op->op_flags & OPf_STACKED
2573 && !SvGMAGICAL(TOPp1s)
2575 : newSVpvn_flags(label,
2577 label_flags | SVs_TEMP)));
2579 if (cxix < cxstack_ix)
2581 return &cxstack[cxix];
2590 cx = S_unwind_loop(aTHX);
2592 assert(CxTYPE_is_LOOP(cx));
2593 PL_stack_sp = PL_stack_base
2594 + (CxTYPE(cx) == CXt_LOOP_LIST
2595 ? cx->blk_loop.state_u.stack.basesp
2601 /* Stack values are safe: */
2603 cx_poploop(cx); /* release loop vars ... */
2605 nextop = cx->blk_loop.my_op->op_lastop->op_next;
2615 /* if not a bare 'next' in the main scope, search for it */
2617 if (!((PL_op->op_flags & OPf_SPECIAL) && CxTYPE_is_LOOP(cx)))
2618 cx = S_unwind_loop(aTHX);
2621 PL_curcop = cx->blk_oldcop;
2623 return (cx)->blk_loop.my_op->op_nextop;
2628 PERL_CONTEXT *cx = S_unwind_loop(aTHX);
2629 OP* redo_op = cx->blk_loop.my_op->op_redoop;
2631 if (redo_op->op_type == OP_ENTER) {
2632 /* pop one less context to avoid $x being freed in while (my $x..) */
2635 assert(CxTYPE(cx) == CXt_BLOCK);
2636 redo_op = redo_op->op_next;
2642 PL_curcop = cx->blk_oldcop;
2648 S_dofindlabel(pTHX_ OP *o, const char *label, STRLEN len, U32 flags, OP **opstack, OP **oplimit)
2651 static const char* const too_deep = "Target of goto is too deeply nested";
2653 PERL_ARGS_ASSERT_DOFINDLABEL;
2656 Perl_croak(aTHX_ "%s", too_deep);
2657 if (o->op_type == OP_LEAVE ||
2658 o->op_type == OP_SCOPE ||
2659 o->op_type == OP_LEAVELOOP ||
2660 o->op_type == OP_LEAVESUB ||
2661 o->op_type == OP_LEAVETRY)
2663 *ops++ = cUNOPo->op_first;
2665 Perl_croak(aTHX_ "%s", too_deep);
2668 if (o->op_flags & OPf_KIDS) {
2670 /* First try all the kids at this level, since that's likeliest. */
2671 for (kid = cUNOPo->op_first; kid; kid = OpSIBLING(kid)) {
2672 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) {
2673 STRLEN kid_label_len;
2674 U32 kid_label_flags;
2675 const char *kid_label = CopLABEL_len_flags(kCOP,
2676 &kid_label_len, &kid_label_flags);
2678 ( (kid_label_flags & SVf_UTF8) != (flags & SVf_UTF8) ) ?
2681 (const U8*)kid_label, kid_label_len,
2682 (const U8*)label, len) == 0)
2684 (const U8*)label, len,
2685 (const U8*)kid_label, kid_label_len) == 0)
2686 : ( len == kid_label_len && ((kid_label == label)
2687 || memEQ(kid_label, label, len)))))
2691 for (kid = cUNOPo->op_first; kid; kid = OpSIBLING(kid)) {
2692 if (kid == PL_lastgotoprobe)
2694 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) {
2697 else if (ops[-1]->op_type == OP_NEXTSTATE ||
2698 ops[-1]->op_type == OP_DBSTATE)
2703 if ((o = dofindlabel(kid, label, len, flags, ops, oplimit)))
2712 /* also used for: pp_dump() */
2720 #define GOTO_DEPTH 64
2721 OP *enterops[GOTO_DEPTH];
2722 const char *label = NULL;
2723 STRLEN label_len = 0;
2724 U32 label_flags = 0;
2725 const bool do_dump = (PL_op->op_type == OP_DUMP);
2726 static const char* const must_have_label = "goto must have label";
2728 if (PL_op->op_flags & OPf_STACKED) {
2729 /* goto EXPR or goto &foo */
2731 SV * const sv = POPs;
2734 if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVCV) {
2735 /* This egregious kludge implements goto &subroutine */
2738 CV *cv = MUTABLE_CV(SvRV(sv));
2739 AV *arg = GvAV(PL_defgv);
2741 while (!CvROOT(cv) && !CvXSUB(cv)) {
2742 const GV * const gv = CvGV(cv);
2746 /* autoloaded stub? */
2747 if (cv != GvCV(gv) && (cv = GvCV(gv)))
2749 autogv = gv_autoload_pvn(GvSTASH(gv), GvNAME(gv),
2751 GvNAMEUTF8(gv) ? SVf_UTF8 : 0);
2752 if (autogv && (cv = GvCV(autogv)))
2754 tmpstr = sv_newmortal();
2755 gv_efullname3(tmpstr, gv, NULL);
2756 DIE(aTHX_ "Goto undefined subroutine &%" SVf, SVfARG(tmpstr));
2758 DIE(aTHX_ "Goto undefined subroutine");
2761 cxix = dopoptosub(cxstack_ix);
2763 DIE(aTHX_ "Can't goto subroutine outside a subroutine");
2765 cx = &cxstack[cxix];
2766 /* ban goto in eval: see <20050521150056.GC20213@iabyn.com> */
2767 if (CxTYPE(cx) == CXt_EVAL) {
2769 /* diag_listed_as: Can't goto subroutine from an eval-%s */
2770 DIE(aTHX_ "Can't goto subroutine from an eval-string");
2772 /* diag_listed_as: Can't goto subroutine from an eval-%s */
2773 DIE(aTHX_ "Can't goto subroutine from an eval-block");
2775 else if (CxMULTICALL(cx))
2776 DIE(aTHX_ "Can't goto subroutine from a sort sub (or similar callback)");
2778 /* First do some returnish stuff. */
2780 SvREFCNT_inc_simple_void(cv); /* avoid premature free during unwind */
2782 if (cxix < cxstack_ix) {
2789 /* protect @_ during save stack unwind. */
2791 SvREFCNT_inc_NN(sv_2mortal(MUTABLE_SV(arg)));
2793 assert(PL_scopestack_ix == cx->blk_oldscopesp);
2796 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)) {
2797 /* this is part of cx_popsub_args() */
2798 AV* av = MUTABLE_AV(PAD_SVl(0));
2799 assert(AvARRAY(MUTABLE_AV(
2800 PadlistARRAY(CvPADLIST(cx->blk_sub.cv))[
2801 CvDEPTH(cx->blk_sub.cv)])) == PL_curpad);
2803 /* we are going to donate the current @_ from the old sub
2804 * to the new sub. This first part of the donation puts a
2805 * new empty AV in the pad[0] slot of the old sub,
2806 * unless pad[0] and @_ differ (e.g. if the old sub did
2807 * local *_ = []); in which case clear the old pad[0]
2808 * array in the usual way */
2809 if (av == arg || AvREAL(av))
2810 clear_defarray(av, av == arg);
2811 else CLEAR_ARGARRAY(av);
2814 /* don't restore PL_comppad here. It won't be needed if the
2815 * sub we're going to is non-XS, but restoring it early then
2816 * croaking (e.g. the "Goto undefined subroutine" below)
2817 * means the CX block gets processed again in dounwind,
2818 * but this time with the wrong PL_comppad */
2820 /* A destructor called during LEAVE_SCOPE could have undefined
2821 * our precious cv. See bug #99850. */
2822 if (!CvROOT(cv) && !CvXSUB(cv)) {
2823 const GV * const gv = CvGV(cv);
2825 SV * const tmpstr = sv_newmortal();
2826 gv_efullname3(tmpstr, gv, NULL);
2827 DIE(aTHX_ "Goto undefined subroutine &%" SVf,
2830 DIE(aTHX_ "Goto undefined subroutine");
2833 if (CxTYPE(cx) == CXt_SUB) {
2834 CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth;
2835 SvREFCNT_dec_NN(cx->blk_sub.cv);
2838 /* Now do some callish stuff. */
2840 const SSize_t items = arg ? AvFILL(arg) + 1 : 0;
2841 const bool m = arg ? cBOOL(SvRMAGICAL(arg)) : 0;
2846 SAVEFREESV(cv); /* later, undo the 'avoid premature free' hack */
2848 /* put GvAV(defgv) back onto stack */
2850 EXTEND(SP, items+1); /* @_ could have been extended. */
2855 bool r = cBOOL(AvREAL(arg));
2856 for (index=0; index<items; index++)
2860 SV ** const svp = av_fetch(arg, index, 0);
2861 sv = svp ? *svp : NULL;
2863 else sv = AvARRAY(arg)[index];
2865 ? r ? SvREFCNT_inc_NN(sv_2mortal(sv)) : sv
2866 : sv_2mortal(newSVavdefelem(arg, index, 1));
2870 if (CxTYPE(cx) == CXt_SUB && CxHASARGS(cx)) {
2871 /* Restore old @_ */
2872 CX_POP_SAVEARRAY(cx);
2875 retop = cx->blk_sub.retop;
2876 PL_comppad = cx->blk_sub.prevcomppad;
2877 PL_curpad = LIKELY(PL_comppad) ? AvARRAY(PL_comppad) : NULL;
2879 /* XS subs don't have a CXt_SUB, so pop it;
2880 * this is a cx_popblock(), less all the stuff we already did
2881 * for cx_topblock() earlier */
2882 PL_curcop = cx->blk_oldcop;
2885 /* Push a mark for the start of arglist */
2888 (void)(*CvXSUB(cv))(aTHX_ cv);
2893 PADLIST * const padlist = CvPADLIST(cv);
2895 SAVEFREESV(cv); /* later, undo the 'avoid premature free' hack */
2897 /* partial unrolled cx_pushsub(): */
2899 cx->blk_sub.cv = cv;
2900 cx->blk_sub.olddepth = CvDEPTH(cv);
2903 SvREFCNT_inc_simple_void_NN(cv);
2904 if (CvDEPTH(cv) > 1) {
2905 if (CvDEPTH(cv) == PERL_SUB_DEPTH_WARN && ckWARN(WARN_RECURSION))
2906 sub_crush_depth(cv);
2907 pad_push(padlist, CvDEPTH(cv));
2909 PL_curcop = cx->blk_oldcop;
2910 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
2913 /* second half of donating @_ from the old sub to the
2914 * new sub: abandon the original pad[0] AV in the
2915 * new sub, and replace it with the donated @_.
2916 * pad[0] takes ownership of the extra refcount
2917 * we gave arg earlier */
2919 SvREFCNT_dec(PAD_SVl(0));
2920 PAD_SVl(0) = (SV *)arg;
2921 SvREFCNT_inc_simple_void_NN(arg);
2924 /* GvAV(PL_defgv) might have been modified on scope
2925 exit, so point it at arg again. */
2926 if (arg != GvAV(PL_defgv)) {
2927 AV * const av = GvAV(PL_defgv);
2928 GvAV(PL_defgv) = (AV *)SvREFCNT_inc_simple(arg);
2933 if (PERLDB_SUB) { /* Checking curstash breaks DProf. */
2934 Perl_get_db_sub(aTHX_ NULL, cv);
2936 CV * const gotocv = get_cvs("DB::goto", 0);
2938 PUSHMARK( PL_stack_sp );
2939 call_sv(MUTABLE_SV(gotocv), G_SCALAR | G_NODEBUG);
2944 retop = CvSTART(cv);
2945 goto putback_return;
2950 label = SvPV_nomg_const(sv, label_len);
2951 label_flags = SvUTF8(sv);
2954 else if (!(PL_op->op_flags & OPf_SPECIAL)) {
2955 /* goto LABEL or dump LABEL */
2956 label = cPVOP->op_pv;
2957 label_flags = (cPVOP->op_private & OPpPV_IS_UTF8) ? SVf_UTF8 : 0;
2958 label_len = strlen(label);
2960 if (!(do_dump || label_len)) DIE(aTHX_ "%s", must_have_label);
2965 OP *gotoprobe = NULL;
2966 bool leaving_eval = FALSE;
2967 bool in_block = FALSE;
2968 bool pseudo_block = FALSE;
2969 PERL_CONTEXT *last_eval_cx = NULL;
2973 PL_lastgotoprobe = NULL;
2975 for (ix = cxstack_ix; ix >= 0; ix--) {
2977 switch (CxTYPE(cx)) {
2979 leaving_eval = TRUE;
2980 if (!CxTRYBLOCK(cx)) {
2981 gotoprobe = (last_eval_cx ?
2982 last_eval_cx->blk_eval.old_eval_root :
2987 /* else fall through */
2988 case CXt_LOOP_PLAIN:
2989 case CXt_LOOP_LAZYIV:
2990 case CXt_LOOP_LAZYSV:
2995 gotoprobe = OpSIBLING(cx->blk_oldcop);
3001 gotoprobe = OpSIBLING(cx->blk_oldcop);
3004 gotoprobe = PL_main_root;
3007 gotoprobe = CvROOT(cx->blk_sub.cv);
3008 pseudo_block = cBOOL(CxMULTICALL(cx));
3012 DIE(aTHX_ "Can't \"goto\" out of a pseudo block");
3015 DIE(aTHX_ "panic: goto, type=%u, ix=%ld",
3016 CxTYPE(cx), (long) ix);
3017 gotoprobe = PL_main_root;
3023 retop = dofindlabel(gotoprobe, label, label_len, label_flags,
3024 enterops, enterops + GOTO_DEPTH);
3027 if ( (sibl1 = OpSIBLING(gotoprobe)) &&
3028 sibl1->op_type == OP_UNSTACK &&
3029 (sibl2 = OpSIBLING(sibl1)))
3031 retop = dofindlabel(sibl2,
3032 label, label_len, label_flags, enterops,
3033 enterops + GOTO_DEPTH);
3039 DIE(aTHX_ "Can't \"goto\" out of a pseudo block");
3040 PL_lastgotoprobe = gotoprobe;
3043 DIE(aTHX_ "Can't find label %" UTF8f,
3044 UTF8fARG(label_flags, label_len, label));
3046 /* if we're leaving an eval, check before we pop any frames
3047 that we're not going to punt, otherwise the error
3050 if (leaving_eval && *enterops && enterops[1]) {
3052 for (i = 1; enterops[i]; i++)
3053 if (enterops[i]->op_type == OP_ENTERITER)
3054 DIE(aTHX_ "Can't \"goto\" into the middle of a foreach loop");
3057 if (*enterops && enterops[1]) {
3058 I32 i = enterops[1]->op_type == OP_ENTER && in_block ? 2 : 1;
3060 deprecate("\"goto\" to jump into a construct");
3063 /* pop unwanted frames */
3065 if (ix < cxstack_ix) {
3067 DIE(aTHX_ "panic: docatch: illegal ix=%ld", (long)ix);
3073 /* push wanted frames */
3075 if (*enterops && enterops[1]) {
3076 OP * const oldop = PL_op;
3077 ix = enterops[1]->op_type == OP_ENTER && in_block ? 2 : 1;
3078 for (; enterops[ix]; ix++) {
3079 PL_op = enterops[ix];
3080 /* Eventually we may want to stack the needed arguments
3081 * for each op. For now, we punt on the hard ones. */
3082 if (PL_op->op_type == OP_ENTERITER)
3083 DIE(aTHX_ "Can't \"goto\" into the middle of a foreach loop");
3084 PL_op->op_ppaddr(aTHX);
3092 if (!retop) retop = PL_main_start;
3094 PL_restartop = retop;
3095 PL_do_undump = TRUE;
3099 PL_restartop = 0; /* hmm, must be GNU unexec().. */
3100 PL_do_undump = FALSE;
3118 anum = 0; (void)POPs;
3124 && SvTRUE(cop_hints_fetch_pvs(PL_curcop, "vmsish_exit", 0)))
3127 VMSISH_HUSHED || (PL_curcop->op_private & OPpHUSH_VMSISH);
3130 PL_exit_flags |= PERL_EXIT_EXPECTED;
3132 PUSHs(&PL_sv_undef);
3139 S_save_lines(pTHX_ AV *array, SV *sv)
3141 const char *s = SvPVX_const(sv);
3142 const char * const send = SvPVX_const(sv) + SvCUR(sv);
3145 PERL_ARGS_ASSERT_SAVE_LINES;
3147 while (s && s < send) {
3149 SV * const tmpstr = newSV_type(SVt_PVMG);
3151 t = (const char *)memchr(s, '\n', send - s);
3157 sv_setpvn(tmpstr, s, t - s);
3158 av_store(array, line++, tmpstr);
3166 Check for the cases 0 or 3 of cur_env.je_ret, only used inside an eval context.
3168 0 is used as continue inside eval,
3170 3 is used for a die caught by an inner eval - continue inner loop
3172 See F<cop.h>: je_mustcatch, when set at any runlevel to TRUE, means eval ops must
3173 establish a local jmpenv to handle exception traps.
3178 S_docatch(pTHX_ Perl_ppaddr_t firstpp)
3181 OP * const oldop = PL_op;
3184 assert(CATCH_GET == TRUE);
3189 PL_op = firstpp(aTHX);
3194 /* die caught by an inner eval - continue inner loop */
3195 if (PL_restartop && PL_restartjmpenv == PL_top_env) {
3196 PL_restartjmpenv = NULL;
3197 PL_op = PL_restartop;
3206 NOT_REACHED; /* NOTREACHED */
3215 =for apidoc find_runcv
3217 Locate the CV corresponding to the currently executing sub or eval.
3218 If C<db_seqp> is non_null, skip CVs that are in the DB package and populate
3219 C<*db_seqp> with the cop sequence number at the point that the DB:: code was
3220 entered. (This allows debuggers to eval in the scope of the breakpoint
3221 rather than in the scope of the debugger itself.)
3227 Perl_find_runcv(pTHX_ U32 *db_seqp)
3229 return Perl_find_runcv_where(aTHX_ 0, 0, db_seqp);
3232 /* If this becomes part of the API, it might need a better name. */
3234 Perl_find_runcv_where(pTHX_ U8 cond, IV arg, U32 *db_seqp)
3241 PL_curcop == &PL_compiling
3243 : PL_curcop->cop_seq;
3245 for (si = PL_curstackinfo; si; si = si->si_prev) {
3247 for (ix = si->si_cxix; ix >= 0; ix--) {
3248 const PERL_CONTEXT *cx = &(si->si_cxstack[ix]);
3250 if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
3251 cv = cx->blk_sub.cv;
3252 /* skip DB:: code */
3253 if (db_seqp && PL_debstash && CvSTASH(cv) == PL_debstash) {
3254 *db_seqp = cx->blk_oldcop->cop_seq;
3257 if (cx->cx_type & CXp_SUB_RE)
3260 else if (CxTYPE(cx) == CXt_EVAL && !CxTRYBLOCK(cx))
3261 cv = cx->blk_eval.cv;
3264 case FIND_RUNCV_padid_eq:
3266 || CvPADLIST(cv)->xpadl_id != (U32)arg)
3269 case FIND_RUNCV_level_eq:
3270 if (level++ != arg) continue;
3278 return cond == FIND_RUNCV_padid_eq ? NULL : PL_main_cv;
3282 /* Run yyparse() in a setjmp wrapper. Returns:
3283 * 0: yyparse() successful
3284 * 1: yyparse() failed
3288 S_try_yyparse(pTHX_ int gramtype)
3293 assert(CxTYPE(CX_CUR()) == CXt_EVAL);
3297 ret = yyparse(gramtype) ? 1 : 0;
3304 NOT_REACHED; /* NOTREACHED */
3311 /* Compile a require/do or an eval ''.
3313 * outside is the lexically enclosing CV (if any) that invoked us.
3314 * seq is the current COP scope value.
3315 * hh is the saved hints hash, if any.
3317 * Returns a bool indicating whether the compile was successful; if so,
3318 * PL_eval_start contains the first op of the compiled code; otherwise,
3321 * This function is called from two places: pp_require and pp_entereval.
3322 * These can be distinguished by whether PL_op is entereval.
3326 S_doeval_compile(pTHX_ U8 gimme, CV* outside, U32 seq, HV *hh)
3329 OP * const saveop = PL_op;
3330 bool clear_hints = saveop->op_type != OP_ENTEREVAL;
3331 COP * const oldcurcop = PL_curcop;
3332 bool in_require = (saveop->op_type == OP_REQUIRE);
3336 PL_in_eval = (in_require
3337 ? (EVAL_INREQUIRE | (PL_in_eval & EVAL_INEVAL))
3339 ((PL_op->op_private & OPpEVAL_RE_REPARSING)
3340 ? EVAL_RE_REPARSING : 0)));
3344 evalcv = MUTABLE_CV(newSV_type(SVt_PVCV));
3346 assert(CxTYPE(CX_CUR()) == CXt_EVAL);
3347 CX_CUR()->blk_eval.cv = evalcv;
3348 CX_CUR()->blk_gimme = gimme;
3350 CvOUTSIDE_SEQ(evalcv) = seq;
3351 CvOUTSIDE(evalcv) = MUTABLE_CV(SvREFCNT_inc_simple(outside));
3353 /* set up a scratch pad */
3355 CvPADLIST_set(evalcv, pad_new(padnew_SAVE));
3356 PL_op = NULL; /* avoid PL_op and PL_curpad referring to different CVs */
3359 SAVEMORTALIZESV(evalcv); /* must remain until end of current statement */
3361 /* make sure we compile in the right package */
3363 if (CopSTASH_ne(PL_curcop, PL_curstash)) {
3364 SAVEGENERICSV(PL_curstash);
3365 PL_curstash = (HV *)CopSTASH(PL_curcop);
3366 if (SvTYPE(PL_curstash) != SVt_PVHV) PL_curstash = NULL;
3368 SvREFCNT_inc_simple_void(PL_curstash);
3369 save_item(PL_curstname);
3370 sv_sethek(PL_curstname, HvNAME_HEK(PL_curstash));
3373 /* XXX:ajgo do we really need to alloc an AV for begin/checkunit */
3374 SAVESPTR(PL_beginav);
3375 PL_beginav = newAV();
3376 SAVEFREESV(PL_beginav);
3377 SAVESPTR(PL_unitcheckav);
3378 PL_unitcheckav = newAV();
3379 SAVEFREESV(PL_unitcheckav);
3382 ENTER_with_name("evalcomp");
3383 SAVESPTR(PL_compcv);
3386 /* try to compile it */
3388 PL_eval_root = NULL;
3389 PL_curcop = &PL_compiling;
3390 if ((saveop->op_type != OP_REQUIRE) && (saveop->op_flags & OPf_SPECIAL))
3391 PL_in_eval |= EVAL_KEEPERR;
3398 hv_clear(GvHV(PL_hintgv));
3401 PL_hints = saveop->op_private & OPpEVAL_COPHH
3402 ? oldcurcop->cop_hints : (U32)saveop->op_targ;
3404 /* making 'use re eval' not be in scope when compiling the
3405 * qr/mabye_has_runtime_code_block/ ensures that we don't get
3406 * infinite recursion when S_has_runtime_code() gives a false
3407 * positive: the second time round, HINT_RE_EVAL isn't set so we
3408 * don't bother calling S_has_runtime_code() */
3409 if (PL_in_eval & EVAL_RE_REPARSING)
3410 PL_hints &= ~HINT_RE_EVAL;
3413 /* SAVEHINTS created a new HV in PL_hintgv, which we need to GC */
3414 SvREFCNT_dec(GvHV(PL_hintgv));
3415 GvHV(PL_hintgv) = hh;
3418 SAVECOMPILEWARNINGS();
3420 if (PL_dowarn & G_WARN_ALL_ON)
3421 PL_compiling.cop_warnings = pWARN_ALL ;
3422 else if (PL_dowarn & G_WARN_ALL_OFF)
3423 PL_compiling.cop_warnings = pWARN_NONE ;
3425 PL_compiling.cop_warnings = pWARN_STD ;
3428 PL_compiling.cop_warnings =
3429 DUP_WARNINGS(oldcurcop->cop_warnings);
3430 cophh_free(CopHINTHASH_get(&PL_compiling));
3431 if (Perl_cop_fetch_label(aTHX_ oldcurcop, NULL, NULL)) {
3432 /* The label, if present, is the first entry on the chain. So rather
3433 than writing a blank label in front of it (which involves an
3434 allocation), just use the next entry in the chain. */
3435 PL_compiling.cop_hints_hash
3436 = cophh_copy(oldcurcop->cop_hints_hash->refcounted_he_next);
3437 /* Check the assumption that this removed the label. */
3438 assert(Perl_cop_fetch_label(aTHX_ &PL_compiling, NULL, NULL) == NULL);
3441 PL_compiling.cop_hints_hash = cophh_copy(oldcurcop->cop_hints_hash);
3444 CALL_BLOCK_HOOKS(bhk_eval, saveop);
3446 /* note that yyparse() may raise an exception, e.g. C<BEGIN{die}>,
3447 * so honour CATCH_GET and trap it here if necessary */
3450 /* compile the code */
3451 yystatus = (!in_require && CATCH_GET) ? S_try_yyparse(aTHX_ GRAMPROG) : yyparse(GRAMPROG);
3453 if (yystatus || PL_parser->error_count || !PL_eval_root) {
3458 /* note that if yystatus == 3, then the require/eval died during
3459 * compilation, so the EVAL CX block has already been popped, and
3460 * various vars restored */
3461 if (yystatus != 3) {
3463 op_free(PL_eval_root);
3464 PL_eval_root = NULL;
3466 SP = PL_stack_base + POPMARK; /* pop original mark */
3468 assert(CxTYPE(cx) == CXt_EVAL);
3469 /* pop the CXt_EVAL, and if was a require, croak */
3470 S_pop_eval_context_maybe_croak(aTHX_ cx, ERRSV, 2);
3473 /* die_unwind() re-croaks when in require, having popped the
3474 * require EVAL context. So we should never catch a require
3476 assert(!in_require);
3479 if (!*(SvPV_nolen_const(errsv)))
3480 sv_setpvs(errsv, "Compilation error");
3482 if (gimme != G_ARRAY) PUSHs(&PL_sv_undef);
3487 /* Compilation successful. Now clean up */
3489 LEAVE_with_name("evalcomp");
3491 CopLINE_set(&PL_compiling, 0);
3492 SAVEFREEOP(PL_eval_root);
3493 cv_forget_slab(evalcv);
3495 DEBUG_x(dump_eval());
3497 /* Register with debugger: */
3498 if (PERLDB_INTER && saveop->op_type == OP_REQUIRE) {
3499 CV * const cv = get_cvs("DB::postponed", 0);
3503 XPUSHs(MUTABLE_SV(CopFILEGV(&PL_compiling)));
3505 call_sv(MUTABLE_SV(cv), G_DISCARD);
3509 if (PL_unitcheckav) {
3510 OP *es = PL_eval_start;
3511 call_list(PL_scopestack_ix, PL_unitcheckav);
3515 CvDEPTH(evalcv) = 1;
3516 SP = PL_stack_base + POPMARK; /* pop original mark */
3517 PL_op = saveop; /* The caller may need it. */
3518 PL_parser->lex_state = LEX_NOTPARSING; /* $^S needs this. */
3524 /* Return NULL if the file doesn't exist or isn't a file;
3525 * else return PerlIO_openn().
3529 S_check_type_and_open(pTHX_ SV *name)
3534 const char *p = SvPV_const(name, len);
3537 PERL_ARGS_ASSERT_CHECK_TYPE_AND_OPEN;
3539 /* checking here captures a reasonable error message when
3540 * PERL_DISABLE_PMC is true, but when PMC checks are enabled, the
3541 * user gets a confusing message about looking for the .pmc file
3542 * rather than for the .pm file so do the check in S_doopen_pm when
3543 * PMC is on instead of here. S_doopen_pm calls this func.
3544 * This check prevents a \0 in @INC causing problems.
3546 #ifdef PERL_DISABLE_PMC
3547 if (!IS_SAFE_PATHNAME(p, len, "require"))
3551 /* on Win32 stat is expensive (it does an open() and close() twice and
3552 a couple other IO calls), the open will fail with a dir on its own with
3553 errno EACCES, so only do a stat to separate a dir from a real EACCES
3554 caused by user perms */
3556 st_rc = PerlLIO_stat(p, &st);
3562 if(S_ISBLK(st.st_mode)) {
3566 else if(S_ISDIR(st.st_mode)) {
3575 retio = PerlIO_openn(aTHX_ ":", PERL_SCRIPT_MODE, -1, 0, 0, NULL, 1, &name);
3577 /* EACCES stops the INC search early in pp_require to implement
3578 feature RT #113422 */
3579 if(!retio && errno == EACCES) { /* exists but probably a directory */
3581 st_rc = PerlLIO_stat(p, &st);
3583 if(S_ISDIR(st.st_mode))
3585 else if(S_ISBLK(st.st_mode))
3596 /* doopen_pm(): return the equivalent of PerlIO_openn() on the given name,
3597 * but first check for bad names (\0) and non-files.
3598 * Also if the filename ends in .pm and unless PERL_DISABLE_PMC,
3599 * try loading Foo.pmc first.
3601 #ifndef PERL_DISABLE_PMC
3603 S_doopen_pm(pTHX_ SV *name)
3606 const char *p = SvPV_const(name, namelen);
3608 PERL_ARGS_ASSERT_DOOPEN_PM;
3610 /* check the name before trying for the .pmc name to avoid the
3611 * warning referring to the .pmc which the user probably doesn't
3612 * know or care about
3614 if (!IS_SAFE_PATHNAME(p, namelen, "require"))
3617 if (memENDPs(p, namelen, ".pm")) {
3618 SV *const pmcsv = sv_newmortal();
3621 SvSetSV_nosteal(pmcsv,name);
3622 sv_catpvs(pmcsv, "c");
3624 pmcio = check_type_and_open(pmcsv);
3628 return check_type_and_open(name);
3631 # define doopen_pm(name) check_type_and_open(name)
3632 #endif /* !PERL_DISABLE_PMC */
3634 /* require doesn't search in @INC for absolute names, or when the name is
3635 explicitly relative the current directory: i.e. ./, ../ */
3636 PERL_STATIC_INLINE bool
3637 S_path_is_searchable(const char *name)
3639 PERL_ARGS_ASSERT_PATH_IS_SEARCHABLE;
3641 if (PERL_FILE_IS_ABSOLUTE(name)
3643 || (*name == '.' && ((name[1] == '/' ||
3644 (name[1] == '.' && name[2] == '/'))
3645 || (name[1] == '\\' ||
3646 ( name[1] == '.' && name[2] == '\\')))
3649 || (*name == '.' && (name[1] == '/' ||
3650 (name[1] == '.' && name[2] == '/')))
3661 /* implement 'require 5.010001' */
3664 S_require_version(pTHX_ SV *sv)
3668 sv = sv_2mortal(new_version(sv));
3669 if (!Perl_sv_derived_from_pvn(aTHX_ PL_patchlevel, STR_WITH_LEN("version"), 0))
3670 upg_version(PL_patchlevel, TRUE);
3671 if (cUNOP->op_first->op_type == OP_CONST && cUNOP->op_first->op_private & OPpCONST_NOVER) {
3672 if ( vcmp(sv,PL_patchlevel) <= 0 )
3673 DIE(aTHX_ "Perls since %" SVf " too modern--this is %" SVf ", stopped",
3674 SVfARG(sv_2mortal(vnormal(sv))),
3675 SVfARG(sv_2mortal(vnormal(PL_patchlevel)))
3679 if ( vcmp(sv,PL_patchlevel) > 0 ) {
3682 SV * const req = SvRV(sv);
3683 SV * const pv = *hv_fetchs(MUTABLE_HV(req), "original", FALSE);
3685 /* get the left hand term */
3686 lav = MUTABLE_AV(SvRV(*hv_fetchs(MUTABLE_HV(req), "version", FALSE)));
3688 first = SvIV(*av_fetch(lav,0,0));
3689 if ( first > (int)PERL_REVISION /* probably 'use 6.0' */
3690 || hv_exists(MUTABLE_HV(req), "qv", 2 ) /* qv style */
3691 || av_tindex(lav) > 1 /* FP with > 3 digits */
3692 || strstr(SvPVX(pv),".0") /* FP with leading 0 */
3694 DIE(aTHX_ "Perl %" SVf " required--this is only "
3695 "%" SVf ", stopped",
3696 SVfARG(sv_2mortal(vnormal(req))),
3697 SVfARG(sv_2mortal(vnormal(PL_patchlevel)))
3700 else { /* probably 'use 5.10' or 'use 5.8' */
3704 if (av_tindex(lav)>=1)
3705 second = SvIV(*av_fetch(lav,1,0));
3707 second /= second >= 600 ? 100 : 10;
3708 hintsv = Perl_newSVpvf(aTHX_ "v%d.%d.0",
3709 (int)first, (int)second);
3710 upg_version(hintsv, TRUE);
3712 DIE(aTHX_ "Perl %" SVf " required (did you mean %" SVf "?)"
3713 "--this is only %" SVf ", stopped",
3714 SVfARG(sv_2mortal(vnormal(req))),
3715 SVfARG(sv_2mortal(vnormal(sv_2mortal(hintsv)))),
3716 SVfARG(sv_2mortal(vnormal(PL_patchlevel)))
3725 /* Handle C<require Foo::Bar>, C<require "Foo/Bar.pm"> and C<do "Foo.pm">.
3726 * The first form will have already been converted at compile time to
3727 * the second form */
3730 S_require_file(pTHX_ SV *sv)
3740 int vms_unixname = 0;
3743 /* tryname is the actual pathname (with @INC prefix) which was loaded.
3744 * It's stored as a value in %INC, and used for error messages */
3745 const char *tryname = NULL;
3746 SV *namesv = NULL; /* SV equivalent of tryname */
3747 const U8 gimme = GIMME_V;
3748 int filter_has_file = 0;
3749 PerlIO *tryrsfp = NULL;
3750 SV *filter_cache = NULL;
3751 SV *filter_state = NULL;
3752 SV *filter_sub = NULL;
3756 bool path_searchable;
3757 I32 old_savestack_ix;
3758 const bool op_is_require = PL_op->op_type == OP_REQUIRE;
3759 const char *const op_name = op_is_require ? "require" : "do";
3760 SV ** svp_cached = NULL;
3762 assert(op_is_require || PL_op->op_type == OP_DOFILE);
3765 DIE(aTHX_ "Missing or undefined argument to %s", op_name);
3766 name = SvPV_nomg_const(sv, len);
3767 if (!(name && len > 0 && *name))
3768 DIE(aTHX_ "Missing or undefined argument to %s", op_name);
3771 /* try to return earlier (save the SAFE_PATHNAME check) if INC already got the name */
3772 if (op_is_require) {
3773 /* can optimize to only perform one single lookup */
3774 svp_cached = hv_fetch(GvHVn(PL_incgv), (char*) name, len, 0);
3775 if ( svp_cached && *svp_cached != &PL_sv_undef ) RETPUSHYES;
3779 if (!IS_SAFE_PATHNAME(name, len, op_name)) {
3780 if (!op_is_require) {
3784 DIE(aTHX_ "Can't locate %s: %s",
3785 pv_escape(newSVpvs_flags("",SVs_TEMP),name,len,len*2,
3786 NULL, SvUTF8(sv)?PERL_PV_ESCAPE_UNI:0),
3789 TAINT_PROPER(op_name);
3791 path_searchable = path_is_searchable(name);
3794 /* The key in the %ENV hash is in the syntax of file passed as the argument
3795 * usually this is in UNIX format, but sometimes in VMS format, which
3796 * can result in a module being pulled in more than once.
3797 * To prevent this, the key must be stored in UNIX format if the VMS
3798 * name can be translated to UNIX.
3802 tounixspec(name, SvPVX(sv_2mortal(newSVpv("", VMS_MAXRSS-1)))))
3804 unixlen = strlen(unixname);
3810 /* if not VMS or VMS name can not be translated to UNIX, pass it
3813 unixname = (char *) name;
3816 if (op_is_require) {
3817 /* reuse the previous hv_fetch result if possible */
3818 SV * const * const svp = svp_cached ? svp_cached : hv_fetch(GvHVn(PL_incgv), unixname, unixlen, 0);
3820 if (*svp != &PL_sv_undef)
3823 DIE(aTHX_ "Attempt to reload %s aborted.\n"
3824 "Compilation failed in require", unixname);
3827 /*XXX OPf_KIDS should always be true? -dapm 4/2017 */
3828 if (PL_op->op_flags & OPf_KIDS) {
3829 SVOP * const kid = (SVOP*)cUNOP->op_first;
3831 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
3832 /* Make sure that a bareword module name (e.g. ::Foo::Bar)
3833 * doesn't map to a naughty pathname like /Foo/Bar.pm.
3834 * Note that the parser will normally detect such errors
3835 * at compile time before we reach here, but
3836 * Perl_load_module() can fake up an identical optree
3837 * without going near the parser, and being able to put
3838 * anything as the bareword. So we include a duplicate set
3839 * of checks here at runtime.
3841 const STRLEN package_len = len - 3;
3842 const char slashdot[2] = {'/', '.'};
3844 const char backslashdot[2] = {'\\', '.'};
3847 /* Disallow *purported* barewords that map to absolute
3848 filenames, filenames relative to the current or parent
3849 directory, or (*nix) hidden filenames. Also sanity check
3850 that the generated filename ends .pm */
3851 if (!path_searchable || len < 3 || name[0] == '.'
3852 || !memEQs(name + package_len, len - package_len, ".pm"))
3853 DIE(aTHX_ "Bareword in require maps to disallowed filename \"%" SVf "\"", sv);
3854 if (memchr(name, 0, package_len)) {
3855 /* diag_listed_as: Bareword in require contains "%s" */
3856 DIE(aTHX_ "Bareword in require contains \"\\0\"");
3858 if (ninstr(name, name + package_len, slashdot,
3859 slashdot + sizeof(slashdot))) {
3860 /* diag_listed_as: Bareword in require contains "%s" */
3861 DIE(aTHX_ "Bareword in require contains \"/.\"");
3864 if (ninstr(name, name + package_len, backslashdot,
3865 backslashdot + sizeof(backslashdot))) {
3866 /* diag_listed_as: Bareword in require contains "%s" */
3867 DIE(aTHX_ "Bareword in require contains \"\\.\"");
3874 PERL_DTRACE_PROBE_FILE_LOADING(unixname);
3876 /* Try to locate and open a file, possibly using @INC */
3878 /* with "/foo/bar.pm", "./foo.pm" and "../foo/bar.pm", try to load
3879 * the file directly rather than via @INC ... */
3880 if (!path_searchable) {
3881 /* At this point, name is SvPVX(sv) */
3883 tryrsfp = doopen_pm(sv);
3886 /* ... but if we fail, still search @INC for code references;
3887 * these are applied even on on-searchable paths (except
3888 * if we got EACESS).
3890 * For searchable paths, just search @INC normally
3892 if (!tryrsfp && !(errno == EACCES && !path_searchable)) {
3893 AV * const ar = GvAVn(PL_incgv);
3900 namesv = newSV_type(SVt_PV);
3901 for (i = 0; i <= AvFILL(ar); i++) {
3902 SV * const dirsv = *av_fetch(ar, i, TRUE);
3910 if (SvTYPE(SvRV(loader)) == SVt_PVAV
3911 && !SvOBJECT(SvRV(loader)))
3913 loader = *av_fetch(MUTABLE_AV(SvRV(loader)), 0, TRUE);
3917 Perl_sv_setpvf(aTHX_ namesv, "/loader/0x%" UVxf "/%s",
3918 PTR2UV(SvRV(dirsv)), name);
3919 tryname = SvPVX_const(namesv);
3922 if (SvPADTMP(nsv)) {
3923 nsv = sv_newmortal();
3924 SvSetSV_nosteal(nsv,sv);
3927 ENTER_with_name("call_INC");
3935 if (SvGMAGICAL(loader)) {
3936 SV *l = sv_newmortal();
3937 sv_setsv_nomg(l, loader);
3940 if (sv_isobject(loader))
3941 count = call_method("INC", G_ARRAY);
3943 count = call_sv(loader, G_ARRAY);
3953 if (SvROK(arg) && (SvTYPE(SvRV(arg)) <= SVt_PVLV)
3954 && !isGV_with_GP(SvRV(arg))) {
3955 filter_cache = SvRV(arg);
3962 if (SvROK(arg) && isGV_with_GP(SvRV(arg))) {
3966 if (isGV_with_GP(arg)) {
3967 IO * const io = GvIO((const GV *)arg);
3972 tryrsfp = IoIFP(io);
3973 if (IoOFP(io) && IoOFP(io) != IoIFP(io)) {
3974 PerlIO_close(IoOFP(io));
3985 if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVCV) {
3987 SvREFCNT_inc_simple_void_NN(filter_sub);
3990 filter_state = SP[i];
3991 SvREFCNT_inc_simple_void(filter_state);
3995 if (!tryrsfp && (filter_cache || filter_sub)) {
3996 tryrsfp = PerlIO_open(BIT_BUCKET,
4002 /* FREETMPS may free our filter_cache */
4003 SvREFCNT_inc_simple_void(filter_cache);
4007 LEAVE_with_name("call_INC");
4009 /* Now re-mortalize it. */
4010 sv_2mortal(filter_cache);
4012 /* Adjust file name if the hook has set an %INC entry.
4013 This needs to happen after the FREETMPS above. */
4014 svp = hv_fetch(GvHVn(PL_incgv), name, len, 0);
4016 tryname = SvPV_nolen_const(*svp);
4023 filter_has_file = 0;
4024 filter_cache = NULL;
4026 SvREFCNT_dec_NN(filter_state);
4027 filter_state = NULL;
4030 SvREFCNT_dec_NN(filter_sub);
4034 else if (path_searchable) {
4035 /* match against a plain @INC element (non-searchable
4036 * paths are only matched against refs in @INC) */
4041 dir = SvPV_nomg_const(dirsv, dirlen);
4047 if (!IS_SAFE_SYSCALL(dir, dirlen, "@INC entry", op_name))
4051 tounixpath(dir, SvPVX(sv_2mortal(newSVpv("", VMS_MAXRSS-1)))))
4054 sv_setpv(namesv, unixdir);
4055 sv_catpv(namesv, unixname);
4056 #elif defined(__SYMBIAN32__)
4057 if (PL_origfilename[0] &&
4058 PL_origfilename[1] == ':' &&
4059 !(dir[0] && dir[1] == ':'))
4060 Perl_sv_setpvf(aTHX_ namesv,
4065 Perl_sv_setpvf(aTHX_ namesv,
4069 /* The equivalent of
4070 Perl_sv_setpvf(aTHX_ namesv, "%s/%s", dir, name);
4071 but without the need to parse the format string, or
4072 call strlen on either pointer, and with the correct
4073 allocation up front. */
4075 char *tmp = SvGROW(namesv, dirlen + len + 2);
4077 memcpy(tmp, dir, dirlen);
4080 /* Avoid '<dir>//<file>' */
4081 if (!dirlen || *(tmp-1) != '/') {
4084 /* So SvCUR_set reports the correct length below */
4088 /* name came from an SV, so it will have a '\0' at the
4089 end that we can copy as part of this memcpy(). */
4090 memcpy(tmp, name, len + 1);
4092 SvCUR_set(namesv, dirlen + len + 1);
4096 TAINT_PROPER(op_name);
4097 tryname = SvPVX_const(namesv);
4098 tryrsfp = doopen_pm(namesv);
4100 if (tryname[0] == '.' && tryname[1] == '/') {
4102 while (*++tryname == '/') {}
4106 else if (errno == EMFILE || errno == EACCES) {
4107 /* no point in trying other paths if out of handles;
4108 * on the other hand, if we couldn't open one of the
4109 * files, then going on with the search could lead to
4110 * unexpected results; see perl #113422
4119 /* at this point we've ether opened a file (tryrsfp) or set errno */
4121 saved_errno = errno; /* sv_2mortal can realloc things */
4124 /* we failed; croak if require() or return undef if do() */
4125 if (op_is_require) {
4126 if(saved_errno == EMFILE || saved_errno == EACCES) {
4127 /* diag_listed_as: Can't locate %s */
4128 DIE(aTHX_ "Can't locate %s: %s: %s",
4129 name, tryname, Strerror(saved_errno));
4131 if (path_searchable) { /* did we lookup @INC? */
4132 AV * const ar = GvAVn(PL_incgv);
4134 SV *const msg = newSVpvs_flags("", SVs_TEMP);
4135 SV *const inc = newSVpvs_flags("", SVs_TEMP);
4136 for (i = 0; i <= AvFILL(ar); i++) {
4137 sv_catpvs(inc, " ");
4138 sv_catsv(inc, *av_fetch(ar, i, TRUE));
4140 if (memENDPs(name, len, ".pm")) {
4141 const char *e = name + len - (sizeof(".pm") - 1);
4143 bool utf8 = cBOOL(SvUTF8(sv));
4145 /* if the filename, when converted from "Foo/Bar.pm"
4146 * form back to Foo::Bar form, makes a valid
4147 * package name (i.e. parseable by C<require
4148 * Foo::Bar>), then emit a hint.
4150 * this loop is modelled after the one in
4154 if (utf8 && isIDFIRST_utf8_safe(c, e)) {
4156 while (c < e && isIDCONT_utf8_safe(
4157 (const U8*) c, (const U8*) e))
4160 else if (isWORDCHAR_A(*c)) {
4161 while (c < e && isWORDCHAR_A(*c))
4170 if (c == e && isIDFIRST_lazy_if_safe(name, e, utf8)) {
4171 sv_catpv(msg, " (you may need to install the ");
4172 for (c = name; c < e; c++) {
4174 sv_catpvs(msg, "::");
4177 sv_catpvn(msg, c, 1);
4180 sv_catpv(msg, " module)");
4183 else if (memENDs(name, len, ".h")) {
4184 sv_catpv(msg, " (change .h to .ph maybe?) (did you run h2ph?)");
4186 else if (memENDs(name, len, ".ph")) {
4187 sv_catpv(msg, " (did you run h2ph?)");
4190 /* diag_listed_as: Can't locate %s */
4192 "Can't locate %s in @INC%" SVf " (@INC contains:%" SVf ")",
4196 DIE(aTHX_ "Can't locate %s", name);
4199 #ifdef DEFAULT_INC_EXCLUDES_DOT
4203 /* the complication is to match the logic from doopen_pm() so
4204 * we don't treat do "sda1" as a previously successful "do".
4206 bool do_warn = namesv && ckWARN_d(WARN_DEPRECATED)
4207 && PerlLIO_stat(name, &st) == 0 && !S_ISDIR(st.st_mode) && !S_ISBLK(st.st_mode)
4208 && (io = PerlIO_openn(aTHX_ ":", PERL_SCRIPT_MODE, -1, 0, 0, NULL, 1, &sv)) != NULL;
4214 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
4215 "do \"%s\" failed, '.' is no longer in @INC; "
4216 "did you mean do \"./%s\"?",
4225 SETERRNO(0, SS_NORMAL);
4227 /* Update %INC. Assume success here to prevent recursive requirement. */
4228 /* name is never assigned to again, so len is still strlen(name) */
4229 /* Check whether a hook in @INC has already filled %INC */
4231 (void)hv_store(GvHVn(PL_incgv),
4232 unixname, unixlen, newSVpv(tryname,0),0);
4234 SV** const svp = hv_fetch(GvHVn(PL_incgv), unixname, unixlen, 0);
4236 (void)hv_store(GvHVn(PL_incgv),
4237 unixname, unixlen, SvREFCNT_inc_simple(hook_sv), 0 );
4240 /* Now parse the file */
4242 old_savestack_ix = PL_savestack_ix;
4243 SAVECOPFILE_FREE(&PL_compiling);
4244 CopFILE_set(&PL_compiling, tryname);
4245 lex_start(NULL, tryrsfp, 0);
4247 if (filter_sub || filter_cache) {
4248 /* We can use the SvPV of the filter PVIO itself as our cache, rather
4249 than hanging another SV from it. In turn, filter_add() optionally
4250 takes the SV to use as the filter (or creates a new SV if passed
4251 NULL), so simply pass in whatever value filter_cache has. */
4252 SV * const fc = filter_cache ? newSV(0) : NULL;
4254 if (fc) sv_copypv(fc, filter_cache);
4255 datasv = filter_add(S_run_user_filter, fc);
4256 IoLINES(datasv) = filter_has_file;
4257 IoTOP_GV(datasv) = MUTABLE_GV(filter_state);
4258 IoBOTTOM_GV(datasv) = MUTABLE_GV(filter_sub);
4261 /* switch to eval mode */
4263 cx = cx_pushblock(CXt_EVAL, gimme, SP, old_savestack_ix);
4264 cx_pusheval(cx, PL_op->op_next, newSVpv(name, 0));
4266 SAVECOPLINE(&PL_compiling);
4267 CopLINE_set(&PL_compiling, 0);
4271 if (doeval_compile(gimme, NULL, PL_curcop->cop_seq, NULL))
4274 op = PL_op->op_next;
4276 PERL_DTRACE_PROBE_FILE_LOADED(unixname);
4282 /* also used for: pp_dofile() */
4286 RUN_PP_CATCHABLY(Perl_pp_require);
4293 return ((SvNIOKp(sv) || SvVOK(sv)) && PL_op->op_type != OP_DOFILE)
4294 ? S_require_version(aTHX_ sv)
4295 : S_require_file(aTHX_ sv);
4300 /* This is a op added to hold the hints hash for
4301 pp_entereval. The hash can be modified by the code
4302 being eval'ed, so we return a copy instead. */
4307 mXPUSHs(MUTABLE_SV(hv_copy_hints_hv(MUTABLE_HV(cSVOP_sv))));
4319 char tbuf[TYPE_DIGITS(long) + 12];
4327 I32 old_savestack_ix;
4329 RUN_PP_CATCHABLY(Perl_pp_entereval);
4332 was = PL_breakable_sub_gen;
4333 saved_delete = FALSE;
4337 bytes = PL_op->op_private & OPpEVAL_BYTES;
4339 if (PL_op->op_private & OPpEVAL_HAS_HH) {
4340 saved_hh = MUTABLE_HV(SvREFCNT_inc(POPs));
4342 else if (PL_hints & HINT_LOCALIZE_HH || (
4343 PL_op->op_private & OPpEVAL_COPHH
4344 && PL_curcop->cop_hints & HINT_LOCALIZE_HH
4346 saved_hh = cop_hints_2hv(PL_curcop, 0);
4347 hv_magic(saved_hh, NULL, PERL_MAGIC_hints);
4351 /* make sure we've got a plain PV (no overload etc) before testing
4352 * for taint. Making a copy here is probably overkill, but better
4353 * safe than sorry */
4355 const char * const p = SvPV_const(sv, len);
4357 sv = newSVpvn_flags(p, len, SVs_TEMP | SvUTF8(sv));
4358 lex_flags |= LEX_START_COPIED;
4360 if (bytes && SvUTF8(sv))
4361 SvPVbyte_force(sv, len);
4363 else if (bytes && SvUTF8(sv)) {
4364 /* Don't modify someone else's scalar */
4367 (void)sv_2mortal(sv);
4368 SvPVbyte_force(sv,len);
4369 lex_flags |= LEX_START_COPIED;
4372 TAINT_IF(SvTAINTED(sv));
4373 TAINT_PROPER("eval");
4375 old_savestack_ix = PL_savestack_ix;
4377 lex_start(sv, NULL, lex_flags | (PL_op->op_private & OPpEVAL_UNICODE
4378 ? LEX_IGNORE_UTF8_HINTS
4379 : bytes ? LEX_EVALBYTES : LEX_START_SAME_FILTER
4383 /* switch to eval mode */
4385 if (PERLDB_NAMEEVAL && CopLINE(PL_curcop)) {
4386 SV * const temp_sv = sv_newmortal();
4387 Perl_sv_setpvf(aTHX_ temp_sv, "_<(eval %lu)[%s:%" IVdf "]",
4388 (unsigned long)++PL_evalseq,
4389 CopFILE(PL_curcop), (IV)CopLINE(PL_curcop));
4390 tmpbuf = SvPVX(temp_sv);
4391 len = SvCUR(temp_sv);
4394 len = my_snprintf(tmpbuf, sizeof(tbuf), "_<(eval %lu)", (unsigned long)++PL_evalseq);
4395 SAVECOPFILE_FREE(&PL_compiling);
4396 CopFILE_set(&PL_compiling, tmpbuf+2);
4397 SAVECOPLINE(&PL_compiling);
4398 CopLINE_set(&PL_compiling, 1);
4399 /* special case: an eval '' executed within the DB package gets lexically
4400 * placed in the first non-DB CV rather than the current CV - this
4401 * allows the debugger to execute code, find lexicals etc, in the
4402 * scope of the code being debugged. Passing &seq gets find_runcv
4403 * to do the dirty work for us */
4404 runcv = find_runcv(&seq);
4407 cx = cx_pushblock((CXt_EVAL|CXp_REAL), gimme, SP, old_savestack_ix);
4408 cx_pusheval(cx, PL_op->op_next, NULL);
4410 /* prepare to compile string */
4412 if (PERLDB_LINE_OR_SAVESRC && PL_curstash != PL_debstash)
4413 save_lines(CopFILEAV(&PL_compiling), PL_parser->linestr);
4415 /* XXX For C<eval "...">s within BEGIN {} blocks, this ends up
4416 deleting the eval's FILEGV from the stash before gv_check() runs
4417 (i.e. before run-time proper). To work around the coredump that
4418 ensues, we always turn GvMULTI_on for any globals that were
4419 introduced within evals. See force_ident(). GSAR 96-10-12 */
4420 char *const safestr = savepvn(tmpbuf, len);
4421 SAVEDELETE(PL_defstash, safestr, len);
4422 saved_delete = TRUE;
4427 if (doeval_compile(gimme, runcv, seq, saved_hh)) {
4428 if (was != PL_breakable_sub_gen /* Some subs defined here. */
4429 ? PERLDB_LINE_OR_SAVESRC
4430 : PERLDB_SAVESRC_NOSUBS) {
4431 /* Retain the filegv we created. */
4432 } else if (!saved_delete) {
4433 char *const safestr = savepvn(tmpbuf, len);
4434 SAVEDELETE(PL_defstash, safestr, len);
4436 return PL_eval_start;
4438 /* We have already left the scope set up earlier thanks to the LEAVE
4439 in doeval_compile(). */
4440 if (was != PL_breakable_sub_gen /* Some subs defined here. */
4441 ? PERLDB_LINE_OR_SAVESRC
4442 : PERLDB_SAVESRC_INVALID) {
4443 /* Retain the filegv we created. */
4444 } else if (!saved_delete) {
4445 (void)hv_delete(PL_defstash, tmpbuf, len, G_DISCARD);
4447 return PL_op->op_next;
4452 /* also tail-called by pp_return */
4467 assert(CxTYPE(cx) == CXt_EVAL);
4469 oldsp = PL_stack_base + cx->blk_oldsp;
4470 gimme = cx->blk_gimme;
4472 /* did require return a false value? */
4473 failed = CxOLD_OP_TYPE(cx) == OP_REQUIRE
4474 && !(gimme == G_SCALAR
4475 ? SvTRUE_NN(*PL_stack_sp)
4476 : PL_stack_sp > oldsp);
4478 if (gimme == G_VOID) {
4479 PL_stack_sp = oldsp;
4480 /* free now to avoid late-called destructors clobbering $@ */
4484 leave_adjust_stacks(oldsp, oldsp, gimme, 0);
4486 /* the cx_popeval does a leavescope, which frees the optree associated
4487 * with eval, which if it frees the nextstate associated with
4488 * PL_curcop, sets PL_curcop to NULL. Which can mess up freeing a
4489 * regex when running under 'use re Debug' because it needs PL_curcop
4490 * to get the current hints. So restore it early.
4492 PL_curcop = cx->blk_oldcop;
4494 /* grab this value before cx_popeval restores the old PL_in_eval */
4495 keep = cBOOL(PL_in_eval & EVAL_KEEPERR);
4496 retop = cx->blk_eval.retop;
4497 evalcv = cx->blk_eval.cv;
4499 assert(CvDEPTH(evalcv) == 1);
4501 CvDEPTH(evalcv) = 0;
4503 /* pop the CXt_EVAL, and if a require failed, croak */
4504 S_pop_eval_context_maybe_croak(aTHX_ cx, NULL, failed);
4512 /* Common code for Perl_call_sv and Perl_fold_constants, put here to keep it
4513 close to the related Perl_create_eval_scope. */
4515 Perl_delete_eval_scope(pTHX)
4526 /* Common-ish code salvaged from Perl_call_sv and pp_entertry, because it was
4527 also needed by Perl_fold_constants. */
4529 Perl_create_eval_scope(pTHX_ OP *retop, U32 flags)
4532 const U8 gimme = GIMME_V;
4534 cx = cx_pushblock((CXt_EVAL|CXp_TRYBLOCK), gimme,
4535 PL_stack_sp, PL_savestack_ix);
4536 cx_pusheval(cx, retop, NULL);
4538 PL_in_eval = EVAL_INEVAL;
4539 if (flags & G_KEEPERR)
4540 PL_in_eval |= EVAL_KEEPERR;
4543 if (flags & G_FAKINGEVAL) {
4544 PL_eval_root = PL_op; /* Only needed so that goto works right. */
4550 RUN_PP_CATCHABLY(Perl_pp_entertry);
4553 create_eval_scope(cLOGOP->op_other->op_next, 0);
4554 return PL_op->op_next;
4558 /* also tail-called by pp_return */
4570 assert(CxTYPE(cx) == CXt_EVAL);
4571 oldsp = PL_stack_base + cx->blk_oldsp;
4572 gimme = cx->blk_gimme;
4574 if (gimme == G_VOID) {
4575 PL_stack_sp = oldsp;
4576 /* free now to avoid late-called destructors clobbering $@ */
4580 leave_adjust_stacks(oldsp, oldsp, gimme, 1);
4584 retop = cx->blk_eval.retop;
4595 const U8 gimme = GIMME_V;
4599 assert(!PL_op->op_targ); /* used to be set for lexical $_ */
4600 GvSV(PL_defgv) = SvREFCNT_inc(newsv);
4602 cx = cx_pushblock(CXt_GIVEN, gimme, SP, PL_savestack_ix);
4603 cx_pushgiven(cx, origsv);
4613 PERL_UNUSED_CONTEXT;
4616 assert(CxTYPE(cx) == CXt_GIVEN);
4617 oldsp = PL_stack_base + cx->blk_oldsp;
4618 gimme = cx->blk_gimme;
4620 if (gimme == G_VOID)
4621 PL_stack_sp = oldsp;
4623 leave_adjust_stacks(oldsp, oldsp, gimme, 1);
4633 /* Helper routines used by pp_smartmatch */
4635 S_make_matcher(pTHX_ REGEXP *re)
4637 PMOP *matcher = (PMOP *) newPMOP(OP_MATCH, OPf_WANT_SCALAR | OPf_STACKED);
4639 PERL_ARGS_ASSERT_MAKE_MATCHER;
4641 PM_SETRE(matcher, ReREFCNT_inc(re));
4643 SAVEFREEOP((OP *) matcher);
4644 ENTER_with_name("matcher"); SAVETMPS;
4650 S_matcher_matches_sv(pTHX_ PMOP *matcher, SV *sv)
4655 PERL_ARGS_ASSERT_MATCHER_MATCHES_SV;
4657 PL_op = (OP *) matcher;
4660 (void) Perl_pp_match(aTHX);
4662 result = SvTRUEx(POPs);
4669 S_destroy_matcher(pTHX_ PMOP *matcher)
4671 PERL_ARGS_ASSERT_DESTROY_MATCHER;
4672 PERL_UNUSED_ARG(matcher);
4675 LEAVE_with_name("matcher");
4678 /* Do a smart match */
4681 DEBUG_M(Perl_deb(aTHX_ "Starting smart match resolution\n"));
4682 return do_smartmatch(NULL, NULL, 0);
4685 /* This version of do_smartmatch() implements the
4686 * table of smart matches that is found in perlsyn.
4689 S_do_smartmatch(pTHX_ HV *seen_this, HV *seen_other, const bool copied)
4693 bool object_on_left = FALSE;
4694 SV *e = TOPs; /* e is for 'expression' */
4695 SV *d = TOPm1s; /* d is for 'default', as in PL_defgv */
4697 /* Take care only to invoke mg_get() once for each argument.
4698 * Currently we do this by copying the SV if it's magical. */
4700 if (!copied && SvGMAGICAL(d))
4701 d = sv_mortalcopy(d);
4708 e = sv_mortalcopy(e);
4710 /* First of all, handle overload magic of the rightmost argument */
4713 DEBUG_M(Perl_deb(aTHX_ " applying rule Any-Object\n"));
4714 DEBUG_M(Perl_deb(aTHX_ " attempting overload\n"));
4716 tmpsv = amagic_call(d, e, smart_amg, AMGf_noleft);
4723 DEBUG_M(Perl_deb(aTHX_ " failed to run overload method; continuing...\n"));
4726 SP -= 2; /* Pop the values */
4731 DEBUG_M(Perl_deb(aTHX_ " applying rule Any-undef\n"));
4738 if (SvROK(e) && SvOBJECT(SvRV(e)) && (SvTYPE(SvRV(e)) != SVt_REGEXP)) {
4739 DEBUG_M(Perl_deb(aTHX_ " applying rule Any-Object\n"));
4740 Perl_croak(aTHX_ "Smart matching a non-overloaded object breaks encapsulation");
4742 if (SvROK(d) && SvOBJECT(SvRV(d)) && (SvTYPE(SvRV(d)) != SVt_REGEXP))
4743 object_on_left = TRUE;
4746 if (SvROK(e) && SvTYPE(SvRV(e)) == SVt_PVCV) {
4748 if (object_on_left) {
4749 goto sm_any_sub; /* Treat objects like scalars */
4751 else if (SvROK(d) && SvTYPE(SvRV(d)) == SVt_PVHV) {
4752 /* Test sub truth for each key */
4754 bool andedresults = TRUE;
4755 HV *hv = (HV*) SvRV(d);
4756 I32 numkeys = hv_iterinit(hv);
4757 DEBUG_M(Perl_deb(aTHX_ " applying rule Hash-CodeRef\n"));
4760 while ( (he = hv_iternext(hv)) ) {
4761 DEBUG_M(Perl_deb(aTHX_ " testing hash key...\n"));
4762 ENTER_with_name("smartmatch_hash_key_test");
4765 PUSHs(hv_iterkeysv(he));
4767 c = call_sv(e, G_SCALAR);
4770 andedresults = FALSE;
4772 andedresults = SvTRUEx(POPs) && andedresults;
4774 LEAVE_with_name("smartmatch_hash_key_test");
4781 else if (SvROK(d) && SvTYPE(SvRV(d)) == SVt_PVAV) {
4782 /* Test sub truth for each element */
4784 bool andedresults = TRUE;
4785 AV *av = (AV*) SvRV(d);
4786 const I32 len = av_tindex(av);
4787 DEBUG_M(Perl_deb(aTHX_ " applying rule Array-CodeRef\n"));
4790 for (i = 0; i <= len; ++i) {
4791 SV * const * const svp = av_fetch(av, i, FALSE);
4792 DEBUG_M(Perl_deb(aTHX_ " testing array element...\n"));
4793 ENTER_with_name("smartmatch_array_elem_test");
4799 c = call_sv(e, G_SCALAR);
4802 andedresults = FALSE;
4804 andedresults = SvTRUEx(POPs) && andedresults;
4806 LEAVE_with_name("smartmatch_array_elem_test");
4815 DEBUG_M(Perl_deb(aTHX_ " applying rule Any-CodeRef\n"));
4816 ENTER_with_name("smartmatch_coderef");
4821 c = call_sv(e, G_SCALAR);
4825 else if (SvTEMP(TOPs))
4826 SvREFCNT_inc_void(TOPs);
4828 LEAVE_with_name("smartmatch_coderef");
4833 else if (SvROK(e) && SvTYPE(SvRV(e)) == SVt_PVHV) {
4834 if (object_on_left) {
4835 goto sm_any_hash; /* Treat objects like scalars */
4837 else if (!SvOK(d)) {
4838 DEBUG_M(Perl_deb(aTHX_ " applying rule Any-Hash ($a undef)\n"));
4841 else if (SvROK(d) && SvTYPE(SvRV(d)) == SVt_PVHV) {
4842 /* Check that the key-sets are identical */
4844 HV *other_hv = MUTABLE_HV(SvRV(d));
4847 U32 this_key_count = 0,
4848 other_key_count = 0;
4849 HV *hv = MUTABLE_HV(SvRV(e));
4851 DEBUG_M(Perl_deb(aTHX_ " applying rule Hash-Hash\n"));
4852 /* Tied hashes don't know how many keys they have. */
4853 tied = cBOOL(SvTIED_mg((SV*)hv, PERL_MAGIC_tied));
4854 other_tied = cBOOL(SvTIED_mg((const SV *)other_hv, PERL_MAGIC_tied));
4858 HV * const temp = other_hv;
4864 else if(HvUSEDKEYS((const HV *) hv) != HvUSEDKEYS(other_hv))
4868 /* The hashes have the same number of keys, so it suffices
4869 to check that one is a subset of the other. */
4870 (void) hv_iterinit(hv);
4871 while ( (he = hv_iternext(hv)) ) {
4872 SV *key = hv_iterkeysv(he);
4874 DEBUG_M(Perl_deb(aTHX_ " comparing hash key...\n"));
4877 if(!hv_exists_ent(other_hv, key, 0)) {
4878 (void) hv_iterinit(hv); /* reset iterator */
4884 (void) hv_iterinit(other_hv);
4885 while ( hv_iternext(other_hv) )
4889 other_key_count = HvUSEDKEYS(other_hv);
4891 if (this_key_count != other_key_count)
4896 else if (SvROK(d) && SvTYPE(SvRV(d)) == SVt_PVAV) {
4897 AV * const other_av = MUTABLE_AV(SvRV(d));
4898 const SSize_t other_len = av_tindex(other_av) + 1;
4900 HV *hv = MUTABLE_HV(SvRV(e));
4902 DEBUG_M(Perl_deb(aTHX_ " applying rule Array-Hash\n"));
4903 for (i = 0; i < other_len; ++i) {
4904 SV ** const svp = av_fetch(other_av, i, FALSE);
4905 DEBUG_M(Perl_deb(aTHX_ " checking for key existence...\n"));
4906 if (svp) { /* ??? When can this not happen? */
4907 if (hv_exists_ent(hv, *svp, 0))
4913 else if (SvROK(d) && SvTYPE(SvRV(d)) == SVt_REGEXP) {
4914 DEBUG_M(Perl_deb(aTHX_ " applying rule Regex-Hash\n"));
4917 PMOP * const matcher = make_matcher((REGEXP*) SvRV(d));
4919 HV *hv = MUTABLE_HV(SvRV(e));
4921 (void) hv_iterinit(hv);
4922 while ( (he = hv_iternext(hv)) ) {
4923 DEBUG_M(Perl_deb(aTHX_ " testing key against pattern...\n"));
4925 if (matcher_matches_sv(matcher, hv_iterkeysv(he))) {
4927 (void) hv_iterinit(hv);
4928 destroy_matcher(matcher);
4933 destroy_matcher(matcher);
4939 DEBUG_M(Perl_deb(aTHX_ " applying rule Any-Hash\n"));
4940 if (hv_exists_ent(MUTABLE_HV(SvRV(e)), d, 0))
4947 else if (SvROK(e) && SvTYPE(SvRV(e)) == SVt_PVAV) {
4948 if (object_on_left) {
4949 goto sm_any_array; /* Treat objects like scalars */
4951 else if (SvROK(d) && SvTYPE(SvRV(d)) == SVt_PVHV) {
4952 AV * const other_av = MUTABLE_AV(SvRV(e));
4953 const SSize_t other_len = av_tindex(other_av) + 1;
4956 DEBUG_M(Perl_deb(aTHX_ " applying rule Hash-Array\n"));
4957 for (i = 0; i < other_len; ++i) {
4958 SV ** const svp = av_fetch(other_av, i, FALSE);
4960 DEBUG_M(Perl_deb(aTHX_ " testing for key existence...\n"));
4961 if (svp) { /* ??? When can this not happen? */
4962 if (hv_exists_ent(MUTABLE_HV(SvRV(d)), *svp, 0))
4968 if (SvROK(d) && SvTYPE(SvRV(d)) == SVt_PVAV) {
4969 AV *other_av = MUTABLE_AV(SvRV(d));
4970 DEBUG_M(Perl_deb(aTHX_ " applying rule Array-Array\n"));
4971 if (av_tindex(MUTABLE_AV(SvRV(e))) != av_tindex(other_av))
4975 const SSize_t other_len = av_tindex(other_av);
4977 if (NULL == seen_this) {
4978 seen_this = newHV();
4979 (void) sv_2mortal(MUTABLE_SV(seen_this));
4981 if (NULL == seen_other) {
4982 seen_other = newHV();
4983 (void) sv_2mortal(MUTABLE_SV(seen_other));
4985 for(i = 0; i <= other_len; ++i) {
4986 SV * const * const this_elem = av_fetch(MUTABLE_AV(SvRV(e)), i, FALSE);
4987 SV * const * const other_elem = av_fetch(other_av, i, FALSE);
4989 if (!this_elem || !other_elem) {
4990 if ((this_elem && SvOK(*this_elem))
4991 || (other_elem && SvOK(*other_elem)))
4994 else if (hv_exists_ent(seen_this,
4995 sv_2mortal(newSViv(PTR2IV(*this_elem))), 0) ||
4996 hv_exists_ent(seen_other,
4997 sv_2mortal(newSViv(PTR2IV(*other_elem))), 0))
4999 if (*this_elem != *other_elem)
5003 (void)hv_store_ent(seen_this,
5004 sv_2mortal(newSViv(PTR2IV(*this_elem))),
5006 (void)hv_store_ent(seen_other,
5007 sv_2mortal(newSViv(PTR2IV(*other_elem))),
5013 DEBUG_M(Perl_deb(aTHX_ " recursively comparing array element...\n"));
5014 (void) do_smartmatch(seen_this, seen_other, 0);
5016 DEBUG_M(Perl_deb(aTHX_ " recursion finished\n"));
5025 else if (SvROK(d) && SvTYPE(SvRV(d)) == SVt_REGEXP) {
5026 DEBUG_M(Perl_deb(aTHX_ " applying rule Regex-Array\n"));
5029 PMOP * const matcher = make_matcher((REGEXP*) SvRV(d));
5030 const SSize_t this_len = av_tindex(MUTABLE_AV(SvRV(e)));
5033 for(i = 0; i <= this_len; ++i) {
5034 SV * const * const svp = av_fetch(MUTABLE_AV(SvRV(e)), i, FALSE);
5035 DEBUG_M(Perl_deb(aTHX_ " testing element against pattern...\n"));
5037 if (svp && matcher_matches_sv(matcher, *svp)) {
5039 destroy_matcher(matcher);
5044 destroy_matcher(matcher);
5048 else if (!SvOK(d)) {
5049 /* undef ~~ array */
5050 const SSize_t this_len = av_tindex(MUTABLE_AV(SvRV(e)));
5053 DEBUG_M(Perl_deb(aTHX_ " applying rule Undef-Array\n"));
5054 for (i = 0; i <= this_len; ++i) {
5055 SV * const * const svp = av_fetch(MUTABLE_AV(SvRV(e)), i, FALSE);
5056 DEBUG_M(Perl_deb(aTHX_ " testing for undef element...\n"));
5057 if (!svp || !SvOK(*svp))
5066 const SSize_t this_len = av_tindex(MUTABLE_AV(SvRV(e)));
5068 DEBUG_M(Perl_deb(aTHX_ " applying rule Any-Array\n"));
5069 for (i = 0; i <= this_len; ++i) {
5070 SV * const * const svp = av_fetch(MUTABLE_AV(SvRV(e)), i, FALSE);
5077 /* infinite recursion isn't supposed to happen here */
5078 DEBUG_M(Perl_deb(aTHX_ " recursively testing array element...\n"));
5079 (void) do_smartmatch(NULL, NULL, 1);
5081 DEBUG_M(Perl_deb(aTHX_ " recursion finished\n"));
5090 else if (SvROK(e) && SvTYPE(SvRV(e)) == SVt_REGEXP) {
5091 if (!object_on_left && SvROK(d) && SvTYPE(SvRV(d)) == SVt_PVHV) {
5092 SV *t = d; d = e; e = t;
5093 DEBUG_M(Perl_deb(aTHX_ " applying rule Hash-Regex\n"));
5096 else if (!object_on_left && SvROK(d) && SvTYPE(SvRV(d)) == SVt_PVAV) {
5097 SV *t = d; d = e; e = t;
5098 DEBUG_M(Perl_deb(aTHX_ " applying rule Array-Regex\n"));
5099 goto sm_regex_array;
5102 PMOP * const matcher = make_matcher((REGEXP*) SvRV(e));
5105 DEBUG_M(Perl_deb(aTHX_ " applying rule Any-Regex\n"));
5107 result = matcher_matches_sv(matcher, d);
5109 PUSHs(result ? &PL_sv_yes : &PL_sv_no);
5110 destroy_matcher(matcher);
5115 /* See if there is overload magic on left */
5116 else if (object_on_left && SvAMAGIC(d)) {
5118 DEBUG_M(Perl_deb(aTHX_ " applying rule Object-Any\n"));
5119 DEBUG_M(Perl_deb(aTHX_ " attempting overload\n"));
5122 tmpsv = amagic_call(d, e, smart_amg, AMGf_noright);
5130 DEBUG_M(Perl_deb(aTHX_ " failed to run overload method; falling back...\n"));
5133 else if (!SvOK(d)) {
5134 /* undef ~~ scalar ; we already know that the scalar is SvOK */
5135 DEBUG_M(Perl_deb(aTHX_ " applying rule undef-Any\n"));
5140 if (SvNIOK(e) || (SvPOK(e) && looks_like_number(e) && SvNIOK(d))) {
5141 DEBUG_M(if (SvNIOK(e))
5142 Perl_deb(aTHX_ " applying rule Any-Num\n");
5144 Perl_deb(aTHX_ " applying rule Num-numish\n");
5146 /* numeric comparison */
5149 if (CopHINTS_get(PL_curcop) & HINT_INTEGER)
5150 (void) Perl_pp_i_eq(aTHX);
5152 (void) Perl_pp_eq(aTHX);
5160 /* As a last resort, use string comparison */
5161 DEBUG_M(Perl_deb(aTHX_ " applying rule Any-Any\n"));
5164 return Perl_pp_seq(aTHX);
5171 const U8 gimme = GIMME_V;
5173 /* This is essentially an optimization: if the match
5174 fails, we don't want to push a context and then
5175 pop it again right away, so we skip straight
5176 to the op that follows the leavewhen.
5177 RETURNOP calls PUTBACK which restores the stack pointer after the POPs.
5179 if (!(PL_op->op_flags & OPf_SPECIAL) && !SvTRUEx(POPs))
5180 RETURNOP(cLOGOP->op_other->op_next);
5182 cx = cx_pushblock(CXt_WHEN, gimme, SP, PL_savestack_ix);
5196 assert(CxTYPE(cx) == CXt_WHEN);
5197 gimme = cx->blk_gimme;
5199 cxix = dopoptogivenfor(cxstack_ix);
5201 /* diag_listed_as: Can't "when" outside a topicalizer */
5202 DIE(aTHX_ "Can't \"%s\" outside a topicalizer",
5203 PL_op->op_flags & OPf_SPECIAL ? "default" : "when");
5205 oldsp = PL_stack_base + cx->blk_oldsp;
5206 if (gimme == G_VOID)
5207 PL_stack_sp = oldsp;
5209 leave_adjust_stacks(oldsp, oldsp, gimme, 1);
5211 /* pop the WHEN, BLOCK and anything else before the GIVEN/FOR */
5212 assert(cxix < cxstack_ix);
5215 cx = &cxstack[cxix];
5217 if (CxFOREACH(cx)) {
5218 /* emulate pp_next. Note that any stack(s) cleanup will be
5219 * done by the pp_unstack which op_nextop should point to */
5222 PL_curcop = cx->blk_oldcop;
5223 return cx->blk_loop.my_op->op_nextop;
5227 assert(cx->blk_givwhen.leave_op->op_type == OP_LEAVEGIVEN);
5228 return cx->blk_givwhen.leave_op;
5238 cxix = dopoptowhen(cxstack_ix);
5240 DIE(aTHX_ "Can't \"continue\" outside a when block");
5242 if (cxix < cxstack_ix)
5246 assert(CxTYPE(cx) == CXt_WHEN);
5247 PL_stack_sp = PL_stack_base + cx->blk_oldsp;
5251 nextop = cx->blk_givwhen.leave_op->op_next;
5262 cxix = dopoptogivenfor(cxstack_ix);
5264 DIE(aTHX_ "Can't \"break\" outside a given block");
5266 cx = &cxstack[cxix];
5268 DIE(aTHX_ "Can't \"break\" in a loop topicalizer");
5270 if (cxix < cxstack_ix)
5273 /* Restore the sp at the time we entered the given block */
5275 PL_stack_sp = PL_stack_base + cx->blk_oldsp;
5277 return cx->blk_givwhen.leave_op;
5281 S_doparseform(pTHX_ SV *sv)
5284 char *s = SvPV(sv, len);
5286 char *base = NULL; /* start of current field */
5287 I32 skipspaces = 0; /* number of contiguous spaces seen */
5288 bool noblank = FALSE; /* ~ or ~~ seen on this line */
5289 bool repeat = FALSE; /* ~~ seen on this line */
5290 bool postspace = FALSE; /* a text field may need right padding */
5293 U32 *linepc = NULL; /* position of last FF_LINEMARK */
5295 bool ischop; /* it's a ^ rather than a @ */
5296 bool unchopnum = FALSE; /* at least one @ (i.e. non-chop) num field seen */
5297 int maxops = 12; /* FF_LINEMARK + FF_END + 10 (\0 without preceding \n) */
5301 PERL_ARGS_ASSERT_DOPARSEFORM;
5304 Perl_croak(aTHX_ "Null picture in formline");
5306 if (SvTYPE(sv) >= SVt_PVMG) {
5307 /* This might, of course, still return NULL. */
5308 mg = mg_find(sv, PERL_MAGIC_fm);
5310 sv_upgrade(sv, SVt_PVMG);
5314 /* still the same as previously-compiled string? */
5315 SV *old = mg->mg_obj;
5316 if ( !(!!SvUTF8(old) ^ !!SvUTF8(sv))
5317 && len == SvCUR(old)
5318 && strnEQ(SvPVX(old), s, len)
5320 DEBUG_f(PerlIO_printf(Perl_debug_log,"Re-using compiled format\n"));
5324 DEBUG_f(PerlIO_printf(Perl_debug_log, "Re-compiling format\n"));
5325 Safefree(mg->mg_ptr);
5331 DEBUG_f(PerlIO_printf(Perl_debug_log, "Compiling format\n"));
5332 mg = sv_magicext(sv, NULL, PERL_MAGIC_fm, &PL_vtbl_fm, NULL, 0);
5335 sv_copy = newSVpvn_utf8(s, len, SvUTF8(sv));
5336 s = SvPV(sv_copy, len); /* work on the copy, not the original */
5340 /* estimate the buffer size needed */
5341 for (base = s; s <= send; s++) {
5342 if (*s == '\n' || *s == '@' || *s == '^')
5348 Newx(fops, maxops, U32);
5353 *fpc++ = FF_LINEMARK;
5354 noblank = repeat = FALSE;
5372 case ' ': case '\t':
5388 *fpc++ = FF_LITERAL;
5396 *fpc++ = (U32)skipspaces;
5400 *fpc++ = FF_NEWLINE;
5404 arg = fpc - linepc + 1;
5411 *fpc++ = FF_LINEMARK;
5412 noblank = repeat = FALSE;
5421 ischop = s[-1] == '^';
5427 arg = (s - base) - 1;
5429 *fpc++ = FF_LITERAL;
5435 if (*s == '*') { /* @* or ^* */
5437 *fpc++ = 2; /* skip the @* or ^* */
5439 *fpc++ = FF_LINESNGL;
5442 *fpc++ = FF_LINEGLOB;
5444 else if (*s == '#' || (*s == '.' && s[1] == '#')) { /* @###, ^### */
5445 arg = ischop ? FORM_NUM_BLANK : 0;
5450 const char * const f = ++s;
5453 arg |= FORM_NUM_POINT + (s - f);
5455 *fpc++ = s - base; /* fieldsize for FETCH */
5456 *fpc++ = FF_DECIMAL;
5458 unchopnum |= ! ischop;
5460 else if (*s == '0' && s[1] == '#') { /* Zero padded decimals */
5461 arg = ischop ? FORM_NUM_BLANK : 0;
5463 s++; /* skip the '0' first */
5467 const char * const f = ++s;
5470 arg |= FORM_NUM_POINT + (s - f);
5472 *fpc++ = s - base; /* fieldsize for FETCH */
5473 *fpc++ = FF_0DECIMAL;
5475 unchopnum |= ! ischop;
5477 else { /* text field */
5479 bool ismore = FALSE;
5482 while (*++s == '>') ;
5483 prespace = FF_SPACE;
5485 else if (*s == '|') {
5486 while (*++s == '|') ;
5487 prespace = FF_HALFSPACE;
5492 while (*++s == '<') ;
5495 if (*s == '.' && s[1] == '.' && s[2] == '.') {
5499 *fpc++ = s - base; /* fieldsize for FETCH */
5501 *fpc++ = ischop ? FF_CHECKCHOP : FF_CHECKNL;
5504 *fpc++ = (U32)prespace; /* add SPACE or HALFSPACE */
5518 assert (fpc <= fops + maxops); /* ensure our buffer estimate was valid */
5521 mg->mg_ptr = (char *) fops;
5522 mg->mg_len = arg * sizeof(U32);
5523 mg->mg_obj = sv_copy;
5524 mg->mg_flags |= MGf_REFCOUNTED;
5526 if (unchopnum && repeat)
5527 Perl_die(aTHX_ "Repeated format line will never terminate (~~ and @#)");
5534 S_num_overflow(NV value, I32 fldsize, I32 frcsize)
5536 /* Can value be printed in fldsize chars, using %*.*f ? */
5540 int intsize = fldsize - (value < 0 ? 1 : 0);
5542 if (frcsize & FORM_NUM_POINT)
5544 frcsize &= ~(FORM_NUM_POINT|FORM_NUM_BLANK);
5547 while (intsize--) pwr *= 10.0;
5548 while (frcsize--) eps /= 10.0;
5551 if (value + eps >= pwr)
5554 if (value - eps <= -pwr)
5561 S_run_user_filter(pTHX_ int idx, SV *buf_sv, int maxlen)
5563 SV * const datasv = FILTER_DATA(idx);
5564 const int filter_has_file = IoLINES(datasv);
5565 SV * const filter_state = MUTABLE_SV(IoTOP_GV(datasv));
5566 SV * const filter_sub = MUTABLE_SV(IoBOTTOM_GV(datasv));
5571 char *prune_from = NULL;
5572 bool read_from_cache = FALSE;
5576 PERL_ARGS_ASSERT_RUN_USER_FILTER;
5578 assert(maxlen >= 0);
5581 /* I was having segfault trouble under Linux 2.2.5 after a
5582 parse error occurred. (Had to hack around it with a test
5583 for PL_parser->error_count == 0.) Solaris doesn't segfault --
5584 not sure where the trouble is yet. XXX */
5587 SV *const cache = datasv;
5590 const char *cache_p = SvPV(cache, cache_len);
5594 /* Running in block mode and we have some cached data already.
5596 if (cache_len >= umaxlen) {
5597 /* In fact, so much data we don't even need to call
5602 const char *const first_nl =
5603 (const char *)memchr(cache_p, '\n', cache_len);
5605 take = first_nl + 1 - cache_p;
5609 sv_catpvn(buf_sv, cache_p, take);
5610 sv_chop(cache, cache_p + take);
5611 /* Definitely not EOF */
5615 sv_catsv(buf_sv, cache);
5617 umaxlen -= cache_len;
5620 read_from_cache = TRUE;
5624 /* Filter API says that the filter appends to the contents of the buffer.
5625 Usually the buffer is "", so the details don't matter. But if it's not,
5626 then clearly what it contains is already filtered by this filter, so we
5627 don't want to pass it in a second time.
5628 I'm going to use a mortal in case the upstream filter croaks. */
5629 upstream = ((SvOK(buf_sv) && sv_len(buf_sv)) || SvGMAGICAL(buf_sv))
5630 ? sv_newmortal() : buf_sv;
5631 SvUPGRADE(upstream, SVt_PV);
5633 if (filter_has_file) {
5634 status = FILTER_READ(idx+1, upstream, 0);
5637 if (filter_sub && status >= 0) {
5641 ENTER_with_name("call_filter_sub");
5646 DEFSV_set(upstream);
5650 PUSHs(filter_state);
5653 count = call_sv(filter_sub, G_SCALAR|G_EVAL);
5663 SV * const errsv = ERRSV;
5664 if (SvTRUE_NN(errsv))
5665 err = newSVsv(errsv);
5671 LEAVE_with_name("call_filter_sub");
5674 if (SvGMAGICAL(upstream)) {
5676 if (upstream == buf_sv) mg_free(buf_sv);
5678 if (SvIsCOW(upstream)) sv_force_normal(upstream);
5679 if(!err && SvOK(upstream)) {
5680 got_p = SvPV_nomg(upstream, got_len);
5682 if (got_len > umaxlen) {
5683 prune_from = got_p + umaxlen;
5686 char *const first_nl = (char *)memchr(got_p, '\n', got_len);
5687 if (first_nl && first_nl + 1 < got_p + got_len) {
5688 /* There's a second line here... */
5689 prune_from = first_nl + 1;
5693 if (!err && prune_from) {
5694 /* Oh. Too long. Stuff some in our cache. */
5695 STRLEN cached_len = got_p + got_len - prune_from;
5696 SV *const cache = datasv;
5699 /* Cache should be empty. */
5700 assert(!SvCUR(cache));
5703 sv_setpvn(cache, prune_from, cached_len);
5704 /* If you ask for block mode, you may well split UTF-8 characters.
5705 "If it breaks, you get to keep both parts"
5706 (Your code is broken if you don't put them back together again
5707 before something notices.) */
5708 if (SvUTF8(upstream)) {
5711 if (SvPOK(upstream)) SvCUR_set(upstream, got_len - cached_len);
5713 /* Cannot just use sv_setpvn, as that could free the buffer
5714 before we have a chance to assign it. */
5715 sv_usepvn(upstream, savepvn(got_p, got_len - cached_len),
5716 got_len - cached_len);
5718 /* Can't yet be EOF */
5723 /* If they are at EOF but buf_sv has something in it, then they may never
5724 have touched the SV upstream, so it may be undefined. If we naively
5725 concatenate it then we get a warning about use of uninitialised value.
5727 if (!err && upstream != buf_sv &&
5729 sv_catsv_nomg(buf_sv, upstream);
5731 else if (SvOK(upstream)) (void)SvPV_force_nolen(buf_sv);
5734 IoLINES(datasv) = 0;
5736 SvREFCNT_dec(filter_state);
5737 IoTOP_GV(datasv) = NULL;
5740 SvREFCNT_dec(filter_sub);
5741 IoBOTTOM_GV(datasv) = NULL;
5743 filter_del(S_run_user_filter);
5749 if (status == 0 && read_from_cache) {
5750 /* If we read some data from the cache (and by getting here it implies
5751 that we emptied the cache) then we aren't yet at EOF, and mustn't
5752 report that to our caller. */
5759 * ex: set ts=8 sts=4 sw=4 et: