3 * Copyright (c) 1991-1997, Larry Wall
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
11 * Now far ahead the Road has gone,
12 * And I must follow, if I can,
13 * Pursuing it with eager feet,
14 * Until it joins some larger way
15 * Where many paths and errands meet.
16 * And whither then? I cannot say.
23 #define WORD_ALIGN sizeof(U16)
26 #define DOCATCH(o) ((CATCH_GET == TRUE) ? docatch(o) : (o))
29 #define CALLOP this->*PL_op
32 static OP *docatch _((OP *o));
33 static OP *dofindlabel _((OP *o, char *label, OP **opstack, OP **oplimit));
34 static void doparseform _((SV *sv));
35 static I32 dopoptoeval _((I32 startingblock));
36 static I32 dopoptolabel _((char *label));
37 static I32 dopoptoloop _((I32 startingblock));
38 static I32 dopoptosub _((I32 startingblock));
39 static I32 dopoptosub_at _((PERL_CONTEXT *cxstk, I32 startingblock));
40 static void save_lines _((AV *array, SV *sv));
41 static I32 sortcv _((SV *a, SV *b));
42 static void qsortsv _((SV **array, size_t num_elts, I32 (*fun)(SV *a, SV *b)));
43 static OP *doeval _((int gimme, OP** startop));
52 cxix = dopoptosub(cxstack_ix);
56 switch (cxstack[cxix].blk_gimme) {
73 /* XXXX Should store the old value to allow for tie/overload - and
74 restore in regcomp, where marked with XXXX. */
82 register PMOP *pm = (PMOP*)cLOGOP->op_other;
86 MAGIC *mg = Null(MAGIC*);
90 SV *sv = SvRV(tmpstr);
92 mg = mg_find(sv, 'r');
95 regexp *re = (regexp *)mg->mg_obj;
96 ReREFCNT_dec(pm->op_pmregexp);
97 pm->op_pmregexp = ReREFCNT_inc(re);
100 t = SvPV(tmpstr, len);
102 /* Check against the last compiled regexp. */
103 if (!pm->op_pmregexp || !pm->op_pmregexp->precomp ||
104 pm->op_pmregexp->prelen != len ||
105 memNE(pm->op_pmregexp->precomp, t, len))
107 if (pm->op_pmregexp) {
108 ReREFCNT_dec(pm->op_pmregexp);
109 pm->op_pmregexp = Null(REGEXP*); /* crucial if regcomp aborts */
111 if (PL_op->op_flags & OPf_SPECIAL)
112 PL_reginterp_cnt = I32_MAX; /* Mark as safe. */
114 pm->op_pmflags = pm->op_pmpermflags; /* reset case sensitivity */
115 pm->op_pmregexp = CALLREGCOMP(t, t + len, pm);
116 PL_reginterp_cnt = 0; /* XXXX Be extra paranoid - needed
117 inside tie/overload accessors. */
121 #ifndef INCOMPLETE_TAINTS
124 pm->op_pmdynflags |= PMdf_TAINTED;
126 pm->op_pmdynflags &= ~PMdf_TAINTED;
130 if (!pm->op_pmregexp->prelen && PL_curpm)
132 else if (strEQ("\\s+", pm->op_pmregexp->precomp))
133 pm->op_pmflags |= PMf_WHITE;
135 if (pm->op_pmflags & PMf_KEEP) {
136 pm->op_private &= ~OPpRUNTIME; /* no point compiling again */
137 cLOGOP->op_first->op_next = PL_op->op_next;
145 register PMOP *pm = (PMOP*) cLOGOP->op_other;
146 register PERL_CONTEXT *cx = &cxstack[cxstack_ix];
147 register SV *dstr = cx->sb_dstr;
148 register char *s = cx->sb_s;
149 register char *m = cx->sb_m;
150 char *orig = cx->sb_orig;
151 register REGEXP *rx = cx->sb_rx;
153 rxres_restore(&cx->sb_rxres, rx);
155 if (cx->sb_iters++) {
156 if (cx->sb_iters > cx->sb_maxiters)
157 DIE("Substitution loop");
159 if (!(cx->sb_rxtainted & 2) && SvTAINTED(TOPs))
160 cx->sb_rxtainted |= 2;
161 sv_catsv(dstr, POPs);
164 if (cx->sb_once || !CALLREGEXEC(rx, s, cx->sb_strend, orig,
165 s == m, Nullsv, NULL,
166 cx->sb_safebase ? 0 : REXEC_COPY_STR))
168 SV *targ = cx->sb_targ;
169 sv_catpvn(dstr, s, cx->sb_strend - s);
171 cx->sb_rxtainted |= RX_MATCH_TAINTED(rx);
173 (void)SvOOK_off(targ);
174 Safefree(SvPVX(targ));
175 SvPVX(targ) = SvPVX(dstr);
176 SvCUR_set(targ, SvCUR(dstr));
177 SvLEN_set(targ, SvLEN(dstr));
181 TAINT_IF(cx->sb_rxtainted & 1);
182 PUSHs(sv_2mortal(newSViv((I32)cx->sb_iters - 1)));
184 (void)SvPOK_only(targ);
185 TAINT_IF(cx->sb_rxtainted);
189 LEAVE_SCOPE(cx->sb_oldsave);
191 RETURNOP(pm->op_next);
194 if (rx->subbase && rx->subbase != orig) {
197 cx->sb_orig = orig = rx->subbase;
199 cx->sb_strend = s + (cx->sb_strend - m);
201 cx->sb_m = m = rx->startp[0];
202 sv_catpvn(dstr, s, m-s);
203 cx->sb_s = rx->endp[0];
204 cx->sb_rxtainted |= RX_MATCH_TAINTED(rx);
205 rxres_save(&cx->sb_rxres, rx);
206 RETURNOP(pm->op_pmreplstart);
210 rxres_save(void **rsp, REGEXP *rx)
215 if (!p || p[1] < rx->nparens) {
216 i = 6 + rx->nparens * 2;
224 *p++ = (UV)rx->subbase;
225 rx->subbase = Nullch;
229 *p++ = (UV)rx->subbeg;
230 *p++ = (UV)rx->subend;
231 for (i = 0; i <= rx->nparens; ++i) {
232 *p++ = (UV)rx->startp[i];
233 *p++ = (UV)rx->endp[i];
238 rxres_restore(void **rsp, REGEXP *rx)
243 Safefree(rx->subbase);
244 rx->subbase = (char*)(*p);
249 rx->subbeg = (char*)(*p++);
250 rx->subend = (char*)(*p++);
251 for (i = 0; i <= rx->nparens; ++i) {
252 rx->startp[i] = (char*)(*p++);
253 rx->endp[i] = (char*)(*p++);
258 rxres_free(void **rsp)
263 Safefree((char*)(*p));
271 djSP; dMARK; dORIGMARK;
272 register SV *tmpForm = *++MARK;
284 bool chopspace = (strchr(PL_chopset, ' ') != Nullch);
290 STRLEN fudge = SvCUR(tmpForm) * (IN_UTF8 ? 3 : 1) + 1;
292 if (!SvMAGICAL(tmpForm) || !SvCOMPILED(tmpForm)) {
293 SvREADONLY_off(tmpForm);
294 doparseform(tmpForm);
297 SvPV_force(PL_formtarget, len);
298 t = SvGROW(PL_formtarget, len + fudge + 1); /* XXX SvCUR bad */
300 f = SvPV(tmpForm, len);
301 /* need to jump to the next word */
302 s = f + len + WORD_ALIGN - SvCUR(tmpForm) % WORD_ALIGN;
311 case FF_LITERAL: arg = fpc[1]; name = "LITERAL"; break;
312 case FF_BLANK: arg = fpc[1]; name = "BLANK"; break;
313 case FF_SKIP: arg = fpc[1]; name = "SKIP"; break;
314 case FF_FETCH: arg = fpc[1]; name = "FETCH"; break;
315 case FF_DECIMAL: arg = fpc[1]; name = "DECIMAL"; break;
317 case FF_CHECKNL: name = "CHECKNL"; break;
318 case FF_CHECKCHOP: name = "CHECKCHOP"; break;
319 case FF_SPACE: name = "SPACE"; break;
320 case FF_HALFSPACE: name = "HALFSPACE"; break;
321 case FF_ITEM: name = "ITEM"; break;
322 case FF_CHOP: name = "CHOP"; break;
323 case FF_LINEGLOB: name = "LINEGLOB"; break;
324 case FF_NEWLINE: name = "NEWLINE"; break;
325 case FF_MORE: name = "MORE"; break;
326 case FF_LINEMARK: name = "LINEMARK"; break;
327 case FF_END: name = "END"; break;
330 PerlIO_printf(PerlIO_stderr(), "%-16s%ld\n", name, (long) arg);
332 PerlIO_printf(PerlIO_stderr(), "%-16s\n", name);
360 if (ckWARN(WARN_SYNTAX))
361 warner(WARN_SYNTAX, "Not enough format arguments");
366 item = s = SvPV(sv, len);
369 itemsize = sv_len_utf8(sv);
370 if (itemsize != len) {
372 if (itemsize > fieldsize) {
373 itemsize = fieldsize;
374 itembytes = itemsize;
375 sv_pos_u2b(sv, &itembytes, 0);
379 send = chophere = s + itembytes;
388 sv_pos_b2u(sv, &itemsize);
392 if (itemsize > fieldsize)
393 itemsize = fieldsize;
394 send = chophere = s + itemsize;
406 item = s = SvPV(sv, len);
409 itemsize = sv_len_utf8(sv);
410 if (itemsize != len) {
412 if (itemsize <= fieldsize) {
413 send = chophere = s + itemsize;
424 itemsize = fieldsize;
425 itembytes = itemsize;
426 sv_pos_u2b(sv, &itembytes, 0);
427 send = chophere = s + itembytes;
428 while (s < send || (s == send && isSPACE(*s))) {
438 if (strchr(PL_chopset, *s))
443 itemsize = chophere - item;
444 sv_pos_b2u(sv, &itemsize);
449 if (itemsize <= fieldsize) {
450 send = chophere = s + itemsize;
461 itemsize = fieldsize;
462 send = chophere = s + itemsize;
463 while (s < send || (s == send && isSPACE(*s))) {
473 if (strchr(PL_chopset, *s))
478 itemsize = chophere - item;
483 arg = fieldsize - itemsize;
492 arg = fieldsize - itemsize;
507 switch (UTF8SKIP(s)) {
518 if ( !((*t++ = *s++) & ~31) )
526 int ch = *t++ = *s++;
529 if ( !((*t++ = *s++) & ~31) )
538 while (*s && isSPACE(*s))
545 item = s = SvPV(sv, len);
558 SvCUR_set(PL_formtarget, t - SvPVX(PL_formtarget));
559 sv_catpvn(PL_formtarget, item, itemsize);
560 SvGROW(PL_formtarget, SvCUR(PL_formtarget) + fudge + 1);
561 t = SvPVX(PL_formtarget) + SvCUR(PL_formtarget);
566 /* If the field is marked with ^ and the value is undefined,
569 if ((arg & 512) && !SvOK(sv)) {
577 /* Formats aren't yet marked for locales, so assume "yes". */
580 sprintf(t, "%#*.*f", (int) fieldsize, (int) arg & 255, value);
582 sprintf(t, "%*.0f", (int) fieldsize, value);
589 while (t-- > linemark && *t == ' ') ;
597 if (arg) { /* repeat until fields exhausted? */
599 SvCUR_set(PL_formtarget, t - SvPVX(PL_formtarget));
600 lines += FmLINES(PL_formtarget);
603 if (strnEQ(linemark, linemark - arg, arg))
604 DIE("Runaway format");
606 FmLINES(PL_formtarget) = lines;
608 RETURNOP(cLISTOP->op_first);
619 arg = fieldsize - itemsize;
626 if (strnEQ(s," ",3)) {
627 while (s > SvPVX(PL_formtarget) && isSPACE(s[-1]))
638 SvCUR_set(PL_formtarget, t - SvPVX(PL_formtarget));
639 FmLINES(PL_formtarget) += lines;
651 if (PL_stack_base + *PL_markstack_ptr == SP) {
653 if (GIMME_V == G_SCALAR)
655 RETURNOP(PL_op->op_next->op_next);
657 PL_stack_sp = PL_stack_base + *PL_markstack_ptr + 1;
658 pp_pushmark(ARGS); /* push dst */
659 pp_pushmark(ARGS); /* push src */
660 ENTER; /* enter outer scope */
664 /* SAVE_DEFSV does *not* suffice here */
665 save_sptr(&THREADSV(0));
667 SAVESPTR(GvSV(PL_defgv));
668 #endif /* USE_THREADS */
669 ENTER; /* enter inner scope */
672 src = PL_stack_base[*PL_markstack_ptr];
677 if (PL_op->op_type == OP_MAPSTART)
678 pp_pushmark(ARGS); /* push top */
679 return ((LOGOP*)PL_op->op_next)->op_other;
684 DIE("panic: mapstart"); /* uses grepstart */
690 I32 diff = (SP - PL_stack_base) - *PL_markstack_ptr;
696 ++PL_markstack_ptr[-1];
698 if (diff > PL_markstack_ptr[-1] - PL_markstack_ptr[-2]) {
699 shift = diff - (PL_markstack_ptr[-1] - PL_markstack_ptr[-2]);
700 count = (SP - PL_stack_base) - PL_markstack_ptr[-1] + 2;
705 PL_markstack_ptr[-1] += shift;
706 *PL_markstack_ptr += shift;
710 dst = PL_stack_base + (PL_markstack_ptr[-2] += diff) - 1;
713 *dst-- = SvTEMP(TOPs) ? POPs : sv_mortalcopy(POPs);
715 LEAVE; /* exit inner scope */
718 if (PL_markstack_ptr[-1] > *PL_markstack_ptr) {
722 (void)POPMARK; /* pop top */
723 LEAVE; /* exit outer scope */
724 (void)POPMARK; /* pop src */
725 items = --*PL_markstack_ptr - PL_markstack_ptr[-1];
726 (void)POPMARK; /* pop dst */
727 SP = PL_stack_base + POPMARK; /* pop original mark */
728 if (gimme == G_SCALAR) {
732 else if (gimme == G_ARRAY)
739 ENTER; /* enter inner scope */
742 src = PL_stack_base[PL_markstack_ptr[-1]];
746 RETURNOP(cLOGOP->op_other);
752 djSP; dMARK; dORIGMARK;
754 SV **myorigmark = ORIGMARK;
760 OP* nextop = PL_op->op_next;
762 if (gimme != G_ARRAY) {
768 SAVEPPTR(PL_sortcop);
769 if (PL_op->op_flags & OPf_STACKED) {
770 if (PL_op->op_flags & OPf_SPECIAL) {
771 OP *kid = cLISTOP->op_first->op_sibling; /* pass pushmark */
772 kid = kUNOP->op_first; /* pass rv2gv */
773 kid = kUNOP->op_first; /* pass leave */
774 PL_sortcop = kid->op_next;
775 stash = PL_curcop->cop_stash;
778 cv = sv_2cv(*++MARK, &stash, &gv, 0);
779 if (!(cv && CvROOT(cv))) {
781 SV *tmpstr = sv_newmortal();
782 gv_efullname3(tmpstr, gv, Nullch);
783 if (cv && CvXSUB(cv))
784 DIE("Xsub \"%s\" called in sort", SvPVX(tmpstr));
785 DIE("Undefined sort subroutine \"%s\" called",
790 DIE("Xsub called in sort");
791 DIE("Undefined subroutine in sort");
793 DIE("Not a CODE reference in sort");
795 PL_sortcop = CvSTART(cv);
796 SAVESPTR(CvROOT(cv)->op_ppaddr);
797 CvROOT(cv)->op_ppaddr = ppaddr[OP_NULL];
800 PL_curpad = AvARRAY((AV*)AvARRAY(CvPADLIST(cv))[1]);
805 stash = PL_curcop->cop_stash;
809 while (MARK < SP) { /* This may or may not shift down one here. */
811 if (*up = *++MARK) { /* Weed out nulls. */
813 if (!PL_sortcop && !SvPOK(*up))
814 (void)sv_2pv(*up, &PL_na);
818 max = --up - myorigmark;
823 bool oldcatch = CATCH_GET;
829 PUSHSTACKi(PERLSI_SORT);
830 if (PL_sortstash != stash) {
831 PL_firstgv = gv_fetchpv("a", TRUE, SVt_PV);
832 PL_secondgv = gv_fetchpv("b", TRUE, SVt_PV);
833 PL_sortstash = stash;
836 SAVESPTR(GvSV(PL_firstgv));
837 SAVESPTR(GvSV(PL_secondgv));
839 PUSHBLOCK(cx, CXt_NULL, PL_stack_base);
840 if (!(PL_op->op_flags & OPf_SPECIAL)) {
841 bool hasargs = FALSE;
842 cx->cx_type = CXt_SUB;
843 cx->blk_gimme = G_SCALAR;
846 (void)SvREFCNT_inc(cv); /* in preparation for POPSUB */
848 PL_sortcxix = cxstack_ix;
849 qsortsv((myorigmark+1), max, FUNC_NAME_TO_PTR(sortcv));
851 POPBLOCK(cx,PL_curpm);
858 MEXTEND(SP, 20); /* Can't afford stack realloc on signal. */
859 qsortsv(ORIGMARK+1, max,
860 (PL_op->op_private & OPpLOCALE)
861 ? FUNC_NAME_TO_PTR(sv_cmp_locale)
862 : FUNC_NAME_TO_PTR(sv_cmp));
866 PL_stack_sp = ORIGMARK + max;
874 if (GIMME == G_ARRAY)
875 return cCONDOP->op_true;
876 return SvTRUEx(PAD_SV(PL_op->op_targ)) ? cCONDOP->op_false : cCONDOP->op_true;
883 if (GIMME == G_ARRAY) {
884 RETURNOP(((CONDOP*)cUNOP->op_first)->op_false);
888 SV *targ = PAD_SV(PL_op->op_targ);
890 if ((PL_op->op_private & OPpFLIP_LINENUM)
891 ? (PL_last_in_gv && SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv)))
893 sv_setiv(PAD_SV(cUNOP->op_first->op_targ), 1);
894 if (PL_op->op_flags & OPf_SPECIAL) {
902 RETURNOP(((CONDOP*)cUNOP->op_first)->op_false);
915 if (GIMME == G_ARRAY) {
921 if (SvNIOKp(left) || !SvPOKp(left) ||
922 (looks_like_number(left) && *SvPVX(left) != '0') )
924 if (SvNV(left) < IV_MIN || SvNV(right) >= IV_MAX)
925 croak("Range iterator outside integer range");
929 EXTEND_MORTAL(max - i + 1);
930 EXTEND(SP, max - i + 1);
933 sv = sv_2mortal(newSViv(i++));
938 SV *final = sv_mortalcopy(right);
940 char *tmps = SvPV(final, len);
942 sv = sv_mortalcopy(left);
943 SvPV_force(sv,PL_na);
944 while (!SvNIOKp(sv) && SvCUR(sv) <= len) {
946 if (strEQ(SvPVX(sv),tmps))
948 sv = sv_2mortal(newSVsv(sv));
955 SV *targ = PAD_SV(cUNOP->op_first->op_targ);
957 if ((PL_op->op_private & OPpFLIP_LINENUM)
958 ? (PL_last_in_gv && SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv)))
960 sv_setiv(PAD_SV(((UNOP*)cUNOP->op_first)->op_first->op_targ), 0);
961 sv_catpv(targ, "E0");
972 dopoptolabel(char *label)
976 register PERL_CONTEXT *cx;
978 for (i = cxstack_ix; i >= 0; i--) {
980 switch (cx->cx_type) {
982 if (ckWARN(WARN_UNSAFE))
983 warner(WARN_UNSAFE, "Exiting substitution via %s",
984 op_name[PL_op->op_type]);
987 if (ckWARN(WARN_UNSAFE))
988 warner(WARN_UNSAFE, "Exiting subroutine via %s",
989 op_name[PL_op->op_type]);
992 if (ckWARN(WARN_UNSAFE))
993 warner(WARN_UNSAFE, "Exiting eval via %s",
994 op_name[PL_op->op_type]);
997 if (ckWARN(WARN_UNSAFE))
998 warner(WARN_UNSAFE, "Exiting pseudo-block via %s",
999 op_name[PL_op->op_type]);
1002 if (!cx->blk_loop.label ||
1003 strNE(label, cx->blk_loop.label) ) {
1004 DEBUG_l(deb("(Skipping label #%ld %s)\n",
1005 (long)i, cx->blk_loop.label));
1008 DEBUG_l( deb("(Found label #%ld %s)\n", (long)i, label));
1018 I32 gimme = block_gimme();
1019 return (gimme == G_VOID) ? G_SCALAR : gimme;
1028 cxix = dopoptosub(cxstack_ix);
1032 switch (cxstack[cxix].blk_gimme) {
1040 croak("panic: bad gimme: %d\n", cxstack[cxix].blk_gimme);
1047 dopoptosub(I32 startingblock)
1050 return dopoptosub_at(cxstack, startingblock);
1054 dopoptosub_at(PERL_CONTEXT *cxstk, I32 startingblock)
1058 register PERL_CONTEXT *cx;
1059 for (i = startingblock; i >= 0; i--) {
1061 switch (cx->cx_type) {
1066 DEBUG_l( deb("(Found sub #%ld)\n", (long)i));
1074 dopoptoeval(I32 startingblock)
1078 register PERL_CONTEXT *cx;
1079 for (i = startingblock; i >= 0; i--) {
1081 switch (cx->cx_type) {
1085 DEBUG_l( deb("(Found eval #%ld)\n", (long)i));
1093 dopoptoloop(I32 startingblock)
1097 register PERL_CONTEXT *cx;
1098 for (i = startingblock; i >= 0; i--) {
1100 switch (cx->cx_type) {
1102 if (ckWARN(WARN_UNSAFE))
1103 warner(WARN_UNSAFE, "Exiting substitution via %s",
1104 op_name[PL_op->op_type]);
1107 if (ckWARN(WARN_UNSAFE))
1108 warner(WARN_UNSAFE, "Exiting subroutine via %s",
1109 op_name[PL_op->op_type]);
1112 if (ckWARN(WARN_UNSAFE))
1113 warner(WARN_UNSAFE, "Exiting eval via %s",
1114 op_name[PL_op->op_type]);
1117 if (ckWARN(WARN_UNSAFE))
1118 warner(WARN_UNSAFE, "Exiting pseudo-block via %s",
1119 op_name[PL_op->op_type]);
1122 DEBUG_l( deb("(Found loop #%ld)\n", (long)i));
1133 register PERL_CONTEXT *cx;
1137 while (cxstack_ix > cxix) {
1138 cx = &cxstack[cxstack_ix];
1139 DEBUG_l(PerlIO_printf(Perl_debug_log, "Unwinding block %ld, type %s\n",
1140 (long) cxstack_ix, block_type[cx->cx_type]));
1141 /* Note: we don't need to restore the base context info till the end. */
1142 switch (cx->cx_type) {
1145 continue; /* not break */
1163 die_where(char *message)
1168 register PERL_CONTEXT *cx;
1173 if (PL_in_eval & 4) {
1175 STRLEN klen = strlen(message);
1177 svp = hv_fetch(ERRHV, message, klen, TRUE);
1180 static char prefix[] = "\t(in cleanup) ";
1182 sv_upgrade(*svp, SVt_IV);
1183 (void)SvIOK_only(*svp);
1186 SvGROW(err, SvCUR(err)+sizeof(prefix)+klen);
1187 sv_catpvn(err, prefix, sizeof(prefix)-1);
1188 sv_catpvn(err, message, klen);
1194 sv_setpv(ERRSV, message);
1197 message = SvPVx(ERRSV, PL_na);
1199 while ((cxix = dopoptoeval(cxstack_ix)) < 0 && PL_curstackinfo->si_prev) {
1207 if (cxix < cxstack_ix)
1210 POPBLOCK(cx,PL_curpm);
1211 if (cx->cx_type != CXt_EVAL) {
1212 PerlIO_printf(PerlIO_stderr(), "panic: die %s", message);
1217 if (gimme == G_SCALAR)
1218 *++newsp = &PL_sv_undef;
1219 PL_stack_sp = newsp;
1223 if (optype == OP_REQUIRE) {
1224 char* msg = SvPVx(ERRSV, PL_na);
1225 DIE("%s", *msg ? msg : "Compilation failed in require");
1227 return pop_return();
1230 PerlIO_printf(PerlIO_stderr(), "%s",message);
1231 PerlIO_flush(PerlIO_stderr());
1240 if (SvTRUE(left) != SvTRUE(right))
1252 RETURNOP(cLOGOP->op_other);
1261 RETURNOP(cLOGOP->op_other);
1267 register I32 cxix = dopoptosub(cxstack_ix);
1268 register PERL_CONTEXT *cx;
1269 register PERL_CONTEXT *ccstack = cxstack;
1270 PERL_SI *top_si = PL_curstackinfo;
1281 /* we may be in a higher stacklevel, so dig down deeper */
1282 while (cxix < 0 && top_si->si_type != PERLSI_MAIN) {
1283 top_si = top_si->si_prev;
1284 ccstack = top_si->si_cxstack;
1285 cxix = dopoptosub_at(ccstack, top_si->si_cxix);
1288 if (GIMME != G_ARRAY)
1292 if (PL_DBsub && cxix >= 0 &&
1293 ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))
1297 cxix = dopoptosub_at(ccstack, cxix - 1);
1300 cx = &ccstack[cxix];
1301 if (ccstack[cxix].cx_type == CXt_SUB) {
1302 dbcxix = dopoptosub_at(ccstack, cxix - 1);
1303 /* We expect that ccstack[dbcxix] is CXt_SUB, anyway, the
1304 field below is defined for any cx. */
1305 if (PL_DBsub && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub))
1306 cx = &ccstack[dbcxix];
1309 if (GIMME != G_ARRAY) {
1310 hv = cx->blk_oldcop->cop_stash;
1312 PUSHs(&PL_sv_undef);
1315 sv_setpv(TARG, HvNAME(hv));
1321 hv = cx->blk_oldcop->cop_stash;
1323 PUSHs(&PL_sv_undef);
1325 PUSHs(sv_2mortal(newSVpv(HvNAME(hv), 0)));
1326 PUSHs(sv_2mortal(newSVpv(SvPVX(GvSV(cx->blk_oldcop->cop_filegv)), 0)));
1327 PUSHs(sv_2mortal(newSViv((I32)cx->blk_oldcop->cop_line)));
1330 if (cx->cx_type == CXt_SUB) { /* So is ccstack[dbcxix]. */
1332 gv_efullname3(sv, CvGV(ccstack[cxix].blk_sub.cv), Nullch);
1333 PUSHs(sv_2mortal(sv));
1334 PUSHs(sv_2mortal(newSViv((I32)cx->blk_sub.hasargs)));
1337 PUSHs(sv_2mortal(newSVpv("(eval)",0)));
1338 PUSHs(sv_2mortal(newSViv(0)));
1340 gimme = (I32)cx->blk_gimme;
1341 if (gimme == G_VOID)
1342 PUSHs(&PL_sv_undef);
1344 PUSHs(sv_2mortal(newSViv(gimme & G_ARRAY)));
1345 if (cx->cx_type == CXt_EVAL) {
1346 if (cx->blk_eval.old_op_type == OP_ENTEREVAL) {
1347 PUSHs(cx->blk_eval.cur_text);
1350 else if (cx->blk_eval.old_name) { /* Try blocks have old_name == 0. */
1351 /* Require, put the name. */
1352 PUSHs(sv_2mortal(newSVpv(cx->blk_eval.old_name, 0)));
1356 else if (cx->cx_type == CXt_SUB &&
1357 cx->blk_sub.hasargs &&
1358 PL_curcop->cop_stash == PL_debstash)
1360 AV *ary = cx->blk_sub.argarray;
1361 int off = AvARRAY(ary) - AvALLOC(ary);
1365 PL_dbargs = GvAV(gv_AVadd(tmpgv = gv_fetchpv("DB::args", TRUE,
1368 AvREAL_off(PL_dbargs); /* XXX Should be REIFY */
1371 if (AvMAX(PL_dbargs) < AvFILLp(ary) + off)
1372 av_extend(PL_dbargs, AvFILLp(ary) + off);
1373 Copy(AvALLOC(ary), AvARRAY(PL_dbargs), AvFILLp(ary) + 1 + off, SV*);
1374 AvFILLp(PL_dbargs) = AvFILLp(ary) + off;
1380 sortcv(SV *a, SV *b)
1383 I32 oldsaveix = PL_savestack_ix;
1384 I32 oldscopeix = PL_scopestack_ix;
1386 GvSV(PL_firstgv) = a;
1387 GvSV(PL_secondgv) = b;
1388 PL_stack_sp = PL_stack_base;
1391 if (PL_stack_sp != PL_stack_base + 1)
1392 croak("Sort subroutine didn't return single value");
1393 if (!SvNIOKp(*PL_stack_sp))
1394 croak("Sort subroutine didn't return a numeric value");
1395 result = SvIV(*PL_stack_sp);
1396 while (PL_scopestack_ix > oldscopeix) {
1399 leave_scope(oldsaveix);
1412 sv_reset(tmps, PL_curcop->cop_stash);
1424 PL_curcop = (COP*)PL_op;
1425 TAINT_NOT; /* Each statement is presumed innocent */
1426 PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
1429 if (PL_op->op_private || SvIV(PL_DBsingle) || SvIV(PL_DBsignal) || SvIV(PL_DBtrace))
1433 register PERL_CONTEXT *cx;
1434 I32 gimme = G_ARRAY;
1441 DIE("No DB::DB routine defined");
1443 if (CvDEPTH(cv) >= 1 && !(PL_debug & (1<<30))) /* don't do recursive DB::DB call */
1455 push_return(PL_op->op_next);
1456 PUSHBLOCK(cx, CXt_SUB, SP);
1459 (void)SvREFCNT_inc(cv);
1460 SAVESPTR(PL_curpad);
1461 PL_curpad = AvARRAY((AV*)*av_fetch(CvPADLIST(cv),1,FALSE));
1462 RETURNOP(CvSTART(cv));
1476 register PERL_CONTEXT *cx;
1477 I32 gimme = GIMME_V;
1484 if (PL_op->op_flags & OPf_SPECIAL)
1485 svp = save_threadsv(PL_op->op_targ); /* per-thread variable */
1487 #endif /* USE_THREADS */
1488 if (PL_op->op_targ) {
1489 svp = &PL_curpad[PL_op->op_targ]; /* "my" variable */
1494 (void)save_scalar(gv);
1495 svp = &GvSV(gv); /* symbol table variable */
1500 PUSHBLOCK(cx, CXt_LOOP, SP);
1501 PUSHLOOP(cx, svp, MARK);
1502 if (PL_op->op_flags & OPf_STACKED) {
1503 cx->blk_loop.iterary = (AV*)SvREFCNT_inc(POPs);
1504 if (SvTYPE(cx->blk_loop.iterary) != SVt_PVAV) {
1506 if (SvNIOKp(sv) || !SvPOKp(sv) ||
1507 (looks_like_number(sv) && *SvPVX(sv) != '0')) {
1508 if (SvNV(sv) < IV_MIN ||
1509 SvNV((SV*)cx->blk_loop.iterary) >= IV_MAX)
1510 croak("Range iterator outside integer range");
1511 cx->blk_loop.iterix = SvIV(sv);
1512 cx->blk_loop.itermax = SvIV((SV*)cx->blk_loop.iterary);
1515 cx->blk_loop.iterlval = newSVsv(sv);
1519 cx->blk_loop.iterary = PL_curstack;
1520 AvFILLp(PL_curstack) = SP - PL_stack_base;
1521 cx->blk_loop.iterix = MARK - PL_stack_base;
1530 register PERL_CONTEXT *cx;
1531 I32 gimme = GIMME_V;
1537 PUSHBLOCK(cx, CXt_LOOP, SP);
1538 PUSHLOOP(cx, 0, SP);
1546 register PERL_CONTEXT *cx;
1547 struct block_loop cxloop;
1555 POPLOOP1(cx); /* Delay POPLOOP2 until stack values are safe */
1558 if (gimme == G_VOID)
1560 else if (gimme == G_SCALAR) {
1562 *++newsp = sv_mortalcopy(*SP);
1564 *++newsp = &PL_sv_undef;
1568 *++newsp = sv_mortalcopy(*++mark);
1569 TAINT_NOT; /* Each item is independent */
1575 POPLOOP2(); /* Stack values are safe: release loop vars ... */
1576 PL_curpm = newpm; /* ... and pop $1 et al */
1588 register PERL_CONTEXT *cx;
1589 struct block_sub cxsub;
1590 bool popsub2 = FALSE;
1596 if (PL_curstackinfo->si_type == PERLSI_SORT) {
1597 if (cxstack_ix == PL_sortcxix || dopoptosub(cxstack_ix) <= PL_sortcxix) {
1598 if (cxstack_ix > PL_sortcxix)
1599 dounwind(PL_sortcxix);
1600 AvARRAY(PL_curstack)[1] = *SP;
1601 PL_stack_sp = PL_stack_base + 1;
1606 cxix = dopoptosub(cxstack_ix);
1608 DIE("Can't return outside a subroutine");
1609 if (cxix < cxstack_ix)
1613 switch (cx->cx_type) {
1615 POPSUB1(cx); /* Delay POPSUB2 until stack values are safe */
1620 if (optype == OP_REQUIRE &&
1621 (MARK == SP || (gimme == G_SCALAR && !SvTRUE(*SP))) )
1623 /* Unassume the success we assumed earlier. */
1624 char *name = cx->blk_eval.old_name;
1625 (void)hv_delete(GvHVn(PL_incgv), name, strlen(name), G_DISCARD);
1626 DIE("%s did not return a true value", name);
1630 DIE("panic: return");
1634 if (gimme == G_SCALAR) {
1637 if (cxsub.cv && CvDEPTH(cxsub.cv) > 1) {
1639 *++newsp = SvREFCNT_inc(*SP);
1644 *++newsp = sv_mortalcopy(*SP);
1647 *++newsp = (SvTEMP(*SP)) ? *SP : sv_mortalcopy(*SP);
1649 *++newsp = sv_mortalcopy(*SP);
1651 *++newsp = &PL_sv_undef;
1653 else if (gimme == G_ARRAY) {
1654 while (++MARK <= SP) {
1655 *++newsp = (popsub2 && SvTEMP(*MARK))
1656 ? *MARK : sv_mortalcopy(*MARK);
1657 TAINT_NOT; /* Each item is independent */
1660 PL_stack_sp = newsp;
1662 /* Stack values are safe: */
1664 POPSUB2(); /* release CV and @_ ... */
1666 PL_curpm = newpm; /* ... and pop $1 et al */
1669 return pop_return();
1676 register PERL_CONTEXT *cx;
1677 struct block_loop cxloop;
1678 struct block_sub cxsub;
1685 SV **mark = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
1687 if (PL_op->op_flags & OPf_SPECIAL) {
1688 cxix = dopoptoloop(cxstack_ix);
1690 DIE("Can't \"last\" outside a block");
1693 cxix = dopoptolabel(cPVOP->op_pv);
1695 DIE("Label not found for \"last %s\"", cPVOP->op_pv);
1697 if (cxix < cxstack_ix)
1701 switch (cx->cx_type) {
1703 POPLOOP1(cx); /* Delay POPLOOP2 until stack values are safe */
1705 nextop = cxloop.last_op->op_next;
1708 POPSUB1(cx); /* Delay POPSUB2 until stack values are safe */
1710 nextop = pop_return();
1714 nextop = pop_return();
1721 if (gimme == G_SCALAR) {
1723 *++newsp = ((pop2 == CXt_SUB) && SvTEMP(*SP))
1724 ? *SP : sv_mortalcopy(*SP);
1726 *++newsp = &PL_sv_undef;
1728 else if (gimme == G_ARRAY) {
1729 while (++MARK <= SP) {
1730 *++newsp = ((pop2 == CXt_SUB) && SvTEMP(*MARK))
1731 ? *MARK : sv_mortalcopy(*MARK);
1732 TAINT_NOT; /* Each item is independent */
1738 /* Stack values are safe: */
1741 POPLOOP2(); /* release loop vars ... */
1745 POPSUB2(); /* release CV and @_ ... */
1748 PL_curpm = newpm; /* ... and pop $1 et al */
1757 register PERL_CONTEXT *cx;
1760 if (PL_op->op_flags & OPf_SPECIAL) {
1761 cxix = dopoptoloop(cxstack_ix);
1763 DIE("Can't \"next\" outside a block");
1766 cxix = dopoptolabel(cPVOP->op_pv);
1768 DIE("Label not found for \"next %s\"", cPVOP->op_pv);
1770 if (cxix < cxstack_ix)
1774 oldsave = PL_scopestack[PL_scopestack_ix - 1];
1775 LEAVE_SCOPE(oldsave);
1776 return cx->blk_loop.next_op;
1782 register PERL_CONTEXT *cx;
1785 if (PL_op->op_flags & OPf_SPECIAL) {
1786 cxix = dopoptoloop(cxstack_ix);
1788 DIE("Can't \"redo\" outside a block");
1791 cxix = dopoptolabel(cPVOP->op_pv);
1793 DIE("Label not found for \"redo %s\"", cPVOP->op_pv);
1795 if (cxix < cxstack_ix)
1799 oldsave = PL_scopestack[PL_scopestack_ix - 1];
1800 LEAVE_SCOPE(oldsave);
1801 return cx->blk_loop.redo_op;
1805 dofindlabel(OP *o, char *label, OP **opstack, OP **oplimit)
1809 static char too_deep[] = "Target of goto is too deeply nested";
1813 if (o->op_type == OP_LEAVE ||
1814 o->op_type == OP_SCOPE ||
1815 o->op_type == OP_LEAVELOOP ||
1816 o->op_type == OP_LEAVETRY)
1818 *ops++ = cUNOPo->op_first;
1823 if (o->op_flags & OPf_KIDS) {
1825 /* First try all the kids at this level, since that's likeliest. */
1826 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
1827 if ((kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) &&
1828 kCOP->cop_label && strEQ(kCOP->cop_label, label))
1831 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
1832 if (kid == PL_lastgotoprobe)
1834 if ((kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) &&
1836 (ops[-1]->op_type != OP_NEXTSTATE &&
1837 ops[-1]->op_type != OP_DBSTATE)))
1839 if (o = dofindlabel(kid, label, ops, oplimit))
1849 return pp_goto(ARGS);
1858 register PERL_CONTEXT *cx;
1859 #define GOTO_DEPTH 64
1860 OP *enterops[GOTO_DEPTH];
1862 int do_dump = (PL_op->op_type == OP_DUMP);
1865 if (PL_op->op_flags & OPf_STACKED) {
1868 /* This egregious kludge implements goto &subroutine */
1869 if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVCV) {
1871 register PERL_CONTEXT *cx;
1872 CV* cv = (CV*)SvRV(sv);
1877 if (!CvROOT(cv) && !CvXSUB(cv)) {
1879 SV *tmpstr = sv_newmortal();
1880 gv_efullname3(tmpstr, CvGV(cv), Nullch);
1881 DIE("Goto undefined subroutine &%s",SvPVX(tmpstr));
1883 DIE("Goto undefined subroutine");
1886 /* First do some returnish stuff. */
1887 cxix = dopoptosub(cxstack_ix);
1889 DIE("Can't goto subroutine outside a subroutine");
1890 if (cxix < cxstack_ix)
1893 if (cx->cx_type == CXt_EVAL && cx->blk_eval.old_op_type == OP_ENTEREVAL)
1894 DIE("Can't goto subroutine from an eval-string");
1896 if (cx->cx_type == CXt_SUB &&
1897 cx->blk_sub.hasargs) { /* put @_ back onto stack */
1898 AV* av = cx->blk_sub.argarray;
1900 items = AvFILLp(av) + 1;
1902 EXTEND(PL_stack_sp, items); /* @_ could have been extended. */
1903 Copy(AvARRAY(av), PL_stack_sp, items, SV*);
1904 PL_stack_sp += items;
1906 SvREFCNT_dec(GvAV(PL_defgv));
1907 GvAV(PL_defgv) = cx->blk_sub.savearray;
1908 #endif /* USE_THREADS */
1912 else if (CvXSUB(cv)) { /* put GvAV(defgv) back onto stack */
1916 av = (AV*)PL_curpad[0];
1918 av = GvAV(PL_defgv);
1920 items = AvFILLp(av) + 1;
1922 EXTEND(PL_stack_sp, items); /* @_ could have been extended. */
1923 Copy(AvARRAY(av), PL_stack_sp, items, SV*);
1924 PL_stack_sp += items;
1926 if (cx->cx_type == CXt_SUB &&
1927 !(CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth))
1928 SvREFCNT_dec(cx->blk_sub.cv);
1929 oldsave = PL_scopestack[PL_scopestack_ix - 1];
1930 LEAVE_SCOPE(oldsave);
1932 /* Now do some callish stuff. */
1935 if (CvOLDSTYLE(cv)) {
1936 I32 (*fp3)_((int,int,int));
1941 fp3 = (I32(*)_((int,int,int)))CvXSUB(cv);
1942 items = (*fp3)(CvXSUBANY(cv).any_i32,
1943 mark - PL_stack_base + 1,
1945 SP = PL_stack_base + items;
1951 PL_stack_sp--; /* There is no cv arg. */
1952 /* Push a mark for the start of arglist */
1954 (void)(*CvXSUB(cv))(cv _PERL_OBJECT_THIS);
1955 /* Pop the current context like a decent sub should */
1956 POPBLOCK(cx, PL_curpm);
1957 /* Do _not_ use PUTBACK, keep the XSUB's return stack! */
1960 return pop_return();
1963 AV* padlist = CvPADLIST(cv);
1964 SV** svp = AvARRAY(padlist);
1965 if (cx->cx_type == CXt_EVAL) {
1966 PL_in_eval = cx->blk_eval.old_in_eval;
1967 PL_eval_root = cx->blk_eval.old_eval_root;
1968 cx->cx_type = CXt_SUB;
1969 cx->blk_sub.hasargs = 0;
1971 cx->blk_sub.cv = cv;
1972 cx->blk_sub.olddepth = CvDEPTH(cv);
1974 if (CvDEPTH(cv) < 2)
1975 (void)SvREFCNT_inc(cv);
1976 else { /* save temporaries on recursion? */
1977 if (CvDEPTH(cv) == 100 && ckWARN(WARN_RECURSION))
1978 sub_crush_depth(cv);
1979 if (CvDEPTH(cv) > AvFILLp(padlist)) {
1980 AV *newpad = newAV();
1981 SV **oldpad = AvARRAY(svp[CvDEPTH(cv)-1]);
1982 I32 ix = AvFILLp((AV*)svp[1]);
1983 svp = AvARRAY(svp[0]);
1984 for ( ;ix > 0; ix--) {
1985 if (svp[ix] != &PL_sv_undef) {
1986 char *name = SvPVX(svp[ix]);
1987 if ((SvFLAGS(svp[ix]) & SVf_FAKE)
1990 /* outer lexical or anon code */
1991 av_store(newpad, ix,
1992 SvREFCNT_inc(oldpad[ix]) );
1994 else { /* our own lexical */
1996 av_store(newpad, ix, sv = (SV*)newAV());
1997 else if (*name == '%')
1998 av_store(newpad, ix, sv = (SV*)newHV());
2000 av_store(newpad, ix, sv = NEWSV(0,0));
2005 av_store(newpad, ix, sv = NEWSV(0,0));
2009 if (cx->blk_sub.hasargs) {
2012 av_store(newpad, 0, (SV*)av);
2013 AvFLAGS(av) = AVf_REIFY;
2015 av_store(padlist, CvDEPTH(cv), (SV*)newpad);
2016 AvFILLp(padlist) = CvDEPTH(cv);
2017 svp = AvARRAY(padlist);
2021 if (!cx->blk_sub.hasargs) {
2022 AV* av = (AV*)PL_curpad[0];
2024 items = AvFILLp(av) + 1;
2026 /* Mark is at the end of the stack. */
2028 Copy(AvARRAY(av), SP + 1, items, SV*);
2033 #endif /* USE_THREADS */
2034 SAVESPTR(PL_curpad);
2035 PL_curpad = AvARRAY((AV*)svp[CvDEPTH(cv)]);
2037 if (cx->blk_sub.hasargs)
2038 #endif /* USE_THREADS */
2040 AV* av = (AV*)PL_curpad[0];
2044 cx->blk_sub.savearray = GvAV(PL_defgv);
2045 GvAV(PL_defgv) = (AV*)SvREFCNT_inc(av);
2046 #endif /* USE_THREADS */
2047 cx->blk_sub.argarray = av;
2050 if (items >= AvMAX(av) + 1) {
2052 if (AvARRAY(av) != ary) {
2053 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
2054 SvPVX(av) = (char*)ary;
2056 if (items >= AvMAX(av) + 1) {
2057 AvMAX(av) = items - 1;
2058 Renew(ary,items+1,SV*);
2060 SvPVX(av) = (char*)ary;
2063 Copy(mark,AvARRAY(av),items,SV*);
2064 AvFILLp(av) = items - 1;
2072 if (PERLDB_SUB) { /* Checking curstash breaks DProf. */
2074 * We do not care about using sv to call CV;
2075 * it's for informational purposes only.
2077 SV *sv = GvSV(PL_DBsub);
2080 if (PERLDB_SUB_NN) {
2081 SvIVX(sv) = (IV)cv; /* Already upgraded, saved */
2084 gv_efullname3(sv, CvGV(cv), Nullch);
2087 && (gotocv = perl_get_cv("DB::goto", FALSE)) ) {
2088 PUSHMARK( PL_stack_sp );
2089 perl_call_sv((SV*)gotocv, G_SCALAR | G_NODEBUG);
2093 RETURNOP(CvSTART(cv));
2097 label = SvPV(sv,PL_na);
2099 else if (PL_op->op_flags & OPf_SPECIAL) {
2101 DIE("goto must have label");
2104 label = cPVOP->op_pv;
2106 if (label && *label) {
2111 PL_lastgotoprobe = 0;
2113 for (ix = cxstack_ix; ix >= 0; ix--) {
2115 switch (cx->cx_type) {
2117 gotoprobe = PL_eval_root; /* XXX not good for nested eval */
2120 gotoprobe = cx->blk_oldcop->op_sibling;
2126 gotoprobe = cx->blk_oldcop->op_sibling;
2128 gotoprobe = PL_main_root;
2131 if (CvDEPTH(cx->blk_sub.cv)) {
2132 gotoprobe = CvROOT(cx->blk_sub.cv);
2137 DIE("Can't \"goto\" outside a block");
2141 gotoprobe = PL_main_root;
2144 retop = dofindlabel(gotoprobe, label,
2145 enterops, enterops + GOTO_DEPTH);
2148 PL_lastgotoprobe = gotoprobe;
2151 DIE("Can't find label %s", label);
2153 /* pop unwanted frames */
2155 if (ix < cxstack_ix) {
2162 oldsave = PL_scopestack[PL_scopestack_ix];
2163 LEAVE_SCOPE(oldsave);
2166 /* push wanted frames */
2168 if (*enterops && enterops[1]) {
2170 for (ix = 1; enterops[ix]; ix++) {
2171 PL_op = enterops[ix];
2172 /* Eventually we may want to stack the needed arguments
2173 * for each op. For now, we punt on the hard ones. */
2174 if (PL_op->op_type == OP_ENTERITER)
2175 DIE("Can't \"goto\" into the middle of a foreach loop",
2177 (CALLOP->op_ppaddr)(ARGS);
2185 if (!retop) retop = PL_main_start;
2187 PL_restartop = retop;
2188 PL_do_undump = TRUE;
2192 PL_restartop = 0; /* hmm, must be GNU unexec().. */
2193 PL_do_undump = FALSE;
2196 if (PL_top_env->je_prev) {
2197 PL_restartop = retop;
2214 if (anum == 1 && VMSISH_EXIT)
2219 PUSHs(&PL_sv_undef);
2227 double value = SvNVx(GvSV(cCOP->cop_gv));
2228 register I32 match = I_32(value);
2231 if (((double)match) > value)
2232 --match; /* was fractional--truncate other way */
2234 match -= cCOP->uop.scop.scop_offset;
2237 else if (match > cCOP->uop.scop.scop_max)
2238 match = cCOP->uop.scop.scop_max;
2239 PL_op = cCOP->uop.scop.scop_next[match];
2249 PL_op = PL_op->op_next; /* can't assume anything */
2251 match = *(SvPVx(GvSV(cCOP->cop_gv), PL_na)) & 255;
2252 match -= cCOP->uop.scop.scop_offset;
2255 else if (match > cCOP->uop.scop.scop_max)
2256 match = cCOP->uop.scop.scop_max;
2257 PL_op = cCOP->uop.scop.scop_next[match];
2266 save_lines(AV *array, SV *sv)
2268 register char *s = SvPVX(sv);
2269 register char *send = SvPVX(sv) + SvCUR(sv);
2271 register I32 line = 1;
2273 while (s && s < send) {
2274 SV *tmpstr = NEWSV(85,0);
2276 sv_upgrade(tmpstr, SVt_PVMG);
2277 t = strchr(s, '\n');
2283 sv_setpvn(tmpstr, s, t - s);
2284 av_store(array, line++, tmpstr);
2299 assert(CATCH_GET == TRUE);
2300 DEBUG_l(deb("Setting up local jumplevel %p, was %p\n", &cur_env, PL_top_env));
2304 default: /* topmost level handles it */
2310 if (!PL_restartop) {
2311 PerlIO_printf(PerlIO_stderr(), "panic: restartop\n");
2314 PL_op = PL_restartop;
2327 sv_compile_2op(SV *sv, OP** startop, char *code, AV** avp)
2328 /* sv Text to convert to OP tree. */
2329 /* startop op_free() this to undo. */
2330 /* code Short string id of the caller. */
2332 dSP; /* Make POPBLOCK work. */
2335 I32 gimme = 0; /* SUSPECT - INITIALZE TO WHAT? NI-S */
2338 OP *oop = PL_op, *rop;
2339 char tmpbuf[TYPE_DIGITS(long) + 12 + 10];
2345 /* switch to eval mode */
2347 if (PL_curcop == &PL_compiling) {
2348 SAVESPTR(PL_compiling.cop_stash);
2349 PL_compiling.cop_stash = PL_curstash;
2351 SAVESPTR(PL_compiling.cop_filegv);
2352 SAVEI16(PL_compiling.cop_line);
2353 sprintf(tmpbuf, "_<(%.10s_eval %lu)", code, (unsigned long)++PL_evalseq);
2354 PL_compiling.cop_filegv = gv_fetchfile(tmpbuf+2);
2355 PL_compiling.cop_line = 1;
2356 /* XXX For C<eval "...">s within BEGIN {} blocks, this ends up
2357 deleting the eval's FILEGV from the stash before gv_check() runs
2358 (i.e. before run-time proper). To work around the coredump that
2359 ensues, we always turn GvMULTI_on for any globals that were
2360 introduced within evals. See force_ident(). GSAR 96-10-12 */
2361 safestr = savepv(tmpbuf);
2362 SAVEDELETE(PL_defstash, safestr, strlen(safestr));
2364 #ifdef OP_IN_REGISTER
2372 PL_op->op_type = 0; /* Avoid uninit warning. */
2373 PL_op->op_flags = 0; /* Avoid uninit warning. */
2374 PUSHBLOCK(cx, CXt_EVAL, SP);
2375 PUSHEVAL(cx, 0, PL_compiling.cop_filegv);
2376 rop = doeval(G_SCALAR, startop);
2377 POPBLOCK(cx,PL_curpm);
2380 (*startop)->op_type = OP_NULL;
2381 (*startop)->op_ppaddr = ppaddr[OP_NULL];
2383 *avp = (AV*)SvREFCNT_inc(PL_comppad);
2385 if (curcop = &PL_compiling)
2386 PL_compiling.op_private = PL_hints;
2387 #ifdef OP_IN_REGISTER
2393 /* With USE_THREADS, eval_owner must be held on entry to doeval */
2395 doeval(int gimme, OP** startop)
2408 /* set up a scratch pad */
2411 SAVESPTR(PL_curpad);
2412 SAVESPTR(PL_comppad);
2413 SAVESPTR(PL_comppad_name);
2414 SAVEI32(PL_comppad_name_fill);
2415 SAVEI32(PL_min_intro_pending);
2416 SAVEI32(PL_max_intro_pending);
2419 for (i = cxstack_ix; i >= 0; i--) {
2420 PERL_CONTEXT *cx = &cxstack[i];
2421 if (cx->cx_type == CXt_EVAL)
2423 else if (cx->cx_type == CXt_SUB) {
2424 caller = cx->blk_sub.cv;
2429 SAVESPTR(PL_compcv);
2430 PL_compcv = (CV*)NEWSV(1104,0);
2431 sv_upgrade((SV *)PL_compcv, SVt_PVCV);
2432 CvUNIQUE_on(PL_compcv);
2434 CvOWNER(PL_compcv) = 0;
2435 New(666, CvMUTEXP(PL_compcv), 1, perl_mutex);
2436 MUTEX_INIT(CvMUTEXP(PL_compcv));
2437 #endif /* USE_THREADS */
2439 PL_comppad = newAV();
2440 av_push(PL_comppad, Nullsv);
2441 PL_curpad = AvARRAY(PL_comppad);
2442 PL_comppad_name = newAV();
2443 PL_comppad_name_fill = 0;
2444 PL_min_intro_pending = 0;
2447 av_store(PL_comppad_name, 0, newSVpv("@_", 2));
2448 PL_curpad[0] = (SV*)newAV();
2449 SvPADMY_on(PL_curpad[0]); /* XXX Needed? */
2450 #endif /* USE_THREADS */
2452 comppadlist = newAV();
2453 AvREAL_off(comppadlist);
2454 av_store(comppadlist, 0, (SV*)PL_comppad_name);
2455 av_store(comppadlist, 1, (SV*)PL_comppad);
2456 CvPADLIST(PL_compcv) = comppadlist;
2458 if (!saveop || saveop->op_type != OP_REQUIRE)
2459 CvOUTSIDE(PL_compcv) = (CV*)SvREFCNT_inc(caller);
2461 SAVEFREESV(PL_compcv);
2463 /* make sure we compile in the right package */
2465 newstash = PL_curcop->cop_stash;
2466 if (PL_curstash != newstash) {
2467 SAVESPTR(PL_curstash);
2468 PL_curstash = newstash;
2470 SAVESPTR(PL_beginav);
2471 PL_beginav = newAV();
2472 SAVEFREESV(PL_beginav);
2474 /* try to compile it */
2476 PL_eval_root = Nullop;
2478 PL_curcop = &PL_compiling;
2479 PL_curcop->cop_arybase = 0;
2480 SvREFCNT_dec(PL_rs);
2481 PL_rs = newSVpv("\n", 1);
2482 if (saveop && saveop->op_flags & OPf_SPECIAL)
2486 if (yyparse() || PL_error_count || !PL_eval_root) {
2490 I32 optype = 0; /* Might be reset by POPEVAL. */
2494 op_free(PL_eval_root);
2495 PL_eval_root = Nullop;
2497 SP = PL_stack_base + POPMARK; /* pop original mark */
2499 POPBLOCK(cx,PL_curpm);
2505 if (optype == OP_REQUIRE) {
2506 char* msg = SvPVx(ERRSV, PL_na);
2507 DIE("%s", *msg ? msg : "Compilation failed in require");
2508 } else if (startop) {
2509 char* msg = SvPVx(ERRSV, PL_na);
2511 POPBLOCK(cx,PL_curpm);
2513 croak("%sCompilation failed in regexp", (*msg ? msg : "Unknown error\n"));
2515 SvREFCNT_dec(PL_rs);
2516 PL_rs = SvREFCNT_inc(PL_nrs);
2518 MUTEX_LOCK(&PL_eval_mutex);
2520 COND_SIGNAL(&PL_eval_cond);
2521 MUTEX_UNLOCK(&PL_eval_mutex);
2522 #endif /* USE_THREADS */
2525 SvREFCNT_dec(PL_rs);
2526 PL_rs = SvREFCNT_inc(PL_nrs);
2527 PL_compiling.cop_line = 0;
2529 *startop = PL_eval_root;
2530 SvREFCNT_dec(CvOUTSIDE(PL_compcv));
2531 CvOUTSIDE(PL_compcv) = Nullcv;
2533 SAVEFREEOP(PL_eval_root);
2535 scalarvoid(PL_eval_root);
2536 else if (gimme & G_ARRAY)
2539 scalar(PL_eval_root);
2541 DEBUG_x(dump_eval());
2543 /* Register with debugger: */
2544 if (PERLDB_INTER && saveop->op_type == OP_REQUIRE) {
2545 CV *cv = perl_get_cv("DB::postponed", FALSE);
2549 XPUSHs((SV*)PL_compiling.cop_filegv);
2551 perl_call_sv((SV*)cv, G_DISCARD);
2555 /* compiled okay, so do it */
2557 CvDEPTH(PL_compcv) = 1;
2558 SP = PL_stack_base + POPMARK; /* pop original mark */
2559 PL_op = saveop; /* The caller may need it. */
2561 MUTEX_LOCK(&PL_eval_mutex);
2563 COND_SIGNAL(&PL_eval_cond);
2564 MUTEX_UNLOCK(&PL_eval_mutex);
2565 #endif /* USE_THREADS */
2567 RETURNOP(PL_eval_start);
2573 register PERL_CONTEXT *cx;
2578 SV *namesv = Nullsv;
2580 I32 gimme = G_SCALAR;
2581 PerlIO *tryrsfp = 0;
2584 if (SvNIOKp(sv) && !SvPOKp(sv)) {
2585 SET_NUMERIC_STANDARD();
2586 if (atof(PL_patchlevel) + 0.00000999 < SvNV(sv))
2587 DIE("Perl %s required--this is only version %s, stopped",
2588 SvPV(sv,PL_na),PL_patchlevel);
2591 name = SvPV(sv, len);
2592 if (!(name && len > 0 && *name))
2593 DIE("Null filename used");
2594 TAINT_PROPER("require");
2595 if (PL_op->op_type == OP_REQUIRE &&
2596 (svp = hv_fetch(GvHVn(PL_incgv), name, len, 0)) &&
2597 *svp != &PL_sv_undef)
2600 /* prepare to compile file */
2605 (name[1] == '.' && name[2] == '/')))
2607 || (name[0] && name[1] == ':')
2610 || (name[0] == '\\' && name[1] == '\\') /* UNC path */
2613 || (strchr(name,':') || ((*name == '[' || *name == '<') &&
2614 (isALNUM(name[1]) || strchr("$-_]>",name[1]))))
2619 tryrsfp = PerlIO_open(name,PERL_SCRIPT_MODE);
2622 AV *ar = GvAVn(PL_incgv);
2626 if ((unixname = tounixspec(name, Nullch)) != Nullch)
2629 namesv = NEWSV(806, 0);
2630 for (i = 0; i <= AvFILL(ar); i++) {
2631 char *dir = SvPVx(*av_fetch(ar, i, TRUE), PL_na);
2634 if ((unixdir = tounixpath(dir, Nullch)) == Nullch)
2636 sv_setpv(namesv, unixdir);
2637 sv_catpv(namesv, unixname);
2639 sv_setpvf(namesv, "%s/%s", dir, name);
2641 tryname = SvPVX(namesv);
2642 tryrsfp = PerlIO_open(tryname, PERL_SCRIPT_MODE);
2644 if (tryname[0] == '.' && tryname[1] == '/')
2651 SAVESPTR(PL_compiling.cop_filegv);
2652 PL_compiling.cop_filegv = gv_fetchfile(tryrsfp ? tryname : name);
2653 SvREFCNT_dec(namesv);
2655 if (PL_op->op_type == OP_REQUIRE) {
2656 SV *msg = sv_2mortal(newSVpvf("Can't locate %s in @INC", name));
2657 SV *dirmsgsv = NEWSV(0, 0);
2658 AV *ar = GvAVn(PL_incgv);
2660 if (instr(SvPVX(msg), ".h "))
2661 sv_catpv(msg, " (change .h to .ph maybe?)");
2662 if (instr(SvPVX(msg), ".ph "))
2663 sv_catpv(msg, " (did you run h2ph?)");
2664 sv_catpv(msg, " (@INC contains:");
2665 for (i = 0; i <= AvFILL(ar); i++) {
2666 char *dir = SvPVx(*av_fetch(ar, i, TRUE), PL_na);
2667 sv_setpvf(dirmsgsv, " %s", dir);
2668 sv_catsv(msg, dirmsgsv);
2670 sv_catpvn(msg, ")", 1);
2671 SvREFCNT_dec(dirmsgsv);
2678 /* Assume success here to prevent recursive requirement. */
2679 (void)hv_store(GvHVn(PL_incgv), name, strlen(name),
2680 newSVsv(GvSV(PL_compiling.cop_filegv)), 0 );
2684 lex_start(sv_2mortal(newSVpv("",0)));
2685 if (PL_rsfp_filters){
2686 save_aptr(&PL_rsfp_filters);
2687 PL_rsfp_filters = NULL;
2691 name = savepv(name);
2695 SAVEPPTR(PL_compiling.cop_warnings);
2696 PL_compiling.cop_warnings = ((PL_dowarn & G_WARN_ALL_ON) ? WARN_ALL
2699 /* switch to eval mode */
2701 push_return(PL_op->op_next);
2702 PUSHBLOCK(cx, CXt_EVAL, SP);
2703 PUSHEVAL(cx, name, PL_compiling.cop_filegv);
2705 PL_compiling.cop_line = 0;
2709 MUTEX_LOCK(&PL_eval_mutex);
2710 if (PL_eval_owner && PL_eval_owner != thr)
2711 while (PL_eval_owner)
2712 COND_WAIT(&PL_eval_cond, &PL_eval_mutex);
2713 PL_eval_owner = thr;
2714 MUTEX_UNLOCK(&PL_eval_mutex);
2715 #endif /* USE_THREADS */
2716 return DOCATCH(doeval(G_SCALAR, NULL));
2721 return pp_require(ARGS);
2727 register PERL_CONTEXT *cx;
2729 I32 gimme = GIMME_V, was = PL_sub_generation;
2730 char tmpbuf[TYPE_DIGITS(long) + 12];
2735 if (!SvPV(sv,len) || !len)
2737 TAINT_PROPER("eval");
2743 /* switch to eval mode */
2745 SAVESPTR(PL_compiling.cop_filegv);
2746 sprintf(tmpbuf, "_<(eval %lu)", (unsigned long)++PL_evalseq);
2747 PL_compiling.cop_filegv = gv_fetchfile(tmpbuf+2);
2748 PL_compiling.cop_line = 1;
2749 /* XXX For C<eval "...">s within BEGIN {} blocks, this ends up
2750 deleting the eval's FILEGV from the stash before gv_check() runs
2751 (i.e. before run-time proper). To work around the coredump that
2752 ensues, we always turn GvMULTI_on for any globals that were
2753 introduced within evals. See force_ident(). GSAR 96-10-12 */
2754 safestr = savepv(tmpbuf);
2755 SAVEDELETE(PL_defstash, safestr, strlen(safestr));
2757 PL_hints = PL_op->op_targ;
2758 SAVEPPTR(compiling.cop_warnings);
2759 if (PL_compiling.cop_warnings != WARN_ALL
2760 && PL_compiling.cop_warnings != WARN_NONE){
2761 PL_compiling.cop_warnings = newSVsv(PL_compiling.cop_warnings) ;
2762 SAVEFREESV(PL_compiling.cop_warnings) ;
2765 push_return(PL_op->op_next);
2766 PUSHBLOCK(cx, CXt_EVAL, SP);
2767 PUSHEVAL(cx, 0, PL_compiling.cop_filegv);
2769 /* prepare to compile string */
2771 if (PERLDB_LINE && PL_curstash != PL_debstash)
2772 save_lines(GvAV(PL_compiling.cop_filegv), PL_linestr);
2775 MUTEX_LOCK(&PL_eval_mutex);
2776 if (PL_eval_owner && PL_eval_owner != thr)
2777 while (PL_eval_owner)
2778 COND_WAIT(&PL_eval_cond, &PL_eval_mutex);
2779 PL_eval_owner = thr;
2780 MUTEX_UNLOCK(&PL_eval_mutex);
2781 #endif /* USE_THREADS */
2782 ret = doeval(gimme, NULL);
2783 if (PERLDB_INTER && was != PL_sub_generation /* Some subs defined here. */
2784 && ret != PL_op->op_next) { /* Successive compilation. */
2785 strcpy(safestr, "_<(eval )"); /* Anything fake and short. */
2787 return DOCATCH(ret);
2797 register PERL_CONTEXT *cx;
2799 U8 save_flags = PL_op -> op_flags;
2804 retop = pop_return();
2807 if (gimme == G_VOID)
2809 else if (gimme == G_SCALAR) {
2812 if (SvFLAGS(TOPs) & SVs_TEMP)
2815 *MARK = sv_mortalcopy(TOPs);
2819 *MARK = &PL_sv_undef;
2823 /* in case LEAVE wipes old return values */
2824 for (mark = newsp + 1; mark <= SP; mark++) {
2825 if (!(SvFLAGS(*mark) & SVs_TEMP)) {
2826 *mark = sv_mortalcopy(*mark);
2827 TAINT_NOT; /* Each item is independent */
2831 PL_curpm = newpm; /* Don't pop $1 et al till now */
2834 * Closures mentioned at top level of eval cannot be referenced
2835 * again, and their presence indirectly causes a memory leak.
2836 * (Note that the fact that compcv and friends are still set here
2837 * is, AFAIK, an accident.) --Chip
2839 if (AvFILLp(PL_comppad_name) >= 0) {
2840 SV **svp = AvARRAY(PL_comppad_name);
2842 for (ix = AvFILLp(PL_comppad_name); ix >= 0; ix--) {
2844 if (sv && sv != &PL_sv_undef && *SvPVX(sv) == '&') {
2846 svp[ix] = &PL_sv_undef;
2850 SvREFCNT_dec(CvOUTSIDE(sv));
2851 CvOUTSIDE(sv) = Nullcv;
2864 assert(CvDEPTH(PL_compcv) == 1);
2866 CvDEPTH(PL_compcv) = 0;
2869 if (optype == OP_REQUIRE &&
2870 !(gimme == G_SCALAR ? SvTRUE(*SP) : SP > newsp))
2872 /* Unassume the success we assumed earlier. */
2873 char *name = cx->blk_eval.old_name;
2874 (void)hv_delete(GvHVn(PL_incgv), name, strlen(name), G_DISCARD);
2875 retop = die("%s did not return a true value", name);
2876 /* die_where() did LEAVE, or we won't be here */
2880 if (!(save_flags & OPf_SPECIAL))
2890 register PERL_CONTEXT *cx;
2891 I32 gimme = GIMME_V;
2896 push_return(cLOGOP->op_other->op_next);
2897 PUSHBLOCK(cx, CXt_EVAL, SP);
2899 PL_eval_root = PL_op; /* Only needed so that goto works right. */
2904 return DOCATCH(PL_op->op_next);
2914 register PERL_CONTEXT *cx;
2922 if (gimme == G_VOID)
2924 else if (gimme == G_SCALAR) {
2927 if (SvFLAGS(TOPs) & (SVs_PADTMP|SVs_TEMP))
2930 *MARK = sv_mortalcopy(TOPs);
2934 *MARK = &PL_sv_undef;
2939 /* in case LEAVE wipes old return values */
2940 for (mark = newsp + 1; mark <= SP; mark++) {
2941 if (!(SvFLAGS(*mark) & (SVs_PADTMP|SVs_TEMP))) {
2942 *mark = sv_mortalcopy(*mark);
2943 TAINT_NOT; /* Each item is independent */
2947 PL_curpm = newpm; /* Don't pop $1 et al till now */
2958 register char *s = SvPV_force(sv, len);
2959 register char *send = s + len;
2960 register char *base;
2961 register I32 skipspaces = 0;
2964 bool postspace = FALSE;
2972 croak("Null picture in formline");
2974 New(804, fops, (send - s)*3+10, U16); /* Almost certainly too long... */
2979 *fpc++ = FF_LINEMARK;
2980 noblank = repeat = FALSE;
2998 case ' ': case '\t':
3009 *fpc++ = FF_LITERAL;
3017 *fpc++ = skipspaces;
3021 *fpc++ = FF_NEWLINE;
3025 arg = fpc - linepc + 1;
3032 *fpc++ = FF_LINEMARK;
3033 noblank = repeat = FALSE;
3042 ischop = s[-1] == '^';
3048 arg = (s - base) - 1;
3050 *fpc++ = FF_LITERAL;
3059 *fpc++ = FF_LINEGLOB;
3061 else if (*s == '#' || (*s == '.' && s[1] == '#')) {
3062 arg = ischop ? 512 : 0;
3072 arg |= 256 + (s - f);
3074 *fpc++ = s - base; /* fieldsize for FETCH */
3075 *fpc++ = FF_DECIMAL;
3080 bool ismore = FALSE;
3083 while (*++s == '>') ;
3084 prespace = FF_SPACE;
3086 else if (*s == '|') {
3087 while (*++s == '|') ;
3088 prespace = FF_HALFSPACE;
3093 while (*++s == '<') ;
3096 if (*s == '.' && s[1] == '.' && s[2] == '.') {
3100 *fpc++ = s - base; /* fieldsize for FETCH */
3102 *fpc++ = ischop ? FF_CHECKCHOP : FF_CHECKNL;
3120 { /* need to jump to the next word */
3122 z = WORD_ALIGN - SvCUR(sv) % WORD_ALIGN;
3123 SvGROW(sv, SvCUR(sv) + z + arg * sizeof(U16) + 4);
3124 s = SvPVX(sv) + SvCUR(sv) + z;
3126 Copy(fops, s, arg, U16);
3128 sv_magic(sv, Nullsv, 'f', Nullch, 0);
3133 * The rest of this file was derived from source code contributed
3136 * NOTE: this code was derived from Tom Horsley's qsort replacement
3137 * and should not be confused with the original code.
3140 /* Copyright (C) Tom Horsley, 1997. All rights reserved.
3142 Permission granted to distribute under the same terms as perl which are
3145 This program is free software; you can redistribute it and/or modify
3146 it under the terms of either:
3148 a) the GNU General Public License as published by the Free
3149 Software Foundation; either version 1, or (at your option) any
3152 b) the "Artistic License" which comes with this Kit.
3154 Details on the perl license can be found in the perl source code which
3155 may be located via the www.perl.com web page.
3157 This is the most wonderfulest possible qsort I can come up with (and
3158 still be mostly portable) My (limited) tests indicate it consistently
3159 does about 20% fewer calls to compare than does the qsort in the Visual
3160 C++ library, other vendors may vary.
3162 Some of the ideas in here can be found in "Algorithms" by Sedgewick,
3163 others I invented myself (or more likely re-invented since they seemed
3164 pretty obvious once I watched the algorithm operate for a while).
3166 Most of this code was written while watching the Marlins sweep the Giants
3167 in the 1997 National League Playoffs - no Braves fans allowed to use this
3168 code (just kidding :-).
3170 I realize that if I wanted to be true to the perl tradition, the only
3171 comment in this file would be something like:
3173 ...they shuffled back towards the rear of the line. 'No, not at the
3174 rear!' the slave-driver shouted. 'Three files up. And stay there...
3176 However, I really needed to violate that tradition just so I could keep
3177 track of what happens myself, not to mention some poor fool trying to
3178 understand this years from now :-).
3181 /* ********************************************************** Configuration */
3183 #ifndef QSORT_ORDER_GUESS
3184 #define QSORT_ORDER_GUESS 2 /* Select doubling version of the netBSD trick */
3187 /* QSORT_MAX_STACK is the largest number of partitions that can be stacked up for
3188 future processing - a good max upper bound is log base 2 of memory size
3189 (32 on 32 bit machines, 64 on 64 bit machines, etc). In reality can
3190 safely be smaller than that since the program is taking up some space and
3191 most operating systems only let you grab some subset of contiguous
3192 memory (not to mention that you are normally sorting data larger than
3193 1 byte element size :-).
3195 #ifndef QSORT_MAX_STACK
3196 #define QSORT_MAX_STACK 32
3199 /* QSORT_BREAK_EVEN is the size of the largest partition we should insertion sort.
3200 Anything bigger and we use qsort. If you make this too small, the qsort
3201 will probably break (or become less efficient), because it doesn't expect
3202 the middle element of a partition to be the same as the right or left -
3203 you have been warned).
3205 #ifndef QSORT_BREAK_EVEN
3206 #define QSORT_BREAK_EVEN 6
3209 /* ************************************************************* Data Types */
3211 /* hold left and right index values of a partition waiting to be sorted (the
3212 partition includes both left and right - right is NOT one past the end or
3213 anything like that).
3215 struct partition_stack_entry {
3218 #ifdef QSORT_ORDER_GUESS
3219 int qsort_break_even;
3223 /* ******************************************************* Shorthand Macros */
3225 /* Note that these macros will be used from inside the qsort function where
3226 we happen to know that the variable 'elt_size' contains the size of an
3227 array element and the variable 'temp' points to enough space to hold a
3228 temp element and the variable 'array' points to the array being sorted
3229 and 'compare' is the pointer to the compare routine.
3231 Also note that there are very many highly architecture specific ways
3232 these might be sped up, but this is simply the most generally portable
3233 code I could think of.
3236 /* Return < 0 == 0 or > 0 as the value of elt1 is < elt2, == elt2, > elt2
3239 #define qsort_cmp(elt1, elt2) \
3240 ((this->*compare)(array[elt1], array[elt2]))
3242 #define qsort_cmp(elt1, elt2) \
3243 ((*compare)(array[elt1], array[elt2]))
3246 #ifdef QSORT_ORDER_GUESS
3247 #define QSORT_NOTICE_SWAP swapped++;
3249 #define QSORT_NOTICE_SWAP
3252 /* swaps contents of array elements elt1, elt2.
3254 #define qsort_swap(elt1, elt2) \
3257 temp = array[elt1]; \
3258 array[elt1] = array[elt2]; \
3259 array[elt2] = temp; \
3262 /* rotate contents of elt1, elt2, elt3 such that elt1 gets elt2, elt2 gets
3263 elt3 and elt3 gets elt1.
3265 #define qsort_rotate(elt1, elt2, elt3) \
3268 temp = array[elt1]; \
3269 array[elt1] = array[elt2]; \
3270 array[elt2] = array[elt3]; \
3271 array[elt3] = temp; \
3274 /* ************************************************************ Debug stuff */
3281 return; /* good place to set a breakpoint */
3284 #define qsort_assert(t) (void)( (t) || (break_here(), 0) )
3287 doqsort_all_asserts(
3291 int (*compare)(const void * elt1, const void * elt2),
3292 int pc_left, int pc_right, int u_left, int u_right)
3296 qsort_assert(pc_left <= pc_right);
3297 qsort_assert(u_right < pc_left);
3298 qsort_assert(pc_right < u_left);
3299 for (i = u_right + 1; i < pc_left; ++i) {
3300 qsort_assert(qsort_cmp(i, pc_left) < 0);
3302 for (i = pc_left; i < pc_right; ++i) {
3303 qsort_assert(qsort_cmp(i, pc_right) == 0);
3305 for (i = pc_right + 1; i < u_left; ++i) {
3306 qsort_assert(qsort_cmp(pc_right, i) < 0);
3310 #define qsort_all_asserts(PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT) \
3311 doqsort_all_asserts(array, num_elts, elt_size, compare, \
3312 PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT)
3316 #define qsort_assert(t) ((void)0)
3318 #define qsort_all_asserts(PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT) ((void)0)
3322 /* ****************************************************************** qsort */
3326 qsortsv(SV ** array, size_t num_elts, SVCOMPARE compare)
3331 I32 (*compare)(SV *a, SV *b))
3336 struct partition_stack_entry partition_stack[QSORT_MAX_STACK];
3337 int next_stack_entry = 0;
3341 #ifdef QSORT_ORDER_GUESS
3342 int qsort_break_even;
3346 /* Make sure we actually have work to do.
3348 if (num_elts <= 1) {
3352 /* Setup the initial partition definition and fall into the sorting loop
3355 part_right = (int)(num_elts - 1);
3356 #ifdef QSORT_ORDER_GUESS
3357 qsort_break_even = QSORT_BREAK_EVEN;
3359 #define qsort_break_even QSORT_BREAK_EVEN
3362 if ((part_right - part_left) >= qsort_break_even) {
3363 /* OK, this is gonna get hairy, so lets try to document all the
3364 concepts and abbreviations and variables and what they keep
3367 pc: pivot chunk - the set of array elements we accumulate in the
3368 middle of the partition, all equal in value to the original
3369 pivot element selected. The pc is defined by:
3371 pc_left - the leftmost array index of the pc
3372 pc_right - the rightmost array index of the pc
3374 we start with pc_left == pc_right and only one element
3375 in the pivot chunk (but it can grow during the scan).
3377 u: uncompared elements - the set of elements in the partition
3378 we have not yet compared to the pivot value. There are two
3379 uncompared sets during the scan - one to the left of the pc
3380 and one to the right.
3382 u_right - the rightmost index of the left side's uncompared set
3383 u_left - the leftmost index of the right side's uncompared set
3385 The leftmost index of the left sides's uncompared set
3386 doesn't need its own variable because it is always defined
3387 by the leftmost edge of the whole partition (part_left). The
3388 same goes for the rightmost edge of the right partition
3391 We know there are no uncompared elements on the left once we
3392 get u_right < part_left and no uncompared elements on the
3393 right once u_left > part_right. When both these conditions
3394 are met, we have completed the scan of the partition.
3396 Any elements which are between the pivot chunk and the
3397 uncompared elements should be less than the pivot value on
3398 the left side and greater than the pivot value on the right
3399 side (in fact, the goal of the whole algorithm is to arrange
3400 for that to be true and make the groups of less-than and
3401 greater-then elements into new partitions to sort again).
3403 As you marvel at the complexity of the code and wonder why it
3404 has to be so confusing. Consider some of the things this level
3405 of confusion brings:
3407 Once I do a compare, I squeeze every ounce of juice out of it. I
3408 never do compare calls I don't have to do, and I certainly never
3411 I also never swap any elements unless I can prove there is a
3412 good reason. Many sort algorithms will swap a known value with
3413 an uncompared value just to get things in the right place (or
3414 avoid complexity :-), but that uncompared value, once it gets
3415 compared, may then have to be swapped again. A lot of the
3416 complexity of this code is due to the fact that it never swaps
3417 anything except compared values, and it only swaps them when the
3418 compare shows they are out of position.
3420 int pc_left, pc_right;
3421 int u_right, u_left;
3425 pc_left = ((part_left + part_right) / 2);
3427 u_right = pc_left - 1;
3428 u_left = pc_right + 1;
3430 /* Qsort works best when the pivot value is also the median value
3431 in the partition (unfortunately you can't find the median value
3432 without first sorting :-), so to give the algorithm a helping
3433 hand, we pick 3 elements and sort them and use the median value
3434 of that tiny set as the pivot value.
3436 Some versions of qsort like to use the left middle and right as
3437 the 3 elements to sort so they can insure the ends of the
3438 partition will contain values which will stop the scan in the
3439 compare loop, but when you have to call an arbitrarily complex
3440 routine to do a compare, its really better to just keep track of
3441 array index values to know when you hit the edge of the
3442 partition and avoid the extra compare. An even better reason to
3443 avoid using a compare call is the fact that you can drop off the
3444 edge of the array if someone foolishly provides you with an
3445 unstable compare function that doesn't always provide consistent
3448 So, since it is simpler for us to compare the three adjacent
3449 elements in the middle of the partition, those are the ones we
3450 pick here (conveniently pointed at by u_right, pc_left, and
3451 u_left). The values of the left, center, and right elements
3452 are refered to as l c and r in the following comments.
3455 #ifdef QSORT_ORDER_GUESS
3458 s = qsort_cmp(u_right, pc_left);
3461 s = qsort_cmp(pc_left, u_left);
3462 /* if l < c, c < r - already in order - nothing to do */
3464 /* l < c, c == r - already in order, pc grows */
3466 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3468 /* l < c, c > r - need to know more */
3469 s = qsort_cmp(u_right, u_left);
3471 /* l < c, c > r, l < r - swap c & r to get ordered */
3472 qsort_swap(pc_left, u_left);
3473 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3474 } else if (s == 0) {
3475 /* l < c, c > r, l == r - swap c&r, grow pc */
3476 qsort_swap(pc_left, u_left);
3478 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3480 /* l < c, c > r, l > r - make lcr into rlc to get ordered */
3481 qsort_rotate(pc_left, u_right, u_left);
3482 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3485 } else if (s == 0) {
3487 s = qsort_cmp(pc_left, u_left);
3489 /* l == c, c < r - already in order, grow pc */
3491 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3492 } else if (s == 0) {
3493 /* l == c, c == r - already in order, grow pc both ways */
3496 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3498 /* l == c, c > r - swap l & r, grow pc */
3499 qsort_swap(u_right, u_left);
3501 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3505 s = qsort_cmp(pc_left, u_left);
3507 /* l > c, c < r - need to know more */
3508 s = qsort_cmp(u_right, u_left);
3510 /* l > c, c < r, l < r - swap l & c to get ordered */
3511 qsort_swap(u_right, pc_left);
3512 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3513 } else if (s == 0) {
3514 /* l > c, c < r, l == r - swap l & c, grow pc */
3515 qsort_swap(u_right, pc_left);
3517 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3519 /* l > c, c < r, l > r - rotate lcr into crl to order */
3520 qsort_rotate(u_right, pc_left, u_left);
3521 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3523 } else if (s == 0) {
3524 /* l > c, c == r - swap ends, grow pc */
3525 qsort_swap(u_right, u_left);
3527 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3529 /* l > c, c > r - swap ends to get in order */
3530 qsort_swap(u_right, u_left);
3531 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3534 /* We now know the 3 middle elements have been compared and
3535 arranged in the desired order, so we can shrink the uncompared
3540 qsort_all_asserts(pc_left, pc_right, u_left, u_right);
3542 /* The above massive nested if was the simple part :-). We now have
3543 the middle 3 elements ordered and we need to scan through the
3544 uncompared sets on either side, swapping elements that are on
3545 the wrong side or simply shuffling equal elements around to get
3546 all equal elements into the pivot chunk.
3550 int still_work_on_left;
3551 int still_work_on_right;
3553 /* Scan the uncompared values on the left. If I find a value
3554 equal to the pivot value, move it over so it is adjacent to
3555 the pivot chunk and expand the pivot chunk. If I find a value
3556 less than the pivot value, then just leave it - its already
3557 on the correct side of the partition. If I find a greater
3558 value, then stop the scan.
3560 while (still_work_on_left = (u_right >= part_left)) {
3561 s = qsort_cmp(u_right, pc_left);
3564 } else if (s == 0) {
3566 if (pc_left != u_right) {
3567 qsort_swap(u_right, pc_left);
3573 qsort_assert(u_right < pc_left);
3574 qsort_assert(pc_left <= pc_right);
3575 qsort_assert(qsort_cmp(u_right + 1, pc_left) <= 0);
3576 qsort_assert(qsort_cmp(pc_left, pc_right) == 0);
3579 /* Do a mirror image scan of uncompared values on the right
3581 while (still_work_on_right = (u_left <= part_right)) {
3582 s = qsort_cmp(pc_right, u_left);
3585 } else if (s == 0) {
3587 if (pc_right != u_left) {
3588 qsort_swap(pc_right, u_left);
3594 qsort_assert(u_left > pc_right);
3595 qsort_assert(pc_left <= pc_right);
3596 qsort_assert(qsort_cmp(pc_right, u_left - 1) <= 0);
3597 qsort_assert(qsort_cmp(pc_left, pc_right) == 0);
3600 if (still_work_on_left) {
3601 /* I know I have a value on the left side which needs to be
3602 on the right side, but I need to know more to decide
3603 exactly the best thing to do with it.
3605 if (still_work_on_right) {
3606 /* I know I have values on both side which are out of
3607 position. This is a big win because I kill two birds
3608 with one swap (so to speak). I can advance the
3609 uncompared pointers on both sides after swapping both
3610 of them into the right place.
3612 qsort_swap(u_right, u_left);
3615 qsort_all_asserts(pc_left, pc_right, u_left, u_right);
3617 /* I have an out of position value on the left, but the
3618 right is fully scanned, so I "slide" the pivot chunk
3619 and any less-than values left one to make room for the
3620 greater value over on the right. If the out of position
3621 value is immediately adjacent to the pivot chunk (there
3622 are no less-than values), I can do that with a swap,
3623 otherwise, I have to rotate one of the less than values
3624 into the former position of the out of position value
3625 and the right end of the pivot chunk into the left end
3629 if (pc_left == u_right) {
3630 qsort_swap(u_right, pc_right);
3631 qsort_all_asserts(pc_left, pc_right-1, u_left, u_right-1);
3633 qsort_rotate(u_right, pc_left, pc_right);
3634 qsort_all_asserts(pc_left, pc_right-1, u_left, u_right-1);
3639 } else if (still_work_on_right) {
3640 /* Mirror image of complex case above: I have an out of
3641 position value on the right, but the left is fully
3642 scanned, so I need to shuffle things around to make room
3643 for the right value on the left.
3646 if (pc_right == u_left) {
3647 qsort_swap(u_left, pc_left);
3648 qsort_all_asserts(pc_left+1, pc_right, u_left+1, u_right);
3650 qsort_rotate(pc_right, pc_left, u_left);
3651 qsort_all_asserts(pc_left+1, pc_right, u_left+1, u_right);
3656 /* No more scanning required on either side of partition,
3657 break out of loop and figure out next set of partitions
3663 /* The elements in the pivot chunk are now in the right place. They
3664 will never move or be compared again. All I have to do is decide
3665 what to do with the stuff to the left and right of the pivot
3668 Notes on the QSORT_ORDER_GUESS ifdef code:
3670 1. If I just built these partitions without swapping any (or
3671 very many) elements, there is a chance that the elements are
3672 already ordered properly (being properly ordered will
3673 certainly result in no swapping, but the converse can't be
3676 2. A (properly written) insertion sort will run faster on
3677 already ordered data than qsort will.
3679 3. Perhaps there is some way to make a good guess about
3680 switching to an insertion sort earlier than partition size 6
3681 (for instance - we could save the partition size on the stack
3682 and increase the size each time we find we didn't swap, thus
3683 switching to insertion sort earlier for partitions with a
3684 history of not swapping).
3686 4. Naturally, if I just switch right away, it will make
3687 artificial benchmarks with pure ascending (or descending)
3688 data look really good, but is that a good reason in general?
3692 #ifdef QSORT_ORDER_GUESS
3694 #if QSORT_ORDER_GUESS == 1
3695 qsort_break_even = (part_right - part_left) + 1;
3697 #if QSORT_ORDER_GUESS == 2
3698 qsort_break_even *= 2;
3700 #if QSORT_ORDER_GUESS == 3
3701 int prev_break = qsort_break_even;
3702 qsort_break_even *= qsort_break_even;
3703 if (qsort_break_even < prev_break) {
3704 qsort_break_even = (part_right - part_left) + 1;
3708 qsort_break_even = QSORT_BREAK_EVEN;
3712 if (part_left < pc_left) {
3713 /* There are elements on the left which need more processing.
3714 Check the right as well before deciding what to do.
3716 if (pc_right < part_right) {
3717 /* We have two partitions to be sorted. Stack the biggest one
3718 and process the smallest one on the next iteration. This
3719 minimizes the stack height by insuring that any additional
3720 stack entries must come from the smallest partition which
3721 (because it is smallest) will have the fewest
3722 opportunities to generate additional stack entries.
3724 if ((part_right - pc_right) > (pc_left - part_left)) {
3725 /* stack the right partition, process the left */
3726 partition_stack[next_stack_entry].left = pc_right + 1;
3727 partition_stack[next_stack_entry].right = part_right;
3728 #ifdef QSORT_ORDER_GUESS
3729 partition_stack[next_stack_entry].qsort_break_even = qsort_break_even;
3731 part_right = pc_left - 1;
3733 /* stack the left partition, process the right */
3734 partition_stack[next_stack_entry].left = part_left;
3735 partition_stack[next_stack_entry].right = pc_left - 1;
3736 #ifdef QSORT_ORDER_GUESS
3737 partition_stack[next_stack_entry].qsort_break_even = qsort_break_even;
3739 part_left = pc_right + 1;
3741 qsort_assert(next_stack_entry < QSORT_MAX_STACK);
3744 /* The elements on the left are the only remaining elements
3745 that need sorting, arrange for them to be processed as the
3748 part_right = pc_left - 1;
3750 } else if (pc_right < part_right) {
3751 /* There is only one chunk on the right to be sorted, make it
3752 the new partition and loop back around.
3754 part_left = pc_right + 1;
3756 /* This whole partition wound up in the pivot chunk, so
3757 we need to get a new partition off the stack.
3759 if (next_stack_entry == 0) {
3760 /* the stack is empty - we are done */
3764 part_left = partition_stack[next_stack_entry].left;
3765 part_right = partition_stack[next_stack_entry].right;
3766 #ifdef QSORT_ORDER_GUESS
3767 qsort_break_even = partition_stack[next_stack_entry].qsort_break_even;
3771 /* This partition is too small to fool with qsort complexity, just
3772 do an ordinary insertion sort to minimize overhead.
3775 /* Assume 1st element is in right place already, and start checking
3776 at 2nd element to see where it should be inserted.
3778 for (i = part_left + 1; i <= part_right; ++i) {
3780 /* Scan (backwards - just in case 'i' is already in right place)
3781 through the elements already sorted to see if the ith element
3782 belongs ahead of one of them.
3784 for (j = i - 1; j >= part_left; --j) {
3785 if (qsort_cmp(i, j) >= 0) {
3786 /* i belongs right after j
3793 /* Looks like we really need to move some things
3797 for (k = i - 1; k >= j; --k)
3798 array[k + 1] = array[k];
3803 /* That partition is now sorted, grab the next one, or get out
3804 of the loop if there aren't any more.
3807 if (next_stack_entry == 0) {
3808 /* the stack is empty - we are done */
3812 part_left = partition_stack[next_stack_entry].left;
3813 part_right = partition_stack[next_stack_entry].right;
3814 #ifdef QSORT_ORDER_GUESS
3815 qsort_break_even = partition_stack[next_stack_entry].qsort_break_even;
3820 /* Believe it or not, the array is sorted at this point! */