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#ifdef CAN_PROTOTYPE cleanup
[perl5.git] / pp_ctl.c
CommitLineData
a0d0e21e
LW		 1/* pp_ctl.c
2 *
9607fc9c 3 * Copyright (c) 1991-1997, Larry Wall
a0d0e21e
LW		 4 *
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.
7 *
8 */
9
10/*
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.
17 */
18
19#include "EXTERN.h"
20#include "perl.h"
21
22#ifndef WORD_ALIGN
23#define WORD_ALIGN sizeof(U16)
24#endif
25
54310121 26#define DOCATCH(o) ((CATCH_GET == TRUE) ? docatch(o) : (o))
1e422769 27
28static OP *docatch _((OP *o));
5dc0d613 29static OP *dofindlabel _((OP *o, char *label, OP **opstack, OP **oplimit));
a0d0e21e
LW		 30static void doparseform _((SV *sv));
31static I32 dopoptoeval _((I32 startingblock));
32static I32 dopoptolabel _((char *label));
33static I32 dopoptoloop _((I32 startingblock));
34static I32 dopoptosub _((I32 startingblock));
35static void save_lines _((AV *array, SV *sv));
745d3a65
HM		 36static I32 sortcv _((SV *a, SV *b));
37static void qsortsv _((SV **array, size_t num_elts, I32 (*fun)(SV *a, SV *b)));
c277df42 38static OP *doeval _((int gimme, OP** startop));
a0d0e21e
LW		 39
40static I32 sortcxix;
41
42PP(pp_wantarray)
43{
4e35701f 44 djSP;
a0d0e21e
LW		 45 I32 cxix;
46 EXTEND(SP, 1);
47
48 cxix = dopoptosub(cxstack_ix);
49 if (cxix < 0)
50 RETPUSHUNDEF;
51
54310121 52 switch (cxstack[cxix].blk_gimme) {
53 case G_ARRAY:
a0d0e21e 54 RETPUSHYES;
54310121 55 case G_SCALAR:
a0d0e21e 56 RETPUSHNO;
54310121 57 default:
58 RETPUSHUNDEF;
59 }
a0d0e21e
LW		 60}
61
62PP(pp_regcmaybe)
63{
64 return NORMAL;
65}
66
67PP(pp_regcomp) {
4e35701f 68 djSP;
a0d0e21e
LW		 69 register PMOP *pm = (PMOP*)cLOGOP->op_other;
70 register char *t;
71 SV *tmpstr;
72 STRLEN len;
c277df42 73 MAGIC *mg = Null(MAGIC*);
a0d0e21e
LW		 74
75 tmpstr = POPs;
c277df42
IZ		 76 if(SvROK(tmpstr)) {
77 SV *sv = SvRV(tmpstr);
78 if(SvMAGICAL(sv))
79 mg = mg_find(sv, 'r');
80 }
81 if(mg) {
82 regexp *re = (regexp *)mg->mg_obj;
83 ReREFCNT_dec(pm->op_pmregexp);
84 pm->op_pmregexp = ReREFCNT_inc(re);
85 }
86 else {
87 t = SvPV(tmpstr, len);
88
85aff577
CS		 89 /* JMR: Check against the last compiled regexp
90 To know for sure, we'd need the length of precomp.
91 But we don't have it, so we must ... take a guess. */
92 if (!pm->op_pmregexp || !pm->op_pmregexp->precomp ||
93 memNE(pm->op_pmregexp->precomp, t, len + 1))
94 {
c277df42
IZ		 95 if (pm->op_pmregexp) {
96 ReREFCNT_dec(pm->op_pmregexp);
97 pm->op_pmregexp = Null(REGEXP*); /* crucial if regcomp aborts */
98 }
a0d0e21e 99
c277df42
IZ		 100 pm->op_pmflags = pm->op_pmpermflags; /* reset case sensitivity */
101 pm->op_pmregexp = pregcomp(t, t + len, pm);
102 }
4633a7c4 103 }
a0d0e21e
LW		 104
105 if (!pm->op_pmregexp->prelen && curpm)
106 pm = curpm;
107 else if (strEQ("\\s+", pm->op_pmregexp->precomp))
108 pm->op_pmflags |= PMf_WHITE;
109
110 if (pm->op_pmflags & PMf_KEEP) {
c90c0ff4 111 pm->op_private &= ~OPpRUNTIME; /* no point compiling again */
a0d0e21e 112 cLOGOP->op_first->op_next = op->op_next;
a0d0e21e
LW		 113 }
114 RETURN;
115}
116
117PP(pp_substcont)
118{
4e35701f 119 djSP;
a0d0e21e 120 register PMOP *pm = (PMOP*) cLOGOP->op_other;
c09156bb 121 register PERL_CONTEXT *cx = &cxstack[cxstack_ix];
a0d0e21e
LW		 122 register SV *dstr = cx->sb_dstr;
123 register char *s = cx->sb_s;
124 register char *m = cx->sb_m;
125 char *orig = cx->sb_orig;
c07a80fd 126 register REGEXP *rx = cx->sb_rx;
a0d0e21e 127
c90c0ff4 128 rxres_restore(&cx->sb_rxres, rx);
129
a0d0e21e
LW		 130 if (cx->sb_iters++) {
131 if (cx->sb_iters > cx->sb_maxiters)
132 DIE("Substitution loop");
133
71be2cbc 134 if (!cx->sb_rxtainted)
135 cx->sb_rxtainted = SvTAINTED(TOPs);
a0d0e21e 136 sv_catsv(dstr, POPs);
a0d0e21e
LW		 137
138 /* Are we done */
c277df42
IZ		 139 if (cx->sb_once || !regexec_flags(rx, s, cx->sb_strend, orig,
140 s == m, Nullsv, NULL,
141 cx->sb_safebase ? 0 : REXEC_COPY_STR))
a0d0e21e
LW		 142 {
143 SV *targ = cx->sb_targ;
144 sv_catpvn(dstr, s, cx->sb_strend - s);
748a9306 145
c277df42 146 TAINT_IF(cx->sb_rxtainted || RX_MATCH_TAINTED(rx));
9212bbba 147
4633a7c4 148 (void)SvOOK_off(targ);
cb0b1708 149 Safefree(SvPVX(targ));
748a9306
LW		 150 SvPVX(targ) = SvPVX(dstr);
151 SvCUR_set(targ, SvCUR(dstr));
152 SvLEN_set(targ, SvLEN(dstr));
153 SvPVX(dstr) = 0;
154 sv_free(dstr);
a0d0e21e
LW		 155 (void)SvPOK_only(targ);
156 SvSETMAGIC(targ);
9212bbba 157 SvTAINT(targ);
5cd24f17 158
a0d0e21e 159 PUSHs(sv_2mortal(newSViv((I32)cx->sb_iters - 1)));
4633a7c4 160 LEAVE_SCOPE(cx->sb_oldsave);
a0d0e21e
LW		 161 POPSUBST(cx);
162 RETURNOP(pm->op_next);
163 }
164 }
165 if (rx->subbase && rx->subbase != orig) {
166 m = s;
167 s = orig;
168 cx->sb_orig = orig = rx->subbase;
169 s = orig + (m - s);
170 cx->sb_strend = s + (cx->sb_strend - m);
171 }
172 cx->sb_m = m = rx->startp[0];
173 sv_catpvn(dstr, s, m-s);
174 cx->sb_s = rx->endp[0];
c277df42 175 cx->sb_rxtainted |= RX_MATCH_TAINTED(rx);
c90c0ff4 176 rxres_save(&cx->sb_rxres, rx);
a0d0e21e
LW		 177 RETURNOP(pm->op_pmreplstart);
178}
179
c90c0ff4 180void
8ac85365 181rxres_save(void **rsp, REGEXP *rx)
c90c0ff4 182{
183 UV *p = (UV*)*rsp;
184 U32 i;
185
186 if (!p || p[1] < rx->nparens) {
187 i = 6 + rx->nparens * 2;
188 if (!p)
189 New(501, p, i, UV);
190 else
191 Renew(p, i, UV);
192 *rsp = (void*)p;
193 }
194
195 *p++ = (UV)rx->subbase;
196 rx->subbase = Nullch;
197
198 *p++ = rx->nparens;
199
200 *p++ = (UV)rx->subbeg;
201 *p++ = (UV)rx->subend;
202 for (i = 0; i <= rx->nparens; ++i) {
203 *p++ = (UV)rx->startp[i];
204 *p++ = (UV)rx->endp[i];
205 }
206}
207
208void
8ac85365 209rxres_restore(void **rsp, REGEXP *rx)
c90c0ff4 210{
211 UV *p = (UV*)*rsp;
212 U32 i;
213
214 Safefree(rx->subbase);
215 rx->subbase = (char*)(*p);
216 *p++ = 0;
217
218 rx->nparens = *p++;
219
220 rx->subbeg = (char*)(*p++);
221 rx->subend = (char*)(*p++);
222 for (i = 0; i <= rx->nparens; ++i) {
223 rx->startp[i] = (char*)(*p++);
224 rx->endp[i] = (char*)(*p++);
225 }
226}
227
228void
8ac85365 229rxres_free(void **rsp)
c90c0ff4 230{
231 UV *p = (UV*)*rsp;
232
233 if (p) {
234 Safefree((char*)(*p));
235 Safefree(p);
236 *rsp = Null(void*);
237 }
238}
239
a0d0e21e
LW		 240PP(pp_formline)
241{
4e35701f 242 djSP; dMARK; dORIGMARK;
a0d0e21e
LW		 243 register SV *form = *++MARK;
244 register U16 *fpc;
245 register char *t;
246 register char *f;
247 register char *s;
248 register char *send;
249 register I32 arg;
250 register SV *sv;
251 char *item;
252 I32 itemsize;
253 I32 fieldsize;
254 I32 lines = 0;
255 bool chopspace = (strchr(chopset, ' ') != Nullch);
256 char *chophere;
257 char *linemark;
a0d0e21e
LW		 258 double value;
259 bool gotsome;
260 STRLEN len;
261
55497cff 262 if (!SvMAGICAL(form) || !SvCOMPILED(form)) {
a0d0e21e
LW		 263 SvREADONLY_off(form);
264 doparseform(form);
265 }
266
267 SvPV_force(formtarget, len);
268 t = SvGROW(formtarget, len + SvCUR(form) + 1); /* XXX SvCUR bad */
269 t += len;
270 f = SvPV(form, len);
271 /* need to jump to the next word */
272 s = f + len + WORD_ALIGN - SvCUR(form) % WORD_ALIGN;
273
274 fpc = (U16*)s;
275
276 for (;;) {
277 DEBUG_f( {
278 char *name = "???";
279 arg = -1;
280 switch (*fpc) {
281 case FF_LITERAL: arg = fpc[1]; name = "LITERAL"; break;
282 case FF_BLANK: arg = fpc[1]; name = "BLANK"; break;
283 case FF_SKIP: arg = fpc[1]; name = "SKIP"; break;
284 case FF_FETCH: arg = fpc[1]; name = "FETCH"; break;
285 case FF_DECIMAL: arg = fpc[1]; name = "DECIMAL"; break;
286
287 case FF_CHECKNL: name = "CHECKNL"; break;
288 case FF_CHECKCHOP: name = "CHECKCHOP"; break;
289 case FF_SPACE: name = "SPACE"; break;
290 case FF_HALFSPACE: name = "HALFSPACE"; break;
291 case FF_ITEM: name = "ITEM"; break;
292 case FF_CHOP: name = "CHOP"; break;
293 case FF_LINEGLOB: name = "LINEGLOB"; break;
294 case FF_NEWLINE: name = "NEWLINE"; break;
295 case FF_MORE: name = "MORE"; break;
296 case FF_LINEMARK: name = "LINEMARK"; break;
297 case FF_END: name = "END"; break;
298 }
299 if (arg >= 0)
760ac839 300 PerlIO_printf(PerlIO_stderr(), "%-16s%ld\n", name, (long) arg);
a0d0e21e 301 else
760ac839 302 PerlIO_printf(PerlIO_stderr(), "%-16s\n", name);
a0d0e21e
LW		 303 } )
304 switch (*fpc++) {
305 case FF_LINEMARK:
306 linemark = t;
a0d0e21e
LW		 307 lines++;
308 gotsome = FALSE;
309 break;
310
311 case FF_LITERAL:
312 arg = *fpc++;
313 while (arg--)
314 *t++ = *f++;
315 break;
316
317 case FF_SKIP:
318 f += *fpc++;
319 break;
320
321 case FF_FETCH:
322 arg = *fpc++;
323 f += arg;
324 fieldsize = arg;
325
326 if (MARK < SP)
327 sv = *++MARK;
328 else {
329 sv = &sv_no;
330 if (dowarn)
331 warn("Not enough format arguments");
332 }
333 break;
334
335 case FF_CHECKNL:
336 item = s = SvPV(sv, len);
337 itemsize = len;
338 if (itemsize > fieldsize)
339 itemsize = fieldsize;
340 send = chophere = s + itemsize;
341 while (s < send) {
342 if (*s & ~31)
343 gotsome = TRUE;
344 else if (*s == '\n')
345 break;
346 s++;
347 }
348 itemsize = s - item;
349 break;
350
351 case FF_CHECKCHOP:
352 item = s = SvPV(sv, len);
353 itemsize = len;
354 if (itemsize <= fieldsize) {
355 send = chophere = s + itemsize;
356 while (s < send) {
357 if (*s == '\r') {
358 itemsize = s - item;
359 break;
360 }
361 if (*s++ & ~31)
362 gotsome = TRUE;
363 }
364 }
365 else {
366 itemsize = fieldsize;
367 send = chophere = s + itemsize;
368 while (s < send || (s == send && isSPACE(*s))) {
369 if (isSPACE(*s)) {
370 if (chopspace)
371 chophere = s;
372 if (*s == '\r')
373 break;
374 }
375 else {
376 if (*s & ~31)
377 gotsome = TRUE;
378 if (strchr(chopset, *s))
379 chophere = s + 1;
380 }
381 s++;
382 }
383 itemsize = chophere - item;
384 }
385 break;
386
387 case FF_SPACE:
388 arg = fieldsize - itemsize;
389 if (arg) {
390 fieldsize -= arg;
391 while (arg-- > 0)
392 *t++ = ' ';
393 }
394 break;
395
396 case FF_HALFSPACE:
397 arg = fieldsize - itemsize;
398 if (arg) {
399 arg /= 2;
400 fieldsize -= arg;
401 while (arg-- > 0)
402 *t++ = ' ';
403 }
404 break;
405
406 case FF_ITEM:
407 arg = itemsize;
408 s = item;
409 while (arg--) {
410#if 'z' - 'a' != 25
411 int ch = *t++ = *s++;
412 if (!iscntrl(ch))
413 t[-1] = ' ';
414#else
415 if ( !((*t++ = *s++) & ~31) )
416 t[-1] = ' ';
417#endif
418
419 }
420 break;
421
422 case FF_CHOP:
423 s = chophere;
424 if (chopspace) {
425 while (*s && isSPACE(*s))
426 s++;
427 }
428 sv_chop(sv,s);
429 break;
430
431 case FF_LINEGLOB:
432 item = s = SvPV(sv, len);
433 itemsize = len;
434 if (itemsize) {
435 gotsome = TRUE;
436 send = s + itemsize;
437 while (s < send) {
438 if (*s++ == '\n') {
439 if (s == send)
440 itemsize--;
441 else
442 lines++;
443 }
444 }
445 SvCUR_set(formtarget, t - SvPVX(formtarget));
446 sv_catpvn(formtarget, item, itemsize);
447 SvGROW(formtarget, SvCUR(formtarget) + SvCUR(form) + 1);
448 t = SvPVX(formtarget) + SvCUR(formtarget);
449 }
450 break;
451
452 case FF_DECIMAL:
453 /* If the field is marked with ^ and the value is undefined,
454 blank it out. */
455 arg = *fpc++;
456 if ((arg & 512) && !SvOK(sv)) {
457 arg = fieldsize;
458 while (arg--)
459 *t++ = ' ';
460 break;
461 }
462 gotsome = TRUE;
463 value = SvNV(sv);
bbce6d69 464 /* Formats aren't yet marked for locales, so assume "yes". */
36477c24 465 SET_NUMERIC_LOCAL();
a0d0e21e
LW		 466 if (arg & 256) {
467 sprintf(t, "%#*.*f", (int) fieldsize, (int) arg & 255, value);
468 } else {
469 sprintf(t, "%*.0f", (int) fieldsize, value);
470 }
471 t += fieldsize;
472 break;
473
474 case FF_NEWLINE:
475 f++;
476 while (t-- > linemark && *t == ' ') ;
477 t++;
478 *t++ = '\n';
479 break;
480
481 case FF_BLANK:
482 arg = *fpc++;
483 if (gotsome) {
484 if (arg) { /* repeat until fields exhausted? */
485 *t = '\0';
486 SvCUR_set(formtarget, t - SvPVX(formtarget));
487 lines += FmLINES(formtarget);
488 if (lines == 200) {
489 arg = t - linemark;
490 if (strnEQ(linemark, linemark - arg, arg))
491 DIE("Runaway format");
492 }
493 FmLINES(formtarget) = lines;
494 SP = ORIGMARK;
495 RETURNOP(cLISTOP->op_first);
496 }
497 }
498 else {
499 t = linemark;
500 lines--;
501 }
502 break;
503
504 case FF_MORE:
505 if (itemsize) {
506 arg = fieldsize - itemsize;
507 if (arg) {
508 fieldsize -= arg;
509 while (arg-- > 0)
510 *t++ = ' ';
511 }
512 s = t - 3;
513 if (strnEQ(s," ",3)) {
514 while (s > SvPVX(formtarget) && isSPACE(s[-1]))
515 s--;
516 }
517 *s++ = '.';
518 *s++ = '.';
519 *s++ = '.';
520 }
521 break;
522
523 case FF_END:
524 *t = '\0';
525 SvCUR_set(formtarget, t - SvPVX(formtarget));
526 FmLINES(formtarget) += lines;
527 SP = ORIGMARK;
528 RETPUSHYES;
529 }
530 }
531}
532
533PP(pp_grepstart)
534{
4e35701f 535 djSP;
a0d0e21e
LW		 536 SV *src;
537
538 if (stack_base + *markstack_ptr == sp) {
539 (void)POPMARK;
54310121 540 if (GIMME_V == G_SCALAR)
a0d0e21e
LW		 541 XPUSHs(&sv_no);
542 RETURNOP(op->op_next->op_next);
543 }
544 stack_sp = stack_base + *markstack_ptr + 1;
11343788
MB		 545 pp_pushmark(ARGS); /* push dst */
546 pp_pushmark(ARGS); /* push src */
a0d0e21e
LW		 547 ENTER; /* enter outer scope */
548
549 SAVETMPS;
fb54173c
MB		 550#ifdef USE_THREADS
551 /* SAVE_DEFSV does *not* suffice here */
940cb80d 552 save_sptr(&THREADSV(0));
fb54173c
MB		 553#else
554 SAVESPTR(GvSV(defgv));
555#endif /* USE_THREADS */
a0d0e21e
LW		 556 ENTER; /* enter inner scope */
557 SAVESPTR(curpm);
558
559 src = stack_base[*markstack_ptr];
560 SvTEMP_off(src);
54b9620d 561 DEFSV = src;
a0d0e21e
LW		 562
563 PUTBACK;
564 if (op->op_type == OP_MAPSTART)
11343788 565 pp_pushmark(ARGS); /* push top */
a0d0e21e
LW		 566 return ((LOGOP*)op->op_next)->op_other;
567}
568
569PP(pp_mapstart)
570{
571 DIE("panic: mapstart"); /* uses grepstart */
572}
573
574PP(pp_mapwhile)
575{
4e35701f 576 djSP;
a0d0e21e
LW		 577 I32 diff = (sp - stack_base) - *markstack_ptr;
578 I32 count;
579 I32 shift;
580 SV** src;
581 SV** dst;
582
583 ++markstack_ptr[-1];
584 if (diff) {
585 if (diff > markstack_ptr[-1] - markstack_ptr[-2]) {
586 shift = diff - (markstack_ptr[-1] - markstack_ptr[-2]);
587 count = (sp - stack_base) - markstack_ptr[-1] + 2;
588
589 EXTEND(sp,shift);
590 src = sp;
591 dst = (sp += shift);
592 markstack_ptr[-1] += shift;
593 *markstack_ptr += shift;
594 while (--count)
595 *dst-- = *src--;
596 }
597 dst = stack_base + (markstack_ptr[-2] += diff) - 1;
598 ++diff;
599 while (--diff)
600 *dst-- = SvTEMP(TOPs) ? POPs : sv_mortalcopy(POPs);
601 }
602 LEAVE; /* exit inner scope */
603
604 /* All done yet? */
605 if (markstack_ptr[-1] > *markstack_ptr) {
606 I32 items;
54310121 607 I32 gimme = GIMME_V;
a0d0e21e
LW		 608
609 (void)POPMARK; /* pop top */
610 LEAVE; /* exit outer scope */
611 (void)POPMARK; /* pop src */
612 items = --*markstack_ptr - markstack_ptr[-1];
613 (void)POPMARK; /* pop dst */
614 SP = stack_base + POPMARK; /* pop original mark */
54310121 615 if (gimme == G_SCALAR) {
a0d0e21e
LW		 616 dTARGET;
617 XPUSHi(items);
a0d0e21e 618 }
54310121 619 else if (gimme == G_ARRAY)
620 SP += items;
a0d0e21e
LW		 621 RETURN;
622 }
623 else {
624 SV *src;
625
626 ENTER; /* enter inner scope */
627 SAVESPTR(curpm);
628
629 src = stack_base[markstack_ptr[-1]];
630 SvTEMP_off(src);
54b9620d 631 DEFSV = src;
a0d0e21e
LW		 632
633 RETURNOP(cLOGOP->op_other);
634 }
635}
636
637
638PP(pp_sort)
639{
4e35701f 640 djSP; dMARK; dORIGMARK;
a0d0e21e
LW		 641 register SV **up;
642 SV **myorigmark = ORIGMARK;
643 register I32 max;
644 HV *stash;
645 GV *gv;
646 CV *cv;
647 I32 gimme = GIMME;
648 OP* nextop = op->op_next;
649
650 if (gimme != G_ARRAY) {
651 SP = MARK;
652 RETPUSHUNDEF;
653 }
654
655 if (op->op_flags & OPf_STACKED) {
656 ENTER;
657 if (op->op_flags & OPf_SPECIAL) {
658 OP *kid = cLISTOP->op_first->op_sibling; /* pass pushmark */
659 kid = kUNOP->op_first; /* pass rv2gv */
660 kid = kUNOP->op_first; /* pass leave */
661 sortcop = kid->op_next;
662 stash = curcop->cop_stash;
663 }
664 else {
665 cv = sv_2cv(*++MARK, &stash, &gv, 0);
666 if (!(cv && CvROOT(cv))) {
667 if (gv) {
668 SV *tmpstr = sv_newmortal();
e5cf08de 669 gv_efullname3(tmpstr, gv, Nullch);
a0d0e21e
LW		 670 if (cv && CvXSUB(cv))
671 DIE("Xsub \"%s\" called in sort", SvPVX(tmpstr));
672 DIE("Undefined sort subroutine \"%s\" called",
673 SvPVX(tmpstr));
674 }
675 if (cv) {
676 if (CvXSUB(cv))
677 DIE("Xsub called in sort");
678 DIE("Undefined subroutine in sort");
679 }
680 DIE("Not a CODE reference in sort");
681 }
682 sortcop = CvSTART(cv);
683 SAVESPTR(CvROOT(cv)->op_ppaddr);
684 CvROOT(cv)->op_ppaddr = ppaddr[OP_NULL];
b3933176 685
a0d0e21e
LW		 686 SAVESPTR(curpad);
687 curpad = AvARRAY((AV*)AvARRAY(CvPADLIST(cv))[1]);
688 }
689 }
690 else {
691 sortcop = Nullop;
692 stash = curcop->cop_stash;
693 }
694
695 up = myorigmark + 1;
696 while (MARK < SP) { /* This may or may not shift down one here. */
697 /*SUPPRESS 560*/
698 if (*up = *++MARK) { /* Weed out nulls. */
9f8d30d5
CS		 699 SvTEMP_off(*up);
700 if (!sortcop && !SvPOK(*up))
a0d0e21e 701 (void)sv_2pv(*up, &na);
a0d0e21e
LW		 702 up++;
703 }
704 }
705 max = --up - myorigmark;
706 if (sortcop) {
707 if (max > 1) {
708 AV *oldstack;
c09156bb 709 PERL_CONTEXT *cx;
a0d0e21e 710 SV** newsp;
54310121 711 bool oldcatch = CATCH_GET;
a0d0e21e
LW		 712
713 SAVETMPS;
462e5cf6 714 SAVEOP();
a0d0e21e 715
1ce6579f 716 oldstack = curstack;
a0d0e21e
LW		 717 if (!sortstack) {
718 sortstack = newAV();
719 AvREAL_off(sortstack);
720 av_extend(sortstack, 32);
721 }
54310121 722 CATCH_SET(TRUE);
1ce6579f 723 SWITCHSTACK(curstack, sortstack);
a0d0e21e
LW		 724 if (sortstash != stash) {
725 firstgv = gv_fetchpv("a", TRUE, SVt_PV);
726 secondgv = gv_fetchpv("b", TRUE, SVt_PV);
727 sortstash = stash;
728 }
729
730 SAVESPTR(GvSV(firstgv));
731 SAVESPTR(GvSV(secondgv));
b3933176 732
0a753a76 733 PUSHBLOCK(cx, CXt_NULL, stack_base);
b3933176
CS		 734 if (!(op->op_flags & OPf_SPECIAL)) {
735 bool hasargs = FALSE;
736 cx->cx_type = CXt_SUB;
737 cx->blk_gimme = G_SCALAR;
738 PUSHSUB(cx);
739 if (!CvDEPTH(cv))
3e3baf6d 740 (void)SvREFCNT_inc(cv); /* in preparation for POPSUB */
b3933176 741 }
a0d0e21e
LW		 742 sortcxix = cxstack_ix;
743
745d3a65 744 qsortsv(myorigmark+1, max, sortcv);
a0d0e21e
LW		 745
746 POPBLOCK(cx,curpm);
747 SWITCHSTACK(sortstack, oldstack);
54310121 748 CATCH_SET(oldcatch);
a0d0e21e
LW		 749 }
750 LEAVE;
751 }
752 else {
753 if (max > 1) {
754 MEXTEND(SP, 20); /* Can't afford stack realloc on signal. */
745d3a65
HM		 755 qsortsv(ORIGMARK+1, max,
756 (op->op_private & OPpLOCALE) ? sv_cmp_locale : sv_cmp);
a0d0e21e
LW		 757 }
758 }
759 stack_sp = ORIGMARK + max;
760 return nextop;
761}
762
763/* Range stuff. */
764
765PP(pp_range)
766{
767 if (GIMME == G_ARRAY)
768 return cCONDOP->op_true;
769 return SvTRUEx(PAD_SV(op->op_targ)) ? cCONDOP->op_false : cCONDOP->op_true;
770}
771
772PP(pp_flip)
773{
4e35701f 774 djSP;
a0d0e21e
LW		 775
776 if (GIMME == G_ARRAY) {
777 RETURNOP(((CONDOP*)cUNOP->op_first)->op_false);
778 }
779 else {
780 dTOPss;
781 SV *targ = PAD_SV(op->op_targ);
782
783 if ((op->op_private & OPpFLIP_LINENUM)
784 ? last_in_gv && SvIV(sv) == IoLINES(GvIOp(last_in_gv))
785 : SvTRUE(sv) ) {
786 sv_setiv(PAD_SV(cUNOP->op_first->op_targ), 1);
787 if (op->op_flags & OPf_SPECIAL) {
788 sv_setiv(targ, 1);
3e3baf6d 789 SETs(targ);
a0d0e21e
LW		 790 RETURN;
791 }
792 else {
793 sv_setiv(targ, 0);
794 sp--;
795 RETURNOP(((CONDOP*)cUNOP->op_first)->op_false);
796 }
797 }
798 sv_setpv(TARG, "");
799 SETs(targ);
800 RETURN;
801 }
802}
803
804PP(pp_flop)
805{
4e35701f 806 djSP;
a0d0e21e
LW		 807
808 if (GIMME == G_ARRAY) {
809 dPOPPOPssrl;
810 register I32 i;
811 register SV *sv;
812 I32 max;
813
4633a7c4 814 if (SvNIOKp(left) || !SvPOKp(left) ||
bbce6d69 815 (looks_like_number(left) && *SvPVX(left) != '0') )
816 {
a0d0e21e
LW		 817 i = SvIV(left);
818 max = SvIV(right);
bbce6d69 819 if (max >= i) {
820 EXTEND_MORTAL(max - i + 1);
a0d0e21e 821 EXTEND(SP, max - i + 1);
bbce6d69 822 }
a0d0e21e 823 while (i <= max) {
bbce6d69 824 sv = sv_2mortal(newSViv(i++));
a0d0e21e
LW		 825 PUSHs(sv);
826 }
827 }
828 else {
829 SV *final = sv_mortalcopy(right);
830 STRLEN len;
831 char *tmps = SvPV(final, len);
832
833 sv = sv_mortalcopy(left);
4633a7c4 834 while (!SvNIOKp(sv) && SvCUR(sv) <= len &&
a0d0e21e
LW		 835 strNE(SvPVX(sv),tmps) ) {
836 XPUSHs(sv);
837 sv = sv_2mortal(newSVsv(sv));
838 sv_inc(sv);
839 }
840 if (strEQ(SvPVX(sv),tmps))
841 XPUSHs(sv);
842 }
843 }
844 else {
845 dTOPss;
846 SV *targ = PAD_SV(cUNOP->op_first->op_targ);
847 sv_inc(targ);
848 if ((op->op_private & OPpFLIP_LINENUM)
849 ? last_in_gv && SvIV(sv) == IoLINES(GvIOp(last_in_gv))
850 : SvTRUE(sv) ) {
851 sv_setiv(PAD_SV(((UNOP*)cUNOP->op_first)->op_first->op_targ), 0);
852 sv_catpv(targ, "E0");
853 }
854 SETs(targ);
855 }
856
857 RETURN;
858}
859
860/* Control. */
861
862static I32
8ac85365 863dopoptolabel(char *label)
a0d0e21e 864{
11343788 865 dTHR;
a0d0e21e 866 register I32 i;
c09156bb 867 register PERL_CONTEXT *cx;
a0d0e21e
LW		 868
869 for (i = cxstack_ix; i >= 0; i--) {
870 cx = &cxstack[i];
871 switch (cx->cx_type) {
872 case CXt_SUBST:
873 if (dowarn)
874 warn("Exiting substitution via %s", op_name[op->op_type]);
875 break;
876 case CXt_SUB:
877 if (dowarn)
878 warn("Exiting subroutine via %s", op_name[op->op_type]);
879 break;
880 case CXt_EVAL:
881 if (dowarn)
882 warn("Exiting eval via %s", op_name[op->op_type]);
883 break;
0a753a76 884 case CXt_NULL:
885 if (dowarn)
886 warn("Exiting pseudo-block via %s", op_name[op->op_type]);
887 return -1;
a0d0e21e
LW		 888 case CXt_LOOP:
889 if (!cx->blk_loop.label ||
890 strNE(label, cx->blk_loop.label) ) {
68dc0745 891 DEBUG_l(deb("(Skipping label #%ld %s)\n",
892 (long)i, cx->blk_loop.label));
a0d0e21e
LW		 893 continue;
894 }
68dc0745 895 DEBUG_l( deb("(Found label #%ld %s)\n", (long)i, label));
a0d0e21e
LW		 896 return i;
897 }
898 }
899 return i;
900}
901
e50aee73 902I32
8ac85365 903dowantarray(void)
e50aee73 904{
54310121 905 I32 gimme = block_gimme();
906 return (gimme == G_VOID) ? G_SCALAR : gimme;
907}
908
909I32
8ac85365 910block_gimme(void)
54310121 911{
11343788 912 dTHR;
e50aee73
AD		 913 I32 cxix;
914
915 cxix = dopoptosub(cxstack_ix);
916 if (cxix < 0)
46fc3d4c 917 return G_VOID;
e50aee73 918
54310121 919 switch (cxstack[cxix].blk_gimme) {
54310121 920 case G_SCALAR:
e50aee73 921 return G_SCALAR;
54310121 922 case G_ARRAY:
923 return G_ARRAY;
924 default:
925 croak("panic: bad gimme: %d\n", cxstack[cxix].blk_gimme);
4e35701f
NIS		 926 case G_VOID:
927 return G_VOID;
54310121 928 }
e50aee73
AD		 929}
930
a0d0e21e 931static I32
8ac85365 932dopoptosub(I32 startingblock)
a0d0e21e 933{
11343788 934 dTHR;
a0d0e21e 935 I32 i;
c09156bb 936 register PERL_CONTEXT *cx;
a0d0e21e
LW		 937 for (i = startingblock; i >= 0; i--) {
938 cx = &cxstack[i];
939 switch (cx->cx_type) {
940 default:
941 continue;
942 case CXt_EVAL:
943 case CXt_SUB:
68dc0745 944 DEBUG_l( deb("(Found sub #%ld)\n", (long)i));
a0d0e21e
LW		 945 return i;
946 }
947 }
948 return i;
949}
950
951static I32
8ac85365 952dopoptoeval(I32 startingblock)
a0d0e21e 953{
11343788 954 dTHR;
a0d0e21e 955 I32 i;
c09156bb 956 register PERL_CONTEXT *cx;
a0d0e21e
LW		 957 for (i = startingblock; i >= 0; i--) {
958 cx = &cxstack[i];
959 switch (cx->cx_type) {
960 default:
961 continue;
962 case CXt_EVAL:
68dc0745 963 DEBUG_l( deb("(Found eval #%ld)\n", (long)i));
a0d0e21e
LW		 964 return i;
965 }
966 }
967 return i;
968}
969
970static I32
8ac85365 971dopoptoloop(I32 startingblock)
a0d0e21e 972{
11343788 973 dTHR;
a0d0e21e 974 I32 i;
c09156bb 975 register PERL_CONTEXT *cx;
a0d0e21e
LW		 976 for (i = startingblock; i >= 0; i--) {
977 cx = &cxstack[i];
978 switch (cx->cx_type) {
979 case CXt_SUBST:
980 if (dowarn)
5f05dabc 981 warn("Exiting substitution via %s", op_name[op->op_type]);
a0d0e21e
LW		 982 break;
983 case CXt_SUB:
984 if (dowarn)
985 warn("Exiting subroutine via %s", op_name[op->op_type]);
986 break;
987 case CXt_EVAL:
988 if (dowarn)
989 warn("Exiting eval via %s", op_name[op->op_type]);
990 break;
0a753a76 991 case CXt_NULL:
992 if (dowarn)
993 warn("Exiting pseudo-block via %s", op_name[op->op_type]);
994 return -1;
a0d0e21e 995 case CXt_LOOP:
68dc0745 996 DEBUG_l( deb("(Found loop #%ld)\n", (long)i));
a0d0e21e
LW		 997 return i;
998 }
999 }
1000 return i;
1001}
1002
1003void
8ac85365 1004dounwind(I32 cxix)
a0d0e21e 1005{
11343788 1006 dTHR;
c09156bb 1007 register PERL_CONTEXT *cx;
a0d0e21e
LW		 1008 SV **newsp;
1009 I32 optype;
1010
1011 while (cxstack_ix > cxix) {
c90c0ff4 1012 cx = &cxstack[cxstack_ix];
1013 DEBUG_l(PerlIO_printf(Perl_debug_log, "Unwinding block %ld, type %s\n",
301d9039 1014 (long) cxstack_ix, block_type[cx->cx_type]));
a0d0e21e
LW		 1015 /* Note: we don't need to restore the base context info till the end. */
1016 switch (cx->cx_type) {
c90c0ff4 1017 case CXt_SUBST:
1018 POPSUBST(cx);
1019 continue; /* not break */
a0d0e21e
LW		 1020 case CXt_SUB:
1021 POPSUB(cx);
1022 break;
1023 case CXt_EVAL:
1024 POPEVAL(cx);
1025 break;
1026 case CXt_LOOP:
1027 POPLOOP(cx);
1028 break;
0a753a76 1029 case CXt_NULL:
a0d0e21e
LW		 1030 break;
1031 }
c90c0ff4 1032 cxstack_ix--;
a0d0e21e
LW		 1033 }
1034}
1035
a0d0e21e 1036OP *
8ac85365 1037die_where(char *message)
a0d0e21e 1038{
11343788 1039 dTHR;
a0d0e21e
LW		 1040 if (in_eval) {
1041 I32 cxix;
c09156bb 1042 register PERL_CONTEXT *cx;
a0d0e21e
LW		 1043 I32 gimme;
1044 SV **newsp;
1045
4633a7c4
LW		 1046 if (in_eval & 4) {
1047 SV **svp;
1048 STRLEN klen = strlen(message);
1049
38a03e6e 1050 svp = hv_fetch(ERRHV, message, klen, TRUE);
4633a7c4
LW		 1051 if (svp) {
1052 if (!SvIOK(*svp)) {
1053 static char prefix[] = "\t(in cleanup) ";
e41fc98b 1054 SV *err = ERRSV;
4633a7c4
LW		 1055 sv_upgrade(*svp, SVt_IV);
1056 (void)SvIOK_only(*svp);
e41fc98b
GS		 1057 if (!SvPOK(err))
1058 sv_setpv(err,"");
1059 SvGROW(err, SvCUR(err)+sizeof(prefix)+klen);
1060 sv_catpvn(err, prefix, sizeof(prefix)-1);
1061 sv_catpvn(err, message, klen);
4633a7c4
LW		 1062 }
1063 sv_inc(*svp);
1064 }
1065 }
1066 else
38a03e6e 1067 sv_setpv(ERRSV, message);
4633a7c4 1068
a0d0e21e
LW		 1069 cxix = dopoptoeval(cxstack_ix);
1070 if (cxix >= 0) {
1071 I32 optype;
1072
1073 if (cxix < cxstack_ix)
1074 dounwind(cxix);
1075
1076 POPBLOCK(cx,curpm);
1077 if (cx->cx_type != CXt_EVAL) {
760ac839 1078 PerlIO_printf(PerlIO_stderr(), "panic: die %s", message);
a0d0e21e
LW		 1079 my_exit(1);
1080 }
1081 POPEVAL(cx);
1082
1083 if (gimme == G_SCALAR)
1084 *++newsp = &sv_undef;
1085 stack_sp = newsp;
1086
1087 LEAVE;
748a9306 1088
7a2e2cd6 1089 if (optype == OP_REQUIRE) {
38a03e6e 1090 char* msg = SvPVx(ERRSV, na);
7a2e2cd6 1091 DIE("%s", *msg ? msg : "Compilation failed in require");
1092 }
a0d0e21e
LW		 1093 return pop_return();
1094 }
1095 }
760ac839
LW		 1096 PerlIO_printf(PerlIO_stderr(), "%s",message);
1097 PerlIO_flush(PerlIO_stderr());
f86702cc 1098 my_failure_exit();
1099 /* NOTREACHED */
a0d0e21e
LW		 1100 return 0;
1101}
1102
1103PP(pp_xor)
1104{
4e35701f 1105 djSP; dPOPTOPssrl;
a0d0e21e
LW		 1106 if (SvTRUE(left) != SvTRUE(right))
1107 RETSETYES;
1108 else
1109 RETSETNO;
1110}
1111
1112PP(pp_andassign)
1113{
4e35701f 1114 djSP;
a0d0e21e
LW		 1115 if (!SvTRUE(TOPs))
1116 RETURN;
1117 else
1118 RETURNOP(cLOGOP->op_other);
1119}
1120
1121PP(pp_orassign)
1122{
4e35701f 1123 djSP;
a0d0e21e
LW		 1124 if (SvTRUE(TOPs))
1125 RETURN;
1126 else
1127 RETURNOP(cLOGOP->op_other);
1128}
1129
a0d0e21e
LW		 1130PP(pp_caller)
1131{
4e35701f 1132 djSP;
a0d0e21e 1133 register I32 cxix = dopoptosub(cxstack_ix);
c09156bb 1134 register PERL_CONTEXT *cx;
a0d0e21e 1135 I32 dbcxix;
54310121 1136 I32 gimme;
49d8d3a1 1137 HV *hv;
a0d0e21e
LW		 1138 SV *sv;
1139 I32 count = 0;
1140
1141 if (MAXARG)
1142 count = POPi;
1143 EXTEND(SP, 6);
1144 for (;;) {
1145 if (cxix < 0) {
1146 if (GIMME != G_ARRAY)
1147 RETPUSHUNDEF;
1148 RETURN;
1149 }
1150 if (DBsub && cxix >= 0 &&
1151 cxstack[cxix].blk_sub.cv == GvCV(DBsub))
1152 count++;
1153 if (!count--)
1154 break;
1155 cxix = dopoptosub(cxix - 1);
1156 }
1157 cx = &cxstack[cxix];
06a5b730 1158 if (cxstack[cxix].cx_type == CXt_SUB) {
1159 dbcxix = dopoptosub(cxix - 1);
1160 /* We expect that cxstack[dbcxix] is CXt_SUB, anyway, the
1161 field below is defined for any cx. */
1162 if (DBsub && dbcxix >= 0 && cxstack[dbcxix].blk_sub.cv == GvCV(DBsub))
1163 cx = &cxstack[dbcxix];
1164 }
1165
a0d0e21e 1166 if (GIMME != G_ARRAY) {
49d8d3a1
MB		 1167 hv = cx->blk_oldcop->cop_stash;
1168 if (!hv)
1169 PUSHs(&sv_undef);
1170 else {
1171 dTARGET;
1172 sv_setpv(TARG, HvNAME(hv));
1173 PUSHs(TARG);
1174 }
a0d0e21e
LW		 1175 RETURN;
1176 }
a0d0e21e 1177
49d8d3a1
MB		 1178 hv = cx->blk_oldcop->cop_stash;
1179 if (!hv)
1180 PUSHs(&sv_undef);
1181 else
1182 PUSHs(sv_2mortal(newSVpv(HvNAME(hv), 0)));
a0d0e21e
LW		 1183 PUSHs(sv_2mortal(newSVpv(SvPVX(GvSV(cx->blk_oldcop->cop_filegv)), 0)));
1184 PUSHs(sv_2mortal(newSViv((I32)cx->blk_oldcop->cop_line)));
1185 if (!MAXARG)
1186 RETURN;
06a5b730 1187 if (cx->cx_type == CXt_SUB) { /* So is cxstack[dbcxix]. */
a0d0e21e 1188 sv = NEWSV(49, 0);
e5cf08de 1189 gv_efullname3(sv, CvGV(cxstack[cxix].blk_sub.cv), Nullch);
a0d0e21e
LW		 1190 PUSHs(sv_2mortal(sv));
1191 PUSHs(sv_2mortal(newSViv((I32)cx->blk_sub.hasargs)));
1192 }
1193 else {
1194 PUSHs(sv_2mortal(newSVpv("(eval)",0)));
1195 PUSHs(sv_2mortal(newSViv(0)));
1196 }
54310121 1197 gimme = (I32)cx->blk_gimme;
1198 if (gimme == G_VOID)
1199 PUSHs(&sv_undef);
1200 else
1201 PUSHs(sv_2mortal(newSViv(gimme & G_ARRAY)));
4633a7c4 1202 if (cx->cx_type == CXt_EVAL) {
06a5b730 1203 if (cx->blk_eval.old_op_type == OP_ENTEREVAL) {
4633a7c4 1204 PUSHs(cx->blk_eval.cur_text);
06a5b730 1205 PUSHs(&sv_no);
1206 }
1207 else if (cx->blk_eval.old_name) { /* Try blocks have old_name == 0. */
1208 /* Require, put the name. */
1209 PUSHs(sv_2mortal(newSVpv(cx->blk_eval.old_name, 0)));
1210 PUSHs(&sv_yes);
1211 }
4633a7c4
LW		 1212 }
1213 else if (cx->cx_type == CXt_SUB &&
1214 cx->blk_sub.hasargs &&
1215 curcop->cop_stash == debstash)
1216 {
a0d0e21e
LW		 1217 AV *ary = cx->blk_sub.argarray;
1218 int off = AvARRAY(ary) - AvALLOC(ary);
1219
1220 if (!dbargs) {
1221 GV* tmpgv;
1222 dbargs = GvAV(gv_AVadd(tmpgv = gv_fetchpv("DB::args", TRUE,
1223 SVt_PVAV)));
a5f75d66 1224 GvMULTI_on(tmpgv);
a0d0e21e
LW		 1225 AvREAL_off(dbargs); /* XXX Should be REIFY */
1226 }
1227
93965878
NIS		 1228 if (AvMAX(dbargs) < AvFILLp(ary) + off)
1229 av_extend(dbargs, AvFILLp(ary) + off);
1230 Copy(AvALLOC(ary), AvARRAY(dbargs), AvFILLp(ary) + 1 + off, SV*);
1231 AvFILLp(dbargs) = AvFILLp(ary) + off;
a0d0e21e
LW		 1232 }
1233 RETURN;
1234}
1235
745d3a65
HM		 1236static I32
1237sortcv(SV *a, SV *b)
a0d0e21e 1238{
11343788 1239 dTHR;
748a9306 1240 I32 oldsaveix = savestack_ix;
a0d0e21e
LW		 1241 I32 oldscopeix = scopestack_ix;
1242 I32 result;
745d3a65
HM		 1243 GvSV(firstgv) = a;
1244 GvSV(secondgv) = b;
a0d0e21e
LW		 1245 stack_sp = stack_base;
1246 op = sortcop;
a6c477ed 1247 runops();
a0d0e21e
LW		 1248 if (stack_sp != stack_base + 1)
1249 croak("Sort subroutine didn't return single value");
748a9306 1250 if (!SvNIOKp(*stack_sp))
a0d0e21e
LW		 1251 croak("Sort subroutine didn't return a numeric value");
1252 result = SvIV(*stack_sp);
1253 while (scopestack_ix > oldscopeix) {
1254 LEAVE;
1255 }
748a9306 1256 leave_scope(oldsaveix);
a0d0e21e
LW		 1257 return result;
1258}
1259
a0d0e21e
LW		 1260PP(pp_reset)
1261{
4e35701f 1262 djSP;
a0d0e21e
LW		 1263 char *tmps;
1264
1265 if (MAXARG < 1)
1266 tmps = "";
1267 else
1268 tmps = POPp;
1269 sv_reset(tmps, curcop->cop_stash);
1270 PUSHs(&sv_yes);
1271 RETURN;
1272}
1273
1274PP(pp_lineseq)
1275{
1276 return NORMAL;
1277}
1278
1279PP(pp_dbstate)
1280{
1281 curcop = (COP*)op;
1282 TAINT_NOT; /* Each statement is presumed innocent */
1283 stack_sp = stack_base + cxstack[cxstack_ix].blk_oldsp;
1284 FREETMPS;
1285
1286 if (op->op_private || SvIV(DBsingle) || SvIV(DBsignal) || SvIV(DBtrace))
1287 {
1288 SV **sp;
1289 register CV *cv;
c09156bb 1290 register PERL_CONTEXT *cx;
748a9306 1291 I32 gimme = G_ARRAY;
a0d0e21e
LW		 1292 I32 hasargs;
1293 GV *gv;
1294
a0d0e21e
LW		 1295 gv = DBgv;
1296 cv = GvCV(gv);
a0d0e21e
LW		 1297 if (!cv)
1298 DIE("No DB::DB routine defined");
1299
06a5b730 1300 if (CvDEPTH(cv) >= 1 && !(debug & (1<<30))) /* don't do recursive DB::DB call */
a0d0e21e 1301 return NORMAL;
748a9306 1302
4633a7c4
LW		 1303 ENTER;
1304 SAVETMPS;
1305
748a9306 1306 SAVEI32(debug);
55497cff 1307 SAVESTACK_POS();
748a9306
LW		 1308 debug = 0;
1309 hasargs = 0;
1310 sp = stack_sp;
1311
a0d0e21e 1312 push_return(op->op_next);
748a9306 1313 PUSHBLOCK(cx, CXt_SUB, sp);
a0d0e21e
LW		 1314 PUSHSUB(cx);
1315 CvDEPTH(cv)++;
1316 (void)SvREFCNT_inc(cv);
1317 SAVESPTR(curpad);
1318 curpad = AvARRAY((AV*)*av_fetch(CvPADLIST(cv),1,FALSE));
1319 RETURNOP(CvSTART(cv));
1320 }
1321 else
1322 return NORMAL;
1323}
1324
1325PP(pp_scope)
1326{
1327 return NORMAL;
1328}
1329
1330PP(pp_enteriter)
1331{
4e35701f 1332 djSP; dMARK;
c09156bb 1333 register PERL_CONTEXT *cx;
54310121 1334 I32 gimme = GIMME_V;
a0d0e21e
LW		 1335 SV **svp;
1336
4633a7c4
LW		 1337 ENTER;
1338 SAVETMPS;
1339
54b9620d
MB		 1340#ifdef USE_THREADS
1341 if (op->op_flags & OPf_SPECIAL)
1342 svp = save_threadsv(op->op_targ); /* per-thread variable */
a0d0e21e 1343 else
54b9620d
MB		 1344#endif /* USE_THREADS */
1345 if (op->op_targ) {
1346 svp = &curpad[op->op_targ]; /* "my" variable */
1347 SAVESPTR(*svp);
1348 }
1349 else {
301d9039
GS		 1350 GV *gv = (GV*)POPs;
1351 (void)save_scalar(gv);
1352 svp = &GvSV(gv); /* symbol table variable */
54b9620d 1353 }
4633a7c4 1354
a0d0e21e
LW		 1355 ENTER;
1356
1357 PUSHBLOCK(cx, CXt_LOOP, SP);
1358 PUSHLOOP(cx, svp, MARK);
44a8e56a 1359 if (op->op_flags & OPf_STACKED)
1360 cx->blk_loop.iterary = (AV*)SvREFCNT_inc(POPs);
4633a7c4 1361 else {
1ce6579f 1362 cx->blk_loop.iterary = curstack;
93965878 1363 AvFILLp(curstack) = sp - stack_base;
4633a7c4
LW		 1364 cx->blk_loop.iterix = MARK - stack_base;
1365 }
a0d0e21e
LW		 1366
1367 RETURN;
1368}
1369
1370PP(pp_enterloop)
1371{
4e35701f 1372 djSP;
c09156bb 1373 register PERL_CONTEXT *cx;
54310121 1374 I32 gimme = GIMME_V;
a0d0e21e
LW		 1375
1376 ENTER;
1377 SAVETMPS;
1378 ENTER;
1379
1380 PUSHBLOCK(cx, CXt_LOOP, SP);
1381 PUSHLOOP(cx, 0, SP);
1382
1383 RETURN;
1384}
1385
1386PP(pp_leaveloop)
1387{
4e35701f 1388 djSP;
c09156bb 1389 register PERL_CONTEXT *cx;
f86702cc 1390 struct block_loop cxloop;
a0d0e21e
LW		 1391 I32 gimme;
1392 SV **newsp;
1393 PMOP *newpm;
1394 SV **mark;
1395
1396 POPBLOCK(cx,newpm);
4fdae800 1397 mark = newsp;
f86702cc 1398 POPLOOP1(cx); /* Delay POPLOOP2 until stack values are safe */
1399
a1f49e72 1400 TAINT_NOT;
54310121 1401 if (gimme == G_VOID)
1402 ; /* do nothing */
1403 else if (gimme == G_SCALAR) {
1404 if (mark < SP)
1405 *++newsp = sv_mortalcopy(*SP);
1406 else
1407 *++newsp = &sv_undef;
a0d0e21e
LW		 1408 }
1409 else {
a1f49e72 1410 while (mark < SP) {
a0d0e21e 1411 *++newsp = sv_mortalcopy(*++mark);
a1f49e72
CS		 1412 TAINT_NOT; /* Each item is independent */
1413 }
a0d0e21e 1414 }
f86702cc 1415 SP = newsp;
1416 PUTBACK;
1417
1418 POPLOOP2(); /* Stack values are safe: release loop vars ... */
1419 curpm = newpm; /* ... and pop $1 et al */
1420
a0d0e21e
LW		 1421 LEAVE;
1422 LEAVE;
1423
f86702cc 1424 return NORMAL;
a0d0e21e
LW		 1425}
1426
1427PP(pp_return)
1428{
4e35701f 1429 djSP; dMARK;
a0d0e21e 1430 I32 cxix;
c09156bb 1431 register PERL_CONTEXT *cx;
f86702cc 1432 struct block_sub cxsub;
1433 bool popsub2 = FALSE;
a0d0e21e
LW		 1434 I32 gimme;
1435 SV **newsp;
1436 PMOP *newpm;
1437 I32 optype = 0;
1438
1ce6579f 1439 if (curstack == sortstack) {
b3933176 1440 if (cxstack_ix == sortcxix || dopoptosub(cxstack_ix) <= sortcxix) {
16d20bd9
AD		 1441 if (cxstack_ix > sortcxix)
1442 dounwind(sortcxix);
1ce6579f 1443 AvARRAY(curstack)[1] = *SP;
a0d0e21e
LW		 1444 stack_sp = stack_base + 1;
1445 return 0;
1446 }
1447 }
1448
1449 cxix = dopoptosub(cxstack_ix);
1450 if (cxix < 0)
1451 DIE("Can't return outside a subroutine");
1452 if (cxix < cxstack_ix)
1453 dounwind(cxix);
1454
1455 POPBLOCK(cx,newpm);
1456 switch (cx->cx_type) {
1457 case CXt_SUB:
f86702cc 1458 POPSUB1(cx); /* Delay POPSUB2 until stack values are safe */
1459 popsub2 = TRUE;
a0d0e21e
LW		 1460 break;
1461 case CXt_EVAL:
1462 POPEVAL(cx);
748a9306
LW		 1463 if (optype == OP_REQUIRE &&
1464 (MARK == SP || (gimme == G_SCALAR && !SvTRUE(*SP))) )
1465 {
54310121 1466 /* Unassume the success we assumed earlier. */
748a9306
LW		 1467 char *name = cx->blk_eval.old_name;
1468 (void)hv_delete(GvHVn(incgv), name, strlen(name), G_DISCARD);
1469 DIE("%s did not return a true value", name);
1470 }
a0d0e21e
LW		 1471 break;
1472 default:
1473 DIE("panic: return");
a0d0e21e
LW		 1474 }
1475
a1f49e72 1476 TAINT_NOT;
a0d0e21e
LW		 1477 if (gimme == G_SCALAR) {
1478 if (MARK < SP)
f86702cc 1479 *++newsp = (popsub2 && SvTEMP(*SP))
1480 ? *SP : sv_mortalcopy(*SP);
a0d0e21e
LW		 1481 else
1482 *++newsp = &sv_undef;
a0d0e21e 1483 }
54310121 1484 else if (gimme == G_ARRAY) {
a1f49e72 1485 while (++MARK <= SP) {
f86702cc 1486 *++newsp = (popsub2 && SvTEMP(*MARK))
1487 ? *MARK : sv_mortalcopy(*MARK);
a1f49e72
CS		 1488 TAINT_NOT; /* Each item is independent */
1489 }
a0d0e21e 1490 }
a0d0e21e
LW		 1491 stack_sp = newsp;
1492
f86702cc 1493 /* Stack values are safe: */
1494 if (popsub2) {
1495 POPSUB2(); /* release CV and @_ ... */
1496 }
1497 curpm = newpm; /* ... and pop $1 et al */
1498
a0d0e21e
LW		 1499 LEAVE;
1500 return pop_return();
1501}
1502
1503PP(pp_last)
1504{
4e35701f 1505 djSP;
a0d0e21e 1506 I32 cxix;
c09156bb 1507 register PERL_CONTEXT *cx;
f86702cc 1508 struct block_loop cxloop;
1509 struct block_sub cxsub;
1510 I32 pop2 = 0;
a0d0e21e
LW		 1511 I32 gimme;
1512 I32 optype;
1513 OP *nextop;
1514 SV **newsp;
1515 PMOP *newpm;
1516 SV **mark = stack_base + cxstack[cxstack_ix].blk_oldsp;
a0d0e21e
LW		 1517
1518 if (op->op_flags & OPf_SPECIAL) {
1519 cxix = dopoptoloop(cxstack_ix);
1520 if (cxix < 0)
1521 DIE("Can't \"last\" outside a block");
1522 }
1523 else {
1524 cxix = dopoptolabel(cPVOP->op_pv);
1525 if (cxix < 0)
1526 DIE("Label not found for \"last %s\"", cPVOP->op_pv);
1527 }
1528 if (cxix < cxstack_ix)
1529 dounwind(cxix);
1530
1531 POPBLOCK(cx,newpm);
1532 switch (cx->cx_type) {
1533 case CXt_LOOP:
f86702cc 1534 POPLOOP1(cx); /* Delay POPLOOP2 until stack values are safe */
1535 pop2 = CXt_LOOP;
4fdae800 1536 nextop = cxloop.last_op->op_next;
a0d0e21e 1537 break;
f86702cc 1538 case CXt_SUB:
1539 POPSUB1(cx); /* Delay POPSUB2 until stack values are safe */
1540 pop2 = CXt_SUB;
a0d0e21e
LW		 1541 nextop = pop_return();
1542 break;
f86702cc 1543 case CXt_EVAL:
1544 POPEVAL(cx);
a0d0e21e
LW		 1545 nextop = pop_return();
1546 break;
1547 default:
1548 DIE("panic: last");
a0d0e21e
LW		 1549 }
1550
a1f49e72 1551 TAINT_NOT;
a0d0e21e 1552 if (gimme == G_SCALAR) {
f86702cc 1553 if (MARK < SP)
1554 *++newsp = ((pop2 == CXt_SUB) && SvTEMP(*SP))
1555 ? *SP : sv_mortalcopy(*SP);
a0d0e21e
LW		 1556 else
1557 *++newsp = &sv_undef;
1558 }
54310121 1559 else if (gimme == G_ARRAY) {
a1f49e72 1560 while (++MARK <= SP) {
f86702cc 1561 *++newsp = ((pop2 == CXt_SUB) && SvTEMP(*MARK))
1562 ? *MARK : sv_mortalcopy(*MARK);
a1f49e72
CS		 1563 TAINT_NOT; /* Each item is independent */
1564 }
f86702cc 1565 }
1566 SP = newsp;
1567 PUTBACK;
1568
1569 /* Stack values are safe: */
1570 switch (pop2) {
1571 case CXt_LOOP:
1572 POPLOOP2(); /* release loop vars ... */
4fdae800 1573 LEAVE;
f86702cc 1574 break;
1575 case CXt_SUB:
1576 POPSUB2(); /* release CV and @_ ... */
1577 break;
a0d0e21e 1578 }
f86702cc 1579 curpm = newpm; /* ... and pop $1 et al */
a0d0e21e
LW		 1580
1581 LEAVE;
f86702cc 1582 return nextop;
a0d0e21e
LW		 1583}
1584
1585PP(pp_next)
1586{
1587 I32 cxix;
c09156bb 1588 register PERL_CONTEXT *cx;
a0d0e21e
LW		 1589 I32 oldsave;
1590
1591 if (op->op_flags & OPf_SPECIAL) {
1592 cxix = dopoptoloop(cxstack_ix);
1593 if (cxix < 0)
1594 DIE("Can't \"next\" outside a block");
1595 }
1596 else {
1597 cxix = dopoptolabel(cPVOP->op_pv);
1598 if (cxix < 0)
1599 DIE("Label not found for \"next %s\"", cPVOP->op_pv);
1600 }
1601 if (cxix < cxstack_ix)
1602 dounwind(cxix);
1603
1604 TOPBLOCK(cx);
1605 oldsave = scopestack[scopestack_ix - 1];
1606 LEAVE_SCOPE(oldsave);
1607 return cx->blk_loop.next_op;
1608}
1609
1610PP(pp_redo)
1611{
1612 I32 cxix;
c09156bb 1613 register PERL_CONTEXT *cx;
a0d0e21e
LW		 1614 I32 oldsave;
1615
1616 if (op->op_flags & OPf_SPECIAL) {
1617 cxix = dopoptoloop(cxstack_ix);
1618 if (cxix < 0)
1619 DIE("Can't \"redo\" outside a block");
1620 }
1621 else {
1622 cxix = dopoptolabel(cPVOP->op_pv);
1623 if (cxix < 0)
1624 DIE("Label not found for \"redo %s\"", cPVOP->op_pv);
1625 }
1626 if (cxix < cxstack_ix)
1627 dounwind(cxix);
1628
1629 TOPBLOCK(cx);
1630 oldsave = scopestack[scopestack_ix - 1];
1631 LEAVE_SCOPE(oldsave);
1632 return cx->blk_loop.redo_op;
1633}
1634
1635static OP* lastgotoprobe;
1636
1637static OP *
8ac85365 1638dofindlabel(OP *o, char *label, OP **opstack, OP **oplimit)
a0d0e21e
LW		 1639{
1640 OP *kid;
1641 OP **ops = opstack;
fc36a67e 1642 static char too_deep[] = "Target of goto is too deeply nested";
a0d0e21e 1643
fc36a67e 1644 if (ops >= oplimit)
1645 croak(too_deep);
11343788
MB		 1646 if (o->op_type == OP_LEAVE ||
1647 o->op_type == OP_SCOPE ||
1648 o->op_type == OP_LEAVELOOP ||
1649 o->op_type == OP_LEAVETRY)
fc36a67e 1650 {
5dc0d613 1651 *ops++ = cUNOPo->op_first;
fc36a67e 1652 if (ops >= oplimit)
1653 croak(too_deep);
1654 }
a0d0e21e 1655 *ops = 0;
11343788 1656 if (o->op_flags & OPf_KIDS) {
a0d0e21e 1657 /* First try all the kids at this level, since that's likeliest. */
11343788 1658 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
a0d0e21e
LW		 1659 if ((kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) &&
1660 kCOP->cop_label && strEQ(kCOP->cop_label, label))
1661 return kid;
1662 }
11343788 1663 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
a0d0e21e
LW		 1664 if (kid == lastgotoprobe)
1665 continue;
fc36a67e 1666 if ((kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) &&
1667 (ops == opstack ||
1668 (ops[-1]->op_type != OP_NEXTSTATE &&
1669 ops[-1]->op_type != OP_DBSTATE)))
1670 *ops++ = kid;
5dc0d613 1671 if (o = dofindlabel(kid, label, ops, oplimit))
11343788 1672 return o;
a0d0e21e
LW		 1673 }
1674 }
1675 *ops = 0;
1676 return 0;
1677}
1678
1679PP(pp_dump)
1680{
1681 return pp_goto(ARGS);
1682 /*NOTREACHED*/
1683}
1684
1685PP(pp_goto)
1686{
4e35701f 1687 djSP;
a0d0e21e
LW		 1688 OP *retop = 0;
1689 I32 ix;
c09156bb 1690 register PERL_CONTEXT *cx;
fc36a67e 1691#define GOTO_DEPTH 64
1692 OP *enterops[GOTO_DEPTH];
a0d0e21e
LW		 1693 char *label;
1694 int do_dump = (op->op_type == OP_DUMP);
1695
1696 label = 0;
1697 if (op->op_flags & OPf_STACKED) {
1698 SV *sv = POPs;
1699
1700 /* This egregious kludge implements goto &subroutine */
1701 if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVCV) {
1702 I32 cxix;
c09156bb 1703 register PERL_CONTEXT *cx;
a0d0e21e
LW		 1704 CV* cv = (CV*)SvRV(sv);
1705 SV** mark;
1706 I32 items = 0;
1707 I32 oldsave;
1708
4aa0a1f7
AD		 1709 if (!CvROOT(cv) && !CvXSUB(cv)) {
1710 if (CvGV(cv)) {
1711 SV *tmpstr = sv_newmortal();
e5cf08de 1712 gv_efullname3(tmpstr, CvGV(cv), Nullch);
4aa0a1f7
AD		 1713 DIE("Goto undefined subroutine &%s",SvPVX(tmpstr));
1714 }
1715 DIE("Goto undefined subroutine");
1716 }
1717
a0d0e21e
LW		 1718 /* First do some returnish stuff. */
1719 cxix = dopoptosub(cxstack_ix);
1720 if (cxix < 0)
1721 DIE("Can't goto subroutine outside a subroutine");
1722 if (cxix < cxstack_ix)
1723 dounwind(cxix);
1724 TOPBLOCK(cx);
1725 mark = stack_sp;
1726 if (cx->blk_sub.hasargs) { /* put @_ back onto stack */
1727 AV* av = cx->blk_sub.argarray;
1728
93965878 1729 items = AvFILLp(av) + 1;
1ce6579f 1730 stack_sp++;
1731 EXTEND(stack_sp, items); /* @_ could have been extended. */
1732 Copy(AvARRAY(av), stack_sp, items, SV*);
a0d0e21e 1733 stack_sp += items;
6d4ff0d2 1734#ifndef USE_THREADS
2c05e328 1735 SvREFCNT_dec(GvAV(defgv));
a0d0e21e 1736 GvAV(defgv) = cx->blk_sub.savearray;
6d4ff0d2 1737#endif /* USE_THREADS */
a0d0e21e 1738 AvREAL_off(av);
4633a7c4 1739 av_clear(av);
a0d0e21e
LW		 1740 }
1741 if (!(CvDEPTH(cx->blk_sub.cv) = cx->blk_sub.olddepth))
1742 SvREFCNT_dec(cx->blk_sub.cv);
1743 oldsave = scopestack[scopestack_ix - 1];
1744 LEAVE_SCOPE(oldsave);
1745
1746 /* Now do some callish stuff. */
1747 SAVETMPS;
1748 if (CvXSUB(cv)) {
1749 if (CvOLDSTYLE(cv)) {
ecfc5424 1750 I32 (*fp3)_((int,int,int));
a0d0e21e
LW		 1751 while (sp > mark) {
1752 sp[1] = sp[0];
1753 sp--;
1754 }
ecfc5424
AD		 1755 fp3 = (I32(*)_((int,int,int)))CvXSUB(cv);
1756 items = (*fp3)(CvXSUBANY(cv).any_i32,
1757 mark - stack_base + 1,
1758 items);
a0d0e21e
LW		 1759 sp = stack_base + items;
1760 }
1761 else {
1ce6579f 1762 stack_sp--; /* There is no cv arg. */
a0d0e21e
LW		 1763 (void)(*CvXSUB(cv))(cv);
1764 }
1765 LEAVE;
1766 return pop_return();
1767 }
1768 else {
1769 AV* padlist = CvPADLIST(cv);
1770 SV** svp = AvARRAY(padlist);
1771 cx->blk_sub.cv = cv;
1772 cx->blk_sub.olddepth = CvDEPTH(cv);
1773 CvDEPTH(cv)++;
1774 if (CvDEPTH(cv) < 2)
1775 (void)SvREFCNT_inc(cv);
1776 else { /* save temporaries on recursion? */
1777 if (CvDEPTH(cv) == 100 && dowarn)
44a8e56a 1778 sub_crush_depth(cv);
93965878 1779 if (CvDEPTH(cv) > AvFILLp(padlist)) {
a0d0e21e 1780 AV *newpad = newAV();
4aa0a1f7 1781 SV **oldpad = AvARRAY(svp[CvDEPTH(cv)-1]);
93965878 1782 I32 ix = AvFILLp((AV*)svp[1]);
a0d0e21e 1783 svp = AvARRAY(svp[0]);
748a9306 1784 for ( ;ix > 0; ix--) {
a0d0e21e 1785 if (svp[ix] != &sv_undef) {
748a9306 1786 char *name = SvPVX(svp[ix]);
5f05dabc 1787 if ((SvFLAGS(svp[ix]) & SVf_FAKE)
1788 || *name == '&')
1789 {
1790 /* outer lexical or anon code */
748a9306 1791 av_store(newpad, ix,
4aa0a1f7 1792 SvREFCNT_inc(oldpad[ix]) );
748a9306
LW		 1793 }
1794 else { /* our own lexical */
1795 if (*name == '@')
1796 av_store(newpad, ix, sv = (SV*)newAV());
1797 else if (*name == '%')
1798 av_store(newpad, ix, sv = (SV*)newHV());
1799 else
1800 av_store(newpad, ix, sv = NEWSV(0,0));
1801 SvPADMY_on(sv);
1802 }
a0d0e21e
LW		 1803 }
1804 else {
748a9306 1805 av_store(newpad, ix, sv = NEWSV(0,0));
a0d0e21e
LW		 1806 SvPADTMP_on(sv);
1807 }
1808 }
1809 if (cx->blk_sub.hasargs) {
1810 AV* av = newAV();
1811 av_extend(av, 0);
1812 av_store(newpad, 0, (SV*)av);
1813 AvFLAGS(av) = AVf_REIFY;
1814 }
1815 av_store(padlist, CvDEPTH(cv), (SV*)newpad);
93965878 1816 AvFILLp(padlist) = CvDEPTH(cv);
a0d0e21e
LW		 1817 svp = AvARRAY(padlist);
1818 }
1819 }
6d4ff0d2
MB		 1820#ifdef USE_THREADS
1821 if (!cx->blk_sub.hasargs) {
1822 AV* av = (AV*)curpad[0];
1823
93965878 1824 items = AvFILLp(av) + 1;
6d4ff0d2
MB		 1825 if (items) {
1826 /* Mark is at the end of the stack. */
1827 EXTEND(sp, items);
1828 Copy(AvARRAY(av), sp + 1, items, SV*);
1829 sp += items;
1830 PUTBACK ;
1831 }
1832 }
1833#endif /* USE_THREADS */
a0d0e21e
LW		 1834 SAVESPTR(curpad);
1835 curpad = AvARRAY((AV*)svp[CvDEPTH(cv)]);
6d4ff0d2
MB		 1836#ifndef USE_THREADS
1837 if (cx->blk_sub.hasargs)
1838#endif /* USE_THREADS */
1839 {
a0d0e21e
LW		 1840 AV* av = (AV*)curpad[0];
1841 SV** ary;
1842
6d4ff0d2 1843#ifndef USE_THREADS
a0d0e21e 1844 cx->blk_sub.savearray = GvAV(defgv);
2c05e328 1845 GvAV(defgv) = (AV*)SvREFCNT_inc(av);
6d4ff0d2
MB		 1846#endif /* USE_THREADS */
1847 cx->blk_sub.argarray = av;
a0d0e21e
LW		 1848 ++mark;
1849
1850 if (items >= AvMAX(av) + 1) {
1851 ary = AvALLOC(av);
1852 if (AvARRAY(av) != ary) {
1853 AvMAX(av) += AvARRAY(av) - AvALLOC(av);
1854 SvPVX(av) = (char*)ary;
1855 }
1856 if (items >= AvMAX(av) + 1) {
1857 AvMAX(av) = items - 1;
1858 Renew(ary,items+1,SV*);
1859 AvALLOC(av) = ary;
1860 SvPVX(av) = (char*)ary;
1861 }
1862 }
1863 Copy(mark,AvARRAY(av),items,SV*);
93965878 1864 AvFILLp(av) = items - 1;
a0d0e21e
LW		 1865
1866 while (items--) {
1867 if (*mark)
1868 SvTEMP_off(*mark);
1869 mark++;
1870 }
1871 }
84902520 1872 if (PERLDB_SUB && curstash != debstash) {
44a8e56a 1873 /*
1874 * We do not care about using sv to call CV;
1875 * it's for informational purposes only.
1876 */
1ce6579f 1877 SV *sv = GvSV(DBsub);
1878 save_item(sv);
e5cf08de 1879 gv_efullname3(sv, CvGV(cv), Nullch);
1ce6579f 1880 }
a0d0e21e
LW		 1881 RETURNOP(CvSTART(cv));
1882 }
1883 }
1884 else
1885 label = SvPV(sv,na);
1886 }
1887 else if (op->op_flags & OPf_SPECIAL) {
1888 if (! do_dump)
1889 DIE("goto must have label");
1890 }
1891 else
1892 label = cPVOP->op_pv;
1893
1894 if (label && *label) {
1895 OP *gotoprobe = 0;
1896
1897 /* find label */
1898
1899 lastgotoprobe = 0;
1900 *enterops = 0;
1901 for (ix = cxstack_ix; ix >= 0; ix--) {
1902 cx = &cxstack[ix];
1903 switch (cx->cx_type) {
a0d0e21e
LW		 1904 case CXt_EVAL:
1905 gotoprobe = eval_root; /* XXX not good for nested eval */
1906 break;
1907 case CXt_LOOP:
1908 gotoprobe = cx->blk_oldcop->op_sibling;
1909 break;
1910 case CXt_SUBST:
1911 continue;
1912 case CXt_BLOCK:
1913 if (ix)
1914 gotoprobe = cx->blk_oldcop->op_sibling;
1915 else
1916 gotoprobe = main_root;
1917 break;
b3933176
CS		 1918 case CXt_SUB:
1919 if (CvDEPTH(cx->blk_sub.cv)) {
1920 gotoprobe = CvROOT(cx->blk_sub.cv);
1921 break;
1922 }
1923 /* FALL THROUGH */
0a753a76 1924 case CXt_NULL:
1925 DIE("Can't \"goto\" outside a block");
a0d0e21e
LW		 1926 default:
1927 if (ix)
1928 DIE("panic: goto");
68dc0745 1929 gotoprobe = main_root;
a0d0e21e
LW		 1930 break;
1931 }
fc36a67e 1932 retop = dofindlabel(gotoprobe, label,
1933 enterops, enterops + GOTO_DEPTH);
a0d0e21e
LW		 1934 if (retop)
1935 break;
1936 lastgotoprobe = gotoprobe;
1937 }
1938 if (!retop)
1939 DIE("Can't find label %s", label);
1940
1941 /* pop unwanted frames */
1942
1943 if (ix < cxstack_ix) {
1944 I32 oldsave;
1945
1946 if (ix < 0)
1947 ix = 0;
1948 dounwind(ix);
1949 TOPBLOCK(cx);
1950 oldsave = scopestack[scopestack_ix];
1951 LEAVE_SCOPE(oldsave);
1952 }
1953
1954 /* push wanted frames */
1955
748a9306 1956 if (*enterops && enterops[1]) {
a0d0e21e 1957 OP *oldop = op;
748a9306 1958 for (ix = 1; enterops[ix]; ix++) {
a0d0e21e 1959 op = enterops[ix];
84902520
TB		 1960 /* Eventually we may want to stack the needed arguments
1961 * for each op. For now, we punt on the hard ones. */
1962 if (op->op_type == OP_ENTERITER)
1963 DIE("Can't \"goto\" into the middle of a foreach loop",
1964 label);
11343788 1965 (*op->op_ppaddr)(ARGS);
a0d0e21e
LW		 1966 }
1967 op = oldop;
1968 }
1969 }
1970
1971 if (do_dump) {
a5f75d66
AD		 1972#ifdef VMS
1973 if (!retop) retop = main_start;
1974#endif
a0d0e21e
LW		 1975 restartop = retop;
1976 do_undump = TRUE;
1977
1978 my_unexec();
1979
1980 restartop = 0; /* hmm, must be GNU unexec().. */
1981 do_undump = FALSE;
1982 }
1983
1ce6579f 1984 if (curstack == signalstack) {
748a9306 1985 restartop = retop;
54310121 1986 JMPENV_JUMP(3);
748a9306
LW		 1987 }
1988
a0d0e21e
LW		 1989 RETURNOP(retop);
1990}
1991
1992PP(pp_exit)
1993{
4e35701f 1994 djSP;
a0d0e21e
LW		 1995 I32 anum;
1996
1997 if (MAXARG < 1)
1998 anum = 0;
ff0cee69 1999 else {
a0d0e21e 2000 anum = SvIVx(POPs);
ff0cee69 2001#ifdef VMSISH_EXIT
2002 if (anum == 1 && VMSISH_EXIT)
2003 anum = 0;
2004#endif
2005 }
a0d0e21e
LW		 2006 my_exit(anum);
2007 PUSHs(&sv_undef);
2008 RETURN;
2009}
2010
2011#ifdef NOTYET
2012PP(pp_nswitch)
2013{
4e35701f 2014 djSP;
a0d0e21e
LW		 2015 double value = SvNVx(GvSV(cCOP->cop_gv));
2016 register I32 match = I_32(value);
2017
2018 if (value < 0.0) {
2019 if (((double)match) > value)
2020 --match; /* was fractional--truncate other way */
2021 }
2022 match -= cCOP->uop.scop.scop_offset;
2023 if (match < 0)
2024 match = 0;
2025 else if (match > cCOP->uop.scop.scop_max)
2026 match = cCOP->uop.scop.scop_max;
2027 op = cCOP->uop.scop.scop_next[match];
2028 RETURNOP(op);
2029}
2030
2031PP(pp_cswitch)
2032{
4e35701f 2033 djSP;
a0d0e21e
LW		 2034 register I32 match;
2035
2036 if (multiline)
2037 op = op->op_next; /* can't assume anything */
2038 else {
2039 match = *(SvPVx(GvSV(cCOP->cop_gv), na)) & 255;
2040 match -= cCOP->uop.scop.scop_offset;
2041 if (match < 0)
2042 match = 0;
2043 else if (match > cCOP->uop.scop.scop_max)
2044 match = cCOP->uop.scop.scop_max;
2045 op = cCOP->uop.scop.scop_next[match];
2046 }
2047 RETURNOP(op);
2048}
2049#endif
2050
2051/* Eval. */
2052
2053static void
8ac85365 2054save_lines(AV *array, SV *sv)
a0d0e21e
LW		 2055{
2056 register char *s = SvPVX(sv);
2057 register char *send = SvPVX(sv) + SvCUR(sv);
2058 register char *t;
2059 register I32 line = 1;
2060
2061 while (s && s < send) {
2062 SV *tmpstr = NEWSV(85,0);
2063
2064 sv_upgrade(tmpstr, SVt_PVMG);
2065 t = strchr(s, '\n');
2066 if (t)
2067 t++;
2068 else
2069 t = send;
2070
2071 sv_setpvn(tmpstr, s, t - s);
2072 av_store(array, line++, tmpstr);
2073 s = t;
2074 }
2075}
2076
2077static OP *
8ac85365 2078docatch(OP *o)
1e422769 2079{
e858de61 2080 dTHR;
1e422769 2081 int ret;
1e422769 2082 OP *oldop = op;
54310121 2083 dJMPENV;
1e422769 2084
2085 op = o;
1e422769 2086#ifdef DEBUGGING
54310121 2087 assert(CATCH_GET == TRUE);
7c06b590 2088 DEBUG_l(deb("Setting up local jumplevel %p, was %p\n", &cur_env, top_env));
1e422769 2089#endif
22921e25
CS		 2090 JMPENV_PUSH(ret);
2091 switch (ret) {
1e422769 2092 default: /* topmost level handles it */
54310121 2093 JMPENV_POP;
1e422769 2094 op = oldop;
54310121 2095 JMPENV_JUMP(ret);
1e422769 2096 /* NOTREACHED */
2097 case 3:
2098 if (!restartop) {
2099 PerlIO_printf(PerlIO_stderr(), "panic: restartop\n");
2100 break;
2101 }
1e422769 2102 op = restartop;
2103 restartop = 0;
2104 /* FALL THROUGH */
2105 case 0:
2106 runops();
2107 break;
2108 }
54310121 2109 JMPENV_POP;
1e422769 2110 op = oldop;
2111 return Nullop;
2112}
2113
c277df42
IZ		 2114OP *
2115sv_compile_2op(SV *sv, OP** startop, char *code, AV** avp)
2116/* sv Text to convert to OP tree. */
2117/* startop op_free() this to undo. */
2118/* code Short string id of the caller. */
2119{
2120 dSP; /* Make POPBLOCK work. */
2121 PERL_CONTEXT *cx;
2122 SV **newsp;
f987c7de 2123 I32 gimme = 0; /* SUSPECT - INITIALZE TO WHAT? NI-S */
c277df42
IZ		 2124 I32 optype;
2125 OP dummy;
2126 OP *oop = op, *rop;
2127 char tmpbuf[TYPE_DIGITS(long) + 12 + 10];
2128 char *safestr;
2129
2130 ENTER;
2131 lex_start(sv);
2132 SAVETMPS;
2133 /* switch to eval mode */
2134
2135 SAVESPTR(compiling.cop_filegv);
2136 SAVEI16(compiling.cop_line);
2137 sprintf(tmpbuf, "_<(%.10s_eval %lu)", code, (unsigned long)++evalseq);
2138 compiling.cop_filegv = gv_fetchfile(tmpbuf+2);
2139 compiling.cop_line = 1;
2140 /* XXX For C<eval "...">s within BEGIN {} blocks, this ends up
2141 deleting the eval's FILEGV from the stash before gv_check() runs
2142 (i.e. before run-time proper). To work around the coredump that
2143 ensues, we always turn GvMULTI_on for any globals that were
2144 introduced within evals. See force_ident(). GSAR 96-10-12 */
2145 safestr = savepv(tmpbuf);
2146 SAVEDELETE(defstash, safestr, strlen(safestr));
2147 SAVEI32(hints);
2148 SAVEPPTR(op);
2149 hints = 0;
2150
2151 op = &dummy;
2152 op->op_type = 0; /* Avoid uninit warning. */
2153 op->op_flags = 0; /* Avoid uninit warning. */
2154 PUSHBLOCK(cx, CXt_EVAL, SP);
2155 PUSHEVAL(cx, 0, compiling.cop_filegv);
2156 rop = doeval(G_SCALAR, startop);
2157 POPBLOCK(cx,curpm);
2158 POPEVAL(cx);
2159
2160 (*startop)->op_type = OP_NULL;
2161 (*startop)->op_ppaddr = ppaddr[OP_NULL];
2162 lex_end();
2163 *avp = (AV*)SvREFCNT_inc(comppad);
2164 LEAVE;
2165 return rop;
2166}
2167
0f15f207 2168/* With USE_THREADS, eval_owner must be held on entry to doeval */
1e422769 2169static OP *
c277df42 2170doeval(int gimme, OP** startop)
a0d0e21e
LW		 2171{
2172 dSP;
2173 OP *saveop = op;
2174 HV *newstash;
ff3ff8d1 2175 CV *caller;
748a9306 2176 AV* comppadlist;
67a38de0 2177 I32 i;
a0d0e21e
LW		 2178
2179 in_eval = 1;
2180
1ce6579f 2181 PUSHMARK(SP);
2182
a0d0e21e
LW		 2183 /* set up a scratch pad */
2184
55497cff 2185 SAVEI32(padix);
a0d0e21e
LW		 2186 SAVESPTR(curpad);
2187 SAVESPTR(comppad);
2188 SAVESPTR(comppad_name);
55497cff 2189 SAVEI32(comppad_name_fill);
2190 SAVEI32(min_intro_pending);
2191 SAVEI32(max_intro_pending);
748a9306 2192
ff3ff8d1 2193 caller = compcv;
67a38de0
NIS		 2194 for (i = cxstack_ix - 1; i >= 0; i--) {
2195 PERL_CONTEXT *cx = &cxstack[i];
2196 if (cx->cx_type == CXt_EVAL)
2197 break;
2198 else if (cx->cx_type == CXt_SUB) {
2199 caller = cx->blk_sub.cv;
2200 break;
2201 }
2202 }
2203
748a9306
LW		 2204 SAVESPTR(compcv);
2205 compcv = (CV*)NEWSV(1104,0);
2206 sv_upgrade((SV *)compcv, SVt_PVCV);
07055b4c 2207 CvUNIQUE_on(compcv);
11343788
MB		 2208#ifdef USE_THREADS
2209 CvOWNER(compcv) = 0;
12ca11f6 2210 New(666, CvMUTEXP(compcv), 1, perl_mutex);
11343788 2211 MUTEX_INIT(CvMUTEXP(compcv));
11343788 2212#endif /* USE_THREADS */
748a9306 2213
a0d0e21e 2214 comppad = newAV();
6d4ff0d2
MB		 2215 av_push(comppad, Nullsv);
2216 curpad = AvARRAY(comppad);
a0d0e21e
LW		 2217 comppad_name = newAV();
2218 comppad_name_fill = 0;
6d4ff0d2
MB		 2219 min_intro_pending = 0;
2220 padix = 0;
11343788
MB		 2221#ifdef USE_THREADS
2222 av_store(comppad_name, 0, newSVpv("@_", 2));
6d4ff0d2
MB		 2223 curpad[0] = (SV*)newAV();
2224 SvPADMY_on(curpad[0]); /* XXX Needed? */
11343788 2225#endif /* USE_THREADS */
a0d0e21e 2226
748a9306
LW		 2227 comppadlist = newAV();
2228 AvREAL_off(comppadlist);
8e07c86e
AD		 2229 av_store(comppadlist, 0, (SV*)comppad_name);
2230 av_store(comppadlist, 1, (SV*)comppad);
748a9306 2231 CvPADLIST(compcv) = comppadlist;
2c05e328 2232
c277df42 2233 if (!saveop || saveop->op_type != OP_REQUIRE)
199100c8 2234 CvOUTSIDE(compcv) = (CV*)SvREFCNT_inc(caller);
07055b4c 2235
8e07c86e 2236 SAVEFREESV(compcv);
748a9306 2237
a0d0e21e
LW		 2238 /* make sure we compile in the right package */
2239
2240 newstash = curcop->cop_stash;
2241 if (curstash != newstash) {
2242 SAVESPTR(curstash);
2243 curstash = newstash;
2244 }
2245 SAVESPTR(beginav);
2246 beginav = newAV();
2247 SAVEFREESV(beginav);
2248
2249 /* try to compile it */
2250
2251 eval_root = Nullop;
2252 error_count = 0;
2253 curcop = &compiling;
2254 curcop->cop_arybase = 0;
c07a80fd 2255 SvREFCNT_dec(rs);
2256 rs = newSVpv("\n", 1);
c277df42 2257 if (saveop && saveop->op_flags & OPf_SPECIAL)
1ce6579f 2258 in_eval |= 4;
2259 else
38a03e6e 2260 sv_setpv(ERRSV,"");
a0d0e21e
LW		 2261 if (yyparse() || error_count || !eval_root) {
2262 SV **newsp;
2263 I32 gimme;
c09156bb 2264 PERL_CONTEXT *cx;
c277df42 2265 I32 optype = 0; /* Might be reset by POPEVAL. */
a0d0e21e
LW		 2266
2267 op = saveop;
2268 if (eval_root) {
2269 op_free(eval_root);
2270 eval_root = Nullop;
2271 }
1ce6579f 2272 SP = stack_base + POPMARK; /* pop original mark */
c277df42
IZ		 2273 if (!startop) {
2274 POPBLOCK(cx,curpm);
2275 POPEVAL(cx);
2276 pop_return();
2277 }
a0d0e21e
LW		 2278 lex_end();
2279 LEAVE;
7a2e2cd6 2280 if (optype == OP_REQUIRE) {
38a03e6e 2281 char* msg = SvPVx(ERRSV, na);
7a2e2cd6 2282 DIE("%s", *msg ? msg : "Compilation failed in require");
c277df42
IZ		 2283 } else if (startop) {
2284 char* msg = SvPVx(ERRSV, na);
2285
2286 POPBLOCK(cx,curpm);
2287 POPEVAL(cx);
2288 croak("%sCompilation failed in regexp", (*msg ? msg : "Unknown error\n"));
7a2e2cd6 2289 }
c07a80fd 2290 SvREFCNT_dec(rs);
2291 rs = SvREFCNT_inc(nrs);
f2134d95
MB		 2292#ifdef USE_THREADS
2293 MUTEX_LOCK(&eval_mutex);
2294 eval_owner = 0;
2295 COND_SIGNAL(&eval_cond);
2296 MUTEX_UNLOCK(&eval_mutex);
2297#endif /* USE_THREADS */
a0d0e21e
LW		 2298 RETPUSHUNDEF;
2299 }
c07a80fd 2300 SvREFCNT_dec(rs);
2301 rs = SvREFCNT_inc(nrs);
a0d0e21e 2302 compiling.cop_line = 0;
c277df42
IZ		 2303 if (startop) {
2304 *startop = eval_root;
2305 SvREFCNT_dec(CvOUTSIDE(compcv));
2306 CvOUTSIDE(compcv) = Nullcv;
2307 } else
2308 SAVEFREEOP(eval_root);
54310121 2309 if (gimme & G_VOID)
2310 scalarvoid(eval_root);
2311 else if (gimme & G_ARRAY)
a0d0e21e
LW		 2312 list(eval_root);
2313 else
2314 scalar(eval_root);
2315
2316 DEBUG_x(dump_eval());
2317
55497cff 2318 /* Register with debugger: */
84902520 2319 if (PERLDB_INTER && saveop->op_type == OP_REQUIRE) {
55497cff 2320 CV *cv = perl_get_cv("DB::postponed", FALSE);
55497cff 2321 if (cv) {
2322 dSP;
2323 PUSHMARK(sp);
2324 XPUSHs((SV*)compiling.cop_filegv);
2325 PUTBACK;
2326 perl_call_sv((SV*)cv, G_DISCARD);
2327 }
2328 }
2329
a0d0e21e
LW		 2330 /* compiled okay, so do it */
2331
4fdae800 2332 CvDEPTH(compcv) = 1;
1ce6579f 2333 SP = stack_base + POPMARK; /* pop original mark */
c277df42 2334 op = saveop; /* The caller may need it. */
b35b2403 2335#ifdef USE_THREADS
11343788
MB		 2336 MUTEX_LOCK(&eval_mutex);
2337 eval_owner = 0;
2338 COND_SIGNAL(&eval_cond);
2339 MUTEX_UNLOCK(&eval_mutex);
b35b2403 2340#endif /* USE_THREADS */
5dc0d613 2341
a0d0e21e
LW		 2342 RETURNOP(eval_start);
2343}
2344
2345PP(pp_require)
2346{
4e35701f 2347 djSP;
c09156bb 2348 register PERL_CONTEXT *cx;
a0d0e21e
LW		 2349 SV *sv;
2350 char *name;
6132ea6c 2351 STRLEN len;
46fc3d4c 2352 char *tryname;
2353 SV *namesv = Nullsv;
a0d0e21e
LW		 2354 SV** svp;
2355 I32 gimme = G_SCALAR;
760ac839 2356 PerlIO *tryrsfp = 0;
a0d0e21e
LW		 2357
2358 sv = POPs;
4633a7c4 2359 if (SvNIOKp(sv) && !SvPOKp(sv)) {
36477c24 2360 SET_NUMERIC_STANDARD();
a5f75d66
AD		 2361 if (atof(patchlevel) + 0.00000999 < SvNV(sv))
2362 DIE("Perl %s required--this is only version %s, stopped",
2363 SvPV(sv,na),patchlevel);
a0d0e21e
LW		 2364 RETPUSHYES;
2365 }
6132ea6c
GS		 2366 name = SvPV(sv, len);
2367 if (!(name && len > 0 && *name))
a0d0e21e 2368 DIE("Null filename used");
4633a7c4 2369 TAINT_PROPER("require");
a0d0e21e 2370 if (op->op_type == OP_REQUIRE &&
6132ea6c 2371 (svp = hv_fetch(GvHVn(incgv), name, len, 0)) &&
a0d0e21e
LW		 2372 *svp != &sv_undef)
2373 RETPUSHYES;
2374
2375 /* prepare to compile file */
2376
46fc3d4c 2377 if (*name == '/' ||
2378 (*name == '.' &&
2379 (name[1] == '/' ||
2380 (name[1] == '.' && name[2] == '/')))
4633a7c4 2381#ifdef DOSISH
46fc3d4c 2382 || (name[0] && name[1] == ':')
4633a7c4 2383#endif
ba42ef2f
WJ		 2384#ifdef WIN32
2385 || (name[0] == '\\' && name[1] == '\\') /* UNC path */
2386#endif
748a9306 2387#ifdef VMS
46fc3d4c 2388 || (strchr(name,':') || ((*name == '[' || *name == '<') &&
2389 (isALNUM(name[1]) || strchr("$-_]>",name[1]))))
748a9306
LW		 2390#endif
2391 )
a0d0e21e 2392 {
46fc3d4c 2393 tryname = name;
a868473f 2394 tryrsfp = PerlIO_open(name,PERL_SCRIPT_MODE);
a0d0e21e
LW		 2395 }
2396 else {
2397 AV *ar = GvAVn(incgv);
2398 I32 i;
748a9306 2399#ifdef VMS
46fc3d4c 2400 char *unixname;
2401 if ((unixname = tounixspec(name, Nullch)) != Nullch)
2402#endif
2403 {
2404 namesv = NEWSV(806, 0);
2405 for (i = 0; i <= AvFILL(ar); i++) {
2406 char *dir = SvPVx(*av_fetch(ar, i, TRUE), na);
2407#ifdef VMS
2408 char *unixdir;
2409 if ((unixdir = tounixpath(dir, Nullch)) == Nullch)
2410 continue;
2411 sv_setpv(namesv, unixdir);
2412 sv_catpv(namesv, unixname);
748a9306 2413#else
46fc3d4c 2414 sv_setpvf(namesv, "%s/%s", dir, name);
748a9306 2415#endif
46fc3d4c 2416 tryname = SvPVX(namesv);
a868473f 2417 tryrsfp = PerlIO_open(tryname, PERL_SCRIPT_MODE);
46fc3d4c 2418 if (tryrsfp) {
2419 if (tryname[0] == '.' && tryname[1] == '/')
2420 tryname += 2;
2421 break;
2422 }
a0d0e21e
LW		 2423 }
2424 }
2425 }
2426 SAVESPTR(compiling.cop_filegv);
46fc3d4c 2427 compiling.cop_filegv = gv_fetchfile(tryrsfp ? tryname : name);
2428 SvREFCNT_dec(namesv);
a0d0e21e
LW		 2429 if (!tryrsfp) {
2430 if (op->op_type == OP_REQUIRE) {
46fc3d4c 2431 SV *msg = sv_2mortal(newSVpvf("Can't locate %s in @INC", name));
2683423c
JA		 2432 SV *dirmsgsv = NEWSV(0, 0);
2433 AV *ar = GvAVn(incgv);
2434 I32 i;
46fc3d4c 2435 if (instr(SvPVX(msg), ".h "))
2436 sv_catpv(msg, " (change .h to .ph maybe?)");
2437 if (instr(SvPVX(msg), ".ph "))
2438 sv_catpv(msg, " (did you run h2ph?)");
3e3baf6d 2439 sv_catpv(msg, " (@INC contains:");
2683423c
JA		 2440 for (i = 0; i <= AvFILL(ar); i++) {
2441 char *dir = SvPVx(*av_fetch(ar, i, TRUE), na);
3e3baf6d 2442 sv_setpvf(dirmsgsv, " %s", dir);
2683423c
JA		 2443 sv_catsv(msg, dirmsgsv);
2444 }
3e3baf6d 2445 sv_catpvn(msg, ")", 1);
2683423c 2446 SvREFCNT_dec(dirmsgsv);
fc36a67e 2447 DIE("%_", msg);
a0d0e21e
LW		 2448 }
2449
2450 RETPUSHUNDEF;
2451 }
2452
2453 /* Assume success here to prevent recursive requirement. */
2454 (void)hv_store(GvHVn(incgv), name, strlen(name),
2455 newSVsv(GvSV(compiling.cop_filegv)), 0 );
2456
2457 ENTER;
2458 SAVETMPS;
2459 lex_start(sv_2mortal(newSVpv("",0)));
e50aee73
AD		 2460 if (rsfp_filters){
2461 save_aptr(&rsfp_filters);
2462 rsfp_filters = NULL;
2463 }
2464
a0d0e21e
LW		 2465 rsfp = tryrsfp;
2466 name = savepv(name);
2467 SAVEFREEPV(name);
2468 SAVEI32(hints);
2469 hints = 0;
2470
2471 /* switch to eval mode */
2472
2473 push_return(op->op_next);
2474 PUSHBLOCK(cx, CXt_EVAL, SP);
2475 PUSHEVAL(cx, name, compiling.cop_filegv);
2476
2477 compiling.cop_line = 0;
2478
2479 PUTBACK;
0f15f207
MB		 2480#ifdef USE_THREADS
2481 MUTEX_LOCK(&eval_mutex);
2482 if (eval_owner && eval_owner != thr)
2483 while (eval_owner)
2484 COND_WAIT(&eval_cond, &eval_mutex);
2485 eval_owner = thr;
2486 MUTEX_UNLOCK(&eval_mutex);
2487#endif /* USE_THREADS */
c277df42 2488 return DOCATCH(doeval(G_SCALAR, NULL));
a0d0e21e
LW		 2489}
2490
2491PP(pp_dofile)
2492{
2493 return pp_require(ARGS);
2494}
2495
2496PP(pp_entereval)
2497{
4e35701f 2498 djSP;
c09156bb 2499 register PERL_CONTEXT *cx;
a0d0e21e 2500 dPOPss;
54310121 2501 I32 gimme = GIMME_V, was = sub_generation;
fc36a67e 2502 char tmpbuf[TYPE_DIGITS(long) + 12];
2503 char *safestr;
a0d0e21e 2504 STRLEN len;
55497cff 2505 OP *ret;
a0d0e21e
LW		 2506
2507 if (!SvPV(sv,len) || !len)
2508 RETPUSHUNDEF;
748a9306 2509 TAINT_PROPER("eval");
a0d0e21e
LW		 2510
2511 ENTER;
a0d0e21e 2512 lex_start(sv);
748a9306 2513 SAVETMPS;
a0d0e21e
LW		 2514
2515 /* switch to eval mode */
2516
748a9306 2517 SAVESPTR(compiling.cop_filegv);
ff0cee69 2518 sprintf(tmpbuf, "_<(eval %lu)", (unsigned long)++evalseq);
a0d0e21e
LW		 2519 compiling.cop_filegv = gv_fetchfile(tmpbuf+2);
2520 compiling.cop_line = 1;
55497cff 2521 /* XXX For C<eval "...">s within BEGIN {} blocks, this ends up
2522 deleting the eval's FILEGV from the stash before gv_check() runs
2523 (i.e. before run-time proper). To work around the coredump that
2524 ensues, we always turn GvMULTI_on for any globals that were
2525 introduced within evals. See force_ident(). GSAR 96-10-12 */
2526 safestr = savepv(tmpbuf);
2527 SAVEDELETE(defstash, safestr, strlen(safestr));
a0d0e21e
LW		 2528 SAVEI32(hints);
2529 hints = op->op_targ;
2530
2531 push_return(op->op_next);
2532 PUSHBLOCK(cx, CXt_EVAL, SP);
2533 PUSHEVAL(cx, 0, compiling.cop_filegv);
2534
2535 /* prepare to compile string */
2536
08ea043f 2537 if (PERLDB_LINE && curstash != debstash)
a0d0e21e
LW		 2538 save_lines(GvAV(compiling.cop_filegv), linestr);
2539 PUTBACK;
0f15f207
MB		 2540#ifdef USE_THREADS
2541 MUTEX_LOCK(&eval_mutex);
2542 if (eval_owner && eval_owner != thr)
2543 while (eval_owner)
2544 COND_WAIT(&eval_cond, &eval_mutex);
2545 eval_owner = thr;
2546 MUTEX_UNLOCK(&eval_mutex);
2547#endif /* USE_THREADS */
c277df42 2548 ret = doeval(gimme, NULL);
08ea043f 2549 if (PERLDB_INTER && was != sub_generation /* Some subs defined here. */
e506e776 2550 && ret != op->op_next) { /* Successive compilation. */
55497cff 2551 strcpy(safestr, "_<(eval )"); /* Anything fake and short. */
2552 }
1e422769 2553 return DOCATCH(ret);
a0d0e21e
LW		 2554}
2555
2556PP(pp_leaveeval)
2557{
4e35701f 2558 djSP;
a0d0e21e
LW		 2559 register SV **mark;
2560 SV **newsp;
2561 PMOP *newpm;
2562 I32 gimme;
c09156bb 2563 register PERL_CONTEXT *cx;
a0d0e21e 2564 OP *retop;
760ac839 2565 U8 save_flags = op -> op_flags;
a0d0e21e
LW		 2566 I32 optype;
2567
2568 POPBLOCK(cx,newpm);
2569 POPEVAL(cx);
2570 retop = pop_return();
2571
a1f49e72 2572 TAINT_NOT;
54310121 2573 if (gimme == G_VOID)
2574 MARK = newsp;
2575 else if (gimme == G_SCALAR) {
2576 MARK = newsp + 1;
2577 if (MARK <= SP) {
2578 if (SvFLAGS(TOPs) & SVs_TEMP)
2579 *MARK = TOPs;
2580 else
2581 *MARK = sv_mortalcopy(TOPs);
2582 }
a0d0e21e 2583 else {
54310121 2584 MEXTEND(mark,0);
2585 *MARK = &sv_undef;
a0d0e21e 2586 }
a0d0e21e
LW		 2587 }
2588 else {
a1f49e72
CS		 2589 /* in case LEAVE wipes old return values */
2590 for (mark = newsp + 1; mark <= SP; mark++) {
2591 if (!(SvFLAGS(*mark) & SVs_TEMP)) {
a0d0e21e 2592 *mark = sv_mortalcopy(*mark);
a1f49e72
CS		 2593 TAINT_NOT; /* Each item is independent */
2594 }
2595 }
a0d0e21e
LW		 2596 }
2597 curpm = newpm; /* Don't pop $1 et al till now */
2598
84902520
TB		 2599 /*
2600 * Closures mentioned at top level of eval cannot be referenced
2601 * again, and their presence indirectly causes a memory leak.
2602 * (Note that the fact that compcv and friends are still set here
2603 * is, AFAIK, an accident.) --Chip
2604 */
93965878 2605 if (AvFILLp(comppad_name) >= 0) {
84902520
TB		 2606 SV **svp = AvARRAY(comppad_name);
2607 I32 ix;
93965878 2608 for (ix = AvFILLp(comppad_name); ix >= 0; ix--) {
84902520
TB		 2609 SV *sv = svp[ix];
2610 if (sv && sv != &sv_undef && *SvPVX(sv) == '&') {
2611 SvREFCNT_dec(sv);
2612 svp[ix] = &sv_undef;
2613
2614 sv = curpad[ix];
2615 if (CvCLONE(sv)) {
2616 SvREFCNT_dec(CvOUTSIDE(sv));
2617 CvOUTSIDE(sv) = Nullcv;
2618 }
2619 else {
2620 SvREFCNT_dec(sv);
2621 sv = NEWSV(0,0);
2622 SvPADTMP_on(sv);
2623 curpad[ix] = sv;
2624 }
2625 }
2626 }
2627 }
2628
4fdae800 2629#ifdef DEBUGGING
2630 assert(CvDEPTH(compcv) == 1);
2631#endif
2632 CvDEPTH(compcv) = 0;
f46d017c 2633 lex_end();
4fdae800 2634
1ce6579f 2635 if (optype == OP_REQUIRE &&
54310121 2636 !(gimme == G_SCALAR ? SvTRUE(*sp) : sp > newsp))
2637 {
1ce6579f 2638 /* Unassume the success we assumed earlier. */
54310121 2639 char *name = cx->blk_eval.old_name;
1ce6579f 2640 (void)hv_delete(GvHVn(incgv), name, strlen(name), G_DISCARD);
2641 retop = die("%s did not return a true value", name);
f46d017c
GS		 2642 /* die_where() did LEAVE, or we won't be here */
2643 }
2644 else {
2645 LEAVE;
2646 if (!(save_flags & OPf_SPECIAL))
2647 sv_setpv(ERRSV,"");
a0d0e21e 2648 }
a0d0e21e
LW		 2649
2650 RETURNOP(retop);
2651}
2652
a0d0e21e
LW		 2653PP(pp_entertry)
2654{
4e35701f 2655 djSP;
c09156bb 2656 register PERL_CONTEXT *cx;
54310121 2657 I32 gimme = GIMME_V;
a0d0e21e
LW		 2658
2659 ENTER;
2660 SAVETMPS;
2661
2662 push_return(cLOGOP->op_other->op_next);
2663 PUSHBLOCK(cx, CXt_EVAL, SP);
2664 PUSHEVAL(cx, 0, 0);
2665 eval_root = op; /* Only needed so that goto works right. */
2666
2667 in_eval = 1;
38a03e6e 2668 sv_setpv(ERRSV,"");
1e422769 2669 PUTBACK;
2670 return DOCATCH(op->op_next);
a0d0e21e
LW		 2671}
2672
2673PP(pp_leavetry)
2674{
4e35701f 2675 djSP;
a0d0e21e
LW		 2676 register SV **mark;
2677 SV **newsp;
2678 PMOP *newpm;
2679 I32 gimme;
c09156bb 2680 register PERL_CONTEXT *cx;
a0d0e21e
LW		 2681 I32 optype;
2682
2683 POPBLOCK(cx,newpm);
2684 POPEVAL(cx);
2685 pop_return();
2686
a1f49e72 2687 TAINT_NOT;
54310121 2688 if (gimme == G_VOID)
2689 SP = newsp;
2690 else if (gimme == G_SCALAR) {
2691 MARK = newsp + 1;
2692 if (MARK <= SP) {
2693 if (SvFLAGS(TOPs) & (SVs_PADTMP|SVs_TEMP))
2694 *MARK = TOPs;
2695 else
2696 *MARK = sv_mortalcopy(TOPs);
2697 }
a0d0e21e 2698 else {
54310121 2699 MEXTEND(mark,0);
2700 *MARK = &sv_undef;
a0d0e21e
LW		 2701 }
2702 SP = MARK;
2703 }
2704 else {
a1f49e72
CS		 2705 /* in case LEAVE wipes old return values */
2706 for (mark = newsp + 1; mark <= SP; mark++) {
2707 if (!(SvFLAGS(*mark) & (SVs_PADTMP|SVs_TEMP))) {
a0d0e21e 2708 *mark = sv_mortalcopy(*mark);
a1f49e72
CS		 2709 TAINT_NOT; /* Each item is independent */
2710 }
2711 }
a0d0e21e
LW		 2712 }
2713 curpm = newpm; /* Don't pop $1 et al till now */
2714
2715 LEAVE;
38a03e6e 2716 sv_setpv(ERRSV,"");
a0d0e21e
LW		 2717 RETURN;
2718}
2719
2720static void
8ac85365 2721doparseform(SV *sv)
a0d0e21e
LW		 2722{
2723 STRLEN len;
2724 register char *s = SvPV_force(sv, len);
2725 register char *send = s + len;
2726 register char *base;
2727 register I32 skipspaces = 0;
2728 bool noblank;
2729 bool repeat;
2730 bool postspace = FALSE;
2731 U16 *fops;
2732 register U16 *fpc;
2733 U16 *linepc;
2734 register I32 arg;
2735 bool ischop;
2736
55497cff 2737 if (len == 0)
bbce6d69 2738 croak("Null picture in formline");
55497cff 2739
2740 New(804, fops, (send - s)*3+10, U16); /* Almost certainly too long... */
a0d0e21e
LW		 2741 fpc = fops;
2742
2743 if (s < send) {
2744 linepc = fpc;
2745 *fpc++ = FF_LINEMARK;
2746 noblank = repeat = FALSE;
2747 base = s;
2748 }
2749
2750 while (s <= send) {
2751 switch (*s++) {
2752 default:
2753 skipspaces = 0;
2754 continue;
2755
2756 case '~':
2757 if (*s == '~') {
2758 repeat = TRUE;
2759 *s = ' ';
2760 }
2761 noblank = TRUE;
2762 s[-1] = ' ';
2763 /* FALL THROUGH */
2764 case ' ': case '\t':
2765 skipspaces++;
2766 continue;
2767
2768 case '\n': case 0:
2769 arg = s - base;
2770 skipspaces++;
2771 arg -= skipspaces;
2772 if (arg) {
5f05dabc 2773 if (postspace)
a0d0e21e 2774 *fpc++ = FF_SPACE;
a0d0e21e
LW		 2775 *fpc++ = FF_LITERAL;
2776 *fpc++ = arg;
2777 }
5f05dabc 2778 postspace = FALSE;
a0d0e21e
LW		 2779 if (s <= send)
2780 skipspaces--;
2781 if (skipspaces) {
2782 *fpc++ = FF_SKIP;
2783 *fpc++ = skipspaces;
2784 }
2785 skipspaces = 0;
2786 if (s <= send)
2787 *fpc++ = FF_NEWLINE;
2788 if (noblank) {
2789 *fpc++ = FF_BLANK;
2790 if (repeat)
2791 arg = fpc - linepc + 1;
2792 else
2793 arg = 0;
2794 *fpc++ = arg;
2795 }
2796 if (s < send) {
2797 linepc = fpc;
2798 *fpc++ = FF_LINEMARK;
2799 noblank = repeat = FALSE;
2800 base = s;
2801 }
2802 else
2803 s++;
2804 continue;
2805
2806 case '@':
2807 case '^':
2808 ischop = s[-1] == '^';
2809
2810 if (postspace) {
2811 *fpc++ = FF_SPACE;
2812 postspace = FALSE;
2813 }
2814 arg = (s - base) - 1;
2815 if (arg) {
2816 *fpc++ = FF_LITERAL;
2817 *fpc++ = arg;
2818 }
2819
2820 base = s - 1;
2821 *fpc++ = FF_FETCH;
2822 if (*s == '*') {
2823 s++;
2824 *fpc++ = 0;
2825 *fpc++ = FF_LINEGLOB;
2826 }
2827 else if (*s == '#' || (*s == '.' && s[1] == '#')) {
2828 arg = ischop ? 512 : 0;
2829 base = s - 1;
2830 while (*s == '#')
2831 s++;
2832 if (*s == '.') {
2833 char *f;
2834 s++;
2835 f = s;
2836 while (*s == '#')
2837 s++;
2838 arg |= 256 + (s - f);
2839 }
2840 *fpc++ = s - base; /* fieldsize for FETCH */
2841 *fpc++ = FF_DECIMAL;
2842 *fpc++ = arg;
2843 }
2844 else {
2845 I32 prespace = 0;
2846 bool ismore = FALSE;
2847
2848 if (*s == '>') {
2849 while (*++s == '>') ;
2850 prespace = FF_SPACE;
2851 }
2852 else if (*s == '|') {
2853 while (*++s == '|') ;
2854 prespace = FF_HALFSPACE;
2855 postspace = TRUE;
2856 }
2857 else {
2858 if (*s == '<')
2859 while (*++s == '<') ;
2860 postspace = TRUE;
2861 }
2862 if (*s == '.' && s[1] == '.' && s[2] == '.') {
2863 s += 3;
2864 ismore = TRUE;
2865 }
2866 *fpc++ = s - base; /* fieldsize for FETCH */
2867
2868 *fpc++ = ischop ? FF_CHECKCHOP : FF_CHECKNL;
2869
2870 if (prespace)
2871 *fpc++ = prespace;
2872 *fpc++ = FF_ITEM;
2873 if (ismore)
2874 *fpc++ = FF_MORE;
2875 if (ischop)
2876 *fpc++ = FF_CHOP;
2877 }
2878 base = s;
2879 skipspaces = 0;
2880 continue;
2881 }
2882 }
2883 *fpc++ = FF_END;
2884
2885 arg = fpc - fops;
2886 { /* need to jump to the next word */
2887 int z;
2888 z = WORD_ALIGN - SvCUR(sv) % WORD_ALIGN;
2889 SvGROW(sv, SvCUR(sv) + z + arg * sizeof(U16) + 4);
2890 s = SvPVX(sv) + SvCUR(sv) + z;
2891 }
2892 Copy(fops, s, arg, U16);
2893 Safefree(fops);
55497cff 2894 sv_magic(sv, Nullsv, 'f', Nullch, 0);
a0d0e21e
LW		 2895 SvCOMPILED_on(sv);
2896}
4e35701f 2897
745d3a65
HM		 2898/*
2899 * The rest of this file was derived from source code contributed
2900 * by Tom Horsley.
2901 *
2902 * NOTE: this code was derived from Tom Horsley's qsort replacement
2903 * and should not be confused with the original code.
2904 */
2905
2906/* Copyright (C) Tom Horsley, 1997. All rights reserved.
2907
2908 Permission granted to distribute under the same terms as perl which are
2909 (briefly):
2910
2911 This program is free software; you can redistribute it and/or modify
2912 it under the terms of either:
2913
2914 a) the GNU General Public License as published by the Free
2915 Software Foundation; either version 1, or (at your option) any
2916 later version, or
2917
2918 b) the "Artistic License" which comes with this Kit.
2919
2920 Details on the perl license can be found in the perl source code which
2921 may be located via the www.perl.com web page.
2922
2923 This is the most wonderfulest possible qsort I can come up with (and
2924 still be mostly portable) My (limited) tests indicate it consistently
2925 does about 20% fewer calls to compare than does the qsort in the Visual
2926 C++ library, other vendors may vary.
2927
2928 Some of the ideas in here can be found in "Algorithms" by Sedgewick,
2929 others I invented myself (or more likely re-invented since they seemed
2930 pretty obvious once I watched the algorithm operate for a while).
2931
2932 Most of this code was written while watching the Marlins sweep the Giants
2933 in the 1997 National League Playoffs - no Braves fans allowed to use this
2934 code (just kidding :-).
2935
2936 I realize that if I wanted to be true to the perl tradition, the only
2937 comment in this file would be something like:
2938
2939 ...they shuffled back towards the rear of the line. 'No, not at the
2940 rear!' the slave-driver shouted. 'Three files up. And stay there...
2941
2942 However, I really needed to violate that tradition just so I could keep
2943 track of what happens myself, not to mention some poor fool trying to
2944 understand this years from now :-).
2945*/
2946
2947/* ********************************************************** Configuration */
2948
2949#ifndef QSORT_ORDER_GUESS
2950#define QSORT_ORDER_GUESS 2 /* Select doubling version of the netBSD trick */
2951#endif
2952
2953/* QSORT_MAX_STACK is the largest number of partitions that can be stacked up for
2954 future processing - a good max upper bound is log base 2 of memory size
2955 (32 on 32 bit machines, 64 on 64 bit machines, etc). In reality can
2956 safely be smaller than that since the program is taking up some space and
2957 most operating systems only let you grab some subset of contiguous
2958 memory (not to mention that you are normally sorting data larger than
2959 1 byte element size :-).
2960*/
2961#ifndef QSORT_MAX_STACK
2962#define QSORT_MAX_STACK 32
2963#endif
2964
2965/* QSORT_BREAK_EVEN is the size of the largest partition we should insertion sort.
2966 Anything bigger and we use qsort. If you make this too small, the qsort
2967 will probably break (or become less efficient), because it doesn't expect
2968 the middle element of a partition to be the same as the right or left -
2969 you have been warned).
2970*/
2971#ifndef QSORT_BREAK_EVEN
2972#define QSORT_BREAK_EVEN 6
2973#endif
2974
2975/* ************************************************************* Data Types */
2976
2977/* hold left and right index values of a partition waiting to be sorted (the
2978 partition includes both left and right - right is NOT one past the end or
2979 anything like that).
2980*/
2981struct partition_stack_entry {
2982 int left;
2983 int right;
2984#ifdef QSORT_ORDER_GUESS
2985 int qsort_break_even;
2986#endif
2987};
2988
2989/* ******************************************************* Shorthand Macros */
2990
2991/* Note that these macros will be used from inside the qsort function where
2992 we happen to know that the variable 'elt_size' contains the size of an
2993 array element and the variable 'temp' points to enough space to hold a
2994 temp element and the variable 'array' points to the array being sorted
2995 and 'compare' is the pointer to the compare routine.
2996
2997 Also note that there are very many highly architecture specific ways
2998 these might be sped up, but this is simply the most generally portable
2999 code I could think of.
3000*/
3001
3002/* Return < 0 == 0 or > 0 as the value of elt1 is < elt2, == elt2, > elt2
3003*/
3004#define qsort_cmp(elt1, elt2) \
3005 ((*compare)(array[elt1], array[elt2]))
3006
3007#ifdef QSORT_ORDER_GUESS
3008#define QSORT_NOTICE_SWAP swapped++;
3009#else
3010#define QSORT_NOTICE_SWAP
3011#endif
3012
3013/* swaps contents of array elements elt1, elt2.
3014*/
3015#define qsort_swap(elt1, elt2) \
3016 STMT_START { \
3017 QSORT_NOTICE_SWAP \
3018 temp = array[elt1]; \
3019 array[elt1] = array[elt2]; \
3020 array[elt2] = temp; \
3021 } STMT_END
3022
3023/* rotate contents of elt1, elt2, elt3 such that elt1 gets elt2, elt2 gets
3024 elt3 and elt3 gets elt1.
3025*/
3026#define qsort_rotate(elt1, elt2, elt3) \
3027 STMT_START { \
3028 QSORT_NOTICE_SWAP \
3029 temp = array[elt1]; \
3030 array[elt1] = array[elt2]; \
3031 array[elt2] = array[elt3]; \
3032 array[elt3] = temp; \
3033 } STMT_END
3034
3035/* ************************************************************ Debug stuff */
3036
3037#ifdef QSORT_DEBUG
3038
3039static void
3040break_here()
3041{
3042 return; /* good place to set a breakpoint */
3043}
3044
3045#define qsort_assert(t) (void)( (t) || (break_here(), 0) )
3046
3047static void
3048doqsort_all_asserts(
3049 void * array,
3050 size_t num_elts,
3051 size_t elt_size,
3052 int (*compare)(const void * elt1, const void * elt2),
3053 int pc_left, int pc_right, int u_left, int u_right)
3054{
3055 int i;
3056
3057 qsort_assert(pc_left <= pc_right);
3058 qsort_assert(u_right < pc_left);
3059 qsort_assert(pc_right < u_left);
3060 for (i = u_right + 1; i < pc_left; ++i) {
3061 qsort_assert(qsort_cmp(i, pc_left) < 0);
3062 }
3063 for (i = pc_left; i < pc_right; ++i) {
3064 qsort_assert(qsort_cmp(i, pc_right) == 0);
3065 }
3066 for (i = pc_right + 1; i < u_left; ++i) {
3067 qsort_assert(qsort_cmp(pc_right, i) < 0);
3068 }
3069}
3070
3071#define qsort_all_asserts(PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT) \
3072 doqsort_all_asserts(array, num_elts, elt_size, compare, \
3073 PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT)
3074
3075#else
3076
3077#define qsort_assert(t) ((void)0)
3078
3079#define qsort_all_asserts(PC_LEFT, PC_RIGHT, U_LEFT, U_RIGHT) ((void)0)
3080
3081#endif
3082
3083/* ****************************************************************** qsort */
3084
3085void
3086qsortsv(
3087 SV ** array,
3088 size_t num_elts,
3089 I32 (*compare)(SV *a, SV *b))
3090{
3091 register SV * temp;
3092
3093 struct partition_stack_entry partition_stack[QSORT_MAX_STACK];
3094 int next_stack_entry = 0;
3095
3096 int part_left;
3097 int part_right;
3098#ifdef QSORT_ORDER_GUESS
3099 int qsort_break_even;
3100 int swapped;
3101#endif
161b471a 3102
745d3a65
HM		 3103 /* Make sure we actually have work to do.
3104 */
3105 if (num_elts <= 1) {
3106 return;
3107 }
3108
3109 /* Setup the initial partition definition and fall into the sorting loop
3110 */
3111 part_left = 0;
3112 part_right = (int)(num_elts - 1);
3113#ifdef QSORT_ORDER_GUESS
3114 qsort_break_even = QSORT_BREAK_EVEN;
3115#else
3116#define qsort_break_even QSORT_BREAK_EVEN
3117#endif
3118 for ( ; ; ) {
3119 if ((part_right - part_left) >= qsort_break_even) {
3120 /* OK, this is gonna get hairy, so lets try to document all the
3121 concepts and abbreviations and variables and what they keep
3122 track of:
3123
3124 pc: pivot chunk - the set of array elements we accumulate in the
3125 middle of the partition, all equal in value to the original
3126 pivot element selected. The pc is defined by:
3127
3128 pc_left - the leftmost array index of the pc
3129 pc_right - the rightmost array index of the pc
3130
3131 we start with pc_left == pc_right and only one element
3132 in the pivot chunk (but it can grow during the scan).
3133
3134 u: uncompared elements - the set of elements in the partition
3135 we have not yet compared to the pivot value. There are two
3136 uncompared sets during the scan - one to the left of the pc
3137 and one to the right.
3138
3139 u_right - the rightmost index of the left side's uncompared set
3140 u_left - the leftmost index of the right side's uncompared set
3141
3142 The leftmost index of the left sides's uncompared set
3143 doesn't need its own variable because it is always defined
3144 by the leftmost edge of the whole partition (part_left). The
3145 same goes for the rightmost edge of the right partition
3146 (part_right).
3147
3148 We know there are no uncompared elements on the left once we
3149 get u_right < part_left and no uncompared elements on the
3150 right once u_left > part_right. When both these conditions
3151 are met, we have completed the scan of the partition.
3152
3153 Any elements which are between the pivot chunk and the
3154 uncompared elements should be less than the pivot value on
3155 the left side and greater than the pivot value on the right
3156 side (in fact, the goal of the whole algorithm is to arrange
3157 for that to be true and make the groups of less-than and
3158 greater-then elements into new partitions to sort again).
3159
3160 As you marvel at the complexity of the code and wonder why it
3161 has to be so confusing. Consider some of the things this level
3162 of confusion brings:
3163
3164 Once I do a compare, I squeeze every ounce of juice out of it. I
3165 never do compare calls I don't have to do, and I certainly never
3166 do redundant calls.
3167
3168 I also never swap any elements unless I can prove there is a
3169 good reason. Many sort algorithms will swap a known value with
3170 an uncompared value just to get things in the right place (or
3171 avoid complexity :-), but that uncompared value, once it gets
3172 compared, may then have to be swapped again. A lot of the
3173 complexity of this code is due to the fact that it never swaps
3174 anything except compared values, and it only swaps them when the
3175 compare shows they are out of position.
3176 */
3177 int pc_left, pc_right;
3178 int u_right, u_left;
3179
3180 int s;
3181
3182 pc_left = ((part_left + part_right) / 2);
3183 pc_right = pc_left;
3184 u_right = pc_left - 1;
3185 u_left = pc_right + 1;
3186
3187 /* Qsort works best when the pivot value is also the median value
3188 in the partition (unfortunately you can't find the median value
3189 without first sorting :-), so to give the algorithm a helping
3190 hand, we pick 3 elements and sort them and use the median value
3191 of that tiny set as the pivot value.
3192
3193 Some versions of qsort like to use the left middle and right as
3194 the 3 elements to sort so they can insure the ends of the
3195 partition will contain values which will stop the scan in the
3196 compare loop, but when you have to call an arbitrarily complex
3197 routine to do a compare, its really better to just keep track of
3198 array index values to know when you hit the edge of the
3199 partition and avoid the extra compare. An even better reason to
3200 avoid using a compare call is the fact that you can drop off the
3201 edge of the array if someone foolishly provides you with an
3202 unstable compare function that doesn't always provide consistent
3203 results.
3204
3205 So, since it is simpler for us to compare the three adjacent
3206 elements in the middle of the partition, those are the ones we
3207 pick here (conveniently pointed at by u_right, pc_left, and
3208 u_left). The values of the left, center, and right elements
3209 are refered to as l c and r in the following comments.
3210 */
3211
3212#ifdef QSORT_ORDER_GUESS
3213 swapped = 0;
3214#endif
3215 s = qsort_cmp(u_right, pc_left);
3216 if (s < 0) {
3217 /* l < c */
3218 s = qsort_cmp(pc_left, u_left);
3219 /* if l < c, c < r - already in order - nothing to do */
3220 if (s == 0) {
3221 /* l < c, c == r - already in order, pc grows */
3222 ++pc_right;
3223 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3224 } else if (s > 0) {
3225 /* l < c, c > r - need to know more */
3226 s = qsort_cmp(u_right, u_left);
3227 if (s < 0) {
3228 /* l < c, c > r, l < r - swap c & r to get ordered */
3229 qsort_swap(pc_left, u_left);
3230 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3231 } else if (s == 0) {
3232 /* l < c, c > r, l == r - swap c&r, grow pc */
3233 qsort_swap(pc_left, u_left);
3234 --pc_left;
3235 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3236 } else {
3237 /* l < c, c > r, l > r - make lcr into rlc to get ordered */
3238 qsort_rotate(pc_left, u_right, u_left);
3239 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3240 }
3241 }
3242 } else if (s == 0) {
3243 /* l == c */
3244 s = qsort_cmp(pc_left, u_left);
3245 if (s < 0) {
3246 /* l == c, c < r - already in order, grow pc */
3247 --pc_left;
3248 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3249 } else if (s == 0) {
3250 /* l == c, c == r - already in order, grow pc both ways */
3251 --pc_left;
3252 ++pc_right;
3253 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3254 } else {
3255 /* l == c, c > r - swap l & r, grow pc */
3256 qsort_swap(u_right, u_left);
3257 ++pc_right;
3258 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3259 }
3260 } else {
3261 /* l > c */
3262 s = qsort_cmp(pc_left, u_left);
3263 if (s < 0) {
3264 /* l > c, c < r - need to know more */
3265 s = qsort_cmp(u_right, u_left);
3266 if (s < 0) {
3267 /* l > c, c < r, l < r - swap l & c to get ordered */
3268 qsort_swap(u_right, pc_left);
3269 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3270 } else if (s == 0) {
3271 /* l > c, c < r, l == r - swap l & c, grow pc */
3272 qsort_swap(u_right, pc_left);
3273 ++pc_right;
3274 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3275 } else {
3276 /* l > c, c < r, l > r - rotate lcr into crl to order */
3277 qsort_rotate(u_right, pc_left, u_left);
3278 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3279 }
3280 } else if (s == 0) {
3281 /* l > c, c == r - swap ends, grow pc */
3282 qsort_swap(u_right, u_left);
3283 --pc_left;
3284 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3285 } else {
3286 /* l > c, c > r - swap ends to get in order */
3287 qsort_swap(u_right, u_left);
3288 qsort_all_asserts(pc_left, pc_right, u_left + 1, u_right - 1);
3289 }
3290 }
3291 /* We now know the 3 middle elements have been compared and
3292 arranged in the desired order, so we can shrink the uncompared
3293 sets on both sides
3294 */
3295 --u_right;
3296 ++u_left;
3297 qsort_all_asserts(pc_left, pc_right, u_left, u_right);
3298
3299 /* The above massive nested if was the simple part :-). We now have
3300 the middle 3 elements ordered and we need to scan through the
3301 uncompared sets on either side, swapping elements that are on
3302 the wrong side or simply shuffling equal elements around to get
3303 all equal elements into the pivot chunk.
3304 */
3305
3306 for ( ; ; ) {
3307 int still_work_on_left;
3308 int still_work_on_right;
3309
3310 /* Scan the uncompared values on the left. If I find a value
3311 equal to the pivot value, move it over so it is adjacent to
3312 the pivot chunk and expand the pivot chunk. If I find a value
3313 less than the pivot value, then just leave it - its already
3314 on the correct side of the partition. If I find a greater
3315 value, then stop the scan.
3316 */
3317 while (still_work_on_left = (u_right >= part_left)) {
3318 s = qsort_cmp(u_right, pc_left);
3319 if (s < 0) {
3320 --u_right;
3321 } else if (s == 0) {
3322 --pc_left;
3323 if (pc_left != u_right) {
3324 qsort_swap(u_right, pc_left);
3325 }
3326 --u_right;
3327 } else {
3328 break;
3329 }
3330 qsort_assert(u_right < pc_left);
3331 qsort_assert(pc_left <= pc_right);
3332 qsort_assert(qsort_cmp(u_right + 1, pc_left) <= 0);
3333 qsort_assert(qsort_cmp(pc_left, pc_right) == 0);
3334 }
3335
3336 /* Do a mirror image scan of uncompared values on the right
3337 */
3338 while (still_work_on_right = (u_left <= part_right)) {
3339 s = qsort_cmp(pc_right, u_left);
3340 if (s < 0) {
3341 ++u_left;
3342 } else if (s == 0) {
3343 ++pc_right;
3344 if (pc_right != u_left) {
3345 qsort_swap(pc_right, u_left);
3346 }
3347 ++u_left;
3348 } else {
3349 break;
3350 }
3351 qsort_assert(u_left > pc_right);
3352 qsort_assert(pc_left <= pc_right);
3353 qsort_assert(qsort_cmp(pc_right, u_left - 1) <= 0);
3354 qsort_assert(qsort_cmp(pc_left, pc_right) == 0);
3355 }
3356
3357 if (still_work_on_left) {
3358 /* I know I have a value on the left side which needs to be
3359 on the right side, but I need to know more to decide
3360 exactly the best thing to do with it.
3361 */
3362 if (still_work_on_right) {
3363 /* I know I have values on both side which are out of
3364 position. This is a big win because I kill two birds
3365 with one swap (so to speak). I can advance the
3366 uncompared pointers on both sides after swapping both
3367 of them into the right place.
3368 */
3369 qsort_swap(u_right, u_left);
3370 --u_right;
3371 ++u_left;
3372 qsort_all_asserts(pc_left, pc_right, u_left, u_right);
3373 } else {
3374 /* I have an out of position value on the left, but the
3375 right is fully scanned, so I "slide" the pivot chunk
3376 and any less-than values left one to make room for the
3377 greater value over on the right. If the out of position
3378 value is immediately adjacent to the pivot chunk (there
3379 are no less-than values), I can do that with a swap,
3380 otherwise, I have to rotate one of the less than values
3381 into the former position of the out of position value
3382 and the right end of the pivot chunk into the left end
3383 (got all that?).
3384 */
3385 --pc_left;
3386 if (pc_left == u_right) {
3387 qsort_swap(u_right, pc_right);
3388 qsort_all_asserts(pc_left, pc_right-1, u_left, u_right-1);
3389 } else {
3390 qsort_rotate(u_right, pc_left, pc_right);
3391 qsort_all_asserts(pc_left, pc_right-1, u_left, u_right-1);
3392 }
3393 --pc_right;
3394 --u_right;
3395 }
3396 } else if (still_work_on_right) {
3397 /* Mirror image of complex case above: I have an out of
3398 position value on the right, but the left is fully
3399 scanned, so I need to shuffle things around to make room
3400 for the right value on the left.
3401 */
3402 ++pc_right;
3403 if (pc_right == u_left) {
3404 qsort_swap(u_left, pc_left);
3405 qsort_all_asserts(pc_left+1, pc_right, u_left+1, u_right);
3406 } else {
3407 qsort_rotate(pc_right, pc_left, u_left);
3408 qsort_all_asserts(pc_left+1, pc_right, u_left+1, u_right);
3409 }
3410 ++pc_left;
3411 ++u_left;
3412 } else {
3413 /* No more scanning required on either side of partition,
3414 break out of loop and figure out next set of partitions
3415 */
3416 break;
3417 }
3418 }
3419
3420 /* The elements in the pivot chunk are now in the right place. They
3421 will never move or be compared again. All I have to do is decide
3422 what to do with the stuff to the left and right of the pivot
3423 chunk.
3424
3425 Notes on the QSORT_ORDER_GUESS ifdef code:
3426
3427 1. If I just built these partitions without swapping any (or
3428 very many) elements, there is a chance that the elements are
3429 already ordered properly (being properly ordered will
3430 certainly result in no swapping, but the converse can't be
3431 proved :-).
3432
3433 2. A (properly written) insertion sort will run faster on
3434 already ordered data than qsort will.
3435
3436 3. Perhaps there is some way to make a good guess about
3437 switching to an insertion sort earlier than partition size 6
3438 (for instance - we could save the partition size on the stack
3439 and increase the size each time we find we didn't swap, thus
3440 switching to insertion sort earlier for partitions with a
3441 history of not swapping).
3442
3443 4. Naturally, if I just switch right away, it will make
3444 artificial benchmarks with pure ascending (or descending)
3445 data look really good, but is that a good reason in general?
3446 Hard to say...
3447 */
3448
3449#ifdef QSORT_ORDER_GUESS
3450 if (swapped < 3) {
3451#if QSORT_ORDER_GUESS == 1
3452 qsort_break_even = (part_right - part_left) + 1;
3453#endif
3454#if QSORT_ORDER_GUESS == 2
3455 qsort_break_even *= 2;
3456#endif
3457#if QSORT_ORDER_GUESS == 3
3458 int prev_break = qsort_break_even;
3459 qsort_break_even *= qsort_break_even;
3460 if (qsort_break_even < prev_break) {
3461 qsort_break_even = (part_right - part_left) + 1;
3462 }
3463#endif
3464 } else {
3465 qsort_break_even = QSORT_BREAK_EVEN;
3466 }
3467#endif
3468
3469 if (part_left < pc_left) {
3470 /* There are elements on the left which need more processing.
3471 Check the right as well before deciding what to do.
3472 */
3473 if (pc_right < part_right) {
3474 /* We have two partitions to be sorted. Stack the biggest one
3475 and process the smallest one on the next iteration. This
3476 minimizes the stack height by insuring that any additional
3477 stack entries must come from the smallest partition which
3478 (because it is smallest) will have the fewest
3479 opportunities to generate additional stack entries.
3480 */
3481 if ((part_right - pc_right) > (pc_left - part_left)) {
3482 /* stack the right partition, process the left */
3483 partition_stack[next_stack_entry].left = pc_right + 1;
3484 partition_stack[next_stack_entry].right = part_right;
3485#ifdef QSORT_ORDER_GUESS
3486 partition_stack[next_stack_entry].qsort_break_even = qsort_break_even;
3487#endif
3488 part_right = pc_left - 1;
3489 } else {
3490 /* stack the left partition, process the right */
3491 partition_stack[next_stack_entry].left = part_left;
3492 partition_stack[next_stack_entry].right = pc_left - 1;
3493#ifdef QSORT_ORDER_GUESS
3494 partition_stack[next_stack_entry].qsort_break_even = qsort_break_even;
3495#endif
3496 part_left = pc_right + 1;
3497 }
3498 qsort_assert(next_stack_entry < QSORT_MAX_STACK);
3499 ++next_stack_entry;
3500 } else {
3501 /* The elements on the left are the only remaining elements
3502 that need sorting, arrange for them to be processed as the
3503 next partition.
3504 */
3505 part_right = pc_left - 1;
3506 }
3507 } else if (pc_right < part_right) {
3508 /* There is only one chunk on the right to be sorted, make it
3509 the new partition and loop back around.
3510 */
3511 part_left = pc_right + 1;
3512 } else {
3513 /* This whole partition wound up in the pivot chunk, so
3514 we need to get a new partition off the stack.
3515 */
3516 if (next_stack_entry == 0) {
3517 /* the stack is empty - we are done */
3518 break;
3519 }
3520 --next_stack_entry;
3521 part_left = partition_stack[next_stack_entry].left;
3522 part_right = partition_stack[next_stack_entry].right;
3523#ifdef QSORT_ORDER_GUESS
3524 qsort_break_even = partition_stack[next_stack_entry].qsort_break_even;
3525#endif
3526 }
3527 } else {
3528 /* This partition is too small to fool with qsort complexity, just
3529 do an ordinary insertion sort to minimize overhead.
3530 */
3531 int i;
3532 /* Assume 1st element is in right place already, and start checking
3533 at 2nd element to see where it should be inserted.
3534 */
3535 for (i = part_left + 1; i <= part_right; ++i) {
3536 int j;
3537 /* Scan (backwards - just in case 'i' is already in right place)
3538 through the elements already sorted to see if the ith element
3539 belongs ahead of one of them.
3540 */
3541 for (j = i - 1; j >= part_left; --j) {
3542 if (qsort_cmp(i, j) >= 0) {
3543 /* i belongs right after j
3544 */
3545 break;
3546 }
3547 }
3548 ++j;
3549 if (j != i) {
3550 /* Looks like we really need to move some things
3551 */
3552 temp = array[i];
3553 for (--i; i >= j; --i)
3554 array[i + 1] = array[i];
3555 array[j] = temp;
3556 }
3557 }
3558
3559 /* That partition is now sorted, grab the next one, or get out
3560 of the loop if there aren't any more.
3561 */
3562
3563 if (next_stack_entry == 0) {
3564 /* the stack is empty - we are done */
3565 break;
3566 }
3567 --next_stack_entry;
3568 part_left = partition_stack[next_stack_entry].left;
3569 part_right = partition_stack[next_stack_entry].right;
3570#ifdef QSORT_ORDER_GUESS
3571 qsort_break_even = partition_stack[next_stack_entry].qsort_break_even;
3572#endif
3573 }
3574 }
3575
3576 /* Believe it or not, the array is sorted at this point! */
3577}
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