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perl 5.002beta1h patch: Configure
[p5sagit/p5-mst-13.2.git] / gv.c
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a0d0e21e 1/* gv.c
79072805 2 *
a0d0e21e 3 * Copyright (c) 1991-1994, Larry Wall
79072805 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 *
a0d0e21e 8 */
9
10/*
11 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
12 * of your inquisitiveness, I shall spend all the rest of my days answering
13 * you. What more do you want to know?'
14 * 'The names of all the stars, and of all living things, and the whole
15 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
16 * laughed Pippin.
79072805 17 */
18
19#include "EXTERN.h"
20#include "perl.h"
21
463ee0b2 22extern char rcsid[];
93a17b20 23
79072805 24GV *
25gv_AVadd(gv)
26register GV *gv;
27{
a0d0e21e 28 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
29 croak("Bad symbol for array");
79072805 30 if (!GvAV(gv))
31 GvAV(gv) = newAV();
32 return gv;
33}
34
35GV *
36gv_HVadd(gv)
37register GV *gv;
38{
a0d0e21e 39 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
40 croak("Bad symbol for hash");
79072805 41 if (!GvHV(gv))
463ee0b2 42 GvHV(gv) = newHV();
79072805 43 return gv;
44}
45
46GV *
a0d0e21e 47gv_IOadd(gv)
48register GV *gv;
49{
50 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
51 croak("Bad symbol for filehandle");
52 if (!GvIOp(gv))
53 GvIOp(gv) = newIO();
54 return gv;
55}
56
57GV *
79072805 58gv_fetchfile(name)
59char *name;
60{
61 char tmpbuf[1200];
62 GV *gv;
63
8990e307 64 sprintf(tmpbuf,"::_<%s", name);
85e6fe83 65 gv = gv_fetchpv(tmpbuf, TRUE, SVt_PVGV);
79072805 66 sv_setpv(GvSV(gv), name);
a0d0e21e 67 if (*name == '/' && (instr(name,"/lib/") || instr(name,".pm")))
8990e307 68 SvMULTI_on(gv);
79072805 69 if (perldb)
93a17b20 70 hv_magic(GvHVn(gv_AVadd(gv)), gv, 'L');
79072805 71 return gv;
72}
73
463ee0b2 74void
75gv_init(gv, stash, name, len, multi)
76GV *gv;
77HV *stash;
78char *name;
79STRLEN len;
80int multi;
81{
82 register GP *gp;
83
84 sv_upgrade(gv, SVt_PVGV);
85 if (SvLEN(gv))
86 Safefree(SvPVX(gv));
87 Newz(602,gp, 1, GP);
8990e307 88 GvGP(gv) = gp_ref(gp);
463ee0b2 89 GvREFCNT(gv) = 1;
90 GvSV(gv) = NEWSV(72,0);
91 GvLINE(gv) = curcop->cop_line;
8990e307 92 GvFILEGV(gv) = curcop->cop_filegv;
463ee0b2 93 GvEGV(gv) = gv;
94 sv_magic((SV*)gv, (SV*)gv, '*', name, len);
95 GvSTASH(gv) = stash;
a0d0e21e 96 GvNAME(gv) = savepvn(name, len);
463ee0b2 97 GvNAMELEN(gv) = len;
98 if (multi)
99 SvMULTI_on(gv);
100}
101
a0d0e21e 102static void
103gv_init_sv(gv, sv_type)
104GV* gv;
105I32 sv_type;
106{
107 switch (sv_type) {
108 case SVt_PVIO:
109 (void)GvIOn(gv);
110 break;
111 case SVt_PVAV:
112 (void)GvAVn(gv);
113 break;
114 case SVt_PVHV:
115 (void)GvHVn(gv);
116 break;
117 }
118}
119
79072805 120GV *
a0d0e21e 121gv_fetchmeth(stash, name, len, level)
79072805 122HV* stash;
123char* name;
463ee0b2 124STRLEN len;
a0d0e21e 125I32 level;
79072805 126{
127 AV* av;
463ee0b2 128 GV* topgv;
79072805 129 GV* gv;
463ee0b2 130 GV** gvp;
a0d0e21e 131 HV* lastchance;
748a9306 132 CV* cv;
a0d0e21e 133
134 if (!stash)
135 return 0;
136 if (level > 100)
137 croak("Recursive inheritance detected");
463ee0b2 138
139 gvp = (GV**)hv_fetch(stash, name, len, TRUE);
140
141 DEBUG_o( deb("Looking for method %s in package %s\n",name,HvNAME(stash)) );
142 topgv = *gvp;
143 if (SvTYPE(topgv) != SVt_PVGV)
144 gv_init(topgv, stash, name, len, TRUE);
145
748a9306 146 if (cv=GvCV(topgv)) {
147 if (GvCVGEN(topgv) >= sub_generation)
148 return topgv; /* valid cached inheritance */
149 if (!GvCVGEN(topgv)) { /* not an inheritance cache */
16d20bd9 150 return topgv;
748a9306 151 }
152 else {
153 /* stale cached entry, just junk it */
154 GvCV(topgv) = cv = 0;
155 GvCVGEN(topgv) = 0;
156 }
463ee0b2 157 }
748a9306 158 /* if cv is still set, we have to free it if we find something to cache */
79072805 159
160 gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
161 if (gvp && (gv = *gvp) != (GV*)&sv_undef && (av = GvAV(gv))) {
162 SV** svp = AvARRAY(av);
163 I32 items = AvFILL(av) + 1;
164 while (items--) {
79072805 165 SV* sv = *svp++;
a0d0e21e 166 HV* basestash = gv_stashsv(sv, FALSE);
9bbf4081 167 if (!basestash) {
79072805 168 if (dowarn)
a0d0e21e 169 warn("Can't locate package %s for @%s::ISA",
463ee0b2 170 SvPVX(sv), HvNAME(stash));
79072805 171 continue;
172 }
a0d0e21e 173 gv = gv_fetchmeth(basestash, name, len, level + 1);
463ee0b2 174 if (gv) {
748a9306 175 if (cv) { /* junk old undef */
176 assert(SvREFCNT(topgv) > 1);
177 SvREFCNT_dec(topgv);
178 SvREFCNT_dec(cv);
179 }
463ee0b2 180 GvCV(topgv) = GvCV(gv); /* cache the CV */
181 GvCVGEN(topgv) = sub_generation; /* valid for now */
79072805 182 return gv;
463ee0b2 183 }
79072805 184 }
185 }
a0d0e21e 186
187 if (!level) {
188 if (lastchance = gv_stashpv("UNIVERSAL", FALSE)) {
189 if (gv = gv_fetchmeth(lastchance, name, len, level + 1)) {
748a9306 190 if (cv) { /* junk old undef */
191 assert(SvREFCNT(topgv) > 1);
192 SvREFCNT_dec(topgv);
193 SvREFCNT_dec(cv);
194 }
a0d0e21e 195 GvCV(topgv) = GvCV(gv); /* cache the CV */
196 GvCVGEN(topgv) = sub_generation; /* valid for now */
197 return gv;
198 }
199 }
200 }
201
79072805 202 return 0;
203}
204
205GV *
463ee0b2 206gv_fetchmethod(stash, name)
207HV* stash;
208char* name;
209{
210 register char *nend;
a0d0e21e 211 char *nsplit = 0;
212 GV* gv;
463ee0b2 213
214 for (nend = name; *nend; nend++) {
a0d0e21e 215 if (*nend == ':' || *nend == '\'')
216 nsplit = nend;
217 }
218 if (nsplit) {
219 char ch;
220 char *origname = name;
221 name = nsplit + 1;
222 ch = *nsplit;
223 if (*nsplit == ':')
224 --nsplit;
225 *nsplit = '\0';
4633a7c4 226 if (strEQ(origname,"SUPER")) {
227 /* Degenerate case ->SUPER::method should really lookup in original stash */
37120919 228 SV *tmpstr = sv_2mortal(newSVpv(HvNAME(curcop->cop_stash),0));
4633a7c4 229 sv_catpvn(tmpstr, "::SUPER", 7);
230 stash = gv_stashpv(SvPV(tmpstr,na),TRUE);
231 *nsplit = ch;
232 DEBUG_o( deb("Treating %s as %s::%s\n",origname,HvNAME(stash),name) );
233 } else {
234 stash = gv_stashpv(origname,TRUE);
235 *nsplit = ch;
236 }
a0d0e21e 237 }
238 gv = gv_fetchmeth(stash, name, nend - name, 0);
4633a7c4 239
240 if (!gv) {
241 /* Failed obvious case - look for SUPER as last element of stash's name */
242 char *packname = HvNAME(stash);
243 STRLEN len = strlen(packname);
244 if (len >= 7 && strEQ(packname+len-7,"::SUPER")) {
245 /* Now look for @.*::SUPER::ISA */
246 GV** gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
247 if (!gvp || (gv = *gvp) == (GV*)&sv_undef || !GvAV(gv)) {
248 /* No @ISA in package ending in ::SUPER - drop suffix
249 and see if there is an @ISA there
250 */
251 HV *basestash;
252 char ch = packname[len-7];
253 AV *av;
254 packname[len-7] = '\0';
255 basestash = gv_stashpv(packname, TRUE);
256 packname[len-7] = ch;
257 gvp = (GV**)hv_fetch(basestash,"ISA",3,FALSE);
258 if (gvp && (gv = *gvp) != (GV*)&sv_undef && (av = GvAV(gv))) {
259 /* Okay found @ISA after dropping the SUPER, alias it */
260 SV *tmpstr = sv_2mortal(newSVpv(HvNAME(stash),0));
261 sv_catpvn(tmpstr, "::ISA", 5);
262 gv = gv_fetchpv(SvPV(tmpstr,na),TRUE,SVt_PVGV);
263 if (gv) {
264 GvAV(gv) = (AV*)SvREFCNT_inc(av);
265 /* ... and re-try lookup */
266 gv = gv_fetchmeth(stash, name, nend - name, 0);
267 } else {
268 croak("Cannot create %s::ISA",HvNAME(stash));
269 }
270 }
271 }
272 }
273 }
274
a0d0e21e 275 if (!gv) {
276 CV* cv;
277
278 if (strEQ(name,"import") || strEQ(name,"unimport"))
279 gv = &sv_yes;
280 else if (strNE(name, "AUTOLOAD")) {
281 gv = gv_fetchmeth(stash, "AUTOLOAD", 8, 0);
282 if (gv && (cv = GvCV(gv))) { /* One more chance... */
748a9306 283 SV *tmpstr = sv_2mortal(newSVpv(HvNAME(stash),0));
a0d0e21e 284 sv_catpvn(tmpstr,"::", 2);
285 sv_catpvn(tmpstr, name, nend - name);
286 sv_setsv(GvSV(CvGV(cv)), tmpstr);
287 }
463ee0b2 288 }
289 }
a0d0e21e 290 return gv;
291}
292
293HV*
294gv_stashpv(name,create)
295char *name;
296I32 create;
297{
298 char tmpbuf[1234];
299 HV *stash;
300 GV *tmpgv;
301 sprintf(tmpbuf,"%.*s::",1200,name);
302 tmpgv = gv_fetchpv(tmpbuf,create, SVt_PVHV);
303 if (!tmpgv)
304 return 0;
305 if (!GvHV(tmpgv))
306 GvHV(tmpgv) = newHV();
307 stash = GvHV(tmpgv);
308 if (!HvNAME(stash))
309 HvNAME(stash) = savepv(name);
310 return stash;
463ee0b2 311}
312
a0d0e21e 313HV*
314gv_stashsv(sv,create)
315SV *sv;
316I32 create;
317{
318 return gv_stashpv(SvPV(sv,na), create);
319}
320
321
463ee0b2 322GV *
a0d0e21e 323gv_fetchpv(nambeg,add,sv_type)
463ee0b2 324char *nambeg;
79072805 325I32 add;
a0d0e21e 326I32 sv_type;
79072805 327{
463ee0b2 328 register char *name = nambeg;
329 register GV *gv = 0;
79072805 330 GV**gvp;
79072805 331 I32 len;
332 register char *namend;
463ee0b2 333 HV *stash = 0;
79072805 334 bool global = FALSE;
85e6fe83 335 char *tmpbuf;
79072805 336
79072805 337 for (namend = name; *namend; namend++) {
463ee0b2 338 if ((*namend == '\'' && namend[1]) ||
339 (*namend == ':' && namend[1] == ':'))
340 {
463ee0b2 341 if (!stash)
342 stash = defstash;
a0d0e21e 343 if (!SvREFCNT(stash)) /* symbol table under destruction */
344 return Nullgv;
463ee0b2 345
85e6fe83 346 len = namend - name;
347 if (len > 0) {
a0d0e21e 348 New(601, tmpbuf, len+3, char);
349 Copy(name, tmpbuf, len, char);
350 tmpbuf[len++] = ':';
351 tmpbuf[len++] = ':';
352 tmpbuf[len] = '\0';
463ee0b2 353 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
85e6fe83 354 Safefree(tmpbuf);
463ee0b2 355 if (!gvp || *gvp == (GV*)&sv_undef)
356 return Nullgv;
357 gv = *gvp;
85e6fe83 358
463ee0b2 359 if (SvTYPE(gv) == SVt_PVGV)
360 SvMULTI_on(gv);
a0d0e21e 361 else if (!add)
362 return Nullgv;
463ee0b2 363 else
364 gv_init(gv, stash, nambeg, namend - nambeg, (add & 2));
85e6fe83 365
463ee0b2 366 if (!(stash = GvHV(gv)))
367 stash = GvHV(gv) = newHV();
85e6fe83 368
463ee0b2 369 if (!HvNAME(stash))
a0d0e21e 370 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
463ee0b2 371 }
372
373 if (*namend == ':')
374 namend++;
375 namend++;
376 name = namend;
377 if (!*name)
a0d0e21e 378 return gv ? gv : *hv_fetch(defstash, "main::", 6, TRUE);
79072805 379 }
79072805 380 }
a0d0e21e 381 len = namend - name;
382 if (!len)
383 len = 1;
463ee0b2 384
385 /* No stash in name, so see how we can default */
386
387 if (!stash) {
388 if (isIDFIRST(*name)) {
389 if (isUPPER(*name)) {
390 if (*name > 'I') {
391 if (*name == 'S' && (
392 strEQ(name, "SIG") ||
393 strEQ(name, "STDIN") ||
394 strEQ(name, "STDOUT") ||
395 strEQ(name, "STDERR") ))
396 global = TRUE;
397 }
398 else if (*name > 'E') {
399 if (*name == 'I' && strEQ(name, "INC"))
400 global = TRUE;
401 }
402 else if (*name > 'A') {
403 if (*name == 'E' && strEQ(name, "ENV"))
404 global = TRUE;
405 }
406 else if (*name == 'A' && (
407 strEQ(name, "ARGV") ||
408 strEQ(name, "ARGVOUT") ))
409 global = TRUE;
410 }
411 else if (*name == '_' && !name[1])
412 global = TRUE;
413 if (global)
414 stash = defstash;
85e6fe83 415 else if ((COP*)curcop == &compiling) {
a0d0e21e 416 stash = curstash;
748a9306 417 if (add && (hints & HINT_STRICT_VARS) &&
418 sv_type != SVt_PVCV &&
419 sv_type != SVt_PVGV &&
4633a7c4 420 sv_type != SVt_PVFM &&
748a9306 421 sv_type != SVt_PVIO)
422 {
4633a7c4 423 gvp = (GV**)hv_fetch(stash,name,len,0);
424 if (!gvp ||
425 *gvp == (GV*)&sv_undef ||
426 SvTYPE(*gvp) != SVt_PVGV ||
427 !(GvFLAGS(*gvp) & GVf_IMPORTED))
428 stash = 0;
429 else if (sv_type == SVt_PVAV && !GvAV(*gvp) ||
430 sv_type == SVt_PVHV && !GvHV(*gvp) ||
431 sv_type == SVt_PV &&
432 (!GvSV(*gvp) ||
433 (!SvTYPE(GvSV(*gvp)) &&
434 SvREFCNT(GvSV(*gvp)) == 1) ))
435 {
436 warn("Variable \"%c%s\" is not exported",
437 sv_type == SVt_PVAV ? '@' :
438 sv_type == SVt_PVHV ? '%' : '$',
439 name);
440 if (GvCV(*gvp))
441 warn("(Did you mean &%s instead?)\n", name);
a0d0e21e 442 stash = 0;
4633a7c4 443 }
a0d0e21e 444 }
85e6fe83 445 }
463ee0b2 446 else
447 stash = curcop->cop_stash;
448 }
449 else
450 stash = defstash;
451 }
452
453 /* By this point we should have a stash and a name */
454
a0d0e21e 455 if (!stash) {
456 if (add) {
457 warn("Global symbol \"%s\" requires explicit package name", name);
458 ++error_count;
459 stash = curstash ? curstash : defstash; /* avoid core dumps */
460 }
461 else
462 return Nullgv;
463 }
464
465 if (!SvREFCNT(stash)) /* symbol table under destruction */
466 return Nullgv;
467
79072805 468 gvp = (GV**)hv_fetch(stash,name,len,add);
469 if (!gvp || *gvp == (GV*)&sv_undef)
470 return Nullgv;
471 gv = *gvp;
472 if (SvTYPE(gv) == SVt_PVGV) {
a0d0e21e 473 if (add) {
474 SvMULTI_on(gv);
475 gv_init_sv(gv, sv_type);
476 }
79072805 477 return gv;
478 }
93a17b20 479
480 /* Adding a new symbol */
481
a0d0e21e 482 if (add & 4)
483 warn("Had to create %s unexpectedly", nambeg);
463ee0b2 484 gv_init(gv, stash, name, len, add & 2);
a0d0e21e 485 gv_init_sv(gv, sv_type);
93a17b20 486
487 /* set up magic where warranted */
488 switch (*name) {
a0d0e21e 489 case 'A':
490 if (strEQ(name, "ARGV")) {
491 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
492 }
493 break;
494
ed6116ce 495 case 'a':
496 case 'b':
497 if (len == 1)
498 SvMULTI_on(gv);
499 break;
a0d0e21e 500 case 'E':
501 if (strnEQ(name, "EXPORT", 6))
502 SvMULTI_on(gv);
503 break;
463ee0b2 504 case 'I':
505 if (strEQ(name, "ISA")) {
506 AV* av = GvAVn(gv);
8990e307 507 SvMULTI_on(gv);
a0d0e21e 508 sv_magic((SV*)av, (SV*)gv, 'I', Nullch, 0);
509 if (add & 2 && strEQ(nambeg,"AnyDBM_File::ISA") && AvFILL(av) == -1)
85e6fe83 510 {
a0d0e21e 511 char *pname;
512 av_push(av, newSVpv(pname = "NDBM_File",0));
513 gv_stashpv(pname, TRUE);
514 av_push(av, newSVpv(pname = "DB_File",0));
515 gv_stashpv(pname, TRUE);
516 av_push(av, newSVpv(pname = "GDBM_File",0));
517 gv_stashpv(pname, TRUE);
518 av_push(av, newSVpv(pname = "SDBM_File",0));
519 gv_stashpv(pname, TRUE);
520 av_push(av, newSVpv(pname = "ODBM_File",0));
521 gv_stashpv(pname, TRUE);
85e6fe83 522 }
463ee0b2 523 }
524 break;
a0d0e21e 525#ifdef OVERLOAD
526 case 'O':
527 if (strEQ(name, "OVERLOAD")) {
528 HV* hv = GvHVn(gv);
529 SvMULTI_on(gv);
530 sv_magic((SV*)hv, (SV*)gv, 'A', 0, 0);
531 }
532 break;
533#endif /* OVERLOAD */
93a17b20 534 case 'S':
535 if (strEQ(name, "SIG")) {
536 HV *hv;
537 siggv = gv;
538 SvMULTI_on(siggv);
539 hv = GvHVn(siggv);
540 hv_magic(hv, siggv, 'S');
541
542 /* initialize signal stack */
543 signalstack = newAV();
93a17b20 544 AvREAL_off(signalstack);
a0d0e21e 545 av_extend(signalstack, 30);
546 av_fill(signalstack, 0);
93a17b20 547 }
548 break;
549
550 case '&':
463ee0b2 551 if (len > 1)
552 break;
93a17b20 553 ampergv = gv;
554 sawampersand = TRUE;
a0d0e21e 555 goto ro_magicalize;
93a17b20 556
557 case '`':
463ee0b2 558 if (len > 1)
559 break;
93a17b20 560 leftgv = gv;
561 sawampersand = TRUE;
a0d0e21e 562 goto ro_magicalize;
93a17b20 563
564 case '\'':
463ee0b2 565 if (len > 1)
566 break;
93a17b20 567 rightgv = gv;
568 sawampersand = TRUE;
a0d0e21e 569 goto ro_magicalize;
93a17b20 570
571 case ':':
463ee0b2 572 if (len > 1)
573 break;
93a17b20 574 sv_setpv(GvSV(gv),chopset);
575 goto magicalize;
576
93a17b20 577 case '#':
a0d0e21e 578 case '*':
579 if (dowarn && len == 1 && sv_type == SVt_PV)
580 warn("Use of $%s is deprecated", name);
581 /* FALL THROUGH */
582 case '[':
583 case '!':
93a17b20 584 case '?':
585 case '^':
586 case '~':
587 case '=':
588 case '-':
589 case '%':
590 case '.':
93a17b20 591 case '(':
592 case ')':
593 case '<':
594 case '>':
595 case ',':
596 case '\\':
597 case '/':
93a17b20 598 case '|':
748a9306 599 case '\001':
93a17b20 600 case '\004':
748a9306 601 case '\006':
a0d0e21e 602 case '\010':
93a17b20 603 case '\t':
604 case '\020':
605 case '\024':
606 case '\027':
463ee0b2 607 if (len > 1)
608 break;
609 goto magicalize;
610
a0d0e21e 611 case '+':
463ee0b2 612 case '1':
613 case '2':
614 case '3':
615 case '4':
616 case '5':
617 case '6':
618 case '7':
619 case '8':
620 case '9':
a0d0e21e 621 ro_magicalize:
622 SvREADONLY_on(GvSV(gv));
93a17b20 623 magicalize:
463ee0b2 624 sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
93a17b20 625 break;
626
627 case '\014':
463ee0b2 628 if (len > 1)
629 break;
93a17b20 630 sv_setpv(GvSV(gv),"\f");
631 formfeed = GvSV(gv);
632 break;
633 case ';':
463ee0b2 634 if (len > 1)
635 break;
93a17b20 636 sv_setpv(GvSV(gv),"\034");
637 break;
463ee0b2 638 case ']':
639 if (len == 1) {
93a17b20 640 SV *sv;
641 sv = GvSV(gv);
642 sv_upgrade(sv, SVt_PVNV);
a0d0e21e 643 sv_setpv(sv, patchlevel);
93a17b20 644 }
645 break;
79072805 646 }
93a17b20 647 return gv;
79072805 648}
649
650void
651gv_fullname(sv,gv)
652SV *sv;
653GV *gv;
654{
655 HV *hv = GvSTASH(gv);
656
657 if (!hv)
658 return;
659 sv_setpv(sv, sv == (SV*)gv ? "*" : "");
660 sv_catpv(sv,HvNAME(hv));
463ee0b2 661 sv_catpvn(sv,"::", 2);
79072805 662 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
663}
664
665void
666gv_efullname(sv,gv)
667SV *sv;
668GV *gv;
669{
670 GV* egv = GvEGV(gv);
748a9306 671 HV *hv;
672
673 if (!egv)
674 egv = gv;
675 hv = GvSTASH(egv);
79072805 676 if (!hv)
677 return;
748a9306 678
79072805 679 sv_setpv(sv, sv == (SV*)gv ? "*" : "");
680 sv_catpv(sv,HvNAME(hv));
463ee0b2 681 sv_catpvn(sv,"::", 2);
79072805 682 sv_catpvn(sv,GvNAME(egv),GvNAMELEN(egv));
683}
684
685IO *
686newIO()
687{
688 IO *io;
8990e307 689 GV *iogv;
690
691 io = (IO*)NEWSV(0,0);
a0d0e21e 692 sv_upgrade((SV *)io,SVt_PVIO);
8990e307 693 SvREFCNT(io) = 1;
694 SvOBJECT_on(io);
85e6fe83 695 iogv = gv_fetchpv("FileHandle::", TRUE, SVt_PVIO);
8990e307 696 SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
79072805 697 return io;
698}
699
700void
463ee0b2 701gv_check(stash)
702HV* stash;
79072805 703{
704 register HE *entry;
705 register I32 i;
706 register GV *gv;
463ee0b2 707 HV *hv;
a0d0e21e 708 GV *filegv;
463ee0b2 709
8990e307 710 if (!HvARRAY(stash))
711 return;
a0d0e21e 712 for (i = 0; i <= (I32) HvMAX(stash); i++) {
463ee0b2 713 for (entry = HvARRAY(stash)[i]; entry; entry = entry->hent_next) {
a0d0e21e 714 if (entry->hent_key[entry->hent_klen-1] == ':' &&
715 (gv = (GV*)entry->hent_val) && (hv = GvHV(gv)) && HvNAME(hv))
716 {
717 if (hv != defstash)
718 gv_check(hv); /* nested package */
719 }
720 else if (isALPHA(*entry->hent_key)) {
463ee0b2 721 gv = (GV*)entry->hent_val;
722 if (SvMULTI(gv))
723 continue;
724 curcop->cop_line = GvLINE(gv);
a0d0e21e 725 filegv = GvFILEGV(gv);
726 curcop->cop_filegv = filegv;
727 if (filegv && SvMULTI(filegv)) /* Filename began with slash */
8990e307 728 continue;
a0d0e21e 729 warn("Identifier \"%s::%s\" used only once: possible typo",
730 HvNAME(stash), GvNAME(gv));
463ee0b2 731 }
79072805 732 }
733 }
734}
735
736GV *
a0d0e21e 737newGVgen(pack)
738char *pack;
79072805 739{
a0d0e21e 740 (void)sprintf(tokenbuf,"%s::_GEN_%ld",pack,(long)gensym++);
85e6fe83 741 return gv_fetchpv(tokenbuf,TRUE, SVt_PVGV);
79072805 742}
743
744/* hopefully this is only called on local symbol table entries */
745
746GP*
747gp_ref(gp)
748GP* gp;
749{
750 gp->gp_refcnt++;
751 return gp;
752
753}
754
755void
756gp_free(gv)
757GV* gv;
758{
759 IO *io;
760 CV *cv;
761 GP* gp;
762
763 if (!gv || !(gp = GvGP(gv)))
764 return;
765 if (gp->gp_refcnt == 0) {
766 warn("Attempt to free unreferenced glob pointers");
767 return;
768 }
748a9306 769 if (--gp->gp_refcnt > 0) {
770 if (gp->gp_egv == gv)
771 gp->gp_egv = 0;
79072805 772 return;
748a9306 773 }
79072805 774
8990e307 775 SvREFCNT_dec(gp->gp_sv);
776 SvREFCNT_dec(gp->gp_av);
777 SvREFCNT_dec(gp->gp_hv);
778 if ((io = gp->gp_io) && SvTYPE(io) != SVTYPEMASK) {
79072805 779 do_close(gv,FALSE);
8990e307 780 SvREFCNT_dec(io);
79072805 781 }
8990e307 782 if ((cv = gp->gp_cv) && !GvCVGEN(gv))
783 SvREFCNT_dec(cv);
748a9306 784 SvREFCNT_dec(gp->gp_form);
785
79072805 786 Safefree(gp);
787 GvGP(gv) = 0;
788}
789
790#if defined(CRIPPLED_CC) && (defined(iAPX286) || defined(M_I286) || defined(I80286))
791#define MICROPORT
792#endif
793
794#ifdef MICROPORT /* Microport 2.4 hack */
795AV *GvAVn(gv)
796register GV *gv;
797{
798 if (GvGP(gv)->gp_av)
799 return GvGP(gv)->gp_av;
800 else
801 return GvGP(gv_AVadd(gv))->gp_av;
802}
803
804HV *GvHVn(gv)
805register GV *gv;
806{
807 if (GvGP(gv)->gp_hv)
808 return GvGP(gv)->gp_hv;
809 else
810 return GvGP(gv_HVadd(gv))->gp_hv;
811}
812#endif /* Microport 2.4 hack */
a0d0e21e 813
814#ifdef OVERLOAD
815/* Updates and caches the CV's */
816
817bool
818Gv_AMupdate(stash)
819HV* stash;
820{
821 GV** gvp;
822 HV* hv;
823 GV* gv;
824 CV* cv;
825 MAGIC* mg=mg_find((SV*)stash,'c');
748a9306 826 AMT *amtp=mg ? (AMT*)mg->mg_ptr: NULL;
a0d0e21e 827
828 if (mg && (amtp=((AMT*)(mg->mg_ptr)))->was_ok_am == amagic_generation &&
829 amtp->was_ok_sub == sub_generation)
830 return HV_AMAGIC(stash)? TRUE: FALSE;
831 gvp=(GV**)hv_fetch(stash,"OVERLOAD",8,FALSE);
748a9306 832 if (amtp && amtp->table) {
833 int i;
834 for (i=1;i<NofAMmeth*2;i++) {
835 if (amtp->table[i]) {
836 SvREFCNT_dec(amtp->table[i]);
837 }
838 }
839 }
a0d0e21e 840 sv_unmagic((SV*)stash, 'c');
841
842 DEBUG_o( deb("Recalcing overload magic in package %s\n",HvNAME(stash)) );
843
844 if (gvp && ((gv = *gvp) != (GV*)&sv_undef && (hv = GvHV(gv)))) {
845 int filled=0;
846 int i;
847 char *cp;
848 AMT amt;
849 SV* sv;
850 SV** svp;
851
852/* if (*(svp)==(SV*)amagic_generation && *(svp+1)==(SV*)sub_generation) {
853 DEBUG_o( deb("Overload magic in package %s up-to-date\n",HvNAME(stash))
854);
855 return HV_AMAGIC(stash)? TRUE: FALSE;
856 }*/
857
858 amt.was_ok_am=amagic_generation;
859 amt.was_ok_sub=sub_generation;
860 amt.fallback=AMGfallNO;
861
862 /* Work with "fallback" key, which we assume to be first in AMG_names */
863
864 if ((cp=((char**)(*AMG_names))[0]) &&
865 (svp=(SV**)hv_fetch(hv,cp,strlen(cp),FALSE)) && (sv = *svp)) {
866 if (SvTRUE(sv)) amt.fallback=AMGfallYES;
867 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
868 }
869
870 for (i=1;i<NofAMmeth*2;i++) {
871 cv=0;
872
873 if ( (cp=((char**)(*AMG_names))[i]) ) {
874 svp=(SV**)hv_fetch(hv,cp,strlen(cp),FALSE);
875 if (svp && ((sv = *svp) != (GV*)&sv_undef)) {
876 switch (SvTYPE(sv)) {
877 default:
878 if (!SvROK(sv)) {
879 if (!SvOK(sv)) break;
748a9306 880 gv = gv_fetchmethod(stash, SvPV(sv, na));
a0d0e21e 881 if (gv) cv = GvCV(gv);
882 break;
883 }
884 cv = (CV*)SvRV(sv);
885 if (SvTYPE(cv) == SVt_PVCV)
886 break;
887 /* FALL THROUGH */
888 case SVt_PVHV:
889 case SVt_PVAV:
890 die("Not a subroutine reference in %%OVERLOAD");
891 return FALSE;
892 case SVt_PVCV:
893 cv = (CV*)sv;
894 break;
895 case SVt_PVGV:
896 if (!(cv = GvCV((GV*)sv)))
897 cv = sv_2cv(sv, &stash, &gv, TRUE);
898 break;
899 }
900 if (cv) filled=1;
901 else {
748a9306 902 die("Method for operation %s not found in package %.200s during blessing\n",
a0d0e21e 903 cp,HvNAME(stash));
904 return FALSE;
905 }
906 }
907 }
748a9306 908 amt.table[i]=(CV*)SvREFCNT_inc(cv);
a0d0e21e 909 }
910 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(amt));
911 if (filled) {
912/* HV_badAMAGIC_off(stash);*/
913 HV_AMAGIC_on(stash);
914 return TRUE;
915 }
916 }
917/*HV_badAMAGIC_off(stash);*/
918 HV_AMAGIC_off(stash);
919 return FALSE;
920}
921
922/* During call to this subroutine stack can be reallocated. It is
923 * advised to call SPAGAIN macro in your code after call */
924
925SV*
926amagic_call(left,right,method,flags)
927SV* left;
928SV* right;
929int method;
930int flags;
931{
932 MAGIC *mg;
933 CV *cv;
934 CV **cvp=NULL, **ocvp=NULL;
935 AMT *amtp, *oamtp;
936 int fl=0, off, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
748a9306 937 int postpr=0, inc_dec_ass=0, assignshift=assign?1:0;
a0d0e21e 938 HV* stash;
939 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
940 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(left))),'c'))
941 && (ocvp = cvp = ((oamtp=amtp=(AMT*)mg->mg_ptr)->table))
748a9306 942 && ((cv = cvp[off=method+assignshift])
943 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
944 * usual method */
945 (fl = 1, cv = cvp[off=method])))) {
a0d0e21e 946 lr = -1; /* Call method for left argument */
947 } else {
948 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
949 int logic;
950
951 /* look for substituted methods */
952 switch (method) {
953 case inc_amg:
748a9306 954 if (((cv = cvp[off=add_ass_amg]) && (inc_dec_ass=1))
a0d0e21e 955 || ((cv = cvp[off=add_amg]) && (postpr=1))) {
956 right = &sv_yes; lr = -1; assign = 1;
957 }
958 break;
959 case dec_amg:
748a9306 960 if (((cv = cvp[off=subtr_ass_amg]) && (inc_dec_ass=1))
a0d0e21e 961 || ((cv = cvp[off=subtr_amg]) && (postpr=1))) {
962 right = &sv_yes; lr = -1; assign = 1;
963 }
964 break;
965 case bool__amg:
966 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
967 break;
968 case numer_amg:
969 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
970 break;
971 case string_amg:
972 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
973 break;
748a9306 974 case copy_amg:
975 {
976 SV* ref=SvRV(left);
977 if (!SvROK(ref) && SvTYPE(ref) <= SVt_PVMG) { /* Just to be
978 * extra
979 * causious,
980 * maybe in some
981 * additional
982 * cases sv_setsv
983 * is safe too */
984 SV* newref = newSVsv(ref);
985 SvOBJECT_on(newref);
986 SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(ref));
987 return newref;
988 }
989 }
990 break;
a0d0e21e 991 case abs_amg:
748a9306 992 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 993 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
748a9306 994 SV* nullsv=sv_2mortal(newSViv(0));
a0d0e21e 995 if (off1==lt_amg) {
748a9306 996 SV* lessp = amagic_call(left,nullsv,
a0d0e21e 997 lt_amg,AMGf_noright);
998 logic = SvTRUE(lessp);
999 } else {
748a9306 1000 SV* lessp = amagic_call(left,nullsv,
a0d0e21e 1001 ncmp_amg,AMGf_noright);
1002 logic = (SvNV(lessp) < 0);
1003 }
1004 if (logic) {
1005 if (off==subtr_amg) {
1006 right = left;
748a9306 1007 left = nullsv;
a0d0e21e 1008 lr = 1;
1009 }
1010 } else {
1011 return left;
1012 }
1013 }
1014 break;
1015 case neg_amg:
1016 if (cv = cvp[off=subtr_amg]) {
1017 right = left;
1018 left = sv_2mortal(newSViv(0));
1019 lr = 1;
1020 }
1021 break;
1022 default:
1023 goto not_found;
1024 }
1025 if (!cv) goto not_found;
1026 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1027 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(right))),'c'))
1028 && (cvp = ((amtp=(AMT*)mg->mg_ptr)->table))
1029 && (cv = cvp[off=method])) { /* Method for right
1030 * argument found */
1031 lr=1;
748a9306 1032 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
4633a7c4 1033 && (cvp=ocvp) && (lr = -1))
a0d0e21e 1034 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1035 && !(flags & AMGf_unary)) {
1036 /* We look for substitution for
1037 * comparison operations and
1038 * concatendation */
1039 if (method==concat_amg || method==concat_ass_amg
1040 || method==repeat_amg || method==repeat_ass_amg) {
1041 return NULL; /* Delegate operation to string conversion */
1042 }
1043 off = -1;
1044 switch (method) {
1045 case lt_amg:
1046 case le_amg:
1047 case gt_amg:
1048 case ge_amg:
1049 case eq_amg:
1050 case ne_amg:
1051 postpr = 1; off=ncmp_amg; break;
1052 case slt_amg:
1053 case sle_amg:
1054 case sgt_amg:
1055 case sge_amg:
1056 case seq_amg:
1057 case sne_amg:
1058 postpr = 1; off=scmp_amg; break;
1059 }
1060 if (off != -1) cv = cvp[off];
1061 if (!cv) {
1062 goto not_found;
1063 }
1064 } else {
1065 not_found: /* No method found, either report or die */
1066 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1067 notfound = 1; lr = -1;
1068 } else if (cvp && (cv=cvp[nomethod_amg])) {
1069 notfound = 1; lr = 1;
1070 } else {
1071 char tmpstr[512];
748a9306 1072 if (off==-1) off=method;
1073 sprintf(tmpstr,"Operation `%s': no method found,\n\tleft argument %s%.200s,\n\tright argument %s%.200s",
a0d0e21e 1074 ((char**)AMG_names)[off],
1075 SvAMAGIC(left)?
1076 "in overloaded package ":
1077 "has no overloaded magic",
1078 SvAMAGIC(left)?
1079 HvNAME(SvSTASH(SvRV(left))):
1080 "",
1081 SvAMAGIC(right)?
1082 "in overloaded package ":
1083 "has no overloaded magic",
1084 SvAMAGIC(right)?
1085 HvNAME(SvSTASH(SvRV(right))):
1086 "");
1087 if (amtp && amtp->fallback >= AMGfallYES) {
1088 DEBUG_o( deb(tmpstr) );
1089 } else {
1090 die(tmpstr);
1091 }
1092 return NULL;
1093 }
1094 }
1095 }
1096 if (!notfound) {
748a9306 1097 DEBUG_o( deb("Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %.200s%s\n",
a0d0e21e 1098 ((char**)AMG_names)[off],
748a9306 1099 method+assignshift==off? "" :
1100 " (initially `",
1101 method+assignshift==off? "" :
1102 ((char**)AMG_names)[method+assignshift],
1103 method+assignshift==off? "" : "')",
1104 flags & AMGf_unary? "" :
1105 lr==1 ? " for right argument": " for left argument",
1106 flags & AMGf_unary? " for argument" : "",
a0d0e21e 1107 HvNAME(stash),
1108 fl? ",\n\tassignment variant used": "") );
748a9306 1109 /* Since we use shallow copy during assignment, we need
1110 * to dublicate the contents, probably calling user-supplied
1111 * version of copy operator
1112 */
1113 if ((method+assignshift==off
1114 && (assign || method==inc_amg || method==dec_amg))
1115 || inc_dec_ass) RvDEEPCP(left);
a0d0e21e 1116 }
1117 {
1118 dSP;
1119 BINOP myop;
1120 SV* res;
1121
1122 Zero(&myop, 1, BINOP);
1123 myop.op_last = (OP *) &myop;
1124 myop.op_next = Nullop;
1125 myop.op_flags = OPf_KNOW|OPf_STACKED;
1126
1127 ENTER;
1128 SAVESPTR(op);
1129 op = (OP *) &myop;
1130 PUTBACK;
1131 pp_pushmark();
1132
1133 EXTEND(sp, notfound + 5);
1134 PUSHs(lr>0? right: left);
1135 PUSHs(lr>0? left: right);
1136 PUSHs( assign ? &sv_undef : (lr>0? &sv_yes: &sv_no));
1137 if (notfound) {
1138 PUSHs( sv_2mortal(newSVpv(((char**)AMG_names)[off],0)) );
1139 }
1140 PUSHs((SV*)cv);
1141 PUTBACK;
1142
1143 if (op = pp_entersub())
1144 run();
1145 LEAVE;
1146 SPAGAIN;
1147
1148 res=POPs;
1149 PUTBACK;
1150
1151 if (notfound) {
1152 /* sv_2mortal(res); */
1153 return NULL;
1154 }
1155
1156 if (postpr) {
1157 int ans;
1158 switch (method) {
1159 case le_amg:
1160 case sle_amg:
1161 ans=SvIV(res)<=0; break;
1162 case lt_amg:
1163 case slt_amg:
1164 ans=SvIV(res)<0; break;
1165 case ge_amg:
1166 case sge_amg:
1167 ans=SvIV(res)>=0; break;
1168 case gt_amg:
1169 case sgt_amg:
1170 ans=SvIV(res)>0; break;
1171 case eq_amg:
1172 case seq_amg:
1173 ans=SvIV(res)==0; break;
1174 case ne_amg:
1175 case sne_amg:
1176 ans=SvIV(res)!=0; break;
1177 case inc_amg:
1178 case dec_amg:
1179 SvSetSV(left,res); return res; break;
1180 }
1181 return ans? &sv_yes: &sv_no;
748a9306 1182 } else if (method==copy_amg) {
1183 if (!SvROK(res)) {
1184 die("Copy method did not return a reference");
1185 }
1186 return SvREFCNT_inc(SvRV(res));
a0d0e21e 1187 } else {
1188 return res;
1189 }
1190 }
1191}
1192#endif /* OVERLOAD */
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