This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
https://perl5.git.perl.org / perl5.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Some Chip patches (some tweaked to match _5x source):
[perl5.git] / op.c
CommitLineData
a0d0e21e 1/* op.c
79072805 2 *
9607fc9c 3 * Copyright (c) 1991-1997, Larry Wall
79072805
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 *
a0d0e21e
LW		 8 */
9
10/*
11 * "You see: Mr. Drogo, he married poor Miss Primula Brandybuck. She was
12 * our Mr. Bilbo's first cousin on the mother's side (her mother being the
13 * youngest of the Old Took's daughters); and Mr. Drogo was his second
14 * cousin. So Mr. Frodo is his first *and* second cousin, once removed
15 * either way, as the saying is, if you follow me." --the Gaffer
79072805
LW		 16 */
17
18#include "EXTERN.h"
19#include "perl.h"
20
e50aee73 21/*
5dc0d613 22 * In the following definition, the ", Nullop" is just to make the compiler
a5f75d66 23 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 24 */
11343788 25#define CHECKOP(type,o) \
28757baa 26 ((op_mask && op_mask[type]) \
5dc0d613 27 ? ( op_free((OP*)o), \
28757baa 28 croak("%s trapped by operation mask", op_desc[type]), \
29 Nullop ) \
11343788 30 : (*check[type])((OP*)o))
e50aee73 31
11343788 32static I32 list_assignment _((OP *o));
3bc5dc61 33static void bad_type _((I32 n, char *t, char *name, OP *kid));
11343788
MB		 34static OP *modkids _((OP *o, I32 type));
35static OP *no_fh_allowed _((OP *o));
5dc0d613 36static bool scalar_mod_type _((OP *o, I32 type));
11343788
MB		 37static OP *scalarboolean _((OP *o));
38static OP *too_few_arguments _((OP *o, char* name));
39static OP *too_many_arguments _((OP *o, char* name));
40static void null _((OP* o));
bbce6d69 41static PADOFFSET pad_findlex _((char* name, PADOFFSET newoff, U32 seq,
748a9306 42 CV* startcv, I32 cx_ix));
54b9620d 43static OP *newDEFSVOP _((void));
79072805 44
4633a7c4 45static char*
8ac85365 46gv_ename(GV *gv)
4633a7c4
LW		 47{
48 SV* tmpsv = sv_newmortal();
46fc3d4c 49 gv_efullname3(tmpsv, gv, Nullch);
4633a7c4
LW		 50 return SvPV(tmpsv,na);
51}
52
8990e307 53static OP *
8ac85365 54no_fh_allowed(OP *o)
79072805 55{
46fc3d4c 56 yyerror(form("Missing comma after first argument to %s function",
5196be3e 57 op_desc[o->op_type]));
11343788 58 return o;
79072805
LW		 59}
60
8990e307 61static OP *
8ac85365 62too_few_arguments(OP *o, char *name)
79072805 63{
46fc3d4c 64 yyerror(form("Not enough arguments for %s", name));
11343788 65 return o;
79072805
LW		 66}
67
8990e307 68static OP *
8ac85365 69too_many_arguments(OP *o, char *name)
79072805 70{
46fc3d4c 71 yyerror(form("Too many arguments for %s", name));
11343788 72 return o;
79072805
LW		 73}
74
3bc5dc61 75static void
8ac85365 76bad_type(I32 n, char *t, char *name, OP *kid)
8990e307 77{
46fc3d4c 78 yyerror(form("Type of arg %d to %s must be %s (not %s)",
79 (int)n, name, t, op_desc[kid->op_type]));
8990e307
LW		 80}
81
a0d0e21e 82void
8ac85365 83assertref(OP *o)
a0d0e21e 84{
11343788 85 int type = o->op_type;
a0d0e21e 86 if (type != OP_AELEM && type != OP_HELEM) {
46fc3d4c 87 yyerror(form("Can't use subscript on %s", op_desc[type]));
8ebc5c01 88 if (type == OP_ENTERSUB || type == OP_RV2HV || type == OP_PADHV)
748a9306 89 warn("(Did you mean $ or @ instead of %c?)\n",
8ebc5c01 90 type == OP_ENTERSUB ? '&' : '%');
a0d0e21e
LW		 91 }
92}
93
79072805
LW		 94/* "register" allocation */
95
96PADOFFSET
8ac85365 97pad_allocmy(char *name)
93a17b20 98{
11343788 99 dTHR;
a0d0e21e
LW		 100 PADOFFSET off;
101 SV *sv;
102
103 if (!(isALPHA(name[1]) || name[1] == '_' && (int)strlen(name) > 2)) {
46fc3d4c 104 if (!isPRINT(name[1])) {
105 name[3] = '\0';
106 name[2] = toCTRL(name[1]);
107 name[1] = '^';
108 }
a0d0e21e
LW		 109 croak("Can't use global %s in \"my\"",name);
110 }
93965878 111 if (dowarn && AvFILLp(comppad_name) >= 0) {
b1cb66bf 112 SV **svp = AvARRAY(comppad_name);
93965878 113 for (off = AvFILLp(comppad_name); off > comppad_name_floor; off--) {
b1cb66bf 114 if ((sv = svp[off])
115 && sv != &sv_undef
116 && SvIVX(sv) == 999999999 /* var is in open scope */
117 && strEQ(name, SvPVX(sv)))
118 {
119 warn("\"my\" variable %s masks earlier declaration in same scope", name);
120 break;
121 }
122 }
123 }
a0d0e21e
LW		 124 off = pad_alloc(OP_PADSV, SVs_PADMY);
125 sv = NEWSV(1102,0);
93a17b20
LW		 126 sv_upgrade(sv, SVt_PVNV);
127 sv_setpv(sv, name);
c750a3ec
MB		 128 if (in_my_stash) {
129 if (*name != '$')
130 croak("Can't declare class for non-scalar %s in \"my\"",name);
131 SvOBJECT_on(sv);
132 (void)SvUPGRADE(sv, SVt_PVMG);
133 SvSTASH(sv) = (HV*)SvREFCNT_inc(in_my_stash);
134 sv_objcount++;
135 }
8990e307 136 av_store(comppad_name, off, sv);
748a9306 137 SvNVX(sv) = (double)999999999;
8990e307
LW		 138 SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
139 if (!min_intro_pending)
140 min_intro_pending = off;
141 max_intro_pending = off;
93a17b20 142 if (*name == '@')
463ee0b2 143 av_store(comppad, off, (SV*)newAV());
93a17b20 144 else if (*name == '%')
463ee0b2 145 av_store(comppad, off, (SV*)newHV());
ed6116ce 146 SvPADMY_on(curpad[off]);
93a17b20
LW		 147 return off;
148}
149
748a9306 150static PADOFFSET
e9a444f0 151#ifndef CAN_PROTOTYPE
748a9306 152pad_findlex(name, newoff, seq, startcv, cx_ix)
93a17b20 153char *name;
748a9306 154PADOFFSET newoff;
bbce6d69 155U32 seq;
748a9306
LW		 156CV* startcv;
157I32 cx_ix;
e9a444f0 158#else
bbce6d69 159pad_findlex(char *name, PADOFFSET newoff, U32 seq, CV* startcv, I32 cx_ix)
e9a444f0 160#endif
93a17b20 161{
11343788 162 dTHR;
748a9306 163 CV *cv;
93a17b20
LW		 164 I32 off;
165 SV *sv;
93a17b20 166 register I32 i;
c09156bb 167 register PERL_CONTEXT *cx;
a0d0e21e 168 int saweval;
93a17b20 169
748a9306 170 for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
4fdae800 171 AV *curlist = CvPADLIST(cv);
172 SV **svp = av_fetch(curlist, 0, FALSE);
748a9306 173 AV *curname;
4fdae800 174
748a9306 175 if (!svp || *svp == &sv_undef)
4633a7c4 176 continue;
748a9306
LW		 177 curname = (AV*)*svp;
178 svp = AvARRAY(curname);
93965878 179 for (off = AvFILLp(curname); off > 0; off--) {
748a9306
LW		 180 if ((sv = svp[off]) &&
181 sv != &sv_undef &&
182 seq <= SvIVX(sv) &&
13826f2c 183 seq > I_32(SvNVX(sv)) &&
748a9306
LW		 184 strEQ(SvPVX(sv), name))
185 {
5f05dabc 186 I32 depth;
187 AV *oldpad;
188 SV *oldsv;
189
190 depth = CvDEPTH(cv);
191 if (!depth) {
9607fc9c 192 if (newoff) {
193 if (SvFAKE(sv))
194 continue;
4fdae800 195 return 0; /* don't clone from inactive stack frame */
9607fc9c 196 }
5f05dabc 197 depth = 1;
198 }
199 oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
200 oldsv = *av_fetch(oldpad, off, TRUE);
748a9306 201 if (!newoff) { /* Not a mere clone operation. */
9607fc9c 202 SV *namesv = NEWSV(1103,0);
748a9306 203 newoff = pad_alloc(OP_PADSV, SVs_PADMY);
9607fc9c 204 sv_upgrade(namesv, SVt_PVNV);
205 sv_setpv(namesv, name);
206 av_store(comppad_name, newoff, namesv);
207 SvNVX(namesv) = (double)curcop->cop_seq;
208 SvIVX(namesv) = 999999999; /* A ref, intro immediately */
209 SvFAKE_on(namesv); /* A ref, not a real var */
774d564b 210 if (CvANON(compcv) || SvTYPE(compcv) == SVt_PVFM) {
28757baa 211 /* "It's closures all the way down." */
212 CvCLONE_on(compcv);
54310121 213 if (cv == startcv) {
214 if (CvANON(compcv))
215 oldsv = Nullsv; /* no need to keep ref */
216 }
217 else {
28757baa 218 CV *bcv;
219 for (bcv = startcv;
220 bcv && bcv != cv && !CvCLONE(bcv);
221 bcv = CvOUTSIDE(bcv)) {
222 if (CvANON(bcv))
223 CvCLONE_on(bcv);
224 else {
774d564b 225 if (dowarn && !CvUNIQUE(cv))
44a8e56a 226 warn(
227 "Variable \"%s\" may be unavailable",
28757baa 228 name);
229 break;
230 }
231 }
232 }
233 }
44a8e56a 234 else if (!CvUNIQUE(compcv)) {
9607fc9c 235 if (dowarn && !SvFAKE(sv) && !CvUNIQUE(cv))
44a8e56a 236 warn("Variable \"%s\" will not stay shared", name);
5f05dabc 237 }
748a9306 238 }
199100c8 239 av_store(comppad, newoff, SvREFCNT_inc(oldsv));
748a9306
LW		 240 return newoff;
241 }
93a17b20
LW		 242 }
243 }
244
245 /* Nothing in current lexical context--try eval's context, if any.
246 * This is necessary to let the perldb get at lexically scoped variables.
247 * XXX This will also probably interact badly with eval tree caching.
248 */
249
a0d0e21e 250 saweval = 0;
748a9306 251 for (i = cx_ix; i >= 0; i--) {
93a17b20
LW		 252 cx = &cxstack[i];
253 switch (cx->cx_type) {
254 default:
748a9306
LW		 255 if (i == 0 && saweval) {
256 seq = cxstack[saweval].blk_oldcop->cop_seq;
257 return pad_findlex(name, newoff, seq, main_cv, 0);
258 }
93a17b20
LW		 259 break;
260 case CXt_EVAL:
44a8e56a 261 switch (cx->blk_eval.old_op_type) {
262 case OP_ENTEREVAL:
263 saweval = i;
264 break;
265 case OP_REQUIRE:
266 /* require must have its own scope */
267 return 0;
268 }
93a17b20
LW		 269 break;
270 case CXt_SUB:
271 if (!saweval)
272 return 0;
273 cv = cx->blk_sub.cv;
748a9306
LW		 274 if (debstash && CvSTASH(cv) == debstash) { /* ignore DB'* scope */
275 saweval = i; /* so we know where we were called from */
93a17b20 276 continue;
93a17b20 277 }
748a9306
LW		 278 seq = cxstack[saweval].blk_oldcop->cop_seq;
279 return pad_findlex(name, newoff, seq, cv, i-1);
93a17b20
LW		 280 }
281 }
282
748a9306
LW		 283 return 0;
284}
a0d0e21e 285
748a9306 286PADOFFSET
8ac85365 287pad_findmy(char *name)
748a9306 288{
11343788 289 dTHR;
748a9306 290 I32 off;
54310121 291 I32 pendoff = 0;
748a9306
LW		 292 SV *sv;
293 SV **svp = AvARRAY(comppad_name);
bbce6d69 294 U32 seq = cop_seqmax;
748a9306 295
11343788
MB		 296#ifdef USE_THREADS
297 /*
298 * Special case to get lexical (and hence per-thread) @_.
299 * XXX I need to find out how to tell at parse-time whether use
300 * of @_ should refer to a lexical (from a sub) or defgv (global
301 * scope and maybe weird sub-ish things like formats). See
302 * startsub in perly.y. It's possible that @_ could be lexical
303 * (at least from subs) even in non-threaded perl.
304 */
305 if (strEQ(name, "@_"))
306 return 0; /* success. (NOT_IN_PAD indicates failure) */
307#endif /* USE_THREADS */
308
748a9306 309 /* The one we're looking for is probably just before comppad_name_fill. */
93965878 310 for (off = AvFILLp(comppad_name); off > 0; off--) {
a0d0e21e
LW		 311 if ((sv = svp[off]) &&
312 sv != &sv_undef &&
54310121 313 (!SvIVX(sv) ||
314 (seq <= SvIVX(sv) &&
315 seq > I_32(SvNVX(sv)))) &&
a0d0e21e
LW		 316 strEQ(SvPVX(sv), name))
317 {
54310121 318 if (SvIVX(sv))
319 return (PADOFFSET)off;
320 pendoff = off; /* this pending def. will override import */
a0d0e21e
LW		 321 }
322 }
748a9306
LW		 323
324 /* See if it's in a nested scope */
325 off = pad_findlex(name, 0, seq, CvOUTSIDE(compcv), cxstack_ix);
54310121 326 if (off) {
327 /* If there is a pending local definition, this new alias must die */
328 if (pendoff)
329 SvIVX(AvARRAY(comppad_name)[off]) = seq;
11343788 330 return off; /* pad_findlex returns 0 for failure...*/
54310121 331 }
11343788 332 return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */
93a17b20
LW		 333}
334
335void
8ac85365 336pad_leavemy(I32 fill)
93a17b20
LW		 337{
338 I32 off;
8990e307 339 SV **svp = AvARRAY(comppad_name);
93a17b20 340 SV *sv;
8990e307
LW		 341 if (min_intro_pending && fill < min_intro_pending) {
342 for (off = max_intro_pending; off >= min_intro_pending; off--) {
a0d0e21e 343 if ((sv = svp[off]) && sv != &sv_undef)
8990e307
LW		 344 warn("%s never introduced", SvPVX(sv));
345 }
346 }
347 /* "Deintroduce" my variables that are leaving with this scope. */
93965878 348 for (off = AvFILLp(comppad_name); off > fill; off--) {
748a9306 349 if ((sv = svp[off]) && sv != &sv_undef && SvIVX(sv) == 999999999)
463ee0b2 350 SvIVX(sv) = cop_seqmax;
93a17b20
LW		 351 }
352}
353
354PADOFFSET
8ac85365 355pad_alloc(I32 optype, U32 tmptype)
79072805 356{
11343788 357 dTHR;
79072805
LW		 358 SV *sv;
359 I32 retval;
360
361 if (AvARRAY(comppad) != curpad)
463ee0b2 362 croak("panic: pad_alloc");
a0d0e21e
LW		 363 if (pad_reset_pending)
364 pad_reset();
ed6116ce 365 if (tmptype & SVs_PADMY) {
79072805 366 do {
93965878 367 sv = *av_fetch(comppad, AvFILLp(comppad) + 1, TRUE);
ed6116ce 368 } while (SvPADBUSY(sv)); /* need a fresh one */
93965878 369 retval = AvFILLp(comppad);
79072805
LW		 370 }
371 else {
bbce6d69 372 SV **names = AvARRAY(comppad_name);
93965878 373 SSize_t names_fill = AvFILLp(comppad_name);
bbce6d69 374 for (;;) {
375 /*
376 * "foreach" index vars temporarily become aliases to non-"my"
377 * values. Thus we must skip, not just pad values that are
378 * marked as current pad values, but also those with names.
379 */
380 if (++padix <= names_fill &&
381 (sv = names[padix]) && sv != &sv_undef)
382 continue;
383 sv = *av_fetch(comppad, padix, TRUE);
384 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
385 break;
386 }
79072805
LW		 387 retval = padix;
388 }
8990e307 389 SvFLAGS(sv) |= tmptype;
79072805 390 curpad = AvARRAY(comppad);
11343788 391#ifdef USE_THREADS
5dc0d613
MB		 392 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
393 (unsigned long) thr, (unsigned long) curpad,
394 (long) retval, op_name[optype]));
11343788 395#else
5dc0d613
MB		 396 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad alloc %ld for %s\n",
397 (long) retval, op_name[optype]));
11343788 398#endif /* USE_THREADS */
79072805
LW		 399 return (PADOFFSET)retval;
400}
401
402SV *
a0d0e21e 403#ifndef CAN_PROTOTYPE
79072805
LW		 404pad_sv(po)
405PADOFFSET po;
8990e307
LW		 406#else
407pad_sv(PADOFFSET po)
a0d0e21e 408#endif /* CAN_PROTOTYPE */
79072805 409{
11343788
MB		 410 dTHR;
411#ifdef USE_THREADS
5dc0d613
MB		 412 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
413 (unsigned long) thr, (unsigned long) curpad, po));
11343788 414#else
79072805 415 if (!po)
463ee0b2 416 croak("panic: pad_sv po");
5dc0d613 417 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad sv %d\n", po));
11343788 418#endif /* USE_THREADS */
79072805
LW		 419 return curpad[po]; /* eventually we'll turn this into a macro */
420}
421
422void
a0d0e21e 423#ifndef CAN_PROTOTYPE
79072805
LW		 424pad_free(po)
425PADOFFSET po;
8990e307
LW		 426#else
427pad_free(PADOFFSET po)
a0d0e21e 428#endif /* CAN_PROTOTYPE */
79072805 429{
11343788 430 dTHR;
a0d0e21e
LW		 431 if (!curpad)
432 return;
79072805 433 if (AvARRAY(comppad) != curpad)
463ee0b2 434 croak("panic: pad_free curpad");
79072805 435 if (!po)
463ee0b2 436 croak("panic: pad_free po");
11343788 437#ifdef USE_THREADS
5dc0d613
MB		 438 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
439 (unsigned long) thr, (unsigned long) curpad, po));
11343788 440#else
5dc0d613 441 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad free %d\n", po));
11343788 442#endif /* USE_THREADS */
a0d0e21e 443 if (curpad[po] && curpad[po] != &sv_undef)
ed6116ce 444 SvPADTMP_off(curpad[po]);
a0d0e21e 445 if ((I32)po < padix)
79072805
LW		 446 padix = po - 1;
447}
448
449void
a0d0e21e 450#ifndef CAN_PROTOTYPE
79072805
LW		 451pad_swipe(po)
452PADOFFSET po;
8990e307
LW		 453#else
454pad_swipe(PADOFFSET po)
a0d0e21e 455#endif /* CAN_PROTOTYPE */
79072805 456{
11343788 457 dTHR;
79072805 458 if (AvARRAY(comppad) != curpad)
463ee0b2 459 croak("panic: pad_swipe curpad");
79072805 460 if (!po)
463ee0b2 461 croak("panic: pad_swipe po");
11343788 462#ifdef USE_THREADS
5dc0d613
MB		 463 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
464 (unsigned long) thr, (unsigned long) curpad, po));
11343788 465#else
5dc0d613 466 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad swipe %d\n", po));
11343788 467#endif /* USE_THREADS */
ed6116ce 468 SvPADTMP_off(curpad[po]);
a0d0e21e
LW		 469 curpad[po] = NEWSV(1107,0);
470 SvPADTMP_on(curpad[po]);
471 if ((I32)po < padix)
79072805
LW		 472 padix = po - 1;
473}
474
475void
8ac85365 476pad_reset(void)
79072805 477{
11343788 478 dTHR;
79072805
LW		 479 register I32 po;
480
481 if (AvARRAY(comppad) != curpad)
463ee0b2 482 croak("panic: pad_reset curpad");
11343788 483#ifdef USE_THREADS
5dc0d613
MB		 484 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
485 (unsigned long) thr, (unsigned long) curpad));
11343788 486#else
760ac839 487 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad reset\n"));
11343788 488#endif /* USE_THREADS */
748a9306
LW		 489 if (!tainting) { /* Can't mix tainted and non-tainted temporaries. */
490 for (po = AvMAX(comppad); po > padix_floor; po--) {
ff0cee69 491 if (curpad[po] && !SvIMMORTAL(curpad[po]))
748a9306
LW		 492 SvPADTMP_off(curpad[po]);
493 }
494 padix = padix_floor;
79072805 495 }
a0d0e21e 496 pad_reset_pending = FALSE;
79072805
LW		 497}
498
a863c7d1 499#ifdef USE_THREADS
54b9620d 500/* find_threadsv is not reentrant */
a863c7d1 501PADOFFSET
54b9620d 502find_threadsv(char *name)
a863c7d1
MB		 503{
504 dTHR;
505 char *p;
506 PADOFFSET key;
554b3eca 507 SV **svp;
54b9620d
MB		 508 /* We currently only handle names of a single character */
509 p = strchr(threadsv_names, *name);
a863c7d1
MB		 510 if (!p)
511 return NOT_IN_PAD;
54b9620d
MB		 512 key = p - threadsv_names;
513 svp = av_fetch(thr->threadsv, key, FALSE);
554b3eca
MB		 514 if (!svp) {
515 SV *sv = NEWSV(0, 0);
54b9620d 516 av_store(thr->threadsv, key, sv);
940cb80d 517 thr->threadsvp = AvARRAY(thr->threadsv);
554b3eca
MB		 518 /*
519 * Some magic variables used to be automagically initialised
520 * in gv_fetchpv. Those which are now per-thread magicals get
521 * initialised here instead.
522 */
523 switch (*name) {
54b9620d
MB		 524 case '_':
525 break;
554b3eca
MB		 526 case ';':
527 sv_setpv(sv, "\034");
54b9620d 528 sv_magic(sv, 0, 0, name, 1);
554b3eca 529 break;
c277df42
IZ		 530 case '&':
531 case '`':
532 case '\'':
533 sawampersand = TRUE;
534 SvREADONLY_on(sv);
d8b5173a 535 /* FALL THROUGH */
54b9620d
MB		 536 default:
537 sv_magic(sv, 0, 0, name, 1);
554b3eca 538 }
a863c7d1 539 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
54b9620d 540 "find_threadsv: new SV %p for $%s%c\n",
554b3eca
MB		 541 sv, (*name < 32) ? "^" : "",
542 (*name < 32) ? toCTRL(*name) : *name));
a863c7d1
MB		 543 }
544 return key;
545}
546#endif /* USE_THREADS */
547
79072805
LW		 548/* Destructor */
549
550void
8ac85365 551op_free(OP *o)
79072805 552{
85e6fe83 553 register OP *kid, *nextkid;
79072805 554
5dc0d613 555 if (!o || o->op_seq == (U16)-1)
79072805
LW		 556 return;
557
11343788
MB		 558 if (o->op_flags & OPf_KIDS) {
559 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 560 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 561 op_free(kid);
85e6fe83 562 }
79072805
LW		 563 }
564
11343788 565 switch (o->op_type) {
8990e307 566 case OP_NULL:
11343788 567 o->op_targ = 0; /* Was holding old type, if any. */
8990e307 568 break;
a0d0e21e 569 case OP_ENTEREVAL:
11343788 570 o->op_targ = 0; /* Was holding hints. */
a0d0e21e 571 break;
554b3eca 572#ifdef USE_THREADS
2faa37cc 573 case OP_THREADSV:
54b9620d 574 o->op_targ = 0; /* Was holding index into thr->threadsv AV. */
554b3eca
MB		 575 break;
576#endif /* USE_THREADS */
a6006777 577 default:
5196be3e 578 if (!(o->op_flags & OPf_REF) || (check[o->op_type] != ck_ftst))
a6006777 579 break;
580 /* FALL THROUGH */
463ee0b2 581 case OP_GVSV:
79072805 582 case OP_GV:
a6006777 583 case OP_AELEMFAST:
11343788 584 SvREFCNT_dec(cGVOPo->op_gv);
8990e307
LW		 585 break;
586 case OP_NEXTSTATE:
587 case OP_DBSTATE:
5196be3e 588 Safefree(cCOPo->cop_label);
11343788 589 SvREFCNT_dec(cCOPo->cop_filegv);
79072805
LW		 590 break;
591 case OP_CONST:
11343788 592 SvREFCNT_dec(cSVOPo->op_sv);
79072805 593 break;
748a9306
LW		 594 case OP_GOTO:
595 case OP_NEXT:
596 case OP_LAST:
597 case OP_REDO:
11343788 598 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 599 break;
600 /* FALL THROUGH */
a0d0e21e 601 case OP_TRANS:
11343788 602 Safefree(cPVOPo->op_pv);
a0d0e21e
LW		 603 break;
604 case OP_SUBST:
11343788 605 op_free(cPMOPo->op_pmreplroot);
a0d0e21e 606 /* FALL THROUGH */
748a9306 607 case OP_PUSHRE:
a0d0e21e 608 case OP_MATCH:
c277df42 609 ReREFCNT_dec(cPMOPo->op_pmregexp);
a0d0e21e 610 break;
79072805
LW		 611 }
612
11343788
MB		 613 if (o->op_targ > 0)
614 pad_free(o->op_targ);
8990e307 615
11343788 616 Safefree(o);
79072805
LW		 617}
618
8990e307 619static void
8ac85365 620null(OP *o)
8990e307 621{
54b9620d 622 if (o->op_type != OP_NULL && o->op_type != OP_THREADSV && o->op_targ > 0)
11343788
MB		 623 pad_free(o->op_targ);
624 o->op_targ = o->op_type;
625 o->op_type = OP_NULL;
626 o->op_ppaddr = ppaddr[OP_NULL];
8990e307
LW		 627}
628
79072805
LW		 629/* Contextualizers */
630
463ee0b2 631#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 632
633OP *
8ac85365 634linklist(OP *o)
79072805
LW		 635{
636 register OP *kid;
637
11343788
MB		 638 if (o->op_next)
639 return o->op_next;
79072805
LW		 640
641 /* establish postfix order */
11343788
MB		 642 if (cUNOPo->op_first) {
643 o->op_next = LINKLIST(cUNOPo->op_first);
644 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 645 if (kid->op_sibling)
646 kid->op_next = LINKLIST(kid->op_sibling);
647 else
11343788 648 kid->op_next = o;
79072805
LW		 649 }
650 }
651 else
11343788 652 o->op_next = o;
79072805 653
11343788 654 return o->op_next;
79072805
LW		 655}
656
657OP *
8ac85365 658scalarkids(OP *o)
79072805
LW		 659{
660 OP *kid;
11343788
MB		 661 if (o && o->op_flags & OPf_KIDS) {
662 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 663 scalar(kid);
664 }
11343788 665 return o;
79072805
LW		 666}
667
a0d0e21e 668static OP *
8ac85365 669scalarboolean(OP *o)
8990e307
LW		 670{
671 if (dowarn &&
11343788 672 o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
0f15f207 673 dTHR;
a0d0e21e
LW		 674 line_t oldline = curcop->cop_line;
675
676 if (copline != NOLINE)
677 curcop->cop_line = copline;
678 warn("Found = in conditional, should be ==");
679 curcop->cop_line = oldline;
680 }
11343788 681 return scalar(o);
8990e307
LW		 682}
683
684OP *
8ac85365 685scalar(OP *o)
79072805
LW		 686{
687 OP *kid;
688
a0d0e21e 689 /* assumes no premature commitment */
5dc0d613
MB		 690 if (!o || (o->op_flags & OPf_WANT) || error_count
691 || o->op_type == OP_RETURN)
11343788 692 return o;
79072805 693
5dc0d613 694 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 695
11343788 696 switch (o->op_type) {
79072805 697 case OP_REPEAT:
11343788
MB		 698 if (o->op_private & OPpREPEAT_DOLIST)
699 null(((LISTOP*)cBINOPo->op_first)->op_first);
700 scalar(cBINOPo->op_first);
8990e307 701 break;
79072805
LW		 702 case OP_OR:
703 case OP_AND:
704 case OP_COND_EXPR:
11343788 705 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 706 scalar(kid);
79072805 707 break;
a0d0e21e 708 case OP_SPLIT:
11343788 709 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 710 if (!kPMOP->op_pmreplroot)
711 deprecate("implicit split to @_");
712 }
713 /* FALL THROUGH */
79072805
LW		 714 case OP_MATCH:
715 case OP_SUBST:
716 case OP_NULL:
8990e307 717 default:
11343788
MB		 718 if (o->op_flags & OPf_KIDS) {
719 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 720 scalar(kid);
721 }
79072805
LW		 722 break;
723 case OP_LEAVE:
724 case OP_LEAVETRY:
5dc0d613 725 kid = cLISTOPo->op_first;
54310121 726 scalar(kid);
727 while (kid = kid->op_sibling) {
728 if (kid->op_sibling)
729 scalarvoid(kid);
730 else
731 scalar(kid);
732 }
0f15f207 733 WITH_THR(curcop = &compiling);
54310121 734 break;
748a9306 735 case OP_SCOPE:
79072805 736 case OP_LINESEQ:
8990e307 737 case OP_LIST:
11343788 738 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 739 if (kid->op_sibling)
740 scalarvoid(kid);
741 else
742 scalar(kid);
743 }
0f15f207 744 WITH_THR(curcop = &compiling);
79072805
LW		 745 break;
746 }
11343788 747 return o;
79072805
LW		 748}
749
750OP *
8ac85365 751scalarvoid(OP *o)
79072805
LW		 752{
753 OP *kid;
8990e307
LW		 754 char* useless = 0;
755 SV* sv;
79072805 756
54310121 757 /* assumes no premature commitment */
5dc0d613
MB		 758 if (!o || (o->op_flags & OPf_WANT) == OPf_WANT_LIST || error_count
759 || o->op_type == OP_RETURN)
11343788 760 return o;
79072805 761
5dc0d613 762 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 763
11343788 764 switch (o->op_type) {
79072805 765 default:
11343788 766 if (!(opargs[o->op_type] & OA_FOLDCONST))
8990e307 767 break;
36477c24 768 /* FALL THROUGH */
769 case OP_REPEAT:
11343788 770 if (o->op_flags & OPf_STACKED)
8990e307
LW		 771 break;
772 /* FALL THROUGH */
773 case OP_GVSV:
774 case OP_WANTARRAY:
775 case OP_GV:
776 case OP_PADSV:
777 case OP_PADAV:
778 case OP_PADHV:
779 case OP_PADANY:
780 case OP_AV2ARYLEN:
8990e307 781 case OP_REF:
a0d0e21e
LW		 782 case OP_REFGEN:
783 case OP_SREFGEN:
8990e307
LW		 784 case OP_DEFINED:
785 case OP_HEX:
786 case OP_OCT:
787 case OP_LENGTH:
788 case OP_SUBSTR:
789 case OP_VEC:
790 case OP_INDEX:
791 case OP_RINDEX:
792 case OP_SPRINTF:
793 case OP_AELEM:
794 case OP_AELEMFAST:
795 case OP_ASLICE:
8990e307
LW		 796 case OP_HELEM:
797 case OP_HSLICE:
798 case OP_UNPACK:
799 case OP_PACK:
8990e307
LW		 800 case OP_JOIN:
801 case OP_LSLICE:
802 case OP_ANONLIST:
803 case OP_ANONHASH:
804 case OP_SORT:
805 case OP_REVERSE:
806 case OP_RANGE:
807 case OP_FLIP:
808 case OP_FLOP:
809 case OP_CALLER:
810 case OP_FILENO:
811 case OP_EOF:
812 case OP_TELL:
813 case OP_GETSOCKNAME:
814 case OP_GETPEERNAME:
815 case OP_READLINK:
816 case OP_TELLDIR:
817 case OP_GETPPID:
818 case OP_GETPGRP:
819 case OP_GETPRIORITY:
820 case OP_TIME:
821 case OP_TMS:
822 case OP_LOCALTIME:
823 case OP_GMTIME:
824 case OP_GHBYNAME:
825 case OP_GHBYADDR:
826 case OP_GHOSTENT:
827 case OP_GNBYNAME:
828 case OP_GNBYADDR:
829 case OP_GNETENT:
830 case OP_GPBYNAME:
831 case OP_GPBYNUMBER:
832 case OP_GPROTOENT:
833 case OP_GSBYNAME:
834 case OP_GSBYPORT:
835 case OP_GSERVENT:
836 case OP_GPWNAM:
837 case OP_GPWUID:
838 case OP_GGRNAM:
839 case OP_GGRGID:
840 case OP_GETLOGIN:
11343788
MB		 841 if (!(o->op_private & OPpLVAL_INTRO))
842 useless = op_desc[o->op_type];
8990e307
LW		 843 break;
844
845 case OP_RV2GV:
846 case OP_RV2SV:
847 case OP_RV2AV:
848 case OP_RV2HV:
11343788
MB		 849 if (!(o->op_private & OPpLVAL_INTRO) &&
850 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 851 useless = "a variable";
852 break;
79072805 853
93a17b20 854 case OP_NEXTSTATE:
8990e307 855 case OP_DBSTATE:
0f15f207 856 WITH_THR(curcop = ((COP*)o)); /* for warning below */
93a17b20
LW		 857 break;
858
79072805 859 case OP_CONST:
11343788 860 sv = cSVOPo->op_sv;
8990e307
LW		 861 if (dowarn) {
862 useless = "a constant";
863 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
864 useless = 0;
865 else if (SvPOK(sv)) {
866 if (strnEQ(SvPVX(sv), "di", 2) ||
a0d0e21e 867 strnEQ(SvPVX(sv), "ds", 2) ||
8990e307
LW		 868 strnEQ(SvPVX(sv), "ig", 2))
869 useless = 0;
870 }
871 }
11343788 872 null(o); /* don't execute a constant */
8990e307 873 SvREFCNT_dec(sv); /* don't even remember it */
79072805
LW		 874 break;
875
876 case OP_POSTINC:
11343788
MB		 877 o->op_type = OP_PREINC; /* pre-increment is faster */
878 o->op_ppaddr = ppaddr[OP_PREINC];
79072805
LW		 879 break;
880
881 case OP_POSTDEC:
11343788
MB		 882 o->op_type = OP_PREDEC; /* pre-decrement is faster */
883 o->op_ppaddr = ppaddr[OP_PREDEC];
79072805
LW		 884 break;
885
79072805
LW		 886 case OP_OR:
887 case OP_AND:
888 case OP_COND_EXPR:
11343788 889 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 890 scalarvoid(kid);
891 break;
5aabfad6 892
a0d0e21e 893 case OP_NULL:
11343788 894 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
0f15f207 895 WITH_THR(curcop = ((COP*)o)); /* for warning below */
11343788 896 if (o->op_flags & OPf_STACKED)
a0d0e21e 897 break;
5aabfad6 898 /* FALL THROUGH */
79072805
LW		 899 case OP_ENTERTRY:
900 case OP_ENTER:
901 case OP_SCALAR:
11343788 902 if (!(o->op_flags & OPf_KIDS))
79072805 903 break;
54310121 904 /* FALL THROUGH */
463ee0b2 905 case OP_SCOPE:
79072805
LW		 906 case OP_LEAVE:
907 case OP_LEAVETRY:
a0d0e21e 908 case OP_LEAVELOOP:
79072805 909 case OP_LINESEQ:
79072805 910 case OP_LIST:
11343788 911 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 912 scalarvoid(kid);
913 break;
c90c0ff4 914 case OP_ENTEREVAL:
5196be3e 915 scalarkids(o);
c90c0ff4 916 break;
5aabfad6 917 case OP_REQUIRE:
c90c0ff4 918 /* all requires must return a boolean value */
5196be3e
MB		 919 o->op_flags &= ~OPf_WANT;
920 return scalar(o);
a0d0e21e 921 case OP_SPLIT:
11343788 922 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 923 if (!kPMOP->op_pmreplroot)
924 deprecate("implicit split to @_");
925 }
926 break;
79072805 927 }
8990e307
LW		 928 if (useless && dowarn)
929 warn("Useless use of %s in void context", useless);
11343788 930 return o;
79072805
LW		 931}
932
933OP *
8ac85365 934listkids(OP *o)
79072805
LW		 935{
936 OP *kid;
11343788
MB		 937 if (o && o->op_flags & OPf_KIDS) {
938 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 939 list(kid);
940 }
11343788 941 return o;
79072805
LW		 942}
943
944OP *
8ac85365 945list(OP *o)
79072805
LW		 946{
947 OP *kid;
948
a0d0e21e 949 /* assumes no premature commitment */
5dc0d613
MB		 950 if (!o || (o->op_flags & OPf_WANT) || error_count
951 || o->op_type == OP_RETURN)
11343788 952 return o;
79072805 953
5dc0d613 954 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 955
11343788 956 switch (o->op_type) {
79072805
LW		 957 case OP_FLOP:
958 case OP_REPEAT:
11343788 959 list(cBINOPo->op_first);
79072805
LW		 960 break;
961 case OP_OR:
962 case OP_AND:
963 case OP_COND_EXPR:
11343788 964 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 965 list(kid);
966 break;
967 default:
968 case OP_MATCH:
969 case OP_SUBST:
970 case OP_NULL:
11343788 971 if (!(o->op_flags & OPf_KIDS))
79072805 972 break;
11343788
MB		 973 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
974 list(cBINOPo->op_first);
975 return gen_constant_list(o);
79072805
LW		 976 }
977 case OP_LIST:
11343788 978 listkids(o);
79072805
LW		 979 break;
980 case OP_LEAVE:
981 case OP_LEAVETRY:
5dc0d613 982 kid = cLISTOPo->op_first;
54310121 983 list(kid);
984 while (kid = kid->op_sibling) {
985 if (kid->op_sibling)
986 scalarvoid(kid);
987 else
988 list(kid);
989 }
0f15f207 990 WITH_THR(curcop = &compiling);
54310121 991 break;
748a9306 992 case OP_SCOPE:
79072805 993 case OP_LINESEQ:
11343788 994 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 995 if (kid->op_sibling)
996 scalarvoid(kid);
997 else
998 list(kid);
999 }
0f15f207 1000 WITH_THR(curcop = &compiling);
79072805 1001 break;
c90c0ff4 1002 case OP_REQUIRE:
1003 /* all requires must return a boolean value */
5196be3e
MB		 1004 o->op_flags &= ~OPf_WANT;
1005 return scalar(o);
79072805 1006 }
11343788 1007 return o;
79072805
LW		 1008}
1009
1010OP *
8ac85365 1011scalarseq(OP *o)
79072805
LW		 1012{
1013 OP *kid;
1014
11343788
MB		 1015 if (o) {
1016 if (o->op_type == OP_LINESEQ ||
1017 o->op_type == OP_SCOPE ||
1018 o->op_type == OP_LEAVE ||
1019 o->op_type == OP_LEAVETRY)
463ee0b2 1020 {
0f15f207 1021 dTHR;
11343788 1022 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1023 if (kid->op_sibling) {
463ee0b2 1024 scalarvoid(kid);
ed6116ce 1025 }
463ee0b2
LW		 1026 }
1027 curcop = &compiling;
79072805 1028 }
11343788 1029 o->op_flags &= ~OPf_PARENS;
85e6fe83 1030 if (hints & HINT_BLOCK_SCOPE)
11343788 1031 o->op_flags |= OPf_PARENS;
79072805 1032 }
8990e307 1033 else
11343788
MB		 1034 o = newOP(OP_STUB, 0);
1035 return o;
79072805
LW		 1036}
1037
a0d0e21e 1038static OP *
8ac85365 1039modkids(OP *o, I32 type)
79072805
LW		 1040{
1041 OP *kid;
11343788
MB		 1042 if (o && o->op_flags & OPf_KIDS) {
1043 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1044 mod(kid, type);
79072805 1045 }
11343788 1046 return o;
79072805
LW		 1047}
1048
463ee0b2 1049static I32 modcount;
79072805
LW		 1050
1051OP *
8ac85365 1052mod(OP *o, I32 type)
79072805 1053{
11343788 1054 dTHR;
79072805
LW		 1055 OP *kid;
1056 SV *sv;
1057
11343788
MB		 1058 if (!o || error_count)
1059 return o;
79072805 1060
11343788 1061 switch (o->op_type) {
68dc0745 1062 case OP_UNDEF:
3e3baf6d 1063 modcount++;
5dc0d613 1064 return o;
a0d0e21e 1065 case OP_CONST:
11343788 1066 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e
LW		 1067 goto nomod;
1068 if (eval_start && eval_start->op_type == OP_CONST) {
1069 compiling.cop_arybase = (I32)SvIV(((SVOP*)eval_start)->op_sv);
1070 eval_start = 0;
1071 }
1072 else if (!type) {
1073 SAVEI32(compiling.cop_arybase);
748a9306 1074 compiling.cop_arybase = 0;
a0d0e21e
LW		 1075 }
1076 else if (type == OP_REFGEN)
1077 goto nomod;
1078 else
1079 croak("That use of $[ is unsupported");
1080 break;
5f05dabc 1081 case OP_STUB:
5196be3e 1082 if (o->op_flags & OPf_PARENS)
5f05dabc 1083 break;
1084 goto nomod;
a0d0e21e
LW		 1085 case OP_ENTERSUB:
1086 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1087 !(o->op_flags & OPf_STACKED)) {
1088 o->op_type = OP_RV2CV; /* entersub => rv2cv */
1089 o->op_ppaddr = ppaddr[OP_RV2CV];
1090 assert(cUNOPo->op_first->op_type == OP_NULL);
1091 null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1092 break;
1093 }
1094 /* FALL THROUGH */
1095 default:
a0d0e21e
LW		 1096 nomod:
1097 /* grep, foreach, subcalls, refgen */
1098 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1099 break;
46fc3d4c 1100 yyerror(form("Can't modify %s in %s",
5dc0d613 1101 op_desc[o->op_type],
46fc3d4c 1102 type ? op_desc[type] : "local"));
11343788 1103 return o;
79072805 1104
a0d0e21e
LW		 1105 case OP_PREINC:
1106 case OP_PREDEC:
1107 case OP_POW:
1108 case OP_MULTIPLY:
1109 case OP_DIVIDE:
1110 case OP_MODULO:
1111 case OP_REPEAT:
1112 case OP_ADD:
1113 case OP_SUBTRACT:
1114 case OP_CONCAT:
1115 case OP_LEFT_SHIFT:
1116 case OP_RIGHT_SHIFT:
1117 case OP_BIT_AND:
1118 case OP_BIT_XOR:
1119 case OP_BIT_OR:
1120 case OP_I_MULTIPLY:
1121 case OP_I_DIVIDE:
1122 case OP_I_MODULO:
1123 case OP_I_ADD:
1124 case OP_I_SUBTRACT:
11343788 1125 if (!(o->op_flags & OPf_STACKED))
a0d0e21e
LW		 1126 goto nomod;
1127 modcount++;
1128 break;
1129
79072805 1130 case OP_COND_EXPR:
11343788 1131 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1132 mod(kid, type);
79072805
LW		 1133 break;
1134
1135 case OP_RV2AV:
1136 case OP_RV2HV:
93af7a87 1137 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1138 croak("Can't localize through a reference");
11343788 1139 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
748a9306 1140 modcount = 10000;
11343788 1141 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1142 }
1143 /* FALL THROUGH */
79072805 1144 case OP_RV2GV:
5dc0d613 1145 if (scalar_mod_type(o, type))
3fe9a6f1 1146 goto nomod;
11343788 1147 ref(cUNOPo->op_first, o->op_type);
79072805
LW		 1148 /* FALL THROUGH */
1149 case OP_AASSIGN:
1150 case OP_ASLICE:
1151 case OP_HSLICE:
93a17b20
LW		 1152 case OP_NEXTSTATE:
1153 case OP_DBSTATE:
a0d0e21e
LW		 1154 case OP_REFGEN:
1155 case OP_CHOMP:
463ee0b2 1156 modcount = 10000;
79072805 1157 break;
463ee0b2 1158 case OP_RV2SV:
11343788 1159 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1160 croak("Can't localize through a reference");
aeea060c 1161 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1162 /* FALL THROUGH */
79072805 1163 case OP_GV:
463ee0b2 1164 case OP_AV2ARYLEN:
85aff577 1165 hints |= HINT_BLOCK_SCOPE;
463ee0b2 1166 case OP_SASSIGN:
8990e307
LW		 1167 case OP_AELEMFAST:
1168 modcount++;
1169 break;
1170
748a9306
LW		 1171 case OP_PADAV:
1172 case OP_PADHV:
1173 modcount = 10000;
5196be3e
MB		 1174 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1175 return o; /* Treat \(@foo) like ordinary list. */
1176 if (scalar_mod_type(o, type))
3fe9a6f1 1177 goto nomod;
748a9306
LW		 1178 /* FALL THROUGH */
1179 case OP_PADSV:
1180 modcount++;
1181 if (!type)
1182 croak("Can't localize lexical variable %s",
11343788 1183 SvPV(*av_fetch(comppad_name, o->op_targ, 4), na));
463ee0b2
LW		 1184 break;
1185
554b3eca 1186#ifdef USE_THREADS
2faa37cc 1187 case OP_THREADSV:
554b3eca 1188 modcount++; /* XXX ??? */
554b3eca
MB		 1189 break;
1190#endif /* USE_THREADS */
1191
748a9306
LW		 1192 case OP_PUSHMARK:
1193 break;
a0d0e21e 1194
69969c6f
SB		 1195 case OP_KEYS:
1196 if (type != OP_SASSIGN)
1197 goto nomod;
5f05dabc 1198 /* FALL THROUGH */
a0d0e21e 1199 case OP_POS:
463ee0b2 1200 case OP_VEC:
a0d0e21e 1201 case OP_SUBSTR:
11343788
MB		 1202 pad_free(o->op_targ);
1203 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1204 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1205 if (o->op_flags & OPf_KIDS)
1206 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1207 break;
a0d0e21e 1208
463ee0b2
LW		 1209 case OP_AELEM:
1210 case OP_HELEM:
11343788 1211 ref(cBINOPo->op_first, o->op_type);
68dc0745 1212 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1213 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1214 o->op_private |= OPpLVAL_DEFER;
a0d0e21e 1215 modcount++;
463ee0b2
LW		 1216 break;
1217
1218 case OP_SCOPE:
1219 case OP_LEAVE:
1220 case OP_ENTER:
11343788
MB		 1221 if (o->op_flags & OPf_KIDS)
1222 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1223 break;
1224
1225 case OP_NULL:
11343788 1226 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1227 break;
11343788
MB		 1228 if (o->op_targ != OP_LIST) {
1229 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1230 break;
1231 }
1232 /* FALL THROUGH */
463ee0b2 1233 case OP_LIST:
11343788 1234 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1235 mod(kid, type);
1236 break;
1237 }
11343788 1238 o->op_flags |= OPf_MOD;
a0d0e21e
LW		 1239
1240 if (type == OP_AASSIGN || type == OP_SASSIGN)
11343788 1241 o->op_flags |= OPf_SPECIAL|OPf_REF;
a0d0e21e 1242 else if (!type) {
11343788
MB		 1243 o->op_private |= OPpLVAL_INTRO;
1244 o->op_flags &= ~OPf_SPECIAL;
463ee0b2 1245 }
a0d0e21e 1246 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
11343788
MB		 1247 o->op_flags |= OPf_REF;
1248 return o;
463ee0b2
LW		 1249}
1250
3fe9a6f1 1251static bool
8ac85365 1252scalar_mod_type(OP *o, I32 type)
3fe9a6f1 1253{
1254 switch (type) {
1255 case OP_SASSIGN:
5196be3e 1256 if (o->op_type == OP_RV2GV)
3fe9a6f1 1257 return FALSE;
1258 /* FALL THROUGH */
1259 case OP_PREINC:
1260 case OP_PREDEC:
1261 case OP_POSTINC:
1262 case OP_POSTDEC:
1263 case OP_I_PREINC:
1264 case OP_I_PREDEC:
1265 case OP_I_POSTINC:
1266 case OP_I_POSTDEC:
1267 case OP_POW:
1268 case OP_MULTIPLY:
1269 case OP_DIVIDE:
1270 case OP_MODULO:
1271 case OP_REPEAT:
1272 case OP_ADD:
1273 case OP_SUBTRACT:
1274 case OP_I_MULTIPLY:
1275 case OP_I_DIVIDE:
1276 case OP_I_MODULO:
1277 case OP_I_ADD:
1278 case OP_I_SUBTRACT:
1279 case OP_LEFT_SHIFT:
1280 case OP_RIGHT_SHIFT:
1281 case OP_BIT_AND:
1282 case OP_BIT_XOR:
1283 case OP_BIT_OR:
1284 case OP_CONCAT:
1285 case OP_SUBST:
1286 case OP_TRANS:
1287 case OP_ANDASSIGN: /* may work later */
1288 case OP_ORASSIGN: /* may work later */
1289 return TRUE;
1290 default:
1291 return FALSE;
1292 }
1293}
1294
463ee0b2 1295OP *
8ac85365 1296refkids(OP *o, I32 type)
463ee0b2
LW		 1297{
1298 OP *kid;
11343788
MB		 1299 if (o && o->op_flags & OPf_KIDS) {
1300 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1301 ref(kid, type);
1302 }
11343788 1303 return o;
463ee0b2
LW		 1304}
1305
1306OP *
8ac85365 1307ref(OP *o, I32 type)
463ee0b2
LW		 1308{
1309 OP *kid;
463ee0b2 1310
11343788
MB		 1311 if (!o || error_count)
1312 return o;
463ee0b2 1313
11343788 1314 switch (o->op_type) {
a0d0e21e 1315 case OP_ENTERSUB:
e55aaa0e 1316 if ((type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1317 !(o->op_flags & OPf_STACKED)) {
1318 o->op_type = OP_RV2CV; /* entersub => rv2cv */
1319 o->op_ppaddr = ppaddr[OP_RV2CV];
1320 assert(cUNOPo->op_first->op_type == OP_NULL);
1321 null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
1322 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1323 }
1324 break;
aeea060c 1325
463ee0b2 1326 case OP_COND_EXPR:
11343788 1327 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1328 ref(kid, type);
1329 break;
8990e307 1330 case OP_RV2SV:
11343788 1331 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1332 /* FALL THROUGH */
1333 case OP_PADSV:
5f05dabc 1334 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1335 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1336 : type == OP_RV2HV ? OPpDEREF_HV
1337 : OPpDEREF_SV);
11343788 1338 o->op_flags |= OPf_MOD;
a0d0e21e 1339 }
8990e307
LW		 1340 break;
1341
2faa37cc 1342 case OP_THREADSV:
a863c7d1
MB		 1343 o->op_flags |= OPf_MOD; /* XXX ??? */
1344 break;
1345
463ee0b2
LW		 1346 case OP_RV2AV:
1347 case OP_RV2HV:
aeea060c 1348 o->op_flags |= OPf_REF;
8990e307 1349 /* FALL THROUGH */
463ee0b2 1350 case OP_RV2GV:
11343788 1351 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1352 break;
8990e307 1353
463ee0b2
LW		 1354 case OP_PADAV:
1355 case OP_PADHV:
aeea060c 1356 o->op_flags |= OPf_REF;
79072805 1357 break;
aeea060c 1358
8990e307 1359 case OP_SCALAR:
79072805 1360 case OP_NULL:
11343788 1361 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1362 break;
11343788 1363 ref(cBINOPo->op_first, type);
79072805
LW		 1364 break;
1365 case OP_AELEM:
1366 case OP_HELEM:
11343788 1367 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1368 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1369 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1370 : type == OP_RV2HV ? OPpDEREF_HV
1371 : OPpDEREF_SV);
11343788 1372 o->op_flags |= OPf_MOD;
8990e307 1373 }
79072805
LW		 1374 break;
1375
463ee0b2 1376 case OP_SCOPE:
79072805
LW		 1377 case OP_LEAVE:
1378 case OP_ENTER:
8990e307 1379 case OP_LIST:
11343788 1380 if (!(o->op_flags & OPf_KIDS))
79072805 1381 break;
11343788 1382 ref(cLISTOPo->op_last, type);
79072805 1383 break;
a0d0e21e
LW		 1384 default:
1385 break;
79072805 1386 }
11343788 1387 return scalar(o);
8990e307 1388
79072805
LW		 1389}
1390
1391OP *
8ac85365 1392my(OP *o)
93a17b20
LW		 1393{
1394 OP *kid;
93a17b20
LW		 1395 I32 type;
1396
11343788
MB		 1397 if (!o || error_count)
1398 return o;
93a17b20 1399
11343788 1400 type = o->op_type;
93a17b20 1401 if (type == OP_LIST) {
11343788 1402 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
93a17b20
LW		 1403 my(kid);
1404 }
1405 else if (type != OP_PADSV &&
1406 type != OP_PADAV &&
1407 type != OP_PADHV &&
1408 type != OP_PUSHMARK)
1409 {
5dc0d613 1410 yyerror(form("Can't declare %s in my", op_desc[o->op_type]));
11343788 1411 return o;
93a17b20 1412 }
11343788
MB		 1413 o->op_flags |= OPf_MOD;
1414 o->op_private |= OPpLVAL_INTRO;
1415 return o;
93a17b20
LW		 1416}
1417
1418OP *
8ac85365 1419sawparens(OP *o)
79072805
LW		 1420{
1421 if (o)
1422 o->op_flags |= OPf_PARENS;
1423 return o;
1424}
1425
1426OP *
8ac85365 1427bind_match(I32 type, OP *left, OP *right)
79072805 1428{
11343788 1429 OP *o;
79072805 1430
2ae324a7 1431 if (dowarn &&
1432 (left->op_type == OP_RV2AV ||
1433 left->op_type == OP_RV2HV ||
1434 left->op_type == OP_PADAV ||
1435 left->op_type == OP_PADHV)) {
1436 char *desc = op_desc[(right->op_type == OP_SUBST ||
1437 right->op_type == OP_TRANS)
1438 ? right->op_type : OP_MATCH];
1439 char *sample = ((left->op_type == OP_RV2AV ||
1440 left->op_type == OP_PADAV)
1441 ? "@array" : "%hash");
1442 warn("Applying %s to %s will act on scalar(%s)", desc, sample, sample);
1443 }
1444
79072805
LW		 1445 if (right->op_type == OP_MATCH ||
1446 right->op_type == OP_SUBST ||
1447 right->op_type == OP_TRANS) {
1448 right->op_flags |= OPf_STACKED;
1449 if (right->op_type != OP_MATCH)
463ee0b2 1450 left = mod(left, right->op_type);
79072805 1451 if (right->op_type == OP_TRANS)
11343788 1452 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1453 else
11343788 1454 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1455 if (type == OP_NOT)
11343788
MB		 1456 return newUNOP(OP_NOT, 0, scalar(o));
1457 return o;
79072805
LW		 1458 }
1459 else
1460 return bind_match(type, left,
1461 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1462}
1463
1464OP *
8ac85365 1465invert(OP *o)
79072805 1466{
11343788
MB		 1467 if (!o)
1468 return o;
79072805 1469 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1470 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1471}
1472
1473OP *
8ac85365 1474scope(OP *o)
79072805
LW		 1475{
1476 if (o) {
84902520 1477 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || tainting) {
463ee0b2
LW		 1478 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1479 o->op_type = OP_LEAVE;
1480 o->op_ppaddr = ppaddr[OP_LEAVE];
1481 }
1482 else {
1483 if (o->op_type == OP_LINESEQ) {
1484 OP *kid;
1485 o->op_type = OP_SCOPE;
1486 o->op_ppaddr = ppaddr[OP_SCOPE];
1487 kid = ((LISTOP*)o)->op_first;
748a9306
LW		 1488 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
1489 SvREFCNT_dec(((COP*)kid)->cop_filegv);
8990e307 1490 null(kid);
748a9306 1491 }
463ee0b2
LW		 1492 }
1493 else
748a9306 1494 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1495 }
79072805
LW		 1496 }
1497 return o;
1498}
1499
a0d0e21e 1500int
8ac85365 1501block_start(int full)
79072805 1502{
11343788 1503 dTHR;
a0d0e21e 1504 int retval = savestack_ix;
55497cff 1505 SAVEI32(comppad_name_floor);
1506 if (full) {
93965878 1507 if ((comppad_name_fill = AvFILLp(comppad_name)) > 0)
55497cff 1508 comppad_name_floor = comppad_name_fill;
1509 else
1510 comppad_name_floor = 0;
1511 }
1512 SAVEI32(min_intro_pending);
1513 SAVEI32(max_intro_pending);
a0d0e21e 1514 min_intro_pending = 0;
55497cff 1515 SAVEI32(comppad_name_fill);
1516 SAVEI32(padix_floor);
a0d0e21e
LW		 1517 padix_floor = padix;
1518 pad_reset_pending = FALSE;
55497cff 1519 SAVEI32(hints);
a0d0e21e
LW		 1520 hints &= ~HINT_BLOCK_SCOPE;
1521 return retval;
1522}
1523
1524OP*
8ac85365 1525block_end(I32 floor, OP *seq)
a0d0e21e 1526{
11343788 1527 dTHR;
a0d0e21e
LW		 1528 int needblockscope = hints & HINT_BLOCK_SCOPE;
1529 OP* retval = scalarseq(seq);
a0d0e21e
LW		 1530 LEAVE_SCOPE(floor);
1531 pad_reset_pending = FALSE;
1532 if (needblockscope)
1533 hints |= HINT_BLOCK_SCOPE; /* propagate out */
1534 pad_leavemy(comppad_name_fill);
bbce6d69 1535 cop_seqmax++;
a0d0e21e
LW		 1536 return retval;
1537}
1538
54b9620d
MB		 1539static OP *
1540newDEFSVOP(void)
1541{
1542#ifdef USE_THREADS
1543 OP *o = newOP(OP_THREADSV, 0);
1544 o->op_targ = find_threadsv("_");
1545 return o;
1546#else
1547 return newSVREF(newGVOP(OP_GV, 0, defgv));
1548#endif /* USE_THREADS */
1549}
1550
a0d0e21e 1551void
8ac85365 1552newPROG(OP *o)
a0d0e21e 1553{
11343788 1554 dTHR;
a0d0e21e 1555 if (in_eval) {
5dc0d613 1556 eval_root = newUNOP(OP_LEAVEEVAL, ((in_eval & 4) ? OPf_SPECIAL : 0), o);
a0d0e21e
LW		 1557 eval_start = linklist(eval_root);
1558 eval_root->op_next = 0;
1559 peep(eval_start);
1560 }
1561 else {
5dc0d613 1562 if (!o)
a0d0e21e 1563 return;
11343788 1564 main_root = scope(sawparens(scalarvoid(o)));
a0d0e21e
LW		 1565 curcop = &compiling;
1566 main_start = LINKLIST(main_root);
1567 main_root->op_next = 0;
1568 peep(main_start);
748a9306 1569 compcv = 0;
3841441e 1570
4fdae800 1571 /* Register with debugger */
84902520 1572 if (PERLDB_INTER) {
3841441e 1573 CV *cv = perl_get_cv("DB::postponed", FALSE);
3841441e
CS		 1574 if (cv) {
1575 dSP;
1576 PUSHMARK(sp);
1577 XPUSHs((SV*)compiling.cop_filegv);
1578 PUTBACK;
1579 perl_call_sv((SV*)cv, G_DISCARD);
1580 }
1581 }
79072805 1582 }
79072805
LW		 1583}
1584
1585OP *
8ac85365 1586localize(OP *o, I32 lex)
79072805
LW		 1587{
1588 if (o->op_flags & OPf_PARENS)
1589 list(o);
8990e307 1590 else {
79072805 1591 scalar(o);
8990e307
LW		 1592 if (dowarn && bufptr > oldbufptr && bufptr[-1] == ',') {
1593 char *s;
1594 for (s = bufptr; *s && (isALNUM(*s) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1595 if (*s == ';' || *s == '=')
8990e307
LW		 1596 warn("Parens missing around \"%s\" list", lex ? "my" : "local");
1597 }
1598 }
93a17b20 1599 in_my = FALSE;
c750a3ec 1600 in_my_stash = Nullhv;
93a17b20
LW		 1601 if (lex)
1602 return my(o);
1603 else
463ee0b2 1604 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 1605}
1606
1607OP *
8ac85365 1608jmaybe(OP *o)
79072805
LW		 1609{
1610 if (o->op_type == OP_LIST) {
554b3eca
MB		 1611 OP *o2;
1612#ifdef USE_THREADS
2faa37cc 1613 o2 = newOP(OP_THREADSV, 0);
54b9620d 1614 o2->op_targ = find_threadsv(";");
554b3eca
MB		 1615#else
1616 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
1617#endif /* USE_THREADS */
1618 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 1619 }
1620 return o;
1621}
1622
1623OP *
8ac85365 1624fold_constants(register OP *o)
79072805 1625{
11343788 1626 dTHR;
79072805
LW		 1627 register OP *curop;
1628 I32 type = o->op_type;
748a9306 1629 SV *sv;
79072805
LW		 1630
1631 if (opargs[type] & OA_RETSCALAR)
1632 scalar(o);
1633 if (opargs[type] & OA_TARGET)
ed6116ce 1634 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1635
85e6fe83 1636 if ((opargs[type] & OA_OTHERINT) && (hints & HINT_INTEGER))
a0d0e21e 1637 o->op_ppaddr = ppaddr[type = ++(o->op_type)];
85e6fe83 1638
79072805
LW		 1639 if (!(opargs[type] & OA_FOLDCONST))
1640 goto nope;
1641
de939608
CS		 1642 switch (type) {
1643 case OP_SPRINTF:
1644 case OP_UCFIRST:
1645 case OP_LCFIRST:
1646 case OP_UC:
1647 case OP_LC:
1648 if (o->op_private & OPpLOCALE)
1649 goto nope;
1650 }
1651
a0d0e21e
LW		 1652 if (error_count)
1653 goto nope; /* Don't try to run w/ errors */
1654
79072805 1655 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
93a17b20
LW		 1656 if (curop->op_type != OP_CONST &&
1657 curop->op_type != OP_LIST &&
1658 curop->op_type != OP_SCALAR &&
a0d0e21e 1659 curop->op_type != OP_NULL &&
93a17b20 1660 curop->op_type != OP_PUSHMARK) {
79072805
LW		 1661 goto nope;
1662 }
1663 }
1664
1665 curop = LINKLIST(o);
1666 o->op_next = 0;
1667 op = curop;
8da795c6 1668 runops();
748a9306
LW		 1669 sv = *(stack_sp--);
1670 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 1671 pad_swipe(o->op_targ);
748a9306
LW		 1672 else if (SvTEMP(sv)) { /* grab mortal temp? */
1673 (void)SvREFCNT_inc(sv);
1674 SvTEMP_off(sv);
85e6fe83 1675 }
79072805
LW		 1676 op_free(o);
1677 if (type == OP_RV2GV)
b1cb66bf 1678 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306
LW		 1679 else {
1680 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK) {
1681 IV iv = SvIV(sv);
1682 if ((double)iv == SvNV(sv)) { /* can we smush double to int */
1683 SvREFCNT_dec(sv);
1684 sv = newSViv(iv);
1685 }
b1cb66bf 1686 else
1687 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 1688 }
1689 return newSVOP(OP_CONST, 0, sv);
1690 }
aeea060c 1691
79072805
LW		 1692 nope:
1693 if (!(opargs[type] & OA_OTHERINT))
1694 return o;
79072805 1695
85e6fe83 1696 if (!(hints & HINT_INTEGER)) {
a0d0e21e 1697 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 1698 return o;
1699
1700 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
1701 if (curop->op_type == OP_CONST) {
b1cb66bf 1702 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 1703 continue;
1704 return o;
1705 }
1706 if (opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 1707 continue;
1708 return o;
1709 }
a0d0e21e 1710 o->op_ppaddr = ppaddr[++(o->op_type)];
79072805
LW		 1711 }
1712
79072805
LW		 1713 return o;
1714}
1715
1716OP *
8ac85365 1717gen_constant_list(register OP *o)
79072805 1718{
11343788 1719 dTHR;
79072805 1720 register OP *curop;
79072805 1721 I32 oldtmps_floor = tmps_floor;
79072805 1722
a0d0e21e
LW		 1723 list(o);
1724 if (error_count)
1725 return o; /* Don't attempt to run with errors */
1726
1727 op = curop = LINKLIST(o);
1728 o->op_next = 0;
11343788 1729 pp_pushmark(ARGS);
8da795c6 1730 runops();
a0d0e21e 1731 op = curop;
11343788 1732 pp_anonlist(ARGS);
79072805 1733 tmps_floor = oldtmps_floor;
79072805
LW		 1734
1735 o->op_type = OP_RV2AV;
1736 o->op_ppaddr = ppaddr[OP_RV2AV];
79072805 1737 curop = ((UNOP*)o)->op_first;
a0d0e21e 1738 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*stack_sp--));
79072805 1739 op_free(curop);
79072805
LW		 1740 linklist(o);
1741 return list(o);
1742}
1743
1744OP *
8ac85365 1745convert(I32 type, I32 flags, OP *o)
79072805
LW		 1746{
1747 OP *kid;
a0d0e21e 1748 OP *last = 0;
79072805 1749
11343788
MB		 1750 if (!o || o->op_type != OP_LIST)
1751 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 1752 else
5dc0d613 1753 o->op_flags &= ~OPf_WANT;
79072805 1754
8990e307 1755 if (!(opargs[type] & OA_MARK))
11343788 1756 null(cLISTOPo->op_first);
8990e307 1757
11343788
MB		 1758 o->op_type = type;
1759 o->op_ppaddr = ppaddr[type];
1760 o->op_flags |= flags;
79072805 1761
11343788
MB		 1762 o = CHECKOP(type, o);
1763 if (o->op_type != type)
1764 return o;
79072805 1765
11343788 1766 if (cLISTOPo->op_children < 7) {
79072805 1767 /* XXX do we really need to do this if we're done appending?? */
11343788 1768 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805 1769 last = kid;
11343788 1770 cLISTOPo->op_last = last; /* in case check substituted last arg */
79072805
LW		 1771 }
1772
11343788 1773 return fold_constants(o);
79072805
LW		 1774}
1775
1776/* List constructors */
1777
1778OP *
8ac85365 1779append_elem(I32 type, OP *first, OP *last)
79072805
LW		 1780{
1781 if (!first)
1782 return last;
8990e307
LW		 1783
1784 if (!last)
79072805 1785 return first;
8990e307 1786
a0d0e21e
LW		 1787 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
1788 return newLISTOP(type, 0, first, last);
79072805 1789
a0d0e21e
LW		 1790 if (first->op_flags & OPf_KIDS)
1791 ((LISTOP*)first)->op_last->op_sibling = last;
1792 else {
1793 first->op_flags |= OPf_KIDS;
1794 ((LISTOP*)first)->op_first = last;
1795 }
1796 ((LISTOP*)first)->op_last = last;
1797 ((LISTOP*)first)->op_children++;
1798 return first;
79072805
LW		 1799}
1800
1801OP *
8ac85365 1802append_list(I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 1803{
1804 if (!first)
1805 return (OP*)last;
8990e307
LW		 1806
1807 if (!last)
79072805 1808 return (OP*)first;
8990e307
LW		 1809
1810 if (first->op_type != type)
79072805 1811 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 1812
1813 if (last->op_type != type)
79072805
LW		 1814 return append_elem(type, (OP*)first, (OP*)last);
1815
1816 first->op_last->op_sibling = last->op_first;
1817 first->op_last = last->op_last;
1818 first->op_children += last->op_children;
1819 if (first->op_children)
1820 last->op_flags |= OPf_KIDS;
1821
1822 Safefree(last);
1823 return (OP*)first;
1824}
1825
1826OP *
8ac85365 1827prepend_elem(I32 type, OP *first, OP *last)
79072805
LW		 1828{
1829 if (!first)
1830 return last;
8990e307
LW		 1831
1832 if (!last)
79072805 1833 return first;
8990e307
LW		 1834
1835 if (last->op_type == type) {
1836 if (type == OP_LIST) { /* already a PUSHMARK there */
1837 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
1838 ((LISTOP*)last)->op_first->op_sibling = first;
1839 }
1840 else {
1841 if (!(last->op_flags & OPf_KIDS)) {
1842 ((LISTOP*)last)->op_last = first;
1843 last->op_flags |= OPf_KIDS;
1844 }
1845 first->op_sibling = ((LISTOP*)last)->op_first;
1846 ((LISTOP*)last)->op_first = first;
79072805 1847 }
79072805
LW		 1848 ((LISTOP*)last)->op_children++;
1849 return last;
1850 }
1851
1852 return newLISTOP(type, 0, first, last);
1853}
1854
1855/* Constructors */
1856
1857OP *
8ac85365 1858newNULLLIST(void)
79072805 1859{
8990e307
LW		 1860 return newOP(OP_STUB, 0);
1861}
1862
1863OP *
8ac85365 1864force_list(OP *o)
8990e307 1865{
11343788
MB		 1866 if (!o || o->op_type != OP_LIST)
1867 o = newLISTOP(OP_LIST, 0, o, Nullop);
1868 null(o);
1869 return o;
79072805
LW		 1870}
1871
1872OP *
8ac85365 1873newLISTOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 1874{
1875 LISTOP *listop;
1876
1877 Newz(1101, listop, 1, LISTOP);
1878
1879 listop->op_type = type;
1880 listop->op_ppaddr = ppaddr[type];
1881 listop->op_children = (first != 0) + (last != 0);
1882 listop->op_flags = flags;
79072805
LW		 1883
1884 if (!last && first)
1885 last = first;
1886 else if (!first && last)
1887 first = last;
8990e307
LW		 1888 else if (first)
1889 first->op_sibling = last;
79072805
LW		 1890 listop->op_first = first;
1891 listop->op_last = last;
8990e307
LW		 1892 if (type == OP_LIST) {
1893 OP* pushop;
1894 pushop = newOP(OP_PUSHMARK, 0);
1895 pushop->op_sibling = first;
1896 listop->op_first = pushop;
1897 listop->op_flags |= OPf_KIDS;
1898 if (!last)
1899 listop->op_last = pushop;
1900 }
1901 else if (listop->op_children)
1902 listop->op_flags |= OPf_KIDS;
79072805
LW		 1903
1904 return (OP*)listop;
1905}
1906
1907OP *
8ac85365 1908newOP(I32 type, I32 flags)
79072805 1909{
11343788
MB		 1910 OP *o;
1911 Newz(1101, o, 1, OP);
1912 o->op_type = type;
1913 o->op_ppaddr = ppaddr[type];
1914 o->op_flags = flags;
79072805 1915
11343788
MB		 1916 o->op_next = o;
1917 o->op_private = 0 + (flags >> 8);
79072805 1918 if (opargs[type] & OA_RETSCALAR)
11343788 1919 scalar(o);
79072805 1920 if (opargs[type] & OA_TARGET)
11343788
MB		 1921 o->op_targ = pad_alloc(type, SVs_PADTMP);
1922 return CHECKOP(type, o);
79072805
LW		 1923}
1924
1925OP *
8ac85365 1926newUNOP(I32 type, I32 flags, OP *first)
79072805
LW		 1927{
1928 UNOP *unop;
1929
93a17b20 1930 if (!first)
aeea060c 1931 first = newOP(OP_STUB, 0);
8990e307
LW		 1932 if (opargs[type] & OA_MARK)
1933 first = force_list(first);
93a17b20 1934
79072805
LW		 1935 Newz(1101, unop, 1, UNOP);
1936 unop->op_type = type;
1937 unop->op_ppaddr = ppaddr[type];
1938 unop->op_first = first;
1939 unop->op_flags = flags | OPf_KIDS;
c07a80fd 1940 unop->op_private = 1 | (flags >> 8);
c277df42
IZ		 1941#if 1
1942 if(type == OP_STUDY && first->op_type == OP_MATCH) {
1943 first->op_type = OP_PUSHRE;
1944 first->op_ppaddr = ppaddr[OP_PUSHRE];
1945 }
1946#endif
e50aee73 1947 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 1948 if (unop->op_next)
1949 return (OP*)unop;
1950
a0d0e21e 1951 return fold_constants((OP *) unop);
79072805
LW		 1952}
1953
1954OP *
8ac85365 1955newBINOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 1956{
1957 BINOP *binop;
1958 Newz(1101, binop, 1, BINOP);
1959
1960 if (!first)
1961 first = newOP(OP_NULL, 0);
1962
1963 binop->op_type = type;
1964 binop->op_ppaddr = ppaddr[type];
1965 binop->op_first = first;
1966 binop->op_flags = flags | OPf_KIDS;
1967 if (!last) {
1968 last = first;
c07a80fd 1969 binop->op_private = 1 | (flags >> 8);
79072805
LW		 1970 }
1971 else {
c07a80fd 1972 binop->op_private = 2 | (flags >> 8);
79072805
LW		 1973 first->op_sibling = last;
1974 }
1975
e50aee73 1976 binop = (BINOP*)CHECKOP(type, binop);
79072805
LW		 1977 if (binop->op_next)
1978 return (OP*)binop;
1979
1980 binop->op_last = last = binop->op_first->op_sibling;
1981
a0d0e21e 1982 return fold_constants((OP *)binop);
79072805
LW		 1983}
1984
1985OP *
8ac85365 1986pmtrans(OP *o, OP *expr, OP *repl)
79072805 1987{
79072805
LW		 1988 SV *tstr = ((SVOP*)expr)->op_sv;
1989 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 1990 STRLEN tlen;
1991 STRLEN rlen;
ec49126f 1992 register U8 *t = (U8*)SvPV(tstr, tlen);
1993 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 1994 register I32 i;
1995 register I32 j;
8ac85365 1996 I32 Delete;
79072805 1997 I32 complement;
5d06d08e 1998 I32 squash;
79072805
LW		 1999 register short *tbl;
2000
11343788
MB		 2001 tbl = (short*)cPVOPo->op_pv;
2002 complement = o->op_private & OPpTRANS_COMPLEMENT;
8ac85365 2003 Delete = o->op_private & OPpTRANS_DELETE;
5d06d08e 2004 squash = o->op_private & OPpTRANS_SQUASH;
79072805
LW		 2005
2006 if (complement) {
2007 Zero(tbl, 256, short);
2008 for (i = 0; i < tlen; i++)
ec49126f 2009 tbl[t[i]] = -1;
79072805
LW		 2010 for (i = 0, j = 0; i < 256; i++) {
2011 if (!tbl[i]) {
2012 if (j >= rlen) {
8ac85365 2013 if (Delete)
79072805
LW		 2014 tbl[i] = -2;
2015 else if (rlen)
ec49126f 2016 tbl[i] = r[j-1];
79072805
LW		 2017 else
2018 tbl[i] = i;
2019 }
2020 else
ec49126f 2021 tbl[i] = r[j++];
79072805
LW		 2022 }
2023 }
2024 }
2025 else {
8ac85365 2026 if (!rlen && !Delete) {
79072805 2027 r = t; rlen = tlen;
5d06d08e
MB		 2028 if (!squash)
2029 o->op_private |= OPpTRANS_COUNTONLY;
79072805
LW		 2030 }
2031 for (i = 0; i < 256; i++)
2032 tbl[i] = -1;
2033 for (i = 0, j = 0; i < tlen; i++,j++) {
2034 if (j >= rlen) {
8ac85365 2035 if (Delete) {
ec49126f 2036 if (tbl[t[i]] == -1)
2037 tbl[t[i]] = -2;
79072805
LW		 2038 continue;
2039 }
2040 --j;
2041 }
ec49126f 2042 if (tbl[t[i]] == -1)
2043 tbl[t[i]] = r[j];
79072805
LW		 2044 }
2045 }
2046 op_free(expr);
2047 op_free(repl);
2048
11343788 2049 return o;
79072805
LW		 2050}
2051
2052OP *
8ac85365 2053newPMOP(I32 type, I32 flags)
79072805 2054{
11343788 2055 dTHR;
79072805
LW		 2056 PMOP *pmop;
2057
2058 Newz(1101, pmop, 1, PMOP);
2059 pmop->op_type = type;
2060 pmop->op_ppaddr = ppaddr[type];
2061 pmop->op_flags = flags;
c07a80fd 2062 pmop->op_private = 0 | (flags >> 8);
79072805 2063
36477c24 2064 if (hints & HINT_LOCALE)
2065 pmop->op_pmpermflags = (pmop->op_pmflags |= PMf_LOCALE);
2066
79072805 2067 /* link into pm list */
a0d0e21e 2068 if (type != OP_TRANS && curstash) {
79072805
LW		 2069 pmop->op_pmnext = HvPMROOT(curstash);
2070 HvPMROOT(curstash) = pmop;
2071 }
2072
2073 return (OP*)pmop;
2074}
2075
2076OP *
8ac85365 2077pmruntime(OP *o, OP *expr, OP *repl)
79072805
LW		 2078{
2079 PMOP *pm;
2080 LOGOP *rcop;
2081
11343788
MB		 2082 if (o->op_type == OP_TRANS)
2083 return pmtrans(o, expr, repl);
79072805 2084
3e3baf6d 2085 hints |= HINT_BLOCK_SCOPE;
11343788 2086 pm = (PMOP*)o;
79072805
LW		 2087
2088 if (expr->op_type == OP_CONST) {
463ee0b2 2089 STRLEN plen;
79072805 2090 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2091 char *p = SvPV(pat, plen);
11343788 2092 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2093 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2094 p = SvPV(pat, plen);
79072805
LW		 2095 pm->op_pmflags |= PMf_SKIPWHITE;
2096 }
e50aee73 2097 pm->op_pmregexp = pregcomp(p, p + plen, pm);
aeea060c 2098 if (strEQ("\\s+", pm->op_pmregexp->precomp))
85e6fe83 2099 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2100 op_free(expr);
2101 }
2102 else {
463ee0b2
LW		 2103 if (pm->op_pmflags & PMf_KEEP)
2104 expr = newUNOP(OP_REGCMAYBE,0,expr);
2105
79072805
LW		 2106 Newz(1101, rcop, 1, LOGOP);
2107 rcop->op_type = OP_REGCOMP;
2108 rcop->op_ppaddr = ppaddr[OP_REGCOMP];
2109 rcop->op_first = scalar(expr);
2110 rcop->op_flags |= OPf_KIDS;
2111 rcop->op_private = 1;
11343788 2112 rcop->op_other = o;
79072805
LW		 2113
2114 /* establish postfix order */
463ee0b2
LW		 2115 if (pm->op_pmflags & PMf_KEEP) {
2116 LINKLIST(expr);
2117 rcop->op_next = expr;
2118 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2119 }
2120 else {
2121 rcop->op_next = LINKLIST(expr);
2122 expr->op_next = (OP*)rcop;
2123 }
79072805 2124
11343788 2125 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2126 }
2127
2128 if (repl) {
748a9306
LW		 2129 OP *curop;
2130 if (pm->op_pmflags & PMf_EVAL)
2131 curop = 0;
554b3eca 2132#ifdef USE_THREADS
2faa37cc 2133 else if (repl->op_type == OP_THREADSV
554b3eca 2134 && strchr("&`'123456789+",
54b9620d 2135 threadsv_names[repl->op_targ]))
554b3eca
MB		 2136 {
2137 curop = 0;
2138 }
2139#endif /* USE_THREADS */
748a9306
LW		 2140 else if (repl->op_type == OP_CONST)
2141 curop = repl;
79072805 2142 else {
79072805
LW		 2143 OP *lastop = 0;
2144 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
2145 if (opargs[curop->op_type] & OA_DANGEROUS) {
554b3eca 2146#ifdef USE_THREADS
2faa37cc 2147 if (curop->op_type == OP_THREADSV
554b3eca
MB		 2148 && strchr("&`'123456789+", curop->op_private)) {
2149 break;
2150 }
2151#else
79072805
LW		 2152 if (curop->op_type == OP_GV) {
2153 GV *gv = ((GVOP*)curop)->op_gv;
93a17b20 2154 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 2155 break;
2156 }
554b3eca 2157#endif /* USE_THREADS */
79072805
LW		 2158 else if (curop->op_type == OP_RV2CV)
2159 break;
2160 else if (curop->op_type == OP_RV2SV ||
2161 curop->op_type == OP_RV2AV ||
2162 curop->op_type == OP_RV2HV ||
2163 curop->op_type == OP_RV2GV) {
2164 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2165 break;
2166 }
748a9306
LW		 2167 else if (curop->op_type == OP_PADSV ||
2168 curop->op_type == OP_PADAV ||
2169 curop->op_type == OP_PADHV ||
554b3eca 2170 curop->op_type == OP_PADANY) {
748a9306
LW		 2171 /* is okay */
2172 }
79072805
LW		 2173 else
2174 break;
2175 }
2176 lastop = curop;
2177 }
748a9306
LW		 2178 }
2179 if (curop == repl) {
2180 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2181 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2182 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2183 }
2184 else {
2185 Newz(1101, rcop, 1, LOGOP);
2186 rcop->op_type = OP_SUBSTCONT;
2187 rcop->op_ppaddr = ppaddr[OP_SUBSTCONT];
2188 rcop->op_first = scalar(repl);
2189 rcop->op_flags |= OPf_KIDS;
2190 rcop->op_private = 1;
11343788 2191 rcop->op_other = o;
748a9306
LW		 2192
2193 /* establish postfix order */
2194 rcop->op_next = LINKLIST(repl);
2195 repl->op_next = (OP*)rcop;
2196
2197 pm->op_pmreplroot = scalar((OP*)rcop);
2198 pm->op_pmreplstart = LINKLIST(rcop);
2199 rcop->op_next = 0;
79072805
LW		 2200 }
2201 }
2202
2203 return (OP*)pm;
2204}
2205
2206OP *
8ac85365 2207newSVOP(I32 type, I32 flags, SV *sv)
79072805
LW		 2208{
2209 SVOP *svop;
2210 Newz(1101, svop, 1, SVOP);
2211 svop->op_type = type;
2212 svop->op_ppaddr = ppaddr[type];
2213 svop->op_sv = sv;
2214 svop->op_next = (OP*)svop;
2215 svop->op_flags = flags;
2216 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2217 scalar((OP*)svop);
79072805 2218 if (opargs[type] & OA_TARGET)
ed6116ce 2219 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2220 return CHECKOP(type, svop);
79072805
LW		 2221}
2222
2223OP *
8ac85365 2224newGVOP(I32 type, I32 flags, GV *gv)
79072805 2225{
11343788 2226 dTHR;
79072805
LW		 2227 GVOP *gvop;
2228 Newz(1101, gvop, 1, GVOP);
2229 gvop->op_type = type;
2230 gvop->op_ppaddr = ppaddr[type];
8990e307 2231 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2232 gvop->op_next = (OP*)gvop;
2233 gvop->op_flags = flags;
2234 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2235 scalar((OP*)gvop);
79072805 2236 if (opargs[type] & OA_TARGET)
ed6116ce 2237 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2238 return CHECKOP(type, gvop);
79072805
LW		 2239}
2240
2241OP *
8ac85365 2242newPVOP(I32 type, I32 flags, char *pv)
79072805
LW		 2243{
2244 PVOP *pvop;
2245 Newz(1101, pvop, 1, PVOP);
2246 pvop->op_type = type;
2247 pvop->op_ppaddr = ppaddr[type];
2248 pvop->op_pv = pv;
2249 pvop->op_next = (OP*)pvop;
2250 pvop->op_flags = flags;
2251 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2252 scalar((OP*)pvop);
79072805 2253 if (opargs[type] & OA_TARGET)
ed6116ce 2254 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2255 return CHECKOP(type, pvop);
79072805
LW		 2256}
2257
79072805 2258void
8ac85365 2259package(OP *o)
79072805 2260{
11343788 2261 dTHR;
93a17b20 2262 SV *sv;
79072805
LW		 2263
2264 save_hptr(&curstash);
2265 save_item(curstname);
11343788 2266 if (o) {
463ee0b2
LW		 2267 STRLEN len;
2268 char *name;
11343788 2269 sv = cSVOPo->op_sv;
463ee0b2 2270 name = SvPV(sv, len);
b1cb66bf 2271 curstash = gv_stashpvn(name,len,TRUE);
463ee0b2 2272 sv_setpvn(curstname, name, len);
11343788 2273 op_free(o);
93a17b20
LW		 2274 }
2275 else {
2276 sv_setpv(curstname,"<none>");
2277 curstash = Nullhv;
2278 }
79072805 2279 copline = NOLINE;
8990e307 2280 expect = XSTATE;
79072805
LW		 2281}
2282
85e6fe83 2283void
8ac85365 2284utilize(int aver, I32 floor, OP *version, OP *id, OP *arg)
85e6fe83 2285{
a0d0e21e
LW		 2286 OP *pack;
2287 OP *meth;
2288 OP *rqop;
2289 OP *imop;
b1cb66bf 2290 OP *veop;
85e6fe83 2291
a0d0e21e
LW		 2292 if (id->op_type != OP_CONST)
2293 croak("Module name must be constant");
85e6fe83 2294
b1cb66bf 2295 veop = Nullop;
2296
2297 if(version != Nullop) {
2298 SV *vesv = ((SVOP*)version)->op_sv;
2299
2300 if (arg == Nullop && !SvNIOK(vesv)) {
2301 arg = version;
2302 }
2303 else {
2304 OP *pack;
2305 OP *meth;
2306
2307 if (version->op_type != OP_CONST || !SvNIOK(vesv))
2308 croak("Version number must be constant number");
2309
2310 /* Make copy of id so we don't free it twice */
2311 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2312
2313 /* Fake up a method call to VERSION */
2314 meth = newSVOP(OP_CONST, 0, newSVpv("VERSION", 7));
2315 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2316 append_elem(OP_LIST,
2317 prepend_elem(OP_LIST, pack, list(version)),
2318 newUNOP(OP_METHOD, 0, meth)));
2319 }
2320 }
aeea060c 2321
a0d0e21e 2322 /* Fake up an import/unimport */
4633a7c4
LW		 2323 if (arg && arg->op_type == OP_STUB)
2324 imop = arg; /* no import on explicit () */
b1cb66bf 2325 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2326 imop = Nullop; /* use 5.0; */
2327 }
4633a7c4
LW		 2328 else {
2329 /* Make copy of id so we don't free it twice */
2330 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4
LW		 2331 meth = newSVOP(OP_CONST, 0,
2332 aver
2333 ? newSVpv("import", 6)
2334 : newSVpv("unimport", 8)
2335 );
2336 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2337 append_elem(OP_LIST,
2338 prepend_elem(OP_LIST, pack, list(arg)),
2339 newUNOP(OP_METHOD, 0, meth)));
4633a7c4
LW		 2340 }
2341
2342 /* Fake up a require */
2343 rqop = newUNOP(OP_REQUIRE, 0, id);
a0d0e21e
LW		 2344
2345 /* Fake up the BEGIN {}, which does its thing immediately. */
c07a80fd 2346 newSUB(floor,
a0d0e21e 2347 newSVOP(OP_CONST, 0, newSVpv("BEGIN", 5)),
4633a7c4 2348 Nullop,
a0d0e21e 2349 append_elem(OP_LINESEQ,
b1cb66bf 2350 append_elem(OP_LINESEQ,
2351 newSTATEOP(0, Nullch, rqop),
2352 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2353 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2354
85e6fe83
LW		 2355 copline = NOLINE;
2356 expect = XSTATE;
2357}
2358
79072805 2359OP *
8ac85365 2360newSLICEOP(I32 flags, OP *subscript, OP *listval)
79072805
LW		 2361{
2362 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 2363 list(force_list(subscript)),
2364 list(force_list(listval)) );
79072805
LW		 2365}
2366
2367static I32
8ac85365 2368list_assignment(register OP *o)
79072805 2369{
11343788 2370 if (!o)
79072805
LW		 2371 return TRUE;
2372
11343788
MB		 2373 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
2374 o = cUNOPo->op_first;
79072805 2375
11343788
MB		 2376 if (o->op_type == OP_COND_EXPR) {
2377 I32 t = list_assignment(cCONDOPo->op_first->op_sibling);
2378 I32 f = list_assignment(cCONDOPo->op_first->op_sibling->op_sibling);
79072805
LW		 2379
2380 if (t && f)
2381 return TRUE;
2382 if (t || f)
2383 yyerror("Assignment to both a list and a scalar");
2384 return FALSE;
2385 }
2386
11343788
MB		 2387 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
2388 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
2389 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 2390 return TRUE;
2391
11343788 2392 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 2393 return TRUE;
2394
11343788 2395 if (o->op_type == OP_RV2SV)
79072805
LW		 2396 return FALSE;
2397
2398 return FALSE;
2399}
2400
2401OP *
8ac85365 2402newASSIGNOP(I32 flags, OP *left, I32 optype, OP *right)
79072805 2403{
11343788 2404 OP *o;
79072805 2405
a0d0e21e
LW		 2406 if (optype) {
2407 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
2408 return newLOGOP(optype, 0,
2409 mod(scalar(left), optype),
2410 newUNOP(OP_SASSIGN, 0, scalar(right)));
2411 }
2412 else {
2413 return newBINOP(optype, OPf_STACKED,
2414 mod(scalar(left), optype), scalar(right));
2415 }
2416 }
2417
79072805 2418 if (list_assignment(left)) {
463ee0b2 2419 modcount = 0;
748a9306 2420 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 2421 left = mod(left, OP_AASSIGN);
748a9306
LW		 2422 if (eval_start)
2423 eval_start = 0;
2424 else {
a0d0e21e
LW		 2425 op_free(left);
2426 op_free(right);
2427 return Nullop;
2428 }
11343788 2429 o = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 2430 list(force_list(right)),
2431 list(force_list(left)) );
11343788 2432 o->op_private = 0 | (flags >> 8);
a0d0e21e 2433 if (!(left->op_private & OPpLVAL_INTRO)) {
748a9306 2434 static int generation = 100;
79072805 2435 OP *curop;
11343788 2436 OP *lastop = o;
79072805 2437 generation++;
11343788 2438 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
79072805
LW		 2439 if (opargs[curop->op_type] & OA_DANGEROUS) {
2440 if (curop->op_type == OP_GV) {
2441 GV *gv = ((GVOP*)curop)->op_gv;
2442 if (gv == defgv || SvCUR(gv) == generation)
2443 break;
2444 SvCUR(gv) = generation;
2445 }
748a9306
LW		 2446 else if (curop->op_type == OP_PADSV ||
2447 curop->op_type == OP_PADAV ||
2448 curop->op_type == OP_PADHV ||
2449 curop->op_type == OP_PADANY) {
2450 SV **svp = AvARRAY(comppad_name);
8e07c86e 2451 SV *sv = svp[curop->op_targ];
748a9306
LW		 2452 if (SvCUR(sv) == generation)
2453 break;
2454 SvCUR(sv) = generation; /* (SvCUR not used any more) */
2455 }
79072805
LW		 2456 else if (curop->op_type == OP_RV2CV)
2457 break;
2458 else if (curop->op_type == OP_RV2SV ||
2459 curop->op_type == OP_RV2AV ||
2460 curop->op_type == OP_RV2HV ||
2461 curop->op_type == OP_RV2GV) {
2462 if (lastop->op_type != OP_GV) /* funny deref? */
2463 break;
2464 }
2465 else
2466 break;
2467 }
2468 lastop = curop;
2469 }
11343788
MB		 2470 if (curop != o)
2471 o->op_private = OPpASSIGN_COMMON;
79072805 2472 }
c07a80fd 2473 if (right && right->op_type == OP_SPLIT) {
2474 OP* tmpop;
2475 if ((tmpop = ((LISTOP*)right)->op_first) &&
2476 tmpop->op_type == OP_PUSHRE)
2477 {
2478 PMOP *pm = (PMOP*)tmpop;
2479 if (left->op_type == OP_RV2AV &&
2480 !(left->op_private & OPpLVAL_INTRO) &&
11343788 2481 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 2482 {
2483 tmpop = ((UNOP*)left)->op_first;
2484 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
2485 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
2486 pm->op_pmflags |= PMf_ONCE;
11343788 2487 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 2488 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
2489 tmpop->op_sibling = Nullop; /* don't free split */
2490 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 2491 op_free(o); /* blow off assign */
54310121 2492 right->op_flags &= ~OPf_WANT;
a5f75d66 2493 /* "I don't know and I don't care." */
c07a80fd 2494 return right;
2495 }
2496 }
2497 else {
2498 if (modcount < 10000 &&
2499 ((LISTOP*)right)->op_last->op_type == OP_CONST)
2500 {
2501 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
2502 if (SvIVX(sv) == 0)
2503 sv_setiv(sv, modcount+1);
2504 }
2505 }
2506 }
2507 }
11343788 2508 return o;
79072805
LW		 2509 }
2510 if (!right)
2511 right = newOP(OP_UNDEF, 0);
2512 if (right->op_type == OP_READLINE) {
2513 right->op_flags |= OPf_STACKED;
463ee0b2 2514 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 2515 }
a0d0e21e 2516 else {
748a9306 2517 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 2518 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 2519 scalar(right), mod(scalar(left), OP_SASSIGN) );
748a9306
LW		 2520 if (eval_start)
2521 eval_start = 0;
2522 else {
11343788 2523 op_free(o);
a0d0e21e
LW		 2524 return Nullop;
2525 }
2526 }
11343788 2527 return o;
79072805
LW		 2528}
2529
2530OP *
8ac85365 2531newSTATEOP(I32 flags, char *label, OP *o)
79072805 2532{
11343788 2533 dTHR;
bbce6d69 2534 U32 seq = intro_my();
79072805
LW		 2535 register COP *cop;
2536
2537 Newz(1101, cop, 1, COP);
84902520 2538 if (PERLDB_LINE && curcop->cop_line && curstash != debstash) {
8990e307
LW		 2539 cop->op_type = OP_DBSTATE;
2540 cop->op_ppaddr = ppaddr[ OP_DBSTATE ];
2541 }
2542 else {
2543 cop->op_type = OP_NEXTSTATE;
2544 cop->op_ppaddr = ppaddr[ OP_NEXTSTATE ];
2545 }
79072805 2546 cop->op_flags = flags;
c07a80fd 2547 cop->op_private = 0 | (flags >> 8);
ff0cee69 2548#ifdef NATIVE_HINTS
2549 cop->op_private |= NATIVE_HINTS;
2550#endif
79072805
LW		 2551 cop->op_next = (OP*)cop;
2552
463ee0b2
LW		 2553 if (label) {
2554 cop->cop_label = label;
85e6fe83 2555 hints |= HINT_BLOCK_SCOPE;
463ee0b2 2556 }
bbce6d69 2557 cop->cop_seq = seq;
a0d0e21e 2558 cop->cop_arybase = curcop->cop_arybase;
79072805
LW		 2559
2560 if (copline == NOLINE)
2561 cop->cop_line = curcop->cop_line;
2562 else {
2563 cop->cop_line = copline;
2564 copline = NOLINE;
2565 }
44a8e56a 2566 cop->cop_filegv = (GV*)SvREFCNT_inc(curcop->cop_filegv);
79072805
LW		 2567 cop->cop_stash = curstash;
2568
84902520 2569 if (PERLDB_LINE && curstash != debstash) {
93a17b20
LW		 2570 SV **svp = av_fetch(GvAV(curcop->cop_filegv),(I32)cop->cop_line, FALSE);
2571 if (svp && *svp != &sv_undef && !SvIOK(*svp)) {
a0d0e21e 2572 (void)SvIOK_on(*svp);
a5f75d66 2573 SvIVX(*svp) = 1;
93a17b20
LW		 2574 SvSTASH(*svp) = (HV*)cop;
2575 }
2576 }
2577
11343788 2578 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 2579}
2580
bbce6d69 2581/* "Introduce" my variables to visible status. */
2582U32
8ac85365 2583intro_my(void)
bbce6d69 2584{
2585 SV **svp;
2586 SV *sv;
2587 I32 i;
2588
2589 if (! min_intro_pending)
2590 return cop_seqmax;
2591
2592 svp = AvARRAY(comppad_name);
2593 for (i = min_intro_pending; i <= max_intro_pending; i++) {
2594 if ((sv = svp[i]) && sv != &sv_undef && !SvIVX(sv)) {
2595 SvIVX(sv) = 999999999; /* Don't know scope end yet. */
2596 SvNVX(sv) = (double)cop_seqmax;
2597 }
2598 }
2599 min_intro_pending = 0;
2600 comppad_name_fill = max_intro_pending; /* Needn't search higher */
2601 return cop_seqmax++;
2602}
2603
79072805 2604OP *
8ac85365 2605newLOGOP(I32 type, I32 flags, OP *first, OP *other)
79072805 2606{
11343788 2607 dTHR;
79072805 2608 LOGOP *logop;
11343788 2609 OP *o;
79072805 2610
a0d0e21e
LW		 2611 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
2612 return newBINOP(type, flags, scalar(first), scalar(other));
2613
8990e307 2614 scalarboolean(first);
79072805
LW		 2615 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
2616 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
2617 if (type == OP_AND || type == OP_OR) {
2618 if (type == OP_AND)
2619 type = OP_OR;
2620 else
2621 type = OP_AND;
11343788
MB		 2622 o = first;
2623 first = cUNOPo->op_first;
2624 if (o->op_next)
2625 first->op_next = o->op_next;
2626 cUNOPo->op_first = Nullop;
2627 op_free(o);
79072805
LW		 2628 }
2629 }
2630 if (first->op_type == OP_CONST) {
93a17b20 2631 if (dowarn && (first->op_private & OPpCONST_BARE))
c07a80fd 2632 warn("Probable precedence problem on %s", op_desc[type]);
79072805
LW		 2633 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
2634 op_free(first);
2635 return other;
2636 }
2637 else {
2638 op_free(other);
2639 return first;
2640 }
2641 }
2642 else if (first->op_type == OP_WANTARRAY) {
2643 if (type == OP_AND)
2644 list(other);
2645 else
2646 scalar(other);
2647 }
a6006777 2648 else if (dowarn && (first->op_flags & OPf_KIDS)) {
2649 OP *k1 = ((UNOP*)first)->op_first;
2650 OP *k2 = k1->op_sibling;
2651 OPCODE warnop = 0;
2652 switch (first->op_type)
2653 {
2654 case OP_NULL:
2655 if (k2 && k2->op_type == OP_READLINE
2656 && (k2->op_flags & OPf_STACKED)
2657 && (k1->op_type == OP_RV2SV || k1->op_type == OP_PADSV))
2658 warnop = k2->op_type;
2659 break;
2660
2661 case OP_SASSIGN:
68dc0745 2662 if (k1->op_type == OP_READDIR
2663 || k1->op_type == OP_GLOB
2664 || k1->op_type == OP_EACH)
a6006777 2665 warnop = k1->op_type;
2666 break;
2667 }
8ebc5c01 2668 if (warnop) {
2669 line_t oldline = curcop->cop_line;
2670 curcop->cop_line = copline;
68dc0745 2671 warn("Value of %s%s can be \"0\"; test with defined()",
2672 op_desc[warnop],
2673 ((warnop == OP_READLINE || warnop == OP_GLOB)
2674 ? " construct" : "() operator"));
2675 curcop->cop_line = oldline;
8ebc5c01 2676 }
a6006777 2677 }
79072805
LW		 2678
2679 if (!other)
2680 return first;
2681
a0d0e21e
LW		 2682 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
2683 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
2684
79072805
LW		 2685 Newz(1101, logop, 1, LOGOP);
2686
2687 logop->op_type = type;
2688 logop->op_ppaddr = ppaddr[type];
2689 logop->op_first = first;
2690 logop->op_flags = flags | OPf_KIDS;
2691 logop->op_other = LINKLIST(other);
c07a80fd 2692 logop->op_private = 1 | (flags >> 8);
79072805
LW		 2693
2694 /* establish postfix order */
2695 logop->op_next = LINKLIST(first);
2696 first->op_next = (OP*)logop;
2697 first->op_sibling = other;
2698
11343788
MB		 2699 o = newUNOP(OP_NULL, 0, (OP*)logop);
2700 other->op_next = o;
79072805 2701
11343788 2702 return o;
79072805
LW		 2703}
2704
2705OP *
8ac85365 2706newCONDOP(I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 2707{
11343788 2708 dTHR;
79072805 2709 CONDOP *condop;
11343788 2710 OP *o;
79072805 2711
b1cb66bf 2712 if (!falseop)
2713 return newLOGOP(OP_AND, 0, first, trueop);
2714 if (!trueop)
2715 return newLOGOP(OP_OR, 0, first, falseop);
79072805 2716
8990e307 2717 scalarboolean(first);
79072805
LW		 2718 if (first->op_type == OP_CONST) {
2719 if (SvTRUE(((SVOP*)first)->op_sv)) {
2720 op_free(first);
b1cb66bf 2721 op_free(falseop);
2722 return trueop;
79072805
LW		 2723 }
2724 else {
2725 op_free(first);
b1cb66bf 2726 op_free(trueop);
2727 return falseop;
79072805
LW		 2728 }
2729 }
2730 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 2731 list(trueop);
2732 scalar(falseop);
79072805
LW		 2733 }
2734 Newz(1101, condop, 1, CONDOP);
2735
2736 condop->op_type = OP_COND_EXPR;
2737 condop->op_ppaddr = ppaddr[OP_COND_EXPR];
2738 condop->op_first = first;
2739 condop->op_flags = flags | OPf_KIDS;
b1cb66bf 2740 condop->op_true = LINKLIST(trueop);
2741 condop->op_false = LINKLIST(falseop);
c07a80fd 2742 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2743
2744 /* establish postfix order */
2745 condop->op_next = LINKLIST(first);
2746 first->op_next = (OP*)condop;
2747
b1cb66bf 2748 first->op_sibling = trueop;
2749 trueop->op_sibling = falseop;
11343788 2750 o = newUNOP(OP_NULL, 0, (OP*)condop);
79072805 2751
5dc0d613
MB		 2752 trueop->op_next = o;
2753 falseop->op_next = o;
79072805 2754
11343788 2755 return o;
79072805
LW		 2756}
2757
2758OP *
8ac85365 2759newRANGE(I32 flags, OP *left, OP *right)
79072805 2760{
b35b2403 2761 dTHR;
79072805
LW		 2762 CONDOP *condop;
2763 OP *flip;
2764 OP *flop;
11343788 2765 OP *o;
79072805
LW		 2766
2767 Newz(1101, condop, 1, CONDOP);
2768
2769 condop->op_type = OP_RANGE;
2770 condop->op_ppaddr = ppaddr[OP_RANGE];
2771 condop->op_first = left;
2772 condop->op_flags = OPf_KIDS;
2773 condop->op_true = LINKLIST(left);
2774 condop->op_false = LINKLIST(right);
c07a80fd 2775 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2776
2777 left->op_sibling = right;
2778
2779 condop->op_next = (OP*)condop;
2780 flip = newUNOP(OP_FLIP, flags, (OP*)condop);
2781 flop = newUNOP(OP_FLOP, 0, flip);
11343788 2782 o = newUNOP(OP_NULL, 0, flop);
79072805
LW		 2783 linklist(flop);
2784
2785 left->op_next = flip;
2786 right->op_next = flop;
2787
ed6116ce 2788 condop->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805 2789 sv_upgrade(PAD_SV(condop->op_targ), SVt_PVNV);
ed6116ce 2790 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 2791 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
2792
2793 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2794 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2795
11343788 2796 flip->op_next = o;
79072805 2797 if (!flip->op_private || !flop->op_private)
11343788 2798 linklist(o); /* blow off optimizer unless constant */
79072805 2799
11343788 2800 return o;
79072805
LW		 2801}
2802
2803OP *
8ac85365 2804newLOOPOP(I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 2805{
11343788 2806 dTHR;
463ee0b2 2807 OP* listop;
11343788 2808 OP* o;
463ee0b2 2809 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 2810 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 2811
463ee0b2
LW		 2812 if (expr) {
2813 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
2814 return block; /* do {} while 0 does once */
fb73857a 2815 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
2816 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 2817 expr = newUNOP(OP_DEFINED, 0,
54b9620d 2818 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
774d564b 2819 }
463ee0b2 2820 }
93a17b20 2821
8990e307 2822 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
11343788 2823 o = newLOGOP(OP_AND, 0, expr, listop);
463ee0b2 2824
11343788 2825 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 2826
11343788
MB		 2827 if (once && o != listop)
2828 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 2829
11343788
MB		 2830 if (o == listop)
2831 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 2832
11343788
MB		 2833 o->op_flags |= flags;
2834 o = scope(o);
2835 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
2836 return o;
79072805
LW		 2837}
2838
2839OP *
8ac85365 2840newWHILEOP(I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805 2841{
11343788 2842 dTHR;
79072805
LW		 2843 OP *redo;
2844 OP *next = 0;
2845 OP *listop;
11343788 2846 OP *o;
79072805
LW		 2847 OP *condop;
2848
fb73857a 2849 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
2850 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 2851 expr = newUNOP(OP_DEFINED, 0,
54b9620d 2852 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
748a9306 2853 }
79072805
LW		 2854
2855 if (!block)
2856 block = newOP(OP_NULL, 0);
2857
2858 if (cont)
2859 next = LINKLIST(cont);
fb73857a 2860 if (expr) {
79072805 2861 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
fb73857a 2862 if ((line_t)whileline != NOLINE) {
2863 copline = whileline;
2864 cont = append_elem(OP_LINESEQ, cont,
2865 newSTATEOP(0, Nullch, Nullop));
2866 }
2867 }
79072805 2868
463ee0b2 2869 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 2870 redo = LINKLIST(listop);
2871
2872 if (expr) {
11343788
MB		 2873 o = newLOGOP(OP_AND, 0, expr, scalar(listop));
2874 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 2875 op_free(expr); /* oops, it's a while (0) */
463ee0b2
LW		 2876 op_free((OP*)loop);
2877 return Nullop; /* (listop already freed by newLOGOP) */
2878 }
aeea060c 2879 ((LISTOP*)listop)->op_last->op_next = condop =
11343788 2880 (o == listop ? redo : LINKLIST(o));
79072805
LW		 2881 if (!next)
2882 next = condop;
2883 }
2884 else
11343788 2885 o = listop;
79072805
LW		 2886
2887 if (!loop) {
2888 Newz(1101,loop,1,LOOP);
2889 loop->op_type = OP_ENTERLOOP;
2890 loop->op_ppaddr = ppaddr[OP_ENTERLOOP];
2891 loop->op_private = 0;
2892 loop->op_next = (OP*)loop;
2893 }
2894
11343788 2895 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 2896
2897 loop->op_redoop = redo;
11343788 2898 loop->op_lastop = o;
79072805
LW		 2899
2900 if (next)
2901 loop->op_nextop = next;
2902 else
11343788 2903 loop->op_nextop = o;
79072805 2904
11343788
MB		 2905 o->op_flags |= flags;
2906 o->op_private |= (flags >> 8);
2907 return o;
79072805
LW		 2908}
2909
2910OP *
a0d0e21e 2911#ifndef CAN_PROTOTYPE
79072805
LW		 2912newFOROP(flags,label,forline,sv,expr,block,cont)
2913I32 flags;
2914char *label;
2915line_t forline;
2916OP* sv;
2917OP* expr;
2918OP*block;
2919OP*cont;
8990e307
LW		 2920#else
2921newFOROP(I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
a0d0e21e 2922#endif /* CAN_PROTOTYPE */
79072805
LW		 2923{
2924 LOOP *loop;
fb73857a 2925 OP *wop;
85e6fe83 2926 int padoff = 0;
4633a7c4 2927 I32 iterflags = 0;
79072805 2928
79072805 2929 if (sv) {
85e6fe83 2930 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306
LW		 2931 sv->op_type = OP_RV2GV;
2932 sv->op_ppaddr = ppaddr[OP_RV2GV];
79072805 2933 }
85e6fe83
LW		 2934 else if (sv->op_type == OP_PADSV) { /* private variable */
2935 padoff = sv->op_targ;
2936 op_free(sv);
2937 sv = Nullop;
2938 }
54b9620d
MB		 2939 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
2940 padoff = sv->op_targ;
2941 iterflags |= OPf_SPECIAL;
2942 op_free(sv);
2943 sv = Nullop;
2944 }
79072805 2945 else
c07a80fd 2946 croak("Can't use %s for loop variable", op_desc[sv->op_type]);
79072805
LW		 2947 }
2948 else {
54b9620d
MB		 2949#ifdef USE_THREADS
2950 padoff = find_threadsv("_");
2951 iterflags |= OPf_SPECIAL;
2952#else
79072805 2953 sv = newGVOP(OP_GV, 0, defgv);
54b9620d 2954#endif
79072805 2955 }
5f05dabc 2956 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
4633a7c4
LW		 2957 expr = scalar(ref(expr, OP_ITER));
2958 iterflags |= OPf_STACKED;
2959 }
2960 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
a0d0e21e
LW		 2961 append_elem(OP_LIST, mod(force_list(expr), OP_GREPSTART),
2962 scalar(sv))));
85e6fe83
LW		 2963 assert(!loop->op_next);
2964 Renew(loop, 1, LOOP);
2965 loop->op_targ = padoff;
fb73857a 2966 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont);
2967 copline = forline;
2968 return newSTATEOP(0, label, wop);
79072805
LW		 2969}
2970
8990e307 2971OP*
8ac85365 2972newLOOPEX(I32 type, OP *label)
8990e307 2973{
11343788
MB		 2974 dTHR;
2975 OP *o;
8990e307 2976 if (type != OP_GOTO || label->op_type == OP_CONST) {
11343788 2977 o = newPVOP(type, 0, savepv(
a0d0e21e
LW		 2978 label->op_type == OP_CONST
2979 ? SvPVx(((SVOP*)label)->op_sv, na)
2980 : "" ));
8990e307
LW		 2981 op_free(label);
2982 }
2983 else {
a0d0e21e
LW		 2984 if (label->op_type == OP_ENTERSUB)
2985 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 2986 o = newUNOP(type, OPf_STACKED, label);
8990e307 2987 }
85e6fe83 2988 hints |= HINT_BLOCK_SCOPE;
11343788 2989 return o;
8990e307
LW		 2990}
2991
79072805 2992void
8ac85365 2993cv_undef(CV *cv)
79072805 2994{
11343788
MB		 2995 dTHR;
2996#ifdef USE_THREADS
e858de61
MB		 2997 if (CvMUTEXP(cv)) {
2998 MUTEX_DESTROY(CvMUTEXP(cv));
2999 Safefree(CvMUTEXP(cv));
3000 CvMUTEXP(cv) = 0;
3001 }
11343788
MB		 3002#endif /* USE_THREADS */
3003
a0d0e21e 3004 if (!CvXSUB(cv) && CvROOT(cv)) {
11343788
MB		 3005#ifdef USE_THREADS
3006 if (CvDEPTH(cv) || (CvOWNER(cv) && CvOWNER(cv) != thr))
3007 croak("Can't undef active subroutine");
3008#else
a0d0e21e
LW		 3009 if (CvDEPTH(cv))
3010 croak("Can't undef active subroutine");
11343788 3011#endif /* USE_THREADS */
8990e307 3012 ENTER;
a0d0e21e
LW		 3013
3014 SAVESPTR(curpad);
3015 curpad = 0;
3016
a5f75d66 3017 if (!CvCLONED(cv))
748a9306 3018 op_free(CvROOT(cv));
79072805 3019 CvROOT(cv) = Nullop;
8990e307 3020 LEAVE;
79072805 3021 }
1d5db326 3022 SvPOK_off((SV*)cv); /* forget prototype */
44a8e56a 3023 CvFLAGS(cv) = 0;
8e07c86e
AD		 3024 SvREFCNT_dec(CvGV(cv));
3025 CvGV(cv) = Nullgv;
3026 SvREFCNT_dec(CvOUTSIDE(cv));
3027 CvOUTSIDE(cv) = Nullcv;
3028 if (CvPADLIST(cv)) {
8ebc5c01 3029 /* may be during global destruction */
3030 if (SvREFCNT(CvPADLIST(cv))) {
93965878 3031 I32 i = AvFILLp(CvPADLIST(cv));
8ebc5c01 3032 while (i >= 0) {
3033 SV** svp = av_fetch(CvPADLIST(cv), i--, FALSE);
46fc3d4c 3034 SV* sv = svp ? *svp : Nullsv;
3035 if (!sv)
3036 continue;
3037 if (sv == (SV*)comppad_name)
3038 comppad_name = Nullav;
3039 else if (sv == (SV*)comppad) {
3040 comppad = Nullav;
3041 curpad = Null(SV**);
3042 }
3043 SvREFCNT_dec(sv);
8ebc5c01 3044 }
3045 SvREFCNT_dec((SV*)CvPADLIST(cv));
8e07c86e 3046 }
8e07c86e
AD		 3047 CvPADLIST(cv) = Nullav;
3048 }
79072805
LW		 3049}
3050
5f05dabc 3051#ifdef DEBUG_CLOSURES
3052static void
3053cv_dump(cv)
3054CV* cv;
3055{
3056 CV *outside = CvOUTSIDE(cv);
3057 AV* padlist = CvPADLIST(cv);
4fdae800 3058 AV* pad_name;
3059 AV* pad;
3060 SV** pname;
3061 SV** ppad;
5f05dabc 3062 I32 ix;
3063
fb73857a 3064 PerlIO_printf(Perl_debug_log, "\tCV=0x%lx (%s), OUTSIDE=0x%lx (%s)\n",
ab50184a
CS		 3065 cv,
3066 (CvANON(cv) ? "ANON"
3067 : (cv == main_cv) ? "MAIN"
07055b4c 3068 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3069 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
ab50184a
CS		 3070 outside,
3071 (!outside ? "null"
3072 : CvANON(outside) ? "ANON"
3073 : (outside == main_cv) ? "MAIN"
07055b4c 3074 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3075 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
5f05dabc 3076
4fdae800 3077 if (!padlist)
3078 return;
3079
3080 pad_name = (AV*)*av_fetch(padlist, 0, FALSE);
3081 pad = (AV*)*av_fetch(padlist, 1, FALSE);
3082 pname = AvARRAY(pad_name);
3083 ppad = AvARRAY(pad);
3084
93965878 3085 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
5f05dabc 3086 if (SvPOK(pname[ix]))
fb73857a 3087 PerlIO_printf(Perl_debug_log, "\t%4d. 0x%lx (%s\"%s\" %ld-%ld)\n",
4fdae800 3088 ix, ppad[ix],
3089 SvFAKE(pname[ix]) ? "FAKE " : "",
3090 SvPVX(pname[ix]),
ab50184a
CS		 3091 (long)I_32(SvNVX(pname[ix])),
3092 (long)SvIVX(pname[ix]));
5f05dabc 3093 }
3094}
3095#endif /* DEBUG_CLOSURES */
3096
3097static CV *
8ac85365 3098cv_clone2(CV *proto, CV *outside)
748a9306 3099{
11343788 3100 dTHR;
748a9306
LW		 3101 AV* av;
3102 I32 ix;
3103 AV* protopadlist = CvPADLIST(proto);
3104 AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
3105 AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
5f05dabc 3106 SV** pname = AvARRAY(protopad_name);
3107 SV** ppad = AvARRAY(protopad);
93965878
NIS		 3108 I32 fname = AvFILLp(protopad_name);
3109 I32 fpad = AvFILLp(protopad);
748a9306
LW		 3110 AV* comppadlist;
3111 CV* cv;
3112
07055b4c
CS		 3113 assert(!CvUNIQUE(proto));
3114
748a9306
LW		 3115 ENTER;
3116 SAVESPTR(curpad);
3117 SAVESPTR(comppad);
46fc3d4c 3118 SAVESPTR(comppad_name);
748a9306
LW		 3119 SAVESPTR(compcv);
3120
3121 cv = compcv = (CV*)NEWSV(1104,0);
fa83b5b6 3122 sv_upgrade((SV *)cv, SvTYPE(proto));
a5f75d66 3123 CvCLONED_on(cv);
5f05dabc 3124 if (CvANON(proto))
3125 CvANON_on(cv);
748a9306 3126
11343788 3127#ifdef USE_THREADS
12ca11f6 3128 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3129 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3130 CvOWNER(cv) = 0;
3131#endif /* USE_THREADS */
748a9306 3132 CvFILEGV(cv) = CvFILEGV(proto);
44a8e56a 3133 CvGV(cv) = (GV*)SvREFCNT_inc(CvGV(proto));
748a9306
LW		 3134 CvSTASH(cv) = CvSTASH(proto);
3135 CvROOT(cv) = CvROOT(proto);
3136 CvSTART(cv) = CvSTART(proto);
5f05dabc 3137 if (outside)
3138 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
748a9306 3139
68dc0745 3140 if (SvPOK(proto))
3141 sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto));
3142
46fc3d4c 3143 comppad_name = newAV();
3144 for (ix = fname; ix >= 0; ix--)
3145 av_store(comppad_name, ix, SvREFCNT_inc(pname[ix]));
748a9306
LW		 3146
3147 comppad = newAV();
3148
3149 comppadlist = newAV();
3150 AvREAL_off(comppadlist);
46fc3d4c 3151 av_store(comppadlist, 0, (SV*)comppad_name);
b355b4e0 3152 av_store(comppadlist, 1, (SV*)comppad);
748a9306 3153 CvPADLIST(cv) = comppadlist;
93965878 3154 av_fill(comppad, AvFILLp(protopad));
748a9306
LW		 3155 curpad = AvARRAY(comppad);
3156
3157 av = newAV(); /* will be @_ */
3158 av_extend(av, 0);
3159 av_store(comppad, 0, (SV*)av);
3160 AvFLAGS(av) = AVf_REIFY;
3161
9607fc9c 3162 for (ix = fpad; ix > 0; ix--) {
3163 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3164 if (namesv && namesv != &sv_undef) {
3165 char *name = SvPVX(namesv); /* XXX */
3166 if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */
3167 I32 off = pad_findlex(name, ix, SvIVX(namesv),
5f05dabc 3168 CvOUTSIDE(cv), cxstack_ix);
3169 if (!off)
3170 curpad[ix] = SvREFCNT_inc(ppad[ix]);
3171 else if (off != ix)
748a9306
LW		 3172 croak("panic: cv_clone: %s", name);
3173 }
3174 else { /* our own lexical */
aa689395 3175 SV* sv;
5f05dabc 3176 if (*name == '&') {
3177 /* anon code -- we'll come back for it */
3178 sv = SvREFCNT_inc(ppad[ix]);
3179 }
3180 else if (*name == '@')
3181 sv = (SV*)newAV();
748a9306 3182 else if (*name == '%')
5f05dabc 3183 sv = (SV*)newHV();
748a9306 3184 else
5f05dabc 3185 sv = NEWSV(0,0);
3186 if (!SvPADBUSY(sv))
3187 SvPADMY_on(sv);
3188 curpad[ix] = sv;
748a9306
LW		 3189 }
3190 }
3191 else {
aa689395 3192 SV* sv = NEWSV(0,0);
748a9306 3193 SvPADTMP_on(sv);
5f05dabc 3194 curpad[ix] = sv;
748a9306
LW		 3195 }
3196 }
3197
5f05dabc 3198 /* Now that vars are all in place, clone nested closures. */
3199
9607fc9c 3200 for (ix = fpad; ix > 0; ix--) {
3201 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3202 if (namesv
3203 && namesv != &sv_undef
3204 && !(SvFLAGS(namesv) & SVf_FAKE)
3205 && *SvPVX(namesv) == '&'
5f05dabc 3206 && CvCLONE(ppad[ix]))
3207 {
3208 CV *kid = cv_clone2((CV*)ppad[ix], cv);
3209 SvREFCNT_dec(ppad[ix]);
3210 CvCLONE_on(kid);
3211 SvPADMY_on(kid);
3212 curpad[ix] = (SV*)kid;
748a9306
LW		 3213 }
3214 }
3215
5f05dabc 3216#ifdef DEBUG_CLOSURES
ab50184a
CS		 3217 PerlIO_printf(Perl_debug_log, "Cloned inside:\n");
3218 cv_dump(outside);
3219 PerlIO_printf(Perl_debug_log, " from:\n");
5f05dabc 3220 cv_dump(proto);
ab50184a 3221 PerlIO_printf(Perl_debug_log, " to:\n");
5f05dabc 3222 cv_dump(cv);
3223#endif
3224
748a9306
LW		 3225 LEAVE;
3226 return cv;
3227}
3228
3229CV *
8ac85365 3230cv_clone(CV *proto)
5f05dabc 3231{
3232 return cv_clone2(proto, CvOUTSIDE(proto));
3233}
3234
3fe9a6f1 3235void
8ac85365 3236cv_ckproto(CV *cv, GV *gv, char *p)
3fe9a6f1 3237{
3238 if ((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX(cv)))) {
46fc3d4c 3239 SV* msg = sv_newmortal();
3fe9a6f1 3240 SV* name = Nullsv;
3241
3242 if (gv)
46fc3d4c 3243 gv_efullname3(name = sv_newmortal(), gv, Nullch);
3244 sv_setpv(msg, "Prototype mismatch:");
3245 if (name)
fc36a67e 3246 sv_catpvf(msg, " sub %_", name);
3fe9a6f1 3247 if (SvPOK(cv))
46fc3d4c 3248 sv_catpvf(msg, " (%s)", SvPVX(cv));
3249 sv_catpv(msg, " vs ");
3250 if (p)
3251 sv_catpvf(msg, "(%s)", p);
3252 else
3253 sv_catpv(msg, "none");
fc36a67e 3254 warn("%_", msg);
3fe9a6f1 3255 }
3256}
3257
760ac839 3258SV *
8ac85365 3259cv_const_sv(CV *cv)
760ac839
LW		 3260{
3261 OP *o;
54310121 3262 SV *sv;
aeea060c 3263
54310121 3264 if (!cv || !SvPOK(cv) || SvCUR(cv))
3265 return Nullsv;
760ac839 3266
54310121 3267 sv = Nullsv;
3268 for (o = CvSTART(cv); o; o = o->op_next) {
3269 OPCODE type = o->op_type;
3270
3271 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
3272 continue;
3273 if (type == OP_LEAVESUB || type == OP_RETURN)
3274 break;
3275 if (sv)
3276 return Nullsv;
3277 if (type == OP_CONST)
5dc0d613 3278 sv = cSVOPo->op_sv;
54310121 3279 else if (type == OP_PADSV) {
e858de61
MB		 3280 AV* padav = (AV*)(AvARRAY(CvPADLIST(cv))[1]);
3281 sv = padav ? AvARRAY(padav)[o->op_targ] : Nullsv;
5aabfad6 3282 if (!sv || (!SvREADONLY(sv) && SvREFCNT(sv) > 1))
54310121 3283 return Nullsv;
760ac839 3284 }
54310121 3285 else
3286 return Nullsv;
760ac839 3287 }
5aabfad6 3288 if (sv)
3289 SvREADONLY_on(sv);
760ac839
LW		 3290 return sv;
3291}
3292
748a9306 3293CV *
8ac85365 3294newSUB(I32 floor, OP *o, OP *proto, OP *block)
79072805 3295{
11343788 3296 dTHR;
5dc0d613 3297 char *name = o ? SvPVx(cSVOPo->op_sv, na) : Nullch;
44a8e56a 3298 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
3fe9a6f1 3299 char *ps = proto ? SvPVx(((SVOP*)proto)->op_sv, na) : Nullch;
79072805 3300 register CV *cv;
a0d0e21e 3301 I32 ix;
79072805 3302
11343788 3303 if (o)
5dc0d613 3304 SAVEFREEOP(o);
3fe9a6f1 3305 if (proto)
3306 SAVEFREEOP(proto);
3307
68dc0745 3308 if (!name || GvCVGEN(gv))
3309 cv = Nullcv;
3310 else if (cv = GvCV(gv)) {
3fe9a6f1 3311 cv_ckproto(cv, gv, ps);
68dc0745 3312 /* already defined (or promised)? */
3313 if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3314 SV* const_sv;
aa689395 3315 if (!block) {
3316 /* just a "sub foo;" when &foo is already defined */
3317 SAVEFREESV(compcv);
3318 goto done;
3319 }
7bac28a0 3320 /* ahem, death to those who redefine active sort subs */
3321 if (curstack == sortstack && sortcop == CvSTART(cv))
3322 croak("Can't redefine active sort subroutine %s", name);
68dc0745 3323 const_sv = cv_const_sv(cv);
44a8e56a 3324 if (const_sv || dowarn) {
79072805 3325 line_t oldline = curcop->cop_line;
79072805 3326 curcop->cop_line = copline;
760ac839 3327 warn(const_sv ? "Constant subroutine %s redefined"
68dc0745 3328 : "Subroutine %s redefined", name);
79072805
LW		 3329 curcop->cop_line = oldline;
3330 }
8990e307 3331 SvREFCNT_dec(cv);
68dc0745 3332 cv = Nullcv;
79072805
LW		 3333 }
3334 }
a0d0e21e 3335 if (cv) { /* must reuse cv if autoloaded */
4633a7c4 3336 cv_undef(cv);
44a8e56a 3337 CvFLAGS(cv) = CvFLAGS(compcv);
748a9306 3338 CvOUTSIDE(cv) = CvOUTSIDE(compcv);
e9a444f0 3339 CvOUTSIDE(compcv) = 0;
748a9306 3340 CvPADLIST(cv) = CvPADLIST(compcv);
4aa0a1f7 3341 CvPADLIST(compcv) = 0;
4633a7c4
LW		 3342 if (SvREFCNT(compcv) > 1) /* XXX Make closures transit through stub. */
3343 CvOUTSIDE(compcv) = (CV*)SvREFCNT_inc((SV*)cv);
748a9306 3344 SvREFCNT_dec(compcv);
a0d0e21e
LW		 3345 }
3346 else {
748a9306 3347 cv = compcv;
44a8e56a 3348 if (name) {
3349 GvCV(gv) = cv;
3350 GvCVGEN(gv) = 0;
3351 sub_generation++;
3352 }
a0d0e21e 3353 }
44a8e56a 3354 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805 3355 CvFILEGV(cv) = curcop->cop_filegv;
8990e307 3356 CvSTASH(cv) = curstash;
11343788
MB		 3357#ifdef USE_THREADS
3358 CvOWNER(cv) = 0;
12ca11f6 3359 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3360 MUTEX_INIT(CvMUTEXP(cv));
11343788 3361#endif /* USE_THREADS */
8990e307 3362
3fe9a6f1 3363 if (ps)
3364 sv_setpv((SV*)cv, ps);
4633a7c4 3365
c07a80fd 3366 if (error_count) {
3367 op_free(block);
3368 block = Nullop;
68dc0745 3369 if (name) {
3370 char *s = strrchr(name, ':');
3371 s = s ? s+1 : name;
6d4c2119
CS		 3372 if (strEQ(s, "BEGIN")) {
3373 char *not_safe =
3374 "BEGIN not safe after errors--compilation aborted";
3375 if (in_eval & 4)
3376 croak(not_safe);
3377 else {
3378 /* force display of errors found but not reported */
38a03e6e
MB		 3379 sv_catpv(ERRSV, not_safe);
3380 croak("%s", SvPVx(ERRSV, na));
6d4c2119
CS		 3381 }
3382 }
68dc0745 3383 }
c07a80fd 3384 }
a0d0e21e 3385 if (!block) {
a0d0e21e
LW		 3386 copline = NOLINE;
3387 LEAVE_SCOPE(floor);
3388 return cv;
3389 }
3390
93965878
NIS		 3391 if (AvFILLp(comppad_name) < AvFILLp(comppad))
3392 av_store(comppad_name, AvFILLp(comppad), Nullsv);
a0d0e21e 3393
54310121 3394 if (CvCLONE(cv)) {
3395 SV **namep = AvARRAY(comppad_name);
93965878 3396 for (ix = AvFILLp(comppad); ix > 0; ix--) {
54310121 3397 SV *namesv;
3398
3399 if (SvIMMORTAL(curpad[ix]))
3400 continue;
3401 /*
3402 * The only things that a clonable function needs in its
3403 * pad are references to outer lexicals and anonymous subs.
3404 * The rest are created anew during cloning.
3405 */
3406 if (!((namesv = namep[ix]) != Nullsv &&
3407 namesv != &sv_undef &&
3408 (SvFAKE(namesv) ||
3409 *SvPVX(namesv) == '&')))
3410 {
3411 SvREFCNT_dec(curpad[ix]);
3412 curpad[ix] = Nullsv;
3413 }
3414 }
a0d0e21e 3415 }
54310121 3416 else {
3417 AV *av = newAV(); /* Will be @_ */
3418 av_extend(av, 0);
3419 av_store(comppad, 0, (SV*)av);
3420 AvFLAGS(av) = AVf_REIFY;
79072805 3421
93965878 3422 for (ix = AvFILLp(comppad); ix > 0; ix--) {
54310121 3423 if (SvIMMORTAL(curpad[ix]))
3424 continue;
3425 if (!SvPADMY(curpad[ix]))
3426 SvPADTMP_on(curpad[ix]);
3427 }
3428 }
79072805 3429
a0d0e21e 3430 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
79072805
LW		 3431 CvSTART(cv) = LINKLIST(CvROOT(cv));
3432 CvROOT(cv)->op_next = 0;
3433 peep(CvSTART(cv));
93a17b20 3434
44a8e56a 3435 if (name) {
3436 char *s;
3437
84902520 3438 if (PERLDB_SUBLINE && curstash != debstash) {
46fc3d4c 3439 SV *sv = NEWSV(0,0);
44a8e56a 3440 SV *tmpstr = sv_newmortal();
549bb64a 3441 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
44a8e56a 3442 CV *cv;
3443 HV *hv;
3444
51790459
MB		 3445 sv_setpvf(sv, "%_:%ld-%ld",
3446 GvSV(curcop->cop_filegv),
3447 (long)subline, (long)curcop->cop_line);
44a8e56a 3448 gv_efullname3(tmpstr, gv, Nullch);
3449 hv_store(GvHV(DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 3450 hv = GvHVn(db_postponed);
9607fc9c 3451 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX(tmpstr), SvCUR(tmpstr))
3452 && (cv = GvCV(db_postponed))) {
44a8e56a 3453 dSP;
3454 PUSHMARK(sp);
3455 XPUSHs(tmpstr);
3456 PUTBACK;
3457 perl_call_sv((SV*)cv, G_DISCARD);
3458 }
3459 }
79072805 3460
44a8e56a 3461 if ((s = strrchr(name,':')))
28757baa 3462 s++;
3463 else
3464 s = name;
68dc0745 3465 if (strEQ(s, "BEGIN")) {
2ae324a7 3466 I32 oldscope = scopestack_ix;
28757baa 3467 ENTER;
3468 SAVESPTR(compiling.cop_filegv);
3469 SAVEI16(compiling.cop_line);
3470 SAVEI32(perldb);
3471 save_svref(&rs);
3472 sv_setsv(rs, nrs);
3473
3474 if (!beginav)
3475 beginav = newAV();
3476 DEBUG_x( dump_sub(gv) );
3477 av_push(beginav, (SV *)cv);
3478 GvCV(gv) = 0;
68dc0745 3479 call_list(oldscope, beginav);
a6006777 3480
28757baa 3481 curcop = &compiling;
3482 LEAVE;
3483 }
3484 else if (strEQ(s, "END") && !error_count) {
3485 if (!endav)
3486 endav = newAV();
3487 av_unshift(endav, 1);
3488 av_store(endav, 0, (SV *)cv);
3489 GvCV(gv) = 0;
3490 }
7d07dbc2
MB		 3491 else if (strEQ(s, "INIT") && !error_count) {
3492 if (!initav)
3493 initav = newAV();
3494 av_push(initav, SvREFCNT_inc(cv));
ae77835f 3495 }
79072805 3496 }
a6006777 3497
aa689395 3498 done:
79072805 3499 copline = NOLINE;
8990e307 3500 LEAVE_SCOPE(floor);
a0d0e21e 3501 return cv;
79072805
LW		 3502}
3503
57d3b86d 3504CV *
aeea060c 3505newXS(char *name, void (*subaddr) (CV *), char *filename)
a0d0e21e 3506{
11343788 3507 dTHR;
44a8e56a 3508 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 3509 register CV *cv;
44a8e56a 3510
3511 if (cv = (name ? GvCV(gv) : Nullcv)) {
3512 if (GvCVGEN(gv)) {
3513 /* just a cached method */
3514 SvREFCNT_dec(cv);
3515 cv = 0;
3516 }
3517 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3518 /* already defined (or promised) */
a0d0e21e
LW		 3519 if (dowarn) {
3520 line_t oldline = curcop->cop_line;
a0d0e21e
LW		 3521 curcop->cop_line = copline;
3522 warn("Subroutine %s redefined",name);
3523 curcop->cop_line = oldline;
3524 }
3525 SvREFCNT_dec(cv);
3526 cv = 0;
79072805 3527 }
79072805 3528 }
44a8e56a 3529
3530 if (cv) /* must reuse cv if autoloaded */
3531 cv_undef(cv);
a0d0e21e
LW		 3532 else {
3533 cv = (CV*)NEWSV(1105,0);
3534 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 3535 if (name) {
3536 GvCV(gv) = cv;
3537 GvCVGEN(gv) = 0;
3538 sub_generation++;
3539 }
a0d0e21e 3540 }
5196be3e 3541 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
11343788 3542#ifdef USE_THREADS
12ca11f6 3543 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3544 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3545 CvOWNER(cv) = 0;
3546#endif /* USE_THREADS */
79072805 3547 CvFILEGV(cv) = gv_fetchfile(filename);
a0d0e21e 3548 CvXSUB(cv) = subaddr;
44a8e56a 3549
28757baa 3550 if (name) {
3551 char *s = strrchr(name,':');
3552 if (s)
3553 s++;
3554 else
3555 s = name;
3556 if (strEQ(s, "BEGIN")) {
3557 if (!beginav)
3558 beginav = newAV();
44a8e56a 3559 av_push(beginav, (SV *)cv);
3560 GvCV(gv) = 0;
28757baa 3561 }
3562 else if (strEQ(s, "END")) {
3563 if (!endav)
3564 endav = newAV();
3565 av_unshift(endav, 1);
44a8e56a 3566 av_store(endav, 0, (SV *)cv);
3567 GvCV(gv) = 0;
28757baa 3568 }
7d07dbc2
MB		 3569 else if (strEQ(s, "INIT")) {
3570 if (!initav)
3571 initav = newAV();
3572 av_push(initav, (SV *)cv);
ae77835f 3573 }
28757baa 3574 }
8990e307 3575 else
a5f75d66 3576 CvANON_on(cv);
44a8e56a 3577
a0d0e21e 3578 return cv;
79072805
LW		 3579}
3580
3581void
8ac85365 3582newFORM(I32 floor, OP *o, OP *block)
79072805 3583{
11343788 3584 dTHR;
79072805
LW		 3585 register CV *cv;
3586 char *name;
3587 GV *gv;
a0d0e21e 3588 I32 ix;
79072805 3589
11343788
MB		 3590 if (o)
3591 name = SvPVx(cSVOPo->op_sv, na);
79072805
LW		 3592 else
3593 name = "STDOUT";
85e6fe83 3594 gv = gv_fetchpv(name,TRUE, SVt_PVFM);
a5f75d66 3595 GvMULTI_on(gv);
79072805
LW		 3596 if (cv = GvFORM(gv)) {
3597 if (dowarn) {
3598 line_t oldline = curcop->cop_line;
3599
3600 curcop->cop_line = copline;
3601 warn("Format %s redefined",name);
3602 curcop->cop_line = oldline;
3603 }
8990e307 3604 SvREFCNT_dec(cv);
79072805 3605 }