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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));
883ffac3 44static OP *new_logop _((I32 type, I32 flags, OP **firstp, OP **otherp));
79072805 45
4633a7c4 46static char*
8ac85365 47gv_ename(GV *gv)
4633a7c4
LW		 48{
49 SV* tmpsv = sv_newmortal();
46fc3d4c 50 gv_efullname3(tmpsv, gv, Nullch);
4633a7c4
LW		 51 return SvPV(tmpsv,na);
52}
53
8990e307 54static OP *
8ac85365 55no_fh_allowed(OP *o)
79072805 56{
46fc3d4c 57 yyerror(form("Missing comma after first argument to %s function",
5196be3e 58 op_desc[o->op_type]));
11343788 59 return o;
79072805
LW		 60}
61
8990e307 62static OP *
8ac85365 63too_few_arguments(OP *o, char *name)
79072805 64{
46fc3d4c 65 yyerror(form("Not enough arguments for %s", name));
11343788 66 return o;
79072805
LW		 67}
68
8990e307 69static OP *
8ac85365 70too_many_arguments(OP *o, char *name)
79072805 71{
46fc3d4c 72 yyerror(form("Too many arguments for %s", name));
11343788 73 return o;
79072805
LW		 74}
75
3bc5dc61 76static void
8ac85365 77bad_type(I32 n, char *t, char *name, OP *kid)
8990e307 78{
46fc3d4c 79 yyerror(form("Type of arg %d to %s must be %s (not %s)",
80 (int)n, name, t, op_desc[kid->op_type]));
8990e307
LW		 81}
82
a0d0e21e 83void
8ac85365 84assertref(OP *o)
a0d0e21e 85{
11343788 86 int type = o->op_type;
a0d0e21e 87 if (type != OP_AELEM && type != OP_HELEM) {
46fc3d4c 88 yyerror(form("Can't use subscript on %s", op_desc[type]));
bde90e66 89 if (type == OP_ENTERSUB || type == OP_RV2HV || type == OP_PADHV) {
9c82454c 90 dTHR;
bde90e66
HS		 91 SV *msg = sv_2mortal(
92 newSVpvf("(Did you mean $ or @ instead of %c?)\n",
93 type == OP_ENTERSUB ? '&' : '%'));
94 if (in_eval & 2)
95 warn("%_", msg);
96 else if (in_eval)
97 sv_catsv(GvSV(errgv), msg);
98 else
99 PerlIO_write(PerlIO_stderr(), SvPVX(msg), SvCUR(msg));
100 }
a0d0e21e
LW		 101 }
102}
103
79072805
LW		 104/* "register" allocation */
105
106PADOFFSET
8ac85365 107pad_allocmy(char *name)
93a17b20 108{
11343788 109 dTHR;
a0d0e21e
LW		 110 PADOFFSET off;
111 SV *sv;
112
113 if (!(isALPHA(name[1]) || name[1] == '_' && (int)strlen(name) > 2)) {
46fc3d4c 114 if (!isPRINT(name[1])) {
115 name[3] = '\0';
116 name[2] = toCTRL(name[1]);
117 name[1] = '^';
118 }
a0d0e21e
LW		 119 croak("Can't use global %s in \"my\"",name);
120 }
93965878 121 if (dowarn && AvFILLp(comppad_name) >= 0) {
b1cb66bf 122 SV **svp = AvARRAY(comppad_name);
93965878 123 for (off = AvFILLp(comppad_name); off > comppad_name_floor; off--) {
b1cb66bf 124 if ((sv = svp[off])
125 && sv != &sv_undef
126 && SvIVX(sv) == 999999999 /* var is in open scope */
127 && strEQ(name, SvPVX(sv)))
128 {
129 warn("\"my\" variable %s masks earlier declaration in same scope", name);
130 break;
131 }
132 }
133 }
a0d0e21e
LW		 134 off = pad_alloc(OP_PADSV, SVs_PADMY);
135 sv = NEWSV(1102,0);
93a17b20
LW		 136 sv_upgrade(sv, SVt_PVNV);
137 sv_setpv(sv, name);
c750a3ec
MB		 138 if (in_my_stash) {
139 if (*name != '$')
140 croak("Can't declare class for non-scalar %s in \"my\"",name);
141 SvOBJECT_on(sv);
142 (void)SvUPGRADE(sv, SVt_PVMG);
143 SvSTASH(sv) = (HV*)SvREFCNT_inc(in_my_stash);
144 sv_objcount++;
145 }
8990e307 146 av_store(comppad_name, off, sv);
748a9306 147 SvNVX(sv) = (double)999999999;
8990e307
LW		 148 SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
149 if (!min_intro_pending)
150 min_intro_pending = off;
151 max_intro_pending = off;
93a17b20 152 if (*name == '@')
463ee0b2 153 av_store(comppad, off, (SV*)newAV());
93a17b20 154 else if (*name == '%')
463ee0b2 155 av_store(comppad, off, (SV*)newHV());
ed6116ce 156 SvPADMY_on(curpad[off]);
93a17b20
LW		 157 return off;
158}
159
748a9306 160static PADOFFSET
bbce6d69 161pad_findlex(char *name, PADOFFSET newoff, U32 seq, CV* startcv, I32 cx_ix)
93a17b20 162{
11343788 163 dTHR;
748a9306 164 CV *cv;
93a17b20
LW		 165 I32 off;
166 SV *sv;
93a17b20 167 register I32 i;
c09156bb 168 register PERL_CONTEXT *cx;
a0d0e21e 169 int saweval;
93a17b20 170
748a9306 171 for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
4fdae800 172 AV *curlist = CvPADLIST(cv);
173 SV **svp = av_fetch(curlist, 0, FALSE);
748a9306 174 AV *curname;
4fdae800 175
748a9306 176 if (!svp || *svp == &sv_undef)
4633a7c4 177 continue;
748a9306
LW		 178 curname = (AV*)*svp;
179 svp = AvARRAY(curname);
93965878 180 for (off = AvFILLp(curname); off > 0; off--) {
748a9306
LW		 181 if ((sv = svp[off]) &&
182 sv != &sv_undef &&
183 seq <= SvIVX(sv) &&
13826f2c 184 seq > I_32(SvNVX(sv)) &&
748a9306
LW		 185 strEQ(SvPVX(sv), name))
186 {
5f05dabc 187 I32 depth;
188 AV *oldpad;
189 SV *oldsv;
190
191 depth = CvDEPTH(cv);
192 if (!depth) {
9607fc9c 193 if (newoff) {
194 if (SvFAKE(sv))
195 continue;
4fdae800 196 return 0; /* don't clone from inactive stack frame */
9607fc9c 197 }
5f05dabc 198 depth = 1;
199 }
200 oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
201 oldsv = *av_fetch(oldpad, off, TRUE);
748a9306 202 if (!newoff) { /* Not a mere clone operation. */
9607fc9c 203 SV *namesv = NEWSV(1103,0);
748a9306 204 newoff = pad_alloc(OP_PADSV, SVs_PADMY);
9607fc9c 205 sv_upgrade(namesv, SVt_PVNV);
206 sv_setpv(namesv, name);
207 av_store(comppad_name, newoff, namesv);
208 SvNVX(namesv) = (double)curcop->cop_seq;
209 SvIVX(namesv) = 999999999; /* A ref, intro immediately */
210 SvFAKE_on(namesv); /* A ref, not a real var */
774d564b 211 if (CvANON(compcv) || SvTYPE(compcv) == SVt_PVFM) {
28757baa 212 /* "It's closures all the way down." */
213 CvCLONE_on(compcv);
54310121 214 if (cv == startcv) {
215 if (CvANON(compcv))
216 oldsv = Nullsv; /* no need to keep ref */
217 }
218 else {
28757baa 219 CV *bcv;
220 for (bcv = startcv;
221 bcv && bcv != cv && !CvCLONE(bcv);
222 bcv = CvOUTSIDE(bcv)) {
223 if (CvANON(bcv))
224 CvCLONE_on(bcv);
225 else {
774d564b 226 if (dowarn && !CvUNIQUE(cv))
44a8e56a 227 warn(
228 "Variable \"%s\" may be unavailable",
28757baa 229 name);
230 break;
231 }
232 }
233 }
234 }
44a8e56a 235 else if (!CvUNIQUE(compcv)) {
9607fc9c 236 if (dowarn && !SvFAKE(sv) && !CvUNIQUE(cv))
44a8e56a 237 warn("Variable \"%s\" will not stay shared", name);
5f05dabc 238 }
748a9306 239 }
199100c8 240 av_store(comppad, newoff, SvREFCNT_inc(oldsv));
748a9306
LW		 241 return newoff;
242 }
93a17b20
LW		 243 }
244 }
245
246 /* Nothing in current lexical context--try eval's context, if any.
247 * This is necessary to let the perldb get at lexically scoped variables.
248 * XXX This will also probably interact badly with eval tree caching.
249 */
250
a0d0e21e 251 saweval = 0;
748a9306 252 for (i = cx_ix; i >= 0; i--) {
93a17b20
LW		 253 cx = &cxstack[i];
254 switch (cx->cx_type) {
255 default:
748a9306
LW		 256 if (i == 0 && saweval) {
257 seq = cxstack[saweval].blk_oldcop->cop_seq;
258 return pad_findlex(name, newoff, seq, main_cv, 0);
259 }
93a17b20
LW		 260 break;
261 case CXt_EVAL:
44a8e56a 262 switch (cx->blk_eval.old_op_type) {
263 case OP_ENTEREVAL:
264 saweval = i;
265 break;
266 case OP_REQUIRE:
267 /* require must have its own scope */
268 return 0;
269 }
93a17b20
LW		 270 break;
271 case CXt_SUB:
272 if (!saweval)
273 return 0;
274 cv = cx->blk_sub.cv;
748a9306
LW		 275 if (debstash && CvSTASH(cv) == debstash) { /* ignore DB'* scope */
276 saweval = i; /* so we know where we were called from */
93a17b20 277 continue;
93a17b20 278 }
748a9306
LW		 279 seq = cxstack[saweval].blk_oldcop->cop_seq;
280 return pad_findlex(name, newoff, seq, cv, i-1);
93a17b20
LW		 281 }
282 }
283
748a9306
LW		 284 return 0;
285}
a0d0e21e 286
748a9306 287PADOFFSET
8ac85365 288pad_findmy(char *name)
748a9306 289{
11343788 290 dTHR;
748a9306 291 I32 off;
54310121 292 I32 pendoff = 0;
748a9306
LW		 293 SV *sv;
294 SV **svp = AvARRAY(comppad_name);
bbce6d69 295 U32 seq = cop_seqmax;
748a9306 296
11343788
MB		 297#ifdef USE_THREADS
298 /*
299 * Special case to get lexical (and hence per-thread) @_.
300 * XXX I need to find out how to tell at parse-time whether use
301 * of @_ should refer to a lexical (from a sub) or defgv (global
302 * scope and maybe weird sub-ish things like formats). See
303 * startsub in perly.y. It's possible that @_ could be lexical
304 * (at least from subs) even in non-threaded perl.
305 */
306 if (strEQ(name, "@_"))
307 return 0; /* success. (NOT_IN_PAD indicates failure) */
308#endif /* USE_THREADS */
309
748a9306 310 /* The one we're looking for is probably just before comppad_name_fill. */
93965878 311 for (off = AvFILLp(comppad_name); off > 0; off--) {
a0d0e21e
LW		 312 if ((sv = svp[off]) &&
313 sv != &sv_undef &&
54310121 314 (!SvIVX(sv) ||
315 (seq <= SvIVX(sv) &&
316 seq > I_32(SvNVX(sv)))) &&
a0d0e21e
LW		 317 strEQ(SvPVX(sv), name))
318 {
54310121 319 if (SvIVX(sv))
320 return (PADOFFSET)off;
321 pendoff = off; /* this pending def. will override import */
a0d0e21e
LW		 322 }
323 }
748a9306
LW		 324
325 /* See if it's in a nested scope */
326 off = pad_findlex(name, 0, seq, CvOUTSIDE(compcv), cxstack_ix);
54310121 327 if (off) {
328 /* If there is a pending local definition, this new alias must die */
329 if (pendoff)
330 SvIVX(AvARRAY(comppad_name)[off]) = seq;
11343788 331 return off; /* pad_findlex returns 0 for failure...*/
54310121 332 }
11343788 333 return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */
93a17b20
LW		 334}
335
336void
8ac85365 337pad_leavemy(I32 fill)
93a17b20
LW		 338{
339 I32 off;
8990e307 340 SV **svp = AvARRAY(comppad_name);
93a17b20 341 SV *sv;
8990e307
LW		 342 if (min_intro_pending && fill < min_intro_pending) {
343 for (off = max_intro_pending; off >= min_intro_pending; off--) {
a0d0e21e 344 if ((sv = svp[off]) && sv != &sv_undef)
8990e307
LW		 345 warn("%s never introduced", SvPVX(sv));
346 }
347 }
348 /* "Deintroduce" my variables that are leaving with this scope. */
93965878 349 for (off = AvFILLp(comppad_name); off > fill; off--) {
748a9306 350 if ((sv = svp[off]) && sv != &sv_undef && SvIVX(sv) == 999999999)
463ee0b2 351 SvIVX(sv) = cop_seqmax;
93a17b20
LW		 352 }
353}
354
355PADOFFSET
8ac85365 356pad_alloc(I32 optype, U32 tmptype)
79072805 357{
11343788 358 dTHR;
79072805
LW		 359 SV *sv;
360 I32 retval;
361
362 if (AvARRAY(comppad) != curpad)
463ee0b2 363 croak("panic: pad_alloc");
a0d0e21e
LW		 364 if (pad_reset_pending)
365 pad_reset();
ed6116ce 366 if (tmptype & SVs_PADMY) {
79072805 367 do {
93965878 368 sv = *av_fetch(comppad, AvFILLp(comppad) + 1, TRUE);
ed6116ce 369 } while (SvPADBUSY(sv)); /* need a fresh one */
93965878 370 retval = AvFILLp(comppad);
79072805
LW		 371 }
372 else {
bbce6d69 373 SV **names = AvARRAY(comppad_name);
93965878 374 SSize_t names_fill = AvFILLp(comppad_name);
bbce6d69 375 for (;;) {
376 /*
377 * "foreach" index vars temporarily become aliases to non-"my"
378 * values. Thus we must skip, not just pad values that are
379 * marked as current pad values, but also those with names.
380 */
381 if (++padix <= names_fill &&
382 (sv = names[padix]) && sv != &sv_undef)
383 continue;
384 sv = *av_fetch(comppad, padix, TRUE);
385 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
386 break;
387 }
79072805
LW		 388 retval = padix;
389 }
8990e307 390 SvFLAGS(sv) |= tmptype;
79072805 391 curpad = AvARRAY(comppad);
11343788 392#ifdef USE_THREADS
5dc0d613
MB		 393 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
394 (unsigned long) thr, (unsigned long) curpad,
395 (long) retval, op_name[optype]));
11343788 396#else
d9bb4600
GS		 397 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx alloc %ld for %s\n",
398 (unsigned long) curpad,
5dc0d613 399 (long) retval, op_name[optype]));
11343788 400#endif /* USE_THREADS */
79072805
LW		 401 return (PADOFFSET)retval;
402}
403
404SV *
8990e307 405pad_sv(PADOFFSET po)
79072805 406{
11343788
MB		 407 dTHR;
408#ifdef USE_THREADS
5dc0d613
MB		 409 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
410 (unsigned long) thr, (unsigned long) curpad, po));
11343788 411#else
79072805 412 if (!po)
463ee0b2 413 croak("panic: pad_sv po");
d9bb4600
GS		 414 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx sv %d\n",
415 (unsigned long) curpad, po));
11343788 416#endif /* USE_THREADS */
79072805
LW		 417 return curpad[po]; /* eventually we'll turn this into a macro */
418}
419
420void
8990e307 421pad_free(PADOFFSET po)
79072805 422{
11343788 423 dTHR;
a0d0e21e
LW		 424 if (!curpad)
425 return;
79072805 426 if (AvARRAY(comppad) != curpad)
463ee0b2 427 croak("panic: pad_free curpad");
79072805 428 if (!po)
463ee0b2 429 croak("panic: pad_free po");
11343788 430#ifdef USE_THREADS
5dc0d613
MB		 431 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
432 (unsigned long) thr, (unsigned long) curpad, po));
11343788 433#else
d9bb4600
GS		 434 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx free %d\n",
435 (unsigned long) curpad, po));
11343788 436#endif /* USE_THREADS */
a0d0e21e 437 if (curpad[po] && curpad[po] != &sv_undef)
ed6116ce 438 SvPADTMP_off(curpad[po]);
a0d0e21e 439 if ((I32)po < padix)
79072805
LW		 440 padix = po - 1;
441}
442
443void
8990e307 444pad_swipe(PADOFFSET po)
79072805 445{
11343788 446 dTHR;
79072805 447 if (AvARRAY(comppad) != curpad)
463ee0b2 448 croak("panic: pad_swipe curpad");
79072805 449 if (!po)
463ee0b2 450 croak("panic: pad_swipe po");
11343788 451#ifdef USE_THREADS
5dc0d613
MB		 452 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
453 (unsigned long) thr, (unsigned long) curpad, po));
11343788 454#else
d9bb4600
GS		 455 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx swipe %d\n",
456 (unsigned long) curpad, po));
11343788 457#endif /* USE_THREADS */
ed6116ce 458 SvPADTMP_off(curpad[po]);
a0d0e21e
LW		 459 curpad[po] = NEWSV(1107,0);
460 SvPADTMP_on(curpad[po]);
461 if ((I32)po < padix)
79072805
LW		 462 padix = po - 1;
463}
464
d9bb4600
GS		 465/* XXX pad_reset() is currently disabled because it results in serious bugs.
466 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
467 * on the stack by OPs that use them, there are several ways to get an alias
468 * to a shared TARG. Such an alias will change randomly and unpredictably.
469 * We avoid doing this until we can think of a Better Way.
470 * GSAR 97-10-29 */
79072805 471void
8ac85365 472pad_reset(void)
79072805 473{
d9bb4600 474#ifdef USE_BROKEN_PAD_RESET
11343788 475 dTHR;
79072805
LW		 476 register I32 po;
477
478 if (AvARRAY(comppad) != curpad)
463ee0b2 479 croak("panic: pad_reset curpad");
11343788 480#ifdef USE_THREADS
5dc0d613
MB		 481 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
482 (unsigned long) thr, (unsigned long) curpad));
11343788 483#else
d9bb4600
GS		 484 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx reset\n",
485 (unsigned long) curpad));
11343788 486#endif /* USE_THREADS */
748a9306
LW		 487 if (!tainting) { /* Can't mix tainted and non-tainted temporaries. */
488 for (po = AvMAX(comppad); po > padix_floor; po--) {
ff0cee69 489 if (curpad[po] && !SvIMMORTAL(curpad[po]))
748a9306
LW		 490 SvPADTMP_off(curpad[po]);
491 }
492 padix = padix_floor;
79072805 493 }
d9bb4600 494#endif
a0d0e21e 495 pad_reset_pending = FALSE;
79072805
LW		 496}
497
a863c7d1 498#ifdef USE_THREADS
54b9620d 499/* find_threadsv is not reentrant */
a863c7d1 500PADOFFSET
54b9620d 501find_threadsv(char *name)
a863c7d1
MB		 502{
503 dTHR;
504 char *p;
505 PADOFFSET key;
554b3eca 506 SV **svp;
54b9620d
MB		 507 /* We currently only handle names of a single character */
508 p = strchr(threadsv_names, *name);
a863c7d1
MB		 509 if (!p)
510 return NOT_IN_PAD;
54b9620d
MB		 511 key = p - threadsv_names;
512 svp = av_fetch(thr->threadsv, key, FALSE);
554b3eca
MB		 513 if (!svp) {
514 SV *sv = NEWSV(0, 0);
54b9620d 515 av_store(thr->threadsv, key, sv);
940cb80d 516 thr->threadsvp = AvARRAY(thr->threadsv);
554b3eca
MB		 517 /*
518 * Some magic variables used to be automagically initialised
519 * in gv_fetchpv. Those which are now per-thread magicals get
520 * initialised here instead.
521 */
522 switch (*name) {
54b9620d
MB		 523 case '_':
524 break;
554b3eca
MB		 525 case ';':
526 sv_setpv(sv, "\034");
54b9620d 527 sv_magic(sv, 0, 0, name, 1);
554b3eca 528 break;
c277df42
IZ		 529 case '&':
530 case '`':
531 case '\'':
532 sawampersand = TRUE;
533 SvREADONLY_on(sv);
d8b5173a 534 /* FALL THROUGH */
54b9620d
MB		 535 default:
536 sv_magic(sv, 0, 0, name, 1);
554b3eca 537 }
a863c7d1 538 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
54b9620d 539 "find_threadsv: new SV %p for $%s%c\n",
554b3eca
MB		 540 sv, (*name < 32) ? "^" : "",
541 (*name < 32) ? toCTRL(*name) : *name));
a863c7d1
MB		 542 }
543 return key;
544}
545#endif /* USE_THREADS */
546
79072805
LW		 547/* Destructor */
548
549void
8ac85365 550op_free(OP *o)
79072805 551{
85e6fe83 552 register OP *kid, *nextkid;
79072805 553
5dc0d613 554 if (!o || o->op_seq == (U16)-1)
79072805
LW		 555 return;
556
11343788
MB		 557 if (o->op_flags & OPf_KIDS) {
558 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 559 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 560 op_free(kid);
85e6fe83 561 }
79072805
LW		 562 }
563
11343788 564 switch (o->op_type) {
8990e307 565 case OP_NULL:
11343788 566 o->op_targ = 0; /* Was holding old type, if any. */
8990e307 567 break;
a0d0e21e 568 case OP_ENTEREVAL:
11343788 569 o->op_targ = 0; /* Was holding hints. */
a0d0e21e 570 break;
554b3eca 571#ifdef USE_THREADS
2faa37cc 572 case OP_THREADSV:
54b9620d 573 o->op_targ = 0; /* Was holding index into thr->threadsv AV. */
554b3eca
MB		 574 break;
575#endif /* USE_THREADS */
a6006777 576 default:
5196be3e 577 if (!(o->op_flags & OPf_REF) || (check[o->op_type] != ck_ftst))
a6006777 578 break;
579 /* FALL THROUGH */
463ee0b2 580 case OP_GVSV:
79072805 581 case OP_GV:
a6006777 582 case OP_AELEMFAST:
11343788 583 SvREFCNT_dec(cGVOPo->op_gv);
8990e307
LW		 584 break;
585 case OP_NEXTSTATE:
586 case OP_DBSTATE:
5196be3e 587 Safefree(cCOPo->cop_label);
11343788 588 SvREFCNT_dec(cCOPo->cop_filegv);
79072805
LW		 589 break;
590 case OP_CONST:
11343788 591 SvREFCNT_dec(cSVOPo->op_sv);
79072805 592 break;
748a9306
LW		 593 case OP_GOTO:
594 case OP_NEXT:
595 case OP_LAST:
596 case OP_REDO:
11343788 597 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 598 break;
599 /* FALL THROUGH */
a0d0e21e 600 case OP_TRANS:
11343788 601 Safefree(cPVOPo->op_pv);
a0d0e21e
LW		 602 break;
603 case OP_SUBST:
11343788 604 op_free(cPMOPo->op_pmreplroot);
a0d0e21e 605 /* FALL THROUGH */
748a9306 606 case OP_PUSHRE:
a0d0e21e 607 case OP_MATCH:
c277df42 608 ReREFCNT_dec(cPMOPo->op_pmregexp);
a0d0e21e 609 break;
79072805
LW		 610 }
611
11343788
MB		 612 if (o->op_targ > 0)
613 pad_free(o->op_targ);
8990e307 614
11343788 615 Safefree(o);
79072805
LW		 616}
617
8990e307 618static void
8ac85365 619null(OP *o)
8990e307 620{
54b9620d 621 if (o->op_type != OP_NULL && o->op_type != OP_THREADSV && o->op_targ > 0)
11343788
MB		 622 pad_free(o->op_targ);
623 o->op_targ = o->op_type;
624 o->op_type = OP_NULL;
625 o->op_ppaddr = ppaddr[OP_NULL];
8990e307
LW		 626}
627
79072805
LW		 628/* Contextualizers */
629
463ee0b2 630#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 631
632OP *
8ac85365 633linklist(OP *o)
79072805
LW		 634{
635 register OP *kid;
636
11343788
MB		 637 if (o->op_next)
638 return o->op_next;
79072805
LW		 639
640 /* establish postfix order */
11343788
MB		 641 if (cUNOPo->op_first) {
642 o->op_next = LINKLIST(cUNOPo->op_first);
643 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 644 if (kid->op_sibling)
645 kid->op_next = LINKLIST(kid->op_sibling);
646 else
11343788 647 kid->op_next = o;
79072805
LW		 648 }
649 }
650 else
11343788 651 o->op_next = o;
79072805 652
11343788 653 return o->op_next;
79072805
LW		 654}
655
656OP *
8ac85365 657scalarkids(OP *o)
79072805
LW		 658{
659 OP *kid;
11343788
MB		 660 if (o && o->op_flags & OPf_KIDS) {
661 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 662 scalar(kid);
663 }
11343788 664 return o;
79072805
LW		 665}
666
a0d0e21e 667static OP *
8ac85365 668scalarboolean(OP *o)
8990e307
LW		 669{
670 if (dowarn &&
11343788 671 o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
0f15f207 672 dTHR;
a0d0e21e
LW		 673 line_t oldline = curcop->cop_line;
674
675 if (copline != NOLINE)
676 curcop->cop_line = copline;
677 warn("Found = in conditional, should be ==");
678 curcop->cop_line = oldline;
679 }
11343788 680 return scalar(o);
8990e307
LW		 681}
682
683OP *
8ac85365 684scalar(OP *o)
79072805
LW		 685{
686 OP *kid;
687
a0d0e21e 688 /* assumes no premature commitment */
5dc0d613
MB		 689 if (!o || (o->op_flags & OPf_WANT) || error_count
690 || o->op_type == OP_RETURN)
11343788 691 return o;
79072805 692
5dc0d613 693 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 694
11343788 695 switch (o->op_type) {
79072805 696 case OP_REPEAT:
11343788
MB		 697 if (o->op_private & OPpREPEAT_DOLIST)
698 null(((LISTOP*)cBINOPo->op_first)->op_first);
699 scalar(cBINOPo->op_first);
8990e307 700 break;
79072805
LW		 701 case OP_OR:
702 case OP_AND:
703 case OP_COND_EXPR:
11343788 704 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 705 scalar(kid);
79072805 706 break;
a0d0e21e 707 case OP_SPLIT:
11343788 708 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 709 if (!kPMOP->op_pmreplroot)
710 deprecate("implicit split to @_");
711 }
712 /* FALL THROUGH */
79072805
LW		 713 case OP_MATCH:
714 case OP_SUBST:
715 case OP_NULL:
8990e307 716 default:
11343788
MB		 717 if (o->op_flags & OPf_KIDS) {
718 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 719 scalar(kid);
720 }
79072805
LW		 721 break;
722 case OP_LEAVE:
723 case OP_LEAVETRY:
5dc0d613 724 kid = cLISTOPo->op_first;
54310121 725 scalar(kid);
726 while (kid = kid->op_sibling) {
727 if (kid->op_sibling)
728 scalarvoid(kid);
729 else
730 scalar(kid);
731 }
0f15f207 732 WITH_THR(curcop = &compiling);
54310121 733 break;
748a9306 734 case OP_SCOPE:
79072805 735 case OP_LINESEQ:
8990e307 736 case OP_LIST:
11343788 737 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 738 if (kid->op_sibling)
739 scalarvoid(kid);
740 else
741 scalar(kid);
742 }
0f15f207 743 WITH_THR(curcop = &compiling);
79072805
LW		 744 break;
745 }
11343788 746 return o;
79072805
LW		 747}
748
749OP *
8ac85365 750scalarvoid(OP *o)
79072805
LW		 751{
752 OP *kid;
8990e307
LW		 753 char* useless = 0;
754 SV* sv;
79072805 755
54310121 756 /* assumes no premature commitment */
5dc0d613
MB		 757 if (!o || (o->op_flags & OPf_WANT) == OPf_WANT_LIST || error_count
758 || o->op_type == OP_RETURN)
11343788 759 return o;
79072805 760
5dc0d613 761 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 762
11343788 763 switch (o->op_type) {
79072805 764 default:
11343788 765 if (!(opargs[o->op_type] & OA_FOLDCONST))
8990e307 766 break;
36477c24 767 /* FALL THROUGH */
768 case OP_REPEAT:
11343788 769 if (o->op_flags & OPf_STACKED)
8990e307
LW		 770 break;
771 /* FALL THROUGH */
772 case OP_GVSV:
773 case OP_WANTARRAY:
774 case OP_GV:
775 case OP_PADSV:
776 case OP_PADAV:
777 case OP_PADHV:
778 case OP_PADANY:
779 case OP_AV2ARYLEN:
8990e307 780 case OP_REF:
a0d0e21e
LW		 781 case OP_REFGEN:
782 case OP_SREFGEN:
8990e307
LW		 783 case OP_DEFINED:
784 case OP_HEX:
785 case OP_OCT:
786 case OP_LENGTH:
787 case OP_SUBSTR:
788 case OP_VEC:
789 case OP_INDEX:
790 case OP_RINDEX:
791 case OP_SPRINTF:
792 case OP_AELEM:
793 case OP_AELEMFAST:
794 case OP_ASLICE:
8990e307
LW		 795 case OP_HELEM:
796 case OP_HSLICE:
797 case OP_UNPACK:
798 case OP_PACK:
8990e307
LW		 799 case OP_JOIN:
800 case OP_LSLICE:
801 case OP_ANONLIST:
802 case OP_ANONHASH:
803 case OP_SORT:
804 case OP_REVERSE:
805 case OP_RANGE:
806 case OP_FLIP:
807 case OP_FLOP:
808 case OP_CALLER:
809 case OP_FILENO:
810 case OP_EOF:
811 case OP_TELL:
812 case OP_GETSOCKNAME:
813 case OP_GETPEERNAME:
814 case OP_READLINK:
815 case OP_TELLDIR:
816 case OP_GETPPID:
817 case OP_GETPGRP:
818 case OP_GETPRIORITY:
819 case OP_TIME:
820 case OP_TMS:
821 case OP_LOCALTIME:
822 case OP_GMTIME:
823 case OP_GHBYNAME:
824 case OP_GHBYADDR:
825 case OP_GHOSTENT:
826 case OP_GNBYNAME:
827 case OP_GNBYADDR:
828 case OP_GNETENT:
829 case OP_GPBYNAME:
830 case OP_GPBYNUMBER:
831 case OP_GPROTOENT:
832 case OP_GSBYNAME:
833 case OP_GSBYPORT:
834 case OP_GSERVENT:
835 case OP_GPWNAM:
836 case OP_GPWUID:
837 case OP_GGRNAM:
838 case OP_GGRGID:
839 case OP_GETLOGIN:
11343788
MB		 840 if (!(o->op_private & OPpLVAL_INTRO))
841 useless = op_desc[o->op_type];
8990e307
LW		 842 break;
843
844 case OP_RV2GV:
845 case OP_RV2SV:
846 case OP_RV2AV:
847 case OP_RV2HV:
11343788
MB		 848 if (!(o->op_private & OPpLVAL_INTRO) &&
849 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 850 useless = "a variable";
851 break;
79072805 852
93a17b20 853 case OP_NEXTSTATE:
8990e307 854 case OP_DBSTATE:
0f15f207 855 WITH_THR(curcop = ((COP*)o)); /* for warning below */
93a17b20
LW		 856 break;
857
79072805 858 case OP_CONST:
11343788 859 sv = cSVOPo->op_sv;
8990e307
LW		 860 if (dowarn) {
861 useless = "a constant";
862 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
863 useless = 0;
864 else if (SvPOK(sv)) {
865 if (strnEQ(SvPVX(sv), "di", 2) ||
a0d0e21e 866 strnEQ(SvPVX(sv), "ds", 2) ||
8990e307
LW		 867 strnEQ(SvPVX(sv), "ig", 2))
868 useless = 0;
869 }
870 }
11343788 871 null(o); /* don't execute a constant */
8990e307 872 SvREFCNT_dec(sv); /* don't even remember it */
79072805
LW		 873 break;
874
875 case OP_POSTINC:
11343788
MB		 876 o->op_type = OP_PREINC; /* pre-increment is faster */
877 o->op_ppaddr = ppaddr[OP_PREINC];
79072805
LW		 878 break;
879
880 case OP_POSTDEC:
11343788
MB		 881 o->op_type = OP_PREDEC; /* pre-decrement is faster */
882 o->op_ppaddr = ppaddr[OP_PREDEC];
79072805
LW		 883 break;
884
79072805
LW		 885 case OP_OR:
886 case OP_AND:
887 case OP_COND_EXPR:
11343788 888 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 889 scalarvoid(kid);
890 break;
5aabfad6 891
a0d0e21e 892 case OP_NULL:
11343788 893 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
0f15f207 894 WITH_THR(curcop = ((COP*)o)); /* for warning below */
11343788 895 if (o->op_flags & OPf_STACKED)
a0d0e21e 896 break;
5aabfad6 897 /* FALL THROUGH */
79072805
LW		 898 case OP_ENTERTRY:
899 case OP_ENTER:
900 case OP_SCALAR:
11343788 901 if (!(o->op_flags & OPf_KIDS))
79072805 902 break;
54310121 903 /* FALL THROUGH */
463ee0b2 904 case OP_SCOPE:
79072805
LW		 905 case OP_LEAVE:
906 case OP_LEAVETRY:
a0d0e21e 907 case OP_LEAVELOOP:
79072805 908 case OP_LINESEQ:
79072805 909 case OP_LIST:
11343788 910 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 911 scalarvoid(kid);
912 break;
c90c0ff4 913 case OP_ENTEREVAL:
5196be3e 914 scalarkids(o);
c90c0ff4 915 break;
5aabfad6 916 case OP_REQUIRE:
c90c0ff4 917 /* all requires must return a boolean value */
5196be3e
MB		 918 o->op_flags &= ~OPf_WANT;
919 return scalar(o);
a0d0e21e 920 case OP_SPLIT:
11343788 921 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 922 if (!kPMOP->op_pmreplroot)
923 deprecate("implicit split to @_");
924 }
925 break;
79072805 926 }
8990e307
LW		 927 if (useless && dowarn)
928 warn("Useless use of %s in void context", useless);
11343788 929 return o;
79072805
LW		 930}
931
932OP *
8ac85365 933listkids(OP *o)
79072805
LW		 934{
935 OP *kid;
11343788
MB		 936 if (o && o->op_flags & OPf_KIDS) {
937 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 938 list(kid);
939 }
11343788 940 return o;
79072805
LW		 941}
942
943OP *
8ac85365 944list(OP *o)
79072805
LW		 945{
946 OP *kid;
947
a0d0e21e 948 /* assumes no premature commitment */
5dc0d613
MB		 949 if (!o || (o->op_flags & OPf_WANT) || error_count
950 || o->op_type == OP_RETURN)
11343788 951 return o;
79072805 952
5dc0d613 953 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 954
11343788 955 switch (o->op_type) {
79072805
LW		 956 case OP_FLOP:
957 case OP_REPEAT:
11343788 958 list(cBINOPo->op_first);
79072805
LW		 959 break;
960 case OP_OR:
961 case OP_AND:
962 case OP_COND_EXPR:
11343788 963 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 964 list(kid);
965 break;
966 default:
967 case OP_MATCH:
968 case OP_SUBST:
969 case OP_NULL:
11343788 970 if (!(o->op_flags & OPf_KIDS))
79072805 971 break;
11343788
MB		 972 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
973 list(cBINOPo->op_first);
974 return gen_constant_list(o);
79072805
LW		 975 }
976 case OP_LIST:
11343788 977 listkids(o);
79072805
LW		 978 break;
979 case OP_LEAVE:
980 case OP_LEAVETRY:
5dc0d613 981 kid = cLISTOPo->op_first;
54310121 982 list(kid);
983 while (kid = kid->op_sibling) {
984 if (kid->op_sibling)
985 scalarvoid(kid);
986 else
987 list(kid);
988 }
0f15f207 989 WITH_THR(curcop = &compiling);
54310121 990 break;
748a9306 991 case OP_SCOPE:
79072805 992 case OP_LINESEQ:
11343788 993 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 994 if (kid->op_sibling)
995 scalarvoid(kid);
996 else
997 list(kid);
998 }
0f15f207 999 WITH_THR(curcop = &compiling);
79072805 1000 break;
c90c0ff4 1001 case OP_REQUIRE:
1002 /* all requires must return a boolean value */
5196be3e
MB		 1003 o->op_flags &= ~OPf_WANT;
1004 return scalar(o);
79072805 1005 }
11343788 1006 return o;
79072805
LW		 1007}
1008
1009OP *
8ac85365 1010scalarseq(OP *o)
79072805
LW		 1011{
1012 OP *kid;
1013
11343788
MB		 1014 if (o) {
1015 if (o->op_type == OP_LINESEQ ||
1016 o->op_type == OP_SCOPE ||
1017 o->op_type == OP_LEAVE ||
1018 o->op_type == OP_LEAVETRY)
463ee0b2 1019 {
0f15f207 1020 dTHR;
11343788 1021 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1022 if (kid->op_sibling) {
463ee0b2 1023 scalarvoid(kid);
ed6116ce 1024 }
463ee0b2
LW		 1025 }
1026 curcop = &compiling;
79072805 1027 }
11343788 1028 o->op_flags &= ~OPf_PARENS;
85e6fe83 1029 if (hints & HINT_BLOCK_SCOPE)
11343788 1030 o->op_flags |= OPf_PARENS;
79072805 1031 }
8990e307 1032 else
11343788
MB		 1033 o = newOP(OP_STUB, 0);
1034 return o;
79072805
LW		 1035}
1036
a0d0e21e 1037static OP *
8ac85365 1038modkids(OP *o, I32 type)
79072805
LW		 1039{
1040 OP *kid;
11343788
MB		 1041 if (o && o->op_flags & OPf_KIDS) {
1042 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1043 mod(kid, type);
79072805 1044 }
11343788 1045 return o;
79072805
LW		 1046}
1047
463ee0b2 1048static I32 modcount;
79072805
LW		 1049
1050OP *
8ac85365 1051mod(OP *o, I32 type)
79072805 1052{
11343788 1053 dTHR;
79072805
LW		 1054 OP *kid;
1055 SV *sv;
1056
11343788
MB		 1057 if (!o || error_count)
1058 return o;
79072805 1059
11343788 1060 switch (o->op_type) {
68dc0745 1061 case OP_UNDEF:
3e3baf6d 1062 modcount++;
5dc0d613 1063 return o;
a0d0e21e 1064 case OP_CONST:
11343788 1065 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e
LW		 1066 goto nomod;
1067 if (eval_start && eval_start->op_type == OP_CONST) {
1068 compiling.cop_arybase = (I32)SvIV(((SVOP*)eval_start)->op_sv);
1069 eval_start = 0;
1070 }
1071 else if (!type) {
1072 SAVEI32(compiling.cop_arybase);
748a9306 1073 compiling.cop_arybase = 0;
a0d0e21e
LW		 1074 }
1075 else if (type == OP_REFGEN)
1076 goto nomod;
1077 else
1078 croak("That use of $[ is unsupported");
1079 break;
5f05dabc 1080 case OP_STUB:
5196be3e 1081 if (o->op_flags & OPf_PARENS)
5f05dabc 1082 break;
1083 goto nomod;
a0d0e21e
LW		 1084 case OP_ENTERSUB:
1085 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1086 !(o->op_flags & OPf_STACKED)) {
1087 o->op_type = OP_RV2CV; /* entersub => rv2cv */
1088 o->op_ppaddr = ppaddr[OP_RV2CV];
1089 assert(cUNOPo->op_first->op_type == OP_NULL);
1090 null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1091 break;
1092 }
1093 /* FALL THROUGH */
1094 default:
a0d0e21e
LW		 1095 nomod:
1096 /* grep, foreach, subcalls, refgen */
1097 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1098 break;
46fc3d4c 1099 yyerror(form("Can't modify %s in %s",
5dc0d613 1100 op_desc[o->op_type],
46fc3d4c 1101 type ? op_desc[type] : "local"));
11343788 1102 return o;
79072805 1103
a0d0e21e
LW		 1104 case OP_PREINC:
1105 case OP_PREDEC:
1106 case OP_POW:
1107 case OP_MULTIPLY:
1108 case OP_DIVIDE:
1109 case OP_MODULO:
1110 case OP_REPEAT:
1111 case OP_ADD:
1112 case OP_SUBTRACT:
1113 case OP_CONCAT:
1114 case OP_LEFT_SHIFT:
1115 case OP_RIGHT_SHIFT:
1116 case OP_BIT_AND:
1117 case OP_BIT_XOR:
1118 case OP_BIT_OR:
1119 case OP_I_MULTIPLY:
1120 case OP_I_DIVIDE:
1121 case OP_I_MODULO:
1122 case OP_I_ADD:
1123 case OP_I_SUBTRACT:
11343788 1124 if (!(o->op_flags & OPf_STACKED))
a0d0e21e
LW		 1125 goto nomod;
1126 modcount++;
1127 break;
1128
79072805 1129 case OP_COND_EXPR:
11343788 1130 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1131 mod(kid, type);
79072805
LW		 1132 break;
1133
1134 case OP_RV2AV:
1135 case OP_RV2HV:
93af7a87 1136 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1137 croak("Can't localize through a reference");
11343788 1138 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
748a9306 1139 modcount = 10000;
11343788 1140 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1141 }
1142 /* FALL THROUGH */
79072805 1143 case OP_RV2GV:
5dc0d613 1144 if (scalar_mod_type(o, type))
3fe9a6f1 1145 goto nomod;
11343788 1146 ref(cUNOPo->op_first, o->op_type);
79072805
LW		 1147 /* FALL THROUGH */
1148 case OP_AASSIGN:
1149 case OP_ASLICE:
1150 case OP_HSLICE:
93a17b20
LW		 1151 case OP_NEXTSTATE:
1152 case OP_DBSTATE:
a0d0e21e
LW		 1153 case OP_REFGEN:
1154 case OP_CHOMP:
463ee0b2 1155 modcount = 10000;
79072805 1156 break;
463ee0b2 1157 case OP_RV2SV:
11343788 1158 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1159 croak("Can't localize through a reference");
aeea060c 1160 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1161 /* FALL THROUGH */
79072805 1162 case OP_GV:
463ee0b2 1163 case OP_AV2ARYLEN:
85aff577 1164 hints |= HINT_BLOCK_SCOPE;
463ee0b2 1165 case OP_SASSIGN:
8990e307
LW		 1166 case OP_AELEMFAST:
1167 modcount++;
1168 break;
1169
748a9306
LW		 1170 case OP_PADAV:
1171 case OP_PADHV:
1172 modcount = 10000;
5196be3e
MB		 1173 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1174 return o; /* Treat \(@foo) like ordinary list. */
1175 if (scalar_mod_type(o, type))
3fe9a6f1 1176 goto nomod;
748a9306
LW		 1177 /* FALL THROUGH */
1178 case OP_PADSV:
1179 modcount++;
1180 if (!type)
1181 croak("Can't localize lexical variable %s",
11343788 1182 SvPV(*av_fetch(comppad_name, o->op_targ, 4), na));
463ee0b2
LW		 1183 break;
1184
554b3eca 1185#ifdef USE_THREADS
2faa37cc 1186 case OP_THREADSV:
554b3eca 1187 modcount++; /* XXX ??? */
554b3eca
MB		 1188 break;
1189#endif /* USE_THREADS */
1190
748a9306
LW		 1191 case OP_PUSHMARK:
1192 break;
a0d0e21e 1193
69969c6f
SB		 1194 case OP_KEYS:
1195 if (type != OP_SASSIGN)
1196 goto nomod;
5f05dabc 1197 /* FALL THROUGH */
a0d0e21e 1198 case OP_POS:
463ee0b2 1199 case OP_VEC:
a0d0e21e 1200 case OP_SUBSTR:
11343788
MB		 1201 pad_free(o->op_targ);
1202 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1203 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1204 if (o->op_flags & OPf_KIDS)
1205 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1206 break;
a0d0e21e 1207
463ee0b2
LW		 1208 case OP_AELEM:
1209 case OP_HELEM:
11343788 1210 ref(cBINOPo->op_first, o->op_type);
68dc0745 1211 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1212 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1213 o->op_private |= OPpLVAL_DEFER;
a0d0e21e 1214 modcount++;
463ee0b2
LW		 1215 break;
1216
1217 case OP_SCOPE:
1218 case OP_LEAVE:
1219 case OP_ENTER:
11343788
MB		 1220 if (o->op_flags & OPf_KIDS)
1221 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1222 break;
1223
1224 case OP_NULL:
11343788 1225 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1226 break;
11343788
MB		 1227 if (o->op_targ != OP_LIST) {
1228 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1229 break;
1230 }
1231 /* FALL THROUGH */
463ee0b2 1232 case OP_LIST:
11343788 1233 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1234 mod(kid, type);
1235 break;
1236 }
11343788 1237 o->op_flags |= OPf_MOD;
a0d0e21e
LW		 1238
1239 if (type == OP_AASSIGN || type == OP_SASSIGN)
11343788 1240 o->op_flags |= OPf_SPECIAL|OPf_REF;
a0d0e21e 1241 else if (!type) {
11343788
MB		 1242 o->op_private |= OPpLVAL_INTRO;
1243 o->op_flags &= ~OPf_SPECIAL;
463ee0b2 1244 }
a0d0e21e 1245 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
11343788
MB		 1246 o->op_flags |= OPf_REF;
1247 return o;
463ee0b2
LW		 1248}
1249
3fe9a6f1 1250static bool
8ac85365 1251scalar_mod_type(OP *o, I32 type)
3fe9a6f1 1252{
1253 switch (type) {
1254 case OP_SASSIGN:
5196be3e 1255 if (o->op_type == OP_RV2GV)
3fe9a6f1 1256 return FALSE;
1257 /* FALL THROUGH */
1258 case OP_PREINC:
1259 case OP_PREDEC:
1260 case OP_POSTINC:
1261 case OP_POSTDEC:
1262 case OP_I_PREINC:
1263 case OP_I_PREDEC:
1264 case OP_I_POSTINC:
1265 case OP_I_POSTDEC:
1266 case OP_POW:
1267 case OP_MULTIPLY:
1268 case OP_DIVIDE:
1269 case OP_MODULO:
1270 case OP_REPEAT:
1271 case OP_ADD:
1272 case OP_SUBTRACT:
1273 case OP_I_MULTIPLY:
1274 case OP_I_DIVIDE:
1275 case OP_I_MODULO:
1276 case OP_I_ADD:
1277 case OP_I_SUBTRACT:
1278 case OP_LEFT_SHIFT:
1279 case OP_RIGHT_SHIFT:
1280 case OP_BIT_AND:
1281 case OP_BIT_XOR:
1282 case OP_BIT_OR:
1283 case OP_CONCAT:
1284 case OP_SUBST:
1285 case OP_TRANS:
1286 case OP_ANDASSIGN: /* may work later */
1287 case OP_ORASSIGN: /* may work later */
1288 return TRUE;
1289 default:
1290 return FALSE;
1291 }
1292}
1293
463ee0b2 1294OP *
8ac85365 1295refkids(OP *o, I32 type)
463ee0b2
LW		 1296{
1297 OP *kid;
11343788
MB		 1298 if (o && o->op_flags & OPf_KIDS) {
1299 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1300 ref(kid, type);
1301 }
11343788 1302 return o;
463ee0b2
LW		 1303}
1304
1305OP *
8ac85365 1306ref(OP *o, I32 type)
463ee0b2
LW		 1307{
1308 OP *kid;
463ee0b2 1309
11343788
MB		 1310 if (!o || error_count)
1311 return o;
463ee0b2 1312
11343788 1313 switch (o->op_type) {
a0d0e21e 1314 case OP_ENTERSUB:
e55aaa0e 1315 if ((type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1316 !(o->op_flags & OPf_STACKED)) {
1317 o->op_type = OP_RV2CV; /* entersub => rv2cv */
1318 o->op_ppaddr = ppaddr[OP_RV2CV];
1319 assert(cUNOPo->op_first->op_type == OP_NULL);
1320 null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
1321 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1322 }
1323 break;
aeea060c 1324
463ee0b2 1325 case OP_COND_EXPR:
11343788 1326 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1327 ref(kid, type);
1328 break;
8990e307 1329 case OP_RV2SV:
11343788 1330 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1331 /* FALL THROUGH */
1332 case OP_PADSV:
5f05dabc 1333 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1334 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1335 : type == OP_RV2HV ? OPpDEREF_HV
1336 : OPpDEREF_SV);
11343788 1337 o->op_flags |= OPf_MOD;
a0d0e21e 1338 }
8990e307
LW		 1339 break;
1340
2faa37cc 1341 case OP_THREADSV:
a863c7d1
MB		 1342 o->op_flags |= OPf_MOD; /* XXX ??? */
1343 break;
1344
463ee0b2
LW		 1345 case OP_RV2AV:
1346 case OP_RV2HV:
aeea060c 1347 o->op_flags |= OPf_REF;
8990e307 1348 /* FALL THROUGH */
463ee0b2 1349 case OP_RV2GV:
11343788 1350 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1351 break;
8990e307 1352
463ee0b2
LW		 1353 case OP_PADAV:
1354 case OP_PADHV:
aeea060c 1355 o->op_flags |= OPf_REF;
79072805 1356 break;
aeea060c 1357
8990e307 1358 case OP_SCALAR:
79072805 1359 case OP_NULL:
11343788 1360 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1361 break;
11343788 1362 ref(cBINOPo->op_first, type);
79072805
LW		 1363 break;
1364 case OP_AELEM:
1365 case OP_HELEM:
11343788 1366 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1367 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1368 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1369 : type == OP_RV2HV ? OPpDEREF_HV
1370 : OPpDEREF_SV);
11343788 1371 o->op_flags |= OPf_MOD;
8990e307 1372 }
79072805
LW		 1373 break;
1374
463ee0b2 1375 case OP_SCOPE:
79072805
LW		 1376 case OP_LEAVE:
1377 case OP_ENTER:
8990e307 1378 case OP_LIST:
11343788 1379 if (!(o->op_flags & OPf_KIDS))
79072805 1380 break;
11343788 1381 ref(cLISTOPo->op_last, type);
79072805 1382 break;
a0d0e21e
LW		 1383 default:
1384 break;
79072805 1385 }
11343788 1386 return scalar(o);
8990e307 1387
79072805
LW		 1388}
1389
1390OP *
8ac85365 1391my(OP *o)
93a17b20
LW		 1392{
1393 OP *kid;
93a17b20
LW		 1394 I32 type;
1395
11343788
MB		 1396 if (!o || error_count)
1397 return o;
93a17b20 1398
11343788 1399 type = o->op_type;
93a17b20 1400 if (type == OP_LIST) {
11343788 1401 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
93a17b20 1402 my(kid);
dab48698 1403 } else if (type == OP_UNDEF) {
7766148a 1404 return o;
dab48698 1405 } else if (type != OP_PADSV &&
93a17b20
LW		 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 {
8990e307
LW		 1591 if (dowarn && bufptr > oldbufptr && bufptr[-1] == ',') {
1592 char *s;
1593 for (s = bufptr; *s && (isALNUM(*s) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1594 if (*s == ';' || *s == '=')
8990e307
LW		 1595 warn("Parens missing around \"%s\" list", lex ? "my" : "local");
1596 }
1597 }
93a17b20 1598 in_my = FALSE;
c750a3ec 1599 in_my_stash = Nullhv;
93a17b20
LW		 1600 if (lex)
1601 return my(o);
1602 else
463ee0b2 1603 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 1604}
1605
1606OP *
8ac85365 1607jmaybe(OP *o)
79072805
LW		 1608{
1609 if (o->op_type == OP_LIST) {
554b3eca
MB		 1610 OP *o2;
1611#ifdef USE_THREADS
2faa37cc 1612 o2 = newOP(OP_THREADSV, 0);
54b9620d 1613 o2->op_targ = find_threadsv(";");
554b3eca
MB		 1614#else
1615 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
1616#endif /* USE_THREADS */
1617 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 1618 }
1619 return o;
1620}
1621
1622OP *
8ac85365 1623fold_constants(register OP *o)
79072805 1624{
11343788 1625 dTHR;
79072805
LW		 1626 register OP *curop;
1627 I32 type = o->op_type;
748a9306 1628 SV *sv;
79072805
LW		 1629
1630 if (opargs[type] & OA_RETSCALAR)
1631 scalar(o);
1632 if (opargs[type] & OA_TARGET)
ed6116ce 1633 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1634
85e6fe83 1635 if ((opargs[type] & OA_OTHERINT) && (hints & HINT_INTEGER))
a0d0e21e 1636 o->op_ppaddr = ppaddr[type = ++(o->op_type)];
85e6fe83 1637
79072805
LW		 1638 if (!(opargs[type] & OA_FOLDCONST))
1639 goto nope;
1640
de939608
CS		 1641 switch (type) {
1642 case OP_SPRINTF:
1643 case OP_UCFIRST:
1644 case OP_LCFIRST:
1645 case OP_UC:
1646 case OP_LC:
69dcf70c
MB		 1647 case OP_SLT:
1648 case OP_SGT:
1649 case OP_SLE:
1650 case OP_SGE:
1651 case OP_SCMP:
1652
de939608
CS		 1653 if (o->op_private & OPpLOCALE)
1654 goto nope;
1655 }
1656
a0d0e21e
LW		 1657 if (error_count)
1658 goto nope; /* Don't try to run w/ errors */
1659
79072805 1660 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
93a17b20
LW		 1661 if (curop->op_type != OP_CONST &&
1662 curop->op_type != OP_LIST &&
1663 curop->op_type != OP_SCALAR &&
a0d0e21e 1664 curop->op_type != OP_NULL &&
93a17b20 1665 curop->op_type != OP_PUSHMARK) {
79072805
LW		 1666 goto nope;
1667 }
1668 }
1669
1670 curop = LINKLIST(o);
1671 o->op_next = 0;
1672 op = curop;
8da795c6 1673 runops();
748a9306
LW		 1674 sv = *(stack_sp--);
1675 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 1676 pad_swipe(o->op_targ);
748a9306
LW		 1677 else if (SvTEMP(sv)) { /* grab mortal temp? */
1678 (void)SvREFCNT_inc(sv);
1679 SvTEMP_off(sv);
85e6fe83 1680 }
79072805
LW		 1681 op_free(o);
1682 if (type == OP_RV2GV)
b1cb66bf 1683 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306
LW		 1684 else {
1685 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK) {
1686 IV iv = SvIV(sv);
1687 if ((double)iv == SvNV(sv)) { /* can we smush double to int */
1688 SvREFCNT_dec(sv);
1689 sv = newSViv(iv);
1690 }
b1cb66bf 1691 else
1692 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 1693 }
1694 return newSVOP(OP_CONST, 0, sv);
1695 }
aeea060c 1696
79072805
LW		 1697 nope:
1698 if (!(opargs[type] & OA_OTHERINT))
1699 return o;
79072805 1700
85e6fe83 1701 if (!(hints & HINT_INTEGER)) {
a0d0e21e 1702 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 1703 return o;
1704
1705 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
1706 if (curop->op_type == OP_CONST) {
b1cb66bf 1707 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 1708 continue;
1709 return o;
1710 }
1711 if (opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 1712 continue;
1713 return o;
1714 }
a0d0e21e 1715 o->op_ppaddr = ppaddr[++(o->op_type)];
79072805
LW		 1716 }
1717
79072805
LW		 1718 return o;
1719}
1720
1721OP *
8ac85365 1722gen_constant_list(register OP *o)
79072805 1723{
11343788 1724 dTHR;
79072805 1725 register OP *curop;
79072805 1726 I32 oldtmps_floor = tmps_floor;
79072805 1727
a0d0e21e
LW		 1728 list(o);
1729 if (error_count)
1730 return o; /* Don't attempt to run with errors */
1731
1732 op = curop = LINKLIST(o);
1733 o->op_next = 0;
11343788 1734 pp_pushmark(ARGS);
8da795c6 1735 runops();
a0d0e21e 1736 op = curop;
11343788 1737 pp_anonlist(ARGS);
79072805 1738 tmps_floor = oldtmps_floor;
79072805
LW		 1739
1740 o->op_type = OP_RV2AV;
1741 o->op_ppaddr = ppaddr[OP_RV2AV];
79072805 1742 curop = ((UNOP*)o)->op_first;
a0d0e21e 1743 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*stack_sp--));
79072805 1744 op_free(curop);
79072805
LW		 1745 linklist(o);
1746 return list(o);
1747}
1748
1749OP *
8ac85365 1750convert(I32 type, I32 flags, OP *o)
79072805
LW		 1751{
1752 OP *kid;
a0d0e21e 1753 OP *last = 0;
79072805 1754
11343788
MB		 1755 if (!o || o->op_type != OP_LIST)
1756 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 1757 else
5dc0d613 1758 o->op_flags &= ~OPf_WANT;
79072805 1759
8990e307 1760 if (!(opargs[type] & OA_MARK))
11343788 1761 null(cLISTOPo->op_first);
8990e307 1762
11343788
MB		 1763 o->op_type = type;
1764 o->op_ppaddr = ppaddr[type];
1765 o->op_flags |= flags;
79072805 1766
11343788
MB		 1767 o = CHECKOP(type, o);
1768 if (o->op_type != type)
1769 return o;
79072805 1770
11343788 1771 if (cLISTOPo->op_children < 7) {
79072805 1772 /* XXX do we really need to do this if we're done appending?? */
11343788 1773 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805 1774 last = kid;
11343788 1775 cLISTOPo->op_last = last; /* in case check substituted last arg */
79072805
LW		 1776 }
1777
11343788 1778 return fold_constants(o);
79072805
LW		 1779}
1780
1781/* List constructors */
1782
1783OP *
8ac85365 1784append_elem(I32 type, OP *first, OP *last)
79072805
LW		 1785{
1786 if (!first)
1787 return last;
8990e307
LW		 1788
1789 if (!last)
79072805 1790 return first;
8990e307 1791
a0d0e21e
LW		 1792 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
1793 return newLISTOP(type, 0, first, last);
79072805 1794
a0d0e21e
LW		 1795 if (first->op_flags & OPf_KIDS)
1796 ((LISTOP*)first)->op_last->op_sibling = last;
1797 else {
1798 first->op_flags |= OPf_KIDS;
1799 ((LISTOP*)first)->op_first = last;
1800 }
1801 ((LISTOP*)first)->op_last = last;
1802 ((LISTOP*)first)->op_children++;
1803 return first;
79072805
LW		 1804}
1805
1806OP *
8ac85365 1807append_list(I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 1808{
1809 if (!first)
1810 return (OP*)last;
8990e307
LW		 1811
1812 if (!last)
79072805 1813 return (OP*)first;
8990e307
LW		 1814
1815 if (first->op_type != type)
79072805 1816 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 1817
1818 if (last->op_type != type)
79072805
LW		 1819 return append_elem(type, (OP*)first, (OP*)last);
1820
1821 first->op_last->op_sibling = last->op_first;
1822 first->op_last = last->op_last;
1823 first->op_children += last->op_children;
1824 if (first->op_children)
1825 last->op_flags |= OPf_KIDS;
1826
1827 Safefree(last);
1828 return (OP*)first;
1829}
1830
1831OP *
8ac85365 1832prepend_elem(I32 type, OP *first, OP *last)
79072805
LW		 1833{
1834 if (!first)
1835 return last;
8990e307
LW		 1836
1837 if (!last)
79072805 1838 return first;
8990e307
LW		 1839
1840 if (last->op_type == type) {
1841 if (type == OP_LIST) { /* already a PUSHMARK there */
1842 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
1843 ((LISTOP*)last)->op_first->op_sibling = first;
1844 }
1845 else {
1846 if (!(last->op_flags & OPf_KIDS)) {
1847 ((LISTOP*)last)->op_last = first;
1848 last->op_flags |= OPf_KIDS;
1849 }
1850 first->op_sibling = ((LISTOP*)last)->op_first;
1851 ((LISTOP*)last)->op_first = first;
79072805 1852 }
79072805
LW		 1853 ((LISTOP*)last)->op_children++;
1854 return last;
1855 }
1856
1857 return newLISTOP(type, 0, first, last);
1858}
1859
1860/* Constructors */
1861
1862OP *
8ac85365 1863newNULLLIST(void)
79072805 1864{
8990e307
LW		 1865 return newOP(OP_STUB, 0);
1866}
1867
1868OP *
8ac85365 1869force_list(OP *o)
8990e307 1870{
11343788
MB		 1871 if (!o || o->op_type != OP_LIST)
1872 o = newLISTOP(OP_LIST, 0, o, Nullop);
1873 null(o);
1874 return o;
79072805
LW		 1875}
1876
1877OP *
8ac85365 1878newLISTOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 1879{
1880 LISTOP *listop;
1881
1882 Newz(1101, listop, 1, LISTOP);
1883
1884 listop->op_type = type;
1885 listop->op_ppaddr = ppaddr[type];
1886 listop->op_children = (first != 0) + (last != 0);
1887 listop->op_flags = flags;
79072805
LW		 1888
1889 if (!last && first)
1890 last = first;
1891 else if (!first && last)
1892 first = last;
8990e307
LW		 1893 else if (first)
1894 first->op_sibling = last;
79072805
LW		 1895 listop->op_first = first;
1896 listop->op_last = last;
8990e307
LW		 1897 if (type == OP_LIST) {
1898 OP* pushop;
1899 pushop = newOP(OP_PUSHMARK, 0);
1900 pushop->op_sibling = first;
1901 listop->op_first = pushop;
1902 listop->op_flags |= OPf_KIDS;
1903 if (!last)
1904 listop->op_last = pushop;
1905 }
1906 else if (listop->op_children)
1907 listop->op_flags |= OPf_KIDS;
79072805
LW		 1908
1909 return (OP*)listop;
1910}
1911
1912OP *
8ac85365 1913newOP(I32 type, I32 flags)
79072805 1914{
11343788
MB		 1915 OP *o;
1916 Newz(1101, o, 1, OP);
1917 o->op_type = type;
1918 o->op_ppaddr = ppaddr[type];
1919 o->op_flags = flags;
79072805 1920
11343788
MB		 1921 o->op_next = o;
1922 o->op_private = 0 + (flags >> 8);
79072805 1923 if (opargs[type] & OA_RETSCALAR)
11343788 1924 scalar(o);
79072805 1925 if (opargs[type] & OA_TARGET)
11343788
MB		 1926 o->op_targ = pad_alloc(type, SVs_PADTMP);
1927 return CHECKOP(type, o);
79072805
LW		 1928}
1929
1930OP *
8ac85365 1931newUNOP(I32 type, I32 flags, OP *first)
79072805
LW		 1932{
1933 UNOP *unop;
1934
93a17b20 1935 if (!first)
aeea060c 1936 first = newOP(OP_STUB, 0);
8990e307
LW		 1937 if (opargs[type] & OA_MARK)
1938 first = force_list(first);
93a17b20 1939
79072805
LW		 1940 Newz(1101, unop, 1, UNOP);
1941 unop->op_type = type;
1942 unop->op_ppaddr = ppaddr[type];
1943 unop->op_first = first;
1944 unop->op_flags = flags | OPf_KIDS;
c07a80fd 1945 unop->op_private = 1 | (flags >> 8);
c277df42
IZ		 1946#if 1
1947 if(type == OP_STUDY && first->op_type == OP_MATCH) {
1948 first->op_type = OP_PUSHRE;
1949 first->op_ppaddr = ppaddr[OP_PUSHRE];
1950 }
1951#endif
e50aee73 1952 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 1953 if (unop->op_next)
1954 return (OP*)unop;
1955
a0d0e21e 1956 return fold_constants((OP *) unop);
79072805
LW		 1957}
1958
1959OP *
8ac85365 1960newBINOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 1961{
1962 BINOP *binop;
1963 Newz(1101, binop, 1, BINOP);
1964
1965 if (!first)
1966 first = newOP(OP_NULL, 0);
1967
1968 binop->op_type = type;
1969 binop->op_ppaddr = ppaddr[type];
1970 binop->op_first = first;
1971 binop->op_flags = flags | OPf_KIDS;
1972 if (!last) {
1973 last = first;
c07a80fd 1974 binop->op_private = 1 | (flags >> 8);
79072805
LW		 1975 }
1976 else {
c07a80fd 1977 binop->op_private = 2 | (flags >> 8);
79072805
LW		 1978 first->op_sibling = last;
1979 }
1980
e50aee73 1981 binop = (BINOP*)CHECKOP(type, binop);
79072805
LW		 1982 if (binop->op_next)
1983 return (OP*)binop;
1984
1985 binop->op_last = last = binop->op_first->op_sibling;
1986
a0d0e21e 1987 return fold_constants((OP *)binop);
79072805
LW		 1988}
1989
1990OP *
8ac85365 1991pmtrans(OP *o, OP *expr, OP *repl)
79072805 1992{
79072805
LW		 1993 SV *tstr = ((SVOP*)expr)->op_sv;
1994 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 1995 STRLEN tlen;
1996 STRLEN rlen;
ec49126f 1997 register U8 *t = (U8*)SvPV(tstr, tlen);
1998 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 1999 register I32 i;
2000 register I32 j;
8ac85365 2001 I32 Delete;
79072805 2002 I32 complement;
5d06d08e 2003 I32 squash;
79072805
LW		 2004 register short *tbl;
2005
11343788
MB		 2006 tbl = (short*)cPVOPo->op_pv;
2007 complement = o->op_private & OPpTRANS_COMPLEMENT;
8ac85365 2008 Delete = o->op_private & OPpTRANS_DELETE;
5d06d08e 2009 squash = o->op_private & OPpTRANS_SQUASH;
79072805
LW		 2010
2011 if (complement) {
2012 Zero(tbl, 256, short);
2013 for (i = 0; i < tlen; i++)
ec49126f 2014 tbl[t[i]] = -1;
79072805
LW		 2015 for (i = 0, j = 0; i < 256; i++) {
2016 if (!tbl[i]) {
2017 if (j >= rlen) {
8ac85365 2018 if (Delete)
79072805
LW		 2019 tbl[i] = -2;
2020 else if (rlen)
ec49126f 2021 tbl[i] = r[j-1];
79072805
LW		 2022 else
2023 tbl[i] = i;
2024 }
2025 else
ec49126f 2026 tbl[i] = r[j++];
79072805
LW		 2027 }
2028 }
2029 }
2030 else {
8ac85365 2031 if (!rlen && !Delete) {
79072805 2032 r = t; rlen = tlen;
5d06d08e
MB		 2033 if (!squash)
2034 o->op_private |= OPpTRANS_COUNTONLY;
79072805
LW		 2035 }
2036 for (i = 0; i < 256; i++)
2037 tbl[i] = -1;
2038 for (i = 0, j = 0; i < tlen; i++,j++) {
2039 if (j >= rlen) {
8ac85365 2040 if (Delete) {
ec49126f 2041 if (tbl[t[i]] == -1)
2042 tbl[t[i]] = -2;
79072805
LW		 2043 continue;
2044 }
2045 --j;
2046 }
ec49126f 2047 if (tbl[t[i]] == -1)
2048 tbl[t[i]] = r[j];
79072805
LW		 2049 }
2050 }
2051 op_free(expr);
2052 op_free(repl);
2053
11343788 2054 return o;
79072805
LW		 2055}
2056
2057OP *
8ac85365 2058newPMOP(I32 type, I32 flags)
79072805 2059{
11343788 2060 dTHR;
79072805
LW		 2061 PMOP *pmop;
2062
2063 Newz(1101, pmop, 1, PMOP);
2064 pmop->op_type = type;
2065 pmop->op_ppaddr = ppaddr[type];
2066 pmop->op_flags = flags;
c07a80fd 2067 pmop->op_private = 0 | (flags >> 8);
79072805 2068
36477c24 2069 if (hints & HINT_LOCALE)
2070 pmop->op_pmpermflags = (pmop->op_pmflags |= PMf_LOCALE);
2071
79072805 2072 /* link into pm list */
a0d0e21e 2073 if (type != OP_TRANS && curstash) {
79072805
LW		 2074 pmop->op_pmnext = HvPMROOT(curstash);
2075 HvPMROOT(curstash) = pmop;
2076 }
2077
2078 return (OP*)pmop;
2079}
2080
2081OP *
8ac85365 2082pmruntime(OP *o, OP *expr, OP *repl)
79072805
LW		 2083{
2084 PMOP *pm;
2085 LOGOP *rcop;
2086
11343788
MB		 2087 if (o->op_type == OP_TRANS)
2088 return pmtrans(o, expr, repl);
79072805 2089
3e3baf6d 2090 hints |= HINT_BLOCK_SCOPE;
11343788 2091 pm = (PMOP*)o;
79072805
LW		 2092
2093 if (expr->op_type == OP_CONST) {
463ee0b2 2094 STRLEN plen;
79072805 2095 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2096 char *p = SvPV(pat, plen);
11343788 2097 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2098 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2099 p = SvPV(pat, plen);
79072805
LW		 2100 pm->op_pmflags |= PMf_SKIPWHITE;
2101 }
e50aee73 2102 pm->op_pmregexp = pregcomp(p, p + plen, pm);
aeea060c 2103 if (strEQ("\\s+", pm->op_pmregexp->precomp))
85e6fe83 2104 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2105 op_free(expr);
2106 }
2107 else {
463ee0b2
LW		 2108 if (pm->op_pmflags & PMf_KEEP)
2109 expr = newUNOP(OP_REGCMAYBE,0,expr);
2110
79072805
LW		 2111 Newz(1101, rcop, 1, LOGOP);
2112 rcop->op_type = OP_REGCOMP;
2113 rcop->op_ppaddr = ppaddr[OP_REGCOMP];
2114 rcop->op_first = scalar(expr);
2115 rcop->op_flags |= OPf_KIDS;
2116 rcop->op_private = 1;
11343788 2117 rcop->op_other = o;
79072805
LW		 2118
2119 /* establish postfix order */
463ee0b2
LW		 2120 if (pm->op_pmflags & PMf_KEEP) {
2121 LINKLIST(expr);
2122 rcop->op_next = expr;
2123 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2124 }
2125 else {
2126 rcop->op_next = LINKLIST(expr);
2127 expr->op_next = (OP*)rcop;
2128 }
79072805 2129
11343788 2130 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2131 }
2132
2133 if (repl) {
748a9306
LW		 2134 OP *curop;
2135 if (pm->op_pmflags & PMf_EVAL)
2136 curop = 0;
554b3eca 2137#ifdef USE_THREADS
2faa37cc 2138 else if (repl->op_type == OP_THREADSV
554b3eca 2139 && strchr("&`'123456789+",
54b9620d 2140 threadsv_names[repl->op_targ]))
554b3eca
MB		 2141 {
2142 curop = 0;
2143 }
2144#endif /* USE_THREADS */
748a9306
LW		 2145 else if (repl->op_type == OP_CONST)
2146 curop = repl;
79072805 2147 else {
79072805
LW		 2148 OP *lastop = 0;
2149 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
2150 if (opargs[curop->op_type] & OA_DANGEROUS) {
554b3eca 2151#ifdef USE_THREADS
2faa37cc 2152 if (curop->op_type == OP_THREADSV
554b3eca
MB		 2153 && strchr("&`'123456789+", curop->op_private)) {
2154 break;
2155 }
2156#else
79072805
LW		 2157 if (curop->op_type == OP_GV) {
2158 GV *gv = ((GVOP*)curop)->op_gv;
93a17b20 2159 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 2160 break;
2161 }
554b3eca 2162#endif /* USE_THREADS */
79072805
LW		 2163 else if (curop->op_type == OP_RV2CV)
2164 break;
2165 else if (curop->op_type == OP_RV2SV ||
2166 curop->op_type == OP_RV2AV ||
2167 curop->op_type == OP_RV2HV ||
2168 curop->op_type == OP_RV2GV) {
2169 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2170 break;
2171 }
748a9306
LW		 2172 else if (curop->op_type == OP_PADSV ||
2173 curop->op_type == OP_PADAV ||
2174 curop->op_type == OP_PADHV ||
554b3eca 2175 curop->op_type == OP_PADANY) {
748a9306
LW		 2176 /* is okay */
2177 }
79072805
LW		 2178 else
2179 break;
2180 }
2181 lastop = curop;
2182 }
748a9306
LW		 2183 }
2184 if (curop == repl) {
2185 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2186 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2187 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2188 }
2189 else {
2190 Newz(1101, rcop, 1, LOGOP);
2191 rcop->op_type = OP_SUBSTCONT;
2192 rcop->op_ppaddr = ppaddr[OP_SUBSTCONT];
2193 rcop->op_first = scalar(repl);
2194 rcop->op_flags |= OPf_KIDS;
2195 rcop->op_private = 1;
11343788 2196 rcop->op_other = o;
748a9306
LW		 2197
2198 /* establish postfix order */
2199 rcop->op_next = LINKLIST(repl);
2200 repl->op_next = (OP*)rcop;
2201
2202 pm->op_pmreplroot = scalar((OP*)rcop);
2203 pm->op_pmreplstart = LINKLIST(rcop);
2204 rcop->op_next = 0;
79072805
LW		 2205 }
2206 }
2207
2208 return (OP*)pm;
2209}
2210
2211OP *
8ac85365 2212newSVOP(I32 type, I32 flags, SV *sv)
79072805
LW		 2213{
2214 SVOP *svop;
2215 Newz(1101, svop, 1, SVOP);
2216 svop->op_type = type;
2217 svop->op_ppaddr = ppaddr[type];
2218 svop->op_sv = sv;
2219 svop->op_next = (OP*)svop;
2220 svop->op_flags = flags;
2221 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2222 scalar((OP*)svop);
79072805 2223 if (opargs[type] & OA_TARGET)
ed6116ce 2224 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2225 return CHECKOP(type, svop);
79072805
LW		 2226}
2227
2228OP *
8ac85365 2229newGVOP(I32 type, I32 flags, GV *gv)
79072805 2230{
11343788 2231 dTHR;
79072805
LW		 2232 GVOP *gvop;
2233 Newz(1101, gvop, 1, GVOP);
2234 gvop->op_type = type;
2235 gvop->op_ppaddr = ppaddr[type];
8990e307 2236 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2237 gvop->op_next = (OP*)gvop;
2238 gvop->op_flags = flags;
2239 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2240 scalar((OP*)gvop);
79072805 2241 if (opargs[type] & OA_TARGET)
ed6116ce 2242 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2243 return CHECKOP(type, gvop);
79072805
LW		 2244}
2245
2246OP *
8ac85365 2247newPVOP(I32 type, I32 flags, char *pv)
79072805
LW		 2248{
2249 PVOP *pvop;
2250 Newz(1101, pvop, 1, PVOP);
2251 pvop->op_type = type;
2252 pvop->op_ppaddr = ppaddr[type];
2253 pvop->op_pv = pv;
2254 pvop->op_next = (OP*)pvop;
2255 pvop->op_flags = flags;
2256 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2257 scalar((OP*)pvop);
79072805 2258 if (opargs[type] & OA_TARGET)
ed6116ce 2259 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2260 return CHECKOP(type, pvop);
79072805
LW		 2261}
2262
79072805 2263void
8ac85365 2264package(OP *o)
79072805 2265{
11343788 2266 dTHR;
93a17b20 2267 SV *sv;
79072805
LW		 2268
2269 save_hptr(&curstash);
2270 save_item(curstname);
11343788 2271 if (o) {
463ee0b2
LW		 2272 STRLEN len;
2273 char *name;
11343788 2274 sv = cSVOPo->op_sv;
463ee0b2 2275 name = SvPV(sv, len);
b1cb66bf 2276 curstash = gv_stashpvn(name,len,TRUE);
463ee0b2 2277 sv_setpvn(curstname, name, len);
11343788 2278 op_free(o);
93a17b20
LW		 2279 }
2280 else {
2281 sv_setpv(curstname,"<none>");
2282 curstash = Nullhv;
2283 }
79072805 2284 copline = NOLINE;
8990e307 2285 expect = XSTATE;
79072805
LW		 2286}
2287
85e6fe83 2288void
8ac85365 2289utilize(int aver, I32 floor, OP *version, OP *id, OP *arg)
85e6fe83 2290{
a0d0e21e
LW		 2291 OP *pack;
2292 OP *meth;
2293 OP *rqop;
2294 OP *imop;
b1cb66bf 2295 OP *veop;
85e6fe83 2296
a0d0e21e
LW		 2297 if (id->op_type != OP_CONST)
2298 croak("Module name must be constant");
85e6fe83 2299
b1cb66bf 2300 veop = Nullop;
2301
2302 if(version != Nullop) {
2303 SV *vesv = ((SVOP*)version)->op_sv;
2304
2305 if (arg == Nullop && !SvNIOK(vesv)) {
2306 arg = version;
2307 }
2308 else {
2309 OP *pack;
2310 OP *meth;
2311
2312 if (version->op_type != OP_CONST || !SvNIOK(vesv))
2313 croak("Version number must be constant number");
2314
2315 /* Make copy of id so we don't free it twice */
2316 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2317
2318 /* Fake up a method call to VERSION */
2319 meth = newSVOP(OP_CONST, 0, newSVpv("VERSION", 7));
2320 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2321 append_elem(OP_LIST,
2322 prepend_elem(OP_LIST, pack, list(version)),
2323 newUNOP(OP_METHOD, 0, meth)));
2324 }
2325 }
aeea060c 2326
a0d0e21e 2327 /* Fake up an import/unimport */
4633a7c4
LW		 2328 if (arg && arg->op_type == OP_STUB)
2329 imop = arg; /* no import on explicit () */
b1cb66bf 2330 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2331 imop = Nullop; /* use 5.0; */
2332 }
4633a7c4
LW		 2333 else {
2334 /* Make copy of id so we don't free it twice */
2335 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4
LW		 2336 meth = newSVOP(OP_CONST, 0,
2337 aver
2338 ? newSVpv("import", 6)
2339 : newSVpv("unimport", 8)
2340 );
2341 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2342 append_elem(OP_LIST,
2343 prepend_elem(OP_LIST, pack, list(arg)),
2344 newUNOP(OP_METHOD, 0, meth)));
4633a7c4
LW		 2345 }
2346
2347 /* Fake up a require */
2348 rqop = newUNOP(OP_REQUIRE, 0, id);
a0d0e21e
LW		 2349
2350 /* Fake up the BEGIN {}, which does its thing immediately. */
c07a80fd 2351 newSUB(floor,
a0d0e21e 2352 newSVOP(OP_CONST, 0, newSVpv("BEGIN", 5)),
4633a7c4 2353 Nullop,
a0d0e21e 2354 append_elem(OP_LINESEQ,
b1cb66bf 2355 append_elem(OP_LINESEQ,
2356 newSTATEOP(0, Nullch, rqop),
2357 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2358 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2359
85e6fe83
LW		 2360 copline = NOLINE;
2361 expect = XSTATE;
2362}
2363
79072805 2364OP *
8ac85365 2365newSLICEOP(I32 flags, OP *subscript, OP *listval)
79072805
LW		 2366{
2367 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 2368 list(force_list(subscript)),
2369 list(force_list(listval)) );
79072805
LW		 2370}
2371
2372static I32
8ac85365 2373list_assignment(register OP *o)
79072805 2374{
11343788 2375 if (!o)
79072805
LW		 2376 return TRUE;
2377
11343788
MB		 2378 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
2379 o = cUNOPo->op_first;
79072805 2380
11343788
MB		 2381 if (o->op_type == OP_COND_EXPR) {
2382 I32 t = list_assignment(cCONDOPo->op_first->op_sibling);
2383 I32 f = list_assignment(cCONDOPo->op_first->op_sibling->op_sibling);
79072805
LW		 2384
2385 if (t && f)
2386 return TRUE;
2387 if (t || f)
2388 yyerror("Assignment to both a list and a scalar");
2389 return FALSE;
2390 }
2391
11343788
MB		 2392 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
2393 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
2394 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 2395 return TRUE;
2396
11343788 2397 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 2398 return TRUE;
2399
11343788 2400 if (o->op_type == OP_RV2SV)
79072805
LW		 2401 return FALSE;
2402
2403 return FALSE;
2404}
2405
2406OP *
8ac85365 2407newASSIGNOP(I32 flags, OP *left, I32 optype, OP *right)
79072805 2408{
11343788 2409 OP *o;
79072805 2410
a0d0e21e
LW		 2411 if (optype) {
2412 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
2413 return newLOGOP(optype, 0,
2414 mod(scalar(left), optype),
2415 newUNOP(OP_SASSIGN, 0, scalar(right)));
2416 }
2417 else {
2418 return newBINOP(optype, OPf_STACKED,
2419 mod(scalar(left), optype), scalar(right));
2420 }
2421 }
2422
79072805 2423 if (list_assignment(left)) {
463ee0b2 2424 modcount = 0;
748a9306 2425 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 2426 left = mod(left, OP_AASSIGN);
748a9306
LW		 2427 if (eval_start)
2428 eval_start = 0;
2429 else {
a0d0e21e
LW		 2430 op_free(left);
2431 op_free(right);
2432 return Nullop;
2433 }
11343788 2434 o = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 2435 list(force_list(right)),
2436 list(force_list(left)) );
11343788 2437 o->op_private = 0 | (flags >> 8);
a0d0e21e 2438 if (!(left->op_private & OPpLVAL_INTRO)) {
748a9306 2439 static int generation = 100;
79072805 2440 OP *curop;
11343788 2441 OP *lastop = o;
79072805 2442 generation++;
11343788 2443 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
79072805
LW		 2444 if (opargs[curop->op_type] & OA_DANGEROUS) {
2445 if (curop->op_type == OP_GV) {
2446 GV *gv = ((GVOP*)curop)->op_gv;
2447 if (gv == defgv || SvCUR(gv) == generation)
2448 break;
2449 SvCUR(gv) = generation;
2450 }
748a9306
LW		 2451 else if (curop->op_type == OP_PADSV ||
2452 curop->op_type == OP_PADAV ||
2453 curop->op_type == OP_PADHV ||
2454 curop->op_type == OP_PADANY) {
2455 SV **svp = AvARRAY(comppad_name);
8e07c86e 2456 SV *sv = svp[curop->op_targ];
748a9306
LW		 2457 if (SvCUR(sv) == generation)
2458 break;
2459 SvCUR(sv) = generation; /* (SvCUR not used any more) */
2460 }
79072805
LW		 2461 else if (curop->op_type == OP_RV2CV)
2462 break;
2463 else if (curop->op_type == OP_RV2SV ||
2464 curop->op_type == OP_RV2AV ||
2465 curop->op_type == OP_RV2HV ||
2466 curop->op_type == OP_RV2GV) {
2467 if (lastop->op_type != OP_GV) /* funny deref? */
2468 break;
2469 }
2470 else
2471 break;
2472 }
2473 lastop = curop;
2474 }
11343788
MB		 2475 if (curop != o)
2476 o->op_private = OPpASSIGN_COMMON;
79072805 2477 }
c07a80fd 2478 if (right && right->op_type == OP_SPLIT) {
2479 OP* tmpop;
2480 if ((tmpop = ((LISTOP*)right)->op_first) &&
2481 tmpop->op_type == OP_PUSHRE)
2482 {
2483 PMOP *pm = (PMOP*)tmpop;
2484 if (left->op_type == OP_RV2AV &&
2485 !(left->op_private & OPpLVAL_INTRO) &&
11343788 2486 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 2487 {
2488 tmpop = ((UNOP*)left)->op_first;
2489 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
2490 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
2491 pm->op_pmflags |= PMf_ONCE;
11343788 2492 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 2493 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
2494 tmpop->op_sibling = Nullop; /* don't free split */
2495 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 2496 op_free(o); /* blow off assign */
54310121 2497 right->op_flags &= ~OPf_WANT;
a5f75d66 2498 /* "I don't know and I don't care." */
c07a80fd 2499 return right;
2500 }
2501 }
2502 else {
2503 if (modcount < 10000 &&
2504 ((LISTOP*)right)->op_last->op_type == OP_CONST)
2505 {
2506 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
2507 if (SvIVX(sv) == 0)
2508 sv_setiv(sv, modcount+1);
2509 }
2510 }
2511 }
2512 }
11343788 2513 return o;
79072805
LW		 2514 }
2515 if (!right)
2516 right = newOP(OP_UNDEF, 0);
2517 if (right->op_type == OP_READLINE) {
2518 right->op_flags |= OPf_STACKED;
463ee0b2 2519 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 2520 }
a0d0e21e 2521 else {
748a9306 2522 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 2523 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 2524 scalar(right), mod(scalar(left), OP_SASSIGN) );
748a9306
LW		 2525 if (eval_start)
2526 eval_start = 0;
2527 else {
11343788 2528 op_free(o);
a0d0e21e
LW		 2529 return Nullop;
2530 }
2531 }
11343788 2532 return o;
79072805
LW		 2533}
2534
2535OP *
8ac85365 2536newSTATEOP(I32 flags, char *label, OP *o)
79072805 2537{
11343788 2538 dTHR;
bbce6d69 2539 U32 seq = intro_my();
79072805
LW		 2540 register COP *cop;
2541
2542 Newz(1101, cop, 1, COP);
84902520 2543 if (PERLDB_LINE && curcop->cop_line && curstash != debstash) {
8990e307
LW		 2544 cop->op_type = OP_DBSTATE;
2545 cop->op_ppaddr = ppaddr[ OP_DBSTATE ];
2546 }
2547 else {
2548 cop->op_type = OP_NEXTSTATE;
2549 cop->op_ppaddr = ppaddr[ OP_NEXTSTATE ];
2550 }
79072805 2551 cop->op_flags = flags;
c07a80fd 2552 cop->op_private = 0 | (flags >> 8);
ff0cee69 2553#ifdef NATIVE_HINTS
2554 cop->op_private |= NATIVE_HINTS;
2555#endif
79072805
LW		 2556 cop->op_next = (OP*)cop;
2557
463ee0b2
LW		 2558 if (label) {
2559 cop->cop_label = label;
85e6fe83 2560 hints |= HINT_BLOCK_SCOPE;
463ee0b2 2561 }
bbce6d69 2562 cop->cop_seq = seq;
a0d0e21e 2563 cop->cop_arybase = curcop->cop_arybase;
79072805
LW		 2564
2565 if (copline == NOLINE)
2566 cop->cop_line = curcop->cop_line;
2567 else {
2568 cop->cop_line = copline;
2569 copline = NOLINE;
2570 }
44a8e56a 2571 cop->cop_filegv = (GV*)SvREFCNT_inc(curcop->cop_filegv);
79072805
LW		 2572 cop->cop_stash = curstash;
2573
84902520 2574 if (PERLDB_LINE && curstash != debstash) {
93a17b20
LW		 2575 SV **svp = av_fetch(GvAV(curcop->cop_filegv),(I32)cop->cop_line, FALSE);
2576 if (svp && *svp != &sv_undef && !SvIOK(*svp)) {
a0d0e21e 2577 (void)SvIOK_on(*svp);
a5f75d66 2578 SvIVX(*svp) = 1;
93a17b20
LW		 2579 SvSTASH(*svp) = (HV*)cop;
2580 }
2581 }
2582
11343788 2583 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 2584}
2585
bbce6d69 2586/* "Introduce" my variables to visible status. */
2587U32
8ac85365 2588intro_my(void)
bbce6d69 2589{
2590 SV **svp;
2591 SV *sv;
2592 I32 i;
2593
2594 if (! min_intro_pending)
2595 return cop_seqmax;
2596
2597 svp = AvARRAY(comppad_name);
2598 for (i = min_intro_pending; i <= max_intro_pending; i++) {
2599 if ((sv = svp[i]) && sv != &sv_undef && !SvIVX(sv)) {
2600 SvIVX(sv) = 999999999; /* Don't know scope end yet. */
2601 SvNVX(sv) = (double)cop_seqmax;
2602 }
2603 }
2604 min_intro_pending = 0;
2605 comppad_name_fill = max_intro_pending; /* Needn't search higher */
2606 return cop_seqmax++;
2607}
2608
79072805 2609OP *
8ac85365 2610newLOGOP(I32 type, I32 flags, OP *first, OP *other)
79072805 2611{
883ffac3
CS		 2612 return new_logop(type, flags, &first, &other);
2613}
2614
2615static OP *
2616new_logop(I32 type, I32 flags, OP** firstp, OP** otherp)
2617{
11343788 2618 dTHR;
79072805 2619 LOGOP *logop;
11343788 2620 OP *o;
883ffac3
CS		 2621 OP *first = *firstp;
2622 OP *other = *otherp;
79072805 2623
a0d0e21e
LW		 2624 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
2625 return newBINOP(type, flags, scalar(first), scalar(other));
2626
8990e307 2627 scalarboolean(first);
79072805
LW		 2628 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
2629 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
2630 if (type == OP_AND || type == OP_OR) {
2631 if (type == OP_AND)
2632 type = OP_OR;
2633 else
2634 type = OP_AND;
11343788 2635 o = first;
883ffac3 2636 first = *firstp = cUNOPo->op_first;
11343788
MB		 2637 if (o->op_next)
2638 first->op_next = o->op_next;
2639 cUNOPo->op_first = Nullop;
2640 op_free(o);
79072805
LW		 2641 }
2642 }
2643 if (first->op_type == OP_CONST) {
93a17b20 2644 if (dowarn && (first->op_private & OPpCONST_BARE))
c07a80fd 2645 warn("Probable precedence problem on %s", op_desc[type]);
79072805
LW		 2646 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
2647 op_free(first);
883ffac3 2648 *firstp = Nullop;
79072805
LW		 2649 return other;
2650 }
2651 else {
2652 op_free(other);
883ffac3 2653 *otherp = Nullop;
79072805
LW		 2654 return first;
2655 }
2656 }
2657 else if (first->op_type == OP_WANTARRAY) {
2658 if (type == OP_AND)
2659 list(other);
2660 else
2661 scalar(other);
2662 }
a6006777 2663 else if (dowarn && (first->op_flags & OPf_KIDS)) {
2664 OP *k1 = ((UNOP*)first)->op_first;
2665 OP *k2 = k1->op_sibling;
2666 OPCODE warnop = 0;
2667 switch (first->op_type)
2668 {
2669 case OP_NULL:
2670 if (k2 && k2->op_type == OP_READLINE
2671 && (k2->op_flags & OPf_STACKED)
2672 && (k1->op_type == OP_RV2SV || k1->op_type == OP_PADSV))
2673 warnop = k2->op_type;
2674 break;
2675
2676 case OP_SASSIGN:
68dc0745 2677 if (k1->op_type == OP_READDIR
2678 || k1->op_type == OP_GLOB
2679 || k1->op_type == OP_EACH)
a6006777 2680 warnop = k1->op_type;
2681 break;
2682 }
8ebc5c01 2683 if (warnop) {
2684 line_t oldline = curcop->cop_line;
2685 curcop->cop_line = copline;
68dc0745 2686 warn("Value of %s%s can be \"0\"; test with defined()",
2687 op_desc[warnop],
2688 ((warnop == OP_READLINE || warnop == OP_GLOB)
2689 ? " construct" : "() operator"));
2690 curcop->cop_line = oldline;
8ebc5c01 2691 }
a6006777 2692 }
79072805
LW		 2693
2694 if (!other)
2695 return first;
2696
a0d0e21e
LW		 2697 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
2698 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
2699
79072805
LW		 2700 Newz(1101, logop, 1, LOGOP);
2701
2702 logop->op_type = type;
2703 logop->op_ppaddr = ppaddr[type];
2704 logop->op_first = first;
2705 logop->op_flags = flags | OPf_KIDS;
2706 logop->op_other = LINKLIST(other);
c07a80fd 2707 logop->op_private = 1 | (flags >> 8);
79072805
LW		 2708
2709 /* establish postfix order */
2710 logop->op_next = LINKLIST(first);
2711 first->op_next = (OP*)logop;
2712 first->op_sibling = other;
2713
11343788
MB		 2714 o = newUNOP(OP_NULL, 0, (OP*)logop);
2715 other->op_next = o;
79072805 2716
11343788 2717 return o;
79072805
LW		 2718}
2719
2720OP *
8ac85365 2721newCONDOP(I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 2722{
11343788 2723 dTHR;
79072805 2724 CONDOP *condop;
11343788 2725 OP *o;
79072805 2726
b1cb66bf 2727 if (!falseop)
2728 return newLOGOP(OP_AND, 0, first, trueop);
2729 if (!trueop)
2730 return newLOGOP(OP_OR, 0, first, falseop);
79072805 2731
8990e307 2732 scalarboolean(first);
79072805
LW		 2733 if (first->op_type == OP_CONST) {
2734 if (SvTRUE(((SVOP*)first)->op_sv)) {
2735 op_free(first);
b1cb66bf 2736 op_free(falseop);
2737 return trueop;
79072805
LW		 2738 }
2739 else {
2740 op_free(first);
b1cb66bf 2741 op_free(trueop);
2742 return falseop;
79072805
LW		 2743 }
2744 }
2745 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 2746 list(trueop);
2747 scalar(falseop);
79072805
LW		 2748 }
2749 Newz(1101, condop, 1, CONDOP);
2750
2751 condop->op_type = OP_COND_EXPR;
2752 condop->op_ppaddr = ppaddr[OP_COND_EXPR];
2753 condop->op_first = first;
2754 condop->op_flags = flags | OPf_KIDS;
b1cb66bf 2755 condop->op_true = LINKLIST(trueop);
2756 condop->op_false = LINKLIST(falseop);
c07a80fd 2757 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2758
2759 /* establish postfix order */
2760 condop->op_next = LINKLIST(first);
2761 first->op_next = (OP*)condop;
2762
b1cb66bf 2763 first->op_sibling = trueop;
2764 trueop->op_sibling = falseop;
11343788 2765 o = newUNOP(OP_NULL, 0, (OP*)condop);
79072805 2766
5dc0d613
MB		 2767 trueop->op_next = o;
2768 falseop->op_next = o;
79072805 2769
11343788 2770 return o;
79072805
LW		 2771}
2772
2773OP *
8ac85365 2774newRANGE(I32 flags, OP *left, OP *right)
79072805 2775{
b35b2403 2776 dTHR;
79072805
LW		 2777 CONDOP *condop;
2778 OP *flip;
2779 OP *flop;
11343788 2780 OP *o;
79072805
LW		 2781
2782 Newz(1101, condop, 1, CONDOP);
2783
2784 condop->op_type = OP_RANGE;
2785 condop->op_ppaddr = ppaddr[OP_RANGE];
2786 condop->op_first = left;
2787 condop->op_flags = OPf_KIDS;
2788 condop->op_true = LINKLIST(left);
2789 condop->op_false = LINKLIST(right);
c07a80fd 2790 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2791
2792 left->op_sibling = right;
2793
2794 condop->op_next = (OP*)condop;
2795 flip = newUNOP(OP_FLIP, flags, (OP*)condop);
2796 flop = newUNOP(OP_FLOP, 0, flip);
11343788 2797 o = newUNOP(OP_NULL, 0, flop);
79072805
LW		 2798 linklist(flop);
2799
2800 left->op_next = flip;
2801 right->op_next = flop;
2802
ed6116ce 2803 condop->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805 2804 sv_upgrade(PAD_SV(condop->op_targ), SVt_PVNV);
ed6116ce 2805 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 2806 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
2807
2808 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2809 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2810
11343788 2811 flip->op_next = o;
79072805 2812 if (!flip->op_private || !flop->op_private)
11343788 2813 linklist(o); /* blow off optimizer unless constant */
79072805 2814
11343788 2815 return o;
79072805
LW		 2816}
2817
2818OP *
8ac85365 2819newLOOPOP(I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 2820{
11343788 2821 dTHR;
463ee0b2 2822 OP* listop;
11343788 2823 OP* o;
463ee0b2 2824 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 2825 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 2826
463ee0b2
LW		 2827 if (expr) {
2828 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
2829 return block; /* do {} while 0 does once */
fb73857a 2830 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
2831 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 2832 expr = newUNOP(OP_DEFINED, 0,
54b9620d 2833 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
774d564b 2834 }
463ee0b2 2835 }
93a17b20 2836
8990e307 2837 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 2838 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 2839
883ffac3
CS		 2840 if (listop)
2841 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 2842
11343788
MB		 2843 if (once && o != listop)
2844 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 2845
11343788
MB		 2846 if (o == listop)
2847 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 2848
11343788
MB		 2849 o->op_flags |= flags;
2850 o = scope(o);
2851 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
2852 return o;
79072805
LW		 2853}
2854
2855OP *
8ac85365 2856newWHILEOP(I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805 2857{
11343788 2858 dTHR;
79072805
LW		 2859 OP *redo;
2860 OP *next = 0;
2861 OP *listop;
11343788 2862 OP *o;
79072805
LW		 2863 OP *condop;
2864
fb73857a 2865 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
2866 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 2867 expr = newUNOP(OP_DEFINED, 0,
54b9620d 2868 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
748a9306 2869 }
79072805
LW		 2870
2871 if (!block)
2872 block = newOP(OP_NULL, 0);
2873
2874 if (cont)
2875 next = LINKLIST(cont);
fb73857a 2876 if (expr) {
79072805 2877 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
fb73857a 2878 if ((line_t)whileline != NOLINE) {
2879 copline = whileline;
2880 cont = append_elem(OP_LINESEQ, cont,
2881 newSTATEOP(0, Nullch, Nullop));
2882 }
2883 }
79072805 2884
463ee0b2 2885 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 2886 redo = LINKLIST(listop);
2887
2888 if (expr) {
883ffac3
CS		 2889 copline = whileline;
2890 scalar(listop);
2891 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 2892 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 2893 op_free(expr); /* oops, it's a while (0) */
463ee0b2 2894 op_free((OP*)loop);
883ffac3 2895 return Nullop; /* listop already freed by new_logop */
463ee0b2 2896 }
883ffac3
CS		 2897 if (listop)
2898 ((LISTOP*)listop)->op_last->op_next = condop =
2899 (o == listop ? redo : LINKLIST(o));
79072805
LW		 2900 if (!next)
2901 next = condop;
2902 }
2903 else
11343788 2904 o = listop;
79072805
LW		 2905
2906 if (!loop) {
2907 Newz(1101,loop,1,LOOP);
2908 loop->op_type = OP_ENTERLOOP;
2909 loop->op_ppaddr = ppaddr[OP_ENTERLOOP];
2910 loop->op_private = 0;
2911 loop->op_next = (OP*)loop;
2912 }
2913
11343788 2914 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 2915
2916 loop->op_redoop = redo;
11343788 2917 loop->op_lastop = o;
79072805
LW		 2918
2919 if (next)
2920 loop->op_nextop = next;
2921 else
11343788 2922 loop->op_nextop = o;
79072805 2923
11343788
MB		 2924 o->op_flags |= flags;
2925 o->op_private |= (flags >> 8);
2926 return o;
79072805
LW		 2927}
2928
2929OP *
8990e307 2930newFOROP(I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
79072805
LW		 2931{
2932 LOOP *loop;
fb73857a 2933 OP *wop;
85e6fe83 2934 int padoff = 0;
4633a7c4 2935 I32 iterflags = 0;
79072805 2936
79072805 2937 if (sv) {
85e6fe83 2938 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306
LW		 2939 sv->op_type = OP_RV2GV;
2940 sv->op_ppaddr = ppaddr[OP_RV2GV];
79072805 2941 }
85e6fe83
LW		 2942 else if (sv->op_type == OP_PADSV) { /* private variable */
2943 padoff = sv->op_targ;
2944 op_free(sv);
2945 sv = Nullop;
2946 }
54b9620d
MB		 2947 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
2948 padoff = sv->op_targ;
2949 iterflags |= OPf_SPECIAL;
2950 op_free(sv);
2951 sv = Nullop;
2952 }
79072805 2953 else
c07a80fd 2954 croak("Can't use %s for loop variable", op_desc[sv->op_type]);
79072805
LW		 2955 }
2956 else {
54b9620d
MB		 2957#ifdef USE_THREADS
2958 padoff = find_threadsv("_");
2959 iterflags |= OPf_SPECIAL;
2960#else
79072805 2961 sv = newGVOP(OP_GV, 0, defgv);
54b9620d 2962#endif
79072805 2963 }
5f05dabc 2964 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
4633a7c4
LW		 2965 expr = scalar(ref(expr, OP_ITER));
2966 iterflags |= OPf_STACKED;
2967 }
2968 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
a0d0e21e
LW		 2969 append_elem(OP_LIST, mod(force_list(expr), OP_GREPSTART),
2970 scalar(sv))));
85e6fe83
LW		 2971 assert(!loop->op_next);
2972 Renew(loop, 1, LOOP);
2973 loop->op_targ = padoff;
fb73857a 2974 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont);
2975 copline = forline;
2976 return newSTATEOP(0, label, wop);
79072805
LW		 2977}
2978
8990e307 2979OP*
8ac85365 2980newLOOPEX(I32 type, OP *label)
8990e307 2981{
11343788
MB		 2982 dTHR;
2983 OP *o;
8990e307 2984 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 2985 /* "last()" means "last" */
2986 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
2987 o = newOP(type, OPf_SPECIAL);
2988 else {
2989 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
2990 ? SvPVx(((SVOP*)label)->op_sv, na)
2991 : ""));
2992 }
8990e307
LW		 2993 op_free(label);
2994 }
2995 else {
a0d0e21e
LW		 2996 if (label->op_type == OP_ENTERSUB)
2997 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 2998 o = newUNOP(type, OPf_STACKED, label);
8990e307 2999 }
85e6fe83 3000 hints |= HINT_BLOCK_SCOPE;
11343788 3001 return o;
8990e307
LW		 3002}
3003
79072805 3004void
8ac85365 3005cv_undef(CV *cv)
79072805 3006{
11343788
MB		 3007 dTHR;
3008#ifdef USE_THREADS
e858de61
MB		 3009 if (CvMUTEXP(cv)) {
3010 MUTEX_DESTROY(CvMUTEXP(cv));
3011 Safefree(CvMUTEXP(cv));
3012 CvMUTEXP(cv) = 0;
3013 }
11343788
MB		 3014#endif /* USE_THREADS */
3015
a0d0e21e 3016 if (!CvXSUB(cv) && CvROOT(cv)) {
11343788
MB		 3017#ifdef USE_THREADS
3018 if (CvDEPTH(cv) || (CvOWNER(cv) && CvOWNER(cv) != thr))
3019 croak("Can't undef active subroutine");
3020#else
a0d0e21e
LW		 3021 if (CvDEPTH(cv))
3022 croak("Can't undef active subroutine");
11343788 3023#endif /* USE_THREADS */
8990e307 3024 ENTER;
a0d0e21e
LW		 3025
3026 SAVESPTR(curpad);
3027 curpad = 0;
3028
a5f75d66 3029 if (!CvCLONED(cv))
748a9306 3030 op_free(CvROOT(cv));
79072805 3031 CvROOT(cv) = Nullop;
8990e307 3032 LEAVE;
79072805 3033 }
1d5db326 3034 SvPOK_off((SV*)cv); /* forget prototype */
44a8e56a 3035 CvFLAGS(cv) = 0;
8e07c86e
AD		 3036 SvREFCNT_dec(CvGV(cv));
3037 CvGV(cv) = Nullgv;
3038 SvREFCNT_dec(CvOUTSIDE(cv));
3039 CvOUTSIDE(cv) = Nullcv;
3040 if (CvPADLIST(cv)) {
8ebc5c01 3041 /* may be during global destruction */
3042 if (SvREFCNT(CvPADLIST(cv))) {
93965878 3043 I32 i = AvFILLp(CvPADLIST(cv));
8ebc5c01 3044 while (i >= 0) {
3045 SV** svp = av_fetch(CvPADLIST(cv), i--, FALSE);
46fc3d4c 3046 SV* sv = svp ? *svp : Nullsv;
3047 if (!sv)
3048 continue;
3049 if (sv == (SV*)comppad_name)
3050 comppad_name = Nullav;
3051 else if (sv == (SV*)comppad) {
3052 comppad = Nullav;
3053 curpad = Null(SV**);
3054 }
3055 SvREFCNT_dec(sv);
8ebc5c01 3056 }
3057 SvREFCNT_dec((SV*)CvPADLIST(cv));
8e07c86e 3058 }
8e07c86e
AD		 3059 CvPADLIST(cv) = Nullav;
3060 }
79072805
LW		 3061}
3062
5f05dabc 3063#ifdef DEBUG_CLOSURES
3064static void
3065cv_dump(cv)
3066CV* cv;
3067{
3068 CV *outside = CvOUTSIDE(cv);
3069 AV* padlist = CvPADLIST(cv);
4fdae800 3070 AV* pad_name;
3071 AV* pad;
3072 SV** pname;
3073 SV** ppad;
5f05dabc 3074 I32 ix;
3075
fb73857a 3076 PerlIO_printf(Perl_debug_log, "\tCV=0x%lx (%s), OUTSIDE=0x%lx (%s)\n",
ab50184a
CS		 3077 cv,
3078 (CvANON(cv) ? "ANON"
3079 : (cv == main_cv) ? "MAIN"
07055b4c 3080 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3081 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
ab50184a
CS		 3082 outside,
3083 (!outside ? "null"
3084 : CvANON(outside) ? "ANON"
3085 : (outside == main_cv) ? "MAIN"
07055b4c 3086 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3087 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
5f05dabc 3088
4fdae800 3089 if (!padlist)
3090 return;
3091
3092 pad_name = (AV*)*av_fetch(padlist, 0, FALSE);
3093 pad = (AV*)*av_fetch(padlist, 1, FALSE);
3094 pname = AvARRAY(pad_name);
3095 ppad = AvARRAY(pad);
3096
93965878 3097 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
5f05dabc 3098 if (SvPOK(pname[ix]))
fb73857a 3099 PerlIO_printf(Perl_debug_log, "\t%4d. 0x%lx (%s\"%s\" %ld-%ld)\n",
4fdae800 3100 ix, ppad[ix],
3101 SvFAKE(pname[ix]) ? "FAKE " : "",
3102 SvPVX(pname[ix]),
ab50184a
CS		 3103 (long)I_32(SvNVX(pname[ix])),
3104 (long)SvIVX(pname[ix]));
5f05dabc 3105 }
3106}
3107#endif /* DEBUG_CLOSURES */
3108
3109static CV *
8ac85365 3110cv_clone2(CV *proto, CV *outside)
748a9306 3111{
11343788 3112 dTHR;
748a9306
LW		 3113 AV* av;
3114 I32 ix;
3115 AV* protopadlist = CvPADLIST(proto);
3116 AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
3117 AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
5f05dabc 3118 SV** pname = AvARRAY(protopad_name);
3119 SV** ppad = AvARRAY(protopad);
93965878
NIS		 3120 I32 fname = AvFILLp(protopad_name);
3121 I32 fpad = AvFILLp(protopad);
748a9306
LW		 3122 AV* comppadlist;
3123 CV* cv;
3124
07055b4c
CS		 3125 assert(!CvUNIQUE(proto));
3126
748a9306
LW		 3127 ENTER;
3128 SAVESPTR(curpad);
3129 SAVESPTR(comppad);
46fc3d4c 3130 SAVESPTR(comppad_name);
748a9306
LW		 3131 SAVESPTR(compcv);
3132
3133 cv = compcv = (CV*)NEWSV(1104,0);
fa83b5b6 3134 sv_upgrade((SV *)cv, SvTYPE(proto));
a5f75d66 3135 CvCLONED_on(cv);
5f05dabc 3136 if (CvANON(proto))
3137 CvANON_on(cv);
748a9306 3138
11343788 3139#ifdef USE_THREADS
12ca11f6 3140 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3141 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3142 CvOWNER(cv) = 0;
3143#endif /* USE_THREADS */
748a9306 3144 CvFILEGV(cv) = CvFILEGV(proto);
44a8e56a 3145 CvGV(cv) = (GV*)SvREFCNT_inc(CvGV(proto));
748a9306
LW		 3146 CvSTASH(cv) = CvSTASH(proto);
3147 CvROOT(cv) = CvROOT(proto);
3148 CvSTART(cv) = CvSTART(proto);
5f05dabc 3149 if (outside)
3150 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
748a9306 3151
68dc0745 3152 if (SvPOK(proto))
3153 sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto));
3154
46fc3d4c 3155 comppad_name = newAV();
3156 for (ix = fname; ix >= 0; ix--)
3157 av_store(comppad_name, ix, SvREFCNT_inc(pname[ix]));
748a9306
LW		 3158
3159 comppad = newAV();
3160
3161 comppadlist = newAV();
3162 AvREAL_off(comppadlist);
46fc3d4c 3163 av_store(comppadlist, 0, (SV*)comppad_name);
b355b4e0 3164 av_store(comppadlist, 1, (SV*)comppad);
748a9306 3165 CvPADLIST(cv) = comppadlist;
93965878 3166 av_fill(comppad, AvFILLp(protopad));
748a9306
LW		 3167 curpad = AvARRAY(comppad);
3168
3169 av = newAV(); /* will be @_ */
3170 av_extend(av, 0);
3171 av_store(comppad, 0, (SV*)av);
3172 AvFLAGS(av) = AVf_REIFY;
3173
9607fc9c 3174 for (ix = fpad; ix > 0; ix--) {
3175 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3176 if (namesv && namesv != &sv_undef) {
3177 char *name = SvPVX(namesv); /* XXX */
3178 if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */
3179 I32 off = pad_findlex(name, ix, SvIVX(namesv),
5f05dabc 3180 CvOUTSIDE(cv), cxstack_ix);
3181 if (!off)
3182 curpad[ix] = SvREFCNT_inc(ppad[ix]);
3183 else if (off != ix)
748a9306
LW		 3184 croak("panic: cv_clone: %s", name);
3185 }
3186 else { /* our own lexical */
aa689395 3187 SV* sv;
5f05dabc 3188 if (*name == '&') {
3189 /* anon code -- we'll come back for it */
3190 sv = SvREFCNT_inc(ppad[ix]);
3191 }
3192 else if (*name == '@')
3193 sv = (SV*)newAV();
748a9306 3194 else if (*name == '%')
5f05dabc 3195 sv = (SV*)newHV();
748a9306 3196 else
5f05dabc 3197 sv = NEWSV(0,0);
3198 if (!SvPADBUSY(sv))
3199 SvPADMY_on(sv);
3200 curpad[ix] = sv;
748a9306
LW		 3201 }
3202 }
3203 else {
aa689395 3204 SV* sv = NEWSV(0,0);
748a9306 3205 SvPADTMP_on(sv);
5f05dabc 3206 curpad[ix] = sv;
748a9306
LW		 3207 }
3208 }
3209
5f05dabc 3210 /* Now that vars are all in place, clone nested closures. */
3211
9607fc9c 3212 for (ix = fpad; ix > 0; ix--) {
3213 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3214 if (namesv
3215 && namesv != &sv_undef
3216 && !(SvFLAGS(namesv) & SVf_FAKE)
3217 && *SvPVX(namesv) == '&'
5f05dabc 3218 && CvCLONE(ppad[ix]))
3219 {
3220 CV *kid = cv_clone2((CV*)ppad[ix], cv);
3221 SvREFCNT_dec(ppad[ix]);
3222 CvCLONE_on(kid);
3223 SvPADMY_on(kid);
3224 curpad[ix] = (SV*)kid;
748a9306
LW		 3225 }
3226 }
3227
5f05dabc 3228#ifdef DEBUG_CLOSURES
ab50184a
CS		 3229 PerlIO_printf(Perl_debug_log, "Cloned inside:\n");
3230 cv_dump(outside);
3231 PerlIO_printf(Perl_debug_log, " from:\n");
5f05dabc 3232 cv_dump(proto);
ab50184a 3233 PerlIO_printf(Perl_debug_log, " to:\n");
5f05dabc 3234 cv_dump(cv);
3235#endif
3236
748a9306
LW		 3237 LEAVE;
3238 return cv;
3239}
3240
3241CV *
8ac85365 3242cv_clone(CV *proto)
5f05dabc 3243{
3244 return cv_clone2(proto, CvOUTSIDE(proto));
3245}
3246
3fe9a6f1 3247void
8ac85365 3248cv_ckproto(CV *cv, GV *gv, char *p)
3fe9a6f1 3249{
3250 if ((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX(cv)))) {
46fc3d4c 3251 SV* msg = sv_newmortal();
3fe9a6f1 3252 SV* name = Nullsv;
3253
3254 if (gv)
46fc3d4c 3255 gv_efullname3(name = sv_newmortal(), gv, Nullch);
3256 sv_setpv(msg, "Prototype mismatch:");
3257 if (name)
fc36a67e 3258 sv_catpvf(msg, " sub %_", name);
3fe9a6f1 3259 if (SvPOK(cv))
46fc3d4c 3260 sv_catpvf(msg, " (%s)", SvPVX(cv));
3261 sv_catpv(msg, " vs ");
3262 if (p)
3263 sv_catpvf(msg, "(%s)", p);
3264 else
3265 sv_catpv(msg, "none");
fc36a67e 3266 warn("%_", msg);
3fe9a6f1 3267 }
3268}
3269
760ac839 3270SV *
8ac85365 3271cv_const_sv(CV *cv)
760ac839
LW		 3272{
3273 OP *o;
54310121 3274 SV *sv;
aeea060c 3275
54310121 3276 if (!cv || !SvPOK(cv) || SvCUR(cv))
3277 return Nullsv;
760ac839 3278
54310121 3279 sv = Nullsv;
3280 for (o = CvSTART(cv); o; o = o->op_next) {
3281 OPCODE type = o->op_type;
3282
3283 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
3284 continue;
3285 if (type == OP_LEAVESUB || type == OP_RETURN)
3286 break;
3287 if (sv)
3288 return Nullsv;
3289 if (type == OP_CONST)
5dc0d613 3290 sv = cSVOPo->op_sv;
54310121 3291 else if (type == OP_PADSV) {
e858de61
MB		 3292 AV* padav = (AV*)(AvARRAY(CvPADLIST(cv))[1]);
3293 sv = padav ? AvARRAY(padav)[o->op_targ] : Nullsv;
5aabfad6 3294 if (!sv || (!SvREADONLY(sv) && SvREFCNT(sv) > 1))
54310121 3295 return Nullsv;
760ac839 3296 }
54310121 3297 else
3298 return Nullsv;
760ac839 3299 }
5aabfad6 3300 if (sv)
3301 SvREADONLY_on(sv);
760ac839
LW		 3302 return sv;
3303}
3304
748a9306 3305CV *
8ac85365 3306newSUB(I32 floor, OP *o, OP *proto, OP *block)
79072805 3307{
11343788 3308 dTHR;
5dc0d613 3309 char *name = o ? SvPVx(cSVOPo->op_sv, na) : Nullch;
44a8e56a 3310 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
3fe9a6f1 3311 char *ps = proto ? SvPVx(((SVOP*)proto)->op_sv, na) : Nullch;
79072805 3312 register CV *cv;
a0d0e21e 3313 I32 ix;
79072805 3314
11343788 3315 if (o)
5dc0d613 3316 SAVEFREEOP(o);
3fe9a6f1 3317 if (proto)
3318 SAVEFREEOP(proto);
3319
68dc0745 3320 if (!name || GvCVGEN(gv))
3321 cv = Nullcv;
3322 else if (cv = GvCV(gv)) {
3fe9a6f1 3323 cv_ckproto(cv, gv, ps);
68dc0745 3324 /* already defined (or promised)? */
3325 if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3326 SV* const_sv;
aa689395 3327 if (!block) {
3328 /* just a "sub foo;" when &foo is already defined */
3329 SAVEFREESV(compcv);
3330 goto done;
3331 }
7bac28a0 3332 /* ahem, death to those who redefine active sort subs */
3333 if (curstack == sortstack && sortcop == CvSTART(cv))
3334 croak("Can't redefine active sort subroutine %s", name);
68dc0745 3335 const_sv = cv_const_sv(cv);
2f34f9d4
IZ		 3336 if (const_sv || dowarn && !(CvGV(cv) && GvSTASH(CvGV(cv))
3337 && HvNAME(GvSTASH(CvGV(cv)))
3338 && strEQ(HvNAME(GvSTASH(CvGV(cv))),
3339 "autouse"))) {
79072805 3340 line_t oldline = curcop->cop_line;
79072805 3341 curcop->cop_line = copline;
760ac839 3342 warn(const_sv ? "Constant subroutine %s redefined"
68dc0745 3343 : "Subroutine %s redefined", name);
79072805
LW		 3344 curcop->cop_line = oldline;
3345 }
8990e307 3346 SvREFCNT_dec(cv);
68dc0745 3347 cv = Nullcv;
79072805
LW		 3348 }
3349 }
a0d0e21e 3350 if (cv) { /* must reuse cv if autoloaded */
4633a7c4 3351 cv_undef(cv);
44a8e56a 3352 CvFLAGS(cv) = CvFLAGS(compcv);
748a9306 3353 CvOUTSIDE(cv) = CvOUTSIDE(compcv);
e9a444f0 3354 CvOUTSIDE(compcv) = 0;
748a9306 3355 CvPADLIST(cv) = CvPADLIST(compcv);
4aa0a1f7 3356 CvPADLIST(compcv) = 0;
4633a7c4
LW		 3357 if (SvREFCNT(compcv) > 1) /* XXX Make closures transit through stub. */
3358 CvOUTSIDE(compcv) = (CV*)SvREFCNT_inc((SV*)cv);
748a9306 3359 SvREFCNT_dec(compcv);
a0d0e21e
LW		 3360 }
3361 else {
748a9306 3362 cv = compcv;
44a8e56a 3363 if (name) {
3364 GvCV(gv) = cv;
3365 GvCVGEN(gv) = 0;
3366 sub_generation++;
3367 }
a0d0e21e 3368 }
44a8e56a 3369 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805 3370 CvFILEGV(cv) = curcop->cop_filegv;
8990e307 3371 CvSTASH(cv) = curstash;
11343788
MB		 3372#ifdef USE_THREADS
3373 CvOWNER(cv) = 0;
12ca11f6 3374 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3375 MUTEX_INIT(CvMUTEXP(cv));
11343788 3376#endif /* USE_THREADS */
8990e307 3377
3fe9a6f1 3378 if (ps)
3379 sv_setpv((SV*)cv, ps);
4633a7c4 3380
c07a80fd 3381 if (error_count) {
3382 op_free(block);
3383 block = Nullop;
68dc0745 3384 if (name) {
3385 char *s = strrchr(name, ':');
3386 s = s ? s+1 : name;
6d4c2119
CS		 3387 if (strEQ(s, "BEGIN")) {
3388 char *not_safe =
3389 "BEGIN not safe after errors--compilation aborted";
3390 if (in_eval & 4)
3391 croak(not_safe);
3392 else {
3393 /* force display of errors found but not reported */
38a03e6e
MB		 3394 sv_catpv(ERRSV, not_safe);
3395 croak("%s", SvPVx(ERRSV, na));
6d4c2119
CS		 3396 }
3397 }
68dc0745 3398 }
c07a80fd 3399 }
a0d0e21e 3400 if (!block) {
a0d0e21e
LW		 3401 copline = NOLINE;
3402 LEAVE_SCOPE(floor);
3403 return cv;
3404 }
3405
93965878
NIS		 3406 if (AvFILLp(comppad_name) < AvFILLp(comppad))
3407 av_store(comppad_name, AvFILLp(comppad), Nullsv);
a0d0e21e 3408
54310121 3409 if (CvCLONE(cv)) {
3410 SV **namep = AvARRAY(comppad_name);
93965878 3411 for (ix = AvFILLp(comppad); ix > 0; ix--) {
54310121 3412 SV *namesv;
3413
3414 if (SvIMMORTAL(curpad[ix]))
3415 continue;
3416 /*
3417 * The only things that a clonable function needs in its
3418 * pad are references to outer lexicals and anonymous subs.
3419 * The rest are created anew during cloning.
3420 */
3421 if (!((namesv = namep[ix]) != Nullsv &&
3422 namesv != &sv_undef &&
3423 (SvFAKE(namesv) ||
3424 *SvPVX(namesv) == '&')))
3425 {
3426 SvREFCNT_dec(curpad[ix]);
3427 curpad[ix] = Nullsv;
3428 }
3429 }
a0d0e21e 3430 }
54310121 3431 else {
3432 AV *av = newAV(); /* Will be @_ */
3433 av_extend(av, 0);
3434 av_store(comppad, 0, (SV*)av);
3435 AvFLAGS(av) = AVf_REIFY;
79072805 3436
93965878 3437 for (ix = AvFILLp(comppad); ix > 0; ix--) {
54310121 3438 if (SvIMMORTAL(curpad[ix]))
3439 continue;
3440 if (!SvPADMY(curpad[ix]))
3441 SvPADTMP_on(curpad[ix]);
3442 }
3443 }
79072805 3444
a0d0e21e 3445 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
79072805
LW		 3446 CvSTART(cv) = LINKLIST(CvROOT(cv));
3447 CvROOT(cv)->op_next = 0;
3448 peep(CvSTART(cv));
93a17b20 3449
44a8e56a 3450 if (name) {
3451 char *s;
3452
84902520 3453 if (PERLDB_SUBLINE && curstash != debstash) {
46fc3d4c 3454 SV *sv = NEWSV(0,0);
44a8e56a 3455 SV *tmpstr = sv_newmortal();
549bb64a 3456 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
44a8e56a 3457 CV *cv;
3458 HV *hv;
3459
51790459
MB		 3460 sv_setpvf(sv, "%_:%ld-%ld",
3461 GvSV(curcop->cop_filegv),
3462 (long)subline, (long)curcop->cop_line);
44a8e56a 3463 gv_efullname3(tmpstr, gv, Nullch);
3464 hv_store(GvHV(DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 3465 hv = GvHVn(db_postponed);
9607fc9c 3466 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX(tmpstr), SvCUR(tmpstr))
3467 && (cv = GvCV(db_postponed))) {
44a8e56a 3468 dSP;
3469 PUSHMARK(sp);
3470 XPUSHs(tmpstr);
3471 PUTBACK;
3472 perl_call_sv((SV*)cv, G_DISCARD);
3473 }
3474 }
79072805 3475
44a8e56a 3476 if ((s = strrchr(name,':')))
28757baa 3477 s++;
3478 else
3479 s = name;
68dc0745 3480 if (strEQ(s, "BEGIN")) {
2ae324a7 3481 I32 oldscope = scopestack_ix;
28757baa 3482 ENTER;
3483 SAVESPTR(compiling.cop_filegv);
3484 SAVEI16(compiling.cop_line);
3485 SAVEI32(perldb);
3486 save_svref(&rs);
3487 sv_setsv(rs, nrs);
3488
3489 if (!beginav)
3490 beginav = newAV();
3491 DEBUG_x( dump_sub(gv) );
3492 av_push(beginav, (SV *)cv);
3493 GvCV(gv) = 0;
68dc0745 3494 call_list(oldscope, beginav);
a6006777 3495
28757baa 3496 curcop = &compiling;
3497 LEAVE;
3498 }
3499 else if (strEQ(s, "END") && !error_count) {
3500 if (!endav)
3501 endav = newAV();
3502 av_unshift(endav, 1);
3503 av_store(endav, 0, (SV *)cv);
3504 GvCV(gv) = 0;
3505 }
7d07dbc2
MB		 3506 else if (strEQ(s, "INIT") && !error_count) {
3507 if (!initav)
3508 initav = newAV();
3509 av_push(initav, SvREFCNT_inc(cv));
ae77835f 3510 }
79072805 3511 }
a6006777 3512
aa689395 3513 done:
79072805 3514 copline = NOLINE;
8990e307 3515 LEAVE_SCOPE(floor);
a0d0e21e 3516 return cv;
79072805
LW		 3517}
3518
57d3b86d 3519CV *
aeea060c 3520newXS(char *name, void (*subaddr) (CV *), char *filename)
a0d0e21e 3521{
11343788 3522 dTHR;
44a8e56a 3523 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 3524 register CV *cv;
44a8e56a 3525
3526 if (cv = (name ? GvCV(gv) : Nullcv)) {
3527 if (GvCVGEN(gv)) {
3528 /* just a cached method */
3529 SvREFCNT_dec(cv);
3530 cv = 0;
3531 }
3532 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3533 /* already defined (or promised) */
2f34f9d4
IZ		 3534 if (dowarn && !(CvGV(cv) && GvSTASH(CvGV(cv))
3535 && HvNAME(GvSTASH(CvGV(cv)))
3536 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "autouse"))) {
a0d0e21e 3537 line_t oldline = curcop->cop_line;
a0d0e21e
LW		 3538 curcop->cop_line = copline;
3539 warn("Subroutine %s redefined",name);
3540 curcop->cop_line = oldline;
3541 }
3542 SvREFCNT_dec(cv);
3543 cv = 0;
79072805 3544 }
79072805 3545 }
44a8e56a 3546
3547 if (cv) /* must reuse cv if autoloaded */
3548 cv_undef(cv);
a0d0e21e
LW		 3549 else {
3550 cv = (CV*)NEWSV(1105,0);
3551 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 3552 if (name) {
3553 GvCV(gv) = cv;
3554 GvCVGEN(gv) = 0;
3555 sub_generation++;
3556 }
a0d0e21e 3557 }
5196be3e 3558 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
11343788 3559#ifdef USE_THREADS
12ca11f6 3560 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3561 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3562 CvOWNER(cv) = 0;
3563#endif /* USE_THREADS */
79072805 3564 CvFILEGV(cv) = gv_fetchfile(filename);
a0d0e21e 3565 CvXSUB(cv) = subaddr;
44a8e56a 3566
28757baa 3567 if (name) {
3568 char *s = strrchr(name,':');
3569 if (s)
3570 s++;
3571 else
3572 s = name;
3573 if (strEQ(s, "BEGIN")) {
3574 if (!beginav)
3575 beginav = newAV();
44a8e56a 3576 av_push(beginav, (SV *)cv);
3577 GvCV(gv) = 0;
28757baa 3578 }
3579 else if (strEQ(s, "END")) {
3580 if (!endav)
3581 endav = newAV();
3582 av_unshift(endav, 1);
44a8e56a 3583 av_store(endav, 0, (SV *)cv);
3584 GvCV(gv) = 0;
28757baa 3585 }
7d07dbc2
MB		 3586 else if (strEQ(s, "INIT")) {
3587 if (!initav)
3588 initav = newAV();
3589 av_push(initav, (SV *)cv);
ae77835f 3590 }
28757baa 3591 }
8990e307 3592 else
a5f75d66 3593 CvANON_on(cv);
44a8e56a 3594
a0d0e21e 3595 return cv;
79072805
LW		 3596}
3597
3598void
8ac85365 3599newFORM(I32 floor, OP *o, OP *block)
79072805 3600{
11343788 3601 dTHR;
79072805
LW		 3602 register CV *cv;
3603 char *name;
3604 GV *gv;
a0d0e21e 3605 I32 ix;
79072805 3606
11343788
MB		 3607 if (o)
3608 name = SvPVx(cSVOPo->op_sv, na);
79072805
LW		 3609 else
3610 name = "STDOUT";
85e6fe83 3611 gv = gv_fetchpv(name,TRUE, SVt_PVFM);
a5f75d66 3612 GvMULTI_on(gv);
79072805
LW		 3613 if (cv = GvFORM(gv)) {
3614 if (dowarn) {
3615 line_t oldline = curcop->cop_line;
3616
3617 curcop->cop_line = copline;
3618 warn("Format %s redefined",name);
3619 curcop->cop_line = oldline;
3620 }
8990e307 3621 SvREFCNT_dec(cv);
79072805 3622 }
748a9306 3623 cv = compcv;
79072805 3624 GvFORM(gv) = cv;
44a8e56a 3625 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805
LW		 3626 CvFILEGV(cv) = curcop->cop_filegv;
3627
93965878 3628 for (ix = AvFILLp(comppad); ix > 0; ix--) {
44a8e56a 3629 if (!SvPADMY(curpad[ix]) && !SvIMMORTAL(curpad[ix]))
a0d0e21e
LW		 3630 SvPADTMP_on(curpad[ix]);
3631 }
3632
79072805
LW		 3633 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
3634 CvSTART(cv) = LINKLIST(CvROOT(cv));
3635 CvROOT(cv)->op_next = 0;
3636 peep(CvSTART(cv));
11343788 3637 op_free(o);
79072805 3638 copline = NOLINE;
8990e307 3639 LEAVE_SCOPE(floor);
79072805
LW		 3640}
3641
3642OP *
8ac85365 3643newANONLIST(OP *o)
79072805 3644{
93a17b20 3645 return newUNOP(OP_REFGEN, 0,
11343788 3646 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 3647}
3648
3649OP *
8ac85365 3650newANONHASH(OP *o)
79072805 3651{
93a17b20 3652 return newUNOP(OP_REFGEN, 0,
11343788 3653 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 3654}
3655
3656OP *
8ac85365 3657newANONSUB(I32 floor, OP *proto, OP *block)
a0d0e21e
LW		 3658{
3659 return newUNOP(OP_REFGEN, 0,
4633a7c4 3660 newSVOP(OP_ANONCODE, 0, (SV*)newSUB(floor, 0, proto, block)));
79072805
LW		 3661}
3662
3663OP *
8ac85365 3664oopsAV(OP *o)
79072805 3665{
ed6116ce
LW		 3666 switch (o->op_type) {
3667 case OP_PADSV:
3668 o->op_type = OP_PADAV;
3669 o->op_ppaddr = ppaddr[OP_PADAV];
3670 return ref(newUNOP(OP_RV2AV, 0, scalar(o)), OP_RV2AV);
3671
3672 case OP_RV2SV:
79072805
LW		 3673 o->op_type = OP_RV2AV;
3674 o->op_ppaddr = ppaddr[OP_RV2AV];
3675 ref(o, OP_RV2AV);
ed6116ce
LW		 3676 break;
3677
3678 default:
79072805 3679 warn("oops: oopsAV");
ed6116ce
LW		 3680 break;
3681 }
79072805
LW		 3682 return o;
3683}
3684
3685OP *
8ac85365 3686oopsHV(OP *o)
79072805 3687{
ed6116ce
LW		 3688 switch (o->op_type) {
3689 case OP_PADSV:
3690 case OP_PADAV:
3691 o->op_type = OP_PADHV;
3692 o->op_ppaddr = ppaddr[OP_PADHV];
3693 return ref(newUNOP(OP_RV2HV, 0, scalar(o)), OP_RV2HV);
3694
3695 case OP_RV2SV:
3696 case OP_RV2AV:
79072805
LW		 3697 o->op_type = OP_RV2HV;
3698 o->op_ppaddr = ppaddr[OP_RV2HV];
3699 ref(o, OP_RV2HV);
ed6116ce
LW		 3700 break;
3701
3702 default:
79072805 3703 warn("oops: oopsHV");
ed6116ce
LW		 3704 break;
3705 }
79072805
LW		 3706 return o;
3707}
3708
3709OP *
8ac85365 3710newAVREF(OP *o)
79072805 3711{
ed6116ce
LW		 3712 if (o->op_type == OP_PADANY) {
3713 o->op_type = OP_PADAV;
3714 o->op_ppaddr = ppaddr[OP_PADAV];
93a17b20 3715 return o;
ed6116ce 3716 }
79072805
LW		 3717 return newUNOP(OP_RV2AV, 0, scalar(o));
3718}
3719
3720OP *
8ac85365 3721newGVREF(I32 type, OP *o)
79072805 3722{
a0d0e21e
LW		 3723 if (type == OP_MAPSTART)
3724 return newUNOP(OP_NULL, 0, o);
748a9306 3725 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 3726}
3727
3728OP *
8ac85365 3729newHVREF(OP *o)
79072805 3730{
ed6116ce
LW		 3731 if (o->op_type == OP_PADANY) {
3732 o->op_type = OP_PADHV;
3733 o->op_ppaddr = ppaddr[OP_PADHV];
93a17b20 3734 return o;
ed6116ce 3735 }
79072805
LW		 3736 return newUNOP(OP_RV2HV, 0, scalar(o));
3737}
3738
3739OP *
8ac85365 3740oopsCV(OP *o)
79072805 3741{
463ee0b2 3742 croak("NOT IMPL LINE %d",__LINE__);
79072805
LW		 3743 /* STUB */
3744 return o;
3745}
3746
3747OP *
8ac85365 3748newCVREF(I32 flags, OP *o)
79072805 3749{
c07a80fd 3750 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 3751}
3752
3753OP *
8ac85365 3754newSVREF(OP *o)
79072805 3755{
ed6116ce
LW		 3756 if (o->op_type == OP_PADANY) {
3757 o->op_type = OP_PADSV;
3758 o->op_ppaddr = ppaddr[OP_PADSV];
93a17b20 3759 return o;
ed6116ce 3760 }
224a4551
MB		 3761 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
3762 o->op_flags |= OPpDONE_SVREF;
a863c7d1 3763 return o;
224a4551 3764 }
79072805
LW		 3765 return newUNOP(OP_RV2SV, 0, scalar(o));
3766}
3767
3768/* Check routines. */
3769
3770OP *
8ac85365 3771ck_anoncode(OP *o)
5f05dabc 3772{
178c6305
CS		 3773 PADOFFSET ix;
3774 SV* name;
3775
3776 name = NEWSV(1106,0);
3777 sv_upgrade(name, SVt_PVNV);
3778 sv_setpvn(name, "&", 1);
3779 SvIVX(name) = -1;
3780 SvNVX(name) = 1;
5dc0d613 3781 ix = pad_alloc(o->op_type, SVs_PADMY);
178c6305 3782 av_store(comppad_name, ix, name);
5dc0d613
MB		 3783 av_store(comppad, ix, cSVOPo->op_sv);
3784 SvPADMY_on(cSVOPo->op_sv);
3785 cSVOPo->op_sv = Nullsv;
3786 cSVOPo->op_targ = ix;
3787 return o;
5f05dabc 3788}
3789
3790OP *
8ac85365 3791ck_bitop(OP *o)
55497cff 3792{
5dc0d613
MB		 3793 o->op_private = hints;
3794 return o;
55497cff 3795}
3796
3797OP *
8ac85365 3798ck_concat(OP *o)
79072805 3799{
11343788
MB		 3800 if (cUNOPo->op_first->op_type == OP_CONCAT)
3801 o->op_flags |= OPf_STACKED;
3802 return o;
79072805
LW		 3803}
3804
3805OP *
8ac85365 3806ck_spair(OP *o)
79072805 3807{
11343788 3808 if (o->op_flags & OPf_KIDS) {
79072805 3809 OP* newop;
a0d0e21e 3810 OP* kid;
5dc0d613
MB		 3811 OPCODE type = o->op_type;
3812 o = modkids(ck_fun(o), type);
11343788 3813 kid = cUNOPo->op_first;
a0d0e21e
LW		 3814 newop = kUNOP->op_first->op_sibling;
3815 if (newop &&
3816 (newop->op_sibling ||
3817 !(opargs[newop->op_type] & OA_RETSCALAR) ||
3818 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
3819 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
aeea060c 3820
11343788 3821 return o;
a0d0e21e
LW		 3822 }
3823 op_free(kUNOP->op_first);
3824 kUNOP->op_first = newop;
3825 }
11343788
MB		 3826 o->op_ppaddr = ppaddr[++o->op_type];
3827 return ck_fun(o);
a0d0e21e
LW		 3828}
3829
3830OP *
8ac85365 3831ck_delete(OP *o)
a0d0e21e 3832{
11343788 3833 o = ck_fun(o);
5dc0d613 3834 o->op_private = 0;
11343788
MB		 3835 if (o->op_flags & OPf_KIDS) {
3836 OP *kid = cUNOPo->op_first;
5f05dabc 3837 if (kid->op_type == OP_HSLICE)
5dc0d613 3838 o->op_private |= OPpSLICE;
5f05dabc 3839 else if (kid->op_type != OP_HELEM)
3840 croak("%s argument is not a HASH element or slice",
5dc0d613 3841 op_desc[o->op_type]);
a0d0e21e 3842 null(kid);
79072805 3843 }
11343788 3844 return o;
79072805
LW		 3845}
3846
3847OP *
8ac85365 3848ck_eof(OP *o)
79072805 3849{
11343788 3850 I32 type = o->op_type;
79072805 3851
11343788
MB		 3852 if (o->op_flags & OPf_KIDS) {
3853 if (cLISTOPo->op_first->op_type == OP_STUB) {
3854 op_free(o);
3855 o = newUNOP(type, OPf_SPECIAL,
d58bf5aa 3856 newGVOP(OP_GV, 0, gv_fetchpv("main::ARGV", TRUE, SVt_PVAV)));
8990e307 3857 }
11343788 3858 return ck_fun(o);
79072805 3859 }
11343788 3860 return o;
79072805
LW		 3861}
3862
3863OP *
8ac85365 3864ck_eval(OP *o)
79072805 3865{
85e6fe83 3866 hints |= HINT_BLOCK_SCOPE;
11343788
MB		 3867 if (o->op_flags & OPf_KIDS) {
3868 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 3869
93a17b20 3870 if (!kid) {
11343788
MB		 3871 o->op_flags &= ~OPf_KIDS;
3872 null(o);
79072805
LW		 3873 }
3874 else if (kid->op_type == OP_LINESEQ) {
3875 LOGOP *enter;
3876
11343788
MB		 3877 kid->op_next = o->op_next;
3878 cUNOPo->op_first = 0;
3879 op_free(o);
79072805
LW		 3880
3881 Newz(1101, enter, 1, LOGOP);
3882 enter->op_type = OP_ENTERTRY;
3883 enter->op_ppaddr = ppaddr[OP_ENTERTRY];
3884 enter->op_private = 0;
3885
3886 /* establish postfix order */
3887 enter->op_next = (OP*)enter;
3888
11343788
MB		 3889 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
3890 o->op_type = OP_LEAVETRY;
3891 o->op_ppaddr = ppaddr[OP_LEAVETRY];
3892 enter->op_other = o;
3893 return o;
79072805 3894 }
c7cc6f1c 3895 else
473986ff 3896 scalar((OP*)kid);
79072805
LW		 3897 }
3898 else {
11343788 3899 op_free(o);
54b9620d 3900 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
79072805 3901 }
11343788
MB		 3902 o->op_targ = (PADOFFSET)hints;
3903 return o;
79072805
LW		 3904}
3905
3906OP *
8ac85365 3907ck_exec(OP *o)
79072805
LW		 3908{
3909 OP *kid;
11343788
MB		 3910 if (o->op_flags & OPf_STACKED) {
3911 o = ck_fun(o);
3912 kid = cUNOPo->op_first->op_sibling;
8990e307
LW		 3913 if (kid->op_type == OP_RV2GV)
3914 null(kid);
79072805 3915 }
463ee0b2 3916 else
11343788
MB		 3917 o = listkids(o);
3918 return o;
79072805
LW		 3919}
3920
3921OP *
8ac85365 3922ck_exists(OP *o)
5f05dabc 3923{
5196be3e
MB		 3924 o = ck_fun(o);
3925 if (o->op_flags & OPf_KIDS) {
3926 OP *kid = cUNOPo->op_first;
5f05dabc 3927 if (kid->op_type != OP_HELEM)
5196be3e 3928 croak("%s argument is not a HASH element", op_desc[o->op_type]);
5f05dabc 3929 null(kid);
3930 }
5196be3e 3931 return o;
5f05dabc 3932}
3933
3934OP *
8ac85365 3935ck_gvconst(register OP *o)
79072805
LW		 3936{
3937 o = fold_constants(o);
3938 if (o->op_type == OP_CONST)
3939 o->op_type = OP_GV;
3940 return o;
3941}
3942
3943OP *
8ac85365 3944ck_rvconst(register OP *o)
79072805 3945{
11343788
MB		 3946 dTHR;
3947 SVOP *kid = (SVOP*)cUNOPo->op_first;
85e6fe83 3948
11343788 3949 o->op_private |= (hints & HINT_STRICT_REFS);
79072805 3950 if (kid->op_type == OP_CONST) {
44a8e56a 3951 char *name;
3952 int iscv;
3953 GV *gv;
3954
3955 name = SvPV(kid->op_sv, na);
3956 if ((hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
3957 char *badthing = Nullch;
5dc0d613 3958 switch (o->op_type) {
44a8e56a 3959 case OP_RV2SV:
3960 badthing = "a SCALAR";
3961 break;
3962 case OP_RV2AV:
3963 badthing = "an ARRAY";
3964 break;
3965 case OP_RV2HV:
3966 badthing = "a HASH";
3967 break;
3968 }
3969 if (badthing)
3970 croak(
3971 "Can't use bareword (\"%s\") as %s ref while \"strict refs\" in use",
3972 name, badthing);
3973 }
93233ece
CS		 3974 /*
3975 * This is a little tricky. We only want to add the symbol if we
3976 * didn't add it in the lexer. Otherwise we get duplicate strict
3977 * warnings. But if we didn't add it in the lexer, we must at
3978 * least pretend like we wanted to add it even if it existed before,
3979 * or we get possible typo warnings. OPpCONST_ENTERED says
3980 * whether the lexer already added THIS instance of this symbol.
3981 */
5196be3e 3982 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 3983 do {
44a8e56a 3984 gv = gv_fetchpv(name,
748a9306 3985 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 3986 iscv
3987 ? SVt_PVCV
11343788 3988 : o->op_type == OP_RV2SV
a0d0e21e 3989 ? SVt_PV
11343788 3990 : o->op_type == OP_RV2AV
a0d0e21e 3991 ? SVt_PVAV
11343788 3992 : o->op_type == OP_RV2HV
a0d0e21e
LW		 3993 ? SVt_PVHV
3994 : SVt_PVGV);
93233ece
CS		 3995 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
3996 if (gv) {
3997 kid->op_type = OP_GV;
3998 SvREFCNT_dec(kid->op_sv);
3999 kid->op_sv = SvREFCNT_inc(gv);
a0d0e21e 4000 }
79072805 4001 }
11343788 4002 return o;
79072805
LW		 4003}
4004
4005OP *
8ac85365 4006ck_ftst(OP *o)
79072805 4007{
11343788
MB		 4008 dTHR;
4009 I32 type = o->op_type;
79072805 4010
11343788
MB		 4011 if (o->op_flags & OPf_REF)
4012 return o;
79072805 4013
11343788
MB		 4014 if (o->op_flags & OPf_KIDS) {
4015 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805
LW		 4016
4017 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
a0d0e21e 4018 OP *newop = newGVOP(type, OPf_REF,
85e6fe83 4019 gv_fetchpv(SvPVx(kid->op_sv, na), TRUE, SVt_PVIO));
11343788 4020 op_free(o);
79072805
LW		 4021 return newop;
4022 }
4023 }
4024 else {
11343788 4025 op_free(o);
79072805 4026 if (type == OP_FTTTY)
fb73857a 4027 return newGVOP(type, OPf_REF, gv_fetchpv("main::STDIN", TRUE,
85e6fe83 4028 SVt_PVIO));
79072805 4029 else
54b9620d 4030 return newUNOP(type, 0, newDEFSVOP());
79072805 4031 }
11343788 4032 return o;
79072805
LW		 4033}
4034
4035OP *
8ac85365 4036ck_fun(OP *o)
79072805 4037{
11343788 4038 dTHR;
79072805
LW		 4039 register OP *kid;
4040 OP **tokid;
4041 OP *sibl;
4042 I32 numargs = 0;
11343788 4043 int type = o->op_type;
a0d0e21e 4044 register I32 oa = opargs[type] >> OASHIFT;
aeea060c 4045
11343788 4046 if (o->op_flags & OPf_STACKED) {
79072805
LW		 4047 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
4048 oa &= ~OA_OPTIONAL;
4049 else
11343788 4050 return no_fh_allowed(o);
79072805
LW		 4051 }
4052
11343788
MB		 4053 if (o->op_flags & OPf_KIDS) {
4054 tokid = &cLISTOPo->op_first;
4055 kid = cLISTOPo->op_first;
8990e307
LW		 4056 if (kid->op_type == OP_PUSHMARK ||
4057 kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK)
4058 {
79072805
LW		 4059 tokid = &kid->op_sibling;
4060 kid = kid->op_sibling;
4061 }
a0d0e21e 4062 if (!kid && opargs[type] & OA_DEFGV)
54b9620d 4063 *tokid = kid = newDEFSVOP();
79072805
LW		 4064
4065 while (oa && kid) {
4066 numargs++;
4067 sibl = kid->op_sibling;
4068 switch (oa & 7) {
4069 case OA_SCALAR:
4070 scalar(kid);
4071 break;
4072 case OA_LIST:
4073 if (oa < 16) {
4074 kid = 0;
4075 continue;
4076 }
4077 else
4078 list(kid);
4079 break;
4080 case OA_AVREF:
4081 if (kid->op_type == OP_CONST &&
4082 (kid->op_private & OPpCONST_BARE)) {
463ee0b2 4083 char *name = SvPVx(((SVOP*)kid)->op_sv, na);
79072805 4084 OP *newop = newAVREF(newGVOP(OP_GV, 0,
85e6fe83 4085 gv_fetchpv(name, TRUE, SVt_PVAV) ));
463ee0b2 4086 if (dowarn)
ff0cee69 4087 warn("Array @%s missing the @ in argument %ld of %s()",
4088 name, (long)numargs, op_desc[type]);
79072805
LW		 4089 op_free(kid);
4090 kid = newop;
4091 kid->op_sibling = sibl;
4092 *tokid = kid;
4093 }
8990e307 4094 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
11343788 4095 bad_type(numargs, "array", op_desc[o->op_type], kid);
a0d0e21e 4096 mod(kid, type);
79072805
LW		 4097 break;
4098 case OA_HVREF:
4099 if (kid->op_type == OP_CONST &&
4100 (kid->op_private & OPpCONST_BARE)) {
463ee0b2 4101 char *name = SvPVx(((SVOP*)kid)->op_sv, na);
79072805 4102 OP *newop = newHVREF(newGVOP(OP_GV, 0,
85e6fe83 4103 gv_fetchpv(name, TRUE, SVt_PVHV) ));
463ee0b2 4104 if (dowarn)
ff0cee69 4105 warn("Hash %%%s missing the %% in argument %ld of %s()",
4106 name, (long)numargs, op_desc[type]);
79072805
LW		 4107 op_free(kid);
4108 kid = newop;
4109 kid->op_sibling = sibl;
4110 *tokid = kid;
4111 }
8990e307 4112 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
11343788 4113 bad_type(numargs, "hash", op_desc[o->op_type], kid);
a0d0e21e 4114 mod(kid, type);
79072805
LW		 4115 break;
4116 case OA_CVREF:
4117 {
a0d0e21e 4118 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 4119 kid->op_sibling = 0;
4120 linklist(kid);
4121 newop->op_next = newop;
4122 kid = newop;
4123 kid->op_sibling = sibl;
4124 *tokid = kid;
4125 }
4126 break;
4127 case OA_FILEREF:
4128 if (kid->op_type != OP_GV) {
4129 if (kid->op_type == OP_CONST &&
4130 (kid->op_private & OPpCONST_BARE)) {
4131 OP *newop = newGVOP(OP_GV, 0,
85e6fe83
LW		 4132 gv_fetchpv(SvPVx(((SVOP*)kid)->op_sv, na), TRUE,
4133 SVt_PVIO) );
79072805
LW		 4134 op_free(kid);
4135 kid = newop;
4136 }
4137 else {
4138 kid->op_sibling = 0;
4139 kid = newUNOP(OP_RV2GV, 0, scalar(kid));
4140 }
4141 kid->op_sibling = sibl;
4142 *tokid = kid;
4143 }
4144 scalar(kid);
4145 break;
4146 case OA_SCALARREF:
a0d0e21e 4147 mod(scalar(kid), type);
79072805
LW		 4148 break;
4149 }
4150 oa >>= 4;
4151 tokid = &kid->op_sibling;
4152 kid = kid->op_sibling;
4153 }
11343788 4154 o->op_private |= numargs;
79072805 4155 if (kid)
11343788
MB		 4156 return too_many_arguments(o,op_desc[o->op_type]);
4157 listkids(o);
79072805 4158 }
a0d0e21e 4159 else if (opargs[type] & OA_DEFGV) {
11343788 4160 op_free(o);
54b9620d 4161 return newUNOP(type, 0, newDEFSVOP());
a0d0e21e
LW		 4162 }
4163
79072805
LW		 4164 if (oa) {
4165 while (oa & OA_OPTIONAL)
4166 oa >>= 4;
4167 if (oa && oa != OA_LIST)
11343788 4168 return too_few_arguments(o,op_desc[o->op_type]);
79072805 4169 }
11343788 4170 return o;
79072805
LW		 4171}
4172
4173OP *
8ac85365 4174ck_glob(OP *o)
79072805 4175{
fb73857a 4176 GV *gv;
4177
1f2bfc8a 4178 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 4179 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 4180
4181 if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV)) && GvIMPORTED_CV(gv)))
4182 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
b1cb66bf 4183
4184 if (gv && GvIMPORTED_CV(gv)) {
46fc3d4c 4185 static int glob_index;
4186
5196be3e 4187 append_elem(OP_GLOB, o,
46fc3d4c 4188 newSVOP(OP_CONST, 0, newSViv(glob_index++)));
1f2bfc8a
MB		 4189 o->op_type = OP_LIST;
4190 o->op_ppaddr = ppaddr[OP_LIST];
4191 cLISTOPo->op_first->op_type = OP_PUSHMARK;
4192 cLISTOPo->op_first->op_ppaddr = ppaddr[OP_PUSHMARK];
4193 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 4194 append_elem(OP_LIST, o,
1f2bfc8a
MB		 4195 scalar(newUNOP(OP_RV2CV, 0,
4196 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 4197 o = newUNOP(OP_NULL, 0, ck_subr(o));
4198 o->op_targ = OP_GLOB; /* hint at what it used to be */
4199 return o;
b1cb66bf 4200 }
4201 gv = newGVgen("main");
a0d0e21e 4202 gv_IOadd(gv);
11343788
MB		 4203 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
4204 scalarkids(o);
4205 return ck_fun(o);
79072805
LW		 4206}
4207
4208OP *
8ac85365 4209ck_grep(OP *o)
79072805
LW		 4210{
4211 LOGOP *gwop;
4212 OP *kid;
11343788 4213 OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
79072805 4214
11343788 4215 o->op_ppaddr = ppaddr[OP_GREPSTART];
a0d0e21e 4216 Newz(1101, gwop, 1, LOGOP);
aeea060c 4217
11343788 4218 if (o->op_flags & OPf_STACKED) {
a0d0e21e 4219 OP* k;
11343788
MB		 4220 o = ck_sort(o);
4221 kid = cLISTOPo->op_first->op_sibling;
4222 for (k = cLISTOPo->op_first->op_sibling->op_next; k; k = k->op_next) {
a0d0e21e
LW		 4223 kid = k;
4224 }
4225 kid->op_next = (OP*)gwop;
11343788 4226 o->op_flags &= ~OPf_STACKED;
93a17b20 4227 }
11343788 4228 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 4229 if (type == OP_MAPWHILE)
4230 list(kid);
4231 else
4232 scalar(kid);
11343788 4233 o = ck_fun(o);
79072805 4234 if (error_count)
11343788 4235 return o;
aeea060c 4236 kid = cLISTOPo->op_first->op_sibling;
79072805 4237 if (kid->op_type != OP_NULL)
463ee0b2 4238 croak("panic: ck_grep");
79072805
LW		 4239 kid = kUNOP->op_first;
4240
a0d0e21e
LW		 4241 gwop->op_type = type;
4242 gwop->op_ppaddr = ppaddr[type];
11343788 4243 gwop->op_first = listkids(o);
79072805
LW		 4244 gwop->op_flags |= OPf_KIDS;
4245 gwop->op_private = 1;
4246 gwop->op_other = LINKLIST(kid);
a0d0e21e 4247 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
79072805
LW		 4248 kid->op_next = (OP*)gwop;
4249
11343788 4250 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 4251 if (!kid || !kid->op_sibling)
11343788 4252 return too_few_arguments(o,op_desc[o->op_type]);
a0d0e21e
LW		 4253 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
4254 mod(kid, OP_GREPSTART);
4255
79072805
LW		 4256 return (OP*)gwop;
4257}
4258
4259OP *
8ac85365 4260ck_index(OP *o)
79072805 4261{
11343788
MB		 4262 if (o->op_flags & OPf_KIDS) {
4263 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
79072805 4264 if (kid && kid->op_type == OP_CONST)
2779dcf1 4265 fbm_compile(((SVOP*)kid)->op_sv, 0);
79072805 4266 }
11343788 4267 return ck_fun(o);
79072805
LW		 4268}
4269
4270OP *
8ac85365 4271ck_lengthconst(OP *o)
79072805
LW		 4272{
4273 /* XXX length optimization goes here */
11343788 4274 return ck_fun(o);
79072805
LW		 4275}
4276
4277OP *
8ac85365 4278ck_lfun(OP *o)
79072805 4279{
5dc0d613
MB		 4280 OPCODE type = o->op_type;
4281 return modkids(ck_fun(o), type);
79072805
LW		 4282}
4283
4284OP *
8ac85365 4285ck_rfun(OP *o)
8990e307 4286{
5dc0d613
MB		 4287 OPCODE type = o->op_type;
4288 return refkids(ck_fun(o), type);
8990e307
LW		 4289}
4290
4291OP *
8ac85365 4292ck_listiob(OP *o)
79072805
LW		 4293{
4294 register OP *kid;
aeea060c 4295
11343788 4296 kid = cLISTOPo->op_first;
79072805 4297 if (!kid) {
11343788
MB		 4298 o = force_list(o);
4299 kid = cLISTOPo->op_first;
79072805
LW		 4300 }
4301 if (kid->op_type == OP_PUSHMARK)
4302 kid = kid->op_sibling;
11343788 4303 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 4304 kid = kid->op_sibling;
4305 else if (kid && !kid->op_sibling) { /* print HANDLE; */
4306 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 4307 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 4308 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 4309 cLISTOPo->op_first->op_sibling = kid;
4310 cLISTOPo->op_last = kid;
79072805
LW		 4311 kid = kid->op_sibling;
4312 }
4313 }
4314
4315 if (!kid)
54b9620d 4316 append_elem(o->op_type, o, newDEFSVOP());
79072805 4317
5dc0d613 4318 o = listkids(o);
bbce6d69 4319
5dc0d613 4320 o->op_private = 0;
36477c24 4321#ifdef USE_LOCALE
bbce6d69 4322 if (hints & HINT_LOCALE)
5dc0d613 4323 o->op_private |= OPpLOCALE;
bbce6d69 4324#endif
4325
5dc0d613 4326 return o;
bbce6d69 4327}
4328
4329OP *
8ac85365 4330ck_fun_locale(OP *o)
bbce6d69 4331{
5dc0d613 4332 o = ck_fun(o);
bbce6d69 4333
5dc0d613 4334 o->op_private = 0;
36477c24 4335#ifdef USE_LOCALE
bbce6d69 4336 if (hints & HINT_LOCALE)
5dc0d613 4337 o->op_private |= OPpLOCALE;
bbce6d69 4338#endif
4339
5dc0d613 4340 return o;
bbce6d69 4341}
4342
4343OP *
8ac85365 4344ck_scmp(OP *o)
bbce6d69 4345{
5dc0d613 4346 o->op_private = 0;
36477c24 4347#ifdef USE_LOCALE
bbce6d69 4348 if (hints & HINT_LOCALE)
5dc0d613 4349 o->op_private |= OPpLOCALE;
bbce6d69 4350#endif
36477c24 4351
5dc0d613 4352 return o;
79072805
LW		 4353}
4354
4355OP *
8ac85365 4356ck_match(OP *o)
79072805 4357{
5dc0d613 4358 o->op_private |= OPpRUNTIME;
11343788 4359 return o;
79072805
LW		 4360}
4361
4362OP *
8ac85365 4363ck_null(OP *o)
79072805 4364{
11343788 4365 return o;
79072805
LW		 4366}
4367
4368OP *
8ac85365 4369ck_repeat(OP *o)
79072805 4370{
11343788
MB		 4371 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
4372 o->op_private |= OPpREPEAT_DOLIST;
4373 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 4374 }
4375 else
11343788
MB		 4376 scalar(o);
4377 return o;
79072805
LW		 4378}
4379
4380OP *
8ac85365 4381ck_require(OP *o)
8990e307 4382{
11343788
MB		 4383 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
4384 SVOP *kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 4385
4386 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
8990e307 4387 char *s;
a0d0e21e
LW		 4388 for (s = SvPVX(kid->op_sv); *s; s++) {
4389 if (*s == ':' && s[1] == ':') {
4390 *s = '/';
1aef975c 4391 Move(s+2, s+1, strlen(s+2)+1, char);
a0d0e21e
LW		 4392 --SvCUR(kid->op_sv);
4393 }
8990e307 4394 }
a0d0e21e 4395 sv_catpvn(kid->op_sv, ".pm", 3);
8990e307
LW		 4396 }
4397 }
11343788 4398 return ck_fun(o);
8990e307
LW		 4399}
4400
4401OP *
8ac85365 4402ck_retarget(OP *o)
79072805 4403{
463ee0b2 4404 croak("NOT IMPL LINE %d",__LINE__);
79072805 4405 /* STUB */
11343788 4406 return o;
79072805
LW		 4407}
4408
4409OP *
8ac85365 4410ck_select(OP *o)
79072805 4411{
c07a80fd 4412 OP* kid;
11343788
MB		 4413 if (o->op_flags & OPf_KIDS) {
4414 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 4415 if (kid && kid->op_sibling) {
11343788
MB		 4416 o->op_type = OP_SSELECT;
4417 o->op_ppaddr = ppaddr[OP_SSELECT];
4418 o = ck_fun(o);
4419 return fold_constants(o);
79072805
LW		 4420 }
4421 }
11343788
MB		 4422 o = ck_fun(o);
4423 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 4424 if (kid && kid->op_type == OP_RV2GV)
4425 kid->op_private &= ~HINT_STRICT_REFS;
11343788 4426 return o;
79072805
LW		 4427}
4428
4429OP *
8ac85365 4430ck_shift(OP *o)
79072805 4431{
11343788 4432 I32 type = o->op_type;
79072805 4433
11343788 4434 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2
MB		 4435 OP *argop;
4436
11343788 4437 op_free(o);
6d4ff0d2 4438#ifdef USE_THREADS
977336f5 4439 if (!CvUNIQUE(compcv)) {
6d4ff0d2
MB		 4440 argop = newOP(OP_PADAV, OPf_REF);
4441 argop->op_targ = 0; /* curpad[0] is @_ */
4442 }
4443 else {
4444 argop = newUNOP(OP_RV2AV, 0,
4445 scalar(newGVOP(OP_GV, 0,
4446 gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
4447 }
4448#else
4449 argop = newUNOP(OP_RV2AV, 0,
977336f5 4450 scalar(newGVOP(OP_GV, 0, !CvUNIQUE(compcv) ?
6d4ff0d2
MB		 4451 defgv : gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
4452#endif /* USE_THREADS */
4453 return newUNOP(type, 0, scalar(argop));
79072805 4454 }
11343788 4455 return scalar(modkids(ck_fun(o), type));
79072805
LW		 4456}
4457
4458OP *
8ac85365 4459ck_sort(OP *o)
79072805 4460{
5dc0d613 4461 o->op_private = 0;
36477c24 4462#ifdef USE_LOCALE
bbce6d69 4463 if (hints & HINT_LOCALE)
5dc0d613 4464 o->op_private |= OPpLOCALE;
bbce6d69 4465#endif
4466
11343788
MB		 4467 if (o->op_flags & OPf_STACKED) {
4468 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
463ee0b2
LW		 4469 OP *k;
4470 kid = kUNOP->op_first; /* get past rv2gv */
79072805 4471
463ee0b2 4472 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 4473 linklist(kid);
463ee0b2
LW		 4474 if (kid->op_type == OP_SCOPE) {
4475 k = kid->op_next;
4476 kid->op_next = 0;
79072805 4477 }
463ee0b2 4478 else if (kid->op_type == OP_LEAVE) {
11343788 4479 if (o->op_type == OP_SORT) {
748a9306
LW		 4480 null(kid); /* wipe out leave */
4481 kid->op_next = kid;
463ee0b2 4482
748a9306
LW		 4483 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
4484 if (k->op_next == kid)
4485 k->op_next = 0;
4486 }
463ee0b2 4487 }
748a9306
LW		 4488 else
4489 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 4490 k = kLISTOP->op_first;
463ee0b2 4491 }
a0d0e21e
LW		 4492 peep(k);
4493
11343788 4494 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
8990e307 4495 null(kid); /* wipe out rv2gv */
11343788 4496 if (o->op_type == OP_SORT)
a0d0e21e
LW		 4497 kid->op_next = kid;
4498 else
4499 kid->op_next = k;
11343788 4500 o->op_flags |= OPf_SPECIAL;
79072805
LW		 4501 }
4502 }
bbce6d69 4503
11343788 4504 return o;
79072805
LW		 4505}
4506
4507OP *
8ac85365 4508ck_split(OP *o)
79072805
LW		 4509{
4510 register OP *kid;
aeea060c 4511
11343788
MB		 4512 if (o->op_flags & OPf_STACKED)
4513 return no_fh_allowed(o);
79072805 4514
11343788 4515 kid = cLISTOPo->op_first;
8990e307 4516 if (kid->op_type != OP_NULL)
463ee0b2 4517 croak("panic: ck_split");
8990e307 4518 kid = kid->op_sibling;
11343788
MB		 4519 op_free(cLISTOPo->op_first);
4520 cLISTOPo->op_first = kid;
85e6fe83 4521 if (!kid) {
11343788
MB		 4522 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpv(" ", 1));
4523 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 4524 }
79072805
LW		 4525
4526 if (kid->op_type != OP_MATCH) {
4527 OP *sibl = kid->op_sibling;
463ee0b2 4528 kid->op_sibling = 0;
79072805 4529 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, Nullop);
11343788
MB		 4530 if (cLISTOPo->op_first == cLISTOPo->op_last)
4531 cLISTOPo->op_last = kid;
4532 cLISTOPo->op_first = kid;
79072805
LW		 4533 kid->op_sibling = sibl;
4534 }
4535
4536 kid->op_type = OP_PUSHRE;
4537 kid->op_ppaddr = ppaddr[OP_PUSHRE];
4538 scalar(kid);
4539
4540 if (!kid->op_sibling)
54b9620d 4541 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 4542
4543 kid = kid->op_sibling;
4544 scalar(kid);
4545
4546 if (!kid->op_sibling)
11343788 4547 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
79072805
LW		 4548
4549 kid = kid->op_sibling;
4550 scalar(kid);
4551
4552 if (kid->op_sibling)
11343788 4553 return too_many_arguments(o,op_desc[o->op_type]);
79072805 4554
11343788 4555 return o;
79072805
LW		 4556}
4557
4558OP *
8ac85365 4559ck_subr(OP *o)
79072805 4560{
11343788
MB		 4561 dTHR;
4562 OP *prev = ((cUNOPo->op_first->op_sibling)
4563 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
4564 OP *o2 = prev->op_sibling;
4633a7c4
LW		 4565 OP *cvop;
4566 char *proto = 0;
4567 CV *cv = 0;
46fc3d4c 4568 GV *namegv = 0;
4633a7c4
LW		 4569 int optional = 0;
4570 I32 arg = 0;
4571
11343788 4572 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 4573 if (cvop->op_type == OP_RV2CV) {
4574 SVOP* tmpop;
11343788 4575 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
4633a7c4
LW		 4576 null(cvop); /* disable rv2cv */
4577 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
4578 if (tmpop->op_type == OP_GV) {
8ebc5c01 4579 cv = GvCVu(tmpop->op_sv);
5dc0d613 4580 if (cv && SvPOK(cv) && !(o->op_private & OPpENTERSUB_AMPER)) {
46fc3d4c 4581 namegv = CvANON(cv) ? (GV*)tmpop->op_sv : CvGV(cv);
4582 proto = SvPV((SV*)cv, na);
4583 }
4633a7c4
LW		 4584 }
4585 }
11343788 4586 o->op_private |= (hints & HINT_STRICT_REFS);
84902520 4587 if (PERLDB_SUB && curstash != debstash)
11343788
MB		 4588 o->op_private |= OPpENTERSUB_DB;
4589 while (o2 != cvop) {
4633a7c4
LW		 4590 if (proto) {
4591 switch (*proto) {
4592 case '\0':
5dc0d613 4593 return too_many_arguments(o, gv_ename(namegv));
4633a7c4
LW		 4594 case ';':
4595 optional = 1;
4596 proto++;
4597 continue;
4598 case '$':
4599 proto++;
4600 arg++;
11343788 4601 scalar(o2);
4633a7c4
LW		 4602 break;
4603 case '%':
4604 case '@':
11343788 4605 list(o2);
4633a7c4
LW		 4606 arg++;
4607 break;
4608 case '&':
4609 proto++;
4610 arg++;
11343788 4611 if (o2->op_type != OP_REFGEN && o2->op_type != OP_UNDEF)
5dc0d613 4612 bad_type(arg, "block", gv_ename(namegv), o2);
4633a7c4
LW		 4613 break;
4614 case '*':
4615 proto++;
4616 arg++;
11343788 4617 if (o2->op_type == OP_RV2GV)
4633a7c4
LW		 4618 goto wrapref;
4619 {
11343788 4620 OP* kid = o2;
69dcf70c 4621 OP* sib = kid->op_sibling;
4633a7c4 4622 kid->op_sibling = 0;
69dcf70c
MB		 4623 o2 = newUNOP(OP_RV2GV, 0, kid);
4624 o2->op_sibling = sib;
6fa846a0 4625 prev->op_sibling = o2;
4633a7c4
LW		 4626 }
4627 goto wrapref;
4628 case '\\':
4629 proto++;
4630 arg++;
4631 switch (*proto++) {
4632 case '*':
11343788 4633 if (o2->op_type != OP_RV2GV)
5dc0d613 4634 bad_type(arg, "symbol", gv_ename(namegv), o2);
4633a7c4
LW		 4635 goto wrapref;
4636 case '&':
11343788 4637 if (o2->op_type != OP_RV2CV)
5dc0d613 4638 bad_type(arg, "sub", gv_ename(namegv), o2);
4633a7c4
LW		 4639 goto wrapref;
4640 case '$':
11343788 4641 if (o2->op_type != OP_RV2SV && o2->op_type != OP_PADSV)
5dc0d613 4642 bad_type(arg, "scalar", gv_ename(namegv), o2);
4633a7c4
LW		 4643 goto wrapref;
4644 case '@':
11343788 4645 if (o2->op_type != OP_RV2AV && o2->op_type != OP_PADAV)
5dc0d613 4646 bad_type(arg, "array", gv_ename(namegv), o2);
4633a7c4
LW		 4647 goto wrapref;
4648 case '%':
11343788 4649 if (o2->op_type != OP_RV2HV && o2->op_type != OP_PADHV)
5dc0d613 4650 bad_type(arg, "hash", gv_ename(namegv), o2);
4633a7c4
LW		 4651 wrapref:
4652 {
11343788 4653 OP* kid = o2;
6fa846a0 4654 OP* sib = kid->op_sibling;
4633a7c4 4655 kid->op_sibling = 0;
6fa846a0
GS		 4656 o2 = newUNOP(OP_REFGEN, 0, kid);
4657 o2->op_sibling = sib;
e858de61 4658 prev->op_sibling = o2;
4633a7c4
LW		 4659 }
4660 break;
4661 default: goto oops;
4662 }
4663 break;
b1cb66bf 4664 case ' ':
4665 proto++;
4666 continue;
4633a7c4
LW		 4667 default:
4668 oops:
4669 croak("Malformed prototype for %s: %s",
46fc3d4c 4670 gv_ename(namegv), SvPV((SV*)cv, na));
4633a7c4
LW		 4671 }
4672 }
4673 else
11343788
MB		 4674 list(o2);
4675 mod(o2, OP_ENTERSUB);
4676 prev = o2;
4677 o2 = o2->op_sibling;
4633a7c4 4678 }
fb73857a 4679 if (proto && !optional &&
4680 (*proto && *proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 4681 return too_few_arguments(o, gv_ename(namegv));
11343788 4682 return o;
79072805
LW		 4683}
4684
4685OP *
8ac85365 4686ck_svconst(OP *o)
8990e307 4687{
11343788
MB		 4688 SvREADONLY_on(cSVOPo->op_sv);
4689 return o;
8990e307
LW		 4690}
4691
4692OP *
8ac85365 4693ck_trunc(OP *o)
79072805 4694{
11343788
MB		 4695 if (o->op_flags & OPf_KIDS) {
4696 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 4697
a0d0e21e
LW		 4698 if (kid->op_type == OP_NULL)
4699 kid = (SVOP*)kid->op_sibling;
4700 if (kid &&
4701 kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE))
11343788 4702 o->op_flags |= OPf_SPECIAL;
79072805 4703 }
11343788 4704 return ck_fun(o);
79072805
LW		 4705}
4706
463ee0b2
LW		 4707/* A peephole optimizer. We visit the ops in the order they're to execute. */
4708
79072805 4709void
8ac85365 4710peep(register OP *o)
79072805 4711{
11343788 4712 dTHR;
79072805 4713 register OP* oldop = 0;
a0d0e21e 4714 if (!o || o->op_seq)
79072805 4715 return;
a0d0e21e 4716 ENTER;
462e5cf6 4717 SAVEOP();
a0d0e21e
LW		 4718 SAVESPTR(curcop);
4719 for (; o; o = o->op_next) {
4720 if (o->op_seq)
4721 break;
c07a80fd 4722 if (!op_seqmax)
4723 op_seqmax++;
a0d0e21e
LW		 4724 op = o;
4725 switch (o->op_type) {
4726 case OP_NEXTSTATE:
4727 case OP_DBSTATE:
4728 curcop = ((COP*)o); /* for warnings */
c07a80fd 4729 o->op_seq = op_seqmax++;
a0d0e21e
LW		 4730 break;
4731
4732 case OP_CONCAT:
4733 case OP_CONST:
4734 case OP_JOIN:
4735 case OP_UC:
4736 case OP_UCFIRST:
4737 case OP_LC:
4738 case OP_LCFIRST:
4739 case OP_QUOTEMETA:
3c4f770c 4740 if (o->op_next && o->op_next->op_type == OP_STRINGIFY)
a0d0e21e 4741 null(o->op_next);
c07a80fd 4742 o->op_seq = op_seqmax++;
a0d0e21e 4743 break;
8990e307 4744 case OP_STUB:
54310121 4745 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
c07a80fd 4746 o->op_seq = op_seqmax++;
54310121 4747 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 4748 }
748a9306 4749 goto nothin;
79072805 4750 case OP_NULL:
748a9306 4751 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
7766148a 4752 curcop = ((COP*)o);
748a9306 4753 goto nothin;
79072805 4754 case OP_SCALAR:
93a17b20 4755 case OP_LINESEQ:
463ee0b2 4756 case OP_SCOPE:
748a9306 4757 nothin:
a0d0e21e
LW		 4758 if (oldop && o->op_next) {
4759 oldop->op_next = o->op_next;
79072805
LW		 4760 continue;
4761 }
c07a80fd 4762 o->op_seq = op_seqmax++;
79072805
LW		 4763 break;
4764
4765 case OP_GV:
a0d0e21e 4766 if (o->op_next->op_type == OP_RV2SV) {
5f05dabc 4767 if (!(o->op_next->op_private & OPpDEREF)) {
a0d0e21e
LW		 4768 null(o->op_next);
4769 o->op_private |= o->op_next->op_private & OPpLVAL_INTRO;
4770 o->op_next = o->op_next->op_next;
4771 o->op_type = OP_GVSV;
4772 o->op_ppaddr = ppaddr[OP_GVSV];
8990e307
LW		 4773 }
4774 }
a0d0e21e
LW		 4775 else if (o->op_next->op_type == OP_RV2AV) {
4776 OP* pop = o->op_next->op_next;
4777 IV i;
8990e307 4778 if (pop->op_type == OP_CONST &&
e858de61 4779 (op = pop->op_next) &&
8990e307 4780 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 4781 !(pop->op_next->op_private &
68dc0745 4782 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF)) &&
a0d0e21e
LW		 4783 (i = SvIV(((SVOP*)pop)->op_sv) - compiling.cop_arybase)
4784 <= 255 &&
8990e307
LW		 4785 i >= 0)
4786 {
748a9306 4787 SvREFCNT_dec(((SVOP*)pop)->op_sv);
a0d0e21e 4788 null(o->op_next);
8990e307
LW		 4789 null(pop->op_next);
4790 null(pop);
a0d0e21e
LW		 4791 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
4792 o->op_next = pop->op_next->op_next;
4793 o->op_type = OP_AELEMFAST;
4794 o->op_ppaddr = ppaddr[OP_AELEMFAST];
4795 o->op_private = (U8)i;
a6006777 4796 GvAVn(((GVOP*)o)->op_gv);
8990e307 4797 }
79072805 4798 }
c07a80fd 4799 o->op_seq = op_seqmax++;
79072805
LW		 4800 break;
4801
af41f3ca
MB		 4802 case OP_PADAV:
4803 if (o->op_next->op_type == OP_RV2AV
4804 && (o->op_next->op_flags && OPf_REF))
4805 {
4806 null(o->op_next);
4807 o->op_next = o->op_next->op_next;
4808 }
4809 break;
aeea060c 4810
af41f3ca
MB		 4811 case OP_PADHV:
4812 if (o->op_next->op_type == OP_RV2HV
4813 && (o->op_next->op_flags && OPf_REF))
4814 {
4815 null(o->op_next);
4816 o->op_next = o->op_next->op_next;
4817 }
4818 break;
4819
a0d0e21e 4820 case OP_MAPWHILE:
79072805
LW		 4821 case OP_GREPWHILE:
4822 case OP_AND:
4823 case OP_OR:
c07a80fd 4824 o->op_seq = op_seqmax++;
fd4d1407
IZ		 4825 while (cLOGOP->op_other->op_type == OP_NULL)
4826 cLOGOP->op_other = cLOGOP->op_other->op_next;
79072805
LW		 4827 peep(cLOGOP->op_other);
4828 break;
4829
4830 case OP_COND_EXPR:
c07a80fd 4831 o->op_seq = op_seqmax++;
79072805
LW		 4832 peep(cCONDOP->op_true);
4833 peep(cCONDOP->op_false);
4834 break;
4835
4836 case OP_ENTERLOOP:
c07a80fd 4837 o->op_seq = op_seqmax++;
79072805
LW		 4838 peep(cLOOP->op_redoop);
4839 peep(cLOOP->op_nextop);
4840 peep(cLOOP->op_lastop);
4841 break;
4842
4843 case OP_MATCH:
4844 case OP_SUBST:
c07a80fd 4845 o->op_seq = op_seqmax++;
a0d0e21e 4846 peep(cPMOP->op_pmreplstart);
79072805
LW		 4847 break;
4848
a0d0e21e 4849 case OP_EXEC:
c07a80fd 4850 o->op_seq = op_seqmax++;
a0d0e21e
LW		 4851 if (dowarn && o->op_next && o->op_next->op_type == OP_NEXTSTATE) {
4852 if (o->op_next->op_sibling &&
4853 o->op_next->op_sibling->op_type != OP_DIE) {
4854 line_t oldline = curcop->cop_line;
4855
4856 curcop->cop_line = ((COP*)o->op_next)->cop_line;
4857 warn("Statement unlikely to be reached");
4858 warn("(Maybe you meant system() when you said exec()?)\n");
4859 curcop->cop_line = oldline;
4860 }
4861 }
4862 break;
aeea060c 4863
c750a3ec
MB		 4864 case OP_HELEM: {
4865 UNOP *rop;
4866 SV *lexname;
4867 GV **fields;
4868 SV **svp, **indsvp;
4869 I32 ind;
4870 char *key;
4871 STRLEN keylen;
aeea060c 4872
c750a3ec
MB		 4873 if (o->op_private & (OPpDEREF_HV|OPpDEREF_AV|OPpLVAL_INTRO)
4874 || ((BINOP*)o)->op_last->op_type != OP_CONST)
4875 break;
4876 rop = (UNOP*)((BINOP*)o)->op_first;
4877 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
4878 break;
4879 lexname = *av_fetch(comppad_name, rop->op_first->op_targ, TRUE);
4880 if (!SvOBJECT(lexname))
4881 break;
5196be3e 4882 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
c750a3ec
MB		 4883 if (!fields || !GvHV(*fields))
4884 break;
4885 svp = &((SVOP*)((BINOP*)o)->op_last)->op_sv;
4886 key = SvPV(*svp, keylen);
4887 indsvp = hv_fetch(GvHV(*fields), key, keylen, FALSE);
4888 if (!indsvp) {
4889 croak("No such field \"%s\" in variable %s of type %s",
4890 key, SvPV(lexname, na), HvNAME(SvSTASH(lexname)));
4891 }
4892 ind = SvIV(*indsvp);
4893 if (ind < 1)
4894 croak("Bad index while coercing array into hash");
4895 rop->op_type = OP_RV2AV;
4896 rop->op_ppaddr = ppaddr[OP_RV2AV];
4897 o->op_type = OP_AELEM;
4898 o->op_ppaddr = ppaddr[OP_AELEM];
4899 SvREFCNT_dec(*svp);
4900 *svp = newSViv(ind);
4901 break;
4902 }
4903
79072805 4904 default:
c07a80fd 4905 o->op_seq = op_seqmax++;
79072805
LW		 4906 break;
4907 }
a0d0e21e 4908 oldop = o;
79072805 4909 }
a0d0e21e 4910 LEAVE;
79072805 4911}
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