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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
HS		 89 if (type == OP_ENTERSUB || type == OP_RV2HV || type == OP_PADHV) {
90 SV *msg = sv_2mortal(
91 newSVpvf("(Did you mean $ or @ instead of %c?)\n",
92 type == OP_ENTERSUB ? '&' : '%'));
93 if (in_eval & 2)
94 warn("%_", msg);
95 else if (in_eval)
96 sv_catsv(GvSV(errgv), msg);
97 else
98 PerlIO_write(PerlIO_stderr(), SvPVX(msg), SvCUR(msg));
99 }
a0d0e21e
LW		 100 }
101}
102
79072805
LW		 103/* "register" allocation */
104
105PADOFFSET
8ac85365 106pad_allocmy(char *name)
93a17b20 107{
11343788 108 dTHR;
a0d0e21e
LW		 109 PADOFFSET off;
110 SV *sv;
111
112 if (!(isALPHA(name[1]) || name[1] == '_' && (int)strlen(name) > 2)) {
46fc3d4c 113 if (!isPRINT(name[1])) {
114 name[3] = '\0';
115 name[2] = toCTRL(name[1]);
116 name[1] = '^';
117 }
a0d0e21e
LW		 118 croak("Can't use global %s in \"my\"",name);
119 }
93965878 120 if (dowarn && AvFILLp(comppad_name) >= 0) {
b1cb66bf 121 SV **svp = AvARRAY(comppad_name);
93965878 122 for (off = AvFILLp(comppad_name); off > comppad_name_floor; off--) {
b1cb66bf 123 if ((sv = svp[off])
124 && sv != &sv_undef
125 && SvIVX(sv) == 999999999 /* var is in open scope */
126 && strEQ(name, SvPVX(sv)))
127 {
128 warn("\"my\" variable %s masks earlier declaration in same scope", name);
129 break;
130 }
131 }
132 }
a0d0e21e
LW		 133 off = pad_alloc(OP_PADSV, SVs_PADMY);
134 sv = NEWSV(1102,0);
93a17b20
LW		 135 sv_upgrade(sv, SVt_PVNV);
136 sv_setpv(sv, name);
c750a3ec
MB		 137 if (in_my_stash) {
138 if (*name != '$')
139 croak("Can't declare class for non-scalar %s in \"my\"",name);
140 SvOBJECT_on(sv);
141 (void)SvUPGRADE(sv, SVt_PVMG);
142 SvSTASH(sv) = (HV*)SvREFCNT_inc(in_my_stash);
143 sv_objcount++;
144 }
8990e307 145 av_store(comppad_name, off, sv);
748a9306 146 SvNVX(sv) = (double)999999999;
8990e307
LW		 147 SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
148 if (!min_intro_pending)
149 min_intro_pending = off;
150 max_intro_pending = off;
93a17b20 151 if (*name == '@')
463ee0b2 152 av_store(comppad, off, (SV*)newAV());
93a17b20 153 else if (*name == '%')
463ee0b2 154 av_store(comppad, off, (SV*)newHV());
ed6116ce 155 SvPADMY_on(curpad[off]);
93a17b20
LW		 156 return off;
157}
158
748a9306 159static PADOFFSET
bbce6d69 160pad_findlex(char *name, PADOFFSET newoff, U32 seq, CV* startcv, I32 cx_ix)
93a17b20 161{
11343788 162 dTHR;
748a9306 163 CV *cv;
93a17b20
LW		 164 I32 off;
165 SV *sv;
93a17b20 166 register I32 i;
c09156bb 167 register PERL_CONTEXT *cx;
a0d0e21e 168 int saweval;
93a17b20 169
748a9306 170 for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
4fdae800 171 AV *curlist = CvPADLIST(cv);
172 SV **svp = av_fetch(curlist, 0, FALSE);
748a9306 173 AV *curname;
4fdae800 174
748a9306 175 if (!svp || *svp == &sv_undef)
4633a7c4 176 continue;
748a9306
LW		 177 curname = (AV*)*svp;
178 svp = AvARRAY(curname);
93965878 179 for (off = AvFILLp(curname); off > 0; off--) {
748a9306
LW		 180 if ((sv = svp[off]) &&
181 sv != &sv_undef &&
182 seq <= SvIVX(sv) &&
13826f2c 183 seq > I_32(SvNVX(sv)) &&
748a9306
LW		 184 strEQ(SvPVX(sv), name))
185 {
5f05dabc 186 I32 depth;
187 AV *oldpad;
188 SV *oldsv;
189
190 depth = CvDEPTH(cv);
191 if (!depth) {
9607fc9c 192 if (newoff) {
193 if (SvFAKE(sv))
194 continue;
4fdae800 195 return 0; /* don't clone from inactive stack frame */
9607fc9c 196 }
5f05dabc 197 depth = 1;
198 }
199 oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
200 oldsv = *av_fetch(oldpad, off, TRUE);
748a9306 201 if (!newoff) { /* Not a mere clone operation. */
9607fc9c 202 SV *namesv = NEWSV(1103,0);
748a9306 203 newoff = pad_alloc(OP_PADSV, SVs_PADMY);
9607fc9c 204 sv_upgrade(namesv, SVt_PVNV);
205 sv_setpv(namesv, name);
206 av_store(comppad_name, newoff, namesv);
207 SvNVX(namesv) = (double)curcop->cop_seq;
208 SvIVX(namesv) = 999999999; /* A ref, intro immediately */
209 SvFAKE_on(namesv); /* A ref, not a real var */
774d564b 210 if (CvANON(compcv) || SvTYPE(compcv) == SVt_PVFM) {
28757baa 211 /* "It's closures all the way down." */
212 CvCLONE_on(compcv);
54310121 213 if (cv == startcv) {
214 if (CvANON(compcv))
215 oldsv = Nullsv; /* no need to keep ref */
216 }
217 else {
28757baa 218 CV *bcv;
219 for (bcv = startcv;
220 bcv && bcv != cv && !CvCLONE(bcv);
221 bcv = CvOUTSIDE(bcv)) {
222 if (CvANON(bcv))
223 CvCLONE_on(bcv);
224 else {
774d564b 225 if (dowarn && !CvUNIQUE(cv))
44a8e56a 226 warn(
227 "Variable \"%s\" may be unavailable",
28757baa 228 name);
229 break;
230 }
231 }
232 }
233 }
44a8e56a 234 else if (!CvUNIQUE(compcv)) {
9607fc9c 235 if (dowarn && !SvFAKE(sv) && !CvUNIQUE(cv))
44a8e56a 236 warn("Variable \"%s\" will not stay shared", name);
5f05dabc 237 }
748a9306 238 }
199100c8 239 av_store(comppad, newoff, SvREFCNT_inc(oldsv));
748a9306
LW		 240 return newoff;
241 }
93a17b20
LW		 242 }
243 }
244
245 /* Nothing in current lexical context--try eval's context, if any.
246 * This is necessary to let the perldb get at lexically scoped variables.
247 * XXX This will also probably interact badly with eval tree caching.
248 */
249
a0d0e21e 250 saweval = 0;
748a9306 251 for (i = cx_ix; i >= 0; i--) {
93a17b20
LW		 252 cx = &cxstack[i];
253 switch (cx->cx_type) {
254 default:
748a9306
LW		 255 if (i == 0 && saweval) {
256 seq = cxstack[saweval].blk_oldcop->cop_seq;
257 return pad_findlex(name, newoff, seq, main_cv, 0);
258 }
93a17b20
LW		 259 break;
260 case CXt_EVAL:
44a8e56a 261 switch (cx->blk_eval.old_op_type) {
262 case OP_ENTEREVAL:
263 saweval = i;
264 break;
265 case OP_REQUIRE:
266 /* require must have its own scope */
267 return 0;
268 }
93a17b20
LW		 269 break;
270 case CXt_SUB:
271 if (!saweval)
272 return 0;
273 cv = cx->blk_sub.cv;
748a9306
LW		 274 if (debstash && CvSTASH(cv) == debstash) { /* ignore DB'* scope */
275 saweval = i; /* so we know where we were called from */
93a17b20 276 continue;
93a17b20 277 }
748a9306
LW		 278 seq = cxstack[saweval].blk_oldcop->cop_seq;
279 return pad_findlex(name, newoff, seq, cv, i-1);
93a17b20
LW		 280 }
281 }
282
748a9306
LW		 283 return 0;
284}
a0d0e21e 285
748a9306 286PADOFFSET
8ac85365 287pad_findmy(char *name)
748a9306 288{
11343788 289 dTHR;
748a9306 290 I32 off;
54310121 291 I32 pendoff = 0;
748a9306
LW		 292 SV *sv;
293 SV **svp = AvARRAY(comppad_name);
bbce6d69 294 U32 seq = cop_seqmax;
748a9306 295
11343788
MB		 296#ifdef USE_THREADS
297 /*
298 * Special case to get lexical (and hence per-thread) @_.
299 * XXX I need to find out how to tell at parse-time whether use
300 * of @_ should refer to a lexical (from a sub) or defgv (global
301 * scope and maybe weird sub-ish things like formats). See
302 * startsub in perly.y. It's possible that @_ could be lexical
303 * (at least from subs) even in non-threaded perl.
304 */
305 if (strEQ(name, "@_"))
306 return 0; /* success. (NOT_IN_PAD indicates failure) */
307#endif /* USE_THREADS */
308
748a9306 309 /* The one we're looking for is probably just before comppad_name_fill. */
93965878 310 for (off = AvFILLp(comppad_name); off > 0; off--) {
a0d0e21e
LW		 311 if ((sv = svp[off]) &&
312 sv != &sv_undef &&
54310121 313 (!SvIVX(sv) ||
314 (seq <= SvIVX(sv) &&
315 seq > I_32(SvNVX(sv)))) &&
a0d0e21e
LW		 316 strEQ(SvPVX(sv), name))
317 {
54310121 318 if (SvIVX(sv))
319 return (PADOFFSET)off;
320 pendoff = off; /* this pending def. will override import */
a0d0e21e
LW		 321 }
322 }
748a9306
LW		 323
324 /* See if it's in a nested scope */
325 off = pad_findlex(name, 0, seq, CvOUTSIDE(compcv), cxstack_ix);
54310121 326 if (off) {
327 /* If there is a pending local definition, this new alias must die */
328 if (pendoff)
329 SvIVX(AvARRAY(comppad_name)[off]) = seq;
11343788 330 return off; /* pad_findlex returns 0 for failure...*/
54310121 331 }
11343788 332 return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */
93a17b20
LW		 333}
334
335void
8ac85365 336pad_leavemy(I32 fill)
93a17b20
LW		 337{
338 I32 off;
8990e307 339 SV **svp = AvARRAY(comppad_name);
93a17b20 340 SV *sv;
8990e307
LW		 341 if (min_intro_pending && fill < min_intro_pending) {
342 for (off = max_intro_pending; off >= min_intro_pending; off--) {
a0d0e21e 343 if ((sv = svp[off]) && sv != &sv_undef)
8990e307
LW		 344 warn("%s never introduced", SvPVX(sv));
345 }
346 }
347 /* "Deintroduce" my variables that are leaving with this scope. */
93965878 348 for (off = AvFILLp(comppad_name); off > fill; off--) {
748a9306 349 if ((sv = svp[off]) && sv != &sv_undef && SvIVX(sv) == 999999999)
463ee0b2 350 SvIVX(sv) = cop_seqmax;
93a17b20
LW		 351 }
352}
353
354PADOFFSET
8ac85365 355pad_alloc(I32 optype, U32 tmptype)
79072805 356{
11343788 357 dTHR;
79072805
LW		 358 SV *sv;
359 I32 retval;
360
361 if (AvARRAY(comppad) != curpad)
463ee0b2 362 croak("panic: pad_alloc");
a0d0e21e
LW		 363 if (pad_reset_pending)
364 pad_reset();
ed6116ce 365 if (tmptype & SVs_PADMY) {
79072805 366 do {
93965878 367 sv = *av_fetch(comppad, AvFILLp(comppad) + 1, TRUE);
ed6116ce 368 } while (SvPADBUSY(sv)); /* need a fresh one */
93965878 369 retval = AvFILLp(comppad);
79072805
LW		 370 }
371 else {
bbce6d69 372 SV **names = AvARRAY(comppad_name);
93965878 373 SSize_t names_fill = AvFILLp(comppad_name);
bbce6d69 374 for (;;) {
375 /*
376 * "foreach" index vars temporarily become aliases to non-"my"
377 * values. Thus we must skip, not just pad values that are
378 * marked as current pad values, but also those with names.
379 */
380 if (++padix <= names_fill &&
381 (sv = names[padix]) && sv != &sv_undef)
382 continue;
383 sv = *av_fetch(comppad, padix, TRUE);
384 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
385 break;
386 }
79072805
LW		 387 retval = padix;
388 }
8990e307 389 SvFLAGS(sv) |= tmptype;
79072805 390 curpad = AvARRAY(comppad);
11343788 391#ifdef USE_THREADS
5dc0d613
MB		 392 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
393 (unsigned long) thr, (unsigned long) curpad,
394 (long) retval, op_name[optype]));
11343788 395#else
d9bb4600
GS		 396 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx alloc %ld for %s\n",
397 (unsigned long) curpad,
5dc0d613 398 (long) retval, op_name[optype]));
11343788 399#endif /* USE_THREADS */
79072805
LW		 400 return (PADOFFSET)retval;
401}
402
403SV *
8990e307 404pad_sv(PADOFFSET po)
79072805 405{
11343788
MB		 406 dTHR;
407#ifdef USE_THREADS
5dc0d613
MB		 408 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
409 (unsigned long) thr, (unsigned long) curpad, po));
11343788 410#else
79072805 411 if (!po)
463ee0b2 412 croak("panic: pad_sv po");
d9bb4600
GS		 413 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx sv %d\n",
414 (unsigned long) curpad, po));
11343788 415#endif /* USE_THREADS */
79072805
LW		 416 return curpad[po]; /* eventually we'll turn this into a macro */
417}
418
419void
8990e307 420pad_free(PADOFFSET po)
79072805 421{
11343788 422 dTHR;
a0d0e21e
LW		 423 if (!curpad)
424 return;
79072805 425 if (AvARRAY(comppad) != curpad)
463ee0b2 426 croak("panic: pad_free curpad");
79072805 427 if (!po)
463ee0b2 428 croak("panic: pad_free po");
11343788 429#ifdef USE_THREADS
5dc0d613
MB		 430 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
431 (unsigned long) thr, (unsigned long) curpad, po));
11343788 432#else
d9bb4600
GS		 433 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx free %d\n",
434 (unsigned long) curpad, po));
11343788 435#endif /* USE_THREADS */
a0d0e21e 436 if (curpad[po] && curpad[po] != &sv_undef)
ed6116ce 437 SvPADTMP_off(curpad[po]);
a0d0e21e 438 if ((I32)po < padix)
79072805
LW		 439 padix = po - 1;
440}
441
442void
8990e307 443pad_swipe(PADOFFSET po)
79072805 444{
11343788 445 dTHR;
79072805 446 if (AvARRAY(comppad) != curpad)
463ee0b2 447 croak("panic: pad_swipe curpad");
79072805 448 if (!po)
463ee0b2 449 croak("panic: pad_swipe po");
11343788 450#ifdef USE_THREADS
5dc0d613
MB		 451 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
452 (unsigned long) thr, (unsigned long) curpad, po));
11343788 453#else
d9bb4600
GS		 454 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx swipe %d\n",
455 (unsigned long) curpad, po));
11343788 456#endif /* USE_THREADS */
ed6116ce 457 SvPADTMP_off(curpad[po]);
a0d0e21e
LW		 458 curpad[po] = NEWSV(1107,0);
459 SvPADTMP_on(curpad[po]);
460 if ((I32)po < padix)
79072805
LW		 461 padix = po - 1;
462}
463
d9bb4600
GS		 464/* XXX pad_reset() is currently disabled because it results in serious bugs.
465 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
466 * on the stack by OPs that use them, there are several ways to get an alias
467 * to a shared TARG. Such an alias will change randomly and unpredictably.
468 * We avoid doing this until we can think of a Better Way.
469 * GSAR 97-10-29 */
79072805 470void
8ac85365 471pad_reset(void)
79072805 472{
d9bb4600 473#ifdef USE_BROKEN_PAD_RESET
11343788 474 dTHR;
79072805
LW		 475 register I32 po;
476
477 if (AvARRAY(comppad) != curpad)
463ee0b2 478 croak("panic: pad_reset curpad");
11343788 479#ifdef USE_THREADS
5dc0d613
MB		 480 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
481 (unsigned long) thr, (unsigned long) curpad));
11343788 482#else
d9bb4600
GS		 483 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx reset\n",
484 (unsigned long) curpad));
11343788 485#endif /* USE_THREADS */
748a9306
LW		 486 if (!tainting) { /* Can't mix tainted and non-tainted temporaries. */
487 for (po = AvMAX(comppad); po > padix_floor; po--) {
ff0cee69 488 if (curpad[po] && !SvIMMORTAL(curpad[po]))
748a9306
LW		 489 SvPADTMP_off(curpad[po]);
490 }
491 padix = padix_floor;
79072805 492 }
d9bb4600 493#endif
a0d0e21e 494 pad_reset_pending = FALSE;
79072805
LW		 495}
496
a863c7d1 497#ifdef USE_THREADS
54b9620d 498/* find_threadsv is not reentrant */
a863c7d1 499PADOFFSET
54b9620d 500find_threadsv(char *name)
a863c7d1
MB		 501{
502 dTHR;
503 char *p;
504 PADOFFSET key;
554b3eca 505 SV **svp;
54b9620d
MB		 506 /* We currently only handle names of a single character */
507 p = strchr(threadsv_names, *name);
a863c7d1
MB		 508 if (!p)
509 return NOT_IN_PAD;
54b9620d
MB		 510 key = p - threadsv_names;
511 svp = av_fetch(thr->threadsv, key, FALSE);
554b3eca
MB		 512 if (!svp) {
513 SV *sv = NEWSV(0, 0);
54b9620d 514 av_store(thr->threadsv, key, sv);
940cb80d 515 thr->threadsvp = AvARRAY(thr->threadsv);
554b3eca
MB		 516 /*
517 * Some magic variables used to be automagically initialised
518 * in gv_fetchpv. Those which are now per-thread magicals get
519 * initialised here instead.
520 */
521 switch (*name) {
54b9620d
MB		 522 case '_':
523 break;
554b3eca
MB		 524 case ';':
525 sv_setpv(sv, "\034");
54b9620d 526 sv_magic(sv, 0, 0, name, 1);
554b3eca 527 break;
c277df42
IZ		 528 case '&':
529 case '`':
530 case '\'':
531 sawampersand = TRUE;
532 SvREADONLY_on(sv);
d8b5173a 533 /* FALL THROUGH */
54b9620d
MB		 534 default:
535 sv_magic(sv, 0, 0, name, 1);
554b3eca 536 }
a863c7d1 537 DEBUG_L(PerlIO_printf(PerlIO_stderr(),
54b9620d 538 "find_threadsv: new SV %p for $%s%c\n",
554b3eca
MB		 539 sv, (*name < 32) ? "^" : "",
540 (*name < 32) ? toCTRL(*name) : *name));
a863c7d1
MB		 541 }
542 return key;
543}
544#endif /* USE_THREADS */
545
79072805
LW		 546/* Destructor */
547
548void
8ac85365 549op_free(OP *o)
79072805 550{
85e6fe83 551 register OP *kid, *nextkid;
79072805 552
5dc0d613 553 if (!o || o->op_seq == (U16)-1)
79072805
LW		 554 return;
555
11343788
MB		 556 if (o->op_flags & OPf_KIDS) {
557 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 558 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 559 op_free(kid);
85e6fe83 560 }
79072805
LW		 561 }
562
11343788 563 switch (o->op_type) {
8990e307 564 case OP_NULL:
11343788 565 o->op_targ = 0; /* Was holding old type, if any. */
8990e307 566 break;
a0d0e21e 567 case OP_ENTEREVAL:
11343788 568 o->op_targ = 0; /* Was holding hints. */
a0d0e21e 569 break;
554b3eca 570#ifdef USE_THREADS
2faa37cc 571 case OP_THREADSV:
54b9620d 572 o->op_targ = 0; /* Was holding index into thr->threadsv AV. */
554b3eca
MB		 573 break;
574#endif /* USE_THREADS */
a6006777 575 default:
5196be3e 576 if (!(o->op_flags & OPf_REF) || (check[o->op_type] != ck_ftst))
a6006777 577 break;
578 /* FALL THROUGH */
463ee0b2 579 case OP_GVSV:
79072805 580 case OP_GV:
a6006777 581 case OP_AELEMFAST:
11343788 582 SvREFCNT_dec(cGVOPo->op_gv);
8990e307
LW		 583 break;
584 case OP_NEXTSTATE:
585 case OP_DBSTATE:
5196be3e 586 Safefree(cCOPo->cop_label);
11343788 587 SvREFCNT_dec(cCOPo->cop_filegv);
79072805
LW		 588 break;
589 case OP_CONST:
11343788 590 SvREFCNT_dec(cSVOPo->op_sv);
79072805 591 break;
748a9306
LW		 592 case OP_GOTO:
593 case OP_NEXT:
594 case OP_LAST:
595 case OP_REDO:
11343788 596 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 597 break;
598 /* FALL THROUGH */
a0d0e21e 599 case OP_TRANS:
11343788 600 Safefree(cPVOPo->op_pv);
a0d0e21e
LW		 601 break;
602 case OP_SUBST:
11343788 603 op_free(cPMOPo->op_pmreplroot);
a0d0e21e 604 /* FALL THROUGH */
748a9306 605 case OP_PUSHRE:
a0d0e21e 606 case OP_MATCH:
c277df42 607 ReREFCNT_dec(cPMOPo->op_pmregexp);
a0d0e21e 608 break;
79072805
LW		 609 }
610
11343788
MB		 611 if (o->op_targ > 0)
612 pad_free(o->op_targ);
8990e307 613
11343788 614 Safefree(o);
79072805
LW		 615}
616
8990e307 617static void
8ac85365 618null(OP *o)
8990e307 619{
54b9620d 620 if (o->op_type != OP_NULL && o->op_type != OP_THREADSV && o->op_targ > 0)
11343788
MB		 621 pad_free(o->op_targ);
622 o->op_targ = o->op_type;
623 o->op_type = OP_NULL;
624 o->op_ppaddr = ppaddr[OP_NULL];
8990e307
LW		 625}
626
79072805
LW		 627/* Contextualizers */
628
463ee0b2 629#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 630
631OP *
8ac85365 632linklist(OP *o)
79072805
LW		 633{
634 register OP *kid;
635
11343788
MB		 636 if (o->op_next)
637 return o->op_next;
79072805
LW		 638
639 /* establish postfix order */
11343788
MB		 640 if (cUNOPo->op_first) {
641 o->op_next = LINKLIST(cUNOPo->op_first);
642 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 643 if (kid->op_sibling)
644 kid->op_next = LINKLIST(kid->op_sibling);
645 else
11343788 646 kid->op_next = o;
79072805
LW		 647 }
648 }
649 else
11343788 650 o->op_next = o;
79072805 651
11343788 652 return o->op_next;
79072805
LW		 653}
654
655OP *
8ac85365 656scalarkids(OP *o)
79072805
LW		 657{
658 OP *kid;
11343788
MB		 659 if (o && o->op_flags & OPf_KIDS) {
660 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 661 scalar(kid);
662 }
11343788 663 return o;
79072805
LW		 664}
665
a0d0e21e 666static OP *
8ac85365 667scalarboolean(OP *o)
8990e307
LW		 668{
669 if (dowarn &&
11343788 670 o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
0f15f207 671 dTHR;
a0d0e21e
LW		 672 line_t oldline = curcop->cop_line;
673
674 if (copline != NOLINE)
675 curcop->cop_line = copline;
676 warn("Found = in conditional, should be ==");
677 curcop->cop_line = oldline;
678 }
11343788 679 return scalar(o);
8990e307
LW		 680}
681
682OP *
8ac85365 683scalar(OP *o)
79072805
LW		 684{
685 OP *kid;
686
a0d0e21e 687 /* assumes no premature commitment */
5dc0d613
MB		 688 if (!o || (o->op_flags & OPf_WANT) || error_count
689 || o->op_type == OP_RETURN)
11343788 690 return o;
79072805 691
5dc0d613 692 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 693
11343788 694 switch (o->op_type) {
79072805 695 case OP_REPEAT:
11343788
MB		 696 if (o->op_private & OPpREPEAT_DOLIST)
697 null(((LISTOP*)cBINOPo->op_first)->op_first);
698 scalar(cBINOPo->op_first);
8990e307 699 break;
79072805
LW		 700 case OP_OR:
701 case OP_AND:
702 case OP_COND_EXPR:
11343788 703 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 704 scalar(kid);
79072805 705 break;
a0d0e21e 706 case OP_SPLIT:
11343788 707 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 708 if (!kPMOP->op_pmreplroot)
709 deprecate("implicit split to @_");
710 }
711 /* FALL THROUGH */
79072805
LW		 712 case OP_MATCH:
713 case OP_SUBST:
714 case OP_NULL:
8990e307 715 default:
11343788
MB		 716 if (o->op_flags & OPf_KIDS) {
717 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 718 scalar(kid);
719 }
79072805
LW		 720 break;
721 case OP_LEAVE:
722 case OP_LEAVETRY:
5dc0d613 723 kid = cLISTOPo->op_first;
54310121 724 scalar(kid);
725 while (kid = kid->op_sibling) {
726 if (kid->op_sibling)
727 scalarvoid(kid);
728 else
729 scalar(kid);
730 }
0f15f207 731 WITH_THR(curcop = &compiling);
54310121 732 break;
748a9306 733 case OP_SCOPE:
79072805 734 case OP_LINESEQ:
8990e307 735 case OP_LIST:
11343788 736 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 737 if (kid->op_sibling)
738 scalarvoid(kid);
739 else
740 scalar(kid);
741 }
0f15f207 742 WITH_THR(curcop = &compiling);
79072805
LW		 743 break;
744 }
11343788 745 return o;
79072805
LW		 746}
747
748OP *
8ac85365 749scalarvoid(OP *o)
79072805
LW		 750{
751 OP *kid;
8990e307
LW		 752 char* useless = 0;
753 SV* sv;
79072805 754
54310121 755 /* assumes no premature commitment */
5dc0d613
MB		 756 if (!o || (o->op_flags & OPf_WANT) == OPf_WANT_LIST || error_count
757 || o->op_type == OP_RETURN)
11343788 758 return o;
79072805 759
5dc0d613 760 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 761
11343788 762 switch (o->op_type) {
79072805 763 default:
11343788 764 if (!(opargs[o->op_type] & OA_FOLDCONST))
8990e307 765 break;
36477c24 766 /* FALL THROUGH */
767 case OP_REPEAT:
11343788 768 if (o->op_flags & OPf_STACKED)
8990e307
LW		 769 break;
770 /* FALL THROUGH */
771 case OP_GVSV:
772 case OP_WANTARRAY:
773 case OP_GV:
774 case OP_PADSV:
775 case OP_PADAV:
776 case OP_PADHV:
777 case OP_PADANY:
778 case OP_AV2ARYLEN:
8990e307 779 case OP_REF:
a0d0e21e
LW		 780 case OP_REFGEN:
781 case OP_SREFGEN:
8990e307
LW		 782 case OP_DEFINED:
783 case OP_HEX:
784 case OP_OCT:
785 case OP_LENGTH:
786 case OP_SUBSTR:
787 case OP_VEC:
788 case OP_INDEX:
789 case OP_RINDEX:
790 case OP_SPRINTF:
791 case OP_AELEM:
792 case OP_AELEMFAST:
793 case OP_ASLICE:
8990e307
LW		 794 case OP_HELEM:
795 case OP_HSLICE:
796 case OP_UNPACK:
797 case OP_PACK:
8990e307
LW		 798 case OP_JOIN:
799 case OP_LSLICE:
800 case OP_ANONLIST:
801 case OP_ANONHASH:
802 case OP_SORT:
803 case OP_REVERSE:
804 case OP_RANGE:
805 case OP_FLIP:
806 case OP_FLOP:
807 case OP_CALLER:
808 case OP_FILENO:
809 case OP_EOF:
810 case OP_TELL:
811 case OP_GETSOCKNAME:
812 case OP_GETPEERNAME:
813 case OP_READLINK:
814 case OP_TELLDIR:
815 case OP_GETPPID:
816 case OP_GETPGRP:
817 case OP_GETPRIORITY:
818 case OP_TIME:
819 case OP_TMS:
820 case OP_LOCALTIME:
821 case OP_GMTIME:
822 case OP_GHBYNAME:
823 case OP_GHBYADDR:
824 case OP_GHOSTENT:
825 case OP_GNBYNAME:
826 case OP_GNBYADDR:
827 case OP_GNETENT:
828 case OP_GPBYNAME:
829 case OP_GPBYNUMBER:
830 case OP_GPROTOENT:
831 case OP_GSBYNAME:
832 case OP_GSBYPORT:
833 case OP_GSERVENT:
834 case OP_GPWNAM:
835 case OP_GPWUID:
836 case OP_GGRNAM:
837 case OP_GGRGID:
838 case OP_GETLOGIN:
11343788
MB		 839 if (!(o->op_private & OPpLVAL_INTRO))
840 useless = op_desc[o->op_type];
8990e307
LW		 841 break;
842
843 case OP_RV2GV:
844 case OP_RV2SV:
845 case OP_RV2AV:
846 case OP_RV2HV:
11343788
MB		 847 if (!(o->op_private & OPpLVAL_INTRO) &&
848 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 849 useless = "a variable";
850 break;
79072805 851
93a17b20 852 case OP_NEXTSTATE:
8990e307 853 case OP_DBSTATE:
0f15f207 854 WITH_THR(curcop = ((COP*)o)); /* for warning below */
93a17b20
LW		 855 break;
856
79072805 857 case OP_CONST:
11343788 858 sv = cSVOPo->op_sv;
8990e307
LW		 859 if (dowarn) {
860 useless = "a constant";
861 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
862 useless = 0;
863 else if (SvPOK(sv)) {
864 if (strnEQ(SvPVX(sv), "di", 2) ||
a0d0e21e 865 strnEQ(SvPVX(sv), "ds", 2) ||
8990e307
LW		 866 strnEQ(SvPVX(sv), "ig", 2))
867 useless = 0;
868 }
869 }
11343788 870 null(o); /* don't execute a constant */
8990e307 871 SvREFCNT_dec(sv); /* don't even remember it */
79072805
LW		 872 break;
873
874 case OP_POSTINC:
11343788
MB		 875 o->op_type = OP_PREINC; /* pre-increment is faster */
876 o->op_ppaddr = ppaddr[OP_PREINC];
79072805
LW		 877 break;
878
879 case OP_POSTDEC:
11343788
MB		 880 o->op_type = OP_PREDEC; /* pre-decrement is faster */
881 o->op_ppaddr = ppaddr[OP_PREDEC];
79072805
LW		 882 break;
883
79072805
LW		 884 case OP_OR:
885 case OP_AND:
886 case OP_COND_EXPR:
11343788 887 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 888 scalarvoid(kid);
889 break;
5aabfad6 890
a0d0e21e 891 case OP_NULL:
11343788 892 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
0f15f207 893 WITH_THR(curcop = ((COP*)o)); /* for warning below */
11343788 894 if (o->op_flags & OPf_STACKED)
a0d0e21e 895 break;
5aabfad6 896 /* FALL THROUGH */
79072805
LW		 897 case OP_ENTERTRY:
898 case OP_ENTER:
899 case OP_SCALAR:
11343788 900 if (!(o->op_flags & OPf_KIDS))
79072805 901 break;
54310121 902 /* FALL THROUGH */
463ee0b2 903 case OP_SCOPE:
79072805
LW		 904 case OP_LEAVE:
905 case OP_LEAVETRY:
a0d0e21e 906 case OP_LEAVELOOP:
79072805 907 case OP_LINESEQ:
79072805 908 case OP_LIST:
11343788 909 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 910 scalarvoid(kid);
911 break;
c90c0ff4 912 case OP_ENTEREVAL:
5196be3e 913 scalarkids(o);
c90c0ff4 914 break;
5aabfad6 915 case OP_REQUIRE:
c90c0ff4 916 /* all requires must return a boolean value */
5196be3e
MB		 917 o->op_flags &= ~OPf_WANT;
918 return scalar(o);
a0d0e21e 919 case OP_SPLIT:
11343788 920 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 921 if (!kPMOP->op_pmreplroot)
922 deprecate("implicit split to @_");
923 }
924 break;
79072805 925 }
8990e307
LW		 926 if (useless && dowarn)
927 warn("Useless use of %s in void context", useless);
11343788 928 return o;
79072805
LW		 929}
930
931OP *
8ac85365 932listkids(OP *o)
79072805
LW		 933{
934 OP *kid;
11343788
MB		 935 if (o && o->op_flags & OPf_KIDS) {
936 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 937 list(kid);
938 }
11343788 939 return o;
79072805
LW		 940}
941
942OP *
8ac85365 943list(OP *o)
79072805
LW		 944{
945 OP *kid;
946
a0d0e21e 947 /* assumes no premature commitment */
5dc0d613
MB		 948 if (!o || (o->op_flags & OPf_WANT) || error_count
949 || o->op_type == OP_RETURN)
11343788 950 return o;
79072805 951
5dc0d613 952 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 953
11343788 954 switch (o->op_type) {
79072805
LW		 955 case OP_FLOP:
956 case OP_REPEAT:
11343788 957 list(cBINOPo->op_first);
79072805
LW		 958 break;
959 case OP_OR:
960 case OP_AND:
961 case OP_COND_EXPR:
11343788 962 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 963 list(kid);
964 break;
965 default:
966 case OP_MATCH:
967 case OP_SUBST:
968 case OP_NULL:
11343788 969 if (!(o->op_flags & OPf_KIDS))
79072805 970 break;
11343788
MB		 971 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
972 list(cBINOPo->op_first);
973 return gen_constant_list(o);
79072805
LW		 974 }
975 case OP_LIST:
11343788 976 listkids(o);
79072805
LW		 977 break;
978 case OP_LEAVE:
979 case OP_LEAVETRY:
5dc0d613 980 kid = cLISTOPo->op_first;
54310121 981 list(kid);
982 while (kid = kid->op_sibling) {
983 if (kid->op_sibling)
984 scalarvoid(kid);
985 else
986 list(kid);
987 }
0f15f207 988 WITH_THR(curcop = &compiling);
54310121 989 break;
748a9306 990 case OP_SCOPE:
79072805 991 case OP_LINESEQ:
11343788 992 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 993 if (kid->op_sibling)
994 scalarvoid(kid);
995 else
996 list(kid);
997 }
0f15f207 998 WITH_THR(curcop = &compiling);
79072805 999 break;
c90c0ff4 1000 case OP_REQUIRE:
1001 /* all requires must return a boolean value */
5196be3e
MB		 1002 o->op_flags &= ~OPf_WANT;
1003 return scalar(o);
79072805 1004 }
11343788 1005 return o;
79072805
LW		 1006}
1007
1008OP *
8ac85365 1009scalarseq(OP *o)
79072805
LW		 1010{
1011 OP *kid;
1012
11343788
MB		 1013 if (o) {
1014 if (o->op_type == OP_LINESEQ ||
1015 o->op_type == OP_SCOPE ||
1016 o->op_type == OP_LEAVE ||
1017 o->op_type == OP_LEAVETRY)
463ee0b2 1018 {
0f15f207 1019 dTHR;
11343788 1020 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1021 if (kid->op_sibling) {
463ee0b2 1022 scalarvoid(kid);
ed6116ce 1023 }
463ee0b2
LW		 1024 }
1025 curcop = &compiling;
79072805 1026 }
11343788 1027 o->op_flags &= ~OPf_PARENS;
85e6fe83 1028 if (hints & HINT_BLOCK_SCOPE)
11343788 1029 o->op_flags |= OPf_PARENS;
79072805 1030 }
8990e307 1031 else
11343788
MB		 1032 o = newOP(OP_STUB, 0);
1033 return o;
79072805
LW		 1034}
1035
a0d0e21e 1036static OP *
8ac85365 1037modkids(OP *o, I32 type)
79072805
LW		 1038{
1039 OP *kid;
11343788
MB		 1040 if (o && o->op_flags & OPf_KIDS) {
1041 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1042 mod(kid, type);
79072805 1043 }
11343788 1044 return o;
79072805
LW		 1045}
1046
463ee0b2 1047static I32 modcount;
79072805
LW		 1048
1049OP *
8ac85365 1050mod(OP *o, I32 type)
79072805 1051{
11343788 1052 dTHR;
79072805
LW		 1053 OP *kid;
1054 SV *sv;
1055
11343788
MB		 1056 if (!o || error_count)
1057 return o;
79072805 1058
11343788 1059 switch (o->op_type) {
68dc0745 1060 case OP_UNDEF:
3e3baf6d 1061 modcount++;
5dc0d613 1062 return o;
a0d0e21e 1063 case OP_CONST:
11343788 1064 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e
LW		 1065 goto nomod;
1066 if (eval_start && eval_start->op_type == OP_CONST) {
1067 compiling.cop_arybase = (I32)SvIV(((SVOP*)eval_start)->op_sv);
1068 eval_start = 0;
1069 }
1070 else if (!type) {
1071 SAVEI32(compiling.cop_arybase);
748a9306 1072 compiling.cop_arybase = 0;
a0d0e21e
LW		 1073 }
1074 else if (type == OP_REFGEN)
1075 goto nomod;
1076 else
1077 croak("That use of $[ is unsupported");
1078 break;
5f05dabc 1079 case OP_STUB:
5196be3e 1080 if (o->op_flags & OPf_PARENS)
5f05dabc 1081 break;
1082 goto nomod;
a0d0e21e
LW		 1083 case OP_ENTERSUB:
1084 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1085 !(o->op_flags & OPf_STACKED)) {
1086 o->op_type = OP_RV2CV; /* entersub => rv2cv */
1087 o->op_ppaddr = ppaddr[OP_RV2CV];
1088 assert(cUNOPo->op_first->op_type == OP_NULL);
1089 null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1090 break;
1091 }
1092 /* FALL THROUGH */
1093 default:
a0d0e21e
LW		 1094 nomod:
1095 /* grep, foreach, subcalls, refgen */
1096 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1097 break;
46fc3d4c 1098 yyerror(form("Can't modify %s in %s",
5dc0d613 1099 op_desc[o->op_type],
46fc3d4c 1100 type ? op_desc[type] : "local"));
11343788 1101 return o;
79072805 1102
a0d0e21e
LW		 1103 case OP_PREINC:
1104 case OP_PREDEC:
1105 case OP_POW:
1106 case OP_MULTIPLY:
1107 case OP_DIVIDE:
1108 case OP_MODULO:
1109 case OP_REPEAT:
1110 case OP_ADD:
1111 case OP_SUBTRACT:
1112 case OP_CONCAT:
1113 case OP_LEFT_SHIFT:
1114 case OP_RIGHT_SHIFT:
1115 case OP_BIT_AND:
1116 case OP_BIT_XOR:
1117 case OP_BIT_OR:
1118 case OP_I_MULTIPLY:
1119 case OP_I_DIVIDE:
1120 case OP_I_MODULO:
1121 case OP_I_ADD:
1122 case OP_I_SUBTRACT:
11343788 1123 if (!(o->op_flags & OPf_STACKED))
a0d0e21e
LW		 1124 goto nomod;
1125 modcount++;
1126 break;
1127
79072805 1128 case OP_COND_EXPR:
11343788 1129 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1130 mod(kid, type);
79072805
LW		 1131 break;
1132
1133 case OP_RV2AV:
1134 case OP_RV2HV:
93af7a87 1135 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1136 croak("Can't localize through a reference");
11343788 1137 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
748a9306 1138 modcount = 10000;
11343788 1139 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1140 }
1141 /* FALL THROUGH */
79072805 1142 case OP_RV2GV:
5dc0d613 1143 if (scalar_mod_type(o, type))
3fe9a6f1 1144 goto nomod;
11343788 1145 ref(cUNOPo->op_first, o->op_type);
79072805
LW		 1146 /* FALL THROUGH */
1147 case OP_AASSIGN:
1148 case OP_ASLICE:
1149 case OP_HSLICE:
93a17b20
LW		 1150 case OP_NEXTSTATE:
1151 case OP_DBSTATE:
a0d0e21e
LW		 1152 case OP_REFGEN:
1153 case OP_CHOMP:
463ee0b2 1154 modcount = 10000;
79072805 1155 break;
463ee0b2 1156 case OP_RV2SV:
11343788 1157 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1158 croak("Can't localize through a reference");
aeea060c 1159 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1160 /* FALL THROUGH */
79072805 1161 case OP_GV:
463ee0b2 1162 case OP_AV2ARYLEN:
85aff577 1163 hints |= HINT_BLOCK_SCOPE;
463ee0b2 1164 case OP_SASSIGN:
8990e307
LW		 1165 case OP_AELEMFAST:
1166 modcount++;
1167 break;
1168
748a9306
LW		 1169 case OP_PADAV:
1170 case OP_PADHV:
1171 modcount = 10000;
5196be3e
MB		 1172 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1173 return o; /* Treat \(@foo) like ordinary list. */
1174 if (scalar_mod_type(o, type))
3fe9a6f1 1175 goto nomod;
748a9306
LW		 1176 /* FALL THROUGH */
1177 case OP_PADSV:
1178 modcount++;
1179 if (!type)
1180 croak("Can't localize lexical variable %s",
11343788 1181 SvPV(*av_fetch(comppad_name, o->op_targ, 4), na));
463ee0b2
LW		 1182 break;
1183
554b3eca 1184#ifdef USE_THREADS
2faa37cc 1185 case OP_THREADSV:
554b3eca 1186 modcount++; /* XXX ??? */
554b3eca
MB		 1187 break;
1188#endif /* USE_THREADS */
1189
748a9306
LW		 1190 case OP_PUSHMARK:
1191 break;
a0d0e21e 1192
69969c6f
SB		 1193 case OP_KEYS:
1194 if (type != OP_SASSIGN)
1195 goto nomod;
5f05dabc 1196 /* FALL THROUGH */
a0d0e21e 1197 case OP_POS:
463ee0b2 1198 case OP_VEC:
a0d0e21e 1199 case OP_SUBSTR:
11343788
MB		 1200 pad_free(o->op_targ);
1201 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1202 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1203 if (o->op_flags & OPf_KIDS)
1204 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1205 break;
a0d0e21e 1206
463ee0b2
LW		 1207 case OP_AELEM:
1208 case OP_HELEM:
11343788 1209 ref(cBINOPo->op_first, o->op_type);
68dc0745 1210 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1211 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1212 o->op_private |= OPpLVAL_DEFER;
a0d0e21e 1213 modcount++;
463ee0b2
LW		 1214 break;
1215
1216 case OP_SCOPE:
1217 case OP_LEAVE:
1218 case OP_ENTER:
11343788
MB		 1219 if (o->op_flags & OPf_KIDS)
1220 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1221 break;
1222
1223 case OP_NULL:
11343788 1224 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1225 break;
11343788
MB		 1226 if (o->op_targ != OP_LIST) {
1227 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1228 break;
1229 }
1230 /* FALL THROUGH */
463ee0b2 1231 case OP_LIST:
11343788 1232 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1233 mod(kid, type);
1234 break;
1235 }
11343788 1236 o->op_flags |= OPf_MOD;
a0d0e21e
LW		 1237
1238 if (type == OP_AASSIGN || type == OP_SASSIGN)
11343788 1239 o->op_flags |= OPf_SPECIAL|OPf_REF;
a0d0e21e 1240 else if (!type) {
11343788
MB		 1241 o->op_private |= OPpLVAL_INTRO;
1242 o->op_flags &= ~OPf_SPECIAL;
463ee0b2 1243 }
a0d0e21e 1244 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
11343788
MB		 1245 o->op_flags |= OPf_REF;
1246 return o;
463ee0b2
LW		 1247}
1248
3fe9a6f1 1249static bool
8ac85365 1250scalar_mod_type(OP *o, I32 type)
3fe9a6f1 1251{
1252 switch (type) {
1253 case OP_SASSIGN:
5196be3e 1254 if (o->op_type == OP_RV2GV)
3fe9a6f1 1255 return FALSE;
1256 /* FALL THROUGH */
1257 case OP_PREINC:
1258 case OP_PREDEC:
1259 case OP_POSTINC:
1260 case OP_POSTDEC:
1261 case OP_I_PREINC:
1262 case OP_I_PREDEC:
1263 case OP_I_POSTINC:
1264 case OP_I_POSTDEC:
1265 case OP_POW:
1266 case OP_MULTIPLY:
1267 case OP_DIVIDE:
1268 case OP_MODULO:
1269 case OP_REPEAT:
1270 case OP_ADD:
1271 case OP_SUBTRACT:
1272 case OP_I_MULTIPLY:
1273 case OP_I_DIVIDE:
1274 case OP_I_MODULO:
1275 case OP_I_ADD:
1276 case OP_I_SUBTRACT:
1277 case OP_LEFT_SHIFT:
1278 case OP_RIGHT_SHIFT:
1279 case OP_BIT_AND:
1280 case OP_BIT_XOR:
1281 case OP_BIT_OR:
1282 case OP_CONCAT:
1283 case OP_SUBST:
1284 case OP_TRANS:
1285 case OP_ANDASSIGN: /* may work later */
1286 case OP_ORASSIGN: /* may work later */
1287 return TRUE;
1288 default:
1289 return FALSE;
1290 }
1291}
1292
463ee0b2 1293OP *
8ac85365 1294refkids(OP *o, I32 type)
463ee0b2
LW		 1295{
1296 OP *kid;
11343788
MB		 1297 if (o && o->op_flags & OPf_KIDS) {
1298 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1299 ref(kid, type);
1300 }
11343788 1301 return o;
463ee0b2
LW		 1302}
1303
1304OP *
8ac85365 1305ref(OP *o, I32 type)
463ee0b2
LW		 1306{
1307 OP *kid;
463ee0b2 1308
11343788
MB		 1309 if (!o || error_count)
1310 return o;
463ee0b2 1311
11343788 1312 switch (o->op_type) {
a0d0e21e 1313 case OP_ENTERSUB:
e55aaa0e 1314 if ((type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1315 !(o->op_flags & OPf_STACKED)) {
1316 o->op_type = OP_RV2CV; /* entersub => rv2cv */
1317 o->op_ppaddr = ppaddr[OP_RV2CV];
1318 assert(cUNOPo->op_first->op_type == OP_NULL);
1319 null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
1320 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1321 }
1322 break;
aeea060c 1323
463ee0b2 1324 case OP_COND_EXPR:
11343788 1325 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1326 ref(kid, type);
1327 break;
8990e307 1328 case OP_RV2SV:
11343788 1329 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1330 /* FALL THROUGH */
1331 case OP_PADSV:
5f05dabc 1332 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1333 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1334 : type == OP_RV2HV ? OPpDEREF_HV
1335 : OPpDEREF_SV);
11343788 1336 o->op_flags |= OPf_MOD;
a0d0e21e 1337 }
8990e307
LW		 1338 break;
1339
2faa37cc 1340 case OP_THREADSV:
a863c7d1
MB		 1341 o->op_flags |= OPf_MOD; /* XXX ??? */
1342 break;
1343
463ee0b2
LW		 1344 case OP_RV2AV:
1345 case OP_RV2HV:
aeea060c 1346 o->op_flags |= OPf_REF;
8990e307 1347 /* FALL THROUGH */
463ee0b2 1348 case OP_RV2GV:
11343788 1349 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1350 break;
8990e307 1351
463ee0b2
LW		 1352 case OP_PADAV:
1353 case OP_PADHV:
aeea060c 1354 o->op_flags |= OPf_REF;
79072805 1355 break;
aeea060c 1356
8990e307 1357 case OP_SCALAR:
79072805 1358 case OP_NULL:
11343788 1359 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1360 break;
11343788 1361 ref(cBINOPo->op_first, type);
79072805
LW		 1362 break;
1363 case OP_AELEM:
1364 case OP_HELEM:
11343788 1365 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1366 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1367 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1368 : type == OP_RV2HV ? OPpDEREF_HV
1369 : OPpDEREF_SV);
11343788 1370 o->op_flags |= OPf_MOD;
8990e307 1371 }
79072805
LW		 1372 break;
1373
463ee0b2 1374 case OP_SCOPE:
79072805
LW		 1375 case OP_LEAVE:
1376 case OP_ENTER:
8990e307 1377 case OP_LIST:
11343788 1378 if (!(o->op_flags & OPf_KIDS))
79072805 1379 break;
11343788 1380 ref(cLISTOPo->op_last, type);
79072805 1381 break;
a0d0e21e
LW		 1382 default:
1383 break;
79072805 1384 }
11343788 1385 return scalar(o);
8990e307 1386
79072805
LW		 1387}
1388
1389OP *
8ac85365 1390my(OP *o)
93a17b20
LW		 1391{
1392 OP *kid;
93a17b20
LW		 1393 I32 type;
1394
11343788
MB		 1395 if (!o || error_count)
1396 return o;
93a17b20 1397
11343788 1398 type = o->op_type;
93a17b20 1399 if (type == OP_LIST) {
11343788 1400 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
93a17b20 1401 my(kid);
dab48698 1402 } else if (type == OP_UNDEF) {
7766148a 1403 return o;
dab48698 1404 } else if (type != OP_PADSV &&
93a17b20
LW		 1405 type != OP_PADAV &&
1406 type != OP_PADHV &&
1407 type != OP_PUSHMARK)
1408 {
5dc0d613 1409 yyerror(form("Can't declare %s in my", op_desc[o->op_type]));
11343788 1410 return o;
93a17b20 1411 }
11343788
MB		 1412 o->op_flags |= OPf_MOD;
1413 o->op_private |= OPpLVAL_INTRO;
1414 return o;
93a17b20
LW		 1415}
1416
1417OP *
8ac85365 1418sawparens(OP *o)
79072805
LW		 1419{
1420 if (o)
1421 o->op_flags |= OPf_PARENS;
1422 return o;
1423}
1424
1425OP *
8ac85365 1426bind_match(I32 type, OP *left, OP *right)
79072805 1427{
11343788 1428 OP *o;
79072805 1429
2ae324a7 1430 if (dowarn &&
1431 (left->op_type == OP_RV2AV ||
1432 left->op_type == OP_RV2HV ||
1433 left->op_type == OP_PADAV ||
1434 left->op_type == OP_PADHV)) {
1435 char *desc = op_desc[(right->op_type == OP_SUBST ||
1436 right->op_type == OP_TRANS)
1437 ? right->op_type : OP_MATCH];
1438 char *sample = ((left->op_type == OP_RV2AV ||
1439 left->op_type == OP_PADAV)
1440 ? "@array" : "%hash");
1441 warn("Applying %s to %s will act on scalar(%s)", desc, sample, sample);
1442 }
1443
79072805
LW		 1444 if (right->op_type == OP_MATCH ||
1445 right->op_type == OP_SUBST ||
1446 right->op_type == OP_TRANS) {
1447 right->op_flags |= OPf_STACKED;
1448 if (right->op_type != OP_MATCH)
463ee0b2 1449 left = mod(left, right->op_type);
79072805 1450 if (right->op_type == OP_TRANS)
11343788 1451 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1452 else
11343788 1453 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1454 if (type == OP_NOT)
11343788
MB		 1455 return newUNOP(OP_NOT, 0, scalar(o));
1456 return o;
79072805
LW		 1457 }
1458 else
1459 return bind_match(type, left,
1460 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1461}
1462
1463OP *
8ac85365 1464invert(OP *o)
79072805 1465{
11343788
MB		 1466 if (!o)
1467 return o;
79072805 1468 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1469 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1470}
1471
1472OP *
8ac85365 1473scope(OP *o)
79072805
LW		 1474{
1475 if (o) {
84902520 1476 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || tainting) {
463ee0b2
LW		 1477 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1478 o->op_type = OP_LEAVE;
1479 o->op_ppaddr = ppaddr[OP_LEAVE];
1480 }
1481 else {
1482 if (o->op_type == OP_LINESEQ) {
1483 OP *kid;
1484 o->op_type = OP_SCOPE;
1485 o->op_ppaddr = ppaddr[OP_SCOPE];
1486 kid = ((LISTOP*)o)->op_first;
748a9306
LW		 1487 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
1488 SvREFCNT_dec(((COP*)kid)->cop_filegv);
8990e307 1489 null(kid);
748a9306 1490 }
463ee0b2
LW		 1491 }
1492 else
748a9306 1493 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1494 }
79072805
LW		 1495 }
1496 return o;
1497}
1498
a0d0e21e 1499int
8ac85365 1500block_start(int full)
79072805 1501{
11343788 1502 dTHR;
a0d0e21e 1503 int retval = savestack_ix;
55497cff 1504 SAVEI32(comppad_name_floor);
1505 if (full) {
93965878 1506 if ((comppad_name_fill = AvFILLp(comppad_name)) > 0)
55497cff 1507 comppad_name_floor = comppad_name_fill;
1508 else
1509 comppad_name_floor = 0;
1510 }
1511 SAVEI32(min_intro_pending);
1512 SAVEI32(max_intro_pending);
a0d0e21e 1513 min_intro_pending = 0;
55497cff 1514 SAVEI32(comppad_name_fill);
1515 SAVEI32(padix_floor);
a0d0e21e
LW		 1516 padix_floor = padix;
1517 pad_reset_pending = FALSE;
55497cff 1518 SAVEI32(hints);
a0d0e21e
LW		 1519 hints &= ~HINT_BLOCK_SCOPE;
1520 return retval;
1521}
1522
1523OP*
8ac85365 1524block_end(I32 floor, OP *seq)
a0d0e21e 1525{
11343788 1526 dTHR;
a0d0e21e
LW		 1527 int needblockscope = hints & HINT_BLOCK_SCOPE;
1528 OP* retval = scalarseq(seq);
a0d0e21e
LW		 1529 LEAVE_SCOPE(floor);
1530 pad_reset_pending = FALSE;
1531 if (needblockscope)
1532 hints |= HINT_BLOCK_SCOPE; /* propagate out */
1533 pad_leavemy(comppad_name_fill);
bbce6d69 1534 cop_seqmax++;
a0d0e21e
LW		 1535 return retval;
1536}
1537
54b9620d
MB		 1538static OP *
1539newDEFSVOP(void)
1540{
1541#ifdef USE_THREADS
1542 OP *o = newOP(OP_THREADSV, 0);
1543 o->op_targ = find_threadsv("_");
1544 return o;
1545#else
1546 return newSVREF(newGVOP(OP_GV, 0, defgv));
1547#endif /* USE_THREADS */
1548}
1549
a0d0e21e 1550void
8ac85365 1551newPROG(OP *o)
a0d0e21e 1552{
11343788 1553 dTHR;
a0d0e21e 1554 if (in_eval) {
5dc0d613 1555 eval_root = newUNOP(OP_LEAVEEVAL, ((in_eval & 4) ? OPf_SPECIAL : 0), o);
a0d0e21e
LW		 1556 eval_start = linklist(eval_root);
1557 eval_root->op_next = 0;
1558 peep(eval_start);
1559 }
1560 else {
5dc0d613 1561 if (!o)
a0d0e21e 1562 return;
11343788 1563 main_root = scope(sawparens(scalarvoid(o)));
a0d0e21e
LW		 1564 curcop = &compiling;
1565 main_start = LINKLIST(main_root);
1566 main_root->op_next = 0;
1567 peep(main_start);
748a9306 1568 compcv = 0;
3841441e 1569
4fdae800 1570 /* Register with debugger */
84902520 1571 if (PERLDB_INTER) {
3841441e 1572 CV *cv = perl_get_cv("DB::postponed", FALSE);
3841441e
CS		 1573 if (cv) {
1574 dSP;
1575 PUSHMARK(sp);
1576 XPUSHs((SV*)compiling.cop_filegv);
1577 PUTBACK;
1578 perl_call_sv((SV*)cv, G_DISCARD);
1579 }
1580 }
79072805 1581 }
79072805
LW		 1582}
1583
1584OP *
8ac85365 1585localize(OP *o, I32 lex)
79072805
LW		 1586{
1587 if (o->op_flags & OPf_PARENS)
1588 list(o);
8990e307 1589 else {
8990e307
LW		 1590 if (dowarn && bufptr > oldbufptr && bufptr[-1] == ',') {
1591 char *s;
1592 for (s = bufptr; *s && (isALNUM(*s) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1593 if (*s == ';' || *s == '=')
8990e307
LW		 1594 warn("Parens missing around \"%s\" list", lex ? "my" : "local");
1595 }
1596 }
93a17b20 1597 in_my = FALSE;
c750a3ec 1598 in_my_stash = Nullhv;
93a17b20
LW		 1599 if (lex)
1600 return my(o);
1601 else
463ee0b2 1602 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 1603}
1604
1605OP *
8ac85365 1606jmaybe(OP *o)
79072805
LW		 1607{
1608 if (o->op_type == OP_LIST) {
554b3eca
MB		 1609 OP *o2;
1610#ifdef USE_THREADS
2faa37cc 1611 o2 = newOP(OP_THREADSV, 0);
54b9620d 1612 o2->op_targ = find_threadsv(";");
554b3eca
MB		 1613#else
1614 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
1615#endif /* USE_THREADS */
1616 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 1617 }
1618 return o;
1619}
1620
1621OP *
8ac85365 1622fold_constants(register OP *o)
79072805 1623{
11343788 1624 dTHR;
79072805
LW		 1625 register OP *curop;
1626 I32 type = o->op_type;
748a9306 1627 SV *sv;
79072805
LW		 1628
1629 if (opargs[type] & OA_RETSCALAR)
1630 scalar(o);
1631 if (opargs[type] & OA_TARGET)
ed6116ce 1632 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1633
85e6fe83 1634 if ((opargs[type] & OA_OTHERINT) && (hints & HINT_INTEGER))
a0d0e21e 1635 o->op_ppaddr = ppaddr[type = ++(o->op_type)];
85e6fe83 1636
79072805
LW		 1637 if (!(opargs[type] & OA_FOLDCONST))
1638 goto nope;
1639
de939608
CS		 1640 switch (type) {
1641 case OP_SPRINTF:
1642 case OP_UCFIRST:
1643 case OP_LCFIRST:
1644 case OP_UC:
1645 case OP_LC:
69dcf70c
MB		 1646 case OP_SLT:
1647 case OP_SGT:
1648 case OP_SLE:
1649 case OP_SGE:
1650 case OP_SCMP:
1651
de939608
CS		 1652 if (o->op_private & OPpLOCALE)
1653 goto nope;
1654 }
1655
a0d0e21e
LW		 1656 if (error_count)
1657 goto nope; /* Don't try to run w/ errors */
1658
79072805 1659 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
93a17b20
LW		 1660 if (curop->op_type != OP_CONST &&
1661 curop->op_type != OP_LIST &&
1662 curop->op_type != OP_SCALAR &&
a0d0e21e 1663 curop->op_type != OP_NULL &&
93a17b20 1664 curop->op_type != OP_PUSHMARK) {
79072805
LW		 1665 goto nope;
1666 }
1667 }
1668
1669 curop = LINKLIST(o);
1670 o->op_next = 0;
1671 op = curop;
8da795c6 1672 runops();
748a9306
LW		 1673 sv = *(stack_sp--);
1674 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 1675 pad_swipe(o->op_targ);
748a9306
LW		 1676 else if (SvTEMP(sv)) { /* grab mortal temp? */
1677 (void)SvREFCNT_inc(sv);
1678 SvTEMP_off(sv);
85e6fe83 1679 }
79072805
LW		 1680 op_free(o);
1681 if (type == OP_RV2GV)
b1cb66bf 1682 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306
LW		 1683 else {
1684 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK) {
1685 IV iv = SvIV(sv);
1686 if ((double)iv == SvNV(sv)) { /* can we smush double to int */
1687 SvREFCNT_dec(sv);
1688 sv = newSViv(iv);
1689 }
b1cb66bf 1690 else
1691 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 1692 }
1693 return newSVOP(OP_CONST, 0, sv);
1694 }
aeea060c 1695
79072805
LW		 1696 nope:
1697 if (!(opargs[type] & OA_OTHERINT))
1698 return o;
79072805 1699
85e6fe83 1700 if (!(hints & HINT_INTEGER)) {
a0d0e21e 1701 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 1702 return o;
1703
1704 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
1705 if (curop->op_type == OP_CONST) {
b1cb66bf 1706 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 1707 continue;
1708 return o;
1709 }
1710 if (opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 1711 continue;
1712 return o;
1713 }
a0d0e21e 1714 o->op_ppaddr = ppaddr[++(o->op_type)];
79072805
LW		 1715 }
1716
79072805
LW		 1717 return o;
1718}
1719
1720OP *
8ac85365 1721gen_constant_list(register OP *o)
79072805 1722{
11343788 1723 dTHR;
79072805 1724 register OP *curop;
79072805 1725 I32 oldtmps_floor = tmps_floor;
79072805 1726
a0d0e21e
LW		 1727 list(o);
1728 if (error_count)
1729 return o; /* Don't attempt to run with errors */
1730
1731 op = curop = LINKLIST(o);
1732 o->op_next = 0;
11343788 1733 pp_pushmark(ARGS);
8da795c6 1734 runops();
a0d0e21e 1735 op = curop;
11343788 1736 pp_anonlist(ARGS);
79072805 1737 tmps_floor = oldtmps_floor;
79072805
LW		 1738
1739 o->op_type = OP_RV2AV;
1740 o->op_ppaddr = ppaddr[OP_RV2AV];
79072805 1741 curop = ((UNOP*)o)->op_first;
a0d0e21e 1742 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*stack_sp--));
79072805 1743 op_free(curop);
79072805
LW		 1744 linklist(o);
1745 return list(o);
1746}
1747
1748OP *
8ac85365 1749convert(I32 type, I32 flags, OP *o)
79072805
LW		 1750{
1751 OP *kid;
a0d0e21e 1752 OP *last = 0;
79072805 1753
11343788
MB		 1754 if (!o || o->op_type != OP_LIST)
1755 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 1756 else
5dc0d613 1757 o->op_flags &= ~OPf_WANT;
79072805 1758
8990e307 1759 if (!(opargs[type] & OA_MARK))
11343788 1760 null(cLISTOPo->op_first);
8990e307 1761
11343788
MB		 1762 o->op_type = type;
1763 o->op_ppaddr = ppaddr[type];
1764 o->op_flags |= flags;
79072805 1765
11343788
MB		 1766 o = CHECKOP(type, o);
1767 if (o->op_type != type)
1768 return o;
79072805 1769
11343788 1770 if (cLISTOPo->op_children < 7) {
79072805 1771 /* XXX do we really need to do this if we're done appending?? */
11343788 1772 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805 1773 last = kid;
11343788 1774 cLISTOPo->op_last = last; /* in case check substituted last arg */
79072805
LW		 1775 }
1776
11343788 1777 return fold_constants(o);
79072805
LW		 1778}
1779
1780/* List constructors */
1781
1782OP *
8ac85365 1783append_elem(I32 type, OP *first, OP *last)
79072805
LW		 1784{
1785 if (!first)
1786 return last;
8990e307
LW		 1787
1788 if (!last)
79072805 1789 return first;
8990e307 1790
a0d0e21e
LW		 1791 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
1792 return newLISTOP(type, 0, first, last);
79072805 1793
a0d0e21e
LW		 1794 if (first->op_flags & OPf_KIDS)
1795 ((LISTOP*)first)->op_last->op_sibling = last;
1796 else {
1797 first->op_flags |= OPf_KIDS;
1798 ((LISTOP*)first)->op_first = last;
1799 }
1800 ((LISTOP*)first)->op_last = last;
1801 ((LISTOP*)first)->op_children++;
1802 return first;
79072805
LW		 1803}
1804
1805OP *
8ac85365 1806append_list(I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 1807{
1808 if (!first)
1809 return (OP*)last;
8990e307
LW		 1810
1811 if (!last)
79072805 1812 return (OP*)first;
8990e307
LW		 1813
1814 if (first->op_type != type)
79072805 1815 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 1816
1817 if (last->op_type != type)
79072805
LW		 1818 return append_elem(type, (OP*)first, (OP*)last);
1819
1820 first->op_last->op_sibling = last->op_first;
1821 first->op_last = last->op_last;
1822 first->op_children += last->op_children;
1823 if (first->op_children)
1824 last->op_flags |= OPf_KIDS;
1825
1826 Safefree(last);
1827 return (OP*)first;
1828}
1829
1830OP *
8ac85365 1831prepend_elem(I32 type, OP *first, OP *last)
79072805
LW		 1832{
1833 if (!first)
1834 return last;
8990e307
LW		 1835
1836 if (!last)
79072805 1837 return first;
8990e307
LW		 1838
1839 if (last->op_type == type) {
1840 if (type == OP_LIST) { /* already a PUSHMARK there */
1841 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
1842 ((LISTOP*)last)->op_first->op_sibling = first;
1843 }
1844 else {
1845 if (!(last->op_flags & OPf_KIDS)) {
1846 ((LISTOP*)last)->op_last = first;
1847 last->op_flags |= OPf_KIDS;
1848 }
1849 first->op_sibling = ((LISTOP*)last)->op_first;
1850 ((LISTOP*)last)->op_first = first;
79072805 1851 }
79072805
LW		 1852 ((LISTOP*)last)->op_children++;
1853 return last;
1854 }
1855
1856 return newLISTOP(type, 0, first, last);
1857}
1858
1859/* Constructors */
1860
1861OP *
8ac85365 1862newNULLLIST(void)
79072805 1863{
8990e307
LW		 1864 return newOP(OP_STUB, 0);
1865}
1866
1867OP *
8ac85365 1868force_list(OP *o)
8990e307 1869{
11343788
MB		 1870 if (!o || o->op_type != OP_LIST)
1871 o = newLISTOP(OP_LIST, 0, o, Nullop);
1872 null(o);
1873 return o;
79072805
LW		 1874}
1875
1876OP *
8ac85365 1877newLISTOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 1878{
1879 LISTOP *listop;
1880
1881 Newz(1101, listop, 1, LISTOP);
1882
1883 listop->op_type = type;
1884 listop->op_ppaddr = ppaddr[type];
1885 listop->op_children = (first != 0) + (last != 0);
1886 listop->op_flags = flags;
79072805
LW		 1887
1888 if (!last && first)
1889 last = first;
1890 else if (!first && last)
1891 first = last;
8990e307
LW		 1892 else if (first)
1893 first->op_sibling = last;
79072805
LW		 1894 listop->op_first = first;
1895 listop->op_last = last;
8990e307
LW		 1896 if (type == OP_LIST) {
1897 OP* pushop;
1898 pushop = newOP(OP_PUSHMARK, 0);
1899 pushop->op_sibling = first;
1900 listop->op_first = pushop;
1901 listop->op_flags |= OPf_KIDS;
1902 if (!last)
1903 listop->op_last = pushop;
1904 }
1905 else if (listop->op_children)
1906 listop->op_flags |= OPf_KIDS;
79072805
LW		 1907
1908 return (OP*)listop;
1909}
1910
1911OP *
8ac85365 1912newOP(I32 type, I32 flags)
79072805 1913{
11343788
MB		 1914 OP *o;
1915 Newz(1101, o, 1, OP);
1916 o->op_type = type;
1917 o->op_ppaddr = ppaddr[type];
1918 o->op_flags = flags;
79072805 1919
11343788
MB		 1920 o->op_next = o;
1921 o->op_private = 0 + (flags >> 8);
79072805 1922 if (opargs[type] & OA_RETSCALAR)
11343788 1923 scalar(o);
79072805 1924 if (opargs[type] & OA_TARGET)
11343788
MB		 1925 o->op_targ = pad_alloc(type, SVs_PADTMP);
1926 return CHECKOP(type, o);
79072805
LW		 1927}
1928
1929OP *
8ac85365 1930newUNOP(I32 type, I32 flags, OP *first)
79072805
LW		 1931{
1932 UNOP *unop;
1933
93a17b20 1934 if (!first)
aeea060c 1935 first = newOP(OP_STUB, 0);
8990e307
LW		 1936 if (opargs[type] & OA_MARK)
1937 first = force_list(first);
93a17b20 1938
79072805
LW		 1939 Newz(1101, unop, 1, UNOP);
1940 unop->op_type = type;
1941 unop->op_ppaddr = ppaddr[type];
1942 unop->op_first = first;
1943 unop->op_flags = flags | OPf_KIDS;
c07a80fd 1944 unop->op_private = 1 | (flags >> 8);
c277df42
IZ		 1945#if 1
1946 if(type == OP_STUDY && first->op_type == OP_MATCH) {
1947 first->op_type = OP_PUSHRE;
1948 first->op_ppaddr = ppaddr[OP_PUSHRE];
1949 }
1950#endif
e50aee73 1951 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 1952 if (unop->op_next)
1953 return (OP*)unop;
1954
a0d0e21e 1955 return fold_constants((OP *) unop);
79072805
LW		 1956}
1957
1958OP *
8ac85365 1959newBINOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 1960{
1961 BINOP *binop;
1962 Newz(1101, binop, 1, BINOP);
1963
1964 if (!first)
1965 first = newOP(OP_NULL, 0);
1966
1967 binop->op_type = type;
1968 binop->op_ppaddr = ppaddr[type];
1969 binop->op_first = first;
1970 binop->op_flags = flags | OPf_KIDS;
1971 if (!last) {
1972 last = first;
c07a80fd 1973 binop->op_private = 1 | (flags >> 8);
79072805
LW		 1974 }
1975 else {
c07a80fd 1976 binop->op_private = 2 | (flags >> 8);
79072805
LW		 1977 first->op_sibling = last;
1978 }
1979
e50aee73 1980 binop = (BINOP*)CHECKOP(type, binop);
79072805
LW		 1981 if (binop->op_next)
1982 return (OP*)binop;
1983
1984 binop->op_last = last = binop->op_first->op_sibling;
1985
a0d0e21e 1986 return fold_constants((OP *)binop);
79072805
LW		 1987}
1988
1989OP *
8ac85365 1990pmtrans(OP *o, OP *expr, OP *repl)
79072805 1991{
79072805
LW		 1992 SV *tstr = ((SVOP*)expr)->op_sv;
1993 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 1994 STRLEN tlen;
1995 STRLEN rlen;
ec49126f 1996 register U8 *t = (U8*)SvPV(tstr, tlen);
1997 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 1998 register I32 i;
1999 register I32 j;
8ac85365 2000 I32 Delete;
79072805 2001 I32 complement;
5d06d08e 2002 I32 squash;
79072805
LW		 2003 register short *tbl;
2004
11343788
MB		 2005 tbl = (short*)cPVOPo->op_pv;
2006 complement = o->op_private & OPpTRANS_COMPLEMENT;
8ac85365 2007 Delete = o->op_private & OPpTRANS_DELETE;
5d06d08e 2008 squash = o->op_private & OPpTRANS_SQUASH;
79072805
LW		 2009
2010 if (complement) {
2011 Zero(tbl, 256, short);
2012 for (i = 0; i < tlen; i++)
ec49126f 2013 tbl[t[i]] = -1;
79072805
LW		 2014 for (i = 0, j = 0; i < 256; i++) {
2015 if (!tbl[i]) {
2016 if (j >= rlen) {
8ac85365 2017 if (Delete)
79072805
LW		 2018 tbl[i] = -2;
2019 else if (rlen)
ec49126f 2020 tbl[i] = r[j-1];
79072805
LW		 2021 else
2022 tbl[i] = i;
2023 }
2024 else
ec49126f 2025 tbl[i] = r[j++];
79072805
LW		 2026 }
2027 }
2028 }
2029 else {
8ac85365 2030 if (!rlen && !Delete) {
79072805 2031 r = t; rlen = tlen;
5d06d08e
MB		 2032 if (!squash)
2033 o->op_private |= OPpTRANS_COUNTONLY;
79072805
LW		 2034 }
2035 for (i = 0; i < 256; i++)
2036 tbl[i] = -1;
2037 for (i = 0, j = 0; i < tlen; i++,j++) {
2038 if (j >= rlen) {
8ac85365 2039 if (Delete) {
ec49126f 2040 if (tbl[t[i]] == -1)
2041 tbl[t[i]] = -2;
79072805
LW		 2042 continue;
2043 }
2044 --j;
2045 }
ec49126f 2046 if (tbl[t[i]] == -1)
2047 tbl[t[i]] = r[j];
79072805
LW		 2048 }
2049 }
2050 op_free(expr);
2051 op_free(repl);
2052
11343788 2053 return o;
79072805
LW		 2054}
2055
2056OP *
8ac85365 2057newPMOP(I32 type, I32 flags)
79072805 2058{
11343788 2059 dTHR;
79072805
LW		 2060 PMOP *pmop;
2061
2062 Newz(1101, pmop, 1, PMOP);
2063 pmop->op_type = type;
2064 pmop->op_ppaddr = ppaddr[type];
2065 pmop->op_flags = flags;
c07a80fd 2066 pmop->op_private = 0 | (flags >> 8);
79072805 2067
36477c24 2068 if (hints & HINT_LOCALE)
2069 pmop->op_pmpermflags = (pmop->op_pmflags |= PMf_LOCALE);
2070
79072805 2071 /* link into pm list */
a0d0e21e 2072 if (type != OP_TRANS && curstash) {
79072805
LW		 2073 pmop->op_pmnext = HvPMROOT(curstash);
2074 HvPMROOT(curstash) = pmop;
2075 }
2076
2077 return (OP*)pmop;
2078}
2079
2080OP *
8ac85365 2081pmruntime(OP *o, OP *expr, OP *repl)
79072805
LW		 2082{
2083 PMOP *pm;
2084 LOGOP *rcop;
2085
11343788
MB		 2086 if (o->op_type == OP_TRANS)
2087 return pmtrans(o, expr, repl);
79072805 2088
3e3baf6d 2089 hints |= HINT_BLOCK_SCOPE;
11343788 2090 pm = (PMOP*)o;
79072805
LW		 2091
2092 if (expr->op_type == OP_CONST) {
463ee0b2 2093 STRLEN plen;
79072805 2094 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2095 char *p = SvPV(pat, plen);
11343788 2096 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2097 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2098 p = SvPV(pat, plen);
79072805
LW		 2099 pm->op_pmflags |= PMf_SKIPWHITE;
2100 }
e50aee73 2101 pm->op_pmregexp = pregcomp(p, p + plen, pm);
aeea060c 2102 if (strEQ("\\s+", pm->op_pmregexp->precomp))
85e6fe83 2103 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2104 op_free(expr);
2105 }
2106 else {
463ee0b2
LW		 2107 if (pm->op_pmflags & PMf_KEEP)
2108 expr = newUNOP(OP_REGCMAYBE,0,expr);
2109
79072805
LW		 2110 Newz(1101, rcop, 1, LOGOP);
2111 rcop->op_type = OP_REGCOMP;
2112 rcop->op_ppaddr = ppaddr[OP_REGCOMP];
2113 rcop->op_first = scalar(expr);
2114 rcop->op_flags |= OPf_KIDS;
2115 rcop->op_private = 1;
11343788 2116 rcop->op_other = o;
79072805
LW		 2117
2118 /* establish postfix order */
463ee0b2
LW		 2119 if (pm->op_pmflags & PMf_KEEP) {
2120 LINKLIST(expr);
2121 rcop->op_next = expr;
2122 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2123 }
2124 else {
2125 rcop->op_next = LINKLIST(expr);
2126 expr->op_next = (OP*)rcop;
2127 }
79072805 2128
11343788 2129 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2130 }
2131
2132 if (repl) {
748a9306
LW		 2133 OP *curop;
2134 if (pm->op_pmflags & PMf_EVAL)
2135 curop = 0;
554b3eca 2136#ifdef USE_THREADS
2faa37cc 2137 else if (repl->op_type == OP_THREADSV
554b3eca 2138 && strchr("&`'123456789+",
54b9620d 2139 threadsv_names[repl->op_targ]))
554b3eca
MB		 2140 {
2141 curop = 0;
2142 }
2143#endif /* USE_THREADS */
748a9306
LW		 2144 else if (repl->op_type == OP_CONST)
2145 curop = repl;
79072805 2146 else {
79072805
LW		 2147 OP *lastop = 0;
2148 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
2149 if (opargs[curop->op_type] & OA_DANGEROUS) {
554b3eca 2150#ifdef USE_THREADS
2faa37cc 2151 if (curop->op_type == OP_THREADSV
554b3eca
MB		 2152 && strchr("&`'123456789+", curop->op_private)) {
2153 break;
2154 }
2155#else
79072805
LW		 2156 if (curop->op_type == OP_GV) {
2157 GV *gv = ((GVOP*)curop)->op_gv;
93a17b20 2158 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 2159 break;
2160 }
554b3eca 2161#endif /* USE_THREADS */
79072805
LW		 2162 else if (curop->op_type == OP_RV2CV)
2163 break;
2164 else if (curop->op_type == OP_RV2SV ||
2165 curop->op_type == OP_RV2AV ||
2166 curop->op_type == OP_RV2HV ||
2167 curop->op_type == OP_RV2GV) {
2168 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2169 break;
2170 }
748a9306
LW		 2171 else if (curop->op_type == OP_PADSV ||
2172 curop->op_type == OP_PADAV ||
2173 curop->op_type == OP_PADHV ||
554b3eca 2174 curop->op_type == OP_PADANY) {
748a9306
LW		 2175 /* is okay */
2176 }
79072805
LW		 2177 else
2178 break;
2179 }
2180 lastop = curop;
2181 }
748a9306
LW		 2182 }
2183 if (curop == repl) {
2184 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2185 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2186 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2187 }
2188 else {
2189 Newz(1101, rcop, 1, LOGOP);
2190 rcop->op_type = OP_SUBSTCONT;
2191 rcop->op_ppaddr = ppaddr[OP_SUBSTCONT];
2192 rcop->op_first = scalar(repl);
2193 rcop->op_flags |= OPf_KIDS;
2194 rcop->op_private = 1;
11343788 2195 rcop->op_other = o;
748a9306
LW		 2196
2197 /* establish postfix order */
2198 rcop->op_next = LINKLIST(repl);
2199 repl->op_next = (OP*)rcop;
2200
2201 pm->op_pmreplroot = scalar((OP*)rcop);
2202 pm->op_pmreplstart = LINKLIST(rcop);
2203 rcop->op_next = 0;
79072805
LW		 2204 }
2205 }
2206
2207 return (OP*)pm;
2208}
2209
2210OP *
8ac85365 2211newSVOP(I32 type, I32 flags, SV *sv)
79072805
LW		 2212{
2213 SVOP *svop;
2214 Newz(1101, svop, 1, SVOP);
2215 svop->op_type = type;
2216 svop->op_ppaddr = ppaddr[type];
2217 svop->op_sv = sv;
2218 svop->op_next = (OP*)svop;
2219 svop->op_flags = flags;
2220 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2221 scalar((OP*)svop);
79072805 2222 if (opargs[type] & OA_TARGET)
ed6116ce 2223 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2224 return CHECKOP(type, svop);
79072805
LW		 2225}
2226
2227OP *
8ac85365 2228newGVOP(I32 type, I32 flags, GV *gv)
79072805 2229{
11343788 2230 dTHR;
79072805
LW		 2231 GVOP *gvop;
2232 Newz(1101, gvop, 1, GVOP);
2233 gvop->op_type = type;
2234 gvop->op_ppaddr = ppaddr[type];
8990e307 2235 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2236 gvop->op_next = (OP*)gvop;
2237 gvop->op_flags = flags;
2238 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2239 scalar((OP*)gvop);
79072805 2240 if (opargs[type] & OA_TARGET)
ed6116ce 2241 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2242 return CHECKOP(type, gvop);
79072805
LW		 2243}
2244
2245OP *
8ac85365 2246newPVOP(I32 type, I32 flags, char *pv)
79072805
LW		 2247{
2248 PVOP *pvop;
2249 Newz(1101, pvop, 1, PVOP);
2250 pvop->op_type = type;
2251 pvop->op_ppaddr = ppaddr[type];
2252 pvop->op_pv = pv;
2253 pvop->op_next = (OP*)pvop;
2254 pvop->op_flags = flags;
2255 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2256 scalar((OP*)pvop);
79072805 2257 if (opargs[type] & OA_TARGET)
ed6116ce 2258 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2259 return CHECKOP(type, pvop);
79072805
LW		 2260}
2261
79072805 2262void
8ac85365 2263package(OP *o)
79072805 2264{
11343788 2265 dTHR;
93a17b20 2266 SV *sv;
79072805
LW		 2267
2268 save_hptr(&curstash);
2269 save_item(curstname);
11343788 2270 if (o) {
463ee0b2
LW		 2271 STRLEN len;
2272 char *name;
11343788 2273 sv = cSVOPo->op_sv;
463ee0b2 2274 name = SvPV(sv, len);
b1cb66bf 2275 curstash = gv_stashpvn(name,len,TRUE);
463ee0b2 2276 sv_setpvn(curstname, name, len);
11343788 2277 op_free(o);
93a17b20
LW		 2278 }
2279 else {
2280 sv_setpv(curstname,"<none>");
2281 curstash = Nullhv;
2282 }
79072805 2283 copline = NOLINE;
8990e307 2284 expect = XSTATE;
79072805
LW		 2285}
2286
85e6fe83 2287void
8ac85365 2288utilize(int aver, I32 floor, OP *version, OP *id, OP *arg)
85e6fe83 2289{
a0d0e21e
LW		 2290 OP *pack;
2291 OP *meth;
2292 OP *rqop;
2293 OP *imop;
b1cb66bf 2294 OP *veop;
85e6fe83 2295
a0d0e21e
LW		 2296 if (id->op_type != OP_CONST)
2297 croak("Module name must be constant");
85e6fe83 2298
b1cb66bf 2299 veop = Nullop;
2300
2301 if(version != Nullop) {
2302 SV *vesv = ((SVOP*)version)->op_sv;
2303
2304 if (arg == Nullop && !SvNIOK(vesv)) {
2305 arg = version;
2306 }
2307 else {
2308 OP *pack;
2309 OP *meth;
2310
2311 if (version->op_type != OP_CONST || !SvNIOK(vesv))
2312 croak("Version number must be constant number");
2313
2314 /* Make copy of id so we don't free it twice */
2315 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2316
2317 /* Fake up a method call to VERSION */
2318 meth = newSVOP(OP_CONST, 0, newSVpv("VERSION", 7));
2319 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2320 append_elem(OP_LIST,
2321 prepend_elem(OP_LIST, pack, list(version)),
2322 newUNOP(OP_METHOD, 0, meth)));
2323 }
2324 }
aeea060c 2325
a0d0e21e 2326 /* Fake up an import/unimport */
4633a7c4
LW		 2327 if (arg && arg->op_type == OP_STUB)
2328 imop = arg; /* no import on explicit () */
b1cb66bf 2329 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2330 imop = Nullop; /* use 5.0; */
2331 }
4633a7c4
LW		 2332 else {
2333 /* Make copy of id so we don't free it twice */
2334 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4
LW		 2335 meth = newSVOP(OP_CONST, 0,
2336 aver
2337 ? newSVpv("import", 6)
2338 : newSVpv("unimport", 8)
2339 );
2340 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2341 append_elem(OP_LIST,
2342 prepend_elem(OP_LIST, pack, list(arg)),
2343 newUNOP(OP_METHOD, 0, meth)));
4633a7c4
LW		 2344 }
2345
2346 /* Fake up a require */
2347 rqop = newUNOP(OP_REQUIRE, 0, id);
a0d0e21e
LW		 2348
2349 /* Fake up the BEGIN {}, which does its thing immediately. */
c07a80fd 2350 newSUB(floor,
a0d0e21e 2351 newSVOP(OP_CONST, 0, newSVpv("BEGIN", 5)),
4633a7c4 2352 Nullop,
a0d0e21e 2353 append_elem(OP_LINESEQ,
b1cb66bf 2354 append_elem(OP_LINESEQ,
2355 newSTATEOP(0, Nullch, rqop),
2356 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2357 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2358
85e6fe83
LW		 2359 copline = NOLINE;
2360 expect = XSTATE;
2361}
2362
79072805 2363OP *
8ac85365 2364newSLICEOP(I32 flags, OP *subscript, OP *listval)
79072805
LW		 2365{
2366 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 2367 list(force_list(subscript)),
2368 list(force_list(listval)) );
79072805
LW		 2369}
2370
2371static I32
8ac85365 2372list_assignment(register OP *o)
79072805 2373{
11343788 2374 if (!o)
79072805
LW		 2375 return TRUE;
2376
11343788
MB		 2377 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
2378 o = cUNOPo->op_first;
79072805 2379
11343788
MB		 2380 if (o->op_type == OP_COND_EXPR) {
2381 I32 t = list_assignment(cCONDOPo->op_first->op_sibling);
2382 I32 f = list_assignment(cCONDOPo->op_first->op_sibling->op_sibling);
79072805
LW		 2383
2384 if (t && f)
2385 return TRUE;
2386 if (t || f)
2387 yyerror("Assignment to both a list and a scalar");
2388 return FALSE;
2389 }
2390
11343788
MB		 2391 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
2392 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
2393 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 2394 return TRUE;
2395
11343788 2396 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 2397 return TRUE;
2398
11343788 2399 if (o->op_type == OP_RV2SV)
79072805
LW		 2400 return FALSE;
2401
2402 return FALSE;
2403}
2404
2405OP *
8ac85365 2406newASSIGNOP(I32 flags, OP *left, I32 optype, OP *right)
79072805 2407{
11343788 2408 OP *o;
79072805 2409
a0d0e21e
LW		 2410 if (optype) {
2411 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
2412 return newLOGOP(optype, 0,
2413 mod(scalar(left), optype),
2414 newUNOP(OP_SASSIGN, 0, scalar(right)));
2415 }
2416 else {
2417 return newBINOP(optype, OPf_STACKED,
2418 mod(scalar(left), optype), scalar(right));
2419 }
2420 }
2421
79072805 2422 if (list_assignment(left)) {
463ee0b2 2423 modcount = 0;
748a9306 2424 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 2425 left = mod(left, OP_AASSIGN);
748a9306
LW		 2426 if (eval_start)
2427 eval_start = 0;
2428 else {
a0d0e21e
LW		 2429 op_free(left);
2430 op_free(right);
2431 return Nullop;
2432 }
11343788 2433 o = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 2434 list(force_list(right)),
2435 list(force_list(left)) );
11343788 2436 o->op_private = 0 | (flags >> 8);
a0d0e21e 2437 if (!(left->op_private & OPpLVAL_INTRO)) {
748a9306 2438 static int generation = 100;
79072805 2439 OP *curop;
11343788 2440 OP *lastop = o;
79072805 2441 generation++;
11343788 2442 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
79072805
LW		 2443 if (opargs[curop->op_type] & OA_DANGEROUS) {
2444 if (curop->op_type == OP_GV) {
2445 GV *gv = ((GVOP*)curop)->op_gv;
2446 if (gv == defgv || SvCUR(gv) == generation)
2447 break;
2448 SvCUR(gv) = generation;
2449 }
748a9306
LW		 2450 else if (curop->op_type == OP_PADSV ||
2451 curop->op_type == OP_PADAV ||
2452 curop->op_type == OP_PADHV ||
2453 curop->op_type == OP_PADANY) {
2454 SV **svp = AvARRAY(comppad_name);
8e07c86e 2455 SV *sv = svp[curop->op_targ];
748a9306
LW		 2456 if (SvCUR(sv) == generation)
2457 break;
2458 SvCUR(sv) = generation; /* (SvCUR not used any more) */
2459 }
79072805
LW		 2460 else if (curop->op_type == OP_RV2CV)
2461 break;
2462 else if (curop->op_type == OP_RV2SV ||
2463 curop->op_type == OP_RV2AV ||
2464 curop->op_type == OP_RV2HV ||
2465 curop->op_type == OP_RV2GV) {
2466 if (lastop->op_type != OP_GV) /* funny deref? */
2467 break;
2468 }
2469 else
2470 break;
2471 }
2472 lastop = curop;
2473 }
11343788
MB		 2474 if (curop != o)
2475 o->op_private = OPpASSIGN_COMMON;
79072805 2476 }
c07a80fd 2477 if (right && right->op_type == OP_SPLIT) {
2478 OP* tmpop;
2479 if ((tmpop = ((LISTOP*)right)->op_first) &&
2480 tmpop->op_type == OP_PUSHRE)
2481 {
2482 PMOP *pm = (PMOP*)tmpop;
2483 if (left->op_type == OP_RV2AV &&
2484 !(left->op_private & OPpLVAL_INTRO) &&
11343788 2485 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 2486 {
2487 tmpop = ((UNOP*)left)->op_first;
2488 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
2489 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
2490 pm->op_pmflags |= PMf_ONCE;
11343788 2491 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 2492 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
2493 tmpop->op_sibling = Nullop; /* don't free split */
2494 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 2495 op_free(o); /* blow off assign */
54310121 2496 right->op_flags &= ~OPf_WANT;
a5f75d66 2497 /* "I don't know and I don't care." */
c07a80fd 2498 return right;
2499 }
2500 }
2501 else {
2502 if (modcount < 10000 &&
2503 ((LISTOP*)right)->op_last->op_type == OP_CONST)
2504 {
2505 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
2506 if (SvIVX(sv) == 0)
2507 sv_setiv(sv, modcount+1);
2508 }
2509 }
2510 }
2511 }
11343788 2512 return o;
79072805
LW		 2513 }
2514 if (!right)
2515 right = newOP(OP_UNDEF, 0);
2516 if (right->op_type == OP_READLINE) {
2517 right->op_flags |= OPf_STACKED;
463ee0b2 2518 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 2519 }
a0d0e21e 2520 else {
748a9306 2521 eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 2522 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 2523 scalar(right), mod(scalar(left), OP_SASSIGN) );
748a9306
LW		 2524 if (eval_start)
2525 eval_start = 0;
2526 else {
11343788 2527 op_free(o);
a0d0e21e
LW		 2528 return Nullop;
2529 }
2530 }
11343788 2531 return o;
79072805
LW		 2532}
2533
2534OP *
8ac85365 2535newSTATEOP(I32 flags, char *label, OP *o)
79072805 2536{
11343788 2537 dTHR;
bbce6d69 2538 U32 seq = intro_my();
79072805
LW		 2539 register COP *cop;
2540
2541 Newz(1101, cop, 1, COP);
84902520 2542 if (PERLDB_LINE && curcop->cop_line && curstash != debstash) {
8990e307
LW		 2543 cop->op_type = OP_DBSTATE;
2544 cop->op_ppaddr = ppaddr[ OP_DBSTATE ];
2545 }
2546 else {
2547 cop->op_type = OP_NEXTSTATE;
2548 cop->op_ppaddr = ppaddr[ OP_NEXTSTATE ];
2549 }
79072805 2550 cop->op_flags = flags;
c07a80fd 2551 cop->op_private = 0 | (flags >> 8);
ff0cee69 2552#ifdef NATIVE_HINTS
2553 cop->op_private |= NATIVE_HINTS;
2554#endif
79072805
LW		 2555 cop->op_next = (OP*)cop;
2556
463ee0b2
LW		 2557 if (label) {
2558 cop->cop_label = label;
85e6fe83 2559 hints |= HINT_BLOCK_SCOPE;
463ee0b2 2560 }
bbce6d69 2561 cop->cop_seq = seq;
a0d0e21e 2562 cop->cop_arybase = curcop->cop_arybase;
79072805
LW		 2563
2564 if (copline == NOLINE)
2565 cop->cop_line = curcop->cop_line;
2566 else {
2567 cop->cop_line = copline;
2568 copline = NOLINE;
2569 }
44a8e56a 2570 cop->cop_filegv = (GV*)SvREFCNT_inc(curcop->cop_filegv);
79072805
LW		 2571 cop->cop_stash = curstash;
2572
84902520 2573 if (PERLDB_LINE && curstash != debstash) {
93a17b20
LW		 2574 SV **svp = av_fetch(GvAV(curcop->cop_filegv),(I32)cop->cop_line, FALSE);
2575 if (svp && *svp != &sv_undef && !SvIOK(*svp)) {
a0d0e21e 2576 (void)SvIOK_on(*svp);
a5f75d66 2577 SvIVX(*svp) = 1;
93a17b20
LW		 2578 SvSTASH(*svp) = (HV*)cop;
2579 }
2580 }
2581
11343788 2582 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 2583}
2584
bbce6d69 2585/* "Introduce" my variables to visible status. */
2586U32
8ac85365 2587intro_my(void)
bbce6d69 2588{
2589 SV **svp;
2590 SV *sv;
2591 I32 i;
2592
2593 if (! min_intro_pending)
2594 return cop_seqmax;
2595
2596 svp = AvARRAY(comppad_name);
2597 for (i = min_intro_pending; i <= max_intro_pending; i++) {
2598 if ((sv = svp[i]) && sv != &sv_undef && !SvIVX(sv)) {
2599 SvIVX(sv) = 999999999; /* Don't know scope end yet. */
2600 SvNVX(sv) = (double)cop_seqmax;
2601 }
2602 }
2603 min_intro_pending = 0;
2604 comppad_name_fill = max_intro_pending; /* Needn't search higher */
2605 return cop_seqmax++;
2606}
2607
79072805 2608OP *
8ac85365 2609newLOGOP(I32 type, I32 flags, OP *first, OP *other)
79072805 2610{
883ffac3
CS		 2611 return new_logop(type, flags, &first, &other);
2612}
2613
2614static OP *
2615new_logop(I32 type, I32 flags, OP** firstp, OP** otherp)
2616{
11343788 2617 dTHR;
79072805 2618 LOGOP *logop;
11343788 2619 OP *o;
883ffac3
CS		 2620 OP *first = *firstp;
2621 OP *other = *otherp;
79072805 2622
a0d0e21e
LW		 2623 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
2624 return newBINOP(type, flags, scalar(first), scalar(other));
2625
8990e307 2626 scalarboolean(first);
79072805
LW		 2627 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
2628 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
2629 if (type == OP_AND || type == OP_OR) {
2630 if (type == OP_AND)
2631 type = OP_OR;
2632 else
2633 type = OP_AND;
11343788 2634 o = first;
883ffac3 2635 first = *firstp = cUNOPo->op_first;
11343788
MB		 2636 if (o->op_next)
2637 first->op_next = o->op_next;
2638 cUNOPo->op_first = Nullop;
2639 op_free(o);
79072805
LW		 2640 }
2641 }
2642 if (first->op_type == OP_CONST) {
93a17b20 2643 if (dowarn && (first->op_private & OPpCONST_BARE))
c07a80fd 2644 warn("Probable precedence problem on %s", op_desc[type]);
79072805
LW		 2645 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
2646 op_free(first);
883ffac3 2647 *firstp = Nullop;
79072805
LW		 2648 return other;
2649 }
2650 else {
2651 op_free(other);
883ffac3 2652 *otherp = Nullop;
79072805
LW		 2653 return first;
2654 }
2655 }
2656 else if (first->op_type == OP_WANTARRAY) {
2657 if (type == OP_AND)
2658 list(other);
2659 else
2660 scalar(other);
2661 }
a6006777 2662 else if (dowarn && (first->op_flags & OPf_KIDS)) {
2663 OP *k1 = ((UNOP*)first)->op_first;
2664 OP *k2 = k1->op_sibling;
2665 OPCODE warnop = 0;
2666 switch (first->op_type)
2667 {
2668 case OP_NULL:
2669 if (k2 && k2->op_type == OP_READLINE
2670 && (k2->op_flags & OPf_STACKED)
2671 && (k1->op_type == OP_RV2SV || k1->op_type == OP_PADSV))
2672 warnop = k2->op_type;
2673 break;
2674
2675 case OP_SASSIGN:
68dc0745 2676 if (k1->op_type == OP_READDIR
2677 || k1->op_type == OP_GLOB
2678 || k1->op_type == OP_EACH)
a6006777 2679 warnop = k1->op_type;
2680 break;
2681 }
8ebc5c01 2682 if (warnop) {
2683 line_t oldline = curcop->cop_line;
2684 curcop->cop_line = copline;
68dc0745 2685 warn("Value of %s%s can be \"0\"; test with defined()",
2686 op_desc[warnop],
2687 ((warnop == OP_READLINE || warnop == OP_GLOB)
2688 ? " construct" : "() operator"));
2689 curcop->cop_line = oldline;
8ebc5c01 2690 }
a6006777 2691 }
79072805
LW		 2692
2693 if (!other)
2694 return first;
2695
a0d0e21e
LW		 2696 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
2697 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
2698
79072805
LW		 2699 Newz(1101, logop, 1, LOGOP);
2700
2701 logop->op_type = type;
2702 logop->op_ppaddr = ppaddr[type];
2703 logop->op_first = first;
2704 logop->op_flags = flags | OPf_KIDS;
2705 logop->op_other = LINKLIST(other);
c07a80fd 2706 logop->op_private = 1 | (flags >> 8);
79072805
LW		 2707
2708 /* establish postfix order */
2709 logop->op_next = LINKLIST(first);
2710 first->op_next = (OP*)logop;
2711 first->op_sibling = other;
2712
11343788
MB		 2713 o = newUNOP(OP_NULL, 0, (OP*)logop);
2714 other->op_next = o;
79072805 2715
11343788 2716 return o;
79072805
LW		 2717}
2718
2719OP *
8ac85365 2720newCONDOP(I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 2721{
11343788 2722 dTHR;
79072805 2723 CONDOP *condop;
11343788 2724 OP *o;
79072805 2725
b1cb66bf 2726 if (!falseop)
2727 return newLOGOP(OP_AND, 0, first, trueop);
2728 if (!trueop)
2729 return newLOGOP(OP_OR, 0, first, falseop);
79072805 2730
8990e307 2731 scalarboolean(first);
79072805
LW		 2732 if (first->op_type == OP_CONST) {
2733 if (SvTRUE(((SVOP*)first)->op_sv)) {
2734 op_free(first);
b1cb66bf 2735 op_free(falseop);
2736 return trueop;
79072805
LW		 2737 }
2738 else {
2739 op_free(first);
b1cb66bf 2740 op_free(trueop);
2741 return falseop;
79072805
LW		 2742 }
2743 }
2744 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 2745 list(trueop);
2746 scalar(falseop);
79072805
LW		 2747 }
2748 Newz(1101, condop, 1, CONDOP);
2749
2750 condop->op_type = OP_COND_EXPR;
2751 condop->op_ppaddr = ppaddr[OP_COND_EXPR];
2752 condop->op_first = first;
2753 condop->op_flags = flags | OPf_KIDS;
b1cb66bf 2754 condop->op_true = LINKLIST(trueop);
2755 condop->op_false = LINKLIST(falseop);
c07a80fd 2756 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2757
2758 /* establish postfix order */
2759 condop->op_next = LINKLIST(first);
2760 first->op_next = (OP*)condop;
2761
b1cb66bf 2762 first->op_sibling = trueop;
2763 trueop->op_sibling = falseop;
11343788 2764 o = newUNOP(OP_NULL, 0, (OP*)condop);
79072805 2765
5dc0d613
MB		 2766 trueop->op_next = o;
2767 falseop->op_next = o;
79072805 2768
11343788 2769 return o;
79072805
LW		 2770}
2771
2772OP *
8ac85365 2773newRANGE(I32 flags, OP *left, OP *right)
79072805 2774{
b35b2403 2775 dTHR;
79072805
LW		 2776 CONDOP *condop;
2777 OP *flip;
2778 OP *flop;
11343788 2779 OP *o;
79072805
LW		 2780
2781 Newz(1101, condop, 1, CONDOP);
2782
2783 condop->op_type = OP_RANGE;
2784 condop->op_ppaddr = ppaddr[OP_RANGE];
2785 condop->op_first = left;
2786 condop->op_flags = OPf_KIDS;
2787 condop->op_true = LINKLIST(left);
2788 condop->op_false = LINKLIST(right);
c07a80fd 2789 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2790
2791 left->op_sibling = right;
2792
2793 condop->op_next = (OP*)condop;
2794 flip = newUNOP(OP_FLIP, flags, (OP*)condop);
2795 flop = newUNOP(OP_FLOP, 0, flip);
11343788 2796 o = newUNOP(OP_NULL, 0, flop);
79072805
LW		 2797 linklist(flop);
2798
2799 left->op_next = flip;
2800 right->op_next = flop;
2801
ed6116ce 2802 condop->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805 2803 sv_upgrade(PAD_SV(condop->op_targ), SVt_PVNV);
ed6116ce 2804 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 2805 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
2806
2807 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2808 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2809
11343788 2810 flip->op_next = o;
79072805 2811 if (!flip->op_private || !flop->op_private)
11343788 2812 linklist(o); /* blow off optimizer unless constant */
79072805 2813
11343788 2814 return o;
79072805
LW		 2815}
2816
2817OP *
8ac85365 2818newLOOPOP(I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 2819{
11343788 2820 dTHR;
463ee0b2 2821 OP* listop;
11343788 2822 OP* o;
463ee0b2 2823 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 2824 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 2825
463ee0b2
LW		 2826 if (expr) {
2827 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
2828 return block; /* do {} while 0 does once */
fb73857a 2829 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
2830 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 2831 expr = newUNOP(OP_DEFINED, 0,
54b9620d 2832 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
774d564b 2833 }
463ee0b2 2834 }
93a17b20 2835
8990e307 2836 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 2837 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 2838
883ffac3
CS		 2839 if (listop)
2840 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 2841
11343788
MB		 2842 if (once && o != listop)
2843 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 2844
11343788
MB		 2845 if (o == listop)
2846 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 2847
11343788
MB		 2848 o->op_flags |= flags;
2849 o = scope(o);
2850 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
2851 return o;
79072805
LW		 2852}
2853
2854OP *
8ac85365 2855newWHILEOP(I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805 2856{
11343788 2857 dTHR;
79072805
LW		 2858 OP *redo;
2859 OP *next = 0;
2860 OP *listop;
11343788 2861 OP *o;
79072805
LW		 2862 OP *condop;
2863
fb73857a 2864 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
2865 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 2866 expr = newUNOP(OP_DEFINED, 0,
54b9620d 2867 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
748a9306 2868 }
79072805
LW		 2869
2870 if (!block)
2871 block = newOP(OP_NULL, 0);
2872
2873 if (cont)
2874 next = LINKLIST(cont);
fb73857a 2875 if (expr) {
79072805 2876 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
fb73857a 2877 if ((line_t)whileline != NOLINE) {
2878 copline = whileline;
2879 cont = append_elem(OP_LINESEQ, cont,
2880 newSTATEOP(0, Nullch, Nullop));
2881 }
2882 }
79072805 2883
463ee0b2 2884 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 2885 redo = LINKLIST(listop);
2886
2887 if (expr) {
883ffac3
CS		 2888 copline = whileline;
2889 scalar(listop);
2890 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 2891 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 2892 op_free(expr); /* oops, it's a while (0) */
463ee0b2 2893 op_free((OP*)loop);
883ffac3 2894 return Nullop; /* listop already freed by new_logop */
463ee0b2 2895 }
883ffac3
CS		 2896 if (listop)
2897 ((LISTOP*)listop)->op_last->op_next = condop =
2898 (o == listop ? redo : LINKLIST(o));
79072805
LW		 2899 if (!next)
2900 next = condop;
2901 }
2902 else
11343788 2903 o = listop;
79072805
LW		 2904
2905 if (!loop) {
2906 Newz(1101,loop,1,LOOP);
2907 loop->op_type = OP_ENTERLOOP;
2908 loop->op_ppaddr = ppaddr[OP_ENTERLOOP];
2909 loop->op_private = 0;
2910 loop->op_next = (OP*)loop;
2911 }
2912
11343788 2913 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 2914
2915 loop->op_redoop = redo;
11343788 2916 loop->op_lastop = o;
79072805
LW		 2917
2918 if (next)
2919 loop->op_nextop = next;
2920 else
11343788 2921 loop->op_nextop = o;
79072805 2922
11343788
MB		 2923 o->op_flags |= flags;
2924 o->op_private |= (flags >> 8);
2925 return o;
79072805
LW		 2926}
2927
2928OP *
8990e307 2929newFOROP(I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
79072805
LW		 2930{
2931 LOOP *loop;
fb73857a 2932 OP *wop;
85e6fe83 2933 int padoff = 0;
4633a7c4 2934 I32 iterflags = 0;
79072805 2935
79072805 2936 if (sv) {
85e6fe83 2937 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306
LW		 2938 sv->op_type = OP_RV2GV;
2939 sv->op_ppaddr = ppaddr[OP_RV2GV];
79072805 2940 }
85e6fe83
LW		 2941 else if (sv->op_type == OP_PADSV) { /* private variable */
2942 padoff = sv->op_targ;
2943 op_free(sv);
2944 sv = Nullop;
2945 }
54b9620d
MB		 2946 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
2947 padoff = sv->op_targ;
2948 iterflags |= OPf_SPECIAL;
2949 op_free(sv);
2950 sv = Nullop;
2951 }
79072805 2952 else
c07a80fd 2953 croak("Can't use %s for loop variable", op_desc[sv->op_type]);
79072805
LW		 2954 }
2955 else {
54b9620d
MB		 2956#ifdef USE_THREADS
2957 padoff = find_threadsv("_");
2958 iterflags |= OPf_SPECIAL;
2959#else
79072805 2960 sv = newGVOP(OP_GV, 0, defgv);
54b9620d 2961#endif
79072805 2962 }
5f05dabc 2963 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
4633a7c4
LW		 2964 expr = scalar(ref(expr, OP_ITER));
2965 iterflags |= OPf_STACKED;
2966 }
2967 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
a0d0e21e
LW		 2968 append_elem(OP_LIST, mod(force_list(expr), OP_GREPSTART),
2969 scalar(sv))));
85e6fe83
LW		 2970 assert(!loop->op_next);
2971 Renew(loop, 1, LOOP);
2972 loop->op_targ = padoff;
fb73857a 2973 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont);
2974 copline = forline;
2975 return newSTATEOP(0, label, wop);
79072805
LW		 2976}
2977
8990e307 2978OP*
8ac85365 2979newLOOPEX(I32 type, OP *label)
8990e307 2980{
11343788
MB		 2981 dTHR;
2982 OP *o;
8990e307 2983 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 2984 /* "last()" means "last" */
2985 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
2986 o = newOP(type, OPf_SPECIAL);
2987 else {
2988 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
2989 ? SvPVx(((SVOP*)label)->op_sv, na)
2990 : ""));
2991 }
8990e307
LW		 2992 op_free(label);
2993 }
2994 else {
a0d0e21e
LW		 2995 if (label->op_type == OP_ENTERSUB)
2996 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 2997 o = newUNOP(type, OPf_STACKED, label);
8990e307 2998 }
85e6fe83 2999 hints |= HINT_BLOCK_SCOPE;
11343788 3000 return o;
8990e307
LW		 3001}
3002
79072805 3003void
8ac85365 3004cv_undef(CV *cv)
79072805 3005{
11343788
MB		 3006 dTHR;
3007#ifdef USE_THREADS
e858de61
MB		 3008 if (CvMUTEXP(cv)) {
3009 MUTEX_DESTROY(CvMUTEXP(cv));
3010 Safefree(CvMUTEXP(cv));
3011 CvMUTEXP(cv) = 0;
3012 }
11343788
MB		 3013#endif /* USE_THREADS */
3014
a0d0e21e 3015 if (!CvXSUB(cv) && CvROOT(cv)) {
11343788
MB		 3016#ifdef USE_THREADS
3017 if (CvDEPTH(cv) || (CvOWNER(cv) && CvOWNER(cv) != thr))
3018 croak("Can't undef active subroutine");
3019#else
a0d0e21e
LW		 3020 if (CvDEPTH(cv))
3021 croak("Can't undef active subroutine");
11343788 3022#endif /* USE_THREADS */
8990e307 3023 ENTER;
a0d0e21e
LW		 3024
3025 SAVESPTR(curpad);
3026 curpad = 0;
3027
a5f75d66 3028 if (!CvCLONED(cv))
748a9306 3029 op_free(CvROOT(cv));
79072805 3030 CvROOT(cv) = Nullop;
8990e307 3031 LEAVE;
79072805 3032 }
1d5db326 3033 SvPOK_off((SV*)cv); /* forget prototype */
44a8e56a 3034 CvFLAGS(cv) = 0;
8e07c86e
AD		 3035 SvREFCNT_dec(CvGV(cv));
3036 CvGV(cv) = Nullgv;
3037 SvREFCNT_dec(CvOUTSIDE(cv));
3038 CvOUTSIDE(cv) = Nullcv;
3039 if (CvPADLIST(cv)) {
8ebc5c01 3040 /* may be during global destruction */
3041 if (SvREFCNT(CvPADLIST(cv))) {
93965878 3042 I32 i = AvFILLp(CvPADLIST(cv));
8ebc5c01 3043 while (i >= 0) {
3044 SV** svp = av_fetch(CvPADLIST(cv), i--, FALSE);
46fc3d4c 3045 SV* sv = svp ? *svp : Nullsv;
3046 if (!sv)
3047 continue;
3048 if (sv == (SV*)comppad_name)
3049 comppad_name = Nullav;
3050 else if (sv == (SV*)comppad) {
3051 comppad = Nullav;
3052 curpad = Null(SV**);
3053 }
3054 SvREFCNT_dec(sv);
8ebc5c01 3055 }
3056 SvREFCNT_dec((SV*)CvPADLIST(cv));
8e07c86e 3057 }
8e07c86e
AD		 3058 CvPADLIST(cv) = Nullav;
3059 }
79072805
LW		 3060}
3061
5f05dabc 3062#ifdef DEBUG_CLOSURES
3063static void
3064cv_dump(cv)
3065CV* cv;
3066{
3067 CV *outside = CvOUTSIDE(cv);
3068 AV* padlist = CvPADLIST(cv);
4fdae800 3069 AV* pad_name;
3070 AV* pad;
3071 SV** pname;
3072 SV** ppad;
5f05dabc 3073 I32 ix;
3074
fb73857a 3075 PerlIO_printf(Perl_debug_log, "\tCV=0x%lx (%s), OUTSIDE=0x%lx (%s)\n",
ab50184a
CS		 3076 cv,
3077 (CvANON(cv) ? "ANON"
3078 : (cv == main_cv) ? "MAIN"
07055b4c 3079 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3080 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
ab50184a
CS		 3081 outside,
3082 (!outside ? "null"
3083 : CvANON(outside) ? "ANON"
3084 : (outside == main_cv) ? "MAIN"
07055b4c 3085 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3086 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
5f05dabc 3087
4fdae800 3088 if (!padlist)
3089 return;
3090
3091 pad_name = (AV*)*av_fetch(padlist, 0, FALSE);
3092 pad = (AV*)*av_fetch(padlist, 1, FALSE);
3093 pname = AvARRAY(pad_name);
3094 ppad = AvARRAY(pad);
3095
93965878 3096 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
5f05dabc 3097 if (SvPOK(pname[ix]))
fb73857a 3098 PerlIO_printf(Perl_debug_log, "\t%4d. 0x%lx (%s\"%s\" %ld-%ld)\n",
4fdae800 3099 ix, ppad[ix],
3100 SvFAKE(pname[ix]) ? "FAKE " : "",
3101 SvPVX(pname[ix]),
ab50184a
CS		 3102 (long)I_32(SvNVX(pname[ix])),
3103 (long)SvIVX(pname[ix]));
5f05dabc 3104 }
3105}
3106#endif /* DEBUG_CLOSURES */
3107
3108static CV *
8ac85365 3109cv_clone2(CV *proto, CV *outside)
748a9306 3110{
11343788 3111 dTHR;
748a9306
LW		 3112 AV* av;
3113 I32 ix;
3114 AV* protopadlist = CvPADLIST(proto);
3115 AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
3116 AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
5f05dabc 3117 SV** pname = AvARRAY(protopad_name);
3118 SV** ppad = AvARRAY(protopad);
93965878
NIS		 3119 I32 fname = AvFILLp(protopad_name);
3120 I32 fpad = AvFILLp(protopad);
748a9306
LW		 3121 AV* comppadlist;
3122 CV* cv;
3123
07055b4c
CS		 3124 assert(!CvUNIQUE(proto));
3125
748a9306
LW		 3126 ENTER;
3127 SAVESPTR(curpad);
3128 SAVESPTR(comppad);
46fc3d4c 3129 SAVESPTR(comppad_name);
748a9306
LW		 3130 SAVESPTR(compcv);
3131
3132 cv = compcv = (CV*)NEWSV(1104,0);
fa83b5b6 3133 sv_upgrade((SV *)cv, SvTYPE(proto));
a5f75d66 3134 CvCLONED_on(cv);
5f05dabc 3135 if (CvANON(proto))
3136 CvANON_on(cv);
748a9306 3137
11343788 3138#ifdef USE_THREADS
12ca11f6 3139 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3140 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3141 CvOWNER(cv) = 0;
3142#endif /* USE_THREADS */
748a9306 3143 CvFILEGV(cv) = CvFILEGV(proto);
44a8e56a 3144 CvGV(cv) = (GV*)SvREFCNT_inc(CvGV(proto));
748a9306
LW		 3145 CvSTASH(cv) = CvSTASH(proto);
3146 CvROOT(cv) = CvROOT(proto);
3147 CvSTART(cv) = CvSTART(proto);
5f05dabc 3148 if (outside)
3149 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
748a9306 3150
68dc0745 3151 if (SvPOK(proto))
3152 sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto));
3153
46fc3d4c 3154 comppad_name = newAV();
3155 for (ix = fname; ix >= 0; ix--)
3156 av_store(comppad_name, ix, SvREFCNT_inc(pname[ix]));
748a9306
LW		 3157
3158 comppad = newAV();
3159
3160 comppadlist = newAV();
3161 AvREAL_off(comppadlist);
46fc3d4c 3162 av_store(comppadlist, 0, (SV*)comppad_name);
b355b4e0 3163 av_store(comppadlist, 1, (SV*)comppad);
748a9306 3164 CvPADLIST(cv) = comppadlist;
93965878 3165 av_fill(comppad, AvFILLp(protopad));
748a9306
LW		 3166 curpad = AvARRAY(comppad);
3167
3168 av = newAV(); /* will be @_ */
3169 av_extend(av, 0);
3170 av_store(comppad, 0, (SV*)av);
3171 AvFLAGS(av) = AVf_REIFY;
3172
9607fc9c 3173 for (ix = fpad; ix > 0; ix--) {
3174 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3175 if (namesv && namesv != &sv_undef) {
3176 char *name = SvPVX(namesv); /* XXX */
3177 if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */
3178 I32 off = pad_findlex(name, ix, SvIVX(namesv),
5f05dabc 3179 CvOUTSIDE(cv), cxstack_ix);
3180 if (!off)
3181 curpad[ix] = SvREFCNT_inc(ppad[ix]);
3182 else if (off != ix)
748a9306
LW		 3183 croak("panic: cv_clone: %s", name);
3184 }
3185 else { /* our own lexical */
aa689395 3186 SV* sv;
5f05dabc 3187 if (*name == '&') {
3188 /* anon code -- we'll come back for it */
3189 sv = SvREFCNT_inc(ppad[ix]);
3190 }
3191 else if (*name == '@')
3192 sv = (SV*)newAV();
748a9306 3193 else if (*name == '%')
5f05dabc 3194 sv = (SV*)newHV();
748a9306 3195 else
5f05dabc 3196 sv = NEWSV(0,0);
3197 if (!SvPADBUSY(sv))
3198 SvPADMY_on(sv);
3199 curpad[ix] = sv;
748a9306
LW		 3200 }
3201 }
3202 else {
aa689395 3203 SV* sv = NEWSV(0,0);
748a9306 3204 SvPADTMP_on(sv);
5f05dabc 3205 curpad[ix] = sv;
748a9306
LW		 3206 }
3207 }
3208
5f05dabc 3209 /* Now that vars are all in place, clone nested closures. */
3210
9607fc9c 3211 for (ix = fpad; ix > 0; ix--) {
3212 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3213 if (namesv
3214 && namesv != &sv_undef
3215 && !(SvFLAGS(namesv) & SVf_FAKE)
3216 && *SvPVX(namesv) == '&'
5f05dabc 3217 && CvCLONE(ppad[ix]))
3218 {
3219 CV *kid = cv_clone2((CV*)ppad[ix], cv);
3220 SvREFCNT_dec(ppad[ix]);
3221 CvCLONE_on(kid);
3222 SvPADMY_on(kid);
3223 curpad[ix] = (SV*)kid;
748a9306
LW		 3224 }
3225 }
3226
5f05dabc 3227#ifdef DEBUG_CLOSURES
ab50184a
CS		 3228 PerlIO_printf(Perl_debug_log, "Cloned inside:\n");
3229 cv_dump(outside);
3230 PerlIO_printf(Perl_debug_log, " from:\n");
5f05dabc 3231 cv_dump(proto);
ab50184a 3232 PerlIO_printf(Perl_debug_log, " to:\n");
5f05dabc 3233 cv_dump(cv);
3234#endif
3235
748a9306
LW		 3236 LEAVE;
3237 return cv;
3238}
3239
3240CV *
8ac85365 3241cv_clone(CV *proto)
5f05dabc 3242{
3243 return cv_clone2(proto, CvOUTSIDE(proto));
3244}
3245
3fe9a6f1 3246void
8ac85365 3247cv_ckproto(CV *cv, GV *gv, char *p)
3fe9a6f1 3248{
3249 if ((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX(cv)))) {
46fc3d4c 3250 SV* msg = sv_newmortal();
3fe9a6f1 3251 SV* name = Nullsv;
3252
3253 if (gv)
46fc3d4c 3254 gv_efullname3(name = sv_newmortal(), gv, Nullch);
3255 sv_setpv(msg, "Prototype mismatch:");
3256 if (name)
fc36a67e 3257 sv_catpvf(msg, " sub %_", name);
3fe9a6f1 3258 if (SvPOK(cv))
46fc3d4c 3259 sv_catpvf(msg, " (%s)", SvPVX(cv));
3260 sv_catpv(msg, " vs ");
3261 if (p)
3262 sv_catpvf(msg, "(%s)", p);
3263 else
3264 sv_catpv(msg, "none");
fc36a67e 3265 warn("%_", msg);
3fe9a6f1 3266 }
3267}
3268
760ac839 3269SV *
8ac85365 3270cv_const_sv(CV *cv)
760ac839
LW		 3271{
3272 OP *o;
54310121 3273 SV *sv;
aeea060c 3274
54310121 3275 if (!cv || !SvPOK(cv) || SvCUR(cv))
3276 return Nullsv;
760ac839 3277
54310121 3278 sv = Nullsv;
3279 for (o = CvSTART(cv); o; o = o->op_next) {
3280 OPCODE type = o->op_type;
3281
3282 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
3283 continue;
3284 if (type == OP_LEAVESUB || type == OP_RETURN)
3285 break;
3286 if (sv)
3287 return Nullsv;
3288 if (type == OP_CONST)
5dc0d613 3289 sv = cSVOPo->op_sv;
54310121 3290 else if (type == OP_PADSV) {
e858de61
MB		 3291 AV* padav = (AV*)(AvARRAY(CvPADLIST(cv))[1]);
3292 sv = padav ? AvARRAY(padav)[o->op_targ] : Nullsv;
5aabfad6 3293 if (!sv || (!SvREADONLY(sv) && SvREFCNT(sv) > 1))
54310121 3294 return Nullsv;
760ac839 3295 }
54310121 3296 else
3297 return Nullsv;
760ac839 3298 }
5aabfad6 3299 if (sv)
3300 SvREADONLY_on(sv);
760ac839
LW		 3301 return sv;
3302}
3303
748a9306 3304CV *
8ac85365 3305newSUB(I32 floor, OP *o, OP *proto, OP *block)
79072805 3306{
11343788 3307 dTHR;
5dc0d613 3308 char *name = o ? SvPVx(cSVOPo->op_sv, na) : Nullch;
44a8e56a 3309 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
3fe9a6f1 3310 char *ps = proto ? SvPVx(((SVOP*)proto)->op_sv, na) : Nullch;
79072805 3311 register CV *cv;
a0d0e21e 3312 I32 ix;
79072805 3313
11343788 3314 if (o)
5dc0d613 3315 SAVEFREEOP(o);
3fe9a6f1 3316 if (proto)
3317 SAVEFREEOP(proto);
3318
68dc0745 3319 if (!name || GvCVGEN(gv))
3320 cv = Nullcv;
3321 else if (cv = GvCV(gv)) {
3fe9a6f1 3322 cv_ckproto(cv, gv, ps);
68dc0745 3323 /* already defined (or promised)? */
3324 if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3325 SV* const_sv;
aa689395 3326 if (!block) {
3327 /* just a "sub foo;" when &foo is already defined */
3328 SAVEFREESV(compcv);
3329 goto done;
3330 }
7bac28a0 3331 /* ahem, death to those who redefine active sort subs */
3332 if (curstack == sortstack && sortcop == CvSTART(cv))
3333 croak("Can't redefine active sort subroutine %s", name);
68dc0745 3334 const_sv = cv_const_sv(cv);
44a8e56a 3335 if (const_sv || dowarn) {
79072805 3336 line_t oldline = curcop->cop_line;
79072805 3337 curcop->cop_line = copline;
760ac839 3338 warn(const_sv ? "Constant subroutine %s redefined"
68dc0745 3339 : "Subroutine %s redefined", name);
79072805
LW		 3340 curcop->cop_line = oldline;
3341 }
8990e307 3342 SvREFCNT_dec(cv);
68dc0745 3343 cv = Nullcv;
79072805
LW		 3344 }
3345 }
a0d0e21e 3346 if (cv) { /* must reuse cv if autoloaded */
4633a7c4 3347 cv_undef(cv);
44a8e56a 3348 CvFLAGS(cv) = CvFLAGS(compcv);
748a9306 3349 CvOUTSIDE(cv) = CvOUTSIDE(compcv);
e9a444f0 3350 CvOUTSIDE(compcv) = 0;
748a9306 3351 CvPADLIST(cv) = CvPADLIST(compcv);
4aa0a1f7 3352 CvPADLIST(compcv) = 0;
4633a7c4
LW		 3353 if (SvREFCNT(compcv) > 1) /* XXX Make closures transit through stub. */
3354 CvOUTSIDE(compcv) = (CV*)SvREFCNT_inc((SV*)cv);
748a9306 3355 SvREFCNT_dec(compcv);
a0d0e21e
LW		 3356 }
3357 else {
748a9306 3358 cv = compcv;
44a8e56a 3359 if (name) {
3360 GvCV(gv) = cv;
3361 GvCVGEN(gv) = 0;
3362 sub_generation++;
3363 }
a0d0e21e 3364 }
44a8e56a 3365 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805 3366 CvFILEGV(cv) = curcop->cop_filegv;
8990e307 3367 CvSTASH(cv) = curstash;
11343788
MB		 3368#ifdef USE_THREADS
3369 CvOWNER(cv) = 0;
12ca11f6 3370 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3371 MUTEX_INIT(CvMUTEXP(cv));
11343788 3372#endif /* USE_THREADS */
8990e307 3373
3fe9a6f1 3374 if (ps)
3375 sv_setpv((SV*)cv, ps);
4633a7c4 3376
c07a80fd 3377 if (error_count) {
3378 op_free(block);
3379 block = Nullop;
68dc0745 3380 if (name) {
3381 char *s = strrchr(name, ':');
3382 s = s ? s+1 : name;
6d4c2119
CS		 3383 if (strEQ(s, "BEGIN")) {
3384 char *not_safe =
3385 "BEGIN not safe after errors--compilation aborted";
3386 if (in_eval & 4)
3387 croak(not_safe);
3388 else {
3389 /* force display of errors found but not reported */
38a03e6e
MB		 3390 sv_catpv(ERRSV, not_safe);
3391 croak("%s", SvPVx(ERRSV, na));
6d4c2119
CS		 3392 }
3393 }
68dc0745 3394 }
c07a80fd 3395 }
a0d0e21e 3396 if (!block) {
a0d0e21e
LW		 3397 copline = NOLINE;
3398 LEAVE_SCOPE(floor);
3399 return cv;
3400 }
3401
93965878
NIS		 3402 if (AvFILLp(comppad_name) < AvFILLp(comppad))
3403 av_store(comppad_name, AvFILLp(comppad), Nullsv);
a0d0e21e 3404
54310121 3405 if (CvCLONE(cv)) {
3406 SV **namep = AvARRAY(comppad_name);
93965878 3407 for (ix = AvFILLp(comppad); ix > 0; ix--) {
54310121 3408 SV *namesv;
3409
3410 if (SvIMMORTAL(curpad[ix]))
3411 continue;
3412 /*
3413 * The only things that a clonable function needs in its
3414 * pad are references to outer lexicals and anonymous subs.
3415 * The rest are created anew during cloning.
3416 */
3417 if (!((namesv = namep[ix]) != Nullsv &&
3418 namesv != &sv_undef &&
3419 (SvFAKE(namesv) ||
3420 *SvPVX(namesv) == '&')))
3421 {
3422 SvREFCNT_dec(curpad[ix]);
3423 curpad[ix] = Nullsv;
3424 }
3425 }
a0d0e21e 3426 }
54310121 3427 else {
3428 AV *av = newAV(); /* Will be @_ */
3429 av_extend(av, 0);
3430 av_store(comppad, 0, (SV*)av);
3431 AvFLAGS(av) = AVf_REIFY;
79072805 3432
93965878 3433 for (ix = AvFILLp(comppad); ix > 0; ix--) {
54310121 3434 if (SvIMMORTAL(curpad[ix]))
3435 continue;
3436 if (!SvPADMY(curpad[ix]))
3437 SvPADTMP_on(curpad[ix]);
3438 }
3439 }
79072805 3440
a0d0e21e 3441 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
79072805
LW		 3442 CvSTART(cv) = LINKLIST(CvROOT(cv));
3443 CvROOT(cv)->op_next = 0;
3444 peep(CvSTART(cv));
93a17b20 3445
44a8e56a 3446 if (name) {
3447 char *s;
3448
84902520 3449 if (PERLDB_SUBLINE && curstash != debstash) {
46fc3d4c 3450 SV *sv = NEWSV(0,0);
44a8e56a 3451 SV *tmpstr = sv_newmortal();
549bb64a 3452 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
44a8e56a 3453 CV *cv;
3454 HV *hv;
3455
51790459
MB		 3456 sv_setpvf(sv, "%_:%ld-%ld",
3457 GvSV(curcop->cop_filegv),
3458 (long)subline, (long)curcop->cop_line);
44a8e56a 3459 gv_efullname3(tmpstr, gv, Nullch);
3460 hv_store(GvHV(DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 3461 hv = GvHVn(db_postponed);
9607fc9c 3462 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX(tmpstr), SvCUR(tmpstr))
3463 && (cv = GvCV(db_postponed))) {
44a8e56a 3464 dSP;
3465 PUSHMARK(sp);
3466 XPUSHs(tmpstr);
3467 PUTBACK;
3468 perl_call_sv((SV*)cv, G_DISCARD);
3469 }
3470 }
79072805 3471
44a8e56a 3472 if ((s = strrchr(name,':')))
28757baa 3473 s++;
3474 else
3475 s = name;
68dc0745 3476 if (strEQ(s, "BEGIN")) {
2ae324a7 3477 I32 oldscope = scopestack_ix;
28757baa 3478 ENTER;
3479 SAVESPTR(compiling.cop_filegv);
3480 SAVEI16(compiling.cop_line);
3481 SAVEI32(perldb);
3482 save_svref(&rs);
3483 sv_setsv(rs, nrs);
3484
3485 if (!beginav)
3486 beginav = newAV();
3487 DEBUG_x( dump_sub(gv) );
3488 av_push(beginav, (SV *)cv);
3489 GvCV(gv) = 0;
68dc0745 3490 call_list(oldscope, beginav);
a6006777 3491
28757baa 3492 curcop = &compiling;
3493 LEAVE;
3494 }
3495 else if (strEQ(s, "END") && !error_count) {
3496 if (!endav)
3497 endav = newAV();
3498 av_unshift(endav, 1);
3499 av_store(endav, 0, (SV *)cv);
3500 GvCV(gv) = 0;
3501 }
7d07dbc2
MB		 3502 else if (strEQ(s, "INIT") && !error_count) {
3503 if (!initav)
3504 initav = newAV();
3505 av_push(initav, SvREFCNT_inc(cv));
ae77835f 3506 }
79072805 3507 }
a6006777 3508
aa689395 3509 done:
79072805 3510 copline = NOLINE;
8990e307 3511 LEAVE_SCOPE(floor);
a0d0e21e 3512 return cv;
79072805
LW		 3513}
3514
57d3b86d 3515CV *
aeea060c 3516newXS(char *name, void (*subaddr) (CV *), char *filename)
a0d0e21e 3517{
11343788 3518 dTHR;
44a8e56a 3519 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 3520 register CV *cv;
44a8e56a 3521
3522 if (cv = (name ? GvCV(gv) : Nullcv)) {
3523 if (GvCVGEN(gv)) {
3524 /* just a cached method */
3525 SvREFCNT_dec(cv);
3526 cv = 0;
3527 }
3528 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3529 /* already defined (or promised) */
a0d0e21e
LW		 3530 if (dowarn) {
3531 line_t oldline = curcop->cop_line;
a0d0e21e
LW		 3532 curcop->cop_line = copline;
3533 warn("Subroutine %s redefined",name);
3534 curcop->cop_line = oldline;
3535 }
3536 SvREFCNT_dec(cv);
3537 cv = 0;
79072805 3538 }
79072805 3539 }
44a8e56a 3540
3541 if (cv) /* must reuse cv if autoloaded */
3542 cv_undef(cv);
a0d0e21e
LW		 3543 else {
3544 cv = (CV*)NEWSV(1105,0);
3545 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 3546 if (name) {
3547 GvCV(gv) = cv;
3548 GvCVGEN(gv) = 0;
3549 sub_generation++;
3550 }
a0d0e21e 3551 }
5196be3e 3552 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
11343788 3553#ifdef USE_THREADS
12ca11f6 3554 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3555 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3556 CvOWNER(cv) = 0;
3557#endif /* USE_THREADS */
79072805 3558 CvFILEGV(cv) = gv_fetchfile(filename);
a0d0e21e 3559 CvXSUB(cv) = subaddr;
44a8e56a 3560
28757baa 3561 if (name) {
3562 char *s = strrchr(name,':');
3563 if (s)
3564 s++;
3565 else
3566 s = name;
3567 if (strEQ(s, "BEGIN")) {
3568 if (!beginav)
3569 beginav = newAV();
44a8e56a 3570 av_push(beginav, (SV *)cv);
3571 GvCV(gv) = 0;
28757baa 3572 }
3573 else if (strEQ(s, "END")) {
3574 if (!endav)
3575 endav = newAV();
3576 av_unshift(endav, 1);
44a8e56a 3577 av_store(endav, 0, (SV *)cv);
3578 GvCV(gv) = 0;
28757baa 3579 }
7d07dbc2
MB		 3580 else if (strEQ(s, "INIT")) {
3581 if (!initav)
3582 initav = newAV();
3583 av_push(initav, (SV *)cv);
ae77835f 3584 }
28757baa 3585 }
8990e307 3586 else
a5f75d66 3587 CvANON_on(cv);
44a8e56a 3588
a0d0e21e 3589 return cv;
79072805
LW		 3590}
3591
3592void
8ac85365 3593newFORM(I32 floor, OP *o, OP *block)
79072805 3594{
11343788 3595 dTHR;
79072805
LW		 3596 register CV *cv;
3597 char *name;
3598 GV *gv;
a0d0e21e 3599 I32 ix;
79072805 3600
11343788
MB		 3601 if (o)
3602 name = SvPVx(cSVOPo->op_sv, na);
79072805
LW		 3603 else
3604 name = "STDOUT";
85e6fe83 3605 gv = gv_fetchpv(name,TRUE, SVt_PVFM);
a5f75d66 3606 GvMULTI_on(gv);
79072805
LW		 3607 if (cv = GvFORM(gv)) {
3608 if (dowarn) {
3609 line_t oldline = curcop->cop_line;
3610
3611 curcop->cop_line = copline;
3612 warn("Format %s redefined",name);
3613 curcop->cop_line = oldline;
3614 }
8990e307 3615 SvREFCNT_dec(cv);
79072805 3616 }
748a9306 3617 cv = compcv;
79072805 3618 GvFORM(gv) = cv;
44a8e56a 3619 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
79072805
LW		 3620 CvFILEGV(cv) = curcop->cop_filegv;
3621
93965878 3622 for (ix = AvFILLp(comppad); ix > 0; ix--) {
44a8e56a 3623 if (!SvPADMY(curpad[ix]) && !SvIMMORTAL(curpad[ix]))
a0d0e21e
LW		 3624 SvPADTMP_on(curpad[ix]);
3625 }
3626
79072805
LW		 3627 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
3628 CvSTART(cv) = LINKLIST(CvROOT(cv));
3629 CvROOT(cv)->op_next = 0;
3630 peep(CvSTART(cv));
11343788 3631 op_free(o);
79072805 3632 copline = NOLINE;
8990e307 3633 LEAVE_SCOPE(floor);
79072805
LW		 3634}
3635
3636OP *
8ac85365 3637newANONLIST(OP *o)
79072805 3638{
93a17b20 3639 return newUNOP(OP_REFGEN, 0,
11343788 3640 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 3641}
3642
3643OP *
8ac85365 3644newANONHASH(OP *o)
79072805 3645{
93a17b20 3646 return newUNOP(OP_REFGEN, 0,
11343788 3647 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 3648}
3649
3650OP *
8ac85365 3651newANONSUB(I32 floor, OP *proto, OP *block)
a0d0e21e
LW		 3652{
3653 return newUNOP(OP_REFGEN, 0,
4633a7c4 3654 newSVOP(OP_ANONCODE, 0, (SV*)newSUB(floor, 0, proto, block)));
79072805
LW		 3655}
3656
3657OP *
8ac85365 3658oopsAV(OP *o)
79072805 3659{
ed6116ce
LW		 3660 switch (o->op_type) {
3661 case OP_PADSV:
3662 o->op_type = OP_PADAV;
3663 o->op_ppaddr = ppaddr[OP_PADAV];
3664 return ref(newUNOP(OP_RV2AV, 0, scalar(o)), OP_RV2AV);
3665
3666 case OP_RV2SV:
79072805
LW		 3667 o->op_type = OP_RV2AV;
3668 o->op_ppaddr = ppaddr[OP_RV2AV];
3669 ref(o, OP_RV2AV);
ed6116ce
LW		 3670 break;
3671
3672 default:
79072805 3673 warn("oops: oopsAV");
ed6116ce
LW		 3674 break;
3675 }
79072805
LW		 3676 return o;
3677}
3678
3679OP *
8ac85365 3680oopsHV(OP *o)
79072805 3681{
ed6116ce
LW		 3682 switch (o->op_type) {
3683 case OP_PADSV:
3684 case OP_PADAV:
3685 o->op_type = OP_PADHV;
3686 o->op_ppaddr = ppaddr[OP_PADHV];
3687 return ref(newUNOP(OP_RV2HV, 0, scalar(o)), OP_RV2HV);
3688
3689 case OP_RV2SV:
3690 case OP_RV2AV:
79072805
LW		 3691 o->op_type = OP_RV2HV;
3692 o->op_ppaddr = ppaddr[OP_RV2HV];
3693 ref(o, OP_RV2HV);
ed6116ce
LW		 3694 break;
3695
3696 default:
79072805 3697 warn("oops: oopsHV");
ed6116ce
LW		 3698 break;
3699 }
79072805
LW		 3700 return o;
3701}
3702
3703OP *
8ac85365 3704newAVREF(OP *o)
79072805 3705{
ed6116ce
LW		 3706 if (o->op_type == OP_PADANY) {
3707 o->op_type = OP_PADAV;
3708 o->op_ppaddr = ppaddr[OP_PADAV];
93a17b20 3709 return o;
ed6116ce 3710 }
79072805
LW		 3711 return newUNOP(OP_RV2AV, 0, scalar(o));
3712}
3713
3714OP *
8ac85365 3715newGVREF(I32 type, OP *o)
79072805 3716{
a0d0e21e
LW		 3717 if (type == OP_MAPSTART)
3718 return newUNOP(OP_NULL, 0, o);
748a9306 3719 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 3720}
3721
3722OP *
8ac85365 3723newHVREF(OP *o)
79072805 3724{
ed6116ce
LW		 3725 if (o->op_type == OP_PADANY) {
3726 o->op_type = OP_PADHV;
3727 o->op_ppaddr = ppaddr[OP_PADHV];
93a17b20 3728 return o;
ed6116ce 3729 }
79072805
LW		 3730 return newUNOP(OP_RV2HV, 0, scalar(o));
3731}
3732
3733OP *
8ac85365 3734oopsCV(OP *o)
79072805 3735{
463ee0b2 3736 croak("NOT IMPL LINE %d",__LINE__);
79072805
LW		 3737 /* STUB */
3738 return o;
3739}
3740
3741OP *
8ac85365 3742newCVREF(I32 flags, OP *o)
79072805 3743{
c07a80fd 3744 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 3745}
3746
3747OP *
8ac85365 3748newSVREF(OP *o)
79072805 3749{
ed6116ce
LW		 3750 if (o->op_type == OP_PADANY) {
3751 o->op_type = OP_PADSV;
3752 o->op_ppaddr = ppaddr[OP_PADSV];
93a17b20 3753 return o;
ed6116ce 3754 }
224a4551
MB		 3755 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
3756 o->op_flags |= OPpDONE_SVREF;
a863c7d1 3757 return o;
224a4551 3758 }
79072805
LW		 3759 return newUNOP(OP_RV2SV, 0, scalar(o));
3760}
3761
3762/* Check routines. */
3763
3764OP *
8ac85365 3765ck_anoncode(OP *o)
5f05dabc 3766{
178c6305
CS		 3767 PADOFFSET ix;
3768 SV* name;
3769
3770 name = NEWSV(1106,0);
3771 sv_upgrade(name, SVt_PVNV);
3772 sv_setpvn(name, "&", 1);
3773 SvIVX(name) = -1;
3774 SvNVX(name) = 1;
5dc0d613 3775 ix = pad_alloc(o->op_type, SVs_PADMY);
178c6305 3776 av_store(comppad_name, ix, name);
5dc0d613
MB		 3777 av_store(comppad, ix, cSVOPo->op_sv);
3778 SvPADMY_on(cSVOPo->op_sv);
3779 cSVOPo->op_sv = Nullsv;
3780 cSVOPo->op_targ = ix;
3781 return o;
5f05dabc 3782}
3783
3784OP *
8ac85365 3785ck_bitop(OP *o)
55497cff 3786{
5dc0d613
MB		 3787 o->op_private = hints;
3788 return o;
55497cff 3789}
3790
3791OP *
8ac85365 3792ck_concat(OP *o)
79072805 3793{
11343788
MB		 3794 if (cUNOPo->op_first->op_type == OP_CONCAT)
3795 o->op_flags |= OPf_STACKED;
3796 return o;
79072805
LW		 3797}
3798
3799OP *
8ac85365 3800ck_spair(OP *o)
79072805 3801{
11343788 3802 if (o->op_flags & OPf_KIDS) {
79072805 3803 OP* newop;
a0d0e21e 3804 OP* kid;
5dc0d613
MB		 3805 OPCODE type = o->op_type;
3806 o = modkids(ck_fun(o), type);
11343788 3807 kid = cUNOPo->op_first;
a0d0e21e
LW		 3808 newop = kUNOP->op_first->op_sibling;
3809 if (newop &&
3810 (newop->op_sibling ||
3811 !(opargs[newop->op_type] & OA_RETSCALAR) ||
3812 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
3813 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
aeea060c 3814
11343788 3815 return o;
a0d0e21e
LW		 3816 }
3817 op_free(kUNOP->op_first);
3818 kUNOP->op_first = newop;
3819 }
11343788
MB		 3820 o->op_ppaddr = ppaddr[++o->op_type];
3821 return ck_fun(o);
a0d0e21e
LW		 3822}
3823
3824OP *
8ac85365 3825ck_delete(OP *o)
a0d0e21e 3826{
11343788 3827 o = ck_fun(o);
5dc0d613 3828 o->op_private = 0;
11343788
MB		 3829 if (o->op_flags & OPf_KIDS) {
3830 OP *kid = cUNOPo->op_first;
5f05dabc 3831 if (kid->op_type == OP_HSLICE)
5dc0d613 3832 o->op_private |= OPpSLICE;
5f05dabc 3833 else if (kid->op_type != OP_HELEM)
3834 croak("%s argument is not a HASH element or slice",
5dc0d613 3835 op_desc[o->op_type]);
a0d0e21e 3836 null(kid);
79072805 3837 }
11343788 3838 return o;
79072805
LW		 3839}
3840
3841OP *
8ac85365 3842ck_eof(OP *o)
79072805 3843{
11343788 3844 I32 type = o->op_type;
79072805 3845
11343788
MB		 3846 if (o->op_flags & OPf_KIDS) {
3847 if (cLISTOPo->op_first->op_type == OP_STUB) {
3848 op_free(o);
3849 o = newUNOP(type, OPf_SPECIAL,
d58bf5aa 3850 newGVOP(OP_GV, 0, gv_fetchpv("main::ARGV", TRUE, SVt_PVAV)));
8990e307 3851 }
11343788 3852 return ck_fun(o);
79072805 3853 }
11343788 3854 return o;
79072805
LW		 3855}
3856
3857OP *
8ac85365 3858ck_eval(OP *o)
79072805 3859{
85e6fe83 3860 hints |= HINT_BLOCK_SCOPE;
11343788
MB		 3861 if (o->op_flags & OPf_KIDS) {
3862 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 3863
93a17b20 3864 if (!kid) {
11343788
MB		 3865 o->op_flags &= ~OPf_KIDS;
3866 null(o);
79072805
LW		 3867 }
3868 else if (kid->op_type == OP_LINESEQ) {
3869 LOGOP *enter;
3870
11343788
MB		 3871 kid->op_next = o->op_next;
3872 cUNOPo->op_first = 0;
3873 op_free(o);
79072805
LW		 3874
3875 Newz(1101, enter, 1, LOGOP);
3876 enter->op_type = OP_ENTERTRY;
3877 enter->op_ppaddr = ppaddr[OP_ENTERTRY];
3878 enter->op_private = 0;
3879
3880 /* establish postfix order */
3881 enter->op_next = (OP*)enter;
3882
11343788
MB		 3883 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
3884 o->op_type = OP_LEAVETRY;
3885 o->op_ppaddr = ppaddr[OP_LEAVETRY];
3886 enter->op_other = o;
3887 return o;
79072805 3888 }
c7cc6f1c 3889 else
473986ff 3890 scalar((OP*)kid);
79072805
LW		 3891 }
3892 else {
11343788 3893 op_free(o);
54b9620d 3894 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
79072805 3895 }
11343788
MB		 3896 o->op_targ = (PADOFFSET)hints;
3897 return o;
79072805
LW		 3898}
3899
3900OP *
8ac85365 3901ck_exec(OP *o)
79072805
LW		 3902{
3903 OP *kid;
11343788
MB		 3904 if (o->op_flags & OPf_STACKED) {
3905 o = ck_fun(o);
3906 kid = cUNOPo->op_first->op_sibling;
8990e307
LW		 3907 if (kid->op_type == OP_RV2GV)
3908 null(kid);
79072805 3909 }
463ee0b2 3910 else
11343788
MB		 3911 o = listkids(o);
3912 return o;
79072805
LW		 3913}
3914
3915OP *
8ac85365 3916ck_exists(OP *o)
5f05dabc 3917{
5196be3e
MB		 3918 o = ck_fun(o);
3919 if (o->op_flags & OPf_KIDS) {
3920 OP *kid = cUNOPo->op_first;
5f05dabc 3921 if (kid->op_type != OP_HELEM)
5196be3e 3922 croak("%s argument is not a HASH element", op_desc[o->op_type]);
5f05dabc 3923 null(kid);
3924 }
5196be3e 3925 return o;
5f05dabc 3926}
3927
3928OP *
8ac85365 3929ck_gvconst(register OP *o)
79072805
LW		 3930{
3931 o = fold_constants(o);
3932 if (o->op_type == OP_CONST)
3933 o->op_type = OP_GV;
3934 return o;
3935}
3936
3937OP *
8ac85365 3938ck_rvconst(register OP *o)
79072805 3939{
11343788
MB		 3940 dTHR;
3941 SVOP *kid = (SVOP*)cUNOPo->op_first;
85e6fe83 3942
11343788 3943 o->op_private |= (hints & HINT_STRICT_REFS);
79072805 3944 if (kid->op_type == OP_CONST) {
44a8e56a 3945 char *name;
3946 int iscv;
3947 GV *gv;
3948
3949 name = SvPV(kid->op_sv, na);
3950 if ((hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
3951 char *badthing = Nullch;
5dc0d613 3952 switch (o->op_type) {
44a8e56a 3953 case OP_RV2SV:
3954 badthing = "a SCALAR";
3955 break;
3956 case OP_RV2AV:
3957 badthing = "an ARRAY";
3958 break;
3959 case OP_RV2HV:
3960 badthing = "a HASH";
3961 break;
3962 }
3963 if (badthing)
3964 croak(
3965 "Can't use bareword (\"%s\") as %s ref while \"strict refs\" in use",
3966 name, badthing);
3967 }
93233ece
CS		 3968 /*
3969 * This is a little tricky. We only want to add the symbol if we
3970 * didn't add it in the lexer. Otherwise we get duplicate strict
3971 * warnings. But if we didn't add it in the lexer, we must at
3972 * least pretend like we wanted to add it even if it existed before,
3973 * or we get possible typo warnings. OPpCONST_ENTERED says
3974 * whether the lexer already added THIS instance of this symbol.
3975 */
5196be3e 3976 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 3977 do {
44a8e56a 3978 gv = gv_fetchpv(name,
748a9306 3979 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 3980 iscv
3981 ? SVt_PVCV
11343788 3982 : o->op_type == OP_RV2SV
a0d0e21e 3983 ? SVt_PV
11343788 3984 : o->op_type == OP_RV2AV
a0d0e21e 3985 ? SVt_PVAV
11343788 3986 : o->op_type == OP_RV2HV
a0d0e21e
LW		 3987 ? SVt_PVHV
3988 : SVt_PVGV);
93233ece
CS		 3989 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
3990 if (gv) {
3991 kid->op_type = OP_GV;
3992 SvREFCNT_dec(kid->op_sv);
3993 kid->op_sv = SvREFCNT_inc(gv);
a0d0e21e 3994 }
79072805 3995 }
11343788 3996 return o;
79072805
LW		 3997}
3998
3999OP *
8ac85365 4000ck_ftst(OP *o)
79072805 4001{
11343788
MB		 4002 dTHR;
4003 I32 type = o->op_type;
79072805 4004
11343788
MB		 4005 if (o->op_flags & OPf_REF)
4006 return o;
79072805 4007
11343788
MB		 4008 if (o->op_flags & OPf_KIDS) {
4009 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805
LW		 4010
4011 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
a0d0e21e 4012 OP *newop = newGVOP(type, OPf_REF,
85e6fe83 4013 gv_fetchpv(SvPVx(kid->op_sv, na), TRUE, SVt_PVIO));
11343788 4014 op_free(o);
79072805
LW		 4015 return newop;
4016 }
4017 }
4018 else {
11343788 4019 op_free(o);
79072805 4020 if (type == OP_FTTTY)
fb73857a 4021 return newGVOP(type, OPf_REF, gv_fetchpv("main::STDIN", TRUE,
85e6fe83 4022 SVt_PVIO));
79072805 4023 else
54b9620d 4024 return newUNOP(type, 0, newDEFSVOP());
79072805 4025 }
11343788 4026 return o;
79072805
LW		 4027}
4028
4029OP *
8ac85365 4030ck_fun(OP *o)
79072805 4031{
11343788 4032 dTHR;
79072805
LW		 4033 register OP *kid;
4034 OP **tokid;
4035 OP *sibl;
4036 I32 numargs = 0;
11343788 4037 int type = o->op_type;
a0d0e21e 4038 register I32 oa = opargs[type] >> OASHIFT;
aeea060c 4039
11343788 4040 if (o->op_flags & OPf_STACKED) {
79072805
LW		 4041 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
4042 oa &= ~OA_OPTIONAL;
4043 else
11343788 4044 return no_fh_allowed(o);
79072805
LW		 4045 }
4046
11343788
MB		 4047 if (o->op_flags & OPf_KIDS) {
4048 tokid = &cLISTOPo->op_first;
4049 kid = cLISTOPo->op_first;
8990e307
LW		 4050 if (kid->op_type == OP_PUSHMARK ||
4051 kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK)
4052 {
79072805
LW		 4053 tokid = &kid->op_sibling;
4054 kid = kid->op_sibling;
4055 }
a0d0e21e 4056 if (!kid && opargs[type] & OA_DEFGV)
54b9620d 4057 *tokid = kid = newDEFSVOP();
79072805
LW		 4058
4059 while (oa && kid) {
4060 numargs++;
4061 sibl = kid->op_sibling;
4062 switch (oa & 7) {
4063 case OA_SCALAR:
4064 scalar(kid);
4065 break;
4066 case OA_LIST:
4067 if (oa < 16) {
4068 kid = 0;
4069 continue;
4070 }
4071 else
4072 list(kid);
4073 break;
4074 case OA_AVREF:
4075 if (kid->op_type == OP_CONST &&
4076 (kid->op_private & OPpCONST_BARE)) {
463ee0b2 4077 char *name = SvPVx(((SVOP*)kid)->op_sv, na);
79072805 4078 OP *newop = newAVREF(newGVOP(OP_GV, 0,
85e6fe83 4079 gv_fetchpv(name, TRUE, SVt_PVAV) ));
463ee0b2 4080 if (dowarn)
ff0cee69 4081 warn("Array @%s missing the @ in argument %ld of %s()",
4082 name, (long)numargs, op_desc[type]);
79072805
LW		 4083 op_free(kid);
4084 kid = newop;
4085 kid->op_sibling = sibl;
4086 *tokid = kid;
4087 }
8990e307 4088 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
11343788 4089 bad_type(numargs, "array", op_desc[o->op_type], kid);
a0d0e21e 4090 mod(kid, type);
79072805
LW		 4091 break;
4092 case OA_HVREF:
4093 if (kid->op_type == OP_CONST &&
4094 (kid->op_private & OPpCONST_BARE)) {
463ee0b2 4095 char *name = SvPVx(((SVOP*)kid)->op_sv, na);
79072805 4096 OP *newop = newHVREF(newGVOP(OP_GV, 0,
85e6fe83 4097 gv_fetchpv(name, TRUE, SVt_PVHV) ));
463ee0b2 4098 if (dowarn)
ff0cee69 4099 warn("Hash %%%s missing the %% in argument %ld of %s()",
4100 name, (long)numargs, op_desc[type]);
79072805
LW		 4101 op_free(kid);
4102 kid = newop;
4103 kid->op_sibling = sibl;
4104 *tokid = kid;
4105 }
8990e307 4106 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
11343788 4107 bad_type(numargs, "hash", op_desc[o->op_type], kid);
a0d0e21e 4108 mod(kid, type);
79072805
LW		 4109 break;
4110 case OA_CVREF:
4111 {
a0d0e21e 4112 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 4113 kid->op_sibling = 0;
4114 linklist(kid);
4115 newop->op_next = newop;
4116 kid = newop;
4117 kid->op_sibling = sibl;
4118 *tokid = kid;
4119 }
4120 break;
4121 case OA_FILEREF:
4122 if (kid->op_type != OP_GV) {
4123 if (kid->op_type == OP_CONST &&
4124 (kid->op_private & OPpCONST_BARE)) {
4125 OP *newop = newGVOP(OP_GV, 0,
85e6fe83
LW		 4126 gv_fetchpv(SvPVx(((SVOP*)kid)->op_sv, na), TRUE,
4127 SVt_PVIO) );
79072805
LW		 4128 op_free(kid);
4129 kid = newop;
4130 }
4131 else {
4132 kid->op_sibling = 0;
4133 kid = newUNOP(OP_RV2GV, 0, scalar(kid));
4134 }
4135 kid->op_sibling = sibl;
4136 *tokid = kid;
4137 }
4138 scalar(kid);
4139 break;
4140 case OA_SCALARREF:
a0d0e21e 4141 mod(scalar(kid), type);
79072805
LW		 4142 break;
4143 }
4144 oa >>= 4;
4145 tokid = &kid->op_sibling;
4146 kid = kid->op_sibling;
4147 }
11343788 4148 o->op_private |= numargs;
79072805 4149 if (kid)
11343788
MB		 4150 return too_many_arguments(o,op_desc[o->op_type]);
4151 listkids(o);
79072805 4152 }
a0d0e21e 4153 else if (opargs[type] & OA_DEFGV) {
11343788 4154 op_free(o);
54b9620d 4155 return newUNOP(type, 0, newDEFSVOP());
a0d0e21e
LW		 4156 }
4157
79072805
LW		 4158 if (oa) {
4159 while (oa & OA_OPTIONAL)
4160 oa >>= 4;
4161 if (oa && oa != OA_LIST)
11343788 4162 return too_few_arguments(o,op_desc[o->op_type]);
79072805 4163 }
11343788 4164 return o;
79072805
LW		 4165}
4166
4167OP *
8ac85365 4168ck_glob(OP *o)
79072805 4169{
fb73857a 4170 GV *gv;
4171
1f2bfc8a 4172 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 4173 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 4174
4175 if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV)) && GvIMPORTED_CV(gv)))
4176 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
b1cb66bf 4177
4178 if (gv && GvIMPORTED_CV(gv)) {
46fc3d4c 4179 static int glob_index;
4180
5196be3e 4181 append_elem(OP_GLOB, o,
46fc3d4c 4182 newSVOP(OP_CONST, 0, newSViv(glob_index++)));
1f2bfc8a
MB		 4183 o->op_type = OP_LIST;
4184 o->op_ppaddr = ppaddr[OP_LIST];
4185 cLISTOPo->op_first->op_type = OP_PUSHMARK;
4186 cLISTOPo->op_first->op_ppaddr = ppaddr[OP_PUSHMARK];
4187 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 4188 append_elem(OP_LIST, o,
1f2bfc8a
MB		 4189 scalar(newUNOP(OP_RV2CV, 0,
4190 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 4191 o = newUNOP(OP_NULL, 0, ck_subr(o));
4192 o->op_targ = OP_GLOB; /* hint at what it used to be */
4193 return o;
b1cb66bf 4194 }
4195 gv = newGVgen("main");
a0d0e21e 4196 gv_IOadd(gv);
11343788
MB		 4197 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
4198 scalarkids(o);
4199 return ck_fun(o);
79072805
LW		 4200}
4201
4202OP *
8ac85365 4203ck_grep(OP *o)
79072805
LW		 4204{
4205 LOGOP *gwop;
4206 OP *kid;
11343788 4207 OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
79072805 4208
11343788 4209 o->op_ppaddr = ppaddr[OP_GREPSTART];
a0d0e21e 4210 Newz(1101, gwop, 1, LOGOP);
aeea060c 4211
11343788 4212 if (o->op_flags & OPf_STACKED) {
a0d0e21e 4213 OP* k;
11343788
MB		 4214 o = ck_sort(o);
4215 kid = cLISTOPo->op_first->op_sibling;
4216 for (k = cLISTOPo->op_first->op_sibling->op_next; k; k = k->op_next) {
a0d0e21e
LW		 4217 kid = k;
4218 }
4219 kid->op_next = (OP*)gwop;
11343788 4220 o->op_flags &= ~OPf_STACKED;
93a17b20 4221 }
11343788 4222 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 4223 if (type == OP_MAPWHILE)
4224 list(kid);
4225 else
4226 scalar(kid);
11343788 4227 o = ck_fun(o);
79072805 4228 if (error_count)
11343788 4229 return o;
aeea060c 4230 kid = cLISTOPo->op_first->op_sibling;
79072805 4231 if (kid->op_type != OP_NULL)
463ee0b2 4232 croak("panic: ck_grep");
79072805
LW		 4233 kid = kUNOP->op_first;
4234
a0d0e21e
LW		 4235 gwop->op_type = type;
4236 gwop->op_ppaddr = ppaddr[type];
11343788 4237 gwop->op_first = listkids(o);
79072805
LW		 4238 gwop->op_flags |= OPf_KIDS;
4239 gwop->op_private = 1;
4240 gwop->op_other = LINKLIST(kid);
a0d0e21e 4241 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
79072805
LW		 4242 kid->op_next = (OP*)gwop;
4243
11343788 4244 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 4245 if (!kid || !kid->op_sibling)
11343788 4246 return too_few_arguments(o,op_desc[o->op_type]);
a0d0e21e
LW		 4247 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
4248 mod(kid, OP_GREPSTART);
4249
79072805
LW		 4250 return (OP*)gwop;
4251}
4252
4253OP *
8ac85365 4254ck_index(OP *o)
79072805 4255{
11343788
MB		 4256 if (o->op_flags & OPf_KIDS) {
4257 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
79072805 4258 if (kid && kid->op_type == OP_CONST)
bbce6d69 4259 fbm_compile(((SVOP*)kid)->op_sv);
79072805 4260 }
11343788 4261 return ck_fun(o);
79072805
LW		 4262}
4263
4264OP *
8ac85365 4265ck_lengthconst(OP *o)
79072805
LW		 4266{
4267 /* XXX length optimization goes here */
11343788 4268 return ck_fun(o);
79072805
LW		 4269}
4270
4271OP *
8ac85365 4272ck_lfun(OP *o)
79072805 4273{
5dc0d613
MB		 4274 OPCODE type = o->op_type;
4275 return modkids(ck_fun(o), type);
79072805
LW		 4276}
4277
4278OP *
8ac85365 4279ck_rfun(OP *o)
8990e307 4280{
5dc0d613
MB		 4281 OPCODE type = o->op_type;
4282 return refkids(ck_fun(o), type);
8990e307
LW		 4283}
4284
4285OP *
8ac85365 4286ck_listiob(OP *o)
79072805
LW		 4287{
4288 register OP *kid;
aeea060c 4289
11343788 4290 kid = cLISTOPo->op_first;
79072805 4291 if (!kid) {
11343788
MB		 4292 o = force_list(o);
4293 kid = cLISTOPo->op_first;
79072805
LW		 4294 }
4295 if (kid->op_type == OP_PUSHMARK)
4296 kid = kid->op_sibling;
11343788 4297 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 4298 kid = kid->op_sibling;
4299 else if (kid && !kid->op_sibling) { /* print HANDLE; */
4300 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 4301 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 4302 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 4303 cLISTOPo->op_first->op_sibling = kid;
4304 cLISTOPo->op_last = kid;
79072805
LW		 4305 kid = kid->op_sibling;
4306 }
4307 }
4308
4309 if (!kid)
54b9620d 4310 append_elem(o->op_type, o, newDEFSVOP());
79072805 4311
5dc0d613 4312 o = listkids(o);
bbce6d69 4313
5dc0d613 4314 o->op_private = 0;
36477c24 4315#ifdef USE_LOCALE
bbce6d69 4316 if (hints & HINT_LOCALE)
5dc0d613 4317 o->op_private |= OPpLOCALE;
bbce6d69 4318#endif
4319
5dc0d613 4320 return o;
bbce6d69 4321}
4322
4323OP *
8ac85365 4324ck_fun_locale(OP *o)
bbce6d69 4325{
5dc0d613 4326 o = ck_fun(o);
bbce6d69 4327
5dc0d613 4328 o->op_private = 0;
36477c24 4329#ifdef USE_LOCALE
bbce6d69 4330 if (hints & HINT_LOCALE)
5dc0d613 4331 o->op_private |= OPpLOCALE;
bbce6d69 4332#endif
4333
5dc0d613 4334 return o;
bbce6d69 4335}
4336
4337OP *
8ac85365 4338ck_scmp(OP *o)
bbce6d69 4339{
5dc0d613 4340 o->op_private = 0;
36477c24 4341#ifdef USE_LOCALE
bbce6d69 4342 if (hints & HINT_LOCALE)
5dc0d613 4343 o->op_private |= OPpLOCALE;
bbce6d69 4344#endif
36477c24 4345
5dc0d613 4346 return o;
79072805
LW		 4347}
4348
4349OP *
8ac85365 4350ck_match(OP *o)
79072805 4351{
5dc0d613 4352 o->op_private |= OPpRUNTIME;
11343788 4353 return o;
79072805
LW		 4354}
4355
4356OP *
8ac85365 4357ck_null(OP *o)
79072805 4358{
11343788 4359 return o;
79072805
LW		 4360}
4361
4362OP *
8ac85365 4363ck_repeat(OP *o)
79072805 4364{
11343788
MB		 4365 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
4366 o->op_private |= OPpREPEAT_DOLIST;
4367 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 4368 }
4369 else
11343788
MB		 4370 scalar(o);
4371 return o;
79072805
LW		 4372}
4373
4374OP *
8ac85365 4375ck_require(OP *o)
8990e307 4376{
11343788
MB		 4377 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
4378 SVOP *kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 4379
4380 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
8990e307 4381 char *s;
a0d0e21e
LW		 4382 for (s = SvPVX(kid->op_sv); *s; s++) {
4383 if (*s == ':' && s[1] == ':') {
4384 *s = '/';
1aef975c 4385 Move(s+2, s+1, strlen(s+2)+1, char);
a0d0e21e
LW		 4386 --SvCUR(kid->op_sv);
4387 }
8990e307 4388 }
a0d0e21e 4389 sv_catpvn(kid->op_sv, ".pm", 3);
8990e307
LW		 4390 }
4391 }
11343788 4392 return ck_fun(o);
8990e307
LW		 4393}
4394
4395OP *
8ac85365 4396ck_retarget(OP *o)
79072805 4397{
463ee0b2 4398 croak("NOT IMPL LINE %d",__LINE__);
79072805 4399 /* STUB */
11343788 4400 return o;
79072805
LW		 4401}
4402
4403OP *
8ac85365 4404ck_select(OP *o)
79072805 4405{
c07a80fd 4406 OP* kid;
11343788
MB		 4407 if (o->op_flags & OPf_KIDS) {
4408 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 4409 if (kid && kid->op_sibling) {
11343788
MB		 4410 o->op_type = OP_SSELECT;
4411 o->op_ppaddr = ppaddr[OP_SSELECT];
4412 o = ck_fun(o);
4413 return fold_constants(o);
79072805
LW		 4414 }
4415 }
11343788
MB		 4416 o = ck_fun(o);
4417 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 4418 if (kid && kid->op_type == OP_RV2GV)
4419 kid->op_private &= ~HINT_STRICT_REFS;
11343788 4420 return o;
79072805
LW		 4421}
4422
4423OP *
8ac85365 4424ck_shift(OP *o)
79072805 4425{
11343788 4426 I32 type = o->op_type;
79072805 4427
11343788 4428 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2
MB		 4429 OP *argop;
4430
11343788 4431 op_free(o);
6d4ff0d2 4432#ifdef USE_THREADS
977336f5 4433 if (!CvUNIQUE(compcv)) {
6d4ff0d2
MB		 4434 argop = newOP(OP_PADAV, OPf_REF);
4435 argop->op_targ = 0; /* curpad[0] is @_ */
4436 }
4437 else {
4438 argop = newUNOP(OP_RV2AV, 0,
4439 scalar(newGVOP(OP_GV, 0,
4440 gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
4441 }
4442#else
4443 argop = newUNOP(OP_RV2AV, 0,
977336f5 4444 scalar(newGVOP(OP_GV, 0, !CvUNIQUE(compcv) ?
6d4ff0d2
MB		 4445 defgv : gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
4446#endif /* USE_THREADS */
4447 return newUNOP(type, 0, scalar(argop));
79072805 4448 }
11343788 4449 return scalar(modkids(ck_fun(o), type));
79072805
LW		 4450}
4451
4452OP *
8ac85365 4453ck_sort(OP *o)
79072805 4454{
5dc0d613 4455 o->op_private = 0;
36477c24 4456#ifdef USE_LOCALE
bbce6d69 4457 if (hints & HINT_LOCALE)
5dc0d613 4458 o->op_private |= OPpLOCALE;
bbce6d69 4459#endif
4460
11343788
MB		 4461 if (o->op_flags & OPf_STACKED) {
4462 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
463ee0b2
LW		 4463 OP *k;
4464 kid = kUNOP->op_first; /* get past rv2gv */
79072805 4465
463ee0b2 4466 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 4467 linklist(kid);
463ee0b2
LW		 4468 if (kid->op_type == OP_SCOPE) {
4469 k = kid->op_next;
4470 kid->op_next = 0;
79072805 4471 }
463ee0b2 4472 else if (kid->op_type == OP_LEAVE) {
11343788 4473 if (o->op_type == OP_SORT) {
748a9306
LW		 4474 null(kid); /* wipe out leave */
4475 kid->op_next = kid;
463ee0b2 4476
748a9306
LW		 4477 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
4478 if (k->op_next == kid)
4479 k->op_next = 0;
4480 }
463ee0b2 4481 }
748a9306
LW		 4482 else
4483 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 4484 k = kLISTOP->op_first;
463ee0b2 4485 }
a0d0e21e
LW		 4486 peep(k);
4487
11343788 4488 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
8990e307 4489 null(kid); /* wipe out rv2gv */
11343788 4490 if (o->op_type == OP_SORT)
a0d0e21e
LW		 4491 kid->op_next = kid;
4492 else
4493 kid->op_next = k;
11343788 4494 o->op_flags |= OPf_SPECIAL;
79072805
LW		 4495 }
4496 }
bbce6d69 4497
11343788 4498 return o;
79072805
LW		 4499}
4500
4501OP *
8ac85365 4502ck_split(OP *o)
79072805
LW		 4503{
4504 register OP *kid;
aeea060c 4505
11343788
MB		 4506 if (o->op_flags & OPf_STACKED)
4507 return no_fh_allowed(o);
79072805 4508
11343788 4509 kid = cLISTOPo->op_first;
8990e307 4510 if (kid->op_type != OP_NULL)
463ee0b2 4511 croak("panic: ck_split");
8990e307 4512 kid = kid->op_sibling;
11343788
MB		 4513 op_free(cLISTOPo->op_first);
4514 cLISTOPo->op_first = kid;
85e6fe83 4515 if (!kid) {
11343788
MB		 4516 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpv(" ", 1));
4517 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 4518 }
79072805
LW		 4519
4520 if (kid->op_type != OP_MATCH) {
4521 OP *sibl = kid->op_sibling;
463ee0b2 4522 kid->op_sibling = 0;
79072805 4523 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, Nullop);
11343788
MB		 4524 if (cLISTOPo->op_first == cLISTOPo->op_last)
4525 cLISTOPo->op_last = kid;
4526 cLISTOPo->op_first = kid;
79072805
LW		 4527 kid->op_sibling = sibl;
4528 }
4529
4530 kid->op_type = OP_PUSHRE;
4531 kid->op_ppaddr = ppaddr[OP_PUSHRE];
4532 scalar(kid);
4533
4534 if (!kid->op_sibling)
54b9620d 4535 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 4536
4537 kid = kid->op_sibling;
4538 scalar(kid);
4539
4540 if (!kid->op_sibling)
11343788 4541 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
79072805
LW		 4542
4543 kid = kid->op_sibling;
4544 scalar(kid);
4545
4546 if (kid->op_sibling)
11343788 4547 return too_many_arguments(o,op_desc[o->op_type]);
79072805 4548
11343788 4549 return o;
79072805
LW		 4550}
4551
4552OP *
8ac85365 4553ck_subr(OP *o)
79072805 4554{
11343788
MB		 4555 dTHR;
4556 OP *prev = ((cUNOPo->op_first->op_sibling)
4557 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
4558 OP *o2 = prev->op_sibling;
4633a7c4
LW		 4559 OP *cvop;
4560 char *proto = 0;
4561 CV *cv = 0;
46fc3d4c 4562 GV *namegv = 0;
4633a7c4
LW		 4563 int optional = 0;
4564 I32 arg = 0;
4565
11343788 4566 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 4567 if (cvop->op_type == OP_RV2CV) {
4568 SVOP* tmpop;
11343788 4569 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
4633a7c4
LW		 4570 null(cvop); /* disable rv2cv */
4571 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
4572 if (tmpop->op_type == OP_GV) {
8ebc5c01 4573 cv = GvCVu(tmpop->op_sv);
5dc0d613 4574 if (cv && SvPOK(cv) && !(o->op_private & OPpENTERSUB_AMPER)) {
46fc3d4c 4575 namegv = CvANON(cv) ? (GV*)tmpop->op_sv : CvGV(cv);
4576 proto = SvPV((SV*)cv, na);
4577 }
4633a7c4
LW		 4578 }
4579 }
11343788 4580 o->op_private |= (hints & HINT_STRICT_REFS);
84902520 4581 if (PERLDB_SUB && curstash != debstash)
11343788
MB		 4582 o->op_private |= OPpENTERSUB_DB;
4583 while (o2 != cvop) {
4633a7c4
LW		 4584 if (proto) {
4585 switch (*proto) {
4586 case '\0':
5dc0d613 4587 return too_many_arguments(o, gv_ename(namegv));
4633a7c4
LW		 4588 case ';':
4589 optional = 1;
4590 proto++;
4591 continue;
4592 case '$':
4593 proto++;
4594 arg++;
11343788 4595 scalar(o2);
4633a7c4
LW		 4596 break;
4597 case '%':
4598 case '@':
11343788 4599 list(o2);
4633a7c4
LW		 4600 arg++;
4601 break;
4602 case '&':
4603 proto++;
4604 arg++;
11343788 4605 if (o2->op_type != OP_REFGEN && o2->op_type != OP_UNDEF)
5dc0d613 4606 bad_type(arg, "block", gv_ename(namegv), o2);
4633a7c4
LW		 4607 break;
4608 case '*':
4609 proto++;
4610 arg++;
11343788 4611 if (o2->op_type == OP_RV2GV)
4633a7c4
LW		 4612 goto wrapref;
4613 {
11343788 4614 OP* kid = o2;
69dcf70c 4615 OP* sib = kid->op_sibling;
4633a7c4 4616 kid->op_sibling = 0;
69dcf70c
MB		 4617 o2 = newUNOP(OP_RV2GV, 0, kid);
4618 o2->op_sibling = sib;
6fa846a0 4619 prev->op_sibling = o2;
4633a7c4
LW		 4620 }
4621 goto wrapref;
4622 case '\\':
4623 proto++;
4624 arg++;
4625 switch (*proto++) {
4626 case '*':
11343788 4627 if (o2->op_type != OP_RV2GV)
5dc0d613 4628 bad_type(arg, "symbol", gv_ename(namegv), o2);
4633a7c4
LW		 4629 goto wrapref;
4630 case '&':
11343788 4631 if (o2->op_type != OP_RV2CV)
5dc0d613 4632 bad_type(arg, "sub", gv_ename(namegv), o2);
4633a7c4
LW		 4633 goto wrapref;
4634 case '$':
11343788 4635 if (o2->op_type != OP_RV2SV && o2->op_type != OP_PADSV)
5dc0d613 4636 bad_type(arg, "scalar", gv_ename(namegv), o2);
4633a7c4
LW		 4637 goto wrapref;
4638 case '@':
11343788 4639 if (o2->op_type != OP_RV2AV && o2->op_type != OP_PADAV)
5dc0d613 4640 bad_type(arg, "array", gv_ename(namegv), o2);
4633a7c4
LW		 4641 goto wrapref;
4642 case '%':
11343788 4643 if (o2->op_type != OP_RV2HV && o2->op_type != OP_PADHV)
5dc0d613 4644 bad_type(arg, "hash", gv_ename(namegv), o2);
4633a7c4
LW		 4645 wrapref:
4646 {
11343788 4647 OP* kid = o2;
6fa846a0 4648 OP* sib = kid->op_sibling;
4633a7c4 4649 kid->op_sibling = 0;
6fa846a0
GS		 4650 o2 = newUNOP(OP_REFGEN, 0, kid);
4651 o2->op_sibling = sib;
e858de61 4652 prev->op_sibling = o2;
4633a7c4
LW		 4653 }
4654 break;
4655 default: goto oops;
4656 }
4657 break;
b1cb66bf 4658 case ' ':
4659 proto++;
4660 continue;
4633a7c4
LW		 4661 default:
4662 oops:
4663 croak("Malformed prototype for %s: %s",
46fc3d4c 4664 gv_ename(namegv), SvPV((SV*)cv, na));
4633a7c4
LW		 4665 }
4666 }
4667 else
11343788
MB		 4668 list(o2);
4669 mod(o2, OP_ENTERSUB);
4670 prev = o2;
4671 o2 = o2->op_sibling;
4633a7c4 4672 }
fb73857a 4673 if (proto && !optional &&
4674 (*proto && *proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 4675 return too_few_arguments(o, gv_ename(namegv));
11343788 4676 return o;
79072805
LW		 4677}
4678
4679OP *
8ac85365 4680ck_svconst(OP *o)
8990e307 4681{
11343788
MB		 4682 SvREADONLY_on(cSVOPo->op_sv);
4683 return o;
8990e307
LW		 4684}
4685
4686OP *
8ac85365 4687ck_trunc(OP *o)
79072805 4688{
11343788
MB		 4689 if (o->op_flags & OPf_KIDS) {
4690 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 4691
a0d0e21e
LW		 4692 if (kid->op_type == OP_NULL)
4693 kid = (SVOP*)kid->op_sibling;
4694 if (kid &&
4695 kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE))
11343788 4696 o->op_flags |= OPf_SPECIAL;
79072805 4697 }
11343788 4698 return ck_fun(o);
79072805
LW		 4699}
4700
463ee0b2
LW		 4701/* A peephole optimizer. We visit the ops in the order they're to execute. */
4702
79072805 4703void
8ac85365 4704peep(register OP *o)
79072805 4705{
11343788 4706 dTHR;
79072805 4707 register OP* oldop = 0;
a0d0e21e 4708 if (!o || o->op_seq)
79072805 4709 return;
a0d0e21e 4710 ENTER;
462e5cf6 4711 SAVEOP();
a0d0e21e
LW		 4712 SAVESPTR(curcop);
4713 for (; o; o = o->op_next) {
4714 if (o->op_seq)
4715 break;
c07a80fd 4716 if (!op_seqmax)
4717 op_seqmax++;
a0d0e21e
LW		 4718 op = o;
4719 switch (o->op_type) {
4720 case OP_NEXTSTATE:
4721 case OP_DBSTATE:
4722 curcop = ((COP*)o); /* for warnings */
c07a80fd 4723 o->op_seq = op_seqmax++;
a0d0e21e
LW		 4724 break;
4725
4726 case OP_CONCAT:
4727 case OP_CONST:
4728 case OP_JOIN:
4729 case OP_UC:
4730 case OP_UCFIRST:
4731 case OP_LC:
4732 case OP_LCFIRST:
4733 case OP_QUOTEMETA:
3c4f770c 4734 if (o->op_next && o->op_next->op_type == OP_STRINGIFY)
a0d0e21e 4735 null(o->op_next);
c07a80fd 4736 o->op_seq = op_seqmax++;
a0d0e21e 4737 break;
8990e307 4738 case OP_STUB:
54310121 4739 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
c07a80fd 4740 o->op_seq = op_seqmax++;
54310121 4741 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 4742 }
748a9306 4743 goto nothin;
79072805 4744 case OP_NULL:
748a9306 4745 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
7766148a 4746 curcop = ((COP*)o);
748a9306 4747 goto nothin;
79072805 4748 case OP_SCALAR:
93a17b20 4749 case OP_LINESEQ:
463ee0b2 4750 case OP_SCOPE:
748a9306 4751 nothin:
a0d0e21e
LW		 4752 if (oldop && o->op_next) {
4753 oldop->op_next = o->op_next;
79072805
LW		 4754 continue;
4755 }
c07a80fd 4756 o->op_seq = op_seqmax++;
79072805
LW		 4757 break;
4758
4759 case OP_GV:
a0d0e21e 4760 if (o->op_next->op_type == OP_RV2SV) {
5f05dabc 4761 if (!(o->op_next->op_private & OPpDEREF)) {
a0d0e21e
LW		 4762 null(o->op_next);
4763 o->op_private |= o->op_next->op_private & OPpLVAL_INTRO;
4764 o->op_next = o->op_next->op_next;
4765 o->op_type = OP_GVSV;
4766 o->op_ppaddr = ppaddr[OP_GVSV];
8990e307
LW		 4767 }
4768 }
a0d0e21e
LW		 4769 else if (o->op_next->op_type == OP_RV2AV) {
4770 OP* pop = o->op_next->op_next;
4771 IV i;
8990e307 4772 if (pop->op_type == OP_CONST &&
e858de61 4773 (op = pop->op_next) &&
8990e307 4774 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 4775 !(pop->op_next->op_private &
68dc0745 4776 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF)) &&
a0d0e21e
LW		 4777 (i = SvIV(((SVOP*)pop)->op_sv) - compiling.cop_arybase)
4778 <= 255 &&
8990e307
LW		 4779 i >= 0)
4780 {
748a9306 4781 SvREFCNT_dec(((SVOP*)pop)->op_sv);
a0d0e21e 4782 null(o->op_next);
8990e307
LW		 4783 null(pop->op_next);
4784 null(pop);
a0d0e21e
LW		 4785 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
4786 o->op_next = pop->op_next->op_next;
4787 o->op_type = OP_AELEMFAST;
4788 o->op_ppaddr = ppaddr[OP_AELEMFAST];
4789 o->op_private = (U8)i;
a6006777 4790 GvAVn(((GVOP*)o)->op_gv);
8990e307 4791 }
79072805 4792 }
c07a80fd 4793 o->op_seq = op_seqmax++;
79072805
LW		 4794 break;
4795
af41f3ca
MB		 4796 case OP_PADAV:
4797 if (o->op_next->op_type == OP_RV2AV
4798 && (o->op_next->op_flags && OPf_REF))
4799 {
4800 null(o->op_next);
4801 o->op_next = o->op_next->op_next;
4802 }
4803 break;
aeea060c 4804
af41f3ca
MB		 4805 case OP_PADHV:
4806 if (o->op_next->op_type == OP_RV2HV
4807 && (o->op_next->op_flags && OPf_REF))
4808 {
4809 null(o->op_next);
4810 o->op_next = o->op_next->op_next;
4811 }
4812 break;
4813
a0d0e21e 4814 case OP_MAPWHILE:
79072805
LW		 4815 case OP_GREPWHILE:
4816 case OP_AND:
4817 case OP_OR:
c07a80fd 4818 o->op_seq = op_seqmax++;
fd4d1407
IZ		 4819 while (cLOGOP->op_other->op_type == OP_NULL)
4820 cLOGOP->op_other = cLOGOP->op_other->op_next;
79072805
LW		 4821 peep(cLOGOP->op_other);
4822 break;
4823
4824 case OP_COND_EXPR:
c07a80fd 4825 o->op_seq = op_seqmax++;
79072805
LW		 4826 peep(cCONDOP->op_true);
4827 peep(cCONDOP->op_false);
4828 break;
4829
4830 case OP_ENTERLOOP:
c07a80fd 4831 o->op_seq = op_seqmax++;
79072805
LW		 4832 peep(cLOOP->op_redoop);
4833 peep(cLOOP->op_nextop);
4834 peep(cLOOP->op_lastop);
4835 break;
4836
4837 case OP_MATCH:
4838 case OP_SUBST:
c07a80fd 4839 o->op_seq = op_seqmax++;
a0d0e21e 4840 peep(cPMOP->op_pmreplstart);
79072805
LW		 4841 break;
4842
a0d0e21e 4843 case OP_EXEC:
c07a80fd 4844 o->op_seq = op_seqmax++;
a0d0e21e
LW		 4845 if (dowarn && o->op_next && o->op_next->op_type == OP_NEXTSTATE) {
4846 if (o->op_next->op_sibling &&
4847 o->op_next->op_sibling->op_type != OP_DIE) {
4848 line_t oldline = curcop->cop_line;
4849
4850 curcop->cop_line = ((COP*)o->op_next)->cop_line;
4851 warn("Statement unlikely to be reached");
4852 warn("(Maybe you meant system() when you said exec()?)\n");
4853 curcop->cop_line = oldline;
4854 }
4855 }
4856 break;
aeea060c 4857
c750a3ec
MB		 4858 case OP_HELEM: {
4859 UNOP *rop;
4860 SV *lexname;
4861 GV **fields;
4862 SV **svp, **indsvp;
4863 I32 ind;
4864 char *key;
4865 STRLEN keylen;
aeea060c 4866
c750a3ec
MB		 4867 if (o->op_private & (OPpDEREF_HV|OPpDEREF_AV|OPpLVAL_INTRO)
4868 || ((BINOP*)o)->op_last->op_type != OP_CONST)
4869 break;
4870 rop = (UNOP*)((BINOP*)o)->op_first;
4871 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
4872 break;
4873 lexname = *av_fetch(comppad_name, rop->op_first->op_targ, TRUE);
4874 if (!SvOBJECT(lexname))
4875 break;
5196be3e 4876 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
c750a3ec
MB		 4877 if (!fields || !GvHV(*fields))
4878 break;
4879 svp = &((SVOP*)((BINOP*)o)->op_last)->op_sv;
4880 key = SvPV(*svp, keylen);
4881 indsvp = hv_fetch(GvHV(*fields), key, keylen, FALSE);
4882 if (!indsvp) {
4883 croak("No such field \"%s\" in variable %s of type %s",
4884 key, SvPV(lexname, na), HvNAME(SvSTASH(lexname)));
4885 }
4886 ind = SvIV(*indsvp);
4887 if (ind < 1)
4888 croak("Bad index while coercing array into hash");
4889 rop->op_type = OP_RV2AV;
4890 rop->op_ppaddr = ppaddr[OP_RV2AV];
4891 o->op_type = OP_AELEM;
4892 o->op_ppaddr = ppaddr[OP_AELEM];
4893 SvREFCNT_dec(*svp);
4894 *svp = newSViv(ind);
4895 break;
4896 }
4897
79072805 4898 default:
c07a80fd 4899 o->op_seq = op_seqmax++;
79072805
LW		 4900 break;
4901 }
a0d0e21e 4902 oldop = o;
79072805 4903 }
a0d0e21e 4904 LEAVE;
79072805 4905}
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