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Re: SvOPV() or SvPV_nolen() or ...
[perl5.git] / op.c
CommitLineData
a0d0e21e 1/* op.c
79072805 2 *
9607fc9c 3 * Copyright (c) 1991-1997, Larry Wall
79072805
LW		 4 *
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
7 *
a0d0e21e
LW		 8 */
9
10/*
11 * "You see: Mr. Drogo, he married poor Miss Primula Brandybuck. She was
12 * our Mr. Bilbo's first cousin on the mother's side (her mother being the
13 * youngest of the Old Took's daughters); and Mr. Drogo was his second
14 * cousin. So Mr. Frodo is his first *and* second cousin, once removed
15 * either way, as the saying is, if you follow me." --the Gaffer
79072805
LW		 16 */
17
18#include "EXTERN.h"
19#include "perl.h"
20
76e3520e 21#ifdef PERL_OBJECT
22c35a8c 22#define CHECKCALL this->*PL_check
76e3520e 23#else
22c35a8c 24#define CHECKCALL *PL_check
76e3520e
GS		 25#endif
26
e50aee73 27/*
5dc0d613 28 * In the following definition, the ", Nullop" is just to make the compiler
a5f75d66 29 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 30 */
11343788 31#define CHECKOP(type,o) \
3280af22 32 ((PL_op_mask && PL_op_mask[type]) \
5dc0d613 33 ? ( op_free((OP*)o), \
22c35a8c 34 croak("%s trapped by operation mask", PL_op_desc[type]), \
28757baa 35 Nullop ) \
76e3520e 36 : (CHECKCALL[type])((OP*)o))
e50aee73 37
c53d7c7d
HS		 38#define PAD_MAX 999999999
39
76e3520e
GS		 40static bool scalar_mod_type _((OP *o, I32 type));
41#ifndef PERL_OBJECT
11343788 42static I32 list_assignment _((OP *o));
3bc5dc61 43static void bad_type _((I32 n, char *t, char *name, OP *kid));
11343788
MB		 44static OP *modkids _((OP *o, I32 type));
45static OP *no_fh_allowed _((OP *o));
46static OP *scalarboolean _((OP *o));
47static OP *too_few_arguments _((OP *o, char* name));
48static OP *too_many_arguments _((OP *o, char* name));
49static void null _((OP* o));
bbce6d69 50static PADOFFSET pad_findlex _((char* name, PADOFFSET newoff, U32 seq,
155fc61f 51 CV* startcv, I32 cx_ix, I32 saweval));
54b9620d 52static OP *newDEFSVOP _((void));
883ffac3 53static OP *new_logop _((I32 type, I32 flags, OP **firstp, OP **otherp));
bda4119b 54static void simplify_sort _((OP *o));
35cd451c 55static bool is_handle_constructor _((OP *o, I32 argnum));
76e3520e 56#endif
79072805 57
76e3520e 58STATIC char*
8ac85365 59gv_ename(GV *gv)
4633a7c4 60{
2d8e6c8d 61 STRLEN n_a;
4633a7c4 62 SV* tmpsv = sv_newmortal();
46fc3d4c 63 gv_efullname3(tmpsv, gv, Nullch);
2d8e6c8d 64 return SvPV(tmpsv,n_a);
4633a7c4
LW		 65}
66
76e3520e 67STATIC OP *
8ac85365 68no_fh_allowed(OP *o)
79072805 69{
46fc3d4c 70 yyerror(form("Missing comma after first argument to %s function",
22c35a8c 71 PL_op_desc[o->op_type]));
11343788 72 return o;
79072805
LW		 73}
74
76e3520e 75STATIC OP *
8ac85365 76too_few_arguments(OP *o, char *name)
79072805 77{
46fc3d4c 78 yyerror(form("Not enough arguments for %s", name));
11343788 79 return o;
79072805
LW		 80}
81
76e3520e 82STATIC OP *
8ac85365 83too_many_arguments(OP *o, char *name)
79072805 84{
46fc3d4c 85 yyerror(form("Too many arguments for %s", name));
11343788 86 return o;
79072805
LW		 87}
88
76e3520e 89STATIC void
8ac85365 90bad_type(I32 n, char *t, char *name, OP *kid)
8990e307 91{
46fc3d4c 92 yyerror(form("Type of arg %d to %s must be %s (not %s)",
22c35a8c 93 (int)n, name, t, PL_op_desc[kid->op_type]));
8990e307
LW		 94}
95
a0d0e21e 96void
8ac85365 97assertref(OP *o)
a0d0e21e 98{
11343788 99 int type = o->op_type;
136254bc 100 if (type != OP_AELEM && type != OP_HELEM && type != OP_GELEM) {
22c35a8c 101 yyerror(form("Can't use subscript on %s", PL_op_desc[type]));
bde90e66 102 if (type == OP_ENTERSUB || type == OP_RV2HV || type == OP_PADHV) {
9c82454c 103 dTHR;
bde90e66
HS		 104 SV *msg = sv_2mortal(
105 newSVpvf("(Did you mean $ or @ instead of %c?)\n",
106 type == OP_ENTERSUB ? '&' : '%'));
3280af22 107 if (PL_in_eval & 2)
bde90e66 108 warn("%_", msg);
3280af22
NIS		 109 else if (PL_in_eval)
110 sv_catsv(GvSV(PL_errgv), msg);
bde90e66
HS		 111 else
112 PerlIO_write(PerlIO_stderr(), SvPVX(msg), SvCUR(msg));
113 }
a0d0e21e
LW		 114 }
115}
116
79072805
LW		 117/* "register" allocation */
118
119PADOFFSET
8ac85365 120pad_allocmy(char *name)
93a17b20 121{
11343788 122 dTHR;
a0d0e21e
LW		 123 PADOFFSET off;
124 SV *sv;
125
834a4ddd
LW		 126 if (!(
127 isALPHA(name[1]) ||
128 (PL_hints & HINT_UTF8 && (name[1] & 0xc0) == 0xc0) ||
129 name[1] == '_' && (int)strlen(name) > 2))
130 {
46fc3d4c 131 if (!isPRINT(name[1])) {
132 name[3] = '\0';
133 name[2] = toCTRL(name[1]);
134 name[1] = '^';
135 }
a0d0e21e
LW		 136 croak("Can't use global %s in \"my\"",name);
137 }
599cee73 138 if (ckWARN(WARN_UNSAFE) && AvFILLp(PL_comppad_name) >= 0) {
3280af22
NIS		 139 SV **svp = AvARRAY(PL_comppad_name);
140 for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_floor; off--) {
b1cb66bf 141 if ((sv = svp[off])
3280af22 142 && sv != &PL_sv_undef
c53d7c7d 143 && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
b1cb66bf 144 && strEQ(name, SvPVX(sv)))
145 {
599cee73 146 warner(WARN_UNSAFE,
9fbbe825 147 "\"my\" variable %s masks earlier declaration in same %s",
c53d7c7d 148 name, (SvIVX(sv) == PAD_MAX ? "scope" : "statement"));
b1cb66bf 149 break;
150 }
151 }
152 }
a0d0e21e
LW		 153 off = pad_alloc(OP_PADSV, SVs_PADMY);
154 sv = NEWSV(1102,0);
93a17b20
LW		 155 sv_upgrade(sv, SVt_PVNV);
156 sv_setpv(sv, name);
3280af22 157 if (PL_in_my_stash) {
c750a3ec
MB		 158 if (*name != '$')
159 croak("Can't declare class for non-scalar %s in \"my\"",name);
160 SvOBJECT_on(sv);
161 (void)SvUPGRADE(sv, SVt_PVMG);
3280af22
NIS		 162 SvSTASH(sv) = (HV*)SvREFCNT_inc(PL_in_my_stash);
163 PL_sv_objcount++;
c750a3ec 164 }
3280af22 165 av_store(PL_comppad_name, off, sv);
c53d7c7d 166 SvNVX(sv) = (double)PAD_MAX;
8990e307 167 SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
3280af22
NIS		 168 if (!PL_min_intro_pending)
169 PL_min_intro_pending = off;
170 PL_max_intro_pending = off;
93a17b20 171 if (*name == '@')
3280af22 172 av_store(PL_comppad, off, (SV*)newAV());
93a17b20 173 else if (*name == '%')
3280af22
NIS		 174 av_store(PL_comppad, off, (SV*)newHV());
175 SvPADMY_on(PL_curpad[off]);
93a17b20
LW		 176 return off;
177}
178
76e3520e 179STATIC PADOFFSET
155fc61f 180pad_findlex(char *name, PADOFFSET newoff, U32 seq, CV* startcv, I32 cx_ix, I32 saweval)
93a17b20 181{
11343788 182 dTHR;
748a9306 183 CV *cv;
93a17b20
LW		 184 I32 off;
185 SV *sv;
93a17b20 186 register I32 i;
c09156bb 187 register PERL_CONTEXT *cx;
93a17b20 188
748a9306 189 for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
4fdae800 190 AV *curlist = CvPADLIST(cv);
191 SV **svp = av_fetch(curlist, 0, FALSE);
748a9306 192 AV *curname;
4fdae800 193
3280af22 194 if (!svp || *svp == &PL_sv_undef)
4633a7c4 195 continue;
748a9306
LW		 196 curname = (AV*)*svp;
197 svp = AvARRAY(curname);
93965878 198 for (off = AvFILLp(curname); off > 0; off--) {
748a9306 199 if ((sv = svp[off]) &&
3280af22 200 sv != &PL_sv_undef &&
748a9306 201 seq <= SvIVX(sv) &&
13826f2c 202 seq > I_32(SvNVX(sv)) &&
748a9306
LW		 203 strEQ(SvPVX(sv), name))
204 {
5f05dabc 205 I32 depth;
206 AV *oldpad;
207 SV *oldsv;
208
209 depth = CvDEPTH(cv);
210 if (!depth) {
9607fc9c 211 if (newoff) {
212 if (SvFAKE(sv))
213 continue;
4fdae800 214 return 0; /* don't clone from inactive stack frame */
9607fc9c 215 }
5f05dabc 216 depth = 1;
217 }
218 oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
219 oldsv = *av_fetch(oldpad, off, TRUE);
748a9306 220 if (!newoff) { /* Not a mere clone operation. */
9607fc9c 221 SV *namesv = NEWSV(1103,0);
748a9306 222 newoff = pad_alloc(OP_PADSV, SVs_PADMY);
9607fc9c 223 sv_upgrade(namesv, SVt_PVNV);
224 sv_setpv(namesv, name);
3280af22
NIS		 225 av_store(PL_comppad_name, newoff, namesv);
226 SvNVX(namesv) = (double)PL_curcop->cop_seq;
c53d7c7d 227 SvIVX(namesv) = PAD_MAX; /* A ref, intro immediately */
9607fc9c 228 SvFAKE_on(namesv); /* A ref, not a real var */
87671ffc 229 if (SvOBJECT(sv)) { /* A typed var */
3d93dc8b
GS		 230 SvOBJECT_on(namesv);
231 (void)SvUPGRADE(namesv, SVt_PVMG);
87671ffc 232 SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*)SvSTASH(sv));
3d93dc8b
GS		 233 PL_sv_objcount++;
234 }
3280af22 235 if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) {
28757baa 236 /* "It's closures all the way down." */
3280af22 237 CvCLONE_on(PL_compcv);
54310121 238 if (cv == startcv) {
3280af22 239 if (CvANON(PL_compcv))
54310121 240 oldsv = Nullsv; /* no need to keep ref */
241 }
242 else {
28757baa 243 CV *bcv;
244 for (bcv = startcv;
245 bcv && bcv != cv && !CvCLONE(bcv);
6b35e009
GS		 246 bcv = CvOUTSIDE(bcv))
247 {
28757baa 248 if (CvANON(bcv))
249 CvCLONE_on(bcv);
250 else {
6b35e009
GS		 251 if (ckWARN(WARN_CLOSURE)
252 && !CvUNIQUE(bcv) && !CvUNIQUE(cv))
253 {
599cee73 254 warner(WARN_CLOSURE,
44a8e56a 255 "Variable \"%s\" may be unavailable",
28757baa 256 name);
6b35e009 257 }
28757baa 258 break;
259 }
260 }
261 }
262 }
3280af22 263 else if (!CvUNIQUE(PL_compcv)) {
599cee73
PM		 264 if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv))
265 warner(WARN_CLOSURE,
266 "Variable \"%s\" will not stay shared", name);
5f05dabc 267 }
748a9306 268 }
3280af22 269 av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv));
748a9306
LW		 270 return newoff;
271 }
93a17b20
LW		 272 }
273 }
274
275 /* Nothing in current lexical context--try eval's context, if any.
276 * This is necessary to let the perldb get at lexically scoped variables.
277 * XXX This will also probably interact badly with eval tree caching.
278 */
279
748a9306 280 for (i = cx_ix; i >= 0; i--) {
93a17b20 281 cx = &cxstack[i];
6b35e009 282 switch (CxTYPE(cx)) {
93a17b20 283 default:
748a9306
LW		 284 if (i == 0 && saweval) {
285 seq = cxstack[saweval].blk_oldcop->cop_seq;
155fc61f 286 return pad_findlex(name, newoff, seq, PL_main_cv, -1, saweval);
748a9306 287 }
93a17b20
LW		 288 break;
289 case CXt_EVAL:
44a8e56a 290 switch (cx->blk_eval.old_op_type) {
291 case OP_ENTEREVAL:
6b35e009
GS		 292 if (CxREALEVAL(cx))
293 saweval = i;
44a8e56a 294 break;
295 case OP_REQUIRE:
296 /* require must have its own scope */
297 return 0;
298 }
93a17b20
LW		 299 break;
300 case CXt_SUB:
301 if (!saweval)
302 return 0;
303 cv = cx->blk_sub.cv;
3280af22 304 if (PL_debstash && CvSTASH(cv) == PL_debstash) { /* ignore DB'* scope */
748a9306 305 saweval = i; /* so we know where we were called from */
93a17b20 306 continue;
93a17b20 307 }
748a9306 308 seq = cxstack[saweval].blk_oldcop->cop_seq;
155fc61f 309 return pad_findlex(name, newoff, seq, cv, i-1, saweval);
93a17b20
LW		 310 }
311 }
312
748a9306
LW		 313 return 0;
314}
a0d0e21e 315
748a9306 316PADOFFSET
8ac85365 317pad_findmy(char *name)
748a9306 318{
11343788 319 dTHR;
748a9306 320 I32 off;
54310121 321 I32 pendoff = 0;
748a9306 322 SV *sv;
3280af22
NIS		 323 SV **svp = AvARRAY(PL_comppad_name);
324 U32 seq = PL_cop_seqmax;
6b35e009 325 PERL_CONTEXT *cx;
33b8ce05 326 CV *outside;
748a9306 327
11343788
MB		 328#ifdef USE_THREADS
329 /*
330 * Special case to get lexical (and hence per-thread) @_.
331 * XXX I need to find out how to tell at parse-time whether use
332 * of @_ should refer to a lexical (from a sub) or defgv (global
333 * scope and maybe weird sub-ish things like formats). See
334 * startsub in perly.y. It's possible that @_ could be lexical
335 * (at least from subs) even in non-threaded perl.
336 */
337 if (strEQ(name, "@_"))
338 return 0; /* success. (NOT_IN_PAD indicates failure) */
339#endif /* USE_THREADS */
340
748a9306 341 /* The one we're looking for is probably just before comppad_name_fill. */
3280af22 342 for (off = AvFILLp(PL_comppad_name); off > 0; off--) {
a0d0e21e 343 if ((sv = svp[off]) &&
3280af22 344 sv != &PL_sv_undef &&
54310121 345 (!SvIVX(sv) ||
346 (seq <= SvIVX(sv) &&
347 seq > I_32(SvNVX(sv)))) &&
a0d0e21e
LW		 348 strEQ(SvPVX(sv), name))
349 {
54310121 350 if (SvIVX(sv))
351 return (PADOFFSET)off;
352 pendoff = off; /* this pending def. will override import */
a0d0e21e
LW		 353 }
354 }
748a9306 355
33b8ce05
GS		 356 outside = CvOUTSIDE(PL_compcv);
357
358 /* Check if if we're compiling an eval'', and adjust seq to be the
359 * eval's seq number. This depends on eval'' having a non-null
360 * CvOUTSIDE() while it is being compiled. The eval'' itself is
361 * identified by CvUNIQUE being set and CvGV being null. */
362 if (outside && CvUNIQUE(PL_compcv) && !CvGV(PL_compcv) && cxstack_ix >= 0) {
6b35e009
GS		 363 cx = &cxstack[cxstack_ix];
364 if (CxREALEVAL(cx))
365 seq = cx->blk_oldcop->cop_seq;
366 }
367
748a9306 368 /* See if it's in a nested scope */
33b8ce05 369 off = pad_findlex(name, 0, seq, outside, cxstack_ix, 0);
54310121 370 if (off) {
371 /* If there is a pending local definition, this new alias must die */
372 if (pendoff)
3280af22 373 SvIVX(AvARRAY(PL_comppad_name)[off]) = seq;
11343788 374 return off; /* pad_findlex returns 0 for failure...*/
54310121 375 }
11343788 376 return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */
93a17b20
LW		 377}
378
379void
8ac85365 380pad_leavemy(I32 fill)
93a17b20
LW		 381{
382 I32 off;
3280af22 383 SV **svp = AvARRAY(PL_comppad_name);
93a17b20 384 SV *sv;
3280af22
NIS		 385 if (PL_min_intro_pending && fill < PL_min_intro_pending) {
386 for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
387 if ((sv = svp[off]) && sv != &PL_sv_undef)
8990e307
LW		 388 warn("%s never introduced", SvPVX(sv));
389 }
390 }
391 /* "Deintroduce" my variables that are leaving with this scope. */
3280af22 392 for (off = AvFILLp(PL_comppad_name); off > fill; off--) {
c53d7c7d 393 if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == PAD_MAX)
3280af22 394 SvIVX(sv) = PL_cop_seqmax;
93a17b20
LW		 395 }
396}
397
398PADOFFSET
8ac85365 399pad_alloc(I32 optype, U32 tmptype)
79072805 400{
11343788 401 dTHR;
79072805
LW		 402 SV *sv;
403 I32 retval;
404
3280af22 405 if (AvARRAY(PL_comppad) != PL_curpad)
463ee0b2 406 croak("panic: pad_alloc");
3280af22 407 if (PL_pad_reset_pending)
a0d0e21e 408 pad_reset();
ed6116ce 409 if (tmptype & SVs_PADMY) {
79072805 410 do {
3280af22 411 sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
ed6116ce 412 } while (SvPADBUSY(sv)); /* need a fresh one */
3280af22 413 retval = AvFILLp(PL_comppad);
79072805
LW		 414 }
415 else {
3280af22
NIS		 416 SV **names = AvARRAY(PL_comppad_name);
417 SSize_t names_fill = AvFILLp(PL_comppad_name);
bbce6d69 418 for (;;) {
419 /*
420 * "foreach" index vars temporarily become aliases to non-"my"
421 * values. Thus we must skip, not just pad values that are
422 * marked as current pad values, but also those with names.
423 */
3280af22
NIS		 424 if (++PL_padix <= names_fill &&
425 (sv = names[PL_padix]) && sv != &PL_sv_undef)
bbce6d69 426 continue;
3280af22 427 sv = *av_fetch(PL_comppad, PL_padix, TRUE);
bbce6d69 428 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
429 break;
430 }
3280af22 431 retval = PL_padix;
79072805 432 }
8990e307 433 SvFLAGS(sv) |= tmptype;
3280af22 434 PL_curpad = AvARRAY(PL_comppad);
11343788 435#ifdef USE_THREADS
5dc0d613 436 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
533c011a 437 (unsigned long) thr, (unsigned long) PL_curpad,
22c35a8c 438 (long) retval, PL_op_name[optype]));
11343788 439#else
d9bb4600 440 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx alloc %ld for %s\n",
3280af22 441 (unsigned long) PL_curpad,
22c35a8c 442 (long) retval, PL_op_name[optype]));
11343788 443#endif /* USE_THREADS */
79072805
LW		 444 return (PADOFFSET)retval;
445}
446
447SV *
8990e307 448pad_sv(PADOFFSET po)
79072805 449{
11343788
MB		 450 dTHR;
451#ifdef USE_THREADS
5dc0d613 452 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
533c011a 453 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 454#else
79072805 455 if (!po)
463ee0b2 456 croak("panic: pad_sv po");
d9bb4600 457 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx sv %d\n",
3280af22 458 (unsigned long) PL_curpad, po));
11343788 459#endif /* USE_THREADS */
3280af22 460 return PL_curpad[po]; /* eventually we'll turn this into a macro */
79072805
LW		 461}
462
463void
8990e307 464pad_free(PADOFFSET po)
79072805 465{
11343788 466 dTHR;
3280af22 467 if (!PL_curpad)
a0d0e21e 468 return;
3280af22 469 if (AvARRAY(PL_comppad) != PL_curpad)
463ee0b2 470 croak("panic: pad_free curpad");
79072805 471 if (!po)
463ee0b2 472 croak("panic: pad_free po");
11343788 473#ifdef USE_THREADS
5dc0d613 474 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
533c011a 475 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 476#else
d9bb4600 477 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx free %d\n",
3280af22 478 (unsigned long) PL_curpad, po));
11343788 479#endif /* USE_THREADS */
3280af22
NIS		 480 if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef)
481 SvPADTMP_off(PL_curpad[po]);
482 if ((I32)po < PL_padix)
483 PL_padix = po - 1;
79072805
LW		 484}
485
486void
8990e307 487pad_swipe(PADOFFSET po)
79072805 488{
11343788 489 dTHR;
3280af22 490 if (AvARRAY(PL_comppad) != PL_curpad)
463ee0b2 491 croak("panic: pad_swipe curpad");
79072805 492 if (!po)
463ee0b2 493 croak("panic: pad_swipe po");
11343788 494#ifdef USE_THREADS
5dc0d613 495 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
533c011a 496 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 497#else
d9bb4600 498 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx swipe %d\n",
3280af22 499 (unsigned long) PL_curpad, po));
11343788 500#endif /* USE_THREADS */
3280af22
NIS		 501 SvPADTMP_off(PL_curpad[po]);
502 PL_curpad[po] = NEWSV(1107,0);
503 SvPADTMP_on(PL_curpad[po]);
504 if ((I32)po < PL_padix)
505 PL_padix = po - 1;
79072805
LW		 506}
507
d9bb4600
GS		 508/* XXX pad_reset() is currently disabled because it results in serious bugs.
509 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
510 * on the stack by OPs that use them, there are several ways to get an alias
511 * to a shared TARG. Such an alias will change randomly and unpredictably.
512 * We avoid doing this until we can think of a Better Way.
513 * GSAR 97-10-29 */
79072805 514void
8ac85365 515pad_reset(void)
79072805 516{
d9bb4600 517#ifdef USE_BROKEN_PAD_RESET
11343788 518 dTHR;
79072805
LW		 519 register I32 po;
520
6b88bc9c 521 if (AvARRAY(PL_comppad) != PL_curpad)
463ee0b2 522 croak("panic: pad_reset curpad");
11343788 523#ifdef USE_THREADS
5dc0d613 524 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
6b88bc9c 525 (unsigned long) thr, (unsigned long) PL_curpad));
11343788 526#else
d9bb4600 527 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx reset\n",
6b88bc9c 528 (unsigned long) PL_curpad));
11343788 529#endif /* USE_THREADS */
6b88bc9c
GS		 530 if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */
531 for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
532 if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
533 SvPADTMP_off(PL_curpad[po]);
748a9306 534 }
6b88bc9c 535 PL_padix = PL_padix_floor;
79072805 536 }
d9bb4600 537#endif
3280af22 538 PL_pad_reset_pending = FALSE;
79072805
LW		 539}
540
a863c7d1 541#ifdef USE_THREADS
54b9620d 542/* find_threadsv is not reentrant */
a863c7d1 543PADOFFSET
54b9620d 544find_threadsv(char *name)
a863c7d1
MB		 545{
546 dTHR;
547 char *p;
548 PADOFFSET key;
554b3eca 549 SV **svp;
54b9620d 550 /* We currently only handle names of a single character */
533c011a 551 p = strchr(PL_threadsv_names, *name);
a863c7d1
MB		 552 if (!p)
553 return NOT_IN_PAD;
533c011a 554 key = p - PL_threadsv_names;
2d8e6c8d 555 MUTEX_LOCK(&thr->mutex);
54b9620d 556 svp = av_fetch(thr->threadsv, key, FALSE);
2d8e6c8d
GS		 557 if (svp)
558 MUTEX_UNLOCK(&thr->mutex);
559 else {
554b3eca 560 SV *sv = NEWSV(0, 0);
54b9620d 561 av_store(thr->threadsv, key, sv);
940cb80d 562 thr->threadsvp = AvARRAY(thr->threadsv);
2d8e6c8d 563 MUTEX_UNLOCK(&thr->mutex);
554b3eca
MB		 564 /*
565 * Some magic variables used to be automagically initialised
566 * in gv_fetchpv. Those which are now per-thread magicals get
567 * initialised here instead.
568 */
569 switch (*name) {
54b9620d
MB		 570 case '_':
571 break;
554b3eca
MB		 572 case ';':
573 sv_setpv(sv, "\034");
54b9620d 574 sv_magic(sv, 0, 0, name, 1);
554b3eca 575 break;
c277df42
IZ		 576 case '&':
577 case '`':
578 case '\'':
533c011a 579 PL_sawampersand = TRUE;
a3f914c5
GS		 580 /* FALL THROUGH */
581 case '1':
582 case '2':
583 case '3':
584 case '4':
585 case '5':
586 case '6':
587 case '7':
588 case '8':
589 case '9':
c277df42 590 SvREADONLY_on(sv);
d8b5173a 591 /* FALL THROUGH */
067391ea
GS		 592
593 /* XXX %! tied to Errno.pm needs to be added here.
594 * See gv_fetchpv(). */
595 /* case '!': */
596
54b9620d
MB		 597 default:
598 sv_magic(sv, 0, 0, name, 1);
554b3eca 599 }
8b73bbec 600 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
54b9620d 601 "find_threadsv: new SV %p for $%s%c\n",
554b3eca
MB		 602 sv, (*name < 32) ? "^" : "",
603 (*name < 32) ? toCTRL(*name) : *name));
a863c7d1
MB		 604 }
605 return key;
606}
607#endif /* USE_THREADS */
608
79072805
LW		 609/* Destructor */
610
611void
8ac85365 612op_free(OP *o)
79072805 613{
85e6fe83 614 register OP *kid, *nextkid;
79072805 615
5dc0d613 616 if (!o || o->op_seq == (U16)-1)
79072805
LW		 617 return;
618
11343788
MB		 619 if (o->op_flags & OPf_KIDS) {
620 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 621 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 622 op_free(kid);
85e6fe83 623 }
79072805
LW		 624 }
625
11343788 626 switch (o->op_type) {
8990e307 627 case OP_NULL:
11343788 628 o->op_targ = 0; /* Was holding old type, if any. */
8990e307 629 break;
a0d0e21e 630 case OP_ENTEREVAL:
11343788 631 o->op_targ = 0; /* Was holding hints. */
a0d0e21e 632 break;
554b3eca 633#ifdef USE_THREADS
8dd3ba40
SM		 634 case OP_ENTERITER:
635 if (!(o->op_flags & OPf_SPECIAL))
636 break;
637 /* FALL THROUGH */
2faa37cc 638 case OP_THREADSV:
54b9620d 639 o->op_targ = 0; /* Was holding index into thr->threadsv AV. */
554b3eca
MB		 640 break;
641#endif /* USE_THREADS */
a6006777 642 default:
ac4c12e7 643 if (!(o->op_flags & OPf_REF)
22c35a8c 644 || (PL_check[o->op_type] != FUNC_NAME_TO_PTR(ck_ftst)))
a6006777 645 break;
646 /* FALL THROUGH */
463ee0b2 647 case OP_GVSV:
79072805 648 case OP_GV:
a6006777 649 case OP_AELEMFAST:
11343788 650 SvREFCNT_dec(cGVOPo->op_gv);
8990e307
LW		 651 break;
652 case OP_NEXTSTATE:
653 case OP_DBSTATE:
5196be3e 654 Safefree(cCOPo->cop_label);
11343788 655 SvREFCNT_dec(cCOPo->cop_filegv);
599cee73
PM		 656 if (cCOPo->cop_warnings != WARN_NONE && cCOPo->cop_warnings != WARN_ALL)
657 SvREFCNT_dec(cCOPo->cop_warnings);
79072805
LW		 658 break;
659 case OP_CONST:
11343788 660 SvREFCNT_dec(cSVOPo->op_sv);
79072805 661 break;
748a9306
LW		 662 case OP_GOTO:
663 case OP_NEXT:
664 case OP_LAST:
665 case OP_REDO:
11343788 666 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 667 break;
668 /* FALL THROUGH */
a0d0e21e 669 case OP_TRANS:
a0ed51b3
LW		 670 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF))
671 SvREFCNT_dec(cSVOPo->op_sv);
672 else
673 Safefree(cPVOPo->op_pv);
a0d0e21e
LW		 674 break;
675 case OP_SUBST:
11343788 676 op_free(cPMOPo->op_pmreplroot);
a0d0e21e 677 /* FALL THROUGH */
748a9306 678 case OP_PUSHRE:
a0d0e21e 679 case OP_MATCH:
8782bef2 680 case OP_QR:
c277df42 681 ReREFCNT_dec(cPMOPo->op_pmregexp);
a0d0e21e 682 break;
79072805
LW		 683 }
684
11343788
MB		 685 if (o->op_targ > 0)
686 pad_free(o->op_targ);
8990e307 687
11343788 688 Safefree(o);
79072805
LW		 689}
690
76e3520e 691STATIC void
8ac85365 692null(OP *o)
8990e307 693{
54b9620d 694 if (o->op_type != OP_NULL && o->op_type != OP_THREADSV && o->op_targ > 0)
11343788
MB		 695 pad_free(o->op_targ);
696 o->op_targ = o->op_type;
697 o->op_type = OP_NULL;
22c35a8c 698 o->op_ppaddr = PL_ppaddr[OP_NULL];
8990e307
LW		 699}
700
79072805
LW		 701/* Contextualizers */
702
463ee0b2 703#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 704
705OP *
8ac85365 706linklist(OP *o)
79072805
LW		 707{
708 register OP *kid;
709
11343788
MB		 710 if (o->op_next)
711 return o->op_next;
79072805
LW		 712
713 /* establish postfix order */
11343788
MB		 714 if (cUNOPo->op_first) {
715 o->op_next = LINKLIST(cUNOPo->op_first);
716 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 717 if (kid->op_sibling)
718 kid->op_next = LINKLIST(kid->op_sibling);
719 else
11343788 720 kid->op_next = o;
79072805
LW		 721 }
722 }
723 else
11343788 724 o->op_next = o;
79072805 725
11343788 726 return o->op_next;
79072805
LW		 727}
728
729OP *
8ac85365 730scalarkids(OP *o)
79072805
LW		 731{
732 OP *kid;
11343788
MB		 733 if (o && o->op_flags & OPf_KIDS) {
734 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 735 scalar(kid);
736 }
11343788 737 return o;
79072805
LW		 738}
739
76e3520e 740STATIC OP *
8ac85365 741scalarboolean(OP *o)
8990e307 742{
d008e5eb 743 if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
0f15f207 744 dTHR;
d008e5eb
GS		 745 if (ckWARN(WARN_SYNTAX)) {
746 line_t oldline = PL_curcop->cop_line;
a0d0e21e 747
d008e5eb
GS		 748 if (PL_copline != NOLINE)
749 PL_curcop->cop_line = PL_copline;
750 warner(WARN_SYNTAX, "Found = in conditional, should be ==");
751 PL_curcop->cop_line = oldline;
752 }
a0d0e21e 753 }
11343788 754 return scalar(o);
8990e307
LW		 755}
756
757OP *
8ac85365 758scalar(OP *o)
79072805
LW		 759{
760 OP *kid;
761
a0d0e21e 762 /* assumes no premature commitment */
3280af22 763 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 764 || o->op_type == OP_RETURN)
11343788 765 return o;
79072805 766
5dc0d613 767 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 768
11343788 769 switch (o->op_type) {
79072805 770 case OP_REPEAT:
11343788
MB		 771 if (o->op_private & OPpREPEAT_DOLIST)
772 null(((LISTOP*)cBINOPo->op_first)->op_first);
773 scalar(cBINOPo->op_first);
8990e307 774 break;
79072805
LW		 775 case OP_OR:
776 case OP_AND:
777 case OP_COND_EXPR:
11343788 778 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 779 scalar(kid);
79072805 780 break;
a0d0e21e 781 case OP_SPLIT:
11343788 782 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 783 if (!kPMOP->op_pmreplroot)
784 deprecate("implicit split to @_");
785 }
786 /* FALL THROUGH */
79072805 787 case OP_MATCH:
8782bef2 788 case OP_QR:
79072805
LW		 789 case OP_SUBST:
790 case OP_NULL:
8990e307 791 default:
11343788
MB		 792 if (o->op_flags & OPf_KIDS) {
793 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 794 scalar(kid);
795 }
79072805
LW		 796 break;
797 case OP_LEAVE:
798 case OP_LEAVETRY:
5dc0d613 799 kid = cLISTOPo->op_first;
54310121 800 scalar(kid);
801 while (kid = kid->op_sibling) {
802 if (kid->op_sibling)
803 scalarvoid(kid);
804 else
805 scalar(kid);
806 }
3280af22 807 WITH_THR(PL_curcop = &PL_compiling);
54310121 808 break;
748a9306 809 case OP_SCOPE:
79072805 810 case OP_LINESEQ:
8990e307 811 case OP_LIST:
11343788 812 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 813 if (kid->op_sibling)
814 scalarvoid(kid);
815 else
816 scalar(kid);
817 }
3280af22 818 WITH_THR(PL_curcop = &PL_compiling);
79072805
LW		 819 break;
820 }
11343788 821 return o;
79072805
LW		 822}
823
824OP *
8ac85365 825scalarvoid(OP *o)
79072805
LW		 826{
827 OP *kid;
8990e307
LW		 828 char* useless = 0;
829 SV* sv;
79072805 830
54310121 831 /* assumes no premature commitment */
68c73484
JH		 832 U8 want = o->op_flags & OPf_WANT;
833 if (!o || (want && want != OPf_WANT_SCALAR) || PL_error_count
5dc0d613 834 || o->op_type == OP_RETURN)
11343788 835 return o;
79072805 836
5dc0d613 837 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 838
11343788 839 switch (o->op_type) {
79072805 840 default:
22c35a8c 841 if (!(PL_opargs[o->op_type] & OA_FOLDCONST))
8990e307 842 break;
36477c24 843 /* FALL THROUGH */
844 case OP_REPEAT:
11343788 845 if (o->op_flags & OPf_STACKED)
8990e307 846 break;
5d82c453
GA		 847 goto func_ops;
848 case OP_SUBSTR:
849 if (o->op_private == 4)
850 break;
8990e307
LW		 851 /* FALL THROUGH */
852 case OP_GVSV:
853 case OP_WANTARRAY:
854 case OP_GV:
855 case OP_PADSV:
856 case OP_PADAV:
857 case OP_PADHV:
858 case OP_PADANY:
859 case OP_AV2ARYLEN:
8990e307 860 case OP_REF:
a0d0e21e
LW		 861 case OP_REFGEN:
862 case OP_SREFGEN:
8990e307
LW		 863 case OP_DEFINED:
864 case OP_HEX:
865 case OP_OCT:
866 case OP_LENGTH:
8990e307
LW		 867 case OP_VEC:
868 case OP_INDEX:
869 case OP_RINDEX:
870 case OP_SPRINTF:
871 case OP_AELEM:
872 case OP_AELEMFAST:
873 case OP_ASLICE:
8990e307
LW		 874 case OP_HELEM:
875 case OP_HSLICE:
876 case OP_UNPACK:
877 case OP_PACK:
8990e307
LW		 878 case OP_JOIN:
879 case OP_LSLICE:
880 case OP_ANONLIST:
881 case OP_ANONHASH:
882 case OP_SORT:
883 case OP_REVERSE:
884 case OP_RANGE:
885 case OP_FLIP:
886 case OP_FLOP:
887 case OP_CALLER:
888 case OP_FILENO:
889 case OP_EOF:
890 case OP_TELL:
891 case OP_GETSOCKNAME:
892 case OP_GETPEERNAME:
893 case OP_READLINK:
894 case OP_TELLDIR:
895 case OP_GETPPID:
896 case OP_GETPGRP:
897 case OP_GETPRIORITY:
898 case OP_TIME:
899 case OP_TMS:
900 case OP_LOCALTIME:
901 case OP_GMTIME:
902 case OP_GHBYNAME:
903 case OP_GHBYADDR:
904 case OP_GHOSTENT:
905 case OP_GNBYNAME:
906 case OP_GNBYADDR:
907 case OP_GNETENT:
908 case OP_GPBYNAME:
909 case OP_GPBYNUMBER:
910 case OP_GPROTOENT:
911 case OP_GSBYNAME:
912 case OP_GSBYPORT:
913 case OP_GSERVENT:
914 case OP_GPWNAM:
915 case OP_GPWUID:
916 case OP_GGRNAM:
917 case OP_GGRGID:
918 case OP_GETLOGIN:
5d82c453 919 func_ops:
11343788 920 if (!(o->op_private & OPpLVAL_INTRO))
22c35a8c 921 useless = PL_op_desc[o->op_type];
8990e307
LW		 922 break;
923
924 case OP_RV2GV:
925 case OP_RV2SV:
926 case OP_RV2AV:
927 case OP_RV2HV:
11343788
MB		 928 if (!(o->op_private & OPpLVAL_INTRO) &&
929 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 930 useless = "a variable";
931 break;
79072805 932
93a17b20 933 case OP_NEXTSTATE:
8990e307 934 case OP_DBSTATE:
3280af22 935 WITH_THR(PL_curcop = ((COP*)o)); /* for warning below */
93a17b20
LW		 936 break;
937
79072805 938 case OP_CONST:
11343788 939 sv = cSVOPo->op_sv;
d008e5eb
GS		 940 {
941 dTHR;
942 if (ckWARN(WARN_VOID)) {
943 useless = "a constant";
944 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
945 useless = 0;
946 else if (SvPOK(sv)) {
947 if (strnEQ(SvPVX(sv), "di", 2) ||
948 strnEQ(SvPVX(sv), "ds", 2) ||
949 strnEQ(SvPVX(sv), "ig", 2))
950 useless = 0;
951 }
8990e307
LW		 952 }
953 }
11343788 954 null(o); /* don't execute a constant */
8990e307 955 SvREFCNT_dec(sv); /* don't even remember it */
79072805
LW		 956 break;
957
958 case OP_POSTINC:
11343788 959 o->op_type = OP_PREINC; /* pre-increment is faster */
22c35a8c 960 o->op_ppaddr = PL_ppaddr[OP_PREINC];
79072805
LW		 961 break;
962
963 case OP_POSTDEC:
11343788 964 o->op_type = OP_PREDEC; /* pre-decrement is faster */
22c35a8c 965 o->op_ppaddr = PL_ppaddr[OP_PREDEC];
79072805
LW		 966 break;
967
79072805
LW		 968 case OP_OR:
969 case OP_AND:
970 case OP_COND_EXPR:
11343788 971 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 972 scalarvoid(kid);
973 break;
5aabfad6 974
a0d0e21e 975 case OP_NULL:
11343788 976 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
3280af22 977 WITH_THR(PL_curcop = ((COP*)o)); /* for warning below */
11343788 978 if (o->op_flags & OPf_STACKED)
a0d0e21e 979 break;
5aabfad6 980 /* FALL THROUGH */
79072805
LW		 981 case OP_ENTERTRY:
982 case OP_ENTER:
983 case OP_SCALAR:
11343788 984 if (!(o->op_flags & OPf_KIDS))
79072805 985 break;
54310121 986 /* FALL THROUGH */
463ee0b2 987 case OP_SCOPE:
79072805
LW		 988 case OP_LEAVE:
989 case OP_LEAVETRY:
a0d0e21e 990 case OP_LEAVELOOP:
79072805 991 case OP_LINESEQ:
79072805 992 case OP_LIST:
11343788 993 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 994 scalarvoid(kid);
995 break;
c90c0ff4 996 case OP_ENTEREVAL:
5196be3e 997 scalarkids(o);
c90c0ff4 998 break;
5aabfad6 999 case OP_REQUIRE:
c90c0ff4 1000 /* all requires must return a boolean value */
5196be3e
MB		 1001 o->op_flags &= ~OPf_WANT;
1002 return scalar(o);
a0d0e21e 1003 case OP_SPLIT:
11343788 1004 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 1005 if (!kPMOP->op_pmreplroot)
1006 deprecate("implicit split to @_");
1007 }
1008 break;
79072805 1009 }
d008e5eb
GS		 1010 if (useless) {
1011 dTHR;
1012 if (ckWARN(WARN_VOID))
1013 warner(WARN_VOID, "Useless use of %s in void context", useless);
1014 }
11343788 1015 return o;
79072805
LW		 1016}
1017
1018OP *
8ac85365 1019listkids(OP *o)
79072805
LW		 1020{
1021 OP *kid;
11343788
MB		 1022 if (o && o->op_flags & OPf_KIDS) {
1023 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 1024 list(kid);
1025 }
11343788 1026 return o;
79072805
LW		 1027}
1028
1029OP *
8ac85365 1030list(OP *o)
79072805
LW		 1031{
1032 OP *kid;
1033
a0d0e21e 1034 /* assumes no premature commitment */
3280af22 1035 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 1036 || o->op_type == OP_RETURN)
11343788 1037 return o;
79072805 1038
5dc0d613 1039 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 1040
11343788 1041 switch (o->op_type) {
79072805
LW		 1042 case OP_FLOP:
1043 case OP_REPEAT:
11343788 1044 list(cBINOPo->op_first);
79072805
LW		 1045 break;
1046 case OP_OR:
1047 case OP_AND:
1048 case OP_COND_EXPR:
11343788 1049 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1050 list(kid);
1051 break;
1052 default:
1053 case OP_MATCH:
8782bef2 1054 case OP_QR:
79072805
LW		 1055 case OP_SUBST:
1056 case OP_NULL:
11343788 1057 if (!(o->op_flags & OPf_KIDS))
79072805 1058 break;
11343788
MB		 1059 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
1060 list(cBINOPo->op_first);
1061 return gen_constant_list(o);
79072805
LW		 1062 }
1063 case OP_LIST:
11343788 1064 listkids(o);
79072805
LW		 1065 break;
1066 case OP_LEAVE:
1067 case OP_LEAVETRY:
5dc0d613 1068 kid = cLISTOPo->op_first;
54310121 1069 list(kid);
1070 while (kid = kid->op_sibling) {
1071 if (kid->op_sibling)
1072 scalarvoid(kid);
1073 else
1074 list(kid);
1075 }
3280af22 1076 WITH_THR(PL_curcop = &PL_compiling);
54310121 1077 break;
748a9306 1078 case OP_SCOPE:
79072805 1079 case OP_LINESEQ:
11343788 1080 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 1081 if (kid->op_sibling)
1082 scalarvoid(kid);
1083 else
1084 list(kid);
1085 }
3280af22 1086 WITH_THR(PL_curcop = &PL_compiling);
79072805 1087 break;
c90c0ff4 1088 case OP_REQUIRE:
1089 /* all requires must return a boolean value */
5196be3e
MB		 1090 o->op_flags &= ~OPf_WANT;
1091 return scalar(o);
79072805 1092 }
11343788 1093 return o;
79072805
LW		 1094}
1095
1096OP *
8ac85365 1097scalarseq(OP *o)
79072805
LW		 1098{
1099 OP *kid;
1100
11343788
MB		 1101 if (o) {
1102 if (o->op_type == OP_LINESEQ ||
1103 o->op_type == OP_SCOPE ||
1104 o->op_type == OP_LEAVE ||
1105 o->op_type == OP_LEAVETRY)
463ee0b2 1106 {
0f15f207 1107 dTHR;
11343788 1108 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1109 if (kid->op_sibling) {
463ee0b2 1110 scalarvoid(kid);
ed6116ce 1111 }
463ee0b2 1112 }
3280af22 1113 PL_curcop = &PL_compiling;
79072805 1114 }
11343788 1115 o->op_flags &= ~OPf_PARENS;
3280af22 1116 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 1117 o->op_flags |= OPf_PARENS;
79072805 1118 }
8990e307 1119 else
11343788
MB		 1120 o = newOP(OP_STUB, 0);
1121 return o;
79072805
LW		 1122}
1123
76e3520e 1124STATIC OP *
8ac85365 1125modkids(OP *o, I32 type)
79072805
LW		 1126{
1127 OP *kid;
11343788
MB		 1128 if (o && o->op_flags & OPf_KIDS) {
1129 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1130 mod(kid, type);
79072805 1131 }
11343788 1132 return o;
79072805
LW		 1133}
1134
79072805 1135OP *
8ac85365 1136mod(OP *o, I32 type)
79072805 1137{
11343788 1138 dTHR;
79072805
LW		 1139 OP *kid;
1140 SV *sv;
2d8e6c8d 1141 STRLEN n_a;
79072805 1142
3280af22 1143 if (!o || PL_error_count)
11343788 1144 return o;
79072805 1145
11343788 1146 switch (o->op_type) {
68dc0745 1147 case OP_UNDEF:
3280af22 1148 PL_modcount++;
5dc0d613 1149 return o;
a0d0e21e 1150 case OP_CONST:
11343788 1151 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e 1152 goto nomod;
3280af22
NIS		 1153 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
1154 PL_compiling.cop_arybase = (I32)SvIV(((SVOP*)PL_eval_start)->op_sv);
1155 PL_eval_start = 0;
a0d0e21e
LW		 1156 }
1157 else if (!type) {
3280af22
NIS		 1158 SAVEI32(PL_compiling.cop_arybase);
1159 PL_compiling.cop_arybase = 0;
a0d0e21e
LW		 1160 }
1161 else if (type == OP_REFGEN)
1162 goto nomod;
1163 else
1164 croak("That use of $[ is unsupported");
1165 break;
5f05dabc 1166 case OP_STUB:
5196be3e 1167 if (o->op_flags & OPf_PARENS)
5f05dabc 1168 break;
1169 goto nomod;
a0d0e21e
LW		 1170 case OP_ENTERSUB:
1171 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1172 !(o->op_flags & OPf_STACKED)) {
1173 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1174 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1175 assert(cUNOPo->op_first->op_type == OP_NULL);
1176 null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1177 break;
1178 }
1179 /* FALL THROUGH */
1180 default:
a0d0e21e
LW		 1181 nomod:
1182 /* grep, foreach, subcalls, refgen */
1183 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1184 break;
46fc3d4c 1185 yyerror(form("Can't modify %s in %s",
638bc118 1186 (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
22c35a8c
GS		 1187 ? "do block" : PL_op_desc[o->op_type]),
1188 type ? PL_op_desc[type] : "local"));
11343788 1189 return o;
79072805 1190
a0d0e21e
LW		 1191 case OP_PREINC:
1192 case OP_PREDEC:
1193 case OP_POW:
1194 case OP_MULTIPLY:
1195 case OP_DIVIDE:
1196 case OP_MODULO:
1197 case OP_REPEAT:
1198 case OP_ADD:
1199 case OP_SUBTRACT:
1200 case OP_CONCAT:
1201 case OP_LEFT_SHIFT:
1202 case OP_RIGHT_SHIFT:
1203 case OP_BIT_AND:
1204 case OP_BIT_XOR:
1205 case OP_BIT_OR:
1206 case OP_I_MULTIPLY:
1207 case OP_I_DIVIDE:
1208 case OP_I_MODULO:
1209 case OP_I_ADD:
1210 case OP_I_SUBTRACT:
11343788 1211 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1212 goto nomod;
3280af22 1213 PL_modcount++;
a0d0e21e
LW		 1214 break;
1215
79072805 1216 case OP_COND_EXPR:
11343788 1217 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1218 mod(kid, type);
79072805
LW		 1219 break;
1220
1221 case OP_RV2AV:
1222 case OP_RV2HV:
93af7a87 1223 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1224 croak("Can't localize through a reference");
11343788 1225 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
3280af22 1226 PL_modcount = 10000;
11343788 1227 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1228 }
1229 /* FALL THROUGH */
79072805 1230 case OP_RV2GV:
5dc0d613 1231 if (scalar_mod_type(o, type))
3fe9a6f1 1232 goto nomod;
11343788 1233 ref(cUNOPo->op_first, o->op_type);
79072805
LW		 1234 /* FALL THROUGH */
1235 case OP_AASSIGN:
1236 case OP_ASLICE:
1237 case OP_HSLICE:
93a17b20
LW		 1238 case OP_NEXTSTATE:
1239 case OP_DBSTATE:
a0d0e21e
LW		 1240 case OP_REFGEN:
1241 case OP_CHOMP:
3280af22 1242 PL_modcount = 10000;
79072805 1243 break;
463ee0b2 1244 case OP_RV2SV:
11343788 1245 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1246 croak("Can't localize through a reference");
aeea060c 1247 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1248 /* FALL THROUGH */
79072805 1249 case OP_GV:
463ee0b2 1250 case OP_AV2ARYLEN:
3280af22 1251 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1252 case OP_SASSIGN:
bf4b1e52
GS		 1253 case OP_ANDASSIGN:
1254 case OP_ORASSIGN:
8990e307 1255 case OP_AELEMFAST:
3280af22 1256 PL_modcount++;
8990e307
LW		 1257 break;
1258
748a9306
LW		 1259 case OP_PADAV:
1260 case OP_PADHV:
3280af22 1261 PL_modcount = 10000;
5196be3e
MB		 1262 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1263 return o; /* Treat \(@foo) like ordinary list. */
1264 if (scalar_mod_type(o, type))
3fe9a6f1 1265 goto nomod;
748a9306
LW		 1266 /* FALL THROUGH */
1267 case OP_PADSV:
3280af22 1268 PL_modcount++;
748a9306
LW		 1269 if (!type)
1270 croak("Can't localize lexical variable %s",
2d8e6c8d 1271 SvPV(*av_fetch(PL_comppad_name, o->op_targ, 4), n_a));
463ee0b2
LW		 1272 break;
1273
554b3eca 1274#ifdef USE_THREADS
2faa37cc 1275 case OP_THREADSV:
533c011a 1276 PL_modcount++; /* XXX ??? */
554b3eca
MB		 1277 break;
1278#endif /* USE_THREADS */
1279
748a9306
LW		 1280 case OP_PUSHMARK:
1281 break;
a0d0e21e 1282
69969c6f
SB		 1283 case OP_KEYS:
1284 if (type != OP_SASSIGN)
1285 goto nomod;
5d82c453
GA		 1286 goto lvalue_func;
1287 case OP_SUBSTR:
1288 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1289 goto nomod;
5f05dabc 1290 /* FALL THROUGH */
a0d0e21e 1291 case OP_POS:
463ee0b2 1292 case OP_VEC:
5d82c453 1293 lvalue_func:
11343788
MB		 1294 pad_free(o->op_targ);
1295 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1296 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1297 if (o->op_flags & OPf_KIDS)
1298 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1299 break;
a0d0e21e 1300
463ee0b2
LW		 1301 case OP_AELEM:
1302 case OP_HELEM:
11343788 1303 ref(cBINOPo->op_first, o->op_type);
68dc0745 1304 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1305 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1306 o->op_private |= OPpLVAL_DEFER;
3280af22 1307 PL_modcount++;
463ee0b2
LW		 1308 break;
1309
1310 case OP_SCOPE:
1311 case OP_LEAVE:
1312 case OP_ENTER:
11343788
MB		 1313 if (o->op_flags & OPf_KIDS)
1314 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1315 break;
1316
1317 case OP_NULL:
638bc118
GS		 1318 if (o->op_flags & OPf_SPECIAL) /* do BLOCK */
1319 goto nomod;
1320 else if (!(o->op_flags & OPf_KIDS))
463ee0b2 1321 break;
11343788
MB		 1322 if (o->op_targ != OP_LIST) {
1323 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1324 break;
1325 }
1326 /* FALL THROUGH */
463ee0b2 1327 case OP_LIST:
11343788 1328 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1329 mod(kid, type);
1330 break;
1331 }
11343788 1332 o->op_flags |= OPf_MOD;
a0d0e21e
LW		 1333
1334 if (type == OP_AASSIGN || type == OP_SASSIGN)
11343788 1335 o->op_flags |= OPf_SPECIAL|OPf_REF;
a0d0e21e 1336 else if (!type) {
11343788
MB		 1337 o->op_private |= OPpLVAL_INTRO;
1338 o->op_flags &= ~OPf_SPECIAL;
3280af22 1339 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1340 }
a0d0e21e 1341 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
11343788
MB		 1342 o->op_flags |= OPf_REF;
1343 return o;
463ee0b2
LW		 1344}
1345
3fe9a6f1 1346static bool
8ac85365 1347scalar_mod_type(OP *o, I32 type)
3fe9a6f1 1348{
1349 switch (type) {
1350 case OP_SASSIGN:
5196be3e 1351 if (o->op_type == OP_RV2GV)
3fe9a6f1 1352 return FALSE;
1353 /* FALL THROUGH */
1354 case OP_PREINC:
1355 case OP_PREDEC:
1356 case OP_POSTINC:
1357 case OP_POSTDEC:
1358 case OP_I_PREINC:
1359 case OP_I_PREDEC:
1360 case OP_I_POSTINC:
1361 case OP_I_POSTDEC:
1362 case OP_POW:
1363 case OP_MULTIPLY:
1364 case OP_DIVIDE:
1365 case OP_MODULO:
1366 case OP_REPEAT:
1367 case OP_ADD:
1368 case OP_SUBTRACT:
1369 case OP_I_MULTIPLY:
1370 case OP_I_DIVIDE:
1371 case OP_I_MODULO:
1372 case OP_I_ADD:
1373 case OP_I_SUBTRACT:
1374 case OP_LEFT_SHIFT:
1375 case OP_RIGHT_SHIFT:
1376 case OP_BIT_AND:
1377 case OP_BIT_XOR:
1378 case OP_BIT_OR:
1379 case OP_CONCAT:
1380 case OP_SUBST:
1381 case OP_TRANS:
49e9fbe6
GS		 1382 case OP_READ:
1383 case OP_SYSREAD:
1384 case OP_RECV:
bf4b1e52
GS		 1385 case OP_ANDASSIGN:
1386 case OP_ORASSIGN:
3fe9a6f1 1387 return TRUE;
1388 default:
1389 return FALSE;
1390 }
1391}
1392
35cd451c
GS		 1393STATIC bool
1394is_handle_constructor(OP *o, I32 argnum)
1395{
1396 switch (o->op_type) {
1397 case OP_PIPE_OP:
1398 case OP_SOCKPAIR:
1399 if (argnum == 2)
1400 return TRUE;
1401 /* FALL THROUGH */
1402 case OP_SYSOPEN:
1403 case OP_OPEN:
1404 case OP_SOCKET:
1405 case OP_OPEN_DIR:
1406 case OP_ACCEPT:
1407 if (argnum == 1)
1408 return TRUE;
1409 /* FALL THROUGH */
1410 default:
1411 return FALSE;
1412 }
1413}
1414
463ee0b2 1415OP *
8ac85365 1416refkids(OP *o, I32 type)
463ee0b2
LW		 1417{
1418 OP *kid;
11343788
MB		 1419 if (o && o->op_flags & OPf_KIDS) {
1420 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1421 ref(kid, type);
1422 }
11343788 1423 return o;
463ee0b2
LW		 1424}
1425
1426OP *
8ac85365 1427ref(OP *o, I32 type)
463ee0b2
LW		 1428{
1429 OP *kid;
463ee0b2 1430
3280af22 1431 if (!o || PL_error_count)
11343788 1432 return o;
463ee0b2 1433
11343788 1434 switch (o->op_type) {
a0d0e21e 1435 case OP_ENTERSUB:
e55aaa0e 1436 if ((type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1437 !(o->op_flags & OPf_STACKED)) {
1438 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1439 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1440 assert(cUNOPo->op_first->op_type == OP_NULL);
1441 null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
1442 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1443 }
1444 break;
aeea060c 1445
463ee0b2 1446 case OP_COND_EXPR:
11343788 1447 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1448 ref(kid, type);
1449 break;
8990e307 1450 case OP_RV2SV:
35cd451c
GS		 1451 if (type == OP_DEFINED)
1452 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1453 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1454 /* FALL THROUGH */
1455 case OP_PADSV:
5f05dabc 1456 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1457 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1458 : type == OP_RV2HV ? OPpDEREF_HV
1459 : OPpDEREF_SV);
11343788 1460 o->op_flags |= OPf_MOD;
a0d0e21e 1461 }
8990e307
LW		 1462 break;
1463
2faa37cc 1464 case OP_THREADSV:
a863c7d1
MB		 1465 o->op_flags |= OPf_MOD; /* XXX ??? */
1466 break;
1467
463ee0b2
LW		 1468 case OP_RV2AV:
1469 case OP_RV2HV:
aeea060c 1470 o->op_flags |= OPf_REF;
8990e307 1471 /* FALL THROUGH */
463ee0b2 1472 case OP_RV2GV:
35cd451c
GS		 1473 if (type == OP_DEFINED)
1474 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1475 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1476 break;
8990e307 1477
463ee0b2
LW		 1478 case OP_PADAV:
1479 case OP_PADHV:
aeea060c 1480 o->op_flags |= OPf_REF;
79072805 1481 break;
aeea060c 1482
8990e307 1483 case OP_SCALAR:
79072805 1484 case OP_NULL:
11343788 1485 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1486 break;
11343788 1487 ref(cBINOPo->op_first, type);
79072805
LW		 1488 break;
1489 case OP_AELEM:
1490 case OP_HELEM:
11343788 1491 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1492 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1493 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1494 : type == OP_RV2HV ? OPpDEREF_HV
1495 : OPpDEREF_SV);
11343788 1496 o->op_flags |= OPf_MOD;
8990e307 1497 }
79072805
LW		 1498 break;
1499
463ee0b2 1500 case OP_SCOPE:
79072805
LW		 1501 case OP_LEAVE:
1502 case OP_ENTER:
8990e307 1503 case OP_LIST:
11343788 1504 if (!(o->op_flags & OPf_KIDS))
79072805 1505 break;
11343788 1506 ref(cLISTOPo->op_last, type);
79072805 1507 break;
a0d0e21e
LW		 1508 default:
1509 break;
79072805 1510 }
11343788 1511 return scalar(o);
8990e307 1512
79072805
LW		 1513}
1514
1515OP *
8ac85365 1516my(OP *o)
93a17b20
LW		 1517{
1518 OP *kid;
93a17b20
LW		 1519 I32 type;
1520
3280af22 1521 if (!o || PL_error_count)
11343788 1522 return o;
93a17b20 1523
11343788 1524 type = o->op_type;
93a17b20 1525 if (type == OP_LIST) {
11343788 1526 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
93a17b20 1527 my(kid);
dab48698 1528 } else if (type == OP_UNDEF) {
7766148a 1529 return o;
dab48698 1530 } else if (type != OP_PADSV &&
93a17b20
LW		 1531 type != OP_PADAV &&
1532 type != OP_PADHV &&
1533 type != OP_PUSHMARK)
1534 {
22c35a8c 1535 yyerror(form("Can't declare %s in my", PL_op_desc[o->op_type]));
11343788 1536 return o;
93a17b20 1537 }
11343788
MB		 1538 o->op_flags |= OPf_MOD;
1539 o->op_private |= OPpLVAL_INTRO;
1540 return o;
93a17b20
LW		 1541}
1542
1543OP *
8ac85365 1544sawparens(OP *o)
79072805
LW		 1545{
1546 if (o)
1547 o->op_flags |= OPf_PARENS;
1548 return o;
1549}
1550
1551OP *
8ac85365 1552bind_match(I32 type, OP *left, OP *right)
79072805 1553{
d008e5eb 1554 dTHR;
11343788 1555 OP *o;
79072805 1556
599cee73
PM		 1557 if (ckWARN(WARN_UNSAFE) &&
1558 (left->op_type == OP_RV2AV ||
1559 left->op_type == OP_RV2HV ||
1560 left->op_type == OP_PADAV ||
1561 left->op_type == OP_PADHV)) {
22c35a8c 1562 char *desc = PL_op_desc[(right->op_type == OP_SUBST ||
599cee73
PM		 1563 right->op_type == OP_TRANS)
1564 ? right->op_type : OP_MATCH];
1565 char *sample = ((left->op_type == OP_RV2AV ||
1566 left->op_type == OP_PADAV)
1567 ? "@array" : "%hash");
1568 warner(WARN_UNSAFE,
1569 "Applying %s to %s will act on scalar(%s)",
1570 desc, sample, sample);
2ae324a7 1571 }
1572
79072805
LW		 1573 if (right->op_type == OP_MATCH ||
1574 right->op_type == OP_SUBST ||
1575 right->op_type == OP_TRANS) {
1576 right->op_flags |= OPf_STACKED;
1577 if (right->op_type != OP_MATCH)
463ee0b2 1578 left = mod(left, right->op_type);
79072805 1579 if (right->op_type == OP_TRANS)
11343788 1580 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1581 else
11343788 1582 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1583 if (type == OP_NOT)
11343788
MB		 1584 return newUNOP(OP_NOT, 0, scalar(o));
1585 return o;
79072805
LW		 1586 }
1587 else
1588 return bind_match(type, left,
1589 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1590}
1591
1592OP *
8ac85365 1593invert(OP *o)
79072805 1594{
11343788
MB		 1595 if (!o)
1596 return o;
79072805 1597 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1598 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1599}
1600
1601OP *
8ac85365 1602scope(OP *o)
79072805
LW		 1603{
1604 if (o) {
3280af22 1605 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1606 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1607 o->op_type = OP_LEAVE;
22c35a8c 1608 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2
LW		 1609 }
1610 else {
1611 if (o->op_type == OP_LINESEQ) {
1612 OP *kid;
1613 o->op_type = OP_SCOPE;
22c35a8c 1614 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
463ee0b2 1615 kid = ((LISTOP*)o)->op_first;
748a9306
LW		 1616 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
1617 SvREFCNT_dec(((COP*)kid)->cop_filegv);
8990e307 1618 null(kid);
748a9306 1619 }
463ee0b2
LW		 1620 }
1621 else
748a9306 1622 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1623 }
79072805
LW		 1624 }
1625 return o;
1626}
1627
b3ac6de7
IZ		 1628void
1629save_hints(void)
1630{
3280af22
NIS		 1631 SAVEI32(PL_hints);
1632 SAVESPTR(GvHV(PL_hintgv));
1633 GvHV(PL_hintgv) = newHVhv(GvHV(PL_hintgv));
1634 SAVEFREESV(GvHV(PL_hintgv));
b3ac6de7
IZ		 1635}
1636
a0d0e21e 1637int
8ac85365 1638block_start(int full)
79072805 1639{
11343788 1640 dTHR;
3280af22 1641 int retval = PL_savestack_ix;
b3ac6de7 1642
3280af22 1643 SAVEI32(PL_comppad_name_floor);
55497cff 1644 if (full) {
3280af22
NIS		 1645 if ((PL_comppad_name_fill = AvFILLp(PL_comppad_name)) > 0)
1646 PL_comppad_name_floor = PL_comppad_name_fill;
55497cff 1647 else
3280af22
NIS		 1648 PL_comppad_name_floor = 0;
1649 }
1650 SAVEI32(PL_min_intro_pending);
1651 SAVEI32(PL_max_intro_pending);
1652 PL_min_intro_pending = 0;
1653 SAVEI32(PL_comppad_name_fill);
1654 SAVEI32(PL_padix_floor);
1655 PL_padix_floor = PL_padix;
1656 PL_pad_reset_pending = FALSE;
b3ac6de7 1657 SAVEHINTS();
3280af22 1658 PL_hints &= ~HINT_BLOCK_SCOPE;
e24b16f9 1659 SAVEPPTR(PL_compiling.cop_warnings);
599cee73
PM		 1660 if (PL_compiling.cop_warnings != WARN_ALL &&
1661 PL_compiling.cop_warnings != WARN_NONE) {
1662 PL_compiling.cop_warnings = newSVsv(PL_compiling.cop_warnings) ;
1663 SAVEFREESV(PL_compiling.cop_warnings) ;
1664 }
1665
1666
a0d0e21e
LW		 1667 return retval;
1668}
1669
1670OP*
8ac85365 1671block_end(I32 floor, OP *seq)
a0d0e21e 1672{
11343788 1673 dTHR;
3280af22 1674 int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
a0d0e21e 1675 OP* retval = scalarseq(seq);
a0d0e21e 1676 LEAVE_SCOPE(floor);
3280af22 1677 PL_pad_reset_pending = FALSE;
e24b16f9 1678 PL_compiling.op_private = PL_hints;
a0d0e21e 1679 if (needblockscope)
3280af22
NIS		 1680 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
1681 pad_leavemy(PL_comppad_name_fill);
1682 PL_cop_seqmax++;
a0d0e21e
LW		 1683 return retval;
1684}
1685
76e3520e 1686STATIC OP *
54b9620d
MB		 1687newDEFSVOP(void)
1688{
1689#ifdef USE_THREADS
1690 OP *o = newOP(OP_THREADSV, 0);
1691 o->op_targ = find_threadsv("_");
1692 return o;
1693#else
3280af22 1694 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
54b9620d
MB		 1695#endif /* USE_THREADS */
1696}
1697
a0d0e21e 1698void
8ac85365 1699newPROG(OP *o)
a0d0e21e 1700{
11343788 1701 dTHR;
3280af22
NIS		 1702 if (PL_in_eval) {
1703 PL_eval_root = newUNOP(OP_LEAVEEVAL, ((PL_in_eval & 4) ? OPf_SPECIAL : 0), o);
1704 PL_eval_start = linklist(PL_eval_root);
1705 PL_eval_root->op_next = 0;
1706 peep(PL_eval_start);
a0d0e21e
LW		 1707 }
1708 else {
5dc0d613 1709 if (!o)
a0d0e21e 1710 return;
3280af22
NIS		 1711 PL_main_root = scope(sawparens(scalarvoid(o)));
1712 PL_curcop = &PL_compiling;
1713 PL_main_start = LINKLIST(PL_main_root);
1714 PL_main_root->op_next = 0;
1715 peep(PL_main_start);
1716 PL_compcv = 0;
3841441e 1717
4fdae800 1718 /* Register with debugger */
84902520 1719 if (PERLDB_INTER) {
3841441e 1720 CV *cv = perl_get_cv("DB::postponed", FALSE);
3841441e
CS		 1721 if (cv) {
1722 dSP;
924508f0 1723 PUSHMARK(SP);
3280af22 1724 XPUSHs((SV*)PL_compiling.cop_filegv);
3841441e
CS		 1725 PUTBACK;
1726 perl_call_sv((SV*)cv, G_DISCARD);
1727 }
1728 }
79072805 1729 }
79072805
LW		 1730}
1731
1732OP *
8ac85365 1733localize(OP *o, I32 lex)
79072805
LW		 1734{
1735 if (o->op_flags & OPf_PARENS)
1736 list(o);
8990e307 1737 else {
d008e5eb 1738 dTHR;
599cee73 1739 if (ckWARN(WARN_PARENTHESIS) && PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ',') {
8990e307 1740 char *s;
834a4ddd 1741 for (s = PL_bufptr; *s && (isALNUM(*s) || (*s & 0x80) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1742 if (*s == ';' || *s == '=')
752ebe84 1743 warner(WARN_PARENTHESIS, "Parentheses missing around \"%s\" list",
599cee73 1744 lex ? "my" : "local");
8990e307
LW		 1745 }
1746 }
3280af22
NIS		 1747 PL_in_my = FALSE;
1748 PL_in_my_stash = Nullhv;
93a17b20
LW		 1749 if (lex)
1750 return my(o);
1751 else
463ee0b2 1752 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 1753}
1754
1755OP *
8ac85365 1756jmaybe(OP *o)
79072805
LW		 1757{
1758 if (o->op_type == OP_LIST) {
554b3eca
MB		 1759 OP *o2;
1760#ifdef USE_THREADS
2faa37cc 1761 o2 = newOP(OP_THREADSV, 0);
54b9620d 1762 o2->op_targ = find_threadsv(";");
554b3eca
MB		 1763#else
1764 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
1765#endif /* USE_THREADS */
1766 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 1767 }
1768 return o;
1769}
1770
1771OP *
8ac85365 1772fold_constants(register OP *o)
79072805 1773{
11343788 1774 dTHR;
79072805
LW		 1775 register OP *curop;
1776 I32 type = o->op_type;
748a9306 1777 SV *sv;
79072805 1778
22c35a8c 1779 if (PL_opargs[type] & OA_RETSCALAR)
79072805 1780 scalar(o);
22c35a8c 1781 if (PL_opargs[type] & OA_TARGET)
ed6116ce 1782 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1783
22c35a8c
GS		 1784 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER))
1785 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
85e6fe83 1786
22c35a8c 1787 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 1788 goto nope;
1789
de939608
CS		 1790 switch (type) {
1791 case OP_SPRINTF:
1792 case OP_UCFIRST:
1793 case OP_LCFIRST:
1794 case OP_UC:
1795 case OP_LC:
69dcf70c
MB		 1796 case OP_SLT:
1797 case OP_SGT:
1798 case OP_SLE:
1799 case OP_SGE:
1800 case OP_SCMP:
1801
de939608
CS		 1802 if (o->op_private & OPpLOCALE)
1803 goto nope;
1804 }
1805
3280af22 1806 if (PL_error_count)
a0d0e21e
LW		 1807 goto nope; /* Don't try to run w/ errors */
1808
79072805 1809 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
93a17b20
LW		 1810 if (curop->op_type != OP_CONST &&
1811 curop->op_type != OP_LIST &&
1812 curop->op_type != OP_SCALAR &&
a0d0e21e 1813 curop->op_type != OP_NULL &&
93a17b20 1814 curop->op_type != OP_PUSHMARK) {
79072805
LW		 1815 goto nope;
1816 }
1817 }
1818
1819 curop = LINKLIST(o);
1820 o->op_next = 0;
533c011a 1821 PL_op = curop;
76e3520e 1822 CALLRUNOPS();
3280af22 1823 sv = *(PL_stack_sp--);
748a9306 1824 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 1825 pad_swipe(o->op_targ);
748a9306
LW		 1826 else if (SvTEMP(sv)) { /* grab mortal temp? */
1827 (void)SvREFCNT_inc(sv);
1828 SvTEMP_off(sv);
85e6fe83 1829 }
79072805
LW		 1830 op_free(o);
1831 if (type == OP_RV2GV)
b1cb66bf 1832 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306 1833 else {
ee580363
GS		 1834 /* try to smush double to int, but don't smush -2.0 to -2 */
1835 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK &&
1836 type != OP_NEGATE)
1837 {
748a9306 1838 IV iv = SvIV(sv);
ee580363 1839 if ((double)iv == SvNV(sv)) {
748a9306
LW		 1840 SvREFCNT_dec(sv);
1841 sv = newSViv(iv);
1842 }
b1cb66bf 1843 else
1844 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 1845 }
1846 return newSVOP(OP_CONST, 0, sv);
1847 }
aeea060c 1848
79072805 1849 nope:
22c35a8c 1850 if (!(PL_opargs[type] & OA_OTHERINT))
79072805 1851 return o;
79072805 1852
3280af22 1853 if (!(PL_hints & HINT_INTEGER)) {
a0d0e21e 1854 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 1855 return o;
1856
1857 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
1858 if (curop->op_type == OP_CONST) {
b1cb66bf 1859 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 1860 continue;
1861 return o;
1862 }
22c35a8c 1863 if (PL_opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 1864 continue;
1865 return o;
1866 }
22c35a8c 1867 o->op_ppaddr = PL_ppaddr[++(o->op_type)];
79072805
LW		 1868 }
1869
79072805
LW		 1870 return o;
1871}
1872
1873OP *
8ac85365 1874gen_constant_list(register OP *o)
79072805 1875{
11343788 1876 dTHR;
79072805 1877 register OP *curop;
3280af22 1878 I32 oldtmps_floor = PL_tmps_floor;
79072805 1879
a0d0e21e 1880 list(o);
3280af22 1881 if (PL_error_count)
a0d0e21e
LW		 1882 return o; /* Don't attempt to run with errors */
1883
533c011a 1884 PL_op = curop = LINKLIST(o);
a0d0e21e 1885 o->op_next = 0;
11343788 1886 pp_pushmark(ARGS);
76e3520e 1887 CALLRUNOPS();
533c011a 1888 PL_op = curop;
11343788 1889 pp_anonlist(ARGS);
3280af22 1890 PL_tmps_floor = oldtmps_floor;
79072805
LW		 1891
1892 o->op_type = OP_RV2AV;
22c35a8c 1893 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 1894 curop = ((UNOP*)o)->op_first;
3280af22 1895 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*PL_stack_sp--));
79072805 1896 op_free(curop);
79072805
LW		 1897 linklist(o);
1898 return list(o);
1899}
1900
1901OP *
8ac85365 1902convert(I32 type, I32 flags, OP *o)
79072805
LW		 1903{
1904 OP *kid;
a0d0e21e 1905 OP *last = 0;
79072805 1906
11343788
MB		 1907 if (!o || o->op_type != OP_LIST)
1908 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 1909 else
5dc0d613 1910 o->op_flags &= ~OPf_WANT;
79072805 1911
22c35a8c 1912 if (!(PL_opargs[type] & OA_MARK))
11343788 1913 null(cLISTOPo->op_first);
8990e307 1914
11343788 1915 o->op_type = type;
22c35a8c 1916 o->op_ppaddr = PL_ppaddr[type];
11343788 1917 o->op_flags |= flags;
79072805 1918
11343788
MB		 1919 o = CHECKOP(type, o);
1920 if (o->op_type != type)
1921 return o;
79072805 1922
11343788 1923 if (cLISTOPo->op_children < 7) {
79072805 1924 /* XXX do we really need to do this if we're done appending?? */
11343788 1925 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805 1926 last = kid;
11343788 1927 cLISTOPo->op_last = last; /* in case check substituted last arg */
79072805
LW		 1928 }
1929
11343788 1930 return fold_constants(o);
79072805
LW		 1931}
1932
1933/* List constructors */
1934
1935OP *
8ac85365 1936append_elem(I32 type, OP *first, OP *last)
79072805
LW		 1937{
1938 if (!first)
1939 return last;
8990e307
LW		 1940
1941 if (!last)
79072805 1942 return first;
8990e307 1943
a0d0e21e
LW		 1944 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
1945 return newLISTOP(type, 0, first, last);
79072805 1946
a0d0e21e
LW		 1947 if (first->op_flags & OPf_KIDS)
1948 ((LISTOP*)first)->op_last->op_sibling = last;
1949 else {
1950 first->op_flags |= OPf_KIDS;
1951 ((LISTOP*)first)->op_first = last;
1952 }
1953 ((LISTOP*)first)->op_last = last;
1954 ((LISTOP*)first)->op_children++;
1955 return first;
79072805
LW		 1956}
1957
1958OP *
8ac85365 1959append_list(I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 1960{
1961 if (!first)
1962 return (OP*)last;
8990e307
LW		 1963
1964 if (!last)
79072805 1965 return (OP*)first;
8990e307
LW		 1966
1967 if (first->op_type != type)
79072805 1968 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 1969
1970 if (last->op_type != type)
79072805
LW		 1971 return append_elem(type, (OP*)first, (OP*)last);
1972
1973 first->op_last->op_sibling = last->op_first;
1974 first->op_last = last->op_last;
1975 first->op_children += last->op_children;
1976 if (first->op_children)
acb74605 1977 first->op_flags |= OPf_KIDS;
79072805
LW		 1978
1979 Safefree(last);
1980 return (OP*)first;
1981}
1982
1983OP *
8ac85365 1984prepend_elem(I32 type, OP *first, OP *last)
79072805
LW		 1985{
1986 if (!first)
1987 return last;
8990e307
LW		 1988
1989 if (!last)
79072805 1990 return first;
8990e307
LW		 1991
1992 if (last->op_type == type) {
1993 if (type == OP_LIST) { /* already a PUSHMARK there */
1994 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
1995 ((LISTOP*)last)->op_first->op_sibling = first;
1996 }
1997 else {
1998 if (!(last->op_flags & OPf_KIDS)) {
1999 ((LISTOP*)last)->op_last = first;
2000 last->op_flags |= OPf_KIDS;
2001 }
2002 first->op_sibling = ((LISTOP*)last)->op_first;
2003 ((LISTOP*)last)->op_first = first;
79072805 2004 }
79072805
LW		 2005 ((LISTOP*)last)->op_children++;
2006 return last;
2007 }
2008
2009 return newLISTOP(type, 0, first, last);
2010}
2011
2012/* Constructors */
2013
2014OP *
8ac85365 2015newNULLLIST(void)
79072805 2016{
8990e307
LW		 2017 return newOP(OP_STUB, 0);
2018}
2019
2020OP *
8ac85365 2021force_list(OP *o)
8990e307 2022{
11343788
MB		 2023 if (!o || o->op_type != OP_LIST)
2024 o = newLISTOP(OP_LIST, 0, o, Nullop);
2025 null(o);
2026 return o;
79072805
LW		 2027}
2028
2029OP *
8ac85365 2030newLISTOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2031{
2032 LISTOP *listop;
2033
2034 Newz(1101, listop, 1, LISTOP);
2035
2036 listop->op_type = type;
22c35a8c 2037 listop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2038 listop->op_children = (first != 0) + (last != 0);
2039 listop->op_flags = flags;
79072805
LW		 2040
2041 if (!last && first)
2042 last = first;
2043 else if (!first && last)
2044 first = last;
8990e307
LW		 2045 else if (first)
2046 first->op_sibling = last;
79072805
LW		 2047 listop->op_first = first;
2048 listop->op_last = last;
8990e307
LW		 2049 if (type == OP_LIST) {
2050 OP* pushop;
2051 pushop = newOP(OP_PUSHMARK, 0);
2052 pushop->op_sibling = first;
2053 listop->op_first = pushop;
2054 listop->op_flags |= OPf_KIDS;
2055 if (!last)
2056 listop->op_last = pushop;
2057 }
2058 else if (listop->op_children)
2059 listop->op_flags |= OPf_KIDS;
79072805
LW		 2060
2061 return (OP*)listop;
2062}
2063
2064OP *
8ac85365 2065newOP(I32 type, I32 flags)
79072805 2066{
11343788
MB		 2067 OP *o;
2068 Newz(1101, o, 1, OP);
2069 o->op_type = type;
22c35a8c 2070 o->op_ppaddr = PL_ppaddr[type];
11343788 2071 o->op_flags = flags;
79072805 2072
11343788
MB		 2073 o->op_next = o;
2074 o->op_private = 0 + (flags >> 8);
22c35a8c 2075 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2076 scalar(o);
22c35a8c 2077 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2078 o->op_targ = pad_alloc(type, SVs_PADTMP);
2079 return CHECKOP(type, o);
79072805
LW		 2080}
2081
2082OP *
8ac85365 2083newUNOP(I32 type, I32 flags, OP *first)
79072805
LW		 2084{
2085 UNOP *unop;
2086
93a17b20 2087 if (!first)
aeea060c 2088 first = newOP(OP_STUB, 0);
22c35a8c 2089 if (PL_opargs[type] & OA_MARK)
8990e307 2090 first = force_list(first);
93a17b20 2091
79072805
LW		 2092 Newz(1101, unop, 1, UNOP);
2093 unop->op_type = type;
22c35a8c 2094 unop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2095 unop->op_first = first;
2096 unop->op_flags = flags | OPf_KIDS;
c07a80fd 2097 unop->op_private = 1 | (flags >> 8);
e50aee73 2098 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2099 if (unop->op_next)
2100 return (OP*)unop;
2101
a0d0e21e 2102 return fold_constants((OP *) unop);
79072805
LW		 2103}
2104
2105OP *
8ac85365 2106newBINOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2107{
2108 BINOP *binop;
2109 Newz(1101, binop, 1, BINOP);
2110
2111 if (!first)
2112 first = newOP(OP_NULL, 0);
2113
2114 binop->op_type = type;
22c35a8c 2115 binop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2116 binop->op_first = first;
2117 binop->op_flags = flags | OPf_KIDS;
2118 if (!last) {
2119 last = first;
c07a80fd 2120 binop->op_private = 1 | (flags >> 8);
79072805
LW		 2121 }
2122 else {
c07a80fd 2123 binop->op_private = 2 | (flags >> 8);
79072805
LW		 2124 first->op_sibling = last;
2125 }
2126
e50aee73 2127 binop = (BINOP*)CHECKOP(type, binop);
79072805
LW		 2128 if (binop->op_next)
2129 return (OP*)binop;
2130
7284ab6f 2131 binop->op_last = binop->op_first->op_sibling;
79072805 2132
a0d0e21e 2133 return fold_constants((OP *)binop);
79072805
LW		 2134}
2135
a0ed51b3
LW		 2136static int
2137utf8compare(const void *a, const void *b)
2138{
2139 int i;
2140 for (i = 0; i < 10; i++) {
2141 if ((*(U8**)a)[i] < (*(U8**)b)[i])
2142 return -1;
2143 if ((*(U8**)a)[i] > (*(U8**)b)[i])
2144 return 1;
2145 }
2146 return 0;
2147}
2148
79072805 2149OP *
8ac85365 2150pmtrans(OP *o, OP *expr, OP *repl)
79072805 2151{
79072805
LW		 2152 SV *tstr = ((SVOP*)expr)->op_sv;
2153 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2154 STRLEN tlen;
2155 STRLEN rlen;
ec49126f 2156 register U8 *t = (U8*)SvPV(tstr, tlen);
2157 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 2158 register I32 i;
2159 register I32 j;
a0ed51b3 2160 I32 del;
79072805 2161 I32 complement;
5d06d08e 2162 I32 squash;
79072805
LW		 2163 register short *tbl;
2164
11343788 2165 complement = o->op_private & OPpTRANS_COMPLEMENT;
a0ed51b3 2166 del = o->op_private & OPpTRANS_DELETE;
5d06d08e 2167 squash = o->op_private & OPpTRANS_SQUASH;
79072805 2168
a0ed51b3
LW		 2169 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
2170 SV* listsv = newSVpv("# comment\n",0);
2171 SV* transv = 0;
2172 U8* tend = t + tlen;
2173 U8* rend = r + rlen;
2174 I32 ulen;
2175 U32 tfirst = 1;
2176 U32 tlast = 0;
2177 I32 tdiff;
2178 U32 rfirst = 1;
2179 U32 rlast = 0;
2180 I32 rdiff;
2181 I32 diff;
2182 I32 none = 0;
2183 U32 max = 0;
2184 I32 bits;
2185 I32 grows = 0;
2186 I32 havefinal = 0;
2187 U32 final;
2188 HV *hv;
2189 I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2190 I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
2191
2192 if (complement) {
2193 U8 tmpbuf[10];
2194 U8** cp;
2195 UV nextmin = 0;
2196 New(1109, cp, tlen, U8*);
2197 i = 0;
2198 transv = newSVpv("",0);
2199 while (t < tend) {
2200 cp[i++] = t;
2201 t += UTF8SKIP(t);
2202 if (*t == 0xff) {
2203 t++;
2204 t += UTF8SKIP(t);
2205 }
2206 }
2207 qsort(cp, i, sizeof(U8*), utf8compare);
2208 for (j = 0; j < i; j++) {
2209 U8 *s = cp[j];
2210 UV val = utf8_to_uv(s, &ulen);
2211 s += ulen;
2212 diff = val - nextmin;
2213 if (diff > 0) {
2214 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2215 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2216 if (diff > 1) {
2217 t = uv_to_utf8(tmpbuf, val - 1);
2218 sv_catpvn(transv, "\377", 1);
dfe13c55 2219 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2220 }
2221 }
2222 if (*s == 0xff)
2223 val = utf8_to_uv(s+1, &ulen);
2224 if (val >= nextmin)
2225 nextmin = val + 1;
2226 }
2227 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2228 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2229 t = uv_to_utf8(tmpbuf, 0x7fffffff);
2230 sv_catpvn(transv, "\377", 1);
dfe13c55
GS		 2231 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2232 t = (U8*)SvPVX(transv);
a0ed51b3
LW		 2233 tlen = SvCUR(transv);
2234 tend = t + tlen;
2235 }
2236 else if (!rlen && !del) {
2237 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2238 }
2239 if (!squash) {
2240 if (to_utf && from_utf) { /* only counting characters */
2241 if (t == r || (tlen == rlen && memEQ(t, r, tlen)))
2242 o->op_private |= OPpTRANS_IDENTICAL;
2243 }
2244 else { /* straight latin-1 translation */
2245 if (tlen == 4 && memEQ(t, "\0\377\303\277", 4) &&
2246 rlen == 4 && memEQ(r, "\0\377\303\277", 4))
2247 o->op_private |= OPpTRANS_IDENTICAL;
2248 }
a0ed51b3
LW		 2249 }
2250
2251 while (t < tend || tfirst <= tlast) {
2252 /* see if we need more "t" chars */
2253 if (tfirst > tlast) {
2254 tfirst = (I32)utf8_to_uv(t, &ulen);
2255 t += ulen;
2256 if (t < tend && *t == 0xff) { /* illegal utf8 val indicates range */
2257 tlast = (I32)utf8_to_uv(++t, &ulen);
2258 t += ulen;
2259 }
2260 else
2261 tlast = tfirst;
2262 }
2263
2264 /* now see if we need more "r" chars */
2265 if (rfirst > rlast) {
2266 if (r < rend) {
2267 rfirst = (I32)utf8_to_uv(r, &ulen);
2268 r += ulen;
2269 if (r < rend && *r == 0xff) { /* illegal utf8 val indicates range */
2270 rlast = (I32)utf8_to_uv(++r, &ulen);
2271 r += ulen;
2272 }
2273 else
2274 rlast = rfirst;
2275 }
2276 else {
2277 if (!havefinal++)
2278 final = rlast;
2279 rfirst = rlast = 0xffffffff;
2280 }
2281 }
2282
2283 /* now see which range will peter our first, if either. */
2284 tdiff = tlast - tfirst;
2285 rdiff = rlast - rfirst;
2286
2287 if (tdiff <= rdiff)
2288 diff = tdiff;
2289 else
2290 diff = rdiff;
2291
2292 if (rfirst == 0xffffffff) {
2293 diff = tdiff; /* oops, pretend rdiff is infinite */
2294 if (diff > 0)
2295 sv_catpvf(listsv, "%04x\t%04x\tXXXX\n", tfirst, tlast);
2296 else
2297 sv_catpvf(listsv, "%04x\t\tXXXX\n", tfirst);
2298 }
2299 else {
2300 if (diff > 0)
2301 sv_catpvf(listsv, "%04x\t%04x\t%04x\n", tfirst, tfirst + diff, rfirst);
2302 else
2303 sv_catpvf(listsv, "%04x\t\t%04x\n", tfirst, rfirst);
2304
2305 if (rfirst + diff > max)
2306 max = rfirst + diff;
2307 rfirst += diff + 1;
2308 if (!grows) {
2309 if (rfirst <= 0x80)
2310 ;
2311 else if (rfirst <= 0x800)
2312 grows |= (tfirst < 0x80);
2313 else if (rfirst <= 0x10000)
2314 grows |= (tfirst < 0x800);
2315 else if (rfirst <= 0x200000)
2316 grows |= (tfirst < 0x10000);
2317 else if (rfirst <= 0x4000000)
2318 grows |= (tfirst < 0x200000);
2319 else if (rfirst <= 0x80000000)
2320 grows |= (tfirst < 0x4000000);
2321 }
2322 }
2323 tfirst += diff + 1;
2324 }
2325
2326 none = ++max;
2327 if (del)
2328 del = ++max;
2329
2330 if (max > 0xffff)
2331 bits = 32;
2332 else if (max > 0xff)
2333 bits = 16;
2334 else
2335 bits = 8;
2336
2337 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2338 SvREFCNT_dec(listsv);
2339 if (transv)
2340 SvREFCNT_dec(transv);
2341
2342 if (!del && havefinal)
2343 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5, newSViv((IV)final), 0);
2344
2345 if (grows && to_utf)
2346 o->op_private |= OPpTRANS_GROWS;
2347
2348 op_free(expr);
2349 op_free(repl);
2350 return o;
2351 }
2352
2353 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 2354 if (complement) {
2355 Zero(tbl, 256, short);
2356 for (i = 0; i < tlen; i++)
ec49126f 2357 tbl[t[i]] = -1;
79072805
LW		 2358 for (i = 0, j = 0; i < 256; i++) {
2359 if (!tbl[i]) {
2360 if (j >= rlen) {
a0ed51b3 2361 if (del)
79072805
LW		 2362 tbl[i] = -2;
2363 else if (rlen)
ec49126f 2364 tbl[i] = r[j-1];
79072805
LW		 2365 else
2366 tbl[i] = i;
2367 }
2368 else
ec49126f 2369 tbl[i] = r[j++];
79072805
LW		 2370 }
2371 }
2372 }
2373 else {
a0ed51b3 2374 if (!rlen && !del) {
79072805 2375 r = t; rlen = tlen;
5d06d08e 2376 if (!squash)
4757a243 2377 o->op_private |= OPpTRANS_IDENTICAL;
79072805
LW		 2378 }
2379 for (i = 0; i < 256; i++)
2380 tbl[i] = -1;
2381 for (i = 0, j = 0; i < tlen; i++,j++) {
2382 if (j >= rlen) {
a0ed51b3 2383 if (del) {
ec49126f 2384 if (tbl[t[i]] == -1)
2385 tbl[t[i]] = -2;
79072805
LW		 2386 continue;
2387 }
2388 --j;
2389 }
ec49126f 2390 if (tbl[t[i]] == -1)
2391 tbl[t[i]] = r[j];
79072805
LW		 2392 }
2393 }
2394 op_free(expr);
2395 op_free(repl);
2396
11343788 2397 return o;
79072805
LW		 2398}
2399
2400OP *
8ac85365 2401newPMOP(I32 type, I32 flags)
79072805 2402{
11343788 2403 dTHR;
79072805
LW		 2404 PMOP *pmop;
2405
2406 Newz(1101, pmop, 1, PMOP);
2407 pmop->op_type = type;
22c35a8c 2408 pmop->op_ppaddr = PL_ppaddr[type];
79072805 2409 pmop->op_flags = flags;
c07a80fd 2410 pmop->op_private = 0 | (flags >> 8);
79072805 2411
3280af22 2412 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 2413 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 2414 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 2415 pmop->op_pmpermflags |= PMf_LOCALE;
2416 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2417
79072805 2418 /* link into pm list */
3280af22
NIS		 2419 if (type != OP_TRANS && PL_curstash) {
2420 pmop->op_pmnext = HvPMROOT(PL_curstash);
2421 HvPMROOT(PL_curstash) = pmop;
79072805
LW		 2422 }
2423
2424 return (OP*)pmop;
2425}
2426
2427OP *
8ac85365 2428pmruntime(OP *o, OP *expr, OP *repl)
79072805 2429{
5c0ca799 2430 dTHR;
79072805
LW		 2431 PMOP *pm;
2432 LOGOP *rcop;
ce862d02 2433 I32 repl_has_vars = 0;
79072805 2434
11343788
MB		 2435 if (o->op_type == OP_TRANS)
2436 return pmtrans(o, expr, repl);
79072805 2437
3280af22 2438 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2439 pm = (PMOP*)o;
79072805
LW		 2440
2441 if (expr->op_type == OP_CONST) {
463ee0b2 2442 STRLEN plen;
79072805 2443 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2444 char *p = SvPV(pat, plen);
11343788 2445 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2446 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2447 p = SvPV(pat, plen);
79072805
LW		 2448 pm->op_pmflags |= PMf_SKIPWHITE;
2449 }
15e52e56 2450 pm->op_pmregexp = CALLREGCOMP(p, p + plen, pm);
aeea060c 2451 if (strEQ("\\s+", pm->op_pmregexp->precomp))
85e6fe83 2452 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2453 op_free(expr);
2454 }
2455 else {
3280af22
NIS		 2456 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
2457 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2458 ? OP_REGCRESET
2459 : OP_REGCMAYBE),0,expr);
463ee0b2 2460
79072805
LW		 2461 Newz(1101, rcop, 1, LOGOP);
2462 rcop->op_type = OP_REGCOMP;
22c35a8c 2463 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 2464 rcop->op_first = scalar(expr);
3280af22 2465 rcop->op_flags |= ((PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2466 ? (OPf_SPECIAL | OPf_KIDS)
2467 : OPf_KIDS);
79072805 2468 rcop->op_private = 1;
11343788 2469 rcop->op_other = o;
79072805
LW		 2470
2471 /* establish postfix order */
3280af22 2472 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2473 LINKLIST(expr);
2474 rcop->op_next = expr;
2475 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2476 }
2477 else {
2478 rcop->op_next = LINKLIST(expr);
2479 expr->op_next = (OP*)rcop;
2480 }
79072805 2481
11343788 2482 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2483 }
2484
2485 if (repl) {
748a9306
LW		 2486 OP *curop;
2487 if (pm->op_pmflags & PMf_EVAL)
2488 curop = 0;
554b3eca 2489#ifdef USE_THREADS
2faa37cc 2490 else if (repl->op_type == OP_THREADSV
554b3eca 2491 && strchr("&`'123456789+",
533c011a 2492 PL_threadsv_names[repl->op_targ]))
554b3eca
MB		 2493 {
2494 curop = 0;
2495 }
2496#endif /* USE_THREADS */
748a9306
LW		 2497 else if (repl->op_type == OP_CONST)
2498 curop = repl;
79072805 2499 else {
79072805
LW		 2500 OP *lastop = 0;
2501 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 2502 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
554b3eca 2503#ifdef USE_THREADS
ce862d02
IZ		 2504 if (curop->op_type == OP_THREADSV) {
2505 repl_has_vars = 1;
be949f6f 2506 if (strchr("&`'123456789+", curop->op_private))
ce862d02 2507 break;
554b3eca
MB		 2508 }
2509#else
79072805
LW		 2510 if (curop->op_type == OP_GV) {
2511 GV *gv = ((GVOP*)curop)->op_gv;
ce862d02 2512 repl_has_vars = 1;
93a17b20 2513 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 2514 break;
2515 }
554b3eca 2516#endif /* USE_THREADS */
79072805
LW		 2517 else if (curop->op_type == OP_RV2CV)
2518 break;
2519 else if (curop->op_type == OP_RV2SV ||
2520 curop->op_type == OP_RV2AV ||
2521 curop->op_type == OP_RV2HV ||
2522 curop->op_type == OP_RV2GV) {
2523 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2524 break;
2525 }
748a9306
LW		 2526 else if (curop->op_type == OP_PADSV ||
2527 curop->op_type == OP_PADAV ||
2528 curop->op_type == OP_PADHV ||
554b3eca 2529 curop->op_type == OP_PADANY) {
ce862d02 2530 repl_has_vars = 1;
748a9306 2531 }
1167e5da
SM		 2532 else if (curop->op_type == OP_PUSHRE)
2533 ; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 2534 else
2535 break;
2536 }
2537 lastop = curop;
2538 }
748a9306 2539 }
ce862d02
IZ		 2540 if (curop == repl
2541 && !(repl_has_vars
2542 && (!pm->op_pmregexp
2543 || pm->op_pmregexp->reganch & ROPT_EVAL_SEEN))) {
748a9306 2544 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2545 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2546 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2547 }
2548 else {
ce862d02
IZ		 2549 if (curop == repl && !pm->op_pmregexp) { /* Has variables. */
2550 pm->op_pmflags |= PMf_MAYBE_CONST;
2551 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2552 }
748a9306
LW		 2553 Newz(1101, rcop, 1, LOGOP);
2554 rcop->op_type = OP_SUBSTCONT;
22c35a8c 2555 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 2556 rcop->op_first = scalar(repl);
2557 rcop->op_flags |= OPf_KIDS;
2558 rcop->op_private = 1;
11343788 2559 rcop->op_other = o;
748a9306
LW		 2560
2561 /* establish postfix order */
2562 rcop->op_next = LINKLIST(repl);
2563 repl->op_next = (OP*)rcop;
2564
2565 pm->op_pmreplroot = scalar((OP*)rcop);
2566 pm->op_pmreplstart = LINKLIST(rcop);
2567 rcop->op_next = 0;
79072805
LW		 2568 }
2569 }
2570
2571 return (OP*)pm;
2572}
2573
2574OP *
8ac85365 2575newSVOP(I32 type, I32 flags, SV *sv)
79072805
LW		 2576{
2577 SVOP *svop;
2578 Newz(1101, svop, 1, SVOP);
2579 svop->op_type = type;
22c35a8c 2580 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2581 svop->op_sv = sv;
2582 svop->op_next = (OP*)svop;
2583 svop->op_flags = flags;
22c35a8c 2584 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2585 scalar((OP*)svop);
22c35a8c 2586 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2587 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2588 return CHECKOP(type, svop);
79072805
LW		 2589}
2590
2591OP *
8ac85365 2592newGVOP(I32 type, I32 flags, GV *gv)
79072805 2593{
11343788 2594 dTHR;
79072805
LW		 2595 GVOP *gvop;
2596 Newz(1101, gvop, 1, GVOP);
2597 gvop->op_type = type;
22c35a8c 2598 gvop->op_ppaddr = PL_ppaddr[type];
8990e307 2599 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2600 gvop->op_next = (OP*)gvop;
2601 gvop->op_flags = flags;
22c35a8c 2602 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2603 scalar((OP*)gvop);
22c35a8c 2604 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2605 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2606 return CHECKOP(type, gvop);
79072805
LW		 2607}
2608
2609OP *
8ac85365 2610newPVOP(I32 type, I32 flags, char *pv)
79072805
LW		 2611{
2612 PVOP *pvop;
2613 Newz(1101, pvop, 1, PVOP);
2614 pvop->op_type = type;
22c35a8c 2615 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2616 pvop->op_pv = pv;
2617 pvop->op_next = (OP*)pvop;
2618 pvop->op_flags = flags;
22c35a8c 2619 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2620 scalar((OP*)pvop);
22c35a8c 2621 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2622 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2623 return CHECKOP(type, pvop);
79072805
LW		 2624}
2625
79072805 2626void
8ac85365 2627package(OP *o)
79072805 2628{
11343788 2629 dTHR;
93a17b20 2630 SV *sv;
79072805 2631
3280af22
NIS		 2632 save_hptr(&PL_curstash);
2633 save_item(PL_curstname);
11343788 2634 if (o) {
463ee0b2
LW		 2635 STRLEN len;
2636 char *name;
11343788 2637 sv = cSVOPo->op_sv;
463ee0b2 2638 name = SvPV(sv, len);
3280af22
NIS		 2639 PL_curstash = gv_stashpvn(name,len,TRUE);
2640 sv_setpvn(PL_curstname, name, len);
11343788 2641 op_free(o);
93a17b20
LW		 2642 }
2643 else {
3280af22
NIS		 2644 sv_setpv(PL_curstname,"<none>");
2645 PL_curstash = Nullhv;
93a17b20 2646 }
7ad382f4 2647 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 2648 PL_copline = NOLINE;
2649 PL_expect = XSTATE;
79072805
LW		 2650}
2651
85e6fe83 2652void
8ac85365 2653utilize(int aver, I32 floor, OP *version, OP *id, OP *arg)
85e6fe83 2654{
a0d0e21e
LW		 2655 OP *pack;
2656 OP *meth;
2657 OP *rqop;
2658 OP *imop;
b1cb66bf 2659 OP *veop;
78ca652e 2660 GV *gv;
85e6fe83 2661
a0d0e21e
LW		 2662 if (id->op_type != OP_CONST)
2663 croak("Module name must be constant");
85e6fe83 2664
b1cb66bf 2665 veop = Nullop;
2666
2667 if(version != Nullop) {
2668 SV *vesv = ((SVOP*)version)->op_sv;
2669
2670 if (arg == Nullop && !SvNIOK(vesv)) {
2671 arg = version;
2672 }
2673 else {
2674 OP *pack;
2675 OP *meth;
2676
2677 if (version->op_type != OP_CONST || !SvNIOK(vesv))
2678 croak("Version number must be constant number");
2679
2680 /* Make copy of id so we don't free it twice */
2681 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2682
2683 /* Fake up a method call to VERSION */
2684 meth = newSVOP(OP_CONST, 0, newSVpv("VERSION", 7));
2685 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2686 append_elem(OP_LIST,
2687 prepend_elem(OP_LIST, pack, list(version)),
2688 newUNOP(OP_METHOD, 0, meth)));
2689 }
2690 }
aeea060c 2691
a0d0e21e 2692 /* Fake up an import/unimport */
4633a7c4
LW		 2693 if (arg && arg->op_type == OP_STUB)
2694 imop = arg; /* no import on explicit () */
b1cb66bf 2695 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2696 imop = Nullop; /* use 5.0; */
2697 }
4633a7c4
LW		 2698 else {
2699 /* Make copy of id so we don't free it twice */
2700 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4
LW		 2701 meth = newSVOP(OP_CONST, 0,
2702 aver
2703 ? newSVpv("import", 6)
2704 : newSVpv("unimport", 8)
2705 );
2706 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2707 append_elem(OP_LIST,
2708 prepend_elem(OP_LIST, pack, list(arg)),
2709 newUNOP(OP_METHOD, 0, meth)));
4633a7c4
LW		 2710 }
2711
78ca652e
GS		 2712 /* Fake up a require, handle override, if any */
2713 gv = gv_fetchpv("require", FALSE, SVt_PVCV);
2714 if (!(gv && GvIMPORTED_CV(gv)))
2715 gv = gv_fetchpv("CORE::GLOBAL::require", FALSE, SVt_PVCV);
2716
2717 if (gv && GvIMPORTED_CV(gv)) {
2718 rqop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
2719 append_elem(OP_LIST, id,
2720 scalar(newUNOP(OP_RV2CV, 0,
2721 newGVOP(OP_GV, 0,
2722 gv))))));
2723 }
2724 else {
2725 rqop = newUNOP(OP_REQUIRE, 0, id);
2726 }
a0d0e21e
LW		 2727
2728 /* Fake up the BEGIN {}, which does its thing immediately. */
c07a80fd 2729 newSUB(floor,
a0d0e21e 2730 newSVOP(OP_CONST, 0, newSVpv("BEGIN", 5)),
4633a7c4 2731 Nullop,
a0d0e21e 2732 append_elem(OP_LINESEQ,
b1cb66bf 2733 append_elem(OP_LINESEQ,
2734 newSTATEOP(0, Nullch, rqop),
2735 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2736 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2737
3280af22
NIS		 2738 PL_copline = NOLINE;
2739 PL_expect = XSTATE;
85e6fe83
LW		 2740}
2741
79072805 2742OP *
78ca652e
GS		 2743dofile(OP *term)
2744{
2745 OP *doop;
2746 GV *gv;
2747
2748 gv = gv_fetchpv("do", FALSE, SVt_PVCV);
2749 if (!(gv && GvIMPORTED_CV(gv)))
2750 gv = gv_fetchpv("CORE::GLOBAL::do", FALSE, SVt_PVCV);
2751
2752 if (gv && GvIMPORTED_CV(gv)) {
2753 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
2754 append_elem(OP_LIST, term,
2755 scalar(newUNOP(OP_RV2CV, 0,
2756 newGVOP(OP_GV, 0,
2757 gv))))));
2758 }
2759 else {
2760 doop = newUNOP(OP_DOFILE, 0, scalar(term));
2761 }
2762 return doop;
2763}
2764
2765OP *
8ac85365 2766newSLICEOP(I32 flags, OP *subscript, OP *listval)
79072805
LW		 2767{
2768 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 2769 list(force_list(subscript)),
2770 list(force_list(listval)) );
79072805
LW		 2771}
2772
76e3520e 2773STATIC I32
8ac85365 2774list_assignment(register OP *o)
79072805 2775{
11343788 2776 if (!o)
79072805
LW		 2777 return TRUE;
2778
11343788
MB		 2779 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
2780 o = cUNOPo->op_first;
79072805 2781
11343788
MB		 2782 if (o->op_type == OP_COND_EXPR) {
2783 I32 t = list_assignment(cCONDOPo->op_first->op_sibling);
2784 I32 f = list_assignment(cCONDOPo->op_first->op_sibling->op_sibling);
79072805
LW		 2785
2786 if (t && f)
2787 return TRUE;
2788 if (t || f)
2789 yyerror("Assignment to both a list and a scalar");
2790 return FALSE;
2791 }
2792
11343788
MB		 2793 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
2794 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
2795 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 2796 return TRUE;
2797
11343788 2798 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 2799 return TRUE;
2800
11343788 2801 if (o->op_type == OP_RV2SV)
79072805
LW		 2802 return FALSE;
2803
2804 return FALSE;
2805}
2806
2807OP *
8ac85365 2808newASSIGNOP(I32 flags, OP *left, I32 optype, OP *right)
79072805 2809{
11343788 2810 OP *o;
79072805 2811
a0d0e21e
LW		 2812 if (optype) {
2813 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
2814 return newLOGOP(optype, 0,
2815 mod(scalar(left), optype),
2816 newUNOP(OP_SASSIGN, 0, scalar(right)));
2817 }
2818 else {
2819 return newBINOP(optype, OPf_STACKED,
2820 mod(scalar(left), optype), scalar(right));
2821 }
2822 }
2823
79072805 2824 if (list_assignment(left)) {
6ee623d5 2825 dTHR;
3280af22
NIS		 2826 PL_modcount = 0;
2827 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 2828 left = mod(left, OP_AASSIGN);
3280af22
NIS		 2829 if (PL_eval_start)
2830 PL_eval_start = 0;
748a9306 2831 else {
a0d0e21e
LW		 2832 op_free(left);
2833 op_free(right);
2834 return Nullop;
2835 }
11343788 2836 o = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 2837 list(force_list(right)),
2838 list(force_list(left)) );
11343788 2839 o->op_private = 0 | (flags >> 8);
a0d0e21e 2840 if (!(left->op_private & OPpLVAL_INTRO)) {
79072805 2841 OP *curop;
11343788 2842 OP *lastop = o;
3280af22 2843 PL_generation++;
11343788 2844 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 2845 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805
LW		 2846 if (curop->op_type == OP_GV) {
2847 GV *gv = ((GVOP*)curop)->op_gv;
3280af22 2848 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
79072805 2849 break;
3280af22 2850 SvCUR(gv) = PL_generation;
79072805 2851 }
748a9306
LW		 2852 else if (curop->op_type == OP_PADSV ||
2853 curop->op_type == OP_PADAV ||
2854 curop->op_type == OP_PADHV ||
2855 curop->op_type == OP_PADANY) {
3280af22 2856 SV **svp = AvARRAY(PL_comppad_name);
8e07c86e 2857 SV *sv = svp[curop->op_targ];
3280af22 2858 if (SvCUR(sv) == PL_generation)
748a9306 2859 break;
3280af22 2860 SvCUR(sv) = PL_generation; /* (SvCUR not used any more) */
748a9306 2861 }
79072805
LW		 2862 else if (curop->op_type == OP_RV2CV)
2863 break;
2864 else if (curop->op_type == OP_RV2SV ||
2865 curop->op_type == OP_RV2AV ||
2866 curop->op_type == OP_RV2HV ||
2867 curop->op_type == OP_RV2GV) {
2868 if (lastop->op_type != OP_GV) /* funny deref? */
2869 break;
2870 }
1167e5da
SM		 2871 else if (curop->op_type == OP_PUSHRE) {
2872 if (((PMOP*)curop)->op_pmreplroot) {
2873 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
3280af22 2874 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
1167e5da 2875 break;
3280af22 2876 SvCUR(gv) = PL_generation;
1167e5da
SM		 2877 }
2878 }
79072805
LW		 2879 else
2880 break;
2881 }
2882 lastop = curop;
2883 }
11343788
MB		 2884 if (curop != o)
2885 o->op_private = OPpASSIGN_COMMON;
79072805 2886 }
c07a80fd 2887 if (right && right->op_type == OP_SPLIT) {
2888 OP* tmpop;
2889 if ((tmpop = ((LISTOP*)right)->op_first) &&
2890 tmpop->op_type == OP_PUSHRE)
2891 {
2892 PMOP *pm = (PMOP*)tmpop;
2893 if (left->op_type == OP_RV2AV &&
2894 !(left->op_private & OPpLVAL_INTRO) &&
11343788 2895 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 2896 {
2897 tmpop = ((UNOP*)left)->op_first;
2898 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
2899 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
2900 pm->op_pmflags |= PMf_ONCE;
11343788 2901 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 2902 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
2903 tmpop->op_sibling = Nullop; /* don't free split */
2904 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 2905 op_free(o); /* blow off assign */
54310121 2906 right->op_flags &= ~OPf_WANT;
a5f75d66 2907 /* "I don't know and I don't care." */
c07a80fd 2908 return right;
2909 }
2910 }
2911 else {
3280af22 2912 if (PL_modcount < 10000 &&
c07a80fd 2913 ((LISTOP*)right)->op_last->op_type == OP_CONST)
2914 {
2915 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
2916 if (SvIVX(sv) == 0)
3280af22 2917 sv_setiv(sv, PL_modcount+1);
c07a80fd 2918 }
2919 }
2920 }
2921 }
11343788 2922 return o;
79072805
LW		 2923 }
2924 if (!right)
2925 right = newOP(OP_UNDEF, 0);
2926 if (right->op_type == OP_READLINE) {
2927 right->op_flags |= OPf_STACKED;
463ee0b2 2928 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 2929 }
a0d0e21e 2930 else {
3280af22 2931 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 2932 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 2933 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 2934 if (PL_eval_start)
2935 PL_eval_start = 0;
748a9306 2936 else {
11343788 2937 op_free(o);
a0d0e21e
LW		 2938 return Nullop;
2939 }
2940 }
11343788 2941 return o;
79072805
LW		 2942}
2943
2944OP *
8ac85365 2945newSTATEOP(I32 flags, char *label, OP *o)
79072805 2946{
11343788 2947 dTHR;
bbce6d69 2948 U32 seq = intro_my();
79072805
LW		 2949 register COP *cop;
2950
2951 Newz(1101, cop, 1, COP);
3280af22 2952 if (PERLDB_LINE && PL_curcop->cop_line && PL_curstash != PL_debstash) {
8990e307 2953 cop->op_type = OP_DBSTATE;
22c35a8c 2954 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 2955 }
2956 else {
2957 cop->op_type = OP_NEXTSTATE;
22c35a8c 2958 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 2959 }
79072805 2960 cop->op_flags = flags;
a0ed51b3 2961 cop->op_private = (PL_hints & HINT_UTF8);
ff0cee69 2962#ifdef NATIVE_HINTS
2963 cop->op_private |= NATIVE_HINTS;
2964#endif
e24b16f9 2965 PL_compiling.op_private = cop->op_private;
79072805
LW		 2966 cop->op_next = (OP*)cop;
2967
463ee0b2
LW		 2968 if (label) {
2969 cop->cop_label = label;
3280af22 2970 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 2971 }
bbce6d69 2972 cop->cop_seq = seq;
3280af22 2973 cop->cop_arybase = PL_curcop->cop_arybase;
599cee73
PM		 2974 if (PL_curcop->cop_warnings == WARN_NONE
2975 || PL_curcop->cop_warnings == WARN_ALL)
2976 cop->cop_warnings = PL_curcop->cop_warnings ;
2977 else
2978 cop->cop_warnings = newSVsv(PL_curcop->cop_warnings) ;
2979
79072805 2980
3280af22
NIS		 2981 if (PL_copline == NOLINE)
2982 cop->cop_line = PL_curcop->cop_line;
79072805 2983 else {
3280af22
NIS		 2984 cop->cop_line = PL_copline;
2985 PL_copline = NOLINE;
79072805 2986 }
3280af22
NIS		 2987 cop->cop_filegv = (GV*)SvREFCNT_inc(PL_curcop->cop_filegv);
2988 cop->cop_stash = PL_curstash;
79072805 2989
3280af22
NIS		 2990 if (PERLDB_LINE && PL_curstash != PL_debstash) {
2991 SV **svp = av_fetch(GvAV(PL_curcop->cop_filegv),(I32)cop->cop_line, FALSE);
2992 if (svp && *svp != &PL_sv_undef && !SvIOK(*svp)) {
a0d0e21e 2993 (void)SvIOK_on(*svp);
a5f75d66 2994 SvIVX(*svp) = 1;
93a17b20
LW		 2995 SvSTASH(*svp) = (HV*)cop;
2996 }
2997 }
2998
11343788 2999 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3000}
3001
bbce6d69 3002/* "Introduce" my variables to visible status. */
3003U32
8ac85365 3004intro_my(void)
bbce6d69 3005{
3006 SV **svp;
3007 SV *sv;
3008 I32 i;
3009
3280af22
NIS		 3010 if (! PL_min_intro_pending)
3011 return PL_cop_seqmax;
bbce6d69 3012
3280af22
NIS		 3013 svp = AvARRAY(PL_comppad_name);
3014 for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
3015 if ((sv = svp[i]) && sv != &PL_sv_undef && !SvIVX(sv)) {
c53d7c7d 3016 SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */
3280af22 3017 SvNVX(sv) = (double)PL_cop_seqmax;
bbce6d69 3018 }
3019 }
3280af22
NIS		 3020 PL_min_intro_pending = 0;
3021 PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
3022 return PL_cop_seqmax++;
bbce6d69 3023}
3024
79072805 3025OP *
8ac85365 3026newLOGOP(I32 type, I32 flags, OP *first, OP *other)
79072805 3027{
883ffac3
CS		 3028 return new_logop(type, flags, &first, &other);
3029}
3030
3bd495df 3031STATIC OP *
883ffac3
CS		 3032new_logop(I32 type, I32 flags, OP** firstp, OP** otherp)
3033{
11343788 3034 dTHR;
79072805 3035 LOGOP *logop;
11343788 3036 OP *o;
883ffac3
CS		 3037 OP *first = *firstp;
3038 OP *other = *otherp;
79072805 3039
a0d0e21e
LW		 3040 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
3041 return newBINOP(type, flags, scalar(first), scalar(other));
3042
8990e307 3043 scalarboolean(first);
79072805
LW		 3044 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
3045 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
3046 if (type == OP_AND || type == OP_OR) {
3047 if (type == OP_AND)
3048 type = OP_OR;
3049 else
3050 type = OP_AND;
11343788 3051 o = first;
883ffac3 3052 first = *firstp = cUNOPo->op_first;
11343788
MB		 3053 if (o->op_next)
3054 first->op_next = o->op_next;
3055 cUNOPo->op_first = Nullop;
3056 op_free(o);
79072805
LW		 3057 }
3058 }
3059 if (first->op_type == OP_CONST) {
599cee73
PM		 3060 if (ckWARN(WARN_PRECEDENCE) && (first->op_private & OPpCONST_BARE))
3061 warner(WARN_PRECEDENCE, "Probable precedence problem on %s",
22c35a8c 3062 PL_op_desc[type]);
79072805
LW		 3063 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
3064 op_free(first);
883ffac3 3065 *firstp = Nullop;
79072805
LW		 3066 return other;
3067 }
3068 else {
3069 op_free(other);
883ffac3 3070 *otherp = Nullop;
79072805
LW		 3071 return first;
3072 }
3073 }
3074 else if (first->op_type == OP_WANTARRAY) {
3075 if (type == OP_AND)
3076 list(other);
3077 else
3078 scalar(other);
3079 }
599cee73 3080 else if (ckWARN(WARN_UNSAFE) && (first->op_flags & OPf_KIDS)) {
a6006777 3081 OP *k1 = ((UNOP*)first)->op_first;
3082 OP *k2 = k1->op_sibling;
3083 OPCODE warnop = 0;
3084 switch (first->op_type)
3085 {
3086 case OP_NULL:
3087 if (k2 && k2->op_type == OP_READLINE
3088 && (k2->op_flags & OPf_STACKED)
55d729e4 3089 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
a6006777 3090 warnop = k2->op_type;
3091 break;
3092
3093 case OP_SASSIGN:
68dc0745 3094 if (k1->op_type == OP_READDIR
3095 || k1->op_type == OP_GLOB
3096 || k1->op_type == OP_EACH)
a6006777 3097 warnop = k1->op_type;
3098 break;
3099 }
8ebc5c01 3100 if (warnop) {
3280af22
NIS		 3101 line_t oldline = PL_curcop->cop_line;
3102 PL_curcop->cop_line = PL_copline;
599cee73
PM		 3103 warner(WARN_UNSAFE,
3104 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 3105 PL_op_desc[warnop],
68dc0745 3106 ((warnop == OP_READLINE || warnop == OP_GLOB)
3107 ? " construct" : "() operator"));
3280af22 3108 PL_curcop->cop_line = oldline;
8ebc5c01 3109 }
a6006777 3110 }
79072805
LW		 3111
3112 if (!other)
3113 return first;
3114
a0d0e21e
LW		 3115 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
3116 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
3117
79072805
LW		 3118 Newz(1101, logop, 1, LOGOP);
3119
3120 logop->op_type = type;
22c35a8c 3121 logop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3122 logop->op_first = first;
3123 logop->op_flags = flags | OPf_KIDS;
3124 logop->op_other = LINKLIST(other);
c07a80fd 3125 logop->op_private = 1 | (flags >> 8);
79072805
LW		 3126
3127 /* establish postfix order */
3128 logop->op_next = LINKLIST(first);
3129 first->op_next = (OP*)logop;
3130 first->op_sibling = other;
3131
11343788
MB		 3132 o = newUNOP(OP_NULL, 0, (OP*)logop);
3133 other->op_next = o;
79072805 3134
11343788 3135 return o;
79072805
LW		 3136}
3137
3138OP *
8ac85365 3139newCONDOP(I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 3140{
11343788 3141 dTHR;
79072805 3142 CONDOP *condop;
11343788 3143 OP *o;
79072805 3144
b1cb66bf 3145 if (!falseop)
3146 return newLOGOP(OP_AND, 0, first, trueop);
3147 if (!trueop)
3148 return newLOGOP(OP_OR, 0, first, falseop);
79072805 3149
8990e307 3150 scalarboolean(first);
79072805
LW		 3151 if (first->op_type == OP_CONST) {
3152 if (SvTRUE(((SVOP*)first)->op_sv)) {
3153 op_free(first);
b1cb66bf 3154 op_free(falseop);
3155 return trueop;
79072805
LW		 3156 }
3157 else {
3158 op_free(first);
b1cb66bf 3159 op_free(trueop);
3160 return falseop;
79072805
LW		 3161 }
3162 }
3163 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 3164 list(trueop);
3165 scalar(falseop);
79072805
LW		 3166 }
3167 Newz(1101, condop, 1, CONDOP);
3168
3169 condop->op_type = OP_COND_EXPR;
22c35a8c 3170 condop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
79072805
LW		 3171 condop->op_first = first;
3172 condop->op_flags = flags | OPf_KIDS;
b1cb66bf 3173 condop->op_true = LINKLIST(trueop);
3174 condop->op_false = LINKLIST(falseop);
c07a80fd 3175 condop->op_private = 1 | (flags >> 8);
79072805
LW		 3176
3177 /* establish postfix order */
3178 condop->op_next = LINKLIST(first);
3179 first->op_next = (OP*)condop;
3180
b1cb66bf 3181 first->op_sibling = trueop;
3182 trueop->op_sibling = falseop;
11343788 3183 o = newUNOP(OP_NULL, 0, (OP*)condop);
79072805 3184
5dc0d613
MB		 3185 trueop->op_next = o;
3186 falseop->op_next = o;
79072805 3187
11343788 3188 return o;
79072805
LW		 3189}
3190
3191OP *
8ac85365 3192newRANGE(I32 flags, OP *left, OP *right)
79072805 3193{
b35b2403 3194 dTHR;
79072805
LW		 3195 CONDOP *condop;
3196 OP *flip;
3197 OP *flop;
11343788 3198 OP *o;
79072805
LW		 3199
3200 Newz(1101, condop, 1, CONDOP);
3201
3202 condop->op_type = OP_RANGE;
22c35a8c 3203 condop->op_ppaddr = PL_ppaddr[OP_RANGE];
79072805
LW		 3204 condop->op_first = left;
3205 condop->op_flags = OPf_KIDS;
3206 condop->op_true = LINKLIST(left);
3207 condop->op_false = LINKLIST(right);
c07a80fd 3208 condop->op_private = 1 | (flags >> 8);
79072805
LW		 3209
3210 left->op_sibling = right;
3211
3212 condop->op_next = (OP*)condop;
3213 flip = newUNOP(OP_FLIP, flags, (OP*)condop);
3214 flop = newUNOP(OP_FLOP, 0, flip);
11343788 3215 o = newUNOP(OP_NULL, 0, flop);
79072805
LW		 3216 linklist(flop);
3217
3218 left->op_next = flip;
3219 right->op_next = flop;
3220
ed6116ce 3221 condop->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805 3222 sv_upgrade(PAD_SV(condop->op_targ), SVt_PVNV);
ed6116ce 3223 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 3224 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
3225
3226 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3227 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3228
11343788 3229 flip->op_next = o;
79072805 3230 if (!flip->op_private || !flop->op_private)
11343788 3231 linklist(o); /* blow off optimizer unless constant */
79072805 3232
11343788 3233 return o;
79072805
LW		 3234}
3235
3236OP *
8ac85365 3237newLOOPOP(I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 3238{
11343788 3239 dTHR;
463ee0b2 3240 OP* listop;
11343788 3241 OP* o;
463ee0b2 3242 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 3243 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 3244
463ee0b2
LW		 3245 if (expr) {
3246 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
3247 return block; /* do {} while 0 does once */
fb73857a 3248 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3249 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 3250 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3251 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3252 } else if (expr->op_flags & OPf_KIDS) {
3253 OP *k1 = ((UNOP*)expr)->op_first;
3254 OP *k2 = (k1) ? k1->op_sibling : NULL;
3255 switch (expr->op_type) {
3256 case OP_NULL:
3257 if (k2 && k2->op_type == OP_READLINE
3258 && (k2->op_flags & OPf_STACKED)
3259 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3260 expr = newUNOP(OP_DEFINED, 0, expr);
3261 break;
3262
3263 case OP_SASSIGN:
3264 if (k1->op_type == OP_READDIR
3265 || k1->op_type == OP_GLOB
3266 || k1->op_type == OP_EACH)
3267 expr = newUNOP(OP_DEFINED, 0, expr);
3268 break;
3269 }
774d564b 3270 }
463ee0b2 3271 }
93a17b20 3272
8990e307 3273 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 3274 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 3275
883ffac3
CS		 3276 if (listop)
3277 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 3278
11343788
MB		 3279 if (once && o != listop)
3280 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 3281
11343788
MB		 3282 if (o == listop)
3283 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 3284
11343788
MB		 3285 o->op_flags |= flags;
3286 o = scope(o);
3287 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
3288 return o;
79072805
LW		 3289}
3290
3291OP *
8ac85365 3292newWHILEOP(I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805 3293{
11343788 3294 dTHR;
79072805
LW		 3295 OP *redo;
3296 OP *next = 0;
3297 OP *listop;
11343788 3298 OP *o;
79072805
LW		 3299 OP *condop;
3300
fb73857a 3301 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3302 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 3303 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3304 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3305 } else if (expr && (expr->op_flags & OPf_KIDS)) {
3306 OP *k1 = ((UNOP*)expr)->op_first;
3307 OP *k2 = (k1) ? k1->op_sibling : NULL;
3308 switch (expr->op_type) {
3309 case OP_NULL:
3310 if (k2 && k2->op_type == OP_READLINE
3311 && (k2->op_flags & OPf_STACKED)
3312 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3313 expr = newUNOP(OP_DEFINED, 0, expr);
3314 break;
3315
3316 case OP_SASSIGN:
3317 if (k1->op_type == OP_READDIR
3318 || k1->op_type == OP_GLOB
3319 || k1->op_type == OP_EACH)
3320 expr = newUNOP(OP_DEFINED, 0, expr);
3321 break;
3322 }
748a9306 3323 }
79072805
LW		 3324
3325 if (!block)
3326 block = newOP(OP_NULL, 0);
3327
3328 if (cont)
3329 next = LINKLIST(cont);
fb73857a 3330 if (expr) {
79072805 3331 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
fb73857a 3332 if ((line_t)whileline != NOLINE) {
3280af22 3333 PL_copline = whileline;
fb73857a 3334 cont = append_elem(OP_LINESEQ, cont,
3335 newSTATEOP(0, Nullch, Nullop));
3336 }
3337 }
79072805 3338
463ee0b2 3339 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 3340 redo = LINKLIST(listop);
3341
3342 if (expr) {
3280af22 3343 PL_copline = whileline;
883ffac3
CS		 3344 scalar(listop);
3345 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 3346 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 3347 op_free(expr); /* oops, it's a while (0) */
463ee0b2 3348 op_free((OP*)loop);
883ffac3 3349 return Nullop; /* listop already freed by new_logop */
463ee0b2 3350 }
883ffac3
CS		 3351 if (listop)
3352 ((LISTOP*)listop)->op_last->op_next = condop =
3353 (o == listop ? redo : LINKLIST(o));
79072805
LW		 3354 if (!next)
3355 next = condop;
3356 }
3357 else
11343788 3358 o = listop;
79072805
LW		 3359
3360 if (!loop) {
3361 Newz(1101,loop,1,LOOP);
3362 loop->op_type = OP_ENTERLOOP;
22c35a8c 3363 loop->op_ppaddr = PL_ppaddr[OP_ENTERLOOP];
79072805
LW		 3364 loop->op_private = 0;
3365 loop->op_next = (OP*)loop;
3366 }
3367
11343788 3368 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 3369
3370 loop->op_redoop = redo;
11343788 3371 loop->op_lastop = o;
79072805
LW		 3372
3373 if (next)
3374 loop->op_nextop = next;
3375 else
11343788 3376 loop->op_nextop = o;
79072805 3377
11343788
MB		 3378 o->op_flags |= flags;
3379 o->op_private |= (flags >> 8);
3380 return o;
79072805
LW		 3381}
3382
3383OP *
8990e307 3384newFOROP(I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
79072805
LW		 3385{
3386 LOOP *loop;
fb73857a 3387 OP *wop;
85e6fe83 3388 int padoff = 0;
4633a7c4 3389 I32 iterflags = 0;
79072805 3390
79072805 3391 if (sv) {
85e6fe83 3392 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306 3393 sv->op_type = OP_RV2GV;
22c35a8c 3394 sv->op_ppaddr = PL_ppaddr[OP_RV2GV];
79072805 3395 }
85e6fe83
LW		 3396 else if (sv->op_type == OP_PADSV) { /* private variable */
3397 padoff = sv->op_targ;
3398 op_free(sv);
3399 sv = Nullop;
3400 }
54b9620d
MB		 3401 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
3402 padoff = sv->op_targ;
3403 iterflags |= OPf_SPECIAL;
3404 op_free(sv);
3405 sv = Nullop;
3406 }
79072805 3407 else
22c35a8c 3408 croak("Can't use %s for loop variable", PL_op_desc[sv->op_type]);
79072805
LW		 3409 }
3410 else {
54b9620d
MB		 3411#ifdef USE_THREADS
3412 padoff = find_threadsv("_");
3413 iterflags |= OPf_SPECIAL;
3414#else
3280af22 3415 sv = newGVOP(OP_GV, 0, PL_defgv);
54b9620d 3416#endif
79072805 3417 }
5f05dabc 3418 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 3419 expr = mod(force_list(scalar(ref(expr, OP_ITER))), OP_GREPSTART);
4633a7c4
LW		 3420 iterflags |= OPf_STACKED;
3421 }
89ea2908
GA		 3422 else if (expr->op_type == OP_NULL &&
3423 (expr->op_flags & OPf_KIDS) &&
3424 ((BINOP*)expr)->op_first->op_type == OP_FLOP)
3425 {
3426 /* Basically turn for($x..$y) into the same as for($x,$y), but we
3427 * set the STACKED flag to indicate that these values are to be
3428 * treated as min/max values by 'pp_iterinit'.
3429 */
3430 UNOP* flip = (UNOP*)((UNOP*)((BINOP*)expr)->op_first)->op_first;
3431 CONDOP* range = (CONDOP*) flip->op_first;
3432 OP* left = range->op_first;
3433 OP* right = left->op_sibling;
5152d7c7 3434 LISTOP* listop;
89ea2908
GA		 3435
3436 range->op_flags &= ~OPf_KIDS;
3437 range->op_first = Nullop;
3438
5152d7c7
GS		 3439 listop = (LISTOP*)newLISTOP(OP_LIST, 0, left, right);
3440 listop->op_first->op_next = range->op_true;
89ea2908 3441 left->op_next = range->op_false;
5152d7c7
GS		 3442 right->op_next = (OP*)listop;
3443 listop->op_next = listop->op_first;
89ea2908
GA		 3444
3445 op_free(expr);
5152d7c7 3446 expr = (OP*)(listop);
89ea2908
GA		 3447 null(expr);
3448 iterflags |= OPf_STACKED;
3449 }
3450 else {
3451 expr = mod(force_list(expr), OP_GREPSTART);
3452 }
3453
3454
4633a7c4 3455 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
89ea2908 3456 append_elem(OP_LIST, expr, scalar(sv))));
85e6fe83
LW		 3457 assert(!loop->op_next);
3458 Renew(loop, 1, LOOP);
3459 loop->op_targ = padoff;
fb73857a 3460 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont);
3280af22 3461 PL_copline = forline;
fb73857a 3462 return newSTATEOP(0, label, wop);
79072805
LW		 3463}
3464
8990e307 3465OP*
8ac85365 3466newLOOPEX(I32 type, OP *label)
8990e307 3467{
11343788
MB		 3468 dTHR;
3469 OP *o;
2d8e6c8d
GS		 3470 STRLEN n_a;
3471
8990e307 3472 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 3473 /* "last()" means "last" */
3474 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
3475 o = newOP(type, OPf_SPECIAL);
3476 else {
3477 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
2d8e6c8d 3478 ? SvPVx(((SVOP*)label)->op_sv, n_a)
cdaebead
MB		 3479 : ""));
3480 }
8990e307
LW		 3481 op_free(label);
3482 }
3483 else {
a0d0e21e
LW		 3484 if (label->op_type == OP_ENTERSUB)
3485 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 3486 o = newUNOP(type, OPf_STACKED, label);
8990e307 3487 }
3280af22 3488 PL_hints |= HINT_BLOCK_SCOPE;
11343788 3489 return o;
8990e307
LW		 3490}
3491
79072805 3492void
8ac85365 3493cv_undef(CV *cv)
79072805 3494{
11343788
MB		 3495 dTHR;
3496#ifdef USE_THREADS
e858de61
MB		 3497 if (CvMUTEXP(cv)) {
3498 MUTEX_DESTROY(CvMUTEXP(cv));
3499 Safefree(CvMUTEXP(cv));
3500 CvMUTEXP(cv) = 0;
3501 }
11343788
MB		 3502#endif /* USE_THREADS */
3503
a0d0e21e 3504 if (!CvXSUB(cv) && CvROOT(cv)) {
11343788
MB		 3505#ifdef USE_THREADS
3506 if (CvDEPTH(cv) || (CvOWNER(cv) && CvOWNER(cv) != thr))
3507 croak("Can't undef active subroutine");
3508#else
a0d0e21e
LW		 3509 if (CvDEPTH(cv))
3510 croak("Can't undef active subroutine");
11343788 3511#endif /* USE_THREADS */
8990e307 3512 ENTER;
a0d0e21e 3513
3280af22
NIS		 3514 SAVESPTR(PL_curpad);
3515 PL_curpad = 0;
a0d0e21e 3516
a5f75d66 3517 if (!CvCLONED(cv))
748a9306 3518 op_free(CvROOT(cv));
79072805 3519 CvROOT(cv) = Nullop;
8990e307 3520 LEAVE;
79072805 3521 }
1d5db326 3522 SvPOK_off((SV*)cv); /* forget prototype */
44a8e56a 3523 CvFLAGS(cv) = 0;
8e07c86e
AD		 3524 SvREFCNT_dec(CvGV(cv));
3525 CvGV(cv) = Nullgv;
3526 SvREFCNT_dec(CvOUTSIDE(cv));
3527 CvOUTSIDE(cv) = Nullcv;
3528 if (CvPADLIST(cv)) {
8ebc5c01 3529 /* may be during global destruction */
3530 if (SvREFCNT(CvPADLIST(cv))) {
93965878 3531 I32 i = AvFILLp(CvPADLIST(cv));
8ebc5c01 3532 while (i >= 0) {
3533 SV** svp = av_fetch(CvPADLIST(cv), i--, FALSE);
46fc3d4c 3534 SV* sv = svp ? *svp : Nullsv;
3535 if (!sv)
3536 continue;
3280af22
NIS		 3537 if (sv == (SV*)PL_comppad_name)
3538 PL_comppad_name = Nullav;
3539 else if (sv == (SV*)PL_comppad) {
3540 PL_comppad = Nullav;
3541 PL_curpad = Null(SV**);
46fc3d4c 3542 }
3543 SvREFCNT_dec(sv);
8ebc5c01 3544 }
3545 SvREFCNT_dec((SV*)CvPADLIST(cv));
8e07c86e 3546 }
8e07c86e
AD		 3547 CvPADLIST(cv) = Nullav;
3548 }
79072805
LW		 3549}
3550
5f05dabc 3551#ifdef DEBUG_CLOSURES
76e3520e 3552STATIC void
5f05dabc 3553cv_dump(cv)
3554CV* cv;
3555{
3556 CV *outside = CvOUTSIDE(cv);
3557 AV* padlist = CvPADLIST(cv);
4fdae800 3558 AV* pad_name;
3559 AV* pad;
3560 SV** pname;
3561 SV** ppad;
5f05dabc 3562 I32 ix;
3563
fb73857a 3564 PerlIO_printf(Perl_debug_log, "\tCV=0x%lx (%s), OUTSIDE=0x%lx (%s)\n",
ab50184a
CS		 3565 cv,
3566 (CvANON(cv) ? "ANON"
6b88bc9c 3567 : (cv == PL_main_cv) ? "MAIN"
33b8ce05 3568 : CvUNIQUE(cv) ? "UNIQUE"
44a8e56a 3569 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
ab50184a
CS		 3570 outside,
3571 (!outside ? "null"
3572 : CvANON(outside) ? "ANON"
6b88bc9c 3573 : (outside == PL_main_cv) ? "MAIN"
07055b4c 3574 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3575 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
5f05dabc 3576
4fdae800 3577 if (!padlist)
3578 return;
3579
3580 pad_name = (AV*)*av_fetch(padlist, 0, FALSE);
3581 pad = (AV*)*av_fetch(padlist, 1, FALSE);
3582 pname = AvARRAY(pad_name);
3583 ppad = AvARRAY(pad);
3584
93965878 3585 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
5f05dabc 3586 if (SvPOK(pname[ix]))
fb73857a 3587 PerlIO_printf(Perl_debug_log, "\t%4d. 0x%lx (%s\"%s\" %ld-%ld)\n",
4fdae800 3588 ix, ppad[ix],
3589 SvFAKE(pname[ix]) ? "FAKE " : "",
3590 SvPVX(pname[ix]),
ab50184a
CS		 3591 (long)I_32(SvNVX(pname[ix])),
3592 (long)SvIVX(pname[ix]));
5f05dabc 3593 }
3594}
3595#endif /* DEBUG_CLOSURES */
3596
76e3520e 3597STATIC CV *
8ac85365 3598cv_clone2(CV *proto, CV *outside)
748a9306 3599{
11343788 3600 dTHR;
748a9306
LW		 3601 AV* av;
3602 I32 ix;
3603 AV* protopadlist = CvPADLIST(proto);
3604 AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
3605 AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
5f05dabc 3606 SV** pname = AvARRAY(protopad_name);
3607 SV** ppad = AvARRAY(protopad);
93965878
NIS		 3608 I32 fname = AvFILLp(protopad_name);
3609 I32 fpad = AvFILLp(protopad);
748a9306
LW		 3610 AV* comppadlist;
3611 CV* cv;
3612
07055b4c
CS		 3613 assert(!CvUNIQUE(proto));
3614
748a9306 3615 ENTER;
3280af22
NIS		 3616 SAVESPTR(PL_curpad);
3617 SAVESPTR(PL_comppad);
3618 SAVESPTR(PL_comppad_name);
3619 SAVESPTR(PL_compcv);
748a9306 3620
3280af22 3621 cv = PL_compcv = (CV*)NEWSV(1104,0);
fa83b5b6 3622 sv_upgrade((SV *)cv, SvTYPE(proto));
a5f75d66 3623 CvCLONED_on(cv);
5f05dabc 3624 if (CvANON(proto))
3625 CvANON_on(cv);
748a9306 3626
11343788 3627#ifdef USE_THREADS
12ca11f6 3628 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3629 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3630 CvOWNER(cv) = 0;
3631#endif /* USE_THREADS */
748a9306 3632 CvFILEGV(cv) = CvFILEGV(proto);
44a8e56a 3633 CvGV(cv) = (GV*)SvREFCNT_inc(CvGV(proto));
748a9306
LW		 3634 CvSTASH(cv) = CvSTASH(proto);
3635 CvROOT(cv) = CvROOT(proto);
3636 CvSTART(cv) = CvSTART(proto);
5f05dabc 3637 if (outside)
3638 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
748a9306 3639
68dc0745 3640 if (SvPOK(proto))
3641 sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto));
3642
3280af22 3643 PL_comppad_name = newAV();
46fc3d4c 3644 for (ix = fname; ix >= 0; ix--)
3280af22 3645 av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix]));
748a9306 3646
3280af22 3647 PL_comppad = newAV();
748a9306
LW		 3648
3649 comppadlist = newAV();
3650 AvREAL_off(comppadlist);
3280af22
NIS		 3651 av_store(comppadlist, 0, (SV*)PL_comppad_name);
3652 av_store(comppadlist, 1, (SV*)PL_comppad);
748a9306 3653 CvPADLIST(cv) = comppadlist;
3280af22
NIS		 3654 av_fill(PL_comppad, AvFILLp(protopad));
3655 PL_curpad = AvARRAY(PL_comppad);
748a9306
LW		 3656
3657 av = newAV(); /* will be @_ */
3658 av_extend(av, 0);
3280af22 3659 av_store(PL_comppad, 0, (SV*)av);
748a9306
LW		 3660 AvFLAGS(av) = AVf_REIFY;
3661
9607fc9c 3662 for (ix = fpad; ix > 0; ix--) {
3663 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
3280af22 3664 if (namesv && namesv != &PL_sv_undef) {
aa689395 3665 char *name = SvPVX(namesv); /* XXX */
3666 if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */
3667 I32 off = pad_findlex(name, ix, SvIVX(namesv),
155fc61f 3668 CvOUTSIDE(cv), cxstack_ix, 0);
5f05dabc 3669 if (!off)
3280af22 3670 PL_curpad[ix] = SvREFCNT_inc(ppad[ix]);
5f05dabc 3671 else if (off != ix)
748a9306
LW		 3672 croak("panic: cv_clone: %s", name);
3673 }
3674 else { /* our own lexical */
aa689395 3675 SV* sv;
5f05dabc 3676 if (*name == '&') {
3677 /* anon code -- we'll come back for it */
3678 sv = SvREFCNT_inc(ppad[ix]);
3679 }
3680 else if (*name == '@')
3681 sv = (SV*)newAV();
748a9306 3682 else if (*name == '%')
5f05dabc 3683 sv = (SV*)newHV();
748a9306 3684 else
5f05dabc 3685 sv = NEWSV(0,0);
3686 if (!SvPADBUSY(sv))
3687 SvPADMY_on(sv);
3280af22 3688 PL_curpad[ix] = sv;
748a9306
LW		 3689 }
3690 }
3691 else {
aa689395 3692 SV* sv = NEWSV(0,0);
748a9306 3693 SvPADTMP_on(sv);
3280af22 3694 PL_curpad[ix] = sv;
748a9306
LW		 3695 }
3696 }
3697
5f05dabc 3698 /* Now that vars are all in place, clone nested closures. */
3699
9607fc9c 3700 for (ix = fpad; ix > 0; ix--) {
3701 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3702 if (namesv
3280af22 3703 && namesv != &PL_sv_undef
aa689395 3704 && !(SvFLAGS(namesv) & SVf_FAKE)
3705 && *SvPVX(namesv) == '&'
5f05dabc 3706 && CvCLONE(ppad[ix]))
3707 {
3708 CV *kid = cv_clone2((CV*)ppad[ix], cv);
3709 SvREFCNT_dec(ppad[ix]);
3710 CvCLONE_on(kid);
3711 SvPADMY_on(kid);
3280af22 3712 PL_curpad[ix] = (SV*)kid;
748a9306
LW		 3713 }
3714 }
3715
5f05dabc 3716#ifdef DEBUG_CLOSURES
ab50184a
CS		 3717 PerlIO_printf(Perl_debug_log, "Cloned inside:\n");
3718 cv_dump(outside);
3719 PerlIO_printf(Perl_debug_log, " from:\n");
5f05dabc 3720 cv_dump(proto);
ab50184a 3721 PerlIO_printf(Perl_debug_log, " to:\n");
5f05dabc 3722 cv_dump(cv);
3723#endif
3724
748a9306
LW		 3725 LEAVE;
3726 return cv;
3727}
3728
3729CV *
8ac85365 3730cv_clone(CV *proto)
5f05dabc 3731{
b099ddc0
GS		 3732 CV *cv;
3733 MUTEX_LOCK(&PL_cred_mutex); /* XXX create separate mutex */
3734 cv = cv_clone2(proto, CvOUTSIDE(proto));
3735 MUTEX_UNLOCK(&PL_cred_mutex); /* XXX create separate mutex */
3736 return cv;
5f05dabc 3737}
3738
3fe9a6f1 3739void
8ac85365 3740cv_ckproto(CV *cv, GV *gv, char *p)
3fe9a6f1 3741{
3742 if ((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX(cv)))) {
46fc3d4c 3743 SV* msg = sv_newmortal();
3fe9a6f1 3744 SV* name = Nullsv;
3745
3746 if (gv)
46fc3d4c 3747 gv_efullname3(name = sv_newmortal(), gv, Nullch);
3748 sv_setpv(msg, "Prototype mismatch:");
3749 if (name)
fc36a67e 3750 sv_catpvf(msg, " sub %_", name);
3fe9a6f1 3751 if (SvPOK(cv))
46fc3d4c 3752 sv_catpvf(msg, " (%s)", SvPVX(cv));
3753 sv_catpv(msg, " vs ");
3754 if (p)
3755 sv_catpvf(msg, "(%s)", p);
3756 else
3757 sv_catpv(msg, "none");
fc36a67e 3758 warn("%_", msg);
3fe9a6f1 3759 }
3760}
3761
760ac839 3762SV *
8ac85365 3763cv_const_sv(CV *cv)
760ac839 3764{
54310121 3765 if (!cv || !SvPOK(cv) || SvCUR(cv))
3766 return Nullsv;
fe5e78ed
GS		 3767 return op_const_sv(CvSTART(cv), cv);
3768}
760ac839 3769
fe5e78ed
GS		 3770SV *
3771op_const_sv(OP *o, CV *cv)
3772{
3773 SV *sv = Nullsv;
3774
3775 if(!o)
3776 return Nullsv;
3777
3778 if(o->op_type == OP_LINESEQ && cLISTOPo->op_first)
3779 o = cLISTOPo->op_first->op_sibling;
3780
3781 for (; o; o = o->op_next) {
54310121 3782 OPCODE type = o->op_type;
fe5e78ed
GS		 3783
3784 if(sv && o->op_next == o)
3785 return sv;
54310121 3786 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
3787 continue;
3788 if (type == OP_LEAVESUB || type == OP_RETURN)
3789 break;
3790 if (sv)
3791 return Nullsv;
3792 if (type == OP_CONST)
5dc0d613 3793 sv = cSVOPo->op_sv;
fe5e78ed 3794 else if (type == OP_PADSV && cv) {
e858de61
MB		 3795 AV* padav = (AV*)(AvARRAY(CvPADLIST(cv))[1]);
3796 sv = padav ? AvARRAY(padav)[o->op_targ] : Nullsv;
5aabfad6 3797 if (!sv || (!SvREADONLY(sv) && SvREFCNT(sv) > 1))
54310121 3798 return Nullsv;
760ac839 3799 }
54310121 3800 else
3801 return Nullsv;
760ac839 3802 }
5aabfad6 3803 if (sv)
3804 SvREADONLY_on(sv);
760ac839
LW		 3805 return sv;
3806}
3807
748a9306 3808CV *
8ac85365 3809newSUB(I32 floor, OP *o, OP *proto, OP *block)
79072805 3810{
11343788 3811 dTHR;
2d8e6c8d
GS		 3812 STRLEN n_a;
3813 char *name = o ? SvPVx(cSVOPo->op_sv, n_a) : Nullch;
55d729e4
GS		 3814 GV *gv = gv_fetchpv(name ? name : "__ANON__",
3815 GV_ADDMULTI | (block ? 0 : GV_NOINIT), SVt_PVCV);
2d8e6c8d 3816 char *ps = proto ? SvPVx(((SVOP*)proto)->op_sv, n_a) : Nullch;
a2008d6d 3817 register CV *cv=0;
a0d0e21e 3818 I32 ix;
79072805 3819
11343788 3820 if (o)
5dc0d613 3821 SAVEFREEOP(o);
3fe9a6f1 3822 if (proto)
3823 SAVEFREEOP(proto);
3824
55d729e4
GS		 3825 if (SvTYPE(gv) != SVt_PVGV) { /* Prototype now, and had
3826 maximum a prototype before. */
3827 if (SvTYPE(gv) > SVt_NULL) {
3828 if (!SvPOK((SV*)gv) && !(SvIOK((SV*)gv) && SvIVX((SV*)gv) == -1))
3829 warn("Runaway prototype");
3830 cv_ckproto((CV*)gv, NULL, ps);
3831 }
3832 if (ps)
3833 sv_setpv((SV*)gv, ps);
3834 else
3835 sv_setiv((SV*)gv, -1);
3280af22
NIS		 3836 SvREFCNT_dec(PL_compcv);
3837 cv = PL_compcv = NULL;
3838 PL_sub_generation++;
55d729e4
GS		 3839 goto noblock;
3840 }
3841
68dc0745 3842 if (!name || GvCVGEN(gv))
3843 cv = Nullcv;
3844 else if (cv = GvCV(gv)) {
3fe9a6f1 3845 cv_ckproto(cv, gv, ps);
68dc0745 3846 /* already defined (or promised)? */
3847 if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3848 SV* const_sv;
fe5e78ed 3849 bool const_changed = TRUE;
aa689395 3850 if (!block) {
3851 /* just a "sub foo;" when &foo is already defined */
3280af22 3852 SAVEFREESV(PL_compcv);
aa689395 3853 goto done;
3854 }
7bac28a0 3855 /* ahem, death to those who redefine active sort subs */
3280af22 3856 if (PL_curstackinfo->si_type == PERLSI_SORT && PL_sortcop == CvSTART(cv))
7bac28a0 3857 croak("Can't redefine active sort subroutine %s", name);
fe5e78ed
GS		 3858 if(const_sv = cv_const_sv(cv))
3859 const_changed = sv_cmp(const_sv, op_const_sv(block, Nullcv));
599cee73
PM		 3860 if ((const_sv && const_changed) || ckWARN(WARN_REDEFINE)
3861 && !(CvGV(cv) && GvSTASH(CvGV(cv))
2f34f9d4
IZ		 3862 && HvNAME(GvSTASH(CvGV(cv)))
3863 && strEQ(HvNAME(GvSTASH(CvGV(cv))),
3864 "autouse"))) {
3280af22
NIS		 3865 line_t oldline = PL_curcop->cop_line;
3866 PL_curcop->cop_line = PL_copline;
599cee73
PM		 3867 warner(WARN_REDEFINE,
3868 const_sv ? "Constant subroutine %s redefined"
3869 : "Subroutine %s redefined", name);
3280af22 3870 PL_curcop->cop_line = oldline;
79072805 3871 }
8990e307 3872 SvREFCNT_dec(cv);
68dc0745 3873 cv = Nullcv;
79072805
LW		 3874 }
3875 }
a0d0e21e 3876 if (cv) { /* must reuse cv if autoloaded */
4633a7c4 3877 cv_undef(cv);
3280af22
NIS		 3878 CvFLAGS(cv) = CvFLAGS(PL_compcv);
3879 CvOUTSIDE(cv) = CvOUTSIDE(PL_compcv);
3880 CvOUTSIDE(PL_compcv) = 0;
3881 CvPADLIST(cv) = CvPADLIST(PL_compcv);
3882 CvPADLIST(PL_compcv) = 0;
3883 if (SvREFCNT(PL_compcv) > 1) /* XXX Make closures transit through stub. */
3884 CvOUTSIDE(PL_compcv) = (CV*)SvREFCNT_inc((SV*)cv);
3885 SvREFCNT_dec(PL_compcv);
a0d0e21e
LW		 3886 }
3887 else {
3280af22 3888 cv = PL_compcv;
44a8e56a 3889 if (name) {
3890 GvCV(gv) = cv;
3891 GvCVGEN(gv) = 0;
3280af22 3892 PL_sub_generation++;
44a8e56a 3893 }
a0d0e21e 3894 }
44a8e56a 3895 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
3280af22
NIS		 3896 CvFILEGV(cv) = PL_curcop->cop_filegv;
3897 CvSTASH(cv) = PL_curstash;
11343788
MB		 3898#ifdef USE_THREADS
3899 CvOWNER(cv) = 0;
1cfa4ec7 3900 if (!CvMUTEXP(cv)) {
f6aaf501 3901 New(666, CvMUTEXP(cv), 1, perl_mutex);
1cfa4ec7
GS		 3902 MUTEX_INIT(CvMUTEXP(cv));
3903 }
11343788 3904#endif /* USE_THREADS */
8990e307 3905
3fe9a6f1 3906 if (ps)
3907 sv_setpv((SV*)cv, ps);
4633a7c4 3908
3280af22 3909 if (PL_error_count) {
c07a80fd 3910 op_free(block);
3911 block = Nullop;
68dc0745 3912 if (name) {
3913 char *s = strrchr(name, ':');
3914 s = s ? s+1 : name;
6d4c2119
CS		 3915 if (strEQ(s, "BEGIN")) {
3916 char *not_safe =
3917 "BEGIN not safe after errors--compilation aborted";
3280af22 3918 if (PL_in_eval & 4)
6d4c2119
CS		 3919 croak(not_safe);
3920 else {
3921 /* force display of errors found but not reported */
38a03e6e 3922 sv_catpv(ERRSV, not_safe);
2d8e6c8d 3923 croak("%s", SvPVx(ERRSV, n_a));
6d4c2119
CS		 3924 }
3925 }
68dc0745 3926 }
c07a80fd 3927 }
a0d0e21e 3928 if (!block) {
55d729e4 3929 noblock:
3280af22 3930 PL_copline = NOLINE;
a0d0e21e
LW		 3931 LEAVE_SCOPE(floor);
3932 return cv;
3933 }
3934
3280af22
NIS		 3935 if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad))
3936 av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv);
a0d0e21e 3937
54310121 3938 if (CvCLONE(cv)) {
3280af22
NIS		 3939 SV **namep = AvARRAY(PL_comppad_name);
3940 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
54310121 3941 SV *namesv;
3942
3280af22 3943 if (SvIMMORTAL(PL_curpad[ix]))
54310121 3944 continue;
3945 /*
3946 * The only things that a clonable function needs in its
3947 * pad are references to outer lexicals and anonymous subs.
3948 * The rest are created anew during cloning.
3949 */
3950 if (!((namesv = namep[ix]) != Nullsv &&
3280af22 3951 namesv != &PL_sv_undef &&
54310121 3952 (SvFAKE(namesv) ||
3953 *SvPVX(namesv) == '&')))
3954 {
3280af22
NIS		 3955 SvREFCNT_dec(PL_curpad[ix]);
3956 PL_curpad[ix] = Nullsv;
54310121 3957 }
3958 }
a0d0e21e 3959 }
54310121 3960 else {
3961 AV *av = newAV(); /* Will be @_ */
3962 av_extend(av, 0);
3280af22 3963 av_store(PL_comppad, 0, (SV*)av);
54310121 3964 AvFLAGS(av) = AVf_REIFY;
79072805 3965
3280af22
NIS		 3966 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
3967 if (SvIMMORTAL(PL_curpad[ix]))
54310121 3968 continue;
3280af22
NIS		 3969 if (!SvPADMY(PL_curpad[ix]))
3970 SvPADTMP_on(PL_curpad[ix]);
54310121 3971 }
3972 }
79072805 3973
a0d0e21e 3974 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
79072805
LW		 3975 CvSTART(cv) = LINKLIST(CvROOT(cv));
3976 CvROOT(cv)->op_next = 0;
3977 peep(CvSTART(cv));
93a17b20 3978
44a8e56a 3979 if (name) {
3980 char *s;
3981
3280af22 3982 if (PERLDB_SUBLINE && PL_curstash != PL_debstash) {
46fc3d4c 3983 SV *sv = NEWSV(0,0);
44a8e56a 3984 SV *tmpstr = sv_newmortal();
549bb64a 3985 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
44a8e56a 3986 CV *cv;
3987 HV *hv;
3988
51790459 3989 sv_setpvf(sv, "%_:%ld-%ld",
3280af22
NIS		 3990 GvSV(PL_curcop->cop_filegv),
3991 (long)PL_subline, (long)PL_curcop->cop_line);
44a8e56a 3992 gv_efullname3(tmpstr, gv, Nullch);
3280af22 3993 hv_store(GvHV(PL_DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 3994 hv = GvHVn(db_postponed);
9607fc9c 3995 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX(tmpstr), SvCUR(tmpstr))
3996 && (cv = GvCV(db_postponed))) {
44a8e56a 3997 dSP;
924508f0 3998 PUSHMARK(SP);
44a8e56a 3999 XPUSHs(tmpstr);
4000 PUTBACK;
4001 perl_call_sv((SV*)cv, G_DISCARD);
4002 }
4003 }
79072805 4004
44a8e56a 4005 if ((s = strrchr(name,':')))
28757baa 4006 s++;
4007 else
4008 s = name;
68dc0745 4009 if (strEQ(s, "BEGIN")) {
3280af22 4010 I32 oldscope = PL_scopestack_ix;
28757baa 4011 ENTER;
3280af22
NIS		 4012 SAVESPTR(PL_compiling.cop_filegv);
4013 SAVEI16(PL_compiling.cop_line);
4014 save_svref(&PL_rs);
4015 sv_setsv(PL_rs, PL_nrs);
28757baa 4016
3280af22
NIS		 4017 if (!PL_beginav)
4018 PL_beginav = newAV();
28757baa 4019 DEBUG_x( dump_sub(gv) );
3280af22 4020 av_push(PL_beginav, (SV *)cv);
28757baa 4021 GvCV(gv) = 0;
3280af22 4022 call_list(oldscope, PL_beginav);
a6006777 4023
3280af22 4024 PL_curcop = &PL_compiling;
a0ed51b3 4025 PL_compiling.op_private = PL_hints;
28757baa 4026 LEAVE;
4027 }
3280af22
NIS		 4028 else if (strEQ(s, "END") && !PL_error_count) {
4029 if (!PL_endav)
4030 PL_endav = newAV();
4031 av_unshift(PL_endav, 1);
4032 av_store(PL_endav, 0, (SV *)cv);
28757baa 4033 GvCV(gv) = 0;
4034 }
3280af22
NIS		 4035 else if (strEQ(s, "INIT") && !PL_error_count) {
4036 if (!PL_initav)
4037 PL_initav = newAV();
4038 av_push(PL_initav, SvREFCNT_inc(cv));
b7aad4fe 4039 GvCV(gv) = 0;
ae77835f 4040 }
79072805 4041 }
a6006777 4042
aa689395 4043 done:
3280af22 4044 PL_copline = NOLINE;
8990e307 4045 LEAVE_SCOPE(floor);
a0d0e21e 4046 return cv;
79072805
LW		 4047}
4048
b099ddc0 4049/* XXX unsafe for threads if eval_owner isn't held */
5476c433
JD		 4050void
4051newCONSTSUB(HV *stash, char *name, SV *sv)
4052{
4053 dTHR;
3280af22
NIS		 4054 U32 oldhints = PL_hints;
4055 HV *old_cop_stash = PL_curcop->cop_stash;
4056 HV *old_curstash = PL_curstash;
4057 line_t oldline = PL_curcop->cop_line;
4058 PL_curcop->cop_line = PL_copline;
5476c433 4059
3280af22 4060 PL_hints &= ~HINT_BLOCK_SCOPE;
5476c433 4061 if(stash)
3280af22 4062 PL_curstash = PL_curcop->cop_stash = stash;
5476c433
JD		 4063
4064 newSUB(
be24f278 4065 start_subparse(FALSE, 0),
5476c433 4066 newSVOP(OP_CONST, 0, newSVpv(name,0)),
6b88bc9c 4067 newSVOP(OP_CONST, 0, &PL_sv_no), /* SvPV(&PL_sv_no) == "" -- GMB */
5476c433
JD		 4068 newSTATEOP(0, Nullch, newSVOP(OP_CONST, 0, sv))
4069 );
4070
3280af22
NIS		 4071 PL_hints = oldhints;
4072 PL_curcop->cop_stash = old_cop_stash;
4073 PL_curstash = old_curstash;
4074 PL_curcop->cop_line = oldline;
5476c433
JD		 4075}
4076
57d3b86d 4077CV *
e3b8966e 4078newXS(char *name, void (*subaddr) (CV * _CPERLproto), char *filename)
a0d0e21e 4079{
11343788 4080 dTHR;
44a8e56a 4081 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 4082 register CV *cv;
44a8e56a 4083
4084 if (cv = (name ? GvCV(gv) : Nullcv)) {
4085 if (GvCVGEN(gv)) {
4086 /* just a cached method */
4087 SvREFCNT_dec(cv);
4088 cv = 0;
4089 }
4090 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
4091 /* already defined (or promised) */
599cee73 4092 if (ckWARN(WARN_REDEFINE) && !(CvGV(cv) && GvSTASH(CvGV(cv))
2f34f9d4
IZ		 4093 && HvNAME(GvSTASH(CvGV(cv)))
4094 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "autouse"))) {
3280af22 4095 line_t oldline = PL_curcop->cop_line;
51f6edd3
GS		 4096 if (PL_copline != NOLINE)
4097 PL_curcop->cop_line = PL_copline;
599cee73 4098 warner(WARN_REDEFINE, "Subroutine %s redefined",name);
3280af22 4099 PL_curcop->cop_line = oldline;
a0d0e21e
LW		 4100 }
4101 SvREFCNT_dec(cv);
4102 cv = 0;
79072805 4103 }
79072805 4104 }
44a8e56a 4105
4106 if (cv) /* must reuse cv if autoloaded */
4107 cv_undef(cv);
a0d0e21e
LW		 4108 else {
4109 cv = (CV*)NEWSV(1105,0);
4110 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 4111 if (name) {
4112 GvCV(gv) = cv;
4113 GvCVGEN(gv) = 0;
3280af22 4114 PL_sub_generation++;
44a8e56a 4115 }
a0d0e21e 4116 }
5196be3e 4117 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
11343788 4118#ifdef USE_THREADS
12ca11f6 4119 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 4120 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 4121 CvOWNER(cv) = 0;
4122#endif /* USE_THREADS */
79072805 4123 CvFILEGV(cv) = gv_fetchfile(filename);
a0d0e21e 4124 CvXSUB(cv) = subaddr;
44a8e56a 4125
28757baa 4126 if (name) {
4127 char *s = strrchr(name,':');
4128 if (s)
4129 s++;
4130 else
4131 s = name;
4132 if (strEQ(s, "BEGIN")) {
3280af22
NIS		 4133 if (!PL_beginav)
4134 PL_beginav = newAV();
4135 av_push(PL_beginav, (SV *)cv);
44a8e56a 4136 GvCV(gv) = 0;
28757baa 4137 }
4138 else if (strEQ(s, "END")) {
3280af22
NIS		 4139 if (!PL_endav)
4140 PL_endav = newAV();
4141 av_unshift(PL_endav, 1);
4142 av_store(PL_endav, 0, (SV *)cv);
44a8e56a 4143 GvCV(gv) = 0;
28757baa 4144 }
7d07dbc2 4145 else if (strEQ(s, "INIT")) {
3280af22
NIS		 4146 if (!PL_initav)
4147 PL_initav = newAV();
4148 av_push(PL_initav, (SV *)cv);
f8f842e4 4149 GvCV(gv) = 0;
ae77835f 4150 }
28757baa 4151 }
8990e307 4152 else
a5f75d66 4153 CvANON_on(cv);
44a8e56a 4154
a0d0e21e 4155 return cv;
79072805
LW		 4156}
4157
4158void
8ac85365 4159newFORM(I32 floor, OP *o, OP *block)
79072805 4160{
11343788 4161 dTHR;
79072805
LW		 4162 register CV *cv;
4163 char *name;
4164 GV *gv;
a0d0e21e 4165 I32 ix;
2d8e6c8d 4166 STRLEN n_a;
79072805 4167
11343788 4168 if (o)
2d8e6c8d 4169 name = SvPVx(cSVOPo->op_sv, n_a);
79072805
LW		 4170 else
4171 name = "STDOUT";
85e6fe83 4172 gv = gv_fetchpv(name,TRUE, SVt_PVFM);
a5f75d66 4173 GvMULTI_on(gv);
79072805 4174 if (cv = GvFORM(gv)) {
599cee73 4175 if (ckWARN(WARN_REDEFINE)) {
3280af22 4176 line_t oldline = PL_curcop->cop_line;
79072805 4177
3280af22 4178 PL_curcop->cop_line = PL_copline;
599cee73 4179 warner(WARN_REDEFINE, "Format %s redefined",name);
3280af22 4180 PL_curcop->cop_line = oldline;
79072805 4181 }
8990e307 4182 SvREFCNT_dec(cv);
79072805 4183 }
3280af22 4184 cv = PL_compcv;
79072805 4185 GvFORM(gv) = cv;
44a8e56a 4186 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
3280af22 4187 CvFILEGV(cv) = PL_curcop->cop_filegv;
79072805 4188
3280af22
NIS		 4189 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
4190 if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix]))
4191 SvPADTMP_on(PL_curpad[ix]);
a0d0e21e
LW		 4192 }
4193
79072805
LW		 4194 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
4195 CvSTART(cv) = LINKLIST(CvROOT(cv));
4196 CvROOT(cv)->op_next = 0;
4197 peep(CvSTART(cv));
11343788 4198 op_free(o);
3280af22 4199 PL_copline = NOLINE;
8990e307 4200 LEAVE_SCOPE(floor);
79072805
LW		 4201}
4202
4203OP *
8ac85365 4204newANONLIST(OP *o)
79072805 4205{
93a17b20 4206 return newUNOP(OP_REFGEN, 0,
11343788 4207 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 4208}
4209
4210OP *
8ac85365 4211newANONHASH(OP *o)
79072805 4212{
93a17b20 4213 return newUNOP(OP_REFGEN, 0,
11343788 4214 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 4215}
4216
4217OP *
8ac85365 4218newANONSUB(I32 floor, OP *proto, OP *block)
a0d0e21e
LW		 4219{
4220 return newUNOP(OP_REFGEN, 0,
4633a7c4 4221 newSVOP(OP_ANONCODE, 0, (SV*)newSUB(floor, 0, proto, block)));
79072805
LW		 4222}
4223
4224OP *
8ac85365 4225oopsAV(OP *o)
79072805 4226{
ed6116ce
LW		 4227 switch (o->op_type) {
4228 case OP_PADSV:
4229 o->op_type = OP_PADAV;
22c35a8c 4230 o->op_ppaddr = PL_ppaddr[OP_PADAV];
51e247a3 4231 return ref(o, OP_RV2AV);
ed6116ce
LW		 4232
4233 case OP_RV2SV:
79072805 4234 o->op_type = OP_RV2AV;
22c35a8c 4235 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 4236 ref(o, OP_RV2AV);
ed6116ce
LW		 4237 break;
4238
4239 default:
79072805 4240 warn("oops: oopsAV");
ed6116ce
LW		 4241 break;
4242 }
79072805
LW		 4243 return o;
4244}
4245
4246OP *
8ac85365 4247oopsHV(OP *o)
79072805 4248{
ed6116ce
LW		 4249 switch (o->op_type) {
4250 case OP_PADSV:
4251 case OP_PADAV:
4252 o->op_type = OP_PADHV;
22c35a8c 4253 o->op_ppaddr = PL_ppaddr[OP_PADHV];
51e247a3 4254 return ref(o, OP_RV2HV);
ed6116ce
LW		 4255
4256 case OP_RV2SV:
4257 case OP_RV2AV:
79072805 4258 o->op_type = OP_RV2HV;
22c35a8c 4259 o->op_ppaddr = PL_ppaddr[OP_RV2HV];
79072805 4260 ref(o, OP_RV2HV);
ed6116ce
LW		 4261 break;
4262
4263 default:
79072805 4264 warn("oops: oopsHV");
ed6116ce
LW		 4265 break;
4266 }
79072805
LW		 4267 return o;
4268}
4269
4270OP *
8ac85365 4271newAVREF(OP *o)
79072805 4272{
ed6116ce
LW		 4273 if (o->op_type == OP_PADANY) {
4274 o->op_type = OP_PADAV;
22c35a8c 4275 o->op_ppaddr = PL_ppaddr[OP_PADAV];
93a17b20 4276 return o;
ed6116ce 4277 }
79072805
LW		 4278 return newUNOP(OP_RV2AV, 0, scalar(o));
4279}
4280
4281OP *
8ac85365 4282newGVREF(I32 type, OP *o)
79072805 4283{
a0d0e21e
LW		 4284 if (type == OP_MAPSTART)
4285 return newUNOP(OP_NULL, 0, o);
748a9306 4286 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 4287}
4288
4289OP *
8ac85365 4290newHVREF(OP *o)
79072805 4291{
ed6116ce
LW		 4292 if (o->op_type == OP_PADANY) {
4293 o->op_type = OP_PADHV;
22c35a8c 4294 o->op_ppaddr = PL_ppaddr[OP_PADHV];
93a17b20 4295 return o;
ed6116ce 4296 }
79072805
LW		 4297 return newUNOP(OP_RV2HV, 0, scalar(o));
4298}
4299
4300OP *
8ac85365 4301oopsCV(OP *o)
79072805 4302{
463ee0b2 4303 croak("NOT IMPL LINE %d",__LINE__);
79072805
LW		 4304 /* STUB */
4305 return o;
4306}
4307
4308OP *
8ac85365 4309newCVREF(I32 flags, OP *o)
79072805 4310{
c07a80fd 4311 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 4312}
4313
4314OP *
8ac85365 4315newSVREF(OP *o)
79072805 4316{
ed6116ce
LW		 4317 if (o->op_type == OP_PADANY) {
4318 o->op_type = OP_PADSV;
22c35a8c 4319 o->op_ppaddr = PL_ppaddr[OP_PADSV];
93a17b20 4320 return o;
ed6116ce 4321 }
224a4551
MB		 4322 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
4323 o->op_flags |= OPpDONE_SVREF;
a863c7d1 4324 return o;
224a4551 4325 }
79072805
LW		 4326 return newUNOP(OP_RV2SV, 0, scalar(o));
4327}
4328
4329/* Check routines. */
4330
4331OP *
8ac85365 4332ck_anoncode(OP *o)
5f05dabc 4333{
178c6305
CS		 4334 PADOFFSET ix;
4335 SV* name;
4336
4337 name = NEWSV(1106,0);
4338 sv_upgrade(name, SVt_PVNV);
4339 sv_setpvn(name, "&", 1);
4340 SvIVX(name) = -1;
4341 SvNVX(name) = 1;
5dc0d613 4342 ix = pad_alloc(o->op_type, SVs_PADMY);
3280af22
NIS		 4343 av_store(PL_comppad_name, ix, name);
4344 av_store(PL_comppad, ix, cSVOPo->op_sv);
5dc0d613
MB		 4345 SvPADMY_on(cSVOPo->op_sv);
4346 cSVOPo->op_sv = Nullsv;
4347 cSVOPo->op_targ = ix;
4348 return o;
5f05dabc 4349}
4350
4351OP *
8ac85365 4352ck_bitop(OP *o)
55497cff 4353{
3280af22 4354 o->op_private = PL_hints;
5dc0d613 4355 return o;
55497cff 4356}
4357
4358OP *
8ac85365 4359ck_concat(OP *o)
79072805 4360{
11343788
MB		 4361 if (cUNOPo->op_first->op_type == OP_CONCAT)
4362 o->op_flags |= OPf_STACKED;
4363 return o;
79072805
LW		 4364}
4365
4366OP *
8ac85365 4367ck_spair(OP *o)
79072805 4368{
11343788 4369 if (o->op_flags & OPf_KIDS) {
79072805 4370 OP* newop;
a0d0e21e 4371 OP* kid;
5dc0d613
MB		 4372 OPCODE type = o->op_type;
4373 o = modkids(ck_fun(o), type);
11343788 4374 kid = cUNOPo->op_first;
a0d0e21e
LW		 4375 newop = kUNOP->op_first->op_sibling;
4376 if (newop &&
4377 (newop->op_sibling ||
22c35a8c 4378 !(PL_opargs[newop->op_type] & OA_RETSCALAR) ||
a0d0e21e
LW		 4379 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
4380 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
aeea060c 4381
11343788 4382 return o;
a0d0e21e
LW		 4383 }
4384 op_free(kUNOP->op_first);
4385 kUNOP->op_first = newop;
4386 }
22c35a8c 4387 o->op_ppaddr = PL_ppaddr[++o->op_type];
11343788 4388 return ck_fun(o);
a0d0e21e
LW		 4389}
4390
4391OP *
8ac85365 4392ck_delete(OP *o)
a0d0e21e 4393{
11343788 4394 o = ck_fun(o);
5dc0d613 4395 o->op_private = 0;
11343788
MB		 4396 if (o->op_flags & OPf_KIDS) {
4397 OP *kid = cUNOPo->op_first;
5f05dabc 4398 if (kid->op_type == OP_HSLICE)
5dc0d613 4399 o->op_private |= OPpSLICE;
5f05dabc 4400 else if (kid->op_type != OP_HELEM)
4401 croak("%s argument is not a HASH element or slice",
22c35a8c 4402 PL_op_desc[o->op_type]);
a0d0e21e 4403 null(kid);
79072805 4404 }
11343788 4405 return o;
79072805
LW		 4406}
4407
4408OP *
8ac85365 4409ck_eof(OP *o)
79072805 4410{
11343788 4411 I32 type = o->op_type;
79072805 4412
11343788
MB		 4413 if (o->op_flags & OPf_KIDS) {
4414 if (cLISTOPo->op_first->op_type == OP_STUB) {
4415 op_free(o);
4416 o = newUNOP(type, OPf_SPECIAL,
d58bf5aa 4417 newGVOP(OP_GV, 0, gv_fetchpv("main::ARGV", TRUE, SVt_PVAV)));
8990e307 4418 }
11343788 4419 return ck_fun(o);
79072805 4420 }
11343788 4421 return o;
79072805
LW		 4422}
4423
4424OP *
8ac85365 4425ck_eval(OP *o)
79072805 4426{
3280af22 4427 PL_hints |= HINT_BLOCK_SCOPE;
11343788
MB		 4428 if (o->op_flags & OPf_KIDS) {
4429 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 4430
93a17b20 4431 if (!kid) {
11343788
MB		 4432 o->op_flags &= ~OPf_KIDS;
4433 null(o);
79072805
LW		 4434 }
4435 else if (kid->op_type == OP_LINESEQ) {
4436 LOGOP *enter;
4437
11343788
MB		 4438 kid->op_next = o->op_next;
4439 cUNOPo->op_first = 0;
4440 op_free(o);
79072805
LW		 4441
4442 Newz(1101, enter, 1, LOGOP);
4443 enter->op_type = OP_ENTERTRY;
22c35a8c 4444 enter->op_ppaddr = PL_ppaddr[OP_ENTERTRY];
79072805
LW		 4445 enter->op_private = 0;
4446
4447 /* establish postfix order */
4448 enter->op_next = (OP*)enter;
4449
11343788
MB		 4450 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
4451 o->op_type = OP_LEAVETRY;
22c35a8c 4452 o->op_ppaddr = PL_ppaddr[OP_LEAVETRY];
11343788
MB		 4453 enter->op_other = o;
4454 return o;
79072805 4455 }
c7cc6f1c 4456 else
473986ff 4457 scalar((OP*)kid);
79072805
LW		 4458 }
4459 else {
11343788 4460 op_free(o);
54b9620d 4461 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
79072805 4462 }
3280af22 4463 o->op_targ = (PADOFFSET)PL_hints;
11343788 4464 return o;
79072805
LW		 4465}
4466
4467OP *
8ac85365 4468ck_exec(OP *o)
79072805
LW		 4469{
4470 OP *kid;
11343788
MB		 4471 if (o->op_flags & OPf_STACKED) {
4472 o = ck_fun(o);
4473 kid = cUNOPo->op_first->op_sibling;
8990e307
LW		 4474 if (kid->op_type == OP_RV2GV)
4475 null(kid);
79072805 4476 }
463ee0b2 4477 else
11343788
MB		 4478 o = listkids(o);
4479 return o;
79072805
LW		 4480}
4481
4482OP *
8ac85365 4483ck_exists(OP *o)
5f05dabc 4484{
5196be3e
MB		 4485 o = ck_fun(o);
4486 if (o->op_flags & OPf_KIDS) {
4487 OP *kid = cUNOPo->op_first;
5f05dabc 4488 if (kid->op_type != OP_HELEM)
22c35a8c 4489 croak("%s argument is not a HASH element", PL_op_desc[o->op_type]);
5f05dabc 4490 null(kid);
4491 }
5196be3e 4492 return o;
5f05dabc 4493}
4494
22c35a8c 4495#if 0
5f05dabc 4496OP *
8ac85365 4497ck_gvconst(register OP *o)
79072805
LW		 4498{
4499 o = fold_constants(o);
4500 if (o->op_type == OP_CONST)
4501 o->op_type = OP_GV;
4502 return o;
4503}
22c35a8c 4504#endif
79072805
LW		 4505
4506OP *
8ac85365 4507ck_rvconst(register OP *o)
79072805 4508{
11343788
MB		 4509 dTHR;
4510 SVOP *kid = (SVOP*)cUNOPo->op_first;
85e6fe83 4511
3280af22 4512 o->op_private |= (PL_hints & HINT_STRICT_REFS);
79072805 4513 if (kid->op_type == OP_CONST) {
44a8e56a 4514 char *name;
4515 int iscv;
4516 GV *gv;
779c5bc9 4517 SV *kidsv = kid->op_sv;
2d8e6c8d 4518 STRLEN n_a;
44a8e56a 4519
779c5bc9
GS		 4520 /* Is it a constant from cv_const_sv()? */
4521 if (SvROK(kidsv) && SvREADONLY(kidsv)) {
4522 SV *rsv = SvRV(kidsv);
4523 int svtype = SvTYPE(rsv);
4524 char *badtype = Nullch;
4525
4526 switch (o->op_type) {
4527 case OP_RV2SV:
4528 if (svtype > SVt_PVMG)
4529 badtype = "a SCALAR";
4530 break;
4531 case OP_RV2AV:
4532 if (svtype != SVt_PVAV)
4533 badtype = "an ARRAY";
4534 break;
4535 case OP_RV2HV:
4536 if (svtype != SVt_PVHV) {
4537 if (svtype == SVt_PVAV) { /* pseudohash? */
4538 SV **ksv = av_fetch((AV*)rsv, 0, FALSE);
4539 if (ksv && SvROK(*ksv)
4540 && SvTYPE(SvRV(*ksv)) == SVt_PVHV)
4541 {
4542 break;
4543 }
4544 }
4545 badtype = "a HASH";
4546 }
4547 break;
4548 case OP_RV2CV:
4549 if (svtype != SVt_PVCV)
4550 badtype = "a CODE";
4551 break;
4552 }
4553 if (badtype)
4554 croak("Constant is not %s reference", badtype);
4555 return o;
4556 }
2d8e6c8d 4557 name = SvPV(kidsv, n_a);
3280af22 4558 if ((PL_hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
44a8e56a 4559 char *badthing = Nullch;
5dc0d613 4560 switch (o->op_type) {
44a8e56a 4561 case OP_RV2SV:
4562 badthing = "a SCALAR";
4563 break;
4564 case OP_RV2AV:
4565 badthing = "an ARRAY";
4566 break;
4567 case OP_RV2HV:
4568 badthing = "a HASH";
4569 break;
4570 }
4571 if (badthing)
4572 croak(
4573 "Can't use bareword (\"%s\") as %s ref while \"strict refs\" in use",
4574 name, badthing);
4575 }
93233ece
CS		 4576 /*
4577 * This is a little tricky. We only want to add the symbol if we
4578 * didn't add it in the lexer. Otherwise we get duplicate strict
4579 * warnings. But if we didn't add it in the lexer, we must at
4580 * least pretend like we wanted to add it even if it existed before,
4581 * or we get possible typo warnings. OPpCONST_ENTERED says
4582 * whether the lexer already added THIS instance of this symbol.
4583 */
5196be3e 4584 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 4585 do {
44a8e56a 4586 gv = gv_fetchpv(name,
748a9306 4587 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 4588 iscv
4589 ? SVt_PVCV
11343788 4590 : o->op_type == OP_RV2SV
a0d0e21e 4591 ? SVt_PV
11343788 4592 : o->op_type == OP_RV2AV
a0d0e21e 4593 ? SVt_PVAV
11343788 4594 : o->op_type == OP_RV2HV
a0d0e21e
LW		 4595 ? SVt_PVHV
4596 : SVt_PVGV);
93233ece
CS		 4597 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
4598 if (gv) {
4599 kid->op_type = OP_GV;
4600 SvREFCNT_dec(kid->op_sv);
4601 kid->op_sv = SvREFCNT_inc(gv);
a0d0e21e 4602 }
79072805 4603 }
11343788 4604 return o;
79072805
LW		 4605}
4606
4607OP *
8ac85365 4608ck_ftst(OP *o)
79072805 4609{
11343788
MB		 4610 dTHR;
4611 I32 type = o->op_type;
79072805 4612
11343788
MB		 4613 if (o->op_flags & OPf_REF)
4614 return o;
79072805 4615
108ed793 4616 if (o->op_flags & OPf_KIDS && cUNOPo->op_first->op_type != OP_STUB) {
11343788 4617 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805
LW		 4618
4619 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
2d8e6c8d 4620 STRLEN n_a;
a0d0e21e 4621 OP *newop = newGVOP(type, OPf_REF,
2d8e6c8d 4622 gv_fetchpv(SvPVx(kid->op_sv, n_a), TRUE, SVt_PVIO));
11343788 4623 op_free(o);
79072805
LW		 4624 return newop;
4625 }
4626 }
4627 else {
11343788 4628 op_free(o);
79072805 4629 if (type == OP_FTTTY)
fb73857a 4630 return newGVOP(type, OPf_REF, gv_fetchpv("main::STDIN", TRUE,
85e6fe83 4631 SVt_PVIO));
79072805 4632 else
54b9620d 4633 return newUNOP(type, 0, newDEFSVOP());
79072805 4634 }
11343788 4635 return o;
79072805
LW		 4636}
4637
4638OP *
8ac85365 4639ck_fun(OP *o)
79072805 4640{
11343788 4641 dTHR;
79072805
LW		 4642 register OP *kid;
4643 OP **tokid;
4644 OP *sibl;
4645 I32 numargs = 0;
11343788 4646 int type = o->op_type;
22c35a8c 4647 register I32 oa = PL_opargs[type] >> OASHIFT;
aeea060c 4648
11343788 4649 if (o->op_flags & OPf_STACKED) {
79072805
LW		 4650 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
4651 oa &= ~OA_OPTIONAL;
4652 else
11343788 4653 return no_fh_allowed(o);
79072805
LW		 4654 }
4655
11343788 4656 if (o->op_flags & OPf_KIDS) {
2d8e6c8d 4657 STRLEN n_a;
11343788
MB		 4658 tokid = &cLISTOPo->op_first;
4659 kid = cLISTOPo->op_first;
8990e307
LW		 4660 if (kid->op_type == OP_PUSHMARK ||
4661 kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK)
4662 {
79072805
LW		 4663 tokid = &kid->op_sibling;
4664 kid = kid->op_sibling;
4665 }
22c35a8c 4666 if (!kid && PL_opargs[type] & OA_DEFGV)
54b9620d 4667 *tokid = kid = newDEFSVOP();
79072805
LW		 4668
4669 while (oa && kid) {
4670 numargs++;
4671 sibl = kid->op_sibling;
4672 switch (oa & 7) {
4673 case OA_SCALAR:
62c18ce2
GS		 4674 /* list seen where single (scalar) arg expected? */
4675 if (numargs == 1 && !(oa >> 4)
4676 && kid->op_type == OP_LIST && type != OP_SCALAR)
4677 {
4678 return too_many_arguments(o,PL_op_desc[type]);
4679 }
79072805
LW		 4680 scalar(kid);
4681 break;
4682 case OA_LIST:
4683 if (oa < 16) {
4684 kid = 0;
4685 continue;
4686 }
4687 else
4688 list(kid);
4689 break;
4690 case OA_AVREF:
4691 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 4692 (kid->op_private & OPpCONST_BARE))
4693 {
2d8e6c8d 4694 char *name = SvPVx(((SVOP*)kid)->op_sv, n_a);
79072805 4695 OP *newop = newAVREF(newGVOP(OP_GV, 0,
85e6fe83 4696 gv_fetchpv(name, TRUE, SVt_PVAV) ));
599cee73
PM		 4697 if (ckWARN(WARN_SYNTAX))
4698 warner(WARN_SYNTAX,
4699 "Array @%s missing the @ in argument %ld of %s()",
22c35a8c 4700 name, (long)numargs, PL_op_desc[type]);
79072805
LW		 4701 op_free(kid);
4702 kid = newop;
4703 kid->op_sibling = sibl;
4704 *tokid = kid;
4705 }
8990e307 4706 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
35cd451c 4707 bad_type(numargs, "array", PL_op_desc[type], kid);
a0d0e21e 4708 mod(kid, type);
79072805
LW		 4709 break;
4710 case OA_HVREF:
4711 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 4712 (kid->op_private & OPpCONST_BARE))
4713 {
2d8e6c8d 4714 char *name = SvPVx(((SVOP*)kid)->op_sv, n_a);
79072805 4715 OP *newop = newHVREF(newGVOP(OP_GV, 0,
85e6fe83 4716 gv_fetchpv(name, TRUE, SVt_PVHV) ));
599cee73
PM		 4717 if (ckWARN(WARN_SYNTAX))
4718 warner(WARN_SYNTAX,
4719 "Hash %%%s missing the %% in argument %ld of %s()",
22c35a8c 4720 name, (long)numargs, PL_op_desc[type]);
79072805
LW		 4721 op_free(kid);
4722 kid = newop;
4723 kid->op_sibling = sibl;
4724 *tokid = kid;
4725 }
8990e307 4726 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
35cd451c 4727 bad_type(numargs, "hash", PL_op_desc[type], kid);
a0d0e21e 4728 mod(kid, type);
79072805
LW		 4729 break;
4730 case OA_CVREF:
4731 {
a0d0e21e 4732 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 4733 kid->op_sibling = 0;
4734 linklist(kid);
4735 newop->op_next = newop;
4736 kid = newop;
4737 kid->op_sibling = sibl;
4738 *tokid = kid;
4739 }
4740 break;
4741 case OA_FILEREF:
c340be78 4742 if (kid->op_type != OP_GV && kid->op_type != OP_RV2GV) {
79072805 4743 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 4744 (kid->op_private & OPpCONST_BARE))
4745 {
79072805 4746 OP *newop = newGVOP(OP_GV, 0,
2d8e6c8d 4747 gv_fetchpv(SvPVx(((SVOP*)kid)->op_sv, n_a), TRUE,
85e6fe83 4748 SVt_PVIO) );
79072805
LW		 4749 op_free(kid);
4750 kid = newop;
4751 }
1ea32a52
GS		 4752 else if (kid->op_type == OP_READLINE) {
4753 /* neophyte patrol: open(<FH>), close(<FH>) etc. */
4754 bad_type(numargs, "HANDLE", PL_op_desc[o->op_type], kid);
4755 }
79072805 4756 else {
35cd451c
GS		 4757 I32 flags = OPf_SPECIAL;
4758 /* is this op a FH constructor? */
4759 if (is_handle_constructor(o,numargs))
4760 flags = 0;
79072805 4761 kid->op_sibling = 0;
35cd451c 4762 kid = newUNOP(OP_RV2GV, flags, scalar(kid));
79072805
LW		 4763 }
4764 kid->op_sibling = sibl;
4765 *tokid = kid;
4766 }
4767 scalar(kid);
4768 break;
4769 case OA_SCALARREF:
a0d0e21e 4770 mod(scalar(kid), type);
79072805
LW		 4771 break;
4772 }
4773 oa >>= 4;
4774 tokid = &kid->op_sibling;
4775 kid = kid->op_sibling;
4776 }
11343788 4777 o->op_private |= numargs;
79072805 4778 if (kid)
22c35a8c 4779 return too_many_arguments(o,PL_op_desc[o->op_type]);
11343788 4780 listkids(o);
79072805 4781 }
22c35a8c 4782 else if (PL_opargs[type] & OA_DEFGV) {
11343788 4783 op_free(o);
54b9620d 4784 return newUNOP(type, 0, newDEFSVOP());
a0d0e21e
LW		 4785 }
4786
79072805
LW		 4787 if (oa) {
4788 while (oa & OA_OPTIONAL)
4789 oa >>= 4;
4790 if (oa && oa != OA_LIST)
22c35a8c 4791 return too_few_arguments(o,PL_op_desc[o->op_type]);
79072805 4792 }
11343788 4793 return o;
79072805
LW		 4794}
4795
4796OP *
8ac85365 4797ck_glob(OP *o)
79072805 4798{
fb73857a 4799 GV *gv;
4800
1f2bfc8a 4801 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 4802 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 4803
4804 if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV)) && GvIMPORTED_CV(gv)))
4805 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
b1cb66bf 4806
4807 if (gv && GvIMPORTED_CV(gv)) {
5196be3e 4808 append_elem(OP_GLOB, o,
80252599 4809 newSVOP(OP_CONST, 0, newSViv(PL_glob_index++)));
1f2bfc8a 4810 o->op_type = OP_LIST;
22c35a8c 4811 o->op_ppaddr = PL_ppaddr[OP_LIST];
1f2bfc8a 4812 cLISTOPo->op_first->op_type = OP_PUSHMARK;
22c35a8c 4813 cLISTOPo->op_first->op_ppaddr = PL_ppaddr[OP_PUSHMARK];
1f2bfc8a 4814 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 4815 append_elem(OP_LIST, o,
1f2bfc8a
MB		 4816 scalar(newUNOP(OP_RV2CV, 0,
4817 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 4818 o = newUNOP(OP_NULL, 0, ck_subr(o));
4819 o->op_targ = OP_GLOB; /* hint at what it used to be */
4820 return o;
b1cb66bf 4821 }
4822 gv = newGVgen("main");
a0d0e21e 4823 gv_IOadd(gv);
11343788
MB		 4824 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
4825 scalarkids(o);
4826 return ck_fun(o);
79072805
LW		 4827}
4828
4829OP *
8ac85365 4830ck_grep(OP *o)
79072805
LW		 4831{
4832 LOGOP *gwop;
4833 OP *kid;
11343788 4834 OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
79072805 4835
22c35a8c 4836 o->op_ppaddr = PL_ppaddr[OP_GREPSTART];
a0d0e21e 4837 Newz(1101, gwop, 1, LOGOP);
aeea060c 4838
11343788 4839 if (o->op_flags & OPf_STACKED) {
a0d0e21e 4840 OP* k;
11343788
MB		 4841 o = ck_sort(o);
4842 kid = cLISTOPo->op_first->op_sibling;
4843 for (k = cLISTOPo->op_first->op_sibling->op_next; k; k = k->op_next) {
a0d0e21e
LW		 4844 kid = k;
4845 }
4846 kid->op_next = (OP*)gwop;
11343788 4847 o->op_flags &= ~OPf_STACKED;
93a17b20 4848 }
11343788 4849 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 4850 if (type == OP_MAPWHILE)
4851 list(kid);
4852 else
4853 scalar(kid);
11343788 4854 o = ck_fun(o);
3280af22 4855 if (PL_error_count)
11343788 4856 return o;
aeea060c 4857 kid = cLISTOPo->op_first->op_sibling;
79072805 4858 if (kid->op_type != OP_NULL)
463ee0b2 4859 croak("panic: ck_grep");
79072805
LW		 4860 kid = kUNOP->op_first;
4861
a0d0e21e 4862 gwop->op_type = type;
22c35a8c 4863 gwop->op_ppaddr = PL_ppaddr[type];
11343788 4864 gwop->op_first = listkids(o);
79072805
LW		 4865 gwop->op_flags |= OPf_KIDS;
4866 gwop->op_private = 1;
4867 gwop->op_other = LINKLIST(kid);
a0d0e21e 4868 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
79072805
LW		 4869 kid->op_next = (OP*)gwop;
4870
11343788 4871 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 4872 if (!kid || !kid->op_sibling)
22c35a8c 4873 return too_few_arguments(o,PL_op_desc[o->op_type]);
a0d0e21e
LW		 4874 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
4875 mod(kid, OP_GREPSTART);
4876
79072805
LW		 4877 return (OP*)gwop;
4878}
4879
4880OP *
8ac85365 4881ck_index(OP *o)
79072805 4882{
11343788
MB		 4883 if (o->op_flags & OPf_KIDS) {
4884 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
0b71040e
LW		 4885 if (kid)
4886 kid = kid->op_sibling; /* get past "big" */
79072805 4887 if (kid && kid->op_type == OP_CONST)
2779dcf1 4888 fbm_compile(((SVOP*)kid)->op_sv, 0);
79072805 4889 }
11343788 4890 return ck_fun(o);
79072805
LW		 4891}
4892
4893OP *
8ac85365 4894ck_lengthconst(OP *o)
79072805
LW		 4895{
4896 /* XXX length optimization goes here */
11343788 4897 return ck_fun(o);
79072805
LW		 4898}
4899
4900OP *
8ac85365 4901ck_lfun(OP *o)
79072805 4902{
5dc0d613
MB		 4903 OPCODE type = o->op_type;
4904 return modkids(ck_fun(o), type);
79072805
LW		 4905}
4906
4907OP *
8ac85365 4908ck_rfun(OP *o)
8990e307 4909{
5dc0d613
MB		 4910 OPCODE type = o->op_type;
4911 return refkids(ck_fun(o), type);
8990e307
LW		 4912}
4913
4914OP *
8ac85365 4915ck_listiob(OP *o)
79072805
LW		 4916{
4917 register OP *kid;
aeea060c 4918
11343788 4919 kid = cLISTOPo->op_first;
79072805 4920 if (!kid) {
11343788
MB		 4921 o = force_list(o);
4922 kid = cLISTOPo->op_first;
79072805
LW		 4923 }
4924 if (kid->op_type == OP_PUSHMARK)
4925 kid = kid->op_sibling;
11343788 4926 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 4927 kid = kid->op_sibling;
4928 else if (kid && !kid->op_sibling) { /* print HANDLE; */
4929 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 4930 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 4931 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 4932 cLISTOPo->op_first->op_sibling = kid;
4933 cLISTOPo->op_last = kid;
79072805
LW		 4934 kid = kid->op_sibling;
4935 }
4936 }
4937
4938 if (!kid)
54b9620d 4939 append_elem(o->op_type, o, newDEFSVOP());
79072805 4940
5dc0d613 4941 o = listkids(o);
bbce6d69 4942
5dc0d613 4943 o->op_private = 0;
36477c24 4944#ifdef USE_LOCALE
3280af22 4945 if (PL_hints & HINT_LOCALE)
5dc0d613 4946 o->op_private |= OPpLOCALE;
bbce6d69 4947#endif
4948
5dc0d613 4949 return o;
bbce6d69 4950}
4951
4952OP *
8ac85365 4953ck_fun_locale(OP *o)
bbce6d69 4954{
5dc0d613 4955 o = ck_fun(o);
bbce6d69 4956
5dc0d613 4957 o->op_private = 0;
36477c24 4958#ifdef USE_LOCALE
3280af22 4959 if (PL_hints & HINT_LOCALE)
5dc0d613 4960 o->op_private |= OPpLOCALE;
bbce6d69 4961#endif
4962
5dc0d613 4963 return o;
bbce6d69 4964}
4965
4966OP *
8ac85365 4967ck_scmp(OP *o)
bbce6d69 4968{
5dc0d613 4969 o->op_private = 0;
36477c24 4970#ifdef USE_LOCALE
3280af22 4971 if (PL_hints & HINT_LOCALE)
5dc0d613 4972 o->op_private |= OPpLOCALE;
bbce6d69 4973#endif
36477c24 4974
5dc0d613 4975 return o;
79072805
LW		 4976}
4977
4978OP *
8ac85365 4979ck_match(OP *o)
79072805 4980{
5dc0d613 4981 o->op_private |= OPpRUNTIME;
11343788 4982 return o;
79072805
LW		 4983}
4984
4985OP *
8ac85365 4986ck_null(OP *o)
79072805 4987{
11343788 4988 return o;
79072805
LW		 4989}
4990
4991OP *
8ac85365 4992ck_repeat(OP *o)
79072805 4993{
11343788
MB		 4994 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
4995 o->op_private |= OPpREPEAT_DOLIST;
4996 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 4997 }
4998 else
11343788
MB		 4999 scalar(o);
5000 return o;
79072805
LW		 5001}
5002
5003OP *
8ac85365 5004ck_require(OP *o)
8990e307 5005{
11343788
MB		 5006 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
5007 SVOP *kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 5008
5009 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
8990e307 5010 char *s;
a0d0e21e
LW		 5011 for (s = SvPVX(kid->op_sv); *s; s++) {
5012 if (*s == ':' && s[1] == ':') {
5013 *s = '/';
1aef975c 5014 Move(s+2, s+1, strlen(s+2)+1, char);
a0d0e21e
LW		 5015 --SvCUR(kid->op_sv);
5016 }
8990e307 5017 }
a0d0e21e 5018 sv_catpvn(kid->op_sv, ".pm", 3);
8990e307
LW		 5019 }
5020 }
11343788 5021 return ck_fun(o);
8990e307
LW		 5022}
5023
22c35a8c 5024#if 0
8990e307 5025OP *
8ac85365 5026ck_retarget(OP *o)
79072805 5027{
463ee0b2 5028 croak("NOT IMPL LINE %d",__LINE__);
79072805 5029 /* STUB */
11343788 5030 return o;
79072805 5031}
22c35a8c 5032#endif
79072805
LW		 5033
5034OP *
8ac85365 5035ck_select(OP *o)
79072805 5036{
c07a80fd 5037 OP* kid;
11343788
MB		 5038 if (o->op_flags & OPf_KIDS) {
5039 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 5040 if (kid && kid->op_sibling) {
11343788 5041 o->op_type = OP_SSELECT;
22c35a8c 5042 o->op_ppaddr = PL_ppaddr[OP_SSELECT];
11343788
MB		 5043 o = ck_fun(o);
5044 return fold_constants(o);
79072805
LW		 5045 }
5046 }
11343788
MB		 5047 o = ck_fun(o);
5048 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 5049 if (kid && kid->op_type == OP_RV2GV)
5050 kid->op_private &= ~HINT_STRICT_REFS;
11343788 5051 return o;
79072805
LW		 5052}
5053
5054OP *
8ac85365 5055ck_shift(OP *o)
79072805 5056{
11343788 5057 I32 type = o->op_type;
79072805 5058
11343788 5059 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2
MB		 5060 OP *argop;
5061
11343788 5062 op_free(o);
6d4ff0d2 5063#ifdef USE_THREADS
533c011a 5064 if (!CvUNIQUE(PL_compcv)) {
6d4ff0d2 5065 argop = newOP(OP_PADAV, OPf_REF);
6b88bc9c 5066 argop->op_targ = 0; /* PL_curpad[0] is @_ */
6d4ff0d2
MB		 5067 }
5068 else {
5069 argop = newUNOP(OP_RV2AV, 0,
5070 scalar(newGVOP(OP_GV, 0,
5071 gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
5072 }
5073#else
5074 argop = newUNOP(OP_RV2AV, 0,
3280af22
NIS		 5075 scalar(newGVOP(OP_GV, 0, !CvUNIQUE(PL_compcv) ?
5076 PL_defgv : gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
6d4ff0d2
MB		 5077#endif /* USE_THREADS */
5078 return newUNOP(type, 0, scalar(argop));
79072805 5079 }
11343788 5080 return scalar(modkids(ck_fun(o), type));
79072805
LW		 5081}
5082
5083OP *
8ac85365 5084ck_sort(OP *o)
79072805 5085{
5dc0d613 5086 o->op_private = 0;
36477c24 5087#ifdef USE_LOCALE
3280af22 5088 if (PL_hints & HINT_LOCALE)
5dc0d613 5089 o->op_private |= OPpLOCALE;
bbce6d69 5090#endif
5091
9c007264 5092 if (o->op_flags & OPf_STACKED)
51a19bc0 5093 simplify_sort(o);
9c007264 5094 if (o->op_flags & OPf_STACKED) { /* may have been cleared */
11343788 5095 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
463ee0b2
LW		 5096 OP *k;
5097 kid = kUNOP->op_first; /* get past rv2gv */
79072805 5098
463ee0b2 5099 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 5100 linklist(kid);
463ee0b2
LW		 5101 if (kid->op_type == OP_SCOPE) {
5102 k = kid->op_next;
5103 kid->op_next = 0;
79072805 5104 }
463ee0b2 5105 else if (kid->op_type == OP_LEAVE) {
11343788 5106 if (o->op_type == OP_SORT) {
748a9306
LW		 5107 null(kid); /* wipe out leave */
5108 kid->op_next = kid;
463ee0b2 5109
748a9306
LW		 5110 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
5111 if (k->op_next == kid)
5112 k->op_next = 0;
5113 }
463ee0b2 5114 }
748a9306
LW		 5115 else
5116 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 5117 k = kLISTOP->op_first;
463ee0b2 5118 }
a0d0e21e
LW		 5119 peep(k);
5120
11343788 5121 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
8990e307 5122 null(kid); /* wipe out rv2gv */
11343788 5123 if (o->op_type == OP_SORT)
a0d0e21e
LW		 5124 kid->op_next = kid;
5125 else
5126 kid->op_next = k;
11343788 5127 o->op_flags |= OPf_SPECIAL;
79072805 5128 }
c6e96bcb
GS		 5129 else if (kid->op_type == OP_RV2SV || kid->op_type == OP_PADSV)
5130 null(cLISTOPo->op_first->op_sibling);
79072805 5131 }
bbce6d69 5132
11343788 5133 return o;
79072805 5134}
bda4119b
GS		 5135
5136STATIC void
9c007264
JH		 5137simplify_sort(OP *o)
5138{
51a19bc0 5139 dTHR;
9c007264
JH		 5140 register OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
5141 OP *k;
5142 int reversed;
5143 if (!(o->op_flags & OPf_STACKED))
5144 return;
5145 kid = kUNOP->op_first; /* get past rv2gv */
5146 if (kid->op_type != OP_SCOPE)
5147 return;
5148 kid = kLISTOP->op_last; /* get past scope */
5149 switch(kid->op_type) {
5150 case OP_NCMP:
5151 case OP_I_NCMP:
5152 case OP_SCMP:
5153 break;
5154 default:
5155 return;
5156 }
5157 k = kid; /* remember this node*/
5158 if (kBINOP->op_first->op_type != OP_RV2SV)
5159 return;
5160 kid = kBINOP->op_first; /* get past cmp */
5161 if (kUNOP->op_first->op_type != OP_GV)
5162 return;
5163 kid = kUNOP->op_first; /* get past rv2sv */
5164 if (GvSTASH(kGVOP->op_gv) != PL_curstash)
5165 return;
5166 if (strEQ(GvNAME(kGVOP->op_gv), "a"))
5167 reversed = 0;
5168 else if(strEQ(GvNAME(kGVOP->op_gv), "b"))
5169 reversed = 1;
5170 else
5171 return;
5172 kid = k; /* back to cmp */
5173 if (kBINOP->op_last->op_type != OP_RV2SV)
5174 return;
5175 kid = kBINOP->op_last; /* down to 2nd arg */
5176 if (kUNOP->op_first->op_type != OP_GV)
5177 return;
5178 kid = kUNOP->op_first; /* get past rv2sv */
5179 if (GvSTASH(kGVOP->op_gv) != PL_curstash
5180 || ( reversed
5181 ? strNE(GvNAME(kGVOP->op_gv), "a")
5182 : strNE(GvNAME(kGVOP->op_gv), "b")))
5183 return;
5184 o->op_flags &= ~(OPf_STACKED | OPf_SPECIAL);
5185 if (reversed)
5186 o->op_private |= OPpSORT_REVERSE;
5187 if (k->op_type == OP_NCMP)
5188 o->op_private |= OPpSORT_NUMERIC;
5189 if (k->op_type == OP_I_NCMP)
5190 o->op_private |= OPpSORT_NUMERIC | OPpSORT_INTEGER;
5191 op_free(cLISTOPo->op_first->op_sibling); /* delete comparison block */
5192 cLISTOPo->op_first->op_sibling = cLISTOPo->op_last;
5193 cLISTOPo->op_children = 1;
5194}
79072805
LW		 5195
5196OP *
8ac85365 5197ck_split(OP *o)
79072805
LW		 5198{
5199 register OP *kid;
aeea060c 5200
11343788
MB		 5201 if (o->op_flags & OPf_STACKED)
5202 return no_fh_allowed(o);
79072805 5203
11343788 5204 kid = cLISTOPo->op_first;
8990e307 5205 if (kid->op_type != OP_NULL)
463ee0b2 5206 croak("panic: ck_split");
8990e307 5207 kid = kid->op_sibling;
11343788
MB		 5208 op_free(cLISTOPo->op_first);
5209 cLISTOPo->op_first = kid;
85e6fe83 5210 if (!kid) {
11343788
MB		 5211 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpv(" ", 1));
5212 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 5213 }
79072805
LW		 5214
5215 if (kid->op_type != OP_MATCH) {
5216 OP *sibl = kid->op_sibling;
463ee0b2 5217 kid->op_sibling = 0;
79072805 5218 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, Nullop);
11343788
MB		 5219 if (cLISTOPo->op_first == cLISTOPo->op_last)
5220 cLISTOPo->op_last = kid;
5221 cLISTOPo->op_first = kid;
79072805
LW		 5222 kid->op_sibling = sibl;
5223 }
5224
5225 kid->op_type = OP_PUSHRE;
22c35a8c 5226 kid->op_ppaddr = PL_ppaddr[OP_PUSHRE];
79072805
LW		 5227 scalar(kid);
5228
5229 if (!kid->op_sibling)
54b9620d 5230 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 5231
5232 kid = kid->op_sibling;
5233 scalar(kid);
5234
5235 if (!kid->op_sibling)
11343788 5236 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
79072805
LW		 5237
5238 kid = kid->op_sibling;
5239 scalar(kid);
5240
5241 if (kid->op_sibling)
22c35a8c 5242 return too_many_arguments(o,PL_op_desc[o->op_type]);
79072805 5243
11343788 5244 return o;
79072805
LW		 5245}
5246
5247OP *
8ac85365 5248ck_subr(OP *o)
79072805 5249{
11343788
MB		 5250 dTHR;
5251 OP *prev = ((cUNOPo->op_first->op_sibling)
5252 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
5253 OP *o2 = prev->op_sibling;
4633a7c4
LW		 5254 OP *cvop;
5255 char *proto = 0;
5256 CV *cv = 0;
46fc3d4c 5257 GV *namegv = 0;
4633a7c4
LW		 5258 int optional = 0;
5259 I32 arg = 0;
2d8e6c8d 5260 STRLEN n_a;
4633a7c4 5261
11343788 5262 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 5263 if (cvop->op_type == OP_RV2CV) {
5264 SVOP* tmpop;
11343788 5265 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
4633a7c4
LW		 5266 null(cvop); /* disable rv2cv */
5267 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
5268 if (tmpop->op_type == OP_GV) {
8ebc5c01 5269 cv = GvCVu(tmpop->op_sv);
5dc0d613 5270 if (cv && SvPOK(cv) && !(o->op_private & OPpENTERSUB_AMPER)) {
46fc3d4c 5271 namegv = CvANON(cv) ? (GV*)tmpop->op_sv : CvGV(cv);
2d8e6c8d 5272 proto = SvPV((SV*)cv, n_a);
46fc3d4c 5273 }
4633a7c4
LW		 5274 }
5275 }
3280af22
NIS		 5276 o->op_private |= (PL_hints & HINT_STRICT_REFS);
5277 if (PERLDB_SUB && PL_curstash != PL_debstash)
11343788
MB		 5278 o->op_private |= OPpENTERSUB_DB;
5279 while (o2 != cvop) {
4633a7c4
LW		 5280 if (proto) {
5281 switch (*proto) {
5282 case '\0':
5dc0d613 5283 return too_many_arguments(o, gv_ename(namegv));
4633a7c4
LW		 5284 case ';':
5285 optional = 1;
5286 proto++;
5287 continue;
5288 case '$':
5289 proto++;
5290 arg++;
11343788 5291 scalar(o2);
4633a7c4
LW		 5292 break;
5293 case '%':
5294 case '@':
11343788 5295 list(o2);
4633a7c4
LW		 5296 arg++;
5297 break;
5298 case '&':
5299 proto++;
5300 arg++;
11343788 5301 if (o2->op_type != OP_REFGEN && o2->op_type != OP_UNDEF)
5dc0d613 5302 bad_type(arg, "block", gv_ename(namegv), o2);
4633a7c4
LW		 5303 break;
5304 case '*':
5305 proto++;
5306 arg++;
11343788 5307 if (o2->op_type == OP_RV2GV)
4633a7c4
LW		 5308 goto wrapref;
5309 {
11343788 5310 OP* kid = o2;
69dcf70c 5311 OP* sib = kid->op_sibling;
4633a7c4 5312 kid->op_sibling = 0;
69dcf70c
MB		 5313 o2 = newUNOP(OP_RV2GV, 0, kid);
5314 o2->op_sibling = sib;
6fa846a0 5315 prev->op_sibling = o2;
4633a7c4
LW		 5316 }
5317 goto wrapref;
5318 case '\\':
5319 proto++;
5320 arg++;
5321 switch (*proto++) {
5322 case '*':
11343788 5323 if (o2->op_type != OP_RV2GV)
5dc0d613 5324 bad_type(arg, "symbol", gv_ename(namegv), o2);
4633a7c4
LW		 5325 goto wrapref;
5326 case '&':
11343788 5327 if (o2->op_type != OP_RV2CV)
5dc0d613 5328 bad_type(arg, "sub", gv_ename(namegv), o2);
4633a7c4
LW		 5329 goto wrapref;
5330 case '$':
386acf99
GS		 5331 if (o2->op_type != OP_RV2SV
5332 && o2->op_type != OP_PADSV
5333 && o2->op_type != OP_THREADSV)
5334 {
5dc0d613 5335 bad_type(arg, "scalar", gv_ename(namegv), o2);
386acf99 5336 }
4633a7c4
LW		 5337 goto wrapref;
5338 case '@':
11343788 5339 if (o2->op_type != OP_RV2AV && o2->op_type != OP_PADAV)
5dc0d613 5340 bad_type(arg, "array", gv_ename(namegv), o2);
4633a7c4
LW		 5341 goto wrapref;
5342 case '%':
11343788 5343 if (o2->op_type != OP_RV2HV && o2->op_type != OP_PADHV)
5dc0d613 5344 bad_type(arg, "hash", gv_ename(namegv), o2);
4633a7c4
LW		 5345 wrapref:
5346 {
11343788 5347 OP* kid = o2;
6fa846a0 5348 OP* sib = kid->op_sibling;
4633a7c4 5349 kid->op_sibling = 0;
6fa846a0
GS		 5350 o2 = newUNOP(OP_REFGEN, 0, kid);
5351 o2->op_sibling = sib;
e858de61 5352 prev->op_sibling = o2;
4633a7c4
LW		 5353 }
5354 break;
5355 default: goto oops;
5356 }
5357 break;
b1cb66bf 5358 case ' ':
5359 proto++;
5360 continue;
4633a7c4
LW		 5361 default:
5362 oops:
5363 croak("Malformed prototype for %s: %s",
2d8e6c8d 5364 gv_ename(namegv), SvPV((SV*)cv, n_a));
4633a7c4
LW		 5365 }
5366 }
5367 else
11343788
MB		 5368 list(o2);
5369 mod(o2, OP_ENTERSUB);
5370 prev = o2;
5371 o2 = o2->op_sibling;
4633a7c4 5372 }
fb73857a 5373 if (proto && !optional &&
5374 (*proto && *proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 5375 return too_few_arguments(o, gv_ename(namegv));
11343788 5376 return o;
79072805
LW		 5377}
5378
5379OP *
8ac85365 5380ck_svconst(OP *o)
8990e307 5381{
11343788
MB		 5382 SvREADONLY_on(cSVOPo->op_sv);
5383 return o;
8990e307
LW		 5384}
5385
5386OP *
8ac85365 5387ck_trunc(OP *o)
79072805 5388{
11343788
MB		 5389 if (o->op_flags & OPf_KIDS) {
5390 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 5391
a0d0e21e
LW		 5392 if (kid->op_type == OP_NULL)
5393 kid = (SVOP*)kid->op_sibling;
5394 if (kid &&
5395 kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE))
11343788 5396 o->op_flags |= OPf_SPECIAL;
79072805 5397 }
11343788 5398 return ck_fun(o);
79072805
LW		 5399}
5400
463ee0b2
LW		 5401/* A peephole optimizer. We visit the ops in the order they're to execute. */
5402
79072805 5403void
8ac85365 5404peep(register OP *o)
79072805 5405{
11343788 5406 dTHR;
79072805 5407 register OP* oldop = 0;
2d8e6c8d
GS		 5408 STRLEN n_a;
5409
a0d0e21e 5410 if (!o || o->op_seq)
79072805 5411 return;
a0d0e21e 5412 ENTER;
462e5cf6 5413 SAVEOP();
3280af22 5414 SAVESPTR(PL_curcop);
a0d0e21e
LW		 5415 for (; o; o = o->op_next) {
5416 if (o->op_seq)
5417 break;
3280af22
NIS		 5418 if (!PL_op_seqmax)
5419 PL_op_seqmax++;
533c011a 5420 PL_op = o;
a0d0e21e
LW		 5421 switch (o->op_type) {
5422 case OP_NEXTSTATE:
5423 case OP_DBSTATE:
3280af22
NIS		 5424 PL_curcop = ((COP*)o); /* for warnings */
5425 o->op_seq = PL_op_seqmax++;
a0d0e21e
LW		 5426 break;
5427
5428 case OP_CONCAT:
5429 case OP_CONST:
5430 case OP_JOIN:
5431 case OP_UC:
5432 case OP_UCFIRST:
5433 case OP_LC:
5434 case OP_LCFIRST:
5435 case OP_QUOTEMETA:
3c4f770c 5436 if (o->op_next && o->op_next->op_type == OP_STRINGIFY)
a0d0e21e 5437 null(o->op_next);
3280af22 5438 o->op_seq = PL_op_seqmax++;
a0d0e21e 5439 break;
8990e307 5440 case OP_STUB:
54310121 5441 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
3280af22 5442 o->op_seq = PL_op_seqmax++;
54310121 5443 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 5444 }
748a9306 5445 goto nothin;
79072805 5446 case OP_NULL:
748a9306 5447 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
3280af22 5448 PL_curcop = ((COP*)o);
748a9306 5449 goto nothin;
79072805 5450 case OP_SCALAR:
93a17b20 5451 case OP_LINESEQ:
463ee0b2 5452 case OP_SCOPE:
748a9306 5453 nothin:
a0d0e21e
LW		 5454 if (oldop && o->op_next) {
5455 oldop->op_next = o->op_next;
79072805
LW		 5456 continue;
5457 }
3280af22 5458 o->op_seq = PL_op_seqmax++;
79072805
LW		 5459 break;
5460
5461 case OP_GV:
a0d0e21e 5462 if (o->op_next->op_type == OP_RV2SV) {
5f05dabc 5463 if (!(o->op_next->op_private & OPpDEREF)) {
a0d0e21e
LW		 5464 null(o->op_next);
5465 o->op_private |= o->op_next->op_private & OPpLVAL_INTRO;
5466 o->op_next = o->op_next->op_next;
5467 o->op_type = OP_GVSV;
22c35a8c 5468 o->op_ppaddr = PL_ppaddr[OP_GVSV];
8990e307
LW		 5469 }
5470 }
a0d0e21e
LW		 5471 else if (o->op_next->op_type == OP_RV2AV) {
5472 OP* pop = o->op_next->op_next;
5473 IV i;
8990e307 5474 if (pop->op_type == OP_CONST &&
533c011a 5475 (PL_op = pop->op_next) &&
8990e307 5476 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 5477 !(pop->op_next->op_private &
68dc0745 5478 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF)) &&
3280af22 5479 (i = SvIV(((SVOP*)pop)->op_sv) - PL_compiling.cop_arybase)
a0d0e21e 5480 <= 255 &&
8990e307
LW		 5481 i >= 0)
5482 {
748a9306 5483 SvREFCNT_dec(((SVOP*)pop)->op_sv);
a0d0e21e 5484 null(o->op_next);
8990e307
LW		 5485 null(pop->op_next);
5486 null(pop);
a0d0e21e
LW		 5487 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
5488 o->op_next = pop->op_next->op_next;
5489 o->op_type = OP_AELEMFAST;
22c35a8c 5490 o->op_ppaddr = PL_ppaddr[OP_AELEMFAST];
a0d0e21e 5491 o->op_private = (U8)i;
a6006777 5492 GvAVn(((GVOP*)o)->op_gv);
8990e307 5493 }
79072805 5494 }
3280af22 5495 o->op_seq = PL_op_seqmax++;
79072805
LW		 5496 break;
5497
a0d0e21e 5498 case OP_MAPWHILE:
79072805
LW		 5499 case OP_GREPWHILE:
5500 case OP_AND:
5501 case OP_OR:
3280af22 5502 o->op_seq = PL_op_seqmax++;
fd4d1407
IZ		 5503 while (cLOGOP->op_other->op_type == OP_NULL)
5504 cLOGOP->op_other = cLOGOP->op_other->op_next;
79072805
LW		 5505 peep(cLOGOP->op_other);
5506 break;
5507
5508 case OP_COND_EXPR:
3280af22 5509 o->op_seq = PL_op_seqmax++;
79072805
LW		 5510 peep(cCONDOP->op_true);
5511 peep(cCONDOP->op_false);
5512 break;
5513
5514 case OP_ENTERLOOP:
3280af22 5515 o->op_seq = PL_op_seqmax++;
79072805
LW		 5516 peep(cLOOP->op_redoop);
5517 peep(cLOOP->op_nextop);
5518 peep(cLOOP->op_lastop);
5519 break;
5520
8782bef2 5521 case OP_QR:
79072805
LW		 5522 case OP_MATCH:
5523 case OP_SUBST:
3280af22 5524 o->op_seq = PL_op_seqmax++;
a0d0e21e 5525 peep(cPMOP->op_pmreplstart);
79072805
LW		 5526 break;
5527
a0d0e21e 5528 case OP_EXEC:
3280af22 5529 o->op_seq = PL_op_seqmax++;
599cee73
PM		 5530 if (ckWARN(WARN_SYNTAX) && o->op_next
5531 && o->op_next->op_type == OP_NEXTSTATE) {
a0d0e21e 5532 if (o->op_next->op_sibling &&
20408e3c
GS		 5533 o->op_next->op_sibling->op_type != OP_EXIT &&
5534 o->op_next->op_sibling->op_type != OP_WARN &&
a0d0e21e 5535 o->op_next->op_sibling->op_type != OP_DIE) {
3280af22 5536 line_t oldline = PL_curcop->cop_line;
a0d0e21e 5537
3280af22 5538 PL_curcop->cop_line = ((COP*)o->op_next)->cop_line;
599cee73
PM		 5539 warner(WARN_SYNTAX, "Statement unlikely to be reached");
5540 warner(WARN_SYNTAX, "(Maybe you meant system() when you said exec()?)\n");
3280af22 5541 PL_curcop->cop_line = oldline;
a0d0e21e
LW		 5542 }
5543 }
5544 break;
aeea060c 5545
c750a3ec
MB		 5546 case OP_HELEM: {
5547 UNOP *rop;
5548 SV *lexname;
5549 GV **fields;
5550 SV **svp, **indsvp;
5551 I32 ind;
5552 char *key;
5553 STRLEN keylen;
aeea060c 5554
c750a3ec
MB		 5555 if (o->op_private & (OPpDEREF_HV|OPpDEREF_AV|OPpLVAL_INTRO)
5556 || ((BINOP*)o)->op_last->op_type != OP_CONST)
5557 break;
5558 rop = (UNOP*)((BINOP*)o)->op_first;
5559 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
5560 break;
3280af22 5561 lexname = *av_fetch(PL_comppad_name, rop->op_first->op_targ, TRUE);
c750a3ec
MB		 5562 if (!SvOBJECT(lexname))
5563 break;
5196be3e 5564 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
c750a3ec
MB		 5565 if (!fields || !GvHV(*fields))
5566 break;
5567 svp = &((SVOP*)((BINOP*)o)->op_last)->op_sv;
5568 key = SvPV(*svp, keylen);
5569 indsvp = hv_fetch(GvHV(*fields), key, keylen, FALSE);
5570 if (!indsvp) {
5571 croak("No such field \"%s\" in variable %s of type %s",
2d8e6c8d 5572 key, SvPV(lexname, n_a), HvNAME(SvSTASH(lexname)));
c750a3ec
MB		 5573 }
5574 ind = SvIV(*indsvp);
5575 if (ind < 1)
5576 croak("Bad index while coercing array into hash");
5577 rop->op_type = OP_RV2AV;
22c35a8c 5578 rop->op_ppaddr = PL_ppaddr[OP_RV2AV];
c750a3ec 5579 o->op_type = OP_AELEM;
22c35a8c 5580 o->op_ppaddr = PL_ppaddr[OP_AELEM];
c750a3ec
MB		 5581 SvREFCNT_dec(*svp);
5582 *svp = newSViv(ind);
5583 break;
5584 }
5585
79072805 5586 default:
3280af22 5587 o->op_seq = PL_op_seqmax++;
79072805
LW		 5588 break;
5589 }
a0d0e21e 5590 oldop = o;
79072805 5591 }
a0d0e21e 5592 LEAVE;
79072805 5593}
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