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a0d0e21e 1/* op.c
79072805 2 *
9607fc9c 3 * Copyright (c) 1991-1997, Larry Wall
79072805
LW		 4 *
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
7 *
a0d0e21e
LW		 8 */
9
10/*
11 * "You see: Mr. Drogo, he married poor Miss Primula Brandybuck. She was
12 * our Mr. Bilbo's first cousin on the mother's side (her mother being the
13 * youngest of the Old Took's daughters); and Mr. Drogo was his second
14 * cousin. So Mr. Frodo is his first *and* second cousin, once removed
15 * either way, as the saying is, if you follow me." --the Gaffer
79072805
LW		 16 */
17
18#include "EXTERN.h"
19#include "perl.h"
20
76e3520e
GS		 21#ifdef PERL_OBJECT
22#define CHECKCALL this->*check
23#else
24#define CHECKCALL *check
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), \
28757baa 34 croak("%s trapped by operation mask", op_desc[type]), \
35 Nullop ) \
76e3520e 36 : (CHECKCALL[type])((OP*)o))
e50aee73 37
0eba9742
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,
a575ca2f 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));
76e3520e 54#endif
79072805 55
76e3520e 56STATIC char*
8ac85365 57gv_ename(GV *gv)
4633a7c4
LW		 58{
59 SV* tmpsv = sv_newmortal();
46fc3d4c 60 gv_efullname3(tmpsv, gv, Nullch);
3280af22 61 return SvPV(tmpsv,PL_na);
4633a7c4
LW		 62}
63
76e3520e 64STATIC OP *
8ac85365 65no_fh_allowed(OP *o)
79072805 66{
46fc3d4c 67 yyerror(form("Missing comma after first argument to %s function",
5196be3e 68 op_desc[o->op_type]));
11343788 69 return o;
79072805
LW		 70}
71
76e3520e 72STATIC OP *
8ac85365 73too_few_arguments(OP *o, char *name)
79072805 74{
46fc3d4c 75 yyerror(form("Not enough arguments for %s", name));
11343788 76 return o;
79072805
LW		 77}
78
76e3520e 79STATIC OP *
8ac85365 80too_many_arguments(OP *o, char *name)
79072805 81{
46fc3d4c 82 yyerror(form("Too many arguments for %s", name));
11343788 83 return o;
79072805
LW		 84}
85
76e3520e 86STATIC void
8ac85365 87bad_type(I32 n, char *t, char *name, OP *kid)
8990e307 88{
46fc3d4c 89 yyerror(form("Type of arg %d to %s must be %s (not %s)",
90 (int)n, name, t, op_desc[kid->op_type]));
8990e307
LW		 91}
92
a0d0e21e 93void
8ac85365 94assertref(OP *o)
a0d0e21e 95{
11343788 96 int type = o->op_type;
136254bc 97 if (type != OP_AELEM && type != OP_HELEM && type != OP_GELEM) {
46fc3d4c 98 yyerror(form("Can't use subscript on %s", op_desc[type]));
bde90e66 99 if (type == OP_ENTERSUB || type == OP_RV2HV || type == OP_PADHV) {
9c82454c 100 dTHR;
bde90e66
HS		 101 SV *msg = sv_2mortal(
102 newSVpvf("(Did you mean $ or @ instead of %c?)\n",
103 type == OP_ENTERSUB ? '&' : '%'));
3280af22 104 if (PL_in_eval & 2)
bde90e66 105 warn("%_", msg);
3280af22
NIS		 106 else if (PL_in_eval)
107 sv_catsv(GvSV(PL_errgv), msg);
bde90e66
HS		 108 else
109 PerlIO_write(PerlIO_stderr(), SvPVX(msg), SvCUR(msg));
110 }
a0d0e21e
LW		 111 }
112}
113
79072805
LW		 114/* "register" allocation */
115
116PADOFFSET
8ac85365 117pad_allocmy(char *name)
93a17b20 118{
11343788 119 dTHR;
a0d0e21e
LW		 120 PADOFFSET off;
121 SV *sv;
122
123 if (!(isALPHA(name[1]) || name[1] == '_' && (int)strlen(name) > 2)) {
46fc3d4c 124 if (!isPRINT(name[1])) {
125 name[3] = '\0';
126 name[2] = toCTRL(name[1]);
127 name[1] = '^';
128 }
a0d0e21e
LW		 129 croak("Can't use global %s in \"my\"",name);
130 }
3280af22
NIS		 131 if (PL_dowarn && AvFILLp(PL_comppad_name) >= 0) {
132 SV **svp = AvARRAY(PL_comppad_name);
133 for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_floor; off--) {
b1cb66bf 134 if ((sv = svp[off])
3280af22 135 && sv != &PL_sv_undef
340937ab 136 && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
b1cb66bf 137 && strEQ(name, SvPVX(sv)))
138 {
340937ab
JD		 139 warn("\"my\" variable %s masks earlier declaration in same %s",
140 name, (SvIVX(sv) == PAD_MAX ? "scope" : "statement"));
b1cb66bf 141 break;
142 }
143 }
144 }
a0d0e21e
LW		 145 off = pad_alloc(OP_PADSV, SVs_PADMY);
146 sv = NEWSV(1102,0);
93a17b20
LW		 147 sv_upgrade(sv, SVt_PVNV);
148 sv_setpv(sv, name);
3280af22 149 if (PL_in_my_stash) {
c750a3ec
MB		 150 if (*name != '$')
151 croak("Can't declare class for non-scalar %s in \"my\"",name);
152 SvOBJECT_on(sv);
153 (void)SvUPGRADE(sv, SVt_PVMG);
3280af22
NIS		 154 SvSTASH(sv) = (HV*)SvREFCNT_inc(PL_in_my_stash);
155 PL_sv_objcount++;
c750a3ec 156 }
3280af22 157 av_store(PL_comppad_name, off, sv);
0eba9742 158 SvNVX(sv) = (double)PAD_MAX;
8990e307 159 SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
3280af22
NIS		 160 if (!PL_min_intro_pending)
161 PL_min_intro_pending = off;
162 PL_max_intro_pending = off;
93a17b20 163 if (*name == '@')
3280af22 164 av_store(PL_comppad, off, (SV*)newAV());
93a17b20 165 else if (*name == '%')
3280af22
NIS		 166 av_store(PL_comppad, off, (SV*)newHV());
167 SvPADMY_on(PL_curpad[off]);
93a17b20
LW		 168 return off;
169}
170
76e3520e 171STATIC PADOFFSET
a575ca2f 172pad_findlex(char *name, PADOFFSET newoff, U32 seq, CV* startcv, I32 cx_ix, I32 saweval)
93a17b20 173{
11343788 174 dTHR;
748a9306 175 CV *cv;
93a17b20
LW		 176 I32 off;
177 SV *sv;
93a17b20 178 register I32 i;
c09156bb 179 register PERL_CONTEXT *cx;
93a17b20 180
748a9306 181 for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
4fdae800 182 AV *curlist = CvPADLIST(cv);
183 SV **svp = av_fetch(curlist, 0, FALSE);
748a9306 184 AV *curname;
4fdae800 185
3280af22 186 if (!svp || *svp == &PL_sv_undef)
4633a7c4 187 continue;
748a9306
LW		 188 curname = (AV*)*svp;
189 svp = AvARRAY(curname);
93965878 190 for (off = AvFILLp(curname); off > 0; off--) {
748a9306 191 if ((sv = svp[off]) &&
3280af22 192 sv != &PL_sv_undef &&
748a9306 193 seq <= SvIVX(sv) &&
13826f2c 194 seq > I_32(SvNVX(sv)) &&
748a9306
LW		 195 strEQ(SvPVX(sv), name))
196 {
5f05dabc 197 I32 depth;
198 AV *oldpad;
199 SV *oldsv;
200
201 depth = CvDEPTH(cv);
202 if (!depth) {
9607fc9c 203 if (newoff) {
204 if (SvFAKE(sv))
205 continue;
4fdae800 206 return 0; /* don't clone from inactive stack frame */
9607fc9c 207 }
5f05dabc 208 depth = 1;
209 }
210 oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
211 oldsv = *av_fetch(oldpad, off, TRUE);
748a9306 212 if (!newoff) { /* Not a mere clone operation. */
9607fc9c 213 SV *namesv = NEWSV(1103,0);
748a9306 214 newoff = pad_alloc(OP_PADSV, SVs_PADMY);
9607fc9c 215 sv_upgrade(namesv, SVt_PVNV);
216 sv_setpv(namesv, name);
3280af22
NIS		 217 av_store(PL_comppad_name, newoff, namesv);
218 SvNVX(namesv) = (double)PL_curcop->cop_seq;
0eba9742 219 SvIVX(namesv) = PAD_MAX; /* A ref, intro immediately */
9607fc9c 220 SvFAKE_on(namesv); /* A ref, not a real var */
a575ca2f
GB		 221 if (SvOBJECT(svp[off])) { /* A typed var */
222 SvOBJECT_on(namesv);
223 (void)SvUPGRADE(namesv, SVt_PVMG);
224 SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*)SvSTASH(svp[off]));
225 PL_sv_objcount++;
226 }
3280af22 227 if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) {
28757baa 228 /* "It's closures all the way down." */
3280af22 229 CvCLONE_on(PL_compcv);
54310121 230 if (cv == startcv) {
3280af22 231 if (CvANON(PL_compcv))
54310121 232 oldsv = Nullsv; /* no need to keep ref */
233 }
234 else {
28757baa 235 CV *bcv;
236 for (bcv = startcv;
237 bcv && bcv != cv && !CvCLONE(bcv);
4e43f39e
GB		 238 bcv = CvOUTSIDE(bcv))
239 {
28757baa 240 if (CvANON(bcv))
241 CvCLONE_on(bcv);
242 else {
4e43f39e
GB		 243 if (PL_dowarn
244 && !CvUNIQUE(bcv) && !CvUNIQUE(cv))
245 {
44a8e56a 246 warn(
247 "Variable \"%s\" may be unavailable",
28757baa 248 name);
4e43f39e 249 }
28757baa 250 break;
251 }
252 }
253 }
254 }
3280af22
NIS		 255 else if (!CvUNIQUE(PL_compcv)) {
256 if (PL_dowarn && !SvFAKE(sv) && !CvUNIQUE(cv))
44a8e56a 257 warn("Variable \"%s\" will not stay shared", name);
5f05dabc 258 }
748a9306 259 }
3280af22 260 av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv));
748a9306
LW		 261 return newoff;
262 }
93a17b20
LW		 263 }
264 }
265
266 /* Nothing in current lexical context--try eval's context, if any.
267 * This is necessary to let the perldb get at lexically scoped variables.
268 * XXX This will also probably interact badly with eval tree caching.
269 */
270
748a9306 271 for (i = cx_ix; i >= 0; i--) {
93a17b20 272 cx = &cxstack[i];
4e43f39e 273 switch (CxTYPE(cx)) {
93a17b20 274 default:
748a9306
LW		 275 if (i == 0 && saweval) {
276 seq = cxstack[saweval].blk_oldcop->cop_seq;
a575ca2f 277 return pad_findlex(name, newoff, seq, PL_main_cv, -1, saweval);
748a9306 278 }
93a17b20
LW		 279 break;
280 case CXt_EVAL:
44a8e56a 281 switch (cx->blk_eval.old_op_type) {
282 case OP_ENTEREVAL:
4e43f39e
GB		 283 if (CxREALEVAL(cx))
284 saweval = i;
44a8e56a 285 break;
286 case OP_REQUIRE:
287 /* require must have its own scope */
288 return 0;
289 }
93a17b20
LW		 290 break;
291 case CXt_SUB:
292 if (!saweval)
293 return 0;
294 cv = cx->blk_sub.cv;
3280af22 295 if (PL_debstash && CvSTASH(cv) == PL_debstash) { /* ignore DB'* scope */
748a9306 296 saweval = i; /* so we know where we were called from */
93a17b20 297 continue;
93a17b20 298 }
748a9306 299 seq = cxstack[saweval].blk_oldcop->cop_seq;
a575ca2f 300 return pad_findlex(name, newoff, seq, cv, i-1, saweval);
93a17b20
LW		 301 }
302 }
303
748a9306
LW		 304 return 0;
305}
a0d0e21e 306
748a9306 307PADOFFSET
8ac85365 308pad_findmy(char *name)
748a9306 309{
11343788 310 dTHR;
748a9306 311 I32 off;
54310121 312 I32 pendoff = 0;
748a9306 313 SV *sv;
3280af22
NIS		 314 SV **svp = AvARRAY(PL_comppad_name);
315 U32 seq = PL_cop_seqmax;
4e43f39e
GB		 316 PERL_CONTEXT *cx;
317 CV *outside;
748a9306 318
11343788
MB		 319#ifdef USE_THREADS
320 /*
321 * Special case to get lexical (and hence per-thread) @_.
322 * XXX I need to find out how to tell at parse-time whether use
323 * of @_ should refer to a lexical (from a sub) or defgv (global
324 * scope and maybe weird sub-ish things like formats). See
325 * startsub in perly.y. It's possible that @_ could be lexical
326 * (at least from subs) even in non-threaded perl.
327 */
328 if (strEQ(name, "@_"))
329 return 0; /* success. (NOT_IN_PAD indicates failure) */
330#endif /* USE_THREADS */
331
748a9306 332 /* The one we're looking for is probably just before comppad_name_fill. */
3280af22 333 for (off = AvFILLp(PL_comppad_name); off > 0; off--) {
a0d0e21e 334 if ((sv = svp[off]) &&
3280af22 335 sv != &PL_sv_undef &&
54310121 336 (!SvIVX(sv) ||
337 (seq <= SvIVX(sv) &&
338 seq > I_32(SvNVX(sv)))) &&
a0d0e21e
LW		 339 strEQ(SvPVX(sv), name))
340 {
54310121 341 if (SvIVX(sv))
342 return (PADOFFSET)off;
343 pendoff = off; /* this pending def. will override import */
a0d0e21e
LW		 344 }
345 }
748a9306 346
4e43f39e
GB		 347 outside = CvOUTSIDE(PL_compcv);
348
349 /* Check if if we're compiling an eval'', and adjust seq to be the
350 * eval's seq number. This depends on eval'' having a non-null
351 * CvOUTSIDE() while it is being compiled. The eval'' itself is
352 * identified by CvUNIQUE being set and CvGV being null. */
353 if (outside && CvUNIQUE(PL_compcv) && !CvGV(PL_compcv) && cxstack_ix >= 0) {
354 cx = &cxstack[cxstack_ix];
355 if (CxREALEVAL(cx))
356 seq = cx->blk_oldcop->cop_seq;
357 }
358
748a9306 359 /* See if it's in a nested scope */
4e43f39e 360 off = pad_findlex(name, 0, seq, outside, cxstack_ix, 0);
54310121 361 if (off) {
362 /* If there is a pending local definition, this new alias must die */
363 if (pendoff)
3280af22 364 SvIVX(AvARRAY(PL_comppad_name)[off]) = seq;
11343788 365 return off; /* pad_findlex returns 0 for failure...*/
54310121 366 }
11343788 367 return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */
93a17b20
LW		 368}
369
370void
8ac85365 371pad_leavemy(I32 fill)
93a17b20
LW		 372{
373 I32 off;
3280af22 374 SV **svp = AvARRAY(PL_comppad_name);
93a17b20 375 SV *sv;
3280af22
NIS		 376 if (PL_min_intro_pending && fill < PL_min_intro_pending) {
377 for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
378 if ((sv = svp[off]) && sv != &PL_sv_undef)
8990e307
LW		 379 warn("%s never introduced", SvPVX(sv));
380 }
381 }
382 /* "Deintroduce" my variables that are leaving with this scope. */
3280af22 383 for (off = AvFILLp(PL_comppad_name); off > fill; off--) {
0eba9742 384 if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == PAD_MAX)
3280af22 385 SvIVX(sv) = PL_cop_seqmax;
93a17b20
LW		 386 }
387}
388
389PADOFFSET
8ac85365 390pad_alloc(I32 optype, U32 tmptype)
79072805 391{
11343788 392 dTHR;
79072805
LW		 393 SV *sv;
394 I32 retval;
395
3280af22 396 if (AvARRAY(PL_comppad) != PL_curpad)
463ee0b2 397 croak("panic: pad_alloc");
3280af22 398 if (PL_pad_reset_pending)
a0d0e21e 399 pad_reset();
ed6116ce 400 if (tmptype & SVs_PADMY) {
79072805 401 do {
3280af22 402 sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
ed6116ce 403 } while (SvPADBUSY(sv)); /* need a fresh one */
3280af22 404 retval = AvFILLp(PL_comppad);
79072805
LW		 405 }
406 else {
3280af22
NIS		 407 SV **names = AvARRAY(PL_comppad_name);
408 SSize_t names_fill = AvFILLp(PL_comppad_name);
bbce6d69 409 for (;;) {
410 /*
411 * "foreach" index vars temporarily become aliases to non-"my"
412 * values. Thus we must skip, not just pad values that are
413 * marked as current pad values, but also those with names.
414 */
3280af22
NIS		 415 if (++PL_padix <= names_fill &&
416 (sv = names[PL_padix]) && sv != &PL_sv_undef)
bbce6d69 417 continue;
3280af22 418 sv = *av_fetch(PL_comppad, PL_padix, TRUE);
bbce6d69 419 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
420 break;
421 }
3280af22 422 retval = PL_padix;
79072805 423 }
8990e307 424 SvFLAGS(sv) |= tmptype;
3280af22 425 PL_curpad = AvARRAY(PL_comppad);
11343788 426#ifdef USE_THREADS
5dc0d613 427 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
533c011a 428 (unsigned long) thr, (unsigned long) PL_curpad,
5dc0d613 429 (long) retval, op_name[optype]));
11343788 430#else
d9bb4600 431 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx alloc %ld for %s\n",
3280af22 432 (unsigned long) PL_curpad,
5dc0d613 433 (long) retval, op_name[optype]));
11343788 434#endif /* USE_THREADS */
79072805
LW		 435 return (PADOFFSET)retval;
436}
437
438SV *
8990e307 439pad_sv(PADOFFSET po)
79072805 440{
11343788
MB		 441 dTHR;
442#ifdef USE_THREADS
5dc0d613 443 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
533c011a 444 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 445#else
79072805 446 if (!po)
463ee0b2 447 croak("panic: pad_sv po");
d9bb4600 448 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx sv %d\n",
3280af22 449 (unsigned long) PL_curpad, po));
11343788 450#endif /* USE_THREADS */
3280af22 451 return PL_curpad[po]; /* eventually we'll turn this into a macro */
79072805
LW		 452}
453
454void
8990e307 455pad_free(PADOFFSET po)
79072805 456{
11343788 457 dTHR;
3280af22 458 if (!PL_curpad)
a0d0e21e 459 return;
3280af22 460 if (AvARRAY(PL_comppad) != PL_curpad)
463ee0b2 461 croak("panic: pad_free curpad");
79072805 462 if (!po)
463ee0b2 463 croak("panic: pad_free po");
11343788 464#ifdef USE_THREADS
5dc0d613 465 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
533c011a 466 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 467#else
d9bb4600 468 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx free %d\n",
3280af22 469 (unsigned long) PL_curpad, po));
11343788 470#endif /* USE_THREADS */
3280af22
NIS		 471 if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef)
472 SvPADTMP_off(PL_curpad[po]);
473 if ((I32)po < PL_padix)
474 PL_padix = po - 1;
79072805
LW		 475}
476
477void
8990e307 478pad_swipe(PADOFFSET po)
79072805 479{
11343788 480 dTHR;
3280af22 481 if (AvARRAY(PL_comppad) != PL_curpad)
463ee0b2 482 croak("panic: pad_swipe curpad");
79072805 483 if (!po)
463ee0b2 484 croak("panic: pad_swipe po");
11343788 485#ifdef USE_THREADS
5dc0d613 486 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
533c011a 487 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 488#else
d9bb4600 489 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx swipe %d\n",
3280af22 490 (unsigned long) PL_curpad, po));
11343788 491#endif /* USE_THREADS */
3280af22
NIS		 492 SvPADTMP_off(PL_curpad[po]);
493 PL_curpad[po] = NEWSV(1107,0);
494 SvPADTMP_on(PL_curpad[po]);
495 if ((I32)po < PL_padix)
496 PL_padix = po - 1;
79072805
LW		 497}
498
d9bb4600
GS		 499/* XXX pad_reset() is currently disabled because it results in serious bugs.
500 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
501 * on the stack by OPs that use them, there are several ways to get an alias
502 * to a shared TARG. Such an alias will change randomly and unpredictably.
503 * We avoid doing this until we can think of a Better Way.
504 * GSAR 97-10-29 */
79072805 505void
8ac85365 506pad_reset(void)
79072805 507{
d9bb4600 508#ifdef USE_BROKEN_PAD_RESET
11343788 509 dTHR;
79072805
LW		 510 register I32 po;
511
6b88bc9c 512 if (AvARRAY(PL_comppad) != PL_curpad)
463ee0b2 513 croak("panic: pad_reset curpad");
11343788 514#ifdef USE_THREADS
5dc0d613 515 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
6b88bc9c 516 (unsigned long) thr, (unsigned long) PL_curpad));
11343788 517#else
d9bb4600 518 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx reset\n",
6b88bc9c 519 (unsigned long) PL_curpad));
11343788 520#endif /* USE_THREADS */
6b88bc9c
GS		 521 if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */
522 for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
523 if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
524 SvPADTMP_off(PL_curpad[po]);
748a9306 525 }
6b88bc9c 526 PL_padix = PL_padix_floor;
79072805 527 }
d9bb4600 528#endif
3280af22 529 PL_pad_reset_pending = FALSE;
79072805
LW		 530}
531
a863c7d1 532#ifdef USE_THREADS
54b9620d 533/* find_threadsv is not reentrant */
a863c7d1 534PADOFFSET
54b9620d 535find_threadsv(char *name)
a863c7d1
MB		 536{
537 dTHR;
538 char *p;
539 PADOFFSET key;
554b3eca 540 SV **svp;
54b9620d 541 /* We currently only handle names of a single character */
533c011a 542 p = strchr(PL_threadsv_names, *name);
a863c7d1
MB		 543 if (!p)
544 return NOT_IN_PAD;
533c011a 545 key = p - PL_threadsv_names;
54b9620d 546 svp = av_fetch(thr->threadsv, key, FALSE);
554b3eca
MB		 547 if (!svp) {
548 SV *sv = NEWSV(0, 0);
54b9620d 549 av_store(thr->threadsv, key, sv);
940cb80d 550 thr->threadsvp = AvARRAY(thr->threadsv);
554b3eca
MB		 551 /*
552 * Some magic variables used to be automagically initialised
553 * in gv_fetchpv. Those which are now per-thread magicals get
554 * initialised here instead.
555 */
556 switch (*name) {
54b9620d
MB		 557 case '_':
558 break;
554b3eca
MB		 559 case ';':
560 sv_setpv(sv, "\034");
54b9620d 561 sv_magic(sv, 0, 0, name, 1);
554b3eca 562 break;
c277df42
IZ		 563 case '&':
564 case '`':
565 case '\'':
533c011a 566 PL_sawampersand = TRUE;
50a10aa9
GB		 567 /* FALL THROUGH */
568 case '1':
569 case '2':
570 case '3':
571 case '4':
572 case '5':
573 case '6':
574 case '7':
575 case '8':
576 case '9':
c277df42 577 SvREADONLY_on(sv);
d8b5173a 578 /* FALL THROUGH */
067391ea
GS		 579
580 /* XXX %! tied to Errno.pm needs to be added here.
581 * See gv_fetchpv(). */
582 /* case '!': */
583
54b9620d
MB		 584 default:
585 sv_magic(sv, 0, 0, name, 1);
554b3eca 586 }
8b73bbec 587 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
54b9620d 588 "find_threadsv: new SV %p for $%s%c\n",
554b3eca
MB		 589 sv, (*name < 32) ? "^" : "",
590 (*name < 32) ? toCTRL(*name) : *name));
a863c7d1
MB		 591 }
592 return key;
593}
594#endif /* USE_THREADS */
595
79072805
LW		 596/* Destructor */
597
598void
8ac85365 599op_free(OP *o)
79072805 600{
85e6fe83 601 register OP *kid, *nextkid;
79072805 602
5dc0d613 603 if (!o || o->op_seq == (U16)-1)
79072805
LW		 604 return;
605
11343788
MB		 606 if (o->op_flags & OPf_KIDS) {
607 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 608 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 609 op_free(kid);
85e6fe83 610 }
79072805
LW		 611 }
612
11343788 613 switch (o->op_type) {
8990e307 614 case OP_NULL:
11343788 615 o->op_targ = 0; /* Was holding old type, if any. */
8990e307 616 break;
a0d0e21e 617 case OP_ENTEREVAL:
11343788 618 o->op_targ = 0; /* Was holding hints. */
a0d0e21e 619 break;
554b3eca 620#ifdef USE_THREADS
8dd3ba40
SM		 621 case OP_ENTERITER:
622 if (!(o->op_flags & OPf_SPECIAL))
623 break;
624 /* FALL THROUGH */
2faa37cc 625 case OP_THREADSV:
54b9620d 626 o->op_targ = 0; /* Was holding index into thr->threadsv AV. */
554b3eca
MB		 627 break;
628#endif /* USE_THREADS */
a6006777 629 default:
ac4c12e7
GS		 630 if (!(o->op_flags & OPf_REF)
631 || (check[o->op_type] != FUNC_NAME_TO_PTR(ck_ftst)))
a6006777 632 break;
633 /* FALL THROUGH */
463ee0b2 634 case OP_GVSV:
79072805 635 case OP_GV:
a6006777 636 case OP_AELEMFAST:
11343788 637 SvREFCNT_dec(cGVOPo->op_gv);
8990e307
LW		 638 break;
639 case OP_NEXTSTATE:
640 case OP_DBSTATE:
5196be3e 641 Safefree(cCOPo->cop_label);
11343788 642 SvREFCNT_dec(cCOPo->cop_filegv);
79072805
LW		 643 break;
644 case OP_CONST:
11343788 645 SvREFCNT_dec(cSVOPo->op_sv);
79072805 646 break;
748a9306
LW		 647 case OP_GOTO:
648 case OP_NEXT:
649 case OP_LAST:
650 case OP_REDO:
11343788 651 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 652 break;
653 /* FALL THROUGH */
a0d0e21e 654 case OP_TRANS:
11343788 655 Safefree(cPVOPo->op_pv);
a0d0e21e
LW		 656 break;
657 case OP_SUBST:
11343788 658 op_free(cPMOPo->op_pmreplroot);
a0d0e21e 659 /* FALL THROUGH */
748a9306 660 case OP_PUSHRE:
a0d0e21e 661 case OP_MATCH:
8782bef2 662 case OP_QR:
c277df42 663 ReREFCNT_dec(cPMOPo->op_pmregexp);
a0d0e21e 664 break;
79072805
LW		 665 }
666
11343788
MB		 667 if (o->op_targ > 0)
668 pad_free(o->op_targ);
8990e307 669
11343788 670 Safefree(o);
79072805
LW		 671}
672
76e3520e 673STATIC void
8ac85365 674null(OP *o)
8990e307 675{
54b9620d 676 if (o->op_type != OP_NULL && o->op_type != OP_THREADSV && o->op_targ > 0)
11343788
MB		 677 pad_free(o->op_targ);
678 o->op_targ = o->op_type;
679 o->op_type = OP_NULL;
680 o->op_ppaddr = ppaddr[OP_NULL];
8990e307
LW		 681}
682
79072805
LW		 683/* Contextualizers */
684
463ee0b2 685#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 686
687OP *
8ac85365 688linklist(OP *o)
79072805
LW		 689{
690 register OP *kid;
691
11343788
MB		 692 if (o->op_next)
693 return o->op_next;
79072805
LW		 694
695 /* establish postfix order */
11343788
MB		 696 if (cUNOPo->op_first) {
697 o->op_next = LINKLIST(cUNOPo->op_first);
698 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 699 if (kid->op_sibling)
700 kid->op_next = LINKLIST(kid->op_sibling);
701 else
11343788 702 kid->op_next = o;
79072805
LW		 703 }
704 }
705 else
11343788 706 o->op_next = o;
79072805 707
11343788 708 return o->op_next;
79072805
LW		 709}
710
711OP *
8ac85365 712scalarkids(OP *o)
79072805
LW		 713{
714 OP *kid;
11343788
MB		 715 if (o && o->op_flags & OPf_KIDS) {
716 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 717 scalar(kid);
718 }
11343788 719 return o;
79072805
LW		 720}
721
76e3520e 722STATIC OP *
8ac85365 723scalarboolean(OP *o)
8990e307 724{
3280af22 725 if (PL_dowarn &&
11343788 726 o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
0f15f207 727 dTHR;
3280af22 728 line_t oldline = PL_curcop->cop_line;
a0d0e21e 729
3280af22
NIS		 730 if (PL_copline != NOLINE)
731 PL_curcop->cop_line = PL_copline;
a0d0e21e 732 warn("Found = in conditional, should be ==");
3280af22 733 PL_curcop->cop_line = oldline;
a0d0e21e 734 }
11343788 735 return scalar(o);
8990e307
LW		 736}
737
738OP *
8ac85365 739scalar(OP *o)
79072805
LW		 740{
741 OP *kid;
742
a0d0e21e 743 /* assumes no premature commitment */
3280af22 744 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 745 || o->op_type == OP_RETURN)
11343788 746 return o;
79072805 747
5dc0d613 748 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 749
11343788 750 switch (o->op_type) {
79072805 751 case OP_REPEAT:
11343788
MB		 752 if (o->op_private & OPpREPEAT_DOLIST)
753 null(((LISTOP*)cBINOPo->op_first)->op_first);
754 scalar(cBINOPo->op_first);
8990e307 755 break;
79072805
LW		 756 case OP_OR:
757 case OP_AND:
758 case OP_COND_EXPR:
11343788 759 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 760 scalar(kid);
79072805 761 break;
a0d0e21e 762 case OP_SPLIT:
11343788 763 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 764 if (!kPMOP->op_pmreplroot)
765 deprecate("implicit split to @_");
766 }
767 /* FALL THROUGH */
79072805 768 case OP_MATCH:
8782bef2 769 case OP_QR:
79072805
LW		 770 case OP_SUBST:
771 case OP_NULL:
8990e307 772 default:
11343788
MB		 773 if (o->op_flags & OPf_KIDS) {
774 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 775 scalar(kid);
776 }
79072805
LW		 777 break;
778 case OP_LEAVE:
779 case OP_LEAVETRY:
5dc0d613 780 kid = cLISTOPo->op_first;
54310121 781 scalar(kid);
782 while (kid = kid->op_sibling) {
783 if (kid->op_sibling)
784 scalarvoid(kid);
785 else
786 scalar(kid);
787 }
3280af22 788 WITH_THR(PL_curcop = &PL_compiling);
54310121 789 break;
748a9306 790 case OP_SCOPE:
79072805 791 case OP_LINESEQ:
8990e307 792 case OP_LIST:
11343788 793 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 794 if (kid->op_sibling)
795 scalarvoid(kid);
796 else
797 scalar(kid);
798 }
3280af22 799 WITH_THR(PL_curcop = &PL_compiling);
79072805
LW		 800 break;
801 }
11343788 802 return o;
79072805
LW		 803}
804
805OP *
8ac85365 806scalarvoid(OP *o)
79072805
LW		 807{
808 OP *kid;
8990e307
LW		 809 char* useless = 0;
810 SV* sv;
79072805 811
54310121 812 /* assumes no premature commitment */
3280af22 813 if (!o || (o->op_flags & OPf_WANT) == OPf_WANT_LIST || PL_error_count
5dc0d613 814 || o->op_type == OP_RETURN)
11343788 815 return o;
79072805 816
5dc0d613 817 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 818
11343788 819 switch (o->op_type) {
79072805 820 default:
11343788 821 if (!(opargs[o->op_type] & OA_FOLDCONST))
8990e307 822 break;
36477c24 823 /* FALL THROUGH */
824 case OP_REPEAT:
11343788 825 if (o->op_flags & OPf_STACKED)
8990e307 826 break;
5d82c453
GA		 827 goto func_ops;
828 case OP_SUBSTR:
829 if (o->op_private == 4)
830 break;
8990e307
LW		 831 /* FALL THROUGH */
832 case OP_GVSV:
833 case OP_WANTARRAY:
834 case OP_GV:
835 case OP_PADSV:
836 case OP_PADAV:
837 case OP_PADHV:
838 case OP_PADANY:
839 case OP_AV2ARYLEN:
8990e307 840 case OP_REF:
a0d0e21e
LW		 841 case OP_REFGEN:
842 case OP_SREFGEN:
8990e307
LW		 843 case OP_DEFINED:
844 case OP_HEX:
845 case OP_OCT:
846 case OP_LENGTH:
8990e307
LW		 847 case OP_VEC:
848 case OP_INDEX:
849 case OP_RINDEX:
850 case OP_SPRINTF:
851 case OP_AELEM:
852 case OP_AELEMFAST:
853 case OP_ASLICE:
8990e307
LW		 854 case OP_HELEM:
855 case OP_HSLICE:
856 case OP_UNPACK:
857 case OP_PACK:
8990e307
LW		 858 case OP_JOIN:
859 case OP_LSLICE:
860 case OP_ANONLIST:
861 case OP_ANONHASH:
862 case OP_SORT:
863 case OP_REVERSE:
864 case OP_RANGE:
865 case OP_FLIP:
866 case OP_FLOP:
867 case OP_CALLER:
868 case OP_FILENO:
869 case OP_EOF:
870 case OP_TELL:
871 case OP_GETSOCKNAME:
872 case OP_GETPEERNAME:
873 case OP_READLINK:
874 case OP_TELLDIR:
875 case OP_GETPPID:
876 case OP_GETPGRP:
877 case OP_GETPRIORITY:
878 case OP_TIME:
879 case OP_TMS:
880 case OP_LOCALTIME:
881 case OP_GMTIME:
882 case OP_GHBYNAME:
883 case OP_GHBYADDR:
884 case OP_GHOSTENT:
885 case OP_GNBYNAME:
886 case OP_GNBYADDR:
887 case OP_GNETENT:
888 case OP_GPBYNAME:
889 case OP_GPBYNUMBER:
890 case OP_GPROTOENT:
891 case OP_GSBYNAME:
892 case OP_GSBYPORT:
893 case OP_GSERVENT:
894 case OP_GPWNAM:
895 case OP_GPWUID:
896 case OP_GGRNAM:
897 case OP_GGRGID:
898 case OP_GETLOGIN:
5d82c453 899 func_ops:
11343788
MB		 900 if (!(o->op_private & OPpLVAL_INTRO))
901 useless = op_desc[o->op_type];
8990e307
LW		 902 break;
903
904 case OP_RV2GV:
905 case OP_RV2SV:
906 case OP_RV2AV:
907 case OP_RV2HV:
11343788
MB		 908 if (!(o->op_private & OPpLVAL_INTRO) &&
909 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 910 useless = "a variable";
911 break;
79072805 912
93a17b20 913 case OP_NEXTSTATE:
8990e307 914 case OP_DBSTATE:
3280af22 915 WITH_THR(PL_curcop = ((COP*)o)); /* for warning below */
93a17b20
LW		 916 break;
917
79072805 918 case OP_CONST:
11343788 919 sv = cSVOPo->op_sv;
3280af22 920 if (PL_dowarn) {
8990e307
LW		 921 useless = "a constant";
922 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
923 useless = 0;
924 else if (SvPOK(sv)) {
925 if (strnEQ(SvPVX(sv), "di", 2) ||
a0d0e21e 926 strnEQ(SvPVX(sv), "ds", 2) ||
8990e307
LW		 927 strnEQ(SvPVX(sv), "ig", 2))
928 useless = 0;
929 }
930 }
11343788 931 null(o); /* don't execute a constant */
8990e307 932 SvREFCNT_dec(sv); /* don't even remember it */
79072805
LW		 933 break;
934
935 case OP_POSTINC:
11343788
MB		 936 o->op_type = OP_PREINC; /* pre-increment is faster */
937 o->op_ppaddr = ppaddr[OP_PREINC];
79072805
LW		 938 break;
939
940 case OP_POSTDEC:
11343788
MB		 941 o->op_type = OP_PREDEC; /* pre-decrement is faster */
942 o->op_ppaddr = ppaddr[OP_PREDEC];
79072805
LW		 943 break;
944
79072805
LW		 945 case OP_OR:
946 case OP_AND:
947 case OP_COND_EXPR:
11343788 948 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 949 scalarvoid(kid);
950 break;
5aabfad6 951
a0d0e21e 952 case OP_NULL:
11343788 953 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
3280af22 954 WITH_THR(PL_curcop = ((COP*)o)); /* for warning below */
11343788 955 if (o->op_flags & OPf_STACKED)
a0d0e21e 956 break;
5aabfad6 957 /* FALL THROUGH */
79072805
LW		 958 case OP_ENTERTRY:
959 case OP_ENTER:
960 case OP_SCALAR:
11343788 961 if (!(o->op_flags & OPf_KIDS))
79072805 962 break;
54310121 963 /* FALL THROUGH */
463ee0b2 964 case OP_SCOPE:
79072805
LW		 965 case OP_LEAVE:
966 case OP_LEAVETRY:
a0d0e21e 967 case OP_LEAVELOOP:
79072805 968 case OP_LINESEQ:
79072805 969 case OP_LIST:
11343788 970 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 971 scalarvoid(kid);
972 break;
c90c0ff4 973 case OP_ENTEREVAL:
5196be3e 974 scalarkids(o);
c90c0ff4 975 break;
5aabfad6 976 case OP_REQUIRE:
c90c0ff4 977 /* all requires must return a boolean value */
5196be3e
MB		 978 o->op_flags &= ~OPf_WANT;
979 return scalar(o);
a0d0e21e 980 case OP_SPLIT:
11343788 981 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 982 if (!kPMOP->op_pmreplroot)
983 deprecate("implicit split to @_");
984 }
985 break;
79072805 986 }
3280af22 987 if (useless && PL_dowarn)
8990e307 988 warn("Useless use of %s in void context", useless);
11343788 989 return o;
79072805
LW		 990}
991
992OP *
8ac85365 993listkids(OP *o)
79072805
LW		 994{
995 OP *kid;
11343788
MB		 996 if (o && o->op_flags & OPf_KIDS) {
997 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 998 list(kid);
999 }
11343788 1000 return o;
79072805
LW		 1001}
1002
1003OP *
8ac85365 1004list(OP *o)
79072805
LW		 1005{
1006 OP *kid;
1007
a0d0e21e 1008 /* assumes no premature commitment */
3280af22 1009 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 1010 || o->op_type == OP_RETURN)
11343788 1011 return o;
79072805 1012
5dc0d613 1013 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 1014
11343788 1015 switch (o->op_type) {
79072805
LW		 1016 case OP_FLOP:
1017 case OP_REPEAT:
11343788 1018 list(cBINOPo->op_first);
79072805
LW		 1019 break;
1020 case OP_OR:
1021 case OP_AND:
1022 case OP_COND_EXPR:
11343788 1023 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1024 list(kid);
1025 break;
1026 default:
1027 case OP_MATCH:
8782bef2 1028 case OP_QR:
79072805
LW		 1029 case OP_SUBST:
1030 case OP_NULL:
11343788 1031 if (!(o->op_flags & OPf_KIDS))
79072805 1032 break;
11343788
MB		 1033 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
1034 list(cBINOPo->op_first);
1035 return gen_constant_list(o);
79072805
LW		 1036 }
1037 case OP_LIST:
11343788 1038 listkids(o);
79072805
LW		 1039 break;
1040 case OP_LEAVE:
1041 case OP_LEAVETRY:
5dc0d613 1042 kid = cLISTOPo->op_first;
54310121 1043 list(kid);
1044 while (kid = kid->op_sibling) {
1045 if (kid->op_sibling)
1046 scalarvoid(kid);
1047 else
1048 list(kid);
1049 }
3280af22 1050 WITH_THR(PL_curcop = &PL_compiling);
54310121 1051 break;
748a9306 1052 case OP_SCOPE:
79072805 1053 case OP_LINESEQ:
11343788 1054 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 1055 if (kid->op_sibling)
1056 scalarvoid(kid);
1057 else
1058 list(kid);
1059 }
3280af22 1060 WITH_THR(PL_curcop = &PL_compiling);
79072805 1061 break;
c90c0ff4 1062 case OP_REQUIRE:
1063 /* all requires must return a boolean value */
5196be3e
MB		 1064 o->op_flags &= ~OPf_WANT;
1065 return scalar(o);
79072805 1066 }
11343788 1067 return o;
79072805
LW		 1068}
1069
1070OP *
8ac85365 1071scalarseq(OP *o)
79072805
LW		 1072{
1073 OP *kid;
1074
11343788
MB		 1075 if (o) {
1076 if (o->op_type == OP_LINESEQ ||
1077 o->op_type == OP_SCOPE ||
1078 o->op_type == OP_LEAVE ||
1079 o->op_type == OP_LEAVETRY)
463ee0b2 1080 {
0f15f207 1081 dTHR;
11343788 1082 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1083 if (kid->op_sibling) {
463ee0b2 1084 scalarvoid(kid);
ed6116ce 1085 }
463ee0b2 1086 }
3280af22 1087 PL_curcop = &PL_compiling;
79072805 1088 }
11343788 1089 o->op_flags &= ~OPf_PARENS;
3280af22 1090 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 1091 o->op_flags |= OPf_PARENS;
79072805 1092 }
8990e307 1093 else
11343788
MB		 1094 o = newOP(OP_STUB, 0);
1095 return o;
79072805
LW		 1096}
1097
76e3520e 1098STATIC OP *
8ac85365 1099modkids(OP *o, I32 type)
79072805
LW		 1100{
1101 OP *kid;
11343788
MB		 1102 if (o && o->op_flags & OPf_KIDS) {
1103 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1104 mod(kid, type);
79072805 1105 }
11343788 1106 return o;
79072805
LW		 1107}
1108
79072805 1109OP *
8ac85365 1110mod(OP *o, I32 type)
79072805 1111{
11343788 1112 dTHR;
79072805
LW		 1113 OP *kid;
1114 SV *sv;
1115
3280af22 1116 if (!o || PL_error_count)
11343788 1117 return o;
79072805 1118
11343788 1119 switch (o->op_type) {
68dc0745 1120 case OP_UNDEF:
3280af22 1121 PL_modcount++;
5dc0d613 1122 return o;
a0d0e21e 1123 case OP_CONST:
11343788 1124 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e 1125 goto nomod;
3280af22
NIS		 1126 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
1127 PL_compiling.cop_arybase = (I32)SvIV(((SVOP*)PL_eval_start)->op_sv);
1128 PL_eval_start = 0;
a0d0e21e
LW		 1129 }
1130 else if (!type) {
3280af22
NIS		 1131 SAVEI32(PL_compiling.cop_arybase);
1132 PL_compiling.cop_arybase = 0;
a0d0e21e
LW		 1133 }
1134 else if (type == OP_REFGEN)
1135 goto nomod;
1136 else
1137 croak("That use of $[ is unsupported");
1138 break;
5f05dabc 1139 case OP_STUB:
5196be3e 1140 if (o->op_flags & OPf_PARENS)
5f05dabc 1141 break;
1142 goto nomod;
a0d0e21e
LW		 1143 case OP_ENTERSUB:
1144 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1145 !(o->op_flags & OPf_STACKED)) {
1146 o->op_type = OP_RV2CV; /* entersub => rv2cv */
1147 o->op_ppaddr = ppaddr[OP_RV2CV];
1148 assert(cUNOPo->op_first->op_type == OP_NULL);
1149 null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1150 break;
1151 }
1152 /* FALL THROUGH */
1153 default:
a0d0e21e
LW		 1154 nomod:
1155 /* grep, foreach, subcalls, refgen */
1156 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1157 break;
46fc3d4c 1158 yyerror(form("Can't modify %s in %s",
5dc0d613 1159 op_desc[o->op_type],
46fc3d4c 1160 type ? op_desc[type] : "local"));
11343788 1161 return o;
79072805 1162
a0d0e21e
LW		 1163 case OP_PREINC:
1164 case OP_PREDEC:
1165 case OP_POW:
1166 case OP_MULTIPLY:
1167 case OP_DIVIDE:
1168 case OP_MODULO:
1169 case OP_REPEAT:
1170 case OP_ADD:
1171 case OP_SUBTRACT:
1172 case OP_CONCAT:
1173 case OP_LEFT_SHIFT:
1174 case OP_RIGHT_SHIFT:
1175 case OP_BIT_AND:
1176 case OP_BIT_XOR:
1177 case OP_BIT_OR:
1178 case OP_I_MULTIPLY:
1179 case OP_I_DIVIDE:
1180 case OP_I_MODULO:
1181 case OP_I_ADD:
1182 case OP_I_SUBTRACT:
11343788 1183 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1184 goto nomod;
3280af22 1185 PL_modcount++;
a0d0e21e
LW		 1186 break;
1187
79072805 1188 case OP_COND_EXPR:
11343788 1189 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1190 mod(kid, type);
79072805
LW		 1191 break;
1192
1193 case OP_RV2AV:
1194 case OP_RV2HV:
93af7a87 1195 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1196 croak("Can't localize through a reference");
11343788 1197 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
3280af22 1198 PL_modcount = 10000;
11343788 1199 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1200 }
1201 /* FALL THROUGH */
79072805 1202 case OP_RV2GV:
5dc0d613 1203 if (scalar_mod_type(o, type))
3fe9a6f1 1204 goto nomod;
11343788 1205 ref(cUNOPo->op_first, o->op_type);
79072805
LW		 1206 /* FALL THROUGH */
1207 case OP_AASSIGN:
1208 case OP_ASLICE:
1209 case OP_HSLICE:
93a17b20
LW		 1210 case OP_NEXTSTATE:
1211 case OP_DBSTATE:
a0d0e21e
LW		 1212 case OP_REFGEN:
1213 case OP_CHOMP:
3280af22 1214 PL_modcount = 10000;
79072805 1215 break;
463ee0b2 1216 case OP_RV2SV:
11343788 1217 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1218 croak("Can't localize through a reference");
aeea060c 1219 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1220 /* FALL THROUGH */
79072805 1221 case OP_GV:
463ee0b2 1222 case OP_AV2ARYLEN:
3280af22 1223 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1224 case OP_SASSIGN:
8990e307 1225 case OP_AELEMFAST:
3280af22 1226 PL_modcount++;
8990e307
LW		 1227 break;
1228
748a9306
LW		 1229 case OP_PADAV:
1230 case OP_PADHV:
3280af22 1231 PL_modcount = 10000;
5196be3e
MB		 1232 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1233 return o; /* Treat \(@foo) like ordinary list. */
1234 if (scalar_mod_type(o, type))
3fe9a6f1 1235 goto nomod;
748a9306
LW		 1236 /* FALL THROUGH */
1237 case OP_PADSV:
3280af22 1238 PL_modcount++;
748a9306
LW		 1239 if (!type)
1240 croak("Can't localize lexical variable %s",
3280af22 1241 SvPV(*av_fetch(PL_comppad_name, o->op_targ, 4), PL_na));
463ee0b2
LW		 1242 break;
1243
554b3eca 1244#ifdef USE_THREADS
2faa37cc 1245 case OP_THREADSV:
533c011a 1246 PL_modcount++; /* XXX ??? */
554b3eca
MB		 1247 break;
1248#endif /* USE_THREADS */
1249
748a9306
LW		 1250 case OP_PUSHMARK:
1251 break;
a0d0e21e 1252
69969c6f
SB		 1253 case OP_KEYS:
1254 if (type != OP_SASSIGN)
1255 goto nomod;
5d82c453
GA		 1256 goto lvalue_func;
1257 case OP_SUBSTR:
1258 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1259 goto nomod;
5f05dabc 1260 /* FALL THROUGH */
a0d0e21e 1261 case OP_POS:
463ee0b2 1262 case OP_VEC:
5d82c453 1263 lvalue_func:
11343788
MB		 1264 pad_free(o->op_targ);
1265 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1266 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1267 if (o->op_flags & OPf_KIDS)
1268 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1269 break;
a0d0e21e 1270
463ee0b2
LW		 1271 case OP_AELEM:
1272 case OP_HELEM:
11343788 1273 ref(cBINOPo->op_first, o->op_type);
68dc0745 1274 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1275 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1276 o->op_private |= OPpLVAL_DEFER;
3280af22 1277 PL_modcount++;
463ee0b2
LW		 1278 break;
1279
1280 case OP_SCOPE:
1281 case OP_LEAVE:
1282 case OP_ENTER:
11343788
MB		 1283 if (o->op_flags & OPf_KIDS)
1284 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1285 break;
1286
1287 case OP_NULL:
11343788 1288 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1289 break;
11343788
MB		 1290 if (o->op_targ != OP_LIST) {
1291 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1292 break;
1293 }
1294 /* FALL THROUGH */
463ee0b2 1295 case OP_LIST:
11343788 1296 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1297 mod(kid, type);
1298 break;
1299 }
11343788 1300 o->op_flags |= OPf_MOD;
a0d0e21e
LW		 1301
1302 if (type == OP_AASSIGN || type == OP_SASSIGN)
11343788 1303 o->op_flags |= OPf_SPECIAL|OPf_REF;
a0d0e21e 1304 else if (!type) {
11343788
MB		 1305 o->op_private |= OPpLVAL_INTRO;
1306 o->op_flags &= ~OPf_SPECIAL;
3280af22 1307 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1308 }
a0d0e21e 1309 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
11343788
MB		 1310 o->op_flags |= OPf_REF;
1311 return o;
463ee0b2
LW		 1312}
1313
3fe9a6f1 1314static bool
8ac85365 1315scalar_mod_type(OP *o, I32 type)
3fe9a6f1 1316{
1317 switch (type) {
1318 case OP_SASSIGN:
5196be3e 1319 if (o->op_type == OP_RV2GV)
3fe9a6f1 1320 return FALSE;
1321 /* FALL THROUGH */
1322 case OP_PREINC:
1323 case OP_PREDEC:
1324 case OP_POSTINC:
1325 case OP_POSTDEC:
1326 case OP_I_PREINC:
1327 case OP_I_PREDEC:
1328 case OP_I_POSTINC:
1329 case OP_I_POSTDEC:
1330 case OP_POW:
1331 case OP_MULTIPLY:
1332 case OP_DIVIDE:
1333 case OP_MODULO:
1334 case OP_REPEAT:
1335 case OP_ADD:
1336 case OP_SUBTRACT:
1337 case OP_I_MULTIPLY:
1338 case OP_I_DIVIDE:
1339 case OP_I_MODULO:
1340 case OP_I_ADD:
1341 case OP_I_SUBTRACT:
1342 case OP_LEFT_SHIFT:
1343 case OP_RIGHT_SHIFT:
1344 case OP_BIT_AND:
1345 case OP_BIT_XOR:
1346 case OP_BIT_OR:
1347 case OP_CONCAT:
1348 case OP_SUBST:
1349 case OP_TRANS:
49e9fbe6
GS		 1350 case OP_READ:
1351 case OP_SYSREAD:
1352 case OP_RECV:
3fe9a6f1 1353 case OP_ANDASSIGN: /* may work later */
1354 case OP_ORASSIGN: /* may work later */
1355 return TRUE;
1356 default:
1357 return FALSE;
1358 }
1359}
1360
463ee0b2 1361OP *
8ac85365 1362refkids(OP *o, I32 type)
463ee0b2
LW		 1363{
1364 OP *kid;
11343788
MB		 1365 if (o && o->op_flags & OPf_KIDS) {
1366 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1367 ref(kid, type);
1368 }
11343788 1369 return o;
463ee0b2
LW		 1370}
1371
1372OP *
8ac85365 1373ref(OP *o, I32 type)
463ee0b2
LW		 1374{
1375 OP *kid;
463ee0b2 1376
3280af22 1377 if (!o || PL_error_count)
11343788 1378 return o;
463ee0b2 1379
11343788 1380 switch (o->op_type) {
a0d0e21e 1381 case OP_ENTERSUB:
e55aaa0e 1382 if ((type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1383 !(o->op_flags & OPf_STACKED)) {
1384 o->op_type = OP_RV2CV; /* entersub => rv2cv */
1385 o->op_ppaddr = ppaddr[OP_RV2CV];
1386 assert(cUNOPo->op_first->op_type == OP_NULL);
1387 null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
1388 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1389 }
1390 break;
aeea060c 1391
463ee0b2 1392 case OP_COND_EXPR:
11343788 1393 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1394 ref(kid, type);
1395 break;
8990e307 1396 case OP_RV2SV:
11343788 1397 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1398 /* FALL THROUGH */
1399 case OP_PADSV:
5f05dabc 1400 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1401 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1402 : type == OP_RV2HV ? OPpDEREF_HV
1403 : OPpDEREF_SV);
11343788 1404 o->op_flags |= OPf_MOD;
a0d0e21e 1405 }
8990e307
LW		 1406 break;
1407
2faa37cc 1408 case OP_THREADSV:
a863c7d1
MB		 1409 o->op_flags |= OPf_MOD; /* XXX ??? */
1410 break;
1411
463ee0b2
LW		 1412 case OP_RV2AV:
1413 case OP_RV2HV:
aeea060c 1414 o->op_flags |= OPf_REF;
8990e307 1415 /* FALL THROUGH */
463ee0b2 1416 case OP_RV2GV:
11343788 1417 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1418 break;
8990e307 1419
463ee0b2
LW		 1420 case OP_PADAV:
1421 case OP_PADHV:
aeea060c 1422 o->op_flags |= OPf_REF;
79072805 1423 break;
aeea060c 1424
8990e307 1425 case OP_SCALAR:
79072805 1426 case OP_NULL:
11343788 1427 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1428 break;
11343788 1429 ref(cBINOPo->op_first, type);
79072805
LW		 1430 break;
1431 case OP_AELEM:
1432 case OP_HELEM:
11343788 1433 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1434 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1435 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1436 : type == OP_RV2HV ? OPpDEREF_HV
1437 : OPpDEREF_SV);
11343788 1438 o->op_flags |= OPf_MOD;
8990e307 1439 }
79072805
LW		 1440 break;
1441
463ee0b2 1442 case OP_SCOPE:
79072805
LW		 1443 case OP_LEAVE:
1444 case OP_ENTER:
8990e307 1445 case OP_LIST:
11343788 1446 if (!(o->op_flags & OPf_KIDS))
79072805 1447 break;
11343788 1448 ref(cLISTOPo->op_last, type);
79072805 1449 break;
a0d0e21e
LW		 1450 default:
1451 break;
79072805 1452 }
11343788 1453 return scalar(o);
8990e307 1454
79072805
LW		 1455}
1456
1457OP *
8ac85365 1458my(OP *o)
93a17b20
LW		 1459{
1460 OP *kid;
93a17b20
LW		 1461 I32 type;
1462
3280af22 1463 if (!o || PL_error_count)
11343788 1464 return o;
93a17b20 1465
11343788 1466 type = o->op_type;
93a17b20 1467 if (type == OP_LIST) {
11343788 1468 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
93a17b20 1469 my(kid);
dab48698 1470 } else if (type == OP_UNDEF) {
7766148a 1471 return o;
dab48698 1472 } else if (type != OP_PADSV &&
93a17b20
LW		 1473 type != OP_PADAV &&
1474 type != OP_PADHV &&
1475 type != OP_PUSHMARK)
1476 {
5dc0d613 1477 yyerror(form("Can't declare %s in my", op_desc[o->op_type]));
11343788 1478 return o;
93a17b20 1479 }
11343788
MB		 1480 o->op_flags |= OPf_MOD;
1481 o->op_private |= OPpLVAL_INTRO;
1482 return o;
93a17b20
LW		 1483}
1484
1485OP *
8ac85365 1486sawparens(OP *o)
79072805
LW		 1487{
1488 if (o)
1489 o->op_flags |= OPf_PARENS;
1490 return o;
1491}
1492
1493OP *
8ac85365 1494bind_match(I32 type, OP *left, OP *right)
79072805 1495{
11343788 1496 OP *o;
79072805 1497
3280af22 1498 if (PL_dowarn &&
2ae324a7 1499 (left->op_type == OP_RV2AV ||
1500 left->op_type == OP_RV2HV ||
1501 left->op_type == OP_PADAV ||
1502 left->op_type == OP_PADHV)) {
1503 char *desc = op_desc[(right->op_type == OP_SUBST ||
1504 right->op_type == OP_TRANS)
1505 ? right->op_type : OP_MATCH];
1506 char *sample = ((left->op_type == OP_RV2AV ||
1507 left->op_type == OP_PADAV)
1508 ? "@array" : "%hash");
1509 warn("Applying %s to %s will act on scalar(%s)", desc, sample, sample);
1510 }
1511
79072805
LW		 1512 if (right->op_type == OP_MATCH ||
1513 right->op_type == OP_SUBST ||
1514 right->op_type == OP_TRANS) {
1515 right->op_flags |= OPf_STACKED;
1516 if (right->op_type != OP_MATCH)
463ee0b2 1517 left = mod(left, right->op_type);
79072805 1518 if (right->op_type == OP_TRANS)
11343788 1519 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1520 else
11343788 1521 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1522 if (type == OP_NOT)
11343788
MB		 1523 return newUNOP(OP_NOT, 0, scalar(o));
1524 return o;
79072805
LW		 1525 }
1526 else
1527 return bind_match(type, left,
1528 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1529}
1530
1531OP *
8ac85365 1532invert(OP *o)
79072805 1533{
11343788
MB		 1534 if (!o)
1535 return o;
79072805 1536 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1537 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1538}
1539
1540OP *
8ac85365 1541scope(OP *o)
79072805
LW		 1542{
1543 if (o) {
3280af22 1544 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1545 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1546 o->op_type = OP_LEAVE;
1547 o->op_ppaddr = ppaddr[OP_LEAVE];
1548 }
1549 else {
1550 if (o->op_type == OP_LINESEQ) {
1551 OP *kid;
1552 o->op_type = OP_SCOPE;
1553 o->op_ppaddr = ppaddr[OP_SCOPE];
1554 kid = ((LISTOP*)o)->op_first;
748a9306
LW		 1555 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
1556 SvREFCNT_dec(((COP*)kid)->cop_filegv);
8990e307 1557 null(kid);
748a9306 1558 }
463ee0b2
LW		 1559 }
1560 else
748a9306 1561 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1562 }
79072805
LW		 1563 }
1564 return o;
1565}
1566
b3ac6de7
IZ		 1567void
1568save_hints(void)
1569{
3280af22
NIS		 1570 SAVEI32(PL_hints);
1571 SAVESPTR(GvHV(PL_hintgv));
1572 GvHV(PL_hintgv) = newHVhv(GvHV(PL_hintgv));
1573 SAVEFREESV(GvHV(PL_hintgv));
b3ac6de7
IZ		 1574}
1575
a0d0e21e 1576int
8ac85365 1577block_start(int full)
79072805 1578{
11343788 1579 dTHR;
3280af22 1580 int retval = PL_savestack_ix;
b3ac6de7 1581
3280af22 1582 SAVEI32(PL_comppad_name_floor);
55497cff 1583 if (full) {
3280af22
NIS		 1584 if ((PL_comppad_name_fill = AvFILLp(PL_comppad_name)) > 0)
1585 PL_comppad_name_floor = PL_comppad_name_fill;
55497cff 1586 else
3280af22
NIS		 1587 PL_comppad_name_floor = 0;
1588 }
1589 SAVEI32(PL_min_intro_pending);
1590 SAVEI32(PL_max_intro_pending);
1591 PL_min_intro_pending = 0;
1592 SAVEI32(PL_comppad_name_fill);
1593 SAVEI32(PL_padix_floor);
1594 PL_padix_floor = PL_padix;
1595 PL_pad_reset_pending = FALSE;
b3ac6de7 1596 SAVEHINTS();
3280af22 1597 PL_hints &= ~HINT_BLOCK_SCOPE;
a0d0e21e
LW		 1598 return retval;
1599}
1600
1601OP*
8ac85365 1602block_end(I32 floor, OP *seq)
a0d0e21e 1603{
11343788 1604 dTHR;
3280af22 1605 int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
a0d0e21e 1606 OP* retval = scalarseq(seq);
a0d0e21e 1607 LEAVE_SCOPE(floor);
3280af22 1608 PL_pad_reset_pending = FALSE;
a0d0e21e 1609 if (needblockscope)
3280af22
NIS		 1610 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
1611 pad_leavemy(PL_comppad_name_fill);
1612 PL_cop_seqmax++;
a0d0e21e
LW		 1613 return retval;
1614}
1615
76e3520e 1616STATIC OP *
54b9620d
MB		 1617newDEFSVOP(void)
1618{
1619#ifdef USE_THREADS
1620 OP *o = newOP(OP_THREADSV, 0);
1621 o->op_targ = find_threadsv("_");
1622 return o;
1623#else
3280af22 1624 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
54b9620d
MB		 1625#endif /* USE_THREADS */
1626}
1627
a0d0e21e 1628void
8ac85365 1629newPROG(OP *o)
a0d0e21e 1630{
11343788 1631 dTHR;
3280af22
NIS		 1632 if (PL_in_eval) {
1633 PL_eval_root = newUNOP(OP_LEAVEEVAL, ((PL_in_eval & 4) ? OPf_SPECIAL : 0), o);
1634 PL_eval_start = linklist(PL_eval_root);
1635 PL_eval_root->op_next = 0;
1636 peep(PL_eval_start);
a0d0e21e
LW		 1637 }
1638 else {
5dc0d613 1639 if (!o)
a0d0e21e 1640 return;
3280af22
NIS		 1641 PL_main_root = scope(sawparens(scalarvoid(o)));
1642 PL_curcop = &PL_compiling;
1643 PL_main_start = LINKLIST(PL_main_root);
1644 PL_main_root->op_next = 0;
1645 peep(PL_main_start);
1646 PL_compcv = 0;
3841441e 1647
4fdae800 1648 /* Register with debugger */
84902520 1649 if (PERLDB_INTER) {
3841441e 1650 CV *cv = perl_get_cv("DB::postponed", FALSE);
3841441e
CS		 1651 if (cv) {
1652 dSP;
924508f0 1653 PUSHMARK(SP);
3280af22 1654 XPUSHs((SV*)PL_compiling.cop_filegv);
3841441e
CS		 1655 PUTBACK;
1656 perl_call_sv((SV*)cv, G_DISCARD);
1657 }
1658 }
79072805 1659 }
79072805
LW		 1660}
1661
1662OP *
8ac85365 1663localize(OP *o, I32 lex)
79072805
LW		 1664{
1665 if (o->op_flags & OPf_PARENS)
1666 list(o);
8990e307 1667 else {
3280af22 1668 if (PL_dowarn && PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ',') {
8990e307 1669 char *s;
3280af22 1670 for (s = PL_bufptr; *s && (isALNUM(*s) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1671 if (*s == ';' || *s == '=')
8990e307
LW		 1672 warn("Parens missing around \"%s\" list", lex ? "my" : "local");
1673 }
1674 }
3280af22
NIS		 1675 PL_in_my = FALSE;
1676 PL_in_my_stash = Nullhv;
93a17b20
LW		 1677 if (lex)
1678 return my(o);
1679 else
463ee0b2 1680 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 1681}
1682
1683OP *
8ac85365 1684jmaybe(OP *o)
79072805
LW		 1685{
1686 if (o->op_type == OP_LIST) {
554b3eca
MB		 1687 OP *o2;
1688#ifdef USE_THREADS
2faa37cc 1689 o2 = newOP(OP_THREADSV, 0);
54b9620d 1690 o2->op_targ = find_threadsv(";");
554b3eca
MB		 1691#else
1692 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
1693#endif /* USE_THREADS */
1694 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 1695 }
1696 return o;
1697}
1698
1699OP *
8ac85365 1700fold_constants(register OP *o)
79072805 1701{
11343788 1702 dTHR;
79072805
LW		 1703 register OP *curop;
1704 I32 type = o->op_type;
748a9306 1705 SV *sv;
79072805
LW		 1706
1707 if (opargs[type] & OA_RETSCALAR)
1708 scalar(o);
1709 if (opargs[type] & OA_TARGET)
ed6116ce 1710 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1711
3280af22 1712 if ((opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER))
a0d0e21e 1713 o->op_ppaddr = ppaddr[type = ++(o->op_type)];
85e6fe83 1714
79072805
LW		 1715 if (!(opargs[type] & OA_FOLDCONST))
1716 goto nope;
1717
de939608
CS		 1718 switch (type) {
1719 case OP_SPRINTF:
1720 case OP_UCFIRST:
1721 case OP_LCFIRST:
1722 case OP_UC:
1723 case OP_LC:
69dcf70c
MB		 1724 case OP_SLT:
1725 case OP_SGT:
1726 case OP_SLE:
1727 case OP_SGE:
1728 case OP_SCMP:
1729
de939608
CS		 1730 if (o->op_private & OPpLOCALE)
1731 goto nope;
1732 }
1733
3280af22 1734 if (PL_error_count)
a0d0e21e
LW		 1735 goto nope; /* Don't try to run w/ errors */
1736
79072805 1737 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
93a17b20
LW		 1738 if (curop->op_type != OP_CONST &&
1739 curop->op_type != OP_LIST &&
1740 curop->op_type != OP_SCALAR &&
a0d0e21e 1741 curop->op_type != OP_NULL &&
93a17b20 1742 curop->op_type != OP_PUSHMARK) {
79072805
LW		 1743 goto nope;
1744 }
1745 }
1746
1747 curop = LINKLIST(o);
1748 o->op_next = 0;
533c011a 1749 PL_op = curop;
76e3520e 1750 CALLRUNOPS();
3280af22 1751 sv = *(PL_stack_sp--);
748a9306 1752 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 1753 pad_swipe(o->op_targ);
748a9306
LW		 1754 else if (SvTEMP(sv)) { /* grab mortal temp? */
1755 (void)SvREFCNT_inc(sv);
1756 SvTEMP_off(sv);
85e6fe83 1757 }
79072805
LW		 1758 op_free(o);
1759 if (type == OP_RV2GV)
b1cb66bf 1760 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306 1761 else {
ee580363
GS		 1762 /* try to smush double to int, but don't smush -2.0 to -2 */
1763 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK &&
1764 type != OP_NEGATE)
1765 {
748a9306 1766 IV iv = SvIV(sv);
ee580363 1767 if ((double)iv == SvNV(sv)) {
748a9306
LW		 1768 SvREFCNT_dec(sv);
1769 sv = newSViv(iv);
1770 }
b1cb66bf 1771 else
1772 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 1773 }
1774 return newSVOP(OP_CONST, 0, sv);
1775 }
aeea060c 1776
79072805
LW		 1777 nope:
1778 if (!(opargs[type] & OA_OTHERINT))
1779 return o;
79072805 1780
3280af22 1781 if (!(PL_hints & HINT_INTEGER)) {
a0d0e21e 1782 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 1783 return o;
1784
1785 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
1786 if (curop->op_type == OP_CONST) {
b1cb66bf 1787 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 1788 continue;
1789 return o;
1790 }
1791 if (opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 1792 continue;
1793 return o;
1794 }
a0d0e21e 1795 o->op_ppaddr = ppaddr[++(o->op_type)];
79072805
LW		 1796 }
1797
79072805
LW		 1798 return o;
1799}
1800
1801OP *
8ac85365 1802gen_constant_list(register OP *o)
79072805 1803{
11343788 1804 dTHR;
79072805 1805 register OP *curop;
3280af22 1806 I32 oldtmps_floor = PL_tmps_floor;
79072805 1807
a0d0e21e 1808 list(o);
3280af22 1809 if (PL_error_count)
a0d0e21e
LW		 1810 return o; /* Don't attempt to run with errors */
1811
533c011a 1812 PL_op = curop = LINKLIST(o);
a0d0e21e 1813 o->op_next = 0;
11343788 1814 pp_pushmark(ARGS);
76e3520e 1815 CALLRUNOPS();
533c011a 1816 PL_op = curop;
11343788 1817 pp_anonlist(ARGS);
3280af22 1818 PL_tmps_floor = oldtmps_floor;
79072805
LW		 1819
1820 o->op_type = OP_RV2AV;
1821 o->op_ppaddr = ppaddr[OP_RV2AV];
79072805 1822 curop = ((UNOP*)o)->op_first;
3280af22 1823 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*PL_stack_sp--));
79072805 1824 op_free(curop);
79072805
LW		 1825 linklist(o);
1826 return list(o);
1827}
1828
1829OP *
8ac85365 1830convert(I32 type, I32 flags, OP *o)
79072805
LW		 1831{
1832 OP *kid;
a0d0e21e 1833 OP *last = 0;
79072805 1834
11343788
MB		 1835 if (!o || o->op_type != OP_LIST)
1836 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 1837 else
5dc0d613 1838 o->op_flags &= ~OPf_WANT;
79072805 1839
8990e307 1840 if (!(opargs[type] & OA_MARK))
11343788 1841 null(cLISTOPo->op_first);
8990e307 1842
11343788
MB		 1843 o->op_type = type;
1844 o->op_ppaddr = ppaddr[type];
1845 o->op_flags |= flags;
79072805 1846
11343788
MB		 1847 o = CHECKOP(type, o);
1848 if (o->op_type != type)
1849 return o;
79072805 1850
11343788 1851 if (cLISTOPo->op_children < 7) {
79072805 1852 /* XXX do we really need to do this if we're done appending?? */
11343788 1853 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805 1854 last = kid;
11343788 1855 cLISTOPo->op_last = last; /* in case check substituted last arg */
79072805
LW		 1856 }
1857
11343788 1858 return fold_constants(o);
79072805
LW		 1859}
1860
1861/* List constructors */
1862
1863OP *
8ac85365 1864append_elem(I32 type, OP *first, OP *last)
79072805
LW		 1865{
1866 if (!first)
1867 return last;
8990e307
LW		 1868
1869 if (!last)
79072805 1870 return first;
8990e307 1871
a0d0e21e
LW		 1872 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
1873 return newLISTOP(type, 0, first, last);
79072805 1874
a0d0e21e
LW		 1875 if (first->op_flags & OPf_KIDS)
1876 ((LISTOP*)first)->op_last->op_sibling = last;
1877 else {
1878 first->op_flags |= OPf_KIDS;
1879 ((LISTOP*)first)->op_first = last;
1880 }
1881 ((LISTOP*)first)->op_last = last;
1882 ((LISTOP*)first)->op_children++;
1883 return first;
79072805
LW		 1884}
1885
1886OP *
8ac85365 1887append_list(I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 1888{
1889 if (!first)
1890 return (OP*)last;
8990e307
LW		 1891
1892 if (!last)
79072805 1893 return (OP*)first;
8990e307
LW		 1894
1895 if (first->op_type != type)
79072805 1896 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 1897
1898 if (last->op_type != type)
79072805
LW		 1899 return append_elem(type, (OP*)first, (OP*)last);
1900
1901 first->op_last->op_sibling = last->op_first;
1902 first->op_last = last->op_last;
1903 first->op_children += last->op_children;
1904 if (first->op_children)
b51d6ca4 1905 first->op_flags |= OPf_KIDS;
79072805
LW		 1906
1907 Safefree(last);
1908 return (OP*)first;
1909}
1910
1911OP *
8ac85365 1912prepend_elem(I32 type, OP *first, OP *last)
79072805
LW		 1913{
1914 if (!first)
1915 return last;
8990e307
LW		 1916
1917 if (!last)
79072805 1918 return first;
8990e307
LW		 1919
1920 if (last->op_type == type) {
1921 if (type == OP_LIST) { /* already a PUSHMARK there */
1922 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
1923 ((LISTOP*)last)->op_first->op_sibling = first;
1924 }
1925 else {
1926 if (!(last->op_flags & OPf_KIDS)) {
1927 ((LISTOP*)last)->op_last = first;
1928 last->op_flags |= OPf_KIDS;
1929 }
1930 first->op_sibling = ((LISTOP*)last)->op_first;
1931 ((LISTOP*)last)->op_first = first;
79072805 1932 }
79072805
LW		 1933 ((LISTOP*)last)->op_children++;
1934 return last;
1935 }
1936
1937 return newLISTOP(type, 0, first, last);
1938}
1939
1940/* Constructors */
1941
1942OP *
8ac85365 1943newNULLLIST(void)
79072805 1944{
8990e307
LW		 1945 return newOP(OP_STUB, 0);
1946}
1947
1948OP *
8ac85365 1949force_list(OP *o)
8990e307 1950{
11343788
MB		 1951 if (!o || o->op_type != OP_LIST)
1952 o = newLISTOP(OP_LIST, 0, o, Nullop);
1953 null(o);
1954 return o;
79072805
LW		 1955}
1956
1957OP *
8ac85365 1958newLISTOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 1959{
1960 LISTOP *listop;
1961
1962 Newz(1101, listop, 1, LISTOP);
1963
1964 listop->op_type = type;
1965 listop->op_ppaddr = ppaddr[type];
1966 listop->op_children = (first != 0) + (last != 0);
1967 listop->op_flags = flags;
79072805
LW		 1968
1969 if (!last && first)
1970 last = first;
1971 else if (!first && last)
1972 first = last;
8990e307
LW		 1973 else if (first)
1974 first->op_sibling = last;
79072805
LW		 1975 listop->op_first = first;
1976 listop->op_last = last;
8990e307
LW		 1977 if (type == OP_LIST) {
1978 OP* pushop;
1979 pushop = newOP(OP_PUSHMARK, 0);
1980 pushop->op_sibling = first;
1981 listop->op_first = pushop;
1982 listop->op_flags |= OPf_KIDS;
1983 if (!last)
1984 listop->op_last = pushop;
1985 }
1986 else if (listop->op_children)
1987 listop->op_flags |= OPf_KIDS;
79072805
LW		 1988
1989 return (OP*)listop;
1990}
1991
1992OP *
8ac85365 1993newOP(I32 type, I32 flags)
79072805 1994{
11343788
MB		 1995 OP *o;
1996 Newz(1101, o, 1, OP);
1997 o->op_type = type;
1998 o->op_ppaddr = ppaddr[type];
1999 o->op_flags = flags;
79072805 2000
11343788
MB		 2001 o->op_next = o;
2002 o->op_private = 0 + (flags >> 8);
79072805 2003 if (opargs[type] & OA_RETSCALAR)
11343788 2004 scalar(o);
79072805 2005 if (opargs[type] & OA_TARGET)
11343788
MB		 2006 o->op_targ = pad_alloc(type, SVs_PADTMP);
2007 return CHECKOP(type, o);
79072805
LW		 2008}
2009
2010OP *
8ac85365 2011newUNOP(I32 type, I32 flags, OP *first)
79072805
LW		 2012{
2013 UNOP *unop;
2014
93a17b20 2015 if (!first)
aeea060c 2016 first = newOP(OP_STUB, 0);
8990e307
LW		 2017 if (opargs[type] & OA_MARK)
2018 first = force_list(first);
93a17b20 2019
79072805
LW		 2020 Newz(1101, unop, 1, UNOP);
2021 unop->op_type = type;
2022 unop->op_ppaddr = ppaddr[type];
2023 unop->op_first = first;
2024 unop->op_flags = flags | OPf_KIDS;
c07a80fd 2025 unop->op_private = 1 | (flags >> 8);
e50aee73 2026 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2027 if (unop->op_next)
2028 return (OP*)unop;
2029
a0d0e21e 2030 return fold_constants((OP *) unop);
79072805
LW		 2031}
2032
2033OP *
8ac85365 2034newBINOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2035{
2036 BINOP *binop;
2037 Newz(1101, binop, 1, BINOP);
2038
2039 if (!first)
2040 first = newOP(OP_NULL, 0);
2041
2042 binop->op_type = type;
2043 binop->op_ppaddr = ppaddr[type];
2044 binop->op_first = first;
2045 binop->op_flags = flags | OPf_KIDS;
2046 if (!last) {
2047 last = first;
c07a80fd 2048 binop->op_private = 1 | (flags >> 8);
79072805
LW		 2049 }
2050 else {
c07a80fd 2051 binop->op_private = 2 | (flags >> 8);
79072805
LW		 2052 first->op_sibling = last;
2053 }
2054
e50aee73 2055 binop = (BINOP*)CHECKOP(type, binop);
79072805
LW		 2056 if (binop->op_next)
2057 return (OP*)binop;
2058
2059 binop->op_last = last = binop->op_first->op_sibling;
2060
a0d0e21e 2061 return fold_constants((OP *)binop);
79072805
LW		 2062}
2063
2064OP *
8ac85365 2065pmtrans(OP *o, OP *expr, OP *repl)
79072805 2066{
79072805
LW		 2067 SV *tstr = ((SVOP*)expr)->op_sv;
2068 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2069 STRLEN tlen;
2070 STRLEN rlen;
ec49126f 2071 register U8 *t = (U8*)SvPV(tstr, tlen);
2072 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 2073 register I32 i;
2074 register I32 j;
8ac85365 2075 I32 Delete;
79072805 2076 I32 complement;
5d06d08e 2077 I32 squash;
79072805
LW		 2078 register short *tbl;
2079
11343788
MB		 2080 tbl = (short*)cPVOPo->op_pv;
2081 complement = o->op_private & OPpTRANS_COMPLEMENT;
8ac85365 2082 Delete = o->op_private & OPpTRANS_DELETE;
5d06d08e 2083 squash = o->op_private & OPpTRANS_SQUASH;
79072805
LW		 2084
2085 if (complement) {
2086 Zero(tbl, 256, short);
2087 for (i = 0; i < tlen; i++)
ec49126f 2088 tbl[t[i]] = -1;
79072805
LW		 2089 for (i = 0, j = 0; i < 256; i++) {
2090 if (!tbl[i]) {
2091 if (j >= rlen) {
8ac85365 2092 if (Delete)
79072805
LW		 2093 tbl[i] = -2;
2094 else if (rlen)
ec49126f 2095 tbl[i] = r[j-1];
79072805
LW		 2096 else
2097 tbl[i] = i;
2098 }
2099 else
ec49126f 2100 tbl[i] = r[j++];
79072805
LW		 2101 }
2102 }
2103 }
2104 else {
8ac85365 2105 if (!rlen && !Delete) {
79072805 2106 r = t; rlen = tlen;
5d06d08e
MB		 2107 if (!squash)
2108 o->op_private |= OPpTRANS_COUNTONLY;
79072805
LW		 2109 }
2110 for (i = 0; i < 256; i++)
2111 tbl[i] = -1;
2112 for (i = 0, j = 0; i < tlen; i++,j++) {
2113 if (j >= rlen) {
8ac85365 2114 if (Delete) {
ec49126f 2115 if (tbl[t[i]] == -1)
2116 tbl[t[i]] = -2;
79072805
LW		 2117 continue;
2118 }
2119 --j;
2120 }
ec49126f 2121 if (tbl[t[i]] == -1)
2122 tbl[t[i]] = r[j];
79072805
LW		 2123 }
2124 }
2125 op_free(expr);
2126 op_free(repl);
2127
11343788 2128 return o;
79072805
LW		 2129}
2130
2131OP *
8ac85365 2132newPMOP(I32 type, I32 flags)
79072805 2133{
11343788 2134 dTHR;
79072805
LW		 2135 PMOP *pmop;
2136
2137 Newz(1101, pmop, 1, PMOP);
2138 pmop->op_type = type;
2139 pmop->op_ppaddr = ppaddr[type];
2140 pmop->op_flags = flags;
c07a80fd 2141 pmop->op_private = 0 | (flags >> 8);
79072805 2142
3280af22 2143 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 2144 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 2145 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 2146 pmop->op_pmpermflags |= PMf_LOCALE;
2147 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2148
79072805 2149 /* link into pm list */
3280af22
NIS		 2150 if (type != OP_TRANS && PL_curstash) {
2151 pmop->op_pmnext = HvPMROOT(PL_curstash);
2152 HvPMROOT(PL_curstash) = pmop;
79072805
LW		 2153 }
2154
2155 return (OP*)pmop;
2156}
2157
2158OP *
8ac85365 2159pmruntime(OP *o, OP *expr, OP *repl)
79072805 2160{
5c0ca799 2161 dTHR;
79072805
LW		 2162 PMOP *pm;
2163 LOGOP *rcop;
ce862d02 2164 I32 repl_has_vars = 0;
79072805 2165
11343788
MB		 2166 if (o->op_type == OP_TRANS)
2167 return pmtrans(o, expr, repl);
79072805 2168
3280af22 2169 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2170 pm = (PMOP*)o;
79072805
LW		 2171
2172 if (expr->op_type == OP_CONST) {
463ee0b2 2173 STRLEN plen;
79072805 2174 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2175 char *p = SvPV(pat, plen);
11343788 2176 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2177 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2178 p = SvPV(pat, plen);
79072805
LW		 2179 pm->op_pmflags |= PMf_SKIPWHITE;
2180 }
15e52e56 2181 pm->op_pmregexp = CALLREGCOMP(p, p + plen, pm);
aeea060c 2182 if (strEQ("\\s+", pm->op_pmregexp->precomp))
85e6fe83 2183 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2184 op_free(expr);
2185 }
2186 else {
3280af22
NIS		 2187 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
2188 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2189 ? OP_REGCRESET
2190 : OP_REGCMAYBE),0,expr);
463ee0b2 2191
79072805
LW		 2192 Newz(1101, rcop, 1, LOGOP);
2193 rcop->op_type = OP_REGCOMP;
2194 rcop->op_ppaddr = ppaddr[OP_REGCOMP];
2195 rcop->op_first = scalar(expr);
3280af22 2196 rcop->op_flags |= ((PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2197 ? (OPf_SPECIAL | OPf_KIDS)
2198 : OPf_KIDS);
79072805 2199 rcop->op_private = 1;
11343788 2200 rcop->op_other = o;
79072805
LW		 2201
2202 /* establish postfix order */
3280af22 2203 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2204 LINKLIST(expr);
2205 rcop->op_next = expr;
2206 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2207 }
2208 else {
2209 rcop->op_next = LINKLIST(expr);
2210 expr->op_next = (OP*)rcop;
2211 }
79072805 2212
11343788 2213 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2214 }
2215
2216 if (repl) {
748a9306
LW		 2217 OP *curop;
2218 if (pm->op_pmflags & PMf_EVAL)
2219 curop = 0;
554b3eca 2220#ifdef USE_THREADS
2faa37cc 2221 else if (repl->op_type == OP_THREADSV
554b3eca 2222 && strchr("&`'123456789+",
533c011a 2223 PL_threadsv_names[repl->op_targ]))
554b3eca
MB		 2224 {
2225 curop = 0;
2226 }
2227#endif /* USE_THREADS */
748a9306
LW		 2228 else if (repl->op_type == OP_CONST)
2229 curop = repl;
79072805 2230 else {
79072805
LW		 2231 OP *lastop = 0;
2232 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
2233 if (opargs[curop->op_type] & OA_DANGEROUS) {
554b3eca 2234#ifdef USE_THREADS
ce862d02
IZ		 2235 if (curop->op_type == OP_THREADSV) {
2236 repl_has_vars = 1;
be949f6f 2237 if (strchr("&`'123456789+", curop->op_private))
ce862d02 2238 break;
554b3eca
MB		 2239 }
2240#else
79072805
LW		 2241 if (curop->op_type == OP_GV) {
2242 GV *gv = ((GVOP*)curop)->op_gv;
ce862d02 2243 repl_has_vars = 1;
93a17b20 2244 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 2245 break;
2246 }
554b3eca 2247#endif /* USE_THREADS */
79072805
LW		 2248 else if (curop->op_type == OP_RV2CV)
2249 break;
2250 else if (curop->op_type == OP_RV2SV ||
2251 curop->op_type == OP_RV2AV ||
2252 curop->op_type == OP_RV2HV ||
2253 curop->op_type == OP_RV2GV) {
2254 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2255 break;
2256 }
748a9306
LW		 2257 else if (curop->op_type == OP_PADSV ||
2258 curop->op_type == OP_PADAV ||
2259 curop->op_type == OP_PADHV ||
554b3eca 2260 curop->op_type == OP_PADANY) {
ce862d02 2261 repl_has_vars = 1;
748a9306 2262 }
1167e5da
SM		 2263 else if (curop->op_type == OP_PUSHRE)
2264 ; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 2265 else
2266 break;
2267 }
2268 lastop = curop;
2269 }
748a9306 2270 }
ce862d02
IZ		 2271 if (curop == repl
2272 && !(repl_has_vars
2273 && (!pm->op_pmregexp
2274 || pm->op_pmregexp->reganch & ROPT_EVAL_SEEN))) {
748a9306 2275 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2276 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2277 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2278 }
2279 else {
ce862d02
IZ		 2280 if (curop == repl && !pm->op_pmregexp) { /* Has variables. */
2281 pm->op_pmflags |= PMf_MAYBE_CONST;
2282 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2283 }
748a9306
LW		 2284 Newz(1101, rcop, 1, LOGOP);
2285 rcop->op_type = OP_SUBSTCONT;
2286 rcop->op_ppaddr = ppaddr[OP_SUBSTCONT];
2287 rcop->op_first = scalar(repl);
2288 rcop->op_flags |= OPf_KIDS;
2289 rcop->op_private = 1;
11343788 2290 rcop->op_other = o;
748a9306
LW		 2291
2292 /* establish postfix order */
2293 rcop->op_next = LINKLIST(repl);
2294 repl->op_next = (OP*)rcop;
2295
2296 pm->op_pmreplroot = scalar((OP*)rcop);
2297 pm->op_pmreplstart = LINKLIST(rcop);
2298 rcop->op_next = 0;
79072805
LW		 2299 }
2300 }
2301
2302 return (OP*)pm;
2303}
2304
2305OP *
8ac85365 2306newSVOP(I32 type, I32 flags, SV *sv)
79072805
LW		 2307{
2308 SVOP *svop;
2309 Newz(1101, svop, 1, SVOP);
2310 svop->op_type = type;
2311 svop->op_ppaddr = ppaddr[type];
2312 svop->op_sv = sv;
2313 svop->op_next = (OP*)svop;
2314 svop->op_flags = flags;
2315 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2316 scalar((OP*)svop);
79072805 2317 if (opargs[type] & OA_TARGET)
ed6116ce 2318 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2319 return CHECKOP(type, svop);
79072805
LW		 2320}
2321
2322OP *
8ac85365 2323newGVOP(I32 type, I32 flags, GV *gv)
79072805 2324{
11343788 2325 dTHR;
79072805
LW		 2326 GVOP *gvop;
2327 Newz(1101, gvop, 1, GVOP);
2328 gvop->op_type = type;
2329 gvop->op_ppaddr = ppaddr[type];
8990e307 2330 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2331 gvop->op_next = (OP*)gvop;
2332 gvop->op_flags = flags;
2333 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2334 scalar((OP*)gvop);
79072805 2335 if (opargs[type] & OA_TARGET)
ed6116ce 2336 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2337 return CHECKOP(type, gvop);
79072805
LW		 2338}
2339
2340OP *
8ac85365 2341newPVOP(I32 type, I32 flags, char *pv)
79072805
LW		 2342{
2343 PVOP *pvop;
2344 Newz(1101, pvop, 1, PVOP);
2345 pvop->op_type = type;
2346 pvop->op_ppaddr = ppaddr[type];
2347 pvop->op_pv = pv;
2348 pvop->op_next = (OP*)pvop;
2349 pvop->op_flags = flags;
2350 if (opargs[type] & OA_RETSCALAR)
463ee0b2 2351 scalar((OP*)pvop);
79072805 2352 if (opargs[type] & OA_TARGET)
ed6116ce 2353 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2354 return CHECKOP(type, pvop);
79072805
LW		 2355}
2356
79072805 2357void
8ac85365 2358package(OP *o)
79072805 2359{
11343788 2360 dTHR;
93a17b20 2361 SV *sv;
79072805 2362
3280af22
NIS		 2363 save_hptr(&PL_curstash);
2364 save_item(PL_curstname);
11343788 2365 if (o) {
463ee0b2
LW		 2366 STRLEN len;
2367 char *name;
11343788 2368 sv = cSVOPo->op_sv;
463ee0b2 2369 name = SvPV(sv, len);
3280af22
NIS		 2370 PL_curstash = gv_stashpvn(name,len,TRUE);
2371 sv_setpvn(PL_curstname, name, len);
11343788 2372 op_free(o);
93a17b20
LW		 2373 }
2374 else {
3280af22
NIS		 2375 sv_setpv(PL_curstname,"<none>");
2376 PL_curstash = Nullhv;
93a17b20 2377 }
0a42b372 2378 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 2379 PL_copline = NOLINE;
2380 PL_expect = XSTATE;
79072805
LW		 2381}
2382
85e6fe83 2383void
8ac85365 2384utilize(int aver, I32 floor, OP *version, OP *id, OP *arg)
85e6fe83 2385{
a0d0e21e
LW		 2386 OP *pack;
2387 OP *meth;
2388 OP *rqop;
2389 OP *imop;
b1cb66bf 2390 OP *veop;
85e6fe83 2391
a0d0e21e
LW		 2392 if (id->op_type != OP_CONST)
2393 croak("Module name must be constant");
85e6fe83 2394
b1cb66bf 2395 veop = Nullop;
2396
2397 if(version != Nullop) {
2398 SV *vesv = ((SVOP*)version)->op_sv;
2399
2400 if (arg == Nullop && !SvNIOK(vesv)) {
2401 arg = version;
2402 }
2403 else {
2404 OP *pack;
2405 OP *meth;
2406
2407 if (version->op_type != OP_CONST || !SvNIOK(vesv))
2408 croak("Version number must be constant number");
2409
2410 /* Make copy of id so we don't free it twice */
2411 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2412
2413 /* Fake up a method call to VERSION */
2414 meth = newSVOP(OP_CONST, 0, newSVpv("VERSION", 7));
2415 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2416 append_elem(OP_LIST,
2417 prepend_elem(OP_LIST, pack, list(version)),
2418 newUNOP(OP_METHOD, 0, meth)));
2419 }
2420 }
aeea060c 2421
a0d0e21e 2422 /* Fake up an import/unimport */
4633a7c4
LW		 2423 if (arg && arg->op_type == OP_STUB)
2424 imop = arg; /* no import on explicit () */
b1cb66bf 2425 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2426 imop = Nullop; /* use 5.0; */
2427 }
4633a7c4
LW		 2428 else {
2429 /* Make copy of id so we don't free it twice */
2430 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4
LW		 2431 meth = newSVOP(OP_CONST, 0,
2432 aver
2433 ? newSVpv("import", 6)
2434 : newSVpv("unimport", 8)
2435 );
2436 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2437 append_elem(OP_LIST,
2438 prepend_elem(OP_LIST, pack, list(arg)),
2439 newUNOP(OP_METHOD, 0, meth)));
4633a7c4
LW		 2440 }
2441
2442 /* Fake up a require */
2443 rqop = newUNOP(OP_REQUIRE, 0, id);
a0d0e21e
LW		 2444
2445 /* Fake up the BEGIN {}, which does its thing immediately. */
c07a80fd 2446 newSUB(floor,
a0d0e21e 2447 newSVOP(OP_CONST, 0, newSVpv("BEGIN", 5)),
4633a7c4 2448 Nullop,
a0d0e21e 2449 append_elem(OP_LINESEQ,
b1cb66bf 2450 append_elem(OP_LINESEQ,
2451 newSTATEOP(0, Nullch, rqop),
2452 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2453 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2454
3280af22
NIS		 2455 PL_copline = NOLINE;
2456 PL_expect = XSTATE;
85e6fe83
LW		 2457}
2458
79072805 2459OP *
8ac85365 2460newSLICEOP(I32 flags, OP *subscript, OP *listval)
79072805
LW		 2461{
2462 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 2463 list(force_list(subscript)),
2464 list(force_list(listval)) );
79072805
LW		 2465}
2466
76e3520e 2467STATIC I32
8ac85365 2468list_assignment(register OP *o)
79072805 2469{
11343788 2470 if (!o)
79072805
LW		 2471 return TRUE;
2472
11343788
MB		 2473 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
2474 o = cUNOPo->op_first;
79072805 2475
11343788
MB		 2476 if (o->op_type == OP_COND_EXPR) {
2477 I32 t = list_assignment(cCONDOPo->op_first->op_sibling);
2478 I32 f = list_assignment(cCONDOPo->op_first->op_sibling->op_sibling);
79072805
LW		 2479
2480 if (t && f)
2481 return TRUE;
2482 if (t || f)
2483 yyerror("Assignment to both a list and a scalar");
2484 return FALSE;
2485 }
2486
11343788
MB		 2487 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
2488 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
2489 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 2490 return TRUE;
2491
11343788 2492 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 2493 return TRUE;
2494
11343788 2495 if (o->op_type == OP_RV2SV)
79072805
LW		 2496 return FALSE;
2497
2498 return FALSE;
2499}
2500
2501OP *
8ac85365 2502newASSIGNOP(I32 flags, OP *left, I32 optype, OP *right)
79072805 2503{
11343788 2504 OP *o;
79072805 2505
a0d0e21e
LW		 2506 if (optype) {
2507 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
2508 return newLOGOP(optype, 0,
2509 mod(scalar(left), optype),
2510 newUNOP(OP_SASSIGN, 0, scalar(right)));
2511 }
2512 else {
2513 return newBINOP(optype, OPf_STACKED,
2514 mod(scalar(left), optype), scalar(right));
2515 }
2516 }
2517
79072805 2518 if (list_assignment(left)) {
6ee623d5 2519 dTHR;
3280af22
NIS		 2520 PL_modcount = 0;
2521 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 2522 left = mod(left, OP_AASSIGN);
3280af22
NIS		 2523 if (PL_eval_start)
2524 PL_eval_start = 0;
748a9306 2525 else {
a0d0e21e
LW		 2526 op_free(left);
2527 op_free(right);
2528 return Nullop;
2529 }
11343788 2530 o = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 2531 list(force_list(right)),
2532 list(force_list(left)) );
11343788 2533 o->op_private = 0 | (flags >> 8);
a0d0e21e 2534 if (!(left->op_private & OPpLVAL_INTRO)) {
79072805 2535 OP *curop;
11343788 2536 OP *lastop = o;
3280af22 2537 PL_generation++;
11343788 2538 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
79072805
LW		 2539 if (opargs[curop->op_type] & OA_DANGEROUS) {
2540 if (curop->op_type == OP_GV) {
2541 GV *gv = ((GVOP*)curop)->op_gv;
3280af22 2542 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
79072805 2543 break;
3280af22 2544 SvCUR(gv) = PL_generation;
79072805 2545 }
748a9306
LW		 2546 else if (curop->op_type == OP_PADSV ||
2547 curop->op_type == OP_PADAV ||
2548 curop->op_type == OP_PADHV ||
2549 curop->op_type == OP_PADANY) {
3280af22 2550 SV **svp = AvARRAY(PL_comppad_name);
8e07c86e 2551 SV *sv = svp[curop->op_targ];
3280af22 2552 if (SvCUR(sv) == PL_generation)
748a9306 2553 break;
3280af22 2554 SvCUR(sv) = PL_generation; /* (SvCUR not used any more) */
748a9306 2555 }
79072805
LW		 2556 else if (curop->op_type == OP_RV2CV)
2557 break;
2558 else if (curop->op_type == OP_RV2SV ||
2559 curop->op_type == OP_RV2AV ||
2560 curop->op_type == OP_RV2HV ||
2561 curop->op_type == OP_RV2GV) {
2562 if (lastop->op_type != OP_GV) /* funny deref? */
2563 break;
2564 }
1167e5da
SM		 2565 else if (curop->op_type == OP_PUSHRE) {
2566 if (((PMOP*)curop)->op_pmreplroot) {
2567 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
3280af22 2568 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
1167e5da 2569 break;
3280af22 2570 SvCUR(gv) = PL_generation;
1167e5da
SM		 2571 }
2572 }
79072805
LW		 2573 else
2574 break;
2575 }
2576 lastop = curop;
2577 }
11343788
MB		 2578 if (curop != o)
2579 o->op_private = OPpASSIGN_COMMON;
79072805 2580 }
c07a80fd 2581 if (right && right->op_type == OP_SPLIT) {
2582 OP* tmpop;
2583 if ((tmpop = ((LISTOP*)right)->op_first) &&
2584 tmpop->op_type == OP_PUSHRE)
2585 {
2586 PMOP *pm = (PMOP*)tmpop;
2587 if (left->op_type == OP_RV2AV &&
2588 !(left->op_private & OPpLVAL_INTRO) &&
11343788 2589 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 2590 {
2591 tmpop = ((UNOP*)left)->op_first;
2592 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
2593 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
2594 pm->op_pmflags |= PMf_ONCE;
11343788 2595 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 2596 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
2597 tmpop->op_sibling = Nullop; /* don't free split */
2598 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 2599 op_free(o); /* blow off assign */
54310121 2600 right->op_flags &= ~OPf_WANT;
a5f75d66 2601 /* "I don't know and I don't care." */
c07a80fd 2602 return right;
2603 }
2604 }
2605 else {
3280af22 2606 if (PL_modcount < 10000 &&
c07a80fd 2607 ((LISTOP*)right)->op_last->op_type == OP_CONST)
2608 {
2609 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
2610 if (SvIVX(sv) == 0)
3280af22 2611 sv_setiv(sv, PL_modcount+1);
c07a80fd 2612 }
2613 }
2614 }
2615 }
11343788 2616 return o;
79072805
LW		 2617 }
2618 if (!right)
2619 right = newOP(OP_UNDEF, 0);
2620 if (right->op_type == OP_READLINE) {
2621 right->op_flags |= OPf_STACKED;
463ee0b2 2622 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 2623 }
a0d0e21e 2624 else {
3280af22 2625 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 2626 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 2627 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 2628 if (PL_eval_start)
2629 PL_eval_start = 0;
748a9306 2630 else {
11343788 2631 op_free(o);
a0d0e21e
LW		 2632 return Nullop;
2633 }
2634 }
11343788 2635 return o;
79072805
LW		 2636}
2637
2638OP *
8ac85365 2639newSTATEOP(I32 flags, char *label, OP *o)
79072805 2640{
11343788 2641 dTHR;
bbce6d69 2642 U32 seq = intro_my();
79072805
LW		 2643 register COP *cop;
2644
2645 Newz(1101, cop, 1, COP);
3280af22 2646 if (PERLDB_LINE && PL_curcop->cop_line && PL_curstash != PL_debstash) {
8990e307
LW		 2647 cop->op_type = OP_DBSTATE;
2648 cop->op_ppaddr = ppaddr[ OP_DBSTATE ];
2649 }
2650 else {
2651 cop->op_type = OP_NEXTSTATE;
2652 cop->op_ppaddr = ppaddr[ OP_NEXTSTATE ];
2653 }
79072805 2654 cop->op_flags = flags;
c07a80fd 2655 cop->op_private = 0 | (flags >> 8);
ff0cee69 2656#ifdef NATIVE_HINTS
2657 cop->op_private |= NATIVE_HINTS;
2658#endif
79072805
LW		 2659 cop->op_next = (OP*)cop;
2660
463ee0b2
LW		 2661 if (label) {
2662 cop->cop_label = label;
3280af22 2663 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 2664 }
bbce6d69 2665 cop->cop_seq = seq;
3280af22 2666 cop->cop_arybase = PL_curcop->cop_arybase;
79072805 2667
3280af22
NIS		 2668 if (PL_copline == NOLINE)
2669 cop->cop_line = PL_curcop->cop_line;
79072805 2670 else {
3280af22
NIS		 2671 cop->cop_line = PL_copline;
2672 PL_copline = NOLINE;
79072805 2673 }
3280af22
NIS		 2674 cop->cop_filegv = (GV*)SvREFCNT_inc(PL_curcop->cop_filegv);
2675 cop->cop_stash = PL_curstash;
79072805 2676
3280af22
NIS		 2677 if (PERLDB_LINE && PL_curstash != PL_debstash) {
2678 SV **svp = av_fetch(GvAV(PL_curcop->cop_filegv),(I32)cop->cop_line, FALSE);
2679 if (svp && *svp != &PL_sv_undef && !SvIOK(*svp)) {
a0d0e21e 2680 (void)SvIOK_on(*svp);
a5f75d66 2681 SvIVX(*svp) = 1;
93a17b20
LW		 2682 SvSTASH(*svp) = (HV*)cop;
2683 }
2684 }
2685
11343788 2686 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 2687}
2688
bbce6d69 2689/* "Introduce" my variables to visible status. */
2690U32
8ac85365 2691intro_my(void)
bbce6d69 2692{
2693 SV **svp;
2694 SV *sv;
2695 I32 i;
2696
3280af22
NIS		 2697 if (! PL_min_intro_pending)
2698 return PL_cop_seqmax;
bbce6d69 2699
3280af22
NIS		 2700 svp = AvARRAY(PL_comppad_name);
2701 for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
2702 if ((sv = svp[i]) && sv != &PL_sv_undef && !SvIVX(sv)) {
0eba9742 2703 SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */
3280af22 2704 SvNVX(sv) = (double)PL_cop_seqmax;
bbce6d69 2705 }
2706 }
3280af22
NIS		 2707 PL_min_intro_pending = 0;
2708 PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
2709 return PL_cop_seqmax++;
bbce6d69 2710}
2711
79072805 2712OP *
8ac85365 2713newLOGOP(I32 type, I32 flags, OP *first, OP *other)
79072805 2714{
883ffac3
CS		 2715 return new_logop(type, flags, &first, &other);
2716}
2717
3bd495df 2718STATIC OP *
883ffac3
CS		 2719new_logop(I32 type, I32 flags, OP** firstp, OP** otherp)
2720{
11343788 2721 dTHR;
79072805 2722 LOGOP *logop;
11343788 2723 OP *o;
883ffac3
CS		 2724 OP *first = *firstp;
2725 OP *other = *otherp;
79072805 2726
a0d0e21e
LW		 2727 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
2728 return newBINOP(type, flags, scalar(first), scalar(other));
2729
8990e307 2730 scalarboolean(first);
79072805
LW		 2731 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
2732 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
2733 if (type == OP_AND || type == OP_OR) {
2734 if (type == OP_AND)
2735 type = OP_OR;
2736 else
2737 type = OP_AND;
11343788 2738 o = first;
883ffac3 2739 first = *firstp = cUNOPo->op_first;
11343788
MB		 2740 if (o->op_next)
2741 first->op_next = o->op_next;
2742 cUNOPo->op_first = Nullop;
2743 op_free(o);
79072805
LW		 2744 }
2745 }
2746 if (first->op_type == OP_CONST) {
3280af22 2747 if (PL_dowarn && (first->op_private & OPpCONST_BARE))
c07a80fd 2748 warn("Probable precedence problem on %s", op_desc[type]);
79072805
LW		 2749 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
2750 op_free(first);
883ffac3 2751 *firstp = Nullop;
79072805
LW		 2752 return other;
2753 }
2754 else {
2755 op_free(other);
883ffac3 2756 *otherp = Nullop;
79072805
LW		 2757 return first;
2758 }
2759 }
2760 else if (first->op_type == OP_WANTARRAY) {
2761 if (type == OP_AND)
2762 list(other);
2763 else
2764 scalar(other);
2765 }
3280af22 2766 else if (PL_dowarn && (first->op_flags & OPf_KIDS)) {
a6006777 2767 OP *k1 = ((UNOP*)first)->op_first;
2768 OP *k2 = k1->op_sibling;
2769 OPCODE warnop = 0;
2770 switch (first->op_type)
2771 {
2772 case OP_NULL:
2773 if (k2 && k2->op_type == OP_READLINE
2774 && (k2->op_flags & OPf_STACKED)
55d729e4 2775 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
a6006777 2776 warnop = k2->op_type;
2777 break;
2778
2779 case OP_SASSIGN:
68dc0745 2780 if (k1->op_type == OP_READDIR
2781 || k1->op_type == OP_GLOB
2782 || k1->op_type == OP_EACH)
a6006777 2783 warnop = k1->op_type;
2784 break;
2785 }
8ebc5c01 2786 if (warnop) {
3280af22
NIS		 2787 line_t oldline = PL_curcop->cop_line;
2788 PL_curcop->cop_line = PL_copline;
68dc0745 2789 warn("Value of %s%s can be \"0\"; test with defined()",
2790 op_desc[warnop],
2791 ((warnop == OP_READLINE || warnop == OP_GLOB)
2792 ? " construct" : "() operator"));
3280af22 2793 PL_curcop->cop_line = oldline;
8ebc5c01 2794 }
a6006777 2795 }
79072805
LW		 2796
2797 if (!other)
2798 return first;
2799
a0d0e21e
LW		 2800 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
2801 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
2802
79072805
LW		 2803 Newz(1101, logop, 1, LOGOP);
2804
2805 logop->op_type = type;
2806 logop->op_ppaddr = ppaddr[type];
2807 logop->op_first = first;
2808 logop->op_flags = flags | OPf_KIDS;
2809 logop->op_other = LINKLIST(other);
c07a80fd 2810 logop->op_private = 1 | (flags >> 8);
79072805
LW		 2811
2812 /* establish postfix order */
2813 logop->op_next = LINKLIST(first);
2814 first->op_next = (OP*)logop;
2815 first->op_sibling = other;
2816
11343788
MB		 2817 o = newUNOP(OP_NULL, 0, (OP*)logop);
2818 other->op_next = o;
79072805 2819
11343788 2820 return o;
79072805
LW		 2821}
2822
2823OP *
8ac85365 2824newCONDOP(I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 2825{
11343788 2826 dTHR;
79072805 2827 CONDOP *condop;
11343788 2828 OP *o;
79072805 2829
b1cb66bf 2830 if (!falseop)
2831 return newLOGOP(OP_AND, 0, first, trueop);
2832 if (!trueop)
2833 return newLOGOP(OP_OR, 0, first, falseop);
79072805 2834
8990e307 2835 scalarboolean(first);
79072805
LW		 2836 if (first->op_type == OP_CONST) {
2837 if (SvTRUE(((SVOP*)first)->op_sv)) {
2838 op_free(first);
b1cb66bf 2839 op_free(falseop);
2840 return trueop;
79072805
LW		 2841 }
2842 else {
2843 op_free(first);
b1cb66bf 2844 op_free(trueop);
2845 return falseop;
79072805
LW		 2846 }
2847 }
2848 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 2849 list(trueop);
2850 scalar(falseop);
79072805
LW		 2851 }
2852 Newz(1101, condop, 1, CONDOP);
2853
2854 condop->op_type = OP_COND_EXPR;
2855 condop->op_ppaddr = ppaddr[OP_COND_EXPR];
2856 condop->op_first = first;
2857 condop->op_flags = flags | OPf_KIDS;
b1cb66bf 2858 condop->op_true = LINKLIST(trueop);
2859 condop->op_false = LINKLIST(falseop);
c07a80fd 2860 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2861
2862 /* establish postfix order */
2863 condop->op_next = LINKLIST(first);
2864 first->op_next = (OP*)condop;
2865
b1cb66bf 2866 first->op_sibling = trueop;
2867 trueop->op_sibling = falseop;
11343788 2868 o = newUNOP(OP_NULL, 0, (OP*)condop);
79072805 2869
5dc0d613
MB		 2870 trueop->op_next = o;
2871 falseop->op_next = o;
79072805 2872
11343788 2873 return o;
79072805
LW		 2874}
2875
2876OP *
8ac85365 2877newRANGE(I32 flags, OP *left, OP *right)
79072805 2878{
b35b2403 2879 dTHR;
79072805
LW		 2880 CONDOP *condop;
2881 OP *flip;
2882 OP *flop;
11343788 2883 OP *o;
79072805
LW		 2884
2885 Newz(1101, condop, 1, CONDOP);
2886
2887 condop->op_type = OP_RANGE;
2888 condop->op_ppaddr = ppaddr[OP_RANGE];
2889 condop->op_first = left;
2890 condop->op_flags = OPf_KIDS;
2891 condop->op_true = LINKLIST(left);
2892 condop->op_false = LINKLIST(right);
c07a80fd 2893 condop->op_private = 1 | (flags >> 8);
79072805
LW		 2894
2895 left->op_sibling = right;
2896
2897 condop->op_next = (OP*)condop;
2898 flip = newUNOP(OP_FLIP, flags, (OP*)condop);
2899 flop = newUNOP(OP_FLOP, 0, flip);
11343788 2900 o = newUNOP(OP_NULL, 0, flop);
79072805
LW		 2901 linklist(flop);
2902
2903 left->op_next = flip;
2904 right->op_next = flop;
2905
ed6116ce 2906 condop->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805 2907 sv_upgrade(PAD_SV(condop->op_targ), SVt_PVNV);
ed6116ce 2908 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 2909 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
2910
2911 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2912 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
2913
11343788 2914 flip->op_next = o;
79072805 2915 if (!flip->op_private || !flop->op_private)
11343788 2916 linklist(o); /* blow off optimizer unless constant */
79072805 2917
11343788 2918 return o;
79072805
LW		 2919}
2920
2921OP *
8ac85365 2922newLOOPOP(I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 2923{
11343788 2924 dTHR;
463ee0b2 2925 OP* listop;
11343788 2926 OP* o;
463ee0b2 2927 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 2928 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 2929
463ee0b2
LW		 2930 if (expr) {
2931 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
2932 return block; /* do {} while 0 does once */
fb73857a 2933 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
2934 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 2935 expr = newUNOP(OP_DEFINED, 0,
54b9620d 2936 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 2937 } else if (expr->op_flags & OPf_KIDS) {
2938 OP *k1 = ((UNOP*)expr)->op_first;
2939 OP *k2 = (k1) ? k1->op_sibling : NULL;
2940 switch (expr->op_type) {
2941 case OP_NULL:
2942 if (k2 && k2->op_type == OP_READLINE
2943 && (k2->op_flags & OPf_STACKED)
2944 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
2945 expr = newUNOP(OP_DEFINED, 0, expr);
2946 break;
2947
2948 case OP_SASSIGN:
2949 if (k1->op_type == OP_READDIR
2950 || k1->op_type == OP_GLOB
2951 || k1->op_type == OP_EACH)
2952 expr = newUNOP(OP_DEFINED, 0, expr);
2953 break;
2954 }
774d564b 2955 }
463ee0b2 2956 }
93a17b20 2957
8990e307 2958 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 2959 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 2960
883ffac3
CS		 2961 if (listop)
2962 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 2963
11343788
MB		 2964 if (once && o != listop)
2965 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 2966
11343788
MB		 2967 if (o == listop)
2968 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 2969
11343788
MB		 2970 o->op_flags |= flags;
2971 o = scope(o);
2972 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
2973 return o;
79072805
LW		 2974}
2975
2976OP *
8ac85365 2977newWHILEOP(I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805 2978{
11343788 2979 dTHR;
79072805
LW		 2980 OP *redo;
2981 OP *next = 0;
2982 OP *listop;
11343788 2983 OP *o;
79072805
LW		 2984 OP *condop;
2985
fb73857a 2986 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
2987 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 2988 expr = newUNOP(OP_DEFINED, 0,
54b9620d 2989 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 2990 } else if (expr && (expr->op_flags & OPf_KIDS)) {
2991 OP *k1 = ((UNOP*)expr)->op_first;
2992 OP *k2 = (k1) ? k1->op_sibling : NULL;
2993 switch (expr->op_type) {
2994 case OP_NULL:
2995 if (k2 && k2->op_type == OP_READLINE
2996 && (k2->op_flags & OPf_STACKED)
2997 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
2998 expr = newUNOP(OP_DEFINED, 0, expr);
2999 break;
3000
3001 case OP_SASSIGN:
3002 if (k1->op_type == OP_READDIR
3003 || k1->op_type == OP_GLOB
3004 || k1->op_type == OP_EACH)
3005 expr = newUNOP(OP_DEFINED, 0, expr);
3006 break;
3007 }
748a9306 3008 }
79072805
LW		 3009
3010 if (!block)
3011 block = newOP(OP_NULL, 0);
3012
3013 if (cont)
3014 next = LINKLIST(cont);
fb73857a 3015 if (expr) {
79072805 3016 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
fb73857a 3017 if ((line_t)whileline != NOLINE) {
3280af22 3018 PL_copline = whileline;
fb73857a 3019 cont = append_elem(OP_LINESEQ, cont,
3020 newSTATEOP(0, Nullch, Nullop));
3021 }
3022 }
79072805 3023
463ee0b2 3024 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 3025 redo = LINKLIST(listop);
3026
3027 if (expr) {
3280af22 3028 PL_copline = whileline;
883ffac3
CS		 3029 scalar(listop);
3030 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 3031 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 3032 op_free(expr); /* oops, it's a while (0) */
463ee0b2 3033 op_free((OP*)loop);
883ffac3 3034 return Nullop; /* listop already freed by new_logop */
463ee0b2 3035 }
883ffac3
CS		 3036 if (listop)
3037 ((LISTOP*)listop)->op_last->op_next = condop =
3038 (o == listop ? redo : LINKLIST(o));
79072805
LW		 3039 if (!next)
3040 next = condop;
3041 }
3042 else
11343788 3043 o = listop;
79072805
LW		 3044
3045 if (!loop) {
3046 Newz(1101,loop,1,LOOP);
3047 loop->op_type = OP_ENTERLOOP;
3048 loop->op_ppaddr = ppaddr[OP_ENTERLOOP];
3049 loop->op_private = 0;
3050 loop->op_next = (OP*)loop;
3051 }
3052
11343788 3053 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 3054
3055 loop->op_redoop = redo;
11343788 3056 loop->op_lastop = o;
79072805
LW		 3057
3058 if (next)
3059 loop->op_nextop = next;
3060 else
11343788 3061 loop->op_nextop = o;
79072805 3062
11343788
MB		 3063 o->op_flags |= flags;
3064 o->op_private |= (flags >> 8);
3065 return o;
79072805
LW		 3066}
3067
3068OP *
8990e307 3069newFOROP(I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
79072805
LW		 3070{
3071 LOOP *loop;
fb73857a 3072 OP *wop;
85e6fe83 3073 int padoff = 0;
4633a7c4 3074 I32 iterflags = 0;
79072805 3075
79072805 3076 if (sv) {
85e6fe83 3077 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306
LW		 3078 sv->op_type = OP_RV2GV;
3079 sv->op_ppaddr = ppaddr[OP_RV2GV];
79072805 3080 }
85e6fe83
LW		 3081 else if (sv->op_type == OP_PADSV) { /* private variable */
3082 padoff = sv->op_targ;
3083 op_free(sv);
3084 sv = Nullop;
3085 }
54b9620d
MB		 3086 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
3087 padoff = sv->op_targ;
3088 iterflags |= OPf_SPECIAL;
3089 op_free(sv);
3090 sv = Nullop;
3091 }
79072805 3092 else
c07a80fd 3093 croak("Can't use %s for loop variable", op_desc[sv->op_type]);
79072805
LW		 3094 }
3095 else {
54b9620d
MB		 3096#ifdef USE_THREADS
3097 padoff = find_threadsv("_");
3098 iterflags |= OPf_SPECIAL;
3099#else
3280af22 3100 sv = newGVOP(OP_GV, 0, PL_defgv);
54b9620d 3101#endif
79072805 3102 }
5f05dabc 3103 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 3104 expr = mod(force_list(scalar(ref(expr, OP_ITER))), OP_GREPSTART);
4633a7c4
LW		 3105 iterflags |= OPf_STACKED;
3106 }
89ea2908
GA		 3107 else if (expr->op_type == OP_NULL &&
3108 (expr->op_flags & OPf_KIDS) &&
3109 ((BINOP*)expr)->op_first->op_type == OP_FLOP)
3110 {
3111 /* Basically turn for($x..$y) into the same as for($x,$y), but we
3112 * set the STACKED flag to indicate that these values are to be
3113 * treated as min/max values by 'pp_iterinit'.
3114 */
3115 UNOP* flip = (UNOP*)((UNOP*)((BINOP*)expr)->op_first)->op_first;
3116 CONDOP* range = (CONDOP*) flip->op_first;
3117 OP* left = range->op_first;
3118 OP* right = left->op_sibling;
5152d7c7 3119 LISTOP* listop;
89ea2908
GA		 3120
3121 range->op_flags &= ~OPf_KIDS;
3122 range->op_first = Nullop;
3123
5152d7c7
GS		 3124 listop = (LISTOP*)newLISTOP(OP_LIST, 0, left, right);
3125 listop->op_first->op_next = range->op_true;
89ea2908 3126 left->op_next = range->op_false;
5152d7c7
GS		 3127 right->op_next = (OP*)listop;
3128 listop->op_next = listop->op_first;
89ea2908
GA		 3129
3130 op_free(expr);
5152d7c7 3131 expr = (OP*)(listop);
89ea2908
GA		 3132 null(expr);
3133 iterflags |= OPf_STACKED;
3134 }
3135 else {
3136 expr = mod(force_list(expr), OP_GREPSTART);
3137 }
3138
3139
4633a7c4 3140 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
89ea2908 3141 append_elem(OP_LIST, expr, scalar(sv))));
85e6fe83
LW		 3142 assert(!loop->op_next);
3143 Renew(loop, 1, LOOP);
3144 loop->op_targ = padoff;
fb73857a 3145 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont);
3280af22 3146 PL_copline = forline;
fb73857a 3147 return newSTATEOP(0, label, wop);
79072805
LW		 3148}
3149
8990e307 3150OP*
8ac85365 3151newLOOPEX(I32 type, OP *label)
8990e307 3152{
11343788
MB		 3153 dTHR;
3154 OP *o;
8990e307 3155 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 3156 /* "last()" means "last" */
3157 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
3158 o = newOP(type, OPf_SPECIAL);
3159 else {
3160 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
3280af22 3161 ? SvPVx(((SVOP*)label)->op_sv, PL_na)
cdaebead
MB		 3162 : ""));
3163 }
8990e307
LW		 3164 op_free(label);
3165 }
3166 else {
a0d0e21e
LW		 3167 if (label->op_type == OP_ENTERSUB)
3168 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 3169 o = newUNOP(type, OPf_STACKED, label);
8990e307 3170 }
3280af22 3171 PL_hints |= HINT_BLOCK_SCOPE;
11343788 3172 return o;
8990e307
LW		 3173}
3174
79072805 3175void
8ac85365 3176cv_undef(CV *cv)
79072805 3177{
11343788
MB		 3178 dTHR;
3179#ifdef USE_THREADS
e858de61
MB		 3180 if (CvMUTEXP(cv)) {
3181 MUTEX_DESTROY(CvMUTEXP(cv));
3182 Safefree(CvMUTEXP(cv));
3183 CvMUTEXP(cv) = 0;
3184 }
11343788
MB		 3185#endif /* USE_THREADS */
3186
a0d0e21e 3187 if (!CvXSUB(cv) && CvROOT(cv)) {
11343788
MB		 3188#ifdef USE_THREADS
3189 if (CvDEPTH(cv) || (CvOWNER(cv) && CvOWNER(cv) != thr))
3190 croak("Can't undef active subroutine");
3191#else
a0d0e21e
LW		 3192 if (CvDEPTH(cv))
3193 croak("Can't undef active subroutine");
11343788 3194#endif /* USE_THREADS */
8990e307 3195 ENTER;
a0d0e21e 3196
3280af22
NIS		 3197 SAVESPTR(PL_curpad);
3198 PL_curpad = 0;
a0d0e21e 3199
a5f75d66 3200 if (!CvCLONED(cv))
748a9306 3201 op_free(CvROOT(cv));
79072805 3202 CvROOT(cv) = Nullop;
8990e307 3203 LEAVE;
79072805 3204 }
1d5db326 3205 SvPOK_off((SV*)cv); /* forget prototype */
44a8e56a 3206 CvFLAGS(cv) = 0;
8e07c86e
AD		 3207 SvREFCNT_dec(CvGV(cv));
3208 CvGV(cv) = Nullgv;
3209 SvREFCNT_dec(CvOUTSIDE(cv));
3210 CvOUTSIDE(cv) = Nullcv;
3211 if (CvPADLIST(cv)) {
8ebc5c01 3212 /* may be during global destruction */
3213 if (SvREFCNT(CvPADLIST(cv))) {
93965878 3214 I32 i = AvFILLp(CvPADLIST(cv));
8ebc5c01 3215 while (i >= 0) {
3216 SV** svp = av_fetch(CvPADLIST(cv), i--, FALSE);
46fc3d4c 3217 SV* sv = svp ? *svp : Nullsv;
3218 if (!sv)
3219 continue;
3280af22
NIS		 3220 if (sv == (SV*)PL_comppad_name)
3221 PL_comppad_name = Nullav;
3222 else if (sv == (SV*)PL_comppad) {
3223 PL_comppad = Nullav;
3224 PL_curpad = Null(SV**);
46fc3d4c 3225 }
3226 SvREFCNT_dec(sv);
8ebc5c01 3227 }
3228 SvREFCNT_dec((SV*)CvPADLIST(cv));
8e07c86e 3229 }
8e07c86e
AD		 3230 CvPADLIST(cv) = Nullav;
3231 }
79072805
LW		 3232}
3233
5f05dabc 3234#ifdef DEBUG_CLOSURES
76e3520e 3235STATIC void
5f05dabc 3236cv_dump(cv)
3237CV* cv;
3238{
3239 CV *outside = CvOUTSIDE(cv);
3240 AV* padlist = CvPADLIST(cv);
4fdae800 3241 AV* pad_name;
3242 AV* pad;
3243 SV** pname;
3244 SV** ppad;
5f05dabc 3245 I32 ix;
3246
fb73857a 3247 PerlIO_printf(Perl_debug_log, "\tCV=0x%lx (%s), OUTSIDE=0x%lx (%s)\n",
ab50184a
CS		 3248 cv,
3249 (CvANON(cv) ? "ANON"
6b88bc9c 3250 : (cv == PL_main_cv) ? "MAIN"
4e43f39e 3251 : CvUNIQUE(cv) ? "UNIQUE"
44a8e56a 3252 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
ab50184a
CS		 3253 outside,
3254 (!outside ? "null"
3255 : CvANON(outside) ? "ANON"
6b88bc9c 3256 : (outside == PL_main_cv) ? "MAIN"
07055b4c 3257 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3258 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
5f05dabc 3259
4fdae800 3260 if (!padlist)
3261 return;
3262
3263 pad_name = (AV*)*av_fetch(padlist, 0, FALSE);
3264 pad = (AV*)*av_fetch(padlist, 1, FALSE);
3265 pname = AvARRAY(pad_name);
3266 ppad = AvARRAY(pad);
3267
93965878 3268 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
5f05dabc 3269 if (SvPOK(pname[ix]))
fb73857a 3270 PerlIO_printf(Perl_debug_log, "\t%4d. 0x%lx (%s\"%s\" %ld-%ld)\n",
4fdae800 3271 ix, ppad[ix],
3272 SvFAKE(pname[ix]) ? "FAKE " : "",
3273 SvPVX(pname[ix]),
ab50184a
CS		 3274 (long)I_32(SvNVX(pname[ix])),
3275 (long)SvIVX(pname[ix]));
5f05dabc 3276 }
3277}
3278#endif /* DEBUG_CLOSURES */
3279
76e3520e 3280STATIC CV *
8ac85365 3281cv_clone2(CV *proto, CV *outside)
748a9306 3282{
11343788 3283 dTHR;
748a9306
LW		 3284 AV* av;
3285 I32 ix;
3286 AV* protopadlist = CvPADLIST(proto);
3287 AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
3288 AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
5f05dabc 3289 SV** pname = AvARRAY(protopad_name);
3290 SV** ppad = AvARRAY(protopad);
93965878
NIS		 3291 I32 fname = AvFILLp(protopad_name);
3292 I32 fpad = AvFILLp(protopad);
748a9306
LW		 3293 AV* comppadlist;
3294 CV* cv;
3295
07055b4c
CS		 3296 assert(!CvUNIQUE(proto));
3297
748a9306 3298 ENTER;
3280af22
NIS		 3299 SAVESPTR(PL_curpad);
3300 SAVESPTR(PL_comppad);
3301 SAVESPTR(PL_comppad_name);
3302 SAVESPTR(PL_compcv);
748a9306 3303
3280af22 3304 cv = PL_compcv = (CV*)NEWSV(1104,0);
fa83b5b6 3305 sv_upgrade((SV *)cv, SvTYPE(proto));
a5f75d66 3306 CvCLONED_on(cv);
5f05dabc 3307 if (CvANON(proto))
3308 CvANON_on(cv);
748a9306 3309
11343788 3310#ifdef USE_THREADS
12ca11f6 3311 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3312 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3313 CvOWNER(cv) = 0;
3314#endif /* USE_THREADS */
748a9306 3315 CvFILEGV(cv) = CvFILEGV(proto);
44a8e56a 3316 CvGV(cv) = (GV*)SvREFCNT_inc(CvGV(proto));
748a9306
LW		 3317 CvSTASH(cv) = CvSTASH(proto);
3318 CvROOT(cv) = CvROOT(proto);
3319 CvSTART(cv) = CvSTART(proto);
5f05dabc 3320 if (outside)
3321 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
748a9306 3322
68dc0745 3323 if (SvPOK(proto))
3324 sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto));
3325
3280af22 3326 PL_comppad_name = newAV();
46fc3d4c 3327 for (ix = fname; ix >= 0; ix--)
3280af22 3328 av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix]));
748a9306 3329
3280af22 3330 PL_comppad = newAV();
748a9306
LW		 3331
3332 comppadlist = newAV();
3333 AvREAL_off(comppadlist);
3280af22
NIS		 3334 av_store(comppadlist, 0, (SV*)PL_comppad_name);
3335 av_store(comppadlist, 1, (SV*)PL_comppad);
748a9306 3336 CvPADLIST(cv) = comppadlist;
3280af22
NIS		 3337 av_fill(PL_comppad, AvFILLp(protopad));
3338 PL_curpad = AvARRAY(PL_comppad);
748a9306
LW		 3339
3340 av = newAV(); /* will be @_ */
3341 av_extend(av, 0);
3280af22 3342 av_store(PL_comppad, 0, (SV*)av);
748a9306
LW		 3343 AvFLAGS(av) = AVf_REIFY;
3344
9607fc9c 3345 for (ix = fpad; ix > 0; ix--) {
3346 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
3280af22 3347 if (namesv && namesv != &PL_sv_undef) {
aa689395 3348 char *name = SvPVX(namesv); /* XXX */
3349 if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */
3350 I32 off = pad_findlex(name, ix, SvIVX(namesv),
a575ca2f 3351 CvOUTSIDE(cv), cxstack_ix, 0);
5f05dabc 3352 if (!off)
3280af22 3353 PL_curpad[ix] = SvREFCNT_inc(ppad[ix]);
5f05dabc 3354 else if (off != ix)
748a9306
LW		 3355 croak("panic: cv_clone: %s", name);
3356 }
3357 else { /* our own lexical */
aa689395 3358 SV* sv;
5f05dabc 3359 if (*name == '&') {
3360 /* anon code -- we'll come back for it */
3361 sv = SvREFCNT_inc(ppad[ix]);
3362 }
3363 else if (*name == '@')
3364 sv = (SV*)newAV();
748a9306 3365 else if (*name == '%')
5f05dabc 3366 sv = (SV*)newHV();
748a9306 3367 else
5f05dabc 3368 sv = NEWSV(0,0);
3369 if (!SvPADBUSY(sv))
3370 SvPADMY_on(sv);
3280af22 3371 PL_curpad[ix] = sv;
748a9306
LW		 3372 }
3373 }
3374 else {
aa689395 3375 SV* sv = NEWSV(0,0);
748a9306 3376 SvPADTMP_on(sv);
3280af22 3377 PL_curpad[ix] = sv;
748a9306
LW		 3378 }
3379 }
3380
5f05dabc 3381 /* Now that vars are all in place, clone nested closures. */
3382
9607fc9c 3383 for (ix = fpad; ix > 0; ix--) {
3384 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3385 if (namesv
3280af22 3386 && namesv != &PL_sv_undef
aa689395 3387 && !(SvFLAGS(namesv) & SVf_FAKE)
3388 && *SvPVX(namesv) == '&'
5f05dabc 3389 && CvCLONE(ppad[ix]))
3390 {
3391 CV *kid = cv_clone2((CV*)ppad[ix], cv);
3392 SvREFCNT_dec(ppad[ix]);
3393 CvCLONE_on(kid);
3394 SvPADMY_on(kid);
3280af22 3395 PL_curpad[ix] = (SV*)kid;
748a9306
LW		 3396 }
3397 }
3398
5f05dabc 3399#ifdef DEBUG_CLOSURES
ab50184a
CS		 3400 PerlIO_printf(Perl_debug_log, "Cloned inside:\n");
3401 cv_dump(outside);
3402 PerlIO_printf(Perl_debug_log, " from:\n");
5f05dabc 3403 cv_dump(proto);
ab50184a 3404 PerlIO_printf(Perl_debug_log, " to:\n");
5f05dabc 3405 cv_dump(cv);
3406#endif
3407
748a9306
LW		 3408 LEAVE;
3409 return cv;
3410}
3411
3412CV *
8ac85365 3413cv_clone(CV *proto)
5f05dabc 3414{
3415 return cv_clone2(proto, CvOUTSIDE(proto));
3416}
3417
3fe9a6f1 3418void
8ac85365 3419cv_ckproto(CV *cv, GV *gv, char *p)
3fe9a6f1 3420{
3421 if ((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX(cv)))) {
46fc3d4c 3422 SV* msg = sv_newmortal();
3fe9a6f1 3423 SV* name = Nullsv;
3424
3425 if (gv)
46fc3d4c 3426 gv_efullname3(name = sv_newmortal(), gv, Nullch);
3427 sv_setpv(msg, "Prototype mismatch:");
3428 if (name)
fc36a67e 3429 sv_catpvf(msg, " sub %_", name);
3fe9a6f1 3430 if (SvPOK(cv))
46fc3d4c 3431 sv_catpvf(msg, " (%s)", SvPVX(cv));
3432 sv_catpv(msg, " vs ");
3433 if (p)
3434 sv_catpvf(msg, "(%s)", p);
3435 else
3436 sv_catpv(msg, "none");
fc36a67e 3437 warn("%_", msg);
3fe9a6f1 3438 }
3439}
3440
760ac839 3441SV *
8ac85365 3442cv_const_sv(CV *cv)
760ac839 3443{
54310121 3444 if (!cv || !SvPOK(cv) || SvCUR(cv))
3445 return Nullsv;
fe5e78ed
GS		 3446 return op_const_sv(CvSTART(cv), cv);
3447}
760ac839 3448
fe5e78ed
GS		 3449SV *
3450op_const_sv(OP *o, CV *cv)
3451{
3452 SV *sv = Nullsv;
3453
3454 if(!o)
3455 return Nullsv;
3456
3457 if(o->op_type == OP_LINESEQ && cLISTOPo->op_first)
3458 o = cLISTOPo->op_first->op_sibling;
3459
3460 for (; o; o = o->op_next) {
54310121 3461 OPCODE type = o->op_type;
fe5e78ed
GS		 3462
3463 if(sv && o->op_next == o)
3464 return sv;
54310121 3465 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
3466 continue;
3467 if (type == OP_LEAVESUB || type == OP_RETURN)
3468 break;
3469 if (sv)
3470 return Nullsv;
3471 if (type == OP_CONST)
5dc0d613 3472 sv = cSVOPo->op_sv;
fe5e78ed 3473 else if (type == OP_PADSV && cv) {
e858de61
MB		 3474 AV* padav = (AV*)(AvARRAY(CvPADLIST(cv))[1]);
3475 sv = padav ? AvARRAY(padav)[o->op_targ] : Nullsv;
5aabfad6 3476 if (!sv || (!SvREADONLY(sv) && SvREFCNT(sv) > 1))
54310121 3477 return Nullsv;
760ac839 3478 }
54310121 3479 else
3480 return Nullsv;
760ac839 3481 }
5aabfad6 3482 if (sv)
3483 SvREADONLY_on(sv);
760ac839
LW		 3484 return sv;
3485}
3486
748a9306 3487CV *
8ac85365 3488newSUB(I32 floor, OP *o, OP *proto, OP *block)
79072805 3489{
11343788 3490 dTHR;
3280af22 3491 char *name = o ? SvPVx(cSVOPo->op_sv, PL_na) : Nullch;
55d729e4
GS		 3492 GV *gv = gv_fetchpv(name ? name : "__ANON__",
3493 GV_ADDMULTI | (block ? 0 : GV_NOINIT), SVt_PVCV);
3280af22 3494 char *ps = proto ? SvPVx(((SVOP*)proto)->op_sv, PL_na) : Nullch;
a2008d6d 3495 register CV *cv=0;
a0d0e21e 3496 I32 ix;
79072805 3497
11343788 3498 if (o)
5dc0d613 3499 SAVEFREEOP(o);
3fe9a6f1 3500 if (proto)
3501 SAVEFREEOP(proto);
3502
55d729e4
GS		 3503 if (SvTYPE(gv) != SVt_PVGV) { /* Prototype now, and had
3504 maximum a prototype before. */
3505 if (SvTYPE(gv) > SVt_NULL) {
3506 if (!SvPOK((SV*)gv) && !(SvIOK((SV*)gv) && SvIVX((SV*)gv) == -1))
3507 warn("Runaway prototype");
3508 cv_ckproto((CV*)gv, NULL, ps);
3509 }
3510 if (ps)
3511 sv_setpv((SV*)gv, ps);
3512 else
3513 sv_setiv((SV*)gv, -1);
3280af22
NIS		 3514 SvREFCNT_dec(PL_compcv);
3515 cv = PL_compcv = NULL;
3516 PL_sub_generation++;
55d729e4
GS		 3517 goto noblock;
3518 }
3519
68dc0745 3520 if (!name || GvCVGEN(gv))
3521 cv = Nullcv;
3522 else if (cv = GvCV(gv)) {
3fe9a6f1 3523 cv_ckproto(cv, gv, ps);
68dc0745 3524 /* already defined (or promised)? */
3525 if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3526 SV* const_sv;
fe5e78ed 3527 bool const_changed = TRUE;
aa689395 3528 if (!block) {
3529 /* just a "sub foo;" when &foo is already defined */
3280af22 3530 SAVEFREESV(PL_compcv);
aa689395 3531 goto done;
3532 }
7bac28a0 3533 /* ahem, death to those who redefine active sort subs */
3280af22 3534 if (PL_curstackinfo->si_type == PERLSI_SORT && PL_sortcop == CvSTART(cv))
7bac28a0 3535 croak("Can't redefine active sort subroutine %s", name);
fe5e78ed
GS		 3536 if(const_sv = cv_const_sv(cv))
3537 const_changed = sv_cmp(const_sv, op_const_sv(block, Nullcv));
3280af22 3538 if ((const_sv && const_changed) || PL_dowarn && !(CvGV(cv) && GvSTASH(CvGV(cv))
2f34f9d4
IZ		 3539 && HvNAME(GvSTASH(CvGV(cv)))
3540 && strEQ(HvNAME(GvSTASH(CvGV(cv))),
3541 "autouse"))) {
3280af22
NIS		 3542 line_t oldline = PL_curcop->cop_line;
3543 PL_curcop->cop_line = PL_copline;
760ac839 3544 warn(const_sv ? "Constant subroutine %s redefined"
68dc0745 3545 : "Subroutine %s redefined", name);
3280af22 3546 PL_curcop->cop_line = oldline;
79072805 3547 }
8990e307 3548 SvREFCNT_dec(cv);
68dc0745 3549 cv = Nullcv;
79072805
LW		 3550 }
3551 }
a0d0e21e 3552 if (cv) { /* must reuse cv if autoloaded */
4633a7c4 3553 cv_undef(cv);
3280af22
NIS		 3554 CvFLAGS(cv) = CvFLAGS(PL_compcv);
3555 CvOUTSIDE(cv) = CvOUTSIDE(PL_compcv);
3556 CvOUTSIDE(PL_compcv) = 0;
3557 CvPADLIST(cv) = CvPADLIST(PL_compcv);
3558 CvPADLIST(PL_compcv) = 0;
3559 if (SvREFCNT(PL_compcv) > 1) /* XXX Make closures transit through stub. */
3560 CvOUTSIDE(PL_compcv) = (CV*)SvREFCNT_inc((SV*)cv);
3561 SvREFCNT_dec(PL_compcv);
a0d0e21e
LW		 3562 }
3563 else {
3280af22 3564 cv = PL_compcv;
44a8e56a 3565 if (name) {
3566 GvCV(gv) = cv;
3567 GvCVGEN(gv) = 0;
3280af22 3568 PL_sub_generation++;
44a8e56a 3569 }
a0d0e21e 3570 }
44a8e56a 3571 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
3280af22
NIS		 3572 CvFILEGV(cv) = PL_curcop->cop_filegv;
3573 CvSTASH(cv) = PL_curstash;
11343788
MB		 3574#ifdef USE_THREADS
3575 CvOWNER(cv) = 0;
fc3ad51b 3576 if (!CvMUTEXP(cv)) {
f6aaf501 3577 New(666, CvMUTEXP(cv), 1, perl_mutex);
fc3ad51b
GB		 3578 MUTEX_INIT(CvMUTEXP(cv));
3579 }
11343788 3580#endif /* USE_THREADS */
8990e307 3581
3fe9a6f1 3582 if (ps)
3583 sv_setpv((SV*)cv, ps);
4633a7c4 3584
3280af22 3585 if (PL_error_count) {
c07a80fd 3586 op_free(block);
3587 block = Nullop;
68dc0745 3588 if (name) {
3589 char *s = strrchr(name, ':');
3590 s = s ? s+1 : name;
6d4c2119
CS		 3591 if (strEQ(s, "BEGIN")) {
3592 char *not_safe =
3593 "BEGIN not safe after errors--compilation aborted";
3280af22 3594 if (PL_in_eval & 4)
6d4c2119
CS		 3595 croak(not_safe);
3596 else {
3597 /* force display of errors found but not reported */
38a03e6e 3598 sv_catpv(ERRSV, not_safe);
3280af22 3599 croak("%s", SvPVx(ERRSV, PL_na));
6d4c2119
CS		 3600 }
3601 }
68dc0745 3602 }
c07a80fd 3603 }
a0d0e21e 3604 if (!block) {
55d729e4 3605 noblock:
3280af22 3606 PL_copline = NOLINE;
a0d0e21e
LW		 3607 LEAVE_SCOPE(floor);
3608 return cv;
3609 }
3610
3280af22
NIS		 3611 if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad))
3612 av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv);
a0d0e21e 3613
54310121 3614 if (CvCLONE(cv)) {
3280af22
NIS		 3615 SV **namep = AvARRAY(PL_comppad_name);
3616 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
54310121 3617 SV *namesv;
3618
3280af22 3619 if (SvIMMORTAL(PL_curpad[ix]))
54310121 3620 continue;
3621 /*
3622 * The only things that a clonable function needs in its
3623 * pad are references to outer lexicals and anonymous subs.
3624 * The rest are created anew during cloning.
3625 */
3626 if (!((namesv = namep[ix]) != Nullsv &&
3280af22 3627 namesv != &PL_sv_undef &&
54310121 3628 (SvFAKE(namesv) ||
3629 *SvPVX(namesv) == '&')))
3630 {
3280af22
NIS		 3631 SvREFCNT_dec(PL_curpad[ix]);
3632 PL_curpad[ix] = Nullsv;
54310121 3633 }
3634 }
a0d0e21e 3635 }
54310121 3636 else {
3637 AV *av = newAV(); /* Will be @_ */
3638 av_extend(av, 0);
3280af22 3639 av_store(PL_comppad, 0, (SV*)av);
54310121 3640 AvFLAGS(av) = AVf_REIFY;
79072805 3641
3280af22
NIS		 3642 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
3643 if (SvIMMORTAL(PL_curpad[ix]))
54310121 3644 continue;
3280af22
NIS		 3645 if (!SvPADMY(PL_curpad[ix]))
3646 SvPADTMP_on(PL_curpad[ix]);
54310121 3647 }
3648 }
79072805 3649
a0d0e21e 3650 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
79072805
LW		 3651 CvSTART(cv) = LINKLIST(CvROOT(cv));
3652 CvROOT(cv)->op_next = 0;
3653 peep(CvSTART(cv));
93a17b20 3654
44a8e56a 3655 if (name) {
3656 char *s;
3657
3280af22 3658 if (PERLDB_SUBLINE && PL_curstash != PL_debstash) {
46fc3d4c 3659 SV *sv = NEWSV(0,0);
44a8e56a 3660 SV *tmpstr = sv_newmortal();
549bb64a 3661 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
44a8e56a 3662 CV *cv;
3663 HV *hv;
3664
51790459 3665 sv_setpvf(sv, "%_:%ld-%ld",
3280af22
NIS		 3666 GvSV(PL_curcop->cop_filegv),
3667 (long)PL_subline, (long)PL_curcop->cop_line);
44a8e56a 3668 gv_efullname3(tmpstr, gv, Nullch);
3280af22 3669 hv_store(GvHV(PL_DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 3670 hv = GvHVn(db_postponed);
9607fc9c 3671 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX(tmpstr), SvCUR(tmpstr))
3672 && (cv = GvCV(db_postponed))) {
44a8e56a 3673 dSP;
924508f0 3674 PUSHMARK(SP);
44a8e56a 3675 XPUSHs(tmpstr);
3676 PUTBACK;
3677 perl_call_sv((SV*)cv, G_DISCARD);
3678 }
3679 }
79072805 3680
44a8e56a 3681 if ((s = strrchr(name,':')))
28757baa 3682 s++;
3683 else
3684 s = name;
68dc0745 3685 if (strEQ(s, "BEGIN")) {
3280af22 3686 I32 oldscope = PL_scopestack_ix;
28757baa 3687 ENTER;
3280af22
NIS		 3688 SAVESPTR(PL_compiling.cop_filegv);
3689 SAVEI16(PL_compiling.cop_line);
3690 save_svref(&PL_rs);
3691 sv_setsv(PL_rs, PL_nrs);
28757baa 3692
3280af22
NIS		 3693 if (!PL_beginav)
3694 PL_beginav = newAV();
28757baa 3695 DEBUG_x( dump_sub(gv) );
3280af22 3696 av_push(PL_beginav, (SV *)cv);
28757baa 3697 GvCV(gv) = 0;
3280af22 3698 call_list(oldscope, PL_beginav);
a6006777 3699
3280af22 3700 PL_curcop = &PL_compiling;
28757baa 3701 LEAVE;
3702 }
3280af22
NIS		 3703 else if (strEQ(s, "END") && !PL_error_count) {
3704 if (!PL_endav)
3705 PL_endav = newAV();
3706 av_unshift(PL_endav, 1);
3707 av_store(PL_endav, 0, (SV *)cv);
28757baa 3708 GvCV(gv) = 0;
3709 }
3280af22
NIS		 3710 else if (strEQ(s, "INIT") && !PL_error_count) {
3711 if (!PL_initav)
3712 PL_initav = newAV();
3713 av_push(PL_initav, SvREFCNT_inc(cv));
b7aad4fe 3714 GvCV(gv) = 0;
ae77835f 3715 }
79072805 3716 }
a6006777 3717
aa689395 3718 done:
3280af22 3719 PL_copline = NOLINE;
8990e307 3720 LEAVE_SCOPE(floor);
a0d0e21e 3721 return cv;
79072805
LW		 3722}
3723
5476c433
JD		 3724void
3725newCONSTSUB(HV *stash, char *name, SV *sv)
3726{
3727 dTHR;
3280af22
NIS		 3728 U32 oldhints = PL_hints;
3729 HV *old_cop_stash = PL_curcop->cop_stash;
3730 HV *old_curstash = PL_curstash;
3731 line_t oldline = PL_curcop->cop_line;
3732 PL_curcop->cop_line = PL_copline;
5476c433 3733
3280af22 3734 PL_hints &= ~HINT_BLOCK_SCOPE;
5476c433 3735 if(stash)
3280af22 3736 PL_curstash = PL_curcop->cop_stash = stash;
5476c433
JD		 3737
3738 newSUB(
be24f278 3739 start_subparse(FALSE, 0),
5476c433 3740 newSVOP(OP_CONST, 0, newSVpv(name,0)),
6b88bc9c 3741 newSVOP(OP_CONST, 0, &PL_sv_no), /* SvPV(&PL_sv_no) == "" -- GMB */
5476c433
JD		 3742 newSTATEOP(0, Nullch, newSVOP(OP_CONST, 0, sv))
3743 );
3744
3280af22
NIS		 3745 PL_hints = oldhints;
3746 PL_curcop->cop_stash = old_cop_stash;
3747 PL_curstash = old_curstash;
3748 PL_curcop->cop_line = oldline;
5476c433
JD		 3749}
3750
57d3b86d 3751CV *
e3b8966e 3752newXS(char *name, void (*subaddr) (CV * _CPERLproto), char *filename)
a0d0e21e 3753{
11343788 3754 dTHR;
44a8e56a 3755 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 3756 register CV *cv;
44a8e56a 3757
3758 if (cv = (name ? GvCV(gv) : Nullcv)) {
3759 if (GvCVGEN(gv)) {
3760 /* just a cached method */
3761 SvREFCNT_dec(cv);
3762 cv = 0;
3763 }
3764 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
3765 /* already defined (or promised) */
3280af22 3766 if (PL_dowarn && !(CvGV(cv) && GvSTASH(CvGV(cv))
2f34f9d4
IZ		 3767 && HvNAME(GvSTASH(CvGV(cv)))
3768 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "autouse"))) {
3280af22 3769 line_t oldline = PL_curcop->cop_line;
864beb6a
GB		 3770 if (PL_copline != NOLINE)
3771 PL_curcop->cop_line = PL_copline;
a0d0e21e 3772 warn("Subroutine %s redefined",name);
3280af22 3773 PL_curcop->cop_line = oldline;
a0d0e21e
LW		 3774 }
3775 SvREFCNT_dec(cv);
3776 cv = 0;
79072805 3777 }
79072805 3778 }
44a8e56a 3779
3780 if (cv) /* must reuse cv if autoloaded */
3781 cv_undef(cv);
a0d0e21e
LW		 3782 else {
3783 cv = (CV*)NEWSV(1105,0);
3784 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 3785 if (name) {
3786 GvCV(gv) = cv;
3787 GvCVGEN(gv) = 0;
3280af22 3788 PL_sub_generation++;
44a8e56a 3789 }
a0d0e21e 3790 }
5196be3e 3791 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
11343788 3792#ifdef USE_THREADS
12ca11f6 3793 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3794 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3795 CvOWNER(cv) = 0;
3796#endif /* USE_THREADS */
79072805 3797 CvFILEGV(cv) = gv_fetchfile(filename);
a0d0e21e 3798 CvXSUB(cv) = subaddr;
44a8e56a 3799
28757baa 3800 if (name) {
3801 char *s = strrchr(name,':');
3802 if (s)
3803 s++;
3804 else
3805 s = name;
3806 if (strEQ(s, "BEGIN")) {
3280af22
NIS		 3807 if (!PL_beginav)
3808 PL_beginav = newAV();
3809 av_push(PL_beginav, (SV *)cv);
44a8e56a 3810 GvCV(gv) = 0;
28757baa 3811 }
3812 else if (strEQ(s, "END")) {
3280af22
NIS		 3813 if (!PL_endav)
3814 PL_endav = newAV();
3815 av_unshift(PL_endav, 1);
3816 av_store(PL_endav, 0, (SV *)cv);
44a8e56a 3817 GvCV(gv) = 0;
28757baa 3818 }
7d07dbc2 3819 else if (strEQ(s, "INIT")) {
3280af22
NIS		 3820 if (!PL_initav)
3821 PL_initav = newAV();
3822 av_push(PL_initav, (SV *)cv);
22d87168 3823 GvCV(gv) = 0;
ae77835f 3824 }
28757baa 3825 }
8990e307 3826 else
a5f75d66 3827 CvANON_on(cv);
44a8e56a 3828
a0d0e21e 3829 return cv;
79072805
LW		 3830}
3831
3832void
8ac85365 3833newFORM(I32 floor, OP *o, OP *block)
79072805 3834{
11343788 3835 dTHR;
79072805
LW		 3836 register CV *cv;
3837 char *name;
3838 GV *gv;
a0d0e21e 3839 I32 ix;
79072805 3840
11343788 3841 if (o)
3280af22 3842 name = SvPVx(cSVOPo->op_sv, PL_na);
79072805
LW		 3843 else
3844 name = "STDOUT";
85e6fe83 3845 gv = gv_fetchpv(name,TRUE, SVt_PVFM);
a5f75d66 3846 GvMULTI_on(gv);
79072805 3847 if (cv = GvFORM(gv)) {
3280af22
NIS		 3848 if (PL_dowarn) {
3849 line_t oldline = PL_curcop->cop_line;
79072805 3850
3280af22 3851 PL_curcop->cop_line = PL_copline;
79072805 3852 warn("Format %s redefined",name);
3280af22 3853 PL_curcop->cop_line = oldline;
79072805 3854 }
8990e307 3855 SvREFCNT_dec(cv);
79072805 3856 }
3280af22 3857 cv = PL_compcv;
79072805 3858 GvFORM(gv) = cv;
44a8e56a 3859 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
3280af22 3860 CvFILEGV(cv) = PL_curcop->cop_filegv;
79072805 3861
3280af22
NIS		 3862 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
3863 if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix]))
3864 SvPADTMP_on(PL_curpad[ix]);
a0d0e21e
LW		 3865 }
3866
79072805
LW		 3867 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
3868 CvSTART(cv) = LINKLIST(CvROOT(cv));
3869 CvROOT(cv)->op_next = 0;
3870 peep(CvSTART(cv));
11343788 3871 op_free(o);
3280af22 3872 PL_copline = NOLINE;
8990e307 3873 LEAVE_SCOPE(floor);
79072805
LW		 3874}
3875
3876OP *
8ac85365 3877newANONLIST(OP *o)
79072805 3878{
93a17b20 3879 return newUNOP(OP_REFGEN, 0,
11343788 3880 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 3881}
3882
3883OP *
8ac85365 3884newANONHASH(OP *o)
79072805 3885{
93a17b20 3886 return newUNOP(OP_REFGEN, 0,
11343788 3887 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 3888}
3889
3890OP *
8ac85365 3891newANONSUB(I32 floor, OP *proto, OP *block)
a0d0e21e
LW		 3892{
3893 return newUNOP(OP_REFGEN, 0,
4633a7c4 3894 newSVOP(OP_ANONCODE, 0, (SV*)newSUB(floor, 0, proto, block)));
79072805
LW		 3895}
3896
3897OP *
8ac85365 3898oopsAV(OP *o)
79072805 3899{
ed6116ce
LW		 3900 switch (o->op_type) {
3901 case OP_PADSV:
3902 o->op_type = OP_PADAV;
3903 o->op_ppaddr = ppaddr[OP_PADAV];
22d87168 3904 return ref(o, OP_RV2AV);
ed6116ce
LW		 3905
3906 case OP_RV2SV:
79072805
LW		 3907 o->op_type = OP_RV2AV;
3908 o->op_ppaddr = ppaddr[OP_RV2AV];
3909 ref(o, OP_RV2AV);
ed6116ce
LW		 3910 break;
3911
3912 default:
79072805 3913 warn("oops: oopsAV");
ed6116ce
LW		 3914 break;
3915 }
79072805
LW		 3916 return o;
3917}
3918
3919OP *
8ac85365 3920oopsHV(OP *o)
79072805 3921{
ed6116ce
LW		 3922 switch (o->op_type) {
3923 case OP_PADSV:
3924 case OP_PADAV:
3925 o->op_type = OP_PADHV;
3926 o->op_ppaddr = ppaddr[OP_PADHV];
22d87168 3927 return ref(o, OP_RV2HV);
ed6116ce
LW		 3928
3929 case OP_RV2SV:
3930 case OP_RV2AV:
79072805
LW		 3931 o->op_type = OP_RV2HV;
3932 o->op_ppaddr = ppaddr[OP_RV2HV];
3933 ref(o, OP_RV2HV);
ed6116ce
LW		 3934 break;
3935
3936 default:
79072805 3937 warn("oops: oopsHV");
ed6116ce
LW		 3938 break;
3939 }
79072805
LW		 3940 return o;
3941}
3942
3943OP *
8ac85365 3944newAVREF(OP *o)
79072805 3945{
ed6116ce
LW		 3946 if (o->op_type == OP_PADANY) {
3947 o->op_type = OP_PADAV;
3948 o->op_ppaddr = ppaddr[OP_PADAV];
93a17b20 3949 return o;
ed6116ce 3950 }
79072805
LW		 3951 return newUNOP(OP_RV2AV, 0, scalar(o));
3952}
3953
3954OP *
8ac85365 3955newGVREF(I32 type, OP *o)
79072805 3956{
a0d0e21e
LW		 3957 if (type == OP_MAPSTART)
3958 return newUNOP(OP_NULL, 0, o);
748a9306 3959 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 3960}
3961
3962OP *
8ac85365 3963newHVREF(OP *o)
79072805 3964{
ed6116ce
LW		 3965 if (o->op_type == OP_PADANY) {
3966 o->op_type = OP_PADHV;
3967 o->op_ppaddr = ppaddr[OP_PADHV];
93a17b20 3968 return o;
ed6116ce 3969 }
79072805
LW		 3970 return newUNOP(OP_RV2HV, 0, scalar(o));
3971}
3972
3973OP *
8ac85365 3974oopsCV(OP *o)
79072805 3975{
463ee0b2 3976 croak("NOT IMPL LINE %d",__LINE__);
79072805
LW		 3977 /* STUB */
3978 return o;
3979}
3980
3981OP *
8ac85365 3982newCVREF(I32 flags, OP *o)
79072805 3983{
c07a80fd 3984 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 3985}
3986
3987OP *
8ac85365 3988newSVREF(OP *o)
79072805 3989{
ed6116ce
LW		 3990 if (o->op_type == OP_PADANY) {
3991 o->op_type = OP_PADSV;
3992 o->op_ppaddr = ppaddr[OP_PADSV];
93a17b20 3993 return o;
ed6116ce 3994 }
224a4551
MB		 3995 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
3996 o->op_flags |= OPpDONE_SVREF;
a863c7d1 3997 return o;
224a4551 3998 }
79072805
LW		 3999 return newUNOP(OP_RV2SV, 0, scalar(o));
4000}
4001
4002/* Check routines. */
4003
4004OP *
8ac85365 4005ck_anoncode(OP *o)
5f05dabc 4006{
178c6305
CS		 4007 PADOFFSET ix;
4008 SV* name;
4009
4010 name = NEWSV(1106,0);
4011 sv_upgrade(name, SVt_PVNV);
4012 sv_setpvn(name, "&", 1);
4013 SvIVX(name) = -1;
4014 SvNVX(name) = 1;
5dc0d613 4015 ix = pad_alloc(o->op_type, SVs_PADMY);
3280af22
NIS		 4016 av_store(PL_comppad_name, ix, name);
4017 av_store(PL_comppad, ix, cSVOPo->op_sv);
5dc0d613
MB		 4018 SvPADMY_on(cSVOPo->op_sv);
4019 cSVOPo->op_sv = Nullsv;
4020 cSVOPo->op_targ = ix;
4021 return o;
5f05dabc 4022}
4023
4024OP *
8ac85365 4025ck_bitop(OP *o)
55497cff 4026{
3280af22 4027 o->op_private = PL_hints;
5dc0d613 4028 return o;
55497cff 4029}
4030
4031OP *
8ac85365 4032ck_concat(OP *o)
79072805 4033{
11343788
MB		 4034 if (cUNOPo->op_first->op_type == OP_CONCAT)
4035 o->op_flags |= OPf_STACKED;
4036 return o;
79072805
LW		 4037}
4038
4039OP *
8ac85365 4040ck_spair(OP *o)
79072805 4041{
11343788 4042 if (o->op_flags & OPf_KIDS) {
79072805 4043 OP* newop;
a0d0e21e 4044 OP* kid;
5dc0d613
MB		 4045 OPCODE type = o->op_type;
4046 o = modkids(ck_fun(o), type);
11343788 4047 kid = cUNOPo->op_first;
a0d0e21e
LW		 4048 newop = kUNOP->op_first->op_sibling;
4049 if (newop &&
4050 (newop->op_sibling ||
4051 !(opargs[newop->op_type] & OA_RETSCALAR) ||
4052 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
4053 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
aeea060c 4054
11343788 4055 return o;
a0d0e21e
LW		 4056 }
4057 op_free(kUNOP->op_first);
4058 kUNOP->op_first = newop;
4059 }
11343788
MB		 4060 o->op_ppaddr = ppaddr[++o->op_type];
4061 return ck_fun(o);
a0d0e21e
LW		 4062}
4063
4064OP *
8ac85365 4065ck_delete(OP *o)
a0d0e21e 4066{
11343788 4067 o = ck_fun(o);
5dc0d613 4068 o->op_private = 0;
11343788
MB		 4069 if (o->op_flags & OPf_KIDS) {
4070 OP *kid = cUNOPo->op_first;
5f05dabc 4071 if (kid->op_type == OP_HSLICE)
5dc0d613 4072 o->op_private |= OPpSLICE;
5f05dabc 4073 else if (kid->op_type != OP_HELEM)
4074 croak("%s argument is not a HASH element or slice",
5dc0d613 4075 op_desc[o->op_type]);
a0d0e21e 4076 null(kid);
79072805 4077 }
11343788 4078 return o;
79072805
LW		 4079}
4080
4081OP *
8ac85365 4082ck_eof(OP *o)
79072805 4083{
11343788 4084 I32 type = o->op_type;
79072805 4085
11343788
MB		 4086 if (o->op_flags & OPf_KIDS) {
4087 if (cLISTOPo->op_first->op_type == OP_STUB) {
4088 op_free(o);
4089 o = newUNOP(type, OPf_SPECIAL,
d58bf5aa 4090 newGVOP(OP_GV, 0, gv_fetchpv("main::ARGV", TRUE, SVt_PVAV)));
8990e307 4091 }
11343788 4092 return ck_fun(o);
79072805 4093 }
11343788 4094 return o;
79072805
LW		 4095}
4096
4097OP *
8ac85365 4098ck_eval(OP *o)
79072805 4099{
3280af22 4100 PL_hints |= HINT_BLOCK_SCOPE;
11343788
MB		 4101 if (o->op_flags & OPf_KIDS) {
4102 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 4103
93a17b20 4104 if (!kid) {
11343788
MB		 4105 o->op_flags &= ~OPf_KIDS;
4106 null(o);
79072805
LW		 4107 }
4108 else if (kid->op_type == OP_LINESEQ) {
4109 LOGOP *enter;
4110
11343788
MB		 4111 kid->op_next = o->op_next;
4112 cUNOPo->op_first = 0;
4113 op_free(o);
79072805
LW		 4114
4115 Newz(1101, enter, 1, LOGOP);
4116 enter->op_type = OP_ENTERTRY;
4117 enter->op_ppaddr = ppaddr[OP_ENTERTRY];
4118 enter->op_private = 0;
4119
4120 /* establish postfix order */
4121 enter->op_next = (OP*)enter;
4122
11343788
MB		 4123 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
4124 o->op_type = OP_LEAVETRY;
4125 o->op_ppaddr = ppaddr[OP_LEAVETRY];
4126 enter->op_other = o;
4127 return o;
79072805 4128 }
c7cc6f1c 4129 else
473986ff 4130 scalar((OP*)kid);
79072805
LW		 4131 }
4132 else {
11343788 4133 op_free(o);
54b9620d 4134 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
79072805 4135 }
3280af22 4136 o->op_targ = (PADOFFSET)PL_hints;
11343788 4137 return o;
79072805
LW		 4138}
4139
4140OP *
8ac85365 4141ck_exec(OP *o)
79072805
LW		 4142{
4143 OP *kid;
11343788
MB		 4144 if (o->op_flags & OPf_STACKED) {
4145 o = ck_fun(o);
4146 kid = cUNOPo->op_first->op_sibling;
8990e307
LW		 4147 if (kid->op_type == OP_RV2GV)
4148 null(kid);
79072805 4149 }
463ee0b2 4150 else
11343788
MB		 4151 o = listkids(o);
4152 return o;
79072805
LW		 4153}
4154
4155OP *
8ac85365 4156ck_exists(OP *o)
5f05dabc 4157{
5196be3e
MB		 4158 o = ck_fun(o);
4159 if (o->op_flags & OPf_KIDS) {
4160 OP *kid = cUNOPo->op_first;
5f05dabc 4161 if (kid->op_type != OP_HELEM)
5196be3e 4162 croak("%s argument is not a HASH element", op_desc[o->op_type]);
5f05dabc 4163 null(kid);
4164 }
5196be3e 4165 return o;
5f05dabc 4166}
4167
4168OP *
8ac85365 4169ck_gvconst(register OP *o)
79072805
LW		 4170{
4171 o = fold_constants(o);
4172 if (o->op_type == OP_CONST)
4173 o->op_type = OP_GV;
4174 return o;
4175}
4176
4177OP *
8ac85365 4178ck_rvconst(register OP *o)
79072805 4179{
11343788
MB		 4180 dTHR;
4181 SVOP *kid = (SVOP*)cUNOPo->op_first;
85e6fe83 4182
3280af22 4183 o->op_private |= (PL_hints & HINT_STRICT_REFS);
79072805 4184 if (kid->op_type == OP_CONST) {
44a8e56a 4185 char *name;
4186 int iscv;
4187 GV *gv;
e30f1eb5
GB		 4188 SV *kidsv = kid->op_sv;
4189
4190 /* Is it a constant from cv_const_sv()? */
4191 if (SvROK(kidsv) && SvREADONLY(kidsv)) {
4192 SV *rsv = SvRV(kidsv);
4193 int svtype = SvTYPE(rsv);
4194 char *badtype = Nullch;
4195
4196 switch (o->op_type) {
4197 case OP_RV2SV:
4198 if (svtype > SVt_PVMG)
4199 badtype = "a SCALAR";
4200 break;
4201 case OP_RV2AV:
4202 if (svtype != SVt_PVAV)
4203 badtype = "an ARRAY";
4204 break;
4205 case OP_RV2HV:
4206 if (svtype != SVt_PVHV) {
4207 if (svtype == SVt_PVAV) { /* pseudohash? */
4208 SV **ksv = av_fetch((AV*)rsv, 0, FALSE);
4209 if (ksv && SvROK(*ksv)
4210 && SvTYPE(SvRV(*ksv)) == SVt_PVHV)
4211 {
4212 break;
4213 }
4214 }
4215 badtype = "a HASH";
4216 }
4217 break;
4218 case OP_RV2CV:
4219 if (svtype != SVt_PVCV)
4220 badtype = "a CODE";
4221 break;
4222 }
4223 if (badtype)
4224 croak("Constant is not %s reference", badtype);
4225 return o;
4226 }
4227 name = SvPV(kidsv, PL_na);
44a8e56a 4228
3280af22 4229 if ((PL_hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
44a8e56a 4230 char *badthing = Nullch;
5dc0d613 4231 switch (o->op_type) {
44a8e56a 4232 case OP_RV2SV:
4233 badthing = "a SCALAR";
4234 break;
4235 case OP_RV2AV:
4236 badthing = "an ARRAY";
4237 break;
4238 case OP_RV2HV:
4239 badthing = "a HASH";
4240 break;
4241 }
4242 if (badthing)
4243 croak(
4244 "Can't use bareword (\"%s\") as %s ref while \"strict refs\" in use",
4245 name, badthing);
4246 }
93233ece
CS		 4247 /*
4248 * This is a little tricky. We only want to add the symbol if we
4249 * didn't add it in the lexer. Otherwise we get duplicate strict
4250 * warnings. But if we didn't add it in the lexer, we must at
4251 * least pretend like we wanted to add it even if it existed before,
4252 * or we get possible typo warnings. OPpCONST_ENTERED says
4253 * whether the lexer already added THIS instance of this symbol.
4254 */
5196be3e 4255 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 4256 do {
44a8e56a 4257 gv = gv_fetchpv(name,
748a9306 4258 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 4259 iscv
4260 ? SVt_PVCV
11343788 4261 : o->op_type == OP_RV2SV
a0d0e21e 4262 ? SVt_PV
11343788 4263 : o->op_type == OP_RV2AV
a0d0e21e 4264 ? SVt_PVAV
11343788 4265 : o->op_type == OP_RV2HV
a0d0e21e
LW		 4266 ? SVt_PVHV
4267 : SVt_PVGV);
93233ece
CS		 4268 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
4269 if (gv) {
4270 kid->op_type = OP_GV;
4271 SvREFCNT_dec(kid->op_sv);
4272 kid->op_sv = SvREFCNT_inc(gv);
a0d0e21e 4273 }
79072805 4274 }
11343788 4275 return o;
79072805
LW		 4276}
4277
4278OP *
8ac85365 4279ck_ftst(OP *o)
79072805 4280{
11343788
MB		 4281 dTHR;
4282 I32 type = o->op_type;
79072805 4283
11343788
MB		 4284 if (o->op_flags & OPf_REF)
4285 return o;
79072805 4286
108ed793 4287 if (o->op_flags & OPf_KIDS && cUNOPo->op_first->op_type != OP_STUB) {
11343788 4288 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805
LW		 4289
4290 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
a0d0e21e 4291 OP *newop = newGVOP(type, OPf_REF,
3280af22 4292 gv_fetchpv(SvPVx(kid->op_sv, PL_na), TRUE, SVt_PVIO));
11343788 4293 op_free(o);
79072805
LW		 4294 return newop;
4295 }
4296 }
4297 else {
11343788 4298 op_free(o);
79072805 4299 if (type == OP_FTTTY)
fb73857a 4300 return newGVOP(type, OPf_REF, gv_fetchpv("main::STDIN", TRUE,
85e6fe83 4301 SVt_PVIO));
79072805 4302 else
54b9620d 4303 return newUNOP(type, 0, newDEFSVOP());
79072805 4304 }
11343788 4305 return o;
79072805
LW		 4306}
4307
4308OP *
8ac85365 4309ck_fun(OP *o)
79072805 4310{
11343788 4311 dTHR;
79072805
LW		 4312 register OP *kid;
4313 OP **tokid;
4314 OP *sibl;
4315 I32 numargs = 0;
11343788 4316 int type = o->op_type;
a0d0e21e 4317 register I32 oa = opargs[type] >> OASHIFT;
aeea060c 4318
11343788 4319 if (o->op_flags & OPf_STACKED) {
79072805
LW		 4320 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
4321 oa &= ~OA_OPTIONAL;
4322 else
11343788 4323 return no_fh_allowed(o);
79072805
LW		 4324 }
4325
11343788
MB		 4326 if (o->op_flags & OPf_KIDS) {
4327 tokid = &cLISTOPo->op_first;
4328 kid = cLISTOPo->op_first;
8990e307
LW		 4329 if (kid->op_type == OP_PUSHMARK ||
4330 kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK)
4331 {
79072805
LW		 4332 tokid = &kid->op_sibling;
4333 kid = kid->op_sibling;
4334 }
a0d0e21e 4335 if (!kid && opargs[type] & OA_DEFGV)
54b9620d 4336 *tokid = kid = newDEFSVOP();
79072805
LW		 4337
4338 while (oa && kid) {
4339 numargs++;
4340 sibl = kid->op_sibling;
4341 switch (oa & 7) {
4342 case OA_SCALAR:
4343 scalar(kid);
4344 break;
4345 case OA_LIST:
4346 if (oa < 16) {
4347 kid = 0;
4348 continue;
4349 }
4350 else
4351 list(kid);
4352 break;
4353 case OA_AVREF:
4354 if (kid->op_type == OP_CONST &&
4355 (kid->op_private & OPpCONST_BARE)) {
3280af22 4356 char *name = SvPVx(((SVOP*)kid)->op_sv, PL_na);
79072805 4357 OP *newop = newAVREF(newGVOP(OP_GV, 0,
85e6fe83 4358 gv_fetchpv(name, TRUE, SVt_PVAV) ));
3280af22 4359 if (PL_dowarn)
ff0cee69 4360 warn("Array @%s missing the @ in argument %ld of %s()",
4361 name, (long)numargs, op_desc[type]);
79072805
LW		 4362 op_free(kid);
4363 kid = newop;
4364 kid->op_sibling = sibl;
4365 *tokid = kid;
4366 }
8990e307 4367 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
11343788 4368 bad_type(numargs, "array", op_desc[o->op_type], kid);
a0d0e21e 4369 mod(kid, type);
79072805
LW		 4370 break;
4371 case OA_HVREF:
4372 if (kid->op_type == OP_CONST &&
4373 (kid->op_private & OPpCONST_BARE)) {
3280af22 4374 char *name = SvPVx(((SVOP*)kid)->op_sv, PL_na);
79072805 4375 OP *newop = newHVREF(newGVOP(OP_GV, 0,
85e6fe83 4376 gv_fetchpv(name, TRUE, SVt_PVHV) ));
3280af22 4377 if (PL_dowarn)
ff0cee69 4378 warn("Hash %%%s missing the %% in argument %ld of %s()",
4379 name, (long)numargs, op_desc[type]);
79072805
LW		 4380 op_free(kid);
4381 kid = newop;
4382 kid->op_sibling = sibl;
4383 *tokid = kid;
4384 }
8990e307 4385 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
11343788 4386 bad_type(numargs, "hash", op_desc[o->op_type], kid);
a0d0e21e 4387 mod(kid, type);
79072805
LW		 4388 break;
4389 case OA_CVREF:
4390 {
a0d0e21e 4391 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 4392 kid->op_sibling = 0;
4393 linklist(kid);
4394 newop->op_next = newop;
4395 kid = newop;
4396 kid->op_sibling = sibl;
4397 *tokid = kid;
4398 }
4399 break;
4400 case OA_FILEREF:
c340be78 4401 if (kid->op_type != OP_GV && kid->op_type != OP_RV2GV) {
79072805
LW		 4402 if (kid->op_type == OP_CONST &&
4403 (kid->op_private & OPpCONST_BARE)) {
4404 OP *newop = newGVOP(OP_GV, 0,
3280af22 4405 gv_fetchpv(SvPVx(((SVOP*)kid)->op_sv, PL_na), TRUE,
85e6fe83 4406 SVt_PVIO) );
79072805
LW		 4407 op_free(kid);
4408 kid = newop;
4409 }
0a42b372
GB		 4410 else if (kid->op_type == OP_READLINE) {
4411 /* neophyte patrol: open(<FH>), close(<FH>) etc. */
4412 bad_type(numargs, "HANDLE", op_desc[o->op_type], kid);
4413 }
79072805
LW		 4414 else {
4415 kid->op_sibling = 0;
4416 kid = newUNOP(OP_RV2GV, 0, scalar(kid));
4417 }
4418 kid->op_sibling = sibl;
4419 *tokid = kid;
4420 }
4421 scalar(kid);
4422 break;
4423 case OA_SCALARREF:
a0d0e21e 4424 mod(scalar(kid), type);
79072805
LW		 4425 break;
4426 }
4427 oa >>= 4;
4428 tokid = &kid->op_sibling;
4429 kid = kid->op_sibling;
4430 }
11343788 4431 o->op_private |= numargs;
79072805 4432 if (kid)
11343788
MB		 4433 return too_many_arguments(o,op_desc[o->op_type]);
4434 listkids(o);
79072805 4435 }
a0d0e21e 4436 else if (opargs[type] & OA_DEFGV) {
11343788 4437 op_free(o);
54b9620d 4438 return newUNOP(type, 0, newDEFSVOP());
a0d0e21e
LW		 4439 }
4440
79072805
LW		 4441 if (oa) {
4442 while (oa & OA_OPTIONAL)
4443 oa >>= 4;
4444 if (oa && oa != OA_LIST)
11343788 4445 return too_few_arguments(o,op_desc[o->op_type]);
79072805 4446 }
11343788 4447 return o;
79072805
LW		 4448}
4449
4450OP *
8ac85365 4451ck_glob(OP *o)
79072805 4452{
fb73857a 4453 GV *gv;
4454
1f2bfc8a 4455 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 4456 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 4457
4458 if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV)) && GvIMPORTED_CV(gv)))
4459 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
b1cb66bf 4460
4461 if (gv && GvIMPORTED_CV(gv)) {
46fc3d4c 4462 static int glob_index;
4463
5196be3e 4464 append_elem(OP_GLOB, o,
46fc3d4c 4465 newSVOP(OP_CONST, 0, newSViv(glob_index++)));
1f2bfc8a
MB		 4466 o->op_type = OP_LIST;
4467 o->op_ppaddr = ppaddr[OP_LIST];
4468 cLISTOPo->op_first->op_type = OP_PUSHMARK;
4469 cLISTOPo->op_first->op_ppaddr = ppaddr[OP_PUSHMARK];
4470 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 4471 append_elem(OP_LIST, o,
1f2bfc8a
MB		 4472 scalar(newUNOP(OP_RV2CV, 0,
4473 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 4474 o = newUNOP(OP_NULL, 0, ck_subr(o));
4475 o->op_targ = OP_GLOB; /* hint at what it used to be */
4476 return o;
b1cb66bf 4477 }
4478 gv = newGVgen("main");
a0d0e21e 4479 gv_IOadd(gv);
11343788
MB		 4480 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
4481 scalarkids(o);
4482 return ck_fun(o);
79072805
LW		 4483}
4484
4485OP *
8ac85365 4486ck_grep(OP *o)
79072805
LW		 4487{
4488 LOGOP *gwop;
4489 OP *kid;
11343788 4490 OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
79072805 4491
11343788 4492 o->op_ppaddr = ppaddr[OP_GREPSTART];
a0d0e21e 4493 Newz(1101, gwop, 1, LOGOP);
aeea060c 4494
11343788 4495 if (o->op_flags & OPf_STACKED) {
a0d0e21e 4496 OP* k;
11343788
MB		 4497 o = ck_sort(o);
4498 kid = cLISTOPo->op_first->op_sibling;
4499 for (k = cLISTOPo->op_first->op_sibling->op_next; k; k = k->op_next) {
a0d0e21e
LW		 4500 kid = k;
4501 }
4502 kid->op_next = (OP*)gwop;
11343788 4503 o->op_flags &= ~OPf_STACKED;
93a17b20 4504 }
11343788 4505 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 4506 if (type == OP_MAPWHILE)
4507 list(kid);
4508 else
4509 scalar(kid);
11343788 4510 o = ck_fun(o);
3280af22 4511 if (PL_error_count)
11343788 4512 return o;
aeea060c 4513 kid = cLISTOPo->op_first->op_sibling;
79072805 4514 if (kid->op_type != OP_NULL)
463ee0b2 4515 croak("panic: ck_grep");
79072805
LW		 4516 kid = kUNOP->op_first;
4517
a0d0e21e
LW		 4518 gwop->op_type = type;
4519 gwop->op_ppaddr = ppaddr[type];
11343788 4520 gwop->op_first = listkids(o);
79072805
LW		 4521 gwop->op_flags |= OPf_KIDS;
4522 gwop->op_private = 1;
4523 gwop->op_other = LINKLIST(kid);
a0d0e21e 4524 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
79072805
LW		 4525 kid->op_next = (OP*)gwop;
4526
11343788 4527 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 4528 if (!kid || !kid->op_sibling)
11343788 4529 return too_few_arguments(o,op_desc[o->op_type]);
a0d0e21e
LW		 4530 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
4531 mod(kid, OP_GREPSTART);
4532
79072805
LW		 4533 return (OP*)gwop;
4534}
4535
4536OP *
8ac85365 4537ck_index(OP *o)
79072805 4538{
11343788
MB		 4539 if (o->op_flags & OPf_KIDS) {
4540 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
fb5b0d60
LW		 4541 if (kid)
4542 kid = kid->op_sibling; /* get past "big" */
79072805 4543 if (kid && kid->op_type == OP_CONST)
2779dcf1 4544 fbm_compile(((SVOP*)kid)->op_sv, 0);
79072805 4545 }
11343788 4546 return ck_fun(o);
79072805
LW		 4547}
4548
4549OP *
8ac85365 4550ck_lengthconst(OP *o)
79072805
LW		 4551{
4552 /* XXX length optimization goes here */
11343788 4553 return ck_fun(o);
79072805
LW		 4554}
4555
4556OP *
8ac85365 4557ck_lfun(OP *o)
79072805 4558{
5dc0d613
MB		 4559 OPCODE type = o->op_type;
4560 return modkids(ck_fun(o), type);
79072805
LW		 4561}
4562
4563OP *
8ac85365 4564ck_rfun(OP *o)
8990e307 4565{
5dc0d613
MB		 4566 OPCODE type = o->op_type;
4567 return refkids(ck_fun(o), type);
8990e307
LW		 4568}
4569
4570OP *
8ac85365 4571ck_listiob(OP *o)
79072805
LW		 4572{
4573 register OP *kid;
aeea060c 4574
11343788 4575 kid = cLISTOPo->op_first;
79072805 4576 if (!kid) {
11343788
MB		 4577 o = force_list(o);
4578 kid = cLISTOPo->op_first;
79072805
LW		 4579 }
4580 if (kid->op_type == OP_PUSHMARK)
4581 kid = kid->op_sibling;
11343788 4582 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 4583 kid = kid->op_sibling;
4584 else if (kid && !kid->op_sibling) { /* print HANDLE; */
4585 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 4586 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 4587 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 4588 cLISTOPo->op_first->op_sibling = kid;
4589 cLISTOPo->op_last = kid;
79072805
LW		 4590 kid = kid->op_sibling;
4591 }
4592 }
4593
4594 if (!kid)
54b9620d 4595 append_elem(o->op_type, o, newDEFSVOP());
79072805 4596
5dc0d613 4597 o = listkids(o);
bbce6d69 4598
5dc0d613 4599 o->op_private = 0;
36477c24 4600#ifdef USE_LOCALE
3280af22 4601 if (PL_hints & HINT_LOCALE)
5dc0d613 4602 o->op_private |= OPpLOCALE;
bbce6d69 4603#endif
4604
5dc0d613 4605 return o;
bbce6d69 4606}
4607
4608OP *
8ac85365 4609ck_fun_locale(OP *o)
bbce6d69 4610{
5dc0d613 4611 o = ck_fun(o);
bbce6d69 4612
5dc0d613 4613 o->op_private = 0;
36477c24 4614#ifdef USE_LOCALE
3280af22 4615 if (PL_hints & HINT_LOCALE)
5dc0d613 4616 o->op_private |= OPpLOCALE;
bbce6d69 4617#endif
4618
5dc0d613 4619 return o;
bbce6d69 4620}
4621
4622OP *
8ac85365 4623ck_scmp(OP *o)
bbce6d69 4624{
5dc0d613 4625 o->op_private = 0;
36477c24 4626#ifdef USE_LOCALE
3280af22 4627 if (PL_hints & HINT_LOCALE)
5dc0d613 4628 o->op_private |= OPpLOCALE;
bbce6d69 4629#endif
36477c24 4630
5dc0d613 4631 return o;
79072805
LW		 4632}
4633
4634OP *
8ac85365 4635ck_match(OP *o)
79072805 4636{
5dc0d613 4637 o->op_private |= OPpRUNTIME;
11343788 4638 return o;
79072805
LW		 4639}
4640
4641OP *
8ac85365 4642ck_null(OP *o)
79072805 4643{
11343788 4644 return o;
79072805
LW		 4645}
4646
4647OP *
8ac85365 4648ck_repeat(OP *o)
79072805 4649{
11343788
MB		 4650 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
4651 o->op_private |= OPpREPEAT_DOLIST;
4652 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 4653 }
4654 else
11343788
MB		 4655 scalar(o);
4656 return o;
79072805
LW		 4657}
4658
4659OP *
8ac85365 4660ck_require(OP *o)
8990e307 4661{
11343788
MB		 4662 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
4663 SVOP *kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 4664
4665 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
8990e307 4666 char *s;
a0d0e21e
LW		 4667 for (s = SvPVX(kid->op_sv); *s; s++) {
4668 if (*s == ':' && s[1] == ':') {
4669 *s = '/';
1aef975c 4670 Move(s+2, s+1, strlen(s+2)+1, char);
a0d0e21e
LW		 4671 --SvCUR(kid->op_sv);
4672 }
8990e307 4673 }
a0d0e21e 4674 sv_catpvn(kid->op_sv, ".pm", 3);
8990e307
LW		 4675 }
4676 }
11343788 4677 return ck_fun(o);
8990e307
LW		 4678}
4679
4680OP *
8ac85365 4681ck_retarget(OP *o)
79072805 4682{
463ee0b2 4683 croak("NOT IMPL LINE %d",__LINE__);
79072805 4684 /* STUB */
11343788 4685 return o;
79072805
LW		 4686}
4687
4688OP *
8ac85365 4689ck_select(OP *o)
79072805 4690{
c07a80fd 4691 OP* kid;
11343788
MB		 4692 if (o->op_flags & OPf_KIDS) {
4693 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 4694 if (kid && kid->op_sibling) {
11343788
MB		 4695 o->op_type = OP_SSELECT;
4696 o->op_ppaddr = ppaddr[OP_SSELECT];
4697 o = ck_fun(o);
4698 return fold_constants(o);
79072805
LW		 4699 }
4700 }
11343788
MB		 4701 o = ck_fun(o);
4702 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 4703 if (kid && kid->op_type == OP_RV2GV)
4704 kid->op_private &= ~HINT_STRICT_REFS;
11343788 4705 return o;
79072805
LW		 4706}
4707
4708OP *
8ac85365 4709ck_shift(OP *o)
79072805 4710{
11343788 4711 I32 type = o->op_type;
79072805 4712
11343788 4713 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2
MB		 4714 OP *argop;
4715
11343788 4716 op_free(o);
6d4ff0d2 4717#ifdef USE_THREADS
533c011a 4718 if (!CvUNIQUE(PL_compcv)) {
6d4ff0d2 4719 argop = newOP(OP_PADAV, OPf_REF);
6b88bc9c 4720 argop->op_targ = 0; /* PL_curpad[0] is @_ */
6d4ff0d2
MB		 4721 }
4722 else {
4723 argop = newUNOP(OP_RV2AV, 0,
4724 scalar(newGVOP(OP_GV, 0,
4725 gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
4726 }
4727#else
4728 argop = newUNOP(OP_RV2AV, 0,
3280af22
NIS		 4729 scalar(newGVOP(OP_GV, 0, !CvUNIQUE(PL_compcv) ?
4730 PL_defgv : gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
6d4ff0d2
MB		 4731#endif /* USE_THREADS */
4732 return newUNOP(type, 0, scalar(argop));
79072805 4733 }
11343788 4734 return scalar(modkids(ck_fun(o), type));
79072805
LW		 4735}
4736
4737OP *
8ac85365 4738ck_sort(OP *o)
79072805 4739{
5dc0d613 4740 o->op_private = 0;
36477c24 4741#ifdef USE_LOCALE
3280af22 4742 if (PL_hints & HINT_LOCALE)
5dc0d613 4743 o->op_private |= OPpLOCALE;
bbce6d69 4744#endif
4745
11343788
MB		 4746 if (o->op_flags & OPf_STACKED) {
4747 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
463ee0b2
LW		 4748 OP *k;
4749 kid = kUNOP->op_first; /* get past rv2gv */
79072805 4750
463ee0b2 4751 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 4752 linklist(kid);
463ee0b2
LW		 4753 if (kid->op_type == OP_SCOPE) {
4754 k = kid->op_next;
4755 kid->op_next = 0;
79072805 4756 }
463ee0b2 4757 else if (kid->op_type == OP_LEAVE) {
11343788 4758 if (o->op_type == OP_SORT) {
748a9306
LW		 4759 null(kid); /* wipe out leave */
4760 kid->op_next = kid;
463ee0b2 4761
748a9306
LW		 4762 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
4763 if (k->op_next == kid)
4764 k->op_next = 0;
4765 }
463ee0b2 4766 }
748a9306
LW		 4767 else
4768 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 4769 k = kLISTOP->op_first;
463ee0b2 4770 }
a0d0e21e
LW		 4771 peep(k);
4772
11343788 4773 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
8990e307 4774 null(kid); /* wipe out rv2gv */
11343788 4775 if (o->op_type == OP_SORT)
a0d0e21e
LW		 4776 kid->op_next = kid;
4777 else
4778 kid->op_next = k;
11343788 4779 o->op_flags |= OPf_SPECIAL;
79072805 4780 }
7a4920e6
GB		 4781 else if (kid->op_type == OP_RV2SV || kid->op_type == OP_PADSV)
4782 null(cLISTOPo->op_first->op_sibling);
4783 }
bbce6d69 4784
11343788 4785 return o;
79072805
LW		 4786}
4787
4788OP *
8ac85365 4789ck_split(OP *o)
79072805
LW		 4790{
4791 register OP *kid;
aeea060c 4792
11343788
MB		 4793 if (o->op_flags & OPf_STACKED)
4794 return no_fh_allowed(o);
79072805 4795
11343788 4796 kid = cLISTOPo->op_first;
8990e307 4797 if (kid->op_type != OP_NULL)
463ee0b2 4798 croak("panic: ck_split");
8990e307 4799 kid = kid->op_sibling;
11343788
MB		 4800 op_free(cLISTOPo->op_first);
4801 cLISTOPo->op_first = kid;
85e6fe83 4802 if (!kid) {
11343788
MB		 4803 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpv(" ", 1));
4804 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 4805 }
79072805
LW		 4806
4807 if (kid->op_type != OP_MATCH) {
4808 OP *sibl = kid->op_sibling;
463ee0b2 4809 kid->op_sibling = 0;
79072805 4810 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, Nullop);
11343788
MB		 4811 if (cLISTOPo->op_first == cLISTOPo->op_last)
4812 cLISTOPo->op_last = kid;
4813 cLISTOPo->op_first = kid;
79072805
LW		 4814 kid->op_sibling = sibl;
4815 }
4816
4817 kid->op_type = OP_PUSHRE;
4818 kid->op_ppaddr = ppaddr[OP_PUSHRE];
4819 scalar(kid);
4820
4821 if (!kid->op_sibling)
54b9620d 4822 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 4823
4824 kid = kid->op_sibling;
4825 scalar(kid);
4826
4827 if (!kid->op_sibling)
11343788 4828 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
79072805
LW		 4829
4830 kid = kid->op_sibling;
4831 scalar(kid);
4832
4833 if (kid->op_sibling)
11343788 4834 return too_many_arguments(o,op_desc[o->op_type]);
79072805 4835
11343788 4836 return o;
79072805
LW		 4837}
4838
4839OP *
8ac85365 4840ck_subr(OP *o)
79072805 4841{
11343788
MB		 4842 dTHR;
4843 OP *prev = ((cUNOPo->op_first->op_sibling)
4844 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
4845 OP *o2 = prev->op_sibling;
4633a7c4
LW		 4846 OP *cvop;
4847 char *proto = 0;
4848 CV *cv = 0;
46fc3d4c 4849 GV *namegv = 0;
4633a7c4
LW		 4850 int optional = 0;
4851 I32 arg = 0;
4852
11343788 4853 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 4854 if (cvop->op_type == OP_RV2CV) {
4855 SVOP* tmpop;
11343788 4856 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
4633a7c4
LW		 4857 null(cvop); /* disable rv2cv */
4858 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
4859 if (tmpop->op_type == OP_GV) {
8ebc5c01 4860 cv = GvCVu(tmpop->op_sv);
5dc0d613 4861 if (cv && SvPOK(cv) && !(o->op_private & OPpENTERSUB_AMPER)) {
46fc3d4c 4862 namegv = CvANON(cv) ? (GV*)tmpop->op_sv : CvGV(cv);
3280af22 4863 proto = SvPV((SV*)cv, PL_na);
46fc3d4c 4864 }
4633a7c4
LW		 4865 }
4866 }
3280af22
NIS		 4867 o->op_private |= (PL_hints & HINT_STRICT_REFS);
4868 if (PERLDB_SUB && PL_curstash != PL_debstash)
11343788
MB		 4869 o->op_private |= OPpENTERSUB_DB;
4870 while (o2 != cvop) {
4633a7c4
LW		 4871 if (proto) {
4872 switch (*proto) {
4873 case '\0':
5dc0d613 4874 return too_many_arguments(o, gv_ename(namegv));
4633a7c4
LW		 4875 case ';':
4876 optional = 1;
4877 proto++;
4878 continue;
4879 case '$':
4880 proto++;
4881 arg++;
11343788 4882 scalar(o2);
4633a7c4
LW		 4883 break;
4884 case '%':
4885 case '@':
11343788 4886 list(o2);
4633a7c4
LW		 4887 arg++;
4888 break;
4889 case '&':
4890 proto++;
4891 arg++;
11343788 4892 if (o2->op_type != OP_REFGEN && o2->op_type != OP_UNDEF)
5dc0d613 4893 bad_type(arg, "block", gv_ename(namegv), o2);
4633a7c4
LW		 4894 break;
4895 case '*':
4896 proto++;
4897 arg++;
11343788 4898 if (o2->op_type == OP_RV2GV)
4633a7c4
LW		 4899 goto wrapref;
4900 {
11343788 4901 OP* kid = o2;
69dcf70c 4902 OP* sib = kid->op_sibling;
4633a7c4 4903 kid->op_sibling = 0;
69dcf70c
MB		 4904 o2 = newUNOP(OP_RV2GV, 0, kid);
4905 o2->op_sibling = sib;
6fa846a0 4906 prev->op_sibling = o2;
4633a7c4
LW		 4907 }
4908 goto wrapref;
4909 case '\\':
4910 proto++;
4911 arg++;
4912 switch (*proto++) {
4913 case '*':
11343788 4914 if (o2->op_type != OP_RV2GV)
5dc0d613 4915 bad_type(arg, "symbol", gv_ename(namegv), o2);
4633a7c4
LW		 4916 goto wrapref;
4917 case '&':
11343788 4918 if (o2->op_type != OP_RV2CV)
5dc0d613 4919 bad_type(arg, "sub", gv_ename(namegv), o2);
4633a7c4
LW		 4920 goto wrapref;
4921 case '$':
386acf99
GS		 4922 if (o2->op_type != OP_RV2SV
4923 && o2->op_type != OP_PADSV
4924 && o2->op_type != OP_THREADSV)
4925 {
5dc0d613 4926 bad_type(arg, "scalar", gv_ename(namegv), o2);
386acf99 4927 }
4633a7c4
LW		 4928 goto wrapref;
4929 case '@':
11343788 4930 if (o2->op_type != OP_RV2AV && o2->op_type != OP_PADAV)
5dc0d613 4931 bad_type(arg, "array", gv_ename(namegv), o2);
4633a7c4
LW		 4932 goto wrapref;
4933 case '%':
11343788 4934 if (o2->op_type != OP_RV2HV && o2->op_type != OP_PADHV)
5dc0d613 4935 bad_type(arg, "hash", gv_ename(namegv), o2);
4633a7c4
LW		 4936 wrapref:
4937 {
11343788 4938 OP* kid = o2;
6fa846a0 4939 OP* sib = kid->op_sibling;
4633a7c4 4940 kid->op_sibling = 0;
6fa846a0
GS		 4941 o2 = newUNOP(OP_REFGEN, 0, kid);
4942 o2->op_sibling = sib;
e858de61 4943 prev->op_sibling = o2;
4633a7c4
LW		 4944 }
4945 break;
4946 default: goto oops;
4947 }
4948 break;
b1cb66bf 4949 case ' ':
4950 proto++;
4951 continue;
4633a7c4
LW		 4952 default:
4953 oops:
4954 croak("Malformed prototype for %s: %s",
3280af22 4955 gv_ename(namegv), SvPV((SV*)cv, PL_na));
4633a7c4
LW		 4956 }
4957 }
4958 else
11343788
MB		 4959 list(o2);
4960 mod(o2, OP_ENTERSUB);
4961 prev = o2;
4962 o2 = o2->op_sibling;
4633a7c4 4963 }
fb73857a 4964 if (proto && !optional &&
4965 (*proto && *proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 4966 return too_few_arguments(o, gv_ename(namegv));
11343788 4967 return o;
79072805
LW		 4968}
4969
4970OP *
8ac85365 4971ck_svconst(OP *o)
8990e307 4972{
11343788
MB		 4973 SvREADONLY_on(cSVOPo->op_sv);
4974 return o;
8990e307
LW		 4975}
4976
4977OP *
8ac85365 4978ck_trunc(OP *o)
79072805 4979{
11343788
MB		 4980 if (o->op_flags & OPf_KIDS) {
4981 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 4982
a0d0e21e
LW		 4983 if (kid->op_type == OP_NULL)
4984 kid = (SVOP*)kid->op_sibling;
4985 if (kid &&
4986 kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE))
11343788 4987 o->op_flags |= OPf_SPECIAL;
79072805 4988 }
11343788 4989 return ck_fun(o);
79072805
LW		 4990}
4991
463ee0b2
LW		 4992/* A peephole optimizer. We visit the ops in the order they're to execute. */
4993
79072805 4994void
8ac85365 4995peep(register OP *o)
79072805 4996{
11343788 4997 dTHR;
79072805 4998 register OP* oldop = 0;
a0d0e21e 4999 if (!o || o->op_seq)
79072805 5000 return;
a0d0e21e 5001 ENTER;
462e5cf6 5002 SAVEOP();
3280af22 5003 SAVESPTR(PL_curcop);
a0d0e21e
LW		 5004 for (; o; o = o->op_next) {
5005 if (o->op_seq)
5006 break;
3280af22
NIS		 5007 if (!PL_op_seqmax)
5008 PL_op_seqmax++;
533c011a 5009 PL_op = o;
a0d0e21e
LW		 5010 switch (o->op_type) {
5011 case OP_NEXTSTATE:
5012 case OP_DBSTATE:
3280af22
NIS		 5013 PL_curcop = ((COP*)o); /* for warnings */
5014 o->op_seq = PL_op_seqmax++;
a0d0e21e
LW		 5015 break;
5016
5017 case OP_CONCAT:
5018 case OP_CONST:
5019 case OP_JOIN:
5020 case OP_UC:
5021 case OP_UCFIRST:
5022 case OP_LC:
5023 case OP_LCFIRST:
5024 case OP_QUOTEMETA:
3c4f770c 5025 if (o->op_next && o->op_next->op_type == OP_STRINGIFY)
a0d0e21e 5026 null(o->op_next);
3280af22 5027 o->op_seq = PL_op_seqmax++;
a0d0e21e 5028 break;
8990e307 5029 case OP_STUB:
54310121 5030 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
3280af22 5031 o->op_seq = PL_op_seqmax++;
54310121 5032 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 5033 }
748a9306 5034 goto nothin;
79072805 5035 case OP_NULL:
748a9306 5036 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
3280af22 5037 PL_curcop = ((COP*)o);
748a9306 5038 goto nothin;
79072805 5039 case OP_SCALAR:
93a17b20 5040 case OP_LINESEQ:
463ee0b2 5041 case OP_SCOPE:
748a9306 5042 nothin:
a0d0e21e
LW		 5043 if (oldop && o->op_next) {
5044 oldop->op_next = o->op_next;
79072805
LW		 5045 continue;
5046 }
3280af22 5047 o->op_seq = PL_op_seqmax++;
79072805
LW		 5048 break;
5049
5050 case OP_GV:
a0d0e21e 5051 if (o->op_next->op_type == OP_RV2SV) {
5f05dabc 5052 if (!(o->op_next->op_private & OPpDEREF)) {
a0d0e21e
LW		 5053 null(o->op_next);
5054 o->op_private |= o->op_next->op_private & OPpLVAL_INTRO;
5055 o->op_next = o->op_next->op_next;
5056 o->op_type = OP_GVSV;
5057 o->op_ppaddr = ppaddr[OP_GVSV];
8990e307
LW		 5058 }
5059 }
a0d0e21e
LW		 5060 else if (o->op_next->op_type == OP_RV2AV) {
5061 OP* pop = o->op_next->op_next;
5062 IV i;
8990e307 5063 if (pop->op_type == OP_CONST &&
533c011a 5064 (PL_op = pop->op_next) &&
8990e307 5065 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 5066 !(pop->op_next->op_private &
68dc0745 5067 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF)) &&
3280af22 5068 (i = SvIV(((SVOP*)pop)->op_sv) - PL_compiling.cop_arybase)
a0d0e21e 5069 <= 255 &&
8990e307
LW		 5070 i >= 0)
5071 {
748a9306 5072 SvREFCNT_dec(((SVOP*)pop)->op_sv);
a0d0e21e 5073 null(o->op_next);
8990e307
LW		 5074 null(pop->op_next);
5075 null(pop);
a0d0e21e
LW		 5076 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
5077 o->op_next = pop->op_next->op_next;
5078 o->op_type = OP_AELEMFAST;
5079 o->op_ppaddr = ppaddr[OP_AELEMFAST];
5080 o->op_private = (U8)i;
a6006777 5081 GvAVn(((GVOP*)o)->op_gv);
8990e307 5082 }
79072805 5083 }
3280af22 5084 o->op_seq = PL_op_seqmax++;
79072805
LW		 5085 break;
5086
a0d0e21e 5087 case OP_MAPWHILE:
79072805
LW		 5088 case OP_GREPWHILE:
5089 case OP_AND:
5090 case OP_OR:
3280af22 5091 o->op_seq = PL_op_seqmax++;
fd4d1407
IZ		 5092 while (cLOGOP->op_other->op_type == OP_NULL)
5093 cLOGOP->op_other = cLOGOP->op_other->op_next;
79072805
LW		 5094 peep(cLOGOP->op_other);
5095 break;
5096
5097 case OP_COND_EXPR:
3280af22 5098 o->op_seq = PL_op_seqmax++;
79072805
LW		 5099 peep(cCONDOP->op_true);
5100 peep(cCONDOP->op_false);
5101 break;
5102
5103 case OP_ENTERLOOP:
3280af22 5104 o->op_seq = PL_op_seqmax++;
79072805
LW		 5105 peep(cLOOP->op_redoop);
5106 peep(cLOOP->op_nextop);
5107 peep(cLOOP->op_lastop);
5108 break;
5109
8782bef2 5110 case OP_QR:
79072805
LW		 5111 case OP_MATCH:
5112 case OP_SUBST:
3280af22 5113 o->op_seq = PL_op_seqmax++;
a0d0e21e 5114 peep(cPMOP->op_pmreplstart);
79072805
LW		 5115 break;
5116
a0d0e21e 5117 case OP_EXEC:
3280af22
NIS		 5118 o->op_seq = PL_op_seqmax++;
5119 if (PL_dowarn && o->op_next && o->op_next->op_type == OP_NEXTSTATE) {
a0d0e21e 5120 if (o->op_next->op_sibling &&
20408e3c
GS		 5121 o->op_next->op_sibling->op_type != OP_EXIT &&
5122 o->op_next->op_sibling->op_type != OP_WARN &&
a0d0e21e 5123 o->op_next->op_sibling->op_type != OP_DIE) {
3280af22 5124 line_t oldline = PL_curcop->cop_line;
a0d0e21e 5125
3280af22 5126 PL_curcop->cop_line = ((COP*)o->op_next)->cop_line;
a0d0e21e
LW		 5127 warn("Statement unlikely to be reached");
5128 warn("(Maybe you meant system() when you said exec()?)\n");
3280af22 5129 PL_curcop->cop_line = oldline;
a0d0e21e
LW		 5130 }
5131 }
5132 break;
aeea060c 5133
c750a3ec
MB		 5134 case OP_HELEM: {
5135 UNOP *rop;
5136 SV *lexname;
5137 GV **fields;
5138 SV **svp, **indsvp;
5139 I32 ind;
5140 char *key;
5141 STRLEN keylen;
aeea060c 5142
c750a3ec
MB		 5143 if (o->op_private & (OPpDEREF_HV|OPpDEREF_AV|OPpLVAL_INTRO)
5144 || ((BINOP*)o)->op_last->op_type != OP_CONST)
5145 break;
5146 rop = (UNOP*)((BINOP*)o)->op_first;
5147 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
5148 break;
3280af22 5149 lexname = *av_fetch(PL_comppad_name, rop->op_first->op_targ, TRUE);
c750a3ec
MB		 5150 if (!SvOBJECT(lexname))
5151 break;
5196be3e 5152 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
c750a3ec
MB		 5153 if (!fields || !GvHV(*fields))
5154 break;
5155 svp = &((SVOP*)((BINOP*)o)->op_last)->op_sv;
5156 key = SvPV(*svp, keylen);
5157 indsvp = hv_fetch(GvHV(*fields), key, keylen, FALSE);
5158 if (!indsvp) {
5159 croak("No such field \"%s\" in variable %s of type %s",
3280af22 5160 key, SvPV(lexname, PL_na), HvNAME(SvSTASH(lexname)));
c750a3ec
MB		 5161 }
5162 ind = SvIV(*indsvp);
5163 if (ind < 1)
5164 croak("Bad index while coercing array into hash");
5165 rop->op_type = OP_RV2AV;
5166 rop->op_ppaddr = ppaddr[OP_RV2AV];
5167 o->op_type = OP_AELEM;
5168 o->op_ppaddr = ppaddr[OP_AELEM];
5169 SvREFCNT_dec(*svp);
5170 *svp = newSViv(ind);
5171 break;
5172 }
5173
79072805 5174 default:
3280af22 5175 o->op_seq = PL_op_seqmax++;
79072805
LW		 5176 break;
5177 }
a0d0e21e 5178 oldop = o;
79072805 5179 }
a0d0e21e 5180 LEAVE;
79072805 5181}
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