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Battle namespace pollution.
[perl5.git] / op.c
CommitLineData
a0d0e21e 1/* op.c
79072805 2 *
4eb8286e 3 * Copyright (c) 1991-1999, 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"
864dbfa3 19#define PERL_IN_OP_C
79072805 20#include "perl.h"
77ca0c92 21#include "keywords.h"
79072805 22
b7dc083c
NIS		 23/* #define PL_OP_SLAB_ALLOC */
24
25#ifdef PL_OP_SLAB_ALLOC
26#define SLAB_SIZE 8192
27static char *PL_OpPtr = NULL;
28static int PL_OpSpace = 0;
29#define NewOp(m,var,c,type) do { if ((PL_OpSpace -= c*sizeof(type)) >= 0) \
30 var = (type *)(PL_OpPtr -= c*sizeof(type)); \
31 else \
32 var = (type *) Slab_Alloc(m,c*sizeof(type)); \
33 } while (0)
34
864dbfa3 35STATIC void *
cea2e8a9 36S_Slab_Alloc(pTHX_ int m, size_t sz)
b7dc083c
NIS		 37{
38 Newz(m,PL_OpPtr,SLAB_SIZE,char);
39 PL_OpSpace = SLAB_SIZE - sz;
40 return PL_OpPtr += PL_OpSpace;
41}
76e3520e 42
b7dc083c
NIS		 43#else
44#define NewOp(m, var, c, type) Newz(m, var, c, type)
45#endif
e50aee73 46/*
5dc0d613 47 * In the following definition, the ", Nullop" is just to make the compiler
a5f75d66 48 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 49 */
11343788 50#define CHECKOP(type,o) \
3280af22 51 ((PL_op_mask && PL_op_mask[type]) \
5dc0d613 52 ? ( op_free((OP*)o), \
cea2e8a9 53 Perl_croak(aTHX_ "%s trapped by operation mask", PL_op_desc[type]), \
28757baa 54 Nullop ) \
fc0dc3b3 55 : CALL_FPTR(PL_check[type])(aTHX_ (OP*)o))
e50aee73 56
c53d7c7d
HS		 57#define PAD_MAX 999999999
58
76e3520e 59STATIC char*
cea2e8a9 60S_gv_ename(pTHX_ GV *gv)
4633a7c4 61{
2d8e6c8d 62 STRLEN n_a;
4633a7c4 63 SV* tmpsv = sv_newmortal();
46fc3d4c 64 gv_efullname3(tmpsv, gv, Nullch);
2d8e6c8d 65 return SvPV(tmpsv,n_a);
4633a7c4
LW		 66}
67
76e3520e 68STATIC OP *
cea2e8a9 69S_no_fh_allowed(pTHX_ OP *o)
79072805 70{
cea2e8a9 71 yyerror(Perl_form(aTHX_ "Missing comma after first argument to %s function",
22c35a8c 72 PL_op_desc[o->op_type]));
11343788 73 return o;
79072805
LW		 74}
75
76e3520e 76STATIC OP *
cea2e8a9 77S_too_few_arguments(pTHX_ OP *o, char *name)
79072805 78{
cea2e8a9 79 yyerror(Perl_form(aTHX_ "Not enough arguments for %s", name));
11343788 80 return o;
79072805
LW		 81}
82
76e3520e 83STATIC OP *
cea2e8a9 84S_too_many_arguments(pTHX_ OP *o, char *name)
79072805 85{
cea2e8a9 86 yyerror(Perl_form(aTHX_ "Too many arguments for %s", name));
11343788 87 return o;
79072805
LW		 88}
89
76e3520e 90STATIC void
cea2e8a9 91S_bad_type(pTHX_ I32 n, char *t, char *name, OP *kid)
8990e307 92{
cea2e8a9 93 yyerror(Perl_form(aTHX_ "Type of arg %d to %s must be %s (not %s)",
22c35a8c 94 (int)n, name, t, PL_op_desc[kid->op_type]));
8990e307
LW		 95}
96
7a52d87a 97STATIC void
cea2e8a9 98S_no_bareword_allowed(pTHX_ OP *o)
7a52d87a 99{
5a844595
GS		 100 qerror(Perl_mess(aTHX_
101 "Bareword \"%s\" not allowed while \"strict subs\" in use",
102 SvPV_nolen(cSVOPo->op_sv)));
7a52d87a
GS		 103}
104
79072805
LW		 105/* "register" allocation */
106
107PADOFFSET
864dbfa3 108Perl_pad_allocmy(pTHX_ char *name)
93a17b20 109{
11343788 110 dTHR;
a0d0e21e
LW		 111 PADOFFSET off;
112 SV *sv;
113
834a4ddd 114 if (!(
77ca0c92 115 PL_in_my == KEY_our ||
834a4ddd
LW		 116 isALPHA(name[1]) ||
117 (PL_hints & HINT_UTF8 && (name[1] & 0xc0) == 0xc0) ||
77ca0c92 118 name[1] == '_' && (int)strlen(name) > 2 ))
834a4ddd 119 {
c4d0567e 120 if (!isPRINT(name[1]) || strchr("\t\n\r\f", name[1])) {
2b92dfce
GS		 121 /* 1999-02-27 mjd@plover.com */
122 char *p;
123 p = strchr(name, '\0');
124 /* The next block assumes the buffer is at least 205 chars
125 long. At present, it's always at least 256 chars. */
126 if (p-name > 200) {
127 strcpy(name+200, "...");
128 p = name+199;
129 }
130 else {
131 p[1] = '\0';
132 }
133 /* Move everything else down one character */
134 for (; p-name > 2; p--)
135 *p = *(p-1);
46fc3d4c 136 name[2] = toCTRL(name[1]);
137 name[1] = '^';
138 }
cea2e8a9 139 yyerror(Perl_form(aTHX_ "Can't use global %s in \"my\"",name));
a0d0e21e 140 }
599cee73 141 if (ckWARN(WARN_UNSAFE) && AvFILLp(PL_comppad_name) >= 0) {
3280af22
NIS		 142 SV **svp = AvARRAY(PL_comppad_name);
143 for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_floor; off--) {
b1cb66bf 144 if ((sv = svp[off])
3280af22 145 && sv != &PL_sv_undef
c53d7c7d 146 && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
b1cb66bf 147 && strEQ(name, SvPVX(sv)))
148 {
cea2e8a9 149 Perl_warner(aTHX_ WARN_UNSAFE,
77ca0c92
LW		 150 "\"%s\" variable %s masks earlier declaration in same %s",
151 (PL_in_my == KEY_our ? "our" : "my"),
152 name,
153 (SvIVX(sv) == PAD_MAX ? "scope" : "statement"));
b1cb66bf 154 break;
155 }
156 }
157 }
a0d0e21e
LW		 158 off = pad_alloc(OP_PADSV, SVs_PADMY);
159 sv = NEWSV(1102,0);
93a17b20
LW		 160 sv_upgrade(sv, SVt_PVNV);
161 sv_setpv(sv, name);
3280af22 162 if (PL_in_my_stash) {
c750a3ec 163 if (*name != '$')
cea2e8a9 164 yyerror(Perl_form(aTHX_ "Can't declare class for non-scalar %s in \"my\"",
dce40276 165 name));
c750a3ec
MB		 166 SvOBJECT_on(sv);
167 (void)SvUPGRADE(sv, SVt_PVMG);
3280af22
NIS		 168 SvSTASH(sv) = (HV*)SvREFCNT_inc(PL_in_my_stash);
169 PL_sv_objcount++;
c750a3ec 170 }
77ca0c92
LW		 171 if (PL_in_my == KEY_our)
172 SvFLAGS(sv) |= SVpad_OUR;
3280af22 173 av_store(PL_comppad_name, off, sv);
65202027 174 SvNVX(sv) = (NV)PAD_MAX;
8990e307 175 SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
3280af22
NIS		 176 if (!PL_min_intro_pending)
177 PL_min_intro_pending = off;
178 PL_max_intro_pending = off;
93a17b20 179 if (*name == '@')
3280af22 180 av_store(PL_comppad, off, (SV*)newAV());
93a17b20 181 else if (*name == '%')
3280af22
NIS		 182 av_store(PL_comppad, off, (SV*)newHV());
183 SvPADMY_on(PL_curpad[off]);
93a17b20
LW		 184 return off;
185}
186
2680586e
GS		 187#define FINDLEX_NOSEARCH 1 /* don't search outer contexts */
188
76e3520e 189STATIC PADOFFSET
cea2e8a9 190S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, U32 seq, CV* startcv,
864dbfa3 191 I32 cx_ix, I32 saweval, U32 flags)
93a17b20 192{
11343788 193 dTHR;
748a9306 194 CV *cv;
93a17b20
LW		 195 I32 off;
196 SV *sv;
93a17b20 197 register I32 i;
c09156bb 198 register PERL_CONTEXT *cx;
93a17b20 199
748a9306 200 for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
4fdae800 201 AV *curlist = CvPADLIST(cv);
202 SV **svp = av_fetch(curlist, 0, FALSE);
748a9306 203 AV *curname;
4fdae800 204
3280af22 205 if (!svp || *svp == &PL_sv_undef)
4633a7c4 206 continue;
748a9306
LW		 207 curname = (AV*)*svp;
208 svp = AvARRAY(curname);
93965878 209 for (off = AvFILLp(curname); off > 0; off--) {
748a9306 210 if ((sv = svp[off]) &&
3280af22 211 sv != &PL_sv_undef &&
748a9306 212 seq <= SvIVX(sv) &&
13826f2c 213 seq > I_32(SvNVX(sv)) &&
748a9306
LW		 214 strEQ(SvPVX(sv), name))
215 {
5f05dabc 216 I32 depth;
217 AV *oldpad;
218 SV *oldsv;
219
220 depth = CvDEPTH(cv);
221 if (!depth) {
9607fc9c 222 if (newoff) {
223 if (SvFAKE(sv))
224 continue;
4fdae800 225 return 0; /* don't clone from inactive stack frame */
9607fc9c 226 }
5f05dabc 227 depth = 1;
228 }
229 oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
230 oldsv = *av_fetch(oldpad, off, TRUE);
748a9306 231 if (!newoff) { /* Not a mere clone operation. */
9607fc9c 232 SV *namesv = NEWSV(1103,0);
748a9306 233 newoff = pad_alloc(OP_PADSV, SVs_PADMY);
9607fc9c 234 sv_upgrade(namesv, SVt_PVNV);
235 sv_setpv(namesv, name);
3280af22 236 av_store(PL_comppad_name, newoff, namesv);
65202027 237 SvNVX(namesv) = (NV)PL_curcop->cop_seq;
c53d7c7d 238 SvIVX(namesv) = PAD_MAX; /* A ref, intro immediately */
9607fc9c 239 SvFAKE_on(namesv); /* A ref, not a real var */
77ca0c92
LW		 240 if (SvFLAGS(sv) & SVpad_OUR)/* An "our" variable */
241 SvFLAGS(namesv) |= SVpad_OUR;
87671ffc 242 if (SvOBJECT(sv)) { /* A typed var */
3d93dc8b
GS		 243 SvOBJECT_on(namesv);
244 (void)SvUPGRADE(namesv, SVt_PVMG);
87671ffc 245 SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*)SvSTASH(sv));
3d93dc8b
GS		 246 PL_sv_objcount++;
247 }
3280af22 248 if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) {
28757baa 249 /* "It's closures all the way down." */
3280af22 250 CvCLONE_on(PL_compcv);
54310121 251 if (cv == startcv) {
3280af22 252 if (CvANON(PL_compcv))
54310121 253 oldsv = Nullsv; /* no need to keep ref */
254 }
255 else {
28757baa 256 CV *bcv;
257 for (bcv = startcv;
258 bcv && bcv != cv && !CvCLONE(bcv);
6b35e009
GS		 259 bcv = CvOUTSIDE(bcv))
260 {
28757baa 261 if (CvANON(bcv))
262 CvCLONE_on(bcv);
263 else {
6b35e009
GS		 264 if (ckWARN(WARN_CLOSURE)
265 && !CvUNIQUE(bcv) && !CvUNIQUE(cv))
266 {
cea2e8a9 267 Perl_warner(aTHX_ WARN_CLOSURE,
44a8e56a 268 "Variable \"%s\" may be unavailable",
28757baa 269 name);
6b35e009 270 }
28757baa 271 break;
272 }
273 }
274 }
275 }
3280af22 276 else if (!CvUNIQUE(PL_compcv)) {
599cee73 277 if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv))
cea2e8a9 278 Perl_warner(aTHX_ WARN_CLOSURE,
599cee73 279 "Variable \"%s\" will not stay shared", name);
5f05dabc 280 }
748a9306 281 }
3280af22 282 av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv));
748a9306
LW		 283 return newoff;
284 }
93a17b20
LW		 285 }
286 }
287
2680586e
GS		 288 if (flags & FINDLEX_NOSEARCH)
289 return 0;
290
93a17b20
LW		 291 /* Nothing in current lexical context--try eval's context, if any.
292 * This is necessary to let the perldb get at lexically scoped variables.
293 * XXX This will also probably interact badly with eval tree caching.
294 */
295
748a9306 296 for (i = cx_ix; i >= 0; i--) {
93a17b20 297 cx = &cxstack[i];
6b35e009 298 switch (CxTYPE(cx)) {
93a17b20 299 default:
748a9306
LW		 300 if (i == 0 && saweval) {
301 seq = cxstack[saweval].blk_oldcop->cop_seq;
2680586e 302 return pad_findlex(name, newoff, seq, PL_main_cv, -1, saweval, 0);
748a9306 303 }
93a17b20
LW		 304 break;
305 case CXt_EVAL:
44a8e56a 306 switch (cx->blk_eval.old_op_type) {
307 case OP_ENTEREVAL:
6b35e009
GS		 308 if (CxREALEVAL(cx))
309 saweval = i;
44a8e56a 310 break;
311 case OP_REQUIRE:
312 /* require must have its own scope */
313 return 0;
314 }
93a17b20
LW		 315 break;
316 case CXt_SUB:
317 if (!saweval)
318 return 0;
319 cv = cx->blk_sub.cv;
3280af22 320 if (PL_debstash && CvSTASH(cv) == PL_debstash) { /* ignore DB'* scope */
748a9306 321 saweval = i; /* so we know where we were called from */
93a17b20 322 continue;
93a17b20 323 }
748a9306 324 seq = cxstack[saweval].blk_oldcop->cop_seq;
2680586e 325 return pad_findlex(name, newoff, seq, cv, i-1, saweval,FINDLEX_NOSEARCH);
93a17b20
LW		 326 }
327 }
328
748a9306
LW		 329 return 0;
330}
a0d0e21e 331
748a9306 332PADOFFSET
864dbfa3 333Perl_pad_findmy(pTHX_ char *name)
748a9306 334{
11343788 335 dTHR;
748a9306 336 I32 off;
54310121 337 I32 pendoff = 0;
748a9306 338 SV *sv;
3280af22
NIS		 339 SV **svp = AvARRAY(PL_comppad_name);
340 U32 seq = PL_cop_seqmax;
6b35e009 341 PERL_CONTEXT *cx;
33b8ce05 342 CV *outside;
748a9306 343
11343788
MB		 344#ifdef USE_THREADS
345 /*
346 * Special case to get lexical (and hence per-thread) @_.
347 * XXX I need to find out how to tell at parse-time whether use
348 * of @_ should refer to a lexical (from a sub) or defgv (global
349 * scope and maybe weird sub-ish things like formats). See
350 * startsub in perly.y. It's possible that @_ could be lexical
351 * (at least from subs) even in non-threaded perl.
352 */
353 if (strEQ(name, "@_"))
354 return 0; /* success. (NOT_IN_PAD indicates failure) */
355#endif /* USE_THREADS */
356
748a9306 357 /* The one we're looking for is probably just before comppad_name_fill. */
3280af22 358 for (off = AvFILLp(PL_comppad_name); off > 0; off--) {
a0d0e21e 359 if ((sv = svp[off]) &&
3280af22 360 sv != &PL_sv_undef &&
54310121 361 (!SvIVX(sv) ||
362 (seq <= SvIVX(sv) &&
363 seq > I_32(SvNVX(sv)))) &&
a0d0e21e
LW		 364 strEQ(SvPVX(sv), name))
365 {
77ca0c92 366 if (SvIVX(sv) || SvFLAGS(sv) & SVpad_OUR)
54310121 367 return (PADOFFSET)off;
368 pendoff = off; /* this pending def. will override import */
a0d0e21e
LW		 369 }
370 }
748a9306 371
33b8ce05
GS		 372 outside = CvOUTSIDE(PL_compcv);
373
374 /* Check if if we're compiling an eval'', and adjust seq to be the
375 * eval's seq number. This depends on eval'' having a non-null
376 * CvOUTSIDE() while it is being compiled. The eval'' itself is
1aff0e91
GS		 377 * identified by CvEVAL being true and CvGV being null. */
378 if (outside && CvEVAL(PL_compcv) && !CvGV(PL_compcv) && cxstack_ix >= 0) {
6b35e009
GS		 379 cx = &cxstack[cxstack_ix];
380 if (CxREALEVAL(cx))
381 seq = cx->blk_oldcop->cop_seq;
382 }
383
748a9306 384 /* See if it's in a nested scope */
2680586e 385 off = pad_findlex(name, 0, seq, outside, cxstack_ix, 0, 0);
54310121 386 if (off) {
387 /* If there is a pending local definition, this new alias must die */
388 if (pendoff)
3280af22 389 SvIVX(AvARRAY(PL_comppad_name)[off]) = seq;
11343788 390 return off; /* pad_findlex returns 0 for failure...*/
54310121 391 }
11343788 392 return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */
93a17b20
LW		 393}
394
395void
864dbfa3 396Perl_pad_leavemy(pTHX_ I32 fill)
93a17b20 397{
0453d815 398 dTHR;
93a17b20 399 I32 off;
3280af22 400 SV **svp = AvARRAY(PL_comppad_name);
93a17b20 401 SV *sv;
3280af22
NIS		 402 if (PL_min_intro_pending && fill < PL_min_intro_pending) {
403 for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
0453d815
PM		 404 if ((sv = svp[off]) && sv != &PL_sv_undef && ckWARN_d(WARN_INTERNAL))
405 Perl_warner(aTHX_ WARN_INTERNAL, "%s never introduced", SvPVX(sv));
8990e307
LW		 406 }
407 }
408 /* "Deintroduce" my variables that are leaving with this scope. */
3280af22 409 for (off = AvFILLp(PL_comppad_name); off > fill; off--) {
c53d7c7d 410 if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == PAD_MAX)
3280af22 411 SvIVX(sv) = PL_cop_seqmax;
93a17b20
LW		 412 }
413}
414
415PADOFFSET
864dbfa3 416Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype)
79072805 417{
11343788 418 dTHR;
79072805
LW		 419 SV *sv;
420 I32 retval;
421
3280af22 422 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 423 Perl_croak(aTHX_ "panic: pad_alloc");
3280af22 424 if (PL_pad_reset_pending)
a0d0e21e 425 pad_reset();
ed6116ce 426 if (tmptype & SVs_PADMY) {
79072805 427 do {
3280af22 428 sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
ed6116ce 429 } while (SvPADBUSY(sv)); /* need a fresh one */
3280af22 430 retval = AvFILLp(PL_comppad);
79072805
LW		 431 }
432 else {
3280af22
NIS		 433 SV **names = AvARRAY(PL_comppad_name);
434 SSize_t names_fill = AvFILLp(PL_comppad_name);
bbce6d69 435 for (;;) {
436 /*
437 * "foreach" index vars temporarily become aliases to non-"my"
438 * values. Thus we must skip, not just pad values that are
439 * marked as current pad values, but also those with names.
440 */
3280af22
NIS		 441 if (++PL_padix <= names_fill &&
442 (sv = names[PL_padix]) && sv != &PL_sv_undef)
bbce6d69 443 continue;
3280af22 444 sv = *av_fetch(PL_comppad, PL_padix, TRUE);
bbce6d69 445 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
446 break;
447 }
3280af22 448 retval = PL_padix;
79072805 449 }
8990e307 450 SvFLAGS(sv) |= tmptype;
3280af22 451 PL_curpad = AvARRAY(PL_comppad);
11343788 452#ifdef USE_THREADS
5dc0d613 453 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
533c011a 454 (unsigned long) thr, (unsigned long) PL_curpad,
22c35a8c 455 (long) retval, PL_op_name[optype]));
11343788 456#else
d9bb4600 457 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx alloc %ld for %s\n",
3280af22 458 (unsigned long) PL_curpad,
22c35a8c 459 (long) retval, PL_op_name[optype]));
11343788 460#endif /* USE_THREADS */
79072805
LW		 461 return (PADOFFSET)retval;
462}
463
464SV *
864dbfa3 465Perl_pad_sv(pTHX_ PADOFFSET po)
79072805 466{
11343788
MB		 467 dTHR;
468#ifdef USE_THREADS
5dc0d613 469 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
533c011a 470 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 471#else
79072805 472 if (!po)
cea2e8a9 473 Perl_croak(aTHX_ "panic: pad_sv po");
d9bb4600 474 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx sv %d\n",
3280af22 475 (unsigned long) PL_curpad, po));
11343788 476#endif /* USE_THREADS */
3280af22 477 return PL_curpad[po]; /* eventually we'll turn this into a macro */
79072805
LW		 478}
479
480void
864dbfa3 481Perl_pad_free(pTHX_ PADOFFSET po)
79072805 482{
11343788 483 dTHR;
3280af22 484 if (!PL_curpad)
a0d0e21e 485 return;
3280af22 486 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 487 Perl_croak(aTHX_ "panic: pad_free curpad");
79072805 488 if (!po)
cea2e8a9 489 Perl_croak(aTHX_ "panic: pad_free po");
11343788 490#ifdef USE_THREADS
5dc0d613 491 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
533c011a 492 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 493#else
d9bb4600 494 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx free %d\n",
3280af22 495 (unsigned long) PL_curpad, po));
11343788 496#endif /* USE_THREADS */
3280af22
NIS		 497 if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef)
498 SvPADTMP_off(PL_curpad[po]);
499 if ((I32)po < PL_padix)
500 PL_padix = po - 1;
79072805
LW		 501}
502
503void
864dbfa3 504Perl_pad_swipe(pTHX_ PADOFFSET po)
79072805 505{
11343788 506 dTHR;
3280af22 507 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 508 Perl_croak(aTHX_ "panic: pad_swipe curpad");
79072805 509 if (!po)
cea2e8a9 510 Perl_croak(aTHX_ "panic: pad_swipe po");
11343788 511#ifdef USE_THREADS
5dc0d613 512 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
533c011a 513 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 514#else
d9bb4600 515 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx swipe %d\n",
3280af22 516 (unsigned long) PL_curpad, po));
11343788 517#endif /* USE_THREADS */
3280af22
NIS		 518 SvPADTMP_off(PL_curpad[po]);
519 PL_curpad[po] = NEWSV(1107,0);
520 SvPADTMP_on(PL_curpad[po]);
521 if ((I32)po < PL_padix)
522 PL_padix = po - 1;
79072805
LW		 523}
524
d9bb4600
GS		 525/* XXX pad_reset() is currently disabled because it results in serious bugs.
526 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
527 * on the stack by OPs that use them, there are several ways to get an alias
528 * to a shared TARG. Such an alias will change randomly and unpredictably.
529 * We avoid doing this until we can think of a Better Way.
530 * GSAR 97-10-29 */
79072805 531void
864dbfa3 532Perl_pad_reset(pTHX)
79072805 533{
d9bb4600 534#ifdef USE_BROKEN_PAD_RESET
11343788 535 dTHR;
79072805
LW		 536 register I32 po;
537
6b88bc9c 538 if (AvARRAY(PL_comppad) != PL_curpad)
cea2e8a9 539 Perl_croak(aTHX_ "panic: pad_reset curpad");
11343788 540#ifdef USE_THREADS
5dc0d613 541 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
6b88bc9c 542 (unsigned long) thr, (unsigned long) PL_curpad));
11343788 543#else
d9bb4600 544 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx reset\n",
6b88bc9c 545 (unsigned long) PL_curpad));
11343788 546#endif /* USE_THREADS */
6b88bc9c
GS		 547 if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */
548 for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
549 if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
550 SvPADTMP_off(PL_curpad[po]);
748a9306 551 }
6b88bc9c 552 PL_padix = PL_padix_floor;
79072805 553 }
d9bb4600 554#endif
3280af22 555 PL_pad_reset_pending = FALSE;
79072805
LW		 556}
557
a863c7d1 558#ifdef USE_THREADS
54b9620d 559/* find_threadsv is not reentrant */
a863c7d1 560PADOFFSET
864dbfa3 561Perl_find_threadsv(pTHX_ const char *name)
a863c7d1
MB		 562{
563 dTHR;
564 char *p;
565 PADOFFSET key;
554b3eca 566 SV **svp;
54b9620d 567 /* We currently only handle names of a single character */
533c011a 568 p = strchr(PL_threadsv_names, *name);
a863c7d1
MB		 569 if (!p)
570 return NOT_IN_PAD;
533c011a 571 key = p - PL_threadsv_names;
2d8e6c8d 572 MUTEX_LOCK(&thr->mutex);
54b9620d 573 svp = av_fetch(thr->threadsv, key, FALSE);
2d8e6c8d
GS		 574 if (svp)
575 MUTEX_UNLOCK(&thr->mutex);
576 else {
554b3eca 577 SV *sv = NEWSV(0, 0);
54b9620d 578 av_store(thr->threadsv, key, sv);
940cb80d 579 thr->threadsvp = AvARRAY(thr->threadsv);
2d8e6c8d 580 MUTEX_UNLOCK(&thr->mutex);
554b3eca
MB		 581 /*
582 * Some magic variables used to be automagically initialised
583 * in gv_fetchpv. Those which are now per-thread magicals get
584 * initialised here instead.
585 */
586 switch (*name) {
54b9620d
MB		 587 case '_':
588 break;
554b3eca
MB		 589 case ';':
590 sv_setpv(sv, "\034");
54b9620d 591 sv_magic(sv, 0, 0, name, 1);
554b3eca 592 break;
c277df42
IZ		 593 case '&':
594 case '`':
595 case '\'':
533c011a 596 PL_sawampersand = TRUE;
a3f914c5
GS		 597 /* FALL THROUGH */
598 case '1':
599 case '2':
600 case '3':
601 case '4':
602 case '5':
603 case '6':
604 case '7':
605 case '8':
606 case '9':
c277df42 607 SvREADONLY_on(sv);
d8b5173a 608 /* FALL THROUGH */
067391ea
GS		 609
610 /* XXX %! tied to Errno.pm needs to be added here.
611 * See gv_fetchpv(). */
612 /* case '!': */
613
54b9620d
MB		 614 default:
615 sv_magic(sv, 0, 0, name, 1);
554b3eca 616 }
8b73bbec 617 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
54b9620d 618 "find_threadsv: new SV %p for $%s%c\n",
554b3eca
MB		 619 sv, (*name < 32) ? "^" : "",
620 (*name < 32) ? toCTRL(*name) : *name));
a863c7d1
MB		 621 }
622 return key;
623}
624#endif /* USE_THREADS */
625
79072805
LW		 626/* Destructor */
627
628void
864dbfa3 629Perl_op_free(pTHX_ OP *o)
79072805 630{
85e6fe83 631 register OP *kid, *nextkid;
acb36ea4 632 OPCODE type;
79072805 633
5dc0d613 634 if (!o || o->op_seq == (U16)-1)
79072805
LW		 635 return;
636
11343788
MB		 637 if (o->op_flags & OPf_KIDS) {
638 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 639 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 640 op_free(kid);
85e6fe83 641 }
79072805 642 }
acb36ea4
GS		 643 type = o->op_type;
644 if (type == OP_NULL)
645 type = o->op_targ;
646
647 /* COP* is not cleared by op_clear() so that we may track line
648 * numbers etc even after null() */
649 if (type == OP_NEXTSTATE || type == OP_SETSTATE || type == OP_DBSTATE)
650 cop_free((COP*)o);
651
652 op_clear(o);
653
654#ifdef PL_OP_SLAB_ALLOC
655 if ((char *) o == PL_OpPtr)
656 {
657 }
658#else
659 Safefree(o);
660#endif
661}
79072805 662
acb36ea4
GS		 663STATIC void
664S_op_clear(pTHX_ OP *o)
665{
11343788 666 switch (o->op_type) {
acb36ea4
GS		 667 case OP_NULL: /* Was holding old type, if any. */
668 case OP_ENTEREVAL: /* Was holding hints. */
669#ifdef USE_THREADS
670 case OP_THREADSV: /* Was holding index into thr->threadsv AV. */
671#endif
672 o->op_targ = 0;
a0d0e21e 673 break;
554b3eca 674#ifdef USE_THREADS
8dd3ba40
SM		 675 case OP_ENTERITER:
676 if (!(o->op_flags & OPf_SPECIAL))
677 break;
678 /* FALL THROUGH */
554b3eca 679#endif /* USE_THREADS */
a6006777 680 default:
ac4c12e7 681 if (!(o->op_flags & OPf_REF)
0b94c7bb 682 || (PL_check[o->op_type] != MEMBER_TO_FPTR(Perl_ck_ftst)))
a6006777 683 break;
684 /* FALL THROUGH */
463ee0b2 685 case OP_GVSV:
79072805 686 case OP_GV:
a6006777 687 case OP_AELEMFAST:
11343788 688 SvREFCNT_dec(cGVOPo->op_gv);
acb36ea4 689 cGVOPo->op_gv = Nullgv;
79072805
LW		 690 break;
691 case OP_CONST:
11343788 692 SvREFCNT_dec(cSVOPo->op_sv);
acb36ea4 693 cSVOPo->op_sv = Nullsv;
79072805 694 break;
748a9306
LW		 695 case OP_GOTO:
696 case OP_NEXT:
697 case OP_LAST:
698 case OP_REDO:
11343788 699 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 700 break;
701 /* FALL THROUGH */
a0d0e21e 702 case OP_TRANS:
acb36ea4 703 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
a0ed51b3 704 SvREFCNT_dec(cSVOPo->op_sv);
acb36ea4
GS		 705 cSVOPo->op_sv = Nullsv;
706 }
707 else {
a0ed51b3 708 Safefree(cPVOPo->op_pv);
acb36ea4
GS		 709 cPVOPo->op_pv = Nullch;
710 }
a0d0e21e
LW		 711 break;
712 case OP_SUBST:
11343788 713 op_free(cPMOPo->op_pmreplroot);
acb36ea4 714 cPMOPo->op_pmreplroot = Nullop;
a0d0e21e 715 /* FALL THROUGH */
748a9306 716 case OP_PUSHRE:
a0d0e21e 717 case OP_MATCH:
8782bef2 718 case OP_QR:
c277df42 719 ReREFCNT_dec(cPMOPo->op_pmregexp);
acb36ea4 720 cPMOPo->op_pmregexp = (REGEXP*)NULL;
a0d0e21e 721 break;
79072805
LW		 722 }
723
11343788
MB		 724 if (o->op_targ > 0)
725 pad_free(o->op_targ);
79072805
LW		 726}
727
76e3520e 728STATIC void
3eb57f73
HS		 729S_cop_free(pTHX_ COP* cop)
730{
731 Safefree(cop->cop_label);
732 SvREFCNT_dec(cop->cop_filegv);
0453d815 733 if (! specialWARN(cop->cop_warnings))
3eb57f73
HS		 734 SvREFCNT_dec(cop->cop_warnings);
735}
736
737STATIC void
cea2e8a9 738S_null(pTHX_ OP *o)
8990e307 739{
acb36ea4
GS		 740 if (o->op_type == OP_NULL)
741 return;
742 op_clear(o);
11343788
MB		 743 o->op_targ = o->op_type;
744 o->op_type = OP_NULL;
22c35a8c 745 o->op_ppaddr = PL_ppaddr[OP_NULL];
8990e307
LW		 746}
747
79072805
LW		 748/* Contextualizers */
749
463ee0b2 750#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 751
752OP *
864dbfa3 753Perl_linklist(pTHX_ OP *o)
79072805
LW		 754{
755 register OP *kid;
756
11343788
MB		 757 if (o->op_next)
758 return o->op_next;
79072805
LW		 759
760 /* establish postfix order */
11343788
MB		 761 if (cUNOPo->op_first) {
762 o->op_next = LINKLIST(cUNOPo->op_first);
763 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 764 if (kid->op_sibling)
765 kid->op_next = LINKLIST(kid->op_sibling);
766 else
11343788 767 kid->op_next = o;
79072805
LW		 768 }
769 }
770 else
11343788 771 o->op_next = o;
79072805 772
11343788 773 return o->op_next;
79072805
LW		 774}
775
776OP *
864dbfa3 777Perl_scalarkids(pTHX_ OP *o)
79072805
LW		 778{
779 OP *kid;
11343788
MB		 780 if (o && o->op_flags & OPf_KIDS) {
781 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 782 scalar(kid);
783 }
11343788 784 return o;
79072805
LW		 785}
786
76e3520e 787STATIC OP *
cea2e8a9 788S_scalarboolean(pTHX_ OP *o)
8990e307 789{
d008e5eb 790 if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
0f15f207 791 dTHR;
d008e5eb
GS		 792 if (ckWARN(WARN_SYNTAX)) {
793 line_t oldline = PL_curcop->cop_line;
a0d0e21e 794
d008e5eb
GS		 795 if (PL_copline != NOLINE)
796 PL_curcop->cop_line = PL_copline;
cea2e8a9 797 Perl_warner(aTHX_ WARN_SYNTAX, "Found = in conditional, should be ==");
d008e5eb
GS		 798 PL_curcop->cop_line = oldline;
799 }
a0d0e21e 800 }
11343788 801 return scalar(o);
8990e307
LW		 802}
803
804OP *
864dbfa3 805Perl_scalar(pTHX_ OP *o)
79072805
LW		 806{
807 OP *kid;
808
a0d0e21e 809 /* assumes no premature commitment */
3280af22 810 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 811 || o->op_type == OP_RETURN)
11343788 812 return o;
79072805 813
b162f9ea
IZ		 814 if ((o->op_private & OPpTARGET_MY)
815 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
816 return scalar(o); /* As if inside SASSIGN */
817
5dc0d613 818 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 819
11343788 820 switch (o->op_type) {
79072805 821 case OP_REPEAT:
11343788
MB		 822 if (o->op_private & OPpREPEAT_DOLIST)
823 null(((LISTOP*)cBINOPo->op_first)->op_first);
824 scalar(cBINOPo->op_first);
8990e307 825 break;
79072805
LW		 826 case OP_OR:
827 case OP_AND:
828 case OP_COND_EXPR:
11343788 829 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 830 scalar(kid);
79072805 831 break;
a0d0e21e 832 case OP_SPLIT:
11343788 833 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 834 if (!kPMOP->op_pmreplroot)
835 deprecate("implicit split to @_");
836 }
837 /* FALL THROUGH */
79072805 838 case OP_MATCH:
8782bef2 839 case OP_QR:
79072805
LW		 840 case OP_SUBST:
841 case OP_NULL:
8990e307 842 default:
11343788
MB		 843 if (o->op_flags & OPf_KIDS) {
844 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 845 scalar(kid);
846 }
79072805
LW		 847 break;
848 case OP_LEAVE:
849 case OP_LEAVETRY:
5dc0d613 850 kid = cLISTOPo->op_first;
54310121 851 scalar(kid);
852 while (kid = kid->op_sibling) {
853 if (kid->op_sibling)
854 scalarvoid(kid);
855 else
856 scalar(kid);
857 }
3280af22 858 WITH_THR(PL_curcop = &PL_compiling);
54310121 859 break;
748a9306 860 case OP_SCOPE:
79072805 861 case OP_LINESEQ:
8990e307 862 case OP_LIST:
11343788 863 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 864 if (kid->op_sibling)
865 scalarvoid(kid);
866 else
867 scalar(kid);
868 }
3280af22 869 WITH_THR(PL_curcop = &PL_compiling);
79072805
LW		 870 break;
871 }
11343788 872 return o;
79072805
LW		 873}
874
875OP *
864dbfa3 876Perl_scalarvoid(pTHX_ OP *o)
79072805
LW		 877{
878 OP *kid;
8990e307
LW		 879 char* useless = 0;
880 SV* sv;
2ebea0a1
GS		 881 U8 want;
882
acb36ea4
GS		 883 if (o->op_type == OP_NEXTSTATE
884 || o->op_type == OP_SETSTATE
885 || o->op_type == OP_DBSTATE
886 || (o->op_type == OP_NULL && (o->op_targ == OP_NEXTSTATE
887 || o->op_targ == OP_SETSTATE
888 || o->op_targ == OP_DBSTATE)))
2ebea0a1
GS		 889 {
890 dTHR;
891 PL_curcop = (COP*)o; /* for warning below */
892 }
79072805 893
54310121 894 /* assumes no premature commitment */
2ebea0a1
GS		 895 want = o->op_flags & OPf_WANT;
896 if ((want && want != OPf_WANT_SCALAR) || PL_error_count
5dc0d613 897 || o->op_type == OP_RETURN)
11343788 898 return o;
79072805 899
b162f9ea
IZ		 900 if ((o->op_private & OPpTARGET_MY)
901 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
902 return scalar(o); /* As if inside SASSIGN */
903
5dc0d613 904 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 905
11343788 906 switch (o->op_type) {
79072805 907 default:
22c35a8c 908 if (!(PL_opargs[o->op_type] & OA_FOLDCONST))
8990e307 909 break;
36477c24 910 /* FALL THROUGH */
911 case OP_REPEAT:
11343788 912 if (o->op_flags & OPf_STACKED)
8990e307 913 break;
5d82c453
GA		 914 goto func_ops;
915 case OP_SUBSTR:
916 if (o->op_private == 4)
917 break;
8990e307
LW		 918 /* FALL THROUGH */
919 case OP_GVSV:
920 case OP_WANTARRAY:
921 case OP_GV:
922 case OP_PADSV:
923 case OP_PADAV:
924 case OP_PADHV:
925 case OP_PADANY:
926 case OP_AV2ARYLEN:
8990e307 927 case OP_REF:
a0d0e21e
LW		 928 case OP_REFGEN:
929 case OP_SREFGEN:
8990e307
LW		 930 case OP_DEFINED:
931 case OP_HEX:
932 case OP_OCT:
933 case OP_LENGTH:
8990e307
LW		 934 case OP_VEC:
935 case OP_INDEX:
936 case OP_RINDEX:
937 case OP_SPRINTF:
938 case OP_AELEM:
939 case OP_AELEMFAST:
940 case OP_ASLICE:
8990e307
LW		 941 case OP_HELEM:
942 case OP_HSLICE:
943 case OP_UNPACK:
944 case OP_PACK:
8990e307
LW		 945 case OP_JOIN:
946 case OP_LSLICE:
947 case OP_ANONLIST:
948 case OP_ANONHASH:
949 case OP_SORT:
950 case OP_REVERSE:
951 case OP_RANGE:
952 case OP_FLIP:
953 case OP_FLOP:
954 case OP_CALLER:
955 case OP_FILENO:
956 case OP_EOF:
957 case OP_TELL:
958 case OP_GETSOCKNAME:
959 case OP_GETPEERNAME:
960 case OP_READLINK:
961 case OP_TELLDIR:
962 case OP_GETPPID:
963 case OP_GETPGRP:
964 case OP_GETPRIORITY:
965 case OP_TIME:
966 case OP_TMS:
967 case OP_LOCALTIME:
968 case OP_GMTIME:
969 case OP_GHBYNAME:
970 case OP_GHBYADDR:
971 case OP_GHOSTENT:
972 case OP_GNBYNAME:
973 case OP_GNBYADDR:
974 case OP_GNETENT:
975 case OP_GPBYNAME:
976 case OP_GPBYNUMBER:
977 case OP_GPROTOENT:
978 case OP_GSBYNAME:
979 case OP_GSBYPORT:
980 case OP_GSERVENT:
981 case OP_GPWNAM:
982 case OP_GPWUID:
983 case OP_GGRNAM:
984 case OP_GGRGID:
985 case OP_GETLOGIN:
5d82c453 986 func_ops:
11343788 987 if (!(o->op_private & OPpLVAL_INTRO))
22c35a8c 988 useless = PL_op_desc[o->op_type];
8990e307
LW		 989 break;
990
991 case OP_RV2GV:
992 case OP_RV2SV:
993 case OP_RV2AV:
994 case OP_RV2HV:
11343788
MB		 995 if (!(o->op_private & OPpLVAL_INTRO) &&
996 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 997 useless = "a variable";
998 break;
79072805
LW		 999
1000 case OP_CONST:
11343788 1001 sv = cSVOPo->op_sv;
7a52d87a
GS		 1002 if (cSVOPo->op_private & OPpCONST_STRICT)
1003 no_bareword_allowed(o);
1004 else {
d008e5eb
GS		 1005 dTHR;
1006 if (ckWARN(WARN_VOID)) {
1007 useless = "a constant";
1008 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
1009 useless = 0;
1010 else if (SvPOK(sv)) {
1011 if (strnEQ(SvPVX(sv), "di", 2) ||
1012 strnEQ(SvPVX(sv), "ds", 2) ||
1013 strnEQ(SvPVX(sv), "ig", 2))
1014 useless = 0;
1015 }
8990e307
LW		 1016 }
1017 }
acb36ea4 1018 null(o); /* don't execute or even remember it */
79072805
LW		 1019 break;
1020
1021 case OP_POSTINC:
11343788 1022 o->op_type = OP_PREINC; /* pre-increment is faster */
22c35a8c 1023 o->op_ppaddr = PL_ppaddr[OP_PREINC];
79072805
LW		 1024 break;
1025
1026 case OP_POSTDEC:
11343788 1027 o->op_type = OP_PREDEC; /* pre-decrement is faster */
22c35a8c 1028 o->op_ppaddr = PL_ppaddr[OP_PREDEC];
79072805
LW		 1029 break;
1030
79072805
LW		 1031 case OP_OR:
1032 case OP_AND:
1033 case OP_COND_EXPR:
11343788 1034 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1035 scalarvoid(kid);
1036 break;
5aabfad6 1037
a0d0e21e 1038 case OP_NULL:
11343788 1039 if (o->op_flags & OPf_STACKED)
a0d0e21e 1040 break;
5aabfad6 1041 /* FALL THROUGH */
2ebea0a1
GS		 1042 case OP_NEXTSTATE:
1043 case OP_DBSTATE:
79072805
LW		 1044 case OP_ENTERTRY:
1045 case OP_ENTER:
1046 case OP_SCALAR:
11343788 1047 if (!(o->op_flags & OPf_KIDS))
79072805 1048 break;
54310121 1049 /* FALL THROUGH */
463ee0b2 1050 case OP_SCOPE:
79072805
LW		 1051 case OP_LEAVE:
1052 case OP_LEAVETRY:
a0d0e21e 1053 case OP_LEAVELOOP:
79072805 1054 case OP_LINESEQ:
79072805 1055 case OP_LIST:
11343788 1056 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 1057 scalarvoid(kid);
1058 break;
c90c0ff4 1059 case OP_ENTEREVAL:
5196be3e 1060 scalarkids(o);
c90c0ff4 1061 break;
5aabfad6 1062 case OP_REQUIRE:
c90c0ff4 1063 /* all requires must return a boolean value */
5196be3e
MB		 1064 o->op_flags &= ~OPf_WANT;
1065 return scalar(o);
a0d0e21e 1066 case OP_SPLIT:
11343788 1067 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 1068 if (!kPMOP->op_pmreplroot)
1069 deprecate("implicit split to @_");
1070 }
1071 break;
79072805 1072 }
d008e5eb
GS		 1073 if (useless) {
1074 dTHR;
1075 if (ckWARN(WARN_VOID))
cea2e8a9 1076 Perl_warner(aTHX_ WARN_VOID, "Useless use of %s in void context", useless);
d008e5eb 1077 }
11343788 1078 return o;
79072805
LW		 1079}
1080
1081OP *
864dbfa3 1082Perl_listkids(pTHX_ OP *o)
79072805
LW		 1083{
1084 OP *kid;
11343788
MB		 1085 if (o && o->op_flags & OPf_KIDS) {
1086 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 1087 list(kid);
1088 }
11343788 1089 return o;
79072805
LW		 1090}
1091
1092OP *
864dbfa3 1093Perl_list(pTHX_ OP *o)
79072805
LW		 1094{
1095 OP *kid;
1096
a0d0e21e 1097 /* assumes no premature commitment */
3280af22 1098 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 1099 || o->op_type == OP_RETURN)
11343788 1100 return o;
79072805 1101
b162f9ea
IZ		 1102 if ((o->op_private & OPpTARGET_MY)
1103 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
1104 return o; /* As if inside SASSIGN */
1105
5dc0d613 1106 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 1107
11343788 1108 switch (o->op_type) {
79072805
LW		 1109 case OP_FLOP:
1110 case OP_REPEAT:
11343788 1111 list(cBINOPo->op_first);
79072805
LW		 1112 break;
1113 case OP_OR:
1114 case OP_AND:
1115 case OP_COND_EXPR:
11343788 1116 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1117 list(kid);
1118 break;
1119 default:
1120 case OP_MATCH:
8782bef2 1121 case OP_QR:
79072805
LW		 1122 case OP_SUBST:
1123 case OP_NULL:
11343788 1124 if (!(o->op_flags & OPf_KIDS))
79072805 1125 break;
11343788
MB		 1126 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
1127 list(cBINOPo->op_first);
1128 return gen_constant_list(o);
79072805
LW		 1129 }
1130 case OP_LIST:
11343788 1131 listkids(o);
79072805
LW		 1132 break;
1133 case OP_LEAVE:
1134 case OP_LEAVETRY:
5dc0d613 1135 kid = cLISTOPo->op_first;
54310121 1136 list(kid);
1137 while (kid = kid->op_sibling) {
1138 if (kid->op_sibling)
1139 scalarvoid(kid);
1140 else
1141 list(kid);
1142 }
3280af22 1143 WITH_THR(PL_curcop = &PL_compiling);
54310121 1144 break;
748a9306 1145 case OP_SCOPE:
79072805 1146 case OP_LINESEQ:
11343788 1147 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 1148 if (kid->op_sibling)
1149 scalarvoid(kid);
1150 else
1151 list(kid);
1152 }
3280af22 1153 WITH_THR(PL_curcop = &PL_compiling);
79072805 1154 break;
c90c0ff4 1155 case OP_REQUIRE:
1156 /* all requires must return a boolean value */
5196be3e
MB		 1157 o->op_flags &= ~OPf_WANT;
1158 return scalar(o);
79072805 1159 }
11343788 1160 return o;
79072805
LW		 1161}
1162
1163OP *
864dbfa3 1164Perl_scalarseq(pTHX_ OP *o)
79072805
LW		 1165{
1166 OP *kid;
1167
11343788
MB		 1168 if (o) {
1169 if (o->op_type == OP_LINESEQ ||
1170 o->op_type == OP_SCOPE ||
1171 o->op_type == OP_LEAVE ||
1172 o->op_type == OP_LEAVETRY)
463ee0b2 1173 {
0f15f207 1174 dTHR;
11343788 1175 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1176 if (kid->op_sibling) {
463ee0b2 1177 scalarvoid(kid);
ed6116ce 1178 }
463ee0b2 1179 }
3280af22 1180 PL_curcop = &PL_compiling;
79072805 1181 }
11343788 1182 o->op_flags &= ~OPf_PARENS;
3280af22 1183 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 1184 o->op_flags |= OPf_PARENS;
79072805 1185 }
8990e307 1186 else
11343788
MB		 1187 o = newOP(OP_STUB, 0);
1188 return o;
79072805
LW		 1189}
1190
76e3520e 1191STATIC OP *
cea2e8a9 1192S_modkids(pTHX_ OP *o, I32 type)
79072805
LW		 1193{
1194 OP *kid;
11343788
MB		 1195 if (o && o->op_flags & OPf_KIDS) {
1196 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1197 mod(kid, type);
79072805 1198 }
11343788 1199 return o;
79072805
LW		 1200}
1201
79072805 1202OP *
864dbfa3 1203Perl_mod(pTHX_ OP *o, I32 type)
79072805 1204{
11343788 1205 dTHR;
79072805
LW		 1206 OP *kid;
1207 SV *sv;
2d8e6c8d 1208 STRLEN n_a;
79072805 1209
3280af22 1210 if (!o || PL_error_count)
11343788 1211 return o;
79072805 1212
b162f9ea
IZ		 1213 if ((o->op_private & OPpTARGET_MY)
1214 && (PL_opargs[o->op_type] & OA_TARGLEX)) /* OPp share the meaning */
1215 return o;
1216
11343788 1217 switch (o->op_type) {
68dc0745 1218 case OP_UNDEF:
3280af22 1219 PL_modcount++;
5dc0d613 1220 return o;
a0d0e21e 1221 case OP_CONST:
11343788 1222 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e 1223 goto nomod;
3280af22
NIS		 1224 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
1225 PL_compiling.cop_arybase = (I32)SvIV(((SVOP*)PL_eval_start)->op_sv);
1226 PL_eval_start = 0;
a0d0e21e
LW		 1227 }
1228 else if (!type) {
3280af22
NIS		 1229 SAVEI32(PL_compiling.cop_arybase);
1230 PL_compiling.cop_arybase = 0;
a0d0e21e
LW		 1231 }
1232 else if (type == OP_REFGEN)
1233 goto nomod;
1234 else
cea2e8a9 1235 Perl_croak(aTHX_ "That use of $[ is unsupported");
a0d0e21e 1236 break;
5f05dabc 1237 case OP_STUB:
5196be3e 1238 if (o->op_flags & OPf_PARENS)
5f05dabc 1239 break;
1240 goto nomod;
a0d0e21e
LW		 1241 case OP_ENTERSUB:
1242 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1243 !(o->op_flags & OPf_STACKED)) {
1244 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1245 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1246 assert(cUNOPo->op_first->op_type == OP_NULL);
1247 null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1248 break;
1249 }
cd06dffe
GS		 1250 else { /* lvalue subroutine call */
1251 o->op_private |= OPpLVAL_INTRO;
1252 if (type == OP_GREPSTART || type == OP_ENTERSUB) {
1253 /* Backward compatibility mode: */
1254 o->op_private |= OPpENTERSUB_INARGS;
1255 break;
1256 }
1257 else { /* Compile-time error message: */
1258 OP *kid = cUNOPo->op_first;
1259 CV *cv;
1260 OP *okid;
1261
1262 if (kid->op_type == OP_PUSHMARK)
1263 goto skip_kids;
1264 if (kid->op_type != OP_NULL || kid->op_targ != OP_LIST)
1265 Perl_croak(aTHX_
1266 "panic: unexpected lvalue entersub "
1267 "args: type/targ %ld:%ld",
1268 (long)kid->op_type,kid->op_targ);
1269 kid = kLISTOP->op_first;
1270 skip_kids:
1271 while (kid->op_sibling)
1272 kid = kid->op_sibling;
1273 if (!(kid->op_type == OP_NULL && kid->op_targ == OP_RV2CV)) {
1274 /* Indirect call */
1275 if (kid->op_type == OP_METHOD_NAMED
1276 || kid->op_type == OP_METHOD)
1277 {
349fd7b7 1278 OP *newop;
cd06dffe
GS		 1279
1280 if (kid->op_sibling || kid->op_next != kid) {
1281 yyerror("panic: unexpected optree near method call");
1282 break;
1283 }
1284
349fd7b7
GS		 1285 NewOp(1101, newop, 1, OP);
1286 newop->op_type = OP_RV2CV;
1287 newop->op_ppaddr = PL_ppaddr[OP_RV2CV];
1288 newop->op_next = newop;
1289 kid->op_sibling = newop;
1290 newop->op_private |= OPpLVAL_INTRO;
cd06dffe
GS		 1291 break;
1292 }
1293
1294 if (kid->op_type != OP_RV2CV)
1295 Perl_croak(aTHX_
1296 "panic: unexpected lvalue entersub "
1297 "entry via type/targ %ld:%ld",
1298 (long)kid->op_type,kid->op_targ);
1299 kid->op_private |= OPpLVAL_INTRO;
1300 break; /* Postpone until runtime */
1301 }
1302
1303 okid = kid;
1304 kid = kUNOP->op_first;
1305 if (kid->op_type == OP_NULL && kid->op_targ == OP_RV2SV)
1306 kid = kUNOP->op_first;
1307 if (kid->op_type == OP_NULL)
1308 Perl_croak(aTHX_
1309 "Unexpected constant lvalue entersub "
1310 "entry via type/targ %ld:%ld",
1311 (long)kid->op_type,kid->op_targ);
1312 if (kid->op_type != OP_GV) {
1313 /* Restore RV2CV to check lvalueness */
1314 restore_2cv:
1315 if (kid->op_next && kid->op_next != kid) { /* Happens? */
1316 okid->op_next = kid->op_next;
1317 kid->op_next = okid;
1318 }
1319 else
1320 okid->op_next = Nullop;
1321 okid->op_type = OP_RV2CV;
1322 okid->op_targ = 0;
1323 okid->op_ppaddr = PL_ppaddr[OP_RV2CV];
1324 okid->op_private |= OPpLVAL_INTRO;
1325 break;
1326 }
1327
1328 cv = GvCV(kGVOP->op_gv);
1329 if (!cv)
1330 goto restore_2cv;
1331 if (CvLVALUE(cv))
1332 break;
1333 }
1334 }
79072805
LW		 1335 /* FALL THROUGH */
1336 default:
a0d0e21e
LW		 1337 nomod:
1338 /* grep, foreach, subcalls, refgen */
1339 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1340 break;
cea2e8a9 1341 yyerror(Perl_form(aTHX_ "Can't modify %s in %s",
638bc118 1342 (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
cd06dffe
GS		 1343 ? "do block"
1344 : (o->op_type == OP_ENTERSUB
1345 ? "non-lvalue subroutine call"
1346 : PL_op_desc[o->op_type])),
22c35a8c 1347 type ? PL_op_desc[type] : "local"));
11343788 1348 return o;
79072805 1349
a0d0e21e
LW		 1350 case OP_PREINC:
1351 case OP_PREDEC:
1352 case OP_POW:
1353 case OP_MULTIPLY:
1354 case OP_DIVIDE:
1355 case OP_MODULO:
1356 case OP_REPEAT:
1357 case OP_ADD:
1358 case OP_SUBTRACT:
1359 case OP_CONCAT:
1360 case OP_LEFT_SHIFT:
1361 case OP_RIGHT_SHIFT:
1362 case OP_BIT_AND:
1363 case OP_BIT_XOR:
1364 case OP_BIT_OR:
1365 case OP_I_MULTIPLY:
1366 case OP_I_DIVIDE:
1367 case OP_I_MODULO:
1368 case OP_I_ADD:
1369 case OP_I_SUBTRACT:
11343788 1370 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1371 goto nomod;
3280af22 1372 PL_modcount++;
a0d0e21e
LW		 1373 break;
1374
79072805 1375 case OP_COND_EXPR:
11343788 1376 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1377 mod(kid, type);
79072805
LW		 1378 break;
1379
1380 case OP_RV2AV:
1381 case OP_RV2HV:
93af7a87 1382 if (!type && cUNOPo->op_first->op_type != OP_GV)
cea2e8a9 1383 Perl_croak(aTHX_ "Can't localize through a reference");
11343788 1384 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
3280af22 1385 PL_modcount = 10000;
11343788 1386 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1387 }
1388 /* FALL THROUGH */
79072805 1389 case OP_RV2GV:
5dc0d613 1390 if (scalar_mod_type(o, type))
3fe9a6f1 1391 goto nomod;
11343788 1392 ref(cUNOPo->op_first, o->op_type);
79072805
LW		 1393 /* FALL THROUGH */
1394 case OP_AASSIGN:
1395 case OP_ASLICE:
1396 case OP_HSLICE:
93a17b20
LW		 1397 case OP_NEXTSTATE:
1398 case OP_DBSTATE:
a0d0e21e
LW		 1399 case OP_REFGEN:
1400 case OP_CHOMP:
3280af22 1401 PL_modcount = 10000;
79072805 1402 break;
463ee0b2 1403 case OP_RV2SV:
11343788 1404 if (!type && cUNOPo->op_first->op_type != OP_GV)
cea2e8a9 1405 Perl_croak(aTHX_ "Can't localize through a reference");
aeea060c 1406 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1407 /* FALL THROUGH */
79072805 1408 case OP_GV:
463ee0b2 1409 case OP_AV2ARYLEN:
3280af22 1410 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1411 case OP_SASSIGN:
bf4b1e52
GS		 1412 case OP_ANDASSIGN:
1413 case OP_ORASSIGN:
8990e307 1414 case OP_AELEMFAST:
3280af22 1415 PL_modcount++;
8990e307
LW		 1416 break;
1417
748a9306
LW		 1418 case OP_PADAV:
1419 case OP_PADHV:
3280af22 1420 PL_modcount = 10000;
5196be3e
MB		 1421 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1422 return o; /* Treat \(@foo) like ordinary list. */
1423 if (scalar_mod_type(o, type))
3fe9a6f1 1424 goto nomod;
748a9306
LW		 1425 /* FALL THROUGH */
1426 case OP_PADSV:
3280af22 1427 PL_modcount++;
748a9306 1428 if (!type)
cea2e8a9 1429 Perl_croak(aTHX_ "Can't localize lexical variable %s",
2d8e6c8d 1430 SvPV(*av_fetch(PL_comppad_name, o->op_targ, 4), n_a));
463ee0b2
LW		 1431 break;
1432
554b3eca 1433#ifdef USE_THREADS
2faa37cc 1434 case OP_THREADSV:
533c011a 1435 PL_modcount++; /* XXX ??? */
554b3eca
MB		 1436 break;
1437#endif /* USE_THREADS */
1438
748a9306
LW		 1439 case OP_PUSHMARK:
1440 break;
a0d0e21e 1441
69969c6f
SB		 1442 case OP_KEYS:
1443 if (type != OP_SASSIGN)
1444 goto nomod;
5d82c453
GA		 1445 goto lvalue_func;
1446 case OP_SUBSTR:
1447 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1448 goto nomod;
5f05dabc 1449 /* FALL THROUGH */
a0d0e21e 1450 case OP_POS:
463ee0b2 1451 case OP_VEC:
5d82c453 1452 lvalue_func:
11343788
MB		 1453 pad_free(o->op_targ);
1454 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1455 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1456 if (o->op_flags & OPf_KIDS)
1457 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1458 break;
a0d0e21e 1459
463ee0b2
LW		 1460 case OP_AELEM:
1461 case OP_HELEM:
11343788 1462 ref(cBINOPo->op_first, o->op_type);
68dc0745 1463 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1464 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1465 o->op_private |= OPpLVAL_DEFER;
3280af22 1466 PL_modcount++;
463ee0b2
LW		 1467 break;
1468
1469 case OP_SCOPE:
1470 case OP_LEAVE:
1471 case OP_ENTER:
11343788
MB		 1472 if (o->op_flags & OPf_KIDS)
1473 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1474 break;
1475
1476 case OP_NULL:
638bc118
GS		 1477 if (o->op_flags & OPf_SPECIAL) /* do BLOCK */
1478 goto nomod;
1479 else if (!(o->op_flags & OPf_KIDS))
463ee0b2 1480 break;
11343788
MB		 1481 if (o->op_targ != OP_LIST) {
1482 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1483 break;
1484 }
1485 /* FALL THROUGH */
463ee0b2 1486 case OP_LIST:
11343788 1487 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1488 mod(kid, type);
1489 break;
1490 }
11343788 1491 o->op_flags |= OPf_MOD;
a0d0e21e
LW		 1492
1493 if (type == OP_AASSIGN || type == OP_SASSIGN)
11343788 1494 o->op_flags |= OPf_SPECIAL|OPf_REF;
a0d0e21e 1495 else if (!type) {
11343788
MB		 1496 o->op_private |= OPpLVAL_INTRO;
1497 o->op_flags &= ~OPf_SPECIAL;
3280af22 1498 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1499 }
a0d0e21e 1500 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
11343788
MB		 1501 o->op_flags |= OPf_REF;
1502 return o;
463ee0b2
LW		 1503}
1504
864dbfa3 1505STATIC bool
cea2e8a9 1506S_scalar_mod_type(pTHX_ OP *o, I32 type)
3fe9a6f1 1507{
1508 switch (type) {
1509 case OP_SASSIGN:
5196be3e 1510 if (o->op_type == OP_RV2GV)
3fe9a6f1 1511 return FALSE;
1512 /* FALL THROUGH */
1513 case OP_PREINC:
1514 case OP_PREDEC:
1515 case OP_POSTINC:
1516 case OP_POSTDEC:
1517 case OP_I_PREINC:
1518 case OP_I_PREDEC:
1519 case OP_I_POSTINC:
1520 case OP_I_POSTDEC:
1521 case OP_POW:
1522 case OP_MULTIPLY:
1523 case OP_DIVIDE:
1524 case OP_MODULO:
1525 case OP_REPEAT:
1526 case OP_ADD:
1527 case OP_SUBTRACT:
1528 case OP_I_MULTIPLY:
1529 case OP_I_DIVIDE:
1530 case OP_I_MODULO:
1531 case OP_I_ADD:
1532 case OP_I_SUBTRACT:
1533 case OP_LEFT_SHIFT:
1534 case OP_RIGHT_SHIFT:
1535 case OP_BIT_AND:
1536 case OP_BIT_XOR:
1537 case OP_BIT_OR:
1538 case OP_CONCAT:
1539 case OP_SUBST:
1540 case OP_TRANS:
49e9fbe6
GS		 1541 case OP_READ:
1542 case OP_SYSREAD:
1543 case OP_RECV:
bf4b1e52
GS		 1544 case OP_ANDASSIGN:
1545 case OP_ORASSIGN:
3fe9a6f1 1546 return TRUE;
1547 default:
1548 return FALSE;
1549 }
1550}
1551
35cd451c 1552STATIC bool
cea2e8a9 1553S_is_handle_constructor(pTHX_ OP *o, I32 argnum)
35cd451c
GS		 1554{
1555 switch (o->op_type) {
1556 case OP_PIPE_OP:
1557 case OP_SOCKPAIR:
1558 if (argnum == 2)
1559 return TRUE;
1560 /* FALL THROUGH */
1561 case OP_SYSOPEN:
1562 case OP_OPEN:
ded8aa31 1563 case OP_SELECT: /* XXX c.f. SelectSaver.pm */
35cd451c
GS		 1564 case OP_SOCKET:
1565 case OP_OPEN_DIR:
1566 case OP_ACCEPT:
1567 if (argnum == 1)
1568 return TRUE;
1569 /* FALL THROUGH */
1570 default:
1571 return FALSE;
1572 }
1573}
1574
463ee0b2 1575OP *
864dbfa3 1576Perl_refkids(pTHX_ OP *o, I32 type)
463ee0b2
LW		 1577{
1578 OP *kid;
11343788
MB		 1579 if (o && o->op_flags & OPf_KIDS) {
1580 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1581 ref(kid, type);
1582 }
11343788 1583 return o;
463ee0b2
LW		 1584}
1585
1586OP *
864dbfa3 1587Perl_ref(pTHX_ OP *o, I32 type)
463ee0b2
LW		 1588{
1589 OP *kid;
463ee0b2 1590
3280af22 1591 if (!o || PL_error_count)
11343788 1592 return o;
463ee0b2 1593
11343788 1594 switch (o->op_type) {
a0d0e21e 1595 case OP_ENTERSUB:
e55aaa0e 1596 if ((type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1597 !(o->op_flags & OPf_STACKED)) {
1598 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1599 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1600 assert(cUNOPo->op_first->op_type == OP_NULL);
1601 null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
1602 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1603 }
1604 break;
aeea060c 1605
463ee0b2 1606 case OP_COND_EXPR:
11343788 1607 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1608 ref(kid, type);
1609 break;
8990e307 1610 case OP_RV2SV:
35cd451c
GS		 1611 if (type == OP_DEFINED)
1612 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1613 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1614 /* FALL THROUGH */
1615 case OP_PADSV:
5f05dabc 1616 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1617 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1618 : type == OP_RV2HV ? OPpDEREF_HV
1619 : OPpDEREF_SV);
11343788 1620 o->op_flags |= OPf_MOD;
a0d0e21e 1621 }
8990e307
LW		 1622 break;
1623
2faa37cc 1624 case OP_THREADSV:
a863c7d1
MB		 1625 o->op_flags |= OPf_MOD; /* XXX ??? */
1626 break;
1627
463ee0b2
LW		 1628 case OP_RV2AV:
1629 case OP_RV2HV:
aeea060c 1630 o->op_flags |= OPf_REF;
8990e307 1631 /* FALL THROUGH */
463ee0b2 1632 case OP_RV2GV:
35cd451c
GS		 1633 if (type == OP_DEFINED)
1634 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1635 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1636 break;
8990e307 1637
463ee0b2
LW		 1638 case OP_PADAV:
1639 case OP_PADHV:
aeea060c 1640 o->op_flags |= OPf_REF;
79072805 1641 break;
aeea060c 1642
8990e307 1643 case OP_SCALAR:
79072805 1644 case OP_NULL:
11343788 1645 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1646 break;
11343788 1647 ref(cBINOPo->op_first, type);
79072805
LW		 1648 break;
1649 case OP_AELEM:
1650 case OP_HELEM:
11343788 1651 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1652 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1653 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1654 : type == OP_RV2HV ? OPpDEREF_HV
1655 : OPpDEREF_SV);
11343788 1656 o->op_flags |= OPf_MOD;
8990e307 1657 }
79072805
LW		 1658 break;
1659
463ee0b2 1660 case OP_SCOPE:
79072805
LW		 1661 case OP_LEAVE:
1662 case OP_ENTER:
8990e307 1663 case OP_LIST:
11343788 1664 if (!(o->op_flags & OPf_KIDS))
79072805 1665 break;
11343788 1666 ref(cLISTOPo->op_last, type);
79072805 1667 break;
a0d0e21e
LW		 1668 default:
1669 break;
79072805 1670 }
11343788 1671 return scalar(o);
8990e307 1672
79072805
LW		 1673}
1674
09bef843
SB		 1675STATIC OP *
1676S_dup_attrlist(pTHX_ OP *o)
1677{
1678 OP *rop = Nullop;
1679
1680 /* An attrlist is either a simple OP_CONST or an OP_LIST with kids,
1681 * where the first kid is OP_PUSHMARK and the remaining ones
1682 * are OP_CONST. We need to push the OP_CONST values.
1683 */
1684 if (o->op_type == OP_CONST)
1685 rop = newSVOP(OP_CONST, o->op_flags, SvREFCNT_inc(cSVOPo->op_sv));
1686 else {
1687 assert((o->op_type == OP_LIST) && (o->op_flags & OPf_KIDS));
1688 for (o = cLISTOPo->op_first; o; o=o->op_sibling) {
1689 if (o->op_type == OP_CONST)
1690 rop = append_elem(OP_LIST, rop,
1691 newSVOP(OP_CONST, o->op_flags,
1692 SvREFCNT_inc(cSVOPo->op_sv)));
1693 }
1694 }
1695 return rop;
1696}
1697
1698STATIC void
1699S_apply_attrs(pTHX_ HV *stash, SV *target, OP *attrs)
1700{
1701 OP *modname; /* for 'use' */
1702 SV *stashsv;
1703
1704 /* fake up C<use attributes $pkg,$rv,@attrs> */
1705 ENTER; /* need to protect against side-effects of 'use' */
1706 SAVEINT(PL_expect);
1707 if (stash && HvNAME(stash))
1708 stashsv = newSVpv(HvNAME(stash), 0);
1709 else
1710 stashsv = &PL_sv_no;
1711#define ATTRSMODULE "attributes"
1712 modname = newSVOP(OP_CONST, 0,
1713 newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1));
1714 modname->op_private |= OPpCONST_BARE;
1715 /* that flag is required to make 'use' work right */
1716 utilize(1, start_subparse(FALSE, 0),
1717 Nullop, /* version */
1718 modname,
1719 prepend_elem(OP_LIST,
1720 newSVOP(OP_CONST, 0, stashsv),
1721 prepend_elem(OP_LIST,
1722 newSVOP(OP_CONST, 0, newRV(target)),
1723 dup_attrlist(attrs))));
1724 LEAVE;
1725}
1726
1727STATIC OP *
1728S_my_kid(pTHX_ OP *o, OP *attrs)
93a17b20
LW		 1729{
1730 OP *kid;
93a17b20
LW		 1731 I32 type;
1732
3280af22 1733 if (!o || PL_error_count)
11343788 1734 return o;
93a17b20 1735
11343788 1736 type = o->op_type;
93a17b20 1737 if (type == OP_LIST) {
11343788 1738 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
09bef843 1739 my_kid(kid, attrs);
dab48698 1740 } else if (type == OP_UNDEF) {
7766148a 1741 return o;
77ca0c92
LW		 1742 } else if (type == OP_RV2SV || /* "our" declaration */
1743 type == OP_RV2AV ||
1744 type == OP_RV2HV) { /* XXX does this let anything illegal in? */
1745 return o;
dab48698 1746 } else if (type != OP_PADSV &&
93a17b20
LW		 1747 type != OP_PADAV &&
1748 type != OP_PADHV &&
1749 type != OP_PUSHMARK)
1750 {
cea2e8a9 1751 yyerror(Perl_form(aTHX_ "Can't declare %s in my", PL_op_desc[o->op_type]));
11343788 1752 return o;
93a17b20 1753 }
09bef843
SB		 1754 else if (attrs && type != OP_PUSHMARK) {
1755 HV *stash;
1756 SV *padsv;
1757 SV **namesvp;
1758
1759 /* check for C<my Dog $spot> when deciding package */
1760 namesvp = av_fetch(PL_comppad_name, o->op_targ, FALSE);
1761 if (namesvp && *namesvp && SvOBJECT(*namesvp) && HvNAME(SvSTASH(*namesvp)))
1762 stash = SvSTASH(*namesvp);
1763 else
1764 stash = PL_curstash;
1765 padsv = PAD_SV(o->op_targ);
1766 apply_attrs(stash, padsv, attrs);
1767 }
11343788
MB		 1768 o->op_flags |= OPf_MOD;
1769 o->op_private |= OPpLVAL_INTRO;
1770 return o;
93a17b20
LW		 1771}
1772
1773OP *
09bef843
SB		 1774Perl_my_attrs(pTHX_ OP *o, OP *attrs)
1775{
1776 if (o->op_flags & OPf_PARENS)
1777 list(o);
1778 PL_in_my = FALSE;
1779 PL_in_my_stash = Nullhv;
1780 if (attrs)
1781 SAVEFREEOP(attrs);
1782 return my_kid(o, attrs);
1783}
1784
1785OP *
1786Perl_my(pTHX_ OP *o)
1787{
1788 return my_kid(o, Nullop);
1789}
1790
1791OP *
864dbfa3 1792Perl_sawparens(pTHX_ OP *o)
79072805
LW		 1793{
1794 if (o)
1795 o->op_flags |= OPf_PARENS;
1796 return o;
1797}
1798
1799OP *
864dbfa3 1800Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
79072805 1801{
d008e5eb 1802 dTHR;
11343788 1803 OP *o;
79072805 1804
599cee73
PM		 1805 if (ckWARN(WARN_UNSAFE) &&
1806 (left->op_type == OP_RV2AV ||
1807 left->op_type == OP_RV2HV ||
1808 left->op_type == OP_PADAV ||
1809 left->op_type == OP_PADHV)) {
22c35a8c 1810 char *desc = PL_op_desc[(right->op_type == OP_SUBST ||
599cee73
PM		 1811 right->op_type == OP_TRANS)
1812 ? right->op_type : OP_MATCH];
1813 char *sample = ((left->op_type == OP_RV2AV ||
1814 left->op_type == OP_PADAV)
1815 ? "@array" : "%hash");
cea2e8a9 1816 Perl_warner(aTHX_ WARN_UNSAFE,
599cee73
PM		 1817 "Applying %s to %s will act on scalar(%s)",
1818 desc, sample, sample);
2ae324a7 1819 }
1820
79072805
LW		 1821 if (right->op_type == OP_MATCH ||
1822 right->op_type == OP_SUBST ||
1823 right->op_type == OP_TRANS) {
1824 right->op_flags |= OPf_STACKED;
1825 if (right->op_type != OP_MATCH)
463ee0b2 1826 left = mod(left, right->op_type);
79072805 1827 if (right->op_type == OP_TRANS)
11343788 1828 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1829 else
11343788 1830 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1831 if (type == OP_NOT)
11343788
MB		 1832 return newUNOP(OP_NOT, 0, scalar(o));
1833 return o;
79072805
LW		 1834 }
1835 else
1836 return bind_match(type, left,
1837 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1838}
1839
1840OP *
864dbfa3 1841Perl_invert(pTHX_ OP *o)
79072805 1842{
11343788
MB		 1843 if (!o)
1844 return o;
79072805 1845 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1846 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1847}
1848
1849OP *
864dbfa3 1850Perl_scope(pTHX_ OP *o)
79072805
LW		 1851{
1852 if (o) {
3280af22 1853 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1854 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1855 o->op_type = OP_LEAVE;
22c35a8c 1856 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2
LW		 1857 }
1858 else {
1859 if (o->op_type == OP_LINESEQ) {
1860 OP *kid;
1861 o->op_type = OP_SCOPE;
22c35a8c 1862 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
463ee0b2 1863 kid = ((LISTOP*)o)->op_first;
748a9306 1864 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
7399586d
HS		 1865 kid->op_type = OP_SETSTATE;
1866 kid->op_ppaddr = PL_ppaddr[OP_SETSTATE];
748a9306 1867 }
463ee0b2
LW		 1868 }
1869 else
748a9306 1870 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1871 }
79072805
LW		 1872 }
1873 return o;
1874}
1875
b3ac6de7 1876void
864dbfa3 1877Perl_save_hints(pTHX)
b3ac6de7 1878{
3280af22
NIS		 1879 SAVEI32(PL_hints);
1880 SAVESPTR(GvHV(PL_hintgv));
1881 GvHV(PL_hintgv) = newHVhv(GvHV(PL_hintgv));
1882 SAVEFREESV(GvHV(PL_hintgv));
b3ac6de7
IZ		 1883}
1884
a0d0e21e 1885int
864dbfa3 1886Perl_block_start(pTHX_ int full)
79072805 1887{
11343788 1888 dTHR;
3280af22 1889 int retval = PL_savestack_ix;
b3ac6de7 1890
3280af22 1891 SAVEI32(PL_comppad_name_floor);
55497cff 1892 if (full) {
3280af22
NIS		 1893 if ((PL_comppad_name_fill = AvFILLp(PL_comppad_name)) > 0)
1894 PL_comppad_name_floor = PL_comppad_name_fill;
55497cff 1895 else
3280af22
NIS		 1896 PL_comppad_name_floor = 0;
1897 }
1898 SAVEI32(PL_min_intro_pending);
1899 SAVEI32(PL_max_intro_pending);
1900 PL_min_intro_pending = 0;
1901 SAVEI32(PL_comppad_name_fill);
1902 SAVEI32(PL_padix_floor);
1903 PL_padix_floor = PL_padix;
1904 PL_pad_reset_pending = FALSE;
b3ac6de7 1905 SAVEHINTS();
3280af22 1906 PL_hints &= ~HINT_BLOCK_SCOPE;
e24b16f9 1907 SAVEPPTR(PL_compiling.cop_warnings);
0453d815 1908 if (! specialWARN(PL_compiling.cop_warnings)) {
599cee73
PM		 1909 PL_compiling.cop_warnings = newSVsv(PL_compiling.cop_warnings) ;
1910 SAVEFREESV(PL_compiling.cop_warnings) ;
1911 }
1912
1913
a0d0e21e
LW		 1914 return retval;
1915}
1916
1917OP*
864dbfa3 1918Perl_block_end(pTHX_ I32 floor, OP *seq)
a0d0e21e 1919{
11343788 1920 dTHR;
3280af22 1921 int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
a0d0e21e 1922 OP* retval = scalarseq(seq);
a0d0e21e 1923 LEAVE_SCOPE(floor);
3280af22 1924 PL_pad_reset_pending = FALSE;
e24b16f9 1925 PL_compiling.op_private = PL_hints;
a0d0e21e 1926 if (needblockscope)
3280af22
NIS		 1927 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
1928 pad_leavemy(PL_comppad_name_fill);
1929 PL_cop_seqmax++;
a0d0e21e
LW		 1930 return retval;
1931}
1932
76e3520e 1933STATIC OP *
cea2e8a9 1934S_newDEFSVOP(pTHX)
54b9620d
MB		 1935{
1936#ifdef USE_THREADS
1937 OP *o = newOP(OP_THREADSV, 0);
1938 o->op_targ = find_threadsv("_");
1939 return o;
1940#else
3280af22 1941 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
54b9620d
MB		 1942#endif /* USE_THREADS */
1943}
1944
a0d0e21e 1945void
864dbfa3 1946Perl_newPROG(pTHX_ OP *o)
a0d0e21e 1947{
11343788 1948 dTHR;
3280af22 1949 if (PL_in_eval) {
b295d113
TH		 1950 if (PL_eval_root)
1951 return;
faef0170
HS		 1952 PL_eval_root = newUNOP(OP_LEAVEEVAL,
1953 ((PL_in_eval & EVAL_KEEPERR)
1954 ? OPf_SPECIAL : 0), o);
3280af22
NIS		 1955 PL_eval_start = linklist(PL_eval_root);
1956 PL_eval_root->op_next = 0;
1957 peep(PL_eval_start);
a0d0e21e
LW		 1958 }
1959 else {
5dc0d613 1960 if (!o)
a0d0e21e 1961 return;
3280af22
NIS		 1962 PL_main_root = scope(sawparens(scalarvoid(o)));
1963 PL_curcop = &PL_compiling;
1964 PL_main_start = LINKLIST(PL_main_root);
1965 PL_main_root->op_next = 0;
1966 peep(PL_main_start);
1967 PL_compcv = 0;
3841441e 1968
4fdae800 1969 /* Register with debugger */
84902520 1970 if (PERLDB_INTER) {
864dbfa3 1971 CV *cv = get_cv("DB::postponed", FALSE);
3841441e
CS		 1972 if (cv) {
1973 dSP;
924508f0 1974 PUSHMARK(SP);
3280af22 1975 XPUSHs((SV*)PL_compiling.cop_filegv);
3841441e 1976 PUTBACK;
864dbfa3 1977 call_sv((SV*)cv, G_DISCARD);
3841441e
CS		 1978 }
1979 }
79072805 1980 }
79072805
LW		 1981}
1982
1983OP *
864dbfa3 1984Perl_localize(pTHX_ OP *o, I32 lex)
79072805
LW		 1985{
1986 if (o->op_flags & OPf_PARENS)
1987 list(o);
8990e307 1988 else {
d008e5eb 1989 dTHR;
599cee73 1990 if (ckWARN(WARN_PARENTHESIS) && PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ',') {
8990e307 1991 char *s;
834a4ddd 1992 for (s = PL_bufptr; *s && (isALNUM(*s) || (*s & 0x80) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1993 if (*s == ';' || *s == '=')
cea2e8a9 1994 Perl_warner(aTHX_ WARN_PARENTHESIS, "Parentheses missing around \"%s\" list",
599cee73 1995 lex ? "my" : "local");
8990e307
LW		 1996 }
1997 }
3280af22
NIS		 1998 PL_in_my = FALSE;
1999 PL_in_my_stash = Nullhv;
93a17b20
LW		 2000 if (lex)
2001 return my(o);
2002 else
463ee0b2 2003 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 2004}
2005
2006OP *
864dbfa3 2007Perl_jmaybe(pTHX_ OP *o)
79072805
LW		 2008{
2009 if (o->op_type == OP_LIST) {
554b3eca
MB		 2010 OP *o2;
2011#ifdef USE_THREADS
2faa37cc 2012 o2 = newOP(OP_THREADSV, 0);
54b9620d 2013 o2->op_targ = find_threadsv(";");
554b3eca
MB		 2014#else
2015 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
2016#endif /* USE_THREADS */
2017 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 2018 }
2019 return o;
2020}
2021
2022OP *
864dbfa3 2023Perl_fold_constants(pTHX_ register OP *o)
79072805 2024{
11343788 2025 dTHR;
79072805
LW		 2026 register OP *curop;
2027 I32 type = o->op_type;
748a9306 2028 SV *sv;
79072805 2029
22c35a8c 2030 if (PL_opargs[type] & OA_RETSCALAR)
79072805 2031 scalar(o);
b162f9ea 2032 if (PL_opargs[type] & OA_TARGET && !o->op_targ)
ed6116ce 2033 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 2034
eac055e9
GS		 2035 /* integerize op, unless it happens to be C<-foo>.
2036 * XXX should pp_i_negate() do magic string negation instead? */
2037 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)
2038 && !(type == OP_NEGATE && cUNOPo->op_first->op_type == OP_CONST
2039 && (cUNOPo->op_first->op_private & OPpCONST_BARE)))
2040 {
22c35a8c 2041 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
eac055e9 2042 }
85e6fe83 2043
22c35a8c 2044 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 2045 goto nope;
2046
de939608 2047 switch (type) {
7a52d87a
GS		 2048 case OP_NEGATE:
2049 /* XXX might want a ck_negate() for this */
2050 cUNOPo->op_first->op_private &= ~OPpCONST_STRICT;
2051 break;
de939608
CS		 2052 case OP_SPRINTF:
2053 case OP_UCFIRST:
2054 case OP_LCFIRST:
2055 case OP_UC:
2056 case OP_LC:
69dcf70c
MB		 2057 case OP_SLT:
2058 case OP_SGT:
2059 case OP_SLE:
2060 case OP_SGE:
2061 case OP_SCMP:
2062
de939608
CS		 2063 if (o->op_private & OPpLOCALE)
2064 goto nope;
2065 }
2066
3280af22 2067 if (PL_error_count)
a0d0e21e
LW		 2068 goto nope; /* Don't try to run w/ errors */
2069
79072805 2070 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
11fa937b
GS		 2071 if ((curop->op_type != OP_CONST ||
2072 (curop->op_private & OPpCONST_BARE)) &&
7a52d87a
GS		 2073 curop->op_type != OP_LIST &&
2074 curop->op_type != OP_SCALAR &&
2075 curop->op_type != OP_NULL &&
2076 curop->op_type != OP_PUSHMARK)
2077 {
79072805
LW		 2078 goto nope;
2079 }
2080 }
2081
2082 curop = LINKLIST(o);
2083 o->op_next = 0;
533c011a 2084 PL_op = curop;
cea2e8a9 2085 CALLRUNOPS(aTHX);
3280af22 2086 sv = *(PL_stack_sp--);
748a9306 2087 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 2088 pad_swipe(o->op_targ);
748a9306
LW		 2089 else if (SvTEMP(sv)) { /* grab mortal temp? */
2090 (void)SvREFCNT_inc(sv);
2091 SvTEMP_off(sv);
85e6fe83 2092 }
79072805
LW		 2093 op_free(o);
2094 if (type == OP_RV2GV)
b1cb66bf 2095 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306 2096 else {
ee580363
GS		 2097 /* try to smush double to int, but don't smush -2.0 to -2 */
2098 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK &&
2099 type != OP_NEGATE)
2100 {
748a9306 2101 IV iv = SvIV(sv);
65202027 2102 if ((NV)iv == SvNV(sv)) {
748a9306
LW		 2103 SvREFCNT_dec(sv);
2104 sv = newSViv(iv);
2105 }
b1cb66bf 2106 else
2107 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 2108 }
2109 return newSVOP(OP_CONST, 0, sv);
2110 }
aeea060c 2111
79072805 2112 nope:
22c35a8c 2113 if (!(PL_opargs[type] & OA_OTHERINT))
79072805 2114 return o;
79072805 2115
3280af22 2116 if (!(PL_hints & HINT_INTEGER)) {
a0d0e21e 2117 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 2118 return o;
2119
2120 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
2121 if (curop->op_type == OP_CONST) {
b1cb66bf 2122 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 2123 continue;
2124 return o;
2125 }
22c35a8c 2126 if (PL_opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 2127 continue;
2128 return o;
2129 }
22c35a8c 2130 o->op_ppaddr = PL_ppaddr[++(o->op_type)];
79072805
LW		 2131 }
2132
79072805
LW		 2133 return o;
2134}
2135
2136OP *
864dbfa3 2137Perl_gen_constant_list(pTHX_ register OP *o)
79072805 2138{
11343788 2139 dTHR;
79072805 2140 register OP *curop;
3280af22 2141 I32 oldtmps_floor = PL_tmps_floor;
79072805 2142
a0d0e21e 2143 list(o);
3280af22 2144 if (PL_error_count)
a0d0e21e
LW		 2145 return o; /* Don't attempt to run with errors */
2146
533c011a 2147 PL_op = curop = LINKLIST(o);
a0d0e21e 2148 o->op_next = 0;
cea2e8a9
GS		 2149 pp_pushmark();
2150 CALLRUNOPS(aTHX);
533c011a 2151 PL_op = curop;
cea2e8a9 2152 pp_anonlist();
3280af22 2153 PL_tmps_floor = oldtmps_floor;
79072805
LW		 2154
2155 o->op_type = OP_RV2AV;
22c35a8c 2156 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 2157 curop = ((UNOP*)o)->op_first;
3280af22 2158 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*PL_stack_sp--));
79072805 2159 op_free(curop);
79072805
LW		 2160 linklist(o);
2161 return list(o);
2162}
2163
2164OP *
864dbfa3 2165Perl_convert(pTHX_ I32 type, I32 flags, OP *o)
79072805
LW		 2166{
2167 OP *kid;
a0d0e21e 2168 OP *last = 0;
79072805 2169
11343788
MB		 2170 if (!o || o->op_type != OP_LIST)
2171 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 2172 else
5dc0d613 2173 o->op_flags &= ~OPf_WANT;
79072805 2174
22c35a8c 2175 if (!(PL_opargs[type] & OA_MARK))
11343788 2176 null(cLISTOPo->op_first);
8990e307 2177
11343788 2178 o->op_type = type;
22c35a8c 2179 o->op_ppaddr = PL_ppaddr[type];
11343788 2180 o->op_flags |= flags;
79072805 2181
11343788
MB		 2182 o = CHECKOP(type, o);
2183 if (o->op_type != type)
2184 return o;
79072805 2185
11343788 2186 if (cLISTOPo->op_children < 7) {
79072805 2187 /* XXX do we really need to do this if we're done appending?? */
11343788 2188 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805 2189 last = kid;
11343788 2190 cLISTOPo->op_last = last; /* in case check substituted last arg */
79072805
LW		 2191 }
2192
11343788 2193 return fold_constants(o);
79072805
LW		 2194}
2195
2196/* List constructors */
2197
2198OP *
864dbfa3 2199Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2200{
2201 if (!first)
2202 return last;
8990e307
LW		 2203
2204 if (!last)
79072805 2205 return first;
8990e307 2206
a0d0e21e
LW		 2207 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
2208 return newLISTOP(type, 0, first, last);
79072805 2209
a0d0e21e
LW		 2210 if (first->op_flags & OPf_KIDS)
2211 ((LISTOP*)first)->op_last->op_sibling = last;
2212 else {
2213 first->op_flags |= OPf_KIDS;
2214 ((LISTOP*)first)->op_first = last;
2215 }
2216 ((LISTOP*)first)->op_last = last;
2217 ((LISTOP*)first)->op_children++;
2218 return first;
79072805
LW		 2219}
2220
2221OP *
864dbfa3 2222Perl_append_list(pTHX_ I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2223{
2224 if (!first)
2225 return (OP*)last;
8990e307
LW		 2226
2227 if (!last)
79072805 2228 return (OP*)first;
8990e307
LW		 2229
2230 if (first->op_type != type)
79072805 2231 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 2232
2233 if (last->op_type != type)
79072805
LW		 2234 return append_elem(type, (OP*)first, (OP*)last);
2235
2236 first->op_last->op_sibling = last->op_first;
2237 first->op_last = last->op_last;
2238 first->op_children += last->op_children;
2239 if (first->op_children)
acb74605 2240 first->op_flags |= OPf_KIDS;
b7dc083c
NIS		 2241
2242#ifdef PL_OP_SLAB_ALLOC
2243#else
2244 Safefree(last);
2245#endif
79072805
LW		 2246 return (OP*)first;
2247}
2248
2249OP *
864dbfa3 2250Perl_prepend_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2251{
2252 if (!first)
2253 return last;
8990e307
LW		 2254
2255 if (!last)
79072805 2256 return first;
8990e307
LW		 2257
2258 if (last->op_type == type) {
2259 if (type == OP_LIST) { /* already a PUSHMARK there */
2260 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2261 ((LISTOP*)last)->op_first->op_sibling = first;
2262 }
2263 else {
2264 if (!(last->op_flags & OPf_KIDS)) {
2265 ((LISTOP*)last)->op_last = first;
2266 last->op_flags |= OPf_KIDS;
2267 }
2268 first->op_sibling = ((LISTOP*)last)->op_first;
2269 ((LISTOP*)last)->op_first = first;
79072805 2270 }
79072805
LW		 2271 ((LISTOP*)last)->op_children++;
2272 return last;
2273 }
2274
2275 return newLISTOP(type, 0, first, last);
2276}
2277
2278/* Constructors */
2279
2280OP *
864dbfa3 2281Perl_newNULLLIST(pTHX)
79072805 2282{
8990e307
LW		 2283 return newOP(OP_STUB, 0);
2284}
2285
2286OP *
864dbfa3 2287Perl_force_list(pTHX_ OP *o)
8990e307 2288{
11343788
MB		 2289 if (!o || o->op_type != OP_LIST)
2290 o = newLISTOP(OP_LIST, 0, o, Nullop);
2291 null(o);
2292 return o;
79072805
LW		 2293}
2294
2295OP *
864dbfa3 2296Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2297{
2298 LISTOP *listop;
2299
b7dc083c 2300 NewOp(1101, listop, 1, LISTOP);
79072805
LW		 2301
2302 listop->op_type = type;
22c35a8c 2303 listop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2304 listop->op_children = (first != 0) + (last != 0);
2305 listop->op_flags = flags;
79072805
LW		 2306
2307 if (!last && first)
2308 last = first;
2309 else if (!first && last)
2310 first = last;
8990e307
LW		 2311 else if (first)
2312 first->op_sibling = last;
79072805
LW		 2313 listop->op_first = first;
2314 listop->op_last = last;
8990e307
LW		 2315 if (type == OP_LIST) {
2316 OP* pushop;
2317 pushop = newOP(OP_PUSHMARK, 0);
2318 pushop->op_sibling = first;
2319 listop->op_first = pushop;
2320 listop->op_flags |= OPf_KIDS;
2321 if (!last)
2322 listop->op_last = pushop;
2323 }
2324 else if (listop->op_children)
2325 listop->op_flags |= OPf_KIDS;
79072805
LW		 2326
2327 return (OP*)listop;
2328}
2329
2330OP *
864dbfa3 2331Perl_newOP(pTHX_ I32 type, I32 flags)
79072805 2332{
11343788 2333 OP *o;
b7dc083c 2334 NewOp(1101, o, 1, OP);
11343788 2335 o->op_type = type;
22c35a8c 2336 o->op_ppaddr = PL_ppaddr[type];
11343788 2337 o->op_flags = flags;
79072805 2338
11343788
MB		 2339 o->op_next = o;
2340 o->op_private = 0 + (flags >> 8);
22c35a8c 2341 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2342 scalar(o);
22c35a8c 2343 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2344 o->op_targ = pad_alloc(type, SVs_PADTMP);
2345 return CHECKOP(type, o);
79072805
LW		 2346}
2347
2348OP *
864dbfa3 2349Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first)
79072805
LW		 2350{
2351 UNOP *unop;
2352
93a17b20 2353 if (!first)
aeea060c 2354 first = newOP(OP_STUB, 0);
22c35a8c 2355 if (PL_opargs[type] & OA_MARK)
8990e307 2356 first = force_list(first);
93a17b20 2357
b7dc083c 2358 NewOp(1101, unop, 1, UNOP);
79072805 2359 unop->op_type = type;
22c35a8c 2360 unop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2361 unop->op_first = first;
2362 unop->op_flags = flags | OPf_KIDS;
c07a80fd 2363 unop->op_private = 1 | (flags >> 8);
e50aee73 2364 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2365 if (unop->op_next)
2366 return (OP*)unop;
2367
a0d0e21e 2368 return fold_constants((OP *) unop);
79072805
LW		 2369}
2370
2371OP *
864dbfa3 2372Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2373{
2374 BINOP *binop;
b7dc083c 2375 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2376
2377 if (!first)
2378 first = newOP(OP_NULL, 0);
2379
2380 binop->op_type = type;
22c35a8c 2381 binop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2382 binop->op_first = first;
2383 binop->op_flags = flags | OPf_KIDS;
2384 if (!last) {
2385 last = first;
c07a80fd 2386 binop->op_private = 1 | (flags >> 8);
79072805
LW		 2387 }
2388 else {
c07a80fd 2389 binop->op_private = 2 | (flags >> 8);
79072805
LW		 2390 first->op_sibling = last;
2391 }
2392
e50aee73 2393 binop = (BINOP*)CHECKOP(type, binop);
b162f9ea 2394 if (binop->op_next || binop->op_type != type)
79072805
LW		 2395 return (OP*)binop;
2396
7284ab6f 2397 binop->op_last = binop->op_first->op_sibling;
79072805 2398
a0d0e21e 2399 return fold_constants((OP *)binop);
79072805
LW		 2400}
2401
a0ed51b3
LW		 2402static int
2403utf8compare(const void *a, const void *b)
2404{
2405 int i;
2406 for (i = 0; i < 10; i++) {
2407 if ((*(U8**)a)[i] < (*(U8**)b)[i])
2408 return -1;
2409 if ((*(U8**)a)[i] > (*(U8**)b)[i])
2410 return 1;
2411 }
2412 return 0;
2413}
2414
79072805 2415OP *
864dbfa3 2416Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2417{
79072805
LW		 2418 SV *tstr = ((SVOP*)expr)->op_sv;
2419 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2420 STRLEN tlen;
2421 STRLEN rlen;
ec49126f 2422 register U8 *t = (U8*)SvPV(tstr, tlen);
2423 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 2424 register I32 i;
2425 register I32 j;
a0ed51b3 2426 I32 del;
79072805 2427 I32 complement;
5d06d08e 2428 I32 squash;
79072805
LW		 2429 register short *tbl;
2430
11343788 2431 complement = o->op_private & OPpTRANS_COMPLEMENT;
a0ed51b3 2432 del = o->op_private & OPpTRANS_DELETE;
5d06d08e 2433 squash = o->op_private & OPpTRANS_SQUASH;
79072805 2434
a0ed51b3 2435 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
79cb57f6 2436 SV* listsv = newSVpvn("# comment\n",10);
a0ed51b3
LW		 2437 SV* transv = 0;
2438 U8* tend = t + tlen;
2439 U8* rend = r + rlen;
2440 I32 ulen;
2441 U32 tfirst = 1;
2442 U32 tlast = 0;
2443 I32 tdiff;
2444 U32 rfirst = 1;
2445 U32 rlast = 0;
2446 I32 rdiff;
2447 I32 diff;
2448 I32 none = 0;
2449 U32 max = 0;
2450 I32 bits;
2451 I32 grows = 0;
2452 I32 havefinal = 0;
2453 U32 final;
2454 HV *hv;
2455 I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2456 I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
2457
2458 if (complement) {
2459 U8 tmpbuf[10];
2460 U8** cp;
2461 UV nextmin = 0;
2462 New(1109, cp, tlen, U8*);
2463 i = 0;
79cb57f6 2464 transv = newSVpvn("",0);
a0ed51b3
LW		 2465 while (t < tend) {
2466 cp[i++] = t;
2467 t += UTF8SKIP(t);
2468 if (*t == 0xff) {
2469 t++;
2470 t += UTF8SKIP(t);
2471 }
2472 }
2473 qsort(cp, i, sizeof(U8*), utf8compare);
2474 for (j = 0; j < i; j++) {
2475 U8 *s = cp[j];
2476 UV val = utf8_to_uv(s, &ulen);
2477 s += ulen;
2478 diff = val - nextmin;
2479 if (diff > 0) {
2480 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2481 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2482 if (diff > 1) {
2483 t = uv_to_utf8(tmpbuf, val - 1);
2484 sv_catpvn(transv, "\377", 1);
dfe13c55 2485 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2486 }
2487 }
2488 if (*s == 0xff)
2489 val = utf8_to_uv(s+1, &ulen);
2490 if (val >= nextmin)
2491 nextmin = val + 1;
2492 }
2493 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2494 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2495 t = uv_to_utf8(tmpbuf, 0x7fffffff);
2496 sv_catpvn(transv, "\377", 1);
dfe13c55
GS		 2497 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2498 t = (U8*)SvPVX(transv);
a0ed51b3
LW		 2499 tlen = SvCUR(transv);
2500 tend = t + tlen;
2501 }
2502 else if (!rlen && !del) {
2503 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2504 }
2505 if (!squash) {
2506 if (to_utf && from_utf) { /* only counting characters */
2507 if (t == r || (tlen == rlen && memEQ(t, r, tlen)))
2508 o->op_private |= OPpTRANS_IDENTICAL;
2509 }
2510 else { /* straight latin-1 translation */
2511 if (tlen == 4 && memEQ(t, "\0\377\303\277", 4) &&
2512 rlen == 4 && memEQ(r, "\0\377\303\277", 4))
2513 o->op_private |= OPpTRANS_IDENTICAL;
2514 }
a0ed51b3
LW		 2515 }
2516
2517 while (t < tend || tfirst <= tlast) {
2518 /* see if we need more "t" chars */
2519 if (tfirst > tlast) {
2520 tfirst = (I32)utf8_to_uv(t, &ulen);
2521 t += ulen;
2522 if (t < tend && *t == 0xff) { /* illegal utf8 val indicates range */
2523 tlast = (I32)utf8_to_uv(++t, &ulen);
2524 t += ulen;
2525 }
2526 else
2527 tlast = tfirst;
2528 }
2529
2530 /* now see if we need more "r" chars */
2531 if (rfirst > rlast) {
2532 if (r < rend) {
2533 rfirst = (I32)utf8_to_uv(r, &ulen);
2534 r += ulen;
2535 if (r < rend && *r == 0xff) { /* illegal utf8 val indicates range */
2536 rlast = (I32)utf8_to_uv(++r, &ulen);
2537 r += ulen;
2538 }
2539 else
2540 rlast = rfirst;
2541 }
2542 else {
2543 if (!havefinal++)
2544 final = rlast;
2545 rfirst = rlast = 0xffffffff;
2546 }
2547 }
2548
2549 /* now see which range will peter our first, if either. */
2550 tdiff = tlast - tfirst;
2551 rdiff = rlast - rfirst;
2552
2553 if (tdiff <= rdiff)
2554 diff = tdiff;
2555 else
2556 diff = rdiff;
2557
2558 if (rfirst == 0xffffffff) {
2559 diff = tdiff; /* oops, pretend rdiff is infinite */
2560 if (diff > 0)
cea2e8a9 2561 Perl_sv_catpvf(aTHX_ listsv, "%04x\t%04x\tXXXX\n", tfirst, tlast);
a0ed51b3 2562 else
cea2e8a9 2563 Perl_sv_catpvf(aTHX_ listsv, "%04x\t\tXXXX\n", tfirst);
a0ed51b3
LW		 2564 }
2565 else {
2566 if (diff > 0)
cea2e8a9 2567 Perl_sv_catpvf(aTHX_ listsv, "%04x\t%04x\t%04x\n", tfirst, tfirst + diff, rfirst);
a0ed51b3 2568 else
cea2e8a9 2569 Perl_sv_catpvf(aTHX_ listsv, "%04x\t\t%04x\n", tfirst, rfirst);
a0ed51b3
LW		 2570
2571 if (rfirst + diff > max)
2572 max = rfirst + diff;
2573 rfirst += diff + 1;
2574 if (!grows) {
2575 if (rfirst <= 0x80)
2576 ;
2577 else if (rfirst <= 0x800)
2578 grows |= (tfirst < 0x80);
2579 else if (rfirst <= 0x10000)
2580 grows |= (tfirst < 0x800);
2581 else if (rfirst <= 0x200000)
2582 grows |= (tfirst < 0x10000);
2583 else if (rfirst <= 0x4000000)
2584 grows |= (tfirst < 0x200000);
2585 else if (rfirst <= 0x80000000)
2586 grows |= (tfirst < 0x4000000);
2587 }
2588 }
2589 tfirst += diff + 1;
2590 }
2591
2592 none = ++max;
2593 if (del)
2594 del = ++max;
2595
2596 if (max > 0xffff)
2597 bits = 32;
2598 else if (max > 0xff)
2599 bits = 16;
2600 else
2601 bits = 8;
2602
2603 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2604 SvREFCNT_dec(listsv);
2605 if (transv)
2606 SvREFCNT_dec(transv);
2607
2608 if (!del && havefinal)
2609 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5, newSViv((IV)final), 0);
2610
2611 if (grows && to_utf)
2612 o->op_private |= OPpTRANS_GROWS;
2613
2614 op_free(expr);
2615 op_free(repl);
2616 return o;
2617 }
2618
2619 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 2620 if (complement) {
2621 Zero(tbl, 256, short);
2622 for (i = 0; i < tlen; i++)
ec49126f 2623 tbl[t[i]] = -1;
79072805
LW		 2624 for (i = 0, j = 0; i < 256; i++) {
2625 if (!tbl[i]) {
2626 if (j >= rlen) {
a0ed51b3 2627 if (del)
79072805
LW		 2628 tbl[i] = -2;
2629 else if (rlen)
ec49126f 2630 tbl[i] = r[j-1];
79072805
LW		 2631 else
2632 tbl[i] = i;
2633 }
2634 else
ec49126f 2635 tbl[i] = r[j++];
79072805
LW		 2636 }
2637 }
2638 }
2639 else {
a0ed51b3 2640 if (!rlen && !del) {
79072805 2641 r = t; rlen = tlen;
5d06d08e 2642 if (!squash)
4757a243 2643 o->op_private |= OPpTRANS_IDENTICAL;
79072805
LW		 2644 }
2645 for (i = 0; i < 256; i++)
2646 tbl[i] = -1;
2647 for (i = 0, j = 0; i < tlen; i++,j++) {
2648 if (j >= rlen) {
a0ed51b3 2649 if (del) {
ec49126f 2650 if (tbl[t[i]] == -1)
2651 tbl[t[i]] = -2;
79072805
LW		 2652 continue;
2653 }
2654 --j;
2655 }
ec49126f 2656 if (tbl[t[i]] == -1)
2657 tbl[t[i]] = r[j];
79072805
LW		 2658 }
2659 }
2660 op_free(expr);
2661 op_free(repl);
2662
11343788 2663 return o;
79072805
LW		 2664}
2665
2666OP *
864dbfa3 2667Perl_newPMOP(pTHX_ I32 type, I32 flags)
79072805 2668{
11343788 2669 dTHR;
79072805
LW		 2670 PMOP *pmop;
2671
b7dc083c 2672 NewOp(1101, pmop, 1, PMOP);
79072805 2673 pmop->op_type = type;
22c35a8c 2674 pmop->op_ppaddr = PL_ppaddr[type];
79072805 2675 pmop->op_flags = flags;
c07a80fd 2676 pmop->op_private = 0 | (flags >> 8);
79072805 2677
3280af22 2678 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 2679 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 2680 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 2681 pmop->op_pmpermflags |= PMf_LOCALE;
2682 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2683
79072805 2684 /* link into pm list */
3280af22
NIS		 2685 if (type != OP_TRANS && PL_curstash) {
2686 pmop->op_pmnext = HvPMROOT(PL_curstash);
2687 HvPMROOT(PL_curstash) = pmop;
79072805
LW		 2688 }
2689
2690 return (OP*)pmop;
2691}
2692
2693OP *
864dbfa3 2694Perl_pmruntime(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2695{
5c0ca799 2696 dTHR;
79072805
LW		 2697 PMOP *pm;
2698 LOGOP *rcop;
ce862d02 2699 I32 repl_has_vars = 0;
79072805 2700
11343788
MB		 2701 if (o->op_type == OP_TRANS)
2702 return pmtrans(o, expr, repl);
79072805 2703
3280af22 2704 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2705 pm = (PMOP*)o;
79072805
LW		 2706
2707 if (expr->op_type == OP_CONST) {
463ee0b2 2708 STRLEN plen;
79072805 2709 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2710 char *p = SvPV(pat, plen);
11343788 2711 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2712 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2713 p = SvPV(pat, plen);
79072805
LW		 2714 pm->op_pmflags |= PMf_SKIPWHITE;
2715 }
cea2e8a9 2716 pm->op_pmregexp = CALLREGCOMP(aTHX_ p, p + plen, pm);
aeea060c 2717 if (strEQ("\\s+", pm->op_pmregexp->precomp))
85e6fe83 2718 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2719 op_free(expr);
2720 }
2721 else {
3280af22
NIS		 2722 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
2723 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2724 ? OP_REGCRESET
2725 : OP_REGCMAYBE),0,expr);
463ee0b2 2726
b7dc083c 2727 NewOp(1101, rcop, 1, LOGOP);
79072805 2728 rcop->op_type = OP_REGCOMP;
22c35a8c 2729 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 2730 rcop->op_first = scalar(expr);
3280af22 2731 rcop->op_flags |= ((PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2732 ? (OPf_SPECIAL | OPf_KIDS)
2733 : OPf_KIDS);
79072805 2734 rcop->op_private = 1;
11343788 2735 rcop->op_other = o;
79072805
LW		 2736
2737 /* establish postfix order */
3280af22 2738 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2739 LINKLIST(expr);
2740 rcop->op_next = expr;
2741 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2742 }
2743 else {
2744 rcop->op_next = LINKLIST(expr);
2745 expr->op_next = (OP*)rcop;
2746 }
79072805 2747
11343788 2748 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2749 }
2750
2751 if (repl) {
748a9306 2752 OP *curop;
0244c3a4 2753 if (pm->op_pmflags & PMf_EVAL) {
748a9306 2754 curop = 0;
0244c3a4
GS		 2755 if (PL_curcop->cop_line < PL_multi_end)
2756 PL_curcop->cop_line = PL_multi_end;
2757 }
554b3eca 2758#ifdef USE_THREADS
2faa37cc 2759 else if (repl->op_type == OP_THREADSV
554b3eca 2760 && strchr("&`'123456789+",
533c011a 2761 PL_threadsv_names[repl->op_targ]))
554b3eca
MB		 2762 {
2763 curop = 0;
2764 }
2765#endif /* USE_THREADS */
748a9306
LW		 2766 else if (repl->op_type == OP_CONST)
2767 curop = repl;
79072805 2768 else {
79072805
LW		 2769 OP *lastop = 0;
2770 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 2771 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
554b3eca 2772#ifdef USE_THREADS
ce862d02
IZ		 2773 if (curop->op_type == OP_THREADSV) {
2774 repl_has_vars = 1;
be949f6f 2775 if (strchr("&`'123456789+", curop->op_private))
ce862d02 2776 break;
554b3eca
MB		 2777 }
2778#else
79072805
LW		 2779 if (curop->op_type == OP_GV) {
2780 GV *gv = ((GVOP*)curop)->op_gv;
ce862d02 2781 repl_has_vars = 1;
93a17b20 2782 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 2783 break;
2784 }
554b3eca 2785#endif /* USE_THREADS */
79072805
LW		 2786 else if (curop->op_type == OP_RV2CV)
2787 break;
2788 else if (curop->op_type == OP_RV2SV ||
2789 curop->op_type == OP_RV2AV ||
2790 curop->op_type == OP_RV2HV ||
2791 curop->op_type == OP_RV2GV) {
2792 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2793 break;
2794 }
748a9306
LW		 2795 else if (curop->op_type == OP_PADSV ||
2796 curop->op_type == OP_PADAV ||
2797 curop->op_type == OP_PADHV ||
554b3eca 2798 curop->op_type == OP_PADANY) {
ce862d02 2799 repl_has_vars = 1;
748a9306 2800 }
1167e5da
SM		 2801 else if (curop->op_type == OP_PUSHRE)
2802 ; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 2803 else
2804 break;
2805 }
2806 lastop = curop;
2807 }
748a9306 2808 }
ce862d02
IZ		 2809 if (curop == repl
2810 && !(repl_has_vars
2811 && (!pm->op_pmregexp
2812 || pm->op_pmregexp->reganch & ROPT_EVAL_SEEN))) {
748a9306 2813 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2814 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2815 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2816 }
2817 else {
ce862d02
IZ		 2818 if (curop == repl && !pm->op_pmregexp) { /* Has variables. */
2819 pm->op_pmflags |= PMf_MAYBE_CONST;
2820 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2821 }
b7dc083c 2822 NewOp(1101, rcop, 1, LOGOP);
748a9306 2823 rcop->op_type = OP_SUBSTCONT;
22c35a8c 2824 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 2825 rcop->op_first = scalar(repl);
2826 rcop->op_flags |= OPf_KIDS;
2827 rcop->op_private = 1;
11343788 2828 rcop->op_other = o;
748a9306
LW		 2829
2830 /* establish postfix order */
2831 rcop->op_next = LINKLIST(repl);
2832 repl->op_next = (OP*)rcop;
2833
2834 pm->op_pmreplroot = scalar((OP*)rcop);
2835 pm->op_pmreplstart = LINKLIST(rcop);
2836 rcop->op_next = 0;
79072805
LW		 2837 }
2838 }
2839
2840 return (OP*)pm;
2841}
2842
2843OP *
864dbfa3 2844Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv)
79072805
LW		 2845{
2846 SVOP *svop;
b7dc083c 2847 NewOp(1101, svop, 1, SVOP);
79072805 2848 svop->op_type = type;
22c35a8c 2849 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2850 svop->op_sv = sv;
2851 svop->op_next = (OP*)svop;
2852 svop->op_flags = flags;
22c35a8c 2853 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2854 scalar((OP*)svop);
22c35a8c 2855 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2856 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2857 return CHECKOP(type, svop);
79072805
LW		 2858}
2859
2860OP *
864dbfa3 2861Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
79072805 2862{
11343788 2863 dTHR;
79072805 2864 GVOP *gvop;
b7dc083c 2865 NewOp(1101, gvop, 1, GVOP);
79072805 2866 gvop->op_type = type;
22c35a8c 2867 gvop->op_ppaddr = PL_ppaddr[type];
8990e307 2868 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2869 gvop->op_next = (OP*)gvop;
2870 gvop->op_flags = flags;
22c35a8c 2871 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2872 scalar((OP*)gvop);
22c35a8c 2873 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2874 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2875 return CHECKOP(type, gvop);
79072805
LW		 2876}
2877
2878OP *
864dbfa3 2879Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv)
79072805
LW		 2880{
2881 PVOP *pvop;
b7dc083c 2882 NewOp(1101, pvop, 1, PVOP);
79072805 2883 pvop->op_type = type;
22c35a8c 2884 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2885 pvop->op_pv = pv;
2886 pvop->op_next = (OP*)pvop;
2887 pvop->op_flags = flags;
22c35a8c 2888 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2889 scalar((OP*)pvop);
22c35a8c 2890 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2891 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2892 return CHECKOP(type, pvop);
79072805
LW		 2893}
2894
79072805 2895void
864dbfa3 2896Perl_package(pTHX_ OP *o)
79072805 2897{
11343788 2898 dTHR;
93a17b20 2899 SV *sv;
79072805 2900
3280af22
NIS		 2901 save_hptr(&PL_curstash);
2902 save_item(PL_curstname);
11343788 2903 if (o) {
463ee0b2
LW		 2904 STRLEN len;
2905 char *name;
11343788 2906 sv = cSVOPo->op_sv;
463ee0b2 2907 name = SvPV(sv, len);
3280af22
NIS		 2908 PL_curstash = gv_stashpvn(name,len,TRUE);
2909 sv_setpvn(PL_curstname, name, len);
11343788 2910 op_free(o);
93a17b20
LW		 2911 }
2912 else {
3280af22
NIS		 2913 sv_setpv(PL_curstname,"<none>");
2914 PL_curstash = Nullhv;
93a17b20 2915 }
7ad382f4 2916 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 2917 PL_copline = NOLINE;
2918 PL_expect = XSTATE;
79072805
LW		 2919}
2920
85e6fe83 2921void
864dbfa3 2922Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *id, OP *arg)
85e6fe83 2923{
a0d0e21e
LW		 2924 OP *pack;
2925 OP *meth;
2926 OP *rqop;
2927 OP *imop;
b1cb66bf 2928 OP *veop;
78ca652e 2929 GV *gv;
85e6fe83 2930
a0d0e21e 2931 if (id->op_type != OP_CONST)
cea2e8a9 2932 Perl_croak(aTHX_ "Module name must be constant");
85e6fe83 2933
b1cb66bf 2934 veop = Nullop;
2935
2936 if(version != Nullop) {
2937 SV *vesv = ((SVOP*)version)->op_sv;
2938
2939 if (arg == Nullop && !SvNIOK(vesv)) {
2940 arg = version;
2941 }
2942 else {
2943 OP *pack;
b1cb66bf 2944
2945 if (version->op_type != OP_CONST || !SvNIOK(vesv))
cea2e8a9 2946 Perl_croak(aTHX_ "Version number must be constant number");
b1cb66bf 2947
2948 /* Make copy of id so we don't free it twice */
2949 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2950
2951 /* Fake up a method call to VERSION */
b1cb66bf 2952 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2953 append_elem(OP_LIST,
2954 prepend_elem(OP_LIST, pack, list(version)),
f5d5a27c
CS		 2955 newSVOP(OP_METHOD_NAMED, 0,
2956 newSVpvn("VERSION", 7))));
b1cb66bf 2957 }
2958 }
aeea060c 2959
a0d0e21e 2960 /* Fake up an import/unimport */
4633a7c4
LW		 2961 if (arg && arg->op_type == OP_STUB)
2962 imop = arg; /* no import on explicit () */
b1cb66bf 2963 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2964 imop = Nullop; /* use 5.0; */
2965 }
4633a7c4
LW		 2966 else {
2967 /* Make copy of id so we don't free it twice */
2968 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4 2969 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2970 append_elem(OP_LIST,
2971 prepend_elem(OP_LIST, pack, list(arg)),
f5d5a27c
CS		 2972 newSVOP(OP_METHOD_NAMED, 0,
2973 aver ? newSVpvn("import", 6)
2974 : newSVpvn("unimport", 8))));
4633a7c4
LW		 2975 }
2976
78ca652e
GS		 2977 /* Fake up a require, handle override, if any */
2978 gv = gv_fetchpv("require", FALSE, SVt_PVCV);
2979 if (!(gv && GvIMPORTED_CV(gv)))
2980 gv = gv_fetchpv("CORE::GLOBAL::require", FALSE, SVt_PVCV);
2981
2982 if (gv && GvIMPORTED_CV(gv)) {
2983 rqop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
2984 append_elem(OP_LIST, id,
2985 scalar(newUNOP(OP_RV2CV, 0,
2986 newGVOP(OP_GV, 0,
2987 gv))))));
2988 }
2989 else {
2990 rqop = newUNOP(OP_REQUIRE, 0, id);
2991 }
a0d0e21e
LW		 2992
2993 /* Fake up the BEGIN {}, which does its thing immediately. */
09bef843 2994 newATTRSUB(floor,
79cb57f6 2995 newSVOP(OP_CONST, 0, newSVpvn("BEGIN", 5)),
4633a7c4 2996 Nullop,
09bef843 2997 Nullop,
a0d0e21e 2998 append_elem(OP_LINESEQ,
b1cb66bf 2999 append_elem(OP_LINESEQ,
3000 newSTATEOP(0, Nullch, rqop),
3001 newSTATEOP(0, Nullch, veop)),
a0d0e21e 3002 newSTATEOP(0, Nullch, imop) ));
85e6fe83 3003
3280af22
NIS		 3004 PL_copline = NOLINE;
3005 PL_expect = XSTATE;
85e6fe83
LW		 3006}
3007
79072805 3008OP *
864dbfa3 3009Perl_dofile(pTHX_ OP *term)
78ca652e
GS		 3010{
3011 OP *doop;
3012 GV *gv;
3013
3014 gv = gv_fetchpv("do", FALSE, SVt_PVCV);
3015 if (!(gv && GvIMPORTED_CV(gv)))
3016 gv = gv_fetchpv("CORE::GLOBAL::do", FALSE, SVt_PVCV);
3017
3018 if (gv && GvIMPORTED_CV(gv)) {
3019 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
3020 append_elem(OP_LIST, term,
3021 scalar(newUNOP(OP_RV2CV, 0,
3022 newGVOP(OP_GV, 0,
3023 gv))))));
3024 }
3025 else {
3026 doop = newUNOP(OP_DOFILE, 0, scalar(term));
3027 }
3028 return doop;
3029}
3030
3031OP *
864dbfa3 3032Perl_newSLICEOP(pTHX_ I32 flags, OP *subscript, OP *listval)
79072805
LW		 3033{
3034 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 3035 list(force_list(subscript)),
3036 list(force_list(listval)) );
79072805
LW		 3037}
3038
76e3520e 3039STATIC I32
cea2e8a9 3040S_list_assignment(pTHX_ register OP *o)
79072805 3041{
11343788 3042 if (!o)
79072805
LW		 3043 return TRUE;
3044
11343788
MB		 3045 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
3046 o = cUNOPo->op_first;
79072805 3047
11343788 3048 if (o->op_type == OP_COND_EXPR) {
1a67a97c
SM		 3049 I32 t = list_assignment(cLOGOPo->op_first->op_sibling);
3050 I32 f = list_assignment(cLOGOPo->op_first->op_sibling->op_sibling);
79072805
LW		 3051
3052 if (t && f)
3053 return TRUE;
3054 if (t || f)
3055 yyerror("Assignment to both a list and a scalar");
3056 return FALSE;
3057 }
3058
11343788
MB		 3059 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
3060 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
3061 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 3062 return TRUE;
3063
11343788 3064 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 3065 return TRUE;
3066
11343788 3067 if (o->op_type == OP_RV2SV)
79072805
LW		 3068 return FALSE;
3069
3070 return FALSE;
3071}
3072
3073OP *
864dbfa3 3074Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
79072805 3075{
11343788 3076 OP *o;
79072805 3077
a0d0e21e
LW		 3078 if (optype) {
3079 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
3080 return newLOGOP(optype, 0,
3081 mod(scalar(left), optype),
3082 newUNOP(OP_SASSIGN, 0, scalar(right)));
3083 }
3084 else {
3085 return newBINOP(optype, OPf_STACKED,
3086 mod(scalar(left), optype), scalar(right));
3087 }
3088 }
3089
79072805 3090 if (list_assignment(left)) {
6ee623d5 3091 dTHR;
3280af22
NIS		 3092 PL_modcount = 0;
3093 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 3094 left = mod(left, OP_AASSIGN);
3280af22
NIS		 3095 if (PL_eval_start)
3096 PL_eval_start = 0;
748a9306 3097 else {
a0d0e21e
LW		 3098 op_free(left);
3099 op_free(right);
3100 return Nullop;
3101 }
11343788 3102 o = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 3103 list(force_list(right)),
3104 list(force_list(left)) );
11343788 3105 o->op_private = 0 | (flags >> 8);
a0d0e21e 3106 if (!(left->op_private & OPpLVAL_INTRO)) {
79072805 3107 OP *curop;
11343788 3108 OP *lastop = o;
3280af22 3109 PL_generation++;
11343788 3110 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 3111 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805
LW		 3112 if (curop->op_type == OP_GV) {
3113 GV *gv = ((GVOP*)curop)->op_gv;
3280af22 3114 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
79072805 3115 break;
3280af22 3116 SvCUR(gv) = PL_generation;
79072805 3117 }
748a9306
LW		 3118 else if (curop->op_type == OP_PADSV ||
3119 curop->op_type == OP_PADAV ||
3120 curop->op_type == OP_PADHV ||
3121 curop->op_type == OP_PADANY) {
3280af22 3122 SV **svp = AvARRAY(PL_comppad_name);
8e07c86e 3123 SV *sv = svp[curop->op_targ];
3280af22 3124 if (SvCUR(sv) == PL_generation)
748a9306 3125 break;
3280af22 3126 SvCUR(sv) = PL_generation; /* (SvCUR not used any more) */
748a9306 3127 }
79072805
LW		 3128 else if (curop->op_type == OP_RV2CV)
3129 break;
3130 else if (curop->op_type == OP_RV2SV ||
3131 curop->op_type == OP_RV2AV ||
3132 curop->op_type == OP_RV2HV ||
3133 curop->op_type == OP_RV2GV) {
3134 if (lastop->op_type != OP_GV) /* funny deref? */
3135 break;
3136 }
1167e5da
SM		 3137 else if (curop->op_type == OP_PUSHRE) {
3138 if (((PMOP*)curop)->op_pmreplroot) {
3139 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
3280af22 3140 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
1167e5da 3141 break;
3280af22 3142 SvCUR(gv) = PL_generation;
1167e5da
SM		 3143 }
3144 }
79072805
LW		 3145 else
3146 break;
3147 }
3148 lastop = curop;
3149 }
11343788
MB		 3150 if (curop != o)
3151 o->op_private = OPpASSIGN_COMMON;
79072805 3152 }
c07a80fd 3153 if (right && right->op_type == OP_SPLIT) {
3154 OP* tmpop;
3155 if ((tmpop = ((LISTOP*)right)->op_first) &&
3156 tmpop->op_type == OP_PUSHRE)
3157 {
3158 PMOP *pm = (PMOP*)tmpop;
3159 if (left->op_type == OP_RV2AV &&
3160 !(left->op_private & OPpLVAL_INTRO) &&
11343788 3161 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 3162 {
3163 tmpop = ((UNOP*)left)->op_first;
3164 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
3165 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
3166 pm->op_pmflags |= PMf_ONCE;
11343788 3167 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 3168 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
3169 tmpop->op_sibling = Nullop; /* don't free split */
3170 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 3171 op_free(o); /* blow off assign */
54310121 3172 right->op_flags &= ~OPf_WANT;
a5f75d66 3173 /* "I don't know and I don't care." */
c07a80fd 3174 return right;
3175 }
3176 }
3177 else {
3280af22 3178 if (PL_modcount < 10000 &&
c07a80fd 3179 ((LISTOP*)right)->op_last->op_type == OP_CONST)
3180 {
3181 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
3182 if (SvIVX(sv) == 0)
3280af22 3183 sv_setiv(sv, PL_modcount+1);
c07a80fd 3184 }
3185 }
3186 }
3187 }
11343788 3188 return o;
79072805
LW		 3189 }
3190 if (!right)
3191 right = newOP(OP_UNDEF, 0);
3192 if (right->op_type == OP_READLINE) {
3193 right->op_flags |= OPf_STACKED;
463ee0b2 3194 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 3195 }
a0d0e21e 3196 else {
3280af22 3197 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 3198 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 3199 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 3200 if (PL_eval_start)
3201 PL_eval_start = 0;
748a9306 3202 else {
11343788 3203 op_free(o);
a0d0e21e
LW		 3204 return Nullop;
3205 }
3206 }
11343788 3207 return o;
79072805
LW		 3208}
3209
3210OP *
864dbfa3 3211Perl_newSTATEOP(pTHX_ I32 flags, char *label, OP *o)
79072805 3212{
11343788 3213 dTHR;
bbce6d69 3214 U32 seq = intro_my();
79072805
LW		 3215 register COP *cop;
3216
b7dc083c 3217 NewOp(1101, cop, 1, COP);
3280af22 3218 if (PERLDB_LINE && PL_curcop->cop_line && PL_curstash != PL_debstash) {
8990e307 3219 cop->op_type = OP_DBSTATE;
22c35a8c 3220 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 3221 }
3222 else {
3223 cop->op_type = OP_NEXTSTATE;
22c35a8c 3224 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 3225 }
79072805 3226 cop->op_flags = flags;
a0ed51b3 3227 cop->op_private = (PL_hints & HINT_UTF8);
ff0cee69 3228#ifdef NATIVE_HINTS
3229 cop->op_private |= NATIVE_HINTS;
3230#endif
e24b16f9 3231 PL_compiling.op_private = cop->op_private;
79072805
LW		 3232 cop->op_next = (OP*)cop;
3233
463ee0b2
LW		 3234 if (label) {
3235 cop->cop_label = label;
3280af22 3236 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 3237 }
bbce6d69 3238 cop->cop_seq = seq;
3280af22 3239 cop->cop_arybase = PL_curcop->cop_arybase;
0453d815 3240 if (specialWARN(PL_curcop->cop_warnings))
599cee73
PM		 3241 cop->cop_warnings = PL_curcop->cop_warnings ;
3242 else
3243 cop->cop_warnings = newSVsv(PL_curcop->cop_warnings) ;
3244
79072805 3245
3280af22
NIS		 3246 if (PL_copline == NOLINE)
3247 cop->cop_line = PL_curcop->cop_line;
79072805 3248 else {
3280af22
NIS		 3249 cop->cop_line = PL_copline;
3250 PL_copline = NOLINE;
79072805 3251 }
3280af22
NIS		 3252 cop->cop_filegv = (GV*)SvREFCNT_inc(PL_curcop->cop_filegv);
3253 cop->cop_stash = PL_curstash;
79072805 3254
3280af22
NIS		 3255 if (PERLDB_LINE && PL_curstash != PL_debstash) {
3256 SV **svp = av_fetch(GvAV(PL_curcop->cop_filegv),(I32)cop->cop_line, FALSE);
3257 if (svp && *svp != &PL_sv_undef && !SvIOK(*svp)) {
a0d0e21e 3258 (void)SvIOK_on(*svp);
a5f75d66 3259 SvIVX(*svp) = 1;
93a17b20
LW		 3260 SvSTASH(*svp) = (HV*)cop;
3261 }
3262 }
3263
11343788 3264 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3265}
3266
bbce6d69 3267/* "Introduce" my variables to visible status. */
3268U32
864dbfa3 3269Perl_intro_my(pTHX)
bbce6d69 3270{
3271 SV **svp;
3272 SV *sv;
3273 I32 i;
3274
3280af22
NIS		 3275 if (! PL_min_intro_pending)
3276 return PL_cop_seqmax;
bbce6d69 3277
3280af22
NIS		 3278 svp = AvARRAY(PL_comppad_name);
3279 for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
3280 if ((sv = svp[i]) && sv != &PL_sv_undef && !SvIVX(sv)) {
c53d7c7d 3281 SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */
65202027 3282 SvNVX(sv) = (NV)PL_cop_seqmax;
bbce6d69 3283 }
3284 }
3280af22
NIS		 3285 PL_min_intro_pending = 0;
3286 PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
3287 return PL_cop_seqmax++;
bbce6d69 3288}
3289
79072805 3290OP *
864dbfa3 3291Perl_newLOGOP(pTHX_ I32 type, I32 flags, OP *first, OP *other)
79072805 3292{
883ffac3
CS		 3293 return new_logop(type, flags, &first, &other);
3294}
3295
3bd495df 3296STATIC OP *
cea2e8a9 3297S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
883ffac3 3298{
11343788 3299 dTHR;
79072805 3300 LOGOP *logop;
11343788 3301 OP *o;
883ffac3
CS		 3302 OP *first = *firstp;
3303 OP *other = *otherp;
79072805 3304
a0d0e21e
LW		 3305 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
3306 return newBINOP(type, flags, scalar(first), scalar(other));
3307
8990e307 3308 scalarboolean(first);
79072805
LW		 3309 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
3310 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
3311 if (type == OP_AND || type == OP_OR) {
3312 if (type == OP_AND)
3313 type = OP_OR;
3314 else
3315 type = OP_AND;
11343788 3316 o = first;
883ffac3 3317 first = *firstp = cUNOPo->op_first;
11343788
MB		 3318 if (o->op_next)
3319 first->op_next = o->op_next;
3320 cUNOPo->op_first = Nullop;
3321 op_free(o);
79072805
LW		 3322 }
3323 }
3324 if (first->op_type == OP_CONST) {
599cee73 3325 if (ckWARN(WARN_PRECEDENCE) && (first->op_private & OPpCONST_BARE))
cea2e8a9 3326 Perl_warner(aTHX_ WARN_PRECEDENCE, "Probable precedence problem on %s",
22c35a8c 3327 PL_op_desc[type]);
79072805
LW		 3328 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
3329 op_free(first);
883ffac3 3330 *firstp = Nullop;
79072805
LW		 3331 return other;
3332 }
3333 else {
3334 op_free(other);
883ffac3 3335 *otherp = Nullop;
79072805
LW		 3336 return first;
3337 }
3338 }
3339 else if (first->op_type == OP_WANTARRAY) {
3340 if (type == OP_AND)
3341 list(other);
3342 else
3343 scalar(other);
3344 }
599cee73 3345 else if (ckWARN(WARN_UNSAFE) && (first->op_flags & OPf_KIDS)) {
a6006777 3346 OP *k1 = ((UNOP*)first)->op_first;
3347 OP *k2 = k1->op_sibling;
3348 OPCODE warnop = 0;
3349 switch (first->op_type)
3350 {
3351 case OP_NULL:
3352 if (k2 && k2->op_type == OP_READLINE
3353 && (k2->op_flags & OPf_STACKED)
55d729e4 3354 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
a6006777 3355 warnop = k2->op_type;
3356 break;
3357
3358 case OP_SASSIGN:
68dc0745 3359 if (k1->op_type == OP_READDIR
3360 || k1->op_type == OP_GLOB
3361 || k1->op_type == OP_EACH)
a6006777 3362 warnop = k1->op_type;
3363 break;
3364 }
8ebc5c01 3365 if (warnop) {
3280af22
NIS		 3366 line_t oldline = PL_curcop->cop_line;
3367 PL_curcop->cop_line = PL_copline;
cea2e8a9 3368 Perl_warner(aTHX_ WARN_UNSAFE,
599cee73 3369 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 3370 PL_op_desc[warnop],
68dc0745 3371 ((warnop == OP_READLINE || warnop == OP_GLOB)
3372 ? " construct" : "() operator"));
3280af22 3373 PL_curcop->cop_line = oldline;
8ebc5c01 3374 }
a6006777 3375 }
79072805
LW		 3376
3377 if (!other)
3378 return first;
3379
a0d0e21e
LW		 3380 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
3381 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
3382
b7dc083c 3383 NewOp(1101, logop, 1, LOGOP);
79072805
LW		 3384
3385 logop->op_type = type;
22c35a8c 3386 logop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3387 logop->op_first = first;
3388 logop->op_flags = flags | OPf_KIDS;
3389 logop->op_other = LINKLIST(other);
c07a80fd 3390 logop->op_private = 1 | (flags >> 8);
79072805
LW		 3391
3392 /* establish postfix order */
3393 logop->op_next = LINKLIST(first);
3394 first->op_next = (OP*)logop;
3395 first->op_sibling = other;
3396
11343788
MB		 3397 o = newUNOP(OP_NULL, 0, (OP*)logop);
3398 other->op_next = o;
79072805 3399
11343788 3400 return o;
79072805
LW		 3401}
3402
3403OP *
864dbfa3 3404Perl_newCONDOP(pTHX_ I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 3405{
11343788 3406 dTHR;
1a67a97c
SM		 3407 LOGOP *logop;
3408 OP *start;
11343788 3409 OP *o;
79072805 3410
b1cb66bf 3411 if (!falseop)
3412 return newLOGOP(OP_AND, 0, first, trueop);
3413 if (!trueop)
3414 return newLOGOP(OP_OR, 0, first, falseop);
79072805 3415
8990e307 3416 scalarboolean(first);
79072805
LW		 3417 if (first->op_type == OP_CONST) {
3418 if (SvTRUE(((SVOP*)first)->op_sv)) {
3419 op_free(first);
b1cb66bf 3420 op_free(falseop);
3421 return trueop;
79072805
LW		 3422 }
3423 else {
3424 op_free(first);
b1cb66bf 3425 op_free(trueop);
3426 return falseop;
79072805
LW		 3427 }
3428 }
3429 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 3430 list(trueop);
3431 scalar(falseop);
79072805 3432 }
1a67a97c
SM		 3433 NewOp(1101, logop, 1, LOGOP);
3434 logop->op_type = OP_COND_EXPR;
3435 logop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
3436 logop->op_first = first;
3437 logop->op_flags = flags | OPf_KIDS;
3438 logop->op_private = 1 | (flags >> 8);
3439 logop->op_other = LINKLIST(trueop);
3440 logop->op_next = LINKLIST(falseop);
79072805 3441
79072805
LW		 3442
3443 /* establish postfix order */
1a67a97c
SM		 3444 start = LINKLIST(first);
3445 first->op_next = (OP*)logop;
79072805 3446
b1cb66bf 3447 first->op_sibling = trueop;
3448 trueop->op_sibling = falseop;
1a67a97c 3449 o = newUNOP(OP_NULL, 0, (OP*)logop);
79072805 3450
1a67a97c 3451 trueop->op_next = falseop->op_next = o;
79072805 3452
1a67a97c 3453 o->op_next = start;
11343788 3454 return o;
79072805
LW		 3455}
3456
3457OP *
864dbfa3 3458Perl_newRANGE(pTHX_ I32 flags, OP *left, OP *right)
79072805 3459{
b35b2403 3460 dTHR;
1a67a97c 3461 LOGOP *range;
79072805
LW		 3462 OP *flip;
3463 OP *flop;
1a67a97c 3464 OP *leftstart;
11343788 3465 OP *o;
79072805 3466
1a67a97c 3467 NewOp(1101, range, 1, LOGOP);
79072805 3468
1a67a97c
SM		 3469 range->op_type = OP_RANGE;
3470 range->op_ppaddr = PL_ppaddr[OP_RANGE];
3471 range->op_first = left;
3472 range->op_flags = OPf_KIDS;
3473 leftstart = LINKLIST(left);
3474 range->op_other = LINKLIST(right);
3475 range->op_private = 1 | (flags >> 8);
79072805
LW		 3476
3477 left->op_sibling = right;
3478
1a67a97c
SM		 3479 range->op_next = (OP*)range;
3480 flip = newUNOP(OP_FLIP, flags, (OP*)range);
79072805 3481 flop = newUNOP(OP_FLOP, 0, flip);
11343788 3482 o = newUNOP(OP_NULL, 0, flop);
79072805 3483 linklist(flop);
1a67a97c 3484 range->op_next = leftstart;
79072805
LW		 3485
3486 left->op_next = flip;
3487 right->op_next = flop;
3488
1a67a97c
SM		 3489 range->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
3490 sv_upgrade(PAD_SV(range->op_targ), SVt_PVNV);
ed6116ce 3491 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 3492 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
3493
3494 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3495 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3496
11343788 3497 flip->op_next = o;
79072805 3498 if (!flip->op_private || !flop->op_private)
11343788 3499 linklist(o); /* blow off optimizer unless constant */
79072805 3500
11343788 3501 return o;
79072805
LW		 3502}
3503
3504OP *
864dbfa3 3505Perl_newLOOPOP(pTHX_ I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 3506{
11343788 3507 dTHR;
463ee0b2 3508 OP* listop;
11343788 3509 OP* o;
463ee0b2 3510 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 3511 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 3512
463ee0b2
LW		 3513 if (expr) {
3514 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
3515 return block; /* do {} while 0 does once */
fb73857a 3516 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3517 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 3518 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3519 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3520 } else if (expr->op_flags & OPf_KIDS) {
3521 OP *k1 = ((UNOP*)expr)->op_first;
3522 OP *k2 = (k1) ? k1->op_sibling : NULL;
3523 switch (expr->op_type) {
3524 case OP_NULL:
3525 if (k2 && k2->op_type == OP_READLINE
3526 && (k2->op_flags & OPf_STACKED)
3527 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3528 expr = newUNOP(OP_DEFINED, 0, expr);
3529 break;
3530
3531 case OP_SASSIGN:
3532 if (k1->op_type == OP_READDIR
3533 || k1->op_type == OP_GLOB
3534 || k1->op_type == OP_EACH)
3535 expr = newUNOP(OP_DEFINED, 0, expr);
3536 break;
3537 }
774d564b 3538 }
463ee0b2 3539 }
93a17b20 3540
8990e307 3541 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 3542 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 3543
883ffac3
CS		 3544 if (listop)
3545 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 3546
11343788
MB		 3547 if (once && o != listop)
3548 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 3549
11343788
MB		 3550 if (o == listop)
3551 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 3552
11343788
MB		 3553 o->op_flags |= flags;
3554 o = scope(o);
3555 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
3556 return o;
79072805
LW		 3557}
3558
3559OP *
864dbfa3 3560Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805 3561{
11343788 3562 dTHR;
79072805
LW		 3563 OP *redo;
3564 OP *next = 0;
3565 OP *listop;
11343788 3566 OP *o;
79072805
LW		 3567 OP *condop;
3568
fb73857a 3569 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3570 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 3571 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3572 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3573 } else if (expr && (expr->op_flags & OPf_KIDS)) {
3574 OP *k1 = ((UNOP*)expr)->op_first;
3575 OP *k2 = (k1) ? k1->op_sibling : NULL;
3576 switch (expr->op_type) {
3577 case OP_NULL:
3578 if (k2 && k2->op_type == OP_READLINE
3579 && (k2->op_flags & OPf_STACKED)
3580 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3581 expr = newUNOP(OP_DEFINED, 0, expr);
3582 break;
3583
3584 case OP_SASSIGN:
3585 if (k1->op_type == OP_READDIR
3586 || k1->op_type == OP_GLOB
3587 || k1->op_type == OP_EACH)
3588 expr = newUNOP(OP_DEFINED, 0, expr);
3589 break;
3590 }
748a9306 3591 }
79072805
LW		 3592
3593 if (!block)
3594 block = newOP(OP_NULL, 0);
3595
3596 if (cont)
3597 next = LINKLIST(cont);
fb73857a 3598 if (expr) {
79072805 3599 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
fb73857a 3600 if ((line_t)whileline != NOLINE) {
3280af22 3601 PL_copline = whileline;
fb73857a 3602 cont = append_elem(OP_LINESEQ, cont,
3603 newSTATEOP(0, Nullch, Nullop));
3604 }
3605 }
79072805 3606
463ee0b2 3607 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 3608 redo = LINKLIST(listop);
3609
3610 if (expr) {
3280af22 3611 PL_copline = whileline;
883ffac3
CS		 3612 scalar(listop);
3613 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 3614 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 3615 op_free(expr); /* oops, it's a while (0) */
463ee0b2 3616 op_free((OP*)loop);
883ffac3 3617 return Nullop; /* listop already freed by new_logop */
463ee0b2 3618 }
883ffac3
CS		 3619 if (listop)
3620 ((LISTOP*)listop)->op_last->op_next = condop =
3621 (o == listop ? redo : LINKLIST(o));
79072805
LW		 3622 if (!next)
3623 next = condop;
3624 }
3625 else
11343788 3626 o = listop;
79072805
LW		 3627
3628 if (!loop) {
b7dc083c 3629 NewOp(1101,loop,1,LOOP);
79072805 3630 loop->op_type = OP_ENTERLOOP;
22c35a8c 3631 loop->op_ppaddr = PL_ppaddr[OP_ENTERLOOP];
79072805
LW		 3632 loop->op_private = 0;
3633 loop->op_next = (OP*)loop;
3634 }
3635
11343788 3636 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 3637
3638 loop->op_redoop = redo;
11343788 3639 loop->op_lastop = o;
79072805
LW		 3640
3641 if (next)
3642 loop->op_nextop = next;
3643 else
11343788 3644 loop->op_nextop = o;
79072805 3645
11343788
MB		 3646 o->op_flags |= flags;
3647 o->op_private |= (flags >> 8);
3648 return o;
79072805
LW		 3649}
3650
3651OP *
864dbfa3 3652Perl_newFOROP(pTHX_ I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
79072805
LW		 3653{
3654 LOOP *loop;
b7dc083c 3655 LOOP *tmp;
fb73857a 3656 OP *wop;
85e6fe83 3657 int padoff = 0;
4633a7c4 3658 I32 iterflags = 0;
79072805 3659
79072805 3660 if (sv) {
85e6fe83 3661 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306 3662 sv->op_type = OP_RV2GV;
22c35a8c 3663 sv->op_ppaddr = PL_ppaddr[OP_RV2GV];
79072805 3664 }
85e6fe83
LW		 3665 else if (sv->op_type == OP_PADSV) { /* private variable */
3666 padoff = sv->op_targ;
3667 op_free(sv);
3668 sv = Nullop;
3669 }
54b9620d
MB		 3670 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
3671 padoff = sv->op_targ;
3672 iterflags |= OPf_SPECIAL;
3673 op_free(sv);
3674 sv = Nullop;
3675 }
79072805 3676 else
cea2e8a9 3677 Perl_croak(aTHX_ "Can't use %s for loop variable", PL_op_desc[sv->op_type]);
79072805
LW		 3678 }
3679 else {
54b9620d
MB		 3680#ifdef USE_THREADS
3681 padoff = find_threadsv("_");
3682 iterflags |= OPf_SPECIAL;
3683#else
3280af22 3684 sv = newGVOP(OP_GV, 0, PL_defgv);
54b9620d 3685#endif
79072805 3686 }
5f05dabc 3687 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 3688 expr = mod(force_list(scalar(ref(expr, OP_ITER))), OP_GREPSTART);
4633a7c4
LW		 3689 iterflags |= OPf_STACKED;
3690 }
89ea2908
GA		 3691 else if (expr->op_type == OP_NULL &&
3692 (expr->op_flags & OPf_KIDS) &&
3693 ((BINOP*)expr)->op_first->op_type == OP_FLOP)
3694 {
3695 /* Basically turn for($x..$y) into the same as for($x,$y), but we
3696 * set the STACKED flag to indicate that these values are to be
3697 * treated as min/max values by 'pp_iterinit'.
3698 */
3699 UNOP* flip = (UNOP*)((UNOP*)((BINOP*)expr)->op_first)->op_first;
1a67a97c 3700 LOGOP* range = (LOGOP*) flip->op_first;
89ea2908
GA		 3701 OP* left = range->op_first;
3702 OP* right = left->op_sibling;
5152d7c7 3703 LISTOP* listop;
89ea2908
GA		 3704
3705 range->op_flags &= ~OPf_KIDS;
3706 range->op_first = Nullop;
3707
5152d7c7 3708 listop = (LISTOP*)newLISTOP(OP_LIST, 0, left, right);
1a67a97c
SM		 3709 listop->op_first->op_next = range->op_next;
3710 left->op_next = range->op_other;
5152d7c7
GS		 3711 right->op_next = (OP*)listop;
3712 listop->op_next = listop->op_first;
89ea2908
GA		 3713
3714 op_free(expr);
5152d7c7 3715 expr = (OP*)(listop);
89ea2908
GA		 3716 null(expr);
3717 iterflags |= OPf_STACKED;
3718 }
3719 else {
3720 expr = mod(force_list(expr), OP_GREPSTART);
3721 }
3722
3723
4633a7c4 3724 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
89ea2908 3725 append_elem(OP_LIST, expr, scalar(sv))));
85e6fe83 3726 assert(!loop->op_next);
b7dc083c
NIS		 3727#ifdef PL_OP_SLAB_ALLOC
3728 NewOp(1234,tmp,1,LOOP);
3729 Copy(loop,tmp,1,LOOP);
3730 loop = tmp;
3731#else
85e6fe83 3732 Renew(loop, 1, LOOP);
b7dc083c 3733#endif
85e6fe83 3734 loop->op_targ = padoff;
fb73857a 3735 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont);
3280af22 3736 PL_copline = forline;
fb73857a 3737 return newSTATEOP(0, label, wop);
79072805
LW		 3738}
3739
8990e307 3740OP*
864dbfa3 3741Perl_newLOOPEX(pTHX_ I32 type, OP *label)
8990e307 3742{
11343788
MB		 3743 dTHR;
3744 OP *o;
2d8e6c8d
GS		 3745 STRLEN n_a;
3746
8990e307 3747 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 3748 /* "last()" means "last" */
3749 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
3750 o = newOP(type, OPf_SPECIAL);
3751 else {
3752 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
2d8e6c8d 3753 ? SvPVx(((SVOP*)label)->op_sv, n_a)
cdaebead
MB		 3754 : ""));
3755 }
8990e307
LW		 3756 op_free(label);
3757 }
3758 else {
a0d0e21e
LW		 3759 if (label->op_type == OP_ENTERSUB)
3760 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 3761 o = newUNOP(type, OPf_STACKED, label);
8990e307 3762 }
3280af22 3763 PL_hints |= HINT_BLOCK_SCOPE;
11343788 3764 return o;
8990e307
LW		 3765}
3766
79072805 3767void
864dbfa3 3768Perl_cv_undef(pTHX_ CV *cv)
79072805 3769{
11343788
MB		 3770 dTHR;
3771#ifdef USE_THREADS
e858de61
MB		 3772 if (CvMUTEXP(cv)) {
3773 MUTEX_DESTROY(CvMUTEXP(cv));
3774 Safefree(CvMUTEXP(cv));
3775 CvMUTEXP(cv) = 0;
3776 }
11343788
MB		 3777#endif /* USE_THREADS */
3778
a0d0e21e 3779 if (!CvXSUB(cv) && CvROOT(cv)) {
11343788
MB		 3780#ifdef USE_THREADS
3781 if (CvDEPTH(cv) || (CvOWNER(cv) && CvOWNER(cv) != thr))
cea2e8a9 3782 Perl_croak(aTHX_ "Can't undef active subroutine");
11343788 3783#else
a0d0e21e 3784 if (CvDEPTH(cv))
cea2e8a9 3785 Perl_croak(aTHX_ "Can't undef active subroutine");
11343788 3786#endif /* USE_THREADS */
8990e307 3787 ENTER;
a0d0e21e 3788
3280af22
NIS		 3789 SAVESPTR(PL_curpad);
3790 PL_curpad = 0;
a0d0e21e 3791
a5f75d66 3792 if (!CvCLONED(cv))
748a9306 3793 op_free(CvROOT(cv));
79072805 3794 CvROOT(cv) = Nullop;
8990e307 3795 LEAVE;
79072805 3796 }
1d5db326 3797 SvPOK_off((SV*)cv); /* forget prototype */
44a8e56a 3798 CvFLAGS(cv) = 0;
8e07c86e
AD		 3799 SvREFCNT_dec(CvGV(cv));
3800 CvGV(cv) = Nullgv;
3801 SvREFCNT_dec(CvOUTSIDE(cv));
3802 CvOUTSIDE(cv) = Nullcv;
3803 if (CvPADLIST(cv)) {
8ebc5c01 3804 /* may be during global destruction */
3805 if (SvREFCNT(CvPADLIST(cv))) {
93965878 3806 I32 i = AvFILLp(CvPADLIST(cv));
8ebc5c01 3807 while (i >= 0) {
3808 SV** svp = av_fetch(CvPADLIST(cv), i--, FALSE);
46fc3d4c 3809 SV* sv = svp ? *svp : Nullsv;
3810 if (!sv)
3811 continue;
3280af22
NIS		 3812 if (sv == (SV*)PL_comppad_name)
3813 PL_comppad_name = Nullav;
3814 else if (sv == (SV*)PL_comppad) {
3815 PL_comppad = Nullav;
3816 PL_curpad = Null(SV**);
46fc3d4c 3817 }
3818 SvREFCNT_dec(sv);
8ebc5c01 3819 }
3820 SvREFCNT_dec((SV*)CvPADLIST(cv));
8e07c86e 3821 }
8e07c86e
AD		 3822 CvPADLIST(cv) = Nullav;
3823 }
79072805
LW		 3824}
3825
5f05dabc 3826#ifdef DEBUG_CLOSURES
76e3520e 3827STATIC void
ba106d47 3828cv_dump(CV *cv)
5f05dabc 3829{
3830 CV *outside = CvOUTSIDE(cv);
3831 AV* padlist = CvPADLIST(cv);
4fdae800 3832 AV* pad_name;
3833 AV* pad;
3834 SV** pname;
3835 SV** ppad;
5f05dabc 3836 I32 ix;
3837
fb73857a 3838 PerlIO_printf(Perl_debug_log, "\tCV=0x%lx (%s), OUTSIDE=0x%lx (%s)\n",
ab50184a
CS		 3839 cv,
3840 (CvANON(cv) ? "ANON"
6b88bc9c 3841 : (cv == PL_main_cv) ? "MAIN"
33b8ce05 3842 : CvUNIQUE(cv) ? "UNIQUE"
44a8e56a 3843 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
ab50184a
CS		 3844 outside,
3845 (!outside ? "null"
3846 : CvANON(outside) ? "ANON"
6b88bc9c 3847 : (outside == PL_main_cv) ? "MAIN"
07055b4c 3848 : CvUNIQUE(outside) ? "UNIQUE"
44a8e56a 3849 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
5f05dabc 3850
4fdae800 3851 if (!padlist)
3852 return;
3853
3854 pad_name = (AV*)*av_fetch(padlist, 0, FALSE);
3855 pad = (AV*)*av_fetch(padlist, 1, FALSE);
3856 pname = AvARRAY(pad_name);
3857 ppad = AvARRAY(pad);
3858
93965878 3859 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
5f05dabc 3860 if (SvPOK(pname[ix]))
fb73857a 3861 PerlIO_printf(Perl_debug_log, "\t%4d. 0x%lx (%s\"%s\" %ld-%ld)\n",
4fdae800 3862 ix, ppad[ix],
3863 SvFAKE(pname[ix]) ? "FAKE " : "",
3864 SvPVX(pname[ix]),
ab50184a
CS		 3865 (long)I_32(SvNVX(pname[ix])),
3866 (long)SvIVX(pname[ix]));
5f05dabc 3867 }
3868}
3869#endif /* DEBUG_CLOSURES */
3870
76e3520e 3871STATIC CV *
cea2e8a9 3872S_cv_clone2(pTHX_ CV *proto, CV *outside)
748a9306 3873{
11343788 3874 dTHR;
748a9306
LW		 3875 AV* av;
3876 I32 ix;
3877 AV* protopadlist = CvPADLIST(proto);
3878 AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
3879 AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
5f05dabc 3880 SV** pname = AvARRAY(protopad_name);
3881 SV** ppad = AvARRAY(protopad);
93965878
NIS		 3882 I32 fname = AvFILLp(protopad_name);
3883 I32 fpad = AvFILLp(protopad);
748a9306
LW		 3884 AV* comppadlist;
3885 CV* cv;
3886
07055b4c
CS		 3887 assert(!CvUNIQUE(proto));
3888
748a9306 3889 ENTER;
3280af22
NIS		 3890 SAVESPTR(PL_curpad);
3891 SAVESPTR(PL_comppad);
3892 SAVESPTR(PL_comppad_name);
3893 SAVESPTR(PL_compcv);
748a9306 3894
3280af22 3895 cv = PL_compcv = (CV*)NEWSV(1104,0);
fa83b5b6 3896 sv_upgrade((SV *)cv, SvTYPE(proto));
a5f75d66 3897 CvCLONED_on(cv);
5f05dabc 3898 if (CvANON(proto))
3899 CvANON_on(cv);
748a9306 3900
11343788 3901#ifdef USE_THREADS
12ca11f6 3902 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 3903 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 3904 CvOWNER(cv) = 0;
3905#endif /* USE_THREADS */
748a9306 3906 CvFILEGV(cv) = CvFILEGV(proto);
44a8e56a 3907 CvGV(cv) = (GV*)SvREFCNT_inc(CvGV(proto));
748a9306
LW		 3908 CvSTASH(cv) = CvSTASH(proto);
3909 CvROOT(cv) = CvROOT(proto);
3910 CvSTART(cv) = CvSTART(proto);
5f05dabc 3911 if (outside)
3912 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
748a9306 3913
68dc0745 3914 if (SvPOK(proto))
3915 sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto));
3916
3280af22 3917 PL_comppad_name = newAV();
46fc3d4c 3918 for (ix = fname; ix >= 0; ix--)
3280af22 3919 av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix]));
748a9306 3920
3280af22 3921 PL_comppad = newAV();
748a9306
LW		 3922
3923 comppadlist = newAV();
3924 AvREAL_off(comppadlist);
3280af22
NIS		 3925 av_store(comppadlist, 0, (SV*)PL_comppad_name);
3926 av_store(comppadlist, 1, (SV*)PL_comppad);
748a9306 3927 CvPADLIST(cv) = comppadlist;
3280af22
NIS		 3928 av_fill(PL_comppad, AvFILLp(protopad));
3929 PL_curpad = AvARRAY(PL_comppad);
748a9306
LW		 3930
3931 av = newAV(); /* will be @_ */
3932 av_extend(av, 0);
3280af22 3933 av_store(PL_comppad, 0, (SV*)av);
748a9306
LW		 3934 AvFLAGS(av) = AVf_REIFY;
3935
9607fc9c 3936 for (ix = fpad; ix > 0; ix--) {
3937 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
3280af22 3938 if (namesv && namesv != &PL_sv_undef) {
aa689395 3939 char *name = SvPVX(namesv); /* XXX */
3940 if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */
3941 I32 off = pad_findlex(name, ix, SvIVX(namesv),
2680586e 3942 CvOUTSIDE(cv), cxstack_ix, 0, 0);
5f05dabc 3943 if (!off)
3280af22 3944 PL_curpad[ix] = SvREFCNT_inc(ppad[ix]);
5f05dabc 3945 else if (off != ix)
cea2e8a9 3946 Perl_croak(aTHX_ "panic: cv_clone: %s", name);
748a9306
LW		 3947 }
3948 else { /* our own lexical */
aa689395 3949 SV* sv;
5f05dabc 3950 if (*name == '&') {
3951 /* anon code -- we'll come back for it */
3952 sv = SvREFCNT_inc(ppad[ix]);
3953 }
3954 else if (*name == '@')
3955 sv = (SV*)newAV();
748a9306 3956 else if (*name == '%')
5f05dabc 3957 sv = (SV*)newHV();
748a9306 3958 else
5f05dabc 3959 sv = NEWSV(0,0);
3960 if (!SvPADBUSY(sv))
3961 SvPADMY_on(sv);
3280af22 3962 PL_curpad[ix] = sv;
748a9306
LW		 3963 }
3964 }
3965 else {
aa689395 3966 SV* sv = NEWSV(0,0);
748a9306 3967 SvPADTMP_on(sv);
3280af22 3968 PL_curpad[ix] = sv;
748a9306
LW		 3969 }
3970 }
3971
5f05dabc 3972 /* Now that vars are all in place, clone nested closures. */
3973
9607fc9c 3974 for (ix = fpad; ix > 0; ix--) {
3975 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
aa689395 3976 if (namesv
3280af22 3977 && namesv != &PL_sv_undef
aa689395 3978 && !(SvFLAGS(namesv) & SVf_FAKE)
3979 && *SvPVX(namesv) == '&'
5f05dabc 3980 && CvCLONE(ppad[ix]))
3981 {
3982 CV *kid = cv_clone2((CV*)ppad[ix], cv);
3983 SvREFCNT_dec(ppad[ix]);
3984 CvCLONE_on(kid);
3985 SvPADMY_on(kid);
3280af22 3986 PL_curpad[ix] = (SV*)kid;
748a9306
LW		 3987 }
3988 }
3989
5f05dabc 3990#ifdef DEBUG_CLOSURES
ab50184a
CS		 3991 PerlIO_printf(Perl_debug_log, "Cloned inside:\n");
3992 cv_dump(outside);
3993 PerlIO_printf(Perl_debug_log, " from:\n");
5f05dabc 3994 cv_dump(proto);
ab50184a 3995 PerlIO_printf(Perl_debug_log, " to:\n");
5f05dabc 3996 cv_dump(cv);
3997#endif
3998
748a9306
LW		 3999 LEAVE;
4000 return cv;
4001}
4002
4003CV *
864dbfa3 4004Perl_cv_clone(pTHX_ CV *proto)
5f05dabc 4005{
b099ddc0
GS		 4006 CV *cv;
4007 MUTEX_LOCK(&PL_cred_mutex); /* XXX create separate mutex */
4008 cv = cv_clone2(proto, CvOUTSIDE(proto));
4009 MUTEX_UNLOCK(&PL_cred_mutex); /* XXX create separate mutex */
4010 return cv;
5f05dabc 4011}
4012
3fe9a6f1 4013void
864dbfa3 4014Perl_cv_ckproto(pTHX_ CV *cv, GV *gv, char *p)
3fe9a6f1 4015{
0453d815
PM		 4016 dTHR;
4017
f248d071 4018 if (((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX(cv)))) && ckWARN_d(WARN_UNSAFE)) {
46fc3d4c 4019 SV* msg = sv_newmortal();
3fe9a6f1 4020 SV* name = Nullsv;
4021
4022 if (gv)
46fc3d4c 4023 gv_efullname3(name = sv_newmortal(), gv, Nullch);
4024 sv_setpv(msg, "Prototype mismatch:");
4025 if (name)
cea2e8a9 4026 Perl_sv_catpvf(aTHX_ msg, " sub %_", name);
3fe9a6f1 4027 if (SvPOK(cv))
cea2e8a9 4028 Perl_sv_catpvf(aTHX_ msg, " (%s)", SvPVX(cv));
46fc3d4c 4029 sv_catpv(msg, " vs ");
4030 if (p)
cea2e8a9 4031 Perl_sv_catpvf(aTHX_ msg, "(%s)", p);
46fc3d4c 4032 else
4033 sv_catpv(msg, "none");
0453d815 4034 Perl_warner(aTHX_ WARN_UNSAFE, "%_", msg);
3fe9a6f1 4035 }
4036}
4037
760ac839 4038SV *
864dbfa3 4039Perl_cv_const_sv(pTHX_ CV *cv)
760ac839 4040{
54310121 4041 if (!cv || !SvPOK(cv) || SvCUR(cv))
4042 return Nullsv;
fe5e78ed
GS		 4043 return op_const_sv(CvSTART(cv), cv);
4044}
760ac839 4045
fe5e78ed 4046SV *
864dbfa3 4047Perl_op_const_sv(pTHX_ OP *o, CV *cv)
fe5e78ed
GS		 4048{
4049 SV *sv = Nullsv;
4050
4051 if(!o)
4052 return Nullsv;
4053
4054 if(o->op_type == OP_LINESEQ && cLISTOPo->op_first)
4055 o = cLISTOPo->op_first->op_sibling;
4056
4057 for (; o; o = o->op_next) {
54310121 4058 OPCODE type = o->op_type;
fe5e78ed 4059
acb36ea4 4060 if (sv && o->op_next == o)
fe5e78ed 4061 return sv;
54310121 4062 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
4063 continue;
4064 if (type == OP_LEAVESUB || type == OP_RETURN)
4065 break;
4066 if (sv)
4067 return Nullsv;
4068 if (type == OP_CONST)
5dc0d613 4069 sv = cSVOPo->op_sv;
fe5e78ed 4070 else if (type == OP_PADSV && cv) {
e858de61
MB		 4071 AV* padav = (AV*)(AvARRAY(CvPADLIST(cv))[1]);
4072 sv = padav ? AvARRAY(padav)[o->op_targ] : Nullsv;
5aabfad6 4073 if (!sv || (!SvREADONLY(sv) && SvREFCNT(sv) > 1))
54310121 4074 return Nullsv;
760ac839 4075 }
54310121 4076 else
4077 return Nullsv;
760ac839 4078 }
5aabfad6 4079 if (sv)
4080 SvREADONLY_on(sv);
760ac839
LW		 4081 return sv;
4082}
4083
09bef843
SB		 4084void
4085Perl_newMYSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
4086{
4087 if (o)
4088 SAVEFREEOP(o);
4089 if (proto)
4090 SAVEFREEOP(proto);
4091 if (attrs)
4092 SAVEFREEOP(attrs);
4093 if (block)
4094 SAVEFREEOP(block);
4095 Perl_croak(aTHX_ "\"my sub\" not yet implemented");
4096}
4097
748a9306 4098CV *
864dbfa3 4099Perl_newSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *block)
79072805 4100{
09bef843
SB		 4101 return Perl_newATTRSUB(aTHX_ floor, o, proto, Nullop, block);
4102}
4103
4104CV *
4105Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
4106{
11343788 4107 dTHR;
2d8e6c8d
GS		 4108 STRLEN n_a;
4109 char *name = o ? SvPVx(cSVOPo->op_sv, n_a) : Nullch;
55d729e4 4110 GV *gv = gv_fetchpv(name ? name : "__ANON__",
09bef843
SB		 4111 GV_ADDMULTI | ((block || attrs) ? 0 : GV_NOINIT),
4112 SVt_PVCV);
2d8e6c8d 4113 char *ps = proto ? SvPVx(((SVOP*)proto)->op_sv, n_a) : Nullch;
a2008d6d 4114 register CV *cv=0;
a0d0e21e 4115 I32 ix;
79072805 4116
11343788 4117 if (o)
5dc0d613 4118 SAVEFREEOP(o);
3fe9a6f1 4119 if (proto)
4120 SAVEFREEOP(proto);
09bef843
SB		 4121 if (attrs)
4122 SAVEFREEOP(attrs);
3fe9a6f1 4123
09bef843 4124 if (SvTYPE(gv) != SVt_PVGV) { /* Maybe prototype now, and had at
55d729e4
GS		 4125 maximum a prototype before. */
4126 if (SvTYPE(gv) > SVt_NULL) {
0453d815 4127 if (!SvPOK((SV*)gv) && !(SvIOK((SV*)gv) && SvIVX((SV*)gv) == -1)
f248d071
GS		 4128 && ckWARN_d(WARN_UNSAFE))
4129 {
0453d815 4130 Perl_warner(aTHX_ WARN_UNSAFE, "Runaway prototype");
f248d071 4131 }
55d729e4
GS		 4132 cv_ckproto((CV*)gv, NULL, ps);
4133 }
4134 if (ps)
4135 sv_setpv((SV*)gv, ps);
4136 else
4137 sv_setiv((SV*)gv, -1);
3280af22
NIS		 4138 SvREFCNT_dec(PL_compcv);
4139 cv = PL_compcv = NULL;
4140 PL_sub_generation++;
55d729e4
GS		 4141 goto noblock;
4142 }
4143
68dc0745 4144 if (!name || GvCVGEN(gv))
4145 cv = Nullcv;
4146 else if (cv = GvCV(gv)) {
3fe9a6f1 4147 cv_ckproto(cv, gv, ps);
68dc0745 4148 /* already defined (or promised)? */
4149 if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
4150 SV* const_sv;
fe5e78ed 4151 bool const_changed = TRUE;
09bef843 4152 if (!block && !attrs) {
aa689395 4153 /* just a "sub foo;" when &foo is already defined */
3280af22 4154 SAVEFREESV(PL_compcv);
aa689395 4155 goto done;
4156 }
7bac28a0 4157 /* ahem, death to those who redefine active sort subs */
3280af22 4158 if (PL_curstackinfo->si_type == PERLSI_SORT && PL_sortcop == CvSTART(cv))
cea2e8a9 4159 Perl_croak(aTHX_ "Can't redefine active sort subroutine %s", name);
09bef843
SB		 4160 if (!block)
4161 goto withattrs;
fe5e78ed
GS		 4162 if(const_sv = cv_const_sv(cv))
4163 const_changed = sv_cmp(const_sv, op_const_sv(block, Nullcv));
599cee73
PM		 4164 if ((const_sv && const_changed) || ckWARN(WARN_REDEFINE)
4165 && !(CvGV(cv) && GvSTASH(CvGV(cv))
2f34f9d4
IZ		 4166 && HvNAME(GvSTASH(CvGV(cv)))
4167 && strEQ(HvNAME(GvSTASH(CvGV(cv))),
4168 "autouse"))) {
3280af22
NIS		 4169 line_t oldline = PL_curcop->cop_line;
4170 PL_curcop->cop_line = PL_copline;
cea2e8a9 4171 Perl_warner(aTHX_ WARN_REDEFINE,
599cee73 4172 const_sv ? "Constant subroutine %s redefined"
09bef843 4173 : "Subroutine %s redefined", name);
3280af22 4174 PL_curcop->cop_line = oldline;
79072805 4175 }
8990e307 4176 SvREFCNT_dec(cv);
68dc0745 4177 cv = Nullcv;
79072805
LW		 4178 }
4179 }
09bef843
SB		 4180 withattrs:
4181 if (attrs) {
4182 HV *stash;
4183 SV *rcv;
4184
4185 /* Need to do a C<use attributes $stash_of_cv,\&cv,@attrs>
4186 * before we clobber PL_compcv.
4187 */
4188 if (cv && !block) {
4189 rcv = (SV*)cv;
4190 if (CvGV(cv) && GvSTASH(CvGV(cv)) && HvNAME(GvSTASH(CvGV(cv))))
4191 stash = GvSTASH(CvGV(cv));
4192 else if (CvSTASH(cv) && HvNAME(CvSTASH(cv)))
4193 stash = CvSTASH(cv);
4194 else
4195 stash = PL_curstash;
4196 }
4197 else {
4198 /* possibly about to re-define existing subr -- ignore old cv */
4199 rcv = (SV*)PL_compcv;
4200 if (name && GvSTASH(gv) && HvNAME(GvSTASH(gv)))
4201 stash = GvSTASH(gv);
4202 else
4203 stash = PL_curstash;
4204 }
4205 apply_attrs(stash, rcv, attrs);
4206 }
a0d0e21e 4207 if (cv) { /* must reuse cv if autoloaded */
09bef843
SB		 4208 if (!block) {
4209 /* got here with just attrs -- work done, so bug out */
4210 SAVEFREESV(PL_compcv);
4211 goto done;
4212 }
4633a7c4 4213 cv_undef(cv);
3280af22
NIS		 4214 CvFLAGS(cv) = CvFLAGS(PL_compcv);
4215 CvOUTSIDE(cv) = CvOUTSIDE(PL_compcv);
4216 CvOUTSIDE(PL_compcv) = 0;
4217 CvPADLIST(cv) = CvPADLIST(PL_compcv);
4218 CvPADLIST(PL_compcv) = 0;
4219 if (SvREFCNT(PL_compcv) > 1) /* XXX Make closures transit through stub. */
4220 CvOUTSIDE(PL_compcv) = (CV*)SvREFCNT_inc((SV*)cv);
4221 SvREFCNT_dec(PL_compcv);
a0d0e21e
LW		 4222 }
4223 else {
3280af22 4224 cv = PL_compcv;
44a8e56a 4225 if (name) {
4226 GvCV(gv) = cv;
4227 GvCVGEN(gv) = 0;
3280af22 4228 PL_sub_generation++;
44a8e56a 4229 }
a0d0e21e 4230 }
44a8e56a 4231 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
3280af22
NIS		 4232 CvFILEGV(cv) = PL_curcop->cop_filegv;
4233 CvSTASH(cv) = PL_curstash;
11343788
MB		 4234#ifdef USE_THREADS
4235 CvOWNER(cv) = 0;
1cfa4ec7 4236 if (!CvMUTEXP(cv)) {
f6aaf501 4237 New(666, CvMUTEXP(cv), 1, perl_mutex);
1cfa4ec7
GS		 4238 MUTEX_INIT(CvMUTEXP(cv));
4239 }
11343788 4240#endif /* USE_THREADS */
8990e307 4241
3fe9a6f1 4242 if (ps)
4243 sv_setpv((SV*)cv, ps);
4633a7c4 4244
3280af22 4245 if (PL_error_count) {
c07a80fd 4246 op_free(block);
4247 block = Nullop;
68dc0745 4248 if (name) {
4249 char *s = strrchr(name, ':');
4250 s = s ? s+1 : name;
6d4c2119
CS		 4251 if (strEQ(s, "BEGIN")) {
4252 char *not_safe =
4253 "BEGIN not safe after errors--compilation aborted";
faef0170 4254 if (PL_in_eval & EVAL_KEEPERR)
cea2e8a9 4255 Perl_croak(aTHX_ not_safe);
6d4c2119
CS		 4256 else {
4257 /* force display of errors found but not reported */
38a03e6e 4258 sv_catpv(ERRSV, not_safe);
cea2e8a9 4259 Perl_croak(aTHX_ "%s", SvPVx(ERRSV, n_a));
6d4c2119
CS		 4260 }
4261 }
68dc0745 4262 }
c07a80fd 4263 }
a0d0e21e 4264 if (!block) {
55d729e4 4265 noblock:
3280af22 4266 PL_copline = NOLINE;
a0d0e21e
LW		 4267 LEAVE_SCOPE(floor);
4268 return cv;
4269 }
4270
3280af22
NIS		 4271 if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad))
4272 av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv);
a0d0e21e 4273
54310121 4274 if (CvCLONE(cv)) {
3280af22
NIS		 4275 SV **namep = AvARRAY(PL_comppad_name);
4276 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
54310121 4277 SV *namesv;
4278
3280af22 4279 if (SvIMMORTAL(PL_curpad[ix]))
54310121 4280 continue;
4281 /*
4282 * The only things that a clonable function needs in its
4283 * pad are references to outer lexicals and anonymous subs.
4284 * The rest are created anew during cloning.
4285 */
4286 if (!((namesv = namep[ix]) != Nullsv &&
3280af22 4287 namesv != &PL_sv_undef &&
54310121 4288 (SvFAKE(namesv) ||
4289 *SvPVX(namesv) == '&')))
4290 {
3280af22
NIS		 4291 SvREFCNT_dec(PL_curpad[ix]);
4292 PL_curpad[ix] = Nullsv;
54310121 4293 }
4294 }
a0d0e21e 4295 }
54310121 4296 else {
4297 AV *av = newAV(); /* Will be @_ */
4298 av_extend(av, 0);
3280af22 4299 av_store(PL_comppad, 0, (SV*)av);
54310121 4300 AvFLAGS(av) = AVf_REIFY;
79072805 4301
3280af22
NIS		 4302 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
4303 if (SvIMMORTAL(PL_curpad[ix]))
54310121 4304 continue;
3280af22
NIS		 4305 if (!SvPADMY(PL_curpad[ix]))
4306 SvPADTMP_on(PL_curpad[ix]);
54310121 4307 }
4308 }
79072805 4309
cd06dffe
GS		 4310 if(CvLVALUE(cv)) {
4311 CvROOT(cv) = newUNOP(OP_LEAVESUBLV, 0, scalarseq(block));
4312 }
4313 else {
4314 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
4315 }
79072805
LW		 4316 CvSTART(cv) = LINKLIST(CvROOT(cv));
4317 CvROOT(cv)->op_next = 0;
4318 peep(CvSTART(cv));
93a17b20 4319
44a8e56a 4320 if (name) {
4321 char *s;
4322
3280af22 4323 if (PERLDB_SUBLINE && PL_curstash != PL_debstash) {
46fc3d4c 4324 SV *sv = NEWSV(0,0);
44a8e56a 4325 SV *tmpstr = sv_newmortal();
549bb64a 4326 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
44a8e56a 4327 CV *cv;
4328 HV *hv;
4329
cea2e8a9 4330 Perl_sv_setpvf(aTHX_ sv, "%_:%ld-%ld",
3280af22
NIS		 4331 GvSV(PL_curcop->cop_filegv),
4332 (long)PL_subline, (long)PL_curcop->cop_line);
44a8e56a 4333 gv_efullname3(tmpstr, gv, Nullch);
3280af22 4334 hv_store(GvHV(PL_DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 4335 hv = GvHVn(db_postponed);
9607fc9c 4336 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX(tmpstr), SvCUR(tmpstr))
4337 && (cv = GvCV(db_postponed))) {
44a8e56a 4338 dSP;
924508f0 4339 PUSHMARK(SP);
44a8e56a 4340 XPUSHs(tmpstr);
4341 PUTBACK;
864dbfa3 4342 call_sv((SV*)cv, G_DISCARD);
44a8e56a 4343 }
4344 }
79072805 4345
44a8e56a 4346 if ((s = strrchr(name,':')))
28757baa 4347 s++;
4348 else
4349 s = name;
68dc0745 4350 if (strEQ(s, "BEGIN")) {
3280af22 4351 I32 oldscope = PL_scopestack_ix;
28757baa 4352 ENTER;
3280af22
NIS		 4353 SAVESPTR(PL_compiling.cop_filegv);
4354 SAVEI16(PL_compiling.cop_line);
4355 save_svref(&PL_rs);
4356 sv_setsv(PL_rs, PL_nrs);
28757baa 4357
3280af22
NIS		 4358 if (!PL_beginav)
4359 PL_beginav = newAV();
28757baa 4360 DEBUG_x( dump_sub(gv) );
3280af22 4361 av_push(PL_beginav, (SV *)cv);
28757baa 4362 GvCV(gv) = 0;
3280af22 4363 call_list(oldscope, PL_beginav);
a6006777 4364
3280af22 4365 PL_curcop = &PL_compiling;
a0ed51b3 4366 PL_compiling.op_private = PL_hints;
28757baa 4367 LEAVE;
4368 }
3280af22
NIS		 4369 else if (strEQ(s, "END") && !PL_error_count) {
4370 if (!PL_endav)
4371 PL_endav = newAV();
4372 av_unshift(PL_endav, 1);
4373 av_store(PL_endav, 0, (SV *)cv);
28757baa 4374 GvCV(gv) = 0;
4375 }
3280af22
NIS		 4376 else if (strEQ(s, "INIT") && !PL_error_count) {
4377 if (!PL_initav)
4378 PL_initav = newAV();
4379 av_push(PL_initav, SvREFCNT_inc(cv));
b7aad4fe 4380 GvCV(gv) = 0;
ae77835f 4381 }
79072805 4382 }
a6006777 4383
aa689395 4384 done:
3280af22 4385 PL_copline = NOLINE;
8990e307 4386 LEAVE_SCOPE(floor);
a0d0e21e 4387 return cv;
79072805
LW		 4388}
4389
b099ddc0 4390/* XXX unsafe for threads if eval_owner isn't held */
5476c433 4391void
864dbfa3 4392Perl_newCONSTSUB(pTHX_ HV *stash, char *name, SV *sv)
5476c433
JD		 4393{
4394 dTHR;
3280af22
NIS		 4395 U32 oldhints = PL_hints;
4396 HV *old_cop_stash = PL_curcop->cop_stash;
4397 HV *old_curstash = PL_curstash;
4398 line_t oldline = PL_curcop->cop_line;
4399 PL_curcop->cop_line = PL_copline;
5476c433 4400
3280af22 4401 PL_hints &= ~HINT_BLOCK_SCOPE;
5476c433 4402 if(stash)
3280af22 4403 PL_curstash = PL_curcop->cop_stash = stash;
5476c433 4404
09bef843 4405 newATTRSUB(
be24f278 4406 start_subparse(FALSE, 0),
5476c433 4407 newSVOP(OP_CONST, 0, newSVpv(name,0)),
6b88bc9c 4408 newSVOP(OP_CONST, 0, &PL_sv_no), /* SvPV(&PL_sv_no) == "" -- GMB */
09bef843 4409 Nullop,
5476c433
JD		 4410 newSTATEOP(0, Nullch, newSVOP(OP_CONST, 0, sv))
4411 );
4412
3280af22
NIS		 4413 PL_hints = oldhints;
4414 PL_curcop->cop_stash = old_cop_stash;
4415 PL_curstash = old_curstash;
4416 PL_curcop->cop_line = oldline;
5476c433
JD		 4417}
4418
57d3b86d 4419CV *
864dbfa3 4420Perl_newXS(pTHX_ char *name, XSUBADDR_t subaddr, char *filename)
a0d0e21e 4421{
11343788 4422 dTHR;
44a8e56a 4423 GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
79072805 4424 register CV *cv;
44a8e56a 4425
4426 if (cv = (name ? GvCV(gv) : Nullcv)) {
4427 if (GvCVGEN(gv)) {
4428 /* just a cached method */
4429 SvREFCNT_dec(cv);
4430 cv = 0;
4431 }
4432 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
4433 /* already defined (or promised) */
599cee73 4434 if (ckWARN(WARN_REDEFINE) && !(CvGV(cv) && GvSTASH(CvGV(cv))
2f34f9d4
IZ		 4435 && HvNAME(GvSTASH(CvGV(cv)))
4436 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "autouse"))) {
3280af22 4437 line_t oldline = PL_curcop->cop_line;
51f6edd3
GS		 4438 if (PL_copline != NOLINE)
4439 PL_curcop->cop_line = PL_copline;
cea2e8a9 4440 Perl_warner(aTHX_ WARN_REDEFINE, "Subroutine %s redefined",name);
3280af22 4441 PL_curcop->cop_line = oldline;
a0d0e21e
LW		 4442 }
4443 SvREFCNT_dec(cv);
4444 cv = 0;
79072805 4445 }
79072805 4446 }
44a8e56a 4447
4448 if (cv) /* must reuse cv if autoloaded */
4449 cv_undef(cv);
a0d0e21e
LW		 4450 else {
4451 cv = (CV*)NEWSV(1105,0);
4452 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 4453 if (name) {
4454 GvCV(gv) = cv;
4455 GvCVGEN(gv) = 0;
3280af22 4456 PL_sub_generation++;
44a8e56a 4457 }
a0d0e21e 4458 }
5196be3e 4459 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
11343788 4460#ifdef USE_THREADS
12ca11f6 4461 New(666, CvMUTEXP(cv), 1, perl_mutex);
11343788 4462 MUTEX_INIT(CvMUTEXP(cv));
11343788
MB		 4463 CvOWNER(cv) = 0;
4464#endif /* USE_THREADS */
79072805 4465 CvFILEGV(cv) = gv_fetchfile(filename);
a0d0e21e 4466 CvXSUB(cv) = subaddr;
44a8e56a 4467
28757baa 4468 if (name) {
4469 char *s = strrchr(name,':');
4470 if (s)
4471 s++;
4472 else
4473 s = name;
4474 if (strEQ(s, "BEGIN")) {
3280af22
NIS		 4475 if (!PL_beginav)
4476 PL_beginav = newAV();
4477 av_push(PL_beginav, (SV *)cv);
44a8e56a 4478 GvCV(gv) = 0;
28757baa 4479 }
4480 else if (strEQ(s, "END")) {
3280af22
NIS		 4481 if (!PL_endav)
4482 PL_endav = newAV();
4483 av_unshift(PL_endav, 1);
4484 av_store(PL_endav, 0, (SV *)cv);
44a8e56a 4485 GvCV(gv) = 0;
28757baa 4486 }
7d07dbc2 4487 else if (strEQ(s, "INIT")) {
3280af22
NIS		 4488 if (!PL_initav)
4489 PL_initav = newAV();
4490 av_push(PL_initav, (SV *)cv);
f8f842e4 4491 GvCV(gv) = 0;
ae77835f 4492 }
28757baa 4493 }
8990e307 4494 else
a5f75d66 4495 CvANON_on(cv);
44a8e56a 4496
a0d0e21e 4497 return cv;
79072805
LW		 4498}
4499
4500void
864dbfa3 4501Perl_newFORM(pTHX_ I32 floor, OP *o, OP *block)
79072805 4502{
11343788 4503 dTHR;
79072805
LW		 4504 register CV *cv;
4505 char *name;
4506 GV *gv;
a0d0e21e 4507 I32 ix;
2d8e6c8d 4508 STRLEN n_a;
79072805 4509
11343788 4510 if (o)
2d8e6c8d 4511 name = SvPVx(cSVOPo->op_sv, n_a);
79072805
LW		 4512 else
4513 name = "STDOUT";
85e6fe83 4514 gv = gv_fetchpv(name,TRUE, SVt_PVFM);
a5f75d66 4515 GvMULTI_on(gv);
79072805 4516 if (cv = GvFORM(gv)) {
599cee73 4517 if (ckWARN(WARN_REDEFINE)) {
3280af22 4518 line_t oldline = PL_curcop->cop_line;
79072805 4519
3280af22 4520 PL_curcop->cop_line = PL_copline;
cea2e8a9 4521 Perl_warner(aTHX_ WARN_REDEFINE, "Format %s redefined",name);
3280af22 4522 PL_curcop->cop_line = oldline;
79072805 4523 }
8990e307 4524 SvREFCNT_dec(cv);
79072805 4525 }
3280af22 4526 cv = PL_compcv;
79072805 4527 GvFORM(gv) = cv;
44a8e56a 4528 CvGV(cv) = (GV*)SvREFCNT_inc(gv);
3280af22 4529 CvFILEGV(cv) = PL_curcop->cop_filegv;
79072805 4530
3280af22
NIS		 4531 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
4532 if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix]))
4533 SvPADTMP_on(PL_curpad[ix]);
a0d0e21e
LW		 4534 }
4535
79072805
LW		 4536 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
4537 CvSTART(cv) = LINKLIST(CvROOT(cv));
4538 CvROOT(cv)->op_next = 0;
4539 peep(CvSTART(cv));
11343788 4540 op_free(o);
3280af22 4541 PL_copline = NOLINE;
8990e307 4542 LEAVE_SCOPE(floor);
79072805
LW		 4543}
4544
4545OP *
864dbfa3 4546Perl_newANONLIST(pTHX_ OP *o)
79072805 4547{
93a17b20 4548 return newUNOP(OP_REFGEN, 0,
11343788 4549 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 4550}
4551
4552OP *
864dbfa3 4553Perl_newANONHASH(pTHX_ OP *o)
79072805 4554{
93a17b20 4555 return newUNOP(OP_REFGEN, 0,
11343788 4556 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 4557}
4558
4559OP *
864dbfa3 4560Perl_newANONSUB(pTHX_ I32 floor, OP *proto, OP *block)
a0d0e21e 4561{
09bef843
SB		 4562 return newANONATTRSUB(floor, proto, Nullop, block);
4563}
4564
4565OP *
4566Perl_newANONATTRSUB(pTHX_ I32 floor, OP *proto, OP *attrs, OP *block)
4567{
a0d0e21e 4568 return newUNOP(OP_REFGEN, 0,
09bef843
SB		 4569 newSVOP(OP_ANONCODE, 0,
4570 (SV*)newATTRSUB(floor, 0, proto, attrs, block)));
79072805
LW		 4571}
4572
4573OP *
864dbfa3 4574Perl_oopsAV(pTHX_ OP *o)
79072805 4575{
ed6116ce
LW		 4576 switch (o->op_type) {
4577 case OP_PADSV:
4578 o->op_type = OP_PADAV;
22c35a8c 4579 o->op_ppaddr = PL_ppaddr[OP_PADAV];
51e247a3 4580 return ref(o, OP_RV2AV);
ed6116ce
LW		 4581
4582 case OP_RV2SV:
79072805 4583 o->op_type = OP_RV2AV;
22c35a8c 4584 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 4585 ref(o, OP_RV2AV);
ed6116ce
LW		 4586 break;
4587
4588 default:
0453d815
PM		 4589 if (ckWARN_d(WARN_INTERNAL))
4590 Perl_warner(aTHX_ WARN_INTERNAL, "oops: oopsAV");
ed6116ce
LW		 4591 break;
4592 }
79072805
LW		 4593 return o;
4594}
4595
4596OP *
864dbfa3 4597Perl_oopsHV(pTHX_ OP *o)
79072805 4598{
0453d815 4599 dTHR;
0453d815 4600
ed6116ce
LW		 4601 switch (o->op_type) {
4602 case OP_PADSV:
4603 case OP_PADAV:
4604 o->op_type = OP_PADHV;
22c35a8c 4605 o->op_ppaddr = PL_ppaddr[OP_PADHV];
51e247a3 4606 return ref(o, OP_RV2HV);
ed6116ce
LW		 4607
4608 case OP_RV2SV:
4609 case OP_RV2AV:
79072805 4610 o->op_type = OP_RV2HV;
22c35a8c 4611 o->op_ppaddr = PL_ppaddr[OP_RV2HV];
79072805 4612 ref(o, OP_RV2HV);
ed6116ce
LW		 4613 break;
4614
4615 default:
0453d815
PM		 4616 if (ckWARN_d(WARN_INTERNAL))
4617 Perl_warner(aTHX_ WARN_INTERNAL, "oops: oopsHV");
ed6116ce
LW		 4618 break;
4619 }
79072805
LW		 4620 return o;
4621}
4622
4623OP *
864dbfa3 4624Perl_newAVREF(pTHX_ OP *o)
79072805 4625{
ed6116ce
LW		 4626 if (o->op_type == OP_PADANY) {
4627 o->op_type = OP_PADAV;
22c35a8c 4628 o->op_ppaddr = PL_ppaddr[OP_PADAV];
93a17b20 4629 return o;
ed6116ce 4630 }
79072805
LW		 4631 return newUNOP(OP_RV2AV, 0, scalar(o));
4632}
4633
4634OP *
864dbfa3 4635Perl_newGVREF(pTHX_ I32 type, OP *o)
79072805 4636{
82092f1d 4637 if (type == OP_MAPSTART || type == OP_GREPSTART || type == OP_SORT)
a0d0e21e 4638 return newUNOP(OP_NULL, 0, o);
748a9306 4639 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 4640}
4641
4642OP *
864dbfa3 4643Perl_newHVREF(pTHX_ OP *o)
79072805 4644{
ed6116ce
LW		 4645 if (o->op_type == OP_PADANY) {
4646 o->op_type = OP_PADHV;
22c35a8c 4647 o->op_ppaddr = PL_ppaddr[OP_PADHV];
93a17b20 4648 return o;
ed6116ce 4649 }
79072805
LW		 4650 return newUNOP(OP_RV2HV, 0, scalar(o));
4651}
4652
4653OP *
864dbfa3 4654Perl_oopsCV(pTHX_ OP *o)
79072805 4655{
cea2e8a9 4656 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805
LW		 4657 /* STUB */
4658 return o;
4659}
4660
4661OP *
864dbfa3 4662Perl_newCVREF(pTHX_ I32 flags, OP *o)
79072805 4663{
c07a80fd 4664 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 4665}
4666
4667OP *
864dbfa3 4668Perl_newSVREF(pTHX_ OP *o)
79072805 4669{
ed6116ce
LW		 4670 if (o->op_type == OP_PADANY) {
4671 o->op_type = OP_PADSV;
22c35a8c 4672 o->op_ppaddr = PL_ppaddr[OP_PADSV];
93a17b20 4673 return o;
ed6116ce 4674 }
224a4551
MB		 4675 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
4676 o->op_flags |= OPpDONE_SVREF;
a863c7d1 4677 return o;
224a4551 4678 }
79072805
LW		 4679 return newUNOP(OP_RV2SV, 0, scalar(o));
4680}
4681
4682/* Check routines. */
4683
4684OP *
cea2e8a9 4685Perl_ck_anoncode(pTHX_ OP *o)
5f05dabc 4686{
178c6305
CS		 4687 PADOFFSET ix;
4688 SV* name;
4689
4690 name = NEWSV(1106,0);
4691 sv_upgrade(name, SVt_PVNV);
4692 sv_setpvn(name, "&", 1);
4693 SvIVX(name) = -1;
4694 SvNVX(name) = 1;
5dc0d613 4695 ix = pad_alloc(o->op_type, SVs_PADMY);
3280af22
NIS		 4696 av_store(PL_comppad_name, ix, name);
4697 av_store(PL_comppad, ix, cSVOPo->op_sv);
5dc0d613
MB		 4698 SvPADMY_on(cSVOPo->op_sv);
4699 cSVOPo->op_sv = Nullsv;
4700 cSVOPo->op_targ = ix;
4701 return o;
5f05dabc 4702}
4703
4704OP *
cea2e8a9 4705Perl_ck_bitop(pTHX_ OP *o)
55497cff 4706{
3280af22 4707 o->op_private = PL_hints;
5dc0d613 4708 return o;
55497cff 4709}
4710
4711OP *
cea2e8a9 4712Perl_ck_concat(pTHX_ OP *o)
79072805 4713{
11343788
MB		 4714 if (cUNOPo->op_first->op_type == OP_CONCAT)
4715 o->op_flags |= OPf_STACKED;
4716 return o;
79072805
LW		 4717}
4718
4719OP *
cea2e8a9 4720Perl_ck_spair(pTHX_ OP *o)
79072805 4721{
11343788 4722 if (o->op_flags & OPf_KIDS) {
79072805 4723 OP* newop;
a0d0e21e 4724 OP* kid;
5dc0d613
MB		 4725 OPCODE type = o->op_type;
4726 o = modkids(ck_fun(o), type);
11343788 4727 kid = cUNOPo->op_first;
a0d0e21e
LW		 4728 newop = kUNOP->op_first->op_sibling;
4729 if (newop &&
4730 (newop->op_sibling ||
22c35a8c 4731 !(PL_opargs[newop->op_type] & OA_RETSCALAR) ||
a0d0e21e
LW		 4732 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
4733 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
aeea060c 4734
11343788 4735 return o;
a0d0e21e
LW		 4736 }
4737 op_free(kUNOP->op_first);
4738 kUNOP->op_first = newop;
4739 }
22c35a8c 4740 o->op_ppaddr = PL_ppaddr[++o->op_type];
11343788 4741 return ck_fun(o);
a0d0e21e
LW		 4742}
4743
4744OP *
cea2e8a9 4745Perl_ck_delete(pTHX_ OP *o)
a0d0e21e 4746{
11343788 4747 o = ck_fun(o);
5dc0d613 4748 o->op_private = 0;
11343788
MB		 4749 if (o->op_flags & OPf_KIDS) {
4750 OP *kid = cUNOPo->op_first;
5f05dabc 4751 if (kid->op_type == OP_HSLICE)
5dc0d613 4752 o->op_private |= OPpSLICE;
5f05dabc 4753 else if (kid->op_type != OP_HELEM)
cea2e8a9 4754 Perl_croak(aTHX_ "%s argument is not a HASH element or slice",
22c35a8c 4755 PL_op_desc[o->op_type]);
a0d0e21e 4756 null(kid);
79072805 4757 }
11343788 4758 return o;
79072805
LW		 4759}
4760
4761OP *
cea2e8a9 4762Perl_ck_eof(pTHX_ OP *o)
79072805 4763{
11343788 4764 I32 type = o->op_type;
79072805 4765
11343788
MB		 4766 if (o->op_flags & OPf_KIDS) {
4767 if (cLISTOPo->op_first->op_type == OP_STUB) {
4768 op_free(o);
4769 o = newUNOP(type, OPf_SPECIAL,
d58bf5aa 4770 newGVOP(OP_GV, 0, gv_fetchpv("main::ARGV", TRUE, SVt_PVAV)));
8990e307 4771 }
11343788 4772 return ck_fun(o);
79072805 4773 }
11343788 4774 return o;
79072805
LW		 4775}
4776
4777OP *
cea2e8a9 4778Perl_ck_eval(pTHX_ OP *o)
79072805 4779{
3280af22 4780 PL_hints |= HINT_BLOCK_SCOPE;
11343788
MB		 4781 if (o->op_flags & OPf_KIDS) {
4782 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 4783
93a17b20 4784 if (!kid) {
11343788
MB		 4785 o->op_flags &= ~OPf_KIDS;
4786 null(o);
79072805
LW		 4787 }
4788 else if (kid->op_type == OP_LINESEQ) {
4789 LOGOP *enter;
4790
11343788
MB		 4791 kid->op_next = o->op_next;
4792 cUNOPo->op_first = 0;
4793 op_free(o);
79072805 4794
b7dc083c 4795 NewOp(1101, enter, 1, LOGOP);
79072805 4796 enter->op_type = OP_ENTERTRY;
22c35a8c 4797 enter->op_ppaddr = PL_ppaddr[OP_ENTERTRY];
79072805
LW		 4798 enter->op_private = 0;
4799
4800 /* establish postfix order */
4801 enter->op_next = (OP*)enter;
4802
11343788
MB		 4803 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
4804 o->op_type = OP_LEAVETRY;
22c35a8c 4805 o->op_ppaddr = PL_ppaddr[OP_LEAVETRY];
11343788
MB		 4806 enter->op_other = o;
4807 return o;
79072805 4808 }
c7cc6f1c 4809 else
473986ff 4810 scalar((OP*)kid);
79072805
LW		 4811 }
4812 else {
11343788 4813 op_free(o);
54b9620d 4814 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
79072805 4815 }
3280af22 4816 o->op_targ = (PADOFFSET)PL_hints;
11343788 4817 return o;
79072805
LW		 4818}
4819
4820OP *
cea2e8a9 4821Perl_ck_exec(pTHX_ OP *o)
79072805
LW		 4822{
4823 OP *kid;
11343788
MB		 4824 if (o->op_flags & OPf_STACKED) {
4825 o = ck_fun(o);
4826 kid = cUNOPo->op_first->op_sibling;
8990e307
LW		 4827 if (kid->op_type == OP_RV2GV)
4828 null(kid);
79072805 4829 }
463ee0b2 4830 else
11343788
MB		 4831 o = listkids(o);
4832 return o;
79072805
LW		 4833}
4834
4835OP *
cea2e8a9 4836Perl_ck_exists(pTHX_ OP *o)
5f05dabc 4837{
5196be3e
MB		 4838 o = ck_fun(o);
4839 if (o->op_flags & OPf_KIDS) {
4840 OP *kid = cUNOPo->op_first;
5f05dabc 4841 if (kid->op_type != OP_HELEM)
cea2e8a9 4842 Perl_croak(aTHX_ "%s argument is not a HASH element", PL_op_desc[o->op_type]);
5f05dabc 4843 null(kid);
4844 }
5196be3e 4845 return o;
5f05dabc 4846}
4847
22c35a8c 4848#if 0
5f05dabc 4849OP *
cea2e8a9 4850Perl_ck_gvconst(pTHX_ register OP *o)
79072805
LW		 4851{
4852 o = fold_constants(o);
4853 if (o->op_type == OP_CONST)
4854 o->op_type = OP_GV;
4855 return o;
4856}
22c35a8c 4857#endif
79072805
LW		 4858
4859OP *
cea2e8a9 4860Perl_ck_rvconst(pTHX_ register OP *o)
79072805 4861{
11343788
MB		 4862 dTHR;
4863 SVOP *kid = (SVOP*)cUNOPo->op_first;
85e6fe83 4864
3280af22 4865 o->op_private |= (PL_hints & HINT_STRICT_REFS);
79072805 4866 if (kid->op_type == OP_CONST) {
44a8e56a 4867 char *name;
4868 int iscv;
4869 GV *gv;
779c5bc9 4870 SV *kidsv = kid->op_sv;
2d8e6c8d 4871 STRLEN n_a;
44a8e56a 4872
779c5bc9
GS		 4873 /* Is it a constant from cv_const_sv()? */
4874 if (SvROK(kidsv) && SvREADONLY(kidsv)) {
4875 SV *rsv = SvRV(kidsv);
4876 int svtype = SvTYPE(rsv);
4877 char *badtype = Nullch;
4878
4879 switch (o->op_type) {
4880 case OP_RV2SV:
4881 if (svtype > SVt_PVMG)
4882 badtype = "a SCALAR";
4883 break;
4884 case OP_RV2AV:
4885 if (svtype != SVt_PVAV)
4886 badtype = "an ARRAY";
4887 break;
4888 case OP_RV2HV:
4889 if (svtype != SVt_PVHV) {
4890 if (svtype == SVt_PVAV) { /* pseudohash? */
4891 SV **ksv = av_fetch((AV*)rsv, 0, FALSE);
4892 if (ksv && SvROK(*ksv)
4893 && SvTYPE(SvRV(*ksv)) == SVt_PVHV)
4894 {
4895 break;
4896 }
4897 }
4898 badtype = "a HASH";
4899 }
4900 break;
4901 case OP_RV2CV:
4902 if (svtype != SVt_PVCV)
4903 badtype = "a CODE";
4904 break;
4905 }
4906 if (badtype)
cea2e8a9 4907 Perl_croak(aTHX_ "Constant is not %s reference", badtype);
779c5bc9
GS		 4908 return o;
4909 }
2d8e6c8d 4910 name = SvPV(kidsv, n_a);
3280af22 4911 if ((PL_hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
44a8e56a 4912 char *badthing = Nullch;
5dc0d613 4913 switch (o->op_type) {
44a8e56a 4914 case OP_RV2SV:
4915 badthing = "a SCALAR";
4916 break;
4917 case OP_RV2AV:
4918 badthing = "an ARRAY";
4919 break;
4920 case OP_RV2HV:
4921 badthing = "a HASH";
4922 break;
4923 }
4924 if (badthing)
cea2e8a9 4925 Perl_croak(aTHX_
44a8e56a 4926 "Can't use bareword (\"%s\") as %s ref while \"strict refs\" in use",
4927 name, badthing);
4928 }
93233ece
CS		 4929 /*
4930 * This is a little tricky. We only want to add the symbol if we
4931 * didn't add it in the lexer. Otherwise we get duplicate strict
4932 * warnings. But if we didn't add it in the lexer, we must at
4933 * least pretend like we wanted to add it even if it existed before,
4934 * or we get possible typo warnings. OPpCONST_ENTERED says
4935 * whether the lexer already added THIS instance of this symbol.
4936 */
5196be3e 4937 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 4938 do {
44a8e56a 4939 gv = gv_fetchpv(name,
748a9306 4940 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 4941 iscv
4942 ? SVt_PVCV
11343788 4943 : o->op_type == OP_RV2SV
a0d0e21e 4944 ? SVt_PV
11343788 4945 : o->op_type == OP_RV2AV
a0d0e21e 4946 ? SVt_PVAV
11343788 4947 : o->op_type == OP_RV2HV
a0d0e21e
LW		 4948 ? SVt_PVHV
4949 : SVt_PVGV);
93233ece
CS		 4950 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
4951 if (gv) {
4952 kid->op_type = OP_GV;
4953 SvREFCNT_dec(kid->op_sv);
4954 kid->op_sv = SvREFCNT_inc(gv);
76cd736e 4955 kid->op_ppaddr = PL_ppaddr[OP_GV];
a0d0e21e 4956 }
79072805 4957 }
11343788 4958 return o;
79072805
LW		 4959}
4960
4961OP *
cea2e8a9 4962Perl_ck_ftst(pTHX_ OP *o)
79072805 4963{
11343788
MB		 4964 dTHR;
4965 I32 type = o->op_type;
79072805 4966
11343788
MB		 4967 if (o->op_flags & OPf_REF)
4968 return o;
79072805 4969
108ed793 4970 if (o->op_flags & OPf_KIDS && cUNOPo->op_first->op_type != OP_STUB) {
11343788 4971 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805
LW		 4972
4973 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
2d8e6c8d 4974 STRLEN n_a;
a0d0e21e 4975 OP *newop = newGVOP(type, OPf_REF,
2d8e6c8d 4976 gv_fetchpv(SvPVx(kid->op_sv, n_a), TRUE, SVt_PVIO));
11343788 4977 op_free(o);
79072805
LW		 4978 return newop;
4979 }
4980 }
4981 else {
11343788 4982 op_free(o);
79072805 4983 if (type == OP_FTTTY)
fb73857a 4984 return newGVOP(type, OPf_REF, gv_fetchpv("main::STDIN", TRUE,
85e6fe83 4985 SVt_PVIO));
79072805 4986 else
54b9620d 4987 return newUNOP(type, 0, newDEFSVOP());
79072805 4988 }
11343788 4989 return o;
79072805
LW		 4990}
4991
4992OP *
cea2e8a9 4993Perl_ck_fun(pTHX_ OP *o)
79072805 4994{
11343788 4995 dTHR;
79072805
LW		 4996 register OP *kid;
4997 OP **tokid;
4998 OP *sibl;
4999 I32 numargs = 0;
11343788 5000 int type = o->op_type;
22c35a8c 5001 register I32 oa = PL_opargs[type] >> OASHIFT;
aeea060c 5002
11343788 5003 if (o->op_flags & OPf_STACKED) {
79072805
LW		 5004 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
5005 oa &= ~OA_OPTIONAL;
5006 else
11343788 5007 return no_fh_allowed(o);
79072805
LW		 5008 }
5009
11343788 5010 if (o->op_flags & OPf_KIDS) {
2d8e6c8d 5011 STRLEN n_a;
11343788
MB		 5012 tokid = &cLISTOPo->op_first;
5013 kid = cLISTOPo->op_first;
8990e307
LW		 5014 if (kid->op_type == OP_PUSHMARK ||
5015 kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK)
5016 {
79072805
LW		 5017 tokid = &kid->op_sibling;
5018 kid = kid->op_sibling;
5019 }
22c35a8c 5020 if (!kid && PL_opargs[type] & OA_DEFGV)
54b9620d 5021 *tokid = kid = newDEFSVOP();
79072805
LW		 5022
5023 while (oa && kid) {
5024 numargs++;
5025 sibl = kid->op_sibling;
5026 switch (oa & 7) {
5027 case OA_SCALAR:
62c18ce2
GS		 5028 /* list seen where single (scalar) arg expected? */
5029 if (numargs == 1 && !(oa >> 4)
5030 && kid->op_type == OP_LIST && type != OP_SCALAR)
5031 {
5032 return too_many_arguments(o,PL_op_desc[type]);
5033 }
79072805
LW		 5034 scalar(kid);
5035 break;
5036 case OA_LIST:
5037 if (oa < 16) {
5038 kid = 0;
5039 continue;
5040 }
5041 else
5042 list(kid);
5043 break;
5044 case OA_AVREF:
5045 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5046 (kid->op_private & OPpCONST_BARE))
5047 {
2d8e6c8d 5048 char *name = SvPVx(((SVOP*)kid)->op_sv, n_a);
79072805 5049 OP *newop = newAVREF(newGVOP(OP_GV, 0,
85e6fe83 5050 gv_fetchpv(name, TRUE, SVt_PVAV) ));
cf2093f6 5051#ifdef IV_IS_QUAD
b9c39e73 5052 if (ckWARN(WARN_SYNTAX))
cf2093f6
JH		 5053 Perl_warner(aTHX_ WARN_SYNTAX,
5054 "Array @%s missing the @ in argument %" PERL_PRId64 " of %s()",
5055 name, (IV)numargs, PL_op_desc[type]);
5056#else
b9c39e73 5057 if (ckWARN(WARN_SYNTAX))
cea2e8a9 5058 Perl_warner(aTHX_ WARN_SYNTAX,
599cee73 5059 "Array @%s missing the @ in argument %ld of %s()",
22c35a8c 5060 name, (long)numargs, PL_op_desc[type]);
cf2093f6 5061#endif
79072805
LW		 5062 op_free(kid);
5063 kid = newop;
5064 kid->op_sibling = sibl;
5065 *tokid = kid;
5066 }
8990e307 5067 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
35cd451c 5068 bad_type(numargs, "array", PL_op_desc[type], kid);
a0d0e21e 5069 mod(kid, type);
79072805
LW		 5070 break;
5071 case OA_HVREF:
5072 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5073 (kid->op_private & OPpCONST_BARE))
5074 {
2d8e6c8d 5075 char *name = SvPVx(((SVOP*)kid)->op_sv, n_a);
79072805 5076 OP *newop = newHVREF(newGVOP(OP_GV, 0,
85e6fe83 5077 gv_fetchpv(name, TRUE, SVt_PVHV) ));
cf2093f6 5078#ifdef IV_IS_QUAD
b9c39e73 5079 if (ckWARN(WARN_SYNTAX))
cf2093f6
JH		 5080 Perl_warner(aTHX_ WARN_SYNTAX,
5081 "Hash %%%s missing the %% in argument %" PERL_PRId64 " of %s()",
5082 name, (IV)numargs, PL_op_desc[type]);
5083#else
b9c39e73 5084 if (ckWARN(WARN_SYNTAX))
cea2e8a9 5085 Perl_warner(aTHX_ WARN_SYNTAX,
599cee73 5086 "Hash %%%s missing the %% in argument %ld of %s()",
22c35a8c 5087 name, (long)numargs, PL_op_desc[type]);
cf2093f6 5088#endif
79072805
LW		 5089 op_free(kid);
5090 kid = newop;
5091 kid->op_sibling = sibl;
5092 *tokid = kid;
5093 }
8990e307 5094 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
35cd451c 5095 bad_type(numargs, "hash", PL_op_desc[type], kid);
a0d0e21e 5096 mod(kid, type);
79072805
LW		 5097 break;
5098 case OA_CVREF:
5099 {
a0d0e21e 5100 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 5101 kid->op_sibling = 0;
5102 linklist(kid);
5103 newop->op_next = newop;
5104 kid = newop;
5105 kid->op_sibling = sibl;
5106 *tokid = kid;
5107 }
5108 break;
5109 case OA_FILEREF:
c340be78 5110 if (kid->op_type != OP_GV && kid->op_type != OP_RV2GV) {
79072805 5111 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5112 (kid->op_private & OPpCONST_BARE))
5113 {
79072805 5114 OP *newop = newGVOP(OP_GV, 0,
2d8e6c8d 5115 gv_fetchpv(SvPVx(((SVOP*)kid)->op_sv, n_a), TRUE,
85e6fe83 5116 SVt_PVIO) );
79072805
LW		 5117 op_free(kid);
5118 kid = newop;
5119 }
1ea32a52
GS		 5120 else if (kid->op_type == OP_READLINE) {
5121 /* neophyte patrol: open(<FH>), close(<FH>) etc. */
5122 bad_type(numargs, "HANDLE", PL_op_desc[o->op_type], kid);
5123 }
79072805 5124 else {
35cd451c 5125 I32 flags = OPf_SPECIAL;
a6c40364 5126 I32 priv = 0;
35cd451c 5127 /* is this op a FH constructor? */
853846ea 5128 if (is_handle_constructor(o,numargs)) {
1d8d4d2a 5129 flags = 0;
853846ea
NIS		 5130 /* Set a flag to tell rv2gv to vivify
5131 * need to "prove" flag does not mean something
5132 * else already - NI-S 1999/05/07
5133 */
a6c40364 5134 priv = OPpDEREF;
1d8d4d2a
NIS		 5135#if 0
5136 /* Helps with open($array[$n],...)
5137 but is too simplistic - need to do selectively
5138 */
5139 mod(kid,type);
5140#endif
853846ea 5141 }
79072805 5142 kid->op_sibling = 0;
35cd451c 5143 kid = newUNOP(OP_RV2GV, flags, scalar(kid));
a6c40364
GS		 5144 if (priv) {
5145 kid->op_private |= priv;
1d8d4d2a 5146 }
79072805
LW		 5147 }
5148 kid->op_sibling = sibl;
5149 *tokid = kid;
5150 }
5151 scalar(kid);
5152 break;
5153 case OA_SCALARREF:
a0d0e21e 5154 mod(scalar(kid), type);
79072805
LW		 5155 break;
5156 }
5157 oa >>= 4;
5158 tokid = &kid->op_sibling;
5159 kid = kid->op_sibling;
5160 }
11343788 5161 o->op_private |= numargs;
79072805 5162 if (kid)
22c35a8c 5163 return too_many_arguments(o,PL_op_desc[o->op_type]);
11343788 5164 listkids(o);
79072805 5165 }
22c35a8c 5166 else if (PL_opargs[type] & OA_DEFGV) {
11343788 5167 op_free(o);
54b9620d 5168 return newUNOP(type, 0, newDEFSVOP());
a0d0e21e
LW		 5169 }
5170
79072805
LW		 5171 if (oa) {
5172 while (oa & OA_OPTIONAL)
5173 oa >>= 4;
5174 if (oa && oa != OA_LIST)
22c35a8c 5175 return too_few_arguments(o,PL_op_desc[o->op_type]);
79072805 5176 }
11343788 5177 return o;
79072805
LW		 5178}
5179
5180OP *
cea2e8a9 5181Perl_ck_glob(pTHX_ OP *o)
79072805 5182{
fb73857a 5183 GV *gv;
5184
1f2bfc8a 5185 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 5186 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 5187
5188 if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV)) && GvIMPORTED_CV(gv)))
5189 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
b1cb66bf 5190
5191 if (gv && GvIMPORTED_CV(gv)) {
5196be3e 5192 append_elem(OP_GLOB, o,
80252599 5193 newSVOP(OP_CONST, 0, newSViv(PL_glob_index++)));
1f2bfc8a 5194 o->op_type = OP_LIST;
22c35a8c 5195 o->op_ppaddr = PL_ppaddr[OP_LIST];
1f2bfc8a 5196 cLISTOPo->op_first->op_type = OP_PUSHMARK;
22c35a8c 5197 cLISTOPo->op_first->op_ppaddr = PL_ppaddr[OP_PUSHMARK];
1f2bfc8a 5198 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 5199 append_elem(OP_LIST, o,
1f2bfc8a
MB		 5200 scalar(newUNOP(OP_RV2CV, 0,
5201 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 5202 o = newUNOP(OP_NULL, 0, ck_subr(o));
5203 o->op_targ = OP_GLOB; /* hint at what it used to be */
5204 return o;
b1cb66bf 5205 }
5206 gv = newGVgen("main");
a0d0e21e 5207 gv_IOadd(gv);
11343788
MB		 5208 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
5209 scalarkids(o);
5210 return ck_fun(o);
79072805
LW		 5211}
5212
5213OP *
cea2e8a9 5214Perl_ck_grep(pTHX_ OP *o)
79072805
LW		 5215{
5216 LOGOP *gwop;
5217 OP *kid;
11343788 5218 OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
79072805 5219
22c35a8c 5220 o->op_ppaddr = PL_ppaddr[OP_GREPSTART];
b7dc083c 5221 NewOp(1101, gwop, 1, LOGOP);
aeea060c 5222
11343788 5223 if (o->op_flags & OPf_STACKED) {
a0d0e21e 5224 OP* k;
11343788
MB		 5225 o = ck_sort(o);
5226 kid = cLISTOPo->op_first->op_sibling;
5227 for (k = cLISTOPo->op_first->op_sibling->op_next; k; k = k->op_next) {
a0d0e21e
LW		 5228 kid = k;
5229 }
5230 kid->op_next = (OP*)gwop;
11343788 5231 o->op_flags &= ~OPf_STACKED;
93a17b20 5232 }
11343788 5233 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 5234 if (type == OP_MAPWHILE)
5235 list(kid);
5236 else
5237 scalar(kid);
11343788 5238 o = ck_fun(o);
3280af22 5239 if (PL_error_count)
11343788 5240 return o;
aeea060c 5241 kid = cLISTOPo->op_first->op_sibling;
79072805 5242 if (kid->op_type != OP_NULL)
cea2e8a9 5243 Perl_croak(aTHX_ "panic: ck_grep");
79072805
LW		 5244 kid = kUNOP->op_first;
5245
a0d0e21e 5246 gwop->op_type = type;
22c35a8c 5247 gwop->op_ppaddr = PL_ppaddr[type];
11343788 5248 gwop->op_first = listkids(o);
79072805
LW		 5249 gwop->op_flags |= OPf_KIDS;
5250 gwop->op_private = 1;
5251 gwop->op_other = LINKLIST(kid);
a0d0e21e 5252 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
79072805
LW		 5253 kid->op_next = (OP*)gwop;
5254
11343788 5255 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 5256 if (!kid || !kid->op_sibling)
22c35a8c 5257 return too_few_arguments(o,PL_op_desc[o->op_type]);
a0d0e21e
LW		 5258 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
5259 mod(kid, OP_GREPSTART);
5260
79072805
LW		 5261 return (OP*)gwop;
5262}
5263
5264OP *
cea2e8a9 5265Perl_ck_index(pTHX_ OP *o)
79072805 5266{
11343788
MB		 5267 if (o->op_flags & OPf_KIDS) {
5268 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
0b71040e
LW		 5269 if (kid)
5270 kid = kid->op_sibling; /* get past "big" */
79072805 5271 if (kid && kid->op_type == OP_CONST)
2779dcf1 5272 fbm_compile(((SVOP*)kid)->op_sv, 0);
79072805 5273 }
11343788 5274 return ck_fun(o);
79072805
LW		 5275}
5276
5277OP *
cea2e8a9 5278Perl_ck_lengthconst(pTHX_ OP *o)
79072805
LW		 5279{
5280 /* XXX length optimization goes here */
11343788 5281 return ck_fun(o);
79072805
LW		 5282}
5283
5284OP *
cea2e8a9 5285Perl_ck_lfun(pTHX_ OP *o)
79072805 5286{
5dc0d613
MB		 5287 OPCODE type = o->op_type;
5288 return modkids(ck_fun(o), type);
79072805
LW		 5289}
5290
5291OP *
cea2e8a9 5292Perl_ck_defined(pTHX_ OP *o) /* 19990527 MJD */
69794302 5293{
20ce7b12 5294 dTHR;
d0334bed
GS		 5295 if ((o->op_flags & OPf_KIDS) && ckWARN(WARN_DEPRECATED)) {
5296 switch (cUNOPo->op_first->op_type) {
5297 case OP_RV2AV:
7e291ef1 5298 break; /* Globals via GV can be undef */
d0334bed
GS		 5299 case OP_PADAV:
5300 case OP_AASSIGN: /* Is this a good idea? */
5301 Perl_warner(aTHX_ WARN_DEPRECATED,
f10b0346 5302 "defined(@array) is deprecated");
d0334bed
GS		 5303 Perl_warner(aTHX_ WARN_DEPRECATED,
5304 "(Maybe you should just omit the defined()?)\n");
69794302 5305 break;
d0334bed 5306 case OP_RV2HV:
7e291ef1 5307 break; /* Globals via GV can be undef */
d0334bed
GS		 5308 case OP_PADHV:
5309 Perl_warner(aTHX_ WARN_DEPRECATED,
f10b0346 5310 "defined(%hash) is deprecated");
d0334bed
GS		 5311 Perl_warner(aTHX_ WARN_DEPRECATED,
5312 "(Maybe you should just omit the defined()?)\n");
5313 break;
5314 default:
5315 /* no warning */
5316 break;
5317 }
69794302
MJD		 5318 }
5319 return ck_rfun(o);
5320}
5321
5322OP *
cea2e8a9 5323Perl_ck_rfun(pTHX_ OP *o)
8990e307 5324{
5dc0d613
MB		 5325 OPCODE type = o->op_type;
5326 return refkids(ck_fun(o), type);
8990e307
LW		 5327}
5328
5329OP *
cea2e8a9 5330Perl_ck_listiob(pTHX_ OP *o)
79072805
LW		 5331{
5332 register OP *kid;
aeea060c 5333
11343788 5334 kid = cLISTOPo->op_first;
79072805 5335 if (!kid) {
11343788
MB		 5336 o = force_list(o);
5337 kid = cLISTOPo->op_first;
79072805
LW		 5338 }
5339 if (kid->op_type == OP_PUSHMARK)
5340 kid = kid->op_sibling;
11343788 5341 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 5342 kid = kid->op_sibling;
5343 else if (kid && !kid->op_sibling) { /* print HANDLE; */
5344 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 5345 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 5346 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 5347 cLISTOPo->op_first->op_sibling = kid;
5348 cLISTOPo->op_last = kid;
79072805
LW		 5349 kid = kid->op_sibling;
5350 }
5351 }
5352
5353 if (!kid)
54b9620d 5354 append_elem(o->op_type, o, newDEFSVOP());
79072805 5355
5dc0d613 5356 o = listkids(o);
bbce6d69 5357
5dc0d613 5358 o->op_private = 0;
36477c24 5359#ifdef USE_LOCALE
3280af22 5360 if (PL_hints & HINT_LOCALE)
5dc0d613 5361 o->op_private |= OPpLOCALE;
bbce6d69 5362#endif
5363
5dc0d613 5364 return o;
bbce6d69 5365}
5366
5367OP *
cea2e8a9 5368Perl_ck_fun_locale(pTHX_ OP *o)
bbce6d69 5369{
5dc0d613 5370 o = ck_fun(o);
bbce6d69 5371
5dc0d613 5372 o->op_private = 0;
36477c24 5373#ifdef USE_LOCALE
3280af22 5374 if (PL_hints & HINT_LOCALE)
5dc0d613 5375 o->op_private |= OPpLOCALE;
bbce6d69 5376#endif
5377
5dc0d613 5378 return o;
bbce6d69 5379}
5380
5381OP *
b162f9ea
IZ		 5382Perl_ck_sassign(pTHX_ OP *o)
5383{
5384 OP *kid = cLISTOPo->op_first;
5385 /* has a disposable target? */
5386 if ((PL_opargs[kid->op_type] & OA_TARGLEX)
5387 && !(kid->op_flags & OPf_STACKED))
5388 {
5389 OP *kkid = kid->op_sibling;
5390
5391 /* Can just relocate the target. */
2c2d71f5
JH		 5392 if (kkid && kkid->op_type == OP_PADSV
5393 && !(kkid->op_private & OPpLVAL_INTRO))
5394 {
b162f9ea 5395 /* Concat has problems if target is equal to right arg. */
3dbf192b
IZ		 5396 if (kid->op_type == OP_CONCAT) {
5397 if (kLISTOP->op_first->op_sibling->op_type == OP_PADSV
5398 && kLISTOP->op_first->op_sibling->op_targ == kkid->op_targ)
5399 return o;
b162f9ea 5400 }
3dbf192b
IZ		 5401 else if (kid->op_type == OP_JOIN) {
5402 /* do_join has problems if the arguments coincide with target.
c212fd85
IZ		 5403 In fact the second argument *can* safely coincide,
5404 but ignore=pessimize this rare occasion. */
5405 OP *arg = kLISTOP->op_first->op_sibling; /* Skip PUSHMARK */
5406
5407 while (arg) {
5408 if (arg->op_type == OP_PADSV
5409 && arg->op_targ == kkid->op_targ)
5410 return o;
5411 arg = arg->op_sibling;
5412 }
5413 }
3dbf192b
IZ		 5414 else if (kid->op_type == OP_QUOTEMETA) {
5415 /* quotemeta has problems if the argument coincides with target. */
5416 if (kLISTOP->op_first->op_type == OP_PADSV
5417 && kLISTOP->op_first->op_targ == kkid->op_targ)
5418 return o;
5419 }
b162f9ea
IZ		 5420 kid->op_targ = kkid->op_targ;
5421 /* Now we do not need PADSV and SASSIGN. */
5422 kid->op_sibling = o->op_sibling; /* NULL */
5423 cLISTOPo->op_first = NULL;
5424 op_free(o);
5425 op_free(kkid);
5426 kid->op_private |= OPpTARGET_MY; /* Used for context settings */
5427 return kid;
5428 }
5429 }
5430 return o;
5431}
5432
5433OP *
cea2e8a9 5434Perl_ck_scmp(pTHX_ OP *o)
bbce6d69 5435{
5dc0d613 5436 o->op_private = 0;
36477c24 5437#ifdef USE_LOCALE
3280af22 5438 if (PL_hints & HINT_LOCALE)
5dc0d613 5439 o->op_private |= OPpLOCALE;
bbce6d69 5440#endif
36477c24 5441
5dc0d613 5442 return o;
79072805
LW		 5443}
5444
5445OP *
cea2e8a9 5446Perl_ck_match(pTHX_ OP *o)
79072805 5447{
5dc0d613 5448 o->op_private |= OPpRUNTIME;
11343788 5449 return o;
79072805
LW		 5450}
5451
5452OP *
f5d5a27c
CS		 5453Perl_ck_method(pTHX_ OP *o)
5454{
5455 OP *kid = cUNOPo->op_first;
5456 if (kid->op_type == OP_CONST) {
5457 SV* sv = kSVOP->op_sv;
5458 if (!(strchr(SvPVX(sv), ':') || strchr(SvPVX(sv), '\''))) {
5459 OP *cmop;
5460 sv_upgrade(sv, SVt_PVIV);
5461 SvIOK_on(sv);
5462 PERL_HASH(SvUVX(sv), SvPVX(sv), SvCUR(sv));
5463 cmop = newSVOP(OP_METHOD_NAMED, 0, sv);
5464 kSVOP->op_sv = Nullsv;
5465 op_free(o);
5466 return cmop;
5467 }
5468 }
5469 return o;
5470}
5471
5472OP *
cea2e8a9 5473Perl_ck_null(pTHX_ OP *o)
79072805 5474{
11343788 5475 return o;
79072805
LW		 5476}
5477
5478OP *
cea2e8a9 5479Perl_ck_repeat(pTHX_ OP *o)
79072805 5480{
11343788
MB		 5481 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
5482 o->op_private |= OPpREPEAT_DOLIST;
5483 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 5484 }
5485 else
11343788
MB		 5486 scalar(o);
5487 return o;
79072805
LW		 5488}
5489
5490OP *
cea2e8a9 5491Perl_ck_require(pTHX_ OP *o)
8990e307 5492{
11343788
MB		 5493 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
5494 SVOP *kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 5495
5496 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
8990e307 5497 char *s;
a0d0e21e
LW		 5498 for (s = SvPVX(kid->op_sv); *s; s++) {
5499 if (*s == ':' && s[1] == ':') {
5500 *s = '/';
1aef975c 5501 Move(s+2, s+1, strlen(s+2)+1, char);
a0d0e21e
LW		 5502 --SvCUR(kid->op_sv);
5503 }
8990e307 5504 }
a0d0e21e 5505 sv_catpvn(kid->op_sv, ".pm", 3);
8990e307
LW		 5506 }
5507 }
11343788 5508 return ck_fun(o);
8990e307
LW		 5509}
5510
22c35a8c 5511#if 0
8990e307 5512OP *
cea2e8a9 5513Perl_ck_retarget(pTHX_ OP *o)
79072805 5514{
cea2e8a9 5515 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805 5516 /* STUB */
11343788 5517 return o;
79072805 5518}
22c35a8c 5519#endif
79072805
LW		 5520
5521OP *
cea2e8a9 5522Perl_ck_select(pTHX_ OP *o)
79072805 5523{
c07a80fd 5524 OP* kid;
11343788
MB		 5525 if (o->op_flags & OPf_KIDS) {
5526 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 5527 if (kid && kid->op_sibling) {
11343788 5528 o->op_type = OP_SSELECT;
22c35a8c 5529 o->op_ppaddr = PL_ppaddr[OP_SSELECT];
11343788
MB		 5530 o = ck_fun(o);
5531 return fold_constants(o);
79072805
LW		 5532 }
5533 }
11343788
MB		 5534 o = ck_fun(o);
5535 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 5536 if (kid && kid->op_type == OP_RV2GV)
5537 kid->op_private &= ~HINT_STRICT_REFS;
11343788 5538 return o;
79072805
LW		 5539}
5540
5541OP *
cea2e8a9 5542Perl_ck_shift(pTHX_ OP *o)
79072805 5543{
11343788 5544 I32 type = o->op_type;
79072805 5545
11343788 5546 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2
MB		 5547 OP *argop;
5548
11343788 5549 op_free(o);
6d4ff0d2 5550#ifdef USE_THREADS
533c011a 5551 if (!CvUNIQUE(PL_compcv)) {
6d4ff0d2 5552 argop = newOP(OP_PADAV, OPf_REF);
6b88bc9c 5553 argop->op_targ = 0; /* PL_curpad[0] is @_ */
6d4ff0d2
MB		 5554 }
5555 else {
5556 argop = newUNOP(OP_RV2AV, 0,
5557 scalar(newGVOP(OP_GV, 0,
5558 gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
5559 }
5560#else
5561 argop = newUNOP(OP_RV2AV, 0,
3280af22
NIS		 5562 scalar(newGVOP(OP_GV, 0, !CvUNIQUE(PL_compcv) ?
5563 PL_defgv : gv_fetchpv("ARGV", TRUE, SVt_PVAV))));
6d4ff0d2
MB		 5564#endif /* USE_THREADS */
5565 return newUNOP(type, 0, scalar(argop));
79072805 5566 }
11343788 5567 return scalar(modkids(ck_fun(o), type));
79072805
LW		 5568}
5569
5570OP *
cea2e8a9 5571Perl_ck_sort(pTHX_ OP *o)
79072805 5572{
5dc0d613 5573 o->op_private = 0;
36477c24 5574#ifdef USE_LOCALE
3280af22 5575 if (PL_hints & HINT_LOCALE)
5dc0d613 5576 o->op_private |= OPpLOCALE;
bbce6d69 5577#endif
5578
9ea6e965 5579 if (o->op_type == OP_SORT && o->op_flags & OPf_STACKED)
51a19bc0 5580 simplify_sort(o);
9c007264 5581 if (o->op_flags & OPf_STACKED) { /* may have been cleared */
11343788 5582 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
463ee0b2 5583 OP *k;
82092f1d 5584 kid = kUNOP->op_first; /* get past null */
79072805 5585
463ee0b2 5586 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 5587 linklist(kid);
463ee0b2
LW		 5588 if (kid->op_type == OP_SCOPE) {
5589 k = kid->op_next;
5590 kid->op_next = 0;
79072805 5591 }
463ee0b2 5592 else if (kid->op_type == OP_LEAVE) {
11343788 5593 if (o->op_type == OP_SORT) {
748a9306
LW		 5594 null(kid); /* wipe out leave */
5595 kid->op_next = kid;
463ee0b2 5596
748a9306
LW		 5597 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
5598 if (k->op_next == kid)
5599 k->op_next = 0;
5600 }
463ee0b2 5601 }
748a9306
LW		 5602 else
5603 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 5604 k = kLISTOP->op_first;
463ee0b2 5605 }
a0d0e21e
LW		 5606 peep(k);
5607
11343788 5608 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
11343788 5609 if (o->op_type == OP_SORT)
a0d0e21e
LW		 5610 kid->op_next = kid;
5611 else
5612 kid->op_next = k;
11343788 5613 o->op_flags |= OPf_SPECIAL;
79072805 5614 }
c6e96bcb
GS		 5615 else if (kid->op_type == OP_RV2SV || kid->op_type == OP_PADSV)
5616 null(cLISTOPo->op_first->op_sibling);
79072805 5617 }
bbce6d69 5618
11343788 5619 return o;
79072805 5620}
bda4119b
GS		 5621
5622STATIC void
cea2e8a9 5623S_simplify_sort(pTHX_ OP *o)
9c007264 5624{
51a19bc0 5625 dTHR;
9c007264
JH		 5626 register OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
5627 OP *k;
5628 int reversed;
5629 if (!(o->op_flags & OPf_STACKED))
5630 return;
9ea6e965
GS		 5631 GvMULTI_on(gv_fetchpv("a", TRUE, SVt_PV));
5632 GvMULTI_on(gv_fetchpv("b", TRUE, SVt_PV));
82092f1d 5633 kid = kUNOP->op_first; /* get past null */
9c007264
JH		 5634 if (kid->op_type != OP_SCOPE)
5635 return;
5636 kid = kLISTOP->op_last; /* get past scope */
5637 switch(kid->op_type) {
5638 case OP_NCMP:
5639 case OP_I_NCMP:
5640 case OP_SCMP:
5641 break;
5642 default:
5643 return;
5644 }
5645 k = kid; /* remember this node*/
5646 if (kBINOP->op_first->op_type != OP_RV2SV)
5647 return;
5648 kid = kBINOP->op_first; /* get past cmp */
5649 if (kUNOP->op_first->op_type != OP_GV)
5650 return;
5651 kid = kUNOP->op_first; /* get past rv2sv */
5652 if (GvSTASH(kGVOP->op_gv) != PL_curstash)
5653 return;
5654 if (strEQ(GvNAME(kGVOP->op_gv), "a"))
5655 reversed = 0;
5656 else if(strEQ(GvNAME(kGVOP->op_gv), "b"))
5657 reversed = 1;
5658 else
5659 return;
5660 kid = k; /* back to cmp */
5661 if (kBINOP->op_last->op_type != OP_RV2SV)
5662 return;
5663 kid = kBINOP->op_last; /* down to 2nd arg */
5664 if (kUNOP->op_first->op_type != OP_GV)
5665 return;
5666 kid = kUNOP->op_first; /* get past rv2sv */
5667 if (GvSTASH(kGVOP->op_gv) != PL_curstash
5668 || ( reversed
5669 ? strNE(GvNAME(kGVOP->op_gv), "a")
5670 : strNE(GvNAME(kGVOP->op_gv), "b")))
5671 return;
5672 o->op_flags &= ~(OPf_STACKED | OPf_SPECIAL);
5673 if (reversed)
5674 o->op_private |= OPpSORT_REVERSE;
5675 if (k->op_type == OP_NCMP)
5676 o->op_private |= OPpSORT_NUMERIC;
5677 if (k->op_type == OP_I_NCMP)
5678 o->op_private |= OPpSORT_NUMERIC | OPpSORT_INTEGER;
e507f050
SM		 5679 kid = cLISTOPo->op_first->op_sibling;
5680 cLISTOPo->op_first->op_sibling = kid->op_sibling; /* bypass old block */
5681 op_free(kid); /* then delete it */
5682 cLISTOPo->op_children--;
9c007264 5683}
79072805
LW		 5684
5685OP *
cea2e8a9 5686Perl_ck_split(pTHX_ OP *o)
79072805
LW		 5687{
5688 register OP *kid;
aeea060c 5689
11343788
MB		 5690 if (o->op_flags & OPf_STACKED)
5691 return no_fh_allowed(o);
79072805 5692
11343788 5693 kid = cLISTOPo->op_first;
8990e307 5694 if (kid->op_type != OP_NULL)
cea2e8a9 5695 Perl_croak(aTHX_ "panic: ck_split");
8990e307 5696 kid = kid->op_sibling;
11343788
MB		 5697 op_free(cLISTOPo->op_first);
5698 cLISTOPo->op_first = kid;
85e6fe83 5699 if (!kid) {
79cb57f6 5700 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpvn(" ", 1));
11343788 5701 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 5702 }
79072805
LW		 5703
5704 if (kid->op_type != OP_MATCH) {
5705 OP *sibl = kid->op_sibling;
463ee0b2 5706 kid->op_sibling = 0;
79072805 5707 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, Nullop);
11343788
MB		 5708 if (cLISTOPo->op_first == cLISTOPo->op_last)
5709 cLISTOPo->op_last = kid;
5710 cLISTOPo->op_first = kid;
79072805
LW		 5711 kid->op_sibling = sibl;
5712 }
5713
5714 kid->op_type = OP_PUSHRE;
22c35a8c 5715 kid->op_ppaddr = PL_ppaddr[OP_PUSHRE];
79072805
LW		 5716 scalar(kid);
5717
5718 if (!kid->op_sibling)
54b9620d 5719 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 5720
5721 kid = kid->op_sibling;
5722 scalar(kid);
5723
5724 if (!kid->op_sibling)
11343788 5725 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
79072805
LW		 5726
5727 kid = kid->op_sibling;
5728 scalar(kid);
5729
5730 if (kid->op_sibling)
22c35a8c 5731 return too_many_arguments(o,PL_op_desc[o->op_type]);
79072805 5732
11343788 5733 return o;
79072805
LW		 5734}
5735
5736OP *
eb6e2d6f
GS		 5737Perl_ck_join(pTHX_ OP *o)
5738{
5739 if (ckWARN(WARN_SYNTAX)) {
5740 OP *kid = cLISTOPo->op_first->op_sibling;
5741 if (kid && kid->op_type == OP_MATCH) {
5742 char *pmstr = "STRING";
5743 if (kPMOP->op_pmregexp)
5744 pmstr = kPMOP->op_pmregexp->precomp;
5745 Perl_warner(aTHX_ WARN_SYNTAX,
5746 "/%s/ should probably be written as \"%s\"",
5747 pmstr, pmstr);
5748 }
5749 }
5750 return ck_fun(o);
5751}
5752
5753OP *
cea2e8a9 5754Perl_ck_subr(pTHX_ OP *o)
79072805 5755{
11343788
MB		 5756 dTHR;
5757 OP *prev = ((cUNOPo->op_first->op_sibling)
5758 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
5759 OP *o2 = prev->op_sibling;
4633a7c4
LW		 5760 OP *cvop;
5761 char *proto = 0;
5762 CV *cv = 0;
46fc3d4c 5763 GV *namegv = 0;
4633a7c4
LW		 5764 int optional = 0;
5765 I32 arg = 0;
2d8e6c8d 5766 STRLEN n_a;
4633a7c4 5767
d3011074 5768 o->op_private |= OPpENTERSUB_HASTARG;
11343788 5769 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 5770 if (cvop->op_type == OP_RV2CV) {
5771 SVOP* tmpop;
11343788 5772 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
4633a7c4
LW		 5773 null(cvop); /* disable rv2cv */
5774 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
76cd736e 5775 if (tmpop->op_type == OP_GV && !(o->op_private & OPpENTERSUB_AMPER)) {
8ebc5c01 5776 cv = GvCVu(tmpop->op_sv);
76cd736e
GS		 5777 if (!cv)
5778 tmpop->op_private |= OPpEARLY_CV;
5779 else if (SvPOK(cv)) {
46fc3d4c 5780 namegv = CvANON(cv) ? (GV*)tmpop->op_sv : CvGV(cv);
2d8e6c8d 5781 proto = SvPV((SV*)cv, n_a);
46fc3d4c 5782 }
4633a7c4
LW		 5783 }
5784 }
f5d5a27c 5785 else if (cvop->op_type == OP_METHOD || cvop->op_type == OP_METHOD_NAMED) {
7a52d87a
GS		 5786 if (o2->op_type == OP_CONST)
5787 o2->op_private &= ~OPpCONST_STRICT;
58a40671
GS		 5788 else if (o2->op_type == OP_LIST) {
5789 OP *o = ((UNOP*)o2)->op_first->op_sibling;
5790 if (o && o->op_type == OP_CONST)
5791 o->op_private &= ~OPpCONST_STRICT;
5792 }
7a52d87a 5793 }
3280af22
NIS		 5794 o->op_private |= (PL_hints & HINT_STRICT_REFS);
5795 if (PERLDB_SUB && PL_curstash != PL_debstash)
11343788
MB		 5796 o->op_private |= OPpENTERSUB_DB;
5797 while (o2 != cvop) {
4633a7c4
LW		 5798 if (proto) {
5799 switch (*proto) {
5800 case '\0':
5dc0d613 5801 return too_many_arguments(o, gv_ename(namegv));
4633a7c4
LW		 5802 case ';':
5803 optional = 1;
5804 proto++;
5805 continue;
5806 case '$':
5807 proto++;
5808 arg++;
11343788 5809 scalar(o2);
4633a7c4
LW		 5810 break;
5811 case '%':
5812 case '@':
11343788 5813 list(o2);
4633a7c4
LW		 5814 arg++;
5815 break;
5816 case '&':
5817 proto++;
5818 arg++;
11343788 5819 if (o2->op_type != OP_REFGEN && o2->op_type != OP_UNDEF)
5dc0d613 5820 bad_type(arg, "block", gv_ename(namegv), o2);
4633a7c4
LW		 5821 break;
5822 case '*':
2ba6ecf4 5823 /* '*' allows any scalar type, including bareword */
4633a7c4
LW		 5824 proto++;
5825 arg++;
11343788 5826 if (o2->op_type == OP_RV2GV)
2ba6ecf4 5827 goto wrapref; /* autoconvert GLOB -> GLOBref */
7a52d87a
GS		 5828 else if (o2->op_type == OP_CONST)
5829 o2->op_private &= ~OPpCONST_STRICT;
9675f7ac
GS		 5830 else if (o2->op_type == OP_ENTERSUB) {
5831 /* accidental subroutine, revert to bareword */
5832 OP *gvop = ((UNOP*)o2)->op_first;
5833 if (gvop && gvop->op_type == OP_NULL) {
5834 gvop = ((UNOP*)gvop)->op_first;
5835 if (gvop) {
5836 for (; gvop->op_sibling; gvop = gvop->op_sibling)
5837 ;
5838 if (gvop &&
5839 (gvop->op_private & OPpENTERSUB_NOPAREN) &&
5840 (gvop = ((UNOP*)gvop)->op_first) &&
5841 gvop->op_type == OP_GV)
5842 {
5843 GV *gv = (GV*)((SVOP*)gvop)->op_sv;
5844 OP *sibling = o2->op_sibling;
2692f720 5845 SV *n = newSVpvn("",0);
9675f7ac 5846 op_free(o2);
2692f720
GS		 5847 gv_fullname3(n, gv, "");
5848 if (SvCUR(n)>6 && strnEQ(SvPVX(n),"main::",6))
5849 sv_chop(n, SvPVX(n)+6);
5850 o2 = newSVOP(OP_CONST, 0, n);
9675f7ac
GS		 5851 prev->op_sibling = o2;
5852 o2->op_sibling = sibling;
5853 }
5854 }
5855 }
5856 }
2ba6ecf4
GS		 5857 scalar(o2);
5858 break;
4633a7c4
LW		 5859 case '\\':
5860 proto++;
5861 arg++;
5862 switch (*proto++) {
5863 case '*':
11343788 5864 if (o2->op_type != OP_RV2GV)
5dc0d613 5865 bad_type(arg, "symbol", gv_ename(namegv), o2);
4633a7c4
LW		 5866 goto wrapref;
5867 case '&':
11343788 5868 if (o2->op_type != OP_RV2CV)
5dc0d613 5869 bad_type(arg, "sub", gv_ename(namegv), o2);
4633a7c4
LW		 5870 goto wrapref;
5871 case '$':
386acf99
GS		 5872 if (o2->op_type != OP_RV2SV
5873 && o2->op_type != OP_PADSV
1c01eb51
GS		 5874 && o2->op_type != OP_HELEM
5875 && o2->op_type != OP_AELEM
386acf99
GS		 5876 && o2->op_type != OP_THREADSV)
5877 {
5dc0d613 5878 bad_type(arg, "scalar", gv_ename(namegv), o2);
386acf99 5879 }
4633a7c4
LW		 5880 goto wrapref;
5881 case '@':
11343788 5882 if (o2->op_type != OP_RV2AV && o2->op_type != OP_PADAV)
5dc0d613 5883 bad_type(arg, "array", gv_ename(namegv), o2);
4633a7c4
LW		 5884 goto wrapref;
5885 case '%':
11343788 5886 if (o2->op_type != OP_RV2HV && o2->op_type != OP_PADHV)
5dc0d613 5887 bad_type(arg, "hash", gv_ename(namegv), o2);
4633a7c4
LW		 5888 wrapref:
5889 {
11343788 5890 OP* kid = o2;
6fa846a0 5891 OP* sib = kid->op_sibling;
4633a7c4 5892 kid->op_sibling = 0;
6fa846a0
GS		 5893 o2 = newUNOP(OP_REFGEN, 0, kid);
5894 o2->op_sibling = sib;
e858de61 5895 prev->op_sibling = o2;
4633a7c4
LW		 5896 }
5897 break;
5898 default: goto oops;
5899 }
5900 break;
b1cb66bf 5901 case ' ':
5902 proto++;
5903 continue;
4633a7c4
LW		 5904 default:
5905 oops:
cea2e8a9 5906 Perl_croak(aTHX_ "Malformed prototype for %s: %s",
2d8e6c8d 5907 gv_ename(namegv), SvPV((SV*)cv, n_a));
4633a7c4
LW		 5908 }
5909 }
5910 else
11343788
MB		 5911 list(o2);
5912 mod(o2, OP_ENTERSUB);
5913 prev = o2;
5914 o2 = o2->op_sibling;
4633a7c4 5915 }
fb73857a 5916 if (proto && !optional &&
5917 (*proto && *proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 5918 return too_few_arguments(o, gv_ename(namegv));
11343788 5919 return o;
79072805
LW		 5920}
5921
5922OP *
cea2e8a9 5923Perl_ck_svconst(pTHX_ OP *o)
8990e307 5924{
11343788
MB		 5925 SvREADONLY_on(cSVOPo->op_sv);
5926 return o;
8990e307
LW		 5927}
5928
5929OP *
cea2e8a9 5930Perl_ck_trunc(pTHX_ OP *o)
79072805 5931{
11343788
MB		 5932 if (o->op_flags & OPf_KIDS) {
5933 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 5934
a0d0e21e
LW		 5935 if (kid->op_type == OP_NULL)
5936 kid = (SVOP*)kid->op_sibling;
bb53490d
GS		 5937 if (kid && kid->op_type == OP_CONST &&
5938 (kid->op_private & OPpCONST_BARE))
5939 {
11343788 5940 o->op_flags |= OPf_SPECIAL;
bb53490d
GS		 5941 kid->op_private &= ~OPpCONST_STRICT;
5942 }
79072805 5943 }
11343788 5944 return ck_fun(o);
79072805
LW		 5945}
5946
463ee0b2
LW		 5947/* A peephole optimizer. We visit the ops in the order they're to execute. */
5948
79072805 5949void
864dbfa3 5950Perl_peep(pTHX_ register OP *o)
79072805 5951{
11343788 5952 dTHR;
79072805 5953 register OP* oldop = 0;
2d8e6c8d 5954 STRLEN n_a;
cd06dffe 5955 OP *last_composite = Nullop;
2d8e6c8d 5956
a0d0e21e 5957 if (!o || o->op_seq)
79072805 5958 return;
a0d0e21e 5959 ENTER;
462e5cf6 5960 SAVEOP();
3280af22 5961 SAVESPTR(PL_curcop);
a0d0e21e
LW		 5962 for (; o; o = o->op_next) {
5963 if (o->op_seq)
5964 break;
3280af22
NIS		 5965 if (!PL_op_seqmax)
5966 PL_op_seqmax++;
533c011a 5967 PL_op = o;
a0d0e21e 5968 switch (o->op_type) {
acb36ea4 5969 case OP_SETSTATE:
a0d0e21e
LW		 5970 case OP_NEXTSTATE:
5971 case OP_DBSTATE:
3280af22
NIS		 5972 PL_curcop = ((COP*)o); /* for warnings */
5973 o->op_seq = PL_op_seqmax++;
cd06dffe 5974 last_composite = Nullop;
a0d0e21e
LW		 5975 break;
5976
a0d0e21e 5977 case OP_CONST:
7a52d87a
GS		 5978 if (cSVOPo->op_private & OPpCONST_STRICT)
5979 no_bareword_allowed(o);
5980 /* FALL THROUGH */
a0d0e21e
LW		 5981 case OP_UC:
5982 case OP_UCFIRST:
5983 case OP_LC:
5984 case OP_LCFIRST:
ed7ab888
GS		 5985 if ( o->op_next && o->op_next->op_type == OP_STRINGIFY
5986 && !(o->op_next->op_private & OPpTARGET_MY) )
5987 null(o->op_next);
5988 o->op_seq = PL_op_seqmax++;
5989 break;
5990 case OP_CONCAT:
5991 case OP_JOIN:
a0d0e21e 5992 case OP_QUOTEMETA:
b162f9ea
IZ		 5993 if (o->op_next && o->op_next->op_type == OP_STRINGIFY) {
5994 if (o->op_next->op_private & OPpTARGET_MY) {
ed7ab888 5995 if ((o->op_flags & OPf_STACKED) /* chained concats */
b162f9ea
IZ		 5996 || (o->op_type == OP_CONCAT
5997 /* Concat has problems if target is equal to right arg. */
5998 && (((LISTOP*)o)->op_first->op_sibling->op_type
5999 == OP_PADSV)
6000 && (((LISTOP*)o)->op_first->op_sibling->op_targ
6001 == o->op_next->op_targ))) {
6002 goto ignore_optimization;
cd06dffe
GS		 6003 }
6004 else {
b162f9ea 6005 o->op_targ = o->op_next->op_targ;
2c2d71f5 6006 o->op_private |= OPpTARGET_MY;
b162f9ea
IZ		 6007 }
6008 }
a0d0e21e 6009 null(o->op_next);
b162f9ea
IZ		 6010 }
6011 ignore_optimization:
3280af22 6012 o->op_seq = PL_op_seqmax++;
a0d0e21e 6013 break;
8990e307 6014 case OP_STUB:
54310121 6015 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
3280af22 6016 o->op_seq = PL_op_seqmax++;
54310121 6017 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 6018 }
748a9306 6019 goto nothin;
79072805 6020 case OP_NULL:
acb36ea4
GS		 6021 if (o->op_targ == OP_NEXTSTATE
6022 || o->op_targ == OP_DBSTATE
6023 || o->op_targ == OP_SETSTATE)
6024 {
3280af22 6025 PL_curcop = ((COP*)o);
acb36ea4 6026 }
748a9306 6027 goto nothin;
79072805 6028 case OP_SCALAR:
93a17b20 6029 case OP_LINESEQ:
463ee0b2 6030 case OP_SCOPE:
748a9306 6031 nothin:
a0d0e21e
LW		 6032 if (oldop && o->op_next) {
6033 oldop->op_next = o->op_next;
79072805
LW		 6034 continue;
6035 }
3280af22 6036 o->op_seq = PL_op_seqmax++;
79072805
LW		 6037 break;
6038
6039 case OP_GV:
a0d0e21e 6040 if (o->op_next->op_type == OP_RV2SV) {
5f05dabc 6041 if (!(o->op_next->op_private & OPpDEREF)) {
a0d0e21e
LW		 6042 null(o->op_next);
6043 o->op_private |= o->op_next->op_private & OPpLVAL_INTRO;
6044 o->op_next = o->op_next->op_next;
6045 o->op_type = OP_GVSV;
22c35a8c 6046 o->op_ppaddr = PL_ppaddr[OP_GVSV];
8990e307
LW		 6047 }
6048 }
a0d0e21e
LW		 6049 else if (o->op_next->op_type == OP_RV2AV) {
6050 OP* pop = o->op_next->op_next;
6051 IV i;
8990e307 6052 if (pop->op_type == OP_CONST &&
533c011a 6053 (PL_op = pop->op_next) &&
8990e307 6054 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 6055 !(pop->op_next->op_private &
68dc0745 6056 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF)) &&
3280af22 6057 (i = SvIV(((SVOP*)pop)->op_sv) - PL_compiling.cop_arybase)
a0d0e21e 6058 <= 255 &&
8990e307
LW		 6059 i >= 0)
6060 {
a0d0e21e 6061 null(o->op_next);
8990e307
LW		 6062 null(pop->op_next);
6063 null(pop);
a0d0e21e
LW		 6064 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
6065 o->op_next = pop->op_next->op_next;
6066 o->op_type = OP_AELEMFAST;
22c35a8c 6067 o->op_ppaddr = PL_ppaddr[OP_AELEMFAST];
a0d0e21e 6068 o->op_private = (U8)i;
a6006777 6069 GvAVn(((GVOP*)o)->op_gv);
8990e307 6070 }
79072805 6071 }
76cd736e
GS		 6072 else if ((o->op_private & OPpEARLY_CV) && ckWARN(WARN_UNSAFE)) {
6073 GV *gv = cGVOPo->op_gv;
6074 if (SvTYPE(gv) == SVt_PVGV && GvCV(gv) && SvPVX(GvCV(gv))) {
6075 /* XXX could check prototype here instead of just carping */
6076 SV *sv = sv_newmortal();
6077 gv_efullname3(sv, gv, Nullch);
6078 Perl_warner(aTHX_ WARN_UNSAFE,
6079 "%s() called too early to check prototype",
6080 SvPV_nolen(sv));
6081 }
6082 }
6083
3280af22 6084 o->op_seq = PL_op_seqmax++;
79072805
LW		 6085 break;
6086
a0d0e21e 6087 case OP_MAPWHILE:
79072805
LW		 6088 case OP_GREPWHILE:
6089 case OP_AND:
6090 case OP_OR:
2c2d71f5
JH		 6091 case OP_ANDASSIGN:
6092 case OP_ORASSIGN:
1a67a97c
SM		 6093 case OP_COND_EXPR:
6094 case OP_RANGE:
3280af22 6095 o->op_seq = PL_op_seqmax++;
fd4d1407
IZ		 6096 while (cLOGOP->op_other->op_type == OP_NULL)
6097 cLOGOP->op_other = cLOGOP->op_other->op_next;
79072805
LW		 6098 peep(cLOGOP->op_other);
6099 break;
6100
79072805 6101 case OP_ENTERLOOP:
3280af22 6102 o->op_seq = PL_op_seqmax++;
79072805
LW		 6103 peep(cLOOP->op_redoop);
6104 peep(cLOOP->op_nextop);
6105 peep(cLOOP->op_lastop);
6106 break;
6107
8782bef2 6108 case OP_QR:
79072805
LW		 6109 case OP_MATCH:
6110 case OP_SUBST:
3280af22 6111 o->op_seq = PL_op_seqmax++;
a0d0e21e 6112 peep(cPMOP->op_pmreplstart);
79072805
LW		 6113 break;
6114
a0d0e21e 6115 case OP_EXEC:
3280af22 6116 o->op_seq = PL_op_seqmax++;
599cee73
PM		 6117 if (ckWARN(WARN_SYNTAX) && o->op_next
6118 && o->op_next->op_type == OP_NEXTSTATE) {
a0d0e21e 6119 if (o->op_next->op_sibling &&
20408e3c
GS		 6120 o->op_next->op_sibling->op_type != OP_EXIT &&
6121 o->op_next->op_sibling->op_type != OP_WARN &&
a0d0e21e 6122 o->op_next->op_sibling->op_type != OP_DIE) {
3280af22 6123 line_t oldline = PL_curcop->cop_line;
a0d0e21e 6124
3280af22 6125 PL_curcop->cop_line = ((COP*)o->op_next)->cop_line;
cea2e8a9
GS		 6126 Perl_warner(aTHX_ WARN_SYNTAX, "Statement unlikely to be reached");
6127 Perl_warner(aTHX_ WARN_SYNTAX, "(Maybe you meant system() when you said exec()?)\n");
3280af22 6128 PL_curcop->cop_line = oldline;
a0d0e21e
LW		 6129 }
6130 }
6131 break;
aeea060c 6132
c750a3ec
MB		 6133 case OP_HELEM: {
6134 UNOP *rop;
6135 SV *lexname;
6136 GV **fields;
6137 SV **svp, **indsvp;
6138 I32 ind;
6139 char *key;
6140 STRLEN keylen;
aeea060c 6141
377b21bb 6142 if ((o->op_private & (OPpLVAL_INTRO))
c750a3ec
MB		 6143 || ((BINOP*)o)->op_last->op_type != OP_CONST)
6144 break;
6145 rop = (UNOP*)((BINOP*)o)->op_first;
6146 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
6147 break;
3280af22 6148 lexname = *av_fetch(PL_comppad_name, rop->op_first->op_targ, TRUE);
c750a3ec
MB		 6149 if (!SvOBJECT(lexname))
6150 break;
5196be3e 6151 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
c750a3ec
MB		 6152 if (!fields || !GvHV(*fields))
6153 break;
6154 svp = &((SVOP*)((BINOP*)o)->op_last)->op_sv;
6155 key = SvPV(*svp, keylen);
6156 indsvp = hv_fetch(GvHV(*fields), key, keylen, FALSE);
6157 if (!indsvp) {
cea2e8a9 6158 Perl_croak(aTHX_ "No such field \"%s\" in variable %s of type %s",
2d8e6c8d 6159 key, SvPV(lexname, n_a), HvNAME(SvSTASH(lexname)));
c750a3ec
MB		 6160 }
6161 ind = SvIV(*indsvp);
6162 if (ind < 1)
cea2e8a9 6163 Perl_croak(aTHX_ "Bad index while coercing array into hash");
c750a3ec 6164 rop->op_type = OP_RV2AV;
22c35a8c 6165 rop->op_ppaddr = PL_ppaddr[OP_RV2AV];
c750a3ec 6166 o->op_type = OP_AELEM;
22c35a8c 6167 o->op_ppaddr = PL_ppaddr[OP_AELEM];
c750a3ec
MB		 6168 SvREFCNT_dec(*svp);
6169 *svp = newSViv(ind);
6170 break;
6171 }
6172
cd06dffe
GS		 6173 case OP_RV2AV:
6174 case OP_RV2HV:
6175 if (!(o->op_flags & OPf_WANT)
6176 || o->op_flags & OPf_WANT == OPf_WANT_LIST)
6177 last_composite = o;
6178 o->op_seq = PL_op_seqmax++;
6179 break;
6180
6181 case OP_RETURN:
6182 if (o->op_next->op_type != OP_LEAVESUBLV) {
6183 o->op_seq = PL_op_seqmax++;
6184 break;
6185 }
6186 /* FALL THROUGH */
6187
6188 case OP_LEAVESUBLV:
6189 if (last_composite) {
6190 OP *r = last_composite;
6191
6192 while (r->op_sibling)
6193 r = r->op_sibling;
6194 if (r->op_next == o
6195 || (r->op_next->op_type == OP_LIST
6196 && r->op_next->op_next == o))
6197 {
6198 if (last_composite->op_type == OP_RV2AV)
6199 yyerror("Lvalue subs returning arrays not implemented yet");
6200 else
6201 yyerror("Lvalue subs returning hashes not implemented yet");
6202 ;
6203 }
6204 }
6205 /* FALL THROUGH */
6206
79072805 6207 default:
3280af22 6208 o->op_seq = PL_op_seqmax++;
79072805
LW		 6209 break;
6210 }
a0d0e21e 6211 oldop = o;
79072805 6212 }
a0d0e21e 6213 LEAVE;
79072805 6214}
Unnamed repository; edit this file 'description' to name the repository.