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remove redundant part of change#1169 superseded by change#2061;
[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"
19#include "perl.h"
20
76e3520e 21#ifdef PERL_OBJECT
22c35a8c 22#define CHECKCALL this->*PL_check
76e3520e 23#else
22c35a8c 24#define CHECKCALL *PL_check
b7dc083c
NIS		 25#endif
26
27/* #define PL_OP_SLAB_ALLOC */
28
29#ifdef PL_OP_SLAB_ALLOC
30#define SLAB_SIZE 8192
31static char *PL_OpPtr = NULL;
32static int PL_OpSpace = 0;
33#define NewOp(m,var,c,type) do { if ((PL_OpSpace -= c*sizeof(type)) >= 0) \
34 var = (type *)(PL_OpPtr -= c*sizeof(type)); \
35 else \
36 var = (type *) Slab_Alloc(m,c*sizeof(type)); \
37 } while (0)
38
39static void *
40Slab_Alloc(int m, size_t sz)
41{
42 Newz(m,PL_OpPtr,SLAB_SIZE,char);
43 PL_OpSpace = SLAB_SIZE - sz;
44 return PL_OpPtr += PL_OpSpace;
45}
76e3520e 46
b7dc083c
NIS		 47#else
48#define NewOp(m, var, c, type) Newz(m, var, c, type)
49#endif
e50aee73 50/*
5dc0d613 51 * In the following definition, the ", Nullop" is just to make the compiler
a5f75d66 52 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 53 */
11343788 54#define CHECKOP(type,o) \
3280af22 55 ((PL_op_mask && PL_op_mask[type]) \
5dc0d613 56 ? ( op_free((OP*)o), \
22c35a8c 57 croak("%s trapped by operation mask", PL_op_desc[type]), \
28757baa 58 Nullop ) \
76e3520e 59 : (CHECKCALL[type])((OP*)o))
e50aee73 60
c53d7c7d
HS		 61#define PAD_MAX 999999999
62
76e3520e
GS		 63static bool scalar_mod_type _((OP *o, I32 type));
64#ifndef PERL_OBJECT
11343788 65static I32 list_assignment _((OP *o));
3bc5dc61 66static void bad_type _((I32 n, char *t, char *name, OP *kid));
11343788
MB		 67static OP *modkids _((OP *o, I32 type));
68static OP *no_fh_allowed _((OP *o));
69static OP *scalarboolean _((OP *o));
70static OP *too_few_arguments _((OP *o, char* name));
71static OP *too_many_arguments _((OP *o, char* name));
72static void null _((OP* o));
bbce6d69 73static PADOFFSET pad_findlex _((char* name, PADOFFSET newoff, U32 seq,
2680586e 74 CV* startcv, I32 cx_ix, I32 saweval, U32 flags));
54b9620d 75static OP *newDEFSVOP _((void));
883ffac3 76static OP *new_logop _((I32 type, I32 flags, OP **firstp, OP **otherp));
bda4119b 77static void simplify_sort _((OP *o));
35cd451c 78static bool is_handle_constructor _((OP *o, I32 argnum));
76e3520e 79#endif
79072805 80
76e3520e 81STATIC char*
8ac85365 82gv_ename(GV *gv)
4633a7c4 83{
2d8e6c8d 84 STRLEN n_a;
4633a7c4 85 SV* tmpsv = sv_newmortal();
46fc3d4c 86 gv_efullname3(tmpsv, gv, Nullch);
2d8e6c8d 87 return SvPV(tmpsv,n_a);
4633a7c4
LW		 88}
89
76e3520e 90STATIC OP *
8ac85365 91no_fh_allowed(OP *o)
79072805 92{
46fc3d4c 93 yyerror(form("Missing comma after first argument to %s function",
22c35a8c 94 PL_op_desc[o->op_type]));
11343788 95 return o;
79072805
LW		 96}
97
76e3520e 98STATIC OP *
8ac85365 99too_few_arguments(OP *o, char *name)
79072805 100{
46fc3d4c 101 yyerror(form("Not enough arguments for %s", name));
11343788 102 return o;
79072805
LW		 103}
104
76e3520e 105STATIC OP *
8ac85365 106too_many_arguments(OP *o, char *name)
79072805 107{
46fc3d4c 108 yyerror(form("Too many arguments for %s", name));
11343788 109 return o;
79072805
LW		 110}
111
76e3520e 112STATIC void
8ac85365 113bad_type(I32 n, char *t, char *name, OP *kid)
8990e307 114{
46fc3d4c 115 yyerror(form("Type of arg %d to %s must be %s (not %s)",
22c35a8c 116 (int)n, name, t, PL_op_desc[kid->op_type]));
8990e307
LW		 117}
118
a0d0e21e 119void
8ac85365 120assertref(OP *o)
a0d0e21e 121{
11343788 122 int type = o->op_type;
136254bc 123 if (type != OP_AELEM && type != OP_HELEM && type != OP_GELEM) {
22c35a8c 124 yyerror(form("Can't use subscript on %s", PL_op_desc[type]));
bde90e66 125 if (type == OP_ENTERSUB || type == OP_RV2HV || type == OP_PADHV) {
9c82454c 126 dTHR;
bde90e66
HS		 127 SV *msg = sv_2mortal(
128 newSVpvf("(Did you mean $ or @ instead of %c?)\n",
129 type == OP_ENTERSUB ? '&' : '%'));
3280af22 130 if (PL_in_eval & 2)
bde90e66 131 warn("%_", msg);
3280af22
NIS		 132 else if (PL_in_eval)
133 sv_catsv(GvSV(PL_errgv), msg);
bde90e66
HS		 134 else
135 PerlIO_write(PerlIO_stderr(), SvPVX(msg), SvCUR(msg));
136 }
a0d0e21e
LW		 137 }
138}
139
79072805
LW		 140/* "register" allocation */
141
142PADOFFSET
8ac85365 143pad_allocmy(char *name)
93a17b20 144{
11343788 145 dTHR;
a0d0e21e
LW		 146 PADOFFSET off;
147 SV *sv;
148
834a4ddd
LW		 149 if (!(
150 isALPHA(name[1]) ||
151 (PL_hints & HINT_UTF8 && (name[1] & 0xc0) == 0xc0) ||
152 name[1] == '_' && (int)strlen(name) > 2))
153 {
46fc3d4c 154 if (!isPRINT(name[1])) {
2b92dfce
GS		 155 /* 1999-02-27 mjd@plover.com */
156 char *p;
157 p = strchr(name, '\0');
158 /* The next block assumes the buffer is at least 205 chars
159 long. At present, it's always at least 256 chars. */
160 if (p-name > 200) {
161 strcpy(name+200, "...");
162 p = name+199;
163 }
164 else {
165 p[1] = '\0';
166 }
167 /* Move everything else down one character */
168 for (; p-name > 2; p--)
169 *p = *(p-1);
46fc3d4c 170 name[2] = toCTRL(name[1]);
171 name[1] = '^';
172 }
dce40276 173 yyerror(form("Can't use global %s in \"my\"",name));
a0d0e21e 174 }
599cee73 175 if (ckWARN(WARN_UNSAFE) && AvFILLp(PL_comppad_name) >= 0) {
3280af22
NIS		 176 SV **svp = AvARRAY(PL_comppad_name);
177 for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_floor; off--) {
b1cb66bf 178 if ((sv = svp[off])
3280af22 179 && sv != &PL_sv_undef
c53d7c7d 180 && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
b1cb66bf 181 && strEQ(name, SvPVX(sv)))
182 {
599cee73 183 warner(WARN_UNSAFE,
9fbbe825 184 "\"my\" variable %s masks earlier declaration in same %s",
c53d7c7d 185 name, (SvIVX(sv) == PAD_MAX ? "scope" : "statement"));
b1cb66bf 186 break;
187 }
188 }
189 }
a0d0e21e
LW		 190 off = pad_alloc(OP_PADSV, SVs_PADMY);
191 sv = NEWSV(1102,0);
93a17b20
LW		 192 sv_upgrade(sv, SVt_PVNV);
193 sv_setpv(sv, name);
3280af22 194 if (PL_in_my_stash) {
c750a3ec 195 if (*name != '$')
dce40276
GS		 196 yyerror(form("Can't declare class for non-scalar %s in \"my\"",
197 name));
c750a3ec
MB		 198 SvOBJECT_on(sv);
199 (void)SvUPGRADE(sv, SVt_PVMG);
3280af22
NIS		 200 SvSTASH(sv) = (HV*)SvREFCNT_inc(PL_in_my_stash);
201 PL_sv_objcount++;
c750a3ec 202 }
3280af22 203 av_store(PL_comppad_name, off, sv);
c53d7c7d 204 SvNVX(sv) = (double)PAD_MAX;
8990e307 205 SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
3280af22
NIS		 206 if (!PL_min_intro_pending)
207 PL_min_intro_pending = off;
208 PL_max_intro_pending = off;
93a17b20 209 if (*name == '@')
3280af22 210 av_store(PL_comppad, off, (SV*)newAV());
93a17b20 211 else if (*name == '%')
3280af22
NIS		 212 av_store(PL_comppad, off, (SV*)newHV());
213 SvPADMY_on(PL_curpad[off]);
93a17b20
LW		 214 return off;
215}
216
2680586e
GS		 217#define FINDLEX_NOSEARCH 1 /* don't search outer contexts */
218
76e3520e 219STATIC PADOFFSET
2680586e
GS		 220pad_findlex(char *name, PADOFFSET newoff, U32 seq, CV* startcv, I32 cx_ix, I32 saweval,
221 U32 flags)
93a17b20 222{
11343788 223 dTHR;
748a9306 224 CV *cv;
93a17b20
LW		 225 I32 off;
226 SV *sv;
93a17b20 227 register I32 i;
c09156bb 228 register PERL_CONTEXT *cx;
93a17b20 229
748a9306 230 for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
4fdae800 231 AV *curlist = CvPADLIST(cv);
232 SV **svp = av_fetch(curlist, 0, FALSE);
748a9306 233 AV *curname;
4fdae800 234
3280af22 235 if (!svp || *svp == &PL_sv_undef)
4633a7c4 236 continue;
748a9306
LW		 237 curname = (AV*)*svp;
238 svp = AvARRAY(curname);
93965878 239 for (off = AvFILLp(curname); off > 0; off--) {
748a9306 240 if ((sv = svp[off]) &&
3280af22 241 sv != &PL_sv_undef &&
748a9306 242 seq <= SvIVX(sv) &&
13826f2c 243 seq > I_32(SvNVX(sv)) &&
748a9306
LW		 244 strEQ(SvPVX(sv), name))
245 {
5f05dabc 246 I32 depth;
247 AV *oldpad;
248 SV *oldsv;
249
250 depth = CvDEPTH(cv);
251 if (!depth) {
9607fc9c 252 if (newoff) {
253 if (SvFAKE(sv))
254 continue;
4fdae800 255 return 0; /* don't clone from inactive stack frame */
9607fc9c 256 }
5f05dabc 257 depth = 1;
258 }
259 oldpad = (AV*)*av_fetch(curlist, depth, FALSE);
260 oldsv = *av_fetch(oldpad, off, TRUE);
748a9306 261 if (!newoff) { /* Not a mere clone operation. */
9607fc9c 262 SV *namesv = NEWSV(1103,0);
748a9306 263 newoff = pad_alloc(OP_PADSV, SVs_PADMY);
9607fc9c 264 sv_upgrade(namesv, SVt_PVNV);
265 sv_setpv(namesv, name);
3280af22
NIS		 266 av_store(PL_comppad_name, newoff, namesv);
267 SvNVX(namesv) = (double)PL_curcop->cop_seq;
c53d7c7d 268 SvIVX(namesv) = PAD_MAX; /* A ref, intro immediately */
9607fc9c 269 SvFAKE_on(namesv); /* A ref, not a real var */
87671ffc 270 if (SvOBJECT(sv)) { /* A typed var */
3d93dc8b
GS		 271 SvOBJECT_on(namesv);
272 (void)SvUPGRADE(namesv, SVt_PVMG);
87671ffc 273 SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*)SvSTASH(sv));
3d93dc8b
GS		 274 PL_sv_objcount++;
275 }
3280af22 276 if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) {
28757baa 277 /* "It's closures all the way down." */
3280af22 278 CvCLONE_on(PL_compcv);
54310121 279 if (cv == startcv) {
3280af22 280 if (CvANON(PL_compcv))
54310121 281 oldsv = Nullsv; /* no need to keep ref */
282 }
283 else {
28757baa 284 CV *bcv;
285 for (bcv = startcv;
286 bcv && bcv != cv && !CvCLONE(bcv);
6b35e009
GS		 287 bcv = CvOUTSIDE(bcv))
288 {
28757baa 289 if (CvANON(bcv))
290 CvCLONE_on(bcv);
291 else {
6b35e009
GS		 292 if (ckWARN(WARN_CLOSURE)
293 && !CvUNIQUE(bcv) && !CvUNIQUE(cv))
294 {
599cee73 295 warner(WARN_CLOSURE,
44a8e56a 296 "Variable \"%s\" may be unavailable",
28757baa 297 name);
6b35e009 298 }
28757baa 299 break;
300 }
301 }
302 }
303 }
3280af22 304 else if (!CvUNIQUE(PL_compcv)) {
599cee73
PM		 305 if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv))
306 warner(WARN_CLOSURE,
307 "Variable \"%s\" will not stay shared", name);
5f05dabc 308 }
748a9306 309 }
3280af22 310 av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv));
748a9306
LW		 311 return newoff;
312 }
93a17b20
LW		 313 }
314 }
315
2680586e
GS		 316 if (flags & FINDLEX_NOSEARCH)
317 return 0;
318
93a17b20
LW		 319 /* Nothing in current lexical context--try eval's context, if any.
320 * This is necessary to let the perldb get at lexically scoped variables.
321 * XXX This will also probably interact badly with eval tree caching.
322 */
323
748a9306 324 for (i = cx_ix; i >= 0; i--) {
93a17b20 325 cx = &cxstack[i];
6b35e009 326 switch (CxTYPE(cx)) {
93a17b20 327 default:
748a9306
LW		 328 if (i == 0 && saweval) {
329 seq = cxstack[saweval].blk_oldcop->cop_seq;
2680586e 330 return pad_findlex(name, newoff, seq, PL_main_cv, -1, saweval, 0);
748a9306 331 }
93a17b20
LW		 332 break;
333 case CXt_EVAL:
44a8e56a 334 switch (cx->blk_eval.old_op_type) {
335 case OP_ENTEREVAL:
6b35e009
GS		 336 if (CxREALEVAL(cx))
337 saweval = i;
44a8e56a 338 break;
339 case OP_REQUIRE:
340 /* require must have its own scope */
341 return 0;
342 }
93a17b20
LW		 343 break;
344 case CXt_SUB:
345 if (!saweval)
346 return 0;
347 cv = cx->blk_sub.cv;
3280af22 348 if (PL_debstash && CvSTASH(cv) == PL_debstash) { /* ignore DB'* scope */
748a9306 349 saweval = i; /* so we know where we were called from */
93a17b20 350 continue;
93a17b20 351 }
748a9306 352 seq = cxstack[saweval].blk_oldcop->cop_seq;
2680586e 353 return pad_findlex(name, newoff, seq, cv, i-1, saweval,FINDLEX_NOSEARCH);
93a17b20
LW		 354 }
355 }
356
748a9306
LW		 357 return 0;
358}
a0d0e21e 359
748a9306 360PADOFFSET
8ac85365 361pad_findmy(char *name)
748a9306 362{
11343788 363 dTHR;
748a9306 364 I32 off;
54310121 365 I32 pendoff = 0;
748a9306 366 SV *sv;
3280af22
NIS		 367 SV **svp = AvARRAY(PL_comppad_name);
368 U32 seq = PL_cop_seqmax;
6b35e009 369 PERL_CONTEXT *cx;
33b8ce05 370 CV *outside;
748a9306 371
11343788
MB		 372#ifdef USE_THREADS
373 /*
374 * Special case to get lexical (and hence per-thread) @_.
375 * XXX I need to find out how to tell at parse-time whether use
376 * of @_ should refer to a lexical (from a sub) or defgv (global
377 * scope and maybe weird sub-ish things like formats). See
378 * startsub in perly.y. It's possible that @_ could be lexical
379 * (at least from subs) even in non-threaded perl.
380 */
381 if (strEQ(name, "@_"))
382 return 0; /* success. (NOT_IN_PAD indicates failure) */
383#endif /* USE_THREADS */
384
748a9306 385 /* The one we're looking for is probably just before comppad_name_fill. */
3280af22 386 for (off = AvFILLp(PL_comppad_name); off > 0; off--) {
a0d0e21e 387 if ((sv = svp[off]) &&
3280af22 388 sv != &PL_sv_undef &&
54310121 389 (!SvIVX(sv) ||
390 (seq <= SvIVX(sv) &&
391 seq > I_32(SvNVX(sv)))) &&
a0d0e21e
LW		 392 strEQ(SvPVX(sv), name))
393 {
54310121 394 if (SvIVX(sv))
395 return (PADOFFSET)off;
396 pendoff = off; /* this pending def. will override import */
a0d0e21e
LW		 397 }
398 }
748a9306 399
33b8ce05
GS		 400 outside = CvOUTSIDE(PL_compcv);
401
402 /* Check if if we're compiling an eval'', and adjust seq to be the
403 * eval's seq number. This depends on eval'' having a non-null
404 * CvOUTSIDE() while it is being compiled. The eval'' itself is
1aff0e91
GS		 405 * identified by CvEVAL being true and CvGV being null. */
406 if (outside && CvEVAL(PL_compcv) && !CvGV(PL_compcv) && cxstack_ix >= 0) {
6b35e009
GS		 407 cx = &cxstack[cxstack_ix];
408 if (CxREALEVAL(cx))
409 seq = cx->blk_oldcop->cop_seq;
410 }
411
748a9306 412 /* See if it's in a nested scope */
2680586e 413 off = pad_findlex(name, 0, seq, outside, cxstack_ix, 0, 0);
54310121 414 if (off) {
415 /* If there is a pending local definition, this new alias must die */
416 if (pendoff)
3280af22 417 SvIVX(AvARRAY(PL_comppad_name)[off]) = seq;
11343788 418 return off; /* pad_findlex returns 0 for failure...*/
54310121 419 }
11343788 420 return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */
93a17b20
LW		 421}
422
423void
8ac85365 424pad_leavemy(I32 fill)
93a17b20
LW		 425{
426 I32 off;
3280af22 427 SV **svp = AvARRAY(PL_comppad_name);
93a17b20 428 SV *sv;
3280af22
NIS		 429 if (PL_min_intro_pending && fill < PL_min_intro_pending) {
430 for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
431 if ((sv = svp[off]) && sv != &PL_sv_undef)
8990e307
LW		 432 warn("%s never introduced", SvPVX(sv));
433 }
434 }
435 /* "Deintroduce" my variables that are leaving with this scope. */
3280af22 436 for (off = AvFILLp(PL_comppad_name); off > fill; off--) {
c53d7c7d 437 if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == PAD_MAX)
3280af22 438 SvIVX(sv) = PL_cop_seqmax;
93a17b20
LW		 439 }
440}
441
442PADOFFSET
8ac85365 443pad_alloc(I32 optype, U32 tmptype)
79072805 444{
11343788 445 dTHR;
79072805
LW		 446 SV *sv;
447 I32 retval;
448
3280af22 449 if (AvARRAY(PL_comppad) != PL_curpad)
463ee0b2 450 croak("panic: pad_alloc");
3280af22 451 if (PL_pad_reset_pending)
a0d0e21e 452 pad_reset();
ed6116ce 453 if (tmptype & SVs_PADMY) {
79072805 454 do {
3280af22 455 sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
ed6116ce 456 } while (SvPADBUSY(sv)); /* need a fresh one */
3280af22 457 retval = AvFILLp(PL_comppad);
79072805
LW		 458 }
459 else {
3280af22
NIS		 460 SV **names = AvARRAY(PL_comppad_name);
461 SSize_t names_fill = AvFILLp(PL_comppad_name);
bbce6d69 462 for (;;) {
463 /*
464 * "foreach" index vars temporarily become aliases to non-"my"
465 * values. Thus we must skip, not just pad values that are
466 * marked as current pad values, but also those with names.
467 */
3280af22
NIS		 468 if (++PL_padix <= names_fill &&
469 (sv = names[PL_padix]) && sv != &PL_sv_undef)
bbce6d69 470 continue;
3280af22 471 sv = *av_fetch(PL_comppad, PL_padix, TRUE);
bbce6d69 472 if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
473 break;
474 }
3280af22 475 retval = PL_padix;
79072805 476 }
8990e307 477 SvFLAGS(sv) |= tmptype;
3280af22 478 PL_curpad = AvARRAY(PL_comppad);
11343788 479#ifdef USE_THREADS
5dc0d613 480 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
533c011a 481 (unsigned long) thr, (unsigned long) PL_curpad,
22c35a8c 482 (long) retval, PL_op_name[optype]));
11343788 483#else
d9bb4600 484 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx alloc %ld for %s\n",
3280af22 485 (unsigned long) PL_curpad,
22c35a8c 486 (long) retval, PL_op_name[optype]));
11343788 487#endif /* USE_THREADS */
79072805
LW		 488 return (PADOFFSET)retval;
489}
490
491SV *
8990e307 492pad_sv(PADOFFSET po)
79072805 493{
11343788
MB		 494 dTHR;
495#ifdef USE_THREADS
5dc0d613 496 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
533c011a 497 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 498#else
79072805 499 if (!po)
463ee0b2 500 croak("panic: pad_sv po");
d9bb4600 501 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx sv %d\n",
3280af22 502 (unsigned long) PL_curpad, po));
11343788 503#endif /* USE_THREADS */
3280af22 504 return PL_curpad[po]; /* eventually we'll turn this into a macro */
79072805
LW		 505}
506
507void
8990e307 508pad_free(PADOFFSET po)
79072805 509{
11343788 510 dTHR;
3280af22 511 if (!PL_curpad)
a0d0e21e 512 return;
3280af22 513 if (AvARRAY(PL_comppad) != PL_curpad)
463ee0b2 514 croak("panic: pad_free curpad");
79072805 515 if (!po)
463ee0b2 516 croak("panic: pad_free po");
11343788 517#ifdef USE_THREADS
5dc0d613 518 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
533c011a 519 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 520#else
d9bb4600 521 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx free %d\n",
3280af22 522 (unsigned long) PL_curpad, po));
11343788 523#endif /* USE_THREADS */
3280af22
NIS		 524 if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef)
525 SvPADTMP_off(PL_curpad[po]);
526 if ((I32)po < PL_padix)
527 PL_padix = po - 1;
79072805
LW		 528}
529
530void
8990e307 531pad_swipe(PADOFFSET po)
79072805 532{
11343788 533 dTHR;
3280af22 534 if (AvARRAY(PL_comppad) != PL_curpad)
463ee0b2 535 croak("panic: pad_swipe curpad");
79072805 536 if (!po)
463ee0b2 537 croak("panic: pad_swipe po");
11343788 538#ifdef USE_THREADS
5dc0d613 539 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
533c011a 540 (unsigned long) thr, (unsigned long) PL_curpad, po));
11343788 541#else
d9bb4600 542 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx swipe %d\n",
3280af22 543 (unsigned long) PL_curpad, po));
11343788 544#endif /* USE_THREADS */
3280af22
NIS		 545 SvPADTMP_off(PL_curpad[po]);
546 PL_curpad[po] = NEWSV(1107,0);
547 SvPADTMP_on(PL_curpad[po]);
548 if ((I32)po < PL_padix)
549 PL_padix = po - 1;
79072805
LW		 550}
551
d9bb4600
GS		 552/* XXX pad_reset() is currently disabled because it results in serious bugs.
553 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
554 * on the stack by OPs that use them, there are several ways to get an alias
555 * to a shared TARG. Such an alias will change randomly and unpredictably.
556 * We avoid doing this until we can think of a Better Way.
557 * GSAR 97-10-29 */
79072805 558void
8ac85365 559pad_reset(void)
79072805 560{
d9bb4600 561#ifdef USE_BROKEN_PAD_RESET
11343788 562 dTHR;
79072805
LW		 563 register I32 po;
564
6b88bc9c 565 if (AvARRAY(PL_comppad) != PL_curpad)
463ee0b2 566 croak("panic: pad_reset curpad");
11343788 567#ifdef USE_THREADS
5dc0d613 568 DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
6b88bc9c 569 (unsigned long) thr, (unsigned long) PL_curpad));
11343788 570#else
d9bb4600 571 DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx reset\n",
6b88bc9c 572 (unsigned long) PL_curpad));
11343788 573#endif /* USE_THREADS */
6b88bc9c
GS		 574 if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */
575 for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
576 if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
577 SvPADTMP_off(PL_curpad[po]);
748a9306 578 }
6b88bc9c 579 PL_padix = PL_padix_floor;
79072805 580 }
d9bb4600 581#endif
3280af22 582 PL_pad_reset_pending = FALSE;
79072805
LW		 583}
584
a863c7d1 585#ifdef USE_THREADS
54b9620d 586/* find_threadsv is not reentrant */
a863c7d1 587PADOFFSET
08105a92 588find_threadsv(const char *name)
a863c7d1
MB		 589{
590 dTHR;
591 char *p;
592 PADOFFSET key;
554b3eca 593 SV **svp;
54b9620d 594 /* We currently only handle names of a single character */
533c011a 595 p = strchr(PL_threadsv_names, *name);
a863c7d1
MB		 596 if (!p)
597 return NOT_IN_PAD;
533c011a 598 key = p - PL_threadsv_names;
2d8e6c8d 599 MUTEX_LOCK(&thr->mutex);
54b9620d 600 svp = av_fetch(thr->threadsv, key, FALSE);
2d8e6c8d
GS		 601 if (svp)
602 MUTEX_UNLOCK(&thr->mutex);
603 else {
554b3eca 604 SV *sv = NEWSV(0, 0);
54b9620d 605 av_store(thr->threadsv, key, sv);
940cb80d 606 thr->threadsvp = AvARRAY(thr->threadsv);
2d8e6c8d 607 MUTEX_UNLOCK(&thr->mutex);
554b3eca
MB		 608 /*
609 * Some magic variables used to be automagically initialised
610 * in gv_fetchpv. Those which are now per-thread magicals get
611 * initialised here instead.
612 */
613 switch (*name) {
54b9620d
MB		 614 case '_':
615 break;
554b3eca
MB		 616 case ';':
617 sv_setpv(sv, "\034");
54b9620d 618 sv_magic(sv, 0, 0, name, 1);
554b3eca 619 break;
c277df42
IZ		 620 case '&':
621 case '`':
622 case '\'':
533c011a 623 PL_sawampersand = TRUE;
a3f914c5
GS		 624 /* FALL THROUGH */
625 case '1':
626 case '2':
627 case '3':
628 case '4':
629 case '5':
630 case '6':
631 case '7':
632 case '8':
633 case '9':
c277df42 634 SvREADONLY_on(sv);
d8b5173a 635 /* FALL THROUGH */
067391ea
GS		 636
637 /* XXX %! tied to Errno.pm needs to be added here.
638 * See gv_fetchpv(). */
639 /* case '!': */
640
54b9620d
MB		 641 default:
642 sv_magic(sv, 0, 0, name, 1);
554b3eca 643 }
8b73bbec 644 DEBUG_S(PerlIO_printf(PerlIO_stderr(),
54b9620d 645 "find_threadsv: new SV %p for $%s%c\n",
554b3eca
MB		 646 sv, (*name < 32) ? "^" : "",
647 (*name < 32) ? toCTRL(*name) : *name));
a863c7d1
MB		 648 }
649 return key;
650}
651#endif /* USE_THREADS */
652
79072805
LW		 653/* Destructor */
654
655void
8ac85365 656op_free(OP *o)
79072805 657{
85e6fe83 658 register OP *kid, *nextkid;
79072805 659
5dc0d613 660 if (!o || o->op_seq == (U16)-1)
79072805
LW		 661 return;
662
11343788
MB		 663 if (o->op_flags & OPf_KIDS) {
664 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 665 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 666 op_free(kid);
85e6fe83 667 }
79072805
LW		 668 }
669
11343788 670 switch (o->op_type) {
8990e307 671 case OP_NULL:
11343788 672 o->op_targ = 0; /* Was holding old type, if any. */
8990e307 673 break;
a0d0e21e 674 case OP_ENTEREVAL:
11343788 675 o->op_targ = 0; /* Was holding hints. */
a0d0e21e 676 break;
554b3eca 677#ifdef USE_THREADS
8dd3ba40
SM		 678 case OP_ENTERITER:
679 if (!(o->op_flags & OPf_SPECIAL))
680 break;
681 /* FALL THROUGH */
2faa37cc 682 case OP_THREADSV:
54b9620d 683 o->op_targ = 0; /* Was holding index into thr->threadsv AV. */
554b3eca
MB		 684 break;
685#endif /* USE_THREADS */
a6006777 686 default:
ac4c12e7 687 if (!(o->op_flags & OPf_REF)
22c35a8c 688 || (PL_check[o->op_type] != FUNC_NAME_TO_PTR(ck_ftst)))
a6006777 689 break;
690 /* FALL THROUGH */
463ee0b2 691 case OP_GVSV:
79072805 692 case OP_GV:
a6006777 693 case OP_AELEMFAST:
11343788 694 SvREFCNT_dec(cGVOPo->op_gv);
8990e307
LW		 695 break;
696 case OP_NEXTSTATE:
697 case OP_DBSTATE:
5196be3e 698 Safefree(cCOPo->cop_label);
11343788 699 SvREFCNT_dec(cCOPo->cop_filegv);
599cee73
PM		 700 if (cCOPo->cop_warnings != WARN_NONE && cCOPo->cop_warnings != WARN_ALL)
701 SvREFCNT_dec(cCOPo->cop_warnings);
79072805
LW		 702 break;
703 case OP_CONST:
11343788 704 SvREFCNT_dec(cSVOPo->op_sv);
79072805 705 break;
748a9306
LW		 706 case OP_GOTO:
707 case OP_NEXT:
708 case OP_LAST:
709 case OP_REDO:
11343788 710 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 711 break;
712 /* FALL THROUGH */
a0d0e21e 713 case OP_TRANS:
a0ed51b3
LW		 714 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF))
715 SvREFCNT_dec(cSVOPo->op_sv);
716 else
717 Safefree(cPVOPo->op_pv);
a0d0e21e
LW		 718 break;
719 case OP_SUBST:
11343788 720 op_free(cPMOPo->op_pmreplroot);
a0d0e21e 721 /* FALL THROUGH */
748a9306 722 case OP_PUSHRE:
a0d0e21e 723 case OP_MATCH:
8782bef2 724 case OP_QR:
c277df42 725 ReREFCNT_dec(cPMOPo->op_pmregexp);
a0d0e21e 726 break;
79072805
LW		 727 }
728
11343788
MB		 729 if (o->op_targ > 0)
730 pad_free(o->op_targ);
8990e307 731
b7dc083c
NIS		 732#ifdef PL_OP_SLAB_ALLOC
733 if ((char *) o == PL_OpPtr)
734 {
735 }
736#else
11343788 737 Safefree(o);
b7dc083c 738#endif
79072805
LW		 739}
740
76e3520e 741STATIC void
8ac85365 742null(OP *o)
8990e307 743{
54b9620d 744 if (o->op_type != OP_NULL && o->op_type != OP_THREADSV && o->op_targ > 0)
11343788
MB		 745 pad_free(o->op_targ);
746 o->op_targ = o->op_type;
747 o->op_type = OP_NULL;
22c35a8c 748 o->op_ppaddr = PL_ppaddr[OP_NULL];
8990e307
LW		 749}
750
79072805
LW		 751/* Contextualizers */
752
463ee0b2 753#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 754
755OP *
8ac85365 756linklist(OP *o)
79072805
LW		 757{
758 register OP *kid;
759
11343788
MB		 760 if (o->op_next)
761 return o->op_next;
79072805
LW		 762
763 /* establish postfix order */
11343788
MB		 764 if (cUNOPo->op_first) {
765 o->op_next = LINKLIST(cUNOPo->op_first);
766 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 767 if (kid->op_sibling)
768 kid->op_next = LINKLIST(kid->op_sibling);
769 else
11343788 770 kid->op_next = o;
79072805
LW		 771 }
772 }
773 else
11343788 774 o->op_next = o;
79072805 775
11343788 776 return o->op_next;
79072805
LW		 777}
778
779OP *
8ac85365 780scalarkids(OP *o)
79072805
LW		 781{
782 OP *kid;
11343788
MB		 783 if (o && o->op_flags & OPf_KIDS) {
784 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 785 scalar(kid);
786 }
11343788 787 return o;
79072805
LW		 788}
789
76e3520e 790STATIC OP *
8ac85365 791scalarboolean(OP *o)
8990e307 792{
d008e5eb 793 if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
0f15f207 794 dTHR;
d008e5eb
GS		 795 if (ckWARN(WARN_SYNTAX)) {
796 line_t oldline = PL_curcop->cop_line;
a0d0e21e 797
d008e5eb
GS		 798 if (PL_copline != NOLINE)
799 PL_curcop->cop_line = PL_copline;
800 warner(WARN_SYNTAX, "Found = in conditional, should be ==");
801 PL_curcop->cop_line = oldline;
802 }
a0d0e21e 803 }
11343788 804 return scalar(o);
8990e307
LW		 805}
806
807OP *
8ac85365 808scalar(OP *o)
79072805
LW		 809{
810 OP *kid;
811
a0d0e21e 812 /* assumes no premature commitment */
3280af22 813 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 814 || o->op_type == OP_RETURN)
11343788 815 return o;
79072805 816
5dc0d613 817 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 818
11343788 819 switch (o->op_type) {
79072805 820 case OP_REPEAT:
11343788
MB		 821 if (o->op_private & OPpREPEAT_DOLIST)
822 null(((LISTOP*)cBINOPo->op_first)->op_first);
823 scalar(cBINOPo->op_first);
8990e307 824 break;
79072805
LW		 825 case OP_OR:
826 case OP_AND:
827 case OP_COND_EXPR:
11343788 828 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 829 scalar(kid);
79072805 830 break;
a0d0e21e 831 case OP_SPLIT:
11343788 832 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 833 if (!kPMOP->op_pmreplroot)
834 deprecate("implicit split to @_");
835 }
836 /* FALL THROUGH */
79072805 837 case OP_MATCH:
8782bef2 838 case OP_QR:
79072805
LW		 839 case OP_SUBST:
840 case OP_NULL:
8990e307 841 default:
11343788
MB		 842 if (o->op_flags & OPf_KIDS) {
843 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 844 scalar(kid);
845 }
79072805
LW		 846 break;
847 case OP_LEAVE:
848 case OP_LEAVETRY:
5dc0d613 849 kid = cLISTOPo->op_first;
54310121 850 scalar(kid);
851 while (kid = kid->op_sibling) {
852 if (kid->op_sibling)
853 scalarvoid(kid);
854 else
855 scalar(kid);
856 }
3280af22 857 WITH_THR(PL_curcop = &PL_compiling);
54310121 858 break;
748a9306 859 case OP_SCOPE:
79072805 860 case OP_LINESEQ:
8990e307 861 case OP_LIST:
11343788 862 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 863 if (kid->op_sibling)
864 scalarvoid(kid);
865 else
866 scalar(kid);
867 }
3280af22 868 WITH_THR(PL_curcop = &PL_compiling);
79072805
LW		 869 break;
870 }
11343788 871 return o;
79072805
LW		 872}
873
874OP *
8ac85365 875scalarvoid(OP *o)
79072805
LW		 876{
877 OP *kid;
8990e307
LW		 878 char* useless = 0;
879 SV* sv;
79072805 880
54310121 881 /* assumes no premature commitment */
68c73484
JH		 882 U8 want = o->op_flags & OPf_WANT;
883 if (!o || (want && want != OPf_WANT_SCALAR) || PL_error_count
5dc0d613 884 || o->op_type == OP_RETURN)
11343788 885 return o;
79072805 886
5dc0d613 887 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 888
11343788 889 switch (o->op_type) {
79072805 890 default:
22c35a8c 891 if (!(PL_opargs[o->op_type] & OA_FOLDCONST))
8990e307 892 break;
36477c24 893 /* FALL THROUGH */
894 case OP_REPEAT:
11343788 895 if (o->op_flags & OPf_STACKED)
8990e307 896 break;
5d82c453
GA		 897 goto func_ops;
898 case OP_SUBSTR:
899 if (o->op_private == 4)
900 break;
8990e307
LW		 901 /* FALL THROUGH */
902 case OP_GVSV:
903 case OP_WANTARRAY:
904 case OP_GV:
905 case OP_PADSV:
906 case OP_PADAV:
907 case OP_PADHV:
908 case OP_PADANY:
909 case OP_AV2ARYLEN:
8990e307 910 case OP_REF:
a0d0e21e
LW		 911 case OP_REFGEN:
912 case OP_SREFGEN:
8990e307
LW		 913 case OP_DEFINED:
914 case OP_HEX:
915 case OP_OCT:
916 case OP_LENGTH:
8990e307
LW		 917 case OP_VEC:
918 case OP_INDEX:
919 case OP_RINDEX:
920 case OP_SPRINTF:
921 case OP_AELEM:
922 case OP_AELEMFAST:
923 case OP_ASLICE:
8990e307
LW		 924 case OP_HELEM:
925 case OP_HSLICE:
926 case OP_UNPACK:
927 case OP_PACK:
8990e307
LW		 928 case OP_JOIN:
929 case OP_LSLICE:
930 case OP_ANONLIST:
931 case OP_ANONHASH:
932 case OP_SORT:
933 case OP_REVERSE:
934 case OP_RANGE:
935 case OP_FLIP:
936 case OP_FLOP:
937 case OP_CALLER:
938 case OP_FILENO:
939 case OP_EOF:
940 case OP_TELL:
941 case OP_GETSOCKNAME:
942 case OP_GETPEERNAME:
943 case OP_READLINK:
944 case OP_TELLDIR:
945 case OP_GETPPID:
946 case OP_GETPGRP:
947 case OP_GETPRIORITY:
948 case OP_TIME:
949 case OP_TMS:
950 case OP_LOCALTIME:
951 case OP_GMTIME:
952 case OP_GHBYNAME:
953 case OP_GHBYADDR:
954 case OP_GHOSTENT:
955 case OP_GNBYNAME:
956 case OP_GNBYADDR:
957 case OP_GNETENT:
958 case OP_GPBYNAME:
959 case OP_GPBYNUMBER:
960 case OP_GPROTOENT:
961 case OP_GSBYNAME:
962 case OP_GSBYPORT:
963 case OP_GSERVENT:
964 case OP_GPWNAM:
965 case OP_GPWUID:
966 case OP_GGRNAM:
967 case OP_GGRGID:
968 case OP_GETLOGIN:
5d82c453 969 func_ops:
11343788 970 if (!(o->op_private & OPpLVAL_INTRO))
22c35a8c 971 useless = PL_op_desc[o->op_type];
8990e307
LW		 972 break;
973
974 case OP_RV2GV:
975 case OP_RV2SV:
976 case OP_RV2AV:
977 case OP_RV2HV:
11343788
MB		 978 if (!(o->op_private & OPpLVAL_INTRO) &&
979 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 980 useless = "a variable";
981 break;
79072805 982
93a17b20 983 case OP_NEXTSTATE:
8990e307 984 case OP_DBSTATE:
3280af22 985 WITH_THR(PL_curcop = ((COP*)o)); /* for warning below */
93a17b20
LW		 986 break;
987
79072805 988 case OP_CONST:
11343788 989 sv = cSVOPo->op_sv;
d008e5eb
GS		 990 {
991 dTHR;
992 if (ckWARN(WARN_VOID)) {
993 useless = "a constant";
994 if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
995 useless = 0;
996 else if (SvPOK(sv)) {
997 if (strnEQ(SvPVX(sv), "di", 2) ||
998 strnEQ(SvPVX(sv), "ds", 2) ||
999 strnEQ(SvPVX(sv), "ig", 2))
1000 useless = 0;
1001 }
8990e307
LW		 1002 }
1003 }
11343788 1004 null(o); /* don't execute a constant */
8990e307 1005 SvREFCNT_dec(sv); /* don't even remember it */
79072805
LW		 1006 break;
1007
1008 case OP_POSTINC:
11343788 1009 o->op_type = OP_PREINC; /* pre-increment is faster */
22c35a8c 1010 o->op_ppaddr = PL_ppaddr[OP_PREINC];
79072805
LW		 1011 break;
1012
1013 case OP_POSTDEC:
11343788 1014 o->op_type = OP_PREDEC; /* pre-decrement is faster */
22c35a8c 1015 o->op_ppaddr = PL_ppaddr[OP_PREDEC];
79072805
LW		 1016 break;
1017
79072805
LW		 1018 case OP_OR:
1019 case OP_AND:
1020 case OP_COND_EXPR:
11343788 1021 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1022 scalarvoid(kid);
1023 break;
5aabfad6 1024
a0d0e21e 1025 case OP_NULL:
11343788 1026 if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
3280af22 1027 WITH_THR(PL_curcop = ((COP*)o)); /* for warning below */
11343788 1028 if (o->op_flags & OPf_STACKED)
a0d0e21e 1029 break;
5aabfad6 1030 /* FALL THROUGH */
79072805
LW		 1031 case OP_ENTERTRY:
1032 case OP_ENTER:
1033 case OP_SCALAR:
11343788 1034 if (!(o->op_flags & OPf_KIDS))
79072805 1035 break;
54310121 1036 /* FALL THROUGH */
463ee0b2 1037 case OP_SCOPE:
79072805
LW		 1038 case OP_LEAVE:
1039 case OP_LEAVETRY:
a0d0e21e 1040 case OP_LEAVELOOP:
79072805 1041 case OP_LINESEQ:
79072805 1042 case OP_LIST:
11343788 1043 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 1044 scalarvoid(kid);
1045 break;
c90c0ff4 1046 case OP_ENTEREVAL:
5196be3e 1047 scalarkids(o);
c90c0ff4 1048 break;
5aabfad6 1049 case OP_REQUIRE:
c90c0ff4 1050 /* all requires must return a boolean value */
5196be3e
MB		 1051 o->op_flags &= ~OPf_WANT;
1052 return scalar(o);
a0d0e21e 1053 case OP_SPLIT:
11343788 1054 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e
LW		 1055 if (!kPMOP->op_pmreplroot)
1056 deprecate("implicit split to @_");
1057 }
1058 break;
79072805 1059 }
d008e5eb
GS		 1060 if (useless) {
1061 dTHR;
1062 if (ckWARN(WARN_VOID))
1063 warner(WARN_VOID, "Useless use of %s in void context", useless);
1064 }
11343788 1065 return o;
79072805
LW		 1066}
1067
1068OP *
8ac85365 1069listkids(OP *o)
79072805
LW		 1070{
1071 OP *kid;
11343788
MB		 1072 if (o && o->op_flags & OPf_KIDS) {
1073 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 1074 list(kid);
1075 }
11343788 1076 return o;
79072805
LW		 1077}
1078
1079OP *
8ac85365 1080list(OP *o)
79072805
LW		 1081{
1082 OP *kid;
1083
a0d0e21e 1084 /* assumes no premature commitment */
3280af22 1085 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 1086 || o->op_type == OP_RETURN)
11343788 1087 return o;
79072805 1088
5dc0d613 1089 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 1090
11343788 1091 switch (o->op_type) {
79072805
LW		 1092 case OP_FLOP:
1093 case OP_REPEAT:
11343788 1094 list(cBINOPo->op_first);
79072805
LW		 1095 break;
1096 case OP_OR:
1097 case OP_AND:
1098 case OP_COND_EXPR:
11343788 1099 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 1100 list(kid);
1101 break;
1102 default:
1103 case OP_MATCH:
8782bef2 1104 case OP_QR:
79072805
LW		 1105 case OP_SUBST:
1106 case OP_NULL:
11343788 1107 if (!(o->op_flags & OPf_KIDS))
79072805 1108 break;
11343788
MB		 1109 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
1110 list(cBINOPo->op_first);
1111 return gen_constant_list(o);
79072805
LW		 1112 }
1113 case OP_LIST:
11343788 1114 listkids(o);
79072805
LW		 1115 break;
1116 case OP_LEAVE:
1117 case OP_LEAVETRY:
5dc0d613 1118 kid = cLISTOPo->op_first;
54310121 1119 list(kid);
1120 while (kid = kid->op_sibling) {
1121 if (kid->op_sibling)
1122 scalarvoid(kid);
1123 else
1124 list(kid);
1125 }
3280af22 1126 WITH_THR(PL_curcop = &PL_compiling);
54310121 1127 break;
748a9306 1128 case OP_SCOPE:
79072805 1129 case OP_LINESEQ:
11343788 1130 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 1131 if (kid->op_sibling)
1132 scalarvoid(kid);
1133 else
1134 list(kid);
1135 }
3280af22 1136 WITH_THR(PL_curcop = &PL_compiling);
79072805 1137 break;
c90c0ff4 1138 case OP_REQUIRE:
1139 /* all requires must return a boolean value */
5196be3e
MB		 1140 o->op_flags &= ~OPf_WANT;
1141 return scalar(o);
79072805 1142 }
11343788 1143 return o;
79072805
LW		 1144}
1145
1146OP *
8ac85365 1147scalarseq(OP *o)
79072805
LW		 1148{
1149 OP *kid;
1150
11343788
MB		 1151 if (o) {
1152 if (o->op_type == OP_LINESEQ ||
1153 o->op_type == OP_SCOPE ||
1154 o->op_type == OP_LEAVE ||
1155 o->op_type == OP_LEAVETRY)
463ee0b2 1156 {
0f15f207 1157 dTHR;
11343788 1158 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1159 if (kid->op_sibling) {
463ee0b2 1160 scalarvoid(kid);
ed6116ce 1161 }
463ee0b2 1162 }
3280af22 1163 PL_curcop = &PL_compiling;
79072805 1164 }
11343788 1165 o->op_flags &= ~OPf_PARENS;
3280af22 1166 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 1167 o->op_flags |= OPf_PARENS;
79072805 1168 }
8990e307 1169 else
11343788
MB		 1170 o = newOP(OP_STUB, 0);
1171 return o;
79072805
LW		 1172}
1173
76e3520e 1174STATIC OP *
8ac85365 1175modkids(OP *o, I32 type)
79072805
LW		 1176{
1177 OP *kid;
11343788
MB		 1178 if (o && o->op_flags & OPf_KIDS) {
1179 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1180 mod(kid, type);
79072805 1181 }
11343788 1182 return o;
79072805
LW		 1183}
1184
79072805 1185OP *
8ac85365 1186mod(OP *o, I32 type)
79072805 1187{
11343788 1188 dTHR;
79072805
LW		 1189 OP *kid;
1190 SV *sv;
2d8e6c8d 1191 STRLEN n_a;
79072805 1192
3280af22 1193 if (!o || PL_error_count)
11343788 1194 return o;
79072805 1195
11343788 1196 switch (o->op_type) {
68dc0745 1197 case OP_UNDEF:
3280af22 1198 PL_modcount++;
5dc0d613 1199 return o;
a0d0e21e 1200 case OP_CONST:
11343788 1201 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e 1202 goto nomod;
3280af22
NIS		 1203 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
1204 PL_compiling.cop_arybase = (I32)SvIV(((SVOP*)PL_eval_start)->op_sv);
1205 PL_eval_start = 0;
a0d0e21e
LW		 1206 }
1207 else if (!type) {
3280af22
NIS		 1208 SAVEI32(PL_compiling.cop_arybase);
1209 PL_compiling.cop_arybase = 0;
a0d0e21e
LW		 1210 }
1211 else if (type == OP_REFGEN)
1212 goto nomod;
1213 else
1214 croak("That use of $[ is unsupported");
1215 break;
5f05dabc 1216 case OP_STUB:
5196be3e 1217 if (o->op_flags & OPf_PARENS)
5f05dabc 1218 break;
1219 goto nomod;
a0d0e21e
LW		 1220 case OP_ENTERSUB:
1221 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1222 !(o->op_flags & OPf_STACKED)) {
1223 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1224 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1225 assert(cUNOPo->op_first->op_type == OP_NULL);
1226 null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1227 break;
1228 }
1229 /* FALL THROUGH */
1230 default:
a0d0e21e
LW		 1231 nomod:
1232 /* grep, foreach, subcalls, refgen */
1233 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1234 break;
46fc3d4c 1235 yyerror(form("Can't modify %s in %s",
638bc118 1236 (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
22c35a8c
GS		 1237 ? "do block" : PL_op_desc[o->op_type]),
1238 type ? PL_op_desc[type] : "local"));
11343788 1239 return o;
79072805 1240
a0d0e21e
LW		 1241 case OP_PREINC:
1242 case OP_PREDEC:
1243 case OP_POW:
1244 case OP_MULTIPLY:
1245 case OP_DIVIDE:
1246 case OP_MODULO:
1247 case OP_REPEAT:
1248 case OP_ADD:
1249 case OP_SUBTRACT:
1250 case OP_CONCAT:
1251 case OP_LEFT_SHIFT:
1252 case OP_RIGHT_SHIFT:
1253 case OP_BIT_AND:
1254 case OP_BIT_XOR:
1255 case OP_BIT_OR:
1256 case OP_I_MULTIPLY:
1257 case OP_I_DIVIDE:
1258 case OP_I_MODULO:
1259 case OP_I_ADD:
1260 case OP_I_SUBTRACT:
11343788 1261 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1262 goto nomod;
3280af22 1263 PL_modcount++;
a0d0e21e
LW		 1264 break;
1265
79072805 1266 case OP_COND_EXPR:
11343788 1267 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1268 mod(kid, type);
79072805
LW		 1269 break;
1270
1271 case OP_RV2AV:
1272 case OP_RV2HV:
93af7a87 1273 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1274 croak("Can't localize through a reference");
11343788 1275 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
3280af22 1276 PL_modcount = 10000;
11343788 1277 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1278 }
1279 /* FALL THROUGH */
79072805 1280 case OP_RV2GV:
5dc0d613 1281 if (scalar_mod_type(o, type))
3fe9a6f1 1282 goto nomod;
11343788 1283 ref(cUNOPo->op_first, o->op_type);
79072805
LW		 1284 /* FALL THROUGH */
1285 case OP_AASSIGN:
1286 case OP_ASLICE:
1287 case OP_HSLICE:
93a17b20
LW		 1288 case OP_NEXTSTATE:
1289 case OP_DBSTATE:
a0d0e21e
LW		 1290 case OP_REFGEN:
1291 case OP_CHOMP:
3280af22 1292 PL_modcount = 10000;
79072805 1293 break;
463ee0b2 1294 case OP_RV2SV:
11343788 1295 if (!type && cUNOPo->op_first->op_type != OP_GV)
706a304b 1296 croak("Can't localize through a reference");
aeea060c 1297 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1298 /* FALL THROUGH */
79072805 1299 case OP_GV:
463ee0b2 1300 case OP_AV2ARYLEN:
3280af22 1301 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1302 case OP_SASSIGN:
bf4b1e52
GS		 1303 case OP_ANDASSIGN:
1304 case OP_ORASSIGN:
8990e307 1305 case OP_AELEMFAST:
3280af22 1306 PL_modcount++;
8990e307
LW		 1307 break;
1308
748a9306
LW		 1309 case OP_PADAV:
1310 case OP_PADHV:
3280af22 1311 PL_modcount = 10000;
5196be3e
MB		 1312 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1313 return o; /* Treat \(@foo) like ordinary list. */
1314 if (scalar_mod_type(o, type))
3fe9a6f1 1315 goto nomod;
748a9306
LW		 1316 /* FALL THROUGH */
1317 case OP_PADSV:
3280af22 1318 PL_modcount++;
748a9306
LW		 1319 if (!type)
1320 croak("Can't localize lexical variable %s",
2d8e6c8d 1321 SvPV(*av_fetch(PL_comppad_name, o->op_targ, 4), n_a));
463ee0b2
LW		 1322 break;
1323
554b3eca 1324#ifdef USE_THREADS
2faa37cc 1325 case OP_THREADSV:
533c011a 1326 PL_modcount++; /* XXX ??? */
554b3eca
MB		 1327 break;
1328#endif /* USE_THREADS */
1329
748a9306
LW		 1330 case OP_PUSHMARK:
1331 break;
a0d0e21e 1332
69969c6f
SB		 1333 case OP_KEYS:
1334 if (type != OP_SASSIGN)
1335 goto nomod;
5d82c453
GA		 1336 goto lvalue_func;
1337 case OP_SUBSTR:
1338 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1339 goto nomod;
5f05dabc 1340 /* FALL THROUGH */
a0d0e21e 1341 case OP_POS:
463ee0b2 1342 case OP_VEC:
5d82c453 1343 lvalue_func:
11343788
MB		 1344 pad_free(o->op_targ);
1345 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1346 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1347 if (o->op_flags & OPf_KIDS)
1348 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1349 break;
a0d0e21e 1350
463ee0b2
LW		 1351 case OP_AELEM:
1352 case OP_HELEM:
11343788 1353 ref(cBINOPo->op_first, o->op_type);
68dc0745 1354 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1355 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1356 o->op_private |= OPpLVAL_DEFER;
3280af22 1357 PL_modcount++;
463ee0b2
LW		 1358 break;
1359
1360 case OP_SCOPE:
1361 case OP_LEAVE:
1362 case OP_ENTER:
11343788
MB		 1363 if (o->op_flags & OPf_KIDS)
1364 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1365 break;
1366
1367 case OP_NULL:
638bc118
GS		 1368 if (o->op_flags & OPf_SPECIAL) /* do BLOCK */
1369 goto nomod;
1370 else if (!(o->op_flags & OPf_KIDS))
463ee0b2 1371 break;
11343788
MB		 1372 if (o->op_targ != OP_LIST) {
1373 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1374 break;
1375 }
1376 /* FALL THROUGH */
463ee0b2 1377 case OP_LIST:
11343788 1378 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1379 mod(kid, type);
1380 break;
1381 }
11343788 1382 o->op_flags |= OPf_MOD;
a0d0e21e
LW		 1383
1384 if (type == OP_AASSIGN || type == OP_SASSIGN)
11343788 1385 o->op_flags |= OPf_SPECIAL|OPf_REF;
a0d0e21e 1386 else if (!type) {
11343788
MB		 1387 o->op_private |= OPpLVAL_INTRO;
1388 o->op_flags &= ~OPf_SPECIAL;
3280af22 1389 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1390 }
a0d0e21e 1391 else if (type != OP_GREPSTART && type != OP_ENTERSUB)
11343788
MB		 1392 o->op_flags |= OPf_REF;
1393 return o;
463ee0b2
LW		 1394}
1395
3fe9a6f1 1396static bool
8ac85365 1397scalar_mod_type(OP *o, I32 type)
3fe9a6f1 1398{
1399 switch (type) {
1400 case OP_SASSIGN:
5196be3e 1401 if (o->op_type == OP_RV2GV)
3fe9a6f1 1402 return FALSE;
1403 /* FALL THROUGH */
1404 case OP_PREINC:
1405 case OP_PREDEC:
1406 case OP_POSTINC:
1407 case OP_POSTDEC:
1408 case OP_I_PREINC:
1409 case OP_I_PREDEC:
1410 case OP_I_POSTINC:
1411 case OP_I_POSTDEC:
1412 case OP_POW:
1413 case OP_MULTIPLY:
1414 case OP_DIVIDE:
1415 case OP_MODULO:
1416 case OP_REPEAT:
1417 case OP_ADD:
1418 case OP_SUBTRACT:
1419 case OP_I_MULTIPLY:
1420 case OP_I_DIVIDE:
1421 case OP_I_MODULO:
1422 case OP_I_ADD:
1423 case OP_I_SUBTRACT:
1424 case OP_LEFT_SHIFT:
1425 case OP_RIGHT_SHIFT:
1426 case OP_BIT_AND:
1427 case OP_BIT_XOR:
1428 case OP_BIT_OR:
1429 case OP_CONCAT:
1430 case OP_SUBST:
1431 case OP_TRANS:
49e9fbe6
GS		 1432 case OP_READ:
1433 case OP_SYSREAD:
1434 case OP_RECV:
bf4b1e52
GS		 1435 case OP_ANDASSIGN:
1436 case OP_ORASSIGN:
3fe9a6f1 1437 return TRUE;
1438 default:
1439 return FALSE;
1440 }
1441}
1442
35cd451c
GS		 1443STATIC bool
1444is_handle_constructor(OP *o, I32 argnum)
1445{
1446 switch (o->op_type) {
1447 case OP_PIPE_OP:
1448 case OP_SOCKPAIR:
1449 if (argnum == 2)
1450 return TRUE;
1451 /* FALL THROUGH */
1452 case OP_SYSOPEN:
1453 case OP_OPEN:
ded8aa31 1454 case OP_SELECT: /* XXX c.f. SelectSaver.pm */
35cd451c
GS		 1455 case OP_SOCKET:
1456 case OP_OPEN_DIR:
1457 case OP_ACCEPT:
1458 if (argnum == 1)
1459 return TRUE;
1460 /* FALL THROUGH */
1461 default:
1462 return FALSE;
1463 }
1464}
1465
463ee0b2 1466OP *
8ac85365 1467refkids(OP *o, I32 type)
463ee0b2
LW		 1468{
1469 OP *kid;
11343788
MB		 1470 if (o && o->op_flags & OPf_KIDS) {
1471 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1472 ref(kid, type);
1473 }
11343788 1474 return o;
463ee0b2
LW		 1475}
1476
1477OP *
8ac85365 1478ref(OP *o, I32 type)
463ee0b2
LW		 1479{
1480 OP *kid;
463ee0b2 1481
3280af22 1482 if (!o || PL_error_count)
11343788 1483 return o;
463ee0b2 1484
11343788 1485 switch (o->op_type) {
a0d0e21e 1486 case OP_ENTERSUB:
e55aaa0e 1487 if ((type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1488 !(o->op_flags & OPf_STACKED)) {
1489 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1490 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788
MB		 1491 assert(cUNOPo->op_first->op_type == OP_NULL);
1492 null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
1493 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1494 }
1495 break;
aeea060c 1496
463ee0b2 1497 case OP_COND_EXPR:
11343788 1498 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1499 ref(kid, type);
1500 break;
8990e307 1501 case OP_RV2SV:
35cd451c
GS		 1502 if (type == OP_DEFINED)
1503 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1504 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1505 /* FALL THROUGH */
1506 case OP_PADSV:
5f05dabc 1507 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1508 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1509 : type == OP_RV2HV ? OPpDEREF_HV
1510 : OPpDEREF_SV);
11343788 1511 o->op_flags |= OPf_MOD;
a0d0e21e 1512 }
8990e307
LW		 1513 break;
1514
2faa37cc 1515 case OP_THREADSV:
a863c7d1
MB		 1516 o->op_flags |= OPf_MOD; /* XXX ??? */
1517 break;
1518
463ee0b2
LW		 1519 case OP_RV2AV:
1520 case OP_RV2HV:
aeea060c 1521 o->op_flags |= OPf_REF;
8990e307 1522 /* FALL THROUGH */
463ee0b2 1523 case OP_RV2GV:
35cd451c
GS		 1524 if (type == OP_DEFINED)
1525 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1526 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1527 break;
8990e307 1528
463ee0b2
LW		 1529 case OP_PADAV:
1530 case OP_PADHV:
aeea060c 1531 o->op_flags |= OPf_REF;
79072805 1532 break;
aeea060c 1533
8990e307 1534 case OP_SCALAR:
79072805 1535 case OP_NULL:
11343788 1536 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1537 break;
11343788 1538 ref(cBINOPo->op_first, type);
79072805
LW		 1539 break;
1540 case OP_AELEM:
1541 case OP_HELEM:
11343788 1542 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1543 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1544 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1545 : type == OP_RV2HV ? OPpDEREF_HV
1546 : OPpDEREF_SV);
11343788 1547 o->op_flags |= OPf_MOD;
8990e307 1548 }
79072805
LW		 1549 break;
1550
463ee0b2 1551 case OP_SCOPE:
79072805
LW		 1552 case OP_LEAVE:
1553 case OP_ENTER:
8990e307 1554 case OP_LIST:
11343788 1555 if (!(o->op_flags & OPf_KIDS))
79072805 1556 break;
11343788 1557 ref(cLISTOPo->op_last, type);
79072805 1558 break;
a0d0e21e
LW		 1559 default:
1560 break;
79072805 1561 }
11343788 1562 return scalar(o);
8990e307 1563
79072805
LW		 1564}
1565
1566OP *
8ac85365 1567my(OP *o)
93a17b20
LW		 1568{
1569 OP *kid;
93a17b20
LW		 1570 I32 type;
1571
3280af22 1572 if (!o || PL_error_count)
11343788 1573 return o;
93a17b20 1574
11343788 1575 type = o->op_type;
93a17b20 1576 if (type == OP_LIST) {
11343788 1577 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
93a17b20 1578 my(kid);
dab48698 1579 } else if (type == OP_UNDEF) {
7766148a 1580 return o;
dab48698 1581 } else if (type != OP_PADSV &&
93a17b20
LW		 1582 type != OP_PADAV &&
1583 type != OP_PADHV &&
1584 type != OP_PUSHMARK)
1585 {
22c35a8c 1586 yyerror(form("Can't declare %s in my", PL_op_desc[o->op_type]));
11343788 1587 return o;
93a17b20 1588 }
11343788
MB		 1589 o->op_flags |= OPf_MOD;
1590 o->op_private |= OPpLVAL_INTRO;
1591 return o;
93a17b20
LW		 1592}
1593
1594OP *
8ac85365 1595sawparens(OP *o)
79072805
LW		 1596{
1597 if (o)
1598 o->op_flags |= OPf_PARENS;
1599 return o;
1600}
1601
1602OP *
8ac85365 1603bind_match(I32 type, OP *left, OP *right)
79072805 1604{
d008e5eb 1605 dTHR;
11343788 1606 OP *o;
79072805 1607
599cee73
PM		 1608 if (ckWARN(WARN_UNSAFE) &&
1609 (left->op_type == OP_RV2AV ||
1610 left->op_type == OP_RV2HV ||
1611 left->op_type == OP_PADAV ||
1612 left->op_type == OP_PADHV)) {
22c35a8c 1613 char *desc = PL_op_desc[(right->op_type == OP_SUBST ||
599cee73
PM		 1614 right->op_type == OP_TRANS)
1615 ? right->op_type : OP_MATCH];
1616 char *sample = ((left->op_type == OP_RV2AV ||
1617 left->op_type == OP_PADAV)
1618 ? "@array" : "%hash");
1619 warner(WARN_UNSAFE,
1620 "Applying %s to %s will act on scalar(%s)",
1621 desc, sample, sample);
2ae324a7 1622 }
1623
79072805
LW		 1624 if (right->op_type == OP_MATCH ||
1625 right->op_type == OP_SUBST ||
1626 right->op_type == OP_TRANS) {
1627 right->op_flags |= OPf_STACKED;
1628 if (right->op_type != OP_MATCH)
463ee0b2 1629 left = mod(left, right->op_type);
79072805 1630 if (right->op_type == OP_TRANS)
11343788 1631 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1632 else
11343788 1633 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1634 if (type == OP_NOT)
11343788
MB		 1635 return newUNOP(OP_NOT, 0, scalar(o));
1636 return o;
79072805
LW		 1637 }
1638 else
1639 return bind_match(type, left,
1640 pmruntime(newPMOP(OP_MATCH, 0), right, Nullop));
1641}
1642
1643OP *
8ac85365 1644invert(OP *o)
79072805 1645{
11343788
MB		 1646 if (!o)
1647 return o;
79072805 1648 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1649 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1650}
1651
1652OP *
8ac85365 1653scope(OP *o)
79072805
LW		 1654{
1655 if (o) {
3280af22 1656 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1657 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1658 o->op_type = OP_LEAVE;
22c35a8c 1659 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2
LW		 1660 }
1661 else {
1662 if (o->op_type == OP_LINESEQ) {
1663 OP *kid;
1664 o->op_type = OP_SCOPE;
22c35a8c 1665 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
463ee0b2 1666 kid = ((LISTOP*)o)->op_first;
748a9306
LW		 1667 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
1668 SvREFCNT_dec(((COP*)kid)->cop_filegv);
8990e307 1669 null(kid);
748a9306 1670 }
463ee0b2
LW		 1671 }
1672 else
748a9306 1673 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
463ee0b2 1674 }
79072805
LW		 1675 }
1676 return o;
1677}
1678
b3ac6de7
IZ		 1679void
1680save_hints(void)
1681{
3280af22
NIS		 1682 SAVEI32(PL_hints);
1683 SAVESPTR(GvHV(PL_hintgv));
1684 GvHV(PL_hintgv) = newHVhv(GvHV(PL_hintgv));
1685 SAVEFREESV(GvHV(PL_hintgv));
b3ac6de7
IZ		 1686}
1687
a0d0e21e 1688int
8ac85365 1689block_start(int full)
79072805 1690{
11343788 1691 dTHR;
3280af22 1692 int retval = PL_savestack_ix;
b3ac6de7 1693
3280af22 1694 SAVEI32(PL_comppad_name_floor);
55497cff 1695 if (full) {
3280af22
NIS		 1696 if ((PL_comppad_name_fill = AvFILLp(PL_comppad_name)) > 0)
1697 PL_comppad_name_floor = PL_comppad_name_fill;
55497cff 1698 else
3280af22
NIS		 1699 PL_comppad_name_floor = 0;
1700 }
1701 SAVEI32(PL_min_intro_pending);
1702 SAVEI32(PL_max_intro_pending);
1703 PL_min_intro_pending = 0;
1704 SAVEI32(PL_comppad_name_fill);
1705 SAVEI32(PL_padix_floor);
1706 PL_padix_floor = PL_padix;
1707 PL_pad_reset_pending = FALSE;
b3ac6de7 1708 SAVEHINTS();
3280af22 1709 PL_hints &= ~HINT_BLOCK_SCOPE;
e24b16f9 1710 SAVEPPTR(PL_compiling.cop_warnings);
599cee73
PM		 1711 if (PL_compiling.cop_warnings != WARN_ALL &&
1712 PL_compiling.cop_warnings != WARN_NONE) {
1713 PL_compiling.cop_warnings = newSVsv(PL_compiling.cop_warnings) ;
1714 SAVEFREESV(PL_compiling.cop_warnings) ;
1715 }
1716
1717
a0d0e21e
LW		 1718 return retval;
1719}
1720
1721OP*
8ac85365 1722block_end(I32 floor, OP *seq)
a0d0e21e 1723{
11343788 1724 dTHR;
3280af22 1725 int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
a0d0e21e 1726 OP* retval = scalarseq(seq);
a0d0e21e 1727 LEAVE_SCOPE(floor);
3280af22 1728 PL_pad_reset_pending = FALSE;
e24b16f9 1729 PL_compiling.op_private = PL_hints;
a0d0e21e 1730 if (needblockscope)
3280af22
NIS		 1731 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
1732 pad_leavemy(PL_comppad_name_fill);
1733 PL_cop_seqmax++;
a0d0e21e
LW		 1734 return retval;
1735}
1736
76e3520e 1737STATIC OP *
54b9620d
MB		 1738newDEFSVOP(void)
1739{
1740#ifdef USE_THREADS
1741 OP *o = newOP(OP_THREADSV, 0);
1742 o->op_targ = find_threadsv("_");
1743 return o;
1744#else
3280af22 1745 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
54b9620d
MB		 1746#endif /* USE_THREADS */
1747}
1748
a0d0e21e 1749void
8ac85365 1750newPROG(OP *o)
a0d0e21e 1751{
11343788 1752 dTHR;
3280af22 1753 if (PL_in_eval) {
b295d113
TH		 1754 if (PL_eval_root)
1755 return;
3280af22
NIS		 1756 PL_eval_root = newUNOP(OP_LEAVEEVAL, ((PL_in_eval & 4) ? OPf_SPECIAL : 0), o);
1757 PL_eval_start = linklist(PL_eval_root);
1758 PL_eval_root->op_next = 0;
1759 peep(PL_eval_start);
a0d0e21e
LW		 1760 }
1761 else {
5dc0d613 1762 if (!o)
a0d0e21e 1763 return;
3280af22
NIS		 1764 PL_main_root = scope(sawparens(scalarvoid(o)));
1765 PL_curcop = &PL_compiling;
1766 PL_main_start = LINKLIST(PL_main_root);
1767 PL_main_root->op_next = 0;
1768 peep(PL_main_start);
1769 PL_compcv = 0;
3841441e 1770
4fdae800 1771 /* Register with debugger */
84902520 1772 if (PERLDB_INTER) {
3841441e 1773 CV *cv = perl_get_cv("DB::postponed", FALSE);
3841441e
CS		 1774 if (cv) {
1775 dSP;
924508f0 1776 PUSHMARK(SP);
3280af22 1777 XPUSHs((SV*)PL_compiling.cop_filegv);
3841441e
CS		 1778 PUTBACK;
1779 perl_call_sv((SV*)cv, G_DISCARD);
1780 }
1781 }
79072805 1782 }
79072805
LW		 1783}
1784
1785OP *
8ac85365 1786localize(OP *o, I32 lex)
79072805
LW		 1787{
1788 if (o->op_flags & OPf_PARENS)
1789 list(o);
8990e307 1790 else {
d008e5eb 1791 dTHR;
599cee73 1792 if (ckWARN(WARN_PARENTHESIS) && PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ',') {
8990e307 1793 char *s;
834a4ddd 1794 for (s = PL_bufptr; *s && (isALNUM(*s) || (*s & 0x80) || strchr("@$%, ",*s)); s++) ;
a0d0e21e 1795 if (*s == ';' || *s == '=')
752ebe84 1796 warner(WARN_PARENTHESIS, "Parentheses missing around \"%s\" list",
599cee73 1797 lex ? "my" : "local");
8990e307
LW		 1798 }
1799 }
3280af22
NIS		 1800 PL_in_my = FALSE;
1801 PL_in_my_stash = Nullhv;
93a17b20
LW		 1802 if (lex)
1803 return my(o);
1804 else
463ee0b2 1805 return mod(o, OP_NULL); /* a bit kludgey */
79072805
LW		 1806}
1807
1808OP *
8ac85365 1809jmaybe(OP *o)
79072805
LW		 1810{
1811 if (o->op_type == OP_LIST) {
554b3eca
MB		 1812 OP *o2;
1813#ifdef USE_THREADS
2faa37cc 1814 o2 = newOP(OP_THREADSV, 0);
54b9620d 1815 o2->op_targ = find_threadsv(";");
554b3eca
MB		 1816#else
1817 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
1818#endif /* USE_THREADS */
1819 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 1820 }
1821 return o;
1822}
1823
1824OP *
8ac85365 1825fold_constants(register OP *o)
79072805 1826{
11343788 1827 dTHR;
79072805
LW		 1828 register OP *curop;
1829 I32 type = o->op_type;
748a9306 1830 SV *sv;
79072805 1831
22c35a8c 1832 if (PL_opargs[type] & OA_RETSCALAR)
79072805 1833 scalar(o);
22c35a8c 1834 if (PL_opargs[type] & OA_TARGET)
ed6116ce 1835 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 1836
22c35a8c
GS		 1837 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER))
1838 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
85e6fe83 1839
22c35a8c 1840 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 1841 goto nope;
1842
de939608
CS		 1843 switch (type) {
1844 case OP_SPRINTF:
1845 case OP_UCFIRST:
1846 case OP_LCFIRST:
1847 case OP_UC:
1848 case OP_LC:
69dcf70c
MB		 1849 case OP_SLT:
1850 case OP_SGT:
1851 case OP_SLE:
1852 case OP_SGE:
1853 case OP_SCMP:
1854
de939608
CS		 1855 if (o->op_private & OPpLOCALE)
1856 goto nope;
1857 }
1858
3280af22 1859 if (PL_error_count)
a0d0e21e
LW		 1860 goto nope; /* Don't try to run w/ errors */
1861
79072805 1862 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
93a17b20
LW		 1863 if (curop->op_type != OP_CONST &&
1864 curop->op_type != OP_LIST &&
1865 curop->op_type != OP_SCALAR &&
a0d0e21e 1866 curop->op_type != OP_NULL &&
93a17b20 1867 curop->op_type != OP_PUSHMARK) {
79072805
LW		 1868 goto nope;
1869 }
1870 }
1871
1872 curop = LINKLIST(o);
1873 o->op_next = 0;
533c011a 1874 PL_op = curop;
76e3520e 1875 CALLRUNOPS();
3280af22 1876 sv = *(PL_stack_sp--);
748a9306 1877 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
79072805 1878 pad_swipe(o->op_targ);
748a9306
LW		 1879 else if (SvTEMP(sv)) { /* grab mortal temp? */
1880 (void)SvREFCNT_inc(sv);
1881 SvTEMP_off(sv);
85e6fe83 1882 }
79072805
LW		 1883 op_free(o);
1884 if (type == OP_RV2GV)
b1cb66bf 1885 return newGVOP(OP_GV, 0, (GV*)sv);
748a9306 1886 else {
ee580363
GS		 1887 /* try to smush double to int, but don't smush -2.0 to -2 */
1888 if ((SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK)) == SVf_NOK &&
1889 type != OP_NEGATE)
1890 {
748a9306 1891 IV iv = SvIV(sv);
ee580363 1892 if ((double)iv == SvNV(sv)) {
748a9306
LW		 1893 SvREFCNT_dec(sv);
1894 sv = newSViv(iv);
1895 }
b1cb66bf 1896 else
1897 SvIOK_off(sv); /* undo SvIV() damage */
748a9306
LW		 1898 }
1899 return newSVOP(OP_CONST, 0, sv);
1900 }
aeea060c 1901
79072805 1902 nope:
22c35a8c 1903 if (!(PL_opargs[type] & OA_OTHERINT))
79072805 1904 return o;
79072805 1905
3280af22 1906 if (!(PL_hints & HINT_INTEGER)) {
a0d0e21e 1907 if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
85e6fe83
LW		 1908 return o;
1909
1910 for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
1911 if (curop->op_type == OP_CONST) {
b1cb66bf 1912 if (SvIOK(((SVOP*)curop)->op_sv))
85e6fe83
LW		 1913 continue;
1914 return o;
1915 }
22c35a8c 1916 if (PL_opargs[curop->op_type] & OA_RETINTEGER)
79072805
LW		 1917 continue;
1918 return o;
1919 }
22c35a8c 1920 o->op_ppaddr = PL_ppaddr[++(o->op_type)];
79072805
LW		 1921 }
1922
79072805
LW		 1923 return o;
1924}
1925
1926OP *
8ac85365 1927gen_constant_list(register OP *o)
79072805 1928{
11343788 1929 dTHR;
79072805 1930 register OP *curop;
3280af22 1931 I32 oldtmps_floor = PL_tmps_floor;
79072805 1932
a0d0e21e 1933 list(o);
3280af22 1934 if (PL_error_count)
a0d0e21e
LW		 1935 return o; /* Don't attempt to run with errors */
1936
533c011a 1937 PL_op = curop = LINKLIST(o);
a0d0e21e 1938 o->op_next = 0;
11343788 1939 pp_pushmark(ARGS);
76e3520e 1940 CALLRUNOPS();
533c011a 1941 PL_op = curop;
11343788 1942 pp_anonlist(ARGS);
3280af22 1943 PL_tmps_floor = oldtmps_floor;
79072805
LW		 1944
1945 o->op_type = OP_RV2AV;
22c35a8c 1946 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 1947 curop = ((UNOP*)o)->op_first;
3280af22 1948 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*PL_stack_sp--));
79072805 1949 op_free(curop);
79072805
LW		 1950 linklist(o);
1951 return list(o);
1952}
1953
1954OP *
8ac85365 1955convert(I32 type, I32 flags, OP *o)
79072805
LW		 1956{
1957 OP *kid;
a0d0e21e 1958 OP *last = 0;
79072805 1959
11343788
MB		 1960 if (!o || o->op_type != OP_LIST)
1961 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 1962 else
5dc0d613 1963 o->op_flags &= ~OPf_WANT;
79072805 1964
22c35a8c 1965 if (!(PL_opargs[type] & OA_MARK))
11343788 1966 null(cLISTOPo->op_first);
8990e307 1967
11343788 1968 o->op_type = type;
22c35a8c 1969 o->op_ppaddr = PL_ppaddr[type];
11343788 1970 o->op_flags |= flags;
79072805 1971
11343788
MB		 1972 o = CHECKOP(type, o);
1973 if (o->op_type != type)
1974 return o;
79072805 1975
11343788 1976 if (cLISTOPo->op_children < 7) {
79072805 1977 /* XXX do we really need to do this if we're done appending?? */
11343788 1978 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805 1979 last = kid;
11343788 1980 cLISTOPo->op_last = last; /* in case check substituted last arg */
79072805
LW		 1981 }
1982
11343788 1983 return fold_constants(o);
79072805
LW		 1984}
1985
1986/* List constructors */
1987
1988OP *
8ac85365 1989append_elem(I32 type, OP *first, OP *last)
79072805
LW		 1990{
1991 if (!first)
1992 return last;
8990e307
LW		 1993
1994 if (!last)
79072805 1995 return first;
8990e307 1996
a0d0e21e
LW		 1997 if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
1998 return newLISTOP(type, 0, first, last);
79072805 1999
a0d0e21e
LW		 2000 if (first->op_flags & OPf_KIDS)
2001 ((LISTOP*)first)->op_last->op_sibling = last;
2002 else {
2003 first->op_flags |= OPf_KIDS;
2004 ((LISTOP*)first)->op_first = last;
2005 }
2006 ((LISTOP*)first)->op_last = last;
2007 ((LISTOP*)first)->op_children++;
2008 return first;
79072805
LW		 2009}
2010
2011OP *
8ac85365 2012append_list(I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2013{
2014 if (!first)
2015 return (OP*)last;
8990e307
LW		 2016
2017 if (!last)
79072805 2018 return (OP*)first;
8990e307
LW		 2019
2020 if (first->op_type != type)
79072805 2021 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307
LW		 2022
2023 if (last->op_type != type)
79072805
LW		 2024 return append_elem(type, (OP*)first, (OP*)last);
2025
2026 first->op_last->op_sibling = last->op_first;
2027 first->op_last = last->op_last;
2028 first->op_children += last->op_children;
2029 if (first->op_children)
acb74605 2030 first->op_flags |= OPf_KIDS;
b7dc083c
NIS		 2031
2032#ifdef PL_OP_SLAB_ALLOC
2033#else
2034 Safefree(last);
2035#endif
79072805
LW		 2036 return (OP*)first;
2037}
2038
2039OP *
8ac85365 2040prepend_elem(I32 type, OP *first, OP *last)
79072805
LW		 2041{
2042 if (!first)
2043 return last;
8990e307
LW		 2044
2045 if (!last)
79072805 2046 return first;
8990e307
LW		 2047
2048 if (last->op_type == type) {
2049 if (type == OP_LIST) { /* already a PUSHMARK there */
2050 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2051 ((LISTOP*)last)->op_first->op_sibling = first;
2052 }
2053 else {
2054 if (!(last->op_flags & OPf_KIDS)) {
2055 ((LISTOP*)last)->op_last = first;
2056 last->op_flags |= OPf_KIDS;
2057 }
2058 first->op_sibling = ((LISTOP*)last)->op_first;
2059 ((LISTOP*)last)->op_first = first;
79072805 2060 }
79072805
LW		 2061 ((LISTOP*)last)->op_children++;
2062 return last;
2063 }
2064
2065 return newLISTOP(type, 0, first, last);
2066}
2067
2068/* Constructors */
2069
2070OP *
8ac85365 2071newNULLLIST(void)
79072805 2072{
8990e307
LW		 2073 return newOP(OP_STUB, 0);
2074}
2075
2076OP *
8ac85365 2077force_list(OP *o)
8990e307 2078{
11343788
MB		 2079 if (!o || o->op_type != OP_LIST)
2080 o = newLISTOP(OP_LIST, 0, o, Nullop);
2081 null(o);
2082 return o;
79072805
LW		 2083}
2084
2085OP *
8ac85365 2086newLISTOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2087{
2088 LISTOP *listop;
2089
b7dc083c 2090 NewOp(1101, listop, 1, LISTOP);
79072805
LW		 2091
2092 listop->op_type = type;
22c35a8c 2093 listop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2094 listop->op_children = (first != 0) + (last != 0);
2095 listop->op_flags = flags;
79072805
LW		 2096
2097 if (!last && first)
2098 last = first;
2099 else if (!first && last)
2100 first = last;
8990e307
LW		 2101 else if (first)
2102 first->op_sibling = last;
79072805
LW		 2103 listop->op_first = first;
2104 listop->op_last = last;
8990e307
LW		 2105 if (type == OP_LIST) {
2106 OP* pushop;
2107 pushop = newOP(OP_PUSHMARK, 0);
2108 pushop->op_sibling = first;
2109 listop->op_first = pushop;
2110 listop->op_flags |= OPf_KIDS;
2111 if (!last)
2112 listop->op_last = pushop;
2113 }
2114 else if (listop->op_children)
2115 listop->op_flags |= OPf_KIDS;
79072805
LW		 2116
2117 return (OP*)listop;
2118}
2119
2120OP *
8ac85365 2121newOP(I32 type, I32 flags)
79072805 2122{
11343788 2123 OP *o;
b7dc083c 2124 NewOp(1101, o, 1, OP);
11343788 2125 o->op_type = type;
22c35a8c 2126 o->op_ppaddr = PL_ppaddr[type];
11343788 2127 o->op_flags = flags;
79072805 2128
11343788
MB		 2129 o->op_next = o;
2130 o->op_private = 0 + (flags >> 8);
22c35a8c 2131 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2132 scalar(o);
22c35a8c 2133 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2134 o->op_targ = pad_alloc(type, SVs_PADTMP);
2135 return CHECKOP(type, o);
79072805
LW		 2136}
2137
2138OP *
8ac85365 2139newUNOP(I32 type, I32 flags, OP *first)
79072805
LW		 2140{
2141 UNOP *unop;
2142
93a17b20 2143 if (!first)
aeea060c 2144 first = newOP(OP_STUB, 0);
22c35a8c 2145 if (PL_opargs[type] & OA_MARK)
8990e307 2146 first = force_list(first);
93a17b20 2147
b7dc083c 2148 NewOp(1101, unop, 1, UNOP);
79072805 2149 unop->op_type = type;
22c35a8c 2150 unop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2151 unop->op_first = first;
2152 unop->op_flags = flags | OPf_KIDS;
c07a80fd 2153 unop->op_private = 1 | (flags >> 8);
e50aee73 2154 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2155 if (unop->op_next)
2156 return (OP*)unop;
2157
a0d0e21e 2158 return fold_constants((OP *) unop);
79072805
LW		 2159}
2160
2161OP *
8ac85365 2162newBINOP(I32 type, I32 flags, OP *first, OP *last)
79072805
LW		 2163{
2164 BINOP *binop;
b7dc083c 2165 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2166
2167 if (!first)
2168 first = newOP(OP_NULL, 0);
2169
2170 binop->op_type = type;
22c35a8c 2171 binop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2172 binop->op_first = first;
2173 binop->op_flags = flags | OPf_KIDS;
2174 if (!last) {
2175 last = first;
c07a80fd 2176 binop->op_private = 1 | (flags >> 8);
79072805
LW		 2177 }
2178 else {
c07a80fd 2179 binop->op_private = 2 | (flags >> 8);
79072805
LW		 2180 first->op_sibling = last;
2181 }
2182
e50aee73 2183 binop = (BINOP*)CHECKOP(type, binop);
79072805
LW		 2184 if (binop->op_next)
2185 return (OP*)binop;
2186
7284ab6f 2187 binop->op_last = binop->op_first->op_sibling;
79072805 2188
a0d0e21e 2189 return fold_constants((OP *)binop);
79072805
LW		 2190}
2191
a0ed51b3
LW		 2192static int
2193utf8compare(const void *a, const void *b)
2194{
2195 int i;
2196 for (i = 0; i < 10; i++) {
2197 if ((*(U8**)a)[i] < (*(U8**)b)[i])
2198 return -1;
2199 if ((*(U8**)a)[i] > (*(U8**)b)[i])
2200 return 1;
2201 }
2202 return 0;
2203}
2204
79072805 2205OP *
8ac85365 2206pmtrans(OP *o, OP *expr, OP *repl)
79072805 2207{
79072805
LW		 2208 SV *tstr = ((SVOP*)expr)->op_sv;
2209 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2210 STRLEN tlen;
2211 STRLEN rlen;
ec49126f 2212 register U8 *t = (U8*)SvPV(tstr, tlen);
2213 register U8 *r = (U8*)SvPV(rstr, rlen);
79072805
LW		 2214 register I32 i;
2215 register I32 j;
a0ed51b3 2216 I32 del;
79072805 2217 I32 complement;
5d06d08e 2218 I32 squash;
79072805
LW		 2219 register short *tbl;
2220
11343788 2221 complement = o->op_private & OPpTRANS_COMPLEMENT;
a0ed51b3 2222 del = o->op_private & OPpTRANS_DELETE;
5d06d08e 2223 squash = o->op_private & OPpTRANS_SQUASH;
79072805 2224
a0ed51b3 2225 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
79cb57f6 2226 SV* listsv = newSVpvn("# comment\n",10);
a0ed51b3
LW		 2227 SV* transv = 0;
2228 U8* tend = t + tlen;
2229 U8* rend = r + rlen;
2230 I32 ulen;
2231 U32 tfirst = 1;
2232 U32 tlast = 0;
2233 I32 tdiff;
2234 U32 rfirst = 1;
2235 U32 rlast = 0;
2236 I32 rdiff;
2237 I32 diff;
2238 I32 none = 0;
2239 U32 max = 0;
2240 I32 bits;
2241 I32 grows = 0;
2242 I32 havefinal = 0;
2243 U32 final;
2244 HV *hv;
2245 I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2246 I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
2247
2248 if (complement) {
2249 U8 tmpbuf[10];
2250 U8** cp;
2251 UV nextmin = 0;
2252 New(1109, cp, tlen, U8*);
2253 i = 0;
79cb57f6 2254 transv = newSVpvn("",0);
a0ed51b3
LW		 2255 while (t < tend) {
2256 cp[i++] = t;
2257 t += UTF8SKIP(t);
2258 if (*t == 0xff) {
2259 t++;
2260 t += UTF8SKIP(t);
2261 }
2262 }
2263 qsort(cp, i, sizeof(U8*), utf8compare);
2264 for (j = 0; j < i; j++) {
2265 U8 *s = cp[j];
2266 UV val = utf8_to_uv(s, &ulen);
2267 s += ulen;
2268 diff = val - nextmin;
2269 if (diff > 0) {
2270 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2271 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2272 if (diff > 1) {
2273 t = uv_to_utf8(tmpbuf, val - 1);
2274 sv_catpvn(transv, "\377", 1);
dfe13c55 2275 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2276 }
2277 }
2278 if (*s == 0xff)
2279 val = utf8_to_uv(s+1, &ulen);
2280 if (val >= nextmin)
2281 nextmin = val + 1;
2282 }
2283 t = uv_to_utf8(tmpbuf,nextmin);
dfe13c55 2284 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2285 t = uv_to_utf8(tmpbuf, 0x7fffffff);
2286 sv_catpvn(transv, "\377", 1);
dfe13c55
GS		 2287 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2288 t = (U8*)SvPVX(transv);
a0ed51b3
LW		 2289 tlen = SvCUR(transv);
2290 tend = t + tlen;
2291 }
2292 else if (!rlen && !del) {
2293 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2294 }
2295 if (!squash) {
2296 if (to_utf && from_utf) { /* only counting characters */
2297 if (t == r || (tlen == rlen && memEQ(t, r, tlen)))
2298 o->op_private |= OPpTRANS_IDENTICAL;
2299 }
2300 else { /* straight latin-1 translation */
2301 if (tlen == 4 && memEQ(t, "\0\377\303\277", 4) &&
2302 rlen == 4 && memEQ(r, "\0\377\303\277", 4))
2303 o->op_private |= OPpTRANS_IDENTICAL;
2304 }
a0ed51b3
LW		 2305 }
2306
2307 while (t < tend || tfirst <= tlast) {
2308 /* see if we need more "t" chars */
2309 if (tfirst > tlast) {
2310 tfirst = (I32)utf8_to_uv(t, &ulen);
2311 t += ulen;
2312 if (t < tend && *t == 0xff) { /* illegal utf8 val indicates range */
2313 tlast = (I32)utf8_to_uv(++t, &ulen);
2314 t += ulen;
2315 }
2316 else
2317 tlast = tfirst;
2318 }
2319
2320 /* now see if we need more "r" chars */
2321 if (rfirst > rlast) {
2322 if (r < rend) {
2323 rfirst = (I32)utf8_to_uv(r, &ulen);
2324 r += ulen;
2325 if (r < rend && *r == 0xff) { /* illegal utf8 val indicates range */
2326 rlast = (I32)utf8_to_uv(++r, &ulen);
2327 r += ulen;
2328 }
2329 else
2330 rlast = rfirst;
2331 }
2332 else {
2333 if (!havefinal++)
2334 final = rlast;
2335 rfirst = rlast = 0xffffffff;
2336 }
2337 }
2338
2339 /* now see which range will peter our first, if either. */
2340 tdiff = tlast - tfirst;
2341 rdiff = rlast - rfirst;
2342
2343 if (tdiff <= rdiff)
2344 diff = tdiff;
2345 else
2346 diff = rdiff;
2347
2348 if (rfirst == 0xffffffff) {
2349 diff = tdiff; /* oops, pretend rdiff is infinite */
2350 if (diff > 0)
2351 sv_catpvf(listsv, "%04x\t%04x\tXXXX\n", tfirst, tlast);
2352 else
2353 sv_catpvf(listsv, "%04x\t\tXXXX\n", tfirst);
2354 }
2355 else {
2356 if (diff > 0)
2357 sv_catpvf(listsv, "%04x\t%04x\t%04x\n", tfirst, tfirst + diff, rfirst);
2358 else
2359 sv_catpvf(listsv, "%04x\t\t%04x\n", tfirst, rfirst);
2360
2361 if (rfirst + diff > max)
2362 max = rfirst + diff;
2363 rfirst += diff + 1;
2364 if (!grows) {
2365 if (rfirst <= 0x80)
2366 ;
2367 else if (rfirst <= 0x800)
2368 grows |= (tfirst < 0x80);
2369 else if (rfirst <= 0x10000)
2370 grows |= (tfirst < 0x800);
2371 else if (rfirst <= 0x200000)
2372 grows |= (tfirst < 0x10000);
2373 else if (rfirst <= 0x4000000)
2374 grows |= (tfirst < 0x200000);
2375 else if (rfirst <= 0x80000000)
2376 grows |= (tfirst < 0x4000000);
2377 }
2378 }
2379 tfirst += diff + 1;
2380 }
2381
2382 none = ++max;
2383 if (del)
2384 del = ++max;
2385
2386 if (max > 0xffff)
2387 bits = 32;
2388 else if (max > 0xff)
2389 bits = 16;
2390 else
2391 bits = 8;
2392
2393 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2394 SvREFCNT_dec(listsv);
2395 if (transv)
2396 SvREFCNT_dec(transv);
2397
2398 if (!del && havefinal)
2399 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5, newSViv((IV)final), 0);
2400
2401 if (grows && to_utf)
2402 o->op_private |= OPpTRANS_GROWS;
2403
2404 op_free(expr);
2405 op_free(repl);
2406 return o;
2407 }
2408
2409 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 2410 if (complement) {
2411 Zero(tbl, 256, short);
2412 for (i = 0; i < tlen; i++)
ec49126f 2413 tbl[t[i]] = -1;
79072805
LW		 2414 for (i = 0, j = 0; i < 256; i++) {
2415 if (!tbl[i]) {
2416 if (j >= rlen) {
a0ed51b3 2417 if (del)
79072805
LW		 2418 tbl[i] = -2;
2419 else if (rlen)
ec49126f 2420 tbl[i] = r[j-1];
79072805
LW		 2421 else
2422 tbl[i] = i;
2423 }
2424 else
ec49126f 2425 tbl[i] = r[j++];
79072805
LW		 2426 }
2427 }
2428 }
2429 else {
a0ed51b3 2430 if (!rlen && !del) {
79072805 2431 r = t; rlen = tlen;
5d06d08e 2432 if (!squash)
4757a243 2433 o->op_private |= OPpTRANS_IDENTICAL;
79072805
LW		 2434 }
2435 for (i = 0; i < 256; i++)
2436 tbl[i] = -1;
2437 for (i = 0, j = 0; i < tlen; i++,j++) {
2438 if (j >= rlen) {
a0ed51b3 2439 if (del) {
ec49126f 2440 if (tbl[t[i]] == -1)
2441 tbl[t[i]] = -2;
79072805
LW		 2442 continue;
2443 }
2444 --j;
2445 }
ec49126f 2446 if (tbl[t[i]] == -1)
2447 tbl[t[i]] = r[j];
79072805
LW		 2448 }
2449 }
2450 op_free(expr);
2451 op_free(repl);
2452
11343788 2453 return o;
79072805
LW		 2454}
2455
2456OP *
8ac85365 2457newPMOP(I32 type, I32 flags)
79072805 2458{
11343788 2459 dTHR;
79072805
LW		 2460 PMOP *pmop;
2461
b7dc083c 2462 NewOp(1101, pmop, 1, PMOP);
79072805 2463 pmop->op_type = type;
22c35a8c 2464 pmop->op_ppaddr = PL_ppaddr[type];
79072805 2465 pmop->op_flags = flags;
c07a80fd 2466 pmop->op_private = 0 | (flags >> 8);
79072805 2467
3280af22 2468 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 2469 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 2470 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 2471 pmop->op_pmpermflags |= PMf_LOCALE;
2472 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2473
79072805 2474 /* link into pm list */
3280af22
NIS		 2475 if (type != OP_TRANS && PL_curstash) {
2476 pmop->op_pmnext = HvPMROOT(PL_curstash);
2477 HvPMROOT(PL_curstash) = pmop;
79072805
LW		 2478 }
2479
2480 return (OP*)pmop;
2481}
2482
2483OP *
8ac85365 2484pmruntime(OP *o, OP *expr, OP *repl)
79072805 2485{
5c0ca799 2486 dTHR;
79072805
LW		 2487 PMOP *pm;
2488 LOGOP *rcop;
ce862d02 2489 I32 repl_has_vars = 0;
79072805 2490
11343788
MB		 2491 if (o->op_type == OP_TRANS)
2492 return pmtrans(o, expr, repl);
79072805 2493
3280af22 2494 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2495 pm = (PMOP*)o;
79072805
LW		 2496
2497 if (expr->op_type == OP_CONST) {
463ee0b2 2498 STRLEN plen;
79072805 2499 SV *pat = ((SVOP*)expr)->op_sv;
463ee0b2 2500 char *p = SvPV(pat, plen);
11343788 2501 if ((o->op_flags & OPf_SPECIAL) && strEQ(p, " ")) {
93a17b20 2502 sv_setpvn(pat, "\\s+", 3);
463ee0b2 2503 p = SvPV(pat, plen);
79072805
LW		 2504 pm->op_pmflags |= PMf_SKIPWHITE;
2505 }
15e52e56 2506 pm->op_pmregexp = CALLREGCOMP(p, p + plen, pm);
aeea060c 2507 if (strEQ("\\s+", pm->op_pmregexp->precomp))
85e6fe83 2508 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2509 op_free(expr);
2510 }
2511 else {
3280af22
NIS		 2512 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
2513 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2514 ? OP_REGCRESET
2515 : OP_REGCMAYBE),0,expr);
463ee0b2 2516
b7dc083c 2517 NewOp(1101, rcop, 1, LOGOP);
79072805 2518 rcop->op_type = OP_REGCOMP;
22c35a8c 2519 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 2520 rcop->op_first = scalar(expr);
3280af22 2521 rcop->op_flags |= ((PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2522 ? (OPf_SPECIAL | OPf_KIDS)
2523 : OPf_KIDS);
79072805 2524 rcop->op_private = 1;
11343788 2525 rcop->op_other = o;
79072805
LW		 2526
2527 /* establish postfix order */
3280af22 2528 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2529 LINKLIST(expr);
2530 rcop->op_next = expr;
2531 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2532 }
2533 else {
2534 rcop->op_next = LINKLIST(expr);
2535 expr->op_next = (OP*)rcop;
2536 }
79072805 2537
11343788 2538 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2539 }
2540
2541 if (repl) {
748a9306 2542 OP *curop;
0244c3a4 2543 if (pm->op_pmflags & PMf_EVAL) {
748a9306 2544 curop = 0;
0244c3a4
GS		 2545 if (PL_curcop->cop_line < PL_multi_end)
2546 PL_curcop->cop_line = PL_multi_end;
2547 }
554b3eca 2548#ifdef USE_THREADS
2faa37cc 2549 else if (repl->op_type == OP_THREADSV
554b3eca 2550 && strchr("&`'123456789+",
533c011a 2551 PL_threadsv_names[repl->op_targ]))
554b3eca
MB		 2552 {
2553 curop = 0;
2554 }
2555#endif /* USE_THREADS */
748a9306
LW		 2556 else if (repl->op_type == OP_CONST)
2557 curop = repl;
79072805 2558 else {
79072805
LW		 2559 OP *lastop = 0;
2560 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 2561 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
554b3eca 2562#ifdef USE_THREADS
ce862d02
IZ		 2563 if (curop->op_type == OP_THREADSV) {
2564 repl_has_vars = 1;
be949f6f 2565 if (strchr("&`'123456789+", curop->op_private))
ce862d02 2566 break;
554b3eca
MB		 2567 }
2568#else
79072805
LW		 2569 if (curop->op_type == OP_GV) {
2570 GV *gv = ((GVOP*)curop)->op_gv;
ce862d02 2571 repl_has_vars = 1;
93a17b20 2572 if (strchr("&`'123456789+", *GvENAME(gv)))
79072805
LW		 2573 break;
2574 }
554b3eca 2575#endif /* USE_THREADS */
79072805
LW		 2576 else if (curop->op_type == OP_RV2CV)
2577 break;
2578 else if (curop->op_type == OP_RV2SV ||
2579 curop->op_type == OP_RV2AV ||
2580 curop->op_type == OP_RV2HV ||
2581 curop->op_type == OP_RV2GV) {
2582 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2583 break;
2584 }
748a9306
LW		 2585 else if (curop->op_type == OP_PADSV ||
2586 curop->op_type == OP_PADAV ||
2587 curop->op_type == OP_PADHV ||
554b3eca 2588 curop->op_type == OP_PADANY) {
ce862d02 2589 repl_has_vars = 1;
748a9306 2590 }
1167e5da
SM		 2591 else if (curop->op_type == OP_PUSHRE)
2592 ; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 2593 else
2594 break;
2595 }
2596 lastop = curop;
2597 }
748a9306 2598 }
ce862d02
IZ		 2599 if (curop == repl
2600 && !(repl_has_vars
2601 && (!pm->op_pmregexp
2602 || pm->op_pmregexp->reganch & ROPT_EVAL_SEEN))) {
748a9306 2603 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2604 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2605 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2606 }
2607 else {
ce862d02
IZ		 2608 if (curop == repl && !pm->op_pmregexp) { /* Has variables. */
2609 pm->op_pmflags |= PMf_MAYBE_CONST;
2610 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2611 }
b7dc083c 2612 NewOp(1101, rcop, 1, LOGOP);
748a9306 2613 rcop->op_type = OP_SUBSTCONT;
22c35a8c 2614 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 2615 rcop->op_first = scalar(repl);
2616 rcop->op_flags |= OPf_KIDS;
2617 rcop->op_private = 1;
11343788 2618 rcop->op_other = o;
748a9306
LW		 2619
2620 /* establish postfix order */
2621 rcop->op_next = LINKLIST(repl);
2622 repl->op_next = (OP*)rcop;
2623
2624 pm->op_pmreplroot = scalar((OP*)rcop);
2625 pm->op_pmreplstart = LINKLIST(rcop);
2626 rcop->op_next = 0;
79072805
LW		 2627 }
2628 }
2629
2630 return (OP*)pm;
2631}
2632
2633OP *
8ac85365 2634newSVOP(I32 type, I32 flags, SV *sv)
79072805
LW		 2635{
2636 SVOP *svop;
b7dc083c 2637 NewOp(1101, svop, 1, SVOP);
79072805 2638 svop->op_type = type;
22c35a8c 2639 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2640 svop->op_sv = sv;
2641 svop->op_next = (OP*)svop;
2642 svop->op_flags = flags;
22c35a8c 2643 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2644 scalar((OP*)svop);
22c35a8c 2645 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2646 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2647 return CHECKOP(type, svop);
79072805
LW		 2648}
2649
2650OP *
8ac85365 2651newGVOP(I32 type, I32 flags, GV *gv)
79072805 2652{
11343788 2653 dTHR;
79072805 2654 GVOP *gvop;
b7dc083c 2655 NewOp(1101, gvop, 1, GVOP);
79072805 2656 gvop->op_type = type;
22c35a8c 2657 gvop->op_ppaddr = PL_ppaddr[type];
8990e307 2658 gvop->op_gv = (GV*)SvREFCNT_inc(gv);
79072805
LW		 2659 gvop->op_next = (OP*)gvop;
2660 gvop->op_flags = flags;
22c35a8c 2661 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2662 scalar((OP*)gvop);
22c35a8c 2663 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2664 gvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2665 return CHECKOP(type, gvop);
79072805
LW		 2666}
2667
2668OP *
8ac85365 2669newPVOP(I32 type, I32 flags, char *pv)
79072805
LW		 2670{
2671 PVOP *pvop;
b7dc083c 2672 NewOp(1101, pvop, 1, PVOP);
79072805 2673 pvop->op_type = type;
22c35a8c 2674 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2675 pvop->op_pv = pv;
2676 pvop->op_next = (OP*)pvop;
2677 pvop->op_flags = flags;
22c35a8c 2678 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2679 scalar((OP*)pvop);
22c35a8c 2680 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2681 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2682 return CHECKOP(type, pvop);
79072805
LW		 2683}
2684
79072805 2685void
8ac85365 2686package(OP *o)
79072805 2687{
11343788 2688 dTHR;
93a17b20 2689 SV *sv;
79072805 2690
3280af22
NIS		 2691 save_hptr(&PL_curstash);
2692 save_item(PL_curstname);
11343788 2693 if (o) {
463ee0b2
LW		 2694 STRLEN len;
2695 char *name;
11343788 2696 sv = cSVOPo->op_sv;
463ee0b2 2697 name = SvPV(sv, len);
3280af22
NIS		 2698 PL_curstash = gv_stashpvn(name,len,TRUE);
2699 sv_setpvn(PL_curstname, name, len);
11343788 2700 op_free(o);
93a17b20
LW		 2701 }
2702 else {
3280af22
NIS		 2703 sv_setpv(PL_curstname,"<none>");
2704 PL_curstash = Nullhv;
93a17b20 2705 }
7ad382f4 2706 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 2707 PL_copline = NOLINE;
2708 PL_expect = XSTATE;
79072805
LW		 2709}
2710
85e6fe83 2711void
8ac85365 2712utilize(int aver, I32 floor, OP *version, OP *id, OP *arg)
85e6fe83 2713{
a0d0e21e
LW		 2714 OP *pack;
2715 OP *meth;
2716 OP *rqop;
2717 OP *imop;
b1cb66bf 2718 OP *veop;
78ca652e 2719 GV *gv;
85e6fe83 2720
a0d0e21e
LW		 2721 if (id->op_type != OP_CONST)
2722 croak("Module name must be constant");
85e6fe83 2723
b1cb66bf 2724 veop = Nullop;
2725
2726 if(version != Nullop) {
2727 SV *vesv = ((SVOP*)version)->op_sv;
2728
2729 if (arg == Nullop && !SvNIOK(vesv)) {
2730 arg = version;
2731 }
2732 else {
2733 OP *pack;
2734 OP *meth;
2735
2736 if (version->op_type != OP_CONST || !SvNIOK(vesv))
2737 croak("Version number must be constant number");
2738
2739 /* Make copy of id so we don't free it twice */
2740 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
2741
2742 /* Fake up a method call to VERSION */
79cb57f6 2743 meth = newSVOP(OP_CONST, 0, newSVpvn("VERSION", 7));
b1cb66bf 2744 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
2745 append_elem(OP_LIST,
2746 prepend_elem(OP_LIST, pack, list(version)),
2747 newUNOP(OP_METHOD, 0, meth)));
2748 }
2749 }
aeea060c 2750
a0d0e21e 2751 /* Fake up an import/unimport */
4633a7c4
LW		 2752 if (arg && arg->op_type == OP_STUB)
2753 imop = arg; /* no import on explicit () */
b1cb66bf 2754 else if(SvNIOK(((SVOP*)id)->op_sv)) {
2755 imop = Nullop; /* use 5.0; */
2756 }
4633a7c4
LW		 2757 else {
2758 /* Make copy of id so we don't free it twice */
2759 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
4633a7c4
LW		 2760 meth = newSVOP(OP_CONST, 0,
2761 aver
79cb57f6
GS		 2762 ? newSVpvn("import", 6)
2763 : newSVpvn("unimport", 8)
4633a7c4
LW		 2764 );
2765 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
a0d0e21e
LW		 2766 append_elem(OP_LIST,
2767 prepend_elem(OP_LIST, pack, list(arg)),
2768 newUNOP(OP_METHOD, 0, meth)));
4633a7c4
LW		 2769 }
2770
78ca652e
GS		 2771 /* Fake up a require, handle override, if any */
2772 gv = gv_fetchpv("require", FALSE, SVt_PVCV);
2773 if (!(gv && GvIMPORTED_CV(gv)))
2774 gv = gv_fetchpv("CORE::GLOBAL::require", FALSE, SVt_PVCV);
2775
2776 if (gv && GvIMPORTED_CV(gv)) {
2777 rqop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
2778 append_elem(OP_LIST, id,
2779 scalar(newUNOP(OP_RV2CV, 0,
2780 newGVOP(OP_GV, 0,
2781 gv))))));
2782 }
2783 else {
2784 rqop = newUNOP(OP_REQUIRE, 0, id);
2785 }
a0d0e21e
LW		 2786
2787 /* Fake up the BEGIN {}, which does its thing immediately. */
c07a80fd 2788 newSUB(floor,
79cb57f6 2789 newSVOP(OP_CONST, 0, newSVpvn("BEGIN", 5)),
4633a7c4 2790 Nullop,
a0d0e21e 2791 append_elem(OP_LINESEQ,
b1cb66bf 2792 append_elem(OP_LINESEQ,
2793 newSTATEOP(0, Nullch, rqop),
2794 newSTATEOP(0, Nullch, veop)),
a0d0e21e 2795 newSTATEOP(0, Nullch, imop) ));
85e6fe83 2796
3280af22
NIS		 2797 PL_copline = NOLINE;
2798 PL_expect = XSTATE;
85e6fe83
LW		 2799}
2800
79072805 2801OP *
78ca652e
GS		 2802dofile(OP *term)
2803{
2804 OP *doop;
2805 GV *gv;
2806
2807 gv = gv_fetchpv("do", FALSE, SVt_PVCV);
2808 if (!(gv && GvIMPORTED_CV(gv)))
2809 gv = gv_fetchpv("CORE::GLOBAL::do", FALSE, SVt_PVCV);
2810
2811 if (gv && GvIMPORTED_CV(gv)) {
2812 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
2813 append_elem(OP_LIST, term,
2814 scalar(newUNOP(OP_RV2CV, 0,
2815 newGVOP(OP_GV, 0,
2816 gv))))));
2817 }
2818 else {
2819 doop = newUNOP(OP_DOFILE, 0, scalar(term));
2820 }
2821 return doop;
2822}
2823
2824OP *
8ac85365 2825newSLICEOP(I32 flags, OP *subscript, OP *listval)
79072805
LW		 2826{
2827 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 2828 list(force_list(subscript)),
2829 list(force_list(listval)) );
79072805
LW		 2830}
2831
76e3520e 2832STATIC I32
8ac85365 2833list_assignment(register OP *o)
79072805 2834{
11343788 2835 if (!o)
79072805
LW		 2836 return TRUE;
2837
11343788
MB		 2838 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
2839 o = cUNOPo->op_first;
79072805 2840
11343788
MB		 2841 if (o->op_type == OP_COND_EXPR) {
2842 I32 t = list_assignment(cCONDOPo->op_first->op_sibling);
2843 I32 f = list_assignment(cCONDOPo->op_first->op_sibling->op_sibling);
79072805
LW		 2844
2845 if (t && f)
2846 return TRUE;
2847 if (t || f)
2848 yyerror("Assignment to both a list and a scalar");
2849 return FALSE;
2850 }
2851
11343788
MB		 2852 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
2853 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
2854 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 2855 return TRUE;
2856
11343788 2857 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 2858 return TRUE;
2859
11343788 2860 if (o->op_type == OP_RV2SV)
79072805
LW		 2861 return FALSE;
2862
2863 return FALSE;
2864}
2865
2866OP *
8ac85365 2867newASSIGNOP(I32 flags, OP *left, I32 optype, OP *right)
79072805 2868{
11343788 2869 OP *o;
79072805 2870
a0d0e21e
LW		 2871 if (optype) {
2872 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN) {
2873 return newLOGOP(optype, 0,
2874 mod(scalar(left), optype),
2875 newUNOP(OP_SASSIGN, 0, scalar(right)));
2876 }
2877 else {
2878 return newBINOP(optype, OPf_STACKED,
2879 mod(scalar(left), optype), scalar(right));
2880 }
2881 }
2882
79072805 2883 if (list_assignment(left)) {
6ee623d5 2884 dTHR;
3280af22
NIS		 2885 PL_modcount = 0;
2886 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
463ee0b2 2887 left = mod(left, OP_AASSIGN);
3280af22
NIS		 2888 if (PL_eval_start)
2889 PL_eval_start = 0;
748a9306 2890 else {
a0d0e21e
LW		 2891 op_free(left);
2892 op_free(right);
2893 return Nullop;
2894 }
11343788 2895 o = newBINOP(OP_AASSIGN, flags,
8990e307
LW		 2896 list(force_list(right)),
2897 list(force_list(left)) );
11343788 2898 o->op_private = 0 | (flags >> 8);
a0d0e21e 2899 if (!(left->op_private & OPpLVAL_INTRO)) {
79072805 2900 OP *curop;
11343788 2901 OP *lastop = o;
3280af22 2902 PL_generation++;
11343788 2903 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 2904 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805
LW		 2905 if (curop->op_type == OP_GV) {
2906 GV *gv = ((GVOP*)curop)->op_gv;
3280af22 2907 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
79072805 2908 break;
3280af22 2909 SvCUR(gv) = PL_generation;
79072805 2910 }
748a9306
LW		 2911 else if (curop->op_type == OP_PADSV ||
2912 curop->op_type == OP_PADAV ||
2913 curop->op_type == OP_PADHV ||
2914 curop->op_type == OP_PADANY) {
3280af22 2915 SV **svp = AvARRAY(PL_comppad_name);
8e07c86e 2916 SV *sv = svp[curop->op_targ];
3280af22 2917 if (SvCUR(sv) == PL_generation)
748a9306 2918 break;
3280af22 2919 SvCUR(sv) = PL_generation; /* (SvCUR not used any more) */
748a9306 2920 }
79072805
LW		 2921 else if (curop->op_type == OP_RV2CV)
2922 break;
2923 else if (curop->op_type == OP_RV2SV ||
2924 curop->op_type == OP_RV2AV ||
2925 curop->op_type == OP_RV2HV ||
2926 curop->op_type == OP_RV2GV) {
2927 if (lastop->op_type != OP_GV) /* funny deref? */
2928 break;
2929 }
1167e5da
SM		 2930 else if (curop->op_type == OP_PUSHRE) {
2931 if (((PMOP*)curop)->op_pmreplroot) {
2932 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
3280af22 2933 if (gv == PL_defgv || SvCUR(gv) == PL_generation)
1167e5da 2934 break;
3280af22 2935 SvCUR(gv) = PL_generation;
1167e5da
SM		 2936 }
2937 }
79072805
LW		 2938 else
2939 break;
2940 }
2941 lastop = curop;
2942 }
11343788
MB		 2943 if (curop != o)
2944 o->op_private = OPpASSIGN_COMMON;
79072805 2945 }
c07a80fd 2946 if (right && right->op_type == OP_SPLIT) {
2947 OP* tmpop;
2948 if ((tmpop = ((LISTOP*)right)->op_first) &&
2949 tmpop->op_type == OP_PUSHRE)
2950 {
2951 PMOP *pm = (PMOP*)tmpop;
2952 if (left->op_type == OP_RV2AV &&
2953 !(left->op_private & OPpLVAL_INTRO) &&
11343788 2954 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 2955 {
2956 tmpop = ((UNOP*)left)->op_first;
2957 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
2958 pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
2959 pm->op_pmflags |= PMf_ONCE;
11343788 2960 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 2961 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
2962 tmpop->op_sibling = Nullop; /* don't free split */
2963 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 2964 op_free(o); /* blow off assign */
54310121 2965 right->op_flags &= ~OPf_WANT;
a5f75d66 2966 /* "I don't know and I don't care." */
c07a80fd 2967 return right;
2968 }
2969 }
2970 else {
3280af22 2971 if (PL_modcount < 10000 &&
c07a80fd 2972 ((LISTOP*)right)->op_last->op_type == OP_CONST)
2973 {
2974 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
2975 if (SvIVX(sv) == 0)
3280af22 2976 sv_setiv(sv, PL_modcount+1);
c07a80fd 2977 }
2978 }
2979 }
2980 }
11343788 2981 return o;
79072805
LW		 2982 }
2983 if (!right)
2984 right = newOP(OP_UNDEF, 0);
2985 if (right->op_type == OP_READLINE) {
2986 right->op_flags |= OPf_STACKED;
463ee0b2 2987 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 2988 }
a0d0e21e 2989 else {
3280af22 2990 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 2991 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 2992 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 2993 if (PL_eval_start)
2994 PL_eval_start = 0;
748a9306 2995 else {
11343788 2996 op_free(o);
a0d0e21e
LW		 2997 return Nullop;
2998 }
2999 }
11343788 3000 return o;
79072805
LW		 3001}
3002
3003OP *
8ac85365 3004newSTATEOP(I32 flags, char *label, OP *o)
79072805 3005{
11343788 3006 dTHR;
bbce6d69 3007 U32 seq = intro_my();
79072805
LW		 3008 register COP *cop;
3009
b7dc083c 3010 NewOp(1101, cop, 1, COP);
3280af22 3011 if (PERLDB_LINE && PL_curcop->cop_line && PL_curstash != PL_debstash) {
8990e307 3012 cop->op_type = OP_DBSTATE;
22c35a8c 3013 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 3014 }
3015 else {
3016 cop->op_type = OP_NEXTSTATE;
22c35a8c 3017 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 3018 }
79072805 3019 cop->op_flags = flags;
a0ed51b3 3020 cop->op_private = (PL_hints & HINT_UTF8);
ff0cee69 3021#ifdef NATIVE_HINTS
3022 cop->op_private |= NATIVE_HINTS;
3023#endif
e24b16f9 3024 PL_compiling.op_private = cop->op_private;
79072805
LW		 3025 cop->op_next = (OP*)cop;
3026
463ee0b2
LW		 3027 if (label) {
3028 cop->cop_label = label;
3280af22 3029 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 3030 }
bbce6d69 3031 cop->cop_seq = seq;
3280af22 3032 cop->cop_arybase = PL_curcop->cop_arybase;
599cee73
PM		 3033 if (PL_curcop->cop_warnings == WARN_NONE
3034 || PL_curcop->cop_warnings == WARN_ALL)
3035 cop->cop_warnings = PL_curcop->cop_warnings ;
3036 else
3037 cop->cop_warnings = newSVsv(PL_curcop->cop_warnings) ;
3038
79072805 3039
3280af22
NIS		 3040 if (PL_copline == NOLINE)
3041 cop->cop_line = PL_curcop->cop_line;
79072805 3042 else {
3280af22
NIS		 3043 cop->cop_line = PL_copline;
3044 PL_copline = NOLINE;
79072805 3045 }
3280af22
NIS		 3046 cop->cop_filegv = (GV*)SvREFCNT_inc(PL_curcop->cop_filegv);
3047 cop->cop_stash = PL_curstash;
79072805 3048
3280af22
NIS		 3049 if (PERLDB_LINE && PL_curstash != PL_debstash) {
3050 SV **svp = av_fetch(GvAV(PL_curcop->cop_filegv),(I32)cop->cop_line, FALSE);
3051 if (svp && *svp != &PL_sv_undef && !SvIOK(*svp)) {
a0d0e21e 3052 (void)SvIOK_on(*svp);
a5f75d66 3053 SvIVX(*svp) = 1;
93a17b20
LW		 3054 SvSTASH(*svp) = (HV*)cop;
3055 }
3056 }
3057
11343788 3058 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3059}
3060
bbce6d69 3061/* "Introduce" my variables to visible status. */
3062U32
8ac85365 3063intro_my(void)
bbce6d69 3064{
3065 SV **svp;
3066 SV *sv;
3067 I32 i;
3068
3280af22
NIS		 3069 if (! PL_min_intro_pending)
3070 return PL_cop_seqmax;
bbce6d69 3071
3280af22
NIS		 3072 svp = AvARRAY(PL_comppad_name);
3073 for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
3074 if ((sv = svp[i]) && sv != &PL_sv_undef && !SvIVX(sv)) {
c53d7c7d 3075 SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */
3280af22 3076 SvNVX(sv) = (double)PL_cop_seqmax;
bbce6d69 3077 }
3078 }
3280af22
NIS		 3079 PL_min_intro_pending = 0;
3080 PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
3081 return PL_cop_seqmax++;
bbce6d69 3082}
3083
79072805 3084OP *
8ac85365 3085newLOGOP(I32 type, I32 flags, OP *first, OP *other)
79072805 3086{
883ffac3
CS		 3087 return new_logop(type, flags, &first, &other);
3088}
3089
3bd495df 3090STATIC OP *
883ffac3
CS		 3091new_logop(I32 type, I32 flags, OP** firstp, OP** otherp)
3092{
11343788 3093 dTHR;
79072805 3094 LOGOP *logop;
11343788 3095 OP *o;
883ffac3
CS		 3096 OP *first = *firstp;
3097 OP *other = *otherp;
79072805 3098
a0d0e21e
LW		 3099 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
3100 return newBINOP(type, flags, scalar(first), scalar(other));
3101
8990e307 3102 scalarboolean(first);
79072805
LW		 3103 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
3104 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
3105 if (type == OP_AND || type == OP_OR) {
3106 if (type == OP_AND)
3107 type = OP_OR;
3108 else
3109 type = OP_AND;
11343788 3110 o = first;
883ffac3 3111 first = *firstp = cUNOPo->op_first;
11343788
MB		 3112 if (o->op_next)
3113 first->op_next = o->op_next;
3114 cUNOPo->op_first = Nullop;
3115 op_free(o);
79072805
LW		 3116 }
3117 }
3118 if (first->op_type == OP_CONST) {
599cee73
PM		 3119 if (ckWARN(WARN_PRECEDENCE) && (first->op_private & OPpCONST_BARE))
3120 warner(WARN_PRECEDENCE, "Probable precedence problem on %s",
22c35a8c 3121 PL_op_desc[type]);
79072805
LW		 3122 if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
3123 op_free(first);
883ffac3 3124 *firstp = Nullop;
79072805
LW		 3125 return other;
3126 }
3127 else {
3128 op_free(other);
883ffac3 3129 *otherp = Nullop;
79072805
LW		 3130 return first;
3131 }
3132 }
3133 else if (first->op_type == OP_WANTARRAY) {
3134 if (type == OP_AND)
3135 list(other);
3136 else
3137 scalar(other);
3138 }
599cee73 3139 else if (ckWARN(WARN_UNSAFE) && (first->op_flags & OPf_KIDS)) {
a6006777 3140 OP *k1 = ((UNOP*)first)->op_first;
3141 OP *k2 = k1->op_sibling;
3142 OPCODE warnop = 0;
3143 switch (first->op_type)
3144 {
3145 case OP_NULL:
3146 if (k2 && k2->op_type == OP_READLINE
3147 && (k2->op_flags & OPf_STACKED)
55d729e4 3148 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
a6006777 3149 warnop = k2->op_type;
3150 break;
3151
3152 case OP_SASSIGN:
68dc0745 3153 if (k1->op_type == OP_READDIR
3154 || k1->op_type == OP_GLOB
3155 || k1->op_type == OP_EACH)
a6006777 3156 warnop = k1->op_type;
3157 break;
3158 }
8ebc5c01 3159 if (warnop) {
3280af22
NIS		 3160 line_t oldline = PL_curcop->cop_line;
3161 PL_curcop->cop_line = PL_copline;
599cee73
PM		 3162 warner(WARN_UNSAFE,
3163 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 3164 PL_op_desc[warnop],
68dc0745 3165 ((warnop == OP_READLINE || warnop == OP_GLOB)
3166 ? " construct" : "() operator"));
3280af22 3167 PL_curcop->cop_line = oldline;
8ebc5c01 3168 }
a6006777 3169 }
79072805
LW		 3170
3171 if (!other)
3172 return first;
3173
a0d0e21e
LW		 3174 if (type == OP_ANDASSIGN || type == OP_ORASSIGN)
3175 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
3176
b7dc083c 3177 NewOp(1101, logop, 1, LOGOP);
79072805
LW		 3178
3179 logop->op_type = type;
22c35a8c 3180 logop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3181 logop->op_first = first;
3182 logop->op_flags = flags | OPf_KIDS;
3183 logop->op_other = LINKLIST(other);
c07a80fd 3184 logop->op_private = 1 | (flags >> 8);
79072805
LW		 3185
3186 /* establish postfix order */
3187 logop->op_next = LINKLIST(first);
3188 first->op_next = (OP*)logop;
3189 first->op_sibling = other;
3190
11343788
MB		 3191 o = newUNOP(OP_NULL, 0, (OP*)logop);
3192 other->op_next = o;
79072805 3193
11343788 3194 return o;
79072805
LW		 3195}
3196
3197OP *
8ac85365 3198newCONDOP(I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 3199{
11343788 3200 dTHR;
79072805 3201 CONDOP *condop;
11343788 3202 OP *o;
79072805 3203
b1cb66bf 3204 if (!falseop)
3205 return newLOGOP(OP_AND, 0, first, trueop);
3206 if (!trueop)
3207 return newLOGOP(OP_OR, 0, first, falseop);
79072805 3208
8990e307 3209 scalarboolean(first);
79072805
LW		 3210 if (first->op_type == OP_CONST) {
3211 if (SvTRUE(((SVOP*)first)->op_sv)) {
3212 op_free(first);
b1cb66bf 3213 op_free(falseop);
3214 return trueop;
79072805
LW		 3215 }
3216 else {
3217 op_free(first);
b1cb66bf 3218 op_free(trueop);
3219 return falseop;
79072805
LW		 3220 }
3221 }
3222 else if (first->op_type == OP_WANTARRAY) {
b1cb66bf 3223 list(trueop);
3224 scalar(falseop);
79072805 3225 }
b7dc083c 3226 NewOp(1101, condop, 1, CONDOP);
79072805
LW		 3227
3228 condop->op_type = OP_COND_EXPR;
22c35a8c 3229 condop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
79072805
LW		 3230 condop->op_first = first;
3231 condop->op_flags = flags | OPf_KIDS;
b1cb66bf 3232 condop->op_true = LINKLIST(trueop);
3233 condop->op_false = LINKLIST(falseop);
c07a80fd 3234 condop->op_private = 1 | (flags >> 8);
79072805
LW		 3235
3236 /* establish postfix order */
3237 condop->op_next = LINKLIST(first);
3238 first->op_next = (OP*)condop;
3239
b1cb66bf 3240 first->op_sibling = trueop;
3241 trueop->op_sibling = falseop;
11343788 3242 o = newUNOP(OP_NULL, 0, (OP*)condop);
79072805 3243
5dc0d613
MB		 3244 trueop->op_next = o;
3245 falseop->op_next = o;
79072805 3246
11343788 3247 return o;
79072805
LW		 3248}
3249
3250OP *
8ac85365 3251newRANGE(I32 flags, OP *left, OP *right)
79072805 3252{
b35b2403 3253 dTHR;
79072805
LW		 3254 CONDOP *condop;
3255 OP *flip;
3256 OP *flop;
11343788 3257 OP *o;
79072805 3258
b7dc083c 3259 NewOp(1101, condop, 1, CONDOP);
79072805
LW		 3260
3261 condop->op_type = OP_RANGE;
22c35a8c 3262 condop->op_ppaddr = PL_ppaddr[OP_RANGE];
79072805
LW		 3263 condop->op_first = left;
3264 condop->op_flags = OPf_KIDS;
3265 condop->op_true = LINKLIST(left);
3266 condop->op_false = LINKLIST(right);
c07a80fd 3267 condop->op_private = 1 | (flags >> 8);
79072805
LW		 3268
3269 left->op_sibling = right;
3270
3271 condop->op_next = (OP*)condop;
3272 flip = newUNOP(OP_FLIP, flags, (OP*)condop);
3273 flop = newUNOP(OP_FLOP, 0, flip);
11343788 3274 o = newUNOP(OP_NULL, 0, flop);
79072805
LW		 3275 linklist(flop);
3276
3277 left->op_next = flip;
3278 right->op_next = flop;
3279
ed6116ce 3280 condop->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805 3281 sv_upgrade(PAD_SV(condop->op_targ), SVt_PVNV);
ed6116ce 3282 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 3283 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
3284
3285 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3286 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3287
11343788 3288 flip->op_next = o;
79072805 3289 if (!flip->op_private || !flop->op_private)
11343788 3290 linklist(o); /* blow off optimizer unless constant */
79072805 3291
11343788 3292 return o;
79072805
LW		 3293}
3294
3295OP *
8ac85365 3296newLOOPOP(I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 3297{
11343788 3298 dTHR;
463ee0b2 3299 OP* listop;
11343788 3300 OP* o;
463ee0b2 3301 int once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 3302 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
93a17b20 3303
463ee0b2
LW		 3304 if (expr) {
3305 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
3306 return block; /* do {} while 0 does once */
fb73857a 3307 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3308 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 3309 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3310 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3311 } else if (expr->op_flags & OPf_KIDS) {
3312 OP *k1 = ((UNOP*)expr)->op_first;
3313 OP *k2 = (k1) ? k1->op_sibling : NULL;
3314 switch (expr->op_type) {
3315 case OP_NULL:
3316 if (k2 && k2->op_type == OP_READLINE
3317 && (k2->op_flags & OPf_STACKED)
3318 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3319 expr = newUNOP(OP_DEFINED, 0, expr);
3320 break;
3321
3322 case OP_SASSIGN:
3323 if (k1->op_type == OP_READDIR
3324 || k1->op_type == OP_GLOB
3325 || k1->op_type == OP_EACH)
3326 expr = newUNOP(OP_DEFINED, 0, expr);
3327 break;
3328 }
774d564b 3329 }
463ee0b2 3330 }
93a17b20 3331
8990e307 3332 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 3333 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 3334
883ffac3
CS		 3335 if (listop)
3336 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 3337
11343788
MB		 3338 if (once && o != listop)
3339 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 3340
11343788
MB		 3341 if (o == listop)
3342 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 3343
11343788
MB		 3344 o->op_flags |= flags;
3345 o = scope(o);
3346 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
3347 return o;
79072805
LW		 3348}
3349
3350OP *
8ac85365 3351newWHILEOP(I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *expr, OP *block, OP *cont)
79072805 3352{
11343788 3353 dTHR;
79072805
LW		 3354 OP *redo;
3355 OP *next = 0;
3356 OP *listop;
11343788 3357 OP *o;
79072805
LW		 3358 OP *condop;
3359
fb73857a 3360 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3361 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 3362 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3363 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4
GS		 3364 } else if (expr && (expr->op_flags & OPf_KIDS)) {
3365 OP *k1 = ((UNOP*)expr)->op_first;
3366 OP *k2 = (k1) ? k1->op_sibling : NULL;
3367 switch (expr->op_type) {
3368 case OP_NULL:
3369 if (k2 && k2->op_type == OP_READLINE
3370 && (k2->op_flags & OPf_STACKED)
3371 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
3372 expr = newUNOP(OP_DEFINED, 0, expr);
3373 break;
3374
3375 case OP_SASSIGN:
3376 if (k1->op_type == OP_READDIR
3377 || k1->op_type == OP_GLOB
3378 || k1->op_type == OP_EACH)
3379 expr = newUNOP(OP_DEFINED, 0, expr);
3380 break;
3381 }
748a9306 3382 }
79072805
LW		 3383
3384 if (!block)
3385 block = newOP(OP_NULL, 0);
3386
3387 if (cont)
3388 next = LINKLIST(cont);
fb73857a 3389 if (expr) {
79072805 3390 cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
fb73857a 3391 if ((line_t)whileline != NOLINE) {
3280af22 3392 PL_copline = whileline;
fb73857a 3393 cont = append_elem(OP_LINESEQ, cont,
3394 newSTATEOP(0, Nullch, Nullop));
3395 }
3396 }
79072805 3397
463ee0b2 3398 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 3399 redo = LINKLIST(listop);
3400
3401 if (expr) {
3280af22 3402 PL_copline = whileline;
883ffac3
CS		 3403 scalar(listop);
3404 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 3405 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 3406 op_free(expr); /* oops, it's a while (0) */
463ee0b2 3407 op_free((OP*)loop);
883ffac3 3408 return Nullop; /* listop already freed by new_logop */
463ee0b2 3409 }
883ffac3
CS		 3410 if (listop)
3411 ((LISTOP*)listop)->op_last->op_next = condop =
3412 (o == listop ? redo : LINKLIST(o));
79072805
LW		 3413 if (!next)
3414 next = condop;
3415 }
3416 else
11343788 3417 o = listop;
79072805
LW		 3418
3419 if (!loop) {
b7dc083c 3420 NewOp(1101,loop,1,LOOP);
79072805 3421 loop->op_type = OP_ENTERLOOP;
22c35a8c 3422 loop->op_ppaddr = PL_ppaddr[OP_ENTERLOOP];
79072805
LW		 3423 loop->op_private = 0;
3424 loop->op_next = (OP*)loop;
3425 }
3426
11343788 3427 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 3428
3429 loop->op_redoop = redo;
11343788 3430 loop->op_lastop = o;
79072805
LW		 3431
3432 if (next)
3433 loop->op_nextop = next;
3434 else
11343788 3435 loop->op_nextop = o;
79072805 3436
11343788
MB		 3437 o->op_flags |= flags;
3438 o->op_private |= (flags >> 8);
3439 return o;
79072805
LW		 3440}
3441
3442OP *
8990e307 3443newFOROP(I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
79072805
LW		 3444{
3445 LOOP *loop;
b7dc083c 3446 LOOP *tmp;
fb73857a 3447 OP *wop;
85e6fe83 3448 int padoff = 0;
4633a7c4 3449 I32 iterflags = 0;
79072805 3450
79072805 3451 if (sv) {
85e6fe83 3452 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
748a9306 3453 sv->op_type = OP_RV2GV;
22c35a8c 3454 sv->op_ppaddr = PL_ppaddr[OP_RV2GV];
79072805 3455 }
85e6fe83
LW		 3456 else if (sv->op_type == OP_PADSV) { /* private variable */
3457 padoff = sv->op_targ;
3458 op_free(sv);
3459 sv = Nullop;
3460 }
54b9620d
MB		 3461 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
3462 padoff = sv->op_targ;
3463 iterflags |= OPf_SPECIAL;
3464 op_free(sv);
3465 sv = Nullop;
3466 }
79072805 3467 else
22c35a8c 3468 croak("Can't use %s for loop variable", PL_op_desc[sv->op_type]);
79072805
LW		 3469 }
3470 else {
54b9620d
MB		 3471#ifdef USE_THREADS
3472 padoff = find_threadsv("_");
3473 iterflags |= OPf_SPECIAL;
3474#else
3280af22 3475 sv = newGVOP(OP_GV, 0, PL_defgv);
54b9620d 3476#endif
79072805 3477 }
5f05dabc 3478 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 3479 expr = mod(force_list(scalar(ref(expr, OP_ITER))), OP_GREPSTART);
4633a7c4
LW		 3480 iterflags |= OPf_STACKED;
3481 }
89ea2908
GA		 3482 else if (expr->op_type == OP_NULL &&
3483 (expr->op_flags & OPf_KIDS) &&
3484 ((BINOP*)expr)->op_first->op_type == OP_FLOP)
3485 {
3486 /* Basically turn for($x..$y) into the same as for($x,$y), but we
3487 * set the STACKED flag to indicate that these values are to be
3488 * treated as min/max values by 'pp_iterinit'.
3489 */
3490 UNOP* flip = (UNOP*)((UNOP*)((BINOP*)expr)->op_first)->op_first;
3491 CONDOP* range = (CONDOP*) flip->op_first;
3492 OP* left = range->op_first;
3493 OP* right = left->op_sibling;
5152d7c7 3494 LISTOP* listop;
89ea2908
GA		 3495
3496 range->op_flags &= ~OPf_KIDS;
3497 range->op_first = Nullop;
3498
5152d7c7
GS		 3499 listop = (LISTOP*)newLISTOP(OP_LIST, 0, left, right);
3500 listop->op_first->op_next = range->op_true;
89ea2908 3501 left->op_next = range->op_false;
5152d7c7
GS		 3502 right->op_next = (OP*)listop;
3503 listop->op_next = listop->op_first;
89ea2908
GA		 3504
3505 op_free(expr);
5152d7c7 3506 expr = (OP*)(listop);
89ea2908
GA		 3507 null(expr);
3508 iterflags |= OPf_STACKED;
3509 }
3510 else {
3511 expr = mod(force_list(expr), OP_GREPSTART);
3512 }
3513
3514
4633a7c4 3515 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
89ea2908 3516 append_elem(OP_LIST, expr, scalar(sv))));
85e6fe83 3517 assert(!loop->op_next);
b7dc083c
NIS		 3518#ifdef PL_OP_SLAB_ALLOC
3519 NewOp(1234,tmp,1,LOOP);
3520 Copy(loop,tmp,1,LOOP);
3521 loop = tmp;
3522#else
85e6fe83 3523 Renew(loop, 1, LOOP);
b7dc083c 3524#endif
85e6fe83 3525 loop->op_targ = padoff;
fb73857a 3526 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont);
3280af22 3527 PL_copline = forline;
fb73857a