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Remove obsolete error messages
[perl5.git] / op.c
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a0d0e21e 1/* op.c
79072805 2 *
4bb101f2 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
cbdf9ef8 4 * 2000, 2001, 2002, 2003, 2004, 2005, by Larry Wall and others
79072805
LW		 5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW		 9 */
10
11/*
12 * "You see: Mr. Drogo, he married poor Miss Primula Brandybuck. She was
13 * our Mr. Bilbo's first cousin on the mother's side (her mother being the
14 * youngest of the Old Took's daughters); and Mr. Drogo was his second
15 * cousin. So Mr. Frodo is his first *and* second cousin, once removed
16 * either way, as the saying is, if you follow me." --the Gaffer
79072805
LW		 17 */
18
166f8a29
DM		 19/* This file contains the functions that create, manipulate and optimize
20 * the OP structures that hold a compiled perl program.
21 *
22 * A Perl program is compiled into a tree of OPs. Each op contains
23 * structural pointers (eg to its siblings and the next op in the
24 * execution sequence), a pointer to the function that would execute the
25 * op, plus any data specific to that op. For example, an OP_CONST op
26 * points to the pp_const() function and to an SV containing the constant
27 * value. When pp_const() is executed, its job is to push that SV onto the
28 * stack.
29 *
30 * OPs are mainly created by the newFOO() functions, which are mainly
31 * called from the parser (in perly.y) as the code is parsed. For example
32 * the Perl code $a + $b * $c would cause the equivalent of the following
33 * to be called (oversimplifying a bit):
34 *
35 * newBINOP(OP_ADD, flags,
36 * newSVREF($a),
37 * newBINOP(OP_MULTIPLY, flags, newSVREF($b), newSVREF($c))
38 * )
39 *
40 * Note that during the build of miniperl, a temporary copy of this file
41 * is made, called opmini.c.
42 */
ccfc67b7 43
61b743bb
DM		 44/*
45Perl's compiler is essentially a 3-pass compiler with interleaved phases:
46
47 A bottom-up pass
48 A top-down pass
49 An execution-order pass
50
51The bottom-up pass is represented by all the "newOP" routines and
52the ck_ routines. The bottom-upness is actually driven by yacc.
53So at the point that a ck_ routine fires, we have no idea what the
54context is, either upward in the syntax tree, or either forward or
55backward in the execution order. (The bottom-up parser builds that
56part of the execution order it knows about, but if you follow the "next"
57links around, you'll find it's actually a closed loop through the
58top level node.
59
60Whenever the bottom-up parser gets to a node that supplies context to
61its components, it invokes that portion of the top-down pass that applies
62to that part of the subtree (and marks the top node as processed, so
63if a node further up supplies context, it doesn't have to take the
64plunge again). As a particular subcase of this, as the new node is
65built, it takes all the closed execution loops of its subcomponents
66and links them into a new closed loop for the higher level node. But
67it's still not the real execution order.
68
69The actual execution order is not known till we get a grammar reduction
70to a top-level unit like a subroutine or file that will be called by
71"name" rather than via a "next" pointer. At that point, we can call
72into peep() to do that code's portion of the 3rd pass. It has to be
73recursive, but it's recursive on basic blocks, not on tree nodes.
74*/
75
79072805 76#include "EXTERN.h"
864dbfa3 77#define PERL_IN_OP_C
79072805 78#include "perl.h"
77ca0c92 79#include "keywords.h"
79072805 80
a07e034d 81#define CALL_PEEP(o) CALL_FPTR(PL_peepp)(aTHX_ o)
a2efc822 82
238a4c30
NIS		 83#if defined(PL_OP_SLAB_ALLOC)
84
85#ifndef PERL_SLAB_SIZE
86#define PERL_SLAB_SIZE 2048
87#endif
88
c7e45529
AE		 89void *
90Perl_Slab_Alloc(pTHX_ int m, size_t sz)
1c846c1f 91{
5a8e194f
NIS		 92 /*
93 * To make incrementing use count easy PL_OpSlab is an I32 *
94 * To make inserting the link to slab PL_OpPtr is I32 **
95 * So compute size in units of sizeof(I32 *) as that is how Pl_OpPtr increments
96 * Add an overhead for pointer to slab and round up as a number of pointers
97 */
98 sz = (sz + 2*sizeof(I32 *) -1)/sizeof(I32 *);
238a4c30 99 if ((PL_OpSpace -= sz) < 0) {
083fcd59
JH		 100 PL_OpPtr = (I32 **) PerlMemShared_malloc(PERL_SLAB_SIZE*sizeof(I32*));
101 if (!PL_OpPtr) {
238a4c30
NIS		 102 return NULL;
103 }
5a8e194f
NIS		 104 Zero(PL_OpPtr,PERL_SLAB_SIZE,I32 **);
105 /* We reserve the 0'th I32 sized chunk as a use count */
106 PL_OpSlab = (I32 *) PL_OpPtr;
107 /* Reduce size by the use count word, and by the size we need.
108 * Latter is to mimic the '-=' in the if() above
109 */
110 PL_OpSpace = PERL_SLAB_SIZE - (sizeof(I32)+sizeof(I32 **)-1)/sizeof(I32 **) - sz;
238a4c30
NIS		 111 /* Allocation pointer starts at the top.
112 Theory: because we build leaves before trunk allocating at end
113 means that at run time access is cache friendly upward
114 */
5a8e194f 115 PL_OpPtr += PERL_SLAB_SIZE;
238a4c30
NIS		 116 }
117 assert( PL_OpSpace >= 0 );
118 /* Move the allocation pointer down */
119 PL_OpPtr -= sz;
5a8e194f 120 assert( PL_OpPtr > (I32 **) PL_OpSlab );
238a4c30
NIS		 121 *PL_OpPtr = PL_OpSlab; /* Note which slab it belongs to */
122 (*PL_OpSlab)++; /* Increment use count of slab */
5a8e194f 123 assert( PL_OpPtr+sz <= ((I32 **) PL_OpSlab + PERL_SLAB_SIZE) );
238a4c30
NIS		 124 assert( *PL_OpSlab > 0 );
125 return (void *)(PL_OpPtr + 1);
126}
127
c7e45529
AE		 128void
129Perl_Slab_Free(pTHX_ void *op)
238a4c30 130{
aec46f14
AL		 131 I32 ** const ptr = (I32 **) op;
132 I32 * const slab = ptr[-1];
5a8e194f
NIS		 133 assert( ptr-1 > (I32 **) slab );
134 assert( ptr < ( (I32 **) slab + PERL_SLAB_SIZE) );
238a4c30
NIS		 135 assert( *slab > 0 );
136 if (--(*slab) == 0) {
7e4e8c89
NC		 137# ifdef NETWARE
138# define PerlMemShared PerlMem
139# endif
083fcd59
JH		 140
141 PerlMemShared_free(slab);
238a4c30
NIS		 142 if (slab == PL_OpSlab) {
143 PL_OpSpace = 0;
144 }
145 }
b7dc083c 146}
b7dc083c 147#endif
e50aee73 148/*
5dc0d613 149 * In the following definition, the ", Nullop" is just to make the compiler
a5f75d66 150 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 151 */
11343788 152#define CHECKOP(type,o) \
3280af22 153 ((PL_op_mask && PL_op_mask[type]) \
5dc0d613 154 ? ( op_free((OP*)o), \
cb77fdf0 155 Perl_croak(aTHX_ "'%s' trapped by operation mask", PL_op_desc[type]), \
28757baa 156 Nullop ) \
fc0dc3b3 157 : CALL_FPTR(PL_check[type])(aTHX_ (OP*)o))
e50aee73 158
e6438c1a 159#define RETURN_UNLIMITED_NUMBER (PERL_INT_MAX / 2)
c53d7c7d 160
8b6b16e7 161STATIC const char*
cea2e8a9 162S_gv_ename(pTHX_ GV *gv)
4633a7c4 163{
46c461b5 164 SV* const tmpsv = sv_newmortal();
46fc3d4c 165 gv_efullname3(tmpsv, gv, Nullch);
8b6b16e7 166 return SvPV_nolen_const(tmpsv);
4633a7c4
LW		 167}
168
76e3520e 169STATIC OP *
cea2e8a9 170S_no_fh_allowed(pTHX_ OP *o)
79072805 171{
cea2e8a9 172 yyerror(Perl_form(aTHX_ "Missing comma after first argument to %s function",
53e06cf0 173 OP_DESC(o)));
11343788 174 return o;
79072805
LW		 175}
176
76e3520e 177STATIC OP *
bfed75c6 178S_too_few_arguments(pTHX_ OP *o, const char *name)
79072805 179{
cea2e8a9 180 yyerror(Perl_form(aTHX_ "Not enough arguments for %s", name));
11343788 181 return o;
79072805
LW		 182}
183
76e3520e 184STATIC OP *
bfed75c6 185S_too_many_arguments(pTHX_ OP *o, const char *name)
79072805 186{
cea2e8a9 187 yyerror(Perl_form(aTHX_ "Too many arguments for %s", name));
11343788 188 return o;
79072805
LW		 189}
190
76e3520e 191STATIC void
6867be6d 192S_bad_type(pTHX_ I32 n, const char *t, const char *name, const OP *kid)
8990e307 193{
cea2e8a9 194 yyerror(Perl_form(aTHX_ "Type of arg %d to %s must be %s (not %s)",
53e06cf0 195 (int)n, name, t, OP_DESC(kid)));
8990e307
LW		 196}
197
7a52d87a 198STATIC void
6867be6d 199S_no_bareword_allowed(pTHX_ const OP *o)
7a52d87a 200{
5a844595 201 qerror(Perl_mess(aTHX_
35c1215d
NC		 202 "Bareword \"%"SVf"\" not allowed while \"strict subs\" in use",
203 cSVOPo_sv));
7a52d87a
GS		 204}
205
79072805
LW		 206/* "register" allocation */
207
208PADOFFSET
dd2155a4 209Perl_allocmy(pTHX_ char *name)
93a17b20 210{
a0d0e21e 211 PADOFFSET off;
a0d0e21e 212
59f00321 213 /* complain about "my $<special_var>" etc etc */
155aba94
GS		 214 if (!(PL_in_my == KEY_our ||
215 isALPHA(name[1]) ||
39e02b42 216 (USE_UTF8_IN_NAMES && UTF8_IS_START(name[1])) ||
59f00321 217 (name[1] == '_' && (*name == '$' || (int)strlen(name) > 2))))
834a4ddd 218 {
c4d0567e 219 if (!isPRINT(name[1]) || strchr("\t\n\r\f", name[1])) {
2b92dfce
GS		 220 /* 1999-02-27 mjd@plover.com */
221 char *p;
222 p = strchr(name, '\0');
223 /* The next block assumes the buffer is at least 205 chars
224 long. At present, it's always at least 256 chars. */
225 if (p-name > 200) {
226 strcpy(name+200, "...");
227 p = name+199;
228 }
229 else {
230 p[1] = '\0';
231 }
232 /* Move everything else down one character */
233 for (; p-name > 2; p--)
234 *p = *(p-1);
46fc3d4c 235 name[2] = toCTRL(name[1]);
236 name[1] = '^';
237 }
cea2e8a9 238 yyerror(Perl_form(aTHX_ "Can't use global %s in \"my\"",name));
a0d0e21e 239 }
748a9306 240
dd2155a4
DM		 241 /* check for duplicate declaration */
242 pad_check_dup(name,
c5661c80 243 (bool)(PL_in_my == KEY_our),
dd2155a4
DM		 244 (PL_curstash ? PL_curstash : PL_defstash)
245 );
33b8ce05 246
dd2155a4
DM		 247 if (PL_in_my_stash && *name != '$') {
248 yyerror(Perl_form(aTHX_
249 "Can't declare class for non-scalar %s in \"%s\"",
250 name, PL_in_my == KEY_our ? "our" : "my"));
6b35e009
GS		 251 }
252
dd2155a4 253 /* allocate a spare slot and store the name in that slot */
93a17b20 254
dd2155a4
DM		 255 off = pad_add_name(name,
256 PL_in_my_stash,
257 (PL_in_my == KEY_our
133706a6
RGS		 258 /* $_ is always in main::, even with our */
259 ? (PL_curstash && !strEQ(name,"$_") ? PL_curstash : PL_defstash)
dd2155a4
DM		 260 : Nullhv
261 ),
262 0 /* not fake */
263 );
264 return off;
79072805
LW		 265}
266
79072805
LW		 267/* Destructor */
268
269void
864dbfa3 270Perl_op_free(pTHX_ OP *o)
79072805 271{
27da23d5 272 dVAR;
acb36ea4 273 OPCODE type;
4026c95a 274 PADOFFSET refcnt;
79072805 275
2814eb74 276 if (!o || o->op_static)
79072805
LW		 277 return;
278
7934575e
GS		 279 if (o->op_private & OPpREFCOUNTED) {
280 switch (o->op_type) {
281 case OP_LEAVESUB:
282 case OP_LEAVESUBLV:
283 case OP_LEAVEEVAL:
284 case OP_LEAVE:
285 case OP_SCOPE:
286 case OP_LEAVEWRITE:
287 OP_REFCNT_LOCK;
4026c95a 288 refcnt = OpREFCNT_dec(o);
7934575e 289 OP_REFCNT_UNLOCK;
4026c95a
SH		 290 if (refcnt)
291 return;
7934575e
GS		 292 break;
293 default:
294 break;
295 }
296 }
297
11343788 298 if (o->op_flags & OPf_KIDS) {
6867be6d 299 register OP *kid, *nextkid;
11343788 300 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 301 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 302 op_free(kid);
85e6fe83 303 }
79072805 304 }
acb36ea4
GS		 305 type = o->op_type;
306 if (type == OP_NULL)
eb160463 307 type = (OPCODE)o->op_targ;
acb36ea4
GS		 308
309 /* COP* is not cleared by op_clear() so that we may track line
310 * numbers etc even after null() */
311 if (type == OP_NEXTSTATE || type == OP_SETSTATE || type == OP_DBSTATE)
312 cop_free((COP*)o);
313
314 op_clear(o);
238a4c30 315 FreeOp(o);
4d494880
DM		 316#ifdef DEBUG_LEAKING_SCALARS
317 if (PL_op == o)
318 PL_op = Nullop;
319#endif
acb36ea4 320}
79072805 321
93c66552
DM		 322void
323Perl_op_clear(pTHX_ OP *o)
acb36ea4 324{
13137afc 325
27da23d5 326 dVAR;
11343788 327 switch (o->op_type) {
acb36ea4
GS		 328 case OP_NULL: /* Was holding old type, if any. */
329 case OP_ENTEREVAL: /* Was holding hints. */
acb36ea4 330 o->op_targ = 0;
a0d0e21e 331 break;
a6006777 332 default:
ac4c12e7 333 if (!(o->op_flags & OPf_REF)
0b94c7bb 334 || (PL_check[o->op_type] != MEMBER_TO_FPTR(Perl_ck_ftst)))
a6006777 335 break;
336 /* FALL THROUGH */
463ee0b2 337 case OP_GVSV:
79072805 338 case OP_GV:
a6006777 339 case OP_AELEMFAST:
6a077020
DM		 340 if (! (o->op_type == OP_AELEMFAST && o->op_flags & OPf_SPECIAL)) {
341 /* not an OP_PADAV replacement */
350de78d 342#ifdef USE_ITHREADS
6a077020
DM		 343 if (cPADOPo->op_padix > 0) {
344 /* No GvIN_PAD_off(cGVOPo_gv) here, because other references
345 * may still exist on the pad */
346 pad_swipe(cPADOPo->op_padix, TRUE);
347 cPADOPo->op_padix = 0;
348 }
350de78d 349#else
6a077020
DM		 350 SvREFCNT_dec(cSVOPo->op_sv);
351 cSVOPo->op_sv = Nullsv;
350de78d 352#endif
6a077020 353 }
79072805 354 break;
a1ae71d2 355 case OP_METHOD_NAMED:
79072805 356 case OP_CONST:
11343788 357 SvREFCNT_dec(cSVOPo->op_sv);
acb36ea4 358 cSVOPo->op_sv = Nullsv;
3b1c21fa
AB		 359#ifdef USE_ITHREADS
360 /** Bug #15654
361 Even if op_clear does a pad_free for the target of the op,
6a077020 362 pad_free doesn't actually remove the sv that exists in the pad;
3b1c21fa
AB		 363 instead it lives on. This results in that it could be reused as
364 a target later on when the pad was reallocated.
365 **/
366 if(o->op_targ) {
367 pad_swipe(o->op_targ,1);
368 o->op_targ = 0;
369 }
370#endif
79072805 371 break;
748a9306
LW		 372 case OP_GOTO:
373 case OP_NEXT:
374 case OP_LAST:
375 case OP_REDO:
11343788 376 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 377 break;
378 /* FALL THROUGH */
a0d0e21e 379 case OP_TRANS:
acb36ea4 380 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
a0ed51b3 381 SvREFCNT_dec(cSVOPo->op_sv);
acb36ea4
GS		 382 cSVOPo->op_sv = Nullsv;
383 }
384 else {
a0ed51b3 385 Safefree(cPVOPo->op_pv);
acb36ea4
GS		 386 cPVOPo->op_pv = Nullch;
387 }
a0d0e21e
LW		 388 break;
389 case OP_SUBST:
11343788 390 op_free(cPMOPo->op_pmreplroot);
971a9dd3 391 goto clear_pmop;
748a9306 392 case OP_PUSHRE:
971a9dd3 393#ifdef USE_ITHREADS
ba89bb6e 394 if (INT2PTR(PADOFFSET, cPMOPo->op_pmreplroot)) {
dd2155a4
DM		 395 /* No GvIN_PAD_off here, because other references may still
396 * exist on the pad */
397 pad_swipe(INT2PTR(PADOFFSET, cPMOPo->op_pmreplroot), TRUE);
971a9dd3
GS		 398 }
399#else
400 SvREFCNT_dec((SV*)cPMOPo->op_pmreplroot);
401#endif
402 /* FALL THROUGH */
a0d0e21e 403 case OP_MATCH:
8782bef2 404 case OP_QR:
971a9dd3 405clear_pmop:
cb55de95
JH		 406 {
407 HV *pmstash = PmopSTASH(cPMOPo);
408 if (pmstash && SvREFCNT(pmstash)) {
8d2f4536
NC		 409 MAGIC *mg = mg_find((SV*)pmstash, PERL_MAGIC_symtab);
410 if (mg) {
411 PMOP *pmop = (PMOP*) mg->mg_obj;
412 PMOP *lastpmop = NULL;
413 while (pmop) {
414 if (cPMOPo == pmop) {
415 if (lastpmop)
416 lastpmop->op_pmnext = pmop->op_pmnext;
417 else
418 mg->mg_obj = (SV*) pmop->op_pmnext;
419 break;
420 }
421 lastpmop = pmop;
422 pmop = pmop->op_pmnext;
cb55de95 423 }
cb55de95 424 }
83da49e6 425 }
05ec9bb3 426 PmopSTASH_free(cPMOPo);
cb55de95 427 }
971a9dd3 428 cPMOPo->op_pmreplroot = Nullop;
5f8cb046
DM		 429 /* we use the "SAFE" version of the PM_ macros here
430 * since sv_clean_all might release some PMOPs
431 * after PL_regex_padav has been cleared
432 * and the clearing of PL_regex_padav needs to
433 * happen before sv_clean_all
434 */
435 ReREFCNT_dec(PM_GETRE_SAFE(cPMOPo));
436 PM_SETRE_SAFE(cPMOPo, (REGEXP*)NULL);
13137afc
AB		 437#ifdef USE_ITHREADS
438 if(PL_regex_pad) { /* We could be in destruction */
439 av_push((AV*) PL_regex_pad[0],(SV*) PL_regex_pad[(cPMOPo)->op_pmoffset]);
1cc8b4c5 440 SvREPADTMP_on(PL_regex_pad[(cPMOPo)->op_pmoffset]);
13137afc
AB		 441 PM_SETRE(cPMOPo, (cPMOPo)->op_pmoffset);
442 }
1eb1540c 443#endif
13137afc 444
a0d0e21e 445 break;
79072805
LW		 446 }
447
743e66e6 448 if (o->op_targ > 0) {
11343788 449 pad_free(o->op_targ);
743e66e6
GS		 450 o->op_targ = 0;
451 }
79072805
LW		 452}
453
76e3520e 454STATIC void
3eb57f73
HS		 455S_cop_free(pTHX_ COP* cop)
456{
05ec9bb3
NIS		 457 Safefree(cop->cop_label); /* FIXME: treaddead ??? */
458 CopFILE_free(cop);
459 CopSTASH_free(cop);
0453d815 460 if (! specialWARN(cop->cop_warnings))
3eb57f73 461 SvREFCNT_dec(cop->cop_warnings);
05ec9bb3
NIS		 462 if (! specialCopIO(cop->cop_io)) {
463#ifdef USE_ITHREADS
042f6df8 464#if 0
05ec9bb3
NIS		 465 STRLEN len;
466 char *s = SvPV(cop->cop_io,len);
b178108d
JH		 467 Perl_warn(aTHX_ "io='%.*s'",(int) len,s); /* ??? --jhi */
468#endif
05ec9bb3 469#else
ac27b0f5 470 SvREFCNT_dec(cop->cop_io);
05ec9bb3
NIS		 471#endif
472 }
3eb57f73
HS		 473}
474
93c66552
DM		 475void
476Perl_op_null(pTHX_ OP *o)
8990e307 477{
27da23d5 478 dVAR;
acb36ea4
GS		 479 if (o->op_type == OP_NULL)
480 return;
481 op_clear(o);
11343788
MB		 482 o->op_targ = o->op_type;
483 o->op_type = OP_NULL;
22c35a8c 484 o->op_ppaddr = PL_ppaddr[OP_NULL];
8990e307
LW		 485}
486
4026c95a
SH		 487void
488Perl_op_refcnt_lock(pTHX)
489{
27da23d5 490 dVAR;
4026c95a
SH		 491 OP_REFCNT_LOCK;
492}
493
494void
495Perl_op_refcnt_unlock(pTHX)
496{
27da23d5 497 dVAR;
4026c95a
SH		 498 OP_REFCNT_UNLOCK;
499}
500
79072805
LW		 501/* Contextualizers */
502
463ee0b2 503#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 504
505OP *
864dbfa3 506Perl_linklist(pTHX_ OP *o)
79072805 507{
79072805 508
11343788
MB		 509 if (o->op_next)
510 return o->op_next;
79072805
LW		 511
512 /* establish postfix order */
11343788 513 if (cUNOPo->op_first) {
6867be6d 514 register OP *kid;
11343788
MB		 515 o->op_next = LINKLIST(cUNOPo->op_first);
516 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 517 if (kid->op_sibling)
518 kid->op_next = LINKLIST(kid->op_sibling);
519 else
11343788 520 kid->op_next = o;
79072805
LW		 521 }
522 }
523 else
11343788 524 o->op_next = o;
79072805 525
11343788 526 return o->op_next;
79072805
LW		 527}
528
529OP *
864dbfa3 530Perl_scalarkids(pTHX_ OP *o)
79072805 531{
11343788 532 if (o && o->op_flags & OPf_KIDS) {
bfed75c6 533 OP *kid;
11343788 534 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 535 scalar(kid);
536 }
11343788 537 return o;
79072805
LW		 538}
539
76e3520e 540STATIC OP *
cea2e8a9 541S_scalarboolean(pTHX_ OP *o)
8990e307 542{
d008e5eb 543 if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
d008e5eb 544 if (ckWARN(WARN_SYNTAX)) {
6867be6d 545 const line_t oldline = CopLINE(PL_curcop);
a0d0e21e 546
d008e5eb 547 if (PL_copline != NOLINE)
57843af0 548 CopLINE_set(PL_curcop, PL_copline);
9014280d 549 Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Found = in conditional, should be ==");
57843af0 550 CopLINE_set(PL_curcop, oldline);
d008e5eb 551 }
a0d0e21e 552 }
11343788 553 return scalar(o);
8990e307
LW		 554}
555
556OP *
864dbfa3 557Perl_scalar(pTHX_ OP *o)
79072805 558{
27da23d5 559 dVAR;
79072805
LW		 560 OP *kid;
561
a0d0e21e 562 /* assumes no premature commitment */
3280af22 563 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 564 || o->op_type == OP_RETURN)
7e363e51 565 {
11343788 566 return o;
7e363e51 567 }
79072805 568
5dc0d613 569 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 570
11343788 571 switch (o->op_type) {
79072805 572 case OP_REPEAT:
11343788 573 scalar(cBINOPo->op_first);
8990e307 574 break;
79072805
LW		 575 case OP_OR:
576 case OP_AND:
577 case OP_COND_EXPR:
11343788 578 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 579 scalar(kid);
79072805 580 break;
a0d0e21e 581 case OP_SPLIT:
11343788 582 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e 583 if (!kPMOP->op_pmreplroot)
12bcd1a6 584 deprecate_old("implicit split to @_");
a0d0e21e
LW		 585 }
586 /* FALL THROUGH */
79072805 587 case OP_MATCH:
8782bef2 588 case OP_QR:
79072805
LW		 589 case OP_SUBST:
590 case OP_NULL:
8990e307 591 default:
11343788
MB		 592 if (o->op_flags & OPf_KIDS) {
593 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 594 scalar(kid);
595 }
79072805
LW		 596 break;
597 case OP_LEAVE:
598 case OP_LEAVETRY:
5dc0d613 599 kid = cLISTOPo->op_first;
54310121 600 scalar(kid);
155aba94 601 while ((kid = kid->op_sibling)) {
54310121 602 if (kid->op_sibling)
603 scalarvoid(kid);
604 else
605 scalar(kid);
606 }
3280af22 607 WITH_THR(PL_curcop = &PL_compiling);
54310121 608 break;
748a9306 609 case OP_SCOPE:
79072805 610 case OP_LINESEQ:
8990e307 611 case OP_LIST:
11343788 612 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 613 if (kid->op_sibling)
614 scalarvoid(kid);
615 else
616 scalar(kid);
617 }
3280af22 618 WITH_THR(PL_curcop = &PL_compiling);
79072805 619 break;
a801c63c
RGS		 620 case OP_SORT:
621 if (ckWARN(WARN_VOID))
9014280d 622 Perl_warner(aTHX_ packWARN(WARN_VOID), "Useless use of sort in scalar context");
79072805 623 }
11343788 624 return o;
79072805
LW		 625}
626
627OP *
864dbfa3 628Perl_scalarvoid(pTHX_ OP *o)
79072805 629{
27da23d5 630 dVAR;
79072805 631 OP *kid;
e1ec3a88 632 const char* useless = 0;
8990e307 633 SV* sv;
2ebea0a1
GS		 634 U8 want;
635
acb36ea4
GS		 636 if (o->op_type == OP_NEXTSTATE
637 || o->op_type == OP_SETSTATE
638 || o->op_type == OP_DBSTATE
639 || (o->op_type == OP_NULL && (o->op_targ == OP_NEXTSTATE
640 || o->op_targ == OP_SETSTATE
641 || o->op_targ == OP_DBSTATE)))
2ebea0a1 642 PL_curcop = (COP*)o; /* for warning below */
79072805 643
54310121 644 /* assumes no premature commitment */
2ebea0a1
GS		 645 want = o->op_flags & OPf_WANT;
646 if ((want && want != OPf_WANT_SCALAR) || PL_error_count
5dc0d613 647 || o->op_type == OP_RETURN)
7e363e51 648 {
11343788 649 return o;
7e363e51 650 }
79072805 651
b162f9ea 652 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 653 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
654 {
b162f9ea 655 return scalar(o); /* As if inside SASSIGN */
7e363e51 656 }
1c846c1f 657
5dc0d613 658 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 659
11343788 660 switch (o->op_type) {
79072805 661 default:
22c35a8c 662 if (!(PL_opargs[o->op_type] & OA_FOLDCONST))
8990e307 663 break;
36477c24 664 /* FALL THROUGH */
665 case OP_REPEAT:
11343788 666 if (o->op_flags & OPf_STACKED)
8990e307 667 break;
5d82c453
GA		 668 goto func_ops;
669 case OP_SUBSTR:
670 if (o->op_private == 4)
671 break;
8990e307
LW		 672 /* FALL THROUGH */
673 case OP_GVSV:
674 case OP_WANTARRAY:
675 case OP_GV:
676 case OP_PADSV:
677 case OP_PADAV:
678 case OP_PADHV:
679 case OP_PADANY:
680 case OP_AV2ARYLEN:
8990e307 681 case OP_REF:
a0d0e21e
LW		 682 case OP_REFGEN:
683 case OP_SREFGEN:
8990e307
LW		 684 case OP_DEFINED:
685 case OP_HEX:
686 case OP_OCT:
687 case OP_LENGTH:
8990e307
LW		 688 case OP_VEC:
689 case OP_INDEX:
690 case OP_RINDEX:
691 case OP_SPRINTF:
692 case OP_AELEM:
693 case OP_AELEMFAST:
694 case OP_ASLICE:
8990e307
LW		 695 case OP_HELEM:
696 case OP_HSLICE:
697 case OP_UNPACK:
698 case OP_PACK:
8990e307
LW		 699 case OP_JOIN:
700 case OP_LSLICE:
701 case OP_ANONLIST:
702 case OP_ANONHASH:
703 case OP_SORT:
704 case OP_REVERSE:
705 case OP_RANGE:
706 case OP_FLIP:
707 case OP_FLOP:
708 case OP_CALLER:
709 case OP_FILENO:
710 case OP_EOF:
711 case OP_TELL:
712 case OP_GETSOCKNAME:
713 case OP_GETPEERNAME:
714 case OP_READLINK:
715 case OP_TELLDIR:
716 case OP_GETPPID:
717 case OP_GETPGRP:
718 case OP_GETPRIORITY:
719 case OP_TIME:
720 case OP_TMS:
721 case OP_LOCALTIME:
722 case OP_GMTIME:
723 case OP_GHBYNAME:
724 case OP_GHBYADDR:
725 case OP_GHOSTENT:
726 case OP_GNBYNAME:
727 case OP_GNBYADDR:
728 case OP_GNETENT:
729 case OP_GPBYNAME:
730 case OP_GPBYNUMBER:
731 case OP_GPROTOENT:
732 case OP_GSBYNAME:
733 case OP_GSBYPORT:
734 case OP_GSERVENT:
735 case OP_GPWNAM:
736 case OP_GPWUID:
737 case OP_GGRNAM:
738 case OP_GGRGID:
739 case OP_GETLOGIN:
78e1b766 740 case OP_PROTOTYPE:
5d82c453 741 func_ops:
64aac5a9 742 if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO)))
53e06cf0 743 useless = OP_DESC(o);
8990e307
LW		 744 break;
745
9f82cd5f
YST		 746 case OP_NOT:
747 kid = cUNOPo->op_first;
748 if (kid->op_type != OP_MATCH && kid->op_type != OP_SUBST &&
749 kid->op_type != OP_TRANS) {
750 goto func_ops;
751 }
752 useless = "negative pattern binding (!~)";
753 break;
754
8990e307
LW		 755 case OP_RV2GV:
756 case OP_RV2SV:
757 case OP_RV2AV:
758 case OP_RV2HV:
192587c2 759 if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO)) &&
11343788 760 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 761 useless = "a variable";
762 break;
79072805
LW		 763
764 case OP_CONST:
7766f137 765 sv = cSVOPo_sv;
7a52d87a
GS		 766 if (cSVOPo->op_private & OPpCONST_STRICT)
767 no_bareword_allowed(o);
768 else {
d008e5eb
GS		 769 if (ckWARN(WARN_VOID)) {
770 useless = "a constant";
e7fec78e 771 /* don't warn on optimised away booleans, eg
b5a930ec 772 * use constant Foo, 5; Foo || print; */
e7fec78e
DM		 773 if (cSVOPo->op_private & OPpCONST_SHORTCIRCUIT)
774 useless = 0;
960b4253
MG		 775 /* the constants 0 and 1 are permitted as they are
776 conventionally used as dummies in constructs like
777 1 while some_condition_with_side_effects; */
e7fec78e 778 else if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
d008e5eb
GS		 779 useless = 0;
780 else if (SvPOK(sv)) {
a52fe3ac
A		 781 /* perl4's way of mixing documentation and code
782 (before the invention of POD) was based on a
783 trick to mix nroff and perl code. The trick was
784 built upon these three nroff macros being used in
785 void context. The pink camel has the details in
786 the script wrapman near page 319. */
b15aece3
SP		 787 if (strnEQ(SvPVX_const(sv), "di", 2) ||
788 strnEQ(SvPVX_const(sv), "ds", 2) ||
789 strnEQ(SvPVX_const(sv), "ig", 2))
d008e5eb
GS		 790 useless = 0;
791 }
8990e307
LW		 792 }
793 }
93c66552 794 op_null(o); /* don't execute or even remember it */
79072805
LW		 795 break;
796
797 case OP_POSTINC:
11343788 798 o->op_type = OP_PREINC; /* pre-increment is faster */
22c35a8c 799 o->op_ppaddr = PL_ppaddr[OP_PREINC];
79072805
LW		 800 break;
801
802 case OP_POSTDEC:
11343788 803 o->op_type = OP_PREDEC; /* pre-decrement is faster */
22c35a8c 804 o->op_ppaddr = PL_ppaddr[OP_PREDEC];
79072805
LW		 805 break;
806
79072805
LW		 807 case OP_OR:
808 case OP_AND:
c963b151 809 case OP_DOR:
79072805 810 case OP_COND_EXPR:
11343788 811 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 812 scalarvoid(kid);
813 break;
5aabfad6 814
a0d0e21e 815 case OP_NULL:
11343788 816 if (o->op_flags & OPf_STACKED)
a0d0e21e 817 break;
5aabfad6 818 /* FALL THROUGH */
2ebea0a1
GS		 819 case OP_NEXTSTATE:
820 case OP_DBSTATE:
79072805
LW		 821 case OP_ENTERTRY:
822 case OP_ENTER:
11343788 823 if (!(o->op_flags & OPf_KIDS))
79072805 824 break;
54310121 825 /* FALL THROUGH */
463ee0b2 826 case OP_SCOPE:
79072805
LW		 827 case OP_LEAVE:
828 case OP_LEAVETRY:
a0d0e21e 829 case OP_LEAVELOOP:
79072805 830 case OP_LINESEQ:
79072805 831 case OP_LIST:
11343788 832 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 833 scalarvoid(kid);
834 break;
c90c0ff4 835 case OP_ENTEREVAL:
5196be3e 836 scalarkids(o);
c90c0ff4 837 break;
5aabfad6 838 case OP_REQUIRE:
c90c0ff4 839 /* all requires must return a boolean value */
5196be3e 840 o->op_flags &= ~OPf_WANT;
d6483035
GS		 841 /* FALL THROUGH */
842 case OP_SCALAR:
5196be3e 843 return scalar(o);
a0d0e21e 844 case OP_SPLIT:
11343788 845 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e 846 if (!kPMOP->op_pmreplroot)
12bcd1a6 847 deprecate_old("implicit split to @_");
a0d0e21e
LW		 848 }
849 break;
79072805 850 }
411caa50 851 if (useless && ckWARN(WARN_VOID))
9014280d 852 Perl_warner(aTHX_ packWARN(WARN_VOID), "Useless use of %s in void context", useless);
11343788 853 return o;
79072805
LW		 854}
855
856OP *
864dbfa3 857Perl_listkids(pTHX_ OP *o)
79072805 858{
11343788 859 if (o && o->op_flags & OPf_KIDS) {
6867be6d 860 OP *kid;
11343788 861 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 862 list(kid);
863 }
11343788 864 return o;
79072805
LW		 865}
866
867OP *
864dbfa3 868Perl_list(pTHX_ OP *o)
79072805 869{
27da23d5 870 dVAR;
79072805
LW		 871 OP *kid;
872
a0d0e21e 873 /* assumes no premature commitment */
3280af22 874 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 875 || o->op_type == OP_RETURN)
7e363e51 876 {
11343788 877 return o;
7e363e51 878 }
79072805 879
b162f9ea 880 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 881 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
882 {
b162f9ea 883 return o; /* As if inside SASSIGN */
7e363e51 884 }
1c846c1f 885
5dc0d613 886 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 887
11343788 888 switch (o->op_type) {
79072805
LW		 889 case OP_FLOP:
890 case OP_REPEAT:
11343788 891 list(cBINOPo->op_first);
79072805
LW		 892 break;
893 case OP_OR:
894 case OP_AND:
895 case OP_COND_EXPR:
11343788 896 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 897 list(kid);
898 break;
899 default:
900 case OP_MATCH:
8782bef2 901 case OP_QR:
79072805
LW		 902 case OP_SUBST:
903 case OP_NULL:
11343788 904 if (!(o->op_flags & OPf_KIDS))
79072805 905 break;
11343788
MB		 906 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
907 list(cBINOPo->op_first);
908 return gen_constant_list(o);
79072805
LW		 909 }
910 case OP_LIST:
11343788 911 listkids(o);
79072805
LW		 912 break;
913 case OP_LEAVE:
914 case OP_LEAVETRY:
5dc0d613 915 kid = cLISTOPo->op_first;
54310121 916 list(kid);
155aba94 917 while ((kid = kid->op_sibling)) {
54310121 918 if (kid->op_sibling)
919 scalarvoid(kid);
920 else
921 list(kid);
922 }
3280af22 923 WITH_THR(PL_curcop = &PL_compiling);
54310121 924 break;
748a9306 925 case OP_SCOPE:
79072805 926 case OP_LINESEQ:
11343788 927 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 928 if (kid->op_sibling)
929 scalarvoid(kid);
930 else
931 list(kid);
932 }
3280af22 933 WITH_THR(PL_curcop = &PL_compiling);
79072805 934 break;
c90c0ff4 935 case OP_REQUIRE:
936 /* all requires must return a boolean value */
5196be3e
MB		 937 o->op_flags &= ~OPf_WANT;
938 return scalar(o);
79072805 939 }
11343788 940 return o;
79072805
LW		 941}
942
943OP *
864dbfa3 944Perl_scalarseq(pTHX_ OP *o)
79072805 945{
11343788
MB		 946 if (o) {
947 if (o->op_type == OP_LINESEQ ||
948 o->op_type == OP_SCOPE ||
949 o->op_type == OP_LEAVE ||
950 o->op_type == OP_LEAVETRY)
463ee0b2 951 {
6867be6d 952 OP *kid;
11343788 953 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 954 if (kid->op_sibling) {
463ee0b2 955 scalarvoid(kid);
ed6116ce 956 }
463ee0b2 957 }
3280af22 958 PL_curcop = &PL_compiling;
79072805 959 }
11343788 960 o->op_flags &= ~OPf_PARENS;
3280af22 961 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 962 o->op_flags |= OPf_PARENS;
79072805 963 }
8990e307 964 else
11343788
MB		 965 o = newOP(OP_STUB, 0);
966 return o;
79072805
LW		 967}
968
76e3520e 969STATIC OP *
cea2e8a9 970S_modkids(pTHX_ OP *o, I32 type)
79072805 971{
11343788 972 if (o && o->op_flags & OPf_KIDS) {
6867be6d 973 OP *kid;
11343788 974 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 975 mod(kid, type);
79072805 976 }
11343788 977 return o;
79072805
LW		 978}
979
ddeae0f1
DM		 980/* Propagate lvalue ("modifiable") context to an op and it's children.
981 * 'type' represents the context type, roughly based on the type of op that
982 * would do the modifying, although local() is represented by OP_NULL.
983 * It's responsible for detecting things that can't be modified, flag
984 * things that need to behave specially in an lvalue context (e.g., "$$x = 5"
985 * might have to vivify a reference in $x), and so on.
986 *
987 * For example, "$a+1 = 2" would cause mod() to be called with o being
988 * OP_ADD and type being OP_SASSIGN, and would output an error.
989 */
990
79072805 991OP *
864dbfa3 992Perl_mod(pTHX_ OP *o, I32 type)
79072805 993{
27da23d5 994 dVAR;
79072805 995 OP *kid;
ddeae0f1
DM		 996 /* -1 = error on localize, 0 = ignore localize, 1 = ok to localize */
997 int localize = -1;
79072805 998
3280af22 999 if (!o || PL_error_count)
11343788 1000 return o;
79072805 1001
b162f9ea 1002 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 1003 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
1004 {
b162f9ea 1005 return o;
7e363e51 1006 }
1c846c1f 1007
11343788 1008 switch (o->op_type) {
68dc0745 1009 case OP_UNDEF:
ddeae0f1 1010 localize = 0;
3280af22 1011 PL_modcount++;
5dc0d613 1012 return o;
a0d0e21e 1013 case OP_CONST:
11343788 1014 if (!(o->op_private & (OPpCONST_ARYBASE)))
a0d0e21e 1015 goto nomod;
3280af22 1016 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
7766f137 1017 PL_compiling.cop_arybase = (I32)SvIV(cSVOPx(PL_eval_start)->op_sv);
3280af22 1018 PL_eval_start = 0;
a0d0e21e
LW		 1019 }
1020 else if (!type) {
3280af22
NIS		 1021 SAVEI32(PL_compiling.cop_arybase);
1022 PL_compiling.cop_arybase = 0;
a0d0e21e
LW		 1023 }
1024 else if (type == OP_REFGEN)
1025 goto nomod;
1026 else
cea2e8a9 1027 Perl_croak(aTHX_ "That use of $[ is unsupported");
a0d0e21e 1028 break;
5f05dabc 1029 case OP_STUB:
5196be3e 1030 if (o->op_flags & OPf_PARENS)
5f05dabc 1031 break;
1032 goto nomod;
a0d0e21e
LW		 1033 case OP_ENTERSUB:
1034 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1035 !(o->op_flags & OPf_STACKED)) {
1036 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1037 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788 1038 assert(cUNOPo->op_first->op_type == OP_NULL);
93c66552 1039 op_null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1040 break;
1041 }
95f0a2f1
SB		 1042 else if (o->op_private & OPpENTERSUB_NOMOD)
1043 return o;
cd06dffe
GS		 1044 else { /* lvalue subroutine call */
1045 o->op_private |= OPpLVAL_INTRO;
e6438c1a 1046 PL_modcount = RETURN_UNLIMITED_NUMBER;
4978d6d9 1047 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN) {
cd06dffe
GS		 1048 /* Backward compatibility mode: */
1049 o->op_private |= OPpENTERSUB_INARGS;
1050 break;
1051 }
1052 else { /* Compile-time error message: */
1053 OP *kid = cUNOPo->op_first;
1054 CV *cv;
1055 OP *okid;
1056
1057 if (kid->op_type == OP_PUSHMARK)
1058 goto skip_kids;
1059 if (kid->op_type != OP_NULL || kid->op_targ != OP_LIST)
1060 Perl_croak(aTHX_
1061 "panic: unexpected lvalue entersub "
55140b79 1062 "args: type/targ %ld:%"UVuf,
3d811634 1063 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1064 kid = kLISTOP->op_first;
1065 skip_kids:
1066 while (kid->op_sibling)
1067 kid = kid->op_sibling;
1068 if (!(kid->op_type == OP_NULL && kid->op_targ == OP_RV2CV)) {
1069 /* Indirect call */
1070 if (kid->op_type == OP_METHOD_NAMED
1071 || kid->op_type == OP_METHOD)
1072 {
87d7fd28 1073 UNOP *newop;
b2ffa427 1074
87d7fd28 1075 NewOp(1101, newop, 1, UNOP);
349fd7b7
GS		 1076 newop->op_type = OP_RV2CV;
1077 newop->op_ppaddr = PL_ppaddr[OP_RV2CV];
87d7fd28
GS		 1078 newop->op_first = Nullop;
1079 newop->op_next = (OP*)newop;
1080 kid->op_sibling = (OP*)newop;
349fd7b7 1081 newop->op_private |= OPpLVAL_INTRO;
cd06dffe
GS		 1082 break;
1083 }
b2ffa427 1084
cd06dffe
GS		 1085 if (kid->op_type != OP_RV2CV)
1086 Perl_croak(aTHX_
1087 "panic: unexpected lvalue entersub "
55140b79 1088 "entry via type/targ %ld:%"UVuf,
3d811634 1089 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1090 kid->op_private |= OPpLVAL_INTRO;
1091 break; /* Postpone until runtime */
1092 }
b2ffa427
NIS		 1093
1094 okid = kid;
cd06dffe
GS		 1095 kid = kUNOP->op_first;
1096 if (kid->op_type == OP_NULL && kid->op_targ == OP_RV2SV)
1097 kid = kUNOP->op_first;
b2ffa427 1098 if (kid->op_type == OP_NULL)
cd06dffe
GS		 1099 Perl_croak(aTHX_
1100 "Unexpected constant lvalue entersub "
55140b79 1101 "entry via type/targ %ld:%"UVuf,
3d811634 1102 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1103 if (kid->op_type != OP_GV) {
1104 /* Restore RV2CV to check lvalueness */
1105 restore_2cv:
1106 if (kid->op_next && kid->op_next != kid) { /* Happens? */
1107 okid->op_next = kid->op_next;
1108 kid->op_next = okid;
1109 }
1110 else
1111 okid->op_next = Nullop;
1112 okid->op_type = OP_RV2CV;
1113 okid->op_targ = 0;
1114 okid->op_ppaddr = PL_ppaddr[OP_RV2CV];
1115 okid->op_private |= OPpLVAL_INTRO;
1116 break;
1117 }
b2ffa427 1118
638eceb6 1119 cv = GvCV(kGVOP_gv);
1c846c1f 1120 if (!cv)
cd06dffe
GS		 1121 goto restore_2cv;
1122 if (CvLVALUE(cv))
1123 break;
1124 }
1125 }
79072805
LW		 1126 /* FALL THROUGH */
1127 default:
a0d0e21e
LW		 1128 nomod:
1129 /* grep, foreach, subcalls, refgen */
1130 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
1131 break;
cea2e8a9 1132 yyerror(Perl_form(aTHX_ "Can't modify %s in %s",
638bc118 1133 (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
cd06dffe
GS		 1134 ? "do block"
1135 : (o->op_type == OP_ENTERSUB
1136 ? "non-lvalue subroutine call"
53e06cf0 1137 : OP_DESC(o))),
22c35a8c 1138 type ? PL_op_desc[type] : "local"));
11343788 1139 return o;
79072805 1140
a0d0e21e
LW		 1141 case OP_PREINC:
1142 case OP_PREDEC:
1143 case OP_POW:
1144 case OP_MULTIPLY:
1145 case OP_DIVIDE:
1146 case OP_MODULO:
1147 case OP_REPEAT:
1148 case OP_ADD:
1149 case OP_SUBTRACT:
1150 case OP_CONCAT:
1151 case OP_LEFT_SHIFT:
1152 case OP_RIGHT_SHIFT:
1153 case OP_BIT_AND:
1154 case OP_BIT_XOR:
1155 case OP_BIT_OR:
1156 case OP_I_MULTIPLY:
1157 case OP_I_DIVIDE:
1158 case OP_I_MODULO:
1159 case OP_I_ADD:
1160 case OP_I_SUBTRACT:
11343788 1161 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1162 goto nomod;
3280af22 1163 PL_modcount++;
a0d0e21e 1164 break;
b2ffa427 1165
79072805 1166 case OP_COND_EXPR:
ddeae0f1 1167 localize = 1;
11343788 1168 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1169 mod(kid, type);
79072805
LW		 1170 break;
1171
1172 case OP_RV2AV:
1173 case OP_RV2HV:
11343788 1174 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
e6438c1a 1175 PL_modcount = RETURN_UNLIMITED_NUMBER;
11343788 1176 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1177 }
1178 /* FALL THROUGH */
79072805 1179 case OP_RV2GV:
5dc0d613 1180 if (scalar_mod_type(o, type))
3fe9a6f1 1181 goto nomod;
11343788 1182 ref(cUNOPo->op_first, o->op_type);
79072805 1183 /* FALL THROUGH */
79072805
LW		 1184 case OP_ASLICE:
1185 case OP_HSLICE:
78f9721b
SM		 1186 if (type == OP_LEAVESUBLV)
1187 o->op_private |= OPpMAYBE_LVSUB;
ddeae0f1 1188 localize = 1;
78f9721b
SM		 1189 /* FALL THROUGH */
1190 case OP_AASSIGN:
93a17b20
LW		 1191 case OP_NEXTSTATE:
1192 case OP_DBSTATE:
e6438c1a 1193 PL_modcount = RETURN_UNLIMITED_NUMBER;
79072805 1194 break;
463ee0b2 1195 case OP_RV2SV:
aeea060c 1196 ref(cUNOPo->op_first, o->op_type);
ddeae0f1 1197 localize = 1;
463ee0b2 1198 /* FALL THROUGH */
79072805 1199 case OP_GV:
463ee0b2 1200 case OP_AV2ARYLEN:
3280af22 1201 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1202 case OP_SASSIGN:
bf4b1e52
GS		 1203 case OP_ANDASSIGN:
1204 case OP_ORASSIGN:
c963b151 1205 case OP_DORASSIGN:
ddeae0f1
DM		 1206 PL_modcount++;
1207 break;
1208
8990e307 1209 case OP_AELEMFAST:
6a077020 1210 localize = -1;
3280af22 1211 PL_modcount++;
8990e307
LW		 1212 break;
1213
748a9306
LW		 1214 case OP_PADAV:
1215 case OP_PADHV:
e6438c1a 1216 PL_modcount = RETURN_UNLIMITED_NUMBER;
5196be3e
MB		 1217 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1218 return o; /* Treat \(@foo) like ordinary list. */
1219 if (scalar_mod_type(o, type))
3fe9a6f1 1220 goto nomod;
78f9721b
SM		 1221 if (type == OP_LEAVESUBLV)
1222 o->op_private |= OPpMAYBE_LVSUB;
748a9306
LW		 1223 /* FALL THROUGH */
1224 case OP_PADSV:
3280af22 1225 PL_modcount++;
ddeae0f1 1226 if (!type) /* local() */
cea2e8a9 1227 Perl_croak(aTHX_ "Can't localize lexical variable %s",
dd2155a4 1228 PAD_COMPNAME_PV(o->op_targ));
463ee0b2
LW		 1229 break;
1230
748a9306 1231 case OP_PUSHMARK:
ddeae0f1 1232 localize = 0;
748a9306 1233 break;
b2ffa427 1234
69969c6f
SB		 1235 case OP_KEYS:
1236 if (type != OP_SASSIGN)
1237 goto nomod;
5d82c453
GA		 1238 goto lvalue_func;
1239 case OP_SUBSTR:
1240 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1241 goto nomod;
5f05dabc 1242 /* FALL THROUGH */
a0d0e21e 1243 case OP_POS:
463ee0b2 1244 case OP_VEC:
78f9721b
SM		 1245 if (type == OP_LEAVESUBLV)
1246 o->op_private |= OPpMAYBE_LVSUB;
5d82c453 1247 lvalue_func:
11343788
MB		 1248 pad_free(o->op_targ);
1249 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1250 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1251 if (o->op_flags & OPf_KIDS)
1252 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1253 break;
a0d0e21e 1254
463ee0b2
LW		 1255 case OP_AELEM:
1256 case OP_HELEM:
11343788 1257 ref(cBINOPo->op_first, o->op_type);
68dc0745 1258 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1259 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1260 o->op_private |= OPpLVAL_DEFER;
78f9721b
SM		 1261 if (type == OP_LEAVESUBLV)
1262 o->op_private |= OPpMAYBE_LVSUB;
ddeae0f1 1263 localize = 1;
3280af22 1264 PL_modcount++;
463ee0b2
LW		 1265 break;
1266
1267 case OP_SCOPE:
1268 case OP_LEAVE:
1269 case OP_ENTER:
78f9721b 1270 case OP_LINESEQ:
ddeae0f1 1271 localize = 0;
11343788
MB		 1272 if (o->op_flags & OPf_KIDS)
1273 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1274 break;
1275
1276 case OP_NULL:
ddeae0f1 1277 localize = 0;
638bc118
GS		 1278 if (o->op_flags & OPf_SPECIAL) /* do BLOCK */
1279 goto nomod;
1280 else if (!(o->op_flags & OPf_KIDS))
463ee0b2 1281 break;
11343788
MB		 1282 if (o->op_targ != OP_LIST) {
1283 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1284 break;
1285 }
1286 /* FALL THROUGH */
463ee0b2 1287 case OP_LIST:
ddeae0f1 1288 localize = 0;
11343788 1289 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1290 mod(kid, type);
1291 break;
78f9721b
SM		 1292
1293 case OP_RETURN:
1294 if (type != OP_LEAVESUBLV)
1295 goto nomod;
1296 break; /* mod()ing was handled by ck_return() */
463ee0b2 1297 }
58d95175 1298
8be1be90
AMS		 1299 /* [20011101.069] File test operators interpret OPf_REF to mean that
1300 their argument is a filehandle; thus \stat(".") should not set
1301 it. AMS 20011102 */
1302 if (type == OP_REFGEN &&
1303 PL_check[o->op_type] == MEMBER_TO_FPTR(Perl_ck_ftst))
1304 return o;
1305
1306 if (type != OP_LEAVESUBLV)
1307 o->op_flags |= OPf_MOD;
1308
1309 if (type == OP_AASSIGN || type == OP_SASSIGN)
1310 o->op_flags |= OPf_SPECIAL|OPf_REF;
ddeae0f1
DM		 1311 else if (!type) { /* local() */
1312 switch (localize) {
1313 case 1:
1314 o->op_private |= OPpLVAL_INTRO;
1315 o->op_flags &= ~OPf_SPECIAL;
1316 PL_hints |= HINT_BLOCK_SCOPE;
1317 break;
1318 case 0:
1319 break;
1320 case -1:
1321 if (ckWARN(WARN_SYNTAX)) {
1322 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
1323 "Useless localization of %s", OP_DESC(o));
1324 }
1325 }
463ee0b2 1326 }
8be1be90
AMS		 1327 else if (type != OP_GREPSTART && type != OP_ENTERSUB
1328 && type != OP_LEAVESUBLV)
1329 o->op_flags |= OPf_REF;
11343788 1330 return o;
463ee0b2
LW		 1331}
1332
864dbfa3 1333STATIC bool
6867be6d 1334S_scalar_mod_type(pTHX_ const OP *o, I32 type)
3fe9a6f1 1335{
1336 switch (type) {
1337 case OP_SASSIGN:
5196be3e 1338 if (o->op_type == OP_RV2GV)
3fe9a6f1 1339 return FALSE;
1340 /* FALL THROUGH */
1341 case OP_PREINC:
1342 case OP_PREDEC:
1343 case OP_POSTINC:
1344 case OP_POSTDEC:
1345 case OP_I_PREINC:
1346 case OP_I_PREDEC:
1347 case OP_I_POSTINC:
1348 case OP_I_POSTDEC:
1349 case OP_POW:
1350 case OP_MULTIPLY:
1351 case OP_DIVIDE:
1352 case OP_MODULO:
1353 case OP_REPEAT:
1354 case OP_ADD:
1355 case OP_SUBTRACT:
1356 case OP_I_MULTIPLY:
1357 case OP_I_DIVIDE:
1358 case OP_I_MODULO:
1359 case OP_I_ADD:
1360 case OP_I_SUBTRACT:
1361 case OP_LEFT_SHIFT:
1362 case OP_RIGHT_SHIFT:
1363 case OP_BIT_AND:
1364 case OP_BIT_XOR:
1365 case OP_BIT_OR:
1366 case OP_CONCAT:
1367 case OP_SUBST:
1368 case OP_TRANS:
49e9fbe6
GS		 1369 case OP_READ:
1370 case OP_SYSREAD:
1371 case OP_RECV:
bf4b1e52
GS		 1372 case OP_ANDASSIGN:
1373 case OP_ORASSIGN:
3fe9a6f1 1374 return TRUE;
1375 default:
1376 return FALSE;
1377 }
1378}
1379
35cd451c 1380STATIC bool
504618e9 1381S_is_handle_constructor(pTHX_ const OP *o, I32 numargs)
35cd451c
GS		 1382{
1383 switch (o->op_type) {
1384 case OP_PIPE_OP:
1385 case OP_SOCKPAIR:
504618e9 1386 if (numargs == 2)
35cd451c
GS		 1387 return TRUE;
1388 /* FALL THROUGH */
1389 case OP_SYSOPEN:
1390 case OP_OPEN:
ded8aa31 1391 case OP_SELECT: /* XXX c.f. SelectSaver.pm */
35cd451c
GS		 1392 case OP_SOCKET:
1393 case OP_OPEN_DIR:
1394 case OP_ACCEPT:
504618e9 1395 if (numargs == 1)
35cd451c
GS		 1396 return TRUE;
1397 /* FALL THROUGH */
1398 default:
1399 return FALSE;
1400 }
1401}
1402
463ee0b2 1403OP *
864dbfa3 1404Perl_refkids(pTHX_ OP *o, I32 type)
463ee0b2 1405{
11343788 1406 if (o && o->op_flags & OPf_KIDS) {
6867be6d 1407 OP *kid;
11343788 1408 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1409 ref(kid, type);
1410 }
11343788 1411 return o;
463ee0b2
LW		 1412}
1413
1414OP *
864dbfa3 1415Perl_ref(pTHX_ OP *o, I32 type)
463ee0b2 1416{
27da23d5 1417 dVAR;
463ee0b2 1418 OP *kid;
463ee0b2 1419
3280af22 1420 if (!o || PL_error_count)
11343788 1421 return o;
463ee0b2 1422
11343788 1423 switch (o->op_type) {
a0d0e21e 1424 case OP_ENTERSUB:
afebc493 1425 if ((type == OP_EXISTS || type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1426 !(o->op_flags & OPf_STACKED)) {
1427 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1428 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788 1429 assert(cUNOPo->op_first->op_type == OP_NULL);
93c66552 1430 op_null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
11343788 1431 o->op_flags |= OPf_SPECIAL;
8990e307
LW		 1432 }
1433 break;
aeea060c 1434
463ee0b2 1435 case OP_COND_EXPR:
11343788 1436 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2
LW		 1437 ref(kid, type);
1438 break;
8990e307 1439 case OP_RV2SV:
35cd451c
GS		 1440 if (type == OP_DEFINED)
1441 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1442 ref(cUNOPo->op_first, o->op_type);
4633a7c4
LW		 1443 /* FALL THROUGH */
1444 case OP_PADSV:
5f05dabc 1445 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1446 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1447 : type == OP_RV2HV ? OPpDEREF_HV
1448 : OPpDEREF_SV);
11343788 1449 o->op_flags |= OPf_MOD;
a0d0e21e 1450 }
8990e307 1451 break;
1c846c1f 1452
2faa37cc 1453 case OP_THREADSV:
a863c7d1
MB		 1454 o->op_flags |= OPf_MOD; /* XXX ??? */
1455 break;
1456
463ee0b2
LW		 1457 case OP_RV2AV:
1458 case OP_RV2HV:
aeea060c 1459 o->op_flags |= OPf_REF;
8990e307 1460 /* FALL THROUGH */
463ee0b2 1461 case OP_RV2GV:
35cd451c
GS		 1462 if (type == OP_DEFINED)
1463 o->op_flags |= OPf_SPECIAL; /* don't create GV */
11343788 1464 ref(cUNOPo->op_first, o->op_type);
463ee0b2 1465 break;
8990e307 1466
463ee0b2
LW		 1467 case OP_PADAV:
1468 case OP_PADHV:
aeea060c 1469 o->op_flags |= OPf_REF;
79072805 1470 break;
aeea060c 1471
8990e307 1472 case OP_SCALAR:
79072805 1473 case OP_NULL:
11343788 1474 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1475 break;
11343788 1476 ref(cBINOPo->op_first, type);
79072805
LW		 1477 break;
1478 case OP_AELEM:
1479 case OP_HELEM:
11343788 1480 ref(cBINOPo->op_first, o->op_type);
5f05dabc 1481 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1482 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1483 : type == OP_RV2HV ? OPpDEREF_HV
1484 : OPpDEREF_SV);
11343788 1485 o->op_flags |= OPf_MOD;
8990e307 1486 }
79072805
LW		 1487 break;
1488
463ee0b2 1489 case OP_SCOPE:
79072805
LW		 1490 case OP_LEAVE:
1491 case OP_ENTER:
8990e307 1492 case OP_LIST:
11343788 1493 if (!(o->op_flags & OPf_KIDS))
79072805 1494 break;
11343788 1495 ref(cLISTOPo->op_last, type);
79072805 1496 break;
a0d0e21e
LW		 1497 default:
1498 break;
79072805 1499 }
11343788 1500 return scalar(o);
8990e307 1501
79072805
LW		 1502}
1503
09bef843
SB		 1504STATIC OP *
1505S_dup_attrlist(pTHX_ OP *o)
1506{
1507 OP *rop = Nullop;
1508
1509 /* An attrlist is either a simple OP_CONST or an OP_LIST with kids,
1510 * where the first kid is OP_PUSHMARK and the remaining ones
1511 * are OP_CONST. We need to push the OP_CONST values.
1512 */
1513 if (o->op_type == OP_CONST)
1514 rop = newSVOP(OP_CONST, o->op_flags, SvREFCNT_inc(cSVOPo->op_sv));
1515 else {
1516 assert((o->op_type == OP_LIST) && (o->op_flags & OPf_KIDS));
1517 for (o = cLISTOPo->op_first; o; o=o->op_sibling) {
1518 if (o->op_type == OP_CONST)
1519 rop = append_elem(OP_LIST, rop,
1520 newSVOP(OP_CONST, o->op_flags,
1521 SvREFCNT_inc(cSVOPo->op_sv)));
1522 }
1523 }
1524 return rop;
1525}
1526
1527STATIC void
95f0a2f1 1528S_apply_attrs(pTHX_ HV *stash, SV *target, OP *attrs, bool for_my)
09bef843 1529{
27da23d5 1530 dVAR;
09bef843
SB		 1531 SV *stashsv;
1532
1533 /* fake up C<use attributes $pkg,$rv,@attrs> */
1534 ENTER; /* need to protect against side-effects of 'use' */
1535 SAVEINT(PL_expect);
5aaec2b4 1536 stashsv = stash ? newSVhek(HvNAME_HEK(stash)) : &PL_sv_no;
e4783991 1537
09bef843 1538#define ATTRSMODULE "attributes"
95f0a2f1
SB		 1539#define ATTRSMODULE_PM "attributes.pm"
1540
1541 if (for_my) {
95f0a2f1 1542 /* Don't force the C<use> if we don't need it. */
504618e9 1543 SV **svp = hv_fetch(GvHVn(PL_incgv), ATTRSMODULE_PM,
95f0a2f1
SB		 1544 sizeof(ATTRSMODULE_PM)-1, 0);
1545 if (svp && *svp != &PL_sv_undef)
1546 ; /* already in %INC */
1547 else
1548 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
1549 newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1),
1550 Nullsv);
1551 }
1552 else {
1553 Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS,
1554 newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1),
1555 Nullsv,
1556 prepend_elem(OP_LIST,
1557 newSVOP(OP_CONST, 0, stashsv),
1558 prepend_elem(OP_LIST,
1559 newSVOP(OP_CONST, 0,
1560 newRV(target)),
1561 dup_attrlist(attrs))));
1562 }
09bef843
SB		 1563 LEAVE;
1564}
1565
95f0a2f1
SB		 1566STATIC void
1567S_apply_attrs_my(pTHX_ HV *stash, OP *target, OP *attrs, OP **imopsp)
1568{
1569 OP *pack, *imop, *arg;
1570 SV *meth, *stashsv;
1571
1572 if (!attrs)
1573 return;
1574
1575 assert(target->op_type == OP_PADSV ||
1576 target->op_type == OP_PADHV ||
1577 target->op_type == OP_PADAV);
1578
1579 /* Ensure that attributes.pm is loaded. */
dd2155a4 1580 apply_attrs(stash, PAD_SV(target->op_targ), attrs, TRUE);
95f0a2f1
SB		 1581
1582 /* Need package name for method call. */
1583 pack = newSVOP(OP_CONST, 0, newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1));
1584
1585 /* Build up the real arg-list. */
5aaec2b4
NC		 1586 stashsv = stash ? newSVhek(HvNAME_HEK(stash)) : &PL_sv_no;
1587
95f0a2f1
SB		 1588 arg = newOP(OP_PADSV, 0);
1589 arg->op_targ = target->op_targ;
1590 arg = prepend_elem(OP_LIST,
1591 newSVOP(OP_CONST, 0, stashsv),
1592 prepend_elem(OP_LIST,
1593 newUNOP(OP_REFGEN, 0,
1594 mod(arg, OP_REFGEN)),
1595 dup_attrlist(attrs)));
1596
1597 /* Fake up a method call to import */
427d62a4 1598 meth = newSVpvn_share("import", 6, 0);
95f0a2f1
SB		 1599 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL|OPf_WANT_VOID,
1600 append_elem(OP_LIST,
1601 prepend_elem(OP_LIST, pack, list(arg)),
1602 newSVOP(OP_METHOD_NAMED, 0, meth)));
1603 imop->op_private |= OPpENTERSUB_NOMOD;
1604
1605 /* Combine the ops. */
1606 *imopsp = append_elem(OP_LIST, *imopsp, imop);
1607}
1608
1609/*
1610=notfor apidoc apply_attrs_string
1611
1612Attempts to apply a list of attributes specified by the C<attrstr> and
1613C<len> arguments to the subroutine identified by the C<cv> argument which
1614is expected to be associated with the package identified by the C<stashpv>
1615argument (see L<attributes>). It gets this wrong, though, in that it
1616does not correctly identify the boundaries of the individual attribute
1617specifications within C<attrstr>. This is not really intended for the
1618public API, but has to be listed here for systems such as AIX which
1619need an explicit export list for symbols. (It's called from XS code
1620in support of the C<ATTRS:> keyword from F<xsubpp>.) Patches to fix it
1621to respect attribute syntax properly would be welcome.
1622
1623=cut
1624*/
1625
be3174d2 1626void
6867be6d
AL		 1627Perl_apply_attrs_string(pTHX_ const char *stashpv, CV *cv,
1628 const char *attrstr, STRLEN len)
be3174d2
GS		 1629{
1630 OP *attrs = Nullop;
1631
1632 if (!len) {
1633 len = strlen(attrstr);
1634 }
1635
1636 while (len) {
1637 for (; isSPACE(*attrstr) && len; --len, ++attrstr) ;
1638 if (len) {
890ce7af 1639 const char * const sstr = attrstr;
be3174d2
GS		 1640 for (; !isSPACE(*attrstr) && len; --len, ++attrstr) ;
1641 attrs = append_elem(OP_LIST, attrs,
1642 newSVOP(OP_CONST, 0,
1643 newSVpvn(sstr, attrstr-sstr)));
1644 }
1645 }
1646
1647 Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS,
1648 newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1),
1649 Nullsv, prepend_elem(OP_LIST,
1650 newSVOP(OP_CONST, 0, newSVpv(stashpv,0)),
1651 prepend_elem(OP_LIST,
1652 newSVOP(OP_CONST, 0,
1653 newRV((SV*)cv)),
1654 attrs)));
1655}
1656
09bef843 1657STATIC OP *
95f0a2f1 1658S_my_kid(pTHX_ OP *o, OP *attrs, OP **imopsp)
93a17b20 1659{
93a17b20
LW		 1660 I32 type;
1661
3280af22 1662 if (!o || PL_error_count)
11343788 1663 return o;
93a17b20 1664
11343788 1665 type = o->op_type;
93a17b20 1666 if (type == OP_LIST) {
6867be6d 1667 OP *kid;
11343788 1668 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
95f0a2f1 1669 my_kid(kid, attrs, imopsp);
dab48698 1670 } else if (type == OP_UNDEF) {
7766148a 1671 return o;
77ca0c92
LW		 1672 } else if (type == OP_RV2SV || /* "our" declaration */
1673 type == OP_RV2AV ||
1674 type == OP_RV2HV) { /* XXX does this let anything illegal in? */
1ce0b88c
RGS		 1675 if (cUNOPo->op_first->op_type != OP_GV) { /* MJD 20011224 */
1676 yyerror(Perl_form(aTHX_ "Can't declare %s in %s",
1677 OP_DESC(o), PL_in_my == KEY_our ? "our" : "my"));
1678 } else if (attrs) {
1679 GV *gv = cGVOPx_gv(cUNOPo->op_first);
1680 PL_in_my = FALSE;
1681 PL_in_my_stash = Nullhv;
1682 apply_attrs(GvSTASH(gv),
1683 (type == OP_RV2SV ? GvSV(gv) :
1684 type == OP_RV2AV ? (SV*)GvAV(gv) :
1685 type == OP_RV2HV ? (SV*)GvHV(gv) : (SV*)gv),
1686 attrs, FALSE);
1687 }
192587c2 1688 o->op_private |= OPpOUR_INTRO;
77ca0c92 1689 return o;
95f0a2f1
SB		 1690 }
1691 else if (type != OP_PADSV &&
93a17b20
LW		 1692 type != OP_PADAV &&
1693 type != OP_PADHV &&
1694 type != OP_PUSHMARK)
1695 {
eb64745e 1696 yyerror(Perl_form(aTHX_ "Can't declare %s in \"%s\"",
53e06cf0 1697 OP_DESC(o),
eb64745e 1698 PL_in_my == KEY_our ? "our" : "my"));
11343788 1699 return o;
93a17b20 1700 }
09bef843
SB		 1701 else if (attrs && type != OP_PUSHMARK) {
1702 HV *stash;
09bef843 1703
eb64745e
GS		 1704 PL_in_my = FALSE;
1705 PL_in_my_stash = Nullhv;
1706
09bef843 1707 /* check for C<my Dog $spot> when deciding package */
dd2155a4
DM		 1708 stash = PAD_COMPNAME_TYPE(o->op_targ);
1709 if (!stash)
09bef843 1710 stash = PL_curstash;
95f0a2f1 1711 apply_attrs_my(stash, o, attrs, imopsp);
09bef843 1712 }
11343788
MB		 1713 o->op_flags |= OPf_MOD;
1714 o->op_private |= OPpLVAL_INTRO;
1715 return o;
93a17b20
LW		 1716}
1717
1718OP *
09bef843
SB		 1719Perl_my_attrs(pTHX_ OP *o, OP *attrs)
1720{
95f0a2f1
SB		 1721 OP *rops = Nullop;
1722 int maybe_scalar = 0;
1723
d2be0de5 1724/* [perl #17376]: this appears to be premature, and results in code such as
c754c3d7 1725 C< our(%x); > executing in list mode rather than void mode */
d2be0de5 1726#if 0
09bef843
SB		 1727 if (o->op_flags & OPf_PARENS)
1728 list(o);
95f0a2f1
SB		 1729 else
1730 maybe_scalar = 1;
d2be0de5
YST		 1731#else
1732 maybe_scalar = 1;
1733#endif
09bef843
SB		 1734 if (attrs)
1735 SAVEFREEOP(attrs);
95f0a2f1
SB		 1736 o = my_kid(o, attrs, &rops);
1737 if (rops) {
1738 if (maybe_scalar && o->op_type == OP_PADSV) {
1739 o = scalar(append_list(OP_LIST, (LISTOP*)rops, (LISTOP*)o));
1740 o->op_private |= OPpLVAL_INTRO;
1741 }
1742 else
1743 o = append_list(OP_LIST, (LISTOP*)o, (LISTOP*)rops);
1744 }
eb64745e
GS		 1745 PL_in_my = FALSE;
1746 PL_in_my_stash = Nullhv;
1747 return o;
09bef843
SB		 1748}
1749
1750OP *
1751Perl_my(pTHX_ OP *o)
1752{
95f0a2f1 1753 return my_attrs(o, Nullop);
09bef843
SB		 1754}
1755
1756OP *
864dbfa3 1757Perl_sawparens(pTHX_ OP *o)
79072805
LW		 1758{
1759 if (o)
1760 o->op_flags |= OPf_PARENS;
1761 return o;
1762}
1763
1764OP *
864dbfa3 1765Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
79072805 1766{
11343788 1767 OP *o;
59f00321 1768 bool ismatchop = 0;
79072805 1769
041457d9 1770 if ( (left->op_type == OP_RV2AV ||
599cee73
PM		 1771 left->op_type == OP_RV2HV ||
1772 left->op_type == OP_PADAV ||
041457d9
DM		 1773 left->op_type == OP_PADHV)
1774 && ckWARN(WARN_MISC))
1775 {
e1ec3a88 1776 const char *desc = PL_op_desc[(right->op_type == OP_SUBST ||
599cee73
PM		 1777 right->op_type == OP_TRANS)
1778 ? right->op_type : OP_MATCH];
dff6d3cd
GS		 1779 const char *sample = ((left->op_type == OP_RV2AV ||
1780 left->op_type == OP_PADAV)
1781 ? "@array" : "%hash");
9014280d 1782 Perl_warner(aTHX_ packWARN(WARN_MISC),
1c846c1f 1783 "Applying %s to %s will act on scalar(%s)",
599cee73 1784 desc, sample, sample);
2ae324a7 1785 }
1786
5cc9e5c9
RH		 1787 if (right->op_type == OP_CONST &&
1788 cSVOPx(right)->op_private & OPpCONST_BARE &&
1789 cSVOPx(right)->op_private & OPpCONST_STRICT)
1790 {
1791 no_bareword_allowed(right);
1792 }
1793
59f00321
RGS		 1794 ismatchop = right->op_type == OP_MATCH ||
1795 right->op_type == OP_SUBST ||
1796 right->op_type == OP_TRANS;
1797 if (ismatchop && right->op_private & OPpTARGET_MY) {
1798 right->op_targ = 0;
1799 right->op_private &= ~OPpTARGET_MY;
1800 }
1801 if (!(right->op_flags & OPf_STACKED) && ismatchop) {
79072805 1802 right->op_flags |= OPf_STACKED;
18808301
JH		 1803 if (right->op_type != OP_MATCH &&
1804 ! (right->op_type == OP_TRANS &&
1805 right->op_private & OPpTRANS_IDENTICAL))
463ee0b2 1806 left = mod(left, right->op_type);
79072805 1807 if (right->op_type == OP_TRANS)
11343788 1808 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1809 else
11343788 1810 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1811 if (type == OP_NOT)
11343788
MB		 1812 return newUNOP(OP_NOT, 0, scalar(o));
1813 return o;
79072805
LW		 1814 }
1815 else
1816 return bind_match(type, left,
131b3ad0 1817 pmruntime(newPMOP(OP_MATCH, 0), right, 0));
79072805
LW		 1818}
1819
1820OP *
864dbfa3 1821Perl_invert(pTHX_ OP *o)
79072805 1822{
11343788
MB		 1823 if (!o)
1824 return o;
79072805 1825 /* XXX need to optimize away NOT NOT here? Or do we let optimizer do it? */
11343788 1826 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1827}
1828
1829OP *
864dbfa3 1830Perl_scope(pTHX_ OP *o)
79072805 1831{
27da23d5 1832 dVAR;
79072805 1833 if (o) {
3280af22 1834 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1835 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1836 o->op_type = OP_LEAVE;
22c35a8c 1837 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2 1838 }
fdb22418
HS		 1839 else if (o->op_type == OP_LINESEQ) {
1840 OP *kid;
1841 o->op_type = OP_SCOPE;
1842 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
1843 kid = ((LISTOP*)o)->op_first;
1844 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE)
1845 op_null(kid);
463ee0b2 1846 }
fdb22418
HS		 1847 else
1848 o = newLISTOP(OP_SCOPE, 0, o, Nullop);
79072805
LW		 1849 }
1850 return o;
1851}
1852
dfa41748 1853/* XXX kept for BINCOMPAT only */
b3ac6de7 1854void
864dbfa3 1855Perl_save_hints(pTHX)
b3ac6de7 1856{
dfa41748 1857 Perl_croak(aTHX_ "internal error: obsolete function save_hints() called");
b3ac6de7
IZ		 1858}
1859
a0d0e21e 1860int
864dbfa3 1861Perl_block_start(pTHX_ int full)
79072805 1862{
73d840c0 1863 const int retval = PL_savestack_ix;
dd2155a4 1864 pad_block_start(full);
b3ac6de7 1865 SAVEHINTS();
3280af22 1866 PL_hints &= ~HINT_BLOCK_SCOPE;
1c846c1f 1867 SAVESPTR(PL_compiling.cop_warnings);
0453d815 1868 if (! specialWARN(PL_compiling.cop_warnings)) {
599cee73
PM		 1869 PL_compiling.cop_warnings = newSVsv(PL_compiling.cop_warnings) ;
1870 SAVEFREESV(PL_compiling.cop_warnings) ;
1871 }
ac27b0f5
NIS		 1872 SAVESPTR(PL_compiling.cop_io);
1873 if (! specialCopIO(PL_compiling.cop_io)) {
1874 PL_compiling.cop_io = newSVsv(PL_compiling.cop_io) ;
1875 SAVEFREESV(PL_compiling.cop_io) ;
1876 }
a0d0e21e
LW		 1877 return retval;
1878}
1879
1880OP*
864dbfa3 1881Perl_block_end(pTHX_ I32 floor, OP *seq)
a0d0e21e 1882{
6867be6d 1883 const int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
e9f19e3c 1884 OP* retval = scalarseq(seq);
e9818f4e 1885 LEAVE_SCOPE(floor);
eb160463 1886 PL_compiling.op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
a0d0e21e 1887 if (needblockscope)
3280af22 1888 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
dd2155a4 1889 pad_leavemy();
a0d0e21e
LW		 1890 return retval;
1891}
1892
76e3520e 1893STATIC OP *
cea2e8a9 1894S_newDEFSVOP(pTHX)
54b9620d 1895{
6867be6d 1896 const I32 offset = pad_findmy("$_");
59f00321
RGS		 1897 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS(offset) & SVpad_OUR) {
1898 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
1899 }
1900 else {
1901 OP *o = newOP(OP_PADSV, 0);
1902 o->op_targ = offset;
1903 return o;
1904 }
54b9620d
MB		 1905}
1906
a0d0e21e 1907void
864dbfa3 1908Perl_newPROG(pTHX_ OP *o)
a0d0e21e 1909{
3280af22 1910 if (PL_in_eval) {
b295d113
TH		 1911 if (PL_eval_root)
1912 return;
faef0170
HS		 1913 PL_eval_root = newUNOP(OP_LEAVEEVAL,
1914 ((PL_in_eval & EVAL_KEEPERR)
1915 ? OPf_SPECIAL : 0), o);
3280af22 1916 PL_eval_start = linklist(PL_eval_root);
7934575e
GS		 1917 PL_eval_root->op_private |= OPpREFCOUNTED;
1918 OpREFCNT_set(PL_eval_root, 1);
3280af22 1919 PL_eval_root->op_next = 0;
a2efc822 1920 CALL_PEEP(PL_eval_start);
a0d0e21e
LW		 1921 }
1922 else {
6be89cf9
AE		 1923 if (o->op_type == OP_STUB) {
1924 PL_comppad_name = 0;
1925 PL_compcv = 0;
2a4f803a 1926 FreeOp(o);
a0d0e21e 1927 return;
6be89cf9 1928 }
3280af22
NIS		 1929 PL_main_root = scope(sawparens(scalarvoid(o)));
1930 PL_curcop = &PL_compiling;
1931 PL_main_start = LINKLIST(PL_main_root);
7934575e
GS		 1932 PL_main_root->op_private |= OPpREFCOUNTED;
1933 OpREFCNT_set(PL_main_root, 1);
3280af22 1934 PL_main_root->op_next = 0;
a2efc822 1935 CALL_PEEP(PL_main_start);
3280af22 1936 PL_compcv = 0;
3841441e 1937
4fdae800 1938 /* Register with debugger */
84902520 1939 if (PERLDB_INTER) {
864dbfa3 1940 CV *cv = get_cv("DB::postponed", FALSE);
3841441e
CS		 1941 if (cv) {
1942 dSP;
924508f0 1943 PUSHMARK(SP);
cc49e20b 1944 XPUSHs((SV*)CopFILEGV(&PL_compiling));
3841441e 1945 PUTBACK;
864dbfa3 1946 call_sv((SV*)cv, G_DISCARD);
3841441e
CS		 1947 }
1948 }
79072805 1949 }
79072805
LW		 1950}
1951
1952OP *
864dbfa3 1953Perl_localize(pTHX_ OP *o, I32 lex)
79072805
LW		 1954{
1955 if (o->op_flags & OPf_PARENS)
d2be0de5
YST		 1956/* [perl #17376]: this appears to be premature, and results in code such as
1957 C< our(%x); > executing in list mode rather than void mode */
1958#if 0
79072805 1959 list(o);
d2be0de5
YST		 1960#else
1961 ;
1962#endif
8990e307 1963 else {
041457d9
DM		 1964 if ( PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ','
1965 && ckWARN(WARN_PARENTHESIS))
64420d0d
JH		 1966 {
1967 char *s = PL_bufptr;
bac662ee 1968 bool sigil = FALSE;
64420d0d 1969
8473848f 1970 /* some heuristics to detect a potential error */
bac662ee 1971 while (*s && (strchr(", \t\n", *s)))
64420d0d 1972 s++;
8473848f 1973
bac662ee
TS		 1974 while (1) {
1975 if (*s && strchr("@$%*", *s) && *++s
1976 && (isALNUM(*s) || UTF8_IS_CONTINUED(*s))) {
1977 s++;
1978 sigil = TRUE;
1979 while (*s && (isALNUM(*s) || UTF8_IS_CONTINUED(*s)))
1980 s++;
1981 while (*s && (strchr(", \t\n", *s)))
1982 s++;
1983 }
1984 else
1985 break;
1986 }
1987 if (sigil && (*s == ';' || *s == '=')) {
1988 Perl_warner(aTHX_ packWARN(WARN_PARENTHESIS),
8473848f
RGS		 1989 "Parentheses missing around \"%s\" list",
1990 lex ? (PL_in_my == KEY_our ? "our" : "my")
1991 : "local");
1992 }
8990e307
LW		 1993 }
1994 }
93a17b20 1995 if (lex)
eb64745e 1996 o = my(o);
93a17b20 1997 else
eb64745e
GS		 1998 o = mod(o, OP_NULL); /* a bit kludgey */
1999 PL_in_my = FALSE;
2000 PL_in_my_stash = Nullhv;
2001 return o;
79072805
LW		 2002}
2003
2004OP *
864dbfa3 2005Perl_jmaybe(pTHX_ OP *o)
79072805
LW		 2006{
2007 if (o->op_type == OP_LIST) {
554b3eca 2008 OP *o2;
554b3eca 2009 o2 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpv(";", TRUE, SVt_PV))),
554b3eca 2010 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 2011 }
2012 return o;
2013}
2014
2015OP *
864dbfa3 2016Perl_fold_constants(pTHX_ register OP *o)
79072805 2017{
27da23d5 2018 dVAR;
79072805
LW		 2019 register OP *curop;
2020 I32 type = o->op_type;
748a9306 2021 SV *sv;
79072805 2022
22c35a8c 2023 if (PL_opargs[type] & OA_RETSCALAR)
79072805 2024 scalar(o);
b162f9ea 2025 if (PL_opargs[type] & OA_TARGET && !o->op_targ)
ed6116ce 2026 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 2027
eac055e9
GS		 2028 /* integerize op, unless it happens to be C<-foo>.
2029 * XXX should pp_i_negate() do magic string negation instead? */
2030 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)
2031 && !(type == OP_NEGATE && cUNOPo->op_first->op_type == OP_CONST
2032 && (cUNOPo->op_first->op_private & OPpCONST_BARE)))
2033 {
22c35a8c 2034 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
eac055e9 2035 }
85e6fe83 2036
22c35a8c 2037 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 2038 goto nope;
2039
de939608 2040 switch (type) {
7a52d87a
GS		 2041 case OP_NEGATE:
2042 /* XXX might want a ck_negate() for this */
2043 cUNOPo->op_first->op_private &= ~OPpCONST_STRICT;
2044 break;
de939608
CS		 2045 case OP_SPRINTF:
2046 case OP_UCFIRST:
2047 case OP_LCFIRST:
2048 case OP_UC:
2049 case OP_LC:
69dcf70c
MB		 2050 case OP_SLT:
2051 case OP_SGT:
2052 case OP_SLE:
2053 case OP_SGE:
2054 case OP_SCMP:
2de3dbcc
JH		 2055 /* XXX what about the numeric ops? */
2056 if (PL_hints & HINT_LOCALE)
de939608
CS		 2057 goto nope;
2058 }
2059
3280af22 2060 if (PL_error_count)
a0d0e21e
LW		 2061 goto nope; /* Don't try to run w/ errors */
2062
79072805 2063 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
11fa937b
GS		 2064 if ((curop->op_type != OP_CONST ||
2065 (curop->op_private & OPpCONST_BARE)) &&
7a52d87a
GS		 2066 curop->op_type != OP_LIST &&
2067 curop->op_type != OP_SCALAR &&
2068 curop->op_type != OP_NULL &&
2069 curop->op_type != OP_PUSHMARK)
2070 {
79072805
LW		 2071 goto nope;
2072 }
2073 }
2074
2075 curop = LINKLIST(o);
2076 o->op_next = 0;
533c011a 2077 PL_op = curop;
cea2e8a9 2078 CALLRUNOPS(aTHX);
3280af22 2079 sv = *(PL_stack_sp--);
748a9306 2080 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
dd2155a4 2081 pad_swipe(o->op_targ, FALSE);
748a9306
LW		 2082 else if (SvTEMP(sv)) { /* grab mortal temp? */
2083 (void)SvREFCNT_inc(sv);
2084 SvTEMP_off(sv);
85e6fe83 2085 }
79072805
LW		 2086 op_free(o);
2087 if (type == OP_RV2GV)
b1cb66bf 2088 return newGVOP(OP_GV, 0, (GV*)sv);
52a96ae6 2089 return newSVOP(OP_CONST, 0, sv);
aeea060c 2090
79072805 2091 nope:
79072805
LW		 2092 return o;
2093}
2094
2095OP *
864dbfa3 2096Perl_gen_constant_list(pTHX_ register OP *o)
79072805 2097{
27da23d5 2098 dVAR;
79072805 2099 register OP *curop;
6867be6d 2100 const I32 oldtmps_floor = PL_tmps_floor;
79072805 2101
a0d0e21e 2102 list(o);
3280af22 2103 if (PL_error_count)
a0d0e21e
LW		 2104 return o; /* Don't attempt to run with errors */
2105
533c011a 2106 PL_op = curop = LINKLIST(o);
a0d0e21e 2107 o->op_next = 0;
a2efc822 2108 CALL_PEEP(curop);
cea2e8a9
GS		 2109 pp_pushmark();
2110 CALLRUNOPS(aTHX);
533c011a 2111 PL_op = curop;
cea2e8a9 2112 pp_anonlist();
3280af22 2113 PL_tmps_floor = oldtmps_floor;
79072805
LW		 2114
2115 o->op_type = OP_RV2AV;
22c35a8c 2116 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
fb53bbb2
SG		 2117 o->op_flags &= ~OPf_REF; /* treat \(1..2) like an ordinary list */
2118 o->op_flags |= OPf_PARENS; /* and flatten \(1..2,3) */
2814eb74 2119 o->op_opt = 0; /* needs to be revisited in peep() */
79072805 2120 curop = ((UNOP*)o)->op_first;
3280af22 2121 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc(*PL_stack_sp--));
79072805 2122 op_free(curop);
79072805
LW		 2123 linklist(o);
2124 return list(o);
2125}
2126
2127OP *
864dbfa3 2128Perl_convert(pTHX_ I32 type, I32 flags, OP *o)
79072805 2129{
27da23d5 2130 dVAR;
11343788
MB		 2131 if (!o || o->op_type != OP_LIST)
2132 o = newLISTOP(OP_LIST, 0, o, Nullop);
748a9306 2133 else
5dc0d613 2134 o->op_flags &= ~OPf_WANT;
79072805 2135
22c35a8c 2136 if (!(PL_opargs[type] & OA_MARK))
93c66552 2137 op_null(cLISTOPo->op_first);
8990e307 2138
eb160463 2139 o->op_type = (OPCODE)type;
22c35a8c 2140 o->op_ppaddr = PL_ppaddr[type];
11343788 2141 o->op_flags |= flags;
79072805 2142
11343788 2143 o = CHECKOP(type, o);
fe2774ed 2144 if (o->op_type != (unsigned)type)
11343788 2145 return o;
79072805 2146
11343788 2147 return fold_constants(o);
79072805
LW		 2148}
2149
2150/* List constructors */
2151
2152OP *
864dbfa3 2153Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2154{
2155 if (!first)
2156 return last;
8990e307
LW		 2157
2158 if (!last)
79072805 2159 return first;
8990e307 2160
fe2774ed 2161 if (first->op_type != (unsigned)type
155aba94
GS		 2162 || (type == OP_LIST && (first->op_flags & OPf_PARENS)))
2163 {
2164 return newLISTOP(type, 0, first, last);
2165 }
79072805 2166
a0d0e21e
LW		 2167 if (first->op_flags & OPf_KIDS)
2168 ((LISTOP*)first)->op_last->op_sibling = last;
2169 else {
2170 first->op_flags |= OPf_KIDS;
2171 ((LISTOP*)first)->op_first = last;
2172 }
2173 ((LISTOP*)first)->op_last = last;
a0d0e21e 2174 return first;
79072805
LW		 2175}
2176
2177OP *
864dbfa3 2178Perl_append_list(pTHX_ I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2179{
2180 if (!first)
2181 return (OP*)last;
8990e307
LW		 2182
2183 if (!last)
79072805 2184 return (OP*)first;
8990e307 2185
fe2774ed 2186 if (first->op_type != (unsigned)type)
79072805 2187 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307 2188
fe2774ed 2189 if (last->op_type != (unsigned)type)
79072805
LW		 2190 return append_elem(type, (OP*)first, (OP*)last);
2191
2192 first->op_last->op_sibling = last->op_first;
2193 first->op_last = last->op_last;
117dada2 2194 first->op_flags |= (last->op_flags & OPf_KIDS);
1c846c1f 2195
238a4c30
NIS		 2196 FreeOp(last);
2197
79072805
LW		 2198 return (OP*)first;
2199}
2200
2201OP *
864dbfa3 2202Perl_prepend_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2203{
2204 if (!first)
2205 return last;
8990e307
LW		 2206
2207 if (!last)
79072805 2208 return first;
8990e307 2209
fe2774ed 2210 if (last->op_type == (unsigned)type) {
8990e307
LW		 2211 if (type == OP_LIST) { /* already a PUSHMARK there */
2212 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2213 ((LISTOP*)last)->op_first->op_sibling = first;
36a5d4ba
DC		 2214 if (!(first->op_flags & OPf_PARENS))
2215 last->op_flags &= ~OPf_PARENS;
8990e307
LW		 2216 }
2217 else {
2218 if (!(last->op_flags & OPf_KIDS)) {
2219 ((LISTOP*)last)->op_last = first;
2220 last->op_flags |= OPf_KIDS;
2221 }
2222 first->op_sibling = ((LISTOP*)last)->op_first;
2223 ((LISTOP*)last)->op_first = first;
79072805 2224 }
117dada2 2225 last->op_flags |= OPf_KIDS;
79072805
LW		 2226 return last;
2227 }
2228
2229 return newLISTOP(type, 0, first, last);
2230}
2231
2232/* Constructors */
2233
2234OP *
864dbfa3 2235Perl_newNULLLIST(pTHX)
79072805 2236{
8990e307
LW		 2237 return newOP(OP_STUB, 0);
2238}
2239
2240OP *
864dbfa3 2241Perl_force_list(pTHX_ OP *o)
8990e307 2242{
11343788
MB		 2243 if (!o || o->op_type != OP_LIST)
2244 o = newLISTOP(OP_LIST, 0, o, Nullop);
93c66552 2245 op_null(o);
11343788 2246 return o;
79072805
LW		 2247}
2248
2249OP *
864dbfa3 2250Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805 2251{
27da23d5 2252 dVAR;
79072805
LW		 2253 LISTOP *listop;
2254
b7dc083c 2255 NewOp(1101, listop, 1, LISTOP);
79072805 2256
eb160463 2257 listop->op_type = (OPCODE)type;
22c35a8c 2258 listop->op_ppaddr = PL_ppaddr[type];
117dada2
SM		 2259 if (first || last)
2260 flags |= OPf_KIDS;
eb160463 2261 listop->op_flags = (U8)flags;
79072805
LW		 2262
2263 if (!last && first)
2264 last = first;
2265 else if (!first && last)
2266 first = last;
8990e307
LW		 2267 else if (first)
2268 first->op_sibling = last;
79072805
LW		 2269 listop->op_first = first;
2270 listop->op_last = last;
8990e307
LW		 2271 if (type == OP_LIST) {
2272 OP* pushop;
2273 pushop = newOP(OP_PUSHMARK, 0);
2274 pushop->op_sibling = first;
2275 listop->op_first = pushop;
2276 listop->op_flags |= OPf_KIDS;
2277 if (!last)
2278 listop->op_last = pushop;
2279 }
79072805 2280
463d09e6 2281 return CHECKOP(type, listop);
79072805
LW		 2282}
2283
2284OP *
864dbfa3 2285Perl_newOP(pTHX_ I32 type, I32 flags)
79072805 2286{
27da23d5 2287 dVAR;
11343788 2288 OP *o;
b7dc083c 2289 NewOp(1101, o, 1, OP);
eb160463 2290 o->op_type = (OPCODE)type;
22c35a8c 2291 o->op_ppaddr = PL_ppaddr[type];
eb160463 2292 o->op_flags = (U8)flags;
79072805 2293
11343788 2294 o->op_next = o;
eb160463 2295 o->op_private = (U8)(0 | (flags >> 8));
22c35a8c 2296 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2297 scalar(o);
22c35a8c 2298 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2299 o->op_targ = pad_alloc(type, SVs_PADTMP);
2300 return CHECKOP(type, o);
79072805
LW		 2301}
2302
2303OP *
864dbfa3 2304Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first)
79072805 2305{
27da23d5 2306 dVAR;
79072805
LW		 2307 UNOP *unop;
2308
93a17b20 2309 if (!first)
aeea060c 2310 first = newOP(OP_STUB, 0);
22c35a8c 2311 if (PL_opargs[type] & OA_MARK)
8990e307 2312 first = force_list(first);
93a17b20 2313
b7dc083c 2314 NewOp(1101, unop, 1, UNOP);
eb160463 2315 unop->op_type = (OPCODE)type;
22c35a8c 2316 unop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2317 unop->op_first = first;
2318 unop->op_flags = flags | OPf_KIDS;
eb160463 2319 unop->op_private = (U8)(1 | (flags >> 8));
e50aee73 2320 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2321 if (unop->op_next)
2322 return (OP*)unop;
2323
a0d0e21e 2324 return fold_constants((OP *) unop);
79072805
LW		 2325}
2326
2327OP *
864dbfa3 2328Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805 2329{
27da23d5 2330 dVAR;
79072805 2331 BINOP *binop;
b7dc083c 2332 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2333
2334 if (!first)
2335 first = newOP(OP_NULL, 0);
2336
eb160463 2337 binop->op_type = (OPCODE)type;
22c35a8c 2338 binop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2339 binop->op_first = first;
2340 binop->op_flags = flags | OPf_KIDS;
2341 if (!last) {
2342 last = first;
eb160463 2343 binop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 2344 }
2345 else {
eb160463 2346 binop->op_private = (U8)(2 | (flags >> 8));
79072805
LW		 2347 first->op_sibling = last;
2348 }
2349
e50aee73 2350 binop = (BINOP*)CHECKOP(type, binop);
eb160463 2351 if (binop->op_next || binop->op_type != (OPCODE)type)
79072805
LW		 2352 return (OP*)binop;
2353
7284ab6f 2354 binop->op_last = binop->op_first->op_sibling;
79072805 2355
a0d0e21e 2356 return fold_constants((OP *)binop);
79072805
LW		 2357}
2358
abb2c242
JH		 2359static int uvcompare(const void *a, const void *b) __attribute__nonnull__(1) __attribute__nonnull__(2) __attribute__pure__;
2360static int uvcompare(const void *a, const void *b)
2b9d42f0 2361{
e1ec3a88 2362 if (*((const UV *)a) < (*(const UV *)b))
2b9d42f0 2363 return -1;
e1ec3a88 2364 if (*((const UV *)a) > (*(const UV *)b))
2b9d42f0 2365 return 1;
e1ec3a88 2366 if (*((const UV *)a+1) < (*(const UV *)b+1))
2b9d42f0 2367 return -1;
e1ec3a88 2368 if (*((const UV *)a+1) > (*(const UV *)b+1))
2b9d42f0 2369 return 1;
a0ed51b3
LW		 2370 return 0;
2371}
2372
79072805 2373OP *
864dbfa3 2374Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2375{
79072805
LW		 2376 SV *tstr = ((SVOP*)expr)->op_sv;
2377 SV *rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2378 STRLEN tlen;
2379 STRLEN rlen;
5c144d81
NC		 2380 const U8 *t = (U8*)SvPV_const(tstr, tlen);
2381 const U8 *r = (U8*)SvPV_const(rstr, rlen);
79072805
LW		 2382 register I32 i;
2383 register I32 j;
a0ed51b3 2384 I32 del;
79072805 2385 I32 complement;
5d06d08e 2386 I32 squash;
9b877dbb 2387 I32 grows = 0;
79072805
LW		 2388 register short *tbl;
2389
800b4dc4 2390 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2391 complement = o->op_private & OPpTRANS_COMPLEMENT;
a0ed51b3 2392 del = o->op_private & OPpTRANS_DELETE;
5d06d08e 2393 squash = o->op_private & OPpTRANS_SQUASH;
1c846c1f 2394
036b4402
GS		 2395 if (SvUTF8(tstr))
2396 o->op_private |= OPpTRANS_FROM_UTF;
1c846c1f
NIS		 2397
2398 if (SvUTF8(rstr))
036b4402 2399 o->op_private |= OPpTRANS_TO_UTF;
79072805 2400
a0ed51b3 2401 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
79cb57f6 2402 SV* listsv = newSVpvn("# comment\n",10);
a0ed51b3 2403 SV* transv = 0;
5c144d81
NC		 2404 const U8* tend = t + tlen;
2405 const U8* rend = r + rlen;
ba210ebe 2406 STRLEN ulen;
84c133a0
RB		 2407 UV tfirst = 1;
2408 UV tlast = 0;
2409 IV tdiff;
2410 UV rfirst = 1;
2411 UV rlast = 0;
2412 IV rdiff;
2413 IV diff;
a0ed51b3
LW		 2414 I32 none = 0;
2415 U32 max = 0;
2416 I32 bits;
a0ed51b3 2417 I32 havefinal = 0;
9c5ffd7c 2418 U32 final = 0;
a0ed51b3
LW		 2419 I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2420 I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
bf4a1e57
JH		 2421 U8* tsave = NULL;
2422 U8* rsave = NULL;
2423
2424 if (!from_utf) {
2425 STRLEN len = tlen;
5c144d81 2426 t = tsave = bytes_to_utf8(t, &len);
bf4a1e57
JH		 2427 tend = t + len;
2428 }
2429 if (!to_utf && rlen) {
2430 STRLEN len = rlen;
5c144d81 2431 r = rsave = bytes_to_utf8(r, &len);
bf4a1e57
JH		 2432 rend = r + len;
2433 }
a0ed51b3 2434
2b9d42f0
NIS		 2435/* There are several snags with this code on EBCDIC:
2436 1. 0xFF is a legal UTF-EBCDIC byte (there are no illegal bytes).
2437 2. scan_const() in toke.c has encoded chars in native encoding which makes
2438 ranges at least in EBCDIC 0..255 range the bottom odd.
2439*/
2440
a0ed51b3 2441 if (complement) {
89ebb4a3 2442 U8 tmpbuf[UTF8_MAXBYTES+1];
2b9d42f0 2443 UV *cp;
a0ed51b3 2444 UV nextmin = 0;
a02a5408 2445 Newx(cp, 2*tlen, UV);
a0ed51b3 2446 i = 0;
79cb57f6 2447 transv = newSVpvn("",0);
a0ed51b3 2448 while (t < tend) {
2b9d42f0
NIS		 2449 cp[2*i] = utf8n_to_uvuni(t, tend-t, &ulen, 0);
2450 t += ulen;
2451 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) {
a0ed51b3 2452 t++;
2b9d42f0
NIS		 2453 cp[2*i+1] = utf8n_to_uvuni(t, tend-t, &ulen, 0);
2454 t += ulen;
a0ed51b3 2455 }
2b9d42f0
NIS		 2456 else {
2457 cp[2*i+1] = cp[2*i];
2458 }
2459 i++;
a0ed51b3 2460 }
2b9d42f0 2461 qsort(cp, i, 2*sizeof(UV), uvcompare);
a0ed51b3 2462 for (j = 0; j < i; j++) {
2b9d42f0 2463 UV val = cp[2*j];
a0ed51b3
LW		 2464 diff = val - nextmin;
2465 if (diff > 0) {
9041c2e3 2466 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2467 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3 2468 if (diff > 1) {
2b9d42f0 2469 U8 range_mark = UTF_TO_NATIVE(0xff);
9041c2e3 2470 t = uvuni_to_utf8(tmpbuf, val - 1);
2b9d42f0 2471 sv_catpvn(transv, (char *)&range_mark, 1);
dfe13c55 2472 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2473 }
2474 }
2b9d42f0 2475 val = cp[2*j+1];
a0ed51b3
LW		 2476 if (val >= nextmin)
2477 nextmin = val + 1;
2478 }
9041c2e3 2479 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2480 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2b9d42f0
NIS		 2481 {
2482 U8 range_mark = UTF_TO_NATIVE(0xff);
2483 sv_catpvn(transv, (char *)&range_mark, 1);
2484 }
b851fbc1
JH		 2485 t = uvuni_to_utf8_flags(tmpbuf, 0x7fffffff,
2486 UNICODE_ALLOW_SUPER);
dfe13c55 2487 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
93524f2b 2488 t = (const U8*)SvPVX_const(transv);
a0ed51b3
LW		 2489 tlen = SvCUR(transv);
2490 tend = t + tlen;
455d824a 2491 Safefree(cp);
a0ed51b3
LW		 2492 }
2493 else if (!rlen && !del) {
2494 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2495 }
2496 if (!squash) {
05d340b8 2497 if ((!rlen && !del) || t == r ||
12ae5dfc 2498 (tlen == rlen && memEQ((char *)t, (char *)r, tlen)))
01ec43d0 2499 {
4757a243 2500 o->op_private |= OPpTRANS_IDENTICAL;
01ec43d0 2501 }
a0ed51b3
LW		 2502 }
2503
2504 while (t < tend || tfirst <= tlast) {
2505 /* see if we need more "t" chars */
2506 if (tfirst > tlast) {
9041c2e3 2507 tfirst = (I32)utf8n_to_uvuni(t, tend - t, &ulen, 0);
a0ed51b3 2508 t += ulen;
2b9d42f0 2509 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2510 t++;
9041c2e3 2511 tlast = (I32)utf8n_to_uvuni(t, tend - t, &ulen, 0);
a0ed51b3
LW		 2512 t += ulen;
2513 }
2514 else
2515 tlast = tfirst;
2516 }
2517
2518 /* now see if we need more "r" chars */
2519 if (rfirst > rlast) {
2520 if (r < rend) {
9041c2e3 2521 rfirst = (I32)utf8n_to_uvuni(r, rend - r, &ulen, 0);
a0ed51b3 2522 r += ulen;
2b9d42f0 2523 if (r < rend && NATIVE_TO_UTF(*r) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2524 r++;
9041c2e3 2525 rlast = (I32)utf8n_to_uvuni(r, rend - r, &ulen, 0);
a0ed51b3
LW		 2526 r += ulen;
2527 }
2528 else
2529 rlast = rfirst;
2530 }
2531 else {
2532 if (!havefinal++)
2533 final = rlast;
2534 rfirst = rlast = 0xffffffff;
2535 }
2536 }
2537
2538 /* now see which range will peter our first, if either. */
2539 tdiff = tlast - tfirst;
2540 rdiff = rlast - rfirst;
2541
2542 if (tdiff <= rdiff)
2543 diff = tdiff;
2544 else
2545 diff = rdiff;
2546
2547 if (rfirst == 0xffffffff) {
2548 diff = tdiff; /* oops, pretend rdiff is infinite */
2549 if (diff > 0)
894356b3
GS		 2550 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\tXXXX\n",
2551 (long)tfirst, (long)tlast);
a0ed51b3 2552 else
894356b3 2553 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\tXXXX\n", (long)tfirst);
a0ed51b3
LW		 2554 }
2555 else {
2556 if (diff > 0)
894356b3
GS		 2557 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\t%04lx\n",
2558 (long)tfirst, (long)(tfirst + diff),
2559 (long)rfirst);
a0ed51b3 2560 else
894356b3
GS		 2561 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\t%04lx\n",
2562 (long)tfirst, (long)rfirst);
a0ed51b3
LW		 2563
2564 if (rfirst + diff > max)
2565 max = rfirst + diff;
9b877dbb 2566 if (!grows)
45005bfb
JH		 2567 grows = (tfirst < rfirst &&
2568 UNISKIP(tfirst) < UNISKIP(rfirst + diff));
2569 rfirst += diff + 1;
a0ed51b3
LW		 2570 }
2571 tfirst += diff + 1;
2572 }
2573
2574 none = ++max;
2575 if (del)
2576 del = ++max;
2577
2578 if (max > 0xffff)
2579 bits = 32;
2580 else if (max > 0xff)
2581 bits = 16;
2582 else
2583 bits = 8;
2584
455d824a 2585 Safefree(cPVOPo->op_pv);
a0ed51b3
LW		 2586 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2587 SvREFCNT_dec(listsv);
2588 if (transv)
2589 SvREFCNT_dec(transv);
2590
45005bfb 2591 if (!del && havefinal && rlen)
b448e4fe
JH		 2592 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5,
2593 newSVuv((UV)final), 0);
a0ed51b3 2594
9b877dbb 2595 if (grows)
a0ed51b3
LW		 2596 o->op_private |= OPpTRANS_GROWS;
2597
9b877dbb
IH		 2598 if (tsave)
2599 Safefree(tsave);
2600 if (rsave)
2601 Safefree(rsave);
2602
a0ed51b3
LW		 2603 op_free(expr);
2604 op_free(repl);
2605 return o;
2606 }
2607
2608 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 2609 if (complement) {
2610 Zero(tbl, 256, short);
eb160463 2611 for (i = 0; i < (I32)tlen; i++)
ec49126f 2612 tbl[t[i]] = -1;
79072805
LW		 2613 for (i = 0, j = 0; i < 256; i++) {
2614 if (!tbl[i]) {
eb160463 2615 if (j >= (I32)rlen) {
a0ed51b3 2616 if (del)
79072805
LW		 2617 tbl[i] = -2;
2618 else if (rlen)
ec49126f 2619 tbl[i] = r[j-1];
79072805 2620 else
eb160463 2621 tbl[i] = (short)i;
79072805 2622 }
9b877dbb
IH		 2623 else {
2624 if (i < 128 && r[j] >= 128)
2625 grows = 1;
ec49126f 2626 tbl[i] = r[j++];
9b877dbb 2627 }
79072805
LW		 2628 }
2629 }
05d340b8
JH		 2630 if (!del) {
2631 if (!rlen) {
2632 j = rlen;
2633 if (!squash)
2634 o->op_private |= OPpTRANS_IDENTICAL;
2635 }
eb160463 2636 else if (j >= (I32)rlen)
05d340b8
JH		 2637 j = rlen - 1;
2638 else
2639 cPVOPo->op_pv = (char*)Renew(tbl, 0x101+rlen-j, short);
8973db79 2640 tbl[0x100] = rlen - j;
eb160463 2641 for (i=0; i < (I32)rlen - j; i++)
8973db79
JH		 2642 tbl[0x101+i] = r[j+i];
2643 }
79072805
LW		 2644 }
2645 else {
a0ed51b3 2646 if (!rlen && !del) {
79072805 2647 r = t; rlen = tlen;
5d06d08e 2648 if (!squash)
4757a243 2649 o->op_private |= OPpTRANS_IDENTICAL;
79072805 2650 }
94bfe852
RGS		 2651 else if (!squash && rlen == tlen && memEQ((char*)t, (char*)r, tlen)) {
2652 o->op_private |= OPpTRANS_IDENTICAL;
2653 }
79072805
LW		 2654 for (i = 0; i < 256; i++)
2655 tbl[i] = -1;
eb160463
GS		 2656 for (i = 0, j = 0; i < (I32)tlen; i++,j++) {
2657 if (j >= (I32)rlen) {
a0ed51b3 2658 if (del) {
ec49126f 2659 if (tbl[t[i]] == -1)
2660 tbl[t[i]] = -2;
79072805
LW		 2661 continue;
2662 }
2663 --j;
2664 }
9b877dbb
IH		 2665 if (tbl[t[i]] == -1) {
2666 if (t[i] < 128 && r[j] >= 128)
2667 grows = 1;
ec49126f 2668 tbl[t[i]] = r[j];
9b877dbb 2669 }
79072805
LW		 2670 }
2671 }
9b877dbb
IH		 2672 if (grows)
2673 o->op_private |= OPpTRANS_GROWS;
79072805
LW		 2674 op_free(expr);
2675 op_free(repl);
2676
11343788 2677 return o;
79072805
LW		 2678}
2679
2680OP *
864dbfa3 2681Perl_newPMOP(pTHX_ I32 type, I32 flags)
79072805 2682{
27da23d5 2683 dVAR;
79072805
LW		 2684 PMOP *pmop;
2685
b7dc083c 2686 NewOp(1101, pmop, 1, PMOP);
eb160463 2687 pmop->op_type = (OPCODE)type;
22c35a8c 2688 pmop->op_ppaddr = PL_ppaddr[type];
eb160463
GS		 2689 pmop->op_flags = (U8)flags;
2690 pmop->op_private = (U8)(0 | (flags >> 8));
79072805 2691
3280af22 2692 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 2693 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 2694 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 2695 pmop->op_pmpermflags |= PMf_LOCALE;
2696 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 2697
debc9467 2698#ifdef USE_ITHREADS
13137afc
AB		 2699 {
2700 SV* repointer;
2701 if(av_len((AV*) PL_regex_pad[0]) > -1) {
2702 repointer = av_pop((AV*)PL_regex_pad[0]);
2703 pmop->op_pmoffset = SvIV(repointer);
1cc8b4c5 2704 SvREPADTMP_off(repointer);
13137afc 2705 sv_setiv(repointer,0);
1eb1540c 2706 } else {
13137afc
AB		 2707 repointer = newSViv(0);
2708 av_push(PL_regex_padav,SvREFCNT_inc(repointer));
2709 pmop->op_pmoffset = av_len(PL_regex_padav);
2710 PL_regex_pad = AvARRAY(PL_regex_padav);
1fcf4c12 2711 }
13137afc 2712 }
debc9467 2713#endif
1eb1540c 2714
1fcf4c12 2715 /* link into pm list */
3280af22 2716 if (type != OP_TRANS && PL_curstash) {
8d2f4536
NC		 2717 MAGIC *mg = mg_find((SV*)PL_curstash, PERL_MAGIC_symtab);
2718
2719 if (!mg) {
2720 mg = sv_magicext((SV*)PL_curstash, 0, PERL_MAGIC_symtab, 0, 0, 0);
2721 }
2722 pmop->op_pmnext = (PMOP*)mg->mg_obj;
2723 mg->mg_obj = (SV*)pmop;
cb55de95 2724 PmopSTASH_set(pmop,PL_curstash);
79072805
LW		 2725 }
2726
463d09e6 2727 return CHECKOP(type, pmop);
79072805
LW		 2728}
2729
131b3ad0
DM		 2730/* Given some sort of match op o, and an expression expr containing a
2731 * pattern, either compile expr into a regex and attach it to o (if it's
2732 * constant), or convert expr into a runtime regcomp op sequence (if it's
2733 * not)
2734 *
2735 * isreg indicates that the pattern is part of a regex construct, eg
2736 * $x =~ /pattern/ or split /pattern/, as opposed to $x =~ $pattern or
2737 * split "pattern", which aren't. In the former case, expr will be a list
2738 * if the pattern contains more than one term (eg /a$b/) or if it contains
2739 * a replacement, ie s/// or tr///.
2740 */
2741
79072805 2742OP *
131b3ad0 2743Perl_pmruntime(pTHX_ OP *o, OP *expr, bool isreg)
79072805 2744{
27da23d5 2745 dVAR;
79072805
LW		 2746 PMOP *pm;
2747 LOGOP *rcop;
ce862d02 2748 I32 repl_has_vars = 0;
131b3ad0
DM		 2749 OP* repl = Nullop;
2750 bool reglist;
2751
2752 if (o->op_type == OP_SUBST || o->op_type == OP_TRANS) {
2753 /* last element in list is the replacement; pop it */
2754 OP* kid;
2755 repl = cLISTOPx(expr)->op_last;
2756 kid = cLISTOPx(expr)->op_first;
2757 while (kid->op_sibling != repl)
2758 kid = kid->op_sibling;
2759 kid->op_sibling = Nullop;
2760 cLISTOPx(expr)->op_last = kid;
2761 }
79072805 2762
131b3ad0
DM		 2763 if (isreg && expr->op_type == OP_LIST &&
2764 cLISTOPx(expr)->op_first->op_sibling == cLISTOPx(expr)->op_last)
2765 {
2766 /* convert single element list to element */
2767 OP* oe = expr;
2768 expr = cLISTOPx(oe)->op_first->op_sibling;
2769 cLISTOPx(oe)->op_first->op_sibling = Nullop;
2770 cLISTOPx(oe)->op_last = Nullop;
2771 op_free(oe);
2772 }
2773
2774 if (o->op_type == OP_TRANS) {
11343788 2775 return pmtrans(o, expr, repl);
131b3ad0
DM		 2776 }
2777
2778 reglist = isreg && expr->op_type == OP_LIST;
2779 if (reglist)
2780 op_null(expr);
79072805 2781
3280af22 2782 PL_hints |= HINT_BLOCK_SCOPE;
11343788 2783 pm = (PMOP*)o;
79072805
LW		 2784
2785 if (expr->op_type == OP_CONST) {
463ee0b2 2786 STRLEN plen;
79072805 2787 SV *pat = ((SVOP*)expr)->op_sv;
5c144d81 2788 const char *p = SvPV_const(pat, plen);
770526c1 2789 if ((o->op_flags & OPf_SPECIAL) && (*p == ' ' && p[1] == '\0')) {
5c144d81
NC		 2790 U32 was_readonly = SvREADONLY(pat);
2791
2792 if (was_readonly) {
2793 if (SvFAKE(pat)) {
2794 sv_force_normal_flags(pat, 0);
2795 assert(!SvREADONLY(pat));
2796 was_readonly = 0;
2797 } else {
2798 SvREADONLY_off(pat);
2799 }
2800 }
2801
93a17b20 2802 sv_setpvn(pat, "\\s+", 3);
5c144d81
NC		 2803
2804 SvFLAGS(pat) |= was_readonly;
2805
2806 p = SvPV_const(pat, plen);
79072805
LW		 2807 pm->op_pmflags |= PMf_SKIPWHITE;
2808 }
5b71a6a7 2809 if (DO_UTF8(pat))
a5961de5 2810 pm->op_pmdynflags |= PMdf_UTF8;
5c144d81
NC		 2811 /* FIXME - can we make this function take const char * args? */
2812 PM_SETRE(pm, CALLREGCOMP(aTHX_ (char*)p, (char*)p + plen, pm));
aaa362c4 2813 if (strEQ("\\s+", PM_GETRE(pm)->precomp))
85e6fe83 2814 pm->op_pmflags |= PMf_WHITE;
79072805
LW		 2815 op_free(expr);
2816 }
2817 else {
3280af22 2818 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
1c846c1f 2819 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 2820 ? OP_REGCRESET
2821 : OP_REGCMAYBE),0,expr);
463ee0b2 2822
b7dc083c 2823 NewOp(1101, rcop, 1, LOGOP);
79072805 2824 rcop->op_type = OP_REGCOMP;
22c35a8c 2825 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 2826 rcop->op_first = scalar(expr);
131b3ad0
DM		 2827 rcop->op_flags |= OPf_KIDS
2828 | ((PL_hints & HINT_RE_EVAL) ? OPf_SPECIAL : 0)
2829 | (reglist ? OPf_STACKED : 0);
79072805 2830 rcop->op_private = 1;
11343788 2831 rcop->op_other = o;
131b3ad0
DM		 2832 if (reglist)
2833 rcop->op_targ = pad_alloc(rcop->op_type, SVs_PADTMP);
2834
b5c19bd7
DM		 2835 /* /$x/ may cause an eval, since $x might be qr/(?{..})/ */
2836 PL_cv_has_eval = 1;
79072805
LW		 2837
2838 /* establish postfix order */
3280af22 2839 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 2840 LINKLIST(expr);
2841 rcop->op_next = expr;
2842 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
2843 }
2844 else {
2845 rcop->op_next = LINKLIST(expr);
2846 expr->op_next = (OP*)rcop;
2847 }
79072805 2848
11343788 2849 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 2850 }
2851
2852 if (repl) {
748a9306 2853 OP *curop;
0244c3a4 2854 if (pm->op_pmflags & PMf_EVAL) {
748a9306 2855 curop = 0;
8bafa735 2856 if (CopLINE(PL_curcop) < (line_t)PL_multi_end)
eb160463 2857 CopLINE_set(PL_curcop, (line_t)PL_multi_end);
0244c3a4 2858 }
748a9306
LW		 2859 else if (repl->op_type == OP_CONST)
2860 curop = repl;
79072805 2861 else {
79072805
LW		 2862 OP *lastop = 0;
2863 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 2864 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 2865 if (curop->op_type == OP_GV) {
638eceb6 2866 GV *gv = cGVOPx_gv(curop);
ce862d02 2867 repl_has_vars = 1;
f702bf4a 2868 if (strchr("&`'123456789+-\016\022", *GvENAME(gv)))
79072805
LW		 2869 break;
2870 }
2871 else if (curop->op_type == OP_RV2CV)
2872 break;
2873 else if (curop->op_type == OP_RV2SV ||
2874 curop->op_type == OP_RV2AV ||
2875 curop->op_type == OP_RV2HV ||
2876 curop->op_type == OP_RV2GV) {
2877 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
2878 break;
2879 }
748a9306
LW		 2880 else if (curop->op_type == OP_PADSV ||
2881 curop->op_type == OP_PADAV ||
2882 curop->op_type == OP_PADHV ||
554b3eca 2883 curop->op_type == OP_PADANY) {
ce862d02 2884 repl_has_vars = 1;
748a9306 2885 }
1167e5da
SM		 2886 else if (curop->op_type == OP_PUSHRE)
2887 ; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 2888 else
2889 break;
2890 }
2891 lastop = curop;
2892 }
748a9306 2893 }
ce862d02 2894 if (curop == repl
1c846c1f 2895 && !(repl_has_vars
aaa362c4
RS		 2896 && (!PM_GETRE(pm)
2897 || PM_GETRE(pm)->reganch & ROPT_EVAL_SEEN))) {
748a9306 2898 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 2899 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 2900 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 2901 }
2902 else {
aaa362c4 2903 if (curop == repl && !PM_GETRE(pm)) { /* Has variables. */
ce862d02
IZ		 2904 pm->op_pmflags |= PMf_MAYBE_CONST;
2905 pm->op_pmpermflags |= PMf_MAYBE_CONST;
2906 }
b7dc083c 2907 NewOp(1101, rcop, 1, LOGOP);
748a9306 2908 rcop->op_type = OP_SUBSTCONT;
22c35a8c 2909 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 2910 rcop->op_first = scalar(repl);
2911 rcop->op_flags |= OPf_KIDS;
2912 rcop->op_private = 1;
11343788 2913 rcop->op_other = o;
748a9306
LW		 2914
2915 /* establish postfix order */
2916 rcop->op_next = LINKLIST(repl);
2917 repl->op_next = (OP*)rcop;
2918
2919 pm->op_pmreplroot = scalar((OP*)rcop);
2920 pm->op_pmreplstart = LINKLIST(rcop);
2921 rcop->op_next = 0;
79072805
LW		 2922 }
2923 }
2924
2925 return (OP*)pm;
2926}
2927
2928OP *
864dbfa3 2929Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv)
79072805 2930{
27da23d5 2931 dVAR;
79072805 2932 SVOP *svop;
b7dc083c 2933 NewOp(1101, svop, 1, SVOP);
eb160463 2934 svop->op_type = (OPCODE)type;
22c35a8c 2935 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2936 svop->op_sv = sv;
2937 svop->op_next = (OP*)svop;
eb160463 2938 svop->op_flags = (U8)flags;
22c35a8c 2939 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2940 scalar((OP*)svop);
22c35a8c 2941 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2942 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2943 return CHECKOP(type, svop);
79072805
LW		 2944}
2945
2946OP *
350de78d
GS		 2947Perl_newPADOP(pTHX_ I32 type, I32 flags, SV *sv)
2948{
27da23d5 2949 dVAR;
350de78d
GS		 2950 PADOP *padop;
2951 NewOp(1101, padop, 1, PADOP);
eb160463 2952 padop->op_type = (OPCODE)type;
350de78d
GS		 2953 padop->op_ppaddr = PL_ppaddr[type];
2954 padop->op_padix = pad_alloc(type, SVs_PADTMP);
dd2155a4
DM		 2955 SvREFCNT_dec(PAD_SVl(padop->op_padix));
2956 PAD_SETSV(padop->op_padix, sv);
ce50c033
AMS		 2957 if (sv)
2958 SvPADTMP_on(sv);
350de78d 2959 padop->op_next = (OP*)padop;
eb160463 2960 padop->op_flags = (U8)flags;
350de78d
GS		 2961 if (PL_opargs[type] & OA_RETSCALAR)
2962 scalar((OP*)padop);
2963 if (PL_opargs[type] & OA_TARGET)
2964 padop->op_targ = pad_alloc(type, SVs_PADTMP);
2965 return CHECKOP(type, padop);
2966}
2967
2968OP *
864dbfa3 2969Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
79072805 2970{
27da23d5 2971 dVAR;
350de78d 2972#ifdef USE_ITHREADS
ce50c033
AMS		 2973 if (gv)
2974 GvIN_PAD_on(gv);
350de78d
GS		 2975 return newPADOP(type, flags, SvREFCNT_inc(gv));
2976#else
7934575e 2977 return newSVOP(type, flags, SvREFCNT_inc(gv));
350de78d 2978#endif
79072805
LW		 2979}
2980
2981OP *
864dbfa3 2982Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv)
79072805 2983{
27da23d5 2984 dVAR;
79072805 2985 PVOP *pvop;
b7dc083c 2986 NewOp(1101, pvop, 1, PVOP);
eb160463 2987 pvop->op_type = (OPCODE)type;
22c35a8c 2988 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 2989 pvop->op_pv = pv;
2990 pvop->op_next = (OP*)pvop;
eb160463 2991 pvop->op_flags = (U8)flags;
22c35a8c 2992 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 2993 scalar((OP*)pvop);
22c35a8c 2994 if (PL_opargs[type] & OA_TARGET)
ed6116ce 2995 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 2996 return CHECKOP(type, pvop);
79072805
LW		 2997}
2998
79072805 2999void
864dbfa3 3000Perl_package(pTHX_ OP *o)
79072805 3001{
6867be6d 3002 const char *name;
de11ba31 3003 STRLEN len;
79072805 3004
3280af22
NIS		 3005 save_hptr(&PL_curstash);
3006 save_item(PL_curstname);
de11ba31 3007
5c144d81 3008 name = SvPV_const(cSVOPo->op_sv, len);
de11ba31
AMS		 3009 PL_curstash = gv_stashpvn(name, len, TRUE);
3010 sv_setpvn(PL_curstname, name, len);
3011 op_free(o);
3012
7ad382f4 3013 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 3014 PL_copline = NOLINE;
3015 PL_expect = XSTATE;
79072805
LW		 3016}
3017
85e6fe83 3018void
88d95a4d 3019Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *idop, OP *arg)
85e6fe83 3020{
a0d0e21e 3021 OP *pack;
a0d0e21e 3022 OP *imop;
b1cb66bf 3023 OP *veop;
85e6fe83 3024
88d95a4d 3025 if (idop->op_type != OP_CONST)
cea2e8a9 3026 Perl_croak(aTHX_ "Module name must be constant");
85e6fe83 3027
b1cb66bf 3028 veop = Nullop;
3029
aec46f14 3030 if (version) {
b1cb66bf 3031 SV *vesv = ((SVOP*)version)->op_sv;
3032
aec46f14 3033 if (!arg && !SvNIOKp(vesv)) {
b1cb66bf 3034 arg = version;
3035 }
3036 else {
3037 OP *pack;
0f79a09d 3038 SV *meth;
b1cb66bf 3039
44dcb63b 3040 if (version->op_type != OP_CONST || !SvNIOKp(vesv))
cea2e8a9 3041 Perl_croak(aTHX_ "Version number must be constant number");
b1cb66bf 3042
88d95a4d
JH		 3043 /* Make copy of idop so we don't free it twice */
3044 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
b1cb66bf 3045
3046 /* Fake up a method call to VERSION */
427d62a4 3047 meth = newSVpvn_share("VERSION", 7, 0);
b1cb66bf 3048 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
3049 append_elem(OP_LIST,
0f79a09d
GS		 3050 prepend_elem(OP_LIST, pack, list(version)),
3051 newSVOP(OP_METHOD_NAMED, 0, meth)));
b1cb66bf 3052 }
3053 }
aeea060c 3054
a0d0e21e 3055 /* Fake up an import/unimport */
4633a7c4
LW		 3056 if (arg && arg->op_type == OP_STUB)
3057 imop = arg; /* no import on explicit () */
88d95a4d 3058 else if (SvNIOKp(((SVOP*)idop)->op_sv)) {
b1cb66bf 3059 imop = Nullop; /* use 5.0; */
3060 }
4633a7c4 3061 else {
0f79a09d
GS		 3062 SV *meth;
3063
88d95a4d
JH		 3064 /* Make copy of idop so we don't free it twice */
3065 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
0f79a09d
GS		 3066
3067 /* Fake up a method call to import/unimport */
427d62a4
NC		 3068 meth = aver
3069 ? newSVpvn_share("import",6, 0) : newSVpvn_share("unimport", 8, 0);
4633a7c4 3070 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
0f79a09d
GS		 3071 append_elem(OP_LIST,
3072 prepend_elem(OP_LIST, pack, list(arg)),
3073 newSVOP(OP_METHOD_NAMED, 0, meth)));
4633a7c4
LW		 3074 }
3075
a0d0e21e 3076 /* Fake up the BEGIN {}, which does its thing immediately. */
09bef843 3077 newATTRSUB(floor,
427d62a4 3078 newSVOP(OP_CONST, 0, newSVpvn_share("BEGIN", 5, 0)),
4633a7c4 3079 Nullop,
09bef843 3080 Nullop,
a0d0e21e 3081 append_elem(OP_LINESEQ,
b1cb66bf 3082 append_elem(OP_LINESEQ,
88d95a4d 3083 newSTATEOP(0, Nullch, newUNOP(OP_REQUIRE, 0, idop)),
b1cb66bf 3084 newSTATEOP(0, Nullch, veop)),
a0d0e21e 3085 newSTATEOP(0, Nullch, imop) ));
85e6fe83 3086
70f5e4ed
JH		 3087 /* The "did you use incorrect case?" warning used to be here.
3088 * The problem is that on case-insensitive filesystems one
3089 * might get false positives for "use" (and "require"):
3090 * "use Strict" or "require CARP" will work. This causes
3091 * portability problems for the script: in case-strict
3092 * filesystems the script will stop working.
3093 *
3094 * The "incorrect case" warning checked whether "use Foo"
3095 * imported "Foo" to your namespace, but that is wrong, too:
3096 * there is no requirement nor promise in the language that
3097 * a Foo.pm should or would contain anything in package "Foo".
3098 *
3099 * There is very little Configure-wise that can be done, either:
3100 * the case-sensitivity of the build filesystem of Perl does not
3101 * help in guessing the case-sensitivity of the runtime environment.
3102 */
18fc9488 3103
c305c6a0 3104 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 3105 PL_copline = NOLINE;
3106 PL_expect = XSTATE;
8ec8fbef 3107 PL_cop_seqmax++; /* Purely for B::*'s benefit */
85e6fe83
LW		 3108}
3109
7d3fb230 3110/*
ccfc67b7
JH		 3111=head1 Embedding Functions
3112
7d3fb230
BS		 3113=for apidoc load_module
3114
3115Loads the module whose name is pointed to by the string part of name.
3116Note that the actual module name, not its filename, should be given.
3117Eg, "Foo::Bar" instead of "Foo/Bar.pm". flags can be any of
3118PERL_LOADMOD_DENY, PERL_LOADMOD_NOIMPORT, or PERL_LOADMOD_IMPORT_OPS
3119(or 0 for no flags). ver, if specified, provides version semantics
3120similar to C<use Foo::Bar VERSION>. The optional trailing SV*
3121arguments can be used to specify arguments to the module's import()
3122method, similar to C<use Foo::Bar VERSION LIST>.
3123
3124=cut */
3125
e4783991
GS		 3126void
3127Perl_load_module(pTHX_ U32 flags, SV *name, SV *ver, ...)
3128{
3129 va_list args;
3130 va_start(args, ver);
3131 vload_module(flags, name, ver, &args);
3132 va_end(args);
3133}
3134
3135#ifdef PERL_IMPLICIT_CONTEXT
3136void
3137Perl_load_module_nocontext(U32 flags, SV *name, SV *ver, ...)
3138{
3139 dTHX;
3140 va_list args;
3141 va_start(args, ver);
3142 vload_module(flags, name, ver, &args);
3143 va_end(args);
3144}
3145#endif
3146
3147void
3148Perl_vload_module(pTHX_ U32 flags, SV *name, SV *ver, va_list *args)
3149{
3150 OP *modname, *veop, *imop;
3151
3152 modname = newSVOP(OP_CONST, 0, name);
3153 modname->op_private |= OPpCONST_BARE;
3154 if (ver) {
3155 veop = newSVOP(OP_CONST, 0, ver);
3156 }
3157 else
3158 veop = Nullop;
3159 if (flags & PERL_LOADMOD_NOIMPORT) {
3160 imop = sawparens(newNULLLIST());
3161 }
3162 else if (flags & PERL_LOADMOD_IMPORT_OPS) {
3163 imop = va_arg(*args, OP*);
3164 }
3165 else {
3166 SV *sv;
3167 imop = Nullop;
3168 sv = va_arg(*args, SV*);
3169 while (sv) {
3170 imop = append_elem(OP_LIST, imop, newSVOP(OP_CONST, 0, sv));
3171 sv = va_arg(*args, SV*);
3172 }
3173 }
81885997 3174 {
6867be6d
AL		 3175 const line_t ocopline = PL_copline;
3176 COP * const ocurcop = PL_curcop;
3177 const int oexpect = PL_expect;
81885997
GS		 3178
3179 utilize(!(flags & PERL_LOADMOD_DENY), start_subparse(FALSE, 0),
3180 veop, modname, imop);
3181 PL_expect = oexpect;
3182 PL_copline = ocopline;
834a3ffa 3183 PL_curcop = ocurcop;
81885997 3184 }
e4783991
GS		 3185}
3186
79072805 3187OP *
864dbfa3 3188Perl_dofile(pTHX_ OP *term)
78ca652e
GS		 3189{
3190 OP *doop;
3191 GV *gv;
3192
3193 gv = gv_fetchpv("do", FALSE, SVt_PVCV);
b9f751c0 3194 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv)))
78ca652e
GS		 3195 gv = gv_fetchpv("CORE::GLOBAL::do", FALSE, SVt_PVCV);
3196
b9f751c0 3197 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
78ca652e
GS		 3198 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
3199 append_elem(OP_LIST, term,
3200 scalar(newUNOP(OP_RV2CV, 0,
3201 newGVOP(OP_GV, 0,
3202 gv))))));
3203 }
3204 else {
3205 doop = newUNOP(OP_DOFILE, 0, scalar(term));
3206 }
3207 return doop;
3208}
3209
3210OP *
864dbfa3 3211Perl_newSLICEOP(pTHX_ I32 flags, OP *subscript, OP *listval)
79072805
LW		 3212{
3213 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 3214 list(force_list(subscript)),
3215 list(force_list(listval)) );
79072805
LW		 3216}
3217
76e3520e 3218STATIC I32
504618e9 3219S_is_list_assignment(pTHX_ register const OP *o)
79072805 3220{
11343788 3221 if (!o)
79072805
LW		 3222 return TRUE;
3223
11343788
MB		 3224 if (o->op_type == OP_NULL && o->op_flags & OPf_KIDS)
3225 o = cUNOPo->op_first;
79072805 3226
11343788 3227 if (o->op_type == OP_COND_EXPR) {
504618e9
AL		 3228 const I32 t = is_list_assignment(cLOGOPo->op_first->op_sibling);
3229 const I32 f = is_list_assignment(cLOGOPo->op_first->op_sibling->op_sibling);
79072805
LW		 3230
3231 if (t && f)
3232 return TRUE;
3233 if (t || f)
3234 yyerror("Assignment to both a list and a scalar");
3235 return FALSE;
3236 }
3237
95f0a2f1
SB		 3238 if (o->op_type == OP_LIST &&
3239 (o->op_flags & OPf_WANT) == OPf_WANT_SCALAR &&
3240 o->op_private & OPpLVAL_INTRO)
3241 return FALSE;
3242
11343788
MB		 3243 if (o->op_type == OP_LIST || o->op_flags & OPf_PARENS ||
3244 o->op_type == OP_RV2AV || o->op_type == OP_RV2HV ||
3245 o->op_type == OP_ASLICE || o->op_type == OP_HSLICE)
79072805
LW		 3246 return TRUE;
3247
11343788 3248 if (o->op_type == OP_PADAV || o->op_type == OP_PADHV)
93a17b20
LW		 3249 return TRUE;
3250
11343788 3251 if (o->op_type == OP_RV2SV)
79072805
LW		 3252 return FALSE;
3253
3254 return FALSE;
3255}
3256
3257OP *
864dbfa3 3258Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
79072805 3259{
11343788 3260 OP *o;
79072805 3261
a0d0e21e 3262 if (optype) {
c963b151 3263 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN || optype == OP_DORASSIGN) {
a0d0e21e
LW		 3264 return newLOGOP(optype, 0,
3265 mod(scalar(left), optype),
3266 newUNOP(OP_SASSIGN, 0, scalar(right)));
3267 }
3268 else {
3269 return newBINOP(optype, OPf_STACKED,
3270 mod(scalar(left), optype), scalar(right));
3271 }
3272 }
3273
504618e9 3274 if (is_list_assignment(left)) {
10c8fecd
GS		 3275 OP *curop;
3276
3280af22 3277 PL_modcount = 0;
dbfe47cf
RD		 3278 /* Grandfathering $[ assignment here. Bletch.*/
3279 /* Only simple assignments like C<< ($[) = 1 >> are allowed */
3280 PL_eval_start = (left->op_type == OP_CONST) ? right : 0;
463ee0b2 3281 left = mod(left, OP_AASSIGN);
3280af22
NIS		 3282 if (PL_eval_start)
3283 PL_eval_start = 0;
dbfe47cf
RD		 3284 else if (left->op_type == OP_CONST) {
3285 /* Result of assignment is always 1 (or we'd be dead already) */
3286 return newSVOP(OP_CONST, 0, newSViv(1));
a0d0e21e 3287 }
b9d46b39
RGS		 3288 /* optimise C<my @x = ()> to C<my @x>, and likewise for hashes */
3289 if ((left->op_type == OP_PADAV || left->op_type == OP_PADHV)
3290 && right->op_type == OP_STUB
3291 && (left->op_private & OPpLVAL_INTRO))
3292 {
3293 op_free(right);
9ff53bc9 3294 left->op_flags &= ~(OPf_REF|OPf_SPECIAL);
b9d46b39
RGS		 3295 return left;
3296 }
10c8fecd
GS		 3297 curop = list(force_list(left));
3298 o = newBINOP(OP_AASSIGN, flags, list(force_list(right)), curop);
eb160463 3299 o->op_private = (U8)(0 | (flags >> 8));
dd2155a4
DM		 3300
3301 /* PL_generation sorcery:
3302 * an assignment like ($a,$b) = ($c,$d) is easier than
3303 * ($a,$b) = ($c,$a), since there is no need for temporary vars.
3304 * To detect whether there are common vars, the global var
3305 * PL_generation is incremented for each assign op we compile.
3306 * Then, while compiling the assign op, we run through all the
3307 * variables on both sides of the assignment, setting a spare slot
3308 * in each of them to PL_generation. If any of them already have
3309 * that value, we know we've got commonality. We could use a
3310 * single bit marker, but then we'd have to make 2 passes, first
3311 * to clear the flag, then to test and set it. To find somewhere
3312 * to store these values, evil chicanery is done with SvCUR().
3313 */
3314
a0d0e21e 3315 if (!(left->op_private & OPpLVAL_INTRO)) {
11343788 3316 OP *lastop = o;
3280af22 3317 PL_generation++;
11343788 3318 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 3319 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 3320 if (curop->op_type == OP_GV) {
638eceb6 3321 GV *gv = cGVOPx_gv(curop);
eb160463 3322 if (gv == PL_defgv || (int)SvCUR(gv) == PL_generation)
79072805 3323 break;
b162af07 3324 SvCUR_set(gv, PL_generation);
79072805 3325 }
748a9306
LW		 3326 else if (curop->op_type == OP_PADSV ||
3327 curop->op_type == OP_PADAV ||
3328 curop->op_type == OP_PADHV ||
dd2155a4
DM		 3329 curop->op_type == OP_PADANY)
3330 {
3331 if (PAD_COMPNAME_GEN(curop->op_targ)
92251a1e 3332 == (STRLEN)PL_generation)
748a9306 3333 break;
b162af07 3334 PAD_COMPNAME_GEN_set(curop->op_targ, PL_generation);
dd2155a4 3335
748a9306 3336 }
79072805
LW		 3337 else if (curop->op_type == OP_RV2CV)
3338 break;
3339 else if (curop->op_type == OP_RV2SV ||
3340 curop->op_type == OP_RV2AV ||
3341 curop->op_type == OP_RV2HV ||
3342 curop->op_type == OP_RV2GV) {
3343 if (lastop->op_type != OP_GV) /* funny deref? */
3344 break;
3345 }
1167e5da
SM		 3346 else if (curop->op_type == OP_PUSHRE) {
3347 if (((PMOP*)curop)->op_pmreplroot) {
b3f5893f 3348#ifdef USE_ITHREADS
dd2155a4
DM		 3349 GV *gv = (GV*)PAD_SVl(INT2PTR(PADOFFSET,
3350 ((PMOP*)curop)->op_pmreplroot));
b3f5893f 3351#else
1167e5da 3352 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
b3f5893f 3353#endif
eb160463 3354 if (gv == PL_defgv || (int)SvCUR(gv) == PL_generation)
1167e5da 3355 break;
b162af07 3356 SvCUR_set(gv, PL_generation);
b2ffa427 3357 }
1167e5da 3358 }
79072805
LW		 3359 else
3360 break;
3361 }
3362 lastop = curop;
3363 }
11343788 3364 if (curop != o)
10c8fecd 3365 o->op_private |= OPpASSIGN_COMMON;
79072805 3366 }
c07a80fd 3367 if (right && right->op_type == OP_SPLIT) {
3368 OP* tmpop;
3369 if ((tmpop = ((LISTOP*)right)->op_first) &&
3370 tmpop->op_type == OP_PUSHRE)
3371 {
3372 PMOP *pm = (PMOP*)tmpop;
3373 if (left->op_type == OP_RV2AV &&
3374 !(left->op_private & OPpLVAL_INTRO) &&
11343788 3375 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 3376 {
3377 tmpop = ((UNOP*)left)->op_first;
3378 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
971a9dd3 3379#ifdef USE_ITHREADS
ba89bb6e 3380 pm->op_pmreplroot = INT2PTR(OP*, cPADOPx(tmpop)->op_padix);
971a9dd3
GS		 3381 cPADOPx(tmpop)->op_padix = 0; /* steal it */
3382#else
3383 pm->op_pmreplroot = (OP*)cSVOPx(tmpop)->op_sv;
3384 cSVOPx(tmpop)->op_sv = Nullsv; /* steal it */
3385#endif
c07a80fd 3386 pm->op_pmflags |= PMf_ONCE;
11343788 3387 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 3388 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
3389 tmpop->op_sibling = Nullop; /* don't free split */
3390 right->op_next = tmpop->op_next; /* fix starting loc */
11343788 3391 op_free(o); /* blow off assign */
54310121 3392 right->op_flags &= ~OPf_WANT;
a5f75d66 3393 /* "I don't know and I don't care." */
c07a80fd 3394 return right;
3395 }
3396 }
3397 else {
e6438c1a 3398 if (PL_modcount < RETURN_UNLIMITED_NUMBER &&
c07a80fd 3399 ((LISTOP*)right)->op_last->op_type == OP_CONST)
3400 {
3401 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
3402 if (SvIVX(sv) == 0)
3280af22 3403 sv_setiv(sv, PL_modcount+1);
c07a80fd 3404 }
3405 }
3406 }
3407 }
11343788 3408 return o;
79072805
LW		 3409 }
3410 if (!right)
3411 right = newOP(OP_UNDEF, 0);
3412 if (right->op_type == OP_READLINE) {
3413 right->op_flags |= OPf_STACKED;
463ee0b2 3414 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 3415 }
a0d0e21e 3416 else {
3280af22 3417 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 3418 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 3419 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 3420 if (PL_eval_start)
3421 PL_eval_start = 0;
748a9306 3422 else {
dbfe47cf 3423 o = newSVOP(OP_CONST, 0, newSViv(PL_compiling.cop_arybase));
a0d0e21e
LW		 3424 }
3425 }
11343788 3426 return o;
79072805
LW		 3427}
3428
3429OP *
864dbfa3 3430Perl_newSTATEOP(pTHX_ I32 flags, char *label, OP *o)
79072805 3431{
27da23d5 3432 dVAR;
e1ec3a88 3433 const U32 seq = intro_my();
79072805
LW		 3434 register COP *cop;
3435
b7dc083c 3436 NewOp(1101, cop, 1, COP);
57843af0 3437 if (PERLDB_LINE && CopLINE(PL_curcop) && PL_curstash != PL_debstash) {
8990e307 3438 cop->op_type = OP_DBSTATE;
22c35a8c 3439 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 3440 }
3441 else {
3442 cop->op_type = OP_NEXTSTATE;
22c35a8c 3443 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 3444 }
eb160463
GS		 3445 cop->op_flags = (U8)flags;
3446 cop->op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
ff0cee69 3447#ifdef NATIVE_HINTS
3448 cop->op_private |= NATIVE_HINTS;
3449#endif
e24b16f9 3450 PL_compiling.op_private = cop->op_private;
79072805
LW		 3451 cop->op_next = (OP*)cop;
3452
463ee0b2
LW		 3453 if (label) {
3454 cop->cop_label = label;
3280af22 3455 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 3456 }
bbce6d69 3457 cop->cop_seq = seq;
3280af22 3458 cop->cop_arybase = PL_curcop->cop_arybase;
0453d815 3459 if (specialWARN(PL_curcop->cop_warnings))
599cee73 3460 cop->cop_warnings = PL_curcop->cop_warnings ;
1c846c1f 3461 else
599cee73 3462 cop->cop_warnings = newSVsv(PL_curcop->cop_warnings) ;
ac27b0f5
NIS		 3463 if (specialCopIO(PL_curcop->cop_io))
3464 cop->cop_io = PL_curcop->cop_io;
3465 else
3466 cop->cop_io = newSVsv(PL_curcop->cop_io) ;
599cee73 3467
79072805 3468
3280af22 3469 if (PL_copline == NOLINE)
57843af0 3470 CopLINE_set(cop, CopLINE(PL_curcop));
79072805 3471 else {
57843af0 3472 CopLINE_set(cop, PL_copline);
3280af22 3473 PL_copline = NOLINE;
79072805 3474 }
57843af0 3475#ifdef USE_ITHREADS
f4dd75d9 3476 CopFILE_set(cop, CopFILE(PL_curcop)); /* XXX share in a pvtable? */
57843af0 3477#else
f4dd75d9 3478 CopFILEGV_set(cop, CopFILEGV(PL_curcop));
57843af0 3479#endif
11faa288 3480 CopSTASH_set(cop, PL_curstash);
79072805 3481
3280af22 3482 if (PERLDB_LINE && PL_curstash != PL_debstash) {
cc49e20b 3483 SV **svp = av_fetch(CopFILEAV(PL_curcop), (I32)CopLINE(cop), FALSE);
1eb1540c 3484 if (svp && *svp != &PL_sv_undef ) {
0ac0412a 3485 (void)SvIOK_on(*svp);
45977657 3486 SvIV_set(*svp, PTR2IV(cop));
1eb1540c 3487 }
93a17b20
LW		 3488 }
3489
722969e2 3490 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3491}
3492
bbce6d69 3493
79072805 3494OP *
864dbfa3 3495Perl_newLOGOP(pTHX_ I32 type, I32 flags, OP *first, OP *other)
79072805 3496{
27da23d5 3497 dVAR;
883ffac3
CS		 3498 return new_logop(type, flags, &first, &other);
3499}
3500
3bd495df 3501STATIC OP *
cea2e8a9 3502S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
883ffac3 3503{
27da23d5 3504 dVAR;
79072805 3505 LOGOP *logop;
11343788 3506 OP *o;
883ffac3
CS		 3507 OP *first = *firstp;
3508 OP *other = *otherp;
79072805 3509
a0d0e21e
LW		 3510 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
3511 return newBINOP(type, flags, scalar(first), scalar(other));
3512
8990e307 3513 scalarboolean(first);
79072805
LW		 3514 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
3515 if (first->op_type == OP_NOT && (first->op_flags & OPf_SPECIAL)) {
3516 if (type == OP_AND || type == OP_OR) {
3517 if (type == OP_AND)
3518 type = OP_OR;
3519 else
3520 type = OP_AND;
11343788 3521 o = first;
883ffac3 3522 first = *firstp = cUNOPo->op_first;
11343788
MB		 3523 if (o->op_next)
3524 first->op_next = o->op_next;
3525 cUNOPo->op_first = Nullop;
3526 op_free(o);
79072805
LW		 3527 }
3528 }
3529 if (first->op_type == OP_CONST) {
39a440a3
DM		 3530 if (first->op_private & OPpCONST_STRICT)
3531 no_bareword_allowed(first);
041457d9 3532 else if ((first->op_private & OPpCONST_BARE) && ckWARN(WARN_BAREWORD))
989dfb19 3533 Perl_warner(aTHX_ packWARN(WARN_BAREWORD), "Bareword found in conditional");
75cc09e4
MHM		 3534 if ((type == OP_AND && SvTRUE(((SVOP*)first)->op_sv)) ||
3535 (type == OP_OR && !SvTRUE(((SVOP*)first)->op_sv)) ||
3536 (type == OP_DOR && !SvOK(((SVOP*)first)->op_sv))) {
79072805 3537 op_free(first);
883ffac3 3538 *firstp = Nullop;
d6fee5c7
DM		 3539 if (other->op_type == OP_CONST)
3540 other->op_private |= OPpCONST_SHORTCIRCUIT;
79072805
LW		 3541 return other;
3542 }
3543 else {
7921d0f2 3544 /* check for C<my $x if 0>, or C<my($x,$y) if 0> */
6867be6d 3545 const OP *o2 = other;
7921d0f2
DM		 3546 if ( ! (o2->op_type == OP_LIST
3547 && (( o2 = cUNOPx(o2)->op_first))
3548 && o2->op_type == OP_PUSHMARK
3549 && (( o2 = o2->op_sibling)) )
3550 )
3551 o2 = other;
3552 if ((o2->op_type == OP_PADSV || o2->op_type == OP_PADAV
3553 || o2->op_type == OP_PADHV)
3554 && o2->op_private & OPpLVAL_INTRO
3555 && ckWARN(WARN_DEPRECATED))
3556 {
3557 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
3558 "Deprecated use of my() in false conditional");
3559 }
3560
79072805 3561 op_free(other);
883ffac3 3562 *otherp = Nullop;
d6fee5c7
DM		 3563 if (first->op_type == OP_CONST)
3564 first->op_private |= OPpCONST_SHORTCIRCUIT;
79072805
LW		 3565 return first;
3566 }
3567 }
041457d9
DM		 3568 else if ((first->op_flags & OPf_KIDS) && type != OP_DOR
3569 && ckWARN(WARN_MISC)) /* [#24076] Don't warn for <FH> err FOO. */
59e10468 3570 {
6867be6d
AL		 3571 const OP *k1 = ((UNOP*)first)->op_first;
3572 const OP *k2 = k1->op_sibling;
a6006777 3573 OPCODE warnop = 0;
3574 switch (first->op_type)
3575 {
3576 case OP_NULL:
3577 if (k2 && k2->op_type == OP_READLINE
3578 && (k2->op_flags & OPf_STACKED)
1c846c1f 3579 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
72b16652 3580 {
a6006777 3581 warnop = k2->op_type;
72b16652 3582 }
a6006777 3583 break;
3584
3585 case OP_SASSIGN:
68dc0745 3586 if (k1->op_type == OP_READDIR
3587 || k1->op_type == OP_GLOB
72b16652 3588 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
68dc0745 3589 || k1->op_type == OP_EACH)
72b16652
GS		 3590 {
3591 warnop = ((k1->op_type == OP_NULL)
eb160463 3592 ? (OPCODE)k1->op_targ : k1->op_type);
72b16652 3593 }
a6006777 3594 break;
3595 }
8ebc5c01 3596 if (warnop) {
6867be6d 3597 const line_t oldline = CopLINE(PL_curcop);
57843af0 3598 CopLINE_set(PL_curcop, PL_copline);
9014280d 3599 Perl_warner(aTHX_ packWARN(WARN_MISC),
599cee73 3600 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 3601 PL_op_desc[warnop],
68dc0745 3602 ((warnop == OP_READLINE || warnop == OP_GLOB)
3603 ? " construct" : "() operator"));
57843af0 3604 CopLINE_set(PL_curcop, oldline);
8ebc5c01 3605 }
a6006777 3606 }
79072805
LW		 3607
3608 if (!other)
3609 return first;
3610
c963b151 3611 if (type == OP_ANDASSIGN || type == OP_ORASSIGN || type == OP_DORASSIGN)
a0d0e21e
LW		 3612 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
3613
b7dc083c 3614 NewOp(1101, logop, 1, LOGOP);
79072805 3615
eb160463 3616 logop->op_type = (OPCODE)type;
22c35a8c 3617 logop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3618 logop->op_first = first;
3619 logop->op_flags = flags | OPf_KIDS;
3620 logop->op_other = LINKLIST(other);
eb160463 3621 logop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 3622
3623 /* establish postfix order */
3624 logop->op_next = LINKLIST(first);
3625 first->op_next = (OP*)logop;
3626 first->op_sibling = other;
3627
463d09e6
RGS		 3628 CHECKOP(type,logop);
3629
11343788
MB		 3630 o = newUNOP(OP_NULL, 0, (OP*)logop);
3631 other->op_next = o;
79072805 3632
11343788 3633 return o;
79072805
LW		 3634}
3635
3636OP *
864dbfa3 3637Perl_newCONDOP(pTHX_ I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 3638{
27da23d5 3639 dVAR;
1a67a97c
SM		 3640 LOGOP *logop;
3641 OP *start;
11343788 3642 OP *o;
79072805 3643
b1cb66bf 3644 if (!falseop)
3645 return newLOGOP(OP_AND, 0, first, trueop);
3646 if (!trueop)
3647 return newLOGOP(OP_OR, 0, first, falseop);
79072805 3648
8990e307 3649 scalarboolean(first);
79072805 3650 if (first->op_type == OP_CONST) {
2bc6235c
K		 3651 if (first->op_private & OPpCONST_BARE &&
3652 first->op_private & OPpCONST_STRICT) {
3653 no_bareword_allowed(first);
3654 }
79072805
LW		 3655 if (SvTRUE(((SVOP*)first)->op_sv)) {
3656 op_free(first);
b1cb66bf 3657 op_free(falseop);
3658 return trueop;
79072805
LW		 3659 }
3660 else {
3661 op_free(first);
b1cb66bf 3662 op_free(trueop);
3663 return falseop;
79072805
LW		 3664 }
3665 }
1a67a97c
SM		 3666 NewOp(1101, logop, 1, LOGOP);
3667 logop->op_type = OP_COND_EXPR;
3668 logop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
3669 logop->op_first = first;
3670 logop->op_flags = flags | OPf_KIDS;
eb160463 3671 logop->op_private = (U8)(1 | (flags >> 8));
1a67a97c
SM		 3672 logop->op_other = LINKLIST(trueop);
3673 logop->op_next = LINKLIST(falseop);
79072805 3674
463d09e6
RGS		 3675 CHECKOP(OP_COND_EXPR, /* that's logop->op_type */
3676 logop);
79072805
LW		 3677
3678 /* establish postfix order */
1a67a97c
SM		 3679 start = LINKLIST(first);
3680 first->op_next = (OP*)logop;
79072805 3681
b1cb66bf 3682 first->op_sibling = trueop;
3683 trueop->op_sibling = falseop;
1a67a97c 3684 o = newUNOP(OP_NULL, 0, (OP*)logop);
79072805 3685
1a67a97c 3686 trueop->op_next = falseop->op_next = o;
79072805 3687
1a67a97c 3688 o->op_next = start;
11343788 3689 return o;
79072805
LW		 3690}
3691
3692OP *
864dbfa3 3693Perl_newRANGE(pTHX_ I32 flags, OP *left, OP *right)
79072805 3694{
27da23d5 3695 dVAR;
1a67a97c 3696 LOGOP *range;
79072805
LW		 3697 OP *flip;
3698 OP *flop;
1a67a97c 3699 OP *leftstart;
11343788 3700 OP *o;
79072805 3701
1a67a97c 3702 NewOp(1101, range, 1, LOGOP);
79072805 3703
1a67a97c
SM		 3704 range->op_type = OP_RANGE;
3705 range->op_ppaddr = PL_ppaddr[OP_RANGE];
3706 range->op_first = left;
3707 range->op_flags = OPf_KIDS;
3708 leftstart = LINKLIST(left);
3709 range->op_other = LINKLIST(right);
eb160463 3710 range->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 3711
3712 left->op_sibling = right;
3713
1a67a97c
SM		 3714 range->op_next = (OP*)range;
3715 flip = newUNOP(OP_FLIP, flags, (OP*)range);
79072805 3716 flop = newUNOP(OP_FLOP, 0, flip);
11343788 3717 o = newUNOP(OP_NULL, 0, flop);
79072805 3718 linklist(flop);
1a67a97c 3719 range->op_next = leftstart;
79072805
LW		 3720
3721 left->op_next = flip;
3722 right->op_next = flop;
3723
1a67a97c
SM		 3724 range->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
3725 sv_upgrade(PAD_SV(range->op_targ), SVt_PVNV);
ed6116ce 3726 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 3727 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
3728
3729 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3730 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
3731
11343788 3732 flip->op_next = o;
79072805 3733 if (!flip->op_private || !flop->op_private)
11343788 3734 linklist(o); /* blow off optimizer unless constant */
79072805 3735
11343788 3736 return o;
79072805
LW		 3737}
3738
3739OP *
864dbfa3 3740Perl_newLOOPOP(pTHX_ I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 3741{
463ee0b2 3742 OP* listop;
11343788 3743 OP* o;
73d840c0 3744 const bool once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 3745 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
46c461b5
AL		 3746
3747 PERL_UNUSED_ARG(debuggable);
93a17b20 3748
463ee0b2
LW		 3749 if (expr) {
3750 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
3751 return block; /* do {} while 0 does once */
fb73857a 3752 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3753 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 3754 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3755 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4 3756 } else if (expr->op_flags & OPf_KIDS) {
46c461b5
AL		 3757 const OP * const k1 = ((UNOP*)expr)->op_first;
3758 const OP * const k2 = k1 ? k1->op_sibling : NULL;
55d729e4 3759 switch (expr->op_type) {
1c846c1f 3760 case OP_NULL:
55d729e4
GS		 3761 if (k2 && k2->op_type == OP_READLINE
3762 && (k2->op_flags & OPf_STACKED)
1c846c1f 3763 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
55d729e4 3764 expr = newUNOP(OP_DEFINED, 0, expr);
1c846c1f 3765 break;
55d729e4
GS		 3766
3767 case OP_SASSIGN:
3768 if (k1->op_type == OP_READDIR
3769 || k1->op_type == OP_GLOB
6531c3e6 3770 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
55d729e4
GS		 3771 || k1->op_type == OP_EACH)
3772 expr = newUNOP(OP_DEFINED, 0, expr);
3773 break;
3774 }
774d564b 3775 }
463ee0b2 3776 }
93a17b20 3777
e1548254
RGS		 3778 /* if block is null, the next append_elem() would put UNSTACK, a scalar
3779 * op, in listop. This is wrong. [perl #27024] */
3780 if (!block)
3781 block = newOP(OP_NULL, 0);
8990e307 3782 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 3783 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 3784
883ffac3
CS		 3785 if (listop)
3786 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 3787
11343788
MB		 3788 if (once && o != listop)
3789 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 3790
11343788
MB		 3791 if (o == listop)
3792 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 3793
11343788
MB		 3794 o->op_flags |= flags;
3795 o = scope(o);
3796 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
3797 return o;
79072805
LW		 3798}
3799
3800OP *
a034e688
DM		 3801Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32
3802whileline, OP *expr, OP *block, OP *cont, I32 has_my)
79072805 3803{
27da23d5 3804 dVAR;
79072805
LW		 3805 OP *redo;
3806 OP *next = 0;
3807 OP *listop;
11343788 3808 OP *o;
1ba6ee2b 3809 U8 loopflags = 0;
46c461b5
AL		 3810
3811 PERL_UNUSED_ARG(debuggable);
79072805 3812
fb73857a 3813 if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
3814 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
748a9306 3815 expr = newUNOP(OP_DEFINED, 0,
54b9620d 3816 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4 3817 } else if (expr && (expr->op_flags & OPf_KIDS)) {
46c461b5
AL		 3818 const OP * const k1 = ((UNOP*)expr)->op_first;
3819 const OP * const k2 = (k1) ? k1->op_sibling : NULL;
55d729e4 3820 switch (expr->op_type) {
1c846c1f 3821 case OP_NULL:
55d729e4
GS		 3822 if (k2 && k2->op_type == OP_READLINE
3823 && (k2->op_flags & OPf_STACKED)
1c846c1f 3824 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
55d729e4 3825 expr = newUNOP(OP_DEFINED, 0, expr);
1c846c1f 3826 break;
55d729e4
GS		 3827
3828 case OP_SASSIGN:
3829 if (k1->op_type == OP_READDIR
3830 || k1->op_type == OP_GLOB
72b16652 3831 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
55d729e4
GS		 3832 || k1->op_type == OP_EACH)
3833 expr = newUNOP(OP_DEFINED, 0, expr);
3834 break;
3835 }
748a9306 3836 }
79072805
LW		 3837
3838 if (!block)
3839 block = newOP(OP_NULL, 0);
a034e688 3840 else if (cont || has_my) {
87246558
GS		 3841 block = scope(block);
3842 }
79072805 3843
1ba6ee2b 3844 if (cont) {
79072805 3845 next = LINKLIST(cont);
1ba6ee2b 3846 }
fb73857a 3847 if (expr) {
85538317
GS		 3848 OP *unstack = newOP(OP_UNSTACK, 0);
3849 if (!next)
3850 next = unstack;
3851 cont = append_elem(OP_LINESEQ, cont, unstack);
fb73857a 3852 }
79072805 3853
463ee0b2 3854 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
79072805
LW		 3855 redo = LINKLIST(listop);
3856
3857 if (expr) {
eb160463 3858 PL_copline = (line_t)whileline;
883ffac3
CS		 3859 scalar(listop);
3860 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 3861 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 3862 op_free(expr); /* oops, it's a while (0) */
463ee0b2 3863 op_free((OP*)loop);
883ffac3 3864 return Nullop; /* listop already freed by new_logop */
463ee0b2 3865 }
883ffac3 3866 if (listop)
497b47a8 3867 ((LISTOP*)listop)->op_last->op_next =
883ffac3 3868 (o == listop ? redo : LINKLIST(o));
79072805
LW		 3869 }
3870 else
11343788 3871 o = listop;
79072805
LW		 3872
3873 if (!loop) {
b7dc083c 3874 NewOp(1101,loop,1,LOOP);
79072805 3875 loop->op_type = OP_ENTERLOOP;
22c35a8c 3876 loop->op_ppaddr = PL_ppaddr[OP_ENTERLOOP];
79072805
LW		 3877 loop->op_private = 0;
3878 loop->op_next = (OP*)loop;
3879 }
3880
11343788 3881 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 3882
3883 loop->op_redoop = redo;
11343788 3884 loop->op_lastop = o;
1ba6ee2b 3885 o->op_private |= loopflags;
79072805
LW		 3886
3887 if (next)
3888 loop->op_nextop = next;
3889 else
11343788 3890 loop->op_nextop = o;
79072805 3891
11343788
MB		 3892 o->op_flags |= flags;
3893 o->op_private |= (flags >> 8);
3894 return o;
79072805
LW		 3895}
3896
3897OP *
66a1b24b 3898Perl_newFOROP(pTHX_ I32 flags, char *label, line_t forline, OP *sv, OP *expr, OP *block, OP *cont)
79072805 3899{
27da23d5 3900 dVAR;
79072805 3901 LOOP *loop;
fb73857a 3902 OP *wop;
4bbc6d12 3903 PADOFFSET padoff = 0;
4633a7c4 3904 I32 iterflags = 0;
241416b8 3905 I32 iterpflags = 0;
79072805 3906
79072805 3907 if (sv) {
85e6fe83 3908 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
241416b8 3909 iterpflags = sv->op_private & OPpOUR_INTRO; /* for our $x () */
748a9306 3910 sv->op_type = OP_RV2GV;
22c35a8c 3911 sv->op_ppaddr = PL_ppaddr[OP_RV2GV];
79072805 3912 }
85e6fe83 3913 else if (sv->op_type == OP_PADSV) { /* private variable */
241416b8 3914 iterpflags = sv->op_private & OPpLVAL_INTRO; /* for my $x () */
85e6fe83 3915 padoff = sv->op_targ;
743e66e6 3916 sv->op_targ = 0;
85e6fe83
LW		 3917 op_free(sv);
3918 sv = Nullop;
3919 }
54b9620d
MB		 3920 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
3921 padoff = sv->op_targ;
743e66e6 3922 sv->op_targ = 0;
54b9620d
MB		 3923 iterflags |= OPf_SPECIAL;
3924 op_free(sv);
3925 sv = Nullop;
3926 }
79072805 3927 else
cea2e8a9 3928 Perl_croak(aTHX_ "Can't use %s for loop variable", PL_op_desc[sv->op_type]);
79072805
LW		 3929 }
3930 else {
73d840c0 3931 const I32 offset = pad_findmy("$_");
aabe9514
RGS		 3932 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS(offset) & SVpad_OUR) {
3933 sv = newGVOP(OP_GV, 0, PL_defgv);
3934 }
3935 else {
3936 padoff = offset;
aabe9514 3937 }
79072805 3938 }
5f05dabc 3939 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 3940 expr = mod(force_list(scalar(ref(expr, OP_ITER))), OP_GREPSTART);
4633a7c4
LW		 3941 iterflags |= OPf_STACKED;
3942 }
89ea2908
GA		 3943 else if (expr->op_type == OP_NULL &&
3944 (expr->op_flags & OPf_KIDS) &&
3945 ((BINOP*)expr)->op_first->op_type == OP_FLOP)
3946 {
3947 /* Basically turn for($x..$y) into the same as for($x,$y), but we
3948 * set the STACKED flag to indicate that these values are to be
3949 * treated as min/max values by 'pp_iterinit'.
3950 */
3951 UNOP* flip = (UNOP*)((UNOP*)((BINOP*)expr)->op_first)->op_first;
1a67a97c 3952 LOGOP* range = (LOGOP*) flip->op_first;
66a1b24b
AL		 3953 OP* const left = range->op_first;
3954 OP* const right = left->op_sibling;
5152d7c7 3955 LISTOP* listop;
89ea2908
GA		 3956
3957 range->op_flags &= ~OPf_KIDS;
3958 range->op_first = Nullop;
3959
5152d7c7 3960 listop = (LISTOP*)newLISTOP(OP_LIST, 0, left, right);
1a67a97c
SM		 3961 listop->op_first->op_next = range->op_next;
3962 left->op_next = range->op_other;
5152d7c7
GS		 3963 right->op_next = (OP*)listop;
3964 listop->op_next = listop->op_first;
89ea2908
GA		 3965
3966 op_free(expr);
5152d7c7 3967 expr = (OP*)(listop);
93c66552 3968 op_null(expr);
89ea2908
GA		 3969 iterflags |= OPf_STACKED;
3970 }
3971 else {
3972 expr = mod(force_list(expr), OP_GREPSTART);
3973 }
3974
4633a7c4 3975 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
89ea2908 3976 append_elem(OP_LIST, expr, scalar(sv))));
85e6fe83 3977 assert(!loop->op_next);
241416b8 3978 /* for my $x () sets OPpLVAL_INTRO;
14f338dc 3979 * for our $x () sets OPpOUR_INTRO */
c5661c80 3980 loop->op_private = (U8)iterpflags;
b7dc083c 3981#ifdef PL_OP_SLAB_ALLOC
155aba94
GS		 3982 {
3983 LOOP *tmp;
3984 NewOp(1234,tmp,1,LOOP);
bd5f3bc4 3985 Copy(loop,tmp,1,LISTOP);
238a4c30 3986 FreeOp(loop);
155aba94
GS		 3987 loop = tmp;
3988 }
b7dc083c 3989#else
85e6fe83 3990 Renew(loop, 1, LOOP);
1c846c1f 3991#endif
85e6fe83 3992 loop->op_targ = padoff;
a034e688 3993 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont, 0);
3280af22 3994 PL_copline = forline;
fb73857a 3995 return newSTATEOP(0, label, wop);
79072805
LW		 3996}
3997
8990e307 3998OP*
864dbfa3 3999Perl_newLOOPEX(pTHX_ I32 type, OP *label)
8990e307 4000{
11343788 4001 OP *o;
2d8e6c8d 4002
8990e307 4003 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 4004 /* "last()" means "last" */
4005 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
4006 o = newOP(type, OPf_SPECIAL);
4007 else {
4008 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
8b6b16e7 4009 ? SvPVx_nolen_const(((SVOP*)label)->op_sv)
cdaebead
MB		 4010 : ""));
4011 }
8990e307
LW		 4012 op_free(label);
4013 }
4014 else {
e3aba57a
RGS		 4015 /* Check whether it's going to be a goto &function */
4016 if (label->op_type == OP_ENTERSUB
4017 && !(label->op_flags & OPf_STACKED))
a0d0e21e 4018 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 4019 o = newUNOP(type, OPf_STACKED, label);
8990e307 4020 }
3280af22 4021 PL_hints |= HINT_BLOCK_SCOPE;
11343788 4022 return o;
8990e307
LW		 4023}
4024
7dafbf52
DM		 4025/*
4026=for apidoc cv_undef
4027
4028Clear out all the active components of a CV. This can happen either
4029by an explicit C<undef &foo>, or by the reference count going to zero.
4030In the former case, we keep the CvOUTSIDE pointer, so that any anonymous
4031children can still follow the full lexical scope chain.
4032
4033=cut
4034*/
4035
79072805 4036void
864dbfa3 4037Perl_cv_undef(pTHX_ CV *cv)
79072805 4038{
27da23d5 4039 dVAR;
a636914a 4040#ifdef USE_ITHREADS
35f1c1c7
SB		 4041 if (CvFILE(cv) && !CvXSUB(cv)) {
4042 /* for XSUBs CvFILE point directly to static memory; __FILE__ */
a636914a 4043 Safefree(CvFILE(cv));
a636914a 4044 }
f3e31eb5 4045 CvFILE(cv) = 0;
a636914a
RH		 4046#endif
4047
a0d0e21e
LW		 4048 if (!CvXSUB(cv) && CvROOT(cv)) {
4049 if (CvDEPTH(cv))
cea2e8a9 4050 Perl_croak(aTHX_ "Can't undef active subroutine");
8990e307 4051 ENTER;
a0d0e21e 4052
f3548bdc 4053 PAD_SAVE_SETNULLPAD();
a0d0e21e 4054
282f25c9 4055 op_free(CvROOT(cv));
79072805 4056 CvROOT(cv) = Nullop;
8f476eee 4057 CvSTART(cv) = Nullop;
8990e307 4058 LEAVE;
79072805 4059 }
1d5db326 4060 SvPOK_off((SV*)cv); /* forget prototype */
8e07c86e 4061 CvGV(cv) = Nullgv;
a3985cdc
DM		 4062
4063 pad_undef(cv);
4064
7dafbf52
DM		 4065 /* remove CvOUTSIDE unless this is an undef rather than a free */
4066 if (!SvREFCNT(cv) && CvOUTSIDE(cv)) {
4067 if (!CvWEAKOUTSIDE(cv))
4068 SvREFCNT_dec(CvOUTSIDE(cv));
4069 CvOUTSIDE(cv) = Nullcv;
4070 }
beab0874
JT		 4071 if (CvCONST(cv)) {
4072 SvREFCNT_dec((SV*)CvXSUBANY(cv).any_ptr);
4073 CvCONST_off(cv);
4074 }
50762d59
DM		 4075 if (CvXSUB(cv)) {
4076 CvXSUB(cv) = 0;
4077 }
7dafbf52
DM		 4078 /* delete all flags except WEAKOUTSIDE */
4079 CvFLAGS(cv) &= CVf_WEAKOUTSIDE;
79072805
LW		 4080}
4081
3fe9a6f1 4082void
35a4481c 4083Perl_cv_ckproto(pTHX_ const CV *cv, const GV *gv, const char *p)
3fe9a6f1 4084{
b15aece3 4085 if (((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX_const(cv)))) && ckWARN_d(WARN_PROTOTYPE)) {
46fc3d4c 4086 SV* msg = sv_newmortal();
3fe9a6f1 4087 SV* name = Nullsv;
4088
4089 if (gv)
46fc3d4c 4090 gv_efullname3(name = sv_newmortal(), gv, Nullch);
4091 sv_setpv(msg, "Prototype mismatch:");
4092 if (name)
894356b3 4093 Perl_sv_catpvf(aTHX_ msg, " sub %"SVf, name);
3fe9a6f1 4094 if (SvPOK(cv))
e1ec3a88 4095 Perl_sv_catpvf(aTHX_ msg, " (%"SVf")", (const SV *)cv);
ebe643b9 4096 else
54667de8 4097 Perl_sv_catpv(aTHX_ msg, ": none");
46fc3d4c 4098 sv_catpv(msg, " vs ");
4099 if (p)
cea2e8a9 4100 Perl_sv_catpvf(aTHX_ msg, "(%s)", p);
46fc3d4c 4101 else
4102 sv_catpv(msg, "none");
9014280d 4103 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "%"SVf, msg);
3fe9a6f1 4104 }
4105}
4106
35f1c1c7
SB		 4107static void const_sv_xsub(pTHX_ CV* cv);
4108
beab0874 4109/*
ccfc67b7
JH		 4110
4111=head1 Optree Manipulation Functions
4112
beab0874
JT		 4113=for apidoc cv_const_sv
4114
4115If C<cv> is a constant sub eligible for inlining. returns the constant
4116value returned by the sub. Otherwise, returns NULL.
4117
4118Constant subs can be created with C<newCONSTSUB> or as described in
4119L<perlsub/"Constant Functions">.
4120
4121=cut
4122*/
760ac839 4123SV *
864dbfa3 4124Perl_cv_const_sv(pTHX_ CV *cv)
760ac839 4125{
beab0874 4126 if (!cv || !CvCONST(cv))
54310121 4127 return Nullsv;
beab0874 4128 return (SV*)CvXSUBANY(cv).any_ptr;
fe5e78ed 4129}
760ac839 4130
b5c19bd7
DM		 4131/* op_const_sv: examine an optree to determine whether it's in-lineable.
4132 * Can be called in 3 ways:
4133 *
4134 * !cv
4135 * look for a single OP_CONST with attached value: return the value
4136 *
4137 * cv && CvCLONE(cv) && !CvCONST(cv)
4138 *
4139 * examine the clone prototype, and if contains only a single
4140 * OP_CONST referencing a pad const, or a single PADSV referencing
4141 * an outer lexical, return a non-zero value to indicate the CV is
4142 * a candidate for "constizing" at clone time
4143 *
4144 * cv && CvCONST(cv)
4145 *
4146 * We have just cloned an anon prototype that was marked as a const
4147 * candidiate. Try to grab the current value, and in the case of
4148 * PADSV, ignore it if it has multiple references. Return the value.
4149 */
4150
fe5e78ed 4151SV *
6867be6d 4152Perl_op_const_sv(pTHX_ const OP *o, CV *cv)
fe5e78ed
GS		 4153{
4154 SV *sv = Nullsv;
4155
0f79a09d 4156 if (!o)
fe5e78ed 4157 return Nullsv;
1c846c1f
NIS		 4158
4159 if (o->op_type == OP_LINESEQ && cLISTOPo->op_first)
fe5e78ed
GS		 4160 o = cLISTOPo->op_first->op_sibling;
4161
4162 for (; o; o = o->op_next) {
890ce7af 4163 const OPCODE type = o->op_type;
fe5e78ed 4164
1c846c1f 4165 if (sv && o->op_next == o)
fe5e78ed 4166 return sv;
e576b457
JT		 4167 if (o->op_next != o) {
4168 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
4169 continue;
4170 if (type == OP_DBSTATE)
4171 continue;
4172 }
54310121 4173 if (type == OP_LEAVESUB || type == OP_RETURN)
4174 break;
4175 if (sv)
4176 return Nullsv;
7766f137 4177 if (type == OP_CONST && cSVOPo->op_sv)
5dc0d613 4178 sv = cSVOPo->op_sv;
b5c19bd7 4179 else if (cv && type == OP_CONST) {
dd2155a4 4180 sv = PAD_BASE_SV(CvPADLIST(cv), o->op_targ);
beab0874
JT		 4181 if (!sv)
4182 return Nullsv;
b5c19bd7
DM		 4183 }
4184 else if (cv && type == OP_PADSV) {
4185 if (CvCONST(cv)) { /* newly cloned anon */
4186 sv = PAD_BASE_SV(CvPADLIST(cv), o->op_targ);
4187 /* the candidate should have 1 ref from this pad and 1 ref
4188 * from the parent */
4189 if (!sv || SvREFCNT(sv) != 2)
4190 return Nullsv;
beab0874 4191 sv = newSVsv(sv);
b5c19bd7
DM		 4192 SvREADONLY_on(sv);
4193 return sv;
4194 }
4195 else {
4196 if (PAD_COMPNAME_FLAGS(o->op_targ) & SVf_FAKE)
4197 sv = &PL_sv_undef; /* an arbitrary non-null value */
beab0874 4198 }
760ac839 4199 }
b5c19bd7 4200 else {
54310121 4201 return Nullsv;
b5c19bd7 4202 }
760ac839
LW		 4203 }
4204 return sv;
4205}
4206
09bef843
SB		 4207void
4208Perl_newMYSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
4209{
46c461b5
AL		 4210 PERL_UNUSED_ARG(floor);
4211
09bef843
SB		 4212 if (o)
4213 SAVEFREEOP(o);
4214 if (proto)
4215 SAVEFREEOP(proto);
4216 if (attrs)
4217 SAVEFREEOP(attrs);
4218 if (block)
4219 SAVEFREEOP(block);
4220 Perl_croak(aTHX_ "\"my sub\" not yet implemented");
4221}
4222
748a9306 4223CV *
864dbfa3 4224Perl_newSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *block)
79072805 4225{
09bef843
SB		 4226 return Perl_newATTRSUB(aTHX_ floor, o, proto, Nullop, block);
4227}
4228
4229CV *
4230Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
4231{
27da23d5 4232 dVAR;
6867be6d 4233 const char *aname;
83ee9e09 4234 GV *gv;
5c144d81 4235 const char *ps;
ea6e9374 4236 STRLEN ps_len;
a2008d6d 4237 register CV *cv=0;
beab0874 4238 SV *const_sv;
61dbb99a 4239 I32 gv_fetch_flags;
79072805 4240
8b6b16e7 4241 const char * const name = o ? SvPVx_nolen_const(cSVOPo->op_sv) : Nullch;
8e742a20
MHM		 4242
4243 if (proto) {
4244 assert(proto->op_type == OP_CONST);
5c144d81 4245 ps = SvPVx_const(((SVOP*)proto)->op_sv, ps_len);
8e742a20
MHM		 4246 }
4247 else
4248 ps = Nullch;
4249
83ee9e09 4250 if (!name && PERLDB_NAMEANON && CopLINE(PL_curcop)) {
aec46f14 4251 SV * const sv = sv_newmortal();
c99da370
JH		 4252 Perl_sv_setpvf(aTHX_ sv, "%s[%s:%"IVdf"]",
4253 PL_curstash ? "__ANON__" : "__ANON__::__ANON__",
83ee9e09 4254 CopFILE(PL_curcop), (IV)CopLINE(PL_curcop));
b15aece3 4255 aname = SvPVX_const(sv);
83ee9e09
GS		 4256 }
4257 else
4258 aname = Nullch;
61dbb99a
SF		 4259
4260 gv_fetch_flags = (block || attrs || (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS))
4261 ? GV_ADDMULTI : GV_ADDMULTI | GV_NOINIT;
4262 gv = name ? gv_fetchsv(cSVOPo->op_sv, gv_fetch_flags, SVt_PVCV)
7a5fd60d
NC		 4263 : gv_fetchpv(aname ? aname
4264 : (PL_curstash ? "__ANON__" : "__ANON__::__ANON__"),
61dbb99a 4265 gv_fetch_flags, SVt_PVCV);
83ee9e09 4266
11343788 4267 if (o)
5dc0d613 4268 SAVEFREEOP(o);
3fe9a6f1 4269 if (proto)
4270 SAVEFREEOP(proto);
09bef843
SB		 4271 if (attrs)
4272 SAVEFREEOP(attrs);
3fe9a6f1 4273
09bef843 4274 if (SvTYPE(gv) != SVt_PVGV) { /* Maybe prototype now, and had at
55d729e4
GS		 4275 maximum a prototype before. */
4276 if (SvTYPE(gv) > SVt_NULL) {
0453d815 4277 if (!SvPOK((SV*)gv) && !(SvIOK((SV*)gv) && SvIVX((SV*)gv) == -1)
e476b1b5 4278 && ckWARN_d(WARN_PROTOTYPE))
f248d071 4279 {
9014280d 4280 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "Runaway prototype");
f248d071 4281 }
55d729e4
GS		 4282 cv_ckproto((CV*)gv, NULL, ps);
4283 }
4284 if (ps)
ea6e9374 4285 sv_setpvn((SV*)gv, ps, ps_len);
55d729e4
GS		 4286 else
4287 sv_setiv((SV*)gv, -1);
3280af22
NIS		 4288 SvREFCNT_dec(PL_compcv);
4289 cv = PL_compcv = NULL;
4290 PL_sub_generation++;
beab0874 4291 goto done;
55d729e4
GS		 4292 }
4293
beab0874
JT		 4294 cv = (!name || GvCVGEN(gv)) ? Nullcv : GvCV(gv);
4295
7fb37951
AMS		 4296#ifdef GV_UNIQUE_CHECK
4297 if (cv && GvUNIQUE(gv) && SvREADONLY(cv)) {
4298 Perl_croak(aTHX_ "Can't define subroutine %s (GV is unique)", name);
5bd07a3d
DM		 4299 }
4300#endif
4301
2e8a6c53 4302 if (!block || !ps || *ps || attrs || (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS))
beab0874
JT		 4303 const_sv = Nullsv;
4304 else
4305 const_sv = op_const_sv(block, Nullcv);
4306
4307 if (cv) {
6867be6d 4308 const bool exists = CvROOT(cv) || CvXSUB(cv);
5bd07a3d 4309
7fb37951
AMS		 4310#ifdef GV_UNIQUE_CHECK
4311 if (exists && GvUNIQUE(gv)) {
4312 Perl_croak(aTHX_ "Can't redefine unique subroutine %s", name);
5bd07a3d
DM		 4313 }
4314#endif
4315
60ed1d8c
GS		 4316 /* if the subroutine doesn't exist and wasn't pre-declared
4317 * with a prototype, assume it will be AUTOLOADed,
4318 * skipping the prototype check
4319 */
4320 if (exists || SvPOK(cv))
01ec43d0 4321 cv_ckproto(cv, gv, ps);
68dc0745 4322 /* already defined (or promised)? */
60ed1d8c 4323 if (exists || GvASSUMECV(gv)) {
09bef843 4324 if (!block && !attrs) {
d3cea301
SB		 4325 if (CvFLAGS(PL_compcv)) {
4326 /* might have had built-in attrs applied */
4327 CvFLAGS(cv) |= (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS);
4328 }
aa689395 4329 /* just a "sub foo;" when &foo is already defined */
3280af22 4330 SAVEFREESV(PL_compcv);
aa689395 4331 goto done;
4332 }
7bac28a0 4333 /* ahem, death to those who redefine active sort subs */
3280af22 4334 if (PL_curstackinfo->si_type == PERLSI_SORT && PL_sortcop == CvSTART(cv))
cea2e8a9 4335 Perl_croak(aTHX_ "Can't redefine active sort subroutine %s", name);
beab0874
JT		 4336 if (block) {
4337 if (ckWARN(WARN_REDEFINE)
4338 || (CvCONST(cv)
4339 && (!const_sv || sv_cmp(cv_const_sv(cv), const_sv))))
4340 {
6867be6d 4341 const line_t oldline = CopLINE(PL_curcop);
d8a34499
IK		 4342 if (PL_copline != NOLINE)
4343 CopLINE_set(PL_curcop, PL_copline);
9014280d 4344 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
beab0874
JT		 4345 CvCONST(cv) ? "Constant subroutine %s redefined"
4346 : "Subroutine %s redefined", name);
4347 CopLINE_set(PL_curcop, oldline);
4348 }
4349 SvREFCNT_dec(cv);
4350 cv = Nullcv;
79072805 4351 }
79072805
LW		 4352 }
4353 }
beab0874 4354 if (const_sv) {
7fc63493 4355 (void)SvREFCNT_inc(const_sv);
beab0874 4356 if (cv) {
0768512c 4357 assert(!CvROOT(cv) && !CvCONST(cv));
c69006e4 4358 sv_setpvn((SV*)cv, "", 0); /* prototype is "" */
beab0874
JT		 4359 CvXSUBANY(cv).any_ptr = const_sv;
4360 CvXSUB(cv) = const_sv_xsub;
4361 CvCONST_on(cv);
beab0874
JT		 4362 }
4363 else {
4364 GvCV(gv) = Nullcv;
4365 cv = newCONSTSUB(NULL, name, const_sv);
4366 }
4367 op_free(block);
4368 SvREFCNT_dec(PL_compcv);
4369 PL_compcv = NULL;
4370 PL_sub_generation++;
4371 goto done;
4372 }
09bef843
SB		 4373 if (attrs) {
4374 HV *stash;
4375 SV *rcv;
4376
4377 /* Need to do a C<use attributes $stash_of_cv,\&cv,@attrs>
4378 * before we clobber PL_compcv.
4379 */
4380 if (cv && !block) {
4381 rcv = (SV*)cv;
020f0e03
SB		 4382 /* Might have had built-in attributes applied -- propagate them. */
4383 CvFLAGS(cv) |= (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS);
a9164de8 4384 if (CvGV(cv) && GvSTASH(CvGV(cv)))
09bef843 4385 stash = GvSTASH(CvGV(cv));
a9164de8 4386 else if (CvSTASH(cv))
09bef843
SB		 4387 stash = CvSTASH(cv);
4388 else
4389 stash = PL_curstash;
4390 }
4391 else {
4392 /* possibly about to re-define existing subr -- ignore old cv */
4393 rcv = (SV*)PL_compcv;
a9164de8 4394 if (name && GvSTASH(gv))
09bef843
SB		 4395 stash = GvSTASH(gv);
4396 else
4397 stash = PL_curstash;
4398 }
95f0a2f1 4399 apply_attrs(stash, rcv, attrs, FALSE);
09bef843 4400 }
a0d0e21e 4401 if (cv) { /* must reuse cv if autoloaded */
09bef843
SB		 4402 if (!block) {
4403 /* got here with just attrs -- work done, so bug out */
4404 SAVEFREESV(PL_compcv);
4405 goto done;
4406 }
a3985cdc 4407 /* transfer PL_compcv to cv */
4633a7c4 4408 cv_undef(cv);
3280af22 4409 CvFLAGS(cv) = CvFLAGS(PL_compcv);
5c41a5fa
DM		 4410 if (!CvWEAKOUTSIDE(cv))
4411 SvREFCNT_dec(CvOUTSIDE(cv));
3280af22 4412 CvOUTSIDE(cv) = CvOUTSIDE(PL_compcv);
a3985cdc 4413 CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(PL_compcv);
3280af22
NIS		 4414 CvOUTSIDE(PL_compcv) = 0;
4415 CvPADLIST(cv) = CvPADLIST(PL_compcv);
4416 CvPADLIST(PL_compcv) = 0;
282f25c9 4417 /* inner references to PL_compcv must be fixed up ... */
dd2155a4 4418 pad_fixup_inner_anons(CvPADLIST(cv), PL_compcv, cv);
282f25c9 4419 /* ... before we throw it away */
3280af22 4420 SvREFCNT_dec(PL_compcv);
b5c19bd7 4421 PL_compcv = cv;
a933f601
IZ		 4422 if (PERLDB_INTER)/* Advice debugger on the new sub. */
4423 ++PL_sub_generation;
a0d0e21e
LW		 4424 }
4425 else {
3280af22 4426 cv = PL_compcv;
44a8e56a 4427 if (name) {
4428 GvCV(gv) = cv;
4429 GvCVGEN(gv) = 0;
3280af22 4430 PL_sub_generation++;
44a8e56a 4431 }
a0d0e21e 4432 }
65c50114 4433 CvGV(cv) = gv;
a636914a 4434 CvFILE_set_from_cop(cv, PL_curcop);
3280af22 4435 CvSTASH(cv) = PL_curstash;
8990e307 4436
3fe9a6f1 4437 if (ps)
ea6e9374 4438 sv_setpvn((SV*)cv, ps, ps_len);
4633a7c4 4439
3280af22 4440 if (PL_error_count) {
c07a80fd 4441 op_free(block);
4442 block = Nullop;
68dc0745 4443 if (name) {
6867be6d 4444 const char *s = strrchr(name, ':');
68dc0745 4445 s = s ? s+1 : name;
6d4c2119 4446 if (strEQ(s, "BEGIN")) {
e1ec3a88 4447 const char not_safe[] =
6d4c2119 4448 "BEGIN not safe after errors--compilation aborted";
faef0170 4449 if (PL_in_eval & EVAL_KEEPERR)
cea2e8a9 4450 Perl_croak(aTHX_ not_safe);
6d4c2119
CS		 4451 else {
4452 /* force display of errors found but not reported */
38a03e6e 4453 sv_catpv(ERRSV, not_safe);
35c1215d 4454 Perl_croak(aTHX_ "%"SVf, ERRSV);
6d4c2119
CS		 4455 }
4456 }
68dc0745 4457 }
c07a80fd 4458 }
beab0874
JT		 4459 if (!block)
4460 goto done;
a0d0e21e 4461
7766f137 4462 if (CvLVALUE(cv)) {
78f9721b
SM		 4463 CvROOT(cv) = newUNOP(OP_LEAVESUBLV, 0,
4464 mod(scalarseq(block), OP_LEAVESUBLV));
7766f137
GS		 4465 }
4466 else {
09c2fd24
AE		 4467 /* This makes sub {}; work as expected. */
4468 if (block->op_type == OP_STUB) {
4469 op_free(block);
4470 block = newSTATEOP(0, Nullch, 0);
4471 }
7766f137
GS		 4472 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
4473 }
4474 CvROOT(cv)->op_private |= OPpREFCOUNTED;
4475 OpREFCNT_set(CvROOT(cv), 1);
4476 CvSTART(cv) = LINKLIST(CvROOT(cv));
4477 CvROOT(cv)->op_next = 0;
a2efc822 4478 CALL_PEEP(CvSTART(cv));
7766f137
GS		 4479
4480 /* now that optimizer has done its work, adjust pad values */
54310121 4481
dd2155a4
DM		 4482 pad_tidy(CvCLONE(cv) ? padtidy_SUBCLONE : padtidy_SUB);
4483
4484 if (CvCLONE(cv)) {
beab0874
JT		 4485 assert(!CvCONST(cv));
4486 if (ps && !*ps && op_const_sv(block, cv))
4487 CvCONST_on(cv);
a0d0e21e 4488 }
79072805 4489
83ee9e09 4490 if (name || aname) {
6867be6d
AL		 4491 const char *s;
4492 const char *tname = (name ? name : aname);
44a8e56a 4493
3280af22 4494 if (PERLDB_SUBLINE && PL_curstash != PL_debstash) {
46fc3d4c 4495 SV *sv = NEWSV(0,0);
44a8e56a 4496 SV *tmpstr = sv_newmortal();
549bb64a 4497 GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
83ee9e09 4498 CV *pcv;
44a8e56a 4499 HV *hv;
4500
ed094faf
GS		 4501 Perl_sv_setpvf(aTHX_ sv, "%s:%ld-%ld",
4502 CopFILE(PL_curcop),
cc49e20b 4503 (long)PL_subline, (long)CopLINE(PL_curcop));
44a8e56a 4504 gv_efullname3(tmpstr, gv, Nullch);
b15aece3 4505 hv_store(GvHV(PL_DBsub), SvPVX_const(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 4506 hv = GvHVn(db_postponed);
b15aece3 4507 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX_const(tmpstr), SvCUR(tmpstr))
83ee9e09
GS		 4508 && (pcv = GvCV(db_postponed)))
4509 {
44a8e56a 4510 dSP;
924508f0 4511 PUSHMARK(SP);
44a8e56a 4512 XPUSHs(tmpstr);
4513 PUTBACK;
83ee9e09 4514 call_sv((SV*)pcv, G_DISCARD);
44a8e56a 4515 }
4516 }
79072805 4517
83ee9e09 4518 if ((s = strrchr(tname,':')))
28757baa 4519 s++;
4520 else
83ee9e09 4521 s = tname;
ed094faf 4522
7d30b5c4 4523 if (*s != 'B' && *s != 'E' && *s != 'C' && *s != 'I')
ed094faf
GS		 4524 goto done;
4525
7678c486 4526 if (strEQ(s, "BEGIN") && !PL_error_count) {
6867be6d 4527 const I32 oldscope = PL_scopestack_ix;
28757baa 4528 ENTER;
57843af0
GS		 4529 SAVECOPFILE(&PL_compiling);
4530 SAVECOPLINE(&PL_compiling);
28757baa 4531
3280af22
NIS		 4532 if (!PL_beginav)
4533 PL_beginav = newAV();
28757baa 4534 DEBUG_x( dump_sub(gv) );
ea2f84a3
GS		 4535 av_push(PL_beginav, (SV*)cv);
4536 GvCV(gv) = 0; /* cv has been hijacked */
3280af22 4537 call_list(oldscope, PL_beginav);
a6006777 4538
3280af22 4539 PL_curcop = &PL_compiling;
eb160463 4540 PL_compiling.op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
28757baa 4541 LEAVE;
4542 }
3280af22
NIS		 4543 else if (strEQ(s, "END") && !PL_error_count) {
4544 if (!PL_endav)
4545 PL_endav = newAV();
ed094faf 4546 DEBUG_x( dump_sub(gv) );
3280af22 4547 av_unshift(PL_endav, 1);
ea2f84a3
GS		 4548 av_store(PL_endav, 0, (SV*)cv);
4549 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 4550 }
7d30b5c4
GS		 4551 else if (strEQ(s, "CHECK") && !PL_error_count) {
4552 if (!PL_checkav)
4553 PL_checkav = newAV();
ed094faf 4554 DEBUG_x( dump_sub(gv) );
ddda08b7 4555 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4556 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run CHECK block");
7d30b5c4 4557 av_unshift(PL_checkav, 1);
ea2f84a3
GS		 4558 av_store(PL_checkav, 0, (SV*)cv);
4559 GvCV(gv) = 0; /* cv has been hijacked */
4f25aa18 4560 }
3280af22
NIS		 4561 else if (strEQ(s, "INIT") && !PL_error_count) {
4562 if (!PL_initav)
4563 PL_initav = newAV();
ed094faf 4564 DEBUG_x( dump_sub(gv) );
ddda08b7 4565 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4566 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run INIT block");
ea2f84a3
GS		 4567 av_push(PL_initav, (SV*)cv);
4568 GvCV(gv) = 0; /* cv has been hijacked */
ae77835f 4569 }
79072805 4570 }
a6006777 4571
aa689395 4572 done:
3280af22 4573 PL_copline = NOLINE;
8990e307 4574 LEAVE_SCOPE(floor);
a0d0e21e 4575 return cv;
79072805
LW		 4576}
4577
b099ddc0 4578/* XXX unsafe for threads if eval_owner isn't held */
954c1994
GS		 4579/*
4580=for apidoc newCONSTSUB
4581
4582Creates a constant sub equivalent to Perl C<sub FOO () { 123 }> which is
4583eligible for inlining at compile-time.
4584
4585=cut
4586*/
4587
beab0874 4588CV *
e1ec3a88 4589Perl_newCONSTSUB(pTHX_ HV *stash, const char *name, SV *sv)
5476c433 4590{
27da23d5 4591 dVAR;
beab0874 4592 CV* cv;
5476c433 4593
11faa288 4594 ENTER;
11faa288 4595
f4dd75d9 4596 SAVECOPLINE(PL_curcop);
11faa288 4597 CopLINE_set(PL_curcop, PL_copline);
f4dd75d9
GS		 4598
4599 SAVEHINTS();
3280af22 4600 PL_hints &= ~HINT_BLOCK_SCOPE;
11faa288
GS		 4601
4602 if (stash) {
4603 SAVESPTR(PL_curstash);
4604 SAVECOPSTASH(PL_curcop);
4605 PL_curstash = stash;
05ec9bb3 4606 CopSTASH_set(PL_curcop,stash);
11faa288 4607 }
5476c433 4608
91a15d0d 4609 cv = newXS(name, const_sv_xsub, savepv(CopFILE(PL_curcop)));
beab0874
JT		 4610 CvXSUBANY(cv).any_ptr = sv;
4611 CvCONST_on(cv);
c69006e4 4612 sv_setpvn((SV*)cv, "", 0); /* prototype is "" */
5476c433 4613
02f28d44
MHM		 4614 if (stash)
4615 CopSTASH_free(PL_curcop);
4616
11faa288 4617 LEAVE;
beab0874
JT		 4618
4619 return cv;
5476c433
JD		 4620}
4621
954c1994
GS		 4622/*
4623=for apidoc U||newXS
4624
4625Used by C<xsubpp> to hook up XSUBs as Perl subs.
4626
4627=cut
4628*/
4629
57d3b86d 4630CV *
bfed75c6 4631Perl_newXS(pTHX_ const char *name, XSUBADDR_t subaddr, const char *filename)
a0d0e21e 4632{
9a957fbc 4633 GV * const gv = gv_fetchpv(name ? name :
c99da370
JH		 4634 (PL_curstash ? "__ANON__" : "__ANON__::__ANON__"),
4635 GV_ADDMULTI, SVt_PVCV);
79072805 4636 register CV *cv;
44a8e56a 4637
1ecdd9a8
HS		 4638 if (!subaddr)
4639 Perl_croak(aTHX_ "panic: no address for '%s' in '%s'", name, filename);
4640
155aba94 4641 if ((cv = (name ? GvCV(gv) : Nullcv))) {
44a8e56a 4642 if (GvCVGEN(gv)) {
4643 /* just a cached method */
4644 SvREFCNT_dec(cv);
66a1b24b 4645 cv = Nullcv;
44a8e56a 4646 }
4647 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
4648 /* already defined (or promised) */
1df70142 4649 /* XXX It's possible for this HvNAME_get to return null, and get passed into strEQ */
66a1b24b
AL		 4650 if (ckWARN(WARN_REDEFINE)) {
4651 GV * const gvcv = CvGV(cv);
4652 if (gvcv) {
4653 HV * const stash = GvSTASH(gvcv);
4654 if (stash) {
4655 const char *name = HvNAME_get(stash);
4656 if ( strEQ(name,"autouse") ) {
4657 const line_t oldline = CopLINE(PL_curcop);
4658 if (PL_copline != NOLINE)
4659 CopLINE_set(PL_curcop, PL_copline);
4660 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
4661 CvCONST(cv) ? "Constant subroutine %s redefined"
4662 : "Subroutine %s redefined"
4663 ,name);
4664 CopLINE_set(PL_curcop, oldline);
4665 }
4666 }
4667 }
a0d0e21e
LW		 4668 }
4669 SvREFCNT_dec(cv);
66a1b24b 4670 cv = Nullcv;
79072805 4671 }
79072805 4672 }
44a8e56a 4673
4674 if (cv) /* must reuse cv if autoloaded */
4675 cv_undef(cv);
a0d0e21e
LW		 4676 else {
4677 cv = (CV*)NEWSV(1105,0);
4678 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 4679 if (name) {
4680 GvCV(gv) = cv;
4681 GvCVGEN(gv) = 0;
3280af22 4682 PL_sub_generation++;
44a8e56a 4683 }
a0d0e21e 4684 }
65c50114 4685 CvGV(cv) = gv;
b195d487 4686 (void)gv_fetchfile(filename);
dd374669 4687 CvFILE(cv) = (char *)filename; /* NOTE: not copied, as it is expected to be
57843af0 4688 an external constant string */
a0d0e21e 4689 CvXSUB(cv) = subaddr;
44a8e56a 4690
28757baa 4691 if (name) {
e1ec3a88 4692 const char *s = strrchr(name,':');
28757baa 4693 if (s)
4694 s++;
4695 else
4696 s = name;
ed094faf 4697
7d30b5c4 4698 if (*s != 'B' && *s != 'E' && *s != 'C' && *s != 'I')
ed094faf
GS		 4699 goto done;
4700
28757baa 4701 if (strEQ(s, "BEGIN")) {
3280af22
NIS		 4702 if (!PL_beginav)
4703 PL_beginav = newAV();
ea2f84a3
GS		 4704 av_push(PL_beginav, (SV*)cv);
4705 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 4706 }
4707 else if (strEQ(s, "END")) {
3280af22
NIS		 4708 if (!PL_endav)
4709 PL_endav = newAV();
4710 av_unshift(PL_endav, 1);
ea2f84a3
GS		 4711 av_store(PL_endav, 0, (SV*)cv);
4712 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 4713 }
7d30b5c4
GS		 4714 else if (strEQ(s, "CHECK")) {
4715 if (!PL_checkav)
4716 PL_checkav = newAV();
ddda08b7 4717 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4718 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run CHECK block");
7d30b5c4 4719 av_unshift(PL_checkav, 1);
ea2f84a3
GS		 4720 av_store(PL_checkav, 0, (SV*)cv);
4721 GvCV(gv) = 0; /* cv has been hijacked */
4f25aa18 4722 }
7d07dbc2 4723 else if (strEQ(s, "INIT")) {
3280af22
NIS		 4724 if (!PL_initav)
4725 PL_initav = newAV();
ddda08b7 4726 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 4727 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run INIT block");
ea2f84a3
GS		 4728 av_push(PL_initav, (SV*)cv);
4729 GvCV(gv) = 0; /* cv has been hijacked */
ae77835f 4730 }
28757baa 4731 }
8990e307 4732 else
a5f75d66 4733 CvANON_on(cv);
44a8e56a 4734
ed094faf 4735done:
a0d0e21e 4736 return cv;
79072805
LW		 4737}
4738
4739void
864dbfa3 4740Perl_newFORM(pTHX_ I32 floor, OP *o, OP *block)
79072805
LW		 4741{
4742 register CV *cv;
79072805 4743 GV *gv;
79072805 4744
11343788 4745 if (o)
7a5fd60d 4746 gv = gv_fetchsv(cSVOPo->op_sv, TRUE, SVt_PVFM);
79072805 4747 else
7a5fd60d
NC		 4748 gv = gv_fetchpv("STDOUT", TRUE, SVt_PVFM);
4749
7fb37951
AMS		 4750#ifdef GV_UNIQUE_CHECK
4751 if (GvUNIQUE(gv)) {
4752 Perl_croak(aTHX_ "Bad symbol for form (GV is unique)");
5bd07a3d
DM		 4753 }
4754#endif
a5f75d66 4755 GvMULTI_on(gv);
155aba94 4756 if ((cv = GvFORM(gv))) {
599cee73 4757 if (ckWARN(WARN_REDEFINE)) {
6867be6d 4758 const line_t oldline = CopLINE(PL_curcop);
d8a34499
IK		 4759 if (PL_copline != NOLINE)
4760 CopLINE_set(PL_curcop, PL_copline);
7a5fd60d
NC		 4761 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
4762 o ? "Format %"SVf" redefined"
4763 : "Format STDOUT redefined" ,cSVOPo->op_sv);
57843af0 4764 CopLINE_set(PL_curcop, oldline);
79072805 4765 }
8990e307 4766 SvREFCNT_dec(cv);
79072805 4767 }
3280af22 4768 cv = PL_compcv;
79072805 4769 GvFORM(gv) = cv;
65c50114 4770 CvGV(cv) = gv;
a636914a 4771 CvFILE_set_from_cop(cv, PL_curcop);
79072805 4772
a0d0e21e 4773
dd2155a4 4774 pad_tidy(padtidy_FORMAT);
79072805 4775 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
7934575e
GS		 4776 CvROOT(cv)->op_private |= OPpREFCOUNTED;
4777 OpREFCNT_set(CvROOT(cv), 1);
79072805
LW		 4778 CvSTART(cv) = LINKLIST(CvROOT(cv));
4779 CvROOT(cv)->op_next = 0;
a2efc822 4780 CALL_PEEP(CvSTART(cv));
11343788 4781 op_free(o);
3280af22 4782 PL_copline = NOLINE;
8990e307 4783 LEAVE_SCOPE(floor);
79072805
LW		 4784}
4785
4786OP *
864dbfa3 4787Perl_newANONLIST(pTHX_ OP *o)
79072805 4788{
93a17b20 4789 return newUNOP(OP_REFGEN, 0,
11343788 4790 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 4791}
4792
4793OP *
864dbfa3 4794Perl_newANONHASH(pTHX_ OP *o)
79072805 4795{
93a17b20 4796 return newUNOP(OP_REFGEN, 0,
11343788 4797 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 4798}
4799
4800OP *
864dbfa3 4801Perl_newANONSUB(pTHX_ I32 floor, OP *proto, OP *block)
a0d0e21e 4802{
09bef843
SB		 4803 return newANONATTRSUB(floor, proto, Nullop, block);
4804}
4805
4806OP *
4807Perl_newANONATTRSUB(pTHX_ I32 floor, OP *proto, OP *attrs, OP *block)
4808{
a0d0e21e 4809 return newUNOP(OP_REFGEN, 0,
09bef843
SB		 4810 newSVOP(OP_ANONCODE, 0,
4811 (SV*)newATTRSUB(floor, 0, proto, attrs, block)));
79072805
LW		 4812}
4813
4814OP *
864dbfa3 4815Perl_oopsAV(pTHX_ OP *o)
79072805 4816{
27da23d5 4817 dVAR;
ed6116ce
LW		 4818 switch (o->op_type) {
4819 case OP_PADSV:
4820 o->op_type = OP_PADAV;
22c35a8c 4821 o->op_ppaddr = PL_ppaddr[OP_PADAV];
51e247a3 4822 return ref(o, OP_RV2AV);
b2ffa427 4823
ed6116ce 4824 case OP_RV2SV:
79072805 4825 o->op_type = OP_RV2AV;
22c35a8c 4826 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 4827 ref(o, OP_RV2AV);
ed6116ce
LW		 4828 break;
4829
4830 default:
0453d815 4831 if (ckWARN_d(WARN_INTERNAL))
9014280d 4832 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "oops: oopsAV");
ed6116ce
LW		 4833 break;
4834 }
79072805
LW		 4835 return o;
4836}
4837
4838OP *
864dbfa3 4839Perl_oopsHV(pTHX_ OP *o)
79072805 4840{
27da23d5 4841 dVAR;
ed6116ce
LW		 4842 switch (o->op_type) {
4843 case OP_PADSV:
4844 case OP_PADAV:
4845 o->op_type = OP_PADHV;
22c35a8c 4846 o->op_ppaddr = PL_ppaddr[OP_PADHV];
51e247a3 4847 return ref(o, OP_RV2HV);
ed6116ce
LW		 4848
4849 case OP_RV2SV:
4850 case OP_RV2AV:
79072805 4851 o->op_type = OP_RV2HV;
22c35a8c 4852 o->op_ppaddr = PL_ppaddr[OP_RV2HV];
79072805 4853 ref(o, OP_RV2HV);
ed6116ce
LW		 4854 break;
4855
4856 default:
0453d815 4857 if (ckWARN_d(WARN_INTERNAL))
9014280d 4858 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "oops: oopsHV");
ed6116ce
LW		 4859 break;
4860 }
79072805
LW		 4861 return o;
4862}
4863
4864OP *
864dbfa3 4865Perl_newAVREF(pTHX_ OP *o)
79072805 4866{
27da23d5 4867 dVAR;
ed6116ce
LW		 4868 if (o->op_type == OP_PADANY) {
4869 o->op_type = OP_PADAV;
22c35a8c 4870 o->op_ppaddr = PL_ppaddr[OP_PADAV];
93a17b20 4871 return o;
ed6116ce 4872 }
a1063b2d 4873 else if ((o->op_type == OP_RV2AV || o->op_type == OP_PADAV)
9014280d
PM		 4874 && ckWARN(WARN_DEPRECATED)) {
4875 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
a1063b2d
RH		 4876 "Using an array as a reference is deprecated");
4877 }
79072805
LW		 4878 return newUNOP(OP_RV2AV, 0, scalar(o));
4879}
4880
4881OP *
864dbfa3 4882Perl_newGVREF(pTHX_ I32 type, OP *o)
79072805 4883{
82092f1d 4884 if (type == OP_MAPSTART || type == OP_GREPSTART || type == OP_SORT)
a0d0e21e 4885 return newUNOP(OP_NULL, 0, o);
748a9306 4886 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 4887}
4888
4889OP *
864dbfa3 4890Perl_newHVREF(pTHX_ OP *o)
79072805 4891{
27da23d5 4892 dVAR;
ed6116ce
LW		 4893 if (o->op_type == OP_PADANY) {
4894 o->op_type = OP_PADHV;
22c35a8c 4895 o->op_ppaddr = PL_ppaddr[OP_PADHV];
93a17b20 4896 return o;
ed6116ce 4897 }
a1063b2d 4898 else if ((o->op_type == OP_RV2HV || o->op_type == OP_PADHV)
9014280d
PM		 4899 && ckWARN(WARN_DEPRECATED)) {
4900 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
a1063b2d
RH		 4901 "Using a hash as a reference is deprecated");
4902 }
79072805
LW		 4903 return newUNOP(OP_RV2HV, 0, scalar(o));
4904}
4905
4906OP *
864dbfa3 4907Perl_oopsCV(pTHX_ OP *o)
79072805 4908{
cea2e8a9 4909 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805 4910 /* STUB */
46c461b5 4911 PERL_UNUSED_ARG(o);
0dbb1585 4912 NORETURN_FUNCTION_END;
79072805
LW		 4913}
4914
4915OP *
864dbfa3 4916Perl_newCVREF(pTHX_ I32 flags, OP *o)
79072805 4917{
c07a80fd 4918 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 4919}
4920
4921OP *
864dbfa3 4922Perl_newSVREF(pTHX_ OP *o)
79072805 4923{
27da23d5 4924 dVAR;
ed6116ce
LW		 4925 if (o->op_type == OP_PADANY) {
4926 o->op_type = OP_PADSV;
22c35a8c 4927 o->op_ppaddr = PL_ppaddr[OP_PADSV];
93a17b20 4928 return o;
ed6116ce 4929 }
224a4551
MB		 4930 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
4931 o->op_flags |= OPpDONE_SVREF;
a863c7d1 4932 return o;
224a4551 4933 }
79072805
LW		 4934 return newUNOP(OP_RV2SV, 0, scalar(o));
4935}
4936
61b743bb
DM		 4937/* Check routines. See the comments at the top of this file for details
4938 * on when these are called */
79072805
LW		 4939
4940OP *
cea2e8a9 4941Perl_ck_anoncode(pTHX_ OP *o)
5f05dabc 4942{
dd2155a4 4943 cSVOPo->op_targ = pad_add_anon(cSVOPo->op_sv, o->op_type);
5dc0d613 4944 cSVOPo->op_sv = Nullsv;
5dc0d613 4945 return o;
5f05dabc 4946}
4947
4948OP *
cea2e8a9 4949Perl_ck_bitop(pTHX_ OP *o)
55497cff 4950{
276b2a0c
RGS		 4951#define OP_IS_NUMCOMPARE(op) \
4952 ((op) == OP_LT || (op) == OP_I_LT || \
4953 (op) == OP_GT || (op) == OP_I_GT || \
4954 (op) == OP_LE || (op) == OP_I_LE || \
4955 (op) == OP_GE || (op) == OP_I_GE || \
4956 (op) == OP_EQ || (op) == OP_I_EQ || \
4957 (op) == OP_NE || (op) == OP_I_NE || \
4958 (op) == OP_NCMP || (op) == OP_I_NCMP)
eb160463 4959 o->op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
2b84528b
RGS		 4960 if (!(o->op_flags & OPf_STACKED) /* Not an assignment */
4961 && (o->op_type == OP_BIT_OR
4962 || o->op_type == OP_BIT_AND
4963 || o->op_type == OP_BIT_XOR))
276b2a0c 4964 {
1df70142
AL		 4965 const OP * const left = cBINOPo->op_first;
4966 const OP * const right = left->op_sibling;
96a925ab
YST		 4967 if ((OP_IS_NUMCOMPARE(left->op_type) &&
4968 (left->op_flags & OPf_PARENS) == 0) ||
4969 (OP_IS_NUMCOMPARE(right->op_type) &&
4970 (right->op_flags & OPf_PARENS) == 0))
276b2a0c
RGS		 4971 if (ckWARN(WARN_PRECEDENCE))
4972 Perl_warner(aTHX_ packWARN(WARN_PRECEDENCE),
4973 "Possible precedence problem on bitwise %c operator",
4974 o->op_type == OP_BIT_OR ? '|'
4975 : o->op_type == OP_BIT_AND ? '&' : '^'
4976 );
4977 }
5dc0d613 4978 return o;
55497cff 4979}
4980
4981OP *
cea2e8a9 4982Perl_ck_concat(pTHX_ OP *o)
79072805 4983{
6867be6d 4984 const OP *kid = cUNOPo->op_first;
df91b2c5
AE		 4985 if (kid->op_type == OP_CONCAT && !(kid->op_private & OPpTARGET_MY) &&
4986 !(kUNOP->op_first->op_flags & OPf_MOD))
0165acc7 4987 o->op_flags |= OPf_STACKED;
11343788 4988 return o;
79072805
LW		 4989}
4990
4991OP *
cea2e8a9 4992Perl_ck_spair(pTHX_ OP *o)
79072805 4993{
27da23d5 4994 dVAR;
11343788 4995 if (o->op_flags & OPf_KIDS) {
79072805 4996 OP* newop;
a0d0e21e 4997 OP* kid;
6867be6d 4998 const OPCODE type = o->op_type;
5dc0d613 4999 o = modkids(ck_fun(o), type);
11343788 5000 kid = cUNOPo->op_first;
a0d0e21e
LW		 5001 newop = kUNOP->op_first->op_sibling;
5002 if (newop &&
5003 (newop->op_sibling ||
22c35a8c 5004 !(PL_opargs[newop->op_type] & OA_RETSCALAR) ||
a0d0e21e
LW		 5005 newop->op_type == OP_PADAV || newop->op_type == OP_PADHV ||
5006 newop->op_type == OP_RV2AV || newop->op_type == OP_RV2HV)) {
b2ffa427 5007
11343788 5008 return o;
a0d0e21e
LW		 5009 }
5010 op_free(kUNOP->op_first);
5011 kUNOP->op_first = newop;
5012 }
22c35a8c 5013 o->op_ppaddr = PL_ppaddr[++o->op_type];
11343788 5014 return ck_fun(o);
a0d0e21e
LW		 5015}
5016
5017OP *
cea2e8a9 5018Perl_ck_delete(pTHX_ OP *o)
a0d0e21e 5019{
11343788 5020 o = ck_fun(o);
5dc0d613 5021 o->op_private = 0;
11343788
MB		 5022 if (o->op_flags & OPf_KIDS) {
5023 OP *kid = cUNOPo->op_first;
01020589
GS		 5024 switch (kid->op_type) {
5025 case OP_ASLICE:
5026 o->op_flags |= OPf_SPECIAL;
5027 /* FALL THROUGH */
5028 case OP_HSLICE:
5dc0d613 5029 o->op_private |= OPpSLICE;
01020589
GS		 5030 break;
5031 case OP_AELEM:
5032 o->op_flags |= OPf_SPECIAL;
5033 /* FALL THROUGH */
5034 case OP_HELEM:
5035 break;
5036 default:
5037 Perl_croak(aTHX_ "%s argument is not a HASH or ARRAY element or slice",
53e06cf0 5038 OP_DESC(o));
01020589 5039 }
93c66552 5040 op_null(kid);
79072805 5041 }
11343788 5042 return o;
79072805
LW		 5043}
5044
5045OP *
96e176bf
CL		 5046Perl_ck_die(pTHX_ OP *o)
5047{
5048#ifdef VMS
5049 if (VMSISH_HUSHED) o->op_private |= OPpHUSH_VMSISH;
5050#endif
5051 return ck_fun(o);
5052}
5053
5054OP *
cea2e8a9 5055Perl_ck_eof(pTHX_ OP *o)
79072805 5056{
6867be6d 5057 const I32 type = o->op_type;
79072805 5058
11343788
MB		 5059 if (o->op_flags & OPf_KIDS) {
5060 if (cLISTOPo->op_first->op_type == OP_STUB) {
5061 op_free(o);
8fde6460 5062 o = newUNOP(type, OPf_SPECIAL, newGVOP(OP_GV, 0, PL_argvgv));
8990e307 5063 }
11343788 5064 return ck_fun(o);
79072805 5065 }
11343788 5066 return o;
79072805
LW		 5067}
5068
5069OP *
cea2e8a9 5070Perl_ck_eval(pTHX_ OP *o)
79072805 5071{
27da23d5 5072 dVAR;
3280af22 5073 PL_hints |= HINT_BLOCK_SCOPE;
11343788 5074 if (o->op_flags & OPf_KIDS) {
46c461b5 5075 SVOP * const kid = (SVOP*)cUNOPo->op_first;
79072805 5076
93a17b20 5077 if (!kid) {
11343788 5078 o->op_flags &= ~OPf_KIDS;
93c66552 5079 op_null(o);
79072805 5080 }
b14574b4 5081 else if (kid->op_type == OP_LINESEQ || kid->op_type == OP_STUB) {
79072805
LW		 5082 LOGOP *enter;
5083
11343788
MB		 5084 cUNOPo->op_first = 0;
5085 op_free(o);
79072805 5086
b7dc083c 5087 NewOp(1101, enter, 1, LOGOP);
79072805 5088 enter->op_type = OP_ENTERTRY;
22c35a8c 5089 enter->op_ppaddr = PL_ppaddr[OP_ENTERTRY];
79072805
LW		 5090 enter->op_private = 0;
5091
5092 /* establish postfix order */
5093 enter->op_next = (OP*)enter;
5094
11343788
MB		 5095 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
5096 o->op_type = OP_LEAVETRY;
22c35a8c 5097 o->op_ppaddr = PL_ppaddr[OP_LEAVETRY];
11343788
MB		 5098 enter->op_other = o;
5099 return o;
79072805 5100 }
b5c19bd7 5101 else {
473986ff 5102 scalar((OP*)kid);
b5c19bd7
DM		 5103 PL_cv_has_eval = 1;
5104 }
79072805
LW		 5105 }
5106 else {
11343788 5107 op_free(o);
54b9620d 5108 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
79072805 5109 }
3280af22 5110 o->op_targ = (PADOFFSET)PL_hints;
11343788 5111 return o;
79072805
LW		 5112}
5113
5114OP *
d98f61e7
GS		 5115Perl_ck_exit(pTHX_ OP *o)
5116{
5117#ifdef VMS
5118 HV *table = GvHV(PL_hintgv);
5119 if (table) {
5120 SV **svp = hv_fetch(table, "vmsish_exit", 11, FALSE);
5121 if (svp && *svp && SvTRUE(*svp))
5122 o->op_private |= OPpEXIT_VMSISH;
5123 }
96e176bf 5124 if (VMSISH_HUSHED) o->op_private |= OPpHUSH_VMSISH;
d98f61e7
GS		 5125#endif
5126 return ck_fun(o);
5127}
5128
5129OP *
cea2e8a9 5130Perl_ck_exec(pTHX_ OP *o)
79072805 5131{
11343788 5132 if (o->op_flags & OPf_STACKED) {
6867be6d 5133 OP *kid;
11343788
MB		 5134 o = ck_fun(o);
5135 kid = cUNOPo->op_first->op_sibling;
8990e307 5136 if (kid->op_type == OP_RV2GV)
93c66552 5137 op_null(kid);
79072805 5138 }
463ee0b2 5139 else
11343788
MB		 5140 o = listkids(o);
5141 return o;
79072805
LW		 5142}
5143
5144OP *
cea2e8a9 5145Perl_ck_exists(pTHX_ OP *o)
5f05dabc 5146{
5196be3e
MB		 5147 o = ck_fun(o);
5148 if (o->op_flags & OPf_KIDS) {
46c461b5 5149 OP * const kid = cUNOPo->op_first;
afebc493
GS		 5150 if (kid->op_type == OP_ENTERSUB) {
5151 (void) ref(kid, o->op_type);
5152 if (kid->op_type != OP_RV2CV && !PL_error_count)
5153 Perl_croak(aTHX_ "%s argument is not a subroutine name",
53e06cf0 5154 OP_DESC(o));
afebc493
GS		 5155 o->op_private |= OPpEXISTS_SUB;
5156 }
5157 else if (kid->op_type == OP_AELEM)
01020589
GS		 5158 o->op_flags |= OPf_SPECIAL;
5159 else if (kid->op_type != OP_HELEM)
5160 Perl_croak(aTHX_ "%s argument is not a HASH or ARRAY element",
53e06cf0 5161 OP_DESC(o));
93c66552 5162 op_null(kid);
5f05dabc 5163 }
5196be3e 5164 return o;
5f05dabc 5165}
5166
79072805 5167OP *
cea2e8a9 5168Perl_ck_rvconst(pTHX_ register OP *o)
79072805 5169{
27da23d5 5170 dVAR;
11343788 5171 SVOP *kid = (SVOP*)cUNOPo->op_first;
85e6fe83 5172
3280af22 5173 o->op_private |= (PL_hints & HINT_STRICT_REFS);
79072805 5174 if (kid->op_type == OP_CONST) {
44a8e56a 5175 int iscv;
5176 GV *gv;
504618e9 5177 SV * const kidsv = kid->op_sv;
44a8e56a 5178
779c5bc9
GS		 5179 /* Is it a constant from cv_const_sv()? */
5180 if (SvROK(kidsv) && SvREADONLY(kidsv)) {
5181 SV *rsv = SvRV(kidsv);
504618e9 5182 const int svtype = SvTYPE(rsv);
e1ec3a88 5183 const char *badtype = Nullch;
779c5bc9
GS		 5184
5185 switch (o->op_type) {
5186 case OP_RV2SV:
5187 if (svtype > SVt_PVMG)
5188 badtype = "a SCALAR";
5189 break;
5190 case OP_RV2AV:
5191 if (svtype != SVt_PVAV)
5192 badtype = "an ARRAY";
5193 break;
5194 case OP_RV2HV:
6d822dc4 5195 if (svtype != SVt_PVHV)
779c5bc9 5196 badtype = "a HASH";
779c5bc9
GS		 5197 break;
5198 case OP_RV2CV:
5199 if (svtype != SVt_PVCV)
5200 badtype = "a CODE";
5201 break;
5202 }
5203 if (badtype)
cea2e8a9 5204 Perl_croak(aTHX_ "Constant is not %s reference", badtype);
779c5bc9
GS		 5205 return o;
5206 }
3280af22 5207 if ((PL_hints & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
e1ec3a88 5208 const char *badthing = Nullch;
5dc0d613 5209 switch (o->op_type) {
44a8e56a 5210 case OP_RV2SV:
5211 badthing = "a SCALAR";
5212 break;
5213 case OP_RV2AV:
5214 badthing = "an ARRAY";
5215 break;
5216 case OP_RV2HV:
5217 badthing = "a HASH";
5218 break;
5219 }
5220 if (badthing)
1c846c1f 5221 Perl_croak(aTHX_
7a5fd60d
NC		 5222 "Can't use bareword (\"%"SVf"\") as %s ref while \"strict refs\" in use",
5223 kidsv, badthing);
44a8e56a 5224 }
93233ece
CS		 5225 /*
5226 * This is a little tricky. We only want to add the symbol if we
5227 * didn't add it in the lexer. Otherwise we get duplicate strict
5228 * warnings. But if we didn't add it in the lexer, we must at
5229 * least pretend like we wanted to add it even if it existed before,
5230 * or we get possible typo warnings. OPpCONST_ENTERED says
5231 * whether the lexer already added THIS instance of this symbol.
5232 */
5196be3e 5233 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 5234 do {
7a5fd60d 5235 gv = gv_fetchsv(kidsv,
748a9306 5236 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 5237 iscv
5238 ? SVt_PVCV
11343788 5239 : o->op_type == OP_RV2SV
a0d0e21e 5240 ? SVt_PV
11343788 5241 : o->op_type == OP_RV2AV
a0d0e21e 5242 ? SVt_PVAV
11343788 5243 : o->op_type == OP_RV2HV
a0d0e21e
LW		 5244 ? SVt_PVHV
5245 : SVt_PVGV);
93233ece
CS		 5246 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
5247 if (gv) {
5248 kid->op_type = OP_GV;
5249 SvREFCNT_dec(kid->op_sv);
350de78d 5250#ifdef USE_ITHREADS
638eceb6 5251 /* XXX hack: dependence on sizeof(PADOP) <= sizeof(SVOP) */
350de78d 5252 kPADOP->op_padix = pad_alloc(OP_GV, SVs_PADTMP);
dd2155a4 5253 SvREFCNT_dec(PAD_SVl(kPADOP->op_padix));
743e66e6 5254 GvIN_PAD_on(gv);
dd2155a4 5255 PAD_SETSV(kPADOP->op_padix, (SV*) SvREFCNT_inc(gv));
350de78d 5256#else
93233ece 5257 kid->op_sv = SvREFCNT_inc(gv);
350de78d 5258#endif
23f1ca44 5259 kid->op_private = 0;
76cd736e 5260 kid->op_ppaddr = PL_ppaddr[OP_GV];
a0d0e21e 5261 }
79072805 5262 }
11343788 5263 return o;
79072805
LW		 5264}
5265
5266OP *
cea2e8a9 5267Perl_ck_ftst(pTHX_ OP *o)
79072805 5268{
27da23d5 5269 dVAR;
6867be6d 5270 const I32 type = o->op_type;
79072805 5271
d0dca557
JD		 5272 if (o->op_flags & OPf_REF) {
5273 /* nothing */
5274 }
5275 else if (o->op_flags & OPf_KIDS && cUNOPo->op_first->op_type != OP_STUB) {
11343788 5276 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805
LW		 5277
5278 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
a0d0e21e 5279 OP *newop = newGVOP(type, OPf_REF,
7a5fd60d 5280 gv_fetchsv(kid->op_sv, TRUE, SVt_PVIO));
11343788 5281 op_free(o);
d0dca557 5282 o = newop;
181bc48d 5283 return o;
79072805 5284 }
1af34c76
JH		 5285 else {
5286 if ((PL_hints & HINT_FILETEST_ACCESS) &&
5287 OP_IS_FILETEST_ACCESS(o))
5288 o->op_private |= OPpFT_ACCESS;
5289 }
fbb0b3b3
RGS		 5290 if (PL_check[kid->op_type] == MEMBER_TO_FPTR(Perl_ck_ftst)
5291 && kid->op_type != OP_STAT && kid->op_type != OP_LSTAT)
5292 o->op_private |= OPpFT_STACKED;
79072805
LW		 5293 }
5294 else {
11343788 5295 op_free(o);
79072805 5296 if (type == OP_FTTTY)
8fde6460 5297 o = newGVOP(type, OPf_REF, PL_stdingv);
79072805 5298 else
d0dca557 5299 o = newUNOP(type, 0, newDEFSVOP());
79072805 5300 }
11343788 5301 return o;
79072805
LW		 5302}
5303
5304OP *
cea2e8a9 5305Perl_ck_fun(pTHX_ OP *o)
79072805 5306{
6867be6d 5307 const int type = o->op_type;
22c35a8c 5308 register I32 oa = PL_opargs[type] >> OASHIFT;
aeea060c 5309
11343788 5310 if (o->op_flags & OPf_STACKED) {
79072805
LW		 5311 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
5312 oa &= ~OA_OPTIONAL;
5313 else
11343788 5314 return no_fh_allowed(o);
79072805
LW		 5315 }
5316
11343788 5317 if (o->op_flags & OPf_KIDS) {
6867be6d
AL		 5318 OP **tokid = &cLISTOPo->op_first;
5319 register OP *kid = cLISTOPo->op_first;
5320 OP *sibl;
5321 I32 numargs = 0;
5322
8990e307 5323 if (kid->op_type == OP_PUSHMARK ||
155aba94 5324 (kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK))
8990e307 5325 {
79072805
LW		 5326 tokid = &kid->op_sibling;
5327 kid = kid->op_sibling;
5328 }
22c35a8c 5329 if (!kid && PL_opargs[type] & OA_DEFGV)
54b9620d 5330 *tokid = kid = newDEFSVOP();
79072805
LW		 5331
5332 while (oa && kid) {
5333 numargs++;
5334 sibl = kid->op_sibling;
5335 switch (oa & 7) {
5336 case OA_SCALAR:
62c18ce2
GS		 5337 /* list seen where single (scalar) arg expected? */
5338 if (numargs == 1 && !(oa >> 4)
5339 && kid->op_type == OP_LIST && type != OP_SCALAR)
5340 {
5341 return too_many_arguments(o,PL_op_desc[type]);
5342 }
79072805
LW		 5343 scalar(kid);
5344 break;
5345 case OA_LIST:
5346 if (oa < 16) {
5347 kid = 0;
5348 continue;
5349 }
5350 else
5351 list(kid);
5352 break;
5353 case OA_AVREF:
936edb8b 5354 if ((type == OP_PUSH || type == OP_UNSHIFT)
f87c3213 5355 && !kid->op_sibling && ckWARN(WARN_SYNTAX))
9014280d 5356 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
de4864e4 5357 "Useless use of %s with no values",
936edb8b 5358 PL_op_desc[type]);
b2ffa427 5359
79072805 5360 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5361 (kid->op_private & OPpCONST_BARE))
5362 {
79072805 5363 OP *newop = newAVREF(newGVOP(OP_GV, 0,
7a5fd60d 5364 gv_fetchsv(((SVOP*)kid)->op_sv, TRUE, SVt_PVAV) ));
12bcd1a6
PM		 5365 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
5366 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
7a5fd60d
NC		 5367 "Array @%"SVf" missing the @ in argument %"IVdf" of %s()",
5368 ((SVOP*)kid)->op_sv, (IV)numargs, PL_op_desc[type]);
79072805
LW		 5369 op_free(kid);
5370 kid = newop;
5371 kid->op_sibling = sibl;
5372 *tokid = kid;
5373 }
8990e307 5374 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
35cd451c 5375 bad_type(numargs, "array", PL_op_desc[type], kid);
a0d0e21e 5376 mod(kid, type);
79072805
LW		 5377 break;
5378 case OA_HVREF:
5379 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5380 (kid->op_private & OPpCONST_BARE))
5381 {
79072805 5382 OP *newop = newHVREF(newGVOP(OP_GV, 0,
7a5fd60d 5383 gv_fetchsv(((SVOP*)kid)->op_sv, TRUE, SVt_PVHV) ));
12bcd1a6
PM		 5384 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
5385 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
7a5fd60d
NC		 5386 "Hash %%%"SVf" missing the %% in argument %"IVdf" of %s()",
5387 ((SVOP*)kid)->op_sv, (IV)numargs, PL_op_desc[type]);
79072805
LW		 5388 op_free(kid);
5389 kid = newop;
5390 kid->op_sibling = sibl;
5391 *tokid = kid;
5392 }
8990e307 5393 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
35cd451c 5394 bad_type(numargs, "hash", PL_op_desc[type], kid);
a0d0e21e 5395 mod(kid, type);
79072805
LW		 5396 break;
5397 case OA_CVREF:
5398 {
a0d0e21e 5399 OP *newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 5400 kid->op_sibling = 0;
5401 linklist(kid);
5402 newop->op_next = newop;
5403 kid = newop;
5404 kid->op_sibling = sibl;
5405 *tokid = kid;
5406 }
5407 break;
5408 case OA_FILEREF:
c340be78 5409 if (kid->op_type != OP_GV && kid->op_type != OP_RV2GV) {
79072805 5410 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 5411 (kid->op_private & OPpCONST_BARE))
5412 {
79072805 5413 OP *newop = newGVOP(OP_GV, 0,
7a5fd60d 5414 gv_fetchsv(((SVOP*)kid)->op_sv, TRUE, SVt_PVIO) );
afbdacea 5415 if (!(o->op_private & 1) && /* if not unop */
8a996ce8 5416 kid == cLISTOPo->op_last)
364daeac 5417 cLISTOPo->op_last = newop;
79072805
LW		 5418 op_free(kid);
5419 kid = newop;
5420 }
1ea32a52
GS		 5421 else if (kid->op_type == OP_READLINE) {
5422 /* neophyte patrol: open(<FH>), close(<FH>) etc. */
53e06cf0 5423 bad_type(numargs, "HANDLE", OP_DESC(o), kid);
1ea32a52 5424 }
79072805 5425 else {
35cd451c 5426 I32 flags = OPf_SPECIAL;
a6c40364 5427 I32 priv = 0;
2c8ac474
GS		 5428 PADOFFSET targ = 0;
5429
35cd451c 5430 /* is this op a FH constructor? */
853846ea 5431 if (is_handle_constructor(o,numargs)) {
e1ec3a88 5432 const char *name = Nullch;
dd2155a4 5433 STRLEN len = 0;
2c8ac474
GS		 5434
5435 flags = 0;
5436 /* Set a flag to tell rv2gv to vivify
853846ea
NIS		 5437 * need to "prove" flag does not mean something
5438 * else already - NI-S 1999/05/07
2c8ac474
GS		 5439 */
5440 priv = OPpDEREF;
5441 if (kid->op_type == OP_PADSV) {
dd2155a4
DM		 5442 name = PAD_COMPNAME_PV(kid->op_targ);
5443 /* SvCUR of a pad namesv can't be trusted
5444 * (see PL_generation), so calc its length
5445 * manually */
5446 if (name)
5447 len = strlen(name);
5448
2c8ac474
GS		 5449 }
5450 else if (kid->op_type == OP_RV2SV
5451 && kUNOP->op_first->op_type == OP_GV)
5452 {
5453 GV *gv = cGVOPx_gv(kUNOP->op_first);
5454 name = GvNAME(gv);
5455 len = GvNAMELEN(gv);
5456 }
afd1915d
GS		 5457 else if (kid->op_type == OP_AELEM
5458 || kid->op_type == OP_HELEM)
5459 {
0c4b0a3f
JH		 5460 OP *op;
5461
5462 name = 0;
5463 if ((op = ((BINOP*)kid)->op_first)) {
5464 SV *tmpstr = Nullsv;
e1ec3a88 5465 const char *a =
0c4b0a3f
JH		 5466 kid->op_type == OP_AELEM ?
5467 "[]" : "{}";
5468 if (((op->op_type == OP_RV2AV) ||
5469 (op->op_type == OP_RV2HV)) &&
5470 (op = ((UNOP*)op)->op_first) &&
5471 (op->op_type == OP_GV)) {
5472 /* packagevar $a[] or $h{} */
5473 GV *gv = cGVOPx_gv(op);
5474 if (gv)
5475 tmpstr =
5476 Perl_newSVpvf(aTHX_
5477 "%s%c...%c",
5478 GvNAME(gv),
5479 a[0], a[1]);
5480 }
5481 else if (op->op_type == OP_PADAV
5482 || op->op_type == OP_PADHV) {
5483 /* lexicalvar $a[] or $h{} */
6867be6d 5484 const char *padname =
0c4b0a3f
JH		 5485 PAD_COMPNAME_PV(op->op_targ);
5486 if (padname)
5487 tmpstr =
5488 Perl_newSVpvf(aTHX_
5489 "%s%c...%c",
5490 padname + 1,
5491 a[0], a[1]);
5492
5493 }
5494 if (tmpstr) {
93524f2b 5495 name = SvPV_const(tmpstr, len);
0c4b0a3f
JH		 5496 sv_2mortal(tmpstr);
5497 }
5498 }
5499 if (!name) {
5500 name = "__ANONIO__";
5501 len = 10;
5502 }
5503 mod(kid, type);
afd1915d 5504 }
2c8ac474
GS		 5505 if (name) {
5506 SV *namesv;
5507 targ = pad_alloc(OP_RV2GV, SVs_PADTMP);
dd2155a4 5508 namesv = PAD_SVl(targ);
862a34c6 5509 SvUPGRADE(namesv, SVt_PV);
2c8ac474
GS		 5510 if (*name != '$')
5511 sv_setpvn(namesv, "$", 1);
5512 sv_catpvn(namesv, name, len);
5513 }
853846ea 5514 }
79072805 5515 kid->op_sibling = 0;
35cd451c 5516 kid = newUNOP(OP_RV2GV, flags, scalar(kid));
2c8ac474
GS		 5517 kid->op_targ = targ;
5518 kid->op_private |= priv;
79072805
LW		 5519 }
5520 kid->op_sibling = sibl;
5521 *tokid = kid;
5522 }
5523 scalar(kid);
5524 break;
5525 case OA_SCALARREF:
a0d0e21e 5526 mod(scalar(kid), type);
79072805
LW		 5527 break;
5528 }
5529 oa >>= 4;
5530 tokid = &kid->op_sibling;
5531 kid = kid->op_sibling;
5532 }
11343788 5533 o->op_private |= numargs;
79072805 5534 if (kid)
53e06cf0 5535 return too_many_arguments(o,OP_DESC(o));
11343788 5536 listkids(o);
79072805 5537 }
22c35a8c 5538 else if (PL_opargs[type] & OA_DEFGV) {
11343788 5539 op_free(o);
54b9620d 5540 return newUNOP(type, 0, newDEFSVOP());
a0d0e21e
LW		 5541 }
5542
79072805
LW		 5543 if (oa) {
5544 while (oa & OA_OPTIONAL)
5545 oa >>= 4;
5546 if (oa && oa != OA_LIST)
53e06cf0 5547 return too_few_arguments(o,OP_DESC(o));
79072805 5548 }
11343788 5549 return o;
79072805
LW		 5550}
5551
5552OP *
cea2e8a9 5553Perl_ck_glob(pTHX_ OP *o)
79072805 5554{
27da23d5 5555 dVAR;
fb73857a 5556 GV *gv;
5557
649da076 5558 o = ck_fun(o);
1f2bfc8a 5559 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 5560 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 5561
b9f751c0
GS		 5562 if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV))
5563 && GvCVu(gv) && GvIMPORTED_CV(gv)))
5564 {
fb73857a 5565 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
b9f751c0 5566 }
b1cb66bf 5567
52bb0670 5568#if !defined(PERL_EXTERNAL_GLOB)
72b16652 5569 /* XXX this can be tightened up and made more failsafe. */
f444d496 5570 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv))) {
7d3fb230 5571 GV *glob_gv;
72b16652 5572 ENTER;
00ca71c1
NIS		 5573 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
5574 newSVpvn("File::Glob", 10), Nullsv, Nullsv, Nullsv);
72b16652 5575 gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
7d3fb230
BS		 5576 glob_gv = gv_fetchpv("File::Glob::csh_glob", FALSE, SVt_PVCV);
5577 GvCV(gv) = GvCV(glob_gv);
7fc63493 5578 (void)SvREFCNT_inc((SV*)GvCV(gv));
7d3fb230 5579 GvIMPORTED_CV_on(gv);
72b16652
GS		 5580 LEAVE;
5581 }
52bb0670 5582#endif /* PERL_EXTERNAL_GLOB */
72b16652 5583
b9f751c0 5584 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
5196be3e 5585 append_elem(OP_GLOB, o,
80252599 5586 newSVOP(OP_CONST, 0, newSViv(PL_glob_index++)));
1f2bfc8a 5587 o->op_type = OP_LIST;
22c35a8c 5588 o->op_ppaddr = PL_ppaddr[OP_LIST];
1f2bfc8a 5589 cLISTOPo->op_first->op_type = OP_PUSHMARK;
22c35a8c 5590 cLISTOPo->op_first->op_ppaddr = PL_ppaddr[OP_PUSHMARK];
ad33f57d 5591 cLISTOPo->op_first->op_targ = 0;
1f2bfc8a 5592 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 5593 append_elem(OP_LIST, o,
1f2bfc8a
MB		 5594 scalar(newUNOP(OP_RV2CV, 0,
5595 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 5596 o = newUNOP(OP_NULL, 0, ck_subr(o));
5597 o->op_targ = OP_GLOB; /* hint at what it used to be */
5598 return o;
b1cb66bf 5599 }
5600 gv = newGVgen("main");
a0d0e21e 5601 gv_IOadd(gv);
11343788
MB		 5602 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
5603 scalarkids(o);
649da076 5604 return o;
79072805
LW		 5605}
5606
5607OP *
cea2e8a9 5608Perl_ck_grep(pTHX_ OP *o)
79072805 5609{
27da23d5 5610 dVAR;
79072805
LW		 5611 LOGOP *gwop;
5612 OP *kid;
6867be6d 5613 const OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
59f00321 5614 I32 offset;
79072805 5615
22c35a8c 5616 o->op_ppaddr = PL_ppaddr[OP_GREPSTART];
b7dc083c 5617 NewOp(1101, gwop, 1, LOGOP);
aeea060c 5618
11343788 5619 if (o->op_flags & OPf_STACKED) {
a0d0e21e 5620 OP* k;
11343788
MB		 5621 o = ck_sort(o);
5622 kid = cLISTOPo->op_first->op_sibling;
d09ad856
BS		 5623 if (!cUNOPx(kid)->op_next)
5624 Perl_croak(aTHX_ "panic: ck_grep");
e3c9a8b9 5625 for (k = cUNOPx(kid)->op_first; k; k = k->op_next) {
a0d0e21e
LW		 5626 kid = k;
5627 }
5628 kid->op_next = (OP*)gwop;
11343788 5629 o->op_flags &= ~OPf_STACKED;
93a17b20 5630 }
11343788 5631 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 5632 if (type == OP_MAPWHILE)
5633 list(kid);
5634 else
5635 scalar(kid);
11343788 5636 o = ck_fun(o);
3280af22 5637 if (PL_error_count)
11343788 5638 return o;
aeea060c 5639 kid = cLISTOPo->op_first->op_sibling;
79072805 5640 if (kid->op_type != OP_NULL)
cea2e8a9 5641 Perl_croak(aTHX_ "panic: ck_grep");
79072805
LW		 5642 kid = kUNOP->op_first;
5643
a0d0e21e 5644 gwop->op_type = type;
22c35a8c 5645 gwop->op_ppaddr = PL_ppaddr[type];
11343788 5646 gwop->op_first = listkids(o);
79072805 5647 gwop->op_flags |= OPf_KIDS;
79072805 5648 gwop->op_other = LINKLIST(kid);
79072805 5649 kid->op_next = (OP*)gwop;
59f00321
RGS		 5650 offset = pad_findmy("$_");
5651 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS(offset) & SVpad_OUR) {
5652 o->op_private = gwop->op_private = 0;
5653 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
5654 }
5655 else {
5656 o->op_private = gwop->op_private = OPpGREP_LEX;
5657 gwop->op_targ = o->op_targ = offset;
5658 }
79072805 5659
11343788 5660 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 5661 if (!kid || !kid->op_sibling)
53e06cf0 5662 return too_few_arguments(o,OP_DESC(o));
a0d0e21e
LW		 5663 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
5664 mod(kid, OP_GREPSTART);
5665
79072805
LW		 5666 return (OP*)gwop;
5667}
5668
5669OP *
cea2e8a9 5670Perl_ck_index(pTHX_ OP *o)
79072805 5671{
11343788
MB		 5672 if (o->op_flags & OPf_KIDS) {
5673 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
0b71040e
LW		 5674 if (kid)
5675 kid = kid->op_sibling; /* get past "big" */
79072805 5676 if (kid && kid->op_type == OP_CONST)
2779dcf1 5677 fbm_compile(((SVOP*)kid)->op_sv, 0);
79072805 5678 }
11343788 5679 return ck_fun(o);
79072805
LW		 5680}
5681
5682OP *
cea2e8a9 5683Perl_ck_lengthconst(pTHX_ OP *o)
79072805
LW		 5684{
5685 /* XXX length optimization goes here */
11343788 5686 return ck_fun(o);
79072805
LW		 5687}
5688
5689OP *
cea2e8a9 5690Perl_ck_lfun(pTHX_ OP *o)
79072805 5691{
6867be6d 5692 const OPCODE type = o->op_type;
5dc0d613 5693 return modkids(ck_fun(o), type);
79072805
LW		 5694}
5695
5696OP *
cea2e8a9 5697Perl_ck_defined(pTHX_ OP *o) /* 19990527 MJD */
69794302 5698{
12bcd1a6 5699 if ((o->op_flags & OPf_KIDS) && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)) {
d0334bed
GS		 5700 switch (cUNOPo->op_first->op_type) {
5701 case OP_RV2AV:
a8739d98
JH		 5702 /* This is needed for
5703 if (defined %stash::)
5704 to work. Do not break Tk.
5705 */
1c846c1f 5706 break; /* Globals via GV can be undef */
d0334bed
GS		 5707 case OP_PADAV:
5708 case OP_AASSIGN: /* Is this a good idea? */
12bcd1a6 5709 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
f10b0346 5710 "defined(@array) is deprecated");
12bcd1a6 5711 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
cc507455 5712 "\t(Maybe you should just omit the defined()?)\n");
69794302 5713 break;
d0334bed 5714 case OP_RV2HV:
a8739d98
JH		 5715 /* This is needed for
5716 if (defined %stash::)
5717 to work. Do not break Tk.
5718 */
1c846c1f 5719 break; /* Globals via GV can be undef */
d0334bed 5720 case OP_PADHV:
12bcd1a6 5721 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
894356b3 5722 "defined(%%hash) is deprecated");
12bcd1a6 5723 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
cc507455 5724 "\t(Maybe you should just omit the defined()?)\n");
d0334bed
GS		 5725 break;
5726 default:
5727 /* no warning */
5728 break;
5729 }
69794302
MJD		 5730 }
5731 return ck_rfun(o);
5732}
5733
5734OP *
cea2e8a9 5735Perl_ck_rfun(pTHX_ OP *o)
8990e307 5736{
6867be6d 5737 const OPCODE type = o->op_type;
5dc0d613 5738 return refkids(ck_fun(o), type);
8990e307
LW		 5739}
5740
5741OP *
cea2e8a9 5742Perl_ck_listiob(pTHX_ OP *o)
79072805
LW		 5743{
5744 register OP *kid;
aeea060c 5745
11343788 5746 kid = cLISTOPo->op_first;
79072805 5747 if (!kid) {
11343788
MB		 5748 o = force_list(o);
5749 kid = cLISTOPo->op_first;
79072805
LW		 5750 }
5751 if (kid->op_type == OP_PUSHMARK)
5752 kid = kid->op_sibling;
11343788 5753 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 5754 kid = kid->op_sibling;
5755 else if (kid && !kid->op_sibling) { /* print HANDLE; */
5756 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 5757 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 5758 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 5759 cLISTOPo->op_first->op_sibling = kid;
5760 cLISTOPo->op_last = kid;
79072805
LW		 5761 kid = kid->op_sibling;
5762 }
5763 }
b2ffa427 5764
79072805 5765 if (!kid)
54b9620d 5766 append_elem(o->op_type, o, newDEFSVOP());
79072805 5767
2de3dbcc 5768 return listkids(o);
bbce6d69 5769}
5770
5771OP *
b162f9ea
IZ		 5772Perl_ck_sassign(pTHX_ OP *o)
5773{
5774 OP *kid = cLISTOPo->op_first;
5775 /* has a disposable target? */
5776 if ((PL_opargs[kid->op_type] & OA_TARGLEX)
6b66af17
GS		 5777 && !(kid->op_flags & OPf_STACKED)
5778 /* Cannot steal the second time! */
5779 && !(kid->op_private & OPpTARGET_MY))
b162f9ea
IZ		 5780 {
5781 OP *kkid = kid->op_sibling;
5782
5783 /* Can just relocate the target. */
2c2d71f5
JH		 5784 if (kkid && kkid->op_type == OP_PADSV
5785 && !(kkid->op_private & OPpLVAL_INTRO))
5786 {
b162f9ea 5787 kid->op_targ = kkid->op_targ;
743e66e6 5788 kkid->op_targ = 0;
b162f9ea
IZ		 5789 /* Now we do not need PADSV and SASSIGN. */
5790 kid->op_sibling = o->op_sibling; /* NULL */
5791 cLISTOPo->op_first = NULL;
5792 op_free(o);
5793 op_free(kkid);
5794 kid->op_private |= OPpTARGET_MY; /* Used for context settings */
5795 return kid;
5796 }
5797 }
b9d46b39
RGS		 5798 /* optimise C<my $x = undef> to C<my $x> */
5799 if (kid->op_type == OP_UNDEF) {
5800 OP *kkid = kid->op_sibling;
5801 if (kkid && kkid->op_type == OP_PADSV
5802 && (kkid->op_private & OPpLVAL_INTRO))
5803 {
5804 cLISTOPo->op_first = NULL;
5805 kid->op_sibling = NULL;
5806 op_free(o);
5807 op_free(kid);
5808 return kkid;
5809 }
5810 }
b162f9ea
IZ		 5811 return o;
5812}
5813
5814OP *
cea2e8a9 5815Perl_ck_match(pTHX_ OP *o)
79072805 5816{
59f00321 5817 if (o->op_type != OP_QR) {
6867be6d 5818 const I32 offset = pad_findmy("$_");
59f00321
RGS		 5819 if (offset != NOT_IN_PAD && !(PAD_COMPNAME_FLAGS(offset) & SVpad_OUR)) {
5820 o->op_targ = offset;
5821 o->op_private |= OPpTARGET_MY;
5822 }
5823 }
5824 if (o->op_type == OP_MATCH || o->op_type == OP_QR)
5825 o->op_private |= OPpRUNTIME;
11343788 5826 return o;
79072805
LW		 5827}
5828
5829OP *
f5d5a27c
CS		 5830Perl_ck_method(pTHX_ OP *o)
5831{
5832 OP *kid = cUNOPo->op_first;
5833 if (kid->op_type == OP_CONST) {
5834 SV* sv = kSVOP->op_sv;
b15aece3 5835 if (!(strchr(SvPVX_const(sv), ':') || strchr(SvPVX_const(sv), '\''))) {
f5d5a27c 5836 OP *cmop;
1c846c1f 5837 if (!SvREADONLY(sv) || !SvFAKE(sv)) {
b15aece3 5838 sv = newSVpvn_share(SvPVX_const(sv), SvCUR(sv), 0);
1c846c1f
NIS		 5839 }
5840 else {
5841 kSVOP->op_sv = Nullsv;
5842 }
f5d5a27c 5843 cmop = newSVOP(OP_METHOD_NAMED, 0, sv);
f5d5a27c
CS		 5844 op_free(o);
5845 return cmop;
5846 }
5847 }
5848 return o;
5849}
5850
5851OP *
cea2e8a9 5852Perl_ck_null(pTHX_ OP *o)
79072805 5853{
11343788 5854 return o;
79072805
LW		 5855}
5856
5857OP *
16fe6d59
GS		 5858Perl_ck_open(pTHX_ OP *o)
5859{
5860 HV *table = GvHV(PL_hintgv);
5861 if (table) {
5862 SV **svp;
5863 I32 mode;
5864 svp = hv_fetch(table, "open_IN", 7, FALSE);
5865 if (svp && *svp) {
5866 mode = mode_from_discipline(*svp);
5867 if (mode & O_BINARY)
5868 o->op_private |= OPpOPEN_IN_RAW;
5869 else if (mode & O_TEXT)
5870 o->op_private |= OPpOPEN_IN_CRLF;
5871 }
5872
5873 svp = hv_fetch(table, "open_OUT", 8, FALSE);
5874 if (svp && *svp) {
5875 mode = mode_from_discipline(*svp);
5876 if (mode & O_BINARY)
5877 o->op_private |= OPpOPEN_OUT_RAW;
5878 else if (mode & O_TEXT)
5879 o->op_private |= OPpOPEN_OUT_CRLF;
5880 }
5881 }
5882 if (o->op_type == OP_BACKTICK)
5883 return o;
3b82e551
JH		 5884 {
5885 /* In case of three-arg dup open remove strictness
5886 * from the last arg if it is a bareword. */
5887 OP *first = cLISTOPx(o)->op_first; /* The pushmark. */
5888 OP *last = cLISTOPx(o)->op_last; /* The bareword. */
5889 OP *oa;
b15aece3 5890 const char *mode;
3b82e551
JH		 5891
5892 if ((last->op_type == OP_CONST) && /* The bareword. */
5893 (last->op_private & OPpCONST_BARE) &&
5894 (last->op_private & OPpCONST_STRICT) &&
5895 (oa = first->op_sibling) && /* The fh. */
5896 (oa = oa->op_sibling) && /* The mode. */
5897 SvPOK(((SVOP*)oa)->op_sv) &&
b15aece3 5898 (mode = SvPVX_const(((SVOP*)oa)->op_sv)) &&
3b82e551
JH		 5899 mode[0] == '>' && mode[1] == '&' && /* A dup open. */
5900 (last == oa->op_sibling)) /* The bareword. */
5901 last->op_private &= ~OPpCONST_STRICT;
5902 }
16fe6d59
GS		 5903 return ck_fun(o);
5904}
5905
5906OP *
cea2e8a9 5907Perl_ck_repeat(pTHX_ OP *o)
79072805 5908{
11343788
MB		 5909 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
5910 o->op_private |= OPpREPEAT_DOLIST;
5911 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 5912 }
5913 else
11343788
MB		 5914 scalar(o);
5915 return o;
79072805
LW		 5916}
5917
5918OP *
cea2e8a9 5919Perl_ck_require(pTHX_ OP *o)
8990e307 5920{
ec4ab249
GA		 5921 GV* gv;
5922
11343788
MB		 5923 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
5924 SVOP *kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 5925
5926 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
5c144d81
NC		 5927 SV *sv = kid->op_sv;
5928 U32 was_readonly = SvREADONLY(sv);
8990e307 5929 char *s;
5c144d81
NC		 5930
5931 if (was_readonly) {
5932 if (SvFAKE(sv)) {
5933 sv_force_normal_flags(sv, 0);
5934 assert(!SvREADONLY(sv));
5935 was_readonly = 0;
5936 } else {
5937 SvREADONLY_off(sv);
5938 }
5939 }
5940
5941 for (s = SvPVX(sv); *s; s++) {
a0d0e21e
LW		 5942 if (*s == ':' && s[1] == ':') {
5943 *s = '/';
1aef975c 5944 Move(s+2, s+1, strlen(s+2)+1, char);
5c144d81 5945 SvCUR_set(sv, SvCUR(sv) - 1);
a0d0e21e 5946 }
8990e307 5947 }
5c144d81
NC		 5948 sv_catpvn(sv, ".pm", 3);
5949 SvFLAGS(sv) |= was_readonly;
8990e307
LW		 5950 }
5951 }
ec4ab249
GA		 5952
5953 /* handle override, if any */
5954 gv = gv_fetchpv("require", FALSE, SVt_PVCV);
b9f751c0 5955 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv)))
ec4ab249
GA		 5956 gv = gv_fetchpv("CORE::GLOBAL::require", FALSE, SVt_PVCV);
5957
b9f751c0 5958 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
ec4ab249
GA		 5959 OP *kid = cUNOPo->op_first;
5960 cUNOPo->op_first = 0;
5961 op_free(o);
5962 return ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
5963 append_elem(OP_LIST, kid,
5964 scalar(newUNOP(OP_RV2CV, 0,
5965 newGVOP(OP_GV, 0,
5966 gv))))));
5967 }
5968
11343788 5969 return ck_fun(o);
8990e307
LW		 5970}
5971
78f9721b
SM		 5972OP *
5973Perl_ck_return(pTHX_ OP *o)
5974{
78f9721b 5975 if (CvLVALUE(PL_compcv)) {
6867be6d 5976 OP *kid;
78f9721b
SM		 5977 for (kid = cLISTOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
5978 mod(kid, OP_LEAVESUBLV);
5979 }
5980 return o;
5981}
5982
22c35a8c 5983#if 0
8990e307 5984OP *
cea2e8a9 5985Perl_ck_retarget(pTHX_ OP *o)
79072805 5986{
cea2e8a9 5987 Perl_croak(aTHX_ "NOT IMPL LINE %d",__LINE__);
79072805 5988 /* STUB */
11343788 5989 return o;
79072805 5990}
22c35a8c 5991#endif
79072805
LW		 5992
5993OP *
cea2e8a9 5994Perl_ck_select(pTHX_ OP *o)
79072805 5995{
27da23d5 5996 dVAR;
c07a80fd 5997 OP* kid;
11343788
MB		 5998 if (o->op_flags & OPf_KIDS) {
5999 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 6000 if (kid && kid->op_sibling) {
11343788 6001 o->op_type = OP_SSELECT;
22c35a8c 6002 o->op_ppaddr = PL_ppaddr[OP_SSELECT];
11343788
MB		 6003 o = ck_fun(o);
6004 return fold_constants(o);
79072805
LW		 6005 }
6006 }
11343788
MB		 6007 o = ck_fun(o);
6008 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 6009 if (kid && kid->op_type == OP_RV2GV)
6010 kid->op_private &= ~HINT_STRICT_REFS;
11343788 6011 return o;
79072805
LW		 6012}
6013
6014OP *
cea2e8a9 6015Perl_ck_shift(pTHX_ OP *o)
79072805 6016{
6867be6d 6017 const I32 type = o->op_type;
79072805 6018
11343788 6019 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2 6020 OP *argop;
b2ffa427 6021
11343788 6022 op_free(o);
6d4ff0d2 6023 argop = newUNOP(OP_RV2AV, 0,
8fde6460 6024 scalar(newGVOP(OP_GV, 0, CvUNIQUE(PL_compcv) ? PL_argvgv : PL_defgv)));
6d4ff0d2 6025 return newUNOP(type, 0, scalar(argop));
79072805 6026 }
11343788 6027 return scalar(modkids(ck_fun(o), type));
79072805
LW		 6028}
6029
6030OP *
cea2e8a9 6031Perl_ck_sort(pTHX_ OP *o)
79072805 6032{
8e3f9bdf 6033 OP *firstkid;
bbce6d69 6034
9ea6e965 6035 if (o->op_type == OP_SORT && o->op_flags & OPf_STACKED)
51a19bc0 6036 simplify_sort(o);
8e3f9bdf
GS		 6037 firstkid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
6038 if (o->op_flags & OPf_STACKED) { /* may have been cleared */
9c5ffd7c 6039 OP *k = NULL;
8e3f9bdf 6040 OP *kid = cUNOPx(firstkid)->op_first; /* get past null */
79072805 6041
463ee0b2 6042 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 6043 linklist(kid);
463ee0b2
LW		 6044 if (kid->op_type == OP_SCOPE) {
6045 k = kid->op_next;
6046 kid->op_next = 0;
79072805 6047 }
463ee0b2 6048 else if (kid->op_type == OP_LEAVE) {
11343788 6049 if (o->op_type == OP_SORT) {
93c66552 6050 op_null(kid); /* wipe out leave */
748a9306 6051 kid->op_next = kid;
463ee0b2 6052
748a9306
LW		 6053 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
6054 if (k->op_next == kid)
6055 k->op_next = 0;
71a29c3c
GS		 6056 /* don't descend into loops */
6057 else if (k->op_type == OP_ENTERLOOP
6058 || k->op_type == OP_ENTERITER)
6059 {
6060 k = cLOOPx(k)->op_lastop;
6061 }
748a9306 6062 }
463ee0b2 6063 }
748a9306
LW		 6064 else
6065 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 6066 k = kLISTOP->op_first;
463ee0b2 6067 }
a2efc822 6068 CALL_PEEP(k);
a0d0e21e 6069
8e3f9bdf
GS		 6070 kid = firstkid;
6071 if (o->op_type == OP_SORT) {
6072 /* provide scalar context for comparison function/block */
6073 kid = scalar(kid);
a0d0e21e 6074 kid->op_next = kid;
8e3f9bdf 6075 }
a0d0e21e
LW		 6076 else
6077 kid->op_next = k;
11343788 6078 o->op_flags |= OPf_SPECIAL;
79072805 6079 }
c6e96bcb 6080 else if (kid->op_type == OP_RV2SV || kid->op_type == OP_PADSV)
93c66552 6081 op_null(firstkid);
8e3f9bdf
GS		 6082
6083 firstkid = firstkid->op_sibling;
79072805 6084 }
bbce6d69 6085
8e3f9bdf
GS		 6086 /* provide list context for arguments */
6087 if (o->op_type == OP_SORT)
6088 list(firstkid);
6089
11343788 6090 return o;
79072805 6091}
bda4119b
GS		 6092
6093STATIC void
cea2e8a9 6094S_simplify_sort(pTHX_ OP *o)
9c007264
JH		 6095{
6096 register OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
6097 OP *k;
eb209983 6098 int descending;
350de78d 6099 GV *gv;
770526c1 6100 const char *gvname;
9c007264
JH		 6101 if (!(o->op_flags & OPf_STACKED))
6102 return;
1c846c1f
NIS		 6103 GvMULTI_on(gv_fetchpv("a", TRUE, SVt_PV));
6104 GvMULTI_on(gv_fetchpv("b", TRUE, SVt_PV));
82092f1d 6105 kid = kUNOP->op_first; /* get past null */
9c007264
JH		 6106 if (kid->op_type != OP_SCOPE)
6107 return;
6108 kid = kLISTOP->op_last; /* get past scope */
6109 switch(kid->op_type) {
6110 case OP_NCMP:
6111 case OP_I_NCMP:
6112 case OP_SCMP:
6113 break;
6114 default:
6115 return;
6116 }
6117 k = kid; /* remember this node*/
6118 if (kBINOP->op_first->op_type != OP_RV2SV)
6119 return;
6120 kid = kBINOP->op_first; /* get past cmp */
6121 if (kUNOP->op_first->op_type != OP_GV)
6122 return;
6123 kid = kUNOP->op_first; /* get past rv2sv */
638eceb6 6124 gv = kGVOP_gv;
350de78d 6125 if (GvSTASH(gv) != PL_curstash)
9c007264 6126 return;
770526c1
NC		 6127 gvname = GvNAME(gv);
6128 if (*gvname == 'a' && gvname[1] == '\0')
eb209983 6129 descending = 0;
770526c1 6130 else if (*gvname == 'b' && gvname[1] == '\0')
eb209983 6131 descending = 1;
9c007264
JH		 6132 else
6133 return;
eb209983 6134
9c007264
JH		 6135 kid = k; /* back to cmp */
6136 if (kBINOP->op_last->op_type != OP_RV2SV)
6137 return;
6138 kid = kBINOP->op_last; /* down to 2nd arg */
6139 if (kUNOP->op_first->op_type != OP_GV)
6140 return;
6141 kid = kUNOP->op_first; /* get past rv2sv */
638eceb6 6142 gv = kGVOP_gv;
770526c1
NC		 6143 if (GvSTASH(gv) != PL_curstash)
6144 return;
6145 gvname = GvNAME(gv);
6146 if ( descending
6147 ? !(*gvname == 'a' && gvname[1] == '\0')
6148 : !(*gvname == 'b' && gvname[1] == '\0'))
9c007264
JH		 6149 return;
6150 o->op_flags &= ~(OPf_STACKED | OPf_SPECIAL);
eb209983
NC		 6151 if (descending)
6152 o->op_private |= OPpSORT_DESCEND;
9c007264
JH		 6153 if (k->op_type == OP_NCMP)
6154 o->op_private |= OPpSORT_NUMERIC;
6155 if (k->op_type == OP_I_NCMP)
6156 o->op_private |= OPpSORT_NUMERIC | OPpSORT_INTEGER;
e507f050
SM		 6157 kid = cLISTOPo->op_first->op_sibling;
6158 cLISTOPo->op_first->op_sibling = kid->op_sibling; /* bypass old block */
6159 op_free(kid); /* then delete it */
9c007264 6160}
79072805
LW		 6161
6162OP *
cea2e8a9 6163Perl_ck_split(pTHX_ OP *o)
79072805 6164{
27da23d5 6165 dVAR;
79072805 6166 register OP *kid;
aeea060c 6167
11343788
MB		 6168 if (o->op_flags & OPf_STACKED)
6169 return no_fh_allowed(o);
79072805 6170
11343788 6171 kid = cLISTOPo->op_first;
8990e307 6172 if (kid->op_type != OP_NULL)
cea2e8a9 6173 Perl_croak(aTHX_ "panic: ck_split");
8990e307 6174 kid = kid->op_sibling;
11343788
MB		 6175 op_free(cLISTOPo->op_first);
6176 cLISTOPo->op_first = kid;
85e6fe83 6177 if (!kid) {
79cb57f6 6178 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpvn(" ", 1));
11343788 6179 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 6180 }
79072805 6181
de4bf5b3 6182 if (kid->op_type != OP_MATCH || kid->op_flags & OPf_STACKED) {
79072805 6183 OP *sibl = kid->op_sibling;
463ee0b2 6184 kid->op_sibling = 0;
131b3ad0 6185 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, 0);
11343788
MB		 6186 if (cLISTOPo->op_first == cLISTOPo->op_last)
6187 cLISTOPo->op_last = kid;
6188 cLISTOPo->op_first = kid;
79072805
LW		 6189 kid->op_sibling = sibl;
6190 }
6191
6192 kid->op_type = OP_PUSHRE;
22c35a8c 6193 kid->op_ppaddr = PL_ppaddr[OP_PUSHRE];
79072805 6194 scalar(kid);
041457d9 6195 if (((PMOP *)kid)->op_pmflags & PMf_GLOBAL && ckWARN(WARN_REGEXP)) {
f34840d8
MJD		 6196 Perl_warner(aTHX_ packWARN(WARN_REGEXP),
6197 "Use of /g modifier is meaningless in split");
6198 }
79072805
LW		 6199
6200 if (!kid->op_sibling)
54b9620d 6201 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 6202
6203 kid = kid->op_sibling;
6204 scalar(kid);
6205
6206 if (!kid->op_sibling)
11343788 6207 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
79072805
LW		 6208
6209 kid = kid->op_sibling;
6210 scalar(kid);
6211
6212 if (kid->op_sibling)
53e06cf0 6213 return too_many_arguments(o,OP_DESC(o));
79072805 6214
11343788 6215 return o;
79072805
LW		 6216}
6217
6218OP *
1c846c1f 6219Perl_ck_join(pTHX_ OP *o)
eb6e2d6f 6220{
041457d9
DM		 6221 const OP *kid = cLISTOPo->op_first->op_sibling;
6222 if (kid && kid->op_type == OP_MATCH) {
6223 if (ckWARN(WARN_SYNTAX)) {
6867be6d
AL		 6224 const REGEXP *re = PM_GETRE(kPMOP);
6225 const char *pmstr = re ? re->precomp : "STRING";
9014280d 6226 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
eb6e2d6f
GS		 6227 "/%s/ should probably be written as \"%s\"",
6228 pmstr, pmstr);
6229 }
6230 }
6231 return ck_fun(o);
6232}
6233
6234OP *
cea2e8a9 6235Perl_ck_subr(pTHX_ OP *o)
79072805 6236{
11343788
MB		 6237 OP *prev = ((cUNOPo->op_first->op_sibling)
6238 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
6239 OP *o2 = prev->op_sibling;
4633a7c4
LW		 6240 OP *cvop;
6241 char *proto = 0;
6242 CV *cv = 0;
46fc3d4c 6243 GV *namegv = 0;
4633a7c4
LW		 6244 int optional = 0;
6245 I32 arg = 0;
5b794e05 6246 I32 contextclass = 0;
90b7f708 6247 char *e = 0;
0723351e 6248 bool delete_op = 0;
4633a7c4 6249
d3011074 6250 o->op_private |= OPpENTERSUB_HASTARG;
11343788 6251 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 6252 if (cvop->op_type == OP_RV2CV) {
6253 SVOP* tmpop;
11343788 6254 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
93c66552 6255 op_null(cvop); /* disable rv2cv */
4633a7c4 6256 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
76cd736e 6257 if (tmpop->op_type == OP_GV && !(o->op_private & OPpENTERSUB_AMPER)) {
638eceb6 6258 GV *gv = cGVOPx_gv(tmpop);
350de78d 6259 cv = GvCVu(gv);
76cd736e
GS		 6260 if (!cv)
6261 tmpop->op_private |= OPpEARLY_CV;
06492da6
SF		 6262 else {
6263 if (SvPOK(cv)) {
6264 namegv = CvANON(cv) ? gv : CvGV(cv);
8b6b16e7 6265 proto = SvPV_nolen((SV*)cv);
06492da6
SF		 6266 }
6267 if (CvASSERTION(cv)) {
6268 if (PL_hints & HINT_ASSERTING) {
6269 if (PERLDB_ASSERTION && PL_curstash != PL_debstash)
6270 o->op_private |= OPpENTERSUB_DB;
6271 }
8fa7688f 6272 else {
0723351e 6273 delete_op = 1;
041457d9 6274 if (!(PL_hints & HINT_ASSERTIONSSEEN) && ckWARN(WARN_ASSERTIONS)) {
8fa7688f
SF		 6275 Perl_warner(aTHX_ packWARN(WARN_ASSERTIONS),
6276 "Impossible to activate assertion call");
6277 }
6278 }
06492da6 6279 }
46fc3d4c 6280 }
4633a7c4
LW		 6281 }
6282 }
f5d5a27c 6283 else if (cvop->op_type == OP_METHOD || cvop->op_type == OP_METHOD_NAMED) {
7a52d87a
GS		 6284 if (o2->op_type == OP_CONST)
6285 o2->op_private &= ~OPpCONST_STRICT;
58a40671
GS		 6286 else if (o2->op_type == OP_LIST) {
6287 OP *o = ((UNOP*)o2)->op_first->op_sibling;
6288 if (o && o->op_type == OP_CONST)
6289 o->op_private &= ~OPpCONST_STRICT;
6290 }
7a52d87a 6291 }
3280af22
NIS		 6292 o->op_private |= (PL_hints & HINT_STRICT_REFS);
6293 if (PERLDB_SUB && PL_curstash != PL_debstash)
11343788
MB		 6294 o->op_private |= OPpENTERSUB_DB;
6295 while (o2 != cvop) {
4633a7c4
LW		 6296 if (proto) {
6297 switch (*proto) {
6298 case '\0':
5dc0d613 6299 return too_many_arguments(o, gv_ename(namegv));
4633a7c4
LW		 6300 case ';':
6301 optional = 1;
6302 proto++;
6303 continue;
6304 case '$':
6305 proto++;
6306 arg++;
11343788 6307 scalar(o2);
4633a7c4
LW		 6308 break;
6309 case '%':
6310 case '@':
11343788 6311 list(o2);
4633a7c4
LW		 6312 arg++;
6313 break;
6314 case '&':
6315 proto++;
6316 arg++;
11343788 6317 if (o2->op_type != OP_REFGEN && o2->op_type != OP_UNDEF)
75fc29ea
GS		 6318 bad_type(arg,
6319 arg == 1 ? "block or sub {}" : "sub {}",
6320 gv_ename(namegv), o2);
4633a7c4
LW		 6321 break;
6322 case '*':
2ba6ecf4 6323 /* '*' allows any scalar type, including bareword */
4633a7c4
LW		 6324 proto++;
6325 arg++;
11343788 6326 if (o2->op_type == OP_RV2GV)
2ba6ecf4 6327 goto wrapref; /* autoconvert GLOB -> GLOBref */
7a52d87a
GS		 6328 else if (o2->op_type == OP_CONST)
6329 o2->op_private &= ~OPpCONST_STRICT;
9675f7ac
GS		 6330 else if (o2->op_type == OP_ENTERSUB) {
6331 /* accidental subroutine, revert to bareword */
6332 OP *gvop = ((UNOP*)o2)->op_first;
6333 if (gvop && gvop->op_type == OP_NULL) {
6334 gvop = ((UNOP*)gvop)->op_first;
6335 if (gvop) {
6336 for (; gvop->op_sibling; gvop = gvop->op_sibling)
6337 ;
6338 if (gvop &&
6339 (gvop->op_private & OPpENTERSUB_NOPAREN) &&
6340 (gvop = ((UNOP*)gvop)->op_first) &&
6341 gvop->op_type == OP_GV)
6342 {
638eceb6 6343 GV *gv = cGVOPx_gv(gvop);
9675f7ac 6344 OP *sibling = o2->op_sibling;
2692f720 6345 SV *n = newSVpvn("",0);
9675f7ac 6346 op_free(o2);
2a797ae2 6347 gv_fullname4(n, gv, "", FALSE);
2692f720 6348 o2 = newSVOP(OP_CONST, 0, n);
9675f7ac
GS		 6349 prev->op_sibling = o2;
6350 o2->op_sibling = sibling;
6351 }
6352 }
6353 }
6354 }
2ba6ecf4
GS		 6355 scalar(o2);
6356 break;
5b794e05
JH		 6357 case '[': case ']':
6358 goto oops;
6359 break;
4633a7c4
LW		 6360 case '\\':
6361 proto++;
6362 arg++;
5b794e05 6363 again:
4633a7c4 6364 switch (*proto++) {
5b794e05
JH		 6365 case '[':
6366 if (contextclass++ == 0) {
841d93c8 6367 e = strchr(proto, ']');
5b794e05
JH		 6368 if (!e || e == proto)
6369 goto oops;
6370 }
6371 else
6372 goto oops;
6373 goto again;
6374 break;
6375 case ']':
466bafcd 6376 if (contextclass) {
6867be6d
AL		 6377 char *p = proto;
6378 const char s = *p;
466bafcd
RGS		 6379 contextclass = 0;
6380 *p = '\0';
6381 while (*--p != '[');
1eb1540c 6382 bad_type(arg, Perl_form(aTHX_ "one of %s", p),
466bafcd
RGS		 6383 gv_ename(namegv), o2);
6384 *proto = s;
6385 } else
5b794e05
JH		 6386 goto oops;
6387 break;
4633a7c4 6388 case '*':
5b794e05
JH		 6389 if (o2->op_type == OP_RV2GV)
6390 goto wrapref;
6391 if (!contextclass)
6392 bad_type(arg, "symbol", gv_ename(namegv), o2);
6393 break;
4633a7c4 6394 case '&':
5b794e05
JH		 6395 if (o2->op_type == OP_ENTERSUB)
6396 goto wrapref;
6397 if (!contextclass)
6398 bad_type(arg, "subroutine entry", gv_ename(namegv), o2);
6399 break;
4633a7c4 6400 case '$':
5b794e05
JH		 6401 if (o2->op_type == OP_RV2SV ||
6402 o2->op_type == OP_PADSV ||
6403 o2->op_type == OP_HELEM ||
6404 o2->op_type == OP_AELEM ||
6405 o2->op_type == OP_THREADSV)
6406 goto wrapref;
6407 if (!contextclass)
5dc0d613 6408 bad_type(arg, "scalar", gv_ename(namegv), o2);
5b794e05 6409 break;
4633a7c4 6410 case '@':
5b794e05
JH		 6411 if (o2->op_type == OP_RV2AV ||
6412 o2->op_type == OP_PADAV)
6413 goto wrapref;
6414 if (!contextclass)
5dc0d613 6415 bad_type(arg, "array", gv_ename(namegv), o2);
5b794e05 6416 break;
4633a7c4 6417 case '%':
5b794e05
JH		 6418 if (o2->op_type == OP_RV2HV ||
6419 o2->op_type == OP_PADHV)
6420 goto wrapref;
6421 if (!contextclass)
6422 bad_type(arg, "hash", gv_ename(namegv), o2);
6423 break;
6424 wrapref:
4633a7c4 6425 {
11343788 6426 OP* kid = o2;
6fa846a0 6427 OP* sib = kid->op_sibling;
4633a7c4 6428 kid->op_sibling = 0;
6fa846a0
GS		 6429 o2 = newUNOP(OP_REFGEN, 0, kid);
6430 o2->op_sibling = sib;
e858de61 6431 prev->op_sibling = o2;
4633a7c4 6432 }
841d93c8 6433 if (contextclass && e) {
5b794e05
JH		 6434 proto = e + 1;
6435 contextclass = 0;
6436 }
4633a7c4
LW		 6437 break;
6438 default: goto oops;
6439 }
5b794e05
JH		 6440 if (contextclass)
6441 goto again;
4633a7c4 6442 break;
b1cb66bf 6443 case ' ':
6444 proto++;
6445 continue;
4633a7c4
LW		 6446 default:
6447 oops:
35c1215d
NC		 6448 Perl_croak(aTHX_ "Malformed prototype for %s: %"SVf,
6449 gv_ename(namegv), cv);
4633a7c4
LW		 6450 }
6451 }
6452 else
11343788
MB		 6453 list(o2);
6454 mod(o2, OP_ENTERSUB);
6455 prev = o2;
6456 o2 = o2->op_sibling;
4633a7c4 6457 }
fb73857a 6458 if (proto && !optional &&
6459 (*proto && *proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 6460 return too_few_arguments(o, gv_ename(namegv));
0723351e 6461 if(delete_op) {
06492da6
SF		 6462 op_free(o);
6463 o=newSVOP(OP_CONST, 0, newSViv(0));
6464 }
11343788 6465 return o;
79072805
LW		 6466}
6467
6468OP *
cea2e8a9 6469Perl_ck_svconst(pTHX_ OP *o)
8990e307 6470{
11343788
MB		 6471 SvREADONLY_on(cSVOPo->op_sv);
6472 return o;
8990e307
LW		 6473}
6474
6475OP *
cea2e8a9 6476Perl_ck_trunc(pTHX_ OP *o)
79072805 6477{
11343788
MB		 6478 if (o->op_flags & OPf_KIDS) {
6479 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 6480
a0d0e21e
LW		 6481 if (kid->op_type == OP_NULL)
6482 kid = (SVOP*)kid->op_sibling;
bb53490d
GS		 6483 if (kid && kid->op_type == OP_CONST &&
6484 (kid->op_private & OPpCONST_BARE))
6485 {
11343788 6486 o->op_flags |= OPf_SPECIAL;
bb53490d
GS		 6487 kid->op_private &= ~OPpCONST_STRICT;
6488 }
79072805 6489 }
11343788 6490 return ck_fun(o);
79072805
LW		 6491}
6492
35fba0d9 6493OP *
bab9c0ac
RGS		 6494Perl_ck_unpack(pTHX_ OP *o)
6495{
6496 OP *kid = cLISTOPo->op_first;
6497 if (kid->op_sibling) {
6498 kid = kid->op_sibling;
6499 if (!kid->op_sibling)
6500 kid->op_sibling = newDEFSVOP();
6501 }
6502 return ck_fun(o);
6503}
6504
6505OP *
35fba0d9
RG		 6506Perl_ck_substr(pTHX_ OP *o)
6507{
6508 o = ck_fun(o);
6509 if ((o->op_flags & OPf_KIDS) && o->op_private == 4) {
6510 OP *kid = cLISTOPo->op_first;
6511
6512 if (kid->op_type == OP_NULL)
6513 kid = kid->op_sibling;
6514 if (kid)
6515 kid->op_flags |= OPf_MOD;
6516
6517 }
6518 return o;
6519}
6520
61b743bb
DM		 6521/* A peephole optimizer. We visit the ops in the order they're to execute.
6522 * See the comments at the top of this file for more details about when
6523 * peep() is called */
463ee0b2 6524
79072805 6525void
864dbfa3 6526Perl_peep(pTHX_ register OP *o)
79072805 6527{
27da23d5 6528 dVAR;
79072805 6529 register OP* oldop = 0;
2d8e6c8d 6530
2814eb74 6531 if (!o || o->op_opt)
79072805 6532 return;
a0d0e21e 6533 ENTER;
462e5cf6 6534 SAVEOP();
7766f137 6535 SAVEVPTR(PL_curcop);
a0d0e21e 6536 for (; o; o = o->op_next) {
2814eb74 6537 if (o->op_opt)
a0d0e21e 6538 break;
533c011a 6539 PL_op = o;
a0d0e21e 6540 switch (o->op_type) {
acb36ea4 6541 case OP_SETSTATE:
a0d0e21e
LW		 6542 case OP_NEXTSTATE:
6543 case OP_DBSTATE:
3280af22 6544 PL_curcop = ((COP*)o); /* for warnings */
2814eb74 6545 o->op_opt = 1;
a0d0e21e
LW		 6546 break;
6547
a0d0e21e 6548 case OP_CONST:
7a52d87a
GS		 6549 if (cSVOPo->op_private & OPpCONST_STRICT)
6550 no_bareword_allowed(o);
7766f137 6551#ifdef USE_ITHREADS
3848b962 6552 case OP_METHOD_NAMED:
7766f137
GS		 6553 /* Relocate sv to the pad for thread safety.
6554 * Despite being a "constant", the SV is written to,
6555 * for reference counts, sv_upgrade() etc. */
6556 if (cSVOP->op_sv) {
6867be6d 6557 const PADOFFSET ix = pad_alloc(OP_CONST, SVs_PADTMP);
330e22d5 6558 if (o->op_type == OP_CONST && SvPADTMP(cSVOPo->op_sv)) {
6a7129a1 6559 /* If op_sv is already a PADTMP then it is being used by
9a049f1c 6560 * some pad, so make a copy. */
dd2155a4
DM		 6561 sv_setsv(PAD_SVl(ix),cSVOPo->op_sv);
6562 SvREADONLY_on(PAD_SVl(ix));
6a7129a1
GS		 6563 SvREFCNT_dec(cSVOPo->op_sv);
6564 }
6565 else {
dd2155a4 6566 SvREFCNT_dec(PAD_SVl(ix));
6a7129a1 6567 SvPADTMP_on(cSVOPo->op_sv);
dd2155a4 6568 PAD_SETSV(ix, cSVOPo->op_sv);
9a049f1c 6569 /* XXX I don't know how this isn't readonly already. */
dd2155a4 6570 SvREADONLY_on(PAD_SVl(ix));
6a7129a1 6571 }
7766f137
GS		 6572 cSVOPo->op_sv = Nullsv;
6573 o->op_targ = ix;
6574 }
6575#endif
2814eb74 6576 o->op_opt = 1;
07447971
GS		 6577 break;
6578
df91b2c5
AE		 6579 case OP_CONCAT:
6580 if (o->op_next && o->op_next->op_type == OP_STRINGIFY) {
6581 if (o->op_next->op_private & OPpTARGET_MY) {
6582 if (o->op_flags & OPf_STACKED) /* chained concats */
6583 goto ignore_optimization;
6584 else {
6585 /* assert(PL_opargs[o->op_type] & OA_TARGLEX); */
6586 o->op_targ = o->op_next->op_targ;
6587 o->op_next->op_targ = 0;
6588 o->op_private |= OPpTARGET_MY;
6589 }
6590 }
6591 op_null(o->op_next);
6592 }
6593 ignore_optimization:
2814eb74 6594 o->op_opt = 1;
df91b2c5 6595 break;
8990e307 6596 case OP_STUB:
54310121 6597 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
2814eb74 6598 o->op_opt = 1;
54310121 6599 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 6600 }
748a9306 6601 goto nothin;
79072805 6602 case OP_NULL:
acb36ea4
GS		 6603 if (o->op_targ == OP_NEXTSTATE
6604 || o->op_targ == OP_DBSTATE
6605 || o->op_targ == OP_SETSTATE)
6606 {
3280af22 6607 PL_curcop = ((COP*)o);
acb36ea4 6608 }
dad75012
AMS		 6609 /* XXX: We avoid setting op_seq here to prevent later calls
6610 to peep() from mistakenly concluding that optimisation
6611 has already occurred. This doesn't fix the real problem,
6612 though (See 20010220.007). AMS 20010719 */
2814eb74 6613 /* op_seq functionality is now replaced by op_opt */
dad75012
AMS		 6614 if (oldop && o->op_next) {
6615 oldop->op_next = o->op_next;
6616 continue;
6617 }
6618 break;
79072805 6619 case OP_SCALAR:
93a17b20 6620 case OP_LINESEQ:
463ee0b2 6621 case OP_SCOPE:
748a9306 6622 nothin:
a0d0e21e
LW		 6623 if (oldop && o->op_next) {
6624 oldop->op_next = o->op_next;
79072805
LW		 6625 continue;
6626 }
2814eb74 6627 o->op_opt = 1;
79072805
LW		 6628 break;
6629
6a077020 6630 case OP_PADAV:
79072805 6631 case OP_GV:
6a077020
DM		 6632 if (o->op_type == OP_PADAV || o->op_next->op_type == OP_RV2AV) {
6633 OP* pop = (o->op_type == OP_PADAV) ?
6634 o->op_next : o->op_next->op_next;
a0d0e21e 6635 IV i;
f9dc862f 6636 if (pop && pop->op_type == OP_CONST &&
af5acbb4 6637 ((PL_op = pop->op_next)) &&
8990e307 6638 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 6639 !(pop->op_next->op_private &
78f9721b 6640 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF|OPpMAYBE_LVSUB)) &&
b0840a2a 6641 (i = SvIV(((SVOP*)pop)->op_sv) - PL_curcop->cop_arybase)
a0d0e21e 6642 <= 255 &&
8990e307
LW		 6643 i >= 0)
6644 {
350de78d 6645 GV *gv;
af5acbb4
DM		 6646 if (cSVOPx(pop)->op_private & OPpCONST_STRICT)
6647 no_bareword_allowed(pop);
6a077020
DM		 6648 if (o->op_type == OP_GV)
6649 op_null(o->op_next);
93c66552
DM		 6650 op_null(pop->op_next);
6651 op_null(pop);
a0d0e21e
LW		 6652 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
6653 o->op_next = pop->op_next->op_next;
22c35a8c 6654 o->op_ppaddr = PL_ppaddr[OP_AELEMFAST];
a0d0e21e 6655 o->op_private = (U8)i;
6a077020
DM		 6656 if (o->op_type == OP_GV) {
6657 gv = cGVOPo_gv;
6658 GvAVn(gv);
6659 }
6660 else
6661 o->op_flags |= OPf_SPECIAL;
6662 o->op_type = OP_AELEMFAST;
6663 }
6664 o->op_opt = 1;
6665 break;
6666 }
6667
6668 if (o->op_next->op_type == OP_RV2SV) {
6669 if (!(o->op_next->op_private & OPpDEREF)) {
6670 op_null(o->op_next);
6671 o->op_private |= o->op_next->op_private & (OPpLVAL_INTRO
6672 | OPpOUR_INTRO);
6673 o->op_next = o->op_next->op_next;
6674 o->op_type = OP_GVSV;
6675 o->op_ppaddr = PL_ppaddr[OP_GVSV];
8990e307 6676 }
79072805 6677 }
e476b1b5 6678 else if ((o->op_private & OPpEARLY_CV) && ckWARN(WARN_PROTOTYPE)) {
638eceb6 6679 GV *gv = cGVOPo_gv;
b15aece3 6680 if (SvTYPE(gv) == SVt_PVGV && GvCV(gv) && SvPVX_const(GvCV(gv))) {
76cd736e
GS		 6681 /* XXX could check prototype here instead of just carping */
6682 SV *sv = sv_newmortal();
6683 gv_efullname3(sv, gv, Nullch);
9014280d 6684 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE),
35c1215d
NC		 6685 "%"SVf"() called too early to check prototype",
6686 sv);
76cd736e
GS		 6687 }
6688 }
89de2904
AMS		 6689 else if (o->op_next->op_type == OP_READLINE
6690 && o->op_next->op_next->op_type == OP_CONCAT
6691 && (o->op_next->op_next->op_flags & OPf_STACKED))
6692 {
d2c45030
AMS		 6693 /* Turn "$a .= <FH>" into an OP_RCATLINE. AMS 20010917 */
6694 o->op_type = OP_RCATLINE;
6695 o->op_flags |= OPf_STACKED;
6696 o->op_ppaddr = PL_ppaddr[OP_RCATLINE];
89de2904 6697 op_null(o->op_next->op_next);
d2c45030 6698 op_null(o->op_next);
89de2904 6699 }
76cd736e 6700
2814eb74 6701 o->op_opt = 1;
79072805
LW		 6702 break;
6703
a0d0e21e 6704 case OP_MAPWHILE:
79072805
LW		 6705 case OP_GREPWHILE:
6706 case OP_AND:
6707 case OP_OR:
c963b151 6708 case OP_DOR:
2c2d71f5
JH		 6709 case OP_ANDASSIGN:
6710 case OP_ORASSIGN:
c963b151 6711 case OP_DORASSIGN:
1a67a97c
SM		 6712 case OP_COND_EXPR:
6713 case OP_RANGE:
2814eb74 6714 o->op_opt = 1;
fd4d1407
IZ		 6715 while (cLOGOP->op_other->op_type == OP_NULL)
6716 cLOGOP->op_other = cLOGOP->op_other->op_next;
a2efc822 6717 peep(cLOGOP->op_other); /* Recursive calls are not replaced by fptr calls */
79072805
LW		 6718 break;
6719
79072805 6720 case OP_ENTERLOOP:
9c2ca71a 6721 case OP_ENTERITER:
2814eb74 6722 o->op_opt = 1;
58cccf98
SM		 6723 while (cLOOP->op_redoop->op_type == OP_NULL)
6724 cLOOP->op_redoop = cLOOP->op_redoop->op_next;
79072805 6725 peep(cLOOP->op_redoop);
58cccf98
SM		 6726 while (cLOOP->op_nextop->op_type == OP_NULL)
6727 cLOOP->op_nextop = cLOOP->op_nextop->op_next;
79072805 6728 peep(cLOOP->op_nextop);
58cccf98
SM		 6729 while (cLOOP->op_lastop->op_type == OP_NULL)
6730 cLOOP->op_lastop = cLOOP->op_lastop->op_next;
79072805
LW		 6731 peep(cLOOP->op_lastop);
6732 break;
6733
8782bef2 6734 case OP_QR:
79072805
LW		 6735 case OP_MATCH:
6736 case OP_SUBST:
2814eb74 6737 o->op_opt = 1;
9041c2e3 6738 while (cPMOP->op_pmreplstart &&
58cccf98
SM		 6739 cPMOP->op_pmreplstart->op_type == OP_NULL)
6740 cPMOP->op_pmreplstart = cPMOP->op_pmreplstart->op_next;
a0d0e21e 6741 peep(cPMOP->op_pmreplstart);
79072805
LW		 6742 break;
6743
a0d0e21e 6744 case OP_EXEC:
2814eb74 6745 o->op_opt = 1;
041457d9
DM		 6746 if (o->op_next && o->op_next->op_type == OP_NEXTSTATE
6747 && ckWARN(WARN_SYNTAX))
6748 {
a0d0e21e 6749 if (o->op_next->op_sibling &&
20408e3c
GS		 6750 o->op_next->op_sibling->op_type != OP_EXIT &&
6751 o->op_next->op_sibling->op_type != OP_WARN &&
a0d0e21e 6752 o->op_next->op_sibling->op_type != OP_DIE) {
6867be6d 6753 const line_t oldline = CopLINE(PL_curcop);
a0d0e21e 6754
57843af0 6755 CopLINE_set(PL_curcop, CopLINE((COP*)o->op_next));
9014280d 6756 Perl_warner(aTHX_ packWARN(WARN_EXEC),
eeb6a2c9 6757 "Statement unlikely to be reached");
9014280d 6758 Perl_warner(aTHX_ packWARN(WARN_EXEC),
cc507455 6759 "\t(Maybe you meant system() when you said exec()?)\n");
57843af0 6760 CopLINE_set(PL_curcop, oldline);
a0d0e21e
LW		 6761 }
6762 }
6763 break;
b2ffa427 6764
c750a3ec 6765 case OP_HELEM: {
e75d1f10 6766 UNOP *rop;
6d822dc4 6767 SV *lexname;
e75d1f10 6768 GV **fields;
6d822dc4 6769 SV **svp, *sv;
d5263905 6770 const char *key = NULL;
c750a3ec 6771 STRLEN keylen;
b2ffa427 6772
2814eb74 6773 o->op_opt = 1;
1c846c1f
NIS		 6774
6775 if (((BINOP*)o)->op_last->op_type != OP_CONST)
c750a3ec 6776 break;
1c846c1f
NIS		 6777
6778 /* Make the CONST have a shared SV */
6779 svp = cSVOPx_svp(((BINOP*)o)->op_last);
3049cdab 6780 if ((!SvFAKE(sv = *svp) || !SvREADONLY(sv)) && !IS_PADCONST(sv)) {
d5263905 6781 key = SvPV_const(sv, keylen);
25716404
GS		 6782 lexname = newSVpvn_share(key,
6783 SvUTF8(sv) ? -(I32)keylen : keylen,
6784 0);
1c846c1f
NIS		 6785 SvREFCNT_dec(sv);
6786 *svp = lexname;
6787 }
e75d1f10
RD		 6788
6789 if ((o->op_private & (OPpLVAL_INTRO)))
6790 break;
6791
6792 rop = (UNOP*)((BINOP*)o)->op_first;
6793 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
6794 break;
6795 lexname = *av_fetch(PL_comppad_name, rop->op_first->op_targ, TRUE);
6796 if (!(SvFLAGS(lexname) & SVpad_TYPED))
6797 break;
6798 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
6799 if (!fields || !GvHV(*fields))
6800 break;
93524f2b 6801 key = SvPV_const(*svp, keylen);
e75d1f10
RD		 6802 if (!hv_fetch(GvHV(*fields), key,
6803 SvUTF8(*svp) ? -(I32)keylen : keylen, FALSE))
6804 {
6805 Perl_croak(aTHX_ "No such class field \"%s\" "
6806 "in variable %s of type %s",
93524f2b 6807 key, SvPV_nolen_const(lexname), HvNAME_get(SvSTASH(lexname)));
e75d1f10
RD		 6808 }
6809
6d822dc4
MS		 6810 break;
6811 }
c750a3ec 6812
e75d1f10
RD		 6813 case OP_HSLICE: {
6814 UNOP *rop;
6815 SV *lexname;
6816 GV **fields;
6817 SV **svp;
93524f2b 6818 const char *key;
e75d1f10
RD		 6819 STRLEN keylen;
6820 SVOP *first_key_op, *key_op;
6821
6822 if ((o->op_private & (OPpLVAL_INTRO))
6823 /* I bet there's always a pushmark... */
6824 || ((LISTOP*)o)->op_first->op_sibling->op_type != OP_LIST)
6825 /* hmmm, no optimization if list contains only one key. */
6826 break;
6827 rop = (UNOP*)((LISTOP*)o)->op_last;
6828 if (rop->op_type != OP_RV2HV)
6829 break;
6830 if (rop->op_first->op_type == OP_PADSV)
6831 /* @$hash{qw(keys here)} */
6832 rop = (UNOP*)rop->op_first;
6833 else {
6834 /* @{$hash}{qw(keys here)} */
6835 if (rop->op_first->op_type == OP_SCOPE
6836 && cLISTOPx(rop->op_first)->op_last->op_type == OP_PADSV)
6837 {
6838 rop = (UNOP*)cLISTOPx(rop->op_first)->op_last;
6839 }
6840 else
6841 break;
6842 }
6843
6844 lexname = *av_fetch(PL_comppad_name, rop->op_targ, TRUE);
6845 if (!(SvFLAGS(lexname) & SVpad_TYPED))
6846 break;
6847 fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
6848 if (!fields || !GvHV(*fields))
6849 break;
6850 /* Again guessing that the pushmark can be jumped over.... */
6851 first_key_op = (SVOP*)((LISTOP*)((LISTOP*)o)->op_first->op_sibling)
6852 ->op_first->op_sibling;
6853 for (key_op = first_key_op; key_op;
6854 key_op = (SVOP*)key_op->op_sibling) {
6855 if (key_op->op_type != OP_CONST)
6856 continue;
6857 svp = cSVOPx_svp(key_op);
93524f2b 6858 key = SvPV_const(*svp, keylen);
e75d1f10
RD		 6859 if (!hv_fetch(GvHV(*fields), key,
6860 SvUTF8(*svp) ? -(I32)keylen : keylen, FALSE))
6861 {
6862 Perl_croak(aTHX_ "No such class field \"%s\" "
6863 "in variable %s of type %s",
bfcb3514 6864 key, SvPV_nolen(lexname), HvNAME_get(SvSTASH(lexname)));
e75d1f10
RD		 6865 }
6866 }
6867 break;
6868 }
6869
fe1bc4cf 6870 case OP_SORT: {
fe1bc4cf
DM		 6871 /* will point to RV2AV or PADAV op on LHS/RHS of assign */
6872 OP *oleft, *oright;
6873 OP *o2;
6874
fe1bc4cf
DM		 6875 /* check that RHS of sort is a single plain array */
6876 oright = cUNOPo->op_first;
6877 if (!oright || oright->op_type != OP_PUSHMARK)
6878 break;
471178c0
NC		 6879
6880 /* reverse sort ... can be optimised. */
6881 if (!cUNOPo->op_sibling) {
6882 /* Nothing follows us on the list. */
6883 OP *reverse = o->op_next;
6884
6885 if (reverse->op_type == OP_REVERSE &&
6886 (reverse->op_flags & OPf_WANT) == OPf_WANT_LIST) {
6887 OP *pushmark = cUNOPx(reverse)->op_first;
6888 if (pushmark && (pushmark->op_type == OP_PUSHMARK)
6889 && (cUNOPx(pushmark)->op_sibling == o)) {
6890 /* reverse -> pushmark -> sort */
6891 o->op_private |= OPpSORT_REVERSE;
6892 op_null(reverse);
6893 pushmark->op_next = oright->op_next;
6894 op_null(oright);
6895 }
6896 }
6897 }
6898
6899 /* make @a = sort @a act in-place */
6900
6901 o->op_opt = 1;
6902
fe1bc4cf
DM		 6903 oright = cUNOPx(oright)->op_sibling;
6904 if (!oright)
6905 break;
6906 if (oright->op_type == OP_NULL) { /* skip sort block/sub */
6907 oright = cUNOPx(oright)->op_sibling;
6908 }
6909
6910 if (!oright ||
6911 (oright->op_type != OP_RV2AV && oright->op_type != OP_PADAV)
6912 || oright->op_next != o
6913 || (oright->op_private & OPpLVAL_INTRO)
6914 )
6915 break;
6916
6917 /* o2 follows the chain of op_nexts through the LHS of the
6918 * assign (if any) to the aassign op itself */
6919 o2 = o->op_next;
6920 if (!o2 || o2->op_type != OP_NULL)
6921 break;
6922 o2 = o2->op_next;
6923 if (!o2 || o2->op_type != OP_PUSHMARK)
6924 break;
6925 o2 = o2->op_next;
6926 if (o2 && o2->op_type == OP_GV)
6927 o2 = o2->op_next;
6928 if (!o2
6929 || (o2->op_type != OP_PADAV && o2->op_type != OP_RV2AV)
6930 || (o2->op_private & OPpLVAL_INTRO)
6931 )
6932 break;
6933 oleft = o2;
6934 o2 = o2->op_next;
6935 if (!o2 || o2->op_type != OP_NULL)
6936 break;
6937 o2 = o2->op_next;
6938 if (!o2 || o2->op_type != OP_AASSIGN
6939 || (o2->op_flags & OPf_WANT) != OPf_WANT_VOID)
6940 break;
6941
db7511db
DM		 6942 /* check that the sort is the first arg on RHS of assign */
6943
6944 o2 = cUNOPx(o2)->op_first;
6945 if (!o2 || o2->op_type != OP_NULL)
6946 break;
6947 o2 = cUNOPx(o2)->op_first;
6948 if (!o2 || o2->op_type != OP_PUSHMARK)
6949 break;
6950 if (o2->op_sibling != o)
6951 break;
6952
fe1bc4cf
DM		 6953 /* check the array is the same on both sides */
6954 if (oleft->op_type == OP_RV2AV) {
6955 if (oright->op_type != OP_RV2AV
6956 || !cUNOPx(oright)->op_first
6957 || cUNOPx(oright)->op_first->op_type != OP_GV
6958 || cGVOPx_gv(cUNOPx(oleft)->op_first) !=
6959 cGVOPx_gv(cUNOPx(oright)->op_first)
6960 )
6961 break;
6962 }
6963 else if (oright->op_type != OP_PADAV
6964 || oright->op_targ != oleft->op_targ
6965 )
6966 break;
6967
6968 /* transfer MODishness etc from LHS arg to RHS arg */
6969 oright->op_flags = oleft->op_flags;
6970 o->op_private |= OPpSORT_INPLACE;
6971
6972 /* excise push->gv->rv2av->null->aassign */
6973 o2 = o->op_next->op_next;
6974 op_null(o2); /* PUSHMARK */
6975 o2 = o2->op_next;
6976 if (o2->op_type == OP_GV) {
6977 op_null(o2); /* GV */
6978 o2 = o2->op_next;
6979 }
6980 op_null(o2); /* RV2AV or PADAV */
6981 o2 = o2->op_next->op_next;
6982 op_null(o2); /* AASSIGN */
6983
6984 o->op_next = o2->op_next;
6985
6986 break;
6987 }
ef3e5ea9
NC		 6988
6989 case OP_REVERSE: {
e682d7b7 6990 OP *ourmark, *theirmark, *ourlast, *iter, *expushmark, *rv2av;
ce335f37 6991 OP *gvop = NULL;
ef3e5ea9
NC		 6992 LISTOP *enter, *exlist;
6993 o->op_opt = 1;
6994
6995 enter = (LISTOP *) o->op_next;
6996 if (!enter)
6997 break;
6998 if (enter->op_type == OP_NULL) {
6999 enter = (LISTOP *) enter->op_next;
7000 if (!enter)
7001 break;
7002 }
d46f46af
NC		 7003 /* for $a (...) will have OP_GV then OP_RV2GV here.
7004 for (...) just has an OP_GV. */
ce335f37
NC		 7005 if (enter->op_type == OP_GV) {
7006 gvop = (OP *) enter;
7007 enter = (LISTOP *) enter->op_next;
7008 if (!enter)
7009 break;
d46f46af
NC		 7010 if (enter->op_type == OP_RV2GV) {
7011 enter = (LISTOP *) enter->op_next;
7012 if (!enter)
ce335f37 7013 break;
d46f46af 7014 }
ce335f37
NC		 7015 }
7016
ef3e5ea9
NC		 7017 if (enter->op_type != OP_ENTERITER)
7018 break;
7019
7020 iter = enter->op_next;
7021 if (!iter || iter->op_type != OP_ITER)
7022 break;
7023
ce335f37
NC		 7024 expushmark = enter->op_first;
7025 if (!expushmark || expushmark->op_type != OP_NULL
7026 || expushmark->op_targ != OP_PUSHMARK)
7027 break;
7028
7029 exlist = (LISTOP *) expushmark->op_sibling;
ef3e5ea9
NC		 7030 if (!exlist || exlist->op_type != OP_NULL
7031 || exlist->op_targ != OP_LIST)
7032 break;
7033
7034 if (exlist->op_last != o) {
7035 /* Mmm. Was expecting to point back to this op. */
7036 break;
7037 }
7038 theirmark = exlist->op_first;
7039 if (!theirmark || theirmark->op_type != OP_PUSHMARK)
7040 break;
7041
c491ecac 7042 if (theirmark->op_sibling != o) {
ef3e5ea9
NC		 7043 /* There's something between the mark and the reverse, eg
7044 for (1, reverse (...))
7045 so no go. */
7046 break;
7047 }
7048
c491ecac
NC		 7049 ourmark = ((LISTOP *)o)->op_first;
7050 if (!ourmark || ourmark->op_type != OP_PUSHMARK)
7051 break;
7052
ef3e5ea9
NC		 7053 ourlast = ((LISTOP *)o)->op_last;
7054 if (!ourlast || ourlast->op_next != o)
7055 break;
7056
e682d7b7
NC		 7057 rv2av = ourmark->op_sibling;
7058 if (rv2av && rv2av->op_type == OP_RV2AV && rv2av->op_sibling == 0
7059 && rv2av->op_flags == (OPf_WANT_LIST | OPf_KIDS)
7060 && enter->op_flags == (OPf_WANT_LIST | OPf_KIDS)) {
7061 /* We're just reversing a single array. */
7062 rv2av->op_flags = OPf_WANT_SCALAR | OPf_KIDS | OPf_REF;
7063 enter->op_flags |= OPf_STACKED;
7064 }
7065
ef3e5ea9
NC		 7066 /* We don't have control over who points to theirmark, so sacrifice
7067 ours. */
7068 theirmark->op_next = ourmark->op_next;
7069 theirmark->op_flags = ourmark->op_flags;
ce335f37 7070 ourlast->op_next = gvop ? gvop : (OP *) enter;
ef3e5ea9
NC		 7071 op_null(ourmark);
7072 op_null(o);
7073 enter->op_private |= OPpITER_REVERSED;
7074 iter->op_private |= OPpITER_REVERSED;
7075
7076 break;
7077 }
fe1bc4cf 7078
79072805 7079 default:
2814eb74 7080 o->op_opt = 1;
79072805
LW		 7081 break;
7082 }
a0d0e21e 7083 oldop = o;
79072805 7084 }
a0d0e21e 7085 LEAVE;
79072805 7086}
beab0874 7087
1cb0ed9b
RGS		 7088char*
7089Perl_custom_op_name(pTHX_ const OP* o)
53e06cf0 7090{
e1ec3a88 7091 const IV index = PTR2IV(o->op_ppaddr);
53e06cf0
SC		 7092 SV* keysv;
7093 HE* he;
7094
7095 if (!PL_custom_op_names) /* This probably shouldn't happen */
27da23d5 7096 return (char *)PL_op_name[OP_CUSTOM];
53e06cf0
SC		 7097
7098 keysv = sv_2mortal(newSViv(index));
7099
7100 he = hv_fetch_ent(PL_custom_op_names, keysv, 0, 0);
7101 if (!he)
27da23d5 7102 return (char *)PL_op_name[OP_CUSTOM]; /* Don't know who you are */
53e06cf0
SC		 7103
7104 return SvPV_nolen(HeVAL(he));
7105}
7106
1cb0ed9b
RGS		 7107char*
7108Perl_custom_op_desc(pTHX_ const OP* o)
53e06cf0 7109{
e1ec3a88 7110 const IV index = PTR2IV(o->op_ppaddr);
53e06cf0
SC		 7111 SV* keysv;
7112 HE* he;
7113
7114 if (!PL_custom_op_descs)
27da23d5 7115 return (char *)PL_op_desc[OP_CUSTOM];
53e06cf0
SC		 7116
7117 keysv = sv_2mortal(newSViv(index));
7118
7119 he = hv_fetch_ent(PL_custom_op_descs, keysv, 0, 0);
7120 if (!he)
27da23d5 7121 return (char *)PL_op_desc[OP_CUSTOM];
53e06cf0
SC		 7122
7123 return SvPV_nolen(HeVAL(he));
7124}
19e8ce8e 7125
beab0874
JT		 7126#include "XSUB.h"
7127
7128/* Efficient sub that returns a constant scalar value. */
7129static void
acfe0abc 7130const_sv_xsub(pTHX_ CV* cv)
beab0874
JT		 7131{
7132 dXSARGS;
9cbac4c7
DM		 7133 if (items != 0) {
7134#if 0
7135 Perl_croak(aTHX_ "usage: %s::%s()",
bfcb3514 7136 HvNAME_get(GvSTASH(CvGV(cv))), GvNAME(CvGV(cv)));
9cbac4c7
DM		 7137#endif
7138 }
9a049f1c 7139 EXTEND(sp, 1);
0768512c 7140 ST(0) = (SV*)XSANY.any_ptr;
beab0874
JT		 7141 XSRETURN(1);
7142}
4946a0fa
NC		 7143
7144/*
7145 * Local variables:
7146 * c-indentation-style: bsd
7147 * c-basic-offset: 4
7148 * indent-tabs-mode: t
7149 * End:
7150 *
37442d52
RGS		 7151 * ex: set ts=8 sts=4 sw=4 noet:
7152 */
Unnamed repository; edit this file 'description' to name the repository.