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Add error checks after execing PL_cshname or PL_sh_path
[perl5.git] / op.c
CommitLineData
a0d0e21e 1/* op.c
79072805 2 *
4bb101f2 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
acde74e1 4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 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
06e0342d 76/* To implement user lexical pragmas, there needs to be a way at run time to
b3ca2e83
NC		 77 get the compile time state of %^H for that block. Storing %^H in every
78 block (or even COP) would be very expensive, so a different approach is
79 taken. The (running) state of %^H is serialised into a tree of HE-like
80 structs. Stores into %^H are chained onto the current leaf as a struct
81 refcounted_he * with the key and the value. Deletes from %^H are saved
82 with a value of PL_sv_placeholder. The state of %^H at any point can be
83 turned back into a regular HV by walking back up the tree from that point's
06e0342d 84 leaf, ignoring any key you've already seen (placeholder or not), storing
b3ca2e83
NC		 85 the rest into the HV structure, then removing the placeholders. Hence
86 memory is only used to store the %^H deltas from the enclosing COP, rather
87 than the entire %^H on each COP.
88
89 To cause actions on %^H to write out the serialisation records, it has
90 magic type 'H'. This magic (itself) does nothing, but its presence causes
91 the values to gain magic type 'h', which has entries for set and clear.
c28fe1ec 92 C<Perl_magic_sethint> updates C<PL_compiling.cop_hints_hash> with a store
b3ca2e83 93 record, with deletes written by C<Perl_magic_clearhint>. C<SAVE_HINTS>
c28fe1ec
NC		 94 saves the current C<PL_compiling.cop_hints_hash> on the save stack, so that
95 it will be correctly restored when any inner compiling scope is exited.
b3ca2e83
NC		 96*/
97
79072805 98#include "EXTERN.h"
864dbfa3 99#define PERL_IN_OP_C
79072805 100#include "perl.h"
77ca0c92 101#include "keywords.h"
79072805 102
a07e034d 103#define CALL_PEEP(o) CALL_FPTR(PL_peepp)(aTHX_ o)
a2efc822 104
238a4c30
NIS		 105#if defined(PL_OP_SLAB_ALLOC)
106
107#ifndef PERL_SLAB_SIZE
108#define PERL_SLAB_SIZE 2048
109#endif
110
c7e45529
AE		 111void *
112Perl_Slab_Alloc(pTHX_ int m, size_t sz)
1c846c1f 113{
5a8e194f
NIS		 114 /*
115 * To make incrementing use count easy PL_OpSlab is an I32 *
116 * To make inserting the link to slab PL_OpPtr is I32 **
117 * So compute size in units of sizeof(I32 *) as that is how Pl_OpPtr increments
118 * Add an overhead for pointer to slab and round up as a number of pointers
119 */
120 sz = (sz + 2*sizeof(I32 *) -1)/sizeof(I32 *);
238a4c30 121 if ((PL_OpSpace -= sz) < 0) {
083fcd59
JH		 122 PL_OpPtr = (I32 **) PerlMemShared_malloc(PERL_SLAB_SIZE*sizeof(I32*));
123 if (!PL_OpPtr) {
238a4c30
NIS		 124 return NULL;
125 }
5a8e194f
NIS		 126 Zero(PL_OpPtr,PERL_SLAB_SIZE,I32 **);
127 /* We reserve the 0'th I32 sized chunk as a use count */
128 PL_OpSlab = (I32 *) PL_OpPtr;
129 /* Reduce size by the use count word, and by the size we need.
130 * Latter is to mimic the '-=' in the if() above
131 */
132 PL_OpSpace = PERL_SLAB_SIZE - (sizeof(I32)+sizeof(I32 **)-1)/sizeof(I32 **) - sz;
238a4c30
NIS		 133 /* Allocation pointer starts at the top.
134 Theory: because we build leaves before trunk allocating at end
135 means that at run time access is cache friendly upward
136 */
5a8e194f 137 PL_OpPtr += PERL_SLAB_SIZE;
238a4c30
NIS		 138 }
139 assert( PL_OpSpace >= 0 );
140 /* Move the allocation pointer down */
141 PL_OpPtr -= sz;
5a8e194f 142 assert( PL_OpPtr > (I32 **) PL_OpSlab );
238a4c30
NIS		 143 *PL_OpPtr = PL_OpSlab; /* Note which slab it belongs to */
144 (*PL_OpSlab)++; /* Increment use count of slab */
5a8e194f 145 assert( PL_OpPtr+sz <= ((I32 **) PL_OpSlab + PERL_SLAB_SIZE) );
238a4c30
NIS		 146 assert( *PL_OpSlab > 0 );
147 return (void *)(PL_OpPtr + 1);
148}
149
c7e45529
AE		 150void
151Perl_Slab_Free(pTHX_ void *op)
238a4c30 152{
551405c4 153 I32 * const * const ptr = (I32 **) op;
aec46f14 154 I32 * const slab = ptr[-1];
5a8e194f
NIS		 155 assert( ptr-1 > (I32 **) slab );
156 assert( ptr < ( (I32 **) slab + PERL_SLAB_SIZE) );
238a4c30
NIS		 157 assert( *slab > 0 );
158 if (--(*slab) == 0) {
7e4e8c89
NC		 159# ifdef NETWARE
160# define PerlMemShared PerlMem
161# endif
083fcd59
JH		 162
163 PerlMemShared_free(slab);
238a4c30
NIS		 164 if (slab == PL_OpSlab) {
165 PL_OpSpace = 0;
166 }
167 }
b7dc083c 168}
b7dc083c 169#endif
e50aee73 170/*
ce6f1cbc 171 * In the following definition, the ", (OP*)0" is just to make the compiler
a5f75d66 172 * think the expression is of the right type: croak actually does a Siglongjmp.
e50aee73 173 */
11343788 174#define CHECKOP(type,o) \
ce6f1cbc 175 ((PL_op_mask && PL_op_mask[type]) \
5dc0d613 176 ? ( op_free((OP*)o), \
cb77fdf0 177 Perl_croak(aTHX_ "'%s' trapped by operation mask", PL_op_desc[type]), \
ce6f1cbc 178 (OP*)0 ) \
fc0dc3b3 179 : CALL_FPTR(PL_check[type])(aTHX_ (OP*)o))
e50aee73 180
e6438c1a 181#define RETURN_UNLIMITED_NUMBER (PERL_INT_MAX / 2)
c53d7c7d 182
8b6b16e7 183STATIC const char*
cea2e8a9 184S_gv_ename(pTHX_ GV *gv)
4633a7c4 185{
46c461b5 186 SV* const tmpsv = sv_newmortal();
bd61b366 187 gv_efullname3(tmpsv, gv, NULL);
8b6b16e7 188 return SvPV_nolen_const(tmpsv);
4633a7c4
LW		 189}
190
76e3520e 191STATIC OP *
cea2e8a9 192S_no_fh_allowed(pTHX_ OP *o)
79072805 193{
cea2e8a9 194 yyerror(Perl_form(aTHX_ "Missing comma after first argument to %s function",
53e06cf0 195 OP_DESC(o)));
11343788 196 return o;
79072805
LW		 197}
198
76e3520e 199STATIC OP *
bfed75c6 200S_too_few_arguments(pTHX_ OP *o, const char *name)
79072805 201{
cea2e8a9 202 yyerror(Perl_form(aTHX_ "Not enough arguments for %s", name));
11343788 203 return o;
79072805
LW		 204}
205
76e3520e 206STATIC OP *
bfed75c6 207S_too_many_arguments(pTHX_ OP *o, const char *name)
79072805 208{
cea2e8a9 209 yyerror(Perl_form(aTHX_ "Too many arguments for %s", name));
11343788 210 return o;
79072805
LW		 211}
212
76e3520e 213STATIC void
6867be6d 214S_bad_type(pTHX_ I32 n, const char *t, const char *name, const OP *kid)
8990e307 215{
cea2e8a9 216 yyerror(Perl_form(aTHX_ "Type of arg %d to %s must be %s (not %s)",
53e06cf0 217 (int)n, name, t, OP_DESC(kid)));
8990e307
LW		 218}
219
7a52d87a 220STATIC void
6867be6d 221S_no_bareword_allowed(pTHX_ const OP *o)
7a52d87a 222{
eb8433b7
NC		 223 if (PL_madskills)
224 return; /* various ok barewords are hidden in extra OP_NULL */
5a844595 225 qerror(Perl_mess(aTHX_
35c1215d 226 "Bareword \"%"SVf"\" not allowed while \"strict subs\" in use",
95b63a38 227 (void*)cSVOPo_sv));
7a52d87a
GS		 228}
229
79072805
LW		 230/* "register" allocation */
231
232PADOFFSET
262cbcdb 233Perl_allocmy(pTHX_ const char *const name)
93a17b20 234{
97aff369 235 dVAR;
a0d0e21e 236 PADOFFSET off;
3edf23ff 237 const bool is_our = (PL_in_my == KEY_our);
a0d0e21e 238
59f00321 239 /* complain about "my $<special_var>" etc etc */
6b58708b 240 if (*name &&
3edf23ff 241 !(is_our ||
155aba94 242 isALPHA(name[1]) ||
39e02b42 243 (USE_UTF8_IN_NAMES && UTF8_IS_START(name[1])) ||
6b58708b 244 (name[1] == '_' && (*name == '$' || name[2]))))
834a4ddd 245 {
6b58708b 246 /* name[2] is true if strlen(name) > 2 */
c4d0567e 247 if (!isPRINT(name[1]) || strchr("\t\n\r\f", name[1])) {
d1544d85
NC		 248 yyerror(Perl_form(aTHX_ "Can't use global %c^%c%s in \"my\"",
249 name[0], toCTRL(name[1]), name + 2));
250 } else {
251 yyerror(Perl_form(aTHX_ "Can't use global %s in \"my\"",name));
46fc3d4c 252 }
a0d0e21e 253 }
748a9306 254
dd2155a4 255 /* check for duplicate declaration */
3edf23ff 256 pad_check_dup(name, is_our, (PL_curstash ? PL_curstash : PL_defstash));
33b8ce05 257
dd2155a4
DM		 258 if (PL_in_my_stash && *name != '$') {
259 yyerror(Perl_form(aTHX_
260 "Can't declare class for non-scalar %s in \"%s\"",
952306ac
RGS		 261 name,
262 is_our ? "our" : PL_in_my == KEY_state ? "state" : "my"));
6b35e009
GS		 263 }
264
dd2155a4 265 /* allocate a spare slot and store the name in that slot */
93a17b20 266
dd2155a4
DM		 267 off = pad_add_name(name,
268 PL_in_my_stash,
3edf23ff 269 (is_our
133706a6
RGS		 270 /* $_ is always in main::, even with our */
271 ? (PL_curstash && !strEQ(name,"$_") ? PL_curstash : PL_defstash)
5c284bb0 272 : NULL
dd2155a4 273 ),
952306ac
RGS		 274 0, /* not fake */
275 PL_in_my == KEY_state
dd2155a4
DM		 276 );
277 return off;
79072805
LW		 278}
279
79072805
LW		 280/* Destructor */
281
282void
864dbfa3 283Perl_op_free(pTHX_ OP *o)
79072805 284{
27da23d5 285 dVAR;
acb36ea4 286 OPCODE type;
79072805 287
2814eb74 288 if (!o || o->op_static)
79072805
LW		 289 return;
290
67566ccd 291 type = o->op_type;
7934575e 292 if (o->op_private & OPpREFCOUNTED) {
67566ccd 293 switch (type) {
7934575e
GS		 294 case OP_LEAVESUB:
295 case OP_LEAVESUBLV:
296 case OP_LEAVEEVAL:
297 case OP_LEAVE:
298 case OP_SCOPE:
299 case OP_LEAVEWRITE:
67566ccd
AL		 300 {
301 PADOFFSET refcnt;
7934575e 302 OP_REFCNT_LOCK;
4026c95a 303 refcnt = OpREFCNT_dec(o);
7934575e 304 OP_REFCNT_UNLOCK;
4026c95a
SH		 305 if (refcnt)
306 return;
67566ccd 307 }
7934575e
GS		 308 break;
309 default:
310 break;
311 }
312 }
313
11343788 314 if (o->op_flags & OPf_KIDS) {
6867be6d 315 register OP *kid, *nextkid;
11343788 316 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 317 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 318 op_free(kid);
85e6fe83 319 }
79072805 320 }
acb36ea4 321 if (type == OP_NULL)
eb160463 322 type = (OPCODE)o->op_targ;
acb36ea4
GS		 323
324 /* COP* is not cleared by op_clear() so that we may track line
325 * numbers etc even after null() */
326 if (type == OP_NEXTSTATE || type == OP_SETSTATE || type == OP_DBSTATE)
327 cop_free((COP*)o);
328
329 op_clear(o);
238a4c30 330 FreeOp(o);
4d494880
DM		 331#ifdef DEBUG_LEAKING_SCALARS
332 if (PL_op == o)
5f66b61c 333 PL_op = NULL;
4d494880 334#endif
acb36ea4 335}
79072805 336
93c66552
DM		 337void
338Perl_op_clear(pTHX_ OP *o)
acb36ea4 339{
13137afc 340
27da23d5 341 dVAR;
eb8433b7
NC		 342#ifdef PERL_MAD
343 /* if (o->op_madprop && o->op_madprop->mad_next)
344 abort(); */
3cc8d589
NC		 345 /* FIXME for MAD - if I uncomment these two lines t/op/pack.t fails with
346 "modification of a read only value" for a reason I can't fathom why.
347 It's the "" stringification of $_, where $_ was set to '' in a foreach
04a4d38e
NC		 348 loop, but it defies simplification into a small test case.
349 However, commenting them out has caused ext/List/Util/t/weak.t to fail
350 the last test. */
3cc8d589
NC		 351 /*
352 mad_free(o->op_madprop);
353 o->op_madprop = 0;
354 */
eb8433b7
NC		 355#endif
356
357 retry:
11343788 358 switch (o->op_type) {
acb36ea4 359 case OP_NULL: /* Was holding old type, if any. */
eb8433b7
NC		 360 if (PL_madskills && o->op_targ != OP_NULL) {
361 o->op_type = o->op_targ;
362 o->op_targ = 0;
363 goto retry;
364 }
acb36ea4 365 case OP_ENTEREVAL: /* Was holding hints. */
acb36ea4 366 o->op_targ = 0;
a0d0e21e 367 break;
a6006777 368 default:
ac4c12e7 369 if (!(o->op_flags & OPf_REF)
0b94c7bb 370 || (PL_check[o->op_type] != MEMBER_TO_FPTR(Perl_ck_ftst)))
a6006777 371 break;
372 /* FALL THROUGH */
463ee0b2 373 case OP_GVSV:
79072805 374 case OP_GV:
a6006777 375 case OP_AELEMFAST:
6a077020
DM		 376 if (! (o->op_type == OP_AELEMFAST && o->op_flags & OPf_SPECIAL)) {
377 /* not an OP_PADAV replacement */
350de78d 378#ifdef USE_ITHREADS
6a077020
DM		 379 if (cPADOPo->op_padix > 0) {
380 /* No GvIN_PAD_off(cGVOPo_gv) here, because other references
381 * may still exist on the pad */
382 pad_swipe(cPADOPo->op_padix, TRUE);
383 cPADOPo->op_padix = 0;
384 }
350de78d 385#else
6a077020 386 SvREFCNT_dec(cSVOPo->op_sv);
a0714e2c 387 cSVOPo->op_sv = NULL;
350de78d 388#endif
6a077020 389 }
79072805 390 break;
a1ae71d2 391 case OP_METHOD_NAMED:
79072805 392 case OP_CONST:
11343788 393 SvREFCNT_dec(cSVOPo->op_sv);
a0714e2c 394 cSVOPo->op_sv = NULL;
3b1c21fa
AB		 395#ifdef USE_ITHREADS
396 /** Bug #15654
397 Even if op_clear does a pad_free for the target of the op,
6a077020 398 pad_free doesn't actually remove the sv that exists in the pad;
3b1c21fa
AB		 399 instead it lives on. This results in that it could be reused as
400 a target later on when the pad was reallocated.
401 **/
402 if(o->op_targ) {
403 pad_swipe(o->op_targ,1);
404 o->op_targ = 0;
405 }
406#endif
79072805 407 break;
748a9306
LW		 408 case OP_GOTO:
409 case OP_NEXT:
410 case OP_LAST:
411 case OP_REDO:
11343788 412 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 413 break;
414 /* FALL THROUGH */
a0d0e21e 415 case OP_TRANS:
acb36ea4 416 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
a0ed51b3 417 SvREFCNT_dec(cSVOPo->op_sv);
a0714e2c 418 cSVOPo->op_sv = NULL;
acb36ea4
GS		 419 }
420 else {
a0ed51b3 421 Safefree(cPVOPo->op_pv);
bd61b366 422 cPVOPo->op_pv = NULL;
acb36ea4 423 }
a0d0e21e
LW		 424 break;
425 case OP_SUBST:
11343788 426 op_free(cPMOPo->op_pmreplroot);
971a9dd3 427 goto clear_pmop;
748a9306 428 case OP_PUSHRE:
971a9dd3 429#ifdef USE_ITHREADS
ba89bb6e 430 if (INT2PTR(PADOFFSET, cPMOPo->op_pmreplroot)) {
dd2155a4
DM		 431 /* No GvIN_PAD_off here, because other references may still
432 * exist on the pad */
433 pad_swipe(INT2PTR(PADOFFSET, cPMOPo->op_pmreplroot), TRUE);
971a9dd3
GS		 434 }
435#else
436 SvREFCNT_dec((SV*)cPMOPo->op_pmreplroot);
437#endif
438 /* FALL THROUGH */
a0d0e21e 439 case OP_MATCH:
8782bef2 440 case OP_QR:
971a9dd3 441clear_pmop:
cb55de95 442 {
551405c4 443 HV * const pmstash = PmopSTASH(cPMOPo);
0565a181 444 if (pmstash && !SvIS_FREED(pmstash)) {
551405c4 445 MAGIC * const mg = mg_find((SV*)pmstash, PERL_MAGIC_symtab);
8d2f4536
NC		 446 if (mg) {
447 PMOP *pmop = (PMOP*) mg->mg_obj;
448 PMOP *lastpmop = NULL;
449 while (pmop) {
450 if (cPMOPo == pmop) {
451 if (lastpmop)
452 lastpmop->op_pmnext = pmop->op_pmnext;
453 else
454 mg->mg_obj = (SV*) pmop->op_pmnext;
455 break;
456 }
457 lastpmop = pmop;
458 pmop = pmop->op_pmnext;
cb55de95 459 }
cb55de95 460 }
83da49e6 461 }
05ec9bb3 462 PmopSTASH_free(cPMOPo);
cb55de95 463 }
5f66b61c 464 cPMOPo->op_pmreplroot = NULL;
5f8cb046
DM		 465 /* we use the "SAFE" version of the PM_ macros here
466 * since sv_clean_all might release some PMOPs
467 * after PL_regex_padav has been cleared
468 * and the clearing of PL_regex_padav needs to
469 * happen before sv_clean_all
470 */
471 ReREFCNT_dec(PM_GETRE_SAFE(cPMOPo));
5f66b61c 472 PM_SETRE_SAFE(cPMOPo, NULL);
13137afc
AB		 473#ifdef USE_ITHREADS
474 if(PL_regex_pad) { /* We could be in destruction */
475 av_push((AV*) PL_regex_pad[0],(SV*) PL_regex_pad[(cPMOPo)->op_pmoffset]);
1cc8b4c5 476 SvREPADTMP_on(PL_regex_pad[(cPMOPo)->op_pmoffset]);
13137afc
AB		 477 PM_SETRE(cPMOPo, (cPMOPo)->op_pmoffset);
478 }
1eb1540c 479#endif
13137afc 480
a0d0e21e 481 break;
79072805
LW		 482 }
483
743e66e6 484 if (o->op_targ > 0) {
11343788 485 pad_free(o->op_targ);
743e66e6
GS		 486 o->op_targ = 0;
487 }
79072805
LW		 488}
489
76e3520e 490STATIC void
3eb57f73
HS		 491S_cop_free(pTHX_ COP* cop)
492{
05ec9bb3
NIS		 493 Safefree(cop->cop_label); /* FIXME: treaddead ??? */
494 CopFILE_free(cop);
495 CopSTASH_free(cop);
0453d815 496 if (! specialWARN(cop->cop_warnings))
72dc9ed5 497 PerlMemShared_free(cop->cop_warnings);
c28fe1ec 498 Perl_refcounted_he_free(aTHX_ cop->cop_hints_hash);
3eb57f73
HS		 499}
500
93c66552
DM		 501void
502Perl_op_null(pTHX_ OP *o)
8990e307 503{
27da23d5 504 dVAR;
acb36ea4
GS		 505 if (o->op_type == OP_NULL)
506 return;
eb8433b7
NC		 507 if (!PL_madskills)
508 op_clear(o);
11343788
MB		 509 o->op_targ = o->op_type;
510 o->op_type = OP_NULL;
22c35a8c 511 o->op_ppaddr = PL_ppaddr[OP_NULL];
8990e307
LW		 512}
513
4026c95a
SH		 514void
515Perl_op_refcnt_lock(pTHX)
516{
27da23d5 517 dVAR;
96a5add6 518 PERL_UNUSED_CONTEXT;
4026c95a
SH		 519 OP_REFCNT_LOCK;
520}
521
522void
523Perl_op_refcnt_unlock(pTHX)
524{
27da23d5 525 dVAR;
96a5add6 526 PERL_UNUSED_CONTEXT;
4026c95a
SH		 527 OP_REFCNT_UNLOCK;
528}
529
79072805
LW		 530/* Contextualizers */
531
463ee0b2 532#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 533
534OP *
864dbfa3 535Perl_linklist(pTHX_ OP *o)
79072805 536{
3edf23ff 537 OP *first;
79072805 538
11343788
MB		 539 if (o->op_next)
540 return o->op_next;
79072805
LW		 541
542 /* establish postfix order */
3edf23ff
AL		 543 first = cUNOPo->op_first;
544 if (first) {
6867be6d 545 register OP *kid;
3edf23ff
AL		 546 o->op_next = LINKLIST(first);
547 kid = first;
548 for (;;) {
549 if (kid->op_sibling) {
79072805 550 kid->op_next = LINKLIST(kid->op_sibling);
3edf23ff
AL		 551 kid = kid->op_sibling;
552 } else {
11343788 553 kid->op_next = o;
3edf23ff
AL		 554 break;
555 }
79072805
LW		 556 }
557 }
558 else
11343788 559 o->op_next = o;
79072805 560
11343788 561 return o->op_next;
79072805
LW		 562}
563
564OP *
864dbfa3 565Perl_scalarkids(pTHX_ OP *o)
79072805 566{
11343788 567 if (o && o->op_flags & OPf_KIDS) {
bfed75c6 568 OP *kid;
11343788 569 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 570 scalar(kid);
571 }
11343788 572 return o;
79072805
LW		 573}
574
76e3520e 575STATIC OP *
cea2e8a9 576S_scalarboolean(pTHX_ OP *o)
8990e307 577{
97aff369 578 dVAR;
d008e5eb 579 if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
d008e5eb 580 if (ckWARN(WARN_SYNTAX)) {
6867be6d 581 const line_t oldline = CopLINE(PL_curcop);
a0d0e21e 582
d008e5eb 583 if (PL_copline != NOLINE)
57843af0 584 CopLINE_set(PL_curcop, PL_copline);
9014280d 585 Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Found = in conditional, should be ==");
57843af0 586 CopLINE_set(PL_curcop, oldline);
d008e5eb 587 }
a0d0e21e 588 }
11343788 589 return scalar(o);
8990e307
LW		 590}
591
592OP *
864dbfa3 593Perl_scalar(pTHX_ OP *o)
79072805 594{
27da23d5 595 dVAR;
79072805
LW		 596 OP *kid;
597
a0d0e21e 598 /* assumes no premature commitment */
551405c4 599 if (!o || PL_error_count || (o->op_flags & OPf_WANT)
5dc0d613 600 || o->op_type == OP_RETURN)
7e363e51 601 {
11343788 602 return o;
7e363e51 603 }
79072805 604
5dc0d613 605 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 606
11343788 607 switch (o->op_type) {
79072805 608 case OP_REPEAT:
11343788 609 scalar(cBINOPo->op_first);
8990e307 610 break;
79072805
LW		 611 case OP_OR:
612 case OP_AND:
613 case OP_COND_EXPR:
11343788 614 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 615 scalar(kid);
79072805 616 break;
a0d0e21e 617 case OP_SPLIT:
11343788 618 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e 619 if (!kPMOP->op_pmreplroot)
12bcd1a6 620 deprecate_old("implicit split to @_");
a0d0e21e
LW		 621 }
622 /* FALL THROUGH */
79072805 623 case OP_MATCH:
8782bef2 624 case OP_QR:
79072805
LW		 625 case OP_SUBST:
626 case OP_NULL:
8990e307 627 default:
11343788
MB		 628 if (o->op_flags & OPf_KIDS) {
629 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 630 scalar(kid);
631 }
79072805
LW		 632 break;
633 case OP_LEAVE:
634 case OP_LEAVETRY:
5dc0d613 635 kid = cLISTOPo->op_first;
54310121 636 scalar(kid);
155aba94 637 while ((kid = kid->op_sibling)) {
54310121 638 if (kid->op_sibling)
639 scalarvoid(kid);
640 else
641 scalar(kid);
642 }
3280af22 643 WITH_THR(PL_curcop = &PL_compiling);
54310121 644 break;
748a9306 645 case OP_SCOPE:
79072805 646 case OP_LINESEQ:
8990e307 647 case OP_LIST:
11343788 648 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 649 if (kid->op_sibling)
650 scalarvoid(kid);
651 else
652 scalar(kid);
653 }
3280af22 654 WITH_THR(PL_curcop = &PL_compiling);
79072805 655 break;
a801c63c
RGS		 656 case OP_SORT:
657 if (ckWARN(WARN_VOID))
9014280d 658 Perl_warner(aTHX_ packWARN(WARN_VOID), "Useless use of sort in scalar context");
79072805 659 }
11343788 660 return o;
79072805
LW		 661}
662
663OP *
864dbfa3 664Perl_scalarvoid(pTHX_ OP *o)
79072805 665{
27da23d5 666 dVAR;
79072805 667 OP *kid;
c445ea15 668 const char* useless = NULL;
8990e307 669 SV* sv;
2ebea0a1
GS		 670 U8 want;
671
eb8433b7
NC		 672 /* trailing mad null ops don't count as "there" for void processing */
673 if (PL_madskills &&
674 o->op_type != OP_NULL &&
675 o->op_sibling &&
676 o->op_sibling->op_type == OP_NULL)
677 {
678 OP *sib;
679 for (sib = o->op_sibling;
680 sib && sib->op_type == OP_NULL;
681 sib = sib->op_sibling) ;
682
683 if (!sib)
684 return o;
685 }
686
acb36ea4
GS		 687 if (o->op_type == OP_NEXTSTATE
688 || o->op_type == OP_SETSTATE
689 || o->op_type == OP_DBSTATE
690 || (o->op_type == OP_NULL && (o->op_targ == OP_NEXTSTATE
691 || o->op_targ == OP_SETSTATE
692 || o->op_targ == OP_DBSTATE)))
2ebea0a1 693 PL_curcop = (COP*)o; /* for warning below */
79072805 694
54310121 695 /* assumes no premature commitment */
2ebea0a1
GS		 696 want = o->op_flags & OPf_WANT;
697 if ((want && want != OPf_WANT_SCALAR) || PL_error_count
5dc0d613 698 || o->op_type == OP_RETURN)
7e363e51 699 {
11343788 700 return o;
7e363e51 701 }
79072805 702
b162f9ea 703 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 704 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
705 {
b162f9ea 706 return scalar(o); /* As if inside SASSIGN */
7e363e51 707 }
1c846c1f 708
5dc0d613 709 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 710
11343788 711 switch (o->op_type) {
79072805 712 default:
22c35a8c 713 if (!(PL_opargs[o->op_type] & OA_FOLDCONST))
8990e307 714 break;
36477c24 715 /* FALL THROUGH */
716 case OP_REPEAT:
11343788 717 if (o->op_flags & OPf_STACKED)
8990e307 718 break;
5d82c453
GA		 719 goto func_ops;
720 case OP_SUBSTR:
721 if (o->op_private == 4)
722 break;
8990e307
LW		 723 /* FALL THROUGH */
724 case OP_GVSV:
725 case OP_WANTARRAY:
726 case OP_GV:
727 case OP_PADSV:
728 case OP_PADAV:
729 case OP_PADHV:
730 case OP_PADANY:
731 case OP_AV2ARYLEN:
8990e307 732 case OP_REF:
a0d0e21e
LW		 733 case OP_REFGEN:
734 case OP_SREFGEN:
8990e307
LW		 735 case OP_DEFINED:
736 case OP_HEX:
737 case OP_OCT:
738 case OP_LENGTH:
8990e307
LW		 739 case OP_VEC:
740 case OP_INDEX:
741 case OP_RINDEX:
742 case OP_SPRINTF:
743 case OP_AELEM:
744 case OP_AELEMFAST:
745 case OP_ASLICE:
8990e307
LW		 746 case OP_HELEM:
747 case OP_HSLICE:
748 case OP_UNPACK:
749 case OP_PACK:
8990e307
LW		 750 case OP_JOIN:
751 case OP_LSLICE:
752 case OP_ANONLIST:
753 case OP_ANONHASH:
754 case OP_SORT:
755 case OP_REVERSE:
756 case OP_RANGE:
757 case OP_FLIP:
758 case OP_FLOP:
759 case OP_CALLER:
760 case OP_FILENO:
761 case OP_EOF:
762 case OP_TELL:
763 case OP_GETSOCKNAME:
764 case OP_GETPEERNAME:
765 case OP_READLINK:
766 case OP_TELLDIR:
767 case OP_GETPPID:
768 case OP_GETPGRP:
769 case OP_GETPRIORITY:
770 case OP_TIME:
771 case OP_TMS:
772 case OP_LOCALTIME:
773 case OP_GMTIME:
774 case OP_GHBYNAME:
775 case OP_GHBYADDR:
776 case OP_GHOSTENT:
777 case OP_GNBYNAME:
778 case OP_GNBYADDR:
779 case OP_GNETENT:
780 case OP_GPBYNAME:
781 case OP_GPBYNUMBER:
782 case OP_GPROTOENT:
783 case OP_GSBYNAME:
784 case OP_GSBYPORT:
785 case OP_GSERVENT:
786 case OP_GPWNAM:
787 case OP_GPWUID:
788 case OP_GGRNAM:
789 case OP_GGRGID:
790 case OP_GETLOGIN:
78e1b766 791 case OP_PROTOTYPE:
5d82c453 792 func_ops:
64aac5a9 793 if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO)))
53e06cf0 794 useless = OP_DESC(o);
8990e307
LW		 795 break;
796
9f82cd5f
YST		 797 case OP_NOT:
798 kid = cUNOPo->op_first;
799 if (kid->op_type != OP_MATCH && kid->op_type != OP_SUBST &&
800 kid->op_type != OP_TRANS) {
801 goto func_ops;
802 }
803 useless = "negative pattern binding (!~)";
804 break;
805
8990e307
LW		 806 case OP_RV2GV:
807 case OP_RV2SV:
808 case OP_RV2AV:
809 case OP_RV2HV:
192587c2 810 if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO)) &&
11343788 811 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 812 useless = "a variable";
813 break;
79072805
LW		 814
815 case OP_CONST:
7766f137 816 sv = cSVOPo_sv;
7a52d87a
GS		 817 if (cSVOPo->op_private & OPpCONST_STRICT)
818 no_bareword_allowed(o);
819 else {
d008e5eb
GS		 820 if (ckWARN(WARN_VOID)) {
821 useless = "a constant";
2e0ae2d3 822 if (o->op_private & OPpCONST_ARYBASE)
d4c19fe8 823 useless = NULL;
e7fec78e 824 /* don't warn on optimised away booleans, eg
b5a930ec 825 * use constant Foo, 5; Foo || print; */
e7fec78e 826 if (cSVOPo->op_private & OPpCONST_SHORTCIRCUIT)
d4c19fe8 827 useless = NULL;
960b4253
MG		 828 /* the constants 0 and 1 are permitted as they are
829 conventionally used as dummies in constructs like
830 1 while some_condition_with_side_effects; */
e7fec78e 831 else if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
d4c19fe8 832 useless = NULL;
d008e5eb 833 else if (SvPOK(sv)) {
a52fe3ac
A		 834 /* perl4's way of mixing documentation and code
835 (before the invention of POD) was based on a
836 trick to mix nroff and perl code. The trick was
837 built upon these three nroff macros being used in
838 void context. The pink camel has the details in
839 the script wrapman near page 319. */
6136c704
AL		 840 const char * const maybe_macro = SvPVX_const(sv);
841 if (strnEQ(maybe_macro, "di", 2) ||
842 strnEQ(maybe_macro, "ds", 2) ||
843 strnEQ(maybe_macro, "ig", 2))
d4c19fe8 844 useless = NULL;
d008e5eb 845 }
8990e307
LW		 846 }
847 }
93c66552 848 op_null(o); /* don't execute or even remember it */
79072805
LW		 849 break;
850
851 case OP_POSTINC:
11343788 852 o->op_type = OP_PREINC; /* pre-increment is faster */
22c35a8c 853 o->op_ppaddr = PL_ppaddr[OP_PREINC];
79072805
LW		 854 break;
855
856 case OP_POSTDEC:
11343788 857 o->op_type = OP_PREDEC; /* pre-decrement is faster */
22c35a8c 858 o->op_ppaddr = PL_ppaddr[OP_PREDEC];
79072805
LW		 859 break;
860
679d6c4e
HS		 861 case OP_I_POSTINC:
862 o->op_type = OP_I_PREINC; /* pre-increment is faster */
863 o->op_ppaddr = PL_ppaddr[OP_I_PREINC];
864 break;
865
866 case OP_I_POSTDEC:
867 o->op_type = OP_I_PREDEC; /* pre-decrement is faster */
868 o->op_ppaddr = PL_ppaddr[OP_I_PREDEC];
869 break;
870
79072805
LW		 871 case OP_OR:
872 case OP_AND:
c963b151 873 case OP_DOR:
79072805 874 case OP_COND_EXPR:
0d863452
RH		 875 case OP_ENTERGIVEN:
876 case OP_ENTERWHEN:
11343788 877 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 878 scalarvoid(kid);
879 break;
5aabfad6 880
a0d0e21e 881 case OP_NULL:
11343788 882 if (o->op_flags & OPf_STACKED)
a0d0e21e 883 break;
5aabfad6 884 /* FALL THROUGH */
2ebea0a1
GS		 885 case OP_NEXTSTATE:
886 case OP_DBSTATE:
79072805
LW		 887 case OP_ENTERTRY:
888 case OP_ENTER:
11343788 889 if (!(o->op_flags & OPf_KIDS))
79072805 890 break;
54310121 891 /* FALL THROUGH */
463ee0b2 892 case OP_SCOPE:
79072805
LW		 893 case OP_LEAVE:
894 case OP_LEAVETRY:
a0d0e21e 895 case OP_LEAVELOOP:
79072805 896 case OP_LINESEQ:
79072805 897 case OP_LIST:
0d863452
RH		 898 case OP_LEAVEGIVEN:
899 case OP_LEAVEWHEN:
11343788 900 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 901 scalarvoid(kid);
902 break;
c90c0ff4 903 case OP_ENTEREVAL:
5196be3e 904 scalarkids(o);
c90c0ff4 905 break;
5aabfad6 906 case OP_REQUIRE:
c90c0ff4 907 /* all requires must return a boolean value */
5196be3e 908 o->op_flags &= ~OPf_WANT;
d6483035
GS		 909 /* FALL THROUGH */
910 case OP_SCALAR:
5196be3e 911 return scalar(o);
a0d0e21e 912 case OP_SPLIT:
11343788 913 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e 914 if (!kPMOP->op_pmreplroot)
12bcd1a6 915 deprecate_old("implicit split to @_");
a0d0e21e
LW		 916 }
917 break;
79072805 918 }
411caa50 919 if (useless && ckWARN(WARN_VOID))
9014280d 920 Perl_warner(aTHX_ packWARN(WARN_VOID), "Useless use of %s in void context", useless);
11343788 921 return o;
79072805
LW		 922}
923
924OP *
864dbfa3 925Perl_listkids(pTHX_ OP *o)
79072805 926{
11343788 927 if (o && o->op_flags & OPf_KIDS) {
6867be6d 928 OP *kid;
11343788 929 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 930 list(kid);
931 }
11343788 932 return o;
79072805
LW		 933}
934
935OP *
864dbfa3 936Perl_list(pTHX_ OP *o)
79072805 937{
27da23d5 938 dVAR;
79072805
LW		 939 OP *kid;
940
a0d0e21e 941 /* assumes no premature commitment */
3280af22 942 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 943 || o->op_type == OP_RETURN)
7e363e51 944 {
11343788 945 return o;
7e363e51 946 }
79072805 947
b162f9ea 948 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 949 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
950 {
b162f9ea 951 return o; /* As if inside SASSIGN */
7e363e51 952 }
1c846c1f 953
5dc0d613 954 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 955
11343788 956 switch (o->op_type) {
79072805
LW		 957 case OP_FLOP:
958 case OP_REPEAT:
11343788 959 list(cBINOPo->op_first);
79072805
LW		 960 break;
961 case OP_OR:
962 case OP_AND:
963 case OP_COND_EXPR:
11343788 964 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 965 list(kid);
966 break;
967 default:
968 case OP_MATCH:
8782bef2 969 case OP_QR:
79072805
LW		 970 case OP_SUBST:
971 case OP_NULL:
11343788 972 if (!(o->op_flags & OPf_KIDS))
79072805 973 break;
11343788
MB		 974 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
975 list(cBINOPo->op_first);
976 return gen_constant_list(o);
79072805
LW		 977 }
978 case OP_LIST:
11343788 979 listkids(o);
79072805
LW		 980 break;
981 case OP_LEAVE:
982 case OP_LEAVETRY:
5dc0d613 983 kid = cLISTOPo->op_first;
54310121 984 list(kid);
155aba94 985 while ((kid = kid->op_sibling)) {
54310121 986 if (kid->op_sibling)
987 scalarvoid(kid);
988 else
989 list(kid);
990 }
3280af22 991 WITH_THR(PL_curcop = &PL_compiling);
54310121 992 break;
748a9306 993 case OP_SCOPE:
79072805 994 case OP_LINESEQ:
11343788 995 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 996 if (kid->op_sibling)
997 scalarvoid(kid);
998 else
999 list(kid);
1000 }
3280af22 1001 WITH_THR(PL_curcop = &PL_compiling);
79072805 1002 break;
c90c0ff4 1003 case OP_REQUIRE:
1004 /* all requires must return a boolean value */
5196be3e
MB		 1005 o->op_flags &= ~OPf_WANT;
1006 return scalar(o);
79072805 1007 }
11343788 1008 return o;
79072805
LW		 1009}
1010
1011OP *
864dbfa3 1012Perl_scalarseq(pTHX_ OP *o)
79072805 1013{
97aff369 1014 dVAR;
11343788 1015 if (o) {
1496a290
AL		 1016 const OPCODE type = o->op_type;
1017
1018 if (type == OP_LINESEQ || type == OP_SCOPE ||
1019 type == OP_LEAVE || type == OP_LEAVETRY)
463ee0b2 1020 {
6867be6d 1021 OP *kid;
11343788 1022 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1023 if (kid->op_sibling) {
463ee0b2 1024 scalarvoid(kid);
ed6116ce 1025 }
463ee0b2 1026 }
3280af22 1027 PL_curcop = &PL_compiling;
79072805 1028 }
11343788 1029 o->op_flags &= ~OPf_PARENS;
3280af22 1030 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 1031 o->op_flags |= OPf_PARENS;
79072805 1032 }
8990e307 1033 else
11343788
MB		 1034 o = newOP(OP_STUB, 0);
1035 return o;
79072805
LW		 1036}
1037
76e3520e 1038STATIC OP *
cea2e8a9 1039S_modkids(pTHX_ OP *o, I32 type)
79072805 1040{
11343788 1041 if (o && o->op_flags & OPf_KIDS) {
6867be6d 1042 OP *kid;
11343788 1043 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1044 mod(kid, type);
79072805 1045 }
11343788 1046 return o;
79072805
LW		 1047}
1048
ff7298cb 1049/* Propagate lvalue ("modifiable") context to an op and its children.
ddeae0f1
DM		 1050 * 'type' represents the context type, roughly based on the type of op that
1051 * would do the modifying, although local() is represented by OP_NULL.
1052 * It's responsible for detecting things that can't be modified, flag
1053 * things that need to behave specially in an lvalue context (e.g., "$$x = 5"
1054 * might have to vivify a reference in $x), and so on.
1055 *
1056 * For example, "$a+1 = 2" would cause mod() to be called with o being
1057 * OP_ADD and type being OP_SASSIGN, and would output an error.
1058 */
1059
79072805 1060OP *
864dbfa3 1061Perl_mod(pTHX_ OP *o, I32 type)
79072805 1062{
27da23d5 1063 dVAR;
79072805 1064 OP *kid;
ddeae0f1
DM		 1065 /* -1 = error on localize, 0 = ignore localize, 1 = ok to localize */
1066 int localize = -1;
79072805 1067
3280af22 1068 if (!o || PL_error_count)
11343788 1069 return o;
79072805 1070
b162f9ea 1071 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 1072 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
1073 {
b162f9ea 1074 return o;
7e363e51 1075 }
1c846c1f 1076
11343788 1077 switch (o->op_type) {
68dc0745 1078 case OP_UNDEF:
ddeae0f1 1079 localize = 0;
3280af22 1080 PL_modcount++;
5dc0d613 1081 return o;
a0d0e21e 1082 case OP_CONST:
2e0ae2d3 1083 if (!(o->op_private & OPpCONST_ARYBASE))
a0d0e21e 1084 goto nomod;
54dc0f91 1085 localize = 0;
3280af22 1086 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
fc15ae8f
NC		 1087 CopARYBASE_set(&PL_compiling,
1088 (I32)SvIV(cSVOPx(PL_eval_start)->op_sv));
3280af22 1089 PL_eval_start = 0;
a0d0e21e
LW		 1090 }
1091 else if (!type) {
fc15ae8f
NC		 1092 SAVECOPARYBASE(&PL_compiling);
1093 CopARYBASE_set(&PL_compiling, 0);
a0d0e21e
LW		 1094 }
1095 else if (type == OP_REFGEN)
1096 goto nomod;
1097 else
cea2e8a9 1098 Perl_croak(aTHX_ "That use of $[ is unsupported");
a0d0e21e 1099 break;
5f05dabc 1100 case OP_STUB:
eb8433b7 1101 if (o->op_flags & OPf_PARENS || PL_madskills)
5f05dabc 1102 break;
1103 goto nomod;
a0d0e21e
LW		 1104 case OP_ENTERSUB:
1105 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1106 !(o->op_flags & OPf_STACKED)) {
1107 o->op_type = OP_RV2CV; /* entersub => rv2cv */
e26df76a
NC		 1108 /* The default is to set op_private to the number of children,
1109 which for a UNOP such as RV2CV is always 1. And w're using
1110 the bit for a flag in RV2CV, so we need it clear. */
1111 o->op_private &= ~1;
22c35a8c 1112 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788 1113 assert(cUNOPo->op_first->op_type == OP_NULL);
93c66552 1114 op_null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1115 break;
1116 }
95f0a2f1
SB		 1117 else if (o->op_private & OPpENTERSUB_NOMOD)
1118 return o;
cd06dffe
GS		 1119 else { /* lvalue subroutine call */
1120 o->op_private |= OPpLVAL_INTRO;
e6438c1a 1121 PL_modcount = RETURN_UNLIMITED_NUMBER;
4978d6d9 1122 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN) {
cd06dffe
GS		 1123 /* Backward compatibility mode: */
1124 o->op_private |= OPpENTERSUB_INARGS;
1125 break;
1126 }
1127 else { /* Compile-time error message: */
1128 OP *kid = cUNOPo->op_first;
1129 CV *cv;
1130 OP *okid;
1131
3ea285d1
AL		 1132 if (kid->op_type != OP_PUSHMARK) {
1133 if (kid->op_type != OP_NULL || kid->op_targ != OP_LIST)
1134 Perl_croak(aTHX_
1135 "panic: unexpected lvalue entersub "
1136 "args: type/targ %ld:%"UVuf,
1137 (long)kid->op_type, (UV)kid->op_targ);
1138 kid = kLISTOP->op_first;
1139 }
cd06dffe
GS		 1140 while (kid->op_sibling)
1141 kid = kid->op_sibling;
1142 if (!(kid->op_type == OP_NULL && kid->op_targ == OP_RV2CV)) {
1143 /* Indirect call */
1144 if (kid->op_type == OP_METHOD_NAMED
1145 || kid->op_type == OP_METHOD)
1146 {
87d7fd28 1147 UNOP *newop;
b2ffa427 1148
87d7fd28 1149 NewOp(1101, newop, 1, UNOP);
349fd7b7
GS		 1150 newop->op_type = OP_RV2CV;
1151 newop->op_ppaddr = PL_ppaddr[OP_RV2CV];
5f66b61c 1152 newop->op_first = NULL;
87d7fd28
GS		 1153 newop->op_next = (OP*)newop;
1154 kid->op_sibling = (OP*)newop;
349fd7b7 1155 newop->op_private |= OPpLVAL_INTRO;
e26df76a 1156 newop->op_private &= ~1;
cd06dffe
GS		 1157 break;
1158 }
b2ffa427 1159
cd06dffe
GS		 1160 if (kid->op_type != OP_RV2CV)
1161 Perl_croak(aTHX_
1162 "panic: unexpected lvalue entersub "
55140b79 1163 "entry via type/targ %ld:%"UVuf,
3d811634 1164 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1165 kid->op_private |= OPpLVAL_INTRO;
1166 break; /* Postpone until runtime */
1167 }
b2ffa427
NIS		 1168
1169 okid = kid;
cd06dffe
GS		 1170 kid = kUNOP->op_first;
1171 if (kid->op_type == OP_NULL && kid->op_targ == OP_RV2SV)
1172 kid = kUNOP->op_first;
b2ffa427 1173 if (kid->op_type == OP_NULL)
cd06dffe
GS		 1174 Perl_croak(aTHX_
1175 "Unexpected constant lvalue entersub "
55140b79 1176 "entry via type/targ %ld:%"UVuf,
3d811634 1177 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1178 if (kid->op_type != OP_GV) {
1179 /* Restore RV2CV to check lvalueness */
1180 restore_2cv:
1181 if (kid->op_next && kid->op_next != kid) { /* Happens? */
1182 okid->op_next = kid->op_next;
1183 kid->op_next = okid;
1184 }
1185 else
5f66b61c 1186 okid->op_next = NULL;
cd06dffe
GS		 1187 okid->op_type = OP_RV2CV;
1188 okid->op_targ = 0;
1189 okid->op_ppaddr = PL_ppaddr[OP_RV2CV];
1190 okid->op_private |= OPpLVAL_INTRO;
e26df76a 1191 okid->op_private &= ~1;
cd06dffe
GS		 1192 break;
1193 }
b2ffa427 1194
638eceb6 1195 cv = GvCV(kGVOP_gv);
1c846c1f 1196 if (!cv)
cd06dffe
GS		 1197 goto restore_2cv;
1198 if (CvLVALUE(cv))
1199 break;
1200 }
1201 }
79072805
LW		 1202 /* FALL THROUGH */
1203 default:
a0d0e21e 1204 nomod:
6fbb66d6
NC		 1205 /* grep, foreach, subcalls, refgen */
1206 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
a0d0e21e 1207 break;
cea2e8a9 1208 yyerror(Perl_form(aTHX_ "Can't modify %s in %s",
638bc118 1209 (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
cd06dffe
GS		 1210 ? "do block"
1211 : (o->op_type == OP_ENTERSUB
1212 ? "non-lvalue subroutine call"
53e06cf0 1213 : OP_DESC(o))),
22c35a8c 1214 type ? PL_op_desc[type] : "local"));
11343788 1215 return o;
79072805 1216
a0d0e21e
LW		 1217 case OP_PREINC:
1218 case OP_PREDEC:
1219 case OP_POW:
1220 case OP_MULTIPLY:
1221 case OP_DIVIDE:
1222 case OP_MODULO:
1223 case OP_REPEAT:
1224 case OP_ADD:
1225 case OP_SUBTRACT:
1226 case OP_CONCAT:
1227 case OP_LEFT_SHIFT:
1228 case OP_RIGHT_SHIFT:
1229 case OP_BIT_AND:
1230 case OP_BIT_XOR:
1231 case OP_BIT_OR:
1232 case OP_I_MULTIPLY:
1233 case OP_I_DIVIDE:
1234 case OP_I_MODULO:
1235 case OP_I_ADD:
1236 case OP_I_SUBTRACT:
11343788 1237 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1238 goto nomod;
3280af22 1239 PL_modcount++;
a0d0e21e 1240 break;
b2ffa427 1241
79072805 1242 case OP_COND_EXPR:
ddeae0f1 1243 localize = 1;
11343788 1244 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1245 mod(kid, type);
79072805
LW		 1246 break;
1247
1248 case OP_RV2AV:
1249 case OP_RV2HV:
11343788 1250 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
e6438c1a 1251 PL_modcount = RETURN_UNLIMITED_NUMBER;
11343788 1252 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1253 }
1254 /* FALL THROUGH */
79072805 1255 case OP_RV2GV:
5dc0d613 1256 if (scalar_mod_type(o, type))
3fe9a6f1 1257 goto nomod;
11343788 1258 ref(cUNOPo->op_first, o->op_type);
79072805 1259 /* FALL THROUGH */
79072805
LW		 1260 case OP_ASLICE:
1261 case OP_HSLICE:
78f9721b
SM		 1262 if (type == OP_LEAVESUBLV)
1263 o->op_private |= OPpMAYBE_LVSUB;
ddeae0f1 1264 localize = 1;
78f9721b
SM		 1265 /* FALL THROUGH */
1266 case OP_AASSIGN:
93a17b20
LW		 1267 case OP_NEXTSTATE:
1268 case OP_DBSTATE:
e6438c1a 1269 PL_modcount = RETURN_UNLIMITED_NUMBER;
79072805 1270 break;
463ee0b2 1271 case OP_RV2SV:
aeea060c 1272 ref(cUNOPo->op_first, o->op_type);
ddeae0f1 1273 localize = 1;
463ee0b2 1274 /* FALL THROUGH */
79072805 1275 case OP_GV:
463ee0b2 1276 case OP_AV2ARYLEN:
3280af22 1277 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1278 case OP_SASSIGN:
bf4b1e52
GS		 1279 case OP_ANDASSIGN:
1280 case OP_ORASSIGN:
c963b151 1281 case OP_DORASSIGN:
ddeae0f1
DM		 1282 PL_modcount++;
1283 break;
1284
8990e307 1285 case OP_AELEMFAST:
6a077020 1286 localize = -1;
3280af22 1287 PL_modcount++;
8990e307
LW		 1288 break;
1289
748a9306
LW		 1290 case OP_PADAV:
1291 case OP_PADHV:
e6438c1a 1292 PL_modcount = RETURN_UNLIMITED_NUMBER;
5196be3e
MB		 1293 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1294 return o; /* Treat \(@foo) like ordinary list. */
1295 if (scalar_mod_type(o, type))
3fe9a6f1 1296 goto nomod;
78f9721b
SM		 1297 if (type == OP_LEAVESUBLV)
1298 o->op_private |= OPpMAYBE_LVSUB;
748a9306
LW		 1299 /* FALL THROUGH */
1300 case OP_PADSV:
3280af22 1301 PL_modcount++;
ddeae0f1 1302 if (!type) /* local() */
cea2e8a9 1303 Perl_croak(aTHX_ "Can't localize lexical variable %s",
dd2155a4 1304 PAD_COMPNAME_PV(o->op_targ));
463ee0b2
LW		 1305 break;
1306
748a9306 1307 case OP_PUSHMARK:
ddeae0f1 1308 localize = 0;
748a9306 1309 break;
b2ffa427 1310
69969c6f
SB		 1311 case OP_KEYS:
1312 if (type != OP_SASSIGN)
1313 goto nomod;
5d82c453
GA		 1314 goto lvalue_func;
1315 case OP_SUBSTR:
1316 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1317 goto nomod;
5f05dabc 1318 /* FALL THROUGH */
a0d0e21e 1319 case OP_POS:
463ee0b2 1320 case OP_VEC:
78f9721b
SM		 1321 if (type == OP_LEAVESUBLV)
1322 o->op_private |= OPpMAYBE_LVSUB;
5d82c453 1323 lvalue_func:
11343788
MB		 1324 pad_free(o->op_targ);
1325 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1326 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1327 if (o->op_flags & OPf_KIDS)
1328 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1329 break;
a0d0e21e 1330
463ee0b2
LW		 1331 case OP_AELEM:
1332 case OP_HELEM:
11343788 1333 ref(cBINOPo->op_first, o->op_type);
68dc0745 1334 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1335 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1336 o->op_private |= OPpLVAL_DEFER;
78f9721b
SM		 1337 if (type == OP_LEAVESUBLV)
1338 o->op_private |= OPpMAYBE_LVSUB;
ddeae0f1 1339 localize = 1;
3280af22 1340 PL_modcount++;
463ee0b2
LW		 1341 break;
1342
1343 case OP_SCOPE:
1344 case OP_LEAVE:
1345 case OP_ENTER:
78f9721b 1346 case OP_LINESEQ:
ddeae0f1 1347 localize = 0;
11343788
MB		 1348 if (o->op_flags & OPf_KIDS)
1349 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1350 break;
1351
1352 case OP_NULL:
ddeae0f1 1353 localize = 0;
638bc118
GS		 1354 if (o->op_flags & OPf_SPECIAL) /* do BLOCK */
1355 goto nomod;
1356 else if (!(o->op_flags & OPf_KIDS))
463ee0b2 1357 break;
11343788
MB		 1358 if (o->op_targ != OP_LIST) {
1359 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1360 break;
1361 }
1362 /* FALL THROUGH */
463ee0b2 1363 case OP_LIST:
ddeae0f1 1364 localize = 0;
11343788 1365 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1366 mod(kid, type);
1367 break;
78f9721b
SM		 1368
1369 case OP_RETURN:
1370 if (type != OP_LEAVESUBLV)
1371 goto nomod;
1372 break; /* mod()ing was handled by ck_return() */
463ee0b2 1373 }
58d95175 1374
8be1be90
AMS		 1375 /* [20011101.069] File test operators interpret OPf_REF to mean that
1376 their argument is a filehandle; thus \stat(".") should not set
1377 it. AMS 20011102 */
1378 if (type == OP_REFGEN &&
1379 PL_check[o->op_type] == MEMBER_TO_FPTR(Perl_ck_ftst))
1380 return o;
1381
1382 if (type != OP_LEAVESUBLV)
1383 o->op_flags |= OPf_MOD;
1384
1385 if (type == OP_AASSIGN || type == OP_SASSIGN)
1386 o->op_flags |= OPf_SPECIAL|OPf_REF;
ddeae0f1
DM		 1387 else if (!type) { /* local() */
1388 switch (localize) {
1389 case 1:
1390 o->op_private |= OPpLVAL_INTRO;
1391 o->op_flags &= ~OPf_SPECIAL;
1392 PL_hints |= HINT_BLOCK_SCOPE;
1393 break;
1394 case 0:
1395 break;
1396 case -1:
1397 if (ckWARN(WARN_SYNTAX)) {
1398 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
1399 "Useless localization of %s", OP_DESC(o));
1400 }
1401 }
463ee0b2 1402 }
8be1be90
AMS		 1403 else if (type != OP_GREPSTART && type != OP_ENTERSUB
1404 && type != OP_LEAVESUBLV)
1405 o->op_flags |= OPf_REF;
11343788 1406 return o;
463ee0b2
LW		 1407}
1408
864dbfa3 1409STATIC bool
5f66b61c 1410S_scalar_mod_type(const OP *o, I32 type)
3fe9a6f1 1411{
1412 switch (type) {
1413 case OP_SASSIGN:
5196be3e 1414 if (o->op_type == OP_RV2GV)
3fe9a6f1 1415 return FALSE;
1416 /* FALL THROUGH */
1417 case OP_PREINC:
1418 case OP_PREDEC:
1419 case OP_POSTINC:
1420 case OP_POSTDEC:
1421 case OP_I_PREINC:
1422 case OP_I_PREDEC:
1423 case OP_I_POSTINC:
1424 case OP_I_POSTDEC:
1425 case OP_POW:
1426 case OP_MULTIPLY:
1427 case OP_DIVIDE:
1428 case OP_MODULO:
1429 case OP_REPEAT:
1430 case OP_ADD:
1431 case OP_SUBTRACT:
1432 case OP_I_MULTIPLY:
1433 case OP_I_DIVIDE:
1434 case OP_I_MODULO:
1435 case OP_I_ADD:
1436 case OP_I_SUBTRACT:
1437 case OP_LEFT_SHIFT:
1438 case OP_RIGHT_SHIFT:
1439 case OP_BIT_AND:
1440 case OP_BIT_XOR:
1441 case OP_BIT_OR:
1442 case OP_CONCAT:
1443 case OP_SUBST:
1444 case OP_TRANS:
49e9fbe6
GS		 1445 case OP_READ:
1446 case OP_SYSREAD:
1447 case OP_RECV:
bf4b1e52
GS		 1448 case OP_ANDASSIGN:
1449 case OP_ORASSIGN:
3fe9a6f1 1450 return TRUE;
1451 default:
1452 return FALSE;
1453 }
1454}
1455
35cd451c 1456STATIC bool
5f66b61c 1457S_is_handle_constructor(const OP *o, I32 numargs)
35cd451c
GS		 1458{
1459 switch (o->op_type) {
1460 case OP_PIPE_OP:
1461 case OP_SOCKPAIR:
504618e9 1462 if (numargs == 2)
35cd451c
GS		 1463 return TRUE;
1464 /* FALL THROUGH */
1465 case OP_SYSOPEN:
1466 case OP_OPEN:
ded8aa31 1467 case OP_SELECT: /* XXX c.f. SelectSaver.pm */
35cd451c
GS		 1468 case OP_SOCKET:
1469 case OP_OPEN_DIR:
1470 case OP_ACCEPT:
504618e9 1471 if (numargs == 1)
35cd451c 1472 return TRUE;
5f66b61c 1473 /* FALLTHROUGH */
35cd451c
GS		 1474 default:
1475 return FALSE;
1476 }
1477}
1478
463ee0b2 1479OP *
864dbfa3 1480Perl_refkids(pTHX_ OP *o, I32 type)
463ee0b2 1481{
11343788 1482 if (o && o->op_flags & OPf_KIDS) {
6867be6d 1483 OP *kid;
11343788 1484 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1485 ref(kid, type);
1486 }
11343788 1487 return o;
463ee0b2
LW		 1488}
1489
1490OP *
e4c5ccf3 1491Perl_doref(pTHX_ OP *o, I32 type, bool set_op_ref)
463ee0b2 1492{
27da23d5 1493 dVAR;
463ee0b2 1494 OP *kid;
463ee0b2 1495
3280af22 1496 if (!o || PL_error_count)
11343788 1497 return o;
463ee0b2 1498
11343788 1499 switch (o->op_type) {
a0d0e21e 1500 case OP_ENTERSUB:
afebc493 1501 if ((type == OP_EXISTS || type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1502 !(o->op_flags & OPf_STACKED)) {
1503 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1504 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788 1505 assert(cUNOPo->op_first->op_type == OP_NULL);
93c66552 1506 op_null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
11343788 1507 o->op_flags |= OPf_SPECIAL;
e26df76a 1508 o->op_private &= ~1;
8990e307
LW		 1509 }
1510 break;
aeea060c 1511
463ee0b2 1512 case OP_COND_EXPR:
11343788 1513 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
e4c5ccf3 1514 doref(kid, type, set_op_ref);
463ee0b2 1515 break;
8990e307 1516 case OP_RV2SV:
35cd451c
GS		 1517 if (type == OP_DEFINED)
1518 o->op_flags |= OPf_SPECIAL; /* don't create GV */
e4c5ccf3 1519 doref(cUNOPo->op_first, o->op_type, set_op_ref);
4633a7c4
LW		 1520 /* FALL THROUGH */
1521 case OP_PADSV:
5f05dabc 1522 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1523 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1524 : type == OP_RV2HV ? OPpDEREF_HV
1525 : OPpDEREF_SV);
11343788 1526 o->op_flags |= OPf_MOD;
a0d0e21e 1527 }
8990e307 1528 break;
1c846c1f 1529
2faa37cc 1530 case OP_THREADSV:
a863c7d1
MB		 1531 o->op_flags |= OPf_MOD; /* XXX ??? */
1532 break;
1533
463ee0b2
LW		 1534 case OP_RV2AV:
1535 case OP_RV2HV:
e4c5ccf3
RH		 1536 if (set_op_ref)
1537 o->op_flags |= OPf_REF;
8990e307 1538 /* FALL THROUGH */
463ee0b2 1539 case OP_RV2GV:
35cd451c
GS		 1540 if (type == OP_DEFINED)
1541 o->op_flags |= OPf_SPECIAL; /* don't create GV */
e4c5ccf3 1542 doref(cUNOPo->op_first, o->op_type, set_op_ref);
463ee0b2 1543 break;
8990e307 1544
463ee0b2
LW		 1545 case OP_PADAV:
1546 case OP_PADHV:
e4c5ccf3
RH		 1547 if (set_op_ref)
1548 o->op_flags |= OPf_REF;
79072805 1549 break;
aeea060c 1550
8990e307 1551 case OP_SCALAR:
79072805 1552 case OP_NULL:
11343788 1553 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1554 break;
e4c5ccf3 1555 doref(cBINOPo->op_first, type, set_op_ref);
79072805
LW		 1556 break;
1557 case OP_AELEM:
1558 case OP_HELEM:
e4c5ccf3 1559 doref(cBINOPo->op_first, o->op_type, set_op_ref);
5f05dabc 1560 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1561 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1562 : type == OP_RV2HV ? OPpDEREF_HV
1563 : OPpDEREF_SV);
11343788 1564 o->op_flags |= OPf_MOD;
8990e307 1565 }
79072805
LW		 1566 break;
1567
463ee0b2 1568 case OP_SCOPE:
79072805 1569 case OP_LEAVE:
e4c5ccf3
RH		 1570 set_op_ref = FALSE;
1571 /* FALL THROUGH */
79072805 1572 case OP_ENTER:
8990e307 1573 case OP_LIST:
11343788 1574 if (!(o->op_flags & OPf_KIDS))
79072805 1575 break;
e4c5ccf3 1576 doref(cLISTOPo->op_last, type, set_op_ref);
79072805 1577 break;
a0d0e21e
LW		 1578 default:
1579 break;
79072805 1580 }
11343788 1581 return scalar(o);
8990e307 1582
79072805
LW		 1583}
1584
09bef843
SB		 1585STATIC OP *
1586S_dup_attrlist(pTHX_ OP *o)
1587{
97aff369 1588 dVAR;
0bd48802 1589 OP *rop;
09bef843
SB		 1590
1591 /* An attrlist is either a simple OP_CONST or an OP_LIST with kids,
1592 * where the first kid is OP_PUSHMARK and the remaining ones
1593 * are OP_CONST. We need to push the OP_CONST values.
1594 */
1595 if (o->op_type == OP_CONST)
b37c2d43 1596 rop = newSVOP(OP_CONST, o->op_flags, SvREFCNT_inc_NN(cSVOPo->op_sv));
eb8433b7
NC		 1597#ifdef PERL_MAD
1598 else if (o->op_type == OP_NULL)
1d866c12 1599 rop = NULL;
eb8433b7 1600#endif
09bef843
SB		 1601 else {
1602 assert((o->op_type == OP_LIST) && (o->op_flags & OPf_KIDS));
5f66b61c 1603 rop = NULL;
09bef843
SB		 1604 for (o = cLISTOPo->op_first; o; o=o->op_sibling) {
1605 if (o->op_type == OP_CONST)
1606 rop = append_elem(OP_LIST, rop,
1607 newSVOP(OP_CONST, o->op_flags,
b37c2d43 1608 SvREFCNT_inc_NN(cSVOPo->op_sv)));
09bef843
SB		 1609 }
1610 }
1611 return rop;
1612}
1613
1614STATIC void
95f0a2f1 1615S_apply_attrs(pTHX_ HV *stash, SV *target, OP *attrs, bool for_my)
09bef843 1616{
27da23d5 1617 dVAR;
09bef843
SB		 1618 SV *stashsv;
1619
1620 /* fake up C<use attributes $pkg,$rv,@attrs> */
1621 ENTER; /* need to protect against side-effects of 'use' */
1622 SAVEINT(PL_expect);
5aaec2b4 1623 stashsv = stash ? newSVhek(HvNAME_HEK(stash)) : &PL_sv_no;
e4783991 1624
09bef843 1625#define ATTRSMODULE "attributes"
95f0a2f1
SB		 1626#define ATTRSMODULE_PM "attributes.pm"
1627
1628 if (for_my) {
95f0a2f1 1629 /* Don't force the C<use> if we don't need it. */
a4fc7abc 1630 SV * const * const svp = hv_fetchs(GvHVn(PL_incgv), ATTRSMODULE_PM, FALSE);
95f0a2f1 1631 if (svp && *svp != &PL_sv_undef)
6f207bd3 1632 NOOP; /* already in %INC */
95f0a2f1
SB		 1633 else
1634 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
6136c704 1635 newSVpvs(ATTRSMODULE), NULL);
95f0a2f1
SB		 1636 }
1637 else {
1638 Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS,
6136c704
AL		 1639 newSVpvs(ATTRSMODULE),
1640 NULL,
95f0a2f1
SB		 1641 prepend_elem(OP_LIST,
1642 newSVOP(OP_CONST, 0, stashsv),
1643 prepend_elem(OP_LIST,
1644 newSVOP(OP_CONST, 0,
1645 newRV(target)),
1646 dup_attrlist(attrs))));
1647 }
09bef843
SB		 1648 LEAVE;
1649}
1650
95f0a2f1
SB		 1651STATIC void
1652S_apply_attrs_my(pTHX_ HV *stash, OP *target, OP *attrs, OP **imopsp)
1653{
97aff369 1654 dVAR;
95f0a2f1
SB		 1655 OP *pack, *imop, *arg;
1656 SV *meth, *stashsv;
1657
1658 if (!attrs)
1659 return;
1660
1661 assert(target->op_type == OP_PADSV ||
1662 target->op_type == OP_PADHV ||
1663 target->op_type == OP_PADAV);
1664
1665 /* Ensure that attributes.pm is loaded. */
dd2155a4 1666 apply_attrs(stash, PAD_SV(target->op_targ), attrs, TRUE);
95f0a2f1
SB		 1667
1668 /* Need package name for method call. */
6136c704 1669 pack = newSVOP(OP_CONST, 0, newSVpvs(ATTRSMODULE));
95f0a2f1
SB		 1670
1671 /* Build up the real arg-list. */
5aaec2b4
NC		 1672 stashsv = stash ? newSVhek(HvNAME_HEK(stash)) : &PL_sv_no;
1673
95f0a2f1
SB		 1674 arg = newOP(OP_PADSV, 0);
1675 arg->op_targ = target->op_targ;
1676 arg = prepend_elem(OP_LIST,
1677 newSVOP(OP_CONST, 0, stashsv),
1678 prepend_elem(OP_LIST,
1679 newUNOP(OP_REFGEN, 0,
1680 mod(arg, OP_REFGEN)),
1681 dup_attrlist(attrs)));
1682
1683 /* Fake up a method call to import */
18916d0d 1684 meth = newSVpvs_share("import");
95f0a2f1
SB		 1685 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL|OPf_WANT_VOID,
1686 append_elem(OP_LIST,
1687 prepend_elem(OP_LIST, pack, list(arg)),
1688 newSVOP(OP_METHOD_NAMED, 0, meth)));
1689 imop->op_private |= OPpENTERSUB_NOMOD;
1690
1691 /* Combine the ops. */
1692 *imopsp = append_elem(OP_LIST, *imopsp, imop);
1693}
1694
1695/*
1696=notfor apidoc apply_attrs_string
1697
1698Attempts to apply a list of attributes specified by the C<attrstr> and
1699C<len> arguments to the subroutine identified by the C<cv> argument which
1700is expected to be associated with the package identified by the C<stashpv>
1701argument (see L<attributes>). It gets this wrong, though, in that it
1702does not correctly identify the boundaries of the individual attribute
1703specifications within C<attrstr>. This is not really intended for the
1704public API, but has to be listed here for systems such as AIX which
1705need an explicit export list for symbols. (It's called from XS code
1706in support of the C<ATTRS:> keyword from F<xsubpp>.) Patches to fix it
1707to respect attribute syntax properly would be welcome.
1708
1709=cut
1710*/
1711
be3174d2 1712void
6867be6d
AL		 1713Perl_apply_attrs_string(pTHX_ const char *stashpv, CV *cv,
1714 const char *attrstr, STRLEN len)
be3174d2 1715{
5f66b61c 1716 OP *attrs = NULL;
be3174d2
GS		 1717
1718 if (!len) {
1719 len = strlen(attrstr);
1720 }
1721
1722 while (len) {
1723 for (; isSPACE(*attrstr) && len; --len, ++attrstr) ;
1724 if (len) {
890ce7af 1725 const char * const sstr = attrstr;
be3174d2
GS		 1726 for (; !isSPACE(*attrstr) && len; --len, ++attrstr) ;
1727 attrs = append_elem(OP_LIST, attrs,
1728 newSVOP(OP_CONST, 0,
1729 newSVpvn(sstr, attrstr-sstr)));
1730 }
1731 }
1732
1733 Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS,
6136c704 1734 newSVpvs(ATTRSMODULE),
a0714e2c 1735 NULL, prepend_elem(OP_LIST,
be3174d2
GS		 1736 newSVOP(OP_CONST, 0, newSVpv(stashpv,0)),
1737 prepend_elem(OP_LIST,
1738 newSVOP(OP_CONST, 0,
1739 newRV((SV*)cv)),
1740 attrs)));
1741}
1742
09bef843 1743STATIC OP *
95f0a2f1 1744S_my_kid(pTHX_ OP *o, OP *attrs, OP **imopsp)
93a17b20 1745{
97aff369 1746 dVAR;
93a17b20
LW		 1747 I32 type;
1748
3280af22 1749 if (!o || PL_error_count)
11343788 1750 return o;
93a17b20 1751
bc61e325 1752 type = o->op_type;
eb8433b7
NC		 1753 if (PL_madskills && type == OP_NULL && o->op_flags & OPf_KIDS) {
1754 (void)my_kid(cUNOPo->op_first, attrs, imopsp);
1755 return o;
1756 }
1757
93a17b20 1758 if (type == OP_LIST) {
6867be6d 1759 OP *kid;
11343788 1760 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
95f0a2f1 1761 my_kid(kid, attrs, imopsp);
eb8433b7
NC		 1762 } else if (type == OP_UNDEF
1763#ifdef PERL_MAD
1764 || type == OP_STUB
1765#endif
1766 ) {
7766148a 1767 return o;
77ca0c92
LW		 1768 } else if (type == OP_RV2SV || /* "our" declaration */
1769 type == OP_RV2AV ||
1770 type == OP_RV2HV) { /* XXX does this let anything illegal in? */
1ce0b88c
RGS		 1771 if (cUNOPo->op_first->op_type != OP_GV) { /* MJD 20011224 */
1772 yyerror(Perl_form(aTHX_ "Can't declare %s in %s",
952306ac
RGS		 1773 OP_DESC(o),
1774 PL_in_my == KEY_our ? "our" : PL_in_my == KEY_state ? "state" : "my"));
1ce0b88c 1775 } else if (attrs) {
551405c4 1776 GV * const gv = cGVOPx_gv(cUNOPo->op_first);
1ce0b88c 1777 PL_in_my = FALSE;
5c284bb0 1778 PL_in_my_stash = NULL;
1ce0b88c
RGS		 1779 apply_attrs(GvSTASH(gv),
1780 (type == OP_RV2SV ? GvSV(gv) :
1781 type == OP_RV2AV ? (SV*)GvAV(gv) :
1782 type == OP_RV2HV ? (SV*)GvHV(gv) : (SV*)gv),
1783 attrs, FALSE);
1784 }
192587c2 1785 o->op_private |= OPpOUR_INTRO;
77ca0c92 1786 return o;
95f0a2f1
SB		 1787 }
1788 else if (type != OP_PADSV &&
93a17b20
LW		 1789 type != OP_PADAV &&
1790 type != OP_PADHV &&
1791 type != OP_PUSHMARK)
1792 {
eb64745e 1793 yyerror(Perl_form(aTHX_ "Can't declare %s in \"%s\"",
53e06cf0 1794 OP_DESC(o),
952306ac 1795 PL_in_my == KEY_our ? "our" : PL_in_my == KEY_state ? "state" : "my"));
11343788 1796 return o;
93a17b20 1797 }
09bef843
SB		 1798 else if (attrs && type != OP_PUSHMARK) {
1799 HV *stash;
09bef843 1800
eb64745e 1801 PL_in_my = FALSE;
5c284bb0 1802 PL_in_my_stash = NULL;
eb64745e 1803
09bef843 1804 /* check for C<my Dog $spot> when deciding package */
dd2155a4
DM		 1805 stash = PAD_COMPNAME_TYPE(o->op_targ);
1806 if (!stash)
09bef843 1807 stash = PL_curstash;
95f0a2f1 1808 apply_attrs_my(stash, o, attrs, imopsp);
09bef843 1809 }
11343788
MB		 1810 o->op_flags |= OPf_MOD;
1811 o->op_private |= OPpLVAL_INTRO;
952306ac
RGS		 1812 if (PL_in_my == KEY_state)
1813 o->op_private |= OPpPAD_STATE;
11343788 1814 return o;
93a17b20
LW		 1815}
1816
1817OP *
09bef843
SB		 1818Perl_my_attrs(pTHX_ OP *o, OP *attrs)
1819{
97aff369 1820 dVAR;
0bd48802 1821 OP *rops;
95f0a2f1
SB		 1822 int maybe_scalar = 0;
1823
d2be0de5 1824/* [perl #17376]: this appears to be premature, and results in code such as
c754c3d7 1825 C< our(%x); > executing in list mode rather than void mode */
d2be0de5 1826#if 0
09bef843
SB		 1827 if (o->op_flags & OPf_PARENS)
1828 list(o);
95f0a2f1
SB		 1829 else
1830 maybe_scalar = 1;
d2be0de5
YST		 1831#else
1832 maybe_scalar = 1;
1833#endif
09bef843
SB		 1834 if (attrs)
1835 SAVEFREEOP(attrs);
5f66b61c 1836 rops = NULL;
95f0a2f1
SB		 1837 o = my_kid(o, attrs, &rops);
1838 if (rops) {
1839 if (maybe_scalar && o->op_type == OP_PADSV) {
1840 o = scalar(append_list(OP_LIST, (LISTOP*)rops, (LISTOP*)o));
1841 o->op_private |= OPpLVAL_INTRO;
1842 }
1843 else
1844 o = append_list(OP_LIST, (LISTOP*)o, (LISTOP*)rops);
1845 }
eb64745e 1846 PL_in_my = FALSE;
5c284bb0 1847 PL_in_my_stash = NULL;
eb64745e 1848 return o;
09bef843
SB		 1849}
1850
1851OP *
1852Perl_my(pTHX_ OP *o)
1853{
5f66b61c 1854 return my_attrs(o, NULL);
09bef843
SB		 1855}
1856
1857OP *
864dbfa3 1858Perl_sawparens(pTHX_ OP *o)
79072805 1859{
96a5add6 1860 PERL_UNUSED_CONTEXT;
79072805
LW		 1861 if (o)
1862 o->op_flags |= OPf_PARENS;
1863 return o;
1864}
1865
1866OP *
864dbfa3 1867Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
79072805 1868{
11343788 1869 OP *o;
59f00321 1870 bool ismatchop = 0;
1496a290
AL		 1871 const OPCODE ltype = left->op_type;
1872 const OPCODE rtype = right->op_type;
79072805 1873
1496a290
AL		 1874 if ( (ltype == OP_RV2AV || ltype == OP_RV2HV || ltype == OP_PADAV
1875 || ltype == OP_PADHV) && ckWARN(WARN_MISC))
041457d9 1876 {
1496a290
AL		 1877 const char * const desc
1878 = PL_op_desc[(rtype == OP_SUBST || rtype == OP_TRANS)
1879 ? rtype : OP_MATCH];
1880 const char * const sample = ((ltype == OP_RV2AV || ltype == OP_PADAV)
1881 ? "@array" : "%hash");
9014280d 1882 Perl_warner(aTHX_ packWARN(WARN_MISC),
1c846c1f 1883 "Applying %s to %s will act on scalar(%s)",
599cee73 1884 desc, sample, sample);
2ae324a7 1885 }
1886
1496a290 1887 if (rtype == OP_CONST &&
5cc9e5c9
RH		 1888 cSVOPx(right)->op_private & OPpCONST_BARE &&
1889 cSVOPx(right)->op_private & OPpCONST_STRICT)
1890 {
1891 no_bareword_allowed(right);
1892 }
1893
1496a290
AL		 1894 ismatchop = rtype == OP_MATCH ||
1895 rtype == OP_SUBST ||
1896 rtype == OP_TRANS;
59f00321
RGS		 1897 if (ismatchop && right->op_private & OPpTARGET_MY) {
1898 right->op_targ = 0;
1899 right->op_private &= ~OPpTARGET_MY;
1900 }
1901 if (!(right->op_flags & OPf_STACKED) && ismatchop) {
1496a290
AL		 1902 OP *newleft;
1903
79072805 1904 right->op_flags |= OPf_STACKED;
1496a290
AL		 1905 if (rtype != OP_MATCH &&
1906 ! (rtype == OP_TRANS &&
6fbb66d6 1907 right->op_private & OPpTRANS_IDENTICAL))
1496a290
AL		 1908 newleft = mod(left, rtype);
1909 else
1910 newleft = left;
79072805 1911 if (right->op_type == OP_TRANS)
1496a290 1912 o = newBINOP(OP_NULL, OPf_STACKED, scalar(newleft), right);
79072805 1913 else
1496a290 1914 o = prepend_elem(rtype, scalar(newleft), right);
79072805 1915 if (type == OP_NOT)
11343788
MB		 1916 return newUNOP(OP_NOT, 0, scalar(o));
1917 return o;
79072805
LW		 1918 }
1919 else
1920 return bind_match(type, left,
131b3ad0 1921 pmruntime(newPMOP(OP_MATCH, 0), right, 0));
79072805
LW		 1922}
1923
1924OP *
864dbfa3 1925Perl_invert(pTHX_ OP *o)
79072805 1926{
11343788 1927 if (!o)
1d866c12 1928 return NULL;
11343788 1929 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1930}
1931
1932OP *
864dbfa3 1933Perl_scope(pTHX_ OP *o)
79072805 1934{
27da23d5 1935 dVAR;
79072805 1936 if (o) {
3280af22 1937 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1938 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1939 o->op_type = OP_LEAVE;
22c35a8c 1940 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2 1941 }
fdb22418
HS		 1942 else if (o->op_type == OP_LINESEQ) {
1943 OP *kid;
1944 o->op_type = OP_SCOPE;
1945 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
1946 kid = ((LISTOP*)o)->op_first;
59110972 1947 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) {
fdb22418 1948 op_null(kid);
59110972
RH		 1949
1950 /* The following deals with things like 'do {1 for 1}' */
1951 kid = kid->op_sibling;
1952 if (kid &&
1953 (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE))
1954 op_null(kid);
1955 }
463ee0b2 1956 }
fdb22418 1957 else
5f66b61c 1958 o = newLISTOP(OP_SCOPE, 0, o, NULL);
79072805
LW		 1959 }
1960 return o;
1961}
72dc9ed5 1962
a0d0e21e 1963int
864dbfa3 1964Perl_block_start(pTHX_ int full)
79072805 1965{
97aff369 1966 dVAR;
73d840c0 1967 const int retval = PL_savestack_ix;
dd2155a4 1968 pad_block_start(full);
b3ac6de7 1969 SAVEHINTS();
3280af22 1970 PL_hints &= ~HINT_BLOCK_SCOPE;
68da3b2f 1971 SAVECOMPILEWARNINGS();
72dc9ed5 1972 PL_compiling.cop_warnings = DUP_WARNINGS(PL_compiling.cop_warnings);
a0d0e21e
LW		 1973 return retval;
1974}
1975
1976OP*
864dbfa3 1977Perl_block_end(pTHX_ I32 floor, OP *seq)
a0d0e21e 1978{
97aff369 1979 dVAR;
6867be6d 1980 const int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
551405c4 1981 OP* const retval = scalarseq(seq);
e9818f4e 1982 LEAVE_SCOPE(floor);
623e6609 1983 CopHINTS_set(&PL_compiling, PL_hints);
a0d0e21e 1984 if (needblockscope)
3280af22 1985 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
dd2155a4 1986 pad_leavemy();
a0d0e21e
LW		 1987 return retval;
1988}
1989
76e3520e 1990STATIC OP *
cea2e8a9 1991S_newDEFSVOP(pTHX)
54b9620d 1992{
97aff369 1993 dVAR;
9f7d9405 1994 const PADOFFSET offset = pad_findmy("$_");
00b1698f 1995 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS_isOUR(offset)) {
59f00321
RGS		 1996 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
1997 }
1998 else {
551405c4 1999 OP * const o = newOP(OP_PADSV, 0);
59f00321
RGS		 2000 o->op_targ = offset;
2001 return o;
2002 }
54b9620d
MB		 2003}
2004
a0d0e21e 2005void
864dbfa3 2006Perl_newPROG(pTHX_ OP *o)
a0d0e21e 2007{
97aff369 2008 dVAR;
3280af22 2009 if (PL_in_eval) {
b295d113
TH		 2010 if (PL_eval_root)
2011 return;
faef0170
HS		 2012 PL_eval_root = newUNOP(OP_LEAVEEVAL,
2013 ((PL_in_eval & EVAL_KEEPERR)
2014 ? OPf_SPECIAL : 0), o);
3280af22 2015 PL_eval_start = linklist(PL_eval_root);
7934575e
GS		 2016 PL_eval_root->op_private |= OPpREFCOUNTED;
2017 OpREFCNT_set(PL_eval_root, 1);
3280af22 2018 PL_eval_root->op_next = 0;
a2efc822 2019 CALL_PEEP(PL_eval_start);
a0d0e21e
LW		 2020 }
2021 else {
6be89cf9
AE		 2022 if (o->op_type == OP_STUB) {
2023 PL_comppad_name = 0;
2024 PL_compcv = 0;
2a4f803a 2025 FreeOp(o);
a0d0e21e 2026 return;
6be89cf9 2027 }
3280af22
NIS		 2028 PL_main_root = scope(sawparens(scalarvoid(o)));
2029 PL_curcop = &PL_compiling;
2030 PL_main_start = LINKLIST(PL_main_root);
7934575e
GS		 2031 PL_main_root->op_private |= OPpREFCOUNTED;
2032 OpREFCNT_set(PL_main_root, 1);
3280af22 2033 PL_main_root->op_next = 0;
a2efc822 2034 CALL_PEEP(PL_main_start);
3280af22 2035 PL_compcv = 0;
3841441e 2036
4fdae800 2037 /* Register with debugger */
84902520 2038 if (PERLDB_INTER) {
551405c4 2039 CV * const cv = get_cv("DB::postponed", FALSE);
3841441e
CS		 2040 if (cv) {
2041 dSP;
924508f0 2042 PUSHMARK(SP);
cc49e20b 2043 XPUSHs((SV*)CopFILEGV(&PL_compiling));
3841441e 2044 PUTBACK;
864dbfa3 2045 call_sv((SV*)cv, G_DISCARD);
3841441e
CS		 2046 }
2047 }
79072805 2048 }
79072805
LW		 2049}
2050
2051OP *
864dbfa3 2052Perl_localize(pTHX_ OP *o, I32 lex)
79072805 2053{
97aff369 2054 dVAR;
79072805 2055 if (o->op_flags & OPf_PARENS)
d2be0de5
YST		 2056/* [perl #17376]: this appears to be premature, and results in code such as
2057 C< our(%x); > executing in list mode rather than void mode */
2058#if 0
79072805 2059 list(o);
d2be0de5 2060#else
6f207bd3 2061 NOOP;
d2be0de5 2062#endif
8990e307 2063 else {
041457d9
DM		 2064 if ( PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ','
2065 && ckWARN(WARN_PARENTHESIS))
64420d0d
JH		 2066 {
2067 char *s = PL_bufptr;
bac662ee 2068 bool sigil = FALSE;
64420d0d 2069
8473848f 2070 /* some heuristics to detect a potential error */
bac662ee 2071 while (*s && (strchr(", \t\n", *s)))
64420d0d 2072 s++;
8473848f 2073
bac662ee
TS		 2074 while (1) {
2075 if (*s && strchr("@$%*", *s) && *++s
2076 && (isALNUM(*s) || UTF8_IS_CONTINUED(*s))) {
2077 s++;
2078 sigil = TRUE;
2079 while (*s && (isALNUM(*s) || UTF8_IS_CONTINUED(*s)))
2080 s++;
2081 while (*s && (strchr(", \t\n", *s)))
2082 s++;
2083 }
2084 else
2085 break;
2086 }
2087 if (sigil && (*s == ';' || *s == '=')) {
2088 Perl_warner(aTHX_ packWARN(WARN_PARENTHESIS),
8473848f 2089 "Parentheses missing around \"%s\" list",
952306ac 2090 lex ? (PL_in_my == KEY_our ? "our" : PL_in_my == KEY_state ? "state" : "my")
8473848f
RGS		 2091 : "local");
2092 }
8990e307
LW		 2093 }
2094 }
93a17b20 2095 if (lex)
eb64745e 2096 o = my(o);
93a17b20 2097 else
eb64745e
GS		 2098 o = mod(o, OP_NULL); /* a bit kludgey */
2099 PL_in_my = FALSE;
5c284bb0 2100 PL_in_my_stash = NULL;
eb64745e 2101 return o;
79072805
LW		 2102}
2103
2104OP *
864dbfa3 2105Perl_jmaybe(pTHX_ OP *o)
79072805
LW		 2106{
2107 if (o->op_type == OP_LIST) {
fafc274c 2108 OP * const o2
d4c19fe8 2109 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpvs(";", GV_ADD|GV_NOTQUAL, SVt_PV)));
554b3eca 2110 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 2111 }
2112 return o;
2113}
2114
2115OP *
864dbfa3 2116Perl_fold_constants(pTHX_ register OP *o)
79072805 2117{
27da23d5 2118 dVAR;
79072805 2119 register OP *curop;
eb8433b7 2120 OP *newop;
79072805 2121 I32 type = o->op_type;
de5e01c2 2122 SV *sv = NULL;
b7f7fd0b
NC		 2123 int ret = 0;
2124 I32 oldscope;
2125 OP *old_next;
5f2d9966
DM		 2126 SV * const oldwarnhook = PL_warnhook;
2127 SV * const olddiehook = PL_diehook;
b7f7fd0b 2128 dJMPENV;
79072805 2129
22c35a8c 2130 if (PL_opargs[type] & OA_RETSCALAR)
79072805 2131 scalar(o);
b162f9ea 2132 if (PL_opargs[type] & OA_TARGET && !o->op_targ)
ed6116ce 2133 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 2134
eac055e9
GS		 2135 /* integerize op, unless it happens to be C<-foo>.
2136 * XXX should pp_i_negate() do magic string negation instead? */
2137 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)
2138 && !(type == OP_NEGATE && cUNOPo->op_first->op_type == OP_CONST
2139 && (cUNOPo->op_first->op_private & OPpCONST_BARE)))
2140 {
22c35a8c 2141 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
eac055e9 2142 }
85e6fe83 2143
22c35a8c 2144 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 2145 goto nope;
2146
de939608 2147 switch (type) {
7a52d87a
GS		 2148 case OP_NEGATE:
2149 /* XXX might want a ck_negate() for this */
2150 cUNOPo->op_first->op_private &= ~OPpCONST_STRICT;
2151 break;
de939608
CS		 2152 case OP_UCFIRST:
2153 case OP_LCFIRST:
2154 case OP_UC:
2155 case OP_LC:
69dcf70c
MB		 2156 case OP_SLT:
2157 case OP_SGT:
2158 case OP_SLE:
2159 case OP_SGE:
2160 case OP_SCMP:
2de3dbcc
JH		 2161 /* XXX what about the numeric ops? */
2162 if (PL_hints & HINT_LOCALE)
de939608
CS		 2163 goto nope;
2164 }
2165
3280af22 2166 if (PL_error_count)
a0d0e21e
LW		 2167 goto nope; /* Don't try to run w/ errors */
2168
79072805 2169 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
1496a290
AL		 2170 const OPCODE type = curop->op_type;
2171 if ((type != OP_CONST || (curop->op_private & OPpCONST_BARE)) &&
2172 type != OP_LIST &&
2173 type != OP_SCALAR &&
2174 type != OP_NULL &&
2175 type != OP_PUSHMARK)
7a52d87a 2176 {
79072805
LW		 2177 goto nope;
2178 }
2179 }
2180
2181 curop = LINKLIST(o);
b7f7fd0b 2182 old_next = o->op_next;
79072805 2183 o->op_next = 0;
533c011a 2184 PL_op = curop;
b7f7fd0b
NC		 2185
2186 oldscope = PL_scopestack_ix;
edb2152a 2187 create_eval_scope(G_FAKINGEVAL);
b7f7fd0b 2188
5f2d9966
DM		 2189 PL_warnhook = PERL_WARNHOOK_FATAL;
2190 PL_diehook = NULL;
b7f7fd0b
NC		 2191 JMPENV_PUSH(ret);
2192
2193 switch (ret) {
2194 case 0:
2195 CALLRUNOPS(aTHX);
2196 sv = *(PL_stack_sp--);
2197 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
2198 pad_swipe(o->op_targ, FALSE);
2199 else if (SvTEMP(sv)) { /* grab mortal temp? */
2200 SvREFCNT_inc_simple_void(sv);
2201 SvTEMP_off(sv);
2202 }
2203 break;
2204 case 3:
2205 /* Something tried to die. Abandon constant folding. */
2206 /* Pretend the error never happened. */
2207 sv_setpvn(ERRSV,"",0);
2208 o->op_next = old_next;
2209 break;
2210 default:
2211 JMPENV_POP;
5f2d9966
DM		 2212 /* Don't expect 1 (setjmp failed) or 2 (something called my_exit) */
2213 PL_warnhook = oldwarnhook;
2214 PL_diehook = olddiehook;
2215 /* XXX note that this croak may fail as we've already blown away
2216 * the stack - eg any nested evals */
b7f7fd0b
NC		 2217 Perl_croak(aTHX_ "panic: fold_constants JMPENV_PUSH returned %d", ret);
2218 }
b7f7fd0b 2219 JMPENV_POP;
5f2d9966
DM		 2220 PL_warnhook = oldwarnhook;
2221 PL_diehook = olddiehook;
edb2152a
NC		 2222
2223 if (PL_scopestack_ix > oldscope)
2224 delete_eval_scope();
eb8433b7 2225
b7f7fd0b
NC		 2226 if (ret)
2227 goto nope;
2228
eb8433b7 2229#ifndef PERL_MAD
79072805 2230 op_free(o);
eb8433b7 2231#endif
de5e01c2 2232 assert(sv);
79072805 2233 if (type == OP_RV2GV)
eb8433b7
NC		 2234 newop = newGVOP(OP_GV, 0, (GV*)sv);
2235 else
2236 newop = newSVOP(OP_CONST, 0, sv);
2237 op_getmad(o,newop,'f');
2238 return newop;
aeea060c 2239
b7f7fd0b 2240 nope:
79072805
LW		 2241 return o;
2242}
2243
2244OP *
864dbfa3 2245Perl_gen_constant_list(pTHX_ register OP *o)
79072805 2246{
27da23d5 2247 dVAR;
79072805 2248 register OP *curop;
6867be6d 2249 const I32 oldtmps_floor = PL_tmps_floor;
79072805 2250
a0d0e21e 2251 list(o);
3280af22 2252 if (PL_error_count)
a0d0e21e
LW		 2253 return o; /* Don't attempt to run with errors */
2254
533c011a 2255 PL_op = curop = LINKLIST(o);
a0d0e21e 2256 o->op_next = 0;
a2efc822 2257 CALL_PEEP(curop);
cea2e8a9
GS		 2258 pp_pushmark();
2259 CALLRUNOPS(aTHX);
533c011a 2260 PL_op = curop;
cea2e8a9 2261 pp_anonlist();
3280af22 2262 PL_tmps_floor = oldtmps_floor;
79072805
LW		 2263
2264 o->op_type = OP_RV2AV;
22c35a8c 2265 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
fb53bbb2
SG		 2266 o->op_flags &= ~OPf_REF; /* treat \(1..2) like an ordinary list */
2267 o->op_flags |= OPf_PARENS; /* and flatten \(1..2,3) */
2814eb74 2268 o->op_opt = 0; /* needs to be revisited in peep() */
79072805 2269 curop = ((UNOP*)o)->op_first;
b37c2d43 2270 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc_NN(*PL_stack_sp--));
eb8433b7
NC		 2271#ifdef PERL_MAD
2272 op_getmad(curop,o,'O');
2273#else
79072805 2274 op_free(curop);
eb8433b7 2275#endif
79072805
LW		 2276 linklist(o);
2277 return list(o);
2278}
2279
2280OP *
864dbfa3 2281Perl_convert(pTHX_ I32 type, I32 flags, OP *o)
79072805 2282{
27da23d5 2283 dVAR;
11343788 2284 if (!o || o->op_type != OP_LIST)
5f66b61c 2285 o = newLISTOP(OP_LIST, 0, o, NULL);
748a9306 2286 else
5dc0d613 2287 o->op_flags &= ~OPf_WANT;
79072805 2288
22c35a8c 2289 if (!(PL_opargs[type] & OA_MARK))
93c66552 2290 op_null(cLISTOPo->op_first);
8990e307 2291
eb160463 2292 o->op_type = (OPCODE)type;
22c35a8c 2293 o->op_ppaddr = PL_ppaddr[type];
11343788 2294 o->op_flags |= flags;
79072805 2295
11343788 2296 o = CHECKOP(type, o);
fe2774ed 2297 if (o->op_type != (unsigned)type)
11343788 2298 return o;
79072805 2299
11343788 2300 return fold_constants(o);
79072805
LW		 2301}
2302
2303/* List constructors */
2304
2305OP *
864dbfa3 2306Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2307{
2308 if (!first)
2309 return last;
8990e307
LW		 2310
2311 if (!last)
79072805 2312 return first;
8990e307 2313
fe2774ed 2314 if (first->op_type != (unsigned)type
155aba94
GS		 2315 || (type == OP_LIST && (first->op_flags & OPf_PARENS)))
2316 {
2317 return newLISTOP(type, 0, first, last);
2318 }
79072805 2319
a0d0e21e
LW		 2320 if (first->op_flags & OPf_KIDS)
2321 ((LISTOP*)first)->op_last->op_sibling = last;
2322 else {
2323 first->op_flags |= OPf_KIDS;
2324 ((LISTOP*)first)->op_first = last;
2325 }
2326 ((LISTOP*)first)->op_last = last;
a0d0e21e 2327 return first;
79072805
LW		 2328}
2329
2330OP *
864dbfa3 2331Perl_append_list(pTHX_ I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2332{
2333 if (!first)
2334 return (OP*)last;
8990e307
LW		 2335
2336 if (!last)
79072805 2337 return (OP*)first;
8990e307 2338
fe2774ed 2339 if (first->op_type != (unsigned)type)
79072805 2340 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307 2341
fe2774ed 2342 if (last->op_type != (unsigned)type)
79072805
LW		 2343 return append_elem(type, (OP*)first, (OP*)last);
2344
2345 first->op_last->op_sibling = last->op_first;
2346 first->op_last = last->op_last;
117dada2 2347 first->op_flags |= (last->op_flags & OPf_KIDS);
1c846c1f 2348
eb8433b7
NC		 2349#ifdef PERL_MAD
2350 if (last->op_first && first->op_madprop) {
2351 MADPROP *mp = last->op_first->op_madprop;
2352 if (mp) {
2353 while (mp->mad_next)
2354 mp = mp->mad_next;
2355 mp->mad_next = first->op_madprop;
2356 }
2357 else {
2358 last->op_first->op_madprop = first->op_madprop;
2359 }
2360 }
2361 first->op_madprop = last->op_madprop;
2362 last->op_madprop = 0;
2363#endif
2364
238a4c30
NIS		 2365 FreeOp(last);
2366
79072805
LW		 2367 return (OP*)first;
2368}
2369
2370OP *
864dbfa3 2371Perl_prepend_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2372{
2373 if (!first)
2374 return last;
8990e307
LW		 2375
2376 if (!last)
79072805 2377 return first;
8990e307 2378
fe2774ed 2379 if (last->op_type == (unsigned)type) {
8990e307
LW		 2380 if (type == OP_LIST) { /* already a PUSHMARK there */
2381 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2382 ((LISTOP*)last)->op_first->op_sibling = first;
36a5d4ba
DC		 2383 if (!(first->op_flags & OPf_PARENS))
2384 last->op_flags &= ~OPf_PARENS;
8990e307
LW		 2385 }
2386 else {
2387 if (!(last->op_flags & OPf_KIDS)) {
2388 ((LISTOP*)last)->op_last = first;
2389 last->op_flags |= OPf_KIDS;
2390 }
2391 first->op_sibling = ((LISTOP*)last)->op_first;
2392 ((LISTOP*)last)->op_first = first;
79072805 2393 }
117dada2 2394 last->op_flags |= OPf_KIDS;
79072805
LW		 2395 return last;
2396 }
2397
2398 return newLISTOP(type, 0, first, last);
2399}
2400
2401/* Constructors */
2402
eb8433b7
NC		 2403#ifdef PERL_MAD
2404
2405TOKEN *
2406Perl_newTOKEN(pTHX_ I32 optype, YYSTYPE lval, MADPROP* madprop)
2407{
2408 TOKEN *tk;
99129197 2409 Newxz(tk, 1, TOKEN);
eb8433b7
NC		 2410 tk->tk_type = (OPCODE)optype;
2411 tk->tk_type = 12345;
2412 tk->tk_lval = lval;
2413 tk->tk_mad = madprop;
2414 return tk;
2415}
2416
2417void
2418Perl_token_free(pTHX_ TOKEN* tk)
2419{
2420 if (tk->tk_type != 12345)
2421 return;
2422 mad_free(tk->tk_mad);
2423 Safefree(tk);
2424}
2425
2426void
2427Perl_token_getmad(pTHX_ TOKEN* tk, OP* o, char slot)
2428{
2429 MADPROP* mp;
2430 MADPROP* tm;
2431 if (tk->tk_type != 12345) {
2432 Perl_warner(aTHX_ packWARN(WARN_MISC),
2433 "Invalid TOKEN object ignored");
2434 return;
2435 }
2436 tm = tk->tk_mad;
2437 if (!tm)
2438 return;
2439
2440 /* faked up qw list? */
2441 if (slot == '(' &&
2442 tm->mad_type == MAD_SV &&
2443 SvPVX((SV*)tm->mad_val)[0] == 'q')
2444 slot = 'x';
2445
2446 if (o) {
2447 mp = o->op_madprop;
2448 if (mp) {
2449 for (;;) {
2450 /* pretend constant fold didn't happen? */
2451 if (mp->mad_key == 'f' &&
2452 (o->op_type == OP_CONST ||
2453 o->op_type == OP_GV) )
2454 {
2455 token_getmad(tk,(OP*)mp->mad_val,slot);
2456 return;
2457 }
2458 if (!mp->mad_next)
2459 break;
2460 mp = mp->mad_next;
2461 }
2462 mp->mad_next = tm;
2463 mp = mp->mad_next;
2464 }
2465 else {
2466 o->op_madprop = tm;
2467 mp = o->op_madprop;
2468 }
2469 if (mp->mad_key == 'X')
2470 mp->mad_key = slot; /* just change the first one */
2471
2472 tk->tk_mad = 0;
2473 }
2474 else
2475 mad_free(tm);
2476 Safefree(tk);
2477}
2478
2479void
2480Perl_op_getmad_weak(pTHX_ OP* from, OP* o, char slot)
2481{
2482 MADPROP* mp;
2483 if (!from)
2484 return;
2485 if (o) {
2486 mp = o->op_madprop;
2487 if (mp) {
2488 for (;;) {
2489 /* pretend constant fold didn't happen? */
2490 if (mp->mad_key == 'f' &&
2491 (o->op_type == OP_CONST ||
2492 o->op_type == OP_GV) )
2493 {
2494 op_getmad(from,(OP*)mp->mad_val,slot);
2495 return;
2496 }
2497 if (!mp->mad_next)
2498 break;
2499 mp = mp->mad_next;
2500 }
2501 mp->mad_next = newMADPROP(slot,MAD_OP,from,0);
2502 }
2503 else {
2504 o->op_madprop = newMADPROP(slot,MAD_OP,from,0);
2505 }
2506 }
2507}
2508
2509void
2510Perl_op_getmad(pTHX_ OP* from, OP* o, char slot)
2511{
2512 MADPROP* mp;
2513 if (!from)
2514 return;
2515 if (o) {
2516 mp = o->op_madprop;
2517 if (mp) {
2518 for (;;) {
2519 /* pretend constant fold didn't happen? */
2520 if (mp->mad_key == 'f' &&
2521 (o->op_type == OP_CONST ||
2522 o->op_type == OP_GV) )
2523 {
2524 op_getmad(from,(OP*)mp->mad_val,slot);
2525 return;
2526 }
2527 if (!mp->mad_next)
2528 break;
2529 mp = mp->mad_next;
2530 }
2531 mp->mad_next = newMADPROP(slot,MAD_OP,from,1);
2532 }
2533 else {
2534 o->op_madprop = newMADPROP(slot,MAD_OP,from,1);
2535 }
2536 }
2537 else {
99129197
NC		 2538 PerlIO_printf(PerlIO_stderr(),
2539 "DESTROYING op = %0"UVxf"\n", PTR2UV(from));
eb8433b7
NC		 2540 op_free(from);
2541 }
2542}
2543
2544void
2545Perl_prepend_madprops(pTHX_ MADPROP* mp, OP* o, char slot)
2546{
2547 MADPROP* tm;
2548 if (!mp || !o)
2549 return;
2550 if (slot)
2551 mp->mad_key = slot;
2552 tm = o->op_madprop;
2553 o->op_madprop = mp;
2554 for (;;) {
2555 if (!mp->mad_next)
2556 break;
2557 mp = mp->mad_next;
2558 }
2559 mp->mad_next = tm;
2560}
2561
2562void
2563Perl_append_madprops(pTHX_ MADPROP* tm, OP* o, char slot)
2564{
2565 if (!o)
2566 return;
2567 addmad(tm, &(o->op_madprop), slot);
2568}
2569
2570void
2571Perl_addmad(pTHX_ MADPROP* tm, MADPROP** root, char slot)
2572{
2573 MADPROP* mp;
2574 if (!tm || !root)
2575 return;
2576 if (slot)
2577 tm->mad_key = slot;
2578 mp = *root;
2579 if (!mp) {
2580 *root = tm;
2581 return;
2582 }
2583 for (;;) {
2584 if (!mp->mad_next)
2585 break;
2586 mp = mp->mad_next;
2587 }
2588 mp->mad_next = tm;
2589}
2590
2591MADPROP *
2592Perl_newMADsv(pTHX_ char key, SV* sv)
2593{
2594 return newMADPROP(key, MAD_SV, sv, 0);
2595}
2596
2597MADPROP *
2598Perl_newMADPROP(pTHX_ char key, char type, void* val, I32 vlen)
2599{
2600 MADPROP *mp;
99129197 2601 Newxz(mp, 1, MADPROP);
eb8433b7
NC		 2602 mp->mad_next = 0;
2603 mp->mad_key = key;
2604 mp->mad_vlen = vlen;
2605 mp->mad_type = type;
2606 mp->mad_val = val;
2607/* PerlIO_printf(PerlIO_stderr(), "NEW mp = %0x\n", mp); */
2608 return mp;
2609}
2610
2611void
2612Perl_mad_free(pTHX_ MADPROP* mp)
2613{
2614/* PerlIO_printf(PerlIO_stderr(), "FREE mp = %0x\n", mp); */
2615 if (!mp)
2616 return;
2617 if (mp->mad_next)
2618 mad_free(mp->mad_next);
2619/* if (PL_lex_state != LEX_NOTPARSING && mp->mad_vlen)
2620 PerlIO_printf(PerlIO_stderr(), "DESTROYING '%c'=<%s>\n", mp->mad_key & 255, mp->mad_val); */
2621 switch (mp->mad_type) {
2622 case MAD_NULL:
2623 break;
2624 case MAD_PV:
2625 Safefree((char*)mp->mad_val);
2626 break;
2627 case MAD_OP:
2628 if (mp->mad_vlen) /* vlen holds "strong/weak" boolean */
2629 op_free((OP*)mp->mad_val);
2630 break;
2631 case MAD_SV:
2632 sv_free((SV*)mp->mad_val);
2633 break;
2634 default:
2635 PerlIO_printf(PerlIO_stderr(), "Unrecognized mad\n");
2636 break;
2637 }
2638 Safefree(mp);
2639}
2640
2641#endif
2642
79072805 2643OP *
864dbfa3 2644Perl_newNULLLIST(pTHX)
79072805 2645{
8990e307
LW		 2646 return newOP(OP_STUB, 0);
2647}
2648
2649OP *
864dbfa3 2650Perl_force_list(pTHX_ OP *o)
8990e307 2651{
11343788 2652 if (!o || o->op_type != OP_LIST)
5f66b61c 2653 o = newLISTOP(OP_LIST, 0, o, NULL);
93c66552 2654 op_null(o);
11343788 2655 return o;
79072805
LW		 2656}
2657
2658OP *
864dbfa3 2659Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805 2660{
27da23d5 2661 dVAR;
79072805
LW		 2662 LISTOP *listop;
2663
b7dc083c 2664 NewOp(1101, listop, 1, LISTOP);
79072805 2665
eb160463 2666 listop->op_type = (OPCODE)type;
22c35a8c 2667 listop->op_ppaddr = PL_ppaddr[type];
117dada2
SM		 2668 if (first || last)
2669 flags |= OPf_KIDS;
eb160463 2670 listop->op_flags = (U8)flags;
79072805
LW		 2671
2672 if (!last && first)
2673 last = first;
2674 else if (!first && last)
2675 first = last;
8990e307
LW		 2676 else if (first)
2677 first->op_sibling = last;
79072805
LW		 2678 listop->op_first = first;
2679 listop->op_last = last;
8990e307 2680 if (type == OP_LIST) {
551405c4 2681 OP* const pushop = newOP(OP_PUSHMARK, 0);
8990e307
LW		 2682 pushop->op_sibling = first;
2683 listop->op_first = pushop;
2684 listop->op_flags |= OPf_KIDS;
2685 if (!last)
2686 listop->op_last = pushop;
2687 }
79072805 2688
463d09e6 2689 return CHECKOP(type, listop);
79072805
LW		 2690}
2691
2692OP *
864dbfa3 2693Perl_newOP(pTHX_ I32 type, I32 flags)
79072805 2694{
27da23d5 2695 dVAR;
11343788 2696 OP *o;
b7dc083c 2697 NewOp(1101, o, 1, OP);
eb160463 2698 o->op_type = (OPCODE)type;
22c35a8c 2699 o->op_ppaddr = PL_ppaddr[type];
eb160463 2700 o->op_flags = (U8)flags;
79072805 2701
11343788 2702 o->op_next = o;
eb160463 2703 o->op_private = (U8)(0 | (flags >> 8));
22c35a8c 2704 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2705 scalar(o);
22c35a8c 2706 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2707 o->op_targ = pad_alloc(type, SVs_PADTMP);
2708 return CHECKOP(type, o);
79072805
LW		 2709}
2710
2711OP *
864dbfa3 2712Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first)
79072805 2713{
27da23d5 2714 dVAR;
79072805
LW		 2715 UNOP *unop;
2716
93a17b20 2717 if (!first)
aeea060c 2718 first = newOP(OP_STUB, 0);
22c35a8c 2719 if (PL_opargs[type] & OA_MARK)
8990e307 2720 first = force_list(first);
93a17b20 2721
b7dc083c 2722 NewOp(1101, unop, 1, UNOP);
eb160463 2723 unop->op_type = (OPCODE)type;
22c35a8c 2724 unop->op_ppaddr = PL_ppaddr[type];
79072805 2725 unop->op_first = first;
585ec06d 2726 unop->op_flags = (U8)(flags | OPf_KIDS);
eb160463 2727 unop->op_private = (U8)(1 | (flags >> 8));
e50aee73 2728 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2729 if (unop->op_next)
2730 return (OP*)unop;
2731
a0d0e21e 2732 return fold_constants((OP *) unop);
79072805
LW		 2733}
2734
2735OP *
864dbfa3 2736Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805 2737{
27da23d5 2738 dVAR;
79072805 2739 BINOP *binop;
b7dc083c 2740 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2741
2742 if (!first)
2743 first = newOP(OP_NULL, 0);
2744
eb160463 2745 binop->op_type = (OPCODE)type;
22c35a8c 2746 binop->op_ppaddr = PL_ppaddr[type];
79072805 2747 binop->op_first = first;
585ec06d 2748 binop->op_flags = (U8)(flags | OPf_KIDS);
79072805
LW		 2749 if (!last) {
2750 last = first;
eb160463 2751 binop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 2752 }
2753 else {
eb160463 2754 binop->op_private = (U8)(2 | (flags >> 8));
79072805
LW		 2755 first->op_sibling = last;
2756 }
2757
e50aee73 2758 binop = (BINOP*)CHECKOP(type, binop);
eb160463 2759 if (binop->op_next || binop->op_type != (OPCODE)type)
79072805
LW		 2760 return (OP*)binop;
2761
7284ab6f 2762 binop->op_last = binop->op_first->op_sibling;
79072805 2763
a0d0e21e 2764 return fold_constants((OP *)binop);
79072805
LW		 2765}
2766
5f66b61c
AL		 2767static int uvcompare(const void *a, const void *b)
2768 __attribute__nonnull__(1)
2769 __attribute__nonnull__(2)
2770 __attribute__pure__;
abb2c242 2771static int uvcompare(const void *a, const void *b)
2b9d42f0 2772{
e1ec3a88 2773 if (*((const UV *)a) < (*(const UV *)b))
2b9d42f0 2774 return -1;
e1ec3a88 2775 if (*((const UV *)a) > (*(const UV *)b))
2b9d42f0 2776 return 1;
e1ec3a88 2777 if (*((const UV *)a+1) < (*(const UV *)b+1))
2b9d42f0 2778 return -1;
e1ec3a88 2779 if (*((const UV *)a+1) > (*(const UV *)b+1))
2b9d42f0 2780 return 1;
a0ed51b3
LW		 2781 return 0;
2782}
2783
79072805 2784OP *
864dbfa3 2785Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2786{
97aff369 2787 dVAR;
2d03de9c
AL		 2788 SV * const tstr = ((SVOP*)expr)->op_sv;
2789 SV * const rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2790 STRLEN tlen;
2791 STRLEN rlen;
5c144d81
NC		 2792 const U8 *t = (U8*)SvPV_const(tstr, tlen);
2793 const U8 *r = (U8*)SvPV_const(rstr, rlen);
79072805
LW		 2794 register I32 i;
2795 register I32 j;
9b877dbb 2796 I32 grows = 0;
79072805
LW		 2797 register short *tbl;
2798
551405c4
AL		 2799 const I32 complement = o->op_private & OPpTRANS_COMPLEMENT;
2800 const I32 squash = o->op_private & OPpTRANS_SQUASH;
2801 I32 del = o->op_private & OPpTRANS_DELETE;
800b4dc4 2802 PL_hints |= HINT_BLOCK_SCOPE;
1c846c1f 2803
036b4402
GS		 2804 if (SvUTF8(tstr))
2805 o->op_private |= OPpTRANS_FROM_UTF;
1c846c1f
NIS		 2806
2807 if (SvUTF8(rstr))
036b4402 2808 o->op_private |= OPpTRANS_TO_UTF;
79072805 2809
a0ed51b3 2810 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
396482e1 2811 SV* const listsv = newSVpvs("# comment\n");
c445ea15 2812 SV* transv = NULL;
5c144d81
NC		 2813 const U8* tend = t + tlen;
2814 const U8* rend = r + rlen;
ba210ebe 2815 STRLEN ulen;
84c133a0
RB		 2816 UV tfirst = 1;
2817 UV tlast = 0;
2818 IV tdiff;
2819 UV rfirst = 1;
2820 UV rlast = 0;
2821 IV rdiff;
2822 IV diff;
a0ed51b3
LW		 2823 I32 none = 0;
2824 U32 max = 0;
2825 I32 bits;
a0ed51b3 2826 I32 havefinal = 0;
9c5ffd7c 2827 U32 final = 0;
551405c4
AL		 2828 const I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2829 const I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
bf4a1e57
JH		 2830 U8* tsave = NULL;
2831 U8* rsave = NULL;
9f7f3913 2832 const U32 flags = UTF8_ALLOW_DEFAULT;
bf4a1e57
JH		 2833
2834 if (!from_utf) {
2835 STRLEN len = tlen;
5c144d81 2836 t = tsave = bytes_to_utf8(t, &len);
bf4a1e57
JH		 2837 tend = t + len;
2838 }
2839 if (!to_utf && rlen) {
2840 STRLEN len = rlen;
5c144d81 2841 r = rsave = bytes_to_utf8(r, &len);
bf4a1e57
JH		 2842 rend = r + len;
2843 }
a0ed51b3 2844
2b9d42f0
NIS		 2845/* There are several snags with this code on EBCDIC:
2846 1. 0xFF is a legal UTF-EBCDIC byte (there are no illegal bytes).
2847 2. scan_const() in toke.c has encoded chars in native encoding which makes
2848 ranges at least in EBCDIC 0..255 range the bottom odd.
2849*/
2850
a0ed51b3 2851 if (complement) {
89ebb4a3 2852 U8 tmpbuf[UTF8_MAXBYTES+1];
2b9d42f0 2853 UV *cp;
a0ed51b3 2854 UV nextmin = 0;
a02a5408 2855 Newx(cp, 2*tlen, UV);
a0ed51b3 2856 i = 0;
396482e1 2857 transv = newSVpvs("");
a0ed51b3 2858 while (t < tend) {
9f7f3913 2859 cp[2*i] = utf8n_to_uvuni(t, tend-t, &ulen, flags);
2b9d42f0
NIS		 2860 t += ulen;
2861 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) {
a0ed51b3 2862 t++;
9f7f3913 2863 cp[2*i+1] = utf8n_to_uvuni(t, tend-t, &ulen, flags);
2b9d42f0 2864 t += ulen;
a0ed51b3 2865 }
2b9d42f0
NIS		 2866 else {
2867 cp[2*i+1] = cp[2*i];
2868 }
2869 i++;
a0ed51b3 2870 }
2b9d42f0 2871 qsort(cp, i, 2*sizeof(UV), uvcompare);
a0ed51b3 2872 for (j = 0; j < i; j++) {
2b9d42f0 2873 UV val = cp[2*j];
a0ed51b3
LW		 2874 diff = val - nextmin;
2875 if (diff > 0) {
9041c2e3 2876 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2877 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3 2878 if (diff > 1) {
2b9d42f0 2879 U8 range_mark = UTF_TO_NATIVE(0xff);
9041c2e3 2880 t = uvuni_to_utf8(tmpbuf, val - 1);
2b9d42f0 2881 sv_catpvn(transv, (char *)&range_mark, 1);
dfe13c55 2882 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2883 }
2884 }
2b9d42f0 2885 val = cp[2*j+1];
a0ed51b3
LW		 2886 if (val >= nextmin)
2887 nextmin = val + 1;
2888 }
9041c2e3 2889 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2890 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2b9d42f0
NIS		 2891 {
2892 U8 range_mark = UTF_TO_NATIVE(0xff);
2893 sv_catpvn(transv, (char *)&range_mark, 1);
2894 }
b851fbc1
JH		 2895 t = uvuni_to_utf8_flags(tmpbuf, 0x7fffffff,
2896 UNICODE_ALLOW_SUPER);
dfe13c55 2897 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
93524f2b 2898 t = (const U8*)SvPVX_const(transv);
a0ed51b3
LW		 2899 tlen = SvCUR(transv);
2900 tend = t + tlen;
455d824a 2901 Safefree(cp);
a0ed51b3
LW		 2902 }
2903 else if (!rlen && !del) {
2904 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2905 }
2906 if (!squash) {
05d340b8 2907 if ((!rlen && !del) || t == r ||
12ae5dfc 2908 (tlen == rlen && memEQ((char *)t, (char *)r, tlen)))
01ec43d0 2909 {
4757a243 2910 o->op_private |= OPpTRANS_IDENTICAL;
01ec43d0 2911 }
a0ed51b3
LW		 2912 }
2913
2914 while (t < tend || tfirst <= tlast) {
2915 /* see if we need more "t" chars */
2916 if (tfirst > tlast) {
9f7f3913 2917 tfirst = (I32)utf8n_to_uvuni(t, tend - t, &ulen, flags);
a0ed51b3 2918 t += ulen;
2b9d42f0 2919 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2920 t++;
9f7f3913 2921 tlast = (I32)utf8n_to_uvuni(t, tend - t, &ulen, flags);
a0ed51b3
LW		 2922 t += ulen;
2923 }
2924 else
2925 tlast = tfirst;
2926 }
2927
2928 /* now see if we need more "r" chars */
2929 if (rfirst > rlast) {
2930 if (r < rend) {
9f7f3913 2931 rfirst = (I32)utf8n_to_uvuni(r, rend - r, &ulen, flags);
a0ed51b3 2932 r += ulen;
2b9d42f0 2933 if (r < rend && NATIVE_TO_UTF(*r) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2934 r++;
9f7f3913 2935 rlast = (I32)utf8n_to_uvuni(r, rend - r, &ulen, flags);
a0ed51b3
LW		 2936 r += ulen;
2937 }
2938 else
2939 rlast = rfirst;
2940 }
2941 else {
2942 if (!havefinal++)
2943 final = rlast;
2944 rfirst = rlast = 0xffffffff;
2945 }
2946 }
2947
2948 /* now see which range will peter our first, if either. */
2949 tdiff = tlast - tfirst;
2950 rdiff = rlast - rfirst;
2951
2952 if (tdiff <= rdiff)
2953 diff = tdiff;
2954 else
2955 diff = rdiff;
2956
2957 if (rfirst == 0xffffffff) {
2958 diff = tdiff; /* oops, pretend rdiff is infinite */
2959 if (diff > 0)
894356b3
GS		 2960 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\tXXXX\n",
2961 (long)tfirst, (long)tlast);
a0ed51b3 2962 else
894356b3 2963 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\tXXXX\n", (long)tfirst);
a0ed51b3
LW		 2964 }
2965 else {
2966 if (diff > 0)
894356b3
GS		 2967 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\t%04lx\n",
2968 (long)tfirst, (long)(tfirst + diff),
2969 (long)rfirst);
a0ed51b3 2970 else
894356b3
GS		 2971 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\t%04lx\n",
2972 (long)tfirst, (long)rfirst);
a0ed51b3
LW		 2973
2974 if (rfirst + diff > max)
2975 max = rfirst + diff;
9b877dbb 2976 if (!grows)
45005bfb
JH		 2977 grows = (tfirst < rfirst &&
2978 UNISKIP(tfirst) < UNISKIP(rfirst + diff));
2979 rfirst += diff + 1;
a0ed51b3
LW		 2980 }
2981 tfirst += diff + 1;
2982 }
2983
2984 none = ++max;
2985 if (del)
2986 del = ++max;
2987
2988 if (max > 0xffff)
2989 bits = 32;
2990 else if (max > 0xff)
2991 bits = 16;
2992 else
2993 bits = 8;
2994
455d824a 2995 Safefree(cPVOPo->op_pv);
a0ed51b3
LW		 2996 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
2997 SvREFCNT_dec(listsv);
b37c2d43 2998 SvREFCNT_dec(transv);
a0ed51b3 2999
45005bfb 3000 if (!del && havefinal && rlen)
b448e4fe
JH		 3001 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5,
3002 newSVuv((UV)final), 0);
a0ed51b3 3003
9b877dbb 3004 if (grows)
a0ed51b3
LW		 3005 o->op_private |= OPpTRANS_GROWS;
3006
b37c2d43
AL		 3007 Safefree(tsave);
3008 Safefree(rsave);
9b877dbb 3009
eb8433b7
NC		 3010#ifdef PERL_MAD
3011 op_getmad(expr,o,'e');
3012 op_getmad(repl,o,'r');
3013#else
a0ed51b3
LW		 3014 op_free(expr);
3015 op_free(repl);
eb8433b7 3016#endif
a0ed51b3
LW		 3017 return o;
3018 }
3019
3020 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 3021 if (complement) {
3022 Zero(tbl, 256, short);
eb160463 3023 for (i = 0; i < (I32)tlen; i++)
ec49126f 3024 tbl[t[i]] = -1;
79072805
LW		 3025 for (i = 0, j = 0; i < 256; i++) {
3026 if (!tbl[i]) {
eb160463 3027 if (j >= (I32)rlen) {
a0ed51b3 3028 if (del)
79072805
LW		 3029 tbl[i] = -2;
3030 else if (rlen)
ec49126f 3031 tbl[i] = r[j-1];
79072805 3032 else
eb160463 3033 tbl[i] = (short)i;
79072805 3034 }
9b877dbb
IH		 3035 else {
3036 if (i < 128 && r[j] >= 128)
3037 grows = 1;
ec49126f 3038 tbl[i] = r[j++];
9b877dbb 3039 }
79072805
LW		 3040 }
3041 }
05d340b8
JH		 3042 if (!del) {
3043 if (!rlen) {
3044 j = rlen;
3045 if (!squash)
3046 o->op_private |= OPpTRANS_IDENTICAL;
3047 }
eb160463 3048 else if (j >= (I32)rlen)
05d340b8
JH		 3049 j = rlen - 1;
3050 else
3051 cPVOPo->op_pv = (char*)Renew(tbl, 0x101+rlen-j, short);
585ec06d 3052 tbl[0x100] = (short)(rlen - j);
eb160463 3053 for (i=0; i < (I32)rlen - j; i++)
8973db79
JH		 3054 tbl[0x101+i] = r[j+i];
3055 }
79072805
LW		 3056 }
3057 else {
a0ed51b3 3058 if (!rlen && !del) {
79072805 3059 r = t; rlen = tlen;
5d06d08e 3060 if (!squash)
4757a243 3061 o->op_private |= OPpTRANS_IDENTICAL;
79072805 3062 }
94bfe852
RGS		 3063 else if (!squash && rlen == tlen && memEQ((char*)t, (char*)r, tlen)) {
3064 o->op_private |= OPpTRANS_IDENTICAL;
3065 }
79072805
LW		 3066 for (i = 0; i < 256; i++)
3067 tbl[i] = -1;
eb160463
GS		 3068 for (i = 0, j = 0; i < (I32)tlen; i++,j++) {
3069 if (j >= (I32)rlen) {
a0ed51b3 3070 if (del) {
ec49126f 3071 if (tbl[t[i]] == -1)
3072 tbl[t[i]] = -2;
79072805
LW		 3073 continue;
3074 }
3075 --j;
3076 }
9b877dbb
IH		 3077 if (tbl[t[i]] == -1) {
3078 if (t[i] < 128 && r[j] >= 128)
3079 grows = 1;
ec49126f 3080 tbl[t[i]] = r[j];
9b877dbb 3081 }
79072805
LW		 3082 }
3083 }
9b877dbb
IH		 3084 if (grows)
3085 o->op_private |= OPpTRANS_GROWS;
eb8433b7
NC		 3086#ifdef PERL_MAD
3087 op_getmad(expr,o,'e');
3088 op_getmad(repl,o,'r');
3089#else
79072805
LW		 3090 op_free(expr);
3091 op_free(repl);
eb8433b7 3092#endif
79072805 3093
11343788 3094 return o;
79072805
LW		 3095}
3096
3097OP *
864dbfa3 3098Perl_newPMOP(pTHX_ I32 type, I32 flags)
79072805 3099{
27da23d5 3100 dVAR;
79072805
LW		 3101 PMOP *pmop;
3102
b7dc083c 3103 NewOp(1101, pmop, 1, PMOP);
eb160463 3104 pmop->op_type = (OPCODE)type;
22c35a8c 3105 pmop->op_ppaddr = PL_ppaddr[type];
eb160463
GS		 3106 pmop->op_flags = (U8)flags;
3107 pmop->op_private = (U8)(0 | (flags >> 8));
79072805 3108
3280af22 3109 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 3110 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 3111 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 3112 pmop->op_pmpermflags |= PMf_LOCALE;
3113 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 3114
debc9467 3115#ifdef USE_ITHREADS
551405c4
AL		 3116 if (av_len((AV*) PL_regex_pad[0]) > -1) {
3117 SV * const repointer = av_pop((AV*)PL_regex_pad[0]);
3118 pmop->op_pmoffset = SvIV(repointer);
3119 SvREPADTMP_off(repointer);
3120 sv_setiv(repointer,0);
3121 } else {
3122 SV * const repointer = newSViv(0);
b37c2d43 3123 av_push(PL_regex_padav, SvREFCNT_inc_simple_NN(repointer));
551405c4
AL		 3124 pmop->op_pmoffset = av_len(PL_regex_padav);
3125 PL_regex_pad = AvARRAY(PL_regex_padav);
13137afc 3126 }
debc9467 3127#endif
1eb1540c 3128
1fcf4c12 3129 /* link into pm list */
3280af22 3130 if (type != OP_TRANS && PL_curstash) {
8d2f4536
NC		 3131 MAGIC *mg = mg_find((SV*)PL_curstash, PERL_MAGIC_symtab);
3132
3133 if (!mg) {
3134 mg = sv_magicext((SV*)PL_curstash, 0, PERL_MAGIC_symtab, 0, 0, 0);
3135 }
3136 pmop->op_pmnext = (PMOP*)mg->mg_obj;
3137 mg->mg_obj = (SV*)pmop;
cb55de95 3138 PmopSTASH_set(pmop,PL_curstash);
79072805
LW		 3139 }
3140
463d09e6 3141 return CHECKOP(type, pmop);
79072805
LW		 3142}
3143
131b3ad0
DM		 3144/* Given some sort of match op o, and an expression expr containing a
3145 * pattern, either compile expr into a regex and attach it to o (if it's
3146 * constant), or convert expr into a runtime regcomp op sequence (if it's
3147 * not)
3148 *
3149 * isreg indicates that the pattern is part of a regex construct, eg
3150 * $x =~ /pattern/ or split /pattern/, as opposed to $x =~ $pattern or
3151 * split "pattern", which aren't. In the former case, expr will be a list
3152 * if the pattern contains more than one term (eg /a$b/) or if it contains
3153 * a replacement, ie s/// or tr///.
3154 */
3155
79072805 3156OP *
131b3ad0 3157Perl_pmruntime(pTHX_ OP *o, OP *expr, bool isreg)
79072805 3158{
27da23d5 3159 dVAR;
79072805
LW		 3160 PMOP *pm;
3161 LOGOP *rcop;
ce862d02 3162 I32 repl_has_vars = 0;
5f66b61c 3163 OP* repl = NULL;
131b3ad0
DM		 3164 bool reglist;
3165
3166 if (o->op_type == OP_SUBST || o->op_type == OP_TRANS) {
3167 /* last element in list is the replacement; pop it */
3168 OP* kid;
3169 repl = cLISTOPx(expr)->op_last;
3170 kid = cLISTOPx(expr)->op_first;
3171 while (kid->op_sibling != repl)
3172 kid = kid->op_sibling;
5f66b61c 3173 kid->op_sibling = NULL;
131b3ad0
DM		 3174 cLISTOPx(expr)->op_last = kid;
3175 }
79072805 3176
131b3ad0
DM		 3177 if (isreg && expr->op_type == OP_LIST &&
3178 cLISTOPx(expr)->op_first->op_sibling == cLISTOPx(expr)->op_last)
3179 {
3180 /* convert single element list to element */
0bd48802 3181 OP* const oe = expr;
131b3ad0 3182 expr = cLISTOPx(oe)->op_first->op_sibling;
5f66b61c
AL		 3183 cLISTOPx(oe)->op_first->op_sibling = NULL;
3184 cLISTOPx(oe)->op_last = NULL;
131b3ad0
DM		 3185 op_free(oe);
3186 }
3187
3188 if (o->op_type == OP_TRANS) {
11343788 3189 return pmtrans(o, expr, repl);
131b3ad0
DM		 3190 }
3191
3192 reglist = isreg && expr->op_type == OP_LIST;
3193 if (reglist)
3194 op_null(expr);
79072805 3195
3280af22 3196 PL_hints |= HINT_BLOCK_SCOPE;
11343788 3197 pm = (PMOP*)o;
79072805
LW		 3198
3199 if (expr->op_type == OP_CONST) {
463ee0b2 3200 STRLEN plen;
6136c704 3201 SV * const pat = ((SVOP*)expr)->op_sv;
5c144d81 3202 const char *p = SvPV_const(pat, plen);
770526c1 3203 if ((o->op_flags & OPf_SPECIAL) && (*p == ' ' && p[1] == '\0')) {
5c144d81
NC		 3204 U32 was_readonly = SvREADONLY(pat);
3205
3206 if (was_readonly) {
3207 if (SvFAKE(pat)) {
3208 sv_force_normal_flags(pat, 0);
3209 assert(!SvREADONLY(pat));
3210 was_readonly = 0;
3211 } else {
3212 SvREADONLY_off(pat);
3213 }
3214 }
3215
93a17b20 3216 sv_setpvn(pat, "\\s+", 3);
5c144d81
NC		 3217
3218 SvFLAGS(pat) |= was_readonly;
3219
3220 p = SvPV_const(pat, plen);
79072805
LW		 3221 pm->op_pmflags |= PMf_SKIPWHITE;
3222 }
5b71a6a7 3223 if (DO_UTF8(pat))
a5961de5 3224 pm->op_pmdynflags |= PMdf_UTF8;
5c144d81
NC		 3225 /* FIXME - can we make this function take const char * args? */
3226 PM_SETRE(pm, CALLREGCOMP(aTHX_ (char*)p, (char*)p + plen, pm));
aaa362c4 3227 if (strEQ("\\s+", PM_GETRE(pm)->precomp))
85e6fe83 3228 pm->op_pmflags |= PMf_WHITE;
eb8433b7
NC		 3229#ifdef PERL_MAD
3230 op_getmad(expr,(OP*)pm,'e');
3231#else
79072805 3232 op_free(expr);
eb8433b7 3233#endif
79072805
LW		 3234 }
3235 else {
3280af22 3236 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
1c846c1f 3237 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 3238 ? OP_REGCRESET
3239 : OP_REGCMAYBE),0,expr);
463ee0b2 3240
b7dc083c 3241 NewOp(1101, rcop, 1, LOGOP);
79072805 3242 rcop->op_type = OP_REGCOMP;
22c35a8c 3243 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 3244 rcop->op_first = scalar(expr);
131b3ad0
DM		 3245 rcop->op_flags |= OPf_KIDS
3246 | ((PL_hints & HINT_RE_EVAL) ? OPf_SPECIAL : 0)
3247 | (reglist ? OPf_STACKED : 0);
79072805 3248 rcop->op_private = 1;
11343788 3249 rcop->op_other = o;
131b3ad0
DM		 3250 if (reglist)
3251 rcop->op_targ = pad_alloc(rcop->op_type, SVs_PADTMP);
3252
b5c19bd7
DM		 3253 /* /$x/ may cause an eval, since $x might be qr/(?{..})/ */
3254 PL_cv_has_eval = 1;
79072805
LW		 3255
3256 /* establish postfix order */
3280af22 3257 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 3258 LINKLIST(expr);
3259 rcop->op_next = expr;
3260 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
3261 }
3262 else {
3263 rcop->op_next = LINKLIST(expr);
3264 expr->op_next = (OP*)rcop;
3265 }
79072805 3266
11343788 3267 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 3268 }
3269
3270 if (repl) {
748a9306 3271 OP *curop;
0244c3a4 3272 if (pm->op_pmflags & PMf_EVAL) {
6136c704 3273 curop = NULL;
8bafa735 3274 if (CopLINE(PL_curcop) < (line_t)PL_multi_end)
eb160463 3275 CopLINE_set(PL_curcop, (line_t)PL_multi_end);
0244c3a4 3276 }
748a9306
LW		 3277 else if (repl->op_type == OP_CONST)
3278 curop = repl;
79072805 3279 else {
c445ea15 3280 OP *lastop = NULL;
79072805 3281 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 3282 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 3283 if (curop->op_type == OP_GV) {
6136c704 3284 GV * const gv = cGVOPx_gv(curop);
ce862d02 3285 repl_has_vars = 1;
f702bf4a 3286 if (strchr("&`'123456789+-\016\022", *GvENAME(gv)))
79072805
LW		 3287 break;
3288 }
3289 else if (curop->op_type == OP_RV2CV)
3290 break;
3291 else if (curop->op_type == OP_RV2SV ||
3292 curop->op_type == OP_RV2AV ||
3293 curop->op_type == OP_RV2HV ||
3294 curop->op_type == OP_RV2GV) {
3295 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
3296 break;
3297 }
748a9306
LW		 3298 else if (curop->op_type == OP_PADSV ||
3299 curop->op_type == OP_PADAV ||
3300 curop->op_type == OP_PADHV ||
554b3eca 3301 curop->op_type == OP_PADANY) {
ce862d02 3302 repl_has_vars = 1;
748a9306 3303 }
1167e5da 3304 else if (curop->op_type == OP_PUSHRE)
6f207bd3 3305 NOOP; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 3306 else
3307 break;
3308 }
3309 lastop = curop;
3310 }
748a9306 3311 }
ce862d02 3312 if (curop == repl
1c846c1f 3313 && !(repl_has_vars
aaa362c4
RS		 3314 && (!PM_GETRE(pm)
3315 || PM_GETRE(pm)->reganch & ROPT_EVAL_SEEN))) {
748a9306 3316 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 3317 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 3318 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 3319 }
3320 else {
aaa362c4 3321 if (curop == repl && !PM_GETRE(pm)) { /* Has variables. */
ce862d02
IZ		 3322 pm->op_pmflags |= PMf_MAYBE_CONST;
3323 pm->op_pmpermflags |= PMf_MAYBE_CONST;
3324 }
b7dc083c 3325 NewOp(1101, rcop, 1, LOGOP);
748a9306 3326 rcop->op_type = OP_SUBSTCONT;
22c35a8c 3327 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 3328 rcop->op_first = scalar(repl);
3329 rcop->op_flags |= OPf_KIDS;
3330 rcop->op_private = 1;
11343788 3331 rcop->op_other = o;
748a9306
LW		 3332
3333 /* establish postfix order */
3334 rcop->op_next = LINKLIST(repl);
3335 repl->op_next = (OP*)rcop;
3336
3337 pm->op_pmreplroot = scalar((OP*)rcop);
3338 pm->op_pmreplstart = LINKLIST(rcop);
3339 rcop->op_next = 0;
79072805
LW		 3340 }
3341 }
3342
3343 return (OP*)pm;
3344}
3345
3346OP *
864dbfa3 3347Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv)
79072805 3348{
27da23d5 3349 dVAR;
79072805 3350 SVOP *svop;
b7dc083c 3351 NewOp(1101, svop, 1, SVOP);
eb160463 3352 svop->op_type = (OPCODE)type;
22c35a8c 3353 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3354 svop->op_sv = sv;
3355 svop->op_next = (OP*)svop;
eb160463 3356 svop->op_flags = (U8)flags;
22c35a8c 3357 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 3358 scalar((OP*)svop);
22c35a8c 3359 if (PL_opargs[type] & OA_TARGET)
ed6116ce 3360 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 3361 return CHECKOP(type, svop);
79072805
LW		 3362}
3363
3364OP *
350de78d
GS		 3365Perl_newPADOP(pTHX_ I32 type, I32 flags, SV *sv)
3366{
27da23d5 3367 dVAR;
350de78d
GS		 3368 PADOP *padop;
3369 NewOp(1101, padop, 1, PADOP);
eb160463 3370 padop->op_type = (OPCODE)type;
350de78d
GS		 3371 padop->op_ppaddr = PL_ppaddr[type];
3372 padop->op_padix = pad_alloc(type, SVs_PADTMP);
dd2155a4
DM		 3373 SvREFCNT_dec(PAD_SVl(padop->op_padix));
3374 PAD_SETSV(padop->op_padix, sv);
ce50c033
AMS		 3375 if (sv)
3376 SvPADTMP_on(sv);
350de78d 3377 padop->op_next = (OP*)padop;
eb160463 3378 padop->op_flags = (U8)flags;
350de78d
GS		 3379 if (PL_opargs[type] & OA_RETSCALAR)
3380 scalar((OP*)padop);
3381 if (PL_opargs[type] & OA_TARGET)
3382 padop->op_targ = pad_alloc(type, SVs_PADTMP);
3383 return CHECKOP(type, padop);
3384}
3385
3386OP *
864dbfa3 3387Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
79072805 3388{
27da23d5 3389 dVAR;
350de78d 3390#ifdef USE_ITHREADS
ce50c033
AMS		 3391 if (gv)
3392 GvIN_PAD_on(gv);
b37c2d43 3393 return newPADOP(type, flags, SvREFCNT_inc_simple(gv));
350de78d 3394#else
b37c2d43 3395 return newSVOP(type, flags, SvREFCNT_inc_simple(gv));
350de78d 3396#endif
79072805
LW		 3397}
3398
3399OP *
864dbfa3 3400Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv)
79072805 3401{
27da23d5 3402 dVAR;
79072805 3403 PVOP *pvop;
b7dc083c 3404 NewOp(1101, pvop, 1, PVOP);
eb160463 3405 pvop->op_type = (OPCODE)type;
22c35a8c 3406 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3407 pvop->op_pv = pv;
3408 pvop->op_next = (OP*)pvop;
eb160463 3409 pvop->op_flags = (U8)flags;
22c35a8c 3410 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 3411 scalar((OP*)pvop);
22c35a8c 3412 if (PL_opargs[type] & OA_TARGET)
ed6116ce 3413 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 3414 return CHECKOP(type, pvop);
79072805
LW		 3415}
3416
eb8433b7
NC		 3417#ifdef PERL_MAD
3418OP*
3419#else
79072805 3420void
eb8433b7 3421#endif
864dbfa3 3422Perl_package(pTHX_ OP *o)
79072805 3423{
97aff369 3424 dVAR;
6867be6d 3425 const char *name;
de11ba31 3426 STRLEN len;
eb8433b7
NC		 3427#ifdef PERL_MAD
3428 OP *pegop;
3429#endif
79072805 3430
3280af22
NIS		 3431 save_hptr(&PL_curstash);
3432 save_item(PL_curstname);
de11ba31 3433
5c144d81 3434 name = SvPV_const(cSVOPo->op_sv, len);
de11ba31
AMS		 3435 PL_curstash = gv_stashpvn(name, len, TRUE);
3436 sv_setpvn(PL_curstname, name, len);
de11ba31 3437
7ad382f4 3438 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 3439 PL_copline = NOLINE;
3440 PL_expect = XSTATE;
eb8433b7
NC		 3441
3442#ifndef PERL_MAD
3443 op_free(o);
3444#else
3445 if (!PL_madskills) {
3446 op_free(o);
1d866c12 3447 return NULL;
eb8433b7
NC		 3448 }
3449
3450 pegop = newOP(OP_NULL,0);
3451 op_getmad(o,pegop,'P');
3452 return pegop;
3453#endif
79072805
LW		 3454}
3455
eb8433b7
NC		 3456#ifdef PERL_MAD
3457OP*
3458#else
85e6fe83 3459void
eb8433b7 3460#endif
88d95a4d 3461Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *idop, OP *arg)
85e6fe83 3462{
97aff369 3463 dVAR;
a0d0e21e 3464 OP *pack;
a0d0e21e 3465 OP *imop;
b1cb66bf 3466 OP *veop;
eb8433b7
NC		 3467#ifdef PERL_MAD
3468 OP *pegop = newOP(OP_NULL,0);
3469#endif
85e6fe83 3470
88d95a4d 3471 if (idop->op_type != OP_CONST)
cea2e8a9 3472 Perl_croak(aTHX_ "Module name must be constant");
85e6fe83 3473
eb8433b7
NC		 3474 if (PL_madskills)
3475 op_getmad(idop,pegop,'U');
3476
5f66b61c 3477 veop = NULL;
b1cb66bf 3478
aec46f14 3479 if (version) {
551405c4 3480 SV * const vesv = ((SVOP*)version)->op_sv;
b1cb66bf 3481
eb8433b7
NC		 3482 if (PL_madskills)
3483 op_getmad(version,pegop,'V');
aec46f14 3484 if (!arg && !SvNIOKp(vesv)) {
b1cb66bf 3485 arg = version;
3486 }
3487 else {
3488 OP *pack;
0f79a09d 3489 SV *meth;
b1cb66bf 3490
44dcb63b 3491 if (version->op_type != OP_CONST || !SvNIOKp(vesv))
cea2e8a9 3492 Perl_croak(aTHX_ "Version number must be constant number");
b1cb66bf 3493
88d95a4d
JH		 3494 /* Make copy of idop so we don't free it twice */
3495 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
b1cb66bf 3496
3497 /* Fake up a method call to VERSION */
18916d0d 3498 meth = newSVpvs_share("VERSION");
b1cb66bf 3499 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
3500 append_elem(OP_LIST,
0f79a09d
GS		 3501 prepend_elem(OP_LIST, pack, list(version)),
3502 newSVOP(OP_METHOD_NAMED, 0, meth)));
b1cb66bf 3503 }
3504 }
aeea060c 3505
a0d0e21e 3506 /* Fake up an import/unimport */
eb8433b7
NC		 3507 if (arg && arg->op_type == OP_STUB) {
3508 if (PL_madskills)
3509 op_getmad(arg,pegop,'S');
4633a7c4 3510 imop = arg; /* no import on explicit () */
eb8433b7 3511 }
88d95a4d 3512 else if (SvNIOKp(((SVOP*)idop)->op_sv)) {
5f66b61c 3513 imop = NULL; /* use 5.0; */
468aa647
RGS		 3514 if (!aver)
3515 idop->op_private |= OPpCONST_NOVER;
b1cb66bf 3516 }
4633a7c4 3517 else {
0f79a09d
GS		 3518 SV *meth;
3519
eb8433b7
NC		 3520 if (PL_madskills)
3521 op_getmad(arg,pegop,'A');
3522
88d95a4d
JH		 3523 /* Make copy of idop so we don't free it twice */
3524 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
0f79a09d
GS		 3525
3526 /* Fake up a method call to import/unimport */
427d62a4 3527 meth = aver
18916d0d 3528 ? newSVpvs_share("import") : newSVpvs_share("unimport");
4633a7c4 3529 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
0f79a09d
GS		 3530 append_elem(OP_LIST,
3531 prepend_elem(OP_LIST, pack, list(arg)),
3532 newSVOP(OP_METHOD_NAMED, 0, meth)));
4633a7c4
LW		 3533 }
3534
a0d0e21e 3535 /* Fake up the BEGIN {}, which does its thing immediately. */
09bef843 3536 newATTRSUB(floor,
18916d0d 3537 newSVOP(OP_CONST, 0, newSVpvs_share("BEGIN")),
5f66b61c
AL		 3538 NULL,
3539 NULL,
a0d0e21e 3540 append_elem(OP_LINESEQ,
b1cb66bf 3541 append_elem(OP_LINESEQ,
bd61b366
SS		 3542 newSTATEOP(0, NULL, newUNOP(OP_REQUIRE, 0, idop)),
3543 newSTATEOP(0, NULL, veop)),
3544 newSTATEOP(0, NULL, imop) ));
85e6fe83 3545
70f5e4ed
JH		 3546 /* The "did you use incorrect case?" warning used to be here.
3547 * The problem is that on case-insensitive filesystems one
3548 * might get false positives for "use" (and "require"):
3549 * "use Strict" or "require CARP" will work. This causes
3550 * portability problems for the script: in case-strict
3551 * filesystems the script will stop working.
3552 *
3553 * The "incorrect case" warning checked whether "use Foo"
3554 * imported "Foo" to your namespace, but that is wrong, too:
3555 * there is no requirement nor promise in the language that
3556 * a Foo.pm should or would contain anything in package "Foo".
3557 *
3558 * There is very little Configure-wise that can be done, either:
3559 * the case-sensitivity of the build filesystem of Perl does not
3560 * help in guessing the case-sensitivity of the runtime environment.
3561 */
18fc9488 3562
c305c6a0 3563 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 3564 PL_copline = NOLINE;
3565 PL_expect = XSTATE;
8ec8fbef 3566 PL_cop_seqmax++; /* Purely for B::*'s benefit */
eb8433b7
NC		 3567
3568#ifdef PERL_MAD
3569 if (!PL_madskills) {
3570 /* FIXME - don't allocate pegop if !PL_madskills */
3571 op_free(pegop);
1d866c12 3572 return NULL;
eb8433b7
NC		 3573 }
3574 return pegop;
3575#endif
85e6fe83
LW		 3576}
3577
7d3fb230 3578/*
ccfc67b7
JH		 3579=head1 Embedding Functions
3580
7d3fb230
BS		 3581=for apidoc load_module
3582
3583Loads the module whose name is pointed to by the string part of name.
3584Note that the actual module name, not its filename, should be given.
3585Eg, "Foo::Bar" instead of "Foo/Bar.pm". flags can be any of
3586PERL_LOADMOD_DENY, PERL_LOADMOD_NOIMPORT, or PERL_LOADMOD_IMPORT_OPS
3587(or 0 for no flags). ver, if specified, provides version semantics
3588similar to C<use Foo::Bar VERSION>. The optional trailing SV*
3589arguments can be used to specify arguments to the module's import()
3590method, similar to C<use Foo::Bar VERSION LIST>.
3591
3592=cut */
3593
e4783991
GS		 3594void
3595Perl_load_module(pTHX_ U32 flags, SV *name, SV *ver, ...)
3596{
3597 va_list args;
3598 va_start(args, ver);
3599 vload_module(flags, name, ver, &args);
3600 va_end(args);
3601}
3602
3603#ifdef PERL_IMPLICIT_CONTEXT
3604void
3605Perl_load_module_nocontext(U32 flags, SV *name, SV *ver, ...)
3606{
3607 dTHX;
3608 va_list args;
3609 va_start(args, ver);
3610 vload_module(flags, name, ver, &args);
3611 va_end(args);
3612}
3613#endif
3614
3615void
3616Perl_vload_module(pTHX_ U32 flags, SV *name, SV *ver, va_list *args)
3617{
97aff369 3618 dVAR;
551405c4 3619 OP *veop, *imop;
e4783991 3620
551405c4 3621 OP * const modname = newSVOP(OP_CONST, 0, name);
e4783991
GS		 3622 modname->op_private |= OPpCONST_BARE;
3623 if (ver) {
3624 veop = newSVOP(OP_CONST, 0, ver);
3625 }
3626 else
5f66b61c 3627 veop = NULL;
e4783991
GS		 3628 if (flags & PERL_LOADMOD_NOIMPORT) {
3629 imop = sawparens(newNULLLIST());
3630 }
3631 else if (flags & PERL_LOADMOD_IMPORT_OPS) {
3632 imop = va_arg(*args, OP*);
3633 }
3634 else {
3635 SV *sv;
5f66b61c 3636 imop = NULL;
e4783991
GS		 3637 sv = va_arg(*args, SV*);
3638 while (sv) {
3639 imop = append_elem(OP_LIST, imop, newSVOP(OP_CONST, 0, sv));
3640 sv = va_arg(*args, SV*);
3641 }
3642 }
81885997 3643 {
6867be6d
AL		 3644 const line_t ocopline = PL_copline;
3645 COP * const ocurcop = PL_curcop;
3646 const int oexpect = PL_expect;
81885997
GS		 3647
3648 utilize(!(flags & PERL_LOADMOD_DENY), start_subparse(FALSE, 0),
3649 veop, modname, imop);
3650 PL_expect = oexpect;
3651 PL_copline = ocopline;
834a3ffa 3652 PL_curcop = ocurcop;
81885997 3653 }
e4783991
GS		 3654}
3655
79072805 3656OP *
850e8516 3657Perl_dofile(pTHX_ OP *term, I32 force_builtin)
78ca652e 3658{
97aff369 3659 dVAR;
78ca652e 3660 OP *doop;
a0714e2c 3661 GV *gv = NULL;
78ca652e 3662
850e8516 3663 if (!force_builtin) {
fafc274c 3664 gv = gv_fetchpvs("do", GV_NOTQUAL, SVt_PVCV);
850e8516 3665 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv))) {
a4fc7abc 3666 GV * const * const gvp = (GV**)hv_fetchs(PL_globalstash, "do", FALSE);
a0714e2c 3667 gv = gvp ? *gvp : NULL;
850e8516
RGS		 3668 }
3669 }
78ca652e 3670
b9f751c0 3671 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
78ca652e
GS		 3672 doop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
3673 append_elem(OP_LIST, term,
3674 scalar(newUNOP(OP_RV2CV, 0,
d4c19fe8 3675 newGVOP(OP_GV, 0, gv))))));
78ca652e
GS		 3676 }
3677 else {
3678 doop = newUNOP(OP_DOFILE, 0, scalar(term));
3679 }
3680 return doop;
3681}
3682
3683OP *
864dbfa3 3684Perl_newSLICEOP(pTHX_ I32 flags, OP *subscript, OP *listval)
79072805
LW		 3685{
3686 return newBINOP(OP_LSLICE, flags,
8990e307
LW		 3687 list(force_list(subscript)),
3688 list(force_list(listval)) );
79072805
LW		 3689}
3690
76e3520e 3691STATIC I32
504618e9 3692S_is_list_assignment(pTHX_ register const OP *o)
79072805 3693{
1496a290
AL		 3694 unsigned type;
3695 U8 flags;
3696
11343788 3697 if (!o)
79072805
LW		 3698 return TRUE;
3699
1496a290 3700 if ((o->op_type == OP_NULL) && (o->op_flags & OPf_KIDS))
11343788 3701 o = cUNOPo->op_first;
79072805 3702
1496a290
AL		 3703 flags = o->op_flags;
3704 type = o->op_type;
3705 if (type == OP_COND_EXPR) {
504618e9
AL		 3706 const I32 t = is_list_assignment(cLOGOPo->op_first->op_sibling);
3707 const I32 f = is_list_assignment(cLOGOPo->op_first->op_sibling->op_sibling);
79072805
LW		 3708
3709 if (t && f)
3710 return TRUE;
3711 if (t || f)
3712 yyerror("Assignment to both a list and a scalar");
3713 return FALSE;
3714 }
3715
1496a290
AL		 3716 if (type == OP_LIST &&
3717 (flags & OPf_WANT) == OPf_WANT_SCALAR &&
95f0a2f1
SB		 3718 o->op_private & OPpLVAL_INTRO)
3719 return FALSE;
3720
1496a290
AL		 3721 if (type == OP_LIST || flags & OPf_PARENS ||
3722 type == OP_RV2AV || type == OP_RV2HV ||
3723 type == OP_ASLICE || type == OP_HSLICE)
79072805
LW		 3724 return TRUE;
3725
1496a290 3726 if (type == OP_PADAV || type == OP_PADHV)
93a17b20
LW		 3727 return TRUE;
3728
1496a290 3729 if (type == OP_RV2SV)
79072805
LW		 3730 return FALSE;
3731
3732 return FALSE;
3733}
3734
3735OP *
864dbfa3 3736Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
79072805 3737{
97aff369 3738 dVAR;
11343788 3739 OP *o;
79072805 3740
a0d0e21e 3741 if (optype) {
c963b151 3742 if (optype == OP_ANDASSIGN || optype == OP_ORASSIGN || optype == OP_DORASSIGN) {
a0d0e21e
LW		 3743 return newLOGOP(optype, 0,
3744 mod(scalar(left), optype),
3745 newUNOP(OP_SASSIGN, 0, scalar(right)));
3746 }
3747 else {
3748 return newBINOP(optype, OPf_STACKED,
3749 mod(scalar(left), optype), scalar(right));
3750 }
3751 }
3752
504618e9 3753 if (is_list_assignment(left)) {
10c8fecd
GS		 3754 OP *curop;
3755
3280af22 3756 PL_modcount = 0;
dbfe47cf
RD		 3757 /* Grandfathering $[ assignment here. Bletch.*/
3758 /* Only simple assignments like C<< ($[) = 1 >> are allowed */
3759 PL_eval_start = (left->op_type == OP_CONST) ? right : 0;
463ee0b2 3760 left = mod(left, OP_AASSIGN);
3280af22
NIS		 3761 if (PL_eval_start)
3762 PL_eval_start = 0;
dbfe47cf 3763 else if (left->op_type == OP_CONST) {
eb8433b7 3764 /* FIXME for MAD */
dbfe47cf
RD		 3765 /* Result of assignment is always 1 (or we'd be dead already) */
3766 return newSVOP(OP_CONST, 0, newSViv(1));
a0d0e21e 3767 }
10c8fecd
GS		 3768 curop = list(force_list(left));
3769 o = newBINOP(OP_AASSIGN, flags, list(force_list(right)), curop);
eb160463 3770 o->op_private = (U8)(0 | (flags >> 8));
dd2155a4
DM		 3771
3772 /* PL_generation sorcery:
3773 * an assignment like ($a,$b) = ($c,$d) is easier than
3774 * ($a,$b) = ($c,$a), since there is no need for temporary vars.
3775 * To detect whether there are common vars, the global var
3776 * PL_generation is incremented for each assign op we compile.
3777 * Then, while compiling the assign op, we run through all the
3778 * variables on both sides of the assignment, setting a spare slot
3779 * in each of them to PL_generation. If any of them already have
3780 * that value, we know we've got commonality. We could use a
3781 * single bit marker, but then we'd have to make 2 passes, first
3782 * to clear the flag, then to test and set it. To find somewhere
3783 * to store these values, evil chicanery is done with SvCUR().
3784 */
3785
a0d0e21e 3786 if (!(left->op_private & OPpLVAL_INTRO)) {
11343788 3787 OP *lastop = o;
3280af22 3788 PL_generation++;
11343788 3789 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
22c35a8c 3790 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 3791 if (curop->op_type == OP_GV) {
638eceb6 3792 GV *gv = cGVOPx_gv(curop);
169d2d72
NC		 3793 if (gv == PL_defgv
3794 || (int)GvASSIGN_GENERATION(gv) == PL_generation)
79072805 3795 break;
169d2d72 3796 GvASSIGN_GENERATION_set(gv, PL_generation);
79072805 3797 }
748a9306
LW		 3798 else if (curop->op_type == OP_PADSV ||
3799 curop->op_type == OP_PADAV ||
3800 curop->op_type == OP_PADHV ||
dd2155a4
DM		 3801 curop->op_type == OP_PADANY)
3802 {
3803 if (PAD_COMPNAME_GEN(curop->op_targ)
92251a1e 3804 == (STRLEN)PL_generation)
748a9306 3805 break;
b162af07 3806 PAD_COMPNAME_GEN_set(curop->op_targ, PL_generation);
dd2155a4 3807
748a9306 3808 }
79072805
LW		 3809 else if (curop->op_type == OP_RV2CV)
3810 break;
3811 else if (curop->op_type == OP_RV2SV ||
3812 curop->op_type == OP_RV2AV ||
3813 curop->op_type == OP_RV2HV ||
3814 curop->op_type == OP_RV2GV) {
3815 if (lastop->op_type != OP_GV) /* funny deref? */
3816 break;
3817 }
1167e5da
SM		 3818 else if (curop->op_type == OP_PUSHRE) {
3819 if (((PMOP*)curop)->op_pmreplroot) {
b3f5893f 3820#ifdef USE_ITHREADS
dd2155a4
DM		 3821 GV *gv = (GV*)PAD_SVl(INT2PTR(PADOFFSET,
3822 ((PMOP*)curop)->op_pmreplroot));
b3f5893f 3823#else
1167e5da 3824 GV *gv = (GV*)((PMOP*)curop)->op_pmreplroot;
b3f5893f 3825#endif
169d2d72
NC		 3826 if (gv == PL_defgv
3827 || (int)GvASSIGN_GENERATION(gv) == PL_generation)
1167e5da 3828 break;
169d2d72
NC		 3829 GvASSIGN_GENERATION_set(gv, PL_generation);
3830 GvASSIGN_GENERATION_set(gv, PL_generation);
b2ffa427 3831 }
1167e5da 3832 }
79072805
LW		 3833 else
3834 break;
3835 }
3836 lastop = curop;
3837 }
11343788 3838 if (curop != o)
10c8fecd 3839 o->op_private |= OPpASSIGN_COMMON;
79072805 3840 }
c07a80fd 3841 if (right && right->op_type == OP_SPLIT) {
1496a290
AL		 3842 OP* tmpop = ((LISTOP*)right)->op_first;
3843 if (tmpop && (tmpop->op_type == OP_PUSHRE)) {
551405c4 3844 PMOP * const pm = (PMOP*)tmpop;
c07a80fd 3845 if (left->op_type == OP_RV2AV &&
3846 !(left->op_private & OPpLVAL_INTRO) &&
11343788 3847 !(o->op_private & OPpASSIGN_COMMON) )
c07a80fd 3848 {
3849 tmpop = ((UNOP*)left)->op_first;
3850 if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
971a9dd3 3851#ifdef USE_ITHREADS
ba89bb6e 3852 pm->op_pmreplroot = INT2PTR(OP*, cPADOPx(tmpop)->op_padix);
971a9dd3
GS		 3853 cPADOPx(tmpop)->op_padix = 0; /* steal it */
3854#else
3855 pm->op_pmreplroot = (OP*)cSVOPx(tmpop)->op_sv;
a0714e2c 3856 cSVOPx(tmpop)->op_sv = NULL; /* steal it */
971a9dd3 3857#endif
c07a80fd 3858 pm->op_pmflags |= PMf_ONCE;
11343788 3859 tmpop = cUNOPo->op_first; /* to list (nulled) */
c07a80fd 3860 tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
5f66b61c 3861 tmpop->op_sibling = NULL; /* don't free split */
c07a80fd 3862 right->op_next = tmpop->op_next; /* fix starting loc */
eb8433b7
NC		 3863#ifdef PERL_MAD
3864 op_getmad(o,right,'R'); /* blow off assign */
3865#else
11343788 3866 op_free(o); /* blow off assign */
eb8433b7 3867#endif
54310121 3868 right->op_flags &= ~OPf_WANT;
a5f75d66 3869 /* "I don't know and I don't care." */
c07a80fd 3870 return right;
3871 }
3872 }
3873 else {
e6438c1a 3874 if (PL_modcount < RETURN_UNLIMITED_NUMBER &&
c07a80fd 3875 ((LISTOP*)right)->op_last->op_type == OP_CONST)
3876 {
3877 SV *sv = ((SVOP*)((LISTOP*)right)->op_last)->op_sv;
3878 if (SvIVX(sv) == 0)
3280af22 3879 sv_setiv(sv, PL_modcount+1);
c07a80fd 3880 }
3881 }
3882 }
3883 }
11343788 3884 return o;
79072805
LW		 3885 }
3886 if (!right)
3887 right = newOP(OP_UNDEF, 0);
3888 if (right->op_type == OP_READLINE) {
3889 right->op_flags |= OPf_STACKED;
463ee0b2 3890 return newBINOP(OP_NULL, flags, mod(scalar(left), OP_SASSIGN), scalar(right));
79072805 3891 }
a0d0e21e 3892 else {
3280af22 3893 PL_eval_start = right; /* Grandfathering $[ assignment here. Bletch.*/
11343788 3894 o = newBINOP(OP_SASSIGN, flags,
463ee0b2 3895 scalar(right), mod(scalar(left), OP_SASSIGN) );
3280af22
NIS		 3896 if (PL_eval_start)
3897 PL_eval_start = 0;
748a9306 3898 else {
eb8433b7 3899 /* FIXME for MAD */
3b6547f5 3900 op_free(o);
fc15ae8f 3901 o = newSVOP(OP_CONST, 0, newSViv(CopARYBASE_get(&PL_compiling)));
2e0ae2d3 3902 o->op_private |= OPpCONST_ARYBASE;
a0d0e21e
LW		 3903 }
3904 }
11343788 3905 return o;
79072805
LW		 3906}
3907
3908OP *
864dbfa3 3909Perl_newSTATEOP(pTHX_ I32 flags, char *label, OP *o)
79072805 3910{
27da23d5 3911 dVAR;
e1ec3a88 3912 const U32 seq = intro_my();
79072805
LW		 3913 register COP *cop;
3914
b7dc083c 3915 NewOp(1101, cop, 1, COP);
57843af0 3916 if (PERLDB_LINE && CopLINE(PL_curcop) && PL_curstash != PL_debstash) {
8990e307 3917 cop->op_type = OP_DBSTATE;
22c35a8c 3918 cop->op_ppaddr = PL_ppaddr[ OP_DBSTATE ];
8990e307
LW		 3919 }
3920 else {
3921 cop->op_type = OP_NEXTSTATE;
22c35a8c 3922 cop->op_ppaddr = PL_ppaddr[ OP_NEXTSTATE ];
8990e307 3923 }
eb160463 3924 cop->op_flags = (U8)flags;
623e6609 3925 CopHINTS_set(cop, PL_hints);
ff0cee69 3926#ifdef NATIVE_HINTS
3927 cop->op_private |= NATIVE_HINTS;
3928#endif
623e6609 3929 CopHINTS_set(&PL_compiling, CopHINTS_get(cop));
79072805
LW		 3930 cop->op_next = (OP*)cop;
3931
463ee0b2
LW		 3932 if (label) {
3933 cop->cop_label = label;
3280af22 3934 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 3935 }
bbce6d69 3936 cop->cop_seq = seq;
7b0bddfa 3937 /* CopARYBASE is now "virtual", in that it's stored as a flag bit in
c28fe1ec
NC		 3938 CopHINTS and a possible value in cop_hints_hash, so no need to copy it.
3939 */
72dc9ed5 3940 cop->cop_warnings = DUP_WARNINGS(PL_curcop->cop_warnings);
c28fe1ec
NC		 3941 cop->cop_hints_hash = PL_curcop->cop_hints_hash;
3942 if (cop->cop_hints_hash) {
cbb1fbea 3943 HINTS_REFCNT_LOCK;
c28fe1ec 3944 cop->cop_hints_hash->refcounted_he_refcnt++;
cbb1fbea 3945 HINTS_REFCNT_UNLOCK;
b3ca2e83 3946 }
79072805 3947
3280af22 3948 if (PL_copline == NOLINE)
57843af0 3949 CopLINE_set(cop, CopLINE(PL_curcop));
79072805 3950 else {
57843af0 3951 CopLINE_set(cop, PL_copline);
3280af22 3952 PL_copline = NOLINE;
79072805 3953 }
57843af0 3954#ifdef USE_ITHREADS
f4dd75d9 3955 CopFILE_set(cop, CopFILE(PL_curcop)); /* XXX share in a pvtable? */
57843af0 3956#else
f4dd75d9 3957 CopFILEGV_set(cop, CopFILEGV(PL_curcop));
57843af0 3958#endif
11faa288 3959 CopSTASH_set(cop, PL_curstash);
79072805 3960
3280af22 3961 if (PERLDB_LINE && PL_curstash != PL_debstash) {
fe8247eb 3962 SV * const * const svp = av_fetch(CopFILEAVx(PL_curcop), (I32)CopLINE(cop), FALSE);
2d03de9c
AL		 3963 if (svp && *svp != &PL_sv_undef ) {
3964 (void)SvIOK_on(*svp);
45977657 3965 SvIV_set(*svp, PTR2IV(cop));
1eb1540c 3966 }
93a17b20
LW		 3967 }
3968
722969e2 3969 return prepend_elem(OP_LINESEQ, (OP*)cop, o);
79072805
LW		 3970}
3971
bbce6d69 3972
79072805 3973OP *
864dbfa3 3974Perl_newLOGOP(pTHX_ I32 type, I32 flags, OP *first, OP *other)
79072805 3975{
27da23d5 3976 dVAR;
883ffac3
CS		 3977 return new_logop(type, flags, &first, &other);
3978}
3979
3bd495df 3980STATIC OP *
cea2e8a9 3981S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
883ffac3 3982{
27da23d5 3983 dVAR;
79072805 3984 LOGOP *logop;
11343788 3985 OP *o;
883ffac3 3986 OP *first = *firstp;
b22e6366 3987 OP * const other = *otherp;
79072805 3988
a0d0e21e
LW		 3989 if (type == OP_XOR) /* Not short circuit, but here by precedence. */
3990 return newBINOP(type, flags, scalar(first), scalar(other));
3991
8990e307 3992 scalarboolean(first);
79072805 3993 /* optimize "!a && b" to "a || b", and "!a || b" to "a && b" */
68726e16
NC		 3994 if (first->op_type == OP_NOT
3995 && (first->op_flags & OPf_SPECIAL)
3996 && (first->op_flags & OPf_KIDS)) {
79072805
LW		 3997 if (type == OP_AND || type == OP_OR) {
3998 if (type == OP_AND)
3999 type = OP_OR;
4000 else
4001 type = OP_AND;
11343788 4002 o = first;
883ffac3 4003 first = *firstp = cUNOPo->op_first;
11343788
MB		 4004 if (o->op_next)
4005 first->op_next = o->op_next;
5f66b61c 4006 cUNOPo->op_first = NULL;
eb8433b7
NC		 4007#ifdef PERL_MAD
4008 op_getmad(o,first,'O');
4009#else
11343788 4010 op_free(o);
eb8433b7 4011#endif
79072805
LW		 4012 }
4013 }
4014 if (first->op_type == OP_CONST) {
39a440a3
DM		 4015 if (first->op_private & OPpCONST_STRICT)
4016 no_bareword_allowed(first);
041457d9 4017 else if ((first->op_private & OPpCONST_BARE) && ckWARN(WARN_BAREWORD))
989dfb19 4018 Perl_warner(aTHX_ packWARN(WARN_BAREWORD), "Bareword found in conditional");
75cc09e4
MHM		 4019 if ((type == OP_AND && SvTRUE(((SVOP*)first)->op_sv)) ||
4020 (type == OP_OR && !SvTRUE(((SVOP*)first)->op_sv)) ||
4021 (type == OP_DOR && !SvOK(((SVOP*)first)->op_sv))) {
5f66b61c 4022 *firstp = NULL;
d6fee5c7
DM		 4023 if (other->op_type == OP_CONST)
4024 other->op_private |= OPpCONST_SHORTCIRCUIT;
eb8433b7
NC		 4025 if (PL_madskills) {
4026 OP *newop = newUNOP(OP_NULL, 0, other);
4027 op_getmad(first, newop, '1');
4028 newop->op_targ = type; /* set "was" field */
4029 return newop;
4030 }
4031 op_free(first);
79072805
LW		 4032 return other;
4033 }
4034 else {
7921d0f2 4035 /* check for C<my $x if 0>, or C<my($x,$y) if 0> */
6867be6d 4036 const OP *o2 = other;
7921d0f2
DM		 4037 if ( ! (o2->op_type == OP_LIST
4038 && (( o2 = cUNOPx(o2)->op_first))
4039 && o2->op_type == OP_PUSHMARK
4040 && (( o2 = o2->op_sibling)) )
4041 )
4042 o2 = other;
4043 if ((o2->op_type == OP_PADSV || o2->op_type == OP_PADAV
4044 || o2->op_type == OP_PADHV)
4045 && o2->op_private & OPpLVAL_INTRO
4046 && ckWARN(WARN_DEPRECATED))
4047 {
4048 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
4049 "Deprecated use of my() in false conditional");
4050 }
4051
5f66b61c 4052 *otherp = NULL;
d6fee5c7
DM		 4053 if (first->op_type == OP_CONST)
4054 first->op_private |= OPpCONST_SHORTCIRCUIT;
eb8433b7
NC		 4055 if (PL_madskills) {
4056 first = newUNOP(OP_NULL, 0, first);
4057 op_getmad(other, first, '2');
4058 first->op_targ = type; /* set "was" field */
4059 }
4060 else
4061 op_free(other);
79072805
LW		 4062 return first;
4063 }
4064 }
041457d9
DM		 4065 else if ((first->op_flags & OPf_KIDS) && type != OP_DOR
4066 && ckWARN(WARN_MISC)) /* [#24076] Don't warn for <FH> err FOO. */
59e10468 4067 {
b22e6366
AL		 4068 const OP * const k1 = ((UNOP*)first)->op_first;
4069 const OP * const k2 = k1->op_sibling;
a6006777 4070 OPCODE warnop = 0;
4071 switch (first->op_type)
4072 {
4073 case OP_NULL:
4074 if (k2 && k2->op_type == OP_READLINE
4075 && (k2->op_flags & OPf_STACKED)
1c846c1f 4076 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
72b16652 4077 {
a6006777 4078 warnop = k2->op_type;
72b16652 4079 }
a6006777 4080 break;
4081
4082 case OP_SASSIGN:
68dc0745 4083 if (k1->op_type == OP_READDIR
4084 || k1->op_type == OP_GLOB
72b16652 4085 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
68dc0745 4086 || k1->op_type == OP_EACH)
72b16652
GS		 4087 {
4088 warnop = ((k1->op_type == OP_NULL)
eb160463 4089 ? (OPCODE)k1->op_targ : k1->op_type);
72b16652 4090 }
a6006777 4091 break;
4092 }
8ebc5c01 4093 if (warnop) {
6867be6d 4094 const line_t oldline = CopLINE(PL_curcop);
57843af0 4095 CopLINE_set(PL_curcop, PL_copline);
9014280d 4096 Perl_warner(aTHX_ packWARN(WARN_MISC),
599cee73 4097 "Value of %s%s can be \"0\"; test with defined()",
22c35a8c 4098 PL_op_desc[warnop],
68dc0745 4099 ((warnop == OP_READLINE || warnop == OP_GLOB)
4100 ? " construct" : "() operator"));
57843af0 4101 CopLINE_set(PL_curcop, oldline);
8ebc5c01 4102 }
a6006777 4103 }
79072805
LW		 4104
4105 if (!other)
4106 return first;
4107
c963b151 4108 if (type == OP_ANDASSIGN || type == OP_ORASSIGN || type == OP_DORASSIGN)
a0d0e21e
LW		 4109 other->op_private |= OPpASSIGN_BACKWARDS; /* other is an OP_SASSIGN */
4110
b7dc083c 4111 NewOp(1101, logop, 1, LOGOP);
79072805 4112
eb160463 4113 logop->op_type = (OPCODE)type;
22c35a8c 4114 logop->op_ppaddr = PL_ppaddr[type];
79072805 4115 logop->op_first = first;
585ec06d 4116 logop->op_flags = (U8)(flags | OPf_KIDS);
79072805 4117 logop->op_other = LINKLIST(other);
eb160463 4118 logop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 4119
4120 /* establish postfix order */
4121 logop->op_next = LINKLIST(first);
4122 first->op_next = (OP*)logop;
4123 first->op_sibling = other;
4124
463d09e6
RGS		 4125 CHECKOP(type,logop);
4126
11343788
MB		 4127 o = newUNOP(OP_NULL, 0, (OP*)logop);
4128 other->op_next = o;
79072805 4129
11343788 4130 return o;
79072805
LW		 4131}
4132
4133OP *
864dbfa3 4134Perl_newCONDOP(pTHX_ I32 flags, OP *first, OP *trueop, OP *falseop)
79072805 4135{
27da23d5 4136 dVAR;
1a67a97c
SM		 4137 LOGOP *logop;
4138 OP *start;
11343788 4139 OP *o;
79072805 4140
b1cb66bf 4141 if (!falseop)
4142 return newLOGOP(OP_AND, 0, first, trueop);
4143 if (!trueop)
4144 return newLOGOP(OP_OR, 0, first, falseop);
79072805 4145
8990e307 4146 scalarboolean(first);
79072805 4147 if (first->op_type == OP_CONST) {
2bc6235c 4148 if (first->op_private & OPpCONST_BARE &&
b22e6366
AL		 4149 first->op_private & OPpCONST_STRICT) {
4150 no_bareword_allowed(first);
4151 }
79072805 4152 if (SvTRUE(((SVOP*)first)->op_sv)) {
eb8433b7
NC		 4153#ifdef PERL_MAD
4154 if (PL_madskills) {
4155 trueop = newUNOP(OP_NULL, 0, trueop);
4156 op_getmad(first,trueop,'C');
4157 op_getmad(falseop,trueop,'e');
4158 }
4159 /* FIXME for MAD - should there be an ELSE here? */
4160#else
79072805 4161 op_free(first);
b1cb66bf 4162 op_free(falseop);
eb8433b7 4163#endif
b1cb66bf 4164 return trueop;
79072805
LW		 4165 }
4166 else {
eb8433b7
NC		 4167#ifdef PERL_MAD
4168 if (PL_madskills) {
4169 falseop = newUNOP(OP_NULL, 0, falseop);
4170 op_getmad(first,falseop,'C');
4171 op_getmad(trueop,falseop,'t');
4172 }
4173 /* FIXME for MAD - should there be an ELSE here? */
4174#else
79072805 4175 op_free(first);
b1cb66bf 4176 op_free(trueop);
eb8433b7 4177#endif
b1cb66bf 4178 return falseop;
79072805
LW		 4179 }
4180 }
1a67a97c
SM		 4181 NewOp(1101, logop, 1, LOGOP);
4182 logop->op_type = OP_COND_EXPR;
4183 logop->op_ppaddr = PL_ppaddr[OP_COND_EXPR];
4184 logop->op_first = first;
585ec06d 4185 logop->op_flags = (U8)(flags | OPf_KIDS);
eb160463 4186 logop->op_private = (U8)(1 | (flags >> 8));
1a67a97c
SM		 4187 logop->op_other = LINKLIST(trueop);
4188 logop->op_next = LINKLIST(falseop);
79072805 4189
463d09e6
RGS		 4190 CHECKOP(OP_COND_EXPR, /* that's logop->op_type */
4191 logop);
79072805
LW		 4192
4193 /* establish postfix order */
1a67a97c
SM		 4194 start = LINKLIST(first);
4195 first->op_next = (OP*)logop;
79072805 4196
b1cb66bf 4197 first->op_sibling = trueop;
4198 trueop->op_sibling = falseop;
1a67a97c 4199 o = newUNOP(OP_NULL, 0, (OP*)logop);
79072805 4200
1a67a97c 4201 trueop->op_next = falseop->op_next = o;
79072805 4202
1a67a97c 4203 o->op_next = start;
11343788 4204 return o;
79072805
LW		 4205}
4206
4207OP *
864dbfa3 4208Perl_newRANGE(pTHX_ I32 flags, OP *left, OP *right)
79072805 4209{
27da23d5 4210 dVAR;
1a67a97c 4211 LOGOP *range;
79072805
LW		 4212 OP *flip;
4213 OP *flop;
1a67a97c 4214 OP *leftstart;
11343788 4215 OP *o;
79072805 4216
1a67a97c 4217 NewOp(1101, range, 1, LOGOP);
79072805 4218
1a67a97c
SM		 4219 range->op_type = OP_RANGE;
4220 range->op_ppaddr = PL_ppaddr[OP_RANGE];
4221 range->op_first = left;
4222 range->op_flags = OPf_KIDS;
4223 leftstart = LINKLIST(left);
4224 range->op_other = LINKLIST(right);
eb160463 4225 range->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 4226
4227 left->op_sibling = right;
4228
1a67a97c
SM		 4229 range->op_next = (OP*)range;
4230 flip = newUNOP(OP_FLIP, flags, (OP*)range);
79072805 4231 flop = newUNOP(OP_FLOP, 0, flip);
11343788 4232 o = newUNOP(OP_NULL, 0, flop);
79072805 4233 linklist(flop);
1a67a97c 4234 range->op_next = leftstart;
79072805
LW		 4235
4236 left->op_next = flip;
4237 right->op_next = flop;
4238
1a67a97c
SM		 4239 range->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
4240 sv_upgrade(PAD_SV(range->op_targ), SVt_PVNV);
ed6116ce 4241 flip->op_targ = pad_alloc(OP_RANGE, SVs_PADMY);
79072805
LW		 4242 sv_upgrade(PAD_SV(flip->op_targ), SVt_PVNV);
4243
4244 flip->op_private = left->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
4245 flop->op_private = right->op_type == OP_CONST ? OPpFLIP_LINENUM : 0;
4246
11343788 4247 flip->op_next = o;
79072805 4248 if (!flip->op_private || !flop->op_private)
11343788 4249 linklist(o); /* blow off optimizer unless constant */
79072805 4250
11343788 4251 return o;
79072805
LW		 4252}
4253
4254OP *
864dbfa3 4255Perl_newLOOPOP(pTHX_ I32 flags, I32 debuggable, OP *expr, OP *block)
79072805 4256{
97aff369 4257 dVAR;
463ee0b2 4258 OP* listop;
11343788 4259 OP* o;
73d840c0 4260 const bool once = block && block->op_flags & OPf_SPECIAL &&
a0d0e21e 4261 (block->op_type == OP_ENTERSUB || block->op_type == OP_NULL);
46c461b5
AL		 4262
4263 PERL_UNUSED_ARG(debuggable);
93a17b20 4264
463ee0b2
LW		 4265 if (expr) {
4266 if (once && expr->op_type == OP_CONST && !SvTRUE(((SVOP*)expr)->op_sv))
4267 return block; /* do {} while 0 does once */
fb73857a 4268 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
4269 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
774d564b 4270 expr = newUNOP(OP_DEFINED, 0,
54b9620d 4271 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
55d729e4 4272 } else if (expr->op_flags & OPf_KIDS) {
46c461b5
AL		 4273 const OP * const k1 = ((UNOP*)expr)->op_first;
4274 const OP * const k2 = k1 ? k1->op_sibling : NULL;
55d729e4 4275 switch (expr->op_type) {
1c846c1f 4276 case OP_NULL:
55d729e4
GS		 4277 if (k2 && k2->op_type == OP_READLINE
4278 && (k2->op_flags & OPf_STACKED)
1c846c1f 4279 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
55d729e4 4280 expr = newUNOP(OP_DEFINED, 0, expr);
1c846c1f 4281 break;
55d729e4
GS		 4282
4283 case OP_SASSIGN:
06dc7ac6 4284 if (k1 && (k1->op_type == OP_READDIR
55d729e4 4285 || k1->op_type == OP_GLOB
6531c3e6 4286 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
06dc7ac6 4287 || k1->op_type == OP_EACH))
55d729e4
GS		 4288 expr = newUNOP(OP_DEFINED, 0, expr);
4289 break;
4290 }
774d564b 4291 }
463ee0b2 4292 }
93a17b20 4293
e1548254
RGS		 4294 /* if block is null, the next append_elem() would put UNSTACK, a scalar
4295 * op, in listop. This is wrong. [perl #27024] */
4296 if (!block)
4297 block = newOP(OP_NULL, 0);
8990e307 4298 listop = append_elem(OP_LINESEQ, block, newOP(OP_UNSTACK, 0));
883ffac3 4299 o = new_logop(OP_AND, 0, &expr, &listop);
463ee0b2 4300
883ffac3
CS		 4301 if (listop)
4302 ((LISTOP*)listop)->op_last->op_next = LINKLIST(o);
79072805 4303
11343788
MB		 4304 if (once && o != listop)
4305 o->op_next = ((LOGOP*)cUNOPo->op_first)->op_other;
79072805 4306
11343788
MB		 4307 if (o == listop)
4308 o = newUNOP(OP_NULL, 0, o); /* or do {} while 1 loses outer block */
748a9306 4309
11343788
MB		 4310 o->op_flags |= flags;
4311 o = scope(o);
4312 o->op_flags |= OPf_SPECIAL; /* suppress POPBLOCK curpm restoration*/
4313 return o;
79072805
LW		 4314}
4315
4316OP *
a034e688
DM		 4317Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32
4318whileline, OP *expr, OP *block, OP *cont, I32 has_my)
79072805 4319{
27da23d5 4320 dVAR;
79072805 4321 OP *redo;
c445ea15 4322 OP *next = NULL;
79072805 4323 OP *listop;
11343788 4324 OP *o;
1ba6ee2b 4325 U8 loopflags = 0;
46c461b5
AL		 4326
4327 PERL_UNUSED_ARG(debuggable);
79072805 4328
2d03de9c
AL		 4329 if (expr) {
4330 if (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
4331 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB)) {
4332 expr = newUNOP(OP_DEFINED, 0,
4333 newASSIGNOP(0, newDEFSVOP(), 0, expr) );
4334 } else if (expr->op_flags & OPf_KIDS) {
4335 const OP * const k1 = ((UNOP*)expr)->op_first;
4336 const OP * const k2 = (k1) ? k1->op_sibling : NULL;
4337 switch (expr->op_type) {
4338 case OP_NULL:
4339 if (k2 && k2->op_type == OP_READLINE
4340 && (k2->op_flags & OPf_STACKED)
4341 && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR))
4342 expr = newUNOP(OP_DEFINED, 0, expr);
4343 break;
55d729e4 4344
2d03de9c 4345 case OP_SASSIGN:
72c8de1a 4346 if (k1 && (k1->op_type == OP_READDIR
2d03de9c
AL		 4347 || k1->op_type == OP_GLOB
4348 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
72c8de1a 4349 || k1->op_type == OP_EACH))
2d03de9c
AL		 4350 expr = newUNOP(OP_DEFINED, 0, expr);
4351 break;
4352 }
55d729e4 4353 }
748a9306 4354 }
79072805
LW		 4355
4356 if (!block)
4357 block = newOP(OP_NULL, 0);
a034e688 4358 else if (cont || has_my) {
87246558
GS		 4359 block = scope(block);
4360 }
79072805 4361
1ba6ee2b 4362 if (cont) {
79072805 4363 next = LINKLIST(cont);
1ba6ee2b 4364 }
fb73857a 4365 if (expr) {
551405c4 4366 OP * const unstack = newOP(OP_UNSTACK, 0);
85538317
GS		 4367 if (!next)
4368 next = unstack;
4369 cont = append_elem(OP_LINESEQ, cont, unstack);
fb73857a 4370 }
79072805 4371
ce3e5c45 4372 assert(block);
463ee0b2 4373 listop = append_list(OP_LINESEQ, (LISTOP*)block, (LISTOP*)cont);
ce3e5c45 4374 assert(listop);
79072805
LW		 4375 redo = LINKLIST(listop);
4376
4377 if (expr) {
eb160463 4378 PL_copline = (line_t)whileline;
883ffac3
CS		 4379 scalar(listop);
4380 o = new_logop(OP_AND, 0, &expr, &listop);
11343788 4381 if (o == expr && o->op_type == OP_CONST && !SvTRUE(cSVOPo->op_sv)) {
85e6fe83 4382 op_free(expr); /* oops, it's a while (0) */
463ee0b2 4383 op_free((OP*)loop);
5f66b61c 4384 return NULL; /* listop already freed by new_logop */
463ee0b2 4385 }
883ffac3 4386 if (listop)
497b47a8 4387 ((LISTOP*)listop)->op_last->op_next =
883ffac3 4388 (o == listop ? redo : LINKLIST(o));
79072805
LW		 4389 }
4390 else
11343788 4391 o = listop;
79072805
LW		 4392
4393 if (!loop) {
b7dc083c 4394 NewOp(1101,loop,1,LOOP);
79072805 4395 loop->op_type = OP_ENTERLOOP;
22c35a8c 4396 loop->op_ppaddr = PL_ppaddr[OP_ENTERLOOP];
79072805
LW		 4397 loop->op_private = 0;
4398 loop->op_next = (OP*)loop;
4399 }
4400
11343788 4401 o = newBINOP(OP_LEAVELOOP, 0, (OP*)loop, o);
79072805
LW		 4402
4403 loop->op_redoop = redo;
11343788 4404 loop->op_lastop = o;
1ba6ee2b 4405 o->op_private |= loopflags;
79072805
LW		 4406
4407 if (next)
4408 loop->op_nextop = next;
4409 else
11343788 4410 loop->op_nextop = o;
79072805 4411
11343788
MB		 4412 o->op_flags |= flags;
4413 o->op_private |= (flags >> 8);
4414 return o;
79072805
LW		 4415}
4416
4417OP *
66a1b24b 4418Perl_newFOROP(pTHX_ I32 flags, char *label, line_t forline, OP *sv, OP *expr, OP *block, OP *cont)
79072805 4419{
27da23d5 4420 dVAR;
79072805 4421 LOOP *loop;
fb73857a 4422 OP *wop;
4bbc6d12 4423 PADOFFSET padoff = 0;
4633a7c4 4424 I32 iterflags = 0;
241416b8 4425 I32 iterpflags = 0;
d4c19fe8 4426 OP *madsv = NULL;
79072805 4427
79072805 4428 if (sv) {
85e6fe83 4429 if (sv->op_type == OP_RV2SV) { /* symbol table variable */
241416b8 4430 iterpflags = sv->op_private & OPpOUR_INTRO; /* for our $x () */
748a9306 4431 sv->op_type = OP_RV2GV;
22c35a8c 4432 sv->op_ppaddr = PL_ppaddr[OP_RV2GV];
0d863452
RH		 4433 if (cGVOPx_gv(cUNOPx(sv)->op_first) == PL_defgv)
4434 iterpflags |= OPpITER_DEF;
79072805 4435 }
85e6fe83 4436 else if (sv->op_type == OP_PADSV) { /* private variable */
241416b8 4437 iterpflags = sv->op_private & OPpLVAL_INTRO; /* for my $x () */
85e6fe83 4438 padoff = sv->op_targ;
eb8433b7
NC		 4439 if (PL_madskills)
4440 madsv = sv;
4441 else {
4442 sv->op_targ = 0;
4443 op_free(sv);
4444 }
5f66b61c 4445 sv = NULL;
85e6fe83 4446 }
54b9620d
MB		 4447 else if (sv->op_type == OP_THREADSV) { /* per-thread variable */
4448 padoff = sv->op_targ;
eb8433b7
NC		 4449 if (PL_madskills)
4450 madsv = sv;
4451 else {
4452 sv->op_targ = 0;
4453 iterflags |= OPf_SPECIAL;
4454 op_free(sv);
4455 }
5f66b61c 4456 sv = NULL;
54b9620d 4457 }
79072805 4458 else
cea2e8a9 4459 Perl_croak(aTHX_ "Can't use %s for loop variable", PL_op_desc[sv->op_type]);
0d863452
RH		 4460 if (padoff && strEQ(PAD_COMPNAME_PV(padoff), "$_"))
4461 iterpflags |= OPpITER_DEF;
79072805
LW		 4462 }
4463 else {
9f7d9405 4464 const PADOFFSET offset = pad_findmy("$_");
00b1698f 4465 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS_isOUR(offset)) {
aabe9514
RGS		 4466 sv = newGVOP(OP_GV, 0, PL_defgv);
4467 }
4468 else {
4469 padoff = offset;
aabe9514 4470 }
0d863452 4471 iterpflags |= OPpITER_DEF;
79072805 4472 }
5f05dabc 4473 if (expr->op_type == OP_RV2AV || expr->op_type == OP_PADAV) {
89ea2908 4474 expr = mod(force_list(scalar(ref(expr, OP_ITER))), OP_GREPSTART);
4633a7c4
LW		 4475 iterflags |= OPf_STACKED;
4476 }
89ea2908
GA		 4477 else if (expr->op_type == OP_NULL &&
4478 (expr->op_flags & OPf_KIDS) &&
4479 ((BINOP*)expr)->op_first->op_type == OP_FLOP)
4480 {
4481 /* Basically turn for($x..$y) into the same as for($x,$y), but we
4482 * set the STACKED flag to indicate that these values are to be
4483 * treated as min/max values by 'pp_iterinit'.
4484 */
d4c19fe8 4485 const UNOP* const flip = (UNOP*)((UNOP*)((BINOP*)expr)->op_first)->op_first;
551405c4 4486 LOGOP* const range = (LOGOP*) flip->op_first;
66a1b24b
AL		 4487 OP* const left = range->op_first;
4488 OP* const right = left->op_sibling;
5152d7c7 4489 LISTOP* listop;
89ea2908
GA		 4490
4491 range->op_flags &= ~OPf_KIDS;
5f66b61c 4492 range->op_first = NULL;
89ea2908 4493
5152d7c7 4494 listop = (LISTOP*)newLISTOP(OP_LIST, 0, left, right);
1a67a97c
SM		 4495 listop->op_first->op_next = range->op_next;
4496 left->op_next = range->op_other;
5152d7c7
GS		 4497 right->op_next = (OP*)listop;
4498 listop->op_next = listop->op_first;
89ea2908 4499
eb8433b7
NC		 4500#ifdef PERL_MAD
4501 op_getmad(expr,(OP*)listop,'O');
4502#else
89ea2908 4503 op_free(expr);
eb8433b7 4504#endif
5152d7c7 4505 expr = (OP*)(listop);
93c66552 4506 op_null(expr);
89ea2908
GA		 4507 iterflags |= OPf_STACKED;
4508 }
4509 else {
4510 expr = mod(force_list(expr), OP_GREPSTART);
4511 }
4512
4633a7c4 4513 loop = (LOOP*)list(convert(OP_ENTERITER, iterflags,
89ea2908 4514 append_elem(OP_LIST, expr, scalar(sv))));
85e6fe83 4515 assert(!loop->op_next);
241416b8 4516 /* for my $x () sets OPpLVAL_INTRO;
14f338dc 4517 * for our $x () sets OPpOUR_INTRO */
c5661c80 4518 loop->op_private = (U8)iterpflags;
b7dc083c 4519#ifdef PL_OP_SLAB_ALLOC
155aba94
GS		 4520 {
4521 LOOP *tmp;
4522 NewOp(1234,tmp,1,LOOP);
bd5f3bc4 4523 Copy(loop,tmp,1,LISTOP);
238a4c30 4524 FreeOp(loop);
155aba94
GS		 4525 loop = tmp;
4526 }
b7dc083c 4527#else
04e62e51 4528 loop = PerlMemShared_realloc(loop, sizeof(LOOP));
1c846c1f 4529#endif
85e6fe83 4530 loop->op_targ = padoff;
a034e688 4531 wop = newWHILEOP(flags, 1, loop, forline, newOP(OP_ITER, 0), block, cont, 0);
eb8433b7
NC		 4532 if (madsv)
4533 op_getmad(madsv, (OP*)loop, 'v');
3280af22 4534 PL_copline = forline;
fb73857a 4535 return newSTATEOP(0, label, wop);
79072805
LW		 4536}
4537
8990e307 4538OP*
864dbfa3 4539Perl_newLOOPEX(pTHX_ I32 type, OP *label)
8990e307 4540{
97aff369 4541 dVAR;
11343788 4542 OP *o;
2d8e6c8d 4543
8990e307 4544 if (type != OP_GOTO || label->op_type == OP_CONST) {
cdaebead
MB		 4545 /* "last()" means "last" */
4546 if (label->op_type == OP_STUB && (label->op_flags & OPf_PARENS))
4547 o = newOP(type, OPf_SPECIAL);
4548 else {
4549 o = newPVOP(type, 0, savepv(label->op_type == OP_CONST
8b6b16e7 4550 ? SvPVx_nolen_const(((SVOP*)label)->op_sv)
cdaebead
MB		 4551 : ""));
4552 }
eb8433b7
NC		 4553#ifdef PERL_MAD
4554 op_getmad(label,o,'L');
4555#else
8990e307 4556 op_free(label);
eb8433b7 4557#endif
8990e307
LW		 4558 }
4559 else {
e3aba57a
RGS		 4560 /* Check whether it's going to be a goto &function */
4561 if (label->op_type == OP_ENTERSUB
4562 && !(label->op_flags & OPf_STACKED))
a0d0e21e 4563 label = newUNOP(OP_REFGEN, 0, mod(label, OP_REFGEN));
11343788 4564 o = newUNOP(type, OPf_STACKED, label);
8990e307 4565 }
3280af22 4566 PL_hints |= HINT_BLOCK_SCOPE;
11343788 4567 return o;
8990e307
LW		 4568}
4569
0d863452
RH		 4570/* if the condition is a literal array or hash
4571 (or @{ ... } etc), make a reference to it.
4572 */
4573STATIC OP *
4574S_ref_array_or_hash(pTHX_ OP *cond)
4575{
4576 if (cond
4577 && (cond->op_type == OP_RV2AV
4578 || cond->op_type == OP_PADAV
4579 || cond->op_type == OP_RV2HV
4580 || cond->op_type == OP_PADHV))
4581
4582 return newUNOP(OP_REFGEN,
4583 0, mod(cond, OP_REFGEN));
4584
4585 else
4586 return cond;
4587}
4588
4589/* These construct the optree fragments representing given()
4590 and when() blocks.
4591
4592 entergiven and enterwhen are LOGOPs; the op_other pointer
4593 points up to the associated leave op. We need this so we
4594 can put it in the context and make break/continue work.
4595 (Also, of course, pp_enterwhen will jump straight to
4596 op_other if the match fails.)
4597 */
4598
4599STATIC
4600OP *
4601S_newGIVWHENOP(pTHX_ OP *cond, OP *block,
4602 I32 enter_opcode, I32 leave_opcode,
4603 PADOFFSET entertarg)
4604{
97aff369 4605 dVAR;
0d863452
RH		 4606 LOGOP *enterop;
4607 OP *o;
4608
4609 NewOp(1101, enterop, 1, LOGOP);
4610 enterop->op_type = enter_opcode;
4611 enterop->op_ppaddr = PL_ppaddr[enter_opcode];
4612 enterop->op_flags = (U8) OPf_KIDS;
4613 enterop->op_targ = ((entertarg == NOT_IN_PAD) ? 0 : entertarg);
4614 enterop->op_private = 0;
4615
4616 o = newUNOP(leave_opcode, 0, (OP *) enterop);
4617
4618 if (cond) {
4619 enterop->op_first = scalar(cond);
4620 cond->op_sibling = block;
4621
4622 o->op_next = LINKLIST(cond);
4623 cond->op_next = (OP *) enterop;
4624 }
4625 else {
4626 /* This is a default {} block */
4627 enterop->op_first = block;
4628 enterop->op_flags |= OPf_SPECIAL;
4629
4630 o->op_next = (OP *) enterop;
4631 }
4632
4633 CHECKOP(enter_opcode, enterop); /* Currently does nothing, since
4634 entergiven and enterwhen both
4635 use ck_null() */
4636
4637 enterop->op_next = LINKLIST(block);
4638 block->op_next = enterop->op_other = o;
4639
4640 return o;
4641}
4642
4643/* Does this look like a boolean operation? For these purposes
4644 a boolean operation is:
4645 - a subroutine call [*]
4646 - a logical connective
4647 - a comparison operator
4648 - a filetest operator, with the exception of -s -M -A -C
4649 - defined(), exists() or eof()
4650 - /$re/ or $foo =~ /$re/
4651
4652 [*] possibly surprising
4653 */
4654STATIC
4655bool
ef519e13 4656S_looks_like_bool(pTHX_ const OP *o)
0d863452 4657{
97aff369 4658 dVAR;
0d863452
RH		 4659 switch(o->op_type) {
4660 case OP_OR:
4661 return looks_like_bool(cLOGOPo->op_first);
4662
4663 case OP_AND:
4664 return (
4665 looks_like_bool(cLOGOPo->op_first)
4666 && looks_like_bool(cLOGOPo->op_first->op_sibling));
4667
4668 case OP_ENTERSUB:
4669
4670 case OP_NOT: case OP_XOR:
4671 /* Note that OP_DOR is not here */
4672
4673 case OP_EQ: case OP_NE: case OP_LT:
4674 case OP_GT: case OP_LE: case OP_GE:
4675
4676 case OP_I_EQ: case OP_I_NE: case OP_I_LT:
4677 case OP_I_GT: case OP_I_LE: case OP_I_GE:
4678
4679 case OP_SEQ: case OP_SNE: case OP_SLT:
4680 case OP_SGT: case OP_SLE: case OP_SGE:
4681
4682 case OP_SMARTMATCH:
4683
4684 case OP_FTRREAD: case OP_FTRWRITE: case OP_FTREXEC:
4685 case OP_FTEREAD: case OP_FTEWRITE: case OP_FTEEXEC:
4686 case OP_FTIS: case OP_FTEOWNED: case OP_FTROWNED:
4687 case OP_FTZERO: case OP_FTSOCK: case OP_FTCHR:
4688 case OP_FTBLK: case OP_FTFILE: case OP_FTDIR:
4689 case OP_FTPIPE: case OP_FTLINK: case OP_FTSUID:
4690 case OP_FTSGID: case OP_FTSVTX: case OP_FTTTY:
4691 case OP_FTTEXT: case OP_FTBINARY:
4692
4693 case OP_DEFINED: case OP_EXISTS:
4694 case OP_MATCH: case OP_EOF:
4695
4696 return TRUE;
4697
4698 case OP_CONST:
4699 /* Detect comparisons that have been optimized away */
4700 if (cSVOPo->op_sv == &PL_sv_yes
4701 || cSVOPo->op_sv == &PL_sv_no)
4702
4703 return TRUE;
4704
4705 /* FALL THROUGH */
4706 default:
4707 return FALSE;
4708 }
4709}
4710
4711OP *
4712Perl_newGIVENOP(pTHX_ OP *cond, OP *block, PADOFFSET defsv_off)
4713{
97aff369 4714 dVAR;
0d863452
RH		 4715 assert( cond );
4716 return newGIVWHENOP(
4717 ref_array_or_hash(cond),
4718 block,
4719 OP_ENTERGIVEN, OP_LEAVEGIVEN,
4720 defsv_off);
4721}
4722
4723/* If cond is null, this is a default {} block */
4724OP *
4725Perl_newWHENOP(pTHX_ OP *cond, OP *block)
4726{
ef519e13 4727 const bool cond_llb = (!cond || looks_like_bool(cond));
0d863452
RH		 4728 OP *cond_op;
4729
4730 if (cond_llb)
4731 cond_op = cond;
4732 else {
4733 cond_op = newBINOP(OP_SMARTMATCH, OPf_SPECIAL,
4734 newDEFSVOP(),
4735 scalar(ref_array_or_hash(cond)));
4736 }
4737
4738 return newGIVWHENOP(
4739 cond_op,
4740 append_elem(block->op_type, block, newOP(OP_BREAK, OPf_SPECIAL)),
4741 OP_ENTERWHEN, OP_LEAVEWHEN, 0);
4742}
4743
7dafbf52
DM		 4744/*
4745=for apidoc cv_undef
4746
4747Clear out all the active components of a CV. This can happen either
4748by an explicit C<undef &foo>, or by the reference count going to zero.
4749In the former case, we keep the CvOUTSIDE pointer, so that any anonymous
4750children can still follow the full lexical scope chain.
4751
4752=cut
4753*/
4754
79072805 4755void
864dbfa3 4756Perl_cv_undef(pTHX_ CV *cv)
79072805 4757{
27da23d5 4758 dVAR;
a636914a 4759#ifdef USE_ITHREADS
aed2304a 4760 if (CvFILE(cv) && !CvISXSUB(cv)) {
35f1c1c7 4761 /* for XSUBs CvFILE point directly to static memory; __FILE__ */
a636914a 4762 Safefree(CvFILE(cv));
a636914a 4763 }
f3e31eb5 4764 CvFILE(cv) = 0;
a636914a
RH		 4765#endif
4766
aed2304a 4767 if (!CvISXSUB(cv) && CvROOT(cv)) {
bb172083 4768 if (SvTYPE(cv) == SVt_PVCV && CvDEPTH(cv))
cea2e8a9 4769 Perl_croak(aTHX_ "Can't undef active subroutine");
8990e307 4770 ENTER;
a0d0e21e 4771
f3548bdc 4772 PAD_SAVE_SETNULLPAD();
a0d0e21e 4773
282f25c9 4774 op_free(CvROOT(cv));
5f66b61c
AL		 4775 CvROOT(cv) = NULL;
4776 CvSTART(cv) = NULL;
8990e307 4777 LEAVE;
79072805 4778 }
1d5db326 4779 SvPOK_off((SV*)cv); /* forget prototype */
a0714e2c 4780 CvGV(cv) = NULL;
a3985cdc
DM		 4781
4782 pad_undef(cv);
4783
7dafbf52
DM		 4784 /* remove CvOUTSIDE unless this is an undef rather than a free */
4785 if (!SvREFCNT(cv) && CvOUTSIDE(cv)) {
4786 if (!CvWEAKOUTSIDE(cv))
4787 SvREFCNT_dec(CvOUTSIDE(cv));
601f1833 4788 CvOUTSIDE(cv) = NULL;
7dafbf52 4789 }
beab0874
JT		 4790 if (CvCONST(cv)) {
4791 SvREFCNT_dec((SV*)CvXSUBANY(cv).any_ptr);
4792 CvCONST_off(cv);
4793 }
d04ba589 4794 if (CvISXSUB(cv) && CvXSUB(cv)) {
96a5add6 4795 CvXSUB(cv) = NULL;
50762d59 4796 }
7dafbf52
DM		 4797 /* delete all flags except WEAKOUTSIDE */
4798 CvFLAGS(cv) &= CVf_WEAKOUTSIDE;
79072805
LW		 4799}
4800
3fe9a6f1 4801void
cbf82dd0
NC		 4802Perl_cv_ckproto_len(pTHX_ const CV *cv, const GV *gv, const char *p,
4803 const STRLEN len)
4804{
4805 /* Can't just use a strcmp on the prototype, as CONSTSUBs "cheat" by
4806 relying on SvCUR, and doubling up the buffer to hold CvFILE(). */
4807 if (((!p != !SvPOK(cv)) /* One has prototype, one has not. */
4808 || (p && (len != SvCUR(cv) /* Not the same length. */
4809 || memNE(p, SvPVX_const(cv), len))))
4810 && ckWARN_d(WARN_PROTOTYPE)) {
2d03de9c 4811 SV* const msg = sv_newmortal();
a0714e2c 4812 SV* name = NULL;
3fe9a6f1 4813
4814 if (gv)
bd61b366 4815 gv_efullname3(name = sv_newmortal(), gv, NULL);
46fc3d4c 4816 sv_setpv(msg, "Prototype mismatch:");
4817 if (name)
95b63a38 4818 Perl_sv_catpvf(aTHX_ msg, " sub %"SVf, (void*)name);
3fe9a6f1 4819 if (SvPOK(cv))
95b63a38 4820 Perl_sv_catpvf(aTHX_ msg, " (%"SVf")", (void*)cv);
ebe643b9 4821 else
396482e1
GA		 4822 sv_catpvs(msg, ": none");
4823 sv_catpvs(msg, " vs ");
46fc3d4c 4824 if (p)
cbf82dd0 4825 Perl_sv_catpvf(aTHX_ msg, "(%.*s)", (int) len, p);
46fc3d4c 4826 else
396482e1 4827 sv_catpvs(msg, "none");
95b63a38 4828 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "%"SVf, (void*)msg);
3fe9a6f1 4829 }
4830}
4831
35f1c1c7
SB		 4832static void const_sv_xsub(pTHX_ CV* cv);
4833
beab0874 4834/*
ccfc67b7
JH		 4835
4836=head1 Optree Manipulation Functions
4837
beab0874
JT		 4838=for apidoc cv_const_sv
4839
4840If C<cv> is a constant sub eligible for inlining. returns the constant
4841value returned by the sub. Otherwise, returns NULL.
4842
4843Constant subs can be created with C<newCONSTSUB> or as described in
4844L<perlsub/"Constant Functions">.
4845
4846=cut
4847*/
760ac839 4848SV *
864dbfa3 4849Perl_cv_const_sv(pTHX_ CV *cv)
760ac839 4850{
96a5add6 4851 PERL_UNUSED_CONTEXT;
5069cc75
NC		 4852 if (!cv)
4853 return NULL;
4854 if (!(SvTYPE(cv) == SVt_PVCV || SvTYPE(cv) == SVt_PVFM))
4855 return NULL;
4856 return CvCONST(cv) ? (SV*)CvXSUBANY(cv).any_ptr : NULL;
fe5e78ed 4857}
760ac839 4858
b5c19bd7
DM		 4859/* op_const_sv: examine an optree to determine whether it's in-lineable.
4860 * Can be called in 3 ways:
4861 *
4862 * !cv
4863 * look for a single OP_CONST with attached value: return the value
4864 *
4865 * cv && CvCLONE(cv) && !CvCONST(cv)
4866 *
4867 * examine the clone prototype, and if contains only a single
4868 * OP_CONST referencing a pad const, or a single PADSV referencing
4869 * an outer lexical, return a non-zero value to indicate the CV is
4870 * a candidate for "constizing" at clone time
4871 *
4872 * cv && CvCONST(cv)
4873 *
4874 * We have just cloned an anon prototype that was marked as a const
4875 * candidiate. Try to grab the current value, and in the case of
4876 * PADSV, ignore it if it has multiple references. Return the value.
4877 */
4878
fe5e78ed 4879SV *
6867be6d 4880Perl_op_const_sv(pTHX_ const OP *o, CV *cv)
fe5e78ed 4881{
97aff369 4882 dVAR;
a0714e2c 4883 SV *sv = NULL;
fe5e78ed 4884
0f79a09d 4885 if (!o)
a0714e2c 4886 return NULL;
1c846c1f
NIS		 4887
4888 if (o->op_type == OP_LINESEQ && cLISTOPo->op_first)
fe5e78ed
GS		 4889 o = cLISTOPo->op_first->op_sibling;
4890
4891 for (; o; o = o->op_next) {
890ce7af 4892 const OPCODE type = o->op_type;
fe5e78ed 4893
1c846c1f 4894 if (sv && o->op_next == o)
fe5e78ed 4895 return sv;
e576b457
JT		 4896 if (o->op_next != o) {
4897 if (type == OP_NEXTSTATE || type == OP_NULL || type == OP_PUSHMARK)
4898 continue;
4899 if (type == OP_DBSTATE)
4900 continue;
4901 }
54310121 4902 if (type == OP_LEAVESUB || type == OP_RETURN)
4903 break;
4904 if (sv)
a0714e2c 4905 return NULL;
7766f137 4906 if (type == OP_CONST && cSVOPo->op_sv)
5dc0d613 4907 sv = cSVOPo->op_sv;
b5c19bd7 4908 else if (cv && type == OP_CONST) {
dd2155a4 4909 sv = PAD_BASE_SV(CvPADLIST(cv), o->op_targ);
beab0874 4910 if (!sv)
a0714e2c 4911 return NULL;
b5c19bd7
DM		 4912 }
4913 else if (cv && type == OP_PADSV) {
4914 if (CvCONST(cv)) { /* newly cloned anon */
4915 sv = PAD_BASE_SV(CvPADLIST(cv), o->op_targ);
4916 /* the candidate should have 1 ref from this pad and 1 ref
4917 * from the parent */
4918 if (!sv || SvREFCNT(sv) != 2)
a0714e2c 4919 return NULL;
beab0874 4920 sv = newSVsv(sv);
b5c19bd7
DM		 4921 SvREADONLY_on(sv);
4922 return sv;
4923 }
4924 else {
4925 if (PAD_COMPNAME_FLAGS(o->op_targ) & SVf_FAKE)
4926 sv = &PL_sv_undef; /* an arbitrary non-null value */
beab0874 4927 }
760ac839 4928 }
b5c19bd7 4929 else {
a0714e2c 4930 return NULL;
b5c19bd7 4931 }
760ac839
LW		 4932 }
4933 return sv;
4934}
4935
eb8433b7
NC		 4936#ifdef PERL_MAD
4937OP *
4938#else
09bef843 4939void
eb8433b7 4940#endif
09bef843
SB		 4941Perl_newMYSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
4942{
99129197
NC		 4943#if 0
4944 /* This would be the return value, but the return cannot be reached. */
eb8433b7
NC		 4945 OP* pegop = newOP(OP_NULL, 0);
4946#endif
4947
46c461b5
AL		 4948 PERL_UNUSED_ARG(floor);
4949
09bef843
SB		 4950 if (o)
4951 SAVEFREEOP(o);
4952 if (proto)
4953 SAVEFREEOP(proto);
4954 if (attrs)
4955 SAVEFREEOP(attrs);
4956 if (block)
4957 SAVEFREEOP(block);
4958 Perl_croak(aTHX_ "\"my sub\" not yet implemented");
eb8433b7 4959#ifdef PERL_MAD
99129197 4960 NORETURN_FUNCTION_END;
eb8433b7 4961#endif
09bef843
SB		 4962}
4963
748a9306 4964CV *
864dbfa3 4965Perl_newSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *block)
79072805 4966{
5f66b61c 4967 return Perl_newATTRSUB(aTHX_ floor, o, proto, NULL, block);
09bef843
SB		 4968}
4969
4970CV *
4971Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
4972{
27da23d5 4973 dVAR;
6867be6d 4974 const char *aname;
83ee9e09 4975 GV *gv;
5c144d81 4976 const char *ps;
ea6e9374 4977 STRLEN ps_len;
c445ea15 4978 register CV *cv = NULL;
beab0874 4979 SV *const_sv;
b48b272a
NC		 4980 /* If the subroutine has no body, no attributes, and no builtin attributes
4981 then it's just a sub declaration, and we may be able to get away with
4982 storing with a placeholder scalar in the symbol table, rather than a
4983 full GV and CV. If anything is present then it will take a full CV to
4984 store it. */
4985 const I32 gv_fetch_flags
eb8433b7
NC		 4986 = (block || attrs || (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS)
4987 || PL_madskills)
b48b272a 4988 ? GV_ADDMULTI : GV_ADDMULTI | GV_NOINIT;
bd61b366 4989 const char * const name = o ? SvPVx_nolen_const(cSVOPo->op_sv) : NULL;
8e742a20
MHM		 4990
4991 if (proto) {
4992 assert(proto->op_type == OP_CONST);
5c144d81 4993 ps = SvPVx_const(((SVOP*)proto)->op_sv, ps_len);
8e742a20
MHM		 4994 }
4995 else
bd61b366 4996 ps = NULL;
8e742a20 4997
83ee9e09 4998 if (!name && PERLDB_NAMEANON && CopLINE(PL_curcop)) {
aec46f14 4999 SV * const sv = sv_newmortal();
c99da370
JH		 5000 Perl_sv_setpvf(aTHX_ sv, "%s[%s:%"IVdf"]",
5001 PL_curstash ? "__ANON__" : "__ANON__::__ANON__",
83ee9e09 5002 CopFILE(PL_curcop), (IV)CopLINE(PL_curcop));
b15aece3 5003 aname = SvPVX_const(sv);
83ee9e09
GS		 5004 }
5005 else
bd61b366 5006 aname = NULL;
61dbb99a 5007
61dbb99a 5008 gv = name ? gv_fetchsv(cSVOPo->op_sv, gv_fetch_flags, SVt_PVCV)
7a5fd60d
NC		 5009 : gv_fetchpv(aname ? aname
5010 : (PL_curstash ? "__ANON__" : "__ANON__::__ANON__"),
61dbb99a 5011 gv_fetch_flags, SVt_PVCV);
83ee9e09 5012
eb8433b7
NC		 5013 if (!PL_madskills) {
5014 if (o)
5015 SAVEFREEOP(o);
5016 if (proto)
5017 SAVEFREEOP(proto);
5018 if (attrs)
5019 SAVEFREEOP(attrs);
5020 }
3fe9a6f1 5021
09bef843 5022 if (SvTYPE(gv) != SVt_PVGV) { /* Maybe prototype now, and had at
55d729e4
GS		 5023 maximum a prototype before. */
5024 if (SvTYPE(gv) > SVt_NULL) {
0453d815 5025 if (!SvPOK((SV*)gv) && !(SvIOK((SV*)gv) && SvIVX((SV*)gv) == -1)
e476b1b5 5026 && ckWARN_d(WARN_PROTOTYPE))
f248d071 5027 {
9014280d 5028 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE), "Runaway prototype");
f248d071 5029 }
cbf82dd0 5030 cv_ckproto_len((CV*)gv, NULL, ps, ps_len);
55d729e4
GS		 5031 }
5032 if (ps)
ea6e9374 5033 sv_setpvn((SV*)gv, ps, ps_len);
55d729e4
GS		 5034 else
5035 sv_setiv((SV*)gv, -1);
3280af22
NIS		 5036 SvREFCNT_dec(PL_compcv);
5037 cv = PL_compcv = NULL;
5038 PL_sub_generation++;
beab0874 5039 goto done;
55d729e4
GS		 5040 }
5041
601f1833 5042 cv = (!name || GvCVGEN(gv)) ? NULL : GvCV(gv);
beab0874 5043
7fb37951
AMS		 5044#ifdef GV_UNIQUE_CHECK
5045 if (cv && GvUNIQUE(gv) && SvREADONLY(cv)) {
5046 Perl_croak(aTHX_ "Can't define subroutine %s (GV is unique)", name);
5bd07a3d
DM		 5047 }
5048#endif
5049
eb8433b7
NC		 5050 if (!block || !ps || *ps || attrs
5051 || (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS)
5052#ifdef PERL_MAD
5053 || block->op_type == OP_NULL
5054#endif
5055 )
a0714e2c 5056 const_sv = NULL;
beab0874 5057 else
601f1833 5058 const_sv = op_const_sv(block, NULL);
beab0874
JT		 5059
5060 if (cv) {
6867be6d 5061 const bool exists = CvROOT(cv) || CvXSUB(cv);
5bd07a3d 5062
7fb37951
AMS		 5063#ifdef GV_UNIQUE_CHECK
5064 if (exists && GvUNIQUE(gv)) {
5065 Perl_croak(aTHX_ "Can't redefine unique subroutine %s", name);
5bd07a3d
DM		 5066 }
5067#endif
5068
60ed1d8c
GS		 5069 /* if the subroutine doesn't exist and wasn't pre-declared
5070 * with a prototype, assume it will be AUTOLOADed,
5071 * skipping the prototype check
5072 */
5073 if (exists || SvPOK(cv))
cbf82dd0 5074 cv_ckproto_len(cv, gv, ps, ps_len);
68dc0745 5075 /* already defined (or promised)? */
60ed1d8c 5076 if (exists || GvASSUMECV(gv)) {
eb8433b7
NC		 5077 if ((!block
5078#ifdef PERL_MAD
5079 || block->op_type == OP_NULL
5080#endif
5081 )&& !attrs) {
d3cea301
SB		 5082 if (CvFLAGS(PL_compcv)) {
5083 /* might have had built-in attrs applied */
5084 CvFLAGS(cv) |= (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS);
5085 }
aa689395 5086 /* just a "sub foo;" when &foo is already defined */
3280af22 5087 SAVEFREESV(PL_compcv);
aa689395 5088 goto done;
5089 }
eb8433b7
NC		 5090 if (block
5091#ifdef PERL_MAD
5092 && block->op_type != OP_NULL
5093#endif
5094 ) {
beab0874
JT		 5095 if (ckWARN(WARN_REDEFINE)
5096 || (CvCONST(cv)
5097 && (!const_sv || sv_cmp(cv_const_sv(cv), const_sv))))
5098 {
6867be6d 5099 const line_t oldline = CopLINE(PL_curcop);
d8a34499
IK		 5100 if (PL_copline != NOLINE)
5101 CopLINE_set(PL_curcop, PL_copline);
9014280d 5102 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
beab0874
JT		 5103 CvCONST(cv) ? "Constant subroutine %s redefined"
5104 : "Subroutine %s redefined", name);
5105 CopLINE_set(PL_curcop, oldline);
5106 }
eb8433b7
NC		 5107#ifdef PERL_MAD
5108 if (!PL_minus_c) /* keep old one around for madskills */
5109#endif
5110 {
5111 /* (PL_madskills unset in used file.) */
5112 SvREFCNT_dec(cv);
5113 }
601f1833 5114 cv = NULL;
79072805 5115 }
79072805
LW		 5116 }
5117 }
beab0874 5118 if (const_sv) {
f84c484e 5119 SvREFCNT_inc_simple_void_NN(const_sv);
beab0874 5120 if (cv) {
0768512c 5121 assert(!CvROOT(cv) && !CvCONST(cv));
c69006e4 5122 sv_setpvn((SV*)cv, "", 0); /* prototype is "" */
beab0874
JT		 5123 CvXSUBANY(cv).any_ptr = const_sv;
5124 CvXSUB(cv) = const_sv_xsub;
5125 CvCONST_on(cv);
d04ba589 5126 CvISXSUB_on(cv);
beab0874
JT		 5127 }
5128 else {
601f1833 5129 GvCV(gv) = NULL;
beab0874
JT		 5130 cv = newCONSTSUB(NULL, name, const_sv);
5131 }
eb8433b7
NC		 5132 PL_sub_generation++;
5133 if (PL_madskills)
5134 goto install_block;
beab0874
JT		 5135 op_free(block);
5136 SvREFCNT_dec(PL_compcv);
5137 PL_compcv = NULL;
beab0874
JT		 5138 goto done;
5139 }
09bef843
SB		 5140 if (attrs) {
5141 HV *stash;
5142 SV *rcv;
5143
5144 /* Need to do a C<use attributes $stash_of_cv,\&cv,@attrs>
5145 * before we clobber PL_compcv.
5146 */
99129197 5147 if (cv && (!block
eb8433b7
NC		 5148#ifdef PERL_MAD
5149 || block->op_type == OP_NULL
5150#endif
5151 )) {
09bef843 5152 rcv = (SV*)cv;
020f0e03
SB		 5153 /* Might have had built-in attributes applied -- propagate them. */
5154 CvFLAGS(cv) |= (CvFLAGS(PL_compcv) & CVf_BUILTIN_ATTRS);
a9164de8 5155 if (CvGV(cv) && GvSTASH(CvGV(cv)))
09bef843 5156 stash = GvSTASH(CvGV(cv));
a9164de8 5157 else if (CvSTASH(cv))
09bef843
SB		 5158 stash = CvSTASH(cv);
5159 else
5160 stash = PL_curstash;
5161 }
5162 else {
5163 /* possibly about to re-define existing subr -- ignore old cv */
5164 rcv = (SV*)PL_compcv;
a9164de8 5165 if (name && GvSTASH(gv))
09bef843
SB		 5166 stash = GvSTASH(gv);
5167 else
5168 stash = PL_curstash;
5169 }
95f0a2f1 5170 apply_attrs(stash, rcv, attrs, FALSE);
09bef843 5171 }
a0d0e21e 5172 if (cv) { /* must reuse cv if autoloaded */
eb8433b7
NC		 5173 if (
5174#ifdef PERL_MAD
5175 (
5176#endif
5177 !block
5178#ifdef PERL_MAD
5179 || block->op_type == OP_NULL) && !PL_madskills
5180#endif
5181 ) {
09bef843
SB		 5182 /* got here with just attrs -- work done, so bug out */
5183 SAVEFREESV(PL_compcv);
5184 goto done;
5185 }
a3985cdc 5186 /* transfer PL_compcv to cv */
4633a7c4 5187 cv_undef(cv);
3280af22 5188 CvFLAGS(cv) = CvFLAGS(PL_compcv);
5c41a5fa
DM		 5189 if (!CvWEAKOUTSIDE(cv))
5190 SvREFCNT_dec(CvOUTSIDE(cv));
3280af22 5191 CvOUTSIDE(cv) = CvOUTSIDE(PL_compcv);
a3985cdc 5192 CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(PL_compcv);
3280af22
NIS		 5193 CvOUTSIDE(PL_compcv) = 0;
5194 CvPADLIST(cv) = CvPADLIST(PL_compcv);
5195 CvPADLIST(PL_compcv) = 0;
282f25c9 5196 /* inner references to PL_compcv must be fixed up ... */
dd2155a4 5197 pad_fixup_inner_anons(CvPADLIST(cv), PL_compcv, cv);
282f25c9 5198 /* ... before we throw it away */
3280af22 5199 SvREFCNT_dec(PL_compcv);
b5c19bd7 5200 PL_compcv = cv;
a933f601
IZ		 5201 if (PERLDB_INTER)/* Advice debugger on the new sub. */
5202 ++PL_sub_generation;
a0d0e21e
LW		 5203 }
5204 else {
3280af22 5205 cv = PL_compcv;
44a8e56a 5206 if (name) {
5207 GvCV(gv) = cv;
eb8433b7
NC		 5208 if (PL_madskills) {
5209 if (strEQ(name, "import")) {
5210 PL_formfeed = (SV*)cv;
5211 Perl_warner(aTHX_ packWARN(WARN_VOID), "%lx\n", (long)cv);
5212 }
5213 }
44a8e56a 5214 GvCVGEN(gv) = 0;
3280af22 5215 PL_sub_generation++;
44a8e56a 5216 }
a0d0e21e 5217 }
65c50114 5218 CvGV(cv) = gv;
a636914a 5219 CvFILE_set_from_cop(cv, PL_curcop);
3280af22 5220 CvSTASH(cv) = PL_curstash;
8990e307 5221
3fe9a6f1 5222 if (ps)
ea6e9374 5223 sv_setpvn((SV*)cv, ps, ps_len);
4633a7c4 5224
3280af22 5225 if (PL_error_count) {
c07a80fd 5226 op_free(block);
5f66b61c 5227 block = NULL;
68dc0745 5228 if (name) {
6867be6d 5229 const char *s = strrchr(name, ':');
68dc0745 5230 s = s ? s+1 : name;
6d4c2119 5231 if (strEQ(s, "BEGIN")) {
e1ec3a88 5232 const char not_safe[] =
6d4c2119 5233 "BEGIN not safe after errors--compilation aborted";
faef0170 5234 if (PL_in_eval & EVAL_KEEPERR)
cea2e8a9 5235 Perl_croak(aTHX_ not_safe);
6d4c2119
CS		 5236 else {
5237 /* force display of errors found but not reported */
38a03e6e 5238 sv_catpv(ERRSV, not_safe);
95b63a38 5239 Perl_croak(aTHX_ "%"SVf, (void*)ERRSV);
6d4c2119
CS		 5240 }
5241 }
68dc0745 5242 }
c07a80fd 5243 }
eb8433b7 5244 install_block:
beab0874
JT		 5245 if (!block)
5246 goto done;
a0d0e21e 5247
7766f137 5248 if (CvLVALUE(cv)) {
78f9721b
SM		 5249 CvROOT(cv) = newUNOP(OP_LEAVESUBLV, 0,
5250 mod(scalarseq(block), OP_LEAVESUBLV));
7766f137
GS		 5251 }
5252 else {
09c2fd24
AE		 5253 /* This makes sub {}; work as expected. */
5254 if (block->op_type == OP_STUB) {
1496a290 5255 OP* const newblock = newSTATEOP(0, NULL, 0);
eb8433b7
NC		 5256#ifdef PERL_MAD
5257 op_getmad(block,newblock,'B');
5258#else
09c2fd24 5259 op_free(block);
eb8433b7
NC		 5260#endif
5261 block = newblock;
09c2fd24 5262 }
7766f137
GS		 5263 CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
5264 }
5265 CvROOT(cv)->op_private |= OPpREFCOUNTED;
5266 OpREFCNT_set(CvROOT(cv), 1);
5267 CvSTART(cv) = LINKLIST(CvROOT(cv));
5268 CvROOT(cv)->op_next = 0;
a2efc822 5269 CALL_PEEP(CvSTART(cv));
7766f137
GS		 5270
5271 /* now that optimizer has done its work, adjust pad values */
54310121 5272
dd2155a4
DM		 5273 pad_tidy(CvCLONE(cv) ? padtidy_SUBCLONE : padtidy_SUB);
5274
5275 if (CvCLONE(cv)) {
beab0874
JT		 5276 assert(!CvCONST(cv));
5277 if (ps && !*ps && op_const_sv(block, cv))
5278 CvCONST_on(cv);
a0d0e21e 5279 }
79072805 5280
83ee9e09 5281 if (name || aname) {
6867be6d 5282 const char *s;
0bd48802 5283 const char * const tname = (name ? name : aname);
44a8e56a 5284
3280af22 5285 if (PERLDB_SUBLINE && PL_curstash != PL_debstash) {
561b68a9 5286 SV * const sv = newSV(0);
c4420975 5287 SV * const tmpstr = sv_newmortal();
5c1737d1
NC		 5288 GV * const db_postponed = gv_fetchpvs("DB::postponed",
5289 GV_ADDMULTI, SVt_PVHV);
44a8e56a 5290 HV *hv;
5291
ed094faf
GS		 5292 Perl_sv_setpvf(aTHX_ sv, "%s:%ld-%ld",
5293 CopFILE(PL_curcop),
cc49e20b 5294 (long)PL_subline, (long)CopLINE(PL_curcop));
bd61b366 5295 gv_efullname3(tmpstr, gv, NULL);
b15aece3 5296 hv_store(GvHV(PL_DBsub), SvPVX_const(tmpstr), SvCUR(tmpstr), sv, 0);
44a8e56a 5297 hv = GvHVn(db_postponed);
551405c4
AL		 5298 if (HvFILL(hv) > 0 && hv_exists(hv, SvPVX_const(tmpstr), SvCUR(tmpstr))) {
5299 CV * const pcv = GvCV(db_postponed);
5300 if (pcv) {
5301 dSP;
5302 PUSHMARK(SP);
5303 XPUSHs(tmpstr);
5304 PUTBACK;
5305 call_sv((SV*)pcv, G_DISCARD);
5306 }
44a8e56a 5307 }
5308 }
79072805 5309
83ee9e09 5310 if ((s = strrchr(tname,':')))
28757baa 5311 s++;
5312 else
83ee9e09 5313 s = tname;
ed094faf 5314
7d30b5c4 5315 if (*s != 'B' && *s != 'E' && *s != 'C' && *s != 'I')
ed094faf
GS		 5316 goto done;
5317
7678c486 5318 if (strEQ(s, "BEGIN") && !PL_error_count) {
6867be6d 5319 const I32 oldscope = PL_scopestack_ix;
28757baa 5320 ENTER;
57843af0
GS		 5321 SAVECOPFILE(&PL_compiling);
5322 SAVECOPLINE(&PL_compiling);
28757baa 5323
3280af22
NIS		 5324 if (!PL_beginav)
5325 PL_beginav = newAV();
28757baa 5326 DEBUG_x( dump_sub(gv) );
ea2f84a3
GS		 5327 av_push(PL_beginav, (SV*)cv);
5328 GvCV(gv) = 0; /* cv has been hijacked */
3280af22 5329 call_list(oldscope, PL_beginav);
a6006777 5330
3280af22 5331 PL_curcop = &PL_compiling;
623e6609 5332 CopHINTS_set(&PL_compiling, PL_hints);
28757baa 5333 LEAVE;
5334 }
3280af22
NIS		 5335 else if (strEQ(s, "END") && !PL_error_count) {
5336 if (!PL_endav)
5337 PL_endav = newAV();
ed094faf 5338 DEBUG_x( dump_sub(gv) );
3280af22 5339 av_unshift(PL_endav, 1);
ea2f84a3
GS		 5340 av_store(PL_endav, 0, (SV*)cv);
5341 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 5342 }
7d30b5c4
GS		 5343 else if (strEQ(s, "CHECK") && !PL_error_count) {
5344 if (!PL_checkav)
5345 PL_checkav = newAV();
ed094faf 5346 DEBUG_x( dump_sub(gv) );
ddda08b7 5347 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 5348 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run CHECK block");
7d30b5c4 5349 av_unshift(PL_checkav, 1);
ea2f84a3
GS		 5350 av_store(PL_checkav, 0, (SV*)cv);
5351 GvCV(gv) = 0; /* cv has been hijacked */
4f25aa18 5352 }
3280af22
NIS		 5353 else if (strEQ(s, "INIT") && !PL_error_count) {
5354 if (!PL_initav)
5355 PL_initav = newAV();
ed094faf 5356 DEBUG_x( dump_sub(gv) );
ddda08b7 5357 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 5358 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run INIT block");
ea2f84a3
GS		 5359 av_push(PL_initav, (SV*)cv);
5360 GvCV(gv) = 0; /* cv has been hijacked */
ae77835f 5361 }
79072805 5362 }
a6006777 5363
aa689395 5364 done:
3280af22 5365 PL_copline = NOLINE;
8990e307 5366 LEAVE_SCOPE(floor);
a0d0e21e 5367 return cv;
79072805
LW		 5368}
5369
b099ddc0 5370/* XXX unsafe for threads if eval_owner isn't held */
954c1994
GS		 5371/*
5372=for apidoc newCONSTSUB
5373
5374Creates a constant sub equivalent to Perl C<sub FOO () { 123 }> which is
5375eligible for inlining at compile-time.
5376
5377=cut
5378*/
5379
beab0874 5380CV *
e1ec3a88 5381Perl_newCONSTSUB(pTHX_ HV *stash, const char *name, SV *sv)
5476c433 5382{
27da23d5 5383 dVAR;
beab0874 5384 CV* cv;
cbf82dd0
NC		 5385#ifdef USE_ITHREADS
5386 const char *const temp_p = CopFILE(PL_curcop);
07fcac01 5387 const STRLEN len = temp_p ? strlen(temp_p) : 0;
cbf82dd0
NC		 5388#else
5389 SV *const temp_sv = CopFILESV(PL_curcop);
5390 STRLEN len;
5391 const char *const temp_p = temp_sv ? SvPV_const(temp_sv, len) : NULL;
5392#endif
07fcac01 5393 char *const file = savepvn(temp_p, temp_p ? len : 0);
5476c433 5394
11faa288 5395 ENTER;
11faa288 5396
f4dd75d9 5397 SAVECOPLINE(PL_curcop);
11faa288 5398 CopLINE_set(PL_curcop, PL_copline);
f4dd75d9
GS		 5399
5400 SAVEHINTS();
3280af22 5401 PL_hints &= ~HINT_BLOCK_SCOPE;
11faa288
GS		 5402
5403 if (stash) {
5404 SAVESPTR(PL_curstash);
5405 SAVECOPSTASH(PL_curcop);
5406 PL_curstash = stash;
05ec9bb3 5407 CopSTASH_set(PL_curcop,stash);
11faa288 5408 }
5476c433 5409
cbf82dd0
NC		 5410 /* file becomes the CvFILE. For an XS, it's supposed to be static storage,
5411 and so doesn't get free()d. (It's expected to be from the C pre-
5412 processor __FILE__ directive). But we need a dynamically allocated one,
77004dee
NC		 5413 and we need it to get freed. */
5414 cv = newXS_flags(name, const_sv_xsub, file, "", XS_DYNAMIC_FILENAME);
beab0874
JT		 5415 CvXSUBANY(cv).any_ptr = sv;
5416 CvCONST_on(cv);
5476c433 5417
65e66c80 5418#ifdef USE_ITHREADS
02f28d44
MHM		 5419 if (stash)
5420 CopSTASH_free(PL_curcop);
65e66c80 5421#endif
11faa288 5422 LEAVE;
beab0874
JT		 5423
5424 return cv;
5476c433
JD		 5425}
5426
77004dee
NC		 5427CV *
5428Perl_newXS_flags(pTHX_ const char *name, XSUBADDR_t subaddr,
5429 const char *const filename, const char *const proto,
5430 U32 flags)
5431{
5432 CV *cv = newXS(name, subaddr, filename);
5433
5434 if (flags & XS_DYNAMIC_FILENAME) {
5435 /* We need to "make arrangements" (ie cheat) to ensure that the
5436 filename lasts as long as the PVCV we just created, but also doesn't
5437 leak */
5438 STRLEN filename_len = strlen(filename);
5439 STRLEN proto_and_file_len = filename_len;
5440 char *proto_and_file;
5441 STRLEN proto_len;
5442
5443 if (proto) {
5444 proto_len = strlen(proto);
5445 proto_and_file_len += proto_len;
5446
5447 Newx(proto_and_file, proto_and_file_len + 1, char);
5448 Copy(proto, proto_and_file, proto_len, char);
5449 Copy(filename, proto_and_file + proto_len, filename_len + 1, char);
5450 } else {
5451 proto_len = 0;
5452 proto_and_file = savepvn(filename, filename_len);
5453 }
5454
5455 /* This gets free()d. :-) */
5456 sv_usepvn_flags((SV*)cv, proto_and_file, proto_and_file_len,
5457 SV_HAS_TRAILING_NUL);
5458 if (proto) {
5459 /* This gives us the correct prototype, rather than one with the
5460 file name appended. */
5461 SvCUR_set(cv, proto_len);
5462 } else {
5463 SvPOK_off(cv);
5464 }
81a2b3b6 5465 CvFILE(cv) = proto_and_file + proto_len;
77004dee
NC		 5466 } else {
5467 sv_setpv((SV *)cv, proto);
5468 }
5469 return cv;
5470}
5471
954c1994
GS		 5472/*
5473=for apidoc U||newXS
5474
77004dee
NC		 5475Used by C<xsubpp> to hook up XSUBs as Perl subs. I<filename> needs to be
5476static storage, as it is used directly as CvFILE(), without a copy being made.
954c1994
GS		 5477
5478=cut
5479*/
5480
57d3b86d 5481CV *
bfed75c6 5482Perl_newXS(pTHX_ const char *name, XSUBADDR_t subaddr, const char *filename)
a0d0e21e 5483{
97aff369 5484 dVAR;
9a957fbc 5485 GV * const gv = gv_fetchpv(name ? name :
c99da370
JH		 5486 (PL_curstash ? "__ANON__" : "__ANON__::__ANON__"),
5487 GV_ADDMULTI, SVt_PVCV);
79072805 5488 register CV *cv;
44a8e56a 5489
1ecdd9a8
HS		 5490 if (!subaddr)
5491 Perl_croak(aTHX_ "panic: no address for '%s' in '%s'", name, filename);
5492
601f1833 5493 if ((cv = (name ? GvCV(gv) : NULL))) {
44a8e56a 5494 if (GvCVGEN(gv)) {
5495 /* just a cached method */
5496 SvREFCNT_dec(cv);
601f1833 5497 cv = NULL;
44a8e56a 5498 }
5499 else if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
5500 /* already defined (or promised) */
1df70142 5501 /* XXX It's possible for this HvNAME_get to return null, and get passed into strEQ */
66a1b24b
AL		 5502 if (ckWARN(WARN_REDEFINE)) {
5503 GV * const gvcv = CvGV(cv);
5504 if (gvcv) {
5505 HV * const stash = GvSTASH(gvcv);
5506 if (stash) {
8b38226b
AL		 5507 const char *redefined_name = HvNAME_get(stash);
5508 if ( strEQ(redefined_name,"autouse") ) {
66a1b24b
AL		 5509 const line_t oldline = CopLINE(PL_curcop);
5510 if (PL_copline != NOLINE)
5511 CopLINE_set(PL_curcop, PL_copline);
5512 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
5513 CvCONST(cv) ? "Constant subroutine %s redefined"
5514 : "Subroutine %s redefined"
5515 ,name);
5516 CopLINE_set(PL_curcop, oldline);
5517 }
5518 }
5519 }
a0d0e21e
LW		 5520 }
5521 SvREFCNT_dec(cv);
601f1833 5522 cv = NULL;
79072805 5523 }
79072805 5524 }
44a8e56a 5525
5526 if (cv) /* must reuse cv if autoloaded */
5527 cv_undef(cv);
a0d0e21e 5528 else {
561b68a9 5529 cv = (CV*)newSV(0);
a0d0e21e 5530 sv_upgrade((SV *)cv, SVt_PVCV);
44a8e56a 5531 if (name) {
5532 GvCV(gv) = cv;
5533 GvCVGEN(gv) = 0;
3280af22 5534 PL_sub_generation++;
44a8e56a 5535 }
a0d0e21e 5536 }
65c50114 5537 CvGV(cv) = gv;
b195d487 5538 (void)gv_fetchfile(filename);
dd374669 5539 CvFILE(cv) = (char *)filename; /* NOTE: not copied, as it is expected to be
57843af0 5540 an external constant string */
d04ba589 5541 CvISXSUB_on(cv);
a0d0e21e 5542 CvXSUB(cv) = subaddr;
44a8e56a 5543
28757baa 5544 if (name) {
e1ec3a88 5545 const char *s = strrchr(name,':');
28757baa 5546 if (s)
5547 s++;
5548 else
5549 s = name;
ed094faf 5550
7d30b5c4 5551 if (*s != 'B' && *s != 'E' && *s != 'C' && *s != 'I')
ed094faf
GS		 5552 goto done;
5553
28757baa 5554 if (strEQ(s, "BEGIN")) {
3280af22
NIS		 5555 if (!PL_beginav)
5556 PL_beginav = newAV();
ea2f84a3
GS		 5557 av_push(PL_beginav, (SV*)cv);
5558 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 5559 }
5560 else if (strEQ(s, "END")) {
3280af22
NIS		 5561 if (!PL_endav)
5562 PL_endav = newAV();
5563 av_unshift(PL_endav, 1);
ea2f84a3
GS		 5564 av_store(PL_endav, 0, (SV*)cv);
5565 GvCV(gv) = 0; /* cv has been hijacked */
28757baa 5566 }
7d30b5c4
GS		 5567 else if (strEQ(s, "CHECK")) {
5568 if (!PL_checkav)
5569 PL_checkav = newAV();
ddda08b7 5570 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 5571 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run CHECK block");
7d30b5c4 5572 av_unshift(PL_checkav, 1);
ea2f84a3
GS		 5573 av_store(PL_checkav, 0, (SV*)cv);
5574 GvCV(gv) = 0; /* cv has been hijacked */
4f25aa18 5575 }
7d07dbc2 5576 else if (strEQ(s, "INIT")) {
3280af22
NIS		 5577 if (!PL_initav)
5578 PL_initav = newAV();
ddda08b7 5579 if (PL_main_start && ckWARN(WARN_VOID))
9014280d 5580 Perl_warner(aTHX_ packWARN(WARN_VOID), "Too late to run INIT block");
ea2f84a3
GS		 5581 av_push(PL_initav, (SV*)cv);
5582 GvCV(gv) = 0; /* cv has been hijacked */
ae77835f 5583 }
28757baa 5584 }
8990e307 5585 else
a5f75d66 5586 CvANON_on(cv);
44a8e56a 5587
ed094faf 5588done:
a0d0e21e 5589 return cv;
79072805
LW		 5590}
5591
eb8433b7
NC		 5592#ifdef PERL_MAD
5593OP *
5594#else
79072805 5595void
eb8433b7 5596#endif
864dbfa3 5597Perl_newFORM(pTHX_ I32 floor, OP *o, OP *block)
79072805 5598{
97aff369 5599 dVAR;
79072805 5600 register CV *cv;
eb8433b7
NC		 5601#ifdef PERL_MAD
5602 OP* pegop = newOP(OP_NULL, 0);
5603#endif
79072805 5604
0bd48802 5605 GV * const gv = o
f776e3cd 5606 ? gv_fetchsv(cSVOPo->op_sv, GV_ADD, SVt_PVFM)
fafc274c 5607 : gv_fetchpvs("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVFM);
0bd48802 5608
7fb37951
AMS		 5609#ifdef GV_UNIQUE_CHECK
5610 if (GvUNIQUE(gv)) {
5611 Perl_croak(aTHX_ "Bad symbol for form (GV is unique)");
5bd07a3d
DM		 5612 }
5613#endif
a5f75d66 5614 GvMULTI_on(gv);
155aba94 5615 if ((cv = GvFORM(gv))) {
599cee73 5616 if (ckWARN(WARN_REDEFINE)) {
6867be6d 5617 const line_t oldline = CopLINE(PL_curcop);
d8a34499
IK		 5618 if (PL_copline != NOLINE)
5619 CopLINE_set(PL_curcop, PL_copline);
7a5fd60d
NC		 5620 Perl_warner(aTHX_ packWARN(WARN_REDEFINE),
5621 o ? "Format %"SVf" redefined"
95b63a38 5622 : "Format STDOUT redefined", (void*)cSVOPo->op_sv);
57843af0 5623 CopLINE_set(PL_curcop, oldline);
79072805 5624 }
8990e307 5625 SvREFCNT_dec(cv);
79072805 5626 }
3280af22 5627 cv = PL_compcv;
79072805 5628 GvFORM(gv) = cv;
65c50114 5629 CvGV(cv) = gv;
a636914a 5630 CvFILE_set_from_cop(cv, PL_curcop);
79072805 5631
a0d0e21e 5632
dd2155a4 5633 pad_tidy(padtidy_FORMAT);
79072805 5634 CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
7934575e
GS		 5635 CvROOT(cv)->op_private |= OPpREFCOUNTED;
5636 OpREFCNT_set(CvROOT(cv), 1);
79072805
LW		 5637 CvSTART(cv) = LINKLIST(CvROOT(cv));
5638 CvROOT(cv)->op_next = 0;
a2efc822 5639 CALL_PEEP(CvSTART(cv));
eb8433b7
NC		 5640#ifdef PERL_MAD
5641 op_getmad(o,pegop,'n');
5642 op_getmad_weak(block, pegop, 'b');
5643#else
11343788 5644 op_free(o);
eb8433b7 5645#endif
3280af22 5646 PL_copline = NOLINE;
8990e307 5647 LEAVE_SCOPE(floor);
eb8433b7
NC		 5648#ifdef PERL_MAD
5649 return pegop;
5650#endif
79072805
LW		 5651}
5652
5653OP *
864dbfa3 5654Perl_newANONLIST(pTHX_ OP *o)
79072805 5655{
93a17b20 5656 return newUNOP(OP_REFGEN, 0,
11343788 5657 mod(list(convert(OP_ANONLIST, 0, o)), OP_REFGEN));
79072805
LW		 5658}
5659
5660OP *
864dbfa3 5661Perl_newANONHASH(pTHX_ OP *o)
79072805 5662{
93a17b20 5663 return newUNOP(OP_REFGEN, 0,
11343788 5664 mod(list(convert(OP_ANONHASH, 0, o)), OP_REFGEN));
a0d0e21e
LW		 5665}
5666
5667OP *
864dbfa3 5668Perl_newANONSUB(pTHX_ I32 floor, OP *proto, OP *block)
a0d0e21e 5669{
5f66b61c 5670 return newANONATTRSUB(floor, proto, NULL, block);
09bef843
SB		 5671}
5672
5673OP *
5674Perl_newANONATTRSUB(pTHX_ I32 floor, OP *proto, OP *attrs, OP *block)
5675{
a0d0e21e 5676 return newUNOP(OP_REFGEN, 0,
09bef843
SB		 5677 newSVOP(OP_ANONCODE, 0,
5678 (SV*)newATTRSUB(floor, 0, proto, attrs, block)));
79072805
LW		 5679}
5680
5681OP *
864dbfa3 5682Perl_oopsAV(pTHX_ OP *o)
79072805 5683{
27da23d5 5684 dVAR;
ed6116ce
LW		 5685 switch (o->op_type) {
5686 case OP_PADSV:
5687 o->op_type = OP_PADAV;
22c35a8c 5688 o->op_ppaddr = PL_ppaddr[OP_PADAV];
51e247a3 5689 return ref(o, OP_RV2AV);
b2ffa427 5690
ed6116ce 5691 case OP_RV2SV:
79072805 5692 o->op_type = OP_RV2AV;
22c35a8c 5693 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
79072805 5694 ref(o, OP_RV2AV);
ed6116ce
LW		 5695 break;
5696
5697 default:
0453d815 5698 if (ckWARN_d(WARN_INTERNAL))
9014280d 5699 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "oops: oopsAV");
ed6116ce
LW		 5700 break;
5701 }
79072805
LW		 5702 return o;
5703}
5704
5705OP *
864dbfa3 5706Perl_oopsHV(pTHX_ OP *o)
79072805 5707{
27da23d5 5708 dVAR;
ed6116ce
LW		 5709 switch (o->op_type) {
5710 case OP_PADSV:
5711 case OP_PADAV:
5712 o->op_type = OP_PADHV;
22c35a8c 5713 o->op_ppaddr = PL_ppaddr[OP_PADHV];
51e247a3 5714 return ref(o, OP_RV2HV);
ed6116ce
LW		 5715
5716 case OP_RV2SV:
5717 case OP_RV2AV:
79072805 5718 o->op_type = OP_RV2HV;
22c35a8c 5719 o->op_ppaddr = PL_ppaddr[OP_RV2HV];
79072805 5720 ref(o, OP_RV2HV);
ed6116ce
LW		 5721 break;
5722
5723 default:
0453d815 5724 if (ckWARN_d(WARN_INTERNAL))
9014280d 5725 Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "oops: oopsHV");
ed6116ce
LW		 5726 break;
5727 }
79072805
LW		 5728 return o;
5729}
5730
5731OP *
864dbfa3 5732Perl_newAVREF(pTHX_ OP *o)
79072805 5733{
27da23d5 5734 dVAR;
ed6116ce
LW		 5735 if (o->op_type == OP_PADANY) {
5736 o->op_type = OP_PADAV;
22c35a8c 5737 o->op_ppaddr = PL_ppaddr[OP_PADAV];
93a17b20 5738 return o;
ed6116ce 5739 }
a1063b2d 5740 else if ((o->op_type == OP_RV2AV || o->op_type == OP_PADAV)
9014280d
PM		 5741 && ckWARN(WARN_DEPRECATED)) {
5742 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
a1063b2d
RH		 5743 "Using an array as a reference is deprecated");
5744 }
79072805
LW		 5745 return newUNOP(OP_RV2AV, 0, scalar(o));
5746}
5747
5748OP *
864dbfa3 5749Perl_newGVREF(pTHX_ I32 type, OP *o)
79072805 5750{
82092f1d 5751 if (type == OP_MAPSTART || type == OP_GREPSTART || type == OP_SORT)
a0d0e21e 5752 return newUNOP(OP_NULL, 0, o);
748a9306 5753 return ref(newUNOP(OP_RV2GV, OPf_REF, o), type);
79072805
LW		 5754}
5755
5756OP *
864dbfa3 5757Perl_newHVREF(pTHX_ OP *o)
79072805 5758{
27da23d5 5759 dVAR;
ed6116ce
LW		 5760 if (o->op_type == OP_PADANY) {
5761 o->op_type = OP_PADHV;
22c35a8c 5762 o->op_ppaddr = PL_ppaddr[OP_PADHV];
93a17b20 5763 return o;
ed6116ce 5764 }
a1063b2d 5765 else if ((o->op_type == OP_RV2HV || o->op_type == OP_PADHV)
9014280d
PM		 5766 && ckWARN(WARN_DEPRECATED)) {
5767 Perl_warner(aTHX_ packWARN(WARN_DEPRECATED),
a1063b2d
RH		 5768 "Using a hash as a reference is deprecated");
5769 }
79072805
LW		 5770 return newUNOP(OP_RV2HV, 0, scalar(o));
5771}
5772
5773OP *
864dbfa3 5774Perl_newCVREF(pTHX_ I32 flags, OP *o)
79072805 5775{
c07a80fd 5776 return newUNOP(OP_RV2CV, flags, scalar(o));
79072805
LW		 5777}
5778
5779OP *
864dbfa3 5780Perl_newSVREF(pTHX_ OP *o)
79072805 5781{
27da23d5 5782 dVAR;
ed6116ce
LW		 5783 if (o->op_type == OP_PADANY) {
5784 o->op_type = OP_PADSV;
22c35a8c 5785 o->op_ppaddr = PL_ppaddr[OP_PADSV];
93a17b20 5786 return o;
ed6116ce 5787 }
224a4551
MB		 5788 else if (o->op_type == OP_THREADSV && !(o->op_flags & OPpDONE_SVREF)) {
5789 o->op_flags |= OPpDONE_SVREF;
a863c7d1 5790 return o;
224a4551 5791 }
79072805
LW		 5792 return newUNOP(OP_RV2SV, 0, scalar(o));
5793}
5794
61b743bb
DM		 5795/* Check routines. See the comments at the top of this file for details
5796 * on when these are called */
79072805
LW		 5797
5798OP *
cea2e8a9 5799Perl_ck_anoncode(pTHX_ OP *o)
5f05dabc 5800{
dd2155a4 5801 cSVOPo->op_targ = pad_add_anon(cSVOPo->op_sv, o->op_type);
eb8433b7 5802 if (!PL_madskills)
1d866c12 5803 cSVOPo->op_sv = NULL;
5dc0d613 5804 return o;
5f05dabc 5805}
5806
5807OP *
cea2e8a9 5808Perl_ck_bitop(pTHX_ OP *o)
55497cff 5809{
97aff369 5810 dVAR;
276b2a0c
RGS		 5811#define OP_IS_NUMCOMPARE(op) \
5812 ((op) == OP_LT || (op) == OP_I_LT || \
5813 (op) == OP_GT || (op) == OP_I_GT || \
5814 (op) == OP_LE || (op) == OP_I_LE || \
5815 (op) == OP_GE || (op) == OP_I_GE || \
5816 (op) == OP_EQ || (op) == OP_I_EQ || \
5817 (op) == OP_NE || (op) == OP_I_NE || \
5818 (op) == OP_NCMP || (op) == OP_I_NCMP)
d5ec2987 5819 o->op_private = (U8)(PL_hints & HINT_INTEGER);
2b84528b
RGS		 5820 if (!(o->op_flags & OPf_STACKED) /* Not an assignment */
5821 && (o->op_type == OP_BIT_OR
5822 || o->op_type == OP_BIT_AND
5823 || o->op_type == OP_BIT_XOR))
276b2a0c 5824 {
1df70142
AL		 5825 const OP * const left = cBINOPo->op_first;
5826 const OP * const right = left->op_sibling;
96a925ab
YST		 5827 if ((OP_IS_NUMCOMPARE(left->op_type) &&
5828 (left->op_flags & OPf_PARENS) == 0) ||
5829 (OP_IS_NUMCOMPARE(right->op_type) &&
5830 (right->op_flags & OPf_PARENS) == 0))
276b2a0c
RGS		 5831 if (ckWARN(WARN_PRECEDENCE))
5832 Perl_warner(aTHX_ packWARN(WARN_PRECEDENCE),
5833 "Possible precedence problem on bitwise %c operator",
5834 o->op_type == OP_BIT_OR ? '|'
5835 : o->op_type == OP_BIT_AND ? '&' : '^'
5836 );
5837 }
5dc0d613 5838 return o;
55497cff 5839}
5840
5841OP *
cea2e8a9 5842Perl_ck_concat(pTHX_ OP *o)
79072805 5843{
0bd48802 5844 const OP * const kid = cUNOPo->op_first;
96a5add6 5845 PERL_UNUSED_CONTEXT;
df91b2c5
AE		 5846 if (kid->op_type == OP_CONCAT && !(kid->op_private & OPpTARGET_MY) &&
5847 !(kUNOP->op_first->op_flags & OPf_MOD))
0165acc7 5848 o->op_flags |= OPf_STACKED;
11343788 5849 return o;
79072805
LW		 5850}
5851
5852OP *
cea2e8a9 5853Perl_ck_spair(pTHX_ OP *o)
79072805 5854{
27da23d5 5855 dVAR;
11343788 5856 if (o->op_flags & OPf_KIDS) {
79072805 5857 OP* newop;
a0d0e21e 5858 OP* kid;
6867be6d 5859 const OPCODE type = o->op_type;
5dc0d613 5860 o = modkids(ck_fun(o), type);
11343788 5861 kid = cUNOPo->op_first;
a0d0e21e 5862 newop = kUNOP->op_first->op_sibling;
1496a290
AL		 5863 if (newop) {
5864 const OPCODE type = newop->op_type;
5865 if (newop->op_sibling || !(PL_opargs[type] & OA_RETSCALAR) ||
5866 type == OP_PADAV || type == OP_PADHV ||
5867 type == OP_RV2AV || type == OP_RV2HV)
5868 return o;
a0d0e21e 5869 }
eb8433b7
NC		 5870#ifdef PERL_MAD
5871 op_getmad(kUNOP->op_first,newop,'K');
5872#else
a0d0e21e 5873 op_free(kUNOP->op_first);
eb8433b7 5874#endif
a0d0e21e
LW		 5875 kUNOP->op_first = newop;
5876 }
22c35a8c 5877 o->op_ppaddr = PL_ppaddr[++o->op_type];
11343788 5878 return ck_fun(o);
a0d0e21e
LW		 5879}
5880
5881OP *
cea2e8a9 5882Perl_ck_delete(pTHX_ OP *o)
a0d0e21e 5883{
11343788 5884 o = ck_fun(o);
5dc0d613 5885 o->op_private = 0;
11343788 5886 if (o->op_flags & OPf_KIDS) {
551405c4 5887 OP * const kid = cUNOPo->op_first;
01020589
GS		 5888 switch (kid->op_type) {
5889 case OP_ASLICE:
5890 o->op_flags |= OPf_SPECIAL;
5891 /* FALL THROUGH */
5892 case OP_HSLICE:
5dc0d613 5893 o->op_private |= OPpSLICE;
01020589
GS		 5894 break;
5895 case OP_AELEM:
5896 o->op_flags |= OPf_SPECIAL;
5897 /* FALL THROUGH */
5898 case OP_HELEM:
5899 break;
5900 default:
5901 Perl_croak(aTHX_ "%s argument is not a HASH or ARRAY element or slice",
53e06cf0 5902 OP_DESC(o));
01020589 5903 }
93c66552 5904 op_null(kid);
79072805 5905 }
11343788 5906 return o;
79072805
LW		 5907}
5908
5909OP *
96e176bf
CL		 5910Perl_ck_die(pTHX_ OP *o)
5911{
5912#ifdef VMS
5913 if (VMSISH_HUSHED) o->op_private |= OPpHUSH_VMSISH;
5914#endif
5915 return ck_fun(o);
5916}
5917
5918OP *
cea2e8a9 5919Perl_ck_eof(pTHX_ OP *o)
79072805 5920{
97aff369 5921 dVAR;
79072805 5922
11343788
MB		 5923 if (o->op_flags & OPf_KIDS) {
5924 if (cLISTOPo->op_first->op_type == OP_STUB) {
1d866c12
AL		 5925 OP * const newop
5926 = newUNOP(o->op_type, OPf_SPECIAL, newGVOP(OP_GV, 0, PL_argvgv));
eb8433b7
NC		 5927#ifdef PERL_MAD
5928 op_getmad(o,newop,'O');
5929#else
11343788 5930 op_free(o);
eb8433b7
NC		 5931#endif
5932 o = newop;
8990e307 5933 }
11343788 5934 return ck_fun(o);
79072805 5935 }
11343788 5936 return o;
79072805
LW		 5937}
5938
5939OP *
cea2e8a9 5940Perl_ck_eval(pTHX_ OP *o)
79072805 5941{
27da23d5 5942 dVAR;
3280af22 5943 PL_hints |= HINT_BLOCK_SCOPE;
11343788 5944 if (o->op_flags & OPf_KIDS) {
46c461b5 5945 SVOP * const kid = (SVOP*)cUNOPo->op_first;
79072805 5946
93a17b20 5947 if (!kid) {
11343788 5948 o->op_flags &= ~OPf_KIDS;
93c66552 5949 op_null(o);
79072805 5950 }
b14574b4 5951 else if (kid->op_type == OP_LINESEQ || kid->op_type == OP_STUB) {
79072805 5952 LOGOP *enter;
eb8433b7 5953#ifdef PERL_MAD
1d866c12 5954 OP* const oldo = o;
eb8433b7 5955#endif
79072805 5956
11343788 5957 cUNOPo->op_first = 0;
eb8433b7 5958#ifndef PERL_MAD
11343788 5959 op_free(o);
eb8433b7 5960#endif
79072805 5961
b7dc083c 5962 NewOp(1101, enter, 1, LOGOP);
79072805 5963 enter->op_type = OP_ENTERTRY;
22c35a8c 5964 enter->op_ppaddr = PL_ppaddr[OP_ENTERTRY];
79072805
LW		 5965 enter->op_private = 0;
5966
5967 /* establish postfix order */
5968 enter->op_next = (OP*)enter;
5969
11343788
MB		 5970 o = prepend_elem(OP_LINESEQ, (OP*)enter, (OP*)kid);
5971 o->op_type = OP_LEAVETRY;
22c35a8c 5972 o->op_ppaddr = PL_ppaddr[OP_LEAVETRY];
11343788 5973 enter->op_other = o;
eb8433b7 5974 op_getmad(oldo,o,'O');
11343788 5975 return o;
79072805 5976 }
b5c19bd7 5977 else {
473986ff 5978 scalar((OP*)kid);
b5c19bd7
DM		 5979 PL_cv_has_eval = 1;
5980 }
79072805
LW		 5981 }
5982 else {
eb8433b7 5983#ifdef PERL_MAD
1d866c12 5984 OP* const oldo = o;
eb8433b7 5985#else
11343788 5986 op_free(o);
eb8433b7 5987#endif
54b9620d 5988 o = newUNOP(OP_ENTEREVAL, 0, newDEFSVOP());
eb8433b7 5989 op_getmad(oldo,o,'O');
79072805 5990 }
3280af22 5991 o->op_targ = (PADOFFSET)PL_hints;
7168684c 5992 if ((PL_hints & HINT_LOCALIZE_HH) != 0 && GvHV(PL_hintgv)) {
0d863452 5993 /* Store a copy of %^H that pp_entereval can pick up */
5b9c0671
NC		 5994 OP *hhop = newSVOP(OP_CONST, 0,
5995 (SV*)Perl_hv_copy_hints_hv(aTHX_ GvHV(PL_hintgv)));
0d863452
RH		 5996 cUNOPo->op_first->op_sibling = hhop;
5997 o->op_private |= OPpEVAL_HAS_HH;
5998 }
11343788 5999 return o;
79072805
LW		 6000}
6001
6002OP *
d98f61e7
GS		 6003Perl_ck_exit(pTHX_ OP *o)
6004{
6005#ifdef VMS
551405c4 6006 HV * const table = GvHV(PL_hintgv);
d98f61e7 6007 if (table) {
a4fc7abc 6008 SV * const * const svp = hv_fetchs(table, "vmsish_exit", FALSE);
d98f61e7
GS		 6009 if (svp && *svp && SvTRUE(*svp))
6010 o->op_private |= OPpEXIT_VMSISH;
6011 }
96e176bf 6012 if (VMSISH_HUSHED) o->op_private |= OPpHUSH_VMSISH;
d98f61e7
GS		 6013#endif
6014 return ck_fun(o);
6015}
6016
6017OP *
cea2e8a9 6018Perl_ck_exec(pTHX_ OP *o)
79072805 6019{
11343788 6020 if (o->op_flags & OPf_STACKED) {
6867be6d 6021 OP *kid;
11343788
MB		 6022 o = ck_fun(o);
6023 kid = cUNOPo->op_first->op_sibling;
8990e307 6024 if (kid->op_type == OP_RV2GV)
93c66552 6025 op_null(kid);
79072805 6026 }
463ee0b2 6027 else
11343788
MB		 6028 o = listkids(o);
6029 return o;
79072805
LW		 6030}
6031
6032OP *
cea2e8a9 6033Perl_ck_exists(pTHX_ OP *o)
5f05dabc 6034{
97aff369 6035 dVAR;
5196be3e
MB		 6036 o = ck_fun(o);
6037 if (o->op_flags & OPf_KIDS) {
46c461b5 6038 OP * const kid = cUNOPo->op_first;
afebc493
GS		 6039 if (kid->op_type == OP_ENTERSUB) {
6040 (void) ref(kid, o->op_type);
6041 if (kid->op_type != OP_RV2CV && !PL_error_count)
6042 Perl_croak(aTHX_ "%s argument is not a subroutine name",
53e06cf0 6043 OP_DESC(o));
afebc493
GS		 6044 o->op_private |= OPpEXISTS_SUB;
6045 }
6046 else if (kid->op_type == OP_AELEM)
01020589
GS		 6047 o->op_flags |= OPf_SPECIAL;
6048 else if (kid->op_type != OP_HELEM)
6049 Perl_croak(aTHX_ "%s argument is not a HASH or ARRAY element",
53e06cf0 6050 OP_DESC(o));
93c66552 6051 op_null(kid);
5f05dabc 6052 }
5196be3e 6053 return o;
5f05dabc 6054}
6055
79072805 6056OP *
cea2e8a9 6057Perl_ck_rvconst(pTHX_ register OP *o)
79072805 6058{
27da23d5 6059 dVAR;
0bd48802 6060 SVOP * const kid = (SVOP*)cUNOPo->op_first;
85e6fe83 6061
3280af22 6062 o->op_private |= (PL_hints & HINT_STRICT_REFS);
e26df76a
NC		 6063 if (o->op_type == OP_RV2CV)
6064 o->op_private &= ~1;
6065
79072805 6066 if (kid->op_type == OP_CONST) {
44a8e56a 6067 int iscv;
6068 GV *gv;
504618e9 6069 SV * const kidsv = kid->op_sv;
44a8e56a 6070
779c5bc9
GS		 6071 /* Is it a constant from cv_const_sv()? */
6072 if (SvROK(kidsv) && SvREADONLY(kidsv)) {
0bd48802 6073 SV * const rsv = SvRV(kidsv);
504618e9 6074 const int svtype = SvTYPE(rsv);
bd61b366 6075 const char *badtype = NULL;
779c5bc9
GS		 6076
6077 switch (o->op_type) {
6078 case OP_RV2SV:
6079 if (svtype > SVt_PVMG)
6080 badtype = "a SCALAR";
6081 break;
6082 case OP_RV2AV:
6083 if (svtype != SVt_PVAV)
6084 badtype = "an ARRAY";
6085 break;
6086 case OP_RV2HV:
6d822dc4 6087 if (svtype != SVt_PVHV)
779c5bc9 6088 badtype = "a HASH";
779c5bc9
GS		 6089 break;
6090 case OP_RV2CV:
6091 if (svtype != SVt_PVCV)
6092 badtype = "a CODE";
6093 break;
6094 }
6095 if (badtype)
cea2e8a9 6096 Perl_croak(aTHX_ "Constant is not %s reference", badtype);
779c5bc9
GS		 6097 return o;
6098 }
ce10b5d1
RGS		 6099 else if ((o->op_type == OP_RV2HV || o->op_type == OP_RV2SV) &&
6100 (PL_hints & HINT_STRICT_REFS) && SvPOK(kidsv)) {
6101 /* If this is an access to a stash, disable "strict refs", because
6102 * stashes aren't auto-vivified at compile-time (unless we store
6103 * symbols in them), and we don't want to produce a run-time
6104 * stricture error when auto-vivifying the stash. */
6105 const char *s = SvPV_nolen(kidsv);
6106 const STRLEN l = SvCUR(kidsv);
6107 if (l > 1 && s[l-1] == ':' && s[l-2] == ':')
6108 o->op_private &= ~HINT_STRICT_REFS;
6109 }
6110 if ((o->op_private & HINT_STRICT_REFS) && (kid->op_private & OPpCONST_BARE)) {
5f66b61c 6111 const char *badthing;
5dc0d613 6112 switch (o->op_type) {
44a8e56a 6113 case OP_RV2SV:
6114 badthing = "a SCALAR";
6115 break;
6116 case OP_RV2AV:
6117 badthing = "an ARRAY";
6118 break;
6119 case OP_RV2HV:
6120 badthing = "a HASH";
6121 break;
5f66b61c
AL		 6122 default:
6123 badthing = NULL;
6124 break;
44a8e56a 6125 }
6126 if (badthing)
1c846c1f 6127 Perl_croak(aTHX_
95b63a38
JH		 6128 "Can't use bareword (\"%"SVf"\") as %s ref while \"strict refs\" in use",
6129 (void*)kidsv, badthing);
44a8e56a 6130 }
93233ece
CS		 6131 /*
6132 * This is a little tricky. We only want to add the symbol if we
6133 * didn't add it in the lexer. Otherwise we get duplicate strict
6134 * warnings. But if we didn't add it in the lexer, we must at
6135 * least pretend like we wanted to add it even if it existed before,
6136 * or we get possible typo warnings. OPpCONST_ENTERED says
6137 * whether the lexer already added THIS instance of this symbol.
6138 */
5196be3e 6139 iscv = (o->op_type == OP_RV2CV) * 2;
93233ece 6140 do {
7a5fd60d 6141 gv = gv_fetchsv(kidsv,
748a9306 6142 iscv | !(kid->op_private & OPpCONST_ENTERED),
a0d0e21e
LW		 6143 iscv
6144 ? SVt_PVCV
11343788 6145 : o->op_type == OP_RV2SV
a0d0e21e 6146 ? SVt_PV
11343788 6147 : o->op_type == OP_RV2AV
a0d0e21e 6148 ? SVt_PVAV
11343788 6149 : o->op_type == OP_RV2HV
a0d0e21e
LW		 6150 ? SVt_PVHV
6151 : SVt_PVGV);
93233ece
CS		 6152 } while (!gv && !(kid->op_private & OPpCONST_ENTERED) && !iscv++);
6153 if (gv) {
6154 kid->op_type = OP_GV;
6155 SvREFCNT_dec(kid->op_sv);
350de78d 6156#ifdef USE_ITHREADS
638eceb6 6157 /* XXX hack: dependence on sizeof(PADOP) <= sizeof(SVOP) */
350de78d 6158 kPADOP->op_padix = pad_alloc(OP_GV, SVs_PADTMP);
dd2155a4 6159 SvREFCNT_dec(PAD_SVl(kPADOP->op_padix));
743e66e6 6160 GvIN_PAD_on(gv);
b37c2d43 6161 PAD_SETSV(kPADOP->op_padix, (SV*) SvREFCNT_inc_simple_NN(gv));
350de78d 6162#else
b37c2d43 6163 kid->op_sv = SvREFCNT_inc_simple_NN(gv);
350de78d 6164#endif
23f1ca44 6165 kid->op_private = 0;
76cd736e 6166 kid->op_ppaddr = PL_ppaddr[OP_GV];
a0d0e21e 6167 }
79072805 6168 }
11343788 6169 return o;
79072805
LW		 6170}
6171
6172OP *
cea2e8a9 6173Perl_ck_ftst(pTHX_ OP *o)
79072805 6174{
27da23d5 6175 dVAR;
6867be6d 6176 const I32 type = o->op_type;
79072805 6177
d0dca557 6178 if (o->op_flags & OPf_REF) {
6f207bd3 6179 NOOP;
d0dca557
JD		 6180 }
6181 else if (o->op_flags & OPf_KIDS && cUNOPo->op_first->op_type != OP_STUB) {
551405c4 6182 SVOP * const kid = (SVOP*)cUNOPo->op_first;
1496a290 6183 const OPCODE kidtype = kid->op_type;
79072805 6184
1496a290 6185 if (kidtype == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
551405c4 6186 OP * const newop = newGVOP(type, OPf_REF,
f776e3cd 6187 gv_fetchsv(kid->op_sv, GV_ADD, SVt_PVIO));
eb8433b7
NC		 6188#ifdef PERL_MAD
6189 op_getmad(o,newop,'O');
6190#else
11343788 6191 op_free(o);
eb8433b7 6192#endif
1d866c12 6193 return newop;
79072805 6194 }
1d866c12 6195 if ((PL_hints & HINT_FILETEST_ACCESS) && OP_IS_FILETEST_ACCESS(o))
1af34c76 6196 o->op_private |= OPpFT_ACCESS;
1496a290
AL		 6197 if (PL_check[kidtype] == MEMBER_TO_FPTR(Perl_ck_ftst)
6198 && kidtype != OP_STAT && kidtype != OP_LSTAT)
fbb0b3b3 6199 o->op_private |= OPpFT_STACKED;
79072805
LW		 6200 }
6201 else {
eb8433b7 6202#ifdef PERL_MAD
1d866c12 6203 OP* const oldo = o;
eb8433b7 6204#else
11343788 6205 op_free(o);
eb8433b7 6206#endif
79072805 6207 if (type == OP_FTTTY)
8fde6460 6208 o = newGVOP(type, OPf_REF, PL_stdingv);
79072805 6209 else
d0dca557 6210 o = newUNOP(type, 0, newDEFSVOP());
eb8433b7 6211 op_getmad(oldo,o,'O');
79072805 6212 }
11343788 6213 return o;
79072805
LW		 6214}
6215
6216OP *
cea2e8a9 6217Perl_ck_fun(pTHX_ OP *o)
79072805 6218{
97aff369 6219 dVAR;
6867be6d 6220 const int type = o->op_type;
22c35a8c 6221 register I32 oa = PL_opargs[type] >> OASHIFT;
aeea060c 6222
11343788 6223 if (o->op_flags & OPf_STACKED) {
79072805
LW		 6224 if ((oa & OA_OPTIONAL) && (oa >> 4) && !((oa >> 4) & OA_OPTIONAL))
6225 oa &= ~OA_OPTIONAL;
6226 else
11343788 6227 return no_fh_allowed(o);
79072805
LW		 6228 }
6229
11343788 6230 if (o->op_flags & OPf_KIDS) {
6867be6d
AL		 6231 OP **tokid = &cLISTOPo->op_first;
6232 register OP *kid = cLISTOPo->op_first;
6233 OP *sibl;
6234 I32 numargs = 0;
6235
8990e307 6236 if (kid->op_type == OP_PUSHMARK ||
155aba94 6237 (kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK))
8990e307 6238 {
79072805
LW		 6239 tokid = &kid->op_sibling;
6240 kid = kid->op_sibling;
6241 }
22c35a8c 6242 if (!kid && PL_opargs[type] & OA_DEFGV)
54b9620d 6243 *tokid = kid = newDEFSVOP();
79072805
LW		 6244
6245 while (oa && kid) {
6246 numargs++;
6247 sibl = kid->op_sibling;
eb8433b7
NC		 6248#ifdef PERL_MAD
6249 if (!sibl && kid->op_type == OP_STUB) {
6250 numargs--;
6251 break;
6252 }
6253#endif
79072805
LW		 6254 switch (oa & 7) {
6255 case OA_SCALAR:
62c18ce2
GS		 6256 /* list seen where single (scalar) arg expected? */
6257 if (numargs == 1 && !(oa >> 4)
6258 && kid->op_type == OP_LIST && type != OP_SCALAR)
6259 {
6260 return too_many_arguments(o,PL_op_desc[type]);
6261 }
79072805
LW		 6262 scalar(kid);
6263 break;
6264 case OA_LIST:
6265 if (oa < 16) {
6266 kid = 0;
6267 continue;
6268 }
6269 else
6270 list(kid);
6271 break;
6272 case OA_AVREF:
936edb8b 6273 if ((type == OP_PUSH || type == OP_UNSHIFT)
f87c3213 6274 && !kid->op_sibling && ckWARN(WARN_SYNTAX))
9014280d 6275 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
de4864e4 6276 "Useless use of %s with no values",
936edb8b 6277 PL_op_desc[type]);
b2ffa427 6278
79072805 6279 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 6280 (kid->op_private & OPpCONST_BARE))
6281 {
551405c4 6282 OP * const newop = newAVREF(newGVOP(OP_GV, 0,
f776e3cd 6283 gv_fetchsv(((SVOP*)kid)->op_sv, GV_ADD, SVt_PVAV) ));
12bcd1a6
PM		 6284 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
6285 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
7a5fd60d 6286 "Array @%"SVf" missing the @ in argument %"IVdf" of %s()",
95b63a38 6287 (void*)((SVOP*)kid)->op_sv, (IV)numargs, PL_op_desc[type]);
eb8433b7
NC		 6288#ifdef PERL_MAD
6289 op_getmad(kid,newop,'K');
6290#else
79072805 6291 op_free(kid);
eb8433b7 6292#endif
79072805
LW		 6293 kid = newop;
6294 kid->op_sibling = sibl;
6295 *tokid = kid;
6296 }
8990e307 6297 else if (kid->op_type != OP_RV2AV && kid->op_type != OP_PADAV)
35cd451c 6298 bad_type(numargs, "array", PL_op_desc[type], kid);
a0d0e21e 6299 mod(kid, type);
79072805
LW		 6300 break;
6301 case OA_HVREF:
6302 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 6303 (kid->op_private & OPpCONST_BARE))
6304 {
551405c4 6305 OP * const newop = newHVREF(newGVOP(OP_GV, 0,
f776e3cd 6306 gv_fetchsv(((SVOP*)kid)->op_sv, GV_ADD, SVt_PVHV) ));
12bcd1a6
PM		 6307 if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX))
6308 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
7a5fd60d 6309 "Hash %%%"SVf" missing the %% in argument %"IVdf" of %s()",
95b63a38 6310 (void*)((SVOP*)kid)->op_sv, (IV)numargs, PL_op_desc[type]);
eb8433b7
NC		 6311#ifdef PERL_MAD
6312 op_getmad(kid,newop,'K');
6313#else
79072805 6314 op_free(kid);
eb8433b7 6315#endif
79072805
LW		 6316 kid = newop;
6317 kid->op_sibling = sibl;
6318 *tokid = kid;
6319 }
8990e307 6320 else if (kid->op_type != OP_RV2HV && kid->op_type != OP_PADHV)
35cd451c 6321 bad_type(numargs, "hash", PL_op_desc[type], kid);
a0d0e21e 6322 mod(kid, type);
79072805
LW		 6323 break;
6324 case OA_CVREF:
6325 {
551405c4 6326 OP * const newop = newUNOP(OP_NULL, 0, kid);
79072805
LW		 6327 kid->op_sibling = 0;
6328 linklist(kid);
6329 newop->op_next = newop;
6330 kid = newop;
6331 kid->op_sibling = sibl;
6332 *tokid = kid;
6333 }
6334 break;
6335 case OA_FILEREF:
c340be78 6336 if (kid->op_type != OP_GV && kid->op_type != OP_RV2GV) {
79072805 6337 if (kid->op_type == OP_CONST &&
62c18ce2
GS		 6338 (kid->op_private & OPpCONST_BARE))
6339 {
0bd48802 6340 OP * const newop = newGVOP(OP_GV, 0,
f776e3cd 6341 gv_fetchsv(((SVOP*)kid)->op_sv, GV_ADD, SVt_PVIO));
afbdacea 6342 if (!(o->op_private & 1) && /* if not unop */
8a996ce8 6343 kid == cLISTOPo->op_last)
364daeac 6344 cLISTOPo->op_last = newop;
eb8433b7
NC		 6345#ifdef PERL_MAD
6346 op_getmad(kid,newop,'K');
6347#else
79072805 6348 op_free(kid);
eb8433b7 6349#endif
79072805
LW		 6350 kid = newop;
6351 }
1ea32a52
GS		 6352 else if (kid->op_type == OP_READLINE) {
6353 /* neophyte patrol: open(<FH>), close(<FH>) etc. */
53e06cf0 6354 bad_type(numargs, "HANDLE", OP_DESC(o), kid);
1ea32a52 6355 }
79072805 6356 else {
35cd451c 6357 I32 flags = OPf_SPECIAL;
a6c40364 6358 I32 priv = 0;
2c8ac474
GS		 6359 PADOFFSET targ = 0;
6360
35cd451c 6361 /* is this op a FH constructor? */
853846ea 6362 if (is_handle_constructor(o,numargs)) {
bd61b366 6363 const char *name = NULL;
dd2155a4 6364 STRLEN len = 0;
2c8ac474
GS		 6365
6366 flags = 0;
6367 /* Set a flag to tell rv2gv to vivify
853846ea
NIS		 6368 * need to "prove" flag does not mean something
6369 * else already - NI-S 1999/05/07
2c8ac474
GS		 6370 */
6371 priv = OPpDEREF;
6372 if (kid->op_type == OP_PADSV) {
dd2155a4
DM		 6373 name = PAD_COMPNAME_PV(kid->op_targ);
6374 /* SvCUR of a pad namesv can't be trusted
6375 * (see PL_generation), so calc its length
6376 * manually */
6377 if (name)
6378 len = strlen(name);
6379
2c8ac474
GS		 6380 }
6381 else if (kid->op_type == OP_RV2SV
6382 && kUNOP->op_first->op_type == OP_GV)
6383 {
0bd48802 6384 GV * const gv = cGVOPx_gv(kUNOP->op_first);
2c8ac474
GS		 6385 name = GvNAME(gv);
6386 len = GvNAMELEN(gv);
6387 }
afd1915d
GS		 6388 else if (kid->op_type == OP_AELEM
6389 || kid->op_type == OP_HELEM)
6390 {
735fec84 6391 OP *firstop;
551405c4 6392 OP *op = ((BINOP*)kid)->op_first;
a4fc7abc 6393 name = NULL;
551405c4 6394 if (op) {
a0714e2c 6395 SV *tmpstr = NULL;
551405c4 6396 const char * const a =
0c4b0a3f
JH		 6397 kid->op_type == OP_AELEM ?
6398 "[]" : "{}";
6399 if (((op->op_type == OP_RV2AV) ||
6400 (op->op_type == OP_RV2HV)) &&
735fec84
RGS		 6401 (firstop = ((UNOP*)op)->op_first) &&
6402 (firstop->op_type == OP_GV)) {
0c4b0a3f 6403 /* packagevar $a[] or $h{} */
735fec84 6404 GV * const gv = cGVOPx_gv(firstop);
0c4b0a3f
JH		 6405 if (gv)
6406 tmpstr =
6407 Perl_newSVpvf(aTHX_
6408 "%s%c...%c",
6409 GvNAME(gv),
6410 a[0], a[1]);
6411 }
6412 else if (op->op_type == OP_PADAV
6413 || op->op_type == OP_PADHV) {
6414 /* lexicalvar $a[] or $h{} */
551405c4 6415 const char * const padname =
0c4b0a3f
JH		 6416 PAD_COMPNAME_PV(op->op_targ);
6417 if (padname)
6418 tmpstr =
6419 Perl_newSVpvf(aTHX_
6420 "%s%c...%c",
6421 padname + 1,
6422 a[0], a[1]);
0c4b0a3f
JH		 6423 }
6424 if (tmpstr) {
93524f2b 6425 name = SvPV_const(tmpstr, len);
0c4b0a3f
JH		 6426 sv_2mortal(tmpstr);
6427 }
6428 }
6429 if (!name) {
6430 name = "__ANONIO__";
6431 len = 10;
6432 }
6433 mod(kid, type);
afd1915d 6434 }
2c8ac474
GS		 6435 if (name) {
6436 SV *namesv;
6437 targ = pad_alloc(OP_RV2GV, SVs_PADTMP);
dd2155a4 6438 namesv = PAD_SVl(targ);
862a34c6 6439 SvUPGRADE(namesv, SVt_PV);
2c8ac474
GS		 6440 if (*name != '$')
6441 sv_setpvn(namesv, "$", 1);
6442 sv_catpvn(namesv, name, len);
6443 }
853846ea 6444 }
79072805 6445 kid->op_sibling = 0;
35cd451c 6446 kid = newUNOP(OP_RV2GV, flags, scalar(kid));
2c8ac474
GS		 6447 kid->op_targ = targ;
6448 kid->op_private |= priv;
79072805
LW		 6449 }
6450 kid->op_sibling = sibl;
6451 *tokid = kid;
6452 }
6453 scalar(kid);
6454 break;
6455 case OA_SCALARREF:
a0d0e21e 6456 mod(scalar(kid), type);
79072805
LW		 6457 break;
6458 }
6459 oa >>= 4;
6460 tokid = &kid->op_sibling;
6461 kid = kid->op_sibling;
6462 }
eb8433b7
NC		 6463#ifdef PERL_MAD
6464 if (kid && kid->op_type != OP_STUB)
6465 return too_many_arguments(o,OP_DESC(o));
6466 o->op_private |= numargs;
6467#else
6468 /* FIXME - should the numargs move as for the PERL_MAD case? */
11343788 6469 o->op_private |= numargs;
79072805 6470 if (kid)
53e06cf0 6471 return too_many_arguments(o,OP_DESC(o));
eb8433b7 6472#endif
11343788 6473 listkids(o);
79072805 6474 }
22c35a8c 6475 else if (PL_opargs[type] & OA_DEFGV) {
c56915e3 6476#ifdef PERL_MAD
c7fe699d 6477 OP *newop = newUNOP(type, 0, newDEFSVOP());
c56915e3 6478 op_getmad(o,newop,'O');
c7fe699d 6479 return newop;
c56915e3 6480#else
c7fe699d 6481 /* Ordering of these two is important to keep f_map.t passing. */
11343788 6482 op_free(o);
c7fe699d 6483 return newUNOP(type, 0, newDEFSVOP());
c56915e3 6484#endif
a0d0e21e
LW		 6485 }
6486
79072805
LW		 6487 if (oa) {
6488 while (oa & OA_OPTIONAL)
6489 oa >>= 4;
6490 if (oa && oa != OA_LIST)
53e06cf0 6491 return too_few_arguments(o,OP_DESC(o));
79072805 6492 }
11343788 6493 return o;
79072805
LW		 6494}
6495
6496OP *
cea2e8a9 6497Perl_ck_glob(pTHX_ OP *o)
79072805 6498{
27da23d5 6499 dVAR;
fb73857a 6500 GV *gv;
6501
649da076 6502 o = ck_fun(o);
1f2bfc8a 6503 if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
54b9620d 6504 append_elem(OP_GLOB, o, newDEFSVOP());
fb73857a 6505
fafc274c 6506 if (!((gv = gv_fetchpvs("glob", GV_NOTQUAL, SVt_PVCV))
b9f751c0
GS		 6507 && GvCVu(gv) && GvIMPORTED_CV(gv)))
6508 {
5c1737d1 6509 gv = gv_fetchpvs("CORE::GLOBAL::glob", 0, SVt_PVCV);
b9f751c0 6510 }
b1cb66bf 6511
52bb0670 6512#if !defined(PERL_EXTERNAL_GLOB)
72b16652 6513 /* XXX this can be tightened up and made more failsafe. */
f444d496 6514 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv))) {
7d3fb230 6515 GV *glob_gv;
72b16652 6516 ENTER;
00ca71c1 6517 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
a0714e2c 6518 newSVpvs("File::Glob"), NULL, NULL, NULL);
5c1737d1
NC		 6519 gv = gv_fetchpvs("CORE::GLOBAL::glob", 0, SVt_PVCV);
6520 glob_gv = gv_fetchpvs("File::Glob::csh_glob", 0, SVt_PVCV);
7d3fb230 6521 GvCV(gv) = GvCV(glob_gv);
b37c2d43 6522 SvREFCNT_inc_void((SV*)GvCV(gv));
7d3fb230 6523 GvIMPORTED_CV_on(gv);
72b16652
GS		 6524 LEAVE;
6525 }
52bb0670 6526#endif /* PERL_EXTERNAL_GLOB */
72b16652 6527
b9f751c0 6528 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
5196be3e 6529 append_elem(OP_GLOB, o,
80252599 6530 newSVOP(OP_CONST, 0, newSViv(PL_glob_index++)));
1f2bfc8a 6531 o->op_type = OP_LIST;
22c35a8c 6532 o->op_ppaddr = PL_ppaddr[OP_LIST];
1f2bfc8a 6533 cLISTOPo->op_first->op_type = OP_PUSHMARK;
22c35a8c 6534 cLISTOPo->op_first->op_ppaddr = PL_ppaddr[OP_PUSHMARK];
ad33f57d 6535 cLISTOPo->op_first->op_targ = 0;
1f2bfc8a 6536 o = newUNOP(OP_ENTERSUB, OPf_STACKED,
aeea060c 6537 append_elem(OP_LIST, o,
1f2bfc8a
MB		 6538 scalar(newUNOP(OP_RV2CV, 0,
6539 newGVOP(OP_GV, 0, gv)))));
d58bf5aa
MB		 6540 o = newUNOP(OP_NULL, 0, ck_subr(o));
6541 o->op_targ = OP_GLOB; /* hint at what it used to be */
6542 return o;
b1cb66bf 6543 }
6544 gv = newGVgen("main");
a0d0e21e 6545 gv_IOadd(gv);
11343788
MB		 6546 append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
6547 scalarkids(o);
649da076 6548 return o;
79072805
LW		 6549}
6550
6551OP *
cea2e8a9 6552Perl_ck_grep(pTHX_ OP *o)
79072805 6553{
27da23d5 6554 dVAR;
03ca120d 6555 LOGOP *gwop = NULL;
79072805 6556 OP *kid;
6867be6d 6557 const OPCODE type = o->op_type == OP_GREPSTART ? OP_GREPWHILE : OP_MAPWHILE;
9f7d9405 6558 PADOFFSET offset;
79072805 6559
22c35a8c 6560 o->op_ppaddr = PL_ppaddr[OP_GREPSTART];
03ca120d 6561 /* don't allocate gwop here, as we may leak it if PL_error_count > 0 */
aeea060c 6562
11343788 6563 if (o->op_flags & OPf_STACKED) {
a0d0e21e 6564 OP* k;
11343788
MB		 6565 o = ck_sort(o);
6566 kid = cLISTOPo->op_first->op_sibling;
d09ad856
BS		 6567 if (!cUNOPx(kid)->op_next)
6568 Perl_croak(aTHX_ "panic: ck_grep");
e3c9a8b9 6569 for (k = cUNOPx(kid)->op_first; k; k = k->op_next) {
a0d0e21e
LW		 6570 kid = k;
6571 }
03ca120d 6572 NewOp(1101, gwop, 1, LOGOP);
a0d0e21e 6573 kid->op_next = (OP*)gwop;
11343788 6574 o->op_flags &= ~OPf_STACKED;
93a17b20 6575 }
11343788 6576 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e
LW		 6577 if (type == OP_MAPWHILE)
6578 list(kid);
6579 else
6580 scalar(kid);
11343788 6581 o = ck_fun(o);
3280af22 6582 if (PL_error_count)
11343788 6583 return o;
aeea060c 6584 kid = cLISTOPo->op_first->op_sibling;
79072805 6585 if (kid->op_type != OP_NULL)
cea2e8a9 6586 Perl_croak(aTHX_ "panic: ck_grep");
79072805
LW		 6587 kid = kUNOP->op_first;
6588
03ca120d
MHM		 6589 if (!gwop)
6590 NewOp(1101, gwop, 1, LOGOP);
a0d0e21e 6591 gwop->op_type = type;
22c35a8c 6592 gwop->op_ppaddr = PL_ppaddr[type];
11343788 6593 gwop->op_first = listkids(o);
79072805 6594 gwop->op_flags |= OPf_KIDS;
79072805 6595 gwop->op_other = LINKLIST(kid);
79072805 6596 kid->op_next = (OP*)gwop;
59f00321 6597 offset = pad_findmy("$_");
00b1698f 6598 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS_isOUR(offset)) {
59f00321
RGS		 6599 o->op_private = gwop->op_private = 0;
6600 gwop->op_targ = pad_alloc(type, SVs_PADTMP);
6601 }
6602 else {
6603 o->op_private = gwop->op_private = OPpGREP_LEX;
6604 gwop->op_targ = o->op_targ = offset;
6605 }
79072805 6606
11343788 6607 kid = cLISTOPo->op_first->op_sibling;
a0d0e21e 6608 if (!kid || !kid->op_sibling)
53e06cf0 6609 return too_few_arguments(o,OP_DESC(o));
a0d0e21e
LW		 6610 for (kid = kid->op_sibling; kid; kid = kid->op_sibling)
6611 mod(kid, OP_GREPSTART);
6612
79072805
LW		 6613 return (OP*)gwop;
6614}
6615
6616OP *
cea2e8a9 6617Perl_ck_index(pTHX_ OP *o)
79072805 6618{
11343788
MB		 6619 if (o->op_flags & OPf_KIDS) {
6620 OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
0b71040e
LW		 6621 if (kid)
6622 kid = kid->op_sibling; /* get past "big" */
79072805 6623 if (kid && kid->op_type == OP_CONST)
2779dcf1 6624 fbm_compile(((SVOP*)kid)->op_sv, 0);
79072805 6625 }
11343788 6626 return ck_fun(o);
79072805
LW		 6627}
6628
6629OP *
cea2e8a9 6630Perl_ck_lengthconst(pTHX_ OP *o)
79072805
LW		 6631{
6632 /* XXX length optimization goes here */
11343788 6633 return ck_fun(o);
79072805
LW		 6634}
6635
6636OP *
cea2e8a9 6637Perl_ck_lfun(pTHX_ OP *o)
79072805 6638{
6867be6d 6639 const OPCODE type = o->op_type;
5dc0d613 6640 return modkids(ck_fun(o), type);
79072805
LW		 6641}
6642
6643OP *
cea2e8a9 6644Perl_ck_defined(pTHX_ OP *o) /* 19990527 MJD */
69794302 6645{
12bcd1a6 6646 if ((o->op_flags & OPf_KIDS) && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)) {
d0334bed
GS		 6647 switch (cUNOPo->op_first->op_type) {
6648 case OP_RV2AV:
a8739d98
JH		 6649 /* This is needed for
6650 if (defined %stash::)
6651 to work. Do not break Tk.
6652 */
1c846c1f 6653 break; /* Globals via GV can be undef */
d0334bed
GS		 6654 case OP_PADAV:
6655 case OP_AASSIGN: /* Is this a good idea? */
12bcd1a6 6656 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
f10b0346 6657 "defined(@array) is deprecated");
12bcd1a6 6658 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
cc507455 6659 "\t(Maybe you should just omit the defined()?)\n");
69794302 6660 break;
d0334bed 6661 case OP_RV2HV:
a8739d98
JH		 6662 /* This is needed for
6663 if (defined %stash::)
6664 to work. Do not break Tk.
6665 */
1c846c1f 6666 break; /* Globals via GV can be undef */
d0334bed 6667 case OP_PADHV:
12bcd1a6 6668 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
894356b3 6669 "defined(%%hash) is deprecated");
12bcd1a6 6670 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
cc507455 6671 "\t(Maybe you should just omit the defined()?)\n");
d0334bed
GS		 6672 break;
6673 default:
6674 /* no warning */
6675 break;
6676 }
69794302
MJD		 6677 }
6678 return ck_rfun(o);
6679}
6680
6681OP *
cea2e8a9 6682Perl_ck_rfun(pTHX_ OP *o)
8990e307 6683{
6867be6d 6684 const OPCODE type = o->op_type;
5dc0d613 6685 return refkids(ck_fun(o), type);
8990e307
LW		 6686}
6687
6688OP *
cea2e8a9 6689Perl_ck_listiob(pTHX_ OP *o)
79072805
LW		 6690{
6691 register OP *kid;
aeea060c 6692
11343788 6693 kid = cLISTOPo->op_first;
79072805 6694 if (!kid) {
11343788
MB		 6695 o = force_list(o);
6696 kid = cLISTOPo->op_first;
79072805
LW		 6697 }
6698 if (kid->op_type == OP_PUSHMARK)
6699 kid = kid->op_sibling;
11343788 6700 if (kid && o->op_flags & OPf_STACKED)
79072805
LW		 6701 kid = kid->op_sibling;
6702 else if (kid && !kid->op_sibling) { /* print HANDLE; */
6703 if (kid->op_type == OP_CONST && kid->op_private & OPpCONST_BARE) {
11343788 6704 o->op_flags |= OPf_STACKED; /* make it a filehandle */
748a9306 6705 kid = newUNOP(OP_RV2GV, OPf_REF, scalar(kid));
11343788
MB		 6706 cLISTOPo->op_first->op_sibling = kid;
6707 cLISTOPo->op_last = kid;
79072805
LW		 6708 kid = kid->op_sibling;
6709 }
6710 }
b2ffa427 6711
79072805 6712 if (!kid)
54b9620d 6713 append_elem(o->op_type, o, newDEFSVOP());
79072805 6714
2de3dbcc 6715 return listkids(o);
bbce6d69 6716}
6717
6718OP *
0d863452
RH		 6719Perl_ck_say(pTHX_ OP *o)
6720{
6721 o = ck_listiob(o);
6722 o->op_type = OP_PRINT;
6723 cLISTOPo->op_last = cLISTOPo->op_last->op_sibling
396482e1 6724 = newSVOP(OP_CONST, 0, newSVpvs("\n"));
0d863452
RH		 6725 return o;
6726}
6727
6728OP *
6729Perl_ck_smartmatch(pTHX_ OP *o)
6730{
97aff369 6731 dVAR;
0d863452
RH		 6732 if (0 == (o->op_flags & OPf_SPECIAL)) {
6733 OP *first = cBINOPo->op_first;
6734 OP *second = first->op_sibling;
6735
6736 /* Implicitly take a reference to an array or hash */
5f66b61c 6737 first->op_sibling = NULL;
0d863452
RH		 6738 first = cBINOPo->op_first = ref_array_or_hash(first);
6739 second = first->op_sibling = ref_array_or_hash(second);
6740
6741 /* Implicitly take a reference to a regular expression */
6742 if (first->op_type == OP_MATCH) {
6743 first->op_type = OP_QR;
6744 first->op_ppaddr = PL_ppaddr[OP_QR];
6745 }
6746 if (second->op_type == OP_MATCH) {
6747 second->op_type = OP_QR;
6748 second->op_ppaddr = PL_ppaddr[OP_QR];
6749 }
6750 }
6751
6752 return o;
6753}
6754
6755
6756OP *
b162f9ea
IZ		 6757Perl_ck_sassign(pTHX_ OP *o)
6758{
1496a290 6759 OP * const kid = cLISTOPo->op_first;
b162f9ea
IZ		 6760 /* has a disposable target? */
6761 if ((PL_opargs[kid->op_type] & OA_TARGLEX)
6b66af17
GS		 6762 && !(kid->op_flags & OPf_STACKED)
6763 /* Cannot steal the second time! */
6764 && !(kid->op_private & OPpTARGET_MY))
b162f9ea 6765 {
551405c4 6766 OP * const kkid = kid->op_sibling;
b162f9ea
IZ		 6767
6768 /* Can just relocate the target. */
2c2d71f5
JH		 6769 if (kkid && kkid->op_type == OP_PADSV
6770 && !(kkid->op_private & OPpLVAL_INTRO))
6771 {
b162f9ea 6772 kid->op_targ = kkid->op_targ;
743e66e6 6773 kkid->op_targ = 0;
b162f9ea
IZ		 6774 /* Now we do not need PADSV and SASSIGN. */
6775 kid->op_sibling = o->op_sibling; /* NULL */
6776 cLISTOPo->op_first = NULL;
eb8433b7
NC		 6777#ifdef PERL_MAD
6778 op_getmad(o,kid,'O');
6779 op_getmad(kkid,kid,'M');
6780#else
b162f9ea
IZ		 6781 op_free(o);
6782 op_free(kkid);
eb8433b7 6783#endif
b162f9ea
IZ		 6784 kid->op_private |= OPpTARGET_MY; /* Used for context settings */
6785 return kid;
6786 }
6787 }
952306ac
RGS		 6788 if (kid->op_sibling) {
6789 OP *kkid = kid->op_sibling;
6790 if (kkid->op_type == OP_PADSV
6791 && (kkid->op_private & OPpLVAL_INTRO)
6792 && SvPAD_STATE(*av_fetch(PL_comppad_name, kkid->op_targ, FALSE))) {
6793 o->op_private |= OPpASSIGN_STATE;
6794 /* hijacking PADSTALE for uninitialized state variables */
6795 SvPADSTALE_on(PAD_SVl(kkid->op_targ));
6796 }
6797 }
b162f9ea
IZ		 6798 return o;
6799}
6800
6801OP *
cea2e8a9 6802Perl_ck_match(pTHX_ OP *o)
79072805 6803{
97aff369 6804 dVAR;
0d863452 6805 if (o->op_type != OP_QR && PL_compcv) {
9f7d9405 6806 const PADOFFSET offset = pad_findmy("$_");
00b1698f 6807 if (offset != NOT_IN_PAD && !(PAD_COMPNAME_FLAGS_isOUR(offset))) {
59f00321
RGS		 6808 o->op_targ = offset;
6809 o->op_private |= OPpTARGET_MY;
6810 }
6811 }
6812 if (o->op_type == OP_MATCH || o->op_type == OP_QR)
6813 o->op_private |= OPpRUNTIME;
11343788 6814 return o;
79072805
LW		 6815}
6816
6817OP *
f5d5a27c
CS		 6818Perl_ck_method(pTHX_ OP *o)
6819{
551405c4 6820 OP * const kid = cUNOPo->op_first;
f5d5a27c
CS		 6821 if (kid->op_type == OP_CONST) {
6822 SV* sv = kSVOP->op_sv;
a4fc7abc
AL		 6823 const char * const method = SvPVX_const(sv);
6824 if (!(strchr(method, ':') || strchr(method, '\''))) {
f5d5a27c 6825 OP *cmop;
1c846c1f 6826 if (!SvREADONLY(sv) || !SvFAKE(sv)) {
a4fc7abc 6827 sv = newSVpvn_share(method, SvCUR(sv), 0);
1c846c1f
NIS		 6828 }
6829 else {
a0714e2c 6830 kSVOP->op_sv = NULL;
1c846c1f 6831 }
f5d5a27c 6832 cmop = newSVOP(OP_METHOD_NAMED, 0, sv);
eb8433b7
NC		 6833#ifdef PERL_MAD
6834 op_getmad(o,cmop,'O');
6835#else
f5d5a27c 6836 op_free(o);
eb8433b7 6837#endif
f5d5a27c
CS		 6838 return cmop;
6839 }
6840 }
6841 return o;
6842}
6843
6844OP *
cea2e8a9 6845Perl_ck_null(pTHX_ OP *o)
79072805 6846{
96a5add6 6847 PERL_UNUSED_CONTEXT;
11343788 6848 return o;
79072805
LW		 6849}
6850
6851OP *
16fe6d59
GS		 6852Perl_ck_open(pTHX_ OP *o)
6853{
97aff369 6854 dVAR;
551405c4 6855 HV * const table = GvHV(PL_hintgv);
16fe6d59 6856 if (table) {
a4fc7abc 6857 SV **svp = hv_fetchs(table, "open_IN", FALSE);
16fe6d59 6858 if (svp && *svp) {
551405c4 6859 const I32 mode = mode_from_discipline(*svp);
16fe6d59
GS		 6860 if (mode & O_BINARY)
6861 o->op_private |= OPpOPEN_IN_RAW;
6862 else if (mode & O_TEXT)
6863 o->op_private |= OPpOPEN_IN_CRLF;
6864 }
6865
a4fc7abc 6866 svp = hv_fetchs(table, "open_OUT", FALSE);
16fe6d59 6867 if (svp && *svp) {
551405c4 6868 const I32 mode = mode_from_discipline(*svp);
16fe6d59
GS		 6869 if (mode & O_BINARY)
6870 o->op_private |= OPpOPEN_OUT_RAW;
6871 else if (mode & O_TEXT)
6872 o->op_private |= OPpOPEN_OUT_CRLF;
6873 }
6874 }
6875 if (o->op_type == OP_BACKTICK)
6876 return o;
3b82e551
JH		 6877 {
6878 /* In case of three-arg dup open remove strictness
6879 * from the last arg if it is a bareword. */
551405c4
AL		 6880 OP * const first = cLISTOPx(o)->op_first; /* The pushmark. */
6881 OP * const last = cLISTOPx(o)->op_last; /* The bareword. */
3b82e551 6882 OP *oa;
b15aece3 6883 const char *mode;
3b82e551
JH		 6884
6885 if ((last->op_type == OP_CONST) && /* The bareword. */
6886 (last->op_private & OPpCONST_BARE) &&
6887 (last->op_private & OPpCONST_STRICT) &&
6888 (oa = first->op_sibling) && /* The fh. */
6889 (oa = oa->op_sibling) && /* The mode. */
ea1d064a 6890 (oa->op_type == OP_CONST) &&
3b82e551 6891 SvPOK(((SVOP*)oa)->op_sv) &&
b15aece3 6892 (mode = SvPVX_const(((SVOP*)oa)->op_sv)) &&
3b82e551
JH		 6893 mode[0] == '>' && mode[1] == '&' && /* A dup open. */
6894 (last == oa->op_sibling)) /* The bareword. */
6895 last->op_private &= ~OPpCONST_STRICT;
6896 }
16fe6d59
GS		 6897 return ck_fun(o);
6898}
6899
6900OP *
cea2e8a9 6901Perl_ck_repeat(pTHX_ OP *o)
79072805 6902{
11343788
MB		 6903 if (cBINOPo->op_first->op_flags & OPf_PARENS) {
6904 o->op_private |= OPpREPEAT_DOLIST;
6905 cBINOPo->op_first = force_list(cBINOPo->op_first);
79072805
LW		 6906 }
6907 else
11343788
MB		 6908 scalar(o);
6909 return o;
79072805
LW		 6910}
6911
6912OP *
cea2e8a9 6913Perl_ck_require(pTHX_ OP *o)
8990e307 6914{
97aff369 6915 dVAR;
a0714e2c 6916 GV* gv = NULL;
ec4ab249 6917
11343788 6918 if (o->op_flags & OPf_KIDS) { /* Shall we supply missing .pm? */
551405c4 6919 SVOP * const kid = (SVOP*)cUNOPo->op_first;
8990e307
LW		 6920
6921 if (kid->op_type == OP_CONST && (kid->op_private & OPpCONST_BARE)) {
551405c4 6922 SV * const sv = kid->op_sv;
5c144d81 6923 U32 was_readonly = SvREADONLY(sv);
8990e307 6924 char *s;
5c144d81
NC		 6925
6926 if (was_readonly) {
6927 if (SvFAKE(sv)) {
6928 sv_force_normal_flags(sv, 0);
6929 assert(!SvREADONLY(sv));
6930 was_readonly = 0;
6931 } else {
6932 SvREADONLY_off(sv);
6933 }
6934 }
6935
6936 for (s = SvPVX(sv); *s; s++) {
a0d0e21e 6937 if (*s == ':' && s[1] == ':') {
42d9b98d 6938 const STRLEN len = strlen(s+2)+1;
a0d0e21e 6939 *s = '/';
42d9b98d 6940 Move(s+2, s+1, len, char);
5c144d81 6941 SvCUR_set(sv, SvCUR(sv) - 1);
a0d0e21e 6942 }
8990e307 6943 }
396482e1 6944 sv_catpvs(sv, ".pm");
5c144d81 6945 SvFLAGS(sv) |= was_readonly;
8990e307
LW		 6946 }
6947 }
ec4ab249 6948
a72a1c8b
RGS		 6949 if (!(o->op_flags & OPf_SPECIAL)) { /* Wasn't written as CORE::require */
6950 /* handle override, if any */
fafc274c 6951 gv = gv_fetchpvs("require", GV_NOTQUAL, SVt_PVCV);
d6a985f2 6952 if (!(gv && GvCVu(gv) && GvIMPORTED_CV(gv))) {
a4fc7abc 6953 GV * const * const gvp = (GV**)hv_fetchs(PL_globalstash, "require", FALSE);
a0714e2c 6954 gv = gvp ? *gvp : NULL;
d6a985f2 6955 }
a72a1c8b 6956 }
ec4ab249 6957
b9f751c0 6958 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) {
551405c4 6959 OP * const kid = cUNOPo->op_first;
f11453cb
NC		 6960 OP * newop;
6961
ec4ab249 6962 cUNOPo->op_first = 0;
f11453cb 6963#ifndef PERL_MAD
ec4ab249 6964 op_free(o);
eb8433b7 6965#endif
f11453cb
NC		 6966 newop = ck_subr(newUNOP(OP_ENTERSUB, OPf_STACKED,
6967 append_elem(OP_LIST, kid,
6968 scalar(newUNOP(OP_RV2CV, 0,
6969 newGVOP(OP_GV, 0,
6970 gv))))));
6971 op_getmad(o,newop,'O');
eb8433b7 6972 return newop;
ec4ab249
GA		 6973 }
6974
11343788 6975 return ck_fun(o);
8990e307
LW		 6976}
6977
78f9721b
SM		 6978OP *
6979Perl_ck_return(pTHX_ OP *o)
6980{
97aff369 6981 dVAR;
78f9721b 6982 if (CvLVALUE(PL_compcv)) {
6867be6d 6983 OP *kid;
78f9721b
SM		 6984 for (kid = cLISTOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
6985 mod(kid, OP_LEAVESUBLV);
6986 }
6987 return o;
6988}
6989
79072805 6990OP *
cea2e8a9 6991Perl_ck_select(pTHX_ OP *o)
79072805 6992{
27da23d5 6993 dVAR;
c07a80fd 6994 OP* kid;
11343788
MB		 6995 if (o->op_flags & OPf_KIDS) {
6996 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
2304df62 6997 if (kid && kid->op_sibling) {
11343788 6998 o->op_type = OP_SSELECT;
22c35a8c 6999 o->op_ppaddr = PL_ppaddr[OP_SSELECT];
11343788
MB		 7000 o = ck_fun(o);
7001 return fold_constants(o);
79072805
LW		 7002 }
7003 }
11343788
MB		 7004 o = ck_fun(o);
7005 kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
c07a80fd 7006 if (kid && kid->op_type == OP_RV2GV)
7007 kid->op_private &= ~HINT_STRICT_REFS;
11343788 7008 return o;
79072805
LW		 7009}
7010
7011OP *
cea2e8a9 7012Perl_ck_shift(pTHX_ OP *o)
79072805 7013{
97aff369 7014 dVAR;
6867be6d 7015 const I32 type = o->op_type;
79072805 7016
11343788 7017 if (!(o->op_flags & OPf_KIDS)) {
6d4ff0d2 7018 OP *argop;
eb8433b7
NC		 7019 /* FIXME - this can be refactored to reduce code in #ifdefs */
7020#ifdef PERL_MAD
1d866c12 7021 OP * const oldo = o;
eb8433b7 7022#else
11343788 7023 op_free(o);
eb8433b7 7024#endif
6d4ff0d2 7025 argop = newUNOP(OP_RV2AV, 0,
8fde6460 7026 scalar(newGVOP(OP_GV, 0, CvUNIQUE(PL_compcv) ? PL_argvgv : PL_defgv)));
eb8433b7
NC		 7027#ifdef PERL_MAD
7028 o = newUNOP(type, 0, scalar(argop));
7029 op_getmad(oldo,o,'O');
7030 return o;
7031#else
6d4ff0d2 7032 return newUNOP(type, 0, scalar(argop));
eb8433b7 7033#endif
79072805 7034 }
11343788 7035 return scalar(modkids(ck_fun(o), type));
79072805
LW		 7036}
7037
7038OP *
cea2e8a9 7039Perl_ck_sort(pTHX_ OP *o)
79072805 7040{
97aff369 7041 dVAR;
8e3f9bdf 7042 OP *firstkid;
bbce6d69 7043
1496a290 7044 if (o->op_type == OP_SORT && (PL_hints & HINT_LOCALIZE_HH) != 0) {
a4fc7abc 7045 HV * const hinthv = GvHV(PL_hintgv);
7b9ef140 7046 if (hinthv) {
a4fc7abc 7047 SV ** const svp = hv_fetchs(hinthv, "sort", FALSE);
7b9ef140 7048 if (svp) {
a4fc7abc 7049 const I32 sorthints = (I32)SvIV(*svp);
7b9ef140
RH		 7050 if ((sorthints & HINT_SORT_QUICKSORT) != 0)
7051 o->op_private |= OPpSORT_QSORT;
7052 if ((sorthints & HINT_SORT_STABLE) != 0)
7053 o->op_private |= OPpSORT_STABLE;
7054 }
7055 }
7056 }
7057
9ea6e965 7058 if (o->op_type == OP_SORT && o->op_flags & OPf_STACKED)
51a19bc0 7059 simplify_sort(o);
8e3f9bdf
GS		 7060 firstkid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
7061 if (o->op_flags & OPf_STACKED) { /* may have been cleared */
9c5ffd7c 7062 OP *k = NULL;
8e3f9bdf 7063 OP *kid = cUNOPx(firstkid)->op_first; /* get past null */
79072805 7064
463ee0b2 7065 if (kid->op_type == OP_SCOPE || kid->op_type == OP_LEAVE) {
79072805 7066 linklist(kid);
463ee0b2
LW		 7067 if (kid->op_type == OP_SCOPE) {
7068 k = kid->op_next;
7069 kid->op_next = 0;
79072805 7070 }
463ee0b2 7071 else if (kid->op_type == OP_LEAVE) {
11343788 7072 if (o->op_type == OP_SORT) {
93c66552 7073 op_null(kid); /* wipe out leave */
748a9306 7074 kid->op_next = kid;
463ee0b2 7075
748a9306
LW		 7076 for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
7077 if (k->op_next == kid)
7078 k->op_next = 0;
71a29c3c
GS		 7079 /* don't descend into loops */
7080 else if (k->op_type == OP_ENTERLOOP
7081 || k->op_type == OP_ENTERITER)
7082 {
7083 k = cLOOPx(k)->op_lastop;
7084 }
748a9306 7085 }
463ee0b2 7086 }
748a9306
LW		 7087 else
7088 kid->op_next = 0; /* just disconnect the leave */
a0d0e21e 7089 k = kLISTOP->op_first;
463ee0b2 7090 }
a2efc822 7091 CALL_PEEP(k);
a0d0e21e 7092
8e3f9bdf
GS		 7093 kid = firstkid;
7094 if (o->op_type == OP_SORT) {
7095 /* provide scalar context for comparison function/block */
7096 kid = scalar(kid);
a0d0e21e 7097 kid->op_next = kid;
8e3f9bdf 7098 }
a0d0e21e
LW		 7099 else
7100 kid->op_next = k;
11343788 7101 o->op_flags |= OPf_SPECIAL;
79072805 7102 }
c6e96bcb 7103 else if (kid->op_type == OP_RV2SV || kid->op_type == OP_PADSV)
93c66552 7104 op_null(firstkid);
8e3f9bdf
GS		 7105
7106 firstkid = firstkid->op_sibling;
79072805 7107 }
bbce6d69 7108
8e3f9bdf
GS		 7109 /* provide list context for arguments */
7110 if (o->op_type == OP_SORT)
7111 list(firstkid);
7112
11343788 7113 return o;
79072805 7114}
bda4119b
GS		 7115
7116STATIC void
cea2e8a9 7117S_simplify_sort(pTHX_ OP *o)
9c007264 7118{
97aff369 7119 dVAR;
9c007264
JH		 7120 register OP *kid = cLISTOPo->op_first->op_sibling; /* get past pushmark */
7121 OP *k;
eb209983 7122 int descending;
350de78d 7123 GV *gv;
770526c1 7124 const char *gvname;
9c007264
JH		 7125 if (!(o->op_flags & OPf_STACKED))
7126 return;
fafc274c
NC		 7127 GvMULTI_on(gv_fetchpvs("a", GV_ADD|GV_NOTQUAL, SVt_PV));
7128 GvMULTI_on(gv_fetchpvs("b", GV_ADD|GV_NOTQUAL, SVt_PV));
82092f1d 7129 kid = kUNOP->op_first; /* get past null */
9c007264
JH		 7130 if (kid->op_type != OP_SCOPE)
7131 return;
7132 kid = kLISTOP->op_last; /* get past scope */
7133 switch(kid->op_type) {
7134 case OP_NCMP:
7135 case OP_I_NCMP:
7136 case OP_SCMP:
7137 break;
7138 default:
7139 return;
7140 }
7141 k = kid; /* remember this node*/
7142 if (kBINOP->op_first->op_type != OP_RV2SV)
7143 return;
7144 kid = kBINOP->op_first; /* get past cmp */
7145 if (kUNOP->op_first->op_type != OP_GV)
7146 return;
7147 kid = kUNOP->op_first; /* get past rv2sv */
638eceb6 7148 gv = kGVOP_gv;
350de78d 7149 if (GvSTASH(gv) != PL_curstash)
9c007264 7150 return;
770526c1
NC		 7151 gvname = GvNAME(gv);
7152 if (*gvname == 'a' && gvname[1] == '\0')
eb209983 7153 descending = 0;
770526c1 7154 else if (*gvname == 'b' && gvname[1] == '\0')
eb209983 7155 descending = 1;
9c007264
JH		 7156 else
7157 return;
eb209983 7158
9c007264
JH		 7159 kid = k; /* back to cmp */
7160 if (kBINOP->op_last->op_type != OP_RV2SV)
7161 return;
7162 kid = kBINOP->op_last; /* down to 2nd arg */
7163 if (kUNOP->op_first->op_type != OP_GV)
7164 return;
7165 kid = kUNOP->op_first; /* get past rv2sv */
638eceb6 7166 gv = kGVOP_gv;
770526c1
NC		 7167 if (GvSTASH(gv) != PL_curstash)
7168 return;
7169 gvname = GvNAME(gv);
7170 if ( descending
7171 ? !(*gvname == 'a' && gvname[1] == '\0')
7172 : !(*gvname == 'b' && gvname[1] == '\0'))
9c007264
JH		 7173 return;
7174 o->op_flags &= ~(OPf_STACKED | OPf_SPECIAL);
eb209983
NC		 7175 if (descending)
7176 o->op_private |= OPpSORT_DESCEND;
9c007264
JH		 7177 if (k->op_type == OP_NCMP)
7178 o->op_private |= OPpSORT_NUMERIC;
7179 if (k->op_type == OP_I_NCMP)
7180 o->op_private |= OPpSORT_NUMERIC | OPpSORT_INTEGER;
e507f050
SM		 7181 kid = cLISTOPo->op_first->op_sibling;
7182 cLISTOPo->op_first->op_sibling = kid->op_sibling; /* bypass old block */
eb8433b7
NC		 7183#ifdef PERL_MAD
7184 op_getmad(kid,o,'S'); /* then delete it */
7185#else
e507f050 7186 op_free(kid); /* then delete it */
eb8433b7 7187#endif
9c007264 7188}
79072805
LW		 7189
7190OP *
cea2e8a9 7191Perl_ck_split(pTHX_ OP *o)
79072805 7192{
27da23d5 7193 dVAR;
79072805 7194 register OP *kid;
aeea060c 7195
11343788
MB		 7196 if (o->op_flags & OPf_STACKED)
7197 return no_fh_allowed(o);
79072805 7198
11343788 7199 kid = cLISTOPo->op_first;
8990e307 7200 if (kid->op_type != OP_NULL)
cea2e8a9 7201 Perl_croak(aTHX_ "panic: ck_split");
8990e307 7202 kid = kid->op_sibling;
11343788
MB		 7203 op_free(cLISTOPo->op_first);
7204 cLISTOPo->op_first = kid;
85e6fe83 7205 if (!kid) {
396482e1 7206 cLISTOPo->op_first = kid = newSVOP(OP_CONST, 0, newSVpvs(" "));
11343788 7207 cLISTOPo->op_last = kid; /* There was only one element previously */
85e6fe83 7208 }
79072805 7209
de4bf5b3 7210 if (kid->op_type != OP_MATCH || kid->op_flags & OPf_STACKED) {
551405c4 7211 OP * const sibl = kid->op_sibling;
463ee0b2 7212 kid->op_sibling = 0;
131b3ad0 7213 kid = pmruntime( newPMOP(OP_MATCH, OPf_SPECIAL), kid, 0);
11343788
MB		 7214 if (cLISTOPo->op_first == cLISTOPo->op_last)
7215 cLISTOPo->op_last = kid;
7216 cLISTOPo->op_first = kid;
79072805
LW		 7217 kid->op_sibling = sibl;
7218 }
7219
7220 kid->op_type = OP_PUSHRE;
22c35a8c 7221 kid->op_ppaddr = PL_ppaddr[OP_PUSHRE];
79072805 7222 scalar(kid);
041457d9 7223 if (((PMOP *)kid)->op_pmflags & PMf_GLOBAL && ckWARN(WARN_REGEXP)) {
f34840d8
MJD		 7224 Perl_warner(aTHX_ packWARN(WARN_REGEXP),
7225 "Use of /g modifier is meaningless in split");
7226 }
79072805
LW		 7227
7228 if (!kid->op_sibling)
54b9620d 7229 append_elem(OP_SPLIT, o, newDEFSVOP());
79072805
LW		 7230
7231 kid = kid->op_sibling;
7232 scalar(kid);
7233
7234 if (!kid->op_sibling)
11343788 7235 append_elem(OP_SPLIT, o, newSVOP(OP_CONST, 0, newSViv(0)));
ce3e5c45 7236 assert(kid->op_sibling);
79072805
LW		 7237
7238 kid = kid->op_sibling;
7239 scalar(kid);
7240
7241 if (kid->op_sibling)
53e06cf0 7242 return too_many_arguments(o,OP_DESC(o));
79072805 7243
11343788 7244 return o;
79072805
LW		 7245}
7246
7247OP *
1c846c1f 7248Perl_ck_join(pTHX_ OP *o)
eb6e2d6f 7249{
551405c4 7250 const OP * const kid = cLISTOPo->op_first->op_sibling;
041457d9
DM		 7251 if (kid && kid->op_type == OP_MATCH) {
7252 if (ckWARN(WARN_SYNTAX)) {
6867be6d
AL		 7253 const REGEXP *re = PM_GETRE(kPMOP);
7254 const char *pmstr = re ? re->precomp : "STRING";
9014280d 7255 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
eb6e2d6f
GS		 7256 "/%s/ should probably be written as \"%s\"",
7257 pmstr, pmstr);
7258 }
7259 }
7260 return ck_fun(o);
7261}
7262
7263OP *
cea2e8a9 7264Perl_ck_subr(pTHX_ OP *o)
79072805 7265{
97aff369 7266 dVAR;
11343788
MB		 7267 OP *prev = ((cUNOPo->op_first->op_sibling)
7268 ? cUNOPo : ((UNOP*)cUNOPo->op_first))->op_first;
7269 OP *o2 = prev->op_sibling;
4633a7c4 7270 OP *cvop;
a0751766 7271 const char *proto = NULL;
cbf82dd0 7272 const char *proto_end = NULL;
c445ea15
AL		 7273 CV *cv = NULL;
7274 GV *namegv = NULL;
4633a7c4
LW		 7275 int optional = 0;
7276 I32 arg = 0;
5b794e05 7277 I32 contextclass = 0;
c445ea15 7278 char *e = NULL;
0723351e 7279 bool delete_op = 0;
4633a7c4 7280
d3011074 7281 o->op_private |= OPpENTERSUB_HASTARG;
11343788 7282 for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
4633a7c4
LW		 7283 if (cvop->op_type == OP_RV2CV) {
7284 SVOP* tmpop;
11343788 7285 o->op_private |= (cvop->op_private & OPpENTERSUB_AMPER);
93c66552 7286 op_null(cvop); /* disable rv2cv */
4633a7c4 7287 tmpop = (SVOP*)((UNOP*)cvop)->op_first;
76cd736e 7288 if (tmpop->op_type == OP_GV && !(o->op_private & OPpENTERSUB_AMPER)) {
638eceb6 7289 GV *gv = cGVOPx_gv(tmpop);
350de78d 7290 cv = GvCVu(gv);
76cd736e
GS		 7291 if (!cv)
7292 tmpop->op_private |= OPpEARLY_CV;
06492da6
SF		 7293 else {
7294 if (SvPOK(cv)) {
cbf82dd0 7295 STRLEN len;
06492da6 7296 namegv = CvANON(cv) ? gv : CvGV(cv);
cbf82dd0
NC		 7297 proto = SvPV((SV*)cv, len);
7298 proto_end = proto + len;
06492da6
SF		 7299 }
7300 if (CvASSERTION(cv)) {
7301 if (PL_hints & HINT_ASSERTING) {
7302 if (PERLDB_ASSERTION && PL_curstash != PL_debstash)
7303 o->op_private |= OPpENTERSUB_DB;
7304 }
8fa7688f 7305 else {
0723351e 7306 delete_op = 1;
041457d9 7307 if (!(PL_hints & HINT_ASSERTIONSSEEN) && ckWARN(WARN_ASSERTIONS)) {
8fa7688f
SF		 7308 Perl_warner(aTHX_ packWARN(WARN_ASSERTIONS),
7309 "Impossible to activate assertion call");
7310 }
7311 }
06492da6 7312 }
46fc3d4c 7313 }
4633a7c4
LW		 7314 }
7315 }
f5d5a27c 7316 else if (cvop->op_type == OP_METHOD || cvop->op_type == OP_METHOD_NAMED) {
7a52d87a
GS		 7317 if (o2->op_type == OP_CONST)
7318 o2->op_private &= ~OPpCONST_STRICT;
58a40671 7319 else if (o2->op_type == OP_LIST) {
5f66b61c
AL		 7320 OP * const sib = ((UNOP*)o2)->op_first->op_sibling;
7321 if (sib && sib->op_type == OP_CONST)
7322 sib->op_private &= ~OPpCONST_STRICT;
58a40671 7323 }
7a52d87a 7324 }
3280af22
NIS		 7325 o->op_private |= (PL_hints & HINT_STRICT_REFS);
7326 if (PERLDB_SUB && PL_curstash != PL_debstash)
11343788
MB		 7327 o->op_private |= OPpENTERSUB_DB;
7328 while (o2 != cvop) {
eb8433b7
NC		 7329 OP* o3;
7330 if (PL_madskills && o2->op_type == OP_NULL)
7331 o3 = ((UNOP*)o2)->op_first;
7332 else
7333 o3 = o2;
4633a7c4 7334 if (proto) {
cbf82dd0 7335 if (proto >= proto_end)
5dc0d613 7336 return too_many_arguments(o, gv_ename(namegv));
cbf82dd0
NC		 7337
7338 switch (*proto) {
4633a7c4
LW		 7339 case ';':
7340 optional = 1;
7341 proto++;
7342 continue;
7343 case '$':
7344 proto++;
7345 arg++;
11343788 7346 scalar(o2);
4633a7c4
LW		 7347 break;
7348 case '%':
7349 case '@':
11343788 7350 list(o2);
4633a7c4
LW		 7351 arg++;
7352 break;
7353 case '&':
7354 proto++;
7355 arg++;
eb8433b7 7356 if (o3->op_type != OP_REFGEN && o3->op_type != OP_UNDEF)
75fc29ea
GS		 7357 bad_type(arg,
7358 arg == 1 ? "block or sub {}" : "sub {}",
eb8433b7 7359 gv_ename(namegv), o3);
4633a7c4
LW		 7360 break;
7361 case '*':
2ba6ecf4 7362 /* '*' allows any scalar type, including bareword */
4633a7c4
LW		 7363 proto++;
7364 arg++;
eb8433b7 7365 if (o3->op_type == OP_RV2GV)
2ba6ecf4 7366 goto wrapref; /* autoconvert GLOB -> GLOBref */
eb8433b7
NC		 7367 else if (o3->op_type == OP_CONST)
7368 o3->op_private &= ~OPpCONST_STRICT;
7369 else if (o3->op_type == OP_ENTERSUB) {
9675f7ac 7370 /* accidental subroutine, revert to bareword */
eb8433b7 7371 OP *gvop = ((UNOP*)o3)->op_first;
9675f7ac
GS		 7372 if (gvop && gvop->op_type == OP_NULL) {
7373 gvop = ((UNOP*)gvop)->op_first;
7374 if (gvop) {
7375 for (; gvop->op_sibling; gvop = gvop->op_sibling)
7376 ;
7377 if (gvop &&
7378 (gvop->op_private & OPpENTERSUB_NOPAREN) &&
7379 (gvop = ((UNOP*)gvop)->op_first) &&
7380 gvop->op_type == OP_GV)
7381 {
551405c4
AL		 7382 GV * const gv = cGVOPx_gv(gvop);
7383 OP * const sibling = o2->op_sibling;
396482e1 7384 SV * const n = newSVpvs("");
eb8433b7 7385#ifdef PERL_MAD
1d866c12 7386 OP * const oldo2 = o2;
eb8433b7 7387#else
9675f7ac 7388 op_free(o2);
eb8433b7 7389#endif
2a797ae2 7390 gv_fullname4(n, gv, "", FALSE);
2692f720 7391 o2 = newSVOP(OP_CONST, 0, n);
eb8433b7 7392 op_getmad(oldo2,o2,'O');
9675f7ac
GS		 7393 prev->op_sibling = o2;
7394 o2->op_sibling = sibling;
7395 }
7396 }
7397 }
7398 }
2ba6ecf4
GS		 7399 scalar(o2);
7400 break;
5b794e05
JH		 7401 case '[': case ']':
7402 goto oops;
7403 break;
4633a7c4
LW		 7404 case '\\':
7405 proto++;
7406 arg++;
5b794e05 7407 again:
4633a7c4 7408 switch (*proto++) {
5b794e05
JH		 7409 case '[':
7410 if (contextclass++ == 0) {
841d93c8 7411 e = strchr(proto, ']');
5b794e05
JH		 7412 if (!e || e == proto)
7413 goto oops;
7414 }
7415 else
7416 goto oops;
7417 goto again;
7418 break;
7419 case ']':
466bafcd 7420 if (contextclass) {
a0751766
NC		 7421 const char *p = proto;
7422 const char *const end = proto;
466bafcd 7423 contextclass = 0;
466bafcd 7424 while (*--p != '[');
a0751766
NC		 7425 bad_type(arg, Perl_form(aTHX_ "one of %.*s",
7426 (int)(end - p), p),
7427 gv_ename(namegv), o3);
466bafcd 7428 } else
5b794e05
JH		 7429 goto oops;
7430 break;
4633a7c4 7431 case '*':
eb8433b7 7432 if (o3->op_type == OP_RV2GV)
5b794e05
JH		 7433 goto wrapref;
7434 if (!contextclass)
eb8433b7 7435 bad_type(arg, "symbol", gv_ename(namegv), o3);
5b794e05 7436 break;
4633a7c4 7437 case '&':
eb8433b7 7438 if (o3->op_type == OP_ENTERSUB)
5b794e05
JH		 7439 goto wrapref;
7440 if (!contextclass)
eb8433b7
NC		 7441 bad_type(arg, "subroutine entry", gv_ename(namegv),
7442 o3);
5b794e05 7443 break;
4633a7c4 7444 case '$':
eb8433b7
NC		 7445 if (o3->op_type == OP_RV2SV ||
7446 o3->op_type == OP_PADSV ||
7447 o3->op_type == OP_HELEM ||
7448 o3->op_type == OP_AELEM ||
7449 o3->op_type == OP_THREADSV)
5b794e05
JH		 7450 goto wrapref;
7451 if (!contextclass)
eb8433b7 7452 bad_type(arg, "scalar", gv_ename(namegv), o3);
5b794e05 7453 break;
4633a7c4 7454 case '@':
eb8433b7
NC		 7455 if (o3->op_type == OP_RV2AV ||
7456 o3->op_type == OP_PADAV)
5b794e05
JH		 7457 goto wrapref;
7458 if (!contextclass)
eb8433b7 7459 bad_type(arg, "array", gv_ename(namegv), o3);
5b794e05 7460 break;
4633a7c4 7461 case '%':
eb8433b7
NC		 7462 if (o3->op_type == OP_RV2HV ||
7463 o3->op_type == OP_PADHV)
5b794e05
JH		 7464 goto wrapref;
7465 if (!contextclass)
eb8433b7 7466 bad_type(arg, "hash", gv_ename(namegv), o3);
5b794e05
JH		 7467 break;
7468 wrapref:
4633a7c4 7469 {
551405c4
AL		 7470 OP* const kid = o2;
7471 OP* const sib = kid->op_sibling;
4633a7c4 7472 kid->op_sibling = 0;
6fa846a0
GS		 7473 o2 = newUNOP(OP_REFGEN, 0, kid);
7474 o2->op_sibling = sib;
e858de61 7475 prev->op_sibling = o2;
4633a7c4 7476 }
841d93c8 7477 if (contextclass && e) {
5b794e05
JH		 7478 proto = e + 1;
7479 contextclass = 0;
7480 }
4633a7c4
LW		 7481 break;
7482 default: goto oops;
7483 }
5b794e05
JH		 7484 if (contextclass)
7485 goto again;
4633a7c4 7486 break;
b1cb66bf 7487 case ' ':
7488 proto++;
7489 continue;
4633a7c4
LW		 7490 default:
7491 oops:
35c1215d 7492 Perl_croak(aTHX_ "Malformed prototype for %s: %"SVf,
95b63a38 7493 gv_ename(namegv), (void*)cv);
4633a7c4
LW		 7494 }
7495 }
7496 else
11343788
MB		 7497 list(o2);
7498 mod(o2, OP_ENTERSUB);
7499 prev = o2;
7500 o2 = o2->op_sibling;
551405c4 7501 } /* while */
cbf82dd0
NC		 7502 if (proto && !optional && proto_end > proto &&
7503 (*proto != '@' && *proto != '%' && *proto != ';'))
5dc0d613 7504 return too_few_arguments(o, gv_ename(namegv));
0723351e 7505 if(delete_op) {
eb8433b7 7506#ifdef PERL_MAD
1d866c12 7507 OP * const oldo = o;
eb8433b7 7508#else
06492da6 7509 op_free(o);
eb8433b7 7510#endif
06492da6 7511 o=newSVOP(OP_CONST, 0, newSViv(0));
eb8433b7 7512 op_getmad(oldo,o,'O');
06492da6 7513 }
11343788 7514 return o;
79072805
LW		 7515}
7516
7517OP *
cea2e8a9 7518Perl_ck_svconst(pTHX_ OP *o)
8990e307 7519{
96a5add6 7520 PERL_UNUSED_CONTEXT;
11343788
MB		 7521 SvREADONLY_on(cSVOPo->op_sv);
7522 return o;
8990e307
LW		 7523}
7524
7525OP *
d4ac975e
GA		 7526Perl_ck_chdir(pTHX_ OP *o)
7527{
7528 if (o->op_flags & OPf_KIDS) {
1496a290 7529 SVOP * const kid = (SVOP*)cUNOPo->op_first;
d4ac975e
GA		 7530
7531 if (kid && kid->op_type == OP_CONST &&
7532 (kid->op_private & OPpCONST_BARE))
7533 {
7534 o->op_flags |= OPf_SPECIAL;
7535 kid->op_private &= ~OPpCONST_STRICT;
7536 }
7537 }
7538 return ck_fun(o);
7539}
7540
7541OP *
cea2e8a9 7542Perl_ck_trunc(pTHX_ OP *o)
79072805 7543{
11343788
MB		 7544 if (o->op_flags & OPf_KIDS) {
7545 SVOP *kid = (SVOP*)cUNOPo->op_first;
79072805 7546
a0d0e21e
LW		 7547 if (kid->op_type == OP_NULL)
7548 kid = (SVOP*)kid->op_sibling;
bb53490d
GS		 7549 if (kid && kid->op_type == OP_CONST &&
7550 (kid->op_private & OPpCONST_BARE))
7551 {
11343788 7552 o->op_flags |= OPf_SPECIAL;
bb53490d
GS		 7553 kid->op_private &= ~OPpCONST_STRICT;
7554 }
79072805 7555 }
11343788 7556 return ck_fun(o);
79072805
LW		 7557}
7558
35fba0d9 7559OP *
bab9c0ac
RGS		 7560Perl_ck_unpack(pTHX_ OP *o)
7561{
7562 OP *kid = cLISTOPo->op_first;
7563 if (kid->op_sibling) {
7564 kid = kid->op_sibling;
7565 if (!kid->op_sibling)
7566 kid->op_sibling = newDEFSVOP();
7567 }
7568 return ck_fun(o);
7569}
7570
7571OP *
35fba0d9
RG		 7572Perl_ck_substr(pTHX_ OP *o)
7573{
7574 o = ck_fun(o);
1d866c12 7575 if ((o->op_flags & OPf_KIDS) && (o->op_private == 4)) {
35fba0d9
RG		 7576 OP *kid = cLISTOPo->op_first;
7577
7578 if (kid->op_type == OP_NULL)
7579 kid = kid->op_sibling;
7580 if (kid)
7581 kid->op_flags |= OPf_MOD;
7582
7583 }
7584 return o;
7585}
7586
61b743bb
DM		 7587/* A peephole optimizer. We visit the ops in the order they're to execute.
7588 * See the comments at the top of this file for more details about when
7589 * peep() is called */
463ee0b2 7590
79072805 7591void
864dbfa3 7592Perl_peep(pTHX_ register OP *o)
79072805 7593{
27da23d5 7594 dVAR;
c445ea15 7595 register OP* oldop = NULL;
2d8e6c8d 7596
2814eb74 7597 if (!o || o->op_opt)
79072805 7598 return;
a0d0e21e 7599 ENTER;
462e5cf6 7600 SAVEOP();
7766f137 7601 SAVEVPTR(PL_curcop);
a0d0e21e 7602 for (; o; o = o->op_next) {
2814eb74 7603 if (o->op_opt)
a0d0e21e 7604 break;
533c011a 7605 PL_op = o;
a0d0e21e 7606 switch (o->op_type) {
acb36ea4 7607 case OP_SETSTATE:
a0d0e21e
LW		 7608 case OP_NEXTSTATE:
7609 case OP_DBSTATE:
3280af22 7610 PL_curcop = ((COP*)o); /* for warnings */
2814eb74 7611 o->op_opt = 1;
a0d0e21e
LW		 7612 break;
7613
a0d0e21e 7614 case OP_CONST:
7a52d87a
GS		 7615 if (cSVOPo->op_private & OPpCONST_STRICT)
7616 no_bareword_allowed(o);
7766f137 7617#ifdef USE_ITHREADS
3848b962 7618 case OP_METHOD_NAMED:
7766f137
GS		 7619 /* Relocate sv to the pad for thread safety.
7620 * Despite being a "constant", the SV is written to,
7621 * for reference counts, sv_upgrade() etc. */
7622 if (cSVOP->op_sv) {
6867be6d 7623 const PADOFFSET ix = pad_alloc(OP_CONST, SVs_PADTMP);
330e22d5 7624 if (o->op_type == OP_CONST && SvPADTMP(cSVOPo->op_sv)) {
6a7129a1 7625 /* If op_sv is already a PADTMP then it is being used by
9a049f1c 7626 * some pad, so make a copy. */
dd2155a4
DM		 7627 sv_setsv(PAD_SVl(ix),cSVOPo->op_sv);
7628 SvREADONLY_on(PAD_SVl(ix));
6a7129a1
GS		 7629 SvREFCNT_dec(cSVOPo->op_sv);
7630 }
052ca17e
NC		 7631 else if (o->op_type == OP_CONST
7632 && cSVOPo->op_sv == &PL_sv_undef) {
7633 /* PL_sv_undef is hack - it's unsafe to store it in the
7634 AV that is the pad, because av_fetch treats values of
7635 PL_sv_undef as a "free" AV entry and will merrily
7636 replace them with a new SV, causing pad_alloc to think
7637 that this pad slot is free. (When, clearly, it is not)
7638 */
7639 SvOK_off(PAD_SVl(ix));
7640 SvPADTMP_on(PAD_SVl(ix));
7641 SvREADONLY_on(PAD_SVl(ix));
7642 }
6a7129a1 7643 else {
dd2155a4 7644 SvREFCNT_dec(PAD_SVl(ix));
6a7129a1 7645 SvPADTMP_on(cSVOPo->op_sv);
dd2155a4 7646 PAD_SETSV(ix, cSVOPo->op_sv);
9a049f1c 7647 /* XXX I don't know how this isn't readonly already. */
dd2155a4 7648 SvREADONLY_on(PAD_SVl(ix));
6a7129a1 7649 }
a0714e2c 7650 cSVOPo->op_sv = NULL;
7766f137
GS		 7651 o->op_targ = ix;
7652 }
7653#endif
2814eb74 7654 o->op_opt = 1;
07447971
GS		 7655 break;
7656
df91b2c5
AE		 7657 case OP_CONCAT:
7658 if (o->op_next && o->op_next->op_type == OP_STRINGIFY) {
7659 if (o->op_next->op_private & OPpTARGET_MY) {
7660 if (o->op_flags & OPf_STACKED) /* chained concats */
7661 goto ignore_optimization;
7662 else {
7663 /* assert(PL_opargs[o->op_type] & OA_TARGLEX); */
7664 o->op_targ = o->op_next->op_targ;
7665 o->op_next->op_targ = 0;
7666 o->op_private |= OPpTARGET_MY;
7667 }
7668 }
7669 op_null(o->op_next);
7670 }
7671 ignore_optimization:
2814eb74 7672 o->op_opt = 1;
df91b2c5 7673 break;
8990e307 7674 case OP_STUB:
54310121 7675 if ((o->op_flags & OPf_WANT) != OPf_WANT_LIST) {
2814eb74 7676 o->op_opt = 1;
54310121 7677 break; /* Scalar stub must produce undef. List stub is noop */
8990e307 7678 }
748a9306 7679 goto nothin;
79072805 7680 case OP_NULL:
acb36ea4
GS		 7681 if (o->op_targ == OP_NEXTSTATE
7682 || o->op_targ == OP_DBSTATE
7683 || o->op_targ == OP_SETSTATE)
7684 {
3280af22 7685 PL_curcop = ((COP*)o);
acb36ea4 7686 }
dad75012
AMS		 7687 /* XXX: We avoid setting op_seq here to prevent later calls
7688 to peep() from mistakenly concluding that optimisation
7689 has already occurred. This doesn't fix the real problem,
7690 though (See 20010220.007). AMS 20010719 */
2814eb74 7691 /* op_seq functionality is now replaced by op_opt */
dad75012
AMS		 7692 if (oldop && o->op_next) {
7693 oldop->op_next = o->op_next;
7694 continue;
7695 }
7696 break;
79072805 7697 case OP_SCALAR:
93a17b20 7698 case OP_LINESEQ:
463ee0b2 7699 case OP_SCOPE:
748a9306 7700 nothin:
a0d0e21e
LW		 7701 if (oldop && o->op_next) {
7702 oldop->op_next = o->op_next;
79072805
LW		 7703 continue;
7704 }
2814eb74 7705 o->op_opt = 1;
79072805
LW		 7706 break;
7707
6a077020 7708 case OP_PADAV:
79072805 7709 case OP_GV:
6a077020 7710 if (o->op_type == OP_PADAV || o->op_next->op_type == OP_RV2AV) {
0bd48802 7711 OP* const pop = (o->op_type == OP_PADAV) ?
6a077020 7712 o->op_next : o->op_next->op_next;
a0d0e21e 7713 IV i;
f9dc862f 7714 if (pop && pop->op_type == OP_CONST &&
af5acbb4 7715 ((PL_op = pop->op_next)) &&
8990e307 7716 pop->op_next->op_type == OP_AELEM &&
a0d0e21e 7717 !(pop->op_next->op_private &
78f9721b 7718 (OPpLVAL_INTRO|OPpLVAL_DEFER|OPpDEREF|OPpMAYBE_LVSUB)) &&
fc15ae8f 7719 (i = SvIV(((SVOP*)pop)->op_sv) - CopARYBASE_get(PL_curcop))
a0d0e21e 7720 <= 255 &&
8990e307
LW		 7721 i >= 0)
7722 {
350de78d 7723 GV *gv;
af5acbb4
DM		 7724 if (cSVOPx(pop)->op_private & OPpCONST_STRICT)
7725 no_bareword_allowed(pop);
6a077020
DM		 7726 if (o->op_type == OP_GV)
7727 op_null(o->op_next);
93c66552
DM		 7728 op_null(pop->op_next);
7729 op_null(pop);
a0d0e21e
LW		 7730 o->op_flags |= pop->op_next->op_flags & OPf_MOD;
7731 o->op_next = pop->op_next->op_next;
22c35a8c 7732 o->op_ppaddr = PL_ppaddr[OP_AELEMFAST];
a0d0e21e 7733 o->op_private = (U8)i;
6a077020
DM		 7734 if (o->op_type == OP_GV) {
7735 gv = cGVOPo_gv;
7736 GvAVn(gv);
7737 }
7738 else
7739 o->op_flags |= OPf_SPECIAL;
7740 o->op_type = OP_AELEMFAST;
7741 }
7742 o->op_opt = 1;
7743 break;
7744 }
7745
7746 if (o->op_next->op_type == OP_RV2SV) {
7747 if (!(o->op_next->op_private & OPpDEREF)) {
7748 op_null(o->op_next);
7749 o->op_private |= o->op_next->op_private & (OPpLVAL_INTRO
7750 | OPpOUR_INTRO);
7751 o->op_next = o->op_next->op_next;
7752 o->op_type = OP_GVSV;
7753 o->op_ppaddr = PL_ppaddr[OP_GVSV];
8990e307 7754 }
79072805 7755 }
e476b1b5 7756 else if ((o->op_private & OPpEARLY_CV) && ckWARN(WARN_PROTOTYPE)) {
551405c4 7757 GV * const gv = cGVOPo_gv;
b15aece3 7758 if (SvTYPE(gv) == SVt_PVGV && GvCV(gv) && SvPVX_const(GvCV(gv))) {
76cd736e 7759 /* XXX could check prototype here instead of just carping */
551405c4 7760 SV * const sv = sv_newmortal();
bd61b366 7761 gv_efullname3(sv, gv, NULL);
9014280d 7762 Perl_warner(aTHX_ packWARN(WARN_PROTOTYPE),
35c1215d 7763 "%"SVf"() called too early to check prototype",
95b63a38 7764 (void*)sv);
76cd736e
GS		 7765 }
7766 }
89de2904
AMS		 7767 else if (o->op_next->op_type == OP_READLINE
7768 && o->op_next->op_next->op_type == OP_CONCAT
7769 && (o->op_next->op_next->op_flags & OPf_STACKED))
7770 {
d2c45030
AMS		 7771 /* Turn "$a .= <FH>" into an OP_RCATLINE. AMS 20010917 */
7772 o->op_type = OP_RCATLINE;
7773 o->op_flags |= OPf_STACKED;
7774 o->op_ppaddr = PL_ppaddr[OP_RCATLINE];
89de2904 7775 op_null(o->op_next->op_next);
d2c45030 7776 op_null(o->op_next);
89de2904 7777 }
76cd736e 7778
2814eb74 7779 o->op_opt = 1;
79072805
LW		 7780 break;
7781
a0d0e21e 7782 case OP_MAPWHILE:
79072805
LW		 7783 case OP_GREPWHILE:
7784 case OP_AND:
7785 case OP_OR:
c963b151 7786 case OP_DOR:
2c2d71f5
JH		 7787 case OP_ANDASSIGN:
7788 case OP_ORASSIGN:
c963b151 7789 case OP_DORASSIGN:
1a67a97c
SM		 7790 case OP_COND_EXPR:
7791 case OP_RANGE:
2814eb74 7792 o->op_opt = 1;
fd4d1407
IZ		 7793 while (cLOGOP->op_other->op_type == OP_NULL)
7794 cLOGOP->op_other = cLOGOP->op_other->op_next;
a2efc822 7795 peep(cLOGOP->op_other); /* Recursive calls are not replaced by fptr calls */
79072805
LW		 7796 break;
7797
79072805 7798 case OP_ENTERLOOP:
9c2ca71a 7799 case OP_ENTERITER:
2814eb74 7800 o->op_opt = 1;
58cccf98
SM		 7801 while (cLOOP->op_redoop->op_type == OP_NULL)
7802 cLOOP->op_redoop = cLOOP->op_redoop->op_next;
79072805 7803 peep(cLOOP->op_redoop);
58cccf98
SM		 7804 while (cLOOP->op_nextop->op_type == OP_NULL)
7805 cLOOP->op_nextop = cLOOP->op_nextop->op_next;
79072805 7806 peep(cLOOP->op_nextop);
58cccf98
SM		 7807 while (cLOOP->op_lastop->op_type == OP_NULL)
7808 cLOOP->op_lastop = cLOOP->op_lastop->op_next;
79072805
LW		 7809 peep(cLOOP->op_lastop);
7810 break;
7811
8782bef2 7812 case OP_QR:
79072805
LW		 7813 case OP_MATCH:
7814 case OP_SUBST:
2814eb74 7815 o->op_opt = 1;
9041c2e3 7816 while (cPMOP->op_pmreplstart &&
58cccf98
SM		 7817 cPMOP->op_pmreplstart->op_type == OP_NULL)
7818 cPMOP->op_pmreplstart = cPMOP->op_pmreplstart->op_next;
a0d0e21e 7819 peep(cPMOP->op_pmreplstart);
79072805
LW		 7820 break;
7821
a0d0e21e 7822 case OP_EXEC:
2814eb74 7823 o->op_opt = 1;
041457d9
DM		 7824 if (o->op_next && o->op_next->op_type == OP_NEXTSTATE
7825 && ckWARN(WARN_SYNTAX))
7826 {
1496a290
AL		 7827 if (o->op_next->op_sibling) {
7828 const OPCODE type = o->op_next->op_sibling->op_type;
7829 if (type != OP_EXIT && type != OP_WARN && type != OP_DIE) {
7830 const line_t oldline = CopLINE(PL_curcop);
7831 CopLINE_set(PL_curcop, CopLINE((COP*)o->op_next));
7832 Perl_warner(aTHX_ packWARN(WARN_EXEC),
7833 "Statement unlikely to be reached");
7834 Perl_warner(aTHX_ packWARN(WARN_EXEC),
7835 "\t(Maybe you meant system() when you said exec()?)\n");
7836 CopLINE_set(PL_curcop, oldline);
7837 }
a0d0e21e
LW		 7838 }
7839 }
7840 break;
b2ffa427 7841
c750a3ec 7842 case OP_HELEM: {
e75d1f10 7843 UNOP *rop;
6d822dc4 7844 SV *lexname;
e75d1f10 7845 GV **fields;
6d822dc4 7846 SV **svp, *sv;
d5263905 7847 const char *key = NULL;
c750a3ec 7848 STRLEN keylen;
b2ffa427 7849
2814eb74 7850 o->op_opt = 1;
1c846c1f
NIS		 7851
7852 if (((BINOP*)o)->op_last->op_type != OP_CONST)
c750a3ec 7853 break;
1c846c1f
NIS		 7854
7855 /* Make the CONST have a shared SV */
7856 svp = cSVOPx_svp(((BINOP*)o)->op_last);
3049cdab 7857 if ((!SvFAKE(sv = *svp) || !SvREADONLY(sv)) && !IS_PADCONST(sv)) {
d5263905 7858 key = SvPV_const(sv, keylen);
25716404 7859 lexname = newSVpvn_share(key,
bb7a0f54 7860 SvUTF8(sv) ? -(I32)keylen : (I32)keylen,
25716404 7861 0);
1c846c1f
NIS		 7862 SvREFCNT_dec(sv);
7863 *svp = lexname;
7864 }
e75d1f10
RD		 7865
7866 if ((o->op_private & (OPpLVAL_INTRO)))
7867 break;
7868
7869 rop = (UNOP*)((BINOP*)o)->op_first;
7870 if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
7871 break;
7872 lexname = *av_fetch(PL_comppad_name, rop->op_first->op_targ, TRUE);
00b1698f 7873 if (!SvPAD_TYPED(lexname))
e75d1f10 7874 break;
a4fc7abc 7875 fields = (GV**)hv_fetchs(SvSTASH(lexname), "FIELDS", FALSE);
e75d1f10
RD		 7876 if (!fields || !GvHV(*fields))
7877 break;
93524f2b 7878 key = SvPV_const(*svp, keylen);
e75d1f10 7879 if (!hv_fetch(GvHV(*fields), key,
bb7a0f54 7880 SvUTF8(*svp) ? -(I32)keylen : (I32)keylen, FALSE))
e75d1f10
RD		 7881 {
7882 Perl_croak(aTHX_ "No such class field \"%s\" "
7883 "in variable %s of type %s",
93524f2b 7884 key, SvPV_nolen_const(lexname), HvNAME_get(SvSTASH(lexname)));
e75d1f10
RD		 7885 }
7886
6d822dc4
MS		 7887 break;
7888 }
c750a3ec 7889
e75d1f10
RD		 7890 case OP_HSLICE: {
7891 UNOP *rop;
7892 SV *lexname;
7893 GV **fields;
7894 SV **svp;
93524f2b 7895 const char *key;
e75d1f10
RD		 7896 STRLEN keylen;
7897 SVOP *first_key_op, *key_op;
7898
7899 if ((o->op_private & (OPpLVAL_INTRO))
7900 /* I bet there's always a pushmark... */
7901 || ((LISTOP*)o)->op_first->op_sibling->op_type != OP_LIST)
7902 /* hmmm, no optimization if list contains only one key. */
7903 break;
7904 rop = (UNOP*)((LISTOP*)o)->op_last;
7905 if (rop->op_type != OP_RV2HV)
7906 break;
7907 if (rop->op_first->op_type == OP_PADSV)
7908 /* @$hash{qw(keys here)} */
7909 rop = (UNOP*)rop->op_first;
7910 else {
7911 /* @{$hash}{qw(keys here)} */
7912 if (rop->op_first->op_type == OP_SCOPE
7913 && cLISTOPx(rop->op_first)->op_last->op_type == OP_PADSV)
7914 {
7915 rop = (UNOP*)cLISTOPx(rop->op_first)->op_last;
7916 }
7917 else
7918 break;
7919 }
7920
7921 lexname = *av_fetch(PL_comppad_name, rop->op_targ, TRUE);
00b1698f 7922 if (!SvPAD_TYPED(lexname))
e75d1f10 7923 break;
a4fc7abc 7924 fields = (GV**)hv_fetchs(SvSTASH(lexname), "FIELDS", FALSE);
e75d1f10
RD		 7925 if (!fields || !GvHV(*fields))
7926 break;
7927 /* Again guessing that the pushmark can be jumped over.... */
7928 first_key_op = (SVOP*)((LISTOP*)((LISTOP*)o)->op_first->op_sibling)
7929 ->op_first->op_sibling;
7930 for (key_op = first_key_op; key_op;
7931 key_op = (SVOP*)key_op->op_sibling) {
7932 if (key_op->op_type != OP_CONST)
7933 continue;
7934 svp = cSVOPx_svp(key_op);
93524f2b 7935 key = SvPV_const(*svp, keylen);
e75d1f10 7936 if (!hv_fetch(GvHV(*fields), key,
bb7a0f54 7937 SvUTF8(*svp) ? -(I32)keylen : (I32)keylen, FALSE))
e75d1f10
RD		 7938 {
7939 Perl_croak(aTHX_ "No such class field \"%s\" "
7940 "in variable %s of type %s",
bfcb3514 7941 key, SvPV_nolen(lexname), HvNAME_get(SvSTASH(lexname)));
e75d1f10
RD		 7942 }
7943 }
7944 break;
7945 }
7946
fe1bc4cf 7947 case OP_SORT: {
fe1bc4cf 7948 /* will point to RV2AV or PADAV op on LHS/RHS of assign */
551405c4 7949 OP *oleft;
fe1bc4cf
DM		 7950 OP *o2;
7951
fe1bc4cf 7952 /* check that RHS of sort is a single plain array */
551405c4 7953 OP *oright = cUNOPo->op_first;
fe1bc4cf
DM		 7954 if (!oright || oright->op_type != OP_PUSHMARK)
7955 break;
471178c0
NC		 7956
7957 /* reverse sort ... can be optimised. */
7958 if (!cUNOPo->op_sibling) {
7959 /* Nothing follows us on the list. */
551405c4 7960 OP * const reverse = o->op_next;
471178c0
NC		 7961
7962 if (reverse->op_type == OP_REVERSE &&
7963 (reverse->op_flags & OPf_WANT) == OPf_WANT_LIST) {
551405c4 7964 OP * const pushmark = cUNOPx(reverse)->op_first;
471178c0
NC		 7965 if (pushmark && (pushmark->op_type == OP_PUSHMARK)
7966 && (cUNOPx(pushmark)->op_sibling == o)) {
7967 /* reverse -> pushmark -> sort */
7968 o->op_private |= OPpSORT_REVERSE;
7969 op_null(reverse);
7970 pushmark->op_next = oright->op_next;
7971 op_null(oright);
7972 }
7973 }
7974 }
7975
7976 /* make @a = sort @a act in-place */
7977
7978 o->op_opt = 1;
7979
fe1bc4cf
DM		 7980 oright = cUNOPx(oright)->op_sibling;
7981 if (!oright)
7982 break;
7983 if (oright->op_type == OP_NULL) { /* skip sort block/sub */
7984 oright = cUNOPx(oright)->op_sibling;
7985 }
7986
7987 if (!oright ||
7988 (oright->op_type != OP_RV2AV && oright->op_type != OP_PADAV)
7989 || oright->op_next != o
7990 || (oright->op_private & OPpLVAL_INTRO)
7991 )
7992 break;
7993
7994 /* o2 follows the chain of op_nexts through the LHS of the
7995 * assign (if any) to the aassign op itself */
7996 o2 = o->op_next;
7997 if (!o2 || o2->op_type != OP_NULL)
7998 break;
7999 o2 = o2->op_next;
8000 if (!o2 || o2->op_type != OP_PUSHMARK)
8001 break;
8002 o2 = o2->op_next;
8003 if (o2 && o2->op_type == OP_GV)
8004 o2 = o2->op_next;
8005 if (!o2
8006 || (o2->op_type != OP_PADAV && o2->op_type != OP_RV2AV)
8007 || (o2->op_private & OPpLVAL_INTRO)
8008 )
8009 break;
8010 oleft = o2;
8011 o2 = o2->op_next;
8012 if (!o2 || o2->op_type != OP_NULL)
8013 break;
8014 o2 = o2->op_next;
8015 if (!o2 || o2->op_type != OP_AASSIGN
8016 || (o2->op_flags & OPf_WANT) != OPf_WANT_VOID)
8017 break;
8018
db7511db
DM		 8019 /* check that the sort is the first arg on RHS of assign */
8020
8021 o2 = cUNOPx(o2)->op_first;
8022 if (!o2 || o2->op_type != OP_NULL)
8023 break;
8024 o2 = cUNOPx(o2)->op_first;
8025 if (!o2 || o2->op_type != OP_PUSHMARK)
8026 break;
8027 if (o2->op_sibling != o)
8028 break;
8029
fe1bc4cf
DM		 8030 /* check the array is the same on both sides */
8031 if (oleft->op_type == OP_RV2AV) {
8032 if (oright->op_type != OP_RV2AV
8033 || !cUNOPx(oright)->op_first
8034 || cUNOPx(oright)->op_first->op_type != OP_GV
8035 || cGVOPx_gv(cUNOPx(oleft)->op_first) !=
8036 cGVOPx_gv(cUNOPx(oright)->op_first)
8037 )
8038 break;
8039 }
8040 else if (oright->op_type != OP_PADAV
8041 || oright->op_targ != oleft->op_targ
8042 )
8043 break;
8044
8045 /* transfer MODishness etc from LHS arg to RHS arg */
8046 oright->op_flags = oleft->op_flags;
8047 o->op_private |= OPpSORT_INPLACE;
8048
8049 /* excise push->gv->rv2av->null->aassign */
8050 o2 = o->op_next->op_next;
8051 op_null(o2); /* PUSHMARK */
8052 o2 = o2->op_next;
8053 if (o2->op_type == OP_GV) {
8054 op_null(o2); /* GV */
8055 o2 = o2->op_next;
8056 }
8057 op_null(o2); /* RV2AV or PADAV */
8058 o2 = o2->op_next->op_next;
8059 op_null(o2); /* AASSIGN */
8060
8061 o->op_next = o2->op_next;
8062
8063 break;
8064 }
ef3e5ea9
NC		 8065
8066 case OP_REVERSE: {
e682d7b7 8067 OP *ourmark, *theirmark, *ourlast, *iter, *expushmark, *rv2av;
ce335f37 8068 OP *gvop = NULL;
ef3e5ea9
NC		 8069 LISTOP *enter, *exlist;
8070 o->op_opt = 1;
8071
8072 enter = (LISTOP *) o->op_next;
8073 if (!enter)
8074 break;
8075 if (enter->op_type == OP_NULL) {
8076 enter = (LISTOP *) enter->op_next;
8077 if (!enter)
8078 break;
8079 }
d46f46af
NC		 8080 /* for $a (...) will have OP_GV then OP_RV2GV here.
8081 for (...) just has an OP_GV. */
ce335f37
NC		 8082 if (enter->op_type == OP_GV) {
8083 gvop = (OP *) enter;
8084 enter = (LISTOP *) enter->op_next;
8085 if (!enter)
8086 break;
d46f46af
NC		 8087 if (enter->op_type == OP_RV2GV) {
8088 enter = (LISTOP *) enter->op_next;
8089 if (!enter)
ce335f37 8090 break;
d46f46af 8091 }
ce335f37
NC		 8092 }
8093
ef3e5ea9
NC		 8094 if (enter->op_type != OP_ENTERITER)
8095 break;
8096
8097 iter = enter->op_next;
8098 if (!iter || iter->op_type != OP_ITER)
8099 break;
8100
ce335f37
NC		 8101 expushmark = enter->op_first;
8102 if (!expushmark || expushmark->op_type != OP_NULL
8103 || expushmark->op_targ != OP_PUSHMARK)
8104 break;
8105
8106 exlist = (LISTOP *) expushmark->op_sibling;
ef3e5ea9
NC		 8107 if (!exlist || exlist->op_type != OP_NULL
8108 || exlist->op_targ != OP_LIST)
8109 break;
8110
8111 if (exlist->op_last != o) {
8112 /* Mmm. Was expecting to point back to this op. */
8113 break;
8114 }
8115 theirmark = exlist->op_first;
8116 if (!theirmark || theirmark->op_type != OP_PUSHMARK)
8117 break;
8118
c491ecac 8119 if (theirmark->op_sibling != o) {
ef3e5ea9
NC		 8120 /* There's something between the mark and the reverse, eg
8121 for (1, reverse (...))
8122 so no go. */
8123 break;
8124 }
8125
c491ecac
NC		 8126 ourmark = ((LISTOP *)o)->op_first;
8127 if (!ourmark || ourmark->op_type != OP_PUSHMARK)
8128 break;
8129
ef3e5ea9
NC		 8130 ourlast = ((LISTOP *)o)->op_last;
8131 if (!ourlast || ourlast->op_next != o)
8132 break;
8133
e682d7b7
NC		 8134 rv2av = ourmark->op_sibling;
8135 if (rv2av && rv2av->op_type == OP_RV2AV && rv2av->op_sibling == 0
8136 && rv2av->op_flags == (OPf_WANT_LIST | OPf_KIDS)
8137 && enter->op_flags == (OPf_WANT_LIST | OPf_KIDS)) {
8138 /* We're just reversing a single array. */
8139 rv2av->op_flags = OPf_WANT_SCALAR | OPf_KIDS | OPf_REF;
8140 enter->op_flags |= OPf_STACKED;
8141 }
8142
ef3e5ea9
NC		 8143 /* We don't have control over who points to theirmark, so sacrifice
8144 ours. */
8145 theirmark->op_next = ourmark->op_next;
8146 theirmark->op_flags = ourmark->op_flags;
ce335f37 8147 ourlast->op_next = gvop ? gvop : (OP *) enter;
ef3e5ea9
NC		 8148 op_null(ourmark);
8149 op_null(o);
8150 enter->op_private |= OPpITER_REVERSED;
8151 iter->op_private |= OPpITER_REVERSED;
8152
8153 break;
8154 }
e26df76a
NC		 8155
8156 case OP_SASSIGN: {
8157 OP *rv2gv;
8158 UNOP *refgen, *rv2cv;
8159 LISTOP *exlist;
8160
8161 /* I do not understand this, but if o->op_opt isn't set to 1,
8162 various tests in ext/B/t/bytecode.t fail with no readily
8163 apparent cause. */
8164
8165 o->op_opt = 1;
8166
de3370bc
NC		 8167
8168 if ((o->op_flags && OPf_WANT) != OPf_WANT_VOID)
8169 break;
8170
e26df76a
NC		 8171 if ((o->op_private & ~OPpASSIGN_BACKWARDS) != 2)
8172 break;
8173
8174 rv2gv = ((BINOP *)o)->op_last;
8175 if (!rv2gv || rv2gv->op_type != OP_RV2GV)
8176 break;
8177
8178 refgen = (UNOP *)((BINOP *)o)->op_first;
8179
8180 if (!refgen || refgen->op_type != OP_REFGEN)
8181 break;
8182
8183 exlist = (LISTOP *)refgen->op_first;
8184 if (!exlist || exlist->op_type != OP_NULL
8185 || exlist->op_targ != OP_LIST)
8186 break;
8187
8188 if (exlist->op_first->op_type != OP_PUSHMARK)
8189 break;
8190
8191 rv2cv = (UNOP*)exlist->op_last;
8192
8193 if (rv2cv->op_type != OP_RV2CV)
8194 break;
8195
8196 assert ((rv2gv->op_private & OPpDONT_INIT_GV) == 0);
8197 assert ((o->op_private & OPpASSIGN_CV_TO_GV) == 0);
8198 assert ((rv2cv->op_private & OPpMAY_RETURN_CONSTANT) == 0);
8199
8200 o->op_private |= OPpASSIGN_CV_TO_GV;
8201 rv2gv->op_private |= OPpDONT_INIT_GV;
8202 rv2cv->op_private |= OPpMAY_RETURN_CONSTANT;
8203
8204 break;
8205 }
8206
fe1bc4cf 8207
79072805 8208 default:
2814eb74 8209 o->op_opt = 1;
79072805
LW		 8210 break;
8211 }
a0d0e21e 8212 oldop = o;
79072805 8213 }
a0d0e21e 8214 LEAVE;
79072805 8215}
beab0874 8216
1cb0ed9b
RGS		 8217char*
8218Perl_custom_op_name(pTHX_ const OP* o)
53e06cf0 8219{
97aff369 8220 dVAR;
e1ec3a88 8221 const IV index = PTR2IV(o->op_ppaddr);
53e06cf0
SC		 8222 SV* keysv;
8223 HE* he;
8224
8225 if (!PL_custom_op_names) /* This probably shouldn't happen */
27da23d5 8226 return (char *)PL_op_name[OP_CUSTOM];
53e06cf0
SC		 8227
8228 keysv = sv_2mortal(newSViv(index));
8229
8230 he = hv_fetch_ent(PL_custom_op_names, keysv, 0, 0);
8231 if (!he)
27da23d5 8232 return (char *)PL_op_name[OP_CUSTOM]; /* Don't know who you are */
53e06cf0
SC		 8233
8234 return SvPV_nolen(HeVAL(he));
8235}
8236
1cb0ed9b
RGS		 8237char*
8238Perl_custom_op_desc(pTHX_ const OP* o)
53e06cf0 8239{
97aff369 8240 dVAR;
e1ec3a88 8241 const IV index = PTR2IV(o->op_ppaddr);
53e06cf0
SC		 8242 SV* keysv;
8243 HE* he;
8244
8245 if (!PL_custom_op_descs)
27da23d5 8246 return (char *)PL_op_desc[OP_CUSTOM];
53e06cf0
SC		 8247
8248 keysv = sv_2mortal(newSViv(index));
8249
8250 he = hv_fetch_ent(PL_custom_op_descs, keysv, 0, 0);
8251 if (!he)
27da23d5 8252 return (char *)PL_op_desc[OP_CUSTOM];
53e06cf0
SC		 8253
8254 return SvPV_nolen(HeVAL(he));
8255}
19e8ce8e 8256
beab0874
JT		 8257#include "XSUB.h"
8258
8259/* Efficient sub that returns a constant scalar value. */
8260static void
acfe0abc 8261const_sv_xsub(pTHX_ CV* cv)
beab0874 8262{
97aff369 8263 dVAR;
beab0874 8264 dXSARGS;
9cbac4c7 8265 if (items != 0) {
6f207bd3 8266 NOOP;
9cbac4c7
DM		 8267#if 0
8268 Perl_croak(aTHX_ "usage: %s::%s()",
bfcb3514 8269 HvNAME_get(GvSTASH(CvGV(cv))), GvNAME(CvGV(cv)));
9cbac4c7
DM		 8270#endif
8271 }
9a049f1c 8272 EXTEND(sp, 1);
0768512c 8273 ST(0) = (SV*)XSANY.any_ptr;
beab0874
JT		 8274 XSRETURN(1);
8275}
4946a0fa
NC		 8276
8277/*
8278 * Local variables:
8279 * c-indentation-style: bsd
8280 * c-basic-offset: 4
8281 * indent-tabs-mode: t
8282 * End:
8283 *
37442d52
RGS		 8284 * ex: set ts=8 sts=4 sw=4 noet:
8285 */
Unnamed repository; edit this file 'description' to name the repository.