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[perl5.git] / op.c
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a0d0e21e 1/* op.c
79072805 2 *
4bb101f2 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
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.
92 C<Perl_magic_sethint> updates C<PL_compiling.cop_hints> with a store
93 record, with deletes written by C<Perl_magic_clearhint>. C<SAVE_HINTS>
94 saves the current C<PL_compiling.cop_hints> on the save stack, so that it
95 will be correctly restored when any inner compiling scope is exited.
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
NC		 226 "Bareword \"%"SVf"\" not allowed while \"strict subs\" in use",
227 cSVOPo_sv));
7a52d87a
GS		 228}
229
79072805
LW		 230/* "register" allocation */
231
232PADOFFSET
dd2155a4 233Perl_allocmy(pTHX_ char *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])) {
2b92dfce
GS		 248 /* 1999-02-27 mjd@plover.com */
249 char *p;
250 p = strchr(name, '\0');
251 /* The next block assumes the buffer is at least 205 chars
252 long. At present, it's always at least 256 chars. */
253 if (p-name > 200) {
254 strcpy(name+200, "...");
255 p = name+199;
256 }
257 else {
258 p[1] = '\0';
259 }
260 /* Move everything else down one character */
261 for (; p-name > 2; p--)
262 *p = *(p-1);
46fc3d4c 263 name[2] = toCTRL(name[1]);
264 name[1] = '^';
265 }
cea2e8a9 266 yyerror(Perl_form(aTHX_ "Can't use global %s in \"my\"",name));
a0d0e21e 267 }
748a9306 268
dd2155a4 269 /* check for duplicate declaration */
3edf23ff 270 pad_check_dup(name, is_our, (PL_curstash ? PL_curstash : PL_defstash));
33b8ce05 271
dd2155a4
DM		 272 if (PL_in_my_stash && *name != '$') {
273 yyerror(Perl_form(aTHX_
274 "Can't declare class for non-scalar %s in \"%s\"",
3edf23ff 275 name, is_our ? "our" : "my"));
6b35e009
GS		 276 }
277
dd2155a4 278 /* allocate a spare slot and store the name in that slot */
93a17b20 279
dd2155a4
DM		 280 off = pad_add_name(name,
281 PL_in_my_stash,
3edf23ff 282 (is_our
133706a6
RGS		 283 /* $_ is always in main::, even with our */
284 ? (PL_curstash && !strEQ(name,"$_") ? PL_curstash : PL_defstash)
5c284bb0 285 : NULL
dd2155a4
DM		 286 ),
287 0 /* not fake */
288 );
289 return off;
79072805
LW		 290}
291
79072805
LW		 292/* Destructor */
293
294void
864dbfa3 295Perl_op_free(pTHX_ OP *o)
79072805 296{
27da23d5 297 dVAR;
acb36ea4 298 OPCODE type;
79072805 299
2814eb74 300 if (!o || o->op_static)
79072805
LW		 301 return;
302
67566ccd 303 type = o->op_type;
7934575e 304 if (o->op_private & OPpREFCOUNTED) {
67566ccd 305 switch (type) {
7934575e
GS		 306 case OP_LEAVESUB:
307 case OP_LEAVESUBLV:
308 case OP_LEAVEEVAL:
309 case OP_LEAVE:
310 case OP_SCOPE:
311 case OP_LEAVEWRITE:
67566ccd
AL		 312 {
313 PADOFFSET refcnt;
7934575e 314 OP_REFCNT_LOCK;
4026c95a 315 refcnt = OpREFCNT_dec(o);
7934575e 316 OP_REFCNT_UNLOCK;
4026c95a
SH		 317 if (refcnt)
318 return;
67566ccd 319 }
7934575e
GS		 320 break;
321 default:
322 break;
323 }
324 }
325
11343788 326 if (o->op_flags & OPf_KIDS) {
6867be6d 327 register OP *kid, *nextkid;
11343788 328 for (kid = cUNOPo->op_first; kid; kid = nextkid) {
85e6fe83 329 nextkid = kid->op_sibling; /* Get before next freeing kid */
79072805 330 op_free(kid);
85e6fe83 331 }
79072805 332 }
acb36ea4 333 if (type == OP_NULL)
eb160463 334 type = (OPCODE)o->op_targ;
acb36ea4
GS		 335
336 /* COP* is not cleared by op_clear() so that we may track line
337 * numbers etc even after null() */
338 if (type == OP_NEXTSTATE || type == OP_SETSTATE || type == OP_DBSTATE)
339 cop_free((COP*)o);
340
341 op_clear(o);
238a4c30 342 FreeOp(o);
4d494880
DM		 343#ifdef DEBUG_LEAKING_SCALARS
344 if (PL_op == o)
5f66b61c 345 PL_op = NULL;
4d494880 346#endif
acb36ea4 347}
79072805 348
93c66552
DM		 349void
350Perl_op_clear(pTHX_ OP *o)
acb36ea4 351{
13137afc 352
27da23d5 353 dVAR;
eb8433b7
NC		 354#ifdef PERL_MAD
355 /* if (o->op_madprop && o->op_madprop->mad_next)
356 abort(); */
3cc8d589
NC		 357 /* FIXME for MAD - if I uncomment these two lines t/op/pack.t fails with
358 "modification of a read only value" for a reason I can't fathom why.
359 It's the "" stringification of $_, where $_ was set to '' in a foreach
04a4d38e
NC		 360 loop, but it defies simplification into a small test case.
361 However, commenting them out has caused ext/List/Util/t/weak.t to fail
362 the last test. */
3cc8d589
NC		 363 /*
364 mad_free(o->op_madprop);
365 o->op_madprop = 0;
366 */
eb8433b7
NC		 367#endif
368
369 retry:
11343788 370 switch (o->op_type) {
acb36ea4 371 case OP_NULL: /* Was holding old type, if any. */
eb8433b7
NC		 372 if (PL_madskills && o->op_targ != OP_NULL) {
373 o->op_type = o->op_targ;
374 o->op_targ = 0;
375 goto retry;
376 }
acb36ea4 377 case OP_ENTEREVAL: /* Was holding hints. */
acb36ea4 378 o->op_targ = 0;
a0d0e21e 379 break;
a6006777 380 default:
ac4c12e7 381 if (!(o->op_flags & OPf_REF)
0b94c7bb 382 || (PL_check[o->op_type] != MEMBER_TO_FPTR(Perl_ck_ftst)))
a6006777 383 break;
384 /* FALL THROUGH */
463ee0b2 385 case OP_GVSV:
79072805 386 case OP_GV:
a6006777 387 case OP_AELEMFAST:
6a077020
DM		 388 if (! (o->op_type == OP_AELEMFAST && o->op_flags & OPf_SPECIAL)) {
389 /* not an OP_PADAV replacement */
350de78d 390#ifdef USE_ITHREADS
6a077020
DM		 391 if (cPADOPo->op_padix > 0) {
392 /* No GvIN_PAD_off(cGVOPo_gv) here, because other references
393 * may still exist on the pad */
394 pad_swipe(cPADOPo->op_padix, TRUE);
395 cPADOPo->op_padix = 0;
396 }
350de78d 397#else
6a077020 398 SvREFCNT_dec(cSVOPo->op_sv);
a0714e2c 399 cSVOPo->op_sv = NULL;
350de78d 400#endif
6a077020 401 }
79072805 402 break;
a1ae71d2 403 case OP_METHOD_NAMED:
79072805 404 case OP_CONST:
11343788 405 SvREFCNT_dec(cSVOPo->op_sv);
a0714e2c 406 cSVOPo->op_sv = NULL;
3b1c21fa
AB		 407#ifdef USE_ITHREADS
408 /** Bug #15654
409 Even if op_clear does a pad_free for the target of the op,
6a077020 410 pad_free doesn't actually remove the sv that exists in the pad;
3b1c21fa
AB		 411 instead it lives on. This results in that it could be reused as
412 a target later on when the pad was reallocated.
413 **/
414 if(o->op_targ) {
415 pad_swipe(o->op_targ,1);
416 o->op_targ = 0;
417 }
418#endif
79072805 419 break;
748a9306
LW		 420 case OP_GOTO:
421 case OP_NEXT:
422 case OP_LAST:
423 case OP_REDO:
11343788 424 if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
748a9306
LW		 425 break;
426 /* FALL THROUGH */
a0d0e21e 427 case OP_TRANS:
acb36ea4 428 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
a0ed51b3 429 SvREFCNT_dec(cSVOPo->op_sv);
a0714e2c 430 cSVOPo->op_sv = NULL;
acb36ea4
GS		 431 }
432 else {
a0ed51b3 433 Safefree(cPVOPo->op_pv);
bd61b366 434 cPVOPo->op_pv = NULL;
acb36ea4 435 }
a0d0e21e
LW		 436 break;
437 case OP_SUBST:
11343788 438 op_free(cPMOPo->op_pmreplroot);
971a9dd3 439 goto clear_pmop;
748a9306 440 case OP_PUSHRE:
971a9dd3 441#ifdef USE_ITHREADS
ba89bb6e 442 if (INT2PTR(PADOFFSET, cPMOPo->op_pmreplroot)) {
dd2155a4
DM		 443 /* No GvIN_PAD_off here, because other references may still
444 * exist on the pad */
445 pad_swipe(INT2PTR(PADOFFSET, cPMOPo->op_pmreplroot), TRUE);
971a9dd3
GS		 446 }
447#else
448 SvREFCNT_dec((SV*)cPMOPo->op_pmreplroot);
449#endif
450 /* FALL THROUGH */
a0d0e21e 451 case OP_MATCH:
8782bef2 452 case OP_QR:
971a9dd3 453clear_pmop:
cb55de95 454 {
551405c4 455 HV * const pmstash = PmopSTASH(cPMOPo);
0565a181 456 if (pmstash && !SvIS_FREED(pmstash)) {
551405c4 457 MAGIC * const mg = mg_find((SV*)pmstash, PERL_MAGIC_symtab);
8d2f4536
NC		 458 if (mg) {
459 PMOP *pmop = (PMOP*) mg->mg_obj;
460 PMOP *lastpmop = NULL;
461 while (pmop) {
462 if (cPMOPo == pmop) {
463 if (lastpmop)
464 lastpmop->op_pmnext = pmop->op_pmnext;
465 else
466 mg->mg_obj = (SV*) pmop->op_pmnext;
467 break;
468 }
469 lastpmop = pmop;
470 pmop = pmop->op_pmnext;
cb55de95 471 }
cb55de95 472 }
83da49e6 473 }
05ec9bb3 474 PmopSTASH_free(cPMOPo);
cb55de95 475 }
5f66b61c 476 cPMOPo->op_pmreplroot = NULL;
5f8cb046
DM		 477 /* we use the "SAFE" version of the PM_ macros here
478 * since sv_clean_all might release some PMOPs
479 * after PL_regex_padav has been cleared
480 * and the clearing of PL_regex_padav needs to
481 * happen before sv_clean_all
482 */
483 ReREFCNT_dec(PM_GETRE_SAFE(cPMOPo));
5f66b61c 484 PM_SETRE_SAFE(cPMOPo, NULL);
13137afc
AB		 485#ifdef USE_ITHREADS
486 if(PL_regex_pad) { /* We could be in destruction */
487 av_push((AV*) PL_regex_pad[0],(SV*) PL_regex_pad[(cPMOPo)->op_pmoffset]);
1cc8b4c5 488 SvREPADTMP_on(PL_regex_pad[(cPMOPo)->op_pmoffset]);
13137afc
AB		 489 PM_SETRE(cPMOPo, (cPMOPo)->op_pmoffset);
490 }
1eb1540c 491#endif
13137afc 492
a0d0e21e 493 break;
79072805
LW		 494 }
495
743e66e6 496 if (o->op_targ > 0) {
11343788 497 pad_free(o->op_targ);
743e66e6
GS		 498 o->op_targ = 0;
499 }
79072805
LW		 500}
501
76e3520e 502STATIC void
3eb57f73
HS		 503S_cop_free(pTHX_ COP* cop)
504{
05ec9bb3
NIS		 505 Safefree(cop->cop_label); /* FIXME: treaddead ??? */
506 CopFILE_free(cop);
507 CopSTASH_free(cop);
0453d815 508 if (! specialWARN(cop->cop_warnings))
72dc9ed5 509 PerlMemShared_free(cop->cop_warnings);
05ec9bb3
NIS		 510 if (! specialCopIO(cop->cop_io)) {
511#ifdef USE_ITHREADS
bb263b4e 512 /*EMPTY*/
05ec9bb3 513#else
ac27b0f5 514 SvREFCNT_dec(cop->cop_io);
05ec9bb3
NIS		 515#endif
516 }
b3ca2e83 517 Perl_refcounted_he_free(aTHX_ cop->cop_hints);
3eb57f73
HS		 518}
519
93c66552
DM		 520void
521Perl_op_null(pTHX_ OP *o)
8990e307 522{
27da23d5 523 dVAR;
acb36ea4
GS		 524 if (o->op_type == OP_NULL)
525 return;
eb8433b7
NC		 526 if (!PL_madskills)
527 op_clear(o);
11343788
MB		 528 o->op_targ = o->op_type;
529 o->op_type = OP_NULL;
22c35a8c 530 o->op_ppaddr = PL_ppaddr[OP_NULL];
8990e307
LW		 531}
532
4026c95a
SH		 533void
534Perl_op_refcnt_lock(pTHX)
535{
27da23d5 536 dVAR;
96a5add6 537 PERL_UNUSED_CONTEXT;
4026c95a
SH		 538 OP_REFCNT_LOCK;
539}
540
541void
542Perl_op_refcnt_unlock(pTHX)
543{
27da23d5 544 dVAR;
96a5add6 545 PERL_UNUSED_CONTEXT;
4026c95a
SH		 546 OP_REFCNT_UNLOCK;
547}
548
79072805
LW		 549/* Contextualizers */
550
463ee0b2 551#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
79072805
LW		 552
553OP *
864dbfa3 554Perl_linklist(pTHX_ OP *o)
79072805 555{
3edf23ff 556 OP *first;
79072805 557
11343788
MB		 558 if (o->op_next)
559 return o->op_next;
79072805
LW		 560
561 /* establish postfix order */
3edf23ff
AL		 562 first = cUNOPo->op_first;
563 if (first) {
6867be6d 564 register OP *kid;
3edf23ff
AL		 565 o->op_next = LINKLIST(first);
566 kid = first;
567 for (;;) {
568 if (kid->op_sibling) {
79072805 569 kid->op_next = LINKLIST(kid->op_sibling);
3edf23ff
AL		 570 kid = kid->op_sibling;
571 } else {
11343788 572 kid->op_next = o;
3edf23ff
AL		 573 break;
574 }
79072805
LW		 575 }
576 }
577 else
11343788 578 o->op_next = o;
79072805 579
11343788 580 return o->op_next;
79072805
LW		 581}
582
583OP *
864dbfa3 584Perl_scalarkids(pTHX_ OP *o)
79072805 585{
11343788 586 if (o && o->op_flags & OPf_KIDS) {
bfed75c6 587 OP *kid;
11343788 588 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 589 scalar(kid);
590 }
11343788 591 return o;
79072805
LW		 592}
593
76e3520e 594STATIC OP *
cea2e8a9 595S_scalarboolean(pTHX_ OP *o)
8990e307 596{
97aff369 597 dVAR;
d008e5eb 598 if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
d008e5eb 599 if (ckWARN(WARN_SYNTAX)) {
6867be6d 600 const line_t oldline = CopLINE(PL_curcop);
a0d0e21e 601
d008e5eb 602 if (PL_copline != NOLINE)
57843af0 603 CopLINE_set(PL_curcop, PL_copline);
9014280d 604 Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Found = in conditional, should be ==");
57843af0 605 CopLINE_set(PL_curcop, oldline);
d008e5eb 606 }
a0d0e21e 607 }
11343788 608 return scalar(o);
8990e307
LW		 609}
610
611OP *
864dbfa3 612Perl_scalar(pTHX_ OP *o)
79072805 613{
27da23d5 614 dVAR;
79072805
LW		 615 OP *kid;
616
a0d0e21e 617 /* assumes no premature commitment */
551405c4 618 if (!o || PL_error_count || (o->op_flags & OPf_WANT)
5dc0d613 619 || o->op_type == OP_RETURN)
7e363e51 620 {
11343788 621 return o;
7e363e51 622 }
79072805 623
5dc0d613 624 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
79072805 625
11343788 626 switch (o->op_type) {
79072805 627 case OP_REPEAT:
11343788 628 scalar(cBINOPo->op_first);
8990e307 629 break;
79072805
LW		 630 case OP_OR:
631 case OP_AND:
632 case OP_COND_EXPR:
11343788 633 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
8990e307 634 scalar(kid);
79072805 635 break;
a0d0e21e 636 case OP_SPLIT:
11343788 637 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e 638 if (!kPMOP->op_pmreplroot)
12bcd1a6 639 deprecate_old("implicit split to @_");
a0d0e21e
LW		 640 }
641 /* FALL THROUGH */
79072805 642 case OP_MATCH:
8782bef2 643 case OP_QR:
79072805
LW		 644 case OP_SUBST:
645 case OP_NULL:
8990e307 646 default:
11343788
MB		 647 if (o->op_flags & OPf_KIDS) {
648 for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
8990e307
LW		 649 scalar(kid);
650 }
79072805
LW		 651 break;
652 case OP_LEAVE:
653 case OP_LEAVETRY:
5dc0d613 654 kid = cLISTOPo->op_first;
54310121 655 scalar(kid);
155aba94 656 while ((kid = kid->op_sibling)) {
54310121 657 if (kid->op_sibling)
658 scalarvoid(kid);
659 else
660 scalar(kid);
661 }
3280af22 662 WITH_THR(PL_curcop = &PL_compiling);
54310121 663 break;
748a9306 664 case OP_SCOPE:
79072805 665 case OP_LINESEQ:
8990e307 666 case OP_LIST:
11343788 667 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 668 if (kid->op_sibling)
669 scalarvoid(kid);
670 else
671 scalar(kid);
672 }
3280af22 673 WITH_THR(PL_curcop = &PL_compiling);
79072805 674 break;
a801c63c
RGS		 675 case OP_SORT:
676 if (ckWARN(WARN_VOID))
9014280d 677 Perl_warner(aTHX_ packWARN(WARN_VOID), "Useless use of sort in scalar context");
79072805 678 }
11343788 679 return o;
79072805
LW		 680}
681
682OP *
864dbfa3 683Perl_scalarvoid(pTHX_ OP *o)
79072805 684{
27da23d5 685 dVAR;
79072805 686 OP *kid;
c445ea15 687 const char* useless = NULL;
8990e307 688 SV* sv;
2ebea0a1
GS		 689 U8 want;
690
eb8433b7
NC		 691 /* trailing mad null ops don't count as "there" for void processing */
692 if (PL_madskills &&
693 o->op_type != OP_NULL &&
694 o->op_sibling &&
695 o->op_sibling->op_type == OP_NULL)
696 {
697 OP *sib;
698 for (sib = o->op_sibling;
699 sib && sib->op_type == OP_NULL;
700 sib = sib->op_sibling) ;
701
702 if (!sib)
703 return o;
704 }
705
acb36ea4
GS		 706 if (o->op_type == OP_NEXTSTATE
707 || o->op_type == OP_SETSTATE
708 || o->op_type == OP_DBSTATE
709 || (o->op_type == OP_NULL && (o->op_targ == OP_NEXTSTATE
710 || o->op_targ == OP_SETSTATE
711 || o->op_targ == OP_DBSTATE)))
2ebea0a1 712 PL_curcop = (COP*)o; /* for warning below */
79072805 713
54310121 714 /* assumes no premature commitment */
2ebea0a1
GS		 715 want = o->op_flags & OPf_WANT;
716 if ((want && want != OPf_WANT_SCALAR) || PL_error_count
5dc0d613 717 || o->op_type == OP_RETURN)
7e363e51 718 {
11343788 719 return o;
7e363e51 720 }
79072805 721
b162f9ea 722 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 723 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
724 {
b162f9ea 725 return scalar(o); /* As if inside SASSIGN */
7e363e51 726 }
1c846c1f 727
5dc0d613 728 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
79072805 729
11343788 730 switch (o->op_type) {
79072805 731 default:
22c35a8c 732 if (!(PL_opargs[o->op_type] & OA_FOLDCONST))
8990e307 733 break;
36477c24 734 /* FALL THROUGH */
735 case OP_REPEAT:
11343788 736 if (o->op_flags & OPf_STACKED)
8990e307 737 break;
5d82c453
GA		 738 goto func_ops;
739 case OP_SUBSTR:
740 if (o->op_private == 4)
741 break;
8990e307
LW		 742 /* FALL THROUGH */
743 case OP_GVSV:
744 case OP_WANTARRAY:
745 case OP_GV:
746 case OP_PADSV:
747 case OP_PADAV:
748 case OP_PADHV:
749 case OP_PADANY:
750 case OP_AV2ARYLEN:
8990e307 751 case OP_REF:
a0d0e21e
LW		 752 case OP_REFGEN:
753 case OP_SREFGEN:
8990e307
LW		 754 case OP_DEFINED:
755 case OP_HEX:
756 case OP_OCT:
757 case OP_LENGTH:
8990e307
LW		 758 case OP_VEC:
759 case OP_INDEX:
760 case OP_RINDEX:
761 case OP_SPRINTF:
762 case OP_AELEM:
763 case OP_AELEMFAST:
764 case OP_ASLICE:
8990e307
LW		 765 case OP_HELEM:
766 case OP_HSLICE:
767 case OP_UNPACK:
768 case OP_PACK:
8990e307
LW		 769 case OP_JOIN:
770 case OP_LSLICE:
771 case OP_ANONLIST:
772 case OP_ANONHASH:
773 case OP_SORT:
774 case OP_REVERSE:
775 case OP_RANGE:
776 case OP_FLIP:
777 case OP_FLOP:
778 case OP_CALLER:
779 case OP_FILENO:
780 case OP_EOF:
781 case OP_TELL:
782 case OP_GETSOCKNAME:
783 case OP_GETPEERNAME:
784 case OP_READLINK:
785 case OP_TELLDIR:
786 case OP_GETPPID:
787 case OP_GETPGRP:
788 case OP_GETPRIORITY:
789 case OP_TIME:
790 case OP_TMS:
791 case OP_LOCALTIME:
792 case OP_GMTIME:
793 case OP_GHBYNAME:
794 case OP_GHBYADDR:
795 case OP_GHOSTENT:
796 case OP_GNBYNAME:
797 case OP_GNBYADDR:
798 case OP_GNETENT:
799 case OP_GPBYNAME:
800 case OP_GPBYNUMBER:
801 case OP_GPROTOENT:
802 case OP_GSBYNAME:
803 case OP_GSBYPORT:
804 case OP_GSERVENT:
805 case OP_GPWNAM:
806 case OP_GPWUID:
807 case OP_GGRNAM:
808 case OP_GGRGID:
809 case OP_GETLOGIN:
78e1b766 810 case OP_PROTOTYPE:
5d82c453 811 func_ops:
64aac5a9 812 if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO)))
53e06cf0 813 useless = OP_DESC(o);
8990e307
LW		 814 break;
815
9f82cd5f
YST		 816 case OP_NOT:
817 kid = cUNOPo->op_first;
818 if (kid->op_type != OP_MATCH && kid->op_type != OP_SUBST &&
819 kid->op_type != OP_TRANS) {
820 goto func_ops;
821 }
822 useless = "negative pattern binding (!~)";
823 break;
824
8990e307
LW		 825 case OP_RV2GV:
826 case OP_RV2SV:
827 case OP_RV2AV:
828 case OP_RV2HV:
192587c2 829 if (!(o->op_private & (OPpLVAL_INTRO|OPpOUR_INTRO)) &&
11343788 830 (!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
8990e307
LW		 831 useless = "a variable";
832 break;
79072805
LW		 833
834 case OP_CONST:
7766f137 835 sv = cSVOPo_sv;
7a52d87a
GS		 836 if (cSVOPo->op_private & OPpCONST_STRICT)
837 no_bareword_allowed(o);
838 else {
d008e5eb
GS		 839 if (ckWARN(WARN_VOID)) {
840 useless = "a constant";
2e0ae2d3 841 if (o->op_private & OPpCONST_ARYBASE)
d4c19fe8 842 useless = NULL;
e7fec78e 843 /* don't warn on optimised away booleans, eg
b5a930ec 844 * use constant Foo, 5; Foo || print; */
e7fec78e 845 if (cSVOPo->op_private & OPpCONST_SHORTCIRCUIT)
d4c19fe8 846 useless = NULL;
960b4253
MG		 847 /* the constants 0 and 1 are permitted as they are
848 conventionally used as dummies in constructs like
849 1 while some_condition_with_side_effects; */
e7fec78e 850 else if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
d4c19fe8 851 useless = NULL;
d008e5eb 852 else if (SvPOK(sv)) {
a52fe3ac
A		 853 /* perl4's way of mixing documentation and code
854 (before the invention of POD) was based on a
855 trick to mix nroff and perl code. The trick was
856 built upon these three nroff macros being used in
857 void context. The pink camel has the details in
858 the script wrapman near page 319. */
6136c704
AL		 859 const char * const maybe_macro = SvPVX_const(sv);
860 if (strnEQ(maybe_macro, "di", 2) ||
861 strnEQ(maybe_macro, "ds", 2) ||
862 strnEQ(maybe_macro, "ig", 2))
d4c19fe8 863 useless = NULL;
d008e5eb 864 }
8990e307
LW		 865 }
866 }
93c66552 867 op_null(o); /* don't execute or even remember it */
79072805
LW		 868 break;
869
870 case OP_POSTINC:
11343788 871 o->op_type = OP_PREINC; /* pre-increment is faster */
22c35a8c 872 o->op_ppaddr = PL_ppaddr[OP_PREINC];
79072805
LW		 873 break;
874
875 case OP_POSTDEC:
11343788 876 o->op_type = OP_PREDEC; /* pre-decrement is faster */
22c35a8c 877 o->op_ppaddr = PL_ppaddr[OP_PREDEC];
79072805
LW		 878 break;
879
679d6c4e
HS		 880 case OP_I_POSTINC:
881 o->op_type = OP_I_PREINC; /* pre-increment is faster */
882 o->op_ppaddr = PL_ppaddr[OP_I_PREINC];
883 break;
884
885 case OP_I_POSTDEC:
886 o->op_type = OP_I_PREDEC; /* pre-decrement is faster */
887 o->op_ppaddr = PL_ppaddr[OP_I_PREDEC];
888 break;
889
79072805
LW		 890 case OP_OR:
891 case OP_AND:
c963b151 892 case OP_DOR:
79072805 893 case OP_COND_EXPR:
0d863452
RH		 894 case OP_ENTERGIVEN:
895 case OP_ENTERWHEN:
11343788 896 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 897 scalarvoid(kid);
898 break;
5aabfad6 899
a0d0e21e 900 case OP_NULL:
11343788 901 if (o->op_flags & OPf_STACKED)
a0d0e21e 902 break;
5aabfad6 903 /* FALL THROUGH */
2ebea0a1
GS		 904 case OP_NEXTSTATE:
905 case OP_DBSTATE:
79072805
LW		 906 case OP_ENTERTRY:
907 case OP_ENTER:
11343788 908 if (!(o->op_flags & OPf_KIDS))
79072805 909 break;
54310121 910 /* FALL THROUGH */
463ee0b2 911 case OP_SCOPE:
79072805
LW		 912 case OP_LEAVE:
913 case OP_LEAVETRY:
a0d0e21e 914 case OP_LEAVELOOP:
79072805 915 case OP_LINESEQ:
79072805 916 case OP_LIST:
0d863452
RH		 917 case OP_LEAVEGIVEN:
918 case OP_LEAVEWHEN:
11343788 919 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 920 scalarvoid(kid);
921 break;
c90c0ff4 922 case OP_ENTEREVAL:
5196be3e 923 scalarkids(o);
c90c0ff4 924 break;
5aabfad6 925 case OP_REQUIRE:
c90c0ff4 926 /* all requires must return a boolean value */
5196be3e 927 o->op_flags &= ~OPf_WANT;
d6483035
GS		 928 /* FALL THROUGH */
929 case OP_SCALAR:
5196be3e 930 return scalar(o);
a0d0e21e 931 case OP_SPLIT:
11343788 932 if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
a0d0e21e 933 if (!kPMOP->op_pmreplroot)
12bcd1a6 934 deprecate_old("implicit split to @_");
a0d0e21e
LW		 935 }
936 break;
79072805 937 }
411caa50 938 if (useless && ckWARN(WARN_VOID))
9014280d 939 Perl_warner(aTHX_ packWARN(WARN_VOID), "Useless use of %s in void context", useless);
11343788 940 return o;
79072805
LW		 941}
942
943OP *
864dbfa3 944Perl_listkids(pTHX_ OP *o)
79072805 945{
11343788 946 if (o && o->op_flags & OPf_KIDS) {
6867be6d 947 OP *kid;
11343788 948 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
79072805
LW		 949 list(kid);
950 }
11343788 951 return o;
79072805
LW		 952}
953
954OP *
864dbfa3 955Perl_list(pTHX_ OP *o)
79072805 956{
27da23d5 957 dVAR;
79072805
LW		 958 OP *kid;
959
a0d0e21e 960 /* assumes no premature commitment */
3280af22 961 if (!o || (o->op_flags & OPf_WANT) || PL_error_count
5dc0d613 962 || o->op_type == OP_RETURN)
7e363e51 963 {
11343788 964 return o;
7e363e51 965 }
79072805 966
b162f9ea 967 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 968 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
969 {
b162f9ea 970 return o; /* As if inside SASSIGN */
7e363e51 971 }
1c846c1f 972
5dc0d613 973 o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_LIST;
79072805 974
11343788 975 switch (o->op_type) {
79072805
LW		 976 case OP_FLOP:
977 case OP_REPEAT:
11343788 978 list(cBINOPo->op_first);
79072805
LW		 979 break;
980 case OP_OR:
981 case OP_AND:
982 case OP_COND_EXPR:
11343788 983 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
79072805
LW		 984 list(kid);
985 break;
986 default:
987 case OP_MATCH:
8782bef2 988 case OP_QR:
79072805
LW		 989 case OP_SUBST:
990 case OP_NULL:
11343788 991 if (!(o->op_flags & OPf_KIDS))
79072805 992 break;
11343788
MB		 993 if (!o->op_next && cUNOPo->op_first->op_type == OP_FLOP) {
994 list(cBINOPo->op_first);
995 return gen_constant_list(o);
79072805
LW		 996 }
997 case OP_LIST:
11343788 998 listkids(o);
79072805
LW		 999 break;
1000 case OP_LEAVE:
1001 case OP_LEAVETRY:
5dc0d613 1002 kid = cLISTOPo->op_first;
54310121 1003 list(kid);
155aba94 1004 while ((kid = kid->op_sibling)) {
54310121 1005 if (kid->op_sibling)
1006 scalarvoid(kid);
1007 else
1008 list(kid);
1009 }
3280af22 1010 WITH_THR(PL_curcop = &PL_compiling);
54310121 1011 break;
748a9306 1012 case OP_SCOPE:
79072805 1013 case OP_LINESEQ:
11343788 1014 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
79072805
LW		 1015 if (kid->op_sibling)
1016 scalarvoid(kid);
1017 else
1018 list(kid);
1019 }
3280af22 1020 WITH_THR(PL_curcop = &PL_compiling);
79072805 1021 break;
c90c0ff4 1022 case OP_REQUIRE:
1023 /* all requires must return a boolean value */
5196be3e
MB		 1024 o->op_flags &= ~OPf_WANT;
1025 return scalar(o);
79072805 1026 }
11343788 1027 return o;
79072805
LW		 1028}
1029
1030OP *
864dbfa3 1031Perl_scalarseq(pTHX_ OP *o)
79072805 1032{
97aff369 1033 dVAR;
11343788
MB		 1034 if (o) {
1035 if (o->op_type == OP_LINESEQ ||
1036 o->op_type == OP_SCOPE ||
1037 o->op_type == OP_LEAVE ||
1038 o->op_type == OP_LEAVETRY)
463ee0b2 1039 {
6867be6d 1040 OP *kid;
11343788 1041 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
ed6116ce 1042 if (kid->op_sibling) {
463ee0b2 1043 scalarvoid(kid);
ed6116ce 1044 }
463ee0b2 1045 }
3280af22 1046 PL_curcop = &PL_compiling;
79072805 1047 }
11343788 1048 o->op_flags &= ~OPf_PARENS;
3280af22 1049 if (PL_hints & HINT_BLOCK_SCOPE)
11343788 1050 o->op_flags |= OPf_PARENS;
79072805 1051 }
8990e307 1052 else
11343788
MB		 1053 o = newOP(OP_STUB, 0);
1054 return o;
79072805
LW		 1055}
1056
76e3520e 1057STATIC OP *
cea2e8a9 1058S_modkids(pTHX_ OP *o, I32 type)
79072805 1059{
11343788 1060 if (o && o->op_flags & OPf_KIDS) {
6867be6d 1061 OP *kid;
11343788 1062 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2 1063 mod(kid, type);
79072805 1064 }
11343788 1065 return o;
79072805
LW		 1066}
1067
ff7298cb 1068/* Propagate lvalue ("modifiable") context to an op and its children.
ddeae0f1
DM		 1069 * 'type' represents the context type, roughly based on the type of op that
1070 * would do the modifying, although local() is represented by OP_NULL.
1071 * It's responsible for detecting things that can't be modified, flag
1072 * things that need to behave specially in an lvalue context (e.g., "$$x = 5"
1073 * might have to vivify a reference in $x), and so on.
1074 *
1075 * For example, "$a+1 = 2" would cause mod() to be called with o being
1076 * OP_ADD and type being OP_SASSIGN, and would output an error.
1077 */
1078
79072805 1079OP *
864dbfa3 1080Perl_mod(pTHX_ OP *o, I32 type)
79072805 1081{
27da23d5 1082 dVAR;
79072805 1083 OP *kid;
ddeae0f1
DM		 1084 /* -1 = error on localize, 0 = ignore localize, 1 = ok to localize */
1085 int localize = -1;
79072805 1086
3280af22 1087 if (!o || PL_error_count)
11343788 1088 return o;
79072805 1089
b162f9ea 1090 if ((o->op_private & OPpTARGET_MY)
7e363e51
GS		 1091 && (PL_opargs[o->op_type] & OA_TARGLEX))/* OPp share the meaning */
1092 {
b162f9ea 1093 return o;
7e363e51 1094 }
1c846c1f 1095
11343788 1096 switch (o->op_type) {
68dc0745 1097 case OP_UNDEF:
ddeae0f1 1098 localize = 0;
3280af22 1099 PL_modcount++;
5dc0d613 1100 return o;
a0d0e21e 1101 case OP_CONST:
2e0ae2d3 1102 if (!(o->op_private & OPpCONST_ARYBASE))
a0d0e21e 1103 goto nomod;
54dc0f91 1104 localize = 0;
3280af22 1105 if (PL_eval_start && PL_eval_start->op_type == OP_CONST) {
fc15ae8f
NC		 1106 CopARYBASE_set(&PL_compiling,
1107 (I32)SvIV(cSVOPx(PL_eval_start)->op_sv));
3280af22 1108 PL_eval_start = 0;
a0d0e21e
LW		 1109 }
1110 else if (!type) {
fc15ae8f
NC		 1111 SAVECOPARYBASE(&PL_compiling);
1112 CopARYBASE_set(&PL_compiling, 0);
a0d0e21e
LW		 1113 }
1114 else if (type == OP_REFGEN)
1115 goto nomod;
1116 else
cea2e8a9 1117 Perl_croak(aTHX_ "That use of $[ is unsupported");
a0d0e21e 1118 break;
5f05dabc 1119 case OP_STUB:
eb8433b7 1120 if (o->op_flags & OPf_PARENS || PL_madskills)
5f05dabc 1121 break;
1122 goto nomod;
a0d0e21e
LW		 1123 case OP_ENTERSUB:
1124 if ((type == OP_UNDEF || type == OP_REFGEN) &&
11343788
MB		 1125 !(o->op_flags & OPf_STACKED)) {
1126 o->op_type = OP_RV2CV; /* entersub => rv2cv */
e26df76a
NC		 1127 /* The default is to set op_private to the number of children,
1128 which for a UNOP such as RV2CV is always 1. And w're using
1129 the bit for a flag in RV2CV, so we need it clear. */
1130 o->op_private &= ~1;
22c35a8c 1131 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788 1132 assert(cUNOPo->op_first->op_type == OP_NULL);
93c66552 1133 op_null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
79072805
LW		 1134 break;
1135 }
95f0a2f1
SB		 1136 else if (o->op_private & OPpENTERSUB_NOMOD)
1137 return o;
cd06dffe
GS		 1138 else { /* lvalue subroutine call */
1139 o->op_private |= OPpLVAL_INTRO;
e6438c1a 1140 PL_modcount = RETURN_UNLIMITED_NUMBER;
4978d6d9 1141 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN) {
cd06dffe
GS		 1142 /* Backward compatibility mode: */
1143 o->op_private |= OPpENTERSUB_INARGS;
1144 break;
1145 }
1146 else { /* Compile-time error message: */
1147 OP *kid = cUNOPo->op_first;
1148 CV *cv;
1149 OP *okid;
1150
1151 if (kid->op_type == OP_PUSHMARK)
1152 goto skip_kids;
1153 if (kid->op_type != OP_NULL || kid->op_targ != OP_LIST)
1154 Perl_croak(aTHX_
1155 "panic: unexpected lvalue entersub "
55140b79 1156 "args: type/targ %ld:%"UVuf,
3d811634 1157 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1158 kid = kLISTOP->op_first;
1159 skip_kids:
1160 while (kid->op_sibling)
1161 kid = kid->op_sibling;
1162 if (!(kid->op_type == OP_NULL && kid->op_targ == OP_RV2CV)) {
1163 /* Indirect call */
1164 if (kid->op_type == OP_METHOD_NAMED
1165 || kid->op_type == OP_METHOD)
1166 {
87d7fd28 1167 UNOP *newop;
b2ffa427 1168
87d7fd28 1169 NewOp(1101, newop, 1, UNOP);
349fd7b7
GS		 1170 newop->op_type = OP_RV2CV;
1171 newop->op_ppaddr = PL_ppaddr[OP_RV2CV];
5f66b61c 1172 newop->op_first = NULL;
87d7fd28
GS		 1173 newop->op_next = (OP*)newop;
1174 kid->op_sibling = (OP*)newop;
349fd7b7 1175 newop->op_private |= OPpLVAL_INTRO;
e26df76a 1176 newop->op_private &= ~1;
cd06dffe
GS		 1177 break;
1178 }
b2ffa427 1179
cd06dffe
GS		 1180 if (kid->op_type != OP_RV2CV)
1181 Perl_croak(aTHX_
1182 "panic: unexpected lvalue entersub "
55140b79 1183 "entry via type/targ %ld:%"UVuf,
3d811634 1184 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1185 kid->op_private |= OPpLVAL_INTRO;
1186 break; /* Postpone until runtime */
1187 }
b2ffa427
NIS		 1188
1189 okid = kid;
cd06dffe
GS		 1190 kid = kUNOP->op_first;
1191 if (kid->op_type == OP_NULL && kid->op_targ == OP_RV2SV)
1192 kid = kUNOP->op_first;
b2ffa427 1193 if (kid->op_type == OP_NULL)
cd06dffe
GS		 1194 Perl_croak(aTHX_
1195 "Unexpected constant lvalue entersub "
55140b79 1196 "entry via type/targ %ld:%"UVuf,
3d811634 1197 (long)kid->op_type, (UV)kid->op_targ);
cd06dffe
GS		 1198 if (kid->op_type != OP_GV) {
1199 /* Restore RV2CV to check lvalueness */
1200 restore_2cv:
1201 if (kid->op_next && kid->op_next != kid) { /* Happens? */
1202 okid->op_next = kid->op_next;
1203 kid->op_next = okid;
1204 }
1205 else
5f66b61c 1206 okid->op_next = NULL;
cd06dffe
GS		 1207 okid->op_type = OP_RV2CV;
1208 okid->op_targ = 0;
1209 okid->op_ppaddr = PL_ppaddr[OP_RV2CV];
1210 okid->op_private |= OPpLVAL_INTRO;
e26df76a 1211 okid->op_private &= ~1;
cd06dffe
GS		 1212 break;
1213 }
b2ffa427 1214
638eceb6 1215 cv = GvCV(kGVOP_gv);
1c846c1f 1216 if (!cv)
cd06dffe
GS		 1217 goto restore_2cv;
1218 if (CvLVALUE(cv))
1219 break;
1220 }
1221 }
79072805
LW		 1222 /* FALL THROUGH */
1223 default:
a0d0e21e 1224 nomod:
6fbb66d6
NC		 1225 /* grep, foreach, subcalls, refgen */
1226 if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
a0d0e21e 1227 break;
cea2e8a9 1228 yyerror(Perl_form(aTHX_ "Can't modify %s in %s",
638bc118 1229 (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
cd06dffe
GS		 1230 ? "do block"
1231 : (o->op_type == OP_ENTERSUB
1232 ? "non-lvalue subroutine call"
53e06cf0 1233 : OP_DESC(o))),
22c35a8c 1234 type ? PL_op_desc[type] : "local"));
11343788 1235 return o;
79072805 1236
a0d0e21e
LW		 1237 case OP_PREINC:
1238 case OP_PREDEC:
1239 case OP_POW:
1240 case OP_MULTIPLY:
1241 case OP_DIVIDE:
1242 case OP_MODULO:
1243 case OP_REPEAT:
1244 case OP_ADD:
1245 case OP_SUBTRACT:
1246 case OP_CONCAT:
1247 case OP_LEFT_SHIFT:
1248 case OP_RIGHT_SHIFT:
1249 case OP_BIT_AND:
1250 case OP_BIT_XOR:
1251 case OP_BIT_OR:
1252 case OP_I_MULTIPLY:
1253 case OP_I_DIVIDE:
1254 case OP_I_MODULO:
1255 case OP_I_ADD:
1256 case OP_I_SUBTRACT:
11343788 1257 if (!(o->op_flags & OPf_STACKED))
a0d0e21e 1258 goto nomod;
3280af22 1259 PL_modcount++;
a0d0e21e 1260 break;
b2ffa427 1261
79072805 1262 case OP_COND_EXPR:
ddeae0f1 1263 localize = 1;
11343788 1264 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
463ee0b2 1265 mod(kid, type);
79072805
LW		 1266 break;
1267
1268 case OP_RV2AV:
1269 case OP_RV2HV:
11343788 1270 if (type == OP_REFGEN && o->op_flags & OPf_PARENS) {
e6438c1a 1271 PL_modcount = RETURN_UNLIMITED_NUMBER;
11343788 1272 return o; /* Treat \(@foo) like ordinary list. */
748a9306
LW		 1273 }
1274 /* FALL THROUGH */
79072805 1275 case OP_RV2GV:
5dc0d613 1276 if (scalar_mod_type(o, type))
3fe9a6f1 1277 goto nomod;
11343788 1278 ref(cUNOPo->op_first, o->op_type);
79072805 1279 /* FALL THROUGH */
79072805
LW		 1280 case OP_ASLICE:
1281 case OP_HSLICE:
78f9721b
SM		 1282 if (type == OP_LEAVESUBLV)
1283 o->op_private |= OPpMAYBE_LVSUB;
ddeae0f1 1284 localize = 1;
78f9721b
SM		 1285 /* FALL THROUGH */
1286 case OP_AASSIGN:
93a17b20
LW		 1287 case OP_NEXTSTATE:
1288 case OP_DBSTATE:
e6438c1a 1289 PL_modcount = RETURN_UNLIMITED_NUMBER;
79072805 1290 break;
463ee0b2 1291 case OP_RV2SV:
aeea060c 1292 ref(cUNOPo->op_first, o->op_type);
ddeae0f1 1293 localize = 1;
463ee0b2 1294 /* FALL THROUGH */
79072805 1295 case OP_GV:
463ee0b2 1296 case OP_AV2ARYLEN:
3280af22 1297 PL_hints |= HINT_BLOCK_SCOPE;
463ee0b2 1298 case OP_SASSIGN:
bf4b1e52
GS		 1299 case OP_ANDASSIGN:
1300 case OP_ORASSIGN:
c963b151 1301 case OP_DORASSIGN:
ddeae0f1
DM		 1302 PL_modcount++;
1303 break;
1304
8990e307 1305 case OP_AELEMFAST:
6a077020 1306 localize = -1;
3280af22 1307 PL_modcount++;
8990e307
LW		 1308 break;
1309
748a9306
LW		 1310 case OP_PADAV:
1311 case OP_PADHV:
e6438c1a 1312 PL_modcount = RETURN_UNLIMITED_NUMBER;
5196be3e
MB		 1313 if (type == OP_REFGEN && o->op_flags & OPf_PARENS)
1314 return o; /* Treat \(@foo) like ordinary list. */
1315 if (scalar_mod_type(o, type))
3fe9a6f1 1316 goto nomod;
78f9721b
SM		 1317 if (type == OP_LEAVESUBLV)
1318 o->op_private |= OPpMAYBE_LVSUB;
748a9306
LW		 1319 /* FALL THROUGH */
1320 case OP_PADSV:
3280af22 1321 PL_modcount++;
ddeae0f1 1322 if (!type) /* local() */
cea2e8a9 1323 Perl_croak(aTHX_ "Can't localize lexical variable %s",
dd2155a4 1324 PAD_COMPNAME_PV(o->op_targ));
463ee0b2
LW		 1325 break;
1326
748a9306 1327 case OP_PUSHMARK:
ddeae0f1 1328 localize = 0;
748a9306 1329 break;
b2ffa427 1330
69969c6f
SB		 1331 case OP_KEYS:
1332 if (type != OP_SASSIGN)
1333 goto nomod;
5d82c453
GA		 1334 goto lvalue_func;
1335 case OP_SUBSTR:
1336 if (o->op_private == 4) /* don't allow 4 arg substr as lvalue */
1337 goto nomod;
5f05dabc 1338 /* FALL THROUGH */
a0d0e21e 1339 case OP_POS:
463ee0b2 1340 case OP_VEC:
78f9721b
SM		 1341 if (type == OP_LEAVESUBLV)
1342 o->op_private |= OPpMAYBE_LVSUB;
5d82c453 1343 lvalue_func:
11343788
MB		 1344 pad_free(o->op_targ);
1345 o->op_targ = pad_alloc(o->op_type, SVs_PADMY);
5dc0d613 1346 assert(SvTYPE(PAD_SV(o->op_targ)) == SVt_NULL);
11343788
MB		 1347 if (o->op_flags & OPf_KIDS)
1348 mod(cBINOPo->op_first->op_sibling, type);
463ee0b2 1349 break;
a0d0e21e 1350
463ee0b2
LW		 1351 case OP_AELEM:
1352 case OP_HELEM:
11343788 1353 ref(cBINOPo->op_first, o->op_type);
68dc0745 1354 if (type == OP_ENTERSUB &&
5dc0d613
MB		 1355 !(o->op_private & (OPpLVAL_INTRO | OPpDEREF)))
1356 o->op_private |= OPpLVAL_DEFER;
78f9721b
SM		 1357 if (type == OP_LEAVESUBLV)
1358 o->op_private |= OPpMAYBE_LVSUB;
ddeae0f1 1359 localize = 1;
3280af22 1360 PL_modcount++;
463ee0b2
LW		 1361 break;
1362
1363 case OP_SCOPE:
1364 case OP_LEAVE:
1365 case OP_ENTER:
78f9721b 1366 case OP_LINESEQ:
ddeae0f1 1367 localize = 0;
11343788
MB		 1368 if (o->op_flags & OPf_KIDS)
1369 mod(cLISTOPo->op_last, type);
a0d0e21e
LW		 1370 break;
1371
1372 case OP_NULL:
ddeae0f1 1373 localize = 0;
638bc118
GS		 1374 if (o->op_flags & OPf_SPECIAL) /* do BLOCK */
1375 goto nomod;
1376 else if (!(o->op_flags & OPf_KIDS))
463ee0b2 1377 break;
11343788
MB		 1378 if (o->op_targ != OP_LIST) {
1379 mod(cBINOPo->op_first, type);
a0d0e21e
LW		 1380 break;
1381 }
1382 /* FALL THROUGH */
463ee0b2 1383 case OP_LIST:
ddeae0f1 1384 localize = 0;
11343788 1385 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1386 mod(kid, type);
1387 break;
78f9721b
SM		 1388
1389 case OP_RETURN:
1390 if (type != OP_LEAVESUBLV)
1391 goto nomod;
1392 break; /* mod()ing was handled by ck_return() */
463ee0b2 1393 }
58d95175 1394
8be1be90
AMS		 1395 /* [20011101.069] File test operators interpret OPf_REF to mean that
1396 their argument is a filehandle; thus \stat(".") should not set
1397 it. AMS 20011102 */
1398 if (type == OP_REFGEN &&
1399 PL_check[o->op_type] == MEMBER_TO_FPTR(Perl_ck_ftst))
1400 return o;
1401
1402 if (type != OP_LEAVESUBLV)
1403 o->op_flags |= OPf_MOD;
1404
1405 if (type == OP_AASSIGN || type == OP_SASSIGN)
1406 o->op_flags |= OPf_SPECIAL|OPf_REF;
ddeae0f1
DM		 1407 else if (!type) { /* local() */
1408 switch (localize) {
1409 case 1:
1410 o->op_private |= OPpLVAL_INTRO;
1411 o->op_flags &= ~OPf_SPECIAL;
1412 PL_hints |= HINT_BLOCK_SCOPE;
1413 break;
1414 case 0:
1415 break;
1416 case -1:
1417 if (ckWARN(WARN_SYNTAX)) {
1418 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
1419 "Useless localization of %s", OP_DESC(o));
1420 }
1421 }
463ee0b2 1422 }
8be1be90
AMS		 1423 else if (type != OP_GREPSTART && type != OP_ENTERSUB
1424 && type != OP_LEAVESUBLV)
1425 o->op_flags |= OPf_REF;
11343788 1426 return o;
463ee0b2
LW		 1427}
1428
864dbfa3 1429STATIC bool
5f66b61c 1430S_scalar_mod_type(const OP *o, I32 type)
3fe9a6f1 1431{
1432 switch (type) {
1433 case OP_SASSIGN:
5196be3e 1434 if (o->op_type == OP_RV2GV)
3fe9a6f1 1435 return FALSE;
1436 /* FALL THROUGH */
1437 case OP_PREINC:
1438 case OP_PREDEC:
1439 case OP_POSTINC:
1440 case OP_POSTDEC:
1441 case OP_I_PREINC:
1442 case OP_I_PREDEC:
1443 case OP_I_POSTINC:
1444 case OP_I_POSTDEC:
1445 case OP_POW:
1446 case OP_MULTIPLY:
1447 case OP_DIVIDE:
1448 case OP_MODULO:
1449 case OP_REPEAT:
1450 case OP_ADD:
1451 case OP_SUBTRACT:
1452 case OP_I_MULTIPLY:
1453 case OP_I_DIVIDE:
1454 case OP_I_MODULO:
1455 case OP_I_ADD:
1456 case OP_I_SUBTRACT:
1457 case OP_LEFT_SHIFT:
1458 case OP_RIGHT_SHIFT:
1459 case OP_BIT_AND:
1460 case OP_BIT_XOR:
1461 case OP_BIT_OR:
1462 case OP_CONCAT:
1463 case OP_SUBST:
1464 case OP_TRANS:
49e9fbe6
GS		 1465 case OP_READ:
1466 case OP_SYSREAD:
1467 case OP_RECV:
bf4b1e52
GS		 1468 case OP_ANDASSIGN:
1469 case OP_ORASSIGN:
3fe9a6f1 1470 return TRUE;
1471 default:
1472 return FALSE;
1473 }
1474}
1475
35cd451c 1476STATIC bool
5f66b61c 1477S_is_handle_constructor(const OP *o, I32 numargs)
35cd451c
GS		 1478{
1479 switch (o->op_type) {
1480 case OP_PIPE_OP:
1481 case OP_SOCKPAIR:
504618e9 1482 if (numargs == 2)
35cd451c
GS		 1483 return TRUE;
1484 /* FALL THROUGH */
1485 case OP_SYSOPEN:
1486 case OP_OPEN:
ded8aa31 1487 case OP_SELECT: /* XXX c.f. SelectSaver.pm */
35cd451c
GS		 1488 case OP_SOCKET:
1489 case OP_OPEN_DIR:
1490 case OP_ACCEPT:
504618e9 1491 if (numargs == 1)
35cd451c 1492 return TRUE;
5f66b61c 1493 /* FALLTHROUGH */
35cd451c
GS		 1494 default:
1495 return FALSE;
1496 }
1497}
1498
463ee0b2 1499OP *
864dbfa3 1500Perl_refkids(pTHX_ OP *o, I32 type)
463ee0b2 1501{
11343788 1502 if (o && o->op_flags & OPf_KIDS) {
6867be6d 1503 OP *kid;
11343788 1504 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
463ee0b2
LW		 1505 ref(kid, type);
1506 }
11343788 1507 return o;
463ee0b2
LW		 1508}
1509
1510OP *
e4c5ccf3 1511Perl_doref(pTHX_ OP *o, I32 type, bool set_op_ref)
463ee0b2 1512{
27da23d5 1513 dVAR;
463ee0b2 1514 OP *kid;
463ee0b2 1515
3280af22 1516 if (!o || PL_error_count)
11343788 1517 return o;
463ee0b2 1518
11343788 1519 switch (o->op_type) {
a0d0e21e 1520 case OP_ENTERSUB:
afebc493 1521 if ((type == OP_EXISTS || type == OP_DEFINED || type == OP_LOCK) &&
11343788
MB		 1522 !(o->op_flags & OPf_STACKED)) {
1523 o->op_type = OP_RV2CV; /* entersub => rv2cv */
22c35a8c 1524 o->op_ppaddr = PL_ppaddr[OP_RV2CV];
11343788 1525 assert(cUNOPo->op_first->op_type == OP_NULL);
93c66552 1526 op_null(((LISTOP*)cUNOPo->op_first)->op_first); /* disable pushmark */
11343788 1527 o->op_flags |= OPf_SPECIAL;
e26df76a 1528 o->op_private &= ~1;
8990e307
LW		 1529 }
1530 break;
aeea060c 1531
463ee0b2 1532 case OP_COND_EXPR:
11343788 1533 for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
e4c5ccf3 1534 doref(kid, type, set_op_ref);
463ee0b2 1535 break;
8990e307 1536 case OP_RV2SV:
35cd451c
GS		 1537 if (type == OP_DEFINED)
1538 o->op_flags |= OPf_SPECIAL; /* don't create GV */
e4c5ccf3 1539 doref(cUNOPo->op_first, o->op_type, set_op_ref);
4633a7c4
LW		 1540 /* FALL THROUGH */
1541 case OP_PADSV:
5f05dabc 1542 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1543 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1544 : type == OP_RV2HV ? OPpDEREF_HV
1545 : OPpDEREF_SV);
11343788 1546 o->op_flags |= OPf_MOD;
a0d0e21e 1547 }
8990e307 1548 break;
1c846c1f 1549
2faa37cc 1550 case OP_THREADSV:
a863c7d1
MB		 1551 o->op_flags |= OPf_MOD; /* XXX ??? */
1552 break;
1553
463ee0b2
LW		 1554 case OP_RV2AV:
1555 case OP_RV2HV:
e4c5ccf3
RH		 1556 if (set_op_ref)
1557 o->op_flags |= OPf_REF;
8990e307 1558 /* FALL THROUGH */
463ee0b2 1559 case OP_RV2GV:
35cd451c
GS		 1560 if (type == OP_DEFINED)
1561 o->op_flags |= OPf_SPECIAL; /* don't create GV */
e4c5ccf3 1562 doref(cUNOPo->op_first, o->op_type, set_op_ref);
463ee0b2 1563 break;
8990e307 1564
463ee0b2
LW		 1565 case OP_PADAV:
1566 case OP_PADHV:
e4c5ccf3
RH		 1567 if (set_op_ref)
1568 o->op_flags |= OPf_REF;
79072805 1569 break;
aeea060c 1570
8990e307 1571 case OP_SCALAR:
79072805 1572 case OP_NULL:
11343788 1573 if (!(o->op_flags & OPf_KIDS))
463ee0b2 1574 break;
e4c5ccf3 1575 doref(cBINOPo->op_first, type, set_op_ref);
79072805
LW		 1576 break;
1577 case OP_AELEM:
1578 case OP_HELEM:
e4c5ccf3 1579 doref(cBINOPo->op_first, o->op_type, set_op_ref);
5f05dabc 1580 if (type == OP_RV2SV || type == OP_RV2AV || type == OP_RV2HV) {
5dc0d613
MB		 1581 o->op_private |= (type == OP_RV2AV ? OPpDEREF_AV
1582 : type == OP_RV2HV ? OPpDEREF_HV
1583 : OPpDEREF_SV);
11343788 1584 o->op_flags |= OPf_MOD;
8990e307 1585 }
79072805
LW		 1586 break;
1587
463ee0b2 1588 case OP_SCOPE:
79072805 1589 case OP_LEAVE:
e4c5ccf3
RH		 1590 set_op_ref = FALSE;
1591 /* FALL THROUGH */
79072805 1592 case OP_ENTER:
8990e307 1593 case OP_LIST:
11343788 1594 if (!(o->op_flags & OPf_KIDS))
79072805 1595 break;
e4c5ccf3 1596 doref(cLISTOPo->op_last, type, set_op_ref);
79072805 1597 break;
a0d0e21e
LW		 1598 default:
1599 break;
79072805 1600 }
11343788 1601 return scalar(o);
8990e307 1602
79072805
LW		 1603}
1604
09bef843
SB		 1605STATIC OP *
1606S_dup_attrlist(pTHX_ OP *o)
1607{
97aff369 1608 dVAR;
0bd48802 1609 OP *rop;
09bef843
SB		 1610
1611 /* An attrlist is either a simple OP_CONST or an OP_LIST with kids,
1612 * where the first kid is OP_PUSHMARK and the remaining ones
1613 * are OP_CONST. We need to push the OP_CONST values.
1614 */
1615 if (o->op_type == OP_CONST)
b37c2d43 1616 rop = newSVOP(OP_CONST, o->op_flags, SvREFCNT_inc_NN(cSVOPo->op_sv));
eb8433b7
NC		 1617#ifdef PERL_MAD
1618 else if (o->op_type == OP_NULL)
1d866c12 1619 rop = NULL;
eb8433b7 1620#endif
09bef843
SB		 1621 else {
1622 assert((o->op_type == OP_LIST) && (o->op_flags & OPf_KIDS));
5f66b61c 1623 rop = NULL;
09bef843
SB		 1624 for (o = cLISTOPo->op_first; o; o=o->op_sibling) {
1625 if (o->op_type == OP_CONST)
1626 rop = append_elem(OP_LIST, rop,
1627 newSVOP(OP_CONST, o->op_flags,
b37c2d43 1628 SvREFCNT_inc_NN(cSVOPo->op_sv)));
09bef843
SB		 1629 }
1630 }
1631 return rop;
1632}
1633
1634STATIC void
95f0a2f1 1635S_apply_attrs(pTHX_ HV *stash, SV *target, OP *attrs, bool for_my)
09bef843 1636{
27da23d5 1637 dVAR;
09bef843
SB		 1638 SV *stashsv;
1639
1640 /* fake up C<use attributes $pkg,$rv,@attrs> */
1641 ENTER; /* need to protect against side-effects of 'use' */
1642 SAVEINT(PL_expect);
5aaec2b4 1643 stashsv = stash ? newSVhek(HvNAME_HEK(stash)) : &PL_sv_no;
e4783991 1644
09bef843 1645#define ATTRSMODULE "attributes"
95f0a2f1
SB		 1646#define ATTRSMODULE_PM "attributes.pm"
1647
1648 if (for_my) {
95f0a2f1 1649 /* Don't force the C<use> if we don't need it. */
a4fc7abc 1650 SV * const * const svp = hv_fetchs(GvHVn(PL_incgv), ATTRSMODULE_PM, FALSE);
95f0a2f1 1651 if (svp && *svp != &PL_sv_undef)
bb263b4e 1652 /*EMPTY*/; /* already in %INC */
95f0a2f1
SB		 1653 else
1654 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT,
6136c704 1655 newSVpvs(ATTRSMODULE), NULL);
95f0a2f1
SB		 1656 }
1657 else {
1658 Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS,
6136c704
AL		 1659 newSVpvs(ATTRSMODULE),
1660 NULL,
95f0a2f1
SB		 1661 prepend_elem(OP_LIST,
1662 newSVOP(OP_CONST, 0, stashsv),
1663 prepend_elem(OP_LIST,
1664 newSVOP(OP_CONST, 0,
1665 newRV(target)),
1666 dup_attrlist(attrs))));
1667 }
09bef843
SB		 1668 LEAVE;
1669}
1670
95f0a2f1
SB		 1671STATIC void
1672S_apply_attrs_my(pTHX_ HV *stash, OP *target, OP *attrs, OP **imopsp)
1673{
97aff369 1674 dVAR;
95f0a2f1
SB		 1675 OP *pack, *imop, *arg;
1676 SV *meth, *stashsv;
1677
1678 if (!attrs)
1679 return;
1680
1681 assert(target->op_type == OP_PADSV ||
1682 target->op_type == OP_PADHV ||
1683 target->op_type == OP_PADAV);
1684
1685 /* Ensure that attributes.pm is loaded. */
dd2155a4 1686 apply_attrs(stash, PAD_SV(target->op_targ), attrs, TRUE);
95f0a2f1
SB		 1687
1688 /* Need package name for method call. */
6136c704 1689 pack = newSVOP(OP_CONST, 0, newSVpvs(ATTRSMODULE));
95f0a2f1
SB		 1690
1691 /* Build up the real arg-list. */
5aaec2b4
NC		 1692 stashsv = stash ? newSVhek(HvNAME_HEK(stash)) : &PL_sv_no;
1693
95f0a2f1
SB		 1694 arg = newOP(OP_PADSV, 0);
1695 arg->op_targ = target->op_targ;
1696 arg = prepend_elem(OP_LIST,
1697 newSVOP(OP_CONST, 0, stashsv),
1698 prepend_elem(OP_LIST,
1699 newUNOP(OP_REFGEN, 0,
1700 mod(arg, OP_REFGEN)),
1701 dup_attrlist(attrs)));
1702
1703 /* Fake up a method call to import */
18916d0d 1704 meth = newSVpvs_share("import");
95f0a2f1
SB		 1705 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL|OPf_WANT_VOID,
1706 append_elem(OP_LIST,
1707 prepend_elem(OP_LIST, pack, list(arg)),
1708 newSVOP(OP_METHOD_NAMED, 0, meth)));
1709 imop->op_private |= OPpENTERSUB_NOMOD;
1710
1711 /* Combine the ops. */
1712 *imopsp = append_elem(OP_LIST, *imopsp, imop);
1713}
1714
1715/*
1716=notfor apidoc apply_attrs_string
1717
1718Attempts to apply a list of attributes specified by the C<attrstr> and
1719C<len> arguments to the subroutine identified by the C<cv> argument which
1720is expected to be associated with the package identified by the C<stashpv>
1721argument (see L<attributes>). It gets this wrong, though, in that it
1722does not correctly identify the boundaries of the individual attribute
1723specifications within C<attrstr>. This is not really intended for the
1724public API, but has to be listed here for systems such as AIX which
1725need an explicit export list for symbols. (It's called from XS code
1726in support of the C<ATTRS:> keyword from F<xsubpp>.) Patches to fix it
1727to respect attribute syntax properly would be welcome.
1728
1729=cut
1730*/
1731
be3174d2 1732void
6867be6d
AL		 1733Perl_apply_attrs_string(pTHX_ const char *stashpv, CV *cv,
1734 const char *attrstr, STRLEN len)
be3174d2 1735{
5f66b61c 1736 OP *attrs = NULL;
be3174d2
GS		 1737
1738 if (!len) {
1739 len = strlen(attrstr);
1740 }
1741
1742 while (len) {
1743 for (; isSPACE(*attrstr) && len; --len, ++attrstr) ;
1744 if (len) {
890ce7af 1745 const char * const sstr = attrstr;
be3174d2
GS		 1746 for (; !isSPACE(*attrstr) && len; --len, ++attrstr) ;
1747 attrs = append_elem(OP_LIST, attrs,
1748 newSVOP(OP_CONST, 0,
1749 newSVpvn(sstr, attrstr-sstr)));
1750 }
1751 }
1752
1753 Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS,
6136c704 1754 newSVpvs(ATTRSMODULE),
a0714e2c 1755 NULL, prepend_elem(OP_LIST,
be3174d2
GS		 1756 newSVOP(OP_CONST, 0, newSVpv(stashpv,0)),
1757 prepend_elem(OP_LIST,
1758 newSVOP(OP_CONST, 0,
1759 newRV((SV*)cv)),
1760 attrs)));
1761}
1762
09bef843 1763STATIC OP *
95f0a2f1 1764S_my_kid(pTHX_ OP *o, OP *attrs, OP **imopsp)
93a17b20 1765{
97aff369 1766 dVAR;
93a17b20
LW		 1767 I32 type;
1768
3280af22 1769 if (!o || PL_error_count)
11343788 1770 return o;
93a17b20 1771
bc61e325 1772 type = o->op_type;
eb8433b7
NC		 1773 if (PL_madskills && type == OP_NULL && o->op_flags & OPf_KIDS) {
1774 (void)my_kid(cUNOPo->op_first, attrs, imopsp);
1775 return o;
1776 }
1777
93a17b20 1778 if (type == OP_LIST) {
6867be6d 1779 OP *kid;
11343788 1780 for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
95f0a2f1 1781 my_kid(kid, attrs, imopsp);
eb8433b7
NC		 1782 } else if (type == OP_UNDEF
1783#ifdef PERL_MAD
1784 || type == OP_STUB
1785#endif
1786 ) {
7766148a 1787 return o;
77ca0c92
LW		 1788 } else if (type == OP_RV2SV || /* "our" declaration */
1789 type == OP_RV2AV ||
1790 type == OP_RV2HV) { /* XXX does this let anything illegal in? */
1ce0b88c
RGS		 1791 if (cUNOPo->op_first->op_type != OP_GV) { /* MJD 20011224 */
1792 yyerror(Perl_form(aTHX_ "Can't declare %s in %s",
1793 OP_DESC(o), PL_in_my == KEY_our ? "our" : "my"));
1794 } else if (attrs) {
551405c4 1795 GV * const gv = cGVOPx_gv(cUNOPo->op_first);
1ce0b88c 1796 PL_in_my = FALSE;
5c284bb0 1797 PL_in_my_stash = NULL;
1ce0b88c
RGS		 1798 apply_attrs(GvSTASH(gv),
1799 (type == OP_RV2SV ? GvSV(gv) :
1800 type == OP_RV2AV ? (SV*)GvAV(gv) :
1801 type == OP_RV2HV ? (SV*)GvHV(gv) : (SV*)gv),
1802 attrs, FALSE);
1803 }
192587c2 1804 o->op_private |= OPpOUR_INTRO;
77ca0c92 1805 return o;
95f0a2f1
SB		 1806 }
1807 else if (type != OP_PADSV &&
93a17b20
LW		 1808 type != OP_PADAV &&
1809 type != OP_PADHV &&
1810 type != OP_PUSHMARK)
1811 {
eb64745e 1812 yyerror(Perl_form(aTHX_ "Can't declare %s in \"%s\"",
53e06cf0 1813 OP_DESC(o),
eb64745e 1814 PL_in_my == KEY_our ? "our" : "my"));
11343788 1815 return o;
93a17b20 1816 }
09bef843
SB		 1817 else if (attrs && type != OP_PUSHMARK) {
1818 HV *stash;
09bef843 1819
eb64745e 1820 PL_in_my = FALSE;
5c284bb0 1821 PL_in_my_stash = NULL;
eb64745e 1822
09bef843 1823 /* check for C<my Dog $spot> when deciding package */
dd2155a4
DM		 1824 stash = PAD_COMPNAME_TYPE(o->op_targ);
1825 if (!stash)
09bef843 1826 stash = PL_curstash;
95f0a2f1 1827 apply_attrs_my(stash, o, attrs, imopsp);
09bef843 1828 }
11343788
MB		 1829 o->op_flags |= OPf_MOD;
1830 o->op_private |= OPpLVAL_INTRO;
1831 return o;
93a17b20
LW		 1832}
1833
1834OP *
09bef843
SB		 1835Perl_my_attrs(pTHX_ OP *o, OP *attrs)
1836{
97aff369 1837 dVAR;
0bd48802 1838 OP *rops;
95f0a2f1
SB		 1839 int maybe_scalar = 0;
1840
d2be0de5 1841/* [perl #17376]: this appears to be premature, and results in code such as
c754c3d7 1842 C< our(%x); > executing in list mode rather than void mode */
d2be0de5 1843#if 0
09bef843
SB		 1844 if (o->op_flags & OPf_PARENS)
1845 list(o);
95f0a2f1
SB		 1846 else
1847 maybe_scalar = 1;
d2be0de5
YST		 1848#else
1849 maybe_scalar = 1;
1850#endif
09bef843
SB		 1851 if (attrs)
1852 SAVEFREEOP(attrs);
5f66b61c 1853 rops = NULL;
95f0a2f1
SB		 1854 o = my_kid(o, attrs, &rops);
1855 if (rops) {
1856 if (maybe_scalar && o->op_type == OP_PADSV) {
1857 o = scalar(append_list(OP_LIST, (LISTOP*)rops, (LISTOP*)o));
1858 o->op_private |= OPpLVAL_INTRO;
1859 }
1860 else
1861 o = append_list(OP_LIST, (LISTOP*)o, (LISTOP*)rops);
1862 }
eb64745e 1863 PL_in_my = FALSE;
5c284bb0 1864 PL_in_my_stash = NULL;
eb64745e 1865 return o;
09bef843
SB		 1866}
1867
1868OP *
1869Perl_my(pTHX_ OP *o)
1870{
5f66b61c 1871 return my_attrs(o, NULL);
09bef843
SB		 1872}
1873
1874OP *
864dbfa3 1875Perl_sawparens(pTHX_ OP *o)
79072805 1876{
96a5add6 1877 PERL_UNUSED_CONTEXT;
79072805
LW		 1878 if (o)
1879 o->op_flags |= OPf_PARENS;
1880 return o;
1881}
1882
1883OP *
864dbfa3 1884Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
79072805 1885{
11343788 1886 OP *o;
59f00321 1887 bool ismatchop = 0;
79072805 1888
041457d9 1889 if ( (left->op_type == OP_RV2AV ||
599cee73
PM		 1890 left->op_type == OP_RV2HV ||
1891 left->op_type == OP_PADAV ||
041457d9
DM		 1892 left->op_type == OP_PADHV)
1893 && ckWARN(WARN_MISC))
1894 {
551405c4 1895 const char * const desc = PL_op_desc[(right->op_type == OP_SUBST ||
599cee73
PM		 1896 right->op_type == OP_TRANS)
1897 ? right->op_type : OP_MATCH];
551405c4 1898 const char * const sample = ((left->op_type == OP_RV2AV ||
dff6d3cd
GS		 1899 left->op_type == OP_PADAV)
1900 ? "@array" : "%hash");
9014280d 1901 Perl_warner(aTHX_ packWARN(WARN_MISC),
1c846c1f 1902 "Applying %s to %s will act on scalar(%s)",
599cee73 1903 desc, sample, sample);
2ae324a7 1904 }
1905
5cc9e5c9
RH		 1906 if (right->op_type == OP_CONST &&
1907 cSVOPx(right)->op_private & OPpCONST_BARE &&
1908 cSVOPx(right)->op_private & OPpCONST_STRICT)
1909 {
1910 no_bareword_allowed(right);
1911 }
1912
59f00321
RGS		 1913 ismatchop = right->op_type == OP_MATCH ||
1914 right->op_type == OP_SUBST ||
1915 right->op_type == OP_TRANS;
1916 if (ismatchop && right->op_private & OPpTARGET_MY) {
1917 right->op_targ = 0;
1918 right->op_private &= ~OPpTARGET_MY;
1919 }
1920 if (!(right->op_flags & OPf_STACKED) && ismatchop) {
79072805 1921 right->op_flags |= OPf_STACKED;
6fbb66d6
NC		 1922 if (right->op_type != OP_MATCH &&
1923 ! (right->op_type == OP_TRANS &&
1924 right->op_private & OPpTRANS_IDENTICAL))
463ee0b2 1925 left = mod(left, right->op_type);
79072805 1926 if (right->op_type == OP_TRANS)
11343788 1927 o = newBINOP(OP_NULL, OPf_STACKED, scalar(left), right);
79072805 1928 else
11343788 1929 o = prepend_elem(right->op_type, scalar(left), right);
79072805 1930 if (type == OP_NOT)
11343788
MB		 1931 return newUNOP(OP_NOT, 0, scalar(o));
1932 return o;
79072805
LW		 1933 }
1934 else
1935 return bind_match(type, left,
131b3ad0 1936 pmruntime(newPMOP(OP_MATCH, 0), right, 0));
79072805
LW		 1937}
1938
1939OP *
864dbfa3 1940Perl_invert(pTHX_ OP *o)
79072805 1941{
11343788 1942 if (!o)
1d866c12 1943 return NULL;
11343788 1944 return newUNOP(OP_NOT, OPf_SPECIAL, scalar(o));
79072805
LW		 1945}
1946
1947OP *
864dbfa3 1948Perl_scope(pTHX_ OP *o)
79072805 1949{
27da23d5 1950 dVAR;
79072805 1951 if (o) {
3280af22 1952 if (o->op_flags & OPf_PARENS || PERLDB_NOOPT || PL_tainting) {
463ee0b2
LW		 1953 o = prepend_elem(OP_LINESEQ, newOP(OP_ENTER, 0), o);
1954 o->op_type = OP_LEAVE;
22c35a8c 1955 o->op_ppaddr = PL_ppaddr[OP_LEAVE];
463ee0b2 1956 }
fdb22418
HS		 1957 else if (o->op_type == OP_LINESEQ) {
1958 OP *kid;
1959 o->op_type = OP_SCOPE;
1960 o->op_ppaddr = PL_ppaddr[OP_SCOPE];
1961 kid = ((LISTOP*)o)->op_first;
59110972 1962 if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE) {
fdb22418 1963 op_null(kid);
59110972
RH		 1964
1965 /* The following deals with things like 'do {1 for 1}' */
1966 kid = kid->op_sibling;
1967 if (kid &&
1968 (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE))
1969 op_null(kid);
1970 }
463ee0b2 1971 }
fdb22418 1972 else
5f66b61c 1973 o = newLISTOP(OP_SCOPE, 0, o, NULL);
79072805
LW		 1974 }
1975 return o;
1976}
72dc9ed5 1977
a0d0e21e 1978int
864dbfa3 1979Perl_block_start(pTHX_ int full)
79072805 1980{
97aff369 1981 dVAR;
73d840c0 1982 const int retval = PL_savestack_ix;
dd2155a4 1983 pad_block_start(full);
b3ac6de7 1984 SAVEHINTS();
3280af22 1985 PL_hints &= ~HINT_BLOCK_SCOPE;
68da3b2f 1986 SAVECOMPILEWARNINGS();
72dc9ed5 1987 PL_compiling.cop_warnings = DUP_WARNINGS(PL_compiling.cop_warnings);
ac27b0f5
NIS		 1988 SAVESPTR(PL_compiling.cop_io);
1989 if (! specialCopIO(PL_compiling.cop_io)) {
1990 PL_compiling.cop_io = newSVsv(PL_compiling.cop_io) ;
1991 SAVEFREESV(PL_compiling.cop_io) ;
1992 }
a0d0e21e
LW		 1993 return retval;
1994}
1995
1996OP*
864dbfa3 1997Perl_block_end(pTHX_ I32 floor, OP *seq)
a0d0e21e 1998{
97aff369 1999 dVAR;
6867be6d 2000 const int needblockscope = PL_hints & HINT_BLOCK_SCOPE;
551405c4 2001 OP* const retval = scalarseq(seq);
e9818f4e 2002 LEAVE_SCOPE(floor);
623e6609 2003 CopHINTS_set(&PL_compiling, PL_hints);
a0d0e21e 2004 if (needblockscope)
3280af22 2005 PL_hints |= HINT_BLOCK_SCOPE; /* propagate out */
dd2155a4 2006 pad_leavemy();
a0d0e21e
LW		 2007 return retval;
2008}
2009
76e3520e 2010STATIC OP *
cea2e8a9 2011S_newDEFSVOP(pTHX)
54b9620d 2012{
97aff369 2013 dVAR;
6867be6d 2014 const I32 offset = pad_findmy("$_");
00b1698f 2015 if (offset == NOT_IN_PAD || PAD_COMPNAME_FLAGS_isOUR(offset)) {
59f00321
RGS		 2016 return newSVREF(newGVOP(OP_GV, 0, PL_defgv));
2017 }
2018 else {
551405c4 2019 OP * const o = newOP(OP_PADSV, 0);
59f00321
RGS		 2020 o->op_targ = offset;
2021 return o;
2022 }
54b9620d
MB		 2023}
2024
a0d0e21e 2025void
864dbfa3 2026Perl_newPROG(pTHX_ OP *o)
a0d0e21e 2027{
97aff369 2028 dVAR;
3280af22 2029 if (PL_in_eval) {
b295d113
TH		 2030 if (PL_eval_root)
2031 return;
faef0170
HS		 2032 PL_eval_root = newUNOP(OP_LEAVEEVAL,
2033 ((PL_in_eval & EVAL_KEEPERR)
2034 ? OPf_SPECIAL : 0), o);
3280af22 2035 PL_eval_start = linklist(PL_eval_root);
7934575e
GS		 2036 PL_eval_root->op_private |= OPpREFCOUNTED;
2037 OpREFCNT_set(PL_eval_root, 1);
3280af22 2038 PL_eval_root->op_next = 0;
a2efc822 2039 CALL_PEEP(PL_eval_start);
a0d0e21e
LW		 2040 }
2041 else {
6be89cf9
AE		 2042 if (o->op_type == OP_STUB) {
2043 PL_comppad_name = 0;
2044 PL_compcv = 0;
2a4f803a 2045 FreeOp(o);
a0d0e21e 2046 return;
6be89cf9 2047 }
3280af22
NIS		 2048 PL_main_root = scope(sawparens(scalarvoid(o)));
2049 PL_curcop = &PL_compiling;
2050 PL_main_start = LINKLIST(PL_main_root);
7934575e
GS		 2051 PL_main_root->op_private |= OPpREFCOUNTED;
2052 OpREFCNT_set(PL_main_root, 1);
3280af22 2053 PL_main_root->op_next = 0;
a2efc822 2054 CALL_PEEP(PL_main_start);
3280af22 2055 PL_compcv = 0;
3841441e 2056
4fdae800 2057 /* Register with debugger */
84902520 2058 if (PERLDB_INTER) {
551405c4 2059 CV * const cv = get_cv("DB::postponed", FALSE);
3841441e
CS		 2060 if (cv) {
2061 dSP;
924508f0 2062 PUSHMARK(SP);
cc49e20b 2063 XPUSHs((SV*)CopFILEGV(&PL_compiling));
3841441e 2064 PUTBACK;
864dbfa3 2065 call_sv((SV*)cv, G_DISCARD);
3841441e
CS		 2066 }
2067 }
79072805 2068 }
79072805
LW		 2069}
2070
2071OP *
864dbfa3 2072Perl_localize(pTHX_ OP *o, I32 lex)
79072805 2073{
97aff369 2074 dVAR;
79072805 2075 if (o->op_flags & OPf_PARENS)
d2be0de5
YST		 2076/* [perl #17376]: this appears to be premature, and results in code such as
2077 C< our(%x); > executing in list mode rather than void mode */
2078#if 0
79072805 2079 list(o);
d2be0de5 2080#else
bb263b4e 2081 /*EMPTY*/;
d2be0de5 2082#endif
8990e307 2083 else {
041457d9
DM		 2084 if ( PL_bufptr > PL_oldbufptr && PL_bufptr[-1] == ','
2085 && ckWARN(WARN_PARENTHESIS))
64420d0d
JH		 2086 {
2087 char *s = PL_bufptr;
bac662ee 2088 bool sigil = FALSE;
64420d0d 2089
8473848f 2090 /* some heuristics to detect a potential error */
bac662ee 2091 while (*s && (strchr(", \t\n", *s)))
64420d0d 2092 s++;
8473848f 2093
bac662ee
TS		 2094 while (1) {
2095 if (*s && strchr("@$%*", *s) && *++s
2096 && (isALNUM(*s) || UTF8_IS_CONTINUED(*s))) {
2097 s++;
2098 sigil = TRUE;
2099 while (*s && (isALNUM(*s) || UTF8_IS_CONTINUED(*s)))
2100 s++;
2101 while (*s && (strchr(", \t\n", *s)))
2102 s++;
2103 }
2104 else
2105 break;
2106 }
2107 if (sigil && (*s == ';' || *s == '=')) {
2108 Perl_warner(aTHX_ packWARN(WARN_PARENTHESIS),
8473848f
RGS		 2109 "Parentheses missing around \"%s\" list",
2110 lex ? (PL_in_my == KEY_our ? "our" : "my")
2111 : "local");
2112 }
8990e307
LW		 2113 }
2114 }
93a17b20 2115 if (lex)
eb64745e 2116 o = my(o);
93a17b20 2117 else
eb64745e
GS		 2118 o = mod(o, OP_NULL); /* a bit kludgey */
2119 PL_in_my = FALSE;
5c284bb0 2120 PL_in_my_stash = NULL;
eb64745e 2121 return o;
79072805
LW		 2122}
2123
2124OP *
864dbfa3 2125Perl_jmaybe(pTHX_ OP *o)
79072805
LW		 2126{
2127 if (o->op_type == OP_LIST) {
fafc274c 2128 OP * const o2
d4c19fe8 2129 = newSVREF(newGVOP(OP_GV, 0, gv_fetchpvs(";", GV_ADD|GV_NOTQUAL, SVt_PV)));
554b3eca 2130 o = convert(OP_JOIN, 0, prepend_elem(OP_LIST, o2, o));
79072805
LW		 2131 }
2132 return o;
2133}
2134
2135OP *
864dbfa3 2136Perl_fold_constants(pTHX_ register OP *o)
79072805 2137{
27da23d5 2138 dVAR;
79072805 2139 register OP *curop;
eb8433b7 2140 OP *newop;
79072805 2141 I32 type = o->op_type;
de5e01c2 2142 SV *sv = NULL;
b7f7fd0b
NC		 2143 int ret = 0;
2144 I32 oldscope;
2145 OP *old_next;
2146 dJMPENV;
79072805 2147
22c35a8c 2148 if (PL_opargs[type] & OA_RETSCALAR)
79072805 2149 scalar(o);
b162f9ea 2150 if (PL_opargs[type] & OA_TARGET && !o->op_targ)
ed6116ce 2151 o->op_targ = pad_alloc(type, SVs_PADTMP);
79072805 2152
eac055e9
GS		 2153 /* integerize op, unless it happens to be C<-foo>.
2154 * XXX should pp_i_negate() do magic string negation instead? */
2155 if ((PL_opargs[type] & OA_OTHERINT) && (PL_hints & HINT_INTEGER)
2156 && !(type == OP_NEGATE && cUNOPo->op_first->op_type == OP_CONST
2157 && (cUNOPo->op_first->op_private & OPpCONST_BARE)))
2158 {
22c35a8c 2159 o->op_ppaddr = PL_ppaddr[type = ++(o->op_type)];
eac055e9 2160 }
85e6fe83 2161
22c35a8c 2162 if (!(PL_opargs[type] & OA_FOLDCONST))
79072805
LW		 2163 goto nope;
2164
de939608 2165 switch (type) {
7a52d87a
GS		 2166 case OP_NEGATE:
2167 /* XXX might want a ck_negate() for this */
2168 cUNOPo->op_first->op_private &= ~OPpCONST_STRICT;
2169 break;
de939608
CS		 2170 case OP_UCFIRST:
2171 case OP_LCFIRST:
2172 case OP_UC:
2173 case OP_LC:
69dcf70c
MB		 2174 case OP_SLT:
2175 case OP_SGT:
2176 case OP_SLE:
2177 case OP_SGE:
2178 case OP_SCMP:
2de3dbcc
JH		 2179 /* XXX what about the numeric ops? */
2180 if (PL_hints & HINT_LOCALE)
de939608
CS		 2181 goto nope;
2182 }
2183
3280af22 2184 if (PL_error_count)
a0d0e21e
LW		 2185 goto nope; /* Don't try to run w/ errors */
2186
79072805 2187 for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
11fa937b
GS		 2188 if ((curop->op_type != OP_CONST ||
2189 (curop->op_private & OPpCONST_BARE)) &&
7a52d87a
GS		 2190 curop->op_type != OP_LIST &&
2191 curop->op_type != OP_SCALAR &&
2192 curop->op_type != OP_NULL &&
2193 curop->op_type != OP_PUSHMARK)
2194 {
79072805
LW		 2195 goto nope;
2196 }
2197 }
2198
2199 curop = LINKLIST(o);
b7f7fd0b 2200 old_next = o->op_next;
79072805 2201 o->op_next = 0;
533c011a 2202 PL_op = curop;
b7f7fd0b
NC		 2203
2204 oldscope = PL_scopestack_ix;
edb2152a 2205 create_eval_scope(G_FAKINGEVAL);
b7f7fd0b 2206
b7f7fd0b
NC		 2207 JMPENV_PUSH(ret);
2208
2209 switch (ret) {
2210 case 0:
2211 CALLRUNOPS(aTHX);
2212 sv = *(PL_stack_sp--);
2213 if (o->op_targ && sv == PAD_SV(o->op_targ)) /* grab pad temp? */
2214 pad_swipe(o->op_targ, FALSE);
2215 else if (SvTEMP(sv)) { /* grab mortal temp? */
2216 SvREFCNT_inc_simple_void(sv);
2217 SvTEMP_off(sv);
2218 }
2219 break;
2220 case 3:
2221 /* Something tried to die. Abandon constant folding. */
2222 /* Pretend the error never happened. */
2223 sv_setpvn(ERRSV,"",0);
2224 o->op_next = old_next;
2225 break;
2226 default:
2227 JMPENV_POP;
2228 /* Don't expect 1 (setjmp failed) or 2 (something called my_exit) */
2229 Perl_croak(aTHX_ "panic: fold_constants JMPENV_PUSH returned %d", ret);
2230 }
2231
2232 JMPENV_POP;
edb2152a
NC		 2233
2234 if (PL_scopestack_ix > oldscope)
2235 delete_eval_scope();
eb8433b7 2236
b7f7fd0b
NC		 2237 if (ret)
2238 goto nope;
2239
eb8433b7 2240#ifndef PERL_MAD
79072805 2241 op_free(o);
eb8433b7 2242#endif
de5e01c2 2243 assert(sv);
79072805 2244 if (type == OP_RV2GV)
eb8433b7
NC		 2245 newop = newGVOP(OP_GV, 0, (GV*)sv);
2246 else
2247 newop = newSVOP(OP_CONST, 0, sv);
2248 op_getmad(o,newop,'f');
2249 return newop;
aeea060c 2250
b7f7fd0b 2251 nope:
79072805
LW		 2252 return o;
2253}
2254
2255OP *
864dbfa3 2256Perl_gen_constant_list(pTHX_ register OP *o)
79072805 2257{
27da23d5 2258 dVAR;
79072805 2259 register OP *curop;
6867be6d 2260 const I32 oldtmps_floor = PL_tmps_floor;
79072805 2261
a0d0e21e 2262 list(o);
3280af22 2263 if (PL_error_count)
a0d0e21e
LW		 2264 return o; /* Don't attempt to run with errors */
2265
533c011a 2266 PL_op = curop = LINKLIST(o);
a0d0e21e 2267 o->op_next = 0;
a2efc822 2268 CALL_PEEP(curop);
cea2e8a9
GS		 2269 pp_pushmark();
2270 CALLRUNOPS(aTHX);
533c011a 2271 PL_op = curop;
cea2e8a9 2272 pp_anonlist();
3280af22 2273 PL_tmps_floor = oldtmps_floor;
79072805
LW		 2274
2275 o->op_type = OP_RV2AV;
22c35a8c 2276 o->op_ppaddr = PL_ppaddr[OP_RV2AV];
fb53bbb2
SG		 2277 o->op_flags &= ~OPf_REF; /* treat \(1..2) like an ordinary list */
2278 o->op_flags |= OPf_PARENS; /* and flatten \(1..2,3) */
2814eb74 2279 o->op_opt = 0; /* needs to be revisited in peep() */
79072805 2280 curop = ((UNOP*)o)->op_first;
b37c2d43 2281 ((UNOP*)o)->op_first = newSVOP(OP_CONST, 0, SvREFCNT_inc_NN(*PL_stack_sp--));
eb8433b7
NC		 2282#ifdef PERL_MAD
2283 op_getmad(curop,o,'O');
2284#else
79072805 2285 op_free(curop);
eb8433b7 2286#endif
79072805
LW		 2287 linklist(o);
2288 return list(o);
2289}
2290
2291OP *
864dbfa3 2292Perl_convert(pTHX_ I32 type, I32 flags, OP *o)
79072805 2293{
27da23d5 2294 dVAR;
11343788 2295 if (!o || o->op_type != OP_LIST)
5f66b61c 2296 o = newLISTOP(OP_LIST, 0, o, NULL);
748a9306 2297 else
5dc0d613 2298 o->op_flags &= ~OPf_WANT;
79072805 2299
22c35a8c 2300 if (!(PL_opargs[type] & OA_MARK))
93c66552 2301 op_null(cLISTOPo->op_first);
8990e307 2302
eb160463 2303 o->op_type = (OPCODE)type;
22c35a8c 2304 o->op_ppaddr = PL_ppaddr[type];
11343788 2305 o->op_flags |= flags;
79072805 2306
11343788 2307 o = CHECKOP(type, o);
fe2774ed 2308 if (o->op_type != (unsigned)type)
11343788 2309 return o;
79072805 2310
11343788 2311 return fold_constants(o);
79072805
LW		 2312}
2313
2314/* List constructors */
2315
2316OP *
864dbfa3 2317Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2318{
2319 if (!first)
2320 return last;
8990e307
LW		 2321
2322 if (!last)
79072805 2323 return first;
8990e307 2324
fe2774ed 2325 if (first->op_type != (unsigned)type
155aba94
GS		 2326 || (type == OP_LIST && (first->op_flags & OPf_PARENS)))
2327 {
2328 return newLISTOP(type, 0, first, last);
2329 }
79072805 2330
a0d0e21e
LW		 2331 if (first->op_flags & OPf_KIDS)
2332 ((LISTOP*)first)->op_last->op_sibling = last;
2333 else {
2334 first->op_flags |= OPf_KIDS;
2335 ((LISTOP*)first)->op_first = last;
2336 }
2337 ((LISTOP*)first)->op_last = last;
a0d0e21e 2338 return first;
79072805
LW		 2339}
2340
2341OP *
864dbfa3 2342Perl_append_list(pTHX_ I32 type, LISTOP *first, LISTOP *last)
79072805
LW		 2343{
2344 if (!first)
2345 return (OP*)last;
8990e307
LW		 2346
2347 if (!last)
79072805 2348 return (OP*)first;
8990e307 2349
fe2774ed 2350 if (first->op_type != (unsigned)type)
79072805 2351 return prepend_elem(type, (OP*)first, (OP*)last);
8990e307 2352
fe2774ed 2353 if (last->op_type != (unsigned)type)
79072805
LW		 2354 return append_elem(type, (OP*)first, (OP*)last);
2355
2356 first->op_last->op_sibling = last->op_first;
2357 first->op_last = last->op_last;
117dada2 2358 first->op_flags |= (last->op_flags & OPf_KIDS);
1c846c1f 2359
eb8433b7
NC		 2360#ifdef PERL_MAD
2361 if (last->op_first && first->op_madprop) {
2362 MADPROP *mp = last->op_first->op_madprop;
2363 if (mp) {
2364 while (mp->mad_next)
2365 mp = mp->mad_next;
2366 mp->mad_next = first->op_madprop;
2367 }
2368 else {
2369 last->op_first->op_madprop = first->op_madprop;
2370 }
2371 }
2372 first->op_madprop = last->op_madprop;
2373 last->op_madprop = 0;
2374#endif
2375
238a4c30
NIS		 2376 FreeOp(last);
2377
79072805
LW		 2378 return (OP*)first;
2379}
2380
2381OP *
864dbfa3 2382Perl_prepend_elem(pTHX_ I32 type, OP *first, OP *last)
79072805
LW		 2383{
2384 if (!first)
2385 return last;
8990e307
LW		 2386
2387 if (!last)
79072805 2388 return first;
8990e307 2389
fe2774ed 2390 if (last->op_type == (unsigned)type) {
8990e307
LW		 2391 if (type == OP_LIST) { /* already a PUSHMARK there */
2392 first->op_sibling = ((LISTOP*)last)->op_first->op_sibling;
2393 ((LISTOP*)last)->op_first->op_sibling = first;
36a5d4ba
DC		 2394 if (!(first->op_flags & OPf_PARENS))
2395 last->op_flags &= ~OPf_PARENS;
8990e307
LW		 2396 }
2397 else {
2398 if (!(last->op_flags & OPf_KIDS)) {
2399 ((LISTOP*)last)->op_last = first;
2400 last->op_flags |= OPf_KIDS;
2401 }
2402 first->op_sibling = ((LISTOP*)last)->op_first;
2403 ((LISTOP*)last)->op_first = first;
79072805 2404 }
117dada2 2405 last->op_flags |= OPf_KIDS;
79072805
LW		 2406 return last;
2407 }
2408
2409 return newLISTOP(type, 0, first, last);
2410}
2411
2412/* Constructors */
2413
eb8433b7
NC		 2414#ifdef PERL_MAD
2415
2416TOKEN *
2417Perl_newTOKEN(pTHX_ I32 optype, YYSTYPE lval, MADPROP* madprop)
2418{
2419 TOKEN *tk;
99129197 2420 Newxz(tk, 1, TOKEN);
eb8433b7
NC		 2421 tk->tk_type = (OPCODE)optype;
2422 tk->tk_type = 12345;
2423 tk->tk_lval = lval;
2424 tk->tk_mad = madprop;
2425 return tk;
2426}
2427
2428void
2429Perl_token_free(pTHX_ TOKEN* tk)
2430{
2431 if (tk->tk_type != 12345)
2432 return;
2433 mad_free(tk->tk_mad);
2434 Safefree(tk);
2435}
2436
2437void
2438Perl_token_getmad(pTHX_ TOKEN* tk, OP* o, char slot)
2439{
2440 MADPROP* mp;
2441 MADPROP* tm;
2442 if (tk->tk_type != 12345) {
2443 Perl_warner(aTHX_ packWARN(WARN_MISC),
2444 "Invalid TOKEN object ignored");
2445 return;
2446 }
2447 tm = tk->tk_mad;
2448 if (!tm)
2449 return;
2450
2451 /* faked up qw list? */
2452 if (slot == '(' &&
2453 tm->mad_type == MAD_SV &&
2454 SvPVX((SV*)tm->mad_val)[0] == 'q')
2455 slot = 'x';
2456
2457 if (o) {
2458 mp = o->op_madprop;
2459 if (mp) {
2460 for (;;) {
2461 /* pretend constant fold didn't happen? */
2462 if (mp->mad_key == 'f' &&
2463 (o->op_type == OP_CONST ||
2464 o->op_type == OP_GV) )
2465 {
2466 token_getmad(tk,(OP*)mp->mad_val,slot);
2467 return;
2468 }
2469 if (!mp->mad_next)
2470 break;
2471 mp = mp->mad_next;
2472 }
2473 mp->mad_next = tm;
2474 mp = mp->mad_next;
2475 }
2476 else {
2477 o->op_madprop = tm;
2478 mp = o->op_madprop;
2479 }
2480 if (mp->mad_key == 'X')
2481 mp->mad_key = slot; /* just change the first one */
2482
2483 tk->tk_mad = 0;
2484 }
2485 else
2486 mad_free(tm);
2487 Safefree(tk);
2488}
2489
2490void
2491Perl_op_getmad_weak(pTHX_ OP* from, OP* o, char slot)
2492{
2493 MADPROP* mp;
2494 if (!from)
2495 return;
2496 if (o) {
2497 mp = o->op_madprop;
2498 if (mp) {
2499 for (;;) {
2500 /* pretend constant fold didn't happen? */
2501 if (mp->mad_key == 'f' &&
2502 (o->op_type == OP_CONST ||
2503 o->op_type == OP_GV) )
2504 {
2505 op_getmad(from,(OP*)mp->mad_val,slot);
2506 return;
2507 }
2508 if (!mp->mad_next)
2509 break;
2510 mp = mp->mad_next;
2511 }
2512 mp->mad_next = newMADPROP(slot,MAD_OP,from,0);
2513 }
2514 else {
2515 o->op_madprop = newMADPROP(slot,MAD_OP,from,0);
2516 }
2517 }
2518}
2519
2520void
2521Perl_op_getmad(pTHX_ OP* from, OP* o, char slot)
2522{
2523 MADPROP* mp;
2524 if (!from)
2525 return;
2526 if (o) {
2527 mp = o->op_madprop;
2528 if (mp) {
2529 for (;;) {
2530 /* pretend constant fold didn't happen? */
2531 if (mp->mad_key == 'f' &&
2532 (o->op_type == OP_CONST ||
2533 o->op_type == OP_GV) )
2534 {
2535 op_getmad(from,(OP*)mp->mad_val,slot);
2536 return;
2537 }
2538 if (!mp->mad_next)
2539 break;
2540 mp = mp->mad_next;
2541 }
2542 mp->mad_next = newMADPROP(slot,MAD_OP,from,1);
2543 }
2544 else {
2545 o->op_madprop = newMADPROP(slot,MAD_OP,from,1);
2546 }
2547 }
2548 else {
99129197
NC		 2549 PerlIO_printf(PerlIO_stderr(),
2550 "DESTROYING op = %0"UVxf"\n", PTR2UV(from));
eb8433b7
NC		 2551 op_free(from);
2552 }
2553}
2554
2555void
2556Perl_prepend_madprops(pTHX_ MADPROP* mp, OP* o, char slot)
2557{
2558 MADPROP* tm;
2559 if (!mp || !o)
2560 return;
2561 if (slot)
2562 mp->mad_key = slot;
2563 tm = o->op_madprop;
2564 o->op_madprop = mp;
2565 for (;;) {
2566 if (!mp->mad_next)
2567 break;
2568 mp = mp->mad_next;
2569 }
2570 mp->mad_next = tm;
2571}
2572
2573void
2574Perl_append_madprops(pTHX_ MADPROP* tm, OP* o, char slot)
2575{
2576 if (!o)
2577 return;
2578 addmad(tm, &(o->op_madprop), slot);
2579}
2580
2581void
2582Perl_addmad(pTHX_ MADPROP* tm, MADPROP** root, char slot)
2583{
2584 MADPROP* mp;
2585 if (!tm || !root)
2586 return;
2587 if (slot)
2588 tm->mad_key = slot;
2589 mp = *root;
2590 if (!mp) {
2591 *root = tm;
2592 return;
2593 }
2594 for (;;) {
2595 if (!mp->mad_next)
2596 break;
2597 mp = mp->mad_next;
2598 }
2599 mp->mad_next = tm;
2600}
2601
2602MADPROP *
2603Perl_newMADsv(pTHX_ char key, SV* sv)
2604{
2605 return newMADPROP(key, MAD_SV, sv, 0);
2606}
2607
2608MADPROP *
2609Perl_newMADPROP(pTHX_ char key, char type, void* val, I32 vlen)
2610{
2611 MADPROP *mp;
99129197 2612 Newxz(mp, 1, MADPROP);
eb8433b7
NC		 2613 mp->mad_next = 0;
2614 mp->mad_key = key;
2615 mp->mad_vlen = vlen;
2616 mp->mad_type = type;
2617 mp->mad_val = val;
2618/* PerlIO_printf(PerlIO_stderr(), "NEW mp = %0x\n", mp); */
2619 return mp;
2620}
2621
2622void
2623Perl_mad_free(pTHX_ MADPROP* mp)
2624{
2625/* PerlIO_printf(PerlIO_stderr(), "FREE mp = %0x\n", mp); */
2626 if (!mp)
2627 return;
2628 if (mp->mad_next)
2629 mad_free(mp->mad_next);
2630/* if (PL_lex_state != LEX_NOTPARSING && mp->mad_vlen)
2631 PerlIO_printf(PerlIO_stderr(), "DESTROYING '%c'=<%s>\n", mp->mad_key & 255, mp->mad_val); */
2632 switch (mp->mad_type) {
2633 case MAD_NULL:
2634 break;
2635 case MAD_PV:
2636 Safefree((char*)mp->mad_val);
2637 break;
2638 case MAD_OP:
2639 if (mp->mad_vlen) /* vlen holds "strong/weak" boolean */
2640 op_free((OP*)mp->mad_val);
2641 break;
2642 case MAD_SV:
2643 sv_free((SV*)mp->mad_val);
2644 break;
2645 default:
2646 PerlIO_printf(PerlIO_stderr(), "Unrecognized mad\n");
2647 break;
2648 }
2649 Safefree(mp);
2650}
2651
2652#endif
2653
79072805 2654OP *
864dbfa3 2655Perl_newNULLLIST(pTHX)
79072805 2656{
8990e307
LW		 2657 return newOP(OP_STUB, 0);
2658}
2659
2660OP *
864dbfa3 2661Perl_force_list(pTHX_ OP *o)
8990e307 2662{
11343788 2663 if (!o || o->op_type != OP_LIST)
5f66b61c 2664 o = newLISTOP(OP_LIST, 0, o, NULL);
93c66552 2665 op_null(o);
11343788 2666 return o;
79072805
LW		 2667}
2668
2669OP *
864dbfa3 2670Perl_newLISTOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805 2671{
27da23d5 2672 dVAR;
79072805
LW		 2673 LISTOP *listop;
2674
b7dc083c 2675 NewOp(1101, listop, 1, LISTOP);
79072805 2676
eb160463 2677 listop->op_type = (OPCODE)type;
22c35a8c 2678 listop->op_ppaddr = PL_ppaddr[type];
117dada2
SM		 2679 if (first || last)
2680 flags |= OPf_KIDS;
eb160463 2681 listop->op_flags = (U8)flags;
79072805
LW		 2682
2683 if (!last && first)
2684 last = first;
2685 else if (!first && last)
2686 first = last;
8990e307
LW		 2687 else if (first)
2688 first->op_sibling = last;
79072805
LW		 2689 listop->op_first = first;
2690 listop->op_last = last;
8990e307 2691 if (type == OP_LIST) {
551405c4 2692 OP* const pushop = newOP(OP_PUSHMARK, 0);
8990e307
LW		 2693 pushop->op_sibling = first;
2694 listop->op_first = pushop;
2695 listop->op_flags |= OPf_KIDS;
2696 if (!last)
2697 listop->op_last = pushop;
2698 }
79072805 2699
463d09e6 2700 return CHECKOP(type, listop);
79072805
LW		 2701}
2702
2703OP *
864dbfa3 2704Perl_newOP(pTHX_ I32 type, I32 flags)
79072805 2705{
27da23d5 2706 dVAR;
11343788 2707 OP *o;
b7dc083c 2708 NewOp(1101, o, 1, OP);
eb160463 2709 o->op_type = (OPCODE)type;
22c35a8c 2710 o->op_ppaddr = PL_ppaddr[type];
eb160463 2711 o->op_flags = (U8)flags;
79072805 2712
11343788 2713 o->op_next = o;
eb160463 2714 o->op_private = (U8)(0 | (flags >> 8));
22c35a8c 2715 if (PL_opargs[type] & OA_RETSCALAR)
11343788 2716 scalar(o);
22c35a8c 2717 if (PL_opargs[type] & OA_TARGET)
11343788
MB		 2718 o->op_targ = pad_alloc(type, SVs_PADTMP);
2719 return CHECKOP(type, o);
79072805
LW		 2720}
2721
2722OP *
864dbfa3 2723Perl_newUNOP(pTHX_ I32 type, I32 flags, OP *first)
79072805 2724{
27da23d5 2725 dVAR;
79072805
LW		 2726 UNOP *unop;
2727
93a17b20 2728 if (!first)
aeea060c 2729 first = newOP(OP_STUB, 0);
22c35a8c 2730 if (PL_opargs[type] & OA_MARK)
8990e307 2731 first = force_list(first);
93a17b20 2732
b7dc083c 2733 NewOp(1101, unop, 1, UNOP);
eb160463 2734 unop->op_type = (OPCODE)type;
22c35a8c 2735 unop->op_ppaddr = PL_ppaddr[type];
79072805 2736 unop->op_first = first;
585ec06d 2737 unop->op_flags = (U8)(flags | OPf_KIDS);
eb160463 2738 unop->op_private = (U8)(1 | (flags >> 8));
e50aee73 2739 unop = (UNOP*) CHECKOP(type, unop);
79072805
LW		 2740 if (unop->op_next)
2741 return (OP*)unop;
2742
a0d0e21e 2743 return fold_constants((OP *) unop);
79072805
LW		 2744}
2745
2746OP *
864dbfa3 2747Perl_newBINOP(pTHX_ I32 type, I32 flags, OP *first, OP *last)
79072805 2748{
27da23d5 2749 dVAR;
79072805 2750 BINOP *binop;
b7dc083c 2751 NewOp(1101, binop, 1, BINOP);
79072805
LW		 2752
2753 if (!first)
2754 first = newOP(OP_NULL, 0);
2755
eb160463 2756 binop->op_type = (OPCODE)type;
22c35a8c 2757 binop->op_ppaddr = PL_ppaddr[type];
79072805 2758 binop->op_first = first;
585ec06d 2759 binop->op_flags = (U8)(flags | OPf_KIDS);
79072805
LW		 2760 if (!last) {
2761 last = first;
eb160463 2762 binop->op_private = (U8)(1 | (flags >> 8));
79072805
LW		 2763 }
2764 else {
eb160463 2765 binop->op_private = (U8)(2 | (flags >> 8));
79072805
LW		 2766 first->op_sibling = last;
2767 }
2768
e50aee73 2769 binop = (BINOP*)CHECKOP(type, binop);
eb160463 2770 if (binop->op_next || binop->op_type != (OPCODE)type)
79072805
LW		 2771 return (OP*)binop;
2772
7284ab6f 2773 binop->op_last = binop->op_first->op_sibling;
79072805 2774
a0d0e21e 2775 return fold_constants((OP *)binop);
79072805
LW		 2776}
2777
5f66b61c
AL		 2778static int uvcompare(const void *a, const void *b)
2779 __attribute__nonnull__(1)
2780 __attribute__nonnull__(2)
2781 __attribute__pure__;
abb2c242 2782static int uvcompare(const void *a, const void *b)
2b9d42f0 2783{
e1ec3a88 2784 if (*((const UV *)a) < (*(const UV *)b))
2b9d42f0 2785 return -1;
e1ec3a88 2786 if (*((const UV *)a) > (*(const UV *)b))
2b9d42f0 2787 return 1;
e1ec3a88 2788 if (*((const UV *)a+1) < (*(const UV *)b+1))
2b9d42f0 2789 return -1;
e1ec3a88 2790 if (*((const UV *)a+1) > (*(const UV *)b+1))
2b9d42f0 2791 return 1;
a0ed51b3
LW		 2792 return 0;
2793}
2794
79072805 2795OP *
864dbfa3 2796Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
79072805 2797{
97aff369 2798 dVAR;
2d03de9c
AL		 2799 SV * const tstr = ((SVOP*)expr)->op_sv;
2800 SV * const rstr = ((SVOP*)repl)->op_sv;
463ee0b2
LW		 2801 STRLEN tlen;
2802 STRLEN rlen;
5c144d81
NC		 2803 const U8 *t = (U8*)SvPV_const(tstr, tlen);
2804 const U8 *r = (U8*)SvPV_const(rstr, rlen);
79072805
LW		 2805 register I32 i;
2806 register I32 j;
9b877dbb 2807 I32 grows = 0;
79072805
LW		 2808 register short *tbl;
2809
551405c4
AL		 2810 const I32 complement = o->op_private & OPpTRANS_COMPLEMENT;
2811 const I32 squash = o->op_private & OPpTRANS_SQUASH;
2812 I32 del = o->op_private & OPpTRANS_DELETE;
800b4dc4 2813 PL_hints |= HINT_BLOCK_SCOPE;
1c846c1f 2814
036b4402
GS		 2815 if (SvUTF8(tstr))
2816 o->op_private |= OPpTRANS_FROM_UTF;
1c846c1f
NIS		 2817
2818 if (SvUTF8(rstr))
036b4402 2819 o->op_private |= OPpTRANS_TO_UTF;
79072805 2820
a0ed51b3 2821 if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
396482e1 2822 SV* const listsv = newSVpvs("# comment\n");
c445ea15 2823 SV* transv = NULL;
5c144d81
NC		 2824 const U8* tend = t + tlen;
2825 const U8* rend = r + rlen;
ba210ebe 2826 STRLEN ulen;
84c133a0
RB		 2827 UV tfirst = 1;
2828 UV tlast = 0;
2829 IV tdiff;
2830 UV rfirst = 1;
2831 UV rlast = 0;
2832 IV rdiff;
2833 IV diff;
a0ed51b3
LW		 2834 I32 none = 0;
2835 U32 max = 0;
2836 I32 bits;
a0ed51b3 2837 I32 havefinal = 0;
9c5ffd7c 2838 U32 final = 0;
551405c4
AL		 2839 const I32 from_utf = o->op_private & OPpTRANS_FROM_UTF;
2840 const I32 to_utf = o->op_private & OPpTRANS_TO_UTF;
bf4a1e57
JH		 2841 U8* tsave = NULL;
2842 U8* rsave = NULL;
9f7f3913 2843 const U32 flags = UTF8_ALLOW_DEFAULT;
bf4a1e57
JH		 2844
2845 if (!from_utf) {
2846 STRLEN len = tlen;
5c144d81 2847 t = tsave = bytes_to_utf8(t, &len);
bf4a1e57
JH		 2848 tend = t + len;
2849 }
2850 if (!to_utf && rlen) {
2851 STRLEN len = rlen;
5c144d81 2852 r = rsave = bytes_to_utf8(r, &len);
bf4a1e57
JH		 2853 rend = r + len;
2854 }
a0ed51b3 2855
2b9d42f0
NIS		 2856/* There are several snags with this code on EBCDIC:
2857 1. 0xFF is a legal UTF-EBCDIC byte (there are no illegal bytes).
2858 2. scan_const() in toke.c has encoded chars in native encoding which makes
2859 ranges at least in EBCDIC 0..255 range the bottom odd.
2860*/
2861
a0ed51b3 2862 if (complement) {
89ebb4a3 2863 U8 tmpbuf[UTF8_MAXBYTES+1];
2b9d42f0 2864 UV *cp;
a0ed51b3 2865 UV nextmin = 0;
a02a5408 2866 Newx(cp, 2*tlen, UV);
a0ed51b3 2867 i = 0;
396482e1 2868 transv = newSVpvs("");
a0ed51b3 2869 while (t < tend) {
9f7f3913 2870 cp[2*i] = utf8n_to_uvuni(t, tend-t, &ulen, flags);
2b9d42f0
NIS		 2871 t += ulen;
2872 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) {
a0ed51b3 2873 t++;
9f7f3913 2874 cp[2*i+1] = utf8n_to_uvuni(t, tend-t, &ulen, flags);
2b9d42f0 2875 t += ulen;
a0ed51b3 2876 }
2b9d42f0
NIS		 2877 else {
2878 cp[2*i+1] = cp[2*i];
2879 }
2880 i++;
a0ed51b3 2881 }
2b9d42f0 2882 qsort(cp, i, 2*sizeof(UV), uvcompare);
a0ed51b3 2883 for (j = 0; j < i; j++) {
2b9d42f0 2884 UV val = cp[2*j];
a0ed51b3
LW		 2885 diff = val - nextmin;
2886 if (diff > 0) {
9041c2e3 2887 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2888 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3 2889 if (diff > 1) {
2b9d42f0 2890 U8 range_mark = UTF_TO_NATIVE(0xff);
9041c2e3 2891 t = uvuni_to_utf8(tmpbuf, val - 1);
2b9d42f0 2892 sv_catpvn(transv, (char *)&range_mark, 1);
dfe13c55 2893 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
a0ed51b3
LW		 2894 }
2895 }
2b9d42f0 2896 val = cp[2*j+1];
a0ed51b3
LW		 2897 if (val >= nextmin)
2898 nextmin = val + 1;
2899 }
9041c2e3 2900 t = uvuni_to_utf8(tmpbuf,nextmin);
dfe13c55 2901 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
2b9d42f0
NIS		 2902 {
2903 U8 range_mark = UTF_TO_NATIVE(0xff);
2904 sv_catpvn(transv, (char *)&range_mark, 1);
2905 }
b851fbc1
JH		 2906 t = uvuni_to_utf8_flags(tmpbuf, 0x7fffffff,
2907 UNICODE_ALLOW_SUPER);
dfe13c55 2908 sv_catpvn(transv, (char*)tmpbuf, t - tmpbuf);
93524f2b 2909 t = (const U8*)SvPVX_const(transv);
a0ed51b3
LW		 2910 tlen = SvCUR(transv);
2911 tend = t + tlen;
455d824a 2912 Safefree(cp);
a0ed51b3
LW		 2913 }
2914 else if (!rlen && !del) {
2915 r = t; rlen = tlen; rend = tend;
4757a243
LW		 2916 }
2917 if (!squash) {
05d340b8 2918 if ((!rlen && !del) || t == r ||
12ae5dfc 2919 (tlen == rlen && memEQ((char *)t, (char *)r, tlen)))
01ec43d0 2920 {
4757a243 2921 o->op_private |= OPpTRANS_IDENTICAL;
01ec43d0 2922 }
a0ed51b3
LW		 2923 }
2924
2925 while (t < tend || tfirst <= tlast) {
2926 /* see if we need more "t" chars */
2927 if (tfirst > tlast) {
9f7f3913 2928 tfirst = (I32)utf8n_to_uvuni(t, tend - t, &ulen, flags);
a0ed51b3 2929 t += ulen;
2b9d42f0 2930 if (t < tend && NATIVE_TO_UTF(*t) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2931 t++;
9f7f3913 2932 tlast = (I32)utf8n_to_uvuni(t, tend - t, &ulen, flags);
a0ed51b3
LW		 2933 t += ulen;
2934 }
2935 else
2936 tlast = tfirst;
2937 }
2938
2939 /* now see if we need more "r" chars */
2940 if (rfirst > rlast) {
2941 if (r < rend) {
9f7f3913 2942 rfirst = (I32)utf8n_to_uvuni(r, rend - r, &ulen, flags);
a0ed51b3 2943 r += ulen;
2b9d42f0 2944 if (r < rend && NATIVE_TO_UTF(*r) == 0xff) { /* illegal utf8 val indicates range */
ba210ebe 2945 r++;
9f7f3913 2946 rlast = (I32)utf8n_to_uvuni(r, rend - r, &ulen, flags);
a0ed51b3
LW		 2947 r += ulen;
2948 }
2949 else
2950 rlast = rfirst;
2951 }
2952 else {
2953 if (!havefinal++)
2954 final = rlast;
2955 rfirst = rlast = 0xffffffff;
2956 }
2957 }
2958
2959 /* now see which range will peter our first, if either. */
2960 tdiff = tlast - tfirst;
2961 rdiff = rlast - rfirst;
2962
2963 if (tdiff <= rdiff)
2964 diff = tdiff;
2965 else
2966 diff = rdiff;
2967
2968 if (rfirst == 0xffffffff) {
2969 diff = tdiff; /* oops, pretend rdiff is infinite */
2970 if (diff > 0)
894356b3
GS		 2971 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\tXXXX\n",
2972 (long)tfirst, (long)tlast);
a0ed51b3 2973 else
894356b3 2974 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\tXXXX\n", (long)tfirst);
a0ed51b3
LW		 2975 }
2976 else {
2977 if (diff > 0)
894356b3
GS		 2978 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t%04lx\t%04lx\n",
2979 (long)tfirst, (long)(tfirst + diff),
2980 (long)rfirst);
a0ed51b3 2981 else
894356b3
GS		 2982 Perl_sv_catpvf(aTHX_ listsv, "%04lx\t\t%04lx\n",
2983 (long)tfirst, (long)rfirst);
a0ed51b3
LW		 2984
2985 if (rfirst + diff > max)
2986 max = rfirst + diff;
9b877dbb 2987 if (!grows)
45005bfb
JH		 2988 grows = (tfirst < rfirst &&
2989 UNISKIP(tfirst) < UNISKIP(rfirst + diff));
2990 rfirst += diff + 1;
a0ed51b3
LW		 2991 }
2992 tfirst += diff + 1;
2993 }
2994
2995 none = ++max;
2996 if (del)
2997 del = ++max;
2998
2999 if (max > 0xffff)
3000 bits = 32;
3001 else if (max > 0xff)
3002 bits = 16;
3003 else
3004 bits = 8;
3005
455d824a 3006 Safefree(cPVOPo->op_pv);
a0ed51b3
LW		 3007 cSVOPo->op_sv = (SV*)swash_init("utf8", "", listsv, bits, none);
3008 SvREFCNT_dec(listsv);
b37c2d43 3009 SvREFCNT_dec(transv);
a0ed51b3 3010
45005bfb 3011 if (!del && havefinal && rlen)
b448e4fe
JH		 3012 (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5,
3013 newSVuv((UV)final), 0);
a0ed51b3 3014
9b877dbb 3015 if (grows)
a0ed51b3
LW		 3016 o->op_private |= OPpTRANS_GROWS;
3017
b37c2d43
AL		 3018 Safefree(tsave);
3019 Safefree(rsave);
9b877dbb 3020
eb8433b7
NC		 3021#ifdef PERL_MAD
3022 op_getmad(expr,o,'e');
3023 op_getmad(repl,o,'r');
3024#else
a0ed51b3
LW		 3025 op_free(expr);
3026 op_free(repl);
eb8433b7 3027#endif
a0ed51b3
LW		 3028 return o;
3029 }
3030
3031 tbl = (short*)cPVOPo->op_pv;
79072805
LW		 3032 if (complement) {
3033 Zero(tbl, 256, short);
eb160463 3034 for (i = 0; i < (I32)tlen; i++)
ec49126f 3035 tbl[t[i]] = -1;
79072805
LW		 3036 for (i = 0, j = 0; i < 256; i++) {
3037 if (!tbl[i]) {
eb160463 3038 if (j >= (I32)rlen) {
a0ed51b3 3039 if (del)
79072805
LW		 3040 tbl[i] = -2;
3041 else if (rlen)
ec49126f 3042 tbl[i] = r[j-1];
79072805 3043 else
eb160463 3044 tbl[i] = (short)i;
79072805 3045 }
9b877dbb
IH		 3046 else {
3047 if (i < 128 && r[j] >= 128)
3048 grows = 1;
ec49126f 3049 tbl[i] = r[j++];
9b877dbb 3050 }
79072805
LW		 3051 }
3052 }
05d340b8
JH		 3053 if (!del) {
3054 if (!rlen) {
3055 j = rlen;
3056 if (!squash)
3057 o->op_private |= OPpTRANS_IDENTICAL;
3058 }
eb160463 3059 else if (j >= (I32)rlen)
05d340b8
JH		 3060 j = rlen - 1;
3061 else
3062 cPVOPo->op_pv = (char*)Renew(tbl, 0x101+rlen-j, short);
585ec06d 3063 tbl[0x100] = (short)(rlen - j);
eb160463 3064 for (i=0; i < (I32)rlen - j; i++)
8973db79
JH		 3065 tbl[0x101+i] = r[j+i];
3066 }
79072805
LW		 3067 }
3068 else {
a0ed51b3 3069 if (!rlen && !del) {
79072805 3070 r = t; rlen = tlen;
5d06d08e 3071 if (!squash)
4757a243 3072 o->op_private |= OPpTRANS_IDENTICAL;
79072805 3073 }
94bfe852
RGS		 3074 else if (!squash && rlen == tlen && memEQ((char*)t, (char*)r, tlen)) {
3075 o->op_private |= OPpTRANS_IDENTICAL;
3076 }
79072805
LW		 3077 for (i = 0; i < 256; i++)
3078 tbl[i] = -1;
eb160463
GS		 3079 for (i = 0, j = 0; i < (I32)tlen; i++,j++) {
3080 if (j >= (I32)rlen) {
a0ed51b3 3081 if (del) {
ec49126f 3082 if (tbl[t[i]] == -1)
3083 tbl[t[i]] = -2;
79072805
LW		 3084 continue;
3085 }
3086 --j;
3087 }
9b877dbb
IH		 3088 if (tbl[t[i]] == -1) {
3089 if (t[i] < 128 && r[j] >= 128)
3090 grows = 1;
ec49126f 3091 tbl[t[i]] = r[j];
9b877dbb 3092 }
79072805
LW		 3093 }
3094 }
9b877dbb
IH		 3095 if (grows)
3096 o->op_private |= OPpTRANS_GROWS;
eb8433b7
NC		 3097#ifdef PERL_MAD
3098 op_getmad(expr,o,'e');
3099 op_getmad(repl,o,'r');
3100#else
79072805
LW		 3101 op_free(expr);
3102 op_free(repl);
eb8433b7 3103#endif
79072805 3104
11343788 3105 return o;
79072805
LW		 3106}
3107
3108OP *
864dbfa3 3109Perl_newPMOP(pTHX_ I32 type, I32 flags)
79072805 3110{
27da23d5 3111 dVAR;
79072805
LW		 3112 PMOP *pmop;
3113
b7dc083c 3114 NewOp(1101, pmop, 1, PMOP);
eb160463 3115 pmop->op_type = (OPCODE)type;
22c35a8c 3116 pmop->op_ppaddr = PL_ppaddr[type];
eb160463
GS		 3117 pmop->op_flags = (U8)flags;
3118 pmop->op_private = (U8)(0 | (flags >> 8));
79072805 3119
3280af22 3120 if (PL_hints & HINT_RE_TAINT)
b3eb6a9b 3121 pmop->op_pmpermflags |= PMf_RETAINT;
3280af22 3122 if (PL_hints & HINT_LOCALE)
b3eb6a9b
GS		 3123 pmop->op_pmpermflags |= PMf_LOCALE;
3124 pmop->op_pmflags = pmop->op_pmpermflags;
36477c24 3125
debc9467 3126#ifdef USE_ITHREADS
551405c4
AL		 3127 if (av_len((AV*) PL_regex_pad[0]) > -1) {
3128 SV * const repointer = av_pop((AV*)PL_regex_pad[0]);
3129 pmop->op_pmoffset = SvIV(repointer);
3130 SvREPADTMP_off(repointer);
3131 sv_setiv(repointer,0);
3132 } else {
3133 SV * const repointer = newSViv(0);
b37c2d43 3134 av_push(PL_regex_padav, SvREFCNT_inc_simple_NN(repointer));
551405c4
AL		 3135 pmop->op_pmoffset = av_len(PL_regex_padav);
3136 PL_regex_pad = AvARRAY(PL_regex_padav);
13137afc 3137 }
debc9467 3138#endif
1eb1540c 3139
1fcf4c12 3140 /* link into pm list */
3280af22 3141 if (type != OP_TRANS && PL_curstash) {
8d2f4536
NC		 3142 MAGIC *mg = mg_find((SV*)PL_curstash, PERL_MAGIC_symtab);
3143
3144 if (!mg) {
3145 mg = sv_magicext((SV*)PL_curstash, 0, PERL_MAGIC_symtab, 0, 0, 0);
3146 }
3147 pmop->op_pmnext = (PMOP*)mg->mg_obj;
3148 mg->mg_obj = (SV*)pmop;
cb55de95 3149 PmopSTASH_set(pmop,PL_curstash);
79072805
LW		 3150 }
3151
463d09e6 3152 return CHECKOP(type, pmop);
79072805
LW		 3153}
3154
131b3ad0
DM		 3155/* Given some sort of match op o, and an expression expr containing a
3156 * pattern, either compile expr into a regex and attach it to o (if it's
3157 * constant), or convert expr into a runtime regcomp op sequence (if it's
3158 * not)
3159 *
3160 * isreg indicates that the pattern is part of a regex construct, eg
3161 * $x =~ /pattern/ or split /pattern/, as opposed to $x =~ $pattern or
3162 * split "pattern", which aren't. In the former case, expr will be a list
3163 * if the pattern contains more than one term (eg /a$b/) or if it contains
3164 * a replacement, ie s/// or tr///.
3165 */
3166
79072805 3167OP *
131b3ad0 3168Perl_pmruntime(pTHX_ OP *o, OP *expr, bool isreg)
79072805 3169{
27da23d5 3170 dVAR;
79072805
LW		 3171 PMOP *pm;
3172 LOGOP *rcop;
ce862d02 3173 I32 repl_has_vars = 0;
5f66b61c 3174 OP* repl = NULL;
131b3ad0
DM		 3175 bool reglist;
3176
3177 if (o->op_type == OP_SUBST || o->op_type == OP_TRANS) {
3178 /* last element in list is the replacement; pop it */
3179 OP* kid;
3180 repl = cLISTOPx(expr)->op_last;
3181 kid = cLISTOPx(expr)->op_first;
3182 while (kid->op_sibling != repl)
3183 kid = kid->op_sibling;
5f66b61c 3184 kid->op_sibling = NULL;
131b3ad0
DM		 3185 cLISTOPx(expr)->op_last = kid;
3186 }
79072805 3187
131b3ad0
DM		 3188 if (isreg && expr->op_type == OP_LIST &&
3189 cLISTOPx(expr)->op_first->op_sibling == cLISTOPx(expr)->op_last)
3190 {
3191 /* convert single element list to element */
0bd48802 3192 OP* const oe = expr;
131b3ad0 3193 expr = cLISTOPx(oe)->op_first->op_sibling;
5f66b61c
AL		 3194 cLISTOPx(oe)->op_first->op_sibling = NULL;
3195 cLISTOPx(oe)->op_last = NULL;
131b3ad0
DM		 3196 op_free(oe);
3197 }
3198
3199 if (o->op_type == OP_TRANS) {
11343788 3200 return pmtrans(o, expr, repl);
131b3ad0
DM		 3201 }
3202
3203 reglist = isreg && expr->op_type == OP_LIST;
3204 if (reglist)
3205 op_null(expr);
79072805 3206
3280af22 3207 PL_hints |= HINT_BLOCK_SCOPE;
11343788 3208 pm = (PMOP*)o;
79072805
LW		 3209
3210 if (expr->op_type == OP_CONST) {
463ee0b2 3211 STRLEN plen;
6136c704 3212 SV * const pat = ((SVOP*)expr)->op_sv;
5c144d81 3213 const char *p = SvPV_const(pat, plen);
770526c1 3214 if ((o->op_flags & OPf_SPECIAL) && (*p == ' ' && p[1] == '\0')) {
5c144d81
NC		 3215 U32 was_readonly = SvREADONLY(pat);
3216
3217 if (was_readonly) {
3218 if (SvFAKE(pat)) {
3219 sv_force_normal_flags(pat, 0);
3220 assert(!SvREADONLY(pat));
3221 was_readonly = 0;
3222 } else {
3223 SvREADONLY_off(pat);
3224 }
3225 }
3226
93a17b20 3227 sv_setpvn(pat, "\\s+", 3);
5c144d81
NC		 3228
3229 SvFLAGS(pat) |= was_readonly;
3230
3231 p = SvPV_const(pat, plen);
79072805
LW		 3232 pm->op_pmflags |= PMf_SKIPWHITE;
3233 }
5b71a6a7 3234 if (DO_UTF8(pat))
a5961de5 3235 pm->op_pmdynflags |= PMdf_UTF8;
5c144d81
NC		 3236 /* FIXME - can we make this function take const char * args? */
3237 PM_SETRE(pm, CALLREGCOMP(aTHX_ (char*)p, (char*)p + plen, pm));
aaa362c4 3238 if (strEQ("\\s+", PM_GETRE(pm)->precomp))
85e6fe83 3239 pm->op_pmflags |= PMf_WHITE;
eb8433b7
NC		 3240#ifdef PERL_MAD
3241 op_getmad(expr,(OP*)pm,'e');
3242#else
79072805 3243 op_free(expr);
eb8433b7 3244#endif
79072805
LW		 3245 }
3246 else {
3280af22 3247 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL))
1c846c1f 3248 expr = newUNOP((!(PL_hints & HINT_RE_EVAL)
2cd61cdb
IZ		 3249 ? OP_REGCRESET
3250 : OP_REGCMAYBE),0,expr);
463ee0b2 3251
b7dc083c 3252 NewOp(1101, rcop, 1, LOGOP);
79072805 3253 rcop->op_type = OP_REGCOMP;
22c35a8c 3254 rcop->op_ppaddr = PL_ppaddr[OP_REGCOMP];
79072805 3255 rcop->op_first = scalar(expr);
131b3ad0
DM		 3256 rcop->op_flags |= OPf_KIDS
3257 | ((PL_hints & HINT_RE_EVAL) ? OPf_SPECIAL : 0)
3258 | (reglist ? OPf_STACKED : 0);
79072805 3259 rcop->op_private = 1;
11343788 3260 rcop->op_other = o;
131b3ad0
DM		 3261 if (reglist)
3262 rcop->op_targ = pad_alloc(rcop->op_type, SVs_PADTMP);
3263
b5c19bd7
DM		 3264 /* /$x/ may cause an eval, since $x might be qr/(?{..})/ */
3265 PL_cv_has_eval = 1;
79072805
LW		 3266
3267 /* establish postfix order */
3280af22 3268 if (pm->op_pmflags & PMf_KEEP || !(PL_hints & HINT_RE_EVAL)) {
463ee0b2
LW		 3269 LINKLIST(expr);
3270 rcop->op_next = expr;
3271 ((UNOP*)expr)->op_first->op_next = (OP*)rcop;
3272 }
3273 else {
3274 rcop->op_next = LINKLIST(expr);
3275 expr->op_next = (OP*)rcop;
3276 }
79072805 3277
11343788 3278 prepend_elem(o->op_type, scalar((OP*)rcop), o);
79072805
LW		 3279 }
3280
3281 if (repl) {
748a9306 3282 OP *curop;
0244c3a4 3283 if (pm->op_pmflags & PMf_EVAL) {
6136c704 3284 curop = NULL;
8bafa735 3285 if (CopLINE(PL_curcop) < (line_t)PL_multi_end)
eb160463 3286 CopLINE_set(PL_curcop, (line_t)PL_multi_end);
0244c3a4 3287 }
748a9306
LW		 3288 else if (repl->op_type == OP_CONST)
3289 curop = repl;
79072805 3290 else {
c445ea15 3291 OP *lastop = NULL;
79072805 3292 for (curop = LINKLIST(repl); curop!=repl; curop = LINKLIST(curop)) {
22c35a8c 3293 if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
79072805 3294 if (curop->op_type == OP_GV) {
6136c704 3295 GV * const gv = cGVOPx_gv(curop);
ce862d02 3296 repl_has_vars = 1;
f702bf4a 3297 if (strchr("&`'123456789+-\016\022", *GvENAME(gv)))
79072805
LW		 3298 break;
3299 }
3300 else if (curop->op_type == OP_RV2CV)
3301 break;
3302 else if (curop->op_type == OP_RV2SV ||
3303 curop->op_type == OP_RV2AV ||
3304 curop->op_type == OP_RV2HV ||
3305 curop->op_type == OP_RV2GV) {
3306 if (lastop && lastop->op_type != OP_GV) /*funny deref?*/
3307 break;
3308 }
748a9306
LW		 3309 else if (curop->op_type == OP_PADSV ||
3310 curop->op_type == OP_PADAV ||
3311 curop->op_type == OP_PADHV ||
554b3eca 3312 curop->op_type == OP_PADANY) {
ce862d02 3313 repl_has_vars = 1;
748a9306 3314 }
1167e5da 3315 else if (curop->op_type == OP_PUSHRE)
bb263b4e 3316 /*EMPTY*/; /* Okay here, dangerous in newASSIGNOP */
79072805
LW		 3317 else
3318 break;
3319 }
3320 lastop = curop;
3321 }
748a9306 3322 }
ce862d02 3323 if (curop == repl
1c846c1f 3324 && !(repl_has_vars
aaa362c4
RS		 3325 && (!PM_GETRE(pm)
3326 || PM_GETRE(pm)->reganch & ROPT_EVAL_SEEN))) {
748a9306 3327 pm->op_pmflags |= PMf_CONST; /* const for long enough */
4633a7c4 3328 pm->op_pmpermflags |= PMf_CONST; /* const for long enough */
11343788 3329 prepend_elem(o->op_type, scalar(repl), o);
748a9306
LW		 3330 }
3331 else {
aaa362c4 3332 if (curop == repl && !PM_GETRE(pm)) { /* Has variables. */
ce862d02
IZ		 3333 pm->op_pmflags |= PMf_MAYBE_CONST;
3334 pm->op_pmpermflags |= PMf_MAYBE_CONST;
3335 }
b7dc083c 3336 NewOp(1101, rcop, 1, LOGOP);
748a9306 3337 rcop->op_type = OP_SUBSTCONT;
22c35a8c 3338 rcop->op_ppaddr = PL_ppaddr[OP_SUBSTCONT];
748a9306
LW		 3339 rcop->op_first = scalar(repl);
3340 rcop->op_flags |= OPf_KIDS;
3341 rcop->op_private = 1;
11343788 3342 rcop->op_other = o;
748a9306
LW		 3343
3344 /* establish postfix order */
3345 rcop->op_next = LINKLIST(repl);
3346 repl->op_next = (OP*)rcop;
3347
3348 pm->op_pmreplroot = scalar((OP*)rcop);
3349 pm->op_pmreplstart = LINKLIST(rcop);
3350 rcop->op_next = 0;
79072805
LW		 3351 }
3352 }
3353
3354 return (OP*)pm;
3355}
3356
3357OP *
864dbfa3 3358Perl_newSVOP(pTHX_ I32 type, I32 flags, SV *sv)
79072805 3359{
27da23d5 3360 dVAR;
79072805 3361 SVOP *svop;
b7dc083c 3362 NewOp(1101, svop, 1, SVOP);
eb160463 3363 svop->op_type = (OPCODE)type;
22c35a8c 3364 svop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3365 svop->op_sv = sv;
3366 svop->op_next = (OP*)svop;
eb160463 3367 svop->op_flags = (U8)flags;
22c35a8c 3368 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 3369 scalar((OP*)svop);
22c35a8c 3370 if (PL_opargs[type] & OA_TARGET)
ed6116ce 3371 svop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 3372 return CHECKOP(type, svop);
79072805
LW		 3373}
3374
3375OP *
350de78d
GS		 3376Perl_newPADOP(pTHX_ I32 type, I32 flags, SV *sv)
3377{
27da23d5 3378 dVAR;
350de78d
GS		 3379 PADOP *padop;
3380 NewOp(1101, padop, 1, PADOP);
eb160463 3381 padop->op_type = (OPCODE)type;
350de78d
GS		 3382 padop->op_ppaddr = PL_ppaddr[type];
3383 padop->op_padix = pad_alloc(type, SVs_PADTMP);
dd2155a4
DM		 3384 SvREFCNT_dec(PAD_SVl(padop->op_padix));
3385 PAD_SETSV(padop->op_padix, sv);
ce50c033
AMS		 3386 if (sv)
3387 SvPADTMP_on(sv);
350de78d 3388 padop->op_next = (OP*)padop;
eb160463 3389 padop->op_flags = (U8)flags;
350de78d
GS		 3390 if (PL_opargs[type] & OA_RETSCALAR)
3391 scalar((OP*)padop);
3392 if (PL_opargs[type] & OA_TARGET)
3393 padop->op_targ = pad_alloc(type, SVs_PADTMP);
3394 return CHECKOP(type, padop);
3395}
3396
3397OP *
864dbfa3 3398Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
79072805 3399{
27da23d5 3400 dVAR;
350de78d 3401#ifdef USE_ITHREADS
ce50c033
AMS		 3402 if (gv)
3403 GvIN_PAD_on(gv);
b37c2d43 3404 return newPADOP(type, flags, SvREFCNT_inc_simple(gv));
350de78d 3405#else
b37c2d43 3406 return newSVOP(type, flags, SvREFCNT_inc_simple(gv));
350de78d 3407#endif
79072805
LW		 3408}
3409
3410OP *
864dbfa3 3411Perl_newPVOP(pTHX_ I32 type, I32 flags, char *pv)
79072805 3412{
27da23d5 3413 dVAR;
79072805 3414 PVOP *pvop;
b7dc083c 3415 NewOp(1101, pvop, 1, PVOP);
eb160463 3416 pvop->op_type = (OPCODE)type;
22c35a8c 3417 pvop->op_ppaddr = PL_ppaddr[type];
79072805
LW		 3418 pvop->op_pv = pv;
3419 pvop->op_next = (OP*)pvop;
eb160463 3420 pvop->op_flags = (U8)flags;
22c35a8c 3421 if (PL_opargs[type] & OA_RETSCALAR)
463ee0b2 3422 scalar((OP*)pvop);
22c35a8c 3423 if (PL_opargs[type] & OA_TARGET)
ed6116ce 3424 pvop->op_targ = pad_alloc(type, SVs_PADTMP);
e50aee73 3425 return CHECKOP(type, pvop);
79072805
LW		 3426}
3427
eb8433b7
NC		 3428#ifdef PERL_MAD
3429OP*
3430#else
79072805 3431void
eb8433b7 3432#endif
864dbfa3 3433Perl_package(pTHX_ OP *o)
79072805 3434{
97aff369 3435 dVAR;
6867be6d 3436 const char *name;
de11ba31 3437 STRLEN len;
eb8433b7
NC		 3438#ifdef PERL_MAD
3439 OP *pegop;
3440#endif
79072805 3441
3280af22
NIS		 3442 save_hptr(&PL_curstash);
3443 save_item(PL_curstname);
de11ba31 3444
5c144d81 3445 name = SvPV_const(cSVOPo->op_sv, len);
de11ba31
AMS		 3446 PL_curstash = gv_stashpvn(name, len, TRUE);
3447 sv_setpvn(PL_curstname, name, len);
de11ba31 3448
7ad382f4 3449 PL_hints |= HINT_BLOCK_SCOPE;
3280af22
NIS		 3450 PL_copline = NOLINE;
3451 PL_expect = XSTATE;
eb8433b7
NC		 3452
3453#ifndef PERL_MAD
3454 op_free(o);
3455#else
3456 if (!PL_madskills) {
3457 op_free(o);
1d866c12 3458 return NULL;
eb8433b7
NC		 3459 }
3460
3461 pegop = newOP(OP_NULL,0);
3462 op_getmad(o,pegop,'P');
3463 return pegop;
3464#endif
79072805
LW		 3465}
3466
eb8433b7
NC		 3467#ifdef PERL_MAD
3468OP*
3469#else
85e6fe83 3470void
eb8433b7 3471#endif
88d95a4d 3472Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *idop, OP *arg)
85e6fe83 3473{
97aff369 3474 dVAR;
a0d0e21e 3475 OP *pack;
a0d0e21e 3476 OP *imop;
b1cb66bf 3477 OP *veop;
eb8433b7
NC		 3478#ifdef PERL_MAD
3479 OP *pegop = newOP(OP_NULL,0);
3480#endif
85e6fe83 3481
88d95a4d 3482 if (idop->op_type != OP_CONST)
cea2e8a9 3483 Perl_croak(aTHX_ "Module name must be constant");
85e6fe83 3484
eb8433b7
NC		 3485 if (PL_madskills)
3486 op_getmad(idop,pegop,'U');
3487
5f66b61c 3488 veop = NULL;
b1cb66bf 3489
aec46f14 3490 if (version) {
551405c4 3491 SV * const vesv = ((SVOP*)version)->op_sv;
b1cb66bf 3492
eb8433b7
NC		 3493 if (PL_madskills)
3494 op_getmad(version,pegop,'V');
aec46f14 3495 if (!arg && !SvNIOKp(vesv)) {
b1cb66bf 3496 arg = version;
3497 }
3498 else {
3499 OP *pack;
0f79a09d 3500 SV *meth;
b1cb66bf 3501
44dcb63b 3502 if (version->op_type != OP_CONST || !SvNIOKp(vesv))
cea2e8a9 3503 Perl_croak(aTHX_ "Version number must be constant number");
b1cb66bf 3504
88d95a4d
JH		 3505 /* Make copy of idop so we don't free it twice */
3506 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
b1cb66bf 3507
3508 /* Fake up a method call to VERSION */
18916d0d 3509 meth = newSVpvs_share("VERSION");
b1cb66bf 3510 veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
3511 append_elem(OP_LIST,
0f79a09d
GS		 3512 prepend_elem(OP_LIST, pack, list(version)),
3513 newSVOP(OP_METHOD_NAMED, 0, meth)));
b1cb66bf 3514 }
3515 }
aeea060c 3516
a0d0e21e 3517 /* Fake up an import/unimport */
eb8433b7
NC		 3518 if (arg && arg->op_type == OP_STUB) {
3519 if (PL_madskills)
3520 op_getmad(arg,pegop,'S');
4633a7c4 3521 imop = arg; /* no import on explicit () */
eb8433b7 3522 }
88d95a4d 3523 else if (SvNIOKp(((SVOP*)idop)->op_sv)) {
5f66b61c 3524 imop = NULL; /* use 5.0; */
468aa647
RGS		 3525 if (!aver)
3526 idop->op_private |= OPpCONST_NOVER;
b1cb66bf 3527 }
4633a7c4 3528 else {
0f79a09d
GS		 3529 SV *meth;
3530
eb8433b7
NC		 3531 if (PL_madskills)
3532 op_getmad(arg,pegop,'A');
3533
88d95a4d
JH		 3534 /* Make copy of idop so we don't free it twice */
3535 pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)idop)->op_sv));
0f79a09d
GS		 3536
3537 /* Fake up a method call to import/unimport */
427d62a4 3538 meth = aver
18916d0d 3539 ? newSVpvs_share("import") : newSVpvs_share("unimport");
4633a7c4 3540 imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
0f79a09d
GS		 3541 append_elem(OP_LIST,
3542 prepend_elem(OP_LIST, pack, list(arg)),
3543 newSVOP(OP_METHOD_NAMED, 0, meth)));
4633a7c4
LW		 3544 }