3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
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.
12 #undef sv_flags /* Convex has this in <signal.h> for sigvec() */
18 =for apidoc AmU||svtype
19 An enum of flags for Perl types. These are found in the file B<sv.h>
20 in the C<svtype> enum. Test these flags with the C<SvTYPE> macro.
42 These are most easily explained from the bottom up.
44 SVt_PVIO is for I/O objects, SVt_PVFM for formats, SVt_PVCV for
45 subroutines, SVt_PVHV for hashes and SVt_PVAV for arrays.
47 All the others are scalar types, that is, things that can be bound to a
48 C<$> variable. For these, the internal types are mostly orthogonal to
49 types in the Perl language.
51 Hence, checking C<< SvTYPE(sv) < SVt_PVAV >> is the best way to see whether
52 something is a scalar.
54 SVt_PVGV represents a typeglob. If !SvFAKE(sv), then it is a real,
55 incoercible typeglob. If SvFAKE(sv), then it is a scalar to which a
56 typeglob has been assigned. Assigning to it again will stop it from being
57 a typeglob. SVt_PVLV represents a scalar that delegates to another scalar
58 behind the scenes. It is used, e.g., for the return value of C<substr> and
59 for tied hash and array elements. It can hold any scalar value, including
60 a typeglob. SVt_REGEXP is for regular
61 expressions. SVt_INVLIST is for Perl
62 core internal use only.
64 SVt_PVMG represents a "normal" scalar (not a typeglob, regular expression,
65 or delegate). Since most scalars do not need all the internal fields of a
66 PVMG, we save memory by allocating smaller structs when possible. All the
67 other types are just simpler forms of SVt_PVMG, with fewer internal fields.
68 SVt_NULL can only hold undef. SVt_IV can hold undef, an integer, or a
69 reference. (SVt_RV is an alias for SVt_IV, which exists for backward
70 compatibility.) SVt_NV can hold any of those or a double. SVt_PV can only
71 hold undef or a string. SVt_PVIV is a superset of SVt_PV and SVt_IV.
72 SVt_PVNV is similar. SVt_PVMG can hold anything SVt_PVNV can hold, but it
73 can, but does not have to, be blessed or magical.
75 =for apidoc AmU||SVt_NULL
76 Type flag for scalars. See L</svtype>.
78 =for apidoc AmU||SVt_IV
79 Type flag for scalars. See L</svtype>.
81 =for apidoc AmU||SVt_NV
82 Type flag for scalars. See L</svtype>.
84 =for apidoc AmU||SVt_PV
85 Type flag for scalars. See L</svtype>.
87 =for apidoc AmU||SVt_PVIV
88 Type flag for scalars. See L</svtype>.
90 =for apidoc AmU||SVt_PVNV
91 Type flag for scalars. See L</svtype>.
93 =for apidoc AmU||SVt_PVMG
94 Type flag for scalars. See L</svtype>.
96 =for apidoc AmU||SVt_INVLIST
97 Type flag for scalars. See L</svtype>.
99 =for apidoc AmU||SVt_REGEXP
100 Type flag for regular expressions. See L</svtype>.
102 =for apidoc AmU||SVt_PVGV
103 Type flag for typeglobs. See L</svtype>.
105 =for apidoc AmU||SVt_PVLV
106 Type flag for scalars. See L</svtype>.
108 =for apidoc AmU||SVt_PVAV
109 Type flag for arrays. See L</svtype>.
111 =for apidoc AmU||SVt_PVHV
112 Type flag for hashes. See L</svtype>.
114 =for apidoc AmU||SVt_PVCV
115 Type flag for subroutines. See L</svtype>.
117 =for apidoc AmU||SVt_PVFM
118 Type flag for formats. See L</svtype>.
120 =for apidoc AmU||SVt_PVIO
121 Type flag for I/O objects. See L</svtype>.
125 These are ordered so that the simpler types have a lower value; SvUPGRADE
126 doesn't allow you to upgrade from a higher numbered type to a lower numbered
127 one; also there is code that assumes that anything that has as a PV component
128 has a type numbered >= SVt_PV.
134 /* BIND was here, before INVLIST replaced it. */
137 /* RV was here, before it was merged with IV. */
139 SVt_INVLIST, /* 4, implemented as a PV */
144 /* PVBM was here, before BIND replaced it. */
152 SVt_LAST /* keep last in enum. used to size arrays */
155 /* *** any alterations to the SV types above need to be reflected in
156 * SVt_MASK and the various PL_valid_types_* tables. As of this writing those
157 * tables are in perl.h. There are also two affected names tables in dump.c,
158 * one in B.xs, and 'bodies_by_type[]' in sv.c */
160 #define SVt_MASK 0xf /* smallest bitmask that covers all types */
163 /* Although Fast Boyer Moore tables are now being stored in PVGVs, for most
164 purposes external code wanting to consider PVBM probably needs to think of
166 # define SVt_PVBM SVt_PVMG
167 /* Anything wanting to create a reference from clean should ensure that it has
168 a scalar of type SVt_IV now: */
169 # define SVt_RV SVt_IV
172 /* There is collusion here with sv_clear - sv_clear exits early for SVt_NULL
173 so never reaches the clause at the end that uses sv_type_details->body_size
174 to determine whether to call safefree(). Hence body_size can be set
175 non-zero to record the size of HEs, without fear of bogus frees. */
176 #if defined(PERL_IN_HV_C) || defined(PERL_IN_XS_APITEST)
177 #define HE_SVSLOT SVt_NULL
180 # define SVt_FIRST SVt_NULL /* the type of SV that new_SV() in sv.c returns */
183 #define PERL_ARENA_ROOTS_SIZE (SVt_LAST)
185 /* typedefs to eliminate some typing */
186 typedef struct he HE;
187 typedef struct hek HEK;
189 /* Using C's structural equivalence to help emulate C++ inheritance here... */
191 /* start with 2 sv-head building blocks */
192 #define _SV_HEAD(ptrtype) \
193 ptrtype sv_any; /* pointer to body */ \
194 U32 sv_refcnt; /* how many references to us */ \
195 U32 sv_flags /* what we are */
198 # define _NV_BODYLESS_UNION NV svu_nv;
200 # define _NV_BODYLESS_UNION
203 #define _SV_HEAD_UNION \
205 char* svu_pv; /* pointer to malloced string */ \
209 SV* svu_rv; /* pointer to another SV */ \
210 struct regexp* svu_rx; \
218 struct STRUCT_SV { /* struct sv { */
221 #ifdef DEBUG_LEAKING_SCALARS
222 PERL_BITFIELD32 sv_debug_optype:9; /* the type of OP that allocated us */
223 PERL_BITFIELD32 sv_debug_inpad:1; /* was allocated in a pad for an OP */
224 PERL_BITFIELD32 sv_debug_line:16; /* the line where we were allocated */
225 UV sv_debug_serial; /* serial number of sv allocation */
226 char * sv_debug_file; /* the file where we were allocated */
227 SV * sv_debug_parent; /* what we were cloned from (ithreads)*/
232 _SV_HEAD(XPVGV*); /* pointer to xpvgv body */
237 _SV_HEAD(XPVCV*); /* pointer to xpvcv body */
242 _SV_HEAD(XPVAV*); /* pointer to xpvav body */
247 _SV_HEAD(XPVHV*); /* pointer to xpvhv body */
252 _SV_HEAD(XPVIO*); /* pointer to xpvio body */
257 _SV_HEAD(struct regexp*); /* pointer to regexp body */
262 #undef _SV_HEAD_UNION /* ensure no pollution */
265 =head1 SV Manipulation Functions
267 =for apidoc Am|U32|SvREFCNT|SV* sv
268 Returns the value of the object's reference count.
270 =for apidoc Am|SV*|SvREFCNT_inc|SV* sv
271 Increments the reference count of the given SV, returning the SV.
273 All of the following SvREFCNT_inc* macros are optimized versions of
274 SvREFCNT_inc, and can be replaced with SvREFCNT_inc.
276 =for apidoc Am|SV*|SvREFCNT_inc_NN|SV* sv
277 Same as SvREFCNT_inc, but can only be used if you know I<sv>
278 is not NULL. Since we don't have to check the NULLness, it's faster
281 =for apidoc Am|void|SvREFCNT_inc_void|SV* sv
282 Same as SvREFCNT_inc, but can only be used if you don't need the
283 return value. The macro doesn't need to return a meaningful value.
285 =for apidoc Am|void|SvREFCNT_inc_void_NN|SV* sv
286 Same as SvREFCNT_inc, but can only be used if you don't need the return
287 value, and you know that I<sv> is not NULL. The macro doesn't need
288 to return a meaningful value, or check for NULLness, so it's smaller
291 =for apidoc Am|SV*|SvREFCNT_inc_simple|SV* sv
292 Same as SvREFCNT_inc, but can only be used with expressions without side
293 effects. Since we don't have to store a temporary value, it's faster.
295 =for apidoc Am|SV*|SvREFCNT_inc_simple_NN|SV* sv
296 Same as SvREFCNT_inc_simple, but can only be used if you know I<sv>
297 is not NULL. Since we don't have to check the NULLness, it's faster
300 =for apidoc Am|void|SvREFCNT_inc_simple_void|SV* sv
301 Same as SvREFCNT_inc_simple, but can only be used if you don't need the
302 return value. The macro doesn't need to return a meaningful value.
304 =for apidoc Am|void|SvREFCNT_inc_simple_void_NN|SV* sv
305 Same as SvREFCNT_inc, but can only be used if you don't need the return
306 value, and you know that I<sv> is not NULL. The macro doesn't need
307 to return a meaningful value, or check for NULLness, so it's smaller
310 =for apidoc Am|void|SvREFCNT_dec|SV* sv
311 Decrements the reference count of the given SV. I<sv> may be NULL.
313 =for apidoc Am|void|SvREFCNT_dec_NN|SV* sv
314 Same as SvREFCNT_dec, but can only be used if you know I<sv>
315 is not NULL. Since we don't have to check the NULLness, it's faster
318 =for apidoc Am|svtype|SvTYPE|SV* sv
319 Returns the type of the SV. See C<svtype>.
321 =for apidoc Am|void|SvUPGRADE|SV* sv|svtype type
322 Used to upgrade an SV to a more complex form. Uses C<sv_upgrade> to
323 perform the upgrade if necessary. See C<svtype>.
328 #define SvANY(sv) (sv)->sv_any
329 #define SvFLAGS(sv) (sv)->sv_flags
330 #define SvREFCNT(sv) (sv)->sv_refcnt
332 #define SvREFCNT_inc(sv) S_SvREFCNT_inc(MUTABLE_SV(sv))
333 #define SvREFCNT_inc_simple(sv) SvREFCNT_inc(sv)
334 #define SvREFCNT_inc_NN(sv) S_SvREFCNT_inc_NN(MUTABLE_SV(sv))
335 #define SvREFCNT_inc_void(sv) S_SvREFCNT_inc_void(MUTABLE_SV(sv))
337 /* These guys don't need the curly blocks */
338 #define SvREFCNT_inc_simple_void(sv) STMT_START { if (sv) SvREFCNT(sv)++; } STMT_END
339 #define SvREFCNT_inc_simple_NN(sv) (++(SvREFCNT(sv)),MUTABLE_SV(sv))
340 #define SvREFCNT_inc_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
341 #define SvREFCNT_inc_simple_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
343 #define SvREFCNT_dec(sv) S_SvREFCNT_dec(aTHX_ MUTABLE_SV(sv))
344 #define SvREFCNT_dec_NN(sv) S_SvREFCNT_dec_NN(aTHX_ MUTABLE_SV(sv))
346 #define SVTYPEMASK 0xff
347 #define SvTYPE(sv) ((svtype)((sv)->sv_flags & SVTYPEMASK))
349 /* Sadly there are some parts of the core that have pointers to already-freed
350 SV heads, and rely on being able to tell that they are now free. So mark
351 them all by using a consistent macro. */
352 #define SvIS_FREED(sv) UNLIKELY(((sv)->sv_flags == SVTYPEMASK))
354 /* this is defined in this peculiar way to avoid compiler warnings.
355 * See the <20121213131428.GD1842@iabyn.com> thread in p5p */
356 #define SvUPGRADE(sv, mt) \
357 ((void)(SvTYPE(sv) >= (mt) || (sv_upgrade(sv, mt),1)))
359 #define SVf_IOK 0x00000100 /* has valid public integer value */
360 #define SVf_NOK 0x00000200 /* has valid public numeric value */
361 #define SVf_POK 0x00000400 /* has valid public pointer value */
362 #define SVf_ROK 0x00000800 /* has a valid reference pointer */
364 #define SVp_IOK 0x00001000 /* has valid non-public integer value */
365 #define SVp_NOK 0x00002000 /* has valid non-public numeric value */
366 #define SVp_POK 0x00004000 /* has valid non-public pointer value */
367 #define SVp_SCREAM 0x00008000 /* method name is DOES */
368 #define SVphv_CLONEABLE SVp_SCREAM /* PVHV (stashes) clone its objects */
369 #define SVpgv_GP SVp_SCREAM /* GV has a valid GP */
370 #define SVprv_PCS_IMPORTED SVp_SCREAM /* RV is a proxy for a constant
371 subroutine in another package. Set the
372 GvIMPORTED_CV_on() if it needs to be
373 expanded to a real GV */
374 #define SVf_PROTECT 0x00010000 /* very read-only */
375 #define SVs_PADTMP 0x00020000 /* in use as tmp */
376 #define SVs_PADSTALE 0x00040000 /* lexical has gone out of scope;
377 only used when !PADTMP */
378 #define SVs_TEMP 0x00080000 /* mortal (implies string is stealable) */
379 #define SVs_OBJECT 0x00100000 /* is "blessed" */
380 #define SVs_GMG 0x00200000 /* has magical get method */
381 #define SVs_SMG 0x00400000 /* has magical set method */
382 #define SVs_RMG 0x00800000 /* has random magical methods */
384 #define SVf_FAKE 0x01000000 /* 0: glob is just a copy
385 1: SV head arena wasn't malloc()ed
386 2: For PVCV, whether CvUNIQUE(cv)
387 refers to an eval or once only
388 [CvEVAL(cv), CvSPECIAL(cv)]
389 3: HV: informally reserved by DAPM
391 #define SVf_OOK 0x02000000 /* has valid offset value. For a PVHV this
392 means that a hv_aux struct is present
393 after the main array */
394 #define SVf_BREAK 0x04000000 /* refcnt is artificially low - used by
395 SVs in final arena cleanup.
396 Set in S_regtry on PL_reg_curpm, so that
397 perl_destruct will skip it. */
398 #define SVf_READONLY 0x08000000 /* may not be modified */
403 #define SVf_THINKFIRST (SVf_READONLY|SVf_PROTECT|SVf_ROK|SVf_FAKE \
406 #define SVf_OK (SVf_IOK|SVf_NOK|SVf_POK|SVf_ROK| \
407 SVp_IOK|SVp_NOK|SVp_POK|SVpgv_GP)
409 #define PRIVSHIFT 4 /* (SVp_?OK >> PRIVSHIFT) == SVf_?OK */
411 /* Note that SVf_AMAGIC is now only set on stashes. */
412 #define SVf_AMAGIC 0x10000000 /* has magical overloaded methods */
413 #define SVf_IsCOW 0x10000000 /* copy on write (shared hash key if
416 /* Ensure this value does not clash with the GV_ADD* flags in gv.h, or the
417 CV_CKPROTO_* flags in op.c, or the padadd_* flags in pad.h: */
418 #define SVf_UTF8 0x20000000 /* SvPV is UTF-8 encoded
419 This is also set on RVs whose overloaded
420 stringification is UTF-8. This might
421 only happen as a side effect of SvPV() */
423 #define SVphv_SHAREKEYS 0x20000000 /* PVHV keys live on shared string table */
425 /* PVAV could probably use 0x2000000 without conflict. I assume that PVFM can
426 be UTF-8 encoded, and PVCVs could well have UTF-8 prototypes. PVIOs haven't
427 been restructured, so sometimes get used as string buffers. */
430 /* Some private flags. */
433 /* The SVp_SCREAM|SVpbm_VALID (0x40008000) combination is up for grabs.
434 Formerly it was used for pad names, but now it is available. The core
435 is careful to avoid setting both flags.
437 SVf_POK, SVp_POK also set:
439 0x0000C400 method name for DOES (SvSCREAM)
440 0x40004400 FBM compiled (SvVALID)
441 0x4000C400 *** Formerly used for pad names ***
443 0x00008000 GV with GP
444 0x00008800 RV with PCS imported
447 #define SVpav_REAL 0x40000000 /* free old entries */
449 #define SVphv_LAZYDEL 0x40000000 /* entry in xhv_eiter must be deleted */
450 /* This is only set true on a PVGV when it's playing "PVBM", but is tested for
451 on any regular scalar (anything <= PVLV) */
452 #define SVpbm_VALID 0x40000000
453 /* Only used in toke.c on an SV stored in PL_lex_repl */
454 #define SVrepl_EVAL 0x40000000 /* Replacement part of s///e */
456 /* IV, PVIV, PVNV, PVMG, PVGV and (I assume) PVLV */
457 #define SVf_IVisUV 0x80000000 /* use XPVUV instead of XPVIV */
459 #define SVpav_REIFY 0x80000000 /* can become real */
461 #define SVphv_HASKFLAGS 0x80000000 /* keys have flag byte after hash */
462 /* PVGV when SVpbm_VALID is true */
463 #define SVpbm_TAIL 0x80000000
464 /* RV upwards. However, SVf_ROK and SVp_IOK are exclusive */
465 #define SVprv_WEAKREF 0x80000000 /* Weak reference */
466 /* pad name vars only */
469 HV* xmg_stash; /* class package */ \
471 STRLEN xpv_cur; /* length of svu_pv as a C string */ \
473 STRLEN xpvlenu_len; /* allocated size */ \
474 char * xpvlenu_pv; /* regexp string */ \
477 #define xpv_len xpv_len_u.xpvlenu_len
480 NV xnv_nv; /* numeric value, if any */
485 } xpad_cop_seq; /* used by pad.c for cop_sequence */
489 IV xivu_iv; /* integer value */
491 HEK * xivu_namehek; /* xpvlv, xpvgv: GvNAME */
495 MAGIC* xmg_magic; /* linked list of magicalness */
496 STRLEN xmg_hash_index; /* used while freeing hash entries */
508 #define xiv_iv xiv_u.xivu_iv
515 #define xuv_uv xuv_u.xivu_uv
523 /* This structure must match the beginning of struct xpvhv in hv.h. */
536 SSize_t xlvu_stargoff;
540 char xlv_type; /* k=keys .=pos x=substr v=vec /=join/re
541 * y=alem/helem/iter t=tie T=tied HE */
542 char xlv_flags; /* 1 = negative offset 2 = negative len */
545 #define xlv_targoff xlv_targoff_u.xlvu_targoff
549 IV prev_index; /* caches result of previous invlist_search() */
550 STRLEN iterator; /* Stores where we are in iterating */
551 bool is_offset; /* The data structure for all inversion lists
552 begins with an element for code point U+0000.
553 If this bool is set, the actual list contains
554 that 0; otherwise, the list actually begins
555 with the following element. Thus to invert
556 the list, merely toggle this flag */
559 /* This structure works in 3 ways - regular scalar, GV with GP, or fast
567 typedef U32 cv_flags_t;
569 #define _XPVCV_COMMON \
577 void (*xcv_xsub) (pTHX_ CV*); \
585 PADLIST * xcv_padlist; \
589 U32 xcv_outside_seq; /* the COP sequence (at the point of our \
590 * compilation) in the lexically enclosing \
592 cv_flags_t xcv_flags; \
593 I32 xcv_depth /* >= 2 indicates recursive call */
595 /* This structure must match XPVCV in cv.h */
606 /* ifp and ofp are normally the same, but sockets need separate streams */
608 /* Cray addresses everything by word boundaries (64 bits) and
609 * code and data pointers cannot be mixed (which is exactly what
610 * Perl_filter_add() tries to do with the dirp), hence the
611 * following union trick (as suggested by Gurusamy Sarathy).
612 * For further information see Geir Johansen's problem report
613 * titled [ID 20000612.002] Perl problem on Cray system
614 * The any pointer (known as IoANY()) will also be a good place
615 * to hang any IO disciplines to.
618 DIR * xiou_dirp; /* for opendir, readdir, etc */
619 void * xiou_any; /* for alignment */
621 /* IV xio_lines is now in IVX $. */
622 IV xio_page; /* $% */
623 IV xio_page_len; /* $= */
624 IV xio_lines_left; /* $- */
625 char * xio_top_name; /* $^ */
626 GV * xio_top_gv; /* $^ */
627 char * xio_fmt_name; /* $~ */
628 GV * xio_fmt_gv; /* $~ */
629 char * xio_bottom_name;/* $^B */
630 GV * xio_bottom_gv; /* $^B */
635 #define xio_dirp xio_dirpu.xiou_dirp
636 #define xio_any xio_dirpu.xiou_any
638 #define IOf_ARGV 1 /* this fp iterates over ARGV */
639 #define IOf_START 2 /* check for null ARGV and substitute '-' */
640 #define IOf_FLUSH 4 /* this fp wants a flush after write op */
641 #define IOf_DIDTOP 8 /* just did top of form */
642 #define IOf_UNTAINT 16 /* consider this fp (and its data) "safe" */
643 #define IOf_NOLINE 32 /* slurped a pseudo-line from empty file */
644 #define IOf_FAKE_DIRP 64 /* xio_dirp is fake (source filters kludge)
645 Also, when this is set, SvPVX() is valid */
647 /* The following macros define implementation-independent predicates on SVs. */
650 =for apidoc Am|U32|SvNIOK|SV* sv
651 Returns a U32 value indicating whether the SV contains a number, integer or
654 =for apidoc Am|U32|SvNIOKp|SV* sv
655 Returns a U32 value indicating whether the SV contains a number, integer or
656 double. Checks the B<private> setting. Use C<SvNIOK> instead.
658 =for apidoc Am|void|SvNIOK_off|SV* sv
659 Unsets the NV/IV status of an SV.
661 =for apidoc Am|U32|SvOK|SV* sv
662 Returns a U32 value indicating whether the value is defined. This is
663 only meaningful for scalars.
665 =for apidoc Am|U32|SvIOKp|SV* sv
666 Returns a U32 value indicating whether the SV contains an integer. Checks
667 the B<private> setting. Use C<SvIOK> instead.
669 =for apidoc Am|U32|SvNOKp|SV* sv
670 Returns a U32 value indicating whether the SV contains a double. Checks the
671 B<private> setting. Use C<SvNOK> instead.
673 =for apidoc Am|U32|SvPOKp|SV* sv
674 Returns a U32 value indicating whether the SV contains a character string.
675 Checks the B<private> setting. Use C<SvPOK> instead.
677 =for apidoc Am|U32|SvIOK|SV* sv
678 Returns a U32 value indicating whether the SV contains an integer.
680 =for apidoc Am|void|SvIOK_on|SV* sv
681 Tells an SV that it is an integer.
683 =for apidoc Am|void|SvIOK_off|SV* sv
684 Unsets the IV status of an SV.
686 =for apidoc Am|void|SvIOK_only|SV* sv
687 Tells an SV that it is an integer and disables all other OK bits.
689 =for apidoc Am|void|SvIOK_only_UV|SV* sv
690 Tells an SV that it is an unsigned integer and disables all other OK bits.
692 =for apidoc Am|bool|SvIOK_UV|SV* sv
693 Returns a boolean indicating whether the SV contains an integer that must be
694 interpreted as unsigned. A non-negative integer whose value is within the
695 range of both an IV and a UV may be be flagged as either SvUOK or SVIOK.
697 =for apidoc Am|bool|SvUOK|SV* sv
698 Returns a boolean indicating whether the SV contains an integer that must be
699 interpreted as unsigned. A non-negative integer whose value is within the
700 range of both an IV and a UV may be be flagged as either SvUOK or SVIOK.
702 =for apidoc Am|bool|SvIOK_notUV|SV* sv
703 Returns a boolean indicating whether the SV contains a signed integer.
705 =for apidoc Am|U32|SvNOK|SV* sv
706 Returns a U32 value indicating whether the SV contains a double.
708 =for apidoc Am|void|SvNOK_on|SV* sv
709 Tells an SV that it is a double.
711 =for apidoc Am|void|SvNOK_off|SV* sv
712 Unsets the NV status of an SV.
714 =for apidoc Am|void|SvNOK_only|SV* sv
715 Tells an SV that it is a double and disables all other OK bits.
717 =for apidoc Am|U32|SvPOK|SV* sv
718 Returns a U32 value indicating whether the SV contains a character
721 =for apidoc Am|void|SvPOK_on|SV* sv
722 Tells an SV that it is a string.
724 =for apidoc Am|void|SvPOK_off|SV* sv
725 Unsets the PV status of an SV.
727 =for apidoc Am|void|SvPOK_only|SV* sv
728 Tells an SV that it is a string and disables all other OK bits.
729 Will also turn off the UTF-8 status.
731 =for apidoc Am|bool|SvVOK|SV* sv
732 Returns a boolean indicating whether the SV contains a v-string.
734 =for apidoc Am|U32|SvOOK|SV* sv
735 Returns a U32 indicating whether the pointer to the string buffer is offset.
736 This hack is used internally to speed up removal of characters from the
737 beginning of a SvPV. When SvOOK is true, then the start of the
738 allocated string buffer is actually C<SvOOK_offset()> bytes before SvPVX.
739 This offset used to be stored in SvIVX, but is now stored within the spare
742 =for apidoc Am|U32|SvROK|SV* sv
743 Tests if the SV is an RV.
745 =for apidoc Am|void|SvROK_on|SV* sv
746 Tells an SV that it is an RV.
748 =for apidoc Am|void|SvROK_off|SV* sv
749 Unsets the RV status of an SV.
751 =for apidoc Am|SV*|SvRV|SV* sv
752 Dereferences an RV to return the SV.
754 =for apidoc Am|IV|SvIVX|SV* sv
755 Returns the raw value in the SV's IV slot, without checks or conversions.
756 Only use when you are sure SvIOK is true. See also C<SvIV()>.
758 =for apidoc Am|UV|SvUVX|SV* sv
759 Returns the raw value in the SV's UV slot, without checks or conversions.
760 Only use when you are sure SvIOK is true. See also C<SvUV()>.
762 =for apidoc Am|NV|SvNVX|SV* sv
763 Returns the raw value in the SV's NV slot, without checks or conversions.
764 Only use when you are sure SvNOK is true. See also C<SvNV()>.
766 =for apidoc Am|char*|SvPVX|SV* sv
767 Returns a pointer to the physical string in the SV. The SV must contain a
768 string. Prior to 5.9.3 it is not safe
769 to execute this macro unless the SV's
772 This is also used to store the name of an autoloaded subroutine in an XS
773 AUTOLOAD routine. See L<perlguts/Autoloading with XSUBs>.
775 =for apidoc Am|STRLEN|SvCUR|SV* sv
776 Returns the length of the string which is in the SV. See C<SvLEN>.
778 =for apidoc Am|STRLEN|SvLEN|SV* sv
779 Returns the size of the string buffer in the SV, not including any part
780 attributable to C<SvOOK>. See C<SvCUR>.
782 =for apidoc Am|char*|SvEND|SV* sv
783 Returns a pointer to the spot just after the last character in
784 the string which is in the SV, where there is usually a trailing
785 C<NUL> character (even though Perl scalars do not strictly require it).
786 See C<SvCUR>. Access the character as *(SvEND(sv)).
788 Warning: If C<SvCUR> is equal to C<SvLEN>, then C<SvEND> points to
791 =for apidoc Am|HV*|SvSTASH|SV* sv
792 Returns the stash of the SV.
794 =for apidoc Am|void|SvIV_set|SV* sv|IV val
795 Set the value of the IV pointer in sv to val. It is possible to perform
796 the same function of this macro with an lvalue assignment to C<SvIVX>.
797 With future Perls, however, it will be more efficient to use
798 C<SvIV_set> instead of the lvalue assignment to C<SvIVX>.
800 =for apidoc Am|void|SvNV_set|SV* sv|NV val
801 Set the value of the NV pointer in sv to val. See C<SvIV_set>.
803 =for apidoc Am|void|SvPV_set|SV* sv|char* val
804 This is probably not what you want to use, you probably wanted
805 L</sv_usepvn_flags> or L</sv_setpvn> or L</sv_setpvs>.
807 Set the value of the PV pointer in C<sv> to the Perl allocated
808 C<NUL>-terminated string C<val>. See also C<SvIV_set>.
810 Remember to free the previous PV buffer. There are many things to check.
811 Beware that the existing pointer may be involved in copy-on-write or other
812 mischief, so do C<SvOOK_off(sv)> and use C<sv_force_normal> or
813 C<SvPV_force> (or check the SvIsCOW flag) first to make sure this
814 modification is safe. Then finally, if it is not a COW, call C<SvPV_free> to
815 free the previous PV buffer.
817 =for apidoc Am|void|SvUV_set|SV* sv|UV val
818 Set the value of the UV pointer in sv to val. See C<SvIV_set>.
820 =for apidoc Am|void|SvRV_set|SV* sv|SV* val
821 Set the value of the RV pointer in sv to val. See C<SvIV_set>.
823 =for apidoc Am|void|SvMAGIC_set|SV* sv|MAGIC* val
824 Set the value of the MAGIC pointer in sv to val. See C<SvIV_set>.
826 =for apidoc Am|void|SvSTASH_set|SV* sv|HV* val
827 Set the value of the STASH pointer in sv to val. See C<SvIV_set>.
829 =for apidoc Am|void|SvCUR_set|SV* sv|STRLEN len
830 Set the current length of the string which is in the SV. See C<SvCUR>
833 =for apidoc Am|void|SvLEN_set|SV* sv|STRLEN len
834 Set the actual length of the string which is in the SV. See C<SvIV_set>.
839 #define SvNIOK(sv) (SvFLAGS(sv) & (SVf_IOK|SVf_NOK))
840 #define SvNIOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK))
841 #define SvNIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK| \
842 SVp_IOK|SVp_NOK|SVf_IVisUV))
844 #define assert_not_ROK(sv) assert_(!SvROK(sv) || !SvRV(sv))
845 #define assert_not_glob(sv) assert_(!isGV_with_GP(sv))
847 #define SvOK(sv) (SvFLAGS(sv) & SVf_OK || isREGEXP(sv))
848 #define SvOK_off(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
849 SvFLAGS(sv) &= ~(SVf_OK| \
850 SVf_IVisUV|SVf_UTF8), \
852 #define SvOK_off_exc_UV(sv) (assert_not_ROK(sv) \
853 SvFLAGS(sv) &= ~(SVf_OK| \
857 #define SvOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK))
858 #define SvIOKp(sv) (SvFLAGS(sv) & SVp_IOK)
859 #define SvIOKp_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
860 SvFLAGS(sv) |= SVp_IOK)
861 #define SvNOKp(sv) (SvFLAGS(sv) & SVp_NOK)
862 #define SvNOKp_on(sv) (assert_not_glob(sv) SvFLAGS(sv) |= SVp_NOK)
863 #define SvPOKp(sv) (SvFLAGS(sv) & SVp_POK)
864 #define SvPOKp_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
865 SvFLAGS(sv) |= SVp_POK)
867 #define SvIOK(sv) (SvFLAGS(sv) & SVf_IOK)
868 #define SvIOK_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
869 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
870 #define SvIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVp_IOK|SVf_IVisUV))
871 #define SvIOK_only(sv) (SvOK_off(sv), \
872 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
873 #define SvIOK_only_UV(sv) (assert_not_glob(sv) SvOK_off_exc_UV(sv), \
874 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
876 #define SvIOK_UV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
877 == (SVf_IOK|SVf_IVisUV))
878 #define SvUOK(sv) SvIOK_UV(sv)
879 #define SvIOK_notUV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
882 #define SvIsUV(sv) (SvFLAGS(sv) & SVf_IVisUV)
883 #define SvIsUV_on(sv) (SvFLAGS(sv) |= SVf_IVisUV)
884 #define SvIsUV_off(sv) (SvFLAGS(sv) &= ~SVf_IVisUV)
886 #define SvNOK(sv) (SvFLAGS(sv) & SVf_NOK)
887 #define SvNOK_on(sv) (assert_not_glob(sv) \
888 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
889 #define SvNOK_off(sv) (SvFLAGS(sv) &= ~(SVf_NOK|SVp_NOK))
890 #define SvNOK_only(sv) (SvOK_off(sv), \
891 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
894 =for apidoc Am|U32|SvUTF8|SV* sv
895 Returns a U32 value indicating the UTF-8 status of an SV. If things are set-up
896 properly, this indicates whether or not the SV contains UTF-8 encoded data.
897 You should use this I<after> a call to SvPV() or one of its variants, in
898 case any call to string overloading updates the internal flag.
900 If you want to take into account the L<bytes> pragma, use C<L</DO_UTF8>>
903 =for apidoc Am|void|SvUTF8_on|SV *sv
904 Turn on the UTF-8 status of an SV (the data is not changed, just the flag).
905 Do not use frivolously.
907 =for apidoc Am|void|SvUTF8_off|SV *sv
908 Unsets the UTF-8 status of an SV (the data is not changed, just the flag).
909 Do not use frivolously.
911 =for apidoc Am|void|SvPOK_only_UTF8|SV* sv
912 Tells an SV that it is a string and disables all other OK bits,
913 and leaves the UTF-8 status as it was.
918 /* Ensure the return value of this macro does not clash with the GV_ADD* flags
920 #define SvUTF8(sv) (SvFLAGS(sv) & SVf_UTF8)
921 #define SvUTF8_on(sv) (SvFLAGS(sv) |= (SVf_UTF8))
922 #define SvUTF8_off(sv) (SvFLAGS(sv) &= ~(SVf_UTF8))
924 #define SvPOK(sv) (SvFLAGS(sv) & SVf_POK)
925 #define SvPOK_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
926 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
927 #define SvPOK_off(sv) (SvFLAGS(sv) &= ~(SVf_POK|SVp_POK))
928 #define SvPOK_only(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
929 SvFLAGS(sv) &= ~(SVf_OK| \
930 SVf_IVisUV|SVf_UTF8), \
931 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
932 #define SvPOK_only_UTF8(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
933 SvFLAGS(sv) &= ~(SVf_OK| \
935 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
937 #define SvVOK(sv) (SvMAGICAL(sv) \
938 && mg_find(sv,PERL_MAGIC_vstring))
939 /* returns the vstring magic, if any */
940 #define SvVSTRING_mg(sv) (SvMAGICAL(sv) \
941 ? mg_find(sv,PERL_MAGIC_vstring) : NULL)
943 #define SvOOK(sv) (SvFLAGS(sv) & SVf_OOK)
944 #define SvOOK_on(sv) (SvFLAGS(sv) |= SVf_OOK)
945 #define SvOOK_off(sv) ((void)(SvOOK(sv) && sv_backoff(sv)))
947 #define SvFAKE(sv) (SvFLAGS(sv) & SVf_FAKE)
948 #define SvFAKE_on(sv) (SvFLAGS(sv) |= SVf_FAKE)
949 #define SvFAKE_off(sv) (SvFLAGS(sv) &= ~SVf_FAKE)
951 #define SvROK(sv) (SvFLAGS(sv) & SVf_ROK)
952 #define SvROK_on(sv) (SvFLAGS(sv) |= SVf_ROK)
953 #define SvROK_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK))
955 #define SvMAGICAL(sv) (SvFLAGS(sv) & (SVs_GMG|SVs_SMG|SVs_RMG))
956 #define SvMAGICAL_on(sv) (SvFLAGS(sv) |= (SVs_GMG|SVs_SMG|SVs_RMG))
957 #define SvMAGICAL_off(sv) (SvFLAGS(sv) &= ~(SVs_GMG|SVs_SMG|SVs_RMG))
959 #define SvGMAGICAL(sv) (SvFLAGS(sv) & SVs_GMG)
960 #define SvGMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_GMG)
961 #define SvGMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_GMG)
963 #define SvSMAGICAL(sv) (SvFLAGS(sv) & SVs_SMG)
964 #define SvSMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_SMG)
965 #define SvSMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_SMG)
967 #define SvRMAGICAL(sv) (SvFLAGS(sv) & SVs_RMG)
968 #define SvRMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_RMG)
969 #define SvRMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_RMG)
971 #define SvAMAGIC(sv) (SvROK(sv) && SvOBJECT(SvRV(sv)) && \
972 HvAMAGIC(SvSTASH(SvRV(sv))))
974 /* To be used on the stashes themselves: */
975 #define HvAMAGIC(hv) (SvFLAGS(hv) & SVf_AMAGIC)
976 #define HvAMAGIC_on(hv) (SvFLAGS(hv) |= SVf_AMAGIC)
977 #define HvAMAGIC_off(hv) (SvFLAGS(hv) &=~ SVf_AMAGIC)
980 /* "nog" means "doesn't have get magic" */
981 #define SvPOK_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVs_GMG)) == SVf_POK)
982 #define SvIOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVs_GMG)) == SVf_IOK)
983 #define SvUOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
984 #define SvNOK_nog(sv) ((SvFLAGS(sv) & (SVf_NOK|SVs_GMG)) == SVf_NOK)
985 #define SvNIOK_nog(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & SVs_GMG))
987 #define SvPOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
988 #define SvIOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_THINKFIRST|SVs_GMG)) == SVf_IOK)
989 #define SvUOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVf_THINKFIRST|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
990 #define SvNOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_NOK|SVf_THINKFIRST|SVs_GMG)) == SVf_NOK)
991 #define SvNIOK_nogthink(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & (SVf_THINKFIRST|SVs_GMG)))
993 #define SvPOK_utf8_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == (SVf_POK|SVf_UTF8))
994 #define SvPOK_utf8_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
996 #define SvPOK_byte_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == SVf_POK)
997 #define SvPOK_byte_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
999 #define SvPOK_pure_nogthink(sv) \
1000 ((SvFLAGS(sv) & (SVf_POK|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
1001 #define SvPOK_utf8_pure_nogthink(sv) \
1002 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
1003 #define SvPOK_byte_pure_nogthink(sv) \
1004 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
1007 =for apidoc Am|U32|SvGAMAGIC|SV* sv
1009 Returns true if the SV has get magic or
1010 overloading. If either is true then
1011 the scalar is active data, and has the potential to return a new value every
1012 time it is accessed. Hence you must be careful to
1013 only read it once per user logical operation and work
1014 with that returned value. If neither is true then
1015 the scalar's value cannot change unless written to.
1020 #define SvGAMAGIC(sv) (SvGMAGICAL(sv) || SvAMAGIC(sv))
1022 #define Gv_AMG(stash) \
1023 (HvNAME(stash) && Gv_AMupdate(stash,FALSE) \
1025 : (HvAMAGIC_off(stash), 0))
1027 #define SvWEAKREF(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_WEAKREF)) \
1028 == (SVf_ROK|SVprv_WEAKREF))
1029 #define SvWEAKREF_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_WEAKREF))
1030 #define SvWEAKREF_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_WEAKREF))
1032 #define SvPCS_IMPORTED(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_PCS_IMPORTED)) \
1033 == (SVf_ROK|SVprv_PCS_IMPORTED))
1034 #define SvPCS_IMPORTED_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_PCS_IMPORTED))
1035 #define SvPCS_IMPORTED_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_PCS_IMPORTED))
1038 =for apidoc m|U32|SvTHINKFIRST|SV *sv
1040 A quick flag check to see whether an sv should be passed to sv_force_normal
1041 to be "downgraded" before SvIVX or SvPVX can be modified directly.
1043 For example, if your scalar is a reference and you want to modify the SvIVX
1044 slot, you can't just do SvROK_off, as that will leak the referent.
1046 This is used internally by various sv-modifying functions, such as
1047 sv_setsv, sv_setiv and sv_pvn_force.
1049 One case that this does not handle is a gv without SvFAKE set. After
1051 if (SvTHINKFIRST(gv)) sv_force_normal(gv);
1053 it will still be a gv.
1055 SvTHINKFIRST sometimes produces false positives. In those cases
1056 sv_force_normal does nothing.
1061 #define SvTHINKFIRST(sv) (SvFLAGS(sv) & SVf_THINKFIRST)
1064 #define SvPADMY(sv) !(SvFLAGS(sv) & SVs_PADTMP)
1066 # define SvPADMY_on(sv) SvPADTMP_off(sv)
1069 #define SvPADTMP(sv) (SvFLAGS(sv) & (SVs_PADTMP))
1070 #define SvPADSTALE(sv) (SvFLAGS(sv) & (SVs_PADSTALE))
1072 #define SvPADTMP_on(sv) (SvFLAGS(sv) |= SVs_PADTMP)
1073 #define SvPADTMP_off(sv) (SvFLAGS(sv) &= ~SVs_PADTMP)
1074 #define SvPADSTALE_on(sv) S_SvPADSTALE_on(MUTABLE_SV(sv))
1075 #define SvPADSTALE_off(sv) S_SvPADSTALE_off(MUTABLE_SV(sv))
1077 #define SvTEMP(sv) (SvFLAGS(sv) & SVs_TEMP)
1078 #define SvTEMP_on(sv) (SvFLAGS(sv) |= SVs_TEMP)
1079 #define SvTEMP_off(sv) (SvFLAGS(sv) &= ~SVs_TEMP)
1081 #define SvOBJECT(sv) (SvFLAGS(sv) & SVs_OBJECT)
1082 #define SvOBJECT_on(sv) (SvFLAGS(sv) |= SVs_OBJECT)
1083 #define SvOBJECT_off(sv) (SvFLAGS(sv) &= ~SVs_OBJECT)
1085 #define SvREADONLY(sv) (SvFLAGS(sv) & (SVf_READONLY|SVf_PROTECT))
1087 # define SvREADONLY_on(sv) (SvFLAGS(sv) |= (SVf_READONLY|SVf_PROTECT))
1088 # define SvREADONLY_off(sv) (SvFLAGS(sv) &=~(SVf_READONLY|SVf_PROTECT))
1090 # define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1091 # define SvREADONLY_off(sv) (SvFLAGS(sv) &= ~SVf_READONLY)
1094 #define SvSCREAM(sv) ((SvFLAGS(sv) & (SVp_SCREAM|SVp_POK)) == (SVp_SCREAM|SVp_POK))
1095 #define SvSCREAM_on(sv) (SvFLAGS(sv) |= SVp_SCREAM)
1096 #define SvSCREAM_off(sv) (SvFLAGS(sv) &= ~SVp_SCREAM)
1099 # define SvCOMPILED(sv) 0
1100 # define SvCOMPILED_on(sv)
1101 # define SvCOMPILED_off(sv)
1104 #define SvEVALED(sv) (SvFLAGS(sv) & SVrepl_EVAL)
1105 #define SvEVALED_on(sv) (SvFLAGS(sv) |= SVrepl_EVAL)
1106 #define SvEVALED_off(sv) (SvFLAGS(sv) &= ~SVrepl_EVAL)
1108 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1109 # define SvVALID(sv) ({ const SV *const _svvalid = (const SV*)(sv); \
1110 if (SvFLAGS(_svvalid) & SVpbm_VALID && !SvSCREAM(_svvalid)) \
1111 assert(!isGV_with_GP(_svvalid)); \
1112 (SvFLAGS(_svvalid) & SVpbm_VALID); \
1114 # define SvVALID_on(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
1115 assert(!isGV_with_GP(_svvalid)); \
1116 assert(!SvSCREAM(_svvalid)); \
1117 (SvFLAGS(_svvalid) |= SVpbm_VALID); \
1119 # define SvVALID_off(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
1120 assert(!isGV_with_GP(_svvalid)); \
1121 assert(!SvSCREAM(_svvalid)); \
1122 (SvFLAGS(_svvalid) &= ~SVpbm_VALID); \
1125 # define SvTAIL(sv) ({ const SV *const _svtail = (const SV *)(sv); \
1126 assert(SvTYPE(_svtail) != SVt_PVAV); \
1127 assert(SvTYPE(_svtail) != SVt_PVHV); \
1128 assert(!SvSCREAM(_svtail)); \
1129 (SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1130 == (SVpbm_TAIL|SVpbm_VALID); \
1133 # define SvVALID(sv) ((SvFLAGS(sv) & SVpbm_VALID) && !SvSCREAM(sv))
1134 # define SvVALID_on(sv) (SvFLAGS(sv) |= SVpbm_VALID)
1135 # define SvVALID_off(sv) (SvFLAGS(sv) &= ~SVpbm_VALID)
1136 # define SvTAIL(sv) ((SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1137 == (SVpbm_TAIL|SVpbm_VALID))
1140 #define SvTAIL_on(sv) (SvFLAGS(sv) |= SVpbm_TAIL)
1141 #define SvTAIL_off(sv) (SvFLAGS(sv) &= ~SVpbm_TAIL)
1143 #define SvRVx(sv) SvRV(sv)
1145 #ifdef PERL_DEBUG_COW
1146 /* Need -0.0 for SvNVX to preserve IEEE FP "negative zero" because
1147 +0.0 + -0.0 => +0.0 but -0.0 + -0.0 => -0.0 */
1148 # define SvIVX(sv) (0 + ((XPVIV*) SvANY(sv))->xiv_iv)
1149 # define SvUVX(sv) (0 + ((XPVUV*) SvANY(sv))->xuv_uv)
1150 # define SvNVX(sv) (-0.0 + ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv)
1151 # define SvRV(sv) (0 + (sv)->sv_u.svu_rv)
1152 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1153 /* Don't test the core XS code yet. */
1154 # if defined (PERL_CORE) && PERL_DEBUG_COW > 1
1155 # define SvPVX(sv) (0 + (assert_(!SvREADONLY(sv)) (sv)->sv_u.svu_pv))
1157 # define SvPVX(sv) SvPVX_mutable(sv)
1159 # define SvCUR(sv) (0 + ((XPV*) SvANY(sv))->xpv_cur)
1160 # define SvLEN(sv) (0 + ((XPV*) SvANY(sv))->xpv_len)
1161 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1163 # define SvMAGIC(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_u.xmg_magic))
1164 # define SvSTASH(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_stash))
1166 # define SvLEN(sv) ((XPV*) SvANY(sv))->xpv_len
1167 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1169 # if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1170 /* These get expanded inside other macros that already use a variable _sv */
1171 # define SvPVX(sv) \
1172 (*({ SV *const _svpvx = MUTABLE_SV(sv); \
1173 assert(PL_valid_types_PVX[SvTYPE(_svpvx) & SVt_MASK]); \
1174 assert(!isGV_with_GP(_svpvx)); \
1175 assert(!(SvTYPE(_svpvx) == SVt_PVIO \
1176 && !(IoFLAGS(_svpvx) & IOf_FAKE_DIRP))); \
1177 &((_svpvx)->sv_u.svu_pv); \
1179 # define SvCUR(sv) \
1180 (*({ const SV *const _svcur = (const SV *)(sv); \
1181 assert(PL_valid_types_PVX[SvTYPE(_svcur) & SVt_MASK] \
1182 || SvTYPE(_svcur) == SVt_REGEXP); \
1183 assert(!isGV_with_GP(_svcur)); \
1184 assert(!(SvTYPE(_svcur) == SVt_PVIO \
1185 && !(IoFLAGS(_svcur) & IOf_FAKE_DIRP))); \
1186 &(((XPV*) MUTABLE_PTR(SvANY(_svcur)))->xpv_cur); \
1188 # define SvIVX(sv) \
1189 (*({ const SV *const _svivx = (const SV *)(sv); \
1190 assert(PL_valid_types_IVX[SvTYPE(_svivx) & SVt_MASK]); \
1191 assert(!isGV_with_GP(_svivx)); \
1192 &(((XPVIV*) MUTABLE_PTR(SvANY(_svivx)))->xiv_iv); \
1194 # define SvUVX(sv) \
1195 (*({ const SV *const _svuvx = (const SV *)(sv); \
1196 assert(PL_valid_types_IVX[SvTYPE(_svuvx) & SVt_MASK]); \
1197 assert(!isGV_with_GP(_svuvx)); \
1198 &(((XPVUV*) MUTABLE_PTR(SvANY(_svuvx)))->xuv_uv); \
1200 # define SvNVX(sv) \
1201 (*({ const SV *const _svnvx = (const SV *)(sv); \
1202 assert(PL_valid_types_NVX[SvTYPE(_svnvx) & SVt_MASK]); \
1203 assert(!isGV_with_GP(_svnvx)); \
1204 &(((XPVNV*) MUTABLE_PTR(SvANY(_svnvx)))->xnv_u.xnv_nv); \
1207 (*({ SV *const _svrv = MUTABLE_SV(sv); \
1208 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1209 assert(!isGV_with_GP(_svrv)); \
1210 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1211 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1212 &((_svrv)->sv_u.svu_rv); \
1214 # define SvRV_const(sv) \
1215 ({ const SV *const _svrv = (const SV *)(sv); \
1216 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1217 assert(!isGV_with_GP(_svrv)); \
1218 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1219 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1220 (_svrv)->sv_u.svu_rv; \
1222 # define SvMAGIC(sv) \
1223 (*({ const SV *const _svmagic = (const SV *)(sv); \
1224 assert(SvTYPE(_svmagic) >= SVt_PVMG); \
1225 &(((XPVMG*) MUTABLE_PTR(SvANY(_svmagic)))->xmg_u.xmg_magic); \
1227 # define SvSTASH(sv) \
1228 (*({ const SV *const _svstash = (const SV *)(sv); \
1229 assert(SvTYPE(_svstash) >= SVt_PVMG); \
1230 &(((XPVMG*) MUTABLE_PTR(SvANY(_svstash)))->xmg_stash); \
1233 # define SvPVX(sv) ((sv)->sv_u.svu_pv)
1234 # define SvCUR(sv) ((XPV*) SvANY(sv))->xpv_cur
1235 # define SvIVX(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1236 # define SvUVX(sv) ((XPVUV*) SvANY(sv))->xuv_uv
1237 # define SvNVX(sv) ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv
1238 # define SvRV(sv) ((sv)->sv_u.svu_rv)
1239 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1240 # define SvMAGIC(sv) ((XPVMG*) SvANY(sv))->xmg_u.xmg_magic
1241 # define SvSTASH(sv) ((XPVMG*) SvANY(sv))->xmg_stash
1246 /* Given that these two are new, there can't be any existing code using them
1248 # define SvPVX_mutable(sv) (0 + (sv)->sv_u.svu_pv)
1249 # define SvPVX_const(sv) ((const char*)(0 + (sv)->sv_u.svu_pv))
1251 /* Except for the poison code, which uses & to scribble over the pointer after
1252 free() is called. */
1253 # define SvPVX_mutable(sv) ((sv)->sv_u.svu_pv)
1254 # define SvPVX_const(sv) ((const char*)((sv)->sv_u.svu_pv))
1257 #define SvIVXx(sv) SvIVX(sv)
1258 #define SvUVXx(sv) SvUVX(sv)
1259 #define SvNVXx(sv) SvNVX(sv)
1260 #define SvPVXx(sv) SvPVX(sv)
1261 #define SvLENx(sv) SvLEN(sv)
1262 #define SvENDx(sv) ((PL_Sv = (sv)), SvEND(PL_Sv))
1265 /* Ask a scalar nicely to try to become an IV, if possible.
1266 Not guaranteed to stay returning void */
1267 /* Macro won't actually call sv_2iv if already IOK */
1268 #define SvIV_please(sv) \
1269 STMT_START {if (!SvIOKp(sv) && (SvFLAGS(sv) & (SVf_NOK|SVf_POK))) \
1270 (void) SvIV(sv); } STMT_END
1271 #define SvIV_please_nomg(sv) \
1272 (!(SvFLAGS(sv) & (SVf_IOK|SVp_IOK)) && (SvFLAGS(sv) & (SVf_NOK|SVf_POK)) \
1273 ? (sv_2iv_flags(sv, 0), SvIOK(sv)) \
1275 #define SvIV_set(sv, val) \
1277 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1278 assert(!isGV_with_GP(sv)); \
1279 (((XPVIV*) SvANY(sv))->xiv_iv = (val)); } STMT_END
1280 #define SvNV_set(sv, val) \
1282 assert(PL_valid_types_NV_set[SvTYPE(sv) & SVt_MASK]); \
1283 assert(!isGV_with_GP(sv)); \
1284 (((XPVNV*)SvANY(sv))->xnv_u.xnv_nv = (val)); } STMT_END
1285 #define SvPV_set(sv, val) \
1287 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1288 assert(!isGV_with_GP(sv)); \
1289 assert(!(SvTYPE(sv) == SVt_PVIO \
1290 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1291 ((sv)->sv_u.svu_pv = (val)); } STMT_END
1292 #define SvUV_set(sv, val) \
1294 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1295 assert(!isGV_with_GP(sv)); \
1296 (((XPVUV*)SvANY(sv))->xuv_uv = (val)); } STMT_END
1297 #define SvRV_set(sv, val) \
1299 assert(PL_valid_types_RV[SvTYPE(sv) & SVt_MASK]); \
1300 assert(!isGV_with_GP(sv)); \
1301 assert(!(SvTYPE(sv) == SVt_PVIO \
1302 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1303 ((sv)->sv_u.svu_rv = (val)); } STMT_END
1304 #define SvMAGIC_set(sv, val) \
1305 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1306 (((XPVMG*)SvANY(sv))->xmg_u.xmg_magic = (val)); } STMT_END
1307 #define SvSTASH_set(sv, val) \
1308 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1309 (((XPVMG*) SvANY(sv))->xmg_stash = (val)); } STMT_END
1310 #define SvCUR_set(sv, val) \
1312 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK] \
1313 || SvTYPE(sv) == SVt_REGEXP); \
1314 assert(!isGV_with_GP(sv)); \
1315 assert(!(SvTYPE(sv) == SVt_PVIO \
1316 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1317 (((XPV*) SvANY(sv))->xpv_cur = (val)); } STMT_END
1318 #define SvLEN_set(sv, val) \
1320 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1321 assert(!isGV_with_GP(sv)); \
1322 assert(!(SvTYPE(sv) == SVt_PVIO \
1323 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1324 (((XPV*) SvANY(sv))->xpv_len = (val)); } STMT_END
1325 #define SvEND_set(sv, val) \
1326 STMT_START { assert(SvTYPE(sv) >= SVt_PV); \
1327 SvCUR_set(sv, (val) - SvPVX(sv)); } STMT_END
1329 #define SvPV_renew(sv,n) \
1330 STMT_START { SvLEN_set(sv, n); \
1331 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
1332 (char*)saferealloc((Malloc_t)SvPVX(sv), \
1333 (MEM_SIZE)((n))))); \
1336 #define SvPV_shrink_to_cur(sv) STMT_START { \
1337 const STRLEN _lEnGtH = SvCUR(sv) + 1; \
1338 SvPV_renew(sv, _lEnGtH); \
1341 #define SvPV_free(sv) \
1343 assert(SvTYPE(sv) >= SVt_PV); \
1345 assert(!SvROK(sv)); \
1346 if(UNLIKELY(SvOOK(sv))) { \
1348 SvOOK_offset(sv, zok); \
1349 SvPV_set(sv, SvPVX_mutable(sv) - zok); \
1350 SvFLAGS(sv) &= ~SVf_OOK; \
1352 Safefree(SvPVX(sv)); \
1357 /* Code that crops up in three places to take a scalar and ready it to hold
1359 # define prepare_SV_for_RV(sv) \
1361 if (SvTYPE(sv) < SVt_PV && SvTYPE(sv) != SVt_IV) \
1362 sv_upgrade(sv, SVt_IV); \
1363 else if (SvTYPE(sv) >= SVt_PV) { \
1372 # define BmFLAGS(sv) (SvTAIL(sv) ? FBMcf_TAIL : 0)
1375 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1376 # define BmUSEFUL(sv) \
1377 (*({ SV *const _bmuseful = MUTABLE_SV(sv); \
1378 assert(SvTYPE(_bmuseful) >= SVt_PVIV); \
1379 assert(SvVALID(_bmuseful)); \
1380 assert(!SvIOK(_bmuseful)); \
1381 &(((XPVIV*) SvANY(_bmuseful))->xiv_u.xivu_iv); \
1384 # define BmUSEFUL(sv) ((XPVIV*) SvANY(sv))->xiv_u.xivu_iv
1389 # define BmRARE(sv) 0
1390 # define BmPREVIOUS(sv) 0
1393 #define FmLINES(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1395 #define LvTYPE(sv) ((XPVLV*) SvANY(sv))->xlv_type
1396 #define LvTARG(sv) ((XPVLV*) SvANY(sv))->xlv_targ
1397 #define LvTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff
1398 #define LvSTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff_u.xlvu_stargoff
1399 #define LvTARGLEN(sv) ((XPVLV*) SvANY(sv))->xlv_targlen
1400 #define LvFLAGS(sv) ((XPVLV*) SvANY(sv))->xlv_flags
1402 #define IoIFP(sv) (sv)->sv_u.svu_fp
1403 #define IoOFP(sv) ((XPVIO*) SvANY(sv))->xio_ofp
1404 #define IoDIRP(sv) ((XPVIO*) SvANY(sv))->xio_dirp
1405 #define IoANY(sv) ((XPVIO*) SvANY(sv))->xio_any
1406 #define IoLINES(sv) ((XPVIO*) SvANY(sv))->xiv_u.xivu_iv
1407 #define IoPAGE(sv) ((XPVIO*) SvANY(sv))->xio_page
1408 #define IoPAGE_LEN(sv) ((XPVIO*) SvANY(sv))->xio_page_len
1409 #define IoLINES_LEFT(sv)((XPVIO*) SvANY(sv))->xio_lines_left
1410 #define IoTOP_NAME(sv) ((XPVIO*) SvANY(sv))->xio_top_name
1411 #define IoTOP_GV(sv) ((XPVIO*) SvANY(sv))->xio_top_gv
1412 #define IoFMT_NAME(sv) ((XPVIO*) SvANY(sv))->xio_fmt_name
1413 #define IoFMT_GV(sv) ((XPVIO*) SvANY(sv))->xio_fmt_gv
1414 #define IoBOTTOM_NAME(sv)((XPVIO*) SvANY(sv))->xio_bottom_name
1415 #define IoBOTTOM_GV(sv) ((XPVIO*) SvANY(sv))->xio_bottom_gv
1416 #define IoTYPE(sv) ((XPVIO*) SvANY(sv))->xio_type
1417 #define IoFLAGS(sv) ((XPVIO*) SvANY(sv))->xio_flags
1419 /* IoTYPE(sv) is a single character telling the type of I/O connection. */
1420 #define IoTYPE_RDONLY '<'
1421 #define IoTYPE_WRONLY '>'
1422 #define IoTYPE_RDWR '+'
1423 #define IoTYPE_APPEND 'a'
1424 #define IoTYPE_PIPE '|'
1425 #define IoTYPE_STD '-' /* stdin or stdout */
1426 #define IoTYPE_SOCKET 's'
1427 #define IoTYPE_CLOSED ' '
1428 #define IoTYPE_IMPLICIT 'I' /* stdin or stdout or stderr */
1429 #define IoTYPE_NUMERIC '#' /* fdopen */
1432 =for apidoc Am|bool|SvTAINTED|SV* sv
1433 Checks to see if an SV is tainted. Returns TRUE if it is, FALSE if
1436 =for apidoc Am|void|SvTAINTED_on|SV* sv
1437 Marks an SV as tainted if tainting is enabled.
1439 =for apidoc Am|void|SvTAINTED_off|SV* sv
1440 Untaints an SV. Be I<very> careful with this routine, as it short-circuits
1441 some of Perl's fundamental security features. XS module authors should not
1442 use this function unless they fully understand all the implications of
1443 unconditionally untainting the value. Untainting should be done in the
1444 standard perl fashion, via a carefully crafted regexp, rather than directly
1445 untainting variables.
1447 =for apidoc Am|void|SvTAINT|SV* sv
1448 Taints an SV if tainting is enabled, and if some input to the current
1449 expression is tainted--usually a variable, but possibly also implicit
1450 inputs such as locale settings. C<SvTAINT> propagates that taintedness to
1451 the outputs of an expression in a pessimistic fashion; i.e., without paying
1452 attention to precisely which outputs are influenced by which inputs.
1457 #define sv_taint(sv) sv_magic((sv), NULL, PERL_MAGIC_taint, NULL, 0)
1459 #ifdef NO_TAINT_SUPPORT
1460 # define SvTAINTED(sv) 0
1462 # define SvTAINTED(sv) (SvMAGICAL(sv) && sv_tainted(sv))
1464 #define SvTAINTED_on(sv) STMT_START{ if(UNLIKELY(TAINTING_get)){sv_taint(sv);} }STMT_END
1465 #define SvTAINTED_off(sv) STMT_START{ if(UNLIKELY(TAINTING_get)){sv_untaint(sv);} }STMT_END
1467 #define SvTAINT(sv) \
1469 if (UNLIKELY(TAINTING_get)) { \
1470 if (UNLIKELY(TAINT_get)) \
1476 =for apidoc Am|char*|SvPV_force|SV* sv|STRLEN len
1477 Like C<SvPV> but will force the SV into containing a string (C<SvPOK>), and
1478 only a string (C<SvPOK_only>), by hook or by crook. You need force if you are
1479 going to update the C<SvPVX> directly. Processes get magic.
1481 Note that coercing an arbitrary scalar into a plain PV will potentially
1482 strip useful data from it. For example if the SV was C<SvROK>, then the
1483 referent will have its reference count decremented, and the SV itself may
1484 be converted to an C<SvPOK> scalar with a string buffer containing a value
1485 such as C<"ARRAY(0x1234)">.
1487 =for apidoc Am|char*|SvPV_force_nomg|SV* sv|STRLEN len
1488 Like C<SvPV_force>, but doesn't process get magic.
1490 =for apidoc Am|char*|SvPV|SV* sv|STRLEN len
1491 Returns a pointer to the string in the SV, or a stringified form of
1492 the SV if the SV does not contain a string. The SV may cache the
1493 stringified version becoming C<SvPOK>. Handles 'get' magic. The
1494 C<len> variable will be set to the length of the string (this is a macro, so
1495 don't use C<&len>). See also C<SvPVx> for a version which guarantees to
1496 evaluate sv only once.
1498 Note that there is no guarantee that the return value of C<SvPV()> is
1499 equal to C<SvPVX(sv)>, or that C<SvPVX(sv)> contains valid data, or that
1500 successive calls to C<SvPV(sv)> will return the same pointer value each
1501 time. This is due to the way that things like overloading and
1502 Copy-On-Write are handled. In these cases, the return value may point to
1503 a temporary buffer or similar. If you absolutely need the SvPVX field to
1504 be valid (for example, if you intend to write to it), then see
1507 =for apidoc Am|char*|SvPVx|SV* sv|STRLEN len
1508 A version of C<SvPV> which guarantees to evaluate C<sv> only once.
1509 Only use this if C<sv> is an expression with side effects, otherwise use the
1510 more efficient C<SvPV>.
1512 =for apidoc Am|char*|SvPV_nomg|SV* sv|STRLEN len
1513 Like C<SvPV> but doesn't process magic.
1515 =for apidoc Am|char*|SvPV_nolen|SV* sv
1516 Like C<SvPV> but doesn't set a length variable.
1518 =for apidoc Am|char*|SvPV_nomg_nolen|SV* sv
1519 Like C<SvPV_nolen> but doesn't process magic.
1521 =for apidoc Am|IV|SvIV|SV* sv
1522 Coerces the given SV to an integer and returns it. See C<SvIVx> for a
1523 version which guarantees to evaluate sv only once.
1525 =for apidoc Am|IV|SvIV_nomg|SV* sv
1526 Like C<SvIV> but doesn't process magic.
1528 =for apidoc Am|IV|SvIVx|SV* sv
1529 Coerces the given SV to an integer and returns it.
1530 Guarantees to evaluate C<sv> only once. Only use
1531 this if C<sv> is an expression with side effects,
1532 otherwise use the more efficient C<SvIV>.
1534 =for apidoc Am|NV|SvNV|SV* sv
1535 Coerce the given SV to a double and return it. See C<SvNVx> for a version
1536 which guarantees to evaluate sv only once.
1538 =for apidoc Am|NV|SvNV_nomg|SV* sv
1539 Like C<SvNV> but doesn't process magic.
1541 =for apidoc Am|NV|SvNVx|SV* sv
1542 Coerces the given SV to a double and returns it.
1543 Guarantees to evaluate C<sv> only once. Only use
1544 this if C<sv> is an expression with side effects,
1545 otherwise use the more efficient C<SvNV>.
1547 =for apidoc Am|UV|SvUV|SV* sv
1548 Coerces the given SV to an unsigned integer and returns it. See C<SvUVx>
1549 for a version which guarantees to evaluate sv only once.
1551 =for apidoc Am|UV|SvUV_nomg|SV* sv
1552 Like C<SvUV> but doesn't process magic.
1554 =for apidoc Am|UV|SvUVx|SV* sv
1555 Coerces the given SV to an unsigned integer and
1556 returns it. Guarantees to evaluate C<sv> only once. Only
1557 use this if C<sv> is an expression with side effects,
1558 otherwise use the more efficient C<SvUV>.
1560 =for apidoc Am|bool|SvTRUE|SV* sv
1561 Returns a boolean indicating whether Perl would evaluate the SV as true or
1562 false. See SvOK() for a defined/undefined test. Handles 'get' magic
1563 unless the scalar is already SvPOK, SvIOK or SvNOK (the public, not the
1566 =for apidoc Am|bool|SvTRUE_nomg|SV* sv
1567 Returns a boolean indicating whether Perl would evaluate the SV as true or
1568 false. See SvOK() for a defined/undefined test. Does not handle 'get' magic.
1570 =for apidoc Am|char*|SvPVutf8_force|SV* sv|STRLEN len
1571 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1573 =for apidoc Am|char*|SvPVutf8|SV* sv|STRLEN len
1574 Like C<SvPV>, but converts sv to utf8 first if necessary.
1576 =for apidoc Am|char*|SvPVutf8_nolen|SV* sv
1577 Like C<SvPV_nolen>, but converts sv to utf8 first if necessary.
1579 =for apidoc Am|char*|SvPVbyte_force|SV* sv|STRLEN len
1580 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1582 =for apidoc Am|char*|SvPVbyte|SV* sv|STRLEN len
1583 Like C<SvPV>, but converts sv to byte representation first if necessary.
1585 =for apidoc Am|char*|SvPVbyte_nolen|SV* sv
1586 Like C<SvPV_nolen>, but converts sv to byte representation first if necessary.
1588 =for apidoc Am|char*|SvPVutf8x_force|SV* sv|STRLEN len
1589 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1590 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8_force>
1593 =for apidoc Am|char*|SvPVutf8x|SV* sv|STRLEN len
1594 Like C<SvPV>, but converts sv to utf8 first if necessary.
1595 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8>
1598 =for apidoc Am|char*|SvPVbytex_force|SV* sv|STRLEN len
1599 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1600 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte_force>
1603 =for apidoc Am|char*|SvPVbytex|SV* sv|STRLEN len
1604 Like C<SvPV>, but converts sv to byte representation first if necessary.
1605 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte>
1608 =for apidoc Am|U32|SvIsCOW|SV* sv
1609 Returns a U32 value indicating whether the SV is Copy-On-Write (either shared
1610 hash key scalars, or full Copy On Write scalars if 5.9.0 is configured for
1613 =for apidoc Am|bool|SvIsCOW_shared_hash|SV* sv
1614 Returns a boolean indicating whether the SV is Copy-On-Write shared hash key
1617 =for apidoc Am|void|sv_catpvn_nomg|SV* sv|const char* ptr|STRLEN len
1618 Like C<sv_catpvn> but doesn't process magic.
1620 =for apidoc Am|void|sv_catpv_nomg|SV* sv|const char* ptr
1621 Like C<sv_catpv> but doesn't process magic.
1623 =for apidoc Am|void|sv_setsv_nomg|SV* dsv|SV* ssv
1624 Like C<sv_setsv> but doesn't process magic.
1626 =for apidoc Am|void|sv_catsv_nomg|SV* dsv|SV* ssv
1627 Like C<sv_catsv> but doesn't process magic.
1629 =for apidoc Amdb|STRLEN|sv_utf8_upgrade_nomg|NN SV *sv
1631 Like sv_utf8_upgrade, but doesn't do magic on C<sv>.
1636 /* Let us hope that bitmaps for UV and IV are the same */
1637 #define SvIV(sv) (SvIOK_nog(sv) ? SvIVX(sv) : sv_2iv(sv))
1638 #define SvUV(sv) (SvUOK_nog(sv) ? SvUVX(sv) : sv_2uv(sv))
1639 #define SvNV(sv) (SvNOK_nog(sv) ? SvNVX(sv) : sv_2nv(sv))
1641 #define SvIV_nomg(sv) (SvIOK(sv) ? SvIVX(sv) : sv_2iv_flags(sv, 0))
1642 #define SvUV_nomg(sv) (SvIOK(sv) ? SvUVX(sv) : sv_2uv_flags(sv, 0))
1643 #define SvNV_nomg(sv) (SvNOK(sv) ? SvNVX(sv) : sv_2nv_flags(sv, 0))
1647 #define SvPV(sv, lp) SvPV_flags(sv, lp, SV_GMAGIC)
1648 #define SvPV_const(sv, lp) SvPV_flags_const(sv, lp, SV_GMAGIC)
1649 #define SvPV_mutable(sv, lp) SvPV_flags_mutable(sv, lp, SV_GMAGIC)
1651 #define SvPV_flags(sv, lp, flags) \
1653 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pv_flags(sv, &lp, flags))
1654 #define SvPV_flags_const(sv, lp, flags) \
1656 ? ((lp = SvCUR(sv)), SvPVX_const(sv)) : \
1657 (const char*) sv_2pv_flags(sv, &lp, (flags|SV_CONST_RETURN)))
1658 #define SvPV_flags_const_nolen(sv, flags) \
1660 ? SvPVX_const(sv) : \
1661 (const char*) sv_2pv_flags(sv, 0, (flags|SV_CONST_RETURN)))
1662 #define SvPV_flags_mutable(sv, lp, flags) \
1664 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) : \
1665 sv_2pv_flags(sv, &lp, (flags|SV_MUTABLE_RETURN)))
1667 #define SvPV_force(sv, lp) SvPV_force_flags(sv, lp, SV_GMAGIC)
1668 #define SvPV_force_nolen(sv) SvPV_force_flags_nolen(sv, SV_GMAGIC)
1669 #define SvPV_force_mutable(sv, lp) SvPV_force_flags_mutable(sv, lp, SV_GMAGIC)
1671 #define SvPV_force_nomg(sv, lp) SvPV_force_flags(sv, lp, 0)
1672 #define SvPV_force_nomg_nolen(sv) SvPV_force_flags_nolen(sv, 0)
1674 #define SvPV_force_flags(sv, lp, flags) \
1675 (SvPOK_pure_nogthink(sv) \
1676 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvn_force_flags(sv, &lp, flags))
1678 #define SvPV_force_flags_nolen(sv, flags) \
1679 (SvPOK_pure_nogthink(sv) \
1680 ? SvPVX(sv) : sv_pvn_force_flags(sv, 0, flags))
1682 #define SvPV_force_flags_mutable(sv, lp, flags) \
1683 (SvPOK_pure_nogthink(sv) \
1684 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) \
1685 : sv_pvn_force_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1687 #define SvPV_nolen(sv) \
1689 ? SvPVX(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC))
1691 /* "_nomg" in these defines means no mg_get() */
1692 #define SvPV_nomg_nolen(sv) \
1694 ? SvPVX(sv) : sv_2pv_flags(sv, 0, 0))
1696 #define SvPV_nolen_const(sv) \
1698 ? SvPVX_const(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC|SV_CONST_RETURN))
1700 #define SvPV_nomg(sv, lp) SvPV_flags(sv, lp, 0)
1701 #define SvPV_nomg_const(sv, lp) SvPV_flags_const(sv, lp, 0)
1702 #define SvPV_nomg_const_nolen(sv) SvPV_flags_const_nolen(sv, 0)
1706 #define SvPVutf8(sv, lp) \
1707 (SvPOK_utf8_nog(sv) \
1708 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvutf8(sv, &lp))
1710 #define SvPVutf8_force(sv, lp) \
1711 (SvPOK_utf8_pure_nogthink(sv) \
1712 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvutf8n_force(sv, &lp))
1714 #define SvPVutf8_nolen(sv) \
1715 (SvPOK_utf8_nog(sv) \
1716 ? SvPVX(sv) : sv_2pvutf8(sv, 0))
1720 #define SvPVbyte(sv, lp) \
1721 (SvPOK_byte_nog(sv) \
1722 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvbyte(sv, &lp))
1724 #define SvPVbyte_force(sv, lp) \
1725 (SvPOK_byte_pure_nogthink(sv) \
1726 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvbyten_force(sv, &lp))
1728 #define SvPVbyte_nolen(sv) \
1729 (SvPOK_byte_nog(sv) \
1730 ? SvPVX(sv) : sv_2pvbyte(sv, 0))
1733 /* define FOOx(): idempotent versions of FOO(). If possible, use a local
1734 * var to evaluate the arg once; failing that, use a global if possible;
1735 * failing that, call a function to do the work
1738 #define SvPVx_force(sv, lp) sv_pvn_force(sv, &lp)
1739 #define SvPVutf8x_force(sv, lp) sv_pvutf8n_force(sv, &lp)
1740 #define SvPVbytex_force(sv, lp) sv_pvbyten_force(sv, &lp)
1742 #define SvTRUE(sv) (LIKELY(sv) && (UNLIKELY(SvGMAGICAL(sv)) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv))))
1743 #define SvTRUE_nomg(sv) (LIKELY(sv) && ( SvTRUE_common(sv, sv_2bool_nomg(sv))))
1744 #define SvTRUE_NN(sv) (UNLIKELY(SvGMAGICAL(sv)) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv)))
1745 #define SvTRUE_nomg_NN(sv) ( SvTRUE_common(sv, sv_2bool_nomg(sv)))
1746 #define SvTRUE_common(sv,fallback) ( \
1751 : (SvFLAGS(sv) & (SVf_IOK|SVf_NOK)) \
1752 ? ( (SvIOK(sv) && SvIVX(sv) != 0) \
1753 || (SvNOK(sv) && SvNVX(sv) != 0.0)) \
1756 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1758 # define SvIVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvIV(_sv); })
1759 # define SvUVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvUV(_sv); })
1760 # define SvNVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvNV(_sv); })
1761 # define SvPVx(sv, lp) ({SV *_sv = (sv); SvPV(_sv, lp); })
1762 # define SvPVx_const(sv, lp) ({SV *_sv = (sv); SvPV_const(_sv, lp); })
1763 # define SvPVx_nolen(sv) ({SV *_sv = (sv); SvPV_nolen(_sv); })
1764 # define SvPVx_nolen_const(sv) ({SV *_sv = (sv); SvPV_nolen_const(_sv); })
1765 # define SvPVutf8x(sv, lp) ({SV *_sv = (sv); SvPVutf8(_sv, lp); })
1766 # define SvPVbytex(sv, lp) ({SV *_sv = (sv); SvPVbyte(_sv, lp); })
1767 # define SvPVbytex_nolen(sv) ({SV *_sv = (sv); SvPVbyte_nolen(_sv); })
1768 # define SvTRUEx(sv) ({SV *_sv = (sv); SvTRUE(_sv); })
1769 # define SvTRUEx_nomg(sv) ({SV *_sv = (sv); SvTRUE_nomg(_sv); })
1771 #else /* __GNUC__ */
1773 /* These inlined macros use globals, which will require a thread
1774 * declaration in user code, so we avoid them under threads */
1776 # define SvIVx(sv) ((PL_Sv = (sv)), SvIV(PL_Sv))
1777 # define SvUVx(sv) ((PL_Sv = (sv)), SvUV(PL_Sv))
1778 # define SvNVx(sv) ((PL_Sv = (sv)), SvNV(PL_Sv))
1779 # define SvPVx(sv, lp) ((PL_Sv = (sv)), SvPV(PL_Sv, lp))
1780 # define SvPVx_const(sv, lp) ((PL_Sv = (sv)), SvPV_const(PL_Sv, lp))
1781 # define SvPVx_nolen(sv) ((PL_Sv = (sv)), SvPV_nolen(PL_Sv))
1782 # define SvPVx_nolen_const(sv) ((PL_Sv = (sv)), SvPV_nolen_const(PL_Sv))
1783 # define SvPVutf8x(sv, lp) ((PL_Sv = (sv)), SvPVutf8(PL_Sv, lp))
1784 # define SvPVbytex(sv, lp) ((PL_Sv = (sv)), SvPVbyte(PL_Sv, lp))
1785 # define SvPVbytex_nolen(sv) ((PL_Sv = (sv)), SvPVbyte_nolen(PL_Sv))
1786 # define SvTRUEx(sv) ((PL_Sv = (sv)), SvTRUE(PL_Sv))
1787 # define SvTRUEx_nomg(sv) ((PL_Sv = (sv)), SvTRUE_nomg(PL_Sv))
1788 #endif /* __GNU__ */
1790 #define SvPVXtrue(sv) ( \
1791 ((XPV*)SvANY((sv))) \
1793 ((XPV*)SvANY((sv)))->xpv_cur > 1 \
1795 ((XPV*)SvANY((sv)))->xpv_cur \
1796 && *(sv)->sv_u.svu_pv != '0' \
1801 #define SvIsCOW(sv) (SvFLAGS(sv) & SVf_IsCOW)
1802 #define SvIsCOW_on(sv) (SvFLAGS(sv) |= SVf_IsCOW)
1803 #define SvIsCOW_off(sv) (SvFLAGS(sv) &= ~SVf_IsCOW)
1804 #define SvIsCOW_shared_hash(sv) (SvIsCOW(sv) && SvLEN(sv) == 0)
1806 #define SvSHARED_HEK_FROM_PV(pvx) \
1807 ((struct hek*)(pvx - STRUCT_OFFSET(struct hek, hek_key)))
1808 #define SvSHARED_HASH(sv) (0 + SvSHARED_HEK_FROM_PV(SvPVX_const(sv))->hek_hash)
1810 /* flag values for sv_*_flags functions */
1811 #define SV_IMMEDIATE_UNREF 1
1813 #define SV_COW_DROP_PV 4
1814 #define SV_UTF8_NO_ENCODING 8
1815 #define SV_NOSTEAL 16
1816 #define SV_CONST_RETURN 32
1817 #define SV_MUTABLE_RETURN 64
1818 #define SV_SMAGIC 128
1819 #define SV_HAS_TRAILING_NUL 256
1820 #define SV_COW_SHARED_HASH_KEYS 512
1821 /* This one is only enabled for PERL_OLD_COPY_ON_WRITE */
1822 #define SV_COW_OTHER_PVS 1024
1823 /* Make sv_2pv_flags return NULL if something is undefined. */
1824 #define SV_UNDEF_RETURNS_NULL 2048
1825 /* Tell sv_utf8_upgrade() to not check to see if an upgrade is really needed.
1826 * This is used when the caller has already determined it is, and avoids
1828 #define SV_FORCE_UTF8_UPGRADE 4096
1829 /* if (after resolving magic etc), the SV is found to be overloaded,
1830 * don't call the overload magic, just return as-is */
1831 #define SV_SKIP_OVERLOAD 8192
1832 #define SV_CATBYTES 16384
1833 #define SV_CATUTF8 32768
1835 /* The core is safe for this COW optimisation. XS code on CPAN may not be.
1836 So only default to doing the COW setup if we're in the core.
1839 # ifndef SV_DO_COW_SVSETSV
1840 # define SV_DO_COW_SVSETSV SV_COW_SHARED_HASH_KEYS|SV_COW_OTHER_PVS
1844 #ifndef SV_DO_COW_SVSETSV
1845 # define SV_DO_COW_SVSETSV 0
1849 #define sv_unref(sv) sv_unref_flags(sv, 0)
1850 #define sv_force_normal(sv) sv_force_normal_flags(sv, 0)
1851 #define sv_usepvn(sv, p, l) sv_usepvn_flags(sv, p, l, 0)
1852 #define sv_usepvn_mg(sv, p, l) sv_usepvn_flags(sv, p, l, SV_SMAGIC)
1854 /* We are about to replace the SV's current value. So if it's copy on write
1855 we need to normalise it. Use the SV_COW_DROP_PV flag hint to say that
1856 the value is about to get thrown away, so drop the PV rather than go to
1857 the effort of making a read-write copy only for it to get immediately
1860 #define SV_CHECK_THINKFIRST_COW_DROP(sv) if (SvTHINKFIRST(sv)) \
1861 sv_force_normal_flags(sv, SV_COW_DROP_PV)
1863 #ifdef PERL_OLD_COPY_ON_WRITE
1864 #define SvRELEASE_IVX(sv) \
1865 ((SvIsCOW(sv) ? sv_force_normal_flags(sv, 0) : (void) 0), 0)
1866 # define SvIsCOW_normal(sv) (SvIsCOW(sv) && SvLEN(sv))
1867 # define SvRELEASE_IVX_(sv) SvRELEASE_IVX(sv),
1868 # define SvCANCOW(sv) \
1869 (SvIsCOW(sv) || (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS)
1870 /* This is a pessimistic view. Scalar must be purely a read-write PV to copy-
1872 # define CAN_COW_MASK (SVs_OBJECT|SVs_GMG|SVs_SMG|SVs_RMG|SVf_IOK|SVf_NOK| \
1873 SVf_POK|SVf_ROK|SVp_IOK|SVp_NOK|SVp_POK|SVf_FAKE| \
1874 SVf_OOK|SVf_BREAK|SVf_READONLY|SVf_PROTECT)
1876 # define SvRELEASE_IVX(sv) 0
1877 /* This little game brought to you by the need to shut this warning up:
1878 mg.c: In function 'Perl_magic_get':
1879 mg.c:1024: warning: left-hand operand of comma expression has no effect
1881 # define SvRELEASE_IVX_(sv) /**/
1882 # ifdef PERL_NEW_COPY_ON_WRITE
1883 # define SvCANCOW(sv) \
1885 ? SvLEN(sv) ? CowREFCNT(sv) != SV_COW_REFCNT_MAX : 1 \
1886 : (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS \
1887 && SvCUR(sv)+1 < SvLEN(sv))
1888 /* Note: To allow 256 COW "copies", a refcnt of 0 means 1. */
1889 # define CowREFCNT(sv) (*(U8 *)(SvPVX(sv)+SvLEN(sv)-1))
1890 # define SV_COW_REFCNT_MAX ((1 << sizeof(U8)*8) - 1)
1891 # define CAN_COW_MASK (SVf_POK|SVf_ROK|SVp_POK|SVf_FAKE| \
1892 SVf_OOK|SVf_BREAK|SVf_READONLY|SVf_PROTECT)
1894 #endif /* PERL_OLD_COPY_ON_WRITE */
1896 #define CAN_COW_FLAGS (SVp_POK|SVf_POK)
1898 #define SV_CHECK_THINKFIRST(sv) if (SvTHINKFIRST(sv)) \
1899 sv_force_normal_flags(sv, 0)
1902 /* all these 'functions' are now just macros */
1904 #define sv_pv(sv) SvPV_nolen(sv)
1905 #define sv_pvutf8(sv) SvPVutf8_nolen(sv)
1906 #define sv_pvbyte(sv) SvPVbyte_nolen(sv)
1908 #define sv_pvn_force_nomg(sv, lp) sv_pvn_force_flags(sv, lp, 0)
1909 #define sv_utf8_upgrade_flags(sv, flags) sv_utf8_upgrade_flags_grow(sv, flags, 0)
1910 #define sv_utf8_upgrade_nomg(sv) sv_utf8_upgrade_flags(sv, 0)
1911 #define sv_catpvn_nomg(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, 0)
1912 #define sv_catpv_nomg(dsv, sstr) sv_catpv_flags(dsv, sstr, 0)
1913 #define sv_setsv(dsv, ssv) \
1914 sv_setsv_flags(dsv, ssv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1915 #define sv_setsv_nomg(dsv, ssv) sv_setsv_flags(dsv, ssv, SV_DO_COW_SVSETSV)
1916 #define sv_catsv(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC)
1917 #define sv_catsv_nomg(dsv, ssv) sv_catsv_flags(dsv, ssv, 0)
1918 #define sv_catsv_mg(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC|SV_SMAGIC)
1919 #define sv_catpvn(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, SV_GMAGIC)
1920 #define sv_catpvn_mg(sv, sstr, slen) sv_catpvn_flags(sv, sstr, slen, SV_GMAGIC|SV_SMAGIC);
1921 #define sv_copypv(dsv, ssv) sv_copypv_flags(dsv, ssv, SV_GMAGIC)
1922 #define sv_copypv_nomg(dsv, ssv) sv_copypv_flags(dsv, ssv, 0)
1923 #define sv_2pv(sv, lp) sv_2pv_flags(sv, lp, SV_GMAGIC)
1924 #define sv_2pv_nolen(sv) sv_2pv(sv, 0)
1925 #define sv_2pvbyte_nolen(sv) sv_2pvbyte(sv, 0)
1926 #define sv_2pvutf8_nolen(sv) sv_2pvutf8(sv, 0)
1927 #define sv_2pv_nomg(sv, lp) sv_2pv_flags(sv, lp, 0)
1928 #define sv_pvn_force(sv, lp) sv_pvn_force_flags(sv, lp, SV_GMAGIC)
1929 #define sv_utf8_upgrade(sv) sv_utf8_upgrade_flags(sv, SV_GMAGIC)
1930 #define sv_2iv(sv) sv_2iv_flags(sv, SV_GMAGIC)
1931 #define sv_2uv(sv) sv_2uv_flags(sv, SV_GMAGIC)
1932 #define sv_2nv(sv) sv_2nv_flags(sv, SV_GMAGIC)
1933 #define sv_eq(sv1, sv2) sv_eq_flags(sv1, sv2, SV_GMAGIC)
1934 #define sv_cmp(sv1, sv2) sv_cmp_flags(sv1, sv2, SV_GMAGIC)
1935 #define sv_cmp_locale(sv1, sv2) sv_cmp_locale_flags(sv1, sv2, SV_GMAGIC)
1936 #define sv_collxfrm(sv, nxp) sv_cmp_flags(sv, nxp, SV_GMAGIC)
1937 #define sv_2bool(sv) sv_2bool_flags(sv, SV_GMAGIC)
1938 #define sv_2bool_nomg(sv) sv_2bool_flags(sv, 0)
1939 #define sv_insert(bigstr, offset, len, little, littlelen) \
1940 Perl_sv_insert_flags(aTHX_ (bigstr),(offset), (len), (little), \
1941 (littlelen), SV_GMAGIC)
1942 #define sv_mortalcopy(sv) \
1943 Perl_sv_mortalcopy_flags(aTHX_ sv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1944 #define sv_cathek(sv,hek) \
1946 HEK * const bmxk = hek; \
1947 sv_catpvn_flags(sv, HEK_KEY(bmxk), HEK_LEN(bmxk), \
1948 HEK_UTF8(bmxk) ? SV_CATUTF8 : SV_CATBYTES); \
1951 /* Should be named SvCatPVN_utf8_upgrade? */
1952 #define sv_catpvn_nomg_utf8_upgrade(dsv, sstr, slen, nsv) \
1955 nsv = newSVpvn_flags(sstr, slen, SVs_TEMP); \
1957 sv_setpvn(nsv, sstr, slen); \
1959 sv_utf8_upgrade(nsv); \
1960 sv_catsv_nomg(dsv, nsv); \
1962 #define sv_catpvn_nomg_maybeutf8(dsv, sstr, slen, is_utf8) \
1963 sv_catpvn_flags(dsv, sstr, slen, (is_utf8)?SV_CATUTF8:SV_CATBYTES)
1965 #if defined(PERL_CORE) || defined(PERL_EXT)
1966 # define sv_or_pv_len_utf8(sv, pv, bytelen) \
1968 ? utf8_length((U8 *)(pv), (U8 *)(pv)+(bytelen)) \
1973 =for apidoc Am|SV*|newRV_inc|SV* sv
1975 Creates an RV wrapper for an SV. The reference count for the original SV is
1981 #define newRV_inc(sv) newRV(sv)
1983 /* the following macros update any magic values this sv is associated with */
1986 =head1 Magical Functions
1988 =for apidoc Am|void|SvGETMAGIC|SV* sv
1989 Invokes C<mg_get> on an SV if it has 'get' magic. For example, this
1990 will call C<FETCH> on a tied variable. This macro evaluates its
1991 argument more than once.
1993 =for apidoc Am|void|SvSETMAGIC|SV* sv
1994 Invokes C<mg_set> on an SV if it has 'set' magic. This is necessary
1995 after modifying a scalar, in case it is a magical variable like C<$|>
1996 or a tied variable (it calls C<STORE>). This macro evaluates its
1997 argument more than once.
1999 =for apidoc Am|void|SvSetSV|SV* dsv|SV* ssv
2000 Calls C<sv_setsv> if dsv is not the same as ssv. May evaluate arguments
2001 more than once. Does not handle 'set' magic on the destination SV.
2003 =for apidoc Am|void|SvSetSV_nosteal|SV* dsv|SV* ssv
2004 Calls a non-destructive version of C<sv_setsv> if dsv is not the same as
2005 ssv. May evaluate arguments more than once.
2007 =for apidoc Am|void|SvSetMagicSV|SV* dsv|SV* ssv
2008 Like C<SvSetSV>, but does any set magic required afterwards.
2010 =for apidoc Am|void|SvSetMagicSV_nosteal|SV* dsv|SV* ssv
2011 Like C<SvSetSV_nosteal>, but does any set magic required afterwards.
2013 =for apidoc Am|void|SvSHARE|SV* sv
2014 Arranges for sv to be shared between threads if a suitable module
2017 =for apidoc Am|void|SvLOCK|SV* sv
2018 Arranges for a mutual exclusion lock to be obtained on sv if a suitable module
2021 =for apidoc Am|void|SvUNLOCK|SV* sv
2022 Releases a mutual exclusion lock on sv if a suitable module
2025 =head1 SV Manipulation Functions
2027 =for apidoc Am|char *|SvGROW|SV* sv|STRLEN len
2028 Expands the character buffer in the SV so that it has room for the
2029 indicated number of bytes (remember to reserve space for an extra trailing
2030 C<NUL> character). Calls C<sv_grow> to perform the expansion if necessary.
2031 Returns a pointer to the character
2032 buffer. SV must be of type >= SVt_PV. One
2033 alternative is to call C<sv_grow> if you are not sure of the type of SV.
2038 #define SvSHARE(sv) PL_sharehook(aTHX_ sv)
2039 #define SvLOCK(sv) PL_lockhook(aTHX_ sv)
2040 #define SvUNLOCK(sv) PL_unlockhook(aTHX_ sv)
2041 #define SvDESTROYABLE(sv) PL_destroyhook(aTHX_ sv)
2043 #define SvGETMAGIC(x) ((void)(UNLIKELY(SvGMAGICAL(x)) && mg_get(x)))
2044 #define SvSETMAGIC(x) STMT_START { if (UNLIKELY(SvSMAGICAL(x))) mg_set(x); } STMT_END
2046 #define SvSetSV_and(dst,src,finally) \
2048 if (LIKELY((dst) != (src))) { \
2049 sv_setsv(dst, src); \
2053 #define SvSetSV_nosteal_and(dst,src,finally) \
2055 if (LIKELY((dst) != (src))) { \
2056 sv_setsv_flags(dst, src, SV_GMAGIC | SV_NOSTEAL | SV_DO_COW_SVSETSV); \
2061 #define SvSetSV(dst,src) \
2062 SvSetSV_and(dst,src,/*nothing*/;)
2063 #define SvSetSV_nosteal(dst,src) \
2064 SvSetSV_nosteal_and(dst,src,/*nothing*/;)
2066 #define SvSetMagicSV(dst,src) \
2067 SvSetSV_and(dst,src,SvSETMAGIC(dst))
2068 #define SvSetMagicSV_nosteal(dst,src) \
2069 SvSetSV_nosteal_and(dst,src,SvSETMAGIC(dst))
2072 #if !defined(SKIP_DEBUGGING)
2073 #define SvPEEK(sv) sv_peek(sv)
2075 #define SvPEEK(sv) ""
2078 #define SvIMMORTAL(sv) (SvREADONLY(sv) && ((sv)==&PL_sv_undef || (sv)==&PL_sv_yes || (sv)==&PL_sv_no || (sv)==&PL_sv_placeholder))
2081 /* exercise the immortal resurrection code in sv_free2() */
2082 # define SvREFCNT_IMMORTAL 1000
2084 # define SvREFCNT_IMMORTAL ((~(U32)0)/2)
2088 =for apidoc Am|SV *|boolSV|bool b
2090 Returns a true SV if C<b> is a true value, or a false SV if C<b> is 0.
2092 See also C<PL_sv_yes> and C<PL_sv_no>.
2097 #define boolSV(b) ((b) ? &PL_sv_yes : &PL_sv_no)
2099 #define isGV(sv) (SvTYPE(sv) == SVt_PVGV)
2100 /* If I give every macro argument a different name, then there won't be bugs
2101 where nested macros get confused. Been there, done that. */
2102 #define isGV_with_GP(pwadak) \
2103 (((SvFLAGS(pwadak) & (SVp_POK|SVpgv_GP)) == SVpgv_GP) \
2104 && (SvTYPE(pwadak) == SVt_PVGV || SvTYPE(pwadak) == SVt_PVLV))
2105 #define isGV_with_GP_on(sv) STMT_START { \
2106 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2107 assert (!SvPOKp(sv)); \
2108 assert (!SvIOKp(sv)); \
2109 (SvFLAGS(sv) |= SVpgv_GP); \
2111 #define isGV_with_GP_off(sv) STMT_START { \
2112 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2113 assert (!SvPOKp(sv)); \
2114 assert (!SvIOKp(sv)); \
2115 (SvFLAGS(sv) &= ~SVpgv_GP); \
2117 #define isREGEXP(sv) \
2118 (SvTYPE(sv) == SVt_REGEXP \
2119 || (SvFLAGS(sv) & (SVTYPEMASK|SVp_POK|SVpgv_GP|SVf_FAKE)) \
2120 == (SVt_PVLV|SVf_FAKE))
2124 # define SvGROW(sv,len) \
2125 (SvIsCOW(sv) || SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2127 # define SvGROW(sv,len) (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2129 #define SvGROW_mutable(sv,len) \
2130 (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX_mutable(sv))
2131 #define Sv_Grow sv_grow
2133 #define CLONEf_COPY_STACKS 1
2134 #define CLONEf_KEEP_PTR_TABLE 2
2135 #define CLONEf_CLONE_HOST 4
2136 #define CLONEf_JOIN_IN 8
2138 struct clone_params {
2141 PerlInterpreter *proto_perl;
2142 PerlInterpreter *new_perl;
2147 =for apidoc Am|SV*|newSVpvn_utf8|NULLOK const char* s|STRLEN len|U32 utf8
2149 Creates a new SV and copies a string (which may contain C<NUL> (C<\0>)
2150 characters) into it. If utf8 is true, calls
2151 C<SvUTF8_on> on the new SV. Implemented as a wrapper around C<newSVpvn_flags>.
2156 #define newSVpvn_utf8(s, len, u) newSVpvn_flags((s), (len), (u) ? SVf_UTF8 : 0)
2159 =for apidoc Amx|SV*|newSVpadname|PADNAME *pn
2161 Creates a new SV containing the pad name.
2166 #define newSVpadname(pn) newSVpvn_utf8(PadnamePV(pn), PadnameLEN(pn), TRUE)
2169 =for apidoc Am|void|SvOOK_offset|NN SV*sv|STRLEN len
2171 Reads into I<len> the offset from SvPVX back to the true start of the
2172 allocated buffer, which will be non-zero if C<sv_chop> has been used to
2173 efficiently remove characters from start of the buffer. Implemented as a
2174 macro, which takes the address of I<len>, which must be of type C<STRLEN>.
2175 Evaluates I<sv> more than once. Sets I<len> to 0 if C<SvOOK(sv)> is false.
2181 /* Does the bot know something I don't?
2182 10:28 <@Nicholas> metabatman
2183 10:28 <+meta> Nicholas: crash
2185 # define SvOOK_offset(sv, offset) STMT_START { \
2186 assert(sizeof(offset) == sizeof(STRLEN)); \
2188 const U8 *_crash = (U8*)SvPVX_const(sv); \
2189 (offset) = *--_crash; \
2191 _crash -= sizeof(STRLEN); \
2192 Copy(_crash, (U8 *)&(offset), sizeof(STRLEN), U8); \
2195 /* Validate the preceding buffer's sentinels to \
2196 verify that no-one is using it. */ \
2197 const U8 *const _bonk = (U8*)SvPVX_const(sv) - (offset);\
2198 while (_crash > _bonk) { \
2200 assert (*_crash == (U8)PTR2UV(_crash)); \
2208 /* This is the same code, but avoids using any temporary variables: */
2209 # define SvOOK_offset(sv, offset) STMT_START { \
2210 assert(sizeof(offset) == sizeof(STRLEN)); \
2212 (offset) = ((U8*)SvPVX_const(sv))[-1]; \
2214 Copy(SvPVX_const(sv) - 1 - sizeof(STRLEN), \
2215 (U8*)&(offset), sizeof(STRLEN), U8); \
2223 #define newIO() MUTABLE_IO(newSV_type(SVt_PVIO))
2225 #define SV_CONST(name) \
2226 PL_sv_consts[SV_CONST_##name] \
2227 ? PL_sv_consts[SV_CONST_##name] \
2228 : (PL_sv_consts[SV_CONST_##name] = newSVpv_share(#name, 0))
2230 #define SV_CONST_TIESCALAR 0
2231 #define SV_CONST_TIEARRAY 1
2232 #define SV_CONST_TIEHASH 2
2233 #define SV_CONST_TIEHANDLE 3
2235 #define SV_CONST_FETCH 4
2236 #define SV_CONST_FETCHSIZE 5
2237 #define SV_CONST_STORE 6
2238 #define SV_CONST_STORESIZE 7
2239 #define SV_CONST_EXISTS 8
2241 #define SV_CONST_PUSH 9
2242 #define SV_CONST_POP 10
2243 #define SV_CONST_SHIFT 11
2244 #define SV_CONST_UNSHIFT 12
2245 #define SV_CONST_SPLICE 13
2246 #define SV_CONST_EXTEND 14
2248 #define SV_CONST_FIRSTKEY 15
2249 #define SV_CONST_NEXTKEY 16
2250 #define SV_CONST_SCALAR 17
2252 #define SV_CONST_OPEN 18
2253 #define SV_CONST_WRITE 19
2254 #define SV_CONST_PRINT 20
2255 #define SV_CONST_PRINTF 21
2256 #define SV_CONST_READ 22
2257 #define SV_CONST_READLINE 23
2258 #define SV_CONST_GETC 24
2259 #define SV_CONST_SEEK 25
2260 #define SV_CONST_TELL 26
2261 #define SV_CONST_EOF 27
2262 #define SV_CONST_BINMODE 28
2263 #define SV_CONST_FILENO 29
2264 #define SV_CONST_CLOSE 30
2266 #define SV_CONST_DELETE 31
2267 #define SV_CONST_CLEAR 32
2268 #define SV_CONST_UNTIE 33
2269 #define SV_CONST_DESTROY 34
2271 #define SV_CONSTS_COUNT 35
2274 * ex: set ts=8 sts=4 sw=4 et: