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() */
16 =for apidoc_section SV Flags
18 =for apidoc Ay||svtype
19 An enum of flags for Perl types. These are found in the file F<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 C<SVt_PVIO> is for I/O objects, C<SVt_PVFM> for formats, C<SVt_PVCV> for
45 subroutines, C<SVt_PVHV> for hashes and C<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 C<SVt_PVGV> represents a typeglob. If C<!SvFAKE(sv)>, then it is a real,
55 incoercible typeglob. If C<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. C<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. C<SVt_REGEXP> is for regular
61 expressions. C<SVt_INVLIST> is for Perl
62 core internal use only.
64 C<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 C<SVt_PVMG>, with fewer internal fields.
68 C<SVt_NULL> can only hold undef. C<SVt_IV> can hold undef, an integer, or a
69 reference. (C<SVt_RV> is an alias for C<SVt_IV>, which exists for backward
70 compatibility.) C<SVt_NV> can hold any of those or a double. C<SVt_PV> can only
71 hold C<undef> or a string. C<SVt_PVIV> is a superset of C<SVt_PV> and C<SVt_IV>.
72 C<SVt_PVNV> is similar. C<SVt_PVMG> can hold anything C<SVt_PVNV> can hold, but it
73 can, but does not have to, be blessed or magical.
75 =for apidoc AmnU||SVt_NULL
76 Type flag for scalars. See L</svtype>.
78 =for apidoc AmnU||SVt_IV
79 Type flag for scalars. See L</svtype>.
81 =for apidoc AmnU||SVt_NV
82 Type flag for scalars. See L</svtype>.
84 =for apidoc AmnU||SVt_PV
85 Type flag for scalars. See L</svtype>.
87 =for apidoc AmnU||SVt_PVIV
88 Type flag for scalars. See L</svtype>.
90 =for apidoc AmnU||SVt_PVNV
91 Type flag for scalars. See L</svtype>.
93 =for apidoc AmnU||SVt_PVMG
94 Type flag for scalars. See L</svtype>.
96 =for apidoc CmnU||SVt_INVLIST
97 Type flag for scalars. See L<perlapi/svtype>.
99 =for apidoc AmnU||SVt_REGEXP
100 Type flag for regular expressions. See L</svtype>.
102 =for apidoc AmnU||SVt_PVGV
103 Type flag for typeglobs. See L</svtype>.
105 =for apidoc AmnU||SVt_PVLV
106 Type flag for scalars. See L</svtype>.
108 =for apidoc AmnU||SVt_PVAV
109 Type flag for arrays. See L</svtype>.
111 =for apidoc AmnU||SVt_PVHV
112 Type flag for hashes. See L</svtype>.
114 =for apidoc AmnU||SVt_PVCV
115 Type flag for subroutines. See L</svtype>.
117 =for apidoc AmnU||SVt_PVFM
118 Type flag for formats. See L</svtype>.
120 =for apidoc AmnU||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 /* 16-31: Unused, though one should be reserved for a
153 * freed sv, if the other 3 bits below the flags ones
155 SVt_LAST /* keep last in enum. used to size arrays */
158 /* *** any alterations to the SV types above need to be reflected in
159 * SVt_MASK and the various PL_valid_types_* tables. As of this writing those
160 * tables are in perl.h. There are also two affected names tables in dump.c,
161 * one in B.xs, and 'bodies_by_type[]' in sv.c.
163 * The bits that match 0xe0 are CURRENTLY UNUSED
164 * The bits above that are for flags, like SVf_IOK */
166 #define SVt_MASK 0x1f /* smallest bitmask that covers all types */
169 /* Fast Boyer Moore tables are now stored in magic attached to PVMGs */
170 # define SVt_PVBM SVt_PVMG
171 /* Anything wanting to create a reference from clean should ensure that it has
172 a scalar of type SVt_IV now: */
173 # define SVt_RV SVt_IV
176 /* There is collusion here with sv_clear - sv_clear exits early for SVt_NULL
177 so never reaches the clause at the end that uses sv_type_details->body_size
178 to determine whether to call safefree(). Hence body_size can be set
179 non-zero to record the size of HEs, without fear of bogus frees. */
180 #if defined(PERL_IN_HV_C) || defined(PERL_IN_XS_APITEST)
181 #define HE_SVSLOT SVt_NULL
184 # define SVt_FIRST SVt_NULL /* the type of SV that new_SV() in sv.c returns */
187 #define PERL_ARENA_ROOTS_SIZE (SVt_LAST)
189 /* typedefs to eliminate some typing */
190 typedef struct he HE;
191 typedef struct hek HEK;
193 /* Using C's structural equivalence to help emulate C++ inheritance here... */
195 /* start with 2 sv-head building blocks */
196 #define _SV_HEAD(ptrtype) \
197 ptrtype sv_any; /* pointer to body */ \
198 U32 sv_refcnt; /* how many references to us */ \
199 U32 sv_flags /* what we are */
202 # define _NV_BODYLESS_UNION NV svu_nv;
204 # define _NV_BODYLESS_UNION
207 #define _SV_HEAD_UNION \
209 char* svu_pv; /* pointer to malloced string */ \
213 SV* svu_rv; /* pointer to another SV */ \
221 #ifdef DEBUG_LEAKING_SCALARS
222 #define _SV_HEAD_DEBUG ;\
223 PERL_BITFIELD32 sv_debug_optype:9; /* the type of OP that allocated us */ \
224 PERL_BITFIELD32 sv_debug_inpad:1; /* was allocated in a pad for an OP */ \
225 PERL_BITFIELD32 sv_debug_line:16; /* the line where we were allocated */ \
226 UV sv_debug_serial; /* serial number of sv allocation */ \
227 char * sv_debug_file; /* the file where we were allocated */ \
228 SV * sv_debug_parent /* what we were cloned from (ithreads)*/
230 #define _SV_HEAD_DEBUG
233 struct STRUCT_SV { /* struct sv { */
239 _SV_HEAD(XPVGV*); /* pointer to xpvgv body */
244 _SV_HEAD(XPVCV*); /* pointer to xpvcv body */
249 _SV_HEAD(XPVAV*); /* pointer to xpvav body */
254 _SV_HEAD(XPVHV*); /* pointer to xpvhv body */
259 _SV_HEAD(XPVIO*); /* pointer to xpvio body */
264 _SV_HEAD(struct regexp*); /* pointer to regexp body */
269 #undef _SV_HEAD_UNION /* ensure no pollution */
272 =for apidoc_section SV Handling
274 =for apidoc Am|U32|SvREFCNT|SV* sv
275 Returns the value of the object's reference count. Exposed
276 to perl code via Internals::SvREFCNT().
278 =for apidoc SvREFCNT_inc
279 Increments the reference count of the given SV, returning the SV.
281 All of the following C<SvREFCNT_inc>* are optimized versions of
282 C<SvREFCNT_inc>, and can be replaced with C<SvREFCNT_inc>.
284 =for apidoc SvREFCNT_inc_NN
285 Same as C<SvREFCNT_inc>, but can only be used if you know C<sv>
286 is not C<NULL>. Since we don't have to check the NULLness, it's faster
289 =for apidoc SvREFCNT_inc_void
290 Same as C<SvREFCNT_inc>, but can only be used if you don't need the
291 return value. The macro doesn't need to return a meaningful value.
293 =for apidoc Am|void|SvREFCNT_inc_void_NN|SV* sv
294 Same as C<SvREFCNT_inc>, but can only be used if you don't need the return
295 value, and you know that C<sv> is not C<NULL>. The macro doesn't need
296 to return a meaningful value, or check for NULLness, so it's smaller
299 =for apidoc Am|SV*|SvREFCNT_inc_simple|SV* sv
300 Same as C<SvREFCNT_inc>, but can only be used with expressions without side
301 effects. Since we don't have to store a temporary value, it's faster.
303 =for apidoc Am|SV*|SvREFCNT_inc_simple_NN|SV* sv
304 Same as C<SvREFCNT_inc_simple>, but can only be used if you know C<sv>
305 is not C<NULL>. Since we don't have to check the NULLness, it's faster
308 =for apidoc Am|void|SvREFCNT_inc_simple_void|SV* sv
309 Same as C<SvREFCNT_inc_simple>, but can only be used if you don't need the
310 return value. The macro doesn't need to return a meaningful value.
312 =for apidoc Am|void|SvREFCNT_inc_simple_void_NN|SV* sv
313 Same as C<SvREFCNT_inc>, but can only be used if you don't need the return
314 value, and you know that C<sv> is not C<NULL>. The macro doesn't need
315 to return a meaningful value, or check for NULLness, so it's smaller
318 =for apidoc SvREFCNT_dec
319 Decrements the reference count of the given SV. C<sv> may be C<NULL>.
321 =for apidoc SvREFCNT_dec_NN
322 Same as C<SvREFCNT_dec>, but can only be used if you know C<sv>
323 is not C<NULL>. Since we don't have to check the NULLness, it's faster
326 =for apidoc Am|svtype|SvTYPE|SV* sv
327 Returns the type of the SV. See C<L</svtype>>.
329 =for apidoc Am|void|SvUPGRADE|SV* sv|svtype type
330 Used to upgrade an SV to a more complex form. Uses C<sv_upgrade> to
331 perform the upgrade if necessary. See C<L</svtype>>.
336 #define SvANY(sv) (sv)->sv_any
337 #define SvFLAGS(sv) (sv)->sv_flags
338 #define SvREFCNT(sv) (sv)->sv_refcnt
340 #define SvREFCNT_inc(sv) Perl_SvREFCNT_inc(MUTABLE_SV(sv))
341 #define SvREFCNT_inc_simple(sv) SvREFCNT_inc(sv)
342 #define SvREFCNT_inc_NN(sv) Perl_SvREFCNT_inc_NN(MUTABLE_SV(sv))
343 #define SvREFCNT_inc_void(sv) Perl_SvREFCNT_inc_void(MUTABLE_SV(sv))
345 /* These guys don't need the curly blocks */
346 #define SvREFCNT_inc_simple_void(sv) STMT_START { if (sv) SvREFCNT(sv)++; } STMT_END
347 #define SvREFCNT_inc_simple_NN(sv) (++(SvREFCNT(sv)),MUTABLE_SV(sv))
348 #define SvREFCNT_inc_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
349 #define SvREFCNT_inc_simple_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
351 #define SvREFCNT_dec(sv) Perl_SvREFCNT_dec(aTHX_ MUTABLE_SV(sv))
352 #define SvREFCNT_dec_NN(sv) Perl_SvREFCNT_dec_NN(aTHX_ MUTABLE_SV(sv))
354 #define SVTYPEMASK 0xff
355 #define SvTYPE(sv) ((svtype)((sv)->sv_flags & SVTYPEMASK))
357 /* Sadly there are some parts of the core that have pointers to already-freed
358 SV heads, and rely on being able to tell that they are now free. So mark
359 them all by using a consistent macro. */
360 #define SvIS_FREED(sv) UNLIKELY(((sv)->sv_flags == SVTYPEMASK))
362 /* this is defined in this peculiar way to avoid compiler warnings.
363 * See the <20121213131428.GD1842@iabyn.com> thread in p5p */
364 #define SvUPGRADE(sv, mt) \
365 ((void)(SvTYPE(sv) >= (mt) || (sv_upgrade(sv, mt),1)))
367 #define SVf_IOK 0x00000100 /* has valid public integer value */
368 #define SVf_NOK 0x00000200 /* has valid public numeric value */
369 #define SVf_POK 0x00000400 /* has valid public pointer value */
370 #define SVf_ROK 0x00000800 /* has a valid reference pointer */
372 #define SVp_IOK 0x00001000 /* has valid non-public integer value */
373 #define SVp_NOK 0x00002000 /* has valid non-public numeric value */
374 #define SVp_POK 0x00004000 /* has valid non-public pointer value */
375 #define SVp_SCREAM 0x00008000 /* currently unused on plain scalars */
376 #define SVphv_CLONEABLE SVp_SCREAM /* PVHV (stashes) clone its objects */
377 #define SVpgv_GP SVp_SCREAM /* GV has a valid GP */
378 #define SVprv_PCS_IMPORTED SVp_SCREAM /* RV is a proxy for a constant
379 subroutine in another package. Set the
380 GvIMPORTED_CV_on() if it needs to be
381 expanded to a real GV */
383 /* SVf_PROTECT is what SVf_READONLY should have been: i.e. modifying
384 * this SV is completely illegal. However, SVf_READONLY (via
385 * Internals::SvREADONLY()) has come to be seen as a flag that can be
386 * temporarily set and unset by the user to indicate e.g. whether a hash
387 * is "locked". Now, Hash::Util et al only set SVf_READONLY, while core
388 * sets both (SVf_READONLY|SVf_PROTECT) to indicate both to core and user
389 * code that this SV should not be messed with.
391 #define SVf_PROTECT 0x00010000 /* very read-only */
392 #define SVs_PADTMP 0x00020000 /* in use as tmp */
393 #define SVs_PADSTALE 0x00040000 /* lexical has gone out of scope;
394 only used when !PADTMP */
395 #define SVs_TEMP 0x00080000 /* mortal (implies string is stealable) */
396 #define SVs_OBJECT 0x00100000 /* is "blessed" */
397 #define SVs_GMG 0x00200000 /* has magical get method */
398 #define SVs_SMG 0x00400000 /* has magical set method */
399 #define SVs_RMG 0x00800000 /* has random magical methods */
401 #define SVf_FAKE 0x01000000 /* 0: glob is just a copy
402 1: SV head arena wasn't malloc()ed
403 2: For PVCV, whether CvUNIQUE(cv)
404 refers to an eval or once only
405 [CvEVAL(cv), CvSPECIAL(cv)]
406 3: HV: informally reserved by DAPM
408 4: Together with other flags (or
409 lack thereof) indicates a regex,
410 including PVLV-as-regex. See
413 #define SVf_OOK 0x02000000 /* has valid offset value. For a PVHV this
414 means that a hv_aux struct is present
415 after the main array */
416 #define SVf_BREAK 0x04000000 /* refcnt is artificially low - used by
417 SVs in final arena cleanup.
418 Set in S_regtry on PL_reg_curpm, so that
419 perl_destruct will skip it.
420 Used for mark and sweep by OP_AASSIGN
422 #define SVf_READONLY 0x08000000 /* may not be modified */
427 #define SVf_THINKFIRST (SVf_READONLY|SVf_PROTECT|SVf_ROK|SVf_FAKE \
430 #define SVf_OK (SVf_IOK|SVf_NOK|SVf_POK|SVf_ROK| \
431 SVp_IOK|SVp_NOK|SVp_POK|SVpgv_GP)
433 #define PRIVSHIFT 4 /* (SVp_?OK >> PRIVSHIFT) == SVf_?OK */
435 /* SVf_AMAGIC means that the stash *may* have overload methods. It's
436 * set each time a function is compiled into a stash, and is reset by the
437 * overload code when called for the first time and finds that there are
438 * no overload methods. Note that this used to be set on the object; but
439 * is now only set on stashes.
441 #define SVf_AMAGIC 0x10000000 /* has magical overloaded methods */
442 #define SVf_IsCOW 0x10000000 /* copy on write (shared hash key if
445 /* Ensure this value does not clash with the GV_ADD* flags in gv.h, or the
446 CV_CKPROTO_* flags in op.c, or the padadd_* flags in pad.h: */
447 #define SVf_UTF8 0x20000000 /* SvPV is UTF-8 encoded
448 This is also set on RVs whose overloaded
449 stringification is UTF-8. This might
450 only happen as a side effect of SvPV() */
452 #define SVphv_SHAREKEYS 0x20000000 /* PVHV keys live on shared string table */
454 /* PVAV could probably use 0x2000000 without conflict. I assume that PVFM can
455 be UTF-8 encoded, and PVCVs could well have UTF-8 prototypes. PVIOs haven't
456 been restructured, so sometimes get used as string buffers. */
459 /* Some private flags. */
463 #define SVpav_REAL 0x40000000 /* free old entries */
465 #define SVphv_LAZYDEL 0x40000000 /* entry in xhv_eiter must be deleted */
467 /* IV, PVIV, PVNV, PVMG, PVGV and (I assume) PVLV */
468 #define SVf_IVisUV 0x80000000 /* use XPVUV instead of XPVIV */
470 #define SVpav_REIFY 0x80000000 /* can become real */
472 #define SVphv_HASKFLAGS 0x80000000 /* keys have flag byte after hash */
473 /* RV upwards. However, SVf_ROK and SVp_IOK are exclusive */
474 #define SVprv_WEAKREF 0x80000000 /* Weak reference */
475 /* pad name vars only */
478 HV* xmg_stash; /* class package */ \
480 STRLEN xpv_cur; /* length of svu_pv as a C string */ \
482 STRLEN xpvlenu_len; /* allocated size */ \
483 struct regexp* xpvlenu_rx; /* regex when SV body is XPVLV */ \
486 #define xpv_len xpv_len_u.xpvlenu_len
489 NV xnv_nv; /* numeric value, if any */
491 line_t xnv_lines; /* used internally by S_scan_subst() */
492 bool xnv_bm_tail; /* an SvVALID (BM) SV has an implicit "\n" */
496 IV xivu_iv; /* integer value */
498 HEK * xivu_namehek; /* xpvlv, xpvgv: GvNAME */
499 bool xivu_eval_seen; /* used internally by S_scan_subst() */
504 MAGIC* xmg_magic; /* linked list of magicalness */
505 STRLEN xmg_hash_index; /* used while freeing hash entries */
517 #define xiv_iv xiv_u.xivu_iv
524 #define xuv_uv xuv_u.xivu_uv
532 /* This structure must match the beginning of struct xpvhv in hv.h. */
545 SSize_t xlvu_stargoff;
549 char xlv_type; /* k=keys .=pos x=substr v=vec /=join/re
550 * y=alem/helem/iter t=tie T=tied HE */
551 char xlv_flags; /* 1 = negative offset 2 = negative len
552 4 = out of range (vec) */
555 #define xlv_targoff xlv_targoff_u.xlvu_targoff
559 IV prev_index; /* caches result of previous invlist_search() */
560 STRLEN iterator; /* Stores where we are in iterating */
561 bool is_offset; /* The data structure for all inversion lists
562 begins with an element for code point U+0000.
563 If this bool is set, the actual list contains
564 that 0; otherwise, the list actually begins
565 with the following element. Thus to invert
566 the list, merely toggle this flag */
569 /* This structure works in 2 ways - regular scalar, or GV with GP */
577 typedef U32 cv_flags_t;
579 #define _XPVCV_COMMON \
587 void (*xcv_xsub) (pTHX_ CV*); \
595 PADLIST * xcv_padlist; \
599 U32 xcv_outside_seq; /* the COP sequence (at the point of our \
600 * compilation) in the lexically enclosing \
602 cv_flags_t xcv_flags; \
603 I32 xcv_depth /* >= 2 indicates recursive call */
605 /* This structure must match XPVCV in cv.h */
616 /* ifp and ofp are normally the same, but sockets need separate streams */
618 /* Cray addresses everything by word boundaries (64 bits) and
619 * code and data pointers cannot be mixed (which is exactly what
620 * Perl_filter_add() tries to do with the dirp), hence the
621 * following union trick (as suggested by Gurusamy Sarathy).
622 * For further information see Geir Johansen's problem report
623 * titled [ID 20000612.002 (#3366)] Perl problem on Cray system
624 * The any pointer (known as IoANY()) will also be a good place
625 * to hang any IO disciplines to.
628 DIR * xiou_dirp; /* for opendir, readdir, etc */
629 void * xiou_any; /* for alignment */
631 /* IV xio_lines is now in IVX $. */
632 IV xio_page; /* $% */
633 IV xio_page_len; /* $= */
634 IV xio_lines_left; /* $- */
635 char * xio_top_name; /* $^ */
636 GV * xio_top_gv; /* $^ */
637 char * xio_fmt_name; /* $~ */
638 GV * xio_fmt_gv; /* $~ */
639 char * xio_bottom_name;/* $^B */
640 GV * xio_bottom_gv; /* $^B */
645 #define xio_dirp xio_dirpu.xiou_dirp
646 #define xio_any xio_dirpu.xiou_any
648 #define IOf_ARGV 1 /* this fp iterates over ARGV */
649 #define IOf_START 2 /* check for null ARGV and substitute '-' */
650 #define IOf_FLUSH 4 /* this fp wants a flush after write op */
651 #define IOf_DIDTOP 8 /* just did top of form */
652 #define IOf_UNTAINT 16 /* consider this fp (and its data) "safe" */
653 #define IOf_NOLINE 32 /* slurped a pseudo-line from empty file */
654 #define IOf_FAKE_DIRP 64 /* xio_dirp is fake (source filters kludge)
655 Also, when this is set, SvPVX() is valid */
657 /* The following macros define implementation-independent predicates on SVs. */
660 =for apidoc Am|U32|SvNIOK|SV* sv
661 Returns a U32 value indicating whether the SV contains a number, integer or
664 =for apidoc Am|U32|SvNIOKp|SV* sv
665 Returns a U32 value indicating whether the SV contains a number, integer or
666 double. Checks the B<private> setting. Use C<SvNIOK> instead.
668 =for apidoc Am|void|SvNIOK_off|SV* sv
669 Unsets the NV/IV status of an SV.
671 =for apidoc Am|U32|SvOK|SV* sv
672 Returns a U32 value indicating whether the value is defined. This is
673 only meaningful for scalars.
675 =for apidoc Am|U32|SvIOKp|SV* sv
676 Returns a U32 value indicating whether the SV contains an integer. Checks
677 the B<private> setting. Use C<SvIOK> instead.
679 =for apidoc Am|U32|SvNOKp|SV* sv
680 Returns a U32 value indicating whether the SV contains a double. Checks the
681 B<private> setting. Use C<SvNOK> instead.
683 =for apidoc Am|U32|SvPOKp|SV* sv
684 Returns a U32 value indicating whether the SV contains a character string.
685 Checks the B<private> setting. Use C<SvPOK> instead.
687 =for apidoc Am|U32|SvIOK|SV* sv
688 Returns a U32 value indicating whether the SV contains an integer.
690 =for apidoc Am|void|SvIOK_on|SV* sv
691 Tells an SV that it is an integer.
693 =for apidoc Am|void|SvIOK_off|SV* sv
694 Unsets the IV status of an SV.
696 =for apidoc Am|void|SvIOK_only|SV* sv
697 Tells an SV that it is an integer and disables all other C<OK> bits.
699 =for apidoc Am|void|SvIOK_only_UV|SV* sv
700 Tells an SV that it is an unsigned integer and disables all other C<OK> bits.
702 =for apidoc Am|bool|SvIOK_UV|SV* sv
703 Returns a boolean indicating whether the SV contains an integer that must be
704 interpreted as unsigned. A non-negative integer whose value is within the
705 range of both an IV and a UV may be flagged as either C<SvUOK> or C<SvIOK>.
707 =for apidoc Am|bool|SvUOK|SV* sv
708 Returns a boolean indicating whether the SV contains an integer that must be
709 interpreted as unsigned. A non-negative integer whose value is within the
710 range of both an IV and a UV may be flagged as either C<SvUOK> or C<SvIOK>.
712 =for apidoc Am|bool|SvIOK_notUV|SV* sv
713 Returns a boolean indicating whether the SV contains a signed integer.
715 =for apidoc Am|U32|SvNOK|SV* sv
716 Returns a U32 value indicating whether the SV contains a double.
718 =for apidoc Am|void|SvNOK_on|SV* sv
719 Tells an SV that it is a double.
721 =for apidoc Am|void|SvNOK_off|SV* sv
722 Unsets the NV status of an SV.
724 =for apidoc Am|void|SvNOK_only|SV* sv
725 Tells an SV that it is a double and disables all other OK bits.
727 =for apidoc Am|U32|SvPOK|SV* sv
728 Returns a U32 value indicating whether the SV contains a character
731 =for apidoc Am|void|SvPOK_on|SV* sv
732 Tells an SV that it is a string.
734 =for apidoc Am|void|SvPOK_off|SV* sv
735 Unsets the PV status of an SV.
737 =for apidoc Am|void|SvPOK_only|SV* sv
738 Tells an SV that it is a string and disables all other C<OK> bits.
739 Will also turn off the UTF-8 status.
741 =for apidoc Am|bool|SvVOK|SV* sv
742 Returns a boolean indicating whether the SV contains a v-string.
744 =for apidoc Am|U32|SvOOK|SV* sv
745 Returns a U32 indicating whether the pointer to the string buffer is offset.
746 This hack is used internally to speed up removal of characters from the
747 beginning of a C<SvPV>. When C<SvOOK> is true, then the start of the
748 allocated string buffer is actually C<SvOOK_offset()> bytes before C<SvPVX>.
749 This offset used to be stored in C<SvIVX>, but is now stored within the spare
752 =for apidoc Am|U32|SvROK|SV* sv
753 Tests if the SV is an RV.
755 =for apidoc Am|void|SvROK_on|SV* sv
756 Tells an SV that it is an RV.
758 =for apidoc Am|void|SvROK_off|SV* sv
759 Unsets the RV status of an SV.
761 =for apidoc Am|SV*|SvRV|SV* sv
762 Dereferences an RV to return the SV.
764 =for apidoc Am|IV|SvIVX|SV* sv
765 Returns the raw value in the SV's IV slot, without checks or conversions.
766 Only use when you are sure C<SvIOK> is true. See also C<L</SvIV>>.
768 =for apidoc Am|UV|SvUVX|SV* sv
769 Returns the raw value in the SV's UV slot, without checks or conversions.
770 Only use when you are sure C<SvIOK> is true. See also C<L</SvUV>>.
772 =for apidoc AmD|UV|SvUVXx|SV* sv
773 This is an unnecessary synonym for L</SvUVX>
775 =for apidoc Am|NV|SvNVX|SV* sv
776 Returns the raw value in the SV's NV slot, without checks or conversions.
777 Only use when you are sure C<SvNOK> is true. See also C<L</SvNV>>.
779 =for apidoc Am|char*|SvPVX|SV* sv
780 Returns a pointer to the physical string in the SV. The SV must contain a
781 string. Prior to 5.9.3 it is not safe
782 to execute this macro unless the SV's
785 This is also used to store the name of an autoloaded subroutine in an XS
786 AUTOLOAD routine. See L<perlguts/Autoloading with XSUBs>.
788 =for apidoc Am|STRLEN|SvCUR|SV* sv
789 Returns the length of the string which is in the SV. See C<L</SvLEN>>.
791 =for apidoc Am|STRLEN|SvLEN|SV* sv
792 Returns the size of the string buffer in the SV, not including any part
793 attributable to C<SvOOK>. See C<L</SvCUR>>.
795 =for apidoc Am|char*|SvEND|SV* sv
796 Returns a pointer to the spot just after the last character in
797 the string which is in the SV, where there is usually a trailing
798 C<NUL> character (even though Perl scalars do not strictly require it).
799 See C<L</SvCUR>>. Access the character as C<*(SvEND(sv))>.
801 Warning: If C<SvCUR> is equal to C<SvLEN>, then C<SvEND> points to
804 =for apidoc Am|HV*|SvSTASH|SV* sv
805 Returns the stash of the SV.
807 =for apidoc Am|void|SvIV_set|SV* sv|IV val
808 Set the value of the IV pointer in sv to val. It is possible to perform
809 the same function of this macro with an lvalue assignment to C<SvIVX>.
810 With future Perls, however, it will be more efficient to use
811 C<SvIV_set> instead of the lvalue assignment to C<SvIVX>.
813 =for apidoc Am|void|SvNV_set|SV* sv|NV val
814 Set the value of the NV pointer in C<sv> to val. See C<L</SvIV_set>>.
816 =for apidoc Am|void|SvPV_set|SV* sv|char* val
817 This is probably not what you want to use, you probably wanted
818 L</sv_usepvn_flags> or L</sv_setpvn> or L</sv_setpvs>.
820 Set the value of the PV pointer in C<sv> to the Perl allocated
821 C<NUL>-terminated string C<val>. See also C<L</SvIV_set>>.
823 Remember to free the previous PV buffer. There are many things to check.
824 Beware that the existing pointer may be involved in copy-on-write or other
825 mischief, so do C<SvOOK_off(sv)> and use C<sv_force_normal> or
826 C<SvPV_force> (or check the C<SvIsCOW> flag) first to make sure this
827 modification is safe. Then finally, if it is not a COW, call
828 C<L</SvPV_free>> to free the previous PV buffer.
830 =for apidoc Am|void|SvUV_set|SV* sv|UV val
831 Set the value of the UV pointer in C<sv> to val. See C<L</SvIV_set>>.
833 =for apidoc Am|void|SvRV_set|SV* sv|SV* val
834 Set the value of the RV pointer in C<sv> to val. See C<L</SvIV_set>>.
836 =for apidoc Am|void|SvMAGIC_set|SV* sv|MAGIC* val
837 Set the value of the MAGIC pointer in C<sv> to val. See C<L</SvIV_set>>.
839 =for apidoc Am|void|SvSTASH_set|SV* sv|HV* val
840 Set the value of the STASH pointer in C<sv> to val. See C<L</SvIV_set>>.
842 =for apidoc Am|void|SvCUR_set|SV* sv|STRLEN len
843 Set the current length of the string which is in the SV. See C<L</SvCUR>>
846 =for apidoc Am|void|SvLEN_set|SV* sv|STRLEN len
847 Set the size of the string buffer for the SV. See C<L</SvLEN>>.
852 #define SvNIOK(sv) (SvFLAGS(sv) & (SVf_IOK|SVf_NOK))
853 #define SvNIOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK))
854 #define SvNIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK| \
855 SVp_IOK|SVp_NOK|SVf_IVisUV))
857 #define assert_not_ROK(sv) assert_(!SvROK(sv) || !SvRV(sv))
858 #define assert_not_glob(sv) assert_(!isGV_with_GP(sv))
860 #define SvOK(sv) (SvFLAGS(sv) & SVf_OK)
861 #define SvOK_off(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
862 SvFLAGS(sv) &= ~(SVf_OK| \
863 SVf_IVisUV|SVf_UTF8), \
865 #define SvOK_off_exc_UV(sv) (assert_not_ROK(sv) \
866 SvFLAGS(sv) &= ~(SVf_OK| \
870 #define SvOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK))
871 #define SvIOKp(sv) (SvFLAGS(sv) & SVp_IOK)
872 #define SvIOKp_on(sv) (assert_not_glob(sv) \
873 SvFLAGS(sv) |= SVp_IOK)
874 #define SvNOKp(sv) (SvFLAGS(sv) & SVp_NOK)
875 #define SvNOKp_on(sv) (assert_not_glob(sv) SvFLAGS(sv) |= SVp_NOK)
876 #define SvPOKp(sv) (SvFLAGS(sv) & SVp_POK)
877 #define SvPOKp_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
878 SvFLAGS(sv) |= SVp_POK)
880 #define SvIOK(sv) (SvFLAGS(sv) & SVf_IOK)
881 #define SvIOK_on(sv) (assert_not_glob(sv) \
882 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
883 #define SvIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVp_IOK|SVf_IVisUV))
884 #define SvIOK_only(sv) (SvOK_off(sv), \
885 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
886 #define SvIOK_only_UV(sv) (assert_not_glob(sv) SvOK_off_exc_UV(sv), \
887 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
889 #define SvIOK_UV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
890 == (SVf_IOK|SVf_IVisUV))
891 #define SvUOK(sv) SvIOK_UV(sv)
892 #define SvIOK_notUV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
895 #define SvIsUV(sv) (SvFLAGS(sv) & SVf_IVisUV)
896 #define SvIsUV_on(sv) (SvFLAGS(sv) |= SVf_IVisUV)
897 #define SvIsUV_off(sv) (SvFLAGS(sv) &= ~SVf_IVisUV)
899 #define SvNOK(sv) (SvFLAGS(sv) & SVf_NOK)
900 #define SvNOK_on(sv) (assert_not_glob(sv) \
901 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
902 #define SvNOK_off(sv) (SvFLAGS(sv) &= ~(SVf_NOK|SVp_NOK))
903 #define SvNOK_only(sv) (SvOK_off(sv), \
904 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
907 =for apidoc Am|U32|SvUTF8|SV* sv
908 Returns a U32 value indicating the UTF-8 status of an SV. If things are set-up
909 properly, this indicates whether or not the SV contains UTF-8 encoded data.
910 You should use this I<after> a call to C<SvPV()> or one of its variants, in
911 case any call to string overloading updates the internal flag.
913 If you want to take into account the L<bytes> pragma, use C<L</DO_UTF8>>
916 =for apidoc Am|void|SvUTF8_on|SV *sv
917 Turn on the UTF-8 status of an SV (the data is not changed, just the flag).
918 Do not use frivolously.
920 =for apidoc Am|void|SvUTF8_off|SV *sv
921 Unsets the UTF-8 status of an SV (the data is not changed, just the flag).
922 Do not use frivolously.
924 =for apidoc Am|void|SvPOK_only_UTF8|SV* sv
925 Tells an SV that it is a string and disables all other C<OK> bits,
926 and leaves the UTF-8 status as it was.
931 /* Ensure the return value of this macro does not clash with the GV_ADD* flags
933 #define SvUTF8(sv) (SvFLAGS(sv) & SVf_UTF8)
934 #define SvUTF8_on(sv) (SvFLAGS(sv) |= (SVf_UTF8))
935 #define SvUTF8_off(sv) (SvFLAGS(sv) &= ~(SVf_UTF8))
937 #define SvPOK(sv) (SvFLAGS(sv) & SVf_POK)
938 #define SvPOK_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
939 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
940 #define SvPOK_off(sv) (SvFLAGS(sv) &= ~(SVf_POK|SVp_POK))
941 #define SvPOK_only(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
942 SvFLAGS(sv) &= ~(SVf_OK| \
943 SVf_IVisUV|SVf_UTF8), \
944 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
945 #define SvPOK_only_UTF8(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
946 SvFLAGS(sv) &= ~(SVf_OK| \
948 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
950 #define SvVOK(sv) (SvMAGICAL(sv) \
951 && mg_find(sv,PERL_MAGIC_vstring))
953 =for apidoc Am|MAGIC*|SvVSTRING_mg|SV * sv
955 Returns the vstring magic, or NULL if none
959 #define SvVSTRING_mg(sv) (SvMAGICAL(sv) \
960 ? mg_find(sv,PERL_MAGIC_vstring) : NULL)
962 #define SvOOK(sv) (SvFLAGS(sv) & SVf_OOK)
963 #define SvOOK_on(sv) (SvFLAGS(sv) |= SVf_OOK)
967 =for apidoc Am|void|SvOOK_off|SV * sv
969 Remove any string offset.
974 #define SvOOK_off(sv) ((void)(SvOOK(sv) && (sv_backoff(sv),0)))
976 #define SvFAKE(sv) (SvFLAGS(sv) & SVf_FAKE)
977 #define SvFAKE_on(sv) (SvFLAGS(sv) |= SVf_FAKE)
978 #define SvFAKE_off(sv) (SvFLAGS(sv) &= ~SVf_FAKE)
980 #define SvROK(sv) (SvFLAGS(sv) & SVf_ROK)
981 #define SvROK_on(sv) (SvFLAGS(sv) |= SVf_ROK)
982 #define SvROK_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK))
984 #define SvMAGICAL(sv) (SvFLAGS(sv) & (SVs_GMG|SVs_SMG|SVs_RMG))
985 #define SvMAGICAL_on(sv) (SvFLAGS(sv) |= (SVs_GMG|SVs_SMG|SVs_RMG))
986 #define SvMAGICAL_off(sv) (SvFLAGS(sv) &= ~(SVs_GMG|SVs_SMG|SVs_RMG))
988 #define SvGMAGICAL(sv) (SvFLAGS(sv) & SVs_GMG)
989 #define SvGMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_GMG)
990 #define SvGMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_GMG)
992 #define SvSMAGICAL(sv) (SvFLAGS(sv) & SVs_SMG)
993 #define SvSMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_SMG)
994 #define SvSMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_SMG)
996 #define SvRMAGICAL(sv) (SvFLAGS(sv) & SVs_RMG)
997 #define SvRMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_RMG)
998 #define SvRMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_RMG)
1000 #define SvAMAGIC(sv) (SvROK(sv) && SvOBJECT(SvRV(sv)) && \
1001 HvAMAGIC(SvSTASH(SvRV(sv))))
1003 /* To be used on the stashes themselves: */
1004 #define HvAMAGIC(hv) (SvFLAGS(hv) & SVf_AMAGIC)
1005 #define HvAMAGIC_on(hv) (SvFLAGS(hv) |= SVf_AMAGIC)
1006 #define HvAMAGIC_off(hv) (SvFLAGS(hv) &=~ SVf_AMAGIC)
1009 /* "nog" means "doesn't have get magic" */
1010 #define SvPOK_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVs_GMG)) == SVf_POK)
1011 #define SvIOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVs_GMG)) == SVf_IOK)
1012 #define SvUOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
1013 #define SvNOK_nog(sv) ((SvFLAGS(sv) & (SVf_NOK|SVs_GMG)) == SVf_NOK)
1014 #define SvNIOK_nog(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & SVs_GMG))
1016 #define SvPOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
1017 #define SvIOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_THINKFIRST|SVs_GMG)) == SVf_IOK)
1018 #define SvUOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVf_THINKFIRST|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
1019 #define SvNOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_NOK|SVf_THINKFIRST|SVs_GMG)) == SVf_NOK)
1020 #define SvNIOK_nogthink(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & (SVf_THINKFIRST|SVs_GMG)))
1022 #define SvPOK_utf8_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == (SVf_POK|SVf_UTF8))
1023 #define SvPOK_utf8_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
1025 #define SvPOK_byte_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == SVf_POK)
1026 #define SvPOK_byte_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
1028 #define SvPOK_pure_nogthink(sv) \
1029 ((SvFLAGS(sv) & (SVf_POK|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
1030 #define SvPOK_utf8_pure_nogthink(sv) \
1031 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
1032 #define SvPOK_byte_pure_nogthink(sv) \
1033 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
1036 =for apidoc Am|U32|SvGAMAGIC|SV* sv
1038 Returns true if the SV has get magic or
1039 overloading. If either is true then
1040 the scalar is active data, and has the potential to return a new value every
1041 time it is accessed. Hence you must be careful to
1042 only read it once per user logical operation and work
1043 with that returned value. If neither is true then
1044 the scalar's value cannot change unless written to.
1049 #define SvGAMAGIC(sv) (SvGMAGICAL(sv) || SvAMAGIC(sv))
1051 #define Gv_AMG(stash) \
1052 (HvNAME(stash) && Gv_AMupdate(stash,FALSE) \
1054 : (HvAMAGIC_off(stash), 0))
1056 #define SvWEAKREF(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_WEAKREF)) \
1057 == (SVf_ROK|SVprv_WEAKREF))
1058 #define SvWEAKREF_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_WEAKREF))
1059 #define SvWEAKREF_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_WEAKREF))
1061 #define SvPCS_IMPORTED(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_PCS_IMPORTED)) \
1062 == (SVf_ROK|SVprv_PCS_IMPORTED))
1063 #define SvPCS_IMPORTED_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_PCS_IMPORTED))
1064 #define SvPCS_IMPORTED_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_PCS_IMPORTED))
1067 =for apidoc m|U32|SvTHINKFIRST|SV *sv
1069 A quick flag check to see whether an C<sv> should be passed to C<sv_force_normal>
1070 to be "downgraded" before C<SvIVX> or C<SvPVX> can be modified directly.
1072 For example, if your scalar is a reference and you want to modify the C<SvIVX>
1073 slot, you can't just do C<SvROK_off>, as that will leak the referent.
1075 This is used internally by various sv-modifying functions, such as
1076 C<sv_setsv>, C<sv_setiv> and C<sv_pvn_force>.
1078 One case that this does not handle is a gv without SvFAKE set. After
1080 if (SvTHINKFIRST(gv)) sv_force_normal(gv);
1082 it will still be a gv.
1084 C<SvTHINKFIRST> sometimes produces false positives. In those cases
1085 C<sv_force_normal> does nothing.
1090 #define SvTHINKFIRST(sv) (SvFLAGS(sv) & SVf_THINKFIRST)
1093 #define SvPADMY(sv) !(SvFLAGS(sv) & SVs_PADTMP)
1095 # define SvPADMY_on(sv) SvPADTMP_off(sv)
1098 #define SvPADTMP(sv) (SvFLAGS(sv) & (SVs_PADTMP))
1099 #define SvPADSTALE(sv) (SvFLAGS(sv) & (SVs_PADSTALE))
1101 #define SvPADTMP_on(sv) (SvFLAGS(sv) |= SVs_PADTMP)
1102 #define SvPADTMP_off(sv) (SvFLAGS(sv) &= ~SVs_PADTMP)
1103 #define SvPADSTALE_on(sv) Perl_SvPADSTALE_on(MUTABLE_SV(sv))
1104 #define SvPADSTALE_off(sv) Perl_SvPADSTALE_off(MUTABLE_SV(sv))
1106 #define SvTEMP(sv) (SvFLAGS(sv) & SVs_TEMP)
1107 #define SvTEMP_on(sv) (SvFLAGS(sv) |= SVs_TEMP)
1108 #define SvTEMP_off(sv) (SvFLAGS(sv) &= ~SVs_TEMP)
1110 #define SvOBJECT(sv) (SvFLAGS(sv) & SVs_OBJECT)
1111 #define SvOBJECT_on(sv) (SvFLAGS(sv) |= SVs_OBJECT)
1112 #define SvOBJECT_off(sv) (SvFLAGS(sv) &= ~SVs_OBJECT)
1115 =for apidoc Am|U32|SvREADONLY|SV* sv
1116 Returns true if the argument is readonly, otherwise returns false.
1117 Exposed to perl code via Internals::SvREADONLY().
1119 =for apidoc Am|U32|SvREADONLY_on|SV* sv
1120 Mark an object as readonly. Exactly what this means depends on the object
1121 type. Exposed to perl code via Internals::SvREADONLY().
1123 =for apidoc Am|U32|SvREADONLY_off|SV* sv
1124 Mark an object as not-readonly. Exactly what this mean depends on the
1125 object type. Exposed to perl code via Internals::SvREADONLY().
1130 #define SvREADONLY(sv) (SvFLAGS(sv) & (SVf_READONLY|SVf_PROTECT))
1132 # define SvREADONLY_on(sv) (SvFLAGS(sv) |= (SVf_READONLY|SVf_PROTECT))
1133 # define SvREADONLY_off(sv) (SvFLAGS(sv) &=~(SVf_READONLY|SVf_PROTECT))
1135 # define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1136 # define SvREADONLY_off(sv) (SvFLAGS(sv) &= ~SVf_READONLY)
1139 #define SvSCREAM(sv) ((SvFLAGS(sv) & (SVp_SCREAM|SVp_POK)) == (SVp_SCREAM|SVp_POK))
1140 #define SvSCREAM_on(sv) (SvFLAGS(sv) |= SVp_SCREAM)
1141 #define SvSCREAM_off(sv) (SvFLAGS(sv) &= ~SVp_SCREAM)
1144 # define SvCOMPILED(sv) 0
1145 # define SvCOMPILED_on(sv)
1146 # define SvCOMPILED_off(sv)
1150 #if defined (DEBUGGING) && defined(PERL_USE_GCC_BRACE_GROUPS)
1151 # define SvTAIL(sv) ({ const SV *const _svtail = (const SV *)(sv); \
1152 assert(SvTYPE(_svtail) != SVt_PVAV); \
1153 assert(SvTYPE(_svtail) != SVt_PVHV); \
1154 assert(!(SvFLAGS(_svtail) & (SVf_NOK|SVp_NOK))); \
1155 assert(SvVALID(_svtail)); \
1156 ((XPVNV*)SvANY(_svtail))->xnv_u.xnv_bm_tail; \
1159 # define SvTAIL(_svtail) (((XPVNV*)SvANY(_svtail))->xnv_u.xnv_bm_tail)
1162 /* Does the SV have a Boyer-Moore table attached as magic?
1163 * 'VALID' is a poor name, but is kept for historical reasons. */
1164 #define SvVALID(_svvalid) ( \
1166 && SvSMAGICAL(_svvalid) \
1167 && SvMAGIC(_svvalid) \
1168 && (SvMAGIC(_svvalid)->mg_type == PERL_MAGIC_bm \
1169 || mg_find(_svvalid, PERL_MAGIC_bm)) \
1172 #define SvRVx(sv) SvRV(sv)
1174 #ifdef PERL_DEBUG_COW
1175 /* Need -0.0 for SvNVX to preserve IEEE FP "negative zero" because
1176 +0.0 + -0.0 => +0.0 but -0.0 + -0.0 => -0.0 */
1177 # define SvIVX(sv) (0 + ((XPVIV*) SvANY(sv))->xiv_iv)
1178 # define SvUVX(sv) (0 + ((XPVUV*) SvANY(sv))->xuv_uv)
1179 # define SvNVX(sv) (-0.0 + ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv)
1180 # define SvRV(sv) (0 + (sv)->sv_u.svu_rv)
1181 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1182 /* Don't test the core XS code yet. */
1183 # if defined (PERL_CORE) && PERL_DEBUG_COW > 1
1184 # define SvPVX(sv) (0 + (assert_(!SvREADONLY(sv)) (sv)->sv_u.svu_pv))
1186 # define SvPVX(sv) SvPVX_mutable(sv)
1188 # define SvCUR(sv) (0 + ((XPV*) SvANY(sv))->xpv_cur)
1189 # define SvLEN(sv) (0 + ((XPV*) SvANY(sv))->xpv_len)
1190 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1192 # define SvMAGIC(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_u.xmg_magic))
1193 # define SvSTASH(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_stash))
1196 # define SvLEN(sv) (0 + ((XPV*) SvANY(sv))->xpv_len)
1198 # define SvLEN(sv) ((XPV*) SvANY(sv))->xpv_len
1200 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1202 # if defined (DEBUGGING) && defined(PERL_USE_GCC_BRACE_GROUPS)
1203 /* These get expanded inside other macros that already use a variable _sv */
1204 # define SvPVX(sv) \
1205 (*({ SV *const _svpvx = MUTABLE_SV(sv); \
1206 assert(PL_valid_types_PVX[SvTYPE(_svpvx) & SVt_MASK]); \
1207 assert(!isGV_with_GP(_svpvx)); \
1208 assert(!(SvTYPE(_svpvx) == SVt_PVIO \
1209 && !(IoFLAGS(_svpvx) & IOf_FAKE_DIRP))); \
1210 &((_svpvx)->sv_u.svu_pv); \
1213 # define SvCUR(sv) \
1214 ({ const SV *const _svcur = (const SV *)(sv); \
1215 assert(PL_valid_types_PVX[SvTYPE(_svcur) & SVt_MASK]); \
1216 assert(!isGV_with_GP(_svcur)); \
1217 assert(!(SvTYPE(_svcur) == SVt_PVIO \
1218 && !(IoFLAGS(_svcur) & IOf_FAKE_DIRP))); \
1219 (((XPV*) MUTABLE_PTR(SvANY(_svcur)))->xpv_cur); \
1222 # define SvCUR(sv) \
1223 (*({ const SV *const _svcur = (const SV *)(sv); \
1224 assert(PL_valid_types_PVX[SvTYPE(_svcur) & SVt_MASK]); \
1225 assert(!isGV_with_GP(_svcur)); \
1226 assert(!(SvTYPE(_svcur) == SVt_PVIO \
1227 && !(IoFLAGS(_svcur) & IOf_FAKE_DIRP))); \
1228 &(((XPV*) MUTABLE_PTR(SvANY(_svcur)))->xpv_cur); \
1231 # define SvIVX(sv) \
1232 (*({ const SV *const _svivx = (const SV *)(sv); \
1233 assert(PL_valid_types_IVX[SvTYPE(_svivx) & SVt_MASK]); \
1234 assert(!isGV_with_GP(_svivx)); \
1235 &(((XPVIV*) MUTABLE_PTR(SvANY(_svivx)))->xiv_iv); \
1237 # define SvUVX(sv) \
1238 (*({ const SV *const _svuvx = (const SV *)(sv); \
1239 assert(PL_valid_types_IVX[SvTYPE(_svuvx) & SVt_MASK]); \
1240 assert(!isGV_with_GP(_svuvx)); \
1241 &(((XPVUV*) MUTABLE_PTR(SvANY(_svuvx)))->xuv_uv); \
1243 # define SvNVX(sv) \
1244 (*({ const SV *const _svnvx = (const SV *)(sv); \
1245 assert(PL_valid_types_NVX[SvTYPE(_svnvx) & SVt_MASK]); \
1246 assert(!isGV_with_GP(_svnvx)); \
1247 &(((XPVNV*) MUTABLE_PTR(SvANY(_svnvx)))->xnv_u.xnv_nv); \
1250 (*({ SV *const _svrv = MUTABLE_SV(sv); \
1251 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1252 assert(!isGV_with_GP(_svrv)); \
1253 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1254 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1255 &((_svrv)->sv_u.svu_rv); \
1257 # define SvRV_const(sv) \
1258 ({ const SV *const _svrv = (const SV *)(sv); \
1259 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1260 assert(!isGV_with_GP(_svrv)); \
1261 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1262 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1263 (_svrv)->sv_u.svu_rv; \
1265 # define SvMAGIC(sv) \
1266 (*({ const SV *const _svmagic = (const SV *)(sv); \
1267 assert(SvTYPE(_svmagic) >= SVt_PVMG); \
1268 &(((XPVMG*) MUTABLE_PTR(SvANY(_svmagic)))->xmg_u.xmg_magic); \
1270 # define SvSTASH(sv) \
1271 (*({ const SV *const _svstash = (const SV *)(sv); \
1272 assert(SvTYPE(_svstash) >= SVt_PVMG); \
1273 &(((XPVMG*) MUTABLE_PTR(SvANY(_svstash)))->xmg_stash); \
1276 # define SvPVX(sv) ((sv)->sv_u.svu_pv)
1277 # define SvCUR(sv) ((XPV*) SvANY(sv))->xpv_cur
1278 # define SvIVX(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1279 # define SvUVX(sv) ((XPVUV*) SvANY(sv))->xuv_uv
1280 # define SvNVX(sv) ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv
1281 # define SvRV(sv) ((sv)->sv_u.svu_rv)
1282 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1283 # define SvMAGIC(sv) ((XPVMG*) SvANY(sv))->xmg_u.xmg_magic
1284 # define SvSTASH(sv) ((XPVMG*) SvANY(sv))->xmg_stash
1289 /* Given that these two are new, there can't be any existing code using them
1290 * as LVALUEs, so prevent that from happening */
1291 # define SvPVX_mutable(sv) (0 + (sv)->sv_u.svu_pv)
1292 # define SvPVX_const(sv) ((const char*)(0 + (sv)->sv_u.svu_pv))
1294 /* Except for the poison code, which uses & to scribble over the pointer after
1295 free() is called. */
1296 # define SvPVX_mutable(sv) ((sv)->sv_u.svu_pv)
1297 # define SvPVX_const(sv) ((const char*)((sv)->sv_u.svu_pv))
1300 #define SvIVXx(sv) SvIVX(sv)
1301 #define SvUVXx(sv) SvUVX(sv)
1302 #define SvNVXx(sv) SvNVX(sv)
1303 #define SvPVXx(sv) SvPVX(sv)
1304 #define SvLENx(sv) SvLEN(sv)
1305 #define SvENDx(sv) ((PL_Sv = (sv)), SvEND(PL_Sv))
1308 /* Ask a scalar nicely to try to become an IV, if possible.
1309 Not guaranteed to stay returning void */
1310 /* Macro won't actually call sv_2iv if already IOK */
1311 #define SvIV_please(sv) \
1312 STMT_START {if (!SvIOKp(sv) && (SvFLAGS(sv) & (SVf_NOK|SVf_POK))) \
1313 (void) SvIV(sv); } STMT_END
1314 #define SvIV_please_nomg(sv) \
1315 (!(SvFLAGS(sv) & (SVf_IOK|SVp_IOK)) && (SvFLAGS(sv) & (SVf_NOK|SVf_POK)) \
1316 ? (sv_2iv_flags(sv, 0), SvIOK(sv)) \
1318 #define SvIV_set(sv, val) \
1320 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1321 assert(!isGV_with_GP(sv)); \
1322 (((XPVIV*) SvANY(sv))->xiv_iv = (val)); } STMT_END
1323 #define SvNV_set(sv, val) \
1325 assert(PL_valid_types_NV_set[SvTYPE(sv) & SVt_MASK]); \
1326 assert(!isGV_with_GP(sv)); \
1327 (((XPVNV*)SvANY(sv))->xnv_u.xnv_nv = (val)); } STMT_END
1328 #define SvPV_set(sv, val) \
1330 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1331 assert(!isGV_with_GP(sv)); \
1332 assert(!(SvTYPE(sv) == SVt_PVIO \
1333 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1334 ((sv)->sv_u.svu_pv = (val)); } STMT_END
1335 #define SvUV_set(sv, val) \
1337 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1338 assert(!isGV_with_GP(sv)); \
1339 (((XPVUV*)SvANY(sv))->xuv_uv = (val)); } STMT_END
1340 #define SvRV_set(sv, val) \
1342 assert(PL_valid_types_RV[SvTYPE(sv) & SVt_MASK]); \
1343 assert(!isGV_with_GP(sv)); \
1344 assert(!(SvTYPE(sv) == SVt_PVIO \
1345 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1346 ((sv)->sv_u.svu_rv = (val)); } STMT_END
1347 #define SvMAGIC_set(sv, val) \
1348 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1349 (((XPVMG*)SvANY(sv))->xmg_u.xmg_magic = (val)); } STMT_END
1350 #define SvSTASH_set(sv, val) \
1351 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1352 (((XPVMG*) SvANY(sv))->xmg_stash = (val)); } STMT_END
1353 #define SvCUR_set(sv, val) \
1355 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1356 assert(!isGV_with_GP(sv)); \
1357 assert(!(SvTYPE(sv) == SVt_PVIO \
1358 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1359 (((XPV*) SvANY(sv))->xpv_cur = (val)); } STMT_END
1360 #define SvLEN_set(sv, val) \
1362 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1363 assert(!isGV_with_GP(sv)); \
1364 assert(!(SvTYPE(sv) == SVt_PVIO \
1365 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1366 (((XPV*) SvANY(sv))->xpv_len = (val)); } STMT_END
1367 #define SvEND_set(sv, val) \
1368 STMT_START { assert(SvTYPE(sv) >= SVt_PV); \
1369 SvCUR_set(sv, (val) - SvPVX(sv)); } STMT_END
1371 #define SvPV_renew(sv,n) \
1372 STMT_START { SvLEN_set(sv, n); \
1373 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
1374 (char*)saferealloc((Malloc_t)SvPVX(sv), \
1375 (MEM_SIZE)((n))))); \
1378 #define SvPV_shrink_to_cur(sv) STMT_START { \
1379 const STRLEN _lEnGtH = SvCUR(sv) + 1; \
1380 SvPV_renew(sv, _lEnGtH); \
1384 =for apidoc Am|void|SvPV_free|SV * sv
1386 Frees the PV buffer in C<sv>, leaving things in a precarious state, so should
1387 only be used as part of a larger operation
1391 #define SvPV_free(sv) \
1393 assert(SvTYPE(sv) >= SVt_PV); \
1395 assert(!SvROK(sv)); \
1396 if(UNLIKELY(SvOOK(sv))) { \
1398 SvOOK_offset(sv, zok); \
1399 SvPV_set(sv, SvPVX_mutable(sv) - zok); \
1400 SvFLAGS(sv) &= ~SVf_OOK; \
1402 Safefree(SvPVX(sv)); \
1407 /* Code that crops up in three places to take a scalar and ready it to hold
1409 # define prepare_SV_for_RV(sv) \
1411 if (SvTYPE(sv) < SVt_PV && SvTYPE(sv) != SVt_IV) \
1412 sv_upgrade(sv, SVt_IV); \
1413 else if (SvTYPE(sv) >= SVt_PV) { \
1422 # define BmFLAGS(sv) (SvTAIL(sv) ? FBMcf_TAIL : 0)
1425 #if defined (DEBUGGING) && defined(PERL_USE_GCC_BRACE_GROUPS)
1426 # define BmUSEFUL(sv) \
1427 (*({ SV *const _bmuseful = MUTABLE_SV(sv); \
1428 assert(SvTYPE(_bmuseful) >= SVt_PVIV); \
1429 assert(SvVALID(_bmuseful)); \
1430 assert(!SvIOK(_bmuseful)); \
1431 &(((XPVIV*) SvANY(_bmuseful))->xiv_u.xivu_iv); \
1434 # define BmUSEFUL(sv) ((XPVIV*) SvANY(sv))->xiv_u.xivu_iv
1439 # define BmRARE(sv) 0
1440 # define BmPREVIOUS(sv) 0
1443 #define FmLINES(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1445 #define LvTYPE(sv) ((XPVLV*) SvANY(sv))->xlv_type
1446 #define LvTARG(sv) ((XPVLV*) SvANY(sv))->xlv_targ
1447 #define LvTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff
1448 #define LvSTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff_u.xlvu_stargoff
1449 #define LvTARGLEN(sv) ((XPVLV*) SvANY(sv))->xlv_targlen
1450 #define LvFLAGS(sv) ((XPVLV*) SvANY(sv))->xlv_flags
1452 #define LVf_NEG_OFF 0x1
1453 #define LVf_NEG_LEN 0x2
1454 #define LVf_OUT_OF_RANGE 0x4
1456 #define IoIFP(sv) (sv)->sv_u.svu_fp
1457 #define IoOFP(sv) ((XPVIO*) SvANY(sv))->xio_ofp
1458 #define IoDIRP(sv) ((XPVIO*) SvANY(sv))->xio_dirp
1459 #define IoANY(sv) ((XPVIO*) SvANY(sv))->xio_any
1460 #define IoLINES(sv) ((XPVIO*) SvANY(sv))->xiv_u.xivu_iv
1461 #define IoPAGE(sv) ((XPVIO*) SvANY(sv))->xio_page
1462 #define IoPAGE_LEN(sv) ((XPVIO*) SvANY(sv))->xio_page_len
1463 #define IoLINES_LEFT(sv)((XPVIO*) SvANY(sv))->xio_lines_left
1464 #define IoTOP_NAME(sv) ((XPVIO*) SvANY(sv))->xio_top_name
1465 #define IoTOP_GV(sv) ((XPVIO*) SvANY(sv))->xio_top_gv
1466 #define IoFMT_NAME(sv) ((XPVIO*) SvANY(sv))->xio_fmt_name
1467 #define IoFMT_GV(sv) ((XPVIO*) SvANY(sv))->xio_fmt_gv
1468 #define IoBOTTOM_NAME(sv)((XPVIO*) SvANY(sv))->xio_bottom_name
1469 #define IoBOTTOM_GV(sv) ((XPVIO*) SvANY(sv))->xio_bottom_gv
1470 #define IoTYPE(sv) ((XPVIO*) SvANY(sv))->xio_type
1471 #define IoFLAGS(sv) ((XPVIO*) SvANY(sv))->xio_flags
1473 /* IoTYPE(sv) is a single character telling the type of I/O connection. */
1474 #define IoTYPE_RDONLY '<'
1475 #define IoTYPE_WRONLY '>'
1476 #define IoTYPE_RDWR '+'
1477 #define IoTYPE_APPEND 'a'
1478 #define IoTYPE_PIPE '|'
1479 #define IoTYPE_STD '-' /* stdin or stdout */
1480 #define IoTYPE_SOCKET 's'
1481 #define IoTYPE_CLOSED ' '
1482 #define IoTYPE_IMPLICIT 'I' /* stdin or stdout or stderr */
1483 #define IoTYPE_NUMERIC '#' /* fdopen */
1486 =for apidoc Am|bool|SvTAINTED|SV* sv
1487 Checks to see if an SV is tainted. Returns TRUE if it is, FALSE if
1490 =for apidoc Am|void|SvTAINTED_on|SV* sv
1491 Marks an SV as tainted if tainting is enabled.
1493 =for apidoc Am|void|SvTAINTED_off|SV* sv
1494 Untaints an SV. Be I<very> careful with this routine, as it short-circuits
1495 some of Perl's fundamental security features. XS module authors should not
1496 use this function unless they fully understand all the implications of
1497 unconditionally untainting the value. Untainting should be done in the
1498 standard perl fashion, via a carefully crafted regexp, rather than directly
1499 untainting variables.
1501 =for apidoc Am|void|SvTAINT|SV* sv
1502 Taints an SV if tainting is enabled, and if some input to the current
1503 expression is tainted--usually a variable, but possibly also implicit
1504 inputs such as locale settings. C<SvTAINT> propagates that taintedness to
1505 the outputs of an expression in a pessimistic fashion; i.e., without paying
1506 attention to precisely which outputs are influenced by which inputs.
1511 #define sv_taint(sv) sv_magic((sv), NULL, PERL_MAGIC_taint, NULL, 0)
1513 #ifdef NO_TAINT_SUPPORT
1514 # define SvTAINTED(sv) 0
1516 # define SvTAINTED(sv) (SvMAGICAL(sv) && sv_tainted(sv))
1518 #define SvTAINTED_on(sv) STMT_START{ if(UNLIKELY(TAINTING_get)){sv_taint(sv);} }STMT_END
1519 #define SvTAINTED_off(sv) STMT_START{ if(UNLIKELY(TAINTING_get)){sv_untaint(sv);} }STMT_END
1521 #define SvTAINT(sv) \
1523 assert(TAINTING_get || !TAINT_get); \
1524 if (UNLIKELY(TAINT_get)) \
1529 =for apidoc Am|char*|SvPV_force|SV* sv|STRLEN len
1530 Like C<SvPV> but will force the SV into containing a string (C<SvPOK>), and
1531 only a string (C<SvPOK_only>), by hook or by crook. You need force if you are
1532 going to update the C<SvPVX> directly. Processes get magic.
1534 Note that coercing an arbitrary scalar into a plain PV will potentially
1535 strip useful data from it. For example if the SV was C<SvROK>, then the
1536 referent will have its reference count decremented, and the SV itself may
1537 be converted to an C<SvPOK> scalar with a string buffer containing a value
1538 such as C<"ARRAY(0x1234)">.
1540 =for apidoc Am|char*|SvPV_force_nomg|SV* sv|STRLEN len
1541 Like C<SvPV_force>, but doesn't process get magic.
1543 =for apidoc Am|char*|SvPV|SV* sv|STRLEN len
1544 Returns a pointer to the string in the SV, or a stringified form of
1545 the SV if the SV does not contain a string. The SV may cache the
1546 stringified version becoming C<SvPOK>. Handles 'get' magic. The
1547 C<len> variable will be set to the length of the string (this is a macro, so
1548 don't use C<&len>). See also C<L</SvPVx>> for a version which guarantees to
1549 evaluate C<sv> only once.
1551 Note that there is no guarantee that the return value of C<SvPV()> is
1552 equal to C<SvPVX(sv)>, or that C<SvPVX(sv)> contains valid data, or that
1553 successive calls to C<SvPV(sv)> will return the same pointer value each
1554 time. This is due to the way that things like overloading and
1555 Copy-On-Write are handled. In these cases, the return value may point to
1556 a temporary buffer or similar. If you absolutely need the C<SvPVX> field to
1557 be valid (for example, if you intend to write to it), then see
1560 =for apidoc Am|char*|SvPVx|SV* sv|STRLEN len
1561 A version of C<SvPV> which guarantees to evaluate C<sv> only once.
1562 Only use this if C<sv> is an expression with side effects, otherwise use the
1563 more efficient C<SvPV>.
1565 =for apidoc Am|char*|SvPV_nomg|SV* sv|STRLEN len
1566 Like C<SvPV> but doesn't process magic.
1568 =for apidoc Am|char*|SvPV_nolen|SV* sv
1569 Like C<SvPV> but doesn't set a length variable.
1571 =for apidoc Am|char*|SvPV_nomg_nolen|SV* sv
1572 Like C<SvPV_nolen> but doesn't process magic.
1574 =for apidoc Am|IV|SvIV|SV* sv
1575 Coerces the given SV to IV and returns it. The returned value in many
1576 circumstances will get stored in C<sv>'s IV slot, but not in all cases. (Use
1577 C<L</sv_setiv>> to make sure it does).
1579 See C<L</SvIVx>> for a version which guarantees to evaluate C<sv> only once.
1581 =for apidoc Am|IV|SvIV_nomg|SV* sv
1582 Like C<SvIV> but doesn't process magic.
1584 =for apidoc Am|IV|SvIVx|SV* sv
1585 Coerces the given SV to IV and returns it. The returned value in many
1586 circumstances will get stored in C<sv>'s IV slot, but not in all cases. (Use
1587 C<L</sv_setiv>> to make sure it does).
1589 This form guarantees to evaluate C<sv> only once. Only use this if C<sv> is an
1590 expression with side effects, otherwise use the more efficient C<SvIV>.
1592 =for apidoc Am|NV|SvNV|SV* sv
1593 Coerces the given SV to NV and returns it. The returned value in many
1594 circumstances will get stored in C<sv>'s NV slot, but not in all cases. (Use
1595 C<L</sv_setnv>> to make sure it does).
1597 See C<L</SvNVx>> for a version which guarantees to evaluate C<sv> only once.
1599 =for apidoc Am|NV|SvNV_nomg|SV* sv
1600 Like C<SvNV> but doesn't process magic.
1602 =for apidoc Am|NV|SvNVx|SV* sv
1603 Coerces the given SV to NV and returns it. The returned value in many
1604 circumstances will get stored in C<sv>'s NV slot, but not in all cases. (Use
1605 C<L</sv_setnv>> to make sure it does).
1607 This form guarantees to evaluate C<sv> only once. Only use this if C<sv> is an
1608 expression with side effects, otherwise use the more efficient C<SvNV>.
1610 =for apidoc Am|UV|SvUV|SV* sv
1611 Coerces the given SV to UV and returns it. The returned value in many
1612 circumstances will get stored in C<sv>'s UV slot, but not in all cases. (Use
1613 C<L</sv_setuv>> to make sure it does).
1615 See C<L</SvUVx>> for a version which guarantees to evaluate C<sv> only once.
1617 =for apidoc Am|UV|SvUV_nomg|SV* sv
1618 Like C<SvUV> but doesn't process magic.
1620 =for apidoc Am|UV|SvUVx|SV* sv
1621 Coerces the given SV to UV and returns it. The returned value in many
1622 circumstances will get stored in C<sv>'s UV slot, but not in all cases. (Use
1623 C<L</sv_setuv>> to make sure it does).
1625 This form guarantees to evaluate C<sv> only once. Only use this if C<sv> is an
1626 expression with side effects, otherwise use the more efficient C<SvUV>.
1628 =for apidoc Am|bool|SvTRUE|SV* sv
1629 Returns a boolean indicating whether Perl would evaluate the SV as true or
1630 false. See C<L</SvOK>> for a defined/undefined test. Handles 'get' magic
1631 unless the scalar is already C<SvPOK>, C<SvIOK> or C<SvNOK> (the public, not the
1634 As of Perl 5.32, this is guaranteed to evaluate C<sv> only once. Prior to that
1635 release, use C<L</SvTRUEx>> for single evaluation.
1637 =for apidoc Am|bool|SvTRUE_nomg|SV* sv
1638 Returns a boolean indicating whether Perl would evaluate the SV as true or
1639 false. See C<L</SvOK>> for a defined/undefined test. Does not handle 'get' magic.
1641 =for apidoc Am|bool|SvTRUEx|SV* sv
1642 Identical to C<L</SvTRUE>>. Prior to 5.32, they differed in that only this one
1643 was guaranteed to evaluate C<sv> only once; in 5.32 they both evaluated it
1644 once, but C<SvTRUEx> was slightly slower on some platforms; now they are
1647 =for apidoc Am|char*|SvPVutf8_force|SV* sv|STRLEN len
1648 Like C<SvPV_force>, but converts C<sv> to UTF-8 first if necessary.
1650 =for apidoc Am|char*|SvPVutf8|SV* sv|STRLEN len
1651 Like C<SvPV>, but converts C<sv> to UTF-8 first if necessary.
1653 =for apidoc Am|char*|SvPVutf8_nomg|SV* sv|STRLEN len
1654 Like C<SvPVutf8>, but does not process get magic.
1656 =for apidoc Am|char*|SvPVutf8_or_null|SV* sv|STRLEN len
1657 Like C<SvPVutf8>, but when C<sv> is undef, returns C<NULL>.
1659 =for apidoc Am|char*|SvPVutf8_or_null_nomg|SV* sv|STRLEN len
1660 Like C<SvPVutf8_or_null>, but does not process get magic.
1662 =for apidoc Am|char*|SvPVutf8_nolen|SV* sv
1663 Like C<SvPV_nolen>, but converts C<sv> to UTF-8 first if necessary.
1665 =for apidoc Am|char*|SvPVbyte_force|SV* sv|STRLEN len
1666 Like C<SvPV_force>, but converts C<sv> to byte representation first if
1667 necessary. If the SV cannot be downgraded from UTF-8, this croaks.
1669 =for apidoc Am|char*|SvPVbyte|SV* sv|STRLEN len
1670 Like C<SvPV>, but converts C<sv> to byte representation first if necessary. If
1671 the SV cannot be downgraded from UTF-8, this croaks.
1673 =for apidoc Am|char*|SvPVbyte_nomg|SV* sv|STRLEN len
1674 Like C<SvPVbyte>, but does not process get magic.
1676 =for apidoc Am|char*|SvPVbyte_or_null|SV* sv|STRLEN len
1677 Like C<SvPVbyte>, but when C<sv> is undef, returns C<NULL>.
1679 =for apidoc Am|char*|SvPVbyte_or_null_nomg|SV* sv|STRLEN len
1680 Like C<SvPVbyte_or_null>, but does not process get magic.
1682 =for apidoc Am|char*|SvPVbyte_nolen|SV* sv
1683 Like C<SvPV_nolen>, but converts C<sv> to byte representation first if
1684 necessary. If the SV cannot be downgraded from UTF-8, this croaks.
1686 =for apidoc Am|char*|SvPVutf8x_force|SV* sv|STRLEN len
1687 Like C<SvPV_force>, but converts C<sv> to UTF-8 first if necessary.
1688 Guarantees to evaluate C<sv> only once; use the more efficient C<SvPVutf8_force>
1691 =for apidoc Am|char*|SvPVutf8x|SV* sv|STRLEN len
1692 Like C<SvPV>, but converts C<sv> to UTF-8 first if necessary.
1693 Guarantees to evaluate C<sv> only once; use the more efficient C<SvPVutf8>
1696 =for apidoc Am|char*|SvPVbytex_force|SV* sv|STRLEN len
1697 Like C<SvPV_force>, but converts C<sv> to byte representation first if necessary.
1698 Guarantees to evaluate C<sv> only once; use the more efficient C<SvPVbyte_force>
1699 otherwise. If the SV cannot be downgraded from UTF-8, this croaks.
1701 =for apidoc Am|char*|SvPVbytex|SV* sv|STRLEN len
1702 Like C<SvPV>, but converts C<sv> to byte representation first if necessary.
1703 Guarantees to evaluate C<sv> only once; use the more efficient C<SvPVbyte>
1704 otherwise. If the SV cannot be downgraded from UTF-8, this croaks.
1706 =for apidoc Am|U32|SvIsCOW|SV* sv
1707 Returns a U32 value indicating whether the SV is Copy-On-Write (either shared
1708 hash key scalars, or full Copy On Write scalars if 5.9.0 is configured for
1711 =for apidoc Am|bool|SvIsCOW_shared_hash|SV* sv
1712 Returns a boolean indicating whether the SV is Copy-On-Write shared hash key
1715 =for apidoc Am|void|sv_catpvn_nomg|SV* sv|const char* ptr|STRLEN len
1716 Like C<sv_catpvn> but doesn't process magic.
1718 =for apidoc Am|void|sv_catpv_nomg|SV* sv|const char* ptr
1719 Like C<sv_catpv> but doesn't process magic.
1721 =for apidoc Am|void|sv_setsv_nomg|SV* dsv|SV* ssv
1722 Like C<sv_setsv> but doesn't process magic.
1724 =for apidoc Am|void|sv_catsv_nomg|SV* dsv|SV* ssv
1725 Like C<sv_catsv> but doesn't process magic.
1730 /* Let us hope that bitmaps for UV and IV are the same */
1731 #define SvIV(sv) (SvIOK_nog(sv) ? SvIVX(sv) : sv_2iv(sv))
1732 #define SvUV(sv) (SvUOK_nog(sv) ? SvUVX(sv) : sv_2uv(sv))
1733 #define SvNV(sv) (SvNOK_nog(sv) ? SvNVX(sv) : sv_2nv(sv))
1735 #define SvIV_nomg(sv) (SvIOK(sv) ? SvIVX(sv) : sv_2iv_flags(sv, 0))
1736 #define SvUV_nomg(sv) (SvUOK(sv) ? SvUVX(sv) : sv_2uv_flags(sv, 0))
1737 #define SvNV_nomg(sv) (SvNOK(sv) ? SvNVX(sv) : sv_2nv_flags(sv, 0))
1741 #define SvPV(sv, len) SvPV_flags(sv, len, SV_GMAGIC)
1742 #define SvPV_const(sv, len) SvPV_flags_const(sv, len, SV_GMAGIC)
1743 #define SvPV_mutable(sv, len) SvPV_flags_mutable(sv, len, SV_GMAGIC)
1745 #define SvPV_flags(sv, len, flags) \
1747 ? ((len = SvCUR(sv)), SvPVX(sv)) : sv_2pv_flags(sv, &len, flags))
1748 #define SvPV_flags_const(sv, len, flags) \
1750 ? ((len = SvCUR(sv)), SvPVX_const(sv)) : \
1751 (const char*) sv_2pv_flags(sv, &len, (flags|SV_CONST_RETURN)))
1752 #define SvPV_flags_const_nolen(sv, flags) \
1754 ? SvPVX_const(sv) : \
1755 (const char*) sv_2pv_flags(sv, 0, (flags|SV_CONST_RETURN)))
1756 #define SvPV_flags_mutable(sv, len, flags) \
1758 ? ((len = SvCUR(sv)), SvPVX_mutable(sv)) : \
1759 sv_2pv_flags(sv, &len, (flags|SV_MUTABLE_RETURN)))
1761 #define SvPV_force(sv, len) SvPV_force_flags(sv, len, SV_GMAGIC)
1762 #define SvPV_force_nolen(sv) SvPV_force_flags_nolen(sv, SV_GMAGIC)
1763 #define SvPV_force_mutable(sv, len) SvPV_force_flags_mutable(sv, len, SV_GMAGIC)
1765 #define SvPV_force_nomg(sv, len) SvPV_force_flags(sv, len, 0)
1766 #define SvPV_force_nomg_nolen(sv) SvPV_force_flags_nolen(sv, 0)
1768 #define SvPV_force_flags(sv, len, flags) \
1769 (SvPOK_pure_nogthink(sv) \
1770 ? ((len = SvCUR(sv)), SvPVX(sv)) : sv_pvn_force_flags(sv, &len, flags))
1772 #define SvPV_force_flags_nolen(sv, flags) \
1773 (SvPOK_pure_nogthink(sv) \
1774 ? SvPVX(sv) : sv_pvn_force_flags(sv, 0, flags))
1776 #define SvPV_force_flags_mutable(sv, len, flags) \
1777 (SvPOK_pure_nogthink(sv) \
1778 ? ((len = SvCUR(sv)), SvPVX_mutable(sv)) \
1779 : sv_pvn_force_flags(sv, &len, flags|SV_MUTABLE_RETURN))
1781 #define SvPV_nolen(sv) \
1783 ? SvPVX(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC))
1785 /* "_nomg" in these defines means no mg_get() */
1786 #define SvPV_nomg_nolen(sv) \
1788 ? SvPVX(sv) : sv_2pv_flags(sv, 0, 0))
1790 #define SvPV_nolen_const(sv) \
1792 ? SvPVX_const(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC|SV_CONST_RETURN))
1794 #define SvPV_nomg(sv, len) SvPV_flags(sv, len, 0)
1795 #define SvPV_nomg_const(sv, len) SvPV_flags_const(sv, len, 0)
1796 #define SvPV_nomg_const_nolen(sv) SvPV_flags_const_nolen(sv, 0)
1800 #define SvPVutf8(sv, len) \
1801 (SvPOK_utf8_nog(sv) \
1802 ? ((len = SvCUR(sv)), SvPVX(sv)) : sv_2pvutf8(sv, &len))
1804 #define SvPVutf8_or_null(sv, len) \
1805 (SvPOK_utf8_nog(sv) \
1806 ? ((len = SvCUR(sv)), SvPVX(sv)) : (SvGETMAGIC(sv), SvOK(sv)) \
1807 ? sv_2pvutf8_flags(sv, &len, 0) : ((len = 0), NULL))
1809 #define SvPVutf8_nomg(sv, len) \
1810 (SvPOK_utf8_nog(sv) \
1811 ? ((len = SvCUR(sv)), SvPVX(sv)) : sv_2pvutf8_flags(sv, &len, 0))
1813 #define SvPVutf8_or_null_nomg(sv, len) \
1814 (SvPOK_utf8_nog(sv) \
1815 ? ((len = SvCUR(sv)), SvPVX(sv)) : SvOK(sv) \
1816 ? sv_2pvutf8_flags(sv, &len, 0) : ((len = 0), NULL))
1818 #define SvPVutf8_force(sv, len) \
1819 (SvPOK_utf8_pure_nogthink(sv) \
1820 ? ((len = SvCUR(sv)), SvPVX(sv)) : sv_pvutf8n_force(sv, &len))
1822 #define SvPVutf8_nolen(sv) \
1823 (SvPOK_utf8_nog(sv) \
1824 ? SvPVX(sv) : sv_2pvutf8(sv, 0))
1828 #define SvPVbyte(sv, len) \
1829 (SvPOK_byte_nog(sv) \
1830 ? ((len = SvCUR(sv)), SvPVX(sv)) : sv_2pvbyte(sv, &len))
1832 #define SvPVbyte_or_null(sv, len) \
1833 (SvPOK_byte_nog(sv) \
1834 ? ((len = SvCUR(sv)), SvPVX(sv)) : (SvGETMAGIC(sv), SvOK(sv)) \
1835 ? sv_2pvbyte_flags(sv, &len, 0) : ((len = 0), NULL))
1837 #define SvPVbyte_nomg(sv, len) \
1838 (SvPOK_byte_nog(sv) \
1839 ? ((len = SvCUR(sv)), SvPVX(sv)) : sv_2pvbyte_flags(sv, &len, 0))
1841 #define SvPVbyte_or_null_nomg(sv, len) \
1842 (SvPOK_utf8_nog(sv) \
1843 ? ((len = SvCUR(sv)), SvPVX(sv)) : SvOK(sv) \
1844 ? sv_2pvbyte_flags(sv, &len, 0) : ((len = 0), NULL))
1846 #define SvPVbyte_force(sv, len) \
1847 (SvPOK_byte_pure_nogthink(sv) \
1848 ? ((len = SvCUR(sv)), SvPVX(sv)) : sv_pvbyten_force(sv, &len))
1850 #define SvPVbyte_nolen(sv) \
1851 (SvPOK_byte_nog(sv) \
1852 ? SvPVX(sv) : sv_2pvbyte(sv, 0))
1855 /* define FOOx(): idempotent versions of FOO(). If possible, use a local
1856 * var to evaluate the arg once; failing that, use a global if possible;
1857 * failing that, call a function to do the work
1860 #define SvPVx_force(sv, len) sv_pvn_force(sv, &len)
1861 #define SvPVutf8x_force(sv, len) sv_pvutf8n_force(sv, &len)
1862 #define SvPVbytex_force(sv, len) sv_pvbyten_force(sv, &len)
1864 #define SvTRUE(sv) Perl_SvTRUE(aTHX_ sv)
1865 #define SvTRUEx(sv) SvTRUE(sv)
1866 #define SvTRUE_nomg(sv) (LIKELY(sv) && SvTRUE_nomg_NN(sv))
1867 #define SvTRUE_NN(sv) (SvGETMAGIC(sv), SvTRUE_nomg_NN(sv))
1868 #define SvTRUE_nomg_NN(sv) (SvTRUE_common(sv, sv_2bool_nomg(sv)))
1870 #define SvTRUE_common(sv,fallback) ( \
1871 SvIMMORTAL_INTERP(sv) \
1872 ? SvIMMORTAL_TRUE(sv) \
1878 ? (SvIVX(sv) != 0 /* cast to bool */) \
1879 : (SvROK(sv) && !( SvOBJECT(SvRV(sv)) \
1880 && HvAMAGIC(SvSTASH(SvRV(sv))))) \
1884 #if defined(PERL_USE_GCC_BRACE_GROUPS)
1886 # define SvIVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvIV(_sv); })
1887 # define SvUVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvUV(_sv); })
1888 # define SvNVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvNV(_sv); })
1889 # define SvPVx(sv, len) ({SV *_sv = (sv); SvPV(_sv, len); })
1890 # define SvPVx_const(sv, len) ({SV *_sv = (sv); SvPV_const(_sv, len); })
1891 # define SvPVx_nolen(sv) ({SV *_sv = (sv); SvPV_nolen(_sv); })
1892 # define SvPVx_nolen_const(sv) ({SV *_sv = (sv); SvPV_nolen_const(_sv); })
1893 # define SvPVutf8x(sv, len) ({SV *_sv = (sv); SvPVutf8(_sv, len); })
1894 # define SvPVbytex(sv, len) ({SV *_sv = (sv); SvPVbyte(_sv, len); })
1895 # define SvPVbytex_nolen(sv) ({SV *_sv = (sv); SvPVbyte_nolen(_sv); })
1896 # define SvTRUEx_nomg(sv) ({SV *_sv = (sv); SvTRUE_nomg(_sv); })
1898 #else /* __GNUC__ */
1900 /* These inlined macros use globals, which will require a thread
1901 * declaration in user code, so we avoid them under threads */
1903 # define SvIVx(sv) ((PL_Sv = (sv)), SvIV(PL_Sv))
1904 # define SvUVx(sv) ((PL_Sv = (sv)), SvUV(PL_Sv))
1905 # define SvNVx(sv) ((PL_Sv = (sv)), SvNV(PL_Sv))
1906 # define SvPVx(sv, len) ((PL_Sv = (sv)), SvPV(PL_Sv, len))
1907 # define SvPVx_const(sv, len) ((PL_Sv = (sv)), SvPV_const(PL_Sv, len))
1908 # define SvPVx_nolen(sv) ((PL_Sv = (sv)), SvPV_nolen(PL_Sv))
1909 # define SvPVx_nolen_const(sv) ((PL_Sv = (sv)), SvPV_nolen_const(PL_Sv))
1910 # define SvPVutf8x(sv, len) ((PL_Sv = (sv)), SvPVutf8(PL_Sv, len))
1911 # define SvPVbytex(sv, len) ((PL_Sv = (sv)), SvPVbyte(PL_Sv, len))
1912 # define SvPVbytex_nolen(sv) ((PL_Sv = (sv)), SvPVbyte_nolen(PL_Sv))
1913 # define SvTRUEx_nomg(sv) ((PL_Sv = (sv)), SvTRUE_nomg(PL_Sv))
1914 #endif /* __GNU__ */
1916 #define SvPVXtrue(sv) ( \
1917 ((XPV*)SvANY((sv))) \
1919 ((XPV*)SvANY((sv)))->xpv_cur > 1 \
1921 ((XPV*)SvANY((sv)))->xpv_cur \
1922 && *(sv)->sv_u.svu_pv != '0' \
1927 #define SvIsCOW(sv) (SvFLAGS(sv) & SVf_IsCOW)
1928 #define SvIsCOW_on(sv) (SvFLAGS(sv) |= SVf_IsCOW)
1929 #define SvIsCOW_off(sv) (SvFLAGS(sv) &= ~SVf_IsCOW)
1930 #define SvIsCOW_shared_hash(sv) (SvIsCOW(sv) && SvLEN(sv) == 0)
1932 #define SvSHARED_HEK_FROM_PV(pvx) \
1933 ((struct hek*)(pvx - STRUCT_OFFSET(struct hek, hek_key)))
1934 #define SvSHARED_HASH(sv) (0 + SvSHARED_HEK_FROM_PV(SvPVX_const(sv))->hek_hash)
1936 /* flag values for sv_*_flags functions */
1937 #define SV_UTF8_NO_ENCODING 0 /* No longer used */
1940 =for apidoc AmnhD||SV_UTF8_NO_ENCODING
1945 #define SV_IMMEDIATE_UNREF 1
1947 #define SV_COW_DROP_PV 4
1948 #define SV_NOSTEAL 16
1949 #define SV_CONST_RETURN 32
1950 #define SV_MUTABLE_RETURN 64
1951 #define SV_SMAGIC 128
1952 #define SV_HAS_TRAILING_NUL 256
1953 #define SV_COW_SHARED_HASH_KEYS 512
1954 /* This one is only enabled for PERL_OLD_COPY_ON_WRITE */
1955 /* XXX This flag actually enabled for any COW. But it appears not to do
1956 anything. Can we just remove it? Or will it serve some future
1958 #define SV_COW_OTHER_PVS 1024
1959 /* Make sv_2pv_flags return NULL if something is undefined. */
1960 #define SV_UNDEF_RETURNS_NULL 2048
1961 /* Tell sv_utf8_upgrade() to not check to see if an upgrade is really needed.
1962 * This is used when the caller has already determined it is, and avoids
1964 #define SV_FORCE_UTF8_UPGRADE 4096
1965 /* if (after resolving magic etc), the SV is found to be overloaded,
1966 * don't call the overload magic, just return as-is */
1967 #define SV_SKIP_OVERLOAD 8192
1968 #define SV_CATBYTES 16384
1969 #define SV_CATUTF8 32768
1971 /* The core is safe for this COW optimisation. XS code on CPAN may not be.
1972 So only default to doing the COW setup if we're in the core.
1975 # ifndef SV_DO_COW_SVSETSV
1976 # define SV_DO_COW_SVSETSV SV_COW_SHARED_HASH_KEYS|SV_COW_OTHER_PVS
1980 #ifndef SV_DO_COW_SVSETSV
1981 # define SV_DO_COW_SVSETSV 0
1985 #define sv_unref(sv) sv_unref_flags(sv, 0)
1986 #define sv_force_normal(sv) sv_force_normal_flags(sv, 0)
1987 #define sv_usepvn(sv, p, l) sv_usepvn_flags(sv, p, l, 0)
1988 #define sv_usepvn_mg(sv, p, l) sv_usepvn_flags(sv, p, l, SV_SMAGIC)
1990 /* We are about to replace the SV's current value. So if it's copy on write
1991 we need to normalise it. Use the SV_COW_DROP_PV flag hint to say that
1992 the value is about to get thrown away, so drop the PV rather than go to
1993 the effort of making a read-write copy only for it to get immediately
1996 #define SV_CHECK_THINKFIRST_COW_DROP(sv) if (SvTHINKFIRST(sv)) \
1997 sv_force_normal_flags(sv, SV_COW_DROP_PV)
1999 #ifdef PERL_COPY_ON_WRITE
2000 # define SvCANCOW(sv) \
2002 ? SvLEN(sv) ? CowREFCNT(sv) != SV_COW_REFCNT_MAX : 1 \
2003 : (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS \
2004 && SvCUR(sv)+1 < SvLEN(sv))
2005 /* Note: To allow 256 COW "copies", a refcnt of 0 means 1. */
2006 # define CowREFCNT(sv) (*(U8 *)(SvPVX(sv)+SvLEN(sv)-1))
2007 # define SV_COW_REFCNT_MAX nBIT_UMAX(sizeof(U8) * CHARBITS)
2008 # define CAN_COW_MASK (SVf_POK|SVf_ROK|SVp_POK|SVf_FAKE| \
2009 SVf_OOK|SVf_BREAK|SVf_READONLY|SVf_PROTECT)
2012 #define CAN_COW_FLAGS (SVp_POK|SVf_POK)
2014 #define SV_CHECK_THINKFIRST(sv) if (SvTHINKFIRST(sv)) \
2015 sv_force_normal_flags(sv, 0)
2018 /* all these 'functions' are now just macros */
2020 #define sv_pv(sv) SvPV_nolen(sv)
2021 #define sv_pvutf8(sv) SvPVutf8_nolen(sv)
2022 #define sv_pvbyte(sv) SvPVbyte_nolen(sv)
2024 #define sv_pvn_force_nomg(sv, lp) sv_pvn_force_flags(sv, lp, 0)
2025 #define sv_utf8_upgrade_flags(sv, flags) sv_utf8_upgrade_flags_grow(sv, flags, 0)
2026 #define sv_utf8_upgrade_nomg(sv) sv_utf8_upgrade_flags(sv, 0)
2027 #define sv_utf8_downgrade(sv, fail_ok) sv_utf8_downgrade_flags(sv, fail_ok, SV_GMAGIC)
2028 #define sv_utf8_downgrade_nomg(sv, fail_ok) sv_utf8_downgrade_flags(sv, fail_ok, 0)
2029 #define sv_catpvn_nomg(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, 0)
2030 #define sv_catpv_nomg(dsv, sstr) sv_catpv_flags(dsv, sstr, 0)
2031 #define sv_setsv(dsv, ssv) \
2032 sv_setsv_flags(dsv, ssv, SV_GMAGIC|SV_DO_COW_SVSETSV)
2033 #define sv_setsv_nomg(dsv, ssv) sv_setsv_flags(dsv, ssv, SV_DO_COW_SVSETSV)
2034 #define sv_catsv(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC)
2035 #define sv_catsv_nomg(dsv, ssv) sv_catsv_flags(dsv, ssv, 0)
2036 #define sv_catsv_mg(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC|SV_SMAGIC)
2037 #define sv_catpvn(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, SV_GMAGIC)
2038 #define sv_catpvn_mg(sv, sstr, slen) sv_catpvn_flags(sv, sstr, slen, SV_GMAGIC|SV_SMAGIC);
2039 #define sv_copypv(dsv, ssv) sv_copypv_flags(dsv, ssv, SV_GMAGIC)
2040 #define sv_copypv_nomg(dsv, ssv) sv_copypv_flags(dsv, ssv, 0)
2041 #define sv_2pv(sv, lp) sv_2pv_flags(sv, lp, SV_GMAGIC)
2042 #define sv_2pv_nolen(sv) sv_2pv(sv, 0)
2043 #define sv_2pvbyte(sv, lp) sv_2pvbyte_flags(sv, lp, SV_GMAGIC)
2044 #define sv_2pvbyte_nolen(sv) sv_2pvbyte(sv, 0)
2045 #define sv_2pvutf8(sv, lp) sv_2pvutf8_flags(sv, lp, SV_GMAGIC)
2046 #define sv_2pvutf8_nolen(sv) sv_2pvutf8(sv, 0)
2047 #define sv_2pv_nomg(sv, lp) sv_2pv_flags(sv, lp, 0)
2048 #define sv_pvn_force(sv, lp) sv_pvn_force_flags(sv, lp, SV_GMAGIC)
2049 #define sv_utf8_upgrade(sv) sv_utf8_upgrade_flags(sv, SV_GMAGIC)
2050 #define sv_2iv(sv) sv_2iv_flags(sv, SV_GMAGIC)
2051 #define sv_2uv(sv) sv_2uv_flags(sv, SV_GMAGIC)
2052 #define sv_2nv(sv) sv_2nv_flags(sv, SV_GMAGIC)
2053 #define sv_eq(sv1, sv2) sv_eq_flags(sv1, sv2, SV_GMAGIC)
2054 #define sv_cmp(sv1, sv2) sv_cmp_flags(sv1, sv2, SV_GMAGIC)
2055 #define sv_cmp_locale(sv1, sv2) sv_cmp_locale_flags(sv1, sv2, SV_GMAGIC)
2056 #define sv_collxfrm(sv, nxp) sv_collxfrm_flags(sv, nxp, SV_GMAGIC)
2057 #define sv_2bool(sv) sv_2bool_flags(sv, SV_GMAGIC)
2058 #define sv_2bool_nomg(sv) sv_2bool_flags(sv, 0)
2059 #define sv_insert(bigstr, offset, len, little, littlelen) \
2060 Perl_sv_insert_flags(aTHX_ (bigstr),(offset), (len), (little), \
2061 (littlelen), SV_GMAGIC)
2062 #define sv_mortalcopy(sv) \
2063 Perl_sv_mortalcopy_flags(aTHX_ sv, SV_GMAGIC|SV_DO_COW_SVSETSV)
2064 #define sv_cathek(sv,hek) \
2066 HEK * const bmxk = hek; \
2067 sv_catpvn_flags(sv, HEK_KEY(bmxk), HEK_LEN(bmxk), \
2068 HEK_UTF8(bmxk) ? SV_CATUTF8 : SV_CATBYTES); \
2071 /* Should be named SvCatPVN_utf8_upgrade? */
2072 #define sv_catpvn_nomg_utf8_upgrade(dsv, sstr, slen, nsv) \
2075 nsv = newSVpvn_flags(sstr, slen, SVs_TEMP); \
2077 sv_setpvn(nsv, sstr, slen); \
2079 sv_utf8_upgrade(nsv); \
2080 sv_catsv_nomg(dsv, nsv); \
2082 #define sv_catpvn_nomg_maybeutf8(dsv, sstr, slen, is_utf8) \
2083 sv_catpvn_flags(dsv, sstr, slen, (is_utf8)?SV_CATUTF8:SV_CATBYTES)
2085 #if defined(PERL_CORE) || defined(PERL_EXT)
2086 # define sv_or_pv_len_utf8(sv, pv, bytelen) \
2088 ? utf8_length((U8 *)(pv), (U8 *)(pv)+(bytelen)) \
2093 =for apidoc Am|SV*|newRV_inc|SV* sv
2095 Creates an RV wrapper for an SV. The reference count for the original SV is
2101 #define newRV_inc(sv) newRV(sv)
2103 /* the following macros update any magic values this C<sv> is associated with */
2108 =for apidoc Am|void|SvGETMAGIC|SV* sv
2109 Invokes C<L</mg_get>> on an SV if it has 'get' magic. For example, this
2110 will call C<FETCH> on a tied variable. This macro evaluates its
2111 argument more than once.
2113 =for apidoc Am|void|SvSETMAGIC|SV* sv
2114 Invokes C<L</mg_set>> on an SV if it has 'set' magic. This is necessary
2115 after modifying a scalar, in case it is a magical variable like C<$|>
2116 or a tied variable (it calls C<STORE>). This macro evaluates its
2117 argument more than once.
2119 =for apidoc Am|void|SvSetSV|SV* dsv|SV* ssv
2120 Calls C<sv_setsv> if C<dsv> is not the same as C<ssv>. May evaluate arguments
2121 more than once. Does not handle 'set' magic on the destination SV.
2123 =for apidoc Am|void|SvSetSV_nosteal|SV* dsv|SV* ssv
2124 Calls a non-destructive version of C<sv_setsv> if C<dsv> is not the same as
2125 C<ssv>. May evaluate arguments more than once.
2127 =for apidoc Am|void|SvSetMagicSV|SV* dsv|SV* ssv
2128 Like C<SvSetSV>, but does any set magic required afterwards.
2130 =for apidoc Am|void|SvSetMagicSV_nosteal|SV* dsv|SV* ssv
2131 Like C<SvSetSV_nosteal>, but does any set magic required afterwards.
2133 =for apidoc Am|void|SvSHARE|SV* sv
2134 Arranges for C<sv> to be shared between threads if a suitable module
2137 =for apidoc Am|void|SvLOCK|SV* sv
2138 Arranges for a mutual exclusion lock to be obtained on C<sv> if a suitable module
2141 =for apidoc Am|void|SvUNLOCK|SV* sv
2142 Releases a mutual exclusion lock on C<sv> if a suitable module
2145 =for apidoc_section SV Handling
2147 =for apidoc Am|char *|SvGROW|SV* sv|STRLEN len
2148 Expands the character buffer in the SV so that it has room for the
2149 indicated number of bytes (remember to reserve space for an extra trailing
2150 C<NUL> character). Calls C<sv_grow> to perform the expansion if necessary.
2151 Returns a pointer to the character
2152 buffer. SV must be of type >= C<SVt_PV>. One
2153 alternative is to call C<sv_grow> if you are not sure of the type of SV.
2155 You might mistakenly think that C<len> is the number of bytes to add to the
2156 existing size, but instead it is the total size C<sv> should be.
2158 =for apidoc Am|char *|SvPVCLEAR|SV* sv
2159 Ensures that sv is a SVt_PV and that its SvCUR is 0, and that it is
2160 properly null terminated. Equivalent to sv_setpvs(""), but more efficient.
2165 #define SvPVCLEAR(sv) sv_setpv_bufsize(sv,0,0)
2166 #define SvSHARE(sv) PL_sharehook(aTHX_ sv)
2167 #define SvLOCK(sv) PL_lockhook(aTHX_ sv)
2168 #define SvUNLOCK(sv) PL_unlockhook(aTHX_ sv)
2169 #define SvDESTROYABLE(sv) PL_destroyhook(aTHX_ sv)
2171 #define SvGETMAGIC(x) ((void)(UNLIKELY(SvGMAGICAL(x)) && mg_get(x)))
2172 #define SvSETMAGIC(x) STMT_START { if (UNLIKELY(SvSMAGICAL(x))) mg_set(x); } STMT_END
2174 #define SvSetSV_and(dst,src,finally) \
2176 if (LIKELY((dst) != (src))) { \
2177 sv_setsv(dst, src); \
2181 #define SvSetSV_nosteal_and(dst,src,finally) \
2183 if (LIKELY((dst) != (src))) { \
2184 sv_setsv_flags(dst, src, SV_GMAGIC | SV_NOSTEAL | SV_DO_COW_SVSETSV); \
2189 #define SvSetSV(dst,src) \
2190 SvSetSV_and(dst,src,/*nothing*/;)
2191 #define SvSetSV_nosteal(dst,src) \
2192 SvSetSV_nosteal_and(dst,src,/*nothing*/;)
2194 #define SvSetMagicSV(dst,src) \
2195 SvSetSV_and(dst,src,SvSETMAGIC(dst))
2196 #define SvSetMagicSV_nosteal(dst,src) \
2197 SvSetSV_nosteal_and(dst,src,SvSETMAGIC(dst))
2200 #if !defined(SKIP_DEBUGGING)
2201 #define SvPEEK(sv) sv_peek(sv)
2203 #define SvPEEK(sv) ""
2206 /* Is this a per-interpreter immortal SV (rather than global)?
2207 * These should either occupy adjacent entries in the interpreter struct
2208 * (MULTIPLICITY) or adjacent elements of PL_sv_immortals[] otherwise.
2209 * The unsigned (Size_t) cast avoids the need for a second < 0 condition.
2211 #define SvIMMORTAL_INTERP(sv) ((Size_t)((sv) - &PL_sv_yes) < 4)
2213 /* Does this immortal have a true value? Currently only PL_sv_yes does. */
2214 #define SvIMMORTAL_TRUE(sv) ((sv) == &PL_sv_yes)
2216 /* the SvREADONLY() test is to quickly reject most SVs */
2217 #define SvIMMORTAL(sv) \
2219 && (SvIMMORTAL_INTERP(sv) || (sv) == &PL_sv_placeholder))
2222 /* exercise the immortal resurrection code in sv_free2() */
2223 # define SvREFCNT_IMMORTAL 1000
2225 # define SvREFCNT_IMMORTAL ((~(U32)0)/2)
2229 =for apidoc Am|SV *|boolSV|bool b
2231 Returns a true SV if C<b> is a true value, or a false SV if C<b> is 0.
2233 See also C<L</PL_sv_yes>> and C<L</PL_sv_no>>.
2238 #define boolSV(b) ((b) ? &PL_sv_yes : &PL_sv_no)
2240 #define isGV(sv) (SvTYPE(sv) == SVt_PVGV)
2241 /* If I give every macro argument a different name, then there won't be bugs
2242 where nested macros get confused. Been there, done that. */
2243 #define isGV_with_GP(pwadak) \
2244 (((SvFLAGS(pwadak) & (SVp_POK|SVpgv_GP)) == SVpgv_GP) \
2245 && (SvTYPE(pwadak) == SVt_PVGV || SvTYPE(pwadak) == SVt_PVLV))
2246 #define isGV_with_GP_on(sv) STMT_START { \
2247 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2248 assert (!SvPOKp(sv)); \
2249 assert (!SvIOKp(sv)); \
2250 (SvFLAGS(sv) |= SVpgv_GP); \
2252 #define isGV_with_GP_off(sv) STMT_START { \
2253 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2254 assert (!SvPOKp(sv)); \
2255 assert (!SvIOKp(sv)); \
2256 (SvFLAGS(sv) &= ~SVpgv_GP); \
2259 # define isGV_or_RVCV(kadawp) \
2260 (isGV(kadawp) || (SvROK(kadawp) && SvTYPE(SvRV(kadawp)) == SVt_PVCV))
2262 #define isREGEXP(sv) \
2263 (SvTYPE(sv) == SVt_REGEXP \
2264 || (SvFLAGS(sv) & (SVTYPEMASK|SVpgv_GP|SVf_FAKE)) \
2265 == (SVt_PVLV|SVf_FAKE))
2269 # define SvGROW(sv,len) \
2270 (SvIsCOW(sv) || SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2272 # define SvGROW(sv,len) (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2274 #define SvGROW_mutable(sv,len) \
2275 (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX_mutable(sv))
2276 #define Sv_Grow sv_grow
2278 #define CLONEf_COPY_STACKS 1
2279 #define CLONEf_KEEP_PTR_TABLE 2
2280 #define CLONEf_CLONE_HOST 4
2281 #define CLONEf_JOIN_IN 8
2283 struct clone_params {
2286 PerlInterpreter *proto_perl;
2287 PerlInterpreter *new_perl;
2291 /* SV_NOSTEAL prevents TEMP buffers being, well, stolen, and saves games
2292 with SvTEMP_off and SvTEMP_on round a call to sv_setsv. */
2293 #define newSVsv(sv) newSVsv_flags((sv), SV_GMAGIC|SV_NOSTEAL)
2294 #define newSVsv_nomg(sv) newSVsv_flags((sv), SV_NOSTEAL)
2297 =for apidoc Am|SV*|newSVpvn_utf8|const char* s|STRLEN len|U32 utf8
2299 Creates a new SV and copies a string (which may contain C<NUL> (C<\0>)
2300 characters) into it. If C<utf8> is true, calls
2301 C<SvUTF8_on> on the new SV. Implemented as a wrapper around C<newSVpvn_flags>.
2306 #define newSVpvn_utf8(s, len, u) newSVpvn_flags((s), (len), (u) ? SVf_UTF8 : 0)
2309 =for apidoc Amx|SV*|newSVpadname|PADNAME *pn
2311 Creates a new SV containing the pad name.
2316 #define newSVpadname(pn) newSVpvn_utf8(PadnamePV(pn), PadnameLEN(pn), TRUE)
2319 =for apidoc Am|void|SvOOK_offset|SV*sv|STRLEN len
2321 Reads into C<len> the offset from C<SvPVX> back to the true start of the
2322 allocated buffer, which will be non-zero if C<sv_chop> has been used to
2323 efficiently remove characters from start of the buffer. Implemented as a
2324 macro, which takes the address of C<len>, which must be of type C<STRLEN>.
2325 Evaluates C<sv> more than once. Sets C<len> to 0 if C<SvOOK(sv)> is false.
2331 /* Does the bot know something I don't?
2332 10:28 <@Nicholas> metabatman
2333 10:28 <+meta> Nicholas: crash
2335 # define SvOOK_offset(sv, offset) STMT_START { \
2336 STATIC_ASSERT_STMT(sizeof(offset) == sizeof(STRLEN)); \
2338 const U8 *_crash = (U8*)SvPVX_const(sv); \
2339 (offset) = *--_crash; \
2341 _crash -= sizeof(STRLEN); \
2342 Copy(_crash, (U8 *)&(offset), sizeof(STRLEN), U8); \
2345 /* Validate the preceding buffer's sentinels to \
2346 verify that no-one is using it. */ \
2347 const U8 *const _bonk = (U8*)SvPVX_const(sv) - (offset);\
2348 while (_crash > _bonk) { \
2350 assert (*_crash == (U8)PTR2UV(_crash)); \
2358 /* This is the same code, but avoids using any temporary variables: */
2359 # define SvOOK_offset(sv, offset) STMT_START { \
2360 STATIC_ASSERT_STMT(sizeof(offset) == sizeof(STRLEN)); \
2362 (offset) = ((U8*)SvPVX_const(sv))[-1]; \
2364 Copy(SvPVX_const(sv) - 1 - sizeof(STRLEN), \
2365 (U8*)&(offset), sizeof(STRLEN), U8); \
2373 #define newIO() MUTABLE_IO(newSV_type(SVt_PVIO))
2375 #define SV_CONST(name) \
2376 PL_sv_consts[SV_CONST_##name] \
2377 ? PL_sv_consts[SV_CONST_##name] \
2378 : (PL_sv_consts[SV_CONST_##name] = newSVpv_share(#name, 0))
2380 #define SV_CONST_TIESCALAR 0
2381 #define SV_CONST_TIEARRAY 1
2382 #define SV_CONST_TIEHASH 2
2383 #define SV_CONST_TIEHANDLE 3
2385 #define SV_CONST_FETCH 4
2386 #define SV_CONST_FETCHSIZE 5
2387 #define SV_CONST_STORE 6
2388 #define SV_CONST_STORESIZE 7
2389 #define SV_CONST_EXISTS 8
2391 #define SV_CONST_PUSH 9
2392 #define SV_CONST_POP 10
2393 #define SV_CONST_SHIFT 11
2394 #define SV_CONST_UNSHIFT 12
2395 #define SV_CONST_SPLICE 13
2396 #define SV_CONST_EXTEND 14
2398 #define SV_CONST_FIRSTKEY 15
2399 #define SV_CONST_NEXTKEY 16
2400 #define SV_CONST_SCALAR 17
2402 #define SV_CONST_OPEN 18
2403 #define SV_CONST_WRITE 19
2404 #define SV_CONST_PRINT 20
2405 #define SV_CONST_PRINTF 21
2406 #define SV_CONST_READ 22
2407 #define SV_CONST_READLINE 23
2408 #define SV_CONST_GETC 24
2409 #define SV_CONST_SEEK 25
2410 #define SV_CONST_TELL 26
2411 #define SV_CONST_EOF 27
2412 #define SV_CONST_BINMODE 28
2413 #define SV_CONST_FILENO 29
2414 #define SV_CONST_CLOSE 30
2416 #define SV_CONST_DELETE 31
2417 #define SV_CONST_CLEAR 32
2418 #define SV_CONST_UNTIE 33
2419 #define SV_CONST_DESTROY 34
2421 #define SV_CONSTS_COUNT 35
2424 * Bodyless IVs and NVs!
2426 * Since 5.9.2, we can avoid allocating a body for SVt_IV-type SVs.
2427 * Since the larger IV-holding variants of SVs store their integer
2428 * values in their respective bodies, the family of SvIV() accessor
2429 * macros would naively have to branch on the SV type to find the
2430 * integer value either in the HEAD or BODY. In order to avoid this
2431 * expensive branch, a clever soul has deployed a great hack:
2432 * We set up the SvANY pointer such that instead of pointing to a
2433 * real body, it points into the memory before the location of the
2434 * head. We compute this pointer such that the location of
2435 * the integer member of the hypothetical body struct happens to
2436 * be the same as the location of the integer member of the bodyless
2437 * SV head. This now means that the SvIV() family of accessors can
2438 * always read from the (hypothetical or real) body via SvANY.
2440 * Since the 5.21 dev series, we employ the same trick for NVs
2441 * if the architecture can support it (NVSIZE <= IVSIZE).
2444 /* The following two macros compute the necessary offsets for the above
2445 * trick and store them in SvANY for SvIV() (and friends) to use. */
2448 # define SET_SVANY_FOR_BODYLESS_IV(sv) \
2449 SvANY(sv) = (XPVIV*)((char*)&(sv->sv_u.svu_iv) \
2450 - STRUCT_OFFSET(XPVIV, xiv_iv))
2452 # define SET_SVANY_FOR_BODYLESS_NV(sv) \
2453 SvANY(sv) = (XPVNV*)((char*)&(sv->sv_u.svu_nv) \
2454 - STRUCT_OFFSET(XPVNV, xnv_u.xnv_nv))
2458 * ex: set ts=8 sts=4 sw=4 et:
https://perl5.git.perl.org / perl5.git / blob