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 expressions. SVt_INVLIST is for Perl
61 core internal use only.
63 SVt_PVMG represents a "normal" scalar (not a typeglob, regular expression,
64 or delegate). Since most scalars do not need all the internal fields of a
65 PVMG, we save memory by allocating smaller structs when possible. All the
66 other types are just simpler forms of SVt_PVMG, with fewer internal fields.
67 SVt_NULL can only hold undef. SVt_IV can hold undef, an integer, or a
68 reference. (SVt_RV is an alias for SVt_IV, which exists for backward
69 compatibility.) SVt_NV can hold any of those or a double. SVt_PV can only
70 hold undef or a string. SVt_PVIV is a superset of SVt_PV and SVt_IV.
71 SVt_PVNV is similar. SVt_PVMG can hold anything SVt_PVNV can hold, but it
72 can, but does not have to, be blessed or magical.
74 =for apidoc AmU||SVt_NULL
75 Type flag for scalars. See L</svtype>.
77 =for apidoc AmU||SVt_IV
78 Type flag for scalars. See L</svtype>.
80 =for apidoc AmU||SVt_NV
81 Type flag for scalars. See L</svtype>.
83 =for apidoc AmU||SVt_PV
84 Type flag for scalars. See L</svtype>.
86 =for apidoc AmU||SVt_PVIV
87 Type flag for scalars. See L</svtype>.
89 =for apidoc AmU||SVt_PVNV
90 Type flag for scalars. See L</svtype>.
92 =for apidoc AmU||SVt_PVMG
93 Type flag for scalars. See L</svtype>.
95 =for apidoc AmU||SVt_INVLIST
96 Type flag for scalars. See L</svtype>.
98 =for apidoc AmU||SVt_REGEXP
99 Type flag for regular expressions. See L</svtype>.
101 =for apidoc AmU||SVt_PVGV
102 Type flag for typeglobs. See L</svtype>.
104 =for apidoc AmU||SVt_PVLV
105 Type flag for scalars. See L</svtype>.
107 =for apidoc AmU||SVt_PVAV
108 Type flag for arrays. See L</svtype>.
110 =for apidoc AmU||SVt_PVHV
111 Type flag for hashes. See L</svtype>.
113 =for apidoc AmU||SVt_PVCV
114 Type flag for subroutines. See L</svtype>.
116 =for apidoc AmU||SVt_PVFM
117 Type flag for formats. See L</svtype>.
119 =for apidoc AmU||SVt_PVIO
120 Type flag for I/O objects. See L</svtype>.
124 These are ordered so that the simpler types have a lower value; SvUPGRADE
125 doesn't allow you to upgrade from a higher numbered type to a lower numbered
126 one; also there is code that assumes that anything that has as a PV component
127 has a type numbered >= SVt_PV.
133 /* BIND was here, before INVLIST replaced it. */
136 /* RV was here, before it was merged with IV. */
138 SVt_INVLIST, /* 4, implemented as a PV */
143 /* PVBM was here, before BIND replaced it. */
151 SVt_LAST /* keep last in enum. used to size arrays */
154 /* *** any alterations to the SV types above need to be reflected in
155 * SVt_MASK and the various PL_valid_types_* tables. As of this writing those
156 * tables are in perl.h. There are also two affected names tables in dump.c,
157 * one in B.xs, and 'bodies_by_type[]' in sv.c */
159 #define SVt_MASK 0xf /* smallest bitmask that covers all types */
162 /* Although Fast Boyer Moore tables are now being stored in PVGVs, for most
163 purposes external code wanting to consider PVBM probably needs to think of
165 # define SVt_PVBM SVt_PVMG
166 /* Anything wanting to create a reference from clean should ensure that it has
167 a scalar of type SVt_IV now: */
168 # define SVt_RV SVt_IV
171 /* There is collusion here with sv_clear - sv_clear exits early for SVt_NULL
172 so never reaches the clause at the end that uses sv_type_details->body_size
173 to determine whether to call safefree(). Hence body_size can be set
174 non-zero to record the size of HEs, without fear of bogus frees. */
175 #if defined(PERL_IN_HV_C) || defined(PERL_IN_XS_APITEST)
176 #define HE_SVSLOT SVt_NULL
179 #define PERL_ARENA_ROOTS_SIZE (SVt_LAST)
181 /* typedefs to eliminate some typing */
182 typedef struct he HE;
183 typedef struct hek HEK;
185 /* Using C's structural equivalence to help emulate C++ inheritance here... */
187 /* start with 2 sv-head building blocks */
188 #define _SV_HEAD(ptrtype) \
189 ptrtype sv_any; /* pointer to body */ \
190 U32 sv_refcnt; /* how many references to us */ \
191 U32 sv_flags /* what we are */
193 #define _SV_HEAD_UNION \
195 char* svu_pv; /* pointer to malloced string */ \
198 SV* svu_rv; /* pointer to another SV */ \
199 struct regexp* svu_rx; \
207 struct STRUCT_SV { /* struct sv { */
210 #ifdef DEBUG_LEAKING_SCALARS
211 PERL_BITFIELD32 sv_debug_optype:9; /* the type of OP that allocated us */
212 PERL_BITFIELD32 sv_debug_inpad:1; /* was allocated in a pad for an OP */
213 PERL_BITFIELD32 sv_debug_line:16; /* the line where we were allocated */
214 UV sv_debug_serial; /* serial number of sv allocation */
215 char * sv_debug_file; /* the file where we were allocated */
216 SV * sv_debug_parent; /* what we were cloned from (ithreads)*/
221 _SV_HEAD(XPVGV*); /* pointer to xpvgv body */
226 _SV_HEAD(XPVCV*); /* pointer to xpvcv body */
231 _SV_HEAD(XPVAV*); /* pointer to xpvav body */
236 _SV_HEAD(XPVHV*); /* pointer to xpvhv body */
241 _SV_HEAD(XPVIO*); /* pointer to xpvio body */
246 _SV_HEAD(struct regexp*); /* pointer to regexp body */
251 #undef _SV_HEAD_UNION /* ensure no pollution */
254 =head1 SV Manipulation Functions
256 =for apidoc Am|U32|SvREFCNT|SV* sv
257 Returns the value of the object's reference count.
259 =for apidoc Am|SV*|SvREFCNT_inc|SV* sv
260 Increments the reference count of the given SV, returning the SV.
262 All of the following SvREFCNT_inc* macros are optimized versions of
263 SvREFCNT_inc, and can be replaced with SvREFCNT_inc.
265 =for apidoc Am|SV*|SvREFCNT_inc_NN|SV* sv
266 Same as SvREFCNT_inc, but can only be used if you know I<sv>
267 is not NULL. Since we don't have to check the NULLness, it's faster
270 =for apidoc Am|void|SvREFCNT_inc_void|SV* sv
271 Same as SvREFCNT_inc, but can only be used if you don't need the
272 return value. The macro doesn't need to return a meaningful value.
274 =for apidoc Am|void|SvREFCNT_inc_void_NN|SV* sv
275 Same as SvREFCNT_inc, but can only be used if you don't need the return
276 value, and you know that I<sv> is not NULL. The macro doesn't need
277 to return a meaningful value, or check for NULLness, so it's smaller
280 =for apidoc Am|SV*|SvREFCNT_inc_simple|SV* sv
281 Same as SvREFCNT_inc, but can only be used with expressions without side
282 effects. Since we don't have to store a temporary value, it's faster.
284 =for apidoc Am|SV*|SvREFCNT_inc_simple_NN|SV* sv
285 Same as SvREFCNT_inc_simple, but can only be used if you know I<sv>
286 is not NULL. Since we don't have to check the NULLness, it's faster
289 =for apidoc Am|void|SvREFCNT_inc_simple_void|SV* sv
290 Same as SvREFCNT_inc_simple, 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_simple_void_NN|SV* sv
294 Same as SvREFCNT_inc, but can only be used if you don't need the return
295 value, and you know that I<sv> is not NULL. The macro doesn't need
296 to return a meaningful value, or check for NULLness, so it's smaller
299 =for apidoc Am|void|SvREFCNT_dec|SV* sv
300 Decrements the reference count of the given SV. I<sv> may be NULL.
302 =for apidoc Am|void|SvREFCNT_dec_NN|SV* sv
303 Same as SvREFCNT_dec, but can only be used if you know I<sv>
304 is not NULL. Since we don't have to check the NULLness, it's faster
307 =for apidoc Am|svtype|SvTYPE|SV* sv
308 Returns the type of the SV. See C<svtype>.
310 =for apidoc Am|void|SvUPGRADE|SV* sv|svtype type
311 Used to upgrade an SV to a more complex form. Uses C<sv_upgrade> to
312 perform the upgrade if necessary. See C<svtype>.
317 #define SvANY(sv) (sv)->sv_any
318 #define SvFLAGS(sv) (sv)->sv_flags
319 #define SvREFCNT(sv) (sv)->sv_refcnt
321 #define SvREFCNT_inc(sv) S_SvREFCNT_inc(MUTABLE_SV(sv))
322 #define SvREFCNT_inc_simple(sv) SvREFCNT_inc(sv)
323 #define SvREFCNT_inc_NN(sv) S_SvREFCNT_inc_NN(MUTABLE_SV(sv))
324 #define SvREFCNT_inc_void(sv) S_SvREFCNT_inc_void(MUTABLE_SV(sv))
326 /* These guys don't need the curly blocks */
327 #define SvREFCNT_inc_simple_void(sv) STMT_START { if (sv) SvREFCNT(sv)++; } STMT_END
328 #define SvREFCNT_inc_simple_NN(sv) (++(SvREFCNT(sv)),MUTABLE_SV(sv))
329 #define SvREFCNT_inc_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
330 #define SvREFCNT_inc_simple_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
332 #define SvREFCNT_dec(sv) S_SvREFCNT_dec(aTHX_ MUTABLE_SV(sv))
333 #define SvREFCNT_dec_NN(sv) S_SvREFCNT_dec_NN(aTHX_ MUTABLE_SV(sv))
335 #define SVTYPEMASK 0xff
336 #define SvTYPE(sv) ((svtype)((sv)->sv_flags & SVTYPEMASK))
338 /* Sadly there are some parts of the core that have pointers to already-freed
339 SV heads, and rely on being able to tell that they are now free. So mark
340 them all by using a consistent macro. */
341 #define SvIS_FREED(sv) ((sv)->sv_flags == SVTYPEMASK)
343 /* this is defined in this peculiar way to avoid compiler warnings.
344 * See the <20121213131428.GD1842@iabyn.com> thread in p5p */
345 #define SvUPGRADE(sv, mt) \
346 ((void)(SvTYPE(sv) >= (mt) || (sv_upgrade(sv, mt),1)))
348 #define SVf_IOK 0x00000100 /* has valid public integer value */
349 #define SVf_NOK 0x00000200 /* has valid public numeric value */
350 #define SVf_POK 0x00000400 /* has valid public pointer value */
351 #define SVf_ROK 0x00000800 /* has a valid reference pointer */
353 #define SVp_IOK 0x00001000 /* has valid non-public integer value */
354 #define SVp_NOK 0x00002000 /* has valid non-public numeric value */
355 #define SVp_POK 0x00004000 /* has valid non-public pointer value */
356 #define SVp_SCREAM 0x00008000 /* method name is DOES */
357 #define SVphv_CLONEABLE SVp_SCREAM /* PVHV (stashes) clone its objects */
358 #define SVpgv_GP SVp_SCREAM /* GV has a valid GP */
359 #define SVprv_PCS_IMPORTED SVp_SCREAM /* RV is a proxy for a constant
360 subroutine in another package. Set the
361 GvIMPORTED_CV_on() if it needs to be
362 expanded to a real GV */
363 #define SVpad_NAMELIST SVp_SCREAM /* AV is a padnamelist */
364 #define SVf_IsCOW 0x00010000 /* copy on write (shared hash key if
366 /* Also used on HVs in gv.c:gv_check */
367 #define SVs_PADTMP 0x00020000 /* in use as tmp; only if ! SVs_PADMY */
368 #define SVs_PADSTALE 0x00020000 /* lexical has gone out of scope;
369 only valid for SVs_PADMY */
370 #define SVpad_TYPED 0x00020000 /* pad name is a Typed Lexical */
371 #define SVs_PADMY 0x00040000 /* in use a "my" variable */
372 #define SVpad_OUR 0x00040000 /* pad name is "our" instead of "my" */
373 #define SVs_TEMP 0x00080000 /* string is stealable? */
374 #define SVs_OBJECT 0x00100000 /* is "blessed" */
375 #define SVs_GMG 0x00200000 /* has magical get method */
376 #define SVs_SMG 0x00400000 /* has magical set method */
377 #define SVs_RMG 0x00800000 /* has random magical methods */
379 #define SVf_FAKE 0x01000000 /* 0: glob is just a copy
380 1: SV head arena wasn't malloc()ed
381 2: For PVCV, whether CvUNIQUE(cv)
382 refers to an eval or once only
383 [CvEVAL(cv), CvSPECIAL(cv)]
384 3: On a pad name SV, that slot in the
385 frame AV is a REFCNT'ed reference
386 to a lexical from "outside". */
387 #define SVf_OOK 0x02000000 /* has valid offset value. For a PVHV this
388 means that a hv_aux struct is present
389 after the main array */
390 #define SVf_BREAK 0x04000000 /* refcnt is artificially low - used by
391 SVs in final arena cleanup.
392 Set in S_regtry on PL_reg_curpm, so that
393 perl_destruct will skip it. */
394 #define SVf_READONLY 0x08000000 /* may not be modified */
399 #define SVf_THINKFIRST (SVf_READONLY|SVf_ROK|SVf_FAKE|SVs_RMG|SVf_IsCOW)
401 #define SVf_OK (SVf_IOK|SVf_NOK|SVf_POK|SVf_ROK| \
402 SVp_IOK|SVp_NOK|SVp_POK|SVpgv_GP)
404 #define PRIVSHIFT 4 /* (SVp_?OK >> PRIVSHIFT) == SVf_?OK */
406 #define SVf_AMAGIC 0x10000000 /* has magical overloaded methods */
408 /* Ensure this value does not clash with the GV_ADD* flags in gv.h: */
409 #define SVf_UTF8 0x20000000 /* SvPV is UTF-8 encoded
410 This is also set on RVs whose overloaded
411 stringification is UTF-8. This might
412 only happen as a side effect of SvPV() */
415 /* Some private flags. */
417 /* PVAV could probably use 0x2000000 without conflict. I assume that PVFM can
418 be UTF-8 encoded, and PVCVs could well have UTF-8 prototypes. PVIOs haven't
419 been restructured, so sometimes get used as string buffers. */
422 #define SVphv_SHAREKEYS 0x20000000 /* PVHV keys live on shared string table */
424 /* PVNV, PVMG only, and only used in pads. Should be safe to test on any scalar
425 SV, as the core is careful to avoid setting both.
427 SVf_POK, SVp_POK also set:
429 0x0000C400 method name for DOES (SvSCREAM)
430 0x40004400 FBM compiled (SvVALID)
433 0x00008000 GV with GP
434 0x00008800 RV with PCS imported
436 #define SVpad_NAME (SVp_SCREAM|SVpbm_VALID)
437 /* This SV is a name in the PAD, so
438 SVpad_TYPED, SVpad_OUR and SVpad_STATE
441 #define SVpav_REAL 0x40000000 /* free old entries */
443 #define SVphv_LAZYDEL 0x40000000 /* entry in xhv_eiter must be deleted */
444 /* This is only set true on a PVGV when it's playing "PVBM", but is tested for
445 on any regular scalar (anything <= PVLV) */
446 #define SVpbm_VALID 0x40000000
447 /* Only used in toke.c on an SV stored in PL_lex_repl */
448 #define SVrepl_EVAL 0x40000000 /* Replacement part of s///e */
450 /* IV, PVIV, PVNV, PVMG, PVGV and (I assume) PVLV */
451 #define SVf_IVisUV 0x80000000 /* use XPVUV instead of XPVIV */
453 #define SVpav_REIFY 0x80000000 /* can become real */
455 #define SVphv_HASKFLAGS 0x80000000 /* keys have flag byte after hash */
456 /* PVGV when SVpbm_VALID is true */
457 #define SVpbm_TAIL 0x80000000
458 /* RV upwards. However, SVf_ROK and SVp_IOK are exclusive */
459 #define SVprv_WEAKREF 0x80000000 /* Weak reference */
460 /* pad name vars only */
461 #define SVpad_STATE 0x80000000 /* pad name is a "state" var */
464 HV* xmg_stash; /* class package */ \
466 STRLEN xpv_cur; /* length of svu_pv as a C string */ \
468 STRLEN xpvlenu_len; /* allocated size */ \
469 char * xpvlenu_pv; /* regexp string */ \
472 #define xpv_len xpv_len_u.xpvlenu_len
475 NV xnv_nv; /* numeric value, if any */
480 } xpad_cop_seq; /* used by pad.c for cop_sequence */
484 IV xivu_iv; /* integer value */
486 HEK * xivu_namehek; /* xpvlv, xpvgv: GvNAME */
490 MAGIC* xmg_magic; /* linked list of magicalness */
491 HV* xmg_ourstash; /* Stash for our (when SvPAD_OUR is true) */
492 STRLEN xmg_hash_index; /* used while freeing hash entries */
493 }; /* also used by PadnamelistMAXNAMED */
504 #define xiv_iv xiv_u.xivu_iv
511 #define xuv_uv xuv_u.xivu_uv
519 /* This structure must match the beginning of struct xpvhv in hv.h. */
532 SSize_t xlvu_stargoff;
536 char xlv_type; /* k=keys .=pos x=substr v=vec /=join/re
537 * y=alem/helem/iter t=tie T=tied HE */
538 char xlv_flags; /* 1 = negative offset 2 = negative len */
541 #define xlv_targoff xlv_targoff_u.xlvu_targoff
547 bool is_offset; /* */
550 /* This structure works in 3 ways - regular scalar, GV with GP, or fast
558 typedef U32 cv_flags_t;
560 #define _XPVCV_COMMON \
568 void (*xcv_xsub) (pTHX_ CV*); \
575 PADLIST * xcv_padlist; \
577 U32 xcv_outside_seq; /* the COP sequence (at the point of our \
578 * compilation) in the lexically enclosing \
580 cv_flags_t xcv_flags; \
581 I32 xcv_depth /* >= 2 indicates recursive call */
583 /* This structure must match XPVCV in cv.h */
594 /* ifp and ofp are normally the same, but sockets need separate streams */
596 /* Cray addresses everything by word boundaries (64 bits) and
597 * code and data pointers cannot be mixed (which is exactly what
598 * Perl_filter_add() tries to do with the dirp), hence the
599 * following union trick (as suggested by Gurusamy Sarathy).
600 * For further information see Geir Johansen's problem report
601 * titled [ID 20000612.002] Perl problem on Cray system
602 * The any pointer (known as IoANY()) will also be a good place
603 * to hang any IO disciplines to.
606 DIR * xiou_dirp; /* for opendir, readdir, etc */
607 void * xiou_any; /* for alignment */
609 /* IV xio_lines is now in IVX $. */
610 IV xio_page; /* $% */
611 IV xio_page_len; /* $= */
612 IV xio_lines_left; /* $- */
613 char * xio_top_name; /* $^ */
614 GV * xio_top_gv; /* $^ */
615 char * xio_fmt_name; /* $~ */
616 GV * xio_fmt_gv; /* $~ */
617 char * xio_bottom_name;/* $^B */
618 GV * xio_bottom_gv; /* $^B */
623 #define xio_dirp xio_dirpu.xiou_dirp
624 #define xio_any xio_dirpu.xiou_any
626 #define IOf_ARGV 1 /* this fp iterates over ARGV */
627 #define IOf_START 2 /* check for null ARGV and substitute '-' */
628 #define IOf_FLUSH 4 /* this fp wants a flush after write op */
629 #define IOf_DIDTOP 8 /* just did top of form */
630 #define IOf_UNTAINT 16 /* consider this fp (and its data) "safe" */
631 #define IOf_NOLINE 32 /* slurped a pseudo-line from empty file */
632 #define IOf_FAKE_DIRP 64 /* xio_dirp is fake (source filters kludge)
633 Also, when this is set, SvPVX() is valid */
635 /* The following macros define implementation-independent predicates on SVs. */
638 =for apidoc Am|U32|SvNIOK|SV* sv
639 Returns a U32 value indicating whether the SV contains a number, integer or
642 =for apidoc Am|U32|SvNIOKp|SV* sv
643 Returns a U32 value indicating whether the SV contains a number, integer or
644 double. Checks the B<private> setting. Use C<SvNIOK> instead.
646 =for apidoc Am|void|SvNIOK_off|SV* sv
647 Unsets the NV/IV status of an SV.
649 =for apidoc Am|U32|SvOK|SV* sv
650 Returns a U32 value indicating whether the value is defined. This is
651 only meaningful for scalars.
653 =for apidoc Am|U32|SvIOKp|SV* sv
654 Returns a U32 value indicating whether the SV contains an integer. Checks
655 the B<private> setting. Use C<SvIOK> instead.
657 =for apidoc Am|U32|SvNOKp|SV* sv
658 Returns a U32 value indicating whether the SV contains a double. Checks the
659 B<private> setting. Use C<SvNOK> instead.
661 =for apidoc Am|U32|SvPOKp|SV* sv
662 Returns a U32 value indicating whether the SV contains a character string.
663 Checks the B<private> setting. Use C<SvPOK> instead.
665 =for apidoc Am|U32|SvIOK|SV* sv
666 Returns a U32 value indicating whether the SV contains an integer.
668 =for apidoc Am|void|SvIOK_on|SV* sv
669 Tells an SV that it is an integer.
671 =for apidoc Am|void|SvIOK_off|SV* sv
672 Unsets the IV status of an SV.
674 =for apidoc Am|void|SvIOK_only|SV* sv
675 Tells an SV that it is an integer and disables all other OK bits.
677 =for apidoc Am|void|SvIOK_only_UV|SV* sv
678 Tells an SV that it is an unsigned integer and disables all other OK bits.
680 =for apidoc Am|bool|SvIOK_UV|SV* sv
681 Returns a boolean indicating whether the SV contains an integer that must be
682 interpreted as unsigned. A non-negative integer whose value is within the
683 range of both an IV and a UV may be be flagged as either SvUOK or SVIOK.
685 =for apidoc Am|bool|SvUOK|SV* sv
686 Returns a boolean indicating whether the SV contains an integer that must be
687 interpreted as unsigned. A non-negative integer whose value is within the
688 range of both an IV and a UV may be be flagged as either SvUOK or SVIOK.
690 =for apidoc Am|bool|SvIOK_notUV|SV* sv
691 Returns a boolean indicating whether the SV contains a signed integer.
693 =for apidoc Am|U32|SvNOK|SV* sv
694 Returns a U32 value indicating whether the SV contains a double.
696 =for apidoc Am|void|SvNOK_on|SV* sv
697 Tells an SV that it is a double.
699 =for apidoc Am|void|SvNOK_off|SV* sv
700 Unsets the NV status of an SV.
702 =for apidoc Am|void|SvNOK_only|SV* sv
703 Tells an SV that it is a double and disables all other OK bits.
705 =for apidoc Am|U32|SvPOK|SV* sv
706 Returns a U32 value indicating whether the SV contains a character
709 =for apidoc Am|void|SvPOK_on|SV* sv
710 Tells an SV that it is a string.
712 =for apidoc Am|void|SvPOK_off|SV* sv
713 Unsets the PV status of an SV.
715 =for apidoc Am|void|SvPOK_only|SV* sv
716 Tells an SV that it is a string and disables all other OK bits.
717 Will also turn off the UTF-8 status.
719 =for apidoc Am|bool|SvVOK|SV* sv
720 Returns a boolean indicating whether the SV contains a v-string.
722 =for apidoc Am|U32|SvOOK|SV* sv
723 Returns a U32 indicating whether the pointer to the string buffer is offset.
724 This hack is used internally to speed up removal of characters from the
725 beginning of a SvPV. When SvOOK is true, then the start of the
726 allocated string buffer is actually C<SvOOK_offset()> bytes before SvPVX.
727 This offset used to be stored in SvIVX, but is now stored within the spare
730 =for apidoc Am|U32|SvROK|SV* sv
731 Tests if the SV is an RV.
733 =for apidoc Am|void|SvROK_on|SV* sv
734 Tells an SV that it is an RV.
736 =for apidoc Am|void|SvROK_off|SV* sv
737 Unsets the RV status of an SV.
739 =for apidoc Am|SV*|SvRV|SV* sv
740 Dereferences an RV to return the SV.
742 =for apidoc Am|IV|SvIVX|SV* sv
743 Returns the raw value in the SV's IV slot, without checks or conversions.
744 Only use when you are sure SvIOK is true. See also C<SvIV()>.
746 =for apidoc Am|UV|SvUVX|SV* sv
747 Returns the raw value in the SV's UV slot, without checks or conversions.
748 Only use when you are sure SvIOK is true. See also C<SvUV()>.
750 =for apidoc Am|NV|SvNVX|SV* sv
751 Returns the raw value in the SV's NV slot, without checks or conversions.
752 Only use when you are sure SvNOK is true. See also C<SvNV()>.
754 =for apidoc Am|char*|SvPVX|SV* sv
755 Returns a pointer to the physical string in the SV. The SV must contain a
756 string. Prior to 5.9.3 it is not safe to execute this macro unless the SV's
759 This is also used to store the name of an autoloaded subroutine in an XS
760 AUTOLOAD routine. See L<perlguts/Autoloading with XSUBs>.
762 =for apidoc Am|STRLEN|SvCUR|SV* sv
763 Returns the length of the string which is in the SV. See C<SvLEN>.
765 =for apidoc Am|STRLEN|SvLEN|SV* sv
766 Returns the size of the string buffer in the SV, not including any part
767 attributable to C<SvOOK>. See C<SvCUR>.
769 =for apidoc Am|char*|SvEND|SV* sv
770 Returns a pointer to the spot just after the last character in
771 the string which is in the SV, where there is usually a trailing
772 null (even though Perl scalars do not strictly require it).
773 See C<SvCUR>. Access the character as *(SvEND(sv)).
775 Warning: If C<SvCUR> is equal to C<SvLEN>, then C<SvEND> points to
778 =for apidoc Am|HV*|SvSTASH|SV* sv
779 Returns the stash of the SV.
781 =for apidoc Am|void|SvIV_set|SV* sv|IV val
782 Set the value of the IV pointer in sv to val. It is possible to perform
783 the same function of this macro with an lvalue assignment to C<SvIVX>.
784 With future Perls, however, it will be more efficient to use
785 C<SvIV_set> instead of the lvalue assignment to C<SvIVX>.
787 =for apidoc Am|void|SvNV_set|SV* sv|NV val
788 Set the value of the NV pointer in sv to val. See C<SvIV_set>.
790 =for apidoc Am|void|SvPV_set|SV* sv|char* val
791 Set the value of the PV pointer in sv to val. See also C<SvIV_set>.
793 Beware that the existing pointer may be involved in copy-on-write or other
794 mischief, so do C<SvOOK_off(sv)> and use C<sv_force_normal> or
795 C<SvPV_force> (or check the SvIsCOW flag) first to make sure this
796 modification is safe.
798 =for apidoc Am|void|SvUV_set|SV* sv|UV val
799 Set the value of the UV pointer in sv to val. See C<SvIV_set>.
801 =for apidoc Am|void|SvRV_set|SV* sv|SV* val
802 Set the value of the RV pointer in sv to val. See C<SvIV_set>.
804 =for apidoc Am|void|SvMAGIC_set|SV* sv|MAGIC* val
805 Set the value of the MAGIC pointer in sv to val. See C<SvIV_set>.
807 =for apidoc Am|void|SvSTASH_set|SV* sv|HV* val
808 Set the value of the STASH pointer in sv to val. See C<SvIV_set>.
810 =for apidoc Am|void|SvCUR_set|SV* sv|STRLEN len
811 Set the current length of the string which is in the SV. See C<SvCUR>
814 =for apidoc Am|void|SvLEN_set|SV* sv|STRLEN len
815 Set the actual length of the string which is in the SV. See C<SvIV_set>.
820 #define SvNIOK(sv) (SvFLAGS(sv) & (SVf_IOK|SVf_NOK))
821 #define SvNIOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK))
822 #define SvNIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK| \
823 SVp_IOK|SVp_NOK|SVf_IVisUV))
825 #define assert_not_ROK(sv) assert_(!SvROK(sv) || !SvRV(sv))
826 #define assert_not_glob(sv) assert_(!isGV_with_GP(sv))
828 #define SvOK(sv) (SvFLAGS(sv) & SVf_OK || isREGEXP(sv))
829 #define SvOK_off(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
830 SvFLAGS(sv) &= ~(SVf_OK| \
831 SVf_IVisUV|SVf_UTF8), \
833 #define SvOK_off_exc_UV(sv) (assert_not_ROK(sv) \
834 SvFLAGS(sv) &= ~(SVf_OK| \
838 #define SvOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK))
839 #define SvIOKp(sv) (SvFLAGS(sv) & SVp_IOK)
840 #define SvIOKp_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
841 SvFLAGS(sv) |= SVp_IOK)
842 #define SvNOKp(sv) (SvFLAGS(sv) & SVp_NOK)
843 #define SvNOKp_on(sv) (assert_not_glob(sv) SvFLAGS(sv) |= SVp_NOK)
844 #define SvPOKp(sv) (SvFLAGS(sv) & SVp_POK)
845 #define SvPOKp_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
846 SvFLAGS(sv) |= SVp_POK)
848 #define SvIOK(sv) (SvFLAGS(sv) & SVf_IOK)
849 #define SvIOK_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
850 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
851 #define SvIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVp_IOK|SVf_IVisUV))
852 #define SvIOK_only(sv) (SvOK_off(sv), \
853 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
854 #define SvIOK_only_UV(sv) (assert_not_glob(sv) SvOK_off_exc_UV(sv), \
855 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
857 #define SvIOK_UV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
858 == (SVf_IOK|SVf_IVisUV))
859 #define SvUOK(sv) SvIOK_UV(sv)
860 #define SvIOK_notUV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
863 #define SvIsUV(sv) (SvFLAGS(sv) & SVf_IVisUV)
864 #define SvIsUV_on(sv) (SvFLAGS(sv) |= SVf_IVisUV)
865 #define SvIsUV_off(sv) (SvFLAGS(sv) &= ~SVf_IVisUV)
867 #define SvNOK(sv) (SvFLAGS(sv) & SVf_NOK)
868 #define SvNOK_on(sv) (assert_not_glob(sv) \
869 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
870 #define SvNOK_off(sv) (SvFLAGS(sv) &= ~(SVf_NOK|SVp_NOK))
871 #define SvNOK_only(sv) (SvOK_off(sv), \
872 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
875 =for apidoc Am|U32|SvUTF8|SV* sv
876 Returns a U32 value indicating the UTF-8 status of an SV. If things are set-up
877 properly, this indicates whether or not the SV contains UTF-8 encoded data.
878 You should use this I<after> a call to SvPV() or one of its variants, in
879 case any call to string overloading updates the internal flag.
881 =for apidoc Am|void|SvUTF8_on|SV *sv
882 Turn on the UTF-8 status of an SV (the data is not changed, just the flag).
883 Do not use frivolously.
885 =for apidoc Am|void|SvUTF8_off|SV *sv
886 Unsets the UTF-8 status of an SV (the data is not changed, just the flag).
887 Do not use frivolously.
889 =for apidoc Am|void|SvPOK_only_UTF8|SV* sv
890 Tells an SV that it is a string and disables all other OK bits,
891 and leaves the UTF-8 status as it was.
896 /* Ensure the return value of this macro does not clash with the GV_ADD* flags
898 #define SvUTF8(sv) (SvFLAGS(sv) & SVf_UTF8)
899 #define SvUTF8_on(sv) (SvFLAGS(sv) |= (SVf_UTF8))
900 #define SvUTF8_off(sv) (SvFLAGS(sv) &= ~(SVf_UTF8))
902 #define SvPOK(sv) (SvFLAGS(sv) & SVf_POK)
903 #define SvPOK_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
904 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
905 #define SvPOK_off(sv) (SvFLAGS(sv) &= ~(SVf_POK|SVp_POK))
906 #define SvPOK_only(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
907 SvFLAGS(sv) &= ~(SVf_OK| \
908 SVf_IVisUV|SVf_UTF8), \
909 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
910 #define SvPOK_only_UTF8(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
911 SvFLAGS(sv) &= ~(SVf_OK| \
913 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
915 #define SvVOK(sv) (SvMAGICAL(sv) \
916 && mg_find(sv,PERL_MAGIC_vstring))
917 /* returns the vstring magic, if any */
918 #define SvVSTRING_mg(sv) (SvMAGICAL(sv) \
919 ? mg_find(sv,PERL_MAGIC_vstring) : NULL)
921 #define SvOOK(sv) (SvFLAGS(sv) & SVf_OOK)
922 #define SvOOK_on(sv) (SvFLAGS(sv) |= SVf_OOK)
923 #define SvOOK_off(sv) ((void)(SvOOK(sv) && sv_backoff(sv)))
925 #define SvFAKE(sv) (SvFLAGS(sv) & SVf_FAKE)
926 #define SvFAKE_on(sv) (SvFLAGS(sv) |= SVf_FAKE)
927 #define SvFAKE_off(sv) (SvFLAGS(sv) &= ~SVf_FAKE)
929 #define SvROK(sv) (SvFLAGS(sv) & SVf_ROK)
930 #define SvROK_on(sv) (SvFLAGS(sv) |= SVf_ROK)
931 #define SvROK_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK))
933 #define SvMAGICAL(sv) (SvFLAGS(sv) & (SVs_GMG|SVs_SMG|SVs_RMG))
934 #define SvMAGICAL_on(sv) (SvFLAGS(sv) |= (SVs_GMG|SVs_SMG|SVs_RMG))
935 #define SvMAGICAL_off(sv) (SvFLAGS(sv) &= ~(SVs_GMG|SVs_SMG|SVs_RMG))
937 #define SvGMAGICAL(sv) (SvFLAGS(sv) & SVs_GMG)
938 #define SvGMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_GMG)
939 #define SvGMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_GMG)
941 #define SvSMAGICAL(sv) (SvFLAGS(sv) & SVs_SMG)
942 #define SvSMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_SMG)
943 #define SvSMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_SMG)
945 #define SvRMAGICAL(sv) (SvFLAGS(sv) & SVs_RMG)
946 #define SvRMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_RMG)
947 #define SvRMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_RMG)
949 #define SvAMAGIC(sv) (SvROK(sv) && SvOBJECT(SvRV(sv)) && \
950 HvAMAGIC(SvSTASH(SvRV(sv))))
952 /* To be used on the stashes themselves: */
953 #define HvAMAGIC(hv) (SvFLAGS(hv) & SVf_AMAGIC)
954 #define HvAMAGIC_on(hv) (SvFLAGS(hv) |= SVf_AMAGIC)
955 #define HvAMAGIC_off(hv) (SvFLAGS(hv) &=~ SVf_AMAGIC)
958 /* "nog" means "doesn't have get magic" */
959 #define SvPOK_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVs_GMG)) == SVf_POK)
960 #define SvIOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVs_GMG)) == SVf_IOK)
961 #define SvUOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
962 #define SvNOK_nog(sv) ((SvFLAGS(sv) & (SVf_NOK|SVs_GMG)) == SVf_NOK)
963 #define SvNIOK_nog(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & SVs_GMG))
965 #define SvPOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
966 #define SvIOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_THINKFIRST|SVs_GMG)) == SVf_IOK)
967 #define SvUOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVf_THINKFIRST|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
968 #define SvNOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_NOK|SVf_THINKFIRST|SVs_GMG)) == SVf_NOK)
969 #define SvNIOK_nogthink(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & (SVf_THINKFIRST|SVs_GMG)))
971 #define SvPOK_utf8_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == (SVf_POK|SVf_UTF8))
972 #define SvPOK_utf8_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
974 #define SvPOK_byte_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == SVf_POK)
975 #define SvPOK_byte_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
977 #define SvPOK_pure_nogthink(sv) \
978 ((SvFLAGS(sv) & (SVf_POK|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
979 #define SvPOK_utf8_pure_nogthink(sv) \
980 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
981 #define SvPOK_byte_pure_nogthink(sv) \
982 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
985 =for apidoc Am|U32|SvGAMAGIC|SV* sv
987 Returns true if the SV has get magic or
988 overloading. If either is true then
989 the scalar is active data, and has the potential to return a new value every
990 time it is accessed. Hence you must be careful to
991 only read it once per user logical operation and work
992 with that returned value. If neither is true then
993 the scalar's value cannot change unless written to.
998 #define SvGAMAGIC(sv) (SvGMAGICAL(sv) || SvAMAGIC(sv))
1000 #define Gv_AMG(stash) \
1001 (HvNAME(stash) && Gv_AMupdate(stash,FALSE) \
1003 : (HvAMAGIC_off(stash), 0))
1005 #define SvWEAKREF(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_WEAKREF)) \
1006 == (SVf_ROK|SVprv_WEAKREF))
1007 #define SvWEAKREF_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_WEAKREF))
1008 #define SvWEAKREF_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_WEAKREF))
1010 #define SvPCS_IMPORTED(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_PCS_IMPORTED)) \
1011 == (SVf_ROK|SVprv_PCS_IMPORTED))
1012 #define SvPCS_IMPORTED_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_PCS_IMPORTED))
1013 #define SvPCS_IMPORTED_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_PCS_IMPORTED))
1016 =for apidoc m|U32|SvTHINKFIRST|SV *sv
1018 A quick flag check to see whether an sv should be passed to sv_force_normal
1019 to be "downgraded" before SvIVX or SvPVX can be modified directly.
1021 For example, if your scalar is a reference and you want to modify the SvIVX
1022 slot, you can't just do SvROK_off, as that will leak the referent.
1024 This is used internally by various sv-modifying functions, such as
1025 sv_setsv, sv_setiv and sv_pvn_force.
1027 One case that this does not handle is a gv without SvFAKE set. After
1029 if (SvTHINKFIRST(gv)) sv_force_normal(gv);
1031 it will still be a gv.
1033 SvTHINKFIRST sometimes produces false positives. In those cases
1034 sv_force_normal does nothing.
1039 #define SvTHINKFIRST(sv) (SvFLAGS(sv) & SVf_THINKFIRST)
1041 #define SvPADMY(sv) (SvFLAGS(sv) & SVs_PADMY)
1042 #define SvPADMY_on(sv) (SvFLAGS(sv) |= SVs_PADMY)
1044 /* SVs_PADTMP and SVs_PADSTALE share the same bit, mediated by SVs_PADMY */
1046 #define SvPADTMP(sv) ((SvFLAGS(sv) & (SVs_PADMY|SVs_PADTMP)) == SVs_PADTMP)
1047 #define SvPADSTALE(sv) ((SvFLAGS(sv) & (SVs_PADMY|SVs_PADSTALE)) \
1048 == (SVs_PADMY|SVs_PADSTALE))
1050 #define SvPADTMP_on(sv) S_SvPADTMP_on(MUTABLE_SV(sv))
1051 #define SvPADTMP_off(sv) S_SvPADTMP_off(MUTABLE_SV(sv))
1052 #define SvPADSTALE_on(sv) S_SvPADSTALE_on(MUTABLE_SV(sv))
1053 #define SvPADSTALE_off(sv) S_SvPADSTALE_off(MUTABLE_SV(sv))
1055 #define SvTEMP(sv) (SvFLAGS(sv) & SVs_TEMP)
1056 #define SvTEMP_on(sv) (SvFLAGS(sv) |= SVs_TEMP)
1057 #define SvTEMP_off(sv) (SvFLAGS(sv) &= ~SVs_TEMP)
1059 #define SvOBJECT(sv) (SvFLAGS(sv) & SVs_OBJECT)
1060 #define SvOBJECT_on(sv) (SvFLAGS(sv) |= SVs_OBJECT)
1061 #define SvOBJECT_off(sv) (SvFLAGS(sv) &= ~SVs_OBJECT)
1063 #define SvREADONLY(sv) (SvFLAGS(sv) & SVf_READONLY)
1064 #define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1065 #define SvREADONLY_off(sv) (SvFLAGS(sv) &= ~SVf_READONLY)
1067 #define SvSCREAM(sv) ((SvFLAGS(sv) & (SVp_SCREAM|SVp_POK)) == (SVp_SCREAM|SVp_POK))
1068 #define SvSCREAM_on(sv) (SvFLAGS(sv) |= SVp_SCREAM)
1069 #define SvSCREAM_off(sv) (SvFLAGS(sv) &= ~SVp_SCREAM)
1072 # define SvCOMPILED(sv) 0
1073 # define SvCOMPILED_on(sv)
1074 # define SvCOMPILED_off(sv)
1077 #define SvEVALED(sv) (SvFLAGS(sv) & SVrepl_EVAL)
1078 #define SvEVALED_on(sv) (SvFLAGS(sv) |= SVrepl_EVAL)
1079 #define SvEVALED_off(sv) (SvFLAGS(sv) &= ~SVrepl_EVAL)
1081 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1082 # define SvVALID(sv) ({ const SV *const _svvalid = (const SV*)(sv); \
1083 if (SvFLAGS(_svvalid) & SVpbm_VALID && !SvSCREAM(_svvalid)) \
1084 assert(!isGV_with_GP(_svvalid)); \
1085 (SvFLAGS(_svvalid) & SVpbm_VALID); \
1087 # define SvVALID_on(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
1088 assert(!isGV_with_GP(_svvalid)); \
1089 assert(!SvSCREAM(_svvalid)); \
1090 (SvFLAGS(_svvalid) |= SVpbm_VALID); \
1092 # define SvVALID_off(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
1093 assert(!isGV_with_GP(_svvalid)); \
1094 assert(!SvSCREAM(_svvalid)); \
1095 (SvFLAGS(_svvalid) &= ~SVpbm_VALID); \
1098 # define SvTAIL(sv) ({ const SV *const _svtail = (const SV *)(sv); \
1099 assert(SvTYPE(_svtail) != SVt_PVAV); \
1100 assert(SvTYPE(_svtail) != SVt_PVHV); \
1101 assert(!SvSCREAM(_svtail)); \
1102 (SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1103 == (SVpbm_TAIL|SVpbm_VALID); \
1106 # define SvVALID(sv) ((SvFLAGS(sv) & SVpbm_VALID) && !SvSCREAM(sv))
1107 # define SvVALID_on(sv) (SvFLAGS(sv) |= SVpbm_VALID)
1108 # define SvVALID_off(sv) (SvFLAGS(sv) &= ~SVpbm_VALID)
1109 # define SvTAIL(sv) ((SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1110 == (SVpbm_TAIL|SVpbm_VALID))
1113 #define SvTAIL_on(sv) (SvFLAGS(sv) |= SVpbm_TAIL)
1114 #define SvTAIL_off(sv) (SvFLAGS(sv) &= ~SVpbm_TAIL)
1117 #define SvPAD_TYPED(sv) \
1118 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_TYPED)) == (SVpad_NAME|SVpad_TYPED))
1120 #define SvPAD_OUR(sv) \
1121 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_OUR)) == (SVpad_NAME|SVpad_OUR))
1123 #define SvPAD_STATE(sv) \
1124 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_STATE)) == (SVpad_NAME|SVpad_STATE))
1126 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1127 # define SvPAD_TYPED_on(sv) ({ \
1128 SV *const _svpad = MUTABLE_SV(sv); \
1129 assert(SvTYPE(_svpad) == SVt_PVMG); \
1130 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_TYPED); \
1132 #define SvPAD_OUR_on(sv) ({ \
1133 SV *const _svpad = MUTABLE_SV(sv); \
1134 assert(SvTYPE(_svpad) == SVt_PVMG); \
1135 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_OUR); \
1137 #define SvPAD_STATE_on(sv) ({ \
1138 SV *const _svpad = MUTABLE_SV(sv); \
1139 assert(SvTYPE(_svpad) == SVt_PVNV || SvTYPE(_svpad) == SVt_PVMG); \
1140 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_STATE); \
1143 # define SvPAD_TYPED_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_TYPED)
1144 # define SvPAD_OUR_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_OUR)
1145 # define SvPAD_STATE_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_STATE)
1148 #define SvOURSTASH(sv) \
1149 (SvPAD_OUR(sv) ? ((XPVMG*) SvANY(sv))->xmg_u.xmg_ourstash : NULL)
1150 #define SvOURSTASH_set(sv, st) \
1152 assert(SvTYPE(sv) == SVt_PVMG); \
1153 ((XPVMG*) SvANY(sv))->xmg_u.xmg_ourstash = st; \
1156 #define SvRVx(sv) SvRV(sv)
1158 #ifdef PERL_DEBUG_COW
1159 /* Need -0.0 for SvNVX to preserve IEEE FP "negative zero" because
1160 +0.0 + -0.0 => +0.0 but -0.0 + -0.0 => -0.0 */
1161 # define SvIVX(sv) (0 + ((XPVIV*) SvANY(sv))->xiv_iv)
1162 # define SvUVX(sv) (0 + ((XPVUV*) SvANY(sv))->xuv_uv)
1163 # define SvNVX(sv) (-0.0 + ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv)
1164 # define SvRV(sv) (0 + (sv)->sv_u.svu_rv)
1165 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1166 /* Don't test the core XS code yet. */
1167 # if defined (PERL_CORE) && PERL_DEBUG_COW > 1
1168 # define SvPVX(sv) (0 + (assert_(!SvREADONLY(sv)) (sv)->sv_u.svu_pv))
1170 # define SvPVX(sv) SvPVX_mutable(sv)
1172 # define SvCUR(sv) (0 + ((XPV*) SvANY(sv))->xpv_cur)
1173 # define SvLEN(sv) (0 + ((XPV*) SvANY(sv))->xpv_len)
1174 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1176 # define SvMAGIC(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_u.xmg_magic))
1177 # define SvSTASH(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_stash))
1179 # define SvLEN(sv) ((XPV*) SvANY(sv))->xpv_len
1180 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1182 # if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1183 /* These get expanded inside other macros that already use a variable _sv */
1184 # define SvPVX(sv) \
1185 (*({ SV *const _svpvx = MUTABLE_SV(sv); \
1186 assert(PL_valid_types_PVX[SvTYPE(_svpvx) & SVt_MASK]); \
1187 assert(!isGV_with_GP(_svpvx)); \
1188 assert(!(SvTYPE(_svpvx) == SVt_PVIO \
1189 && !(IoFLAGS(_svpvx) & IOf_FAKE_DIRP))); \
1190 &((_svpvx)->sv_u.svu_pv); \
1192 # define SvCUR(sv) \
1193 (*({ const SV *const _svcur = (const SV *)(sv); \
1194 assert(PL_valid_types_PVX[SvTYPE(_svcur) & SVt_MASK] \
1195 || SvTYPE(_svcur) == SVt_REGEXP); \
1196 assert(!isGV_with_GP(_svcur)); \
1197 assert(!(SvTYPE(_svcur) == SVt_PVIO \
1198 && !(IoFLAGS(_svcur) & IOf_FAKE_DIRP))); \
1199 &(((XPV*) MUTABLE_PTR(SvANY(_svcur)))->xpv_cur); \
1201 # define SvIVX(sv) \
1202 (*({ const SV *const _svivx = (const SV *)(sv); \
1203 assert(PL_valid_types_IVX[SvTYPE(_svivx) & SVt_MASK]); \
1204 assert(!isGV_with_GP(_svivx)); \
1205 &(((XPVIV*) MUTABLE_PTR(SvANY(_svivx)))->xiv_iv); \
1207 # define SvUVX(sv) \
1208 (*({ const SV *const _svuvx = (const SV *)(sv); \
1209 assert(PL_valid_types_IVX[SvTYPE(_svuvx) & SVt_MASK]); \
1210 assert(!isGV_with_GP(_svuvx)); \
1211 &(((XPVUV*) MUTABLE_PTR(SvANY(_svuvx)))->xuv_uv); \
1213 # define SvNVX(sv) \
1214 (*({ const SV *const _svnvx = (const SV *)(sv); \
1215 assert(PL_valid_types_NVX[SvTYPE(_svnvx) & SVt_MASK]); \
1216 assert(!isGV_with_GP(_svnvx)); \
1217 &(((XPVNV*) MUTABLE_PTR(SvANY(_svnvx)))->xnv_u.xnv_nv); \
1220 (*({ SV *const _svrv = MUTABLE_SV(sv); \
1221 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1222 assert(!isGV_with_GP(_svrv)); \
1223 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1224 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1225 &((_svrv)->sv_u.svu_rv); \
1227 # define SvRV_const(sv) \
1228 ({ const SV *const _svrv = (const SV *)(sv); \
1229 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1230 assert(!isGV_with_GP(_svrv)); \
1231 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1232 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1233 (_svrv)->sv_u.svu_rv; \
1235 # define SvMAGIC(sv) \
1236 (*({ const SV *const _svmagic = (const SV *)(sv); \
1237 assert(SvTYPE(_svmagic) >= SVt_PVMG); \
1238 if(SvTYPE(_svmagic) == SVt_PVMG) \
1239 assert(!SvPAD_OUR(_svmagic)); \
1240 &(((XPVMG*) MUTABLE_PTR(SvANY(_svmagic)))->xmg_u.xmg_magic); \
1242 # define SvSTASH(sv) \
1243 (*({ const SV *const _svstash = (const SV *)(sv); \
1244 assert(SvTYPE(_svstash) >= SVt_PVMG); \
1245 &(((XPVMG*) MUTABLE_PTR(SvANY(_svstash)))->xmg_stash); \
1248 # define SvPVX(sv) ((sv)->sv_u.svu_pv)
1249 # define SvCUR(sv) ((XPV*) SvANY(sv))->xpv_cur
1250 # define SvIVX(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1251 # define SvUVX(sv) ((XPVUV*) SvANY(sv))->xuv_uv
1252 # define SvNVX(sv) ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv
1253 # define SvRV(sv) ((sv)->sv_u.svu_rv)
1254 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1255 # define SvMAGIC(sv) ((XPVMG*) SvANY(sv))->xmg_u.xmg_magic
1256 # define SvSTASH(sv) ((XPVMG*) SvANY(sv))->xmg_stash
1261 /* Given that these two are new, there can't be any existing code using them
1263 # define SvPVX_mutable(sv) (0 + (sv)->sv_u.svu_pv)
1264 # define SvPVX_const(sv) ((const char*)(0 + (sv)->sv_u.svu_pv))
1266 /* Except for the poison code, which uses & to scribble over the pointer after
1267 free() is called. */
1268 # define SvPVX_mutable(sv) ((sv)->sv_u.svu_pv)
1269 # define SvPVX_const(sv) ((const char*)((sv)->sv_u.svu_pv))
1272 #define SvIVXx(sv) SvIVX(sv)
1273 #define SvUVXx(sv) SvUVX(sv)
1274 #define SvNVXx(sv) SvNVX(sv)
1275 #define SvPVXx(sv) SvPVX(sv)
1276 #define SvLENx(sv) SvLEN(sv)
1277 #define SvENDx(sv) ((PL_Sv = (sv)), SvEND(PL_Sv))
1280 /* Ask a scalar nicely to try to become an IV, if possible.
1281 Not guaranteed to stay returning void */
1282 /* Macro won't actually call sv_2iv if already IOK */
1283 #define SvIV_please(sv) \
1284 STMT_START {if (!SvIOKp(sv) && (SvNOK(sv) || SvPOK(sv))) \
1285 (void) SvIV(sv); } STMT_END
1286 #define SvIV_please_nomg(sv) \
1287 (!SvIOKp(sv) && (SvNOK(sv) || SvPOK(sv)) \
1288 ? (SvIV_nomg(sv), SvIOK(sv)) \
1290 #define SvIV_set(sv, val) \
1292 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1293 assert(!isGV_with_GP(sv)); \
1294 (((XPVIV*) SvANY(sv))->xiv_iv = (val)); } STMT_END
1295 #define SvNV_set(sv, val) \
1297 assert(PL_valid_types_NV_set[SvTYPE(sv) & SVt_MASK]); \
1298 assert(!isGV_with_GP(sv)); \
1299 (((XPVNV*)SvANY(sv))->xnv_u.xnv_nv = (val)); } STMT_END
1300 #define SvPV_set(sv, val) \
1302 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1303 assert(!isGV_with_GP(sv)); \
1304 assert(!(SvTYPE(sv) == SVt_PVIO \
1305 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1306 ((sv)->sv_u.svu_pv = (val)); } STMT_END
1307 #define SvUV_set(sv, val) \
1309 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1310 assert(!isGV_with_GP(sv)); \
1311 (((XPVUV*)SvANY(sv))->xuv_uv = (val)); } STMT_END
1312 #define SvRV_set(sv, val) \
1314 assert(PL_valid_types_RV[SvTYPE(sv) & SVt_MASK]); \
1315 assert(!isGV_with_GP(sv)); \
1316 assert(!(SvTYPE(sv) == SVt_PVIO \
1317 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1318 ((sv)->sv_u.svu_rv = (val)); } STMT_END
1319 #define SvMAGIC_set(sv, val) \
1320 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1321 (((XPVMG*)SvANY(sv))->xmg_u.xmg_magic = (val)); } STMT_END
1322 #define SvSTASH_set(sv, val) \
1323 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1324 (((XPVMG*) SvANY(sv))->xmg_stash = (val)); } STMT_END
1325 #define SvCUR_set(sv, val) \
1327 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK] \
1328 || SvTYPE(sv) == SVt_REGEXP); \
1329 assert(!isGV_with_GP(sv)); \
1330 assert(!(SvTYPE(sv) == SVt_PVIO \
1331 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1332 (((XPV*) SvANY(sv))->xpv_cur = (val)); } STMT_END
1333 #define SvLEN_set(sv, val) \
1335 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1336 assert(!isGV_with_GP(sv)); \
1337 assert(!(SvTYPE(sv) == SVt_PVIO \
1338 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1339 (((XPV*) SvANY(sv))->xpv_len = (val)); } STMT_END
1340 #define SvEND_set(sv, val) \
1341 STMT_START { assert(SvTYPE(sv) >= SVt_PV); \
1342 SvCUR_set(sv, (val) - SvPVX(sv)); } STMT_END
1344 #define SvPV_renew(sv,n) \
1345 STMT_START { SvLEN_set(sv, n); \
1346 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
1347 (char*)saferealloc((Malloc_t)SvPVX(sv), \
1348 (MEM_SIZE)((n))))); \
1351 #define SvPV_shrink_to_cur(sv) STMT_START { \
1352 const STRLEN _lEnGtH = SvCUR(sv) + 1; \
1353 SvPV_renew(sv, _lEnGtH); \
1356 #define SvPV_free(sv) \
1358 assert(SvTYPE(sv) >= SVt_PV); \
1360 assert(!SvROK(sv)); \
1363 SvOOK_offset(sv, zok); \
1364 SvPV_set(sv, SvPVX_mutable(sv) - zok); \
1365 SvFLAGS(sv) &= ~SVf_OOK; \
1367 Safefree(SvPVX(sv)); \
1372 /* Code that crops up in three places to take a scalar and ready it to hold
1374 # define prepare_SV_for_RV(sv) \
1376 if (SvTYPE(sv) < SVt_PV && SvTYPE(sv) != SVt_IV) \
1377 sv_upgrade(sv, SVt_IV); \
1378 else if (SvTYPE(sv) >= SVt_PV) { \
1387 # define BmFLAGS(sv) (SvTAIL(sv) ? FBMcf_TAIL : 0)
1390 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1391 # define BmUSEFUL(sv) \
1392 (*({ SV *const _bmuseful = MUTABLE_SV(sv); \
1393 assert(SvTYPE(_bmuseful) >= SVt_PVIV); \
1394 assert(SvVALID(_bmuseful)); \
1395 assert(!SvIOK(_bmuseful)); \
1396 &(((XPVIV*) SvANY(_bmuseful))->xiv_u.xivu_iv); \
1399 # define BmUSEFUL(sv) ((XPVIV*) SvANY(sv))->xiv_u.xivu_iv
1404 # define BmRARE(sv) 0
1405 # define BmPREVIOUS(sv) 0
1408 #define FmLINES(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1410 #define LvTYPE(sv) ((XPVLV*) SvANY(sv))->xlv_type
1411 #define LvTARG(sv) ((XPVLV*) SvANY(sv))->xlv_targ
1412 #define LvTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff
1413 #define LvSTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff_u.xlvu_stargoff
1414 #define LvTARGLEN(sv) ((XPVLV*) SvANY(sv))->xlv_targlen
1415 #define LvFLAGS(sv) ((XPVLV*) SvANY(sv))->xlv_flags
1417 #define IoIFP(sv) (sv)->sv_u.svu_fp
1418 #define IoOFP(sv) ((XPVIO*) SvANY(sv))->xio_ofp
1419 #define IoDIRP(sv) ((XPVIO*) SvANY(sv))->xio_dirp
1420 #define IoANY(sv) ((XPVIO*) SvANY(sv))->xio_any
1421 #define IoLINES(sv) ((XPVIO*) SvANY(sv))->xiv_u.xivu_iv
1422 #define IoPAGE(sv) ((XPVIO*) SvANY(sv))->xio_page
1423 #define IoPAGE_LEN(sv) ((XPVIO*) SvANY(sv))->xio_page_len
1424 #define IoLINES_LEFT(sv)((XPVIO*) SvANY(sv))->xio_lines_left
1425 #define IoTOP_NAME(sv) ((XPVIO*) SvANY(sv))->xio_top_name
1426 #define IoTOP_GV(sv) ((XPVIO*) SvANY(sv))->xio_top_gv
1427 #define IoFMT_NAME(sv) ((XPVIO*) SvANY(sv))->xio_fmt_name
1428 #define IoFMT_GV(sv) ((XPVIO*) SvANY(sv))->xio_fmt_gv
1429 #define IoBOTTOM_NAME(sv)((XPVIO*) SvANY(sv))->xio_bottom_name
1430 #define IoBOTTOM_GV(sv) ((XPVIO*) SvANY(sv))->xio_bottom_gv
1431 #define IoTYPE(sv) ((XPVIO*) SvANY(sv))->xio_type
1432 #define IoFLAGS(sv) ((XPVIO*) SvANY(sv))->xio_flags
1434 /* IoTYPE(sv) is a single character telling the type of I/O connection. */
1435 #define IoTYPE_RDONLY '<'
1436 #define IoTYPE_WRONLY '>'
1437 #define IoTYPE_RDWR '+'
1438 #define IoTYPE_APPEND 'a'
1439 #define IoTYPE_PIPE '|'
1440 #define IoTYPE_STD '-' /* stdin or stdout */
1441 #define IoTYPE_SOCKET 's'
1442 #define IoTYPE_CLOSED ' '
1443 #define IoTYPE_IMPLICIT 'I' /* stdin or stdout or stderr */
1444 #define IoTYPE_NUMERIC '#' /* fdopen */
1447 =for apidoc Am|bool|SvTAINTED|SV* sv
1448 Checks to see if an SV is tainted. Returns TRUE if it is, FALSE if
1451 =for apidoc Am|void|SvTAINTED_on|SV* sv
1452 Marks an SV as tainted if tainting is enabled.
1454 =for apidoc Am|void|SvTAINTED_off|SV* sv
1455 Untaints an SV. Be I<very> careful with this routine, as it short-circuits
1456 some of Perl's fundamental security features. XS module authors should not
1457 use this function unless they fully understand all the implications of
1458 unconditionally untainting the value. Untainting should be done in the
1459 standard perl fashion, via a carefully crafted regexp, rather than directly
1460 untainting variables.
1462 =for apidoc Am|void|SvTAINT|SV* sv
1463 Taints an SV if tainting is enabled, and if some input to the current
1464 expression is tainted--usually a variable, but possibly also implicit
1465 inputs such as locale settings. C<SvTAINT> propagates that taintedness to
1466 the outputs of an expression in a pessimistic fashion; i.e., without paying
1467 attention to precisely which outputs are influenced by which inputs.
1472 #define sv_taint(sv) sv_magic((sv), NULL, PERL_MAGIC_taint, NULL, 0)
1474 #if NO_TAINT_SUPPORT
1475 # define SvTAINTED(sv) 0
1477 # define SvTAINTED(sv) (SvMAGICAL(sv) && sv_tainted(sv))
1479 #define SvTAINTED_on(sv) STMT_START{ if(TAINTING_get){sv_taint(sv);} }STMT_END
1480 #define SvTAINTED_off(sv) STMT_START{ if(TAINTING_get){sv_untaint(sv);} }STMT_END
1482 #define SvTAINT(sv) \
1484 if (TAINTING_get) { \
1491 =for apidoc Am|char*|SvPV_force|SV* sv|STRLEN len
1492 Like C<SvPV> but will force the SV into containing a string (C<SvPOK>), and
1493 only a string (C<SvPOK_only>), by hook or by crook. You need force if you are
1494 going to update the C<SvPVX> directly. Processes get magic.
1496 Note that coercing an arbitrary scalar into a plain PV will potentially
1497 strip useful data from it. For example if the SV was C<SvROK>, then the
1498 referent will have its reference count decremented, and the SV itself may
1499 be converted to an C<SvPOK> scalar with a string buffer containing a value
1500 such as C<"ARRAY(0x1234)">.
1502 =for apidoc Am|char*|SvPV_force_nomg|SV* sv|STRLEN len
1503 Like C<SvPV_force>, but doesn't process get magic.
1505 =for apidoc Am|char*|SvPV|SV* sv|STRLEN len
1506 Returns a pointer to the string in the SV, or a stringified form of
1507 the SV if the SV does not contain a string. The SV may cache the
1508 stringified version becoming C<SvPOK>. Handles 'get' magic. See also
1509 C<SvPVx> for a version which guarantees to evaluate sv only once.
1511 Note that there is no guarantee that the return value of C<SvPV()> is
1512 equal to C<SvPVX(sv)>, or that C<SvPVX(sv)> contains valid data, or that
1513 successive calls to C<SvPV(sv)> will return the same pointer value each
1514 time. This is due to the way that things like overloading and
1515 Copy-On-Write are handled. In these cases, the return value may point to
1516 a temporary buffer or similar. If you absolutely need the SvPVX field to
1517 be valid (for example, if you intend to write to it), then see
1520 =for apidoc Am|char*|SvPVx|SV* sv|STRLEN len
1521 A version of C<SvPV> which guarantees to evaluate C<sv> only once.
1522 Only use this if C<sv> is an expression with side effects, otherwise use the
1523 more efficient C<SvPV>.
1525 =for apidoc Am|char*|SvPV_nomg|SV* sv|STRLEN len
1526 Like C<SvPV> but doesn't process magic.
1528 =for apidoc Am|char*|SvPV_nolen|SV* sv
1529 Like C<SvPV> but doesn't set a length variable.
1531 =for apidoc Am|char*|SvPV_nomg_nolen|SV* sv
1532 Like C<SvPV_nolen> but doesn't process magic.
1534 =for apidoc Am|IV|SvIV|SV* sv
1535 Coerces the given SV to an integer and returns it. See C<SvIVx> for a
1536 version which guarantees to evaluate sv only once.
1538 =for apidoc Am|IV|SvIV_nomg|SV* sv
1539 Like C<SvIV> but doesn't process magic.
1541 =for apidoc Am|IV|SvIVx|SV* sv
1542 Coerces the given SV to an integer 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<SvIV>.
1547 =for apidoc Am|NV|SvNV|SV* sv
1548 Coerce the given SV to a double and return it. See C<SvNVx> for a version
1549 which guarantees to evaluate sv only once.
1551 =for apidoc Am|NV|SvNV_nomg|SV* sv
1552 Like C<SvNV> but doesn't process magic.
1554 =for apidoc Am|NV|SvNVx|SV* sv
1555 Coerces the given SV to a double and returns it.
1556 Guarantees to evaluate C<sv> only once. Only use
1557 this if C<sv> is an expression with side effects,
1558 otherwise use the more efficient C<SvNV>.
1560 =for apidoc Am|UV|SvUV|SV* sv
1561 Coerces the given SV to an unsigned integer and returns it. See C<SvUVx>
1562 for a version which guarantees to evaluate sv only once.
1564 =for apidoc Am|UV|SvUV_nomg|SV* sv
1565 Like C<SvUV> but doesn't process magic.
1567 =for apidoc Am|UV|SvUVx|SV* sv
1568 Coerces the given SV to an unsigned integer and
1569 returns it. Guarantees to evaluate C<sv> only once. Only
1570 use this if C<sv> is an expression with side effects,
1571 otherwise use the more efficient C<SvUV>.
1573 =for apidoc Am|bool|SvTRUE|SV* sv
1574 Returns a boolean indicating whether Perl would evaluate the SV as true or
1575 false. See SvOK() for a defined/undefined test. Handles 'get' magic
1576 unless the scalar is already SvPOK, SvIOK or SvNOK (the public, not the
1579 =for apidoc Am|bool|SvTRUE_nomg|SV* sv
1580 Returns a boolean indicating whether Perl would evaluate the SV as true or
1581 false. See SvOK() for a defined/undefined test. Does not handle 'get' magic.
1583 =for apidoc Am|char*|SvPVutf8_force|SV* sv|STRLEN len
1584 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1586 =for apidoc Am|char*|SvPVutf8|SV* sv|STRLEN len
1587 Like C<SvPV>, but converts sv to utf8 first if necessary.
1589 =for apidoc Am|char*|SvPVutf8_nolen|SV* sv
1590 Like C<SvPV_nolen>, but converts sv to utf8 first if necessary.
1592 =for apidoc Am|char*|SvPVbyte_force|SV* sv|STRLEN len
1593 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1595 =for apidoc Am|char*|SvPVbyte|SV* sv|STRLEN len
1596 Like C<SvPV>, but converts sv to byte representation first if necessary.
1598 =for apidoc Am|char*|SvPVbyte_nolen|SV* sv
1599 Like C<SvPV_nolen>, but converts sv to byte representation first if necessary.
1601 =for apidoc Am|char*|SvPVutf8x_force|SV* sv|STRLEN len
1602 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1603 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8_force>
1606 =for apidoc Am|char*|SvPVutf8x|SV* sv|STRLEN len
1607 Like C<SvPV>, but converts sv to utf8 first if necessary.
1608 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8>
1611 =for apidoc Am|char*|SvPVbytex_force|SV* sv|STRLEN len
1612 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1613 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte_force>
1616 =for apidoc Am|char*|SvPVbytex|SV* sv|STRLEN len
1617 Like C<SvPV>, but converts sv to byte representation first if necessary.
1618 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte>
1621 =for apidoc Am|bool|SvIsCOW|SV* sv
1622 Returns a boolean indicating whether the SV is Copy-On-Write (either shared
1623 hash key scalars, or full Copy On Write scalars if 5.9.0 is configured for
1626 =for apidoc Am|bool|SvIsCOW_shared_hash|SV* sv
1627 Returns a boolean indicating whether the SV is Copy-On-Write shared hash key
1630 =for apidoc Am|void|sv_catpvn_nomg|SV* sv|const char* ptr|STRLEN len
1631 Like C<sv_catpvn> but doesn't process magic.
1633 =for apidoc Am|void|sv_catpv_nomg|SV* sv|const char* ptr
1634 Like C<sv_catpv> but doesn't process magic.
1636 =for apidoc Am|void|sv_setsv_nomg|SV* dsv|SV* ssv
1637 Like C<sv_setsv> but doesn't process magic.
1639 =for apidoc Am|void|sv_catsv_nomg|SV* dsv|SV* ssv
1640 Like C<sv_catsv> but doesn't process magic.
1642 =for apidoc Amdb|STRLEN|sv_utf8_upgrade_nomg|NN SV *sv
1644 Like sv_utf8_upgrade, but doesn't do magic on C<sv>.
1649 /* Let us hope that bitmaps for UV and IV are the same */
1650 #define SvIV(sv) (SvIOK_nog(sv) ? SvIVX(sv) : sv_2iv(sv))
1651 #define SvUV(sv) (SvUOK_nog(sv) ? SvUVX(sv) : sv_2uv(sv))
1652 #define SvNV(sv) (SvNOK_nog(sv) ? SvNVX(sv) : sv_2nv(sv))
1654 #define SvIV_nomg(sv) (SvIOK(sv) ? SvIVX(sv) : sv_2iv_flags(sv, 0))
1655 #define SvUV_nomg(sv) (SvIOK(sv) ? SvUVX(sv) : sv_2uv_flags(sv, 0))
1656 #define SvNV_nomg(sv) (SvNOK(sv) ? SvNVX(sv) : sv_2nv_flags(sv, 0))
1660 #define SvPV(sv, lp) SvPV_flags(sv, lp, SV_GMAGIC)
1661 #define SvPV_const(sv, lp) SvPV_flags_const(sv, lp, SV_GMAGIC)
1662 #define SvPV_mutable(sv, lp) SvPV_flags_mutable(sv, lp, SV_GMAGIC)
1664 #define SvPV_flags(sv, lp, flags) \
1666 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pv_flags(sv, &lp, flags))
1667 #define SvPV_flags_const(sv, lp, flags) \
1669 ? ((lp = SvCUR(sv)), SvPVX_const(sv)) : \
1670 (const char*) sv_2pv_flags(sv, &lp, flags|SV_CONST_RETURN))
1671 #define SvPV_flags_const_nolen(sv, flags) \
1673 ? SvPVX_const(sv) : \
1674 (const char*) sv_2pv_flags(sv, 0, flags|SV_CONST_RETURN))
1675 #define SvPV_flags_mutable(sv, lp, flags) \
1677 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) : \
1678 sv_2pv_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1680 #define SvPV_force(sv, lp) SvPV_force_flags(sv, lp, SV_GMAGIC)
1681 #define SvPV_force_nolen(sv) SvPV_force_flags_nolen(sv, SV_GMAGIC)
1682 #define SvPV_force_mutable(sv, lp) SvPV_force_flags_mutable(sv, lp, SV_GMAGIC)
1684 #define SvPV_force_nomg(sv, lp) SvPV_force_flags(sv, lp, 0)
1685 #define SvPV_force_nomg_nolen(sv) SvPV_force_flags_nolen(sv, 0)
1687 #define SvPV_force_flags(sv, lp, flags) \
1688 (SvPOK_pure_nogthink(sv) \
1689 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvn_force_flags(sv, &lp, flags))
1691 #define SvPV_force_flags_nolen(sv, flags) \
1692 (SvPOK_pure_nogthink(sv) \
1693 ? SvPVX(sv) : sv_pvn_force_flags(sv, 0, flags))
1695 #define SvPV_force_flags_mutable(sv, lp, flags) \
1696 (SvPOK_pure_nogthink(sv) \
1697 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) \
1698 : sv_pvn_force_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1700 #define SvPV_nolen(sv) \
1702 ? SvPVX(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC))
1704 #define SvPV_nomg_nolen(sv) \
1706 ? SvPVX(sv) : sv_2pv_flags(sv, 0, 0))
1708 #define SvPV_nolen_const(sv) \
1710 ? SvPVX_const(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC|SV_CONST_RETURN))
1712 #define SvPV_nomg(sv, lp) SvPV_flags(sv, lp, 0)
1713 #define SvPV_nomg_const(sv, lp) SvPV_flags_const(sv, lp, 0)
1714 #define SvPV_nomg_const_nolen(sv) SvPV_flags_const_nolen(sv, 0)
1718 #define SvPVutf8(sv, lp) \
1719 (SvPOK_utf8_nog(sv) \
1720 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvutf8(sv, &lp))
1722 #define SvPVutf8_force(sv, lp) \
1723 (SvPOK_utf8_pure_nogthink(sv) \
1724 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvutf8n_force(sv, &lp))
1726 #define SvPVutf8_nolen(sv) \
1727 (SvPOK_utf8_nog(sv) \
1728 ? SvPVX(sv) : sv_2pvutf8(sv, 0))
1732 #define SvPVbyte(sv, lp) \
1733 (SvPOK_byte_nog(sv) \
1734 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvbyte(sv, &lp))
1736 #define SvPVbyte_force(sv, lp) \
1737 (SvPOK_byte_pure_nogthink(sv) \
1738 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvbyten_force(sv, &lp))
1740 #define SvPVbyte_nolen(sv) \
1741 (SvPOK_byte_nog(sv) \
1742 ? SvPVX(sv) : sv_2pvbyte(sv, 0))
1745 /* define FOOx(): idempotent versions of FOO(). If possible, use a local
1746 * var to evaluate the arg once; failing that, use a global if possible;
1747 * failing that, call a function to do the work
1750 #define SvPVx_force(sv, lp) sv_pvn_force(sv, &lp)
1751 #define SvPVutf8x_force(sv, lp) sv_pvutf8n_force(sv, &lp)
1752 #define SvPVbytex_force(sv, lp) sv_pvbyten_force(sv, &lp)
1754 #define SvTRUE(sv) ((sv) && (SvGMAGICAL(sv) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv))))
1755 #define SvTRUE_nomg(sv) ((sv) && ( SvTRUE_common(sv, sv_2bool_nomg(sv))))
1756 #define SvTRUE_NN(sv) (SvGMAGICAL(sv) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv)))
1757 #define SvTRUE_nomg_NN(sv) ( SvTRUE_common(sv, sv_2bool_nomg(sv)))
1758 #define SvTRUE_common(sv,fallback) ( \
1763 : (SvFLAGS(sv) & (SVf_IOK|SVf_NOK)) \
1764 ? ( (SvIOK(sv) && SvIVX(sv) != 0) \
1765 || (SvNOK(sv) && SvNVX(sv) != 0.0)) \
1768 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1770 # define SvIVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvIV(_sv); })
1771 # define SvUVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvUV(_sv); })
1772 # define SvNVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvNV(_sv); })
1773 # define SvPVx(sv, lp) ({SV *_sv = (sv); SvPV(_sv, lp); })
1774 # define SvPVx_const(sv, lp) ({SV *_sv = (sv); SvPV_const(_sv, lp); })
1775 # define SvPVx_nolen(sv) ({SV *_sv = (sv); SvPV_nolen(_sv); })
1776 # define SvPVx_nolen_const(sv) ({SV *_sv = (sv); SvPV_nolen_const(_sv); })
1777 # define SvPVutf8x(sv, lp) ({SV *_sv = (sv); SvPVutf8(_sv, lp); })
1778 # define SvPVbytex(sv, lp) ({SV *_sv = (sv); SvPVbyte(_sv, lp); })
1779 # define SvPVbytex_nolen(sv) ({SV *_sv = (sv); SvPVbyte_nolen(_sv); })
1780 # define SvTRUEx(sv) ({SV *_sv = (sv); SvTRUE(_sv); })
1781 # define SvTRUEx_nomg(sv) ({SV *_sv = (sv); SvTRUE_nomg(_sv); })
1783 #else /* __GNUC__ */
1785 /* These inlined macros use globals, which will require a thread
1786 * declaration in user code, so we avoid them under threads */
1788 # define SvIVx(sv) ((PL_Sv = (sv)), SvIV(PL_Sv))
1789 # define SvUVx(sv) ((PL_Sv = (sv)), SvUV(PL_Sv))
1790 # define SvNVx(sv) ((PL_Sv = (sv)), SvNV(PL_Sv))
1791 # define SvPVx(sv, lp) ((PL_Sv = (sv)), SvPV(PL_Sv, lp))
1792 # define SvPVx_const(sv, lp) ((PL_Sv = (sv)), SvPV_const(PL_Sv, lp))
1793 # define SvPVx_nolen(sv) ((PL_Sv = (sv)), SvPV_nolen(PL_Sv))
1794 # define SvPVx_nolen_const(sv) ((PL_Sv = (sv)), SvPV_nolen_const(PL_Sv))
1795 # define SvPVutf8x(sv, lp) ((PL_Sv = (sv)), SvPVutf8(PL_Sv, lp))
1796 # define SvPVbytex(sv, lp) ((PL_Sv = (sv)), SvPVbyte(PL_Sv, lp))
1797 # define SvPVbytex_nolen(sv) ((PL_Sv = (sv)), SvPVbyte_nolen(PL_Sv))
1798 # define SvTRUEx(sv) ((PL_Sv = (sv)), SvTRUE(PL_Sv))
1799 # define SvTRUEx_nomg(sv) ((PL_Sv = (sv)), SvTRUE_nomg(PL_Sv))
1800 #endif /* __GNU__ */
1802 #define SvPVXtrue(sv) ( \
1803 ((XPV*)SvANY((sv))) \
1805 ((XPV*)SvANY((sv)))->xpv_cur > 1 \
1807 ((XPV*)SvANY((sv)))->xpv_cur \
1808 && *(sv)->sv_u.svu_pv != '0' \
1813 #define SvIsCOW(sv) (SvFLAGS(sv) & SVf_IsCOW)
1814 #define SvIsCOW_on(sv) (SvFLAGS(sv) |= SVf_IsCOW)
1815 #define SvIsCOW_off(sv) (SvFLAGS(sv) &= ~SVf_IsCOW)
1816 #define SvIsCOW_shared_hash(sv) (SvIsCOW(sv) && SvLEN(sv) == 0)
1818 #define SvSHARED_HEK_FROM_PV(pvx) \
1819 ((struct hek*)(pvx - STRUCT_OFFSET(struct hek, hek_key)))
1820 #define SvSHARED_HASH(sv) (0 + SvSHARED_HEK_FROM_PV(SvPVX_const(sv))->hek_hash)
1822 /* flag values for sv_*_flags functions */
1823 #define SV_IMMEDIATE_UNREF 1
1825 #define SV_COW_DROP_PV 4
1826 #define SV_UTF8_NO_ENCODING 8
1827 #define SV_NOSTEAL 16
1828 #define SV_CONST_RETURN 32
1829 #define SV_MUTABLE_RETURN 64
1830 #define SV_SMAGIC 128
1831 #define SV_HAS_TRAILING_NUL 256
1832 #define SV_COW_SHARED_HASH_KEYS 512
1833 /* This one is only enabled for PERL_OLD_COPY_ON_WRITE */
1834 #define SV_COW_OTHER_PVS 1024
1835 /* Make sv_2pv_flags return NULL if something is undefined. */
1836 #define SV_UNDEF_RETURNS_NULL 2048
1837 /* Tell sv_utf8_upgrade() to not check to see if an upgrade is really needed.
1838 * This is used when the caller has already determined it is, and avoids
1840 #define SV_FORCE_UTF8_UPGRADE 4096
1841 /* if (after resolving magic etc), the SV is found to be overloaded,
1842 * don't call the overload magic, just return as-is */
1843 #define SV_SKIP_OVERLOAD 8192
1844 /* It is not yet clear whether we want this as an API, or what the
1845 * constants should be named. */
1847 # define SV_CATBYTES 16384
1848 # define SV_CATUTF8 32768
1851 /* The core is safe for this COW optimisation. XS code on CPAN may not be.
1852 So only default to doing the COW setup if we're in the core.
1855 # ifndef SV_DO_COW_SVSETSV
1856 # define SV_DO_COW_SVSETSV SV_COW_SHARED_HASH_KEYS|SV_COW_OTHER_PVS
1860 #ifndef SV_DO_COW_SVSETSV
1861 # define SV_DO_COW_SVSETSV 0
1865 #define sv_unref(sv) sv_unref_flags(sv, 0)
1866 #define sv_force_normal(sv) sv_force_normal_flags(sv, 0)
1867 #define sv_usepvn(sv, p, l) sv_usepvn_flags(sv, p, l, 0)
1868 #define sv_usepvn_mg(sv, p, l) sv_usepvn_flags(sv, p, l, SV_SMAGIC)
1870 /* We are about to replace the SV's current value. So if it's copy on write
1871 we need to normalise it. Use the SV_COW_DROP_PV flag hint to say that
1872 the value is about to get thrown away, so drop the PV rather than go to
1873 the effort of making a read-write copy only for it to get immediately
1876 #define SV_CHECK_THINKFIRST_COW_DROP(sv) if (SvTHINKFIRST(sv)) \
1877 sv_force_normal_flags(sv, SV_COW_DROP_PV)
1879 #ifdef PERL_OLD_COPY_ON_WRITE
1880 #define SvRELEASE_IVX(sv) \
1881 ((SvIsCOW(sv) ? sv_force_normal_flags(sv, 0) : (void) 0), 0)
1882 # define SvIsCOW_normal(sv) (SvIsCOW(sv) && SvLEN(sv))
1883 # define SvRELEASE_IVX_(sv) SvRELEASE_IVX(sv),
1884 # define SvCANCOW(sv) \
1885 (SvIsCOW(sv) || (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS)
1886 /* This is a pessimistic view. Scalar must be purely a read-write PV to copy-
1888 # define CAN_COW_MASK (SVs_OBJECT|SVs_GMG|SVs_SMG|SVs_RMG|SVf_IOK|SVf_NOK| \
1889 SVf_POK|SVf_ROK|SVp_IOK|SVp_NOK|SVp_POK|SVf_FAKE| \
1890 SVf_OOK|SVf_BREAK|SVf_READONLY)
1892 # define SvRELEASE_IVX(sv) 0
1893 /* This little game brought to you by the need to shut this warning up:
1894 mg.c: In function 'Perl_magic_get':
1895 mg.c:1024: warning: left-hand operand of comma expression has no effect
1897 # define SvRELEASE_IVX_(sv) /**/
1898 # ifdef PERL_NEW_COPY_ON_WRITE
1899 # define SvCANCOW(sv) \
1901 ? SvLEN(sv) ? CowREFCNT(sv) != SV_COW_REFCNT_MAX : 1 \
1902 : (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS \
1903 && SvCUR(sv)+1 < SvLEN(sv))
1904 /* Note: To allow 256 COW "copies", a refcnt of 0 means 1. */
1905 # define CowREFCNT(sv) (*(U8 *)(SvPVX(sv)+SvLEN(sv)-1))
1906 # define SV_COW_REFCNT_MAX ((1 << sizeof(U8)*8) - 1)
1907 # ifndef SV_COW_THRESHOLD
1908 # define SV_COW_THRESHOLD 0 /* min string length for cow */
1910 # ifndef SV_COWBUF_THRESHOLD
1911 # define SV_COWBUF_THRESHOLD 1250 /* min string length for cow */
1912 # endif /* over existing buffer */
1913 # define CAN_COW_MASK (SVf_POK|SVf_ROK|SVp_POK|SVf_FAKE| \
1914 SVf_OOK|SVf_BREAK|SVf_READONLY)
1916 #endif /* PERL_OLD_COPY_ON_WRITE */
1918 #define CAN_COW_FLAGS (SVp_POK|SVf_POK)
1920 #define SV_CHECK_THINKFIRST(sv) if (SvTHINKFIRST(sv)) \
1921 sv_force_normal_flags(sv, 0)
1924 /* all these 'functions' are now just macros */
1926 #define sv_pv(sv) SvPV_nolen(sv)
1927 #define sv_pvutf8(sv) SvPVutf8_nolen(sv)
1928 #define sv_pvbyte(sv) SvPVbyte_nolen(sv)
1930 #define sv_pvn_force_nomg(sv, lp) sv_pvn_force_flags(sv, lp, 0)
1931 #define sv_utf8_upgrade_flags(sv, flags) sv_utf8_upgrade_flags_grow(sv, flags, 0)
1932 #define sv_utf8_upgrade_nomg(sv) sv_utf8_upgrade_flags(sv, 0)
1933 #define sv_catpvn_nomg(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, 0)
1934 #define sv_catpv_nomg(dsv, sstr) sv_catpv_flags(dsv, sstr, 0)
1935 #define sv_setsv(dsv, ssv) \
1936 sv_setsv_flags(dsv, ssv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1937 #define sv_setsv_nomg(dsv, ssv) sv_setsv_flags(dsv, ssv, SV_DO_COW_SVSETSV)
1938 #define sv_catsv(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC)
1939 #define sv_catsv_nomg(dsv, ssv) sv_catsv_flags(dsv, ssv, 0)
1940 #define sv_catsv_mg(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC|SV_SMAGIC)
1941 #define sv_catpvn(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, SV_GMAGIC)
1942 #define sv_catpvn_mg(sv, sstr, slen) sv_catpvn_flags(sv, sstr, slen, SV_GMAGIC|SV_SMAGIC);
1943 #define sv_copypv(dsv, ssv) sv_copypv_flags(dsv, ssv, SV_GMAGIC)
1944 #define sv_copypv_nomg(dsv, ssv) sv_copypv_flags(dsv, ssv, 0)
1945 #define sv_2pv(sv, lp) sv_2pv_flags(sv, lp, SV_GMAGIC)
1946 #define sv_2pv_nolen(sv) sv_2pv(sv, 0)
1947 #define sv_2pvbyte_nolen(sv) sv_2pvbyte(sv, 0)
1948 #define sv_2pvutf8_nolen(sv) sv_2pvutf8(sv, 0)
1949 #define sv_2pv_nomg(sv, lp) sv_2pv_flags(sv, lp, 0)
1950 #define sv_pvn_force(sv, lp) sv_pvn_force_flags(sv, lp, SV_GMAGIC)
1951 #define sv_utf8_upgrade(sv) sv_utf8_upgrade_flags(sv, SV_GMAGIC)
1952 #define sv_2iv(sv) sv_2iv_flags(sv, SV_GMAGIC)
1953 #define sv_2uv(sv) sv_2uv_flags(sv, SV_GMAGIC)
1954 #define sv_2nv(sv) sv_2nv_flags(sv, SV_GMAGIC)
1955 #define sv_eq(sv1, sv2) sv_eq_flags(sv1, sv2, SV_GMAGIC)
1956 #define sv_cmp(sv1, sv2) sv_cmp_flags(sv1, sv2, SV_GMAGIC)
1957 #define sv_cmp_locale(sv1, sv2) sv_cmp_locale_flags(sv1, sv2, SV_GMAGIC)
1958 #define sv_collxfrm(sv, nxp) sv_cmp_flags(sv, nxp, SV_GMAGIC)
1959 #define sv_2bool(sv) sv_2bool_flags(sv, SV_GMAGIC)
1960 #define sv_2bool_nomg(sv) sv_2bool_flags(sv, 0)
1961 #define sv_insert(bigstr, offset, len, little, littlelen) \
1962 Perl_sv_insert_flags(aTHX_ (bigstr),(offset), (len), (little), \
1963 (littlelen), SV_GMAGIC)
1964 #define sv_mortalcopy(sv) \
1965 Perl_sv_mortalcopy_flags(aTHX_ sv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1967 /* Should be named SvCatPVN_utf8_upgrade? */
1968 #define sv_catpvn_nomg_utf8_upgrade(dsv, sstr, slen, nsv) \
1971 nsv = newSVpvn_flags(sstr, slen, SVs_TEMP); \
1973 sv_setpvn(nsv, sstr, slen); \
1975 sv_utf8_upgrade(nsv); \
1976 sv_catsv_nomg(dsv, nsv); \
1978 #define sv_catpvn_nomg_maybeutf8(dsv, sstr, slen, is_utf8) \
1979 sv_catpvn_flags(dsv, sstr, slen, (is_utf8)?SV_CATUTF8:SV_CATBYTES)
1981 #if defined(PERL_CORE) || defined(PERL_EXT)
1982 # define sv_or_pv_len_utf8(sv, pv, bytelen) \
1984 ? utf8_length((U8 *)(pv), (U8 *)(pv)+(bytelen)) \
1989 =for apidoc Am|SV*|newRV_inc|SV* sv
1991 Creates an RV wrapper for an SV. The reference count for the original SV is
1997 #define newRV_inc(sv) newRV(sv)
1999 /* the following macros update any magic values this sv is associated with */
2002 =head1 Magical Functions
2004 =for apidoc Am|void|SvGETMAGIC|SV* sv
2005 Invokes C<mg_get> on an SV if it has 'get' magic. For example, this
2006 will call C<FETCH> on a tied variable. This macro evaluates its
2007 argument more than once.
2009 =for apidoc Am|void|SvSETMAGIC|SV* sv
2010 Invokes C<mg_set> on an SV if it has 'set' magic. This is necessary
2011 after modifying a scalar, in case it is a magical variable like C<$|>
2012 or a tied variable (it calls C<STORE>). This macro evaluates its
2013 argument more than once.
2015 =for apidoc Am|void|SvSetSV|SV* dsb|SV* ssv
2016 Calls C<sv_setsv> if dsv is not the same as ssv. May evaluate arguments
2019 =for apidoc Am|void|SvSetSV_nosteal|SV* dsv|SV* ssv
2020 Calls a non-destructive version of C<sv_setsv> if dsv is not the same as
2021 ssv. May evaluate arguments more than once.
2023 =for apidoc Am|void|SvSetMagicSV|SV* dsb|SV* ssv
2024 Like C<SvSetSV>, but does any set magic required afterwards.
2026 =for apidoc Am|void|SvSetMagicSV_nosteal|SV* dsv|SV* ssv
2027 Like C<SvSetSV_nosteal>, but does any set magic required afterwards.
2029 =for apidoc Am|void|SvSHARE|SV* sv
2030 Arranges for sv to be shared between threads if a suitable module
2033 =for apidoc Am|void|SvLOCK|SV* sv
2034 Arranges for a mutual exclusion lock to be obtained on sv if a suitable module
2037 =for apidoc Am|void|SvUNLOCK|SV* sv
2038 Releases a mutual exclusion lock on sv if a suitable module
2041 =head1 SV Manipulation Functions
2043 =for apidoc Am|char *|SvGROW|SV* sv|STRLEN len
2044 Expands the character buffer in the SV so that it has room for the
2045 indicated number of bytes (remember to reserve space for an extra trailing
2046 NUL character). Calls C<sv_grow> to perform the expansion if necessary.
2047 Returns a pointer to the character buffer. SV must be of type >= SVt_PV. One
2048 alternative is to call C<sv_grow> if you are not sure of the type of SV.
2053 #define SvSHARE(sv) PL_sharehook(aTHX_ sv)
2054 #define SvLOCK(sv) PL_lockhook(aTHX_ sv)
2055 #define SvUNLOCK(sv) PL_unlockhook(aTHX_ sv)
2056 #define SvDESTROYABLE(sv) PL_destroyhook(aTHX_ sv)
2058 #define SvGETMAGIC(x) ((void)(SvGMAGICAL(x) && mg_get(x)))
2059 #define SvSETMAGIC(x) STMT_START { if (SvSMAGICAL(x)) mg_set(x); } STMT_END
2061 #define SvSetSV_and(dst,src,finally) \
2063 if ((dst) != (src)) { \
2064 sv_setsv(dst, src); \
2068 #define SvSetSV_nosteal_and(dst,src,finally) \
2070 if ((dst) != (src)) { \
2071 sv_setsv_flags(dst, src, SV_GMAGIC | SV_NOSTEAL | SV_DO_COW_SVSETSV); \
2076 #define SvSetSV(dst,src) \
2077 SvSetSV_and(dst,src,/*nothing*/;)
2078 #define SvSetSV_nosteal(dst,src) \
2079 SvSetSV_nosteal_and(dst,src,/*nothing*/;)
2081 #define SvSetMagicSV(dst,src) \
2082 SvSetSV_and(dst,src,SvSETMAGIC(dst))
2083 #define SvSetMagicSV_nosteal(dst,src) \
2084 SvSetSV_nosteal_and(dst,src,SvSETMAGIC(dst))
2087 #if !defined(SKIP_DEBUGGING)
2088 #define SvPEEK(sv) sv_peek(sv)
2090 #define SvPEEK(sv) ""
2093 #define SvIMMORTAL(sv) (SvREADONLY(sv) && ((sv)==&PL_sv_undef || (sv)==&PL_sv_yes || (sv)==&PL_sv_no || (sv)==&PL_sv_placeholder))
2096 /* exercise the immortal resurrection code in sv_free2() */
2097 # define SvREFCNT_IMMORTAL 1000
2099 # define SvREFCNT_IMMORTAL ((~(U32)0)/2)
2103 =for apidoc Am|SV *|boolSV|bool b
2105 Returns a true SV if C<b> is a true value, or a false SV if C<b> is 0.
2107 See also C<PL_sv_yes> and C<PL_sv_no>.
2112 #define boolSV(b) ((b) ? &PL_sv_yes : &PL_sv_no)
2114 #define isGV(sv) (SvTYPE(sv) == SVt_PVGV)
2115 /* If I give every macro argument a different name, then there won't be bugs
2116 where nested macros get confused. Been there, done that. */
2117 #define isGV_with_GP(pwadak) \
2118 (((SvFLAGS(pwadak) & (SVp_POK|SVpgv_GP)) == SVpgv_GP) \
2119 && (SvTYPE(pwadak) == SVt_PVGV || SvTYPE(pwadak) == SVt_PVLV))
2120 #define isGV_with_GP_on(sv) STMT_START { \
2121 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2122 assert (!SvPOKp(sv)); \
2123 assert (!SvIOKp(sv)); \
2124 (SvFLAGS(sv) |= SVpgv_GP); \
2126 #define isGV_with_GP_off(sv) STMT_START { \
2127 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2128 assert (!SvPOKp(sv)); \
2129 assert (!SvIOKp(sv)); \
2130 (SvFLAGS(sv) &= ~SVpgv_GP); \
2132 #define isREGEXP(sv) \
2133 (SvTYPE(sv) == SVt_REGEXP \
2134 || (SvFLAGS(sv) & (SVTYPEMASK|SVp_POK|SVpgv_GP|SVf_FAKE)) \
2135 == (SVt_PVLV|SVf_FAKE))
2138 #ifdef PERL_NEW_COPY_ON_WRITE
2139 # define SvGROW(sv,len) \
2140 (SvIsCOW(sv) || SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2142 # define SvGROW(sv,len) (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2144 #define SvGROW_mutable(sv,len) \
2145 (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX_mutable(sv))
2146 #define Sv_Grow sv_grow
2148 #define CLONEf_COPY_STACKS 1
2149 #define CLONEf_KEEP_PTR_TABLE 2
2150 #define CLONEf_CLONE_HOST 4
2151 #define CLONEf_JOIN_IN 8
2153 struct clone_params {
2156 PerlInterpreter *proto_perl;
2157 PerlInterpreter *new_perl;
2162 =for apidoc Am|SV*|newSVpvn_utf8|NULLOK const char* s|STRLEN len|U32 utf8
2164 Creates a new SV and copies a string into it. If utf8 is true, calls
2165 C<SvUTF8_on> on the new SV. Implemented as a wrapper around C<newSVpvn_flags>.
2170 #define newSVpvn_utf8(s, len, u) newSVpvn_flags((s), (len), (u) ? SVf_UTF8 : 0)
2173 =for apidoc Amx|SV*|newSVpadname|PADNAME *pn
2175 Creates a new SV containing the pad name. This is currently identical
2176 to C<newSVsv>, but pad names may cease being SVs at some point, so
2177 C<newSVpadname> is preferable.
2182 #define newSVpadname(pn) newSVsv(pn)
2185 =for apidoc Am|void|SvOOK_offset|NN SV*sv|STRLEN len
2187 Reads into I<len> the offset from SvPVX back to the true start of the
2188 allocated buffer, which will be non-zero if C<sv_chop> has been used to
2189 efficiently remove characters from start of the buffer. Implemented as a
2190 macro, which takes the address of I<len>, which must be of type C<STRLEN>.
2191 Evaluates I<sv> more than once. Sets I<len> to 0 if C<SvOOK(sv)> is false.
2197 /* Does the bot know something I don't?
2198 10:28 <@Nicholas> metabatman
2199 10:28 <+meta> Nicholas: crash
2201 # define SvOOK_offset(sv, offset) STMT_START { \
2202 assert(sizeof(offset) == sizeof(STRLEN)); \
2204 const U8 *_crash = (U8*)SvPVX_const(sv); \
2205 (offset) = *--_crash; \
2207 _crash -= sizeof(STRLEN); \
2208 Copy(_crash, (U8 *)&(offset), sizeof(STRLEN), U8); \
2211 /* Validate the preceding buffer's sentinels to \
2212 verify that no-one is using it. */ \
2213 const U8 *const _bonk = (U8*)SvPVX_const(sv) - (offset);\
2214 while (_crash > _bonk) { \
2216 assert (*_crash == (U8)PTR2UV(_crash)); \
2224 /* This is the same code, but avoids using any temporary variables: */
2225 # define SvOOK_offset(sv, offset) STMT_START { \
2226 assert(sizeof(offset) == sizeof(STRLEN)); \
2228 (offset) = ((U8*)SvPVX_const(sv))[-1]; \
2230 Copy(SvPVX_const(sv) - 1 - sizeof(STRLEN), \
2231 (U8*)&(offset), sizeof(STRLEN), U8); \
2239 #define newIO() MUTABLE_IO(newSV_type(SVt_PVIO))
2241 #define SV_CONST(name) \
2242 PL_sv_consts[SV_CONST_##name] \
2243 ? PL_sv_consts[SV_CONST_##name] \
2244 : (PL_sv_consts[SV_CONST_##name] = newSVpv_share(#name, 0))
2246 #define SV_CONST_TIESCALAR 0
2247 #define SV_CONST_TIEARRAY 1
2248 #define SV_CONST_TIEHASH 2
2249 #define SV_CONST_TIEHANDLE 3
2251 #define SV_CONST_FETCH 4
2252 #define SV_CONST_FETCHSIZE 5
2253 #define SV_CONST_STORE 6
2254 #define SV_CONST_STORESIZE 7
2255 #define SV_CONST_EXISTS 8
2257 #define SV_CONST_PUSH 9
2258 #define SV_CONST_POP 10
2259 #define SV_CONST_SHIFT 11
2260 #define SV_CONST_UNSHIFT 12
2261 #define SV_CONST_SPLICE 13
2262 #define SV_CONST_EXTEND 14
2264 #define SV_CONST_FIRSTKEY 15
2265 #define SV_CONST_NEXTKEY 16
2266 #define SV_CONST_SCALAR 17
2268 #define SV_CONST_OPEN 18
2269 #define SV_CONST_WRITE 19
2270 #define SV_CONST_PRINT 20
2271 #define SV_CONST_PRINTF 21
2272 #define SV_CONST_READ 22
2273 #define SV_CONST_READLINE 23
2274 #define SV_CONST_GETC 24
2275 #define SV_CONST_SEEK 25
2276 #define SV_CONST_TELL 26
2277 #define SV_CONST_EOF 27
2278 #define SV_CONST_BINMODE 28
2279 #define SV_CONST_FILENO 29
2280 #define SV_CONST_CLOSE 30
2282 #define SV_CONST_DELETE 31
2283 #define SV_CONST_CLEAR 32
2284 #define SV_CONST_UNTIE 33
2285 #define SV_CONST_DESTROY 34
2287 #define SV_CONSTS_COUNT 35
2291 * c-indentation-style: bsd
2293 * indent-tabs-mode: nil
2296 * ex: set ts=8 sts=4 sw=4 et: