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.
22 =for apidoc AmU||SVt_PV
23 Pointer type flag for scalars. See C<svtype>.
25 =for apidoc AmU||SVt_IV
26 Integer type flag for scalars. See C<svtype>.
28 =for apidoc AmU||SVt_NV
29 Double type flag for scalars. See C<svtype>.
31 =for apidoc AmU||SVt_PVMG
32 Type flag for blessed scalars. See C<svtype>.
34 =for apidoc AmU||SVt_PVAV
35 Type flag for arrays. See C<svtype>.
37 =for apidoc AmU||SVt_PVHV
38 Type flag for hashes. See C<svtype>.
40 =for apidoc AmU||SVt_PVCV
41 Type flag for code refs. See C<svtype>.
51 /* RV was here, before it was merged with IV. */
57 /* PVBM was here, before BIND replaced it. */
65 SVt_LAST /* keep last in enum. used to size arrays */
68 /* *** any alterations to the SV types above need to be reflected in
69 * SVt_MASK and the various PL_valid_types_* tables */
71 #define SVt_MASK 0xf /* smallest bitmask that covers all types */
74 /* Although Fast Boyer Moore tables are now being stored in PVGVs, for most
75 purposes eternal code wanting to consider PVBM probably needs to think of
77 # define SVt_PVBM SVt_PVMG
78 /* Anything wanting to create a reference from clean should ensure that it has
79 a scalar of type SVt_IV now: */
80 # define SVt_RV SVt_IV
83 /* There is collusion here with sv_clear - sv_clear exits early for SVt_NULL
84 so never reaches the clause at the end that uses sv_type_details->body_size
85 to determine whether to call safefree(). Hence body_size can be set
86 non-zero to record the size of HEs, without fear of bogus frees. */
87 #if defined(PERL_IN_HV_C) || defined(PERL_IN_XS_APITEST)
88 #define HE_SVSLOT SVt_NULL
91 #define PERL_ARENA_ROOTS_SIZE (SVt_LAST)
93 /* typedefs to eliminate some typing */
95 typedef struct hek HEK;
97 /* Using C's structural equivalence to help emulate C++ inheritance here... */
99 /* start with 2 sv-head building blocks */
100 #define _SV_HEAD(ptrtype) \
101 ptrtype sv_any; /* pointer to body */ \
102 U32 sv_refcnt; /* how many references to us */ \
103 U32 sv_flags /* what we are */
105 #define _SV_HEAD_UNION \
107 char* svu_pv; /* pointer to malloced string */ \
110 SV* svu_rv; /* pointer to another SV */ \
118 struct STRUCT_SV { /* struct sv { */
121 #ifdef DEBUG_LEAKING_SCALARS
122 PERL_BITFIELD32 sv_debug_optype:9; /* the type of OP that allocated us */
123 PERL_BITFIELD32 sv_debug_inpad:1; /* was allocated in a pad for an OP */
124 PERL_BITFIELD32 sv_debug_line:16; /* the line where we were allocated */
125 UV sv_debug_serial; /* serial number of sv allocation */
126 char * sv_debug_file; /* the file where we were allocated */
127 SV * sv_debug_parent; /* what we were cloned from (ithreads)*/
132 _SV_HEAD(XPVGV*); /* pointer to xpvgv body */
137 _SV_HEAD(XPVCV*); /* pointer to xpvcv body */
142 _SV_HEAD(XPVAV*); /* pointer to xpvav body */
147 _SV_HEAD(XPVHV*); /* pointer to xpvhv body */
152 _SV_HEAD(XPVIO*); /* pointer to xpvio body */
157 _SV_HEAD(struct regexp*); /* pointer to regexp body */
162 #undef _SV_HEAD_UNION /* ensure no pollution */
165 =head1 SV Manipulation Functions
167 =for apidoc Am|U32|SvREFCNT|SV* sv
168 Returns the value of the object's reference count.
170 =for apidoc Am|SV*|SvREFCNT_inc|SV* sv
171 Increments the reference count of the given SV.
173 All of the following SvREFCNT_inc* macros are optimized versions of
174 SvREFCNT_inc, and can be replaced with SvREFCNT_inc.
176 =for apidoc Am|SV*|SvREFCNT_inc_NN|SV* sv
177 Same as SvREFCNT_inc, but can only be used if you know I<sv>
178 is not NULL. Since we don't have to check the NULLness, it's faster
181 =for apidoc Am|void|SvREFCNT_inc_void|SV* sv
182 Same as SvREFCNT_inc, but can only be used if you don't need the
183 return value. The macro doesn't need to return a meaningful value.
185 =for apidoc Am|void|SvREFCNT_inc_void_NN|SV* sv
186 Same as SvREFCNT_inc, but can only be used if you don't need the return
187 value, and you know that I<sv> is not NULL. The macro doesn't need
188 to return a meaningful value, or check for NULLness, so it's smaller
191 =for apidoc Am|SV*|SvREFCNT_inc_simple|SV* sv
192 Same as SvREFCNT_inc, but can only be used with expressions without side
193 effects. Since we don't have to store a temporary value, it's faster.
195 =for apidoc Am|SV*|SvREFCNT_inc_simple_NN|SV* sv
196 Same as SvREFCNT_inc_simple, but can only be used if you know I<sv>
197 is not NULL. Since we don't have to check the NULLness, it's faster
200 =for apidoc Am|void|SvREFCNT_inc_simple_void|SV* sv
201 Same as SvREFCNT_inc_simple, but can only be used if you don't need the
202 return value. The macro doesn't need to return a meaningful value.
204 =for apidoc Am|void|SvREFCNT_inc_simple_void_NN|SV* sv
205 Same as SvREFCNT_inc, but can only be used if you don't need the return
206 value, and you know that I<sv> is not NULL. The macro doesn't need
207 to return a meaningful value, or check for NULLness, so it's smaller
210 =for apidoc Am|void|SvREFCNT_dec|SV* sv
211 Decrements the reference count of the given SV.
213 =for apidoc Am|svtype|SvTYPE|SV* sv
214 Returns the type of the SV. See C<svtype>.
216 =for apidoc Am|void|SvUPGRADE|SV* sv|svtype type
217 Used to upgrade an SV to a more complex form. Uses C<sv_upgrade> to
218 perform the upgrade if necessary. See C<svtype>.
223 #define SvANY(sv) (sv)->sv_any
224 #define SvFLAGS(sv) (sv)->sv_flags
225 #define SvREFCNT(sv) (sv)->sv_refcnt
227 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
228 # define SvREFCNT_inc(sv) \
230 SV * const _sv = MUTABLE_SV(sv); \
235 # define SvREFCNT_inc_simple(sv) \
241 # define SvREFCNT_inc_NN(sv) \
243 SV * const _sv = MUTABLE_SV(sv); \
247 # define SvREFCNT_inc_void(sv) \
249 SV * const _sv = MUTABLE_SV(sv); \
251 (void)(SvREFCNT(_sv)++); \
254 # define SvREFCNT_inc(sv) \
255 ((PL_Sv=MUTABLE_SV(sv)) ? (++(SvREFCNT(PL_Sv)),PL_Sv) : NULL)
256 # define SvREFCNT_inc_simple(sv) \
257 ((sv) ? (SvREFCNT(sv)++,MUTABLE_SV(sv)) : NULL)
258 # define SvREFCNT_inc_NN(sv) \
259 (PL_Sv=MUTABLE_SV(sv),++(SvREFCNT(PL_Sv)),PL_Sv)
260 # define SvREFCNT_inc_void(sv) \
261 (void)((PL_Sv=MUTABLE_SV(sv)) ? ++(SvREFCNT(PL_Sv)) : 0)
264 /* These guys don't need the curly blocks */
265 #define SvREFCNT_inc_simple_void(sv) STMT_START { if (sv) SvREFCNT(sv)++; } STMT_END
266 #define SvREFCNT_inc_simple_NN(sv) (++(SvREFCNT(sv)),MUTABLE_SV(sv))
267 #define SvREFCNT_inc_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
268 #define SvREFCNT_inc_simple_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
270 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
271 # define SvREFCNT_dec(sv) \
273 SV * const _sv = MUTABLE_SV(sv); \
275 if (SvREFCNT(_sv)) { \
276 if (--(SvREFCNT(_sv)) == 0) \
277 Perl_sv_free2(aTHX_ _sv); \
284 #define SvREFCNT_dec(sv) sv_free(MUTABLE_SV(sv))
287 #define SVTYPEMASK 0xff
288 #define SvTYPE(sv) ((svtype)((sv)->sv_flags & SVTYPEMASK))
290 /* Sadly there are some parts of the core that have pointers to already-freed
291 SV heads, and rely on being able to tell that they are now free. So mark
292 them all by using a consistent macro. */
293 #define SvIS_FREED(sv) ((sv)->sv_flags == SVTYPEMASK)
295 #define SvUPGRADE(sv, mt) (SvTYPE(sv) >= (mt) || (sv_upgrade(sv, mt), 1))
297 #define SVf_IOK 0x00000100 /* has valid public integer value */
298 #define SVf_NOK 0x00000200 /* has valid public numeric value */
299 #define SVf_POK 0x00000400 /* has valid public pointer value */
300 #define SVf_ROK 0x00000800 /* has a valid reference pointer */
302 #define SVp_IOK 0x00001000 /* has valid non-public integer value */
303 #define SVp_NOK 0x00002000 /* has valid non-public numeric value */
304 #define SVp_POK 0x00004000 /* has valid non-public pointer value */
305 #define SVp_SCREAM 0x00008000 /* method name is DOES */
306 #define SVphv_CLONEABLE SVp_SCREAM /* PVHV (stashes) clone its objects */
307 #define SVpgv_GP SVp_SCREAM /* GV has a valid GP */
308 #define SVprv_PCS_IMPORTED SVp_SCREAM /* RV is a proxy for a constant
309 subroutine in another package. Set the
310 GvIMPORTED_CV_on() if it needs to be
311 expanded to a real GV */
312 /* 0x00010000 *** FREE SLOT */
313 #define SVs_PADTMP 0x00020000 /* in use as tmp; only if ! SVs_PADMY */
314 #define SVs_PADSTALE 0x00020000 /* lexical has gone out of scope;
315 only valid for SVs_PADMY */
316 #define SVpad_TYPED 0x00020000 /* pad name is a Typed Lexical */
317 #define SVs_PADMY 0x00040000 /* in use a "my" variable */
318 #define SVpad_OUR 0x00040000 /* pad name is "our" instead of "my" */
319 #define SVs_TEMP 0x00080000 /* string is stealable? */
320 #define SVs_OBJECT 0x00100000 /* is "blessed" */
321 #define SVs_GMG 0x00200000 /* has magical get method */
322 #define SVs_SMG 0x00400000 /* has magical set method */
323 #define SVs_RMG 0x00800000 /* has random magical methods */
325 #define SVf_FAKE 0x01000000 /* 0: glob is just a copy
326 1: SV head arena wasn't malloc()ed
327 2: in conjunction with SVf_READONLY
328 marks a shared hash key scalar
329 (SvLEN == 0) or a copy on write
330 string (SvLEN != 0) [SvIsCOW(sv)]
331 3: For PVCV, whether CvUNIQUE(cv)
332 refers to an eval or once only
333 [CvEVAL(cv), CvSPECIAL(cv)]
334 4: On a pad name SV, that slot in the
335 frame AV is a REFCNT'ed reference
336 to a lexical from "outside". */
337 #define SVphv_REHASH SVf_FAKE /* 5: On a PVHV, hash values are being
339 #define SVf_OOK 0x02000000 /* has valid offset value. For a PVHV this
340 means that a hv_aux struct is present
341 after the main array */
342 #define SVf_BREAK 0x04000000 /* refcnt is artificially low - used by
343 SVs in final arena cleanup.
344 Set in S_regtry on PL_reg_curpm, so that
345 perl_destruct will skip it. */
346 #define SVf_READONLY 0x08000000 /* may not be modified */
351 #define SVf_THINKFIRST (SVf_READONLY|SVf_ROK|SVf_FAKE|SVs_RMG)
353 #define SVf_OK (SVf_IOK|SVf_NOK|SVf_POK|SVf_ROK| \
354 SVp_IOK|SVp_NOK|SVp_POK|SVpgv_GP)
356 #define PRIVSHIFT 4 /* (SVp_?OK >> PRIVSHIFT) == SVf_?OK */
358 #define SVf_AMAGIC 0x10000000 /* has magical overloaded methods */
360 /* Ensure this value does not clash with the GV_ADD* flags in gv.h: */
361 #define SVf_UTF8 0x20000000 /* SvPV is UTF-8 encoded
362 This is also set on RVs whose overloaded
363 stringification is UTF-8. This might
364 only happen as a side effect of SvPV() */
367 /* Some private flags. */
369 /* PVAV could probably use 0x2000000 without conflict. I assume that PVFM can
370 be UTF-8 encoded, and PVCVs could well have UTF-8 prototypes. PVIOs haven't
371 been restructured, so sometimes get used as string buffers. */
374 #define SVphv_SHAREKEYS 0x20000000 /* PVHV keys live on shared string table */
376 /* PVNV, PVMG only, and only used in pads. Should be safe to test on any scalar
377 SV, as the core is careful to avoid setting both.
379 SVf_POK, SVp_POK also set:
381 0x0000C400 method name for DOES (SvSCREAM)
382 0x40004400 FBM compiled (SvVALID)
385 0x00008000 GV with GP
386 0x00008800 RV with PCS imported
388 #define SVpad_NAME (SVp_SCREAM|SVpbm_VALID)
389 /* This SV is a name in the PAD, so
390 SVpad_TYPED, SVpad_OUR and SVpad_STATE
393 #define SVpav_REAL 0x40000000 /* free old entries */
395 #define SVphv_LAZYDEL 0x40000000 /* entry in xhv_eiter must be deleted */
396 /* This is only set true on a PVGV when it's playing "PVBM", but is tested for
397 on any regular scalar (anything <= PVLV) */
398 #define SVpbm_VALID 0x40000000
399 /* Only used in toke.c on an SV stored in PL_lex_repl */
400 #define SVrepl_EVAL 0x40000000 /* Replacement part of s///e */
402 /* IV, PVIV, PVNV, PVMG, PVGV and (I assume) PVLV */
403 #define SVf_IVisUV 0x80000000 /* use XPVUV instead of XPVIV */
405 #define SVpav_REIFY 0x80000000 /* can become real */
407 #define SVphv_HASKFLAGS 0x80000000 /* keys have flag byte after hash */
408 /* PVGV when SVpbm_VALID is true */
409 #define SVpbm_TAIL 0x80000000
410 /* RV upwards. However, SVf_ROK and SVp_IOK are exclusive */
411 #define SVprv_WEAKREF 0x80000000 /* Weak reference */
412 /* pad name vars only */
413 #define SVpad_STATE 0x80000000 /* pad name is a "state" var */
415 /* MSVC6 generates "error C2099: initializer is not a constant" when
416 * initializing bodies_by_type in sv.c. Workaround the compiler bug by
417 * using an anonymous union, but only for MSVC6 since that isn't C89.
419 #if defined(_MSC_VER) && _MSC_VER < 1300
421 HV* xmg_stash; /* class package */ \
424 STRLEN xpvcuru_cur; /* length of svu_pv as a C string */ \
425 I32 xpvcuru_fmdepth; \
427 STRLEN xpv_len /* allocated size */
430 HV* xmg_stash; /* class package */ \
433 STRLEN xpvcuru_cur; /* length of svu_pv as a C string */ \
434 I32 xpvcuru_fmdepth; \
436 STRLEN xpv_len /* allocated size */
439 #if defined(_MSC_VER) && _MSC_VER < 1300
440 #define xpv_cur xpvcuru_cur
442 #define xpv_cur xpv_cur_u.xpvcuru_cur
446 NV xnv_nv; /* numeric value, if any */
451 } xpad_cop_seq; /* used by pad.c for cop_sequence */
454 U8 xbm_rare; /* rarest character in string */
455 } xbm_s; /* fields from PVBM */
459 IV xivu_iv; /* integer value */
461 HEK * xivu_namehek; /* xpvlv, xpvgv: GvNAME */
465 MAGIC* xmg_magic; /* linked list of magicalness */
466 HV* xmg_ourstash; /* Stash for our (when SvPAD_OUR is true) */
467 STRLEN xmg_hash_index; /* used while freeing hash entries */
479 #define xiv_iv xiv_u.xivu_iv
486 #define xuv_uv xuv_u.xivu_uv
494 /* This structure must match the beginning of struct xpvhv in hv.h. */
508 char xlv_type; /* k=keys .=pos x=substr v=vec /=join/re
509 * y=alem/helem/iter t=tie T=tied HE */
510 char xlv_flags; /* 1 = negative offset 2 = negative len */
513 /* This structure works in 3 ways - regular scalar, GV with GP, or fast
521 typedef U16 cv_flags_t;
523 #define _XPVCV_COMMON \
531 void (*xcv_xsub) (pTHX_ CV*); \
537 U32 xcv_outside_seq; /* the COP sequence (at the point of our \
538 * compilation) in the lexically enclosing \
542 /* This structure must match XPVCV in cv.h */
553 /* ifp and ofp are normally the same, but sockets need separate streams */
555 /* Cray addresses everything by word boundaries (64 bits) and
556 * code and data pointers cannot be mixed (which is exactly what
557 * Perl_filter_add() tries to do with the dirp), hence the
558 * following union trick (as suggested by Gurusamy Sarathy).
559 * For further information see Geir Johansen's problem report
560 * titled [ID 20000612.002] Perl problem on Cray system
561 * The any pointer (known as IoANY()) will also be a good place
562 * to hang any IO disciplines to.
565 DIR * xiou_dirp; /* for opendir, readdir, etc */
566 void * xiou_any; /* for alignment */
568 /* IV xio_lines is now in IVX $. */
569 IV xio_page; /* $% */
570 IV xio_page_len; /* $= */
571 IV xio_lines_left; /* $- */
572 char * xio_top_name; /* $^ */
573 GV * xio_top_gv; /* $^ */
574 char * xio_fmt_name; /* $~ */
575 GV * xio_fmt_gv; /* $~ */
576 char * xio_bottom_name;/* $^B */
577 GV * xio_bottom_gv; /* $^B */
582 #define xio_dirp xio_dirpu.xiou_dirp
583 #define xio_any xio_dirpu.xiou_any
585 #define IOf_ARGV 1 /* this fp iterates over ARGV */
586 #define IOf_START 2 /* check for null ARGV and substitute '-' */
587 #define IOf_FLUSH 4 /* this fp wants a flush after write op */
588 #define IOf_DIDTOP 8 /* just did top of form */
589 #define IOf_UNTAINT 16 /* consider this fp (and its data) "safe" */
590 #define IOf_NOLINE 32 /* slurped a pseudo-line from empty file */
591 #define IOf_FAKE_DIRP 64 /* xio_dirp is fake (source filters kludge)
592 Also, when this is set, SvPVX() is valid */
594 /* The following macros define implementation-independent predicates on SVs. */
597 =for apidoc Am|U32|SvNIOK|SV* sv
598 Returns a U32 value indicating whether the SV contains a number, integer or
601 =for apidoc Am|U32|SvNIOKp|SV* sv
602 Returns a U32 value indicating whether the SV contains a number, integer or
603 double. Checks the B<private> setting. Use C<SvNIOK> instead.
605 =for apidoc Am|void|SvNIOK_off|SV* sv
606 Unsets the NV/IV status of an SV.
608 =for apidoc Am|U32|SvOK|SV* sv
609 Returns a U32 value indicating whether the value is defined. This is
610 only meaningful for scalars.
612 =for apidoc Am|U32|SvIOKp|SV* sv
613 Returns a U32 value indicating whether the SV contains an integer. Checks
614 the B<private> setting. Use C<SvIOK> instead.
616 =for apidoc Am|U32|SvNOKp|SV* sv
617 Returns a U32 value indicating whether the SV contains a double. Checks the
618 B<private> setting. Use C<SvNOK> instead.
620 =for apidoc Am|U32|SvPOKp|SV* sv
621 Returns a U32 value indicating whether the SV contains a character string.
622 Checks the B<private> setting. Use C<SvPOK> instead.
624 =for apidoc Am|U32|SvIOK|SV* sv
625 Returns a U32 value indicating whether the SV contains an integer.
627 =for apidoc Am|void|SvIOK_on|SV* sv
628 Tells an SV that it is an integer.
630 =for apidoc Am|void|SvIOK_off|SV* sv
631 Unsets the IV status of an SV.
633 =for apidoc Am|void|SvIOK_only|SV* sv
634 Tells an SV that it is an integer and disables all other OK bits.
636 =for apidoc Am|void|SvIOK_only_UV|SV* sv
637 Tells and SV that it is an unsigned integer and disables all other OK bits.
639 =for apidoc Am|bool|SvIOK_UV|SV* sv
640 Returns a boolean indicating whether the SV contains an unsigned integer.
642 =for apidoc Am|bool|SvUOK|SV* sv
643 Returns a boolean indicating whether the SV contains an unsigned integer.
645 =for apidoc Am|bool|SvIOK_notUV|SV* sv
646 Returns a boolean indicating whether the SV contains a signed integer.
648 =for apidoc Am|U32|SvNOK|SV* sv
649 Returns a U32 value indicating whether the SV contains a double.
651 =for apidoc Am|void|SvNOK_on|SV* sv
652 Tells an SV that it is a double.
654 =for apidoc Am|void|SvNOK_off|SV* sv
655 Unsets the NV status of an SV.
657 =for apidoc Am|void|SvNOK_only|SV* sv
658 Tells an SV that it is a double and disables all other OK bits.
660 =for apidoc Am|U32|SvPOK|SV* sv
661 Returns a U32 value indicating whether the SV contains a character
664 =for apidoc Am|void|SvPOK_on|SV* sv
665 Tells an SV that it is a string.
667 =for apidoc Am|void|SvPOK_off|SV* sv
668 Unsets the PV status of an SV.
670 =for apidoc Am|void|SvPOK_only|SV* sv
671 Tells an SV that it is a string and disables all other OK bits.
672 Will also turn off the UTF-8 status.
674 =for apidoc Am|bool|SvVOK|SV* sv
675 Returns a boolean indicating whether the SV contains a v-string.
677 =for apidoc Am|U32|SvOOK|SV* sv
678 Returns a U32 indicating whether the pointer to the string buffer is offset.
679 This hack is used internally to speed up removal of characters from the
680 beginning of a SvPV. When SvOOK is true, then the start of the
681 allocated string buffer is actually C<SvOOK_offset()> bytes before SvPVX.
682 This offset used to be stored in SvIVX, but is now stored within the spare
685 =for apidoc Am|U32|SvROK|SV* sv
686 Tests if the SV is an RV.
688 =for apidoc Am|void|SvROK_on|SV* sv
689 Tells an SV that it is an RV.
691 =for apidoc Am|void|SvROK_off|SV* sv
692 Unsets the RV status of an SV.
694 =for apidoc Am|SV*|SvRV|SV* sv
695 Dereferences an RV to return the SV.
697 =for apidoc Am|IV|SvIVX|SV* sv
698 Returns the raw value in the SV's IV slot, without checks or conversions.
699 Only use when you are sure SvIOK is true. See also C<SvIV()>.
701 =for apidoc Am|UV|SvUVX|SV* sv
702 Returns the raw value in the SV's UV slot, without checks or conversions.
703 Only use when you are sure SvIOK is true. See also C<SvUV()>.
705 =for apidoc Am|NV|SvNVX|SV* sv
706 Returns the raw value in the SV's NV slot, without checks or conversions.
707 Only use when you are sure SvNOK is true. See also C<SvNV()>.
709 =for apidoc Am|char*|SvPVX|SV* sv
710 Returns a pointer to the physical string in the SV. The SV must contain a
713 This is also used to store the name of an autoloaded subroutine in an XS
714 AUTOLOAD routine. See L<perlguts/Autoloading with XSUBs>.
716 =for apidoc Am|STRLEN|SvCUR|SV* sv
717 Returns the length of the string which is in the SV. See C<SvLEN>.
719 =for apidoc Am|STRLEN|SvLEN|SV* sv
720 Returns the size of the string buffer in the SV, not including any part
721 attributable to C<SvOOK>. See C<SvCUR>.
723 =for apidoc Am|char*|SvEND|SV* sv
724 Returns a pointer to the spot just after the last character in
725 the string which is in the SV, where there is usually a trailing
726 null (even though Perl scalars do not strictly require it).
727 See C<SvCUR>. Access the character as *(SvEND(sv)).
729 Warning: If C<SvCUR> is equal to C<SvLEN>, then C<SvEND> points to
732 =for apidoc Am|HV*|SvSTASH|SV* sv
733 Returns the stash of the SV.
735 =for apidoc Am|void|SvIV_set|SV* sv|IV val
736 Set the value of the IV pointer in sv to val. It is possible to perform
737 the same function of this macro with an lvalue assignment to C<SvIVX>.
738 With future Perls, however, it will be more efficient to use
739 C<SvIV_set> instead of the lvalue assignment to C<SvIVX>.
741 =for apidoc Am|void|SvNV_set|SV* sv|NV val
742 Set the value of the NV pointer in sv to val. See C<SvIV_set>.
744 =for apidoc Am|void|SvPV_set|SV* sv|char* val
745 Set the value of the PV pointer in sv to val. See C<SvIV_set>.
747 =for apidoc Am|void|SvUV_set|SV* sv|UV val
748 Set the value of the UV pointer in sv to val. See C<SvIV_set>.
750 =for apidoc Am|void|SvRV_set|SV* sv|SV* val
751 Set the value of the RV pointer in sv to val. See C<SvIV_set>.
753 =for apidoc Am|void|SvMAGIC_set|SV* sv|MAGIC* val
754 Set the value of the MAGIC pointer in sv to val. See C<SvIV_set>.
756 =for apidoc Am|void|SvSTASH_set|SV* sv|HV* val
757 Set the value of the STASH pointer in sv to val. See C<SvIV_set>.
759 =for apidoc Am|void|SvCUR_set|SV* sv|STRLEN len
760 Set the current length of the string which is in the SV. See C<SvCUR>
763 =for apidoc Am|void|SvLEN_set|SV* sv|STRLEN len
764 Set the actual length of the string which is in the SV. See C<SvIV_set>.
769 #define SvNIOK(sv) (SvFLAGS(sv) & (SVf_IOK|SVf_NOK))
770 #define SvNIOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK))
771 #define SvNIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK| \
772 SVp_IOK|SVp_NOK|SVf_IVisUV))
774 #define assert_not_ROK(sv) assert_(!SvROK(sv) || !SvRV(sv))
775 #define assert_not_glob(sv) assert_(!isGV_with_GP(sv))
777 #define SvOK(sv) ((SvTYPE(sv) == SVt_BIND) \
778 ? (SvFLAGS(SvRV(sv)) & SVf_OK) \
779 : (SvFLAGS(sv) & SVf_OK))
780 #define SvOK_off(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
781 SvFLAGS(sv) &= ~(SVf_OK| \
782 SVf_IVisUV|SVf_UTF8), \
784 #define SvOK_off_exc_UV(sv) (assert_not_ROK(sv) \
785 SvFLAGS(sv) &= ~(SVf_OK| \
789 #define SvOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK))
790 #define SvIOKp(sv) (SvFLAGS(sv) & SVp_IOK)
791 #define SvIOKp_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
792 SvFLAGS(sv) |= SVp_IOK)
793 #define SvNOKp(sv) (SvFLAGS(sv) & SVp_NOK)
794 #define SvNOKp_on(sv) (assert_not_glob(sv) SvFLAGS(sv) |= SVp_NOK)
795 #define SvPOKp(sv) (SvFLAGS(sv) & SVp_POK)
796 #define SvPOKp_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
797 SvFLAGS(sv) |= SVp_POK)
799 #define SvIOK(sv) (SvFLAGS(sv) & SVf_IOK)
800 #define SvIOK_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
801 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
802 #define SvIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVp_IOK|SVf_IVisUV))
803 #define SvIOK_only(sv) (SvOK_off(sv), \
804 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
805 #define SvIOK_only_UV(sv) (assert_not_glob(sv) SvOK_off_exc_UV(sv), \
806 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
808 #define SvIOK_UV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
809 == (SVf_IOK|SVf_IVisUV))
810 #define SvUOK(sv) SvIOK_UV(sv)
811 #define SvIOK_notUV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
814 #define SvIsUV(sv) (SvFLAGS(sv) & SVf_IVisUV)
815 #define SvIsUV_on(sv) (SvFLAGS(sv) |= SVf_IVisUV)
816 #define SvIsUV_off(sv) (SvFLAGS(sv) &= ~SVf_IVisUV)
818 #define SvNOK(sv) (SvFLAGS(sv) & SVf_NOK)
819 #define SvNOK_on(sv) (assert_not_glob(sv) \
820 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
821 #define SvNOK_off(sv) (SvFLAGS(sv) &= ~(SVf_NOK|SVp_NOK))
822 #define SvNOK_only(sv) (SvOK_off(sv), \
823 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
826 =for apidoc Am|U32|SvUTF8|SV* sv
827 Returns a U32 value indicating the UTF-8 status of an SV. If things are set-up
828 properly, this indicates whether or not the SV contains UTF-8 encoded data.
829 Call this after SvPV() in case any call to string overloading updates the
832 =for apidoc Am|void|SvUTF8_on|SV *sv
833 Turn on the UTF-8 status of an SV (the data is not changed, just the flag).
834 Do not use frivolously.
836 =for apidoc Am|void|SvUTF8_off|SV *sv
837 Unsets the UTF-8 status of an SV (the data is not changed, just the flag).
838 Do not use frivolously.
840 =for apidoc Am|void|SvPOK_only_UTF8|SV* sv
841 Tells an SV that it is a string and disables all other OK bits,
842 and leaves the UTF-8 status as it was.
847 /* Ensure the return value of this macro does not clash with the GV_ADD* flags
849 #define SvUTF8(sv) (SvFLAGS(sv) & SVf_UTF8)
850 #define SvUTF8_on(sv) (SvFLAGS(sv) |= (SVf_UTF8))
851 #define SvUTF8_off(sv) (SvFLAGS(sv) &= ~(SVf_UTF8))
853 #define SvPOK(sv) (SvFLAGS(sv) & SVf_POK)
854 #define SvPOK_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
855 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
856 #define SvPOK_off(sv) (SvFLAGS(sv) &= ~(SVf_POK|SVp_POK))
857 #define SvPOK_only(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
858 SvFLAGS(sv) &= ~(SVf_OK| \
859 SVf_IVisUV|SVf_UTF8), \
860 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
861 #define SvPOK_only_UTF8(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
862 SvFLAGS(sv) &= ~(SVf_OK| \
864 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
866 #define SvVOK(sv) (SvMAGICAL(sv) \
867 && mg_find(sv,PERL_MAGIC_vstring))
868 /* returns the vstring magic, if any */
869 #define SvVSTRING_mg(sv) (SvMAGICAL(sv) \
870 ? mg_find(sv,PERL_MAGIC_vstring) : NULL)
872 #define SvOOK(sv) (SvFLAGS(sv) & SVf_OOK)
873 #define SvOOK_on(sv) (SvFLAGS(sv) |= SVf_OOK)
874 #define SvOOK_off(sv) ((void)(SvOOK(sv) && sv_backoff(sv)))
876 #define SvFAKE(sv) (SvFLAGS(sv) & SVf_FAKE)
877 #define SvFAKE_on(sv) (SvFLAGS(sv) |= SVf_FAKE)
878 #define SvFAKE_off(sv) (SvFLAGS(sv) &= ~SVf_FAKE)
880 #define SvROK(sv) (SvFLAGS(sv) & SVf_ROK)
881 #define SvROK_on(sv) (SvFLAGS(sv) |= SVf_ROK)
882 #define SvROK_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK))
884 #define SvMAGICAL(sv) (SvFLAGS(sv) & (SVs_GMG|SVs_SMG|SVs_RMG))
885 #define SvMAGICAL_on(sv) (SvFLAGS(sv) |= (SVs_GMG|SVs_SMG|SVs_RMG))
886 #define SvMAGICAL_off(sv) (SvFLAGS(sv) &= ~(SVs_GMG|SVs_SMG|SVs_RMG))
888 #define SvGMAGICAL(sv) (SvFLAGS(sv) & SVs_GMG)
889 #define SvGMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_GMG)
890 #define SvGMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_GMG)
892 #define SvSMAGICAL(sv) (SvFLAGS(sv) & SVs_SMG)
893 #define SvSMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_SMG)
894 #define SvSMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_SMG)
896 #define SvRMAGICAL(sv) (SvFLAGS(sv) & SVs_RMG)
897 #define SvRMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_RMG)
898 #define SvRMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_RMG)
900 #define SvAMAGIC(sv) (SvROK(sv) && SvOBJECT(SvRV(sv)) && \
901 HvAMAGIC(SvSTASH(SvRV(sv))))
902 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
903 # define SvAMAGIC_on(sv) ({ SV * const kloink = sv; \
904 assert(SvROK(kloink)); \
905 if (SvOBJECT(SvRV(kloink))) \
906 HvAMAGIC_on(SvSTASH(SvRV(kloink))); \
908 # define SvAMAGIC_off(sv) ({ SV * const kloink = sv; \
910 && SvOBJECT(SvRV(kloink))) \
911 HvAMAGIC_off(SvSTASH(SvRV(kloink))); \
914 # define SvAMAGIC_on(sv) \
915 SvOBJECT(SvRV(sv)) && (SvFLAGS(SvSTASH(SvRV(sv))) |= SVf_AMAGIC)
916 # define SvAMAGIC_off(sv) \
917 (SvROK(sv) && SvOBJECT(SvRV(sv)) \
918 && (SvFLAGS(SvSTASH(SvRV(sv))) &= ~SVf_AMAGIC))
921 /* To be used on the stashes themselves: */
922 #define HvAMAGIC(hv) (SvFLAGS(hv) & SVf_AMAGIC)
923 #define HvAMAGIC_on(hv) (SvFLAGS(hv) |= SVf_AMAGIC)
924 #define HvAMAGIC_off(hv) (SvFLAGS(hv) &=~ SVf_AMAGIC)
927 #define SvPOK_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVs_GMG)) == SVf_POK)
928 #define SvIOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVs_GMG)) == SVf_IOK)
929 #define SvUOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
930 #define SvNOK_nog(sv) ((SvFLAGS(sv) & (SVf_NOK|SVs_GMG)) == SVf_NOK)
931 #define SvNIOK_nog(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & SVs_GMG))
933 #define SvPOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
934 #define SvIOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_THINKFIRST|SVs_GMG)) == SVf_IOK)
935 #define SvUOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVf_THINKFIRST|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
936 #define SvNOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_NOK|SVf_THINKFIRST|SVs_GMG)) == SVf_NOK)
937 #define SvNIOK_nogthink(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & (SVf_THINKFIRST|SVs_GMG)))
939 #define SvPOK_utf8_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == (SVf_POK|SVf_UTF8))
940 #define SvPOK_utf8_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
942 #define SvPOK_byte_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == SVf_POK)
943 #define SvPOK_byte_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
945 #define SvPOK_pure_nogthink(sv) \
946 ((SvFLAGS(sv) & (SVf_POK|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
947 #define SvPOK_utf8_pure_nogthink(sv) \
948 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
949 #define SvPOK_byte_pure_nogthink(sv) \
950 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
953 =for apidoc Am|U32|SvGAMAGIC|SV* sv
955 Returns true if the SV has get magic or
956 overloading. If either is true then
957 the scalar is active data, and has the potential to return a new value every
958 time it is accessed. Hence you must be careful to
959 only read it once per user logical operation and work
960 with that returned value. If neither is true then
961 the scalar's value cannot change unless written to.
966 #define SvGAMAGIC(sv) (SvGMAGICAL(sv) || SvAMAGIC(sv))
968 #define Gv_AMG(stash) \
969 (HvNAME(stash) && Gv_AMupdate(stash,FALSE) \
971 : (HvAMAGIC_off(stash), 0))
973 #define SvWEAKREF(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_WEAKREF)) \
974 == (SVf_ROK|SVprv_WEAKREF))
975 #define SvWEAKREF_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_WEAKREF))
976 #define SvWEAKREF_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_WEAKREF))
978 #define SvPCS_IMPORTED(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_PCS_IMPORTED)) \
979 == (SVf_ROK|SVprv_PCS_IMPORTED))
980 #define SvPCS_IMPORTED_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_PCS_IMPORTED))
981 #define SvPCS_IMPORTED_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_PCS_IMPORTED))
984 =for apidoc m|U32|SvTHINKFIRST|SV *sv
986 A quick flag check to see whether an sv should be passed to sv_force_normal
987 to be "downgraded" before SvIVX or SvPVX can be modified directly.
989 For example, if your scalar is a reference and you want to modify the SvIVX
990 slot, you can't just do SvROK_off, as that will leak the referent.
992 This is used internally by various sv-modifying functions, such as
993 sv_setsv, sv_setiv and sv_pvn_force.
995 One case that this does not handle is a gv without SvFAKE set. After
997 if (SvTHINKFIRST(gv)) sv_force_normal(gv);
999 it will still be a gv.
1001 SvTHINKFIRST sometimes produces false positives. In those cases
1002 sv_force_normal does nothing.
1007 #define SvTHINKFIRST(sv) (SvFLAGS(sv) & SVf_THINKFIRST)
1009 #define SvPADMY(sv) (SvFLAGS(sv) & SVs_PADMY)
1010 #define SvPADMY_on(sv) (SvFLAGS(sv) |= SVs_PADMY)
1012 /* SVs_PADTMP and SVs_PADSTALE share the same bit, mediated by SVs_PADMY */
1014 #define SvPADTMP(sv) ((SvFLAGS(sv) & (SVs_PADMY|SVs_PADTMP)) == SVs_PADTMP)
1015 #define SvPADSTALE(sv) ((SvFLAGS(sv) & (SVs_PADMY|SVs_PADSTALE)) \
1016 == (SVs_PADMY|SVs_PADSTALE))
1018 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1019 # define SvPADTMP_on(sv) ({ \
1020 SV *const _svpad = MUTABLE_SV(sv); \
1021 assert(!(SvFLAGS(_svpad) & SVs_PADMY)); \
1022 SvFLAGS(_svpad) |= SVs_PADTMP; \
1024 # define SvPADTMP_off(sv) ({ \
1025 SV *const _svpad = MUTABLE_SV(sv); \
1026 assert(!(SvFLAGS(_svpad) & SVs_PADMY)); \
1027 SvFLAGS(_svpad) &= ~SVs_PADTMP; \
1029 # define SvPADSTALE_on(sv) ({ \
1030 SV *const _svpad = MUTABLE_SV(sv); \
1031 assert(SvFLAGS(_svpad) & SVs_PADMY); \
1032 SvFLAGS(_svpad) |= SVs_PADSTALE; \
1034 # define SvPADSTALE_off(sv) ({ \
1035 SV *const _svpad = MUTABLE_SV(sv); \
1036 assert(SvFLAGS(_svpad) & SVs_PADMY); \
1037 SvFLAGS(_svpad) &= ~SVs_PADSTALE; \
1040 # define SvPADTMP_on(sv) (SvFLAGS(sv) |= SVs_PADTMP)
1041 # define SvPADTMP_off(sv) (SvFLAGS(sv) &= ~SVs_PADTMP)
1042 # define SvPADSTALE_on(sv) (SvFLAGS(sv) |= SVs_PADSTALE)
1043 # define SvPADSTALE_off(sv) (SvFLAGS(sv) &= ~SVs_PADSTALE)
1046 #define SvTEMP(sv) (SvFLAGS(sv) & SVs_TEMP)
1047 #define SvTEMP_on(sv) (SvFLAGS(sv) |= SVs_TEMP)
1048 #define SvTEMP_off(sv) (SvFLAGS(sv) &= ~SVs_TEMP)
1050 #define SvOBJECT(sv) (SvFLAGS(sv) & SVs_OBJECT)
1051 #define SvOBJECT_on(sv) (SvFLAGS(sv) |= SVs_OBJECT)
1052 #define SvOBJECT_off(sv) (SvFLAGS(sv) &= ~SVs_OBJECT)
1054 #define SvREADONLY(sv) (SvFLAGS(sv) & SVf_READONLY)
1055 #define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1056 #define SvREADONLY_off(sv) (SvFLAGS(sv) &= ~SVf_READONLY)
1058 #define SvSCREAM(sv) ((SvFLAGS(sv) & (SVp_SCREAM|SVp_POK)) == (SVp_SCREAM|SVp_POK))
1059 #define SvSCREAM_on(sv) (SvFLAGS(sv) |= SVp_SCREAM)
1060 #define SvSCREAM_off(sv) (SvFLAGS(sv) &= ~SVp_SCREAM)
1063 # define SvCOMPILED(sv) 0
1064 # define SvCOMPILED_on(sv)
1065 # define SvCOMPILED_off(sv)
1068 #define SvEVALED(sv) (SvFLAGS(sv) & SVrepl_EVAL)
1069 #define SvEVALED_on(sv) (SvFLAGS(sv) |= SVrepl_EVAL)
1070 #define SvEVALED_off(sv) (SvFLAGS(sv) &= ~SVrepl_EVAL)
1072 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1073 # define SvVALID(sv) ({ const SV *const _svvalid = (const SV*)(sv); \
1074 if (SvFLAGS(_svvalid) & SVpbm_VALID) \
1075 assert(!isGV_with_GP(_svvalid)); \
1076 (SvFLAGS(_svvalid) & SVpbm_VALID); \
1078 # define SvVALID_on(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
1079 assert(!isGV_with_GP(_svvalid)); \
1080 (SvFLAGS(_svvalid) |= SVpbm_VALID); \
1082 # define SvVALID_off(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
1083 assert(!isGV_with_GP(_svvalid)); \
1084 (SvFLAGS(_svvalid) &= ~SVpbm_VALID); \
1087 # define SvTAIL(sv) ({ const SV *const _svtail = (const SV *)(sv); \
1088 assert(SvTYPE(_svtail) != SVt_PVAV); \
1089 assert(SvTYPE(_svtail) != SVt_PVHV); \
1090 (SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1091 == (SVpbm_TAIL|SVpbm_VALID); \
1094 # define SvVALID(sv) (SvFLAGS(sv) & SVpbm_VALID)
1095 # define SvVALID_on(sv) (SvFLAGS(sv) |= SVpbm_VALID)
1096 # define SvVALID_off(sv) (SvFLAGS(sv) &= ~SVpbm_VALID)
1097 # define SvTAIL(sv) ((SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
1098 == (SVpbm_TAIL|SVpbm_VALID))
1101 #define SvTAIL_on(sv) (SvFLAGS(sv) |= SVpbm_TAIL)
1102 #define SvTAIL_off(sv) (SvFLAGS(sv) &= ~SVpbm_TAIL)
1105 #define SvPAD_TYPED(sv) \
1106 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_TYPED)) == (SVpad_NAME|SVpad_TYPED))
1108 #define SvPAD_OUR(sv) \
1109 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_OUR)) == (SVpad_NAME|SVpad_OUR))
1111 #define SvPAD_STATE(sv) \
1112 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_STATE)) == (SVpad_NAME|SVpad_STATE))
1114 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1115 # define SvPAD_TYPED_on(sv) ({ \
1116 SV *const _svpad = MUTABLE_SV(sv); \
1117 assert(SvTYPE(_svpad) == SVt_PVMG); \
1118 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_TYPED); \
1120 #define SvPAD_OUR_on(sv) ({ \
1121 SV *const _svpad = MUTABLE_SV(sv); \
1122 assert(SvTYPE(_svpad) == SVt_PVMG); \
1123 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_OUR); \
1125 #define SvPAD_STATE_on(sv) ({ \
1126 SV *const _svpad = MUTABLE_SV(sv); \
1127 assert(SvTYPE(_svpad) == SVt_PVNV || SvTYPE(_svpad) == SVt_PVMG); \
1128 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_STATE); \
1131 # define SvPAD_TYPED_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_TYPED)
1132 # define SvPAD_OUR_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_OUR)
1133 # define SvPAD_STATE_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_STATE)
1136 #define SvOURSTASH(sv) \
1137 (SvPAD_OUR(sv) ? ((XPVMG*) SvANY(sv))->xmg_u.xmg_ourstash : NULL)
1138 #define SvOURSTASH_set(sv, st) \
1140 assert(SvTYPE(sv) == SVt_PVMG); \
1141 ((XPVMG*) SvANY(sv))->xmg_u.xmg_ourstash = st; \
1144 #define SvRVx(sv) SvRV(sv)
1146 #ifdef PERL_DEBUG_COW
1147 /* Need -0.0 for SvNVX to preserve IEEE FP "negative zero" because
1148 +0.0 + -0.0 => +0.0 but -0.0 + -0.0 => -0.0 */
1149 # define SvIVX(sv) (0 + ((XPVIV*) SvANY(sv))->xiv_iv)
1150 # define SvUVX(sv) (0 + ((XPVUV*) SvANY(sv))->xuv_uv)
1151 # define SvNVX(sv) (-0.0 + ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv)
1152 # define SvRV(sv) (0 + (sv)->sv_u.svu_rv)
1153 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1154 /* Don't test the core XS code yet. */
1155 # if defined (PERL_CORE) && PERL_DEBUG_COW > 1
1156 # define SvPVX(sv) (0 + (assert_(!SvREADONLY(sv)) (sv)->sv_u.svu_pv))
1158 # define SvPVX(sv) SvPVX_mutable(sv)
1160 # define SvCUR(sv) (0 + ((XPV*) SvANY(sv))->xpv_cur)
1161 # define SvLEN(sv) (0 + ((XPV*) SvANY(sv))->xpv_len)
1162 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1164 # define SvMAGIC(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_u.xmg_magic))
1165 # define SvSTASH(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_stash))
1167 # define SvLEN(sv) ((XPV*) SvANY(sv))->xpv_len
1168 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1170 # if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1171 /* These get expanded inside other macros that already use a variable _sv */
1172 # define SvPVX(sv) \
1173 (*({ SV *const _svpvx = MUTABLE_SV(sv); \
1174 assert(PL_valid_types_PVX[SvTYPE(_svpvx) & SVt_MASK]); \
1175 assert(!isGV_with_GP(_svpvx)); \
1176 assert(!(SvTYPE(_svpvx) == SVt_PVIO \
1177 && !(IoFLAGS(_svpvx) & IOf_FAKE_DIRP))); \
1178 &((_svpvx)->sv_u.svu_pv); \
1180 # define SvCUR(sv) \
1181 (*({ const SV *const _svcur = (const SV *)(sv); \
1182 assert(PL_valid_types_PVX[SvTYPE(_svcur) & SVt_MASK]); \
1183 assert(!isGV_with_GP(_svcur)); \
1184 assert(!(SvTYPE(_svcur) == SVt_PVIO \
1185 && !(IoFLAGS(_svcur) & IOf_FAKE_DIRP))); \
1186 &(((XPV*) MUTABLE_PTR(SvANY(_svcur)))->xpv_cur); \
1188 # define SvIVX(sv) \
1189 (*({ const SV *const _svivx = (const SV *)(sv); \
1190 assert(PL_valid_types_IVX[SvTYPE(_svivx) & SVt_MASK]); \
1191 assert(!isGV_with_GP(_svivx)); \
1192 &(((XPVIV*) MUTABLE_PTR(SvANY(_svivx)))->xiv_iv); \
1194 # define SvUVX(sv) \
1195 (*({ const SV *const _svuvx = (const SV *)(sv); \
1196 assert(PL_valid_types_IVX[SvTYPE(_svuvx) & SVt_MASK]); \
1197 assert(!isGV_with_GP(_svuvx)); \
1198 &(((XPVUV*) MUTABLE_PTR(SvANY(_svuvx)))->xuv_uv); \
1200 # define SvNVX(sv) \
1201 (*({ const SV *const _svnvx = (const SV *)(sv); \
1202 assert(PL_valid_types_NVX[SvTYPE(_svnvx) & SVt_MASK]); \
1203 assert(!isGV_with_GP(_svnvx)); \
1204 &(((XPVNV*) MUTABLE_PTR(SvANY(_svnvx)))->xnv_u.xnv_nv); \
1207 (*({ SV *const _svrv = MUTABLE_SV(sv); \
1208 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1209 assert(!isGV_with_GP(_svrv)); \
1210 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1211 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1212 &((_svrv)->sv_u.svu_rv); \
1214 # define SvRV_const(sv) \
1215 ({ const SV *const _svrv = (const SV *)(sv); \
1216 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1217 assert(!isGV_with_GP(_svrv)); \
1218 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1219 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1220 (_svrv)->sv_u.svu_rv; \
1222 # define SvMAGIC(sv) \
1223 (*({ const SV *const _svmagic = (const SV *)(sv); \
1224 assert(SvTYPE(_svmagic) >= SVt_PVMG); \
1225 if(SvTYPE(_svmagic) == SVt_PVMG) \
1226 assert(!SvPAD_OUR(_svmagic)); \
1227 &(((XPVMG*) MUTABLE_PTR(SvANY(_svmagic)))->xmg_u.xmg_magic); \
1229 # define SvSTASH(sv) \
1230 (*({ const SV *const _svstash = (const SV *)(sv); \
1231 assert(SvTYPE(_svstash) >= SVt_PVMG); \
1232 &(((XPVMG*) MUTABLE_PTR(SvANY(_svstash)))->xmg_stash); \
1235 # define SvPVX(sv) ((sv)->sv_u.svu_pv)
1236 # define SvCUR(sv) ((XPV*) SvANY(sv))->xpv_cur
1237 # define SvIVX(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1238 # define SvUVX(sv) ((XPVUV*) SvANY(sv))->xuv_uv
1239 # define SvNVX(sv) ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv
1240 # define SvRV(sv) ((sv)->sv_u.svu_rv)
1241 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1242 # define SvMAGIC(sv) ((XPVMG*) SvANY(sv))->xmg_u.xmg_magic
1243 # define SvSTASH(sv) ((XPVMG*) SvANY(sv))->xmg_stash
1248 /* Given that these two are new, there can't be any existing code using them
1250 # define SvPVX_mutable(sv) (0 + (sv)->sv_u.svu_pv)
1251 # define SvPVX_const(sv) ((const char*)(0 + (sv)->sv_u.svu_pv))
1253 /* Except for the poison code, which uses & to scribble over the pointer after
1254 free() is called. */
1255 # define SvPVX_mutable(sv) ((sv)->sv_u.svu_pv)
1256 # define SvPVX_const(sv) ((const char*)((sv)->sv_u.svu_pv))
1259 #define SvIVXx(sv) SvIVX(sv)
1260 #define SvUVXx(sv) SvUVX(sv)
1261 #define SvNVXx(sv) SvNVX(sv)
1262 #define SvPVXx(sv) SvPVX(sv)
1263 #define SvLENx(sv) SvLEN(sv)
1264 #define SvENDx(sv) ((PL_Sv = (sv)), SvEND(PL_Sv))
1267 /* Ask a scalar nicely to try to become an IV, if possible.
1268 Not guaranteed to stay returning void */
1269 /* Macro won't actually call sv_2iv if already IOK */
1270 #define SvIV_please(sv) \
1271 STMT_START {if (!SvIOKp(sv) && (SvNOK(sv) || SvPOK(sv))) \
1272 (void) SvIV(sv); } STMT_END
1273 #define SvIV_please_nomg(sv) \
1274 (!SvIOKp(sv) && (SvNOK(sv) || SvPOK(sv)) \
1275 ? (SvIV_nomg(sv), SvIOK(sv)) \
1277 #define SvIV_set(sv, val) \
1279 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1280 assert(!isGV_with_GP(sv)); \
1281 (((XPVIV*) SvANY(sv))->xiv_iv = (val)); } STMT_END
1282 #define SvNV_set(sv, val) \
1284 assert(PL_valid_types_NV_set[SvTYPE(sv) & SVt_MASK]); \
1285 assert(!isGV_with_GP(sv)); \
1286 (((XPVNV*)SvANY(sv))->xnv_u.xnv_nv = (val)); } STMT_END
1287 #define SvPV_set(sv, val) \
1289 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1290 assert(!isGV_with_GP(sv)); \
1291 assert(!(SvTYPE(sv) == SVt_PVIO \
1292 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1293 ((sv)->sv_u.svu_pv = (val)); } STMT_END
1294 #define SvUV_set(sv, val) \
1296 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1297 assert(!isGV_with_GP(sv)); \
1298 (((XPVUV*)SvANY(sv))->xuv_uv = (val)); } STMT_END
1299 #define SvRV_set(sv, val) \
1301 assert(PL_valid_types_RV[SvTYPE(sv) & SVt_MASK]); \
1302 assert(!isGV_with_GP(sv)); \
1303 assert(!(SvTYPE(sv) == SVt_PVIO \
1304 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1305 ((sv)->sv_u.svu_rv = (val)); } STMT_END
1306 #define SvMAGIC_set(sv, val) \
1307 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1308 (((XPVMG*)SvANY(sv))->xmg_u.xmg_magic = (val)); } STMT_END
1309 #define SvSTASH_set(sv, val) \
1310 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1311 (((XPVMG*) SvANY(sv))->xmg_stash = (val)); } STMT_END
1312 #define SvCUR_set(sv, val) \
1314 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1315 assert(!isGV_with_GP(sv)); \
1316 assert(!(SvTYPE(sv) == SVt_PVIO \
1317 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1318 (((XPV*) SvANY(sv))->xpv_cur = (val)); } STMT_END
1319 #define SvLEN_set(sv, val) \
1321 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1322 assert(!isGV_with_GP(sv)); \
1323 assert(!(SvTYPE(sv) == SVt_PVIO \
1324 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1325 (((XPV*) SvANY(sv))->xpv_len = (val)); } STMT_END
1326 #define SvEND_set(sv, val) \
1327 STMT_START { assert(SvTYPE(sv) >= SVt_PV); \
1328 SvCUR_set(sv, (val) - SvPVX(sv)); } STMT_END
1330 #define SvPV_renew(sv,n) \
1331 STMT_START { SvLEN_set(sv, n); \
1332 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
1333 (char*)saferealloc((Malloc_t)SvPVX(sv), \
1334 (MEM_SIZE)((n))))); \
1337 #define SvPV_shrink_to_cur(sv) STMT_START { \
1338 const STRLEN _lEnGtH = SvCUR(sv) + 1; \
1339 SvPV_renew(sv, _lEnGtH); \
1342 #define SvPV_free(sv) \
1344 assert(SvTYPE(sv) >= SVt_PV); \
1346 assert(!SvROK(sv)); \
1349 SvOOK_offset(sv, zok); \
1350 SvPV_set(sv, SvPVX_mutable(sv) - zok); \
1351 SvFLAGS(sv) &= ~SVf_OOK; \
1353 Safefree(SvPVX(sv)); \
1358 /* Code that crops up in three places to take a scalar and ready it to hold
1360 # define prepare_SV_for_RV(sv) \
1362 if (SvTYPE(sv) < SVt_PV && SvTYPE(sv) != SVt_IV) \
1363 sv_upgrade(sv, SVt_IV); \
1364 else if (SvTYPE(sv) >= SVt_PV) { \
1373 # define BmFLAGS(sv) (SvTAIL(sv) ? FBMcf_TAIL : 0)
1376 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1377 # define BmRARE(sv) \
1378 (*({ SV *const _bmrare = MUTABLE_SV(sv); \
1379 assert(SvTYPE(_bmrare) == SVt_PVMG); \
1380 assert(SvVALID(_bmrare)); \
1381 &(((XPVMG*) SvANY(_bmrare))->xnv_u.xbm_s.xbm_rare); \
1383 # define BmUSEFUL(sv) \
1384 (*({ SV *const _bmuseful = MUTABLE_SV(sv); \
1385 assert(SvTYPE(_bmuseful) == SVt_PVMG); \
1386 assert(SvVALID(_bmuseful)); \
1387 assert(!SvIOK(_bmuseful)); \
1388 &(((XPVMG*) SvANY(_bmuseful))->xnv_u.xbm_s.xbm_useful); \
1390 # define BmPREVIOUS(sv) \
1391 (*({ SV *const _bmprevious = MUTABLE_SV(sv); \
1392 assert(SvTYPE(_bmprevious) == SVt_PVMG); \
1393 assert(SvVALID(_bmprevious)); \
1394 &(((XPVMG*) SvANY(_bmprevious))->xiv_u.xivu_uv); \
1397 # define BmRARE(sv) ((XPVMG*) SvANY(sv))->xnv_u.xbm_s.xbm_rare
1398 # define BmUSEFUL(sv) ((XPVMG*) SvANY(sv))->xnv_u.xbm_s.xbm_useful
1399 # define BmPREVIOUS(sv) ((XPVMG*) SvANY(sv))->xiv_u.xivu_uv
1403 #define FmLINES(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1405 #define LvTYPE(sv) ((XPVLV*) SvANY(sv))->xlv_type
1406 #define LvTARG(sv) ((XPVLV*) SvANY(sv))->xlv_targ
1407 #define LvTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff
1408 #define LvTARGLEN(sv) ((XPVLV*) SvANY(sv))->xlv_targlen
1409 #define LvFLAGS(sv) ((XPVLV*) SvANY(sv))->xlv_flags
1411 #define IoIFP(sv) (sv)->sv_u.svu_fp
1412 #define IoOFP(sv) ((XPVIO*) SvANY(sv))->xio_ofp
1413 #define IoDIRP(sv) ((XPVIO*) SvANY(sv))->xio_dirp
1414 #define IoANY(sv) ((XPVIO*) SvANY(sv))->xio_any
1415 #define IoLINES(sv) ((XPVIO*) SvANY(sv))->xiv_u.xivu_iv
1416 #define IoPAGE(sv) ((XPVIO*) SvANY(sv))->xio_page
1417 #define IoPAGE_LEN(sv) ((XPVIO*) SvANY(sv))->xio_page_len
1418 #define IoLINES_LEFT(sv)((XPVIO*) SvANY(sv))->xio_lines_left
1419 #define IoTOP_NAME(sv) ((XPVIO*) SvANY(sv))->xio_top_name
1420 #define IoTOP_GV(sv) ((XPVIO*) SvANY(sv))->xio_top_gv
1421 #define IoFMT_NAME(sv) ((XPVIO*) SvANY(sv))->xio_fmt_name
1422 #define IoFMT_GV(sv) ((XPVIO*) SvANY(sv))->xio_fmt_gv
1423 #define IoBOTTOM_NAME(sv)((XPVIO*) SvANY(sv))->xio_bottom_name
1424 #define IoBOTTOM_GV(sv) ((XPVIO*) SvANY(sv))->xio_bottom_gv
1425 #define IoTYPE(sv) ((XPVIO*) SvANY(sv))->xio_type
1426 #define IoFLAGS(sv) ((XPVIO*) SvANY(sv))->xio_flags
1428 /* IoTYPE(sv) is a single character telling the type of I/O connection. */
1429 #define IoTYPE_RDONLY '<'
1430 #define IoTYPE_WRONLY '>'
1431 #define IoTYPE_RDWR '+'
1432 #define IoTYPE_APPEND 'a'
1433 #define IoTYPE_PIPE '|'
1434 #define IoTYPE_STD '-' /* stdin or stdout */
1435 #define IoTYPE_SOCKET 's'
1436 #define IoTYPE_CLOSED ' '
1437 #define IoTYPE_IMPLICIT 'I' /* stdin or stdout or stderr */
1438 #define IoTYPE_NUMERIC '#' /* fdopen */
1441 =for apidoc Am|bool|SvTAINTED|SV* sv
1442 Checks to see if an SV is tainted. Returns TRUE if it is, FALSE if
1445 =for apidoc Am|void|SvTAINTED_on|SV* sv
1446 Marks an SV as tainted if tainting is enabled.
1448 =for apidoc Am|void|SvTAINTED_off|SV* sv
1449 Untaints an SV. Be I<very> careful with this routine, as it short-circuits
1450 some of Perl's fundamental security features. XS module authors should not
1451 use this function unless they fully understand all the implications of
1452 unconditionally untainting the value. Untainting should be done in the
1453 standard perl fashion, via a carefully crafted regexp, rather than directly
1454 untainting variables.
1456 =for apidoc Am|void|SvTAINT|SV* sv
1457 Taints an SV if tainting is enabled, and if some input to the current
1458 expression is tainted--usually a variable, but possibly also implicit
1459 inputs such as locale settings. C<SvTAINT> propagates that taintedness to
1460 the outputs of an expression in a pessimistic fashion; i.e., without paying
1461 attention to precisely which outputs are influenced by which inputs.
1466 #define sv_taint(sv) sv_magic((sv), NULL, PERL_MAGIC_taint, NULL, 0)
1468 #define SvTAINTED(sv) (SvMAGICAL(sv) && sv_tainted(sv))
1469 #define SvTAINTED_on(sv) STMT_START{ if(PL_tainting){sv_taint(sv);} }STMT_END
1470 #define SvTAINTED_off(sv) STMT_START{ if(PL_tainting){sv_untaint(sv);} }STMT_END
1472 #define SvTAINT(sv) \
1474 if (PL_tainting) { \
1481 =for apidoc Am|char*|SvPV_force|SV* sv|STRLEN len
1482 Like C<SvPV> but will force the SV into containing a string (C<SvPOK>), and
1483 only a string (C<SvPOK_only>), by hook or by crook. You want force if you are
1484 going to update the C<SvPVX> directly. Processes get magic.
1486 =for apidoc Am|char*|SvPV_force_nomg|SV* sv|STRLEN len
1487 Like C<SvPV> but will force the SV into containing a string (C<SvPOK>), and
1488 only a string (C<SvPOK_only>), by hook or by crook. You want force if you are
1489 going to update the C<SvPVX> directly. Doesn't process get magic.
1491 =for apidoc Am|char*|SvPV|SV* sv|STRLEN len
1492 Returns a pointer to the string in the SV, or a stringified form of
1493 the SV if the SV does not contain a string. The SV may cache the
1494 stringified version becoming C<SvPOK>. Handles 'get' magic. See also
1495 C<SvPVx> for a version which guarantees to evaluate sv only once.
1497 =for apidoc Am|char*|SvPVx|SV* sv|STRLEN len
1498 A version of C<SvPV> which guarantees to evaluate C<sv> only once.
1499 Only use this if C<sv> is an expression with side effects, otherwise use the
1500 more efficient C<SvPV>.
1502 =for apidoc Am|char*|SvPV_nomg|SV* sv|STRLEN len
1503 Like C<SvPV> but doesn't process magic.
1505 =for apidoc Am|char*|SvPV_nolen|SV* sv
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 form becoming C<SvPOK>. Handles 'get' magic.
1510 =for apidoc Am|char*|SvPV_nomg_nolen|SV* sv
1511 Like C<SvPV_nolen> but doesn't process magic.
1513 =for apidoc Am|IV|SvIV|SV* sv
1514 Coerces the given SV to an integer and returns it. See C<SvIVx> for a
1515 version which guarantees to evaluate sv only once.
1517 =for apidoc Am|IV|SvIV_nomg|SV* sv
1518 Like C<SvIV> but doesn't process magic.
1520 =for apidoc Am|IV|SvIVx|SV* sv
1521 Coerces the given SV to an integer and returns it.
1522 Guarantees to evaluate C<sv> only once. Only use
1523 this if C<sv> is an expression with side effects,
1524 otherwise use the more efficient C<SvIV>.
1526 =for apidoc Am|NV|SvNV|SV* sv
1527 Coerce the given SV to a double and return it. See C<SvNVx> for a version
1528 which guarantees to evaluate sv only once.
1530 =for apidoc Am|NV|SvNV_nomg|SV* sv
1531 Like C<SvNV> but doesn't process magic.
1533 =for apidoc Am|NV|SvNVx|SV* sv
1534 Coerces the given SV to a double and returns it.
1535 Guarantees to evaluate C<sv> only once. Only use
1536 this if C<sv> is an expression with side effects,
1537 otherwise use the more efficient C<SvNV>.
1539 =for apidoc Am|UV|SvUV|SV* sv
1540 Coerces the given SV to an unsigned integer and returns it. See C<SvUVx>
1541 for a version which guarantees to evaluate sv only once.
1543 =for apidoc Am|UV|SvUV_nomg|SV* sv
1544 Like C<SvUV> but doesn't process magic.
1546 =for apidoc Am|UV|SvUVx|SV* sv
1547 Coerces the given SV to an unsigned integer and
1548 returns it. Guarantees to C<sv> only once. Only
1549 use this if C<sv> is an expression with side effects,
1550 otherwise use the more efficient C<SvUV>.
1552 =for apidoc Am|bool|SvTRUE|SV* sv
1553 Returns a boolean indicating whether Perl would evaluate the SV as true or
1554 false. See SvOK() for a defined/undefined test. Handles 'get' magic
1555 unless the scalar is already SvPOK, SvIOK or SvNOK (the public, not the
1558 =for apidoc Am|bool|SvTRUE_nomg|SV* sv
1559 Returns a boolean indicating whether Perl would evaluate the SV as true or
1560 false. See SvOK() for a defined/undefined test. Does not handle 'get' magic.
1562 =for apidoc Am|char*|SvPVutf8_force|SV* sv|STRLEN len
1563 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1565 =for apidoc Am|char*|SvPVutf8|SV* sv|STRLEN len
1566 Like C<SvPV>, but converts sv to utf8 first if necessary.
1568 =for apidoc Am|char*|SvPVutf8_nolen|SV* sv
1569 Like C<SvPV_nolen>, but converts sv to utf8 first if necessary.
1571 =for apidoc Am|char*|SvPVbyte_force|SV* sv|STRLEN len
1572 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1574 =for apidoc Am|char*|SvPVbyte|SV* sv|STRLEN len
1575 Like C<SvPV>, but converts sv to byte representation first if necessary.
1577 =for apidoc Am|char*|SvPVbyte_nolen|SV* sv
1578 Like C<SvPV_nolen>, but converts sv to byte representation first if necessary.
1580 =for apidoc Am|char*|SvPVutf8x_force|SV* sv|STRLEN len
1581 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1582 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8_force>
1585 =for apidoc Am|char*|SvPVutf8x|SV* sv|STRLEN len
1586 Like C<SvPV>, but converts sv to utf8 first if necessary.
1587 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8>
1590 =for apidoc Am|char*|SvPVbytex_force|SV* sv|STRLEN len
1591 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1592 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte_force>
1595 =for apidoc Am|char*|SvPVbytex|SV* sv|STRLEN len
1596 Like C<SvPV>, but converts sv to byte representation first if necessary.
1597 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte>
1600 =for apidoc Am|bool|SvIsCOW|SV* sv
1601 Returns a boolean indicating whether the SV is Copy-On-Write (either shared
1602 hash key scalars, or full Copy On Write scalars if 5.9.0 is configured for
1605 =for apidoc Am|bool|SvIsCOW_shared_hash|SV* sv
1606 Returns a boolean indicating whether the SV is Copy-On-Write shared hash key
1609 =for apidoc Am|void|sv_catpvn_nomg|SV* sv|const char* ptr|STRLEN len
1610 Like C<sv_catpvn> but doesn't process magic.
1612 =for apidoc Am|void|sv_catpv_nomg|SV* sv|const char* ptr
1613 Like C<sv_catpv> but doesn't process magic.
1615 =for apidoc Am|void|sv_setsv_nomg|SV* dsv|SV* ssv
1616 Like C<sv_setsv> but doesn't process magic.
1618 =for apidoc Am|void|sv_catsv_nomg|SV* dsv|SV* ssv
1619 Like C<sv_catsv> but doesn't process magic.
1621 =for apidoc Amdb|STRLEN|sv_utf8_upgrade_nomg|NN SV *sv
1623 Like sv_utf8_upgrade, but doesn't do magic on C<sv>.
1628 /* Let us hope that bitmaps for UV and IV are the same */
1629 #define SvIV(sv) (SvIOK_nog(sv) ? SvIVX(sv) : sv_2iv(sv))
1630 #define SvUV(sv) (SvUOK_nog(sv) ? SvUVX(sv) : sv_2uv(sv))
1631 #define SvNV(sv) (SvNOK_nog(sv) ? SvNVX(sv) : sv_2nv(sv))
1633 #define SvIV_nomg(sv) (SvIOK(sv) ? SvIVX(sv) : sv_2iv_flags(sv, 0))
1634 #define SvUV_nomg(sv) (SvIOK(sv) ? SvUVX(sv) : sv_2uv_flags(sv, 0))
1635 #define SvNV_nomg(sv) (SvNOK(sv) ? SvNVX(sv) : sv_2nv_flags(sv, 0))
1639 #define SvPV(sv, lp) SvPV_flags(sv, lp, SV_GMAGIC)
1640 #define SvPV_const(sv, lp) SvPV_flags_const(sv, lp, SV_GMAGIC)
1641 #define SvPV_mutable(sv, lp) SvPV_flags_mutable(sv, lp, SV_GMAGIC)
1643 #define SvPV_flags(sv, lp, flags) \
1645 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pv_flags(sv, &lp, flags))
1646 #define SvPV_flags_const(sv, lp, flags) \
1648 ? ((lp = SvCUR(sv)), SvPVX_const(sv)) : \
1649 (const char*) sv_2pv_flags(sv, &lp, flags|SV_CONST_RETURN))
1650 #define SvPV_flags_const_nolen(sv, flags) \
1652 ? SvPVX_const(sv) : \
1653 (const char*) sv_2pv_flags(sv, 0, flags|SV_CONST_RETURN))
1654 #define SvPV_flags_mutable(sv, lp, flags) \
1656 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) : \
1657 sv_2pv_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1659 #define SvPV_force(sv, lp) SvPV_force_flags(sv, lp, SV_GMAGIC)
1660 #define SvPV_force_nolen(sv) SvPV_force_flags_nolen(sv, SV_GMAGIC)
1661 #define SvPV_force_mutable(sv, lp) SvPV_force_flags_mutable(sv, lp, SV_GMAGIC)
1663 #define SvPV_force_nomg(sv, lp) SvPV_force_flags(sv, lp, 0)
1664 #define SvPV_force_nomg_nolen(sv) SvPV_force_flags_nolen(sv, 0)
1666 #define SvPV_force_flags(sv, lp, flags) \
1667 (SvPOK_pure_nogthink(sv) \
1668 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvn_force_flags(sv, &lp, flags))
1670 #define SvPV_force_flags_nolen(sv, flags) \
1671 (SvPOK_pure_nogthink(sv) \
1672 ? SvPVX(sv) : sv_pvn_force_flags(sv, 0, flags))
1674 #define SvPV_force_flags_mutable(sv, lp, flags) \
1675 (SvPOK_pure_nogthink(sv) \
1676 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) \
1677 : sv_pvn_force_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1679 #define SvPV_nolen(sv) \
1681 ? SvPVX(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC))
1683 #define SvPV_nomg_nolen(sv) \
1685 ? SvPVX(sv) : sv_2pv_flags(sv, 0, 0))
1687 #define SvPV_nolen_const(sv) \
1689 ? SvPVX_const(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC|SV_CONST_RETURN))
1691 #define SvPV_nomg(sv, lp) SvPV_flags(sv, lp, 0)
1692 #define SvPV_nomg_const(sv, lp) SvPV_flags_const(sv, lp, 0)
1693 #define SvPV_nomg_const_nolen(sv) SvPV_flags_const_nolen(sv, 0)
1697 #define SvPVutf8(sv, lp) \
1698 (SvPOK_utf8_nog(sv) \
1699 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvutf8(sv, &lp))
1701 #define SvPVutf8_force(sv, lp) \
1702 (SvPOK_utf8_pure_nogthink(sv) \
1703 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvutf8n_force(sv, &lp))
1705 #define SvPVutf8_nolen(sv) \
1706 (SvPOK_utf8_nog(sv) \
1707 ? SvPVX(sv) : sv_2pvutf8(sv, 0))
1711 #define SvPVbyte(sv, lp) \
1712 (SvPOK_byte_nog(sv) \
1713 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvbyte(sv, &lp))
1715 #define SvPVbyte_force(sv, lp) \
1716 (SvPOK_byte_pure_nogthink(sv) \
1717 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvbyten_force(sv, &lp))
1719 #define SvPVbyte_nolen(sv) \
1720 (SvPOK_byte_nog(sv) \
1721 ? SvPVX(sv) : sv_2pvbyte(sv, 0))
1724 /* define FOOx(): idempotent versions of FOO(). If possible, use a local
1725 * var to evaluate the arg once; failing that, use a global if possible;
1726 * failing that, call a function to do the work
1729 #define SvPVx_force(sv, lp) sv_pvn_force(sv, &lp)
1730 #define SvPVutf8x_force(sv, lp) sv_pvutf8n_force(sv, &lp)
1731 #define SvPVbytex_force(sv, lp) sv_pvbyten_force(sv, &lp)
1733 #define SvTRUE(sv) ((sv) && (SvGMAGICAL(sv) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv))))
1734 #define SvTRUE_nomg(sv) ((sv) && ( SvTRUE_common(sv, sv_2bool_nomg(sv))))
1735 #define SvTRUE_common(sv,fallback) ( \
1738 : (SvFLAGS(sv) & (SVf_POK|SVf_IOK|SVf_NOK)) \
1739 ? ( (SvPOK(sv) && SvPVXtrue(sv)) \
1740 || (SvIOK(sv) && SvIVX(sv) != 0) \
1741 || (SvNOK(sv) && SvNVX(sv) != 0.0)) \
1744 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1746 # define SvIVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvIV(_sv); })
1747 # define SvUVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvUV(_sv); })
1748 # define SvNVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvNV(_sv); })
1749 # define SvPVx(sv, lp) ({SV *_sv = (sv); SvPV(_sv, lp); })
1750 # define SvPVx_const(sv, lp) ({SV *_sv = (sv); SvPV_const(_sv, lp); })
1751 # define SvPVx_nolen(sv) ({SV *_sv = (sv); SvPV_nolen(_sv); })
1752 # define SvPVx_nolen_const(sv) ({SV *_sv = (sv); SvPV_nolen_const(_sv); })
1753 # define SvPVutf8x(sv, lp) ({SV *_sv = (sv); SvPVutf8(_sv, lp); })
1754 # define SvPVbytex(sv, lp) ({SV *_sv = (sv); SvPVbyte(_sv, lp); })
1755 # define SvPVbytex_nolen(sv) ({SV *_sv = (sv); SvPVbyte_nolen(_sv); })
1756 # define SvTRUEx(sv) ({SV *_sv = (sv); SvTRUE(_sv); })
1757 # define SvTRUEx_nomg(sv) ({SV *_sv = (sv); SvTRUE_nomg(_sv); })
1758 # define SvPVXtrue(sv) \
1760 (nxpv = (XPV*)SvANY(sv)) \
1761 && (nxpv->xpv_cur > 1 \
1762 || (nxpv->xpv_cur && *(sv)->sv_u.svu_pv != '0'));})
1764 #else /* __GNUC__ */
1766 /* These inlined macros use globals, which will require a thread
1767 * declaration in user code, so we avoid them under threads */
1769 # define SvIVx(sv) ((PL_Sv = (sv)), SvIV(PL_Sv))
1770 # define SvUVx(sv) ((PL_Sv = (sv)), SvUV(PL_Sv))
1771 # define SvNVx(sv) ((PL_Sv = (sv)), SvNV(PL_Sv))
1772 # define SvPVx(sv, lp) ((PL_Sv = (sv)), SvPV(PL_Sv, lp))
1773 # define SvPVx_const(sv, lp) ((PL_Sv = (sv)), SvPV_const(PL_Sv, lp))
1774 # define SvPVx_nolen(sv) ((PL_Sv = (sv)), SvPV_nolen(PL_Sv))
1775 # define SvPVx_nolen_const(sv) ((PL_Sv = (sv)), SvPV_nolen_const(PL_Sv))
1776 # define SvPVutf8x(sv, lp) ((PL_Sv = (sv)), SvPVutf8(PL_Sv, lp))
1777 # define SvPVbytex(sv, lp) ((PL_Sv = (sv)), SvPVbyte(PL_Sv, lp))
1778 # define SvPVbytex_nolen(sv) ((PL_Sv = (sv)), SvPVbyte_nolen(PL_Sv))
1779 # define SvTRUEx(sv) ((PL_Sv = (sv)), SvTRUE(PL_Sv))
1780 # define SvTRUEx_nomg(sv) ((PL_Sv = (sv)), SvTRUE_nomg(PL_Sv))
1781 # define SvPVXtrue(sv) \
1782 ((PL_Xpv = (XPV*)SvANY(PL_Sv = (sv))) \
1783 && (PL_Xpv->xpv_cur > 1 \
1784 || (PL_Xpv->xpv_cur && *PL_Sv->sv_u.svu_pv != '0')))
1785 #endif /* __GNU__ */
1787 #define SvIsCOW(sv) ((SvFLAGS(sv) & (SVf_FAKE | SVf_READONLY)) == \
1788 (SVf_FAKE | SVf_READONLY) && !isGV_with_GP(sv) \
1789 && SvTYPE(sv) != SVt_REGEXP)
1790 #define SvIsCOW_shared_hash(sv) (SvIsCOW(sv) && SvLEN(sv) == 0)
1792 #define SvSHARED_HEK_FROM_PV(pvx) \
1793 ((struct hek*)(pvx - STRUCT_OFFSET(struct hek, hek_key)))
1794 #define SvSHARED_HASH(sv) (0 + SvSHARED_HEK_FROM_PV(SvPVX_const(sv))->hek_hash)
1796 /* flag values for sv_*_flags functions */
1797 #define SV_IMMEDIATE_UNREF 1
1799 #define SV_COW_DROP_PV 4
1800 #define SV_UTF8_NO_ENCODING 8
1801 #define SV_NOSTEAL 16
1802 #define SV_CONST_RETURN 32
1803 #define SV_MUTABLE_RETURN 64
1804 #define SV_SMAGIC 128
1805 #define SV_HAS_TRAILING_NUL 256
1806 #define SV_COW_SHARED_HASH_KEYS 512
1807 /* This one is only enabled for PERL_OLD_COPY_ON_WRITE */
1808 #define SV_COW_OTHER_PVS 1024
1809 /* Make sv_2pv_flags return NULL if something is undefined. */
1810 #define SV_UNDEF_RETURNS_NULL 2048
1811 /* Tell sv_utf8_upgrade() to not check to see if an upgrade is really needed.
1812 * This is used when the caller has already determined it is, and avoids
1814 #define SV_FORCE_UTF8_UPGRADE 4096
1815 /* if (after resolving magic etc), the SV is found to be overloaded,
1816 * don't call the overload magic, just return as-is */
1817 #define SV_SKIP_OVERLOAD 8192
1818 /* It is not yet clear whether we want this as an API, or what the
1819 * constants should be named. */
1821 # define SV_CATBYTES 16384
1822 # define SV_CATUTF8 32768
1825 /* The core is safe for this COW optimisation. XS code on CPAN may not be.
1826 So only default to doing the COW setup if we're in the core.
1829 # ifndef SV_DO_COW_SVSETSV
1830 # define SV_DO_COW_SVSETSV SV_COW_SHARED_HASH_KEYS|SV_COW_OTHER_PVS
1834 #ifndef SV_DO_COW_SVSETSV
1835 # define SV_DO_COW_SVSETSV 0
1839 #define sv_unref(sv) sv_unref_flags(sv, 0)
1840 #define sv_force_normal(sv) sv_force_normal_flags(sv, 0)
1841 #define sv_usepvn(sv, p, l) sv_usepvn_flags(sv, p, l, 0)
1842 #define sv_usepvn_mg(sv, p, l) sv_usepvn_flags(sv, p, l, SV_SMAGIC)
1844 /* We are about to replace the SV's current value. So if it's copy on write
1845 we need to normalise it. Use the SV_COW_DROP_PV flag hint to say that
1846 the value is about to get thrown away, so drop the PV rather than go to
1847 the effort of making a read-write copy only for it to get immediately
1850 #define SV_CHECK_THINKFIRST_COW_DROP(sv) if (SvTHINKFIRST(sv)) \
1851 sv_force_normal_flags(sv, SV_COW_DROP_PV)
1853 #ifdef PERL_OLD_COPY_ON_WRITE
1854 #define SvRELEASE_IVX(sv) \
1855 ((SvIsCOW(sv) ? sv_force_normal_flags(sv, 0) : (void) 0), 0)
1856 # define SvIsCOW_normal(sv) (SvIsCOW(sv) && SvLEN(sv))
1857 # define SvRELEASE_IVX_(sv) SvRELEASE_IVX(sv),
1859 # define SvRELEASE_IVX(sv) 0
1860 /* This little game brought to you by the need to shut this warning up:
1861 mg.c: In function 'Perl_magic_get':
1862 mg.c:1024: warning: left-hand operand of comma expression has no effect
1864 # define SvRELEASE_IVX_(sv) /**/
1865 #endif /* PERL_OLD_COPY_ON_WRITE */
1867 #define CAN_COW_MASK (SVs_OBJECT|SVs_GMG|SVs_SMG|SVs_RMG|SVf_IOK|SVf_NOK| \
1868 SVf_POK|SVf_ROK|SVp_IOK|SVp_NOK|SVp_POK|SVf_FAKE| \
1869 SVf_OOK|SVf_BREAK|SVf_READONLY)
1870 #define CAN_COW_FLAGS (SVp_POK|SVf_POK)
1872 #define SV_CHECK_THINKFIRST(sv) if (SvTHINKFIRST(sv)) \
1873 sv_force_normal_flags(sv, 0)
1876 /* all these 'functions' are now just macros */
1878 #define sv_pv(sv) SvPV_nolen(sv)
1879 #define sv_pvutf8(sv) SvPVutf8_nolen(sv)
1880 #define sv_pvbyte(sv) SvPVbyte_nolen(sv)
1882 #define sv_pvn_force_nomg(sv, lp) sv_pvn_force_flags(sv, lp, 0)
1883 #define sv_utf8_upgrade_flags(sv, flags) sv_utf8_upgrade_flags_grow(sv, flags, 0)
1884 #define sv_utf8_upgrade_nomg(sv) sv_utf8_upgrade_flags(sv, 0)
1885 #define sv_catpvn_nomg(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, 0)
1886 #define sv_catpv_nomg(dsv, sstr) sv_catpv_flags(dsv, sstr, 0)
1887 #define sv_setsv(dsv, ssv) \
1888 sv_setsv_flags(dsv, ssv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1889 #define sv_setsv_nomg(dsv, ssv) sv_setsv_flags(dsv, ssv, SV_DO_COW_SVSETSV)
1890 #define sv_catsv(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC)
1891 #define sv_catsv_nomg(dsv, ssv) sv_catsv_flags(dsv, ssv, 0)
1892 #define sv_catsv_mg(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC|SV_SMAGIC)
1893 #define sv_catpvn(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, SV_GMAGIC)
1894 #define sv_catpvn_mg(sv, sstr, slen) sv_catpvn_flags(sv, sstr, slen, SV_GMAGIC|SV_SMAGIC);
1895 #define sv_copypv(dsv, ssv) sv_copypv_flags(dsv, ssv, SV_GMAGIC)
1896 #define sv_copypv_nomg(dsv, ssv) sv_copypv_flags(dsv, ssv, 0)
1897 #define sv_2pv(sv, lp) sv_2pv_flags(sv, lp, SV_GMAGIC)
1898 #define sv_2pv_nolen(sv) sv_2pv(sv, 0)
1899 #define sv_2pvbyte_nolen(sv) sv_2pvbyte(sv, 0)
1900 #define sv_2pvutf8_nolen(sv) sv_2pvutf8(sv, 0)
1901 #define sv_2pv_nomg(sv, lp) sv_2pv_flags(sv, lp, 0)
1902 #define sv_pvn_force(sv, lp) sv_pvn_force_flags(sv, lp, SV_GMAGIC)
1903 #define sv_utf8_upgrade(sv) sv_utf8_upgrade_flags(sv, SV_GMAGIC)
1904 #define sv_2iv(sv) sv_2iv_flags(sv, SV_GMAGIC)
1905 #define sv_2uv(sv) sv_2uv_flags(sv, SV_GMAGIC)
1906 #define sv_2nv(sv) sv_2nv_flags(sv, SV_GMAGIC)
1907 #define sv_eq(sv1, sv2) sv_eq_flags(sv1, sv2, SV_GMAGIC)
1908 #define sv_cmp(sv1, sv2) sv_cmp_flags(sv1, sv2, SV_GMAGIC)
1909 #define sv_cmp_locale(sv1, sv2) sv_cmp_locale_flags(sv1, sv2, SV_GMAGIC)
1910 #define sv_collxfrm(sv, nxp) sv_cmp_flags(sv, nxp, SV_GMAGIC)
1911 #define sv_2bool(sv) sv_2bool_flags(sv, SV_GMAGIC)
1912 #define sv_2bool_nomg(sv) sv_2bool_flags(sv, 0)
1913 #define sv_insert(bigstr, offset, len, little, littlelen) \
1914 Perl_sv_insert_flags(aTHX_ (bigstr),(offset), (len), (little), \
1915 (littlelen), SV_GMAGIC)
1917 /* Should be named SvCatPVN_utf8_upgrade? */
1918 #define sv_catpvn_nomg_utf8_upgrade(dsv, sstr, slen, nsv) \
1921 nsv = newSVpvn_flags(sstr, slen, SVs_TEMP); \
1923 sv_setpvn(nsv, sstr, slen); \
1925 sv_utf8_upgrade(nsv); \
1926 sv_catsv_nomg(dsv, nsv); \
1930 =for apidoc Am|SV*|newRV_inc|SV* sv
1932 Creates an RV wrapper for an SV. The reference count for the original SV is
1938 #define newRV_inc(sv) newRV(sv)
1940 /* the following macros update any magic values this sv is associated with */
1943 =head1 Magical Functions
1945 =for apidoc Am|void|SvGETMAGIC|SV* sv
1946 Invokes C<mg_get> on an SV if it has 'get' magic. For example, this
1947 will call C<FETCH> on a tied variable. This macro evaluates its
1948 argument more than once.
1950 =for apidoc Am|void|SvSETMAGIC|SV* sv
1951 Invokes C<mg_set> on an SV if it has 'set' magic. This is necessary
1952 after modifying a scalar, in case it is a magical variable like C<$|>
1953 or a tied variable (it calls C<STORE>). This macro evaluates its
1954 argument more than once.
1956 =for apidoc Am|void|SvSetSV|SV* dsb|SV* ssv
1957 Calls C<sv_setsv> if dsv is not the same as ssv. May evaluate arguments
1960 =for apidoc Am|void|SvSetSV_nosteal|SV* dsv|SV* ssv
1961 Calls a non-destructive version of C<sv_setsv> if dsv is not the same as
1962 ssv. May evaluate arguments more than once.
1964 =for apidoc Am|void|SvSetMagicSV|SV* dsb|SV* ssv
1965 Like C<SvSetSV>, but does any set magic required afterwards.
1967 =for apidoc Am|void|SvSetMagicSV_nosteal|SV* dsv|SV* ssv
1968 Like C<SvSetSV_nosteal>, but does any set magic required afterwards.
1970 =for apidoc Am|void|SvSHARE|SV* sv
1971 Arranges for sv to be shared between threads if a suitable module
1974 =for apidoc Am|void|SvLOCK|SV* sv
1975 Arranges for a mutual exclusion lock to be obtained on sv if a suitable module
1978 =for apidoc Am|void|SvUNLOCK|SV* sv
1979 Releases a mutual exclusion lock on sv if a suitable module
1982 =head1 SV Manipulation Functions
1984 =for apidoc Am|char *|SvGROW|SV* sv|STRLEN len
1985 Expands the character buffer in the SV so that it has room for the
1986 indicated number of bytes (remember to reserve space for an extra trailing
1987 NUL character). Calls C<sv_grow> to perform the expansion if necessary.
1988 Returns a pointer to the character buffer.
1993 #define SvSHARE(sv) PL_sharehook(aTHX_ sv)
1994 #define SvLOCK(sv) PL_lockhook(aTHX_ sv)
1995 #define SvUNLOCK(sv) PL_unlockhook(aTHX_ sv)
1996 #define SvDESTROYABLE(sv) PL_destroyhook(aTHX_ sv)
1998 #define SvGETMAGIC(x) ((void)(SvGMAGICAL(x) && mg_get(x)))
1999 #define SvSETMAGIC(x) STMT_START { if (SvSMAGICAL(x)) mg_set(x); } STMT_END
2001 #define SvSetSV_and(dst,src,finally) \
2003 if ((dst) != (src)) { \
2004 sv_setsv(dst, src); \
2008 #define SvSetSV_nosteal_and(dst,src,finally) \
2010 if ((dst) != (src)) { \
2011 sv_setsv_flags(dst, src, SV_GMAGIC | SV_NOSTEAL | SV_DO_COW_SVSETSV); \
2016 #define SvSetSV(dst,src) \
2017 SvSetSV_and(dst,src,/*nothing*/;)
2018 #define SvSetSV_nosteal(dst,src) \
2019 SvSetSV_nosteal_and(dst,src,/*nothing*/;)
2021 #define SvSetMagicSV(dst,src) \
2022 SvSetSV_and(dst,src,SvSETMAGIC(dst))
2023 #define SvSetMagicSV_nosteal(dst,src) \
2024 SvSetSV_nosteal_and(dst,src,SvSETMAGIC(dst))
2027 #if !defined(SKIP_DEBUGGING)
2028 #define SvPEEK(sv) sv_peek(sv)
2030 #define SvPEEK(sv) ""
2033 #define SvIMMORTAL(sv) ((sv)==&PL_sv_undef || (sv)==&PL_sv_yes || (sv)==&PL_sv_no || (sv)==&PL_sv_placeholder)
2036 =for apidoc Am|SV *|boolSV|bool b
2038 Returns a true SV if C<b> is a true value, or a false SV if C<b> is 0.
2040 See also C<PL_sv_yes> and C<PL_sv_no>.
2045 #define boolSV(b) ((b) ? &PL_sv_yes : &PL_sv_no)
2047 #define isGV(sv) (SvTYPE(sv) == SVt_PVGV)
2048 /* If I give every macro argument a different name, then there won't be bugs
2049 where nested macros get confused. Been there, done that. */
2050 #define isGV_with_GP(pwadak) \
2051 (((SvFLAGS(pwadak) & (SVp_POK|SVpgv_GP)) == SVpgv_GP) \
2052 && (SvTYPE(pwadak) == SVt_PVGV || SvTYPE(pwadak) == SVt_PVLV))
2053 #define isGV_with_GP_on(sv) STMT_START { \
2054 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2055 assert (!SvPOKp(sv)); \
2056 assert (!SvIOKp(sv)); \
2057 (SvFLAGS(sv) |= SVpgv_GP); \
2059 #define isGV_with_GP_off(sv) STMT_START { \
2060 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
2061 assert (!SvPOKp(sv)); \
2062 assert (!SvIOKp(sv)); \
2063 (SvFLAGS(sv) &= ~SVpgv_GP); \
2067 #define SvGROW(sv,len) (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
2068 #define SvGROW_mutable(sv,len) \
2069 (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX_mutable(sv))
2070 #define Sv_Grow sv_grow
2072 #define CLONEf_COPY_STACKS 1
2073 #define CLONEf_KEEP_PTR_TABLE 2
2074 #define CLONEf_CLONE_HOST 4
2075 #define CLONEf_JOIN_IN 8
2077 struct clone_params {
2080 PerlInterpreter *proto_perl;
2081 PerlInterpreter *new_perl;
2086 =for apidoc Am|SV*|newSVpvn_utf8|NULLOK const char* s|STRLEN len|U32 utf8
2088 Creates a new SV and copies a string into it. If utf8 is true, calls
2089 C<SvUTF8_on> on the new SV. Implemented as a wrapper around C<newSVpvn_flags>.
2094 #define newSVpvn_utf8(s, len, u) newSVpvn_flags((s), (len), (u) ? SVf_UTF8 : 0)
2097 =for apidoc Am|void|SvOOK_offset|NN SV*sv|STRLEN len
2099 Reads into I<len> the offset from SvPVX back to the true start of the
2100 allocated buffer, which will be non-zero if C<sv_chop> has been used to
2101 efficiently remove characters from start of the buffer. Implemented as a
2102 macro, which takes the address of I<len>, which must be of type C<STRLEN>.
2103 Evaluates I<sv> more than once. Sets I<len> to 0 if C<SvOOK(sv)> is false.
2109 /* Does the bot know something I don't?
2110 10:28 <@Nicholas> metabatman
2111 10:28 <+meta> Nicholas: crash
2113 # define SvOOK_offset(sv, offset) STMT_START { \
2114 assert(sizeof(offset) == sizeof(STRLEN)); \
2116 const U8 *_crash = (U8*)SvPVX_const(sv); \
2117 (offset) = *--_crash; \
2119 _crash -= sizeof(STRLEN); \
2120 Copy(_crash, (U8 *)&(offset), sizeof(STRLEN), U8); \
2123 /* Validate the preceding buffer's sentinels to \
2124 verify that no-one is using it. */ \
2125 const U8 *const _bonk = (U8*)SvPVX_const(sv) - (offset);\
2126 while (_crash > _bonk) { \
2128 assert (*_crash == (U8)PTR2UV(_crash)); \
2136 /* This is the same code, but avoids using any temporary variables: */
2137 # define SvOOK_offset(sv, offset) STMT_START { \
2138 assert(sizeof(offset) == sizeof(STRLEN)); \
2140 (offset) = ((U8*)SvPVX_const(sv))[-1]; \
2142 Copy(SvPVX_const(sv) - 1 - sizeof(STRLEN), \
2143 (U8*)&(offset), sizeof(STRLEN), U8); \
2151 #define newIO() MUTABLE_IO(newSV_type(SVt_PVIO))
2155 * c-indentation-style: bsd
2157 * indent-tabs-mode: nil
2160 * ex: set ts=8 sts=4 sw=4 et: