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 #define SvREFCNT_inc(sv) S_SvREFCNT_inc(MUTABLE_SV(sv))
228 #define SvREFCNT_inc_simple(sv) SvREFCNT_inc(sv)
229 #define SvREFCNT_inc_NN(sv) S_SvREFCNT_inc_NN(MUTABLE_SV(sv))
230 #define SvREFCNT_inc_void(sv) S_SvREFCNT_inc_void(MUTABLE_SV(sv))
232 /* These guys don't need the curly blocks */
233 #define SvREFCNT_inc_simple_void(sv) STMT_START { if (sv) SvREFCNT(sv)++; } STMT_END
234 #define SvREFCNT_inc_simple_NN(sv) (++(SvREFCNT(sv)),MUTABLE_SV(sv))
235 #define SvREFCNT_inc_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
236 #define SvREFCNT_inc_simple_void_NN(sv) (void)(++SvREFCNT(MUTABLE_SV(sv)))
238 #define SvREFCNT_dec(sv) S_SvREFCNT_dec(aTHX_ MUTABLE_SV(sv))
240 #define SVTYPEMASK 0xff
241 #define SvTYPE(sv) ((svtype)((sv)->sv_flags & SVTYPEMASK))
243 /* Sadly there are some parts of the core that have pointers to already-freed
244 SV heads, and rely on being able to tell that they are now free. So mark
245 them all by using a consistent macro. */
246 #define SvIS_FREED(sv) ((sv)->sv_flags == SVTYPEMASK)
248 #define SvUPGRADE(sv, mt) (SvTYPE(sv) >= (mt) || (sv_upgrade(sv, mt), 1))
250 #define SVf_IOK 0x00000100 /* has valid public integer value */
251 #define SVf_NOK 0x00000200 /* has valid public numeric value */
252 #define SVf_POK 0x00000400 /* has valid public pointer value */
253 #define SVf_ROK 0x00000800 /* has a valid reference pointer */
255 #define SVp_IOK 0x00001000 /* has valid non-public integer value */
256 #define SVp_NOK 0x00002000 /* has valid non-public numeric value */
257 #define SVp_POK 0x00004000 /* has valid non-public pointer value */
258 #define SVp_SCREAM 0x00008000 /* method name is DOES */
259 #define SVphv_CLONEABLE SVp_SCREAM /* PVHV (stashes) clone its objects */
260 #define SVpgv_GP SVp_SCREAM /* GV has a valid GP */
261 #define SVprv_PCS_IMPORTED SVp_SCREAM /* RV is a proxy for a constant
262 subroutine in another package. Set the
263 GvIMPORTED_CV_on() if it needs to be
264 expanded to a real GV */
265 /* 0x00010000 *** FREE SLOT */
266 #define SVs_PADTMP 0x00020000 /* in use as tmp; only if ! SVs_PADMY */
267 #define SVs_PADSTALE 0x00020000 /* lexical has gone out of scope;
268 only valid for SVs_PADMY */
269 #define SVpad_TYPED 0x00020000 /* pad name is a Typed Lexical */
270 #define SVs_PADMY 0x00040000 /* in use a "my" variable */
271 #define SVpad_OUR 0x00040000 /* pad name is "our" instead of "my" */
272 #define SVs_TEMP 0x00080000 /* string is stealable? */
273 #define SVs_OBJECT 0x00100000 /* is "blessed" */
274 #define SVs_GMG 0x00200000 /* has magical get method */
275 #define SVs_SMG 0x00400000 /* has magical set method */
276 #define SVs_RMG 0x00800000 /* has random magical methods */
278 #define SVf_FAKE 0x01000000 /* 0: glob is just a copy
279 1: SV head arena wasn't malloc()ed
280 2: in conjunction with SVf_READONLY
281 marks a shared hash key scalar
282 (SvLEN == 0) or a copy on write
283 string (SvLEN != 0) [SvIsCOW(sv)]
284 3: For PVCV, whether CvUNIQUE(cv)
285 refers to an eval or once only
286 [CvEVAL(cv), CvSPECIAL(cv)]
287 4: On a pad name SV, that slot in the
288 frame AV is a REFCNT'ed reference
289 to a lexical from "outside". */
290 #define SVphv_REHASH SVf_FAKE /* 5: On a PVHV, hash values are being
292 #define SVf_OOK 0x02000000 /* has valid offset value. For a PVHV this
293 means that a hv_aux struct is present
294 after the main array */
295 #define SVf_BREAK 0x04000000 /* refcnt is artificially low - used by
296 SVs in final arena cleanup.
297 Set in S_regtry on PL_reg_curpm, so that
298 perl_destruct will skip it. */
299 #define SVf_READONLY 0x08000000 /* may not be modified */
304 #define SVf_THINKFIRST (SVf_READONLY|SVf_ROK|SVf_FAKE|SVs_RMG)
306 #define SVf_OK (SVf_IOK|SVf_NOK|SVf_POK|SVf_ROK| \
307 SVp_IOK|SVp_NOK|SVp_POK|SVpgv_GP)
309 #define PRIVSHIFT 4 /* (SVp_?OK >> PRIVSHIFT) == SVf_?OK */
311 #define SVf_AMAGIC 0x10000000 /* has magical overloaded methods */
313 /* Ensure this value does not clash with the GV_ADD* flags in gv.h: */
314 #define SVf_UTF8 0x20000000 /* SvPV is UTF-8 encoded
315 This is also set on RVs whose overloaded
316 stringification is UTF-8. This might
317 only happen as a side effect of SvPV() */
320 /* Some private flags. */
322 /* PVAV could probably use 0x2000000 without conflict. I assume that PVFM can
323 be UTF-8 encoded, and PVCVs could well have UTF-8 prototypes. PVIOs haven't
324 been restructured, so sometimes get used as string buffers. */
327 #define SVphv_SHAREKEYS 0x20000000 /* PVHV keys live on shared string table */
329 /* PVNV, PVMG only, and only used in pads. Should be safe to test on any scalar
330 SV, as the core is careful to avoid setting both.
332 SVf_POK, SVp_POK also set:
334 0x0000C400 method name for DOES (SvSCREAM)
335 0x40004400 FBM compiled (SvVALID)
338 0x00008000 GV with GP
339 0x00008800 RV with PCS imported
341 #define SVpad_NAME (SVp_SCREAM|SVpbm_VALID)
342 /* This SV is a name in the PAD, so
343 SVpad_TYPED, SVpad_OUR and SVpad_STATE
346 #define SVpav_REAL 0x40000000 /* free old entries */
348 #define SVphv_LAZYDEL 0x40000000 /* entry in xhv_eiter must be deleted */
349 /* This is only set true on a PVGV when it's playing "PVBM", but is tested for
350 on any regular scalar (anything <= PVLV) */
351 #define SVpbm_VALID 0x40000000
352 /* Only used in toke.c on an SV stored in PL_lex_repl */
353 #define SVrepl_EVAL 0x40000000 /* Replacement part of s///e */
355 /* IV, PVIV, PVNV, PVMG, PVGV and (I assume) PVLV */
356 #define SVf_IVisUV 0x80000000 /* use XPVUV instead of XPVIV */
358 #define SVpav_REIFY 0x80000000 /* can become real */
360 #define SVphv_HASKFLAGS 0x80000000 /* keys have flag byte after hash */
361 /* PVGV when SVpbm_VALID is true */
362 #define SVpbm_TAIL 0x80000000
363 /* RV upwards. However, SVf_ROK and SVp_IOK are exclusive */
364 #define SVprv_WEAKREF 0x80000000 /* Weak reference */
365 /* pad name vars only */
366 #define SVpad_STATE 0x80000000 /* pad name is a "state" var */
369 HV* xmg_stash; /* class package */ \
371 STRLEN xpv_cur; /* length of svu_pv as a C string */ \
372 STRLEN xpv_len /* allocated size */
375 NV xnv_nv; /* numeric value, if any */
380 } xpad_cop_seq; /* used by pad.c for cop_sequence */
383 U8 xbm_rare; /* rarest character in string */
384 } xbm_s; /* fields from PVBM */
388 IV xivu_iv; /* integer value */
390 HEK * xivu_namehek; /* xpvlv, xpvgv: GvNAME */
394 MAGIC* xmg_magic; /* linked list of magicalness */
395 HV* xmg_ourstash; /* Stash for our (when SvPAD_OUR is true) */
396 STRLEN xmg_hash_index; /* used while freeing hash entries */
408 #define xiv_iv xiv_u.xivu_iv
415 #define xuv_uv xuv_u.xivu_uv
423 /* This structure must match the beginning of struct xpvhv in hv.h. */
437 char xlv_type; /* k=keys .=pos x=substr v=vec /=join/re
438 * y=alem/helem/iter t=tie T=tied HE */
439 char xlv_flags; /* 1 = negative offset 2 = negative len */
442 /* This structure works in 3 ways - regular scalar, GV with GP, or fast
450 typedef U16 cv_flags_t;
452 #define _XPVCV_COMMON \
460 void (*xcv_xsub) (pTHX_ CV*); \
464 PADLIST * xcv_padlist; \
466 U32 xcv_outside_seq; /* the COP sequence (at the point of our \
467 * compilation) in the lexically enclosing \
469 cv_flags_t xcv_flags; \
470 I32 xcv_depth /* >= 2 indicates recursive call */
472 /* This structure must match XPVCV in cv.h */
483 /* ifp and ofp are normally the same, but sockets need separate streams */
485 /* Cray addresses everything by word boundaries (64 bits) and
486 * code and data pointers cannot be mixed (which is exactly what
487 * Perl_filter_add() tries to do with the dirp), hence the
488 * following union trick (as suggested by Gurusamy Sarathy).
489 * For further information see Geir Johansen's problem report
490 * titled [ID 20000612.002] Perl problem on Cray system
491 * The any pointer (known as IoANY()) will also be a good place
492 * to hang any IO disciplines to.
495 DIR * xiou_dirp; /* for opendir, readdir, etc */
496 void * xiou_any; /* for alignment */
498 /* IV xio_lines is now in IVX $. */
499 IV xio_page; /* $% */
500 IV xio_page_len; /* $= */
501 IV xio_lines_left; /* $- */
502 char * xio_top_name; /* $^ */
503 GV * xio_top_gv; /* $^ */
504 char * xio_fmt_name; /* $~ */
505 GV * xio_fmt_gv; /* $~ */
506 char * xio_bottom_name;/* $^B */
507 GV * xio_bottom_gv; /* $^B */
512 #define xio_dirp xio_dirpu.xiou_dirp
513 #define xio_any xio_dirpu.xiou_any
515 #define IOf_ARGV 1 /* this fp iterates over ARGV */
516 #define IOf_START 2 /* check for null ARGV and substitute '-' */
517 #define IOf_FLUSH 4 /* this fp wants a flush after write op */
518 #define IOf_DIDTOP 8 /* just did top of form */
519 #define IOf_UNTAINT 16 /* consider this fp (and its data) "safe" */
520 #define IOf_NOLINE 32 /* slurped a pseudo-line from empty file */
521 #define IOf_FAKE_DIRP 64 /* xio_dirp is fake (source filters kludge)
522 Also, when this is set, SvPVX() is valid */
524 /* The following macros define implementation-independent predicates on SVs. */
527 =for apidoc Am|U32|SvNIOK|SV* sv
528 Returns a U32 value indicating whether the SV contains a number, integer or
531 =for apidoc Am|U32|SvNIOKp|SV* sv
532 Returns a U32 value indicating whether the SV contains a number, integer or
533 double. Checks the B<private> setting. Use C<SvNIOK> instead.
535 =for apidoc Am|void|SvNIOK_off|SV* sv
536 Unsets the NV/IV status of an SV.
538 =for apidoc Am|U32|SvOK|SV* sv
539 Returns a U32 value indicating whether the value is defined. This is
540 only meaningful for scalars.
542 =for apidoc Am|U32|SvIOKp|SV* sv
543 Returns a U32 value indicating whether the SV contains an integer. Checks
544 the B<private> setting. Use C<SvIOK> instead.
546 =for apidoc Am|U32|SvNOKp|SV* sv
547 Returns a U32 value indicating whether the SV contains a double. Checks the
548 B<private> setting. Use C<SvNOK> instead.
550 =for apidoc Am|U32|SvPOKp|SV* sv
551 Returns a U32 value indicating whether the SV contains a character string.
552 Checks the B<private> setting. Use C<SvPOK> instead.
554 =for apidoc Am|U32|SvIOK|SV* sv
555 Returns a U32 value indicating whether the SV contains an integer.
557 =for apidoc Am|void|SvIOK_on|SV* sv
558 Tells an SV that it is an integer.
560 =for apidoc Am|void|SvIOK_off|SV* sv
561 Unsets the IV status of an SV.
563 =for apidoc Am|void|SvIOK_only|SV* sv
564 Tells an SV that it is an integer and disables all other OK bits.
566 =for apidoc Am|void|SvIOK_only_UV|SV* sv
567 Tells and SV that it is an unsigned integer and disables all other OK bits.
569 =for apidoc Am|bool|SvIOK_UV|SV* sv
570 Returns a boolean indicating whether the SV contains an unsigned integer.
572 =for apidoc Am|bool|SvUOK|SV* sv
573 Returns a boolean indicating whether the SV contains an unsigned integer.
575 =for apidoc Am|bool|SvIOK_notUV|SV* sv
576 Returns a boolean indicating whether the SV contains a signed integer.
578 =for apidoc Am|U32|SvNOK|SV* sv
579 Returns a U32 value indicating whether the SV contains a double.
581 =for apidoc Am|void|SvNOK_on|SV* sv
582 Tells an SV that it is a double.
584 =for apidoc Am|void|SvNOK_off|SV* sv
585 Unsets the NV status of an SV.
587 =for apidoc Am|void|SvNOK_only|SV* sv
588 Tells an SV that it is a double and disables all other OK bits.
590 =for apidoc Am|U32|SvPOK|SV* sv
591 Returns a U32 value indicating whether the SV contains a character
594 =for apidoc Am|void|SvPOK_on|SV* sv
595 Tells an SV that it is a string.
597 =for apidoc Am|void|SvPOK_off|SV* sv
598 Unsets the PV status of an SV.
600 =for apidoc Am|void|SvPOK_only|SV* sv
601 Tells an SV that it is a string and disables all other OK bits.
602 Will also turn off the UTF-8 status.
604 =for apidoc Am|bool|SvVOK|SV* sv
605 Returns a boolean indicating whether the SV contains a v-string.
607 =for apidoc Am|U32|SvOOK|SV* sv
608 Returns a U32 indicating whether the pointer to the string buffer is offset.
609 This hack is used internally to speed up removal of characters from the
610 beginning of a SvPV. When SvOOK is true, then the start of the
611 allocated string buffer is actually C<SvOOK_offset()> bytes before SvPVX.
612 This offset used to be stored in SvIVX, but is now stored within the spare
615 =for apidoc Am|U32|SvROK|SV* sv
616 Tests if the SV is an RV.
618 =for apidoc Am|void|SvROK_on|SV* sv
619 Tells an SV that it is an RV.
621 =for apidoc Am|void|SvROK_off|SV* sv
622 Unsets the RV status of an SV.
624 =for apidoc Am|SV*|SvRV|SV* sv
625 Dereferences an RV to return the SV.
627 =for apidoc Am|IV|SvIVX|SV* sv
628 Returns the raw value in the SV's IV slot, without checks or conversions.
629 Only use when you are sure SvIOK is true. See also C<SvIV()>.
631 =for apidoc Am|UV|SvUVX|SV* sv
632 Returns the raw value in the SV's UV slot, without checks or conversions.
633 Only use when you are sure SvIOK is true. See also C<SvUV()>.
635 =for apidoc Am|NV|SvNVX|SV* sv
636 Returns the raw value in the SV's NV slot, without checks or conversions.
637 Only use when you are sure SvNOK is true. See also C<SvNV()>.
639 =for apidoc Am|char*|SvPVX|SV* sv
640 Returns a pointer to the physical string in the SV. The SV must contain a
643 This is also used to store the name of an autoloaded subroutine in an XS
644 AUTOLOAD routine. See L<perlguts/Autoloading with XSUBs>.
646 =for apidoc Am|STRLEN|SvCUR|SV* sv
647 Returns the length of the string which is in the SV. See C<SvLEN>.
649 =for apidoc Am|STRLEN|SvLEN|SV* sv
650 Returns the size of the string buffer in the SV, not including any part
651 attributable to C<SvOOK>. See C<SvCUR>.
653 =for apidoc Am|char*|SvEND|SV* sv
654 Returns a pointer to the spot just after the last character in
655 the string which is in the SV, where there is usually a trailing
656 null (even though Perl scalars do not strictly require it).
657 See C<SvCUR>. Access the character as *(SvEND(sv)).
659 Warning: If C<SvCUR> is equal to C<SvLEN>, then C<SvEND> points to
662 =for apidoc Am|HV*|SvSTASH|SV* sv
663 Returns the stash of the SV.
665 =for apidoc Am|void|SvIV_set|SV* sv|IV val
666 Set the value of the IV pointer in sv to val. It is possible to perform
667 the same function of this macro with an lvalue assignment to C<SvIVX>.
668 With future Perls, however, it will be more efficient to use
669 C<SvIV_set> instead of the lvalue assignment to C<SvIVX>.
671 =for apidoc Am|void|SvNV_set|SV* sv|NV val
672 Set the value of the NV pointer in sv to val. See C<SvIV_set>.
674 =for apidoc Am|void|SvPV_set|SV* sv|char* val
675 Set the value of the PV pointer in sv to val. See C<SvIV_set>.
677 =for apidoc Am|void|SvUV_set|SV* sv|UV val
678 Set the value of the UV pointer in sv to val. See C<SvIV_set>.
680 =for apidoc Am|void|SvRV_set|SV* sv|SV* val
681 Set the value of the RV pointer in sv to val. See C<SvIV_set>.
683 =for apidoc Am|void|SvMAGIC_set|SV* sv|MAGIC* val
684 Set the value of the MAGIC pointer in sv to val. See C<SvIV_set>.
686 =for apidoc Am|void|SvSTASH_set|SV* sv|HV* val
687 Set the value of the STASH pointer in sv to val. See C<SvIV_set>.
689 =for apidoc Am|void|SvCUR_set|SV* sv|STRLEN len
690 Set the current length of the string which is in the SV. See C<SvCUR>
693 =for apidoc Am|void|SvLEN_set|SV* sv|STRLEN len
694 Set the actual length of the string which is in the SV. See C<SvIV_set>.
699 #define SvNIOK(sv) (SvFLAGS(sv) & (SVf_IOK|SVf_NOK))
700 #define SvNIOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK))
701 #define SvNIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK| \
702 SVp_IOK|SVp_NOK|SVf_IVisUV))
704 #define assert_not_ROK(sv) assert_(!SvROK(sv) || !SvRV(sv))
705 #define assert_not_glob(sv) assert_(!isGV_with_GP(sv))
707 #define SvOK(sv) ((SvTYPE(sv) == SVt_BIND) \
708 ? (SvFLAGS(SvRV(sv)) & SVf_OK) \
709 : (SvFLAGS(sv) & SVf_OK))
710 #define SvOK_off(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
711 SvFLAGS(sv) &= ~(SVf_OK| \
712 SVf_IVisUV|SVf_UTF8), \
714 #define SvOK_off_exc_UV(sv) (assert_not_ROK(sv) \
715 SvFLAGS(sv) &= ~(SVf_OK| \
719 #define SvOKp(sv) (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK))
720 #define SvIOKp(sv) (SvFLAGS(sv) & SVp_IOK)
721 #define SvIOKp_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
722 SvFLAGS(sv) |= SVp_IOK)
723 #define SvNOKp(sv) (SvFLAGS(sv) & SVp_NOK)
724 #define SvNOKp_on(sv) (assert_not_glob(sv) SvFLAGS(sv) |= SVp_NOK)
725 #define SvPOKp(sv) (SvFLAGS(sv) & SVp_POK)
726 #define SvPOKp_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
727 SvFLAGS(sv) |= SVp_POK)
729 #define SvIOK(sv) (SvFLAGS(sv) & SVf_IOK)
730 #define SvIOK_on(sv) (assert_not_glob(sv) SvRELEASE_IVX_(sv) \
731 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
732 #define SvIOK_off(sv) (SvFLAGS(sv) &= ~(SVf_IOK|SVp_IOK|SVf_IVisUV))
733 #define SvIOK_only(sv) (SvOK_off(sv), \
734 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
735 #define SvIOK_only_UV(sv) (assert_not_glob(sv) SvOK_off_exc_UV(sv), \
736 SvFLAGS(sv) |= (SVf_IOK|SVp_IOK))
738 #define SvIOK_UV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
739 == (SVf_IOK|SVf_IVisUV))
740 #define SvUOK(sv) SvIOK_UV(sv)
741 #define SvIOK_notUV(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV)) \
744 #define SvIsUV(sv) (SvFLAGS(sv) & SVf_IVisUV)
745 #define SvIsUV_on(sv) (SvFLAGS(sv) |= SVf_IVisUV)
746 #define SvIsUV_off(sv) (SvFLAGS(sv) &= ~SVf_IVisUV)
748 #define SvNOK(sv) (SvFLAGS(sv) & SVf_NOK)
749 #define SvNOK_on(sv) (assert_not_glob(sv) \
750 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
751 #define SvNOK_off(sv) (SvFLAGS(sv) &= ~(SVf_NOK|SVp_NOK))
752 #define SvNOK_only(sv) (SvOK_off(sv), \
753 SvFLAGS(sv) |= (SVf_NOK|SVp_NOK))
756 =for apidoc Am|U32|SvUTF8|SV* sv
757 Returns a U32 value indicating the UTF-8 status of an SV. If things are set-up
758 properly, this indicates whether or not the SV contains UTF-8 encoded data.
759 Call this after SvPV() in case any call to string overloading updates the
762 =for apidoc Am|void|SvUTF8_on|SV *sv
763 Turn on the UTF-8 status of an SV (the data is not changed, just the flag).
764 Do not use frivolously.
766 =for apidoc Am|void|SvUTF8_off|SV *sv
767 Unsets the UTF-8 status of an SV (the data is not changed, just the flag).
768 Do not use frivolously.
770 =for apidoc Am|void|SvPOK_only_UTF8|SV* sv
771 Tells an SV that it is a string and disables all other OK bits,
772 and leaves the UTF-8 status as it was.
777 /* Ensure the return value of this macro does not clash with the GV_ADD* flags
779 #define SvUTF8(sv) (SvFLAGS(sv) & SVf_UTF8)
780 #define SvUTF8_on(sv) (SvFLAGS(sv) |= (SVf_UTF8))
781 #define SvUTF8_off(sv) (SvFLAGS(sv) &= ~(SVf_UTF8))
783 #define SvPOK(sv) (SvFLAGS(sv) & SVf_POK)
784 #define SvPOK_on(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
785 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
786 #define SvPOK_off(sv) (SvFLAGS(sv) &= ~(SVf_POK|SVp_POK))
787 #define SvPOK_only(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
788 SvFLAGS(sv) &= ~(SVf_OK| \
789 SVf_IVisUV|SVf_UTF8), \
790 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
791 #define SvPOK_only_UTF8(sv) (assert_not_ROK(sv) assert_not_glob(sv) \
792 SvFLAGS(sv) &= ~(SVf_OK| \
794 SvFLAGS(sv) |= (SVf_POK|SVp_POK))
796 #define SvVOK(sv) (SvMAGICAL(sv) \
797 && mg_find(sv,PERL_MAGIC_vstring))
798 /* returns the vstring magic, if any */
799 #define SvVSTRING_mg(sv) (SvMAGICAL(sv) \
800 ? mg_find(sv,PERL_MAGIC_vstring) : NULL)
802 #define SvOOK(sv) (SvFLAGS(sv) & SVf_OOK)
803 #define SvOOK_on(sv) (SvFLAGS(sv) |= SVf_OOK)
804 #define SvOOK_off(sv) ((void)(SvOOK(sv) && sv_backoff(sv)))
806 #define SvFAKE(sv) (SvFLAGS(sv) & SVf_FAKE)
807 #define SvFAKE_on(sv) (SvFLAGS(sv) |= SVf_FAKE)
808 #define SvFAKE_off(sv) (SvFLAGS(sv) &= ~SVf_FAKE)
810 #define SvROK(sv) (SvFLAGS(sv) & SVf_ROK)
811 #define SvROK_on(sv) (SvFLAGS(sv) |= SVf_ROK)
812 #define SvROK_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK))
814 #define SvMAGICAL(sv) (SvFLAGS(sv) & (SVs_GMG|SVs_SMG|SVs_RMG))
815 #define SvMAGICAL_on(sv) (SvFLAGS(sv) |= (SVs_GMG|SVs_SMG|SVs_RMG))
816 #define SvMAGICAL_off(sv) (SvFLAGS(sv) &= ~(SVs_GMG|SVs_SMG|SVs_RMG))
818 #define SvGMAGICAL(sv) (SvFLAGS(sv) & SVs_GMG)
819 #define SvGMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_GMG)
820 #define SvGMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_GMG)
822 #define SvSMAGICAL(sv) (SvFLAGS(sv) & SVs_SMG)
823 #define SvSMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_SMG)
824 #define SvSMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_SMG)
826 #define SvRMAGICAL(sv) (SvFLAGS(sv) & SVs_RMG)
827 #define SvRMAGICAL_on(sv) (SvFLAGS(sv) |= SVs_RMG)
828 #define SvRMAGICAL_off(sv) (SvFLAGS(sv) &= ~SVs_RMG)
830 #define SvAMAGIC(sv) (SvROK(sv) && SvOBJECT(SvRV(sv)) && \
831 HvAMAGIC(SvSTASH(SvRV(sv))))
833 /* To be used on the stashes themselves: */
834 #define HvAMAGIC(hv) (SvFLAGS(hv) & SVf_AMAGIC)
835 #define HvAMAGIC_on(hv) (SvFLAGS(hv) |= SVf_AMAGIC)
836 #define HvAMAGIC_off(hv) (SvFLAGS(hv) &=~ SVf_AMAGIC)
839 #define SvPOK_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVs_GMG)) == SVf_POK)
840 #define SvIOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVs_GMG)) == SVf_IOK)
841 #define SvUOK_nog(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
842 #define SvNOK_nog(sv) ((SvFLAGS(sv) & (SVf_NOK|SVs_GMG)) == SVf_NOK)
843 #define SvNIOK_nog(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & SVs_GMG))
845 #define SvPOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
846 #define SvIOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_THINKFIRST|SVs_GMG)) == SVf_IOK)
847 #define SvUOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_IOK|SVf_IVisUV|SVf_THINKFIRST|SVs_GMG)) == (SVf_IOK|SVf_IVisUV))
848 #define SvNOK_nogthink(sv) ((SvFLAGS(sv) & (SVf_NOK|SVf_THINKFIRST|SVs_GMG)) == SVf_NOK)
849 #define SvNIOK_nogthink(sv) (SvNIOK(sv) && !(SvFLAGS(sv) & (SVf_THINKFIRST|SVs_GMG)))
851 #define SvPOK_utf8_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == (SVf_POK|SVf_UTF8))
852 #define SvPOK_utf8_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
854 #define SvPOK_byte_nog(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVs_GMG)) == SVf_POK)
855 #define SvPOK_byte_nogthink(sv) ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
857 #define SvPOK_pure_nogthink(sv) \
858 ((SvFLAGS(sv) & (SVf_POK|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
859 #define SvPOK_utf8_pure_nogthink(sv) \
860 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == (SVf_POK|SVf_UTF8))
861 #define SvPOK_byte_pure_nogthink(sv) \
862 ((SvFLAGS(sv) & (SVf_POK|SVf_UTF8|SVf_IOK|SVf_NOK|SVf_ROK|SVpgv_GP|SVf_THINKFIRST|SVs_GMG)) == SVf_POK)
865 =for apidoc Am|U32|SvGAMAGIC|SV* sv
867 Returns true if the SV has get magic or
868 overloading. If either is true then
869 the scalar is active data, and has the potential to return a new value every
870 time it is accessed. Hence you must be careful to
871 only read it once per user logical operation and work
872 with that returned value. If neither is true then
873 the scalar's value cannot change unless written to.
878 #define SvGAMAGIC(sv) (SvGMAGICAL(sv) || SvAMAGIC(sv))
880 #define Gv_AMG(stash) \
881 (HvNAME(stash) && Gv_AMupdate(stash,FALSE) \
883 : (HvAMAGIC_off(stash), 0))
885 #define SvWEAKREF(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_WEAKREF)) \
886 == (SVf_ROK|SVprv_WEAKREF))
887 #define SvWEAKREF_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_WEAKREF))
888 #define SvWEAKREF_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_WEAKREF))
890 #define SvPCS_IMPORTED(sv) ((SvFLAGS(sv) & (SVf_ROK|SVprv_PCS_IMPORTED)) \
891 == (SVf_ROK|SVprv_PCS_IMPORTED))
892 #define SvPCS_IMPORTED_on(sv) (SvFLAGS(sv) |= (SVf_ROK|SVprv_PCS_IMPORTED))
893 #define SvPCS_IMPORTED_off(sv) (SvFLAGS(sv) &= ~(SVf_ROK|SVprv_PCS_IMPORTED))
896 =for apidoc m|U32|SvTHINKFIRST|SV *sv
898 A quick flag check to see whether an sv should be passed to sv_force_normal
899 to be "downgraded" before SvIVX or SvPVX can be modified directly.
901 For example, if your scalar is a reference and you want to modify the SvIVX
902 slot, you can't just do SvROK_off, as that will leak the referent.
904 This is used internally by various sv-modifying functions, such as
905 sv_setsv, sv_setiv and sv_pvn_force.
907 One case that this does not handle is a gv without SvFAKE set. After
909 if (SvTHINKFIRST(gv)) sv_force_normal(gv);
911 it will still be a gv.
913 SvTHINKFIRST sometimes produces false positives. In those cases
914 sv_force_normal does nothing.
919 #define SvTHINKFIRST(sv) (SvFLAGS(sv) & SVf_THINKFIRST)
921 #define SvPADMY(sv) (SvFLAGS(sv) & SVs_PADMY)
922 #define SvPADMY_on(sv) (SvFLAGS(sv) |= SVs_PADMY)
924 /* SVs_PADTMP and SVs_PADSTALE share the same bit, mediated by SVs_PADMY */
926 #define SvPADTMP(sv) ((SvFLAGS(sv) & (SVs_PADMY|SVs_PADTMP)) == SVs_PADTMP)
927 #define SvPADSTALE(sv) ((SvFLAGS(sv) & (SVs_PADMY|SVs_PADSTALE)) \
928 == (SVs_PADMY|SVs_PADSTALE))
930 #define SvPADTMP_on(sv) S_SvPADTMP_on(MUTABLE_SV(sv))
931 #define SvPADTMP_off(sv) S_SvPADTMP_off(MUTABLE_SV(sv))
932 #define SvPADSTALE_on(sv) S_SvPADSTALE_on(MUTABLE_SV(sv))
933 #define SvPADSTALE_off(sv) S_SvPADSTALE_off(MUTABLE_SV(sv))
935 #define SvTEMP(sv) (SvFLAGS(sv) & SVs_TEMP)
936 #define SvTEMP_on(sv) (SvFLAGS(sv) |= SVs_TEMP)
937 #define SvTEMP_off(sv) (SvFLAGS(sv) &= ~SVs_TEMP)
939 #define SvOBJECT(sv) (SvFLAGS(sv) & SVs_OBJECT)
940 #define SvOBJECT_on(sv) (SvFLAGS(sv) |= SVs_OBJECT)
941 #define SvOBJECT_off(sv) (SvFLAGS(sv) &= ~SVs_OBJECT)
943 #define SvREADONLY(sv) (SvFLAGS(sv) & SVf_READONLY)
944 #define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
945 #define SvREADONLY_off(sv) (SvFLAGS(sv) &= ~SVf_READONLY)
947 #define SvSCREAM(sv) ((SvFLAGS(sv) & (SVp_SCREAM|SVp_POK)) == (SVp_SCREAM|SVp_POK))
948 #define SvSCREAM_on(sv) (SvFLAGS(sv) |= SVp_SCREAM)
949 #define SvSCREAM_off(sv) (SvFLAGS(sv) &= ~SVp_SCREAM)
952 # define SvCOMPILED(sv) 0
953 # define SvCOMPILED_on(sv)
954 # define SvCOMPILED_off(sv)
957 #define SvEVALED(sv) (SvFLAGS(sv) & SVrepl_EVAL)
958 #define SvEVALED_on(sv) (SvFLAGS(sv) |= SVrepl_EVAL)
959 #define SvEVALED_off(sv) (SvFLAGS(sv) &= ~SVrepl_EVAL)
961 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
962 # define SvVALID(sv) ({ const SV *const _svvalid = (const SV*)(sv); \
963 if (SvFLAGS(_svvalid) & SVpbm_VALID) \
964 assert(!isGV_with_GP(_svvalid)); \
965 (SvFLAGS(_svvalid) & SVpbm_VALID); \
967 # define SvVALID_on(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
968 assert(!isGV_with_GP(_svvalid)); \
969 (SvFLAGS(_svvalid) |= SVpbm_VALID); \
971 # define SvVALID_off(sv) ({ SV *const _svvalid = MUTABLE_SV(sv); \
972 assert(!isGV_with_GP(_svvalid)); \
973 (SvFLAGS(_svvalid) &= ~SVpbm_VALID); \
976 # define SvTAIL(sv) ({ const SV *const _svtail = (const SV *)(sv); \
977 assert(SvTYPE(_svtail) != SVt_PVAV); \
978 assert(SvTYPE(_svtail) != SVt_PVHV); \
979 (SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
980 == (SVpbm_TAIL|SVpbm_VALID); \
983 # define SvVALID(sv) (SvFLAGS(sv) & SVpbm_VALID)
984 # define SvVALID_on(sv) (SvFLAGS(sv) |= SVpbm_VALID)
985 # define SvVALID_off(sv) (SvFLAGS(sv) &= ~SVpbm_VALID)
986 # define SvTAIL(sv) ((SvFLAGS(sv) & (SVpbm_TAIL|SVpbm_VALID)) \
987 == (SVpbm_TAIL|SVpbm_VALID))
990 #define SvTAIL_on(sv) (SvFLAGS(sv) |= SVpbm_TAIL)
991 #define SvTAIL_off(sv) (SvFLAGS(sv) &= ~SVpbm_TAIL)
994 #define SvPAD_TYPED(sv) \
995 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_TYPED)) == (SVpad_NAME|SVpad_TYPED))
997 #define SvPAD_OUR(sv) \
998 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_OUR)) == (SVpad_NAME|SVpad_OUR))
1000 #define SvPAD_STATE(sv) \
1001 ((SvFLAGS(sv) & (SVpad_NAME|SVpad_STATE)) == (SVpad_NAME|SVpad_STATE))
1003 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1004 # define SvPAD_TYPED_on(sv) ({ \
1005 SV *const _svpad = MUTABLE_SV(sv); \
1006 assert(SvTYPE(_svpad) == SVt_PVMG); \
1007 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_TYPED); \
1009 #define SvPAD_OUR_on(sv) ({ \
1010 SV *const _svpad = MUTABLE_SV(sv); \
1011 assert(SvTYPE(_svpad) == SVt_PVMG); \
1012 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_OUR); \
1014 #define SvPAD_STATE_on(sv) ({ \
1015 SV *const _svpad = MUTABLE_SV(sv); \
1016 assert(SvTYPE(_svpad) == SVt_PVNV || SvTYPE(_svpad) == SVt_PVMG); \
1017 (SvFLAGS(_svpad) |= SVpad_NAME|SVpad_STATE); \
1020 # define SvPAD_TYPED_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_TYPED)
1021 # define SvPAD_OUR_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_OUR)
1022 # define SvPAD_STATE_on(sv) (SvFLAGS(sv) |= SVpad_NAME|SVpad_STATE)
1025 #define SvOURSTASH(sv) \
1026 (SvPAD_OUR(sv) ? ((XPVMG*) SvANY(sv))->xmg_u.xmg_ourstash : NULL)
1027 #define SvOURSTASH_set(sv, st) \
1029 assert(SvTYPE(sv) == SVt_PVMG); \
1030 ((XPVMG*) SvANY(sv))->xmg_u.xmg_ourstash = st; \
1033 #define SvRVx(sv) SvRV(sv)
1035 #ifdef PERL_DEBUG_COW
1036 /* Need -0.0 for SvNVX to preserve IEEE FP "negative zero" because
1037 +0.0 + -0.0 => +0.0 but -0.0 + -0.0 => -0.0 */
1038 # define SvIVX(sv) (0 + ((XPVIV*) SvANY(sv))->xiv_iv)
1039 # define SvUVX(sv) (0 + ((XPVUV*) SvANY(sv))->xuv_uv)
1040 # define SvNVX(sv) (-0.0 + ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv)
1041 # define SvRV(sv) (0 + (sv)->sv_u.svu_rv)
1042 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1043 /* Don't test the core XS code yet. */
1044 # if defined (PERL_CORE) && PERL_DEBUG_COW > 1
1045 # define SvPVX(sv) (0 + (assert_(!SvREADONLY(sv)) (sv)->sv_u.svu_pv))
1047 # define SvPVX(sv) SvPVX_mutable(sv)
1049 # define SvCUR(sv) (0 + ((XPV*) SvANY(sv))->xpv_cur)
1050 # define SvLEN(sv) (0 + ((XPV*) SvANY(sv))->xpv_len)
1051 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1053 # define SvMAGIC(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_u.xmg_magic))
1054 # define SvSTASH(sv) (0 + *(assert_(SvTYPE(sv) >= SVt_PVMG) &((XPVMG*) SvANY(sv))->xmg_stash))
1056 # define SvLEN(sv) ((XPV*) SvANY(sv))->xpv_len
1057 # define SvEND(sv) ((sv)->sv_u.svu_pv + ((XPV*)SvANY(sv))->xpv_cur)
1059 # if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1060 /* These get expanded inside other macros that already use a variable _sv */
1061 # define SvPVX(sv) \
1062 (*({ SV *const _svpvx = MUTABLE_SV(sv); \
1063 assert(PL_valid_types_PVX[SvTYPE(_svpvx) & SVt_MASK]); \
1064 assert(!isGV_with_GP(_svpvx)); \
1065 assert(!(SvTYPE(_svpvx) == SVt_PVIO \
1066 && !(IoFLAGS(_svpvx) & IOf_FAKE_DIRP))); \
1067 &((_svpvx)->sv_u.svu_pv); \
1069 # define SvCUR(sv) \
1070 (*({ const SV *const _svcur = (const SV *)(sv); \
1071 assert(PL_valid_types_PVX[SvTYPE(_svcur) & SVt_MASK]); \
1072 assert(!isGV_with_GP(_svcur)); \
1073 assert(!(SvTYPE(_svcur) == SVt_PVIO \
1074 && !(IoFLAGS(_svcur) & IOf_FAKE_DIRP))); \
1075 &(((XPV*) MUTABLE_PTR(SvANY(_svcur)))->xpv_cur); \
1077 # define SvIVX(sv) \
1078 (*({ const SV *const _svivx = (const SV *)(sv); \
1079 assert(PL_valid_types_IVX[SvTYPE(_svivx) & SVt_MASK]); \
1080 assert(!isGV_with_GP(_svivx)); \
1081 &(((XPVIV*) MUTABLE_PTR(SvANY(_svivx)))->xiv_iv); \
1083 # define SvUVX(sv) \
1084 (*({ const SV *const _svuvx = (const SV *)(sv); \
1085 assert(PL_valid_types_IVX[SvTYPE(_svuvx) & SVt_MASK]); \
1086 assert(!isGV_with_GP(_svuvx)); \
1087 &(((XPVUV*) MUTABLE_PTR(SvANY(_svuvx)))->xuv_uv); \
1089 # define SvNVX(sv) \
1090 (*({ const SV *const _svnvx = (const SV *)(sv); \
1091 assert(PL_valid_types_NVX[SvTYPE(_svnvx) & SVt_MASK]); \
1092 assert(!isGV_with_GP(_svnvx)); \
1093 &(((XPVNV*) MUTABLE_PTR(SvANY(_svnvx)))->xnv_u.xnv_nv); \
1096 (*({ SV *const _svrv = MUTABLE_SV(sv); \
1097 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1098 assert(!isGV_with_GP(_svrv)); \
1099 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1100 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1101 &((_svrv)->sv_u.svu_rv); \
1103 # define SvRV_const(sv) \
1104 ({ const SV *const _svrv = (const SV *)(sv); \
1105 assert(PL_valid_types_RV[SvTYPE(_svrv) & SVt_MASK]); \
1106 assert(!isGV_with_GP(_svrv)); \
1107 assert(!(SvTYPE(_svrv) == SVt_PVIO \
1108 && !(IoFLAGS(_svrv) & IOf_FAKE_DIRP))); \
1109 (_svrv)->sv_u.svu_rv; \
1111 # define SvMAGIC(sv) \
1112 (*({ const SV *const _svmagic = (const SV *)(sv); \
1113 assert(SvTYPE(_svmagic) >= SVt_PVMG); \
1114 if(SvTYPE(_svmagic) == SVt_PVMG) \
1115 assert(!SvPAD_OUR(_svmagic)); \
1116 &(((XPVMG*) MUTABLE_PTR(SvANY(_svmagic)))->xmg_u.xmg_magic); \
1118 # define SvSTASH(sv) \
1119 (*({ const SV *const _svstash = (const SV *)(sv); \
1120 assert(SvTYPE(_svstash) >= SVt_PVMG); \
1121 &(((XPVMG*) MUTABLE_PTR(SvANY(_svstash)))->xmg_stash); \
1124 # define SvPVX(sv) ((sv)->sv_u.svu_pv)
1125 # define SvCUR(sv) ((XPV*) SvANY(sv))->xpv_cur
1126 # define SvIVX(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1127 # define SvUVX(sv) ((XPVUV*) SvANY(sv))->xuv_uv
1128 # define SvNVX(sv) ((XPVNV*) SvANY(sv))->xnv_u.xnv_nv
1129 # define SvRV(sv) ((sv)->sv_u.svu_rv)
1130 # define SvRV_const(sv) (0 + (sv)->sv_u.svu_rv)
1131 # define SvMAGIC(sv) ((XPVMG*) SvANY(sv))->xmg_u.xmg_magic
1132 # define SvSTASH(sv) ((XPVMG*) SvANY(sv))->xmg_stash
1137 /* Given that these two are new, there can't be any existing code using them
1139 # define SvPVX_mutable(sv) (0 + (sv)->sv_u.svu_pv)
1140 # define SvPVX_const(sv) ((const char*)(0 + (sv)->sv_u.svu_pv))
1142 /* Except for the poison code, which uses & to scribble over the pointer after
1143 free() is called. */
1144 # define SvPVX_mutable(sv) ((sv)->sv_u.svu_pv)
1145 # define SvPVX_const(sv) ((const char*)((sv)->sv_u.svu_pv))
1148 #define SvIVXx(sv) SvIVX(sv)
1149 #define SvUVXx(sv) SvUVX(sv)
1150 #define SvNVXx(sv) SvNVX(sv)
1151 #define SvPVXx(sv) SvPVX(sv)
1152 #define SvLENx(sv) SvLEN(sv)
1153 #define SvENDx(sv) ((PL_Sv = (sv)), SvEND(PL_Sv))
1156 /* Ask a scalar nicely to try to become an IV, if possible.
1157 Not guaranteed to stay returning void */
1158 /* Macro won't actually call sv_2iv if already IOK */
1159 #define SvIV_please(sv) \
1160 STMT_START {if (!SvIOKp(sv) && (SvNOK(sv) || SvPOK(sv))) \
1161 (void) SvIV(sv); } STMT_END
1162 #define SvIV_please_nomg(sv) \
1163 (!SvIOKp(sv) && (SvNOK(sv) || SvPOK(sv)) \
1164 ? (SvIV_nomg(sv), SvIOK(sv)) \
1166 #define SvIV_set(sv, val) \
1168 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1169 assert(!isGV_with_GP(sv)); \
1170 (((XPVIV*) SvANY(sv))->xiv_iv = (val)); } STMT_END
1171 #define SvNV_set(sv, val) \
1173 assert(PL_valid_types_NV_set[SvTYPE(sv) & SVt_MASK]); \
1174 assert(!isGV_with_GP(sv)); \
1175 (((XPVNV*)SvANY(sv))->xnv_u.xnv_nv = (val)); } STMT_END
1176 #define SvPV_set(sv, val) \
1178 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1179 assert(!isGV_with_GP(sv)); \
1180 assert(!(SvTYPE(sv) == SVt_PVIO \
1181 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1182 ((sv)->sv_u.svu_pv = (val)); } STMT_END
1183 #define SvUV_set(sv, val) \
1185 assert(PL_valid_types_IV_set[SvTYPE(sv) & SVt_MASK]); \
1186 assert(!isGV_with_GP(sv)); \
1187 (((XPVUV*)SvANY(sv))->xuv_uv = (val)); } STMT_END
1188 #define SvRV_set(sv, val) \
1190 assert(PL_valid_types_RV[SvTYPE(sv) & SVt_MASK]); \
1191 assert(!isGV_with_GP(sv)); \
1192 assert(!(SvTYPE(sv) == SVt_PVIO \
1193 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1194 ((sv)->sv_u.svu_rv = (val)); } STMT_END
1195 #define SvMAGIC_set(sv, val) \
1196 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1197 (((XPVMG*)SvANY(sv))->xmg_u.xmg_magic = (val)); } STMT_END
1198 #define SvSTASH_set(sv, val) \
1199 STMT_START { assert(SvTYPE(sv) >= SVt_PVMG); \
1200 (((XPVMG*) SvANY(sv))->xmg_stash = (val)); } STMT_END
1201 #define SvCUR_set(sv, val) \
1203 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1204 assert(!isGV_with_GP(sv)); \
1205 assert(!(SvTYPE(sv) == SVt_PVIO \
1206 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1207 (((XPV*) SvANY(sv))->xpv_cur = (val)); } STMT_END
1208 #define SvLEN_set(sv, val) \
1210 assert(PL_valid_types_PVX[SvTYPE(sv) & SVt_MASK]); \
1211 assert(!isGV_with_GP(sv)); \
1212 assert(!(SvTYPE(sv) == SVt_PVIO \
1213 && !(IoFLAGS(sv) & IOf_FAKE_DIRP))); \
1214 (((XPV*) SvANY(sv))->xpv_len = (val)); } STMT_END
1215 #define SvEND_set(sv, val) \
1216 STMT_START { assert(SvTYPE(sv) >= SVt_PV); \
1217 SvCUR_set(sv, (val) - SvPVX(sv)); } STMT_END
1219 #define SvPV_renew(sv,n) \
1220 STMT_START { SvLEN_set(sv, n); \
1221 SvPV_set((sv), (MEM_WRAP_CHECK_(n,char) \
1222 (char*)saferealloc((Malloc_t)SvPVX(sv), \
1223 (MEM_SIZE)((n))))); \
1226 #define SvPV_shrink_to_cur(sv) STMT_START { \
1227 const STRLEN _lEnGtH = SvCUR(sv) + 1; \
1228 SvPV_renew(sv, _lEnGtH); \
1231 #define SvPV_free(sv) \
1233 assert(SvTYPE(sv) >= SVt_PV); \
1235 assert(!SvROK(sv)); \
1238 SvOOK_offset(sv, zok); \
1239 SvPV_set(sv, SvPVX_mutable(sv) - zok); \
1240 SvFLAGS(sv) &= ~SVf_OOK; \
1242 Safefree(SvPVX(sv)); \
1247 /* Code that crops up in three places to take a scalar and ready it to hold
1249 # define prepare_SV_for_RV(sv) \
1251 if (SvTYPE(sv) < SVt_PV && SvTYPE(sv) != SVt_IV) \
1252 sv_upgrade(sv, SVt_IV); \
1253 else if (SvTYPE(sv) >= SVt_PV) { \
1262 # define BmFLAGS(sv) (SvTAIL(sv) ? FBMcf_TAIL : 0)
1265 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1266 # define BmRARE(sv) \
1267 (*({ SV *const _bmrare = MUTABLE_SV(sv); \
1268 assert(SvTYPE(_bmrare) == SVt_PVMG); \
1269 assert(SvVALID(_bmrare)); \
1270 &(((XPVMG*) SvANY(_bmrare))->xnv_u.xbm_s.xbm_rare); \
1272 # define BmUSEFUL(sv) \
1273 (*({ SV *const _bmuseful = MUTABLE_SV(sv); \
1274 assert(SvTYPE(_bmuseful) == SVt_PVMG); \
1275 assert(SvVALID(_bmuseful)); \
1276 assert(!SvIOK(_bmuseful)); \
1277 &(((XPVMG*) SvANY(_bmuseful))->xnv_u.xbm_s.xbm_useful); \
1279 # define BmPREVIOUS(sv) \
1280 (*({ SV *const _bmprevious = MUTABLE_SV(sv); \
1281 assert(SvTYPE(_bmprevious) == SVt_PVMG); \
1282 assert(SvVALID(_bmprevious)); \
1283 &(((XPVMG*) SvANY(_bmprevious))->xiv_u.xivu_uv); \
1286 # define BmRARE(sv) ((XPVMG*) SvANY(sv))->xnv_u.xbm_s.xbm_rare
1287 # define BmUSEFUL(sv) ((XPVMG*) SvANY(sv))->xnv_u.xbm_s.xbm_useful
1288 # define BmPREVIOUS(sv) ((XPVMG*) SvANY(sv))->xiv_u.xivu_uv
1292 #define FmLINES(sv) ((XPVIV*) SvANY(sv))->xiv_iv
1294 #define LvTYPE(sv) ((XPVLV*) SvANY(sv))->xlv_type
1295 #define LvTARG(sv) ((XPVLV*) SvANY(sv))->xlv_targ
1296 #define LvTARGOFF(sv) ((XPVLV*) SvANY(sv))->xlv_targoff
1297 #define LvTARGLEN(sv) ((XPVLV*) SvANY(sv))->xlv_targlen
1298 #define LvFLAGS(sv) ((XPVLV*) SvANY(sv))->xlv_flags
1300 #define IoIFP(sv) (sv)->sv_u.svu_fp
1301 #define IoOFP(sv) ((XPVIO*) SvANY(sv))->xio_ofp
1302 #define IoDIRP(sv) ((XPVIO*) SvANY(sv))->xio_dirp
1303 #define IoANY(sv) ((XPVIO*) SvANY(sv))->xio_any
1304 #define IoLINES(sv) ((XPVIO*) SvANY(sv))->xiv_u.xivu_iv
1305 #define IoPAGE(sv) ((XPVIO*) SvANY(sv))->xio_page
1306 #define IoPAGE_LEN(sv) ((XPVIO*) SvANY(sv))->xio_page_len
1307 #define IoLINES_LEFT(sv)((XPVIO*) SvANY(sv))->xio_lines_left
1308 #define IoTOP_NAME(sv) ((XPVIO*) SvANY(sv))->xio_top_name
1309 #define IoTOP_GV(sv) ((XPVIO*) SvANY(sv))->xio_top_gv
1310 #define IoFMT_NAME(sv) ((XPVIO*) SvANY(sv))->xio_fmt_name
1311 #define IoFMT_GV(sv) ((XPVIO*) SvANY(sv))->xio_fmt_gv
1312 #define IoBOTTOM_NAME(sv)((XPVIO*) SvANY(sv))->xio_bottom_name
1313 #define IoBOTTOM_GV(sv) ((XPVIO*) SvANY(sv))->xio_bottom_gv
1314 #define IoTYPE(sv) ((XPVIO*) SvANY(sv))->xio_type
1315 #define IoFLAGS(sv) ((XPVIO*) SvANY(sv))->xio_flags
1317 /* IoTYPE(sv) is a single character telling the type of I/O connection. */
1318 #define IoTYPE_RDONLY '<'
1319 #define IoTYPE_WRONLY '>'
1320 #define IoTYPE_RDWR '+'
1321 #define IoTYPE_APPEND 'a'
1322 #define IoTYPE_PIPE '|'
1323 #define IoTYPE_STD '-' /* stdin or stdout */
1324 #define IoTYPE_SOCKET 's'
1325 #define IoTYPE_CLOSED ' '
1326 #define IoTYPE_IMPLICIT 'I' /* stdin or stdout or stderr */
1327 #define IoTYPE_NUMERIC '#' /* fdopen */
1330 =for apidoc Am|bool|SvTAINTED|SV* sv
1331 Checks to see if an SV is tainted. Returns TRUE if it is, FALSE if
1334 =for apidoc Am|void|SvTAINTED_on|SV* sv
1335 Marks an SV as tainted if tainting is enabled.
1337 =for apidoc Am|void|SvTAINTED_off|SV* sv
1338 Untaints an SV. Be I<very> careful with this routine, as it short-circuits
1339 some of Perl's fundamental security features. XS module authors should not
1340 use this function unless they fully understand all the implications of
1341 unconditionally untainting the value. Untainting should be done in the
1342 standard perl fashion, via a carefully crafted regexp, rather than directly
1343 untainting variables.
1345 =for apidoc Am|void|SvTAINT|SV* sv
1346 Taints an SV if tainting is enabled, and if some input to the current
1347 expression is tainted--usually a variable, but possibly also implicit
1348 inputs such as locale settings. C<SvTAINT> propagates that taintedness to
1349 the outputs of an expression in a pessimistic fashion; i.e., without paying
1350 attention to precisely which outputs are influenced by which inputs.
1355 #define sv_taint(sv) sv_magic((sv), NULL, PERL_MAGIC_taint, NULL, 0)
1357 #define SvTAINTED(sv) (SvMAGICAL(sv) && sv_tainted(sv))
1358 #define SvTAINTED_on(sv) STMT_START{ if(PL_tainting){sv_taint(sv);} }STMT_END
1359 #define SvTAINTED_off(sv) STMT_START{ if(PL_tainting){sv_untaint(sv);} }STMT_END
1361 #define SvTAINT(sv) \
1363 if (PL_tainting) { \
1370 =for apidoc Am|char*|SvPV_force|SV* sv|STRLEN len
1371 Like C<SvPV> but will force the SV into containing a string (C<SvPOK>), and
1372 only a string (C<SvPOK_only>), by hook or by crook. You want force if you are
1373 going to update the C<SvPVX> directly. Processes get magic.
1375 =for apidoc Am|char*|SvPV_force_nomg|SV* sv|STRLEN len
1376 Like C<SvPV> but will force the SV into containing a string (C<SvPOK>), and
1377 only a string (C<SvPOK_only>), by hook or by crook. You want force if you are
1378 going to update the C<SvPVX> directly. Doesn't process get magic.
1380 =for apidoc Am|char*|SvPV|SV* sv|STRLEN len
1381 Returns a pointer to the string in the SV, or a stringified form of
1382 the SV if the SV does not contain a string. The SV may cache the
1383 stringified version becoming C<SvPOK>. Handles 'get' magic. See also
1384 C<SvPVx> for a version which guarantees to evaluate sv only once.
1386 =for apidoc Am|char*|SvPVx|SV* sv|STRLEN len
1387 A version of C<SvPV> which guarantees to evaluate C<sv> only once.
1388 Only use this if C<sv> is an expression with side effects, otherwise use the
1389 more efficient C<SvPV>.
1391 =for apidoc Am|char*|SvPV_nomg|SV* sv|STRLEN len
1392 Like C<SvPV> but doesn't process magic.
1394 =for apidoc Am|char*|SvPV_nolen|SV* sv
1395 Returns a pointer to the string in the SV, or a stringified form of
1396 the SV if the SV does not contain a string. The SV may cache the
1397 stringified form becoming C<SvPOK>. Handles 'get' magic.
1399 =for apidoc Am|char*|SvPV_nomg_nolen|SV* sv
1400 Like C<SvPV_nolen> but doesn't process magic.
1402 =for apidoc Am|IV|SvIV|SV* sv
1403 Coerces the given SV to an integer and returns it. See C<SvIVx> for a
1404 version which guarantees to evaluate sv only once.
1406 =for apidoc Am|IV|SvIV_nomg|SV* sv
1407 Like C<SvIV> but doesn't process magic.
1409 =for apidoc Am|IV|SvIVx|SV* sv
1410 Coerces the given SV to an integer and returns it.
1411 Guarantees to evaluate C<sv> only once. Only use
1412 this if C<sv> is an expression with side effects,
1413 otherwise use the more efficient C<SvIV>.
1415 =for apidoc Am|NV|SvNV|SV* sv
1416 Coerce the given SV to a double and return it. See C<SvNVx> for a version
1417 which guarantees to evaluate sv only once.
1419 =for apidoc Am|NV|SvNV_nomg|SV* sv
1420 Like C<SvNV> but doesn't process magic.
1422 =for apidoc Am|NV|SvNVx|SV* sv
1423 Coerces the given SV to a double and returns it.
1424 Guarantees to evaluate C<sv> only once. Only use
1425 this if C<sv> is an expression with side effects,
1426 otherwise use the more efficient C<SvNV>.
1428 =for apidoc Am|UV|SvUV|SV* sv
1429 Coerces the given SV to an unsigned integer and returns it. See C<SvUVx>
1430 for a version which guarantees to evaluate sv only once.
1432 =for apidoc Am|UV|SvUV_nomg|SV* sv
1433 Like C<SvUV> but doesn't process magic.
1435 =for apidoc Am|UV|SvUVx|SV* sv
1436 Coerces the given SV to an unsigned integer and
1437 returns it. Guarantees to C<sv> only once. Only
1438 use this if C<sv> is an expression with side effects,
1439 otherwise use the more efficient C<SvUV>.
1441 =for apidoc Am|bool|SvTRUE|SV* sv
1442 Returns a boolean indicating whether Perl would evaluate the SV as true or
1443 false. See SvOK() for a defined/undefined test. Handles 'get' magic
1444 unless the scalar is already SvPOK, SvIOK or SvNOK (the public, not the
1447 =for apidoc Am|bool|SvTRUE_nomg|SV* sv
1448 Returns a boolean indicating whether Perl would evaluate the SV as true or
1449 false. See SvOK() for a defined/undefined test. Does not handle 'get' magic.
1451 =for apidoc Am|char*|SvPVutf8_force|SV* sv|STRLEN len
1452 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1454 =for apidoc Am|char*|SvPVutf8|SV* sv|STRLEN len
1455 Like C<SvPV>, but converts sv to utf8 first if necessary.
1457 =for apidoc Am|char*|SvPVutf8_nolen|SV* sv
1458 Like C<SvPV_nolen>, but converts sv to utf8 first if necessary.
1460 =for apidoc Am|char*|SvPVbyte_force|SV* sv|STRLEN len
1461 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1463 =for apidoc Am|char*|SvPVbyte|SV* sv|STRLEN len
1464 Like C<SvPV>, but converts sv to byte representation first if necessary.
1466 =for apidoc Am|char*|SvPVbyte_nolen|SV* sv
1467 Like C<SvPV_nolen>, but converts sv to byte representation first if necessary.
1469 =for apidoc Am|char*|SvPVutf8x_force|SV* sv|STRLEN len
1470 Like C<SvPV_force>, but converts sv to utf8 first if necessary.
1471 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8_force>
1474 =for apidoc Am|char*|SvPVutf8x|SV* sv|STRLEN len
1475 Like C<SvPV>, but converts sv to utf8 first if necessary.
1476 Guarantees to evaluate sv only once; use the more efficient C<SvPVutf8>
1479 =for apidoc Am|char*|SvPVbytex_force|SV* sv|STRLEN len
1480 Like C<SvPV_force>, but converts sv to byte representation first if necessary.
1481 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte_force>
1484 =for apidoc Am|char*|SvPVbytex|SV* sv|STRLEN len
1485 Like C<SvPV>, but converts sv to byte representation first if necessary.
1486 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte>
1489 =for apidoc Am|bool|SvIsCOW|SV* sv
1490 Returns a boolean indicating whether the SV is Copy-On-Write (either shared
1491 hash key scalars, or full Copy On Write scalars if 5.9.0 is configured for
1494 =for apidoc Am|bool|SvIsCOW_shared_hash|SV* sv
1495 Returns a boolean indicating whether the SV is Copy-On-Write shared hash key
1498 =for apidoc Am|void|sv_catpvn_nomg|SV* sv|const char* ptr|STRLEN len
1499 Like C<sv_catpvn> but doesn't process magic.
1501 =for apidoc Am|void|sv_catpv_nomg|SV* sv|const char* ptr
1502 Like C<sv_catpv> but doesn't process magic.
1504 =for apidoc Am|void|sv_setsv_nomg|SV* dsv|SV* ssv
1505 Like C<sv_setsv> but doesn't process magic.
1507 =for apidoc Am|void|sv_catsv_nomg|SV* dsv|SV* ssv
1508 Like C<sv_catsv> but doesn't process magic.
1510 =for apidoc Amdb|STRLEN|sv_utf8_upgrade_nomg|NN SV *sv
1512 Like sv_utf8_upgrade, but doesn't do magic on C<sv>.
1517 /* Let us hope that bitmaps for UV and IV are the same */
1518 #define SvIV(sv) (SvIOK_nog(sv) ? SvIVX(sv) : sv_2iv(sv))
1519 #define SvUV(sv) (SvUOK_nog(sv) ? SvUVX(sv) : sv_2uv(sv))
1520 #define SvNV(sv) (SvNOK_nog(sv) ? SvNVX(sv) : sv_2nv(sv))
1522 #define SvIV_nomg(sv) (SvIOK(sv) ? SvIVX(sv) : sv_2iv_flags(sv, 0))
1523 #define SvUV_nomg(sv) (SvIOK(sv) ? SvUVX(sv) : sv_2uv_flags(sv, 0))
1524 #define SvNV_nomg(sv) (SvNOK(sv) ? SvNVX(sv) : sv_2nv_flags(sv, 0))
1528 #define SvPV(sv, lp) SvPV_flags(sv, lp, SV_GMAGIC)
1529 #define SvPV_const(sv, lp) SvPV_flags_const(sv, lp, SV_GMAGIC)
1530 #define SvPV_mutable(sv, lp) SvPV_flags_mutable(sv, lp, SV_GMAGIC)
1532 #define SvPV_flags(sv, lp, flags) \
1534 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pv_flags(sv, &lp, flags))
1535 #define SvPV_flags_const(sv, lp, flags) \
1537 ? ((lp = SvCUR(sv)), SvPVX_const(sv)) : \
1538 (const char*) sv_2pv_flags(sv, &lp, flags|SV_CONST_RETURN))
1539 #define SvPV_flags_const_nolen(sv, flags) \
1541 ? SvPVX_const(sv) : \
1542 (const char*) sv_2pv_flags(sv, 0, flags|SV_CONST_RETURN))
1543 #define SvPV_flags_mutable(sv, lp, flags) \
1545 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) : \
1546 sv_2pv_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1548 #define SvPV_force(sv, lp) SvPV_force_flags(sv, lp, SV_GMAGIC)
1549 #define SvPV_force_nolen(sv) SvPV_force_flags_nolen(sv, SV_GMAGIC)
1550 #define SvPV_force_mutable(sv, lp) SvPV_force_flags_mutable(sv, lp, SV_GMAGIC)
1552 #define SvPV_force_nomg(sv, lp) SvPV_force_flags(sv, lp, 0)
1553 #define SvPV_force_nomg_nolen(sv) SvPV_force_flags_nolen(sv, 0)
1555 #define SvPV_force_flags(sv, lp, flags) \
1556 (SvPOK_pure_nogthink(sv) \
1557 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvn_force_flags(sv, &lp, flags))
1559 #define SvPV_force_flags_nolen(sv, flags) \
1560 (SvPOK_pure_nogthink(sv) \
1561 ? SvPVX(sv) : sv_pvn_force_flags(sv, 0, flags))
1563 #define SvPV_force_flags_mutable(sv, lp, flags) \
1564 (SvPOK_pure_nogthink(sv) \
1565 ? ((lp = SvCUR(sv)), SvPVX_mutable(sv)) \
1566 : sv_pvn_force_flags(sv, &lp, flags|SV_MUTABLE_RETURN))
1568 #define SvPV_nolen(sv) \
1570 ? SvPVX(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC))
1572 #define SvPV_nomg_nolen(sv) \
1574 ? SvPVX(sv) : sv_2pv_flags(sv, 0, 0))
1576 #define SvPV_nolen_const(sv) \
1578 ? SvPVX_const(sv) : sv_2pv_flags(sv, 0, SV_GMAGIC|SV_CONST_RETURN))
1580 #define SvPV_nomg(sv, lp) SvPV_flags(sv, lp, 0)
1581 #define SvPV_nomg_const(sv, lp) SvPV_flags_const(sv, lp, 0)
1582 #define SvPV_nomg_const_nolen(sv) SvPV_flags_const_nolen(sv, 0)
1586 #define SvPVutf8(sv, lp) \
1587 (SvPOK_utf8_nog(sv) \
1588 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvutf8(sv, &lp))
1590 #define SvPVutf8_force(sv, lp) \
1591 (SvPOK_utf8_pure_nogthink(sv) \
1592 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvutf8n_force(sv, &lp))
1594 #define SvPVutf8_nolen(sv) \
1595 (SvPOK_utf8_nog(sv) \
1596 ? SvPVX(sv) : sv_2pvutf8(sv, 0))
1600 #define SvPVbyte(sv, lp) \
1601 (SvPOK_byte_nog(sv) \
1602 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_2pvbyte(sv, &lp))
1604 #define SvPVbyte_force(sv, lp) \
1605 (SvPOK_byte_pure_nogthink(sv) \
1606 ? ((lp = SvCUR(sv)), SvPVX(sv)) : sv_pvbyten_force(sv, &lp))
1608 #define SvPVbyte_nolen(sv) \
1609 (SvPOK_byte_nog(sv) \
1610 ? SvPVX(sv) : sv_2pvbyte(sv, 0))
1613 /* define FOOx(): idempotent versions of FOO(). If possible, use a local
1614 * var to evaluate the arg once; failing that, use a global if possible;
1615 * failing that, call a function to do the work
1618 #define SvPVx_force(sv, lp) sv_pvn_force(sv, &lp)
1619 #define SvPVutf8x_force(sv, lp) sv_pvutf8n_force(sv, &lp)
1620 #define SvPVbytex_force(sv, lp) sv_pvbyten_force(sv, &lp)
1622 #define SvTRUE(sv) ((sv) && (SvGMAGICAL(sv) ? sv_2bool(sv) : SvTRUE_common(sv, sv_2bool_nomg(sv))))
1623 #define SvTRUE_nomg(sv) ((sv) && ( SvTRUE_common(sv, sv_2bool_nomg(sv))))
1624 #define SvTRUE_common(sv,fallback) ( \
1627 : (SvFLAGS(sv) & (SVf_POK|SVf_IOK|SVf_NOK)) \
1628 ? ( (SvPOK(sv) && SvPVXtrue(sv)) \
1629 || (SvIOK(sv) && SvIVX(sv) != 0) \
1630 || (SvNOK(sv) && SvNVX(sv) != 0.0)) \
1633 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
1635 # define SvIVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvIV(_sv); })
1636 # define SvUVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvUV(_sv); })
1637 # define SvNVx(sv) ({SV *_sv = MUTABLE_SV(sv); SvNV(_sv); })
1638 # define SvPVx(sv, lp) ({SV *_sv = (sv); SvPV(_sv, lp); })
1639 # define SvPVx_const(sv, lp) ({SV *_sv = (sv); SvPV_const(_sv, lp); })
1640 # define SvPVx_nolen(sv) ({SV *_sv = (sv); SvPV_nolen(_sv); })
1641 # define SvPVx_nolen_const(sv) ({SV *_sv = (sv); SvPV_nolen_const(_sv); })
1642 # define SvPVutf8x(sv, lp) ({SV *_sv = (sv); SvPVutf8(_sv, lp); })
1643 # define SvPVbytex(sv, lp) ({SV *_sv = (sv); SvPVbyte(_sv, lp); })
1644 # define SvPVbytex_nolen(sv) ({SV *_sv = (sv); SvPVbyte_nolen(_sv); })
1645 # define SvTRUEx(sv) ({SV *_sv = (sv); SvTRUE(_sv); })
1646 # define SvTRUEx_nomg(sv) ({SV *_sv = (sv); SvTRUE_nomg(_sv); })
1647 # define SvPVXtrue(sv) \
1649 (nxpv = (XPV*)SvANY(sv)) \
1650 && (nxpv->xpv_cur > 1 \
1651 || (nxpv->xpv_cur && *(sv)->sv_u.svu_pv != '0'));})
1653 #else /* __GNUC__ */
1655 /* These inlined macros use globals, which will require a thread
1656 * declaration in user code, so we avoid them under threads */
1658 # define SvIVx(sv) ((PL_Sv = (sv)), SvIV(PL_Sv))
1659 # define SvUVx(sv) ((PL_Sv = (sv)), SvUV(PL_Sv))
1660 # define SvNVx(sv) ((PL_Sv = (sv)), SvNV(PL_Sv))
1661 # define SvPVx(sv, lp) ((PL_Sv = (sv)), SvPV(PL_Sv, lp))
1662 # define SvPVx_const(sv, lp) ((PL_Sv = (sv)), SvPV_const(PL_Sv, lp))
1663 # define SvPVx_nolen(sv) ((PL_Sv = (sv)), SvPV_nolen(PL_Sv))
1664 # define SvPVx_nolen_const(sv) ((PL_Sv = (sv)), SvPV_nolen_const(PL_Sv))
1665 # define SvPVutf8x(sv, lp) ((PL_Sv = (sv)), SvPVutf8(PL_Sv, lp))
1666 # define SvPVbytex(sv, lp) ((PL_Sv = (sv)), SvPVbyte(PL_Sv, lp))
1667 # define SvPVbytex_nolen(sv) ((PL_Sv = (sv)), SvPVbyte_nolen(PL_Sv))
1668 # define SvTRUEx(sv) ((PL_Sv = (sv)), SvTRUE(PL_Sv))
1669 # define SvTRUEx_nomg(sv) ((PL_Sv = (sv)), SvTRUE_nomg(PL_Sv))
1670 # define SvPVXtrue(sv) \
1671 ((PL_Xpv = (XPV*)SvANY(PL_Sv = (sv))) \
1672 && (PL_Xpv->xpv_cur > 1 \
1673 || (PL_Xpv->xpv_cur && *PL_Sv->sv_u.svu_pv != '0')))
1674 #endif /* __GNU__ */
1676 #define SvIsCOW(sv) ((SvFLAGS(sv) & (SVf_FAKE | SVf_READONLY)) == \
1677 (SVf_FAKE | SVf_READONLY) && !isGV_with_GP(sv) \
1678 && SvTYPE(sv) != SVt_REGEXP)
1679 #define SvIsCOW_shared_hash(sv) (SvIsCOW(sv) && SvLEN(sv) == 0)
1681 #define SvSHARED_HEK_FROM_PV(pvx) \
1682 ((struct hek*)(pvx - STRUCT_OFFSET(struct hek, hek_key)))
1683 #define SvSHARED_HASH(sv) (0 + SvSHARED_HEK_FROM_PV(SvPVX_const(sv))->hek_hash)
1685 /* flag values for sv_*_flags functions */
1686 #define SV_IMMEDIATE_UNREF 1
1688 #define SV_COW_DROP_PV 4
1689 #define SV_UTF8_NO_ENCODING 8
1690 #define SV_NOSTEAL 16
1691 #define SV_CONST_RETURN 32
1692 #define SV_MUTABLE_RETURN 64
1693 #define SV_SMAGIC 128
1694 #define SV_HAS_TRAILING_NUL 256
1695 #define SV_COW_SHARED_HASH_KEYS 512
1696 /* This one is only enabled for PERL_OLD_COPY_ON_WRITE */
1697 #define SV_COW_OTHER_PVS 1024
1698 /* Make sv_2pv_flags return NULL if something is undefined. */
1699 #define SV_UNDEF_RETURNS_NULL 2048
1700 /* Tell sv_utf8_upgrade() to not check to see if an upgrade is really needed.
1701 * This is used when the caller has already determined it is, and avoids
1703 #define SV_FORCE_UTF8_UPGRADE 4096
1704 /* if (after resolving magic etc), the SV is found to be overloaded,
1705 * don't call the overload magic, just return as-is */
1706 #define SV_SKIP_OVERLOAD 8192
1707 /* It is not yet clear whether we want this as an API, or what the
1708 * constants should be named. */
1710 # define SV_CATBYTES 16384
1711 # define SV_CATUTF8 32768
1714 /* The core is safe for this COW optimisation. XS code on CPAN may not be.
1715 So only default to doing the COW setup if we're in the core.
1718 # ifndef SV_DO_COW_SVSETSV
1719 # define SV_DO_COW_SVSETSV SV_COW_SHARED_HASH_KEYS|SV_COW_OTHER_PVS
1723 #ifndef SV_DO_COW_SVSETSV
1724 # define SV_DO_COW_SVSETSV 0
1728 #define sv_unref(sv) sv_unref_flags(sv, 0)
1729 #define sv_force_normal(sv) sv_force_normal_flags(sv, 0)
1730 #define sv_usepvn(sv, p, l) sv_usepvn_flags(sv, p, l, 0)
1731 #define sv_usepvn_mg(sv, p, l) sv_usepvn_flags(sv, p, l, SV_SMAGIC)
1733 /* We are about to replace the SV's current value. So if it's copy on write
1734 we need to normalise it. Use the SV_COW_DROP_PV flag hint to say that
1735 the value is about to get thrown away, so drop the PV rather than go to
1736 the effort of making a read-write copy only for it to get immediately
1739 #define SV_CHECK_THINKFIRST_COW_DROP(sv) if (SvTHINKFIRST(sv)) \
1740 sv_force_normal_flags(sv, SV_COW_DROP_PV)
1742 #ifdef PERL_OLD_COPY_ON_WRITE
1743 #define SvRELEASE_IVX(sv) \
1744 ((SvIsCOW(sv) ? sv_force_normal_flags(sv, 0) : (void) 0), 0)
1745 # define SvIsCOW_normal(sv) (SvIsCOW(sv) && SvLEN(sv))
1746 # define SvRELEASE_IVX_(sv) SvRELEASE_IVX(sv),
1748 # define SvRELEASE_IVX(sv) 0
1749 /* This little game brought to you by the need to shut this warning up:
1750 mg.c: In function 'Perl_magic_get':
1751 mg.c:1024: warning: left-hand operand of comma expression has no effect
1753 # define SvRELEASE_IVX_(sv) /**/
1754 #endif /* PERL_OLD_COPY_ON_WRITE */
1756 #define CAN_COW_MASK (SVs_OBJECT|SVs_GMG|SVs_SMG|SVs_RMG|SVf_IOK|SVf_NOK| \
1757 SVf_POK|SVf_ROK|SVp_IOK|SVp_NOK|SVp_POK|SVf_FAKE| \
1758 SVf_OOK|SVf_BREAK|SVf_READONLY)
1759 #define CAN_COW_FLAGS (SVp_POK|SVf_POK)
1761 #define SV_CHECK_THINKFIRST(sv) if (SvTHINKFIRST(sv)) \
1762 sv_force_normal_flags(sv, 0)
1765 /* all these 'functions' are now just macros */
1767 #define sv_pv(sv) SvPV_nolen(sv)
1768 #define sv_pvutf8(sv) SvPVutf8_nolen(sv)
1769 #define sv_pvbyte(sv) SvPVbyte_nolen(sv)
1771 #define sv_pvn_force_nomg(sv, lp) sv_pvn_force_flags(sv, lp, 0)
1772 #define sv_utf8_upgrade_flags(sv, flags) sv_utf8_upgrade_flags_grow(sv, flags, 0)
1773 #define sv_utf8_upgrade_nomg(sv) sv_utf8_upgrade_flags(sv, 0)
1774 #define sv_catpvn_nomg(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, 0)
1775 #define sv_catpv_nomg(dsv, sstr) sv_catpv_flags(dsv, sstr, 0)
1776 #define sv_setsv(dsv, ssv) \
1777 sv_setsv_flags(dsv, ssv, SV_GMAGIC|SV_DO_COW_SVSETSV)
1778 #define sv_setsv_nomg(dsv, ssv) sv_setsv_flags(dsv, ssv, SV_DO_COW_SVSETSV)
1779 #define sv_catsv(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC)
1780 #define sv_catsv_nomg(dsv, ssv) sv_catsv_flags(dsv, ssv, 0)
1781 #define sv_catsv_mg(dsv, ssv) sv_catsv_flags(dsv, ssv, SV_GMAGIC|SV_SMAGIC)
1782 #define sv_catpvn(dsv, sstr, slen) sv_catpvn_flags(dsv, sstr, slen, SV_GMAGIC)
1783 #define sv_catpvn_mg(sv, sstr, slen) sv_catpvn_flags(sv, sstr, slen, SV_GMAGIC|SV_SMAGIC);
1784 #define sv_copypv(dsv, ssv) sv_copypv_flags(dsv, ssv, SV_GMAGIC)
1785 #define sv_copypv_nomg(dsv, ssv) sv_copypv_flags(dsv, ssv, 0)
1786 #define sv_2pv(sv, lp) sv_2pv_flags(sv, lp, SV_GMAGIC)
1787 #define sv_2pv_nolen(sv) sv_2pv(sv, 0)
1788 #define sv_2pvbyte_nolen(sv) sv_2pvbyte(sv, 0)
1789 #define sv_2pvutf8_nolen(sv) sv_2pvutf8(sv, 0)
1790 #define sv_2pv_nomg(sv, lp) sv_2pv_flags(sv, lp, 0)
1791 #define sv_pvn_force(sv, lp) sv_pvn_force_flags(sv, lp, SV_GMAGIC)
1792 #define sv_utf8_upgrade(sv) sv_utf8_upgrade_flags(sv, SV_GMAGIC)
1793 #define sv_2iv(sv) sv_2iv_flags(sv, SV_GMAGIC)
1794 #define sv_2uv(sv) sv_2uv_flags(sv, SV_GMAGIC)
1795 #define sv_2nv(sv) sv_2nv_flags(sv, SV_GMAGIC)
1796 #define sv_eq(sv1, sv2) sv_eq_flags(sv1, sv2, SV_GMAGIC)
1797 #define sv_cmp(sv1, sv2) sv_cmp_flags(sv1, sv2, SV_GMAGIC)
1798 #define sv_cmp_locale(sv1, sv2) sv_cmp_locale_flags(sv1, sv2, SV_GMAGIC)
1799 #define sv_collxfrm(sv, nxp) sv_cmp_flags(sv, nxp, SV_GMAGIC)
1800 #define sv_2bool(sv) sv_2bool_flags(sv, SV_GMAGIC)
1801 #define sv_2bool_nomg(sv) sv_2bool_flags(sv, 0)
1802 #define sv_insert(bigstr, offset, len, little, littlelen) \
1803 Perl_sv_insert_flags(aTHX_ (bigstr),(offset), (len), (little), \
1804 (littlelen), SV_GMAGIC)
1806 /* Should be named SvCatPVN_utf8_upgrade? */
1807 #define sv_catpvn_nomg_utf8_upgrade(dsv, sstr, slen, nsv) \
1810 nsv = newSVpvn_flags(sstr, slen, SVs_TEMP); \
1812 sv_setpvn(nsv, sstr, slen); \
1814 sv_utf8_upgrade(nsv); \
1815 sv_catsv_nomg(dsv, nsv); \
1819 =for apidoc Am|SV*|newRV_inc|SV* sv
1821 Creates an RV wrapper for an SV. The reference count for the original SV is
1827 #define newRV_inc(sv) newRV(sv)
1829 /* the following macros update any magic values this sv is associated with */
1832 =head1 Magical Functions
1834 =for apidoc Am|void|SvGETMAGIC|SV* sv
1835 Invokes C<mg_get> on an SV if it has 'get' magic. For example, this
1836 will call C<FETCH> on a tied variable. This macro evaluates its
1837 argument more than once.
1839 =for apidoc Am|void|SvSETMAGIC|SV* sv
1840 Invokes C<mg_set> on an SV if it has 'set' magic. This is necessary
1841 after modifying a scalar, in case it is a magical variable like C<$|>
1842 or a tied variable (it calls C<STORE>). This macro evaluates its
1843 argument more than once.
1845 =for apidoc Am|void|SvSetSV|SV* dsb|SV* ssv
1846 Calls C<sv_setsv> if dsv is not the same as ssv. May evaluate arguments
1849 =for apidoc Am|void|SvSetSV_nosteal|SV* dsv|SV* ssv
1850 Calls a non-destructive version of C<sv_setsv> if dsv is not the same as
1851 ssv. May evaluate arguments more than once.
1853 =for apidoc Am|void|SvSetMagicSV|SV* dsb|SV* ssv
1854 Like C<SvSetSV>, but does any set magic required afterwards.
1856 =for apidoc Am|void|SvSetMagicSV_nosteal|SV* dsv|SV* ssv
1857 Like C<SvSetSV_nosteal>, but does any set magic required afterwards.
1859 =for apidoc Am|void|SvSHARE|SV* sv
1860 Arranges for sv to be shared between threads if a suitable module
1863 =for apidoc Am|void|SvLOCK|SV* sv
1864 Arranges for a mutual exclusion lock to be obtained on sv if a suitable module
1867 =for apidoc Am|void|SvUNLOCK|SV* sv
1868 Releases a mutual exclusion lock on sv if a suitable module
1871 =head1 SV Manipulation Functions
1873 =for apidoc Am|char *|SvGROW|SV* sv|STRLEN len
1874 Expands the character buffer in the SV so that it has room for the
1875 indicated number of bytes (remember to reserve space for an extra trailing
1876 NUL character). Calls C<sv_grow> to perform the expansion if necessary.
1877 Returns a pointer to the character buffer.
1882 #define SvSHARE(sv) PL_sharehook(aTHX_ sv)
1883 #define SvLOCK(sv) PL_lockhook(aTHX_ sv)
1884 #define SvUNLOCK(sv) PL_unlockhook(aTHX_ sv)
1885 #define SvDESTROYABLE(sv) PL_destroyhook(aTHX_ sv)
1887 #define SvGETMAGIC(x) ((void)(SvGMAGICAL(x) && mg_get(x)))
1888 #define SvSETMAGIC(x) STMT_START { if (SvSMAGICAL(x)) mg_set(x); } STMT_END
1890 #define SvSetSV_and(dst,src,finally) \
1892 if ((dst) != (src)) { \
1893 sv_setsv(dst, src); \
1897 #define SvSetSV_nosteal_and(dst,src,finally) \
1899 if ((dst) != (src)) { \
1900 sv_setsv_flags(dst, src, SV_GMAGIC | SV_NOSTEAL | SV_DO_COW_SVSETSV); \
1905 #define SvSetSV(dst,src) \
1906 SvSetSV_and(dst,src,/*nothing*/;)
1907 #define SvSetSV_nosteal(dst,src) \
1908 SvSetSV_nosteal_and(dst,src,/*nothing*/;)
1910 #define SvSetMagicSV(dst,src) \
1911 SvSetSV_and(dst,src,SvSETMAGIC(dst))
1912 #define SvSetMagicSV_nosteal(dst,src) \
1913 SvSetSV_nosteal_and(dst,src,SvSETMAGIC(dst))
1916 #if !defined(SKIP_DEBUGGING)
1917 #define SvPEEK(sv) sv_peek(sv)
1919 #define SvPEEK(sv) ""
1922 #define SvIMMORTAL(sv) ((sv)==&PL_sv_undef || (sv)==&PL_sv_yes || (sv)==&PL_sv_no || (sv)==&PL_sv_placeholder)
1925 =for apidoc Am|SV *|boolSV|bool b
1927 Returns a true SV if C<b> is a true value, or a false SV if C<b> is 0.
1929 See also C<PL_sv_yes> and C<PL_sv_no>.
1934 #define boolSV(b) ((b) ? &PL_sv_yes : &PL_sv_no)
1936 #define isGV(sv) (SvTYPE(sv) == SVt_PVGV)
1937 /* If I give every macro argument a different name, then there won't be bugs
1938 where nested macros get confused. Been there, done that. */
1939 #define isGV_with_GP(pwadak) \
1940 (((SvFLAGS(pwadak) & (SVp_POK|SVpgv_GP)) == SVpgv_GP) \
1941 && (SvTYPE(pwadak) == SVt_PVGV || SvTYPE(pwadak) == SVt_PVLV))
1942 #define isGV_with_GP_on(sv) STMT_START { \
1943 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
1944 assert (!SvPOKp(sv)); \
1945 assert (!SvIOKp(sv)); \
1946 (SvFLAGS(sv) |= SVpgv_GP); \
1948 #define isGV_with_GP_off(sv) STMT_START { \
1949 assert (SvTYPE(sv) == SVt_PVGV || SvTYPE(sv) == SVt_PVLV); \
1950 assert (!SvPOKp(sv)); \
1951 assert (!SvIOKp(sv)); \
1952 (SvFLAGS(sv) &= ~SVpgv_GP); \
1956 #define SvGROW(sv,len) (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX(sv))
1957 #define SvGROW_mutable(sv,len) \
1958 (SvLEN(sv) < (len) ? sv_grow(sv,len) : SvPVX_mutable(sv))
1959 #define Sv_Grow sv_grow
1961 #define CLONEf_COPY_STACKS 1
1962 #define CLONEf_KEEP_PTR_TABLE 2
1963 #define CLONEf_CLONE_HOST 4
1964 #define CLONEf_JOIN_IN 8
1966 struct clone_params {
1969 PerlInterpreter *proto_perl;
1970 PerlInterpreter *new_perl;
1975 =for apidoc Am|SV*|newSVpvn_utf8|NULLOK const char* s|STRLEN len|U32 utf8
1977 Creates a new SV and copies a string into it. If utf8 is true, calls
1978 C<SvUTF8_on> on the new SV. Implemented as a wrapper around C<newSVpvn_flags>.
1983 #define newSVpvn_utf8(s, len, u) newSVpvn_flags((s), (len), (u) ? SVf_UTF8 : 0)
1986 =for apidoc Amx|SV*|newSVpadname|PADNAME *pn
1988 Creates a new SV containing the pad name. This is currently identical
1989 to C<newSVsv>, but pad names may cease being SVs at some point, so
1990 C<newSVpadname> is preferable.
1995 #define newSVpadname(pn) newSVsv(pn)
1998 =for apidoc Am|void|SvOOK_offset|NN SV*sv|STRLEN len
2000 Reads into I<len> the offset from SvPVX back to the true start of the
2001 allocated buffer, which will be non-zero if C<sv_chop> has been used to
2002 efficiently remove characters from start of the buffer. Implemented as a
2003 macro, which takes the address of I<len>, which must be of type C<STRLEN>.
2004 Evaluates I<sv> more than once. Sets I<len> to 0 if C<SvOOK(sv)> is false.
2010 /* Does the bot know something I don't?
2011 10:28 <@Nicholas> metabatman
2012 10:28 <+meta> Nicholas: crash
2014 # define SvOOK_offset(sv, offset) STMT_START { \
2015 assert(sizeof(offset) == sizeof(STRLEN)); \
2017 const U8 *_crash = (U8*)SvPVX_const(sv); \
2018 (offset) = *--_crash; \
2020 _crash -= sizeof(STRLEN); \
2021 Copy(_crash, (U8 *)&(offset), sizeof(STRLEN), U8); \
2024 /* Validate the preceding buffer's sentinels to \
2025 verify that no-one is using it. */ \
2026 const U8 *const _bonk = (U8*)SvPVX_const(sv) - (offset);\
2027 while (_crash > _bonk) { \
2029 assert (*_crash == (U8)PTR2UV(_crash)); \
2037 /* This is the same code, but avoids using any temporary variables: */
2038 # define SvOOK_offset(sv, offset) STMT_START { \
2039 assert(sizeof(offset) == sizeof(STRLEN)); \
2041 (offset) = ((U8*)SvPVX_const(sv))[-1]; \
2043 Copy(SvPVX_const(sv) - 1 - sizeof(STRLEN), \
2044 (U8*)&(offset), sizeof(STRLEN), U8); \
2052 #define newIO() MUTABLE_IO(newSV_type(SVt_PVIO))
2056 * c-indentation-style: bsd
2058 * indent-tabs-mode: nil
2061 * ex: set ts=8 sts=4 sw=4 et: