=head1 SV Manipulation Functions
=for apidoc Am|U32|SvREFCNT|SV* sv
-Returns the value of the object's reference count.
+Returns the value of the object's reference count. Exposed
+to perl code via Internals::SvREFCNT().
=for apidoc Am|SV*|SvREFCNT_inc|SV* sv
Increments the reference count of the given SV, returning the SV.
#define SVp_IOK 0x00001000 /* has valid non-public integer value */
#define SVp_NOK 0x00002000 /* has valid non-public numeric value */
#define SVp_POK 0x00004000 /* has valid non-public pointer value */
-#define SVp_SCREAM 0x00008000 /* method name is DOES */
- /* eval cx text is ref counted */
+#define SVp_SCREAM 0x00008000 /* currently unused on plain scalars */
#define SVphv_CLONEABLE SVp_SCREAM /* PVHV (stashes) clone its objects */
#define SVpgv_GP SVp_SCREAM /* GV has a valid GP */
#define SVprv_PCS_IMPORTED SVp_SCREAM /* RV is a proxy for a constant
SVf_POK, SVp_POK also set:
0x00004400 Normal
- 0x0000C400 method name for DOES (SvSCREAM)
0x40004400 FBM compiled (SvVALID)
0x4000C400 *** Formerly used for pad names ***
/* This is only set true on a PVGV when it's playing "PVBM", but is tested for
on any regular scalar (anything <= PVLV) */
#define SVpbm_VALID 0x40000000
-/* Only used in toke.c on an SV stored in PL_lex_repl */
-#define SVrepl_EVAL 0x40000000 /* Replacement part of s///e */
/* IV, PVIV, PVNV, PVMG, PVGV and (I assume) PVLV */
#define SVf_IVisUV 0x80000000 /* use XPVUV instead of XPVIV */
/* PVHV */
#define SVphv_HASKFLAGS 0x80000000 /* keys have flag byte after hash */
/* PVGV when SVpbm_VALID is true */
-#define SVpbm_TAIL 0x80000000
+#define SVpbm_TAIL 0x80000000 /* string has a fake "\n" appended */
/* RV upwards. However, SVf_ROK and SVp_IOK are exclusive */
#define SVprv_WEAKREF 0x80000000 /* Weak reference */
/* pad name vars only */
union _xnvu {
NV xnv_nv; /* numeric value, if any */
HV * xgv_stash;
- struct {
- U32 xlow;
- U32 xhigh;
- } xpad_cop_seq; /* used by pad.c for cop_sequence */
+ line_t xnv_lines; /* used internally by S_scan_subst() */
};
union _xivu {
IV xivu_iv; /* integer value */
UV xivu_uv;
HEK * xivu_namehek; /* xpvlv, xpvgv: GvNAME */
+ bool xivu_eval_seen; /* used internally by S_scan_subst() */
};
union _xmgu {
* Perl_filter_add() tries to do with the dirp), hence the
* following union trick (as suggested by Gurusamy Sarathy).
* For further information see Geir Johansen's problem report
- * titled [ID 20000612.002] Perl problem on Cray system
+ * titled [ID 20000612.002 (#3366)] Perl problem on Cray system
* The any pointer (known as IoANY()) will also be a good place
* to hang any IO disciplines to.
*/
and C<SvIV_set>>.
=for apidoc Am|void|SvLEN_set|SV* sv|STRLEN len
-Set the actual length of the string which is in the SV. See C<L</SvIV_set>>.
+Set the size of the string buffer for the SV. See C<L</SvLEN>>.
=cut
*/
#define SvOOK(sv) (SvFLAGS(sv) & SVf_OOK)
#define SvOOK_on(sv) (SvFLAGS(sv) |= SVf_OOK)
-#define SvOOK_off(sv) ((void)(SvOOK(sv) && sv_backoff(sv)))
+#define SvOOK_off(sv) ((void)(SvOOK(sv) && (sv_backoff(sv),0)))
#define SvFAKE(sv) (SvFLAGS(sv) & SVf_FAKE)
#define SvFAKE_on(sv) (SvFLAGS(sv) |= SVf_FAKE)
slot, you can't just do C<SvROK_off>, as that will leak the referent.
This is used internally by various sv-modifying functions, such as
-C<sv_setsv>, C<sv_setiv> and C<sv_pvn_force..
+C<sv_setsv>, C<sv_setiv> and C<sv_pvn_force>.
One case that this does not handle is a gv without SvFAKE set. After
#define SvOBJECT_on(sv) (SvFLAGS(sv) |= SVs_OBJECT)
#define SvOBJECT_off(sv) (SvFLAGS(sv) &= ~SVs_OBJECT)
+/*
+=for apidoc Am|U32|SvREADONLY|SV* sv
+Returns true if the argument is readonly, otherwise returns false.
+Exposed to to perl code via Internals::SvREADONLY().
+
+=for apidoc Am|U32|SvREADONLY_on|SV* sv
+Mark an object as readonly. Exactly what this means depends on the object
+type. Exposed to perl code via Internals::SvREADONLY().
+
+=for apidoc Am|U32|SvREADONLY_off|SV* sv
+Mark an object as not-readonly. Exactly what this mean depends on the
+object type. Exposed to perl code via Internals::SvREADONLY().
+
+=cut
+*/
+
#define SvREADONLY(sv) (SvFLAGS(sv) & (SVf_READONLY|SVf_PROTECT))
#ifdef PERL_CORE
# define SvREADONLY_on(sv) (SvFLAGS(sv) |= (SVf_READONLY|SVf_PROTECT))
# define SvCOMPILED_off(sv)
#endif
-#define SvEVALED(sv) (SvFLAGS(sv) & SVrepl_EVAL)
-#define SvEVALED_on(sv) (SvFLAGS(sv) |= SVrepl_EVAL)
-#define SvEVALED_off(sv) (SvFLAGS(sv) &= ~SVrepl_EVAL)
-
#if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
# define SvVALID(sv) ({ const SV *const _svvalid = (const SV*)(sv); \
if (SvFLAGS(_svvalid) & SVpbm_VALID && !SvSCREAM(_svvalid)) \
#define SvTAINT(sv) \
STMT_START { \
- if (UNLIKELY(TAINTING_get)) { \
- if (UNLIKELY(TAINT_get)) \
- SvTAINTED_on(sv); \
- } \
+ assert(TAINTING_get || !TAINT_get); \
+ if (UNLIKELY(TAINT_get)) \
+ SvTAINTED_on(sv); \
} STMT_END
/*
buffer. SV must be of type >= C<SVt_PV>. One
alternative is to call C<sv_grow> if you are not sure of the type of SV.
+=for apidoc Am|char *|SvPVCLEAR|SV* sv
+Ensures that sv is a SVt_PV and that its SvCUR is 0, and that it is
+properly null terminated. Equivalent to sv_setpvs(""), but more efficient.
+
=cut
*/
+#define SvPVCLEAR(sv) sv_setpv_bufsize(sv,0,0)
#define SvSHARE(sv) PL_sharehook(aTHX_ sv)
#define SvLOCK(sv) PL_lockhook(aTHX_ sv)
#define SvUNLOCK(sv) PL_unlockhook(aTHX_ sv)
#define SV_CONSTS_COUNT 35
/*
+ * Bodyless IVs and NVs!
+ *
+ * Since 5.9.2, we can avoid allocating a body for SVt_IV-type SVs.
+ * Since the larger IV-holding variants of SVs store their integer
+ * values in their respective bodies, the family of SvIV() accessor
+ * macros would naively have to branch on the SV type to find the
+ * integer value either in the HEAD or BODY. In order to avoid this
+ * expensive branch, a clever soul has deployed a great hack:
+ * We set up the SvANY pointer such that instead of pointing to a
+ * real body, it points into the memory before the location of the
+ * head. We compute this pointer such that the location of
+ * the integer member of the hypothetical body struct happens to
+ * be the same as the location of the integer member of the bodyless
+ * SV head. This now means that the SvIV() family of accessors can
+ * always read from the (hypothetical or real) body via SvANY.
+ *
+ * Since the 5.21 dev series, we employ the same trick for NVs
+ * if the architecture can support it (NVSIZE <= IVSIZE).
+ */
+
+/* The following two macros compute the necessary offsets for the above
+ * trick and store them in SvANY for SvIV() (and friends) to use. */
+
+#ifdef PERL_CORE
+# define SET_SVANY_FOR_BODYLESS_IV(sv) \
+ SvANY(sv) = (XPVIV*)((char*)&(sv->sv_u.svu_iv) \
+ - STRUCT_OFFSET(XPVIV, xiv_iv))
+
+# define SET_SVANY_FOR_BODYLESS_NV(sv) \
+ SvANY(sv) = (XPVNV*)((char*)&(sv->sv_u.svu_nv) \
+ - STRUCT_OFFSET(XPVNV, xnv_u.xnv_nv))
+#endif
+
+/*
* ex: set ts=8 sts=4 sw=4 et:
*/
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