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- /* hv.h
- *
- * Copyright (c) 1991-2000, Larry Wall
- *
- * You may distribute under the terms of either the GNU General Public
- * License or the Artistic License, as specified in the README file.
- *
- */
-
- typedef struct he HE;
- typedef struct hek HEK;
-
- struct he {
- HE *hent_next;
- HEK *hent_hek;
- SV *hent_val;
- };
-
- struct hek {
- U32 hek_hash;
- I32 hek_len;
- char hek_key[1];
- };
-
- /* This structure must match the beginning of struct xpvmg in sv.h. */
- struct xpvhv {
- char * xhv_array; /* pointer to malloced string */
- STRLEN xhv_fill; /* how full xhv_array currently is */
- STRLEN xhv_max; /* subscript of last element of xhv_array */
- IV xhv_keys; /* how many elements in the array */
- NV xnv_nv; /* numeric value, if any */
- MAGIC* xmg_magic; /* magic for scalar array */
- HV* xmg_stash; /* class package */
-
- I32 xhv_riter; /* current root of iterator */
- HE *xhv_eiter; /* current entry of iterator */
- PMOP *xhv_pmroot; /* list of pm's for this package */
- char *xhv_name; /* name, if a symbol table */
- };
-
- #define PERL_HASH(hash,str,len) \
- STMT_START { \
- register const char *s_PeRlHaSh = str; \
- register I32 i_PeRlHaSh = len; \
- register U32 hash_PeRlHaSh = 0; \
- while (i_PeRlHaSh--) \
- hash_PeRlHaSh = hash_PeRlHaSh * 33 + *s_PeRlHaSh++; \
- (hash) = hash_PeRlHaSh + (hash_PeRlHaSh>>5); \
- } STMT_END
-
- /*
- =for apidoc AmU||HEf_SVKEY
- This flag, used in the length slot of hash entries and magic structures,
- specifies the structure contains a C<SV*> pointer where a C<char*> pointer
- is to be expected. (For information only--not to be used).
-
- =for apidoc AmU||Nullhv
- Null HV pointer.
-
- =for apidoc Am|char*|HvNAME|HV* stash
- Returns the package name of a stash. See C<SvSTASH>, C<CvSTASH>.
-
- =for apidoc Am|void*|HeKEY|HE* he
- Returns the actual pointer stored in the key slot of the hash entry. The
- pointer may be either C<char*> or C<SV*>, depending on the value of
- C<HeKLEN()>. Can be assigned to. The C<HePV()> or C<HeSVKEY()> macros are
- usually preferable for finding the value of a key.
-
- =for apidoc Am|STRLEN|HeKLEN|HE* he
- If this is negative, and amounts to C<HEf_SVKEY>, it indicates the entry
- holds an C<SV*> key. Otherwise, holds the actual length of the key. Can
- be assigned to. The C<HePV()> macro is usually preferable for finding key
- lengths.
-
- =for apidoc Am|SV*|HeVAL|HE* he
- Returns the value slot (type C<SV*>) stored in the hash entry.
-
- =for apidoc Am|U32|HeHASH|HE* he
- Returns the computed hash stored in the hash entry.
-
- =for apidoc Am|char*|HePV|HE* he|STRLEN len
- Returns the key slot of the hash entry as a C<char*> value, doing any
- necessary dereferencing of possibly C<SV*> keys. The length of the string
- is placed in C<len> (this is a macro, so do I<not> use C<&len>). If you do
- not care about what the length of the key is, you may use the global
- variable C<PL_na>, though this is rather less efficient than using a local
- variable. Remember though, that hash keys in perl are free to contain
- embedded nulls, so using C<strlen()> or similar is not a good way to find
- the length of hash keys. This is very similar to the C<SvPV()> macro
- described elsewhere in this document.
-
- =for apidoc Am|SV*|HeSVKEY|HE* he
- Returns the key as an C<SV*>, or C<Nullsv> if the hash entry does not
- contain an C<SV*> key.
-
- =for apidoc Am|SV*|HeSVKEY_force|HE* he
- Returns the key as an C<SV*>. Will create and return a temporary mortal
- C<SV*> if the hash entry contains only a C<char*> key.
-
- =for apidoc Am|SV*|HeSVKEY_set|HE* he|SV* sv
- Sets the key to a given C<SV*>, taking care to set the appropriate flags to
- indicate the presence of an C<SV*> key, and returns the same
- C<SV*>.
-
- =cut
- */
-
- /* these hash entry flags ride on hent_klen (for use only in magic/tied HVs) */
- #define HEf_SVKEY -2 /* hent_key is a SV* */
-
-
- #define Nullhv Null(HV*)
- #define HvARRAY(hv) ((HE**)((XPVHV*) SvANY(hv))->xhv_array)
- #define HvFILL(hv) ((XPVHV*) SvANY(hv))->xhv_fill
- #define HvMAX(hv) ((XPVHV*) SvANY(hv))->xhv_max
- #define HvKEYS(hv) ((XPVHV*) SvANY(hv))->xhv_keys
- #define HvRITER(hv) ((XPVHV*) SvANY(hv))->xhv_riter
- #define HvEITER(hv) ((XPVHV*) SvANY(hv))->xhv_eiter
- #define HvPMROOT(hv) ((XPVHV*) SvANY(hv))->xhv_pmroot
- #define HvNAME(hv) ((XPVHV*) SvANY(hv))->xhv_name
-
- #define HvSHAREKEYS(hv) (SvFLAGS(hv) & SVphv_SHAREKEYS)
- #define HvSHAREKEYS_on(hv) (SvFLAGS(hv) |= SVphv_SHAREKEYS)
- #define HvSHAREKEYS_off(hv) (SvFLAGS(hv) &= ~SVphv_SHAREKEYS)
-
- #define HvLAZYDEL(hv) (SvFLAGS(hv) & SVphv_LAZYDEL)
- #define HvLAZYDEL_on(hv) (SvFLAGS(hv) |= SVphv_LAZYDEL)
- #define HvLAZYDEL_off(hv) (SvFLAGS(hv) &= ~SVphv_LAZYDEL)
-
- /* Maybe amagical: */
- /* #define HV_AMAGICmb(hv) (SvFLAGS(hv) & (SVpgv_badAM | SVpgv_AM)) */
-
- #define HV_AMAGIC(hv) (SvFLAGS(hv) & SVpgv_AM)
- #define HV_AMAGIC_on(hv) (SvFLAGS(hv) |= SVpgv_AM)
- #define HV_AMAGIC_off(hv) (SvFLAGS(hv) &= ~SVpgv_AM)
-
- /*
- #define HV_AMAGICbad(hv) (SvFLAGS(hv) & SVpgv_badAM)
- #define HV_badAMAGIC_on(hv) (SvFLAGS(hv) |= SVpgv_badAM)
- #define HV_badAMAGIC_off(hv) (SvFLAGS(hv) &= ~SVpgv_badAM)
- */
-
- #define Nullhe Null(HE*)
- #define HeNEXT(he) (he)->hent_next
- #define HeKEY_hek(he) (he)->hent_hek
- #define HeKEY(he) HEK_KEY(HeKEY_hek(he))
- #define HeKEY_sv(he) (*(SV**)HeKEY(he))
- #define HeKLEN(he) HEK_LEN(HeKEY_hek(he))
- #define HeVAL(he) (he)->hent_val
- #define HeHASH(he) HEK_HASH(HeKEY_hek(he))
- #define HePV(he,lp) ((HeKLEN(he) == HEf_SVKEY) ? \
- SvPV(HeKEY_sv(he),lp) : \
- (((lp = HeKLEN(he)) >= 0) ? \
- HeKEY(he) : Nullch))
-
- #define HeSVKEY(he) ((HeKEY(he) && \
- HeKLEN(he) == HEf_SVKEY) ? \
- HeKEY_sv(he) : Nullsv)
-
- #define HeSVKEY_force(he) (HeKEY(he) ? \
- ((HeKLEN(he) == HEf_SVKEY) ? \
- HeKEY_sv(he) : \
- sv_2mortal(newSVpvn(HeKEY(he), \
- HeKLEN(he)))) : \
- &PL_sv_undef)
- #define HeSVKEY_set(he,sv) ((HeKLEN(he) = HEf_SVKEY), (HeKEY_sv(he) = sv))
-
- #define Nullhek Null(HEK*)
- #define HEK_BASESIZE STRUCT_OFFSET(HEK, hek_key[0])
- #define HEK_HASH(hek) (hek)->hek_hash
- #define HEK_LEN(hek) (hek)->hek_len
- #define HEK_KEY(hek) (hek)->hek_key
-
- #if defined(STRANGE_MALLOC) || defined(MYMALLOC)
- # define PERL_HV_ARRAY_ALLOC_BYTES(size) ((size) * sizeof(HE*))
- #else
- # define MALLOC_OVERHEAD 16
- # define PERL_HV_ARRAY_ALLOC_BYTES(size) \
- (((size) < 64) \
- ? (size) * sizeof(HE*) \
- : (size) * sizeof(HE*) * 2 - MALLOC_OVERHEAD)
- #endif
-