X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/eb1102fcca2230364ceadea29bd8e87ee51b15fa..1bae32dbd424ceb6a38c45cad34e4ad65c83b682:/hv.h diff --git a/hv.h b/hv.h index 688663a..7f96a13 100644 --- a/hv.h +++ b/hv.h @@ -1,21 +1,24 @@ /* hv.h * - * Copyright (c) 1991-2002, Larry Wall + * Copyright (C) 1991, 1992, 1993, 1996, 1997, 1998, 1999, + * 2000, 2001, 2002, 2003, 2005, 2006, 2007, 2008, by Larry Wall and others * * You may distribute under the terms of either the GNU General Public * License or the Artistic License, as specified in the README file. * */ -/* typedefs to eliminate some typing */ -typedef struct he HE; -typedef struct hek HEK; - /* entry in hash value chain */ struct he { + /* Keep hent_next first in this structure, because sv_free_arenas take + advantage of this to share code between the he arenas and the SV + body arenas */ HE *hent_next; /* next entry in chain */ HEK *hent_hek; /* hash key */ - SV *hent_val; /* scalar value that was hashed */ + union { + SV *hent_val; /* scalar value that was hashed */ + Size_t hent_refcount; /* references for this shared hash key */ + } he_valu; }; /* hash key -- defined separately for use as shared pointer */ @@ -23,35 +26,104 @@ struct hek { U32 hek_hash; /* hash of key */ I32 hek_len; /* length of hash key */ char hek_key[1]; /* variable-length hash key */ + /* the hash-key is \0-terminated */ + /* after the \0 there is a byte for flags, such as whether the key + is UTF-8 */ +}; + +struct shared_he { + struct he shared_he_he; + struct hek shared_he_hek; }; +/* Subject to change. + Don't access this directly. + Use the funcs in mro.c +*/ + + +/* structure may change, so not public yet */ +struct mro_alg; + +struct mro_meta { + AV *mro_linear_dfs; /* cached dfs @ISA linearization */ + AV *mro_linear_c3; /* cached c3 @ISA linearization */ + HV *mro_nextmethod; /* next::method caching */ + U32 cache_gen; /* Bumping this invalidates our method cache */ + U32 pkg_gen; /* Bumps when local methods/@ISA change */ + const struct mro_alg *mro_which; /* which mro alg is in use? */ + HV *isa; /* Everything this class @ISA */ +}; + +/* Subject to change. + Don't access this directly. +*/ + +struct xpvhv_aux { + HEK *xhv_name; /* name, if a symbol table */ + AV *xhv_backreferences; /* back references for weak references */ + HE *xhv_eiter; /* current entry of iterator */ + I32 xhv_riter; /* current root of iterator */ + struct mro_meta *xhv_mro_meta; +}; + +#define _XPVHV_ALLOCATED_HEAD \ + STRLEN xhv_fill; /* how full xhv_array currently is */ \ + STRLEN xhv_max /* subscript of last element of xhv_array */ + +#define _XPVHV_HEAD \ + union _xnvu xnv_u; \ + _XPVHV_ALLOCATED_HEAD + /* hash structure: */ /* 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 */ -#define xhv_placeholders xnv_nv - 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 */ + _XPVHV_HEAD; + _XPVMG_HEAD; }; +#define xhv_keys xiv_u.xivu_iv + +typedef struct { + _XPVHV_ALLOCATED_HEAD; + _XPVMG_HEAD; +} xpvhv_allocated; + +#undef _XPVHV_ALLOCATED_HEAD +#undef _XPVHV_HEAD + /* hash a key */ -/* FYI: This is the "One-at-a-Time" algorithm by Bob Jenkins */ -/* from requirements by Colin Plumb. */ -/* (http://burtleburtle.net/bob/hash/doobs.html) */ +/* FYI: This is the "One-at-a-Time" algorithm by Bob Jenkins + * from requirements by Colin Plumb. + * (http://burtleburtle.net/bob/hash/doobs.html) */ +/* The use of a temporary pointer and the casting games + * is needed to serve the dual purposes of + * (a) the hashed data being interpreted as "unsigned char" (new since 5.8, + * a "char" can be either signed or unsigned, depending on the compiler) + * (b) catering for old code that uses a "char" + * + * The "hash seed" feature was added in Perl 5.8.1 to perturb the results + * to avoid "algorithmic complexity attacks". + * + * If USE_HASH_SEED is defined, hash randomisation is done by default + * If USE_HASH_SEED_EXPLICIT is defined, hash randomisation is done + * only if the environment variable PERL_HASH_SEED is set. + * For maximal control, one can define PERL_HASH_SEED. + * (see also perl.c:perl_parse()). + */ +#ifndef PERL_HASH_SEED +# if defined(USE_HASH_SEED) || defined(USE_HASH_SEED_EXPLICIT) +# define PERL_HASH_SEED PL_hash_seed +# else +# define PERL_HASH_SEED 0 +# endif +#endif #define PERL_HASH(hash,str,len) \ STMT_START { \ - register const char *s_PeRlHaSh = str; \ + register const char * const s_PeRlHaSh_tmp = str; \ + register const unsigned char *s_PeRlHaSh = (const unsigned char *)s_PeRlHaSh_tmp; \ register I32 i_PeRlHaSh = len; \ - register U32 hash_PeRlHaSh = 0; \ + register U32 hash_PeRlHaSh = PERL_HASH_SEED; \ while (i_PeRlHaSh--) { \ hash_PeRlHaSh += *s_PeRlHaSh++; \ hash_PeRlHaSh += (hash_PeRlHaSh << 10); \ @@ -62,6 +134,25 @@ struct xpvhv { (hash) = (hash_PeRlHaSh + (hash_PeRlHaSh << 15)); \ } STMT_END +/* Only hv.c and mod_perl should be doing this. */ +#ifdef PERL_HASH_INTERNAL_ACCESS +#define PERL_HASH_INTERNAL(hash,str,len) \ + STMT_START { \ + register const char * const s_PeRlHaSh_tmp = str; \ + register const unsigned char *s_PeRlHaSh = (const unsigned char *)s_PeRlHaSh_tmp; \ + register I32 i_PeRlHaSh = len; \ + register U32 hash_PeRlHaSh = PL_rehash_seed; \ + while (i_PeRlHaSh--) { \ + hash_PeRlHaSh += *s_PeRlHaSh++; \ + hash_PeRlHaSh += (hash_PeRlHaSh << 10); \ + hash_PeRlHaSh ^= (hash_PeRlHaSh >> 6); \ + } \ + hash_PeRlHaSh += (hash_PeRlHaSh << 3); \ + hash_PeRlHaSh ^= (hash_PeRlHaSh >> 11); \ + (hash) = (hash_PeRlHaSh + (hash_PeRlHaSh << 15)); \ + } STMT_END +#endif + /* =head1 Hash Manipulation Functions @@ -75,10 +166,13 @@ is to be expected. (For information only--not to be used). =for apidoc AmU||Nullhv Null HV pointer. +(deprecated - use C<(HV *)NULL> instead) + =head1 Hash Manipulation Functions =for apidoc Am|char*|HvNAME|HV* stash -Returns the package name of a stash. See C, C. +Returns the package name of a stash, or NULL if C isn't a stash. +See C, C. =for apidoc Am|void*|HeKEY|HE* he Returns the actual pointer stored in the key slot of the hash entry. The @@ -107,10 +201,21 @@ variable C, 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 or similar is not a good way to find the length of hash keys. This is very similar to the C macro -described elsewhere in this document. +described elsewhere in this document. See also C. + +If you are using C to get values to pass to C to create a +new SV, you should consider using C as it is more +efficient. + +=for apidoc Am|char*|HeUTF8|HE* he|STRLEN len +Returns whether the C value returned by C is encoded in UTF-8, +doing any necessary dereferencing of possibly C keys. The value returned +will be 0 or non-0, not necessarily 1 (or even a value with any low bits set), +so B blindly assign this to a C variable, as C may be a +typedef for C. =for apidoc Am|SV*|HeSVKEY|HE* he -Returns the key as an C, or C if the hash entry does not +Returns the key as an C, or C if the hash entry does not contain an C key. =for apidoc Am|SV*|HeSVKEY_force|HE* he @@ -128,93 +233,154 @@ C. /* these hash entry flags ride on hent_klen (for use only in magic/tied HVs) */ #define HEf_SVKEY -2 /* hent_key is an SV* */ - -#define Nullhv Null(HV*) -#define HvARRAY(hv) (*(HE***)&((XPVHV*) SvANY(hv))->xhv_array) +#ifndef PERL_CORE +# define Nullhv Null(HV*) +#endif +#define HvARRAY(hv) ((hv)->sv_u.svu_hash) #define HvFILL(hv) ((XPVHV*) SvANY(hv))->xhv_fill #define HvMAX(hv) ((XPVHV*) SvANY(hv))->xhv_max -#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 +/* This quite intentionally does no flag checking first. That's your + responsibility. */ +#define HvAUX(hv) ((struct xpvhv_aux*)&(HvARRAY(hv)[HvMAX(hv)+1])) +#define HvRITER(hv) (*Perl_hv_riter_p(aTHX_ (HV*)(hv))) +#define HvEITER(hv) (*Perl_hv_eiter_p(aTHX_ (HV*)(hv))) +#define HvRITER_set(hv,r) Perl_hv_riter_set(aTHX_ (HV*)(hv), r) +#define HvEITER_set(hv,e) Perl_hv_eiter_set(aTHX_ (HV*)(hv), e) +#define HvRITER_get(hv) (SvOOK(hv) ? HvAUX(hv)->xhv_riter : -1) +#define HvEITER_get(hv) (SvOOK(hv) ? HvAUX(hv)->xhv_eiter : NULL) +#define HvNAME(hv) HvNAME_get(hv) + +/* Checking that hv is a valid package stash is the + caller's responsibility */ +#define HvMROMETA(hv) (HvAUX(hv)->xhv_mro_meta \ + ? HvAUX(hv)->xhv_mro_meta \ + : mro_meta_init(hv)) + +/* FIXME - all of these should use a UTF8 aware API, which should also involve + getting the length. */ +/* This macro may go away without notice. */ +#define HvNAME_HEK(hv) (SvOOK(hv) ? HvAUX(hv)->xhv_name : NULL) +#define HvNAME_get(hv) ((SvOOK(hv) && (HvAUX(hv)->xhv_name)) \ + ? HEK_KEY(HvAUX(hv)->xhv_name) : NULL) +#define HvNAMELEN_get(hv) ((SvOOK(hv) && (HvAUX(hv)->xhv_name)) \ + ? HEK_LEN(HvAUX(hv)->xhv_name) : 0) /* the number of keys (including any placeholers) */ #define XHvTOTALKEYS(xhv) ((xhv)->xhv_keys) -/* The number of placeholders in the enumerated-keys hash */ -#define XHvPLACEHOLDERS(xhv) ((xhv)->xhv_placeholders) - -/* the number of keys that exist() (i.e. excluding placeholders) */ -#define XHvUSEDKEYS(xhv) (XHvTOTALKEYS(xhv) - (IV)XHvPLACEHOLDERS(xhv)) - /* * HvKEYS gets the number of keys that actually exist(), and is provided * for backwards compatibility with old XS code. The core uses HvUSEDKEYS * (keys, excluding placeholdes) and HvTOTALKEYS (including placeholders) */ -#define HvKEYS(hv) XHvUSEDKEYS((XPVHV*) SvANY(hv)) -#define HvUSEDKEYS(hv) XHvUSEDKEYS((XPVHV*) SvANY(hv)) +#define HvKEYS(hv) HvUSEDKEYS(hv) +#define HvUSEDKEYS(hv) (HvTOTALKEYS(hv) - HvPLACEHOLDERS_get(hv)) #define HvTOTALKEYS(hv) XHvTOTALKEYS((XPVHV*) SvANY(hv)) -#define HvPLACEHOLDERS(hv) XHvPLACEHOLDERS((XPVHV*) SvANY(hv)) - +#define HvPLACEHOLDERS(hv) (*Perl_hv_placeholders_p(aTHX_ (HV*)hv)) +#define HvPLACEHOLDERS_get(hv) (SvMAGIC(hv) ? Perl_hv_placeholders_get(aTHX_ (HV*)hv) : 0) +#define HvPLACEHOLDERS_set(hv,p) Perl_hv_placeholders_set(aTHX_ (HV*)hv, p) #define HvSHAREKEYS(hv) (SvFLAGS(hv) & SVphv_SHAREKEYS) #define HvSHAREKEYS_on(hv) (SvFLAGS(hv) |= SVphv_SHAREKEYS) #define HvSHAREKEYS_off(hv) (SvFLAGS(hv) &= ~SVphv_SHAREKEYS) +/* This is an optimisation flag. It won't be set if all hash keys have a 0 + * flag. Currently the only flags relate to utf8. + * Hence it won't be set if all keys are 8 bit only. It will be set if any key + * is utf8 (including 8 bit keys that were entered as utf8, and need upgrading + * when retrieved during iteration. It may still be set when there are no longer + * any utf8 keys. + * See HVhek_ENABLEHVKFLAGS for the trigger. + */ +#define HvHASKFLAGS(hv) (SvFLAGS(hv) & SVphv_HASKFLAGS) +#define HvHASKFLAGS_on(hv) (SvFLAGS(hv) |= SVphv_HASKFLAGS) +#define HvHASKFLAGS_off(hv) (SvFLAGS(hv) &= ~SVphv_HASKFLAGS) + #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 HvREHASH(hv) (SvFLAGS(hv) & SVphv_REHASH) +#define HvREHASH_on(hv) (SvFLAGS(hv) |= SVphv_REHASH) +#define HvREHASH_off(hv) (SvFLAGS(hv) &= ~SVphv_REHASH) -/* -#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*) +#ifndef PERL_CORE +# define Nullhe Null(HE*) +#endif #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 HeKUTF8(he) HEK_UTF8(HeKEY_hek(he)) +#define HeKWASUTF8(he) HEK_WASUTF8(HeKEY_hek(he)) +#define HeKREHASH(he) HEK_REHASH(HeKEY_hek(he)) #define HeKLEN_UTF8(he) (HeKUTF8(he) ? -HeKLEN(he) : HeKLEN(he)) -#define HeVAL(he) (he)->hent_val +#define HeKFLAGS(he) HEK_FLAGS(HeKEY_hek(he)) +#define HeVAL(he) (he)->he_valu.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)) + ((lp = HeKLEN(he)), HeKEY(he))) +#define HeUTF8(he) ((HeKLEN(he) == HEf_SVKEY) ? \ + SvUTF8(HeKEY_sv(he)) : \ + (U32)HeKUTF8(he)) #define HeSVKEY(he) ((HeKEY(he) && \ HeKLEN(he) == HEf_SVKEY) ? \ - HeKEY_sv(he) : Nullsv) + HeKEY_sv(he) : NULL) #define HeSVKEY_force(he) (HeKEY(he) ? \ ((HeKLEN(he) == HEf_SVKEY) ? \ HeKEY_sv(he) : \ - sv_2mortal(newSVpvn(HeKEY(he), \ - HeKLEN(he)))) : \ + newSVpvn_flags(HeKEY(he), \ + HeKLEN(he), SVs_TEMP)) : \ &PL_sv_undef) #define HeSVKEY_set(he,sv) ((HeKLEN(he) = HEf_SVKEY), (HeKEY_sv(he) = sv)) -#define Nullhek Null(HEK*) +#ifndef PERL_CORE +# define Nullhek Null(HEK*) +#endif #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 -#define HEK_UTF8(hek) (*(HEK_KEY(hek)+HEK_LEN(hek))) +#define HEK_FLAGS(hek) (*((unsigned char *)(HEK_KEY(hek))+HEK_LEN(hek)+1)) + +#define HVhek_UTF8 0x01 /* Key is utf8 encoded. */ +#define HVhek_WASUTF8 0x02 /* Key is bytes here, but was supplied as utf8. */ +#define HVhek_REHASH 0x04 /* This key is in an hv using a custom HASH . */ +#define HVhek_UNSHARED 0x08 /* This key isn't a shared hash key. */ +#define HVhek_FREEKEY 0x100 /* Internal flag to say key is malloc()ed. */ +#define HVhek_PLACEHOLD 0x200 /* Internal flag to create placeholder. + * (may change, but Storable is a core module) */ +#define HVhek_MASK 0xFF + +/* Which flags enable HvHASKFLAGS? Somewhat a hack on a hack, as + HVhek_REHASH is only needed because the rehash flag has to be duplicated + into all keys as hv_iternext has no access to the hash flags. At this + point Storable's tests get upset, because sometimes hashes are "keyed" + and sometimes not, depending on the order of data insertion, and whether + it triggered rehashing. So currently HVhek_REHASH is exempt. + Similarly UNSHARED +*/ + +#define HVhek_ENABLEHVKFLAGS (HVhek_MASK & ~(HVhek_REHASH|HVhek_UNSHARED)) + +#define HEK_UTF8(hek) (HEK_FLAGS(hek) & HVhek_UTF8) +#define HEK_UTF8_on(hek) (HEK_FLAGS(hek) |= HVhek_UTF8) +#define HEK_UTF8_off(hek) (HEK_FLAGS(hek) &= ~HVhek_UTF8) +#define HEK_WASUTF8(hek) (HEK_FLAGS(hek) & HVhek_WASUTF8) +#define HEK_WASUTF8_on(hek) (HEK_FLAGS(hek) |= HVhek_WASUTF8) +#define HEK_WASUTF8_off(hek) (HEK_FLAGS(hek) &= ~HVhek_WASUTF8) +#define HEK_REHASH(hek) (HEK_FLAGS(hek) & HVhek_REHASH) +#define HEK_REHASH_on(hek) (HEK_FLAGS(hek) |= HVhek_REHASH) /* calculate HV array allocation */ -#if defined(STRANGE_MALLOC) || defined(MYMALLOC) +#ifndef PERL_USE_LARGE_HV_ALLOC +/* Default to allocating the correct size - default to assuming that malloc() + is not broken and is efficient at allocating blocks sized at powers-of-two. +*/ # define PERL_HV_ARRAY_ALLOC_BYTES(size) ((size) * sizeof(HE*)) #else # define MALLOC_OVERHEAD 16 @@ -224,6 +390,155 @@ C. : (size) * sizeof(HE*) * 2 - MALLOC_OVERHEAD) #endif +/* Flags for hv_iternext_flags. */ +#define HV_ITERNEXT_WANTPLACEHOLDERS 0x01 /* Don't skip placeholders. */ + +#define hv_iternext(hv) hv_iternext_flags(hv, 0) +#define hv_magic(hv, gv, how) sv_magic((SV*)(hv), (SV*)(gv), how, NULL, 0) + /* available as a function in hv.c */ #define Perl_sharepvn(sv, len, hash) HEK_KEY(share_hek(sv, len, hash)) #define sharepvn(sv, len, hash) Perl_sharepvn(sv, len, hash) + +#define share_hek_hek(hek) \ + (++(((struct shared_he *)(((char *)hek) \ + - STRUCT_OFFSET(struct shared_he, \ + shared_he_hek))) \ + ->shared_he_he.he_valu.hent_refcount), \ + hek) + +#define hv_store_ent(hv, keysv, val, hash) \ + ((HE *) hv_common((hv), (keysv), NULL, 0, 0, HV_FETCH_ISSTORE, \ + (val), (hash))) + +#define hv_exists_ent(hv, keysv, hash) \ + (hv_common((hv), (keysv), NULL, 0, 0, HV_FETCH_ISEXISTS, 0, (hash)) \ + ? TRUE : FALSE) +#define hv_fetch_ent(hv, keysv, lval, hash) \ + ((HE *) hv_common((hv), (keysv), NULL, 0, 0, \ + ((lval) ? HV_FETCH_LVALUE : 0), NULL, (hash))) +#define hv_delete_ent(hv, key, flags, hash) \ + ((SV *) hv_common((hv), (key), NULL, 0, 0, (flags) | HV_DELETE, \ + NULL, (hash))) + +#define hv_store_flags(hv, key, klen, val, hash, flags) \ + ((SV**) hv_common((hv), NULL, (key), (klen), (flags), \ + (HV_FETCH_ISSTORE|HV_FETCH_JUST_SV), (val), \ + (hash))) + +#define hv_store(hv, key, klen, val, hash) \ + ((SV**) hv_common_key_len((hv), (key), (klen), \ + (HV_FETCH_ISSTORE|HV_FETCH_JUST_SV), \ + (val), (hash))) + +#define hv_exists(hv, key, klen) \ + (hv_common_key_len((hv), (key), (klen), HV_FETCH_ISEXISTS, NULL, 0) \ + ? TRUE : FALSE) + +#define hv_fetch(hv, key, klen, lval) \ + ((SV**) hv_common_key_len((hv), (key), (klen), (lval) \ + ? (HV_FETCH_JUST_SV | HV_FETCH_LVALUE) \ + : HV_FETCH_JUST_SV, NULL, 0)) + +#define hv_delete(hv, key, klen, flags) \ + ((SV*) hv_common_key_len((hv), (key), (klen), \ + (flags) | HV_DELETE, NULL, 0)) + +/* This refcounted he structure is used for storing the hints used for lexical + pragmas. Without threads, it's basically struct he + refcount. + With threads, life gets more complex as the structure needs to be shared + between threads (because it hangs from OPs, which are shared), hence the + alternate definition and mutex. */ + +struct refcounted_he; + +#ifdef PERL_CORE + +/* Gosh. This really isn't a good name any longer. */ +struct refcounted_he { + struct refcounted_he *refcounted_he_next; /* next entry in chain */ +#ifdef USE_ITHREADS + U32 refcounted_he_hash; + U32 refcounted_he_keylen; +#else + HEK *refcounted_he_hek; /* hint key */ +#endif + union { + IV refcounted_he_u_iv; + UV refcounted_he_u_uv; + STRLEN refcounted_he_u_len; + void *refcounted_he_u_ptr; /* Might be useful in future */ + } refcounted_he_val; + U32 refcounted_he_refcnt; /* reference count */ + /* First byte is flags. Then NUL-terminated value. Then for ithreads, + non-NUL terminated key. */ + char refcounted_he_data[1]; +}; + +/* Flag bits are HVhek_UTF8, HVhek_WASUTF8, then */ +#define HVrhek_undef 0x00 /* Value is undef. */ +#define HVrhek_delete 0x10 /* Value is placeholder - signifies delete. */ +#define HVrhek_IV 0x20 /* Value is IV. */ +#define HVrhek_UV 0x30 /* Value is UV. */ +#define HVrhek_PV 0x40 /* Value is a (byte) string. */ +#define HVrhek_PV_UTF8 0x50 /* Value is a (utf8) string. */ +/* Two spare. As these have to live in the optree, you can't store anything + interpreter specific, such as SVs. :-( */ +#define HVrhek_typemask 0x70 + +#ifdef USE_ITHREADS +/* A big expression to find the key offset */ +#define REF_HE_KEY(chain) \ + ((((chain->refcounted_he_data[0] & 0x60) == 0x40) \ + ? chain->refcounted_he_val.refcounted_he_u_len + 1 : 0) \ + + 1 + chain->refcounted_he_data) +#endif + +# ifdef USE_ITHREADS +# define HINTS_REFCNT_LOCK MUTEX_LOCK(&PL_hints_mutex) +# define HINTS_REFCNT_UNLOCK MUTEX_UNLOCK(&PL_hints_mutex) +# else +# define HINTS_REFCNT_LOCK NOOP +# define HINTS_REFCNT_UNLOCK NOOP +# endif +#endif + +#ifdef USE_ITHREADS +# define HINTS_REFCNT_INIT MUTEX_INIT(&PL_hints_mutex) +# define HINTS_REFCNT_TERM MUTEX_DESTROY(&PL_hints_mutex) +#else +# define HINTS_REFCNT_INIT NOOP +# define HINTS_REFCNT_TERM NOOP +#endif + +/* Hash actions + * Passed in PERL_MAGIC_uvar calls + */ +#define HV_DISABLE_UVAR_XKEY 0x01 +/* We need to ensure that these don't clash with G_DISCARD, which is 2, as it + is documented as being passed to hv_delete(). */ +#define HV_FETCH_ISSTORE 0x04 +#define HV_FETCH_ISEXISTS 0x08 +#define HV_FETCH_LVALUE 0x10 +#define HV_FETCH_JUST_SV 0x20 +#define HV_DELETE 0x40 + +/* +=for apidoc newHV + +Creates a new HV. The reference count is set to 1. + +=cut +*/ + +#define newHV() ((HV*)newSV_type(SVt_PVHV)) + +/* + * Local variables: + * c-indentation-style: bsd + * c-basic-offset: 4 + * indent-tabs-mode: t + * End: + * + * ex: set ts=8 sts=4 sw=4 noet: + */