X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=hv.c;h=fd2c2d7c6f94f0fbcd14626ff9c96d656295d68b;hb=dcd846f4e75a65911ac82259fb309a534622cbd6;hp=e38c785f05705acc23d244975e57f6a976912b20;hpb=d18c61170a30691556a1da7413e13241a92f4e0a;p=p5sagit%2Fp5-mst-13.2.git diff --git a/hv.c b/hv.c index e38c785..fd2c2d7 100644 --- a/hv.c +++ b/hv.c @@ -1,6 +1,6 @@ /* hv.c * - * Copyright (c) 1991-1999, Larry Wall + * 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. @@ -52,6 +52,18 @@ S_more_he(pTHX) HeNEXT(he) = 0; } +#ifdef PURIFY + +#define new_HE() (HE*)safemalloc(sizeof(HE)) +#define del_HE(p) safefree((char*)p) + +#else + +#define new_HE() new_he() +#define del_HE(p) del_he(p) + +#endif + STATIC HEK * S_save_hek(pTHX_ const char *str, I32 len, U32 hash) { @@ -81,8 +93,16 @@ Perl_he_dup(pTHX_ HE *e, bool shared) if (!e) return Nullhe; - ret = new_he(); - HeNEXT(ret) = (HE*)NULL; + /* look for it in the table first */ + ret = (HE*)ptr_table_fetch(PL_ptr_table, e); + if (ret) + return ret; + + /* create anew and remember what it is */ + ret = new_HE(); + ptr_table_store(PL_ptr_table, e, ret); + + HeNEXT(ret) = he_dup(HeNEXT(e),shared); if (HeKLEN(e) == HEf_SVKEY) HeKEY_sv(ret) = SvREFCNT_inc(sv_dup(HeKEY_sv(e))); else if (shared) @@ -97,6 +117,20 @@ Perl_he_dup(pTHX_ HE *e, bool shared) /* (klen == HEf_SVKEY) is special for MAGICAL hv entries, meaning key slot * contains an SV* */ +/* +=for apidoc hv_fetch + +Returns the SV which corresponds to the specified key in the hash. The +C is the length of the key. If C is set then the fetch will be +part of a store. Check that the return value is non-null before +dereferencing it to a C. + +See L for more +information on how to use this function on tied hashes. + +=cut +*/ + SV** Perl_hv_fetch(pTHX_ HV *hv, const char *key, U32 klen, I32 lval) { @@ -176,6 +210,23 @@ Perl_hv_fetch(pTHX_ HV *hv, const char *key, U32 klen, I32 lval) /* returns a HE * structure with the all fields set */ /* note that hent_val will be a mortal sv for MAGICAL hashes */ +/* +=for apidoc hv_fetch_ent + +Returns the hash entry which corresponds to the specified key in the hash. +C must be a valid precomputed hash number for the given C, or 0 +if you want the function to compute it. IF C is set then the fetch +will be part of a store. Make sure the return value is non-null before +accessing it. The return value when C is a tied hash is a pointer to a +static location, so be sure to make a copy of the structure if you need to +store it somewhere. + +See L for more +information on how to use this function on tied hashes. + +=cut +*/ + HE * Perl_hv_fetch_ent(pTHX_ HV *hv, SV *keysv, I32 lval, register U32 hash) { @@ -285,6 +336,24 @@ S_hv_magic_check(pTHX_ HV *hv, bool *needs_copy, bool *needs_store) } } +/* +=for apidoc hv_store + +Stores an SV in a hash. The hash key is specified as C and C is +the length of the key. The C parameter is the precomputed hash +value; if it is zero then Perl will compute it. The return value will be +NULL if the operation failed or if the value did not need to be actually +stored within the hash (as in the case of tied hashes). Otherwise it can +be dereferenced to get the original C. Note that the caller is +responsible for suitably incrementing the reference count of C before +the call, and decrementing it if the function returned NULL. + +See L for more +information on how to use this function on tied hashes. + +=cut +*/ + SV** Perl_hv_store(pTHX_ HV *hv, const char *key, U32 klen, SV *val, register U32 hash) { @@ -336,7 +405,7 @@ Perl_hv_store(pTHX_ HV *hv, const char *key, U32 klen, SV *val, register U32 has return &HeVAL(entry); } - entry = new_he(); + entry = new_HE(); if (HvSHAREKEYS(hv)) HeKEY_hek(entry) = share_hek(key, klen, hash); else /* gotta do the real thing */ @@ -355,6 +424,25 @@ Perl_hv_store(pTHX_ HV *hv, const char *key, U32 klen, SV *val, register U32 has return &HeVAL(entry); } +/* +=for apidoc hv_store_ent + +Stores C in a hash. The hash key is specified as C. The C +parameter is the precomputed hash value; if it is zero then Perl will +compute it. The return value is the new hash entry so created. It will be +NULL if the operation failed or if the value did not need to be actually +stored within the hash (as in the case of tied hashes). Otherwise the +contents of the return value can be accessed using the C macros +described here. Note that the caller is responsible for suitably +incrementing the reference count of C before the call, and +decrementing it if the function returned NULL. + +See L for more +information on how to use this function on tied hashes. + +=cut +*/ + HE * Perl_hv_store_ent(pTHX_ HV *hv, SV *keysv, SV *val, register U32 hash) { @@ -418,7 +506,7 @@ Perl_hv_store_ent(pTHX_ HV *hv, SV *keysv, SV *val, register U32 hash) return entry; } - entry = new_he(); + entry = new_HE(); if (HvSHAREKEYS(hv)) HeKEY_hek(entry) = share_hek(key, klen, hash); else /* gotta do the real thing */ @@ -437,6 +525,17 @@ Perl_hv_store_ent(pTHX_ HV *hv, SV *keysv, SV *val, register U32 hash) return entry; } +/* +=for apidoc hv_delete + +Deletes a key/value pair in the hash. The value SV is removed from the +hash and returned to the caller. The C is the length of the key. +The C value will normally be zero; if set to G_DISCARD then NULL +will be returned. + +=cut +*/ + SV * Perl_hv_delete(pTHX_ HV *hv, const char *key, U32 klen, I32 flags) { @@ -494,8 +593,10 @@ Perl_hv_delete(pTHX_ HV *hv, const char *key, U32 klen, I32 flags) xhv->xhv_fill--; if (flags & G_DISCARD) sv = Nullsv; - else - sv = sv_mortalcopy(HeVAL(entry)); + else { + sv = sv_2mortal(HeVAL(entry)); + HeVAL(entry) = &PL_sv_undef; + } if (entry == xhv->xhv_eiter) HvLAZYDEL_on(hv); else @@ -506,6 +607,17 @@ Perl_hv_delete(pTHX_ HV *hv, const char *key, U32 klen, I32 flags) return Nullsv; } +/* +=for apidoc hv_delete_ent + +Deletes a key/value pair in the hash. The value SV is removed from the +hash and returned to the caller. The C value will normally be zero; +if set to G_DISCARD then NULL will be returned. C can be a valid +precomputed hash value, or 0 to ask for it to be computed. + +=cut +*/ + SV * Perl_hv_delete_ent(pTHX_ HV *hv, SV *keysv, I32 flags, U32 hash) { @@ -568,8 +680,10 @@ Perl_hv_delete_ent(pTHX_ HV *hv, SV *keysv, I32 flags, U32 hash) xhv->xhv_fill--; if (flags & G_DISCARD) sv = Nullsv; - else - sv = sv_mortalcopy(HeVAL(entry)); + else { + sv = sv_2mortal(HeVAL(entry)); + HeVAL(entry) = &PL_sv_undef; + } if (entry == xhv->xhv_eiter) HvLAZYDEL_on(hv); else @@ -580,6 +694,15 @@ Perl_hv_delete_ent(pTHX_ HV *hv, SV *keysv, I32 flags, U32 hash) return Nullsv; } +/* +=for apidoc hv_exists + +Returns a boolean indicating whether the specified hash key exists. The +C is the length of the key. + +=cut +*/ + bool Perl_hv_exists(pTHX_ HV *hv, const char *key, U32 klen) { @@ -645,6 +768,16 @@ Perl_hv_exists(pTHX_ HV *hv, const char *key, U32 klen) } +/* +=for apidoc hv_exists_ent + +Returns a boolean indicating whether the specified hash key exists. C +can be a valid precomputed hash value, or 0 to ask for it to be +computed. + +=cut +*/ + bool Perl_hv_exists_ent(pTHX_ HV *hv, SV *keysv, U32 hash) { @@ -855,6 +988,14 @@ Perl_hv_ksplit(pTHX_ HV *hv, IV newmax) } } +/* +=for apidoc newHV + +Creates a new HV. The reference count is set to 1. + +=cut +*/ + HV * Perl_newHV(pTHX) { @@ -933,7 +1074,7 @@ Perl_hv_free_ent(pTHX_ HV *hv, register HE *entry) unshare_hek(HeKEY_hek(entry)); else Safefree(HeKEY_hek(entry)); - del_he(entry); + del_HE(entry); } void @@ -952,9 +1093,17 @@ Perl_hv_delayfree_ent(pTHX_ HV *hv, register HE *entry) unshare_hek(HeKEY_hek(entry)); else Safefree(HeKEY_hek(entry)); - del_he(entry); + del_HE(entry); } +/* +=for apidoc hv_clear + +Clears a hash, making it empty. + +=cut +*/ + void Perl_hv_clear(pTHX_ HV *hv) { @@ -1005,6 +1154,14 @@ S_hfreeentries(pTHX_ HV *hv) (void)hv_iterinit(hv); } +/* +=for apidoc hv_undef + +Undefines the hash. + +=cut +*/ + void Perl_hv_undef(pTHX_ HV *hv) { @@ -1027,6 +1184,20 @@ Perl_hv_undef(pTHX_ HV *hv) mg_clear((SV*)hv); } +/* +=for apidoc hv_iterinit + +Prepares a starting point to traverse a hash table. Returns the number of +keys in the hash (i.e. the same as C). The return value is +currently only meaningful for hashes without tie magic. + +NOTE: Before version 5.004_65, C used to return the number of +hash buckets that happen to be in use. If you still need that esoteric +value, you can get it through the macro C. + +=cut +*/ + I32 Perl_hv_iterinit(pTHX_ HV *hv) { @@ -1046,6 +1217,14 @@ Perl_hv_iterinit(pTHX_ HV *hv) return xhv->xhv_keys; /* used to be xhv->xhv_fill before 5.004_65 */ } +/* +=for apidoc hv_iternext + +Returns entries from a hash iterator. See C. + +=cut +*/ + HE * Perl_hv_iternext(pTHX_ HV *hv) { @@ -1069,7 +1248,7 @@ Perl_hv_iternext(pTHX_ HV *hv) char *k; HEK *hek; - xhv->xhv_eiter = entry = new_he(); /* one HE per MAGICAL hash */ + xhv->xhv_eiter = entry = new_HE(); /* one HE per MAGICAL hash */ Zero(entry, 1, HE); Newz(54, k, HEK_BASESIZE + sizeof(SV*), char); hek = (HEK*)k; @@ -1085,7 +1264,7 @@ Perl_hv_iternext(pTHX_ HV *hv) if (HeVAL(entry)) SvREFCNT_dec(HeVAL(entry)); Safefree(HeKEY_hek(entry)); - del_he(entry); + del_HE(entry); xhv->xhv_eiter = Null(HE*); return Null(HE*); } @@ -1117,6 +1296,15 @@ Perl_hv_iternext(pTHX_ HV *hv) return entry; } +/* +=for apidoc hv_iterkey + +Returns the key from the current position of the hash iterator. See +C. + +=cut +*/ + char * Perl_hv_iterkey(pTHX_ register HE *entry, I32 *retlen) { @@ -1133,6 +1321,16 @@ Perl_hv_iterkey(pTHX_ register HE *entry, I32 *retlen) } /* unlike hv_iterval(), this always returns a mortal copy of the key */ +/* +=for apidoc hv_iterkeysv + +Returns the key as an C from the current position of the hash +iterator. The return value will always be a mortal copy of the key. Also +see C. + +=cut +*/ + SV * Perl_hv_iterkeysv(pTHX_ register HE *entry) { @@ -1143,6 +1341,15 @@ Perl_hv_iterkeysv(pTHX_ register HE *entry) HeKLEN(entry))); } +/* +=for apidoc hv_iterval + +Returns the value from the current position of the hash iterator. See +C. + +=cut +*/ + SV * Perl_hv_iterval(pTHX_ HV *hv, register HE *entry) { @@ -1158,6 +1365,15 @@ Perl_hv_iterval(pTHX_ HV *hv, register HE *entry) return HeVAL(entry); } +/* +=for apidoc hv_iternextsv + +Performs an C, C, and C in one +operation. + +=cut +*/ + SV * Perl_hv_iternextsv(pTHX_ HV *hv, char **key, I32 *retlen) { @@ -1168,6 +1384,14 @@ Perl_hv_iternextsv(pTHX_ HV *hv, char **key, I32 *retlen) return hv_iterval(hv, he); } +/* +=for apidoc hv_magic + +Adds magic to a hash. See C. + +=cut +*/ + void Perl_hv_magic(pTHX_ HV *hv, GV *gv, int how) { @@ -1214,7 +1438,7 @@ Perl_unsharepvn(pTHX_ const char *str, I32 len, U32 hash) if (i && !*oentry) xhv->xhv_fill--; Safefree(HeKEY_hek(entry)); - del_he(entry); + del_HE(entry); --xhv->xhv_keys; } break; @@ -1261,7 +1485,7 @@ Perl_share_hek(pTHX_ const char *str, I32 len, register U32 hash) break; } if (!found) { - entry = new_he(); + entry = new_HE(); HeKEY_hek(entry) = save_hek(str, len, hash); HeVAL(entry) = Nullsv; HeNEXT(entry) = *oentry;