/* Magic cookies to recognize object id's. Hi, Eva, David */
#define HUF_COOKIE 2805.1980
#define HUF_REFADDR_COOKIE 1811.1976
+/* Identifier for PERL_MAGIC_ext magic */
+#define HUF_IDCACHE 0x4944
/* For global cache of object registry */
#define MY_CXT_KEY "Hash::Util::FieldHash::_guts" XS_VERSION
}
}
-/* the id as an SV, optionally marked in the nv (unused feature) */
-SV* HUF_id(SV* ref, NV cookie) {
- SV* id = sv_newmortal();
- if (cookie == 0 ) {
- SvUPGRADE(id, SVt_PVIV);
- } else {
- SvUPGRADE(id, SVt_PVNV);
- SvNV_set(id, cookie);
- SvNOK_on(id);
- }
- SvIV_set(id, PTR2UV(SvRV(ref)));
- SvIOK_on(id);
- return id;
-}
+/* Object id */
-/* plain id, only used for field hash entries in field lists */
-SV* HUF_field_id(SV* obj) {
- return HUF_id(obj, 0.0);
-}
+/* definition of id transformation */
+#define HUF_OBJ_ID(x) newSVuv(PTR2UV(x))
-/* object id (same as plain, may be different in future) */
SV* HUF_obj_id(SV* obj) {
- return HUF_id(obj, 0.0);
+ SV *item = SvRV(obj);
+ MAGIC *mg;
+ SV *id;
+
+ /* Get cached object ID, if it exists */
+ if (SvTYPE(item) >= SVt_PVMG) {
+ for ( mg = SvMAGIC(item); mg; mg = mg->mg_moremagic ) {
+ if ((mg->mg_type == PERL_MAGIC_ext) &&
+ (mg->mg_private == HUF_IDCACHE)
+ ) {
+ return mg->mg_obj;
+ }
+ }
+ }
+
+ /* Create an object ID, cache it */
+ id = HUF_OBJ_ID(item);
+ mg = sv_magicext(item, id, PERL_MAGIC_ext, NULL, NULL, 0);
+ mg->mg_private = HUF_IDCACHE;
+
+ /* Return the object ID */
+ return id;
}
/* set up uvar magic for any sv */
}
/* make it safe in case we must run in global clenaup, after all */
if (PL_in_clean_all)
- HUF_global(HUF_RESET);
+ HUF_global(HUF_RESET); /* shoudn't be needed */
hv_delete_ent(MY_CXT.ob_reg, ob_id, G_DISCARD, 0);
}
return 0;
}
-/* Create a trigger for an object. The trigger is a magical weak ref
- * that fires when the weak ref expires. it holds the original id of
- * the object, and a list of field hashes from which the object may
- * have to be deleted. The trigger is stored in the object registry
- * and also deleted when the object expires.
+/* Create a trigger for an object. The trigger is a magical SV
+ * that holds a weak ref to the object. The magic fires when the object
+ * expires and takes care of garbage collection in registred hashes.
+ * For that purpose, the magic structure holds the original id of
+ * the object, and a list (a hash, really) of hashes from which the
+ * object may * have to be deleted. The trigger is stored in the
+ * object registry and is also deleted when the object expires.
*/
SV* HUF_new_trigger(SV* obj, SV* ob_id) {
dMY_CXT;
}
/* get the trigger for an object, creating it if necessary */
-SV* HUF_get_trigger(SV* obj, SV* ob_id) {
+SV* HUF_get_trigger0(SV* obj, SV* ob_id) {
SV* trigger;
if (!(trigger = HUF_ask_trigger(ob_id)))
trigger = HUF_new_trigger(obj, ob_id);
return trigger;
}
-/* mark an object (trigger) as having been used with a field */
+SV* HUF_get_trigger(SV* obj, SV* ob_id) {
+ SV* trigger = HUF_ask_trigger(ob_id);
+ if (!trigger)
+ trigger = HUF_new_trigger(obj, ob_id);
+ return( trigger);
+}
+
+/* mark an object (trigger) as having been used with a field
+ (a clenup-liability)
+*/
void HUF_mark_field(SV* trigger, SV* field) {
AV* cont = HUF_get_trigger_content(trigger);
HV* field_tab = (HV*) *av_fetch(cont, 1, 0);
SV* field_ref = newRV_inc(field);
- SV* field_id = HUF_field_id(field_ref);
- hv_store_ent(field_tab, field_id, field_ref, 0);
+ UV field_addr = PTR2UV(field);
+ hv_store(field_tab, (char *)&field_addr, sizeof(field_addr), field_ref, 0);
}
-/* These constants are not in the API. If they ever change in hv.c this code
- * must be updated */
-#define HV_FETCH_ISSTORE 0x01
-#define HV_FETCH_ISEXISTS 0x02
-#define HV_FETCH_LVALUE 0x04
-#define HV_FETCH_JUST_SV 0x08
+/* Determine, from the value of action, whether this call may create a new
+ * hash key */
+#define HUF_WOULD_CREATE_KEY(x) ((x) != HV_DELETE && ((x) & (HV_FETCH_ISSTORE | HV_FETCH_LVALUE)))
-#define HUF_WOULD_CREATE_KEY(x) ((x) != -1 && ((x) & (HV_FETCH_ISSTORE | HV_FETCH_LVALUE)))
-
-/* The key exchange function. It communicates with S_hv_magic_uvar_xkey
+/* The key exchange functions. They communicate with S_hv_magic_uvar_xkey
* in hv.c */
-I32 HUF_watch_key(pTHX_ IV action, SV* field) {
+I32 HUF_watch_key_safe(pTHX_ IV action, SV* field) {
MAGIC* mg = mg_find(field, PERL_MAGIC_uvar);
SV* keysv;
- if (mg) {
- keysv = mg->mg_obj;
- if (keysv && SvROK(keysv)) {
+ if (mg && (keysv = mg->mg_obj)) {
+ if (SvROK(keysv)) { /* ref key */
SV* ob_id = HUF_obj_id(keysv);
mg->mg_obj = ob_id; /* key replacement */
if (HUF_WOULD_CREATE_KEY(action)) {
SV* trigger = HUF_get_trigger(keysv, ob_id);
HUF_mark_field(trigger, field);
}
+ } else if (HUF_WOULD_CREATE_KEY(action)) { /* string key */
+ /* registered as object id? */
+ SV* trigger;
+ if ( trigger = HUF_ask_trigger(keysv))
+ HUF_mark_field( trigger, field);
}
} else {
- Perl_die(aTHX_ "Rogue call of 'HUF_watch_key'");
+ Perl_die(aTHX_ "Rogue call of 'HUF_watch_key_safe'");
+ }
+ return 0;
+}
+
+I32 HUF_watch_key_id(pTHX_ IV action, SV* field) {
+ MAGIC* mg = mg_find(field, PERL_MAGIC_uvar);
+ SV* keysv;
+ if (mg && (keysv = mg->mg_obj)) {
+ if (SvROK(keysv)) /* ref key */
+ mg->mg_obj = HUF_obj_id(keysv); /* key replacement */
+ } else {
+ Perl_die(aTHX_ "Rogue call of 'HUF_watch_key_id'");
}
return 0;
}
if (hash && (SvTYPE(hash) == SVt_PVHV)) {
MAGIC* mg;
struct ufuncs* uf;
- ans = (mg = mg_find((SV*)hash, PERL_MAGIC_uvar)) &&
+ if ((mg = mg_find((SV*)hash, PERL_MAGIC_uvar)) &&
(uf = (struct ufuncs *)mg->mg_ptr) &&
- (uf->uf_val == &HUF_watch_key) &&
- (uf->uf_set == NULL);
+ (uf->uf_set == NULL)
+ ) {
+ ans = HUF_func_2mode(uf->uf_val);
+ }
}
return ans;
}
+int HUF_func_2mode( I32(* val)(pTHX_ IV, SV*)) {
+ int ans = 0;
+ if (val == &HUF_watch_key_id)
+ ans = 1;
+ if (val == &HUF_watch_key_safe)
+ ans = 2;
+ return(ans);
+}
+
+I32(* HUF_mode_2func( int mode))(pTHX_ IV, SV*) {
+ I32(* ans)(pTHX_ IV, SV*) = NULL;
+ switch (mode) {
+ case 1:
+ ans = &HUF_watch_key_id;
+ break;
+ case 2:
+ ans = &HUF_watch_key_safe;
+ break;
+ }
+ return(ans);
+}
+
/* Thread support. These routines are called by CLONE (and nothing else) */
/* Fix entries for one object in all field hashes */
hv_iterinit(field_tab);
while (ent = hv_iternext(field_tab)) {
SV* field_ref = HeVAL(ent);
- SV* field_id = HUF_field_id(field_ref);
HV* field = (HV*)SvRV(field_ref);
+ UV field_addr = PTR2UV(field);
SV* val;
/* recreate field tab entry */
- hv_store_ent(new_tab, field_id, SvREFCNT_inc(field_ref), 0);
+ hv_store(new_tab, (char *)&field_addr, sizeof(field_addr), SvREFCNT_inc(field_ref), 0);
/* recreate field entry, if any */
if (val = hv_delete_ent(field, old_id, 0, 0))
hv_store_ent(field, new_id, SvREFCNT_inc(val), 0);
for (i = 0; i <= len; ++i) {
SV* old_id = *av_fetch(oblist, i, 0);
SV* trigger = hv_delete_ent(MY_CXT.ob_reg, old_id, 0, 0);
- SV* new_id = HUF_obj_id(trigger);
+ SV* obj = SvRV(trigger);
+ MAGIC *mg;
+
+ SV* new_id = HUF_OBJ_ID(obj);
+
+ /* Replace cached object ID with this new one */
+ for (mg = SvMAGIC(obj); mg; mg = mg->mg_moremagic) {
+ if ((mg->mg_type == PERL_MAGIC_ext) &&
+ (mg->mg_private == HUF_IDCACHE)
+ ) {
+ mg->mg_obj = new_id;
+ }
+ }
+
HUF_fix_trigger(trigger, new_id);
hv_store_ent(MY_CXT.ob_reg, new_id, SvREFCNT_inc(trigger), 0);
}
(field = (HV*)SvRV(href)) &&
SvTYPE(field) == SVt_PVHV
) {
+
HUF_add_uvar_magic(
SvRV(href),
- &HUF_watch_key,
+ HUF_mode_2func( mode),
NULL,
0,
NULL
RETVAL
void
+id(SV* ref)
+PPCODE:
+ if (SvROK(ref)) {
+ XPUSHs(HUF_obj_id(ref));
+ } else {
+ XPUSHs(ref);
+ }
+
+SV*
+id_2obj(SV* id)
+PROTOTYPE: $
+CODE:
+ SV* obj = HUF_ask_trigger(id);
+ if (obj) {
+ RETVAL = newRV_inc(SvRV(obj));
+ } else {
+ RETVAL = &PL_sv_undef;
+ }
+OUTPUT:
+ RETVAL
+
+SV*
+register(SV* obj, ...)
+PROTOTYPE: $@
+CODE:
+ SV* trigger;
+ int i;
+ RETVAL = NULL;
+ if (!SvROK(obj)) {
+ Perl_die(aTHX_ "Attempt to register a non-ref");
+ } else {
+ RETVAL = newRV_inc(SvRV(obj));
+ }
+ trigger = HUF_get_trigger(obj, HUF_obj_id(obj));
+ for (i = 1; i < items; ++ i) {
+ SV* field_ref = POPs;
+ if (SvROK(field_ref) && (SvTYPE(SvRV(field_ref)) == SVt_PVHV)) {
+ HUF_mark_field(trigger, SvRV(field_ref));
+ }
+ }
+OUTPUT:
+ RETVAL
+
+void
CLONE(char* classname)
CODE:
if (0 == strcmp(classname, "Hash::Util::FieldHash")) {
projects / p5sagit/p5-mst-13.2.git / blobdiff