/*
- * Cache mechanism for collation information.
- *
- * Note that we currently lack any way to flush the cache. Since we don't
- * support ALTER COLLATION, this is OK. The worst case is that someone
- * drops a collation, and a useless cache entry hangs around in existing
- * backends.
+ * Create a new pg_locale_t struct for the given collation oid.
*/
-static collation_cache_entry *
-lookup_collation_cache(Oid collation)
+static pg_locale_t
+create_pg_locale(Oid collid, MemoryContext context)
{
- collation_cache_entry *cache_entry;
- bool found;
+ HeapTuple tp;
+ Form_pg_collation collform;
+ pg_locale_t result;
+ Datum datum;
+ bool isnull;
- Assert(OidIsValid(collation));
- Assert(collation != DEFAULT_COLLATION_OID);
+ result = MemoryContextAllocZero(context, sizeof(struct pg_locale_struct));
- if (CollationCache == NULL)
+ tp = SearchSysCache1(COLLOID, ObjectIdGetDatum(collid));
+ if (!HeapTupleIsValid(tp))
+ elog(ERROR, "cache lookup failed for collation %u", collid);
+ collform = (Form_pg_collation) GETSTRUCT(tp);
+
+ result->provider = collform->collprovider;
+ result->deterministic = collform->collisdeterministic;
+
+ if (collform->collprovider == COLLPROVIDER_BUILTIN)
{
- CollationCacheContext = AllocSetContextCreate(TopMemoryContext,
- "collation cache",
- ALLOCSET_DEFAULT_SIZES);
- CollationCache = collation_cache_create(CollationCacheContext,
- 16, NULL);
+ const char *locstr;
+
+ datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_colllocale);
+ locstr = TextDatumGetCString(datum);
+
+ result->collate_is_c = true;
+ result->ctype_is_c = (strcmp(locstr, "C") == 0);
+
+ builtin_validate_locale(GetDatabaseEncoding(), locstr);
+
+ result->info.builtin.locale = MemoryContextStrdup(context,
+ locstr);
}
+ else if (collform->collprovider == COLLPROVIDER_ICU)
+ {
+#ifdef USE_ICU
+ const char *iculocstr;
+ const char *icurules;
- cache_entry = collation_cache_insert(CollationCache, collation, &found);
- if (!found)
+ datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_colllocale);
+ iculocstr = TextDatumGetCString(datum);
+
+ result->collate_is_c = false;
+ result->ctype_is_c = false;
+
+ datum = SysCacheGetAttr(COLLOID, tp, Anum_pg_collation_collicurules, &isnull);
+ if (!isnull)
+ icurules = TextDatumGetCString(datum);
+ else
+ icurules = NULL;
+
+ result->info.icu.locale = MemoryContextStrdup(context, iculocstr);
+ result->info.icu.ucol = make_icu_collator(iculocstr, icurules);
+#else
+ /* could get here if a collation was created by a build with ICU */
+ ereport(ERROR,
+ (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+ errmsg("ICU is not supported in this build")));
+#endif
+ }
+ else if (collform->collprovider == COLLPROVIDER_LIBC)
{
- /*
- * Make sure cache entry is marked invalid, in case we fail before
- * setting things.
- */
- cache_entry->locale = 0;
+ const char *collcollate;
+ const char *collctype;
+
+ datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_collcollate);
+ collcollate = TextDatumGetCString(datum);
+ datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_collctype);
+ collctype = TextDatumGetCString(datum);
+
+ result->collate_is_c = (strcmp(collcollate, "C") == 0) ||
+ (strcmp(collcollate, "POSIX") == 0);
+ result->ctype_is_c = (strcmp(collctype, "C") == 0) ||
+ (strcmp(collctype, "POSIX") == 0);
+
+ result->info.lt = make_libc_collator(collcollate, collctype);
+ }
+ else
+ /* shouldn't happen */
+ PGLOCALE_SUPPORT_ERROR(collform->collprovider);
+
+ datum = SysCacheGetAttr(COLLOID, tp, Anum_pg_collation_collversion,
+ &isnull);
+ if (!isnull)
+ {
+ char *actual_versionstr;
+ char *collversionstr;
+
+ collversionstr = TextDatumGetCString(datum);
+
+ if (collform->collprovider == COLLPROVIDER_LIBC)
+ datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_collcollate);
+ else
+ datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_colllocale);
+
+ actual_versionstr = get_collation_actual_version(collform->collprovider,
+ TextDatumGetCString(datum));
+ if (!actual_versionstr)
+ {
+ /*
+ * This could happen when specifying a version in CREATE COLLATION
+ * but the provider does not support versioning, or manually
+ * creating a mess in the catalogs.
+ */
+ ereport(ERROR,
+ (errmsg("collation \"%s\" has no actual version, but a version was recorded",
+ NameStr(collform->collname))));
+ }
+
+ if (strcmp(actual_versionstr, collversionstr) != 0)
+ ereport(WARNING,
+ (errmsg("collation \"%s\" has version mismatch",
+ NameStr(collform->collname)),
+ errdetail("The collation in the database was created using version %s, "
+ "but the operating system provides version %s.",
+ collversionstr, actual_versionstr),
+ errhint("Rebuild all objects affected by this collation and run "
+ "ALTER COLLATION %s REFRESH VERSION, "
+ "or build PostgreSQL with the right library version.",
+ quote_qualified_identifier(get_namespace_name(collform->collnamespace),
+ NameStr(collform->collname)))));
}
- return cache_entry;
+ ReleaseSysCache(tp);
+
+ return result;
}
/*
pg_newlocale_from_collation(Oid collid)
{
collation_cache_entry *cache_entry;
+ bool found;
if (collid == DEFAULT_COLLATION_OID)
return &default_locale;
if (last_collation_cache_oid == collid)
return last_collation_cache_locale;
- cache_entry = lookup_collation_cache(collid);
-
- if (cache_entry->locale == 0)
+ if (CollationCache == NULL)
{
- /* We haven't computed this yet in this session, so do it */
- HeapTuple tp;
- Form_pg_collation collform;
- struct pg_locale_struct result;
- pg_locale_t resultp;
- Datum datum;
- bool isnull;
-
- tp = SearchSysCache1(COLLOID, ObjectIdGetDatum(collid));
- if (!HeapTupleIsValid(tp))
- elog(ERROR, "cache lookup failed for collation %u", collid);
- collform = (Form_pg_collation) GETSTRUCT(tp);
-
- /* We'll fill in the result struct locally before allocating memory */
- memset(&result, 0, sizeof(result));
- result.provider = collform->collprovider;
- result.deterministic = collform->collisdeterministic;
-
- if (collform->collprovider == COLLPROVIDER_BUILTIN)
- {
- const char *locstr;
-
- datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_colllocale);
- locstr = TextDatumGetCString(datum);
-
- result.collate_is_c = true;
- result.ctype_is_c = (strcmp(locstr, "C") == 0);
-
- builtin_validate_locale(GetDatabaseEncoding(), locstr);
-
- result.info.builtin.locale = MemoryContextStrdup(TopMemoryContext,
- locstr);
- }
- else if (collform->collprovider == COLLPROVIDER_ICU)
- {
-#ifdef USE_ICU
- const char *iculocstr;
- const char *icurules;
-
- datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_colllocale);
- iculocstr = TextDatumGetCString(datum);
-
- result.collate_is_c = false;
- result.ctype_is_c = false;
-
- datum = SysCacheGetAttr(COLLOID, tp, Anum_pg_collation_collicurules, &isnull);
- if (!isnull)
- icurules = TextDatumGetCString(datum);
- else
- icurules = NULL;
-
- result.info.icu.locale = MemoryContextStrdup(TopMemoryContext, iculocstr);
- result.info.icu.ucol = make_icu_collator(iculocstr, icurules);
-#else
- /* could get here if a collation was created by a build with ICU */
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("ICU is not supported in this build")));
-#endif
- }
- else if (collform->collprovider == COLLPROVIDER_LIBC)
- {
- const char *collcollate;
- const char *collctype;
-
- datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_collcollate);
- collcollate = TextDatumGetCString(datum);
- datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_collctype);
- collctype = TextDatumGetCString(datum);
-
- result.collate_is_c = (strcmp(collcollate, "C") == 0) ||
- (strcmp(collcollate, "POSIX") == 0);
- result.ctype_is_c = (strcmp(collctype, "C") == 0) ||
- (strcmp(collctype, "POSIX") == 0);
-
- result.info.lt = make_libc_collator(collcollate, collctype);
- }
- else
- /* shouldn't happen */
- PGLOCALE_SUPPORT_ERROR(collform->collprovider);
-
- datum = SysCacheGetAttr(COLLOID, tp, Anum_pg_collation_collversion,
- &isnull);
- if (!isnull)
- {
- char *actual_versionstr;
- char *collversionstr;
-
- collversionstr = TextDatumGetCString(datum);
-
- if (collform->collprovider == COLLPROVIDER_LIBC)
- datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_collcollate);
- else
- datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_colllocale);
-
- actual_versionstr = get_collation_actual_version(collform->collprovider,
- TextDatumGetCString(datum));
- if (!actual_versionstr)
- {
- /*
- * This could happen when specifying a version in CREATE
- * COLLATION but the provider does not support versioning, or
- * manually creating a mess in the catalogs.
- */
- ereport(ERROR,
- (errmsg("collation \"%s\" has no actual version, but a version was recorded",
- NameStr(collform->collname))));
- }
-
- if (strcmp(actual_versionstr, collversionstr) != 0)
- ereport(WARNING,
- (errmsg("collation \"%s\" has version mismatch",
- NameStr(collform->collname)),
- errdetail("The collation in the database was created using version %s, "
- "but the operating system provides version %s.",
- collversionstr, actual_versionstr),
- errhint("Rebuild all objects affected by this collation and run "
- "ALTER COLLATION %s REFRESH VERSION, "
- "or build PostgreSQL with the right library version.",
- quote_qualified_identifier(get_namespace_name(collform->collnamespace),
- NameStr(collform->collname)))));
- }
-
- ReleaseSysCache(tp);
+ CollationCacheContext = AllocSetContextCreate(TopMemoryContext,
+ "collation cache",
+ ALLOCSET_DEFAULT_SIZES);
+ CollationCache = collation_cache_create(CollationCacheContext,
+ 16, NULL);
+ }
- /* We'll keep the pg_locale_t structures in TopMemoryContext */
- resultp = MemoryContextAlloc(TopMemoryContext, sizeof(*resultp));
- *resultp = result;
+ cache_entry = collation_cache_insert(CollationCache, collid, &found);
+ if (!found)
+ {
+ /*
+ * Make sure cache entry is marked invalid, in case we fail before
+ * setting things.
+ */
+ cache_entry->locale = 0;
+ }
- cache_entry->locale = resultp;
+ if (cache_entry->locale == 0)
+ {
+ cache_entry->locale = create_pg_locale(collid, CollationCacheContext);
}
last_collation_cache_oid = collid;
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