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/*------------------------------------------------------------------------- * * typcache.h * Type cache definitions. * * The type cache exists to speed lookup of certain information about data * types that is not directly available from a type's pg_type row. * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/utils/typcache.h * *------------------------------------------------------------------------- */ #ifndef TYPCACHE_H #define TYPCACHE_H #include "access/tupdesc.h" #include "fmgr.h" /* DomainConstraintCache is an opaque struct known only within typcache.c */ typedef struct DomainConstraintCache DomainConstraintCache; /* TypeCacheEnumData is an opaque struct known only within typcache.c */ struct TypeCacheEnumData; typedef struct TypeCacheEntry { /* typeId is the hash lookup key and MUST BE FIRST */ Oid type_id; /* OID of the data type */ /* some subsidiary information copied from the pg_type row */ int16 typlen; bool typbyval; char typalign; char typstorage; char typtype; Oid typrelid; /* * Information obtained from opfamily entries * * These will be InvalidOid if no match could be found, or if the * information hasn't yet been requested. Also note that for array and * composite types, typcache.c checks that the contained types are * comparable or hashable before allowing eq_opr etc to become set. */ Oid btree_opf; /* the default btree opclass' family */ Oid btree_opintype; /* the default btree opclass' opcintype */ Oid hash_opf; /* the default hash opclass' family */ Oid hash_opintype; /* the default hash opclass' opcintype */ Oid eq_opr; /* the equality operator */ Oid lt_opr; /* the less-than operator */ Oid gt_opr; /* the greater-than operator */ Oid cmp_proc; /* the btree comparison function */ Oid hash_proc; /* the hash calculation function */ /* * Pre-set-up fmgr call info for the equality operator, the btree * comparison function, and the hash calculation function. These are kept * in the type cache to avoid problems with memory leaks in repeated calls * to functions such as array_eq, array_cmp, hash_array. There is not * currently a need to maintain call info for the lt_opr or gt_opr. */ FmgrInfo eq_opr_finfo; FmgrInfo cmp_proc_finfo; FmgrInfo hash_proc_finfo; /* * Tuple descriptor if it's a composite type (row type). NULL if not * composite or information hasn't yet been requested. (NOTE: this is a * reference-counted tupledesc.) */ TupleDesc tupDesc; /* * Fields computed when TYPECACHE_RANGE_INFO is requested. Zeroes if not * a range type or information hasn't yet been requested. Note that * rng_cmp_proc_finfo could be different from the element type's default * btree comparison function. */ struct TypeCacheEntry *rngelemtype; /* range's element type */ Oid rng_collation; /* collation for comparisons, if any */ FmgrInfo rng_cmp_proc_finfo; /* comparison function */ FmgrInfo rng_canonical_finfo; /* canonicalization function, if any */ FmgrInfo rng_subdiff_finfo; /* difference function, if any */ /* * Domain constraint data if it's a domain type. NULL if not domain, or * if domain has no constraints, or if information hasn't been requested. */ DomainConstraintCache *domainData; /* Private data, for internal use of typcache.c only */ int flags; /* flags about what we've computed */ /* * Private information about an enum type. NULL if not enum or * information hasn't been requested. */ struct TypeCacheEnumData *enumData; /* We also maintain a list of all known domain-type cache entries */ struct TypeCacheEntry *nextDomain; } TypeCacheEntry; /* Bit flags to indicate which fields a given caller needs to have set */ #define TYPECACHE_EQ_OPR 0x0001 #define TYPECACHE_LT_OPR 0x0002 #define TYPECACHE_GT_OPR 0x0004 #define TYPECACHE_CMP_PROC 0x0008 #define TYPECACHE_HASH_PROC 0x0010 #define TYPECACHE_EQ_OPR_FINFO 0x0020 #define TYPECACHE_CMP_PROC_FINFO 0x0040 #define TYPECACHE_HASH_PROC_FINFO 0x0080 #define TYPECACHE_TUPDESC 0x0100 #define TYPECACHE_BTREE_OPFAMILY 0x0200 #define TYPECACHE_HASH_OPFAMILY 0x0400 #define TYPECACHE_RANGE_INFO 0x0800 #define TYPECACHE_DOMAIN_INFO 0x1000 /* * Callers wishing to maintain a long-lived reference to a domain's constraint * set must store it in one of these. Use InitDomainConstraintRef() and * UpdateDomainConstraintRef() to manage it. Note: DomainConstraintState is * considered an executable expression type, so it's defined in execnodes.h. */ typedef struct DomainConstraintRef { List *constraints; /* list of DomainConstraintState nodes */ MemoryContext refctx; /* context holding DomainConstraintRef */ TypeCacheEntry *tcache; /* typcache entry for domain type */ /* Management data --- treat these fields as private to typcache.c */ DomainConstraintCache *dcc; /* current constraints, or NULL if none */ MemoryContextCallback callback; /* used to release refcount when done */ } DomainConstraintRef; extern TypeCacheEntry *lookup_type_cache(Oid type_id, int flags); extern void InitDomainConstraintRef(Oid type_id, DomainConstraintRef *ref, MemoryContext refctx); extern void UpdateDomainConstraintRef(DomainConstraintRef *ref); extern bool DomainHasConstraints(Oid type_id); extern TupleDesc lookup_rowtype_tupdesc(Oid type_id, int32 typmod); extern TupleDesc lookup_rowtype_tupdesc_noerror(Oid type_id, int32 typmod, bool noError); extern TupleDesc lookup_rowtype_tupdesc_copy(Oid type_id, int32 typmod); extern void assign_record_type_typmod(TupleDesc tupDesc); extern int compare_values_of_enum(TypeCacheEntry *tcache, Oid arg1, Oid arg2); #endif /* TYPCACHE_H */