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EcchiShell v1.0
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t_info & INDEX_SIZE_MASK))
#define IndexTupleDSize(itup) ((Size) ((itup).t_info & INDEX_SIZE_MASK))
#define IndexTupleHasNulls(itup) ((((IndexTuple) (itup))->t_info & INDEX_NULL_MASK))
#define IndexTupleHasVarwidths(itup) ((((IndexTuple) (itup))->t_info & INDEX_VAR_MASK))
/*
* Takes an infomask as argument (primarily because this needs to be usable
* at index_form_tuple time so enough space is allocated).
*/
#define IndexInfoFindDataOffset(t_info) \
( \
(!((t_info) & INDEX_NULL_MASK)) ? \
( \
(Size)MAXALIGN(sizeof(IndexTupleData)) \
) \
: \
( \
(Size)MAXALIGN(sizeof(IndexTupleData) + sizeof(IndexAttributeBitMapData)) \
) \
)
/* ----------------
* index_getattr
*
* This gets called many times, so we macro the cacheable and NULL
* lookups, and call nocache_index_getattr() for the rest.
*
* ----------------
*/
#define index_getattr(tup, attnum, tupleDesc, isnull) \
( \
AssertMacro(PointerIsValid(isnull) && (attnum) > 0), \
*(isnull) = false, \
!IndexTupleHasNulls(tup) ? \
( \
(tupleDesc)->attrs[(attnum)-1]->attcacheoff >= 0 ? \
( \
fetchatt((tupleDesc)->attrs[(attnum)-1], \
(char *) (tup) + IndexInfoFindDataOffset((tup)->t_info) \
+ (tupleDesc)->attrs[(attnum)-1]->attcacheoff) \
) \
: \
nocache_index_getattr((tup), (attnum), (tupleDesc)) \
) \
: \
( \
(att_isnull((attnum)-1, (char *)(tup) + sizeof(IndexTupleData))) ? \
( \
*(isnull) = true, \
(Datum)NULL \
) \
: \
( \
nocache_index_getattr((tup), (attnum), (tupleDesc)) \
) \
) \
)
/*
* MaxIndexTuplesPerPage is an upper bound on the number of tuples that can
* fit on one index page. An index tuple must have either data or a null
* bitmap, so we can safely assume it's at least 1 byte bigger than a bare
* IndexTupleData struct. We arrive at the divisor because each tuple
* must be maxaligned, and it must have an associated item pointer.
*/
#define MaxIndexTuplesPerPage \
((int) ((BLCKSZ - SizeOfPageHeaderData) / \
(MAXALIGN(sizeof(IndexTupleData) + 1) + sizeof(ItemIdData))))
/* routines in indextuple.c */
extern IndexTuple index_form_tuple(TupleDesc tupleDescriptor,
Datum *values, bool *isnull);
extern Datum nocache_index_getattr(IndexTuple tup, int attnum,
TupleDesc tupleDesc);
extern void index_deform_tuple(IndexTuple tup, TupleDesc tupleDescriptor,
Datum *values, bool *isnull);
extern IndexTuple CopyIndexTuple(IndexTuple source);
#endif /* ITUP_H */