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/*-------------------------------------------------------------------------
*
* htup.h
* POSTGRES heap tuple definitions.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: htup.h,v 1.25 1999/07/19 07:07:28 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef HTUP_H
#define HTUP_H
#include "storage/bufpage.h"
#define MinHeapTupleBitmapSize 32 /* 8 * 4 */
/* check these, they are likely to be more severely limited by t_hoff */
#define MaxHeapAttributeNumber 1600 /* 8 * 200 */
/*
* to avoid wasting space, the attributes should be layed out in such a
* way to reduce structure padding.
*/
typedef struct HeapTupleHeaderData
{
Oid t_oid; /* OID of this tuple -- 4 bytes */
CommandId t_cmin; /* insert CID stamp -- 4 bytes each */
CommandId t_cmax; /* delete CommandId stamp */
TransactionId t_xmin; /* insert XID stamp -- 4 bytes each */
TransactionId t_xmax; /* delete XID stamp */
ItemPointerData t_ctid; /* current TID of this or newer tuple */
int16 t_natts; /* number of attributes */
uint16 t_infomask; /* various infos */
uint8 t_hoff; /* sizeof tuple header */
bits8 t_bits[MinHeapTupleBitmapSize / 8];
/* bit map of domains */
/* MORE DATA FOLLOWS AT END OF STRUCT */
} HeapTupleHeaderData;
typedef HeapTupleHeaderData *HeapTupleHeader;
#define MinTupleSize (MAXALIGN(sizeof (PageHeaderData)) + \
MAXALIGN(sizeof(HeapTupleHeaderData)) + \
MAXALIGN(sizeof(char)))
#define MaxTupleSize (BLCKSZ - MinTupleSize)
#define MaxAttrSize (MaxTupleSize - MAXALIGN(sizeof(HeapTupleHeaderData)))
#define SelfItemPointerAttributeNumber (-1)
#define ObjectIdAttributeNumber (-2)
#define MinTransactionIdAttributeNumber (-3)
#define MinCommandIdAttributeNumber (-4)
#define MaxTransactionIdAttributeNumber (-5)
#define MaxCommandIdAttributeNumber (-6)
#define FirstLowInvalidHeapAttributeNumber (-7)
/* If you make any changes above, the order off offsets in this must change */
extern long heap_sysoffset[];
/*
* This new HeapTuple for version >= 6.5 and this is why it was changed:
*
* 1. t_len moved off on-disk tuple data - ItemIdData is used to get len;
* 2. t_ctid above is not self tuple TID now - it may point to
* updated version of tuple (required by MVCC);
* 3. someday someone let tuple to cross block boundaries -
* he have to add something below...
*/
typedef struct HeapTupleData
{
uint32 t_len; /* length of *t_data */
ItemPointerData t_self; /* SelfItemPointer */
HeapTupleHeader t_data; /* */
} HeapTupleData;
typedef HeapTupleData *HeapTuple;
#define HEAPTUPLESIZE MAXALIGN(sizeof(HeapTupleData))
/* ----------------
* support macros
* ----------------
*/
#define GETSTRUCT(TUP) (((char *)((HeapTuple)(TUP))->t_data) + \
((HeapTuple)(TUP))->t_data->t_hoff)
/*
* BITMAPLEN(NATTS) -
* Computes minimum size of bitmap given number of domains.
*/
#define BITMAPLEN(NATTS) \
((((((int)(NATTS) - 1) >> 3) + 4 - (MinHeapTupleBitmapSize >> 3)) \
& ~03) + (MinHeapTupleBitmapSize >> 3))
/*
* HeapTupleIsValid
* True iff the heap tuple is valid.
*/
#define HeapTupleIsValid(tuple) PointerIsValid(tuple)
/*
* information stored in t_infomask:
*/
#define HEAP_HASNULL 0x0001 /* has null attribute(s) */
#define HEAP_HASVARLENA 0x0002 /* has variable length
* attribute(s) */
#define HEAP_XMIN_COMMITTED 0x0100 /* t_xmin committed */
#define HEAP_XMIN_INVALID 0x0200 /* t_xmin invalid/aborted */
#define HEAP_XMAX_COMMITTED 0x0400 /* t_xmax committed */
#define HEAP_XMAX_INVALID 0x0800 /* t_xmax invalid/aborted */
#define HEAP_MARKED_FOR_UPDATE 0x1000 /* marked for UPDATE */
#define HEAP_UPDATED 0x2000 /* this is UPDATEd version of row */
#define HEAP_MOVED_OFF 0x4000 /* removed or moved to another
* place by vacuum */
#define HEAP_MOVED_IN 0x8000 /* moved from another place by
* vacuum */
#define HEAP_XACT_MASK 0xFF00 /* */
#define HeapTupleNoNulls(tuple) \
(!(((HeapTuple) (tuple))->t_data->t_infomask & HEAP_HASNULL))
#define HeapTupleAllFixed(tuple) \
(!(((HeapTuple) (tuple))->t_data->t_infomask & HEAP_HASVARLENA))
#endif /* HTUP_H */
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