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First stage of reclaiming memory in executor by resetting short-term

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memory contexts.  Currently, only leaks in expressions executed as
quals or projections are handled.  Clean up some old dead cruft in
executor while at it --- unused fields in state nodes, that sort of thing.
This commit is contained in:
Tom Lane
2000-07-12 02:37:39 +00:00
parent 46fb9c29e2
commit badce86a2c
53 changed files with 1536 additions and 1584 deletions
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65
src/include/utils/datum.h
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@@ -1,64 +1,49 @@
/*-------------------------------------------------------------------------
*
* datum.h
* POSTGRES abstract data type datum representation definitions.
* POSTGRES Datum (abstract data type) manipulation routines.
*
* These routines are driven by the 'typbyval' and 'typlen' information,
* which must previously have been obtained by the caller for the datatype
* of the Datum. (We do it this way because in most situations the caller
* can look up the info just once and use it for many per-datum operations.)
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: datum.h,v 1.10 2000/01/26 05:58:37 momjian Exp $
* $Id: datum.h,v 1.11 2000/07/12 02:37:35 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef DATUM_H
#define DATUM_H
/*
* datumGetSize - find the "real" length of a datum
*/
extern Size datumGetSize(Datum value, bool typByVal, int typLen);
/*--------------------------------------------------------
* SOME NOT VERY PORTABLE ROUTINES ???
*--------------------------------------------------------
/*
* datumCopy - make a copy of a datum.
*
* In the implementation of the next routines we assume the following:
* If the datatype is pass-by-reference, memory is obtained with palloc().
*/
extern Datum datumCopy(Datum value, bool typByVal, int typLen);
/*
* datumFree - free a datum previously allocated by datumCopy, if any.
*
* A) if a type is "byVal" then all the information is stored in the
* Datum itself (i.e. no pointers involved!). In this case the
* length of the type is always greater than zero and less than
* "sizeof(Datum)"
* B) if a type is not "byVal" and it has a fixed length, then
* the "Datum" always contain a pointer to a stream of bytes.
* The number of significant bytes are always equal to the length of thr
* type.
* C) if a type is not "byVal" and is of variable length (i.e. it has
* length == -1) then "Datum" always points to a "struct varlena".
* This varlena structure has information about the actual length of this
* particular instance of the type and about its value.
* Does nothing if datatype is pass-by-value.
*/
extern void datumFree(Datum value, bool typByVal, int typLen);
/*---------------
* datumGetSize
* find the "real" length of a datum
*/
extern Size datumGetSize(Datum value, Oid type, bool byVal, Size len);
/*---------------
* datumCopy
* make a copy of a datum.
*/
extern Datum datumCopy(Datum value, Oid type, bool byVal, Size len);
/*---------------
* datumFree
* free space that *might* have been palloced by "datumCopy"
*/
extern void datumFree(Datum value, Oid type, bool byVal, Size len);
/*---------------
/*
* datumIsEqual
* return true if thwo datums are equal, false otherwise.
* return true if two datums of the same type are equal, false otherwise.
*
* XXX : See comments in the code for restrictions!
*/
extern bool datumIsEqual(Datum value1, Datum value2, Oid type,
bool byVal, Size len);
extern bool datumIsEqual(Datum value1, Datum value2,
bool typByVal, int typLen);
#endif /* DATUM_H */