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Modify readfuncs so that recursive use of stringToNode will not crash

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and burn.  Just for added luck, change reading of CONST nodes so that
we do not need to consult pg_type rows while reading them; this means
that no database access occurs during stringToNode.  This requires
changing the order in which const-node fields are written, which means
an initdb is forced.
This commit is contained in:
Tom Lane
2001-01-07 01:08:48 +00:00
parent 1402201463
commit 4057b64f32
5 changed files with 438 additions and 459 deletions
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57
src/backend/nodes/outfuncs.c
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@ -1,48 +1,33 @@
/*
*
* outfuncs.c
* routines to convert a node to ascii representation
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.135 2000/12/03 20:45:33 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.136 2001/01/07 01:08:47 tgl Exp $
*
* NOTES
* Every (plan) node in POSTGRES has an associated "out" routine which
* knows how to create its ascii representation. These functions are
* useful for debugging as well as for storing plans in the system
* catalogs (eg. indexes). This is also the plan string sent out in
* Mariposa.
*
* These functions update the in/out argument of type StringInfo
* passed to them. This argument contains the string holding the ASCII
* representation plus some other information (string length, etc.)
*
* catalogs (eg. views).
*/
#include "postgres.h"
#include <ctype.h>
#include "access/heapam.h"
#include "access/htup.h"
#include "catalog/pg_type.h"
#include "fmgr.h"
#include "lib/stringinfo.h"
#include "nodes/execnodes.h"
#include "nodes/nodes.h"
#include "nodes/parsenodes.h"
#include "nodes/pg_list.h"
#include "nodes/plannodes.h"
#include "nodes/primnodes.h"
#include "nodes/relation.h"
#include "parser/parse.h"
#include "utils/datum.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
static void _outDatum(StringInfo str, Datum value, Oid type);
static void _outDatum(StringInfo str, Datum value, int typlen, bool typbyval);
static void _outNode(StringInfo str, void *obj);
/*
@ -63,8 +48,8 @@ _outToken(StringInfo str, char *s)
/*
* Look for characters or patterns that are treated specially by
* read.c (either in lsptok() or in nodeRead()), and therefore need a
* protective backslash.
* read.c (either in pg_strtok() or in nodeRead()), and therefore need
* a protective backslash.
*/
/* These characters only need to be quoted at the start of the string */
if (*s == '<' ||
@ -762,18 +747,17 @@ static void
_outConst(StringInfo str, Const *node)
{
appendStringInfo(str,
" CONST :consttype %u :constlen %d :constisnull %s :constvalue ",
" CONST :consttype %u :constlen %d :constbyval %s"
" :constisnull %s :constvalue ",
node->consttype,
node->constlen,
node->constbyval ? "true" : "false",
node->constisnull ? "true" : "false");
if (node->constisnull)
appendStringInfo(str, "<>");
else
_outDatum(str, node->constvalue, node->consttype);
appendStringInfo(str, " :constbyval %s ",
node->constbyval ? "true" : "false");
_outDatum(str, node->constvalue, node->constlen, node->constbyval);
}
/*
@ -1234,38 +1218,31 @@ _outJoinInfo(StringInfo str, JoinInfo *node)
* Print the value of a Datum given its type.
*/
static void
_outDatum(StringInfo str, Datum value, Oid type)
_outDatum(StringInfo str, Datum value, int typlen, bool typbyval)
{
int16 typeLength;
bool byValue;
Size length;
Size length,
i;
char *s;
int i;
/*
* find some information about the type and the "real" length of the
* datum.
*/
get_typlenbyval(type, &typeLength, &byValue);
length = datumGetSize(value, byValue, typeLength);
length = datumGetSize(value, typbyval, typlen);
if (byValue)
if (typbyval)
{
s = (char *) (&value);
appendStringInfo(str, " %u [ ", (unsigned int) length);
for (i = 0; i < (int) sizeof(Datum); i++)
for (i = 0; i < (Size) sizeof(Datum); i++)
appendStringInfo(str, "%d ", (int) (s[i]));
appendStringInfo(str, "] ");
}
else
{ /* !byValue */
{
s = (char *) DatumGetPointer(value);
if (!PointerIsValid(s))
appendStringInfo(str, " 0 [ ] ");
else
{
appendStringInfo(str, " %u [ ", (unsigned int) length);
for (i = 0; i < (int) length; i++)
for (i = 0; i < length; i++)
appendStringInfo(str, "%d ", (int) (s[i]));
appendStringInfo(str, "] ");
}