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Commit028e13b

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Tweak GiST code to work correctly on machines where 8-byte alignment
of pointers is required. Patch from Teodor Sigaev per pghackersdiscussion. It's an ugly kluge but avoids forcing initdb; we'll puta better fix into 7.3 or later.
1 parent2bd15ad commit028e13b

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1 file changed

+28
-14
lines changed

1 file changed

+28
-14
lines changed

‎src/backend/access/gist/gist.c‎

Lines changed: 28 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
* Portions Copyright (c) 1994, Regents of the University of California
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/access/gist/gist.c,v 1.87 2002/01/15 22:14:16 tgl Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/access/gist/gist.c,v 1.88 2002/02/11 22:41:59 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -659,6 +659,7 @@ gistunion(Relation r, IndexTuple *itvec, int len, GISTSTATE *giststate)
659659
Datumattr[INDEX_MAX_KEYS];
660660
boolwhatfree[INDEX_MAX_KEYS];
661661
charisnull[INDEX_MAX_KEYS];
662+
char*storage;
662663
bytea*evec;
663664
Datumdatum;
664665
intdatumsize,
@@ -671,7 +672,9 @@ gistunion(Relation r, IndexTuple *itvec, int len, GISTSTATE *giststate)
671672
intreallen;
672673

673674
needfree= (bool*)palloc(((len==1) ?2 :len)*sizeof(bool));
674-
evec= (bytea*)palloc(((len==1) ?2 :len)*sizeof(GISTENTRY)+VARHDRSZ);
675+
/* workaround for 64-bit: ensure GISTENTRY array is maxaligned */
676+
storage= (char*)palloc( ((len==1) ?2 :len)*sizeof(GISTENTRY)+MAXALIGN(VARHDRSZ));
677+
evec= (bytea*) (storage+MAXALIGN(VARHDRSZ)-VARHDRSZ);
675678

676679
for (j=0;j<r->rd_att->natts;j++)
677680
{
@@ -737,7 +740,7 @@ gistunion(Relation r, IndexTuple *itvec, int len, GISTSTATE *giststate)
737740
}
738741
}
739742

740-
pfree(evec);
743+
pfree(storage);/* pfree(evec); */
741744
pfree(needfree);
742745

743746
newtup= (IndexTuple)index_formtuple(giststate->tupdesc,attr,isnull);
@@ -772,11 +775,13 @@ gistgetadjusted(Relation r, IndexTuple oldtup, IndexTuple addtup, GISTSTATE *gis
772775
adddec[INDEX_MAX_KEYS];
773776
boololdisnull[INDEX_MAX_KEYS],
774777
addisnull[INDEX_MAX_KEYS];
775-
776778
IndexTuplenewtup=NULL;
779+
char*storage;
777780
intj;
778781

779-
evec= (bytea*)palloc(2*sizeof(GISTENTRY)+VARHDRSZ);
782+
/* workaround for 64-bit: ensure GISTENTRY array is maxaligned */
783+
storage= (char*)palloc(2*sizeof(GISTENTRY)+MAXALIGN(VARHDRSZ));
784+
evec= (bytea*) (storage+MAXALIGN(VARHDRSZ)-VARHDRSZ);
780785
VARATT_SIZEP(evec)=2*sizeof(GISTENTRY)+VARHDRSZ;
781786
ev0p=&((GISTENTRY*)VARDATA(evec))[0];
782787
ev1p=&((GISTENTRY*)VARDATA(evec))[1];
@@ -844,7 +849,7 @@ gistgetadjusted(Relation r, IndexTuple oldtup, IndexTuple addtup, GISTSTATE *gis
844849
whatfree[j]= FALSE;
845850
}
846851
}
847-
pfree(evec);
852+
pfree(storage);/* pfree(evec); */
848853

849854
if (neednew)
850855
{
@@ -873,6 +878,7 @@ gistunionsubkey(Relation r, GISTSTATE *giststate, IndexTuple *itvec, GIST_SPLITV
873878
*attrsize;
874879
OffsetNumber*entries;
875880
bytea*evec;
881+
char*storage;
876882
Datumdatum;
877883
intdatumsize;
878884
intreallen;
@@ -898,7 +904,10 @@ gistunionsubkey(Relation r, GISTSTATE *giststate, IndexTuple *itvec, GIST_SPLITV
898904
}
899905

900906
needfree= (bool*)palloc(((len==1) ?2 :len)*sizeof(bool));
901-
evec= (bytea*)palloc(((len==1) ?2 :len)*sizeof(GISTENTRY)+VARHDRSZ);
907+
/* workaround for 64-bit: ensure GISTENTRY array is maxaligned */
908+
storage= (char*)palloc( ((len==1) ?2 :len)*sizeof(GISTENTRY)+MAXALIGN(VARHDRSZ));
909+
evec= (bytea*) (storage+MAXALIGN(VARHDRSZ)-VARHDRSZ);
910+
902911
for (j=1;j<r->rd_att->natts;j++)
903912
{
904913
reallen=0;
@@ -958,7 +967,7 @@ gistunionsubkey(Relation r, GISTSTATE *giststate, IndexTuple *itvec, GIST_SPLITV
958967
attr[j]=datum;
959968
attrsize[j]=datumsize;
960969
}
961-
pfree(evec);
970+
pfree(storage);/* pfree(evec); */
962971
pfree(needfree);
963972
}
964973
}
@@ -1050,6 +1059,7 @@ gistadjsubkey(Relation r,
10501059
floatlpenalty,
10511060
rpenalty;
10521061
bytea*evec;
1062+
char*storage;
10531063
intdatumsize;
10541064
boolisnull[INDEX_MAX_KEYS];
10551065
inti,
@@ -1081,7 +1091,9 @@ gistadjsubkey(Relation r,
10811091
curlen--;
10821092
v->spl_nright=curlen;
10831093

1084-
evec= (bytea*)palloc(2*sizeof(GISTENTRY)+VARHDRSZ);
1094+
/* workaround for 64-bit: ensure GISTENTRY array is maxaligned */
1095+
storage= (char*)palloc(2*sizeof(GISTENTRY)+MAXALIGN(VARHDRSZ));
1096+
evec= (bytea*) (storage+MAXALIGN(VARHDRSZ)-VARHDRSZ);
10851097
VARATT_SIZEP(evec)=2*sizeof(GISTENTRY)+VARHDRSZ;
10861098
ev0p=&((GISTENTRY*)VARDATA(evec))[0];
10871099
ev1p=&((GISTENTRY*)VARDATA(evec))[1];
@@ -1189,7 +1201,7 @@ gistadjsubkey(Relation r,
11891201
}
11901202
gistFreeAtt(r,identry,decfree);
11911203
}
1192-
pfree(evec);
1204+
pfree(storage);/* pfree(evec); */
11931205
}
11941206

11951207
/*
@@ -1216,6 +1228,7 @@ gistSplit(Relation r,
12161228
GISTPageOpaqueopaque;
12171229
GIST_SPLITVECv;
12181230
bytea*entryvec;
1231+
char*storage;
12191232
bool*decompvec;
12201233
inti,
12211234
j,
@@ -1227,7 +1240,6 @@ gistSplit(Relation r,
12271240
p= (Page)BufferGetPage(buffer);
12281241
opaque= (GISTPageOpaque)PageGetSpecialPointer(p);
12291242

1230-
12311243
/*
12321244
* The root of the tree is the first block in the relation. If we're
12331245
* about to split the root, we need to do some hocus-pocus to enforce
@@ -1255,8 +1267,10 @@ gistSplit(Relation r,
12551267
right= (Page)BufferGetPage(rightbuf);
12561268

12571269
/* generate the item array */
1258-
entryvec= (bytea*)palloc(VARHDRSZ+ (*len+1)*sizeof(GISTENTRY));
1259-
decompvec= (bool*)palloc(VARHDRSZ+ (*len+1)*sizeof(bool));
1270+
/* workaround for 64-bit: ensure GISTENTRY array is maxaligned */
1271+
storage=palloc(MAXALIGN(VARHDRSZ)+ (*len+1)*sizeof(GISTENTRY));
1272+
entryvec= (bytea*) (storage+MAXALIGN(VARHDRSZ)-VARHDRSZ);
1273+
decompvec= (bool*)palloc( (*len+1)*sizeof(bool));
12601274
VARATT_SIZEP(entryvec)= (*len+1)*sizeof(GISTENTRY)+VARHDRSZ;
12611275
for (i=1;i <=*len;i++)
12621276
{
@@ -1322,7 +1336,7 @@ gistSplit(Relation r,
13221336
for (i=1;i <=*len;i++)
13231337
if (decompvec[i])
13241338
pfree(DatumGetPointer(((GISTENTRY*)VARDATA(entryvec))[i].key));
1325-
pfree(entryvec);
1339+
pfree(storage);/* pfree(entryvec); */
13261340
pfree(decompvec);
13271341

13281342
/* form left and right vector */

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