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Change the declaration of struct varlena so that the length word is

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represented as "char ...[4]" not "int32".  Since the length word is never
supposed to be accessed via this struct member anyway, this won't break
any existing code that is following the rules.  The advantage is that C
compilers will no longer assume that a pointer to struct varlena is
word-aligned, which prevents incorrect optimizations in TOAST-pointer
access and perhaps other places.  gcc doesn't seem to do this (at least
not at -O2), but the problem is demonstrable on some other compilers.

I changed struct inet as well, but didn't bother to touch a lot of other
struct definitions in which it wouldn't make any difference because there
were other fields forcing int alignment anyway.  Hopefully none of those
struct definitions are used for accessing unaligned Datums.
This commit is contained in:
Tom Lane
2008-02-23 19:11:45 +00:00
parent 870993e871
commit 9713c06319
4 changed files with 29 additions and 14 deletions
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5
src/backend/access/heap/tuptoaster.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/heap/tuptoaster.c,v 1.81 2008/01/01 19:45:46 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/heap/tuptoaster.c,v 1.82 2008/02/23 19:11:45 tgl Exp $
*
*
* INTERFACE ROUTINES
@ -65,7 +65,8 @@
#define VARATT_EXTERNAL_GET_POINTER(toast_pointer, attr) \
do { \
varattrib_1b_e *attre = (varattrib_1b_e *) (attr); \
Assert(VARSIZE_ANY_EXHDR(attre) == sizeof(toast_pointer)); \
Assert(VARATT_IS_EXTERNAL(attre)); \
Assert(VARSIZE_EXTERNAL(attre) == sizeof(toast_pointer) + VARHDRSZ_EXTERNAL); \
memcpy(&(toast_pointer), VARDATA_EXTERNAL(attre), sizeof(toast_pointer)); \
} while (0)