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Use FLEXIBLE_ARRAY_MEMBER in a bunch more places.

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Replace some bogus "x[1]" declarations with "x[FLEXIBLE_ARRAY_MEMBER]".
Aside from being more self-documenting, this should help prevent bogus
warnings from static code analyzers and perhaps compiler misoptimizations.

This patch is just a down payment on eliminating the whole problem, but
it gets rid of a lot of easy-to-fix cases.

Note that the main problem with doing this is that one must no longer rely
on computing sizeof(the containing struct), since the result would be
compiler-dependent.  Instead use offsetof(struct, lastfield).  Autoconf
also warns against spelling that offsetof(struct, lastfield[0]).

Michael Paquier, review and additional fixes by me.
This commit is contained in:
Tom Lane
2015-02-20 00:11:42 -05:00
parent 2fb7a75f37
commit 09d8d110a6
44 changed files with 109 additions and 127 deletions
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4
contrib/intarray/_int.h
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@ -73,7 +73,7 @@ typedef struct
{
int32 vl_len_; /* varlena header (do not touch directly!) */
int32 flag;
char data[1];
char data[FLEXIBLE_ARRAY_MEMBER];
} GISTTYPE;
#define ALLISTRUE 0x04
@ -133,7 +133,7 @@ typedef struct QUERYTYPE
{
int32 vl_len_; /* varlena header (do not touch directly!) */
int32 size; /* number of ITEMs */
ITEM items[1]; /* variable length array */
ITEM items[FLEXIBLE_ARRAY_MEMBER];
} QUERYTYPE;
#define HDRSIZEQT offsetof(QUERYTYPE, items)