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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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2
src/include/access/heapam_xlog.h
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@ -132,7 +132,7 @@ typedef struct xl_heap_multi_insert
{
uint8 flags;
uint16 ntuples;
OffsetNumber offsets[1];
OffsetNumber offsets[FLEXIBLE_ARRAY_MEMBER];
} xl_heap_multi_insert;
#define SizeOfHeapMultiInsert offsetof(xl_heap_multi_insert, offsets)