[ Forgot the list. ]
2011/5/12, Yves Weißig <weissig@rbg.informatik.tu-darmstadt.de>:
> I'm currently debugging my developed AM and are running into this problem:
>
> TRAP: FailedAssertion("!(((bool) (((void*)(tid) != ((void *)0)) &&
> ((tid)->ip_posid != 0))))", File: "indexam.c", Line: 488)
>
> Can anybody explain what it means? I'm having difficulties to understand
> what went wrong.
Just in case you are wondering about the details of the macro-expansion:
indexam.c:484:
/* Switch to correct buffer if we don't have it already */
prev_buf = scan->xs_cbuf;
scan->xs_cbuf = ReleaseAndReadBuffer(scan->xs_cbuf, scan->heapRelation,
ItemPointerGetBlockNumber(tid));
I.e., what you see is the expansion of ItemPointerGetBlockNumber,
which is (itemptr.h:69):
AssertMacro(ItemPointerIsValid(pointer)), \
BlockIdGetBlockNumber(&(pointer)->ip_blkid) \
ItemPointerIsValid is (itemptr.h:62):
((bool) (PointerIsValid(pointer) && ((pointer)->ip_posid != 0)))
I.e., ultimately the whole thing checks whether tid is non-null and
its ip_posid member is non-zero ("whether tid is a valid item
pointer").
I hope that helps you to figure out what happens in the context of
what you are doing.
Nicolas
--
A. Because it breaks the logical sequence of discussion.
Q. Why is top posting bad?
