[commit] new observer.[hc] files

[Andreas Schwab]

Daniel Jacobowitz <drow@mvista.com> writes:

|> Is this extra indirection really necessary?  Because I'm 99% sure it
|> won't work on several 64-bit platforms.  Function pointers and data
|> pointers are not required to have the same size; on IA-64 I believe
|> that a function pointer is 128 bits and a data pointer is 64 bits.

Function pointer are still 64 bits on ia64 (and ppc64).  They do not point
to the code itself, but to a descriptor which contains the actual code
pointer and the gp value.  But I agree that mixing function pointer and
object pointers should be avoided.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Deutschherrnstr. 15-19, D-90429 Nürnberg
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