[rfc;rfa:breakpoint] Pass full breakpoint/watchpoint count to target

[Andrew Cagney]

> On Sun, 29 Sep 2002, Andrew Cagney wrote:
> 
> 
>> The attached patch changes the target vector so that a count of each 
>> type of hardware watchpoint/breakpoint is passed to the 
>> target_can_use_hardware_breakpoints() function. (Anyone got a better 
>> name for the function?).
>> 
>> This lets targets make a better guess at how many watchpoints are going 
>> to be needed.
> 
> 
> Sorry, I don't see the large-scale picture: how will this facility be 
> used in routine GDB operations by the application-level GDB code?
> 
> Also, on a i386, for example, if you don't pass the size and alignment of 
> each address to be watched, the guess of the amount of required resources 
> can be very wrong.  This is even more exacerbated due to debug register 
> sharing implemented for i386.

Yes, see my reply to the other e-mail.  I think we can do slightly 
better with the current model.  However, to make things optimal we'll 
need to totally overhaul things.

>> The intent is for the Z? packet to pass these totals down 
>> to the target.
> 
> 
> Do you mean to say this is only for remote targets?

Other architectures can use the info.  Its just that remote will be first.

Andrew