Re: [RFC] Addition of remote tracepoints to gdb / gdbserver.

[Ramana Radhakrishnan <ramana dot radhakrishnan at codito dot com>]

Daniel Jacobowitz wrote:

> On Fri, Jan 02, 2004 at 03:56:18AM +0530, Ramana Radhakrishnan wrote:
>  
>
> > Now the remote side would have to understand the target floating point 
> > format / collect the values for
> > the same and hence the actual computation would have to be target 
> > specific .2 options
> > a. do all calculations in gdbserver
> > b. collect all byte sequences and take care of it in gdb.
> >
> > Option b seems less expensive.
> >    
>
> Yes, but sometimes it's not enough.  In the example I gave you'd have
> to do the memory reference at trace collection time.  But I don't
> think it's a real problem so option b is probably fine.
>  
It might be cheaper to take option b .,for FPU less architectures That 
could be another reason for sticking to option b.


Also regarding the AgentExpression code Generation problem that you 
mentioned in your earlier mail , the byte code generated for the 
following actions in the agent expressions is as
follows.

considering 2 globals i & j and we need to collect the value of i + j at 
some trace point.


trace someprogram point
collect i + j

code generated seems to be equivalent to the following


Aopconst32 &i
Aopref32
Aopconst32 &j
Aopref32
aopadd


(where aopconst32 )
and aopadd is addition .

which is consistent with the manual

cheers
Ramana