[RFA] Document fixed/floating variable objects and thread-id.

[Vladimir Prus]

On Thursday 10 April 2008 00:52:01 Eli Zaretskii wrote:
> > From: Vladimir Prus <ghost@cs.msu.su>
> > Date: Wed, 9 Apr 2008 21:47:35 +0400
> > Cc: gdb-patches@sources.redhat.com
> > 
> > > Then how about ``the values of variables whose names appear in the
> > > expressions are re-evaluated every time''?
> > 
> > I'm afraid that this statement is true for fixed variable objects too,
> > and it still makes it sound like we pick variables, and then reevaluate it.
> > Instead, we reparse entire expression which can find completely different
> > variables.
> 
> Well, I'm afraid I don't understand what you mean.  Please show me an
> example where reparsing an expression would yield something different
> each time.

void foo (int i)
{
	...
}

void bar (int i)
{
	...
}


If you create a fixed varobj in 'bar', then each time you updating, new value of
bar's i will be read. If you create a floating varobj in 'bar', then if you update
it while still in bar, new value of bar's i will be read. If you update it in foo,
then the value of foo's i will be used. 

So while for fixed varobj's update fetches new value of 'i', for floating varobjs
we also decide which 'i' to use each time.

- Volodya