Re: Checking variable scope

["Rob Quill" <rob.quill@gmail.com>]

Hi,

I am stepping through the program, so I suppose I'd be looking to see
if the variable is in scope at the location of the PC.

How would I call lookup_symbol, given that information? I had a brief
look, but I wasn't sure what parameters to pass to the function, or
how to get the right values.

Thanks for your help.

Rob

On 22/11/06, Jim Blandy <jimb@codesourcery.com> wrote:
>
> "Rob Quill" <rob.quill@gmail.com> writes:
> > I am trying to make it possible to be able to check if a variable is
> > in scope at a given time. My current implementation for this involves
> > adding a parameter to parse_expression, and the parsing functions it
> > calls, all the way until it gets to the line:
> >
> > if (sym == 0)
> >    error ("No symbol \"%s\" in specified context.", copy_name ($3));
> >
> > in c-exp.y
> >
> > as which point it doesn't call error, but calls another function which
> > returns a value signifing that the variable is not in scope.
> >
> > Whilst this is OK, in that it (should) work, I was wondering if anyone
> > had a neater way of implementing it?
>
> Why not call lookup_symbol directly?  You can get the block that needs
> with block_for_pc_sect.  Are you selecting the location by source
> position, or PC, or what?
>