Can a function know what other function called it?

On 23/05/2009 4:55 PM, Robert Gentleman wrote:

Kynn Jones wrote:

  and you have a breakpoint in bar, you could not (easily) 
distinguish which of
the two calls to bar was active. There is no line counter or anything 
of that
sort available.

The evaluator doesn't pay any attention to srcref records, so this is 
still true, but it would be possible to keep the srcref on the stack 
as well as all the other info there.

I've written code (and I think I sent it to you last year) that can do 
things like replacing the statement coming from a particular line of a 
file with whatever code you like; this could be used in writing a nice 
source-level debugger.

Duncan Murdoch

 best wishes
   Robert