Can a function know what other function called it?
On 5/24/2009 10:23 AM, Romain Francois wrote:
Duncan Murdoch wrote:
On 23/05/2009 4:55 PM, Robert Gentleman wrote:
Kynn Jones wrote:
[snip]
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.
Please
Here's a patch file that does this. (Will it make it through to the mailing list? We'll see.) It's still in progress, so I'm not even ready to put it into R-devel, but you're welcome to try it out. The basic idea is that it attaches srcref attributes to the values returned from sys.calls (which won't be displayed, but if you want to play with them you can) and to .Traceback (which traceback() will display). debug() will also show them. Not sure what bad side effects (e.g. on execution time) this has. Duncan Murdoch
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.
yes
Duncan Murdoch
best wishes Robert
-------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: srcref.patch URL: <https://stat.ethz.ch/pipermail/r-devel/attachments/20090526/252500d2/attachment.pl>