Re: [Maxima-discuss] line numbers while debugging a script

[Robert D. <rob...@gm...>]

On 2017-08-24, Helmut Jarausch <jar...@sk...> wrote:

> whenever I get control in Maxima's debugger, the displayed line numbers  
> are too small (in most cases).

> - empty lines in front of a function definition at the outermost level  
> increase the discrepancy by 1
>    except when  following a comment
>
> - any function definition preceeding the function to be debugged  
> increases the discrepancy by 1

I'm pretty sure the debugger is just using the line number information
that's pasted into input expressions by the parser. You can see the line
number stuff if you look at the Lisp representation of the function.
E.g. let's say you have a function f(x) := ... in a file. After loading
the file, :lisp (symbol-plist '$f) shows the function definition (among
any other properties). The line number info is a list of several items
(I don't know if the list is always the same) which is smashed into the
expression car. The first two items are a line number and a file name.
If line numbers are being displayed incorrectly, I guess either the
numbers are correct and the display is incorrect (so look at the
debugger code) or the line numbers are incorrect (so look at the parser
code). About the latter, see ADD-LINEINFO and NEWLINE in
src/nparse.lisp. Sorry I can't be more helpful. If you give a specific
example I might be able to investigate.

best,

Robert Dodier