Need window of backtrack points during debugging - discuss.visual-prolog.com

Ferenc Nagy · Post by **Ferenc Nagy** » 17 Sep 2015 7:31

The older VIP versions had one more debug window: The stack of backtrack points.
The Turbo and PDC Prolog debug window showed clearly which statement is a backtrack point in the run stack.

Post by **Thomas Linder Puls** » 17 Sep 2015 18:14

Backtrack points and catch-points are shown in the run stack as described in Ide/Debugger#Run_Stack_Window.

Peter Muraya · Post by **Peter Muraya** » 18 Sep 2015 6:31

Frank and Thomas,
I only use the run stack window for tracing backwards which predicates were executed before I got to the current breakpoint. I have not been able to follow/interpret/use the many graphics accompanying each entry in that window.

Post by **Thomas Linder Puls** » 18 Sep 2015 8:20

I agree there are many symbols, but some of it is not that difficult.

If the code returns normally, then you will get back to the entry just below.

If it fails you will get to the first level (from top down) that have a green down a arrow. Actually you will need to expand that node to see where you really end up (the deepest nested green down arrow).

If terminates wit an exception you will get to the first entry (from top down) that have a red line (try-catch or try-finally).