trace, notrace

Arguments

Returns

With no argument, t, or with a code argument, the result of evaluating code.

Description

These functions turn tracing (execution tracking to standard output) on or off, either at the global level, or for the duration of the evaluation of code, if provided.

Example

#!/usr/local/bin/gamma -d

/* here is an example of a troublesome function and its
   return being debugged with the aid of trace() and
   notrace() functions.  
*/

a = 0;
b = 1;
trace();
function trouble_function(x,y) {y/x;}
results = trouble_function(a,b);
notrace();
princ(results, "\n");
		

Gamma generates the following:

(defun trouble_function (x y) (/ y x))
--> trouble_function
(trouble_function a b)
  (/ y x)
  --> inf
--> inf
(setq results (trouble_function a b))
--> inf
(notrace)
inf