A 'call graph' is a debugging aid which provides a representation of how one particular function calls other functions.
One would use a call graph when trying to figure out what calls a particular function,
or is called by a function, particularly when trying to track down why the code
is failing.

[[insert example here]]
 proc a {} {b; c}
 proc b {} {d; c}
 proc c {} {puts ok}
 proc d {} {puts hello}
The call graph here is (directed, caller above callee)
     a
    / \
   b  |
  /  \|
 d    c
[[insert pointers to tools for producing call graphs.]]

Distinguish [static call graph] (derived by observing the source code) and [dynamic call graph] (derived by observing the calling "behavior" of a program).



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