if 0 {[Richard Suchenwirth] 2005-07-13 - Here's a simple sketch how you can get the "dynamic call graph" (which shows which procedure actually called which other in a program run). The idea is to overload the [proc] command, so that every proc body is augmented (in the beginning) with a call to a helper that records the names of caller and callee in a global array:
}
 rename proc _proc
 _proc proc {name argl body} {
    _proc $name $argl callgraph'report\n$body
 }
#-- This argument-less proc is prefixed to every proc defined with the overloaded command:
 _proc callgraph'report {} {
    if [catch {info level -2} res] {set res ""}
    set ::callgraph([lindex $res 0],[lindex [info level -1] 0]) ""
 }

#--- Testing
 proc a {} {b; c }
 proc b args {d; e}
 proc c {} {b; d}
 proc d {} {}
 proc e {} {}

 a
 parray callgraph
if 0 {which returns (the values are always "", a key a,b expresses that a called b):
 callgraph(,a)      =
 callgraph(,parray) =
 callgraph(a,b)     =
 callgraph(a,c)     =
 callgraph(b,d)     =
 callgraph(b,e)     =
 callgraph(c,b)     =
 callgraph(c,d)     =

----
[Category Debugging] | [Arts and crafts of Tcl-Tk programming]
}