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proc coverage example
Other Facilities in Tcl example from a Well House Consultants training course
More on Other Facilities in Tcl [link]

This example is described in the following article(s):
   • Coverage map in Tcl - how many times has each proc been called? - [link]

Source code: times Module: T214

# Provision of a simple coverage map in Tcl
# Shows how you can find the number of calls made to each proc in your code

# Globals needed during coverage analysis
# (Have to use globals as we cannot change arguments)

# Namespace resolution needs adding if you use namepaces

set call_order ""
set procnames ""

# Define here any procs that we do NOT want analysed, such as our own ones relating to coverage

proc report {} {
        global call_order
        foreach call $call_order {
                incr callcounter($call)
        }
        puts [format "\n%20s %5s" "proc name" count]
        puts [format "%20s %5s" --------- -----]
        # change to loop through procnames if you want to include procs not called
        foreach fn [array names callcounter] {
                puts [format "%20s %5d" $fn $callcounter($fn)]
        }
}

# Hide the original proc command and write a new one
# which wraps (decorates) the original with our coverage code

rename proc my_proc
my_proc proc {name arglist body} {

        # stuff to log as we apply the wrapping
        # (making note of all the names of the things we wrap
        global procnames
        lappend procnames $name

        # Within the body, add in extra code to note each call made
        # This is a bit crude - simply a long list of calls
        # Use of quotes rather than braces to ensure dollar expansion at the right time
        # semicolon to end statements, as backslash-return become a space not a return
        my_proc $name $arglist " \
                global call_order; \
                lappend call_order $name; \
                $body \
                "
        }

# ------------------------------------------------------------------------

# The application

proc area {a b} {
        # area of rectangular table
        return [expr $a * $b]
        }
proc circum {a b} {
        # circumference of rectangular table
        return [expr 2 * ($a + $b)]
        }
proc doggydistance {a b} {
        # Shortest distance from edge to middle of table
        set closest [expr (($a > $b) ? $b : $a) / 2.0]
        return $closest
        }

set a [area 100 200]
set b [circum 100 200]
set b [circum 100 200]
set b [circum 100 200]
set b [circum 100 200]

puts $a
puts $b

# ---------------------------------------------------------

# Reporting on coverage after it's run

puts "-------------------------------"
puts "\n** List of calls made in order"
puts $call_order

puts "\n** Counts of calls to each wrapped proc"
report

puts "\n** List of procs wrapped"
puts $procnames

# ------------------------------------------------------

# Sample Output

# WomanWithCat:demo grahamellis$ tclsh times
# 20000
# 600
# -------------------------------
#
# ** List of calls made in order
# area circum circum circum circum
#
# ** Counts of calls to each wrapped proc
#
# proc name count
# --------- -----
# area 1
# circum 4
#
# ** List of procs wrapped
# area circum doggydistance
# WomanWithCat:demo grahamellis$
Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Tcl
 * Tcl Programming
 * Tcl Programming
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Tcl, Tk and Expect are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Other Facilities in Tcl" training module. You'll find a description of the topic and some other closely related examples on the "Other Facilities in Tcl" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
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