Cyclomatic complexity

[Jos De Laender <jdla@sh.bel.alcatel.be>]

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Hi,

Although I'm not sure if it is relevant, I first of all want to
mention that I'm active in development using VHDL. This is a
programming language with ADA roots, used especially in hardware
development. For it being a hardware description language, not too
many software principles are usually applied on it.

I read some stuff about measuring complexity using 'Mc Cabe's 
cyclomatic complexity measurement' in software. 
Although it seems quite nice on the level of one module, I have 
difficulties to understand how the stuff glues when putting together 
'modules' or 'subprograms'.

Suppose that I have :

A main program 'A' , with complexity 2 and integration complexity 2
A subprogram 'B' , with complexity 2 and integration complexity 2
A subprogram 'C' , with complexity 3 and integration complexity 2
A subprogram 'D' , with complexity 2 and integration complexity 1

'A' calls 'B' at one place and calls 'C' at two places. 
'B' and 'C' both call 'D' at one place.

How should I calculate the total complexity of the whole program ?

Does the number of calls of one particular subprogram by one 
particular subprogram influence the result ? How ?

Does the fact that a subprogram is separately verified or not influence
the result (Subprogram in a package or not) ? How ?

I would appreciate very much any clarification or pointer to such
a clarification. Hereby I put my hope especially on the ADA - guys ;-)

Kind regards.

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=== Expressed opinions are not necessarily those of Alcatel ===


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