The FLOW Program Control Analyzer

FLOW uses an input file from the FLOPPY (FORTRAN Language 
Oriented Parser evolution) to generate information about 
the flow of control in a program. One of the most useful 
features is the generation of control flow diagrams which 
can be used to analyze the flow of control in a program. 
To use FLOW, FLOPPY must be run on the code first:

>floppy -t -cn file.f

Generates a file.f.floptre file that is used by FLOW. 
file.f is any file that contains FORTRAN code, flow can 
indicate all internal and external calls. (See FLOPPY 
documentaion for more about FLOPPY).

To invoke FLOW in interactive (QUERY) mode:

>flow -q file.f.floptre

FLOW options:

-q		Interactive QUERY mode
-s		Text based STRUCTURE CHART (written to protre.dat)
-g		GRAPHICAL CHART (written to flow.ps)
-n (nodename) 	Specifies (an alternate) top NODE in the chart
-E		Excludes EXTERNAL nodes from chart
-c		Creates a COMMON block chart
-i (ignore)	Specifies module names to IGNORE with -s