Description:

B::Graph module is a backend to the Perl compiler (B::*) which,
instead of outputting bytecode or C based on Perl's compiled version
of a program, writes descriptions in graph-description languages
specifying graphs that show the program's structure. It currently
generates descriptions for the VCG tool
("http://www.cs.uni-sb.de/RW/users/sander/html/gsvcg1.html") and Dot
(part of the graph visualization toolkit from AT&T:
"http://www.research.att.com/sw/tools/graphviz/"). It also can produce
plain text output (which is more useful for debugging the module
itself than anything else).