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).