# Re: Finding the set of recursive calls

## "Martin Ward" <Martin.Ward@durham.ac.uk>24 Jul 2002 02:21:12 -0400

From comp.compilers

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 From: "Martin Ward" Newsgroups: comp.compilers Date: 24 Jul 2002 02:21:12 -0400 Organization: Compilers Central Keywords: analysis Posted-Date: 24 Jul 2002 02:21:12 EDT

> Given complete call information, is there an algorithm to determine
> which functions can be called recursively ?

A function can be called recursively if there is a path from
the function to itself in the call graph. So your question reduces
to a reachability problem in the call graph (is A reachable from A?).
Reachability can be solved in linear time, so you can find the set
of all recursive functions in no more than quadratic time.

Martin

Martin.Ward@durham.ac.uk http://www.cse.dmu.ac.uk/~mward/ Erdos number: 4
G.K.Chesterton web site: http://www.cse.dmu.ac.uk/~mward/gkc/

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