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File:Some types of control flow graphs.svg

Original file ‎(SVG file, nominally 270 × 491 pixels, file size: 9 KB)

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Description
English: Some examples of control flow graphs (CFG):

(a) the CFG of a if-then-else (b) a while loop (c) a natural loop with two exits, e.g. while with an if...break in the middle; non-structured by reducible (d) an irreducible CFG: a loop with to entry points, e.g. goto into a while loop

Source code in DOT, svg generated with graphviz: 

digraph CFG_examples {
  node [shape=circle width=0.3 height=0.3 label="" fixedsize=true]
  edge [arrowsize=0.5]
  if -> { then; else } -> fi
  while -> body [weight=3]
  body -> while:w
  while -> end
  body -> end [style="invis" weight=3]
  fi -> exit1 [style="invis"]
  exit1 -> exit2
  exit2 -> body2 [weight=4]
  body2 -> exit1:w
  exit1 -> out:e
  exit2 -> out
  body2 -> out [style="invis" weight=4]
  end -> top [style="invis"]
  top -> entry1 [weight=2]
  entry1 -> out2
  top -> entry2:w 
  entry1 -> entry2 [weight=4]
  entry2 -> entry1:w
  entry2 -> out2 [style="invis" weight=4]
  if [xlabel = "(a)"]
  while [xlabel = "(b)"]
  exit1 [xlabel = "(c)"]
  top [xlabel = "(d)"]
} /*end digraph*/
Date
Source Own work
Author JMP EAX

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current06:57, 27 July 2014Thumbnail for version as of 06:57, 27 July 2014270 × 491 (9 KB)JMP EAX (talk | contribs)User created page with UploadWizard

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