rumba: take into account DIFs that don't use nor are used by other DIFs

These DIFs needs to be considered for the Kahn algorithm and
computation of IPCPs.

Closes #11.

1 files changed, 12 insertions, 0 deletions

diff --git a/rumba/model.py b/rumba/model.py
index ccd60df..eee8fac 100644
--- a/rumba/model.py
+++ b/rumba/model.py
@@ -328,6 +328,10 @@ class Experiment:
         difsdeps_inc = dict()
 
         for node in self.nodes:
+            for dif in node.difs:
+                if dif not in difsdeps_adj:
+                    difsdeps_adj[dif] = set()
+
             for upper in node.dif_registrations:
                 for lower in node.dif_registrations[upper]:
                     if upper not in difsdeps_inc:
@@ -349,6 +353,14 @@ class Experiment:
             difsdeps_inc_cnt[dif] = len(difsdeps_inc[dif])
         del difsdeps_inc
 
+        # Init difsdeps_inc_cnt for those DIFs that do not
+        # act as lower IPCPs nor upper IPCPs for registration
+        # operations
+        for node in self.nodes:
+            for dif in node.difs:
+                if dif not in difsdeps_inc_cnt:
+                    difsdeps_inc_cnt[dif] = 0
+
         # Run Kahn's algorithm to compute topological
         # ordering on the DIFs graph.
         frontier = set()