44 }

    45 

    46 // Utilities to characterize effect statements

    47 static bool is_def(int usedef) {

    48   switch(usedef) {

    49   case Component::DEF:

    50   case Component::USE_DEF: return true; break;

    51   }

    52   return false;

    53 }

    54 

    55 static bool is_use(int usedef) {

    56   switch(usedef) {

    57   case Component::USE:

    58   case Component::USE_DEF:

    59   case Component::USE_KILL: return true; break;

    60   }

    61   return false;

    62 }

    63 

    64 static bool is_kill(int usedef) {

    65   switch(usedef) {

    66   case Component::KILL:

    67   case Component::USE_KILL: return true; break;

    68   }

    69   return false;