33 struct Cluster {  struct
34   Cluster(int sec, size_t s) : next(sec), prev(sec), size(s) {}  in Cluster()  function
57   std::vector<Cluster> clusters;
63 // Maximum amount the combined cluster density can be worse than the original
64 // cluster to consider merging.
67 // Maximum cluster size in bytes.
98     // output.  This messes with the cluster size and density calculations.  We  in CallGraphSort()
113     Cluster &toC = clusters[to];  in CallGraphSort()
119   for (Cluster &c : clusters)  in CallGraphSort()
124 static bool isNewDensityBad(Cluster &a, Cluster &b) {  in isNewDensityBad()
129 // Find the leader of V's belonged cluster (represented as an equivalence
140 static void mergeClusters(std::vector<Cluster> &cs, Cluster &into, int intoIdx,  in mergeClusters()
141                           Cluster &from, int fromIdx) {  in mergeClusters()
166     // The cluster index is the same as the index of its leader here because  in run()
167     // clusters[L] has not been merged into another cluster yet.  in run()
168     Cluster &c = clusters[l];  in run()
178     Cluster *predC = &clusters[predL];  in run()