void identify_vertices (struct graph *, int, int);
int graphds_dfs (struct graph *, int *, int,
VEC (int, heap) **, bool, bitmap);
int graphds_scc (struct graph *, bitmap);
void graphds_domtree (struct graph *, int, int *, int *, int *);
void identify_vertices (struct graph *, int, int);
int graphds_dfs (struct graph *, int *, int,
VEC (int, heap) **, bool, bitmap);
int graphds_scc (struct graph *, bitmap);
void graphds_domtree (struct graph *, int, int *, int *, int *);