| /* Graph representation. |

| Copyright (C) 2007, 2008 |

| Free Software Foundation, Inc. |

| |

| This file is part of GCC. |

| |

| GCC is free software; you can redistribute it and/or modify it under |

| the terms of the GNU General Public License as published by the Free |

| Software Foundation; either version 3, or (at your option) any later |

| version. |

| |

| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |

| WARRANTY; without even the implied warranty of MERCHANTABILITY or |

| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |

| for more details. |

| |

| You should have received a copy of the GNU General Public License |

| along with GCC; see the file COPYING3. If not see |

| <http://www.gnu.org/licenses/>. */ |

| |

| /* Structure representing edge of a graph. */ |

| |

| struct graph_edge |

| { |

| int src, dest; /* Source and destination. */ |

| struct graph_edge *pred_next, *succ_next; |

| /* Next edge in predecessor and successor lists. */ |

| void *data; /* Data attached to the edge. */ |

| }; |

| |

| /* Structure representing vertex of a graph. */ |

| |

| struct vertex |

| { |

| struct graph_edge *pred, *succ; |

| /* Lists of predecessors and successors. */ |

| int component; /* Number of dfs restarts before reaching the |

| vertex. */ |

| int post; /* Postorder number. */ |

| void *data; /* Data attached to the vertex. */ |

| }; |

| |

| /* Structure representing a graph. */ |

| |

| struct graph |

| { |

| int n_vertices; /* Number of vertices. */ |

| struct vertex *vertices; |

| /* The vertices. */ |

| htab_t indices; /* Fast lookup for indices. */ |

| }; |

| |

| struct graph *new_graph (int); |

| void dump_graph (FILE *, struct graph *); |

| struct graph_edge *add_edge (struct graph *, 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 *); |

| typedef void (*graphds_edge_callback) (struct graph *, struct graph_edge *); |

| void for_each_edge (struct graph *, graphds_edge_callback); |

| void free_graph (struct graph *g); |