gcc/graphds.h

   1 /* Graph representation.
   2    Copyright (C) 2007
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301, USA.  */
  21
  22 /* Structure representing edge of a graph.  */
  23
  24 struct edge
  25 {
  26   int src, dest;        /* Source and destination.  */
  27   struct edge *pred_next, *succ_next;
  28                         /* Next edge in predecessor and successor lists.  */
  29   void *data;           /* Data attached to the edge.  */
  30 };
  31
  32 /* Structure representing vertex of a graph.  */
  33
  34 struct vertex
  35 {
  36   struct edge *pred, *succ;
  37                         /* Lists of predecessors and successors.  */
  38   int component;        /* Number of dfs restarts before reaching the
  39                            vertex.  */
  40   int post;             /* Postorder number.  */
  41   void *data;           /* Data attached to the vertex.  */
  42 };
  43
  44 /* Structure representing a graph.  */
  45
  46 struct graph
  47 {
  48   int n_vertices;       /* Number of vertices.  */
  49   struct vertex *vertices;
  50                         /* The vertices.  */
  51 };
  52
  53 struct graph *new_graph (int);
  54 void dump_graph (FILE *, struct graph *);
  55 struct edge *add_edge (struct graph *, int, int);
  56 void identify_vertices (struct graph *, int, int);
  57 int graphds_dfs (struct graph *, int *, int,
  58                  VEC (int, heap) **, bool, bitmap);
  59 int graphds_scc (struct graph *, bitmap);
  60 void graphds_domtree (struct graph *, int, int *, int *, int *);
  61 typedef void (*graphds_edge_callback) (struct graph *, struct edge *);
  62 void for_each_edge (struct graph *, graphds_edge_callback);
  63 void free_graph (struct graph *g);