gcc/graphds.h

   1 /* Graph representation.
   2    Copyright (C) 2007, 2008
   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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* Structure representing edge of a graph.  */
  22
  23 struct graph_edge
  24 {
  25   int src, dest;        /* Source and destination.  */
  26   struct graph_edge *pred_next, *succ_next;
  27                         /* Next edge in predecessor and successor lists.  */
  28   void *data;           /* Data attached to the edge.  */
  29 };
  30
  31 /* Structure representing vertex of a graph.  */
  32
  33 struct vertex
  34 {
  35   struct graph_edge *pred, *succ;
  36                         /* Lists of predecessors and successors.  */
  37   int component;        /* Number of dfs restarts before reaching the
  38                            vertex.  */
  39   int post;             /* Postorder number.  */
  40   void *data;           /* Data attached to the vertex.  */
  41 };
  42
  43 /* Structure representing a graph.  */
  44
  45 struct graph
  46 {
  47   int n_vertices;       /* Number of vertices.  */
  48   struct vertex *vertices;
  49                         /* The vertices.  */
  50   htab_t indices;       /* Fast lookup for indices.  */
  51 };
  52
  53 struct graph *new_graph (int);
  54 void dump_graph (FILE *, struct graph *);
  55 struct graph_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> *, 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 graph_edge *);
  62 void for_each_edge (struct graph *, graphds_edge_callback);
  63 void free_graph (struct graph *g);