gcc/graphds.h

   1 /* Graph representation.
   2    Copyright (C) 2007-2021 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_GRAPHDS_H
  21 #define GCC_GRAPHDS_H
  22
  23 /* Structure representing edge of a graph.  */
  24
  25 struct graph_edge
  26 {
  27   int src, dest;        /* Source and destination.  */
  28   struct graph_edge *pred_next, *succ_next;
  29                         /* Next edge in predecessor and successor lists.  */
  30   void *data;           /* Data attached to the edge.  */
  31 };
  32
  33 /* Structure representing vertex of a graph.  */
  34
  35 struct vertex
  36 {
  37   struct graph_edge *pred, *succ;
  38                         /* Lists of predecessors and successors.  */
  39   int component;        /* Number of dfs restarts before reaching the
  40                            vertex.  */
  41   int post;             /* Postorder number.  */
  42   void *data;           /* Data attached to the vertex.  */
  43 };
  44
  45 /* Structure representing a graph.  */
  46
  47 struct graph
  48 {
  49   int n_vertices;          /* Number of vertices.  */
  50   struct vertex *vertices; /* The vertices.  */
  51   struct obstack ob;       /* Obstack for vertex and edge allocation.  */
  52 };
  53
  54 struct graph *new_graph (int);
  55 void dump_graph (FILE *, struct graph *);
  56 struct graph_edge *add_edge (struct graph *, int, int);
  57 void identify_vertices (struct graph *, int, int);
  58 typedef bool (*skip_edge_callback) (struct graph_edge *);
  59 int graphds_dfs (struct graph *, int *, int,
  60                  vec<int> *, bool, bitmap, skip_edge_callback = NULL);
  61 int graphds_scc (struct graph *, bitmap, skip_edge_callback = NULL);
  62 void graphds_domtree (struct graph *, int, int *, int *, int *);
  63 typedef void (*graphds_edge_callback) (struct graph *,
  64                                        struct graph_edge *, void *);
  65 void for_each_edge (struct graph *, graphds_edge_callback, void *);
  66 void free_graph (struct graph *g);
  67
  68 #endif /* GCC_GRAPHDS_H */