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/* Graph representation.
Copyright (C) 2007-2021 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/>. */
#ifndef GCC_GRAPHDS_H
#define GCC_GRAPHDS_H
/* 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. */
struct obstack ob; /* Obstack for vertex and edge allocation. */
};
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);
typedef bool (*skip_edge_callback) (struct graph_edge *);
int graphds_dfs (struct graph *, int *, int,
vec<int> *, bool, bitmap, skip_edge_callback = NULL);
int graphds_scc (struct graph *, bitmap, skip_edge_callback = NULL);
void graphds_domtree (struct graph *, int, int *, int *, int *);
typedef void (*graphds_edge_callback) (struct graph *,
struct graph_edge *, void *);
void for_each_edge (struct graph *, graphds_edge_callback, void *);
void free_graph (struct graph *g);
#endif /* GCC_GRAPHDS_H */
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