Imported gcc-4.4.3

[msp430-gcc.git] / gcc / graphds.h

diff --git a/gcc/graphds.h b/gcc/graphds.h
new file mode 100644 (file)
index 0000000..bc35479
--- /dev/null
+++ b/gcc/graphds.h
@@ -0,0 +1,63 @@
+/* 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);