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+/* Generic dominator tree walker
+   Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
+   Contributed by Diego Novillo <dnovillo@redhat.com>
+
+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 2, 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 COPYING.  If not, write to
+the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA.  */
+
+typedef void *void_p;
+DEF_VEC_P(void_p);
+DEF_VEC_ALLOC_P(void_p,heap);
+
+/* This is the main data structure for the dominator walker.  It provides
+   the callback hooks as well as a convenient place to hang block local
+   data and pass-global data.  */
+
+struct dom_walk_data
+{
+  /* This is the direction of the dominator tree we want to walk.  i.e.,
+     if it is set to CDI_DOMINATORS, then we walk the dominator tree,
+     if it is set to CDI_POST_DOMINATORS, then we walk the post
+     dominator tree.  */
+  ENUM_BITFIELD (cdi_direction) dom_direction : 2;
+
+  /* Nonzero if the statement walker should walk the statements from
+     last to first within a basic block instead of first to last.
+
+     Note this affects both statement walkers.  We haven't yet needed
+     to use the second statement walker for anything, so it's hard to
+     predict if we really need the ability to select their direction
+     independently.  */
+  BOOL_BITFIELD walk_stmts_backward : 1;
+
+  /* Function to initialize block local data.
+
+     Note that the dominator walker infrastructure may provide a new
+     fresh, and zero'd block local data structure, or it may re-use an
+     existing block local data structure.
+
+     If the block local structure has items such as virtual arrays, then
+     that allows your optimizer to re-use those arrays rather than
+     creating new ones.  */
+  void (*initialize_block_local_data) (struct dom_walk_data *,
+				       basic_block, bool);
+
+  /* Function to call before the statement walk occurring before the
+     recursive walk of the dominator children. 
+
+     This typically initializes a block local data and pushes that
+     data onto BLOCK_DATA_STACK.  */
+  void (*before_dom_children_before_stmts) (struct dom_walk_data *,
+					    basic_block);
+
+  /* Function to call to walk statements before the recursive walk
+     of the dominator children.  */
+  void (*before_dom_children_walk_stmts) (struct dom_walk_data *,
+					  basic_block, block_stmt_iterator);
+
+  /* Function to call after the statement walk occurring before the
+     recursive walk of the dominator children.  */
+  void (*before_dom_children_after_stmts) (struct dom_walk_data *,
+					   basic_block);
+
+  /* Function to call before the statement walk occurring after the
+     recursive walk of the dominator children.  */
+  void (*after_dom_children_before_stmts) (struct dom_walk_data *,
+					   basic_block);
+
+  /* Function to call to walk statements after the recursive walk
+     of the dominator children.  */
+  void (*after_dom_children_walk_stmts) (struct dom_walk_data *,
+					 basic_block, block_stmt_iterator);
+
+  /* Function to call after the statement walk occurring after the
+     recursive walk of the dominator children. 
+
+     This typically finalizes any block local data and pops
+     that data from BLOCK_DATA_STACK.  */
+  void (*after_dom_children_after_stmts) (struct dom_walk_data *,
+					  basic_block);
+
+  /* Global data for a walk through the dominator tree.  */
+  void *global_data;
+
+  /* Stack of any data we need to keep on a per-block basis.
+
+     If you have no local data, then BLOCK_DATA_STACK will be NULL.  */
+  VEC(void_p,heap) *block_data_stack;
+
+  /* Size of the block local data.   If this is zero, then it is assumed
+     you have no local data and thus no BLOCK_DATA_STACK as well.  */
+  size_t block_local_data_size;
+
+  /* From here below are private data.  Please do not use this
+     information/data outside domwalk.c.  */
+
+  /* Stack of available block local structures.  */
+  VEC(void_p,heap) *free_block_data;
+
+  /* Interesting blocks to process.  If this field is not NULL, this
+     set is used to determine which blocks to walk.  If we encounter
+     block I in the dominator traversal, but block I is not present in
+     INTERESTING_BLOCKS, then none of the callback functions are
+     invoked on it.  This is useful when a particular traversal wants
+     to filter out non-interesting blocks from the dominator tree.  */
+  sbitmap interesting_blocks;
+};
+
+void walk_dominator_tree (struct dom_walk_data *, basic_block);
+void init_walk_dominator_tree (struct dom_walk_data *);
+void fini_walk_dominator_tree (struct dom_walk_data *);