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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.2.2/] [gcc/] [et-forest.h] - Blame information for rev 304

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/* Et-forest data structure implementation.
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   Copyright (C) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; see the file COPYING3.  If not see
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   <http://www.gnu.org/licenses/>.  */
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/* This package implements ET forest data structure. Each tree in
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   the structure maintains a tree structure and offers logarithmic time
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   for tree operations (insertion and removal of nodes and edges) and
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   poly-logarithmic time for nearest common ancestor.
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   ET tree stores its structure as a sequence of symbols obtained
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   by dfs(root)
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   dfs (node)
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   {
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     s = node;
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     for each child c of node do
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       s = concat (s, c, node);
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     return s;
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   }
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   For example for tree
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            1
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          / | \
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         2  3  4
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       / |
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      4  5
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   the sequence is 1 2 4 2 5 3 1 3 1 4 1.
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   The sequence is stored in a slightly modified splay tree.
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   In order to support various types of node values, a hashtable
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   is used to convert node values to the internal representation.  */
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#ifndef _ET_TREE_H
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#define _ET_TREE_H
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#include <ansidecl.h>
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/* The node representing the node in an et tree.  */
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struct et_node
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{
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  void *data;                   /* The data represented by the node.  */
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  int dfs_num_in, dfs_num_out;  /* Number of the node in the dfs ordering.  */
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  struct et_node *father;       /* Father of the node.  */
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  struct et_node *son;          /* The first of the sons of the node.  */
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  struct et_node *left;
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  struct et_node *right;        /* The brothers of the node.  */
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  struct et_occ *rightmost_occ; /* The rightmost occurrence.  */
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  struct et_occ *parent_occ;    /* The occurrence of the parent node.  */
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};
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struct et_node *et_new_tree (void *data);
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void et_free_tree (struct et_node *);
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void et_free_tree_force (struct et_node *);
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void et_free_pools (void);
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void et_set_father (struct et_node *, struct et_node *);
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void et_split (struct et_node *);
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struct et_node *et_nca (struct et_node *, struct et_node *);
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bool et_below (struct et_node *, struct et_node *);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* _ET_TREE_H */

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