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// -*- C++ -*-
/**
* Copyright (C) 1989 Free Software Foundation, Inc.
* written by Douglas C. Schmidt (d.schmidt@vanderbilt.edu)
*
* This file is part of GNU GPERF.
*
* This program 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
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef GEN_PERF_H
#define GEN_PERF_H
#include "Options.h"
#include "Key_List.h"
#include "Bool_Array.h"
#include "ace/Copy_Disabled.h"
/*
* Provides high-level routines to manipulate the keyword list
* structures the code generation output.
*/
class Gen_Perf : private ACE_Copy_Disabled
{
public:
/// Constructor.
Gen_Perf (void);
/// Destructor
~Gen_Perf (void);
/// Attempt to generate a perfect hash function.
int run (void);
private:
int open (void);
int change (List_Node *prior, List_Node *curr);
int affects_prev (char c, List_Node *curr);
int compute_perfect_hash (void);
int compute_binary_search (void);
int compute_linear_search (void);
static int hash (List_Node *key_node);
static int compute_disjoint_union (char *s1, char *s2, char *s3);
static void sort_set (char *union_set, int len);
/// Maximum possible hash value.
int max_hash_value;
/// Records fewest # of collisions for asso value.
int fewest_collisions;
/// Number of keywords processed without a collision.
int num_done;
/// Disjoint union.
char *union_set;
/// List of the keys we're trying to map into a perfect hash
/// function.
Key_List key_list;
/// Table that keeps track of key collisions.
Bool_Array char_search;
};
#endif /* GEN_PERF_H */
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