1/*
2 * Copyright (c) 2015-2017, Intel Corporation
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * * Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of Intel Corporation nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** \file
30 * \brief State numbering and late graph restructuring code.
31 */
32
33#ifndef NG_RESTRUCTURING_H
34#define NG_RESTRUCTURING_H
35
36#include "ng_holder.h"
37#include "ue2common.h"
38#include "util/flat_containers.h"
39
40#include <unordered_map>
41
42namespace ue2 {
43
44/**
45 * \brief Special state index value meaning that the vertex will not
46 * participate in an (NFA/DFA/etc) implementation.
47 */
48static constexpr u32 NO_STATE = ~0;
49
50/**
51 * \brief Gives each participating vertex in the graph a unique state index.
52 */
53std::unordered_map<NFAVertex, u32>
54numberStates(NGHolder &h, const flat_set<NFAVertex> &tops);
55
56/**
57 * \brief Counts the number of states (vertices with state indices) in the
58 * graph.
59 */
60u32 countStates(const std::unordered_map<NFAVertex, u32> &state_ids);
61
62} // namespace ue2
63
64#endif
65