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 NFA graph state squashing analysis. |
31 | */ |
32 | #ifndef NG_SQUASH_H |
33 | #define NG_SQUASH_H |
34 | |
35 | #include "ng_holder.h" |
36 | #include "som/som.h" |
37 | #include "ue2common.h" |
38 | |
39 | #include <unordered_map> |
40 | #include <boost/dynamic_bitset.hpp> |
41 | |
42 | namespace ue2 { |
43 | |
44 | class NGHolder; |
45 | class ReportManager; |
46 | |
47 | /** |
48 | * Dynamically-sized bitset, as an NFA can have an arbitrary number of states. |
49 | */ |
50 | using NFAStateSet = boost::dynamic_bitset<>; |
51 | |
52 | /** |
53 | * Populates the squash mask for each vertex (i.e. the set of states to be left |
54 | * on during squashing). |
55 | * |
56 | * The NFAStateSet in the output map is indexed by vertex_index. |
57 | */ |
58 | std::unordered_map<NFAVertex, NFAStateSet> |
59 | findSquashers(const NGHolder &g, som_type som = SOM_NONE); |
60 | |
61 | /** Filters out squash states intended only for use in DFA construction. */ |
62 | void filterSquashers(const NGHolder &g, |
63 | std::unordered_map<NFAVertex, NFAStateSet> &squash); |
64 | |
65 | /** Populates squash masks for states that can be switched off by highlander |
66 | * (single match) reporters. */ |
67 | std::unordered_map<NFAVertex, NFAStateSet> |
68 | findHighlanderSquashers(const NGHolder &g, const ReportManager &rm); |
69 | |
70 | } // namespace ue2 |
71 | |
72 | #endif // NG_SQUASH_H |
73 | |