1 | /* |
2 | * Copyright (c) 2015-2016, 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 merging ("uncalc") |
31 | */ |
32 | |
33 | #ifndef NG_UNCALC_COMPONENTS_H |
34 | #define NG_UNCALC_COMPONENTS_H |
35 | |
36 | #include <map> |
37 | #include <vector> |
38 | |
39 | namespace ue2 { |
40 | |
41 | struct CompileContext; |
42 | struct Grey; |
43 | class NGHolder; |
44 | class ReportManager; |
45 | |
46 | /** |
47 | * \brief Returns the common prefix length for a pair of graphs. |
48 | * |
49 | * The CPL is calculated based the topological ordering given by the state |
50 | * indices for each graph. |
51 | */ |
52 | u32 commonPrefixLength(const NGHolder &ga, const NGHolder &gb); |
53 | |
54 | /** |
55 | * \brief Merge the group of graphs in \p cluster where possible. |
56 | * |
57 | * The (from, to) mapping of merged graphs is returned. |
58 | */ |
59 | std::map<NGHolder *, NGHolder *> |
60 | mergeNfaCluster(const std::vector<NGHolder *> &cluster, const ReportManager *rm, |
61 | const CompileContext &cc); |
62 | |
63 | /** |
64 | * \brief Merge graph \p ga into graph \p gb. |
65 | * |
66 | * Returns false on failure. On success, \p gb is reduced via \ref |
67 | * reduceImplementableGraph and renumbered. |
68 | */ |
69 | bool mergeNfaPair(const NGHolder &ga, NGHolder &gb, const ReportManager *rm, |
70 | const CompileContext &cc); |
71 | |
72 | } // namespace ue2 |
73 | |
74 | #endif |
75 | |