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