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