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 acceleration analysis code. 31 */ 32 33 #ifndef NG_LIMEX_ACCEL_H 34 #define NG_LIMEX_ACCEL_H 35 36 #include "ng_holder.h" 37 #include "ng_misc_opt.h" 38 #include "ue2common.h" 39 #include "nfa/accelcompile.h" 40 #include "util/accel_scheme.h" 41 #include "util/charreach.h" 42 #include "util/flat_containers.h" 43 #include "util/order_check.h" 44 45 #include <map> 46 #include <vector> 47 48 namespace ue2 { 49 50 /* compile time accel defs */ 51 #define MAX_MERGED_ACCEL_STOPS 200 52 #define ACCEL_MAX_STOP_CHAR 24 53 #define ACCEL_MAX_FLOATING_STOP_CHAR 192 /* accelerating sds is important */ 54 55 // forward-declaration of CompileContext 56 struct CompileContext; 57 58 void findAccelFriends(const NGHolder &g, NFAVertex v, 59 const std::map<NFAVertex, BoundedRepeatSummary> &br_cyclic, 60 u32 offset, flat_set<NFAVertex> *friends); 61 62 #define DOUBLE_SHUFTI_LIMIT 20 63 64 NFAVertex get_sds_or_proxy(const NGHolder &g); 65 66 AccelScheme nfaFindAccel(const NGHolder &g, const std::vector<NFAVertex> &verts, 67 const std::vector<CharReach> &refined_cr, 68 const std::map<NFAVertex, BoundedRepeatSummary> &br_cyclic, 69 bool allow_wide, bool look_for_double_byte = false); 70 71 AccelScheme findBestAccelScheme(std::vector<std::vector<CharReach> > paths, 72 const CharReach &terminating, 73 bool look_for_double_byte = false); 74 75 /** \brief Check if vertex \a v is an accelerable state (for a limex NFA). If a 76 * single byte accel scheme is found it is placed into *as 77 */ 78 bool nfaCheckAccel(const NGHolder &g, NFAVertex v, 79 const std::vector<CharReach> &refined_cr, 80 const std::map<NFAVertex, BoundedRepeatSummary> &br_cyclic, 81 AccelScheme *as, bool allow_wide); 82 83 84 } // namespace ue2 85 86 #endif 87