mirror of
https://github.com/VectorCamp/vectorscan.git
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139 lines
5.1 KiB
C++
139 lines
5.1 KiB
C++
/*
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* Copyright (c) 2015, Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/** \file
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* \brief Limex NFA construction code.
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*/
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#ifndef NG_LIMEX_H
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#define NG_LIMEX_H
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#include "ue2common.h"
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#include "som/som.h"
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#include "util/alloc.h"
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#include <map>
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#include <memory>
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#include <vector>
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struct NFA;
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namespace ue2 {
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class CharReach;
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class NG;
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class NGHolder;
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class ReportManager;
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struct CompileContext;
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/** \brief Determine if the given graph is implementable as an NFA.
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*
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* Returns zero if the NFA is not implementable (usually because it has too
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* many states for any of our models). Otherwise returns the number of states.
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*
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* ReportManager is used by NFA_SUFFIX and NFA_OUTFIX only. NFA_PREFIX and
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* NFA_INFIX use unmanaged rose-local reports.
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*/
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u32 isImplementableNFA(const NGHolder &g, const ReportManager *rm,
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const CompileContext &cc);
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/** \brief Late-stage graph reductions.
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*
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* This will call \ref removeRedundancy and apply its changes to the given
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* holder only if it is implementable afterwards. */
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void reduceImplementableGraph(NGHolder &g, som_type som, const ReportManager *rm,
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const CompileContext &cc);
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/**
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* \brief For a given graph, count the number of accel states it will have in
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* an implementation.
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*
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* \return the number of accel states, or NFA_MAX_ACCEL_STATES + 1 if an
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* implementation would not be constructible.
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*/
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u32 countAccelStates(const NGHolder &g, const ReportManager *rm,
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const CompileContext &cc);
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/** \brief Construct an NFA from the given NFAGraph.
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*
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* Returns zero if the NFA is not implementable (usually because it has too
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* many states for any of our models). Otherwise returns the number of states.
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*
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* ReportManager is used by NFA_SUFFIX and NFA_OUTFIX only. NFA_PREFIX and
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* NFA_INFIX use unmanaged rose-local reports.
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*
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* Note: this variant of the function allows a model to be specified with the
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* \a hint parameter.
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*/
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aligned_unique_ptr<NFA>
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constructNFA(const NGHolder &g, const ReportManager *rm,
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const std::map<u32, u32> &fixed_depth_tops,
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const std::map<u32, std::vector<std::vector<CharReach>>> &triggers,
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bool compress_state, const CompileContext &cc);
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/** \brief Build a reverse NFA from the graph given, which should have already
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* been reversed.
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*
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* Used for reverse NFAs used in SOM mode.
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*/
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aligned_unique_ptr<NFA> constructReversedNFA(const NGHolder &h,
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const CompileContext &cc);
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#ifndef RELEASE_BUILD
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/** \brief Construct an NFA (with model type hint) from the given NFAGraph.
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*
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* Returns zero if the NFA is not implementable (usually because it has too
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* many states for any of our models). Otherwise returns the number of states.
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*
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* ReportManager is used by NFA_SUFFIX and NFA_OUTFIX only. NFA_PREFIX and
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* NFA_INFIX use unmanaged rose-local reports.
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*
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* Note: this variant of the function allows a model to be specified with the
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* \a hint parameter.
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*/
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aligned_unique_ptr<NFA>
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constructNFA(const NGHolder &g, const ReportManager *rm,
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const std::map<u32, u32> &fixed_depth_tops,
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const std::map<u32, std::vector<std::vector<CharReach>>> &triggers,
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bool compress_state, u32 hint, const CompileContext &cc);
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/** \brief Build a reverse NFA (with model type hint) from the graph given,
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* which should have already been reversed.
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*
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* Used for reverse NFAs used in SOM mode.
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*/
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aligned_unique_ptr<NFA> constructReversedNFA(const NGHolder &h, u32 hint,
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const CompileContext &cc);
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#endif // RELEASE_BUILD
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} // namespace ue2
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#endif // NG_METEOR_H
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