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https://github.com/VectorCamp/vectorscan.git
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134 lines
4.6 KiB
C++
134 lines
4.6 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 NG, NGHolder, NGWrapper declarations.
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*/
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#ifndef NG_H
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#define NG_H
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#include "ng_holder.h"
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#include "ue2common.h"
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#include "parser/position.h"
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#include "som/slot_manager.h"
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#include "som/som.h"
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#include "util/boundary_reports.h"
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#include "util/compile_context.h"
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#include "util/depth.h"
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#include "util/graph.h"
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#include "util/report_manager.h"
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#include "util/ue2_containers.h"
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#include <deque>
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#include <map>
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#include <memory>
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#include <utility>
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#include <vector>
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#include <boost/core/noncopyable.hpp>
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namespace ue2 {
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struct CompileContext;
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struct ue2_literal;
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class NGWrapper : public NGHolder {
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public:
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NGWrapper(unsigned int expressionIndex, bool highlander, bool utf8,
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bool prefilter, const som_type som, ReportID rid, u64a min_offset,
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u64a max_offset, u64a min_length);
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~NGWrapper() override;
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/** index of the expression represented by this graph, used
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* - down the track in error handling
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* - identifying parts of an expression in highlander mode
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*/
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const unsigned int expressionIndex;
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const ReportID reportId; /**< user-visible report id */
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const bool highlander; /**< user-specified single match only */
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const bool utf8; /**< UTF-8 mode */
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const bool prefilter; /**< prefiltering mode */
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const som_type som; /**< SOM type requested */
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u64a min_offset; /**< extparam min_offset value */
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u64a max_offset; /**< extparam max_offset value */
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u64a min_length; /**< extparam min_length value */
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};
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class RoseBuild;
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class SmallWriteBuild;
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class NG : boost::noncopyable {
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public:
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NG(const CompileContext &in_cc, unsigned in_somPrecision);
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~NG();
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/** \brief Consumes a pattern, returns false or throws a CompileError
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* exception if the graph cannot be consumed. */
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bool addGraph(NGWrapper &w);
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/** \brief Consumes a graph, cut-down version of addGraph for use by SOM
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* processing. */
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bool addHolder(NGHolder &h);
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/** \brief Adds a literal to Rose, used by literal shortcut passes (instead of
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* using \ref addGraph) */
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bool addLiteral(const ue2_literal &lit, u32 expr_index, u32 external_report,
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bool highlander, som_type som);
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/** \brief Maximum history in bytes available for use by SOM reverse NFAs,
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* a hack for pattern support (see UE-1903). This is always set to the max
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* "lookbehind" length. */
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const u32 maxSomRevHistoryAvailable;
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/** \brief The length of the shortest corpus which can match a pattern
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* contained in the NG (excluding the boundary reports used by vacuous
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* patterns, which give an effective minWidth of zero). */
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depth minWidth;
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ReportManager rm;
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SomSlotManager ssm;
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BoundaryReports boundary;
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const CompileContext cc;
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const std::unique_ptr<RoseBuild> rose; //!< Rose builder.
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const std::unique_ptr<SmallWriteBuild> smwr; //!< SmallWrite builder.
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};
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/** \brief Run graph reduction passes.
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*
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* Shared with the small write compiler.
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*/
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void reduceGraph(NGHolder &g, som_type som, bool utf8, const CompileContext &cc);
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} // namespace ue2
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#endif
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