mirror of
https://github.com/VectorCamp/vectorscan.git
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124 lines
4.5 KiB
C++
124 lines
4.5 KiB
C++
/*
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* Copyright (c) 2015-2016, 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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#ifndef MCCLELLANCOMPILE_H
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#define MCCLELLANCOMPILE_H
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#include "rdfa.h"
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#include "ue2common.h"
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#include "util/alloc.h"
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#include "util/charreach.h"
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#include "util/ue2_containers.h"
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#include <memory>
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#include <vector>
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#include <set>
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struct NFA;
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namespace ue2 {
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struct CompileContext;
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struct raw_report_info {
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raw_report_info();
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virtual ~raw_report_info();
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virtual u32 getReportListSize() const = 0; /* in bytes */
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virtual size_t size() const = 0; /* number of lists */
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virtual void fillReportLists(NFA *n, size_t base_offset,
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std::vector<u32> &ro /* out */) const = 0;
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};
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struct escape_info {
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CharReach outs;
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CharReach outs2_single;
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flat_set<std::pair<u8, u8>> outs2;
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bool outs2_broken = false;
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u32 offset = 0;
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u32 outs2_offset = 0;
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};
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class dfa_build_strat {
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public:
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virtual ~dfa_build_strat();
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virtual raw_dfa &get_raw() const = 0;
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virtual std::unique_ptr<raw_report_info> gatherReports(
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std::vector<u32> &reports /* out */,
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std::vector<u32> &reports_eod /* out */,
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u8 *isSingleReport /* out */,
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ReportID *arbReport /* out */) const = 0;
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virtual escape_info find_escape_strings(dstate_id_t this_idx) const = 0;
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virtual size_t accelSize(void) const = 0;
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virtual void buildAccel(dstate_id_t this_idx, const escape_info &info,
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void *accel_out) = 0;
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};
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class mcclellan_build_strat : public dfa_build_strat {
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public:
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explicit mcclellan_build_strat(raw_dfa &r) : rdfa(r) {}
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raw_dfa &get_raw() const override { return rdfa; }
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std::unique_ptr<raw_report_info> gatherReports(
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std::vector<u32> &reports /* out */,
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std::vector<u32> &reports_eod /* out */,
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u8 *isSingleReport /* out */,
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ReportID *arbReport /* out */) const override;
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escape_info find_escape_strings(dstate_id_t this_idx) const override;
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size_t accelSize(void) const override;
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void buildAccel(dstate_id_t this_idx,const escape_info &info,
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void *accel_out) override;
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virtual u32 max_allowed_offset_accel() const;
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private:
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raw_dfa &rdfa;
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};
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/* accel_states: (optional) on success, is filled with the set of accelerable
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* states */
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ue2::aligned_unique_ptr<NFA>
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mcclellanCompile(raw_dfa &raw, const CompileContext &cc,
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std::set<dstate_id_t> *accel_states = nullptr);
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/* used internally by mcclellan/haig/gough compile process */
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ue2::aligned_unique_ptr<NFA>
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mcclellanCompile_i(raw_dfa &raw, dfa_build_strat &strat,
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const CompileContext &cc,
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std::set<dstate_id_t> *accel_states = nullptr);
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/**
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* \brief Returns the width of the character reach at start.
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*/
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u32 mcclellanStartReachSize(const raw_dfa *raw);
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std::set<ReportID> all_reports(const raw_dfa &rdfa);
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bool has_accel_dfa(const NFA *nfa);
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} // namespace ue2
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#endif
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