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/*
* Copyright (c) 2015-2017, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
* \brief SOM Slot Manager.
*/
#ifndef SLOT_MANAGER_H
#define SLOT_MANAGER_H
#include "ue2common.h"
#include "nfagraph/ng_holder.h"
#include "util/bytecode_ptr.h"
#include "util/noncopyable.h"
#include <deque>
#include <memory>
#include <unordered_map>
struct NFA;
namespace ue2 {
class CharReach;
class NGHolder;
struct Grey;
struct SlotCache;
/** \brief SOM slot manager. Used to hand out SOM slots and track their
* relationships during SOM construction. Also stores reverse NFAs used for
* SOM. */
class SomSlotManager : noncopyable {
public:
explicit SomSlotManager(u8 precision);
~SomSlotManager();
/** \brief Sentinel value used to specify that a slot has no parent. */
static constexpr u32 NO_PARENT = ~0;
u32 getSomSlot(const NGHolder &prefix, const CharReach &escapes,
bool is_reset, u32 parent_slot);
/** prefix must be acting as a resetting sentinel and should be a dag (if
* not how are we establish som?) */
u32 getInitialResetSomSlot(const NGHolder &prefix, const NGHolder &g,
const std::unordered_map<NFAVertex, u32> ®ion_map,
u32 last_sent_region,
bool *prefix_already_implemented);
u32 getPrivateSomSlot(void);
void rollbackSomTo(u32 num);
u32 numSomSlots() const;
const std::deque<bytecode_ptr<NFA>> &getRevNfas() const {
return rev_nfas;
}
u32 addRevNfa(bytecode_ptr<NFA> nfa, u32 maxWidth);
u32 somHistoryRequired() const { return historyRequired; }
u32 somPrecision() const { return precision; }
void somPrecision(u32 p) {
precision = p;
}
private:
u32 nextSomSlot;
std::unique_ptr<SlotCache> cache;
/** \brief Reverse NFAs used for SOM support. */
std::deque<bytecode_ptr<NFA>> rev_nfas;
/** \brief In streaming mode, the amount of history we've committed to
* using for SOM rev NFAs. */
u32 historyRequired;
/** \brief Number of bytes of SOM precision requested by the user, zero if
* not in SOM mode. */
u32 precision;
#ifdef DUMP_SUPPORT
friend void dumpSomSlotManager(const SomSlotManager &ssm, const Grey &grey);
#endif
};
} // namespace ue2
#endif
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